sys/netpfil/pf/pf.c

   1 /*-
   2  * Copyright (c) 2001 Daniel Hartmeier
   3  * Copyright (c) 2002 - 2008 Henning Brauer
   4  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  *    - Redistributions of source code must retain the above copyright
  12  *      notice, this list of conditions and the following disclaimer.
  13  *    - Redistributions in binary form must reproduce the above
  14  *      copyright notice, this list of conditions and the following
  15  *      disclaimer in the documentation and/or other materials provided
  16  *      with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  26  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  28  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * Effort sponsored in part by the Defense Advanced Research Projects
  32  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  33  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  34  *
  35  *      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "opt_inet.h"
  42 #include "opt_inet6.h"
  43 #include "opt_bpf.h"
  44 #include "opt_pf.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/bus.h>
  48 #include <sys/endian.h>
  49 #include <sys/hash.h>
  50 #include <sys/interrupt.h>
  51 #include <sys/kernel.h>
  52 #include <sys/kthread.h>
  53 #include <sys/limits.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/md5.h>
  56 #include <sys/random.h>
  57 #include <sys/refcount.h>
  58 #include <sys/socket.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/taskqueue.h>
  61 #include <sys/ucred.h>
  62
  63 #include <net/if.h>
  64 #include <net/if_types.h>
  65 #include <net/route.h>
  66 #include <net/radix_mpath.h>
  67 #include <net/vnet.h>
  68
  69 #include <net/pfvar.h>
  70 #include <net/if_pflog.h>
  71 #include <net/if_pfsync.h>
  72
  73 #include <netinet/in_pcb.h>
  74 #include <netinet/in_var.h>
  75 #include <netinet/ip.h>
  76 #include <netinet/ip_fw.h>
  77 #include <netinet/ip_icmp.h>
  78 #include <netinet/icmp_var.h>
  79 #include <netinet/ip_var.h>
  80 #include <netinet/tcp.h>
  81 #include <netinet/tcp_fsm.h>
  82 #include <netinet/tcp_seq.h>
  83 #include <netinet/tcp_timer.h>
  84 #include <netinet/tcp_var.h>
  85 #include <netinet/udp.h>
  86 #include <netinet/udp_var.h>
  87
  88 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
  89
  90 #ifdef INET6
  91 #include <netinet/ip6.h>
  92 #include <netinet/icmp6.h>
  93 #include <netinet6/nd6.h>
  94 #include <netinet6/ip6_var.h>
  95 #include <netinet6/in6_pcb.h>
  96 #endif /* INET6 */
  97
  98 #include <machine/in_cksum.h>
  99 #include <security/mac/mac_framework.h>
 100
 101 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 102
 103 /*
 104  * Global variables
 105  */
 106
 107 /* state tables */
 108 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[2]);
 109 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 110 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 111 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 112 VNET_DEFINE(struct pf_kstatus,           pf_status);
 113
 114 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 115 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 116 VNET_DEFINE(int,                         altqs_inactive_open);
 117 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 118
 119 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 120 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 121 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 122 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 123 VNET_DEFINE(int,                         pf_tcp_secret_init);
 124 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 125 VNET_DEFINE(int,                         pf_tcp_iss_off);
 126 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 127
 128 /*
 129  * Queue for pf_intr() sends.
 130  */
 131 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 132 struct pf_send_entry {
 133         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 134         struct mbuf                     *pfse_m;
 135         enum {
 136                 PFSE_IP,
 137                 PFSE_IP6,
 138                 PFSE_ICMP,
 139                 PFSE_ICMP6,
 140         }                               pfse_type;
 141         union {
 142                 struct route            ro;
 143                 struct {
 144                         int             type;
 145                         int             code;
 146                         int             mtu;
 147                 } icmpopts;
 148         } u;
 149 #define pfse_ro         u.ro
 150 #define pfse_icmp_type  u.icmpopts.type
 151 #define pfse_icmp_code  u.icmpopts.code
 152 #define pfse_icmp_mtu   u.icmpopts.mtu
 153 };
 154
 155 STAILQ_HEAD(pf_send_head, pf_send_entry);
 156 static VNET_DEFINE(struct pf_send_head, pf_sendqueue);
 157 #define V_pf_sendqueue  VNET(pf_sendqueue)
 158
 159 static struct mtx pf_sendqueue_mtx;
 160 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 161 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 162
 163 /*
 164  * Queue for pf_overload_task() tasks.
 165  */
 166 struct pf_overload_entry {
 167         SLIST_ENTRY(pf_overload_entry)  next;
 168         struct pf_addr                  addr;
 169         sa_family_t                     af;
 170         uint8_t                         dir;
 171         struct pf_rule                  *rule;
 172 };
 173
 174 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 175 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue);
 176 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 177 static VNET_DEFINE(struct task, pf_overloadtask);
 178 #define V_pf_overloadtask       VNET(pf_overloadtask)
 179
 180 static struct mtx pf_overloadqueue_mtx;
 181 #define PF_OVERLOADQ_LOCK()     mtx_lock(&pf_overloadqueue_mtx)
 182 #define PF_OVERLOADQ_UNLOCK()   mtx_unlock(&pf_overloadqueue_mtx)
 183
 184 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules);
 185 struct mtx pf_unlnkdrules_mtx;
 186
 187 static VNET_DEFINE(uma_zone_t,  pf_sources_z);
 188 #define V_pf_sources_z  VNET(pf_sources_z)
 189 uma_zone_t              pf_mtag_z;
 190 VNET_DEFINE(uma_zone_t,  pf_state_z);
 191 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 192
 193 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 194 #define PFID_CPUBITS    8
 195 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 196 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 197 #define PFID_MAXID      (~PFID_CPUMASK)
 198 CTASSERT((1 << PFID_CPUBITS) > MAXCPU);
 199
 200 static void              pf_src_tree_remove_state(struct pf_state *);
 201 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 202                             u_int32_t);
 203 static void              pf_add_threshold(struct pf_threshold *);
 204 static int               pf_check_threshold(struct pf_threshold *);
 205
 206 static void              pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 207                             u_int16_t *, u_int16_t *, struct pf_addr *,
 208                             u_int16_t, u_int8_t, sa_family_t);
 209 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 210                             struct tcphdr *, struct pf_state_peer *);
 211 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 212                             struct pf_addr *, struct pf_addr *, u_int16_t,
 213                             u_int16_t *, u_int16_t *, u_int16_t *,
 214                             u_int16_t *, u_int8_t, sa_family_t);
 215 static void              pf_send_tcp(struct mbuf *,
 216                             const struct pf_rule *, sa_family_t,
 217                             const struct pf_addr *, const struct pf_addr *,
 218                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 219                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 220                             u_int16_t, struct ifnet *);
 221 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 222                             sa_family_t, struct pf_rule *);
 223 static void              pf_detach_state(struct pf_state *);
 224 static int               pf_state_key_attach(struct pf_state_key *,
 225                             struct pf_state_key *, struct pf_state *);
 226 static void              pf_state_key_detach(struct pf_state *, int);
 227 static int               pf_state_key_ctor(void *, int, void *, int);
 228 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 229 static int               pf_test_rule(struct pf_rule **, struct pf_state **,
 230                             int, struct pfi_kif *, struct mbuf *, int,
 231                             struct pf_pdesc *, struct pf_rule **,
 232                             struct pf_ruleset **, struct inpcb *);
 233 static int               pf_create_state(struct pf_rule *, struct pf_rule *,
 234                             struct pf_rule *, struct pf_pdesc *,
 235                             struct pf_src_node *, struct pf_state_key *,
 236                             struct pf_state_key *, struct mbuf *, int,
 237                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 238                             struct pf_state **, int, u_int16_t, u_int16_t,
 239                             int);
 240 static int               pf_test_fragment(struct pf_rule **, int,
 241                             struct pfi_kif *, struct mbuf *, void *,
 242                             struct pf_pdesc *, struct pf_rule **,
 243                             struct pf_ruleset **);
 244 static int               pf_tcp_track_full(struct pf_state_peer *,
 245                             struct pf_state_peer *, struct pf_state **,
 246                             struct pfi_kif *, struct mbuf *, int,
 247                             struct pf_pdesc *, u_short *, int *);
 248 static int               pf_tcp_track_sloppy(struct pf_state_peer *,
 249                             struct pf_state_peer *, struct pf_state **,
 250                             struct pf_pdesc *, u_short *);
 251 static int               pf_test_state_tcp(struct pf_state **, int,
 252                             struct pfi_kif *, struct mbuf *, int,
 253                             void *, struct pf_pdesc *, u_short *);
 254 static int               pf_test_state_udp(struct pf_state **, int,
 255                             struct pfi_kif *, struct mbuf *, int,
 256                             void *, struct pf_pdesc *);
 257 static int               pf_test_state_icmp(struct pf_state **, int,
 258                             struct pfi_kif *, struct mbuf *, int,
 259                             void *, struct pf_pdesc *, u_short *);
 260 static int               pf_test_state_other(struct pf_state **, int,
 261                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 262 static u_int8_t          pf_get_wscale(struct mbuf *, int, u_int16_t,
 263                             sa_family_t);
 264 static u_int16_t         pf_get_mss(struct mbuf *, int, u_int16_t,
 265                             sa_family_t);
 266 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 267                                 int, u_int16_t);
 268 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 269                             u_int8_t, sa_family_t);
 270 static void              pf_print_state_parts(struct pf_state *,
 271                             struct pf_state_key *, struct pf_state_key *);
 272 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 273                             struct pf_addr_wrap *);
 274 static struct pf_state  *pf_find_state(struct pfi_kif *,
 275                             struct pf_state_key_cmp *, u_int);
 276 static int               pf_src_connlimit(struct pf_state **);
 277 static void              pf_overload_task(void *v, int pending);
 278 static int               pf_insert_src_node(struct pf_src_node **,
 279                             struct pf_rule *, struct pf_addr *, sa_family_t);
 280 static u_int             pf_purge_expired_states(u_int, int);
 281 static void              pf_purge_unlinked_rules(void);
 282 static int               pf_mtag_uminit(void *, int, int);
 283 static void              pf_mtag_free(struct m_tag *);
 284 #ifdef INET
 285 static void              pf_route(struct mbuf **, struct pf_rule *, int,
 286                             struct ifnet *, struct pf_state *,
 287                             struct pf_pdesc *);
 288 #endif /* INET */
 289 #ifdef INET6
 290 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 291                             struct pf_addr *, u_int8_t);
 292 static void              pf_route6(struct mbuf **, struct pf_rule *, int,
 293                             struct ifnet *, struct pf_state *,
 294                             struct pf_pdesc *);
 295 #endif /* INET6 */
 296
 297 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 298
 299 VNET_DECLARE(int, pf_end_threads);
 300
 301 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 302
 303 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 304                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 305
 306 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 307         do {                                                            \
 308                 (s) = pf_find_state((i), (k), (d));                     \
 309                 if ((s) == NULL)                                        \
 310                         return (PF_DROP);                               \
 311                 if (PACKET_LOOPED(pd))                                  \
 312                         return (PF_PASS);                               \
 313                 if ((d) == PF_OUT &&                                    \
 314                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 315                     (s)->rule.ptr->direction == PF_OUT) ||              \
 316                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 317                     (s)->rule.ptr->direction == PF_IN)) &&              \
 318                     (s)->rt_kif != NULL &&                              \
 319                     (s)->rt_kif != (i))                                 \
 320                         return (PF_PASS);                               \
 321         } while (0)
 322
 323 #define BOUND_IFACE(r, k) \
 324         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 325
 326 #define STATE_INC_COUNTERS(s)                                           \
 327         do {                                                            \
 328                 counter_u64_add(s->rule.ptr->states_cur, 1);            \
 329                 counter_u64_add(s->rule.ptr->states_tot, 1);            \
 330                 if (s->anchor.ptr != NULL) {                            \
 331                         counter_u64_add(s->anchor.ptr->states_cur, 1);  \
 332                         counter_u64_add(s->anchor.ptr->states_tot, 1);  \
 333                 }                                                       \
 334                 if (s->nat_rule.ptr != NULL) {                          \
 335                         counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
 336                         counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
 337                 }                                                       \
 338         } while (0)
 339
 340 #define STATE_DEC_COUNTERS(s)                                           \
 341         do {                                                            \
 342                 if (s->nat_rule.ptr != NULL)                            \
 343                         counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
 344                 if (s->anchor.ptr != NULL)                              \
 345                         counter_u64_add(s->anchor.ptr->states_cur, -1); \
 346                 counter_u64_add(s->rule.ptr->states_cur, -1);           \
 347         } while (0)
 348
 349 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 350 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 351 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 352 VNET_DEFINE(u_long, pf_hashmask);
 353 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 354 VNET_DEFINE(u_long, pf_srchashmask);
 355
 356 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
 357
 358 VNET_DEFINE(u_long, pf_hashsize);
 359 #define V_pf_hashsize   VNET(pf_hashsize)
 360 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 361     &VNET_NAME(pf_hashsize), 0, "Size of pf(4) states hashtable");
 362
 363 VNET_DEFINE(u_long, pf_srchashsize);
 364 #define V_pf_srchashsize        VNET(pf_srchashsize)
 365 SYSCTL_VNET_UINT(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 366     &VNET_NAME(pf_srchashsize), 0, "Size of pf(4) source nodes hashtable");
 367
 368 VNET_DEFINE(void *, pf_swi_cookie);
 369
 370 VNET_DEFINE(uint32_t, pf_hashseed);
 371 #define V_pf_hashseed   VNET(pf_hashseed)
 372
 373 static __inline uint32_t
 374 pf_hashkey(struct pf_state_key *sk)
 375 {
 376         uint32_t h;
 377
 378         h = jenkins_hash32((uint32_t *)sk,
 379             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 380             V_pf_hashseed);
 381
 382         return (h & V_pf_hashmask);
 383 }
 384
 385 static __inline uint32_t
 386 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 387 {
 388         uint32_t h;
 389
 390         switch (af) {
 391         case AF_INET:
 392                 h = jenkins_hash32((uint32_t *)&addr->v4,
 393                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 394                 break;
 395         case AF_INET6:
 396                 h = jenkins_hash32((uint32_t *)&addr->v6,
 397                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 398                 break;
 399         default:
 400                 panic("%s: unknown address family %u", __func__, af);
 401         }
 402
 403         return (h & V_pf_srchashmask);
 404 }
 405
 406 #ifdef INET6
 407 void
 408 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 409 {
 410         switch (af) {
 411 #ifdef INET
 412         case AF_INET:
 413                 dst->addr32[0] = src->addr32[0];
 414                 break;
 415 #endif /* INET */
 416         case AF_INET6:
 417                 dst->addr32[0] = src->addr32[0];
 418                 dst->addr32[1] = src->addr32[1];
 419                 dst->addr32[2] = src->addr32[2];
 420                 dst->addr32[3] = src->addr32[3];
 421                 break;
 422         }
 423 }
 424 #endif /* INET6 */
 425
 426 static void
 427 pf_init_threshold(struct pf_threshold *threshold,
 428     u_int32_t limit, u_int32_t seconds)
 429 {
 430         threshold->limit = limit * PF_THRESHOLD_MULT;
 431         threshold->seconds = seconds;
 432         threshold->count = 0;
 433         threshold->last = time_uptime;
 434 }
 435
 436 static void
 437 pf_add_threshold(struct pf_threshold *threshold)
 438 {
 439         u_int32_t t = time_uptime, diff = t - threshold->last;
 440
 441         if (diff >= threshold->seconds)
 442                 threshold->count = 0;
 443         else
 444                 threshold->count -= threshold->count * diff /
 445                     threshold->seconds;
 446         threshold->count += PF_THRESHOLD_MULT;
 447         threshold->last = t;
 448 }
 449
 450 static int
 451 pf_check_threshold(struct pf_threshold *threshold)
 452 {
 453         return (threshold->count > threshold->limit);
 454 }
 455
 456 static int
 457 pf_src_connlimit(struct pf_state **state)
 458 {
 459         struct pf_overload_entry *pfoe;
 460         int bad = 0;
 461
 462         PF_STATE_LOCK_ASSERT(*state);
 463
 464         (*state)->src_node->conn++;
 465         (*state)->src.tcp_est = 1;
 466         pf_add_threshold(&(*state)->src_node->conn_rate);
 467
 468         if ((*state)->rule.ptr->max_src_conn &&
 469             (*state)->rule.ptr->max_src_conn <
 470             (*state)->src_node->conn) {
 471                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
 472                 bad++;
 473         }
 474
 475         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 476             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 477                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
 478                 bad++;
 479         }
 480
 481         if (!bad)
 482                 return (0);
 483
 484         /* Kill this state. */
 485         (*state)->timeout = PFTM_PURGE;
 486         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 487
 488         if ((*state)->rule.ptr->overload_tbl == NULL)
 489                 return (1);
 490
 491         /* Schedule overloading and flushing task. */
 492         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 493         if (pfoe == NULL)
 494                 return (1);     /* too bad :( */
 495
 496         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 497         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 498         pfoe->rule = (*state)->rule.ptr;
 499         pfoe->dir = (*state)->direction;
 500         PF_OVERLOADQ_LOCK();
 501         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 502         PF_OVERLOADQ_UNLOCK();
 503         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 504
 505         return (1);
 506 }
 507
 508 static void
 509 pf_overload_task(void *v, int pending)
 510 {
 511         struct pf_overload_head queue;
 512         struct pfr_addr p;
 513         struct pf_overload_entry *pfoe, *pfoe1;
 514         uint32_t killed = 0;
 515
 516         CURVNET_SET((struct vnet *)v);
 517
 518         PF_OVERLOADQ_LOCK();
 519         queue = V_pf_overloadqueue;
 520         SLIST_INIT(&V_pf_overloadqueue);
 521         PF_OVERLOADQ_UNLOCK();
 522
 523         bzero(&p, sizeof(p));
 524         SLIST_FOREACH(pfoe, &queue, next) {
 525                 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
 526                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 527                         printf("%s: blocking address ", __func__);
 528                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 529                         printf("\n");
 530                 }
 531
 532                 p.pfra_af = pfoe->af;
 533                 switch (pfoe->af) {
 534 #ifdef INET
 535                 case AF_INET:
 536                         p.pfra_net = 32;
 537                         p.pfra_ip4addr = pfoe->addr.v4;
 538                         break;
 539 #endif
 540 #ifdef INET6
 541                 case AF_INET6:
 542                         p.pfra_net = 128;
 543                         p.pfra_ip6addr = pfoe->addr.v6;
 544                         break;
 545 #endif
 546                 }
 547
 548                 PF_RULES_WLOCK();
 549                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 550                 PF_RULES_WUNLOCK();
 551         }
 552
 553         /*
 554          * Remove those entries, that don't need flushing.
 555          */
 556         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 557                 if (pfoe->rule->flush == 0) {
 558                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 559                         free(pfoe, M_PFTEMP);
 560                 } else
 561                         counter_u64_add(
 562                             V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
 563
 564         /* If nothing to flush, return. */
 565         if (SLIST_EMPTY(&queue)) {
 566                 CURVNET_RESTORE();
 567                 return;
 568         }
 569
 570         for (int i = 0; i <= V_pf_hashmask; i++) {
 571                 struct pf_idhash *ih = &V_pf_idhash[i];
 572                 struct pf_state_key *sk;
 573                 struct pf_state *s;
 574
 575                 PF_HASHROW_LOCK(ih);
 576                 LIST_FOREACH(s, &ih->states, entry) {
 577                     sk = s->key[PF_SK_WIRE];
 578                     SLIST_FOREACH(pfoe, &queue, next)
 579                         if (sk->af == pfoe->af &&
 580                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 581                             pfoe->rule == s->rule.ptr) &&
 582                             ((pfoe->dir == PF_OUT &&
 583                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 584                             (pfoe->dir == PF_IN &&
 585                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 586                                 s->timeout = PFTM_PURGE;
 587                                 s->src.state = s->dst.state = TCPS_CLOSED;
 588                                 killed++;
 589                         }
 590                 }
 591                 PF_HASHROW_UNLOCK(ih);
 592         }
 593         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 594                 free(pfoe, M_PFTEMP);
 595         if (V_pf_status.debug >= PF_DEBUG_MISC)
 596                 printf("%s: %u states killed", __func__, killed);
 597
 598         CURVNET_RESTORE();
 599 }
 600
 601 /*
 602  * Can return locked on failure, so that we can consistently
 603  * allocate and insert a new one.
 604  */
 605 struct pf_src_node *
 606 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
 607         int returnlocked)
 608 {
 609         struct pf_srchash *sh;
 610         struct pf_src_node *n;
 611
 612         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
 613
 614         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 615         PF_HASHROW_LOCK(sh);
 616         LIST_FOREACH(n, &sh->nodes, entry)
 617                 if (n->rule.ptr == rule && n->af == af &&
 618                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 619                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 620                         break;
 621         if (n != NULL || returnlocked == 0)
 622                 PF_HASHROW_UNLOCK(sh);
 623
 624         return (n);
 625 }
 626
 627 static int
 628 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 629     struct pf_addr *src, sa_family_t af)
 630 {
 631
 632         KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
 633             rule->rpool.opts & PF_POOL_STICKYADDR),
 634             ("%s for non-tracking rule %p", __func__, rule));
 635
 636         if (*sn == NULL)
 637                 *sn = pf_find_src_node(src, rule, af, 1);
 638
 639         if (*sn == NULL) {
 640                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 641
 642                 PF_HASHROW_ASSERT(sh);
 643
 644                 if (!rule->max_src_nodes ||
 645                     counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
 646                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 647                 else
 648                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
 649                             1);
 650                 if ((*sn) == NULL) {
 651                         PF_HASHROW_UNLOCK(sh);
 652                         return (-1);
 653                 }
 654
 655                 pf_init_threshold(&(*sn)->conn_rate,
 656                     rule->max_src_conn_rate.limit,
 657                     rule->max_src_conn_rate.seconds);
 658
 659                 (*sn)->af = af;
 660                 (*sn)->rule.ptr = rule;
 661                 PF_ACPY(&(*sn)->addr, src, af);
 662                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 663                 (*sn)->creation = time_uptime;
 664                 (*sn)->ruletype = rule->action;
 665                 if ((*sn)->rule.ptr != NULL)
 666                         counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
 667                 PF_HASHROW_UNLOCK(sh);
 668                 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
 669         } else {
 670                 if (rule->max_src_states &&
 671                     (*sn)->states >= rule->max_src_states) {
 672                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
 673                             1);
 674                         return (-1);
 675                 }
 676         }
 677         return (0);
 678 }
 679
 680 void
 681 pf_unlink_src_node_locked(struct pf_src_node *src)
 682 {
 683 #ifdef INVARIANTS
 684         struct pf_srchash *sh;
 685
 686         sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)];
 687         PF_HASHROW_ASSERT(sh);
 688 #endif
 689         LIST_REMOVE(src, entry);
 690         if (src->rule.ptr)
 691                 counter_u64_add(src->rule.ptr->src_nodes, -1);
 692         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
 693 }
 694
 695 void
 696 pf_unlink_src_node(struct pf_src_node *src)
 697 {
 698         struct pf_srchash *sh;
 699
 700         sh = &V_pf_srchash[pf_hashsrc(&src->addr, src->af)];
 701         PF_HASHROW_LOCK(sh);
 702         pf_unlink_src_node_locked(src);
 703         PF_HASHROW_UNLOCK(sh);
 704 }
 705
 706 static void
 707 pf_free_src_node(struct pf_src_node *sn)
 708 {
 709
 710         KASSERT(sn->states == 0, ("%s: %p has refs", __func__, sn));
 711         uma_zfree(V_pf_sources_z, sn);
 712 }
 713
 714 u_int
 715 pf_free_src_nodes(struct pf_src_node_list *head)
 716 {
 717         struct pf_src_node *sn, *tmp;
 718         u_int count = 0;
 719
 720         LIST_FOREACH_SAFE(sn, head, entry, tmp) {
 721                 pf_free_src_node(sn);
 722                 count++;
 723         }
 724
 725         return (count);
 726 }
 727
 728 void
 729 pf_mtag_initialize()
 730 {
 731
 732         pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 733             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
 734             UMA_ALIGN_PTR, 0);
 735 }
 736
 737 /* Per-vnet data storage structures initialization. */
 738 void
 739 pf_initialize()
 740 {
 741         struct pf_keyhash       *kh;
 742         struct pf_idhash        *ih;
 743         struct pf_srchash       *sh;
 744         u_int i;
 745
 746         TUNABLE_ULONG_FETCH("net.pf.states_hashsize", &V_pf_hashsize);
 747         if (V_pf_hashsize == 0 || !powerof2(V_pf_hashsize))
 748                 V_pf_hashsize = PF_HASHSIZ;
 749         TUNABLE_ULONG_FETCH("net.pf.source_nodes_hashsize", &V_pf_srchashsize);
 750         if (V_pf_srchashsize == 0 || !powerof2(V_pf_srchashsize))
 751                 V_pf_srchashsize = PF_HASHSIZ / 4;
 752
 753         V_pf_hashseed = arc4random();
 754
 755         /* States and state keys storage. */
 756         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
 757             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 758         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
 759         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
 760         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
 761
 762         V_pf_state_key_z = uma_zcreate("pf state keys",
 763             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
 764             UMA_ALIGN_PTR, 0);
 765         V_pf_keyhash = malloc(V_pf_hashsize * sizeof(struct pf_keyhash),
 766             M_PFHASH, M_WAITOK | M_ZERO);
 767         V_pf_idhash = malloc(V_pf_hashsize * sizeof(struct pf_idhash),
 768             M_PFHASH, M_WAITOK | M_ZERO);
 769         V_pf_hashmask = V_pf_hashsize - 1;
 770         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask;
 771             i++, kh++, ih++) {
 772                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
 773                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
 774         }
 775
 776         /* Source nodes. */
 777         V_pf_sources_z = uma_zcreate("pf source nodes",
 778             sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
 779             0);
 780         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
 781         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
 782         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
 783         V_pf_srchash = malloc(V_pf_srchashsize * sizeof(struct pf_srchash),
 784           M_PFHASH, M_WAITOK|M_ZERO);
 785         V_pf_srchashmask = V_pf_srchashsize - 1;
 786         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++)
 787                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
 788
 789         /* ALTQ */
 790         TAILQ_INIT(&V_pf_altqs[0]);
 791         TAILQ_INIT(&V_pf_altqs[1]);
 792         TAILQ_INIT(&V_pf_pabuf);
 793         V_pf_altqs_active = &V_pf_altqs[0];
 794         V_pf_altqs_inactive = &V_pf_altqs[1];
 795
 796
 797         /* Send & overload+flush queues. */
 798         STAILQ_INIT(&V_pf_sendqueue);
 799         SLIST_INIT(&V_pf_overloadqueue);
 800         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
 801         mtx_init(&pf_sendqueue_mtx, "pf send queue", NULL, MTX_DEF);
 802         mtx_init(&pf_overloadqueue_mtx, "pf overload/flush queue", NULL,
 803             MTX_DEF);
 804
 805         /* Unlinked, but may be referenced rules. */
 806         TAILQ_INIT(&V_pf_unlinked_rules);
 807         mtx_init(&pf_unlnkdrules_mtx, "pf unlinked rules", NULL, MTX_DEF);
 808 }
 809
 810 void
 811 pf_mtag_cleanup()
 812 {
 813
 814         uma_zdestroy(pf_mtag_z);
 815 }
 816
 817 void
 818 pf_cleanup()
 819 {
 820         struct pf_keyhash       *kh;
 821         struct pf_idhash        *ih;
 822         struct pf_srchash       *sh;
 823         struct pf_send_entry    *pfse, *next;
 824         u_int i;
 825
 826         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= V_pf_hashmask;
 827             i++, kh++, ih++) {
 828                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
 829                     __func__));
 830                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
 831                     __func__));
 832                 mtx_destroy(&kh->lock);
 833                 mtx_destroy(&ih->lock);
 834         }
 835         free(V_pf_keyhash, M_PFHASH);
 836         free(V_pf_idhash, M_PFHASH);
 837
 838         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) {
 839                 KASSERT(LIST_EMPTY(&sh->nodes),
 840                     ("%s: source node hash not empty", __func__));
 841                 mtx_destroy(&sh->lock);
 842         }
 843         free(V_pf_srchash, M_PFHASH);
 844
 845         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
 846                 m_freem(pfse->pfse_m);
 847                 free(pfse, M_PFTEMP);
 848         }
 849
 850         mtx_destroy(&pf_sendqueue_mtx);
 851         mtx_destroy(&pf_overloadqueue_mtx);
 852         mtx_destroy(&pf_unlnkdrules_mtx);
 853
 854         uma_zdestroy(V_pf_sources_z);
 855         uma_zdestroy(V_pf_state_z);
 856         uma_zdestroy(V_pf_state_key_z);
 857 }
 858
 859 static int
 860 pf_mtag_uminit(void *mem, int size, int how)
 861 {
 862         struct m_tag *t;
 863
 864         t = (struct m_tag *)mem;
 865         t->m_tag_cookie = MTAG_ABI_COMPAT;
 866         t->m_tag_id = PACKET_TAG_PF;
 867         t->m_tag_len = sizeof(struct pf_mtag);
 868         t->m_tag_free = pf_mtag_free;
 869
 870         return (0);
 871 }
 872
 873 static void
 874 pf_mtag_free(struct m_tag *t)
 875 {
 876
 877         uma_zfree(pf_mtag_z, t);
 878 }
 879
 880 struct pf_mtag *
 881 pf_get_mtag(struct mbuf *m)
 882 {
 883         struct m_tag *mtag;
 884
 885         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 886                 return ((struct pf_mtag *)(mtag + 1));
 887
 888         mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
 889         if (mtag == NULL)
 890                 return (NULL);
 891         bzero(mtag + 1, sizeof(struct pf_mtag));
 892         m_tag_prepend(m, mtag);
 893
 894         return ((struct pf_mtag *)(mtag + 1));
 895 }
 896
 897 static int
 898 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
 899     struct pf_state *s)
 900 {
 901         struct pf_keyhash       *khs, *khw, *kh;
 902         struct pf_state_key     *sk, *cur;
 903         struct pf_state         *si, *olds = NULL;
 904         int idx;
 905
 906         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
 907         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
 908         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
 909
 910         /*
 911          * We need to lock hash slots of both keys. To avoid deadlock
 912          * we always lock the slot with lower address first. Unlock order
 913          * isn't important.
 914          *
 915          * We also need to lock ID hash slot before dropping key
 916          * locks. On success we return with ID hash slot locked.
 917          */
 918
 919         if (skw == sks) {
 920                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
 921                 PF_HASHROW_LOCK(khs);
 922         } else {
 923                 khs = &V_pf_keyhash[pf_hashkey(sks)];
 924                 khw = &V_pf_keyhash[pf_hashkey(skw)];
 925                 if (khs == khw) {
 926                         PF_HASHROW_LOCK(khs);
 927                 } else if (khs < khw) {
 928                         PF_HASHROW_LOCK(khs);
 929                         PF_HASHROW_LOCK(khw);
 930                 } else {
 931                         PF_HASHROW_LOCK(khw);
 932                         PF_HASHROW_LOCK(khs);
 933                 }
 934         }
 935
 936 #define KEYS_UNLOCK()   do {                    \
 937         if (khs != khw) {                       \
 938                 PF_HASHROW_UNLOCK(khs);         \
 939                 PF_HASHROW_UNLOCK(khw);         \
 940         } else                                  \
 941                 PF_HASHROW_UNLOCK(khs);         \
 942 } while (0)
 943
 944         /*
 945          * First run: start with wire key.
 946          */
 947         sk = skw;
 948         kh = khw;
 949         idx = PF_SK_WIRE;
 950
 951 keyattach:
 952         LIST_FOREACH(cur, &kh->keys, entry)
 953                 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
 954                         break;
 955
 956         if (cur != NULL) {
 957                 /* Key exists. Check for same kif, if none, add to key. */
 958                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
 959                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
 960
 961                         PF_HASHROW_LOCK(ih);
 962                         if (si->kif == s->kif &&
 963                             si->direction == s->direction) {
 964                                 if (sk->proto == IPPROTO_TCP &&
 965                                     si->src.state >= TCPS_FIN_WAIT_2 &&
 966                                     si->dst.state >= TCPS_FIN_WAIT_2) {
 967                                         /*
 968                                          * New state matches an old >FIN_WAIT_2
 969                                          * state. We can't drop key hash locks,
 970                                          * thus we can't unlink it properly.
 971                                          *
 972                                          * As a workaround we drop it into
 973                                          * TCPS_CLOSED state, schedule purge
 974                                          * ASAP and push it into the very end
 975                                          * of the slot TAILQ, so that it won't
 976                                          * conflict with our new state.
 977                                          */
 978                                         si->src.state = si->dst.state =
 979                                             TCPS_CLOSED;
 980                                         si->timeout = PFTM_PURGE;
 981                                         olds = si;
 982                                 } else {
 983                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
 984                                                 printf("pf: %s key attach "
 985                                                     "failed on %s: ",
 986                                                     (idx == PF_SK_WIRE) ?
 987                                                     "wire" : "stack",
 988                                                     s->kif->pfik_name);
 989                                                 pf_print_state_parts(s,
 990                                                     (idx == PF_SK_WIRE) ?
 991                                                     sk : NULL,
 992                                                     (idx == PF_SK_STACK) ?
 993                                                     sk : NULL);
 994                                                 printf(", existing: ");
 995                                                 pf_print_state_parts(si,
 996                                                     (idx == PF_SK_WIRE) ?
 997                                                     sk : NULL,
 998                                                     (idx == PF_SK_STACK) ?
 999                                                     sk : NULL);
1000                                                 printf("\n");
1001                                         }
1002                                         PF_HASHROW_UNLOCK(ih);
1003                                         KEYS_UNLOCK();
1004                                         uma_zfree(V_pf_state_key_z, sk);
1005                                         if (idx == PF_SK_STACK)
1006                                                 pf_detach_state(s);
1007                                         return (EEXIST); /* collision! */
1008                                 }
1009                         }
1010                         PF_HASHROW_UNLOCK(ih);
1011                 }
1012                 uma_zfree(V_pf_state_key_z, sk);
1013                 s->key[idx] = cur;
1014         } else {
1015                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1016                 s->key[idx] = sk;
1017         }
1018
1019 stateattach:
1020         /* List is sorted, if-bound states before floating. */
1021         if (s->kif == V_pfi_all)
1022                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1023         else
1024                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1025
1026         if (olds) {
1027                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1028                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1029                     key_list[idx]);
1030                 olds = NULL;
1031         }
1032
1033         /*
1034          * Attach done. See how should we (or should not?)
1035          * attach a second key.
1036          */
1037         if (sks == skw) {
1038                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1039                 idx = PF_SK_STACK;
1040                 sks = NULL;
1041                 goto stateattach;
1042         } else if (sks != NULL) {
1043                 /*
1044                  * Continue attaching with stack key.
1045                  */
1046                 sk = sks;
1047                 kh = khs;
1048                 idx = PF_SK_STACK;
1049                 sks = NULL;
1050                 goto keyattach;
1051         }
1052
1053         PF_STATE_LOCK(s);
1054         KEYS_UNLOCK();
1055
1056         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1057             ("%s failure", __func__));
1058
1059         return (0);
1060 #undef  KEYS_UNLOCK
1061 }
1062
1063 static void
1064 pf_detach_state(struct pf_state *s)
1065 {
1066         struct pf_state_key *sks = s->key[PF_SK_STACK];
1067         struct pf_keyhash *kh;
1068
1069         if (sks != NULL) {
1070                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1071                 PF_HASHROW_LOCK(kh);
1072                 if (s->key[PF_SK_STACK] != NULL)
1073                         pf_state_key_detach(s, PF_SK_STACK);
1074                 /*
1075                  * If both point to same key, then we are done.
1076                  */
1077                 if (sks == s->key[PF_SK_WIRE]) {
1078                         pf_state_key_detach(s, PF_SK_WIRE);
1079                         PF_HASHROW_UNLOCK(kh);
1080                         return;
1081                 }
1082                 PF_HASHROW_UNLOCK(kh);
1083         }
1084
1085         if (s->key[PF_SK_WIRE] != NULL) {
1086                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1087                 PF_HASHROW_LOCK(kh);
1088                 if (s->key[PF_SK_WIRE] != NULL)
1089                         pf_state_key_detach(s, PF_SK_WIRE);
1090                 PF_HASHROW_UNLOCK(kh);
1091         }
1092 }
1093
1094 static void
1095 pf_state_key_detach(struct pf_state *s, int idx)
1096 {
1097         struct pf_state_key *sk = s->key[idx];
1098 #ifdef INVARIANTS
1099         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1100
1101         PF_HASHROW_ASSERT(kh);
1102 #endif
1103         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1104         s->key[idx] = NULL;
1105
1106         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1107                 LIST_REMOVE(sk, entry);
1108                 uma_zfree(V_pf_state_key_z, sk);
1109         }
1110 }
1111
1112 static int
1113 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1114 {
1115         struct pf_state_key *sk = mem;
1116
1117         bzero(sk, sizeof(struct pf_state_key_cmp));
1118         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1119         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1120
1121         return (0);
1122 }
1123
1124 struct pf_state_key *
1125 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1126         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1127 {
1128         struct pf_state_key *sk;
1129
1130         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1131         if (sk == NULL)
1132                 return (NULL);
1133
1134         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1135         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1136         sk->port[pd->sidx] = sport;
1137         sk->port[pd->didx] = dport;
1138         sk->proto = pd->proto;
1139         sk->af = pd->af;
1140
1141         return (sk);
1142 }
1143
1144 struct pf_state_key *
1145 pf_state_key_clone(struct pf_state_key *orig)
1146 {
1147         struct pf_state_key *sk;
1148
1149         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1150         if (sk == NULL)
1151                 return (NULL);
1152
1153         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1154
1155         return (sk);
1156 }
1157
1158 int
1159 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1160     struct pf_state_key *sks, struct pf_state *s)
1161 {
1162         struct pf_idhash *ih;
1163         struct pf_state *cur;
1164         int error;
1165
1166         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1167             ("%s: sks not pristine", __func__));
1168         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1169             ("%s: skw not pristine", __func__));
1170         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1171
1172         s->kif = kif;
1173
1174         if (s->id == 0 && s->creatorid == 0) {
1175                 /* XXX: should be atomic, but probability of collision low */
1176                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1177                         V_pf_stateid[curcpu] = 1;
1178                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1179                 s->id = htobe64(s->id);
1180                 s->creatorid = V_pf_status.hostid;
1181         }
1182
1183         /* Returns with ID locked on success. */
1184         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1185                 return (error);
1186
1187         ih = &V_pf_idhash[PF_IDHASH(s)];
1188         PF_HASHROW_ASSERT(ih);
1189         LIST_FOREACH(cur, &ih->states, entry)
1190                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1191                         break;
1192
1193         if (cur != NULL) {
1194                 PF_HASHROW_UNLOCK(ih);
1195                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1196                         printf("pf: state ID collision: "
1197                             "id: %016llx creatorid: %08x\n",
1198                             (unsigned long long)be64toh(s->id),
1199                             ntohl(s->creatorid));
1200                 }
1201                 pf_detach_state(s);
1202                 return (EEXIST);
1203         }
1204         LIST_INSERT_HEAD(&ih->states, s, entry);
1205         /* One for keys, one for ID hash. */
1206         refcount_init(&s->refs, 2);
1207
1208         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1209         if (pfsync_insert_state_ptr != NULL)
1210                 pfsync_insert_state_ptr(s);
1211
1212         /* Returns locked. */
1213         return (0);
1214 }
1215
1216 /*
1217  * Find state by ID: returns with locked row on success.
1218  */
1219 struct pf_state *
1220 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1221 {
1222         struct pf_idhash *ih;
1223         struct pf_state *s;
1224
1225         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1226
1227         ih = &V_pf_idhash[(be64toh(id) % (V_pf_hashmask + 1))];
1228
1229         PF_HASHROW_LOCK(ih);
1230         LIST_FOREACH(s, &ih->states, entry)
1231                 if (s->id == id && s->creatorid == creatorid)
1232                         break;
1233
1234         if (s == NULL)
1235                 PF_HASHROW_UNLOCK(ih);
1236
1237         return (s);
1238 }
1239
1240 /*
1241  * Find state by key.
1242  * Returns with ID hash slot locked on success.
1243  */
1244 static struct pf_state *
1245 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1246 {
1247         struct pf_keyhash       *kh;
1248         struct pf_state_key     *sk;
1249         struct pf_state         *s;
1250         int idx;
1251
1252         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1253
1254         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1255
1256         PF_HASHROW_LOCK(kh);
1257         LIST_FOREACH(sk, &kh->keys, entry)
1258                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1259                         break;
1260         if (sk == NULL) {
1261                 PF_HASHROW_UNLOCK(kh);
1262                 return (NULL);
1263         }
1264
1265         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1266
1267         /* List is sorted, if-bound states before floating ones. */
1268         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1269                 if (s->kif == V_pfi_all || s->kif == kif) {
1270                         PF_STATE_LOCK(s);
1271                         PF_HASHROW_UNLOCK(kh);
1272                         if (s->timeout >= PFTM_MAX) {
1273                                 /*
1274                                  * State is either being processed by
1275                                  * pf_unlink_state() in an other thread, or
1276                                  * is scheduled for immediate expiry.
1277                                  */
1278                                 PF_STATE_UNLOCK(s);
1279                                 return (NULL);
1280                         }
1281                         return (s);
1282                 }
1283         PF_HASHROW_UNLOCK(kh);
1284
1285         return (NULL);
1286 }
1287
1288 struct pf_state *
1289 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1290 {
1291         struct pf_keyhash       *kh;
1292         struct pf_state_key     *sk;
1293         struct pf_state         *s, *ret = NULL;
1294         int                      idx, inout = 0;
1295
1296         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1297
1298         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1299
1300         PF_HASHROW_LOCK(kh);
1301         LIST_FOREACH(sk, &kh->keys, entry)
1302                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1303                         break;
1304         if (sk == NULL) {
1305                 PF_HASHROW_UNLOCK(kh);
1306                 return (NULL);
1307         }
1308         switch (dir) {
1309         case PF_IN:
1310                 idx = PF_SK_WIRE;
1311                 break;
1312         case PF_OUT:
1313                 idx = PF_SK_STACK;
1314                 break;
1315         case PF_INOUT:
1316                 idx = PF_SK_WIRE;
1317                 inout = 1;
1318                 break;
1319         default:
1320                 panic("%s: dir %u", __func__, dir);
1321         }
1322 second_run:
1323         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1324                 if (more == NULL) {
1325                         PF_HASHROW_UNLOCK(kh);
1326                         return (s);
1327                 }
1328
1329                 if (ret)
1330                         (*more)++;
1331                 else
1332                         ret = s;
1333         }
1334         if (inout == 1) {
1335                 inout = 0;
1336                 idx = PF_SK_STACK;
1337                 goto second_run;
1338         }
1339         PF_HASHROW_UNLOCK(kh);
1340
1341         return (ret);
1342 }
1343
1344 /* END state table stuff */
1345
1346 static void
1347 pf_send(struct pf_send_entry *pfse)
1348 {
1349
1350         PF_SENDQ_LOCK();
1351         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1352         PF_SENDQ_UNLOCK();
1353         swi_sched(V_pf_swi_cookie, 0);
1354 }
1355
1356 void
1357 pf_intr(void *v)
1358 {
1359         struct pf_send_head queue;
1360         struct pf_send_entry *pfse, *next;
1361
1362         CURVNET_SET((struct vnet *)v);
1363
1364         PF_SENDQ_LOCK();
1365         queue = V_pf_sendqueue;
1366         STAILQ_INIT(&V_pf_sendqueue);
1367         PF_SENDQ_UNLOCK();
1368
1369         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1370                 switch (pfse->pfse_type) {
1371 #ifdef INET
1372                 case PFSE_IP:
1373                         ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1374                         break;
1375                 case PFSE_ICMP:
1376                         icmp_error(pfse->pfse_m, pfse->pfse_icmp_type,
1377                             pfse->pfse_icmp_code, 0, pfse->pfse_icmp_mtu);
1378                         break;
1379 #endif /* INET */
1380 #ifdef INET6
1381                 case PFSE_IP6:
1382                         ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1383                             NULL);
1384                         break;
1385                 case PFSE_ICMP6:
1386                         icmp6_error(pfse->pfse_m, pfse->pfse_icmp_type,
1387                             pfse->pfse_icmp_code, pfse->pfse_icmp_mtu);
1388                         break;
1389 #endif /* INET6 */
1390                 default:
1391                         panic("%s: unknown type", __func__);
1392                 }
1393                 free(pfse, M_PFTEMP);
1394         }
1395         CURVNET_RESTORE();
1396 }
1397
1398 void
1399 pf_purge_thread(void *v)
1400 {
1401         u_int idx = 0;
1402
1403         CURVNET_SET((struct vnet *)v);
1404
1405         for (;;) {
1406                 PF_RULES_RLOCK();
1407                 rw_sleep(pf_purge_thread, &pf_rules_lock, 0, "pftm", hz / 10);
1408
1409                 if (V_pf_end_threads) {
1410                         /*
1411                          * To cleanse up all kifs and rules we need
1412                          * two runs: first one clears reference flags,
1413                          * then pf_purge_expired_states() doesn't
1414                          * raise them, and then second run frees.
1415                          */
1416                         PF_RULES_RUNLOCK();
1417                         pf_purge_unlinked_rules();
1418                         pfi_kif_purge();
1419
1420                         /*
1421                          * Now purge everything.
1422                          */
1423                         pf_purge_expired_states(0, V_pf_hashmask);
1424                         pf_purge_expired_fragments();
1425                         pf_purge_expired_src_nodes();
1426
1427                         /*
1428                          * Now all kifs & rules should be unreferenced,
1429                          * thus should be successfully freed.
1430                          */
1431                         pf_purge_unlinked_rules();
1432                         pfi_kif_purge();
1433
1434                         /*
1435                          * Announce success and exit.
1436                          */
1437                         PF_RULES_RLOCK();
1438                         V_pf_end_threads++;
1439                         PF_RULES_RUNLOCK();
1440                         wakeup(pf_purge_thread);
1441                         kproc_exit(0);
1442                 }
1443                 PF_RULES_RUNLOCK();
1444
1445                 /* Process 1/interval fraction of the state table every run. */
1446                 idx = pf_purge_expired_states(idx, V_pf_hashmask /
1447                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1448
1449                 /* Purge other expired types every PFTM_INTERVAL seconds. */
1450                 if (idx == 0) {
1451                         /*
1452                          * Order is important:
1453                          * - states and src nodes reference rules
1454                          * - states and rules reference kifs
1455                          */
1456                         pf_purge_expired_fragments();
1457                         pf_purge_expired_src_nodes();
1458                         pf_purge_unlinked_rules();
1459                         pfi_kif_purge();
1460                 }
1461         }
1462         /* not reached */
1463         CURVNET_RESTORE();
1464 }
1465
1466 u_int32_t
1467 pf_state_expires(const struct pf_state *state)
1468 {
1469         u_int32_t       timeout;
1470         u_int32_t       start;
1471         u_int32_t       end;
1472         u_int32_t       states;
1473
1474         /* handle all PFTM_* > PFTM_MAX here */
1475         if (state->timeout == PFTM_PURGE)
1476                 return (time_uptime);
1477         KASSERT(state->timeout != PFTM_UNLINKED,
1478             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1479         KASSERT((state->timeout < PFTM_MAX),
1480             ("pf_state_expires: timeout > PFTM_MAX"));
1481         timeout = state->rule.ptr->timeout[state->timeout];
1482         if (!timeout)
1483                 timeout = V_pf_default_rule.timeout[state->timeout];
1484         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1485         if (start) {
1486                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1487                 states = counter_u64_fetch(state->rule.ptr->states_cur);
1488         } else {
1489                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1490                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1491                 states = V_pf_status.states;
1492         }
1493         if (end && states > start && start < end) {
1494                 if (states < end)
1495                         return (state->expire + timeout * (end - states) /
1496                             (end - start));
1497                 else
1498                         return (time_uptime);
1499         }
1500         return (state->expire + timeout);
1501 }
1502
1503 void
1504 pf_purge_expired_src_nodes()
1505 {
1506         struct pf_src_node_list  freelist;
1507         struct pf_srchash       *sh;
1508         struct pf_src_node      *cur, *next;
1509         int i;
1510
1511         LIST_INIT(&freelist);
1512         for (i = 0, sh = V_pf_srchash; i <= V_pf_srchashmask; i++, sh++) {
1513             PF_HASHROW_LOCK(sh);
1514             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1515                 if (cur->states == 0 && cur->expire <= time_uptime) {
1516                         pf_unlink_src_node_locked(cur);
1517                         LIST_INSERT_HEAD(&freelist, cur, entry);
1518                 } else if (cur->rule.ptr != NULL)
1519                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1520             PF_HASHROW_UNLOCK(sh);
1521         }
1522
1523         pf_free_src_nodes(&freelist);
1524
1525         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1526 }
1527
1528 static void
1529 pf_src_tree_remove_state(struct pf_state *s)
1530 {
1531         u_int32_t timeout;
1532
1533         if (s->src_node != NULL) {
1534                 if (s->src.tcp_est)
1535                         --s->src_node->conn;
1536                 if (--s->src_node->states == 0) {
1537                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1538                         if (!timeout)
1539                                 timeout =
1540                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1541                         s->src_node->expire = time_uptime + timeout;
1542                 }
1543         }
1544         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1545                 if (--s->nat_src_node->states == 0) {
1546                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
1547                         if (!timeout)
1548                                 timeout =
1549                                     V_pf_default_rule.timeout[PFTM_SRC_NODE];
1550                         s->nat_src_node->expire = time_uptime + timeout;
1551                 }
1552         }
1553         s->src_node = s->nat_src_node = NULL;
1554 }
1555
1556 /*
1557  * Unlink and potentilly free a state. Function may be
1558  * called with ID hash row locked, but always returns
1559  * unlocked, since it needs to go through key hash locking.
1560  */
1561 int
1562 pf_unlink_state(struct pf_state *s, u_int flags)
1563 {
1564         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1565
1566         if ((flags & PF_ENTER_LOCKED) == 0)
1567                 PF_HASHROW_LOCK(ih);
1568         else
1569                 PF_HASHROW_ASSERT(ih);
1570
1571         if (s->timeout == PFTM_UNLINKED) {
1572                 /*
1573                  * State is being processed
1574                  * by pf_unlink_state() in
1575                  * an other thread.
1576                  */
1577                 PF_HASHROW_UNLOCK(ih);
1578                 return (0);     /* XXXGL: undefined actually */
1579         }
1580
1581         if (s->src.state == PF_TCPS_PROXY_DST) {
1582                 /* XXX wire key the right one? */
1583                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1584                     &s->key[PF_SK_WIRE]->addr[1],
1585                     &s->key[PF_SK_WIRE]->addr[0],
1586                     s->key[PF_SK_WIRE]->port[1],
1587                     s->key[PF_SK_WIRE]->port[0],
1588                     s->src.seqhi, s->src.seqlo + 1,
1589                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1590         }
1591
1592         LIST_REMOVE(s, entry);
1593         pf_src_tree_remove_state(s);
1594
1595         if (pfsync_delete_state_ptr != NULL)
1596                 pfsync_delete_state_ptr(s);
1597
1598         STATE_DEC_COUNTERS(s);
1599
1600         s->timeout = PFTM_UNLINKED;
1601
1602         PF_HASHROW_UNLOCK(ih);
1603
1604         pf_detach_state(s);
1605         refcount_release(&s->refs);
1606
1607         return (pf_release_state(s));
1608 }
1609
1610 void
1611 pf_free_state(struct pf_state *cur)
1612 {
1613
1614         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1615         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1616             cur->timeout));
1617
1618         pf_normalize_tcp_cleanup(cur);
1619         uma_zfree(V_pf_state_z, cur);
1620         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1621 }
1622
1623 /*
1624  * Called only from pf_purge_thread(), thus serialized.
1625  */
1626 static u_int
1627 pf_purge_expired_states(u_int i, int maxcheck)
1628 {
1629         struct pf_idhash *ih;
1630         struct pf_state *s;
1631
1632         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1633
1634         /*
1635          * Go through hash and unlink states that expire now.
1636          */
1637         while (maxcheck > 0) {
1638
1639                 ih = &V_pf_idhash[i];
1640 relock:
1641                 PF_HASHROW_LOCK(ih);
1642                 LIST_FOREACH(s, &ih->states, entry) {
1643                         if (pf_state_expires(s) <= time_uptime) {
1644                                 V_pf_status.states -=
1645                                     pf_unlink_state(s, PF_ENTER_LOCKED);
1646                                 goto relock;
1647                         }
1648                         s->rule.ptr->rule_flag |= PFRULE_REFS;
1649                         if (s->nat_rule.ptr != NULL)
1650                                 s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1651                         if (s->anchor.ptr != NULL)
1652                                 s->anchor.ptr->rule_flag |= PFRULE_REFS;
1653                         s->kif->pfik_flags |= PFI_IFLAG_REFS;
1654                         if (s->rt_kif)
1655                                 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1656                 }
1657                 PF_HASHROW_UNLOCK(ih);
1658
1659                 /* Return when we hit end of hash. */
1660                 if (++i > V_pf_hashmask) {
1661                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1662                         return (0);
1663                 }
1664
1665                 maxcheck--;
1666         }
1667
1668         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1669
1670         return (i);
1671 }
1672
1673 static void
1674 pf_purge_unlinked_rules()
1675 {
1676         struct pf_rulequeue tmpq;
1677         struct pf_rule *r, *r1;
1678
1679         /*
1680          * If we have overloading task pending, then we'd
1681          * better skip purging this time. There is a tiny
1682          * probability that overloading task references
1683          * an already unlinked rule.
1684          */
1685         PF_OVERLOADQ_LOCK();
1686         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1687                 PF_OVERLOADQ_UNLOCK();
1688                 return;
1689         }
1690         PF_OVERLOADQ_UNLOCK();
1691
1692         /*
1693          * Do naive mark-and-sweep garbage collecting of old rules.
1694          * Reference flag is raised by pf_purge_expired_states()
1695          * and pf_purge_expired_src_nodes().
1696          *
1697          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1698          * use a temporary queue.
1699          */
1700         TAILQ_INIT(&tmpq);
1701         PF_UNLNKDRULES_LOCK();
1702         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1703                 if (!(r->rule_flag & PFRULE_REFS)) {
1704                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1705                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1706                 } else
1707                         r->rule_flag &= ~PFRULE_REFS;
1708         }
1709         PF_UNLNKDRULES_UNLOCK();
1710
1711         if (!TAILQ_EMPTY(&tmpq)) {
1712                 PF_RULES_WLOCK();
1713                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1714                         TAILQ_REMOVE(&tmpq, r, entries);
1715                         pf_free_rule(r);
1716                 }
1717                 PF_RULES_WUNLOCK();
1718         }
1719 }
1720
1721 void
1722 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1723 {
1724         switch (af) {
1725 #ifdef INET
1726         case AF_INET: {
1727                 u_int32_t a = ntohl(addr->addr32[0]);
1728                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1729                     (a>>8)&255, a&255);
1730                 if (p) {
1731                         p = ntohs(p);
1732                         printf(":%u", p);
1733                 }
1734                 break;
1735         }
1736 #endif /* INET */
1737 #ifdef INET6
1738         case AF_INET6: {
1739                 u_int16_t b;
1740                 u_int8_t i, curstart, curend, maxstart, maxend;
1741                 curstart = curend = maxstart = maxend = 255;
1742                 for (i = 0; i < 8; i++) {
1743                         if (!addr->addr16[i]) {
1744                                 if (curstart == 255)
1745                                         curstart = i;
1746                                 curend = i;
1747                         } else {
1748                                 if ((curend - curstart) >
1749                                     (maxend - maxstart)) {
1750                                         maxstart = curstart;
1751                                         maxend = curend;
1752                                 }
1753                                 curstart = curend = 255;
1754                         }
1755                 }
1756                 if ((curend - curstart) >
1757                     (maxend - maxstart)) {
1758                         maxstart = curstart;
1759                         maxend = curend;
1760                 }
1761                 for (i = 0; i < 8; i++) {
1762                         if (i >= maxstart && i <= maxend) {
1763                                 if (i == 0)
1764                                         printf(":");
1765                                 if (i == maxend)
1766                                         printf(":");
1767                         } else {
1768                                 b = ntohs(addr->addr16[i]);
1769                                 printf("%x", b);
1770                                 if (i < 7)
1771                                         printf(":");
1772                         }
1773                 }
1774                 if (p) {
1775                         p = ntohs(p);
1776                         printf("[%u]", p);
1777                 }
1778                 break;
1779         }
1780 #endif /* INET6 */
1781         }
1782 }
1783
1784 void
1785 pf_print_state(struct pf_state *s)
1786 {
1787         pf_print_state_parts(s, NULL, NULL);
1788 }
1789
1790 static void
1791 pf_print_state_parts(struct pf_state *s,
1792     struct pf_state_key *skwp, struct pf_state_key *sksp)
1793 {
1794         struct pf_state_key *skw, *sks;
1795         u_int8_t proto, dir;
1796
1797         /* Do our best to fill these, but they're skipped if NULL */
1798         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1799         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1800         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1801         dir = s ? s->direction : 0;
1802
1803         switch (proto) {
1804         case IPPROTO_IPV4:
1805                 printf("IPv4");
1806                 break;
1807         case IPPROTO_IPV6:
1808                 printf("IPv6");
1809                 break;
1810         case IPPROTO_TCP:
1811                 printf("TCP");
1812                 break;
1813         case IPPROTO_UDP:
1814                 printf("UDP");
1815                 break;
1816         case IPPROTO_ICMP:
1817                 printf("ICMP");
1818                 break;
1819         case IPPROTO_ICMPV6:
1820                 printf("ICMPv6");
1821                 break;
1822         default:
1823                 printf("%u", skw->proto);
1824                 break;
1825         }
1826         switch (dir) {
1827         case PF_IN:
1828                 printf(" in");
1829                 break;
1830         case PF_OUT:
1831                 printf(" out");
1832                 break;
1833         }
1834         if (skw) {
1835                 printf(" wire: ");
1836                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1837                 printf(" ");
1838                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1839         }
1840         if (sks) {
1841                 printf(" stack: ");
1842                 if (sks != skw) {
1843                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1844                         printf(" ");
1845                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1846                 } else
1847                         printf("-");
1848         }
1849         if (s) {
1850                 if (proto == IPPROTO_TCP) {
1851                         printf(" [lo=%u high=%u win=%u modulator=%u",
1852                             s->src.seqlo, s->src.seqhi,
1853                             s->src.max_win, s->src.seqdiff);
1854                         if (s->src.wscale && s->dst.wscale)
1855                                 printf(" wscale=%u",
1856                                     s->src.wscale & PF_WSCALE_MASK);
1857                         printf("]");
1858                         printf(" [lo=%u high=%u win=%u modulator=%u",
1859                             s->dst.seqlo, s->dst.seqhi,
1860                             s->dst.max_win, s->dst.seqdiff);
1861                         if (s->src.wscale && s->dst.wscale)
1862                                 printf(" wscale=%u",
1863                                 s->dst.wscale & PF_WSCALE_MASK);
1864                         printf("]");
1865                 }
1866                 printf(" %u:%u", s->src.state, s->dst.state);
1867         }
1868 }
1869
1870 void
1871 pf_print_flags(u_int8_t f)
1872 {
1873         if (f)
1874                 printf(" ");
1875         if (f & TH_FIN)
1876                 printf("F");
1877         if (f & TH_SYN)
1878                 printf("S");
1879         if (f & TH_RST)
1880                 printf("R");
1881         if (f & TH_PUSH)
1882                 printf("P");
1883         if (f & TH_ACK)
1884                 printf("A");
1885         if (f & TH_URG)
1886                 printf("U");
1887         if (f & TH_ECE)
1888                 printf("E");
1889         if (f & TH_CWR)
1890                 printf("W");
1891 }
1892
1893 #define PF_SET_SKIP_STEPS(i)                                    \
1894         do {                                                    \
1895                 while (head[i] != cur) {                        \
1896                         head[i]->skip[i].ptr = cur;             \
1897                         head[i] = TAILQ_NEXT(head[i], entries); \
1898                 }                                               \
1899         } while (0)
1900
1901 void
1902 pf_calc_skip_steps(struct pf_rulequeue *rules)
1903 {
1904         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1905         int i;
1906
1907         cur = TAILQ_FIRST(rules);
1908         prev = cur;
1909         for (i = 0; i < PF_SKIP_COUNT; ++i)
1910                 head[i] = cur;
1911         while (cur != NULL) {
1912
1913                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1914                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1915                 if (cur->direction != prev->direction)
1916                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1917                 if (cur->af != prev->af)
1918                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
1919                 if (cur->proto != prev->proto)
1920                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
1921                 if (cur->src.neg != prev->src.neg ||
1922                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
1923                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
1924                 if (cur->src.port[0] != prev->src.port[0] ||
1925                     cur->src.port[1] != prev->src.port[1] ||
1926                     cur->src.port_op != prev->src.port_op)
1927                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
1928                 if (cur->dst.neg != prev->dst.neg ||
1929                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
1930                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
1931                 if (cur->dst.port[0] != prev->dst.port[0] ||
1932                     cur->dst.port[1] != prev->dst.port[1] ||
1933                     cur->dst.port_op != prev->dst.port_op)
1934                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
1935
1936                 prev = cur;
1937                 cur = TAILQ_NEXT(cur, entries);
1938         }
1939         for (i = 0; i < PF_SKIP_COUNT; ++i)
1940                 PF_SET_SKIP_STEPS(i);
1941 }
1942
1943 static int
1944 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
1945 {
1946         if (aw1->type != aw2->type)
1947                 return (1);
1948         switch (aw1->type) {
1949         case PF_ADDR_ADDRMASK:
1950         case PF_ADDR_RANGE:
1951                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
1952                         return (1);
1953                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
1954                         return (1);
1955                 return (0);
1956         case PF_ADDR_DYNIFTL:
1957                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
1958         case PF_ADDR_NOROUTE:
1959         case PF_ADDR_URPFFAILED:
1960                 return (0);
1961         case PF_ADDR_TABLE:
1962                 return (aw1->p.tbl != aw2->p.tbl);
1963         default:
1964                 printf("invalid address type: %d\n", aw1->type);
1965                 return (1);
1966         }
1967 }
1968
1969 /**
1970  * Checksum updates are a little complicated because the checksum in the TCP/UDP
1971  * header isn't always a full checksum. In some cases (i.e. output) it's a
1972  * pseudo-header checksum, which is a partial checksum over src/dst IP
1973  * addresses, protocol number and length.
1974  *
1975  * That means we have the following cases:
1976  *  * Input or forwarding: we don't have TSO, the checksum fields are full
1977  *      checksums, we need to update the checksum whenever we change anything.
1978  *  * Output (i.e. the checksum is a pseudo-header checksum):
1979  *      x The field being updated is src/dst address or affects the length of
1980  *      the packet. We need to update the pseudo-header checksum (note that this
1981  *      checksum is not ones' complement).
1982  *      x Some other field is being modified (e.g. src/dst port numbers): We
1983  *      don't have to update anything.
1984  **/
1985 u_int16_t
1986 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
1987 {
1988         u_int32_t       l;
1989
1990         if (udp && !cksum)
1991                 return (0x0000);
1992         l = cksum + old - new;
1993         l = (l >> 16) + (l & 65535);
1994         l = l & 65535;
1995         if (udp && !l)
1996                 return (0xFFFF);
1997         return (l);
1998 }
1999
2000 u_int16_t
2001 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2002         u_int16_t new, u_int8_t udp)
2003 {
2004         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2005                 return (cksum);
2006
2007         return (pf_cksum_fixup(cksum, old, new, udp));
2008 }
2009
2010 static void
2011 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2012         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2013         sa_family_t af)
2014 {
2015         struct pf_addr  ao;
2016         u_int16_t       po = *p;
2017
2018         PF_ACPY(&ao, a, af);
2019         PF_ACPY(a, an, af);
2020
2021         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2022                 *pc = ~*pc;
2023
2024         *p = pn;
2025
2026         switch (af) {
2027 #ifdef INET
2028         case AF_INET:
2029                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2030                     ao.addr16[0], an->addr16[0], 0),
2031                     ao.addr16[1], an->addr16[1], 0);
2032                 *p = pn;
2033
2034                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2035                     ao.addr16[0], an->addr16[0], u),
2036                     ao.addr16[1], an->addr16[1], u);
2037
2038                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2039                 break;
2040 #endif /* INET */
2041 #ifdef INET6
2042         case AF_INET6:
2043                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2044                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2045                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2046                     ao.addr16[0], an->addr16[0], u),
2047                     ao.addr16[1], an->addr16[1], u),
2048                     ao.addr16[2], an->addr16[2], u),
2049                     ao.addr16[3], an->addr16[3], u),
2050                     ao.addr16[4], an->addr16[4], u),
2051                     ao.addr16[5], an->addr16[5], u),
2052                     ao.addr16[6], an->addr16[6], u),
2053                     ao.addr16[7], an->addr16[7], u);
2054
2055                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2056                 break;
2057 #endif /* INET6 */
2058         }
2059
2060         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2061             CSUM_DELAY_DATA_IPV6)) {
2062                 *pc = ~*pc;
2063                 if (! *pc)
2064                         *pc = 0xffff;
2065         }
2066 }
2067
2068 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2069 void
2070 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2071 {
2072         u_int32_t       ao;
2073
2074         memcpy(&ao, a, sizeof(ao));
2075         memcpy(a, &an, sizeof(u_int32_t));
2076         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2077             ao % 65536, an % 65536, u);
2078 }
2079
2080 void
2081 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2082 {
2083         u_int32_t       ao;
2084
2085         memcpy(&ao, a, sizeof(ao));
2086         memcpy(a, &an, sizeof(u_int32_t));
2087
2088         *c = pf_proto_cksum_fixup(m,
2089             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2090             ao % 65536, an % 65536, udp);
2091 }
2092
2093 #ifdef INET6
2094 static void
2095 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2096 {
2097         struct pf_addr  ao;
2098
2099         PF_ACPY(&ao, a, AF_INET6);
2100         PF_ACPY(a, an, AF_INET6);
2101
2102         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2103             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2104             pf_cksum_fixup(pf_cksum_fixup(*c,
2105             ao.addr16[0], an->addr16[0], u),
2106             ao.addr16[1], an->addr16[1], u),
2107             ao.addr16[2], an->addr16[2], u),
2108             ao.addr16[3], an->addr16[3], u),
2109             ao.addr16[4], an->addr16[4], u),
2110             ao.addr16[5], an->addr16[5], u),
2111             ao.addr16[6], an->addr16[6], u),
2112             ao.addr16[7], an->addr16[7], u);
2113 }
2114 #endif /* INET6 */
2115
2116 static void
2117 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2118     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2119     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2120 {
2121         struct pf_addr  oia, ooa;
2122
2123         PF_ACPY(&oia, ia, af);
2124         if (oa)
2125                 PF_ACPY(&ooa, oa, af);
2126
2127         /* Change inner protocol port, fix inner protocol checksum. */
2128         if (ip != NULL) {
2129                 u_int16_t       oip = *ip;
2130                 u_int32_t       opc;
2131
2132                 if (pc != NULL)
2133                         opc = *pc;
2134                 *ip = np;
2135                 if (pc != NULL)
2136                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2137                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2138                 if (pc != NULL)
2139                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2140         }
2141         /* Change inner ip address, fix inner ip and icmp checksums. */
2142         PF_ACPY(ia, na, af);
2143         switch (af) {
2144 #ifdef INET
2145         case AF_INET: {
2146                 u_int32_t        oh2c = *h2c;
2147
2148                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2149                     oia.addr16[0], ia->addr16[0], 0),
2150                     oia.addr16[1], ia->addr16[1], 0);
2151                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2152                     oia.addr16[0], ia->addr16[0], 0),
2153                     oia.addr16[1], ia->addr16[1], 0);
2154                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2155                 break;
2156         }
2157 #endif /* INET */
2158 #ifdef INET6
2159         case AF_INET6:
2160                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2161                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2162                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2163                     oia.addr16[0], ia->addr16[0], u),
2164                     oia.addr16[1], ia->addr16[1], u),
2165                     oia.addr16[2], ia->addr16[2], u),
2166                     oia.addr16[3], ia->addr16[3], u),
2167                     oia.addr16[4], ia->addr16[4], u),
2168                     oia.addr16[5], ia->addr16[5], u),
2169                     oia.addr16[6], ia->addr16[6], u),
2170                     oia.addr16[7], ia->addr16[7], u);
2171                 break;
2172 #endif /* INET6 */
2173         }
2174         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2175         if (oa) {
2176                 PF_ACPY(oa, na, af);
2177                 switch (af) {
2178 #ifdef INET
2179                 case AF_INET:
2180                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2181                             ooa.addr16[0], oa->addr16[0], 0),
2182                             ooa.addr16[1], oa->addr16[1], 0);
2183                         break;
2184 #endif /* INET */
2185 #ifdef INET6
2186                 case AF_INET6:
2187                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2188                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2189                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2190                             ooa.addr16[0], oa->addr16[0], u),
2191                             ooa.addr16[1], oa->addr16[1], u),
2192                             ooa.addr16[2], oa->addr16[2], u),
2193                             ooa.addr16[3], oa->addr16[3], u),
2194                             ooa.addr16[4], oa->addr16[4], u),
2195                             ooa.addr16[5], oa->addr16[5], u),
2196                             ooa.addr16[6], oa->addr16[6], u),
2197                             ooa.addr16[7], oa->addr16[7], u);
2198                         break;
2199 #endif /* INET6 */
2200                 }
2201         }
2202 }
2203
2204
2205 /*
2206  * Need to modulate the sequence numbers in the TCP SACK option
2207  * (credits to Krzysztof Pfaff for report and patch)
2208  */
2209 static int
2210 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2211     struct tcphdr *th, struct pf_state_peer *dst)
2212 {
2213         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2214         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2215         int copyback = 0, i, olen;
2216         struct sackblk sack;
2217
2218 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2219         if (hlen < TCPOLEN_SACKLEN ||
2220             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2221                 return 0;
2222
2223         while (hlen >= TCPOLEN_SACKLEN) {
2224                 olen = opt[1];
2225                 switch (*opt) {
2226                 case TCPOPT_EOL:        /* FALLTHROUGH */
2227                 case TCPOPT_NOP:
2228                         opt++;
2229                         hlen--;
2230                         break;
2231                 case TCPOPT_SACK:
2232                         if (olen > hlen)
2233                                 olen = hlen;
2234                         if (olen >= TCPOLEN_SACKLEN) {
2235                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2236                                     i += TCPOLEN_SACK) {
2237                                         memcpy(&sack, &opt[i], sizeof(sack));
2238                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2239                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2240                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2241                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2242                                         memcpy(&opt[i], &sack, sizeof(sack));
2243                                 }
2244                                 copyback = 1;
2245                         }
2246                         /* FALLTHROUGH */
2247                 default:
2248                         if (olen < 2)
2249                                 olen = 2;
2250                         hlen -= olen;
2251                         opt += olen;
2252                 }
2253         }
2254
2255         if (copyback)
2256                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2257         return (copyback);
2258 }
2259
2260 static void
2261 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2262     const struct pf_addr *saddr, const struct pf_addr *daddr,
2263     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2264     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2265     u_int16_t rtag, struct ifnet *ifp)
2266 {
2267         struct pf_send_entry *pfse;
2268         struct mbuf     *m;
2269         int              len, tlen;
2270 #ifdef INET
2271         struct ip       *h = NULL;
2272 #endif /* INET */
2273 #ifdef INET6
2274         struct ip6_hdr  *h6 = NULL;
2275 #endif /* INET6 */
2276         struct tcphdr   *th;
2277         char            *opt;
2278         struct pf_mtag  *pf_mtag;
2279
2280         len = 0;
2281         th = NULL;
2282
2283         /* maximum segment size tcp option */
2284         tlen = sizeof(struct tcphdr);
2285         if (mss)
2286                 tlen += 4;
2287
2288         switch (af) {
2289 #ifdef INET
2290         case AF_INET:
2291                 len = sizeof(struct ip) + tlen;
2292                 break;
2293 #endif /* INET */
2294 #ifdef INET6
2295         case AF_INET6:
2296                 len = sizeof(struct ip6_hdr) + tlen;
2297                 break;
2298 #endif /* INET6 */
2299         default:
2300                 panic("%s: unsupported af %d", __func__, af);
2301         }
2302
2303         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2304         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2305         if (pfse == NULL)
2306                 return;
2307         m = m_gethdr(M_NOWAIT, MT_DATA);
2308         if (m == NULL) {
2309                 free(pfse, M_PFTEMP);
2310                 return;
2311         }
2312 #ifdef MAC
2313         mac_netinet_firewall_send(m);
2314 #endif
2315         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2316                 free(pfse, M_PFTEMP);
2317                 m_freem(m);
2318                 return;
2319         }
2320         if (tag)
2321                 m->m_flags |= M_SKIP_FIREWALL;
2322         pf_mtag->tag = rtag;
2323
2324         if (r != NULL && r->rtableid >= 0)
2325                 M_SETFIB(m, r->rtableid);
2326
2327 #ifdef ALTQ
2328         if (r != NULL && r->qid) {
2329                 pf_mtag->qid = r->qid;
2330
2331                 /* add hints for ecn */
2332                 pf_mtag->hdr = mtod(m, struct ip *);
2333         }
2334 #endif /* ALTQ */
2335         m->m_data += max_linkhdr;
2336         m->m_pkthdr.len = m->m_len = len;
2337         m->m_pkthdr.rcvif = NULL;
2338         bzero(m->m_data, len);
2339         switch (af) {
2340 #ifdef INET
2341         case AF_INET:
2342                 h = mtod(m, struct ip *);
2343
2344                 /* IP header fields included in the TCP checksum */
2345                 h->ip_p = IPPROTO_TCP;
2346                 h->ip_len = htons(tlen);
2347                 h->ip_src.s_addr = saddr->v4.s_addr;
2348                 h->ip_dst.s_addr = daddr->v4.s_addr;
2349
2350                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2351                 break;
2352 #endif /* INET */
2353 #ifdef INET6
2354         case AF_INET6:
2355                 h6 = mtod(m, struct ip6_hdr *);
2356
2357                 /* IP header fields included in the TCP checksum */
2358                 h6->ip6_nxt = IPPROTO_TCP;
2359                 h6->ip6_plen = htons(tlen);
2360                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2361                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2362
2363                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2364                 break;
2365 #endif /* INET6 */
2366         }
2367
2368         /* TCP header */
2369         th->th_sport = sport;
2370         th->th_dport = dport;
2371         th->th_seq = htonl(seq);
2372         th->th_ack = htonl(ack);
2373         th->th_off = tlen >> 2;
2374         th->th_flags = flags;
2375         th->th_win = htons(win);
2376
2377         if (mss) {
2378                 opt = (char *)(th + 1);
2379                 opt[0] = TCPOPT_MAXSEG;
2380                 opt[1] = 4;
2381                 HTONS(mss);
2382                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2383         }
2384
2385         switch (af) {
2386 #ifdef INET
2387         case AF_INET:
2388                 /* TCP checksum */
2389                 th->th_sum = in_cksum(m, len);
2390
2391                 /* Finish the IP header */
2392                 h->ip_v = 4;
2393                 h->ip_hl = sizeof(*h) >> 2;
2394                 h->ip_tos = IPTOS_LOWDELAY;
2395                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2396                 h->ip_len = htons(len);
2397                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2398                 h->ip_sum = 0;
2399
2400                 pfse->pfse_type = PFSE_IP;
2401                 break;
2402 #endif /* INET */
2403 #ifdef INET6
2404         case AF_INET6:
2405                 /* TCP checksum */
2406                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2407                     sizeof(struct ip6_hdr), tlen);
2408
2409                 h6->ip6_vfc |= IPV6_VERSION;
2410                 h6->ip6_hlim = IPV6_DEFHLIM;
2411
2412                 pfse->pfse_type = PFSE_IP6;
2413                 break;
2414 #endif /* INET6 */
2415         }
2416         pfse->pfse_m = m;
2417         pf_send(pfse);
2418 }
2419
2420 static void
2421 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2422     struct pf_rule *r)
2423 {
2424         struct pf_send_entry *pfse;
2425         struct mbuf *m0;
2426         struct pf_mtag *pf_mtag;
2427
2428         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2429         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2430         if (pfse == NULL)
2431                 return;
2432
2433         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2434                 free(pfse, M_PFTEMP);
2435                 return;
2436         }
2437
2438         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2439                 free(pfse, M_PFTEMP);
2440                 return;
2441         }
2442         /* XXX: revisit */
2443         m0->m_flags |= M_SKIP_FIREWALL;
2444
2445         if (r->rtableid >= 0)
2446                 M_SETFIB(m0, r->rtableid);
2447
2448 #ifdef ALTQ
2449         if (r->qid) {
2450                 pf_mtag->qid = r->qid;
2451                 /* add hints for ecn */
2452                 pf_mtag->hdr = mtod(m0, struct ip *);
2453         }
2454 #endif /* ALTQ */
2455
2456         switch (af) {
2457 #ifdef INET
2458         case AF_INET:
2459                 pfse->pfse_type = PFSE_ICMP;
2460                 break;
2461 #endif /* INET */
2462 #ifdef INET6
2463         case AF_INET6:
2464                 pfse->pfse_type = PFSE_ICMP6;
2465                 break;
2466 #endif /* INET6 */
2467         }
2468         pfse->pfse_m = m0;
2469         pfse->pfse_icmp_type = type;
2470         pfse->pfse_icmp_code = code;
2471         pf_send(pfse);
2472 }
2473
2474 /*
2475  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2476  * If n is 0, they match if they are equal. If n is != 0, they match if they
2477  * are different.
2478  */
2479 int
2480 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2481     struct pf_addr *b, sa_family_t af)
2482 {
2483         int     match = 0;
2484
2485         switch (af) {
2486 #ifdef INET
2487         case AF_INET:
2488                 if ((a->addr32[0] & m->addr32[0]) ==
2489                     (b->addr32[0] & m->addr32[0]))
2490                         match++;
2491                 break;
2492 #endif /* INET */
2493 #ifdef INET6
2494         case AF_INET6:
2495                 if (((a->addr32[0] & m->addr32[0]) ==
2496                      (b->addr32[0] & m->addr32[0])) &&
2497                     ((a->addr32[1] & m->addr32[1]) ==
2498                      (b->addr32[1] & m->addr32[1])) &&
2499                     ((a->addr32[2] & m->addr32[2]) ==
2500                      (b->addr32[2] & m->addr32[2])) &&
2501                     ((a->addr32[3] & m->addr32[3]) ==
2502                      (b->addr32[3] & m->addr32[3])))
2503                         match++;
2504                 break;
2505 #endif /* INET6 */
2506         }
2507         if (match) {
2508                 if (n)
2509                         return (0);
2510                 else
2511                         return (1);
2512         } else {
2513                 if (n)
2514                         return (1);
2515                 else
2516                         return (0);
2517         }
2518 }
2519
2520 /*
2521  * Return 1 if b <= a <= e, otherwise return 0.
2522  */
2523 int
2524 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2525     struct pf_addr *a, sa_family_t af)
2526 {
2527         switch (af) {
2528 #ifdef INET
2529         case AF_INET:
2530                 if ((a->addr32[0] < b->addr32[0]) ||
2531                     (a->addr32[0] > e->addr32[0]))
2532                         return (0);
2533                 break;
2534 #endif /* INET */
2535 #ifdef INET6
2536         case AF_INET6: {
2537                 int     i;
2538
2539                 /* check a >= b */
2540                 for (i = 0; i < 4; ++i)
2541                         if (a->addr32[i] > b->addr32[i])
2542                                 break;
2543                         else if (a->addr32[i] < b->addr32[i])
2544                                 return (0);
2545                 /* check a <= e */
2546                 for (i = 0; i < 4; ++i)
2547                         if (a->addr32[i] < e->addr32[i])
2548                                 break;
2549                         else if (a->addr32[i] > e->addr32[i])
2550                                 return (0);
2551                 break;
2552         }
2553 #endif /* INET6 */
2554         }
2555         return (1);
2556 }
2557
2558 static int
2559 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2560 {
2561         switch (op) {
2562         case PF_OP_IRG:
2563                 return ((p > a1) && (p < a2));
2564         case PF_OP_XRG:
2565                 return ((p < a1) || (p > a2));
2566         case PF_OP_RRG:
2567                 return ((p >= a1) && (p <= a2));
2568         case PF_OP_EQ:
2569                 return (p == a1);
2570         case PF_OP_NE:
2571                 return (p != a1);
2572         case PF_OP_LT:
2573                 return (p < a1);
2574         case PF_OP_LE:
2575                 return (p <= a1);
2576         case PF_OP_GT:
2577                 return (p > a1);
2578         case PF_OP_GE:
2579                 return (p >= a1);
2580         }
2581         return (0); /* never reached */
2582 }
2583
2584 int
2585 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2586 {
2587         NTOHS(a1);
2588         NTOHS(a2);
2589         NTOHS(p);
2590         return (pf_match(op, a1, a2, p));
2591 }
2592
2593 static int
2594 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2595 {
2596         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2597                 return (0);
2598         return (pf_match(op, a1, a2, u));
2599 }
2600
2601 static int
2602 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2603 {
2604         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2605                 return (0);
2606         return (pf_match(op, a1, a2, g));
2607 }
2608
2609 int
2610 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2611 {
2612         if (*tag == -1)
2613                 *tag = mtag;
2614
2615         return ((!r->match_tag_not && r->match_tag == *tag) ||
2616             (r->match_tag_not && r->match_tag != *tag));
2617 }
2618
2619 int
2620 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2621 {
2622
2623         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2624
2625         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2626                 return (ENOMEM);
2627
2628         pd->pf_mtag->tag = tag;
2629
2630         return (0);
2631 }
2632
2633 #define PF_ANCHOR_STACKSIZE     32
2634 struct pf_anchor_stackframe {
2635         struct pf_ruleset       *rs;
2636         struct pf_rule          *r;     /* XXX: + match bit */
2637         struct pf_anchor        *child;
2638 };
2639
2640 /*
2641  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2642  */
2643 #define PF_ANCHORSTACK_MATCH    0x00000001
2644 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2645
2646 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2647 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2648                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2649 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2650                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2651 } while (0)
2652
2653 void
2654 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2655     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2656     int *match)
2657 {
2658         struct pf_anchor_stackframe     *f;
2659
2660         PF_RULES_RASSERT();
2661
2662         if (match)
2663                 *match = 0;
2664         if (*depth >= PF_ANCHOR_STACKSIZE) {
2665                 printf("%s: anchor stack overflow on %s\n",
2666                     __func__, (*r)->anchor->name);
2667                 *r = TAILQ_NEXT(*r, entries);
2668                 return;
2669         } else if (*depth == 0 && a != NULL)
2670                 *a = *r;
2671         f = stack + (*depth)++;
2672         f->rs = *rs;
2673         f->r = *r;
2674         if ((*r)->anchor_wildcard) {
2675                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2676
2677                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2678                         *r = NULL;
2679                         return;
2680                 }
2681                 *rs = &f->child->ruleset;
2682         } else {
2683                 f->child = NULL;
2684                 *rs = &(*r)->anchor->ruleset;
2685         }
2686         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2687 }
2688
2689 int
2690 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2691     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2692     int *match)
2693 {
2694         struct pf_anchor_stackframe     *f;
2695         struct pf_rule *fr;
2696         int quick = 0;
2697
2698         PF_RULES_RASSERT();
2699
2700         do {
2701                 if (*depth <= 0)
2702                         break;
2703                 f = stack + *depth - 1;
2704                 fr = PF_ANCHOR_RULE(f);
2705                 if (f->child != NULL) {
2706                         struct pf_anchor_node *parent;
2707
2708                         /*
2709                          * This block traverses through
2710                          * a wildcard anchor.
2711                          */
2712                         parent = &fr->anchor->children;
2713                         if (match != NULL && *match) {
2714                                 /*
2715                                  * If any of "*" matched, then
2716                                  * "foo/ *" matched, mark frame
2717                                  * appropriately.
2718                                  */
2719                                 PF_ANCHOR_SET_MATCH(f);
2720                                 *match = 0;
2721                         }
2722                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2723                         if (f->child != NULL) {
2724                                 *rs = &f->child->ruleset;
2725                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2726                                 if (*r == NULL)
2727                                         continue;
2728                                 else
2729                                         break;
2730                         }
2731                 }
2732                 (*depth)--;
2733                 if (*depth == 0 && a != NULL)
2734                         *a = NULL;
2735                 *rs = f->rs;
2736                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2737                         quick = fr->quick;
2738                 *r = TAILQ_NEXT(fr, entries);
2739         } while (*r == NULL);
2740
2741         return (quick);
2742 }
2743
2744 #ifdef INET6
2745 void
2746 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2747     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2748 {
2749         switch (af) {
2750 #ifdef INET
2751         case AF_INET:
2752                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2753                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2754                 break;
2755 #endif /* INET */
2756         case AF_INET6:
2757                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2758                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2759                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2760                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2761                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2762                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2763                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2764                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2765                 break;
2766         }
2767 }
2768
2769 void
2770 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2771 {
2772         switch (af) {
2773 #ifdef INET
2774         case AF_INET:
2775                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2776                 break;
2777 #endif /* INET */
2778         case AF_INET6:
2779                 if (addr->addr32[3] == 0xffffffff) {
2780                         addr->addr32[3] = 0;
2781                         if (addr->addr32[2] == 0xffffffff) {
2782                                 addr->addr32[2] = 0;
2783                                 if (addr->addr32[1] == 0xffffffff) {
2784                                         addr->addr32[1] = 0;
2785                                         addr->addr32[0] =
2786                                             htonl(ntohl(addr->addr32[0]) + 1);
2787                                 } else
2788                                         addr->addr32[1] =
2789                                             htonl(ntohl(addr->addr32[1]) + 1);
2790                         } else
2791                                 addr->addr32[2] =
2792                                     htonl(ntohl(addr->addr32[2]) + 1);
2793                 } else
2794                         addr->addr32[3] =
2795                             htonl(ntohl(addr->addr32[3]) + 1);
2796                 break;
2797         }
2798 }
2799 #endif /* INET6 */
2800
2801 int
2802 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
2803 {
2804         struct pf_addr          *saddr, *daddr;
2805         u_int16_t                sport, dport;
2806         struct inpcbinfo        *pi;
2807         struct inpcb            *inp;
2808
2809         pd->lookup.uid = UID_MAX;
2810         pd->lookup.gid = GID_MAX;
2811
2812         switch (pd->proto) {
2813         case IPPROTO_TCP:
2814                 if (pd->hdr.tcp == NULL)
2815                         return (-1);
2816                 sport = pd->hdr.tcp->th_sport;
2817                 dport = pd->hdr.tcp->th_dport;
2818                 pi = &V_tcbinfo;
2819                 break;
2820         case IPPROTO_UDP:
2821                 if (pd->hdr.udp == NULL)
2822                         return (-1);
2823                 sport = pd->hdr.udp->uh_sport;
2824                 dport = pd->hdr.udp->uh_dport;
2825                 pi = &V_udbinfo;
2826                 break;
2827         default:
2828                 return (-1);
2829         }
2830         if (direction == PF_IN) {
2831                 saddr = pd->src;
2832                 daddr = pd->dst;
2833         } else {
2834                 u_int16_t       p;
2835
2836                 p = sport;
2837                 sport = dport;
2838                 dport = p;
2839                 saddr = pd->dst;
2840                 daddr = pd->src;
2841         }
2842         switch (pd->af) {
2843 #ifdef INET
2844         case AF_INET:
2845                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
2846                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2847                 if (inp == NULL) {
2848                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
2849                            daddr->v4, dport, INPLOOKUP_WILDCARD |
2850                            INPLOOKUP_RLOCKPCB, NULL, m);
2851                         if (inp == NULL)
2852                                 return (-1);
2853                 }
2854                 break;
2855 #endif /* INET */
2856 #ifdef INET6
2857         case AF_INET6:
2858                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
2859                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2860                 if (inp == NULL) {
2861                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
2862                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
2863                             INPLOOKUP_RLOCKPCB, NULL, m);
2864                         if (inp == NULL)
2865                                 return (-1);
2866                 }
2867                 break;
2868 #endif /* INET6 */
2869
2870         default:
2871                 return (-1);
2872         }
2873         INP_RLOCK_ASSERT(inp);
2874         pd->lookup.uid = inp->inp_cred->cr_uid;
2875         pd->lookup.gid = inp->inp_cred->cr_groups[0];
2876         INP_RUNLOCK(inp);
2877
2878         return (1);
2879 }
2880
2881 static u_int8_t
2882 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2883 {
2884         int              hlen;
2885         u_int8_t         hdr[60];
2886         u_int8_t        *opt, optlen;
2887         u_int8_t         wscale = 0;
2888
2889         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
2890         if (hlen <= sizeof(struct tcphdr))
2891                 return (0);
2892         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2893                 return (0);
2894         opt = hdr + sizeof(struct tcphdr);
2895         hlen -= sizeof(struct tcphdr);
2896         while (hlen >= 3) {
2897                 switch (*opt) {
2898                 case TCPOPT_EOL:
2899                 case TCPOPT_NOP:
2900                         ++opt;
2901                         --hlen;
2902                         break;
2903                 case TCPOPT_WINDOW:
2904                         wscale = opt[2];
2905                         if (wscale > TCP_MAX_WINSHIFT)
2906                                 wscale = TCP_MAX_WINSHIFT;
2907                         wscale |= PF_WSCALE_FLAG;
2908                         /* FALLTHROUGH */
2909                 default:
2910                         optlen = opt[1];
2911                         if (optlen < 2)
2912                                 optlen = 2;
2913                         hlen -= optlen;
2914                         opt += optlen;
2915                         break;
2916                 }
2917         }
2918         return (wscale);
2919 }
2920
2921 static u_int16_t
2922 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
2923 {
2924         int              hlen;
2925         u_int8_t         hdr[60];
2926         u_int8_t        *opt, optlen;
2927         u_int16_t        mss = V_tcp_mssdflt;
2928
2929         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
2930         if (hlen <= sizeof(struct tcphdr))
2931                 return (0);
2932         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
2933                 return (0);
2934         opt = hdr + sizeof(struct tcphdr);
2935         hlen -= sizeof(struct tcphdr);
2936         while (hlen >= TCPOLEN_MAXSEG) {
2937                 switch (*opt) {
2938                 case TCPOPT_EOL:
2939                 case TCPOPT_NOP:
2940                         ++opt;
2941                         --hlen;
2942                         break;
2943                 case TCPOPT_MAXSEG:
2944                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
2945                         NTOHS(mss);
2946                         /* FALLTHROUGH */
2947                 default:
2948                         optlen = opt[1];
2949                         if (optlen < 2)
2950                                 optlen = 2;
2951                         hlen -= optlen;
2952                         opt += optlen;
2953                         break;
2954                 }
2955         }
2956         return (mss);
2957 }
2958
2959 static u_int16_t
2960 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
2961 {
2962 #ifdef INET
2963         struct sockaddr_in      *dst;
2964         struct route             ro;
2965 #endif /* INET */
2966 #ifdef INET6
2967         struct sockaddr_in6     *dst6;
2968         struct route_in6         ro6;
2969 #endif /* INET6 */
2970         struct rtentry          *rt = NULL;
2971         int                      hlen = 0;
2972         u_int16_t                mss = V_tcp_mssdflt;
2973
2974         switch (af) {
2975 #ifdef INET
2976         case AF_INET:
2977                 hlen = sizeof(struct ip);
2978                 bzero(&ro, sizeof(ro));
2979                 dst = (struct sockaddr_in *)&ro.ro_dst;
2980                 dst->sin_family = AF_INET;
2981                 dst->sin_len = sizeof(*dst);
2982                 dst->sin_addr = addr->v4;
2983                 in_rtalloc_ign(&ro, 0, rtableid);
2984                 rt = ro.ro_rt;
2985                 break;
2986 #endif /* INET */
2987 #ifdef INET6
2988         case AF_INET6:
2989                 hlen = sizeof(struct ip6_hdr);
2990                 bzero(&ro6, sizeof(ro6));
2991                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
2992                 dst6->sin6_family = AF_INET6;
2993                 dst6->sin6_len = sizeof(*dst6);
2994                 dst6->sin6_addr = addr->v6;
2995                 in6_rtalloc_ign(&ro6, 0, rtableid);
2996                 rt = ro6.ro_rt;
2997                 break;
2998 #endif /* INET6 */
2999         }
3000
3001         if (rt && rt->rt_ifp) {
3002                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
3003                 mss = max(V_tcp_mssdflt, mss);
3004                 RTFREE(rt);
3005         }
3006         mss = min(mss, offer);
3007         mss = max(mss, 64);             /* sanity - at least max opt space */
3008         return (mss);
3009 }
3010
3011 static u_int32_t
3012 pf_tcp_iss(struct pf_pdesc *pd)
3013 {
3014         MD5_CTX ctx;
3015         u_int32_t digest[4];
3016
3017         if (V_pf_tcp_secret_init == 0) {
3018                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3019                 MD5Init(&V_pf_tcp_secret_ctx);
3020                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3021                     sizeof(V_pf_tcp_secret));
3022                 V_pf_tcp_secret_init = 1;
3023         }
3024
3025         ctx = V_pf_tcp_secret_ctx;
3026
3027         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3028         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3029         if (pd->af == AF_INET6) {
3030                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3031                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3032         } else {
3033                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3034                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3035         }
3036         MD5Final((u_char *)digest, &ctx);
3037         V_pf_tcp_iss_off += 4096;
3038 #define ISN_RANDOM_INCREMENT (4096 - 1)
3039         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3040             V_pf_tcp_iss_off);
3041 #undef  ISN_RANDOM_INCREMENT
3042 }
3043
3044 static int
3045 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3046     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3047     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3048 {
3049         struct pf_rule          *nr = NULL;
3050         struct pf_addr          * const saddr = pd->src;
3051         struct pf_addr          * const daddr = pd->dst;
3052         sa_family_t              af = pd->af;
3053         struct pf_rule          *r, *a = NULL;
3054         struct pf_ruleset       *ruleset = NULL;
3055         struct pf_src_node      *nsn = NULL;
3056         struct tcphdr           *th = pd->hdr.tcp;
3057         struct pf_state_key     *sk = NULL, *nk = NULL;
3058         u_short                  reason;
3059         int                      rewrite = 0, hdrlen = 0;
3060         int                      tag = -1, rtableid = -1;
3061         int                      asd = 0;
3062         int                      match = 0;
3063         int                      state_icmp = 0;
3064         u_int16_t                sport = 0, dport = 0;
3065         u_int16_t                bproto_sum = 0, bip_sum = 0;
3066         u_int8_t                 icmptype = 0, icmpcode = 0;
3067         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3068
3069         PF_RULES_RASSERT();
3070
3071         if (inp != NULL) {
3072                 INP_LOCK_ASSERT(inp);
3073                 pd->lookup.uid = inp->inp_cred->cr_uid;
3074                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3075                 pd->lookup.done = 1;
3076         }
3077
3078         switch (pd->proto) {
3079         case IPPROTO_TCP:
3080                 sport = th->th_sport;
3081                 dport = th->th_dport;
3082                 hdrlen = sizeof(*th);
3083                 break;
3084         case IPPROTO_UDP:
3085                 sport = pd->hdr.udp->uh_sport;
3086                 dport = pd->hdr.udp->uh_dport;
3087                 hdrlen = sizeof(*pd->hdr.udp);
3088                 break;
3089 #ifdef INET
3090         case IPPROTO_ICMP:
3091                 if (pd->af != AF_INET)
3092                         break;
3093                 sport = dport = pd->hdr.icmp->icmp_id;
3094                 hdrlen = sizeof(*pd->hdr.icmp);
3095                 icmptype = pd->hdr.icmp->icmp_type;
3096                 icmpcode = pd->hdr.icmp->icmp_code;
3097
3098                 if (icmptype == ICMP_UNREACH ||
3099                     icmptype == ICMP_SOURCEQUENCH ||
3100                     icmptype == ICMP_REDIRECT ||
3101                     icmptype == ICMP_TIMXCEED ||
3102                     icmptype == ICMP_PARAMPROB)
3103                         state_icmp++;
3104                 break;
3105 #endif /* INET */
3106 #ifdef INET6
3107         case IPPROTO_ICMPV6:
3108                 if (af != AF_INET6)
3109                         break;
3110                 sport = dport = pd->hdr.icmp6->icmp6_id;
3111                 hdrlen = sizeof(*pd->hdr.icmp6);
3112                 icmptype = pd->hdr.icmp6->icmp6_type;
3113                 icmpcode = pd->hdr.icmp6->icmp6_code;
3114
3115                 if (icmptype == ICMP6_DST_UNREACH ||
3116                     icmptype == ICMP6_PACKET_TOO_BIG ||
3117                     icmptype == ICMP6_TIME_EXCEEDED ||
3118                     icmptype == ICMP6_PARAM_PROB)
3119                         state_icmp++;
3120                 break;
3121 #endif /* INET6 */
3122         default:
3123                 sport = dport = hdrlen = 0;
3124                 break;
3125         }
3126
3127         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3128
3129         /* check packet for BINAT/NAT/RDR */
3130         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3131             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3132                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3133                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3134
3135                 if (pd->ip_sum)
3136                         bip_sum = *pd->ip_sum;
3137
3138                 switch (pd->proto) {
3139                 case IPPROTO_TCP:
3140                         bproto_sum = th->th_sum;
3141                         pd->proto_sum = &th->th_sum;
3142
3143                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3144                             nk->port[pd->sidx] != sport) {
3145                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3146                                     &th->th_sum, &nk->addr[pd->sidx],
3147                                     nk->port[pd->sidx], 0, af);
3148                                 pd->sport = &th->th_sport;
3149                                 sport = th->th_sport;
3150                         }
3151
3152                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3153                             nk->port[pd->didx] != dport) {
3154                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3155                                     &th->th_sum, &nk->addr[pd->didx],
3156                                     nk->port[pd->didx], 0, af);
3157                                 dport = th->th_dport;
3158                                 pd->dport = &th->th_dport;
3159                         }
3160                         rewrite++;
3161                         break;
3162                 case IPPROTO_UDP:
3163                         bproto_sum = pd->hdr.udp->uh_sum;
3164                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3165
3166                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3167                             nk->port[pd->sidx] != sport) {
3168                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3169                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3170                                     &nk->addr[pd->sidx],
3171                                     nk->port[pd->sidx], 1, af);
3172                                 sport = pd->hdr.udp->uh_sport;
3173                                 pd->sport = &pd->hdr.udp->uh_sport;
3174                         }
3175
3176                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3177                             nk->port[pd->didx] != dport) {
3178                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3179                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3180                                     &nk->addr[pd->didx],
3181                                     nk->port[pd->didx], 1, af);
3182                                 dport = pd->hdr.udp->uh_dport;
3183                                 pd->dport = &pd->hdr.udp->uh_dport;
3184                         }
3185                         rewrite++;
3186                         break;
3187 #ifdef INET
3188                 case IPPROTO_ICMP:
3189                         nk->port[0] = nk->port[1];
3190                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3191                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3192                                     nk->addr[pd->sidx].v4.s_addr, 0);
3193
3194                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3195                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3196                                     nk->addr[pd->didx].v4.s_addr, 0);
3197
3198                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3199                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3200                                     pd->hdr.icmp->icmp_cksum, sport,
3201                                     nk->port[1], 0);
3202                                 pd->hdr.icmp->icmp_id = nk->port[1];
3203                                 pd->sport = &pd->hdr.icmp->icmp_id;
3204                         }
3205                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3206                         break;
3207 #endif /* INET */
3208 #ifdef INET6
3209                 case IPPROTO_ICMPV6:
3210                         nk->port[0] = nk->port[1];
3211                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3212                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3213                                     &nk->addr[pd->sidx], 0);
3214
3215                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3216                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3217                                     &nk->addr[pd->didx], 0);
3218                         rewrite++;
3219                         break;
3220 #endif /* INET */
3221                 default:
3222                         switch (af) {
3223 #ifdef INET
3224                         case AF_INET:
3225                                 if (PF_ANEQ(saddr,
3226                                     &nk->addr[pd->sidx], AF_INET))
3227                                         pf_change_a(&saddr->v4.s_addr,
3228                                             pd->ip_sum,
3229                                             nk->addr[pd->sidx].v4.s_addr, 0);
3230
3231                                 if (PF_ANEQ(daddr,
3232                                     &nk->addr[pd->didx], AF_INET))
3233                                         pf_change_a(&daddr->v4.s_addr,
3234                                             pd->ip_sum,
3235                                             nk->addr[pd->didx].v4.s_addr, 0);
3236                                 break;
3237 #endif /* INET */
3238 #ifdef INET6
3239                         case AF_INET6:
3240                                 if (PF_ANEQ(saddr,
3241                                     &nk->addr[pd->sidx], AF_INET6))
3242                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3243
3244                                 if (PF_ANEQ(daddr,
3245                                     &nk->addr[pd->didx], AF_INET6))
3246                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3247                                 break;
3248 #endif /* INET */
3249                         }
3250                         break;
3251                 }
3252                 if (nr->natpass)
3253                         r = NULL;
3254                 pd->nat_rule = nr;
3255         }
3256
3257         while (r != NULL) {
3258                 r->evaluations++;
3259                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3260                         r = r->skip[PF_SKIP_IFP].ptr;
3261                 else if (r->direction && r->direction != direction)
3262                         r = r->skip[PF_SKIP_DIR].ptr;
3263                 else if (r->af && r->af != af)
3264                         r = r->skip[PF_SKIP_AF].ptr;
3265                 else if (r->proto && r->proto != pd->proto)
3266                         r = r->skip[PF_SKIP_PROTO].ptr;
3267                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3268                     r->src.neg, kif, M_GETFIB(m)))
3269                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3270                 /* tcp/udp only. port_op always 0 in other cases */
3271                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3272                     r->src.port[0], r->src.port[1], sport))
3273                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3274                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3275                     r->dst.neg, NULL, M_GETFIB(m)))
3276                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3277                 /* tcp/udp only. port_op always 0 in other cases */
3278                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3279                     r->dst.port[0], r->dst.port[1], dport))
3280                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3281                 /* icmp only. type always 0 in other cases */
3282                 else if (r->type && r->type != icmptype + 1)
3283                         r = TAILQ_NEXT(r, entries);
3284                 /* icmp only. type always 0 in other cases */
3285                 else if (r->code && r->code != icmpcode + 1)
3286                         r = TAILQ_NEXT(r, entries);
3287                 else if (r->tos && !(r->tos == pd->tos))
3288                         r = TAILQ_NEXT(r, entries);
3289                 else if (r->rule_flag & PFRULE_FRAGMENT)
3290                         r = TAILQ_NEXT(r, entries);
3291                 else if (pd->proto == IPPROTO_TCP &&
3292                     (r->flagset & th->th_flags) != r->flags)
3293                         r = TAILQ_NEXT(r, entries);
3294                 /* tcp/udp only. uid.op always 0 in other cases */
3295                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3296                     pf_socket_lookup(direction, pd, m), 1)) &&
3297                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3298                     pd->lookup.uid))
3299                         r = TAILQ_NEXT(r, entries);
3300                 /* tcp/udp only. gid.op always 0 in other cases */
3301                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3302                     pf_socket_lookup(direction, pd, m), 1)) &&
3303                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3304                     pd->lookup.gid))
3305                         r = TAILQ_NEXT(r, entries);
3306                 else if (r->prob &&
3307                     r->prob <= arc4random())
3308                         r = TAILQ_NEXT(r, entries);
3309                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3310                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3311                         r = TAILQ_NEXT(r, entries);
3312                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3313                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3314                     pf_osfp_fingerprint(pd, m, off, th),
3315                     r->os_fingerprint)))
3316                         r = TAILQ_NEXT(r, entries);
3317                 else {
3318                         if (r->tag)
3319                                 tag = r->tag;
3320                         if (r->rtableid >= 0)
3321                                 rtableid = r->rtableid;
3322                         if (r->anchor == NULL) {
3323                                 match = 1;
3324                                 *rm = r;
3325                                 *am = a;
3326                                 *rsm = ruleset;
3327                                 if ((*rm)->quick)
3328                                         break;
3329                                 r = TAILQ_NEXT(r, entries);
3330                         } else
3331                                 pf_step_into_anchor(anchor_stack, &asd,
3332                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3333                                     &match);
3334                 }
3335                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3336                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3337                         break;
3338         }
3339         r = *rm;
3340         a = *am;
3341         ruleset = *rsm;
3342
3343         REASON_SET(&reason, PFRES_MATCH);
3344
3345         if (r->log || (nr != NULL && nr->log)) {
3346                 if (rewrite)
3347                         m_copyback(m, off, hdrlen, pd->hdr.any);
3348                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3349                     ruleset, pd, 1);
3350         }
3351
3352         if ((r->action == PF_DROP) &&
3353             ((r->rule_flag & PFRULE_RETURNRST) ||
3354             (r->rule_flag & PFRULE_RETURNICMP) ||
3355             (r->rule_flag & PFRULE_RETURN))) {
3356                 /* undo NAT changes, if they have taken place */
3357                 if (nr != NULL) {
3358                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3359                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3360                         if (pd->sport)
3361                                 *pd->sport = sk->port[pd->sidx];
3362                         if (pd->dport)
3363                                 *pd->dport = sk->port[pd->didx];
3364                         if (pd->proto_sum)
3365                                 *pd->proto_sum = bproto_sum;
3366                         if (pd->ip_sum)
3367                                 *pd->ip_sum = bip_sum;
3368                         m_copyback(m, off, hdrlen, pd->hdr.any);
3369                 }
3370                 if (pd->proto == IPPROTO_TCP &&
3371                     ((r->rule_flag & PFRULE_RETURNRST) ||
3372                     (r->rule_flag & PFRULE_RETURN)) &&
3373                     !(th->th_flags & TH_RST)) {
3374                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3375                         int              len = 0;
3376 #ifdef INET
3377                         struct ip       *h4;
3378 #endif
3379 #ifdef INET6
3380                         struct ip6_hdr  *h6;
3381 #endif
3382
3383                         switch (af) {
3384 #ifdef INET
3385                         case AF_INET:
3386                                 h4 = mtod(m, struct ip *);
3387                                 len = ntohs(h4->ip_len) - off;
3388                                 break;
3389 #endif
3390 #ifdef INET6
3391                         case AF_INET6:
3392                                 h6 = mtod(m, struct ip6_hdr *);
3393                                 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3394                                 break;
3395 #endif
3396                         }
3397
3398                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3399                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3400                         else {
3401                                 if (th->th_flags & TH_SYN)
3402                                         ack++;
3403                                 if (th->th_flags & TH_FIN)
3404                                         ack++;
3405                                 pf_send_tcp(m, r, af, pd->dst,
3406                                     pd->src, th->th_dport, th->th_sport,
3407                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3408                                     r->return_ttl, 1, 0, kif->pfik_ifp);
3409                         }
3410                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3411                     r->return_icmp)
3412                         pf_send_icmp(m, r->return_icmp >> 8,
3413                             r->return_icmp & 255, af, r);
3414                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3415                     r->return_icmp6)
3416                         pf_send_icmp(m, r->return_icmp6 >> 8,
3417                             r->return_icmp6 & 255, af, r);
3418         }
3419
3420         if (r->action == PF_DROP)
3421                 goto cleanup;
3422
3423         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3424                 REASON_SET(&reason, PFRES_MEMORY);
3425                 goto cleanup;
3426         }
3427         if (rtableid >= 0)
3428                 M_SETFIB(m, rtableid);
3429
3430         if (!state_icmp && (r->keep_state || nr != NULL ||
3431             (pd->flags & PFDESC_TCP_NORM))) {
3432                 int action;
3433                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3434                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3435                     hdrlen);
3436                 if (action != PF_PASS)
3437                         return (action);
3438         } else {
3439                 if (sk != NULL)
3440                         uma_zfree(V_pf_state_key_z, sk);
3441                 if (nk != NULL)
3442                         uma_zfree(V_pf_state_key_z, nk);
3443         }
3444
3445         /* copy back packet headers if we performed NAT operations */
3446         if (rewrite)
3447                 m_copyback(m, off, hdrlen, pd->hdr.any);
3448
3449         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3450             direction == PF_OUT &&
3451             pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m))
3452                 /*
3453                  * We want the state created, but we dont
3454                  * want to send this in case a partner
3455                  * firewall has to know about it to allow
3456                  * replies through it.
3457                  */
3458                 return (PF_DEFER);
3459
3460         return (PF_PASS);
3461
3462 cleanup:
3463         if (sk != NULL)
3464                 uma_zfree(V_pf_state_key_z, sk);
3465         if (nk != NULL)
3466                 uma_zfree(V_pf_state_key_z, nk);
3467         return (PF_DROP);
3468 }
3469
3470 static int
3471 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3472     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3473     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3474     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3475     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3476 {
3477         struct pf_state         *s = NULL;
3478         struct pf_src_node      *sn = NULL;
3479         struct tcphdr           *th = pd->hdr.tcp;
3480         u_int16_t                mss = V_tcp_mssdflt;
3481         u_short                  reason;
3482
3483         /* check maximums */
3484         if (r->max_states &&
3485             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3486                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3487                 REASON_SET(&reason, PFRES_MAXSTATES);
3488                 return (PF_DROP);
3489         }
3490         /* src node for filter rule */
3491         if ((r->rule_flag & PFRULE_SRCTRACK ||
3492             r->rpool.opts & PF_POOL_STICKYADDR) &&
3493             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3494                 REASON_SET(&reason, PFRES_SRCLIMIT);
3495                 goto csfailed;
3496         }
3497         /* src node for translation rule */
3498         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3499             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3500                 REASON_SET(&reason, PFRES_SRCLIMIT);
3501                 goto csfailed;
3502         }
3503         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3504         if (s == NULL) {
3505                 REASON_SET(&reason, PFRES_MEMORY);
3506                 goto csfailed;
3507         }
3508         s->rule.ptr = r;
3509         s->nat_rule.ptr = nr;
3510         s->anchor.ptr = a;
3511         STATE_INC_COUNTERS(s);
3512         if (r->allow_opts)
3513                 s->state_flags |= PFSTATE_ALLOWOPTS;
3514         if (r->rule_flag & PFRULE_STATESLOPPY)
3515                 s->state_flags |= PFSTATE_SLOPPY;
3516         s->log = r->log & PF_LOG_ALL;
3517         s->sync_state = PFSYNC_S_NONE;
3518         if (nr != NULL)
3519                 s->log |= nr->log & PF_LOG_ALL;
3520         switch (pd->proto) {
3521         case IPPROTO_TCP:
3522                 s->src.seqlo = ntohl(th->th_seq);
3523                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3524                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3525                     r->keep_state == PF_STATE_MODULATE) {
3526                         /* Generate sequence number modulator */
3527                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3528                             0)
3529                                 s->src.seqdiff = 1;
3530                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3531                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3532                         *rewrite = 1;
3533                 } else
3534                         s->src.seqdiff = 0;
3535                 if (th->th_flags & TH_SYN) {
3536                         s->src.seqhi++;
3537                         s->src.wscale = pf_get_wscale(m, off,
3538                             th->th_off, pd->af);
3539                 }
3540                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3541                 if (s->src.wscale & PF_WSCALE_MASK) {
3542                         /* Remove scale factor from initial window */
3543                         int win = s->src.max_win;
3544                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3545                         s->src.max_win = (win - 1) >>
3546                             (s->src.wscale & PF_WSCALE_MASK);
3547                 }
3548                 if (th->th_flags & TH_FIN)
3549                         s->src.seqhi++;
3550                 s->dst.seqhi = 1;
3551                 s->dst.max_win = 1;
3552                 s->src.state = TCPS_SYN_SENT;
3553                 s->dst.state = TCPS_CLOSED;
3554                 s->timeout = PFTM_TCP_FIRST_PACKET;
3555                 break;
3556         case IPPROTO_UDP:
3557                 s->src.state = PFUDPS_SINGLE;
3558                 s->dst.state = PFUDPS_NO_TRAFFIC;
3559                 s->timeout = PFTM_UDP_FIRST_PACKET;
3560                 break;
3561         case IPPROTO_ICMP:
3562 #ifdef INET6
3563         case IPPROTO_ICMPV6:
3564 #endif
3565                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3566                 break;
3567         default:
3568                 s->src.state = PFOTHERS_SINGLE;
3569                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3570                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3571         }
3572
3573         if (r->rt && r->rt != PF_FASTROUTE) {
3574                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3575                         REASON_SET(&reason, PFRES_BADSTATE);
3576                         pf_src_tree_remove_state(s);
3577                         STATE_DEC_COUNTERS(s);
3578                         uma_zfree(V_pf_state_z, s);
3579                         goto csfailed;
3580                 }
3581                 s->rt_kif = r->rpool.cur->kif;
3582         }
3583
3584         s->creation = time_uptime;
3585         s->expire = time_uptime;
3586
3587         if (sn != NULL) {
3588                 s->src_node = sn;
3589                 s->src_node->states++;
3590         }
3591         if (nsn != NULL) {
3592                 /* XXX We only modify one side for now. */
3593                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3594                 s->nat_src_node = nsn;
3595                 s->nat_src_node->states++;
3596         }
3597         if (pd->proto == IPPROTO_TCP) {
3598                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3599                     off, pd, th, &s->src, &s->dst)) {
3600                         REASON_SET(&reason, PFRES_MEMORY);
3601                         pf_src_tree_remove_state(s);
3602                         STATE_DEC_COUNTERS(s);
3603                         uma_zfree(V_pf_state_z, s);
3604                         return (PF_DROP);
3605                 }
3606                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3607                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3608                     &s->src, &s->dst, rewrite)) {
3609                         /* This really shouldn't happen!!! */
3610                         DPFPRINTF(PF_DEBUG_URGENT,
3611                             ("pf_normalize_tcp_stateful failed on first pkt"));
3612                         pf_normalize_tcp_cleanup(s);
3613                         pf_src_tree_remove_state(s);
3614                         STATE_DEC_COUNTERS(s);
3615                         uma_zfree(V_pf_state_z, s);
3616                         return (PF_DROP);
3617                 }
3618         }
3619         s->direction = pd->dir;
3620
3621         /*
3622          * sk/nk could already been setup by pf_get_translation().
3623          */
3624         if (nr == NULL) {
3625                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3626                     __func__, nr, sk, nk));
3627                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3628                 if (sk == NULL)
3629                         goto csfailed;
3630                 nk = sk;
3631         } else
3632                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3633                     __func__, nr, sk, nk));
3634
3635         /* Swap sk/nk for PF_OUT. */
3636         if (pf_state_insert(BOUND_IFACE(r, kif),
3637             (pd->dir == PF_IN) ? sk : nk,
3638             (pd->dir == PF_IN) ? nk : sk, s)) {
3639                 if (pd->proto == IPPROTO_TCP)
3640                         pf_normalize_tcp_cleanup(s);
3641                 REASON_SET(&reason, PFRES_STATEINS);
3642                 pf_src_tree_remove_state(s);
3643                 STATE_DEC_COUNTERS(s);
3644                 uma_zfree(V_pf_state_z, s);
3645                 return (PF_DROP);
3646         } else
3647                 *sm = s;
3648
3649         if (tag > 0)
3650                 s->tag = tag;
3651         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3652             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3653                 s->src.state = PF_TCPS_PROXY_SRC;
3654                 /* undo NAT changes, if they have taken place */
3655                 if (nr != NULL) {
3656                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3657                         if (pd->dir == PF_OUT)
3658                                 skt = s->key[PF_SK_STACK];
3659                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3660                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3661                         if (pd->sport)
3662                                 *pd->sport = skt->port[pd->sidx];
3663                         if (pd->dport)
3664                                 *pd->dport = skt->port[pd->didx];
3665                         if (pd->proto_sum)
3666                                 *pd->proto_sum = bproto_sum;
3667                         if (pd->ip_sum)
3668                                 *pd->ip_sum = bip_sum;
3669                         m_copyback(m, off, hdrlen, pd->hdr.any);
3670                 }
3671                 s->src.seqhi = htonl(arc4random());
3672                 /* Find mss option */
3673                 int rtid = M_GETFIB(m);
3674                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3675                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3676                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3677                 s->src.mss = mss;
3678                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3679                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3680                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3681                 REASON_SET(&reason, PFRES_SYNPROXY);
3682                 return (PF_SYNPROXY_DROP);
3683         }
3684
3685         return (PF_PASS);
3686
3687 csfailed:
3688         if (sk != NULL)
3689                 uma_zfree(V_pf_state_key_z, sk);
3690         if (nk != NULL)
3691                 uma_zfree(V_pf_state_key_z, nk);
3692
3693         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
3694                 pf_unlink_src_node(sn);
3695                 pf_free_src_node(sn);
3696         }
3697
3698         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
3699                 pf_unlink_src_node(nsn);
3700                 pf_free_src_node(nsn);
3701         }
3702
3703         return (PF_DROP);
3704 }
3705
3706 static int
3707 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3708     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3709     struct pf_ruleset **rsm)
3710 {
3711         struct pf_rule          *r, *a = NULL;
3712         struct pf_ruleset       *ruleset = NULL;
3713         sa_family_t              af = pd->af;
3714         u_short                  reason;
3715         int                      tag = -1;
3716         int                      asd = 0;
3717         int                      match = 0;
3718         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3719
3720         PF_RULES_RASSERT();
3721
3722         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3723         while (r != NULL) {
3724                 r->evaluations++;
3725                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3726                         r = r->skip[PF_SKIP_IFP].ptr;
3727                 else if (r->direction && r->direction != direction)
3728                         r = r->skip[PF_SKIP_DIR].ptr;
3729                 else if (r->af && r->af != af)
3730                         r = r->skip[PF_SKIP_AF].ptr;
3731                 else if (r->proto && r->proto != pd->proto)
3732                         r = r->skip[PF_SKIP_PROTO].ptr;
3733                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3734                     r->src.neg, kif, M_GETFIB(m)))
3735                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3736                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3737                     r->dst.neg, NULL, M_GETFIB(m)))
3738                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3739                 else if (r->tos && !(r->tos == pd->tos))
3740                         r = TAILQ_NEXT(r, entries);
3741                 else if (r->os_fingerprint != PF_OSFP_ANY)
3742                         r = TAILQ_NEXT(r, entries);
3743                 else if (pd->proto == IPPROTO_UDP &&
3744                     (r->src.port_op || r->dst.port_op))
3745                         r = TAILQ_NEXT(r, entries);
3746                 else if (pd->proto == IPPROTO_TCP &&
3747                     (r->src.port_op || r->dst.port_op || r->flagset))
3748                         r = TAILQ_NEXT(r, entries);
3749                 else if ((pd->proto == IPPROTO_ICMP ||
3750                     pd->proto == IPPROTO_ICMPV6) &&
3751                     (r->type || r->code))
3752                         r = TAILQ_NEXT(r, entries);
3753                 else if (r->prob && r->prob <=
3754                     (arc4random() % (UINT_MAX - 1) + 1))
3755                         r = TAILQ_NEXT(r, entries);
3756                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3757                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3758                         r = TAILQ_NEXT(r, entries);
3759                 else {
3760                         if (r->anchor == NULL) {
3761                                 match = 1;
3762                                 *rm = r;
3763                                 *am = a;
3764                                 *rsm = ruleset;
3765                                 if ((*rm)->quick)
3766                                         break;
3767                                 r = TAILQ_NEXT(r, entries);
3768                         } else
3769                                 pf_step_into_anchor(anchor_stack, &asd,
3770                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3771                                     &match);
3772                 }
3773                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3774                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3775                         break;
3776         }
3777         r = *rm;
3778         a = *am;
3779         ruleset = *rsm;
3780
3781         REASON_SET(&reason, PFRES_MATCH);
3782
3783         if (r->log)
3784                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3785                     1);
3786
3787         if (r->action != PF_PASS)
3788                 return (PF_DROP);
3789
3790         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3791                 REASON_SET(&reason, PFRES_MEMORY);
3792                 return (PF_DROP);
3793         }
3794
3795         return (PF_PASS);
3796 }
3797
3798 static int
3799 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3800         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3801         struct pf_pdesc *pd, u_short *reason, int *copyback)
3802 {
3803         struct tcphdr           *th = pd->hdr.tcp;
3804         u_int16_t                win = ntohs(th->th_win);
3805         u_int32_t                ack, end, seq, orig_seq;
3806         u_int8_t                 sws, dws;
3807         int                      ackskew;
3808
3809         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3810                 sws = src->wscale & PF_WSCALE_MASK;
3811                 dws = dst->wscale & PF_WSCALE_MASK;
3812         } else
3813                 sws = dws = 0;
3814
3815         /*
3816          * Sequence tracking algorithm from Guido van Rooij's paper:
3817          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3818          *      tcp_filtering.ps
3819          */
3820
3821         orig_seq = seq = ntohl(th->th_seq);
3822         if (src->seqlo == 0) {
3823                 /* First packet from this end. Set its state */
3824
3825                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3826                     src->scrub == NULL) {
3827                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3828                                 REASON_SET(reason, PFRES_MEMORY);
3829                                 return (PF_DROP);
3830                         }
3831                 }
3832
3833                 /* Deferred generation of sequence number modulator */
3834                 if (dst->seqdiff && !src->seqdiff) {
3835                         /* use random iss for the TCP server */
3836                         while ((src->seqdiff = arc4random() - seq) == 0)
3837                                 ;
3838                         ack = ntohl(th->th_ack) - dst->seqdiff;
3839                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3840                             src->seqdiff), 0);
3841                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3842                         *copyback = 1;
3843                 } else {
3844                         ack = ntohl(th->th_ack);
3845                 }
3846
3847                 end = seq + pd->p_len;
3848                 if (th->th_flags & TH_SYN) {
3849                         end++;
3850                         if (dst->wscale & PF_WSCALE_FLAG) {
3851                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3852                                     pd->af);
3853                                 if (src->wscale & PF_WSCALE_FLAG) {
3854                                         /* Remove scale factor from initial
3855                                          * window */
3856                                         sws = src->wscale & PF_WSCALE_MASK;
3857                                         win = ((u_int32_t)win + (1 << sws) - 1)
3858                                             >> sws;
3859                                         dws = dst->wscale & PF_WSCALE_MASK;
3860                                 } else {
3861                                         /* fixup other window */
3862                                         dst->max_win <<= dst->wscale &
3863                                             PF_WSCALE_MASK;
3864                                         /* in case of a retrans SYN|ACK */
3865                                         dst->wscale = 0;
3866                                 }
3867                         }
3868                 }
3869                 if (th->th_flags & TH_FIN)
3870                         end++;
3871
3872                 src->seqlo = seq;
3873                 if (src->state < TCPS_SYN_SENT)
3874                         src->state = TCPS_SYN_SENT;
3875
3876                 /*
3877                  * May need to slide the window (seqhi may have been set by
3878                  * the crappy stack check or if we picked up the connection
3879                  * after establishment)
3880                  */
3881                 if (src->seqhi == 1 ||
3882                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
3883                         src->seqhi = end + MAX(1, dst->max_win << dws);
3884                 if (win > src->max_win)
3885                         src->max_win = win;
3886
3887         } else {
3888                 ack = ntohl(th->th_ack) - dst->seqdiff;
3889                 if (src->seqdiff) {
3890                         /* Modulate sequence numbers */
3891                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3892                             src->seqdiff), 0);
3893                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3894                         *copyback = 1;
3895                 }
3896                 end = seq + pd->p_len;
3897                 if (th->th_flags & TH_SYN)
3898                         end++;
3899                 if (th->th_flags & TH_FIN)
3900                         end++;
3901         }
3902
3903         if ((th->th_flags & TH_ACK) == 0) {
3904                 /* Let it pass through the ack skew check */
3905                 ack = dst->seqlo;
3906         } else if ((ack == 0 &&
3907             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
3908             /* broken tcp stacks do not set ack */
3909             (dst->state < TCPS_SYN_SENT)) {
3910                 /*
3911                  * Many stacks (ours included) will set the ACK number in an
3912                  * FIN|ACK if the SYN times out -- no sequence to ACK.
3913                  */
3914                 ack = dst->seqlo;
3915         }
3916
3917         if (seq == end) {
3918                 /* Ease sequencing restrictions on no data packets */
3919                 seq = src->seqlo;
3920                 end = seq;
3921         }
3922
3923         ackskew = dst->seqlo - ack;
3924
3925
3926         /*
3927          * Need to demodulate the sequence numbers in any TCP SACK options
3928          * (Selective ACK). We could optionally validate the SACK values
3929          * against the current ACK window, either forwards or backwards, but
3930          * I'm not confident that SACK has been implemented properly
3931          * everywhere. It wouldn't surprise me if several stacks accidently
3932          * SACK too far backwards of previously ACKed data. There really aren't
3933          * any security implications of bad SACKing unless the target stack
3934          * doesn't validate the option length correctly. Someone trying to
3935          * spoof into a TCP connection won't bother blindly sending SACK
3936          * options anyway.
3937          */
3938         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
3939                 if (pf_modulate_sack(m, off, pd, th, dst))
3940                         *copyback = 1;
3941         }
3942
3943
3944 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
3945         if (SEQ_GEQ(src->seqhi, end) &&
3946             /* Last octet inside other's window space */
3947             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
3948             /* Retrans: not more than one window back */
3949             (ackskew >= -MAXACKWINDOW) &&
3950             /* Acking not more than one reassembled fragment backwards */
3951             (ackskew <= (MAXACKWINDOW << sws)) &&
3952             /* Acking not more than one window forward */
3953             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
3954             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
3955             (pd->flags & PFDESC_IP_REAS) == 0)) {
3956             /* Require an exact/+1 sequence match on resets when possible */
3957
3958                 if (dst->scrub || src->scrub) {
3959                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
3960                             *state, src, dst, copyback))
3961                                 return (PF_DROP);
3962                 }
3963
3964                 /* update max window */
3965                 if (src->max_win < win)
3966                         src->max_win = win;
3967                 /* synchronize sequencing */
3968                 if (SEQ_GT(end, src->seqlo))
3969                         src->seqlo = end;
3970                 /* slide the window of what the other end can send */
3971                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
3972                         dst->seqhi = ack + MAX((win << sws), 1);
3973
3974
3975                 /* update states */
3976                 if (th->th_flags & TH_SYN)
3977                         if (src->state < TCPS_SYN_SENT)
3978                                 src->state = TCPS_SYN_SENT;
3979                 if (th->th_flags & TH_FIN)
3980                         if (src->state < TCPS_CLOSING)
3981                                 src->state = TCPS_CLOSING;
3982                 if (th->th_flags & TH_ACK) {
3983                         if (dst->state == TCPS_SYN_SENT) {
3984                                 dst->state = TCPS_ESTABLISHED;
3985                                 if (src->state == TCPS_ESTABLISHED &&
3986                                     (*state)->src_node != NULL &&
3987                                     pf_src_connlimit(state)) {
3988                                         REASON_SET(reason, PFRES_SRCLIMIT);
3989                                         return (PF_DROP);
3990                                 }
3991                         } else if (dst->state == TCPS_CLOSING)
3992                                 dst->state = TCPS_FIN_WAIT_2;
3993                 }
3994                 if (th->th_flags & TH_RST)
3995                         src->state = dst->state = TCPS_TIME_WAIT;
3996
3997                 /* update expire time */
3998                 (*state)->expire = time_uptime;
3999                 if (src->state >= TCPS_FIN_WAIT_2 &&
4000                     dst->state >= TCPS_FIN_WAIT_2)
4001                         (*state)->timeout = PFTM_TCP_CLOSED;
4002                 else if (src->state >= TCPS_CLOSING &&
4003                     dst->state >= TCPS_CLOSING)
4004                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4005                 else if (src->state < TCPS_ESTABLISHED ||
4006                     dst->state < TCPS_ESTABLISHED)
4007                         (*state)->timeout = PFTM_TCP_OPENING;
4008                 else if (src->state >= TCPS_CLOSING ||
4009                     dst->state >= TCPS_CLOSING)
4010                         (*state)->timeout = PFTM_TCP_CLOSING;
4011                 else
4012                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4013
4014                 /* Fall through to PASS packet */
4015
4016         } else if ((dst->state < TCPS_SYN_SENT ||
4017                 dst->state >= TCPS_FIN_WAIT_2 ||
4018                 src->state >= TCPS_FIN_WAIT_2) &&
4019             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4020             /* Within a window forward of the originating packet */
4021             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4022             /* Within a window backward of the originating packet */
4023
4024                 /*
4025                  * This currently handles three situations:
4026                  *  1) Stupid stacks will shotgun SYNs before their peer
4027                  *     replies.
4028                  *  2) When PF catches an already established stream (the
4029                  *     firewall rebooted, the state table was flushed, routes
4030                  *     changed...)
4031                  *  3) Packets get funky immediately after the connection
4032                  *     closes (this should catch Solaris spurious ACK|FINs
4033                  *     that web servers like to spew after a close)
4034                  *
4035                  * This must be a little more careful than the above code
4036                  * since packet floods will also be caught here. We don't
4037                  * update the TTL here to mitigate the damage of a packet
4038                  * flood and so the same code can handle awkward establishment
4039                  * and a loosened connection close.
4040                  * In the establishment case, a correct peer response will
4041                  * validate the connection, go through the normal state code
4042                  * and keep updating the state TTL.
4043                  */
4044
4045                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4046                         printf("pf: loose state match: ");
4047                         pf_print_state(*state);
4048                         pf_print_flags(th->th_flags);
4049                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4050                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4051                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4052                             (unsigned long long)(*state)->packets[1],
4053                             pd->dir == PF_IN ? "in" : "out",
4054                             pd->dir == (*state)->direction ? "fwd" : "rev");
4055                 }
4056
4057                 if (dst->scrub || src->scrub) {
4058                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4059                             *state, src, dst, copyback))
4060                                 return (PF_DROP);
4061                 }
4062
4063                 /* update max window */
4064                 if (src->max_win < win)
4065                         src->max_win = win;
4066                 /* synchronize sequencing */
4067                 if (SEQ_GT(end, src->seqlo))
4068                         src->seqlo = end;
4069                 /* slide the window of what the other end can send */
4070                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4071                         dst->seqhi = ack + MAX((win << sws), 1);
4072
4073                 /*
4074                  * Cannot set dst->seqhi here since this could be a shotgunned
4075                  * SYN and not an already established connection.
4076                  */
4077
4078                 if (th->th_flags & TH_FIN)
4079                         if (src->state < TCPS_CLOSING)
4080                                 src->state = TCPS_CLOSING;
4081                 if (th->th_flags & TH_RST)
4082                         src->state = dst->state = TCPS_TIME_WAIT;
4083
4084                 /* Fall through to PASS packet */
4085
4086         } else {
4087                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4088                     (*state)->src.state == TCPS_SYN_SENT) {
4089                         /* Send RST for state mismatches during handshake */
4090                         if (!(th->th_flags & TH_RST))
4091                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4092                                     pd->dst, pd->src, th->th_dport,
4093                                     th->th_sport, ntohl(th->th_ack), 0,
4094                                     TH_RST, 0, 0,
4095                                     (*state)->rule.ptr->return_ttl, 1, 0,
4096                                     kif->pfik_ifp);
4097                         src->seqlo = 0;
4098                         src->seqhi = 1;
4099                         src->max_win = 1;
4100                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4101                         printf("pf: BAD state: ");
4102                         pf_print_state(*state);
4103                         pf_print_flags(th->th_flags);
4104                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4105                             "pkts=%llu:%llu dir=%s,%s\n",
4106                             seq, orig_seq, ack, pd->p_len, ackskew,
4107                             (unsigned long long)(*state)->packets[0],
4108                             (unsigned long long)(*state)->packets[1],
4109                             pd->dir == PF_IN ? "in" : "out",
4110                             pd->dir == (*state)->direction ? "fwd" : "rev");
4111                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4112                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4113                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4114                             ' ': '2',
4115                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4116                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4117                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4118                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4119                 }
4120                 REASON_SET(reason, PFRES_BADSTATE);
4121                 return (PF_DROP);
4122         }
4123
4124         return (PF_PASS);
4125 }
4126
4127 static int
4128 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4129         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4130 {
4131         struct tcphdr           *th = pd->hdr.tcp;
4132
4133         if (th->th_flags & TH_SYN)
4134                 if (src->state < TCPS_SYN_SENT)
4135                         src->state = TCPS_SYN_SENT;
4136         if (th->th_flags & TH_FIN)
4137                 if (src->state < TCPS_CLOSING)
4138                         src->state = TCPS_CLOSING;
4139         if (th->th_flags & TH_ACK) {
4140                 if (dst->state == TCPS_SYN_SENT) {
4141                         dst->state = TCPS_ESTABLISHED;
4142                         if (src->state == TCPS_ESTABLISHED &&
4143                             (*state)->src_node != NULL &&
4144                             pf_src_connlimit(state)) {
4145                                 REASON_SET(reason, PFRES_SRCLIMIT);
4146                                 return (PF_DROP);
4147                         }
4148                 } else if (dst->state == TCPS_CLOSING) {
4149                         dst->state = TCPS_FIN_WAIT_2;
4150                 } else if (src->state == TCPS_SYN_SENT &&
4151                     dst->state < TCPS_SYN_SENT) {
4152                         /*
4153                          * Handle a special sloppy case where we only see one
4154                          * half of the connection. If there is a ACK after
4155                          * the initial SYN without ever seeing a packet from
4156                          * the destination, set the connection to established.
4157                          */
4158                         dst->state = src->state = TCPS_ESTABLISHED;
4159                         if ((*state)->src_node != NULL &&
4160                             pf_src_connlimit(state)) {
4161                                 REASON_SET(reason, PFRES_SRCLIMIT);
4162                                 return (PF_DROP);
4163                         }
4164                 } else if (src->state == TCPS_CLOSING &&
4165                     dst->state == TCPS_ESTABLISHED &&
4166                     dst->seqlo == 0) {
4167                         /*
4168                          * Handle the closing of half connections where we
4169                          * don't see the full bidirectional FIN/ACK+ACK
4170                          * handshake.
4171                          */
4172                         dst->state = TCPS_CLOSING;
4173                 }
4174         }
4175         if (th->th_flags & TH_RST)
4176                 src->state = dst->state = TCPS_TIME_WAIT;
4177
4178         /* update expire time */
4179         (*state)->expire = time_uptime;
4180         if (src->state >= TCPS_FIN_WAIT_2 &&
4181             dst->state >= TCPS_FIN_WAIT_2)
4182                 (*state)->timeout = PFTM_TCP_CLOSED;
4183         else if (src->state >= TCPS_CLOSING &&
4184             dst->state >= TCPS_CLOSING)
4185                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4186         else if (src->state < TCPS_ESTABLISHED ||
4187             dst->state < TCPS_ESTABLISHED)
4188                 (*state)->timeout = PFTM_TCP_OPENING;
4189         else if (src->state >= TCPS_CLOSING ||
4190             dst->state >= TCPS_CLOSING)
4191                 (*state)->timeout = PFTM_TCP_CLOSING;
4192         else
4193                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4194
4195         return (PF_PASS);
4196 }
4197
4198 static int
4199 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4200     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4201     u_short *reason)
4202 {
4203         struct pf_state_key_cmp  key;
4204         struct tcphdr           *th = pd->hdr.tcp;
4205         int                      copyback = 0;
4206         struct pf_state_peer    *src, *dst;
4207         struct pf_state_key     *sk;
4208
4209         bzero(&key, sizeof(key));
4210         key.af = pd->af;
4211         key.proto = IPPROTO_TCP;
4212         if (direction == PF_IN) {       /* wire side, straight */
4213                 PF_ACPY(&key.addr[0], pd->src, key.af);
4214                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4215                 key.port[0] = th->th_sport;
4216                 key.port[1] = th->th_dport;
4217         } else {                        /* stack side, reverse */
4218                 PF_ACPY(&key.addr[1], pd->src, key.af);
4219                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4220                 key.port[1] = th->th_sport;
4221                 key.port[0] = th->th_dport;
4222         }
4223
4224         STATE_LOOKUP(kif, &key, direction, *state, pd);
4225
4226         if (direction == (*state)->direction) {
4227                 src = &(*state)->src;
4228                 dst = &(*state)->dst;
4229         } else {
4230                 src = &(*state)->dst;
4231                 dst = &(*state)->src;
4232         }
4233
4234         sk = (*state)->key[pd->didx];
4235
4236         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4237                 if (direction != (*state)->direction) {
4238                         REASON_SET(reason, PFRES_SYNPROXY);
4239                         return (PF_SYNPROXY_DROP);
4240                 }
4241                 if (th->th_flags & TH_SYN) {
4242                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4243                                 REASON_SET(reason, PFRES_SYNPROXY);
4244                                 return (PF_DROP);
4245                         }
4246                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4247                             pd->src, th->th_dport, th->th_sport,
4248                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4249                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4250                         REASON_SET(reason, PFRES_SYNPROXY);
4251                         return (PF_SYNPROXY_DROP);
4252                 } else if (!(th->th_flags & TH_ACK) ||
4253                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4254                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4255                         REASON_SET(reason, PFRES_SYNPROXY);
4256                         return (PF_DROP);
4257                 } else if ((*state)->src_node != NULL &&
4258                     pf_src_connlimit(state)) {
4259                         REASON_SET(reason, PFRES_SRCLIMIT);
4260                         return (PF_DROP);
4261                 } else
4262                         (*state)->src.state = PF_TCPS_PROXY_DST;
4263         }
4264         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4265                 if (direction == (*state)->direction) {
4266                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4267                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4268                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4269                                 REASON_SET(reason, PFRES_SYNPROXY);
4270                                 return (PF_DROP);
4271                         }
4272                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4273                         if ((*state)->dst.seqhi == 1)
4274                                 (*state)->dst.seqhi = htonl(arc4random());
4275                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4276                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4277                             sk->port[pd->sidx], sk->port[pd->didx],
4278                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4279                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4280                         REASON_SET(reason, PFRES_SYNPROXY);
4281                         return (PF_SYNPROXY_DROP);
4282                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4283                     (TH_SYN|TH_ACK)) ||
4284                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4285                         REASON_SET(reason, PFRES_SYNPROXY);
4286                         return (PF_DROP);
4287                 } else {
4288                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4289                         (*state)->dst.seqlo = ntohl(th->th_seq);
4290                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4291                             pd->src, th->th_dport, th->th_sport,
4292                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4293                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4294                             (*state)->tag, NULL);
4295                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4296                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4297                             sk->port[pd->sidx], sk->port[pd->didx],
4298                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4299                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4300                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4301                             (*state)->src.seqlo;
4302                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4303                             (*state)->dst.seqlo;
4304                         (*state)->src.seqhi = (*state)->src.seqlo +
4305                             (*state)->dst.max_win;
4306                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4307                             (*state)->src.max_win;
4308                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4309                         (*state)->src.state = (*state)->dst.state =
4310                             TCPS_ESTABLISHED;
4311                         REASON_SET(reason, PFRES_SYNPROXY);
4312                         return (PF_SYNPROXY_DROP);
4313                 }
4314         }
4315
4316         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4317             dst->state >= TCPS_FIN_WAIT_2 &&
4318             src->state >= TCPS_FIN_WAIT_2) {
4319                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4320                         printf("pf: state reuse ");
4321                         pf_print_state(*state);
4322                         pf_print_flags(th->th_flags);
4323                         printf("\n");
4324                 }
4325                 /* XXX make sure it's the same direction ?? */
4326                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4327                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4328                 *state = NULL;
4329                 return (PF_DROP);
4330         }
4331
4332         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4333                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4334                         return (PF_DROP);
4335         } else {
4336                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4337                     &copyback) == PF_DROP)
4338                         return (PF_DROP);
4339         }
4340
4341         /* translate source/destination address, if necessary */
4342         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4343                 struct pf_state_key *nk = (*state)->key[pd->didx];
4344
4345                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4346                     nk->port[pd->sidx] != th->th_sport)
4347                         pf_change_ap(m, pd->src, &th->th_sport,
4348                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4349                             nk->port[pd->sidx], 0, pd->af);
4350
4351                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4352                     nk->port[pd->didx] != th->th_dport)
4353                         pf_change_ap(m, pd->dst, &th->th_dport,
4354                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4355                             nk->port[pd->didx], 0, pd->af);
4356                 copyback = 1;
4357         }
4358
4359         /* Copyback sequence modulation or stateful scrub changes if needed */
4360         if (copyback)
4361                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4362
4363         return (PF_PASS);
4364 }
4365
4366 static int
4367 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4368     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4369 {
4370         struct pf_state_peer    *src, *dst;
4371         struct pf_state_key_cmp  key;
4372         struct udphdr           *uh = pd->hdr.udp;
4373
4374         bzero(&key, sizeof(key));
4375         key.af = pd->af;
4376         key.proto = IPPROTO_UDP;
4377         if (direction == PF_IN) {       /* wire side, straight */
4378                 PF_ACPY(&key.addr[0], pd->src, key.af);
4379                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4380                 key.port[0] = uh->uh_sport;
4381                 key.port[1] = uh->uh_dport;
4382         } else {                        /* stack side, reverse */
4383                 PF_ACPY(&key.addr[1], pd->src, key.af);
4384                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4385                 key.port[1] = uh->uh_sport;
4386                 key.port[0] = uh->uh_dport;
4387         }
4388
4389         STATE_LOOKUP(kif, &key, direction, *state, pd);
4390
4391         if (direction == (*state)->direction) {
4392                 src = &(*state)->src;
4393                 dst = &(*state)->dst;
4394         } else {
4395                 src = &(*state)->dst;
4396                 dst = &(*state)->src;
4397         }
4398
4399         /* update states */
4400         if (src->state < PFUDPS_SINGLE)
4401                 src->state = PFUDPS_SINGLE;
4402         if (dst->state == PFUDPS_SINGLE)
4403                 dst->state = PFUDPS_MULTIPLE;
4404
4405         /* update expire time */
4406         (*state)->expire = time_uptime;
4407         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4408                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4409         else
4410                 (*state)->timeout = PFTM_UDP_SINGLE;
4411
4412         /* translate source/destination address, if necessary */
4413         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4414                 struct pf_state_key *nk = (*state)->key[pd->didx];
4415
4416                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4417                     nk->port[pd->sidx] != uh->uh_sport)
4418                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4419                             &uh->uh_sum, &nk->addr[pd->sidx],
4420                             nk->port[pd->sidx], 1, pd->af);
4421
4422                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4423                     nk->port[pd->didx] != uh->uh_dport)
4424                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4425                             &uh->uh_sum, &nk->addr[pd->didx],
4426                             nk->port[pd->didx], 1, pd->af);
4427                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4428         }
4429
4430         return (PF_PASS);
4431 }
4432
4433 static int
4434 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4435     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4436 {
4437         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4438         u_int16_t        icmpid = 0, *icmpsum;
4439         u_int8_t         icmptype;
4440         int              state_icmp = 0;
4441         struct pf_state_key_cmp key;
4442
4443         bzero(&key, sizeof(key));
4444         switch (pd->proto) {
4445 #ifdef INET
4446         case IPPROTO_ICMP:
4447                 icmptype = pd->hdr.icmp->icmp_type;
4448                 icmpid = pd->hdr.icmp->icmp_id;
4449                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4450
4451                 if (icmptype == ICMP_UNREACH ||
4452                     icmptype == ICMP_SOURCEQUENCH ||
4453                     icmptype == ICMP_REDIRECT ||
4454                     icmptype == ICMP_TIMXCEED ||
4455                     icmptype == ICMP_PARAMPROB)
4456                         state_icmp++;
4457                 break;
4458 #endif /* INET */
4459 #ifdef INET6
4460         case IPPROTO_ICMPV6:
4461                 icmptype = pd->hdr.icmp6->icmp6_type;
4462                 icmpid = pd->hdr.icmp6->icmp6_id;
4463                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4464
4465                 if (icmptype == ICMP6_DST_UNREACH ||
4466                     icmptype == ICMP6_PACKET_TOO_BIG ||
4467                     icmptype == ICMP6_TIME_EXCEEDED ||
4468                     icmptype == ICMP6_PARAM_PROB)
4469                         state_icmp++;
4470                 break;
4471 #endif /* INET6 */
4472         }
4473
4474         if (!state_icmp) {
4475
4476                 /*
4477                  * ICMP query/reply message not related to a TCP/UDP packet.
4478                  * Search for an ICMP state.
4479                  */
4480                 key.af = pd->af;
4481                 key.proto = pd->proto;
4482                 key.port[0] = key.port[1] = icmpid;
4483                 if (direction == PF_IN) {       /* wire side, straight */
4484                         PF_ACPY(&key.addr[0], pd->src, key.af);
4485                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4486                 } else {                        /* stack side, reverse */
4487                         PF_ACPY(&key.addr[1], pd->src, key.af);
4488                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4489                 }
4490
4491                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4492
4493                 (*state)->expire = time_uptime;
4494                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4495
4496                 /* translate source/destination address, if necessary */
4497                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4498                         struct pf_state_key *nk = (*state)->key[pd->didx];
4499
4500                         switch (pd->af) {
4501 #ifdef INET
4502                         case AF_INET:
4503                                 if (PF_ANEQ(pd->src,
4504                                     &nk->addr[pd->sidx], AF_INET))
4505                                         pf_change_a(&saddr->v4.s_addr,
4506                                             pd->ip_sum,
4507                                             nk->addr[pd->sidx].v4.s_addr, 0);
4508
4509                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4510                                     AF_INET))
4511                                         pf_change_a(&daddr->v4.s_addr,
4512                                             pd->ip_sum,
4513                                             nk->addr[pd->didx].v4.s_addr, 0);
4514
4515                                 if (nk->port[0] !=
4516                                     pd->hdr.icmp->icmp_id) {
4517                                         pd->hdr.icmp->icmp_cksum =
4518                                             pf_cksum_fixup(
4519                                             pd->hdr.icmp->icmp_cksum, icmpid,
4520                                             nk->port[pd->sidx], 0);
4521                                         pd->hdr.icmp->icmp_id =
4522                                             nk->port[pd->sidx];
4523                                 }
4524
4525                                 m_copyback(m, off, ICMP_MINLEN,
4526                                     (caddr_t )pd->hdr.icmp);
4527                                 break;
4528 #endif /* INET */
4529 #ifdef INET6
4530                         case AF_INET6:
4531                                 if (PF_ANEQ(pd->src,
4532                                     &nk->addr[pd->sidx], AF_INET6))
4533                                         pf_change_a6(saddr,
4534                                             &pd->hdr.icmp6->icmp6_cksum,
4535                                             &nk->addr[pd->sidx], 0);
4536
4537                                 if (PF_ANEQ(pd->dst,
4538                                     &nk->addr[pd->didx], AF_INET6))
4539                                         pf_change_a6(daddr,
4540                                             &pd->hdr.icmp6->icmp6_cksum,
4541                                             &nk->addr[pd->didx], 0);
4542
4543                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4544                                     (caddr_t )pd->hdr.icmp6);
4545                                 break;
4546 #endif /* INET6 */
4547                         }
4548                 }
4549                 return (PF_PASS);
4550
4551         } else {
4552                 /*
4553                  * ICMP error message in response to a TCP/UDP packet.
4554                  * Extract the inner TCP/UDP header and search for that state.
4555                  */
4556
4557                 struct pf_pdesc pd2;
4558                 bzero(&pd2, sizeof pd2);
4559 #ifdef INET
4560                 struct ip       h2;
4561 #endif /* INET */
4562 #ifdef INET6
4563                 struct ip6_hdr  h2_6;
4564                 int             terminal = 0;
4565 #endif /* INET6 */
4566                 int             ipoff2 = 0;
4567                 int             off2 = 0;
4568
4569                 pd2.af = pd->af;
4570                 /* Payload packet is from the opposite direction. */
4571                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4572                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4573                 switch (pd->af) {
4574 #ifdef INET
4575                 case AF_INET:
4576                         /* offset of h2 in mbuf chain */
4577                         ipoff2 = off + ICMP_MINLEN;
4578
4579                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4580                             NULL, reason, pd2.af)) {
4581                                 DPFPRINTF(PF_DEBUG_MISC,
4582                                     ("pf: ICMP error message too short "
4583                                     "(ip)\n"));
4584                                 return (PF_DROP);
4585                         }
4586                         /*
4587                          * ICMP error messages don't refer to non-first
4588                          * fragments
4589                          */
4590                         if (h2.ip_off & htons(IP_OFFMASK)) {
4591                                 REASON_SET(reason, PFRES_FRAG);
4592                                 return (PF_DROP);
4593                         }
4594
4595                         /* offset of protocol header that follows h2 */
4596                         off2 = ipoff2 + (h2.ip_hl << 2);
4597
4598                         pd2.proto = h2.ip_p;
4599                         pd2.src = (struct pf_addr *)&h2.ip_src;
4600                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4601                         pd2.ip_sum = &h2.ip_sum;
4602                         break;
4603 #endif /* INET */
4604 #ifdef INET6
4605                 case AF_INET6:
4606                         ipoff2 = off + sizeof(struct icmp6_hdr);
4607
4608                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4609                             NULL, reason, pd2.af)) {
4610                                 DPFPRINTF(PF_DEBUG_MISC,
4611                                     ("pf: ICMP error message too short "
4612                                     "(ip6)\n"));
4613                                 return (PF_DROP);
4614                         }
4615                         pd2.proto = h2_6.ip6_nxt;
4616                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4617                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4618                         pd2.ip_sum = NULL;
4619                         off2 = ipoff2 + sizeof(h2_6);
4620                         do {
4621                                 switch (pd2.proto) {
4622                                 case IPPROTO_FRAGMENT:
4623                                         /*
4624                                          * ICMPv6 error messages for
4625                                          * non-first fragments
4626                                          */
4627                                         REASON_SET(reason, PFRES_FRAG);
4628                                         return (PF_DROP);
4629                                 case IPPROTO_AH:
4630                                 case IPPROTO_HOPOPTS:
4631                                 case IPPROTO_ROUTING:
4632                                 case IPPROTO_DSTOPTS: {
4633                                         /* get next header and header length */
4634                                         struct ip6_ext opt6;
4635
4636                                         if (!pf_pull_hdr(m, off2, &opt6,
4637                                             sizeof(opt6), NULL, reason,
4638                                             pd2.af)) {
4639                                                 DPFPRINTF(PF_DEBUG_MISC,
4640                                                     ("pf: ICMPv6 short opt\n"));
4641                                                 return (PF_DROP);
4642                                         }
4643                                         if (pd2.proto == IPPROTO_AH)
4644                                                 off2 += (opt6.ip6e_len + 2) * 4;
4645                                         else
4646                                                 off2 += (opt6.ip6e_len + 1) * 8;
4647                                         pd2.proto = opt6.ip6e_nxt;
4648                                         /* goto the next header */
4649                                         break;
4650                                 }
4651                                 default:
4652                                         terminal++;
4653                                         break;
4654                                 }
4655                         } while (!terminal);
4656                         break;
4657 #endif /* INET6 */
4658                 }
4659
4660                 switch (pd2.proto) {
4661                 case IPPROTO_TCP: {
4662                         struct tcphdr            th;
4663                         u_int32_t                seq;
4664                         struct pf_state_peer    *src, *dst;
4665                         u_int8_t                 dws;
4666                         int                      copyback = 0;
4667
4668                         /*
4669                          * Only the first 8 bytes of the TCP header can be
4670                          * expected. Don't access any TCP header fields after
4671                          * th_seq, an ackskew test is not possible.
4672                          */
4673                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4674                             pd2.af)) {
4675                                 DPFPRINTF(PF_DEBUG_MISC,
4676                                     ("pf: ICMP error message too short "
4677                                     "(tcp)\n"));
4678                                 return (PF_DROP);
4679                         }
4680
4681                         key.af = pd2.af;
4682                         key.proto = IPPROTO_TCP;
4683                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4684                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4685                         key.port[pd2.sidx] = th.th_sport;
4686                         key.port[pd2.didx] = th.th_dport;
4687
4688                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4689
4690                         if (direction == (*state)->direction) {
4691                                 src = &(*state)->dst;
4692                                 dst = &(*state)->src;
4693                         } else {
4694                                 src = &(*state)->src;
4695                                 dst = &(*state)->dst;
4696                         }
4697
4698                         if (src->wscale && dst->wscale)
4699                                 dws = dst->wscale & PF_WSCALE_MASK;
4700                         else
4701                                 dws = 0;
4702
4703                         /* Demodulate sequence number */
4704                         seq = ntohl(th.th_seq) - src->seqdiff;
4705                         if (src->seqdiff) {
4706                                 pf_change_a(&th.th_seq, icmpsum,
4707                                     htonl(seq), 0);
4708                                 copyback = 1;
4709                         }
4710
4711                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4712                             (!SEQ_GEQ(src->seqhi, seq) ||
4713                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4714                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4715                                         printf("pf: BAD ICMP %d:%d ",
4716                                             icmptype, pd->hdr.icmp->icmp_code);
4717                                         pf_print_host(pd->src, 0, pd->af);
4718                                         printf(" -> ");
4719                                         pf_print_host(pd->dst, 0, pd->af);
4720                                         printf(" state: ");
4721                                         pf_print_state(*state);
4722                                         printf(" seq=%u\n", seq);
4723                                 }
4724                                 REASON_SET(reason, PFRES_BADSTATE);
4725                                 return (PF_DROP);
4726                         } else {
4727                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4728                                         printf("pf: OK ICMP %d:%d ",
4729                                             icmptype, pd->hdr.icmp->icmp_code);
4730                                         pf_print_host(pd->src, 0, pd->af);
4731                                         printf(" -> ");
4732                                         pf_print_host(pd->dst, 0, pd->af);
4733                                         printf(" state: ");
4734                                         pf_print_state(*state);
4735                                         printf(" seq=%u\n", seq);
4736                                 }
4737                         }
4738
4739                         /* translate source/destination address, if necessary */
4740                         if ((*state)->key[PF_SK_WIRE] !=
4741                             (*state)->key[PF_SK_STACK]) {
4742                                 struct pf_state_key *nk =
4743                                     (*state)->key[pd->didx];
4744
4745                                 if (PF_ANEQ(pd2.src,
4746                                     &nk->addr[pd2.sidx], pd2.af) ||
4747                                     nk->port[pd2.sidx] != th.th_sport)
4748                                         pf_change_icmp(pd2.src, &th.th_sport,
4749                                             daddr, &nk->addr[pd2.sidx],
4750                                             nk->port[pd2.sidx], NULL,
4751                                             pd2.ip_sum, icmpsum,
4752                                             pd->ip_sum, 0, pd2.af);
4753
4754                                 if (PF_ANEQ(pd2.dst,
4755                                     &nk->addr[pd2.didx], pd2.af) ||
4756                                     nk->port[pd2.didx] != th.th_dport)
4757                                         pf_change_icmp(pd2.dst, &th.th_dport,
4758                                             NULL, /* XXX Inbound NAT? */
4759                                             &nk->addr[pd2.didx],
4760                                             nk->port[pd2.didx], NULL,
4761                                             pd2.ip_sum, icmpsum,
4762                                             pd->ip_sum, 0, pd2.af);
4763                                 copyback = 1;
4764                         }
4765
4766                         if (copyback) {
4767                                 switch (pd2.af) {
4768 #ifdef INET
4769                                 case AF_INET:
4770                                         m_copyback(m, off, ICMP_MINLEN,
4771                                             (caddr_t )pd->hdr.icmp);
4772                                         m_copyback(m, ipoff2, sizeof(h2),
4773                                             (caddr_t )&h2);
4774                                         break;
4775 #endif /* INET */
4776 #ifdef INET6
4777                                 case AF_INET6:
4778                                         m_copyback(m, off,
4779                                             sizeof(struct icmp6_hdr),
4780                                             (caddr_t )pd->hdr.icmp6);
4781                                         m_copyback(m, ipoff2, sizeof(h2_6),
4782                                             (caddr_t )&h2_6);
4783                                         break;
4784 #endif /* INET6 */
4785                                 }
4786                                 m_copyback(m, off2, 8, (caddr_t)&th);
4787                         }
4788
4789                         return (PF_PASS);
4790                         break;
4791                 }
4792                 case IPPROTO_UDP: {
4793                         struct udphdr           uh;
4794
4795                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4796                             NULL, reason, pd2.af)) {
4797                                 DPFPRINTF(PF_DEBUG_MISC,
4798                                     ("pf: ICMP error message too short "
4799                                     "(udp)\n"));
4800                                 return (PF_DROP);
4801                         }
4802
4803                         key.af = pd2.af;
4804                         key.proto = IPPROTO_UDP;
4805                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4806                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4807                         key.port[pd2.sidx] = uh.uh_sport;
4808                         key.port[pd2.didx] = uh.uh_dport;
4809
4810                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4811
4812                         /* translate source/destination address, if necessary */
4813                         if ((*state)->key[PF_SK_WIRE] !=
4814                             (*state)->key[PF_SK_STACK]) {
4815                                 struct pf_state_key *nk =
4816                                     (*state)->key[pd->didx];
4817
4818                                 if (PF_ANEQ(pd2.src,
4819                                     &nk->addr[pd2.sidx], pd2.af) ||
4820                                     nk->port[pd2.sidx] != uh.uh_sport)
4821                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4822                                             daddr, &nk->addr[pd2.sidx],
4823                                             nk->port[pd2.sidx], &uh.uh_sum,
4824                                             pd2.ip_sum, icmpsum,
4825                                             pd->ip_sum, 1, pd2.af);
4826
4827                                 if (PF_ANEQ(pd2.dst,
4828                                     &nk->addr[pd2.didx], pd2.af) ||
4829                                     nk->port[pd2.didx] != uh.uh_dport)
4830                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4831                                             NULL, /* XXX Inbound NAT? */
4832                                             &nk->addr[pd2.didx],
4833                                             nk->port[pd2.didx], &uh.uh_sum,
4834                                             pd2.ip_sum, icmpsum,
4835                                             pd->ip_sum, 1, pd2.af);
4836
4837                                 switch (pd2.af) {
4838 #ifdef INET
4839                                 case AF_INET:
4840                                         m_copyback(m, off, ICMP_MINLEN,
4841                                             (caddr_t )pd->hdr.icmp);
4842                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4843                                         break;
4844 #endif /* INET */
4845 #ifdef INET6
4846                                 case AF_INET6:
4847                                         m_copyback(m, off,
4848                                             sizeof(struct icmp6_hdr),
4849                                             (caddr_t )pd->hdr.icmp6);
4850                                         m_copyback(m, ipoff2, sizeof(h2_6),
4851                                             (caddr_t )&h2_6);
4852                                         break;
4853 #endif /* INET6 */
4854                                 }
4855                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4856                         }
4857                         return (PF_PASS);
4858                         break;
4859                 }
4860 #ifdef INET
4861                 case IPPROTO_ICMP: {
4862                         struct icmp             iih;
4863
4864                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4865                             NULL, reason, pd2.af)) {
4866                                 DPFPRINTF(PF_DEBUG_MISC,
4867                                     ("pf: ICMP error message too short i"
4868                                     "(icmp)\n"));
4869                                 return (PF_DROP);
4870                         }
4871
4872                         key.af = pd2.af;
4873                         key.proto = IPPROTO_ICMP;
4874                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4875                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4876                         key.port[0] = key.port[1] = iih.icmp_id;
4877
4878                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4879
4880                         /* translate source/destination address, if necessary */
4881                         if ((*state)->key[PF_SK_WIRE] !=
4882                             (*state)->key[PF_SK_STACK]) {
4883                                 struct pf_state_key *nk =
4884                                     (*state)->key[pd->didx];
4885
4886                                 if (PF_ANEQ(pd2.src,
4887                                     &nk->addr[pd2.sidx], pd2.af) ||
4888                                     nk->port[pd2.sidx] != iih.icmp_id)
4889                                         pf_change_icmp(pd2.src, &iih.icmp_id,
4890                                             daddr, &nk->addr[pd2.sidx],
4891                                             nk->port[pd2.sidx], NULL,
4892                                             pd2.ip_sum, icmpsum,
4893                                             pd->ip_sum, 0, AF_INET);
4894
4895                                 if (PF_ANEQ(pd2.dst,
4896                                     &nk->addr[pd2.didx], pd2.af) ||
4897                                     nk->port[pd2.didx] != iih.icmp_id)
4898                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
4899                                             NULL, /* XXX Inbound NAT? */
4900                                             &nk->addr[pd2.didx],
4901                                             nk->port[pd2.didx], NULL,
4902                                             pd2.ip_sum, icmpsum,
4903                                             pd->ip_sum, 0, AF_INET);
4904
4905                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
4906                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4907                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
4908                         }
4909                         return (PF_PASS);
4910                         break;
4911                 }
4912 #endif /* INET */
4913 #ifdef INET6
4914                 case IPPROTO_ICMPV6: {
4915                         struct icmp6_hdr        iih;
4916
4917                         if (!pf_pull_hdr(m, off2, &iih,
4918                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
4919                                 DPFPRINTF(PF_DEBUG_MISC,
4920                                     ("pf: ICMP error message too short "
4921                                     "(icmp6)\n"));
4922                                 return (PF_DROP);
4923                         }
4924
4925                         key.af = pd2.af;
4926                         key.proto = IPPROTO_ICMPV6;
4927                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4928                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4929                         key.port[0] = key.port[1] = iih.icmp6_id;
4930
4931                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4932
4933                         /* translate source/destination address, if necessary */
4934                         if ((*state)->key[PF_SK_WIRE] !=
4935                             (*state)->key[PF_SK_STACK]) {
4936                                 struct pf_state_key *nk =
4937                                     (*state)->key[pd->didx];
4938
4939                                 if (PF_ANEQ(pd2.src,
4940                                     &nk->addr[pd2.sidx], pd2.af) ||
4941                                     nk->port[pd2.sidx] != iih.icmp6_id)
4942                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
4943                                             daddr, &nk->addr[pd2.sidx],
4944                                             nk->port[pd2.sidx], NULL,
4945                                             pd2.ip_sum, icmpsum,
4946                                             pd->ip_sum, 0, AF_INET6);
4947
4948                                 if (PF_ANEQ(pd2.dst,
4949                                     &nk->addr[pd2.didx], pd2.af) ||
4950                                     nk->port[pd2.didx] != iih.icmp6_id)
4951                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
4952                                             NULL, /* XXX Inbound NAT? */
4953                                             &nk->addr[pd2.didx],
4954                                             nk->port[pd2.didx], NULL,
4955                                             pd2.ip_sum, icmpsum,
4956                                             pd->ip_sum, 0, AF_INET6);
4957
4958                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4959                                     (caddr_t)pd->hdr.icmp6);
4960                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
4961                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
4962                                     (caddr_t)&iih);
4963                         }
4964                         return (PF_PASS);
4965                         break;
4966                 }
4967 #endif /* INET6 */
4968                 default: {
4969                         key.af = pd2.af;
4970                         key.proto = pd2.proto;
4971                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4972                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4973                         key.port[0] = key.port[1] = 0;
4974
4975                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4976
4977                         /* translate source/destination address, if necessary */
4978                         if ((*state)->key[PF_SK_WIRE] !=
4979                             (*state)->key[PF_SK_STACK]) {
4980                                 struct pf_state_key *nk =
4981                                     (*state)->key[pd->didx];
4982
4983                                 if (PF_ANEQ(pd2.src,
4984                                     &nk->addr[pd2.sidx], pd2.af))
4985                                         pf_change_icmp(pd2.src, NULL, daddr,
4986                                             &nk->addr[pd2.sidx], 0, NULL,
4987                                             pd2.ip_sum, icmpsum,
4988                                             pd->ip_sum, 0, pd2.af);
4989
4990                                 if (PF_ANEQ(pd2.dst,
4991                                     &nk->addr[pd2.didx], pd2.af))
4992                                         pf_change_icmp(pd2.src, NULL,
4993                                             NULL, /* XXX Inbound NAT? */
4994                                             &nk->addr[pd2.didx], 0, NULL,
4995                                             pd2.ip_sum, icmpsum,
4996                                             pd->ip_sum, 0, pd2.af);
4997
4998                                 switch (pd2.af) {
4999 #ifdef INET
5000                                 case AF_INET:
5001                                         m_copyback(m, off, ICMP_MINLEN,
5002                                             (caddr_t)pd->hdr.icmp);
5003                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5004                                         break;
5005 #endif /* INET */
5006 #ifdef INET6
5007                                 case AF_INET6:
5008                                         m_copyback(m, off,
5009                                             sizeof(struct icmp6_hdr),
5010                                             (caddr_t )pd->hdr.icmp6);
5011                                         m_copyback(m, ipoff2, sizeof(h2_6),
5012                                             (caddr_t )&h2_6);
5013                                         break;
5014 #endif /* INET6 */
5015                                 }
5016                         }
5017                         return (PF_PASS);
5018                         break;
5019                 }
5020                 }
5021         }
5022 }
5023
5024 static int
5025 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5026     struct mbuf *m, struct pf_pdesc *pd)
5027 {
5028         struct pf_state_peer    *src, *dst;
5029         struct pf_state_key_cmp  key;
5030
5031         bzero(&key, sizeof(key));
5032         key.af = pd->af;
5033         key.proto = pd->proto;
5034         if (direction == PF_IN) {
5035                 PF_ACPY(&key.addr[0], pd->src, key.af);
5036                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5037                 key.port[0] = key.port[1] = 0;
5038         } else {
5039                 PF_ACPY(&key.addr[1], pd->src, key.af);
5040                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5041                 key.port[1] = key.port[0] = 0;
5042         }
5043
5044         STATE_LOOKUP(kif, &key, direction, *state, pd);
5045
5046         if (direction == (*state)->direction) {
5047                 src = &(*state)->src;
5048                 dst = &(*state)->dst;
5049         } else {
5050                 src = &(*state)->dst;
5051                 dst = &(*state)->src;
5052         }
5053
5054         /* update states */
5055         if (src->state < PFOTHERS_SINGLE)
5056                 src->state = PFOTHERS_SINGLE;
5057         if (dst->state == PFOTHERS_SINGLE)
5058                 dst->state = PFOTHERS_MULTIPLE;
5059
5060         /* update expire time */
5061         (*state)->expire = time_uptime;
5062         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5063                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5064         else
5065                 (*state)->timeout = PFTM_OTHER_SINGLE;
5066
5067         /* translate source/destination address, if necessary */
5068         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5069                 struct pf_state_key *nk = (*state)->key[pd->didx];
5070
5071                 KASSERT(nk, ("%s: nk is null", __func__));
5072                 KASSERT(pd, ("%s: pd is null", __func__));
5073                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
5074                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5075                 switch (pd->af) {
5076 #ifdef INET
5077                 case AF_INET:
5078                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5079                                 pf_change_a(&pd->src->v4.s_addr,
5080                                     pd->ip_sum,
5081                                     nk->addr[pd->sidx].v4.s_addr,
5082                                     0);
5083
5084
5085                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5086                                 pf_change_a(&pd->dst->v4.s_addr,
5087                                     pd->ip_sum,
5088                                     nk->addr[pd->didx].v4.s_addr,
5089                                     0);
5090
5091                                 break;
5092 #endif /* INET */
5093 #ifdef INET6
5094                 case AF_INET6:
5095                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5096                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5097
5098                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5099                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5100 #endif /* INET6 */
5101                 }
5102         }
5103         return (PF_PASS);
5104 }
5105
5106 /*
5107  * ipoff and off are measured from the start of the mbuf chain.
5108  * h must be at "ipoff" on the mbuf chain.
5109  */
5110 void *
5111 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5112     u_short *actionp, u_short *reasonp, sa_family_t af)
5113 {
5114         switch (af) {
5115 #ifdef INET
5116         case AF_INET: {
5117                 struct ip       *h = mtod(m, struct ip *);
5118                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5119
5120                 if (fragoff) {
5121                         if (fragoff >= len)
5122                                 ACTION_SET(actionp, PF_PASS);
5123                         else {
5124                                 ACTION_SET(actionp, PF_DROP);
5125                                 REASON_SET(reasonp, PFRES_FRAG);
5126                         }
5127                         return (NULL);
5128                 }
5129                 if (m->m_pkthdr.len < off + len ||
5130                     ntohs(h->ip_len) < off + len) {
5131                         ACTION_SET(actionp, PF_DROP);
5132                         REASON_SET(reasonp, PFRES_SHORT);
5133                         return (NULL);
5134                 }
5135                 break;
5136         }
5137 #endif /* INET */
5138 #ifdef INET6
5139         case AF_INET6: {
5140                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5141
5142                 if (m->m_pkthdr.len < off + len ||
5143                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5144                     (unsigned)(off + len)) {
5145                         ACTION_SET(actionp, PF_DROP);
5146                         REASON_SET(reasonp, PFRES_SHORT);
5147                         return (NULL);
5148                 }
5149                 break;
5150         }
5151 #endif /* INET6 */
5152         }
5153         m_copydata(m, off, len, p);
5154         return (p);
5155 }
5156
5157 int
5158 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5159     int rtableid)
5160 {
5161 #ifdef RADIX_MPATH
5162         struct radix_node_head  *rnh;
5163 #endif
5164         struct sockaddr_in      *dst;
5165         int                      ret = 1;
5166         int                      check_mpath;
5167 #ifdef INET6
5168         struct sockaddr_in6     *dst6;
5169         struct route_in6         ro;
5170 #else
5171         struct route             ro;
5172 #endif
5173         struct radix_node       *rn;
5174         struct rtentry          *rt;
5175         struct ifnet            *ifp;
5176
5177         check_mpath = 0;
5178 #ifdef RADIX_MPATH
5179         /* XXX: stick to table 0 for now */
5180         rnh = rt_tables_get_rnh(0, af);
5181         if (rnh != NULL && rn_mpath_capable(rnh))
5182                 check_mpath = 1;
5183 #endif
5184         bzero(&ro, sizeof(ro));
5185         switch (af) {
5186         case AF_INET:
5187                 dst = satosin(&ro.ro_dst);
5188                 dst->sin_family = AF_INET;
5189                 dst->sin_len = sizeof(*dst);
5190                 dst->sin_addr = addr->v4;
5191                 break;
5192 #ifdef INET6
5193         case AF_INET6:
5194                 /*
5195                  * Skip check for addresses with embedded interface scope,
5196                  * as they would always match anyway.
5197                  */
5198                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5199                         goto out;
5200                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5201                 dst6->sin6_family = AF_INET6;
5202                 dst6->sin6_len = sizeof(*dst6);
5203                 dst6->sin6_addr = addr->v6;
5204                 break;
5205 #endif /* INET6 */
5206         default:
5207                 return (0);
5208         }
5209
5210         /* Skip checks for ipsec interfaces */
5211         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5212                 goto out;
5213
5214         switch (af) {
5215 #ifdef INET6
5216         case AF_INET6:
5217                 in6_rtalloc_ign(&ro, 0, rtableid);
5218                 break;
5219 #endif
5220 #ifdef INET
5221         case AF_INET:
5222                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5223                 break;
5224 #endif
5225         default:
5226                 rtalloc_ign((struct route *)&ro, 0);    /* No/default FIB. */
5227                 break;
5228         }
5229
5230         if (ro.ro_rt != NULL) {
5231                 /* No interface given, this is a no-route check */
5232                 if (kif == NULL)
5233                         goto out;
5234
5235                 if (kif->pfik_ifp == NULL) {
5236                         ret = 0;
5237                         goto out;
5238                 }
5239
5240                 /* Perform uRPF check if passed input interface */
5241                 ret = 0;
5242                 rn = (struct radix_node *)ro.ro_rt;
5243                 do {
5244                         rt = (struct rtentry *)rn;
5245                         ifp = rt->rt_ifp;
5246
5247                         if (kif->pfik_ifp == ifp)
5248                                 ret = 1;
5249 #ifdef RADIX_MPATH
5250                         rn = rn_mpath_next(rn);
5251 #endif
5252                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5253         } else
5254                 ret = 0;
5255 out:
5256         if (ro.ro_rt != NULL)
5257                 RTFREE(ro.ro_rt);
5258         return (ret);
5259 }
5260
5261 #ifdef INET
5262 static void
5263 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5264     struct pf_state *s, struct pf_pdesc *pd)
5265 {
5266         struct mbuf             *m0, *m1;
5267         struct sockaddr_in      dst;
5268         struct ip               *ip;
5269         struct ifnet            *ifp = NULL;
5270         struct pf_addr           naddr;
5271         struct pf_src_node      *sn = NULL;
5272         int                      error = 0;
5273         uint16_t                 ip_len, ip_off;
5274
5275         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5276         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5277             __func__));
5278
5279         if ((pd->pf_mtag == NULL &&
5280             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5281             pd->pf_mtag->routed++ > 3) {
5282                 m0 = *m;
5283                 *m = NULL;
5284                 goto bad_locked;
5285         }
5286
5287         if (r->rt == PF_DUPTO) {
5288                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5289                         if (s)
5290                                 PF_STATE_UNLOCK(s);
5291                         return;
5292                 }
5293         } else {
5294                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5295                         if (s)
5296                                 PF_STATE_UNLOCK(s);
5297                         return;
5298                 }
5299                 m0 = *m;
5300         }
5301
5302         ip = mtod(m0, struct ip *);
5303
5304         bzero(&dst, sizeof(dst));
5305         dst.sin_family = AF_INET;
5306         dst.sin_len = sizeof(dst);
5307         dst.sin_addr = ip->ip_dst;
5308
5309         if (r->rt == PF_FASTROUTE) {
5310                 struct rtentry *rt;
5311
5312                 if (s)
5313                         PF_STATE_UNLOCK(s);
5314                 rt = rtalloc1_fib(sintosa(&dst), 0, 0, M_GETFIB(m0));
5315                 if (rt == NULL) {
5316                         KMOD_IPSTAT_INC(ips_noroute);
5317                         error = EHOSTUNREACH;
5318                         goto bad;
5319                 }
5320
5321                 ifp = rt->rt_ifp;
5322                 counter_u64_add(rt->rt_pksent, 1);
5323
5324                 if (rt->rt_flags & RTF_GATEWAY)
5325                         bcopy(satosin(rt->rt_gateway), &dst, sizeof(dst));
5326                 RTFREE_LOCKED(rt);
5327         } else {
5328                 if (TAILQ_EMPTY(&r->rpool.list)) {
5329                         DPFPRINTF(PF_DEBUG_URGENT,
5330                             ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5331                         goto bad_locked;
5332                 }
5333                 if (s == NULL) {
5334                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5335                             &naddr, NULL, &sn);
5336                         if (!PF_AZERO(&naddr, AF_INET))
5337                                 dst.sin_addr.s_addr = naddr.v4.s_addr;
5338                         ifp = r->rpool.cur->kif ?
5339                             r->rpool.cur->kif->pfik_ifp : NULL;
5340                 } else {
5341                         if (!PF_AZERO(&s->rt_addr, AF_INET))
5342                                 dst.sin_addr.s_addr =
5343                                     s->rt_addr.v4.s_addr;
5344                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5345                         PF_STATE_UNLOCK(s);
5346                 }
5347         }
5348         if (ifp == NULL)
5349                 goto bad;
5350
5351         if (oifp != ifp) {
5352                 if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5353                         goto bad;
5354                 else if (m0 == NULL)
5355                         goto done;
5356                 if (m0->m_len < sizeof(struct ip)) {
5357                         DPFPRINTF(PF_DEBUG_URGENT,
5358                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5359                         goto bad;
5360                 }
5361                 ip = mtod(m0, struct ip *);
5362         }
5363
5364         if (ifp->if_flags & IFF_LOOPBACK)
5365                 m0->m_flags |= M_SKIP_FIREWALL;
5366
5367         ip_len = ntohs(ip->ip_len);
5368         ip_off = ntohs(ip->ip_off);
5369
5370         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5371         m0->m_pkthdr.csum_flags |= CSUM_IP;
5372         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5373                 in_delayed_cksum(m0);
5374                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5375         }
5376 #ifdef SCTP
5377         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5378                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5379                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5380         }
5381 #endif
5382
5383         /*
5384          * If small enough for interface, or the interface will take
5385          * care of the fragmentation for us, we can just send directly.
5386          */
5387         if (ip_len <= ifp->if_mtu ||
5388             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 ||
5389             ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) {
5390                 ip->ip_sum = 0;
5391                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5392                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5393                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5394                 }
5395                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5396                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5397                 goto done;
5398         }
5399
5400         /* Balk when DF bit is set or the interface didn't support TSO. */
5401         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5402                 error = EMSGSIZE;
5403                 KMOD_IPSTAT_INC(ips_cantfrag);
5404                 if (r->rt != PF_DUPTO) {
5405                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5406                             ifp->if_mtu);
5407                         goto done;
5408                 } else
5409                         goto bad;
5410         }
5411
5412         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5413         if (error)
5414                 goto bad;
5415
5416         for (; m0; m0 = m1) {
5417                 m1 = m0->m_nextpkt;
5418                 m0->m_nextpkt = NULL;
5419                 if (error == 0) {
5420                         m_clrprotoflags(m0);
5421                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5422                 } else
5423                         m_freem(m0);
5424         }
5425
5426         if (error == 0)
5427                 KMOD_IPSTAT_INC(ips_fragmented);
5428
5429 done:
5430         if (r->rt != PF_DUPTO)
5431                 *m = NULL;
5432         return;
5433
5434 bad_locked:
5435         if (s)
5436                 PF_STATE_UNLOCK(s);
5437 bad:
5438         m_freem(m0);
5439         goto done;
5440 }
5441 #endif /* INET */
5442
5443 #ifdef INET6
5444 static void
5445 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5446     struct pf_state *s, struct pf_pdesc *pd)
5447 {
5448         struct mbuf             *m0;
5449         struct sockaddr_in6     dst;
5450         struct ip6_hdr          *ip6;
5451         struct ifnet            *ifp = NULL;
5452         struct pf_addr           naddr;
5453         struct pf_src_node      *sn = NULL;
5454
5455         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5456         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5457             __func__));
5458
5459         if ((pd->pf_mtag == NULL &&
5460             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5461             pd->pf_mtag->routed++ > 3) {
5462                 m0 = *m;
5463                 *m = NULL;
5464                 goto bad_locked;
5465         }
5466
5467         if (r->rt == PF_DUPTO) {
5468                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5469                         if (s)
5470                                 PF_STATE_UNLOCK(s);
5471                         return;
5472                 }
5473         } else {
5474                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5475                         if (s)
5476                                 PF_STATE_UNLOCK(s);
5477                         return;
5478                 }
5479                 m0 = *m;
5480         }
5481
5482         ip6 = mtod(m0, struct ip6_hdr *);
5483
5484         bzero(&dst, sizeof(dst));
5485         dst.sin6_family = AF_INET6;
5486         dst.sin6_len = sizeof(dst);
5487         dst.sin6_addr = ip6->ip6_dst;
5488
5489         /* Cheat. XXX why only in the v6 case??? */
5490         if (r->rt == PF_FASTROUTE) {
5491                 if (s)
5492                         PF_STATE_UNLOCK(s);
5493                 m0->m_flags |= M_SKIP_FIREWALL;
5494                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
5495                 return;
5496         }
5497
5498         if (TAILQ_EMPTY(&r->rpool.list)) {
5499                 DPFPRINTF(PF_DEBUG_URGENT,
5500                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5501                 goto bad_locked;
5502         }
5503         if (s == NULL) {
5504                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5505                     &naddr, NULL, &sn);
5506                 if (!PF_AZERO(&naddr, AF_INET6))
5507                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5508                             &naddr, AF_INET6);
5509                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5510         } else {
5511                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5512                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5513                             &s->rt_addr, AF_INET6);
5514                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5515         }
5516
5517         if (s)
5518                 PF_STATE_UNLOCK(s);
5519
5520         if (ifp == NULL)
5521                 goto bad;
5522
5523         if (oifp != ifp) {
5524                 if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
5525                         goto bad;
5526                 else if (m0 == NULL)
5527                         goto done;
5528                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5529                         DPFPRINTF(PF_DEBUG_URGENT,
5530                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5531                             __func__));
5532                         goto bad;
5533                 }
5534                 ip6 = mtod(m0, struct ip6_hdr *);
5535         }
5536
5537         if (ifp->if_flags & IFF_LOOPBACK)
5538                 m0->m_flags |= M_SKIP_FIREWALL;
5539
5540         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5541             ~ifp->if_hwassist) {
5542                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5543                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5544                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5545         }
5546
5547         /*
5548          * If the packet is too large for the outgoing interface,
5549          * send back an icmp6 error.
5550          */
5551         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5552                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5553         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5554                 nd6_output(ifp, ifp, m0, &dst, NULL);
5555         else {
5556                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5557                 if (r->rt != PF_DUPTO)
5558                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5559                 else
5560                         goto bad;
5561         }
5562
5563 done:
5564         if (r->rt != PF_DUPTO)
5565                 *m = NULL;
5566         return;
5567
5568 bad_locked:
5569         if (s)
5570                 PF_STATE_UNLOCK(s);
5571 bad:
5572         m_freem(m0);
5573         goto done;
5574 }
5575 #endif /* INET6 */
5576
5577 /*
5578  * FreeBSD supports cksum offloads for the following drivers.
5579  *  em(4), fxp(4), ixgb(4), lge(4), ndis(4), nge(4), re(4),
5580  *   ti(4), txp(4), xl(4)
5581  *
5582  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5583  *  network driver performed cksum including pseudo header, need to verify
5584  *   csum_data
5585  * CSUM_DATA_VALID :
5586  *  network driver performed cksum, needs to additional pseudo header
5587  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5588  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5589  *
5590  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5591  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5592  * TCP/UDP layer.
5593  * Also, set csum_data to 0xffff to force cksum validation.
5594  */
5595 static int
5596 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5597 {
5598         u_int16_t sum = 0;
5599         int hw_assist = 0;
5600         struct ip *ip;
5601
5602         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5603                 return (1);
5604         if (m->m_pkthdr.len < off + len)
5605                 return (1);
5606
5607         switch (p) {
5608         case IPPROTO_TCP:
5609                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5610                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5611                                 sum = m->m_pkthdr.csum_data;
5612                         } else {
5613                                 ip = mtod(m, struct ip *);
5614                                 sum = in_pseudo(ip->ip_src.s_addr,
5615                                 ip->ip_dst.s_addr, htonl((u_short)len +
5616                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5617                         }
5618                         sum ^= 0xffff;
5619                         ++hw_assist;
5620                 }
5621                 break;
5622         case IPPROTO_UDP:
5623                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5624                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5625                                 sum = m->m_pkthdr.csum_data;
5626                         } else {
5627                                 ip = mtod(m, struct ip *);
5628                                 sum = in_pseudo(ip->ip_src.s_addr,
5629                                 ip->ip_dst.s_addr, htonl((u_short)len +
5630                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5631                         }
5632                         sum ^= 0xffff;
5633                         ++hw_assist;
5634                 }
5635                 break;
5636         case IPPROTO_ICMP:
5637 #ifdef INET6
5638         case IPPROTO_ICMPV6:
5639 #endif /* INET6 */
5640                 break;
5641         default:
5642                 return (1);
5643         }
5644
5645         if (!hw_assist) {
5646                 switch (af) {
5647                 case AF_INET:
5648                         if (p == IPPROTO_ICMP) {
5649                                 if (m->m_len < off)
5650                                         return (1);
5651                                 m->m_data += off;
5652                                 m->m_len -= off;
5653                                 sum = in_cksum(m, len);
5654                                 m->m_data -= off;
5655                                 m->m_len += off;
5656                         } else {
5657                                 if (m->m_len < sizeof(struct ip))
5658                                         return (1);
5659                                 sum = in4_cksum(m, p, off, len);
5660                         }
5661                         break;
5662 #ifdef INET6
5663                 case AF_INET6:
5664                         if (m->m_len < sizeof(struct ip6_hdr))
5665                                 return (1);
5666                         sum = in6_cksum(m, p, off, len);
5667                         break;
5668 #endif /* INET6 */
5669                 default:
5670                         return (1);
5671                 }
5672         }
5673         if (sum) {
5674                 switch (p) {
5675                 case IPPROTO_TCP:
5676                     {
5677                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5678                         break;
5679                     }
5680                 case IPPROTO_UDP:
5681                     {
5682                         KMOD_UDPSTAT_INC(udps_badsum);
5683                         break;
5684                     }
5685 #ifdef INET
5686                 case IPPROTO_ICMP:
5687                     {
5688                         KMOD_ICMPSTAT_INC(icps_checksum);
5689                         break;
5690                     }
5691 #endif
5692 #ifdef INET6
5693                 case IPPROTO_ICMPV6:
5694                     {
5695                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5696                         break;
5697                     }
5698 #endif /* INET6 */
5699                 }
5700                 return (1);
5701         } else {
5702                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5703                         m->m_pkthdr.csum_flags |=
5704                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5705                         m->m_pkthdr.csum_data = 0xffff;
5706                 }
5707         }
5708         return (0);
5709 }
5710
5711
5712 #ifdef INET
5713 int
5714 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5715 {
5716         struct pfi_kif          *kif;
5717         u_short                  action, reason = 0, log = 0;
5718         struct mbuf             *m = *m0;
5719         struct ip               *h = NULL;
5720         struct m_tag            *ipfwtag;
5721         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5722         struct pf_state         *s = NULL;
5723         struct pf_ruleset       *ruleset = NULL;
5724         struct pf_pdesc          pd;
5725         int                      off, dirndx, pqid = 0;
5726
5727         M_ASSERTPKTHDR(m);
5728
5729         if (!V_pf_status.running)
5730                 return (PF_PASS);
5731
5732         memset(&pd, 0, sizeof(pd));
5733
5734         kif = (struct pfi_kif *)ifp->if_pf_kif;
5735
5736         if (kif == NULL) {
5737                 DPFPRINTF(PF_DEBUG_URGENT,
5738                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5739                 return (PF_DROP);
5740         }
5741         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5742                 return (PF_PASS);
5743
5744         if (m->m_flags & M_SKIP_FIREWALL)
5745                 return (PF_PASS);
5746
5747         pd.pf_mtag = pf_find_mtag(m);
5748
5749         PF_RULES_RLOCK();
5750
5751         if (ip_divert_ptr != NULL &&
5752             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5753                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5754                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5755                         if (pd.pf_mtag == NULL &&
5756                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5757                                 action = PF_DROP;
5758                                 goto done;
5759                         }
5760                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5761                         m_tag_delete(m, ipfwtag);
5762                 }
5763                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5764                         m->m_flags |= M_FASTFWD_OURS;
5765                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5766                 }
5767         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5768                 /* We do IP header normalization and packet reassembly here */
5769                 action = PF_DROP;
5770                 goto done;
5771         }
5772         m = *m0;        /* pf_normalize messes with m0 */
5773         h = mtod(m, struct ip *);
5774
5775         off = h->ip_hl << 2;
5776         if (off < (int)sizeof(struct ip)) {
5777                 action = PF_DROP;
5778                 REASON_SET(&reason, PFRES_SHORT);
5779                 log = 1;
5780                 goto done;
5781         }
5782
5783         pd.src = (struct pf_addr *)&h->ip_src;
5784         pd.dst = (struct pf_addr *)&h->ip_dst;
5785         pd.sport = pd.dport = NULL;
5786         pd.ip_sum = &h->ip_sum;
5787         pd.proto_sum = NULL;
5788         pd.proto = h->ip_p;
5789         pd.dir = dir;
5790         pd.sidx = (dir == PF_IN) ? 0 : 1;
5791         pd.didx = (dir == PF_IN) ? 1 : 0;
5792         pd.af = AF_INET;
5793         pd.tos = h->ip_tos;
5794         pd.tot_len = ntohs(h->ip_len);
5795
5796         /* handle fragments that didn't get reassembled by normalization */
5797         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5798                 action = pf_test_fragment(&r, dir, kif, m, h,
5799                     &pd, &a, &ruleset);
5800                 goto done;
5801         }
5802
5803         switch (h->ip_p) {
5804
5805         case IPPROTO_TCP: {
5806                 struct tcphdr   th;
5807
5808                 pd.hdr.tcp = &th;
5809                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5810                     &action, &reason, AF_INET)) {
5811                         log = action != PF_PASS;
5812                         goto done;
5813                 }
5814                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5815                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5816                         pqid = 1;
5817                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5818                 if (action == PF_DROP)
5819                         goto done;
5820                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5821                     &reason);
5822                 if (action == PF_PASS) {
5823                         if (pfsync_update_state_ptr != NULL)
5824                                 pfsync_update_state_ptr(s);
5825                         r = s->rule.ptr;
5826                         a = s->anchor.ptr;
5827                         log = s->log;
5828                 } else if (s == NULL)
5829                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5830                             &a, &ruleset, inp);
5831                 break;
5832         }
5833
5834         case IPPROTO_UDP: {
5835                 struct udphdr   uh;
5836
5837                 pd.hdr.udp = &uh;
5838                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5839                     &action, &reason, AF_INET)) {
5840                         log = action != PF_PASS;
5841                         goto done;
5842                 }
5843                 if (uh.uh_dport == 0 ||
5844                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5845                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5846                         action = PF_DROP;
5847                         REASON_SET(&reason, PFRES_SHORT);
5848                         goto done;
5849                 }
5850                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
5851                 if (action == PF_PASS) {
5852                         if (pfsync_update_state_ptr != NULL)
5853                                 pfsync_update_state_ptr(s);
5854                         r = s->rule.ptr;
5855                         a = s->anchor.ptr;
5856                         log = s->log;
5857                 } else if (s == NULL)
5858                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5859                             &a, &ruleset, inp);
5860                 break;
5861         }
5862
5863         case IPPROTO_ICMP: {
5864                 struct icmp     ih;
5865
5866                 pd.hdr.icmp = &ih;
5867                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
5868                     &action, &reason, AF_INET)) {
5869                         log = action != PF_PASS;
5870                         goto done;
5871                 }
5872                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
5873                     &reason);
5874                 if (action == PF_PASS) {
5875                         if (pfsync_update_state_ptr != NULL)
5876                                 pfsync_update_state_ptr(s);
5877                         r = s->rule.ptr;
5878                         a = s->anchor.ptr;
5879                         log = s->log;
5880                 } else if (s == NULL)
5881                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5882                             &a, &ruleset, inp);
5883                 break;
5884         }
5885
5886 #ifdef INET6
5887         case IPPROTO_ICMPV6: {
5888                 action = PF_DROP;
5889                 DPFPRINTF(PF_DEBUG_MISC,
5890                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
5891                 goto done;
5892         }
5893 #endif
5894
5895         default:
5896                 action = pf_test_state_other(&s, dir, kif, m, &pd);
5897                 if (action == PF_PASS) {
5898                         if (pfsync_update_state_ptr != NULL)
5899                                 pfsync_update_state_ptr(s);
5900                         r = s->rule.ptr;
5901                         a = s->anchor.ptr;
5902                         log = s->log;
5903                 } else if (s == NULL)
5904                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5905                             &a, &ruleset, inp);
5906                 break;
5907         }
5908
5909 done:
5910         PF_RULES_RUNLOCK();
5911         if (action == PF_PASS && h->ip_hl > 5 &&
5912             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
5913                 action = PF_DROP;
5914                 REASON_SET(&reason, PFRES_IPOPTIONS);
5915                 log = 1;
5916                 DPFPRINTF(PF_DEBUG_MISC,
5917                     ("pf: dropping packet with ip options\n"));
5918         }
5919
5920         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
5921                 action = PF_DROP;
5922                 REASON_SET(&reason, PFRES_MEMORY);
5923         }
5924         if (r->rtableid >= 0)
5925                 M_SETFIB(m, r->rtableid);
5926
5927 #ifdef ALTQ
5928         if (action == PF_PASS && r->qid) {
5929                 if (pd.pf_mtag == NULL &&
5930                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5931                         action = PF_DROP;
5932                         REASON_SET(&reason, PFRES_MEMORY);
5933                 }
5934                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
5935                         pd.pf_mtag->qid = r->pqid;
5936                 else
5937                         pd.pf_mtag->qid = r->qid;
5938                 /* add hints for ecn */
5939                 pd.pf_mtag->hdr = h;
5940
5941         }
5942 #endif /* ALTQ */
5943
5944         /*
5945          * connections redirected to loopback should not match sockets
5946          * bound specifically to loopback due to security implications,
5947          * see tcp_input() and in_pcblookup_listen().
5948          */
5949         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
5950             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
5951             (s->nat_rule.ptr->action == PF_RDR ||
5952             s->nat_rule.ptr->action == PF_BINAT) &&
5953             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
5954                 m->m_flags |= M_SKIP_FIREWALL;
5955
5956         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
5957             !PACKET_LOOPED(&pd)) {
5958
5959                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
5960                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
5961                 if (ipfwtag != NULL) {
5962                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
5963                             ntohs(r->divert.port);
5964                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
5965
5966                         if (s)
5967                                 PF_STATE_UNLOCK(s);
5968
5969                         m_tag_prepend(m, ipfwtag);
5970                         if (m->m_flags & M_FASTFWD_OURS) {
5971                                 if (pd.pf_mtag == NULL &&
5972                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5973                                         action = PF_DROP;
5974                                         REASON_SET(&reason, PFRES_MEMORY);
5975                                         log = 1;
5976                                         DPFPRINTF(PF_DEBUG_MISC,
5977                                             ("pf: failed to allocate tag\n"));
5978                                 }
5979                                 pd.pf_mtag->flags |= PF_FASTFWD_OURS_PRESENT;
5980                                 m->m_flags &= ~M_FASTFWD_OURS;
5981                         }
5982                         ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
5983                         *m0 = NULL;
5984
5985                         return (action);
5986                 } else {
5987                         /* XXX: ipfw has the same behaviour! */
5988                         action = PF_DROP;
5989                         REASON_SET(&reason, PFRES_MEMORY);
5990                         log = 1;
5991                         DPFPRINTF(PF_DEBUG_MISC,
5992                             ("pf: failed to allocate divert tag\n"));
5993                 }
5994         }
5995
5996         if (log) {
5997                 struct pf_rule *lr;
5998
5999                 if (s != NULL && s->nat_rule.ptr != NULL &&
6000                     s->nat_rule.ptr->log & PF_LOG_ALL)
6001                         lr = s->nat_rule.ptr;
6002                 else
6003                         lr = r;
6004                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6005                     (s == NULL));
6006         }
6007
6008         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6009         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6010
6011         if (action == PF_PASS || r->action == PF_DROP) {
6012                 dirndx = (dir == PF_OUT);
6013                 r->packets[dirndx]++;
6014                 r->bytes[dirndx] += pd.tot_len;
6015                 if (a != NULL) {
6016                         a->packets[dirndx]++;
6017                         a->bytes[dirndx] += pd.tot_len;
6018                 }
6019                 if (s != NULL) {
6020                         if (s->nat_rule.ptr != NULL) {
6021                                 s->nat_rule.ptr->packets[dirndx]++;
6022                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6023                         }
6024                         if (s->src_node != NULL) {
6025                                 s->src_node->packets[dirndx]++;
6026                                 s->src_node->bytes[dirndx] += pd.tot_len;
6027                         }
6028                         if (s->nat_src_node != NULL) {
6029                                 s->nat_src_node->packets[dirndx]++;
6030                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6031                         }
6032                         dirndx = (dir == s->direction) ? 0 : 1;
6033                         s->packets[dirndx]++;
6034                         s->bytes[dirndx] += pd.tot_len;
6035                 }
6036                 tr = r;
6037                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6038                 if (nr != NULL && r == &V_pf_default_rule)
6039                         tr = nr;
6040                 if (tr->src.addr.type == PF_ADDR_TABLE)
6041                         pfr_update_stats(tr->src.addr.p.tbl,
6042                             (s == NULL) ? pd.src :
6043                             &s->key[(s->direction == PF_IN)]->
6044                                 addr[(s->direction == PF_OUT)],
6045                             pd.af, pd.tot_len, dir == PF_OUT,
6046                             r->action == PF_PASS, tr->src.neg);
6047                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6048                         pfr_update_stats(tr->dst.addr.p.tbl,
6049                             (s == NULL) ? pd.dst :
6050                             &s->key[(s->direction == PF_IN)]->
6051                                 addr[(s->direction == PF_IN)],
6052                             pd.af, pd.tot_len, dir == PF_OUT,
6053                             r->action == PF_PASS, tr->dst.neg);
6054         }
6055
6056         switch (action) {
6057         case PF_SYNPROXY_DROP:
6058                 m_freem(*m0);
6059         case PF_DEFER:
6060                 *m0 = NULL;
6061                 action = PF_PASS;
6062                 break;
6063         case PF_DROP:
6064                 m_freem(*m0);
6065                 *m0 = NULL;
6066                 break;
6067         default:
6068                 /* pf_route() returns unlocked. */
6069                 if (r->rt) {
6070                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6071                         return (action);
6072                 }
6073                 break;
6074         }
6075         if (s)
6076                 PF_STATE_UNLOCK(s);
6077
6078         return (action);
6079 }
6080 #endif /* INET */
6081
6082 #ifdef INET6
6083 int
6084 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6085 {
6086         struct pfi_kif          *kif;
6087         u_short                  action, reason = 0, log = 0;
6088         struct mbuf             *m = *m0, *n = NULL;
6089         struct ip6_hdr          *h = NULL;
6090         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6091         struct pf_state         *s = NULL;
6092         struct pf_ruleset       *ruleset = NULL;
6093         struct pf_pdesc          pd;
6094         int                      off, terminal = 0, dirndx, rh_cnt = 0;
6095
6096         M_ASSERTPKTHDR(m);
6097
6098         if (!V_pf_status.running)
6099                 return (PF_PASS);
6100
6101         memset(&pd, 0, sizeof(pd));
6102         pd.pf_mtag = pf_find_mtag(m);
6103
6104         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6105                 return (PF_PASS);
6106
6107         kif = (struct pfi_kif *)ifp->if_pf_kif;
6108         if (kif == NULL) {
6109                 DPFPRINTF(PF_DEBUG_URGENT,
6110                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6111                 return (PF_DROP);
6112         }
6113         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6114                 return (PF_PASS);
6115
6116         if (m->m_flags & M_SKIP_FIREWALL)
6117                 return (PF_PASS);
6118
6119         PF_RULES_RLOCK();
6120
6121         /* We do IP header normalization and packet reassembly here */
6122         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6123                 action = PF_DROP;
6124                 goto done;
6125         }
6126         m = *m0;        /* pf_normalize messes with m0 */
6127         h = mtod(m, struct ip6_hdr *);
6128
6129 #if 1
6130         /*
6131          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6132          * will do something bad, so drop the packet for now.
6133          */
6134         if (htons(h->ip6_plen) == 0) {
6135                 action = PF_DROP;
6136                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6137                 goto done;
6138         }
6139 #endif
6140
6141         pd.src = (struct pf_addr *)&h->ip6_src;
6142         pd.dst = (struct pf_addr *)&h->ip6_dst;
6143         pd.sport = pd.dport = NULL;
6144         pd.ip_sum = NULL;
6145         pd.proto_sum = NULL;
6146         pd.dir = dir;
6147         pd.sidx = (dir == PF_IN) ? 0 : 1;
6148         pd.didx = (dir == PF_IN) ? 1 : 0;
6149         pd.af = AF_INET6;
6150         pd.tos = 0;
6151         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6152
6153         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6154         pd.proto = h->ip6_nxt;
6155         do {
6156                 switch (pd.proto) {
6157                 case IPPROTO_FRAGMENT:
6158                         action = pf_test_fragment(&r, dir, kif, m, h,
6159                             &pd, &a, &ruleset);
6160                         if (action == PF_DROP)
6161                                 REASON_SET(&reason, PFRES_FRAG);
6162                         goto done;
6163                 case IPPROTO_ROUTING: {
6164                         struct ip6_rthdr rthdr;
6165
6166                         if (rh_cnt++) {
6167                                 DPFPRINTF(PF_DEBUG_MISC,
6168                                     ("pf: IPv6 more than one rthdr\n"));
6169                                 action = PF_DROP;
6170                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6171                                 log = 1;
6172                                 goto done;
6173                         }
6174                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6175                             &reason, pd.af)) {
6176                                 DPFPRINTF(PF_DEBUG_MISC,
6177                                     ("pf: IPv6 short rthdr\n"));
6178                                 action = PF_DROP;
6179                                 REASON_SET(&reason, PFRES_SHORT);
6180                                 log = 1;
6181                                 goto done;
6182                         }
6183                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6184                                 DPFPRINTF(PF_DEBUG_MISC,
6185                                     ("pf: IPv6 rthdr0\n"));
6186                                 action = PF_DROP;
6187                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6188                                 log = 1;
6189                                 goto done;
6190                         }
6191                         /* FALLTHROUGH */
6192                 }
6193                 case IPPROTO_AH:
6194                 case IPPROTO_HOPOPTS:
6195                 case IPPROTO_DSTOPTS: {
6196                         /* get next header and header length */
6197                         struct ip6_ext  opt6;
6198
6199                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6200                             NULL, &reason, pd.af)) {
6201                                 DPFPRINTF(PF_DEBUG_MISC,
6202                                     ("pf: IPv6 short opt\n"));
6203                                 action = PF_DROP;
6204                                 log = 1;
6205                                 goto done;
6206                         }
6207                         if (pd.proto == IPPROTO_AH)
6208                                 off += (opt6.ip6e_len + 2) * 4;
6209                         else
6210                                 off += (opt6.ip6e_len + 1) * 8;
6211                         pd.proto = opt6.ip6e_nxt;
6212                         /* goto the next header */
6213                         break;
6214                 }
6215                 default:
6216                         terminal++;
6217                         break;
6218                 }
6219         } while (!terminal);
6220
6221         /* if there's no routing header, use unmodified mbuf for checksumming */
6222         if (!n)
6223                 n = m;
6224
6225         switch (pd.proto) {
6226
6227         case IPPROTO_TCP: {
6228                 struct tcphdr   th;
6229
6230                 pd.hdr.tcp = &th;
6231                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6232                     &action, &reason, AF_INET6)) {
6233                         log = action != PF_PASS;
6234                         goto done;
6235                 }
6236                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6237                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6238                 if (action == PF_DROP)
6239                         goto done;
6240                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6241                     &reason);
6242                 if (action == PF_PASS) {
6243                         if (pfsync_update_state_ptr != NULL)
6244                                 pfsync_update_state_ptr(s);
6245                         r = s->rule.ptr;
6246                         a = s->anchor.ptr;
6247                         log = s->log;
6248                 } else if (s == NULL)
6249                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6250                             &a, &ruleset, inp);
6251                 break;
6252         }
6253
6254         case IPPROTO_UDP: {
6255                 struct udphdr   uh;
6256
6257                 pd.hdr.udp = &uh;
6258                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6259                     &action, &reason, AF_INET6)) {
6260                         log = action != PF_PASS;
6261                         goto done;
6262                 }
6263                 if (uh.uh_dport == 0 ||
6264                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6265                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6266                         action = PF_DROP;
6267                         REASON_SET(&reason, PFRES_SHORT);
6268                         goto done;
6269                 }
6270                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6271                 if (action == PF_PASS) {
6272                         if (pfsync_update_state_ptr != NULL)
6273                                 pfsync_update_state_ptr(s);
6274                         r = s->rule.ptr;
6275                         a = s->anchor.ptr;
6276                         log = s->log;
6277                 } else if (s == NULL)
6278                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6279                             &a, &ruleset, inp);
6280                 break;
6281         }
6282
6283         case IPPROTO_ICMP: {
6284                 action = PF_DROP;
6285                 DPFPRINTF(PF_DEBUG_MISC,
6286                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6287                 goto done;
6288         }
6289
6290         case IPPROTO_ICMPV6: {
6291                 struct icmp6_hdr        ih;
6292
6293                 pd.hdr.icmp6 = &ih;
6294                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6295                     &action, &reason, AF_INET6)) {
6296                         log = action != PF_PASS;
6297                         goto done;
6298                 }
6299                 action = pf_test_state_icmp(&s, dir, kif,
6300                     m, off, h, &pd, &reason);
6301                 if (action == PF_PASS) {
6302                         if (pfsync_update_state_ptr != NULL)
6303                                 pfsync_update_state_ptr(s);
6304                         r = s->rule.ptr;
6305                         a = s->anchor.ptr;
6306                         log = s->log;
6307                 } else if (s == NULL)
6308                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6309                             &a, &ruleset, inp);
6310                 break;
6311         }
6312
6313         default:
6314                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6315                 if (action == PF_PASS) {
6316                         if (pfsync_update_state_ptr != NULL)
6317                                 pfsync_update_state_ptr(s);
6318                         r = s->rule.ptr;
6319                         a = s->anchor.ptr;
6320                         log = s->log;
6321                 } else if (s == NULL)
6322                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6323                             &a, &ruleset, inp);
6324                 break;
6325         }
6326
6327 done:
6328         PF_RULES_RUNLOCK();
6329         if (n != m) {
6330                 m_freem(n);
6331                 n = NULL;
6332         }
6333
6334         /* handle dangerous IPv6 extension headers. */
6335         if (action == PF_PASS && rh_cnt &&
6336             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6337                 action = PF_DROP;
6338                 REASON_SET(&reason, PFRES_IPOPTIONS);
6339                 log = 1;
6340                 DPFPRINTF(PF_DEBUG_MISC,
6341                     ("pf: dropping packet with dangerous v6 headers\n"));
6342         }
6343
6344         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6345                 action = PF_DROP;
6346                 REASON_SET(&reason, PFRES_MEMORY);
6347         }
6348         if (r->rtableid >= 0)
6349                 M_SETFIB(m, r->rtableid);
6350
6351 #ifdef ALTQ
6352         if (action == PF_PASS && r->qid) {
6353                 if (pd.pf_mtag == NULL &&
6354                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6355                         action = PF_DROP;
6356                         REASON_SET(&reason, PFRES_MEMORY);
6357                 }
6358                 if (pd.tos & IPTOS_LOWDELAY)
6359                         pd.pf_mtag->qid = r->pqid;
6360                 else
6361                         pd.pf_mtag->qid = r->qid;
6362                 /* add hints for ecn */
6363                 pd.pf_mtag->hdr = h;
6364         }
6365 #endif /* ALTQ */
6366
6367         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6368             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6369             (s->nat_rule.ptr->action == PF_RDR ||
6370             s->nat_rule.ptr->action == PF_BINAT) &&
6371             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6372                 m->m_flags |= M_SKIP_FIREWALL;
6373
6374         /* XXX: Anybody working on it?! */
6375         if (r->divert.port)
6376                 printf("pf: divert(9) is not supported for IPv6\n");
6377
6378         if (log) {
6379                 struct pf_rule *lr;
6380
6381                 if (s != NULL && s->nat_rule.ptr != NULL &&
6382                     s->nat_rule.ptr->log & PF_LOG_ALL)
6383                         lr = s->nat_rule.ptr;
6384                 else
6385                         lr = r;
6386                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6387                     &pd, (s == NULL));
6388         }
6389
6390         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6391         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6392
6393         if (action == PF_PASS || r->action == PF_DROP) {
6394                 dirndx = (dir == PF_OUT);
6395                 r->packets[dirndx]++;
6396                 r->bytes[dirndx] += pd.tot_len;
6397                 if (a != NULL) {
6398                         a->packets[dirndx]++;
6399                         a->bytes[dirndx] += pd.tot_len;
6400                 }
6401                 if (s != NULL) {
6402                         if (s->nat_rule.ptr != NULL) {
6403                                 s->nat_rule.ptr->packets[dirndx]++;
6404                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6405                         }
6406                         if (s->src_node != NULL) {
6407                                 s->src_node->packets[dirndx]++;
6408                                 s->src_node->bytes[dirndx] += pd.tot_len;
6409                         }
6410                         if (s->nat_src_node != NULL) {
6411                                 s->nat_src_node->packets[dirndx]++;
6412                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6413                         }
6414                         dirndx = (dir == s->direction) ? 0 : 1;
6415                         s->packets[dirndx]++;
6416                         s->bytes[dirndx] += pd.tot_len;
6417                 }
6418                 tr = r;
6419                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6420                 if (nr != NULL && r == &V_pf_default_rule)
6421                         tr = nr;
6422                 if (tr->src.addr.type == PF_ADDR_TABLE)
6423                         pfr_update_stats(tr->src.addr.p.tbl,
6424                             (s == NULL) ? pd.src :
6425                             &s->key[(s->direction == PF_IN)]->addr[0],
6426                             pd.af, pd.tot_len, dir == PF_OUT,
6427                             r->action == PF_PASS, tr->src.neg);
6428                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6429                         pfr_update_stats(tr->dst.addr.p.tbl,
6430                             (s == NULL) ? pd.dst :
6431                             &s->key[(s->direction == PF_IN)]->addr[1],
6432                             pd.af, pd.tot_len, dir == PF_OUT,
6433                             r->action == PF_PASS, tr->dst.neg);
6434         }
6435
6436         switch (action) {
6437         case PF_SYNPROXY_DROP:
6438                 m_freem(*m0);
6439         case PF_DEFER:
6440                 *m0 = NULL;
6441                 action = PF_PASS;
6442                 break;
6443         case PF_DROP:
6444                 m_freem(*m0);
6445                 *m0 = NULL;
6446                 break;
6447         default:
6448                 /* pf_route6() returns unlocked. */
6449                 if (r->rt) {
6450                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6451                         return (action);
6452                 }
6453                 break;
6454         }
6455
6456         if (s)
6457                 PF_STATE_UNLOCK(s);
6458
6459         return (action);
6460 }
6461 #endif /* INET6 */