sys/netpfil/pf/pf.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2001 Daniel Hartmeier
   5  * Copyright (c) 2002 - 2008 Henning Brauer
   6  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  *    - Redistributions of source code must retain the above copyright
  14  *      notice, this list of conditions and the following disclaimer.
  15  *    - Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials provided
  18  *      with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * Effort sponsored in part by the Defense Advanced Research Projects
  34  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  35  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  36  *
  37  *      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_bpf.h"
  44 #include "opt_inet.h"
  45 #include "opt_inet6.h"
  46 #include "opt_pf.h"
  47 #include "opt_sctp.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/bus.h>
  51 #include <sys/endian.h>
  52 #include <sys/gsb_crc32.h>
  53 #include <sys/hash.h>
  54 #include <sys/interrupt.h>
  55 #include <sys/kernel.h>
  56 #include <sys/kthread.h>
  57 #include <sys/limits.h>
  58 #include <sys/mbuf.h>
  59 #include <sys/md5.h>
  60 #include <sys/random.h>
  61 #include <sys/refcount.h>
  62 #include <sys/sdt.h>
  63 #include <sys/socket.h>
  64 #include <sys/sysctl.h>
  65 #include <sys/taskqueue.h>
  66 #include <sys/ucred.h>
  67
  68 #include <net/if.h>
  69 #include <net/if_var.h>
  70 #include <net/if_types.h>
  71 #include <net/if_vlan_var.h>
  72 #include <net/route.h>
  73 #include <net/route/nhop.h>
  74 #include <net/vnet.h>
  75
  76 #include <net/pfil.h>
  77 #include <net/pfvar.h>
  78 #include <net/if_pflog.h>
  79 #include <net/if_pfsync.h>
  80
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/in_var.h>
  83 #include <netinet/in_fib.h>
  84 #include <netinet/ip.h>
  85 #include <netinet/ip_fw.h>
  86 #include <netinet/ip_icmp.h>
  87 #include <netinet/icmp_var.h>
  88 #include <netinet/ip_var.h>
  89 #include <netinet/tcp.h>
  90 #include <netinet/tcp_fsm.h>
  91 #include <netinet/tcp_seq.h>
  92 #include <netinet/tcp_timer.h>
  93 #include <netinet/tcp_var.h>
  94 #include <netinet/udp.h>
  95 #include <netinet/udp_var.h>
  96
  97 /* dummynet */
  98 #include <netinet/ip_dummynet.h>
  99 #include <netinet/ip_fw.h>
 100 #include <netpfil/ipfw/dn_heap.h>
 101 #include <netpfil/ipfw/ip_fw_private.h>
 102 #include <netpfil/ipfw/ip_dn_private.h>
 103
 104 #ifdef INET6
 105 #include <netinet/ip6.h>
 106 #include <netinet/icmp6.h>
 107 #include <netinet6/nd6.h>
 108 #include <netinet6/ip6_var.h>
 109 #include <netinet6/in6_pcb.h>
 110 #include <netinet6/in6_fib.h>
 111 #include <netinet6/scope6_var.h>
 112 #endif /* INET6 */
 113
 114 #if defined(SCTP) || defined(SCTP_SUPPORT)
 115 #include <netinet/sctp_crc32.h>
 116 #endif
 117
 118 #include <machine/in_cksum.h>
 119 #include <security/mac/mac_framework.h>
 120
 121 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 122
 123 SDT_PROVIDER_DEFINE(pf);
 124 SDT_PROBE_DEFINE4(pf, ip, test, done, "int", "int", "struct pf_krule *",
 125     "struct pf_kstate *");
 126 SDT_PROBE_DEFINE4(pf, ip, test6, done, "int", "int", "struct pf_krule *",
 127     "struct pf_kstate *");
 128 SDT_PROBE_DEFINE5(pf, ip, state, lookup, "struct pfi_kkif *",
 129     "struct pf_state_key_cmp *", "int", "struct pf_pdesc *",
 130     "struct pf_kstate *");
 131
 132 SDT_PROBE_DEFINE3(pf, eth, test_rule, entry, "int", "struct ifnet *",
 133     "struct mbuf *");
 134 SDT_PROBE_DEFINE2(pf, eth, test_rule, test, "int", "struct pf_keth_rule *");
 135 SDT_PROBE_DEFINE3(pf, eth, test_rule, mismatch,
 136     "int", "struct pf_keth_rule *", "char *");
 137 SDT_PROBE_DEFINE2(pf, eth, test_rule, match, "int", "struct pf_keth_rule *");
 138 SDT_PROBE_DEFINE2(pf, eth, test_rule, final_match,
 139     "int", "struct pf_keth_rule *");
 140
 141 /*
 142  * Global variables
 143  */
 144
 145 /* state tables */
 146 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[4]);
 147 VNET_DEFINE(struct pf_kpalist,           pf_pabuf);
 148 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 149 VNET_DEFINE(struct pf_altqqueue *,       pf_altq_ifs_active);
 150 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 151 VNET_DEFINE(struct pf_altqqueue *,       pf_altq_ifs_inactive);
 152 VNET_DEFINE(struct pf_kstatus,           pf_status);
 153
 154 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 155 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 156 VNET_DEFINE(int,                         altqs_inactive_open);
 157 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 158
 159 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 160 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 161 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 162 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 163 VNET_DEFINE(int,                         pf_tcp_secret_init);
 164 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 165 VNET_DEFINE(int,                         pf_tcp_iss_off);
 166 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 167 VNET_DECLARE(int,                        pf_vnet_active);
 168 #define V_pf_vnet_active                 VNET(pf_vnet_active)
 169
 170 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx);
 171 #define V_pf_purge_idx  VNET(pf_purge_idx)
 172
 173 #ifdef PF_WANT_32_TO_64_COUNTER
 174 VNET_DEFINE_STATIC(uint32_t, pf_counter_periodic_iter);
 175 #define V_pf_counter_periodic_iter      VNET(pf_counter_periodic_iter)
 176
 177 VNET_DEFINE(struct allrulelist_head, pf_allrulelist);
 178 VNET_DEFINE(size_t, pf_allrulecount);
 179 VNET_DEFINE(struct pf_krule *, pf_rulemarker);
 180 #endif
 181
 182 /*
 183  * Queue for pf_intr() sends.
 184  */
 185 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 186 struct pf_send_entry {
 187         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 188         struct mbuf                     *pfse_m;
 189         enum {
 190                 PFSE_IP,
 191                 PFSE_IP6,
 192                 PFSE_ICMP,
 193                 PFSE_ICMP6,
 194         }                               pfse_type;
 195         struct {
 196                 int             type;
 197                 int             code;
 198                 int             mtu;
 199         } icmpopts;
 200 };
 201
 202 STAILQ_HEAD(pf_send_head, pf_send_entry);
 203 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue);
 204 #define V_pf_sendqueue  VNET(pf_sendqueue)
 205
 206 static struct mtx_padalign pf_sendqueue_mtx;
 207 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
 208 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 209 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 210
 211 /*
 212  * Queue for pf_overload_task() tasks.
 213  */
 214 struct pf_overload_entry {
 215         SLIST_ENTRY(pf_overload_entry)  next;
 216         struct pf_addr                  addr;
 217         sa_family_t                     af;
 218         uint8_t                         dir;
 219         struct pf_krule                 *rule;
 220 };
 221
 222 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 223 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue);
 224 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 225 VNET_DEFINE_STATIC(struct task, pf_overloadtask);
 226 #define V_pf_overloadtask       VNET(pf_overloadtask)
 227
 228 static struct mtx_padalign pf_overloadqueue_mtx;
 229 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
 230     "pf overload/flush queue", MTX_DEF);
 231 #define PF_OVERLOADQ_LOCK()     mtx_lock(&pf_overloadqueue_mtx)
 232 #define PF_OVERLOADQ_UNLOCK()   mtx_unlock(&pf_overloadqueue_mtx)
 233
 234 VNET_DEFINE(struct pf_krulequeue, pf_unlinked_rules);
 235 struct mtx_padalign pf_unlnkdrules_mtx;
 236 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
 237     MTX_DEF);
 238
 239 struct sx pf_config_lock;
 240 SX_SYSINIT(pf_config_lock, &pf_config_lock, "pf config");
 241
 242 struct mtx_padalign pf_table_stats_lock;
 243 MTX_SYSINIT(pf_table_stats_lock, &pf_table_stats_lock, "pf table stats",
 244     MTX_DEF);
 245
 246 VNET_DEFINE_STATIC(uma_zone_t,  pf_sources_z);
 247 #define V_pf_sources_z  VNET(pf_sources_z)
 248 uma_zone_t              pf_mtag_z;
 249 VNET_DEFINE(uma_zone_t,  pf_state_z);
 250 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 251
 252 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 253 #define PFID_CPUBITS    8
 254 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 255 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 256 #define PFID_MAXID      (~PFID_CPUMASK)
 257 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU);
 258
 259 static void              pf_src_tree_remove_state(struct pf_kstate *);
 260 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 261                             u_int32_t);
 262 static void              pf_add_threshold(struct pf_threshold *);
 263 static int               pf_check_threshold(struct pf_threshold *);
 264
 265 static void              pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 266                             u_int16_t *, u_int16_t *, struct pf_addr *,
 267                             u_int16_t, u_int8_t, sa_family_t);
 268 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 269                             struct tcphdr *, struct pf_state_peer *);
 270 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 271                             struct pf_addr *, struct pf_addr *, u_int16_t,
 272                             u_int16_t *, u_int16_t *, u_int16_t *,
 273                             u_int16_t *, u_int8_t, sa_family_t);
 274 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 275                             sa_family_t, struct pf_krule *);
 276 static void              pf_detach_state(struct pf_kstate *);
 277 static int               pf_state_key_attach(struct pf_state_key *,
 278                             struct pf_state_key *, struct pf_kstate *);
 279 static void              pf_state_key_detach(struct pf_kstate *, int);
 280 static int               pf_state_key_ctor(void *, int, void *, int);
 281 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 282 void                     pf_rule_to_actions(struct pf_krule *,
 283                             struct pf_rule_actions *);
 284 static int               pf_test_eth_rule(int, struct pfi_kkif *,
 285                             struct mbuf **);
 286 static int               pf_test_rule(struct pf_krule **, struct pf_kstate **,
 287                             int, struct pfi_kkif *, struct mbuf *, int,
 288                             struct pf_pdesc *, struct pf_krule **,
 289                             struct pf_kruleset **, struct inpcb *);
 290 static int               pf_create_state(struct pf_krule *, struct pf_krule *,
 291                             struct pf_krule *, struct pf_pdesc *,
 292                             struct pf_ksrc_node *, struct pf_state_key *,
 293                             struct pf_state_key *, struct mbuf *, int,
 294                             u_int16_t, u_int16_t, int *, struct pfi_kkif *,
 295                             struct pf_kstate **, int, u_int16_t, u_int16_t,
 296                             int);
 297 static int               pf_test_fragment(struct pf_krule **, int,
 298                             struct pfi_kkif *, struct mbuf *, void *,
 299                             struct pf_pdesc *, struct pf_krule **,
 300                             struct pf_kruleset **);
 301 static int               pf_tcp_track_full(struct pf_kstate **,
 302                             struct pfi_kkif *, struct mbuf *, int,
 303                             struct pf_pdesc *, u_short *, int *);
 304 static int               pf_tcp_track_sloppy(struct pf_kstate **,
 305                             struct pf_pdesc *, u_short *);
 306 static int               pf_test_state_tcp(struct pf_kstate **, int,
 307                             struct pfi_kkif *, struct mbuf *, int,
 308                             void *, struct pf_pdesc *, u_short *);
 309 static int               pf_test_state_udp(struct pf_kstate **, int,
 310                             struct pfi_kkif *, struct mbuf *, int,
 311                             void *, struct pf_pdesc *);
 312 static int               pf_test_state_icmp(struct pf_kstate **, int,
 313                             struct pfi_kkif *, struct mbuf *, int,
 314                             void *, struct pf_pdesc *, u_short *);
 315 static int               pf_test_state_other(struct pf_kstate **, int,
 316                             struct pfi_kkif *, struct mbuf *, struct pf_pdesc *);
 317 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 318                                 int, u_int16_t);
 319 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 320                             u_int8_t, sa_family_t);
 321 static void              pf_print_state_parts(struct pf_kstate *,
 322                             struct pf_state_key *, struct pf_state_key *);
 323 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 324                             struct pf_addr_wrap *);
 325 static void              pf_patch_8(struct mbuf *, u_int16_t *, u_int8_t *, u_int8_t,
 326                             bool, u_int8_t);
 327 static struct pf_kstate *pf_find_state(struct pfi_kkif *,
 328                             struct pf_state_key_cmp *, u_int);
 329 static int               pf_src_connlimit(struct pf_kstate **);
 330 static void              pf_overload_task(void *v, int pending);
 331 static int               pf_insert_src_node(struct pf_ksrc_node **,
 332                             struct pf_krule *, struct pf_addr *, sa_family_t);
 333 static u_int             pf_purge_expired_states(u_int, int);
 334 static void              pf_purge_unlinked_rules(void);
 335 static int               pf_mtag_uminit(void *, int, int);
 336 static void              pf_mtag_free(struct m_tag *);
 337 static void              pf_packet_rework_nat(struct mbuf *, struct pf_pdesc *,
 338                             int, struct pf_state_key *);
 339 #ifdef INET
 340 static void              pf_route(struct mbuf **, struct pf_krule *, int,
 341                             struct ifnet *, struct pf_kstate *,
 342                             struct pf_pdesc *, struct inpcb *);
 343 #endif /* INET */
 344 #ifdef INET6
 345 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 346                             struct pf_addr *, u_int8_t);
 347 static void              pf_route6(struct mbuf **, struct pf_krule *, int,
 348                             struct ifnet *, struct pf_kstate *,
 349                             struct pf_pdesc *, struct inpcb *);
 350 #endif /* INET6 */
 351 static __inline void pf_set_protostate(struct pf_kstate *, int, u_int8_t);
 352
 353 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 354
 355 extern int pf_end_threads;
 356 extern struct proc *pf_purge_proc;
 357
 358 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 359
 360 #define PACKET_UNDO_NAT(_m, _pd, _off, _s, _dir)                \
 361         do {                                                            \
 362                 struct pf_state_key *nk;                                \
 363                 if ((_dir) == PF_OUT)                                   \
 364                         nk = (_s)->key[PF_SK_STACK];                    \
 365                 else                                                    \
 366                         nk = (_s)->key[PF_SK_WIRE];                     \
 367                 pf_packet_rework_nat(_m, _pd, _off, nk);                \
 368         } while (0)
 369
 370 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 371                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 372
 373 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 374         do {                                                            \
 375                 (s) = pf_find_state((i), (k), (d));                     \
 376                 SDT_PROBE5(pf, ip, state, lookup, i, k, d, pd, (s));    \
 377                 if ((s) == NULL)                                        \
 378                         return (PF_DROP);                               \
 379                 if (PACKET_LOOPED(pd))                                  \
 380                         return (PF_PASS);                               \
 381         } while (0)
 382
 383 #define BOUND_IFACE(r, k) \
 384         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 385
 386 #define STATE_INC_COUNTERS(s)                                           \
 387         do {                                                            \
 388                 counter_u64_add(s->rule.ptr->states_cur, 1);            \
 389                 counter_u64_add(s->rule.ptr->states_tot, 1);            \
 390                 if (s->anchor.ptr != NULL) {                            \
 391                         counter_u64_add(s->anchor.ptr->states_cur, 1);  \
 392                         counter_u64_add(s->anchor.ptr->states_tot, 1);  \
 393                 }                                                       \
 394                 if (s->nat_rule.ptr != NULL) {                          \
 395                         counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
 396                         counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
 397                 }                                                       \
 398         } while (0)
 399
 400 #define STATE_DEC_COUNTERS(s)                                           \
 401         do {                                                            \
 402                 if (s->nat_rule.ptr != NULL)                            \
 403                         counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
 404                 if (s->anchor.ptr != NULL)                              \
 405                         counter_u64_add(s->anchor.ptr->states_cur, -1); \
 406                 counter_u64_add(s->rule.ptr->states_cur, -1);           \
 407         } while (0)
 408
 409 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 410 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 411 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 412 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 413
 414 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
 415     "pf(4)");
 416
 417 u_long  pf_hashmask;
 418 u_long  pf_srchashmask;
 419 static u_long   pf_hashsize;
 420 static u_long   pf_srchashsize;
 421 u_long  pf_ioctl_maxcount = 65535;
 422
 423 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 424     &pf_hashsize, 0, "Size of pf(4) states hashtable");
 425 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 426     &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
 427 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RWTUN,
 428     &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call");
 429
 430 VNET_DEFINE(void *, pf_swi_cookie);
 431 VNET_DEFINE(struct intr_event *, pf_swi_ie);
 432
 433 VNET_DEFINE(uint32_t, pf_hashseed);
 434 #define V_pf_hashseed   VNET(pf_hashseed)
 435
 436 #ifdef __LP64__
 437 static int
 438 pf_bcmp_state_key(struct pf_state_key *k1_orig, struct pf_state_key_cmp *k2_orig)
 439 {
 440         unsigned long *k1 = (unsigned long *)k1_orig;
 441         unsigned long *k2 = (unsigned long *)k2_orig;
 442
 443         if (k1[0] != k2[0])
 444                 return (1);
 445
 446         if (k1[1] != k2[1])
 447                 return (1);
 448
 449         if (k1[2] != k2[2])
 450                 return (1);
 451
 452         if (k1[3] != k2[3])
 453                 return (1);
 454
 455         if (k1[4] != k2[4])
 456                 return (1);
 457
 458         return (0);
 459 }
 460 _Static_assert(sizeof(struct pf_state_key_cmp) == 40, "bad size of pf_state_key_cmp");
 461 #else
 462 static inline int
 463 pf_bcmp_state_key(struct pf_state_key *k1_orig, struct pf_state_key_cmp *k2_orig)
 464 {
 465
 466         return (bcmp(k1_orig, k2_orig, sizeof(struct pf_state_key_cmp)));
 467 }
 468 #endif
 469
 470 int
 471 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
 472 {
 473
 474         switch (af) {
 475 #ifdef INET
 476         case AF_INET:
 477                 if (a->addr32[0] > b->addr32[0])
 478                         return (1);
 479                 if (a->addr32[0] < b->addr32[0])
 480                         return (-1);
 481                 break;
 482 #endif /* INET */
 483 #ifdef INET6
 484         case AF_INET6:
 485                 if (a->addr32[3] > b->addr32[3])
 486                         return (1);
 487                 if (a->addr32[3] < b->addr32[3])
 488                         return (-1);
 489                 if (a->addr32[2] > b->addr32[2])
 490                         return (1);
 491                 if (a->addr32[2] < b->addr32[2])
 492                         return (-1);
 493                 if (a->addr32[1] > b->addr32[1])
 494                         return (1);
 495                 if (a->addr32[1] < b->addr32[1])
 496                         return (-1);
 497                 if (a->addr32[0] > b->addr32[0])
 498                         return (1);
 499                 if (a->addr32[0] < b->addr32[0])
 500                         return (-1);
 501                 break;
 502 #endif /* INET6 */
 503         default:
 504                 panic("%s: unknown address family %u", __func__, af);
 505         }
 506         return (0);
 507 }
 508
 509 static void
 510 pf_packet_rework_nat(struct mbuf *m, struct pf_pdesc *pd, int off,
 511         struct pf_state_key *nk)
 512 {
 513
 514         switch (pd->proto) {
 515         case IPPROTO_TCP: {
 516                 struct tcphdr *th = &pd->hdr.tcp;
 517
 518                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af))
 519                         pf_change_ap(m, pd->src, &th->th_sport, pd->ip_sum,
 520                             &th->th_sum, &nk->addr[pd->sidx],
 521                             nk->port[pd->sidx], 0, pd->af);
 522                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af))
 523                         pf_change_ap(m, pd->dst, &th->th_dport, pd->ip_sum,
 524                             &th->th_sum, &nk->addr[pd->didx],
 525                             nk->port[pd->didx], 0, pd->af);
 526                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
 527                 break;
 528         }
 529         case IPPROTO_UDP: {
 530                 struct udphdr *uh = &pd->hdr.udp;
 531
 532                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af))
 533                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
 534                             &uh->uh_sum, &nk->addr[pd->sidx],
 535                             nk->port[pd->sidx], 1, pd->af);
 536                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af))
 537                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
 538                             &uh->uh_sum, &nk->addr[pd->didx],
 539                             nk->port[pd->didx], 1, pd->af);
 540                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
 541                 break;
 542         }
 543         case IPPROTO_ICMP: {
 544                 struct icmp *ih = &pd->hdr.icmp;
 545
 546                 if (nk->port[pd->sidx] != ih->icmp_id) {
 547                         pd->hdr.icmp.icmp_cksum = pf_cksum_fixup(
 548                             ih->icmp_cksum, ih->icmp_id,
 549                             nk->port[pd->sidx], 0);
 550                         ih->icmp_id = nk->port[pd->sidx];
 551                         pd->sport = &ih->icmp_id;
 552
 553                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)ih);
 554                 }
 555                 /* FALLTHROUGH */
 556         }
 557         default:
 558                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af)) {
 559                         switch (pd->af) {
 560                         case AF_INET:
 561                                 pf_change_a(&pd->src->v4.s_addr,
 562                                     pd->ip_sum, nk->addr[pd->sidx].v4.s_addr,
 563                                     0);
 564                                 break;
 565                         case AF_INET6:
 566                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
 567                                 break;
 568                         }
 569                 }
 570                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af)) {
 571                         switch (pd->af) {
 572                         case AF_INET:
 573                                 pf_change_a(&pd->dst->v4.s_addr,
 574                                     pd->ip_sum, nk->addr[pd->didx].v4.s_addr,
 575                                     0);
 576                                 break;
 577                         case AF_INET6:
 578                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
 579                                 break;
 580                         }
 581                 }
 582                 break;
 583         }
 584 }
 585
 586 static __inline uint32_t
 587 pf_hashkey(struct pf_state_key *sk)
 588 {
 589         uint32_t h;
 590
 591         h = murmur3_32_hash32((uint32_t *)sk,
 592             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 593             V_pf_hashseed);
 594
 595         return (h & pf_hashmask);
 596 }
 597
 598 static __inline uint32_t
 599 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 600 {
 601         uint32_t h;
 602
 603         switch (af) {
 604         case AF_INET:
 605                 h = murmur3_32_hash32((uint32_t *)&addr->v4,
 606                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 607                 break;
 608         case AF_INET6:
 609                 h = murmur3_32_hash32((uint32_t *)&addr->v6,
 610                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 611                 break;
 612         default:
 613                 panic("%s: unknown address family %u", __func__, af);
 614         }
 615
 616         return (h & pf_srchashmask);
 617 }
 618
 619 #ifdef ALTQ
 620 static int
 621 pf_state_hash(struct pf_kstate *s)
 622 {
 623         u_int32_t hv = (intptr_t)s / sizeof(*s);
 624
 625         hv ^= crc32(&s->src, sizeof(s->src));
 626         hv ^= crc32(&s->dst, sizeof(s->dst));
 627         if (hv == 0)
 628                 hv = 1;
 629         return (hv);
 630 }
 631 #endif
 632
 633 static __inline void
 634 pf_set_protostate(struct pf_kstate *s, int which, u_int8_t newstate)
 635 {
 636         if (which == PF_PEER_DST || which == PF_PEER_BOTH)
 637                 s->dst.state = newstate;
 638         if (which == PF_PEER_DST)
 639                 return;
 640         if (s->src.state == newstate)
 641                 return;
 642         if (s->creatorid == V_pf_status.hostid &&
 643             s->key[PF_SK_STACK] != NULL &&
 644             s->key[PF_SK_STACK]->proto == IPPROTO_TCP &&
 645             !(TCPS_HAVEESTABLISHED(s->src.state) ||
 646             s->src.state == TCPS_CLOSED) &&
 647             (TCPS_HAVEESTABLISHED(newstate) || newstate == TCPS_CLOSED))
 648                 atomic_add_32(&V_pf_status.states_halfopen, -1);
 649
 650         s->src.state = newstate;
 651 }
 652
 653 #ifdef INET6
 654 void
 655 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 656 {
 657         switch (af) {
 658 #ifdef INET
 659         case AF_INET:
 660                 dst->addr32[0] = src->addr32[0];
 661                 break;
 662 #endif /* INET */
 663         case AF_INET6:
 664                 dst->addr32[0] = src->addr32[0];
 665                 dst->addr32[1] = src->addr32[1];
 666                 dst->addr32[2] = src->addr32[2];
 667                 dst->addr32[3] = src->addr32[3];
 668                 break;
 669         }
 670 }
 671 #endif /* INET6 */
 672
 673 static void
 674 pf_init_threshold(struct pf_threshold *threshold,
 675     u_int32_t limit, u_int32_t seconds)
 676 {
 677         threshold->limit = limit * PF_THRESHOLD_MULT;
 678         threshold->seconds = seconds;
 679         threshold->count = 0;
 680         threshold->last = time_uptime;
 681 }
 682
 683 static void
 684 pf_add_threshold(struct pf_threshold *threshold)
 685 {
 686         u_int32_t t = time_uptime, diff = t - threshold->last;
 687
 688         if (diff >= threshold->seconds)
 689                 threshold->count = 0;
 690         else
 691                 threshold->count -= threshold->count * diff /
 692                     threshold->seconds;
 693         threshold->count += PF_THRESHOLD_MULT;
 694         threshold->last = t;
 695 }
 696
 697 static int
 698 pf_check_threshold(struct pf_threshold *threshold)
 699 {
 700         return (threshold->count > threshold->limit);
 701 }
 702
 703 static int
 704 pf_src_connlimit(struct pf_kstate **state)
 705 {
 706         struct pf_overload_entry *pfoe;
 707         int bad = 0;
 708
 709         PF_STATE_LOCK_ASSERT(*state);
 710
 711         (*state)->src_node->conn++;
 712         (*state)->src.tcp_est = 1;
 713         pf_add_threshold(&(*state)->src_node->conn_rate);
 714
 715         if ((*state)->rule.ptr->max_src_conn &&
 716             (*state)->rule.ptr->max_src_conn <
 717             (*state)->src_node->conn) {
 718                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
 719                 bad++;
 720         }
 721
 722         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 723             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 724                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
 725                 bad++;
 726         }
 727
 728         if (!bad)
 729                 return (0);
 730
 731         /* Kill this state. */
 732         (*state)->timeout = PFTM_PURGE;
 733         pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED);
 734
 735         if ((*state)->rule.ptr->overload_tbl == NULL)
 736                 return (1);
 737
 738         /* Schedule overloading and flushing task. */
 739         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 740         if (pfoe == NULL)
 741                 return (1);     /* too bad :( */
 742
 743         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 744         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 745         pfoe->rule = (*state)->rule.ptr;
 746         pfoe->dir = (*state)->direction;
 747         PF_OVERLOADQ_LOCK();
 748         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 749         PF_OVERLOADQ_UNLOCK();
 750         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 751
 752         return (1);
 753 }
 754
 755 static void
 756 pf_overload_task(void *v, int pending)
 757 {
 758         struct pf_overload_head queue;
 759         struct pfr_addr p;
 760         struct pf_overload_entry *pfoe, *pfoe1;
 761         uint32_t killed = 0;
 762
 763         CURVNET_SET((struct vnet *)v);
 764
 765         PF_OVERLOADQ_LOCK();
 766         queue = V_pf_overloadqueue;
 767         SLIST_INIT(&V_pf_overloadqueue);
 768         PF_OVERLOADQ_UNLOCK();
 769
 770         bzero(&p, sizeof(p));
 771         SLIST_FOREACH(pfoe, &queue, next) {
 772                 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
 773                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 774                         printf("%s: blocking address ", __func__);
 775                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 776                         printf("\n");
 777                 }
 778
 779                 p.pfra_af = pfoe->af;
 780                 switch (pfoe->af) {
 781 #ifdef INET
 782                 case AF_INET:
 783                         p.pfra_net = 32;
 784                         p.pfra_ip4addr = pfoe->addr.v4;
 785                         break;
 786 #endif
 787 #ifdef INET6
 788                 case AF_INET6:
 789                         p.pfra_net = 128;
 790                         p.pfra_ip6addr = pfoe->addr.v6;
 791                         break;
 792 #endif
 793                 }
 794
 795                 PF_RULES_WLOCK();
 796                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 797                 PF_RULES_WUNLOCK();
 798         }
 799
 800         /*
 801          * Remove those entries, that don't need flushing.
 802          */
 803         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 804                 if (pfoe->rule->flush == 0) {
 805                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 806                         free(pfoe, M_PFTEMP);
 807                 } else
 808                         counter_u64_add(
 809                             V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
 810
 811         /* If nothing to flush, return. */
 812         if (SLIST_EMPTY(&queue)) {
 813                 CURVNET_RESTORE();
 814                 return;
 815         }
 816
 817         for (int i = 0; i <= pf_hashmask; i++) {
 818                 struct pf_idhash *ih = &V_pf_idhash[i];
 819                 struct pf_state_key *sk;
 820                 struct pf_kstate *s;
 821
 822                 PF_HASHROW_LOCK(ih);
 823                 LIST_FOREACH(s, &ih->states, entry) {
 824                     sk = s->key[PF_SK_WIRE];
 825                     SLIST_FOREACH(pfoe, &queue, next)
 826                         if (sk->af == pfoe->af &&
 827                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 828                             pfoe->rule == s->rule.ptr) &&
 829                             ((pfoe->dir == PF_OUT &&
 830                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 831                             (pfoe->dir == PF_IN &&
 832                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 833                                 s->timeout = PFTM_PURGE;
 834                                 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED);
 835                                 killed++;
 836                         }
 837                 }
 838                 PF_HASHROW_UNLOCK(ih);
 839         }
 840         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 841                 free(pfoe, M_PFTEMP);
 842         if (V_pf_status.debug >= PF_DEBUG_MISC)
 843                 printf("%s: %u states killed", __func__, killed);
 844
 845         CURVNET_RESTORE();
 846 }
 847
 848 /*
 849  * Can return locked on failure, so that we can consistently
 850  * allocate and insert a new one.
 851  */
 852 struct pf_ksrc_node *
 853 pf_find_src_node(struct pf_addr *src, struct pf_krule *rule, sa_family_t af,
 854         int returnlocked)
 855 {
 856         struct pf_srchash *sh;
 857         struct pf_ksrc_node *n;
 858
 859         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
 860
 861         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 862         PF_HASHROW_LOCK(sh);
 863         LIST_FOREACH(n, &sh->nodes, entry)
 864                 if (n->rule.ptr == rule && n->af == af &&
 865                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 866                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 867                         break;
 868         if (n != NULL) {
 869                 n->states++;
 870                 PF_HASHROW_UNLOCK(sh);
 871         } else if (returnlocked == 0)
 872                 PF_HASHROW_UNLOCK(sh);
 873
 874         return (n);
 875 }
 876
 877 static void
 878 pf_free_src_node(struct pf_ksrc_node *sn)
 879 {
 880
 881         for (int i = 0; i < 2; i++) {
 882                 counter_u64_free(sn->bytes[i]);
 883                 counter_u64_free(sn->packets[i]);
 884         }
 885         uma_zfree(V_pf_sources_z, sn);
 886 }
 887
 888 static int
 889 pf_insert_src_node(struct pf_ksrc_node **sn, struct pf_krule *rule,
 890     struct pf_addr *src, sa_family_t af)
 891 {
 892
 893         KASSERT((rule->rule_flag & PFRULE_SRCTRACK ||
 894             rule->rpool.opts & PF_POOL_STICKYADDR),
 895             ("%s for non-tracking rule %p", __func__, rule));
 896
 897         if (*sn == NULL)
 898                 *sn = pf_find_src_node(src, rule, af, 1);
 899
 900         if (*sn == NULL) {
 901                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 902
 903                 PF_HASHROW_ASSERT(sh);
 904
 905                 if (!rule->max_src_nodes ||
 906                     counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
 907                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 908                 else
 909                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
 910                             1);
 911                 if ((*sn) == NULL) {
 912                         PF_HASHROW_UNLOCK(sh);
 913                         return (-1);
 914                 }
 915
 916                 for (int i = 0; i < 2; i++) {
 917                         (*sn)->bytes[i] = counter_u64_alloc(M_NOWAIT);
 918                         (*sn)->packets[i] = counter_u64_alloc(M_NOWAIT);
 919
 920                         if ((*sn)->bytes[i] == NULL || (*sn)->packets[i] == NULL) {
 921                                 pf_free_src_node(*sn);
 922                                 PF_HASHROW_UNLOCK(sh);
 923                                 return (-1);
 924                         }
 925                 }
 926
 927                 pf_init_threshold(&(*sn)->conn_rate,
 928                     rule->max_src_conn_rate.limit,
 929                     rule->max_src_conn_rate.seconds);
 930
 931                 (*sn)->af = af;
 932                 (*sn)->rule.ptr = rule;
 933                 PF_ACPY(&(*sn)->addr, src, af);
 934                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 935                 (*sn)->creation = time_uptime;
 936                 (*sn)->ruletype = rule->action;
 937                 (*sn)->states = 1;
 938                 if ((*sn)->rule.ptr != NULL)
 939                         counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
 940                 PF_HASHROW_UNLOCK(sh);
 941                 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
 942         } else {
 943                 if (rule->max_src_states &&
 944                     (*sn)->states >= rule->max_src_states) {
 945                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
 946                             1);
 947                         return (-1);
 948                 }
 949         }
 950         return (0);
 951 }
 952
 953 void
 954 pf_unlink_src_node(struct pf_ksrc_node *src)
 955 {
 956
 957         PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]);
 958         LIST_REMOVE(src, entry);
 959         if (src->rule.ptr)
 960                 counter_u64_add(src->rule.ptr->src_nodes, -1);
 961 }
 962
 963 u_int
 964 pf_free_src_nodes(struct pf_ksrc_node_list *head)
 965 {
 966         struct pf_ksrc_node *sn, *tmp;
 967         u_int count = 0;
 968
 969         LIST_FOREACH_SAFE(sn, head, entry, tmp) {
 970                 pf_free_src_node(sn);
 971                 count++;
 972         }
 973
 974         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
 975
 976         return (count);
 977 }
 978
 979 void
 980 pf_mtag_initialize()
 981 {
 982
 983         pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 984             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
 985             UMA_ALIGN_PTR, 0);
 986 }
 987
 988 /* Per-vnet data storage structures initialization. */
 989 void
 990 pf_initialize()
 991 {
 992         struct pf_keyhash       *kh;
 993         struct pf_idhash        *ih;
 994         struct pf_srchash       *sh;
 995         u_int i;
 996
 997         if (pf_hashsize == 0 || !powerof2(pf_hashsize))
 998                 pf_hashsize = PF_HASHSIZ;
 999         if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
1000                 pf_srchashsize = PF_SRCHASHSIZ;
1001
1002         V_pf_hashseed = arc4random();
1003
1004         /* States and state keys storage. */
1005         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_kstate),
1006             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1007         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
1008         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
1009         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
1010
1011         V_pf_state_key_z = uma_zcreate("pf state keys",
1012             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
1013             UMA_ALIGN_PTR, 0);
1014
1015         V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash),
1016             M_PFHASH, M_NOWAIT | M_ZERO);
1017         V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash),
1018             M_PFHASH, M_NOWAIT | M_ZERO);
1019         if (V_pf_keyhash == NULL || V_pf_idhash == NULL) {
1020                 printf("pf: Unable to allocate memory for "
1021                     "state_hashsize %lu.\n", pf_hashsize);
1022
1023                 free(V_pf_keyhash, M_PFHASH);
1024                 free(V_pf_idhash, M_PFHASH);
1025
1026                 pf_hashsize = PF_HASHSIZ;
1027                 V_pf_keyhash = mallocarray(pf_hashsize,
1028                     sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO);
1029                 V_pf_idhash = mallocarray(pf_hashsize,
1030                     sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO);
1031         }
1032
1033         pf_hashmask = pf_hashsize - 1;
1034         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
1035             i++, kh++, ih++) {
1036                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
1037                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
1038         }
1039
1040         /* Source nodes. */
1041         V_pf_sources_z = uma_zcreate("pf source nodes",
1042             sizeof(struct pf_ksrc_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
1043             0);
1044         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
1045         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
1046         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
1047
1048         V_pf_srchash = mallocarray(pf_srchashsize,
1049             sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO);
1050         if (V_pf_srchash == NULL) {
1051                 printf("pf: Unable to allocate memory for "
1052                     "source_hashsize %lu.\n", pf_srchashsize);
1053
1054                 pf_srchashsize = PF_SRCHASHSIZ;
1055                 V_pf_srchash = mallocarray(pf_srchashsize,
1056                     sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO);
1057         }
1058
1059         pf_srchashmask = pf_srchashsize - 1;
1060         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
1061                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
1062
1063         /* ALTQ */
1064         TAILQ_INIT(&V_pf_altqs[0]);
1065         TAILQ_INIT(&V_pf_altqs[1]);
1066         TAILQ_INIT(&V_pf_altqs[2]);
1067         TAILQ_INIT(&V_pf_altqs[3]);
1068         TAILQ_INIT(&V_pf_pabuf);
1069         V_pf_altqs_active = &V_pf_altqs[0];
1070         V_pf_altq_ifs_active = &V_pf_altqs[1];
1071         V_pf_altqs_inactive = &V_pf_altqs[2];
1072         V_pf_altq_ifs_inactive = &V_pf_altqs[3];
1073
1074         /* Send & overload+flush queues. */
1075         STAILQ_INIT(&V_pf_sendqueue);
1076         SLIST_INIT(&V_pf_overloadqueue);
1077         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
1078
1079         /* Unlinked, but may be referenced rules. */
1080         TAILQ_INIT(&V_pf_unlinked_rules);
1081 }
1082
1083 void
1084 pf_mtag_cleanup()
1085 {
1086
1087         uma_zdestroy(pf_mtag_z);
1088 }
1089
1090 void
1091 pf_cleanup()
1092 {
1093         struct pf_keyhash       *kh;
1094         struct pf_idhash        *ih;
1095         struct pf_srchash       *sh;
1096         struct pf_send_entry    *pfse, *next;
1097         u_int i;
1098
1099         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
1100             i++, kh++, ih++) {
1101                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
1102                     __func__));
1103                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
1104                     __func__));
1105                 mtx_destroy(&kh->lock);
1106                 mtx_destroy(&ih->lock);
1107         }
1108         free(V_pf_keyhash, M_PFHASH);
1109         free(V_pf_idhash, M_PFHASH);
1110
1111         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1112                 KASSERT(LIST_EMPTY(&sh->nodes),
1113                     ("%s: source node hash not empty", __func__));
1114                 mtx_destroy(&sh->lock);
1115         }
1116         free(V_pf_srchash, M_PFHASH);
1117
1118         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
1119                 m_freem(pfse->pfse_m);
1120                 free(pfse, M_PFTEMP);
1121         }
1122
1123         uma_zdestroy(V_pf_sources_z);
1124         uma_zdestroy(V_pf_state_z);
1125         uma_zdestroy(V_pf_state_key_z);
1126 }
1127
1128 static int
1129 pf_mtag_uminit(void *mem, int size, int how)
1130 {
1131         struct m_tag *t;
1132
1133         t = (struct m_tag *)mem;
1134         t->m_tag_cookie = MTAG_ABI_COMPAT;
1135         t->m_tag_id = PACKET_TAG_PF;
1136         t->m_tag_len = sizeof(struct pf_mtag);
1137         t->m_tag_free = pf_mtag_free;
1138
1139         return (0);
1140 }
1141
1142 static void
1143 pf_mtag_free(struct m_tag *t)
1144 {
1145
1146         uma_zfree(pf_mtag_z, t);
1147 }
1148
1149 struct pf_mtag *
1150 pf_get_mtag(struct mbuf *m)
1151 {
1152         struct m_tag *mtag;
1153
1154         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
1155                 return ((struct pf_mtag *)(mtag + 1));
1156
1157         mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
1158         if (mtag == NULL)
1159                 return (NULL);
1160         bzero(mtag + 1, sizeof(struct pf_mtag));
1161         m_tag_prepend(m, mtag);
1162
1163         return ((struct pf_mtag *)(mtag + 1));
1164 }
1165
1166 static int
1167 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
1168     struct pf_kstate *s)
1169 {
1170         struct pf_keyhash       *khs, *khw, *kh;
1171         struct pf_state_key     *sk, *cur;
1172         struct pf_kstate        *si, *olds = NULL;
1173         int idx;
1174
1175         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1176         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
1177         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
1178
1179         /*
1180          * We need to lock hash slots of both keys. To avoid deadlock
1181          * we always lock the slot with lower address first. Unlock order
1182          * isn't important.
1183          *
1184          * We also need to lock ID hash slot before dropping key
1185          * locks. On success we return with ID hash slot locked.
1186          */
1187
1188         if (skw == sks) {
1189                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
1190                 PF_HASHROW_LOCK(khs);
1191         } else {
1192                 khs = &V_pf_keyhash[pf_hashkey(sks)];
1193                 khw = &V_pf_keyhash[pf_hashkey(skw)];
1194                 if (khs == khw) {
1195                         PF_HASHROW_LOCK(khs);
1196                 } else if (khs < khw) {
1197                         PF_HASHROW_LOCK(khs);
1198                         PF_HASHROW_LOCK(khw);
1199                 } else {
1200                         PF_HASHROW_LOCK(khw);
1201                         PF_HASHROW_LOCK(khs);
1202                 }
1203         }
1204
1205 #define KEYS_UNLOCK()   do {                    \
1206         if (khs != khw) {                       \
1207                 PF_HASHROW_UNLOCK(khs);         \
1208                 PF_HASHROW_UNLOCK(khw);         \
1209         } else                                  \
1210                 PF_HASHROW_UNLOCK(khs);         \
1211 } while (0)
1212
1213         /*
1214          * First run: start with wire key.
1215          */
1216         sk = skw;
1217         kh = khw;
1218         idx = PF_SK_WIRE;
1219
1220         MPASS(s->lock == NULL);
1221         s->lock = &V_pf_idhash[PF_IDHASH(s)].lock;
1222
1223 keyattach:
1224         LIST_FOREACH(cur, &kh->keys, entry)
1225                 if (pf_bcmp_state_key(cur, (struct pf_state_key_cmp *)sk) == 0)
1226                         break;
1227
1228         if (cur != NULL) {
1229                 /* Key exists. Check for same kif, if none, add to key. */
1230                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
1231                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
1232
1233                         PF_HASHROW_LOCK(ih);
1234                         if (si->kif == s->kif &&
1235                             si->direction == s->direction) {
1236                                 if (sk->proto == IPPROTO_TCP &&
1237                                     si->src.state >= TCPS_FIN_WAIT_2 &&
1238                                     si->dst.state >= TCPS_FIN_WAIT_2) {
1239                                         /*
1240                                          * New state matches an old >FIN_WAIT_2
1241                                          * state. We can't drop key hash locks,
1242                                          * thus we can't unlink it properly.
1243                                          *
1244                                          * As a workaround we drop it into
1245                                          * TCPS_CLOSED state, schedule purge
1246                                          * ASAP and push it into the very end
1247                                          * of the slot TAILQ, so that it won't
1248                                          * conflict with our new state.
1249                                          */
1250                                         pf_set_protostate(si, PF_PEER_BOTH,
1251                                             TCPS_CLOSED);
1252                                         si->timeout = PFTM_PURGE;
1253                                         olds = si;
1254                                 } else {
1255                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
1256                                                 printf("pf: %s key attach "
1257                                                     "failed on %s: ",
1258                                                     (idx == PF_SK_WIRE) ?
1259                                                     "wire" : "stack",
1260                                                     s->kif->pfik_name);
1261                                                 pf_print_state_parts(s,
1262                                                     (idx == PF_SK_WIRE) ?
1263                                                     sk : NULL,
1264                                                     (idx == PF_SK_STACK) ?
1265                                                     sk : NULL);
1266                                                 printf(", existing: ");
1267                                                 pf_print_state_parts(si,
1268                                                     (idx == PF_SK_WIRE) ?
1269                                                     sk : NULL,
1270                                                     (idx == PF_SK_STACK) ?
1271                                                     sk : NULL);
1272                                                 printf("\n");
1273                                         }
1274                                         PF_HASHROW_UNLOCK(ih);
1275                                         KEYS_UNLOCK();
1276                                         uma_zfree(V_pf_state_key_z, sk);
1277                                         if (idx == PF_SK_STACK)
1278                                                 pf_detach_state(s);
1279                                         return (EEXIST); /* collision! */
1280                                 }
1281                         }
1282                         PF_HASHROW_UNLOCK(ih);
1283                 }
1284                 uma_zfree(V_pf_state_key_z, sk);
1285                 s->key[idx] = cur;
1286         } else {
1287                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1288                 s->key[idx] = sk;
1289         }
1290
1291 stateattach:
1292         /* List is sorted, if-bound states before floating. */
1293         if (s->kif == V_pfi_all)
1294                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1295         else
1296                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1297
1298         if (olds) {
1299                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1300                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1301                     key_list[idx]);
1302                 olds = NULL;
1303         }
1304
1305         /*
1306          * Attach done. See how should we (or should not?)
1307          * attach a second key.
1308          */
1309         if (sks == skw) {
1310                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1311                 idx = PF_SK_STACK;
1312                 sks = NULL;
1313                 goto stateattach;
1314         } else if (sks != NULL) {
1315                 /*
1316                  * Continue attaching with stack key.
1317                  */
1318                 sk = sks;
1319                 kh = khs;
1320                 idx = PF_SK_STACK;
1321                 sks = NULL;
1322                 goto keyattach;
1323         }
1324
1325         PF_STATE_LOCK(s);
1326         KEYS_UNLOCK();
1327
1328         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1329             ("%s failure", __func__));
1330
1331         return (0);
1332 #undef  KEYS_UNLOCK
1333 }
1334
1335 static void
1336 pf_detach_state(struct pf_kstate *s)
1337 {
1338         struct pf_state_key *sks = s->key[PF_SK_STACK];
1339         struct pf_keyhash *kh;
1340
1341         if (sks != NULL) {
1342                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1343                 PF_HASHROW_LOCK(kh);
1344                 if (s->key[PF_SK_STACK] != NULL)
1345                         pf_state_key_detach(s, PF_SK_STACK);
1346                 /*
1347                  * If both point to same key, then we are done.
1348                  */
1349                 if (sks == s->key[PF_SK_WIRE]) {
1350                         pf_state_key_detach(s, PF_SK_WIRE);
1351                         PF_HASHROW_UNLOCK(kh);
1352                         return;
1353                 }
1354                 PF_HASHROW_UNLOCK(kh);
1355         }
1356
1357         if (s->key[PF_SK_WIRE] != NULL) {
1358                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1359                 PF_HASHROW_LOCK(kh);
1360                 if (s->key[PF_SK_WIRE] != NULL)
1361                         pf_state_key_detach(s, PF_SK_WIRE);
1362                 PF_HASHROW_UNLOCK(kh);
1363         }
1364 }
1365
1366 static void
1367 pf_state_key_detach(struct pf_kstate *s, int idx)
1368 {
1369         struct pf_state_key *sk = s->key[idx];
1370 #ifdef INVARIANTS
1371         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1372
1373         PF_HASHROW_ASSERT(kh);
1374 #endif
1375         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1376         s->key[idx] = NULL;
1377
1378         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1379                 LIST_REMOVE(sk, entry);
1380                 uma_zfree(V_pf_state_key_z, sk);
1381         }
1382 }
1383
1384 static int
1385 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1386 {
1387         struct pf_state_key *sk = mem;
1388
1389         bzero(sk, sizeof(struct pf_state_key_cmp));
1390         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1391         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1392
1393         return (0);
1394 }
1395
1396 struct pf_state_key *
1397 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1398         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1399 {
1400         struct pf_state_key *sk;
1401
1402         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1403         if (sk == NULL)
1404                 return (NULL);
1405
1406         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1407         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1408         sk->port[pd->sidx] = sport;
1409         sk->port[pd->didx] = dport;
1410         sk->proto = pd->proto;
1411         sk->af = pd->af;
1412
1413         return (sk);
1414 }
1415
1416 struct pf_state_key *
1417 pf_state_key_clone(struct pf_state_key *orig)
1418 {
1419         struct pf_state_key *sk;
1420
1421         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1422         if (sk == NULL)
1423                 return (NULL);
1424
1425         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1426
1427         return (sk);
1428 }
1429
1430 int
1431 pf_state_insert(struct pfi_kkif *kif, struct pfi_kkif *orig_kif,
1432     struct pf_state_key *skw, struct pf_state_key *sks, struct pf_kstate *s)
1433 {
1434         struct pf_idhash *ih;
1435         struct pf_kstate *cur;
1436         int error;
1437
1438         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1439             ("%s: sks not pristine", __func__));
1440         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1441             ("%s: skw not pristine", __func__));
1442         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1443
1444         s->kif = kif;
1445         s->orig_kif = orig_kif;
1446
1447         if (s->id == 0 && s->creatorid == 0) {
1448                 /* XXX: should be atomic, but probability of collision low */
1449                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1450                         V_pf_stateid[curcpu] = 1;
1451                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1452                 s->id = htobe64(s->id);
1453                 s->creatorid = V_pf_status.hostid;
1454         }
1455
1456         /* Returns with ID locked on success. */
1457         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1458                 return (error);
1459
1460         ih = &V_pf_idhash[PF_IDHASH(s)];
1461         PF_HASHROW_ASSERT(ih);
1462         LIST_FOREACH(cur, &ih->states, entry)
1463                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1464                         break;
1465
1466         if (cur != NULL) {
1467                 PF_HASHROW_UNLOCK(ih);
1468                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1469                         printf("pf: state ID collision: "
1470                             "id: %016llx creatorid: %08x\n",
1471                             (unsigned long long)be64toh(s->id),
1472                             ntohl(s->creatorid));
1473                 }
1474                 pf_detach_state(s);
1475                 return (EEXIST);
1476         }
1477         LIST_INSERT_HEAD(&ih->states, s, entry);
1478         /* One for keys, one for ID hash. */
1479         refcount_init(&s->refs, 2);
1480
1481         pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1482         if (V_pfsync_insert_state_ptr != NULL)
1483                 V_pfsync_insert_state_ptr(s);
1484
1485         /* Returns locked. */
1486         return (0);
1487 }
1488
1489 /*
1490  * Find state by ID: returns with locked row on success.
1491  */
1492 struct pf_kstate *
1493 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1494 {
1495         struct pf_idhash *ih;
1496         struct pf_kstate *s;
1497
1498         pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1499
1500         ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1501
1502         PF_HASHROW_LOCK(ih);
1503         LIST_FOREACH(s, &ih->states, entry)
1504                 if (s->id == id && s->creatorid == creatorid)
1505                         break;
1506
1507         if (s == NULL)
1508                 PF_HASHROW_UNLOCK(ih);
1509
1510         return (s);
1511 }
1512
1513 /*
1514  * Find state by key.
1515  * Returns with ID hash slot locked on success.
1516  */
1517 static struct pf_kstate *
1518 pf_find_state(struct pfi_kkif *kif, struct pf_state_key_cmp *key, u_int dir)
1519 {
1520         struct pf_keyhash       *kh;
1521         struct pf_state_key     *sk;
1522         struct pf_kstate        *s;
1523         int idx;
1524
1525         pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1526
1527         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1528
1529         PF_HASHROW_LOCK(kh);
1530         LIST_FOREACH(sk, &kh->keys, entry)
1531                 if (pf_bcmp_state_key(sk, key) == 0)
1532                         break;
1533         if (sk == NULL) {
1534                 PF_HASHROW_UNLOCK(kh);
1535                 return (NULL);
1536         }
1537
1538         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1539
1540         /* List is sorted, if-bound states before floating ones. */
1541         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1542                 if (s->kif == V_pfi_all || s->kif == kif) {
1543                         PF_STATE_LOCK(s);
1544                         PF_HASHROW_UNLOCK(kh);
1545                         if (__predict_false(s->timeout >= PFTM_MAX)) {
1546                                 /*
1547                                  * State is either being processed by
1548                                  * pf_unlink_state() in an other thread, or
1549                                  * is scheduled for immediate expiry.
1550                                  */
1551                                 PF_STATE_UNLOCK(s);
1552                                 return (NULL);
1553                         }
1554                         return (s);
1555                 }
1556         PF_HASHROW_UNLOCK(kh);
1557
1558         return (NULL);
1559 }
1560
1561 /*
1562  * Returns with ID hash slot locked on success.
1563  */
1564 struct pf_kstate *
1565 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1566 {
1567         struct pf_keyhash       *kh;
1568         struct pf_state_key     *sk;
1569         struct pf_kstate        *s, *ret = NULL;
1570         int                      idx, inout = 0;
1571
1572         pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1573
1574         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1575
1576         PF_HASHROW_LOCK(kh);
1577         LIST_FOREACH(sk, &kh->keys, entry)
1578                 if (pf_bcmp_state_key(sk, key) == 0)
1579                         break;
1580         if (sk == NULL) {
1581                 PF_HASHROW_UNLOCK(kh);
1582                 return (NULL);
1583         }
1584         switch (dir) {
1585         case PF_IN:
1586                 idx = PF_SK_WIRE;
1587                 break;
1588         case PF_OUT:
1589                 idx = PF_SK_STACK;
1590                 break;
1591         case PF_INOUT:
1592                 idx = PF_SK_WIRE;
1593                 inout = 1;
1594                 break;
1595         default:
1596                 panic("%s: dir %u", __func__, dir);
1597         }
1598 second_run:
1599         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1600                 if (more == NULL) {
1601                         PF_STATE_LOCK(s);
1602                         PF_HASHROW_UNLOCK(kh);
1603                         return (s);
1604                 }
1605
1606                 if (ret)
1607                         (*more)++;
1608                 else {
1609                         ret = s;
1610                         PF_STATE_LOCK(s);
1611                 }
1612         }
1613         if (inout == 1) {
1614                 inout = 0;
1615                 idx = PF_SK_STACK;
1616                 goto second_run;
1617         }
1618         PF_HASHROW_UNLOCK(kh);
1619
1620         return (ret);
1621 }
1622
1623 /*
1624  * FIXME
1625  * This routine is inefficient -- locks the state only to unlock immediately on
1626  * return.
1627  * It is racy -- after the state is unlocked nothing stops other threads from
1628  * removing it.
1629  */
1630 bool
1631 pf_find_state_all_exists(struct pf_state_key_cmp *key, u_int dir)
1632 {
1633         struct pf_kstate *s;
1634
1635         s = pf_find_state_all(key, dir, NULL);
1636         if (s != NULL) {
1637                 PF_STATE_UNLOCK(s);
1638                 return (true);
1639         }
1640         return (false);
1641 }
1642
1643 /* END state table stuff */
1644
1645 static void
1646 pf_send(struct pf_send_entry *pfse)
1647 {
1648
1649         PF_SENDQ_LOCK();
1650         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1651         PF_SENDQ_UNLOCK();
1652         swi_sched(V_pf_swi_cookie, 0);
1653 }
1654
1655 static bool
1656 pf_isforlocal(struct mbuf *m, int af)
1657 {
1658         switch (af) {
1659 #ifdef INET
1660         case AF_INET: {
1661                 struct ip *ip = mtod(m, struct ip *);
1662
1663                 return (in_localip(ip->ip_dst));
1664         }
1665 #endif
1666 #ifdef INET6
1667         case AF_INET6: {
1668                 struct ip6_hdr *ip6;
1669                 struct in6_ifaddr *ia;
1670                 ip6 = mtod(m, struct ip6_hdr *);
1671                 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
1672                 if (ia == NULL)
1673                         return (false);
1674                 return (! (ia->ia6_flags & IN6_IFF_NOTREADY));
1675         }
1676 #endif
1677         default:
1678                 panic("Unsupported af %d", af);
1679         }
1680
1681         return (false);
1682 }
1683
1684 void
1685 pf_intr(void *v)
1686 {
1687         struct epoch_tracker et;
1688         struct pf_send_head queue;
1689         struct pf_send_entry *pfse, *next;
1690
1691         CURVNET_SET((struct vnet *)v);
1692
1693         PF_SENDQ_LOCK();
1694         queue = V_pf_sendqueue;
1695         STAILQ_INIT(&V_pf_sendqueue);
1696         PF_SENDQ_UNLOCK();
1697
1698         NET_EPOCH_ENTER(et);
1699
1700         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1701                 switch (pfse->pfse_type) {
1702 #ifdef INET
1703                 case PFSE_IP: {
1704                         if (pf_isforlocal(pfse->pfse_m, AF_INET)) {
1705                                 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL;
1706                                 pfse->pfse_m->m_pkthdr.csum_flags |=
1707                                     CSUM_IP_VALID | CSUM_IP_CHECKED;
1708                                 ip_input(pfse->pfse_m);
1709                         } else {
1710                                 ip_output(pfse->pfse_m, NULL, NULL, 0, NULL,
1711                                     NULL);
1712                         }
1713                         break;
1714                 }
1715                 case PFSE_ICMP:
1716                         icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1717                             pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1718                         break;
1719 #endif /* INET */
1720 #ifdef INET6
1721                 case PFSE_IP6:
1722                         if (pf_isforlocal(pfse->pfse_m, AF_INET6)) {
1723                                 pfse->pfse_m->m_flags |= M_SKIP_FIREWALL;
1724                                 ip6_input(pfse->pfse_m);
1725                         } else {
1726                                 ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL,
1727                                     NULL, NULL);
1728                         }
1729                         break;
1730                 case PFSE_ICMP6:
1731                         icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1732                             pfse->icmpopts.code, pfse->icmpopts.mtu);
1733                         break;
1734 #endif /* INET6 */
1735                 default:
1736                         panic("%s: unknown type", __func__);
1737                 }
1738                 free(pfse, M_PFTEMP);
1739         }
1740         NET_EPOCH_EXIT(et);
1741         CURVNET_RESTORE();
1742 }
1743
1744 #define pf_purge_thread_period  (hz / 10)
1745
1746 #ifdef PF_WANT_32_TO_64_COUNTER
1747 static void
1748 pf_status_counter_u64_periodic(void)
1749 {
1750
1751         PF_RULES_RASSERT();
1752
1753         if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 60)) != 0) {
1754                 return;
1755         }
1756
1757         for (int i = 0; i < FCNT_MAX; i++) {
1758                 pf_counter_u64_periodic(&V_pf_status.fcounters[i]);
1759         }
1760 }
1761
1762 static void
1763 pf_kif_counter_u64_periodic(void)
1764 {
1765         struct pfi_kkif *kif;
1766         size_t r, run;
1767
1768         PF_RULES_RASSERT();
1769
1770         if (__predict_false(V_pf_allkifcount == 0)) {
1771                 return;
1772         }
1773
1774         if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) {
1775                 return;
1776         }
1777
1778         run = V_pf_allkifcount / 10;
1779         if (run < 5)
1780                 run = 5;
1781
1782         for (r = 0; r < run; r++) {
1783                 kif = LIST_NEXT(V_pf_kifmarker, pfik_allkiflist);
1784                 if (kif == NULL) {
1785                         LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist);
1786                         LIST_INSERT_HEAD(&V_pf_allkiflist, V_pf_kifmarker, pfik_allkiflist);
1787                         break;
1788                 }
1789
1790                 LIST_REMOVE(V_pf_kifmarker, pfik_allkiflist);
1791                 LIST_INSERT_AFTER(kif, V_pf_kifmarker, pfik_allkiflist);
1792
1793                 for (int i = 0; i < 2; i++) {
1794                         for (int j = 0; j < 2; j++) {
1795                                 for (int k = 0; k < 2; k++) {
1796                                         pf_counter_u64_periodic(&kif->pfik_packets[i][j][k]);
1797                                         pf_counter_u64_periodic(&kif->pfik_bytes[i][j][k]);
1798                                 }
1799                         }
1800                 }
1801         }
1802 }
1803
1804 static void
1805 pf_rule_counter_u64_periodic(void)
1806 {
1807         struct pf_krule *rule;
1808         size_t r, run;
1809
1810         PF_RULES_RASSERT();
1811
1812         if (__predict_false(V_pf_allrulecount == 0)) {
1813                 return;
1814         }
1815
1816         if ((V_pf_counter_periodic_iter % (pf_purge_thread_period * 10 * 300)) != 0) {
1817                 return;
1818         }
1819
1820         run = V_pf_allrulecount / 10;
1821         if (run < 5)
1822                 run = 5;
1823
1824         for (r = 0; r < run; r++) {
1825                 rule = LIST_NEXT(V_pf_rulemarker, allrulelist);
1826                 if (rule == NULL) {
1827                         LIST_REMOVE(V_pf_rulemarker, allrulelist);
1828                         LIST_INSERT_HEAD(&V_pf_allrulelist, V_pf_rulemarker, allrulelist);
1829                         break;
1830                 }
1831
1832                 LIST_REMOVE(V_pf_rulemarker, allrulelist);
1833                 LIST_INSERT_AFTER(rule, V_pf_rulemarker, allrulelist);
1834
1835                 pf_counter_u64_periodic(&rule->evaluations);
1836                 for (int i = 0; i < 2; i++) {
1837                         pf_counter_u64_periodic(&rule->packets[i]);
1838                         pf_counter_u64_periodic(&rule->bytes[i]);
1839                 }
1840         }
1841 }
1842
1843 static void
1844 pf_counter_u64_periodic_main(void)
1845 {
1846         PF_RULES_RLOCK_TRACKER;
1847
1848         V_pf_counter_periodic_iter++;
1849
1850         PF_RULES_RLOCK();
1851         pf_counter_u64_critical_enter();
1852         pf_status_counter_u64_periodic();
1853         pf_kif_counter_u64_periodic();
1854         pf_rule_counter_u64_periodic();
1855         pf_counter_u64_critical_exit();
1856         PF_RULES_RUNLOCK();
1857 }
1858 #else
1859 #define pf_counter_u64_periodic_main()  do { } while (0)
1860 #endif
1861
1862 void
1863 pf_purge_thread(void *unused __unused)
1864 {
1865         VNET_ITERATOR_DECL(vnet_iter);
1866
1867         sx_xlock(&pf_end_lock);
1868         while (pf_end_threads == 0) {
1869                 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", pf_purge_thread_period);
1870
1871                 VNET_LIST_RLOCK();
1872                 VNET_FOREACH(vnet_iter) {
1873                         CURVNET_SET(vnet_iter);
1874
1875                         /* Wait until V_pf_default_rule is initialized. */
1876                         if (V_pf_vnet_active == 0) {
1877                                 CURVNET_RESTORE();
1878                                 continue;
1879                         }
1880
1881                         pf_counter_u64_periodic_main();
1882
1883                         /*
1884                          *  Process 1/interval fraction of the state
1885                          * table every run.
1886                          */
1887                         V_pf_purge_idx =
1888                             pf_purge_expired_states(V_pf_purge_idx, pf_hashmask /
1889                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1890
1891                         /*
1892                          * Purge other expired types every
1893                          * PFTM_INTERVAL seconds.
1894                          */
1895                         if (V_pf_purge_idx == 0) {
1896                                 /*
1897                                  * Order is important:
1898                                  * - states and src nodes reference rules
1899                                  * - states and rules reference kifs
1900                                  */
1901                                 pf_purge_expired_fragments();
1902                                 pf_purge_expired_src_nodes();
1903                                 pf_purge_unlinked_rules();
1904                                 pfi_kkif_purge();
1905                         }
1906                         CURVNET_RESTORE();
1907                 }
1908                 VNET_LIST_RUNLOCK();
1909         }
1910
1911         pf_end_threads++;
1912         sx_xunlock(&pf_end_lock);
1913         kproc_exit(0);
1914 }
1915
1916 void
1917 pf_unload_vnet_purge(void)
1918 {
1919
1920         /*
1921          * To cleanse up all kifs and rules we need
1922          * two runs: first one clears reference flags,
1923          * then pf_purge_expired_states() doesn't
1924          * raise them, and then second run frees.
1925          */
1926         pf_purge_unlinked_rules();
1927         pfi_kkif_purge();
1928
1929         /*
1930          * Now purge everything.
1931          */
1932         pf_purge_expired_states(0, pf_hashmask);
1933         pf_purge_fragments(UINT_MAX);
1934         pf_purge_expired_src_nodes();
1935
1936         /*
1937          * Now all kifs & rules should be unreferenced,
1938          * thus should be successfully freed.
1939          */
1940         pf_purge_unlinked_rules();
1941         pfi_kkif_purge();
1942 }
1943
1944 u_int32_t
1945 pf_state_expires(const struct pf_kstate *state)
1946 {
1947         u_int32_t       timeout;
1948         u_int32_t       start;
1949         u_int32_t       end;
1950         u_int32_t       states;
1951
1952         /* handle all PFTM_* > PFTM_MAX here */
1953         if (state->timeout == PFTM_PURGE)
1954                 return (time_uptime);
1955         KASSERT(state->timeout != PFTM_UNLINKED,
1956             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1957         KASSERT((state->timeout < PFTM_MAX),
1958             ("pf_state_expires: timeout > PFTM_MAX"));
1959         timeout = state->rule.ptr->timeout[state->timeout];
1960         if (!timeout)
1961                 timeout = V_pf_default_rule.timeout[state->timeout];
1962         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1963         if (start && state->rule.ptr != &V_pf_default_rule) {
1964                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1965                 states = counter_u64_fetch(state->rule.ptr->states_cur);
1966         } else {
1967                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1968                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1969                 states = V_pf_status.states;
1970         }
1971         if (end && states > start && start < end) {
1972                 if (states < end) {
1973                         timeout = (u_int64_t)timeout * (end - states) /
1974                             (end - start);
1975                         return (state->expire + timeout);
1976                 }
1977                 else
1978                         return (time_uptime);
1979         }
1980         return (state->expire + timeout);
1981 }
1982
1983 void
1984 pf_purge_expired_src_nodes()
1985 {
1986         struct pf_ksrc_node_list         freelist;
1987         struct pf_srchash       *sh;
1988         struct pf_ksrc_node     *cur, *next;
1989         int i;
1990
1991         LIST_INIT(&freelist);
1992         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1993             PF_HASHROW_LOCK(sh);
1994             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1995                 if (cur->states == 0 && cur->expire <= time_uptime) {
1996                         pf_unlink_src_node(cur);
1997                         LIST_INSERT_HEAD(&freelist, cur, entry);
1998                 } else if (cur->rule.ptr != NULL)
1999                         cur->rule.ptr->rule_ref |= PFRULE_REFS;
2000             PF_HASHROW_UNLOCK(sh);
2001         }
2002
2003         pf_free_src_nodes(&freelist);
2004
2005         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
2006 }
2007
2008 static void
2009 pf_src_tree_remove_state(struct pf_kstate *s)
2010 {
2011         struct pf_ksrc_node *sn;
2012         struct pf_srchash *sh;
2013         uint32_t timeout;
2014
2015         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
2016             s->rule.ptr->timeout[PFTM_SRC_NODE] :
2017             V_pf_default_rule.timeout[PFTM_SRC_NODE];
2018
2019         if (s->src_node != NULL) {
2020                 sn = s->src_node;
2021                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
2022                 PF_HASHROW_LOCK(sh);
2023                 if (s->src.tcp_est)
2024                         --sn->conn;
2025                 if (--sn->states == 0)
2026                         sn->expire = time_uptime + timeout;
2027                 PF_HASHROW_UNLOCK(sh);
2028         }
2029         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
2030                 sn = s->nat_src_node;
2031                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
2032                 PF_HASHROW_LOCK(sh);
2033                 if (--sn->states == 0)
2034                         sn->expire = time_uptime + timeout;
2035                 PF_HASHROW_UNLOCK(sh);
2036         }
2037         s->src_node = s->nat_src_node = NULL;
2038 }
2039
2040 /*
2041  * Unlink and potentilly free a state. Function may be
2042  * called with ID hash row locked, but always returns
2043  * unlocked, since it needs to go through key hash locking.
2044  */
2045 int
2046 pf_unlink_state(struct pf_kstate *s)
2047 {
2048         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
2049
2050         PF_HASHROW_ASSERT(ih);
2051
2052         if (s->timeout == PFTM_UNLINKED) {
2053                 /*
2054                  * State is being processed
2055                  * by pf_unlink_state() in
2056                  * an other thread.
2057                  */
2058                 PF_HASHROW_UNLOCK(ih);
2059                 return (0);     /* XXXGL: undefined actually */
2060         }
2061
2062         if (s->src.state == PF_TCPS_PROXY_DST) {
2063                 /* XXX wire key the right one? */
2064                 pf_send_tcp(s->rule.ptr, s->key[PF_SK_WIRE]->af,
2065                     &s->key[PF_SK_WIRE]->addr[1],
2066                     &s->key[PF_SK_WIRE]->addr[0],
2067                     s->key[PF_SK_WIRE]->port[1],
2068                     s->key[PF_SK_WIRE]->port[0],
2069                     s->src.seqhi, s->src.seqlo + 1,
2070                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag);
2071         }
2072
2073         LIST_REMOVE(s, entry);
2074         pf_src_tree_remove_state(s);
2075
2076         if (V_pfsync_delete_state_ptr != NULL)
2077                 V_pfsync_delete_state_ptr(s);
2078
2079         STATE_DEC_COUNTERS(s);
2080
2081         s->timeout = PFTM_UNLINKED;
2082
2083         /* Ensure we remove it from the list of halfopen states, if needed. */
2084         if (s->key[PF_SK_STACK] != NULL &&
2085             s->key[PF_SK_STACK]->proto == IPPROTO_TCP)
2086                 pf_set_protostate(s, PF_PEER_BOTH, TCPS_CLOSED);
2087
2088         PF_HASHROW_UNLOCK(ih);
2089
2090         pf_detach_state(s);
2091         /* pf_state_insert() initialises refs to 2 */
2092         return (pf_release_staten(s, 2));
2093 }
2094
2095 struct pf_kstate *
2096 pf_alloc_state(int flags)
2097 {
2098
2099         return (uma_zalloc(V_pf_state_z, flags | M_ZERO));
2100 }
2101
2102 void
2103 pf_free_state(struct pf_kstate *cur)
2104 {
2105
2106         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
2107         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
2108             cur->timeout));
2109
2110         pf_normalize_tcp_cleanup(cur);
2111         uma_zfree(V_pf_state_z, cur);
2112         pf_counter_u64_add(&V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
2113 }
2114
2115 /*
2116  * Called only from pf_purge_thread(), thus serialized.
2117  */
2118 static u_int
2119 pf_purge_expired_states(u_int i, int maxcheck)
2120 {
2121         struct pf_idhash *ih;
2122         struct pf_kstate *s;
2123
2124         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2125
2126         /*
2127          * Go through hash and unlink states that expire now.
2128          */
2129         while (maxcheck > 0) {
2130                 ih = &V_pf_idhash[i];
2131
2132                 /* only take the lock if we expect to do work */
2133                 if (!LIST_EMPTY(&ih->states)) {
2134 relock:
2135                         PF_HASHROW_LOCK(ih);
2136                         LIST_FOREACH(s, &ih->states, entry) {
2137                                 if (pf_state_expires(s) <= time_uptime) {
2138                                         V_pf_status.states -=
2139                                             pf_unlink_state(s);
2140                                         goto relock;
2141                                 }
2142                                 s->rule.ptr->rule_ref |= PFRULE_REFS;
2143                                 if (s->nat_rule.ptr != NULL)
2144                                         s->nat_rule.ptr->rule_ref |= PFRULE_REFS;
2145                                 if (s->anchor.ptr != NULL)
2146                                         s->anchor.ptr->rule_ref |= PFRULE_REFS;
2147                                 s->kif->pfik_flags |= PFI_IFLAG_REFS;
2148                                 if (s->rt_kif)
2149                                         s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
2150                         }
2151                         PF_HASHROW_UNLOCK(ih);
2152                 }
2153
2154                 /* Return when we hit end of hash. */
2155                 if (++i > pf_hashmask) {
2156                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2157                         return (0);
2158                 }
2159
2160                 maxcheck--;
2161         }
2162
2163         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
2164
2165         return (i);
2166 }
2167
2168 static void
2169 pf_purge_unlinked_rules()
2170 {
2171         struct pf_krulequeue tmpq;
2172         struct pf_krule *r, *r1;
2173
2174         /*
2175          * If we have overloading task pending, then we'd
2176          * better skip purging this time. There is a tiny
2177          * probability that overloading task references
2178          * an already unlinked rule.
2179          */
2180         PF_OVERLOADQ_LOCK();
2181         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
2182                 PF_OVERLOADQ_UNLOCK();
2183                 return;
2184         }
2185         PF_OVERLOADQ_UNLOCK();
2186
2187         /*
2188          * Do naive mark-and-sweep garbage collecting of old rules.
2189          * Reference flag is raised by pf_purge_expired_states()
2190          * and pf_purge_expired_src_nodes().
2191          *
2192          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
2193          * use a temporary queue.
2194          */
2195         TAILQ_INIT(&tmpq);
2196         PF_UNLNKDRULES_LOCK();
2197         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
2198                 if (!(r->rule_ref & PFRULE_REFS)) {
2199                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
2200                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
2201                 } else
2202                         r->rule_ref &= ~PFRULE_REFS;
2203         }
2204         PF_UNLNKDRULES_UNLOCK();
2205
2206         if (!TAILQ_EMPTY(&tmpq)) {
2207                 PF_CONFIG_LOCK();
2208                 PF_RULES_WLOCK();
2209                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
2210                         TAILQ_REMOVE(&tmpq, r, entries);
2211                         pf_free_rule(r);
2212                 }
2213                 PF_RULES_WUNLOCK();
2214                 PF_CONFIG_UNLOCK();
2215         }
2216 }
2217
2218 void
2219 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
2220 {
2221         switch (af) {
2222 #ifdef INET
2223         case AF_INET: {
2224                 u_int32_t a = ntohl(addr->addr32[0]);
2225                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
2226                     (a>>8)&255, a&255);
2227                 if (p) {
2228                         p = ntohs(p);
2229                         printf(":%u", p);
2230                 }
2231                 break;
2232         }
2233 #endif /* INET */
2234 #ifdef INET6
2235         case AF_INET6: {
2236                 u_int16_t b;
2237                 u_int8_t i, curstart, curend, maxstart, maxend;
2238                 curstart = curend = maxstart = maxend = 255;
2239                 for (i = 0; i < 8; i++) {
2240                         if (!addr->addr16[i]) {
2241                                 if (curstart == 255)
2242                                         curstart = i;
2243                                 curend = i;
2244                         } else {
2245                                 if ((curend - curstart) >
2246                                     (maxend - maxstart)) {
2247                                         maxstart = curstart;
2248                                         maxend = curend;
2249                                 }
2250                                 curstart = curend = 255;
2251                         }
2252                 }
2253                 if ((curend - curstart) >
2254                     (maxend - maxstart)) {
2255                         maxstart = curstart;
2256                         maxend = curend;
2257                 }
2258                 for (i = 0; i < 8; i++) {
2259                         if (i >= maxstart && i <= maxend) {
2260                                 if (i == 0)
2261                                         printf(":");
2262                                 if (i == maxend)
2263                                         printf(":");
2264                         } else {
2265                                 b = ntohs(addr->addr16[i]);
2266                                 printf("%x", b);
2267                                 if (i < 7)
2268                                         printf(":");
2269                         }
2270                 }
2271                 if (p) {
2272                         p = ntohs(p);
2273                         printf("[%u]", p);
2274                 }
2275                 break;
2276         }
2277 #endif /* INET6 */
2278         }
2279 }
2280
2281 void
2282 pf_print_state(struct pf_kstate *s)
2283 {
2284         pf_print_state_parts(s, NULL, NULL);
2285 }
2286
2287 static void
2288 pf_print_state_parts(struct pf_kstate *s,
2289     struct pf_state_key *skwp, struct pf_state_key *sksp)
2290 {
2291         struct pf_state_key *skw, *sks;
2292         u_int8_t proto, dir;
2293
2294         /* Do our best to fill these, but they're skipped if NULL */
2295         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
2296         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
2297         proto = skw ? skw->proto : (sks ? sks->proto : 0);
2298         dir = s ? s->direction : 0;
2299
2300         switch (proto) {
2301         case IPPROTO_IPV4:
2302                 printf("IPv4");
2303                 break;
2304         case IPPROTO_IPV6:
2305                 printf("IPv6");
2306                 break;
2307         case IPPROTO_TCP:
2308                 printf("TCP");
2309                 break;
2310         case IPPROTO_UDP:
2311                 printf("UDP");
2312                 break;
2313         case IPPROTO_ICMP:
2314                 printf("ICMP");
2315                 break;
2316         case IPPROTO_ICMPV6:
2317                 printf("ICMPv6");
2318                 break;
2319         default:
2320                 printf("%u", proto);
2321                 break;
2322         }
2323         switch (dir) {
2324         case PF_IN:
2325                 printf(" in");
2326                 break;
2327         case PF_OUT:
2328                 printf(" out");
2329                 break;
2330         }
2331         if (skw) {
2332                 printf(" wire: ");
2333                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
2334                 printf(" ");
2335                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
2336         }
2337         if (sks) {
2338                 printf(" stack: ");
2339                 if (sks != skw) {
2340                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
2341                         printf(" ");
2342                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
2343                 } else
2344                         printf("-");
2345         }
2346         if (s) {
2347                 if (proto == IPPROTO_TCP) {
2348                         printf(" [lo=%u high=%u win=%u modulator=%u",
2349                             s->src.seqlo, s->src.seqhi,
2350                             s->src.max_win, s->src.seqdiff);
2351                         if (s->src.wscale && s->dst.wscale)
2352                                 printf(" wscale=%u",
2353                                     s->src.wscale & PF_WSCALE_MASK);
2354                         printf("]");
2355                         printf(" [lo=%u high=%u win=%u modulator=%u",
2356                             s->dst.seqlo, s->dst.seqhi,
2357                             s->dst.max_win, s->dst.seqdiff);
2358                         if (s->src.wscale && s->dst.wscale)
2359                                 printf(" wscale=%u",
2360                                 s->dst.wscale & PF_WSCALE_MASK);
2361                         printf("]");
2362                 }
2363                 printf(" %u:%u", s->src.state, s->dst.state);
2364         }
2365 }
2366
2367 void
2368 pf_print_flags(u_int8_t f)
2369 {
2370         if (f)
2371                 printf(" ");
2372         if (f & TH_FIN)
2373                 printf("F");
2374         if (f & TH_SYN)
2375                 printf("S");
2376         if (f & TH_RST)
2377                 printf("R");
2378         if (f & TH_PUSH)
2379                 printf("P");
2380         if (f & TH_ACK)
2381                 printf("A");
2382         if (f & TH_URG)
2383                 printf("U");
2384         if (f & TH_ECE)
2385                 printf("E");
2386         if (f & TH_CWR)
2387                 printf("W");
2388 }
2389
2390 #define PF_SET_SKIP_STEPS(i)                                    \
2391         do {                                                    \
2392                 while (head[i] != cur) {                        \
2393                         head[i]->skip[i].ptr = cur;             \
2394                         head[i] = TAILQ_NEXT(head[i], entries); \
2395                 }                                               \
2396         } while (0)
2397
2398 void
2399 pf_calc_skip_steps(struct pf_krulequeue *rules)
2400 {
2401         struct pf_krule *cur, *prev, *head[PF_SKIP_COUNT];
2402         int i;
2403
2404         cur = TAILQ_FIRST(rules);
2405         prev = cur;
2406         for (i = 0; i < PF_SKIP_COUNT; ++i)
2407                 head[i] = cur;
2408         while (cur != NULL) {
2409                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
2410                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
2411                 if (cur->direction != prev->direction)
2412                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
2413                 if (cur->af != prev->af)
2414                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
2415                 if (cur->proto != prev->proto)
2416                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
2417                 if (cur->src.neg != prev->src.neg ||
2418                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
2419                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
2420                 if (cur->src.port[0] != prev->src.port[0] ||
2421                     cur->src.port[1] != prev->src.port[1] ||
2422                     cur->src.port_op != prev->src.port_op)
2423                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
2424                 if (cur->dst.neg != prev->dst.neg ||
2425                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
2426                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
2427                 if (cur->dst.port[0] != prev->dst.port[0] ||
2428                     cur->dst.port[1] != prev->dst.port[1] ||
2429                     cur->dst.port_op != prev->dst.port_op)
2430                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
2431
2432                 prev = cur;
2433                 cur = TAILQ_NEXT(cur, entries);
2434         }
2435         for (i = 0; i < PF_SKIP_COUNT; ++i)
2436                 PF_SET_SKIP_STEPS(i);
2437 }
2438
2439 static int
2440 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
2441 {
2442         if (aw1->type != aw2->type)
2443                 return (1);
2444         switch (aw1->type) {
2445         case PF_ADDR_ADDRMASK:
2446         case PF_ADDR_RANGE:
2447                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2448                         return (1);
2449                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2450                         return (1);
2451                 return (0);
2452         case PF_ADDR_DYNIFTL:
2453                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2454         case PF_ADDR_NOROUTE:
2455         case PF_ADDR_URPFFAILED:
2456                 return (0);
2457         case PF_ADDR_TABLE:
2458                 return (aw1->p.tbl != aw2->p.tbl);
2459         default:
2460                 printf("invalid address type: %d\n", aw1->type);
2461                 return (1);
2462         }
2463 }
2464
2465 /**
2466  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2467  * header isn't always a full checksum. In some cases (i.e. output) it's a
2468  * pseudo-header checksum, which is a partial checksum over src/dst IP
2469  * addresses, protocol number and length.
2470  *
2471  * That means we have the following cases:
2472  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2473  *      checksums, we need to update the checksum whenever we change anything.
2474  *  * Output (i.e. the checksum is a pseudo-header checksum):
2475  *      x The field being updated is src/dst address or affects the length of
2476  *      the packet. We need to update the pseudo-header checksum (note that this
2477  *      checksum is not ones' complement).
2478  *      x Some other field is being modified (e.g. src/dst port numbers): We
2479  *      don't have to update anything.
2480  **/
2481 u_int16_t
2482 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2483 {
2484         u_int32_t x;
2485
2486         x = cksum + old - new;
2487         x = (x + (x >> 16)) & 0xffff;
2488
2489         /* optimise: eliminate a branch when not udp */
2490         if (udp && cksum == 0x0000)
2491                 return cksum;
2492         if (udp && x == 0x0000)
2493                 x = 0xffff;
2494
2495         return (u_int16_t)(x);
2496 }
2497
2498 static void
2499 pf_patch_8(struct mbuf *m, u_int16_t *cksum, u_int8_t *f, u_int8_t v, bool hi,
2500     u_int8_t udp)
2501 {
2502         u_int16_t old = htons(hi ? (*f << 8) : *f);
2503         u_int16_t new = htons(hi ? ( v << 8) :  v);
2504
2505         if (*f == v)
2506                 return;
2507
2508         *f = v;
2509
2510         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2511                 return;
2512
2513         *cksum = pf_cksum_fixup(*cksum, old, new, udp);
2514 }
2515
2516 void
2517 pf_patch_16_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int16_t v,
2518     bool hi, u_int8_t udp)
2519 {
2520         u_int8_t *fb = (u_int8_t *)f;
2521         u_int8_t *vb = (u_int8_t *)&v;
2522
2523         pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2524         pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2525 }
2526
2527 void
2528 pf_patch_32_unaligned(struct mbuf *m, u_int16_t *cksum, void *f, u_int32_t v,
2529     bool hi, u_int8_t udp)
2530 {
2531         u_int8_t *fb = (u_int8_t *)f;
2532         u_int8_t *vb = (u_int8_t *)&v;
2533
2534         pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2535         pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2536         pf_patch_8(m, cksum, fb++, *vb++, hi, udp);
2537         pf_patch_8(m, cksum, fb++, *vb++, !hi, udp);
2538 }
2539
2540 u_int16_t
2541 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2542         u_int16_t new, u_int8_t udp)
2543 {
2544         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2545                 return (cksum);
2546
2547         return (pf_cksum_fixup(cksum, old, new, udp));
2548 }
2549
2550 static void
2551 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2552         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2553         sa_family_t af)
2554 {
2555         struct pf_addr  ao;
2556         u_int16_t       po = *p;
2557
2558         PF_ACPY(&ao, a, af);
2559         PF_ACPY(a, an, af);
2560
2561         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2562                 *pc = ~*pc;
2563
2564         *p = pn;
2565
2566         switch (af) {
2567 #ifdef INET
2568         case AF_INET:
2569                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2570                     ao.addr16[0], an->addr16[0], 0),
2571                     ao.addr16[1], an->addr16[1], 0);
2572                 *p = pn;
2573
2574                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2575                     ao.addr16[0], an->addr16[0], u),
2576                     ao.addr16[1], an->addr16[1], u);
2577
2578                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2579                 break;
2580 #endif /* INET */
2581 #ifdef INET6
2582         case AF_INET6:
2583                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2584                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2585                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2586                     ao.addr16[0], an->addr16[0], u),
2587                     ao.addr16[1], an->addr16[1], u),
2588                     ao.addr16[2], an->addr16[2], u),
2589                     ao.addr16[3], an->addr16[3], u),
2590                     ao.addr16[4], an->addr16[4], u),
2591                     ao.addr16[5], an->addr16[5], u),
2592                     ao.addr16[6], an->addr16[6], u),
2593                     ao.addr16[7], an->addr16[7], u);
2594
2595                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2596                 break;
2597 #endif /* INET6 */
2598         }
2599
2600         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2601             CSUM_DELAY_DATA_IPV6)) {
2602                 *pc = ~*pc;
2603                 if (! *pc)
2604                         *pc = 0xffff;
2605         }
2606 }
2607
2608 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2609 void
2610 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2611 {
2612         u_int32_t       ao;
2613
2614         memcpy(&ao, a, sizeof(ao));
2615         memcpy(a, &an, sizeof(u_int32_t));
2616         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2617             ao % 65536, an % 65536, u);
2618 }
2619
2620 void
2621 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2622 {
2623         u_int32_t       ao;
2624
2625         memcpy(&ao, a, sizeof(ao));
2626         memcpy(a, &an, sizeof(u_int32_t));
2627
2628         *c = pf_proto_cksum_fixup(m,
2629             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2630             ao % 65536, an % 65536, udp);
2631 }
2632
2633 #ifdef INET6
2634 static void
2635 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2636 {
2637         struct pf_addr  ao;
2638
2639         PF_ACPY(&ao, a, AF_INET6);
2640         PF_ACPY(a, an, AF_INET6);
2641
2642         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2643             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2644             pf_cksum_fixup(pf_cksum_fixup(*c,
2645             ao.addr16[0], an->addr16[0], u),
2646             ao.addr16[1], an->addr16[1], u),
2647             ao.addr16[2], an->addr16[2], u),
2648             ao.addr16[3], an->addr16[3], u),
2649             ao.addr16[4], an->addr16[4], u),
2650             ao.addr16[5], an->addr16[5], u),
2651             ao.addr16[6], an->addr16[6], u),
2652             ao.addr16[7], an->addr16[7], u);
2653 }
2654 #endif /* INET6 */
2655
2656 static void
2657 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2658     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2659     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2660 {
2661         struct pf_addr  oia, ooa;
2662
2663         PF_ACPY(&oia, ia, af);
2664         if (oa)
2665                 PF_ACPY(&ooa, oa, af);
2666
2667         /* Change inner protocol port, fix inner protocol checksum. */
2668         if (ip != NULL) {
2669                 u_int16_t       oip = *ip;
2670                 u_int32_t       opc;
2671
2672                 if (pc != NULL)
2673                         opc = *pc;
2674                 *ip = np;
2675                 if (pc != NULL)
2676                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2677                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2678                 if (pc != NULL)
2679                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2680         }
2681         /* Change inner ip address, fix inner ip and icmp checksums. */
2682         PF_ACPY(ia, na, af);
2683         switch (af) {
2684 #ifdef INET
2685         case AF_INET: {
2686                 u_int32_t        oh2c = *h2c;
2687
2688                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2689                     oia.addr16[0], ia->addr16[0], 0),
2690                     oia.addr16[1], ia->addr16[1], 0);
2691                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2692                     oia.addr16[0], ia->addr16[0], 0),
2693                     oia.addr16[1], ia->addr16[1], 0);
2694                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2695                 break;
2696         }
2697 #endif /* INET */
2698 #ifdef INET6
2699         case AF_INET6:
2700                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2701                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2702                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2703                     oia.addr16[0], ia->addr16[0], u),
2704                     oia.addr16[1], ia->addr16[1], u),
2705                     oia.addr16[2], ia->addr16[2], u),
2706                     oia.addr16[3], ia->addr16[3], u),
2707                     oia.addr16[4], ia->addr16[4], u),
2708                     oia.addr16[5], ia->addr16[5], u),
2709                     oia.addr16[6], ia->addr16[6], u),
2710                     oia.addr16[7], ia->addr16[7], u);
2711                 break;
2712 #endif /* INET6 */
2713         }
2714         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2715         if (oa) {
2716                 PF_ACPY(oa, na, af);
2717                 switch (af) {
2718 #ifdef INET
2719                 case AF_INET:
2720                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2721                             ooa.addr16[0], oa->addr16[0], 0),
2722                             ooa.addr16[1], oa->addr16[1], 0);
2723                         break;
2724 #endif /* INET */
2725 #ifdef INET6
2726                 case AF_INET6:
2727                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2728                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2729                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2730                             ooa.addr16[0], oa->addr16[0], u),
2731                             ooa.addr16[1], oa->addr16[1], u),
2732                             ooa.addr16[2], oa->addr16[2], u),
2733                             ooa.addr16[3], oa->addr16[3], u),
2734                             ooa.addr16[4], oa->addr16[4], u),
2735                             ooa.addr16[5], oa->addr16[5], u),
2736                             ooa.addr16[6], oa->addr16[6], u),
2737                             ooa.addr16[7], oa->addr16[7], u);
2738                         break;
2739 #endif /* INET6 */
2740                 }
2741         }
2742 }
2743
2744 /*
2745  * Need to modulate the sequence numbers in the TCP SACK option
2746  * (credits to Krzysztof Pfaff for report and patch)
2747  */
2748 static int
2749 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2750     struct tcphdr *th, struct pf_state_peer *dst)
2751 {
2752         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2753         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2754         int copyback = 0, i, olen;
2755         struct sackblk sack;
2756
2757 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2758         if (hlen < TCPOLEN_SACKLEN ||
2759             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2760                 return 0;
2761
2762         while (hlen >= TCPOLEN_SACKLEN) {
2763                 size_t startoff = opt - opts;
2764                 olen = opt[1];
2765                 switch (*opt) {
2766                 case TCPOPT_EOL:        /* FALLTHROUGH */
2767                 case TCPOPT_NOP:
2768                         opt++;
2769                         hlen--;
2770                         break;
2771                 case TCPOPT_SACK:
2772                         if (olen > hlen)
2773                                 olen = hlen;
2774                         if (olen >= TCPOLEN_SACKLEN) {
2775                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2776                                     i += TCPOLEN_SACK) {
2777                                         memcpy(&sack, &opt[i], sizeof(sack));
2778                                         pf_patch_32_unaligned(m,
2779                                             &th->th_sum, &sack.start,
2780                                             htonl(ntohl(sack.start) - dst->seqdiff),
2781                                             PF_ALGNMNT(startoff),
2782                                             0);
2783                                         pf_patch_32_unaligned(m, &th->th_sum,
2784                                             &sack.end,
2785                                             htonl(ntohl(sack.end) - dst->seqdiff),
2786                                             PF_ALGNMNT(startoff),
2787                                             0);
2788                                         memcpy(&opt[i], &sack, sizeof(sack));
2789                                 }
2790                                 copyback = 1;
2791                         }
2792                         /* FALLTHROUGH */
2793                 default:
2794                         if (olen < 2)
2795                                 olen = 2;
2796                         hlen -= olen;
2797                         opt += olen;
2798                 }
2799         }
2800
2801         if (copyback)
2802                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2803         return (copyback);
2804 }
2805
2806 struct mbuf *
2807 pf_build_tcp(const struct pf_krule *r, sa_family_t af,
2808     const struct pf_addr *saddr, const struct pf_addr *daddr,
2809     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2810     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2811     u_int16_t rtag)
2812 {
2813         struct mbuf     *m;
2814         int              len, tlen;
2815 #ifdef INET
2816         struct ip       *h = NULL;
2817 #endif /* INET */
2818 #ifdef INET6
2819         struct ip6_hdr  *h6 = NULL;
2820 #endif /* INET6 */
2821         struct tcphdr   *th;
2822         char            *opt;
2823         struct pf_mtag  *pf_mtag;
2824
2825         len = 0;
2826         th = NULL;
2827
2828         /* maximum segment size tcp option */
2829         tlen = sizeof(struct tcphdr);
2830         if (mss)
2831                 tlen += 4;
2832
2833         switch (af) {
2834 #ifdef INET
2835         case AF_INET:
2836                 len = sizeof(struct ip) + tlen;
2837                 break;
2838 #endif /* INET */
2839 #ifdef INET6
2840         case AF_INET6:
2841                 len = sizeof(struct ip6_hdr) + tlen;
2842                 break;
2843 #endif /* INET6 */
2844         default:
2845                 panic("%s: unsupported af %d", __func__, af);
2846         }
2847
2848         m = m_gethdr(M_NOWAIT, MT_DATA);
2849         if (m == NULL)
2850                 return (NULL);
2851
2852 #ifdef MAC
2853         mac_netinet_firewall_send(m);
2854 #endif
2855         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2856                 m_freem(m);
2857                 return (NULL);
2858         }
2859         if (tag)
2860                 m->m_flags |= M_SKIP_FIREWALL;
2861         pf_mtag->tag = rtag;
2862
2863         if (r != NULL && r->rtableid >= 0)
2864                 M_SETFIB(m, r->rtableid);
2865
2866 #ifdef ALTQ
2867         if (r != NULL && r->qid) {
2868                 pf_mtag->qid = r->qid;
2869
2870                 /* add hints for ecn */
2871                 pf_mtag->hdr = mtod(m, struct ip *);
2872         }
2873 #endif /* ALTQ */
2874         m->m_data += max_linkhdr;
2875         m->m_pkthdr.len = m->m_len = len;
2876         /* The rest of the stack assumes a rcvif, so provide one.
2877          * This is a locally generated packet, so .. close enough. */
2878         m->m_pkthdr.rcvif = V_loif;
2879         bzero(m->m_data, len);
2880         switch (af) {
2881 #ifdef INET
2882         case AF_INET:
2883                 h = mtod(m, struct ip *);
2884
2885                 /* IP header fields included in the TCP checksum */
2886                 h->ip_p = IPPROTO_TCP;
2887                 h->ip_len = htons(tlen);
2888                 h->ip_src.s_addr = saddr->v4.s_addr;
2889                 h->ip_dst.s_addr = daddr->v4.s_addr;
2890
2891                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2892                 break;
2893 #endif /* INET */
2894 #ifdef INET6
2895         case AF_INET6:
2896                 h6 = mtod(m, struct ip6_hdr *);
2897
2898                 /* IP header fields included in the TCP checksum */
2899                 h6->ip6_nxt = IPPROTO_TCP;
2900                 h6->ip6_plen = htons(tlen);
2901                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2902                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2903
2904                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2905                 break;
2906 #endif /* INET6 */
2907         }
2908
2909         /* TCP header */
2910         th->th_sport = sport;
2911         th->th_dport = dport;
2912         th->th_seq = htonl(seq);
2913         th->th_ack = htonl(ack);
2914         th->th_off = tlen >> 2;
2915         th->th_flags = flags;
2916         th->th_win = htons(win);
2917
2918         if (mss) {
2919                 opt = (char *)(th + 1);
2920                 opt[0] = TCPOPT_MAXSEG;
2921                 opt[1] = 4;
2922                 HTONS(mss);
2923                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2924         }
2925
2926         switch (af) {
2927 #ifdef INET
2928         case AF_INET:
2929                 /* TCP checksum */
2930                 th->th_sum = in_cksum(m, len);
2931
2932                 /* Finish the IP header */
2933                 h->ip_v = 4;
2934                 h->ip_hl = sizeof(*h) >> 2;
2935                 h->ip_tos = IPTOS_LOWDELAY;
2936                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2937                 h->ip_len = htons(len);
2938                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2939                 h->ip_sum = 0;
2940                 break;
2941 #endif /* INET */
2942 #ifdef INET6
2943         case AF_INET6:
2944                 /* TCP checksum */
2945                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2946                     sizeof(struct ip6_hdr), tlen);
2947
2948                 h6->ip6_vfc |= IPV6_VERSION;
2949                 h6->ip6_hlim = IPV6_DEFHLIM;
2950                 break;
2951 #endif /* INET6 */
2952         }
2953
2954         return (m);
2955 }
2956
2957 void
2958 pf_send_tcp(const struct pf_krule *r, sa_family_t af,
2959     const struct pf_addr *saddr, const struct pf_addr *daddr,
2960     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2961     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2962     u_int16_t rtag)
2963 {
2964         struct pf_send_entry *pfse;
2965         struct mbuf     *m;
2966
2967         m = pf_build_tcp(r, af, saddr, daddr, sport, dport, seq, ack, flags,
2968             win, mss, ttl, tag, rtag);
2969         if (m == NULL)
2970                 return;
2971
2972         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2973         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2974         if (pfse == NULL) {
2975                 m_freem(m);
2976                 return;
2977         }
2978
2979         switch (af) {
2980 #ifdef INET
2981         case AF_INET:
2982                 pfse->pfse_type = PFSE_IP;
2983                 break;
2984 #endif /* INET */
2985 #ifdef INET6
2986         case AF_INET6:
2987                 pfse->pfse_type = PFSE_IP6;
2988                 break;
2989 #endif /* INET6 */
2990         }
2991
2992         pfse->pfse_m = m;
2993         pf_send(pfse);
2994 }
2995
2996 static void
2997 pf_return(struct pf_krule *r, struct pf_krule *nr, struct pf_pdesc *pd,
2998     struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th,
2999     struct pfi_kkif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen,
3000     u_short *reason)
3001 {
3002         struct pf_addr  * const saddr = pd->src;
3003         struct pf_addr  * const daddr = pd->dst;
3004         sa_family_t      af = pd->af;
3005
3006         /* undo NAT changes, if they have taken place */
3007         if (nr != NULL) {
3008                 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3009                 PF_ACPY(daddr, &sk->addr[pd->didx], af);
3010                 if (pd->sport)
3011                         *pd->sport = sk->port[pd->sidx];
3012                 if (pd->dport)
3013                         *pd->dport = sk->port[pd->didx];
3014                 if (pd->proto_sum)
3015                         *pd->proto_sum = bproto_sum;
3016                 if (pd->ip_sum)
3017                         *pd->ip_sum = bip_sum;
3018                 m_copyback(m, off, hdrlen, pd->hdr.any);
3019         }
3020         if (pd->proto == IPPROTO_TCP &&
3021             ((r->rule_flag & PFRULE_RETURNRST) ||
3022             (r->rule_flag & PFRULE_RETURN)) &&
3023             !(th->th_flags & TH_RST)) {
3024                 u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3025                 int              len = 0;
3026 #ifdef INET
3027                 struct ip       *h4;
3028 #endif
3029 #ifdef INET6
3030                 struct ip6_hdr  *h6;
3031 #endif
3032
3033                 switch (af) {
3034 #ifdef INET
3035                 case AF_INET:
3036                         h4 = mtod(m, struct ip *);
3037                         len = ntohs(h4->ip_len) - off;
3038                         break;
3039 #endif
3040 #ifdef INET6
3041                 case AF_INET6:
3042                         h6 = mtod(m, struct ip6_hdr *);
3043                         len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3044                         break;
3045 #endif
3046                 }
3047
3048                 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3049                         REASON_SET(reason, PFRES_PROTCKSUM);
3050                 else {
3051                         if (th->th_flags & TH_SYN)
3052                                 ack++;
3053                         if (th->th_flags & TH_FIN)
3054                                 ack++;
3055                         pf_send_tcp(r, af, pd->dst,
3056                                 pd->src, th->th_dport, th->th_sport,
3057                                 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3058                                 r->return_ttl, 1, 0);
3059                 }
3060         } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3061                 r->return_icmp)
3062                 pf_send_icmp(m, r->return_icmp >> 8,
3063                         r->return_icmp & 255, af, r);
3064         else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3065                 r->return_icmp6)
3066                 pf_send_icmp(m, r->return_icmp6 >> 8,
3067                         r->return_icmp6 & 255, af, r);
3068 }
3069
3070 static int
3071 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
3072 {
3073         struct m_tag *mtag;
3074         u_int8_t mpcp;
3075
3076         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
3077         if (mtag == NULL)
3078                 return (0);
3079
3080         if (prio == PF_PRIO_ZERO)
3081                 prio = 0;
3082
3083         mpcp = *(uint8_t *)(mtag + 1);
3084
3085         return (mpcp == prio);
3086 }
3087
3088 static void
3089 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
3090     struct pf_krule *r)
3091 {
3092         struct pf_send_entry *pfse;
3093         struct mbuf *m0;
3094         struct pf_mtag *pf_mtag;
3095
3096         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
3097         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
3098         if (pfse == NULL)
3099                 return;
3100
3101         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
3102                 free(pfse, M_PFTEMP);
3103                 return;
3104         }
3105
3106         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
3107                 free(pfse, M_PFTEMP);
3108                 return;
3109         }
3110         /* XXX: revisit */
3111         m0->m_flags |= M_SKIP_FIREWALL;
3112
3113         if (r->rtableid >= 0)
3114                 M_SETFIB(m0, r->rtableid);
3115
3116 #ifdef ALTQ
3117         if (r->qid) {
3118                 pf_mtag->qid = r->qid;
3119                 /* add hints for ecn */
3120                 pf_mtag->hdr = mtod(m0, struct ip *);
3121         }
3122 #endif /* ALTQ */
3123
3124         switch (af) {
3125 #ifdef INET
3126         case AF_INET:
3127                 pfse->pfse_type = PFSE_ICMP;
3128                 break;
3129 #endif /* INET */
3130 #ifdef INET6
3131         case AF_INET6:
3132                 pfse->pfse_type = PFSE_ICMP6;
3133                 break;
3134 #endif /* INET6 */
3135         }
3136         pfse->pfse_m = m0;
3137         pfse->icmpopts.type = type;
3138         pfse->icmpopts.code = code;
3139         pf_send(pfse);
3140 }
3141
3142 /*
3143  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
3144  * If n is 0, they match if they are equal. If n is != 0, they match if they
3145  * are different.
3146  */
3147 int
3148 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
3149     struct pf_addr *b, sa_family_t af)
3150 {
3151         int     match = 0;
3152
3153         switch (af) {
3154 #ifdef INET
3155         case AF_INET:
3156                 if ((a->addr32[0] & m->addr32[0]) ==
3157                     (b->addr32[0] & m->addr32[0]))
3158                         match++;
3159                 break;
3160 #endif /* INET */
3161 #ifdef INET6
3162         case AF_INET6:
3163                 if (((a->addr32[0] & m->addr32[0]) ==
3164                      (b->addr32[0] & m->addr32[0])) &&
3165                     ((a->addr32[1] & m->addr32[1]) ==
3166                      (b->addr32[1] & m->addr32[1])) &&
3167                     ((a->addr32[2] & m->addr32[2]) ==
3168                      (b->addr32[2] & m->addr32[2])) &&
3169                     ((a->addr32[3] & m->addr32[3]) ==
3170                      (b->addr32[3] & m->addr32[3])))
3171                         match++;
3172                 break;
3173 #endif /* INET6 */
3174         }
3175         if (match) {
3176                 if (n)
3177                         return (0);
3178                 else
3179                         return (1);
3180         } else {
3181                 if (n)
3182                         return (1);
3183                 else
3184                         return (0);
3185         }
3186 }
3187
3188 /*
3189  * Return 1 if b <= a <= e, otherwise return 0.
3190  */
3191 int
3192 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
3193     struct pf_addr *a, sa_family_t af)
3194 {
3195         switch (af) {
3196 #ifdef INET
3197         case AF_INET:
3198                 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
3199                     (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
3200                         return (0);
3201                 break;
3202 #endif /* INET */
3203 #ifdef INET6
3204         case AF_INET6: {
3205                 int     i;
3206
3207                 /* check a >= b */
3208                 for (i = 0; i < 4; ++i)
3209                         if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
3210                                 break;
3211                         else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
3212                                 return (0);
3213                 /* check a <= e */
3214                 for (i = 0; i < 4; ++i)
3215                         if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
3216                                 break;
3217                         else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
3218                                 return (0);
3219                 break;
3220         }
3221 #endif /* INET6 */
3222         }
3223         return (1);
3224 }
3225
3226 static int
3227 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
3228 {
3229         switch (op) {
3230         case PF_OP_IRG:
3231                 return ((p > a1) && (p < a2));
3232         case PF_OP_XRG:
3233                 return ((p < a1) || (p > a2));
3234         case PF_OP_RRG:
3235                 return ((p >= a1) && (p <= a2));
3236         case PF_OP_EQ:
3237                 return (p == a1);
3238         case PF_OP_NE:
3239                 return (p != a1);
3240         case PF_OP_LT:
3241                 return (p < a1);
3242         case PF_OP_LE:
3243                 return (p <= a1);
3244         case PF_OP_GT:
3245                 return (p > a1);
3246         case PF_OP_GE:
3247                 return (p >= a1);
3248         }
3249         return (0); /* never reached */
3250 }
3251
3252 int
3253 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
3254 {
3255         NTOHS(a1);
3256         NTOHS(a2);
3257         NTOHS(p);
3258         return (pf_match(op, a1, a2, p));
3259 }
3260
3261 static int
3262 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
3263 {
3264         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
3265                 return (0);
3266         return (pf_match(op, a1, a2, u));
3267 }
3268
3269 static int
3270 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
3271 {
3272         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
3273                 return (0);
3274         return (pf_match(op, a1, a2, g));
3275 }
3276
3277 int
3278 pf_match_tag(struct mbuf *m, struct pf_krule *r, int *tag, int mtag)
3279 {
3280         if (*tag == -1)
3281                 *tag = mtag;
3282
3283         return ((!r->match_tag_not && r->match_tag == *tag) ||
3284             (r->match_tag_not && r->match_tag != *tag));
3285 }
3286
3287 int
3288 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
3289 {
3290
3291         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
3292
3293         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
3294                 return (ENOMEM);
3295
3296         pd->pf_mtag->tag = tag;
3297
3298         return (0);
3299 }
3300
3301 #define PF_ANCHOR_STACKSIZE     32
3302 struct pf_kanchor_stackframe {
3303         struct pf_kruleset      *rs;
3304         struct pf_krule         *r;     /* XXX: + match bit */
3305         struct pf_kanchor       *child;
3306 };
3307
3308 /*
3309  * XXX: We rely on malloc(9) returning pointer aligned addresses.
3310  */
3311 #define PF_ANCHORSTACK_MATCH    0x00000001
3312 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
3313
3314 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
3315 #define PF_ANCHOR_RULE(f)       (struct pf_krule *)                     \
3316                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
3317 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
3318                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
3319 } while (0)
3320
3321 void
3322 pf_step_into_anchor(struct pf_kanchor_stackframe *stack, int *depth,
3323     struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a,
3324     int *match)
3325 {
3326         struct pf_kanchor_stackframe    *f;
3327
3328         PF_RULES_RASSERT();
3329
3330         if (match)
3331                 *match = 0;
3332         if (*depth >= PF_ANCHOR_STACKSIZE) {
3333                 printf("%s: anchor stack overflow on %s\n",
3334                     __func__, (*r)->anchor->name);
3335                 *r = TAILQ_NEXT(*r, entries);
3336                 return;
3337         } else if (*depth == 0 && a != NULL)
3338                 *a = *r;
3339         f = stack + (*depth)++;
3340         f->rs = *rs;
3341         f->r = *r;
3342         if ((*r)->anchor_wildcard) {
3343                 struct pf_kanchor_node *parent = &(*r)->anchor->children;
3344
3345                 if ((f->child = RB_MIN(pf_kanchor_node, parent)) == NULL) {
3346                         *r = NULL;
3347                         return;
3348                 }
3349                 *rs = &f->child->ruleset;
3350         } else {
3351                 f->child = NULL;
3352                 *rs = &(*r)->anchor->ruleset;
3353         }
3354         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
3355 }
3356
3357 int
3358 pf_step_out_of_anchor(struct pf_kanchor_stackframe *stack, int *depth,
3359     struct pf_kruleset **rs, int n, struct pf_krule **r, struct pf_krule **a,
3360     int *match)
3361 {
3362         struct pf_kanchor_stackframe    *f;
3363         struct pf_krule *fr;
3364         int quick = 0;
3365
3366         PF_RULES_RASSERT();
3367
3368         do {
3369                 if (*depth <= 0)
3370                         break;
3371                 f = stack + *depth - 1;
3372                 fr = PF_ANCHOR_RULE(f);
3373                 if (f->child != NULL) {
3374                         /*
3375                          * This block traverses through
3376                          * a wildcard anchor.
3377                          */
3378                         if (match != NULL && *match) {
3379                                 /*
3380                                  * If any of "*" matched, then
3381                                  * "foo/ *" matched, mark frame
3382                                  * appropriately.
3383                                  */
3384                                 PF_ANCHOR_SET_MATCH(f);
3385                                 *match = 0;
3386                         }
3387                         f->child = RB_NEXT(pf_kanchor_node,
3388                             &fr->anchor->children, f->child);
3389                         if (f->child != NULL) {
3390                                 *rs = &f->child->ruleset;
3391                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
3392                                 if (*r == NULL)
3393                                         continue;
3394                                 else
3395                                         break;
3396                         }
3397                 }
3398                 (*depth)--;
3399                 if (*depth == 0 && a != NULL)
3400                         *a = NULL;
3401                 *rs = f->rs;
3402                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
3403                         quick = fr->quick;
3404                 *r = TAILQ_NEXT(fr, entries);
3405         } while (*r == NULL);
3406
3407         return (quick);
3408 }
3409
3410 struct pf_keth_anchor_stackframe {
3411         struct pf_keth_ruleset  *rs;
3412         struct pf_keth_rule     *r;     /* XXX: + match bit */
3413         struct pf_keth_anchor   *child;
3414 };
3415
3416 #define PF_ETH_ANCHOR_MATCH(f)  ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
3417 #define PF_ETH_ANCHOR_RULE(f)   (struct pf_keth_rule *)                 \
3418                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
3419 #define PF_ETH_ANCHOR_SET_MATCH(f)      do { (f)->r = (void *)          \
3420                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
3421 } while (0)
3422
3423 void
3424 pf_step_into_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth,
3425     struct pf_keth_ruleset **rs, struct pf_keth_rule **r,
3426     struct pf_keth_rule **a, int *match)
3427 {
3428         struct pf_keth_anchor_stackframe        *f;
3429
3430         NET_EPOCH_ASSERT();
3431
3432         if (match)
3433                 *match = 0;
3434         if (*depth >= PF_ANCHOR_STACKSIZE) {
3435                 printf("%s: anchor stack overflow on %s\n",
3436                     __func__, (*r)->anchor->name);
3437                 *r = TAILQ_NEXT(*r, entries);
3438                 return;
3439         } else if (*depth == 0 && a != NULL)
3440                 *a = *r;
3441         f = stack + (*depth)++;
3442         f->rs = *rs;
3443         f->r = *r;
3444         if ((*r)->anchor_wildcard) {
3445                 struct pf_keth_anchor_node *parent = &(*r)->anchor->children;
3446
3447                 if ((f->child = RB_MIN(pf_keth_anchor_node, parent)) == NULL) {
3448                         *r = NULL;
3449                         return;
3450                 }
3451                 *rs = &f->child->ruleset;
3452         } else {
3453                 f->child = NULL;
3454                 *rs = &(*r)->anchor->ruleset;
3455         }
3456         *r = TAILQ_FIRST((*rs)->active.rules);
3457 }
3458
3459 int
3460 pf_step_out_of_keth_anchor(struct pf_keth_anchor_stackframe *stack, int *depth,
3461     struct pf_keth_ruleset **rs, struct pf_keth_rule **r,
3462     struct pf_keth_rule **a, int *match)
3463 {
3464         struct pf_keth_anchor_stackframe        *f;
3465         struct pf_keth_rule *fr;
3466         int quick = 0;
3467
3468         NET_EPOCH_ASSERT();
3469
3470         do {
3471                 if (*depth <= 0)
3472                         break;
3473                 f = stack + *depth - 1;
3474                 fr = PF_ETH_ANCHOR_RULE(f);
3475                 if (f->child != NULL) {
3476                         /*
3477                          * This block traverses through
3478                          * a wildcard anchor.
3479                          */
3480                         if (match != NULL && *match) {
3481                                 /*
3482                                  * If any of "*" matched, then
3483                                  * "foo/ *" matched, mark frame
3484                                  * appropriately.
3485                                  */
3486                                 PF_ETH_ANCHOR_SET_MATCH(f);
3487                                 *match = 0;
3488                         }
3489                         f->child = RB_NEXT(pf_keth_anchor_node,
3490                             &fr->anchor->children, f->child);
3491                         if (f->child != NULL) {
3492                                 *rs = &f->child->ruleset;
3493                                 *r = TAILQ_FIRST((*rs)->active.rules);
3494                                 if (*r == NULL)
3495                                         continue;
3496                                 else
3497                                         break;
3498                         }
3499                 }
3500                 (*depth)--;
3501                 if (*depth == 0 && a != NULL)
3502                         *a = NULL;
3503                 *rs = f->rs;
3504                 if (PF_ETH_ANCHOR_MATCH(f) || (match != NULL && *match))
3505                         quick = fr->quick;
3506                 *r = TAILQ_NEXT(fr, entries);
3507         } while (*r == NULL);
3508
3509         return (quick);
3510 }
3511
3512 #ifdef INET6
3513 void
3514 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
3515     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
3516 {
3517         switch (af) {
3518 #ifdef INET
3519         case AF_INET:
3520                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
3521                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
3522                 break;
3523 #endif /* INET */
3524         case AF_INET6:
3525                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
3526                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
3527                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
3528                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
3529                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
3530                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
3531                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
3532                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
3533                 break;
3534         }
3535 }
3536
3537 void
3538 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
3539 {
3540         switch (af) {
3541 #ifdef INET
3542         case AF_INET:
3543                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
3544                 break;
3545 #endif /* INET */
3546         case AF_INET6:
3547                 if (addr->addr32[3] == 0xffffffff) {
3548                         addr->addr32[3] = 0;
3549                         if (addr->addr32[2] == 0xffffffff) {
3550                                 addr->addr32[2] = 0;
3551                                 if (addr->addr32[1] == 0xffffffff) {
3552                                         addr->addr32[1] = 0;
3553                                         addr->addr32[0] =
3554                                             htonl(ntohl(addr->addr32[0]) + 1);
3555                                 } else
3556                                         addr->addr32[1] =
3557                                             htonl(ntohl(addr->addr32[1]) + 1);
3558                         } else
3559                                 addr->addr32[2] =
3560                                     htonl(ntohl(addr->addr32[2]) + 1);
3561                 } else
3562                         addr->addr32[3] =
3563                             htonl(ntohl(addr->addr32[3]) + 1);
3564                 break;
3565         }
3566 }
3567 #endif /* INET6 */
3568
3569 void
3570 pf_rule_to_actions(struct pf_krule *r, struct pf_rule_actions *a)
3571 {
3572         if (r->qid)
3573                 a->qid = r->qid;
3574         if (r->pqid)
3575                 a->pqid = r->pqid;
3576         if (r->dnpipe)
3577                 a->dnpipe = r->dnpipe;
3578         if (r->dnrpipe)
3579                 a->dnpipe = r->dnrpipe;
3580         if (r->free_flags & PFRULE_DN_IS_PIPE)
3581                 a->flags |= PFRULE_DN_IS_PIPE;
3582 }
3583
3584 int
3585 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
3586 {
3587         struct pf_addr          *saddr, *daddr;
3588         u_int16_t                sport, dport;
3589         struct inpcbinfo        *pi;
3590         struct inpcb            *inp;
3591
3592         pd->lookup.uid = UID_MAX;
3593         pd->lookup.gid = GID_MAX;
3594
3595         switch (pd->proto) {
3596         case IPPROTO_TCP:
3597                 sport = pd->hdr.tcp.th_sport;
3598                 dport = pd->hdr.tcp.th_dport;
3599                 pi = &V_tcbinfo;
3600                 break;
3601         case IPPROTO_UDP:
3602                 sport = pd->hdr.udp.uh_sport;
3603                 dport = pd->hdr.udp.uh_dport;
3604                 pi = &V_udbinfo;
3605                 break;
3606         default:
3607                 return (-1);
3608         }
3609         if (direction == PF_IN) {
3610                 saddr = pd->src;
3611                 daddr = pd->dst;
3612         } else {
3613                 u_int16_t       p;
3614
3615                 p = sport;
3616                 sport = dport;
3617                 dport = p;
3618                 saddr = pd->dst;
3619                 daddr = pd->src;
3620         }
3621         switch (pd->af) {
3622 #ifdef INET
3623         case AF_INET:
3624                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
3625                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3626                 if (inp == NULL) {
3627                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
3628                            daddr->v4, dport, INPLOOKUP_WILDCARD |
3629                            INPLOOKUP_RLOCKPCB, NULL, m);
3630                         if (inp == NULL)
3631                                 return (-1);
3632                 }
3633                 break;
3634 #endif /* INET */
3635 #ifdef INET6
3636         case AF_INET6:
3637                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
3638                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3639                 if (inp == NULL) {
3640                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
3641                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
3642                             INPLOOKUP_RLOCKPCB, NULL, m);
3643                         if (inp == NULL)
3644                                 return (-1);
3645                 }
3646                 break;
3647 #endif /* INET6 */
3648
3649         default:
3650                 return (-1);
3651         }
3652         INP_RLOCK_ASSERT(inp);
3653         pd->lookup.uid = inp->inp_cred->cr_uid;
3654         pd->lookup.gid = inp->inp_cred->cr_groups[0];
3655         INP_RUNLOCK(inp);
3656
3657         return (1);
3658 }
3659
3660 u_int8_t
3661 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3662 {
3663         int              hlen;
3664         u_int8_t         hdr[60];
3665         u_int8_t        *opt, optlen;
3666         u_int8_t         wscale = 0;
3667
3668         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3669         if (hlen <= sizeof(struct tcphdr))
3670                 return (0);
3671         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3672                 return (0);
3673         opt = hdr + sizeof(struct tcphdr);
3674         hlen -= sizeof(struct tcphdr);
3675         while (hlen >= 3) {
3676                 switch (*opt) {
3677                 case TCPOPT_EOL:
3678                 case TCPOPT_NOP:
3679                         ++opt;
3680                         --hlen;
3681                         break;
3682                 case TCPOPT_WINDOW:
3683                         wscale = opt[2];
3684                         if (wscale > TCP_MAX_WINSHIFT)
3685                                 wscale = TCP_MAX_WINSHIFT;
3686                         wscale |= PF_WSCALE_FLAG;
3687                         /* FALLTHROUGH */
3688                 default:
3689                         optlen = opt[1];
3690                         if (optlen < 2)
3691                                 optlen = 2;
3692                         hlen -= optlen;
3693                         opt += optlen;
3694                         break;
3695                 }
3696         }
3697         return (wscale);
3698 }
3699
3700 u_int16_t
3701 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3702 {
3703         int              hlen;
3704         u_int8_t         hdr[60];
3705         u_int8_t        *opt, optlen;
3706         u_int16_t        mss = V_tcp_mssdflt;
3707
3708         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3709         if (hlen <= sizeof(struct tcphdr))
3710                 return (0);
3711         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3712                 return (0);
3713         opt = hdr + sizeof(struct tcphdr);
3714         hlen -= sizeof(struct tcphdr);
3715         while (hlen >= TCPOLEN_MAXSEG) {
3716                 switch (*opt) {
3717                 case TCPOPT_EOL:
3718                 case TCPOPT_NOP:
3719                         ++opt;
3720                         --hlen;
3721                         break;
3722                 case TCPOPT_MAXSEG:
3723                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3724                         NTOHS(mss);
3725                         /* FALLTHROUGH */
3726                 default:
3727                         optlen = opt[1];
3728                         if (optlen < 2)
3729                                 optlen = 2;
3730                         hlen -= optlen;
3731                         opt += optlen;
3732                         break;
3733                 }
3734         }
3735         return (mss);
3736 }
3737
3738 static u_int16_t
3739 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3740 {
3741         struct nhop_object *nh;
3742 #ifdef INET6
3743         struct in6_addr         dst6;
3744         uint32_t                scopeid;
3745 #endif /* INET6 */
3746         int                      hlen = 0;
3747         uint16_t                 mss = 0;
3748
3749         NET_EPOCH_ASSERT();
3750
3751         switch (af) {
3752 #ifdef INET
3753         case AF_INET:
3754                 hlen = sizeof(struct ip);
3755                 nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0);
3756                 if (nh != NULL)
3757                         mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
3758                 break;
3759 #endif /* INET */
3760 #ifdef INET6
3761         case AF_INET6:
3762                 hlen = sizeof(struct ip6_hdr);
3763                 in6_splitscope(&addr->v6, &dst6, &scopeid);
3764                 nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0);
3765                 if (nh != NULL)
3766                         mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
3767                 break;
3768 #endif /* INET6 */
3769         }
3770
3771         mss = max(V_tcp_mssdflt, mss);
3772         mss = min(mss, offer);
3773         mss = max(mss, 64);             /* sanity - at least max opt space */
3774         return (mss);
3775 }
3776
3777 static u_int32_t
3778 pf_tcp_iss(struct pf_pdesc *pd)
3779 {
3780         MD5_CTX ctx;
3781         u_int32_t digest[4];
3782
3783         if (V_pf_tcp_secret_init == 0) {
3784                 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3785                 MD5Init(&V_pf_tcp_secret_ctx);
3786                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3787                     sizeof(V_pf_tcp_secret));
3788                 V_pf_tcp_secret_init = 1;
3789         }
3790
3791         ctx = V_pf_tcp_secret_ctx;
3792
3793         MD5Update(&ctx, (char *)&pd->hdr.tcp.th_sport, sizeof(u_short));
3794         MD5Update(&ctx, (char *)&pd->hdr.tcp.th_dport, sizeof(u_short));
3795         if (pd->af == AF_INET6) {
3796                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3797                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3798         } else {
3799                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3800                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3801         }
3802         MD5Final((u_char *)digest, &ctx);
3803         V_pf_tcp_iss_off += 4096;
3804 #define ISN_RANDOM_INCREMENT (4096 - 1)
3805         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3806             V_pf_tcp_iss_off);
3807 #undef  ISN_RANDOM_INCREMENT
3808 }
3809
3810 static bool
3811 pf_match_eth_addr(const uint8_t *a, const struct pf_keth_rule_addr *r)
3812 {
3813         bool match = true;
3814
3815         /* Always matches if not set */
3816         if (! r->isset)
3817                 return (!r->neg);
3818
3819         for (int i = 0; i < ETHER_ADDR_LEN; i++) {
3820                 if ((a[i] & r->mask[i]) != (r->addr[i] & r->mask[i])) {
3821                         match = false;
3822                         break;
3823                 }
3824         }
3825
3826         return (match ^ r->neg);
3827 }
3828
3829 static int
3830 pf_test_eth_rule(int dir, struct pfi_kkif *kif, struct mbuf **m0)
3831 {
3832         struct mbuf *m = *m0;
3833         struct ether_header *e;
3834         struct pf_keth_rule *r, *rm, *a = NULL;
3835         struct pf_keth_ruleset *ruleset = NULL;
3836         struct pf_mtag *mtag;
3837         struct pf_keth_ruleq *rules;
3838         struct pf_addr *src, *dst;
3839         sa_family_t af = 0;
3840         uint16_t proto;
3841         int asd = 0, match = 0;
3842         uint8_t action;
3843         struct pf_keth_anchor_stackframe        anchor_stack[PF_ANCHOR_STACKSIZE];
3844
3845         MPASS(kif->pfik_ifp->if_vnet == curvnet);
3846         NET_EPOCH_ASSERT();
3847
3848         PF_RULES_RLOCK_TRACKER;
3849
3850         SDT_PROBE3(pf, eth, test_rule, entry, dir, kif->pfik_ifp, m);
3851
3852         ruleset = V_pf_keth;
3853         rules = ck_pr_load_ptr(&ruleset->active.rules);
3854         r = TAILQ_FIRST(rules);
3855         rm = NULL;
3856
3857         e = mtod(m, struct ether_header *);
3858         proto = ntohs(e->ether_type);
3859
3860         switch (proto) {
3861 #ifdef INET
3862         case ETHERTYPE_IP: {
3863                 struct ip *ip;
3864                 m = m_pullup(m, sizeof(struct ether_header) +
3865                     sizeof(struct ip));
3866                 if (m == NULL) {
3867                         *m0 = NULL;
3868                         return (PF_DROP);
3869                 }
3870                 af = AF_INET;
3871                 ip = mtodo(m, sizeof(struct ether_header));
3872                 src = (struct pf_addr *)&ip->ip_src;
3873                 dst = (struct pf_addr *)&ip->ip_dst;
3874                 break;
3875         }
3876 #endif /* INET */
3877 #ifdef INET6
3878         case ETHERTYPE_IPV6: {
3879                 struct ip6_hdr *ip6;
3880                 m = m_pullup(m, sizeof(struct ether_header) +
3881                     sizeof(struct ip6_hdr));
3882                 if (m == NULL) {
3883                         *m0 = NULL;
3884                         return (PF_DROP);
3885                 }
3886                 af = AF_INET6;
3887                 ip6 = mtodo(m, sizeof(struct ether_header));
3888                 src = (struct pf_addr *)&ip6->ip6_src;
3889                 dst = (struct pf_addr *)&ip6->ip6_dst;
3890                 break;
3891         }
3892 #endif /* INET6 */
3893         }
3894         e = mtod(m, struct ether_header *);
3895         *m0 = m;
3896
3897         PF_RULES_RLOCK();
3898
3899         while (r != NULL) {
3900                 counter_u64_add(r->evaluations, 1);
3901                 SDT_PROBE2(pf, eth, test_rule, test, r->nr, r);
3902
3903                 if (pfi_kkif_match(r->kif, kif) == r->ifnot) {
3904                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3905                             "kif");
3906                         r = r->skip[PFE_SKIP_IFP].ptr;
3907                 }
3908                 else if (r->direction && r->direction != dir) {
3909                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3910                             "dir");
3911                         r = r->skip[PFE_SKIP_DIR].ptr;
3912                 }
3913                 else if (r->proto && r->proto != proto) {
3914                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3915                             "proto");
3916                         r = r->skip[PFE_SKIP_PROTO].ptr;
3917                 }
3918                 else if (! pf_match_eth_addr(e->ether_shost, &r->src)) {
3919                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3920                             "src");
3921                         r = r->skip[PFE_SKIP_SRC_ADDR].ptr;
3922                 }
3923                 else if (! pf_match_eth_addr(e->ether_dhost, &r->dst)) {
3924                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3925                             "dst");
3926                         r = TAILQ_NEXT(r, entries);
3927                 }
3928                 else if (af != 0 && PF_MISMATCHAW(&r->ipsrc.addr, src, af,
3929                     r->ipsrc.neg, kif, M_GETFIB(m))) {
3930                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3931                             "ip_src");
3932                         r = TAILQ_NEXT(r, entries);
3933                 }
3934                 else if (af != 0 && PF_MISMATCHAW(&r->ipdst.addr, dst, af,
3935                     r->ipdst.neg, kif, M_GETFIB(m))) {
3936                         SDT_PROBE3(pf, eth, test_rule, mismatch, r->nr, r,
3937                             "ip_dst");
3938                         r = TAILQ_NEXT(r, entries);
3939                 }
3940                 else {
3941                         if (r->anchor == NULL) {
3942                                 /* Rule matches */
3943                                 rm = r;
3944
3945                                 SDT_PROBE2(pf, eth, test_rule, match, r->nr, r);
3946
3947                                 if (r->quick)
3948                                         break;
3949
3950                                 r = TAILQ_NEXT(r, entries);
3951                         } else {
3952                                 pf_step_into_keth_anchor(anchor_stack, &asd,
3953                                     &ruleset, &r, &a, &match);
3954                         }
3955                 }
3956                 if (r == NULL && pf_step_out_of_keth_anchor(anchor_stack, &asd,
3957                     &ruleset, &r, &a, &match))
3958                         break;
3959         }
3960
3961         r = rm;
3962
3963         SDT_PROBE2(pf, eth, test_rule, final_match, (r != NULL ? r->nr : -1), r);
3964
3965         /* Default to pass. */
3966         if (r == NULL) {
3967                 PF_RULES_RUNLOCK();
3968                 return (PF_PASS);
3969         }
3970
3971         /* Execute action. */
3972         counter_u64_add(r->packets[dir == PF_OUT], 1);
3973         counter_u64_add(r->bytes[dir == PF_OUT], m_length(m, NULL));
3974         pf_update_timestamp(r);
3975
3976         /* Shortcut. Don't tag if we're just going to drop anyway. */
3977         if (r->action == PF_DROP) {
3978                 PF_RULES_RUNLOCK();
3979                 return (PF_DROP);
3980         }
3981
3982         if (r->tag > 0) {
3983                 mtag = pf_get_mtag(m);
3984                 if (mtag == NULL) {
3985                         PF_RULES_RUNLOCK();
3986                         counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
3987                         return (PF_DROP);
3988                 }
3989                 mtag->tag = r->tag;
3990         }
3991
3992         if (r->qid != 0) {
3993                 mtag = pf_get_mtag(m);
3994                 if (mtag == NULL) {
3995                         PF_RULES_RUNLOCK();
3996                         counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
3997                         return (PF_DROP);
3998                 }
3999                 mtag->qid = r->qid;
4000         }
4001
4002         /* Dummynet */
4003         if (r->dnpipe) {
4004                 /** While dummynet supports handling Ethernet packets directly
4005                  * it still wants some L3/L4 information, and we're not set up
4006                  * to provide that here. Instead we'll do what we do for ALTQ
4007                  * and merely mark the packet with the dummynet queue/pipe number.
4008                  **/
4009                 mtag = pf_get_mtag(m);
4010                 if (mtag == NULL) {
4011                         PF_RULES_RUNLOCK();
4012                         counter_u64_add(V_pf_status.counters[PFRES_MEMORY], 1);
4013                         return (PF_DROP);
4014                 }
4015                 mtag->dnpipe = r->dnpipe;
4016                 mtag->dnflags = r->dnflags;
4017         }
4018
4019         action = r->action;
4020
4021         PF_RULES_RUNLOCK();
4022
4023         return (action);
4024 }
4025
4026 static int
4027 pf_test_rule(struct pf_krule **rm, struct pf_kstate **sm, int direction,
4028     struct pfi_kkif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
4029     struct pf_krule **am, struct pf_kruleset **rsm, struct inpcb *inp)
4030 {
4031         struct pf_krule         *nr = NULL;
4032         struct pf_addr          * const saddr = pd->src;
4033         struct pf_addr          * const daddr = pd->dst;
4034         sa_family_t              af = pd->af;
4035         struct pf_krule         *r, *a = NULL;
4036         struct pf_kruleset      *ruleset = NULL;
4037         struct pf_ksrc_node     *nsn = NULL;
4038         struct tcphdr           *th = &pd->hdr.tcp;
4039         struct pf_state_key     *sk = NULL, *nk = NULL;
4040         u_short                  reason;
4041         int                      rewrite = 0, hdrlen = 0;
4042         int                      tag = -1, rtableid = -1;
4043         int                      asd = 0;
4044         int                      match = 0;
4045         int                      state_icmp = 0;
4046         u_int16_t                sport = 0, dport = 0;
4047         u_int16_t                bproto_sum = 0, bip_sum = 0;
4048         u_int8_t                 icmptype = 0, icmpcode = 0;
4049         struct pf_kanchor_stackframe    anchor_stack[PF_ANCHOR_STACKSIZE];
4050
4051         PF_RULES_RASSERT();
4052
4053         if (inp != NULL) {
4054                 INP_LOCK_ASSERT(inp);
4055                 pd->lookup.uid = inp->inp_cred->cr_uid;
4056                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
4057                 pd->lookup.done = 1;
4058         }
4059
4060         switch (pd->proto) {
4061         case IPPROTO_TCP:
4062                 sport = th->th_sport;
4063                 dport = th->th_dport;
4064                 hdrlen = sizeof(*th);
4065                 break;
4066         case IPPROTO_UDP:
4067                 sport = pd->hdr.udp.uh_sport;
4068                 dport = pd->hdr.udp.uh_dport;
4069                 hdrlen = sizeof(pd->hdr.udp);
4070                 break;
4071 #ifdef INET
4072         case IPPROTO_ICMP:
4073                 if (pd->af != AF_INET)
4074                         break;
4075                 sport = dport = pd->hdr.icmp.icmp_id;
4076                 hdrlen = sizeof(pd->hdr.icmp);
4077                 icmptype = pd->hdr.icmp.icmp_type;
4078                 icmpcode = pd->hdr.icmp.icmp_code;
4079
4080                 if (icmptype == ICMP_UNREACH ||
4081                     icmptype == ICMP_SOURCEQUENCH ||
4082                     icmptype == ICMP_REDIRECT ||
4083                     icmptype == ICMP_TIMXCEED ||
4084                     icmptype == ICMP_PARAMPROB)
4085                         state_icmp++;
4086                 break;
4087 #endif /* INET */
4088 #ifdef INET6
4089         case IPPROTO_ICMPV6:
4090                 if (af != AF_INET6)
4091                         break;
4092                 sport = dport = pd->hdr.icmp6.icmp6_id;
4093                 hdrlen = sizeof(pd->hdr.icmp6);
4094                 icmptype = pd->hdr.icmp6.icmp6_type;
4095                 icmpcode = pd->hdr.icmp6.icmp6_code;
4096
4097                 if (icmptype == ICMP6_DST_UNREACH ||
4098                     icmptype == ICMP6_PACKET_TOO_BIG ||
4099                     icmptype == ICMP6_TIME_EXCEEDED ||
4100                     icmptype == ICMP6_PARAM_PROB)
4101                         state_icmp++;
4102                 break;
4103 #endif /* INET6 */
4104         default:
4105                 sport = dport = hdrlen = 0;
4106                 break;
4107         }
4108
4109         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
4110
4111         /* check packet for BINAT/NAT/RDR */
4112         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
4113             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
4114                 KASSERT(sk != NULL, ("%s: null sk", __func__));
4115                 KASSERT(nk != NULL, ("%s: null nk", __func__));
4116
4117                 if (nr->log) {
4118                         PFLOG_PACKET(kif, m, af, direction, PFRES_MATCH, nr, a,
4119                             ruleset, pd, 1);
4120                 }
4121
4122                 if (pd->ip_sum)
4123                         bip_sum = *pd->ip_sum;
4124
4125                 switch (pd->proto) {
4126                 case IPPROTO_TCP:
4127                         bproto_sum = th->th_sum;
4128                         pd->proto_sum = &th->th_sum;
4129
4130                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
4131                             nk->port[pd->sidx] != sport) {
4132                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
4133                                     &th->th_sum, &nk->addr[pd->sidx],
4134                                     nk->port[pd->sidx], 0, af);
4135                                 pd->sport = &th->th_sport;
4136                                 sport = th->th_sport;
4137                         }
4138
4139                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
4140                             nk->port[pd->didx] != dport) {
4141                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
4142                                     &th->th_sum, &nk->addr[pd->didx],
4143                                     nk->port[pd->didx], 0, af);
4144                                 dport = th->th_dport;
4145                                 pd->dport = &th->th_dport;
4146                         }
4147                         rewrite++;
4148                         break;
4149                 case IPPROTO_UDP:
4150                         bproto_sum = pd->hdr.udp.uh_sum;
4151                         pd->proto_sum = &pd->hdr.udp.uh_sum;
4152
4153                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
4154                             nk->port[pd->sidx] != sport) {
4155                                 pf_change_ap(m, saddr, &pd->hdr.udp.uh_sport,
4156                                     pd->ip_sum, &pd->hdr.udp.uh_sum,
4157                                     &nk->addr[pd->sidx],
4158                                     nk->port[pd->sidx], 1, af);
4159                                 sport = pd->hdr.udp.uh_sport;
4160                                 pd->sport = &pd->hdr.udp.uh_sport;
4161                         }
4162
4163                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
4164                             nk->port[pd->didx] != dport) {
4165                                 pf_change_ap(m, daddr, &pd->hdr.udp.uh_dport,
4166                                     pd->ip_sum, &pd->hdr.udp.uh_sum,
4167                                     &nk->addr[pd->didx],
4168                                     nk->port[pd->didx], 1, af);
4169                                 dport = pd->hdr.udp.uh_dport;
4170                                 pd->dport = &pd->hdr.udp.uh_dport;
4171                         }
4172                         rewrite++;
4173                         break;
4174 #ifdef INET
4175                 case IPPROTO_ICMP:
4176                         nk->port[0] = nk->port[1];
4177                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
4178                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
4179                                     nk->addr[pd->sidx].v4.s_addr, 0);
4180
4181                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
4182                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
4183                                     nk->addr[pd->didx].v4.s_addr, 0);
4184
4185                         if (nk->port[1] != pd->hdr.icmp.icmp_id) {
4186                                 pd->hdr.icmp.icmp_cksum = pf_cksum_fixup(
4187                                     pd->hdr.icmp.icmp_cksum, sport,
4188                                     nk->port[1], 0);
4189                                 pd->hdr.icmp.icmp_id = nk->port[1];
4190                                 pd->sport = &pd->hdr.icmp.icmp_id;
4191                         }
4192                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp);
4193                         break;
4194 #endif /* INET */
4195 #ifdef INET6
4196                 case IPPROTO_ICMPV6:
4197                         nk->port[0] = nk->port[1];
4198                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
4199                                 pf_change_a6(saddr, &pd->hdr.icmp6.icmp6_cksum,
4200                                     &nk->addr[pd->sidx], 0);
4201
4202                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
4203                                 pf_change_a6(daddr, &pd->hdr.icmp6.icmp6_cksum,
4204                                     &nk->addr[pd->didx], 0);
4205                         rewrite++;
4206                         break;
4207 #endif /* INET */
4208                 default:
4209                         switch (af) {
4210 #ifdef INET
4211                         case AF_INET:
4212                                 if (PF_ANEQ(saddr,
4213                                     &nk->addr[pd->sidx], AF_INET))
4214                                         pf_change_a(&saddr->v4.s_addr,
4215                                             pd->ip_sum,
4216                                             nk->addr[pd->sidx].v4.s_addr, 0);
4217
4218                                 if (PF_ANEQ(daddr,
4219                                     &nk->addr[pd->didx], AF_INET))
4220                                         pf_change_a(&daddr->v4.s_addr,
4221                                             pd->ip_sum,
4222                                             nk->addr[pd->didx].v4.s_addr, 0);
4223                                 break;
4224 #endif /* INET */
4225 #ifdef INET6
4226                         case AF_INET6:
4227                                 if (PF_ANEQ(saddr,
4228                                     &nk->addr[pd->sidx], AF_INET6))
4229                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
4230
4231                                 if (PF_ANEQ(daddr,
4232                                     &nk->addr[pd->didx], AF_INET6))
4233                                         PF_ACPY(daddr, &nk->addr[pd->didx], af);
4234                                 break;
4235 #endif /* INET */
4236                         }
4237                         break;
4238                 }
4239                 if (nr->natpass)
4240                         r = NULL;
4241                 pd->nat_rule = nr;
4242         }
4243
4244         while (r != NULL) {
4245                 pf_counter_u64_add(&r->evaluations, 1);
4246                 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
4247                         r = r->skip[PF_SKIP_IFP].ptr;
4248                 else if (r->direction && r->direction != direction)
4249                         r = r->skip[PF_SKIP_DIR].ptr;
4250                 else if (r->af && r->af != af)
4251                         r = r->skip[PF_SKIP_AF].ptr;
4252                 else if (r->proto && r->proto != pd->proto)
4253                         r = r->skip[PF_SKIP_PROTO].ptr;
4254                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
4255                     r->src.neg, kif, M_GETFIB(m)))
4256                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4257                 /* tcp/udp only. port_op always 0 in other cases */
4258                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
4259                     r->src.port[0], r->src.port[1], sport))
4260                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
4261                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
4262                     r->dst.neg, NULL, M_GETFIB(m)))
4263                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
4264                 /* tcp/udp only. port_op always 0 in other cases */
4265                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
4266                     r->dst.port[0], r->dst.port[1], dport))
4267                         r = r->skip[PF_SKIP_DST_PORT].ptr;
4268                 /* icmp only. type always 0 in other cases */
4269                 else if (r->type && r->type != icmptype + 1)
4270                         r = TAILQ_NEXT(r, entries);
4271                 /* icmp only. type always 0 in other cases */
4272                 else if (r->code && r->code != icmpcode + 1)
4273                         r = TAILQ_NEXT(r, entries);
4274                 else if (r->tos && !(r->tos == pd->tos))
4275                         r = TAILQ_NEXT(r, entries);
4276                 else if (r->rule_flag & PFRULE_FRAGMENT)
4277                         r = TAILQ_NEXT(r, entries);
4278                 else if (pd->proto == IPPROTO_TCP &&
4279                     (r->flagset & th->th_flags) != r->flags)
4280                         r = TAILQ_NEXT(r, entries);
4281                 /* tcp/udp only. uid.op always 0 in other cases */
4282                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
4283                     pf_socket_lookup(direction, pd, m), 1)) &&
4284                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
4285                     pd->lookup.uid))
4286                         r = TAILQ_NEXT(r, entries);
4287                 /* tcp/udp only. gid.op always 0 in other cases */
4288                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
4289                     pf_socket_lookup(direction, pd, m), 1)) &&
4290                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
4291                     pd->lookup.gid))
4292                         r = TAILQ_NEXT(r, entries);
4293                 else if (r->prio &&
4294                     !pf_match_ieee8021q_pcp(r->prio, m))
4295                         r = TAILQ_NEXT(r, entries);
4296                 else if (r->prob &&
4297                     r->prob <= arc4random())
4298                         r = TAILQ_NEXT(r, entries);
4299                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
4300                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
4301                         r = TAILQ_NEXT(r, entries);
4302                 else if (r->os_fingerprint != PF_OSFP_ANY &&
4303                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
4304                     pf_osfp_fingerprint(pd, m, off, th),
4305                     r->os_fingerprint)))
4306                         r = TAILQ_NEXT(r, entries);
4307                 else {
4308                         if (r->tag)
4309                                 tag = r->tag;
4310                         if (r->rtableid >= 0)
4311                                 rtableid = r->rtableid;
4312                         if (r->anchor == NULL) {
4313                                 if (r->action == PF_MATCH) {
4314                                         pf_counter_u64_critical_enter();
4315                                         pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1);
4316                                         pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len);
4317                                         pf_counter_u64_critical_exit();
4318                                         pf_rule_to_actions(r, &pd->act);
4319                                         if (r->log)
4320                                                 PFLOG_PACKET(kif, m, af,
4321                                                     direction, PFRES_MATCH, r,
4322                                                     a, ruleset, pd, 1);
4323                                 } else {
4324                                         match = 1;
4325                                         *rm = r;
4326                                         *am = a;
4327                                         *rsm = ruleset;
4328                                 }
4329                                 if ((*rm)->quick)
4330                                         break;
4331                                 r = TAILQ_NEXT(r, entries);
4332                         } else
4333                                 pf_step_into_anchor(anchor_stack, &asd,
4334                                     &ruleset, PF_RULESET_FILTER, &r, &a,
4335                                     &match);
4336                 }
4337                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
4338                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
4339                         break;
4340         }
4341         r = *rm;
4342         a = *am;
4343         ruleset = *rsm;
4344
4345         REASON_SET(&reason, PFRES_MATCH);
4346
4347         /* apply actions for last matching pass/block rule */
4348         pf_rule_to_actions(r, &pd->act);
4349
4350         if (r->log) {
4351                 if (rewrite)
4352                         m_copyback(m, off, hdrlen, pd->hdr.any);
4353                 PFLOG_PACKET(kif, m, af, direction, reason, r, a,
4354                     ruleset, pd, 1);
4355         }
4356
4357         if ((r->action == PF_DROP) &&
4358             ((r->rule_flag & PFRULE_RETURNRST) ||
4359             (r->rule_flag & PFRULE_RETURNICMP) ||
4360             (r->rule_flag & PFRULE_RETURN))) {
4361                 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum,
4362                     bip_sum, hdrlen, &reason);
4363         }
4364
4365         if (r->action == PF_DROP)
4366                 goto cleanup;
4367
4368         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
4369                 REASON_SET(&reason, PFRES_MEMORY);
4370                 goto cleanup;
4371         }
4372         if (rtableid >= 0)
4373                 M_SETFIB(m, rtableid);
4374
4375         if (!state_icmp && (r->keep_state || nr != NULL ||
4376             (pd->flags & PFDESC_TCP_NORM))) {
4377                 int action;
4378                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
4379                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
4380                     hdrlen);
4381                 if (action != PF_PASS) {
4382                         if (action == PF_DROP &&
4383                             (r->rule_flag & PFRULE_RETURN))
4384                                 pf_return(r, nr, pd, sk, off, m, th, kif,
4385                                     bproto_sum, bip_sum, hdrlen, &reason);
4386                         return (action);
4387                 }
4388         } else {
4389                 if (sk != NULL)
4390                         uma_zfree(V_pf_state_key_z, sk);
4391                 if (nk != NULL)
4392                         uma_zfree(V_pf_state_key_z, nk);
4393         }
4394
4395         /* copy back packet headers if we performed NAT operations */
4396         if (rewrite)
4397                 m_copyback(m, off, hdrlen, pd->hdr.any);
4398
4399         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
4400             direction == PF_OUT &&
4401             V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m))
4402                 /*
4403                  * We want the state created, but we dont
4404                  * want to send this in case a partner
4405                  * firewall has to know about it to allow
4406                  * replies through it.
4407                  */
4408                 return (PF_DEFER);
4409
4410         return (PF_PASS);
4411
4412 cleanup:
4413         if (sk != NULL)
4414                 uma_zfree(V_pf_state_key_z, sk);
4415         if (nk != NULL)
4416                 uma_zfree(V_pf_state_key_z, nk);
4417         return (PF_DROP);
4418 }
4419
4420 static int
4421 pf_create_state(struct pf_krule *r, struct pf_krule *nr, struct pf_krule *a,
4422     struct pf_pdesc *pd, struct pf_ksrc_node *nsn, struct pf_state_key *nk,
4423     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
4424     u_int16_t dport, int *rewrite, struct pfi_kkif *kif, struct pf_kstate **sm,
4425     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
4426 {
4427         struct pf_kstate        *s = NULL;
4428         struct pf_ksrc_node     *sn = NULL;
4429         struct tcphdr           *th = &pd->hdr.tcp;
4430         u_int16_t                mss = V_tcp_mssdflt;
4431         u_short                  reason;
4432
4433         /* check maximums */
4434         if (r->max_states &&
4435             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
4436                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
4437                 REASON_SET(&reason, PFRES_MAXSTATES);
4438                 goto csfailed;
4439         }
4440         /* src node for filter rule */
4441         if ((r->rule_flag & PFRULE_SRCTRACK ||
4442             r->rpool.opts & PF_POOL_STICKYADDR) &&
4443             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
4444                 REASON_SET(&reason, PFRES_SRCLIMIT);
4445                 goto csfailed;
4446         }
4447         /* src node for translation rule */
4448         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
4449             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
4450                 REASON_SET(&reason, PFRES_SRCLIMIT);
4451                 goto csfailed;
4452         }
4453         s = pf_alloc_state(M_NOWAIT);
4454         if (s == NULL) {
4455                 REASON_SET(&reason, PFRES_MEMORY);
4456                 goto csfailed;
4457         }
4458         s->rule.ptr = r;
4459         s->nat_rule.ptr = nr;
4460         s->anchor.ptr = a;
4461         STATE_INC_COUNTERS(s);
4462         if (r->allow_opts)
4463                 s->state_flags |= PFSTATE_ALLOWOPTS;
4464         if (r->rule_flag & PFRULE_STATESLOPPY)
4465                 s->state_flags |= PFSTATE_SLOPPY;
4466         s->log = r->log & PF_LOG_ALL;
4467         s->sync_state = PFSYNC_S_NONE;
4468         s->qid = pd->act.qid;
4469         s->pqid = pd->act.pqid;
4470         s->dnpipe = pd->act.dnpipe;
4471         s->dnrpipe = pd->act.dnrpipe;
4472         s->state_flags |= pd->act.flags;
4473         if (nr != NULL)
4474                 s->log |= nr->log & PF_LOG_ALL;
4475         switch (pd->proto) {
4476         case IPPROTO_TCP:
4477                 s->src.seqlo = ntohl(th->th_seq);
4478                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
4479                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
4480                     r->keep_state == PF_STATE_MODULATE) {
4481                         /* Generate sequence number modulator */
4482                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
4483                             0)
4484                                 s->src.seqdiff = 1;
4485                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
4486                             htonl(s->src.seqlo + s->src.seqdiff), 0);
4487                         *rewrite = 1;
4488                 } else
4489                         s->src.seqdiff = 0;
4490                 if (th->th_flags & TH_SYN) {
4491                         s->src.seqhi++;
4492                         s->src.wscale = pf_get_wscale(m, off,
4493                             th->th_off, pd->af);
4494                 }
4495                 s->src.max_win = MAX(ntohs(th->th_win), 1);
4496                 if (s->src.wscale & PF_WSCALE_MASK) {
4497                         /* Remove scale factor from initial window */
4498                         int win = s->src.max_win;
4499                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
4500                         s->src.max_win = (win - 1) >>
4501                             (s->src.wscale & PF_WSCALE_MASK);
4502                 }
4503                 if (th->th_flags & TH_FIN)
4504                         s->src.seqhi++;
4505                 s->dst.seqhi = 1;
4506                 s->dst.max_win = 1;
4507                 pf_set_protostate(s, PF_PEER_SRC, TCPS_SYN_SENT);
4508                 pf_set_protostate(s, PF_PEER_DST, TCPS_CLOSED);
4509                 s->timeout = PFTM_TCP_FIRST_PACKET;
4510                 atomic_add_32(&V_pf_status.states_halfopen, 1);
4511                 break;
4512         case IPPROTO_UDP:
4513                 pf_set_protostate(s, PF_PEER_SRC, PFUDPS_SINGLE);
4514                 pf_set_protostate(s, PF_PEER_DST, PFUDPS_NO_TRAFFIC);
4515                 s->timeout = PFTM_UDP_FIRST_PACKET;
4516                 break;
4517         case IPPROTO_ICMP:
4518 #ifdef INET6
4519         case IPPROTO_ICMPV6:
4520 #endif
4521                 s->timeout = PFTM_ICMP_FIRST_PACKET;
4522                 break;
4523         default:
4524                 pf_set_protostate(s, PF_PEER_SRC, PFOTHERS_SINGLE);
4525                 pf_set_protostate(s, PF_PEER_DST, PFOTHERS_NO_TRAFFIC);
4526                 s->timeout = PFTM_OTHER_FIRST_PACKET;
4527         }
4528
4529         if (r->rt) {
4530                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
4531                         REASON_SET(&reason, PFRES_MAPFAILED);
4532                         pf_src_tree_remove_state(s);
4533                         s->timeout = PFTM_UNLINKED;
4534                         STATE_DEC_COUNTERS(s);
4535                         pf_free_state(s);
4536                         goto csfailed;
4537                 }
4538                 s->rt_kif = r->rpool.cur->kif;
4539         }
4540
4541         s->creation = time_uptime;
4542         s->expire = time_uptime;
4543
4544         if (sn != NULL)
4545                 s->src_node = sn;
4546         if (nsn != NULL) {
4547                 /* XXX We only modify one side for now. */
4548                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
4549                 s->nat_src_node = nsn;
4550         }
4551         if (pd->proto == IPPROTO_TCP) {
4552                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
4553                     off, pd, th, &s->src, &s->dst)) {
4554                         REASON_SET(&reason, PFRES_MEMORY);
4555                         pf_src_tree_remove_state(s);
4556                         s->timeout = PFTM_UNLINKED;
4557                         STATE_DEC_COUNTERS(s);
4558                         pf_free_state(s);
4559                         return (PF_DROP);
4560                 }
4561                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
4562                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
4563                     &s->src, &s->dst, rewrite)) {
4564                         /* This really shouldn't happen!!! */
4565                         DPFPRINTF(PF_DEBUG_URGENT,
4566                             ("pf_normalize_tcp_stateful failed on first "
4567                              "pkt\n"));
4568                         pf_src_tree_remove_state(s);
4569                         s->timeout = PFTM_UNLINKED;
4570                         STATE_DEC_COUNTERS(s);
4571                         pf_free_state(s);
4572                         return (PF_DROP);
4573                 }
4574         }
4575         s->direction = pd->dir;
4576
4577         /*
4578          * sk/nk could already been setup by pf_get_translation().
4579          */
4580         if (nr == NULL) {
4581                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
4582                     __func__, nr, sk, nk));
4583                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
4584                 if (sk == NULL)
4585                         goto csfailed;
4586                 nk = sk;
4587         } else
4588                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
4589                     __func__, nr, sk, nk));
4590
4591         /* Swap sk/nk for PF_OUT. */
4592         if (pf_state_insert(BOUND_IFACE(r, kif), kif,
4593             (pd->dir == PF_IN) ? sk : nk,
4594             (pd->dir == PF_IN) ? nk : sk, s)) {
4595                 REASON_SET(&reason, PFRES_STATEINS);
4596                 pf_src_tree_remove_state(s);
4597                 s->timeout = PFTM_UNLINKED;
4598                 STATE_DEC_COUNTERS(s);
4599                 pf_free_state(s);
4600                 return (PF_DROP);
4601         } else
4602                 *sm = s;
4603
4604         if (tag > 0)
4605                 s->tag = tag;
4606         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
4607             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
4608                 pf_set_protostate(s, PF_PEER_SRC, PF_TCPS_PROXY_SRC);
4609                 /* undo NAT changes, if they have taken place */
4610                 if (nr != NULL) {
4611                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
4612                         if (pd->dir == PF_OUT)
4613                                 skt = s->key[PF_SK_STACK];
4614                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
4615                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
4616                         if (pd->sport)
4617                                 *pd->sport = skt->port[pd->sidx];
4618                         if (pd->dport)
4619                                 *pd->dport = skt->port[pd->didx];
4620                         if (pd->proto_sum)
4621                                 *pd->proto_sum = bproto_sum;
4622                         if (pd->ip_sum)
4623                                 *pd->ip_sum = bip_sum;
4624                         m_copyback(m, off, hdrlen, pd->hdr.any);
4625                 }
4626                 s->src.seqhi = htonl(arc4random());
4627                 /* Find mss option */
4628                 int rtid = M_GETFIB(m);
4629                 mss = pf_get_mss(m, off, th->th_off, pd->af);
4630                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
4631                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
4632                 s->src.mss = mss;
4633                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
4634                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
4635                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0);
4636                 REASON_SET(&reason, PFRES_SYNPROXY);
4637                 return (PF_SYNPROXY_DROP);
4638         }
4639
4640         return (PF_PASS);
4641
4642 csfailed:
4643         if (sk != NULL)
4644                 uma_zfree(V_pf_state_key_z, sk);
4645         if (nk != NULL)
4646                 uma_zfree(V_pf_state_key_z, nk);
4647
4648         if (sn != NULL) {
4649                 struct pf_srchash *sh;
4650
4651                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
4652                 PF_HASHROW_LOCK(sh);
4653                 if (--sn->states == 0 && sn->expire == 0) {
4654                         pf_unlink_src_node(sn);
4655                         uma_zfree(V_pf_sources_z, sn);
4656                         counter_u64_add(
4657                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
4658                 }
4659                 PF_HASHROW_UNLOCK(sh);
4660         }
4661
4662         if (nsn != sn && nsn != NULL) {
4663                 struct pf_srchash *sh;
4664
4665                 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
4666                 PF_HASHROW_LOCK(sh);
4667                 if (--nsn->states == 0 && nsn->expire == 0) {
4668                         pf_unlink_src_node(nsn);
4669                         uma_zfree(V_pf_sources_z, nsn);
4670                         counter_u64_add(
4671                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
4672                 }
4673                 PF_HASHROW_UNLOCK(sh);
4674         }
4675
4676         return (PF_DROP);
4677 }
4678
4679 static int
4680 pf_test_fragment(struct pf_krule **rm, int direction, struct pfi_kkif *kif,
4681     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_krule **am,
4682     struct pf_kruleset **rsm)
4683 {
4684         struct pf_krule         *r, *a = NULL;
4685         struct pf_kruleset      *ruleset = NULL;
4686         sa_family_t              af = pd->af;
4687         u_short                  reason;
4688         int                      tag = -1;
4689         int                      asd = 0;
4690         int                      match = 0;
4691         struct pf_kanchor_stackframe    anchor_stack[PF_ANCHOR_STACKSIZE];
4692
4693         PF_RULES_RASSERT();
4694
4695         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
4696         while (r != NULL) {
4697                 pf_counter_u64_add(&r->evaluations, 1);
4698                 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
4699                         r = r->skip[PF_SKIP_IFP].ptr;
4700                 else if (r->direction && r->direction != direction)
4701                         r = r->skip[PF_SKIP_DIR].ptr;
4702                 else if (r->af && r->af != af)
4703                         r = r->skip[PF_SKIP_AF].ptr;
4704                 else if (r->proto && r->proto != pd->proto)
4705                         r = r->skip[PF_SKIP_PROTO].ptr;
4706                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
4707                     r->src.neg, kif, M_GETFIB(m)))
4708                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
4709                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
4710                     r->dst.neg, NULL, M_GETFIB(m)))
4711                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
4712                 else if (r->tos && !(r->tos == pd->tos))
4713                         r = TAILQ_NEXT(r, entries);
4714                 else if (r->os_fingerprint != PF_OSFP_ANY)
4715                         r = TAILQ_NEXT(r, entries);
4716                 else if (pd->proto == IPPROTO_UDP &&
4717                     (r->src.port_op || r->dst.port_op))
4718                         r = TAILQ_NEXT(r, entries);
4719                 else if (pd->proto == IPPROTO_TCP &&
4720                     (r->src.port_op || r->dst.port_op || r->flagset))
4721                         r = TAILQ_NEXT(r, entries);
4722                 else if ((pd->proto == IPPROTO_ICMP ||
4723                     pd->proto == IPPROTO_ICMPV6) &&
4724                     (r->type || r->code))
4725                         r = TAILQ_NEXT(r, entries);
4726                 else if (r->prio &&
4727                     !pf_match_ieee8021q_pcp(r->prio, m))
4728                         r = TAILQ_NEXT(r, entries);
4729                 else if (r->prob && r->prob <=
4730                     (arc4random() % (UINT_MAX - 1) + 1))
4731                         r = TAILQ_NEXT(r, entries);
4732                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
4733                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
4734                         r = TAILQ_NEXT(r, entries);
4735                 else {
4736                         if (r->anchor == NULL) {
4737                                 if (r->action == PF_MATCH) {
4738                                         pf_counter_u64_critical_enter();
4739                                         pf_counter_u64_add_protected(&r->packets[direction == PF_OUT], 1);
4740                                         pf_counter_u64_add_protected(&r->bytes[direction == PF_OUT], pd->tot_len);
4741                                         pf_counter_u64_critical_exit();
4742                                         pf_rule_to_actions(r, &pd->act);
4743                                         if (r->log)
4744                                                 PFLOG_PACKET(kif, m, af,
4745                                                     direction, PFRES_MATCH, r,
4746                                                     a, ruleset, pd, 1);
4747                                 } else {
4748                                         match = 1;
4749                                         *rm = r;
4750                                         *am = a;
4751                                         *rsm = ruleset;
4752                                 }
4753                                 if ((*rm)->quick)
4754                                         break;
4755                                 r = TAILQ_NEXT(r, entries);
4756                         } else
4757                                 pf_step_into_anchor(anchor_stack, &asd,
4758                                     &ruleset, PF_RULESET_FILTER, &r, &a,
4759                                     &match);
4760                 }
4761                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
4762                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
4763                         break;
4764         }
4765         r = *rm;
4766         a = *am;
4767         ruleset = *rsm;
4768
4769         REASON_SET(&reason, PFRES_MATCH);
4770
4771         /* apply actions for last matching pass/block rule */
4772         pf_rule_to_actions(r, &pd->act);
4773
4774         if (r->log)
4775                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
4776                     1);
4777
4778         if (r->action != PF_PASS)
4779                 return (PF_DROP);
4780
4781         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
4782                 REASON_SET(&reason, PFRES_MEMORY);
4783                 return (PF_DROP);
4784         }
4785
4786         return (PF_PASS);
4787 }
4788
4789 static int
4790 pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif,
4791     struct mbuf *m, int off, struct pf_pdesc *pd, u_short *reason,
4792     int *copyback)
4793 {
4794         struct tcphdr           *th = &pd->hdr.tcp;
4795         struct pf_state_peer    *src, *dst;
4796         u_int16_t                win = ntohs(th->th_win);
4797         u_int32_t                ack, end, seq, orig_seq;
4798         u_int8_t                 sws, dws, psrc, pdst;
4799         int                      ackskew;
4800
4801         if (pd->dir == (*state)->direction) {
4802                 src = &(*state)->src;
4803                 dst = &(*state)->dst;
4804                 psrc = PF_PEER_SRC;
4805                 pdst = PF_PEER_DST;
4806         } else {
4807                 src = &(*state)->dst;
4808                 dst = &(*state)->src;
4809                 psrc = PF_PEER_DST;
4810                 pdst = PF_PEER_SRC;
4811         }
4812
4813         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
4814                 sws = src->wscale & PF_WSCALE_MASK;
4815                 dws = dst->wscale & PF_WSCALE_MASK;
4816         } else
4817                 sws = dws = 0;
4818
4819         /*
4820          * Sequence tracking algorithm from Guido van Rooij's paper:
4821          *   http://www.madison-gurkha.com/publications/tcp_filtering/
4822          *      tcp_filtering.ps
4823          */
4824
4825         orig_seq = seq = ntohl(th->th_seq);
4826         if (src->seqlo == 0) {
4827                 /* First packet from this end. Set its state */
4828
4829                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
4830                     src->scrub == NULL) {
4831                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
4832                                 REASON_SET(reason, PFRES_MEMORY);
4833                                 return (PF_DROP);
4834                         }
4835                 }
4836
4837                 /* Deferred generation of sequence number modulator */
4838                 if (dst->seqdiff && !src->seqdiff) {
4839                         /* use random iss for the TCP server */
4840                         while ((src->seqdiff = arc4random() - seq) == 0)
4841                                 ;
4842                         ack = ntohl(th->th_ack) - dst->seqdiff;
4843                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4844                             src->seqdiff), 0);
4845                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4846                         *copyback = 1;
4847                 } else {
4848                         ack = ntohl(th->th_ack);
4849                 }
4850
4851                 end = seq + pd->p_len;
4852                 if (th->th_flags & TH_SYN) {
4853                         end++;
4854                         if (dst->wscale & PF_WSCALE_FLAG) {
4855                                 src->wscale = pf_get_wscale(m, off, th->th_off,
4856                                     pd->af);
4857                                 if (src->wscale & PF_WSCALE_FLAG) {
4858                                         /* Remove scale factor from initial
4859                                          * window */
4860                                         sws = src->wscale & PF_WSCALE_MASK;
4861                                         win = ((u_int32_t)win + (1 << sws) - 1)
4862                                             >> sws;
4863                                         dws = dst->wscale & PF_WSCALE_MASK;
4864                                 } else {
4865                                         /* fixup other window */
4866                                         dst->max_win <<= dst->wscale &
4867                                             PF_WSCALE_MASK;
4868                                         /* in case of a retrans SYN|ACK */
4869                                         dst->wscale = 0;
4870                                 }
4871                         }
4872                 }
4873                 if (th->th_flags & TH_FIN)
4874                         end++;
4875
4876                 src->seqlo = seq;
4877                 if (src->state < TCPS_SYN_SENT)
4878                         pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
4879
4880                 /*
4881                  * May need to slide the window (seqhi may have been set by
4882                  * the crappy stack check or if we picked up the connection
4883                  * after establishment)
4884                  */
4885                 if (src->seqhi == 1 ||
4886                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4887                         src->seqhi = end + MAX(1, dst->max_win << dws);
4888                 if (win > src->max_win)
4889                         src->max_win = win;
4890
4891         } else {
4892                 ack = ntohl(th->th_ack) - dst->seqdiff;
4893                 if (src->seqdiff) {
4894                         /* Modulate sequence numbers */
4895                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4896                             src->seqdiff), 0);
4897                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4898                         *copyback = 1;
4899                 }
4900                 end = seq + pd->p_len;
4901                 if (th->th_flags & TH_SYN)
4902                         end++;
4903                 if (th->th_flags & TH_FIN)
4904                         end++;
4905         }
4906
4907         if ((th->th_flags & TH_ACK) == 0) {
4908                 /* Let it pass through the ack skew check */
4909                 ack = dst->seqlo;
4910         } else if ((ack == 0 &&
4911             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4912             /* broken tcp stacks do not set ack */
4913             (dst->state < TCPS_SYN_SENT)) {
4914                 /*
4915                  * Many stacks (ours included) will set the ACK number in an
4916                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4917                  */
4918                 ack = dst->seqlo;
4919         }
4920
4921         if (seq == end) {
4922                 /* Ease sequencing restrictions on no data packets */
4923                 seq = src->seqlo;
4924                 end = seq;
4925         }
4926
4927         ackskew = dst->seqlo - ack;
4928
4929         /*
4930          * Need to demodulate the sequence numbers in any TCP SACK options
4931          * (Selective ACK). We could optionally validate the SACK values
4932          * against the current ACK window, either forwards or backwards, but
4933          * I'm not confident that SACK has been implemented properly
4934          * everywhere. It wouldn't surprise me if several stacks accidentally
4935          * SACK too far backwards of previously ACKed data. There really aren't
4936          * any security implications of bad SACKing unless the target stack
4937          * doesn't validate the option length correctly. Someone trying to
4938          * spoof into a TCP connection won't bother blindly sending SACK
4939          * options anyway.
4940          */
4941         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4942                 if (pf_modulate_sack(m, off, pd, th, dst))
4943                         *copyback = 1;
4944         }
4945
4946 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4947         if (SEQ_GEQ(src->seqhi, end) &&
4948             /* Last octet inside other's window space */
4949             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4950             /* Retrans: not more than one window back */
4951             (ackskew >= -MAXACKWINDOW) &&
4952             /* Acking not more than one reassembled fragment backwards */
4953             (ackskew <= (MAXACKWINDOW << sws)) &&
4954             /* Acking not more than one window forward */
4955             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4956             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4957             (pd->flags & PFDESC_IP_REAS) == 0)) {
4958             /* Require an exact/+1 sequence match on resets when possible */
4959
4960                 if (dst->scrub || src->scrub) {
4961                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4962                             *state, src, dst, copyback))
4963                                 return (PF_DROP);
4964                 }
4965
4966                 /* update max window */
4967                 if (src->max_win < win)
4968                         src->max_win = win;
4969                 /* synchronize sequencing */
4970                 if (SEQ_GT(end, src->seqlo))
4971                         src->seqlo = end;
4972                 /* slide the window of what the other end can send */
4973                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4974                         dst->seqhi = ack + MAX((win << sws), 1);
4975
4976                 /* update states */
4977                 if (th->th_flags & TH_SYN)
4978                         if (src->state < TCPS_SYN_SENT)
4979                                 pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
4980                 if (th->th_flags & TH_FIN)
4981                         if (src->state < TCPS_CLOSING)
4982                                 pf_set_protostate(*state, psrc, TCPS_CLOSING);
4983                 if (th->th_flags & TH_ACK) {
4984                         if (dst->state == TCPS_SYN_SENT) {
4985                                 pf_set_protostate(*state, pdst,
4986                                     TCPS_ESTABLISHED);
4987                                 if (src->state == TCPS_ESTABLISHED &&
4988                                     (*state)->src_node != NULL &&
4989                                     pf_src_connlimit(state)) {
4990                                         REASON_SET(reason, PFRES_SRCLIMIT);
4991                                         return (PF_DROP);
4992                                 }
4993                         } else if (dst->state == TCPS_CLOSING)
4994                                 pf_set_protostate(*state, pdst,
4995                                     TCPS_FIN_WAIT_2);
4996                 }
4997                 if (th->th_flags & TH_RST)
4998                         pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
4999
5000                 /* update expire time */
5001                 (*state)->expire = time_uptime;
5002                 if (src->state >= TCPS_FIN_WAIT_2 &&
5003                     dst->state >= TCPS_FIN_WAIT_2)
5004                         (*state)->timeout = PFTM_TCP_CLOSED;
5005                 else if (src->state >= TCPS_CLOSING &&
5006                     dst->state >= TCPS_CLOSING)
5007                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
5008                 else if (src->state < TCPS_ESTABLISHED ||
5009                     dst->state < TCPS_ESTABLISHED)
5010                         (*state)->timeout = PFTM_TCP_OPENING;
5011                 else if (src->state >= TCPS_CLOSING ||
5012                     dst->state >= TCPS_CLOSING)
5013                         (*state)->timeout = PFTM_TCP_CLOSING;
5014                 else
5015                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
5016
5017                 /* Fall through to PASS packet */
5018
5019         } else if ((dst->state < TCPS_SYN_SENT ||
5020                 dst->state >= TCPS_FIN_WAIT_2 ||
5021                 src->state >= TCPS_FIN_WAIT_2) &&
5022             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
5023             /* Within a window forward of the originating packet */
5024             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
5025             /* Within a window backward of the originating packet */
5026
5027                 /*
5028                  * This currently handles three situations:
5029                  *  1) Stupid stacks will shotgun SYNs before their peer
5030                  *     replies.
5031                  *  2) When PF catches an already established stream (the
5032                  *     firewall rebooted, the state table was flushed, routes
5033                  *     changed...)
5034                  *  3) Packets get funky immediately after the connection
5035                  *     closes (this should catch Solaris spurious ACK|FINs
5036                  *     that web servers like to spew after a close)
5037                  *
5038                  * This must be a little more careful than the above code
5039                  * since packet floods will also be caught here. We don't
5040                  * update the TTL here to mitigate the damage of a packet
5041                  * flood and so the same code can handle awkward establishment
5042                  * and a loosened connection close.
5043                  * In the establishment case, a correct peer response will
5044                  * validate the connection, go through the normal state code
5045                  * and keep updating the state TTL.
5046                  */
5047
5048                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5049                         printf("pf: loose state match: ");
5050                         pf_print_state(*state);
5051                         pf_print_flags(th->th_flags);
5052                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
5053                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
5054                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
5055                             (unsigned long long)(*state)->packets[1],
5056                             pd->dir == PF_IN ? "in" : "out",
5057                             pd->dir == (*state)->direction ? "fwd" : "rev");
5058                 }
5059
5060                 if (dst->scrub || src->scrub) {
5061                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
5062                             *state, src, dst, copyback))
5063                                 return (PF_DROP);
5064                 }
5065
5066                 /* update max window */
5067                 if (src->max_win < win)
5068                         src->max_win = win;
5069                 /* synchronize sequencing */
5070                 if (SEQ_GT(end, src->seqlo))
5071                         src->seqlo = end;
5072                 /* slide the window of what the other end can send */
5073                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
5074                         dst->seqhi = ack + MAX((win << sws), 1);
5075
5076                 /*
5077                  * Cannot set dst->seqhi here since this could be a shotgunned
5078                  * SYN and not an already established connection.
5079                  */
5080
5081                 if (th->th_flags & TH_FIN)
5082                         if (src->state < TCPS_CLOSING)
5083                                 pf_set_protostate(*state, psrc, TCPS_CLOSING);
5084                 if (th->th_flags & TH_RST)
5085                         pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
5086
5087                 /* Fall through to PASS packet */
5088
5089         } else {
5090                 if ((*state)->dst.state == TCPS_SYN_SENT &&
5091                     (*state)->src.state == TCPS_SYN_SENT) {
5092                         /* Send RST for state mismatches during handshake */
5093                         if (!(th->th_flags & TH_RST))
5094                                 pf_send_tcp((*state)->rule.ptr, pd->af,
5095                                     pd->dst, pd->src, th->th_dport,
5096                                     th->th_sport, ntohl(th->th_ack), 0,
5097                                     TH_RST, 0, 0,
5098                                     (*state)->rule.ptr->return_ttl, 1, 0);
5099                         src->seqlo = 0;
5100                         src->seqhi = 1;
5101                         src->max_win = 1;
5102                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
5103                         printf("pf: BAD state: ");
5104                         pf_print_state(*state);
5105                         pf_print_flags(th->th_flags);
5106                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
5107                             "pkts=%llu:%llu dir=%s,%s\n",
5108                             seq, orig_seq, ack, pd->p_len, ackskew,
5109                             (unsigned long long)(*state)->packets[0],
5110                             (unsigned long long)(*state)->packets[1],
5111                             pd->dir == PF_IN ? "in" : "out",
5112                             pd->dir == (*state)->direction ? "fwd" : "rev");
5113                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
5114                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
5115                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
5116                             ' ': '2',
5117                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
5118                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
5119                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
5120                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
5121                 }
5122                 REASON_SET(reason, PFRES_BADSTATE);
5123                 return (PF_DROP);
5124         }
5125
5126         return (PF_PASS);
5127 }
5128
5129 static int
5130 pf_tcp_track_sloppy(struct pf_kstate **state, struct pf_pdesc *pd, u_short *reason)
5131 {
5132         struct tcphdr           *th = &pd->hdr.tcp;
5133         struct pf_state_peer    *src, *dst;
5134         u_int8_t                 psrc, pdst;
5135
5136         if (pd->dir == (*state)->direction) {
5137                 src = &(*state)->src;
5138                 dst = &(*state)->dst;
5139                 psrc = PF_PEER_SRC;
5140                 pdst = PF_PEER_DST;
5141         } else {
5142                 src = &(*state)->dst;
5143                 dst = &(*state)->src;
5144                 psrc = PF_PEER_DST;
5145                 pdst = PF_PEER_SRC;
5146         }
5147
5148         if (th->th_flags & TH_SYN)
5149                 if (src->state < TCPS_SYN_SENT)
5150                         pf_set_protostate(*state, psrc, TCPS_SYN_SENT);
5151         if (th->th_flags & TH_FIN)
5152                 if (src->state < TCPS_CLOSING)
5153                         pf_set_protostate(*state, psrc, TCPS_CLOSING);
5154         if (th->th_flags & TH_ACK) {
5155                 if (dst->state == TCPS_SYN_SENT) {
5156                         pf_set_protostate(*state, pdst, TCPS_ESTABLISHED);
5157                         if (src->state == TCPS_ESTABLISHED &&
5158                             (*state)->src_node != NULL &&
5159                             pf_src_connlimit(state)) {
5160                                 REASON_SET(reason, PFRES_SRCLIMIT);
5161                                 return (PF_DROP);
5162                         }
5163                 } else if (dst->state == TCPS_CLOSING) {
5164                         pf_set_protostate(*state, pdst, TCPS_FIN_WAIT_2);
5165                 } else if (src->state == TCPS_SYN_SENT &&
5166                     dst->state < TCPS_SYN_SENT) {
5167                         /*
5168                          * Handle a special sloppy case where we only see one
5169                          * half of the connection. If there is a ACK after
5170                          * the initial SYN without ever seeing a packet from
5171                          * the destination, set the connection to established.
5172                          */
5173                         pf_set_protostate(*state, PF_PEER_BOTH,
5174                             TCPS_ESTABLISHED);
5175                         dst->state = src->state = TCPS_ESTABLISHED;
5176                         if ((*state)->src_node != NULL &&
5177                             pf_src_connlimit(state)) {
5178                                 REASON_SET(reason, PFRES_SRCLIMIT);
5179                                 return (PF_DROP);
5180                         }
5181                 } else if (src->state == TCPS_CLOSING &&
5182                     dst->state == TCPS_ESTABLISHED &&
5183                     dst->seqlo == 0) {
5184                         /*
5185                          * Handle the closing of half connections where we
5186                          * don't see the full bidirectional FIN/ACK+ACK
5187                          * handshake.
5188                          */
5189                         pf_set_protostate(*state, pdst, TCPS_CLOSING);
5190                 }
5191         }
5192         if (th->th_flags & TH_RST)
5193                 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_TIME_WAIT);
5194
5195         /* update expire time */
5196         (*state)->expire = time_uptime;
5197         if (src->state >= TCPS_FIN_WAIT_2 &&
5198             dst->state >= TCPS_FIN_WAIT_2)
5199                 (*state)->timeout = PFTM_TCP_CLOSED;
5200         else if (src->state >= TCPS_CLOSING &&
5201             dst->state >= TCPS_CLOSING)
5202                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
5203         else if (src->state < TCPS_ESTABLISHED ||
5204             dst->state < TCPS_ESTABLISHED)
5205                 (*state)->timeout = PFTM_TCP_OPENING;
5206         else if (src->state >= TCPS_CLOSING ||
5207             dst->state >= TCPS_CLOSING)
5208                 (*state)->timeout = PFTM_TCP_CLOSING;
5209         else
5210                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
5211
5212         return (PF_PASS);
5213 }
5214
5215 static int
5216 pf_synproxy(struct pf_pdesc *pd, struct pf_kstate **state, u_short *reason)
5217 {
5218         struct pf_state_key     *sk = (*state)->key[pd->didx];
5219         struct tcphdr           *th = &pd->hdr.tcp;
5220
5221         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
5222                 if (pd->dir != (*state)->direction) {
5223                         REASON_SET(reason, PFRES_SYNPROXY);
5224                         return (PF_SYNPROXY_DROP);
5225                 }
5226                 if (th->th_flags & TH_SYN) {
5227                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
5228                                 REASON_SET(reason, PFRES_SYNPROXY);
5229                                 return (PF_DROP);
5230                         }
5231                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
5232                             pd->src, th->th_dport, th->th_sport,
5233                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
5234                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0);
5235                         REASON_SET(reason, PFRES_SYNPROXY);
5236                         return (PF_SYNPROXY_DROP);
5237                 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK ||
5238                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
5239                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
5240                         REASON_SET(reason, PFRES_SYNPROXY);
5241                         return (PF_DROP);
5242                 } else if ((*state)->src_node != NULL &&
5243                     pf_src_connlimit(state)) {
5244                         REASON_SET(reason, PFRES_SRCLIMIT);
5245                         return (PF_DROP);
5246                 } else
5247                         pf_set_protostate(*state, PF_PEER_SRC,
5248                             PF_TCPS_PROXY_DST);
5249         }
5250         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
5251                 if (pd->dir == (*state)->direction) {
5252                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
5253                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
5254                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
5255                                 REASON_SET(reason, PFRES_SYNPROXY);
5256                                 return (PF_DROP);
5257                         }
5258                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
5259                         if ((*state)->dst.seqhi == 1)
5260                                 (*state)->dst.seqhi = htonl(arc4random());
5261                         pf_send_tcp((*state)->rule.ptr, pd->af,
5262                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
5263                             sk->port[pd->sidx], sk->port[pd->didx],
5264                             (*state)->dst.seqhi, 0, TH_SYN, 0,
5265                             (*state)->src.mss, 0, 0, (*state)->tag);
5266                         REASON_SET(reason, PFRES_SYNPROXY);
5267                         return (PF_SYNPROXY_DROP);
5268                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
5269                     (TH_SYN|TH_ACK)) ||
5270                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
5271                         REASON_SET(reason, PFRES_SYNPROXY);
5272                         return (PF_DROP);
5273                 } else {
5274                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
5275                         (*state)->dst.seqlo = ntohl(th->th_seq);
5276                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
5277                             pd->src, th->th_dport, th->th_sport,
5278                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
5279                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
5280                             (*state)->tag);
5281                         pf_send_tcp((*state)->rule.ptr, pd->af,
5282                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
5283                             sk->port[pd->sidx], sk->port[pd->didx],
5284                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
5285                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0);
5286                         (*state)->src.seqdiff = (*state)->dst.seqhi -
5287                             (*state)->src.seqlo;
5288                         (*state)->dst.seqdiff = (*state)->src.seqhi -
5289                             (*state)->dst.seqlo;
5290                         (*state)->src.seqhi = (*state)->src.seqlo +
5291                             (*state)->dst.max_win;
5292                         (*state)->dst.seqhi = (*state)->dst.seqlo +
5293                             (*state)->src.max_win;
5294                         (*state)->src.wscale = (*state)->dst.wscale = 0;
5295                         pf_set_protostate(*state, PF_PEER_BOTH,
5296                             TCPS_ESTABLISHED);
5297                         REASON_SET(reason, PFRES_SYNPROXY);
5298                         return (PF_SYNPROXY_DROP);
5299                 }
5300         }
5301
5302         return (PF_PASS);
5303 }
5304
5305 static int
5306 pf_test_state_tcp(struct pf_kstate **state, int direction, struct pfi_kkif *kif,
5307     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
5308     u_short *reason)
5309 {
5310         struct pf_state_key_cmp  key;
5311         struct tcphdr           *th = &pd->hdr.tcp;
5312         int                      copyback = 0;
5313         int                      action;
5314         struct pf_state_peer    *src, *dst;
5315
5316         bzero(&key, sizeof(key));
5317         key.af = pd->af;
5318         key.proto = IPPROTO_TCP;
5319         if (direction == PF_IN) {       /* wire side, straight */
5320                 PF_ACPY(&key.addr[0], pd->src, key.af);
5321                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5322                 key.port[0] = th->th_sport;
5323                 key.port[1] = th->th_dport;
5324         } else {                        /* stack side, reverse */
5325                 PF_ACPY(&key.addr[1], pd->src, key.af);
5326                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5327                 key.port[1] = th->th_sport;
5328                 key.port[0] = th->th_dport;
5329         }
5330
5331         STATE_LOOKUP(kif, &key, direction, *state, pd);
5332
5333         if (direction == (*state)->direction) {
5334                 src = &(*state)->src;
5335                 dst = &(*state)->dst;
5336         } else {
5337                 src = &(*state)->dst;
5338                 dst = &(*state)->src;
5339         }
5340
5341         if ((action = pf_synproxy(pd, state, reason)) != PF_PASS)
5342                 return (action);
5343
5344         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
5345             dst->state >= TCPS_FIN_WAIT_2 &&
5346             src->state >= TCPS_FIN_WAIT_2) {
5347                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5348                         printf("pf: state reuse ");
5349                         pf_print_state(*state);
5350                         pf_print_flags(th->th_flags);
5351                         printf("\n");
5352                 }
5353                 /* XXX make sure it's the same direction ?? */
5354                 pf_set_protostate(*state, PF_PEER_BOTH, TCPS_CLOSED);
5355                 pf_unlink_state(*state);
5356                 *state = NULL;
5357                 return (PF_DROP);
5358         }
5359
5360         if ((*state)->state_flags & PFSTATE_SLOPPY) {
5361                 if (pf_tcp_track_sloppy(state, pd, reason) == PF_DROP)
5362                         return (PF_DROP);
5363         } else {
5364                 if (pf_tcp_track_full(state, kif, m, off, pd, reason,
5365                     &copyback) == PF_DROP)
5366                         return (PF_DROP);
5367         }
5368
5369         /* translate source/destination address, if necessary */
5370         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5371                 struct pf_state_key *nk = (*state)->key[pd->didx];
5372
5373                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
5374                     nk->port[pd->sidx] != th->th_sport)
5375                         pf_change_ap(m, pd->src, &th->th_sport,
5376                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
5377                             nk->port[pd->sidx], 0, pd->af);
5378
5379                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
5380                     nk->port[pd->didx] != th->th_dport)
5381                         pf_change_ap(m, pd->dst, &th->th_dport,
5382                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
5383                             nk->port[pd->didx], 0, pd->af);
5384                 copyback = 1;
5385         }
5386
5387         /* Copyback sequence modulation or stateful scrub changes if needed */
5388         if (copyback)
5389                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
5390
5391         return (PF_PASS);
5392 }
5393
5394 static int
5395 pf_test_state_udp(struct pf_kstate **state, int direction, struct pfi_kkif *kif,
5396     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
5397 {
5398         struct pf_state_peer    *src, *dst;
5399         struct pf_state_key_cmp  key;
5400         struct udphdr           *uh = &pd->hdr.udp;
5401         uint8_t                  psrc, pdst;
5402
5403         bzero(&key, sizeof(key));
5404         key.af = pd->af;
5405         key.proto = IPPROTO_UDP;
5406         if (direction == PF_IN) {       /* wire side, straight */
5407                 PF_ACPY(&key.addr[0], pd->src, key.af);
5408                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5409                 key.port[0] = uh->uh_sport;
5410                 key.port[1] = uh->uh_dport;
5411         } else {                        /* stack side, reverse */
5412                 PF_ACPY(&key.addr[1], pd->src, key.af);
5413                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5414                 key.port[1] = uh->uh_sport;
5415                 key.port[0] = uh->uh_dport;
5416         }
5417
5418         STATE_LOOKUP(kif, &key, direction, *state, pd);
5419
5420         if (direction == (*state)->direction) {
5421                 src = &(*state)->src;
5422                 dst = &(*state)->dst;
5423                 psrc = PF_PEER_SRC;
5424                 pdst = PF_PEER_DST;
5425         } else {
5426                 src = &(*state)->dst;
5427                 dst = &(*state)->src;
5428                 psrc = PF_PEER_DST;
5429                 pdst = PF_PEER_SRC;
5430         }
5431
5432         /* update states */
5433         if (src->state < PFUDPS_SINGLE)
5434                 pf_set_protostate(*state, psrc, PFUDPS_SINGLE);
5435         if (dst->state == PFUDPS_SINGLE)
5436                 pf_set_protostate(*state, pdst, PFUDPS_MULTIPLE);
5437
5438         /* update expire time */
5439         (*state)->expire = time_uptime;
5440         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
5441                 (*state)->timeout = PFTM_UDP_MULTIPLE;
5442         else
5443                 (*state)->timeout = PFTM_UDP_SINGLE;
5444
5445         /* translate source/destination address, if necessary */
5446         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5447                 struct pf_state_key *nk = (*state)->key[pd->didx];
5448
5449                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
5450                     nk->port[pd->sidx] != uh->uh_sport)
5451                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
5452                             &uh->uh_sum, &nk->addr[pd->sidx],
5453                             nk->port[pd->sidx], 1, pd->af);
5454
5455                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
5456                     nk->port[pd->didx] != uh->uh_dport)
5457                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
5458                             &uh->uh_sum, &nk->addr[pd->didx],
5459                             nk->port[pd->didx], 1, pd->af);
5460                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
5461         }
5462
5463         return (PF_PASS);
5464 }
5465
5466 static int
5467 pf_test_state_icmp(struct pf_kstate **state, int direction, struct pfi_kkif *kif,
5468     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
5469 {
5470         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
5471         u_int16_t        icmpid = 0, *icmpsum;
5472         u_int8_t         icmptype, icmpcode;
5473         int              state_icmp = 0;
5474         struct pf_state_key_cmp key;
5475
5476         bzero(&key, sizeof(key));
5477         switch (pd->proto) {
5478 #ifdef INET
5479         case IPPROTO_ICMP:
5480                 icmptype = pd->hdr.icmp.icmp_type;
5481                 icmpcode = pd->hdr.icmp.icmp_code;
5482                 icmpid = pd->hdr.icmp.icmp_id;
5483                 icmpsum = &pd->hdr.icmp.icmp_cksum;
5484
5485                 if (icmptype == ICMP_UNREACH ||
5486                     icmptype == ICMP_SOURCEQUENCH ||
5487                     icmptype == ICMP_REDIRECT ||
5488                     icmptype == ICMP_TIMXCEED ||
5489                     icmptype == ICMP_PARAMPROB)
5490                         state_icmp++;
5491                 break;
5492 #endif /* INET */
5493 #ifdef INET6
5494         case IPPROTO_ICMPV6:
5495                 icmptype = pd->hdr.icmp6.icmp6_type;
5496                 icmpcode = pd->hdr.icmp6.icmp6_code;
5497                 icmpid = pd->hdr.icmp6.icmp6_id;
5498                 icmpsum = &pd->hdr.icmp6.icmp6_cksum;
5499
5500                 if (icmptype == ICMP6_DST_UNREACH ||
5501                     icmptype == ICMP6_PACKET_TOO_BIG ||
5502                     icmptype == ICMP6_TIME_EXCEEDED ||
5503                     icmptype == ICMP6_PARAM_PROB)
5504                         state_icmp++;
5505                 break;
5506 #endif /* INET6 */
5507         }
5508
5509         if (!state_icmp) {
5510                 /*
5511                  * ICMP query/reply message not related to a TCP/UDP packet.
5512                  * Search for an ICMP state.
5513                  */
5514                 key.af = pd->af;
5515                 key.proto = pd->proto;
5516                 key.port[0] = key.port[1] = icmpid;
5517                 if (direction == PF_IN) {       /* wire side, straight */
5518                         PF_ACPY(&key.addr[0], pd->src, key.af);
5519                         PF_ACPY(&key.addr[1], pd->dst, key.af);
5520                 } else {                        /* stack side, reverse */
5521                         PF_ACPY(&key.addr[1], pd->src, key.af);
5522                         PF_ACPY(&key.addr[0], pd->dst, key.af);
5523                 }
5524
5525                 STATE_LOOKUP(kif, &key, direction, *state, pd);
5526
5527                 (*state)->expire = time_uptime;
5528                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
5529
5530                 /* translate source/destination address, if necessary */
5531                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5532                         struct pf_state_key *nk = (*state)->key[pd->didx];
5533
5534                         switch (pd->af) {
5535 #ifdef INET
5536                         case AF_INET:
5537                                 if (PF_ANEQ(pd->src,
5538                                     &nk->addr[pd->sidx], AF_INET))
5539                                         pf_change_a(&saddr->v4.s_addr,
5540                                             pd->ip_sum,
5541                                             nk->addr[pd->sidx].v4.s_addr, 0);
5542
5543                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
5544                                     AF_INET))
5545                                         pf_change_a(&daddr->v4.s_addr,
5546                                             pd->ip_sum,
5547                                             nk->addr[pd->didx].v4.s_addr, 0);
5548
5549                                 if (nk->port[0] !=
5550                                     pd->hdr.icmp.icmp_id) {
5551                                         pd->hdr.icmp.icmp_cksum =
5552                                             pf_cksum_fixup(
5553                                             pd->hdr.icmp.icmp_cksum, icmpid,
5554                                             nk->port[pd->sidx], 0);
5555                                         pd->hdr.icmp.icmp_id =
5556                                             nk->port[pd->sidx];
5557                                 }
5558
5559                                 m_copyback(m, off, ICMP_MINLEN,
5560                                     (caddr_t )&pd->hdr.icmp);
5561                                 break;
5562 #endif /* INET */
5563 #ifdef INET6
5564                         case AF_INET6:
5565                                 if (PF_ANEQ(pd->src,
5566                                     &nk->addr[pd->sidx], AF_INET6))
5567                                         pf_change_a6(saddr,
5568                                             &pd->hdr.icmp6.icmp6_cksum,
5569                                             &nk->addr[pd->sidx], 0);
5570
5571                                 if (PF_ANEQ(pd->dst,
5572                                     &nk->addr[pd->didx], AF_INET6))
5573                                         pf_change_a6(daddr,
5574                                             &pd->hdr.icmp6.icmp6_cksum,
5575                                             &nk->addr[pd->didx], 0);
5576
5577                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5578                                     (caddr_t )&pd->hdr.icmp6);
5579                                 break;
5580 #endif /* INET6 */
5581                         }
5582                 }
5583                 return (PF_PASS);
5584
5585         } else {
5586                 /*
5587                  * ICMP error message in response to a TCP/UDP packet.
5588                  * Extract the inner TCP/UDP header and search for that state.
5589                  */
5590
5591                 struct pf_pdesc pd2;
5592                 bzero(&pd2, sizeof pd2);
5593 #ifdef INET
5594                 struct ip       h2;
5595 #endif /* INET */
5596 #ifdef INET6
5597                 struct ip6_hdr  h2_6;
5598                 int             terminal = 0;
5599 #endif /* INET6 */
5600                 int             ipoff2 = 0;
5601                 int             off2 = 0;
5602
5603                 pd2.af = pd->af;
5604                 /* Payload packet is from the opposite direction. */
5605                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
5606                 pd2.didx = (direction == PF_IN) ? 0 : 1;
5607                 switch (pd->af) {
5608 #ifdef INET
5609                 case AF_INET:
5610                         /* offset of h2 in mbuf chain */
5611                         ipoff2 = off + ICMP_MINLEN;
5612
5613                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
5614                             NULL, reason, pd2.af)) {
5615                                 DPFPRINTF(PF_DEBUG_MISC,
5616                                     ("pf: ICMP error message too short "
5617                                     "(ip)\n"));
5618                                 return (PF_DROP);
5619                         }
5620                         /*
5621                          * ICMP error messages don't refer to non-first
5622                          * fragments
5623                          */
5624                         if (h2.ip_off & htons(IP_OFFMASK)) {
5625                                 REASON_SET(reason, PFRES_FRAG);
5626                                 return (PF_DROP);
5627                         }
5628
5629                         /* offset of protocol header that follows h2 */
5630                         off2 = ipoff2 + (h2.ip_hl << 2);
5631
5632                         pd2.proto = h2.ip_p;
5633                         pd2.src = (struct pf_addr *)&h2.ip_src;
5634                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
5635                         pd2.ip_sum = &h2.ip_sum;
5636                         break;
5637 #endif /* INET */
5638 #ifdef INET6
5639                 case AF_INET6:
5640                         ipoff2 = off + sizeof(struct icmp6_hdr);
5641
5642                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
5643                             NULL, reason, pd2.af)) {
5644                                 DPFPRINTF(PF_DEBUG_MISC,
5645                                     ("pf: ICMP error message too short "
5646                                     "(ip6)\n"));
5647                                 return (PF_DROP);
5648                         }
5649                         pd2.proto = h2_6.ip6_nxt;
5650                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
5651                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
5652                         pd2.ip_sum = NULL;
5653                         off2 = ipoff2 + sizeof(h2_6);
5654                         do {
5655                                 switch (pd2.proto) {
5656                                 case IPPROTO_FRAGMENT:
5657                                         /*
5658                                          * ICMPv6 error messages for
5659                                          * non-first fragments
5660                                          */
5661                                         REASON_SET(reason, PFRES_FRAG);
5662                                         return (PF_DROP);
5663                                 case IPPROTO_AH:
5664                                 case IPPROTO_HOPOPTS:
5665                                 case IPPROTO_ROUTING:
5666                                 case IPPROTO_DSTOPTS: {
5667                                         /* get next header and header length */
5668                                         struct ip6_ext opt6;
5669
5670                                         if (!pf_pull_hdr(m, off2, &opt6,
5671                                             sizeof(opt6), NULL, reason,
5672                                             pd2.af)) {
5673                                                 DPFPRINTF(PF_DEBUG_MISC,
5674                                                     ("pf: ICMPv6 short opt\n"));
5675                                                 return (PF_DROP);
5676                                         }
5677                                         if (pd2.proto == IPPROTO_AH)
5678                                                 off2 += (opt6.ip6e_len + 2) * 4;
5679                                         else
5680                                                 off2 += (opt6.ip6e_len + 1) * 8;
5681                                         pd2.proto = opt6.ip6e_nxt;
5682                                         /* goto the next header */
5683                                         break;
5684                                 }
5685                                 default:
5686                                         terminal++;
5687                                         break;
5688                                 }
5689                         } while (!terminal);
5690                         break;
5691 #endif /* INET6 */
5692                 }
5693
5694                 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) {
5695                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
5696                                 printf("pf: BAD ICMP %d:%d outer dst: ",
5697                                     icmptype, icmpcode);
5698                                 pf_print_host(pd->src, 0, pd->af);
5699                                 printf(" -> ");
5700                                 pf_print_host(pd->dst, 0, pd->af);
5701                                 printf(" inner src: ");
5702                                 pf_print_host(pd2.src, 0, pd2.af);
5703                                 printf(" -> ");
5704                                 pf_print_host(pd2.dst, 0, pd2.af);
5705                                 printf("\n");
5706                         }
5707                         REASON_SET(reason, PFRES_BADSTATE);
5708                         return (PF_DROP);
5709                 }
5710
5711                 switch (pd2.proto) {
5712                 case IPPROTO_TCP: {
5713                         struct tcphdr            th;
5714                         u_int32_t                seq;
5715                         struct pf_state_peer    *src, *dst;
5716                         u_int8_t                 dws;
5717                         int                      copyback = 0;
5718
5719                         /*
5720                          * Only the first 8 bytes of the TCP header can be
5721                          * expected. Don't access any TCP header fields after
5722                          * th_seq, an ackskew test is not possible.
5723                          */
5724                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
5725                             pd2.af)) {
5726                                 DPFPRINTF(PF_DEBUG_MISC,
5727                                     ("pf: ICMP error message too short "
5728                                     "(tcp)\n"));
5729                                 return (PF_DROP);
5730                         }
5731
5732                         key.af = pd2.af;
5733                         key.proto = IPPROTO_TCP;
5734                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5735                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5736                         key.port[pd2.sidx] = th.th_sport;
5737                         key.port[pd2.didx] = th.th_dport;
5738
5739                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5740
5741                         if (direction == (*state)->direction) {
5742                                 src = &(*state)->dst;
5743                                 dst = &(*state)->src;
5744                         } else {
5745                                 src = &(*state)->src;
5746                                 dst = &(*state)->dst;
5747                         }
5748
5749                         if (src->wscale && dst->wscale)
5750                                 dws = dst->wscale & PF_WSCALE_MASK;
5751                         else
5752                                 dws = 0;
5753
5754                         /* Demodulate sequence number */
5755                         seq = ntohl(th.th_seq) - src->seqdiff;
5756                         if (src->seqdiff) {
5757                                 pf_change_a(&th.th_seq, icmpsum,
5758                                     htonl(seq), 0);
5759                                 copyback = 1;
5760                         }
5761
5762                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
5763                             (!SEQ_GEQ(src->seqhi, seq) ||
5764                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
5765                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5766                                         printf("pf: BAD ICMP %d:%d ",
5767                                             icmptype, icmpcode);
5768                                         pf_print_host(pd->src, 0, pd->af);
5769                                         printf(" -> ");
5770                                         pf_print_host(pd->dst, 0, pd->af);
5771                                         printf(" state: ");
5772                                         pf_print_state(*state);
5773                                         printf(" seq=%u\n", seq);
5774                                 }
5775                                 REASON_SET(reason, PFRES_BADSTATE);
5776                                 return (PF_DROP);
5777                         } else {
5778                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
5779                                         printf("pf: OK ICMP %d:%d ",
5780                                             icmptype, icmpcode);
5781                                         pf_print_host(pd->src, 0, pd->af);
5782                                         printf(" -> ");
5783                                         pf_print_host(pd->dst, 0, pd->af);
5784                                         printf(" state: ");
5785                                         pf_print_state(*state);
5786                                         printf(" seq=%u\n", seq);
5787                                 }
5788                         }
5789
5790                         /* translate source/destination address, if necessary */
5791                         if ((*state)->key[PF_SK_WIRE] !=
5792                             (*state)->key[PF_SK_STACK]) {
5793                                 struct pf_state_key *nk =
5794                                     (*state)->key[pd->didx];
5795
5796                                 if (PF_ANEQ(pd2.src,
5797                                     &nk->addr[pd2.sidx], pd2.af) ||
5798                                     nk->port[pd2.sidx] != th.th_sport)
5799                                         pf_change_icmp(pd2.src, &th.th_sport,
5800                                             daddr, &nk->addr[pd2.sidx],
5801                                             nk->port[pd2.sidx], NULL,
5802                                             pd2.ip_sum, icmpsum,
5803                                             pd->ip_sum, 0, pd2.af);
5804
5805                                 if (PF_ANEQ(pd2.dst,
5806                                     &nk->addr[pd2.didx], pd2.af) ||
5807                                     nk->port[pd2.didx] != th.th_dport)
5808                                         pf_change_icmp(pd2.dst, &th.th_dport,
5809                                             saddr, &nk->addr[pd2.didx],
5810                                             nk->port[pd2.didx], NULL,
5811                                             pd2.ip_sum, icmpsum,
5812                                             pd->ip_sum, 0, pd2.af);
5813                                 copyback = 1;
5814                         }
5815
5816                         if (copyback) {
5817                                 switch (pd2.af) {
5818 #ifdef INET
5819                                 case AF_INET:
5820                                         m_copyback(m, off, ICMP_MINLEN,
5821                                             (caddr_t )&pd->hdr.icmp);
5822                                         m_copyback(m, ipoff2, sizeof(h2),
5823                                             (caddr_t )&h2);
5824                                         break;
5825 #endif /* INET */
5826 #ifdef INET6
5827                                 case AF_INET6:
5828                                         m_copyback(m, off,
5829                                             sizeof(struct icmp6_hdr),
5830                                             (caddr_t )&pd->hdr.icmp6);
5831                                         m_copyback(m, ipoff2, sizeof(h2_6),
5832                                             (caddr_t )&h2_6);
5833                                         break;
5834 #endif /* INET6 */
5835                                 }
5836                                 m_copyback(m, off2, 8, (caddr_t)&th);
5837                         }
5838
5839                         return (PF_PASS);
5840                         break;
5841                 }
5842                 case IPPROTO_UDP: {
5843                         struct udphdr           uh;
5844
5845                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
5846                             NULL, reason, pd2.af)) {
5847                                 DPFPRINTF(PF_DEBUG_MISC,
5848                                     ("pf: ICMP error message too short "
5849                                     "(udp)\n"));
5850                                 return (PF_DROP);
5851                         }
5852
5853                         key.af = pd2.af;
5854                         key.proto = IPPROTO_UDP;
5855                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5856                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5857                         key.port[pd2.sidx] = uh.uh_sport;
5858                         key.port[pd2.didx] = uh.uh_dport;
5859
5860                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5861
5862                         /* translate source/destination address, if necessary */
5863                         if ((*state)->key[PF_SK_WIRE] !=
5864                             (*state)->key[PF_SK_STACK]) {
5865                                 struct pf_state_key *nk =
5866                                     (*state)->key[pd->didx];
5867
5868                                 if (PF_ANEQ(pd2.src,
5869                                     &nk->addr[pd2.sidx], pd2.af) ||
5870                                     nk->port[pd2.sidx] != uh.uh_sport)
5871                                         pf_change_icmp(pd2.src, &uh.uh_sport,
5872                                             daddr, &nk->addr[pd2.sidx],
5873                                             nk->port[pd2.sidx], &uh.uh_sum,
5874                                             pd2.ip_sum, icmpsum,
5875                                             pd->ip_sum, 1, pd2.af);
5876
5877                                 if (PF_ANEQ(pd2.dst,
5878                                     &nk->addr[pd2.didx], pd2.af) ||
5879                                     nk->port[pd2.didx] != uh.uh_dport)
5880                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
5881                                             saddr, &nk->addr[pd2.didx],
5882                                             nk->port[pd2.didx], &uh.uh_sum,
5883                                             pd2.ip_sum, icmpsum,
5884                                             pd->ip_sum, 1, pd2.af);
5885
5886                                 switch (pd2.af) {
5887 #ifdef INET
5888                                 case AF_INET:
5889                                         m_copyback(m, off, ICMP_MINLEN,
5890                                             (caddr_t )&pd->hdr.icmp);
5891                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5892                                         break;
5893 #endif /* INET */
5894 #ifdef INET6
5895                                 case AF_INET6:
5896                                         m_copyback(m, off,
5897                                             sizeof(struct icmp6_hdr),
5898                                             (caddr_t )&pd->hdr.icmp6);
5899                                         m_copyback(m, ipoff2, sizeof(h2_6),
5900                                             (caddr_t )&h2_6);
5901                                         break;
5902 #endif /* INET6 */
5903                                 }
5904                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5905                         }
5906                         return (PF_PASS);
5907                         break;
5908                 }
5909 #ifdef INET
5910                 case IPPROTO_ICMP: {
5911                         struct icmp             iih;
5912
5913                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5914                             NULL, reason, pd2.af)) {
5915                                 DPFPRINTF(PF_DEBUG_MISC,
5916                                     ("pf: ICMP error message too short i"
5917                                     "(icmp)\n"));
5918                                 return (PF_DROP);
5919                         }
5920
5921                         key.af = pd2.af;
5922                         key.proto = IPPROTO_ICMP;
5923                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5924                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5925                         key.port[0] = key.port[1] = iih.icmp_id;
5926
5927                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5928
5929                         /* translate source/destination address, if necessary */
5930                         if ((*state)->key[PF_SK_WIRE] !=
5931                             (*state)->key[PF_SK_STACK]) {
5932                                 struct pf_state_key *nk =
5933                                     (*state)->key[pd->didx];
5934
5935                                 if (PF_ANEQ(pd2.src,
5936                                     &nk->addr[pd2.sidx], pd2.af) ||
5937                                     nk->port[pd2.sidx] != iih.icmp_id)
5938                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5939                                             daddr, &nk->addr[pd2.sidx],
5940                                             nk->port[pd2.sidx], NULL,
5941                                             pd2.ip_sum, icmpsum,
5942                                             pd->ip_sum, 0, AF_INET);
5943
5944                                 if (PF_ANEQ(pd2.dst,
5945                                     &nk->addr[pd2.didx], pd2.af) ||
5946                                     nk->port[pd2.didx] != iih.icmp_id)
5947                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5948                                             saddr, &nk->addr[pd2.didx],
5949                                             nk->port[pd2.didx], NULL,
5950                                             pd2.ip_sum, icmpsum,
5951                                             pd->ip_sum, 0, AF_INET);
5952
5953                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)&pd->hdr.icmp);
5954                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5955                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5956                         }
5957                         return (PF_PASS);
5958                         break;
5959                 }
5960 #endif /* INET */
5961 #ifdef INET6
5962                 case IPPROTO_ICMPV6: {
5963                         struct icmp6_hdr        iih;
5964
5965                         if (!pf_pull_hdr(m, off2, &iih,
5966                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5967                                 DPFPRINTF(PF_DEBUG_MISC,
5968                                     ("pf: ICMP error message too short "
5969                                     "(icmp6)\n"));
5970                                 return (PF_DROP);
5971                         }
5972
5973                         key.af = pd2.af;
5974                         key.proto = IPPROTO_ICMPV6;
5975                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5976                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5977                         key.port[0] = key.port[1] = iih.icmp6_id;
5978
5979                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5980
5981                         /* translate source/destination address, if necessary */
5982                         if ((*state)->key[PF_SK_WIRE] !=
5983                             (*state)->key[PF_SK_STACK]) {
5984                                 struct pf_state_key *nk =
5985                                     (*state)->key[pd->didx];
5986
5987                                 if (PF_ANEQ(pd2.src,
5988                                     &nk->addr[pd2.sidx], pd2.af) ||
5989                                     nk->port[pd2.sidx] != iih.icmp6_id)
5990                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5991                                             daddr, &nk->addr[pd2.sidx],
5992                                             nk->port[pd2.sidx], NULL,
5993                                             pd2.ip_sum, icmpsum,
5994                                             pd->ip_sum, 0, AF_INET6);
5995
5996                                 if (PF_ANEQ(pd2.dst,
5997                                     &nk->addr[pd2.didx], pd2.af) ||
5998                                     nk->port[pd2.didx] != iih.icmp6_id)
5999                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
6000                                             saddr, &nk->addr[pd2.didx],
6001                                             nk->port[pd2.didx], NULL,
6002                                             pd2.ip_sum, icmpsum,
6003                                             pd->ip_sum, 0, AF_INET6);
6004
6005                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
6006                                     (caddr_t)&pd->hdr.icmp6);
6007                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
6008                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
6009                                     (caddr_t)&iih);
6010                         }
6011                         return (PF_PASS);
6012                         break;
6013                 }
6014 #endif /* INET6 */
6015                 default: {
6016                         key.af = pd2.af;
6017                         key.proto = pd2.proto;
6018                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
6019                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
6020                         key.port[0] = key.port[1] = 0;
6021
6022                         STATE_LOOKUP(kif, &key, direction, *state, pd);
6023
6024                         /* translate source/destination address, if necessary */
6025                         if ((*state)->key[PF_SK_WIRE] !=
6026                             (*state)->key[PF_SK_STACK]) {
6027                                 struct pf_state_key *nk =
6028                                     (*state)->key[pd->didx];
6029
6030                                 if (PF_ANEQ(pd2.src,
6031                                     &nk->addr[pd2.sidx], pd2.af))
6032                                         pf_change_icmp(pd2.src, NULL, daddr,
6033                                             &nk->addr[pd2.sidx], 0, NULL,
6034                                             pd2.ip_sum, icmpsum,
6035                                             pd->ip_sum, 0, pd2.af);
6036
6037                                 if (PF_ANEQ(pd2.dst,
6038                                     &nk->addr[pd2.didx], pd2.af))
6039                                         pf_change_icmp(pd2.dst, NULL, saddr,
6040                                             &nk->addr[pd2.didx], 0, NULL,
6041                                             pd2.ip_sum, icmpsum,
6042                                             pd->ip_sum, 0, pd2.af);
6043
6044                                 switch (pd2.af) {
6045 #ifdef INET
6046                                 case AF_INET:
6047                                         m_copyback(m, off, ICMP_MINLEN,
6048                                             (caddr_t)&pd->hdr.icmp);
6049                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
6050                                         break;
6051 #endif /* INET */
6052 #ifdef INET6
6053                                 case AF_INET6:
6054                                         m_copyback(m, off,
6055                                             sizeof(struct icmp6_hdr),
6056                                             (caddr_t )&pd->hdr.icmp6);
6057                                         m_copyback(m, ipoff2, sizeof(h2_6),
6058                                             (caddr_t )&h2_6);
6059                                         break;
6060 #endif /* INET6 */
6061                                 }
6062                         }
6063                         return (PF_PASS);
6064                         break;
6065                 }
6066                 }
6067         }
6068 }
6069
6070 static int
6071 pf_test_state_other(struct pf_kstate **state, int direction, struct pfi_kkif *kif,
6072     struct mbuf *m, struct pf_pdesc *pd)
6073 {
6074         struct pf_state_peer    *src, *dst;
6075         struct pf_state_key_cmp  key;
6076         uint8_t                  psrc, pdst;
6077
6078         bzero(&key, sizeof(key));
6079         key.af = pd->af;
6080         key.proto = pd->proto;
6081         if (direction == PF_IN) {
6082                 PF_ACPY(&key.addr[0], pd->src, key.af);
6083                 PF_ACPY(&key.addr[1], pd->dst, key.af);
6084                 key.port[0] = key.port[1] = 0;
6085         } else {
6086                 PF_ACPY(&key.addr[1], pd->src, key.af);
6087                 PF_ACPY(&key.addr[0], pd->dst, key.af);
6088                 key.port[1] = key.port[0] = 0;
6089         }
6090
6091         STATE_LOOKUP(kif, &key, direction, *state, pd);
6092
6093         if (direction == (*state)->direction) {
6094                 src = &(*state)->src;
6095                 dst = &(*state)->dst;
6096                 psrc = PF_PEER_SRC;
6097                 pdst = PF_PEER_DST;
6098         } else {
6099                 src = &(*state)->dst;
6100                 dst = &(*state)->src;
6101                 psrc = PF_PEER_DST;
6102                 pdst = PF_PEER_SRC;
6103         }
6104
6105         /* update states */
6106         if (src->state < PFOTHERS_SINGLE)
6107                 pf_set_protostate(*state, psrc, PFOTHERS_SINGLE);
6108         if (dst->state == PFOTHERS_SINGLE)
6109                 pf_set_protostate(*state, pdst, PFOTHERS_MULTIPLE);
6110
6111         /* update expire time */
6112         (*state)->expire = time_uptime;
6113         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
6114                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
6115         else
6116                 (*state)->timeout = PFTM_OTHER_SINGLE;
6117
6118         /* translate source/destination address, if necessary */
6119         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
6120                 struct pf_state_key *nk = (*state)->key[pd->didx];
6121
6122                 KASSERT(nk, ("%s: nk is null", __func__));
6123                 KASSERT(pd, ("%s: pd is null", __func__));
6124                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
6125                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
6126                 switch (pd->af) {
6127 #ifdef INET
6128                 case AF_INET:
6129                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
6130                                 pf_change_a(&pd->src->v4.s_addr,
6131                                     pd->ip_sum,
6132                                     nk->addr[pd->sidx].v4.s_addr,
6133                                     0);
6134
6135                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
6136                                 pf_change_a(&pd->dst->v4.s_addr,
6137                                     pd->ip_sum,
6138                                     nk->addr[pd->didx].v4.s_addr,
6139                                     0);
6140
6141                         break;
6142 #endif /* INET */
6143 #ifdef INET6
6144                 case AF_INET6:
6145                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
6146                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
6147
6148                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
6149                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
6150 #endif /* INET6 */
6151                 }
6152         }
6153         return (PF_PASS);
6154 }
6155
6156 /*
6157  * ipoff and off are measured from the start of the mbuf chain.
6158  * h must be at "ipoff" on the mbuf chain.
6159  */
6160 void *
6161 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
6162     u_short *actionp, u_short *reasonp, sa_family_t af)
6163 {
6164         switch (af) {
6165 #ifdef INET
6166         case AF_INET: {
6167                 struct ip       *h = mtod(m, struct ip *);
6168                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
6169
6170                 if (fragoff) {
6171                         if (fragoff >= len)
6172                                 ACTION_SET(actionp, PF_PASS);
6173                         else {
6174                                 ACTION_SET(actionp, PF_DROP);
6175                                 REASON_SET(reasonp, PFRES_FRAG);
6176                         }
6177                         return (NULL);
6178                 }
6179                 if (m->m_pkthdr.len < off + len ||
6180                     ntohs(h->ip_len) < off + len) {
6181                         ACTION_SET(actionp, PF_DROP);
6182                         REASON_SET(reasonp, PFRES_SHORT);
6183                         return (NULL);
6184                 }
6185                 break;
6186         }
6187 #endif /* INET */
6188 #ifdef INET6
6189         case AF_INET6: {
6190                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
6191
6192                 if (m->m_pkthdr.len < off + len ||
6193                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
6194                     (unsigned)(off + len)) {
6195                         ACTION_SET(actionp, PF_DROP);
6196                         REASON_SET(reasonp, PFRES_SHORT);
6197                         return (NULL);
6198                 }
6199                 break;
6200         }
6201 #endif /* INET6 */
6202         }
6203         m_copydata(m, off, len, p);
6204         return (p);
6205 }
6206
6207 int
6208 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kkif *kif,
6209     int rtableid)
6210 {
6211         struct ifnet            *ifp;
6212
6213         /*
6214          * Skip check for addresses with embedded interface scope,
6215          * as they would always match anyway.
6216          */
6217         if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
6218                 return (1);
6219
6220         if (af != AF_INET && af != AF_INET6)
6221                 return (0);
6222
6223         /* Skip checks for ipsec interfaces */
6224         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
6225                 return (1);
6226
6227         ifp = (kif != NULL) ? kif->pfik_ifp : NULL;
6228
6229         switch (af) {
6230 #ifdef INET6
6231         case AF_INET6:
6232                 return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE,
6233                     ifp));
6234 #endif
6235 #ifdef INET
6236         case AF_INET:
6237                 return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE,
6238                     ifp));
6239 #endif
6240         }
6241
6242         return (0);
6243 }
6244
6245 #ifdef INET
6246 static void
6247 pf_route(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp,
6248     struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp)
6249 {
6250         struct mbuf             *m0, *m1;
6251         struct sockaddr_in      dst;
6252         struct ip               *ip;
6253         struct ifnet            *ifp = NULL;
6254         struct pf_addr           naddr;
6255         struct pf_ksrc_node     *sn = NULL;
6256         int                      error = 0;
6257         uint16_t                 ip_len, ip_off;
6258
6259         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
6260         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
6261             __func__));
6262
6263         if ((pd->pf_mtag == NULL &&
6264             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
6265             pd->pf_mtag->routed++ > 3) {
6266                 m0 = *m;
6267                 *m = NULL;
6268                 goto bad_locked;
6269         }
6270
6271         if (r->rt == PF_DUPTO) {
6272                 if ((pd->pf_mtag->flags & PF_DUPLICATED)) {
6273                         if (s == NULL) {
6274                                 ifp = r->rpool.cur->kif ?
6275                                     r->rpool.cur->kif->pfik_ifp : NULL;
6276                         } else {
6277                                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6278                                 PF_STATE_UNLOCK(s);
6279                         }
6280                         if (ifp == oifp) {
6281                                 /* When the 2nd interface is not skipped */
6282                                 return;
6283                         } else {
6284                                 m0 = *m;
6285                                 *m = NULL;
6286                                 goto bad;
6287                         }
6288                 } else {
6289                         pd->pf_mtag->flags |= PF_DUPLICATED;
6290                         if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) {
6291                                 if (s)
6292                                         PF_STATE_UNLOCK(s);
6293                                 return;
6294                         }
6295                 }
6296         } else {
6297                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
6298                         if (s)
6299                                 PF_STATE_UNLOCK(s);
6300                         return;
6301                 }
6302                 m0 = *m;
6303         }
6304
6305         ip = mtod(m0, struct ip *);
6306
6307         bzero(&dst, sizeof(dst));
6308         dst.sin_family = AF_INET;
6309         dst.sin_len = sizeof(dst);
6310         dst.sin_addr = ip->ip_dst;
6311
6312         bzero(&naddr, sizeof(naddr));
6313
6314         if (s == NULL) {
6315                 if (TAILQ_EMPTY(&r->rpool.list)) {
6316                         DPFPRINTF(PF_DEBUG_URGENT,
6317                             ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
6318                         goto bad_locked;
6319                 }
6320                 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
6321                     &naddr, NULL, &sn);
6322                 if (!PF_AZERO(&naddr, AF_INET))
6323                         dst.sin_addr.s_addr = naddr.v4.s_addr;
6324                 ifp = r->rpool.cur->kif ?
6325                     r->rpool.cur->kif->pfik_ifp : NULL;
6326         } else {
6327                 if (!PF_AZERO(&s->rt_addr, AF_INET))
6328                         dst.sin_addr.s_addr =
6329                             s->rt_addr.v4.s_addr;
6330                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6331                 PF_STATE_UNLOCK(s);
6332         }
6333         if (ifp == NULL)
6334                 goto bad;
6335
6336         if (dir == PF_IN) {
6337                 if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS)
6338                         goto bad;
6339                 else if (m0 == NULL)
6340                         goto done;
6341                 if (m0->m_len < sizeof(struct ip)) {
6342                         DPFPRINTF(PF_DEBUG_URGENT,
6343                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
6344                         goto bad;
6345                 }
6346                 ip = mtod(m0, struct ip *);
6347         }
6348
6349         if (ifp->if_flags & IFF_LOOPBACK)
6350                 m0->m_flags |= M_SKIP_FIREWALL;
6351
6352         ip_len = ntohs(ip->ip_len);
6353         ip_off = ntohs(ip->ip_off);
6354
6355         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
6356         m0->m_pkthdr.csum_flags |= CSUM_IP;
6357         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
6358                 in_delayed_cksum(m0);
6359                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
6360         }
6361 #if defined(SCTP) || defined(SCTP_SUPPORT)
6362         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
6363                 sctp_delayed_cksum(m0, (uint32_t)(ip->ip_hl << 2));
6364                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
6365         }
6366 #endif
6367
6368         /*
6369          * If small enough for interface, or the interface will take
6370          * care of the fragmentation for us, we can just send directly.
6371          */
6372         if (ip_len <= ifp->if_mtu ||
6373             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
6374                 ip->ip_sum = 0;
6375                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
6376                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
6377                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
6378                 }
6379                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
6380                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
6381                 goto done;
6382         }
6383
6384         /* Balk when DF bit is set or the interface didn't support TSO. */
6385         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
6386                 error = EMSGSIZE;
6387                 KMOD_IPSTAT_INC(ips_cantfrag);
6388                 if (r->rt != PF_DUPTO) {
6389                         if (s && pd->nat_rule != NULL)
6390                                 PACKET_UNDO_NAT(m0, pd,
6391                                     (ip->ip_hl << 2) + (ip_off & IP_OFFMASK),
6392                                     s, dir);
6393
6394                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
6395                             ifp->if_mtu);
6396                         goto done;
6397                 } else
6398                         goto bad;
6399         }
6400
6401         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
6402         if (error)
6403                 goto bad;
6404
6405         for (; m0; m0 = m1) {
6406                 m1 = m0->m_nextpkt;
6407                 m0->m_nextpkt = NULL;
6408                 if (error == 0) {
6409                         m_clrprotoflags(m0);
6410                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
6411                 } else
6412                         m_freem(m0);
6413         }
6414
6415         if (error == 0)
6416                 KMOD_IPSTAT_INC(ips_fragmented);
6417
6418 done:
6419         if (r->rt != PF_DUPTO)
6420                 *m = NULL;
6421         return;
6422
6423 bad_locked:
6424         if (s)
6425                 PF_STATE_UNLOCK(s);
6426 bad:
6427         m_freem(m0);
6428         goto done;
6429 }
6430 #endif /* INET */
6431
6432 #ifdef INET6
6433 static void
6434 pf_route6(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp,
6435     struct pf_kstate *s, struct pf_pdesc *pd, struct inpcb *inp)
6436 {
6437         struct mbuf             *m0;
6438         struct sockaddr_in6     dst;
6439         struct ip6_hdr          *ip6;
6440         struct ifnet            *ifp = NULL;
6441         struct pf_addr           naddr;
6442         struct pf_ksrc_node     *sn = NULL;
6443
6444         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
6445         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
6446             __func__));
6447
6448         if ((pd->pf_mtag == NULL &&
6449             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
6450             pd->pf_mtag->routed++ > 3) {
6451                 m0 = *m;
6452                 *m = NULL;
6453                 goto bad_locked;
6454         }
6455
6456         if (r->rt == PF_DUPTO) {
6457                 if ((pd->pf_mtag->flags & PF_DUPLICATED)) {
6458                         if (s == NULL) {
6459                                 ifp = r->rpool.cur->kif ?
6460                                     r->rpool.cur->kif->pfik_ifp : NULL;
6461                         } else {
6462                                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6463                                 PF_STATE_UNLOCK(s);
6464                         }
6465                         if (ifp == oifp) {
6466                                 /* When the 2nd interface is not skipped */
6467                                 return;
6468                         } else {
6469                                 m0 = *m;
6470                                 *m = NULL;
6471                                 goto bad;
6472                         }
6473                 } else {
6474                         pd->pf_mtag->flags |= PF_DUPLICATED;
6475                         if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) {
6476                                 if (s)
6477                                         PF_STATE_UNLOCK(s);
6478                                 return;
6479                         }
6480                 }
6481         } else {
6482                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
6483                         if (s)
6484                                 PF_STATE_UNLOCK(s);
6485                         return;
6486                 }
6487                 m0 = *m;
6488         }
6489
6490         ip6 = mtod(m0, struct ip6_hdr *);
6491
6492         bzero(&dst, sizeof(dst));
6493         dst.sin6_family = AF_INET6;
6494         dst.sin6_len = sizeof(dst);
6495         dst.sin6_addr = ip6->ip6_dst;
6496
6497         bzero(&naddr, sizeof(naddr));
6498
6499         if (s == NULL) {
6500                 if (TAILQ_EMPTY(&r->rpool.list)) {
6501                         DPFPRINTF(PF_DEBUG_URGENT,
6502                             ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
6503                         goto bad_locked;
6504                 }
6505                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
6506                     &naddr, NULL, &sn);
6507                 if (!PF_AZERO(&naddr, AF_INET6))
6508                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
6509                             &naddr, AF_INET6);
6510                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
6511         } else {
6512                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
6513                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
6514                             &s->rt_addr, AF_INET6);
6515                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
6516         }
6517
6518         if (s)
6519                 PF_STATE_UNLOCK(s);
6520
6521         if (ifp == NULL)
6522                 goto bad;
6523
6524         if (dir == PF_IN) {
6525                 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp) != PF_PASS)
6526                         goto bad;
6527                 else if (m0 == NULL)
6528                         goto done;
6529                 if (m0->m_len < sizeof(struct ip6_hdr)) {
6530                         DPFPRINTF(PF_DEBUG_URGENT,
6531                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
6532                             __func__));
6533                         goto bad;
6534                 }
6535                 ip6 = mtod(m0, struct ip6_hdr *);
6536         }
6537
6538         if (ifp->if_flags & IFF_LOOPBACK)
6539                 m0->m_flags |= M_SKIP_FIREWALL;
6540
6541         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
6542             ~ifp->if_hwassist) {
6543                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
6544                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
6545                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
6546         }
6547
6548         /*
6549          * If the packet is too large for the outgoing interface,
6550          * send back an icmp6 error.
6551          */
6552         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
6553                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
6554         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
6555                 nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
6556         else {
6557                 in6_ifstat_inc(ifp, ifs6_in_toobig);
6558                 if (r->rt != PF_DUPTO) {
6559                         if (s && pd->nat_rule != NULL)
6560                                 PACKET_UNDO_NAT(m0, pd,
6561                                     ((caddr_t)ip6 - m0->m_data) +
6562                                     sizeof(struct ip6_hdr), s, dir);
6563
6564                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
6565                 } else
6566                         goto bad;
6567         }
6568
6569 done:
6570         if (r->rt != PF_DUPTO)
6571                 *m = NULL;
6572         return;
6573
6574 bad_locked:
6575         if (s)
6576                 PF_STATE_UNLOCK(s);
6577 bad:
6578         m_freem(m0);
6579         goto done;
6580 }
6581 #endif /* INET6 */
6582
6583 /*
6584  * FreeBSD supports cksum offloads for the following drivers.
6585  *  em(4), fxp(4), lge(4), nge(4), re(4), ti(4), txp(4), xl(4)
6586  *
6587  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
6588  *  network driver performed cksum including pseudo header, need to verify
6589  *   csum_data
6590  * CSUM_DATA_VALID :
6591  *  network driver performed cksum, needs to additional pseudo header
6592  *  cksum computation with partial csum_data(i.e. lack of H/W support for
6593  *  pseudo header, for instance sk(4) and possibly gem(4))
6594  *
6595  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
6596  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
6597  * TCP/UDP layer.
6598  * Also, set csum_data to 0xffff to force cksum validation.
6599  */
6600 static int
6601 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
6602 {
6603         u_int16_t sum = 0;
6604         int hw_assist = 0;
6605         struct ip *ip;
6606
6607         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
6608                 return (1);
6609         if (m->m_pkthdr.len < off + len)
6610                 return (1);
6611
6612         switch (p) {
6613         case IPPROTO_TCP:
6614                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
6615                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
6616                                 sum = m->m_pkthdr.csum_data;
6617                         } else {
6618                                 ip = mtod(m, struct ip *);
6619                                 sum = in_pseudo(ip->ip_src.s_addr,
6620                                 ip->ip_dst.s_addr, htonl((u_short)len +
6621                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
6622                         }
6623                         sum ^= 0xffff;
6624                         ++hw_assist;
6625                 }
6626                 break;
6627         case IPPROTO_UDP:
6628                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
6629                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
6630                                 sum = m->m_pkthdr.csum_data;
6631                         } else {
6632                                 ip = mtod(m, struct ip *);
6633                                 sum = in_pseudo(ip->ip_src.s_addr,
6634                                 ip->ip_dst.s_addr, htonl((u_short)len +
6635                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
6636                         }
6637                         sum ^= 0xffff;
6638                         ++hw_assist;
6639                 }
6640                 break;
6641         case IPPROTO_ICMP:
6642 #ifdef INET6
6643         case IPPROTO_ICMPV6:
6644 #endif /* INET6 */
6645                 break;
6646         default:
6647                 return (1);
6648         }
6649
6650         if (!hw_assist) {
6651                 switch (af) {
6652                 case AF_INET:
6653                         if (p == IPPROTO_ICMP) {
6654                                 if (m->m_len < off)
6655                                         return (1);
6656                                 m->m_data += off;
6657                                 m->m_len -= off;
6658                                 sum = in_cksum(m, len);
6659                                 m->m_data -= off;
6660                                 m->m_len += off;
6661                         } else {
6662                                 if (m->m_len < sizeof(struct ip))
6663                                         return (1);
6664                                 sum = in4_cksum(m, p, off, len);
6665                         }
6666                         break;
6667 #ifdef INET6
6668                 case AF_INET6:
6669                         if (m->m_len < sizeof(struct ip6_hdr))
6670                                 return (1);
6671                         sum = in6_cksum(m, p, off, len);
6672                         break;
6673 #endif /* INET6 */
6674                 default:
6675                         return (1);
6676                 }
6677         }
6678         if (sum) {
6679                 switch (p) {
6680                 case IPPROTO_TCP:
6681                     {
6682                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
6683                         break;
6684                     }
6685                 case IPPROTO_UDP:
6686                     {
6687                         KMOD_UDPSTAT_INC(udps_badsum);
6688                         break;
6689                     }
6690 #ifdef INET
6691                 case IPPROTO_ICMP:
6692                     {
6693                         KMOD_ICMPSTAT_INC(icps_checksum);
6694                         break;
6695                     }
6696 #endif
6697 #ifdef INET6
6698                 case IPPROTO_ICMPV6:
6699                     {
6700                         KMOD_ICMP6STAT_INC(icp6s_checksum);
6701                         break;
6702                     }
6703 #endif /* INET6 */
6704                 }
6705                 return (1);
6706         } else {
6707                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
6708                         m->m_pkthdr.csum_flags |=
6709                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
6710                         m->m_pkthdr.csum_data = 0xffff;
6711                 }
6712         }
6713         return (0);
6714 }
6715
6716 static bool
6717 pf_pdesc_to_dnflow(int dir, const struct pf_pdesc *pd,
6718     const struct pf_krule *r, const struct pf_kstate *s,
6719     struct ip_fw_args *dnflow)
6720 {
6721         int dndir = r->direction;
6722
6723         if (s && dndir == PF_INOUT) {
6724                 dndir = s->direction;
6725         } else if (dndir == PF_INOUT) {
6726                 /* Assume primary direction. Happens when we've set dnpipe in
6727                  * the ethernet level code. */
6728                 dndir = dir;
6729         }
6730
6731         memset(dnflow, 0, sizeof(*dnflow));
6732
6733         if (pd->dport != NULL)
6734                 dnflow->f_id.dst_port = ntohs(*pd->dport);
6735         if (pd->sport != NULL)
6736                 dnflow->f_id.src_port = ntohs(*pd->sport);
6737
6738         if (dir == PF_IN)
6739                 dnflow->flags |= IPFW_ARGS_IN;
6740         else
6741                 dnflow->flags |= IPFW_ARGS_OUT;
6742
6743         if (dir != dndir && pd->act.dnrpipe) {
6744                 dnflow->rule.info = pd->act.dnrpipe;
6745         }
6746         else if (dir == dndir) {
6747                 dnflow->rule.info = pd->act.dnpipe;
6748         }
6749         else {
6750                 return (false);
6751         }
6752
6753         dnflow->rule.info |= IPFW_IS_DUMMYNET;
6754         if (r->free_flags & PFRULE_DN_IS_PIPE || pd->act.flags & PFRULE_DN_IS_PIPE)
6755                 dnflow->rule.info |= IPFW_IS_PIPE;
6756
6757         dnflow->f_id.proto = pd->proto;
6758         dnflow->f_id.extra = dnflow->rule.info;
6759         switch (pd->af) {
6760         case AF_INET:
6761                 dnflow->f_id.addr_type = 4;
6762                 dnflow->f_id.src_ip = ntohl(pd->src->v4.s_addr);
6763                 dnflow->f_id.dst_ip = ntohl(pd->dst->v4.s_addr);
6764                 break;
6765         case AF_INET6:
6766                 dnflow->flags |= IPFW_ARGS_IP6;
6767                 dnflow->f_id.addr_type = 6;
6768                 dnflow->f_id.src_ip6 = pd->src->v6;
6769                 dnflow->f_id.dst_ip6 = pd->dst->v6;
6770                 break;
6771         default:
6772                 panic("Invalid AF");
6773                 break;
6774         }
6775
6776         return (true);
6777 }
6778
6779 int
6780 pf_test_eth(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0,
6781     struct inpcb *inp)
6782 {
6783         struct pfi_kkif         *kif;
6784         struct mbuf             *m = *m0;
6785
6786         M_ASSERTPKTHDR(m);
6787         MPASS(ifp->if_vnet == curvnet);
6788         NET_EPOCH_ASSERT();
6789
6790         if (!V_pf_status.running)
6791                 return (PF_PASS);
6792
6793         kif = (struct pfi_kkif *)ifp->if_pf_kif;
6794
6795         if (kif == NULL) {
6796                 DPFPRINTF(PF_DEBUG_URGENT,
6797                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
6798                 return (PF_DROP);
6799         }
6800         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6801                 return (PF_PASS);
6802
6803         if (m->m_flags & M_SKIP_FIREWALL)
6804                 return (PF_PASS);
6805
6806         /* Stateless! */
6807         return (pf_test_eth_rule(dir, kif, m0));
6808 }
6809
6810 #ifdef INET
6811 int
6812 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6813 {
6814         struct pfi_kkif         *kif;
6815         u_short                  action, reason = 0, log = 0;
6816         struct mbuf             *m = *m0;
6817         struct ip               *h = NULL;
6818         struct m_tag            *ipfwtag;
6819         struct pf_krule         *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6820         struct pf_kstate        *s = NULL;
6821         struct pf_kruleset      *ruleset = NULL;
6822         struct pf_pdesc          pd;
6823         int                      off, dirndx, pqid = 0;
6824
6825         PF_RULES_RLOCK_TRACKER;
6826         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir));
6827         M_ASSERTPKTHDR(m);
6828
6829         if (!V_pf_status.running)
6830                 return (PF_PASS);
6831
6832         kif = (struct pfi_kkif *)ifp->if_pf_kif;
6833
6834         if (kif == NULL) {
6835                 DPFPRINTF(PF_DEBUG_URGENT,
6836                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
6837                 return (PF_DROP);
6838         }
6839         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6840                 return (PF_PASS);
6841
6842         if (m->m_flags & M_SKIP_FIREWALL)
6843                 return (PF_PASS);
6844
6845         memset(&pd, 0, sizeof(pd));
6846         pd.pf_mtag = pf_find_mtag(m);
6847
6848         if (pd.pf_mtag && pd.pf_mtag->dnpipe) {
6849                 pd.act.dnpipe = pd.pf_mtag->dnpipe;
6850                 pd.act.flags = pd.pf_mtag->dnflags;
6851         }
6852
6853         if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL &&
6854             pd.pf_mtag->flags & PF_TAG_DUMMYNET) {
6855                 /* Dummynet re-injects packets after they've
6856                  * completed their delay. We've already
6857                  * processed them, so pass unconditionally. */
6858
6859                 /* But only once. We may see the packet multiple times (e.g.
6860                  * PFIL_IN/PFIL_OUT). */
6861                 pd.pf_mtag->flags &= ~PF_TAG_DUMMYNET;
6862
6863                 return (PF_PASS);
6864         }
6865
6866         PF_RULES_RLOCK();
6867
6868         if (__predict_false(ip_divert_ptr != NULL) &&
6869             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
6870                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
6871                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
6872                         if (pd.pf_mtag == NULL &&
6873                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6874                                 action = PF_DROP;
6875                                 goto done;
6876                         }
6877                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
6878                         m_tag_delete(m, ipfwtag);
6879                 }
6880                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
6881                         m->m_flags |= M_FASTFWD_OURS;
6882                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
6883                 }
6884         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
6885                 /* We do IP header normalization and packet reassembly here */
6886                 action = PF_DROP;
6887                 goto done;
6888         }
6889         m = *m0;        /* pf_normalize messes with m0 */
6890         h = mtod(m, struct ip *);
6891
6892         off = h->ip_hl << 2;
6893         if (off < (int)sizeof(struct ip)) {
6894                 action = PF_DROP;
6895                 REASON_SET(&reason, PFRES_SHORT);
6896                 log = 1;
6897                 goto done;
6898         }
6899
6900         pd.src = (struct pf_addr *)&h->ip_src;
6901         pd.dst = (struct pf_addr *)&h->ip_dst;
6902         pd.sport = pd.dport = NULL;
6903         pd.ip_sum = &h->ip_sum;
6904         pd.proto_sum = NULL;
6905         pd.proto = h->ip_p;
6906         pd.dir = dir;
6907         pd.sidx = (dir == PF_IN) ? 0 : 1;
6908         pd.didx = (dir == PF_IN) ? 1 : 0;
6909         pd.af = AF_INET;
6910         pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
6911         pd.tot_len = ntohs(h->ip_len);
6912
6913         /* handle fragments that didn't get reassembled by normalization */
6914         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
6915                 action = pf_test_fragment(&r, dir, kif, m, h,
6916                     &pd, &a, &ruleset);
6917                 goto done;
6918         }
6919
6920         switch (h->ip_p) {
6921         case IPPROTO_TCP: {
6922                 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp),
6923                     &action, &reason, AF_INET)) {
6924                         log = action != PF_PASS;
6925                         goto done;
6926                 }
6927                 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2);
6928
6929                 pd.sport = &pd.hdr.tcp.th_sport;
6930                 pd.dport = &pd.hdr.tcp.th_dport;
6931
6932                 /* Respond to SYN with a syncookie. */
6933                 if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) == TH_SYN &&
6934                     pd.dir == PF_IN && pf_synflood_check(&pd)) {
6935                         pf_syncookie_send(m, off, &pd);
6936                         action = PF_DROP;
6937                         break;
6938                 }
6939
6940                 if ((pd.hdr.tcp.th_flags & TH_ACK) && pd.p_len == 0)
6941                         pqid = 1;
6942                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6943                 if (action == PF_DROP)
6944                         goto done;
6945                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6946                     &reason);
6947                 if (action == PF_PASS) {
6948                         if (V_pfsync_update_state_ptr != NULL)
6949                                 V_pfsync_update_state_ptr(s);
6950                         r = s->rule.ptr;
6951                         a = s->anchor.ptr;
6952                         log = s->log;
6953                 } else if (s == NULL) {
6954                         /* Validate remote SYN|ACK, re-create original SYN if
6955                          * valid. */
6956                         if ((pd.hdr.tcp.th_flags & (TH_SYN|TH_ACK|TH_RST)) ==
6957                             TH_ACK && pf_syncookie_validate(&pd) &&
6958                             pd.dir == PF_IN) {
6959                                 struct mbuf *msyn;
6960
6961                                 msyn = pf_syncookie_recreate_syn(h->ip_ttl,
6962                                     off,&pd);
6963                                 if (msyn == NULL) {
6964                                         action = PF_DROP;
6965                                         break;
6966                                 }
6967
6968                                 action = pf_test(dir, pflags, ifp, &msyn, inp);
6969                                 m_freem(msyn);
6970
6971                                 if (action == PF_PASS) {
6972                                         action = pf_test_state_tcp(&s, dir,
6973                                             kif, m, off, h, &pd, &reason);
6974                                         if (action != PF_PASS || s == NULL) {
6975                                                 action = PF_DROP;
6976                                                 break;
6977                                         }
6978
6979                                         s->src.seqhi = ntohl(pd.hdr.tcp.th_ack)
6980                                             - 1;
6981                                         s->src.seqlo = ntohl(pd.hdr.tcp.th_seq)
6982                                             - 1;
6983                                         pf_set_protostate(s, PF_PEER_SRC,
6984                                             PF_TCPS_PROXY_DST);
6985
6986                                         action = pf_synproxy(&pd, &s, &reason);
6987                                         if (action != PF_PASS)
6988                                                 break;
6989                                 }
6990                                 break;
6991                         }
6992                         else {
6993                                 action = pf_test_rule(&r, &s, dir, kif, m, off,
6994                                     &pd, &a, &ruleset, inp);
6995                         }
6996                 }
6997                 break;
6998         }
6999
7000         case IPPROTO_UDP: {
7001                 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp),
7002                     &action, &reason, AF_INET)) {
7003                         log = action != PF_PASS;
7004                         goto done;
7005                 }
7006                 pd.sport = &pd.hdr.udp.uh_sport;
7007                 pd.dport = &pd.hdr.udp.uh_dport;
7008                 if (pd.hdr.udp.uh_dport == 0 ||
7009                     ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off ||
7010                     ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) {
7011                         action = PF_DROP;
7012                         REASON_SET(&reason, PFRES_SHORT);
7013                         goto done;
7014                 }
7015                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
7016                 if (action == PF_PASS) {
7017                         if (V_pfsync_update_state_ptr != NULL)
7018                                 V_pfsync_update_state_ptr(s);
7019                         r = s->rule.ptr;
7020                         a = s->anchor.ptr;
7021                         log = s->log;
7022                 } else if (s == NULL)
7023                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7024                             &a, &ruleset, inp);
7025                 break;
7026         }
7027
7028         case IPPROTO_ICMP: {
7029                 if (!pf_pull_hdr(m, off, &pd.hdr.icmp, ICMP_MINLEN,
7030                     &action, &reason, AF_INET)) {
7031                         log = action != PF_PASS;
7032                         goto done;
7033                 }
7034                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
7035                     &reason);
7036                 if (action == PF_PASS) {
7037                         if (V_pfsync_update_state_ptr != NULL)
7038                                 V_pfsync_update_state_ptr(s);
7039                         r = s->rule.ptr;
7040                         a = s->anchor.ptr;
7041                         log = s->log;
7042                 } else if (s == NULL)
7043                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7044                             &a, &ruleset, inp);
7045                 break;
7046         }
7047
7048 #ifdef INET6
7049         case IPPROTO_ICMPV6: {
7050                 action = PF_DROP;
7051                 DPFPRINTF(PF_DEBUG_MISC,
7052                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
7053                 goto done;
7054         }
7055 #endif
7056
7057         default:
7058                 action = pf_test_state_other(&s, dir, kif, m, &pd);
7059                 if (action == PF_PASS) {
7060                         if (V_pfsync_update_state_ptr != NULL)
7061                                 V_pfsync_update_state_ptr(s);
7062                         r = s->rule.ptr;
7063                         a = s->anchor.ptr;
7064                         log = s->log;
7065                 } else if (s == NULL)
7066                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7067                             &a, &ruleset, inp);
7068                 break;
7069         }
7070
7071 done:
7072         PF_RULES_RUNLOCK();
7073         if (action == PF_PASS && h->ip_hl > 5 &&
7074             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
7075                 action = PF_DROP;
7076                 REASON_SET(&reason, PFRES_IPOPTIONS);
7077                 log = r->log;
7078                 DPFPRINTF(PF_DEBUG_MISC,
7079                     ("pf: dropping packet with ip options\n"));
7080         }
7081
7082         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
7083                 action = PF_DROP;
7084                 REASON_SET(&reason, PFRES_MEMORY);
7085         }
7086         if (r->rtableid >= 0)
7087                 M_SETFIB(m, r->rtableid);
7088
7089         if (r->scrub_flags & PFSTATE_SETPRIO) {
7090                 if (pd.tos & IPTOS_LOWDELAY)
7091                         pqid = 1;
7092                 if (vlan_set_pcp(m, r->set_prio[pqid])) {
7093                         action = PF_DROP;
7094                         REASON_SET(&reason, PFRES_MEMORY);
7095                         log = 1;
7096                         DPFPRINTF(PF_DEBUG_MISC,
7097                             ("pf: failed to allocate 802.1q mtag\n"));
7098                 }
7099         }
7100
7101 #ifdef ALTQ
7102         if (s && s->qid) {
7103                 pd.act.pqid = s->pqid;
7104                 pd.act.qid = s->qid;
7105         } else if (r->qid) {
7106                 pd.act.pqid = r->pqid;
7107                 pd.act.qid = r->qid;
7108         }
7109         if (action == PF_PASS && pd.act.qid) {
7110                 if (pd.pf_mtag == NULL &&
7111                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
7112                         action = PF_DROP;
7113                         REASON_SET(&reason, PFRES_MEMORY);
7114                 } else {
7115                         if (s != NULL)
7116                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
7117                         if (pqid || (pd.tos & IPTOS_LOWDELAY))
7118                                 pd.pf_mtag->qid = pd.act.pqid;
7119                         else
7120                                 pd.pf_mtag->qid = pd.act.qid;
7121                         /* Add hints for ecn. */
7122                         pd.pf_mtag->hdr = h;
7123                 }
7124         }
7125 #endif /* ALTQ */
7126
7127         /*
7128          * connections redirected to loopback should not match sockets
7129          * bound specifically to loopback due to security implications,
7130          * see tcp_input() and in_pcblookup_listen().
7131          */
7132         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
7133             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
7134             (s->nat_rule.ptr->action == PF_RDR ||
7135             s->nat_rule.ptr->action == PF_BINAT) &&
7136             IN_LOOPBACK(ntohl(pd.dst->v4.s_addr)))
7137                 m->m_flags |= M_SKIP_FIREWALL;
7138
7139         if (__predict_false(ip_divert_ptr != NULL) && action == PF_PASS &&
7140             r->divert.port && !PACKET_LOOPED(&pd)) {
7141                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
7142                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
7143                 if (ipfwtag != NULL) {
7144                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
7145                             ntohs(r->divert.port);
7146                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
7147
7148                         if (s)
7149                                 PF_STATE_UNLOCK(s);
7150
7151                         m_tag_prepend(m, ipfwtag);
7152                         if (m->m_flags & M_FASTFWD_OURS) {
7153                                 if (pd.pf_mtag == NULL &&
7154                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
7155                                         action = PF_DROP;
7156                                         REASON_SET(&reason, PFRES_MEMORY);
7157                                         log = 1;
7158                                         DPFPRINTF(PF_DEBUG_MISC,
7159                                             ("pf: failed to allocate tag\n"));
7160                                 } else {
7161                                         pd.pf_mtag->flags |=
7162                                             PF_FASTFWD_OURS_PRESENT;
7163                                         m->m_flags &= ~M_FASTFWD_OURS;
7164                                 }
7165                         }
7166                         ip_divert_ptr(*m0, dir == PF_IN);
7167                         *m0 = NULL;
7168
7169                         return (action);
7170                 } else {
7171                         /* XXX: ipfw has the same behaviour! */
7172                         action = PF_DROP;
7173                         REASON_SET(&reason, PFRES_MEMORY);
7174                         log = 1;
7175                         DPFPRINTF(PF_DEBUG_MISC,
7176                             ("pf: failed to allocate divert tag\n"));
7177                 }
7178         }
7179
7180         if (log) {
7181                 struct pf_krule *lr;
7182
7183                 if (s != NULL && s->nat_rule.ptr != NULL &&
7184                     s->nat_rule.ptr->log & PF_LOG_ALL)
7185                         lr = s->nat_rule.ptr;
7186                 else
7187                         lr = r;
7188                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
7189                     (s == NULL));
7190         }
7191
7192         pf_counter_u64_critical_enter();
7193         pf_counter_u64_add_protected(&kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS],
7194             pd.tot_len);
7195         pf_counter_u64_add_protected(&kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS],
7196             1);
7197
7198         if (action == PF_PASS || r->action == PF_DROP) {
7199                 dirndx = (dir == PF_OUT);
7200                 pf_counter_u64_add_protected(&r->packets[dirndx], 1);
7201                 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len);
7202                 pf_update_timestamp(r);
7203
7204                 if (a != NULL) {
7205                         pf_counter_u64_add_protected(&a->packets[dirndx], 1);
7206                         pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len);
7207                 }
7208                 if (s != NULL) {
7209                         if (s->nat_rule.ptr != NULL) {
7210                                 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx],
7211                                     1);
7212                                 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx],
7213                                     pd.tot_len);
7214                         }
7215                         if (s->src_node != NULL) {
7216                                 counter_u64_add(s->src_node->packets[dirndx],
7217                                     1);
7218                                 counter_u64_add(s->src_node->bytes[dirndx],
7219                                     pd.tot_len);
7220                         }
7221                         if (s->nat_src_node != NULL) {
7222                                 counter_u64_add(s->nat_src_node->packets[dirndx],
7223                                     1);
7224                                 counter_u64_add(s->nat_src_node->bytes[dirndx],
7225                                     pd.tot_len);
7226                         }
7227                         dirndx = (dir == s->direction) ? 0 : 1;
7228                         s->packets[dirndx]++;
7229                         s->bytes[dirndx] += pd.tot_len;
7230                 }
7231                 tr = r;
7232                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
7233                 if (nr != NULL && r == &V_pf_default_rule)
7234                         tr = nr;
7235                 if (tr->src.addr.type == PF_ADDR_TABLE)
7236                         pfr_update_stats(tr->src.addr.p.tbl,
7237                             (s == NULL) ? pd.src :
7238                             &s->key[(s->direction == PF_IN)]->
7239                                 addr[(s->direction == PF_OUT)],
7240                             pd.af, pd.tot_len, dir == PF_OUT,
7241                             r->action == PF_PASS, tr->src.neg);
7242                 if (tr->dst.addr.type == PF_ADDR_TABLE)
7243                         pfr_update_stats(tr->dst.addr.p.tbl,
7244                             (s == NULL) ? pd.dst :
7245                             &s->key[(s->direction == PF_IN)]->
7246                                 addr[(s->direction == PF_IN)],
7247                             pd.af, pd.tot_len, dir == PF_OUT,
7248                             r->action == PF_PASS, tr->dst.neg);
7249         }
7250         pf_counter_u64_critical_exit();
7251
7252         switch (action) {
7253         case PF_SYNPROXY_DROP:
7254                 m_freem(*m0);
7255         case PF_DEFER:
7256                 *m0 = NULL;
7257                 action = PF_PASS;
7258                 break;
7259         case PF_DROP:
7260                 m_freem(*m0);
7261                 *m0 = NULL;
7262                 break;
7263         default:
7264                 /* pf_route() returns unlocked. */
7265                 if (r->rt) {
7266                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
7267                         return (action);
7268                 }
7269                 /* Dummynet processing. */
7270                 if (s && (s->dnpipe || s->dnrpipe)) {
7271                         pd.act.dnpipe = s->dnpipe;
7272                         pd.act.dnrpipe = s->dnrpipe;
7273                         pd.act.flags = s->state_flags;
7274                 } else if (r->dnpipe || r->dnrpipe) {
7275                         pd.act.dnpipe = r->dnpipe;
7276                         pd.act.dnrpipe = r->dnrpipe;
7277                         pd.act.flags = r->free_flags;
7278                 }
7279                 if (pd.act.dnpipe || pd.act.dnrpipe) {
7280                         struct ip_fw_args dnflow;
7281                         if (ip_dn_io_ptr == NULL) {
7282                                 m_freem(*m0);
7283                                 *m0 = NULL;
7284                                 action = PF_DROP;
7285                                 REASON_SET(&reason, PFRES_MEMORY);
7286                                 break;
7287                         }
7288
7289                         if (pd.pf_mtag == NULL &&
7290                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
7291                                 m_freem(*m0);
7292                                 *m0 = NULL;
7293                                 action = PF_DROP;
7294                                 REASON_SET(&reason, PFRES_MEMORY);
7295                                 break;
7296                         }
7297
7298                         if (pf_pdesc_to_dnflow(dir, &pd, r, s, &dnflow)) {
7299                                 pd.pf_mtag->flags |= PF_TAG_DUMMYNET;
7300                                 ip_dn_io_ptr(m0, &dnflow);
7301                                 if (*m0 == NULL)
7302                                         action = PF_DROP;
7303                         }
7304                 }
7305                 break;
7306         }
7307
7308         SDT_PROBE4(pf, ip, test, done, action, reason, r, s);
7309
7310         if (s)
7311                 PF_STATE_UNLOCK(s);
7312
7313         return (action);
7314 }
7315 #endif /* INET */
7316
7317 #ifdef INET6
7318 int
7319 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
7320 {
7321         struct pfi_kkif         *kif;
7322         u_short                  action, reason = 0, log = 0;
7323         struct mbuf             *m = *m0, *n = NULL;
7324         struct m_tag            *mtag;
7325         struct ip6_hdr          *h = NULL;
7326         struct pf_krule         *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
7327         struct pf_kstate        *s = NULL;
7328         struct pf_kruleset      *ruleset = NULL;
7329         struct pf_pdesc          pd;
7330         int                      off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
7331
7332         PF_RULES_RLOCK_TRACKER;
7333         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: bad direction %d\n", __func__, dir));
7334         M_ASSERTPKTHDR(m);
7335
7336         if (!V_pf_status.running)
7337                 return (PF_PASS);
7338
7339         kif = (struct pfi_kkif *)ifp->if_pf_kif;
7340         if (kif == NULL) {
7341                 DPFPRINTF(PF_DEBUG_URGENT,
7342                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
7343                 return (PF_DROP);
7344         }
7345         if (kif->pfik_flags & PFI_IFLAG_SKIP)
7346                 return (PF_PASS);
7347
7348         if (m->m_flags & M_SKIP_FIREWALL)
7349                 return (PF_PASS);
7350
7351         memset(&pd, 0, sizeof(pd));
7352         pd.pf_mtag = pf_find_mtag(m);
7353
7354         if (pd.pf_mtag && pd.pf_mtag->dnpipe) {
7355                 pd.act.dnpipe = pd.pf_mtag->dnpipe;
7356                 pd.act.flags = pd.pf_mtag->dnflags;
7357         }
7358
7359         if (ip_dn_io_ptr != NULL && pd.pf_mtag != NULL &&
7360             pd.pf_mtag->flags & PF_TAG_DUMMYNET) {
7361                 pd.pf_mtag->flags &= ~PF_TAG_DUMMYNET;
7362                 /* Dummynet re-injects packets after they've
7363                  * completed their delay. We've already
7364                  * processed them, so pass unconditionally. */
7365                 return (PF_PASS);
7366         }
7367
7368         PF_RULES_RLOCK();
7369
7370         /* We do IP header normalization and packet reassembly here */
7371         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
7372                 action = PF_DROP;
7373                 goto done;
7374         }
7375         m = *m0;        /* pf_normalize messes with m0 */
7376         h = mtod(m, struct ip6_hdr *);
7377
7378         /*
7379          * we do not support jumbogram.  if we keep going, zero ip6_plen
7380          * will do something bad, so drop the packet for now.
7381          */
7382         if (htons(h->ip6_plen) == 0) {
7383                 action = PF_DROP;
7384                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
7385                 goto done;
7386         }
7387
7388         pd.src = (struct pf_addr *)&h->ip6_src;
7389         pd.dst = (struct pf_addr *)&h->ip6_dst;
7390         pd.sport = pd.dport = NULL;
7391         pd.ip_sum = NULL;
7392         pd.proto_sum = NULL;
7393         pd.dir = dir;
7394         pd.sidx = (dir == PF_IN) ? 0 : 1;
7395         pd.didx = (dir == PF_IN) ? 1 : 0;
7396         pd.af = AF_INET6;
7397         pd.tos = IPV6_DSCP(h);
7398         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
7399
7400         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
7401         pd.proto = h->ip6_nxt;
7402         do {
7403                 switch (pd.proto) {
7404                 case IPPROTO_FRAGMENT:
7405                         action = pf_test_fragment(&r, dir, kif, m, h,
7406                             &pd, &a, &ruleset);
7407                         if (action == PF_DROP)
7408                                 REASON_SET(&reason, PFRES_FRAG);
7409                         goto done;
7410                 case IPPROTO_ROUTING: {
7411                         struct ip6_rthdr rthdr;
7412
7413                         if (rh_cnt++) {
7414                                 DPFPRINTF(PF_DEBUG_MISC,
7415                                     ("pf: IPv6 more than one rthdr\n"));
7416                                 action = PF_DROP;
7417                                 REASON_SET(&reason, PFRES_IPOPTIONS);
7418                                 log = 1;
7419                                 goto done;
7420                         }
7421                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
7422                             &reason, pd.af)) {
7423                                 DPFPRINTF(PF_DEBUG_MISC,
7424                                     ("pf: IPv6 short rthdr\n"));
7425                                 action = PF_DROP;
7426                                 REASON_SET(&reason, PFRES_SHORT);
7427                                 log = 1;
7428                                 goto done;
7429                         }
7430                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
7431                                 DPFPRINTF(PF_DEBUG_MISC,
7432                                     ("pf: IPv6 rthdr0\n"));
7433                                 action = PF_DROP;
7434                                 REASON_SET(&reason, PFRES_IPOPTIONS);
7435                                 log = 1;
7436                                 goto done;
7437                         }
7438                         /* FALLTHROUGH */
7439                 }
7440                 case IPPROTO_AH:
7441                 case IPPROTO_HOPOPTS:
7442                 case IPPROTO_DSTOPTS: {
7443                         /* get next header and header length */
7444                         struct ip6_ext  opt6;
7445
7446                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
7447                             NULL, &reason, pd.af)) {
7448                                 DPFPRINTF(PF_DEBUG_MISC,
7449                                     ("pf: IPv6 short opt\n"));
7450                                 action = PF_DROP;
7451                                 log = 1;
7452                                 goto done;
7453                         }
7454                         if (pd.proto == IPPROTO_AH)
7455                                 off += (opt6.ip6e_len + 2) * 4;
7456                         else
7457                                 off += (opt6.ip6e_len + 1) * 8;
7458                         pd.proto = opt6.ip6e_nxt;
7459                         /* goto the next header */
7460                         break;
7461                 }
7462                 default:
7463                         terminal++;
7464                         break;
7465                 }
7466         } while (!terminal);
7467
7468         /* if there's no routing header, use unmodified mbuf for checksumming */
7469         if (!n)
7470                 n = m;
7471
7472         switch (pd.proto) {
7473         case IPPROTO_TCP: {
7474                 if (!pf_pull_hdr(m, off, &pd.hdr.tcp, sizeof(pd.hdr.tcp),
7475                     &action, &reason, AF_INET6)) {
7476                         log = action != PF_PASS;
7477                         goto done;
7478                 }
7479                 pd.p_len = pd.tot_len - off - (pd.hdr.tcp.th_off << 2);
7480                 pd.sport = &pd.hdr.tcp.th_sport;
7481                 pd.dport = &pd.hdr.tcp.th_dport;
7482                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
7483                 if (action == PF_DROP)
7484                         goto done;
7485                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
7486                     &reason);
7487                 if (action == PF_PASS) {
7488                         if (V_pfsync_update_state_ptr != NULL)
7489                                 V_pfsync_update_state_ptr(s);
7490                         r = s->rule.ptr;
7491                         a = s->anchor.ptr;
7492                         log = s->log;
7493                 } else if (s == NULL)
7494                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7495                             &a, &ruleset, inp);
7496                 break;
7497         }
7498
7499         case IPPROTO_UDP: {
7500                 if (!pf_pull_hdr(m, off, &pd.hdr.udp, sizeof(pd.hdr.udp),
7501                     &action, &reason, AF_INET6)) {
7502                         log = action != PF_PASS;
7503                         goto done;
7504                 }
7505                 pd.sport = &pd.hdr.udp.uh_sport;
7506                 pd.dport = &pd.hdr.udp.uh_dport;
7507                 if (pd.hdr.udp.uh_dport == 0 ||
7508                     ntohs(pd.hdr.udp.uh_ulen) > m->m_pkthdr.len - off ||
7509                     ntohs(pd.hdr.udp.uh_ulen) < sizeof(struct udphdr)) {
7510                         action = PF_DROP;
7511                         REASON_SET(&reason, PFRES_SHORT);
7512                         goto done;
7513                 }
7514                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
7515                 if (action == PF_PASS) {
7516                         if (V_pfsync_update_state_ptr != NULL)
7517                                 V_pfsync_update_state_ptr(s);
7518                         r = s->rule.ptr;
7519                         a = s->anchor.ptr;
7520                         log = s->log;
7521                 } else if (s == NULL)
7522                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7523                             &a, &ruleset, inp);
7524                 break;
7525         }
7526
7527         case IPPROTO_ICMP: {
7528                 action = PF_DROP;
7529                 DPFPRINTF(PF_DEBUG_MISC,
7530                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
7531                 goto done;
7532         }
7533
7534         case IPPROTO_ICMPV6: {
7535                 if (!pf_pull_hdr(m, off, &pd.hdr.icmp6, sizeof(pd.hdr.icmp6),
7536                     &action, &reason, AF_INET6)) {
7537                         log = action != PF_PASS;
7538                         goto done;
7539                 }
7540                 action = pf_test_state_icmp(&s, dir, kif,
7541                     m, off, h, &pd, &reason);
7542                 if (action == PF_PASS) {
7543                         if (V_pfsync_update_state_ptr != NULL)
7544                                 V_pfsync_update_state_ptr(s);
7545                         r = s->rule.ptr;
7546                         a = s->anchor.ptr;
7547                         log = s->log;
7548                 } else if (s == NULL)
7549                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7550                             &a, &ruleset, inp);
7551                 break;
7552         }
7553
7554         default:
7555                 action = pf_test_state_other(&s, dir, kif, m, &pd);
7556                 if (action == PF_PASS) {
7557                         if (V_pfsync_update_state_ptr != NULL)
7558                                 V_pfsync_update_state_ptr(s);
7559                         r = s->rule.ptr;
7560                         a = s->anchor.ptr;
7561                         log = s->log;
7562                 } else if (s == NULL)
7563                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
7564                             &a, &ruleset, inp);
7565                 break;
7566         }
7567
7568 done:
7569         PF_RULES_RUNLOCK();
7570         if (n != m) {
7571                 m_freem(n);
7572                 n = NULL;
7573         }
7574
7575         /* handle dangerous IPv6 extension headers. */
7576         if (action == PF_PASS && rh_cnt &&
7577             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
7578                 action = PF_DROP;
7579                 REASON_SET(&reason, PFRES_IPOPTIONS);
7580                 log = r->log;
7581                 DPFPRINTF(PF_DEBUG_MISC,
7582                     ("pf: dropping packet with dangerous v6 headers\n"));
7583         }
7584
7585         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
7586                 action = PF_DROP;
7587                 REASON_SET(&reason, PFRES_MEMORY);
7588         }
7589         if (r->rtableid >= 0)
7590                 M_SETFIB(m, r->rtableid);
7591
7592         if (r->scrub_flags & PFSTATE_SETPRIO) {
7593                 if (pd.tos & IPTOS_LOWDELAY)
7594                         pqid = 1;
7595                 if (vlan_set_pcp(m, r->set_prio[pqid])) {
7596                         action = PF_DROP;
7597                         REASON_SET(&reason, PFRES_MEMORY);
7598                         log = 1;
7599                         DPFPRINTF(PF_DEBUG_MISC,
7600                             ("pf: failed to allocate 802.1q mtag\n"));
7601                 }
7602         }
7603
7604 #ifdef ALTQ
7605         if (s && s->qid) {
7606                 pd.act.pqid = s->pqid;
7607                 pd.act.qid = s->qid;
7608         } else if (r->qid) {
7609                 pd.act.pqid = r->pqid;
7610                 pd.act.qid = r->qid;
7611         }
7612         if (action == PF_PASS && pd.act.qid) {
7613                 if (pd.pf_mtag == NULL &&
7614                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
7615                         action = PF_DROP;
7616                         REASON_SET(&reason, PFRES_MEMORY);
7617                 } else {
7618                         if (s != NULL)
7619                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
7620                         if (pd.tos & IPTOS_LOWDELAY)
7621                                 pd.pf_mtag->qid = pd.act.pqid;
7622                         else
7623                                 pd.pf_mtag->qid = pd.act.qid;
7624                         /* Add hints for ecn. */
7625                         pd.pf_mtag->hdr = h;
7626                 }
7627         }
7628 #endif /* ALTQ */
7629
7630         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
7631             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
7632             (s->nat_rule.ptr->action == PF_RDR ||
7633             s->nat_rule.ptr->action == PF_BINAT) &&
7634             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
7635                 m->m_flags |= M_SKIP_FIREWALL;
7636
7637         /* XXX: Anybody working on it?! */
7638         if (r->divert.port)
7639                 printf("pf: divert(9) is not supported for IPv6\n");
7640
7641         if (log) {
7642                 struct pf_krule *lr;
7643
7644                 if (s != NULL && s->nat_rule.ptr != NULL &&
7645                     s->nat_rule.ptr->log & PF_LOG_ALL)
7646                         lr = s->nat_rule.ptr;
7647                 else
7648                         lr = r;
7649                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
7650                     &pd, (s == NULL));
7651         }
7652
7653         pf_counter_u64_critical_enter();
7654         pf_counter_u64_add_protected(&kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS],
7655             pd.tot_len);
7656         pf_counter_u64_add_protected(&kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS],
7657             1);
7658
7659         if (action == PF_PASS || r->action == PF_DROP) {
7660                 dirndx = (dir == PF_OUT);
7661                 pf_counter_u64_add_protected(&r->packets[dirndx], 1);
7662                 pf_counter_u64_add_protected(&r->bytes[dirndx], pd.tot_len);
7663                 if (a != NULL) {
7664                         pf_counter_u64_add_protected(&a->packets[dirndx], 1);
7665                         pf_counter_u64_add_protected(&a->bytes[dirndx], pd.tot_len);
7666                 }
7667                 if (s != NULL) {
7668                         if (s->nat_rule.ptr != NULL) {
7669                                 pf_counter_u64_add_protected(&s->nat_rule.ptr->packets[dirndx],
7670                                     1);
7671                                 pf_counter_u64_add_protected(&s->nat_rule.ptr->bytes[dirndx],
7672                                     pd.tot_len);
7673                         }
7674                         if (s->src_node != NULL) {
7675                                 counter_u64_add(s->src_node->packets[dirndx],
7676                                     1);
7677                                 counter_u64_add(s->src_node->bytes[dirndx],
7678                                     pd.tot_len);
7679                         }
7680                         if (s->nat_src_node != NULL) {
7681                                 counter_u64_add(s->nat_src_node->packets[dirndx],
7682                                     1);
7683                                 counter_u64_add(s->nat_src_node->bytes[dirndx],
7684                                     pd.tot_len);
7685                         }
7686                         dirndx = (dir == s->direction) ? 0 : 1;
7687                         s->packets[dirndx]++;
7688                         s->bytes[dirndx] += pd.tot_len;
7689                 }
7690                 tr = r;
7691                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
7692                 if (nr != NULL && r == &V_pf_default_rule)
7693                         tr = nr;
7694                 if (tr->src.addr.type == PF_ADDR_TABLE)
7695                         pfr_update_stats(tr->src.addr.p.tbl,
7696                             (s == NULL) ? pd.src :
7697                             &s->key[(s->direction == PF_IN)]->addr[0],
7698                             pd.af, pd.tot_len, dir == PF_OUT,
7699                             r->action == PF_PASS, tr->src.neg);
7700                 if (tr->dst.addr.type == PF_ADDR_TABLE)
7701                         pfr_update_stats(tr->dst.addr.p.tbl,
7702                             (s == NULL) ? pd.dst :
7703                             &s->key[(s->direction == PF_IN)]->addr[1],
7704                             pd.af, pd.tot_len, dir == PF_OUT,
7705                             r->action == PF_PASS, tr->dst.neg);
7706         }
7707         pf_counter_u64_critical_exit();
7708
7709         switch (action) {
7710         case PF_SYNPROXY_DROP:
7711                 m_freem(*m0);
7712         case PF_DEFER:
7713                 *m0 = NULL;
7714                 action = PF_PASS;
7715                 break;
7716         case PF_DROP:
7717                 m_freem(*m0);
7718                 *m0 = NULL;
7719                 break;
7720         default:
7721                 /* pf_route6() returns unlocked. */
7722                 if (r->rt) {
7723                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
7724                         return (action);
7725                 }
7726                 /* Dummynet processing. */
7727                 if (s && (s->dnpipe || s->dnrpipe)) {
7728                         pd.act.dnpipe = s->dnpipe;
7729                         pd.act.dnrpipe = s->dnrpipe;
7730                         pd.act.flags = s->state_flags;
7731                 } else {
7732                         pd.act.dnpipe = r->dnpipe;
7733                         pd.act.dnrpipe = r->dnrpipe;
7734                         pd.act.flags = r->free_flags;
7735                 }
7736                 if (pd.act.dnpipe || pd.act.dnrpipe) {
7737                         struct ip_fw_args dnflow;
7738
7739                         if (ip_dn_io_ptr == NULL) {
7740                                 m_freem(*m0);
7741                                 *m0 = NULL;
7742                                 action = PF_DROP;
7743                                 REASON_SET(&reason, PFRES_MEMORY);
7744                                 break;
7745                         }
7746
7747                         if (pd.pf_mtag == NULL &&
7748                                         ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
7749                                 m_freem(*m0);
7750                                 *m0 = NULL;
7751                                 action = PF_DROP;
7752                                 REASON_SET(&reason, PFRES_MEMORY);
7753                                 break;
7754                         }
7755
7756                         if (pf_pdesc_to_dnflow(dir, &pd, r, s, &dnflow)) {
7757                                 pd.pf_mtag->flags |= PF_TAG_DUMMYNET;
7758                                 ip_dn_io_ptr(m0, &dnflow);
7759                                 if (*m0 == NULL)
7760                                         action = PF_DROP;
7761                         }
7762                 }
7763                 break;
7764         }
7765
7766         if (s)
7767                 PF_STATE_UNLOCK(s);
7768
7769         /* If reassembled packet passed, create new fragments. */
7770         if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) &&
7771             (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
7772                 action = pf_refragment6(ifp, m0, mtag);
7773
7774         SDT_PROBE4(pf, ip, test6, done, action, reason, r, s);
7775
7776         return (action);
7777 }
7778 #endif /* INET6 */