sys/netpfil/pf/pf.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2001 Daniel Hartmeier
   5  * Copyright (c) 2002 - 2008 Henning Brauer
   6  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  *    - Redistributions of source code must retain the above copyright
  14  *      notice, this list of conditions and the following disclaimer.
  15  *    - Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials provided
  18  *      with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * Effort sponsored in part by the Defense Advanced Research Projects
  34  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  35  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  36  *
  37  *      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_bpf.h"
  46 #include "opt_pf.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/bus.h>
  50 #include <sys/endian.h>
  51 #include <sys/gsb_crc32.h>
  52 #include <sys/hash.h>
  53 #include <sys/interrupt.h>
  54 #include <sys/kernel.h>
  55 #include <sys/kthread.h>
  56 #include <sys/limits.h>
  57 #include <sys/mbuf.h>
  58 #include <sys/md5.h>
  59 #include <sys/random.h>
  60 #include <sys/refcount.h>
  61 #include <sys/socket.h>
  62 #include <sys/sysctl.h>
  63 #include <sys/taskqueue.h>
  64 #include <sys/ucred.h>
  65
  66 #include <net/if.h>
  67 #include <net/if_var.h>
  68 #include <net/if_types.h>
  69 #include <net/if_vlan_var.h>
  70 #include <net/route.h>
  71 #include <net/radix_mpath.h>
  72 #include <net/vnet.h>
  73
  74 #include <net/pfil.h>
  75 #include <net/pfvar.h>
  76 #include <net/if_pflog.h>
  77 #include <net/if_pfsync.h>
  78
  79 #include <netinet/in_pcb.h>
  80 #include <netinet/in_var.h>
  81 #include <netinet/in_fib.h>
  82 #include <netinet/ip.h>
  83 #include <netinet/ip_fw.h>
  84 #include <netinet/ip_icmp.h>
  85 #include <netinet/icmp_var.h>
  86 #include <netinet/ip_var.h>
  87 #include <netinet/tcp.h>
  88 #include <netinet/tcp_fsm.h>
  89 #include <netinet/tcp_seq.h>
  90 #include <netinet/tcp_timer.h>
  91 #include <netinet/tcp_var.h>
  92 #include <netinet/udp.h>
  93 #include <netinet/udp_var.h>
  94
  95 #ifdef INET6
  96 #include <netinet/ip6.h>
  97 #include <netinet/icmp6.h>
  98 #include <netinet6/nd6.h>
  99 #include <netinet6/ip6_var.h>
 100 #include <netinet6/in6_pcb.h>
 101 #include <netinet6/in6_fib.h>
 102 #include <netinet6/scope6_var.h>
 103 #endif /* INET6 */
 104
 105 #include <machine/in_cksum.h>
 106 #include <security/mac/mac_framework.h>
 107
 108 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 109
 110 /*
 111  * Global variables
 112  */
 113
 114 /* state tables */
 115 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[4]);
 116 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 117 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 118 VNET_DEFINE(struct pf_altqqueue *,       pf_altq_ifs_active);
 119 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 120 VNET_DEFINE(struct pf_altqqueue *,       pf_altq_ifs_inactive);
 121 VNET_DEFINE(struct pf_kstatus,           pf_status);
 122
 123 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 124 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 125 VNET_DEFINE(int,                         altqs_inactive_open);
 126 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 127
 128 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 129 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 130 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 131 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 132 VNET_DEFINE(int,                         pf_tcp_secret_init);
 133 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 134 VNET_DEFINE(int,                         pf_tcp_iss_off);
 135 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 136 VNET_DECLARE(int,                        pf_vnet_active);
 137 #define V_pf_vnet_active                 VNET(pf_vnet_active)
 138
 139 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx);
 140 #define V_pf_purge_idx  VNET(pf_purge_idx)
 141
 142 /*
 143  * Queue for pf_intr() sends.
 144  */
 145 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 146 struct pf_send_entry {
 147         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 148         struct mbuf                     *pfse_m;
 149         enum {
 150                 PFSE_IP,
 151                 PFSE_IP6,
 152                 PFSE_ICMP,
 153                 PFSE_ICMP6,
 154         }                               pfse_type;
 155         struct {
 156                 int             type;
 157                 int             code;
 158                 int             mtu;
 159         } icmpopts;
 160 };
 161
 162 STAILQ_HEAD(pf_send_head, pf_send_entry);
 163 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue);
 164 #define V_pf_sendqueue  VNET(pf_sendqueue)
 165
 166 static struct mtx pf_sendqueue_mtx;
 167 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
 168 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 169 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 170
 171 /*
 172  * Queue for pf_overload_task() tasks.
 173  */
 174 struct pf_overload_entry {
 175         SLIST_ENTRY(pf_overload_entry)  next;
 176         struct pf_addr                  addr;
 177         sa_family_t                     af;
 178         uint8_t                         dir;
 179         struct pf_rule                  *rule;
 180 };
 181
 182 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 183 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue);
 184 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 185 VNET_DEFINE_STATIC(struct task, pf_overloadtask);
 186 #define V_pf_overloadtask       VNET(pf_overloadtask)
 187
 188 static struct mtx pf_overloadqueue_mtx;
 189 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
 190     "pf overload/flush queue", MTX_DEF);
 191 #define PF_OVERLOADQ_LOCK()     mtx_lock(&pf_overloadqueue_mtx)
 192 #define PF_OVERLOADQ_UNLOCK()   mtx_unlock(&pf_overloadqueue_mtx)
 193
 194 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules);
 195 struct mtx pf_unlnkdrules_mtx;
 196 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
 197     MTX_DEF);
 198
 199 VNET_DEFINE_STATIC(uma_zone_t,  pf_sources_z);
 200 #define V_pf_sources_z  VNET(pf_sources_z)
 201 uma_zone_t              pf_mtag_z;
 202 VNET_DEFINE(uma_zone_t,  pf_state_z);
 203 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 204
 205 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 206 #define PFID_CPUBITS    8
 207 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 208 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 209 #define PFID_MAXID      (~PFID_CPUMASK)
 210 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU);
 211
 212 static void              pf_src_tree_remove_state(struct pf_state *);
 213 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 214                             u_int32_t);
 215 static void              pf_add_threshold(struct pf_threshold *);
 216 static int               pf_check_threshold(struct pf_threshold *);
 217
 218 static void              pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 219                             u_int16_t *, u_int16_t *, struct pf_addr *,
 220                             u_int16_t, u_int8_t, sa_family_t);
 221 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 222                             struct tcphdr *, struct pf_state_peer *);
 223 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 224                             struct pf_addr *, struct pf_addr *, u_int16_t,
 225                             u_int16_t *, u_int16_t *, u_int16_t *,
 226                             u_int16_t *, u_int8_t, sa_family_t);
 227 static void              pf_send_tcp(struct mbuf *,
 228                             const struct pf_rule *, sa_family_t,
 229                             const struct pf_addr *, const struct pf_addr *,
 230                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 231                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 232                             u_int16_t, struct ifnet *);
 233 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 234                             sa_family_t, struct pf_rule *);
 235 static void              pf_detach_state(struct pf_state *);
 236 static int               pf_state_key_attach(struct pf_state_key *,
 237                             struct pf_state_key *, struct pf_state *);
 238 static void              pf_state_key_detach(struct pf_state *, int);
 239 static int               pf_state_key_ctor(void *, int, void *, int);
 240 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 241 static int               pf_test_rule(struct pf_rule **, struct pf_state **,
 242                             int, struct pfi_kif *, struct mbuf *, int,
 243                             struct pf_pdesc *, struct pf_rule **,
 244                             struct pf_ruleset **, struct inpcb *);
 245 static int               pf_create_state(struct pf_rule *, struct pf_rule *,
 246                             struct pf_rule *, struct pf_pdesc *,
 247                             struct pf_src_node *, struct pf_state_key *,
 248                             struct pf_state_key *, struct mbuf *, int,
 249                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 250                             struct pf_state **, int, u_int16_t, u_int16_t,
 251                             int);
 252 static int               pf_test_fragment(struct pf_rule **, int,
 253                             struct pfi_kif *, struct mbuf *, void *,
 254                             struct pf_pdesc *, struct pf_rule **,
 255                             struct pf_ruleset **);
 256 static int               pf_tcp_track_full(struct pf_state_peer *,
 257                             struct pf_state_peer *, struct pf_state **,
 258                             struct pfi_kif *, struct mbuf *, int,
 259                             struct pf_pdesc *, u_short *, int *);
 260 static int               pf_tcp_track_sloppy(struct pf_state_peer *,
 261                             struct pf_state_peer *, struct pf_state **,
 262                             struct pf_pdesc *, u_short *);
 263 static int               pf_test_state_tcp(struct pf_state **, int,
 264                             struct pfi_kif *, struct mbuf *, int,
 265                             void *, struct pf_pdesc *, u_short *);
 266 static int               pf_test_state_udp(struct pf_state **, int,
 267                             struct pfi_kif *, struct mbuf *, int,
 268                             void *, struct pf_pdesc *);
 269 static int               pf_test_state_icmp(struct pf_state **, int,
 270                             struct pfi_kif *, struct mbuf *, int,
 271                             void *, struct pf_pdesc *, u_short *);
 272 static int               pf_test_state_other(struct pf_state **, int,
 273                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 274 static u_int8_t          pf_get_wscale(struct mbuf *, int, u_int16_t,
 275                             sa_family_t);
 276 static u_int16_t         pf_get_mss(struct mbuf *, int, u_int16_t,
 277                             sa_family_t);
 278 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 279                                 int, u_int16_t);
 280 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 281                             u_int8_t, sa_family_t);
 282 static void              pf_print_state_parts(struct pf_state *,
 283                             struct pf_state_key *, struct pf_state_key *);
 284 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 285                             struct pf_addr_wrap *);
 286 static struct pf_state  *pf_find_state(struct pfi_kif *,
 287                             struct pf_state_key_cmp *, u_int);
 288 static int               pf_src_connlimit(struct pf_state **);
 289 static void              pf_overload_task(void *v, int pending);
 290 static int               pf_insert_src_node(struct pf_src_node **,
 291                             struct pf_rule *, struct pf_addr *, sa_family_t);
 292 static u_int             pf_purge_expired_states(u_int, int);
 293 static void              pf_purge_unlinked_rules(void);
 294 static int               pf_mtag_uminit(void *, int, int);
 295 static void              pf_mtag_free(struct m_tag *);
 296 #ifdef INET
 297 static void              pf_route(struct mbuf **, struct pf_rule *, int,
 298                             struct ifnet *, struct pf_state *,
 299                             struct pf_pdesc *, struct inpcb *);
 300 #endif /* INET */
 301 #ifdef INET6
 302 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 303                             struct pf_addr *, u_int8_t);
 304 static void              pf_route6(struct mbuf **, struct pf_rule *, int,
 305                             struct ifnet *, struct pf_state *,
 306                             struct pf_pdesc *, struct inpcb *);
 307 #endif /* INET6 */
 308
 309 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 310
 311 extern int pf_end_threads;
 312 extern struct proc *pf_purge_proc;
 313
 314 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 315
 316 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 317                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 318
 319 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 320         do {                                                            \
 321                 (s) = pf_find_state((i), (k), (d));                     \
 322                 if ((s) == NULL)                                        \
 323                         return (PF_DROP);                               \
 324                 if (PACKET_LOOPED(pd))                                  \
 325                         return (PF_PASS);                               \
 326                 if ((d) == PF_OUT &&                                    \
 327                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 328                     (s)->rule.ptr->direction == PF_OUT) ||              \
 329                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 330                     (s)->rule.ptr->direction == PF_IN)) &&              \
 331                     (s)->rt_kif != NULL &&                              \
 332                     (s)->rt_kif != (i))                                 \
 333                         return (PF_PASS);                               \
 334         } while (0)
 335
 336 #define BOUND_IFACE(r, k) \
 337         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 338
 339 #define STATE_INC_COUNTERS(s)                                           \
 340         do {                                                            \
 341                 counter_u64_add(s->rule.ptr->states_cur, 1);            \
 342                 counter_u64_add(s->rule.ptr->states_tot, 1);            \
 343                 if (s->anchor.ptr != NULL) {                            \
 344                         counter_u64_add(s->anchor.ptr->states_cur, 1);  \
 345                         counter_u64_add(s->anchor.ptr->states_tot, 1);  \
 346                 }                                                       \
 347                 if (s->nat_rule.ptr != NULL) {                          \
 348                         counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
 349                         counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
 350                 }                                                       \
 351         } while (0)
 352
 353 #define STATE_DEC_COUNTERS(s)                                           \
 354         do {                                                            \
 355                 if (s->nat_rule.ptr != NULL)                            \
 356                         counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
 357                 if (s->anchor.ptr != NULL)                              \
 358                         counter_u64_add(s->anchor.ptr->states_cur, -1); \
 359                 counter_u64_add(s->rule.ptr->states_cur, -1);           \
 360         } while (0)
 361
 362 MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 363 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 364 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 365 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 366
 367 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
 368
 369 u_long  pf_hashmask;
 370 u_long  pf_srchashmask;
 371 static u_long   pf_hashsize;
 372 static u_long   pf_srchashsize;
 373 u_long  pf_ioctl_maxcount = 65535;
 374
 375 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 376     &pf_hashsize, 0, "Size of pf(4) states hashtable");
 377 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 378     &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
 379 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RDTUN,
 380     &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call");
 381
 382 VNET_DEFINE(void *, pf_swi_cookie);
 383
 384 VNET_DEFINE(uint32_t, pf_hashseed);
 385 #define V_pf_hashseed   VNET(pf_hashseed)
 386
 387 int
 388 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
 389 {
 390
 391         switch (af) {
 392 #ifdef INET
 393         case AF_INET:
 394                 if (a->addr32[0] > b->addr32[0])
 395                         return (1);
 396                 if (a->addr32[0] < b->addr32[0])
 397                         return (-1);
 398                 break;
 399 #endif /* INET */
 400 #ifdef INET6
 401         case AF_INET6:
 402                 if (a->addr32[3] > b->addr32[3])
 403                         return (1);
 404                 if (a->addr32[3] < b->addr32[3])
 405                         return (-1);
 406                 if (a->addr32[2] > b->addr32[2])
 407                         return (1);
 408                 if (a->addr32[2] < b->addr32[2])
 409                         return (-1);
 410                 if (a->addr32[1] > b->addr32[1])
 411                         return (1);
 412                 if (a->addr32[1] < b->addr32[1])
 413                         return (-1);
 414                 if (a->addr32[0] > b->addr32[0])
 415                         return (1);
 416                 if (a->addr32[0] < b->addr32[0])
 417                         return (-1);
 418                 break;
 419 #endif /* INET6 */
 420         default:
 421                 panic("%s: unknown address family %u", __func__, af);
 422         }
 423         return (0);
 424 }
 425
 426 static __inline uint32_t
 427 pf_hashkey(struct pf_state_key *sk)
 428 {
 429         uint32_t h;
 430
 431         h = murmur3_32_hash32((uint32_t *)sk,
 432             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 433             V_pf_hashseed);
 434
 435         return (h & pf_hashmask);
 436 }
 437
 438 static __inline uint32_t
 439 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 440 {
 441         uint32_t h;
 442
 443         switch (af) {
 444         case AF_INET:
 445                 h = murmur3_32_hash32((uint32_t *)&addr->v4,
 446                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 447                 break;
 448         case AF_INET6:
 449                 h = murmur3_32_hash32((uint32_t *)&addr->v6,
 450                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 451                 break;
 452         default:
 453                 panic("%s: unknown address family %u", __func__, af);
 454         }
 455
 456         return (h & pf_srchashmask);
 457 }
 458
 459 #ifdef ALTQ
 460 static int
 461 pf_state_hash(struct pf_state *s)
 462 {
 463         u_int32_t hv = (intptr_t)s / sizeof(*s);
 464
 465         hv ^= crc32(&s->src, sizeof(s->src));
 466         hv ^= crc32(&s->dst, sizeof(s->dst));
 467         if (hv == 0)
 468                 hv = 1;
 469         return (hv);
 470 }
 471 #endif
 472
 473 #ifdef INET6
 474 void
 475 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 476 {
 477         switch (af) {
 478 #ifdef INET
 479         case AF_INET:
 480                 dst->addr32[0] = src->addr32[0];
 481                 break;
 482 #endif /* INET */
 483         case AF_INET6:
 484                 dst->addr32[0] = src->addr32[0];
 485                 dst->addr32[1] = src->addr32[1];
 486                 dst->addr32[2] = src->addr32[2];
 487                 dst->addr32[3] = src->addr32[3];
 488                 break;
 489         }
 490 }
 491 #endif /* INET6 */
 492
 493 static void
 494 pf_init_threshold(struct pf_threshold *threshold,
 495     u_int32_t limit, u_int32_t seconds)
 496 {
 497         threshold->limit = limit * PF_THRESHOLD_MULT;
 498         threshold->seconds = seconds;
 499         threshold->count = 0;
 500         threshold->last = time_uptime;
 501 }
 502
 503 static void
 504 pf_add_threshold(struct pf_threshold *threshold)
 505 {
 506         u_int32_t t = time_uptime, diff = t - threshold->last;
 507
 508         if (diff >= threshold->seconds)
 509                 threshold->count = 0;
 510         else
 511                 threshold->count -= threshold->count * diff /
 512                     threshold->seconds;
 513         threshold->count += PF_THRESHOLD_MULT;
 514         threshold->last = t;
 515 }
 516
 517 static int
 518 pf_check_threshold(struct pf_threshold *threshold)
 519 {
 520         return (threshold->count > threshold->limit);
 521 }
 522
 523 static int
 524 pf_src_connlimit(struct pf_state **state)
 525 {
 526         struct pf_overload_entry *pfoe;
 527         int bad = 0;
 528
 529         PF_STATE_LOCK_ASSERT(*state);
 530
 531         (*state)->src_node->conn++;
 532         (*state)->src.tcp_est = 1;
 533         pf_add_threshold(&(*state)->src_node->conn_rate);
 534
 535         if ((*state)->rule.ptr->max_src_conn &&
 536             (*state)->rule.ptr->max_src_conn <
 537             (*state)->src_node->conn) {
 538                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
 539                 bad++;
 540         }
 541
 542         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 543             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 544                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
 545                 bad++;
 546         }
 547
 548         if (!bad)
 549                 return (0);
 550
 551         /* Kill this state. */
 552         (*state)->timeout = PFTM_PURGE;
 553         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 554
 555         if ((*state)->rule.ptr->overload_tbl == NULL)
 556                 return (1);
 557
 558         /* Schedule overloading and flushing task. */
 559         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 560         if (pfoe == NULL)
 561                 return (1);     /* too bad :( */
 562
 563         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 564         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 565         pfoe->rule = (*state)->rule.ptr;
 566         pfoe->dir = (*state)->direction;
 567         PF_OVERLOADQ_LOCK();
 568         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 569         PF_OVERLOADQ_UNLOCK();
 570         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 571
 572         return (1);
 573 }
 574
 575 static void
 576 pf_overload_task(void *v, int pending)
 577 {
 578         struct pf_overload_head queue;
 579         struct pfr_addr p;
 580         struct pf_overload_entry *pfoe, *pfoe1;
 581         uint32_t killed = 0;
 582
 583         CURVNET_SET((struct vnet *)v);
 584
 585         PF_OVERLOADQ_LOCK();
 586         queue = V_pf_overloadqueue;
 587         SLIST_INIT(&V_pf_overloadqueue);
 588         PF_OVERLOADQ_UNLOCK();
 589
 590         bzero(&p, sizeof(p));
 591         SLIST_FOREACH(pfoe, &queue, next) {
 592                 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
 593                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 594                         printf("%s: blocking address ", __func__);
 595                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 596                         printf("\n");
 597                 }
 598
 599                 p.pfra_af = pfoe->af;
 600                 switch (pfoe->af) {
 601 #ifdef INET
 602                 case AF_INET:
 603                         p.pfra_net = 32;
 604                         p.pfra_ip4addr = pfoe->addr.v4;
 605                         break;
 606 #endif
 607 #ifdef INET6
 608                 case AF_INET6:
 609                         p.pfra_net = 128;
 610                         p.pfra_ip6addr = pfoe->addr.v6;
 611                         break;
 612 #endif
 613                 }
 614
 615                 PF_RULES_WLOCK();
 616                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 617                 PF_RULES_WUNLOCK();
 618         }
 619
 620         /*
 621          * Remove those entries, that don't need flushing.
 622          */
 623         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 624                 if (pfoe->rule->flush == 0) {
 625                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 626                         free(pfoe, M_PFTEMP);
 627                 } else
 628                         counter_u64_add(
 629                             V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
 630
 631         /* If nothing to flush, return. */
 632         if (SLIST_EMPTY(&queue)) {
 633                 CURVNET_RESTORE();
 634                 return;
 635         }
 636
 637         for (int i = 0; i <= pf_hashmask; i++) {
 638                 struct pf_idhash *ih = &V_pf_idhash[i];
 639                 struct pf_state_key *sk;
 640                 struct pf_state *s;
 641
 642                 PF_HASHROW_LOCK(ih);
 643                 LIST_FOREACH(s, &ih->states, entry) {
 644                     sk = s->key[PF_SK_WIRE];
 645                     SLIST_FOREACH(pfoe, &queue, next)
 646                         if (sk->af == pfoe->af &&
 647                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 648                             pfoe->rule == s->rule.ptr) &&
 649                             ((pfoe->dir == PF_OUT &&
 650                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 651                             (pfoe->dir == PF_IN &&
 652                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 653                                 s->timeout = PFTM_PURGE;
 654                                 s->src.state = s->dst.state = TCPS_CLOSED;
 655                                 killed++;
 656                         }
 657                 }
 658                 PF_HASHROW_UNLOCK(ih);
 659         }
 660         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 661                 free(pfoe, M_PFTEMP);
 662         if (V_pf_status.debug >= PF_DEBUG_MISC)
 663                 printf("%s: %u states killed", __func__, killed);
 664
 665         CURVNET_RESTORE();
 666 }
 667
 668 /*
 669  * Can return locked on failure, so that we can consistently
 670  * allocate and insert a new one.
 671  */
 672 struct pf_src_node *
 673 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
 674         int returnlocked)
 675 {
 676         struct pf_srchash *sh;
 677         struct pf_src_node *n;
 678
 679         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
 680
 681         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 682         PF_HASHROW_LOCK(sh);
 683         LIST_FOREACH(n, &sh->nodes, entry)
 684                 if (n->rule.ptr == rule && n->af == af &&
 685                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 686                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 687                         break;
 688         if (n != NULL) {
 689                 n->states++;
 690                 PF_HASHROW_UNLOCK(sh);
 691         } else if (returnlocked == 0)
 692                 PF_HASHROW_UNLOCK(sh);
 693
 694         return (n);
 695 }
 696
 697 static int
 698 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 699     struct pf_addr *src, sa_family_t af)
 700 {
 701
 702         KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
 703             rule->rpool.opts & PF_POOL_STICKYADDR),
 704             ("%s for non-tracking rule %p", __func__, rule));
 705
 706         if (*sn == NULL)
 707                 *sn = pf_find_src_node(src, rule, af, 1);
 708
 709         if (*sn == NULL) {
 710                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 711
 712                 PF_HASHROW_ASSERT(sh);
 713
 714                 if (!rule->max_src_nodes ||
 715                     counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
 716                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 717                 else
 718                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
 719                             1);
 720                 if ((*sn) == NULL) {
 721                         PF_HASHROW_UNLOCK(sh);
 722                         return (-1);
 723                 }
 724
 725                 pf_init_threshold(&(*sn)->conn_rate,
 726                     rule->max_src_conn_rate.limit,
 727                     rule->max_src_conn_rate.seconds);
 728
 729                 (*sn)->af = af;
 730                 (*sn)->rule.ptr = rule;
 731                 PF_ACPY(&(*sn)->addr, src, af);
 732                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 733                 (*sn)->creation = time_uptime;
 734                 (*sn)->ruletype = rule->action;
 735                 (*sn)->states = 1;
 736                 if ((*sn)->rule.ptr != NULL)
 737                         counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
 738                 PF_HASHROW_UNLOCK(sh);
 739                 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
 740         } else {
 741                 if (rule->max_src_states &&
 742                     (*sn)->states >= rule->max_src_states) {
 743                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
 744                             1);
 745                         return (-1);
 746                 }
 747         }
 748         return (0);
 749 }
 750
 751 void
 752 pf_unlink_src_node(struct pf_src_node *src)
 753 {
 754
 755         PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]);
 756         LIST_REMOVE(src, entry);
 757         if (src->rule.ptr)
 758                 counter_u64_add(src->rule.ptr->src_nodes, -1);
 759 }
 760
 761 u_int
 762 pf_free_src_nodes(struct pf_src_node_list *head)
 763 {
 764         struct pf_src_node *sn, *tmp;
 765         u_int count = 0;
 766
 767         LIST_FOREACH_SAFE(sn, head, entry, tmp) {
 768                 uma_zfree(V_pf_sources_z, sn);
 769                 count++;
 770         }
 771
 772         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
 773
 774         return (count);
 775 }
 776
 777 void
 778 pf_mtag_initialize()
 779 {
 780
 781         pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 782             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
 783             UMA_ALIGN_PTR, 0);
 784 }
 785
 786 /* Per-vnet data storage structures initialization. */
 787 void
 788 pf_initialize()
 789 {
 790         struct pf_keyhash       *kh;
 791         struct pf_idhash        *ih;
 792         struct pf_srchash       *sh;
 793         u_int i;
 794
 795         if (pf_hashsize == 0 || !powerof2(pf_hashsize))
 796                 pf_hashsize = PF_HASHSIZ;
 797         if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
 798                 pf_srchashsize = PF_SRCHASHSIZ;
 799
 800         V_pf_hashseed = arc4random();
 801
 802         /* States and state keys storage. */
 803         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
 804             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 805         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
 806         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
 807         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
 808
 809         V_pf_state_key_z = uma_zcreate("pf state keys",
 810             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
 811             UMA_ALIGN_PTR, 0);
 812
 813         V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash),
 814             M_PFHASH, M_NOWAIT | M_ZERO);
 815         V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash),
 816             M_PFHASH, M_NOWAIT | M_ZERO);
 817         if (V_pf_keyhash == NULL || V_pf_idhash == NULL) {
 818                 printf("pf: Unable to allocate memory for "
 819                     "state_hashsize %lu.\n", pf_hashsize);
 820
 821                 free(V_pf_keyhash, M_PFHASH);
 822                 free(V_pf_idhash, M_PFHASH);
 823
 824                 pf_hashsize = PF_HASHSIZ;
 825                 V_pf_keyhash = mallocarray(pf_hashsize,
 826                     sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO);
 827                 V_pf_idhash = mallocarray(pf_hashsize,
 828                     sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO);
 829         }
 830
 831         pf_hashmask = pf_hashsize - 1;
 832         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 833             i++, kh++, ih++) {
 834                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
 835                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
 836         }
 837
 838         /* Source nodes. */
 839         V_pf_sources_z = uma_zcreate("pf source nodes",
 840             sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
 841             0);
 842         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
 843         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
 844         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
 845
 846         V_pf_srchash = mallocarray(pf_srchashsize,
 847             sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO);
 848         if (V_pf_srchash == NULL) {
 849                 printf("pf: Unable to allocate memory for "
 850                     "source_hashsize %lu.\n", pf_srchashsize);
 851
 852                 pf_srchashsize = PF_SRCHASHSIZ;
 853                 V_pf_srchash = mallocarray(pf_srchashsize,
 854                     sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO);
 855         }
 856
 857         pf_srchashmask = pf_srchashsize - 1;
 858         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
 859                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
 860
 861         /* ALTQ */
 862         TAILQ_INIT(&V_pf_altqs[0]);
 863         TAILQ_INIT(&V_pf_altqs[1]);
 864         TAILQ_INIT(&V_pf_altqs[2]);
 865         TAILQ_INIT(&V_pf_altqs[3]);
 866         TAILQ_INIT(&V_pf_pabuf);
 867         V_pf_altqs_active = &V_pf_altqs[0];
 868         V_pf_altq_ifs_active = &V_pf_altqs[1];
 869         V_pf_altqs_inactive = &V_pf_altqs[2];
 870         V_pf_altq_ifs_inactive = &V_pf_altqs[3];
 871
 872         /* Send & overload+flush queues. */
 873         STAILQ_INIT(&V_pf_sendqueue);
 874         SLIST_INIT(&V_pf_overloadqueue);
 875         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
 876
 877         /* Unlinked, but may be referenced rules. */
 878         TAILQ_INIT(&V_pf_unlinked_rules);
 879 }
 880
 881 void
 882 pf_mtag_cleanup()
 883 {
 884
 885         uma_zdestroy(pf_mtag_z);
 886 }
 887
 888 void
 889 pf_cleanup()
 890 {
 891         struct pf_keyhash       *kh;
 892         struct pf_idhash        *ih;
 893         struct pf_srchash       *sh;
 894         struct pf_send_entry    *pfse, *next;
 895         u_int i;
 896
 897         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 898             i++, kh++, ih++) {
 899                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
 900                     __func__));
 901                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
 902                     __func__));
 903                 mtx_destroy(&kh->lock);
 904                 mtx_destroy(&ih->lock);
 905         }
 906         free(V_pf_keyhash, M_PFHASH);
 907         free(V_pf_idhash, M_PFHASH);
 908
 909         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
 910                 KASSERT(LIST_EMPTY(&sh->nodes),
 911                     ("%s: source node hash not empty", __func__));
 912                 mtx_destroy(&sh->lock);
 913         }
 914         free(V_pf_srchash, M_PFHASH);
 915
 916         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
 917                 m_freem(pfse->pfse_m);
 918                 free(pfse, M_PFTEMP);
 919         }
 920
 921         uma_zdestroy(V_pf_sources_z);
 922         uma_zdestroy(V_pf_state_z);
 923         uma_zdestroy(V_pf_state_key_z);
 924 }
 925
 926 static int
 927 pf_mtag_uminit(void *mem, int size, int how)
 928 {
 929         struct m_tag *t;
 930
 931         t = (struct m_tag *)mem;
 932         t->m_tag_cookie = MTAG_ABI_COMPAT;
 933         t->m_tag_id = PACKET_TAG_PF;
 934         t->m_tag_len = sizeof(struct pf_mtag);
 935         t->m_tag_free = pf_mtag_free;
 936
 937         return (0);
 938 }
 939
 940 static void
 941 pf_mtag_free(struct m_tag *t)
 942 {
 943
 944         uma_zfree(pf_mtag_z, t);
 945 }
 946
 947 struct pf_mtag *
 948 pf_get_mtag(struct mbuf *m)
 949 {
 950         struct m_tag *mtag;
 951
 952         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 953                 return ((struct pf_mtag *)(mtag + 1));
 954
 955         mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
 956         if (mtag == NULL)
 957                 return (NULL);
 958         bzero(mtag + 1, sizeof(struct pf_mtag));
 959         m_tag_prepend(m, mtag);
 960
 961         return ((struct pf_mtag *)(mtag + 1));
 962 }
 963
 964 static int
 965 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
 966     struct pf_state *s)
 967 {
 968         struct pf_keyhash       *khs, *khw, *kh;
 969         struct pf_state_key     *sk, *cur;
 970         struct pf_state         *si, *olds = NULL;
 971         int idx;
 972
 973         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
 974         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
 975         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
 976
 977         /*
 978          * We need to lock hash slots of both keys. To avoid deadlock
 979          * we always lock the slot with lower address first. Unlock order
 980          * isn't important.
 981          *
 982          * We also need to lock ID hash slot before dropping key
 983          * locks. On success we return with ID hash slot locked.
 984          */
 985
 986         if (skw == sks) {
 987                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
 988                 PF_HASHROW_LOCK(khs);
 989         } else {
 990                 khs = &V_pf_keyhash[pf_hashkey(sks)];
 991                 khw = &V_pf_keyhash[pf_hashkey(skw)];
 992                 if (khs == khw) {
 993                         PF_HASHROW_LOCK(khs);
 994                 } else if (khs < khw) {
 995                         PF_HASHROW_LOCK(khs);
 996                         PF_HASHROW_LOCK(khw);
 997                 } else {
 998                         PF_HASHROW_LOCK(khw);
 999                         PF_HASHROW_LOCK(khs);
1000                 }
1001         }
1002
1003 #define KEYS_UNLOCK()   do {                    \
1004         if (khs != khw) {                       \
1005                 PF_HASHROW_UNLOCK(khs);         \
1006                 PF_HASHROW_UNLOCK(khw);         \
1007         } else                                  \
1008                 PF_HASHROW_UNLOCK(khs);         \
1009 } while (0)
1010
1011         /*
1012          * First run: start with wire key.
1013          */
1014         sk = skw;
1015         kh = khw;
1016         idx = PF_SK_WIRE;
1017
1018 keyattach:
1019         LIST_FOREACH(cur, &kh->keys, entry)
1020                 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
1021                         break;
1022
1023         if (cur != NULL) {
1024                 /* Key exists. Check for same kif, if none, add to key. */
1025                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
1026                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
1027
1028                         PF_HASHROW_LOCK(ih);
1029                         if (si->kif == s->kif &&
1030                             si->direction == s->direction) {
1031                                 if (sk->proto == IPPROTO_TCP &&
1032                                     si->src.state >= TCPS_FIN_WAIT_2 &&
1033                                     si->dst.state >= TCPS_FIN_WAIT_2) {
1034                                         /*
1035                                          * New state matches an old >FIN_WAIT_2
1036                                          * state. We can't drop key hash locks,
1037                                          * thus we can't unlink it properly.
1038                                          *
1039                                          * As a workaround we drop it into
1040                                          * TCPS_CLOSED state, schedule purge
1041                                          * ASAP and push it into the very end
1042                                          * of the slot TAILQ, so that it won't
1043                                          * conflict with our new state.
1044                                          */
1045                                         si->src.state = si->dst.state =
1046                                             TCPS_CLOSED;
1047                                         si->timeout = PFTM_PURGE;
1048                                         olds = si;
1049                                 } else {
1050                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
1051                                                 printf("pf: %s key attach "
1052                                                     "failed on %s: ",
1053                                                     (idx == PF_SK_WIRE) ?
1054                                                     "wire" : "stack",
1055                                                     s->kif->pfik_name);
1056                                                 pf_print_state_parts(s,
1057                                                     (idx == PF_SK_WIRE) ?
1058                                                     sk : NULL,
1059                                                     (idx == PF_SK_STACK) ?
1060                                                     sk : NULL);
1061                                                 printf(", existing: ");
1062                                                 pf_print_state_parts(si,
1063                                                     (idx == PF_SK_WIRE) ?
1064                                                     sk : NULL,
1065                                                     (idx == PF_SK_STACK) ?
1066                                                     sk : NULL);
1067                                                 printf("\n");
1068                                         }
1069                                         PF_HASHROW_UNLOCK(ih);
1070                                         KEYS_UNLOCK();
1071                                         uma_zfree(V_pf_state_key_z, sk);
1072                                         if (idx == PF_SK_STACK)
1073                                                 pf_detach_state(s);
1074                                         return (EEXIST); /* collision! */
1075                                 }
1076                         }
1077                         PF_HASHROW_UNLOCK(ih);
1078                 }
1079                 uma_zfree(V_pf_state_key_z, sk);
1080                 s->key[idx] = cur;
1081         } else {
1082                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1083                 s->key[idx] = sk;
1084         }
1085
1086 stateattach:
1087         /* List is sorted, if-bound states before floating. */
1088         if (s->kif == V_pfi_all)
1089                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1090         else
1091                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1092
1093         if (olds) {
1094                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1095                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1096                     key_list[idx]);
1097                 olds = NULL;
1098         }
1099
1100         /*
1101          * Attach done. See how should we (or should not?)
1102          * attach a second key.
1103          */
1104         if (sks == skw) {
1105                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1106                 idx = PF_SK_STACK;
1107                 sks = NULL;
1108                 goto stateattach;
1109         } else if (sks != NULL) {
1110                 /*
1111                  * Continue attaching with stack key.
1112                  */
1113                 sk = sks;
1114                 kh = khs;
1115                 idx = PF_SK_STACK;
1116                 sks = NULL;
1117                 goto keyattach;
1118         }
1119
1120         PF_STATE_LOCK(s);
1121         KEYS_UNLOCK();
1122
1123         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1124             ("%s failure", __func__));
1125
1126         return (0);
1127 #undef  KEYS_UNLOCK
1128 }
1129
1130 static void
1131 pf_detach_state(struct pf_state *s)
1132 {
1133         struct pf_state_key *sks = s->key[PF_SK_STACK];
1134         struct pf_keyhash *kh;
1135
1136         if (sks != NULL) {
1137                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1138                 PF_HASHROW_LOCK(kh);
1139                 if (s->key[PF_SK_STACK] != NULL)
1140                         pf_state_key_detach(s, PF_SK_STACK);
1141                 /*
1142                  * If both point to same key, then we are done.
1143                  */
1144                 if (sks == s->key[PF_SK_WIRE]) {
1145                         pf_state_key_detach(s, PF_SK_WIRE);
1146                         PF_HASHROW_UNLOCK(kh);
1147                         return;
1148                 }
1149                 PF_HASHROW_UNLOCK(kh);
1150         }
1151
1152         if (s->key[PF_SK_WIRE] != NULL) {
1153                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1154                 PF_HASHROW_LOCK(kh);
1155                 if (s->key[PF_SK_WIRE] != NULL)
1156                         pf_state_key_detach(s, PF_SK_WIRE);
1157                 PF_HASHROW_UNLOCK(kh);
1158         }
1159 }
1160
1161 static void
1162 pf_state_key_detach(struct pf_state *s, int idx)
1163 {
1164         struct pf_state_key *sk = s->key[idx];
1165 #ifdef INVARIANTS
1166         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1167
1168         PF_HASHROW_ASSERT(kh);
1169 #endif
1170         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1171         s->key[idx] = NULL;
1172
1173         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1174                 LIST_REMOVE(sk, entry);
1175                 uma_zfree(V_pf_state_key_z, sk);
1176         }
1177 }
1178
1179 static int
1180 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1181 {
1182         struct pf_state_key *sk = mem;
1183
1184         bzero(sk, sizeof(struct pf_state_key_cmp));
1185         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1186         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1187
1188         return (0);
1189 }
1190
1191 struct pf_state_key *
1192 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1193         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1194 {
1195         struct pf_state_key *sk;
1196
1197         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1198         if (sk == NULL)
1199                 return (NULL);
1200
1201         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1202         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1203         sk->port[pd->sidx] = sport;
1204         sk->port[pd->didx] = dport;
1205         sk->proto = pd->proto;
1206         sk->af = pd->af;
1207
1208         return (sk);
1209 }
1210
1211 struct pf_state_key *
1212 pf_state_key_clone(struct pf_state_key *orig)
1213 {
1214         struct pf_state_key *sk;
1215
1216         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1217         if (sk == NULL)
1218                 return (NULL);
1219
1220         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1221
1222         return (sk);
1223 }
1224
1225 int
1226 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1227     struct pf_state_key *sks, struct pf_state *s)
1228 {
1229         struct pf_idhash *ih;
1230         struct pf_state *cur;
1231         int error;
1232
1233         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1234             ("%s: sks not pristine", __func__));
1235         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1236             ("%s: skw not pristine", __func__));
1237         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1238
1239         s->kif = kif;
1240
1241         if (s->id == 0 && s->creatorid == 0) {
1242                 /* XXX: should be atomic, but probability of collision low */
1243                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1244                         V_pf_stateid[curcpu] = 1;
1245                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1246                 s->id = htobe64(s->id);
1247                 s->creatorid = V_pf_status.hostid;
1248         }
1249
1250         /* Returns with ID locked on success. */
1251         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1252                 return (error);
1253
1254         ih = &V_pf_idhash[PF_IDHASH(s)];
1255         PF_HASHROW_ASSERT(ih);
1256         LIST_FOREACH(cur, &ih->states, entry)
1257                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1258                         break;
1259
1260         if (cur != NULL) {
1261                 PF_HASHROW_UNLOCK(ih);
1262                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1263                         printf("pf: state ID collision: "
1264                             "id: %016llx creatorid: %08x\n",
1265                             (unsigned long long)be64toh(s->id),
1266                             ntohl(s->creatorid));
1267                 }
1268                 pf_detach_state(s);
1269                 return (EEXIST);
1270         }
1271         LIST_INSERT_HEAD(&ih->states, s, entry);
1272         /* One for keys, one for ID hash. */
1273         refcount_init(&s->refs, 2);
1274
1275         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1276         if (V_pfsync_insert_state_ptr != NULL)
1277                 V_pfsync_insert_state_ptr(s);
1278
1279         /* Returns locked. */
1280         return (0);
1281 }
1282
1283 /*
1284  * Find state by ID: returns with locked row on success.
1285  */
1286 struct pf_state *
1287 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1288 {
1289         struct pf_idhash *ih;
1290         struct pf_state *s;
1291
1292         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1293
1294         ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1295
1296         PF_HASHROW_LOCK(ih);
1297         LIST_FOREACH(s, &ih->states, entry)
1298                 if (s->id == id && s->creatorid == creatorid)
1299                         break;
1300
1301         if (s == NULL)
1302                 PF_HASHROW_UNLOCK(ih);
1303
1304         return (s);
1305 }
1306
1307 /*
1308  * Find state by key.
1309  * Returns with ID hash slot locked on success.
1310  */
1311 static struct pf_state *
1312 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1313 {
1314         struct pf_keyhash       *kh;
1315         struct pf_state_key     *sk;
1316         struct pf_state         *s;
1317         int idx;
1318
1319         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1320
1321         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1322
1323         PF_HASHROW_LOCK(kh);
1324         LIST_FOREACH(sk, &kh->keys, entry)
1325                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1326                         break;
1327         if (sk == NULL) {
1328                 PF_HASHROW_UNLOCK(kh);
1329                 return (NULL);
1330         }
1331
1332         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1333
1334         /* List is sorted, if-bound states before floating ones. */
1335         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1336                 if (s->kif == V_pfi_all || s->kif == kif) {
1337                         PF_STATE_LOCK(s);
1338                         PF_HASHROW_UNLOCK(kh);
1339                         if (s->timeout >= PFTM_MAX) {
1340                                 /*
1341                                  * State is either being processed by
1342                                  * pf_unlink_state() in an other thread, or
1343                                  * is scheduled for immediate expiry.
1344                                  */
1345                                 PF_STATE_UNLOCK(s);
1346                                 return (NULL);
1347                         }
1348                         return (s);
1349                 }
1350         PF_HASHROW_UNLOCK(kh);
1351
1352         return (NULL);
1353 }
1354
1355 struct pf_state *
1356 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1357 {
1358         struct pf_keyhash       *kh;
1359         struct pf_state_key     *sk;
1360         struct pf_state         *s, *ret = NULL;
1361         int                      idx, inout = 0;
1362
1363         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1364
1365         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1366
1367         PF_HASHROW_LOCK(kh);
1368         LIST_FOREACH(sk, &kh->keys, entry)
1369                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1370                         break;
1371         if (sk == NULL) {
1372                 PF_HASHROW_UNLOCK(kh);
1373                 return (NULL);
1374         }
1375         switch (dir) {
1376         case PF_IN:
1377                 idx = PF_SK_WIRE;
1378                 break;
1379         case PF_OUT:
1380                 idx = PF_SK_STACK;
1381                 break;
1382         case PF_INOUT:
1383                 idx = PF_SK_WIRE;
1384                 inout = 1;
1385                 break;
1386         default:
1387                 panic("%s: dir %u", __func__, dir);
1388         }
1389 second_run:
1390         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1391                 if (more == NULL) {
1392                         PF_HASHROW_UNLOCK(kh);
1393                         return (s);
1394                 }
1395
1396                 if (ret)
1397                         (*more)++;
1398                 else
1399                         ret = s;
1400         }
1401         if (inout == 1) {
1402                 inout = 0;
1403                 idx = PF_SK_STACK;
1404                 goto second_run;
1405         }
1406         PF_HASHROW_UNLOCK(kh);
1407
1408         return (ret);
1409 }
1410
1411 /* END state table stuff */
1412
1413 static void
1414 pf_send(struct pf_send_entry *pfse)
1415 {
1416
1417         PF_SENDQ_LOCK();
1418         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1419         PF_SENDQ_UNLOCK();
1420         swi_sched(V_pf_swi_cookie, 0);
1421 }
1422
1423 void
1424 pf_intr(void *v)
1425 {
1426         struct pf_send_head queue;
1427         struct pf_send_entry *pfse, *next;
1428
1429         CURVNET_SET((struct vnet *)v);
1430
1431         PF_SENDQ_LOCK();
1432         queue = V_pf_sendqueue;
1433         STAILQ_INIT(&V_pf_sendqueue);
1434         PF_SENDQ_UNLOCK();
1435
1436         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1437                 switch (pfse->pfse_type) {
1438 #ifdef INET
1439                 case PFSE_IP:
1440                         ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1441                         break;
1442                 case PFSE_ICMP:
1443                         icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1444                             pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1445                         break;
1446 #endif /* INET */
1447 #ifdef INET6
1448                 case PFSE_IP6:
1449                         ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1450                             NULL);
1451                         break;
1452                 case PFSE_ICMP6:
1453                         icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1454                             pfse->icmpopts.code, pfse->icmpopts.mtu);
1455                         break;
1456 #endif /* INET6 */
1457                 default:
1458                         panic("%s: unknown type", __func__);
1459                 }
1460                 free(pfse, M_PFTEMP);
1461         }
1462         CURVNET_RESTORE();
1463 }
1464
1465 void
1466 pf_purge_thread(void *unused __unused)
1467 {
1468         VNET_ITERATOR_DECL(vnet_iter);
1469
1470         sx_xlock(&pf_end_lock);
1471         while (pf_end_threads == 0) {
1472                 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", hz / 10);
1473
1474                 VNET_LIST_RLOCK();
1475                 VNET_FOREACH(vnet_iter) {
1476                         CURVNET_SET(vnet_iter);
1477
1478
1479                         /* Wait until V_pf_default_rule is initialized. */
1480                         if (V_pf_vnet_active == 0) {
1481                                 CURVNET_RESTORE();
1482                                 continue;
1483                         }
1484
1485                         /*
1486                          *  Process 1/interval fraction of the state
1487                          * table every run.
1488                          */
1489                         V_pf_purge_idx =
1490                             pf_purge_expired_states(V_pf_purge_idx, pf_hashmask /
1491                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1492
1493                         /*
1494                          * Purge other expired types every
1495                          * PFTM_INTERVAL seconds.
1496                          */
1497                         if (V_pf_purge_idx == 0) {
1498                                 /*
1499                                  * Order is important:
1500                                  * - states and src nodes reference rules
1501                                  * - states and rules reference kifs
1502                                  */
1503                                 pf_purge_expired_fragments();
1504                                 pf_purge_expired_src_nodes();
1505                                 pf_purge_unlinked_rules();
1506                                 pfi_kif_purge();
1507                         }
1508                         CURVNET_RESTORE();
1509                 }
1510                 VNET_LIST_RUNLOCK();
1511         }
1512
1513         pf_end_threads++;
1514         sx_xunlock(&pf_end_lock);
1515         kproc_exit(0);
1516 }
1517
1518 void
1519 pf_unload_vnet_purge(void)
1520 {
1521
1522         /*
1523          * To cleanse up all kifs and rules we need
1524          * two runs: first one clears reference flags,
1525          * then pf_purge_expired_states() doesn't
1526          * raise them, and then second run frees.
1527          */
1528         pf_purge_unlinked_rules();
1529         pfi_kif_purge();
1530
1531         /*
1532          * Now purge everything.
1533          */
1534         pf_purge_expired_states(0, pf_hashmask);
1535         pf_purge_fragments(UINT_MAX);
1536         pf_purge_expired_src_nodes();
1537
1538         /*
1539          * Now all kifs & rules should be unreferenced,
1540          * thus should be successfully freed.
1541          */
1542         pf_purge_unlinked_rules();
1543         pfi_kif_purge();
1544 }
1545
1546
1547 u_int32_t
1548 pf_state_expires(const struct pf_state *state)
1549 {
1550         u_int32_t       timeout;
1551         u_int32_t       start;
1552         u_int32_t       end;
1553         u_int32_t       states;
1554
1555         /* handle all PFTM_* > PFTM_MAX here */
1556         if (state->timeout == PFTM_PURGE)
1557                 return (time_uptime);
1558         KASSERT(state->timeout != PFTM_UNLINKED,
1559             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1560         KASSERT((state->timeout < PFTM_MAX),
1561             ("pf_state_expires: timeout > PFTM_MAX"));
1562         timeout = state->rule.ptr->timeout[state->timeout];
1563         if (!timeout)
1564                 timeout = V_pf_default_rule.timeout[state->timeout];
1565         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1566         if (start && state->rule.ptr != &V_pf_default_rule) {
1567                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1568                 states = counter_u64_fetch(state->rule.ptr->states_cur);
1569         } else {
1570                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1571                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1572                 states = V_pf_status.states;
1573         }
1574         if (end && states > start && start < end) {
1575                 if (states < end) {
1576                         timeout = (u_int64_t)timeout * (end - states) /
1577                             (end - start);
1578                         return (state->expire + timeout);
1579                 }
1580                 else
1581                         return (time_uptime);
1582         }
1583         return (state->expire + timeout);
1584 }
1585
1586 void
1587 pf_purge_expired_src_nodes()
1588 {
1589         struct pf_src_node_list  freelist;
1590         struct pf_srchash       *sh;
1591         struct pf_src_node      *cur, *next;
1592         int i;
1593
1594         LIST_INIT(&freelist);
1595         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1596             PF_HASHROW_LOCK(sh);
1597             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1598                 if (cur->states == 0 && cur->expire <= time_uptime) {
1599                         pf_unlink_src_node(cur);
1600                         LIST_INSERT_HEAD(&freelist, cur, entry);
1601                 } else if (cur->rule.ptr != NULL)
1602                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1603             PF_HASHROW_UNLOCK(sh);
1604         }
1605
1606         pf_free_src_nodes(&freelist);
1607
1608         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1609 }
1610
1611 static void
1612 pf_src_tree_remove_state(struct pf_state *s)
1613 {
1614         struct pf_src_node *sn;
1615         struct pf_srchash *sh;
1616         uint32_t timeout;
1617
1618         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
1619             s->rule.ptr->timeout[PFTM_SRC_NODE] :
1620             V_pf_default_rule.timeout[PFTM_SRC_NODE];
1621
1622         if (s->src_node != NULL) {
1623                 sn = s->src_node;
1624                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1625                 PF_HASHROW_LOCK(sh);
1626                 if (s->src.tcp_est)
1627                         --sn->conn;
1628                 if (--sn->states == 0)
1629                         sn->expire = time_uptime + timeout;
1630                 PF_HASHROW_UNLOCK(sh);
1631         }
1632         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1633                 sn = s->nat_src_node;
1634                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1635                 PF_HASHROW_LOCK(sh);
1636                 if (--sn->states == 0)
1637                         sn->expire = time_uptime + timeout;
1638                 PF_HASHROW_UNLOCK(sh);
1639         }
1640         s->src_node = s->nat_src_node = NULL;
1641 }
1642
1643 /*
1644  * Unlink and potentilly free a state. Function may be
1645  * called with ID hash row locked, but always returns
1646  * unlocked, since it needs to go through key hash locking.
1647  */
1648 int
1649 pf_unlink_state(struct pf_state *s, u_int flags)
1650 {
1651         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1652
1653         if ((flags & PF_ENTER_LOCKED) == 0)
1654                 PF_HASHROW_LOCK(ih);
1655         else
1656                 PF_HASHROW_ASSERT(ih);
1657
1658         if (s->timeout == PFTM_UNLINKED) {
1659                 /*
1660                  * State is being processed
1661                  * by pf_unlink_state() in
1662                  * an other thread.
1663                  */
1664                 PF_HASHROW_UNLOCK(ih);
1665                 return (0);     /* XXXGL: undefined actually */
1666         }
1667
1668         if (s->src.state == PF_TCPS_PROXY_DST) {
1669                 /* XXX wire key the right one? */
1670                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1671                     &s->key[PF_SK_WIRE]->addr[1],
1672                     &s->key[PF_SK_WIRE]->addr[0],
1673                     s->key[PF_SK_WIRE]->port[1],
1674                     s->key[PF_SK_WIRE]->port[0],
1675                     s->src.seqhi, s->src.seqlo + 1,
1676                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1677         }
1678
1679         LIST_REMOVE(s, entry);
1680         pf_src_tree_remove_state(s);
1681
1682         if (V_pfsync_delete_state_ptr != NULL)
1683                 V_pfsync_delete_state_ptr(s);
1684
1685         STATE_DEC_COUNTERS(s);
1686
1687         s->timeout = PFTM_UNLINKED;
1688
1689         PF_HASHROW_UNLOCK(ih);
1690
1691         pf_detach_state(s);
1692         /* pf_state_insert() initialises refs to 2, so we can never release the
1693          * last reference here, only in pf_release_state(). */
1694         (void)refcount_release(&s->refs);
1695
1696         return (pf_release_state(s));
1697 }
1698
1699 void
1700 pf_free_state(struct pf_state *cur)
1701 {
1702
1703         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1704         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1705             cur->timeout));
1706
1707         pf_normalize_tcp_cleanup(cur);
1708         uma_zfree(V_pf_state_z, cur);
1709         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1710 }
1711
1712 /*
1713  * Called only from pf_purge_thread(), thus serialized.
1714  */
1715 static u_int
1716 pf_purge_expired_states(u_int i, int maxcheck)
1717 {
1718         struct pf_idhash *ih;
1719         struct pf_state *s;
1720
1721         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1722
1723         /*
1724          * Go through hash and unlink states that expire now.
1725          */
1726         while (maxcheck > 0) {
1727
1728                 ih = &V_pf_idhash[i];
1729
1730                 /* only take the lock if we expect to do work */
1731                 if (!LIST_EMPTY(&ih->states)) {
1732 relock:
1733                         PF_HASHROW_LOCK(ih);
1734                         LIST_FOREACH(s, &ih->states, entry) {
1735                                 if (pf_state_expires(s) <= time_uptime) {
1736                                         V_pf_status.states -=
1737                                             pf_unlink_state(s, PF_ENTER_LOCKED);
1738                                         goto relock;
1739                                 }
1740                                 s->rule.ptr->rule_flag |= PFRULE_REFS;
1741                                 if (s->nat_rule.ptr != NULL)
1742                                         s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1743                                 if (s->anchor.ptr != NULL)
1744                                         s->anchor.ptr->rule_flag |= PFRULE_REFS;
1745                                 s->kif->pfik_flags |= PFI_IFLAG_REFS;
1746                                 if (s->rt_kif)
1747                                         s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1748                         }
1749                         PF_HASHROW_UNLOCK(ih);
1750                 }
1751
1752                 /* Return when we hit end of hash. */
1753                 if (++i > pf_hashmask) {
1754                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1755                         return (0);
1756                 }
1757
1758                 maxcheck--;
1759         }
1760
1761         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1762
1763         return (i);
1764 }
1765
1766 static void
1767 pf_purge_unlinked_rules()
1768 {
1769         struct pf_rulequeue tmpq;
1770         struct pf_rule *r, *r1;
1771
1772         /*
1773          * If we have overloading task pending, then we'd
1774          * better skip purging this time. There is a tiny
1775          * probability that overloading task references
1776          * an already unlinked rule.
1777          */
1778         PF_OVERLOADQ_LOCK();
1779         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1780                 PF_OVERLOADQ_UNLOCK();
1781                 return;
1782         }
1783         PF_OVERLOADQ_UNLOCK();
1784
1785         /*
1786          * Do naive mark-and-sweep garbage collecting of old rules.
1787          * Reference flag is raised by pf_purge_expired_states()
1788          * and pf_purge_expired_src_nodes().
1789          *
1790          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1791          * use a temporary queue.
1792          */
1793         TAILQ_INIT(&tmpq);
1794         PF_UNLNKDRULES_LOCK();
1795         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1796                 if (!(r->rule_flag & PFRULE_REFS)) {
1797                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1798                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1799                 } else
1800                         r->rule_flag &= ~PFRULE_REFS;
1801         }
1802         PF_UNLNKDRULES_UNLOCK();
1803
1804         if (!TAILQ_EMPTY(&tmpq)) {
1805                 PF_RULES_WLOCK();
1806                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1807                         TAILQ_REMOVE(&tmpq, r, entries);
1808                         pf_free_rule(r);
1809                 }
1810                 PF_RULES_WUNLOCK();
1811         }
1812 }
1813
1814 void
1815 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1816 {
1817         switch (af) {
1818 #ifdef INET
1819         case AF_INET: {
1820                 u_int32_t a = ntohl(addr->addr32[0]);
1821                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1822                     (a>>8)&255, a&255);
1823                 if (p) {
1824                         p = ntohs(p);
1825                         printf(":%u", p);
1826                 }
1827                 break;
1828         }
1829 #endif /* INET */
1830 #ifdef INET6
1831         case AF_INET6: {
1832                 u_int16_t b;
1833                 u_int8_t i, curstart, curend, maxstart, maxend;
1834                 curstart = curend = maxstart = maxend = 255;
1835                 for (i = 0; i < 8; i++) {
1836                         if (!addr->addr16[i]) {
1837                                 if (curstart == 255)
1838                                         curstart = i;
1839                                 curend = i;
1840                         } else {
1841                                 if ((curend - curstart) >
1842                                     (maxend - maxstart)) {
1843                                         maxstart = curstart;
1844                                         maxend = curend;
1845                                 }
1846                                 curstart = curend = 255;
1847                         }
1848                 }
1849                 if ((curend - curstart) >
1850                     (maxend - maxstart)) {
1851                         maxstart = curstart;
1852                         maxend = curend;
1853                 }
1854                 for (i = 0; i < 8; i++) {
1855                         if (i >= maxstart && i <= maxend) {
1856                                 if (i == 0)
1857                                         printf(":");
1858                                 if (i == maxend)
1859                                         printf(":");
1860                         } else {
1861                                 b = ntohs(addr->addr16[i]);
1862                                 printf("%x", b);
1863                                 if (i < 7)
1864                                         printf(":");
1865                         }
1866                 }
1867                 if (p) {
1868                         p = ntohs(p);
1869                         printf("[%u]", p);
1870                 }
1871                 break;
1872         }
1873 #endif /* INET6 */
1874         }
1875 }
1876
1877 void
1878 pf_print_state(struct pf_state *s)
1879 {
1880         pf_print_state_parts(s, NULL, NULL);
1881 }
1882
1883 static void
1884 pf_print_state_parts(struct pf_state *s,
1885     struct pf_state_key *skwp, struct pf_state_key *sksp)
1886 {
1887         struct pf_state_key *skw, *sks;
1888         u_int8_t proto, dir;
1889
1890         /* Do our best to fill these, but they're skipped if NULL */
1891         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1892         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1893         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1894         dir = s ? s->direction : 0;
1895
1896         switch (proto) {
1897         case IPPROTO_IPV4:
1898                 printf("IPv4");
1899                 break;
1900         case IPPROTO_IPV6:
1901                 printf("IPv6");
1902                 break;
1903         case IPPROTO_TCP:
1904                 printf("TCP");
1905                 break;
1906         case IPPROTO_UDP:
1907                 printf("UDP");
1908                 break;
1909         case IPPROTO_ICMP:
1910                 printf("ICMP");
1911                 break;
1912         case IPPROTO_ICMPV6:
1913                 printf("ICMPv6");
1914                 break;
1915         default:
1916                 printf("%u", proto);
1917                 break;
1918         }
1919         switch (dir) {
1920         case PF_IN:
1921                 printf(" in");
1922                 break;
1923         case PF_OUT:
1924                 printf(" out");
1925                 break;
1926         }
1927         if (skw) {
1928                 printf(" wire: ");
1929                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1930                 printf(" ");
1931                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1932         }
1933         if (sks) {
1934                 printf(" stack: ");
1935                 if (sks != skw) {
1936                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1937                         printf(" ");
1938                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1939                 } else
1940                         printf("-");
1941         }
1942         if (s) {
1943                 if (proto == IPPROTO_TCP) {
1944                         printf(" [lo=%u high=%u win=%u modulator=%u",
1945                             s->src.seqlo, s->src.seqhi,
1946                             s->src.max_win, s->src.seqdiff);
1947                         if (s->src.wscale && s->dst.wscale)
1948                                 printf(" wscale=%u",
1949                                     s->src.wscale & PF_WSCALE_MASK);
1950                         printf("]");
1951                         printf(" [lo=%u high=%u win=%u modulator=%u",
1952                             s->dst.seqlo, s->dst.seqhi,
1953                             s->dst.max_win, s->dst.seqdiff);
1954                         if (s->src.wscale && s->dst.wscale)
1955                                 printf(" wscale=%u",
1956                                 s->dst.wscale & PF_WSCALE_MASK);
1957                         printf("]");
1958                 }
1959                 printf(" %u:%u", s->src.state, s->dst.state);
1960         }
1961 }
1962
1963 void
1964 pf_print_flags(u_int8_t f)
1965 {
1966         if (f)
1967                 printf(" ");
1968         if (f & TH_FIN)
1969                 printf("F");
1970         if (f & TH_SYN)
1971                 printf("S");
1972         if (f & TH_RST)
1973                 printf("R");
1974         if (f & TH_PUSH)
1975                 printf("P");
1976         if (f & TH_ACK)
1977                 printf("A");
1978         if (f & TH_URG)
1979                 printf("U");
1980         if (f & TH_ECE)
1981                 printf("E");
1982         if (f & TH_CWR)
1983                 printf("W");
1984 }
1985
1986 #define PF_SET_SKIP_STEPS(i)                                    \
1987         do {                                                    \
1988                 while (head[i] != cur) {                        \
1989                         head[i]->skip[i].ptr = cur;             \
1990                         head[i] = TAILQ_NEXT(head[i], entries); \
1991                 }                                               \
1992         } while (0)
1993
1994 void
1995 pf_calc_skip_steps(struct pf_rulequeue *rules)
1996 {
1997         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1998         int i;
1999
2000         cur = TAILQ_FIRST(rules);
2001         prev = cur;
2002         for (i = 0; i < PF_SKIP_COUNT; ++i)
2003                 head[i] = cur;
2004         while (cur != NULL) {
2005
2006                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
2007                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
2008                 if (cur->direction != prev->direction)
2009                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
2010                 if (cur->af != prev->af)
2011                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
2012                 if (cur->proto != prev->proto)
2013                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
2014                 if (cur->src.neg != prev->src.neg ||
2015                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
2016                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
2017                 if (cur->src.port[0] != prev->src.port[0] ||
2018                     cur->src.port[1] != prev->src.port[1] ||
2019                     cur->src.port_op != prev->src.port_op)
2020                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
2021                 if (cur->dst.neg != prev->dst.neg ||
2022                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
2023                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
2024                 if (cur->dst.port[0] != prev->dst.port[0] ||
2025                     cur->dst.port[1] != prev->dst.port[1] ||
2026                     cur->dst.port_op != prev->dst.port_op)
2027                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
2028
2029                 prev = cur;
2030                 cur = TAILQ_NEXT(cur, entries);
2031         }
2032         for (i = 0; i < PF_SKIP_COUNT; ++i)
2033                 PF_SET_SKIP_STEPS(i);
2034 }
2035
2036 static int
2037 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
2038 {
2039         if (aw1->type != aw2->type)
2040                 return (1);
2041         switch (aw1->type) {
2042         case PF_ADDR_ADDRMASK:
2043         case PF_ADDR_RANGE:
2044                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2045                         return (1);
2046                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2047                         return (1);
2048                 return (0);
2049         case PF_ADDR_DYNIFTL:
2050                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2051         case PF_ADDR_NOROUTE:
2052         case PF_ADDR_URPFFAILED:
2053                 return (0);
2054         case PF_ADDR_TABLE:
2055                 return (aw1->p.tbl != aw2->p.tbl);
2056         default:
2057                 printf("invalid address type: %d\n", aw1->type);
2058                 return (1);
2059         }
2060 }
2061
2062 /**
2063  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2064  * header isn't always a full checksum. In some cases (i.e. output) it's a
2065  * pseudo-header checksum, which is a partial checksum over src/dst IP
2066  * addresses, protocol number and length.
2067  *
2068  * That means we have the following cases:
2069  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2070  *      checksums, we need to update the checksum whenever we change anything.
2071  *  * Output (i.e. the checksum is a pseudo-header checksum):
2072  *      x The field being updated is src/dst address or affects the length of
2073  *      the packet. We need to update the pseudo-header checksum (note that this
2074  *      checksum is not ones' complement).
2075  *      x Some other field is being modified (e.g. src/dst port numbers): We
2076  *      don't have to update anything.
2077  **/
2078 u_int16_t
2079 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2080 {
2081         u_int32_t       l;
2082
2083         if (udp && !cksum)
2084                 return (0x0000);
2085         l = cksum + old - new;
2086         l = (l >> 16) + (l & 65535);
2087         l = l & 65535;
2088         if (udp && !l)
2089                 return (0xFFFF);
2090         return (l);
2091 }
2092
2093 u_int16_t
2094 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2095         u_int16_t new, u_int8_t udp)
2096 {
2097         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2098                 return (cksum);
2099
2100         return (pf_cksum_fixup(cksum, old, new, udp));
2101 }
2102
2103 static void
2104 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2105         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2106         sa_family_t af)
2107 {
2108         struct pf_addr  ao;
2109         u_int16_t       po = *p;
2110
2111         PF_ACPY(&ao, a, af);
2112         PF_ACPY(a, an, af);
2113
2114         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2115                 *pc = ~*pc;
2116
2117         *p = pn;
2118
2119         switch (af) {
2120 #ifdef INET
2121         case AF_INET:
2122                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2123                     ao.addr16[0], an->addr16[0], 0),
2124                     ao.addr16[1], an->addr16[1], 0);
2125                 *p = pn;
2126
2127                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2128                     ao.addr16[0], an->addr16[0], u),
2129                     ao.addr16[1], an->addr16[1], u);
2130
2131                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2132                 break;
2133 #endif /* INET */
2134 #ifdef INET6
2135         case AF_INET6:
2136                 *pc = 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(*pc,
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                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2149                 break;
2150 #endif /* INET6 */
2151         }
2152
2153         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2154             CSUM_DELAY_DATA_IPV6)) {
2155                 *pc = ~*pc;
2156                 if (! *pc)
2157                         *pc = 0xffff;
2158         }
2159 }
2160
2161 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2162 void
2163 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2164 {
2165         u_int32_t       ao;
2166
2167         memcpy(&ao, a, sizeof(ao));
2168         memcpy(a, &an, sizeof(u_int32_t));
2169         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2170             ao % 65536, an % 65536, u);
2171 }
2172
2173 void
2174 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2175 {
2176         u_int32_t       ao;
2177
2178         memcpy(&ao, a, sizeof(ao));
2179         memcpy(a, &an, sizeof(u_int32_t));
2180
2181         *c = pf_proto_cksum_fixup(m,
2182             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2183             ao % 65536, an % 65536, udp);
2184 }
2185
2186 #ifdef INET6
2187 static void
2188 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2189 {
2190         struct pf_addr  ao;
2191
2192         PF_ACPY(&ao, a, AF_INET6);
2193         PF_ACPY(a, an, AF_INET6);
2194
2195         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2196             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2197             pf_cksum_fixup(pf_cksum_fixup(*c,
2198             ao.addr16[0], an->addr16[0], u),
2199             ao.addr16[1], an->addr16[1], u),
2200             ao.addr16[2], an->addr16[2], u),
2201             ao.addr16[3], an->addr16[3], u),
2202             ao.addr16[4], an->addr16[4], u),
2203             ao.addr16[5], an->addr16[5], u),
2204             ao.addr16[6], an->addr16[6], u),
2205             ao.addr16[7], an->addr16[7], u);
2206 }
2207 #endif /* INET6 */
2208
2209 static void
2210 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2211     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2212     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2213 {
2214         struct pf_addr  oia, ooa;
2215
2216         PF_ACPY(&oia, ia, af);
2217         if (oa)
2218                 PF_ACPY(&ooa, oa, af);
2219
2220         /* Change inner protocol port, fix inner protocol checksum. */
2221         if (ip != NULL) {
2222                 u_int16_t       oip = *ip;
2223                 u_int32_t       opc;
2224
2225                 if (pc != NULL)
2226                         opc = *pc;
2227                 *ip = np;
2228                 if (pc != NULL)
2229                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2230                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2231                 if (pc != NULL)
2232                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2233         }
2234         /* Change inner ip address, fix inner ip and icmp checksums. */
2235         PF_ACPY(ia, na, af);
2236         switch (af) {
2237 #ifdef INET
2238         case AF_INET: {
2239                 u_int32_t        oh2c = *h2c;
2240
2241                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2242                     oia.addr16[0], ia->addr16[0], 0),
2243                     oia.addr16[1], ia->addr16[1], 0);
2244                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2245                     oia.addr16[0], ia->addr16[0], 0),
2246                     oia.addr16[1], ia->addr16[1], 0);
2247                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2248                 break;
2249         }
2250 #endif /* INET */
2251 #ifdef INET6
2252         case AF_INET6:
2253                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2254                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2255                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2256                     oia.addr16[0], ia->addr16[0], u),
2257                     oia.addr16[1], ia->addr16[1], u),
2258                     oia.addr16[2], ia->addr16[2], u),
2259                     oia.addr16[3], ia->addr16[3], u),
2260                     oia.addr16[4], ia->addr16[4], u),
2261                     oia.addr16[5], ia->addr16[5], u),
2262                     oia.addr16[6], ia->addr16[6], u),
2263                     oia.addr16[7], ia->addr16[7], u);
2264                 break;
2265 #endif /* INET6 */
2266         }
2267         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2268         if (oa) {
2269                 PF_ACPY(oa, na, af);
2270                 switch (af) {
2271 #ifdef INET
2272                 case AF_INET:
2273                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2274                             ooa.addr16[0], oa->addr16[0], 0),
2275                             ooa.addr16[1], oa->addr16[1], 0);
2276                         break;
2277 #endif /* INET */
2278 #ifdef INET6
2279                 case AF_INET6:
2280                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2281                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2282                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2283                             ooa.addr16[0], oa->addr16[0], u),
2284                             ooa.addr16[1], oa->addr16[1], u),
2285                             ooa.addr16[2], oa->addr16[2], u),
2286                             ooa.addr16[3], oa->addr16[3], u),
2287                             ooa.addr16[4], oa->addr16[4], u),
2288                             ooa.addr16[5], oa->addr16[5], u),
2289                             ooa.addr16[6], oa->addr16[6], u),
2290                             ooa.addr16[7], oa->addr16[7], u);
2291                         break;
2292 #endif /* INET6 */
2293                 }
2294         }
2295 }
2296
2297
2298 /*
2299  * Need to modulate the sequence numbers in the TCP SACK option
2300  * (credits to Krzysztof Pfaff for report and patch)
2301  */
2302 static int
2303 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2304     struct tcphdr *th, struct pf_state_peer *dst)
2305 {
2306         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2307         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2308         int copyback = 0, i, olen;
2309         struct sackblk sack;
2310
2311 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2312         if (hlen < TCPOLEN_SACKLEN ||
2313             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2314                 return 0;
2315
2316         while (hlen >= TCPOLEN_SACKLEN) {
2317                 olen = opt[1];
2318                 switch (*opt) {
2319                 case TCPOPT_EOL:        /* FALLTHROUGH */
2320                 case TCPOPT_NOP:
2321                         opt++;
2322                         hlen--;
2323                         break;
2324                 case TCPOPT_SACK:
2325                         if (olen > hlen)
2326                                 olen = hlen;
2327                         if (olen >= TCPOLEN_SACKLEN) {
2328                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2329                                     i += TCPOLEN_SACK) {
2330                                         memcpy(&sack, &opt[i], sizeof(sack));
2331                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2332                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2333                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2334                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2335                                         memcpy(&opt[i], &sack, sizeof(sack));
2336                                 }
2337                                 copyback = 1;
2338                         }
2339                         /* FALLTHROUGH */
2340                 default:
2341                         if (olen < 2)
2342                                 olen = 2;
2343                         hlen -= olen;
2344                         opt += olen;
2345                 }
2346         }
2347
2348         if (copyback)
2349                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2350         return (copyback);
2351 }
2352
2353 static void
2354 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2355     const struct pf_addr *saddr, const struct pf_addr *daddr,
2356     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2357     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2358     u_int16_t rtag, struct ifnet *ifp)
2359 {
2360         struct pf_send_entry *pfse;
2361         struct mbuf     *m;
2362         int              len, tlen;
2363 #ifdef INET
2364         struct ip       *h = NULL;
2365 #endif /* INET */
2366 #ifdef INET6
2367         struct ip6_hdr  *h6 = NULL;
2368 #endif /* INET6 */
2369         struct tcphdr   *th;
2370         char            *opt;
2371         struct pf_mtag  *pf_mtag;
2372
2373         len = 0;
2374         th = NULL;
2375
2376         /* maximum segment size tcp option */
2377         tlen = sizeof(struct tcphdr);
2378         if (mss)
2379                 tlen += 4;
2380
2381         switch (af) {
2382 #ifdef INET
2383         case AF_INET:
2384                 len = sizeof(struct ip) + tlen;
2385                 break;
2386 #endif /* INET */
2387 #ifdef INET6
2388         case AF_INET6:
2389                 len = sizeof(struct ip6_hdr) + tlen;
2390                 break;
2391 #endif /* INET6 */
2392         default:
2393                 panic("%s: unsupported af %d", __func__, af);
2394         }
2395
2396         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2397         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2398         if (pfse == NULL)
2399                 return;
2400         m = m_gethdr(M_NOWAIT, MT_DATA);
2401         if (m == NULL) {
2402                 free(pfse, M_PFTEMP);
2403                 return;
2404         }
2405 #ifdef MAC
2406         mac_netinet_firewall_send(m);
2407 #endif
2408         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2409                 free(pfse, M_PFTEMP);
2410                 m_freem(m);
2411                 return;
2412         }
2413         if (tag)
2414                 m->m_flags |= M_SKIP_FIREWALL;
2415         pf_mtag->tag = rtag;
2416
2417         if (r != NULL && r->rtableid >= 0)
2418                 M_SETFIB(m, r->rtableid);
2419
2420 #ifdef ALTQ
2421         if (r != NULL && r->qid) {
2422                 pf_mtag->qid = r->qid;
2423
2424                 /* add hints for ecn */
2425                 pf_mtag->hdr = mtod(m, struct ip *);
2426         }
2427 #endif /* ALTQ */
2428         m->m_data += max_linkhdr;
2429         m->m_pkthdr.len = m->m_len = len;
2430         m->m_pkthdr.rcvif = NULL;
2431         bzero(m->m_data, len);
2432         switch (af) {
2433 #ifdef INET
2434         case AF_INET:
2435                 h = mtod(m, struct ip *);
2436
2437                 /* IP header fields included in the TCP checksum */
2438                 h->ip_p = IPPROTO_TCP;
2439                 h->ip_len = htons(tlen);
2440                 h->ip_src.s_addr = saddr->v4.s_addr;
2441                 h->ip_dst.s_addr = daddr->v4.s_addr;
2442
2443                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2444                 break;
2445 #endif /* INET */
2446 #ifdef INET6
2447         case AF_INET6:
2448                 h6 = mtod(m, struct ip6_hdr *);
2449
2450                 /* IP header fields included in the TCP checksum */
2451                 h6->ip6_nxt = IPPROTO_TCP;
2452                 h6->ip6_plen = htons(tlen);
2453                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2454                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2455
2456                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2457                 break;
2458 #endif /* INET6 */
2459         }
2460
2461         /* TCP header */
2462         th->th_sport = sport;
2463         th->th_dport = dport;
2464         th->th_seq = htonl(seq);
2465         th->th_ack = htonl(ack);
2466         th->th_off = tlen >> 2;
2467         th->th_flags = flags;
2468         th->th_win = htons(win);
2469
2470         if (mss) {
2471                 opt = (char *)(th + 1);
2472                 opt[0] = TCPOPT_MAXSEG;
2473                 opt[1] = 4;
2474                 HTONS(mss);
2475                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2476         }
2477
2478         switch (af) {
2479 #ifdef INET
2480         case AF_INET:
2481                 /* TCP checksum */
2482                 th->th_sum = in_cksum(m, len);
2483
2484                 /* Finish the IP header */
2485                 h->ip_v = 4;
2486                 h->ip_hl = sizeof(*h) >> 2;
2487                 h->ip_tos = IPTOS_LOWDELAY;
2488                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2489                 h->ip_len = htons(len);
2490                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2491                 h->ip_sum = 0;
2492
2493                 pfse->pfse_type = PFSE_IP;
2494                 break;
2495 #endif /* INET */
2496 #ifdef INET6
2497         case AF_INET6:
2498                 /* TCP checksum */
2499                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2500                     sizeof(struct ip6_hdr), tlen);
2501
2502                 h6->ip6_vfc |= IPV6_VERSION;
2503                 h6->ip6_hlim = IPV6_DEFHLIM;
2504
2505                 pfse->pfse_type = PFSE_IP6;
2506                 break;
2507 #endif /* INET6 */
2508         }
2509         pfse->pfse_m = m;
2510         pf_send(pfse);
2511 }
2512
2513 static void
2514 pf_return(struct pf_rule *r, struct pf_rule *nr, struct pf_pdesc *pd,
2515     struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th,
2516     struct pfi_kif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen,
2517     u_short *reason)
2518 {
2519         struct pf_addr  * const saddr = pd->src;
2520         struct pf_addr  * const daddr = pd->dst;
2521         sa_family_t      af = pd->af;
2522
2523         /* undo NAT changes, if they have taken place */
2524         if (nr != NULL) {
2525                 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
2526                 PF_ACPY(daddr, &sk->addr[pd->didx], af);
2527                 if (pd->sport)
2528                         *pd->sport = sk->port[pd->sidx];
2529                 if (pd->dport)
2530                         *pd->dport = sk->port[pd->didx];
2531                 if (pd->proto_sum)
2532                         *pd->proto_sum = bproto_sum;
2533                 if (pd->ip_sum)
2534                         *pd->ip_sum = bip_sum;
2535                 m_copyback(m, off, hdrlen, pd->hdr.any);
2536         }
2537         if (pd->proto == IPPROTO_TCP &&
2538             ((r->rule_flag & PFRULE_RETURNRST) ||
2539             (r->rule_flag & PFRULE_RETURN)) &&
2540             !(th->th_flags & TH_RST)) {
2541                 u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
2542                 int              len = 0;
2543 #ifdef INET
2544                 struct ip       *h4;
2545 #endif
2546 #ifdef INET6
2547                 struct ip6_hdr  *h6;
2548 #endif
2549
2550                 switch (af) {
2551 #ifdef INET
2552                 case AF_INET:
2553                         h4 = mtod(m, struct ip *);
2554                         len = ntohs(h4->ip_len) - off;
2555                         break;
2556 #endif
2557 #ifdef INET6
2558                 case AF_INET6:
2559                         h6 = mtod(m, struct ip6_hdr *);
2560                         len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
2561                         break;
2562 #endif
2563                 }
2564
2565                 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
2566                         REASON_SET(reason, PFRES_PROTCKSUM);
2567                 else {
2568                         if (th->th_flags & TH_SYN)
2569                                 ack++;
2570                         if (th->th_flags & TH_FIN)
2571                                 ack++;
2572                         pf_send_tcp(m, r, af, pd->dst,
2573                                 pd->src, th->th_dport, th->th_sport,
2574                                 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2575                                 r->return_ttl, 1, 0, kif->pfik_ifp);
2576                 }
2577         } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
2578                 r->return_icmp)
2579                 pf_send_icmp(m, r->return_icmp >> 8,
2580                         r->return_icmp & 255, af, r);
2581         else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
2582                 r->return_icmp6)
2583                 pf_send_icmp(m, r->return_icmp6 >> 8,
2584                         r->return_icmp6 & 255, af, r);
2585 }
2586
2587
2588 static int
2589 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio)
2590 {
2591         struct m_tag *mtag;
2592
2593         KASSERT(prio <= PF_PRIO_MAX,
2594             ("%s with invalid pcp", __func__));
2595
2596         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
2597         if (mtag == NULL) {
2598                 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
2599                     sizeof(uint8_t), M_NOWAIT);
2600                 if (mtag == NULL)
2601                         return (ENOMEM);
2602                 m_tag_prepend(m, mtag);
2603         }
2604
2605         *(uint8_t *)(mtag + 1) = prio;
2606         return (0);
2607 }
2608
2609 static int
2610 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
2611 {
2612         struct m_tag *mtag;
2613         u_int8_t mpcp;
2614
2615         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
2616         if (mtag == NULL)
2617                 return (0);
2618
2619         if (prio == PF_PRIO_ZERO)
2620                 prio = 0;
2621
2622         mpcp = *(uint8_t *)(mtag + 1);
2623
2624         return (mpcp == prio);
2625 }
2626
2627 static void
2628 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2629     struct pf_rule *r)
2630 {
2631         struct pf_send_entry *pfse;
2632         struct mbuf *m0;
2633         struct pf_mtag *pf_mtag;
2634
2635         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2636         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2637         if (pfse == NULL)
2638                 return;
2639
2640         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2641                 free(pfse, M_PFTEMP);
2642                 return;
2643         }
2644
2645         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2646                 free(pfse, M_PFTEMP);
2647                 return;
2648         }
2649         /* XXX: revisit */
2650         m0->m_flags |= M_SKIP_FIREWALL;
2651
2652         if (r->rtableid >= 0)
2653                 M_SETFIB(m0, r->rtableid);
2654
2655 #ifdef ALTQ
2656         if (r->qid) {
2657                 pf_mtag->qid = r->qid;
2658                 /* add hints for ecn */
2659                 pf_mtag->hdr = mtod(m0, struct ip *);
2660         }
2661 #endif /* ALTQ */
2662
2663         switch (af) {
2664 #ifdef INET
2665         case AF_INET:
2666                 pfse->pfse_type = PFSE_ICMP;
2667                 break;
2668 #endif /* INET */
2669 #ifdef INET6
2670         case AF_INET6:
2671                 pfse->pfse_type = PFSE_ICMP6;
2672                 break;
2673 #endif /* INET6 */
2674         }
2675         pfse->pfse_m = m0;
2676         pfse->icmpopts.type = type;
2677         pfse->icmpopts.code = code;
2678         pf_send(pfse);
2679 }
2680
2681 /*
2682  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2683  * If n is 0, they match if they are equal. If n is != 0, they match if they
2684  * are different.
2685  */
2686 int
2687 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2688     struct pf_addr *b, sa_family_t af)
2689 {
2690         int     match = 0;
2691
2692         switch (af) {
2693 #ifdef INET
2694         case AF_INET:
2695                 if ((a->addr32[0] & m->addr32[0]) ==
2696                     (b->addr32[0] & m->addr32[0]))
2697                         match++;
2698                 break;
2699 #endif /* INET */
2700 #ifdef INET6
2701         case AF_INET6:
2702                 if (((a->addr32[0] & m->addr32[0]) ==
2703                      (b->addr32[0] & m->addr32[0])) &&
2704                     ((a->addr32[1] & m->addr32[1]) ==
2705                      (b->addr32[1] & m->addr32[1])) &&
2706                     ((a->addr32[2] & m->addr32[2]) ==
2707                      (b->addr32[2] & m->addr32[2])) &&
2708                     ((a->addr32[3] & m->addr32[3]) ==
2709                      (b->addr32[3] & m->addr32[3])))
2710                         match++;
2711                 break;
2712 #endif /* INET6 */
2713         }
2714         if (match) {
2715                 if (n)
2716                         return (0);
2717                 else
2718                         return (1);
2719         } else {
2720                 if (n)
2721                         return (1);
2722                 else
2723                         return (0);
2724         }
2725 }
2726
2727 /*
2728  * Return 1 if b <= a <= e, otherwise return 0.
2729  */
2730 int
2731 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2732     struct pf_addr *a, sa_family_t af)
2733 {
2734         switch (af) {
2735 #ifdef INET
2736         case AF_INET:
2737                 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
2738                     (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
2739                         return (0);
2740                 break;
2741 #endif /* INET */
2742 #ifdef INET6
2743         case AF_INET6: {
2744                 int     i;
2745
2746                 /* check a >= b */
2747                 for (i = 0; i < 4; ++i)
2748                         if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
2749                                 break;
2750                         else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
2751                                 return (0);
2752                 /* check a <= e */
2753                 for (i = 0; i < 4; ++i)
2754                         if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
2755                                 break;
2756                         else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
2757                                 return (0);
2758                 break;
2759         }
2760 #endif /* INET6 */
2761         }
2762         return (1);
2763 }
2764
2765 static int
2766 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2767 {
2768         switch (op) {
2769         case PF_OP_IRG:
2770                 return ((p > a1) && (p < a2));
2771         case PF_OP_XRG:
2772                 return ((p < a1) || (p > a2));
2773         case PF_OP_RRG:
2774                 return ((p >= a1) && (p <= a2));
2775         case PF_OP_EQ:
2776                 return (p == a1);
2777         case PF_OP_NE:
2778                 return (p != a1);
2779         case PF_OP_LT:
2780                 return (p < a1);
2781         case PF_OP_LE:
2782                 return (p <= a1);
2783         case PF_OP_GT:
2784                 return (p > a1);
2785         case PF_OP_GE:
2786                 return (p >= a1);
2787         }
2788         return (0); /* never reached */
2789 }
2790
2791 int
2792 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2793 {
2794         NTOHS(a1);
2795         NTOHS(a2);
2796         NTOHS(p);
2797         return (pf_match(op, a1, a2, p));
2798 }
2799
2800 static int
2801 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2802 {
2803         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2804                 return (0);
2805         return (pf_match(op, a1, a2, u));
2806 }
2807
2808 static int
2809 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2810 {
2811         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2812                 return (0);
2813         return (pf_match(op, a1, a2, g));
2814 }
2815
2816 int
2817 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2818 {
2819         if (*tag == -1)
2820                 *tag = mtag;
2821
2822         return ((!r->match_tag_not && r->match_tag == *tag) ||
2823             (r->match_tag_not && r->match_tag != *tag));
2824 }
2825
2826 int
2827 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2828 {
2829
2830         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2831
2832         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2833                 return (ENOMEM);
2834
2835         pd->pf_mtag->tag = tag;
2836
2837         return (0);
2838 }
2839
2840 #define PF_ANCHOR_STACKSIZE     32
2841 struct pf_anchor_stackframe {
2842         struct pf_ruleset       *rs;
2843         struct pf_rule          *r;     /* XXX: + match bit */
2844         struct pf_anchor        *child;
2845 };
2846
2847 /*
2848  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2849  */
2850 #define PF_ANCHORSTACK_MATCH    0x00000001
2851 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2852
2853 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2854 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2855                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2856 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2857                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2858 } while (0)
2859
2860 void
2861 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2862     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2863     int *match)
2864 {
2865         struct pf_anchor_stackframe     *f;
2866
2867         PF_RULES_RASSERT();
2868
2869         if (match)
2870                 *match = 0;
2871         if (*depth >= PF_ANCHOR_STACKSIZE) {
2872                 printf("%s: anchor stack overflow on %s\n",
2873                     __func__, (*r)->anchor->name);
2874                 *r = TAILQ_NEXT(*r, entries);
2875                 return;
2876         } else if (*depth == 0 && a != NULL)
2877                 *a = *r;
2878         f = stack + (*depth)++;
2879         f->rs = *rs;
2880         f->r = *r;
2881         if ((*r)->anchor_wildcard) {
2882                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2883
2884                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2885                         *r = NULL;
2886                         return;
2887                 }
2888                 *rs = &f->child->ruleset;
2889         } else {
2890                 f->child = NULL;
2891                 *rs = &(*r)->anchor->ruleset;
2892         }
2893         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2894 }
2895
2896 int
2897 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2898     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2899     int *match)
2900 {
2901         struct pf_anchor_stackframe     *f;
2902         struct pf_rule *fr;
2903         int quick = 0;
2904
2905         PF_RULES_RASSERT();
2906
2907         do {
2908                 if (*depth <= 0)
2909                         break;
2910                 f = stack + *depth - 1;
2911                 fr = PF_ANCHOR_RULE(f);
2912                 if (f->child != NULL) {
2913                         struct pf_anchor_node *parent;
2914
2915                         /*
2916                          * This block traverses through
2917                          * a wildcard anchor.
2918                          */
2919                         parent = &fr->anchor->children;
2920                         if (match != NULL && *match) {
2921                                 /*
2922                                  * If any of "*" matched, then
2923                                  * "foo/ *" matched, mark frame
2924                                  * appropriately.
2925                                  */
2926                                 PF_ANCHOR_SET_MATCH(f);
2927                                 *match = 0;
2928                         }
2929                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2930                         if (f->child != NULL) {
2931                                 *rs = &f->child->ruleset;
2932                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2933                                 if (*r == NULL)
2934                                         continue;
2935                                 else
2936                                         break;
2937                         }
2938                 }
2939                 (*depth)--;
2940                 if (*depth == 0 && a != NULL)
2941                         *a = NULL;
2942                 *rs = f->rs;
2943                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2944                         quick = fr->quick;
2945                 *r = TAILQ_NEXT(fr, entries);
2946         } while (*r == NULL);
2947
2948         return (quick);
2949 }
2950
2951 #ifdef INET6
2952 void
2953 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2954     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2955 {
2956         switch (af) {
2957 #ifdef INET
2958         case AF_INET:
2959                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2960                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2961                 break;
2962 #endif /* INET */
2963         case AF_INET6:
2964                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2965                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2966                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2967                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2968                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2969                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2970                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2971                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2972                 break;
2973         }
2974 }
2975
2976 void
2977 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2978 {
2979         switch (af) {
2980 #ifdef INET
2981         case AF_INET:
2982                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2983                 break;
2984 #endif /* INET */
2985         case AF_INET6:
2986                 if (addr->addr32[3] == 0xffffffff) {
2987                         addr->addr32[3] = 0;
2988                         if (addr->addr32[2] == 0xffffffff) {
2989                                 addr->addr32[2] = 0;
2990                                 if (addr->addr32[1] == 0xffffffff) {
2991                                         addr->addr32[1] = 0;
2992                                         addr->addr32[0] =
2993                                             htonl(ntohl(addr->addr32[0]) + 1);
2994                                 } else
2995                                         addr->addr32[1] =
2996                                             htonl(ntohl(addr->addr32[1]) + 1);
2997                         } else
2998                                 addr->addr32[2] =
2999                                     htonl(ntohl(addr->addr32[2]) + 1);
3000                 } else
3001                         addr->addr32[3] =
3002                             htonl(ntohl(addr->addr32[3]) + 1);
3003                 break;
3004         }
3005 }
3006 #endif /* INET6 */
3007
3008 int
3009 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
3010 {
3011         struct pf_addr          *saddr, *daddr;
3012         u_int16_t                sport, dport;
3013         struct inpcbinfo        *pi;
3014         struct inpcb            *inp;
3015
3016         pd->lookup.uid = UID_MAX;
3017         pd->lookup.gid = GID_MAX;
3018
3019         switch (pd->proto) {
3020         case IPPROTO_TCP:
3021                 if (pd->hdr.tcp == NULL)
3022                         return (-1);
3023                 sport = pd->hdr.tcp->th_sport;
3024                 dport = pd->hdr.tcp->th_dport;
3025                 pi = &V_tcbinfo;
3026                 break;
3027         case IPPROTO_UDP:
3028                 if (pd->hdr.udp == NULL)
3029                         return (-1);
3030                 sport = pd->hdr.udp->uh_sport;
3031                 dport = pd->hdr.udp->uh_dport;
3032                 pi = &V_udbinfo;
3033                 break;
3034         default:
3035                 return (-1);
3036         }
3037         if (direction == PF_IN) {
3038                 saddr = pd->src;
3039                 daddr = pd->dst;
3040         } else {
3041                 u_int16_t       p;
3042
3043                 p = sport;
3044                 sport = dport;
3045                 dport = p;
3046                 saddr = pd->dst;
3047                 daddr = pd->src;
3048         }
3049         switch (pd->af) {
3050 #ifdef INET
3051         case AF_INET:
3052                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
3053                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3054                 if (inp == NULL) {
3055                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
3056                            daddr->v4, dport, INPLOOKUP_WILDCARD |
3057                            INPLOOKUP_RLOCKPCB, NULL, m);
3058                         if (inp == NULL)
3059                                 return (-1);
3060                 }
3061                 break;
3062 #endif /* INET */
3063 #ifdef INET6
3064         case AF_INET6:
3065                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
3066                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3067                 if (inp == NULL) {
3068                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
3069                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
3070                             INPLOOKUP_RLOCKPCB, NULL, m);
3071                         if (inp == NULL)
3072                                 return (-1);
3073                 }
3074                 break;
3075 #endif /* INET6 */
3076
3077         default:
3078                 return (-1);
3079         }
3080         INP_RLOCK_ASSERT(inp);
3081         pd->lookup.uid = inp->inp_cred->cr_uid;
3082         pd->lookup.gid = inp->inp_cred->cr_groups[0];
3083         INP_RUNLOCK(inp);
3084
3085         return (1);
3086 }
3087
3088 static u_int8_t
3089 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3090 {
3091         int              hlen;
3092         u_int8_t         hdr[60];
3093         u_int8_t        *opt, optlen;
3094         u_int8_t         wscale = 0;
3095
3096         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3097         if (hlen <= sizeof(struct tcphdr))
3098                 return (0);
3099         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3100                 return (0);
3101         opt = hdr + sizeof(struct tcphdr);
3102         hlen -= sizeof(struct tcphdr);
3103         while (hlen >= 3) {
3104                 switch (*opt) {
3105                 case TCPOPT_EOL:
3106                 case TCPOPT_NOP:
3107                         ++opt;
3108                         --hlen;
3109                         break;
3110                 case TCPOPT_WINDOW:
3111                         wscale = opt[2];
3112                         if (wscale > TCP_MAX_WINSHIFT)
3113                                 wscale = TCP_MAX_WINSHIFT;
3114                         wscale |= PF_WSCALE_FLAG;
3115                         /* FALLTHROUGH */
3116                 default:
3117                         optlen = opt[1];
3118                         if (optlen < 2)
3119                                 optlen = 2;
3120                         hlen -= optlen;
3121                         opt += optlen;
3122                         break;
3123                 }
3124         }
3125         return (wscale);
3126 }
3127
3128 static u_int16_t
3129 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3130 {
3131         int              hlen;
3132         u_int8_t         hdr[60];
3133         u_int8_t        *opt, optlen;
3134         u_int16_t        mss = V_tcp_mssdflt;
3135
3136         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3137         if (hlen <= sizeof(struct tcphdr))
3138                 return (0);
3139         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3140                 return (0);
3141         opt = hdr + sizeof(struct tcphdr);
3142         hlen -= sizeof(struct tcphdr);
3143         while (hlen >= TCPOLEN_MAXSEG) {
3144                 switch (*opt) {
3145                 case TCPOPT_EOL:
3146                 case TCPOPT_NOP:
3147                         ++opt;
3148                         --hlen;
3149                         break;
3150                 case TCPOPT_MAXSEG:
3151                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3152                         NTOHS(mss);
3153                         /* FALLTHROUGH */
3154                 default:
3155                         optlen = opt[1];
3156                         if (optlen < 2)
3157                                 optlen = 2;
3158                         hlen -= optlen;
3159                         opt += optlen;
3160                         break;
3161                 }
3162         }
3163         return (mss);
3164 }
3165
3166 static u_int16_t
3167 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3168 {
3169 #ifdef INET
3170         struct nhop4_basic      nh4;
3171 #endif /* INET */
3172 #ifdef INET6
3173         struct nhop6_basic      nh6;
3174         struct in6_addr         dst6;
3175         uint32_t                scopeid;
3176 #endif /* INET6 */
3177         int                      hlen = 0;
3178         uint16_t                 mss = 0;
3179
3180         switch (af) {
3181 #ifdef INET
3182         case AF_INET:
3183                 hlen = sizeof(struct ip);
3184                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
3185                         mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
3186                 break;
3187 #endif /* INET */
3188 #ifdef INET6
3189         case AF_INET6:
3190                 hlen = sizeof(struct ip6_hdr);
3191                 in6_splitscope(&addr->v6, &dst6, &scopeid);
3192                 if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
3193                         mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
3194                 break;
3195 #endif /* INET6 */
3196         }
3197
3198         mss = max(V_tcp_mssdflt, mss);
3199         mss = min(mss, offer);
3200         mss = max(mss, 64);             /* sanity - at least max opt space */
3201         return (mss);
3202 }
3203
3204 static u_int32_t
3205 pf_tcp_iss(struct pf_pdesc *pd)
3206 {
3207         MD5_CTX ctx;
3208         u_int32_t digest[4];
3209
3210         if (V_pf_tcp_secret_init == 0) {
3211                 arc4random_buf(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3212                 MD5Init(&V_pf_tcp_secret_ctx);
3213                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3214                     sizeof(V_pf_tcp_secret));
3215                 V_pf_tcp_secret_init = 1;
3216         }
3217
3218         ctx = V_pf_tcp_secret_ctx;
3219
3220         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3221         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3222         if (pd->af == AF_INET6) {
3223                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3224                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3225         } else {
3226                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3227                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3228         }
3229         MD5Final((u_char *)digest, &ctx);
3230         V_pf_tcp_iss_off += 4096;
3231 #define ISN_RANDOM_INCREMENT (4096 - 1)
3232         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3233             V_pf_tcp_iss_off);
3234 #undef  ISN_RANDOM_INCREMENT
3235 }
3236
3237 static int
3238 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3239     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3240     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3241 {
3242         struct pf_rule          *nr = NULL;
3243         struct pf_addr          * const saddr = pd->src;
3244         struct pf_addr          * const daddr = pd->dst;
3245         sa_family_t              af = pd->af;
3246         struct pf_rule          *r, *a = NULL;
3247         struct pf_ruleset       *ruleset = NULL;
3248         struct pf_src_node      *nsn = NULL;
3249         struct tcphdr           *th = pd->hdr.tcp;
3250         struct pf_state_key     *sk = NULL, *nk = NULL;
3251         u_short                  reason;
3252         int                      rewrite = 0, hdrlen = 0;
3253         int                      tag = -1, rtableid = -1;
3254         int                      asd = 0;
3255         int                      match = 0;
3256         int                      state_icmp = 0;
3257         u_int16_t                sport = 0, dport = 0;
3258         u_int16_t                bproto_sum = 0, bip_sum = 0;
3259         u_int8_t                 icmptype = 0, icmpcode = 0;
3260         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3261
3262         PF_RULES_RASSERT();
3263
3264         if (inp != NULL) {
3265                 INP_LOCK_ASSERT(inp);
3266                 pd->lookup.uid = inp->inp_cred->cr_uid;
3267                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3268                 pd->lookup.done = 1;
3269         }
3270
3271         switch (pd->proto) {
3272         case IPPROTO_TCP:
3273                 sport = th->th_sport;
3274                 dport = th->th_dport;
3275                 hdrlen = sizeof(*th);
3276                 break;
3277         case IPPROTO_UDP:
3278                 sport = pd->hdr.udp->uh_sport;
3279                 dport = pd->hdr.udp->uh_dport;
3280                 hdrlen = sizeof(*pd->hdr.udp);
3281                 break;
3282 #ifdef INET
3283         case IPPROTO_ICMP:
3284                 if (pd->af != AF_INET)
3285                         break;
3286                 sport = dport = pd->hdr.icmp->icmp_id;
3287                 hdrlen = sizeof(*pd->hdr.icmp);
3288                 icmptype = pd->hdr.icmp->icmp_type;
3289                 icmpcode = pd->hdr.icmp->icmp_code;
3290
3291                 if (icmptype == ICMP_UNREACH ||
3292                     icmptype == ICMP_SOURCEQUENCH ||
3293                     icmptype == ICMP_REDIRECT ||
3294                     icmptype == ICMP_TIMXCEED ||
3295                     icmptype == ICMP_PARAMPROB)
3296                         state_icmp++;
3297                 break;
3298 #endif /* INET */
3299 #ifdef INET6
3300         case IPPROTO_ICMPV6:
3301                 if (af != AF_INET6)
3302                         break;
3303                 sport = dport = pd->hdr.icmp6->icmp6_id;
3304                 hdrlen = sizeof(*pd->hdr.icmp6);
3305                 icmptype = pd->hdr.icmp6->icmp6_type;
3306                 icmpcode = pd->hdr.icmp6->icmp6_code;
3307
3308                 if (icmptype == ICMP6_DST_UNREACH ||
3309                     icmptype == ICMP6_PACKET_TOO_BIG ||
3310                     icmptype == ICMP6_TIME_EXCEEDED ||
3311                     icmptype == ICMP6_PARAM_PROB)
3312                         state_icmp++;
3313                 break;
3314 #endif /* INET6 */
3315         default:
3316                 sport = dport = hdrlen = 0;
3317                 break;
3318         }
3319
3320         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3321
3322         /* check packet for BINAT/NAT/RDR */
3323         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3324             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3325                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3326                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3327
3328                 if (pd->ip_sum)
3329                         bip_sum = *pd->ip_sum;
3330
3331                 switch (pd->proto) {
3332                 case IPPROTO_TCP:
3333                         bproto_sum = th->th_sum;
3334                         pd->proto_sum = &th->th_sum;
3335
3336                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3337                             nk->port[pd->sidx] != sport) {
3338                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3339                                     &th->th_sum, &nk->addr[pd->sidx],
3340                                     nk->port[pd->sidx], 0, af);
3341                                 pd->sport = &th->th_sport;
3342                                 sport = th->th_sport;
3343                         }
3344
3345                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3346                             nk->port[pd->didx] != dport) {
3347                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3348                                     &th->th_sum, &nk->addr[pd->didx],
3349                                     nk->port[pd->didx], 0, af);
3350                                 dport = th->th_dport;
3351                                 pd->dport = &th->th_dport;
3352                         }
3353                         rewrite++;
3354                         break;
3355                 case IPPROTO_UDP:
3356                         bproto_sum = pd->hdr.udp->uh_sum;
3357                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3358
3359                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3360                             nk->port[pd->sidx] != sport) {
3361                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3362                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3363                                     &nk->addr[pd->sidx],
3364                                     nk->port[pd->sidx], 1, af);
3365                                 sport = pd->hdr.udp->uh_sport;
3366                                 pd->sport = &pd->hdr.udp->uh_sport;
3367                         }
3368
3369                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3370                             nk->port[pd->didx] != dport) {
3371                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3372                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3373                                     &nk->addr[pd->didx],
3374                                     nk->port[pd->didx], 1, af);
3375                                 dport = pd->hdr.udp->uh_dport;
3376                                 pd->dport = &pd->hdr.udp->uh_dport;
3377                         }
3378                         rewrite++;
3379                         break;
3380 #ifdef INET
3381                 case IPPROTO_ICMP:
3382                         nk->port[0] = nk->port[1];
3383                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3384                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3385                                     nk->addr[pd->sidx].v4.s_addr, 0);
3386
3387                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3388                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3389                                     nk->addr[pd->didx].v4.s_addr, 0);
3390
3391                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3392                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3393                                     pd->hdr.icmp->icmp_cksum, sport,
3394                                     nk->port[1], 0);
3395                                 pd->hdr.icmp->icmp_id = nk->port[1];
3396                                 pd->sport = &pd->hdr.icmp->icmp_id;
3397                         }
3398                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3399                         break;
3400 #endif /* INET */
3401 #ifdef INET6
3402                 case IPPROTO_ICMPV6:
3403                         nk->port[0] = nk->port[1];
3404                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3405                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3406                                     &nk->addr[pd->sidx], 0);
3407
3408                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3409                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3410                                     &nk->addr[pd->didx], 0);
3411                         rewrite++;
3412                         break;
3413 #endif /* INET */
3414                 default:
3415                         switch (af) {
3416 #ifdef INET
3417                         case AF_INET:
3418                                 if (PF_ANEQ(saddr,
3419                                     &nk->addr[pd->sidx], AF_INET))
3420                                         pf_change_a(&saddr->v4.s_addr,
3421                                             pd->ip_sum,
3422                                             nk->addr[pd->sidx].v4.s_addr, 0);
3423
3424                                 if (PF_ANEQ(daddr,
3425                                     &nk->addr[pd->didx], AF_INET))
3426                                         pf_change_a(&daddr->v4.s_addr,
3427                                             pd->ip_sum,
3428                                             nk->addr[pd->didx].v4.s_addr, 0);
3429                                 break;
3430 #endif /* INET */
3431 #ifdef INET6
3432                         case AF_INET6:
3433                                 if (PF_ANEQ(saddr,
3434                                     &nk->addr[pd->sidx], AF_INET6))
3435                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3436
3437                                 if (PF_ANEQ(daddr,
3438                                     &nk->addr[pd->didx], AF_INET6))
3439                                         PF_ACPY(daddr, &nk->addr[pd->didx], af);
3440                                 break;
3441 #endif /* INET */
3442                         }
3443                         break;
3444                 }
3445                 if (nr->natpass)
3446                         r = NULL;
3447                 pd->nat_rule = nr;
3448         }
3449
3450         while (r != NULL) {
3451                 r->evaluations++;
3452                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3453                         r = r->skip[PF_SKIP_IFP].ptr;
3454                 else if (r->direction && r->direction != direction)
3455                         r = r->skip[PF_SKIP_DIR].ptr;
3456                 else if (r->af && r->af != af)
3457                         r = r->skip[PF_SKIP_AF].ptr;
3458                 else if (r->proto && r->proto != pd->proto)
3459                         r = r->skip[PF_SKIP_PROTO].ptr;
3460                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3461                     r->src.neg, kif, M_GETFIB(m)))
3462                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3463                 /* tcp/udp only. port_op always 0 in other cases */
3464                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3465                     r->src.port[0], r->src.port[1], sport))
3466                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3467                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3468                     r->dst.neg, NULL, M_GETFIB(m)))
3469                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3470                 /* tcp/udp only. port_op always 0 in other cases */
3471                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3472                     r->dst.port[0], r->dst.port[1], dport))
3473                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3474                 /* icmp only. type always 0 in other cases */
3475                 else if (r->type && r->type != icmptype + 1)
3476                         r = TAILQ_NEXT(r, entries);
3477                 /* icmp only. type always 0 in other cases */
3478                 else if (r->code && r->code != icmpcode + 1)
3479                         r = TAILQ_NEXT(r, entries);
3480                 else if (r->tos && !(r->tos == pd->tos))
3481                         r = TAILQ_NEXT(r, entries);
3482                 else if (r->rule_flag & PFRULE_FRAGMENT)
3483                         r = TAILQ_NEXT(r, entries);
3484                 else if (pd->proto == IPPROTO_TCP &&
3485                     (r->flagset & th->th_flags) != r->flags)
3486                         r = TAILQ_NEXT(r, entries);
3487                 /* tcp/udp only. uid.op always 0 in other cases */
3488                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3489                     pf_socket_lookup(direction, pd, m), 1)) &&
3490                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3491                     pd->lookup.uid))
3492                         r = TAILQ_NEXT(r, entries);
3493                 /* tcp/udp only. gid.op always 0 in other cases */
3494                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3495                     pf_socket_lookup(direction, pd, m), 1)) &&
3496                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3497                     pd->lookup.gid))
3498                         r = TAILQ_NEXT(r, entries);
3499                 else if (r->prio &&
3500                     !pf_match_ieee8021q_pcp(r->prio, m))
3501                         r = TAILQ_NEXT(r, entries);
3502                 else if (r->prob &&
3503                     r->prob <= arc4random())
3504                         r = TAILQ_NEXT(r, entries);
3505                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3506                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3507                         r = TAILQ_NEXT(r, entries);
3508                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3509                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3510                     pf_osfp_fingerprint(pd, m, off, th),
3511                     r->os_fingerprint)))
3512                         r = TAILQ_NEXT(r, entries);
3513                 else {
3514                         if (r->tag)
3515                                 tag = r->tag;
3516                         if (r->rtableid >= 0)
3517                                 rtableid = r->rtableid;
3518                         if (r->anchor == NULL) {
3519                                 match = 1;
3520                                 *rm = r;
3521                                 *am = a;
3522                                 *rsm = ruleset;
3523                                 if ((*rm)->quick)
3524                                         break;
3525                                 r = TAILQ_NEXT(r, entries);
3526                         } else
3527                                 pf_step_into_anchor(anchor_stack, &asd,
3528                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3529                                     &match);
3530                 }
3531                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3532                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3533                         break;
3534         }
3535         r = *rm;
3536         a = *am;
3537         ruleset = *rsm;
3538
3539         REASON_SET(&reason, PFRES_MATCH);
3540
3541         if (r->log || (nr != NULL && nr->log)) {
3542                 if (rewrite)
3543                         m_copyback(m, off, hdrlen, pd->hdr.any);
3544                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3545                     ruleset, pd, 1);
3546         }
3547
3548         if ((r->action == PF_DROP) &&
3549             ((r->rule_flag & PFRULE_RETURNRST) ||
3550             (r->rule_flag & PFRULE_RETURNICMP) ||
3551             (r->rule_flag & PFRULE_RETURN))) {
3552                 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum,
3553                     bip_sum, hdrlen, &reason);
3554         }
3555
3556         if (r->action == PF_DROP)
3557                 goto cleanup;
3558
3559         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3560                 REASON_SET(&reason, PFRES_MEMORY);
3561                 goto cleanup;
3562         }
3563         if (rtableid >= 0)
3564                 M_SETFIB(m, rtableid);
3565
3566         if (!state_icmp && (r->keep_state || nr != NULL ||
3567             (pd->flags & PFDESC_TCP_NORM))) {
3568                 int action;
3569                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3570                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3571                     hdrlen);
3572                 if (action != PF_PASS) {
3573                         if (action == PF_DROP &&
3574                             (r->rule_flag & PFRULE_RETURN))
3575                                 pf_return(r, nr, pd, sk, off, m, th, kif,
3576                                     bproto_sum, bip_sum, hdrlen, &reason);
3577                         return (action);
3578                 }
3579         } else {
3580                 if (sk != NULL)
3581                         uma_zfree(V_pf_state_key_z, sk);
3582                 if (nk != NULL)
3583                         uma_zfree(V_pf_state_key_z, nk);
3584         }
3585
3586         /* copy back packet headers if we performed NAT operations */
3587         if (rewrite)
3588                 m_copyback(m, off, hdrlen, pd->hdr.any);
3589
3590         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3591             direction == PF_OUT &&
3592             V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m))
3593                 /*
3594                  * We want the state created, but we dont
3595                  * want to send this in case a partner
3596                  * firewall has to know about it to allow
3597                  * replies through it.
3598                  */
3599                 return (PF_DEFER);
3600
3601         return (PF_PASS);
3602
3603 cleanup:
3604         if (sk != NULL)
3605                 uma_zfree(V_pf_state_key_z, sk);
3606         if (nk != NULL)
3607                 uma_zfree(V_pf_state_key_z, nk);
3608         return (PF_DROP);
3609 }
3610
3611 static int
3612 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3613     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3614     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3615     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3616     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3617 {
3618         struct pf_state         *s = NULL;
3619         struct pf_src_node      *sn = NULL;
3620         struct tcphdr           *th = pd->hdr.tcp;
3621         u_int16_t                mss = V_tcp_mssdflt;
3622         u_short                  reason;
3623
3624         /* check maximums */
3625         if (r->max_states &&
3626             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3627                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3628                 REASON_SET(&reason, PFRES_MAXSTATES);
3629                 goto csfailed;
3630         }
3631         /* src node for filter rule */
3632         if ((r->rule_flag & PFRULE_SRCTRACK ||
3633             r->rpool.opts & PF_POOL_STICKYADDR) &&
3634             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3635                 REASON_SET(&reason, PFRES_SRCLIMIT);
3636                 goto csfailed;
3637         }
3638         /* src node for translation rule */
3639         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3640             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3641                 REASON_SET(&reason, PFRES_SRCLIMIT);
3642                 goto csfailed;
3643         }
3644         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3645         if (s == NULL) {
3646                 REASON_SET(&reason, PFRES_MEMORY);
3647                 goto csfailed;
3648         }
3649         s->rule.ptr = r;
3650         s->nat_rule.ptr = nr;
3651         s->anchor.ptr = a;
3652         STATE_INC_COUNTERS(s);
3653         if (r->allow_opts)
3654                 s->state_flags |= PFSTATE_ALLOWOPTS;
3655         if (r->rule_flag & PFRULE_STATESLOPPY)
3656                 s->state_flags |= PFSTATE_SLOPPY;
3657         s->log = r->log & PF_LOG_ALL;
3658         s->sync_state = PFSYNC_S_NONE;
3659         if (nr != NULL)
3660                 s->log |= nr->log & PF_LOG_ALL;
3661         switch (pd->proto) {
3662         case IPPROTO_TCP:
3663                 s->src.seqlo = ntohl(th->th_seq);
3664                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3665                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3666                     r->keep_state == PF_STATE_MODULATE) {
3667                         /* Generate sequence number modulator */
3668                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3669                             0)
3670                                 s->src.seqdiff = 1;
3671                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3672                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3673                         *rewrite = 1;
3674                 } else
3675                         s->src.seqdiff = 0;
3676                 if (th->th_flags & TH_SYN) {
3677                         s->src.seqhi++;
3678                         s->src.wscale = pf_get_wscale(m, off,
3679                             th->th_off, pd->af);
3680                 }
3681                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3682                 if (s->src.wscale & PF_WSCALE_MASK) {
3683                         /* Remove scale factor from initial window */
3684                         int win = s->src.max_win;
3685                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3686                         s->src.max_win = (win - 1) >>
3687                             (s->src.wscale & PF_WSCALE_MASK);
3688                 }
3689                 if (th->th_flags & TH_FIN)
3690                         s->src.seqhi++;
3691                 s->dst.seqhi = 1;
3692                 s->dst.max_win = 1;
3693                 s->src.state = TCPS_SYN_SENT;
3694                 s->dst.state = TCPS_CLOSED;
3695                 s->timeout = PFTM_TCP_FIRST_PACKET;
3696                 break;
3697         case IPPROTO_UDP:
3698                 s->src.state = PFUDPS_SINGLE;
3699                 s->dst.state = PFUDPS_NO_TRAFFIC;
3700                 s->timeout = PFTM_UDP_FIRST_PACKET;
3701                 break;
3702         case IPPROTO_ICMP:
3703 #ifdef INET6
3704         case IPPROTO_ICMPV6:
3705 #endif
3706                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3707                 break;
3708         default:
3709                 s->src.state = PFOTHERS_SINGLE;
3710                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3711                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3712         }
3713
3714         if (r->rt) {
3715                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3716                         REASON_SET(&reason, PFRES_MAPFAILED);
3717                         pf_src_tree_remove_state(s);
3718                         STATE_DEC_COUNTERS(s);
3719                         uma_zfree(V_pf_state_z, s);
3720                         goto csfailed;
3721                 }
3722                 s->rt_kif = r->rpool.cur->kif;
3723         }
3724
3725         s->creation = time_uptime;
3726         s->expire = time_uptime;
3727
3728         if (sn != NULL)
3729                 s->src_node = sn;
3730         if (nsn != NULL) {
3731                 /* XXX We only modify one side for now. */
3732                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3733                 s->nat_src_node = nsn;
3734         }
3735         if (pd->proto == IPPROTO_TCP) {
3736                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3737                     off, pd, th, &s->src, &s->dst)) {
3738                         REASON_SET(&reason, PFRES_MEMORY);
3739                         pf_src_tree_remove_state(s);
3740                         STATE_DEC_COUNTERS(s);
3741                         uma_zfree(V_pf_state_z, s);
3742                         return (PF_DROP);
3743                 }
3744                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3745                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3746                     &s->src, &s->dst, rewrite)) {
3747                         /* This really shouldn't happen!!! */
3748                         DPFPRINTF(PF_DEBUG_URGENT,
3749                             ("pf_normalize_tcp_stateful failed on first pkt"));
3750                         pf_normalize_tcp_cleanup(s);
3751                         pf_src_tree_remove_state(s);
3752                         STATE_DEC_COUNTERS(s);
3753                         uma_zfree(V_pf_state_z, s);
3754                         return (PF_DROP);
3755                 }
3756         }
3757         s->direction = pd->dir;
3758
3759         /*
3760          * sk/nk could already been setup by pf_get_translation().
3761          */
3762         if (nr == NULL) {
3763                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3764                     __func__, nr, sk, nk));
3765                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3766                 if (sk == NULL)
3767                         goto csfailed;
3768                 nk = sk;
3769         } else
3770                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3771                     __func__, nr, sk, nk));
3772
3773         /* Swap sk/nk for PF_OUT. */
3774         if (pf_state_insert(BOUND_IFACE(r, kif),
3775             (pd->dir == PF_IN) ? sk : nk,
3776             (pd->dir == PF_IN) ? nk : sk, s)) {
3777                 if (pd->proto == IPPROTO_TCP)
3778                         pf_normalize_tcp_cleanup(s);
3779                 REASON_SET(&reason, PFRES_STATEINS);
3780                 pf_src_tree_remove_state(s);
3781                 STATE_DEC_COUNTERS(s);
3782                 uma_zfree(V_pf_state_z, s);
3783                 return (PF_DROP);
3784         } else
3785                 *sm = s;
3786
3787         if (tag > 0)
3788                 s->tag = tag;
3789         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3790             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3791                 s->src.state = PF_TCPS_PROXY_SRC;
3792                 /* undo NAT changes, if they have taken place */
3793                 if (nr != NULL) {
3794                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3795                         if (pd->dir == PF_OUT)
3796                                 skt = s->key[PF_SK_STACK];
3797                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3798                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3799                         if (pd->sport)
3800                                 *pd->sport = skt->port[pd->sidx];
3801                         if (pd->dport)
3802                                 *pd->dport = skt->port[pd->didx];
3803                         if (pd->proto_sum)
3804                                 *pd->proto_sum = bproto_sum;
3805                         if (pd->ip_sum)
3806                                 *pd->ip_sum = bip_sum;
3807                         m_copyback(m, off, hdrlen, pd->hdr.any);
3808                 }
3809                 s->src.seqhi = htonl(arc4random());
3810                 /* Find mss option */
3811                 int rtid = M_GETFIB(m);
3812                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3813                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3814                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3815                 s->src.mss = mss;
3816                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3817                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3818                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3819                 REASON_SET(&reason, PFRES_SYNPROXY);
3820                 return (PF_SYNPROXY_DROP);
3821         }
3822
3823         return (PF_PASS);
3824
3825 csfailed:
3826         if (sk != NULL)
3827                 uma_zfree(V_pf_state_key_z, sk);
3828         if (nk != NULL)
3829                 uma_zfree(V_pf_state_key_z, nk);
3830
3831         if (sn != NULL) {
3832                 struct pf_srchash *sh;
3833
3834                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
3835                 PF_HASHROW_LOCK(sh);
3836                 if (--sn->states == 0 && sn->expire == 0) {
3837                         pf_unlink_src_node(sn);
3838                         uma_zfree(V_pf_sources_z, sn);
3839                         counter_u64_add(
3840                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3841                 }
3842                 PF_HASHROW_UNLOCK(sh);
3843         }
3844
3845         if (nsn != sn && nsn != NULL) {
3846                 struct pf_srchash *sh;
3847
3848                 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
3849                 PF_HASHROW_LOCK(sh);
3850                 if (--nsn->states == 0 && nsn->expire == 0) {
3851                         pf_unlink_src_node(nsn);
3852                         uma_zfree(V_pf_sources_z, nsn);
3853                         counter_u64_add(
3854                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3855                 }
3856                 PF_HASHROW_UNLOCK(sh);
3857         }
3858
3859         return (PF_DROP);
3860 }
3861
3862 static int
3863 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3864     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3865     struct pf_ruleset **rsm)
3866 {
3867         struct pf_rule          *r, *a = NULL;
3868         struct pf_ruleset       *ruleset = NULL;
3869         sa_family_t              af = pd->af;
3870         u_short                  reason;
3871         int                      tag = -1;
3872         int                      asd = 0;
3873         int                      match = 0;
3874         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3875
3876         PF_RULES_RASSERT();
3877
3878         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3879         while (r != NULL) {
3880                 r->evaluations++;
3881                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3882                         r = r->skip[PF_SKIP_IFP].ptr;
3883                 else if (r->direction && r->direction != direction)
3884                         r = r->skip[PF_SKIP_DIR].ptr;
3885                 else if (r->af && r->af != af)
3886                         r = r->skip[PF_SKIP_AF].ptr;
3887                 else if (r->proto && r->proto != pd->proto)
3888                         r = r->skip[PF_SKIP_PROTO].ptr;
3889                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3890                     r->src.neg, kif, M_GETFIB(m)))
3891                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3892                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3893                     r->dst.neg, NULL, M_GETFIB(m)))
3894                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3895                 else if (r->tos && !(r->tos == pd->tos))
3896                         r = TAILQ_NEXT(r, entries);
3897                 else if (r->os_fingerprint != PF_OSFP_ANY)
3898                         r = TAILQ_NEXT(r, entries);
3899                 else if (pd->proto == IPPROTO_UDP &&
3900                     (r->src.port_op || r->dst.port_op))
3901                         r = TAILQ_NEXT(r, entries);
3902                 else if (pd->proto == IPPROTO_TCP &&
3903                     (r->src.port_op || r->dst.port_op || r->flagset))
3904                         r = TAILQ_NEXT(r, entries);
3905                 else if ((pd->proto == IPPROTO_ICMP ||
3906                     pd->proto == IPPROTO_ICMPV6) &&
3907                     (r->type || r->code))
3908                         r = TAILQ_NEXT(r, entries);
3909                 else if (r->prio &&
3910                     !pf_match_ieee8021q_pcp(r->prio, m))
3911                         r = TAILQ_NEXT(r, entries);
3912                 else if (r->prob && r->prob <=
3913                     (arc4random() % (UINT_MAX - 1) + 1))
3914                         r = TAILQ_NEXT(r, entries);
3915                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3916                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3917                         r = TAILQ_NEXT(r, entries);
3918                 else {
3919                         if (r->anchor == NULL) {
3920                                 match = 1;
3921                                 *rm = r;
3922                                 *am = a;
3923                                 *rsm = ruleset;
3924                                 if ((*rm)->quick)
3925                                         break;
3926                                 r = TAILQ_NEXT(r, entries);
3927                         } else
3928                                 pf_step_into_anchor(anchor_stack, &asd,
3929                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3930                                     &match);
3931                 }
3932                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3933                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3934                         break;
3935         }
3936         r = *rm;
3937         a = *am;
3938         ruleset = *rsm;
3939
3940         REASON_SET(&reason, PFRES_MATCH);
3941
3942         if (r->log)
3943                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3944                     1);
3945
3946         if (r->action != PF_PASS)
3947                 return (PF_DROP);
3948
3949         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3950                 REASON_SET(&reason, PFRES_MEMORY);
3951                 return (PF_DROP);
3952         }
3953
3954         return (PF_PASS);
3955 }
3956
3957 static int
3958 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3959         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3960         struct pf_pdesc *pd, u_short *reason, int *copyback)
3961 {
3962         struct tcphdr           *th = pd->hdr.tcp;
3963         u_int16_t                win = ntohs(th->th_win);
3964         u_int32_t                ack, end, seq, orig_seq;
3965         u_int8_t                 sws, dws;
3966         int                      ackskew;
3967
3968         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3969                 sws = src->wscale & PF_WSCALE_MASK;
3970                 dws = dst->wscale & PF_WSCALE_MASK;
3971         } else
3972                 sws = dws = 0;
3973
3974         /*
3975          * Sequence tracking algorithm from Guido van Rooij's paper:
3976          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3977          *      tcp_filtering.ps
3978          */
3979
3980         orig_seq = seq = ntohl(th->th_seq);
3981         if (src->seqlo == 0) {
3982                 /* First packet from this end. Set its state */
3983
3984                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3985                     src->scrub == NULL) {
3986                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3987                                 REASON_SET(reason, PFRES_MEMORY);
3988                                 return (PF_DROP);
3989                         }
3990                 }
3991
3992                 /* Deferred generation of sequence number modulator */
3993                 if (dst->seqdiff && !src->seqdiff) {
3994                         /* use random iss for the TCP server */
3995                         while ((src->seqdiff = arc4random() - seq) == 0)
3996                                 ;
3997                         ack = ntohl(th->th_ack) - dst->seqdiff;
3998                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3999                             src->seqdiff), 0);
4000                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4001                         *copyback = 1;
4002                 } else {
4003                         ack = ntohl(th->th_ack);
4004                 }
4005
4006                 end = seq + pd->p_len;
4007                 if (th->th_flags & TH_SYN) {
4008                         end++;
4009                         if (dst->wscale & PF_WSCALE_FLAG) {
4010                                 src->wscale = pf_get_wscale(m, off, th->th_off,
4011                                     pd->af);
4012                                 if (src->wscale & PF_WSCALE_FLAG) {
4013                                         /* Remove scale factor from initial
4014                                          * window */
4015                                         sws = src->wscale & PF_WSCALE_MASK;
4016                                         win = ((u_int32_t)win + (1 << sws) - 1)
4017                                             >> sws;
4018                                         dws = dst->wscale & PF_WSCALE_MASK;
4019                                 } else {
4020                                         /* fixup other window */
4021                                         dst->max_win <<= dst->wscale &
4022                                             PF_WSCALE_MASK;
4023                                         /* in case of a retrans SYN|ACK */
4024                                         dst->wscale = 0;
4025                                 }
4026                         }
4027                 }
4028                 if (th->th_flags & TH_FIN)
4029                         end++;
4030
4031                 src->seqlo = seq;
4032                 if (src->state < TCPS_SYN_SENT)
4033                         src->state = TCPS_SYN_SENT;
4034
4035                 /*
4036                  * May need to slide the window (seqhi may have been set by
4037                  * the crappy stack check or if we picked up the connection
4038                  * after establishment)
4039                  */
4040                 if (src->seqhi == 1 ||
4041                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4042                         src->seqhi = end + MAX(1, dst->max_win << dws);
4043                 if (win > src->max_win)
4044                         src->max_win = win;
4045
4046         } else {
4047                 ack = ntohl(th->th_ack) - dst->seqdiff;
4048                 if (src->seqdiff) {
4049                         /* Modulate sequence numbers */
4050                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4051                             src->seqdiff), 0);
4052                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4053                         *copyback = 1;
4054                 }
4055                 end = seq + pd->p_len;
4056                 if (th->th_flags & TH_SYN)
4057                         end++;
4058                 if (th->th_flags & TH_FIN)
4059                         end++;
4060         }
4061
4062         if ((th->th_flags & TH_ACK) == 0) {
4063                 /* Let it pass through the ack skew check */
4064                 ack = dst->seqlo;
4065         } else if ((ack == 0 &&
4066             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4067             /* broken tcp stacks do not set ack */
4068             (dst->state < TCPS_SYN_SENT)) {
4069                 /*
4070                  * Many stacks (ours included) will set the ACK number in an
4071                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4072                  */
4073                 ack = dst->seqlo;
4074         }
4075
4076         if (seq == end) {
4077                 /* Ease sequencing restrictions on no data packets */
4078                 seq = src->seqlo;
4079                 end = seq;
4080         }
4081
4082         ackskew = dst->seqlo - ack;
4083
4084
4085         /*
4086          * Need to demodulate the sequence numbers in any TCP SACK options
4087          * (Selective ACK). We could optionally validate the SACK values
4088          * against the current ACK window, either forwards or backwards, but
4089          * I'm not confident that SACK has been implemented properly
4090          * everywhere. It wouldn't surprise me if several stacks accidentally
4091          * SACK too far backwards of previously ACKed data. There really aren't
4092          * any security implications of bad SACKing unless the target stack
4093          * doesn't validate the option length correctly. Someone trying to
4094          * spoof into a TCP connection won't bother blindly sending SACK
4095          * options anyway.
4096          */
4097         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4098                 if (pf_modulate_sack(m, off, pd, th, dst))
4099                         *copyback = 1;
4100         }
4101
4102
4103 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4104         if (SEQ_GEQ(src->seqhi, end) &&
4105             /* Last octet inside other's window space */
4106             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4107             /* Retrans: not more than one window back */
4108             (ackskew >= -MAXACKWINDOW) &&
4109             /* Acking not more than one reassembled fragment backwards */
4110             (ackskew <= (MAXACKWINDOW << sws)) &&
4111             /* Acking not more than one window forward */
4112             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4113             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4114             (pd->flags & PFDESC_IP_REAS) == 0)) {
4115             /* Require an exact/+1 sequence match on resets when possible */
4116
4117                 if (dst->scrub || src->scrub) {
4118                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4119                             *state, src, dst, copyback))
4120                                 return (PF_DROP);
4121                 }
4122
4123                 /* update max window */
4124                 if (src->max_win < win)
4125                         src->max_win = win;
4126                 /* synchronize sequencing */
4127                 if (SEQ_GT(end, src->seqlo))
4128                         src->seqlo = end;
4129                 /* slide the window of what the other end can send */
4130                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4131                         dst->seqhi = ack + MAX((win << sws), 1);
4132
4133
4134                 /* update states */
4135                 if (th->th_flags & TH_SYN)
4136                         if (src->state < TCPS_SYN_SENT)
4137                                 src->state = TCPS_SYN_SENT;
4138                 if (th->th_flags & TH_FIN)
4139                         if (src->state < TCPS_CLOSING)
4140                                 src->state = TCPS_CLOSING;
4141                 if (th->th_flags & TH_ACK) {
4142                         if (dst->state == TCPS_SYN_SENT) {
4143                                 dst->state = TCPS_ESTABLISHED;
4144                                 if (src->state == TCPS_ESTABLISHED &&
4145                                     (*state)->src_node != NULL &&
4146                                     pf_src_connlimit(state)) {
4147                                         REASON_SET(reason, PFRES_SRCLIMIT);
4148                                         return (PF_DROP);
4149                                 }
4150                         } else if (dst->state == TCPS_CLOSING)
4151                                 dst->state = TCPS_FIN_WAIT_2;
4152                 }
4153                 if (th->th_flags & TH_RST)
4154                         src->state = dst->state = TCPS_TIME_WAIT;
4155
4156                 /* update expire time */
4157                 (*state)->expire = time_uptime;
4158                 if (src->state >= TCPS_FIN_WAIT_2 &&
4159                     dst->state >= TCPS_FIN_WAIT_2)
4160                         (*state)->timeout = PFTM_TCP_CLOSED;
4161                 else if (src->state >= TCPS_CLOSING &&
4162                     dst->state >= TCPS_CLOSING)
4163                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4164                 else if (src->state < TCPS_ESTABLISHED ||
4165                     dst->state < TCPS_ESTABLISHED)
4166                         (*state)->timeout = PFTM_TCP_OPENING;
4167                 else if (src->state >= TCPS_CLOSING ||
4168                     dst->state >= TCPS_CLOSING)
4169                         (*state)->timeout = PFTM_TCP_CLOSING;
4170                 else
4171                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4172
4173                 /* Fall through to PASS packet */
4174
4175         } else if ((dst->state < TCPS_SYN_SENT ||
4176                 dst->state >= TCPS_FIN_WAIT_2 ||
4177                 src->state >= TCPS_FIN_WAIT_2) &&
4178             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4179             /* Within a window forward of the originating packet */
4180             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4181             /* Within a window backward of the originating packet */
4182
4183                 /*
4184                  * This currently handles three situations:
4185                  *  1) Stupid stacks will shotgun SYNs before their peer
4186                  *     replies.
4187                  *  2) When PF catches an already established stream (the
4188                  *     firewall rebooted, the state table was flushed, routes
4189                  *     changed...)
4190                  *  3) Packets get funky immediately after the connection
4191                  *     closes (this should catch Solaris spurious ACK|FINs
4192                  *     that web servers like to spew after a close)
4193                  *
4194                  * This must be a little more careful than the above code
4195                  * since packet floods will also be caught here. We don't
4196                  * update the TTL here to mitigate the damage of a packet
4197                  * flood and so the same code can handle awkward establishment
4198                  * and a loosened connection close.
4199                  * In the establishment case, a correct peer response will
4200                  * validate the connection, go through the normal state code
4201                  * and keep updating the state TTL.
4202                  */
4203
4204                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4205                         printf("pf: loose state match: ");
4206                         pf_print_state(*state);
4207                         pf_print_flags(th->th_flags);
4208                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4209                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4210                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4211                             (unsigned long long)(*state)->packets[1],
4212                             pd->dir == PF_IN ? "in" : "out",
4213                             pd->dir == (*state)->direction ? "fwd" : "rev");
4214                 }
4215
4216                 if (dst->scrub || src->scrub) {
4217                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4218                             *state, src, dst, copyback))
4219                                 return (PF_DROP);
4220                 }
4221
4222                 /* update max window */
4223                 if (src->max_win < win)
4224                         src->max_win = win;
4225                 /* synchronize sequencing */
4226                 if (SEQ_GT(end, src->seqlo))
4227                         src->seqlo = end;
4228                 /* slide the window of what the other end can send */
4229                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4230                         dst->seqhi = ack + MAX((win << sws), 1);
4231
4232                 /*
4233                  * Cannot set dst->seqhi here since this could be a shotgunned
4234                  * SYN and not an already established connection.
4235                  */
4236
4237                 if (th->th_flags & TH_FIN)
4238                         if (src->state < TCPS_CLOSING)
4239                                 src->state = TCPS_CLOSING;
4240                 if (th->th_flags & TH_RST)
4241                         src->state = dst->state = TCPS_TIME_WAIT;
4242
4243                 /* Fall through to PASS packet */
4244
4245         } else {
4246                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4247                     (*state)->src.state == TCPS_SYN_SENT) {
4248                         /* Send RST for state mismatches during handshake */
4249                         if (!(th->th_flags & TH_RST))
4250                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4251                                     pd->dst, pd->src, th->th_dport,
4252                                     th->th_sport, ntohl(th->th_ack), 0,
4253                                     TH_RST, 0, 0,
4254                                     (*state)->rule.ptr->return_ttl, 1, 0,
4255                                     kif->pfik_ifp);
4256                         src->seqlo = 0;
4257                         src->seqhi = 1;
4258                         src->max_win = 1;
4259                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4260                         printf("pf: BAD state: ");
4261                         pf_print_state(*state);
4262                         pf_print_flags(th->th_flags);
4263                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4264                             "pkts=%llu:%llu dir=%s,%s\n",
4265                             seq, orig_seq, ack, pd->p_len, ackskew,
4266                             (unsigned long long)(*state)->packets[0],
4267                             (unsigned long long)(*state)->packets[1],
4268                             pd->dir == PF_IN ? "in" : "out",
4269                             pd->dir == (*state)->direction ? "fwd" : "rev");
4270                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4271                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4272                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4273                             ' ': '2',
4274                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4275                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4276                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4277                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4278                 }
4279                 REASON_SET(reason, PFRES_BADSTATE);
4280                 return (PF_DROP);
4281         }
4282
4283         return (PF_PASS);
4284 }
4285
4286 static int
4287 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4288         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4289 {
4290         struct tcphdr           *th = pd->hdr.tcp;
4291
4292         if (th->th_flags & TH_SYN)
4293                 if (src->state < TCPS_SYN_SENT)
4294                         src->state = TCPS_SYN_SENT;
4295         if (th->th_flags & TH_FIN)
4296                 if (src->state < TCPS_CLOSING)
4297                         src->state = TCPS_CLOSING;
4298         if (th->th_flags & TH_ACK) {
4299                 if (dst->state == TCPS_SYN_SENT) {
4300                         dst->state = TCPS_ESTABLISHED;
4301                         if (src->state == TCPS_ESTABLISHED &&
4302                             (*state)->src_node != NULL &&
4303                             pf_src_connlimit(state)) {
4304                                 REASON_SET(reason, PFRES_SRCLIMIT);
4305                                 return (PF_DROP);
4306                         }
4307                 } else if (dst->state == TCPS_CLOSING) {
4308                         dst->state = TCPS_FIN_WAIT_2;
4309                 } else if (src->state == TCPS_SYN_SENT &&
4310                     dst->state < TCPS_SYN_SENT) {
4311                         /*
4312                          * Handle a special sloppy case where we only see one
4313                          * half of the connection. If there is a ACK after
4314                          * the initial SYN without ever seeing a packet from
4315                          * the destination, set the connection to established.
4316                          */
4317                         dst->state = src->state = TCPS_ESTABLISHED;
4318                         if ((*state)->src_node != NULL &&
4319                             pf_src_connlimit(state)) {
4320                                 REASON_SET(reason, PFRES_SRCLIMIT);
4321                                 return (PF_DROP);
4322                         }
4323                 } else if (src->state == TCPS_CLOSING &&
4324                     dst->state == TCPS_ESTABLISHED &&
4325                     dst->seqlo == 0) {
4326                         /*
4327                          * Handle the closing of half connections where we
4328                          * don't see the full bidirectional FIN/ACK+ACK
4329                          * handshake.
4330                          */
4331                         dst->state = TCPS_CLOSING;
4332                 }
4333         }
4334         if (th->th_flags & TH_RST)
4335                 src->state = dst->state = TCPS_TIME_WAIT;
4336
4337         /* update expire time */
4338         (*state)->expire = time_uptime;
4339         if (src->state >= TCPS_FIN_WAIT_2 &&
4340             dst->state >= TCPS_FIN_WAIT_2)
4341                 (*state)->timeout = PFTM_TCP_CLOSED;
4342         else if (src->state >= TCPS_CLOSING &&
4343             dst->state >= TCPS_CLOSING)
4344                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4345         else if (src->state < TCPS_ESTABLISHED ||
4346             dst->state < TCPS_ESTABLISHED)
4347                 (*state)->timeout = PFTM_TCP_OPENING;
4348         else if (src->state >= TCPS_CLOSING ||
4349             dst->state >= TCPS_CLOSING)
4350                 (*state)->timeout = PFTM_TCP_CLOSING;
4351         else
4352                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4353
4354         return (PF_PASS);
4355 }
4356
4357 static int
4358 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4359     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4360     u_short *reason)
4361 {
4362         struct pf_state_key_cmp  key;
4363         struct tcphdr           *th = pd->hdr.tcp;
4364         int                      copyback = 0;
4365         struct pf_state_peer    *src, *dst;
4366         struct pf_state_key     *sk;
4367
4368         bzero(&key, sizeof(key));
4369         key.af = pd->af;
4370         key.proto = IPPROTO_TCP;
4371         if (direction == PF_IN) {       /* wire side, straight */
4372                 PF_ACPY(&key.addr[0], pd->src, key.af);
4373                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4374                 key.port[0] = th->th_sport;
4375                 key.port[1] = th->th_dport;
4376         } else {                        /* stack side, reverse */
4377                 PF_ACPY(&key.addr[1], pd->src, key.af);
4378                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4379                 key.port[1] = th->th_sport;
4380                 key.port[0] = th->th_dport;
4381         }
4382
4383         STATE_LOOKUP(kif, &key, direction, *state, pd);
4384
4385         if (direction == (*state)->direction) {
4386                 src = &(*state)->src;
4387                 dst = &(*state)->dst;
4388         } else {
4389                 src = &(*state)->dst;
4390                 dst = &(*state)->src;
4391         }
4392
4393         sk = (*state)->key[pd->didx];
4394
4395         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4396                 if (direction != (*state)->direction) {
4397                         REASON_SET(reason, PFRES_SYNPROXY);
4398                         return (PF_SYNPROXY_DROP);
4399                 }
4400                 if (th->th_flags & TH_SYN) {
4401                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4402                                 REASON_SET(reason, PFRES_SYNPROXY);
4403                                 return (PF_DROP);
4404                         }
4405                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4406                             pd->src, th->th_dport, th->th_sport,
4407                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4408                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4409                         REASON_SET(reason, PFRES_SYNPROXY);
4410                         return (PF_SYNPROXY_DROP);
4411                 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK ||
4412                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4413                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4414                         REASON_SET(reason, PFRES_SYNPROXY);
4415                         return (PF_DROP);
4416                 } else if ((*state)->src_node != NULL &&
4417                     pf_src_connlimit(state)) {
4418                         REASON_SET(reason, PFRES_SRCLIMIT);
4419                         return (PF_DROP);
4420                 } else
4421                         (*state)->src.state = PF_TCPS_PROXY_DST;
4422         }
4423         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4424                 if (direction == (*state)->direction) {
4425                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4426                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4427                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4428                                 REASON_SET(reason, PFRES_SYNPROXY);
4429                                 return (PF_DROP);
4430                         }
4431                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4432                         if ((*state)->dst.seqhi == 1)
4433                                 (*state)->dst.seqhi = htonl(arc4random());
4434                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4435                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4436                             sk->port[pd->sidx], sk->port[pd->didx],
4437                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4438                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4439                         REASON_SET(reason, PFRES_SYNPROXY);
4440                         return (PF_SYNPROXY_DROP);
4441                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4442                     (TH_SYN|TH_ACK)) ||
4443                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4444                         REASON_SET(reason, PFRES_SYNPROXY);
4445                         return (PF_DROP);
4446                 } else {
4447                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4448                         (*state)->dst.seqlo = ntohl(th->th_seq);
4449                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4450                             pd->src, th->th_dport, th->th_sport,
4451                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4452                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4453                             (*state)->tag, NULL);
4454                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4455                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4456                             sk->port[pd->sidx], sk->port[pd->didx],
4457                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4458                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4459                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4460                             (*state)->src.seqlo;
4461                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4462                             (*state)->dst.seqlo;
4463                         (*state)->src.seqhi = (*state)->src.seqlo +
4464                             (*state)->dst.max_win;
4465                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4466                             (*state)->src.max_win;
4467                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4468                         (*state)->src.state = (*state)->dst.state =
4469                             TCPS_ESTABLISHED;
4470                         REASON_SET(reason, PFRES_SYNPROXY);
4471                         return (PF_SYNPROXY_DROP);
4472                 }
4473         }
4474
4475         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4476             dst->state >= TCPS_FIN_WAIT_2 &&
4477             src->state >= TCPS_FIN_WAIT_2) {
4478                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4479                         printf("pf: state reuse ");
4480                         pf_print_state(*state);
4481                         pf_print_flags(th->th_flags);
4482                         printf("\n");
4483                 }
4484                 /* XXX make sure it's the same direction ?? */
4485                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4486                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4487                 *state = NULL;
4488                 return (PF_DROP);
4489         }
4490
4491         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4492                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4493                         return (PF_DROP);
4494         } else {
4495                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4496                     &copyback) == PF_DROP)
4497                         return (PF_DROP);
4498         }
4499
4500         /* translate source/destination address, if necessary */
4501         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4502                 struct pf_state_key *nk = (*state)->key[pd->didx];
4503
4504                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4505                     nk->port[pd->sidx] != th->th_sport)
4506                         pf_change_ap(m, pd->src, &th->th_sport,
4507                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4508                             nk->port[pd->sidx], 0, pd->af);
4509
4510                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4511                     nk->port[pd->didx] != th->th_dport)
4512                         pf_change_ap(m, pd->dst, &th->th_dport,
4513                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4514                             nk->port[pd->didx], 0, pd->af);
4515                 copyback = 1;
4516         }
4517
4518         /* Copyback sequence modulation or stateful scrub changes if needed */
4519         if (copyback)
4520                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4521
4522         return (PF_PASS);
4523 }
4524
4525 static int
4526 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4527     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4528 {
4529         struct pf_state_peer    *src, *dst;
4530         struct pf_state_key_cmp  key;
4531         struct udphdr           *uh = pd->hdr.udp;
4532
4533         bzero(&key, sizeof(key));
4534         key.af = pd->af;
4535         key.proto = IPPROTO_UDP;
4536         if (direction == PF_IN) {       /* wire side, straight */
4537                 PF_ACPY(&key.addr[0], pd->src, key.af);
4538                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4539                 key.port[0] = uh->uh_sport;
4540                 key.port[1] = uh->uh_dport;
4541         } else {                        /* stack side, reverse */
4542                 PF_ACPY(&key.addr[1], pd->src, key.af);
4543                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4544                 key.port[1] = uh->uh_sport;
4545                 key.port[0] = uh->uh_dport;
4546         }
4547
4548         STATE_LOOKUP(kif, &key, direction, *state, pd);
4549
4550         if (direction == (*state)->direction) {
4551                 src = &(*state)->src;
4552                 dst = &(*state)->dst;
4553         } else {
4554                 src = &(*state)->dst;
4555                 dst = &(*state)->src;
4556         }
4557
4558         /* update states */
4559         if (src->state < PFUDPS_SINGLE)
4560                 src->state = PFUDPS_SINGLE;
4561         if (dst->state == PFUDPS_SINGLE)
4562                 dst->state = PFUDPS_MULTIPLE;
4563
4564         /* update expire time */
4565         (*state)->expire = time_uptime;
4566         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4567                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4568         else
4569                 (*state)->timeout = PFTM_UDP_SINGLE;
4570
4571         /* translate source/destination address, if necessary */
4572         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4573                 struct pf_state_key *nk = (*state)->key[pd->didx];
4574
4575                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4576                     nk->port[pd->sidx] != uh->uh_sport)
4577                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4578                             &uh->uh_sum, &nk->addr[pd->sidx],
4579                             nk->port[pd->sidx], 1, pd->af);
4580
4581                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4582                     nk->port[pd->didx] != uh->uh_dport)
4583                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4584                             &uh->uh_sum, &nk->addr[pd->didx],
4585                             nk->port[pd->didx], 1, pd->af);
4586                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4587         }
4588
4589         return (PF_PASS);
4590 }
4591
4592 static int
4593 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4594     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4595 {
4596         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4597         u_int16_t        icmpid = 0, *icmpsum;
4598         u_int8_t         icmptype, icmpcode;
4599         int              state_icmp = 0;
4600         struct pf_state_key_cmp key;
4601
4602         bzero(&key, sizeof(key));
4603         switch (pd->proto) {
4604 #ifdef INET
4605         case IPPROTO_ICMP:
4606                 icmptype = pd->hdr.icmp->icmp_type;
4607                 icmpcode = pd->hdr.icmp->icmp_code;
4608                 icmpid = pd->hdr.icmp->icmp_id;
4609                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4610
4611                 if (icmptype == ICMP_UNREACH ||
4612                     icmptype == ICMP_SOURCEQUENCH ||
4613                     icmptype == ICMP_REDIRECT ||
4614                     icmptype == ICMP_TIMXCEED ||
4615                     icmptype == ICMP_PARAMPROB)
4616                         state_icmp++;
4617                 break;
4618 #endif /* INET */
4619 #ifdef INET6
4620         case IPPROTO_ICMPV6:
4621                 icmptype = pd->hdr.icmp6->icmp6_type;
4622                 icmpcode = pd->hdr.icmp6->icmp6_code;
4623                 icmpid = pd->hdr.icmp6->icmp6_id;
4624                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4625
4626                 if (icmptype == ICMP6_DST_UNREACH ||
4627                     icmptype == ICMP6_PACKET_TOO_BIG ||
4628                     icmptype == ICMP6_TIME_EXCEEDED ||
4629                     icmptype == ICMP6_PARAM_PROB)
4630                         state_icmp++;
4631                 break;
4632 #endif /* INET6 */
4633         }
4634
4635         if (!state_icmp) {
4636
4637                 /*
4638                  * ICMP query/reply message not related to a TCP/UDP packet.
4639                  * Search for an ICMP state.
4640                  */
4641                 key.af = pd->af;
4642                 key.proto = pd->proto;
4643                 key.port[0] = key.port[1] = icmpid;
4644                 if (direction == PF_IN) {       /* wire side, straight */
4645                         PF_ACPY(&key.addr[0], pd->src, key.af);
4646                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4647                 } else {                        /* stack side, reverse */
4648                         PF_ACPY(&key.addr[1], pd->src, key.af);
4649                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4650                 }
4651
4652                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4653
4654                 (*state)->expire = time_uptime;
4655                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4656
4657                 /* translate source/destination address, if necessary */
4658                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4659                         struct pf_state_key *nk = (*state)->key[pd->didx];
4660
4661                         switch (pd->af) {
4662 #ifdef INET
4663                         case AF_INET:
4664                                 if (PF_ANEQ(pd->src,
4665                                     &nk->addr[pd->sidx], AF_INET))
4666                                         pf_change_a(&saddr->v4.s_addr,
4667                                             pd->ip_sum,
4668                                             nk->addr[pd->sidx].v4.s_addr, 0);
4669
4670                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4671                                     AF_INET))
4672                                         pf_change_a(&daddr->v4.s_addr,
4673                                             pd->ip_sum,
4674                                             nk->addr[pd->didx].v4.s_addr, 0);
4675
4676                                 if (nk->port[0] !=
4677                                     pd->hdr.icmp->icmp_id) {
4678                                         pd->hdr.icmp->icmp_cksum =
4679                                             pf_cksum_fixup(
4680                                             pd->hdr.icmp->icmp_cksum, icmpid,
4681                                             nk->port[pd->sidx], 0);
4682                                         pd->hdr.icmp->icmp_id =
4683                                             nk->port[pd->sidx];
4684                                 }
4685
4686                                 m_copyback(m, off, ICMP_MINLEN,
4687                                     (caddr_t )pd->hdr.icmp);
4688                                 break;
4689 #endif /* INET */
4690 #ifdef INET6
4691                         case AF_INET6:
4692                                 if (PF_ANEQ(pd->src,
4693                                     &nk->addr[pd->sidx], AF_INET6))
4694                                         pf_change_a6(saddr,
4695                                             &pd->hdr.icmp6->icmp6_cksum,
4696                                             &nk->addr[pd->sidx], 0);
4697
4698                                 if (PF_ANEQ(pd->dst,
4699                                     &nk->addr[pd->didx], AF_INET6))
4700                                         pf_change_a6(daddr,
4701                                             &pd->hdr.icmp6->icmp6_cksum,
4702                                             &nk->addr[pd->didx], 0);
4703
4704                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4705                                     (caddr_t )pd->hdr.icmp6);
4706                                 break;
4707 #endif /* INET6 */
4708                         }
4709                 }
4710                 return (PF_PASS);
4711
4712         } else {
4713                 /*
4714                  * ICMP error message in response to a TCP/UDP packet.
4715                  * Extract the inner TCP/UDP header and search for that state.
4716                  */
4717
4718                 struct pf_pdesc pd2;
4719                 bzero(&pd2, sizeof pd2);
4720 #ifdef INET
4721                 struct ip       h2;
4722 #endif /* INET */
4723 #ifdef INET6
4724                 struct ip6_hdr  h2_6;
4725                 int             terminal = 0;
4726 #endif /* INET6 */
4727                 int             ipoff2 = 0;
4728                 int             off2 = 0;
4729
4730                 pd2.af = pd->af;
4731                 /* Payload packet is from the opposite direction. */
4732                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4733                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4734                 switch (pd->af) {
4735 #ifdef INET
4736                 case AF_INET:
4737                         /* offset of h2 in mbuf chain */
4738                         ipoff2 = off + ICMP_MINLEN;
4739
4740                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4741                             NULL, reason, pd2.af)) {
4742                                 DPFPRINTF(PF_DEBUG_MISC,
4743                                     ("pf: ICMP error message too short "
4744                                     "(ip)\n"));
4745                                 return (PF_DROP);
4746                         }
4747                         /*
4748                          * ICMP error messages don't refer to non-first
4749                          * fragments
4750                          */
4751                         if (h2.ip_off & htons(IP_OFFMASK)) {
4752                                 REASON_SET(reason, PFRES_FRAG);
4753                                 return (PF_DROP);
4754                         }
4755
4756                         /* offset of protocol header that follows h2 */
4757                         off2 = ipoff2 + (h2.ip_hl << 2);
4758
4759                         pd2.proto = h2.ip_p;
4760                         pd2.src = (struct pf_addr *)&h2.ip_src;
4761                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4762                         pd2.ip_sum = &h2.ip_sum;
4763                         break;
4764 #endif /* INET */
4765 #ifdef INET6
4766                 case AF_INET6:
4767                         ipoff2 = off + sizeof(struct icmp6_hdr);
4768
4769                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4770                             NULL, reason, pd2.af)) {
4771                                 DPFPRINTF(PF_DEBUG_MISC,
4772                                     ("pf: ICMP error message too short "
4773                                     "(ip6)\n"));
4774                                 return (PF_DROP);
4775                         }
4776                         pd2.proto = h2_6.ip6_nxt;
4777                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4778                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4779                         pd2.ip_sum = NULL;
4780                         off2 = ipoff2 + sizeof(h2_6);
4781                         do {
4782                                 switch (pd2.proto) {
4783                                 case IPPROTO_FRAGMENT:
4784                                         /*
4785                                          * ICMPv6 error messages for
4786                                          * non-first fragments
4787                                          */
4788                                         REASON_SET(reason, PFRES_FRAG);
4789                                         return (PF_DROP);
4790                                 case IPPROTO_AH:
4791                                 case IPPROTO_HOPOPTS:
4792                                 case IPPROTO_ROUTING:
4793                                 case IPPROTO_DSTOPTS: {
4794                                         /* get next header and header length */
4795                                         struct ip6_ext opt6;
4796
4797                                         if (!pf_pull_hdr(m, off2, &opt6,
4798                                             sizeof(opt6), NULL, reason,
4799                                             pd2.af)) {
4800                                                 DPFPRINTF(PF_DEBUG_MISC,
4801                                                     ("pf: ICMPv6 short opt\n"));
4802                                                 return (PF_DROP);
4803                                         }
4804                                         if (pd2.proto == IPPROTO_AH)
4805                                                 off2 += (opt6.ip6e_len + 2) * 4;
4806                                         else
4807                                                 off2 += (opt6.ip6e_len + 1) * 8;
4808                                         pd2.proto = opt6.ip6e_nxt;
4809                                         /* goto the next header */
4810                                         break;
4811                                 }
4812                                 default:
4813                                         terminal++;
4814                                         break;
4815                                 }
4816                         } while (!terminal);
4817                         break;
4818 #endif /* INET6 */
4819                 }
4820
4821                 if (PF_ANEQ(pd->dst, pd2.src, pd->af)) {
4822                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
4823                                 printf("pf: BAD ICMP %d:%d outer dst: ",
4824                                     icmptype, icmpcode);
4825                                 pf_print_host(pd->src, 0, pd->af);
4826                                 printf(" -> ");
4827                                 pf_print_host(pd->dst, 0, pd->af);
4828                                 printf(" inner src: ");
4829                                 pf_print_host(pd2.src, 0, pd2.af);
4830                                 printf(" -> ");
4831                                 pf_print_host(pd2.dst, 0, pd2.af);
4832                                 printf("\n");
4833                         }
4834                         REASON_SET(reason, PFRES_BADSTATE);
4835                         return (PF_DROP);
4836                 }
4837
4838                 switch (pd2.proto) {
4839                 case IPPROTO_TCP: {
4840                         struct tcphdr            th;
4841                         u_int32_t                seq;
4842                         struct pf_state_peer    *src, *dst;
4843                         u_int8_t                 dws;
4844                         int                      copyback = 0;
4845
4846                         /*
4847                          * Only the first 8 bytes of the TCP header can be
4848                          * expected. Don't access any TCP header fields after
4849                          * th_seq, an ackskew test is not possible.
4850                          */
4851                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4852                             pd2.af)) {
4853                                 DPFPRINTF(PF_DEBUG_MISC,
4854                                     ("pf: ICMP error message too short "
4855                                     "(tcp)\n"));
4856                                 return (PF_DROP);
4857                         }
4858
4859                         key.af = pd2.af;
4860                         key.proto = IPPROTO_TCP;
4861                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4862                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4863                         key.port[pd2.sidx] = th.th_sport;
4864                         key.port[pd2.didx] = th.th_dport;
4865
4866                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4867
4868                         if (direction == (*state)->direction) {
4869                                 src = &(*state)->dst;
4870                                 dst = &(*state)->src;
4871                         } else {
4872                                 src = &(*state)->src;
4873                                 dst = &(*state)->dst;
4874                         }
4875
4876                         if (src->wscale && dst->wscale)
4877                                 dws = dst->wscale & PF_WSCALE_MASK;
4878                         else
4879                                 dws = 0;
4880
4881                         /* Demodulate sequence number */
4882                         seq = ntohl(th.th_seq) - src->seqdiff;
4883                         if (src->seqdiff) {
4884                                 pf_change_a(&th.th_seq, icmpsum,
4885                                     htonl(seq), 0);
4886                                 copyback = 1;
4887                         }
4888
4889                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4890                             (!SEQ_GEQ(src->seqhi, seq) ||
4891                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4892                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4893                                         printf("pf: BAD ICMP %d:%d ",
4894                                             icmptype, icmpcode);
4895                                         pf_print_host(pd->src, 0, pd->af);
4896                                         printf(" -> ");
4897                                         pf_print_host(pd->dst, 0, pd->af);
4898                                         printf(" state: ");
4899                                         pf_print_state(*state);
4900                                         printf(" seq=%u\n", seq);
4901                                 }
4902                                 REASON_SET(reason, PFRES_BADSTATE);
4903                                 return (PF_DROP);
4904                         } else {
4905                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4906                                         printf("pf: OK ICMP %d:%d ",
4907                                             icmptype, icmpcode);
4908                                         pf_print_host(pd->src, 0, pd->af);
4909                                         printf(" -> ");
4910                                         pf_print_host(pd->dst, 0, pd->af);
4911                                         printf(" state: ");
4912                                         pf_print_state(*state);
4913                                         printf(" seq=%u\n", seq);
4914                                 }
4915                         }
4916
4917                         /* translate source/destination address, if necessary */
4918                         if ((*state)->key[PF_SK_WIRE] !=
4919                             (*state)->key[PF_SK_STACK]) {
4920                                 struct pf_state_key *nk =
4921                                     (*state)->key[pd->didx];
4922
4923                                 if (PF_ANEQ(pd2.src,
4924                                     &nk->addr[pd2.sidx], pd2.af) ||
4925                                     nk->port[pd2.sidx] != th.th_sport)
4926                                         pf_change_icmp(pd2.src, &th.th_sport,
4927                                             daddr, &nk->addr[pd2.sidx],
4928                                             nk->port[pd2.sidx], NULL,
4929                                             pd2.ip_sum, icmpsum,
4930                                             pd->ip_sum, 0, pd2.af);
4931
4932                                 if (PF_ANEQ(pd2.dst,
4933                                     &nk->addr[pd2.didx], pd2.af) ||
4934                                     nk->port[pd2.didx] != th.th_dport)
4935                                         pf_change_icmp(pd2.dst, &th.th_dport,
4936                                             saddr, &nk->addr[pd2.didx],
4937                                             nk->port[pd2.didx], NULL,
4938                                             pd2.ip_sum, icmpsum,
4939                                             pd->ip_sum, 0, pd2.af);
4940                                 copyback = 1;
4941                         }
4942
4943                         if (copyback) {
4944                                 switch (pd2.af) {
4945 #ifdef INET
4946                                 case AF_INET:
4947                                         m_copyback(m, off, ICMP_MINLEN,
4948                                             (caddr_t )pd->hdr.icmp);
4949                                         m_copyback(m, ipoff2, sizeof(h2),
4950                                             (caddr_t )&h2);
4951                                         break;
4952 #endif /* INET */
4953 #ifdef INET6
4954                                 case AF_INET6:
4955                                         m_copyback(m, off,
4956                                             sizeof(struct icmp6_hdr),
4957                                             (caddr_t )pd->hdr.icmp6);
4958                                         m_copyback(m, ipoff2, sizeof(h2_6),
4959                                             (caddr_t )&h2_6);
4960                                         break;
4961 #endif /* INET6 */
4962                                 }
4963                                 m_copyback(m, off2, 8, (caddr_t)&th);
4964                         }
4965
4966                         return (PF_PASS);
4967                         break;
4968                 }
4969                 case IPPROTO_UDP: {
4970                         struct udphdr           uh;
4971
4972                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4973                             NULL, reason, pd2.af)) {
4974                                 DPFPRINTF(PF_DEBUG_MISC,
4975                                     ("pf: ICMP error message too short "
4976                                     "(udp)\n"));
4977                                 return (PF_DROP);
4978                         }
4979
4980                         key.af = pd2.af;
4981                         key.proto = IPPROTO_UDP;
4982                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4983                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4984                         key.port[pd2.sidx] = uh.uh_sport;
4985                         key.port[pd2.didx] = uh.uh_dport;
4986
4987                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4988
4989                         /* translate source/destination address, if necessary */
4990                         if ((*state)->key[PF_SK_WIRE] !=
4991                             (*state)->key[PF_SK_STACK]) {
4992                                 struct pf_state_key *nk =
4993                                     (*state)->key[pd->didx];
4994
4995                                 if (PF_ANEQ(pd2.src,
4996                                     &nk->addr[pd2.sidx], pd2.af) ||
4997                                     nk->port[pd2.sidx] != uh.uh_sport)
4998                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4999                                             daddr, &nk->addr[pd2.sidx],
5000                                             nk->port[pd2.sidx], &uh.uh_sum,
5001                                             pd2.ip_sum, icmpsum,
5002                                             pd->ip_sum, 1, pd2.af);
5003
5004                                 if (PF_ANEQ(pd2.dst,
5005                                     &nk->addr[pd2.didx], pd2.af) ||
5006                                     nk->port[pd2.didx] != uh.uh_dport)
5007                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
5008                                             saddr, &nk->addr[pd2.didx],
5009                                             nk->port[pd2.didx], &uh.uh_sum,
5010                                             pd2.ip_sum, icmpsum,
5011                                             pd->ip_sum, 1, pd2.af);
5012
5013                                 switch (pd2.af) {
5014 #ifdef INET
5015                                 case AF_INET:
5016                                         m_copyback(m, off, ICMP_MINLEN,
5017                                             (caddr_t )pd->hdr.icmp);
5018                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5019                                         break;
5020 #endif /* INET */
5021 #ifdef INET6
5022                                 case AF_INET6:
5023                                         m_copyback(m, off,
5024                                             sizeof(struct icmp6_hdr),
5025                                             (caddr_t )pd->hdr.icmp6);
5026                                         m_copyback(m, ipoff2, sizeof(h2_6),
5027                                             (caddr_t )&h2_6);
5028                                         break;
5029 #endif /* INET6 */
5030                                 }
5031                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5032                         }
5033                         return (PF_PASS);
5034                         break;
5035                 }
5036 #ifdef INET
5037                 case IPPROTO_ICMP: {
5038                         struct icmp             iih;
5039
5040                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5041                             NULL, reason, pd2.af)) {
5042                                 DPFPRINTF(PF_DEBUG_MISC,
5043                                     ("pf: ICMP error message too short i"
5044                                     "(icmp)\n"));
5045                                 return (PF_DROP);
5046                         }
5047
5048                         key.af = pd2.af;
5049                         key.proto = IPPROTO_ICMP;
5050                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5051                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5052                         key.port[0] = key.port[1] = iih.icmp_id;
5053
5054                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5055
5056                         /* translate source/destination address, if necessary */
5057                         if ((*state)->key[PF_SK_WIRE] !=
5058                             (*state)->key[PF_SK_STACK]) {
5059                                 struct pf_state_key *nk =
5060                                     (*state)->key[pd->didx];
5061
5062                                 if (PF_ANEQ(pd2.src,
5063                                     &nk->addr[pd2.sidx], pd2.af) ||
5064                                     nk->port[pd2.sidx] != iih.icmp_id)
5065                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5066                                             daddr, &nk->addr[pd2.sidx],
5067                                             nk->port[pd2.sidx], NULL,
5068                                             pd2.ip_sum, icmpsum,
5069                                             pd->ip_sum, 0, AF_INET);
5070
5071                                 if (PF_ANEQ(pd2.dst,
5072                                     &nk->addr[pd2.didx], pd2.af) ||
5073                                     nk->port[pd2.didx] != iih.icmp_id)
5074                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5075                                             saddr, &nk->addr[pd2.didx],
5076                                             nk->port[pd2.didx], NULL,
5077                                             pd2.ip_sum, icmpsum,
5078                                             pd->ip_sum, 0, AF_INET);
5079
5080                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5081                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5082                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5083                         }
5084                         return (PF_PASS);
5085                         break;
5086                 }
5087 #endif /* INET */
5088 #ifdef INET6
5089                 case IPPROTO_ICMPV6: {
5090                         struct icmp6_hdr        iih;
5091
5092                         if (!pf_pull_hdr(m, off2, &iih,
5093                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5094                                 DPFPRINTF(PF_DEBUG_MISC,
5095                                     ("pf: ICMP error message too short "
5096                                     "(icmp6)\n"));
5097                                 return (PF_DROP);
5098                         }
5099
5100                         key.af = pd2.af;
5101                         key.proto = IPPROTO_ICMPV6;
5102                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5103                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5104                         key.port[0] = key.port[1] = iih.icmp6_id;
5105
5106                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5107
5108                         /* translate source/destination address, if necessary */
5109                         if ((*state)->key[PF_SK_WIRE] !=
5110                             (*state)->key[PF_SK_STACK]) {
5111                                 struct pf_state_key *nk =
5112                                     (*state)->key[pd->didx];
5113
5114                                 if (PF_ANEQ(pd2.src,
5115                                     &nk->addr[pd2.sidx], pd2.af) ||
5116                                     nk->port[pd2.sidx] != iih.icmp6_id)
5117                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5118                                             daddr, &nk->addr[pd2.sidx],
5119                                             nk->port[pd2.sidx], NULL,
5120                                             pd2.ip_sum, icmpsum,
5121                                             pd->ip_sum, 0, AF_INET6);
5122
5123                                 if (PF_ANEQ(pd2.dst,
5124                                     &nk->addr[pd2.didx], pd2.af) ||
5125                                     nk->port[pd2.didx] != iih.icmp6_id)
5126                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5127                                             saddr, &nk->addr[pd2.didx],
5128                                             nk->port[pd2.didx], NULL,
5129                                             pd2.ip_sum, icmpsum,
5130                                             pd->ip_sum, 0, AF_INET6);
5131
5132                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5133                                     (caddr_t)pd->hdr.icmp6);
5134                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5135                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5136                                     (caddr_t)&iih);
5137                         }
5138                         return (PF_PASS);
5139                         break;
5140                 }
5141 #endif /* INET6 */
5142                 default: {
5143                         key.af = pd2.af;
5144                         key.proto = pd2.proto;
5145                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5146                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5147                         key.port[0] = key.port[1] = 0;
5148
5149                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5150
5151                         /* translate source/destination address, if necessary */
5152                         if ((*state)->key[PF_SK_WIRE] !=
5153                             (*state)->key[PF_SK_STACK]) {
5154                                 struct pf_state_key *nk =
5155                                     (*state)->key[pd->didx];
5156
5157                                 if (PF_ANEQ(pd2.src,
5158                                     &nk->addr[pd2.sidx], pd2.af))
5159                                         pf_change_icmp(pd2.src, NULL, daddr,
5160                                             &nk->addr[pd2.sidx], 0, NULL,
5161                                             pd2.ip_sum, icmpsum,
5162                                             pd->ip_sum, 0, pd2.af);
5163
5164                                 if (PF_ANEQ(pd2.dst,
5165                                     &nk->addr[pd2.didx], pd2.af))
5166                                         pf_change_icmp(pd2.dst, NULL, saddr,
5167                                             &nk->addr[pd2.didx], 0, NULL,
5168                                             pd2.ip_sum, icmpsum,
5169                                             pd->ip_sum, 0, pd2.af);
5170
5171                                 switch (pd2.af) {
5172 #ifdef INET
5173                                 case AF_INET:
5174                                         m_copyback(m, off, ICMP_MINLEN,
5175                                             (caddr_t)pd->hdr.icmp);
5176                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5177                                         break;
5178 #endif /* INET */
5179 #ifdef INET6
5180                                 case AF_INET6:
5181                                         m_copyback(m, off,
5182                                             sizeof(struct icmp6_hdr),
5183                                             (caddr_t )pd->hdr.icmp6);
5184                                         m_copyback(m, ipoff2, sizeof(h2_6),
5185                                             (caddr_t )&h2_6);
5186                                         break;
5187 #endif /* INET6 */
5188                                 }
5189                         }
5190                         return (PF_PASS);
5191                         break;
5192                 }
5193                 }
5194         }
5195 }
5196
5197 static int
5198 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5199     struct mbuf *m, struct pf_pdesc *pd)
5200 {
5201         struct pf_state_peer    *src, *dst;
5202         struct pf_state_key_cmp  key;
5203
5204         bzero(&key, sizeof(key));
5205         key.af = pd->af;
5206         key.proto = pd->proto;
5207         if (direction == PF_IN) {
5208                 PF_ACPY(&key.addr[0], pd->src, key.af);
5209                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5210                 key.port[0] = key.port[1] = 0;
5211         } else {
5212                 PF_ACPY(&key.addr[1], pd->src, key.af);
5213                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5214                 key.port[1] = key.port[0] = 0;
5215         }
5216
5217         STATE_LOOKUP(kif, &key, direction, *state, pd);
5218
5219         if (direction == (*state)->direction) {
5220                 src = &(*state)->src;
5221                 dst = &(*state)->dst;
5222         } else {
5223                 src = &(*state)->dst;
5224                 dst = &(*state)->src;
5225         }
5226
5227         /* update states */
5228         if (src->state < PFOTHERS_SINGLE)
5229                 src->state = PFOTHERS_SINGLE;
5230         if (dst->state == PFOTHERS_SINGLE)
5231                 dst->state = PFOTHERS_MULTIPLE;
5232
5233         /* update expire time */
5234         (*state)->expire = time_uptime;
5235         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5236                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5237         else
5238                 (*state)->timeout = PFTM_OTHER_SINGLE;
5239
5240         /* translate source/destination address, if necessary */
5241         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5242                 struct pf_state_key *nk = (*state)->key[pd->didx];
5243
5244                 KASSERT(nk, ("%s: nk is null", __func__));
5245                 KASSERT(pd, ("%s: pd is null", __func__));
5246                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
5247                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5248                 switch (pd->af) {
5249 #ifdef INET
5250                 case AF_INET:
5251                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5252                                 pf_change_a(&pd->src->v4.s_addr,
5253                                     pd->ip_sum,
5254                                     nk->addr[pd->sidx].v4.s_addr,
5255                                     0);
5256
5257
5258                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5259                                 pf_change_a(&pd->dst->v4.s_addr,
5260                                     pd->ip_sum,
5261                                     nk->addr[pd->didx].v4.s_addr,
5262                                     0);
5263
5264                         break;
5265 #endif /* INET */
5266 #ifdef INET6
5267                 case AF_INET6:
5268                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5269                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5270
5271                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5272                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5273 #endif /* INET6 */
5274                 }
5275         }
5276         return (PF_PASS);
5277 }
5278
5279 /*
5280  * ipoff and off are measured from the start of the mbuf chain.
5281  * h must be at "ipoff" on the mbuf chain.
5282  */
5283 void *
5284 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5285     u_short *actionp, u_short *reasonp, sa_family_t af)
5286 {
5287         switch (af) {
5288 #ifdef INET
5289         case AF_INET: {
5290                 struct ip       *h = mtod(m, struct ip *);
5291                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5292
5293                 if (fragoff) {
5294                         if (fragoff >= len)
5295                                 ACTION_SET(actionp, PF_PASS);
5296                         else {
5297                                 ACTION_SET(actionp, PF_DROP);
5298                                 REASON_SET(reasonp, PFRES_FRAG);
5299                         }
5300                         return (NULL);
5301                 }
5302                 if (m->m_pkthdr.len < off + len ||
5303                     ntohs(h->ip_len) < off + len) {
5304                         ACTION_SET(actionp, PF_DROP);
5305                         REASON_SET(reasonp, PFRES_SHORT);
5306                         return (NULL);
5307                 }
5308                 break;
5309         }
5310 #endif /* INET */
5311 #ifdef INET6
5312         case AF_INET6: {
5313                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5314
5315                 if (m->m_pkthdr.len < off + len ||
5316                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5317                     (unsigned)(off + len)) {
5318                         ACTION_SET(actionp, PF_DROP);
5319                         REASON_SET(reasonp, PFRES_SHORT);
5320                         return (NULL);
5321                 }
5322                 break;
5323         }
5324 #endif /* INET6 */
5325         }
5326         m_copydata(m, off, len, p);
5327         return (p);
5328 }
5329
5330 #ifdef RADIX_MPATH
5331 static int
5332 pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5333     int rtableid)
5334 {
5335         struct radix_node_head  *rnh;
5336         struct sockaddr_in      *dst;
5337         int                      ret = 1;
5338         int                      check_mpath;
5339 #ifdef INET6
5340         struct sockaddr_in6     *dst6;
5341         struct route_in6         ro;
5342 #else
5343         struct route             ro;
5344 #endif
5345         struct radix_node       *rn;
5346         struct rtentry          *rt;
5347         struct ifnet            *ifp;
5348
5349         check_mpath = 0;
5350         /* XXX: stick to table 0 for now */
5351         rnh = rt_tables_get_rnh(0, af);
5352         if (rnh != NULL && rn_mpath_capable(rnh))
5353                 check_mpath = 1;
5354         bzero(&ro, sizeof(ro));
5355         switch (af) {
5356         case AF_INET:
5357                 dst = satosin(&ro.ro_dst);
5358                 dst->sin_family = AF_INET;
5359                 dst->sin_len = sizeof(*dst);
5360                 dst->sin_addr = addr->v4;
5361                 break;
5362 #ifdef INET6
5363         case AF_INET6:
5364                 /*
5365                  * Skip check for addresses with embedded interface scope,
5366                  * as they would always match anyway.
5367                  */
5368                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5369                         goto out;
5370                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5371                 dst6->sin6_family = AF_INET6;
5372                 dst6->sin6_len = sizeof(*dst6);
5373                 dst6->sin6_addr = addr->v6;
5374                 break;
5375 #endif /* INET6 */
5376         default:
5377                 return (0);
5378         }
5379
5380         /* Skip checks for ipsec interfaces */
5381         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5382                 goto out;
5383
5384         switch (af) {
5385 #ifdef INET6
5386         case AF_INET6:
5387                 in6_rtalloc_ign(&ro, 0, rtableid);
5388                 break;
5389 #endif
5390 #ifdef INET
5391         case AF_INET:
5392                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5393                 break;
5394 #endif
5395         }
5396
5397         if (ro.ro_rt != NULL) {
5398                 /* No interface given, this is a no-route check */
5399                 if (kif == NULL)
5400                         goto out;
5401
5402                 if (kif->pfik_ifp == NULL) {
5403                         ret = 0;
5404                         goto out;
5405                 }
5406
5407                 /* Perform uRPF check if passed input interface */
5408                 ret = 0;
5409                 rn = (struct radix_node *)ro.ro_rt;
5410                 do {
5411                         rt = (struct rtentry *)rn;
5412                         ifp = rt->rt_ifp;
5413
5414                         if (kif->pfik_ifp == ifp)
5415                                 ret = 1;
5416                         rn = rn_mpath_next(rn);
5417                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5418         } else
5419                 ret = 0;
5420 out:
5421         if (ro.ro_rt != NULL)
5422                 RTFREE(ro.ro_rt);
5423         return (ret);
5424 }
5425 #endif
5426
5427 int
5428 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5429     int rtableid)
5430 {
5431 #ifdef INET
5432         struct nhop4_basic      nh4;
5433 #endif
5434 #ifdef INET6
5435         struct nhop6_basic      nh6;
5436 #endif
5437         struct ifnet            *ifp;
5438 #ifdef RADIX_MPATH
5439         struct radix_node_head  *rnh;
5440
5441         /* XXX: stick to table 0 for now */
5442         rnh = rt_tables_get_rnh(0, af);
5443         if (rnh != NULL && rn_mpath_capable(rnh))
5444                 return (pf_routable_oldmpath(addr, af, kif, rtableid));
5445 #endif
5446         /*
5447          * Skip check for addresses with embedded interface scope,
5448          * as they would always match anyway.
5449          */
5450         if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
5451                 return (1);
5452
5453         if (af != AF_INET && af != AF_INET6)
5454                 return (0);
5455
5456         /* Skip checks for ipsec interfaces */
5457         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5458                 return (1);
5459
5460         ifp = NULL;
5461
5462         switch (af) {
5463 #ifdef INET6
5464         case AF_INET6:
5465                 if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
5466                         return (0);
5467                 ifp = nh6.nh_ifp;
5468                 break;
5469 #endif
5470 #ifdef INET
5471         case AF_INET:
5472                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
5473                         return (0);
5474                 ifp = nh4.nh_ifp;
5475                 break;
5476 #endif
5477         }
5478
5479         /* No interface given, this is a no-route check */
5480         if (kif == NULL)
5481                 return (1);
5482
5483         if (kif->pfik_ifp == NULL)
5484                 return (0);
5485
5486         /* Perform uRPF check if passed input interface */
5487         if (kif->pfik_ifp == ifp)
5488                 return (1);
5489         return (0);
5490 }
5491
5492 #ifdef INET
5493 static void
5494 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5495     struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp)
5496 {
5497         struct mbuf             *m0, *m1;
5498         struct sockaddr_in      dst;
5499         struct ip               *ip;
5500         struct ifnet            *ifp = NULL;
5501         struct pf_addr           naddr;
5502         struct pf_src_node      *sn = NULL;
5503         int                      error = 0;
5504         uint16_t                 ip_len, ip_off;
5505
5506         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5507         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5508             __func__));
5509
5510         if ((pd->pf_mtag == NULL &&
5511             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5512             pd->pf_mtag->routed++ > 3) {
5513                 m0 = *m;
5514                 *m = NULL;
5515                 goto bad_locked;
5516         }
5517
5518         if (r->rt == PF_DUPTO) {
5519                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5520                         if (s)
5521                                 PF_STATE_UNLOCK(s);
5522                         return;
5523                 }
5524         } else {
5525                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5526                         if (s)
5527                                 PF_STATE_UNLOCK(s);
5528                         return;
5529                 }
5530                 m0 = *m;
5531         }
5532
5533         ip = mtod(m0, struct ip *);
5534
5535         bzero(&dst, sizeof(dst));
5536         dst.sin_family = AF_INET;
5537         dst.sin_len = sizeof(dst);
5538         dst.sin_addr = ip->ip_dst;
5539
5540         bzero(&naddr, sizeof(naddr));
5541
5542         if (TAILQ_EMPTY(&r->rpool.list)) {
5543                 DPFPRINTF(PF_DEBUG_URGENT,
5544                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5545                 goto bad_locked;
5546         }
5547         if (s == NULL) {
5548                 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5549                     &naddr, NULL, &sn);
5550                 if (!PF_AZERO(&naddr, AF_INET))
5551                         dst.sin_addr.s_addr = naddr.v4.s_addr;
5552                 ifp = r->rpool.cur->kif ?
5553                     r->rpool.cur->kif->pfik_ifp : NULL;
5554         } else {
5555                 if (!PF_AZERO(&s->rt_addr, AF_INET))
5556                         dst.sin_addr.s_addr =
5557                             s->rt_addr.v4.s_addr;
5558                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5559                 PF_STATE_UNLOCK(s);
5560         }
5561         if (ifp == NULL)
5562                 goto bad;
5563
5564         if (oifp != ifp) {
5565                 if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS)
5566                         goto bad;
5567                 else if (m0 == NULL)
5568                         goto done;
5569                 if (m0->m_len < sizeof(struct ip)) {
5570                         DPFPRINTF(PF_DEBUG_URGENT,
5571                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5572                         goto bad;
5573                 }
5574                 ip = mtod(m0, struct ip *);
5575         }
5576
5577         if (ifp->if_flags & IFF_LOOPBACK)
5578                 m0->m_flags |= M_SKIP_FIREWALL;
5579
5580         ip_len = ntohs(ip->ip_len);
5581         ip_off = ntohs(ip->ip_off);
5582
5583         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5584         m0->m_pkthdr.csum_flags |= CSUM_IP;
5585         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5586                 in_delayed_cksum(m0);
5587                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5588         }
5589 #ifdef SCTP
5590         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5591                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5592                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5593         }
5594 #endif
5595
5596         /*
5597          * If small enough for interface, or the interface will take
5598          * care of the fragmentation for us, we can just send directly.
5599          */
5600         if (ip_len <= ifp->if_mtu ||
5601             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
5602                 ip->ip_sum = 0;
5603                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5604                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5605                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5606                 }
5607                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5608                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5609                 goto done;
5610         }
5611
5612         /* Balk when DF bit is set or the interface didn't support TSO. */
5613         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5614                 error = EMSGSIZE;
5615                 KMOD_IPSTAT_INC(ips_cantfrag);
5616                 if (r->rt != PF_DUPTO) {
5617                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5618                             ifp->if_mtu);
5619                         goto done;
5620                 } else
5621                         goto bad;
5622         }
5623
5624         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5625         if (error)
5626                 goto bad;
5627
5628         for (; m0; m0 = m1) {
5629                 m1 = m0->m_nextpkt;
5630                 m0->m_nextpkt = NULL;
5631                 if (error == 0) {
5632                         m_clrprotoflags(m0);
5633                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5634                 } else
5635                         m_freem(m0);
5636         }
5637
5638         if (error == 0)
5639                 KMOD_IPSTAT_INC(ips_fragmented);
5640
5641 done:
5642         if (r->rt != PF_DUPTO)
5643                 *m = NULL;
5644         return;
5645
5646 bad_locked:
5647         if (s)
5648                 PF_STATE_UNLOCK(s);
5649 bad:
5650         m_freem(m0);
5651         goto done;
5652 }
5653 #endif /* INET */
5654
5655 #ifdef INET6
5656 static void
5657 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5658     struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp)
5659 {
5660         struct mbuf             *m0;
5661         struct sockaddr_in6     dst;
5662         struct ip6_hdr          *ip6;
5663         struct ifnet            *ifp = NULL;
5664         struct pf_addr           naddr;
5665         struct pf_src_node      *sn = NULL;
5666
5667         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5668         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5669             __func__));
5670
5671         if ((pd->pf_mtag == NULL &&
5672             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5673             pd->pf_mtag->routed++ > 3) {
5674                 m0 = *m;
5675                 *m = NULL;
5676                 goto bad_locked;
5677         }
5678
5679         if (r->rt == PF_DUPTO) {
5680                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5681                         if (s)
5682                                 PF_STATE_UNLOCK(s);
5683                         return;
5684                 }
5685         } else {
5686                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5687                         if (s)
5688                                 PF_STATE_UNLOCK(s);
5689                         return;
5690                 }
5691                 m0 = *m;
5692         }
5693
5694         ip6 = mtod(m0, struct ip6_hdr *);
5695
5696         bzero(&dst, sizeof(dst));
5697         dst.sin6_family = AF_INET6;
5698         dst.sin6_len = sizeof(dst);
5699         dst.sin6_addr = ip6->ip6_dst;
5700
5701         bzero(&naddr, sizeof(naddr));
5702
5703         if (TAILQ_EMPTY(&r->rpool.list)) {
5704                 DPFPRINTF(PF_DEBUG_URGENT,
5705                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5706                 goto bad_locked;
5707         }
5708         if (s == NULL) {
5709                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5710                     &naddr, NULL, &sn);
5711                 if (!PF_AZERO(&naddr, AF_INET6))
5712                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5713                             &naddr, AF_INET6);
5714                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5715         } else {
5716                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5717                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5718                             &s->rt_addr, AF_INET6);
5719                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5720         }
5721
5722         if (s)
5723                 PF_STATE_UNLOCK(s);
5724
5725         if (ifp == NULL)
5726                 goto bad;
5727
5728         if (oifp != ifp) {
5729                 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp) != PF_PASS)
5730                         goto bad;
5731                 else if (m0 == NULL)
5732                         goto done;
5733                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5734                         DPFPRINTF(PF_DEBUG_URGENT,
5735                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5736                             __func__));
5737                         goto bad;
5738                 }
5739                 ip6 = mtod(m0, struct ip6_hdr *);
5740         }
5741
5742         if (ifp->if_flags & IFF_LOOPBACK)
5743                 m0->m_flags |= M_SKIP_FIREWALL;
5744
5745         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5746             ~ifp->if_hwassist) {
5747                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5748                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5749                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5750         }
5751
5752         /*
5753          * If the packet is too large for the outgoing interface,
5754          * send back an icmp6 error.
5755          */
5756         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5757                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5758         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5759                 nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
5760         else {
5761                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5762                 if (r->rt != PF_DUPTO)
5763                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5764                 else
5765                         goto bad;
5766         }
5767
5768 done:
5769         if (r->rt != PF_DUPTO)
5770                 *m = NULL;
5771         return;
5772
5773 bad_locked:
5774         if (s)
5775                 PF_STATE_UNLOCK(s);
5776 bad:
5777         m_freem(m0);
5778         goto done;
5779 }
5780 #endif /* INET6 */
5781
5782 /*
5783  * FreeBSD supports cksum offloads for the following drivers.
5784  *  em(4), fxp(4), lge(4), ndis(4), nge(4), re(4), ti(4), txp(4), xl(4)
5785  *
5786  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5787  *  network driver performed cksum including pseudo header, need to verify
5788  *   csum_data
5789  * CSUM_DATA_VALID :
5790  *  network driver performed cksum, needs to additional pseudo header
5791  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5792  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5793  *
5794  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5795  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5796  * TCP/UDP layer.
5797  * Also, set csum_data to 0xffff to force cksum validation.
5798  */
5799 static int
5800 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5801 {
5802         u_int16_t sum = 0;
5803         int hw_assist = 0;
5804         struct ip *ip;
5805
5806         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5807                 return (1);
5808         if (m->m_pkthdr.len < off + len)
5809                 return (1);
5810
5811         switch (p) {
5812         case IPPROTO_TCP:
5813                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5814                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5815                                 sum = m->m_pkthdr.csum_data;
5816                         } else {
5817                                 ip = mtod(m, struct ip *);
5818                                 sum = in_pseudo(ip->ip_src.s_addr,
5819                                 ip->ip_dst.s_addr, htonl((u_short)len +
5820                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5821                         }
5822                         sum ^= 0xffff;
5823                         ++hw_assist;
5824                 }
5825                 break;
5826         case IPPROTO_UDP:
5827                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5828                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5829                                 sum = m->m_pkthdr.csum_data;
5830                         } else {
5831                                 ip = mtod(m, struct ip *);
5832                                 sum = in_pseudo(ip->ip_src.s_addr,
5833                                 ip->ip_dst.s_addr, htonl((u_short)len +
5834                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5835                         }
5836                         sum ^= 0xffff;
5837                         ++hw_assist;
5838                 }
5839                 break;
5840         case IPPROTO_ICMP:
5841 #ifdef INET6
5842         case IPPROTO_ICMPV6:
5843 #endif /* INET6 */
5844                 break;
5845         default:
5846                 return (1);
5847         }
5848
5849         if (!hw_assist) {
5850                 switch (af) {
5851                 case AF_INET:
5852                         if (p == IPPROTO_ICMP) {
5853                                 if (m->m_len < off)
5854                                         return (1);
5855                                 m->m_data += off;
5856                                 m->m_len -= off;
5857                                 sum = in_cksum(m, len);
5858                                 m->m_data -= off;
5859                                 m->m_len += off;
5860                         } else {
5861                                 if (m->m_len < sizeof(struct ip))
5862                                         return (1);
5863                                 sum = in4_cksum(m, p, off, len);
5864                         }
5865                         break;
5866 #ifdef INET6
5867                 case AF_INET6:
5868                         if (m->m_len < sizeof(struct ip6_hdr))
5869                                 return (1);
5870                         sum = in6_cksum(m, p, off, len);
5871                         break;
5872 #endif /* INET6 */
5873                 default:
5874                         return (1);
5875                 }
5876         }
5877         if (sum) {
5878                 switch (p) {
5879                 case IPPROTO_TCP:
5880                     {
5881                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5882                         break;
5883                     }
5884                 case IPPROTO_UDP:
5885                     {
5886                         KMOD_UDPSTAT_INC(udps_badsum);
5887                         break;
5888                     }
5889 #ifdef INET
5890                 case IPPROTO_ICMP:
5891                     {
5892                         KMOD_ICMPSTAT_INC(icps_checksum);
5893                         break;
5894                     }
5895 #endif
5896 #ifdef INET6
5897                 case IPPROTO_ICMPV6:
5898                     {
5899                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5900                         break;
5901                     }
5902 #endif /* INET6 */
5903                 }
5904                 return (1);
5905         } else {
5906                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5907                         m->m_pkthdr.csum_flags |=
5908                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5909                         m->m_pkthdr.csum_data = 0xffff;
5910                 }
5911         }
5912         return (0);
5913 }
5914
5915
5916 #ifdef INET
5917 int
5918 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5919 {
5920         struct pfi_kif          *kif;
5921         u_short                  action, reason = 0, log = 0;
5922         struct mbuf             *m = *m0;
5923         struct ip               *h = NULL;
5924         struct m_tag            *ipfwtag;
5925         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5926         struct pf_state         *s = NULL;
5927         struct pf_ruleset       *ruleset = NULL;
5928         struct pf_pdesc          pd;
5929         int                      off, dirndx, pqid = 0;
5930
5931         PF_RULES_RLOCK_TRACKER;
5932
5933         M_ASSERTPKTHDR(m);
5934
5935         if (!V_pf_status.running)
5936                 return (PF_PASS);
5937
5938         memset(&pd, 0, sizeof(pd));
5939
5940         kif = (struct pfi_kif *)ifp->if_pf_kif;
5941
5942         if (kif == NULL) {
5943                 DPFPRINTF(PF_DEBUG_URGENT,
5944                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5945                 return (PF_DROP);
5946         }
5947         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5948                 return (PF_PASS);
5949
5950         if (m->m_flags & M_SKIP_FIREWALL)
5951                 return (PF_PASS);
5952
5953         pd.pf_mtag = pf_find_mtag(m);
5954
5955         PF_RULES_RLOCK();
5956
5957         if (ip_divert_ptr != NULL &&
5958             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5959                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5960                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5961                         if (pd.pf_mtag == NULL &&
5962                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5963                                 action = PF_DROP;
5964                                 goto done;
5965                         }
5966                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5967                         m_tag_delete(m, ipfwtag);
5968                 }
5969                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5970                         m->m_flags |= M_FASTFWD_OURS;
5971                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5972                 }
5973         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5974                 /* We do IP header normalization and packet reassembly here */
5975                 action = PF_DROP;
5976                 goto done;
5977         }
5978         m = *m0;        /* pf_normalize messes with m0 */
5979         h = mtod(m, struct ip *);
5980
5981         off = h->ip_hl << 2;
5982         if (off < (int)sizeof(struct ip)) {
5983                 action = PF_DROP;
5984                 REASON_SET(&reason, PFRES_SHORT);
5985                 log = 1;
5986                 goto done;
5987         }
5988
5989         pd.src = (struct pf_addr *)&h->ip_src;
5990         pd.dst = (struct pf_addr *)&h->ip_dst;
5991         pd.sport = pd.dport = NULL;
5992         pd.ip_sum = &h->ip_sum;
5993         pd.proto_sum = NULL;
5994         pd.proto = h->ip_p;
5995         pd.dir = dir;
5996         pd.sidx = (dir == PF_IN) ? 0 : 1;
5997         pd.didx = (dir == PF_IN) ? 1 : 0;
5998         pd.af = AF_INET;
5999         pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
6000         pd.tot_len = ntohs(h->ip_len);
6001
6002         /* handle fragments that didn't get reassembled by normalization */
6003         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
6004                 action = pf_test_fragment(&r, dir, kif, m, h,
6005                     &pd, &a, &ruleset);
6006                 goto done;
6007         }
6008
6009         switch (h->ip_p) {
6010
6011         case IPPROTO_TCP: {
6012                 struct tcphdr   th;
6013
6014                 pd.hdr.tcp = &th;
6015                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6016                     &action, &reason, AF_INET)) {
6017                         log = action != PF_PASS;
6018                         goto done;
6019                 }
6020                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6021                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
6022                         pqid = 1;
6023                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6024                 if (action == PF_DROP)
6025                         goto done;
6026                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6027                     &reason);
6028                 if (action == PF_PASS) {
6029                         if (V_pfsync_update_state_ptr != NULL)
6030                                 V_pfsync_update_state_ptr(s);
6031                         r = s->rule.ptr;
6032                         a = s->anchor.ptr;
6033                         log = s->log;
6034                 } else if (s == NULL)
6035                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6036                             &a, &ruleset, inp);
6037                 break;
6038         }
6039
6040         case IPPROTO_UDP: {
6041                 struct udphdr   uh;
6042
6043                 pd.hdr.udp = &uh;
6044                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6045                     &action, &reason, AF_INET)) {
6046                         log = action != PF_PASS;
6047                         goto done;
6048                 }
6049                 if (uh.uh_dport == 0 ||
6050                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6051                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6052                         action = PF_DROP;
6053                         REASON_SET(&reason, PFRES_SHORT);
6054                         goto done;
6055                 }
6056                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6057                 if (action == PF_PASS) {
6058                         if (V_pfsync_update_state_ptr != NULL)
6059                                 V_pfsync_update_state_ptr(s);
6060                         r = s->rule.ptr;
6061                         a = s->anchor.ptr;
6062                         log = s->log;
6063                 } else if (s == NULL)
6064                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6065                             &a, &ruleset, inp);
6066                 break;
6067         }
6068
6069         case IPPROTO_ICMP: {
6070                 struct icmp     ih;
6071
6072                 pd.hdr.icmp = &ih;
6073                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6074                     &action, &reason, AF_INET)) {
6075                         log = action != PF_PASS;
6076                         goto done;
6077                 }
6078                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6079                     &reason);
6080                 if (action == PF_PASS) {
6081                         if (V_pfsync_update_state_ptr != NULL)
6082                                 V_pfsync_update_state_ptr(s);
6083                         r = s->rule.ptr;
6084                         a = s->anchor.ptr;
6085                         log = s->log;
6086                 } else if (s == NULL)
6087                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6088                             &a, &ruleset, inp);
6089                 break;
6090         }
6091
6092 #ifdef INET6
6093         case IPPROTO_ICMPV6: {
6094                 action = PF_DROP;
6095                 DPFPRINTF(PF_DEBUG_MISC,
6096                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6097                 goto done;
6098         }
6099 #endif
6100
6101         default:
6102                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6103                 if (action == PF_PASS) {
6104                         if (V_pfsync_update_state_ptr != NULL)
6105                                 V_pfsync_update_state_ptr(s);
6106                         r = s->rule.ptr;
6107                         a = s->anchor.ptr;
6108                         log = s->log;
6109                 } else if (s == NULL)
6110                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6111                             &a, &ruleset, inp);
6112                 break;
6113         }
6114
6115 done:
6116         PF_RULES_RUNLOCK();
6117         if (action == PF_PASS && h->ip_hl > 5 &&
6118             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6119                 action = PF_DROP;
6120                 REASON_SET(&reason, PFRES_IPOPTIONS);
6121                 log = r->log;
6122                 DPFPRINTF(PF_DEBUG_MISC,
6123                     ("pf: dropping packet with ip options\n"));
6124         }
6125
6126         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6127                 action = PF_DROP;
6128                 REASON_SET(&reason, PFRES_MEMORY);
6129         }
6130         if (r->rtableid >= 0)
6131                 M_SETFIB(m, r->rtableid);
6132
6133         if (r->scrub_flags & PFSTATE_SETPRIO) {
6134                 if (pd.tos & IPTOS_LOWDELAY)
6135                         pqid = 1;
6136                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6137                         action = PF_DROP;
6138                         REASON_SET(&reason, PFRES_MEMORY);
6139                         log = 1;
6140                         DPFPRINTF(PF_DEBUG_MISC,
6141                             ("pf: failed to allocate 802.1q mtag\n"));
6142                 }
6143         }
6144
6145 #ifdef ALTQ
6146         if (action == PF_PASS && r->qid) {
6147                 if (pd.pf_mtag == NULL &&
6148                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6149                         action = PF_DROP;
6150                         REASON_SET(&reason, PFRES_MEMORY);
6151                 } else {
6152                         if (s != NULL)
6153                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6154                         if (pqid || (pd.tos & IPTOS_LOWDELAY))
6155                                 pd.pf_mtag->qid = r->pqid;
6156                         else
6157                                 pd.pf_mtag->qid = r->qid;
6158                         /* Add hints for ecn. */
6159                         pd.pf_mtag->hdr = h;
6160                 }
6161
6162         }
6163 #endif /* ALTQ */
6164
6165         /*
6166          * connections redirected to loopback should not match sockets
6167          * bound specifically to loopback due to security implications,
6168          * see tcp_input() and in_pcblookup_listen().
6169          */
6170         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6171             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6172             (s->nat_rule.ptr->action == PF_RDR ||
6173             s->nat_rule.ptr->action == PF_BINAT) &&
6174             IN_LOOPBACK(ntohl(pd.dst->v4.s_addr)))
6175                 m->m_flags |= M_SKIP_FIREWALL;
6176
6177         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
6178             !PACKET_LOOPED(&pd)) {
6179
6180                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
6181                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
6182                 if (ipfwtag != NULL) {
6183                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
6184                             ntohs(r->divert.port);
6185                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
6186
6187                         if (s)
6188                                 PF_STATE_UNLOCK(s);
6189
6190                         m_tag_prepend(m, ipfwtag);
6191                         if (m->m_flags & M_FASTFWD_OURS) {
6192                                 if (pd.pf_mtag == NULL &&
6193                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6194                                         action = PF_DROP;
6195                                         REASON_SET(&reason, PFRES_MEMORY);
6196                                         log = 1;
6197                                         DPFPRINTF(PF_DEBUG_MISC,
6198                                             ("pf: failed to allocate tag\n"));
6199                                 } else {
6200                                         pd.pf_mtag->flags |=
6201                                             PF_FASTFWD_OURS_PRESENT;
6202                                         m->m_flags &= ~M_FASTFWD_OURS;
6203                                 }
6204                         }
6205                         ip_divert_ptr(*m0, dir == PF_IN);
6206                         *m0 = NULL;
6207
6208                         return (action);
6209                 } else {
6210                         /* XXX: ipfw has the same behaviour! */
6211                         action = PF_DROP;
6212                         REASON_SET(&reason, PFRES_MEMORY);
6213                         log = 1;
6214                         DPFPRINTF(PF_DEBUG_MISC,
6215                             ("pf: failed to allocate divert tag\n"));
6216                 }
6217         }
6218
6219         if (log) {
6220                 struct pf_rule *lr;
6221
6222                 if (s != NULL && s->nat_rule.ptr != NULL &&
6223                     s->nat_rule.ptr->log & PF_LOG_ALL)
6224                         lr = s->nat_rule.ptr;
6225                 else
6226                         lr = r;
6227                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6228                     (s == NULL));
6229         }
6230
6231         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6232         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6233
6234         if (action == PF_PASS || r->action == PF_DROP) {
6235                 dirndx = (dir == PF_OUT);
6236                 r->packets[dirndx]++;
6237                 r->bytes[dirndx] += pd.tot_len;
6238                 if (a != NULL) {
6239                         a->packets[dirndx]++;
6240                         a->bytes[dirndx] += pd.tot_len;
6241                 }
6242                 if (s != NULL) {
6243                         if (s->nat_rule.ptr != NULL) {
6244                                 s->nat_rule.ptr->packets[dirndx]++;
6245                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6246                         }
6247                         if (s->src_node != NULL) {
6248                                 s->src_node->packets[dirndx]++;
6249                                 s->src_node->bytes[dirndx] += pd.tot_len;
6250                         }
6251                         if (s->nat_src_node != NULL) {
6252                                 s->nat_src_node->packets[dirndx]++;
6253                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6254                         }
6255                         dirndx = (dir == s->direction) ? 0 : 1;
6256                         s->packets[dirndx]++;
6257                         s->bytes[dirndx] += pd.tot_len;
6258                 }
6259                 tr = r;
6260                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6261                 if (nr != NULL && r == &V_pf_default_rule)
6262                         tr = nr;
6263                 if (tr->src.addr.type == PF_ADDR_TABLE)
6264                         pfr_update_stats(tr->src.addr.p.tbl,
6265                             (s == NULL) ? pd.src :
6266                             &s->key[(s->direction == PF_IN)]->
6267                                 addr[(s->direction == PF_OUT)],
6268                             pd.af, pd.tot_len, dir == PF_OUT,
6269                             r->action == PF_PASS, tr->src.neg);
6270                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6271                         pfr_update_stats(tr->dst.addr.p.tbl,
6272                             (s == NULL) ? pd.dst :
6273                             &s->key[(s->direction == PF_IN)]->
6274                                 addr[(s->direction == PF_IN)],
6275                             pd.af, pd.tot_len, dir == PF_OUT,
6276                             r->action == PF_PASS, tr->dst.neg);
6277         }
6278
6279         switch (action) {
6280         case PF_SYNPROXY_DROP:
6281                 m_freem(*m0);
6282         case PF_DEFER:
6283                 *m0 = NULL;
6284                 action = PF_PASS;
6285                 break;
6286         case PF_DROP:
6287                 m_freem(*m0);
6288                 *m0 = NULL;
6289                 break;
6290         default:
6291                 /* pf_route() returns unlocked. */
6292                 if (r->rt) {
6293                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
6294                         return (action);
6295                 }
6296                 break;
6297         }
6298         if (s)
6299                 PF_STATE_UNLOCK(s);
6300
6301         return (action);
6302 }
6303 #endif /* INET */
6304
6305 #ifdef INET6
6306 int
6307 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6308 {
6309         struct pfi_kif          *kif;
6310         u_short                  action, reason = 0, log = 0;
6311         struct mbuf             *m = *m0, *n = NULL;
6312         struct m_tag            *mtag;
6313         struct ip6_hdr          *h = NULL;
6314         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6315         struct pf_state         *s = NULL;
6316         struct pf_ruleset       *ruleset = NULL;
6317         struct pf_pdesc          pd;
6318         int                      off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
6319
6320         PF_RULES_RLOCK_TRACKER;
6321         M_ASSERTPKTHDR(m);
6322
6323         if (!V_pf_status.running)
6324                 return (PF_PASS);
6325
6326         memset(&pd, 0, sizeof(pd));
6327         pd.pf_mtag = pf_find_mtag(m);
6328
6329         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6330                 return (PF_PASS);
6331
6332         kif = (struct pfi_kif *)ifp->if_pf_kif;
6333         if (kif == NULL) {
6334                 DPFPRINTF(PF_DEBUG_URGENT,
6335                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6336                 return (PF_DROP);
6337         }
6338         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6339                 return (PF_PASS);
6340
6341         if (m->m_flags & M_SKIP_FIREWALL)
6342                 return (PF_PASS);
6343
6344         PF_RULES_RLOCK();
6345
6346         /* We do IP header normalization and packet reassembly here */
6347         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6348                 action = PF_DROP;
6349                 goto done;
6350         }
6351         m = *m0;        /* pf_normalize messes with m0 */
6352         h = mtod(m, struct ip6_hdr *);
6353
6354         /*
6355          * we do not support jumbogram.  if we keep going, zero ip6_plen
6356          * will do something bad, so drop the packet for now.
6357          */
6358         if (htons(h->ip6_plen) == 0) {
6359                 action = PF_DROP;
6360                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6361                 goto done;
6362         }
6363
6364         pd.src = (struct pf_addr *)&h->ip6_src;
6365         pd.dst = (struct pf_addr *)&h->ip6_dst;
6366         pd.sport = pd.dport = NULL;
6367         pd.ip_sum = NULL;
6368         pd.proto_sum = NULL;
6369         pd.dir = dir;
6370         pd.sidx = (dir == PF_IN) ? 0 : 1;
6371         pd.didx = (dir == PF_IN) ? 1 : 0;
6372         pd.af = AF_INET6;
6373         pd.tos = 0;
6374         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6375
6376         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6377         pd.proto = h->ip6_nxt;
6378         do {
6379                 switch (pd.proto) {
6380                 case IPPROTO_FRAGMENT:
6381                         action = pf_test_fragment(&r, dir, kif, m, h,
6382                             &pd, &a, &ruleset);
6383                         if (action == PF_DROP)
6384                                 REASON_SET(&reason, PFRES_FRAG);
6385                         goto done;
6386                 case IPPROTO_ROUTING: {
6387                         struct ip6_rthdr rthdr;
6388
6389                         if (rh_cnt++) {
6390                                 DPFPRINTF(PF_DEBUG_MISC,
6391                                     ("pf: IPv6 more than one rthdr\n"));
6392                                 action = PF_DROP;
6393                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6394                                 log = 1;
6395                                 goto done;
6396                         }
6397                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6398                             &reason, pd.af)) {
6399                                 DPFPRINTF(PF_DEBUG_MISC,
6400                                     ("pf: IPv6 short rthdr\n"));
6401                                 action = PF_DROP;
6402                                 REASON_SET(&reason, PFRES_SHORT);
6403                                 log = 1;
6404                                 goto done;
6405                         }
6406                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6407                                 DPFPRINTF(PF_DEBUG_MISC,
6408                                     ("pf: IPv6 rthdr0\n"));
6409                                 action = PF_DROP;
6410                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6411                                 log = 1;
6412                                 goto done;
6413                         }
6414                         /* FALLTHROUGH */
6415                 }
6416                 case IPPROTO_AH:
6417                 case IPPROTO_HOPOPTS:
6418                 case IPPROTO_DSTOPTS: {
6419                         /* get next header and header length */
6420                         struct ip6_ext  opt6;
6421
6422                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6423                             NULL, &reason, pd.af)) {
6424                                 DPFPRINTF(PF_DEBUG_MISC,
6425                                     ("pf: IPv6 short opt\n"));
6426                                 action = PF_DROP;
6427                                 log = 1;
6428                                 goto done;
6429                         }
6430                         if (pd.proto == IPPROTO_AH)
6431                                 off += (opt6.ip6e_len + 2) * 4;
6432                         else
6433                                 off += (opt6.ip6e_len + 1) * 8;
6434                         pd.proto = opt6.ip6e_nxt;
6435                         /* goto the next header */
6436                         break;
6437                 }
6438                 default:
6439                         terminal++;
6440                         break;
6441                 }
6442         } while (!terminal);
6443
6444         /* if there's no routing header, use unmodified mbuf for checksumming */
6445         if (!n)
6446                 n = m;
6447
6448         switch (pd.proto) {
6449
6450         case IPPROTO_TCP: {
6451                 struct tcphdr   th;
6452
6453                 pd.hdr.tcp = &th;
6454                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6455                     &action, &reason, AF_INET6)) {
6456                         log = action != PF_PASS;
6457                         goto done;
6458                 }
6459                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6460                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6461                 if (action == PF_DROP)
6462                         goto done;
6463                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6464                     &reason);
6465                 if (action == PF_PASS) {
6466                         if (V_pfsync_update_state_ptr != NULL)
6467                                 V_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         case IPPROTO_UDP: {
6478                 struct udphdr   uh;
6479
6480                 pd.hdr.udp = &uh;
6481                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6482                     &action, &reason, AF_INET6)) {
6483                         log = action != PF_PASS;
6484                         goto done;
6485                 }
6486                 if (uh.uh_dport == 0 ||
6487                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6488                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6489                         action = PF_DROP;
6490                         REASON_SET(&reason, PFRES_SHORT);
6491                         goto done;
6492                 }
6493                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6494                 if (action == PF_PASS) {
6495                         if (V_pfsync_update_state_ptr != NULL)
6496                                 V_pfsync_update_state_ptr(s);
6497                         r = s->rule.ptr;
6498                         a = s->anchor.ptr;
6499                         log = s->log;
6500                 } else if (s == NULL)
6501                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6502                             &a, &ruleset, inp);
6503                 break;
6504         }
6505
6506         case IPPROTO_ICMP: {
6507                 action = PF_DROP;
6508                 DPFPRINTF(PF_DEBUG_MISC,
6509                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6510                 goto done;
6511         }
6512
6513         case IPPROTO_ICMPV6: {
6514                 struct icmp6_hdr        ih;
6515
6516                 pd.hdr.icmp6 = &ih;
6517                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6518                     &action, &reason, AF_INET6)) {
6519                         log = action != PF_PASS;
6520                         goto done;
6521                 }
6522                 action = pf_test_state_icmp(&s, dir, kif,
6523                     m, off, h, &pd, &reason);
6524                 if (action == PF_PASS) {
6525                         if (V_pfsync_update_state_ptr != NULL)
6526                                 V_pfsync_update_state_ptr(s);
6527                         r = s->rule.ptr;
6528                         a = s->anchor.ptr;
6529                         log = s->log;
6530                 } else if (s == NULL)
6531                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6532                             &a, &ruleset, inp);
6533                 break;
6534         }
6535
6536         default:
6537                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6538                 if (action == PF_PASS) {
6539                         if (V_pfsync_update_state_ptr != NULL)
6540                                 V_pfsync_update_state_ptr(s);
6541                         r = s->rule.ptr;
6542                         a = s->anchor.ptr;
6543                         log = s->log;
6544                 } else if (s == NULL)
6545                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6546                             &a, &ruleset, inp);
6547                 break;
6548         }
6549
6550 done:
6551         PF_RULES_RUNLOCK();
6552         if (n != m) {
6553                 m_freem(n);
6554                 n = NULL;
6555         }
6556
6557         /* handle dangerous IPv6 extension headers. */
6558         if (action == PF_PASS && rh_cnt &&
6559             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6560                 action = PF_DROP;
6561                 REASON_SET(&reason, PFRES_IPOPTIONS);
6562                 log = r->log;
6563                 DPFPRINTF(PF_DEBUG_MISC,
6564                     ("pf: dropping packet with dangerous v6 headers\n"));
6565         }
6566
6567         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6568                 action = PF_DROP;
6569                 REASON_SET(&reason, PFRES_MEMORY);
6570         }
6571         if (r->rtableid >= 0)
6572                 M_SETFIB(m, r->rtableid);
6573
6574         if (r->scrub_flags & PFSTATE_SETPRIO) {
6575                 if (pd.tos & IPTOS_LOWDELAY)
6576                         pqid = 1;
6577                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6578                         action = PF_DROP;
6579                         REASON_SET(&reason, PFRES_MEMORY);
6580                         log = 1;
6581                         DPFPRINTF(PF_DEBUG_MISC,
6582                             ("pf: failed to allocate 802.1q mtag\n"));
6583                 }
6584         }
6585
6586 #ifdef ALTQ
6587         if (action == PF_PASS && r->qid) {
6588                 if (pd.pf_mtag == NULL &&
6589                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6590                         action = PF_DROP;
6591                         REASON_SET(&reason, PFRES_MEMORY);
6592                 } else {
6593                         if (s != NULL)
6594                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6595                         if (pd.tos & IPTOS_LOWDELAY)
6596                                 pd.pf_mtag->qid = r->pqid;
6597                         else
6598                                 pd.pf_mtag->qid = r->qid;
6599                         /* Add hints for ecn. */
6600                         pd.pf_mtag->hdr = h;
6601                 }
6602         }
6603 #endif /* ALTQ */
6604
6605         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6606             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6607             (s->nat_rule.ptr->action == PF_RDR ||
6608             s->nat_rule.ptr->action == PF_BINAT) &&
6609             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6610                 m->m_flags |= M_SKIP_FIREWALL;
6611
6612         /* XXX: Anybody working on it?! */
6613         if (r->divert.port)
6614                 printf("pf: divert(9) is not supported for IPv6\n");
6615
6616         if (log) {
6617                 struct pf_rule *lr;
6618
6619                 if (s != NULL && s->nat_rule.ptr != NULL &&
6620                     s->nat_rule.ptr->log & PF_LOG_ALL)
6621                         lr = s->nat_rule.ptr;
6622                 else
6623                         lr = r;
6624                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6625                     &pd, (s == NULL));
6626         }
6627
6628         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6629         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6630
6631         if (action == PF_PASS || r->action == PF_DROP) {
6632                 dirndx = (dir == PF_OUT);
6633                 r->packets[dirndx]++;
6634                 r->bytes[dirndx] += pd.tot_len;
6635                 if (a != NULL) {
6636                         a->packets[dirndx]++;
6637                         a->bytes[dirndx] += pd.tot_len;
6638                 }
6639                 if (s != NULL) {
6640                         if (s->nat_rule.ptr != NULL) {
6641                                 s->nat_rule.ptr->packets[dirndx]++;
6642                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6643                         }
6644                         if (s->src_node != NULL) {
6645                                 s->src_node->packets[dirndx]++;
6646                                 s->src_node->bytes[dirndx] += pd.tot_len;
6647                         }
6648                         if (s->nat_src_node != NULL) {
6649                                 s->nat_src_node->packets[dirndx]++;
6650                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6651                         }
6652                         dirndx = (dir == s->direction) ? 0 : 1;
6653                         s->packets[dirndx]++;
6654                         s->bytes[dirndx] += pd.tot_len;
6655                 }
6656                 tr = r;
6657                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6658                 if (nr != NULL && r == &V_pf_default_rule)
6659                         tr = nr;
6660                 if (tr->src.addr.type == PF_ADDR_TABLE)
6661                         pfr_update_stats(tr->src.addr.p.tbl,
6662                             (s == NULL) ? pd.src :
6663                             &s->key[(s->direction == PF_IN)]->addr[0],
6664                             pd.af, pd.tot_len, dir == PF_OUT,
6665                             r->action == PF_PASS, tr->src.neg);
6666                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6667                         pfr_update_stats(tr->dst.addr.p.tbl,
6668                             (s == NULL) ? pd.dst :
6669                             &s->key[(s->direction == PF_IN)]->addr[1],
6670                             pd.af, pd.tot_len, dir == PF_OUT,
6671                             r->action == PF_PASS, tr->dst.neg);
6672         }
6673
6674         switch (action) {
6675         case PF_SYNPROXY_DROP:
6676                 m_freem(*m0);
6677         case PF_DEFER:
6678                 *m0 = NULL;
6679                 action = PF_PASS;
6680                 break;
6681         case PF_DROP:
6682                 m_freem(*m0);
6683                 *m0 = NULL;
6684                 break;
6685         default:
6686                 /* pf_route6() returns unlocked. */
6687                 if (r->rt) {
6688                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
6689                         return (action);
6690                 }
6691                 break;
6692         }
6693
6694         if (s)
6695                 PF_STATE_UNLOCK(s);
6696
6697         /* If reassembled packet passed, create new fragments. */
6698         if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) &&
6699             (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
6700                 action = pf_refragment6(ifp, m0, mtag);
6701
6702         return (action);
6703 }
6704 #endif /* INET6 */