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