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