sys/netpfil/pf/pf.c

   1 /*-
   2  * Copyright (c) 2001 Daniel Hartmeier
   3  * Copyright (c) 2002 - 2008 Henning Brauer
   4  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  *    - Redistributions of source code must retain the above copyright
  12  *      notice, this list of conditions and the following disclaimer.
  13  *    - Redistributions in binary form must reproduce the above
  14  *      copyright notice, this list of conditions and the following
  15  *      disclaimer in the documentation and/or other materials provided
  16  *      with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  26  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  28  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * Effort sponsored in part by the Defense Advanced Research Projects
  32  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  33  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  34  *
  35  *      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "opt_inet.h"
  42 #include "opt_inet6.h"
  43 #include "opt_bpf.h"
  44 #include "opt_pf.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/bus.h>
  48 #include <sys/endian.h>
  49 #include <sys/hash.h>
  50 #include <sys/interrupt.h>
  51 #include <sys/kernel.h>
  52 #include <sys/kthread.h>
  53 #include <sys/limits.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/md5.h>
  56 #include <sys/random.h>
  57 #include <sys/refcount.h>
  58 #include <sys/socket.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/taskqueue.h>
  61 #include <sys/ucred.h>
  62
  63 #include <net/if.h>
  64 #include <net/if_types.h>
  65 #include <net/route.h>
  66 #include <net/radix_mpath.h>
  67 #include <net/vnet.h>
  68
  69 #include <net/pfvar.h>
  70 #include <net/pf_mtag.h>
  71 #include <net/if_pflog.h>
  72 #include <net/if_pfsync.h>
  73
  74 #include <netinet/in_pcb.h>
  75 #include <netinet/in_var.h>
  76 #include <netinet/ip.h>
  77 #include <netinet/ip_fw.h>
  78 #include <netinet/ip_icmp.h>
  79 #include <netinet/icmp_var.h>
  80 #include <netinet/ip_var.h>
  81 #include <netinet/tcp.h>
  82 #include <netinet/tcp_fsm.h>
  83 #include <netinet/tcp_seq.h>
  84 #include <netinet/tcp_timer.h>
  85 #include <netinet/tcp_var.h>
  86 #include <netinet/udp.h>
  87 #include <netinet/udp_var.h>
  88
  89 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
  90
  91 #ifdef INET6
  92 #include <netinet/ip6.h>
  93 #include <netinet/icmp6.h>
  94 #include <netinet6/nd6.h>
  95 #include <netinet6/ip6_var.h>
  96 #include <netinet6/in6_pcb.h>
  97 #endif /* INET6 */
  98
  99 #include <machine/in_cksum.h>
 100 #include <security/mac/mac_framework.h>
 101
 102 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 103
 104 /*
 105  * Global variables
 106  */
 107
 108 /* state tables */
 109 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[2]);
 110 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 111 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 112 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 113 VNET_DEFINE(struct pf_status,            pf_status);
 114
 115 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 116 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 117 VNET_DEFINE(int,                         altqs_inactive_open);
 118 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 119
 120 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 121 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 122 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 123 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 124 VNET_DEFINE(int,                         pf_tcp_secret_init);
 125 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 126 VNET_DEFINE(int,                         pf_tcp_iss_off);
 127 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 128
 129 /*
 130  * Queue for pf_intr() sends.
 131  */
 132 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 133 struct pf_send_entry {
 134         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 135         struct mbuf                     *pfse_m;
 136         enum {
 137                 PFSE_IP,
 138                 PFSE_IP6,
 139                 PFSE_ICMP,
 140                 PFSE_ICMP6,
 141         }                               pfse_type;
 142         union {
 143                 struct route            ro;
 144                 struct {
 145                         int             type;
 146                         int             code;
 147                         int             mtu;
 148                 } icmpopts;
 149         } u;
 150 #define pfse_ro         u.ro
 151 #define pfse_icmp_type  u.icmpopts.type
 152 #define pfse_icmp_code  u.icmpopts.code
 153 #define pfse_icmp_mtu   u.icmpopts.mtu
 154 };
 155
 156 STAILQ_HEAD(pf_send_head, pf_send_entry);
 157 static VNET_DEFINE(struct pf_send_head, pf_sendqueue);
 158 #define V_pf_sendqueue  VNET(pf_sendqueue)
 159
 160 static struct mtx pf_sendqueue_mtx;
 161 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 162 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 163
 164 /*
 165  * Queue for pf_overload_task() tasks.
 166  */
 167 struct pf_overload_entry {
 168         SLIST_ENTRY(pf_overload_entry)  next;
 169         struct pf_addr                  addr;
 170         sa_family_t                     af;
 171         uint8_t                         dir;
 172         struct pf_rule                  *rule;
 173 };
 174
 175 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 176 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue);
 177 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 178 static VNET_DEFINE(struct task, pf_overloadtask);
 179 #define V_pf_overloadtask       VNET(pf_overloadtask)
 180
 181 static struct mtx pf_overloadqueue_mtx;
 182 #define PF_OVERLOADQ_LOCK()     mtx_lock(&pf_overloadqueue_mtx)
 183 #define PF_OVERLOADQ_UNLOCK()   mtx_unlock(&pf_overloadqueue_mtx)
 184
 185 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules);
 186 struct mtx pf_unlnkdrules_mtx;
 187
 188 static VNET_DEFINE(uma_zone_t,  pf_sources_z);
 189 #define V_pf_sources_z  VNET(pf_sources_z)
 190 static VNET_DEFINE(uma_zone_t,  pf_mtag_z);
 191 #define V_pf_mtag_z     VNET(pf_mtag_z)
 192 VNET_DEFINE(uma_zone_t,  pf_state_z);
 193 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 194
 195 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 196 #define PFID_CPUBITS    8
 197 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 198 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 199 #define PFID_MAXID      (~PFID_CPUMASK)
 200 CTASSERT((1 << PFID_CPUBITS) > MAXCPU);
 201
 202 static void              pf_src_tree_remove_state(struct pf_state *);
 203 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 204                             u_int32_t);
 205 static void              pf_add_threshold(struct pf_threshold *);
 206 static int               pf_check_threshold(struct pf_threshold *);
 207
 208 static void              pf_change_ap(struct pf_addr *, u_int16_t *,
 209                             u_int16_t *, u_int16_t *, struct pf_addr *,
 210                             u_int16_t, u_int8_t, sa_family_t);
 211 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 212                             struct tcphdr *, struct pf_state_peer *);
 213 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 214                             struct pf_addr *, struct pf_addr *, u_int16_t,
 215                             u_int16_t *, u_int16_t *, u_int16_t *,
 216                             u_int16_t *, u_int8_t, sa_family_t);
 217 static void              pf_send_tcp(struct mbuf *,
 218                             const struct pf_rule *, sa_family_t,
 219                             const struct pf_addr *, const struct pf_addr *,
 220                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 221                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 222                             u_int16_t, struct ifnet *);
 223 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 224                             sa_family_t, struct pf_rule *);
 225 static void              pf_detach_state(struct pf_state *);
 226 static int               pf_state_key_attach(struct pf_state_key *,
 227                             struct pf_state_key *, struct pf_state *);
 228 static void              pf_state_key_detach(struct pf_state *, int);
 229 static int               pf_state_key_ctor(void *, int, void *, int);
 230 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 231 static int               pf_test_rule(struct pf_rule **, struct pf_state **,
 232                             int, struct pfi_kif *, struct mbuf *, int,
 233                             struct pf_pdesc *, struct pf_rule **,
 234                             struct pf_ruleset **, struct inpcb *);
 235 static int               pf_create_state(struct pf_rule *, struct pf_rule *,
 236                             struct pf_rule *, struct pf_pdesc *,
 237                             struct pf_src_node *, struct pf_state_key *,
 238                             struct pf_state_key *, struct mbuf *, int,
 239                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 240                             struct pf_state **, int, u_int16_t, u_int16_t,
 241                             int);
 242 static int               pf_test_fragment(struct pf_rule **, int,
 243                             struct pfi_kif *, struct mbuf *, void *,
 244                             struct pf_pdesc *, struct pf_rule **,
 245                             struct pf_ruleset **);
 246 static int               pf_tcp_track_full(struct pf_state_peer *,
 247                             struct pf_state_peer *, struct pf_state **,
 248                             struct pfi_kif *, struct mbuf *, int,
 249                             struct pf_pdesc *, u_short *, int *);
 250 static int               pf_tcp_track_sloppy(struct pf_state_peer *,
 251                             struct pf_state_peer *, struct pf_state **,
 252                             struct pf_pdesc *, u_short *);
 253 static int               pf_test_state_tcp(struct pf_state **, int,
 254                             struct pfi_kif *, struct mbuf *, int,
 255                             void *, struct pf_pdesc *, u_short *);
 256 static int               pf_test_state_udp(struct pf_state **, int,
 257                             struct pfi_kif *, struct mbuf *, int,
 258                             void *, struct pf_pdesc *);
 259 static int               pf_test_state_icmp(struct pf_state **, int,
 260                             struct pfi_kif *, struct mbuf *, int,
 261                             void *, struct pf_pdesc *, u_short *);
 262 static int               pf_test_state_other(struct pf_state **, int,
 263                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 264 static u_int8_t          pf_get_wscale(struct mbuf *, int, u_int16_t,
 265                             sa_family_t);
 266 static u_int16_t         pf_get_mss(struct mbuf *, int, u_int16_t,
 267                             sa_family_t);
 268 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 269                                 int, u_int16_t);
 270 static void              pf_set_rt_ifp(struct pf_state *,
 271                             struct pf_addr *);
 272 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 273                             u_int8_t, sa_family_t);
 274 static void              pf_print_state_parts(struct pf_state *,
 275                             struct pf_state_key *, struct pf_state_key *);
 276 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 277                             struct pf_addr_wrap *);
 278 static struct pf_state  *pf_find_state(struct pfi_kif *,
 279                             struct pf_state_key_cmp *, u_int);
 280 static int               pf_src_connlimit(struct pf_state **);
 281 static void              pf_overload_task(void *c, int pending);
 282 static int               pf_insert_src_node(struct pf_src_node **,
 283                             struct pf_rule *, struct pf_addr *, sa_family_t);
 284 static u_int             pf_purge_expired_states(u_int, int);
 285 static void              pf_purge_unlinked_rules(void);
 286 static int               pf_mtag_init(void *, int, int);
 287 static void              pf_mtag_free(struct m_tag *);
 288 #ifdef INET
 289 static void              pf_route(struct mbuf **, struct pf_rule *, int,
 290                             struct ifnet *, struct pf_state *,
 291                             struct pf_pdesc *);
 292 #endif /* INET */
 293 #ifdef INET6
 294 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 295                             struct pf_addr *, u_int8_t);
 296 static void              pf_route6(struct mbuf **, struct pf_rule *, int,
 297                             struct ifnet *, struct pf_state *,
 298                             struct pf_pdesc *);
 299 #endif /* INET6 */
 300
 301 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 302
 303 VNET_DECLARE(int, pf_end_threads);
 304
 305 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 306
 307 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 308                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 309
 310 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 311         do {                                                            \
 312                 (s) = pf_find_state((i), (k), (d));                     \
 313                 if ((s) == NULL || (s)->timeout == PFTM_PURGE)          \
 314                         return (PF_DROP);                               \
 315                 if (PACKET_LOOPED(pd))                                  \
 316                         return (PF_PASS);                               \
 317                 if ((d) == PF_OUT &&                                    \
 318                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 319                     (s)->rule.ptr->direction == PF_OUT) ||              \
 320                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 321                     (s)->rule.ptr->direction == PF_IN)) &&              \
 322                     (s)->rt_kif != NULL &&                              \
 323                     (s)->rt_kif != (i))                                 \
 324                         return (PF_PASS);                               \
 325         } while (0)
 326
 327 #define BOUND_IFACE(r, k) \
 328         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 329
 330 #define STATE_INC_COUNTERS(s)                           \
 331         do {                                            \
 332                 s->rule.ptr->states_cur++;              \
 333                 s->rule.ptr->states_tot++;              \
 334                 if (s->anchor.ptr != NULL) {            \
 335                         s->anchor.ptr->states_cur++;    \
 336                         s->anchor.ptr->states_tot++;    \
 337                 }                                       \
 338                 if (s->nat_rule.ptr != NULL) {          \
 339                         s->nat_rule.ptr->states_cur++;  \
 340                         s->nat_rule.ptr->states_tot++;  \
 341                 }                                       \
 342         } while (0)
 343
 344 #define STATE_DEC_COUNTERS(s)                           \
 345         do {                                            \
 346                 if (s->nat_rule.ptr != NULL)            \
 347                         s->nat_rule.ptr->states_cur--;  \
 348                 if (s->anchor.ptr != NULL)              \
 349                         s->anchor.ptr->states_cur--;    \
 350                 s->rule.ptr->states_cur--;              \
 351         } while (0)
 352
 353 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 354 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 355 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 356 VNET_DEFINE(u_long, pf_hashmask);
 357 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 358 VNET_DEFINE(u_long, pf_srchashmask);
 359
 360 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
 361
 362 VNET_DEFINE(u_long, pf_hashsize);
 363 #define V_pf_hashsize   VNET(pf_hashsize)
 364 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 365     &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable");
 366
 367 VNET_DEFINE(u_long, pf_srchashsize);
 368 #define V_pf_srchashsize        VNET(pf_srchashsize)
 369 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 370     &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable");
 371
 372 VNET_DEFINE(void *, pf_swi_cookie);
 373
 374 VNET_DEFINE(uint32_t, pf_hashseed);
 375 #define V_pf_hashseed   VNET(pf_hashseed)
 376
 377 static __inline uint32_t
 378 pf_hashkey(struct pf_state_key *sk)
 379 {
 380         uint32_t h;
 381
 382         h = jenkins_hash32((uint32_t *)sk,
 383             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 384             V_pf_hashseed);
 385
 386         return (h & V_pf_hashmask);
 387 }
 388
 389 static __inline uint32_t
 390 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 391 {
 392         uint32_t h;
 393
 394         switch (af) {
 395         case AF_INET:
 396                 h = jenkins_hash32((uint32_t *)&addr->v4,
 397                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 398                 break;
 399         case AF_INET6:
 400                 h = jenkins_hash32((uint32_t *)&addr->v6,
 401                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 402                 break;
 403         default:
 404                 panic("%s: unknown address family %u", __func__, af);
 405         }
 406
 407         return (h & V_pf_srchashmask);
 408 }
 409
 410 #ifdef INET6
 411 void
 412 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 413 {
 414         switch (af) {
 415 #ifdef INET
 416         case AF_INET:
 417                 dst->addr32[0] = src->addr32[0];
 418                 break;
 419 #endif /* INET */
 420         case AF_INET6:
 421                 dst->addr32[0] = src->addr32[0];
 422                 dst->addr32[1] = src->addr32[1];
 423                 dst->addr32[2] = src->addr32[2];
 424                 dst->addr32[3] = src->addr32[3];
 425                 break;
 426         }
 427 }
 428 #endif /* INET6 */
 429
 430 static void
 431 pf_init_threshold(struct pf_threshold *threshold,
 432     u_int32_t limit, u_int32_t seconds)
 433 {
 434         threshold->limit = limit * PF_THRESHOLD_MULT;
 435         threshold->seconds = seconds;
 436         threshold->count = 0;
 437         threshold->last = time_uptime;
 438 }
 439
 440 static void
 441 pf_add_threshold(struct pf_threshold *threshold)
 442 {
 443         u_int32_t t = time_uptime, diff = t - threshold->last;
 444
 445         if (diff >= threshold->seconds)
 446                 threshold->count = 0;
 447         else
 448                 threshold->count -= threshold->count * diff /
 449                     threshold->seconds;
 450         threshold->count += PF_THRESHOLD_MULT;
 451         threshold->last = t;
 452 }
 453
 454 static int
 455 pf_check_threshold(struct pf_threshold *threshold)
 456 {
 457         return (threshold->count > threshold->limit);
 458 }
 459
 460 static int
 461 pf_src_connlimit(struct pf_state **state)
 462 {
 463         struct pf_overload_entry *pfoe;
 464         int bad = 0;
 465
 466         PF_STATE_LOCK_ASSERT(*state);
 467
 468         (*state)->src_node->conn++;
 469         (*state)->src.tcp_est = 1;
 470         pf_add_threshold(&(*state)->src_node->conn_rate);
 471
 472         if ((*state)->rule.ptr->max_src_conn &&
 473             (*state)->rule.ptr->max_src_conn <
 474             (*state)->src_node->conn) {
 475                 V_pf_status.lcounters[LCNT_SRCCONN]++;
 476                 bad++;
 477         }
 478
 479         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 480             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 481                 V_pf_status.lcounters[LCNT_SRCCONNRATE]++;
 482                 bad++;
 483         }
 484
 485         if (!bad)
 486                 return (0);
 487
 488         /* Kill this state. */
 489         (*state)->timeout = PFTM_PURGE;
 490         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 491
 492         if ((*state)->rule.ptr->overload_tbl == NULL)
 493                 return (1);
 494
 495         /* Schedule overloading and flushing task. */
 496         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 497         if (pfoe == NULL)
 498                 return (1);     /* too bad :( */
 499
 500         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 501         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 502         pfoe->rule = (*state)->rule.ptr;
 503         pfoe->dir = (*state)->direction;
 504         PF_OVERLOADQ_LOCK();
 505         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 506         PF_OVERLOADQ_UNLOCK();
 507         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 508
 509         return (1);
 510 }
 511
 512 static void
 513 pf_overload_task(void *c, int pending)
 514 {
 515         struct pf_overload_head queue;
 516         struct pfr_addr p;
 517         struct pf_overload_entry *pfoe, *pfoe1;
 518         uint32_t killed = 0;
 519
 520         PF_OVERLOADQ_LOCK();
 521         queue = *(struct pf_overload_head *)c;
 522         SLIST_INIT((struct pf_overload_head *)c);
 523         PF_OVERLOADQ_UNLOCK();
 524
 525         bzero(&p, sizeof(p));
 526         SLIST_FOREACH(pfoe, &queue, next) {
 527                 V_pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
 528                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 529                         printf("%s: blocking address ", __func__);
 530                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 531                         printf("\n");
 532                 }
 533
 534                 p.pfra_af = pfoe->af;
 535                 switch (pfoe->af) {
 536 #ifdef INET
 537                 case AF_INET:
 538                         p.pfra_net = 32;
 539                         p.pfra_ip4addr = pfoe->addr.v4;
 540                         break;
 541 #endif
 542 #ifdef INET6
 543                 case AF_INET6:
 544                         p.pfra_net = 128;
 545                         p.pfra_ip6addr = pfoe->addr.v6;
 546                         break;
 547 #endif
 548                 }
 549
 550                 PF_RULES_WLOCK();
 551                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 552                 PF_RULES_WUNLOCK();
 553         }
 554
 555         /*
 556          * Remove those entries, that don't need flushing.
 557          */
 558         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 559                 if (pfoe->rule->flush == 0) {
 560                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 561                         free(pfoe, M_PFTEMP);
 562                 } else
 563                         V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
 564
 565         /* If nothing to flush, return. */
 566         if (SLIST_EMPTY(&queue))
 567                 return;
 568
 569         for (int i = 0; i <= V_pf_hashmask; i++) {
 570                 struct pf_idhash *ih = &V_pf_idhash[i];
 571                 struct pf_state_key *sk;
 572                 struct pf_state *s;
 573
 574                 PF_HASHROW_LOCK(ih);
 575                 LIST_FOREACH(s, &ih->states, entry) {
 576                     sk = s->key[PF_SK_WIRE];
 577                     SLIST_FOREACH(pfoe, &queue, next)
 578                         if (sk->af == pfoe->af &&
 579                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 580                             pfoe->rule == s->rule.ptr) &&
 581                             ((pfoe->dir == PF_OUT &&
 582                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 583                             (pfoe->dir == PF_IN &&
 584                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 585                                 s->timeout = PFTM_PURGE;
 586                                 s->src.state = s->dst.state = TCPS_CLOSED;
 587                                 killed++;
 588                         }
 589                 }
 590                 PF_HASHROW_UNLOCK(ih);
 591         }
 592         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 593                 free(pfoe, M_PFTEMP);
 594         if (V_pf_status.debug >= PF_DEBUG_MISC)
 595                 printf("%s: %u states killed", __func__, killed);
 596 }
 597
 598 /*
 599  * Can return locked on failure, so that we can consistently
 600  * allocate and insert a new one.
 601  */
 602 struct pf_src_node *
 603 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
 604         int returnlocked)
 605 {
 606         struct pf_srchash *sh;
 607         struct pf_src_node *n;
 608
 609         V_pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 610
 611         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 612         PF_HASHROW_LOCK(sh);
 613         LIST_FOREACH(n, &sh->nodes, entry)
 614                 if (n->rule.ptr == rule && n->af == af &&
 615                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 616                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 617                         break;
 618         if (n != NULL || returnlocked == 0)
 619                 PF_HASHROW_UNLOCK(sh);
 620
 621         return (n);
 622 }
 623
 624 static int
 625 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 626     struct pf_addr *src, sa_family_t af)
 627 {
 628
 629         KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
 630             rule->rpool.opts & PF_POOL_STICKYADDR),
 631             ("%s for non-tracking rule %p", __func__, rule));
 632
 633         if (*sn == NULL)
 634                 *sn = pf_find_src_node(src, rule, af, 1);
 635
 636         if (*sn == NULL) {
 637                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 638
 639                 PF_HASHROW_ASSERT(sh);
 640
 641                 if (!rule->max_src_nodes ||
 642                     rule->src_nodes < rule->max_src_nodes)
 643                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 644                 else
 645                         V_pf_status.lcounters[LCNT_SRCNODES]++;
 646                 if ((*sn) == NULL) {
 647                         PF_HASHROW_UNLOCK(sh);
 648                         return (-1);
 649                 }
 650
 651                 pf_init_threshold(&(*sn)->conn_rate,
 652                     rule->max_src_conn_rate.limit,
 653                     rule->max_src_conn_rate.seconds);
 654
 655                 (*sn)->af = af;
 656                 (*sn)->rule.ptr = rule;
 657                 PF_ACPY(&(*sn)->addr, src, af);
 658                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 659                 (*sn)->creation = time_uptime;
 660                 (*sn)->ruletype = rule->action;
 661                 if ((*sn)->rule.ptr != NULL)
 662                         (*sn)->rule.ptr->src_nodes++;
 663                 PF_HASHROW_UNLOCK(sh);
 664                 V_pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
 665                 V_pf_status.src_nodes++;
 666         } else {
 667                 if (rule->max_src_states &&
 668                     (*sn)->states >= rule->max_src_states) {
 669                         V_pf_status.lcounters[LCNT_SRCSTATES]++;
 670                         return (-1);
 671                 }
 672         }
 673         return (0);
 674 }
 675
 676 static void
 677 pf_remove_src_node(struct pf_src_node *src)
 678 {
 679         struct pf_srchash *sh;
 680
 681         sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)];
 682         PF_HASHROW_LOCK(sh);
 683         LIST_REMOVE(src, entry);
 684         PF_HASHROW_UNLOCK(sh);
 685
 686         V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 687         V_pf_status.src_nodes--;
 688
 689         uma_zfree(V_pf_sources_z, src);
 690 }
 691
 692 /* Data storage structures initialization. */
 693 void
 694 pf_initialize()
 695 {
 696         struct pf_keyhash       *kh;
 697         struct pf_idhash        *ih;
 698         struct pf_srchash       *sh;
 699         u_int i;
 700
 701         TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize);
 702         if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize))
 703                 V_pf_hashsize = PF_HASHSIZ;
 704         TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize);
 705         if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize))
 706                 V_pf_srchashsize = PF_HASHSIZ / 4;
 707
 708         V_pf_hashseed = arc4random();
 709
 710         /* States and state keys storage. */
 711         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
 712             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 713         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
 714         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
 715         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
 716
 717         V_pf_state_key_z = uma_zcreate("pf state keys",
 718             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
 719             UMA_ALIGN_PTR, 0);
 720         V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash),
 721             M_PFHASH, M_WAITOK | M_ZERO);
 722         V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash),
 723             M_PFHASH, M_WAITOK | M_ZERO);
 724         V_pf_hashmask = V_pf_hashsize - 1;
 725         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask;
 726             i++, kh++, ih++) {
 727                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
 728                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
 729         }
 730
 731         /* Source nodes. */
 732         V_pf_sources_z = uma_zcreate("pf source nodes",
 733             sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
 734             0);
 735         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
 736         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
 737         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
 738         V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash),
 739           M_PFHASH, M_WAITOK|M_ZERO);
 740         V_pf_srchashmask = V_pf_srchashsize - 1;
 741         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++)
 742                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
 743
 744         /* ALTQ */
 745         TAILQ_INIT(&V_pf_altqs[0]);
 746         TAILQ_INIT(&V_pf_altqs[1]);
 747         TAILQ_INIT(&V_pf_pabuf);
 748         V_pf_altqs_active = &V_pf_altqs[0];
 749         V_pf_altqs_inactive = &V_pf_altqs[1];
 750
 751         /* Mbuf tags */
 752         V_pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 753             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_init, NULL,
 754             UMA_ALIGN_PTR, 0);
 755
 756         /* Send & overload+flush queues. */
 757         STAILQ_INIT(&V_pf_sendqueue);
 758         SLIST_INIT(&V_pf_overloadqueue);
 759         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, &V_pf_overloadqueue);
 760         mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF);
 761         mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL,
 762             MTX_DEF);
 763
 764         /* Unlinked, but may be referenced rules. */
 765         TAILQ_INIT(&V_pf_unlinked_rules);
 766         mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF);
 767 }
 768
 769 void
 770 pf_cleanup()
 771 {
 772         struct pf_keyhash       *kh;
 773         struct pf_idhash        *ih;
 774         struct pf_srchash       *sh;
 775         struct pf_send_entry    *pfse, *next;
 776         u_int i;
 777
 778         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask;
 779             i++, kh++, ih++) {
 780                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
 781                     __func__));
 782                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
 783                     __func__));
 784                 mtx_destroy(&kh->lock);
 785                 mtx_destroy(&ih->lock);
 786         }
 787         free(V_pf_keyhash, M_PFHASH);
 788         free(V_pf_idhash, M_PFHASH);
 789
 790         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) {
 791                 KASSERT(LIST_EMPTY(&sh->nodes),
 792                     ("%s: source node hash not empty", __func__));
 793                 mtx_destroy(&sh->lock);
 794         }
 795         free(V_pf_srchash, M_PFHASH);
 796
 797         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
 798                 m_freem(pfse->pfse_m);
 799                 free(pfse, M_PFTEMP);
 800         }
 801
 802         mtx_destroy(&pf_sendqueue_mtx);
 803         mtx_destroy(&pf_overloadqueue_mtx);
 804         mtx_destroy(&pf_unlnkdrules_mtx);
 805
 806         uma_zdestroy(V_pf_mtag_z);
 807         uma_zdestroy(V_pf_sources_z);
 808         uma_zdestroy(V_pf_state_z);
 809         uma_zdestroy(V_pf_state_key_z);
 810 }
 811
 812 static int
 813 pf_mtag_init(void *mem, int size, int how)
 814 {
 815         struct m_tag *t;
 816
 817         t = (struct m_tag *)mem;
 818         t->m_tag_cookie = MTAG_ABI_COMPAT;
 819         t->m_tag_id = PACKET_TAG_PF;
 820         t->m_tag_len = sizeof(struct pf_mtag);
 821         t->m_tag_free = pf_mtag_free;
 822
 823         return (0);
 824 }
 825
 826 static void
 827 pf_mtag_free(struct m_tag *t)
 828 {
 829
 830         uma_zfree(V_pf_mtag_z, t);
 831 }
 832
 833 struct pf_mtag *
 834 pf_get_mtag(struct mbuf *m)
 835 {
 836         struct m_tag *mtag;
 837
 838         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 839                 return ((struct pf_mtag *)(mtag + 1));
 840
 841         mtag = uma_zalloc(V_pf_mtag_z, M_NOWAIT);
 842         if (mtag == NULL)
 843                 return (NULL);
 844         bzero(mtag + 1, sizeof(struct pf_mtag));
 845         m_tag_prepend(m, mtag);
 846
 847         return ((struct pf_mtag *)(mtag + 1));
 848 }
 849
 850 static int
 851 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
 852     struct pf_state *s)
 853 {
 854         struct pf_keyhash       *khs, *khw, *kh;
 855         struct pf_state_key     *sk, *cur;
 856         struct pf_state         *si, *olds = NULL;
 857         int idx;
 858
 859         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
 860         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
 861         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
 862
 863         /*
 864          * We need to lock hash slots of both keys. To avoid deadlock
 865          * we always lock the slot with lower address first. Unlock order
 866          * isn't important.
 867          *
 868          * We also need to lock ID hash slot before dropping key
 869          * locks. On success we return with ID hash slot locked.
 870          */
 871
 872         if (skw == sks) {
 873                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
 874                 PF_HASHROW_LOCK(khs);
 875         } else {
 876                 khs = &V_pf_keyhash[pf_hashkey(sks)];
 877                 khw = &V_pf_keyhash[pf_hashkey(skw)];
 878                 if (khs == khw) {
 879                         PF_HASHROW_LOCK(khs);
 880                 } else if (khs < khw) {
 881                         PF_HASHROW_LOCK(khs);
 882                         PF_HASHROW_LOCK(khw);
 883                 } else {
 884                         PF_HASHROW_LOCK(khw);
 885                         PF_HASHROW_LOCK(khs);
 886                 }
 887         }
 888
 889 #define KEYS_UNLOCK()   do {                    \
 890         if (khs != khw) {                       \
 891                 PF_HASHROW_UNLOCK(khs);         \
 892                 PF_HASHROW_UNLOCK(khw);         \
 893         } else                                  \
 894                 PF_HASHROW_UNLOCK(khs);         \
 895 } while (0)
 896
 897         /*
 898          * First run: start with wire key.
 899          */
 900         sk = skw;
 901         kh = khw;
 902         idx = PF_SK_WIRE;
 903
 904 keyattach:
 905         LIST_FOREACH(cur, &kh->keys, entry)
 906                 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
 907                         break;
 908
 909         if (cur != NULL) {
 910                 /* Key exists. Check for same kif, if none, add to key. */
 911                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
 912                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
 913
 914                         PF_HASHROW_LOCK(ih);
 915                         if (si->kif == s->kif &&
 916                             si->direction == s->direction) {
 917                                 if (sk->proto == IPPROTO_TCP &&
 918                                     si->src.state >= TCPS_FIN_WAIT_2 &&
 919                                     si->dst.state >= TCPS_FIN_WAIT_2) {
 920                                         /*
 921                                          * New state matches an old >FIN_WAIT_2
 922                                          * state. We can't drop key hash locks,
 923                                          * thus we can't unlink it properly.
 924                                          *
 925                                          * As a workaround we drop it into
 926                                          * TCPS_CLOSED state, schedule purge
 927                                          * ASAP and push it into the very end
 928                                          * of the slot TAILQ, so that it won't
 929                                          * conflict with our new state.
 930                                          */
 931                                         si->src.state = si->dst.state =
 932                                             TCPS_CLOSED;
 933                                         si->timeout = PFTM_PURGE;
 934                                         olds = si;
 935                                 } else {
 936                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
 937                                                 printf("pf: %s key attach "
 938                                                     "failed on %s: ",
 939                                                     (idx == PF_SK_WIRE) ?
 940                                                     "wire" : "stack",
 941                                                     s->kif->pfik_name);
 942                                                 pf_print_state_parts(s,
 943                                                     (idx == PF_SK_WIRE) ?
 944                                                     sk : NULL,
 945                                                     (idx == PF_SK_STACK) ?
 946                                                     sk : NULL);
 947                                                 printf(", existing: ");
 948                                                 pf_print_state_parts(si,
 949                                                     (idx == PF_SK_WIRE) ?
 950                                                     sk : NULL,
 951                                                     (idx == PF_SK_STACK) ?
 952                                                     sk : NULL);
 953                                                 printf("\n");
 954                                         }
 955                                         PF_HASHROW_UNLOCK(ih);
 956                                         KEYS_UNLOCK();
 957                                         uma_zfree(V_pf_state_key_z, sk);
 958                                         if (idx == PF_SK_STACK)
 959                                                 pf_detach_state(s);
 960                                         return (EEXIST); /* collision! */
 961                                 }
 962                         }
 963                         PF_HASHROW_UNLOCK(ih);
 964                 }
 965                 uma_zfree(V_pf_state_key_z, sk);
 966                 s->key[idx] = cur;
 967         } else {
 968                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
 969                 s->key[idx] = sk;
 970         }
 971
 972 stateattach:
 973         /* List is sorted, if-bound states before floating. */
 974         if (s->kif == V_pfi_all)
 975                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
 976         else
 977                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
 978
 979         if (olds) {
 980                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
 981                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
 982                     key_list[idx]);
 983                 olds = NULL;
 984         }
 985
 986         /*
 987          * Attach done. See how should we (or should not?)
 988          * attach a second key.
 989          */
 990         if (sks == skw) {
 991                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
 992                 idx = PF_SK_STACK;
 993                 sks = NULL;
 994                 goto stateattach;
 995         } else if (sks != NULL) {
 996                 /*
 997                  * Continue attaching with stack key.
 998                  */
 999                 sk = sks;
1000                 kh = khs;
1001                 idx = PF_SK_STACK;
1002                 sks = NULL;
1003                 goto keyattach;
1004         }
1005
1006         PF_STATE_LOCK(s);
1007         KEYS_UNLOCK();
1008
1009         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1010             ("%s failure", __func__));
1011
1012         return (0);
1013 #undef  KEYS_UNLOCK
1014 }
1015
1016 static void
1017 pf_detach_state(struct pf_state *s)
1018 {
1019         struct pf_state_key *sks = s->key[PF_SK_STACK];
1020         struct pf_keyhash *kh;
1021
1022         if (sks != NULL) {
1023                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1024                 PF_HASHROW_LOCK(kh);
1025                 if (s->key[PF_SK_STACK] != NULL)
1026                         pf_state_key_detach(s, PF_SK_STACK);
1027                 /*
1028                  * If both point to same key, then we are done.
1029                  */
1030                 if (sks == s->key[PF_SK_WIRE]) {
1031                         pf_state_key_detach(s, PF_SK_WIRE);
1032                         PF_HASHROW_UNLOCK(kh);
1033                         return;
1034                 }
1035                 PF_HASHROW_UNLOCK(kh);
1036         }
1037
1038         if (s->key[PF_SK_WIRE] != NULL) {
1039                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1040                 PF_HASHROW_LOCK(kh);
1041                 if (s->key[PF_SK_WIRE] != NULL)
1042                         pf_state_key_detach(s, PF_SK_WIRE);
1043                 PF_HASHROW_UNLOCK(kh);
1044         }
1045 }
1046
1047 static void
1048 pf_state_key_detach(struct pf_state *s, int idx)
1049 {
1050         struct pf_state_key *sk = s->key[idx];
1051 #ifdef INVARIANTS
1052         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1053
1054         PF_HASHROW_ASSERT(kh);
1055 #endif
1056         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1057         s->key[idx] = NULL;
1058
1059         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1060                 LIST_REMOVE(sk, entry);
1061                 uma_zfree(V_pf_state_key_z, sk);
1062         }
1063 }
1064
1065 static int
1066 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1067 {
1068         struct pf_state_key *sk = mem;
1069
1070         bzero(sk, sizeof(struct pf_state_key_cmp));
1071         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1072         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1073
1074         return (0);
1075 }
1076
1077 struct pf_state_key *
1078 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1079         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1080 {
1081         struct pf_state_key *sk;
1082
1083         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1084         if (sk == NULL)
1085                 return (NULL);
1086
1087         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1088         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1089         sk->port[pd->sidx] = sport;
1090         sk->port[pd->didx] = dport;
1091         sk->proto = pd->proto;
1092         sk->af = pd->af;
1093
1094         return (sk);
1095 }
1096
1097 struct pf_state_key *
1098 pf_state_key_clone(struct pf_state_key *orig)
1099 {
1100         struct pf_state_key *sk;
1101
1102         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1103         if (sk == NULL)
1104                 return (NULL);
1105
1106         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1107
1108         return (sk);
1109 }
1110
1111 int
1112 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1113     struct pf_state_key *sks, struct pf_state *s)
1114 {
1115         struct pf_idhash *ih;
1116         struct pf_state *cur;
1117         int error;
1118
1119         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1120             ("%s: sks not pristine", __func__));
1121         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1122             ("%s: skw not pristine", __func__));
1123         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1124
1125         s->kif = kif;
1126
1127         if (s->id == 0 && s->creatorid == 0) {
1128                 /* XXX: should be atomic, but probability of collision low */
1129                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1130                         V_pf_stateid[curcpu] = 1;
1131                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1132                 s->id = htobe64(s->id);
1133                 s->creatorid = V_pf_status.hostid;
1134         }
1135
1136         /* Returns with ID locked on success. */
1137         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1138                 return (error);
1139
1140         ih = &V_pf_idhash[PF_IDHASH(s)];
1141         PF_HASHROW_ASSERT(ih);
1142         LIST_FOREACH(cur, &ih->states, entry)
1143                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1144                         break;
1145
1146         if (cur != NULL) {
1147                 PF_HASHROW_UNLOCK(ih);
1148                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1149                         printf("pf: state ID collision: "
1150                             "id: %016llx creatorid: %08x\n",
1151                             (unsigned long long)be64toh(s->id),
1152                             ntohl(s->creatorid));
1153                 }
1154                 pf_detach_state(s);
1155                 return (EEXIST);
1156         }
1157         LIST_INSERT_HEAD(&ih->states, s, entry);
1158         /* One for keys, one for ID hash. */
1159         refcount_init(&s->refs, 2);
1160
1161         V_pf_status.fcounters[FCNT_STATE_INSERT]++;
1162         if (pfsync_insert_state_ptr != NULL)
1163                 pfsync_insert_state_ptr(s);
1164
1165         /* Returns locked. */
1166         return (0);
1167 }
1168
1169 /*
1170  * Find state by ID: returns with locked row on success.
1171  */
1172 struct pf_state *
1173 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1174 {
1175         struct pf_idhash *ih;
1176         struct pf_state *s;
1177
1178         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1179
1180         ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))];
1181
1182         PF_HASHROW_LOCK(ih);
1183         LIST_FOREACH(s, &ih->states, entry)
1184                 if (s->id == id && s->creatorid == creatorid)
1185                         break;
1186
1187         if (s == NULL)
1188                 PF_HASHROW_UNLOCK(ih);
1189
1190         return (s);
1191 }
1192
1193 /*
1194  * Find state by key.
1195  * Returns with ID hash slot locked on success.
1196  */
1197 static struct pf_state *
1198 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1199 {
1200         struct pf_keyhash       *kh;
1201         struct pf_state_key     *sk;
1202         struct pf_state         *s;
1203         int idx;
1204
1205         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1206
1207         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1208
1209         PF_HASHROW_LOCK(kh);
1210         LIST_FOREACH(sk, &kh->keys, entry)
1211                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1212                         break;
1213         if (sk == NULL) {
1214                 PF_HASHROW_UNLOCK(kh);
1215                 return (NULL);
1216         }
1217
1218         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1219
1220         /* List is sorted, if-bound states before floating ones. */
1221         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1222                 if (s->kif == V_pfi_all || s->kif == kif) {
1223                         PF_STATE_LOCK(s);
1224                         PF_HASHROW_UNLOCK(kh);
1225                         if (s->timeout == PFTM_UNLINKED) {
1226                                 /*
1227                                  * State is being processed
1228                                  * by pf_unlink_state() in
1229                                  * an other thread.
1230                                  */
1231                                 PF_STATE_UNLOCK(s);
1232                                 return (NULL);
1233                         }
1234                         return (s);
1235                 }
1236         PF_HASHROW_UNLOCK(kh);
1237
1238         return (NULL);
1239 }
1240
1241 struct pf_state *
1242 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1243 {
1244         struct pf_keyhash       *kh;
1245         struct pf_state_key     *sk;
1246         struct pf_state         *s, *ret = NULL;
1247         int                      idx, inout = 0;
1248
1249         V_pf_status.fcounters[FCNT_STATE_SEARCH]++;
1250
1251         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1252
1253         PF_HASHROW_LOCK(kh);
1254         LIST_FOREACH(sk, &kh->keys, entry)
1255                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1256                         break;
1257         if (sk == NULL) {
1258                 PF_HASHROW_UNLOCK(kh);
1259                 return (NULL);
1260         }
1261         switch (dir) {
1262         case PF_IN:
1263                 idx = PF_SK_WIRE;
1264                 break;
1265         case PF_OUT:
1266                 idx = PF_SK_STACK;
1267                 break;
1268         case PF_INOUT:
1269                 idx = PF_SK_WIRE;
1270                 inout = 1;
1271                 break;
1272         default:
1273                 panic("%s: dir %u", __func__, dir);
1274         }
1275 second_run:
1276         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1277                 if (more == NULL) {
1278                         PF_HASHROW_UNLOCK(kh);
1279                         return (s);
1280                 }
1281
1282                 if (ret)
1283                         (*more)++;
1284                 else
1285                         ret = s;
1286         }
1287         if (inout == 1) {
1288                 inout = 0;
1289                 idx = PF_SK_STACK;
1290                 goto second_run;
1291         }
1292         PF_HASHROW_UNLOCK(kh);
1293
1294         return (ret);
1295 }
1296
1297 /* END state table stuff */
1298
1299 static void
1300 pf_send(struct pf_send_entry *pfse)
1301 {
1302
1303         PF_SENDQ_LOCK();
1304         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1305         PF_SENDQ_UNLOCK();
1306         swi_sched(V_pf_swi_cookie, 0);
1307 }
1308
1309 void
1310 pf_intr(void *v)
1311 {
1312         struct pf_send_head queue;
1313         struct pf_send_entry *pfse, *next;
1314
1315         CURVNET_SET((struct vnet *)v);
1316
1317         PF_SENDQ_LOCK();
1318         queue = V_pf_sendqueue;
1319         STAILQ_INIT(&V_pf_sendqueue);
1320         PF_SENDQ_UNLOCK();
1321
1322         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1323                 switch (pfse->pfse_type) {
1324 #ifdef INET
1325                 case PFSE_IP:
1326                         ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1327                         break;
1328                 case PFSE_ICMP:
1329                         icmp_error(pfse->pfse_m, pfse->pfse_icmp_type,
1330                             pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu);
1331                         break;
1332 #endif /* INET */
1333 #ifdef INET6
1334                 case PFSE_IP6:
1335                         ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1336                             NULL);
1337                         break;
1338                 case PFSE_ICMP6:
1339                         icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type,
1340                             pfse->pfse_icmp_code, pfse->pfse_icmp_mtu);
1341                         break;
1342 #endif /* INET6 */
1343                 default:
1344                         panic("%s: unknown type", __func__);
1345                 }
1346                 free(pfse, M_PFTEMP);
1347         }
1348         CURVNET_RESTORE();
1349 }
1350
1351 void
1352 pf_purge_thread(void *v)
1353 {
1354         u_int idx = 0;
1355
1356         CURVNET_SET((struct vnet *)v);
1357
1358         for (;;) {
1359                 PF_RULES_RLOCK();
1360                 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10);
1361
1362                 if (V_pf_end_threads) {
1363                         /*
1364                          * To cleanse up all kifs and rules we need
1365                          * two runs: first one clears reference flags,
1366                          * then pf_purge_expired_states() doesn't
1367                          * raise them, and then second run frees.
1368                          */
1369                         PF_RULES_RUNLOCK();
1370                         pf_purge_unlinked_rules();
1371                         pfi_kif_purge();
1372
1373                         /*
1374                          * Now purge everything.
1375                          */
1376                         pf_purge_expired_states(0, V_pf_hashmask);
1377                         pf_purge_expired_fragments();
1378                         pf_purge_expired_src_nodes();
1379
1380                         /*
1381                          * Now all kifs & rules should be unreferenced,
1382                          * thus should be successfully freed.
1383                          */
1384                         pf_purge_unlinked_rules();
1385                         pfi_kif_purge();
1386
1387                         /*
1388                          * Announce success and exit.
1389                          */
1390                         PF_RULES_RLOCK();
1391                         V_pf_end_threads++;
1392                         PF_RULES_RUNLOCK();
1393                         wakeup(pf_purge_thread);
1394                         kproc_exit(0);
1395                 }
1396                 PF_RULES_RUNLOCK();
1397
1398                 /* Process 1/interval fraction of the state table every run. */
1399                 idx = pf_purge_expired_states(idx, V_pf_hashmask /
1400                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1401
1402                 /* Purge other expired types every PFTM_INTERVAL seconds. */
1403                 if (idx == 0) {
1404                         /*
1405                          * Order is important:
1406                          * - states and src nodes reference rules
1407                          * - states and rules reference kifs
1408                          */
1409                         pf_purge_expired_fragments();
1410                         pf_purge_expired_src_nodes();
1411                         pf_purge_unlinked_rules();
1412                         pfi_kif_purge();
1413                 }
1414         }
1415         /* not reached */
1416         CURVNET_RESTORE();
1417 }
1418
1419 u_int32_t
1420 pf_state_expires(const struct pf_state *state)
1421 {
1422         u_int32_t       timeout;
1423         u_int32_t       start;
1424         u_int32_t       end;
1425         u_int32_t       states;
1426
1427         /* handle all PFTM_* > PFTM_MAX here */
1428         if (state->timeout == PFTM_PURGE)
1429                 return (time_uptime);
1430         if (state->timeout == PFTM_UNTIL_PACKET)
1431                 return (0);
1432         KASSERT(state->timeout != PFTM_UNLINKED,
1433             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1434         KASSERT((state->timeout < PFTM_MAX),
1435             ("pf_state_expires: timeout > PFTM_MAX"));
1436         timeout = state->rule.ptr->timeout[state->timeout];
1437         if (!timeout)
1438                 timeout = V_pf_default_rule.timeout[state->timeout];
1439         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1440         if (start) {
1441                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1442                 states = state->rule.ptr->states_cur;   /* XXXGL */
1443         } else {
1444                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1445                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1446                 states = V_pf_status.states;
1447         }
1448         if (end && states > start && start < end) {
1449                 if (states < end)
1450                         return (state->expire + timeout * (end - states) /
1451                             (end - start));
1452                 else
1453                         return (time_uptime);
1454         }
1455         return (state->expire + timeout);
1456 }
1457
1458 void
1459 pf_purge_expired_src_nodes()
1460 {
1461         struct pf_srchash       *sh;
1462         struct pf_src_node      *cur, *next;
1463         int i;
1464
1465         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) {
1466             PF_HASHROW_LOCK(sh);
1467             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1468                 if (cur->states <= 0 && cur->expire <= time_uptime) {
1469                         if (cur->rule.ptr != NULL)
1470                                 cur->rule.ptr->src_nodes--;
1471                         LIST_REMOVE(cur, entry);
1472                         V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
1473                         V_pf_status.src_nodes--;
1474                         uma_zfree(V_pf_sources_z, cur);
1475                 } else if (cur->rule.ptr != NULL)
1476                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1477             PF_HASHROW_UNLOCK(sh);
1478         }
1479 }
1480
1481 static void
1482 pf_src_tree_remove_state(struct pf_state *s)
1483 {
1484         u_int32_t timeout;
1485
1486         if (s->src_node != NULL) {
1487                 if (s->src.tcp_est)
1488                         --s->src_node->conn;
1489                 if (--s->src_node->states <= 0) {
1490                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1491                         if (!timeout)
1492                                 timeout =
1493                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1494                         s->src_node->expire = time_uptime + timeout;
1495                 }
1496         }
1497         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1498                 if (--s->nat_src_node->states <= 0) {
1499                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1500                         if (!timeout)
1501                                 timeout =
1502                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1503                         s->nat_src_node->expire = time_uptime + timeout;
1504                 }
1505         }
1506         s->src_node = s->nat_src_node = NULL;
1507 }
1508
1509 /*
1510  * Unlink and potentilly free a state. Function may be
1511  * called with ID hash row locked, but always returns
1512  * unlocked, since it needs to go through key hash locking.
1513  */
1514 int
1515 pf_unlink_state(struct pf_state *s, u_int flags)
1516 {
1517         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1518
1519         if ((flags & PF_ENTER_LOCKED) == 0)
1520                 PF_HASHROW_LOCK(ih);
1521         else
1522                 PF_HASHROW_ASSERT(ih);
1523
1524         if (s->timeout == PFTM_UNLINKED) {
1525                 /*
1526                  * State is being processed
1527                  * by pf_unlink_state() in
1528                  * an other thread.
1529                  */
1530                 PF_HASHROW_UNLOCK(ih);
1531                 return (0);     /* XXXGL: undefined actually */
1532         }
1533
1534         if (s->src.state == PF_TCPS_PROXY_DST) {
1535                 /* XXX wire key the right one? */
1536                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1537                     &s->key[PF_SK_WIRE]->addr[1],
1538                     &s->key[PF_SK_WIRE]->addr[0],
1539                     s->key[PF_SK_WIRE]->port[1],
1540                     s->key[PF_SK_WIRE]->port[0],
1541                     s->src.seqhi, s->src.seqlo + 1,
1542                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1543         }
1544
1545         LIST_REMOVE(s, entry);
1546         pf_src_tree_remove_state(s);
1547
1548         if (pfsync_delete_state_ptr != NULL)
1549                 pfsync_delete_state_ptr(s);
1550
1551         --s->rule.ptr->states_cur;
1552         if (s->nat_rule.ptr != NULL)
1553                 --s->nat_rule.ptr->states_cur;
1554         if (s->anchor.ptr != NULL)
1555                 --s->anchor.ptr->states_cur;
1556
1557         s->timeout = PFTM_UNLINKED;
1558
1559         PF_HASHROW_UNLOCK(ih);
1560
1561         pf_detach_state(s);
1562         refcount_release(&s->refs);
1563
1564         return (pf_release_state(s));
1565 }
1566
1567 void
1568 pf_free_state(struct pf_state *cur)
1569 {
1570
1571         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1572         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1573             cur->timeout));
1574
1575         pf_normalize_tcp_cleanup(cur);
1576         uma_zfree(V_pf_state_z, cur);
1577         V_pf_status.fcounters[FCNT_STATE_REMOVALS]++;
1578 }
1579
1580 /*
1581  * Called only from pf_purge_thread(), thus serialized.
1582  */
1583 static u_int
1584 pf_purge_expired_states(u_int i, int maxcheck)
1585 {
1586         struct pf_idhash *ih;
1587         struct pf_state *s;
1588
1589         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1590
1591         /*
1592          * Go through hash and unlink states that expire now.
1593          */
1594         while (maxcheck > 0) {
1595
1596                 ih = &V_pf_idhash[i];
1597 relock:
1598                 PF_HASHROW_LOCK(ih);
1599                 LIST_FOREACH(s, &ih->states, entry) {
1600                         if (pf_state_expires(s) <= time_uptime) {
1601                                 V_pf_status.states -=
1602                                     pf_unlink_state(s, PF_ENTER_LOCKED);
1603                                 goto relock;
1604                         }
1605                         s->rule.ptr->rule_flag |= PFRULE_REFS;
1606                         if (s->nat_rule.ptr != NULL)
1607                                 s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1608                         if (s->anchor.ptr != NULL)
1609                                 s->anchor.ptr->rule_flag |= PFRULE_REFS;
1610                         s->kif->pfik_flags |= PFI_IFLAG_REFS;
1611                         if (s->rt_kif)
1612                                 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1613                 }
1614                 PF_HASHROW_UNLOCK(ih);
1615
1616                 /* Return when we hit end of hash. */
1617                 if (++i > V_pf_hashmask) {
1618                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1619                         return (0);
1620                 }
1621
1622                 maxcheck--;
1623         }
1624
1625         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1626
1627         return (i);
1628 }
1629
1630 static void
1631 pf_purge_unlinked_rules()
1632 {
1633         struct pf_rulequeue tmpq;
1634         struct pf_rule *r, *r1;
1635
1636         /*
1637          * If we have overloading task pending, then we'd
1638          * better skip purging this time. There is a tiny
1639          * probability that overloading task references
1640          * an already unlinked rule.
1641          */
1642         PF_OVERLOADQ_LOCK();
1643         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1644                 PF_OVERLOADQ_UNLOCK();
1645                 return;
1646         }
1647         PF_OVERLOADQ_UNLOCK();
1648
1649         /*
1650          * Do naive mark-and-sweep garbage collecting of old rules.
1651          * Reference flag is raised by pf_purge_expired_states()
1652          * and pf_purge_expired_src_nodes().
1653          *
1654          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1655          * use a temporary queue.
1656          */
1657         TAILQ_INIT(&tmpq);
1658         PF_UNLNKDRULES_LOCK();
1659         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1660                 if (!(r->rule_flag & PFRULE_REFS)) {
1661                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1662                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1663                 } else
1664                         r->rule_flag &= ~PFRULE_REFS;
1665         }
1666         PF_UNLNKDRULES_UNLOCK();
1667
1668         if (!TAILQ_EMPTY(&tmpq)) {
1669                 PF_RULES_WLOCK();
1670                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1671                         TAILQ_REMOVE(&tmpq, r, entries);
1672                         pf_free_rule(r);
1673                 }
1674                 PF_RULES_WUNLOCK();
1675         }
1676 }
1677
1678 void
1679 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1680 {
1681         switch (af) {
1682 #ifdef INET
1683         case AF_INET: {
1684                 u_int32_t a = ntohl(addr->addr32[0]);
1685                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1686                     (a>>8)&255, a&255);
1687                 if (p) {
1688                         p = ntohs(p);
1689                         printf(":%u", p);
1690                 }
1691                 break;
1692         }
1693 #endif /* INET */
1694 #ifdef INET6
1695         case AF_INET6: {
1696                 u_int16_t b;
1697                 u_int8_t i, curstart, curend, maxstart, maxend;
1698                 curstart = curend = maxstart = maxend = 255;
1699                 for (i = 0; i < 8; i++) {
1700                         if (!addr->addr16[i]) {
1701                                 if (curstart == 255)
1702                                         curstart = i;
1703                                 curend = i;
1704                         } else {
1705                                 if ((curend - curstart) >
1706                                     (maxend - maxstart)) {
1707                                         maxstart = curstart;
1708                                         maxend = curend;
1709                                 }
1710                                 curstart = curend = 255;
1711                         }
1712                 }
1713                 if ((curend - curstart) >
1714                     (maxend - maxstart)) {
1715                         maxstart = curstart;
1716                         maxend = curend;
1717                 }
1718                 for (i = 0; i < 8; i++) {
1719                         if (i >= maxstart && i <= maxend) {
1720                                 if (i == 0)
1721                                         printf(":");
1722                                 if (i == maxend)
1723                                         printf(":");
1724                         } else {
1725                                 b = ntohs(addr->addr16[i]);
1726                                 printf("%x", b);
1727                                 if (i < 7)
1728                                         printf(":");
1729                         }
1730                 }
1731                 if (p) {
1732                         p = ntohs(p);
1733                         printf("[%u]", p);
1734                 }
1735                 break;
1736         }
1737 #endif /* INET6 */
1738         }
1739 }
1740
1741 void
1742 pf_print_state(struct pf_state *s)
1743 {
1744         pf_print_state_parts(s, NULL, NULL);
1745 }
1746
1747 static void
1748 pf_print_state_parts(struct pf_state *s,
1749     struct pf_state_key *skwp, struct pf_state_key *sksp)
1750 {
1751         struct pf_state_key *skw, *sks;
1752         u_int8_t proto, dir;
1753
1754         /* Do our best to fill these, but they're skipped if NULL */
1755         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1756         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1757         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1758         dir = s ? s->direction : 0;
1759
1760         switch (proto) {
1761         case IPPROTO_IPV4:
1762                 printf("IPv4");
1763                 break;
1764         case IPPROTO_IPV6:
1765                 printf("IPv6");
1766                 break;
1767         case IPPROTO_TCP:
1768                 printf("TCP");
1769                 break;
1770         case IPPROTO_UDP:
1771                 printf("UDP");
1772                 break;
1773         case IPPROTO_ICMP:
1774                 printf("ICMP");
1775                 break;
1776         case IPPROTO_ICMPV6:
1777                 printf("ICMPv6");
1778                 break;
1779         default:
1780                 printf("%u", skw->proto);
1781                 break;
1782         }
1783         switch (dir) {
1784         case PF_IN:
1785                 printf(" in");
1786                 break;
1787         case PF_OUT:
1788                 printf(" out");
1789                 break;
1790         }
1791         if (skw) {
1792                 printf(" wire: ");
1793                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1794                 printf(" ");
1795                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1796         }
1797         if (sks) {
1798                 printf(" stack: ");
1799                 if (sks != skw) {
1800                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1801                         printf(" ");
1802                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1803                 } else
1804                         printf("-");
1805         }
1806         if (s) {
1807                 if (proto == IPPROTO_TCP) {
1808                         printf(" [lo=%u high=%u win=%u modulator=%u",
1809                             s->src.seqlo, s->src.seqhi,
1810                             s->src.max_win, s->src.seqdiff);
1811                         if (s->src.wscale && s->dst.wscale)
1812                                 printf(" wscale=%u",
1813                                     s->src.wscale & PF_WSCALE_MASK);
1814                         printf("]");
1815                         printf(" [lo=%u high=%u win=%u modulator=%u",
1816                             s->dst.seqlo, s->dst.seqhi,
1817                             s->dst.max_win, s->dst.seqdiff);
1818                         if (s->src.wscale && s->dst.wscale)
1819                                 printf(" wscale=%u",
1820                                 s->dst.wscale & PF_WSCALE_MASK);
1821                         printf("]");
1822                 }
1823                 printf(" %u:%u", s->src.state, s->dst.state);
1824         }
1825 }
1826
1827 void
1828 pf_print_flags(u_int8_t f)
1829 {
1830         if (f)
1831                 printf(" ");
1832         if (f & TH_FIN)
1833                 printf("F");
1834         if (f & TH_SYN)
1835                 printf("S");
1836         if (f & TH_RST)
1837                 printf("R");
1838         if (f & TH_PUSH)
1839                 printf("P");
1840         if (f & TH_ACK)
1841                 printf("A");
1842         if (f & TH_URG)
1843                 printf("U");
1844         if (f & TH_ECE)
1845                 printf("E");
1846         if (f & TH_CWR)
1847                 printf("W");
1848 }
1849
1850 #define PF_SET_SKIP_STEPS(i)                                    \
1851         do {                                                    \
1852                 while (head[i] != cur) {                        \
1853                         head[i]->skip[i].ptr = cur;             \
1854                         head[i] = TAILQ_NEXT(head[i], entries); \
1855                 }                                               \
1856         } while (0)
1857
1858 void
1859 pf_calc_skip_steps(struct pf_rulequeue *rules)
1860 {
1861         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1862         int i;
1863
1864         cur = TAILQ_FIRST(rules);
1865         prev = cur;
1866         for (i = 0; i < PF_SKIP_COUNT; ++i)
1867                 head[i] = cur;
1868         while (cur != NULL) {
1869
1870                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1871                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1872                 if (cur->direction != prev->direction)
1873                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1874                 if (cur->af != prev->af)
1875                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1876                 if (cur->proto != prev->proto)
1877                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1878                 if (cur->src.neg != prev->src.neg ||
1879                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1880                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1881                 if (cur->src.port[0] != prev->src.port[0] ||
1882                     cur->src.port[1] != prev->src.port[1] ||
1883                     cur->src.port_op != prev->src.port_op)
1884                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1885                 if (cur->dst.neg != prev->dst.neg ||
1886                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1887                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1888                 if (cur->dst.port[0] != prev->dst.port[0] ||
1889                     cur->dst.port[1] != prev->dst.port[1] ||
1890                     cur->dst.port_op != prev->dst.port_op)
1891                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1892
1893                 prev = cur;
1894                 cur = TAILQ_NEXT(cur, entries);
1895         }
1896         for (i = 0; i < PF_SKIP_COUNT; ++i)
1897                 PF_SET_SKIP_STEPS(i);
1898 }
1899
1900 static int
1901 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1902 {
1903         if (aw1->type != aw2->type)
1904                 return (1);
1905         switch (aw1->type) {
1906         case PF_ADDR_ADDRMASK:
1907         case PF_ADDR_RANGE:
1908                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1909                         return (1);
1910                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1911                         return (1);
1912                 return (0);
1913         case PF_ADDR_DYNIFTL:
1914                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1915         case PF_ADDR_NOROUTE:
1916         case PF_ADDR_URPFFAILED:
1917                 return (0);
1918         case PF_ADDR_TABLE:
1919                 return (aw1->p.tbl != aw2->p.tbl);
1920         default:
1921                 printf("invalid address type: %d\n", aw1->type);
1922                 return (1);
1923         }
1924 }
1925
1926 u_int16_t
1927 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1928 {
1929         u_int32_t       l;
1930
1931         if (udp && !cksum)
1932                 return (0x0000);
1933         l = cksum + old - new;
1934         l = (l >> 16) + (l & 65535);
1935         l = l & 65535;
1936         if (udp && !l)
1937                 return (0xFFFF);
1938         return (l);
1939 }
1940
1941 static void
1942 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
1943     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
1944 {
1945         struct pf_addr  ao;
1946         u_int16_t       po = *p;
1947
1948         PF_ACPY(&ao, a, af);
1949         PF_ACPY(a, an, af);
1950
1951         *p = pn;
1952
1953         switch (af) {
1954 #ifdef INET
1955         case AF_INET:
1956                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
1957                     ao.addr16[0], an->addr16[0], 0),
1958                     ao.addr16[1], an->addr16[1], 0);
1959                 *p = pn;
1960                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1961                     ao.addr16[0], an->addr16[0], u),
1962                     ao.addr16[1], an->addr16[1], u),
1963                     po, pn, u);
1964                 break;
1965 #endif /* INET */
1966 #ifdef INET6
1967         case AF_INET6:
1968                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1969                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
1970                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
1971                     ao.addr16[0], an->addr16[0], u),
1972                     ao.addr16[1], an->addr16[1], u),
1973                     ao.addr16[2], an->addr16[2], u),
1974                     ao.addr16[3], an->addr16[3], u),
1975                     ao.addr16[4], an->addr16[4], u),
1976                     ao.addr16[5], an->addr16[5], u),
1977                     ao.addr16[6], an->addr16[6], u),
1978                     ao.addr16[7], an->addr16[7], u),
1979                     po, pn, u);
1980                 break;
1981 #endif /* INET6 */
1982         }
1983 }
1984
1985
1986 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
1987 void
1988 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
1989 {
1990         u_int32_t       ao;
1991
1992         memcpy(&ao, a, sizeof(ao));
1993         memcpy(a, &an, sizeof(u_int32_t));
1994         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
1995             ao % 65536, an % 65536, u);
1996 }
1997
1998 #ifdef INET6
1999 static void
2000 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2001 {
2002         struct pf_addr  ao;
2003
2004         PF_ACPY(&ao, a, AF_INET6);
2005         PF_ACPY(a, an, AF_INET6);
2006
2007         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2008             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2009             pf_cksum_fixup(pf_cksum_fixup(*c,
2010             ao.addr16[0], an->addr16[0], u),
2011             ao.addr16[1], an->addr16[1], u),
2012             ao.addr16[2], an->addr16[2], u),
2013             ao.addr16[3], an->addr16[3], u),
2014             ao.addr16[4], an->addr16[4], u),
2015             ao.addr16[5], an->addr16[5], u),
2016             ao.addr16[6], an->addr16[6], u),
2017             ao.addr16[7], an->addr16[7], u);
2018 }
2019 #endif /* INET6 */
2020
2021 static void
2022 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2023     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2024     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2025 {
2026         struct pf_addr  oia, ooa;
2027
2028         PF_ACPY(&oia, ia, af);
2029         if (oa)
2030                 PF_ACPY(&ooa, oa, af);
2031
2032         /* Change inner protocol port, fix inner protocol checksum. */
2033         if (ip != NULL) {
2034                 u_int16_t       oip = *ip;
2035                 u_int32_t       opc;
2036
2037                 if (pc != NULL)
2038                         opc = *pc;
2039                 *ip = np;
2040                 if (pc != NULL)
2041                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2042                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2043                 if (pc != NULL)
2044                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2045         }
2046         /* Change inner ip address, fix inner ip and icmp checksums. */
2047         PF_ACPY(ia, na, af);
2048         switch (af) {
2049 #ifdef INET
2050         case AF_INET: {
2051                 u_int32_t        oh2c = *h2c;
2052
2053                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2054                     oia.addr16[0], ia->addr16[0], 0),
2055                     oia.addr16[1], ia->addr16[1], 0);
2056                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2057                     oia.addr16[0], ia->addr16[0], 0),
2058                     oia.addr16[1], ia->addr16[1], 0);
2059                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2060                 break;
2061         }
2062 #endif /* INET */
2063 #ifdef INET6
2064         case AF_INET6:
2065                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2066                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2067                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2068                     oia.addr16[0], ia->addr16[0], u),
2069                     oia.addr16[1], ia->addr16[1], u),
2070                     oia.addr16[2], ia->addr16[2], u),
2071                     oia.addr16[3], ia->addr16[3], u),
2072                     oia.addr16[4], ia->addr16[4], u),
2073                     oia.addr16[5], ia->addr16[5], u),
2074                     oia.addr16[6], ia->addr16[6], u),
2075                     oia.addr16[7], ia->addr16[7], u);
2076                 break;
2077 #endif /* INET6 */
2078         }
2079         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2080         if (oa) {
2081                 PF_ACPY(oa, na, af);
2082                 switch (af) {
2083 #ifdef INET
2084                 case AF_INET:
2085                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2086                             ooa.addr16[0], oa->addr16[0], 0),
2087                             ooa.addr16[1], oa->addr16[1], 0);
2088                         break;
2089 #endif /* INET */
2090 #ifdef INET6
2091                 case AF_INET6:
2092                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2093                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2094                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2095                             ooa.addr16[0], oa->addr16[0], u),
2096                             ooa.addr16[1], oa->addr16[1], u),
2097                             ooa.addr16[2], oa->addr16[2], u),
2098                             ooa.addr16[3], oa->addr16[3], u),
2099                             ooa.addr16[4], oa->addr16[4], u),
2100                             ooa.addr16[5], oa->addr16[5], u),
2101                             ooa.addr16[6], oa->addr16[6], u),
2102                             ooa.addr16[7], oa->addr16[7], u);
2103                         break;
2104 #endif /* INET6 */
2105                 }
2106         }
2107 }
2108
2109
2110 /*
2111  * Need to modulate the sequence numbers in the TCP SACK option
2112  * (credits to Krzysztof Pfaff for report and patch)
2113  */
2114 static int
2115 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2116     struct tcphdr *th, struct pf_state_peer *dst)
2117 {
2118         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2119         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2120         int copyback = 0, i, olen;
2121         struct sackblk sack;
2122
2123 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2124         if (hlen < TCPOLEN_SACKLEN ||
2125             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2126                 return 0;
2127
2128         while (hlen >= TCPOLEN_SACKLEN) {
2129                 olen = opt[1];
2130                 switch (*opt) {
2131                 case TCPOPT_EOL:        /* FALLTHROUGH */
2132                 case TCPOPT_NOP:
2133                         opt++;
2134                         hlen--;
2135                         break;
2136                 case TCPOPT_SACK:
2137                         if (olen > hlen)
2138                                 olen = hlen;
2139                         if (olen >= TCPOLEN_SACKLEN) {
2140                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2141                                     i += TCPOLEN_SACK) {
2142                                         memcpy(&sack, &opt[i], sizeof(sack));
2143                                         pf_change_a(&sack.start, &th->th_sum,
2144                                             htonl(ntohl(sack.start) -
2145                                             dst->seqdiff), 0);
2146                                         pf_change_a(&sack.end, &th->th_sum,
2147                                             htonl(ntohl(sack.end) -
2148                                             dst->seqdiff), 0);
2149                                         memcpy(&opt[i], &sack, sizeof(sack));
2150                                 }
2151                                 copyback = 1;
2152                         }
2153                         /* FALLTHROUGH */
2154                 default:
2155                         if (olen < 2)
2156                                 olen = 2;
2157                         hlen -= olen;
2158                         opt += olen;
2159                 }
2160         }
2161
2162         if (copyback)
2163                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2164         return (copyback);
2165 }
2166
2167 static void
2168 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2169     const struct pf_addr *saddr, const struct pf_addr *daddr,
2170     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2171     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2172     u_int16_t rtag, struct ifnet *ifp)
2173 {
2174         struct pf_send_entry *pfse;
2175         struct mbuf     *m;
2176         int              len, tlen;
2177 #ifdef INET
2178         struct ip       *h = NULL;
2179 #endif /* INET */
2180 #ifdef INET6
2181         struct ip6_hdr  *h6 = NULL;
2182 #endif /* INET6 */
2183         struct tcphdr   *th;
2184         char            *opt;
2185         struct pf_mtag  *pf_mtag;
2186
2187         len = 0;
2188         th = NULL;
2189
2190         /* maximum segment size tcp option */
2191         tlen = sizeof(struct tcphdr);
2192         if (mss)
2193                 tlen += 4;
2194
2195         switch (af) {
2196 #ifdef INET
2197         case AF_INET:
2198                 len = sizeof(struct ip) + tlen;
2199                 break;
2200 #endif /* INET */
2201 #ifdef INET6
2202         case AF_INET6:
2203                 len = sizeof(struct ip6_hdr) + tlen;
2204                 break;
2205 #endif /* INET6 */
2206         default:
2207                 panic("%s: unsupported af %d", __func__, af);
2208         }
2209
2210         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2211         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2212         if (pfse == NULL)
2213                 return;
2214         m = m_gethdr(M_NOWAIT, MT_DATA);
2215         if (m == NULL) {
2216                 free(pfse, M_PFTEMP);
2217                 return;
2218         }
2219 #ifdef MAC
2220         mac_netinet_firewall_send(m);
2221 #endif
2222         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2223                 free(pfse, M_PFTEMP);
2224                 m_freem(m);
2225                 return;
2226         }
2227         if (tag)
2228                 m->m_flags |= M_SKIP_FIREWALL;
2229         pf_mtag->tag = rtag;
2230
2231         if (r != NULL && r->rtableid >= 0)
2232                 M_SETFIB(m, r->rtableid);
2233
2234 #ifdef ALTQ
2235         if (r != NULL && r->qid) {
2236                 pf_mtag->qid = r->qid;
2237
2238                 /* add hints for ecn */
2239                 pf_mtag->hdr = mtod(m, struct ip *);
2240         }
2241 #endif /* ALTQ */
2242         m->m_data += max_linkhdr;
2243         m->m_pkthdr.len = m->m_len = len;
2244         m->m_pkthdr.rcvif = NULL;
2245         bzero(m->m_data, len);
2246         switch (af) {
2247 #ifdef INET
2248         case AF_INET:
2249                 h = mtod(m, struct ip *);
2250
2251                 /* IP header fields included in the TCP checksum */
2252                 h->ip_p = IPPROTO_TCP;
2253                 h->ip_len = htons(tlen);
2254                 h->ip_src.s_addr = saddr->v4.s_addr;
2255                 h->ip_dst.s_addr = daddr->v4.s_addr;
2256
2257                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2258                 break;
2259 #endif /* INET */
2260 #ifdef INET6
2261         case AF_INET6:
2262                 h6 = mtod(m, struct ip6_hdr *);
2263
2264                 /* IP header fields included in the TCP checksum */
2265                 h6->ip6_nxt = IPPROTO_TCP;
2266                 h6->ip6_plen = htons(tlen);
2267                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2268                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2269
2270                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2271                 break;
2272 #endif /* INET6 */
2273         }
2274
2275         /* TCP header */
2276         th->th_sport = sport;
2277         th->th_dport = dport;
2278         th->th_seq = htonl(seq);
2279         th->th_ack = htonl(ack);
2280         th->th_off = tlen >> 2;
2281         th->th_flags = flags;
2282         th->th_win = htons(win);
2283
2284         if (mss) {
2285                 opt = (char *)(th + 1);
2286                 opt[0] = TCPOPT_MAXSEG;
2287                 opt[1] = 4;
2288                 HTONS(mss);
2289                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2290         }
2291
2292         switch (af) {
2293 #ifdef INET
2294         case AF_INET:
2295                 /* TCP checksum */
2296                 th->th_sum = in_cksum(m, len);
2297
2298                 /* Finish the IP header */
2299                 h->ip_v = 4;
2300                 h->ip_hl = sizeof(*h) >> 2;
2301                 h->ip_tos = IPTOS_LOWDELAY;
2302                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2303                 h->ip_len = htons(len);
2304                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2305                 h->ip_sum = 0;
2306
2307                 pfse->pfse_type = PFSE_IP;
2308                 break;
2309 #endif /* INET */
2310 #ifdef INET6
2311         case AF_INET6:
2312                 /* TCP checksum */
2313                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2314                     sizeof(struct ip6_hdr), tlen);
2315
2316                 h6->ip6_vfc |= IPV6_VERSION;
2317                 h6->ip6_hlim = IPV6_DEFHLIM;
2318
2319                 pfse->pfse_type = PFSE_IP6;
2320                 break;
2321 #endif /* INET6 */
2322         }
2323         pfse->pfse_m = m;
2324         pf_send(pfse);
2325 }
2326
2327 static void
2328 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2329     struct pf_rule *r)
2330 {
2331         struct pf_send_entry *pfse;
2332         struct mbuf *m0;
2333         struct pf_mtag *pf_mtag;
2334
2335         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2336         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2337         if (pfse == NULL)
2338                 return;
2339
2340         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2341                 free(pfse, M_PFTEMP);
2342                 return;
2343         }
2344
2345         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2346                 free(pfse, M_PFTEMP);
2347                 return;
2348         }
2349         /* XXX: revisit */
2350         m0->m_flags |= M_SKIP_FIREWALL;
2351
2352         if (r->rtableid >= 0)
2353                 M_SETFIB(m0, r->rtableid);
2354
2355 #ifdef ALTQ
2356         if (r->qid) {
2357                 pf_mtag->qid = r->qid;
2358                 /* add hints for ecn */
2359                 pf_mtag->hdr = mtod(m0, struct ip *);
2360         }
2361 #endif /* ALTQ */
2362
2363         switch (af) {
2364 #ifdef INET
2365         case AF_INET:
2366                 pfse->pfse_type = PFSE_ICMP;
2367                 break;
2368 #endif /* INET */
2369 #ifdef INET6
2370         case AF_INET6:
2371                 pfse->pfse_type = PFSE_ICMP6;
2372                 break;
2373 #endif /* INET6 */
2374         }
2375         pfse->pfse_m = m0;
2376         pfse->pfse_icmp_type = type;
2377         pfse->pfse_icmp_code = code;
2378         pf_send(pfse);
2379 }
2380
2381 /*
2382  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2383  * If n is 0, they match if they are equal. If n is != 0, they match if they
2384  * are different.
2385  */
2386 int
2387 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2388     struct pf_addr *b, sa_family_t af)
2389 {
2390         int     match = 0;
2391
2392         switch (af) {
2393 #ifdef INET
2394         case AF_INET:
2395                 if ((a->addr32[0] & m->addr32[0]) ==
2396                     (b->addr32[0] & m->addr32[0]))
2397                         match++;
2398                 break;
2399 #endif /* INET */
2400 #ifdef INET6
2401         case AF_INET6:
2402                 if (((a->addr32[0] & m->addr32[0]) ==
2403                      (b->addr32[0] & m->addr32[0])) &&
2404                     ((a->addr32[1] & m->addr32[1]) ==
2405                      (b->addr32[1] & m->addr32[1])) &&
2406                     ((a->addr32[2] & m->addr32[2]) ==
2407                      (b->addr32[2] & m->addr32[2])) &&
2408                     ((a->addr32[3] & m->addr32[3]) ==
2409                      (b->addr32[3] & m->addr32[3])))
2410                         match++;
2411                 break;
2412 #endif /* INET6 */
2413         }
2414         if (match) {
2415                 if (n)
2416                         return (0);
2417                 else
2418                         return (1);
2419         } else {
2420                 if (n)
2421                         return (1);
2422                 else
2423                         return (0);
2424         }
2425 }
2426
2427 /*
2428  * Return 1 if b <= a <= e, otherwise return 0.
2429  */
2430 int
2431 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2432     struct pf_addr *a, sa_family_t af)
2433 {
2434         switch (af) {
2435 #ifdef INET
2436         case AF_INET:
2437                 if ((a->addr32[0] < b->addr32[0]) ||
2438                     (a->addr32[0] > e->addr32[0]))
2439                         return (0);
2440                 break;
2441 #endif /* INET */
2442 #ifdef INET6
2443         case AF_INET6: {
2444                 int     i;
2445
2446                 /* check a >= b */
2447                 for (i = 0; i < 4; ++i)
2448                         if (a->addr32[i] > b->addr32[i])
2449                                 break;
2450                         else if (a->addr32[i] < b->addr32[i])
2451                                 return (0);
2452                 /* check a <= e */
2453                 for (i = 0; i < 4; ++i)
2454                         if (a->addr32[i] < e->addr32[i])
2455                                 break;
2456                         else if (a->addr32[i] > e->addr32[i])
2457                                 return (0);
2458                 break;
2459         }
2460 #endif /* INET6 */
2461         }
2462         return (1);
2463 }
2464
2465 static int
2466 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2467 {
2468         switch (op) {
2469         case PF_OP_IRG:
2470                 return ((p > a1) && (p < a2));
2471         case PF_OP_XRG:
2472                 return ((p < a1) || (p > a2));
2473         case PF_OP_RRG:
2474                 return ((p >= a1) && (p <= a2));
2475         case PF_OP_EQ:
2476                 return (p == a1);
2477         case PF_OP_NE:
2478                 return (p != a1);
2479         case PF_OP_LT:
2480                 return (p < a1);
2481         case PF_OP_LE:
2482                 return (p <= a1);
2483         case PF_OP_GT:
2484                 return (p > a1);
2485         case PF_OP_GE:
2486                 return (p >= a1);
2487         }
2488         return (0); /* never reached */
2489 }
2490
2491 int
2492 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2493 {
2494         NTOHS(a1);
2495         NTOHS(a2);
2496         NTOHS(p);
2497         return (pf_match(op, a1, a2, p));
2498 }
2499
2500 static int
2501 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2502 {
2503         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2504                 return (0);
2505         return (pf_match(op, a1, a2, u));
2506 }
2507
2508 static int
2509 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2510 {
2511         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2512                 return (0);
2513         return (pf_match(op, a1, a2, g));
2514 }
2515
2516 int
2517 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2518 {
2519         if (*tag == -1)
2520                 *tag = mtag;
2521
2522         return ((!r->match_tag_not && r->match_tag == *tag) ||
2523             (r->match_tag_not && r->match_tag != *tag));
2524 }
2525
2526 int
2527 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2528 {
2529
2530         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2531
2532         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2533                 return (ENOMEM);
2534
2535         pd->pf_mtag->tag = tag;
2536
2537         return (0);
2538 }
2539
2540 #define PF_ANCHOR_STACKSIZE     32
2541 struct pf_anchor_stackframe {
2542         struct pf_ruleset       *rs;
2543         struct pf_rule          *r;     /* XXX: + match bit */
2544         struct pf_anchor        *child;
2545 };
2546
2547 /*
2548  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2549  */
2550 #define PF_ANCHORSTACK_MATCH    0x00000001
2551 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2552
2553 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2554 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2555                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2556 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2557                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2558 } while (0)
2559
2560 void
2561 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2562     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2563     int *match)
2564 {
2565         struct pf_anchor_stackframe     *f;
2566
2567         PF_RULES_RASSERT();
2568
2569         if (match)
2570                 *match = 0;
2571         if (*depth >= PF_ANCHOR_STACKSIZE) {
2572                 printf("%s: anchor stack overflow on %s\n",
2573                     __func__, (*r)->anchor->name);
2574                 *r = TAILQ_NEXT(*r, entries);
2575                 return;
2576         } else if (*depth == 0 && a != NULL)
2577                 *a = *r;
2578         f = stack + (*depth)++;
2579         f->rs = *rs;
2580         f->r = *r;
2581         if ((*r)->anchor_wildcard) {
2582                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2583
2584                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2585                         *r = NULL;
2586                         return;
2587                 }
2588                 *rs = &f->child->ruleset;
2589         } else {
2590                 f->child = NULL;
2591                 *rs = &(*r)->anchor->ruleset;
2592         }
2593         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2594 }
2595
2596 int
2597 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2598     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2599     int *match)
2600 {
2601         struct pf_anchor_stackframe     *f;
2602         struct pf_rule *fr;
2603         int quick = 0;
2604
2605         PF_RULES_RASSERT();
2606
2607         do {
2608                 if (*depth <= 0)
2609                         break;
2610                 f = stack + *depth - 1;
2611                 fr = PF_ANCHOR_RULE(f);
2612                 if (f->child != NULL) {
2613                         struct pf_anchor_node *parent;
2614
2615                         /*
2616                          * This block traverses through
2617                          * a wildcard anchor.
2618                          */
2619                         parent = &fr->anchor->children;
2620                         if (match != NULL && *match) {
2621                                 /*
2622                                  * If any of "*" matched, then
2623                                  * "foo/ *" matched, mark frame
2624                                  * appropriately.
2625                                  */
2626                                 PF_ANCHOR_SET_MATCH(f);
2627                                 *match = 0;
2628                         }
2629                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2630                         if (f->child != NULL) {
2631                                 *rs = &f->child->ruleset;
2632                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2633                                 if (*r == NULL)
2634                                         continue;
2635                                 else
2636                                         break;
2637                         }
2638                 }
2639                 (*depth)--;
2640                 if (*depth == 0 && a != NULL)
2641                         *a = NULL;
2642                 *rs = f->rs;
2643                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2644                         quick = fr->quick;
2645                 *r = TAILQ_NEXT(fr, entries);
2646         } while (*r == NULL);
2647
2648         return (quick);
2649 }
2650
2651 #ifdef INET6
2652 void
2653 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2654     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2655 {
2656         switch (af) {
2657 #ifdef INET
2658         case AF_INET:
2659                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2660                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2661                 break;
2662 #endif /* INET */
2663         case AF_INET6:
2664                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2665                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2666                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2667                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2668                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2669                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2670                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2671                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2672                 break;
2673         }
2674 }
2675
2676 void
2677 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2678 {
2679         switch (af) {
2680 #ifdef INET
2681         case AF_INET:
2682                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2683                 break;
2684 #endif /* INET */
2685         case AF_INET6:
2686                 if (addr->addr32[3] == 0xffffffff) {
2687                         addr->addr32[3] = 0;
2688                         if (addr->addr32[2] == 0xffffffff) {
2689                                 addr->addr32[2] = 0;
2690                                 if (addr->addr32[1] == 0xffffffff) {
2691                                         addr->addr32[1] = 0;
2692                                         addr->addr32[0] =
2693                                             htonl(ntohl(addr->addr32[0]) + 1);
2694                                 } else
2695                                         addr->addr32[1] =
2696                                             htonl(ntohl(addr->addr32[1]) + 1);
2697                         } else
2698                                 addr->addr32[2] =
2699                                     htonl(ntohl(addr->addr32[2]) + 1);
2700                 } else
2701                         addr->addr32[3] =
2702                             htonl(ntohl(addr->addr32[3]) + 1);
2703                 break;
2704         }
2705 }
2706 #endif /* INET6 */
2707
2708 int
2709 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
2710 {
2711         struct pf_addr          *saddr, *daddr;
2712         u_int16_t                sport, dport;
2713         struct inpcbinfo        *pi;
2714         struct inpcb            *inp;
2715
2716         pd->lookup.uid = UID_MAX;
2717         pd->lookup.gid = GID_MAX;
2718
2719         switch (pd->proto) {
2720         case IPPROTO_TCP:
2721                 if (pd->hdr.tcp == NULL)
2722                         return (-1);
2723                 sport = pd->hdr.tcp->th_sport;
2724                 dport = pd->hdr.tcp->th_dport;
2725                 pi = &V_tcbinfo;
2726                 break;
2727         case IPPROTO_UDP:
2728                 if (pd->hdr.udp == NULL)
2729                         return (-1);
2730                 sport = pd->hdr.udp->uh_sport;
2731                 dport = pd->hdr.udp->uh_dport;
2732                 pi = &V_udbinfo;
2733                 break;
2734         default:
2735                 return (-1);
2736         }
2737         if (direction == PF_IN) {
2738                 saddr = pd->src;
2739                 daddr = pd->dst;
2740         } else {
2741                 u_int16_t       p;
2742
2743                 p = sport;
2744                 sport = dport;
2745                 dport = p;
2746                 saddr = pd->dst;
2747                 daddr = pd->src;
2748         }
2749         switch (pd->af) {
2750 #ifdef INET
2751         case AF_INET:
2752                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
2753                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2754                 if (inp == NULL) {
2755                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
2756                            daddr->v4, dport, INPLOOKUP_WILDCARD |
2757                            INPLOOKUP_RLOCKPCB, NULL, m);
2758                         if (inp == NULL)
2759                                 return (-1);
2760                 }
2761                 break;
2762 #endif /* INET */
2763 #ifdef INET6
2764         case AF_INET6:
2765                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
2766                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2767                 if (inp == NULL) {
2768                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
2769                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
2770                             INPLOOKUP_RLOCKPCB, NULL, m);
2771                         if (inp == NULL)
2772                                 return (-1);
2773                 }
2774                 break;
2775 #endif /* INET6 */
2776
2777         default:
2778                 return (-1);
2779         }
2780         INP_RLOCK_ASSERT(inp);
2781         pd->lookup.uid = inp->inp_cred->cr_uid;
2782         pd->lookup.gid = inp->inp_cred->cr_groups[0];
2783         INP_RUNLOCK(inp);
2784
2785         return (1);
2786 }
2787
2788 static u_int8_t
2789 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2790 {
2791         int              hlen;
2792         u_int8_t         hdr[60];
2793         u_int8_t        *opt, optlen;
2794         u_int8_t         wscale = 0;
2795
2796         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2797         if (hlen <= sizeof(struct tcphdr))
2798                 return (0);
2799         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2800                 return (0);
2801         opt = hdr + sizeof(struct tcphdr);
2802         hlen -= sizeof(struct tcphdr);
2803         while (hlen >= 3) {
2804                 switch (*opt) {
2805                 case TCPOPT_EOL:
2806                 case TCPOPT_NOP:
2807                         ++opt;
2808                         --hlen;
2809                         break;
2810                 case TCPOPT_WINDOW:
2811                         wscale = opt[2];
2812                         if (wscale > TCP_MAX_WINSHIFT)
2813                                 wscale = TCP_MAX_WINSHIFT;
2814                         wscale |= PF_WSCALE_FLAG;
2815                         /* FALLTHROUGH */
2816                 default:
2817                         optlen = opt[1];
2818                         if (optlen < 2)
2819                                 optlen = 2;
2820                         hlen -= optlen;
2821                         opt += optlen;
2822                         break;
2823                 }
2824         }
2825         return (wscale);
2826 }
2827
2828 static u_int16_t
2829 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2830 {
2831         int              hlen;
2832         u_int8_t         hdr[60];
2833         u_int8_t        *opt, optlen;
2834         u_int16_t        mss = V_tcp_mssdflt;
2835
2836         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
2837         if (hlen <= sizeof(struct tcphdr))
2838                 return (0);
2839         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2840                 return (0);
2841         opt = hdr + sizeof(struct tcphdr);
2842         hlen -= sizeof(struct tcphdr);
2843         while (hlen >= TCPOLEN_MAXSEG) {
2844                 switch (*opt) {
2845                 case TCPOPT_EOL:
2846                 case TCPOPT_NOP:
2847                         ++opt;
2848                         --hlen;
2849                         break;
2850                 case TCPOPT_MAXSEG:
2851                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2852                         NTOHS(mss);
2853                         /* FALLTHROUGH */
2854                 default:
2855                         optlen = opt[1];
2856                         if (optlen < 2)
2857                                 optlen = 2;
2858                         hlen -= optlen;
2859                         opt += optlen;
2860                         break;
2861                 }
2862         }
2863         return (mss);
2864 }
2865
2866 static u_int16_t
2867 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
2868 {
2869 #ifdef INET
2870         struct sockaddr_in      *dst;
2871         struct route             ro;
2872 #endif /* INET */
2873 #ifdef INET6
2874         struct sockaddr_in6     *dst6;
2875         struct route_in6         ro6;
2876 #endif /* INET6 */
2877         struct rtentry          *rt = NULL;
2878         int                      hlen = 0;
2879         u_int16_t                mss = V_tcp_mssdflt;
2880
2881         switch (af) {
2882 #ifdef INET
2883         case AF_INET:
2884                 hlen = sizeof(struct ip);
2885                 bzero(&ro, sizeof(ro));
2886                 dst = (struct sockaddr_in *)&ro.ro_dst;
2887                 dst->sin_family = AF_INET;
2888                 dst->sin_len = sizeof(*dst);
2889                 dst->sin_addr = addr->v4;
2890                 in_rtalloc_ign(&ro, 0, rtableid);
2891                 rt = ro.ro_rt;
2892                 break;
2893 #endif /* INET */
2894 #ifdef INET6
2895         case AF_INET6:
2896                 hlen = sizeof(struct ip6_hdr);
2897                 bzero(&ro6, sizeof(ro6));
2898                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2899                 dst6->sin6_family = AF_INET6;
2900                 dst6->sin6_len = sizeof(*dst6);
2901                 dst6->sin6_addr = addr->v6;
2902                 in6_rtalloc_ign(&ro6, 0, rtableid);
2903                 rt = ro6.ro_rt;
2904                 break;
2905 #endif /* INET6 */
2906         }
2907
2908         if (rt && rt->rt_ifp) {
2909                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
2910                 mss = max(V_tcp_mssdflt, mss);
2911                 RTFREE(rt);
2912         }
2913         mss = min(mss, offer);
2914         mss = max(mss, 64);             /* sanity - at least max opt space */
2915         return (mss);
2916 }
2917
2918 static void
2919 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
2920 {
2921         struct pf_rule *r = s->rule.ptr;
2922         struct pf_src_node *sn = NULL;
2923
2924         s->rt_kif = NULL;
2925         if (!r->rt || r->rt == PF_FASTROUTE)
2926                 return;
2927         switch (s->key[PF_SK_WIRE]->af) {
2928 #ifdef INET
2929         case AF_INET:
2930                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL, &sn);
2931                 s->rt_kif = r->rpool.cur->kif;
2932                 break;
2933 #endif /* INET */
2934 #ifdef INET6
2935         case AF_INET6:
2936                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL, &sn);
2937                 s->rt_kif = r->rpool.cur->kif;
2938                 break;
2939 #endif /* INET6 */
2940         }
2941 }
2942
2943 static u_int32_t
2944 pf_tcp_iss(struct pf_pdesc *pd)
2945 {
2946         MD5_CTX ctx;
2947         u_int32_t digest[4];
2948
2949         if (V_pf_tcp_secret_init == 0) {
2950                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
2951                 MD5Init(&V_pf_tcp_secret_ctx);
2952                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
2953                     sizeof(V_pf_tcp_secret));
2954                 V_pf_tcp_secret_init = 1;
2955         }
2956
2957         ctx = V_pf_tcp_secret_ctx;
2958
2959         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
2960         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
2961         if (pd->af == AF_INET6) {
2962                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
2963                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
2964         } else {
2965                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
2966                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
2967         }
2968         MD5Final((u_char *)digest, &ctx);
2969         V_pf_tcp_iss_off += 4096;
2970 #define ISN_RANDOM_INCREMENT (4096 - 1)
2971         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
2972             V_pf_tcp_iss_off);
2973 #undef  ISN_RANDOM_INCREMENT
2974 }
2975
2976 static int
2977 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
2978     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
2979     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
2980 {
2981         struct pf_rule          *nr = NULL;
2982         struct pf_addr          * const saddr = pd->src;
2983         struct pf_addr          * const daddr = pd->dst;
2984         sa_family_t              af = pd->af;
2985         struct pf_rule          *r, *a = NULL;
2986         struct pf_ruleset       *ruleset = NULL;
2987         struct pf_src_node      *nsn = NULL;
2988         struct tcphdr           *th = pd->hdr.tcp;
2989         struct pf_state_key     *sk = NULL, *nk = NULL;
2990         u_short                  reason;
2991         int                      rewrite = 0, hdrlen = 0;
2992         int                      tag = -1, rtableid = -1;
2993         int                      asd = 0;
2994         int                      match = 0;
2995         int                      state_icmp = 0;
2996         u_int16_t                sport = 0, dport = 0;
2997         u_int16_t                bproto_sum = 0, bip_sum = 0;
2998         u_int8_t                 icmptype = 0, icmpcode = 0;
2999         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3000
3001         PF_RULES_RASSERT();
3002
3003         if (inp != NULL) {
3004                 INP_LOCK_ASSERT(inp);
3005                 pd->lookup.uid = inp->inp_cred->cr_uid;
3006                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3007                 pd->lookup.done = 1;
3008         }
3009
3010         switch (pd->proto) {
3011         case IPPROTO_TCP:
3012                 sport = th->th_sport;
3013                 dport = th->th_dport;
3014                 hdrlen = sizeof(*th);
3015                 break;
3016         case IPPROTO_UDP:
3017                 sport = pd->hdr.udp->uh_sport;
3018                 dport = pd->hdr.udp->uh_dport;
3019                 hdrlen = sizeof(*pd->hdr.udp);
3020                 break;
3021 #ifdef INET
3022         case IPPROTO_ICMP:
3023                 if (pd->af != AF_INET)
3024                         break;
3025                 sport = dport = pd->hdr.icmp->icmp_id;
3026                 hdrlen = sizeof(*pd->hdr.icmp);
3027                 icmptype = pd->hdr.icmp->icmp_type;
3028                 icmpcode = pd->hdr.icmp->icmp_code;
3029
3030                 if (icmptype == ICMP_UNREACH ||
3031                     icmptype == ICMP_SOURCEQUENCH ||
3032                     icmptype == ICMP_REDIRECT ||
3033                     icmptype == ICMP_TIMXCEED ||
3034                     icmptype == ICMP_PARAMPROB)
3035                         state_icmp++;
3036                 break;
3037 #endif /* INET */
3038 #ifdef INET6
3039         case IPPROTO_ICMPV6:
3040                 if (af != AF_INET6)
3041                         break;
3042                 sport = dport = pd->hdr.icmp6->icmp6_id;
3043                 hdrlen = sizeof(*pd->hdr.icmp6);
3044                 icmptype = pd->hdr.icmp6->icmp6_type;
3045                 icmpcode = pd->hdr.icmp6->icmp6_code;
3046
3047                 if (icmptype == ICMP6_DST_UNREACH ||
3048                     icmptype == ICMP6_PACKET_TOO_BIG ||
3049                     icmptype == ICMP6_TIME_EXCEEDED ||
3050                     icmptype == ICMP6_PARAM_PROB)
3051                         state_icmp++;
3052                 break;
3053 #endif /* INET6 */
3054         default:
3055                 sport = dport = hdrlen = 0;
3056                 break;
3057         }
3058
3059         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3060
3061         /* check packet for BINAT/NAT/RDR */
3062         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3063             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3064                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3065                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3066
3067                 if (pd->ip_sum)
3068                         bip_sum = *pd->ip_sum;
3069
3070                 switch (pd->proto) {
3071                 case IPPROTO_TCP:
3072                         bproto_sum = th->th_sum;
3073                         pd->proto_sum = &th->th_sum;
3074
3075                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3076                             nk->port[pd->sidx] != sport) {
3077                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
3078                                     &th->th_sum, &nk->addr[pd->sidx],
3079                                     nk->port[pd->sidx], 0, af);
3080                                 pd->sport = &th->th_sport;
3081                                 sport = th->th_sport;
3082                         }
3083
3084                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3085                             nk->port[pd->didx] != dport) {
3086                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
3087                                     &th->th_sum, &nk->addr[pd->didx],
3088                                     nk->port[pd->didx], 0, af);
3089                                 dport = th->th_dport;
3090                                 pd->dport = &th->th_dport;
3091                         }
3092                         rewrite++;
3093                         break;
3094                 case IPPROTO_UDP:
3095                         bproto_sum = pd->hdr.udp->uh_sum;
3096                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3097
3098                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3099                             nk->port[pd->sidx] != sport) {
3100                                 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
3101                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3102                                     &nk->addr[pd->sidx],
3103                                     nk->port[pd->sidx], 1, af);
3104                                 sport = pd->hdr.udp->uh_sport;
3105                                 pd->sport = &pd->hdr.udp->uh_sport;
3106                         }
3107
3108                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3109                             nk->port[pd->didx] != dport) {
3110                                 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
3111                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3112                                     &nk->addr[pd->didx],
3113                                     nk->port[pd->didx], 1, af);
3114                                 dport = pd->hdr.udp->uh_dport;
3115                                 pd->dport = &pd->hdr.udp->uh_dport;
3116                         }
3117                         rewrite++;
3118                         break;
3119 #ifdef INET
3120                 case IPPROTO_ICMP:
3121                         nk->port[0] = nk->port[1];
3122                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3123                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3124                                     nk->addr[pd->sidx].v4.s_addr, 0);
3125
3126                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3127                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3128                                     nk->addr[pd->didx].v4.s_addr, 0);
3129
3130                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3131                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3132                                     pd->hdr.icmp->icmp_cksum, sport,
3133                                     nk->port[1], 0);
3134                                 pd->hdr.icmp->icmp_id = nk->port[1];
3135                                 pd->sport = &pd->hdr.icmp->icmp_id;
3136                         }
3137                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3138                         break;
3139 #endif /* INET */
3140 #ifdef INET6
3141                 case IPPROTO_ICMPV6:
3142                         nk->port[0] = nk->port[1];
3143                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3144                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3145                                     &nk->addr[pd->sidx], 0);
3146
3147                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3148                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3149                                     &nk->addr[pd->didx], 0);
3150                         rewrite++;
3151                         break;
3152 #endif /* INET */
3153                 default:
3154                         switch (af) {
3155 #ifdef INET
3156                         case AF_INET:
3157                                 if (PF_ANEQ(saddr,
3158                                     &nk->addr[pd->sidx], AF_INET))
3159                                         pf_change_a(&saddr->v4.s_addr,
3160                                             pd->ip_sum,
3161                                             nk->addr[pd->sidx].v4.s_addr, 0);
3162
3163                                 if (PF_ANEQ(daddr,
3164                                     &nk->addr[pd->didx], AF_INET))
3165                                         pf_change_a(&daddr->v4.s_addr,
3166                                             pd->ip_sum,
3167                                             nk->addr[pd->didx].v4.s_addr, 0);
3168                                 break;
3169 #endif /* INET */
3170 #ifdef INET6
3171                         case AF_INET6:
3172                                 if (PF_ANEQ(saddr,
3173                                     &nk->addr[pd->sidx], AF_INET6))
3174                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3175
3176                                 if (PF_ANEQ(daddr,
3177                                     &nk->addr[pd->didx], AF_INET6))
3178                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3179                                 break;
3180 #endif /* INET */
3181                         }
3182                         break;
3183                 }
3184                 if (nr->natpass)
3185                         r = NULL;
3186                 pd->nat_rule = nr;
3187         }
3188
3189         while (r != NULL) {
3190                 r->evaluations++;
3191                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3192                         r = r->skip[PF_SKIP_IFP].ptr;
3193                 else if (r->direction && r->direction != direction)
3194                         r = r->skip[PF_SKIP_DIR].ptr;
3195                 else if (r->af && r->af != af)
3196                         r = r->skip[PF_SKIP_AF].ptr;
3197                 else if (r->proto && r->proto != pd->proto)
3198                         r = r->skip[PF_SKIP_PROTO].ptr;
3199                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3200                     r->src.neg, kif, M_GETFIB(m)))
3201                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3202                 /* tcp/udp only. port_op always 0 in other cases */
3203                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3204                     r->src.port[0], r->src.port[1], sport))
3205                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3206                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3207                     r->dst.neg, NULL, M_GETFIB(m)))
3208                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3209                 /* tcp/udp only. port_op always 0 in other cases */
3210                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3211                     r->dst.port[0], r->dst.port[1], dport))
3212                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3213                 /* icmp only. type always 0 in other cases */
3214                 else if (r->type && r->type != icmptype + 1)
3215                         r = TAILQ_NEXT(r, entries);
3216                 /* icmp only. type always 0 in other cases */
3217                 else if (r->code && r->code != icmpcode + 1)
3218                         r = TAILQ_NEXT(r, entries);
3219                 else if (r->tos && !(r->tos == pd->tos))
3220                         r = TAILQ_NEXT(r, entries);
3221                 else if (r->rule_flag & PFRULE_FRAGMENT)
3222                         r = TAILQ_NEXT(r, entries);
3223                 else if (pd->proto == IPPROTO_TCP &&
3224                     (r->flagset & th->th_flags) != r->flags)
3225                         r = TAILQ_NEXT(r, entries);
3226                 /* tcp/udp only. uid.op always 0 in other cases */
3227                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3228                     pf_socket_lookup(direction, pd, m), 1)) &&
3229                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3230                     pd->lookup.uid))
3231                         r = TAILQ_NEXT(r, entries);
3232                 /* tcp/udp only. gid.op always 0 in other cases */
3233                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3234                     pf_socket_lookup(direction, pd, m), 1)) &&
3235                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3236                     pd->lookup.gid))
3237                         r = TAILQ_NEXT(r, entries);
3238                 else if (r->prob &&
3239                     r->prob <= arc4random())
3240                         r = TAILQ_NEXT(r, entries);
3241                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3242                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3243                         r = TAILQ_NEXT(r, entries);
3244                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3245                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3246                     pf_osfp_fingerprint(pd, m, off, th),
3247                     r->os_fingerprint)))
3248                         r = TAILQ_NEXT(r, entries);
3249                 else {
3250                         if (r->tag)
3251                                 tag = r->tag;
3252                         if (r->rtableid >= 0)
3253                                 rtableid = r->rtableid;
3254                         if (r->anchor == NULL) {
3255                                 match = 1;
3256                                 *rm = r;
3257                                 *am = a;
3258                                 *rsm = ruleset;
3259                                 if ((*rm)->quick)
3260                                         break;
3261                                 r = TAILQ_NEXT(r, entries);
3262                         } else
3263                                 pf_step_into_anchor(anchor_stack, &asd,
3264                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3265                                     &match);
3266                 }
3267                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3268                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3269                         break;
3270         }
3271         r = *rm;
3272         a = *am;
3273         ruleset = *rsm;
3274
3275         REASON_SET(&reason, PFRES_MATCH);
3276
3277         if (r->log || (nr != NULL && nr->log)) {
3278                 if (rewrite)
3279                         m_copyback(m, off, hdrlen, pd->hdr.any);
3280                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3281                     ruleset, pd, 1);
3282         }
3283
3284         if ((r->action == PF_DROP) &&
3285             ((r->rule_flag & PFRULE_RETURNRST) ||
3286             (r->rule_flag & PFRULE_RETURNICMP) ||
3287             (r->rule_flag & PFRULE_RETURN))) {
3288                 /* undo NAT changes, if they have taken place */
3289                 if (nr != NULL) {
3290                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3291                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3292                         if (pd->sport)
3293                                 *pd->sport = sk->port[pd->sidx];
3294                         if (pd->dport)
3295                                 *pd->dport = sk->port[pd->didx];
3296                         if (pd->proto_sum)
3297                                 *pd->proto_sum = bproto_sum;
3298                         if (pd->ip_sum)
3299                                 *pd->ip_sum = bip_sum;
3300                         m_copyback(m, off, hdrlen, pd->hdr.any);
3301                 }
3302                 if (pd->proto == IPPROTO_TCP &&
3303                     ((r->rule_flag & PFRULE_RETURNRST) ||
3304                     (r->rule_flag & PFRULE_RETURN)) &&
3305                     !(th->th_flags & TH_RST)) {
3306                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3307                         int              len = 0;
3308 #ifdef INET
3309                         struct ip       *h4;
3310 #endif
3311 #ifdef INET6
3312                         struct ip6_hdr  *h6;
3313 #endif
3314
3315                         switch (af) {
3316 #ifdef INET
3317                         case AF_INET:
3318                                 h4 = mtod(m, struct ip *);
3319                                 len = ntohs(h4->ip_len) - off;
3320                                 break;
3321 #endif
3322 #ifdef INET6
3323                         case AF_INET6:
3324                                 h6 = mtod(m, struct ip6_hdr *);
3325                                 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3326                                 break;
3327 #endif
3328                         }
3329
3330                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3331                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3332                         else {
3333                                 if (th->th_flags & TH_SYN)
3334                                         ack++;
3335                                 if (th->th_flags & TH_FIN)
3336                                         ack++;
3337                                 pf_send_tcp(m, r, af, pd->dst,
3338                                     pd->src, th->th_dport, th->th_sport,
3339                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3340                                     r->return_ttl, 1, 0, kif->pfik_ifp);
3341                         }
3342                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3343                     r->return_icmp)
3344                         pf_send_icmp(m, r->return_icmp >> 8,
3345                             r->return_icmp & 255, af, r);
3346                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3347                     r->return_icmp6)
3348                         pf_send_icmp(m, r->return_icmp6 >> 8,
3349                             r->return_icmp6 & 255, af, r);
3350         }
3351
3352         if (r->action == PF_DROP)
3353                 goto cleanup;
3354
3355         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3356                 REASON_SET(&reason, PFRES_MEMORY);
3357                 goto cleanup;
3358         }
3359         if (rtableid >= 0)
3360                 M_SETFIB(m, rtableid);
3361
3362         if (!state_icmp && (r->keep_state || nr != NULL ||
3363             (pd->flags & PFDESC_TCP_NORM))) {
3364                 int action;
3365                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3366                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3367                     hdrlen);
3368                 if (action != PF_PASS)
3369                         return (action);
3370         } else {
3371                 if (sk != NULL)
3372                         uma_zfree(V_pf_state_key_z, sk);
3373                 if (nk != NULL)
3374                         uma_zfree(V_pf_state_key_z, nk);
3375         }
3376
3377         /* copy back packet headers if we performed NAT operations */
3378         if (rewrite)
3379                 m_copyback(m, off, hdrlen, pd->hdr.any);
3380
3381         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3382             direction == PF_OUT &&
3383             pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m))
3384                 /*
3385                  * We want the state created, but we dont
3386                  * want to send this in case a partner
3387                  * firewall has to know about it to allow
3388                  * replies through it.
3389                  */
3390                 return (PF_DEFER);
3391
3392         return (PF_PASS);
3393
3394 cleanup:
3395         if (sk != NULL)
3396                 uma_zfree(V_pf_state_key_z, sk);
3397         if (nk != NULL)
3398                 uma_zfree(V_pf_state_key_z, nk);
3399         return (PF_DROP);
3400 }
3401
3402 static int
3403 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3404     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3405     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3406     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3407     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3408 {
3409         struct pf_state         *s = NULL;
3410         struct pf_src_node      *sn = NULL;
3411         struct tcphdr           *th = pd->hdr.tcp;
3412         u_int16_t                mss = V_tcp_mssdflt;
3413         u_short                  reason;
3414
3415         /* check maximums */
3416         if (r->max_states && (r->states_cur >= r->max_states)) {
3417                 V_pf_status.lcounters[LCNT_STATES]++;
3418                 REASON_SET(&reason, PFRES_MAXSTATES);
3419                 return (PF_DROP);
3420         }
3421         /* src node for filter rule */
3422         if ((r->rule_flag & PFRULE_SRCTRACK ||
3423             r->rpool.opts & PF_POOL_STICKYADDR) &&
3424             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3425                 REASON_SET(&reason, PFRES_SRCLIMIT);
3426                 goto csfailed;
3427         }
3428         /* src node for translation rule */
3429         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3430             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3431                 REASON_SET(&reason, PFRES_SRCLIMIT);
3432                 goto csfailed;
3433         }
3434         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3435         if (s == NULL) {
3436                 REASON_SET(&reason, PFRES_MEMORY);
3437                 goto csfailed;
3438         }
3439         s->rule.ptr = r;
3440         s->nat_rule.ptr = nr;
3441         s->anchor.ptr = a;
3442         STATE_INC_COUNTERS(s);
3443         if (r->allow_opts)
3444                 s->state_flags |= PFSTATE_ALLOWOPTS;
3445         if (r->rule_flag & PFRULE_STATESLOPPY)
3446                 s->state_flags |= PFSTATE_SLOPPY;
3447         s->log = r->log & PF_LOG_ALL;
3448         s->sync_state = PFSYNC_S_NONE;
3449         if (nr != NULL)
3450                 s->log |= nr->log & PF_LOG_ALL;
3451         switch (pd->proto) {
3452         case IPPROTO_TCP:
3453                 s->src.seqlo = ntohl(th->th_seq);
3454                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3455                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3456                     r->keep_state == PF_STATE_MODULATE) {
3457                         /* Generate sequence number modulator */
3458                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3459                             0)
3460                                 s->src.seqdiff = 1;
3461                         pf_change_a(&th->th_seq, &th->th_sum,
3462                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3463                         *rewrite = 1;
3464                 } else
3465                         s->src.seqdiff = 0;
3466                 if (th->th_flags & TH_SYN) {
3467                         s->src.seqhi++;
3468                         s->src.wscale = pf_get_wscale(m, off,
3469                             th->th_off, pd->af);
3470                 }
3471                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3472                 if (s->src.wscale & PF_WSCALE_MASK) {
3473                         /* Remove scale factor from initial window */
3474                         int win = s->src.max_win;
3475                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3476                         s->src.max_win = (win - 1) >>
3477                             (s->src.wscale & PF_WSCALE_MASK);
3478                 }
3479                 if (th->th_flags & TH_FIN)
3480                         s->src.seqhi++;
3481                 s->dst.seqhi = 1;
3482                 s->dst.max_win = 1;
3483                 s->src.state = TCPS_SYN_SENT;
3484                 s->dst.state = TCPS_CLOSED;
3485                 s->timeout = PFTM_TCP_FIRST_PACKET;
3486                 break;
3487         case IPPROTO_UDP:
3488                 s->src.state = PFUDPS_SINGLE;
3489                 s->dst.state = PFUDPS_NO_TRAFFIC;
3490                 s->timeout = PFTM_UDP_FIRST_PACKET;
3491                 break;
3492         case IPPROTO_ICMP:
3493 #ifdef INET6
3494         case IPPROTO_ICMPV6:
3495 #endif
3496                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3497                 break;
3498         default:
3499                 s->src.state = PFOTHERS_SINGLE;
3500                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3501                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3502         }
3503
3504         s->creation = time_uptime;
3505         s->expire = time_uptime;
3506
3507         if (sn != NULL) {
3508                 s->src_node = sn;
3509                 s->src_node->states++;
3510         }
3511         if (nsn != NULL) {
3512                 /* XXX We only modify one side for now. */
3513                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3514                 s->nat_src_node = nsn;
3515                 s->nat_src_node->states++;
3516         }
3517         if (pd->proto == IPPROTO_TCP) {
3518                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3519                     off, pd, th, &s->src, &s->dst)) {
3520                         REASON_SET(&reason, PFRES_MEMORY);
3521                         pf_src_tree_remove_state(s);
3522                         STATE_DEC_COUNTERS(s);
3523                         uma_zfree(V_pf_state_z, s);
3524                         return (PF_DROP);
3525                 }
3526                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3527                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3528                     &s->src, &s->dst, rewrite)) {
3529                         /* This really shouldn't happen!!! */
3530                         DPFPRINTF(PF_DEBUG_URGENT,
3531                             ("pf_normalize_tcp_stateful failed on first pkt"));
3532                         pf_normalize_tcp_cleanup(s);
3533                         pf_src_tree_remove_state(s);
3534                         STATE_DEC_COUNTERS(s);
3535                         uma_zfree(V_pf_state_z, s);
3536                         return (PF_DROP);
3537                 }
3538         }
3539         s->direction = pd->dir;
3540
3541         /*
3542          * sk/nk could already been setup by pf_get_translation().
3543          */
3544         if (nr == NULL) {
3545                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3546                     __func__, nr, sk, nk));
3547                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3548                 if (sk == NULL)
3549                         goto csfailed;
3550                 nk = sk;
3551         } else
3552                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3553                     __func__, nr, sk, nk));
3554
3555         /* Swap sk/nk for PF_OUT. */
3556         if (pf_state_insert(BOUND_IFACE(r, kif),
3557             (pd->dir == PF_IN) ? sk : nk,
3558             (pd->dir == PF_IN) ? nk : sk, s)) {
3559                 if (pd->proto == IPPROTO_TCP)
3560                         pf_normalize_tcp_cleanup(s);
3561                 REASON_SET(&reason, PFRES_STATEINS);
3562                 pf_src_tree_remove_state(s);
3563                 STATE_DEC_COUNTERS(s);
3564                 uma_zfree(V_pf_state_z, s);
3565                 return (PF_DROP);
3566         } else
3567                 *sm = s;
3568
3569         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
3570         if (tag > 0)
3571                 s->tag = tag;
3572         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3573             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3574                 s->src.state = PF_TCPS_PROXY_SRC;
3575                 /* undo NAT changes, if they have taken place */
3576                 if (nr != NULL) {
3577                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3578                         if (pd->dir == PF_OUT)
3579                                 skt = s->key[PF_SK_STACK];
3580                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3581                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3582                         if (pd->sport)
3583                                 *pd->sport = skt->port[pd->sidx];
3584                         if (pd->dport)
3585                                 *pd->dport = skt->port[pd->didx];
3586                         if (pd->proto_sum)
3587                                 *pd->proto_sum = bproto_sum;
3588                         if (pd->ip_sum)
3589                                 *pd->ip_sum = bip_sum;
3590                         m_copyback(m, off, hdrlen, pd->hdr.any);
3591                 }
3592                 s->src.seqhi = htonl(arc4random());
3593                 /* Find mss option */
3594                 int rtid = M_GETFIB(m);
3595                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3596                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3597                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3598                 s->src.mss = mss;
3599                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3600                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3601                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3602                 REASON_SET(&reason, PFRES_SYNPROXY);
3603                 return (PF_SYNPROXY_DROP);
3604         }
3605
3606         return (PF_PASS);
3607
3608 csfailed:
3609         if (sk != NULL)
3610                 uma_zfree(V_pf_state_key_z, sk);
3611         if (nk != NULL)
3612                 uma_zfree(V_pf_state_key_z, nk);
3613
3614         if (sn != NULL && sn->states == 0 && sn->expire == 0)
3615                 pf_remove_src_node(sn);
3616
3617         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0)
3618                 pf_remove_src_node(nsn);
3619
3620         return (PF_DROP);
3621 }
3622
3623 static int
3624 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3625     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3626     struct pf_ruleset **rsm)
3627 {
3628         struct pf_rule          *r, *a = NULL;
3629         struct pf_ruleset       *ruleset = NULL;
3630         sa_family_t              af = pd->af;
3631         u_short                  reason;
3632         int                      tag = -1;
3633         int                      asd = 0;
3634         int                      match = 0;
3635         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3636
3637         PF_RULES_RASSERT();
3638
3639         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3640         while (r != NULL) {
3641                 r->evaluations++;
3642                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3643                         r = r->skip[PF_SKIP_IFP].ptr;
3644                 else if (r->direction && r->direction != direction)
3645                         r = r->skip[PF_SKIP_DIR].ptr;
3646                 else if (r->af && r->af != af)
3647                         r = r->skip[PF_SKIP_AF].ptr;
3648                 else if (r->proto && r->proto != pd->proto)
3649                         r = r->skip[PF_SKIP_PROTO].ptr;
3650                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3651                     r->src.neg, kif, M_GETFIB(m)))
3652                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3653                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3654                     r->dst.neg, NULL, M_GETFIB(m)))
3655                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3656                 else if (r->tos && !(r->tos == pd->tos))
3657                         r = TAILQ_NEXT(r, entries);
3658                 else if (r->os_fingerprint != PF_OSFP_ANY)
3659                         r = TAILQ_NEXT(r, entries);
3660                 else if (pd->proto == IPPROTO_UDP &&
3661                     (r->src.port_op || r->dst.port_op))
3662                         r = TAILQ_NEXT(r, entries);
3663                 else if (pd->proto == IPPROTO_TCP &&
3664                     (r->src.port_op || r->dst.port_op || r->flagset))
3665                         r = TAILQ_NEXT(r, entries);
3666                 else if ((pd->proto == IPPROTO_ICMP ||
3667                     pd->proto == IPPROTO_ICMPV6) &&
3668                     (r->type || r->code))
3669                         r = TAILQ_NEXT(r, entries);
3670                 else if (r->prob && r->prob <=
3671                     (arc4random() % (UINT_MAX - 1) + 1))
3672                         r = TAILQ_NEXT(r, entries);
3673                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3674                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3675                         r = TAILQ_NEXT(r, entries);
3676                 else {
3677                         if (r->anchor == NULL) {
3678                                 match = 1;
3679                                 *rm = r;
3680                                 *am = a;
3681                                 *rsm = ruleset;
3682                                 if ((*rm)->quick)
3683                                         break;
3684                                 r = TAILQ_NEXT(r, entries);
3685                         } else
3686                                 pf_step_into_anchor(anchor_stack, &asd,
3687                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3688                                     &match);
3689                 }
3690                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3691                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3692                         break;
3693         }
3694         r = *rm;
3695         a = *am;
3696         ruleset = *rsm;
3697
3698         REASON_SET(&reason, PFRES_MATCH);
3699
3700         if (r->log)
3701                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3702                     1);
3703
3704         if (r->action != PF_PASS)
3705                 return (PF_DROP);
3706
3707         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3708                 REASON_SET(&reason, PFRES_MEMORY);
3709                 return (PF_DROP);
3710         }
3711
3712         return (PF_PASS);
3713 }
3714
3715 static int
3716 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3717         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3718         struct pf_pdesc *pd, u_short *reason, int *copyback)
3719 {
3720         struct tcphdr           *th = pd->hdr.tcp;
3721         u_int16_t                win = ntohs(th->th_win);
3722         u_int32_t                ack, end, seq, orig_seq;
3723         u_int8_t                 sws, dws;
3724         int                      ackskew;
3725
3726         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3727                 sws = src->wscale & PF_WSCALE_MASK;
3728                 dws = dst->wscale & PF_WSCALE_MASK;
3729         } else
3730                 sws = dws = 0;
3731
3732         /*
3733          * Sequence tracking algorithm from Guido van Rooij's paper:
3734          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3735          *      tcp_filtering.ps
3736          */
3737
3738         orig_seq = seq = ntohl(th->th_seq);
3739         if (src->seqlo == 0) {
3740                 /* First packet from this end. Set its state */
3741
3742                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3743                     src->scrub == NULL) {
3744                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3745                                 REASON_SET(reason, PFRES_MEMORY);
3746                                 return (PF_DROP);
3747                         }
3748                 }
3749
3750                 /* Deferred generation of sequence number modulator */
3751                 if (dst->seqdiff && !src->seqdiff) {
3752                         /* use random iss for the TCP server */
3753                         while ((src->seqdiff = arc4random() - seq) == 0)
3754                                 ;
3755                         ack = ntohl(th->th_ack) - dst->seqdiff;
3756                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3757                             src->seqdiff), 0);
3758                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3759                         *copyback = 1;
3760                 } else {
3761                         ack = ntohl(th->th_ack);
3762                 }
3763
3764                 end = seq + pd->p_len;
3765                 if (th->th_flags & TH_SYN) {
3766                         end++;
3767                         if (dst->wscale & PF_WSCALE_FLAG) {
3768                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3769                                     pd->af);
3770                                 if (src->wscale & PF_WSCALE_FLAG) {
3771                                         /* Remove scale factor from initial
3772                                          * window */
3773                                         sws = src->wscale & PF_WSCALE_MASK;
3774                                         win = ((u_int32_t)win + (1 << sws) - 1)
3775                                             >> sws;
3776                                         dws = dst->wscale & PF_WSCALE_MASK;
3777                                 } else {
3778                                         /* fixup other window */
3779                                         dst->max_win <<= dst->wscale &
3780                                             PF_WSCALE_MASK;
3781                                         /* in case of a retrans SYN|ACK */
3782                                         dst->wscale = 0;
3783                                 }
3784                         }
3785                 }
3786                 if (th->th_flags & TH_FIN)
3787                         end++;
3788
3789                 src->seqlo = seq;
3790                 if (src->state < TCPS_SYN_SENT)
3791                         src->state = TCPS_SYN_SENT;
3792
3793                 /*
3794                  * May need to slide the window (seqhi may have been set by
3795                  * the crappy stack check or if we picked up the connection
3796                  * after establishment)
3797                  */
3798                 if (src->seqhi == 1 ||
3799                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3800                         src->seqhi = end + MAX(1, dst->max_win << dws);
3801                 if (win > src->max_win)
3802                         src->max_win = win;
3803
3804         } else {
3805                 ack = ntohl(th->th_ack) - dst->seqdiff;
3806                 if (src->seqdiff) {
3807                         /* Modulate sequence numbers */
3808                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
3809                             src->seqdiff), 0);
3810                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
3811                         *copyback = 1;
3812                 }
3813                 end = seq + pd->p_len;
3814                 if (th->th_flags & TH_SYN)
3815                         end++;
3816                 if (th->th_flags & TH_FIN)
3817                         end++;
3818         }
3819
3820         if ((th->th_flags & TH_ACK) == 0) {
3821                 /* Let it pass through the ack skew check */
3822                 ack = dst->seqlo;
3823         } else if ((ack == 0 &&
3824             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3825             /* broken tcp stacks do not set ack */
3826             (dst->state < TCPS_SYN_SENT)) {
3827                 /*
3828                  * Many stacks (ours included) will set the ACK number in an
3829                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3830                  */
3831                 ack = dst->seqlo;
3832         }
3833
3834         if (seq == end) {
3835                 /* Ease sequencing restrictions on no data packets */
3836                 seq = src->seqlo;
3837                 end = seq;
3838         }
3839
3840         ackskew = dst->seqlo - ack;
3841
3842
3843         /*
3844          * Need to demodulate the sequence numbers in any TCP SACK options
3845          * (Selective ACK). We could optionally validate the SACK values
3846          * against the current ACK window, either forwards or backwards, but
3847          * I'm not confident that SACK has been implemented properly
3848          * everywhere. It wouldn't surprise me if several stacks accidently
3849          * SACK too far backwards of previously ACKed data. There really aren't
3850          * any security implications of bad SACKing unless the target stack
3851          * doesn't validate the option length correctly. Someone trying to
3852          * spoof into a TCP connection won't bother blindly sending SACK
3853          * options anyway.
3854          */
3855         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
3856                 if (pf_modulate_sack(m, off, pd, th, dst))
3857                         *copyback = 1;
3858         }
3859
3860
3861 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3862         if (SEQ_GEQ(src->seqhi, end) &&
3863             /* Last octet inside other's window space */
3864             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3865             /* Retrans: not more than one window back */
3866             (ackskew >= -MAXACKWINDOW) &&
3867             /* Acking not more than one reassembled fragment backwards */
3868             (ackskew <= (MAXACKWINDOW << sws)) &&
3869             /* Acking not more than one window forward */
3870             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
3871             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
3872             (pd->flags & PFDESC_IP_REAS) == 0)) {
3873             /* Require an exact/+1 sequence match on resets when possible */
3874
3875                 if (dst->scrub || src->scrub) {
3876                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
3877                             *state, src, dst, copyback))
3878                                 return (PF_DROP);
3879                 }
3880
3881                 /* update max window */
3882                 if (src->max_win < win)
3883                         src->max_win = win;
3884                 /* synchronize sequencing */
3885                 if (SEQ_GT(end, src->seqlo))
3886                         src->seqlo = end;
3887                 /* slide the window of what the other end can send */
3888                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3889                         dst->seqhi = ack + MAX((win << sws), 1);
3890
3891
3892                 /* update states */
3893                 if (th->th_flags & TH_SYN)
3894                         if (src->state < TCPS_SYN_SENT)
3895                                 src->state = TCPS_SYN_SENT;
3896                 if (th->th_flags & TH_FIN)
3897                         if (src->state < TCPS_CLOSING)
3898                                 src->state = TCPS_CLOSING;
3899                 if (th->th_flags & TH_ACK) {
3900                         if (dst->state == TCPS_SYN_SENT) {
3901                                 dst->state = TCPS_ESTABLISHED;
3902                                 if (src->state == TCPS_ESTABLISHED &&
3903                                     (*state)->src_node != NULL &&
3904                                     pf_src_connlimit(state)) {
3905                                         REASON_SET(reason, PFRES_SRCLIMIT);
3906                                         return (PF_DROP);
3907                                 }
3908                         } else if (dst->state == TCPS_CLOSING)
3909                                 dst->state = TCPS_FIN_WAIT_2;
3910                 }
3911                 if (th->th_flags & TH_RST)
3912                         src->state = dst->state = TCPS_TIME_WAIT;
3913
3914                 /* update expire time */
3915                 (*state)->expire = time_uptime;
3916                 if (src->state >= TCPS_FIN_WAIT_2 &&
3917                     dst->state >= TCPS_FIN_WAIT_2)
3918                         (*state)->timeout = PFTM_TCP_CLOSED;
3919                 else if (src->state >= TCPS_CLOSING &&
3920                     dst->state >= TCPS_CLOSING)
3921                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
3922                 else if (src->state < TCPS_ESTABLISHED ||
3923                     dst->state < TCPS_ESTABLISHED)
3924                         (*state)->timeout = PFTM_TCP_OPENING;
3925                 else if (src->state >= TCPS_CLOSING ||
3926                     dst->state >= TCPS_CLOSING)
3927                         (*state)->timeout = PFTM_TCP_CLOSING;
3928                 else
3929                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
3930
3931                 /* Fall through to PASS packet */
3932
3933         } else if ((dst->state < TCPS_SYN_SENT ||
3934                 dst->state >= TCPS_FIN_WAIT_2 ||
3935                 src->state >= TCPS_FIN_WAIT_2) &&
3936             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
3937             /* Within a window forward of the originating packet */
3938             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
3939             /* Within a window backward of the originating packet */
3940
3941                 /*
3942                  * This currently handles three situations:
3943                  *  1) Stupid stacks will shotgun SYNs before their peer
3944                  *     replies.
3945                  *  2) When PF catches an already established stream (the
3946                  *     firewall rebooted, the state table was flushed, routes
3947                  *     changed...)
3948                  *  3) Packets get funky immediately after the connection
3949                  *     closes (this should catch Solaris spurious ACK|FINs
3950                  *     that web servers like to spew after a close)
3951                  *
3952                  * This must be a little more careful than the above code
3953                  * since packet floods will also be caught here. We don't
3954                  * update the TTL here to mitigate the damage of a packet
3955                  * flood and so the same code can handle awkward establishment
3956                  * and a loosened connection close.
3957                  * In the establishment case, a correct peer response will
3958                  * validate the connection, go through the normal state code
3959                  * and keep updating the state TTL.
3960                  */
3961
3962                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
3963                         printf("pf: loose state match: ");
3964                         pf_print_state(*state);
3965                         pf_print_flags(th->th_flags);
3966                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
3967                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
3968                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
3969                             (unsigned long long)(*state)->packets[1],
3970                             pd->dir == PF_IN ? "in" : "out",
3971                             pd->dir == (*state)->direction ? "fwd" : "rev");
3972                 }
3973
3974                 if (dst->scrub || src->scrub) {
3975                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
3976                             *state, src, dst, copyback))
3977                                 return (PF_DROP);
3978                 }
3979
3980                 /* update max window */
3981                 if (src->max_win < win)
3982                         src->max_win = win;
3983                 /* synchronize sequencing */
3984                 if (SEQ_GT(end, src->seqlo))
3985                         src->seqlo = end;
3986                 /* slide the window of what the other end can send */
3987                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3988                         dst->seqhi = ack + MAX((win << sws), 1);
3989
3990                 /*
3991                  * Cannot set dst->seqhi here since this could be a shotgunned
3992                  * SYN and not an already established connection.
3993                  */
3994
3995                 if (th->th_flags & TH_FIN)
3996                         if (src->state < TCPS_CLOSING)
3997                                 src->state = TCPS_CLOSING;
3998                 if (th->th_flags & TH_RST)
3999                         src->state = dst->state = TCPS_TIME_WAIT;
4000
4001                 /* Fall through to PASS packet */
4002
4003         } else {
4004                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4005                     (*state)->src.state == TCPS_SYN_SENT) {
4006                         /* Send RST for state mismatches during handshake */
4007                         if (!(th->th_flags & TH_RST))
4008                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4009                                     pd->dst, pd->src, th->th_dport,
4010                                     th->th_sport, ntohl(th->th_ack), 0,
4011                                     TH_RST, 0, 0,
4012                                     (*state)->rule.ptr->return_ttl, 1, 0,
4013                                     kif->pfik_ifp);
4014                         src->seqlo = 0;
4015                         src->seqhi = 1;
4016                         src->max_win = 1;
4017                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4018                         printf("pf: BAD state: ");
4019                         pf_print_state(*state);
4020                         pf_print_flags(th->th_flags);
4021                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4022                             "pkts=%llu:%llu dir=%s,%s\n",
4023                             seq, orig_seq, ack, pd->p_len, ackskew,
4024                             (unsigned long long)(*state)->packets[0],
4025                             (unsigned long long)(*state)->packets[1],
4026                             pd->dir == PF_IN ? "in" : "out",
4027                             pd->dir == (*state)->direction ? "fwd" : "rev");
4028                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4029                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4030                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4031                             ' ': '2',
4032                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4033                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4034                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4035                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4036                 }
4037                 REASON_SET(reason, PFRES_BADSTATE);
4038                 return (PF_DROP);
4039         }
4040
4041         return (PF_PASS);
4042 }
4043
4044 static int
4045 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4046         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4047 {
4048         struct tcphdr           *th = pd->hdr.tcp;
4049
4050         if (th->th_flags & TH_SYN)
4051                 if (src->state < TCPS_SYN_SENT)
4052                         src->state = TCPS_SYN_SENT;
4053         if (th->th_flags & TH_FIN)
4054                 if (src->state < TCPS_CLOSING)
4055                         src->state = TCPS_CLOSING;
4056         if (th->th_flags & TH_ACK) {
4057                 if (dst->state == TCPS_SYN_SENT) {
4058                         dst->state = TCPS_ESTABLISHED;
4059                         if (src->state == TCPS_ESTABLISHED &&
4060                             (*state)->src_node != NULL &&
4061                             pf_src_connlimit(state)) {
4062                                 REASON_SET(reason, PFRES_SRCLIMIT);
4063                                 return (PF_DROP);
4064                         }
4065                 } else if (dst->state == TCPS_CLOSING) {
4066                         dst->state = TCPS_FIN_WAIT_2;
4067                 } else if (src->state == TCPS_SYN_SENT &&
4068                     dst->state < TCPS_SYN_SENT) {
4069                         /*
4070                          * Handle a special sloppy case where we only see one
4071                          * half of the connection. If there is a ACK after
4072                          * the initial SYN without ever seeing a packet from
4073                          * the destination, set the connection to established.
4074                          */
4075                         dst->state = src->state = TCPS_ESTABLISHED;
4076                         if ((*state)->src_node != NULL &&
4077                             pf_src_connlimit(state)) {
4078                                 REASON_SET(reason, PFRES_SRCLIMIT);
4079                                 return (PF_DROP);
4080                         }
4081                 } else if (src->state == TCPS_CLOSING &&
4082                     dst->state == TCPS_ESTABLISHED &&
4083                     dst->seqlo == 0) {
4084                         /*
4085                          * Handle the closing of half connections where we
4086                          * don't see the full bidirectional FIN/ACK+ACK
4087                          * handshake.
4088                          */
4089                         dst->state = TCPS_CLOSING;
4090                 }
4091         }
4092         if (th->th_flags & TH_RST)
4093                 src->state = dst->state = TCPS_TIME_WAIT;
4094
4095         /* update expire time */
4096         (*state)->expire = time_uptime;
4097         if (src->state >= TCPS_FIN_WAIT_2 &&
4098             dst->state >= TCPS_FIN_WAIT_2)
4099                 (*state)->timeout = PFTM_TCP_CLOSED;
4100         else if (src->state >= TCPS_CLOSING &&
4101             dst->state >= TCPS_CLOSING)
4102                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4103         else if (src->state < TCPS_ESTABLISHED ||
4104             dst->state < TCPS_ESTABLISHED)
4105                 (*state)->timeout = PFTM_TCP_OPENING;
4106         else if (src->state >= TCPS_CLOSING ||
4107             dst->state >= TCPS_CLOSING)
4108                 (*state)->timeout = PFTM_TCP_CLOSING;
4109         else
4110                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4111
4112         return (PF_PASS);
4113 }
4114
4115 static int
4116 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4117     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4118     u_short *reason)
4119 {
4120         struct pf_state_key_cmp  key;
4121         struct tcphdr           *th = pd->hdr.tcp;
4122         int                      copyback = 0;
4123         struct pf_state_peer    *src, *dst;
4124         struct pf_state_key     *sk;
4125
4126         bzero(&key, sizeof(key));
4127         key.af = pd->af;
4128         key.proto = IPPROTO_TCP;
4129         if (direction == PF_IN) {       /* wire side, straight */
4130                 PF_ACPY(&key.addr[0], pd->src, key.af);
4131                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4132                 key.port[0] = th->th_sport;
4133                 key.port[1] = th->th_dport;
4134         } else {                        /* stack side, reverse */
4135                 PF_ACPY(&key.addr[1], pd->src, key.af);
4136                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4137                 key.port[1] = th->th_sport;
4138                 key.port[0] = th->th_dport;
4139         }
4140
4141         STATE_LOOKUP(kif, &key, direction, *state, pd);
4142
4143         if (direction == (*state)->direction) {
4144                 src = &(*state)->src;
4145                 dst = &(*state)->dst;
4146         } else {
4147                 src = &(*state)->dst;
4148                 dst = &(*state)->src;
4149         }
4150
4151         sk = (*state)->key[pd->didx];
4152
4153         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4154                 if (direction != (*state)->direction) {
4155                         REASON_SET(reason, PFRES_SYNPROXY);
4156                         return (PF_SYNPROXY_DROP);
4157                 }
4158                 if (th->th_flags & TH_SYN) {
4159                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4160                                 REASON_SET(reason, PFRES_SYNPROXY);
4161                                 return (PF_DROP);
4162                         }
4163                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4164                             pd->src, th->th_dport, th->th_sport,
4165                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4166                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4167                         REASON_SET(reason, PFRES_SYNPROXY);
4168                         return (PF_SYNPROXY_DROP);
4169                 } else if (!(th->th_flags & TH_ACK) ||
4170                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4171                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4172                         REASON_SET(reason, PFRES_SYNPROXY);
4173                         return (PF_DROP);
4174                 } else if ((*state)->src_node != NULL &&
4175                     pf_src_connlimit(state)) {
4176                         REASON_SET(reason, PFRES_SRCLIMIT);
4177                         return (PF_DROP);
4178                 } else
4179                         (*state)->src.state = PF_TCPS_PROXY_DST;
4180         }
4181         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4182                 if (direction == (*state)->direction) {
4183                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4184                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4185                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4186                                 REASON_SET(reason, PFRES_SYNPROXY);
4187                                 return (PF_DROP);
4188                         }
4189                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4190                         if ((*state)->dst.seqhi == 1)
4191                                 (*state)->dst.seqhi = htonl(arc4random());
4192                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4193                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4194                             sk->port[pd->sidx], sk->port[pd->didx],
4195                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4196                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4197                         REASON_SET(reason, PFRES_SYNPROXY);
4198                         return (PF_SYNPROXY_DROP);
4199                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4200                     (TH_SYN|TH_ACK)) ||
4201                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4202                         REASON_SET(reason, PFRES_SYNPROXY);
4203                         return (PF_DROP);
4204                 } else {
4205                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4206                         (*state)->dst.seqlo = ntohl(th->th_seq);
4207                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4208                             pd->src, th->th_dport, th->th_sport,
4209                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4210                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4211                             (*state)->tag, NULL);
4212                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4213                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4214                             sk->port[pd->sidx], sk->port[pd->didx],
4215                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4216                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4217                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4218                             (*state)->src.seqlo;
4219                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4220                             (*state)->dst.seqlo;
4221                         (*state)->src.seqhi = (*state)->src.seqlo +
4222                             (*state)->dst.max_win;
4223                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4224                             (*state)->src.max_win;
4225                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4226                         (*state)->src.state = (*state)->dst.state =
4227                             TCPS_ESTABLISHED;
4228                         REASON_SET(reason, PFRES_SYNPROXY);
4229                         return (PF_SYNPROXY_DROP);
4230                 }
4231         }
4232
4233         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4234             dst->state >= TCPS_FIN_WAIT_2 &&
4235             src->state >= TCPS_FIN_WAIT_2) {
4236                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4237                         printf("pf: state reuse ");
4238                         pf_print_state(*state);
4239                         pf_print_flags(th->th_flags);
4240                         printf("\n");
4241                 }
4242                 /* XXX make sure it's the same direction ?? */
4243                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4244                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4245                 *state = NULL;
4246                 return (PF_DROP);
4247         }
4248
4249         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4250                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4251                         return (PF_DROP);
4252         } else {
4253                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4254                     &copyback) == PF_DROP)
4255                         return (PF_DROP);
4256         }
4257
4258         /* translate source/destination address, if necessary */
4259         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4260                 struct pf_state_key *nk = (*state)->key[pd->didx];
4261
4262                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4263                     nk->port[pd->sidx] != th->th_sport)
4264                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
4265                             &th->th_sum, &nk->addr[pd->sidx],
4266                             nk->port[pd->sidx], 0, pd->af);
4267
4268                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4269                     nk->port[pd->didx] != th->th_dport)
4270                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
4271                             &th->th_sum, &nk->addr[pd->didx],
4272                             nk->port[pd->didx], 0, pd->af);
4273                 copyback = 1;
4274         }
4275
4276         /* Copyback sequence modulation or stateful scrub changes if needed */
4277         if (copyback)
4278                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4279
4280         return (PF_PASS);
4281 }
4282
4283 static int
4284 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4285     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4286 {
4287         struct pf_state_peer    *src, *dst;
4288         struct pf_state_key_cmp  key;
4289         struct udphdr           *uh = pd->hdr.udp;
4290
4291         bzero(&key, sizeof(key));
4292         key.af = pd->af;
4293         key.proto = IPPROTO_UDP;
4294         if (direction == PF_IN) {       /* wire side, straight */
4295                 PF_ACPY(&key.addr[0], pd->src, key.af);
4296                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4297                 key.port[0] = uh->uh_sport;
4298                 key.port[1] = uh->uh_dport;
4299         } else {                        /* stack side, reverse */
4300                 PF_ACPY(&key.addr[1], pd->src, key.af);
4301                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4302                 key.port[1] = uh->uh_sport;
4303                 key.port[0] = uh->uh_dport;
4304         }
4305
4306         STATE_LOOKUP(kif, &key, direction, *state, pd);
4307
4308         if (direction == (*state)->direction) {
4309                 src = &(*state)->src;
4310                 dst = &(*state)->dst;
4311         } else {
4312                 src = &(*state)->dst;
4313                 dst = &(*state)->src;
4314         }
4315
4316         /* update states */
4317         if (src->state < PFUDPS_SINGLE)
4318                 src->state = PFUDPS_SINGLE;
4319         if (dst->state == PFUDPS_SINGLE)
4320                 dst->state = PFUDPS_MULTIPLE;
4321
4322         /* update expire time */
4323         (*state)->expire = time_uptime;
4324         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4325                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4326         else
4327                 (*state)->timeout = PFTM_UDP_SINGLE;
4328
4329         /* translate source/destination address, if necessary */
4330         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4331                 struct pf_state_key *nk = (*state)->key[pd->didx];
4332
4333                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4334                     nk->port[pd->sidx] != uh->uh_sport)
4335                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
4336                             &uh->uh_sum, &nk->addr[pd->sidx],
4337                             nk->port[pd->sidx], 1, pd->af);
4338
4339                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4340                     nk->port[pd->didx] != uh->uh_dport)
4341                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
4342                             &uh->uh_sum, &nk->addr[pd->didx],
4343                             nk->port[pd->didx], 1, pd->af);
4344                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4345         }
4346
4347         return (PF_PASS);
4348 }
4349
4350 static int
4351 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4352     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4353 {
4354         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4355         u_int16_t        icmpid = 0, *icmpsum;
4356         u_int8_t         icmptype;
4357         int              state_icmp = 0;
4358         struct pf_state_key_cmp key;
4359
4360         bzero(&key, sizeof(key));
4361         switch (pd->proto) {
4362 #ifdef INET
4363         case IPPROTO_ICMP:
4364                 icmptype = pd->hdr.icmp->icmp_type;
4365                 icmpid = pd->hdr.icmp->icmp_id;
4366                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4367
4368                 if (icmptype == ICMP_UNREACH ||
4369                     icmptype == ICMP_SOURCEQUENCH ||
4370                     icmptype == ICMP_REDIRECT ||
4371                     icmptype == ICMP_TIMXCEED ||
4372                     icmptype == ICMP_PARAMPROB)
4373                         state_icmp++;
4374                 break;
4375 #endif /* INET */
4376 #ifdef INET6
4377         case IPPROTO_ICMPV6:
4378                 icmptype = pd->hdr.icmp6->icmp6_type;
4379                 icmpid = pd->hdr.icmp6->icmp6_id;
4380                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4381
4382                 if (icmptype == ICMP6_DST_UNREACH ||
4383                     icmptype == ICMP6_PACKET_TOO_BIG ||
4384                     icmptype == ICMP6_TIME_EXCEEDED ||
4385                     icmptype == ICMP6_PARAM_PROB)
4386                         state_icmp++;
4387                 break;
4388 #endif /* INET6 */
4389         }
4390
4391         if (!state_icmp) {
4392
4393                 /*
4394                  * ICMP query/reply message not related to a TCP/UDP packet.
4395                  * Search for an ICMP state.
4396                  */
4397                 key.af = pd->af;
4398                 key.proto = pd->proto;
4399                 key.port[0] = key.port[1] = icmpid;
4400                 if (direction == PF_IN) {       /* wire side, straight */
4401                         PF_ACPY(&key.addr[0], pd->src, key.af);
4402                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4403                 } else {                        /* stack side, reverse */
4404                         PF_ACPY(&key.addr[1], pd->src, key.af);
4405                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4406                 }
4407
4408                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4409
4410                 (*state)->expire = time_uptime;
4411                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4412
4413                 /* translate source/destination address, if necessary */
4414                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4415                         struct pf_state_key *nk = (*state)->key[pd->didx];
4416
4417                         switch (pd->af) {
4418 #ifdef INET
4419                         case AF_INET:
4420                                 if (PF_ANEQ(pd->src,
4421                                     &nk->addr[pd->sidx], AF_INET))
4422                                         pf_change_a(&saddr->v4.s_addr,
4423                                             pd->ip_sum,
4424                                             nk->addr[pd->sidx].v4.s_addr, 0);
4425
4426                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4427                                     AF_INET))
4428                                         pf_change_a(&daddr->v4.s_addr,
4429                                             pd->ip_sum,
4430                                             nk->addr[pd->didx].v4.s_addr, 0);
4431
4432                                 if (nk->port[0] !=
4433                                     pd->hdr.icmp->icmp_id) {
4434                                         pd->hdr.icmp->icmp_cksum =
4435                                             pf_cksum_fixup(
4436                                             pd->hdr.icmp->icmp_cksum, icmpid,
4437                                             nk->port[pd->sidx], 0);
4438                                         pd->hdr.icmp->icmp_id =
4439                                             nk->port[pd->sidx];
4440                                 }
4441
4442                                 m_copyback(m, off, ICMP_MINLEN,
4443                                     (caddr_t )pd->hdr.icmp);
4444                                 break;
4445 #endif /* INET */
4446 #ifdef INET6
4447                         case AF_INET6:
4448                                 if (PF_ANEQ(pd->src,
4449                                     &nk->addr[pd->sidx], AF_INET6))
4450                                         pf_change_a6(saddr,
4451                                             &pd->hdr.icmp6->icmp6_cksum,
4452                                             &nk->addr[pd->sidx], 0);
4453
4454                                 if (PF_ANEQ(pd->dst,
4455                                     &nk->addr[pd->didx], AF_INET6))
4456                                         pf_change_a6(daddr,
4457                                             &pd->hdr.icmp6->icmp6_cksum,
4458                                             &nk->addr[pd->didx], 0);
4459
4460                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4461                                     (caddr_t )pd->hdr.icmp6);
4462                                 break;
4463 #endif /* INET6 */
4464                         }
4465                 }
4466                 return (PF_PASS);
4467
4468         } else {
4469                 /*
4470                  * ICMP error message in response to a TCP/UDP packet.
4471                  * Extract the inner TCP/UDP header and search for that state.
4472                  */
4473
4474                 struct pf_pdesc pd2;
4475                 bzero(&pd2, sizeof pd2);
4476 #ifdef INET
4477                 struct ip       h2;
4478 #endif /* INET */
4479 #ifdef INET6
4480                 struct ip6_hdr  h2_6;
4481                 int             terminal = 0;
4482 #endif /* INET6 */
4483                 int             ipoff2 = 0;
4484                 int             off2 = 0;
4485
4486                 pd2.af = pd->af;
4487                 /* Payload packet is from the opposite direction. */
4488                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4489                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4490                 switch (pd->af) {
4491 #ifdef INET
4492                 case AF_INET:
4493                         /* offset of h2 in mbuf chain */
4494                         ipoff2 = off + ICMP_MINLEN;
4495
4496                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4497                             NULL, reason, pd2.af)) {
4498                                 DPFPRINTF(PF_DEBUG_MISC,
4499                                     ("pf: ICMP error message too short "
4500                                     "(ip)\n"));
4501                                 return (PF_DROP);
4502                         }
4503                         /*
4504                          * ICMP error messages don't refer to non-first
4505                          * fragments
4506                          */
4507                         if (h2.ip_off & htons(IP_OFFMASK)) {
4508                                 REASON_SET(reason, PFRES_FRAG);
4509                                 return (PF_DROP);
4510                         }
4511
4512                         /* offset of protocol header that follows h2 */
4513                         off2 = ipoff2 + (h2.ip_hl << 2);
4514
4515                         pd2.proto = h2.ip_p;
4516                         pd2.src = (struct pf_addr *)&h2.ip_src;
4517                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4518                         pd2.ip_sum = &h2.ip_sum;
4519                         break;
4520 #endif /* INET */
4521 #ifdef INET6
4522                 case AF_INET6:
4523                         ipoff2 = off + sizeof(struct icmp6_hdr);
4524
4525                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4526                             NULL, reason, pd2.af)) {
4527                                 DPFPRINTF(PF_DEBUG_MISC,
4528                                     ("pf: ICMP error message too short "
4529                                     "(ip6)\n"));
4530                                 return (PF_DROP);
4531                         }
4532                         pd2.proto = h2_6.ip6_nxt;
4533                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4534                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4535                         pd2.ip_sum = NULL;
4536                         off2 = ipoff2 + sizeof(h2_6);
4537                         do {
4538                                 switch (pd2.proto) {
4539                                 case IPPROTO_FRAGMENT:
4540                                         /*
4541                                          * ICMPv6 error messages for
4542                                          * non-first fragments
4543                                          */
4544                                         REASON_SET(reason, PFRES_FRAG);
4545                                         return (PF_DROP);
4546                                 case IPPROTO_AH:
4547                                 case IPPROTO_HOPOPTS:
4548                                 case IPPROTO_ROUTING:
4549                                 case IPPROTO_DSTOPTS: {
4550                                         /* get next header and header length */
4551                                         struct ip6_ext opt6;
4552
4553                                         if (!pf_pull_hdr(m, off2, &opt6,
4554                                             sizeof(opt6), NULL, reason,
4555                                             pd2.af)) {
4556                                                 DPFPRINTF(PF_DEBUG_MISC,
4557                                                     ("pf: ICMPv6 short opt\n"));
4558                                                 return (PF_DROP);
4559                                         }
4560                                         if (pd2.proto == IPPROTO_AH)
4561                                                 off2 += (opt6.ip6e_len + 2) * 4;
4562                                         else
4563                                                 off2 += (opt6.ip6e_len + 1) * 8;
4564                                         pd2.proto = opt6.ip6e_nxt;
4565                                         /* goto the next header */
4566                                         break;
4567                                 }
4568                                 default:
4569                                         terminal++;
4570                                         break;
4571                                 }
4572                         } while (!terminal);
4573                         break;
4574 #endif /* INET6 */
4575                 }
4576
4577                 switch (pd2.proto) {
4578                 case IPPROTO_TCP: {
4579                         struct tcphdr            th;
4580                         u_int32_t                seq;
4581                         struct pf_state_peer    *src, *dst;
4582                         u_int8_t                 dws;
4583                         int                      copyback = 0;
4584
4585                         /*
4586                          * Only the first 8 bytes of the TCP header can be
4587                          * expected. Don't access any TCP header fields after
4588                          * th_seq, an ackskew test is not possible.
4589                          */
4590                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4591                             pd2.af)) {
4592                                 DPFPRINTF(PF_DEBUG_MISC,
4593                                     ("pf: ICMP error message too short "
4594                                     "(tcp)\n"));
4595                                 return (PF_DROP);
4596                         }
4597
4598                         key.af = pd2.af;
4599                         key.proto = IPPROTO_TCP;
4600                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4601                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4602                         key.port[pd2.sidx] = th.th_sport;
4603                         key.port[pd2.didx] = th.th_dport;
4604
4605                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4606
4607                         if (direction == (*state)->direction) {
4608                                 src = &(*state)->dst;
4609                                 dst = &(*state)->src;
4610                         } else {
4611                                 src = &(*state)->src;
4612                                 dst = &(*state)->dst;
4613                         }
4614
4615                         if (src->wscale && dst->wscale)
4616                                 dws = dst->wscale & PF_WSCALE_MASK;
4617                         else
4618                                 dws = 0;
4619
4620                         /* Demodulate sequence number */
4621                         seq = ntohl(th.th_seq) - src->seqdiff;
4622                         if (src->seqdiff) {
4623                                 pf_change_a(&th.th_seq, icmpsum,
4624                                     htonl(seq), 0);
4625                                 copyback = 1;
4626                         }
4627
4628                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4629                             (!SEQ_GEQ(src->seqhi, seq) ||
4630                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4631                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4632                                         printf("pf: BAD ICMP %d:%d ",
4633                                             icmptype, pd->hdr.icmp->icmp_code);
4634                                         pf_print_host(pd->src, 0, pd->af);
4635                                         printf(" -> ");
4636                                         pf_print_host(pd->dst, 0, pd->af);
4637                                         printf(" state: ");
4638                                         pf_print_state(*state);
4639                                         printf(" seq=%u\n", seq);
4640                                 }
4641                                 REASON_SET(reason, PFRES_BADSTATE);
4642                                 return (PF_DROP);
4643                         } else {
4644                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4645                                         printf("pf: OK ICMP %d:%d ",
4646                                             icmptype, pd->hdr.icmp->icmp_code);
4647                                         pf_print_host(pd->src, 0, pd->af);
4648                                         printf(" -> ");
4649                                         pf_print_host(pd->dst, 0, pd->af);
4650                                         printf(" state: ");
4651                                         pf_print_state(*state);
4652                                         printf(" seq=%u\n", seq);
4653                                 }
4654                         }
4655
4656                         /* translate source/destination address, if necessary */
4657                         if ((*state)->key[PF_SK_WIRE] !=
4658                             (*state)->key[PF_SK_STACK]) {
4659                                 struct pf_state_key *nk =
4660                                     (*state)->key[pd->didx];
4661
4662                                 if (PF_ANEQ(pd2.src,
4663                                     &nk->addr[pd2.sidx], pd2.af) ||
4664                                     nk->port[pd2.sidx] != th.th_sport)
4665                                         pf_change_icmp(pd2.src, &th.th_sport,
4666                                             daddr, &nk->addr[pd2.sidx],
4667                                             nk->port[pd2.sidx], NULL,
4668                                             pd2.ip_sum, icmpsum,
4669                                             pd->ip_sum, 0, pd2.af);
4670
4671                                 if (PF_ANEQ(pd2.dst,
4672                                     &nk->addr[pd2.didx], pd2.af) ||
4673                                     nk->port[pd2.didx] != th.th_dport)
4674                                         pf_change_icmp(pd2.dst, &th.th_dport,
4675                                             NULL, /* XXX Inbound NAT? */
4676                                             &nk->addr[pd2.didx],
4677                                             nk->port[pd2.didx], NULL,
4678                                             pd2.ip_sum, icmpsum,
4679                                             pd->ip_sum, 0, pd2.af);
4680                                 copyback = 1;
4681                         }
4682
4683                         if (copyback) {
4684                                 switch (pd2.af) {
4685 #ifdef INET
4686                                 case AF_INET:
4687                                         m_copyback(m, off, ICMP_MINLEN,
4688                                             (caddr_t )pd->hdr.icmp);
4689                                         m_copyback(m, ipoff2, sizeof(h2),
4690                                             (caddr_t )&h2);
4691                                         break;
4692 #endif /* INET */
4693 #ifdef INET6
4694                                 case AF_INET6:
4695                                         m_copyback(m, off,
4696                                             sizeof(struct icmp6_hdr),
4697                                             (caddr_t )pd->hdr.icmp6);
4698                                         m_copyback(m, ipoff2, sizeof(h2_6),
4699                                             (caddr_t )&h2_6);
4700                                         break;
4701 #endif /* INET6 */
4702                                 }
4703                                 m_copyback(m, off2, 8, (caddr_t)&th);
4704                         }
4705
4706                         return (PF_PASS);
4707                         break;
4708                 }
4709                 case IPPROTO_UDP: {
4710                         struct udphdr           uh;
4711
4712                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4713                             NULL, reason, pd2.af)) {
4714                                 DPFPRINTF(PF_DEBUG_MISC,
4715                                     ("pf: ICMP error message too short "
4716                                     "(udp)\n"));
4717                                 return (PF_DROP);
4718                         }
4719
4720                         key.af = pd2.af;
4721                         key.proto = IPPROTO_UDP;
4722                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4723                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4724                         key.port[pd2.sidx] = uh.uh_sport;
4725                         key.port[pd2.didx] = uh.uh_dport;
4726
4727                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4728
4729                         /* translate source/destination address, if necessary */
4730                         if ((*state)->key[PF_SK_WIRE] !=
4731                             (*state)->key[PF_SK_STACK]) {
4732                                 struct pf_state_key *nk =
4733                                     (*state)->key[pd->didx];
4734
4735                                 if (PF_ANEQ(pd2.src,
4736                                     &nk->addr[pd2.sidx], pd2.af) ||
4737                                     nk->port[pd2.sidx] != uh.uh_sport)
4738                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4739                                             daddr, &nk->addr[pd2.sidx],
4740                                             nk->port[pd2.sidx], &uh.uh_sum,
4741                                             pd2.ip_sum, icmpsum,
4742                                             pd->ip_sum, 1, pd2.af);
4743
4744                                 if (PF_ANEQ(pd2.dst,
4745                                     &nk->addr[pd2.didx], pd2.af) ||
4746                                     nk->port[pd2.didx] != uh.uh_dport)
4747                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4748                                             NULL, /* XXX Inbound NAT? */
4749                                             &nk->addr[pd2.didx],
4750                                             nk->port[pd2.didx], &uh.uh_sum,
4751                                             pd2.ip_sum, icmpsum,
4752                                             pd->ip_sum, 1, pd2.af);
4753
4754                                 switch (pd2.af) {
4755 #ifdef INET
4756                                 case AF_INET:
4757                                         m_copyback(m, off, ICMP_MINLEN,
4758                                             (caddr_t )pd->hdr.icmp);
4759                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4760                                         break;
4761 #endif /* INET */
4762 #ifdef INET6
4763                                 case AF_INET6:
4764                                         m_copyback(m, off,
4765                                             sizeof(struct icmp6_hdr),
4766                                             (caddr_t )pd->hdr.icmp6);
4767                                         m_copyback(m, ipoff2, sizeof(h2_6),
4768                                             (caddr_t )&h2_6);
4769                                         break;
4770 #endif /* INET6 */
4771                                 }
4772                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4773                         }
4774                         return (PF_PASS);
4775                         break;
4776                 }
4777 #ifdef INET
4778                 case IPPROTO_ICMP: {
4779                         struct icmp             iih;
4780
4781                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4782                             NULL, reason, pd2.af)) {
4783                                 DPFPRINTF(PF_DEBUG_MISC,
4784                                     ("pf: ICMP error message too short i"
4785                                     "(icmp)\n"));
4786                                 return (PF_DROP);
4787                         }
4788
4789                         key.af = pd2.af;
4790                         key.proto = IPPROTO_ICMP;
4791                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4792                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4793                         key.port[0] = key.port[1] = iih.icmp_id;
4794
4795                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4796
4797                         /* translate source/destination address, if necessary */
4798                         if ((*state)->key[PF_SK_WIRE] !=
4799                             (*state)->key[PF_SK_STACK]) {
4800                                 struct pf_state_key *nk =
4801                                     (*state)->key[pd->didx];
4802
4803                                 if (PF_ANEQ(pd2.src,
4804                                     &nk->addr[pd2.sidx], pd2.af) ||
4805                                     nk->port[pd2.sidx] != iih.icmp_id)
4806                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4807                                             daddr, &nk->addr[pd2.sidx],
4808                                             nk->port[pd2.sidx], NULL,
4809                                             pd2.ip_sum, icmpsum,
4810                                             pd->ip_sum, 0, AF_INET);
4811
4812                                 if (PF_ANEQ(pd2.dst,
4813                                     &nk->addr[pd2.didx], pd2.af) ||
4814                                     nk->port[pd2.didx] != iih.icmp_id)
4815                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4816                                             NULL, /* XXX Inbound NAT? */
4817                                             &nk->addr[pd2.didx],
4818                                             nk->port[pd2.didx], NULL,
4819                                             pd2.ip_sum, icmpsum,
4820                                             pd->ip_sum, 0, AF_INET);
4821
4822                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4823                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4824                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4825                         }
4826                         return (PF_PASS);
4827                         break;
4828                 }
4829 #endif /* INET */
4830 #ifdef INET6
4831                 case IPPROTO_ICMPV6: {
4832                         struct icmp6_hdr        iih;
4833
4834                         if (!pf_pull_hdr(m, off2, &iih,
4835                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
4836                                 DPFPRINTF(PF_DEBUG_MISC,
4837                                     ("pf: ICMP error message too short "
4838                                     "(icmp6)\n"));
4839                                 return (PF_DROP);
4840                         }
4841
4842                         key.af = pd2.af;
4843                         key.proto = IPPROTO_ICMPV6;
4844                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4845                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4846                         key.port[0] = key.port[1] = iih.icmp6_id;
4847
4848                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4849
4850                         /* translate source/destination address, if necessary */
4851                         if ((*state)->key[PF_SK_WIRE] !=
4852                             (*state)->key[PF_SK_STACK]) {
4853                                 struct pf_state_key *nk =
4854                                     (*state)->key[pd->didx];
4855
4856                                 if (PF_ANEQ(pd2.src,
4857                                     &nk->addr[pd2.sidx], pd2.af) ||
4858                                     nk->port[pd2.sidx] != iih.icmp6_id)
4859                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4860                                             daddr, &nk->addr[pd2.sidx],
4861                                             nk->port[pd2.sidx], NULL,
4862                                             pd2.ip_sum, icmpsum,
4863                                             pd->ip_sum, 0, AF_INET6);
4864
4865                                 if (PF_ANEQ(pd2.dst,
4866                                     &nk->addr[pd2.didx], pd2.af) ||
4867                                     nk->port[pd2.didx] != iih.icmp6_id)
4868                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4869                                             NULL, /* XXX Inbound NAT? */
4870                                             &nk->addr[pd2.didx],
4871                                             nk->port[pd2.didx], NULL,
4872                                             pd2.ip_sum, icmpsum,
4873                                             pd->ip_sum, 0, AF_INET6);
4874
4875                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4876                                     (caddr_t)pd->hdr.icmp6);
4877                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4878                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4879                                     (caddr_t)&iih);
4880                         }
4881                         return (PF_PASS);
4882                         break;
4883                 }
4884 #endif /* INET6 */
4885                 default: {
4886                         key.af = pd2.af;
4887                         key.proto = pd2.proto;
4888                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4889                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4890                         key.port[0] = key.port[1] = 0;
4891
4892                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4893
4894                         /* translate source/destination address, if necessary */
4895                         if ((*state)->key[PF_SK_WIRE] !=
4896                             (*state)->key[PF_SK_STACK]) {
4897                                 struct pf_state_key *nk =
4898                                     (*state)->key[pd->didx];
4899
4900                                 if (PF_ANEQ(pd2.src,
4901                                     &nk->addr[pd2.sidx], pd2.af))
4902                                         pf_change_icmp(pd2.src, NULL, daddr,
4903                                             &nk->addr[pd2.sidx], 0, NULL,
4904                                             pd2.ip_sum, icmpsum,
4905                                             pd->ip_sum, 0, pd2.af);
4906
4907                                 if (PF_ANEQ(pd2.dst,
4908                                     &nk->addr[pd2.didx], pd2.af))
4909                                         pf_change_icmp(pd2.src, NULL,
4910                                             NULL, /* XXX Inbound NAT? */
4911                                             &nk->addr[pd2.didx], 0, NULL,
4912                                             pd2.ip_sum, icmpsum,
4913                                             pd->ip_sum, 0, pd2.af);
4914
4915                                 switch (pd2.af) {
4916 #ifdef INET
4917                                 case AF_INET:
4918                                         m_copyback(m, off, ICMP_MINLEN,
4919                                             (caddr_t)pd->hdr.icmp);
4920                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4921                                         break;
4922 #endif /* INET */
4923 #ifdef INET6
4924                                 case AF_INET6:
4925                                         m_copyback(m, off,
4926                                             sizeof(struct icmp6_hdr),
4927                                             (caddr_t )pd->hdr.icmp6);
4928                                         m_copyback(m, ipoff2, sizeof(h2_6),
4929                                             (caddr_t )&h2_6);
4930                                         break;
4931 #endif /* INET6 */
4932                                 }
4933                         }
4934                         return (PF_PASS);
4935                         break;
4936                 }
4937                 }
4938         }
4939 }
4940
4941 static int
4942 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
4943     struct mbuf *m, struct pf_pdesc *pd)
4944 {
4945         struct pf_state_peer    *src, *dst;
4946         struct pf_state_key_cmp  key;
4947
4948         bzero(&key, sizeof(key));
4949         key.af = pd->af;
4950         key.proto = pd->proto;
4951         if (direction == PF_IN) {
4952                 PF_ACPY(&key.addr[0], pd->src, key.af);
4953                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4954                 key.port[0] = key.port[1] = 0;
4955         } else {
4956                 PF_ACPY(&key.addr[1], pd->src, key.af);
4957                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4958                 key.port[1] = key.port[0] = 0;
4959         }
4960
4961         STATE_LOOKUP(kif, &key, direction, *state, pd);
4962
4963         if (direction == (*state)->direction) {
4964                 src = &(*state)->src;
4965                 dst = &(*state)->dst;
4966         } else {
4967                 src = &(*state)->dst;
4968                 dst = &(*state)->src;
4969         }
4970
4971         /* update states */
4972         if (src->state < PFOTHERS_SINGLE)
4973                 src->state = PFOTHERS_SINGLE;
4974         if (dst->state == PFOTHERS_SINGLE)
4975                 dst->state = PFOTHERS_MULTIPLE;
4976
4977         /* update expire time */
4978         (*state)->expire = time_uptime;
4979         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
4980                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
4981         else
4982                 (*state)->timeout = PFTM_OTHER_SINGLE;
4983
4984         /* translate source/destination address, if necessary */
4985         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4986                 struct pf_state_key *nk = (*state)->key[pd->didx];
4987
4988                 KASSERT(nk, ("%s: nk is null", __func__));
4989                 KASSERT(pd, ("%s: pd is null", __func__));
4990                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
4991                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
4992                 switch (pd->af) {
4993 #ifdef INET
4994                 case AF_INET:
4995                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
4996                                 pf_change_a(&pd->src->v4.s_addr,
4997                                     pd->ip_sum,
4998                                     nk->addr[pd->sidx].v4.s_addr,
4999                                     0);
5000
5001
5002                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5003                                 pf_change_a(&pd->dst->v4.s_addr,
5004                                     pd->ip_sum,
5005                                     nk->addr[pd->didx].v4.s_addr,
5006                                     0);
5007
5008                                 break;
5009 #endif /* INET */
5010 #ifdef INET6
5011                 case AF_INET6:
5012                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5013                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5014
5015                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5016                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5017 #endif /* INET6 */
5018                 }
5019         }
5020         return (PF_PASS);
5021 }
5022
5023 /*
5024  * ipoff and off are measured from the start of the mbuf chain.
5025  * h must be at "ipoff" on the mbuf chain.
5026  */
5027 void *
5028 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5029     u_short *actionp, u_short *reasonp, sa_family_t af)
5030 {
5031         switch (af) {
5032 #ifdef INET
5033         case AF_INET: {
5034                 struct ip       *h = mtod(m, struct ip *);
5035                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5036
5037                 if (fragoff) {
5038                         if (fragoff >= len)
5039                                 ACTION_SET(actionp, PF_PASS);
5040                         else {
5041                                 ACTION_SET(actionp, PF_DROP);
5042                                 REASON_SET(reasonp, PFRES_FRAG);
5043                         }
5044                         return (NULL);
5045                 }
5046                 if (m->m_pkthdr.len < off + len ||
5047                     ntohs(h->ip_len) < off + len) {
5048                         ACTION_SET(actionp, PF_DROP);
5049                         REASON_SET(reasonp, PFRES_SHORT);
5050                         return (NULL);
5051                 }
5052                 break;
5053         }
5054 #endif /* INET */
5055 #ifdef INET6
5056         case AF_INET6: {
5057                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5058
5059                 if (m->m_pkthdr.len < off + len ||
5060                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5061                     (unsigned)(off + len)) {
5062                         ACTION_SET(actionp, PF_DROP);
5063                         REASON_SET(reasonp, PFRES_SHORT);
5064                         return (NULL);
5065                 }
5066                 break;
5067         }
5068 #endif /* INET6 */
5069         }
5070         m_copydata(m, off, len, p);
5071         return (p);
5072 }
5073
5074 int
5075 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5076     int rtableid)
5077 {
5078 #ifdef RADIX_MPATH
5079         struct radix_node_head  *rnh;
5080 #endif
5081         struct sockaddr_in      *dst;
5082         int                      ret = 1;
5083         int                      check_mpath;
5084 #ifdef INET6
5085         struct sockaddr_in6     *dst6;
5086         struct route_in6         ro;
5087 #else
5088         struct route             ro;
5089 #endif
5090         struct radix_node       *rn;
5091         struct rtentry          *rt;
5092         struct ifnet            *ifp;
5093
5094         check_mpath = 0;
5095 #ifdef RADIX_MPATH
5096         /* XXX: stick to table 0 for now */
5097         rnh = rt_tables_get_rnh(0, af);
5098         if (rnh != NULL && rn_mpath_capable(rnh))
5099                 check_mpath = 1;
5100 #endif
5101         bzero(&ro, sizeof(ro));
5102         switch (af) {
5103         case AF_INET:
5104                 dst = satosin(&ro.ro_dst);
5105                 dst->sin_family = AF_INET;
5106                 dst->sin_len = sizeof(*dst);
5107                 dst->sin_addr = addr->v4;
5108                 break;
5109 #ifdef INET6
5110         case AF_INET6:
5111                 /*
5112                  * Skip check for addresses with embedded interface scope,
5113                  * as they would always match anyway.
5114                  */
5115                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5116                         goto out;
5117                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5118                 dst6->sin6_family = AF_INET6;
5119                 dst6->sin6_len = sizeof(*dst6);
5120                 dst6->sin6_addr = addr->v6;
5121                 break;
5122 #endif /* INET6 */
5123         default:
5124                 return (0);
5125         }
5126
5127         /* Skip checks for ipsec interfaces */
5128         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5129                 goto out;
5130
5131         switch (af) {
5132 #ifdef INET6
5133         case AF_INET6:
5134                 in6_rtalloc_ign(&ro, 0, rtableid);
5135                 break;
5136 #endif
5137 #ifdef INET
5138         case AF_INET:
5139                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5140                 break;
5141 #endif
5142         default:
5143                 rtalloc_ign((struct route *)&ro, 0);    /* No/default FIB. */
5144                 break;
5145         }
5146
5147         if (ro.ro_rt != NULL) {
5148                 /* No interface given, this is a no-route check */
5149                 if (kif == NULL)
5150                         goto out;
5151
5152                 if (kif->pfik_ifp == NULL) {
5153                         ret = 0;
5154                         goto out;
5155                 }
5156
5157                 /* Perform uRPF check if passed input interface */
5158                 ret = 0;
5159                 rn = (struct radix_node *)ro.ro_rt;
5160                 do {
5161                         rt = (struct rtentry *)rn;
5162                         ifp = rt->rt_ifp;
5163
5164                         if (kif->pfik_ifp == ifp)
5165                                 ret = 1;
5166 #ifdef RADIX_MPATH
5167                         rn = rn_mpath_next(rn);
5168 #endif
5169                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5170         } else
5171                 ret = 0;
5172 out:
5173         if (ro.ro_rt != NULL)
5174                 RTFREE(ro.ro_rt);
5175         return (ret);
5176 }
5177
5178 #ifdef INET
5179 static void
5180 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5181     struct pf_state *s, struct pf_pdesc *pd)
5182 {
5183         struct mbuf             *m0, *m1;
5184         struct sockaddr_in      dst;
5185         struct ip               *ip;
5186         struct ifnet            *ifp = NULL;
5187         struct pf_addr           naddr;
5188         struct pf_src_node      *sn = NULL;
5189         int                      error = 0;
5190         uint16_t                 ip_len, ip_off;
5191
5192         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5193         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5194             __func__));
5195
5196         if ((pd->pf_mtag == NULL &&
5197             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5198             pd->pf_mtag->routed++ > 3) {
5199                 m0 = *m;
5200                 *m = NULL;
5201                 goto bad_locked;
5202         }
5203
5204         if (r->rt == PF_DUPTO) {
5205                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5206                         if (s)
5207                                 PF_STATE_UNLOCK(s);
5208                         return;
5209                 }
5210         } else {
5211                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5212                         if (s)
5213                                 PF_STATE_UNLOCK(s);
5214                         return;
5215                 }
5216                 m0 = *m;
5217         }
5218
5219         ip = mtod(m0, struct ip *);
5220
5221         bzero(&dst, sizeof(dst));
5222         dst.sin_family = AF_INET;
5223         dst.sin_len = sizeof(dst);
5224         dst.sin_addr = ip->ip_dst;
5225
5226         if (r->rt == PF_FASTROUTE) {
5227                 struct rtentry *rt;
5228
5229                 if (s)
5230                         PF_STATE_UNLOCK(s);
5231                 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0));
5232                 if (rt == NULL) {
5233                         RTFREE_LOCKED(rt);
5234                         KMOD_IPSTAT_INC(ips_noroute);
5235                         error = EHOSTUNREACH;
5236                         goto bad;
5237                 }
5238
5239                 ifp = rt->rt_ifp;
5240                 rt->rt_rmx.rmx_pksent++;
5241
5242                 if (rt->rt_flags & RTF_GATEWAY)
5243                         bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst));
5244                 RTFREE_LOCKED(rt);
5245         } else {
5246                 if (TAILQ_EMPTY(&r->rpool.list)) {
5247                         DPFPRINTF(PF_DEBUG_URGENT,
5248                             ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5249                         goto bad_locked;
5250                 }
5251                 if (s == NULL) {
5252                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5253                             &naddr, NULL, &sn);
5254                         if (!PF_AZERO(&naddr, AF_INET))
5255                                 dst.sin_addr.s_addr = naddr.v4.s_addr;
5256                         ifp = r->rpool.cur->kif ?
5257                             r->rpool.cur->kif->pfik_ifp : NULL;
5258                 } else {
5259                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5260                                 dst.sin_addr.s_addr =
5261                                     s->rt_addr.v4.s_addr;
5262                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5263                         PF_STATE_UNLOCK(s);
5264                 }
5265         }
5266         if (ifp == NULL)
5267                 goto bad;
5268
5269         if (oifp != ifp) {
5270                 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5271                         goto bad;
5272                 else if (m0 == NULL)
5273                         goto done;
5274                 if (m0->m_len < sizeof(struct ip)) {
5275                         DPFPRINTF(PF_DEBUG_URGENT,
5276                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5277                         goto bad;
5278                 }
5279                 ip = mtod(m0, struct ip *);
5280         }
5281
5282         if (ifp->if_flags & IFF_LOOPBACK)
5283                 m0->m_flags |= M_SKIP_FIREWALL;
5284
5285         ip_len = ntohs(ip->ip_len);
5286         ip_off = ntohs(ip->ip_off);
5287
5288         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5289         m0->m_pkthdr.csum_flags |= CSUM_IP;
5290         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5291                 in_delayed_cksum(m0);
5292                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5293         }
5294 #ifdef SCTP
5295         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5296                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5297                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5298         }
5299 #endif
5300
5301         /*
5302          * If small enough for interface, or the interface will take
5303          * care of the fragmentation for us, we can just send directly.
5304          */
5305         if (ip_len <= ifp->if_mtu ||
5306             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 ||
5307             ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) {
5308                 ip->ip_sum = 0;
5309                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5310                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5311                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5312                 }
5313                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5314                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5315                 goto done;
5316         }
5317
5318         /* Balk when DF bit is set or the interface didn't support TSO. */
5319         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5320                 error = EMSGSIZE;
5321                 KMOD_IPSTAT_INC(ips_cantfrag);
5322                 if (r->rt != PF_DUPTO) {
5323                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5324                             ifp->if_mtu);
5325                         goto done;
5326                 } else
5327                         goto bad;
5328         }
5329
5330         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5331         if (error)
5332                 goto bad;
5333
5334         for (; m0; m0 = m1) {
5335                 m1 = m0->m_nextpkt;
5336                 m0->m_nextpkt = NULL;
5337                 if (error == 0) {
5338                         m_clrprotoflags(m0);
5339                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5340                 } else
5341                         m_freem(m0);
5342         }
5343
5344         if (error == 0)
5345                 KMOD_IPSTAT_INC(ips_fragmented);
5346
5347 done:
5348         if (r->rt != PF_DUPTO)
5349                 *m = NULL;
5350         return;
5351
5352 bad_locked:
5353         if (s)
5354                 PF_STATE_UNLOCK(s);
5355 bad:
5356         m_freem(m0);
5357         goto done;
5358 }
5359 #endif /* INET */
5360
5361 #ifdef INET6
5362 static void
5363 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5364     struct pf_state *s, struct pf_pdesc *pd)
5365 {
5366         struct mbuf             *m0;
5367         struct sockaddr_in6     dst;
5368         struct ip6_hdr          *ip6;
5369         struct ifnet            *ifp = NULL;
5370         struct pf_addr           naddr;
5371         struct pf_src_node      *sn = NULL;
5372
5373         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5374         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5375             __func__));
5376
5377         if ((pd->pf_mtag == NULL &&
5378             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5379             pd->pf_mtag->routed++ > 3) {
5380                 m0 = *m;
5381                 *m = NULL;
5382                 goto bad_locked;
5383         }
5384
5385         if (r->rt == PF_DUPTO) {
5386                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5387                         if (s)
5388                                 PF_STATE_UNLOCK(s);
5389                         return;
5390                 }
5391         } else {
5392                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5393                         if (s)
5394                                 PF_STATE_UNLOCK(s);
5395                         return;
5396                 }
5397                 m0 = *m;
5398         }
5399
5400         ip6 = mtod(m0, struct ip6_hdr *);
5401
5402         bzero(&dst, sizeof(dst));
5403         dst.sin6_family = AF_INET6;
5404         dst.sin6_len = sizeof(dst);
5405         dst.sin6_addr = ip6->ip6_dst;
5406
5407         /* Cheat. XXX why only in the v6 case??? */
5408         if (r->rt == PF_FASTROUTE) {
5409                 if (s)
5410                         PF_STATE_UNLOCK(s);
5411                 m0->m_flags |= M_SKIP_FIREWALL;
5412                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5413                 return;
5414         }
5415
5416         if (TAILQ_EMPTY(&r->rpool.list)) {
5417                 DPFPRINTF(PF_DEBUG_URGENT,
5418                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5419                 goto bad_locked;
5420         }
5421         if (s == NULL) {
5422                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5423                     &naddr, NULL, &sn);
5424                 if (!PF_AZERO(&naddr, AF_INET6))
5425                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5426                             &naddr, AF_INET6);
5427                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5428         } else {
5429                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5430                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5431                             &s->rt_addr, AF_INET6);
5432                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5433         }
5434
5435         if (s)
5436                 PF_STATE_UNLOCK(s);
5437
5438         if (ifp == NULL)
5439                 goto bad;
5440
5441         if (oifp != ifp) {
5442                 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5443                         goto bad;
5444                 else if (m0 == NULL)
5445                         goto done;
5446                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5447                         DPFPRINTF(PF_DEBUG_URGENT,
5448                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5449                             __func__));
5450                         goto bad;
5451                 }
5452                 ip6 = mtod(m0, struct ip6_hdr *);
5453         }
5454
5455         if (ifp->if_flags & IFF_LOOPBACK)
5456                 m0->m_flags |= M_SKIP_FIREWALL;
5457
5458         /*
5459          * If the packet is too large for the outgoing interface,
5460          * send back an icmp6 error.
5461          */
5462         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5463                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5464         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5465                 nd6_output(ifp, ifp, m0, &dst, NULL);
5466         else {
5467                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5468                 if (r->rt != PF_DUPTO)
5469                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5470                 else
5471                         goto bad;
5472         }
5473
5474 done:
5475         if (r->rt != PF_DUPTO)
5476                 *m = NULL;
5477         return;
5478
5479 bad_locked:
5480         if (s)
5481                 PF_STATE_UNLOCK(s);
5482 bad:
5483         m_freem(m0);
5484         goto done;
5485 }
5486 #endif /* INET6 */
5487
5488 /*
5489  * FreeBSD supports cksum offloads for the following drivers.
5490  *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
5491  *   ti(4), txp(4), xl(4)
5492  *
5493  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5494  *  network driver performed cksum including pseudo header, need to verify
5495  *   csum_data
5496  * CSUM_DATA_VALID :
5497  *  network driver performed cksum, needs to additional pseudo header
5498  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5499  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5500  *
5501  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5502  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5503  * TCP/UDP layer.
5504  * Also, set csum_data to 0xffff to force cksum validation.
5505  */
5506 static int
5507 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5508 {
5509         u_int16_t sum = 0;
5510         int hw_assist = 0;
5511         struct ip *ip;
5512
5513         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5514                 return (1);
5515         if (m->m_pkthdr.len < off + len)
5516                 return (1);
5517
5518         switch (p) {
5519         case IPPROTO_TCP:
5520                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5521                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5522                                 sum = m->m_pkthdr.csum_data;
5523                         } else {
5524                                 ip = mtod(m, struct ip *);
5525                                 sum = in_pseudo(ip->ip_src.s_addr,
5526                                 ip->ip_dst.s_addr, htonl((u_short)len +
5527                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5528                         }
5529                         sum ^= 0xffff;
5530                         ++hw_assist;
5531                 }
5532                 break;
5533         case IPPROTO_UDP:
5534                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5535                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5536                                 sum = m->m_pkthdr.csum_data;
5537                         } else {
5538                                 ip = mtod(m, struct ip *);
5539                                 sum = in_pseudo(ip->ip_src.s_addr,
5540                                 ip->ip_dst.s_addr, htonl((u_short)len +
5541                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5542                         }
5543                         sum ^= 0xffff;
5544                         ++hw_assist;
5545                 }
5546                 break;
5547         case IPPROTO_ICMP:
5548 #ifdef INET6
5549         case IPPROTO_ICMPV6:
5550 #endif /* INET6 */
5551                 break;
5552         default:
5553                 return (1);
5554         }
5555
5556         if (!hw_assist) {
5557                 switch (af) {
5558                 case AF_INET:
5559                         if (p == IPPROTO_ICMP) {
5560                                 if (m->m_len < off)
5561                                         return (1);
5562                                 m->m_data += off;
5563                                 m->m_len -= off;
5564                                 sum = in_cksum(m, len);
5565                                 m->m_data -= off;
5566                                 m->m_len += off;
5567                         } else {
5568                                 if (m->m_len < sizeof(struct ip))
5569                                         return (1);
5570                                 sum = in4_cksum(m, p, off, len);
5571                         }
5572                         break;
5573 #ifdef INET6
5574                 case AF_INET6:
5575                         if (m->m_len < sizeof(struct ip6_hdr))
5576                                 return (1);
5577                         sum = in6_cksum(m, p, off, len);
5578                         break;
5579 #endif /* INET6 */
5580                 default:
5581                         return (1);
5582                 }
5583         }
5584         if (sum) {
5585                 switch (p) {
5586                 case IPPROTO_TCP:
5587                     {
5588                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5589                         break;
5590                     }
5591                 case IPPROTO_UDP:
5592                     {
5593                         KMOD_UDPSTAT_INC(udps_badsum);
5594                         break;
5595                     }
5596 #ifdef INET
5597                 case IPPROTO_ICMP:
5598                     {
5599                         KMOD_ICMPSTAT_INC(icps_checksum);
5600                         break;
5601                     }
5602 #endif
5603 #ifdef INET6
5604                 case IPPROTO_ICMPV6:
5605                     {
5606                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5607                         break;
5608                     }
5609 #endif /* INET6 */
5610                 }
5611                 return (1);
5612         } else {
5613                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5614                         m->m_pkthdr.csum_flags |=
5615                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5616                         m->m_pkthdr.csum_data = 0xffff;
5617                 }
5618         }
5619         return (0);
5620 }
5621
5622
5623 #ifdef INET
5624 int
5625 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5626 {
5627         struct pfi_kif          *kif;
5628         u_short                  action, reason = 0, log = 0;
5629         struct mbuf             *m = *m0;
5630         struct ip               *h = NULL;
5631         struct m_tag            *ipfwtag;
5632         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5633         struct pf_state         *s = NULL;
5634         struct pf_ruleset       *ruleset = NULL;
5635         struct pf_pdesc          pd;
5636         int                      off, dirndx, pqid = 0;
5637
5638         M_ASSERTPKTHDR(m);
5639
5640         if (!V_pf_status.running)
5641                 return (PF_PASS);
5642
5643         memset(&pd, 0, sizeof(pd));
5644
5645         kif = (struct pfi_kif *)ifp->if_pf_kif;
5646
5647         if (kif == NULL) {
5648                 DPFPRINTF(PF_DEBUG_URGENT,
5649                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5650                 return (PF_DROP);
5651         }
5652         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5653                 return (PF_PASS);
5654
5655         if (m->m_flags & M_SKIP_FIREWALL)
5656                 return (PF_PASS);
5657
5658         pd.pf_mtag = pf_find_mtag(m);
5659
5660         PF_RULES_RLOCK();
5661
5662         if (ip_divert_ptr != NULL &&
5663             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5664                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5665                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5666                         if (pd.pf_mtag == NULL &&
5667                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5668                                 action = PF_DROP;
5669                                 goto done;
5670                         }
5671                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5672                         m_tag_delete(m, ipfwtag);
5673                 }
5674                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5675                         m->m_flags |= M_FASTFWD_OURS;
5676                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5677                 }
5678         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5679                 /* We do IP header normalization and packet reassembly here */
5680                 action = PF_DROP;
5681                 goto done;
5682         }
5683         m = *m0;        /* pf_normalize messes with m0 */
5684         h = mtod(m, struct ip *);
5685
5686         off = h->ip_hl << 2;
5687         if (off < (int)sizeof(struct ip)) {
5688                 action = PF_DROP;
5689                 REASON_SET(&reason, PFRES_SHORT);
5690                 log = 1;
5691                 goto done;
5692         }
5693
5694         pd.src = (struct pf_addr *)&h->ip_src;
5695         pd.dst = (struct pf_addr *)&h->ip_dst;
5696         pd.sport = pd.dport = NULL;
5697         pd.ip_sum = &h->ip_sum;
5698         pd.proto_sum = NULL;
5699         pd.proto = h->ip_p;
5700         pd.dir = dir;
5701         pd.sidx = (dir == PF_IN) ? 0 : 1;
5702         pd.didx = (dir == PF_IN) ? 1 : 0;
5703         pd.af = AF_INET;
5704         pd.tos = h->ip_tos;
5705         pd.tot_len = ntohs(h->ip_len);
5706
5707         /* handle fragments that didn't get reassembled by normalization */
5708         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5709                 action = pf_test_fragment(&r, dir, kif, m, h,
5710                     &pd, &a, &ruleset);
5711                 goto done;
5712         }
5713
5714         switch (h->ip_p) {
5715
5716         case IPPROTO_TCP: {
5717                 struct tcphdr   th;
5718
5719                 pd.hdr.tcp = &th;
5720                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5721                     &action, &reason, AF_INET)) {
5722                         log = action != PF_PASS;
5723                         goto done;
5724                 }
5725                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5726                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5727                         pqid = 1;
5728                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5729                 if (action == PF_DROP)
5730                         goto done;
5731                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5732                     &reason);
5733                 if (action == PF_PASS) {
5734                         if (pfsync_update_state_ptr != NULL)
5735                                 pfsync_update_state_ptr(s);
5736                         r = s->rule.ptr;
5737                         a = s->anchor.ptr;
5738                         log = s->log;
5739                 } else if (s == NULL)
5740                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5741                             &a, &ruleset, inp);
5742                 break;
5743         }
5744
5745         case IPPROTO_UDP: {
5746                 struct udphdr   uh;
5747
5748                 pd.hdr.udp = &uh;
5749                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5750                     &action, &reason, AF_INET)) {
5751                         log = action != PF_PASS;
5752                         goto done;
5753                 }
5754                 if (uh.uh_dport == 0 ||
5755                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5756                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5757                         action = PF_DROP;
5758                         REASON_SET(&reason, PFRES_SHORT);
5759                         goto done;
5760                 }
5761                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5762                 if (action == PF_PASS) {
5763                         if (pfsync_update_state_ptr != NULL)
5764                                 pfsync_update_state_ptr(s);
5765                         r = s->rule.ptr;
5766                         a = s->anchor.ptr;
5767                         log = s->log;
5768                 } else if (s == NULL)
5769                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5770                             &a, &ruleset, inp);
5771                 break;
5772         }
5773
5774         case IPPROTO_ICMP: {
5775                 struct icmp     ih;
5776
5777                 pd.hdr.icmp = &ih;
5778                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5779                     &action, &reason, AF_INET)) {
5780                         log = action != PF_PASS;
5781                         goto done;
5782                 }
5783                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
5784                     &reason);
5785                 if (action == PF_PASS) {
5786                         if (pfsync_update_state_ptr != NULL)
5787                                 pfsync_update_state_ptr(s);
5788                         r = s->rule.ptr;
5789                         a = s->anchor.ptr;
5790                         log = s->log;
5791                 } else if (s == NULL)
5792                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5793                             &a, &ruleset, inp);
5794                 break;
5795         }
5796
5797 #ifdef INET6
5798         case IPPROTO_ICMPV6: {
5799                 action = PF_DROP;
5800                 DPFPRINTF(PF_DEBUG_MISC,
5801                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
5802                 goto done;
5803         }
5804 #endif
5805
5806         default:
5807                 action = pf_test_state_other(&s, dir, kif, m, &pd);
5808                 if (action == PF_PASS) {
5809                         if (pfsync_update_state_ptr != NULL)
5810                                 pfsync_update_state_ptr(s);
5811                         r = s->rule.ptr;
5812                         a = s->anchor.ptr;
5813                         log = s->log;
5814                 } else if (s == NULL)
5815                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5816                             &a, &ruleset, inp);
5817                 break;
5818         }
5819
5820 done:
5821         PF_RULES_RUNLOCK();
5822         if (action == PF_PASS && h->ip_hl > 5 &&
5823             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
5824                 action = PF_DROP;
5825                 REASON_SET(&reason, PFRES_IPOPTIONS);
5826                 log = 1;
5827                 DPFPRINTF(PF_DEBUG_MISC,
5828                     ("pf: dropping packet with ip options\n"));
5829         }
5830
5831         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
5832                 action = PF_DROP;
5833                 REASON_SET(&reason, PFRES_MEMORY);
5834         }
5835         if (r->rtableid >= 0)
5836                 M_SETFIB(m, r->rtableid);
5837
5838 #ifdef ALTQ
5839         if (action == PF_PASS && r->qid) {
5840                 if (pd.pf_mtag == NULL &&
5841                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5842                         action = PF_DROP;
5843                         REASON_SET(&reason, PFRES_MEMORY);
5844                 }
5845                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
5846                         pd.pf_mtag->qid = r->pqid;
5847                 else
5848                         pd.pf_mtag->qid = r->qid;
5849                 /* add hints for ecn */
5850                 pd.pf_mtag->hdr = h;
5851
5852         }
5853 #endif /* ALTQ */
5854
5855         /*
5856          * connections redirected to loopback should not match sockets
5857          * bound specifically to loopback due to security implications,
5858          * see tcp_input() and in_pcblookup_listen().
5859          */
5860         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5861             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5862             (s->nat_rule.ptr->action == PF_RDR ||
5863             s->nat_rule.ptr->action == PF_BINAT) &&
5864             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
5865                 m->m_flags |= M_SKIP_FIREWALL;
5866
5867         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
5868             !PACKET_LOOPED(&pd)) {
5869
5870                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
5871                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
5872                 if (ipfwtag != NULL) {
5873                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
5874                             ntohs(r->divert.port);
5875                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
5876
5877                         if (s)
5878                                 PF_STATE_UNLOCK(s);
5879
5880                         m_tag_prepend(m, ipfwtag);
5881                         if (m->m_flags & M_FASTFWD_OURS) {
5882                                 if (pd.pf_mtag == NULL &&
5883                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5884                                         action = PF_DROP;
5885                                         REASON_SET(&reason, PFRES_MEMORY);
5886                                         log = 1;
5887                                         DPFPRINTF(PF_DEBUG_MISC,
5888                                             ("pf: failed to allocate tag\n"));
5889                                 }
5890                                 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT;
5891                                 m->m_flags &= ~M_FASTFWD_OURS;
5892                         }
5893                         ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
5894                         *m0 = NULL;
5895
5896                         return (action);
5897                 } else {
5898                         /* XXX: ipfw has the same behaviour! */
5899                         action = PF_DROP;
5900                         REASON_SET(&reason, PFRES_MEMORY);
5901                         log = 1;
5902                         DPFPRINTF(PF_DEBUG_MISC,
5903                             ("pf: failed to allocate divert tag\n"));
5904                 }
5905         }
5906
5907         if (log) {
5908                 struct pf_rule *lr;
5909
5910                 if (s != NULL && s->nat_rule.ptr != NULL &&
5911                     s->nat_rule.ptr->log & PF_LOG_ALL)
5912                         lr = s->nat_rule.ptr;
5913                 else
5914                         lr = r;
5915                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
5916                     (s == NULL));
5917         }
5918
5919         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
5920         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
5921
5922         if (action == PF_PASS || r->action == PF_DROP) {
5923                 dirndx = (dir == PF_OUT);
5924                 r->packets[dirndx]++;
5925                 r->bytes[dirndx] += pd.tot_len;
5926                 if (a != NULL) {
5927                         a->packets[dirndx]++;
5928                         a->bytes[dirndx] += pd.tot_len;
5929                 }
5930                 if (s != NULL) {
5931                         if (s->nat_rule.ptr != NULL) {
5932                                 s->nat_rule.ptr->packets[dirndx]++;
5933                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
5934                         }
5935                         if (s->src_node != NULL) {
5936                                 s->src_node->packets[dirndx]++;
5937                                 s->src_node->bytes[dirndx] += pd.tot_len;
5938                         }
5939                         if (s->nat_src_node != NULL) {
5940                                 s->nat_src_node->packets[dirndx]++;
5941                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
5942                         }
5943                         dirndx = (dir == s->direction) ? 0 : 1;
5944                         s->packets[dirndx]++;
5945                         s->bytes[dirndx] += pd.tot_len;
5946                 }
5947                 tr = r;
5948                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
5949                 if (nr != NULL && r == &V_pf_default_rule)
5950                         tr = nr;
5951                 if (tr->src.addr.type == PF_ADDR_TABLE)
5952                         pfr_update_stats(tr->src.addr.p.tbl,
5953                             (s == NULL) ? pd.src :
5954                             &s->key[(s->direction == PF_IN)]->
5955                                 addr[(s->direction == PF_OUT)],
5956                             pd.af, pd.tot_len, dir == PF_OUT,
5957                             r->action == PF_PASS, tr->src.neg);
5958                 if (tr->dst.addr.type == PF_ADDR_TABLE)
5959                         pfr_update_stats(tr->dst.addr.p.tbl,
5960                             (s == NULL) ? pd.dst :
5961                             &s->key[(s->direction == PF_IN)]->
5962                                 addr[(s->direction == PF_IN)],
5963                             pd.af, pd.tot_len, dir == PF_OUT,
5964                             r->action == PF_PASS, tr->dst.neg);
5965         }
5966
5967         switch (action) {
5968         case PF_SYNPROXY_DROP:
5969                 m_freem(*m0);
5970         case PF_DEFER:
5971                 *m0 = NULL;
5972                 action = PF_PASS;
5973                 break;
5974         default:
5975                 /* pf_route() returns unlocked. */
5976                 if (r->rt) {
5977                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
5978                         return (action);
5979                 }
5980                 break;
5981         }
5982         if (s)
5983                 PF_STATE_UNLOCK(s);
5984
5985         return (action);
5986 }
5987 #endif /* INET */
5988
5989 #ifdef INET6
5990 int
5991 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5992 {
5993         struct pfi_kif          *kif;
5994         u_short                  action, reason = 0, log = 0;
5995         struct mbuf             *m = *m0, *n = NULL;
5996         struct ip6_hdr          *h = NULL;
5997         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5998         struct pf_state         *s = NULL;
5999         struct pf_ruleset       *ruleset = NULL;
6000         struct pf_pdesc          pd;
6001         int                      off, terminal = 0, dirndx, rh_cnt = 0;
6002
6003         M_ASSERTPKTHDR(m);
6004
6005         if (!V_pf_status.running)
6006                 return (PF_PASS);
6007
6008         memset(&pd, 0, sizeof(pd));
6009         pd.pf_mtag = pf_find_mtag(m);
6010
6011         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6012                 return (PF_PASS);
6013
6014         kif = (struct pfi_kif *)ifp->if_pf_kif;
6015         if (kif == NULL) {
6016                 DPFPRINTF(PF_DEBUG_URGENT,
6017                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6018                 return (PF_DROP);
6019         }
6020         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6021                 return (PF_PASS);
6022
6023         PF_RULES_RLOCK();
6024
6025         /* We do IP header normalization and packet reassembly here */
6026         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6027                 action = PF_DROP;
6028                 goto done;
6029         }
6030         m = *m0;        /* pf_normalize messes with m0 */
6031         h = mtod(m, struct ip6_hdr *);
6032
6033 #if 1
6034         /*
6035          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6036          * will do something bad, so drop the packet for now.
6037          */
6038         if (htons(h->ip6_plen) == 0) {
6039                 action = PF_DROP;
6040                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6041                 goto done;
6042         }
6043 #endif
6044
6045         pd.src = (struct pf_addr *)&h->ip6_src;
6046         pd.dst = (struct pf_addr *)&h->ip6_dst;
6047         pd.sport = pd.dport = NULL;
6048         pd.ip_sum = NULL;
6049         pd.proto_sum = NULL;
6050         pd.dir = dir;
6051         pd.sidx = (dir == PF_IN) ? 0 : 1;
6052         pd.didx = (dir == PF_IN) ? 1 : 0;
6053         pd.af = AF_INET6;
6054         pd.tos = 0;
6055         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6056
6057         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6058         pd.proto = h->ip6_nxt;
6059         do {
6060                 switch (pd.proto) {
6061                 case IPPROTO_FRAGMENT:
6062                         action = pf_test_fragment(&r, dir, kif, m, h,
6063                             &pd, &a, &ruleset);
6064                         if (action == PF_DROP)
6065                                 REASON_SET(&reason, PFRES_FRAG);
6066                         goto done;
6067                 case IPPROTO_ROUTING: {
6068                         struct ip6_rthdr rthdr;
6069
6070                         if (rh_cnt++) {
6071                                 DPFPRINTF(PF_DEBUG_MISC,
6072                                     ("pf: IPv6 more than one rthdr\n"));
6073                                 action = PF_DROP;
6074                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6075                                 log = 1;
6076                                 goto done;
6077                         }
6078                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6079                             &reason, pd.af)) {
6080                                 DPFPRINTF(PF_DEBUG_MISC,
6081                                     ("pf: IPv6 short rthdr\n"));
6082                                 action = PF_DROP;
6083                                 REASON_SET(&reason, PFRES_SHORT);
6084                                 log = 1;
6085                                 goto done;
6086                         }
6087                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6088                                 DPFPRINTF(PF_DEBUG_MISC,
6089                                     ("pf: IPv6 rthdr0\n"));
6090                                 action = PF_DROP;
6091                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6092                                 log = 1;
6093                                 goto done;
6094                         }
6095                         /* FALLTHROUGH */
6096                 }
6097                 case IPPROTO_AH:
6098                 case IPPROTO_HOPOPTS:
6099                 case IPPROTO_DSTOPTS: {
6100                         /* get next header and header length */
6101                         struct ip6_ext  opt6;
6102
6103                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6104                             NULL, &reason, pd.af)) {
6105                                 DPFPRINTF(PF_DEBUG_MISC,
6106                                     ("pf: IPv6 short opt\n"));
6107                                 action = PF_DROP;
6108                                 log = 1;
6109                                 goto done;
6110                         }
6111                         if (pd.proto == IPPROTO_AH)
6112                                 off += (opt6.ip6e_len + 2) * 4;
6113                         else
6114                                 off += (opt6.ip6e_len + 1) * 8;
6115                         pd.proto = opt6.ip6e_nxt;
6116                         /* goto the next header */
6117                         break;
6118                 }
6119                 default:
6120                         terminal++;
6121                         break;
6122                 }
6123         } while (!terminal);
6124
6125         /* if there's no routing header, use unmodified mbuf for checksumming */
6126         if (!n)
6127                 n = m;
6128
6129         switch (pd.proto) {
6130
6131         case IPPROTO_TCP: {
6132                 struct tcphdr   th;
6133
6134                 pd.hdr.tcp = &th;
6135                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6136                     &action, &reason, AF_INET6)) {
6137                         log = action != PF_PASS;
6138                         goto done;
6139                 }
6140                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6141                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6142                 if (action == PF_DROP)
6143                         goto done;
6144                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6145                     &reason);
6146                 if (action == PF_PASS) {
6147                         if (pfsync_update_state_ptr != NULL)
6148                                 pfsync_update_state_ptr(s);
6149                         r = s->rule.ptr;
6150                         a = s->anchor.ptr;
6151                         log = s->log;
6152                 } else if (s == NULL)
6153                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6154                             &a, &ruleset, inp);
6155                 break;
6156         }
6157
6158         case IPPROTO_UDP: {
6159                 struct udphdr   uh;
6160
6161                 pd.hdr.udp = &uh;
6162                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6163                     &action, &reason, AF_INET6)) {
6164                         log = action != PF_PASS;
6165                         goto done;
6166                 }
6167                 if (uh.uh_dport == 0 ||
6168                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6169                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6170                         action = PF_DROP;
6171                         REASON_SET(&reason, PFRES_SHORT);
6172                         goto done;
6173                 }
6174                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6175                 if (action == PF_PASS) {
6176                         if (pfsync_update_state_ptr != NULL)
6177                                 pfsync_update_state_ptr(s);
6178                         r = s->rule.ptr;
6179                         a = s->anchor.ptr;
6180                         log = s->log;
6181                 } else if (s == NULL)
6182                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6183                             &a, &ruleset, inp);
6184                 break;
6185         }
6186
6187         case IPPROTO_ICMP: {
6188                 action = PF_DROP;
6189                 DPFPRINTF(PF_DEBUG_MISC,
6190                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6191                 goto done;
6192         }
6193
6194         case IPPROTO_ICMPV6: {
6195                 struct icmp6_hdr        ih;
6196
6197                 pd.hdr.icmp6 = &ih;
6198                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6199                     &action, &reason, AF_INET6)) {
6200                         log = action != PF_PASS;
6201                         goto done;
6202                 }
6203                 action = pf_test_state_icmp(&s, dir, kif,
6204                     m, off, h, &pd, &reason);
6205                 if (action == PF_PASS) {
6206                         if (pfsync_update_state_ptr != NULL)
6207                                 pfsync_update_state_ptr(s);
6208                         r = s->rule.ptr;
6209                         a = s->anchor.ptr;
6210                         log = s->log;
6211                 } else if (s == NULL)
6212                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6213                             &a, &ruleset, inp);
6214                 break;
6215         }
6216
6217         default:
6218                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6219                 if (action == PF_PASS) {
6220                         if (pfsync_update_state_ptr != NULL)
6221                                 pfsync_update_state_ptr(s);
6222                         r = s->rule.ptr;
6223                         a = s->anchor.ptr;
6224                         log = s->log;
6225                 } else if (s == NULL)
6226                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6227                             &a, &ruleset, inp);
6228                 break;
6229         }
6230
6231 done:
6232         PF_RULES_RUNLOCK();
6233         if (n != m) {
6234                 m_freem(n);
6235                 n = NULL;
6236         }
6237
6238         /* handle dangerous IPv6 extension headers. */
6239         if (action == PF_PASS && rh_cnt &&
6240             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6241                 action = PF_DROP;
6242                 REASON_SET(&reason, PFRES_IPOPTIONS);
6243                 log = 1;
6244                 DPFPRINTF(PF_DEBUG_MISC,
6245                     ("pf: dropping packet with dangerous v6 headers\n"));
6246         }
6247
6248         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6249                 action = PF_DROP;
6250                 REASON_SET(&reason, PFRES_MEMORY);
6251         }
6252         if (r->rtableid >= 0)
6253                 M_SETFIB(m, r->rtableid);
6254
6255 #ifdef ALTQ
6256         if (action == PF_PASS && r->qid) {
6257                 if (pd.pf_mtag == NULL &&
6258                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6259                         action = PF_DROP;
6260                         REASON_SET(&reason, PFRES_MEMORY);
6261                 }
6262                 if (pd.tos & IPTOS_LOWDELAY)
6263                         pd.pf_mtag->qid = r->pqid;
6264                 else
6265                         pd.pf_mtag->qid = r->qid;
6266                 /* add hints for ecn */
6267                 pd.pf_mtag->hdr = h;
6268         }
6269 #endif /* ALTQ */
6270
6271         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6272             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6273             (s->nat_rule.ptr->action == PF_RDR ||
6274             s->nat_rule.ptr->action == PF_BINAT) &&
6275             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6276                 m->m_flags |= M_SKIP_FIREWALL;
6277
6278         /* XXX: Anybody working on it?! */
6279         if (r->divert.port)
6280                 printf("pf: divert(9) is not supported for IPv6\n");
6281
6282         if (log) {
6283                 struct pf_rule *lr;
6284
6285                 if (s != NULL && s->nat_rule.ptr != NULL &&
6286                     s->nat_rule.ptr->log & PF_LOG_ALL)
6287                         lr = s->nat_rule.ptr;
6288                 else
6289                         lr = r;
6290                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6291                     &pd, (s == NULL));
6292         }
6293
6294         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6295         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6296
6297         if (action == PF_PASS || r->action == PF_DROP) {
6298                 dirndx = (dir == PF_OUT);
6299                 r->packets[dirndx]++;
6300                 r->bytes[dirndx] += pd.tot_len;
6301                 if (a != NULL) {
6302                         a->packets[dirndx]++;
6303                         a->bytes[dirndx] += pd.tot_len;
6304                 }
6305                 if (s != NULL) {
6306                         if (s->nat_rule.ptr != NULL) {
6307                                 s->nat_rule.ptr->packets[dirndx]++;
6308                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6309                         }
6310                         if (s->src_node != NULL) {
6311                                 s->src_node->packets[dirndx]++;
6312                                 s->src_node->bytes[dirndx] += pd.tot_len;
6313                         }
6314                         if (s->nat_src_node != NULL) {
6315                                 s->nat_src_node->packets[dirndx]++;
6316                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6317                         }
6318                         dirndx = (dir == s->direction) ? 0 : 1;
6319                         s->packets[dirndx]++;
6320                         s->bytes[dirndx] += pd.tot_len;
6321                 }
6322                 tr = r;
6323                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6324                 if (nr != NULL && r == &V_pf_default_rule)
6325                         tr = nr;
6326                 if (tr->src.addr.type == PF_ADDR_TABLE)
6327                         pfr_update_stats(tr->src.addr.p.tbl,
6328                             (s == NULL) ? pd.src :
6329                             &s->key[(s->direction == PF_IN)]->addr[0],
6330                             pd.af, pd.tot_len, dir == PF_OUT,
6331                             r->action == PF_PASS, tr->src.neg);
6332                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6333                         pfr_update_stats(tr->dst.addr.p.tbl,
6334                             (s == NULL) ? pd.dst :
6335                             &s->key[(s->direction == PF_IN)]->addr[1],
6336                             pd.af, pd.tot_len, dir == PF_OUT,
6337                             r->action == PF_PASS, tr->dst.neg);
6338         }
6339
6340         switch (action) {
6341         case PF_SYNPROXY_DROP:
6342                 m_freem(*m0);
6343         case PF_DEFER:
6344                 *m0 = NULL;
6345                 action = PF_PASS;
6346                 break;
6347         default:
6348                 /* pf_route6() returns unlocked. */
6349                 if (r->rt) {
6350                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6351                         return (action);
6352                 }
6353                 break;
6354         }
6355
6356         if (s)
6357                 PF_STATE_UNLOCK(s);
6358
6359         return (action);
6360 }
6361 #endif /* INET6 */