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_var.h>
  65 #include <net/if_types.h>
  66 #include <net/if_vlan_var.h>
  67 #include <net/route.h>
  68 #include <net/radix_mpath.h>
  69 #include <net/vnet.h>
  70
  71 #include <net/pfvar.h>
  72 #include <net/if_pflog.h>
  73 #include <net/if_pfsync.h>
  74
  75 #include <netinet/in_pcb.h>
  76 #include <netinet/in_var.h>
  77 #include <netinet/in_fib.h>
  78 #include <netinet/ip.h>
  79 #include <netinet/ip_fw.h>
  80 #include <netinet/ip_icmp.h>
  81 #include <netinet/icmp_var.h>
  82 #include <netinet/ip_var.h>
  83 #include <netinet/tcp.h>
  84 #include <netinet/tcp_fsm.h>
  85 #include <netinet/tcp_seq.h>
  86 #include <netinet/tcp_timer.h>
  87 #include <netinet/tcp_var.h>
  88 #include <netinet/udp.h>
  89 #include <netinet/udp_var.h>
  90
  91 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
  92
  93 #ifdef INET6
  94 #include <netinet/ip6.h>
  95 #include <netinet/icmp6.h>
  96 #include <netinet6/nd6.h>
  97 #include <netinet6/ip6_var.h>
  98 #include <netinet6/in6_pcb.h>
  99 #include <netinet6/in6_fib.h>
 100 #include <netinet6/scope6_var.h>
 101 #endif /* INET6 */
 102
 103 #include <machine/in_cksum.h>
 104 #include <security/mac/mac_framework.h>
 105
 106 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 107
 108 /*
 109  * Global variables
 110  */
 111
 112 /* state tables */
 113 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[2]);
 114 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 115 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 116 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 117 VNET_DEFINE(struct pf_kstatus,           pf_status);
 118
 119 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 120 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 121 VNET_DEFINE(int,                         altqs_inactive_open);
 122 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 123
 124 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 125 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 126 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 127 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 128 VNET_DEFINE(int,                         pf_tcp_secret_init);
 129 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 130 VNET_DEFINE(int,                         pf_tcp_iss_off);
 131 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 132
 133 /*
 134  * Queue for pf_intr() sends.
 135  */
 136 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 137 struct pf_send_entry {
 138         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 139         struct mbuf                     *pfse_m;
 140         enum {
 141                 PFSE_IP,
 142                 PFSE_IP6,
 143                 PFSE_ICMP,
 144                 PFSE_ICMP6,
 145         }                               pfse_type;
 146         struct {
 147                 int             type;
 148                 int             code;
 149                 int             mtu;
 150         } icmpopts;
 151 };
 152
 153 STAILQ_HEAD(pf_send_head, pf_send_entry);
 154 static VNET_DEFINE(struct pf_send_head, pf_sendqueue);
 155 #define V_pf_sendqueue  VNET(pf_sendqueue)
 156
 157 static struct mtx pf_sendqueue_mtx;
 158 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
 159 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 160 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 161
 162 /*
 163  * Queue for pf_overload_task() tasks.
 164  */
 165 struct pf_overload_entry {
 166         SLIST_ENTRY(pf_overload_entry)  next;
 167         struct pf_addr                  addr;
 168         sa_family_t                     af;
 169         uint8_t                         dir;
 170         struct pf_rule                  *rule;
 171 };
 172
 173 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 174 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue);
 175 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 176 static VNET_DEFINE(struct task, pf_overloadtask);
 177 #define V_pf_overloadtask       VNET(pf_overloadtask)
 178
 179 static struct mtx pf_overloadqueue_mtx;
 180 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
 181     "pf overload/flush queue", MTX_DEF);
 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 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
 188     MTX_DEF);
 189
 190 static VNET_DEFINE(uma_zone_t,  pf_sources_z);
 191 #define V_pf_sources_z  VNET(pf_sources_z)
 192 uma_zone_t              pf_mtag_z;
 193 VNET_DEFINE(uma_zone_t,  pf_state_z);
 194 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 195
 196 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 197 #define PFID_CPUBITS    8
 198 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 199 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 200 #define PFID_MAXID      (~PFID_CPUMASK)
 201 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU);
 202
 203 static void              pf_src_tree_remove_state(struct pf_state *);
 204 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 205                             u_int32_t);
 206 static void              pf_add_threshold(struct pf_threshold *);
 207 static int               pf_check_threshold(struct pf_threshold *);
 208
 209 static void              pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 210                             u_int16_t *, u_int16_t *, struct pf_addr *,
 211                             u_int16_t, u_int8_t, sa_family_t);
 212 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 213                             struct tcphdr *, struct pf_state_peer *);
 214 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 215                             struct pf_addr *, struct pf_addr *, u_int16_t,
 216                             u_int16_t *, u_int16_t *, u_int16_t *,
 217                             u_int16_t *, u_int8_t, sa_family_t);
 218 static void              pf_send_tcp(struct mbuf *,
 219                             const struct pf_rule *, sa_family_t,
 220                             const struct pf_addr *, const struct pf_addr *,
 221                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 222                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 223                             u_int16_t, struct ifnet *);
 224 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 225                             sa_family_t, struct pf_rule *);
 226 static void              pf_detach_state(struct pf_state *);
 227 static int               pf_state_key_attach(struct pf_state_key *,
 228                             struct pf_state_key *, struct pf_state *);
 229 static void              pf_state_key_detach(struct pf_state *, int);
 230 static int               pf_state_key_ctor(void *, int, void *, int);
 231 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 232 static int               pf_test_rule(struct pf_rule **, struct pf_state **,
 233                             int, struct pfi_kif *, struct mbuf *, int,
 234                             struct pf_pdesc *, struct pf_rule **,
 235                             struct pf_ruleset **, struct inpcb *);
 236 static int               pf_create_state(struct pf_rule *, struct pf_rule *,
 237                             struct pf_rule *, struct pf_pdesc *,
 238                             struct pf_src_node *, struct pf_state_key *,
 239                             struct pf_state_key *, struct mbuf *, int,
 240                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 241                             struct pf_state **, int, u_int16_t, u_int16_t,
 242                             int);
 243 static int               pf_test_fragment(struct pf_rule **, int,
 244                             struct pfi_kif *, struct mbuf *, void *,
 245                             struct pf_pdesc *, struct pf_rule **,
 246                             struct pf_ruleset **);
 247 static int               pf_tcp_track_full(struct pf_state_peer *,
 248                             struct pf_state_peer *, struct pf_state **,
 249                             struct pfi_kif *, struct mbuf *, int,
 250                             struct pf_pdesc *, u_short *, int *);
 251 static int               pf_tcp_track_sloppy(struct pf_state_peer *,
 252                             struct pf_state_peer *, struct pf_state **,
 253                             struct pf_pdesc *, u_short *);
 254 static int               pf_test_state_tcp(struct pf_state **, int,
 255                             struct pfi_kif *, struct mbuf *, int,
 256                             void *, struct pf_pdesc *, u_short *);
 257 static int               pf_test_state_udp(struct pf_state **, int,
 258                             struct pfi_kif *, struct mbuf *, int,
 259                             void *, struct pf_pdesc *);
 260 static int               pf_test_state_icmp(struct pf_state **, int,
 261                             struct pfi_kif *, struct mbuf *, int,
 262                             void *, struct pf_pdesc *, u_short *);
 263 static int               pf_test_state_other(struct pf_state **, int,
 264                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 265 static u_int8_t          pf_get_wscale(struct mbuf *, int, u_int16_t,
 266                             sa_family_t);
 267 static u_int16_t         pf_get_mss(struct mbuf *, int, u_int16_t,
 268                             sa_family_t);
 269 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 270                                 int, u_int16_t);
 271 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 272                             u_int8_t, sa_family_t);
 273 static void              pf_print_state_parts(struct pf_state *,
 274                             struct pf_state_key *, struct pf_state_key *);
 275 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 276                             struct pf_addr_wrap *);
 277 static struct pf_state  *pf_find_state(struct pfi_kif *,
 278                             struct pf_state_key_cmp *, u_int);
 279 static int               pf_src_connlimit(struct pf_state **);
 280 static void              pf_overload_task(void *v, int pending);
 281 static int               pf_insert_src_node(struct pf_src_node **,
 282                             struct pf_rule *, struct pf_addr *, sa_family_t);
 283 static u_int             pf_purge_expired_states(u_int, int);
 284 static void              pf_purge_unlinked_rules(void);
 285 static int               pf_mtag_uminit(void *, int, int);
 286 static void              pf_mtag_free(struct m_tag *);
 287 #ifdef INET
 288 static void              pf_route(struct mbuf **, struct pf_rule *, int,
 289                             struct ifnet *, struct pf_state *,
 290                             struct pf_pdesc *);
 291 #endif /* INET */
 292 #ifdef INET6
 293 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 294                             struct pf_addr *, u_int8_t);
 295 static void              pf_route6(struct mbuf **, struct pf_rule *, int,
 296                             struct ifnet *, struct pf_state *,
 297                             struct pf_pdesc *);
 298 #endif /* INET6 */
 299
 300 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 301
 302 extern int pf_end_threads;
 303
 304 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 305
 306 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 307                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 308
 309 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 310         do {                                                            \
 311                 (s) = pf_find_state((i), (k), (d));                     \
 312                 if ((s) == NULL)                                        \
 313                         return (PF_DROP);                               \
 314                 if (PACKET_LOOPED(pd))                                  \
 315                         return (PF_PASS);                               \
 316                 if ((d) == PF_OUT &&                                    \
 317                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 318                     (s)->rule.ptr->direction == PF_OUT) ||              \
 319                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 320                     (s)->rule.ptr->direction == PF_IN)) &&              \
 321                     (s)->rt_kif != NULL &&                              \
 322                     (s)->rt_kif != (i))                                 \
 323                         return (PF_PASS);                               \
 324         } while (0)
 325
 326 #define BOUND_IFACE(r, k) \
 327         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 328
 329 #define STATE_INC_COUNTERS(s)                                           \
 330         do {                                                            \
 331                 counter_u64_add(s->rule.ptr->states_cur, 1);            \
 332                 counter_u64_add(s->rule.ptr->states_tot, 1);            \
 333                 if (s->anchor.ptr != NULL) {                            \
 334                         counter_u64_add(s->anchor.ptr->states_cur, 1);  \
 335                         counter_u64_add(s->anchor.ptr->states_tot, 1);  \
 336                 }                                                       \
 337                 if (s->nat_rule.ptr != NULL) {                          \
 338                         counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
 339                         counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
 340                 }                                                       \
 341         } while (0)
 342
 343 #define STATE_DEC_COUNTERS(s)                                           \
 344         do {                                                            \
 345                 if (s->nat_rule.ptr != NULL)                            \
 346                         counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
 347                 if (s->anchor.ptr != NULL)                              \
 348                         counter_u64_add(s->anchor.ptr->states_cur, -1); \
 349                 counter_u64_add(s->rule.ptr->states_cur, -1);           \
 350         } while (0)
 351
 352 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 353 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 354 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 355 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 356
 357 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
 358
 359 u_long  pf_hashmask;
 360 u_long  pf_srchashmask;
 361 static u_long   pf_hashsize;
 362 static u_long   pf_srchashsize;
 363
 364 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 365     &pf_hashsize, 0, "Size of pf(4) states hashtable");
 366 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 367     &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
 368
 369 VNET_DEFINE(void *, pf_swi_cookie);
 370
 371 VNET_DEFINE(uint32_t, pf_hashseed);
 372 #define V_pf_hashseed   VNET(pf_hashseed)
 373
 374 int
 375 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
 376 {
 377
 378         switch (af) {
 379 #ifdef INET
 380         case AF_INET:
 381                 if (a->addr32[0] > b->addr32[0])
 382                         return (1);
 383                 if (a->addr32[0] < b->addr32[0])
 384                         return (-1);
 385                 break;
 386 #endif /* INET */
 387 #ifdef INET6
 388         case AF_INET6:
 389                 if (a->addr32[3] > b->addr32[3])
 390                         return (1);
 391                 if (a->addr32[3] < b->addr32[3])
 392                         return (-1);
 393                 if (a->addr32[2] > b->addr32[2])
 394                         return (1);
 395                 if (a->addr32[2] < b->addr32[2])
 396                         return (-1);
 397                 if (a->addr32[1] > b->addr32[1])
 398                         return (1);
 399                 if (a->addr32[1] < b->addr32[1])
 400                         return (-1);
 401                 if (a->addr32[0] > b->addr32[0])
 402                         return (1);
 403                 if (a->addr32[0] < b->addr32[0])
 404                         return (-1);
 405                 break;
 406 #endif /* INET6 */
 407         default:
 408                 panic("%s: unknown address family %u", __func__, af);
 409         }
 410         return (0);
 411 }
 412
 413 static __inline uint32_t
 414 pf_hashkey(struct pf_state_key *sk)
 415 {
 416         uint32_t h;
 417
 418         h = murmur3_32_hash32((uint32_t *)sk,
 419             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 420             V_pf_hashseed);
 421
 422         return (h & pf_hashmask);
 423 }
 424
 425 static __inline uint32_t
 426 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 427 {
 428         uint32_t h;
 429
 430         switch (af) {
 431         case AF_INET:
 432                 h = murmur3_32_hash32((uint32_t *)&addr->v4,
 433                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 434                 break;
 435         case AF_INET6:
 436                 h = murmur3_32_hash32((uint32_t *)&addr->v6,
 437                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 438                 break;
 439         default:
 440                 panic("%s: unknown address family %u", __func__, af);
 441         }
 442
 443         return (h & pf_srchashmask);
 444 }
 445
 446 #ifdef ALTQ
 447 static int
 448 pf_state_hash(struct pf_state *s)
 449 {
 450         u_int32_t hv = (intptr_t)s / sizeof(*s);
 451
 452         hv ^= crc32(&s->src, sizeof(s->src));
 453         hv ^= crc32(&s->dst, sizeof(s->dst));
 454         if (hv == 0)
 455                 hv = 1;
 456         return (hv);
 457 }
 458 #endif
 459
 460 #ifdef INET6
 461 void
 462 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 463 {
 464         switch (af) {
 465 #ifdef INET
 466         case AF_INET:
 467                 dst->addr32[0] = src->addr32[0];
 468                 break;
 469 #endif /* INET */
 470         case AF_INET6:
 471                 dst->addr32[0] = src->addr32[0];
 472                 dst->addr32[1] = src->addr32[1];
 473                 dst->addr32[2] = src->addr32[2];
 474                 dst->addr32[3] = src->addr32[3];
 475                 break;
 476         }
 477 }
 478 #endif /* INET6 */
 479
 480 static void
 481 pf_init_threshold(struct pf_threshold *threshold,
 482     u_int32_t limit, u_int32_t seconds)
 483 {
 484         threshold->limit = limit * PF_THRESHOLD_MULT;
 485         threshold->seconds = seconds;
 486         threshold->count = 0;
 487         threshold->last = time_uptime;
 488 }
 489
 490 static void
 491 pf_add_threshold(struct pf_threshold *threshold)
 492 {
 493         u_int32_t t = time_uptime, diff = t - threshold->last;
 494
 495         if (diff >= threshold->seconds)
 496                 threshold->count = 0;
 497         else
 498                 threshold->count -= threshold->count * diff /
 499                     threshold->seconds;
 500         threshold->count += PF_THRESHOLD_MULT;
 501         threshold->last = t;
 502 }
 503
 504 static int
 505 pf_check_threshold(struct pf_threshold *threshold)
 506 {
 507         return (threshold->count > threshold->limit);
 508 }
 509
 510 static int
 511 pf_src_connlimit(struct pf_state **state)
 512 {
 513         struct pf_overload_entry *pfoe;
 514         int bad = 0;
 515
 516         PF_STATE_LOCK_ASSERT(*state);
 517
 518         (*state)->src_node->conn++;
 519         (*state)->src.tcp_est = 1;
 520         pf_add_threshold(&(*state)->src_node->conn_rate);
 521
 522         if ((*state)->rule.ptr->max_src_conn &&
 523             (*state)->rule.ptr->max_src_conn <
 524             (*state)->src_node->conn) {
 525                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
 526                 bad++;
 527         }
 528
 529         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 530             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 531                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
 532                 bad++;
 533         }
 534
 535         if (!bad)
 536                 return (0);
 537
 538         /* Kill this state. */
 539         (*state)->timeout = PFTM_PURGE;
 540         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 541
 542         if ((*state)->rule.ptr->overload_tbl == NULL)
 543                 return (1);
 544
 545         /* Schedule overloading and flushing task. */
 546         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 547         if (pfoe == NULL)
 548                 return (1);     /* too bad :( */
 549
 550         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 551         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 552         pfoe->rule = (*state)->rule.ptr;
 553         pfoe->dir = (*state)->direction;
 554         PF_OVERLOADQ_LOCK();
 555         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 556         PF_OVERLOADQ_UNLOCK();
 557         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 558
 559         return (1);
 560 }
 561
 562 static void
 563 pf_overload_task(void *v, int pending)
 564 {
 565         struct pf_overload_head queue;
 566         struct pfr_addr p;
 567         struct pf_overload_entry *pfoe, *pfoe1;
 568         uint32_t killed = 0;
 569
 570         CURVNET_SET((struct vnet *)v);
 571
 572         PF_OVERLOADQ_LOCK();
 573         queue = V_pf_overloadqueue;
 574         SLIST_INIT(&V_pf_overloadqueue);
 575         PF_OVERLOADQ_UNLOCK();
 576
 577         bzero(&p, sizeof(p));
 578         SLIST_FOREACH(pfoe, &queue, next) {
 579                 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
 580                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 581                         printf("%s: blocking address ", __func__);
 582                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 583                         printf("\n");
 584                 }
 585
 586                 p.pfra_af = pfoe->af;
 587                 switch (pfoe->af) {
 588 #ifdef INET
 589                 case AF_INET:
 590                         p.pfra_net = 32;
 591                         p.pfra_ip4addr = pfoe->addr.v4;
 592                         break;
 593 #endif
 594 #ifdef INET6
 595                 case AF_INET6:
 596                         p.pfra_net = 128;
 597                         p.pfra_ip6addr = pfoe->addr.v6;
 598                         break;
 599 #endif
 600                 }
 601
 602                 PF_RULES_WLOCK();
 603                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 604                 PF_RULES_WUNLOCK();
 605         }
 606
 607         /*
 608          * Remove those entries, that don't need flushing.
 609          */
 610         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 611                 if (pfoe->rule->flush == 0) {
 612                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 613                         free(pfoe, M_PFTEMP);
 614                 } else
 615                         counter_u64_add(
 616                             V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
 617
 618         /* If nothing to flush, return. */
 619         if (SLIST_EMPTY(&queue)) {
 620                 CURVNET_RESTORE();
 621                 return;
 622         }
 623
 624         for (int i = 0; i <= pf_hashmask; i++) {
 625                 struct pf_idhash *ih = &V_pf_idhash[i];
 626                 struct pf_state_key *sk;
 627                 struct pf_state *s;
 628
 629                 PF_HASHROW_LOCK(ih);
 630                 LIST_FOREACH(s, &ih->states, entry) {
 631                     sk = s->key[PF_SK_WIRE];
 632                     SLIST_FOREACH(pfoe, &queue, next)
 633                         if (sk->af == pfoe->af &&
 634                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 635                             pfoe->rule == s->rule.ptr) &&
 636                             ((pfoe->dir == PF_OUT &&
 637                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 638                             (pfoe->dir == PF_IN &&
 639                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 640                                 s->timeout = PFTM_PURGE;
 641                                 s->src.state = s->dst.state = TCPS_CLOSED;
 642                                 killed++;
 643                         }
 644                 }
 645                 PF_HASHROW_UNLOCK(ih);
 646         }
 647         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 648                 free(pfoe, M_PFTEMP);
 649         if (V_pf_status.debug >= PF_DEBUG_MISC)
 650                 printf("%s: %u states killed", __func__, killed);
 651
 652         CURVNET_RESTORE();
 653 }
 654
 655 /*
 656  * Can return locked on failure, so that we can consistently
 657  * allocate and insert a new one.
 658  */
 659 struct pf_src_node *
 660 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
 661         int returnlocked)
 662 {
 663         struct pf_srchash *sh;
 664         struct pf_src_node *n;
 665
 666         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
 667
 668         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 669         PF_HASHROW_LOCK(sh);
 670         LIST_FOREACH(n, &sh->nodes, entry)
 671                 if (n->rule.ptr == rule && n->af == af &&
 672                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 673                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 674                         break;
 675         if (n != NULL) {
 676                 n->states++;
 677                 PF_HASHROW_UNLOCK(sh);
 678         } else if (returnlocked == 0)
 679                 PF_HASHROW_UNLOCK(sh);
 680
 681         return (n);
 682 }
 683
 684 static int
 685 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 686     struct pf_addr *src, sa_family_t af)
 687 {
 688
 689         KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
 690             rule->rpool.opts & PF_POOL_STICKYADDR),
 691             ("%s for non-tracking rule %p", __func__, rule));
 692
 693         if (*sn == NULL)
 694                 *sn = pf_find_src_node(src, rule, af, 1);
 695
 696         if (*sn == NULL) {
 697                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 698
 699                 PF_HASHROW_ASSERT(sh);
 700
 701                 if (!rule->max_src_nodes ||
 702                     counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
 703                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 704                 else
 705                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
 706                             1);
 707                 if ((*sn) == NULL) {
 708                         PF_HASHROW_UNLOCK(sh);
 709                         return (-1);
 710                 }
 711
 712                 pf_init_threshold(&(*sn)->conn_rate,
 713                     rule->max_src_conn_rate.limit,
 714                     rule->max_src_conn_rate.seconds);
 715
 716                 (*sn)->af = af;
 717                 (*sn)->rule.ptr = rule;
 718                 PF_ACPY(&(*sn)->addr, src, af);
 719                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 720                 (*sn)->creation = time_uptime;
 721                 (*sn)->ruletype = rule->action;
 722                 (*sn)->states = 1;
 723                 if ((*sn)->rule.ptr != NULL)
 724                         counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
 725                 PF_HASHROW_UNLOCK(sh);
 726                 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
 727         } else {
 728                 if (rule->max_src_states &&
 729                     (*sn)->states >= rule->max_src_states) {
 730                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
 731                             1);
 732                         return (-1);
 733                 }
 734         }
 735         return (0);
 736 }
 737
 738 void
 739 pf_unlink_src_node(struct pf_src_node *src)
 740 {
 741
 742         PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]);
 743         LIST_REMOVE(src, entry);
 744         if (src->rule.ptr)
 745                 counter_u64_add(src->rule.ptr->src_nodes, -1);
 746 }
 747
 748 u_int
 749 pf_free_src_nodes(struct pf_src_node_list *head)
 750 {
 751         struct pf_src_node *sn, *tmp;
 752         u_int count = 0;
 753
 754         LIST_FOREACH_SAFE(sn, head, entry, tmp) {
 755                 uma_zfree(V_pf_sources_z, sn);
 756                 count++;
 757         }
 758
 759         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
 760
 761         return (count);
 762 }
 763
 764 void
 765 pf_mtag_initialize()
 766 {
 767
 768         pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 769             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
 770             UMA_ALIGN_PTR, 0);
 771 }
 772
 773 /* Per-vnet data storage structures initialization. */
 774 void
 775 pf_initialize()
 776 {
 777         struct pf_keyhash       *kh;
 778         struct pf_idhash        *ih;
 779         struct pf_srchash       *sh;
 780         u_int i;
 781
 782         if (pf_hashsize == 0 || !powerof2(pf_hashsize))
 783                 pf_hashsize = PF_HASHSIZ;
 784         if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
 785                 pf_srchashsize = PF_HASHSIZ / 4;
 786
 787         V_pf_hashseed = arc4random();
 788
 789         /* States and state keys storage. */
 790         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
 791             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 792         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
 793         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
 794         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
 795
 796         V_pf_state_key_z = uma_zcreate("pf state keys",
 797             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
 798             UMA_ALIGN_PTR, 0);
 799         V_pf_keyhash = malloc(pf_hashsize * sizeof(struct pf_keyhash),
 800             M_PFHASH, M_WAITOK | M_ZERO);
 801         V_pf_idhash = malloc(pf_hashsize * sizeof(struct pf_idhash),
 802             M_PFHASH, M_WAITOK | M_ZERO);
 803         pf_hashmask = pf_hashsize - 1;
 804         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 805             i++, kh++, ih++) {
 806                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
 807                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
 808         }
 809
 810         /* Source nodes. */
 811         V_pf_sources_z = uma_zcreate("pf source nodes",
 812             sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
 813             0);
 814         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
 815         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
 816         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
 817         V_pf_srchash = malloc(pf_srchashsize * sizeof(struct pf_srchash),
 818           M_PFHASH, M_WAITOK|M_ZERO);
 819         pf_srchashmask = pf_srchashsize - 1;
 820         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
 821                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
 822
 823         /* ALTQ */
 824         TAILQ_INIT(&V_pf_altqs[0]);
 825         TAILQ_INIT(&V_pf_altqs[1]);
 826         TAILQ_INIT(&V_pf_pabuf);
 827         V_pf_altqs_active = &V_pf_altqs[0];
 828         V_pf_altqs_inactive = &V_pf_altqs[1];
 829
 830         /* Send & overload+flush queues. */
 831         STAILQ_INIT(&V_pf_sendqueue);
 832         SLIST_INIT(&V_pf_overloadqueue);
 833         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
 834
 835         /* Unlinked, but may be referenced rules. */
 836         TAILQ_INIT(&V_pf_unlinked_rules);
 837 }
 838
 839 void
 840 pf_mtag_cleanup()
 841 {
 842
 843         uma_zdestroy(pf_mtag_z);
 844 }
 845
 846 void
 847 pf_cleanup()
 848 {
 849         struct pf_keyhash       *kh;
 850         struct pf_idhash        *ih;
 851         struct pf_srchash       *sh;
 852         struct pf_send_entry    *pfse, *next;
 853         u_int i;
 854
 855         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 856             i++, kh++, ih++) {
 857                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
 858                     __func__));
 859                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
 860                     __func__));
 861                 mtx_destroy(&kh->lock);
 862                 mtx_destroy(&ih->lock);
 863         }
 864         free(V_pf_keyhash, M_PFHASH);
 865         free(V_pf_idhash, M_PFHASH);
 866
 867         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
 868                 KASSERT(LIST_EMPTY(&sh->nodes),
 869                     ("%s: source node hash not empty", __func__));
 870                 mtx_destroy(&sh->lock);
 871         }
 872         free(V_pf_srchash, M_PFHASH);
 873
 874         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
 875                 m_freem(pfse->pfse_m);
 876                 free(pfse, M_PFTEMP);
 877         }
 878
 879         uma_zdestroy(V_pf_sources_z);
 880         uma_zdestroy(V_pf_state_z);
 881         uma_zdestroy(V_pf_state_key_z);
 882 }
 883
 884 static int
 885 pf_mtag_uminit(void *mem, int size, int how)
 886 {
 887         struct m_tag *t;
 888
 889         t = (struct m_tag *)mem;
 890         t->m_tag_cookie = MTAG_ABI_COMPAT;
 891         t->m_tag_id = PACKET_TAG_PF;
 892         t->m_tag_len = sizeof(struct pf_mtag);
 893         t->m_tag_free = pf_mtag_free;
 894
 895         return (0);
 896 }
 897
 898 static void
 899 pf_mtag_free(struct m_tag *t)
 900 {
 901
 902         uma_zfree(pf_mtag_z, t);
 903 }
 904
 905 struct pf_mtag *
 906 pf_get_mtag(struct mbuf *m)
 907 {
 908         struct m_tag *mtag;
 909
 910         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 911                 return ((struct pf_mtag *)(mtag + 1));
 912
 913         mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
 914         if (mtag == NULL)
 915                 return (NULL);
 916         bzero(mtag + 1, sizeof(struct pf_mtag));
 917         m_tag_prepend(m, mtag);
 918
 919         return ((struct pf_mtag *)(mtag + 1));
 920 }
 921
 922 static int
 923 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
 924     struct pf_state *s)
 925 {
 926         struct pf_keyhash       *khs, *khw, *kh;
 927         struct pf_state_key     *sk, *cur;
 928         struct pf_state         *si, *olds = NULL;
 929         int idx;
 930
 931         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
 932         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
 933         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
 934
 935         /*
 936          * We need to lock hash slots of both keys. To avoid deadlock
 937          * we always lock the slot with lower address first. Unlock order
 938          * isn't important.
 939          *
 940          * We also need to lock ID hash slot before dropping key
 941          * locks. On success we return with ID hash slot locked.
 942          */
 943
 944         if (skw == sks) {
 945                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
 946                 PF_HASHROW_LOCK(khs);
 947         } else {
 948                 khs = &V_pf_keyhash[pf_hashkey(sks)];
 949                 khw = &V_pf_keyhash[pf_hashkey(skw)];
 950                 if (khs == khw) {
 951                         PF_HASHROW_LOCK(khs);
 952                 } else if (khs < khw) {
 953                         PF_HASHROW_LOCK(khs);
 954                         PF_HASHROW_LOCK(khw);
 955                 } else {
 956                         PF_HASHROW_LOCK(khw);
 957                         PF_HASHROW_LOCK(khs);
 958                 }
 959         }
 960
 961 #define KEYS_UNLOCK()   do {                    \
 962         if (khs != khw) {                       \
 963                 PF_HASHROW_UNLOCK(khs);         \
 964                 PF_HASHROW_UNLOCK(khw);         \
 965         } else                                  \
 966                 PF_HASHROW_UNLOCK(khs);         \
 967 } while (0)
 968
 969         /*
 970          * First run: start with wire key.
 971          */
 972         sk = skw;
 973         kh = khw;
 974         idx = PF_SK_WIRE;
 975
 976 keyattach:
 977         LIST_FOREACH(cur, &kh->keys, entry)
 978                 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
 979                         break;
 980
 981         if (cur != NULL) {
 982                 /* Key exists. Check for same kif, if none, add to key. */
 983                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
 984                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
 985
 986                         PF_HASHROW_LOCK(ih);
 987                         if (si->kif == s->kif &&
 988                             si->direction == s->direction) {
 989                                 if (sk->proto == IPPROTO_TCP &&
 990                                     si->src.state >= TCPS_FIN_WAIT_2 &&
 991                                     si->dst.state >= TCPS_FIN_WAIT_2) {
 992                                         /*
 993                                          * New state matches an old >FIN_WAIT_2
 994                                          * state. We can't drop key hash locks,
 995                                          * thus we can't unlink it properly.
 996                                          *
 997                                          * As a workaround we drop it into
 998                                          * TCPS_CLOSED state, schedule purge
 999                                          * ASAP and push it into the very end
1000                                          * of the slot TAILQ, so that it won't
1001                                          * conflict with our new state.
1002                                          */
1003                                         si->src.state = si->dst.state =
1004                                             TCPS_CLOSED;
1005                                         si->timeout = PFTM_PURGE;
1006                                         olds = si;
1007                                 } else {
1008                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
1009                                                 printf("pf: %s key attach "
1010                                                     "failed on %s: ",
1011                                                     (idx == PF_SK_WIRE) ?
1012                                                     "wire" : "stack",
1013                                                     s->kif->pfik_name);
1014                                                 pf_print_state_parts(s,
1015                                                     (idx == PF_SK_WIRE) ?
1016                                                     sk : NULL,
1017                                                     (idx == PF_SK_STACK) ?
1018                                                     sk : NULL);
1019                                                 printf(", existing: ");
1020                                                 pf_print_state_parts(si,
1021                                                     (idx == PF_SK_WIRE) ?
1022                                                     sk : NULL,
1023                                                     (idx == PF_SK_STACK) ?
1024                                                     sk : NULL);
1025                                                 printf("\n");
1026                                         }
1027                                         PF_HASHROW_UNLOCK(ih);
1028                                         KEYS_UNLOCK();
1029                                         uma_zfree(V_pf_state_key_z, sk);
1030                                         if (idx == PF_SK_STACK)
1031                                                 pf_detach_state(s);
1032                                         return (EEXIST); /* collision! */
1033                                 }
1034                         }
1035                         PF_HASHROW_UNLOCK(ih);
1036                 }
1037                 uma_zfree(V_pf_state_key_z, sk);
1038                 s->key[idx] = cur;
1039         } else {
1040                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1041                 s->key[idx] = sk;
1042         }
1043
1044 stateattach:
1045         /* List is sorted, if-bound states before floating. */
1046         if (s->kif == V_pfi_all)
1047                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1048         else
1049                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1050
1051         if (olds) {
1052                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1053                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1054                     key_list[idx]);
1055                 olds = NULL;
1056         }
1057
1058         /*
1059          * Attach done. See how should we (or should not?)
1060          * attach a second key.
1061          */
1062         if (sks == skw) {
1063                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1064                 idx = PF_SK_STACK;
1065                 sks = NULL;
1066                 goto stateattach;
1067         } else if (sks != NULL) {
1068                 /*
1069                  * Continue attaching with stack key.
1070                  */
1071                 sk = sks;
1072                 kh = khs;
1073                 idx = PF_SK_STACK;
1074                 sks = NULL;
1075                 goto keyattach;
1076         }
1077
1078         PF_STATE_LOCK(s);
1079         KEYS_UNLOCK();
1080
1081         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1082             ("%s failure", __func__));
1083
1084         return (0);
1085 #undef  KEYS_UNLOCK
1086 }
1087
1088 static void
1089 pf_detach_state(struct pf_state *s)
1090 {
1091         struct pf_state_key *sks = s->key[PF_SK_STACK];
1092         struct pf_keyhash *kh;
1093
1094         if (sks != NULL) {
1095                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1096                 PF_HASHROW_LOCK(kh);
1097                 if (s->key[PF_SK_STACK] != NULL)
1098                         pf_state_key_detach(s, PF_SK_STACK);
1099                 /*
1100                  * If both point to same key, then we are done.
1101                  */
1102                 if (sks == s->key[PF_SK_WIRE]) {
1103                         pf_state_key_detach(s, PF_SK_WIRE);
1104                         PF_HASHROW_UNLOCK(kh);
1105                         return;
1106                 }
1107                 PF_HASHROW_UNLOCK(kh);
1108         }
1109
1110         if (s->key[PF_SK_WIRE] != NULL) {
1111                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1112                 PF_HASHROW_LOCK(kh);
1113                 if (s->key[PF_SK_WIRE] != NULL)
1114                         pf_state_key_detach(s, PF_SK_WIRE);
1115                 PF_HASHROW_UNLOCK(kh);
1116         }
1117 }
1118
1119 static void
1120 pf_state_key_detach(struct pf_state *s, int idx)
1121 {
1122         struct pf_state_key *sk = s->key[idx];
1123 #ifdef INVARIANTS
1124         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1125
1126         PF_HASHROW_ASSERT(kh);
1127 #endif
1128         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1129         s->key[idx] = NULL;
1130
1131         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1132                 LIST_REMOVE(sk, entry);
1133                 uma_zfree(V_pf_state_key_z, sk);
1134         }
1135 }
1136
1137 static int
1138 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1139 {
1140         struct pf_state_key *sk = mem;
1141
1142         bzero(sk, sizeof(struct pf_state_key_cmp));
1143         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1144         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1145
1146         return (0);
1147 }
1148
1149 struct pf_state_key *
1150 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1151         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1152 {
1153         struct pf_state_key *sk;
1154
1155         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1156         if (sk == NULL)
1157                 return (NULL);
1158
1159         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1160         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1161         sk->port[pd->sidx] = sport;
1162         sk->port[pd->didx] = dport;
1163         sk->proto = pd->proto;
1164         sk->af = pd->af;
1165
1166         return (sk);
1167 }
1168
1169 struct pf_state_key *
1170 pf_state_key_clone(struct pf_state_key *orig)
1171 {
1172         struct pf_state_key *sk;
1173
1174         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1175         if (sk == NULL)
1176                 return (NULL);
1177
1178         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1179
1180         return (sk);
1181 }
1182
1183 int
1184 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1185     struct pf_state_key *sks, struct pf_state *s)
1186 {
1187         struct pf_idhash *ih;
1188         struct pf_state *cur;
1189         int error;
1190
1191         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1192             ("%s: sks not pristine", __func__));
1193         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1194             ("%s: skw not pristine", __func__));
1195         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1196
1197         s->kif = kif;
1198
1199         if (s->id == 0 && s->creatorid == 0) {
1200                 /* XXX: should be atomic, but probability of collision low */
1201                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1202                         V_pf_stateid[curcpu] = 1;
1203                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1204                 s->id = htobe64(s->id);
1205                 s->creatorid = V_pf_status.hostid;
1206         }
1207
1208         /* Returns with ID locked on success. */
1209         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1210                 return (error);
1211
1212         ih = &V_pf_idhash[PF_IDHASH(s)];
1213         PF_HASHROW_ASSERT(ih);
1214         LIST_FOREACH(cur, &ih->states, entry)
1215                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1216                         break;
1217
1218         if (cur != NULL) {
1219                 PF_HASHROW_UNLOCK(ih);
1220                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1221                         printf("pf: state ID collision: "
1222                             "id: %016llx creatorid: %08x\n",
1223                             (unsigned long long)be64toh(s->id),
1224                             ntohl(s->creatorid));
1225                 }
1226                 pf_detach_state(s);
1227                 return (EEXIST);
1228         }
1229         LIST_INSERT_HEAD(&ih->states, s, entry);
1230         /* One for keys, one for ID hash. */
1231         refcount_init(&s->refs, 2);
1232
1233         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1234         if (pfsync_insert_state_ptr != NULL)
1235                 pfsync_insert_state_ptr(s);
1236
1237         /* Returns locked. */
1238         return (0);
1239 }
1240
1241 /*
1242  * Find state by ID: returns with locked row on success.
1243  */
1244 struct pf_state *
1245 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1246 {
1247         struct pf_idhash *ih;
1248         struct pf_state *s;
1249
1250         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1251
1252         ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1253
1254         PF_HASHROW_LOCK(ih);
1255         LIST_FOREACH(s, &ih->states, entry)
1256                 if (s->id == id && s->creatorid == creatorid)
1257                         break;
1258
1259         if (s == NULL)
1260                 PF_HASHROW_UNLOCK(ih);
1261
1262         return (s);
1263 }
1264
1265 /*
1266  * Find state by key.
1267  * Returns with ID hash slot locked on success.
1268  */
1269 static struct pf_state *
1270 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1271 {
1272         struct pf_keyhash       *kh;
1273         struct pf_state_key     *sk;
1274         struct pf_state         *s;
1275         int idx;
1276
1277         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1278
1279         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1280
1281         PF_HASHROW_LOCK(kh);
1282         LIST_FOREACH(sk, &kh->keys, entry)
1283                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1284                         break;
1285         if (sk == NULL) {
1286                 PF_HASHROW_UNLOCK(kh);
1287                 return (NULL);
1288         }
1289
1290         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1291
1292         /* List is sorted, if-bound states before floating ones. */
1293         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1294                 if (s->kif == V_pfi_all || s->kif == kif) {
1295                         PF_STATE_LOCK(s);
1296                         PF_HASHROW_UNLOCK(kh);
1297                         if (s->timeout >= PFTM_MAX) {
1298                                 /*
1299                                  * State is either being processed by
1300                                  * pf_unlink_state() in an other thread, or
1301                                  * is scheduled for immediate expiry.
1302                                  */
1303                                 PF_STATE_UNLOCK(s);
1304                                 return (NULL);
1305                         }
1306                         return (s);
1307                 }
1308         PF_HASHROW_UNLOCK(kh);
1309
1310         return (NULL);
1311 }
1312
1313 struct pf_state *
1314 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1315 {
1316         struct pf_keyhash       *kh;
1317         struct pf_state_key     *sk;
1318         struct pf_state         *s, *ret = NULL;
1319         int                      idx, inout = 0;
1320
1321         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1322
1323         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1324
1325         PF_HASHROW_LOCK(kh);
1326         LIST_FOREACH(sk, &kh->keys, entry)
1327                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1328                         break;
1329         if (sk == NULL) {
1330                 PF_HASHROW_UNLOCK(kh);
1331                 return (NULL);
1332         }
1333         switch (dir) {
1334         case PF_IN:
1335                 idx = PF_SK_WIRE;
1336                 break;
1337         case PF_OUT:
1338                 idx = PF_SK_STACK;
1339                 break;
1340         case PF_INOUT:
1341                 idx = PF_SK_WIRE;
1342                 inout = 1;
1343                 break;
1344         default:
1345                 panic("%s: dir %u", __func__, dir);
1346         }
1347 second_run:
1348         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1349                 if (more == NULL) {
1350                         PF_HASHROW_UNLOCK(kh);
1351                         return (s);
1352                 }
1353
1354                 if (ret)
1355                         (*more)++;
1356                 else
1357                         ret = s;
1358         }
1359         if (inout == 1) {
1360                 inout = 0;
1361                 idx = PF_SK_STACK;
1362                 goto second_run;
1363         }
1364         PF_HASHROW_UNLOCK(kh);
1365
1366         return (ret);
1367 }
1368
1369 /* END state table stuff */
1370
1371 static void
1372 pf_send(struct pf_send_entry *pfse)
1373 {
1374
1375         PF_SENDQ_LOCK();
1376         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1377         PF_SENDQ_UNLOCK();
1378         swi_sched(V_pf_swi_cookie, 0);
1379 }
1380
1381 void
1382 pf_intr(void *v)
1383 {
1384         struct pf_send_head queue;
1385         struct pf_send_entry *pfse, *next;
1386
1387         CURVNET_SET((struct vnet *)v);
1388
1389         PF_SENDQ_LOCK();
1390         queue = V_pf_sendqueue;
1391         STAILQ_INIT(&V_pf_sendqueue);
1392         PF_SENDQ_UNLOCK();
1393
1394         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1395                 switch (pfse->pfse_type) {
1396 #ifdef INET
1397                 case PFSE_IP:
1398                         ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1399                         break;
1400                 case PFSE_ICMP:
1401                         icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1402                             pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1403                         break;
1404 #endif /* INET */
1405 #ifdef INET6
1406                 case PFSE_IP6:
1407                         ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1408                             NULL);
1409                         break;
1410                 case PFSE_ICMP6:
1411                         icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1412                             pfse->icmpopts.code, pfse->icmpopts.mtu);
1413                         break;
1414 #endif /* INET6 */
1415                 default:
1416                         panic("%s: unknown type", __func__);
1417                 }
1418                 free(pfse, M_PFTEMP);
1419         }
1420         CURVNET_RESTORE();
1421 }
1422
1423 void
1424 pf_purge_thread(void *unused __unused)
1425 {
1426         VNET_ITERATOR_DECL(vnet_iter);
1427         u_int idx = 0;
1428
1429         for (;;) {
1430                 PF_RULES_RLOCK();
1431                 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10);
1432                 PF_RULES_RUNLOCK();
1433
1434                 VNET_LIST_RLOCK();
1435                 VNET_FOREACH(vnet_iter) {
1436                         CURVNET_SET(vnet_iter);
1437
1438                 if (pf_end_threads) {
1439                         pf_end_threads++;
1440                         wakeup(pf_purge_thread);
1441                         kproc_exit(0);
1442                 }
1443
1444                 /* Process 1/interval fraction of the state table every run. */
1445                 idx = pf_purge_expired_states(idx, pf_hashmask /
1446                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1447
1448                 /* Purge other expired types every PFTM_INTERVAL seconds. */
1449                 if (idx == 0) {
1450                         /*
1451                          * Order is important:
1452                          * - states and src nodes reference rules
1453                          * - states and rules reference kifs
1454                          */
1455                         pf_purge_expired_fragments();
1456                         pf_purge_expired_src_nodes();
1457                         pf_purge_unlinked_rules();
1458                         pfi_kif_purge();
1459                 }
1460                 CURVNET_RESTORE();
1461                 }
1462                 VNET_LIST_RUNLOCK();
1463         }
1464         /* not reached */
1465 }
1466
1467 void
1468 pf_unload_vnet_purge(void)
1469 {
1470
1471         /*
1472          * To cleanse up all kifs and rules we need
1473          * two runs: first one clears reference flags,
1474          * then pf_purge_expired_states() doesn't
1475          * raise them, and then second run frees.
1476          */
1477         pf_purge_unlinked_rules();
1478         pfi_kif_purge();
1479
1480         /*
1481          * Now purge everything.
1482          */
1483         pf_purge_expired_states(0, pf_hashmask);
1484         pf_purge_expired_fragments();
1485         pf_purge_expired_src_nodes();
1486
1487         /*
1488          * Now all kifs & rules should be unreferenced,
1489          * thus should be successfully freed.
1490          */
1491         pf_purge_unlinked_rules();
1492         pfi_kif_purge();
1493 }
1494
1495
1496 u_int32_t
1497 pf_state_expires(const struct pf_state *state)
1498 {
1499         u_int32_t       timeout;
1500         u_int32_t       start;
1501         u_int32_t       end;
1502         u_int32_t       states;
1503
1504         /* handle all PFTM_* > PFTM_MAX here */
1505         if (state->timeout == PFTM_PURGE)
1506                 return (time_uptime);
1507         KASSERT(state->timeout != PFTM_UNLINKED,
1508             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1509         KASSERT((state->timeout < PFTM_MAX),
1510             ("pf_state_expires: timeout > PFTM_MAX"));
1511         timeout = state->rule.ptr->timeout[state->timeout];
1512         if (!timeout)
1513                 timeout = V_pf_default_rule.timeout[state->timeout];
1514         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1515         if (start) {
1516                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1517                 states = counter_u64_fetch(state->rule.ptr->states_cur);
1518         } else {
1519                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1520                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1521                 states = V_pf_status.states;
1522         }
1523         if (end && states > start && start < end) {
1524                 if (states < end)
1525                         return (state->expire + timeout * (end - states) /
1526                             (end - start));
1527                 else
1528                         return (time_uptime);
1529         }
1530         return (state->expire + timeout);
1531 }
1532
1533 void
1534 pf_purge_expired_src_nodes()
1535 {
1536         struct pf_src_node_list  freelist;
1537         struct pf_srchash       *sh;
1538         struct pf_src_node      *cur, *next;
1539         int i;
1540
1541         LIST_INIT(&freelist);
1542         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1543             PF_HASHROW_LOCK(sh);
1544             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1545                 if (cur->states == 0 && cur->expire <= time_uptime) {
1546                         pf_unlink_src_node(cur);
1547                         LIST_INSERT_HEAD(&freelist, cur, entry);
1548                 } else if (cur->rule.ptr != NULL)
1549                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1550             PF_HASHROW_UNLOCK(sh);
1551         }
1552
1553         pf_free_src_nodes(&freelist);
1554
1555         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1556 }
1557
1558 static void
1559 pf_src_tree_remove_state(struct pf_state *s)
1560 {
1561         struct pf_src_node *sn;
1562         struct pf_srchash *sh;
1563         uint32_t timeout;
1564
1565         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
1566             s->rule.ptr->timeout[PFTM_SRC_NODE] :
1567             V_pf_default_rule.timeout[PFTM_SRC_NODE];
1568
1569         if (s->src_node != NULL) {
1570                 sn = s->src_node;
1571                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1572                 PF_HASHROW_LOCK(sh);
1573                 if (s->src.tcp_est)
1574                         --sn->conn;
1575                 if (--sn->states == 0)
1576                         sn->expire = time_uptime + timeout;
1577                 PF_HASHROW_UNLOCK(sh);
1578         }
1579         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1580                 sn = s->nat_src_node;
1581                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1582                 PF_HASHROW_LOCK(sh);
1583                 if (--sn->states == 0)
1584                         sn->expire = time_uptime + timeout;
1585                 PF_HASHROW_UNLOCK(sh);
1586         }
1587         s->src_node = s->nat_src_node = NULL;
1588 }
1589
1590 /*
1591  * Unlink and potentilly free a state. Function may be
1592  * called with ID hash row locked, but always returns
1593  * unlocked, since it needs to go through key hash locking.
1594  */
1595 int
1596 pf_unlink_state(struct pf_state *s, u_int flags)
1597 {
1598         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1599
1600         if ((flags & PF_ENTER_LOCKED) == 0)
1601                 PF_HASHROW_LOCK(ih);
1602         else
1603                 PF_HASHROW_ASSERT(ih);
1604
1605         if (s->timeout == PFTM_UNLINKED) {
1606                 /*
1607                  * State is being processed
1608                  * by pf_unlink_state() in
1609                  * an other thread.
1610                  */
1611                 PF_HASHROW_UNLOCK(ih);
1612                 return (0);     /* XXXGL: undefined actually */
1613         }
1614
1615         if (s->src.state == PF_TCPS_PROXY_DST) {
1616                 /* XXX wire key the right one? */
1617                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1618                     &s->key[PF_SK_WIRE]->addr[1],
1619                     &s->key[PF_SK_WIRE]->addr[0],
1620                     s->key[PF_SK_WIRE]->port[1],
1621                     s->key[PF_SK_WIRE]->port[0],
1622                     s->src.seqhi, s->src.seqlo + 1,
1623                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1624         }
1625
1626         LIST_REMOVE(s, entry);
1627         pf_src_tree_remove_state(s);
1628
1629         if (pfsync_delete_state_ptr != NULL)
1630                 pfsync_delete_state_ptr(s);
1631
1632         STATE_DEC_COUNTERS(s);
1633
1634         s->timeout = PFTM_UNLINKED;
1635
1636         PF_HASHROW_UNLOCK(ih);
1637
1638         pf_detach_state(s);
1639         refcount_release(&s->refs);
1640
1641         return (pf_release_state(s));
1642 }
1643
1644 void
1645 pf_free_state(struct pf_state *cur)
1646 {
1647
1648         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1649         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1650             cur->timeout));
1651
1652         pf_normalize_tcp_cleanup(cur);
1653         uma_zfree(V_pf_state_z, cur);
1654         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1655 }
1656
1657 /*
1658  * Called only from pf_purge_thread(), thus serialized.
1659  */
1660 static u_int
1661 pf_purge_expired_states(u_int i, int maxcheck)
1662 {
1663         struct pf_idhash *ih;
1664         struct pf_state *s;
1665
1666         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1667
1668         /*
1669          * Go through hash and unlink states that expire now.
1670          */
1671         while (maxcheck > 0) {
1672
1673                 ih = &V_pf_idhash[i];
1674 relock:
1675                 PF_HASHROW_LOCK(ih);
1676                 LIST_FOREACH(s, &ih->states, entry) {
1677                         if (pf_state_expires(s) <= time_uptime) {
1678                                 V_pf_status.states -=
1679                                     pf_unlink_state(s, PF_ENTER_LOCKED);
1680                                 goto relock;
1681                         }
1682                         s->rule.ptr->rule_flag |= PFRULE_REFS;
1683                         if (s->nat_rule.ptr != NULL)
1684                                 s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1685                         if (s->anchor.ptr != NULL)
1686                                 s->anchor.ptr->rule_flag |= PFRULE_REFS;
1687                         s->kif->pfik_flags |= PFI_IFLAG_REFS;
1688                         if (s->rt_kif)
1689                                 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1690                 }
1691                 PF_HASHROW_UNLOCK(ih);
1692
1693                 /* Return when we hit end of hash. */
1694                 if (++i > pf_hashmask) {
1695                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1696                         return (0);
1697                 }
1698
1699                 maxcheck--;
1700         }
1701
1702         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1703
1704         return (i);
1705 }
1706
1707 static void
1708 pf_purge_unlinked_rules()
1709 {
1710         struct pf_rulequeue tmpq;
1711         struct pf_rule *r, *r1;
1712
1713         /*
1714          * If we have overloading task pending, then we'd
1715          * better skip purging this time. There is a tiny
1716          * probability that overloading task references
1717          * an already unlinked rule.
1718          */
1719         PF_OVERLOADQ_LOCK();
1720         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1721                 PF_OVERLOADQ_UNLOCK();
1722                 return;
1723         }
1724         PF_OVERLOADQ_UNLOCK();
1725
1726         /*
1727          * Do naive mark-and-sweep garbage collecting of old rules.
1728          * Reference flag is raised by pf_purge_expired_states()
1729          * and pf_purge_expired_src_nodes().
1730          *
1731          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1732          * use a temporary queue.
1733          */
1734         TAILQ_INIT(&tmpq);
1735         PF_UNLNKDRULES_LOCK();
1736         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1737                 if (!(r->rule_flag & PFRULE_REFS)) {
1738                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1739                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1740                 } else
1741                         r->rule_flag &= ~PFRULE_REFS;
1742         }
1743         PF_UNLNKDRULES_UNLOCK();
1744
1745         if (!TAILQ_EMPTY(&tmpq)) {
1746                 PF_RULES_WLOCK();
1747                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1748                         TAILQ_REMOVE(&tmpq, r, entries);
1749                         pf_free_rule(r);
1750                 }
1751                 PF_RULES_WUNLOCK();
1752         }
1753 }
1754
1755 void
1756 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1757 {
1758         switch (af) {
1759 #ifdef INET
1760         case AF_INET: {
1761                 u_int32_t a = ntohl(addr->addr32[0]);
1762                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1763                     (a>>8)&255, a&255);
1764                 if (p) {
1765                         p = ntohs(p);
1766                         printf(":%u", p);
1767                 }
1768                 break;
1769         }
1770 #endif /* INET */
1771 #ifdef INET6
1772         case AF_INET6: {
1773                 u_int16_t b;
1774                 u_int8_t i, curstart, curend, maxstart, maxend;
1775                 curstart = curend = maxstart = maxend = 255;
1776                 for (i = 0; i < 8; i++) {
1777                         if (!addr->addr16[i]) {
1778                                 if (curstart == 255)
1779                                         curstart = i;
1780                                 curend = i;
1781                         } else {
1782                                 if ((curend - curstart) >
1783                                     (maxend - maxstart)) {
1784                                         maxstart = curstart;
1785                                         maxend = curend;
1786                                 }
1787                                 curstart = curend = 255;
1788                         }
1789                 }
1790                 if ((curend - curstart) >
1791                     (maxend - maxstart)) {
1792                         maxstart = curstart;
1793                         maxend = curend;
1794                 }
1795                 for (i = 0; i < 8; i++) {
1796                         if (i >= maxstart && i <= maxend) {
1797                                 if (i == 0)
1798                                         printf(":");
1799                                 if (i == maxend)
1800                                         printf(":");
1801                         } else {
1802                                 b = ntohs(addr->addr16[i]);
1803                                 printf("%x", b);
1804                                 if (i < 7)
1805                                         printf(":");
1806                         }
1807                 }
1808                 if (p) {
1809                         p = ntohs(p);
1810                         printf("[%u]", p);
1811                 }
1812                 break;
1813         }
1814 #endif /* INET6 */
1815         }
1816 }
1817
1818 void
1819 pf_print_state(struct pf_state *s)
1820 {
1821         pf_print_state_parts(s, NULL, NULL);
1822 }
1823
1824 static void
1825 pf_print_state_parts(struct pf_state *s,
1826     struct pf_state_key *skwp, struct pf_state_key *sksp)
1827 {
1828         struct pf_state_key *skw, *sks;
1829         u_int8_t proto, dir;
1830
1831         /* Do our best to fill these, but they're skipped if NULL */
1832         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1833         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1834         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1835         dir = s ? s->direction : 0;
1836
1837         switch (proto) {
1838         case IPPROTO_IPV4:
1839                 printf("IPv4");
1840                 break;
1841         case IPPROTO_IPV6:
1842                 printf("IPv6");
1843                 break;
1844         case IPPROTO_TCP:
1845                 printf("TCP");
1846                 break;
1847         case IPPROTO_UDP:
1848                 printf("UDP");
1849                 break;
1850         case IPPROTO_ICMP:
1851                 printf("ICMP");
1852                 break;
1853         case IPPROTO_ICMPV6:
1854                 printf("ICMPv6");
1855                 break;
1856         default:
1857                 printf("%u", proto);
1858                 break;
1859         }
1860         switch (dir) {
1861         case PF_IN:
1862                 printf(" in");
1863                 break;
1864         case PF_OUT:
1865                 printf(" out");
1866                 break;
1867         }
1868         if (skw) {
1869                 printf(" wire: ");
1870                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1871                 printf(" ");
1872                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1873         }
1874         if (sks) {
1875                 printf(" stack: ");
1876                 if (sks != skw) {
1877                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1878                         printf(" ");
1879                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1880                 } else
1881                         printf("-");
1882         }
1883         if (s) {
1884                 if (proto == IPPROTO_TCP) {
1885                         printf(" [lo=%u high=%u win=%u modulator=%u",
1886                             s->src.seqlo, s->src.seqhi,
1887                             s->src.max_win, s->src.seqdiff);
1888                         if (s->src.wscale && s->dst.wscale)
1889                                 printf(" wscale=%u",
1890                                     s->src.wscale & PF_WSCALE_MASK);
1891                         printf("]");
1892                         printf(" [lo=%u high=%u win=%u modulator=%u",
1893                             s->dst.seqlo, s->dst.seqhi,
1894                             s->dst.max_win, s->dst.seqdiff);
1895                         if (s->src.wscale && s->dst.wscale)
1896                                 printf(" wscale=%u",
1897                                 s->dst.wscale & PF_WSCALE_MASK);
1898                         printf("]");
1899                 }
1900                 printf(" %u:%u", s->src.state, s->dst.state);
1901         }
1902 }
1903
1904 void
1905 pf_print_flags(u_int8_t f)
1906 {
1907         if (f)
1908                 printf(" ");
1909         if (f & TH_FIN)
1910                 printf("F");
1911         if (f & TH_SYN)
1912                 printf("S");
1913         if (f & TH_RST)
1914                 printf("R");
1915         if (f & TH_PUSH)
1916                 printf("P");
1917         if (f & TH_ACK)
1918                 printf("A");
1919         if (f & TH_URG)
1920                 printf("U");
1921         if (f & TH_ECE)
1922                 printf("E");
1923         if (f & TH_CWR)
1924                 printf("W");
1925 }
1926
1927 #define PF_SET_SKIP_STEPS(i)                                    \
1928         do {                                                    \
1929                 while (head[i] != cur) {                        \
1930                         head[i]->skip[i].ptr = cur;             \
1931                         head[i] = TAILQ_NEXT(head[i], entries); \
1932                 }                                               \
1933         } while (0)
1934
1935 void
1936 pf_calc_skip_steps(struct pf_rulequeue *rules)
1937 {
1938         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1939         int i;
1940
1941         cur = TAILQ_FIRST(rules);
1942         prev = cur;
1943         for (i = 0; i < PF_SKIP_COUNT; ++i)
1944                 head[i] = cur;
1945         while (cur != NULL) {
1946
1947                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1948                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1949                 if (cur->direction != prev->direction)
1950                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1951                 if (cur->af != prev->af)
1952                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1953                 if (cur->proto != prev->proto)
1954                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1955                 if (cur->src.neg != prev->src.neg ||
1956                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1957                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1958                 if (cur->src.port[0] != prev->src.port[0] ||
1959                     cur->src.port[1] != prev->src.port[1] ||
1960                     cur->src.port_op != prev->src.port_op)
1961                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1962                 if (cur->dst.neg != prev->dst.neg ||
1963                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1964                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1965                 if (cur->dst.port[0] != prev->dst.port[0] ||
1966                     cur->dst.port[1] != prev->dst.port[1] ||
1967                     cur->dst.port_op != prev->dst.port_op)
1968                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1969
1970                 prev = cur;
1971                 cur = TAILQ_NEXT(cur, entries);
1972         }
1973         for (i = 0; i < PF_SKIP_COUNT; ++i)
1974                 PF_SET_SKIP_STEPS(i);
1975 }
1976
1977 static int
1978 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1979 {
1980         if (aw1->type != aw2->type)
1981                 return (1);
1982         switch (aw1->type) {
1983         case PF_ADDR_ADDRMASK:
1984         case PF_ADDR_RANGE:
1985                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
1986                         return (1);
1987                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
1988                         return (1);
1989                 return (0);
1990         case PF_ADDR_DYNIFTL:
1991                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1992         case PF_ADDR_NOROUTE:
1993         case PF_ADDR_URPFFAILED:
1994                 return (0);
1995         case PF_ADDR_TABLE:
1996                 return (aw1->p.tbl != aw2->p.tbl);
1997         default:
1998                 printf("invalid address type: %d\n", aw1->type);
1999                 return (1);
2000         }
2001 }
2002
2003 /**
2004  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2005  * header isn't always a full checksum. In some cases (i.e. output) it's a
2006  * pseudo-header checksum, which is a partial checksum over src/dst IP
2007  * addresses, protocol number and length.
2008  *
2009  * That means we have the following cases:
2010  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2011  *      checksums, we need to update the checksum whenever we change anything.
2012  *  * Output (i.e. the checksum is a pseudo-header checksum):
2013  *      x The field being updated is src/dst address or affects the length of
2014  *      the packet. We need to update the pseudo-header checksum (note that this
2015  *      checksum is not ones' complement).
2016  *      x Some other field is being modified (e.g. src/dst port numbers): We
2017  *      don't have to update anything.
2018  **/
2019 u_int16_t
2020 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2021 {
2022         u_int32_t       l;
2023
2024         if (udp && !cksum)
2025                 return (0x0000);
2026         l = cksum + old - new;
2027         l = (l >> 16) + (l & 65535);
2028         l = l & 65535;
2029         if (udp && !l)
2030                 return (0xFFFF);
2031         return (l);
2032 }
2033
2034 u_int16_t
2035 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2036         u_int16_t new, u_int8_t udp)
2037 {
2038         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2039                 return (cksum);
2040
2041         return (pf_cksum_fixup(cksum, old, new, udp));
2042 }
2043
2044 static void
2045 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2046         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2047         sa_family_t af)
2048 {
2049         struct pf_addr  ao;
2050         u_int16_t       po = *p;
2051
2052         PF_ACPY(&ao, a, af);
2053         PF_ACPY(a, an, af);
2054
2055         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2056                 *pc = ~*pc;
2057
2058         *p = pn;
2059
2060         switch (af) {
2061 #ifdef INET
2062         case AF_INET:
2063                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2064                     ao.addr16[0], an->addr16[0], 0),
2065                     ao.addr16[1], an->addr16[1], 0);
2066                 *p = pn;
2067
2068                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2069                     ao.addr16[0], an->addr16[0], u),
2070                     ao.addr16[1], an->addr16[1], u);
2071
2072                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2073                 break;
2074 #endif /* INET */
2075 #ifdef INET6
2076         case AF_INET6:
2077                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2078                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2079                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2080                     ao.addr16[0], an->addr16[0], u),
2081                     ao.addr16[1], an->addr16[1], u),
2082                     ao.addr16[2], an->addr16[2], u),
2083                     ao.addr16[3], an->addr16[3], u),
2084                     ao.addr16[4], an->addr16[4], u),
2085                     ao.addr16[5], an->addr16[5], u),
2086                     ao.addr16[6], an->addr16[6], u),
2087                     ao.addr16[7], an->addr16[7], u);
2088
2089                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2090                 break;
2091 #endif /* INET6 */
2092         }
2093
2094         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2095             CSUM_DELAY_DATA_IPV6)) {
2096                 *pc = ~*pc;
2097                 if (! *pc)
2098                         *pc = 0xffff;
2099         }
2100 }
2101
2102 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2103 void
2104 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2105 {
2106         u_int32_t       ao;
2107
2108         memcpy(&ao, a, sizeof(ao));
2109         memcpy(a, &an, sizeof(u_int32_t));
2110         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2111             ao % 65536, an % 65536, u);
2112 }
2113
2114 void
2115 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2116 {
2117         u_int32_t       ao;
2118
2119         memcpy(&ao, a, sizeof(ao));
2120         memcpy(a, &an, sizeof(u_int32_t));
2121
2122         *c = pf_proto_cksum_fixup(m,
2123             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2124             ao % 65536, an % 65536, udp);
2125 }
2126
2127 #ifdef INET6
2128 static void
2129 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2130 {
2131         struct pf_addr  ao;
2132
2133         PF_ACPY(&ao, a, AF_INET6);
2134         PF_ACPY(a, an, AF_INET6);
2135
2136         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2137             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2138             pf_cksum_fixup(pf_cksum_fixup(*c,
2139             ao.addr16[0], an->addr16[0], u),
2140             ao.addr16[1], an->addr16[1], u),
2141             ao.addr16[2], an->addr16[2], u),
2142             ao.addr16[3], an->addr16[3], u),
2143             ao.addr16[4], an->addr16[4], u),
2144             ao.addr16[5], an->addr16[5], u),
2145             ao.addr16[6], an->addr16[6], u),
2146             ao.addr16[7], an->addr16[7], u);
2147 }
2148 #endif /* INET6 */
2149
2150 static void
2151 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2152     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2153     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2154 {
2155         struct pf_addr  oia, ooa;
2156
2157         PF_ACPY(&oia, ia, af);
2158         if (oa)
2159                 PF_ACPY(&ooa, oa, af);
2160
2161         /* Change inner protocol port, fix inner protocol checksum. */
2162         if (ip != NULL) {
2163                 u_int16_t       oip = *ip;
2164                 u_int32_t       opc;
2165
2166                 if (pc != NULL)
2167                         opc = *pc;
2168                 *ip = np;
2169                 if (pc != NULL)
2170                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2171                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2172                 if (pc != NULL)
2173                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2174         }
2175         /* Change inner ip address, fix inner ip and icmp checksums. */
2176         PF_ACPY(ia, na, af);
2177         switch (af) {
2178 #ifdef INET
2179         case AF_INET: {
2180                 u_int32_t        oh2c = *h2c;
2181
2182                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2183                     oia.addr16[0], ia->addr16[0], 0),
2184                     oia.addr16[1], ia->addr16[1], 0);
2185                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2186                     oia.addr16[0], ia->addr16[0], 0),
2187                     oia.addr16[1], ia->addr16[1], 0);
2188                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2189                 break;
2190         }
2191 #endif /* INET */
2192 #ifdef INET6
2193         case AF_INET6:
2194                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2195                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2196                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2197                     oia.addr16[0], ia->addr16[0], u),
2198                     oia.addr16[1], ia->addr16[1], u),
2199                     oia.addr16[2], ia->addr16[2], u),
2200                     oia.addr16[3], ia->addr16[3], u),
2201                     oia.addr16[4], ia->addr16[4], u),
2202                     oia.addr16[5], ia->addr16[5], u),
2203                     oia.addr16[6], ia->addr16[6], u),
2204                     oia.addr16[7], ia->addr16[7], u);
2205                 break;
2206 #endif /* INET6 */
2207         }
2208         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2209         if (oa) {
2210                 PF_ACPY(oa, na, af);
2211                 switch (af) {
2212 #ifdef INET
2213                 case AF_INET:
2214                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2215                             ooa.addr16[0], oa->addr16[0], 0),
2216                             ooa.addr16[1], oa->addr16[1], 0);
2217                         break;
2218 #endif /* INET */
2219 #ifdef INET6
2220                 case AF_INET6:
2221                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2222                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2223                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2224                             ooa.addr16[0], oa->addr16[0], u),
2225                             ooa.addr16[1], oa->addr16[1], u),
2226                             ooa.addr16[2], oa->addr16[2], u),
2227                             ooa.addr16[3], oa->addr16[3], u),
2228                             ooa.addr16[4], oa->addr16[4], u),
2229                             ooa.addr16[5], oa->addr16[5], u),
2230                             ooa.addr16[6], oa->addr16[6], u),
2231                             ooa.addr16[7], oa->addr16[7], u);
2232                         break;
2233 #endif /* INET6 */
2234                 }
2235         }
2236 }
2237
2238
2239 /*
2240  * Need to modulate the sequence numbers in the TCP SACK option
2241  * (credits to Krzysztof Pfaff for report and patch)
2242  */
2243 static int
2244 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2245     struct tcphdr *th, struct pf_state_peer *dst)
2246 {
2247         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2248         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2249         int copyback = 0, i, olen;
2250         struct sackblk sack;
2251
2252 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2253         if (hlen < TCPOLEN_SACKLEN ||
2254             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2255                 return 0;
2256
2257         while (hlen >= TCPOLEN_SACKLEN) {
2258                 olen = opt[1];
2259                 switch (*opt) {
2260                 case TCPOPT_EOL:        /* FALLTHROUGH */
2261                 case TCPOPT_NOP:
2262                         opt++;
2263                         hlen--;
2264                         break;
2265                 case TCPOPT_SACK:
2266                         if (olen > hlen)
2267                                 olen = hlen;
2268                         if (olen >= TCPOLEN_SACKLEN) {
2269                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2270                                     i += TCPOLEN_SACK) {
2271                                         memcpy(&sack, &opt[i], sizeof(sack));
2272                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2273                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2274                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2275                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2276                                         memcpy(&opt[i], &sack, sizeof(sack));
2277                                 }
2278                                 copyback = 1;
2279                         }
2280                         /* FALLTHROUGH */
2281                 default:
2282                         if (olen < 2)
2283                                 olen = 2;
2284                         hlen -= olen;
2285                         opt += olen;
2286                 }
2287         }
2288
2289         if (copyback)
2290                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2291         return (copyback);
2292 }
2293
2294 static void
2295 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2296     const struct pf_addr *saddr, const struct pf_addr *daddr,
2297     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2298     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2299     u_int16_t rtag, struct ifnet *ifp)
2300 {
2301         struct pf_send_entry *pfse;
2302         struct mbuf     *m;
2303         int              len, tlen;
2304 #ifdef INET
2305         struct ip       *h = NULL;
2306 #endif /* INET */
2307 #ifdef INET6
2308         struct ip6_hdr  *h6 = NULL;
2309 #endif /* INET6 */
2310         struct tcphdr   *th;
2311         char            *opt;
2312         struct pf_mtag  *pf_mtag;
2313
2314         len = 0;
2315         th = NULL;
2316
2317         /* maximum segment size tcp option */
2318         tlen = sizeof(struct tcphdr);
2319         if (mss)
2320                 tlen += 4;
2321
2322         switch (af) {
2323 #ifdef INET
2324         case AF_INET:
2325                 len = sizeof(struct ip) + tlen;
2326                 break;
2327 #endif /* INET */
2328 #ifdef INET6
2329         case AF_INET6:
2330                 len = sizeof(struct ip6_hdr) + tlen;
2331                 break;
2332 #endif /* INET6 */
2333         default:
2334                 panic("%s: unsupported af %d", __func__, af);
2335         }
2336
2337         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2338         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2339         if (pfse == NULL)
2340                 return;
2341         m = m_gethdr(M_NOWAIT, MT_DATA);
2342         if (m == NULL) {
2343                 free(pfse, M_PFTEMP);
2344                 return;
2345         }
2346 #ifdef MAC
2347         mac_netinet_firewall_send(m);
2348 #endif
2349         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2350                 free(pfse, M_PFTEMP);
2351                 m_freem(m);
2352                 return;
2353         }
2354         if (tag)
2355                 m->m_flags |= M_SKIP_FIREWALL;
2356         pf_mtag->tag = rtag;
2357
2358         if (r != NULL && r->rtableid >= 0)
2359                 M_SETFIB(m, r->rtableid);
2360
2361 #ifdef ALTQ
2362         if (r != NULL && r->qid) {
2363                 pf_mtag->qid = r->qid;
2364
2365                 /* add hints for ecn */
2366                 pf_mtag->hdr = mtod(m, struct ip *);
2367         }
2368 #endif /* ALTQ */
2369         m->m_data += max_linkhdr;
2370         m->m_pkthdr.len = m->m_len = len;
2371         m->m_pkthdr.rcvif = NULL;
2372         bzero(m->m_data, len);
2373         switch (af) {
2374 #ifdef INET
2375         case AF_INET:
2376                 h = mtod(m, struct ip *);
2377
2378                 /* IP header fields included in the TCP checksum */
2379                 h->ip_p = IPPROTO_TCP;
2380                 h->ip_len = htons(tlen);
2381                 h->ip_src.s_addr = saddr->v4.s_addr;
2382                 h->ip_dst.s_addr = daddr->v4.s_addr;
2383
2384                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2385                 break;
2386 #endif /* INET */
2387 #ifdef INET6
2388         case AF_INET6:
2389                 h6 = mtod(m, struct ip6_hdr *);
2390
2391                 /* IP header fields included in the TCP checksum */
2392                 h6->ip6_nxt = IPPROTO_TCP;
2393                 h6->ip6_plen = htons(tlen);
2394                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2395                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2396
2397                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2398                 break;
2399 #endif /* INET6 */
2400         }
2401
2402         /* TCP header */
2403         th->th_sport = sport;
2404         th->th_dport = dport;
2405         th->th_seq = htonl(seq);
2406         th->th_ack = htonl(ack);
2407         th->th_off = tlen >> 2;
2408         th->th_flags = flags;
2409         th->th_win = htons(win);
2410
2411         if (mss) {
2412                 opt = (char *)(th + 1);
2413                 opt[0] = TCPOPT_MAXSEG;
2414                 opt[1] = 4;
2415                 HTONS(mss);
2416                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2417         }
2418
2419         switch (af) {
2420 #ifdef INET
2421         case AF_INET:
2422                 /* TCP checksum */
2423                 th->th_sum = in_cksum(m, len);
2424
2425                 /* Finish the IP header */
2426                 h->ip_v = 4;
2427                 h->ip_hl = sizeof(*h) >> 2;
2428                 h->ip_tos = IPTOS_LOWDELAY;
2429                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2430                 h->ip_len = htons(len);
2431                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2432                 h->ip_sum = 0;
2433
2434                 pfse->pfse_type = PFSE_IP;
2435                 break;
2436 #endif /* INET */
2437 #ifdef INET6
2438         case AF_INET6:
2439                 /* TCP checksum */
2440                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2441                     sizeof(struct ip6_hdr), tlen);
2442
2443                 h6->ip6_vfc |= IPV6_VERSION;
2444                 h6->ip6_hlim = IPV6_DEFHLIM;
2445
2446                 pfse->pfse_type = PFSE_IP6;
2447                 break;
2448 #endif /* INET6 */
2449         }
2450         pfse->pfse_m = m;
2451         pf_send(pfse);
2452 }
2453
2454 static int
2455 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio)
2456 {
2457         struct m_tag *mtag;
2458
2459         KASSERT(prio <= PF_PRIO_MAX,
2460             ("%s with invalid pcp", __func__));
2461
2462         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
2463         if (mtag == NULL) {
2464                 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
2465                     sizeof(uint8_t), M_NOWAIT);
2466                 if (mtag == NULL)
2467                         return (ENOMEM);
2468                 m_tag_prepend(m, mtag);
2469         }
2470
2471         *(uint8_t *)(mtag + 1) = prio;
2472         return (0);
2473 }
2474
2475 static int
2476 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
2477 {
2478         struct m_tag *mtag;
2479         u_int8_t mpcp;
2480
2481         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
2482         if (mtag == NULL)
2483                 return (0);
2484
2485         if (prio == PF_PRIO_ZERO)
2486                 prio = 0;
2487
2488         mpcp = *(uint8_t *)(mtag + 1);
2489
2490         return (mpcp == prio);
2491 }
2492
2493 static void
2494 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2495     struct pf_rule *r)
2496 {
2497         struct pf_send_entry *pfse;
2498         struct mbuf *m0;
2499         struct pf_mtag *pf_mtag;
2500
2501         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2502         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2503         if (pfse == NULL)
2504                 return;
2505
2506         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2507                 free(pfse, M_PFTEMP);
2508                 return;
2509         }
2510
2511         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2512                 free(pfse, M_PFTEMP);
2513                 return;
2514         }
2515         /* XXX: revisit */
2516         m0->m_flags |= M_SKIP_FIREWALL;
2517
2518         if (r->rtableid >= 0)
2519                 M_SETFIB(m0, r->rtableid);
2520
2521 #ifdef ALTQ
2522         if (r->qid) {
2523                 pf_mtag->qid = r->qid;
2524                 /* add hints for ecn */
2525                 pf_mtag->hdr = mtod(m0, struct ip *);
2526         }
2527 #endif /* ALTQ */
2528
2529         switch (af) {
2530 #ifdef INET
2531         case AF_INET:
2532                 pfse->pfse_type = PFSE_ICMP;
2533                 break;
2534 #endif /* INET */
2535 #ifdef INET6
2536         case AF_INET6:
2537                 pfse->pfse_type = PFSE_ICMP6;
2538                 break;
2539 #endif /* INET6 */
2540         }
2541         pfse->pfse_m = m0;
2542         pfse->icmpopts.type = type;
2543         pfse->icmpopts.code = code;
2544         pf_send(pfse);
2545 }
2546
2547 /*
2548  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2549  * If n is 0, they match if they are equal. If n is != 0, they match if they
2550  * are different.
2551  */
2552 int
2553 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2554     struct pf_addr *b, sa_family_t af)
2555 {
2556         int     match = 0;
2557
2558         switch (af) {
2559 #ifdef INET
2560         case AF_INET:
2561                 if ((a->addr32[0] & m->addr32[0]) ==
2562                     (b->addr32[0] & m->addr32[0]))
2563                         match++;
2564                 break;
2565 #endif /* INET */
2566 #ifdef INET6
2567         case AF_INET6:
2568                 if (((a->addr32[0] & m->addr32[0]) ==
2569                      (b->addr32[0] & m->addr32[0])) &&
2570                     ((a->addr32[1] & m->addr32[1]) ==
2571                      (b->addr32[1] & m->addr32[1])) &&
2572                     ((a->addr32[2] & m->addr32[2]) ==
2573                      (b->addr32[2] & m->addr32[2])) &&
2574                     ((a->addr32[3] & m->addr32[3]) ==
2575                      (b->addr32[3] & m->addr32[3])))
2576                         match++;
2577                 break;
2578 #endif /* INET6 */
2579         }
2580         if (match) {
2581                 if (n)
2582                         return (0);
2583                 else
2584                         return (1);
2585         } else {
2586                 if (n)
2587                         return (1);
2588                 else
2589                         return (0);
2590         }
2591 }
2592
2593 /*
2594  * Return 1 if b <= a <= e, otherwise return 0.
2595  */
2596 int
2597 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2598     struct pf_addr *a, sa_family_t af)
2599 {
2600         switch (af) {
2601 #ifdef INET
2602         case AF_INET:
2603                 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
2604                     (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
2605                         return (0);
2606                 break;
2607 #endif /* INET */
2608 #ifdef INET6
2609         case AF_INET6: {
2610                 int     i;
2611
2612                 /* check a >= b */
2613                 for (i = 0; i < 4; ++i)
2614                         if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
2615                                 break;
2616                         else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
2617                                 return (0);
2618                 /* check a <= e */
2619                 for (i = 0; i < 4; ++i)
2620                         if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
2621                                 break;
2622                         else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
2623                                 return (0);
2624                 break;
2625         }
2626 #endif /* INET6 */
2627         }
2628         return (1);
2629 }
2630
2631 static int
2632 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2633 {
2634         switch (op) {
2635         case PF_OP_IRG:
2636                 return ((p > a1) && (p < a2));
2637         case PF_OP_XRG:
2638                 return ((p < a1) || (p > a2));
2639         case PF_OP_RRG:
2640                 return ((p >= a1) && (p <= a2));
2641         case PF_OP_EQ:
2642                 return (p == a1);
2643         case PF_OP_NE:
2644                 return (p != a1);
2645         case PF_OP_LT:
2646                 return (p < a1);
2647         case PF_OP_LE:
2648                 return (p <= a1);
2649         case PF_OP_GT:
2650                 return (p > a1);
2651         case PF_OP_GE:
2652                 return (p >= a1);
2653         }
2654         return (0); /* never reached */
2655 }
2656
2657 int
2658 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2659 {
2660         NTOHS(a1);
2661         NTOHS(a2);
2662         NTOHS(p);
2663         return (pf_match(op, a1, a2, p));
2664 }
2665
2666 static int
2667 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2668 {
2669         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2670                 return (0);
2671         return (pf_match(op, a1, a2, u));
2672 }
2673
2674 static int
2675 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2676 {
2677         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2678                 return (0);
2679         return (pf_match(op, a1, a2, g));
2680 }
2681
2682 int
2683 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2684 {
2685         if (*tag == -1)
2686                 *tag = mtag;
2687
2688         return ((!r->match_tag_not && r->match_tag == *tag) ||
2689             (r->match_tag_not && r->match_tag != *tag));
2690 }
2691
2692 int
2693 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2694 {
2695
2696         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2697
2698         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2699                 return (ENOMEM);
2700
2701         pd->pf_mtag->tag = tag;
2702
2703         return (0);
2704 }
2705
2706 #define PF_ANCHOR_STACKSIZE     32
2707 struct pf_anchor_stackframe {
2708         struct pf_ruleset       *rs;
2709         struct pf_rule          *r;     /* XXX: + match bit */
2710         struct pf_anchor        *child;
2711 };
2712
2713 /*
2714  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2715  */
2716 #define PF_ANCHORSTACK_MATCH    0x00000001
2717 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2718
2719 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2720 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2721                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2722 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2723                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2724 } while (0)
2725
2726 void
2727 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2728     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2729     int *match)
2730 {
2731         struct pf_anchor_stackframe     *f;
2732
2733         PF_RULES_RASSERT();
2734
2735         if (match)
2736                 *match = 0;
2737         if (*depth >= PF_ANCHOR_STACKSIZE) {
2738                 printf("%s: anchor stack overflow on %s\n",
2739                     __func__, (*r)->anchor->name);
2740                 *r = TAILQ_NEXT(*r, entries);
2741                 return;
2742         } else if (*depth == 0 && a != NULL)
2743                 *a = *r;
2744         f = stack + (*depth)++;
2745         f->rs = *rs;
2746         f->r = *r;
2747         if ((*r)->anchor_wildcard) {
2748                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2749
2750                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2751                         *r = NULL;
2752                         return;
2753                 }
2754                 *rs = &f->child->ruleset;
2755         } else {
2756                 f->child = NULL;
2757                 *rs = &(*r)->anchor->ruleset;
2758         }
2759         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2760 }
2761
2762 int
2763 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2764     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2765     int *match)
2766 {
2767         struct pf_anchor_stackframe     *f;
2768         struct pf_rule *fr;
2769         int quick = 0;
2770
2771         PF_RULES_RASSERT();
2772
2773         do {
2774                 if (*depth <= 0)
2775                         break;
2776                 f = stack + *depth - 1;
2777                 fr = PF_ANCHOR_RULE(f);
2778                 if (f->child != NULL) {
2779                         struct pf_anchor_node *parent;
2780
2781                         /*
2782                          * This block traverses through
2783                          * a wildcard anchor.
2784                          */
2785                         parent = &fr->anchor->children;
2786                         if (match != NULL && *match) {
2787                                 /*
2788                                  * If any of "*" matched, then
2789                                  * "foo/ *" matched, mark frame
2790                                  * appropriately.
2791                                  */
2792                                 PF_ANCHOR_SET_MATCH(f);
2793                                 *match = 0;
2794                         }
2795                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2796                         if (f->child != NULL) {
2797                                 *rs = &f->child->ruleset;
2798                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2799                                 if (*r == NULL)
2800                                         continue;
2801                                 else
2802                                         break;
2803                         }
2804                 }
2805                 (*depth)--;
2806                 if (*depth == 0 && a != NULL)
2807                         *a = NULL;
2808                 *rs = f->rs;
2809                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2810                         quick = fr->quick;
2811                 *r = TAILQ_NEXT(fr, entries);
2812         } while (*r == NULL);
2813
2814         return (quick);
2815 }
2816
2817 #ifdef INET6
2818 void
2819 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2820     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2821 {
2822         switch (af) {
2823 #ifdef INET
2824         case AF_INET:
2825                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2826                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2827                 break;
2828 #endif /* INET */
2829         case AF_INET6:
2830                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2831                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2832                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2833                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2834                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2835                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2836                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2837                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2838                 break;
2839         }
2840 }
2841
2842 void
2843 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2844 {
2845         switch (af) {
2846 #ifdef INET
2847         case AF_INET:
2848                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2849                 break;
2850 #endif /* INET */
2851         case AF_INET6:
2852                 if (addr->addr32[3] == 0xffffffff) {
2853                         addr->addr32[3] = 0;
2854                         if (addr->addr32[2] == 0xffffffff) {
2855                                 addr->addr32[2] = 0;
2856                                 if (addr->addr32[1] == 0xffffffff) {
2857                                         addr->addr32[1] = 0;
2858                                         addr->addr32[0] =
2859                                             htonl(ntohl(addr->addr32[0]) + 1);
2860                                 } else
2861                                         addr->addr32[1] =
2862                                             htonl(ntohl(addr->addr32[1]) + 1);
2863                         } else
2864                                 addr->addr32[2] =
2865                                     htonl(ntohl(addr->addr32[2]) + 1);
2866                 } else
2867                         addr->addr32[3] =
2868                             htonl(ntohl(addr->addr32[3]) + 1);
2869                 break;
2870         }
2871 }
2872 #endif /* INET6 */
2873
2874 int
2875 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
2876 {
2877         struct pf_addr          *saddr, *daddr;
2878         u_int16_t                sport, dport;
2879         struct inpcbinfo        *pi;
2880         struct inpcb            *inp;
2881
2882         pd->lookup.uid = UID_MAX;
2883         pd->lookup.gid = GID_MAX;
2884
2885         switch (pd->proto) {
2886         case IPPROTO_TCP:
2887                 if (pd->hdr.tcp == NULL)
2888                         return (-1);
2889                 sport = pd->hdr.tcp->th_sport;
2890                 dport = pd->hdr.tcp->th_dport;
2891                 pi = &V_tcbinfo;
2892                 break;
2893         case IPPROTO_UDP:
2894                 if (pd->hdr.udp == NULL)
2895                         return (-1);
2896                 sport = pd->hdr.udp->uh_sport;
2897                 dport = pd->hdr.udp->uh_dport;
2898                 pi = &V_udbinfo;
2899                 break;
2900         default:
2901                 return (-1);
2902         }
2903         if (direction == PF_IN) {
2904                 saddr = pd->src;
2905                 daddr = pd->dst;
2906         } else {
2907                 u_int16_t       p;
2908
2909                 p = sport;
2910                 sport = dport;
2911                 dport = p;
2912                 saddr = pd->dst;
2913                 daddr = pd->src;
2914         }
2915         switch (pd->af) {
2916 #ifdef INET
2917         case AF_INET:
2918                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
2919                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2920                 if (inp == NULL) {
2921                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
2922                            daddr->v4, dport, INPLOOKUP_WILDCARD |
2923                            INPLOOKUP_RLOCKPCB, NULL, m);
2924                         if (inp == NULL)
2925                                 return (-1);
2926                 }
2927                 break;
2928 #endif /* INET */
2929 #ifdef INET6
2930         case AF_INET6:
2931                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
2932                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2933                 if (inp == NULL) {
2934                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
2935                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
2936                             INPLOOKUP_RLOCKPCB, NULL, m);
2937                         if (inp == NULL)
2938                                 return (-1);
2939                 }
2940                 break;
2941 #endif /* INET6 */
2942
2943         default:
2944                 return (-1);
2945         }
2946         INP_RLOCK_ASSERT(inp);
2947         pd->lookup.uid = inp->inp_cred->cr_uid;
2948         pd->lookup.gid = inp->inp_cred->cr_groups[0];
2949         INP_RUNLOCK(inp);
2950
2951         return (1);
2952 }
2953
2954 static u_int8_t
2955 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2956 {
2957         int              hlen;
2958         u_int8_t         hdr[60];
2959         u_int8_t        *opt, optlen;
2960         u_int8_t         wscale = 0;
2961
2962         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2963         if (hlen <= sizeof(struct tcphdr))
2964                 return (0);
2965         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2966                 return (0);
2967         opt = hdr + sizeof(struct tcphdr);
2968         hlen -= sizeof(struct tcphdr);
2969         while (hlen >= 3) {
2970                 switch (*opt) {
2971                 case TCPOPT_EOL:
2972                 case TCPOPT_NOP:
2973                         ++opt;
2974                         --hlen;
2975                         break;
2976                 case TCPOPT_WINDOW:
2977                         wscale = opt[2];
2978                         if (wscale > TCP_MAX_WINSHIFT)
2979                                 wscale = TCP_MAX_WINSHIFT;
2980                         wscale |= PF_WSCALE_FLAG;
2981                         /* FALLTHROUGH */
2982                 default:
2983                         optlen = opt[1];
2984                         if (optlen < 2)
2985                                 optlen = 2;
2986                         hlen -= optlen;
2987                         opt += optlen;
2988                         break;
2989                 }
2990         }
2991         return (wscale);
2992 }
2993
2994 static u_int16_t
2995 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2996 {
2997         int              hlen;
2998         u_int8_t         hdr[60];
2999         u_int8_t        *opt, optlen;
3000         u_int16_t        mss = V_tcp_mssdflt;
3001
3002         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3003         if (hlen <= sizeof(struct tcphdr))
3004                 return (0);
3005         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3006                 return (0);
3007         opt = hdr + sizeof(struct tcphdr);
3008         hlen -= sizeof(struct tcphdr);
3009         while (hlen >= TCPOLEN_MAXSEG) {
3010                 switch (*opt) {
3011                 case TCPOPT_EOL:
3012                 case TCPOPT_NOP:
3013                         ++opt;
3014                         --hlen;
3015                         break;
3016                 case TCPOPT_MAXSEG:
3017                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3018                         NTOHS(mss);
3019                         /* FALLTHROUGH */
3020                 default:
3021                         optlen = opt[1];
3022                         if (optlen < 2)
3023                                 optlen = 2;
3024                         hlen -= optlen;
3025                         opt += optlen;
3026                         break;
3027                 }
3028         }
3029         return (mss);
3030 }
3031
3032 static u_int16_t
3033 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3034 {
3035 #ifdef INET
3036         struct nhop4_basic      nh4;
3037 #endif /* INET */
3038 #ifdef INET6
3039         struct nhop6_basic      nh6;
3040         struct in6_addr         dst6;
3041         uint32_t                scopeid;
3042 #endif /* INET6 */
3043         int                      hlen = 0;
3044         uint16_t                 mss = 0;
3045
3046         switch (af) {
3047 #ifdef INET
3048         case AF_INET:
3049                 hlen = sizeof(struct ip);
3050                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
3051                         mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
3052                 break;
3053 #endif /* INET */
3054 #ifdef INET6
3055         case AF_INET6:
3056                 hlen = sizeof(struct ip6_hdr);
3057                 in6_splitscope(&addr->v6, &dst6, &scopeid);
3058                 if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
3059                         mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
3060                 break;
3061 #endif /* INET6 */
3062         }
3063
3064         mss = max(V_tcp_mssdflt, mss);
3065         mss = min(mss, offer);
3066         mss = max(mss, 64);             /* sanity - at least max opt space */
3067         return (mss);
3068 }
3069
3070 static u_int32_t
3071 pf_tcp_iss(struct pf_pdesc *pd)
3072 {
3073         MD5_CTX ctx;
3074         u_int32_t digest[4];
3075
3076         if (V_pf_tcp_secret_init == 0) {
3077                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3078                 MD5Init(&V_pf_tcp_secret_ctx);
3079                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3080                     sizeof(V_pf_tcp_secret));
3081                 V_pf_tcp_secret_init = 1;
3082         }
3083
3084         ctx = V_pf_tcp_secret_ctx;
3085
3086         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3087         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3088         if (pd->af == AF_INET6) {
3089                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3090                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3091         } else {
3092                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3093                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3094         }
3095         MD5Final((u_char *)digest, &ctx);
3096         V_pf_tcp_iss_off += 4096;
3097 #define ISN_RANDOM_INCREMENT (4096 - 1)
3098         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3099             V_pf_tcp_iss_off);
3100 #undef  ISN_RANDOM_INCREMENT
3101 }
3102
3103 static int
3104 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3105     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3106     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3107 {
3108         struct pf_rule          *nr = NULL;
3109         struct pf_addr          * const saddr = pd->src;
3110         struct pf_addr          * const daddr = pd->dst;
3111         sa_family_t              af = pd->af;
3112         struct pf_rule          *r, *a = NULL;
3113         struct pf_ruleset       *ruleset = NULL;
3114         struct pf_src_node      *nsn = NULL;
3115         struct tcphdr           *th = pd->hdr.tcp;
3116         struct pf_state_key     *sk = NULL, *nk = NULL;
3117         u_short                  reason;
3118         int                      rewrite = 0, hdrlen = 0;
3119         int                      tag = -1, rtableid = -1;
3120         int                      asd = 0;
3121         int                      match = 0;
3122         int                      state_icmp = 0;
3123         u_int16_t                sport = 0, dport = 0;
3124         u_int16_t                bproto_sum = 0, bip_sum = 0;
3125         u_int8_t                 icmptype = 0, icmpcode = 0;
3126         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3127
3128         PF_RULES_RASSERT();
3129
3130         if (inp != NULL) {
3131                 INP_LOCK_ASSERT(inp);
3132                 pd->lookup.uid = inp->inp_cred->cr_uid;
3133                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3134                 pd->lookup.done = 1;
3135         }
3136
3137         switch (pd->proto) {
3138         case IPPROTO_TCP:
3139                 sport = th->th_sport;
3140                 dport = th->th_dport;
3141                 hdrlen = sizeof(*th);
3142                 break;
3143         case IPPROTO_UDP:
3144                 sport = pd->hdr.udp->uh_sport;
3145                 dport = pd->hdr.udp->uh_dport;
3146                 hdrlen = sizeof(*pd->hdr.udp);
3147                 break;
3148 #ifdef INET
3149         case IPPROTO_ICMP:
3150                 if (pd->af != AF_INET)
3151                         break;
3152                 sport = dport = pd->hdr.icmp->icmp_id;
3153                 hdrlen = sizeof(*pd->hdr.icmp);
3154                 icmptype = pd->hdr.icmp->icmp_type;
3155                 icmpcode = pd->hdr.icmp->icmp_code;
3156
3157                 if (icmptype == ICMP_UNREACH ||
3158                     icmptype == ICMP_SOURCEQUENCH ||
3159                     icmptype == ICMP_REDIRECT ||
3160                     icmptype == ICMP_TIMXCEED ||
3161                     icmptype == ICMP_PARAMPROB)
3162                         state_icmp++;
3163                 break;
3164 #endif /* INET */
3165 #ifdef INET6
3166         case IPPROTO_ICMPV6:
3167                 if (af != AF_INET6)
3168                         break;
3169                 sport = dport = pd->hdr.icmp6->icmp6_id;
3170                 hdrlen = sizeof(*pd->hdr.icmp6);
3171                 icmptype = pd->hdr.icmp6->icmp6_type;
3172                 icmpcode = pd->hdr.icmp6->icmp6_code;
3173
3174                 if (icmptype == ICMP6_DST_UNREACH ||
3175                     icmptype == ICMP6_PACKET_TOO_BIG ||
3176                     icmptype == ICMP6_TIME_EXCEEDED ||
3177                     icmptype == ICMP6_PARAM_PROB)
3178                         state_icmp++;
3179                 break;
3180 #endif /* INET6 */
3181         default:
3182                 sport = dport = hdrlen = 0;
3183                 break;
3184         }
3185
3186         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3187
3188         /* check packet for BINAT/NAT/RDR */
3189         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3190             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3191                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3192                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3193
3194                 if (pd->ip_sum)
3195                         bip_sum = *pd->ip_sum;
3196
3197                 switch (pd->proto) {
3198                 case IPPROTO_TCP:
3199                         bproto_sum = th->th_sum;
3200                         pd->proto_sum = &th->th_sum;
3201
3202                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3203                             nk->port[pd->sidx] != sport) {
3204                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3205                                     &th->th_sum, &nk->addr[pd->sidx],
3206                                     nk->port[pd->sidx], 0, af);
3207                                 pd->sport = &th->th_sport;
3208                                 sport = th->th_sport;
3209                         }
3210
3211                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3212                             nk->port[pd->didx] != dport) {
3213                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3214                                     &th->th_sum, &nk->addr[pd->didx],
3215                                     nk->port[pd->didx], 0, af);
3216                                 dport = th->th_dport;
3217                                 pd->dport = &th->th_dport;
3218                         }
3219                         rewrite++;
3220                         break;
3221                 case IPPROTO_UDP:
3222                         bproto_sum = pd->hdr.udp->uh_sum;
3223                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3224
3225                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3226                             nk->port[pd->sidx] != sport) {
3227                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3228                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3229                                     &nk->addr[pd->sidx],
3230                                     nk->port[pd->sidx], 1, af);
3231                                 sport = pd->hdr.udp->uh_sport;
3232                                 pd->sport = &pd->hdr.udp->uh_sport;
3233                         }
3234
3235                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3236                             nk->port[pd->didx] != dport) {
3237                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3238                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3239                                     &nk->addr[pd->didx],
3240                                     nk->port[pd->didx], 1, af);
3241                                 dport = pd->hdr.udp->uh_dport;
3242                                 pd->dport = &pd->hdr.udp->uh_dport;
3243                         }
3244                         rewrite++;
3245                         break;
3246 #ifdef INET
3247                 case IPPROTO_ICMP:
3248                         nk->port[0] = nk->port[1];
3249                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3250                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3251                                     nk->addr[pd->sidx].v4.s_addr, 0);
3252
3253                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3254                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3255                                     nk->addr[pd->didx].v4.s_addr, 0);
3256
3257                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3258                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3259                                     pd->hdr.icmp->icmp_cksum, sport,
3260                                     nk->port[1], 0);
3261                                 pd->hdr.icmp->icmp_id = nk->port[1];
3262                                 pd->sport = &pd->hdr.icmp->icmp_id;
3263                         }
3264                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3265                         break;
3266 #endif /* INET */
3267 #ifdef INET6
3268                 case IPPROTO_ICMPV6:
3269                         nk->port[0] = nk->port[1];
3270                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3271                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3272                                     &nk->addr[pd->sidx], 0);
3273
3274                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3275                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3276                                     &nk->addr[pd->didx], 0);
3277                         rewrite++;
3278                         break;
3279 #endif /* INET */
3280                 default:
3281                         switch (af) {
3282 #ifdef INET
3283                         case AF_INET:
3284                                 if (PF_ANEQ(saddr,
3285                                     &nk->addr[pd->sidx], AF_INET))
3286                                         pf_change_a(&saddr->v4.s_addr,
3287                                             pd->ip_sum,
3288                                             nk->addr[pd->sidx].v4.s_addr, 0);
3289
3290                                 if (PF_ANEQ(daddr,
3291                                     &nk->addr[pd->didx], AF_INET))
3292                                         pf_change_a(&daddr->v4.s_addr,
3293                                             pd->ip_sum,
3294                                             nk->addr[pd->didx].v4.s_addr, 0);
3295                                 break;
3296 #endif /* INET */
3297 #ifdef INET6
3298                         case AF_INET6:
3299                                 if (PF_ANEQ(saddr,
3300                                     &nk->addr[pd->sidx], AF_INET6))
3301                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3302
3303                                 if (PF_ANEQ(daddr,
3304                                     &nk->addr[pd->didx], AF_INET6))
3305                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3306                                 break;
3307 #endif /* INET */
3308                         }
3309                         break;
3310                 }
3311                 if (nr->natpass)
3312                         r = NULL;
3313                 pd->nat_rule = nr;
3314         }
3315
3316         while (r != NULL) {
3317                 r->evaluations++;
3318                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3319                         r = r->skip[PF_SKIP_IFP].ptr;
3320                 else if (r->direction && r->direction != direction)
3321                         r = r->skip[PF_SKIP_DIR].ptr;
3322                 else if (r->af && r->af != af)
3323                         r = r->skip[PF_SKIP_AF].ptr;
3324                 else if (r->proto && r->proto != pd->proto)
3325                         r = r->skip[PF_SKIP_PROTO].ptr;
3326                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3327                     r->src.neg, kif, M_GETFIB(m)))
3328                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3329                 /* tcp/udp only. port_op always 0 in other cases */
3330                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3331                     r->src.port[0], r->src.port[1], sport))
3332                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3333                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3334                     r->dst.neg, NULL, M_GETFIB(m)))
3335                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3336                 /* tcp/udp only. port_op always 0 in other cases */
3337                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3338                     r->dst.port[0], r->dst.port[1], dport))
3339                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3340                 /* icmp only. type always 0 in other cases */
3341                 else if (r->type && r->type != icmptype + 1)
3342                         r = TAILQ_NEXT(r, entries);
3343                 /* icmp only. type always 0 in other cases */
3344                 else if (r->code && r->code != icmpcode + 1)
3345                         r = TAILQ_NEXT(r, entries);
3346                 else if (r->tos && !(r->tos == pd->tos))
3347                         r = TAILQ_NEXT(r, entries);
3348                 else if (r->rule_flag & PFRULE_FRAGMENT)
3349                         r = TAILQ_NEXT(r, entries);
3350                 else if (pd->proto == IPPROTO_TCP &&
3351                     (r->flagset & th->th_flags) != r->flags)
3352                         r = TAILQ_NEXT(r, entries);
3353                 /* tcp/udp only. uid.op always 0 in other cases */
3354                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3355                     pf_socket_lookup(direction, pd, m), 1)) &&
3356                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3357                     pd->lookup.uid))
3358                         r = TAILQ_NEXT(r, entries);
3359                 /* tcp/udp only. gid.op always 0 in other cases */
3360                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3361                     pf_socket_lookup(direction, pd, m), 1)) &&
3362                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3363                     pd->lookup.gid))
3364                         r = TAILQ_NEXT(r, entries);
3365                 else if (r->prio &&
3366                     !pf_match_ieee8021q_pcp(r->prio, m))
3367                         r = TAILQ_NEXT(r, entries);
3368                 else if (r->prob &&
3369                     r->prob <= arc4random())
3370                         r = TAILQ_NEXT(r, entries);
3371                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3372                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3373                         r = TAILQ_NEXT(r, entries);
3374                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3375                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3376                     pf_osfp_fingerprint(pd, m, off, th),
3377                     r->os_fingerprint)))
3378                         r = TAILQ_NEXT(r, entries);
3379                 else {
3380                         if (r->tag)
3381                                 tag = r->tag;
3382                         if (r->rtableid >= 0)
3383                                 rtableid = r->rtableid;
3384                         if (r->anchor == NULL) {
3385                                 match = 1;
3386                                 *rm = r;
3387                                 *am = a;
3388                                 *rsm = ruleset;
3389                                 if ((*rm)->quick)
3390                                         break;
3391                                 r = TAILQ_NEXT(r, entries);
3392                         } else
3393                                 pf_step_into_anchor(anchor_stack, &asd,
3394                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3395                                     &match);
3396                 }
3397                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3398                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3399                         break;
3400         }
3401         r = *rm;
3402         a = *am;
3403         ruleset = *rsm;
3404
3405         REASON_SET(&reason, PFRES_MATCH);
3406
3407         if (r->log || (nr != NULL && nr->log)) {
3408                 if (rewrite)
3409                         m_copyback(m, off, hdrlen, pd->hdr.any);
3410                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3411                     ruleset, pd, 1);
3412         }
3413
3414         if ((r->action == PF_DROP) &&
3415             ((r->rule_flag & PFRULE_RETURNRST) ||
3416             (r->rule_flag & PFRULE_RETURNICMP) ||
3417             (r->rule_flag & PFRULE_RETURN))) {
3418                 /* undo NAT changes, if they have taken place */
3419                 if (nr != NULL) {
3420                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3421                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3422                         if (pd->sport)
3423                                 *pd->sport = sk->port[pd->sidx];
3424                         if (pd->dport)
3425                                 *pd->dport = sk->port[pd->didx];
3426                         if (pd->proto_sum)
3427                                 *pd->proto_sum = bproto_sum;
3428                         if (pd->ip_sum)
3429                                 *pd->ip_sum = bip_sum;
3430                         m_copyback(m, off, hdrlen, pd->hdr.any);
3431                 }
3432                 if (pd->proto == IPPROTO_TCP &&
3433                     ((r->rule_flag & PFRULE_RETURNRST) ||
3434                     (r->rule_flag & PFRULE_RETURN)) &&
3435                     !(th->th_flags & TH_RST)) {
3436                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3437                         int              len = 0;
3438 #ifdef INET
3439                         struct ip       *h4;
3440 #endif
3441 #ifdef INET6
3442                         struct ip6_hdr  *h6;
3443 #endif
3444
3445                         switch (af) {
3446 #ifdef INET
3447                         case AF_INET:
3448                                 h4 = mtod(m, struct ip *);
3449                                 len = ntohs(h4->ip_len) - off;
3450                                 break;
3451 #endif
3452 #ifdef INET6
3453                         case AF_INET6:
3454                                 h6 = mtod(m, struct ip6_hdr *);
3455                                 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3456                                 break;
3457 #endif
3458                         }
3459
3460                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3461                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3462                         else {
3463                                 if (th->th_flags & TH_SYN)
3464                                         ack++;
3465                                 if (th->th_flags & TH_FIN)
3466                                         ack++;
3467                                 pf_send_tcp(m, r, af, pd->dst,
3468                                     pd->src, th->th_dport, th->th_sport,
3469                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3470                                     r->return_ttl, 1, 0, kif->pfik_ifp);
3471                         }
3472                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3473                     r->return_icmp)
3474                         pf_send_icmp(m, r->return_icmp >> 8,
3475                             r->return_icmp & 255, af, r);
3476                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3477                     r->return_icmp6)
3478                         pf_send_icmp(m, r->return_icmp6 >> 8,
3479                             r->return_icmp6 & 255, af, r);
3480         }
3481
3482         if (r->action == PF_DROP)
3483                 goto cleanup;
3484
3485         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3486                 REASON_SET(&reason, PFRES_MEMORY);
3487                 goto cleanup;
3488         }
3489         if (rtableid >= 0)
3490                 M_SETFIB(m, rtableid);
3491
3492         if (!state_icmp && (r->keep_state || nr != NULL ||
3493             (pd->flags & PFDESC_TCP_NORM))) {
3494                 int action;
3495                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3496                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3497                     hdrlen);
3498                 if (action != PF_PASS)
3499                         return (action);
3500         } else {
3501                 if (sk != NULL)
3502                         uma_zfree(V_pf_state_key_z, sk);
3503                 if (nk != NULL)
3504                         uma_zfree(V_pf_state_key_z, nk);
3505         }
3506
3507         /* copy back packet headers if we performed NAT operations */
3508         if (rewrite)
3509                 m_copyback(m, off, hdrlen, pd->hdr.any);
3510
3511         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3512             direction == PF_OUT &&
3513             pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m))
3514                 /*
3515                  * We want the state created, but we dont
3516                  * want to send this in case a partner
3517                  * firewall has to know about it to allow
3518                  * replies through it.
3519                  */
3520                 return (PF_DEFER);
3521
3522         return (PF_PASS);
3523
3524 cleanup:
3525         if (sk != NULL)
3526                 uma_zfree(V_pf_state_key_z, sk);
3527         if (nk != NULL)
3528                 uma_zfree(V_pf_state_key_z, nk);
3529         return (PF_DROP);
3530 }
3531
3532 static int
3533 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3534     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3535     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3536     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3537     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3538 {
3539         struct pf_state         *s = NULL;
3540         struct pf_src_node      *sn = NULL;
3541         struct tcphdr           *th = pd->hdr.tcp;
3542         u_int16_t                mss = V_tcp_mssdflt;
3543         u_short                  reason;
3544
3545         /* check maximums */
3546         if (r->max_states &&
3547             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3548                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3549                 REASON_SET(&reason, PFRES_MAXSTATES);
3550                 return (PF_DROP);
3551         }
3552         /* src node for filter rule */
3553         if ((r->rule_flag & PFRULE_SRCTRACK ||
3554             r->rpool.opts & PF_POOL_STICKYADDR) &&
3555             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3556                 REASON_SET(&reason, PFRES_SRCLIMIT);
3557                 goto csfailed;
3558         }
3559         /* src node for translation rule */
3560         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3561             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3562                 REASON_SET(&reason, PFRES_SRCLIMIT);
3563                 goto csfailed;
3564         }
3565         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3566         if (s == NULL) {
3567                 REASON_SET(&reason, PFRES_MEMORY);
3568                 goto csfailed;
3569         }
3570         s->rule.ptr = r;
3571         s->nat_rule.ptr = nr;
3572         s->anchor.ptr = a;
3573         STATE_INC_COUNTERS(s);
3574         if (r->allow_opts)
3575                 s->state_flags |= PFSTATE_ALLOWOPTS;
3576         if (r->rule_flag & PFRULE_STATESLOPPY)
3577                 s->state_flags |= PFSTATE_SLOPPY;
3578         s->log = r->log & PF_LOG_ALL;
3579         s->sync_state = PFSYNC_S_NONE;
3580         if (nr != NULL)
3581                 s->log |= nr->log & PF_LOG_ALL;
3582         switch (pd->proto) {
3583         case IPPROTO_TCP:
3584                 s->src.seqlo = ntohl(th->th_seq);
3585                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3586                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3587                     r->keep_state == PF_STATE_MODULATE) {
3588                         /* Generate sequence number modulator */
3589                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3590                             0)
3591                                 s->src.seqdiff = 1;
3592                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3593                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3594                         *rewrite = 1;
3595                 } else
3596                         s->src.seqdiff = 0;
3597                 if (th->th_flags & TH_SYN) {
3598                         s->src.seqhi++;
3599                         s->src.wscale = pf_get_wscale(m, off,
3600                             th->th_off, pd->af);
3601                 }
3602                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3603                 if (s->src.wscale & PF_WSCALE_MASK) {
3604                         /* Remove scale factor from initial window */
3605                         int win = s->src.max_win;
3606                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3607                         s->src.max_win = (win - 1) >>
3608                             (s->src.wscale & PF_WSCALE_MASK);
3609                 }
3610                 if (th->th_flags & TH_FIN)
3611                         s->src.seqhi++;
3612                 s->dst.seqhi = 1;
3613                 s->dst.max_win = 1;
3614                 s->src.state = TCPS_SYN_SENT;
3615                 s->dst.state = TCPS_CLOSED;
3616                 s->timeout = PFTM_TCP_FIRST_PACKET;
3617                 break;
3618         case IPPROTO_UDP:
3619                 s->src.state = PFUDPS_SINGLE;
3620                 s->dst.state = PFUDPS_NO_TRAFFIC;
3621                 s->timeout = PFTM_UDP_FIRST_PACKET;
3622                 break;
3623         case IPPROTO_ICMP:
3624 #ifdef INET6
3625         case IPPROTO_ICMPV6:
3626 #endif
3627                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3628                 break;
3629         default:
3630                 s->src.state = PFOTHERS_SINGLE;
3631                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3632                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3633         }
3634
3635         if (r->rt && r->rt != PF_FASTROUTE) {
3636                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3637                         REASON_SET(&reason, PFRES_MAPFAILED);
3638                         pf_src_tree_remove_state(s);
3639                         STATE_DEC_COUNTERS(s);
3640                         uma_zfree(V_pf_state_z, s);
3641                         goto csfailed;
3642                 }
3643                 s->rt_kif = r->rpool.cur->kif;
3644         }
3645
3646         s->creation = time_uptime;
3647         s->expire = time_uptime;
3648
3649         if (sn != NULL)
3650                 s->src_node = sn;
3651         if (nsn != NULL) {
3652                 /* XXX We only modify one side for now. */
3653                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3654                 s->nat_src_node = nsn;
3655         }
3656         if (pd->proto == IPPROTO_TCP) {
3657                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3658                     off, pd, th, &s->src, &s->dst)) {
3659                         REASON_SET(&reason, PFRES_MEMORY);
3660                         pf_src_tree_remove_state(s);
3661                         STATE_DEC_COUNTERS(s);
3662                         uma_zfree(V_pf_state_z, s);
3663                         return (PF_DROP);
3664                 }
3665                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3666                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3667                     &s->src, &s->dst, rewrite)) {
3668                         /* This really shouldn't happen!!! */
3669                         DPFPRINTF(PF_DEBUG_URGENT,
3670                             ("pf_normalize_tcp_stateful failed on first pkt"));
3671                         pf_normalize_tcp_cleanup(s);
3672                         pf_src_tree_remove_state(s);
3673                         STATE_DEC_COUNTERS(s);
3674                         uma_zfree(V_pf_state_z, s);
3675                         return (PF_DROP);
3676                 }
3677         }
3678         s->direction = pd->dir;
3679
3680         /*
3681          * sk/nk could already been setup by pf_get_translation().
3682          */
3683         if (nr == NULL) {
3684                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3685                     __func__, nr, sk, nk));
3686                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3687                 if (sk == NULL)
3688                         goto csfailed;
3689                 nk = sk;
3690         } else
3691                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3692                     __func__, nr, sk, nk));
3693
3694         /* Swap sk/nk for PF_OUT. */
3695         if (pf_state_insert(BOUND_IFACE(r, kif),
3696             (pd->dir == PF_IN) ? sk : nk,
3697             (pd->dir == PF_IN) ? nk : sk, s)) {
3698                 if (pd->proto == IPPROTO_TCP)
3699                         pf_normalize_tcp_cleanup(s);
3700                 REASON_SET(&reason, PFRES_STATEINS);
3701                 pf_src_tree_remove_state(s);
3702                 STATE_DEC_COUNTERS(s);
3703                 uma_zfree(V_pf_state_z, s);
3704                 return (PF_DROP);
3705         } else
3706                 *sm = s;
3707
3708         if (tag > 0)
3709                 s->tag = tag;
3710         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3711             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3712                 s->src.state = PF_TCPS_PROXY_SRC;
3713                 /* undo NAT changes, if they have taken place */
3714                 if (nr != NULL) {
3715                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3716                         if (pd->dir == PF_OUT)
3717                                 skt = s->key[PF_SK_STACK];
3718                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3719                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3720                         if (pd->sport)
3721                                 *pd->sport = skt->port[pd->sidx];
3722                         if (pd->dport)
3723                                 *pd->dport = skt->port[pd->didx];
3724                         if (pd->proto_sum)
3725                                 *pd->proto_sum = bproto_sum;
3726                         if (pd->ip_sum)
3727                                 *pd->ip_sum = bip_sum;
3728                         m_copyback(m, off, hdrlen, pd->hdr.any);
3729                 }
3730                 s->src.seqhi = htonl(arc4random());
3731                 /* Find mss option */
3732                 int rtid = M_GETFIB(m);
3733                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3734                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3735                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3736                 s->src.mss = mss;
3737                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3738                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3739                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3740                 REASON_SET(&reason, PFRES_SYNPROXY);
3741                 return (PF_SYNPROXY_DROP);
3742         }
3743
3744         return (PF_PASS);
3745
3746 csfailed:
3747         if (sk != NULL)
3748                 uma_zfree(V_pf_state_key_z, sk);
3749         if (nk != NULL)
3750                 uma_zfree(V_pf_state_key_z, nk);
3751
3752         if (sn != NULL) {
3753                 struct pf_srchash *sh;
3754
3755                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
3756                 PF_HASHROW_LOCK(sh);
3757                 if (--sn->states == 0 && sn->expire == 0) {
3758                         pf_unlink_src_node(sn);
3759                         uma_zfree(V_pf_sources_z, sn);
3760                         counter_u64_add(
3761                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3762                 }
3763                 PF_HASHROW_UNLOCK(sh);
3764         }
3765
3766         if (nsn != sn && nsn != NULL) {
3767                 struct pf_srchash *sh;
3768
3769                 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
3770                 PF_HASHROW_LOCK(sh);
3771                 if (--nsn->states == 0 && nsn->expire == 0) {
3772                         pf_unlink_src_node(nsn);
3773                         uma_zfree(V_pf_sources_z, nsn);
3774                         counter_u64_add(
3775                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3776                 }
3777                 PF_HASHROW_UNLOCK(sh);
3778         }
3779
3780         return (PF_DROP);
3781 }
3782
3783 static int
3784 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3785     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3786     struct pf_ruleset **rsm)
3787 {
3788         struct pf_rule          *r, *a = NULL;
3789         struct pf_ruleset       *ruleset = NULL;
3790         sa_family_t              af = pd->af;
3791         u_short                  reason;
3792         int                      tag = -1;
3793         int                      asd = 0;
3794         int                      match = 0;
3795         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3796
3797         PF_RULES_RASSERT();
3798
3799         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3800         while (r != NULL) {
3801                 r->evaluations++;
3802                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3803                         r = r->skip[PF_SKIP_IFP].ptr;
3804                 else if (r->direction && r->direction != direction)
3805                         r = r->skip[PF_SKIP_DIR].ptr;
3806                 else if (r->af && r->af != af)
3807                         r = r->skip[PF_SKIP_AF].ptr;
3808                 else if (r->proto && r->proto != pd->proto)
3809                         r = r->skip[PF_SKIP_PROTO].ptr;
3810                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3811                     r->src.neg, kif, M_GETFIB(m)))
3812                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3813                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3814                     r->dst.neg, NULL, M_GETFIB(m)))
3815                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3816                 else if (r->tos && !(r->tos == pd->tos))
3817                         r = TAILQ_NEXT(r, entries);
3818                 else if (r->os_fingerprint != PF_OSFP_ANY)
3819                         r = TAILQ_NEXT(r, entries);
3820                 else if (pd->proto == IPPROTO_UDP &&
3821                     (r->src.port_op || r->dst.port_op))
3822                         r = TAILQ_NEXT(r, entries);
3823                 else if (pd->proto == IPPROTO_TCP &&
3824                     (r->src.port_op || r->dst.port_op || r->flagset))
3825                         r = TAILQ_NEXT(r, entries);
3826                 else if ((pd->proto == IPPROTO_ICMP ||
3827                     pd->proto == IPPROTO_ICMPV6) &&
3828                     (r->type || r->code))
3829                         r = TAILQ_NEXT(r, entries);
3830                 else if (r->prio &&
3831                     !pf_match_ieee8021q_pcp(r->prio, m))
3832                         r = TAILQ_NEXT(r, entries);
3833                 else if (r->prob && r->prob <=
3834                     (arc4random() % (UINT_MAX - 1) + 1))
3835                         r = TAILQ_NEXT(r, entries);
3836                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3837                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3838                         r = TAILQ_NEXT(r, entries);
3839                 else {
3840                         if (r->anchor == NULL) {
3841                                 match = 1;
3842                                 *rm = r;
3843                                 *am = a;
3844                                 *rsm = ruleset;
3845                                 if ((*rm)->quick)
3846                                         break;
3847                                 r = TAILQ_NEXT(r, entries);
3848                         } else
3849                                 pf_step_into_anchor(anchor_stack, &asd,
3850                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3851                                     &match);
3852                 }
3853                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3854                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3855                         break;
3856         }
3857         r = *rm;
3858         a = *am;
3859         ruleset = *rsm;
3860
3861         REASON_SET(&reason, PFRES_MATCH);
3862
3863         if (r->log)
3864                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3865                     1);
3866
3867         if (r->action != PF_PASS)
3868                 return (PF_DROP);
3869
3870         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3871                 REASON_SET(&reason, PFRES_MEMORY);
3872                 return (PF_DROP);
3873         }
3874
3875         return (PF_PASS);
3876 }
3877
3878 static int
3879 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3880         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3881         struct pf_pdesc *pd, u_short *reason, int *copyback)
3882 {
3883         struct tcphdr           *th = pd->hdr.tcp;
3884         u_int16_t                win = ntohs(th->th_win);
3885         u_int32_t                ack, end, seq, orig_seq;
3886         u_int8_t                 sws, dws;
3887         int                      ackskew;
3888
3889         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3890                 sws = src->wscale & PF_WSCALE_MASK;
3891                 dws = dst->wscale & PF_WSCALE_MASK;
3892         } else
3893                 sws = dws = 0;
3894
3895         /*
3896          * Sequence tracking algorithm from Guido van Rooij's paper:
3897          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3898          *      tcp_filtering.ps
3899          */
3900
3901         orig_seq = seq = ntohl(th->th_seq);
3902         if (src->seqlo == 0) {
3903                 /* First packet from this end. Set its state */
3904
3905                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3906                     src->scrub == NULL) {
3907                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3908                                 REASON_SET(reason, PFRES_MEMORY);
3909                                 return (PF_DROP);
3910                         }
3911                 }
3912
3913                 /* Deferred generation of sequence number modulator */
3914                 if (dst->seqdiff && !src->seqdiff) {
3915                         /* use random iss for the TCP server */
3916                         while ((src->seqdiff = arc4random() - seq) == 0)
3917                                 ;
3918                         ack = ntohl(th->th_ack) - dst->seqdiff;
3919                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3920                             src->seqdiff), 0);
3921                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3922                         *copyback = 1;
3923                 } else {
3924                         ack = ntohl(th->th_ack);
3925                 }
3926
3927                 end = seq + pd->p_len;
3928                 if (th->th_flags & TH_SYN) {
3929                         end++;
3930                         if (dst->wscale & PF_WSCALE_FLAG) {
3931                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3932                                     pd->af);
3933                                 if (src->wscale & PF_WSCALE_FLAG) {
3934                                         /* Remove scale factor from initial
3935                                          * window */
3936                                         sws = src->wscale & PF_WSCALE_MASK;
3937                                         win = ((u_int32_t)win + (1 << sws) - 1)
3938                                             >> sws;
3939                                         dws = dst->wscale & PF_WSCALE_MASK;
3940                                 } else {
3941                                         /* fixup other window */
3942                                         dst->max_win <<= dst->wscale &
3943                                             PF_WSCALE_MASK;
3944                                         /* in case of a retrans SYN|ACK */
3945                                         dst->wscale = 0;
3946                                 }
3947                         }
3948                 }
3949                 if (th->th_flags & TH_FIN)
3950                         end++;
3951
3952                 src->seqlo = seq;
3953                 if (src->state < TCPS_SYN_SENT)
3954                         src->state = TCPS_SYN_SENT;
3955
3956                 /*
3957                  * May need to slide the window (seqhi may have been set by
3958                  * the crappy stack check or if we picked up the connection
3959                  * after establishment)
3960                  */
3961                 if (src->seqhi == 1 ||
3962                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3963                         src->seqhi = end + MAX(1, dst->max_win << dws);
3964                 if (win > src->max_win)
3965                         src->max_win = win;
3966
3967         } else {
3968                 ack = ntohl(th->th_ack) - dst->seqdiff;
3969                 if (src->seqdiff) {
3970                         /* Modulate sequence numbers */
3971                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3972                             src->seqdiff), 0);
3973                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3974                         *copyback = 1;
3975                 }
3976                 end = seq + pd->p_len;
3977                 if (th->th_flags & TH_SYN)
3978                         end++;
3979                 if (th->th_flags & TH_FIN)
3980                         end++;
3981         }
3982
3983         if ((th->th_flags & TH_ACK) == 0) {
3984                 /* Let it pass through the ack skew check */
3985                 ack = dst->seqlo;
3986         } else if ((ack == 0 &&
3987             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3988             /* broken tcp stacks do not set ack */
3989             (dst->state < TCPS_SYN_SENT)) {
3990                 /*
3991                  * Many stacks (ours included) will set the ACK number in an
3992                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3993                  */
3994                 ack = dst->seqlo;
3995         }
3996
3997         if (seq == end) {
3998                 /* Ease sequencing restrictions on no data packets */
3999                 seq = src->seqlo;
4000                 end = seq;
4001         }
4002
4003         ackskew = dst->seqlo - ack;
4004
4005
4006         /*
4007          * Need to demodulate the sequence numbers in any TCP SACK options
4008          * (Selective ACK). We could optionally validate the SACK values
4009          * against the current ACK window, either forwards or backwards, but
4010          * I'm not confident that SACK has been implemented properly
4011          * everywhere. It wouldn't surprise me if several stacks accidentally
4012          * SACK too far backwards of previously ACKed data. There really aren't
4013          * any security implications of bad SACKing unless the target stack
4014          * doesn't validate the option length correctly. Someone trying to
4015          * spoof into a TCP connection won't bother blindly sending SACK
4016          * options anyway.
4017          */
4018         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4019                 if (pf_modulate_sack(m, off, pd, th, dst))
4020                         *copyback = 1;
4021         }
4022
4023
4024 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4025         if (SEQ_GEQ(src->seqhi, end) &&
4026             /* Last octet inside other's window space */
4027             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4028             /* Retrans: not more than one window back */
4029             (ackskew >= -MAXACKWINDOW) &&
4030             /* Acking not more than one reassembled fragment backwards */
4031             (ackskew <= (MAXACKWINDOW << sws)) &&
4032             /* Acking not more than one window forward */
4033             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4034             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4035             (pd->flags & PFDESC_IP_REAS) == 0)) {
4036             /* Require an exact/+1 sequence match on resets when possible */
4037
4038                 if (dst->scrub || src->scrub) {
4039                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4040                             *state, src, dst, copyback))
4041                                 return (PF_DROP);
4042                 }
4043
4044                 /* update max window */
4045                 if (src->max_win < win)
4046                         src->max_win = win;
4047                 /* synchronize sequencing */
4048                 if (SEQ_GT(end, src->seqlo))
4049                         src->seqlo = end;
4050                 /* slide the window of what the other end can send */
4051                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4052                         dst->seqhi = ack + MAX((win << sws), 1);
4053
4054
4055                 /* update states */
4056                 if (th->th_flags & TH_SYN)
4057                         if (src->state < TCPS_SYN_SENT)
4058                                 src->state = TCPS_SYN_SENT;
4059                 if (th->th_flags & TH_FIN)
4060                         if (src->state < TCPS_CLOSING)
4061                                 src->state = TCPS_CLOSING;
4062                 if (th->th_flags & TH_ACK) {
4063                         if (dst->state == TCPS_SYN_SENT) {
4064                                 dst->state = TCPS_ESTABLISHED;
4065                                 if (src->state == TCPS_ESTABLISHED &&
4066                                     (*state)->src_node != NULL &&
4067                                     pf_src_connlimit(state)) {
4068                                         REASON_SET(reason, PFRES_SRCLIMIT);
4069                                         return (PF_DROP);
4070                                 }
4071                         } else if (dst->state == TCPS_CLOSING)
4072                                 dst->state = TCPS_FIN_WAIT_2;
4073                 }
4074                 if (th->th_flags & TH_RST)
4075                         src->state = dst->state = TCPS_TIME_WAIT;
4076
4077                 /* update expire time */
4078                 (*state)->expire = time_uptime;
4079                 if (src->state >= TCPS_FIN_WAIT_2 &&
4080                     dst->state >= TCPS_FIN_WAIT_2)
4081                         (*state)->timeout = PFTM_TCP_CLOSED;
4082                 else if (src->state >= TCPS_CLOSING &&
4083                     dst->state >= TCPS_CLOSING)
4084                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4085                 else if (src->state < TCPS_ESTABLISHED ||
4086                     dst->state < TCPS_ESTABLISHED)
4087                         (*state)->timeout = PFTM_TCP_OPENING;
4088                 else if (src->state >= TCPS_CLOSING ||
4089                     dst->state >= TCPS_CLOSING)
4090                         (*state)->timeout = PFTM_TCP_CLOSING;
4091                 else
4092                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4093
4094                 /* Fall through to PASS packet */
4095
4096         } else if ((dst->state < TCPS_SYN_SENT ||
4097                 dst->state >= TCPS_FIN_WAIT_2 ||
4098                 src->state >= TCPS_FIN_WAIT_2) &&
4099             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4100             /* Within a window forward of the originating packet */
4101             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4102             /* Within a window backward of the originating packet */
4103
4104                 /*
4105                  * This currently handles three situations:
4106                  *  1) Stupid stacks will shotgun SYNs before their peer
4107                  *     replies.
4108                  *  2) When PF catches an already established stream (the
4109                  *     firewall rebooted, the state table was flushed, routes
4110                  *     changed...)
4111                  *  3) Packets get funky immediately after the connection
4112                  *     closes (this should catch Solaris spurious ACK|FINs
4113                  *     that web servers like to spew after a close)
4114                  *
4115                  * This must be a little more careful than the above code
4116                  * since packet floods will also be caught here. We don't
4117                  * update the TTL here to mitigate the damage of a packet
4118                  * flood and so the same code can handle awkward establishment
4119                  * and a loosened connection close.
4120                  * In the establishment case, a correct peer response will
4121                  * validate the connection, go through the normal state code
4122                  * and keep updating the state TTL.
4123                  */
4124
4125                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4126                         printf("pf: loose state match: ");
4127                         pf_print_state(*state);
4128                         pf_print_flags(th->th_flags);
4129                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4130                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4131                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4132                             (unsigned long long)(*state)->packets[1],
4133                             pd->dir == PF_IN ? "in" : "out",
4134                             pd->dir == (*state)->direction ? "fwd" : "rev");
4135                 }
4136
4137                 if (dst->scrub || src->scrub) {
4138                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4139                             *state, src, dst, copyback))
4140                                 return (PF_DROP);
4141                 }
4142
4143                 /* update max window */
4144                 if (src->max_win < win)
4145                         src->max_win = win;
4146                 /* synchronize sequencing */
4147                 if (SEQ_GT(end, src->seqlo))
4148                         src->seqlo = end;
4149                 /* slide the window of what the other end can send */
4150                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4151                         dst->seqhi = ack + MAX((win << sws), 1);
4152
4153                 /*
4154                  * Cannot set dst->seqhi here since this could be a shotgunned
4155                  * SYN and not an already established connection.
4156                  */
4157
4158                 if (th->th_flags & TH_FIN)
4159                         if (src->state < TCPS_CLOSING)
4160                                 src->state = TCPS_CLOSING;
4161                 if (th->th_flags & TH_RST)
4162                         src->state = dst->state = TCPS_TIME_WAIT;
4163
4164                 /* Fall through to PASS packet */
4165
4166         } else {
4167                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4168                     (*state)->src.state == TCPS_SYN_SENT) {
4169                         /* Send RST for state mismatches during handshake */
4170                         if (!(th->th_flags & TH_RST))
4171                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4172                                     pd->dst, pd->src, th->th_dport,
4173                                     th->th_sport, ntohl(th->th_ack), 0,
4174                                     TH_RST, 0, 0,
4175                                     (*state)->rule.ptr->return_ttl, 1, 0,
4176                                     kif->pfik_ifp);
4177                         src->seqlo = 0;
4178                         src->seqhi = 1;
4179                         src->max_win = 1;
4180                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4181                         printf("pf: BAD state: ");
4182                         pf_print_state(*state);
4183                         pf_print_flags(th->th_flags);
4184                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4185                             "pkts=%llu:%llu dir=%s,%s\n",
4186                             seq, orig_seq, ack, pd->p_len, ackskew,
4187                             (unsigned long long)(*state)->packets[0],
4188                             (unsigned long long)(*state)->packets[1],
4189                             pd->dir == PF_IN ? "in" : "out",
4190                             pd->dir == (*state)->direction ? "fwd" : "rev");
4191                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4192                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4193                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4194                             ' ': '2',
4195                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4196                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4197                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4198                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4199                 }
4200                 REASON_SET(reason, PFRES_BADSTATE);
4201                 return (PF_DROP);
4202         }
4203
4204         return (PF_PASS);
4205 }
4206
4207 static int
4208 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4209         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4210 {
4211         struct tcphdr           *th = pd->hdr.tcp;
4212
4213         if (th->th_flags & TH_SYN)
4214                 if (src->state < TCPS_SYN_SENT)
4215                         src->state = TCPS_SYN_SENT;
4216         if (th->th_flags & TH_FIN)
4217                 if (src->state < TCPS_CLOSING)
4218                         src->state = TCPS_CLOSING;
4219         if (th->th_flags & TH_ACK) {
4220                 if (dst->state == TCPS_SYN_SENT) {
4221                         dst->state = TCPS_ESTABLISHED;
4222                         if (src->state == TCPS_ESTABLISHED &&
4223                             (*state)->src_node != NULL &&
4224                             pf_src_connlimit(state)) {
4225                                 REASON_SET(reason, PFRES_SRCLIMIT);
4226                                 return (PF_DROP);
4227                         }
4228                 } else if (dst->state == TCPS_CLOSING) {
4229                         dst->state = TCPS_FIN_WAIT_2;
4230                 } else if (src->state == TCPS_SYN_SENT &&
4231                     dst->state < TCPS_SYN_SENT) {
4232                         /*
4233                          * Handle a special sloppy case where we only see one
4234                          * half of the connection. If there is a ACK after
4235                          * the initial SYN without ever seeing a packet from
4236                          * the destination, set the connection to established.
4237                          */
4238                         dst->state = src->state = TCPS_ESTABLISHED;
4239                         if ((*state)->src_node != NULL &&
4240                             pf_src_connlimit(state)) {
4241                                 REASON_SET(reason, PFRES_SRCLIMIT);
4242                                 return (PF_DROP);
4243                         }
4244                 } else if (src->state == TCPS_CLOSING &&
4245                     dst->state == TCPS_ESTABLISHED &&
4246                     dst->seqlo == 0) {
4247                         /*
4248                          * Handle the closing of half connections where we
4249                          * don't see the full bidirectional FIN/ACK+ACK
4250                          * handshake.
4251                          */
4252                         dst->state = TCPS_CLOSING;
4253                 }
4254         }
4255         if (th->th_flags & TH_RST)
4256                 src->state = dst->state = TCPS_TIME_WAIT;
4257
4258         /* update expire time */
4259         (*state)->expire = time_uptime;
4260         if (src->state >= TCPS_FIN_WAIT_2 &&
4261             dst->state >= TCPS_FIN_WAIT_2)
4262                 (*state)->timeout = PFTM_TCP_CLOSED;
4263         else if (src->state >= TCPS_CLOSING &&
4264             dst->state >= TCPS_CLOSING)
4265                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4266         else if (src->state < TCPS_ESTABLISHED ||
4267             dst->state < TCPS_ESTABLISHED)
4268                 (*state)->timeout = PFTM_TCP_OPENING;
4269         else if (src->state >= TCPS_CLOSING ||
4270             dst->state >= TCPS_CLOSING)
4271                 (*state)->timeout = PFTM_TCP_CLOSING;
4272         else
4273                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4274
4275         return (PF_PASS);
4276 }
4277
4278 static int
4279 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4280     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4281     u_short *reason)
4282 {
4283         struct pf_state_key_cmp  key;
4284         struct tcphdr           *th = pd->hdr.tcp;
4285         int                      copyback = 0;
4286         struct pf_state_peer    *src, *dst;
4287         struct pf_state_key     *sk;
4288
4289         bzero(&key, sizeof(key));
4290         key.af = pd->af;
4291         key.proto = IPPROTO_TCP;
4292         if (direction == PF_IN) {       /* wire side, straight */
4293                 PF_ACPY(&key.addr[0], pd->src, key.af);
4294                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4295                 key.port[0] = th->th_sport;
4296                 key.port[1] = th->th_dport;
4297         } else {                        /* stack side, reverse */
4298                 PF_ACPY(&key.addr[1], pd->src, key.af);
4299                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4300                 key.port[1] = th->th_sport;
4301                 key.port[0] = th->th_dport;
4302         }
4303
4304         STATE_LOOKUP(kif, &key, direction, *state, pd);
4305
4306         if (direction == (*state)->direction) {
4307                 src = &(*state)->src;
4308                 dst = &(*state)->dst;
4309         } else {
4310                 src = &(*state)->dst;
4311                 dst = &(*state)->src;
4312         }
4313
4314         sk = (*state)->key[pd->didx];
4315
4316         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4317                 if (direction != (*state)->direction) {
4318                         REASON_SET(reason, PFRES_SYNPROXY);
4319                         return (PF_SYNPROXY_DROP);
4320                 }
4321                 if (th->th_flags & TH_SYN) {
4322                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4323                                 REASON_SET(reason, PFRES_SYNPROXY);
4324                                 return (PF_DROP);
4325                         }
4326                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4327                             pd->src, th->th_dport, th->th_sport,
4328                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4329                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4330                         REASON_SET(reason, PFRES_SYNPROXY);
4331                         return (PF_SYNPROXY_DROP);
4332                 } else if (!(th->th_flags & TH_ACK) ||
4333                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4334                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4335                         REASON_SET(reason, PFRES_SYNPROXY);
4336                         return (PF_DROP);
4337                 } else if ((*state)->src_node != NULL &&
4338                     pf_src_connlimit(state)) {
4339                         REASON_SET(reason, PFRES_SRCLIMIT);
4340                         return (PF_DROP);
4341                 } else
4342                         (*state)->src.state = PF_TCPS_PROXY_DST;
4343         }
4344         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4345                 if (direction == (*state)->direction) {
4346                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4347                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4348                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4349                                 REASON_SET(reason, PFRES_SYNPROXY);
4350                                 return (PF_DROP);
4351                         }
4352                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4353                         if ((*state)->dst.seqhi == 1)
4354                                 (*state)->dst.seqhi = htonl(arc4random());
4355                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4356                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4357                             sk->port[pd->sidx], sk->port[pd->didx],
4358                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4359                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4360                         REASON_SET(reason, PFRES_SYNPROXY);
4361                         return (PF_SYNPROXY_DROP);
4362                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4363                     (TH_SYN|TH_ACK)) ||
4364                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4365                         REASON_SET(reason, PFRES_SYNPROXY);
4366                         return (PF_DROP);
4367                 } else {
4368                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4369                         (*state)->dst.seqlo = ntohl(th->th_seq);
4370                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4371                             pd->src, th->th_dport, th->th_sport,
4372                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4373                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4374                             (*state)->tag, NULL);
4375                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4376                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4377                             sk->port[pd->sidx], sk->port[pd->didx],
4378                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4379                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4380                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4381                             (*state)->src.seqlo;
4382                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4383                             (*state)->dst.seqlo;
4384                         (*state)->src.seqhi = (*state)->src.seqlo +
4385                             (*state)->dst.max_win;
4386                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4387                             (*state)->src.max_win;
4388                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4389                         (*state)->src.state = (*state)->dst.state =
4390                             TCPS_ESTABLISHED;
4391                         REASON_SET(reason, PFRES_SYNPROXY);
4392                         return (PF_SYNPROXY_DROP);
4393                 }
4394         }
4395
4396         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4397             dst->state >= TCPS_FIN_WAIT_2 &&
4398             src->state >= TCPS_FIN_WAIT_2) {
4399                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4400                         printf("pf: state reuse ");
4401                         pf_print_state(*state);
4402                         pf_print_flags(th->th_flags);
4403                         printf("\n");
4404                 }
4405                 /* XXX make sure it's the same direction ?? */
4406                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4407                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4408                 *state = NULL;
4409                 return (PF_DROP);
4410         }
4411
4412         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4413                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4414                         return (PF_DROP);
4415         } else {
4416                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4417                     &copyback) == PF_DROP)
4418                         return (PF_DROP);
4419         }
4420
4421         /* translate source/destination address, if necessary */
4422         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4423                 struct pf_state_key *nk = (*state)->key[pd->didx];
4424
4425                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4426                     nk->port[pd->sidx] != th->th_sport)
4427                         pf_change_ap(m, pd->src, &th->th_sport,
4428                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4429                             nk->port[pd->sidx], 0, pd->af);
4430
4431                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4432                     nk->port[pd->didx] != th->th_dport)
4433                         pf_change_ap(m, pd->dst, &th->th_dport,
4434                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4435                             nk->port[pd->didx], 0, pd->af);
4436                 copyback = 1;
4437         }
4438
4439         /* Copyback sequence modulation or stateful scrub changes if needed */
4440         if (copyback)
4441                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4442
4443         return (PF_PASS);
4444 }
4445
4446 static int
4447 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4448     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4449 {
4450         struct pf_state_peer    *src, *dst;
4451         struct pf_state_key_cmp  key;
4452         struct udphdr           *uh = pd->hdr.udp;
4453
4454         bzero(&key, sizeof(key));
4455         key.af = pd->af;
4456         key.proto = IPPROTO_UDP;
4457         if (direction == PF_IN) {       /* wire side, straight */
4458                 PF_ACPY(&key.addr[0], pd->src, key.af);
4459                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4460                 key.port[0] = uh->uh_sport;
4461                 key.port[1] = uh->uh_dport;
4462         } else {                        /* stack side, reverse */
4463                 PF_ACPY(&key.addr[1], pd->src, key.af);
4464                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4465                 key.port[1] = uh->uh_sport;
4466                 key.port[0] = uh->uh_dport;
4467         }
4468
4469         STATE_LOOKUP(kif, &key, direction, *state, pd);
4470
4471         if (direction == (*state)->direction) {
4472                 src = &(*state)->src;
4473                 dst = &(*state)->dst;
4474         } else {
4475                 src = &(*state)->dst;
4476                 dst = &(*state)->src;
4477         }
4478
4479         /* update states */
4480         if (src->state < PFUDPS_SINGLE)
4481                 src->state = PFUDPS_SINGLE;
4482         if (dst->state == PFUDPS_SINGLE)
4483                 dst->state = PFUDPS_MULTIPLE;
4484
4485         /* update expire time */
4486         (*state)->expire = time_uptime;
4487         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4488                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4489         else
4490                 (*state)->timeout = PFTM_UDP_SINGLE;
4491
4492         /* translate source/destination address, if necessary */
4493         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4494                 struct pf_state_key *nk = (*state)->key[pd->didx];
4495
4496                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4497                     nk->port[pd->sidx] != uh->uh_sport)
4498                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4499                             &uh->uh_sum, &nk->addr[pd->sidx],
4500                             nk->port[pd->sidx], 1, pd->af);
4501
4502                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4503                     nk->port[pd->didx] != uh->uh_dport)
4504                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4505                             &uh->uh_sum, &nk->addr[pd->didx],
4506                             nk->port[pd->didx], 1, pd->af);
4507                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4508         }
4509
4510         return (PF_PASS);
4511 }
4512
4513 static int
4514 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4515     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4516 {
4517         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4518         u_int16_t        icmpid = 0, *icmpsum;
4519         u_int8_t         icmptype;
4520         int              state_icmp = 0;
4521         struct pf_state_key_cmp key;
4522
4523         bzero(&key, sizeof(key));
4524         switch (pd->proto) {
4525 #ifdef INET
4526         case IPPROTO_ICMP:
4527                 icmptype = pd->hdr.icmp->icmp_type;
4528                 icmpid = pd->hdr.icmp->icmp_id;
4529                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4530
4531                 if (icmptype == ICMP_UNREACH ||
4532                     icmptype == ICMP_SOURCEQUENCH ||
4533                     icmptype == ICMP_REDIRECT ||
4534                     icmptype == ICMP_TIMXCEED ||
4535                     icmptype == ICMP_PARAMPROB)
4536                         state_icmp++;
4537                 break;
4538 #endif /* INET */
4539 #ifdef INET6
4540         case IPPROTO_ICMPV6:
4541                 icmptype = pd->hdr.icmp6->icmp6_type;
4542                 icmpid = pd->hdr.icmp6->icmp6_id;
4543                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4544
4545                 if (icmptype == ICMP6_DST_UNREACH ||
4546                     icmptype == ICMP6_PACKET_TOO_BIG ||
4547                     icmptype == ICMP6_TIME_EXCEEDED ||
4548                     icmptype == ICMP6_PARAM_PROB)
4549                         state_icmp++;
4550                 break;
4551 #endif /* INET6 */
4552         }
4553
4554         if (!state_icmp) {
4555
4556                 /*
4557                  * ICMP query/reply message not related to a TCP/UDP packet.
4558                  * Search for an ICMP state.
4559                  */
4560                 key.af = pd->af;
4561                 key.proto = pd->proto;
4562                 key.port[0] = key.port[1] = icmpid;
4563                 if (direction == PF_IN) {       /* wire side, straight */
4564                         PF_ACPY(&key.addr[0], pd->src, key.af);
4565                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4566                 } else {                        /* stack side, reverse */
4567                         PF_ACPY(&key.addr[1], pd->src, key.af);
4568                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4569                 }
4570
4571                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4572
4573                 (*state)->expire = time_uptime;
4574                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4575
4576                 /* translate source/destination address, if necessary */
4577                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4578                         struct pf_state_key *nk = (*state)->key[pd->didx];
4579
4580                         switch (pd->af) {
4581 #ifdef INET
4582                         case AF_INET:
4583                                 if (PF_ANEQ(pd->src,
4584                                     &nk->addr[pd->sidx], AF_INET))
4585                                         pf_change_a(&saddr->v4.s_addr,
4586                                             pd->ip_sum,
4587                                             nk->addr[pd->sidx].v4.s_addr, 0);
4588
4589                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4590                                     AF_INET))
4591                                         pf_change_a(&daddr->v4.s_addr,
4592                                             pd->ip_sum,
4593                                             nk->addr[pd->didx].v4.s_addr, 0);
4594
4595                                 if (nk->port[0] !=
4596                                     pd->hdr.icmp->icmp_id) {
4597                                         pd->hdr.icmp->icmp_cksum =
4598                                             pf_cksum_fixup(
4599                                             pd->hdr.icmp->icmp_cksum, icmpid,
4600                                             nk->port[pd->sidx], 0);
4601                                         pd->hdr.icmp->icmp_id =
4602                                             nk->port[pd->sidx];
4603                                 }
4604
4605                                 m_copyback(m, off, ICMP_MINLEN,
4606                                     (caddr_t )pd->hdr.icmp);
4607                                 break;
4608 #endif /* INET */
4609 #ifdef INET6
4610                         case AF_INET6:
4611                                 if (PF_ANEQ(pd->src,
4612                                     &nk->addr[pd->sidx], AF_INET6))
4613                                         pf_change_a6(saddr,
4614                                             &pd->hdr.icmp6->icmp6_cksum,
4615                                             &nk->addr[pd->sidx], 0);
4616
4617                                 if (PF_ANEQ(pd->dst,
4618                                     &nk->addr[pd->didx], AF_INET6))
4619                                         pf_change_a6(daddr,
4620                                             &pd->hdr.icmp6->icmp6_cksum,
4621                                             &nk->addr[pd->didx], 0);
4622
4623                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4624                                     (caddr_t )pd->hdr.icmp6);
4625                                 break;
4626 #endif /* INET6 */
4627                         }
4628                 }
4629                 return (PF_PASS);
4630
4631         } else {
4632                 /*
4633                  * ICMP error message in response to a TCP/UDP packet.
4634                  * Extract the inner TCP/UDP header and search for that state.
4635                  */
4636
4637                 struct pf_pdesc pd2;
4638                 bzero(&pd2, sizeof pd2);
4639 #ifdef INET
4640                 struct ip       h2;
4641 #endif /* INET */
4642 #ifdef INET6
4643                 struct ip6_hdr  h2_6;
4644                 int             terminal = 0;
4645 #endif /* INET6 */
4646                 int             ipoff2 = 0;
4647                 int             off2 = 0;
4648
4649                 pd2.af = pd->af;
4650                 /* Payload packet is from the opposite direction. */
4651                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4652                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4653                 switch (pd->af) {
4654 #ifdef INET
4655                 case AF_INET:
4656                         /* offset of h2 in mbuf chain */
4657                         ipoff2 = off + ICMP_MINLEN;
4658
4659                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4660                             NULL, reason, pd2.af)) {
4661                                 DPFPRINTF(PF_DEBUG_MISC,
4662                                     ("pf: ICMP error message too short "
4663                                     "(ip)\n"));
4664                                 return (PF_DROP);
4665                         }
4666                         /*
4667                          * ICMP error messages don't refer to non-first
4668                          * fragments
4669                          */
4670                         if (h2.ip_off & htons(IP_OFFMASK)) {
4671                                 REASON_SET(reason, PFRES_FRAG);
4672                                 return (PF_DROP);
4673                         }
4674
4675                         /* offset of protocol header that follows h2 */
4676                         off2 = ipoff2 + (h2.ip_hl << 2);
4677
4678                         pd2.proto = h2.ip_p;
4679                         pd2.src = (struct pf_addr *)&h2.ip_src;
4680                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4681                         pd2.ip_sum = &h2.ip_sum;
4682                         break;
4683 #endif /* INET */
4684 #ifdef INET6
4685                 case AF_INET6:
4686                         ipoff2 = off + sizeof(struct icmp6_hdr);
4687
4688                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4689                             NULL, reason, pd2.af)) {
4690                                 DPFPRINTF(PF_DEBUG_MISC,
4691                                     ("pf: ICMP error message too short "
4692                                     "(ip6)\n"));
4693                                 return (PF_DROP);
4694                         }
4695                         pd2.proto = h2_6.ip6_nxt;
4696                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4697                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4698                         pd2.ip_sum = NULL;
4699                         off2 = ipoff2 + sizeof(h2_6);
4700                         do {
4701                                 switch (pd2.proto) {
4702                                 case IPPROTO_FRAGMENT:
4703                                         /*
4704                                          * ICMPv6 error messages for
4705                                          * non-first fragments
4706                                          */
4707                                         REASON_SET(reason, PFRES_FRAG);
4708                                         return (PF_DROP);
4709                                 case IPPROTO_AH:
4710                                 case IPPROTO_HOPOPTS:
4711                                 case IPPROTO_ROUTING:
4712                                 case IPPROTO_DSTOPTS: {
4713                                         /* get next header and header length */
4714                                         struct ip6_ext opt6;
4715
4716                                         if (!pf_pull_hdr(m, off2, &opt6,
4717                                             sizeof(opt6), NULL, reason,
4718                                             pd2.af)) {
4719                                                 DPFPRINTF(PF_DEBUG_MISC,
4720                                                     ("pf: ICMPv6 short opt\n"));
4721                                                 return (PF_DROP);
4722                                         }
4723                                         if (pd2.proto == IPPROTO_AH)
4724                                                 off2 += (opt6.ip6e_len + 2) * 4;
4725                                         else
4726                                                 off2 += (opt6.ip6e_len + 1) * 8;
4727                                         pd2.proto = opt6.ip6e_nxt;
4728                                         /* goto the next header */
4729                                         break;
4730                                 }
4731                                 default:
4732                                         terminal++;
4733                                         break;
4734                                 }
4735                         } while (!terminal);
4736                         break;
4737 #endif /* INET6 */
4738                 }
4739
4740                 switch (pd2.proto) {
4741                 case IPPROTO_TCP: {
4742                         struct tcphdr            th;
4743                         u_int32_t                seq;
4744                         struct pf_state_peer    *src, *dst;
4745                         u_int8_t                 dws;
4746                         int                      copyback = 0;
4747
4748                         /*
4749                          * Only the first 8 bytes of the TCP header can be
4750                          * expected. Don't access any TCP header fields after
4751                          * th_seq, an ackskew test is not possible.
4752                          */
4753                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4754                             pd2.af)) {
4755                                 DPFPRINTF(PF_DEBUG_MISC,
4756                                     ("pf: ICMP error message too short "
4757                                     "(tcp)\n"));
4758                                 return (PF_DROP);
4759                         }
4760
4761                         key.af = pd2.af;
4762                         key.proto = IPPROTO_TCP;
4763                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4764                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4765                         key.port[pd2.sidx] = th.th_sport;
4766                         key.port[pd2.didx] = th.th_dport;
4767
4768                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4769
4770                         if (direction == (*state)->direction) {
4771                                 src = &(*state)->dst;
4772                                 dst = &(*state)->src;
4773                         } else {
4774                                 src = &(*state)->src;
4775                                 dst = &(*state)->dst;
4776                         }
4777
4778                         if (src->wscale && dst->wscale)
4779                                 dws = dst->wscale & PF_WSCALE_MASK;
4780                         else
4781                                 dws = 0;
4782
4783                         /* Demodulate sequence number */
4784                         seq = ntohl(th.th_seq) - src->seqdiff;
4785                         if (src->seqdiff) {
4786                                 pf_change_a(&th.th_seq, icmpsum,
4787                                     htonl(seq), 0);
4788                                 copyback = 1;
4789                         }
4790
4791                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4792                             (!SEQ_GEQ(src->seqhi, seq) ||
4793                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4794                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4795                                         printf("pf: BAD ICMP %d:%d ",
4796                                             icmptype, pd->hdr.icmp->icmp_code);
4797                                         pf_print_host(pd->src, 0, pd->af);
4798                                         printf(" -> ");
4799                                         pf_print_host(pd->dst, 0, pd->af);
4800                                         printf(" state: ");
4801                                         pf_print_state(*state);
4802                                         printf(" seq=%u\n", seq);
4803                                 }
4804                                 REASON_SET(reason, PFRES_BADSTATE);
4805                                 return (PF_DROP);
4806                         } else {
4807                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4808                                         printf("pf: OK ICMP %d:%d ",
4809                                             icmptype, pd->hdr.icmp->icmp_code);
4810                                         pf_print_host(pd->src, 0, pd->af);
4811                                         printf(" -> ");
4812                                         pf_print_host(pd->dst, 0, pd->af);
4813                                         printf(" state: ");
4814                                         pf_print_state(*state);
4815                                         printf(" seq=%u\n", seq);
4816                                 }
4817                         }
4818
4819                         /* translate source/destination address, if necessary */
4820                         if ((*state)->key[PF_SK_WIRE] !=
4821                             (*state)->key[PF_SK_STACK]) {
4822                                 struct pf_state_key *nk =
4823                                     (*state)->key[pd->didx];
4824
4825                                 if (PF_ANEQ(pd2.src,
4826                                     &nk->addr[pd2.sidx], pd2.af) ||
4827                                     nk->port[pd2.sidx] != th.th_sport)
4828                                         pf_change_icmp(pd2.src, &th.th_sport,
4829                                             daddr, &nk->addr[pd2.sidx],
4830                                             nk->port[pd2.sidx], NULL,
4831                                             pd2.ip_sum, icmpsum,
4832                                             pd->ip_sum, 0, pd2.af);
4833
4834                                 if (PF_ANEQ(pd2.dst,
4835                                     &nk->addr[pd2.didx], pd2.af) ||
4836                                     nk->port[pd2.didx] != th.th_dport)
4837                                         pf_change_icmp(pd2.dst, &th.th_dport,
4838                                             saddr, &nk->addr[pd2.didx],
4839                                             nk->port[pd2.didx], NULL,
4840                                             pd2.ip_sum, icmpsum,
4841                                             pd->ip_sum, 0, pd2.af);
4842                                 copyback = 1;
4843                         }
4844
4845                         if (copyback) {
4846                                 switch (pd2.af) {
4847 #ifdef INET
4848                                 case AF_INET:
4849                                         m_copyback(m, off, ICMP_MINLEN,
4850                                             (caddr_t )pd->hdr.icmp);
4851                                         m_copyback(m, ipoff2, sizeof(h2),
4852                                             (caddr_t )&h2);
4853                                         break;
4854 #endif /* INET */
4855 #ifdef INET6
4856                                 case AF_INET6:
4857                                         m_copyback(m, off,
4858                                             sizeof(struct icmp6_hdr),
4859                                             (caddr_t )pd->hdr.icmp6);
4860                                         m_copyback(m, ipoff2, sizeof(h2_6),
4861                                             (caddr_t )&h2_6);
4862                                         break;
4863 #endif /* INET6 */
4864                                 }
4865                                 m_copyback(m, off2, 8, (caddr_t)&th);
4866                         }
4867
4868                         return (PF_PASS);
4869                         break;
4870                 }
4871                 case IPPROTO_UDP: {
4872                         struct udphdr           uh;
4873
4874                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4875                             NULL, reason, pd2.af)) {
4876                                 DPFPRINTF(PF_DEBUG_MISC,
4877                                     ("pf: ICMP error message too short "
4878                                     "(udp)\n"));
4879                                 return (PF_DROP);
4880                         }
4881
4882                         key.af = pd2.af;
4883                         key.proto = IPPROTO_UDP;
4884                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4885                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4886                         key.port[pd2.sidx] = uh.uh_sport;
4887                         key.port[pd2.didx] = uh.uh_dport;
4888
4889                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4890
4891                         /* translate source/destination address, if necessary */
4892                         if ((*state)->key[PF_SK_WIRE] !=
4893                             (*state)->key[PF_SK_STACK]) {
4894                                 struct pf_state_key *nk =
4895                                     (*state)->key[pd->didx];
4896
4897                                 if (PF_ANEQ(pd2.src,
4898                                     &nk->addr[pd2.sidx], pd2.af) ||
4899                                     nk->port[pd2.sidx] != uh.uh_sport)
4900                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4901                                             daddr, &nk->addr[pd2.sidx],
4902                                             nk->port[pd2.sidx], &uh.uh_sum,
4903                                             pd2.ip_sum, icmpsum,
4904                                             pd->ip_sum, 1, pd2.af);
4905
4906                                 if (PF_ANEQ(pd2.dst,
4907                                     &nk->addr[pd2.didx], pd2.af) ||
4908                                     nk->port[pd2.didx] != uh.uh_dport)
4909                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4910                                             saddr, &nk->addr[pd2.didx],
4911                                             nk->port[pd2.didx], &uh.uh_sum,
4912                                             pd2.ip_sum, icmpsum,
4913                                             pd->ip_sum, 1, 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                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4934                         }
4935                         return (PF_PASS);
4936                         break;
4937                 }
4938 #ifdef INET
4939                 case IPPROTO_ICMP: {
4940                         struct icmp             iih;
4941
4942                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4943                             NULL, reason, pd2.af)) {
4944                                 DPFPRINTF(PF_DEBUG_MISC,
4945                                     ("pf: ICMP error message too short i"
4946                                     "(icmp)\n"));
4947                                 return (PF_DROP);
4948                         }
4949
4950                         key.af = pd2.af;
4951                         key.proto = IPPROTO_ICMP;
4952                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4953                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4954                         key.port[0] = key.port[1] = iih.icmp_id;
4955
4956                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4957
4958                         /* translate source/destination address, if necessary */
4959                         if ((*state)->key[PF_SK_WIRE] !=
4960                             (*state)->key[PF_SK_STACK]) {
4961                                 struct pf_state_key *nk =
4962                                     (*state)->key[pd->didx];
4963
4964                                 if (PF_ANEQ(pd2.src,
4965                                     &nk->addr[pd2.sidx], pd2.af) ||
4966                                     nk->port[pd2.sidx] != iih.icmp_id)
4967                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4968                                             daddr, &nk->addr[pd2.sidx],
4969                                             nk->port[pd2.sidx], NULL,
4970                                             pd2.ip_sum, icmpsum,
4971                                             pd->ip_sum, 0, AF_INET);
4972
4973                                 if (PF_ANEQ(pd2.dst,
4974                                     &nk->addr[pd2.didx], pd2.af) ||
4975                                     nk->port[pd2.didx] != iih.icmp_id)
4976                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4977                                             saddr, &nk->addr[pd2.didx],
4978                                             nk->port[pd2.didx], NULL,
4979                                             pd2.ip_sum, icmpsum,
4980                                             pd->ip_sum, 0, AF_INET);
4981
4982                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4983                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4984                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4985                         }
4986                         return (PF_PASS);
4987                         break;
4988                 }
4989 #endif /* INET */
4990 #ifdef INET6
4991                 case IPPROTO_ICMPV6: {
4992                         struct icmp6_hdr        iih;
4993
4994                         if (!pf_pull_hdr(m, off2, &iih,
4995                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
4996                                 DPFPRINTF(PF_DEBUG_MISC,
4997                                     ("pf: ICMP error message too short "
4998                                     "(icmp6)\n"));
4999                                 return (PF_DROP);
5000                         }
5001
5002                         key.af = pd2.af;
5003                         key.proto = IPPROTO_ICMPV6;
5004                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5005                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5006                         key.port[0] = key.port[1] = iih.icmp6_id;
5007
5008                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5009
5010                         /* translate source/destination address, if necessary */
5011                         if ((*state)->key[PF_SK_WIRE] !=
5012                             (*state)->key[PF_SK_STACK]) {
5013                                 struct pf_state_key *nk =
5014                                     (*state)->key[pd->didx];
5015
5016                                 if (PF_ANEQ(pd2.src,
5017                                     &nk->addr[pd2.sidx], pd2.af) ||
5018                                     nk->port[pd2.sidx] != iih.icmp6_id)
5019                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5020                                             daddr, &nk->addr[pd2.sidx],
5021                                             nk->port[pd2.sidx], NULL,
5022                                             pd2.ip_sum, icmpsum,
5023                                             pd->ip_sum, 0, AF_INET6);
5024
5025                                 if (PF_ANEQ(pd2.dst,
5026                                     &nk->addr[pd2.didx], pd2.af) ||
5027                                     nk->port[pd2.didx] != iih.icmp6_id)
5028                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5029                                             saddr, &nk->addr[pd2.didx],
5030                                             nk->port[pd2.didx], NULL,
5031                                             pd2.ip_sum, icmpsum,
5032                                             pd->ip_sum, 0, AF_INET6);
5033
5034                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5035                                     (caddr_t)pd->hdr.icmp6);
5036                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5037                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5038                                     (caddr_t)&iih);
5039                         }
5040                         return (PF_PASS);
5041                         break;
5042                 }
5043 #endif /* INET6 */
5044                 default: {
5045                         key.af = pd2.af;
5046                         key.proto = pd2.proto;
5047                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5048                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5049                         key.port[0] = key.port[1] = 0;
5050
5051                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5052
5053                         /* translate source/destination address, if necessary */
5054                         if ((*state)->key[PF_SK_WIRE] !=
5055                             (*state)->key[PF_SK_STACK]) {
5056                                 struct pf_state_key *nk =
5057                                     (*state)->key[pd->didx];
5058
5059                                 if (PF_ANEQ(pd2.src,
5060                                     &nk->addr[pd2.sidx], pd2.af))
5061                                         pf_change_icmp(pd2.src, NULL, daddr,
5062                                             &nk->addr[pd2.sidx], 0, NULL,
5063                                             pd2.ip_sum, icmpsum,
5064                                             pd->ip_sum, 0, pd2.af);
5065
5066                                 if (PF_ANEQ(pd2.dst,
5067                                     &nk->addr[pd2.didx], pd2.af))
5068                                         pf_change_icmp(pd2.dst, NULL, saddr,
5069                                             &nk->addr[pd2.didx], 0, NULL,
5070                                             pd2.ip_sum, icmpsum,
5071                                             pd->ip_sum, 0, pd2.af);
5072
5073                                 switch (pd2.af) {
5074 #ifdef INET
5075                                 case AF_INET:
5076                                         m_copyback(m, off, ICMP_MINLEN,
5077                                             (caddr_t)pd->hdr.icmp);
5078                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5079                                         break;
5080 #endif /* INET */
5081 #ifdef INET6
5082                                 case AF_INET6:
5083                                         m_copyback(m, off,
5084                                             sizeof(struct icmp6_hdr),
5085                                             (caddr_t )pd->hdr.icmp6);
5086                                         m_copyback(m, ipoff2, sizeof(h2_6),
5087                                             (caddr_t )&h2_6);
5088                                         break;
5089 #endif /* INET6 */
5090                                 }
5091                         }
5092                         return (PF_PASS);
5093                         break;
5094                 }
5095                 }
5096         }
5097 }
5098
5099 static int
5100 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5101     struct mbuf *m, struct pf_pdesc *pd)
5102 {
5103         struct pf_state_peer    *src, *dst;
5104         struct pf_state_key_cmp  key;
5105
5106         bzero(&key, sizeof(key));
5107         key.af = pd->af;
5108         key.proto = pd->proto;
5109         if (direction == PF_IN) {
5110                 PF_ACPY(&key.addr[0], pd->src, key.af);
5111                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5112                 key.port[0] = key.port[1] = 0;
5113         } else {
5114                 PF_ACPY(&key.addr[1], pd->src, key.af);
5115                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5116                 key.port[1] = key.port[0] = 0;
5117         }
5118
5119         STATE_LOOKUP(kif, &key, direction, *state, pd);
5120
5121         if (direction == (*state)->direction) {
5122                 src = &(*state)->src;
5123                 dst = &(*state)->dst;
5124         } else {
5125                 src = &(*state)->dst;
5126                 dst = &(*state)->src;
5127         }
5128
5129         /* update states */
5130         if (src->state < PFOTHERS_SINGLE)
5131                 src->state = PFOTHERS_SINGLE;
5132         if (dst->state == PFOTHERS_SINGLE)
5133                 dst->state = PFOTHERS_MULTIPLE;
5134
5135         /* update expire time */
5136         (*state)->expire = time_uptime;
5137         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5138                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5139         else
5140                 (*state)->timeout = PFTM_OTHER_SINGLE;
5141
5142         /* translate source/destination address, if necessary */
5143         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5144                 struct pf_state_key *nk = (*state)->key[pd->didx];
5145
5146                 KASSERT(nk, ("%s: nk is null", __func__));
5147                 KASSERT(pd, ("%s: pd is null", __func__));
5148                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
5149                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5150                 switch (pd->af) {
5151 #ifdef INET
5152                 case AF_INET:
5153                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5154                                 pf_change_a(&pd->src->v4.s_addr,
5155                                     pd->ip_sum,
5156                                     nk->addr[pd->sidx].v4.s_addr,
5157                                     0);
5158
5159
5160                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5161                                 pf_change_a(&pd->dst->v4.s_addr,
5162                                     pd->ip_sum,
5163                                     nk->addr[pd->didx].v4.s_addr,
5164                                     0);
5165
5166                                 break;
5167 #endif /* INET */
5168 #ifdef INET6
5169                 case AF_INET6:
5170                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5171                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5172
5173                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5174                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5175 #endif /* INET6 */
5176                 }
5177         }
5178         return (PF_PASS);
5179 }
5180
5181 /*
5182  * ipoff and off are measured from the start of the mbuf chain.
5183  * h must be at "ipoff" on the mbuf chain.
5184  */
5185 void *
5186 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5187     u_short *actionp, u_short *reasonp, sa_family_t af)
5188 {
5189         switch (af) {
5190 #ifdef INET
5191         case AF_INET: {
5192                 struct ip       *h = mtod(m, struct ip *);
5193                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5194
5195                 if (fragoff) {
5196                         if (fragoff >= len)
5197                                 ACTION_SET(actionp, PF_PASS);
5198                         else {
5199                                 ACTION_SET(actionp, PF_DROP);
5200                                 REASON_SET(reasonp, PFRES_FRAG);
5201                         }
5202                         return (NULL);
5203                 }
5204                 if (m->m_pkthdr.len < off + len ||
5205                     ntohs(h->ip_len) < off + len) {
5206                         ACTION_SET(actionp, PF_DROP);
5207                         REASON_SET(reasonp, PFRES_SHORT);
5208                         return (NULL);
5209                 }
5210                 break;
5211         }
5212 #endif /* INET */
5213 #ifdef INET6
5214         case AF_INET6: {
5215                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5216
5217                 if (m->m_pkthdr.len < off + len ||
5218                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5219                     (unsigned)(off + len)) {
5220                         ACTION_SET(actionp, PF_DROP);
5221                         REASON_SET(reasonp, PFRES_SHORT);
5222                         return (NULL);
5223                 }
5224                 break;
5225         }
5226 #endif /* INET6 */
5227         }
5228         m_copydata(m, off, len, p);
5229         return (p);
5230 }
5231
5232 #ifdef RADIX_MPATH
5233 static int
5234 pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5235     int rtableid)
5236 {
5237         struct radix_node_head  *rnh;
5238         struct sockaddr_in      *dst;
5239         int                      ret = 1;
5240         int                      check_mpath;
5241 #ifdef INET6
5242         struct sockaddr_in6     *dst6;
5243         struct route_in6         ro;
5244 #else
5245         struct route             ro;
5246 #endif
5247         struct radix_node       *rn;
5248         struct rtentry          *rt;
5249         struct ifnet            *ifp;
5250
5251         check_mpath = 0;
5252         /* XXX: stick to table 0 for now */
5253         rnh = rt_tables_get_rnh(0, af);
5254         if (rnh != NULL && rn_mpath_capable(rnh))
5255                 check_mpath = 1;
5256         bzero(&ro, sizeof(ro));
5257         switch (af) {
5258         case AF_INET:
5259                 dst = satosin(&ro.ro_dst);
5260                 dst->sin_family = AF_INET;
5261                 dst->sin_len = sizeof(*dst);
5262                 dst->sin_addr = addr->v4;
5263                 break;
5264 #ifdef INET6
5265         case AF_INET6:
5266                 /*
5267                  * Skip check for addresses with embedded interface scope,
5268                  * as they would always match anyway.
5269                  */
5270                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5271                         goto out;
5272                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5273                 dst6->sin6_family = AF_INET6;
5274                 dst6->sin6_len = sizeof(*dst6);
5275                 dst6->sin6_addr = addr->v6;
5276                 break;
5277 #endif /* INET6 */
5278         default:
5279                 return (0);
5280         }
5281
5282         /* Skip checks for ipsec interfaces */
5283         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5284                 goto out;
5285
5286         switch (af) {
5287 #ifdef INET6
5288         case AF_INET6:
5289                 in6_rtalloc_ign(&ro, 0, rtableid);
5290                 break;
5291 #endif
5292 #ifdef INET
5293         case AF_INET:
5294                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5295                 break;
5296 #endif
5297         }
5298
5299         if (ro.ro_rt != NULL) {
5300                 /* No interface given, this is a no-route check */
5301                 if (kif == NULL)
5302                         goto out;
5303
5304                 if (kif->pfik_ifp == NULL) {
5305                         ret = 0;
5306                         goto out;
5307                 }
5308
5309                 /* Perform uRPF check if passed input interface */
5310                 ret = 0;
5311                 rn = (struct radix_node *)ro.ro_rt;
5312                 do {
5313                         rt = (struct rtentry *)rn;
5314                         ifp = rt->rt_ifp;
5315
5316                         if (kif->pfik_ifp == ifp)
5317                                 ret = 1;
5318                         rn = rn_mpath_next(rn);
5319                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5320         } else
5321                 ret = 0;
5322 out:
5323         if (ro.ro_rt != NULL)
5324                 RTFREE(ro.ro_rt);
5325         return (ret);
5326 }
5327 #endif
5328
5329 int
5330 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5331     int rtableid)
5332 {
5333 #ifdef INET
5334         struct nhop4_basic      nh4;
5335 #endif
5336 #ifdef INET6
5337         struct nhop6_basic      nh6;
5338 #endif
5339         struct ifnet            *ifp;
5340 #ifdef RADIX_MPATH
5341         struct radix_node_head  *rnh;
5342
5343         /* XXX: stick to table 0 for now */
5344         rnh = rt_tables_get_rnh(0, af);
5345         if (rnh != NULL && rn_mpath_capable(rnh))
5346                 return (pf_routable_oldmpath(addr, af, kif, rtableid));
5347 #endif
5348         /*
5349          * Skip check for addresses with embedded interface scope,
5350          * as they would always match anyway.
5351          */
5352         if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
5353                 return (1);
5354
5355         if (af != AF_INET && af != AF_INET6)
5356                 return (0);
5357
5358         /* Skip checks for ipsec interfaces */
5359         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5360                 return (1);
5361
5362         ifp = NULL;
5363
5364         switch (af) {
5365 #ifdef INET6
5366         case AF_INET6:
5367                 if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
5368                         return (0);
5369                 ifp = nh6.nh_ifp;
5370                 break;
5371 #endif
5372 #ifdef INET
5373         case AF_INET:
5374                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
5375                         return (0);
5376                 ifp = nh4.nh_ifp;
5377                 break;
5378 #endif
5379         }
5380
5381         /* No interface given, this is a no-route check */
5382         if (kif == NULL)
5383                 return (1);
5384
5385         if (kif->pfik_ifp == NULL)
5386                 return (0);
5387
5388         /* Perform uRPF check if passed input interface */
5389         if (kif->pfik_ifp == ifp)
5390                 return (1);
5391         return (0);
5392 }
5393
5394 #ifdef INET
5395 static void
5396 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5397     struct pf_state *s, struct pf_pdesc *pd)
5398 {
5399         struct mbuf             *m0, *m1;
5400         struct sockaddr_in      dst;
5401         struct ip               *ip;
5402         struct ifnet            *ifp = NULL;
5403         struct pf_addr           naddr;
5404         struct pf_src_node      *sn = NULL;
5405         int                      error = 0;
5406         uint16_t                 ip_len, ip_off;
5407
5408         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5409         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5410             __func__));
5411
5412         if ((pd->pf_mtag == NULL &&
5413             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5414             pd->pf_mtag->routed++ > 3) {
5415                 m0 = *m;
5416                 *m = NULL;
5417                 goto bad_locked;
5418         }
5419
5420         if (r->rt == PF_DUPTO) {
5421                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5422                         if (s)
5423                                 PF_STATE_UNLOCK(s);
5424                         return;
5425                 }
5426         } else {
5427                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5428                         if (s)
5429                                 PF_STATE_UNLOCK(s);
5430                         return;
5431                 }
5432                 m0 = *m;
5433         }
5434
5435         ip = mtod(m0, struct ip *);
5436
5437         bzero(&dst, sizeof(dst));
5438         dst.sin_family = AF_INET;
5439         dst.sin_len = sizeof(dst);
5440         dst.sin_addr = ip->ip_dst;
5441
5442         if (r->rt == PF_FASTROUTE) {
5443                 struct nhop4_basic nh4;
5444
5445                 if (s)
5446                         PF_STATE_UNLOCK(s);
5447
5448                 if (fib4_lookup_nh_basic(M_GETFIB(m0), ip->ip_dst, 0,
5449                     m0->m_pkthdr.flowid, &nh4) != 0) {
5450                         KMOD_IPSTAT_INC(ips_noroute);
5451                         error = EHOSTUNREACH;
5452                         goto bad;
5453                 }
5454
5455                 ifp = nh4.nh_ifp;
5456                 dst.sin_addr = nh4.nh_addr;
5457         } else {
5458                 if (TAILQ_EMPTY(&r->rpool.list)) {
5459                         DPFPRINTF(PF_DEBUG_URGENT,
5460                             ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5461                         goto bad_locked;
5462                 }
5463                 if (s == NULL) {
5464                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5465                             &naddr, NULL, &sn);
5466                         if (!PF_AZERO(&naddr, AF_INET))
5467                                 dst.sin_addr.s_addr = naddr.v4.s_addr;
5468                         ifp = r->rpool.cur->kif ?
5469                             r->rpool.cur->kif->pfik_ifp : NULL;
5470                 } else {
5471                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5472                                 dst.sin_addr.s_addr =
5473                                     s->rt_addr.v4.s_addr;
5474                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5475                         PF_STATE_UNLOCK(s);
5476                 }
5477         }
5478         if (ifp == NULL)
5479                 goto bad;
5480
5481         if (oifp != ifp) {
5482                 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5483                         goto bad;
5484                 else if (m0 == NULL)
5485                         goto done;
5486                 if (m0->m_len < sizeof(struct ip)) {
5487                         DPFPRINTF(PF_DEBUG_URGENT,
5488                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5489                         goto bad;
5490                 }
5491                 ip = mtod(m0, struct ip *);
5492         }
5493
5494         if (ifp->if_flags & IFF_LOOPBACK)
5495                 m0->m_flags |= M_SKIP_FIREWALL;
5496
5497         ip_len = ntohs(ip->ip_len);
5498         ip_off = ntohs(ip->ip_off);
5499
5500         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5501         m0->m_pkthdr.csum_flags |= CSUM_IP;
5502         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5503                 in_delayed_cksum(m0);
5504                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5505         }
5506 #ifdef SCTP
5507         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5508                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5509                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5510         }
5511 #endif
5512
5513         /*
5514          * If small enough for interface, or the interface will take
5515          * care of the fragmentation for us, we can just send directly.
5516          */
5517         if (ip_len <= ifp->if_mtu ||
5518             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
5519                 ip->ip_sum = 0;
5520                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5521                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5522                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5523                 }
5524                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5525                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5526                 goto done;
5527         }
5528
5529         /* Balk when DF bit is set or the interface didn't support TSO. */
5530         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5531                 error = EMSGSIZE;
5532                 KMOD_IPSTAT_INC(ips_cantfrag);
5533                 if (r->rt != PF_DUPTO) {
5534                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5535                             ifp->if_mtu);
5536                         goto done;
5537                 } else
5538                         goto bad;
5539         }
5540
5541         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5542         if (error)
5543                 goto bad;
5544
5545         for (; m0; m0 = m1) {
5546                 m1 = m0->m_nextpkt;
5547                 m0->m_nextpkt = NULL;
5548                 if (error == 0) {
5549                         m_clrprotoflags(m0);
5550                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5551                 } else
5552                         m_freem(m0);
5553         }
5554
5555         if (error == 0)
5556                 KMOD_IPSTAT_INC(ips_fragmented);
5557
5558 done:
5559         if (r->rt != PF_DUPTO)
5560                 *m = NULL;
5561         return;
5562
5563 bad_locked:
5564         if (s)
5565                 PF_STATE_UNLOCK(s);
5566 bad:
5567         m_freem(m0);
5568         goto done;
5569 }
5570 #endif /* INET */
5571
5572 #ifdef INET6
5573 static void
5574 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5575     struct pf_state *s, struct pf_pdesc *pd)
5576 {
5577         struct mbuf             *m0;
5578         struct sockaddr_in6     dst;
5579         struct ip6_hdr          *ip6;
5580         struct ifnet            *ifp = NULL;
5581         struct pf_addr           naddr;
5582         struct pf_src_node      *sn = NULL;
5583
5584         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5585         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5586             __func__));
5587
5588         if ((pd->pf_mtag == NULL &&
5589             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5590             pd->pf_mtag->routed++ > 3) {
5591                 m0 = *m;
5592                 *m = NULL;
5593                 goto bad_locked;
5594         }
5595
5596         if (r->rt == PF_DUPTO) {
5597                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5598                         if (s)
5599                                 PF_STATE_UNLOCK(s);
5600                         return;
5601                 }
5602         } else {
5603                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5604                         if (s)
5605                                 PF_STATE_UNLOCK(s);
5606                         return;
5607                 }
5608                 m0 = *m;
5609         }
5610
5611         ip6 = mtod(m0, struct ip6_hdr *);
5612
5613         bzero(&dst, sizeof(dst));
5614         dst.sin6_family = AF_INET6;
5615         dst.sin6_len = sizeof(dst);
5616         dst.sin6_addr = ip6->ip6_dst;
5617
5618         /* Cheat. XXX why only in the v6 case??? */
5619         if (r->rt == PF_FASTROUTE) {
5620                 if (s)
5621                         PF_STATE_UNLOCK(s);
5622                 m0->m_flags |= M_SKIP_FIREWALL;
5623                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5624                 *m = NULL;
5625                 return;
5626         }
5627
5628         if (TAILQ_EMPTY(&r->rpool.list)) {
5629                 DPFPRINTF(PF_DEBUG_URGENT,
5630                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5631                 goto bad_locked;
5632         }
5633         if (s == NULL) {
5634                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5635                     &naddr, NULL, &sn);
5636                 if (!PF_AZERO(&naddr, AF_INET6))
5637                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5638                             &naddr, AF_INET6);
5639                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5640         } else {
5641                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5642                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5643                             &s->rt_addr, AF_INET6);
5644                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5645         }
5646
5647         if (s)
5648                 PF_STATE_UNLOCK(s);
5649
5650         if (ifp == NULL)
5651                 goto bad;
5652
5653         if (oifp != ifp) {
5654                 if (pf_test6(PF_FWD, ifp, &m0, NULL) != PF_PASS)
5655                         goto bad;
5656                 else if (m0 == NULL)
5657                         goto done;
5658                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5659                         DPFPRINTF(PF_DEBUG_URGENT,
5660                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5661                             __func__));
5662                         goto bad;
5663                 }
5664                 ip6 = mtod(m0, struct ip6_hdr *);
5665         }
5666
5667         if (ifp->if_flags & IFF_LOOPBACK)
5668                 m0->m_flags |= M_SKIP_FIREWALL;
5669
5670         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5671             ~ifp->if_hwassist) {
5672                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5673                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5674                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5675         }
5676
5677         /*
5678          * If the packet is too large for the outgoing interface,
5679          * send back an icmp6 error.
5680          */
5681         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5682                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5683         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5684                 nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
5685         else {
5686                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5687                 if (r->rt != PF_DUPTO)
5688                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5689                 else
5690                         goto bad;
5691         }
5692
5693 done:
5694         if (r->rt != PF_DUPTO)
5695                 *m = NULL;
5696         return;
5697
5698 bad_locked:
5699         if (s)
5700                 PF_STATE_UNLOCK(s);
5701 bad:
5702         m_freem(m0);
5703         goto done;
5704 }
5705 #endif /* INET6 */
5706
5707 /*
5708  * FreeBSD supports cksum offloads for the following drivers.
5709  *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
5710  *   ti(4), txp(4), xl(4)
5711  *
5712  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5713  *  network driver performed cksum including pseudo header, need to verify
5714  *   csum_data
5715  * CSUM_DATA_VALID :
5716  *  network driver performed cksum, needs to additional pseudo header
5717  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5718  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5719  *
5720  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5721  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5722  * TCP/UDP layer.
5723  * Also, set csum_data to 0xffff to force cksum validation.
5724  */
5725 static int
5726 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5727 {
5728         u_int16_t sum = 0;
5729         int hw_assist = 0;
5730         struct ip *ip;
5731
5732         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5733                 return (1);
5734         if (m->m_pkthdr.len < off + len)
5735                 return (1);
5736
5737         switch (p) {
5738         case IPPROTO_TCP:
5739                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5740                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5741                                 sum = m->m_pkthdr.csum_data;
5742                         } else {
5743                                 ip = mtod(m, struct ip *);
5744                                 sum = in_pseudo(ip->ip_src.s_addr,
5745                                 ip->ip_dst.s_addr, htonl((u_short)len +
5746                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5747                         }
5748                         sum ^= 0xffff;
5749                         ++hw_assist;
5750                 }
5751                 break;
5752         case IPPROTO_UDP:
5753                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5754                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5755                                 sum = m->m_pkthdr.csum_data;
5756                         } else {
5757                                 ip = mtod(m, struct ip *);
5758                                 sum = in_pseudo(ip->ip_src.s_addr,
5759                                 ip->ip_dst.s_addr, htonl((u_short)len +
5760                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5761                         }
5762                         sum ^= 0xffff;
5763                         ++hw_assist;
5764                 }
5765                 break;
5766         case IPPROTO_ICMP:
5767 #ifdef INET6
5768         case IPPROTO_ICMPV6:
5769 #endif /* INET6 */
5770                 break;
5771         default:
5772                 return (1);
5773         }
5774
5775         if (!hw_assist) {
5776                 switch (af) {
5777                 case AF_INET:
5778                         if (p == IPPROTO_ICMP) {
5779                                 if (m->m_len < off)
5780                                         return (1);
5781                                 m->m_data += off;
5782                                 m->m_len -= off;
5783                                 sum = in_cksum(m, len);
5784                                 m->m_data -= off;
5785                                 m->m_len += off;
5786                         } else {
5787                                 if (m->m_len < sizeof(struct ip))
5788                                         return (1);
5789                                 sum = in4_cksum(m, p, off, len);
5790                         }
5791                         break;
5792 #ifdef INET6
5793                 case AF_INET6:
5794                         if (m->m_len < sizeof(struct ip6_hdr))
5795                                 return (1);
5796                         sum = in6_cksum(m, p, off, len);
5797                         break;
5798 #endif /* INET6 */
5799                 default:
5800                         return (1);
5801                 }
5802         }
5803         if (sum) {
5804                 switch (p) {
5805                 case IPPROTO_TCP:
5806                     {
5807                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5808                         break;
5809                     }
5810                 case IPPROTO_UDP:
5811                     {
5812                         KMOD_UDPSTAT_INC(udps_badsum);
5813                         break;
5814                     }
5815 #ifdef INET
5816                 case IPPROTO_ICMP:
5817                     {
5818                         KMOD_ICMPSTAT_INC(icps_checksum);
5819                         break;
5820                     }
5821 #endif
5822 #ifdef INET6
5823                 case IPPROTO_ICMPV6:
5824                     {
5825                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5826                         break;
5827                     }
5828 #endif /* INET6 */
5829                 }
5830                 return (1);
5831         } else {
5832                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5833                         m->m_pkthdr.csum_flags |=
5834                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5835                         m->m_pkthdr.csum_data = 0xffff;
5836                 }
5837         }
5838         return (0);
5839 }
5840
5841
5842 #ifdef INET
5843 int
5844 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5845 {
5846         struct pfi_kif          *kif;
5847         u_short                  action, reason = 0, log = 0;
5848         struct mbuf             *m = *m0;
5849         struct ip               *h = NULL;
5850         struct m_tag            *ipfwtag;
5851         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5852         struct pf_state         *s = NULL;
5853         struct pf_ruleset       *ruleset = NULL;
5854         struct pf_pdesc          pd;
5855         int                      off, dirndx, pqid = 0;
5856
5857         M_ASSERTPKTHDR(m);
5858
5859         if (!V_pf_status.running)
5860                 return (PF_PASS);
5861
5862         memset(&pd, 0, sizeof(pd));
5863
5864         kif = (struct pfi_kif *)ifp->if_pf_kif;
5865
5866         if (kif == NULL) {
5867                 DPFPRINTF(PF_DEBUG_URGENT,
5868                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5869                 return (PF_DROP);
5870         }
5871         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5872                 return (PF_PASS);
5873
5874         if (m->m_flags & M_SKIP_FIREWALL)
5875                 return (PF_PASS);
5876
5877         pd.pf_mtag = pf_find_mtag(m);
5878
5879         PF_RULES_RLOCK();
5880
5881         if (ip_divert_ptr != NULL &&
5882             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5883                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5884                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5885                         if (pd.pf_mtag == NULL &&
5886                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5887                                 action = PF_DROP;
5888                                 goto done;
5889                         }
5890                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5891                         m_tag_delete(m, ipfwtag);
5892                 }
5893                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5894                         m->m_flags |= M_FASTFWD_OURS;
5895                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5896                 }
5897         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5898                 /* We do IP header normalization and packet reassembly here */
5899                 action = PF_DROP;
5900                 goto done;
5901         }
5902         m = *m0;        /* pf_normalize messes with m0 */
5903         h = mtod(m, struct ip *);
5904
5905         off = h->ip_hl << 2;
5906         if (off < (int)sizeof(struct ip)) {
5907                 action = PF_DROP;
5908                 REASON_SET(&reason, PFRES_SHORT);
5909                 log = 1;
5910                 goto done;
5911         }
5912
5913         pd.src = (struct pf_addr *)&h->ip_src;
5914         pd.dst = (struct pf_addr *)&h->ip_dst;
5915         pd.sport = pd.dport = NULL;
5916         pd.ip_sum = &h->ip_sum;
5917         pd.proto_sum = NULL;
5918         pd.proto = h->ip_p;
5919         pd.dir = dir;
5920         pd.sidx = (dir == PF_IN) ? 0 : 1;
5921         pd.didx = (dir == PF_IN) ? 1 : 0;
5922         pd.af = AF_INET;
5923         pd.tos = h->ip_tos;
5924         pd.tot_len = ntohs(h->ip_len);
5925
5926         /* handle fragments that didn't get reassembled by normalization */
5927         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5928                 action = pf_test_fragment(&r, dir, kif, m, h,
5929                     &pd, &a, &ruleset);
5930                 goto done;
5931         }
5932
5933         switch (h->ip_p) {
5934
5935         case IPPROTO_TCP: {
5936                 struct tcphdr   th;
5937
5938                 pd.hdr.tcp = &th;
5939                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5940                     &action, &reason, AF_INET)) {
5941                         log = action != PF_PASS;
5942                         goto done;
5943                 }
5944                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5945                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5946                         pqid = 1;
5947                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5948                 if (action == PF_DROP)
5949                         goto done;
5950                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5951                     &reason);
5952                 if (action == PF_PASS) {
5953                         if (pfsync_update_state_ptr != NULL)
5954                                 pfsync_update_state_ptr(s);
5955                         r = s->rule.ptr;
5956                         a = s->anchor.ptr;
5957                         log = s->log;
5958                 } else if (s == NULL)
5959                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5960                             &a, &ruleset, inp);
5961                 break;
5962         }
5963
5964         case IPPROTO_UDP: {
5965                 struct udphdr   uh;
5966
5967                 pd.hdr.udp = &uh;
5968                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5969                     &action, &reason, AF_INET)) {
5970                         log = action != PF_PASS;
5971                         goto done;
5972                 }
5973                 if (uh.uh_dport == 0 ||
5974                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5975                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5976                         action = PF_DROP;
5977                         REASON_SET(&reason, PFRES_SHORT);
5978                         goto done;
5979                 }
5980                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5981                 if (action == PF_PASS) {
5982                         if (pfsync_update_state_ptr != NULL)
5983                                 pfsync_update_state_ptr(s);
5984                         r = s->rule.ptr;
5985                         a = s->anchor.ptr;
5986                         log = s->log;
5987                 } else if (s == NULL)
5988                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5989                             &a, &ruleset, inp);
5990                 break;
5991         }
5992
5993         case IPPROTO_ICMP: {
5994                 struct icmp     ih;
5995
5996                 pd.hdr.icmp = &ih;
5997                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5998                     &action, &reason, AF_INET)) {
5999                         log = action != PF_PASS;
6000                         goto done;
6001                 }
6002                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6003                     &reason);
6004                 if (action == PF_PASS) {
6005                         if (pfsync_update_state_ptr != NULL)
6006                                 pfsync_update_state_ptr(s);
6007                         r = s->rule.ptr;
6008                         a = s->anchor.ptr;
6009                         log = s->log;
6010                 } else if (s == NULL)
6011                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6012                             &a, &ruleset, inp);
6013                 break;
6014         }
6015
6016 #ifdef INET6
6017         case IPPROTO_ICMPV6: {
6018                 action = PF_DROP;
6019                 DPFPRINTF(PF_DEBUG_MISC,
6020                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6021                 goto done;
6022         }
6023 #endif
6024
6025         default:
6026                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6027                 if (action == PF_PASS) {
6028                         if (pfsync_update_state_ptr != NULL)
6029                                 pfsync_update_state_ptr(s);
6030                         r = s->rule.ptr;
6031                         a = s->anchor.ptr;
6032                         log = s->log;
6033                 } else if (s == NULL)
6034                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6035                             &a, &ruleset, inp);
6036                 break;
6037         }
6038
6039 done:
6040         PF_RULES_RUNLOCK();
6041         if (action == PF_PASS && h->ip_hl > 5 &&
6042             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6043                 action = PF_DROP;
6044                 REASON_SET(&reason, PFRES_IPOPTIONS);
6045                 log = r->log;
6046                 DPFPRINTF(PF_DEBUG_MISC,
6047                     ("pf: dropping packet with ip options\n"));
6048         }
6049
6050         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6051                 action = PF_DROP;
6052                 REASON_SET(&reason, PFRES_MEMORY);
6053         }
6054         if (r->rtableid >= 0)
6055                 M_SETFIB(m, r->rtableid);
6056
6057         if (r->scrub_flags & PFSTATE_SETPRIO) {
6058                 if (pd.tos & IPTOS_LOWDELAY)
6059                         pqid = 1;
6060                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6061                         action = PF_DROP;
6062                         REASON_SET(&reason, PFRES_MEMORY);
6063                         log = 1;
6064                         DPFPRINTF(PF_DEBUG_MISC,
6065                             ("pf: failed to allocate 802.1q mtag\n"));
6066                 }
6067         }
6068
6069 #ifdef ALTQ
6070         if (action == PF_PASS && r->qid) {
6071                 if (pd.pf_mtag == NULL &&
6072                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6073                         action = PF_DROP;
6074                         REASON_SET(&reason, PFRES_MEMORY);
6075                 } else {
6076                         if (s != NULL)
6077                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6078                         if (pqid || (pd.tos & IPTOS_LOWDELAY))
6079                                 pd.pf_mtag->qid = r->pqid;
6080                         else
6081                                 pd.pf_mtag->qid = r->qid;
6082                         /* Add hints for ecn. */
6083                         pd.pf_mtag->hdr = h;
6084                 }
6085
6086         }
6087 #endif /* ALTQ */
6088
6089         /*
6090          * connections redirected to loopback should not match sockets
6091          * bound specifically to loopback due to security implications,
6092          * see tcp_input() and in_pcblookup_listen().
6093          */
6094         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6095             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6096             (s->nat_rule.ptr->action == PF_RDR ||
6097             s->nat_rule.ptr->action == PF_BINAT) &&
6098             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6099                 m->m_flags |= M_SKIP_FIREWALL;
6100
6101         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
6102             !PACKET_LOOPED(&pd)) {
6103
6104                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
6105                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
6106                 if (ipfwtag != NULL) {
6107                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
6108                             ntohs(r->divert.port);
6109                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
6110
6111                         if (s)
6112                                 PF_STATE_UNLOCK(s);
6113
6114                         m_tag_prepend(m, ipfwtag);
6115                         if (m->m_flags & M_FASTFWD_OURS) {
6116                                 if (pd.pf_mtag == NULL &&
6117                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6118                                         action = PF_DROP;
6119                                         REASON_SET(&reason, PFRES_MEMORY);
6120                                         log = 1;
6121                                         DPFPRINTF(PF_DEBUG_MISC,
6122                                             ("pf: failed to allocate tag\n"));
6123                                 } else {
6124                                         pd.pf_mtag->flags |=
6125                                             PF_FASTFWD_OURS_PRESENT;
6126                                         m->m_flags &= ~M_FASTFWD_OURS;
6127                                 }
6128                         }
6129                         ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
6130                         *m0 = NULL;
6131
6132                         return (action);
6133                 } else {
6134                         /* XXX: ipfw has the same behaviour! */
6135                         action = PF_DROP;
6136                         REASON_SET(&reason, PFRES_MEMORY);
6137                         log = 1;
6138                         DPFPRINTF(PF_DEBUG_MISC,
6139                             ("pf: failed to allocate divert tag\n"));
6140                 }
6141         }
6142
6143         if (log) {
6144                 struct pf_rule *lr;
6145
6146                 if (s != NULL && s->nat_rule.ptr != NULL &&
6147                     s->nat_rule.ptr->log & PF_LOG_ALL)
6148                         lr = s->nat_rule.ptr;
6149                 else
6150                         lr = r;
6151                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6152                     (s == NULL));
6153         }
6154
6155         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6156         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6157
6158         if (action == PF_PASS || r->action == PF_DROP) {
6159                 dirndx = (dir == PF_OUT);
6160                 r->packets[dirndx]++;
6161                 r->bytes[dirndx] += pd.tot_len;
6162                 if (a != NULL) {
6163                         a->packets[dirndx]++;
6164                         a->bytes[dirndx] += pd.tot_len;
6165                 }
6166                 if (s != NULL) {
6167                         if (s->nat_rule.ptr != NULL) {
6168                                 s->nat_rule.ptr->packets[dirndx]++;
6169                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6170                         }
6171                         if (s->src_node != NULL) {
6172                                 s->src_node->packets[dirndx]++;
6173                                 s->src_node->bytes[dirndx] += pd.tot_len;
6174                         }
6175                         if (s->nat_src_node != NULL) {
6176                                 s->nat_src_node->packets[dirndx]++;
6177                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6178                         }
6179                         dirndx = (dir == s->direction) ? 0 : 1;
6180                         s->packets[dirndx]++;
6181                         s->bytes[dirndx] += pd.tot_len;
6182                 }
6183                 tr = r;
6184                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6185                 if (nr != NULL && r == &V_pf_default_rule)
6186                         tr = nr;
6187                 if (tr->src.addr.type == PF_ADDR_TABLE)
6188                         pfr_update_stats(tr->src.addr.p.tbl,
6189                             (s == NULL) ? pd.src :
6190                             &s->key[(s->direction == PF_IN)]->
6191                                 addr[(s->direction == PF_OUT)],
6192                             pd.af, pd.tot_len, dir == PF_OUT,
6193                             r->action == PF_PASS, tr->src.neg);
6194                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6195                         pfr_update_stats(tr->dst.addr.p.tbl,
6196                             (s == NULL) ? pd.dst :
6197                             &s->key[(s->direction == PF_IN)]->
6198                                 addr[(s->direction == PF_IN)],
6199                             pd.af, pd.tot_len, dir == PF_OUT,
6200                             r->action == PF_PASS, tr->dst.neg);
6201         }
6202
6203         switch (action) {
6204         case PF_SYNPROXY_DROP:
6205                 m_freem(*m0);
6206         case PF_DEFER:
6207                 *m0 = NULL;
6208                 action = PF_PASS;
6209                 break;
6210         case PF_DROP:
6211                 m_freem(*m0);
6212                 *m0 = NULL;
6213                 break;
6214         default:
6215                 /* pf_route() returns unlocked. */
6216                 if (r->rt) {
6217                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6218                         return (action);
6219                 }
6220                 break;
6221         }
6222         if (s)
6223                 PF_STATE_UNLOCK(s);
6224
6225         return (action);
6226 }
6227 #endif /* INET */
6228
6229 #ifdef INET6
6230 int
6231 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6232 {
6233         struct pfi_kif          *kif;
6234         u_short                  action, reason = 0, log = 0;
6235         struct mbuf             *m = *m0, *n = NULL;
6236         struct m_tag            *mtag;
6237         struct ip6_hdr          *h = NULL;
6238         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6239         struct pf_state         *s = NULL;
6240         struct pf_ruleset       *ruleset = NULL;
6241         struct pf_pdesc          pd;
6242         int                      off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
6243         int                      fwdir = dir;
6244
6245         M_ASSERTPKTHDR(m);
6246
6247         /* Detect packet forwarding.
6248          * If the input interface is different from the output interface we're
6249          * forwarding.
6250          * We do need to be careful about bridges. If the
6251          * net.link.bridge.pfil_bridge sysctl is set we can be filtering on a
6252          * bridge, so if the input interface is a bridge member and the output
6253          * interface is its bridge or a member of the same bridge we're not
6254          * actually forwarding but bridging.
6255          */
6256         if (dir == PF_OUT && m->m_pkthdr.rcvif && ifp != m->m_pkthdr.rcvif &&
6257             (m->m_pkthdr.rcvif->if_bridge == NULL ||
6258             (m->m_pkthdr.rcvif->if_bridge != ifp->if_softc &&
6259             m->m_pkthdr.rcvif->if_bridge != ifp->if_bridge)))
6260                 fwdir = PF_FWD;
6261
6262         if (!V_pf_status.running)
6263                 return (PF_PASS);
6264
6265         memset(&pd, 0, sizeof(pd));
6266         pd.pf_mtag = pf_find_mtag(m);
6267
6268         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6269                 return (PF_PASS);
6270
6271         kif = (struct pfi_kif *)ifp->if_pf_kif;
6272         if (kif == NULL) {
6273                 DPFPRINTF(PF_DEBUG_URGENT,
6274                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6275                 return (PF_DROP);
6276         }
6277         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6278                 return (PF_PASS);
6279
6280         if (m->m_flags & M_SKIP_FIREWALL)
6281                 return (PF_PASS);
6282
6283         PF_RULES_RLOCK();
6284
6285         /* We do IP header normalization and packet reassembly here */
6286         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6287                 action = PF_DROP;
6288                 goto done;
6289         }
6290         m = *m0;        /* pf_normalize messes with m0 */
6291         h = mtod(m, struct ip6_hdr *);
6292
6293 #if 1
6294         /*
6295          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6296          * will do something bad, so drop the packet for now.
6297          */
6298         if (htons(h->ip6_plen) == 0) {
6299                 action = PF_DROP;
6300                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6301                 goto done;
6302         }
6303 #endif
6304
6305         pd.src = (struct pf_addr *)&h->ip6_src;
6306         pd.dst = (struct pf_addr *)&h->ip6_dst;
6307         pd.sport = pd.dport = NULL;
6308         pd.ip_sum = NULL;
6309         pd.proto_sum = NULL;
6310         pd.dir = dir;
6311         pd.sidx = (dir == PF_IN) ? 0 : 1;
6312         pd.didx = (dir == PF_IN) ? 1 : 0;
6313         pd.af = AF_INET6;
6314         pd.tos = 0;
6315         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6316
6317         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6318         pd.proto = h->ip6_nxt;
6319         do {
6320                 switch (pd.proto) {
6321                 case IPPROTO_FRAGMENT:
6322                         action = pf_test_fragment(&r, dir, kif, m, h,
6323                             &pd, &a, &ruleset);
6324                         if (action == PF_DROP)
6325                                 REASON_SET(&reason, PFRES_FRAG);
6326                         goto done;
6327                 case IPPROTO_ROUTING: {
6328                         struct ip6_rthdr rthdr;
6329
6330                         if (rh_cnt++) {
6331                                 DPFPRINTF(PF_DEBUG_MISC,
6332                                     ("pf: IPv6 more than one rthdr\n"));
6333                                 action = PF_DROP;
6334                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6335                                 log = 1;
6336                                 goto done;
6337                         }
6338                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6339                             &reason, pd.af)) {
6340                                 DPFPRINTF(PF_DEBUG_MISC,
6341                                     ("pf: IPv6 short rthdr\n"));
6342                                 action = PF_DROP;
6343                                 REASON_SET(&reason, PFRES_SHORT);
6344                                 log = 1;
6345                                 goto done;
6346                         }
6347                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6348                                 DPFPRINTF(PF_DEBUG_MISC,
6349                                     ("pf: IPv6 rthdr0\n"));
6350                                 action = PF_DROP;
6351                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6352                                 log = 1;
6353                                 goto done;
6354                         }
6355                         /* FALLTHROUGH */
6356                 }
6357                 case IPPROTO_AH:
6358                 case IPPROTO_HOPOPTS:
6359                 case IPPROTO_DSTOPTS: {
6360                         /* get next header and header length */
6361                         struct ip6_ext  opt6;
6362
6363                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6364                             NULL, &reason, pd.af)) {
6365                                 DPFPRINTF(PF_DEBUG_MISC,
6366                                     ("pf: IPv6 short opt\n"));
6367                                 action = PF_DROP;
6368                                 log = 1;
6369                                 goto done;
6370                         }
6371                         if (pd.proto == IPPROTO_AH)
6372                                 off += (opt6.ip6e_len + 2) * 4;
6373                         else
6374                                 off += (opt6.ip6e_len + 1) * 8;
6375                         pd.proto = opt6.ip6e_nxt;
6376                         /* goto the next header */
6377                         break;
6378                 }
6379                 default:
6380                         terminal++;
6381                         break;
6382                 }
6383         } while (!terminal);
6384
6385         /* if there's no routing header, use unmodified mbuf for checksumming */
6386         if (!n)
6387                 n = m;
6388
6389         switch (pd.proto) {
6390
6391         case IPPROTO_TCP: {
6392                 struct tcphdr   th;
6393
6394                 pd.hdr.tcp = &th;
6395                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6396                     &action, &reason, AF_INET6)) {
6397                         log = action != PF_PASS;
6398                         goto done;
6399                 }
6400                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6401                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6402                 if (action == PF_DROP)
6403                         goto done;
6404                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6405                     &reason);
6406                 if (action == PF_PASS) {
6407                         if (pfsync_update_state_ptr != NULL)
6408                                 pfsync_update_state_ptr(s);
6409                         r = s->rule.ptr;
6410                         a = s->anchor.ptr;
6411                         log = s->log;
6412                 } else if (s == NULL)
6413                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6414                             &a, &ruleset, inp);
6415                 break;
6416         }
6417
6418         case IPPROTO_UDP: {
6419                 struct udphdr   uh;
6420
6421                 pd.hdr.udp = &uh;
6422                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6423                     &action, &reason, AF_INET6)) {
6424                         log = action != PF_PASS;
6425                         goto done;
6426                 }
6427                 if (uh.uh_dport == 0 ||
6428                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6429                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6430                         action = PF_DROP;
6431                         REASON_SET(&reason, PFRES_SHORT);
6432                         goto done;
6433                 }
6434                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6435                 if (action == PF_PASS) {
6436                         if (pfsync_update_state_ptr != NULL)
6437                                 pfsync_update_state_ptr(s);
6438                         r = s->rule.ptr;
6439                         a = s->anchor.ptr;
6440                         log = s->log;
6441                 } else if (s == NULL)
6442                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6443                             &a, &ruleset, inp);
6444                 break;
6445         }
6446
6447         case IPPROTO_ICMP: {
6448                 action = PF_DROP;
6449                 DPFPRINTF(PF_DEBUG_MISC,
6450                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6451                 goto done;
6452         }
6453
6454         case IPPROTO_ICMPV6: {
6455                 struct icmp6_hdr        ih;
6456
6457                 pd.hdr.icmp6 = &ih;
6458                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6459                     &action, &reason, AF_INET6)) {
6460                         log = action != PF_PASS;
6461                         goto done;
6462                 }
6463                 action = pf_test_state_icmp(&s, dir, kif,
6464                     m, off, h, &pd, &reason);
6465                 if (action == PF_PASS) {
6466                         if (pfsync_update_state_ptr != NULL)
6467                                 pfsync_update_state_ptr(s);
6468                         r = s->rule.ptr;
6469                         a = s->anchor.ptr;
6470                         log = s->log;
6471                 } else if (s == NULL)
6472                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6473                             &a, &ruleset, inp);
6474                 break;
6475         }
6476
6477         default:
6478                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6479                 if (action == PF_PASS) {
6480                         if (pfsync_update_state_ptr != NULL)
6481                                 pfsync_update_state_ptr(s);
6482                         r = s->rule.ptr;
6483                         a = s->anchor.ptr;
6484                         log = s->log;
6485                 } else if (s == NULL)
6486                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6487                             &a, &ruleset, inp);
6488                 break;
6489         }
6490
6491 done:
6492         PF_RULES_RUNLOCK();
6493         if (n != m) {
6494                 m_freem(n);
6495                 n = NULL;
6496         }
6497
6498         /* handle dangerous IPv6 extension headers. */
6499         if (action == PF_PASS && rh_cnt &&
6500             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6501                 action = PF_DROP;
6502                 REASON_SET(&reason, PFRES_IPOPTIONS);
6503                 log = r->log;
6504                 DPFPRINTF(PF_DEBUG_MISC,
6505                     ("pf: dropping packet with dangerous v6 headers\n"));
6506         }
6507
6508         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6509                 action = PF_DROP;
6510                 REASON_SET(&reason, PFRES_MEMORY);
6511         }
6512         if (r->rtableid >= 0)
6513                 M_SETFIB(m, r->rtableid);
6514
6515         if (r->scrub_flags & PFSTATE_SETPRIO) {
6516                 if (pd.tos & IPTOS_LOWDELAY)
6517                         pqid = 1;
6518                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6519                         action = PF_DROP;
6520                         REASON_SET(&reason, PFRES_MEMORY);
6521                         log = 1;
6522                         DPFPRINTF(PF_DEBUG_MISC,
6523                             ("pf: failed to allocate 802.1q mtag\n"));
6524                 }
6525         }
6526
6527 #ifdef ALTQ
6528         if (action == PF_PASS && r->qid) {
6529                 if (pd.pf_mtag == NULL &&
6530                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6531                         action = PF_DROP;
6532                         REASON_SET(&reason, PFRES_MEMORY);
6533                 } else {
6534                         if (s != NULL)
6535                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6536                         if (pd.tos & IPTOS_LOWDELAY)
6537                                 pd.pf_mtag->qid = r->pqid;
6538                         else
6539                                 pd.pf_mtag->qid = r->qid;
6540                         /* Add hints for ecn. */
6541                         pd.pf_mtag->hdr = h;
6542                 }
6543         }
6544 #endif /* ALTQ */
6545
6546         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6547             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6548             (s->nat_rule.ptr->action == PF_RDR ||
6549             s->nat_rule.ptr->action == PF_BINAT) &&
6550             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6551                 m->m_flags |= M_SKIP_FIREWALL;
6552
6553         /* XXX: Anybody working on it?! */
6554         if (r->divert.port)
6555                 printf("pf: divert(9) is not supported for IPv6\n");
6556
6557         if (log) {
6558                 struct pf_rule *lr;
6559
6560                 if (s != NULL && s->nat_rule.ptr != NULL &&
6561                     s->nat_rule.ptr->log & PF_LOG_ALL)
6562                         lr = s->nat_rule.ptr;
6563                 else
6564                         lr = r;
6565                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6566                     &pd, (s == NULL));
6567         }
6568
6569         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6570         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6571
6572         if (action == PF_PASS || r->action == PF_DROP) {
6573                 dirndx = (dir == PF_OUT);
6574                 r->packets[dirndx]++;
6575                 r->bytes[dirndx] += pd.tot_len;
6576                 if (a != NULL) {
6577                         a->packets[dirndx]++;
6578                         a->bytes[dirndx] += pd.tot_len;
6579                 }
6580                 if (s != NULL) {
6581                         if (s->nat_rule.ptr != NULL) {
6582                                 s->nat_rule.ptr->packets[dirndx]++;
6583                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6584                         }
6585                         if (s->src_node != NULL) {
6586                                 s->src_node->packets[dirndx]++;
6587                                 s->src_node->bytes[dirndx] += pd.tot_len;
6588                         }
6589                         if (s->nat_src_node != NULL) {
6590                                 s->nat_src_node->packets[dirndx]++;
6591                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6592                         }
6593                         dirndx = (dir == s->direction) ? 0 : 1;
6594                         s->packets[dirndx]++;
6595                         s->bytes[dirndx] += pd.tot_len;
6596                 }
6597                 tr = r;
6598                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6599                 if (nr != NULL && r == &V_pf_default_rule)
6600                         tr = nr;
6601                 if (tr->src.addr.type == PF_ADDR_TABLE)
6602                         pfr_update_stats(tr->src.addr.p.tbl,
6603                             (s == NULL) ? pd.src :
6604                             &s->key[(s->direction == PF_IN)]->addr[0],
6605                             pd.af, pd.tot_len, dir == PF_OUT,
6606                             r->action == PF_PASS, tr->src.neg);
6607                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6608                         pfr_update_stats(tr->dst.addr.p.tbl,
6609                             (s == NULL) ? pd.dst :
6610                             &s->key[(s->direction == PF_IN)]->addr[1],
6611                             pd.af, pd.tot_len, dir == PF_OUT,
6612                             r->action == PF_PASS, tr->dst.neg);
6613         }
6614
6615         switch (action) {
6616         case PF_SYNPROXY_DROP:
6617                 m_freem(*m0);
6618         case PF_DEFER:
6619                 *m0 = NULL;
6620                 action = PF_PASS;
6621                 break;
6622         case PF_DROP:
6623                 m_freem(*m0);
6624                 *m0 = NULL;
6625                 break;
6626         default:
6627                 /* pf_route6() returns unlocked. */
6628                 if (r->rt) {
6629                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6630                         return (action);
6631                 }
6632                 break;
6633         }
6634
6635         if (s)
6636                 PF_STATE_UNLOCK(s);
6637
6638         /* If reassembled packet passed, create new fragments. */
6639         if (action == PF_PASS && *m0 && fwdir == PF_FWD &&
6640             (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
6641                 action = pf_refragment6(ifp, m0, mtag);
6642
6643         return (action);
6644 }
6645 #endif /* INET6 */