sys/netpfil/pf/pf.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2001 Daniel Hartmeier
   5  * Copyright (c) 2002 - 2008 Henning Brauer
   6  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  *    - Redistributions of source code must retain the above copyright
  14  *      notice, this list of conditions and the following disclaimer.
  15  *    - Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials provided
  18  *      with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * Effort sponsored in part by the Defense Advanced Research Projects
  34  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  35  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  36  *
  37  *      $OpenBSD: pf.c,v 1.634 2009/02/27 12:37:45 henning Exp $
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_bpf.h"
  46 #include "opt_pf.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/bus.h>
  50 #include <sys/endian.h>
  51 #include <sys/hash.h>
  52 #include <sys/interrupt.h>
  53 #include <sys/kernel.h>
  54 #include <sys/kthread.h>
  55 #include <sys/limits.h>
  56 #include <sys/mbuf.h>
  57 #include <sys/md5.h>
  58 #include <sys/random.h>
  59 #include <sys/refcount.h>
  60 #include <sys/socket.h>
  61 #include <sys/sysctl.h>
  62 #include <sys/taskqueue.h>
  63 #include <sys/ucred.h>
  64
  65 #include <net/if.h>
  66 #include <net/if_var.h>
  67 #include <net/if_types.h>
  68 #include <net/if_vlan_var.h>
  69 #include <net/route.h>
  70 #include <net/radix_mpath.h>
  71 #include <net/vnet.h>
  72
  73 #include <net/pfil.h>
  74 #include <net/pfvar.h>
  75 #include <net/if_pflog.h>
  76 #include <net/if_pfsync.h>
  77
  78 #include <netinet/in_pcb.h>
  79 #include <netinet/in_var.h>
  80 #include <netinet/in_fib.h>
  81 #include <netinet/ip.h>
  82 #include <netinet/ip_fw.h>
  83 #include <netinet/ip_icmp.h>
  84 #include <netinet/icmp_var.h>
  85 #include <netinet/ip_var.h>
  86 #include <netinet/tcp.h>
  87 #include <netinet/tcp_fsm.h>
  88 #include <netinet/tcp_seq.h>
  89 #include <netinet/tcp_timer.h>
  90 #include <netinet/tcp_var.h>
  91 #include <netinet/udp.h>
  92 #include <netinet/udp_var.h>
  93
  94 #include <netpfil/ipfw/ip_fw_private.h> /* XXX: only for DIR_IN/DIR_OUT */
  95
  96 #ifdef INET6
  97 #include <netinet/ip6.h>
  98 #include <netinet/icmp6.h>
  99 #include <netinet6/nd6.h>
 100 #include <netinet6/ip6_var.h>
 101 #include <netinet6/in6_pcb.h>
 102 #include <netinet6/in6_fib.h>
 103 #include <netinet6/scope6_var.h>
 104 #endif /* INET6 */
 105
 106 #include <machine/in_cksum.h>
 107 #include <security/mac/mac_framework.h>
 108
 109 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
 110
 111 /*
 112  * Global variables
 113  */
 114
 115 /* state tables */
 116 VNET_DEFINE(struct pf_altqqueue,         pf_altqs[2]);
 117 VNET_DEFINE(struct pf_palist,            pf_pabuf);
 118 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_active);
 119 VNET_DEFINE(struct pf_altqqueue *,       pf_altqs_inactive);
 120 VNET_DEFINE(struct pf_kstatus,           pf_status);
 121
 122 VNET_DEFINE(u_int32_t,                   ticket_altqs_active);
 123 VNET_DEFINE(u_int32_t,                   ticket_altqs_inactive);
 124 VNET_DEFINE(int,                         altqs_inactive_open);
 125 VNET_DEFINE(u_int32_t,                   ticket_pabuf);
 126
 127 VNET_DEFINE(MD5_CTX,                     pf_tcp_secret_ctx);
 128 #define V_pf_tcp_secret_ctx              VNET(pf_tcp_secret_ctx)
 129 VNET_DEFINE(u_char,                      pf_tcp_secret[16]);
 130 #define V_pf_tcp_secret                  VNET(pf_tcp_secret)
 131 VNET_DEFINE(int,                         pf_tcp_secret_init);
 132 #define V_pf_tcp_secret_init             VNET(pf_tcp_secret_init)
 133 VNET_DEFINE(int,                         pf_tcp_iss_off);
 134 #define V_pf_tcp_iss_off                 VNET(pf_tcp_iss_off)
 135 VNET_DECLARE(int,                        pf_vnet_active);
 136 #define V_pf_vnet_active                 VNET(pf_vnet_active)
 137
 138 VNET_DEFINE_STATIC(uint32_t, pf_purge_idx);
 139 #define V_pf_purge_idx  VNET(pf_purge_idx)
 140
 141 /*
 142  * Queue for pf_intr() sends.
 143  */
 144 static MALLOC_DEFINE(M_PFTEMP, "pf_temp", "pf(4) temporary allocations");
 145 struct pf_send_entry {
 146         STAILQ_ENTRY(pf_send_entry)     pfse_next;
 147         struct mbuf                     *pfse_m;
 148         enum {
 149                 PFSE_IP,
 150                 PFSE_IP6,
 151                 PFSE_ICMP,
 152                 PFSE_ICMP6,
 153         }                               pfse_type;
 154         struct {
 155                 int             type;
 156                 int             code;
 157                 int             mtu;
 158         } icmpopts;
 159 };
 160
 161 STAILQ_HEAD(pf_send_head, pf_send_entry);
 162 VNET_DEFINE_STATIC(struct pf_send_head, pf_sendqueue);
 163 #define V_pf_sendqueue  VNET(pf_sendqueue)
 164
 165 static struct mtx pf_sendqueue_mtx;
 166 MTX_SYSINIT(pf_sendqueue_mtx, &pf_sendqueue_mtx, "pf send queue", MTX_DEF);
 167 #define PF_SENDQ_LOCK()         mtx_lock(&pf_sendqueue_mtx)
 168 #define PF_SENDQ_UNLOCK()       mtx_unlock(&pf_sendqueue_mtx)
 169
 170 /*
 171  * Queue for pf_overload_task() tasks.
 172  */
 173 struct pf_overload_entry {
 174         SLIST_ENTRY(pf_overload_entry)  next;
 175         struct pf_addr                  addr;
 176         sa_family_t                     af;
 177         uint8_t                         dir;
 178         struct pf_rule                  *rule;
 179 };
 180
 181 SLIST_HEAD(pf_overload_head, pf_overload_entry);
 182 VNET_DEFINE_STATIC(struct pf_overload_head, pf_overloadqueue);
 183 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 184 VNET_DEFINE_STATIC(struct task, pf_overloadtask);
 185 #define V_pf_overloadtask       VNET(pf_overloadtask)
 186
 187 static struct mtx pf_overloadqueue_mtx;
 188 MTX_SYSINIT(pf_overloadqueue_mtx, &pf_overloadqueue_mtx,
 189     "pf overload/flush queue", MTX_DEF);
 190 #define PF_OVERLOADQ_LOCK()     mtx_lock(&pf_overloadqueue_mtx)
 191 #define PF_OVERLOADQ_UNLOCK()   mtx_unlock(&pf_overloadqueue_mtx)
 192
 193 VNET_DEFINE(struct pf_rulequeue, pf_unlinked_rules);
 194 struct mtx pf_unlnkdrules_mtx;
 195 MTX_SYSINIT(pf_unlnkdrules_mtx, &pf_unlnkdrules_mtx, "pf unlinked rules",
 196     MTX_DEF);
 197
 198 VNET_DEFINE_STATIC(uma_zone_t,  pf_sources_z);
 199 #define V_pf_sources_z  VNET(pf_sources_z)
 200 uma_zone_t              pf_mtag_z;
 201 VNET_DEFINE(uma_zone_t,  pf_state_z);
 202 VNET_DEFINE(uma_zone_t,  pf_state_key_z);
 203
 204 VNET_DEFINE(uint64_t, pf_stateid[MAXCPU]);
 205 #define PFID_CPUBITS    8
 206 #define PFID_CPUSHIFT   (sizeof(uint64_t) * NBBY - PFID_CPUBITS)
 207 #define PFID_CPUMASK    ((uint64_t)((1 << PFID_CPUBITS) - 1) << PFID_CPUSHIFT)
 208 #define PFID_MAXID      (~PFID_CPUMASK)
 209 CTASSERT((1 << PFID_CPUBITS) >= MAXCPU);
 210
 211 static void              pf_src_tree_remove_state(struct pf_state *);
 212 static void              pf_init_threshold(struct pf_threshold *, u_int32_t,
 213                             u_int32_t);
 214 static void              pf_add_threshold(struct pf_threshold *);
 215 static int               pf_check_threshold(struct pf_threshold *);
 216
 217 static void              pf_change_ap(struct mbuf *, struct pf_addr *, u_int16_t *,
 218                             u_int16_t *, u_int16_t *, struct pf_addr *,
 219                             u_int16_t, u_int8_t, sa_family_t);
 220 static int               pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
 221                             struct tcphdr *, struct pf_state_peer *);
 222 static void              pf_change_icmp(struct pf_addr *, u_int16_t *,
 223                             struct pf_addr *, struct pf_addr *, u_int16_t,
 224                             u_int16_t *, u_int16_t *, u_int16_t *,
 225                             u_int16_t *, u_int8_t, sa_family_t);
 226 static void              pf_send_tcp(struct mbuf *,
 227                             const struct pf_rule *, sa_family_t,
 228                             const struct pf_addr *, const struct pf_addr *,
 229                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
 230                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
 231                             u_int16_t, struct ifnet *);
 232 static void              pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
 233                             sa_family_t, struct pf_rule *);
 234 static void              pf_detach_state(struct pf_state *);
 235 static int               pf_state_key_attach(struct pf_state_key *,
 236                             struct pf_state_key *, struct pf_state *);
 237 static void              pf_state_key_detach(struct pf_state *, int);
 238 static int               pf_state_key_ctor(void *, int, void *, int);
 239 static u_int32_t         pf_tcp_iss(struct pf_pdesc *);
 240 static int               pf_test_rule(struct pf_rule **, struct pf_state **,
 241                             int, struct pfi_kif *, struct mbuf *, int,
 242                             struct pf_pdesc *, struct pf_rule **,
 243                             struct pf_ruleset **, struct inpcb *);
 244 static int               pf_create_state(struct pf_rule *, struct pf_rule *,
 245                             struct pf_rule *, struct pf_pdesc *,
 246                             struct pf_src_node *, struct pf_state_key *,
 247                             struct pf_state_key *, struct mbuf *, int,
 248                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
 249                             struct pf_state **, int, u_int16_t, u_int16_t,
 250                             int);
 251 static int               pf_test_fragment(struct pf_rule **, int,
 252                             struct pfi_kif *, struct mbuf *, void *,
 253                             struct pf_pdesc *, struct pf_rule **,
 254                             struct pf_ruleset **);
 255 static int               pf_tcp_track_full(struct pf_state_peer *,
 256                             struct pf_state_peer *, struct pf_state **,
 257                             struct pfi_kif *, struct mbuf *, int,
 258                             struct pf_pdesc *, u_short *, int *);
 259 static int               pf_tcp_track_sloppy(struct pf_state_peer *,
 260                             struct pf_state_peer *, struct pf_state **,
 261                             struct pf_pdesc *, u_short *);
 262 static int               pf_test_state_tcp(struct pf_state **, int,
 263                             struct pfi_kif *, struct mbuf *, int,
 264                             void *, struct pf_pdesc *, u_short *);
 265 static int               pf_test_state_udp(struct pf_state **, int,
 266                             struct pfi_kif *, struct mbuf *, int,
 267                             void *, struct pf_pdesc *);
 268 static int               pf_test_state_icmp(struct pf_state **, int,
 269                             struct pfi_kif *, struct mbuf *, int,
 270                             void *, struct pf_pdesc *, u_short *);
 271 static int               pf_test_state_other(struct pf_state **, int,
 272                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
 273 static u_int8_t          pf_get_wscale(struct mbuf *, int, u_int16_t,
 274                             sa_family_t);
 275 static u_int16_t         pf_get_mss(struct mbuf *, int, u_int16_t,
 276                             sa_family_t);
 277 static u_int16_t         pf_calc_mss(struct pf_addr *, sa_family_t,
 278                                 int, u_int16_t);
 279 static int               pf_check_proto_cksum(struct mbuf *, int, int,
 280                             u_int8_t, sa_family_t);
 281 static void              pf_print_state_parts(struct pf_state *,
 282                             struct pf_state_key *, struct pf_state_key *);
 283 static int               pf_addr_wrap_neq(struct pf_addr_wrap *,
 284                             struct pf_addr_wrap *);
 285 static struct pf_state  *pf_find_state(struct pfi_kif *,
 286                             struct pf_state_key_cmp *, u_int);
 287 static int               pf_src_connlimit(struct pf_state **);
 288 static void              pf_overload_task(void *v, int pending);
 289 static int               pf_insert_src_node(struct pf_src_node **,
 290                             struct pf_rule *, struct pf_addr *, sa_family_t);
 291 static u_int             pf_purge_expired_states(u_int, int);
 292 static void              pf_purge_unlinked_rules(void);
 293 static int               pf_mtag_uminit(void *, int, int);
 294 static void              pf_mtag_free(struct m_tag *);
 295 #ifdef INET
 296 static void              pf_route(struct mbuf **, struct pf_rule *, int,
 297                             struct ifnet *, struct pf_state *,
 298                             struct pf_pdesc *, struct inpcb *);
 299 #endif /* INET */
 300 #ifdef INET6
 301 static void              pf_change_a6(struct pf_addr *, u_int16_t *,
 302                             struct pf_addr *, u_int8_t);
 303 static void              pf_route6(struct mbuf **, struct pf_rule *, int,
 304                             struct ifnet *, struct pf_state *,
 305                             struct pf_pdesc *, struct inpcb *);
 306 #endif /* INET6 */
 307
 308 int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
 309
 310 extern int pf_end_threads;
 311 extern struct proc *pf_purge_proc;
 312
 313 VNET_DEFINE(struct pf_limit, pf_limits[PF_LIMIT_MAX]);
 314
 315 #define PACKET_LOOPED(pd)       ((pd)->pf_mtag &&                       \
 316                                  (pd)->pf_mtag->flags & PF_PACKET_LOOPED)
 317
 318 #define STATE_LOOKUP(i, k, d, s, pd)                                    \
 319         do {                                                            \
 320                 (s) = pf_find_state((i), (k), (d));                     \
 321                 if ((s) == NULL)                                        \
 322                         return (PF_DROP);                               \
 323                 if (PACKET_LOOPED(pd))                                  \
 324                         return (PF_PASS);                               \
 325                 if ((d) == PF_OUT &&                                    \
 326                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
 327                     (s)->rule.ptr->direction == PF_OUT) ||              \
 328                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
 329                     (s)->rule.ptr->direction == PF_IN)) &&              \
 330                     (s)->rt_kif != NULL &&                              \
 331                     (s)->rt_kif != (i))                                 \
 332                         return (PF_PASS);                               \
 333         } while (0)
 334
 335 #define BOUND_IFACE(r, k) \
 336         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : V_pfi_all
 337
 338 #define STATE_INC_COUNTERS(s)                                           \
 339         do {                                                            \
 340                 counter_u64_add(s->rule.ptr->states_cur, 1);            \
 341                 counter_u64_add(s->rule.ptr->states_tot, 1);            \
 342                 if (s->anchor.ptr != NULL) {                            \
 343                         counter_u64_add(s->anchor.ptr->states_cur, 1);  \
 344                         counter_u64_add(s->anchor.ptr->states_tot, 1);  \
 345                 }                                                       \
 346                 if (s->nat_rule.ptr != NULL) {                          \
 347                         counter_u64_add(s->nat_rule.ptr->states_cur, 1);\
 348                         counter_u64_add(s->nat_rule.ptr->states_tot, 1);\
 349                 }                                                       \
 350         } while (0)
 351
 352 #define STATE_DEC_COUNTERS(s)                                           \
 353         do {                                                            \
 354                 if (s->nat_rule.ptr != NULL)                            \
 355                         counter_u64_add(s->nat_rule.ptr->states_cur, -1);\
 356                 if (s->anchor.ptr != NULL)                              \
 357                         counter_u64_add(s->anchor.ptr->states_cur, -1); \
 358                 counter_u64_add(s->rule.ptr->states_cur, -1);           \
 359         } while (0)
 360
 361 static MALLOC_DEFINE(M_PFHASH, "pf_hash", "pf(4) hash header structures");
 362 VNET_DEFINE(struct pf_keyhash *, pf_keyhash);
 363 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 364 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 365
 366 SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
 367
 368 u_long  pf_hashmask;
 369 u_long  pf_srchashmask;
 370 static u_long   pf_hashsize;
 371 static u_long   pf_srchashsize;
 372 u_long  pf_ioctl_maxcount = 65535;
 373
 374 SYSCTL_ULONG(_net_pf, OID_AUTO, states_hashsize, CTLFLAG_RDTUN,
 375     &pf_hashsize, 0, "Size of pf(4) states hashtable");
 376 SYSCTL_ULONG(_net_pf, OID_AUTO, source_nodes_hashsize, CTLFLAG_RDTUN,
 377     &pf_srchashsize, 0, "Size of pf(4) source nodes hashtable");
 378 SYSCTL_ULONG(_net_pf, OID_AUTO, request_maxcount, CTLFLAG_RDTUN,
 379     &pf_ioctl_maxcount, 0, "Maximum number of tables, addresses, ... in a single ioctl() call");
 380
 381 VNET_DEFINE(void *, pf_swi_cookie);
 382
 383 VNET_DEFINE(uint32_t, pf_hashseed);
 384 #define V_pf_hashseed   VNET(pf_hashseed)
 385
 386 int
 387 pf_addr_cmp(struct pf_addr *a, struct pf_addr *b, sa_family_t af)
 388 {
 389
 390         switch (af) {
 391 #ifdef INET
 392         case AF_INET:
 393                 if (a->addr32[0] > b->addr32[0])
 394                         return (1);
 395                 if (a->addr32[0] < b->addr32[0])
 396                         return (-1);
 397                 break;
 398 #endif /* INET */
 399 #ifdef INET6
 400         case AF_INET6:
 401                 if (a->addr32[3] > b->addr32[3])
 402                         return (1);
 403                 if (a->addr32[3] < b->addr32[3])
 404                         return (-1);
 405                 if (a->addr32[2] > b->addr32[2])
 406                         return (1);
 407                 if (a->addr32[2] < b->addr32[2])
 408                         return (-1);
 409                 if (a->addr32[1] > b->addr32[1])
 410                         return (1);
 411                 if (a->addr32[1] < b->addr32[1])
 412                         return (-1);
 413                 if (a->addr32[0] > b->addr32[0])
 414                         return (1);
 415                 if (a->addr32[0] < b->addr32[0])
 416                         return (-1);
 417                 break;
 418 #endif /* INET6 */
 419         default:
 420                 panic("%s: unknown address family %u", __func__, af);
 421         }
 422         return (0);
 423 }
 424
 425 static __inline uint32_t
 426 pf_hashkey(struct pf_state_key *sk)
 427 {
 428         uint32_t h;
 429
 430         h = murmur3_32_hash32((uint32_t *)sk,
 431             sizeof(struct pf_state_key_cmp)/sizeof(uint32_t),
 432             V_pf_hashseed);
 433
 434         return (h & pf_hashmask);
 435 }
 436
 437 static __inline uint32_t
 438 pf_hashsrc(struct pf_addr *addr, sa_family_t af)
 439 {
 440         uint32_t h;
 441
 442         switch (af) {
 443         case AF_INET:
 444                 h = murmur3_32_hash32((uint32_t *)&addr->v4,
 445                     sizeof(addr->v4)/sizeof(uint32_t), V_pf_hashseed);
 446                 break;
 447         case AF_INET6:
 448                 h = murmur3_32_hash32((uint32_t *)&addr->v6,
 449                     sizeof(addr->v6)/sizeof(uint32_t), V_pf_hashseed);
 450                 break;
 451         default:
 452                 panic("%s: unknown address family %u", __func__, af);
 453         }
 454
 455         return (h & pf_srchashmask);
 456 }
 457
 458 #ifdef ALTQ
 459 static int
 460 pf_state_hash(struct pf_state *s)
 461 {
 462         u_int32_t hv = (intptr_t)s / sizeof(*s);
 463
 464         hv ^= crc32(&s->src, sizeof(s->src));
 465         hv ^= crc32(&s->dst, sizeof(s->dst));
 466         if (hv == 0)
 467                 hv = 1;
 468         return (hv);
 469 }
 470 #endif
 471
 472 #ifdef INET6
 473 void
 474 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
 475 {
 476         switch (af) {
 477 #ifdef INET
 478         case AF_INET:
 479                 dst->addr32[0] = src->addr32[0];
 480                 break;
 481 #endif /* INET */
 482         case AF_INET6:
 483                 dst->addr32[0] = src->addr32[0];
 484                 dst->addr32[1] = src->addr32[1];
 485                 dst->addr32[2] = src->addr32[2];
 486                 dst->addr32[3] = src->addr32[3];
 487                 break;
 488         }
 489 }
 490 #endif /* INET6 */
 491
 492 static void
 493 pf_init_threshold(struct pf_threshold *threshold,
 494     u_int32_t limit, u_int32_t seconds)
 495 {
 496         threshold->limit = limit * PF_THRESHOLD_MULT;
 497         threshold->seconds = seconds;
 498         threshold->count = 0;
 499         threshold->last = time_uptime;
 500 }
 501
 502 static void
 503 pf_add_threshold(struct pf_threshold *threshold)
 504 {
 505         u_int32_t t = time_uptime, diff = t - threshold->last;
 506
 507         if (diff >= threshold->seconds)
 508                 threshold->count = 0;
 509         else
 510                 threshold->count -= threshold->count * diff /
 511                     threshold->seconds;
 512         threshold->count += PF_THRESHOLD_MULT;
 513         threshold->last = t;
 514 }
 515
 516 static int
 517 pf_check_threshold(struct pf_threshold *threshold)
 518 {
 519         return (threshold->count > threshold->limit);
 520 }
 521
 522 static int
 523 pf_src_connlimit(struct pf_state **state)
 524 {
 525         struct pf_overload_entry *pfoe;
 526         int bad = 0;
 527
 528         PF_STATE_LOCK_ASSERT(*state);
 529
 530         (*state)->src_node->conn++;
 531         (*state)->src.tcp_est = 1;
 532         pf_add_threshold(&(*state)->src_node->conn_rate);
 533
 534         if ((*state)->rule.ptr->max_src_conn &&
 535             (*state)->rule.ptr->max_src_conn <
 536             (*state)->src_node->conn) {
 537                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONN], 1);
 538                 bad++;
 539         }
 540
 541         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
 542             pf_check_threshold(&(*state)->src_node->conn_rate)) {
 543                 counter_u64_add(V_pf_status.lcounters[LCNT_SRCCONNRATE], 1);
 544                 bad++;
 545         }
 546
 547         if (!bad)
 548                 return (0);
 549
 550         /* Kill this state. */
 551         (*state)->timeout = PFTM_PURGE;
 552         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 553
 554         if ((*state)->rule.ptr->overload_tbl == NULL)
 555                 return (1);
 556
 557         /* Schedule overloading and flushing task. */
 558         pfoe = malloc(sizeof(*pfoe), M_PFTEMP, M_NOWAIT);
 559         if (pfoe == NULL)
 560                 return (1);     /* too bad :( */
 561
 562         bcopy(&(*state)->src_node->addr, &pfoe->addr, sizeof(pfoe->addr));
 563         pfoe->af = (*state)->key[PF_SK_WIRE]->af;
 564         pfoe->rule = (*state)->rule.ptr;
 565         pfoe->dir = (*state)->direction;
 566         PF_OVERLOADQ_LOCK();
 567         SLIST_INSERT_HEAD(&V_pf_overloadqueue, pfoe, next);
 568         PF_OVERLOADQ_UNLOCK();
 569         taskqueue_enqueue(taskqueue_swi, &V_pf_overloadtask);
 570
 571         return (1);
 572 }
 573
 574 static void
 575 pf_overload_task(void *v, int pending)
 576 {
 577         struct pf_overload_head queue;
 578         struct pfr_addr p;
 579         struct pf_overload_entry *pfoe, *pfoe1;
 580         uint32_t killed = 0;
 581
 582         CURVNET_SET((struct vnet *)v);
 583
 584         PF_OVERLOADQ_LOCK();
 585         queue = V_pf_overloadqueue;
 586         SLIST_INIT(&V_pf_overloadqueue);
 587         PF_OVERLOADQ_UNLOCK();
 588
 589         bzero(&p, sizeof(p));
 590         SLIST_FOREACH(pfoe, &queue, next) {
 591                 counter_u64_add(V_pf_status.lcounters[LCNT_OVERLOAD_TABLE], 1);
 592                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 593                         printf("%s: blocking address ", __func__);
 594                         pf_print_host(&pfoe->addr, 0, pfoe->af);
 595                         printf("\n");
 596                 }
 597
 598                 p.pfra_af = pfoe->af;
 599                 switch (pfoe->af) {
 600 #ifdef INET
 601                 case AF_INET:
 602                         p.pfra_net = 32;
 603                         p.pfra_ip4addr = pfoe->addr.v4;
 604                         break;
 605 #endif
 606 #ifdef INET6
 607                 case AF_INET6:
 608                         p.pfra_net = 128;
 609                         p.pfra_ip6addr = pfoe->addr.v6;
 610                         break;
 611 #endif
 612                 }
 613
 614                 PF_RULES_WLOCK();
 615                 pfr_insert_kentry(pfoe->rule->overload_tbl, &p, time_second);
 616                 PF_RULES_WUNLOCK();
 617         }
 618
 619         /*
 620          * Remove those entries, that don't need flushing.
 621          */
 622         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 623                 if (pfoe->rule->flush == 0) {
 624                         SLIST_REMOVE(&queue, pfoe, pf_overload_entry, next);
 625                         free(pfoe, M_PFTEMP);
 626                 } else
 627                         counter_u64_add(
 628                             V_pf_status.lcounters[LCNT_OVERLOAD_FLUSH], 1);
 629
 630         /* If nothing to flush, return. */
 631         if (SLIST_EMPTY(&queue)) {
 632                 CURVNET_RESTORE();
 633                 return;
 634         }
 635
 636         for (int i = 0; i <= pf_hashmask; i++) {
 637                 struct pf_idhash *ih = &V_pf_idhash[i];
 638                 struct pf_state_key *sk;
 639                 struct pf_state *s;
 640
 641                 PF_HASHROW_LOCK(ih);
 642                 LIST_FOREACH(s, &ih->states, entry) {
 643                     sk = s->key[PF_SK_WIRE];
 644                     SLIST_FOREACH(pfoe, &queue, next)
 645                         if (sk->af == pfoe->af &&
 646                             ((pfoe->rule->flush & PF_FLUSH_GLOBAL) ||
 647                             pfoe->rule == s->rule.ptr) &&
 648                             ((pfoe->dir == PF_OUT &&
 649                             PF_AEQ(&pfoe->addr, &sk->addr[1], sk->af)) ||
 650                             (pfoe->dir == PF_IN &&
 651                             PF_AEQ(&pfoe->addr, &sk->addr[0], sk->af)))) {
 652                                 s->timeout = PFTM_PURGE;
 653                                 s->src.state = s->dst.state = TCPS_CLOSED;
 654                                 killed++;
 655                         }
 656                 }
 657                 PF_HASHROW_UNLOCK(ih);
 658         }
 659         SLIST_FOREACH_SAFE(pfoe, &queue, next, pfoe1)
 660                 free(pfoe, M_PFTEMP);
 661         if (V_pf_status.debug >= PF_DEBUG_MISC)
 662                 printf("%s: %u states killed", __func__, killed);
 663
 664         CURVNET_RESTORE();
 665 }
 666
 667 /*
 668  * Can return locked on failure, so that we can consistently
 669  * allocate and insert a new one.
 670  */
 671 struct pf_src_node *
 672 pf_find_src_node(struct pf_addr *src, struct pf_rule *rule, sa_family_t af,
 673         int returnlocked)
 674 {
 675         struct pf_srchash *sh;
 676         struct pf_src_node *n;
 677
 678         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_SEARCH], 1);
 679
 680         sh = &V_pf_srchash[pf_hashsrc(src, af)];
 681         PF_HASHROW_LOCK(sh);
 682         LIST_FOREACH(n, &sh->nodes, entry)
 683                 if (n->rule.ptr == rule && n->af == af &&
 684                     ((af == AF_INET && n->addr.v4.s_addr == src->v4.s_addr) ||
 685                     (af == AF_INET6 && bcmp(&n->addr, src, sizeof(*src)) == 0)))
 686                         break;
 687         if (n != NULL) {
 688                 n->states++;
 689                 PF_HASHROW_UNLOCK(sh);
 690         } else if (returnlocked == 0)
 691                 PF_HASHROW_UNLOCK(sh);
 692
 693         return (n);
 694 }
 695
 696 static int
 697 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
 698     struct pf_addr *src, sa_family_t af)
 699 {
 700
 701         KASSERT((rule->rule_flag & PFRULE_RULESRCTRACK ||
 702             rule->rpool.opts & PF_POOL_STICKYADDR),
 703             ("%s for non-tracking rule %p", __func__, rule));
 704
 705         if (*sn == NULL)
 706                 *sn = pf_find_src_node(src, rule, af, 1);
 707
 708         if (*sn == NULL) {
 709                 struct pf_srchash *sh = &V_pf_srchash[pf_hashsrc(src, af)];
 710
 711                 PF_HASHROW_ASSERT(sh);
 712
 713                 if (!rule->max_src_nodes ||
 714                     counter_u64_fetch(rule->src_nodes) < rule->max_src_nodes)
 715                         (*sn) = uma_zalloc(V_pf_sources_z, M_NOWAIT | M_ZERO);
 716                 else
 717                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCNODES],
 718                             1);
 719                 if ((*sn) == NULL) {
 720                         PF_HASHROW_UNLOCK(sh);
 721                         return (-1);
 722                 }
 723
 724                 pf_init_threshold(&(*sn)->conn_rate,
 725                     rule->max_src_conn_rate.limit,
 726                     rule->max_src_conn_rate.seconds);
 727
 728                 (*sn)->af = af;
 729                 (*sn)->rule.ptr = rule;
 730                 PF_ACPY(&(*sn)->addr, src, af);
 731                 LIST_INSERT_HEAD(&sh->nodes, *sn, entry);
 732                 (*sn)->creation = time_uptime;
 733                 (*sn)->ruletype = rule->action;
 734                 (*sn)->states = 1;
 735                 if ((*sn)->rule.ptr != NULL)
 736                         counter_u64_add((*sn)->rule.ptr->src_nodes, 1);
 737                 PF_HASHROW_UNLOCK(sh);
 738                 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_INSERT], 1);
 739         } else {
 740                 if (rule->max_src_states &&
 741                     (*sn)->states >= rule->max_src_states) {
 742                         counter_u64_add(V_pf_status.lcounters[LCNT_SRCSTATES],
 743                             1);
 744                         return (-1);
 745                 }
 746         }
 747         return (0);
 748 }
 749
 750 void
 751 pf_unlink_src_node(struct pf_src_node *src)
 752 {
 753
 754         PF_HASHROW_ASSERT(&V_pf_srchash[pf_hashsrc(&src->addr, src->af)]);
 755         LIST_REMOVE(src, entry);
 756         if (src->rule.ptr)
 757                 counter_u64_add(src->rule.ptr->src_nodes, -1);
 758 }
 759
 760 u_int
 761 pf_free_src_nodes(struct pf_src_node_list *head)
 762 {
 763         struct pf_src_node *sn, *tmp;
 764         u_int count = 0;
 765
 766         LIST_FOREACH_SAFE(sn, head, entry, tmp) {
 767                 uma_zfree(V_pf_sources_z, sn);
 768                 count++;
 769         }
 770
 771         counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], count);
 772
 773         return (count);
 774 }
 775
 776 void
 777 pf_mtag_initialize()
 778 {
 779
 780         pf_mtag_z = uma_zcreate("pf mtags", sizeof(struct m_tag) +
 781             sizeof(struct pf_mtag), NULL, NULL, pf_mtag_uminit, NULL,
 782             UMA_ALIGN_PTR, 0);
 783 }
 784
 785 /* Per-vnet data storage structures initialization. */
 786 void
 787 pf_initialize()
 788 {
 789         struct pf_keyhash       *kh;
 790         struct pf_idhash        *ih;
 791         struct pf_srchash       *sh;
 792         u_int i;
 793
 794         if (pf_hashsize == 0 || !powerof2(pf_hashsize))
 795                 pf_hashsize = PF_HASHSIZ;
 796         if (pf_srchashsize == 0 || !powerof2(pf_srchashsize))
 797                 pf_srchashsize = PF_SRCHASHSIZ;
 798
 799         V_pf_hashseed = arc4random();
 800
 801         /* States and state keys storage. */
 802         V_pf_state_z = uma_zcreate("pf states", sizeof(struct pf_state),
 803             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 804         V_pf_limits[PF_LIMIT_STATES].zone = V_pf_state_z;
 805         uma_zone_set_max(V_pf_state_z, PFSTATE_HIWAT);
 806         uma_zone_set_warning(V_pf_state_z, "PF states limit reached");
 807
 808         V_pf_state_key_z = uma_zcreate("pf state keys",
 809             sizeof(struct pf_state_key), pf_state_key_ctor, NULL, NULL, NULL,
 810             UMA_ALIGN_PTR, 0);
 811
 812         V_pf_keyhash = mallocarray(pf_hashsize, sizeof(struct pf_keyhash),
 813             M_PFHASH, M_NOWAIT | M_ZERO);
 814         V_pf_idhash = mallocarray(pf_hashsize, sizeof(struct pf_idhash),
 815             M_PFHASH, M_NOWAIT | M_ZERO);
 816         if (V_pf_keyhash == NULL || V_pf_idhash == NULL) {
 817                 printf("pf: Unable to allocate memory for "
 818                     "state_hashsize %lu.\n", pf_hashsize);
 819
 820                 free(V_pf_keyhash, M_PFHASH);
 821                 free(V_pf_idhash, M_PFHASH);
 822
 823                 pf_hashsize = PF_HASHSIZ;
 824                 V_pf_keyhash = mallocarray(pf_hashsize,
 825                     sizeof(struct pf_keyhash), M_PFHASH, M_WAITOK | M_ZERO);
 826                 V_pf_idhash = mallocarray(pf_hashsize,
 827                     sizeof(struct pf_idhash), M_PFHASH, M_WAITOK | M_ZERO);
 828         }
 829
 830         pf_hashmask = pf_hashsize - 1;
 831         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 832             i++, kh++, ih++) {
 833                 mtx_init(&kh->lock, "pf_keyhash", NULL, MTX_DEF | MTX_DUPOK);
 834                 mtx_init(&ih->lock, "pf_idhash", NULL, MTX_DEF);
 835         }
 836
 837         /* Source nodes. */
 838         V_pf_sources_z = uma_zcreate("pf source nodes",
 839             sizeof(struct pf_src_node), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
 840             0);
 841         V_pf_limits[PF_LIMIT_SRC_NODES].zone = V_pf_sources_z;
 842         uma_zone_set_max(V_pf_sources_z, PFSNODE_HIWAT);
 843         uma_zone_set_warning(V_pf_sources_z, "PF source nodes limit reached");
 844
 845         V_pf_srchash = mallocarray(pf_srchashsize,
 846             sizeof(struct pf_srchash), M_PFHASH, M_NOWAIT | M_ZERO);
 847         if (V_pf_srchash == NULL) {
 848                 printf("pf: Unable to allocate memory for "
 849                     "source_hashsize %lu.\n", pf_srchashsize);
 850
 851                 pf_srchashsize = PF_SRCHASHSIZ;
 852                 V_pf_srchash = mallocarray(pf_srchashsize,
 853                     sizeof(struct pf_srchash), M_PFHASH, M_WAITOK | M_ZERO);
 854         }
 855
 856         pf_srchashmask = pf_srchashsize - 1;
 857         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++)
 858                 mtx_init(&sh->lock, "pf_srchash", NULL, MTX_DEF);
 859
 860         /* ALTQ */
 861         TAILQ_INIT(&V_pf_altqs[0]);
 862         TAILQ_INIT(&V_pf_altqs[1]);
 863         TAILQ_INIT(&V_pf_pabuf);
 864         V_pf_altqs_active = &V_pf_altqs[0];
 865         V_pf_altqs_inactive = &V_pf_altqs[1];
 866
 867         /* Send & overload+flush queues. */
 868         STAILQ_INIT(&V_pf_sendqueue);
 869         SLIST_INIT(&V_pf_overloadqueue);
 870         TASK_INIT(&V_pf_overloadtask, 0, pf_overload_task, curvnet);
 871
 872         /* Unlinked, but may be referenced rules. */
 873         TAILQ_INIT(&V_pf_unlinked_rules);
 874 }
 875
 876 void
 877 pf_mtag_cleanup()
 878 {
 879
 880         uma_zdestroy(pf_mtag_z);
 881 }
 882
 883 void
 884 pf_cleanup()
 885 {
 886         struct pf_keyhash       *kh;
 887         struct pf_idhash        *ih;
 888         struct pf_srchash       *sh;
 889         struct pf_send_entry    *pfse, *next;
 890         u_int i;
 891
 892         for (i = 0, kh = V_pf_keyhash, ih = V_pf_idhash; i <= pf_hashmask;
 893             i++, kh++, ih++) {
 894                 KASSERT(LIST_EMPTY(&kh->keys), ("%s: key hash not empty",
 895                     __func__));
 896                 KASSERT(LIST_EMPTY(&ih->states), ("%s: id hash not empty",
 897                     __func__));
 898                 mtx_destroy(&kh->lock);
 899                 mtx_destroy(&ih->lock);
 900         }
 901         free(V_pf_keyhash, M_PFHASH);
 902         free(V_pf_idhash, M_PFHASH);
 903
 904         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
 905                 KASSERT(LIST_EMPTY(&sh->nodes),
 906                     ("%s: source node hash not empty", __func__));
 907                 mtx_destroy(&sh->lock);
 908         }
 909         free(V_pf_srchash, M_PFHASH);
 910
 911         STAILQ_FOREACH_SAFE(pfse, &V_pf_sendqueue, pfse_next, next) {
 912                 m_freem(pfse->pfse_m);
 913                 free(pfse, M_PFTEMP);
 914         }
 915
 916         uma_zdestroy(V_pf_sources_z);
 917         uma_zdestroy(V_pf_state_z);
 918         uma_zdestroy(V_pf_state_key_z);
 919 }
 920
 921 static int
 922 pf_mtag_uminit(void *mem, int size, int how)
 923 {
 924         struct m_tag *t;
 925
 926         t = (struct m_tag *)mem;
 927         t->m_tag_cookie = MTAG_ABI_COMPAT;
 928         t->m_tag_id = PACKET_TAG_PF;
 929         t->m_tag_len = sizeof(struct pf_mtag);
 930         t->m_tag_free = pf_mtag_free;
 931
 932         return (0);
 933 }
 934
 935 static void
 936 pf_mtag_free(struct m_tag *t)
 937 {
 938
 939         uma_zfree(pf_mtag_z, t);
 940 }
 941
 942 struct pf_mtag *
 943 pf_get_mtag(struct mbuf *m)
 944 {
 945         struct m_tag *mtag;
 946
 947         if ((mtag = m_tag_find(m, PACKET_TAG_PF, NULL)) != NULL)
 948                 return ((struct pf_mtag *)(mtag + 1));
 949
 950         mtag = uma_zalloc(pf_mtag_z, M_NOWAIT);
 951         if (mtag == NULL)
 952                 return (NULL);
 953         bzero(mtag + 1, sizeof(struct pf_mtag));
 954         m_tag_prepend(m, mtag);
 955
 956         return ((struct pf_mtag *)(mtag + 1));
 957 }
 958
 959 static int
 960 pf_state_key_attach(struct pf_state_key *skw, struct pf_state_key *sks,
 961     struct pf_state *s)
 962 {
 963         struct pf_keyhash       *khs, *khw, *kh;
 964         struct pf_state_key     *sk, *cur;
 965         struct pf_state         *si, *olds = NULL;
 966         int idx;
 967
 968         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
 969         KASSERT(s->key[PF_SK_WIRE] == NULL, ("%s: state has key", __func__));
 970         KASSERT(s->key[PF_SK_STACK] == NULL, ("%s: state has key", __func__));
 971
 972         /*
 973          * We need to lock hash slots of both keys. To avoid deadlock
 974          * we always lock the slot with lower address first. Unlock order
 975          * isn't important.
 976          *
 977          * We also need to lock ID hash slot before dropping key
 978          * locks. On success we return with ID hash slot locked.
 979          */
 980
 981         if (skw == sks) {
 982                 khs = khw = &V_pf_keyhash[pf_hashkey(skw)];
 983                 PF_HASHROW_LOCK(khs);
 984         } else {
 985                 khs = &V_pf_keyhash[pf_hashkey(sks)];
 986                 khw = &V_pf_keyhash[pf_hashkey(skw)];
 987                 if (khs == khw) {
 988                         PF_HASHROW_LOCK(khs);
 989                 } else if (khs < khw) {
 990                         PF_HASHROW_LOCK(khs);
 991                         PF_HASHROW_LOCK(khw);
 992                 } else {
 993                         PF_HASHROW_LOCK(khw);
 994                         PF_HASHROW_LOCK(khs);
 995                 }
 996         }
 997
 998 #define KEYS_UNLOCK()   do {                    \
 999         if (khs != khw) {                       \
1000                 PF_HASHROW_UNLOCK(khs);         \
1001                 PF_HASHROW_UNLOCK(khw);         \
1002         } else                                  \
1003                 PF_HASHROW_UNLOCK(khs);         \
1004 } while (0)
1005
1006         /*
1007          * First run: start with wire key.
1008          */
1009         sk = skw;
1010         kh = khw;
1011         idx = PF_SK_WIRE;
1012
1013 keyattach:
1014         LIST_FOREACH(cur, &kh->keys, entry)
1015                 if (bcmp(cur, sk, sizeof(struct pf_state_key_cmp)) == 0)
1016                         break;
1017
1018         if (cur != NULL) {
1019                 /* Key exists. Check for same kif, if none, add to key. */
1020                 TAILQ_FOREACH(si, &cur->states[idx], key_list[idx]) {
1021                         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(si)];
1022
1023                         PF_HASHROW_LOCK(ih);
1024                         if (si->kif == s->kif &&
1025                             si->direction == s->direction) {
1026                                 if (sk->proto == IPPROTO_TCP &&
1027                                     si->src.state >= TCPS_FIN_WAIT_2 &&
1028                                     si->dst.state >= TCPS_FIN_WAIT_2) {
1029                                         /*
1030                                          * New state matches an old >FIN_WAIT_2
1031                                          * state. We can't drop key hash locks,
1032                                          * thus we can't unlink it properly.
1033                                          *
1034                                          * As a workaround we drop it into
1035                                          * TCPS_CLOSED state, schedule purge
1036                                          * ASAP and push it into the very end
1037                                          * of the slot TAILQ, so that it won't
1038                                          * conflict with our new state.
1039                                          */
1040                                         si->src.state = si->dst.state =
1041                                             TCPS_CLOSED;
1042                                         si->timeout = PFTM_PURGE;
1043                                         olds = si;
1044                                 } else {
1045                                         if (V_pf_status.debug >= PF_DEBUG_MISC) {
1046                                                 printf("pf: %s key attach "
1047                                                     "failed on %s: ",
1048                                                     (idx == PF_SK_WIRE) ?
1049                                                     "wire" : "stack",
1050                                                     s->kif->pfik_name);
1051                                                 pf_print_state_parts(s,
1052                                                     (idx == PF_SK_WIRE) ?
1053                                                     sk : NULL,
1054                                                     (idx == PF_SK_STACK) ?
1055                                                     sk : NULL);
1056                                                 printf(", existing: ");
1057                                                 pf_print_state_parts(si,
1058                                                     (idx == PF_SK_WIRE) ?
1059                                                     sk : NULL,
1060                                                     (idx == PF_SK_STACK) ?
1061                                                     sk : NULL);
1062                                                 printf("\n");
1063                                         }
1064                                         PF_HASHROW_UNLOCK(ih);
1065                                         KEYS_UNLOCK();
1066                                         uma_zfree(V_pf_state_key_z, sk);
1067                                         if (idx == PF_SK_STACK)
1068                                                 pf_detach_state(s);
1069                                         return (EEXIST); /* collision! */
1070                                 }
1071                         }
1072                         PF_HASHROW_UNLOCK(ih);
1073                 }
1074                 uma_zfree(V_pf_state_key_z, sk);
1075                 s->key[idx] = cur;
1076         } else {
1077                 LIST_INSERT_HEAD(&kh->keys, sk, entry);
1078                 s->key[idx] = sk;
1079         }
1080
1081 stateattach:
1082         /* List is sorted, if-bound states before floating. */
1083         if (s->kif == V_pfi_all)
1084                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], s, key_list[idx]);
1085         else
1086                 TAILQ_INSERT_HEAD(&s->key[idx]->states[idx], s, key_list[idx]);
1087
1088         if (olds) {
1089                 TAILQ_REMOVE(&s->key[idx]->states[idx], olds, key_list[idx]);
1090                 TAILQ_INSERT_TAIL(&s->key[idx]->states[idx], olds,
1091                     key_list[idx]);
1092                 olds = NULL;
1093         }
1094
1095         /*
1096          * Attach done. See how should we (or should not?)
1097          * attach a second key.
1098          */
1099         if (sks == skw) {
1100                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
1101                 idx = PF_SK_STACK;
1102                 sks = NULL;
1103                 goto stateattach;
1104         } else if (sks != NULL) {
1105                 /*
1106                  * Continue attaching with stack key.
1107                  */
1108                 sk = sks;
1109                 kh = khs;
1110                 idx = PF_SK_STACK;
1111                 sks = NULL;
1112                 goto keyattach;
1113         }
1114
1115         PF_STATE_LOCK(s);
1116         KEYS_UNLOCK();
1117
1118         KASSERT(s->key[PF_SK_WIRE] != NULL && s->key[PF_SK_STACK] != NULL,
1119             ("%s failure", __func__));
1120
1121         return (0);
1122 #undef  KEYS_UNLOCK
1123 }
1124
1125 static void
1126 pf_detach_state(struct pf_state *s)
1127 {
1128         struct pf_state_key *sks = s->key[PF_SK_STACK];
1129         struct pf_keyhash *kh;
1130
1131         if (sks != NULL) {
1132                 kh = &V_pf_keyhash[pf_hashkey(sks)];
1133                 PF_HASHROW_LOCK(kh);
1134                 if (s->key[PF_SK_STACK] != NULL)
1135                         pf_state_key_detach(s, PF_SK_STACK);
1136                 /*
1137                  * If both point to same key, then we are done.
1138                  */
1139                 if (sks == s->key[PF_SK_WIRE]) {
1140                         pf_state_key_detach(s, PF_SK_WIRE);
1141                         PF_HASHROW_UNLOCK(kh);
1142                         return;
1143                 }
1144                 PF_HASHROW_UNLOCK(kh);
1145         }
1146
1147         if (s->key[PF_SK_WIRE] != NULL) {
1148                 kh = &V_pf_keyhash[pf_hashkey(s->key[PF_SK_WIRE])];
1149                 PF_HASHROW_LOCK(kh);
1150                 if (s->key[PF_SK_WIRE] != NULL)
1151                         pf_state_key_detach(s, PF_SK_WIRE);
1152                 PF_HASHROW_UNLOCK(kh);
1153         }
1154 }
1155
1156 static void
1157 pf_state_key_detach(struct pf_state *s, int idx)
1158 {
1159         struct pf_state_key *sk = s->key[idx];
1160 #ifdef INVARIANTS
1161         struct pf_keyhash *kh = &V_pf_keyhash[pf_hashkey(sk)];
1162
1163         PF_HASHROW_ASSERT(kh);
1164 #endif
1165         TAILQ_REMOVE(&sk->states[idx], s, key_list[idx]);
1166         s->key[idx] = NULL;
1167
1168         if (TAILQ_EMPTY(&sk->states[0]) && TAILQ_EMPTY(&sk->states[1])) {
1169                 LIST_REMOVE(sk, entry);
1170                 uma_zfree(V_pf_state_key_z, sk);
1171         }
1172 }
1173
1174 static int
1175 pf_state_key_ctor(void *mem, int size, void *arg, int flags)
1176 {
1177         struct pf_state_key *sk = mem;
1178
1179         bzero(sk, sizeof(struct pf_state_key_cmp));
1180         TAILQ_INIT(&sk->states[PF_SK_WIRE]);
1181         TAILQ_INIT(&sk->states[PF_SK_STACK]);
1182
1183         return (0);
1184 }
1185
1186 struct pf_state_key *
1187 pf_state_key_setup(struct pf_pdesc *pd, struct pf_addr *saddr,
1188         struct pf_addr *daddr, u_int16_t sport, u_int16_t dport)
1189 {
1190         struct pf_state_key *sk;
1191
1192         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1193         if (sk == NULL)
1194                 return (NULL);
1195
1196         PF_ACPY(&sk->addr[pd->sidx], saddr, pd->af);
1197         PF_ACPY(&sk->addr[pd->didx], daddr, pd->af);
1198         sk->port[pd->sidx] = sport;
1199         sk->port[pd->didx] = dport;
1200         sk->proto = pd->proto;
1201         sk->af = pd->af;
1202
1203         return (sk);
1204 }
1205
1206 struct pf_state_key *
1207 pf_state_key_clone(struct pf_state_key *orig)
1208 {
1209         struct pf_state_key *sk;
1210
1211         sk = uma_zalloc(V_pf_state_key_z, M_NOWAIT);
1212         if (sk == NULL)
1213                 return (NULL);
1214
1215         bcopy(orig, sk, sizeof(struct pf_state_key_cmp));
1216
1217         return (sk);
1218 }
1219
1220 int
1221 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
1222     struct pf_state_key *sks, struct pf_state *s)
1223 {
1224         struct pf_idhash *ih;
1225         struct pf_state *cur;
1226         int error;
1227
1228         KASSERT(TAILQ_EMPTY(&sks->states[0]) && TAILQ_EMPTY(&sks->states[1]),
1229             ("%s: sks not pristine", __func__));
1230         KASSERT(TAILQ_EMPTY(&skw->states[0]) && TAILQ_EMPTY(&skw->states[1]),
1231             ("%s: skw not pristine", __func__));
1232         KASSERT(s->refs == 0, ("%s: state not pristine", __func__));
1233
1234         s->kif = kif;
1235
1236         if (s->id == 0 && s->creatorid == 0) {
1237                 /* XXX: should be atomic, but probability of collision low */
1238                 if ((s->id = V_pf_stateid[curcpu]++) == PFID_MAXID)
1239                         V_pf_stateid[curcpu] = 1;
1240                 s->id |= (uint64_t )curcpu << PFID_CPUSHIFT;
1241                 s->id = htobe64(s->id);
1242                 s->creatorid = V_pf_status.hostid;
1243         }
1244
1245         /* Returns with ID locked on success. */
1246         if ((error = pf_state_key_attach(skw, sks, s)) != 0)
1247                 return (error);
1248
1249         ih = &V_pf_idhash[PF_IDHASH(s)];
1250         PF_HASHROW_ASSERT(ih);
1251         LIST_FOREACH(cur, &ih->states, entry)
1252                 if (cur->id == s->id && cur->creatorid == s->creatorid)
1253                         break;
1254
1255         if (cur != NULL) {
1256                 PF_HASHROW_UNLOCK(ih);
1257                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1258                         printf("pf: state ID collision: "
1259                             "id: %016llx creatorid: %08x\n",
1260                             (unsigned long long)be64toh(s->id),
1261                             ntohl(s->creatorid));
1262                 }
1263                 pf_detach_state(s);
1264                 return (EEXIST);
1265         }
1266         LIST_INSERT_HEAD(&ih->states, s, entry);
1267         /* One for keys, one for ID hash. */
1268         refcount_init(&s->refs, 2);
1269
1270         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_INSERT], 1);
1271         if (V_pfsync_insert_state_ptr != NULL)
1272                 V_pfsync_insert_state_ptr(s);
1273
1274         /* Returns locked. */
1275         return (0);
1276 }
1277
1278 /*
1279  * Find state by ID: returns with locked row on success.
1280  */
1281 struct pf_state *
1282 pf_find_state_byid(uint64_t id, uint32_t creatorid)
1283 {
1284         struct pf_idhash *ih;
1285         struct pf_state *s;
1286
1287         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1288
1289         ih = &V_pf_idhash[(be64toh(id) % (pf_hashmask + 1))];
1290
1291         PF_HASHROW_LOCK(ih);
1292         LIST_FOREACH(s, &ih->states, entry)
1293                 if (s->id == id && s->creatorid == creatorid)
1294                         break;
1295
1296         if (s == NULL)
1297                 PF_HASHROW_UNLOCK(ih);
1298
1299         return (s);
1300 }
1301
1302 /*
1303  * Find state by key.
1304  * Returns with ID hash slot locked on success.
1305  */
1306 static struct pf_state *
1307 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
1308 {
1309         struct pf_keyhash       *kh;
1310         struct pf_state_key     *sk;
1311         struct pf_state         *s;
1312         int idx;
1313
1314         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1315
1316         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1317
1318         PF_HASHROW_LOCK(kh);
1319         LIST_FOREACH(sk, &kh->keys, entry)
1320                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1321                         break;
1322         if (sk == NULL) {
1323                 PF_HASHROW_UNLOCK(kh);
1324                 return (NULL);
1325         }
1326
1327         idx = (dir == PF_IN ? PF_SK_WIRE : PF_SK_STACK);
1328
1329         /* List is sorted, if-bound states before floating ones. */
1330         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx])
1331                 if (s->kif == V_pfi_all || s->kif == kif) {
1332                         PF_STATE_LOCK(s);
1333                         PF_HASHROW_UNLOCK(kh);
1334                         if (s->timeout >= PFTM_MAX) {
1335                                 /*
1336                                  * State is either being processed by
1337                                  * pf_unlink_state() in an other thread, or
1338                                  * is scheduled for immediate expiry.
1339                                  */
1340                                 PF_STATE_UNLOCK(s);
1341                                 return (NULL);
1342                         }
1343                         return (s);
1344                 }
1345         PF_HASHROW_UNLOCK(kh);
1346
1347         return (NULL);
1348 }
1349
1350 struct pf_state *
1351 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
1352 {
1353         struct pf_keyhash       *kh;
1354         struct pf_state_key     *sk;
1355         struct pf_state         *s, *ret = NULL;
1356         int                      idx, inout = 0;
1357
1358         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_SEARCH], 1);
1359
1360         kh = &V_pf_keyhash[pf_hashkey((struct pf_state_key *)key)];
1361
1362         PF_HASHROW_LOCK(kh);
1363         LIST_FOREACH(sk, &kh->keys, entry)
1364                 if (bcmp(sk, key, sizeof(struct pf_state_key_cmp)) == 0)
1365                         break;
1366         if (sk == NULL) {
1367                 PF_HASHROW_UNLOCK(kh);
1368                 return (NULL);
1369         }
1370         switch (dir) {
1371         case PF_IN:
1372                 idx = PF_SK_WIRE;
1373                 break;
1374         case PF_OUT:
1375                 idx = PF_SK_STACK;
1376                 break;
1377         case PF_INOUT:
1378                 idx = PF_SK_WIRE;
1379                 inout = 1;
1380                 break;
1381         default:
1382                 panic("%s: dir %u", __func__, dir);
1383         }
1384 second_run:
1385         TAILQ_FOREACH(s, &sk->states[idx], key_list[idx]) {
1386                 if (more == NULL) {
1387                         PF_HASHROW_UNLOCK(kh);
1388                         return (s);
1389                 }
1390
1391                 if (ret)
1392                         (*more)++;
1393                 else
1394                         ret = s;
1395         }
1396         if (inout == 1) {
1397                 inout = 0;
1398                 idx = PF_SK_STACK;
1399                 goto second_run;
1400         }
1401         PF_HASHROW_UNLOCK(kh);
1402
1403         return (ret);
1404 }
1405
1406 /* END state table stuff */
1407
1408 static void
1409 pf_send(struct pf_send_entry *pfse)
1410 {
1411
1412         PF_SENDQ_LOCK();
1413         STAILQ_INSERT_TAIL(&V_pf_sendqueue, pfse, pfse_next);
1414         PF_SENDQ_UNLOCK();
1415         swi_sched(V_pf_swi_cookie, 0);
1416 }
1417
1418 void
1419 pf_intr(void *v)
1420 {
1421         struct pf_send_head queue;
1422         struct pf_send_entry *pfse, *next;
1423
1424         CURVNET_SET((struct vnet *)v);
1425
1426         PF_SENDQ_LOCK();
1427         queue = V_pf_sendqueue;
1428         STAILQ_INIT(&V_pf_sendqueue);
1429         PF_SENDQ_UNLOCK();
1430
1431         STAILQ_FOREACH_SAFE(pfse, &queue, pfse_next, next) {
1432                 switch (pfse->pfse_type) {
1433 #ifdef INET
1434                 case PFSE_IP:
1435                         ip_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL);
1436                         break;
1437                 case PFSE_ICMP:
1438                         icmp_error(pfse->pfse_m, pfse->icmpopts.type,
1439                             pfse->icmpopts.code, 0, pfse->icmpopts.mtu);
1440                         break;
1441 #endif /* INET */
1442 #ifdef INET6
1443                 case PFSE_IP6:
1444                         ip6_output(pfse->pfse_m, NULL, NULL, 0, NULL, NULL,
1445                             NULL);
1446                         break;
1447                 case PFSE_ICMP6:
1448                         icmp6_error(pfse->pfse_m, pfse->icmpopts.type,
1449                             pfse->icmpopts.code, pfse->icmpopts.mtu);
1450                         break;
1451 #endif /* INET6 */
1452                 default:
1453                         panic("%s: unknown type", __func__);
1454                 }
1455                 free(pfse, M_PFTEMP);
1456         }
1457         CURVNET_RESTORE();
1458 }
1459
1460 void
1461 pf_purge_thread(void *unused __unused)
1462 {
1463         VNET_ITERATOR_DECL(vnet_iter);
1464
1465         sx_xlock(&pf_end_lock);
1466         while (pf_end_threads == 0) {
1467                 sx_sleep(pf_purge_thread, &pf_end_lock, 0, "pftm", hz / 10);
1468
1469                 VNET_LIST_RLOCK();
1470                 VNET_FOREACH(vnet_iter) {
1471                         CURVNET_SET(vnet_iter);
1472
1473
1474                         /* Wait until V_pf_default_rule is initialized. */
1475                         if (V_pf_vnet_active == 0) {
1476                                 CURVNET_RESTORE();
1477                                 continue;
1478                         }
1479
1480                         /*
1481                          *  Process 1/interval fraction of the state
1482                          * table every run.
1483                          */
1484                         V_pf_purge_idx =
1485                             pf_purge_expired_states(V_pf_purge_idx, pf_hashmask /
1486                             (V_pf_default_rule.timeout[PFTM_INTERVAL] * 10));
1487
1488                         /*
1489                          * Purge other expired types every
1490                          * PFTM_INTERVAL seconds.
1491                          */
1492                         if (V_pf_purge_idx == 0) {
1493                                 /*
1494                                  * Order is important:
1495                                  * - states and src nodes reference rules
1496                                  * - states and rules reference kifs
1497                                  */
1498                                 pf_purge_expired_fragments();
1499                                 pf_purge_expired_src_nodes();
1500                                 pf_purge_unlinked_rules();
1501                                 pfi_kif_purge();
1502                         }
1503                         CURVNET_RESTORE();
1504                 }
1505                 VNET_LIST_RUNLOCK();
1506         }
1507
1508         pf_end_threads++;
1509         sx_xunlock(&pf_end_lock);
1510         kproc_exit(0);
1511 }
1512
1513 void
1514 pf_unload_vnet_purge(void)
1515 {
1516
1517         /*
1518          * To cleanse up all kifs and rules we need
1519          * two runs: first one clears reference flags,
1520          * then pf_purge_expired_states() doesn't
1521          * raise them, and then second run frees.
1522          */
1523         pf_purge_unlinked_rules();
1524         pfi_kif_purge();
1525
1526         /*
1527          * Now purge everything.
1528          */
1529         pf_purge_expired_states(0, pf_hashmask);
1530         pf_purge_fragments(UINT_MAX);
1531         pf_purge_expired_src_nodes();
1532
1533         /*
1534          * Now all kifs & rules should be unreferenced,
1535          * thus should be successfully freed.
1536          */
1537         pf_purge_unlinked_rules();
1538         pfi_kif_purge();
1539 }
1540
1541
1542 u_int32_t
1543 pf_state_expires(const struct pf_state *state)
1544 {
1545         u_int32_t       timeout;
1546         u_int32_t       start;
1547         u_int32_t       end;
1548         u_int32_t       states;
1549
1550         /* handle all PFTM_* > PFTM_MAX here */
1551         if (state->timeout == PFTM_PURGE)
1552                 return (time_uptime);
1553         KASSERT(state->timeout != PFTM_UNLINKED,
1554             ("pf_state_expires: timeout == PFTM_UNLINKED"));
1555         KASSERT((state->timeout < PFTM_MAX),
1556             ("pf_state_expires: timeout > PFTM_MAX"));
1557         timeout = state->rule.ptr->timeout[state->timeout];
1558         if (!timeout)
1559                 timeout = V_pf_default_rule.timeout[state->timeout];
1560         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
1561         if (start) {
1562                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
1563                 states = counter_u64_fetch(state->rule.ptr->states_cur);
1564         } else {
1565                 start = V_pf_default_rule.timeout[PFTM_ADAPTIVE_START];
1566                 end = V_pf_default_rule.timeout[PFTM_ADAPTIVE_END];
1567                 states = V_pf_status.states;
1568         }
1569         if (end && states > start && start < end) {
1570                 if (states < end) {
1571                         timeout = (u_int64_t)timeout * (end - states) /
1572                             (end - start);
1573                         return (state->expire + timeout);
1574                 }
1575                 else
1576                         return (time_uptime);
1577         }
1578         return (state->expire + timeout);
1579 }
1580
1581 void
1582 pf_purge_expired_src_nodes()
1583 {
1584         struct pf_src_node_list  freelist;
1585         struct pf_srchash       *sh;
1586         struct pf_src_node      *cur, *next;
1587         int i;
1588
1589         LIST_INIT(&freelist);
1590         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1591             PF_HASHROW_LOCK(sh);
1592             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1593                 if (cur->states == 0 && cur->expire <= time_uptime) {
1594                         pf_unlink_src_node(cur);
1595                         LIST_INSERT_HEAD(&freelist, cur, entry);
1596                 } else if (cur->rule.ptr != NULL)
1597                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1598             PF_HASHROW_UNLOCK(sh);
1599         }
1600
1601         pf_free_src_nodes(&freelist);
1602
1603         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1604 }
1605
1606 static void
1607 pf_src_tree_remove_state(struct pf_state *s)
1608 {
1609         struct pf_src_node *sn;
1610         struct pf_srchash *sh;
1611         uint32_t timeout;
1612
1613         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
1614             s->rule.ptr->timeout[PFTM_SRC_NODE] :
1615             V_pf_default_rule.timeout[PFTM_SRC_NODE];
1616
1617         if (s->src_node != NULL) {
1618                 sn = s->src_node;
1619                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1620                 PF_HASHROW_LOCK(sh);
1621                 if (s->src.tcp_est)
1622                         --sn->conn;
1623                 if (--sn->states == 0)
1624                         sn->expire = time_uptime + timeout;
1625                 PF_HASHROW_UNLOCK(sh);
1626         }
1627         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1628                 sn = s->nat_src_node;
1629                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1630                 PF_HASHROW_LOCK(sh);
1631                 if (--sn->states == 0)
1632                         sn->expire = time_uptime + timeout;
1633                 PF_HASHROW_UNLOCK(sh);
1634         }
1635         s->src_node = s->nat_src_node = NULL;
1636 }
1637
1638 /*
1639  * Unlink and potentilly free a state. Function may be
1640  * called with ID hash row locked, but always returns
1641  * unlocked, since it needs to go through key hash locking.
1642  */
1643 int
1644 pf_unlink_state(struct pf_state *s, u_int flags)
1645 {
1646         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1647
1648         if ((flags & PF_ENTER_LOCKED) == 0)
1649                 PF_HASHROW_LOCK(ih);
1650         else
1651                 PF_HASHROW_ASSERT(ih);
1652
1653         if (s->timeout == PFTM_UNLINKED) {
1654                 /*
1655                  * State is being processed
1656                  * by pf_unlink_state() in
1657                  * an other thread.
1658                  */
1659                 PF_HASHROW_UNLOCK(ih);
1660                 return (0);     /* XXXGL: undefined actually */
1661         }
1662
1663         if (s->src.state == PF_TCPS_PROXY_DST) {
1664                 /* XXX wire key the right one? */
1665                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1666                     &s->key[PF_SK_WIRE]->addr[1],
1667                     &s->key[PF_SK_WIRE]->addr[0],
1668                     s->key[PF_SK_WIRE]->port[1],
1669                     s->key[PF_SK_WIRE]->port[0],
1670                     s->src.seqhi, s->src.seqlo + 1,
1671                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1672         }
1673
1674         LIST_REMOVE(s, entry);
1675         pf_src_tree_remove_state(s);
1676
1677         if (V_pfsync_delete_state_ptr != NULL)
1678                 V_pfsync_delete_state_ptr(s);
1679
1680         STATE_DEC_COUNTERS(s);
1681
1682         s->timeout = PFTM_UNLINKED;
1683
1684         PF_HASHROW_UNLOCK(ih);
1685
1686         pf_detach_state(s);
1687         /* pf_state_insert() initialises refs to 2, so we can never release the
1688          * last reference here, only in pf_release_state(). */
1689         (void)refcount_release(&s->refs);
1690
1691         return (pf_release_state(s));
1692 }
1693
1694 void
1695 pf_free_state(struct pf_state *cur)
1696 {
1697
1698         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1699         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1700             cur->timeout));
1701
1702         pf_normalize_tcp_cleanup(cur);
1703         uma_zfree(V_pf_state_z, cur);
1704         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1705 }
1706
1707 /*
1708  * Called only from pf_purge_thread(), thus serialized.
1709  */
1710 static u_int
1711 pf_purge_expired_states(u_int i, int maxcheck)
1712 {
1713         struct pf_idhash *ih;
1714         struct pf_state *s;
1715
1716         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1717
1718         /*
1719          * Go through hash and unlink states that expire now.
1720          */
1721         while (maxcheck > 0) {
1722
1723                 ih = &V_pf_idhash[i];
1724
1725                 /* only take the lock if we expect to do work */
1726                 if (!LIST_EMPTY(&ih->states)) {
1727 relock:
1728                         PF_HASHROW_LOCK(ih);
1729                         LIST_FOREACH(s, &ih->states, entry) {
1730                                 if (pf_state_expires(s) <= time_uptime) {
1731                                         V_pf_status.states -=
1732                                             pf_unlink_state(s, PF_ENTER_LOCKED);
1733                                         goto relock;
1734                                 }
1735                                 s->rule.ptr->rule_flag |= PFRULE_REFS;
1736                                 if (s->nat_rule.ptr != NULL)
1737                                         s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1738                                 if (s->anchor.ptr != NULL)
1739                                         s->anchor.ptr->rule_flag |= PFRULE_REFS;
1740                                 s->kif->pfik_flags |= PFI_IFLAG_REFS;
1741                                 if (s->rt_kif)
1742                                         s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1743                         }
1744                         PF_HASHROW_UNLOCK(ih);
1745                 }
1746
1747                 /* Return when we hit end of hash. */
1748                 if (++i > pf_hashmask) {
1749                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1750                         return (0);
1751                 }
1752
1753                 maxcheck--;
1754         }
1755
1756         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1757
1758         return (i);
1759 }
1760
1761 static void
1762 pf_purge_unlinked_rules()
1763 {
1764         struct pf_rulequeue tmpq;
1765         struct pf_rule *r, *r1;
1766
1767         /*
1768          * If we have overloading task pending, then we'd
1769          * better skip purging this time. There is a tiny
1770          * probability that overloading task references
1771          * an already unlinked rule.
1772          */
1773         PF_OVERLOADQ_LOCK();
1774         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1775                 PF_OVERLOADQ_UNLOCK();
1776                 return;
1777         }
1778         PF_OVERLOADQ_UNLOCK();
1779
1780         /*
1781          * Do naive mark-and-sweep garbage collecting of old rules.
1782          * Reference flag is raised by pf_purge_expired_states()
1783          * and pf_purge_expired_src_nodes().
1784          *
1785          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1786          * use a temporary queue.
1787          */
1788         TAILQ_INIT(&tmpq);
1789         PF_UNLNKDRULES_LOCK();
1790         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1791                 if (!(r->rule_flag & PFRULE_REFS)) {
1792                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1793                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1794                 } else
1795                         r->rule_flag &= ~PFRULE_REFS;
1796         }
1797         PF_UNLNKDRULES_UNLOCK();
1798
1799         if (!TAILQ_EMPTY(&tmpq)) {
1800                 PF_RULES_WLOCK();
1801                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1802                         TAILQ_REMOVE(&tmpq, r, entries);
1803                         pf_free_rule(r);
1804                 }
1805                 PF_RULES_WUNLOCK();
1806         }
1807 }
1808
1809 void
1810 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1811 {
1812         switch (af) {
1813 #ifdef INET
1814         case AF_INET: {
1815                 u_int32_t a = ntohl(addr->addr32[0]);
1816                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1817                     (a>>8)&255, a&255);
1818                 if (p) {
1819                         p = ntohs(p);
1820                         printf(":%u", p);
1821                 }
1822                 break;
1823         }
1824 #endif /* INET */
1825 #ifdef INET6
1826         case AF_INET6: {
1827                 u_int16_t b;
1828                 u_int8_t i, curstart, curend, maxstart, maxend;
1829                 curstart = curend = maxstart = maxend = 255;
1830                 for (i = 0; i < 8; i++) {
1831                         if (!addr->addr16[i]) {
1832                                 if (curstart == 255)
1833                                         curstart = i;
1834                                 curend = i;
1835                         } else {
1836                                 if ((curend - curstart) >
1837                                     (maxend - maxstart)) {
1838                                         maxstart = curstart;
1839                                         maxend = curend;
1840                                 }
1841                                 curstart = curend = 255;
1842                         }
1843                 }
1844                 if ((curend - curstart) >
1845                     (maxend - maxstart)) {
1846                         maxstart = curstart;
1847                         maxend = curend;
1848                 }
1849                 for (i = 0; i < 8; i++) {
1850                         if (i >= maxstart && i <= maxend) {
1851                                 if (i == 0)
1852                                         printf(":");
1853                                 if (i == maxend)
1854                                         printf(":");
1855                         } else {
1856                                 b = ntohs(addr->addr16[i]);
1857                                 printf("%x", b);
1858                                 if (i < 7)
1859                                         printf(":");
1860                         }
1861                 }
1862                 if (p) {
1863                         p = ntohs(p);
1864                         printf("[%u]", p);
1865                 }
1866                 break;
1867         }
1868 #endif /* INET6 */
1869         }
1870 }
1871
1872 void
1873 pf_print_state(struct pf_state *s)
1874 {
1875         pf_print_state_parts(s, NULL, NULL);
1876 }
1877
1878 static void
1879 pf_print_state_parts(struct pf_state *s,
1880     struct pf_state_key *skwp, struct pf_state_key *sksp)
1881 {
1882         struct pf_state_key *skw, *sks;
1883         u_int8_t proto, dir;
1884
1885         /* Do our best to fill these, but they're skipped if NULL */
1886         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1887         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1888         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1889         dir = s ? s->direction : 0;
1890
1891         switch (proto) {
1892         case IPPROTO_IPV4:
1893                 printf("IPv4");
1894                 break;
1895         case IPPROTO_IPV6:
1896                 printf("IPv6");
1897                 break;
1898         case IPPROTO_TCP:
1899                 printf("TCP");
1900                 break;
1901         case IPPROTO_UDP:
1902                 printf("UDP");
1903                 break;
1904         case IPPROTO_ICMP:
1905                 printf("ICMP");
1906                 break;
1907         case IPPROTO_ICMPV6:
1908                 printf("ICMPv6");
1909                 break;
1910         default:
1911                 printf("%u", proto);
1912                 break;
1913         }
1914         switch (dir) {
1915         case PF_IN:
1916                 printf(" in");
1917                 break;
1918         case PF_OUT:
1919                 printf(" out");
1920                 break;
1921         }
1922         if (skw) {
1923                 printf(" wire: ");
1924                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1925                 printf(" ");
1926                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1927         }
1928         if (sks) {
1929                 printf(" stack: ");
1930                 if (sks != skw) {
1931                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1932                         printf(" ");
1933                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1934                 } else
1935                         printf("-");
1936         }
1937         if (s) {
1938                 if (proto == IPPROTO_TCP) {
1939                         printf(" [lo=%u high=%u win=%u modulator=%u",
1940                             s->src.seqlo, s->src.seqhi,
1941                             s->src.max_win, s->src.seqdiff);
1942                         if (s->src.wscale && s->dst.wscale)
1943                                 printf(" wscale=%u",
1944                                     s->src.wscale & PF_WSCALE_MASK);
1945                         printf("]");
1946                         printf(" [lo=%u high=%u win=%u modulator=%u",
1947                             s->dst.seqlo, s->dst.seqhi,
1948                             s->dst.max_win, s->dst.seqdiff);
1949                         if (s->src.wscale && s->dst.wscale)
1950                                 printf(" wscale=%u",
1951                                 s->dst.wscale & PF_WSCALE_MASK);
1952                         printf("]");
1953                 }
1954                 printf(" %u:%u", s->src.state, s->dst.state);
1955         }
1956 }
1957
1958 void
1959 pf_print_flags(u_int8_t f)
1960 {
1961         if (f)
1962                 printf(" ");
1963         if (f & TH_FIN)
1964                 printf("F");
1965         if (f & TH_SYN)
1966                 printf("S");
1967         if (f & TH_RST)
1968                 printf("R");
1969         if (f & TH_PUSH)
1970                 printf("P");
1971         if (f & TH_ACK)
1972                 printf("A");
1973         if (f & TH_URG)
1974                 printf("U");
1975         if (f & TH_ECE)
1976                 printf("E");
1977         if (f & TH_CWR)
1978                 printf("W");
1979 }
1980
1981 #define PF_SET_SKIP_STEPS(i)                                    \
1982         do {                                                    \
1983                 while (head[i] != cur) {                        \
1984                         head[i]->skip[i].ptr = cur;             \
1985                         head[i] = TAILQ_NEXT(head[i], entries); \
1986                 }                                               \
1987         } while (0)
1988
1989 void
1990 pf_calc_skip_steps(struct pf_rulequeue *rules)
1991 {
1992         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1993         int i;
1994
1995         cur = TAILQ_FIRST(rules);
1996         prev = cur;
1997         for (i = 0; i < PF_SKIP_COUNT; ++i)
1998                 head[i] = cur;
1999         while (cur != NULL) {
2000
2001                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
2002                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
2003                 if (cur->direction != prev->direction)
2004                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
2005                 if (cur->af != prev->af)
2006                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
2007                 if (cur->proto != prev->proto)
2008                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
2009                 if (cur->src.neg != prev->src.neg ||
2010                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
2011                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
2012                 if (cur->src.port[0] != prev->src.port[0] ||
2013                     cur->src.port[1] != prev->src.port[1] ||
2014                     cur->src.port_op != prev->src.port_op)
2015                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
2016                 if (cur->dst.neg != prev->dst.neg ||
2017                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
2018                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
2019                 if (cur->dst.port[0] != prev->dst.port[0] ||
2020                     cur->dst.port[1] != prev->dst.port[1] ||
2021                     cur->dst.port_op != prev->dst.port_op)
2022                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
2023
2024                 prev = cur;
2025                 cur = TAILQ_NEXT(cur, entries);
2026         }
2027         for (i = 0; i < PF_SKIP_COUNT; ++i)
2028                 PF_SET_SKIP_STEPS(i);
2029 }
2030
2031 static int
2032 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
2033 {
2034         if (aw1->type != aw2->type)
2035                 return (1);
2036         switch (aw1->type) {
2037         case PF_ADDR_ADDRMASK:
2038         case PF_ADDR_RANGE:
2039                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2040                         return (1);
2041                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2042                         return (1);
2043                 return (0);
2044         case PF_ADDR_DYNIFTL:
2045                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2046         case PF_ADDR_NOROUTE:
2047         case PF_ADDR_URPFFAILED:
2048                 return (0);
2049         case PF_ADDR_TABLE:
2050                 return (aw1->p.tbl != aw2->p.tbl);
2051         default:
2052                 printf("invalid address type: %d\n", aw1->type);
2053                 return (1);
2054         }
2055 }
2056
2057 /**
2058  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2059  * header isn't always a full checksum. In some cases (i.e. output) it's a
2060  * pseudo-header checksum, which is a partial checksum over src/dst IP
2061  * addresses, protocol number and length.
2062  *
2063  * That means we have the following cases:
2064  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2065  *      checksums, we need to update the checksum whenever we change anything.
2066  *  * Output (i.e. the checksum is a pseudo-header checksum):
2067  *      x The field being updated is src/dst address or affects the length of
2068  *      the packet. We need to update the pseudo-header checksum (note that this
2069  *      checksum is not ones' complement).
2070  *      x Some other field is being modified (e.g. src/dst port numbers): We
2071  *      don't have to update anything.
2072  **/
2073 u_int16_t
2074 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2075 {
2076         u_int32_t       l;
2077
2078         if (udp && !cksum)
2079                 return (0x0000);
2080         l = cksum + old - new;
2081         l = (l >> 16) + (l & 65535);
2082         l = l & 65535;
2083         if (udp && !l)
2084                 return (0xFFFF);
2085         return (l);
2086 }
2087
2088 u_int16_t
2089 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2090         u_int16_t new, u_int8_t udp)
2091 {
2092         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2093                 return (cksum);
2094
2095         return (pf_cksum_fixup(cksum, old, new, udp));
2096 }
2097
2098 static void
2099 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2100         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2101         sa_family_t af)
2102 {
2103         struct pf_addr  ao;
2104         u_int16_t       po = *p;
2105
2106         PF_ACPY(&ao, a, af);
2107         PF_ACPY(a, an, af);
2108
2109         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2110                 *pc = ~*pc;
2111
2112         *p = pn;
2113
2114         switch (af) {
2115 #ifdef INET
2116         case AF_INET:
2117                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2118                     ao.addr16[0], an->addr16[0], 0),
2119                     ao.addr16[1], an->addr16[1], 0);
2120                 *p = pn;
2121
2122                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2123                     ao.addr16[0], an->addr16[0], u),
2124                     ao.addr16[1], an->addr16[1], u);
2125
2126                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2127                 break;
2128 #endif /* INET */
2129 #ifdef INET6
2130         case AF_INET6:
2131                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2132                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2133                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2134                     ao.addr16[0], an->addr16[0], u),
2135                     ao.addr16[1], an->addr16[1], u),
2136                     ao.addr16[2], an->addr16[2], u),
2137                     ao.addr16[3], an->addr16[3], u),
2138                     ao.addr16[4], an->addr16[4], u),
2139                     ao.addr16[5], an->addr16[5], u),
2140                     ao.addr16[6], an->addr16[6], u),
2141                     ao.addr16[7], an->addr16[7], u);
2142
2143                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2144                 break;
2145 #endif /* INET6 */
2146         }
2147
2148         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2149             CSUM_DELAY_DATA_IPV6)) {
2150                 *pc = ~*pc;
2151                 if (! *pc)
2152                         *pc = 0xffff;
2153         }
2154 }
2155
2156 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2157 void
2158 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2159 {
2160         u_int32_t       ao;
2161
2162         memcpy(&ao, a, sizeof(ao));
2163         memcpy(a, &an, sizeof(u_int32_t));
2164         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2165             ao % 65536, an % 65536, u);
2166 }
2167
2168 void
2169 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2170 {
2171         u_int32_t       ao;
2172
2173         memcpy(&ao, a, sizeof(ao));
2174         memcpy(a, &an, sizeof(u_int32_t));
2175
2176         *c = pf_proto_cksum_fixup(m,
2177             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2178             ao % 65536, an % 65536, udp);
2179 }
2180
2181 #ifdef INET6
2182 static void
2183 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2184 {
2185         struct pf_addr  ao;
2186
2187         PF_ACPY(&ao, a, AF_INET6);
2188         PF_ACPY(a, an, AF_INET6);
2189
2190         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2191             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2192             pf_cksum_fixup(pf_cksum_fixup(*c,
2193             ao.addr16[0], an->addr16[0], u),
2194             ao.addr16[1], an->addr16[1], u),
2195             ao.addr16[2], an->addr16[2], u),
2196             ao.addr16[3], an->addr16[3], u),
2197             ao.addr16[4], an->addr16[4], u),
2198             ao.addr16[5], an->addr16[5], u),
2199             ao.addr16[6], an->addr16[6], u),
2200             ao.addr16[7], an->addr16[7], u);
2201 }
2202 #endif /* INET6 */
2203
2204 static void
2205 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2206     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2207     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2208 {
2209         struct pf_addr  oia, ooa;
2210
2211         PF_ACPY(&oia, ia, af);
2212         if (oa)
2213                 PF_ACPY(&ooa, oa, af);
2214
2215         /* Change inner protocol port, fix inner protocol checksum. */
2216         if (ip != NULL) {
2217                 u_int16_t       oip = *ip;
2218                 u_int32_t       opc;
2219
2220                 if (pc != NULL)
2221                         opc = *pc;
2222                 *ip = np;
2223                 if (pc != NULL)
2224                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2225                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2226                 if (pc != NULL)
2227                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2228         }
2229         /* Change inner ip address, fix inner ip and icmp checksums. */
2230         PF_ACPY(ia, na, af);
2231         switch (af) {
2232 #ifdef INET
2233         case AF_INET: {
2234                 u_int32_t        oh2c = *h2c;
2235
2236                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2237                     oia.addr16[0], ia->addr16[0], 0),
2238                     oia.addr16[1], ia->addr16[1], 0);
2239                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2240                     oia.addr16[0], ia->addr16[0], 0),
2241                     oia.addr16[1], ia->addr16[1], 0);
2242                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2243                 break;
2244         }
2245 #endif /* INET */
2246 #ifdef INET6
2247         case AF_INET6:
2248                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2249                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2250                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2251                     oia.addr16[0], ia->addr16[0], u),
2252                     oia.addr16[1], ia->addr16[1], u),
2253                     oia.addr16[2], ia->addr16[2], u),
2254                     oia.addr16[3], ia->addr16[3], u),
2255                     oia.addr16[4], ia->addr16[4], u),
2256                     oia.addr16[5], ia->addr16[5], u),
2257                     oia.addr16[6], ia->addr16[6], u),
2258                     oia.addr16[7], ia->addr16[7], u);
2259                 break;
2260 #endif /* INET6 */
2261         }
2262         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2263         if (oa) {
2264                 PF_ACPY(oa, na, af);
2265                 switch (af) {
2266 #ifdef INET
2267                 case AF_INET:
2268                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2269                             ooa.addr16[0], oa->addr16[0], 0),
2270                             ooa.addr16[1], oa->addr16[1], 0);
2271                         break;
2272 #endif /* INET */
2273 #ifdef INET6
2274                 case AF_INET6:
2275                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2276                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2277                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2278                             ooa.addr16[0], oa->addr16[0], u),
2279                             ooa.addr16[1], oa->addr16[1], u),
2280                             ooa.addr16[2], oa->addr16[2], u),
2281                             ooa.addr16[3], oa->addr16[3], u),
2282                             ooa.addr16[4], oa->addr16[4], u),
2283                             ooa.addr16[5], oa->addr16[5], u),
2284                             ooa.addr16[6], oa->addr16[6], u),
2285                             ooa.addr16[7], oa->addr16[7], u);
2286                         break;
2287 #endif /* INET6 */
2288                 }
2289         }
2290 }
2291
2292
2293 /*
2294  * Need to modulate the sequence numbers in the TCP SACK option
2295  * (credits to Krzysztof Pfaff for report and patch)
2296  */
2297 static int
2298 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2299     struct tcphdr *th, struct pf_state_peer *dst)
2300 {
2301         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2302         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2303         int copyback = 0, i, olen;
2304         struct sackblk sack;
2305
2306 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2307         if (hlen < TCPOLEN_SACKLEN ||
2308             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2309                 return 0;
2310
2311         while (hlen >= TCPOLEN_SACKLEN) {
2312                 olen = opt[1];
2313                 switch (*opt) {
2314                 case TCPOPT_EOL:        /* FALLTHROUGH */
2315                 case TCPOPT_NOP:
2316                         opt++;
2317                         hlen--;
2318                         break;
2319                 case TCPOPT_SACK:
2320                         if (olen > hlen)
2321                                 olen = hlen;
2322                         if (olen >= TCPOLEN_SACKLEN) {
2323                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2324                                     i += TCPOLEN_SACK) {
2325                                         memcpy(&sack, &opt[i], sizeof(sack));
2326                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2327                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2328                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2329                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2330                                         memcpy(&opt[i], &sack, sizeof(sack));
2331                                 }
2332                                 copyback = 1;
2333                         }
2334                         /* FALLTHROUGH */
2335                 default:
2336                         if (olen < 2)
2337                                 olen = 2;
2338                         hlen -= olen;
2339                         opt += olen;
2340                 }
2341         }
2342
2343         if (copyback)
2344                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2345         return (copyback);
2346 }
2347
2348 static void
2349 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2350     const struct pf_addr *saddr, const struct pf_addr *daddr,
2351     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2352     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2353     u_int16_t rtag, struct ifnet *ifp)
2354 {
2355         struct pf_send_entry *pfse;
2356         struct mbuf     *m;
2357         int              len, tlen;
2358 #ifdef INET
2359         struct ip       *h = NULL;
2360 #endif /* INET */
2361 #ifdef INET6
2362         struct ip6_hdr  *h6 = NULL;
2363 #endif /* INET6 */
2364         struct tcphdr   *th;
2365         char            *opt;
2366         struct pf_mtag  *pf_mtag;
2367
2368         len = 0;
2369         th = NULL;
2370
2371         /* maximum segment size tcp option */
2372         tlen = sizeof(struct tcphdr);
2373         if (mss)
2374                 tlen += 4;
2375
2376         switch (af) {
2377 #ifdef INET
2378         case AF_INET:
2379                 len = sizeof(struct ip) + tlen;
2380                 break;
2381 #endif /* INET */
2382 #ifdef INET6
2383         case AF_INET6:
2384                 len = sizeof(struct ip6_hdr) + tlen;
2385                 break;
2386 #endif /* INET6 */
2387         default:
2388                 panic("%s: unsupported af %d", __func__, af);
2389         }
2390
2391         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2392         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2393         if (pfse == NULL)
2394                 return;
2395         m = m_gethdr(M_NOWAIT, MT_DATA);
2396         if (m == NULL) {
2397                 free(pfse, M_PFTEMP);
2398                 return;
2399         }
2400 #ifdef MAC
2401         mac_netinet_firewall_send(m);
2402 #endif
2403         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2404                 free(pfse, M_PFTEMP);
2405                 m_freem(m);
2406                 return;
2407         }
2408         if (tag)
2409                 m->m_flags |= M_SKIP_FIREWALL;
2410         pf_mtag->tag = rtag;
2411
2412         if (r != NULL && r->rtableid >= 0)
2413                 M_SETFIB(m, r->rtableid);
2414
2415 #ifdef ALTQ
2416         if (r != NULL && r->qid) {
2417                 pf_mtag->qid = r->qid;
2418
2419                 /* add hints for ecn */
2420                 pf_mtag->hdr = mtod(m, struct ip *);
2421         }
2422 #endif /* ALTQ */
2423         m->m_data += max_linkhdr;
2424         m->m_pkthdr.len = m->m_len = len;
2425         m->m_pkthdr.rcvif = NULL;
2426         bzero(m->m_data, len);
2427         switch (af) {
2428 #ifdef INET
2429         case AF_INET:
2430                 h = mtod(m, struct ip *);
2431
2432                 /* IP header fields included in the TCP checksum */
2433                 h->ip_p = IPPROTO_TCP;
2434                 h->ip_len = htons(tlen);
2435                 h->ip_src.s_addr = saddr->v4.s_addr;
2436                 h->ip_dst.s_addr = daddr->v4.s_addr;
2437
2438                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2439                 break;
2440 #endif /* INET */
2441 #ifdef INET6
2442         case AF_INET6:
2443                 h6 = mtod(m, struct ip6_hdr *);
2444
2445                 /* IP header fields included in the TCP checksum */
2446                 h6->ip6_nxt = IPPROTO_TCP;
2447                 h6->ip6_plen = htons(tlen);
2448                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2449                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2450
2451                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2452                 break;
2453 #endif /* INET6 */
2454         }
2455
2456         /* TCP header */
2457         th->th_sport = sport;
2458         th->th_dport = dport;
2459         th->th_seq = htonl(seq);
2460         th->th_ack = htonl(ack);
2461         th->th_off = tlen >> 2;
2462         th->th_flags = flags;
2463         th->th_win = htons(win);
2464
2465         if (mss) {
2466                 opt = (char *)(th + 1);
2467                 opt[0] = TCPOPT_MAXSEG;
2468                 opt[1] = 4;
2469                 HTONS(mss);
2470                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2471         }
2472
2473         switch (af) {
2474 #ifdef INET
2475         case AF_INET:
2476                 /* TCP checksum */
2477                 th->th_sum = in_cksum(m, len);
2478
2479                 /* Finish the IP header */
2480                 h->ip_v = 4;
2481                 h->ip_hl = sizeof(*h) >> 2;
2482                 h->ip_tos = IPTOS_LOWDELAY;
2483                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2484                 h->ip_len = htons(len);
2485                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2486                 h->ip_sum = 0;
2487
2488                 pfse->pfse_type = PFSE_IP;
2489                 break;
2490 #endif /* INET */
2491 #ifdef INET6
2492         case AF_INET6:
2493                 /* TCP checksum */
2494                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2495                     sizeof(struct ip6_hdr), tlen);
2496
2497                 h6->ip6_vfc |= IPV6_VERSION;
2498                 h6->ip6_hlim = IPV6_DEFHLIM;
2499
2500                 pfse->pfse_type = PFSE_IP6;
2501                 break;
2502 #endif /* INET6 */
2503         }
2504         pfse->pfse_m = m;
2505         pf_send(pfse);
2506 }
2507
2508 static void
2509 pf_return(struct pf_rule *r, struct pf_rule *nr, struct pf_pdesc *pd,
2510     struct pf_state_key *sk, int off, struct mbuf *m, struct tcphdr *th,
2511     struct pfi_kif *kif, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen,
2512     u_short *reason)
2513 {
2514         struct pf_addr  * const saddr = pd->src;
2515         struct pf_addr  * const daddr = pd->dst;
2516         sa_family_t      af = pd->af;
2517
2518         /* undo NAT changes, if they have taken place */
2519         if (nr != NULL) {
2520                 PF_ACPY(saddr, &sk->addr[pd->sidx], af);
2521                 PF_ACPY(daddr, &sk->addr[pd->didx], af);
2522                 if (pd->sport)
2523                         *pd->sport = sk->port[pd->sidx];
2524                 if (pd->dport)
2525                         *pd->dport = sk->port[pd->didx];
2526                 if (pd->proto_sum)
2527                         *pd->proto_sum = bproto_sum;
2528                 if (pd->ip_sum)
2529                         *pd->ip_sum = bip_sum;
2530                 m_copyback(m, off, hdrlen, pd->hdr.any);
2531         }
2532         if (pd->proto == IPPROTO_TCP &&
2533             ((r->rule_flag & PFRULE_RETURNRST) ||
2534             (r->rule_flag & PFRULE_RETURN)) &&
2535             !(th->th_flags & TH_RST)) {
2536                 u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
2537                 int              len = 0;
2538 #ifdef INET
2539                 struct ip       *h4;
2540 #endif
2541 #ifdef INET6
2542                 struct ip6_hdr  *h6;
2543 #endif
2544
2545                 switch (af) {
2546 #ifdef INET
2547                 case AF_INET:
2548                         h4 = mtod(m, struct ip *);
2549                         len = ntohs(h4->ip_len) - off;
2550                         break;
2551 #endif
2552 #ifdef INET6
2553                 case AF_INET6:
2554                         h6 = mtod(m, struct ip6_hdr *);
2555                         len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
2556                         break;
2557 #endif
2558                 }
2559
2560                 if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
2561                         REASON_SET(reason, PFRES_PROTCKSUM);
2562                 else {
2563                         if (th->th_flags & TH_SYN)
2564                                 ack++;
2565                         if (th->th_flags & TH_FIN)
2566                                 ack++;
2567                         pf_send_tcp(m, r, af, pd->dst,
2568                                 pd->src, th->th_dport, th->th_sport,
2569                                 ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
2570                                 r->return_ttl, 1, 0, kif->pfik_ifp);
2571                 }
2572         } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
2573                 r->return_icmp)
2574                 pf_send_icmp(m, r->return_icmp >> 8,
2575                         r->return_icmp & 255, af, r);
2576         else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
2577                 r->return_icmp6)
2578                 pf_send_icmp(m, r->return_icmp6 >> 8,
2579                         r->return_icmp6 & 255, af, r);
2580 }
2581
2582
2583 static int
2584 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio)
2585 {
2586         struct m_tag *mtag;
2587
2588         KASSERT(prio <= PF_PRIO_MAX,
2589             ("%s with invalid pcp", __func__));
2590
2591         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
2592         if (mtag == NULL) {
2593                 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
2594                     sizeof(uint8_t), M_NOWAIT);
2595                 if (mtag == NULL)
2596                         return (ENOMEM);
2597                 m_tag_prepend(m, mtag);
2598         }
2599
2600         *(uint8_t *)(mtag + 1) = prio;
2601         return (0);
2602 }
2603
2604 static int
2605 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
2606 {
2607         struct m_tag *mtag;
2608         u_int8_t mpcp;
2609
2610         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
2611         if (mtag == NULL)
2612                 return (0);
2613
2614         if (prio == PF_PRIO_ZERO)
2615                 prio = 0;
2616
2617         mpcp = *(uint8_t *)(mtag + 1);
2618
2619         return (mpcp == prio);
2620 }
2621
2622 static void
2623 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2624     struct pf_rule *r)
2625 {
2626         struct pf_send_entry *pfse;
2627         struct mbuf *m0;
2628         struct pf_mtag *pf_mtag;
2629
2630         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2631         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2632         if (pfse == NULL)
2633                 return;
2634
2635         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2636                 free(pfse, M_PFTEMP);
2637                 return;
2638         }
2639
2640         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2641                 free(pfse, M_PFTEMP);
2642                 return;
2643         }
2644         /* XXX: revisit */
2645         m0->m_flags |= M_SKIP_FIREWALL;
2646
2647         if (r->rtableid >= 0)
2648                 M_SETFIB(m0, r->rtableid);
2649
2650 #ifdef ALTQ
2651         if (r->qid) {
2652                 pf_mtag->qid = r->qid;
2653                 /* add hints for ecn */
2654                 pf_mtag->hdr = mtod(m0, struct ip *);
2655         }
2656 #endif /* ALTQ */
2657
2658         switch (af) {
2659 #ifdef INET
2660         case AF_INET:
2661                 pfse->pfse_type = PFSE_ICMP;
2662                 break;
2663 #endif /* INET */
2664 #ifdef INET6
2665         case AF_INET6:
2666                 pfse->pfse_type = PFSE_ICMP6;
2667                 break;
2668 #endif /* INET6 */
2669         }
2670         pfse->pfse_m = m0;
2671         pfse->icmpopts.type = type;
2672         pfse->icmpopts.code = code;
2673         pf_send(pfse);
2674 }
2675
2676 /*
2677  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2678  * If n is 0, they match if they are equal. If n is != 0, they match if they
2679  * are different.
2680  */
2681 int
2682 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2683     struct pf_addr *b, sa_family_t af)
2684 {
2685         int     match = 0;
2686
2687         switch (af) {
2688 #ifdef INET
2689         case AF_INET:
2690                 if ((a->addr32[0] & m->addr32[0]) ==
2691                     (b->addr32[0] & m->addr32[0]))
2692                         match++;
2693                 break;
2694 #endif /* INET */
2695 #ifdef INET6
2696         case AF_INET6:
2697                 if (((a->addr32[0] & m->addr32[0]) ==
2698                      (b->addr32[0] & m->addr32[0])) &&
2699                     ((a->addr32[1] & m->addr32[1]) ==
2700                      (b->addr32[1] & m->addr32[1])) &&
2701                     ((a->addr32[2] & m->addr32[2]) ==
2702                      (b->addr32[2] & m->addr32[2])) &&
2703                     ((a->addr32[3] & m->addr32[3]) ==
2704                      (b->addr32[3] & m->addr32[3])))
2705                         match++;
2706                 break;
2707 #endif /* INET6 */
2708         }
2709         if (match) {
2710                 if (n)
2711                         return (0);
2712                 else
2713                         return (1);
2714         } else {
2715                 if (n)
2716                         return (1);
2717                 else
2718                         return (0);
2719         }
2720 }
2721
2722 /*
2723  * Return 1 if b <= a <= e, otherwise return 0.
2724  */
2725 int
2726 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2727     struct pf_addr *a, sa_family_t af)
2728 {
2729         switch (af) {
2730 #ifdef INET
2731         case AF_INET:
2732                 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
2733                     (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
2734                         return (0);
2735                 break;
2736 #endif /* INET */
2737 #ifdef INET6
2738         case AF_INET6: {
2739                 int     i;
2740
2741                 /* check a >= b */
2742                 for (i = 0; i < 4; ++i)
2743                         if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
2744                                 break;
2745                         else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
2746                                 return (0);
2747                 /* check a <= e */
2748                 for (i = 0; i < 4; ++i)
2749                         if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
2750                                 break;
2751                         else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
2752                                 return (0);
2753                 break;
2754         }
2755 #endif /* INET6 */
2756         }
2757         return (1);
2758 }
2759
2760 static int
2761 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2762 {
2763         switch (op) {
2764         case PF_OP_IRG:
2765                 return ((p > a1) && (p < a2));
2766         case PF_OP_XRG:
2767                 return ((p < a1) || (p > a2));
2768         case PF_OP_RRG:
2769                 return ((p >= a1) && (p <= a2));
2770         case PF_OP_EQ:
2771                 return (p == a1);
2772         case PF_OP_NE:
2773                 return (p != a1);
2774         case PF_OP_LT:
2775                 return (p < a1);
2776         case PF_OP_LE:
2777                 return (p <= a1);
2778         case PF_OP_GT:
2779                 return (p > a1);
2780         case PF_OP_GE:
2781                 return (p >= a1);
2782         }
2783         return (0); /* never reached */
2784 }
2785
2786 int
2787 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2788 {
2789         NTOHS(a1);
2790         NTOHS(a2);
2791         NTOHS(p);
2792         return (pf_match(op, a1, a2, p));
2793 }
2794
2795 static int
2796 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2797 {
2798         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2799                 return (0);
2800         return (pf_match(op, a1, a2, u));
2801 }
2802
2803 static int
2804 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2805 {
2806         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2807                 return (0);
2808         return (pf_match(op, a1, a2, g));
2809 }
2810
2811 int
2812 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2813 {
2814         if (*tag == -1)
2815                 *tag = mtag;
2816
2817         return ((!r->match_tag_not && r->match_tag == *tag) ||
2818             (r->match_tag_not && r->match_tag != *tag));
2819 }
2820
2821 int
2822 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2823 {
2824
2825         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2826
2827         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2828                 return (ENOMEM);
2829
2830         pd->pf_mtag->tag = tag;
2831
2832         return (0);
2833 }
2834
2835 #define PF_ANCHOR_STACKSIZE     32
2836 struct pf_anchor_stackframe {
2837         struct pf_ruleset       *rs;
2838         struct pf_rule          *r;     /* XXX: + match bit */
2839         struct pf_anchor        *child;
2840 };
2841
2842 /*
2843  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2844  */
2845 #define PF_ANCHORSTACK_MATCH    0x00000001
2846 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2847
2848 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2849 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2850                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2851 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2852                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2853 } while (0)
2854
2855 void
2856 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2857     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2858     int *match)
2859 {
2860         struct pf_anchor_stackframe     *f;
2861
2862         PF_RULES_RASSERT();
2863
2864         if (match)
2865                 *match = 0;
2866         if (*depth >= PF_ANCHOR_STACKSIZE) {
2867                 printf("%s: anchor stack overflow on %s\n",
2868                     __func__, (*r)->anchor->name);
2869                 *r = TAILQ_NEXT(*r, entries);
2870                 return;
2871         } else if (*depth == 0 && a != NULL)
2872                 *a = *r;
2873         f = stack + (*depth)++;
2874         f->rs = *rs;
2875         f->r = *r;
2876         if ((*r)->anchor_wildcard) {
2877                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2878
2879                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2880                         *r = NULL;
2881                         return;
2882                 }
2883                 *rs = &f->child->ruleset;
2884         } else {
2885                 f->child = NULL;
2886                 *rs = &(*r)->anchor->ruleset;
2887         }
2888         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2889 }
2890
2891 int
2892 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2893     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2894     int *match)
2895 {
2896         struct pf_anchor_stackframe     *f;
2897         struct pf_rule *fr;
2898         int quick = 0;
2899
2900         PF_RULES_RASSERT();
2901
2902         do {
2903                 if (*depth <= 0)
2904                         break;
2905                 f = stack + *depth - 1;
2906                 fr = PF_ANCHOR_RULE(f);
2907                 if (f->child != NULL) {
2908                         struct pf_anchor_node *parent;
2909
2910                         /*
2911                          * This block traverses through
2912                          * a wildcard anchor.
2913                          */
2914                         parent = &fr->anchor->children;
2915                         if (match != NULL && *match) {
2916                                 /*
2917                                  * If any of "*" matched, then
2918                                  * "foo/ *" matched, mark frame
2919                                  * appropriately.
2920                                  */
2921                                 PF_ANCHOR_SET_MATCH(f);
2922                                 *match = 0;
2923                         }
2924                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2925                         if (f->child != NULL) {
2926                                 *rs = &f->child->ruleset;
2927                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2928                                 if (*r == NULL)
2929                                         continue;
2930                                 else
2931                                         break;
2932                         }
2933                 }
2934                 (*depth)--;
2935                 if (*depth == 0 && a != NULL)
2936                         *a = NULL;
2937                 *rs = f->rs;
2938                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2939                         quick = fr->quick;
2940                 *r = TAILQ_NEXT(fr, entries);
2941         } while (*r == NULL);
2942
2943         return (quick);
2944 }
2945
2946 #ifdef INET6
2947 void
2948 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2949     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2950 {
2951         switch (af) {
2952 #ifdef INET
2953         case AF_INET:
2954                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2955                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2956                 break;
2957 #endif /* INET */
2958         case AF_INET6:
2959                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2960                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2961                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2962                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2963                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2964                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2965                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2966                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2967                 break;
2968         }
2969 }
2970
2971 void
2972 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2973 {
2974         switch (af) {
2975 #ifdef INET
2976         case AF_INET:
2977                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2978                 break;
2979 #endif /* INET */
2980         case AF_INET6:
2981                 if (addr->addr32[3] == 0xffffffff) {
2982                         addr->addr32[3] = 0;
2983                         if (addr->addr32[2] == 0xffffffff) {
2984                                 addr->addr32[2] = 0;
2985                                 if (addr->addr32[1] == 0xffffffff) {
2986                                         addr->addr32[1] = 0;
2987                                         addr->addr32[0] =
2988                                             htonl(ntohl(addr->addr32[0]) + 1);
2989                                 } else
2990                                         addr->addr32[1] =
2991                                             htonl(ntohl(addr->addr32[1]) + 1);
2992                         } else
2993                                 addr->addr32[2] =
2994                                     htonl(ntohl(addr->addr32[2]) + 1);
2995                 } else
2996                         addr->addr32[3] =
2997                             htonl(ntohl(addr->addr32[3]) + 1);
2998                 break;
2999         }
3000 }
3001 #endif /* INET6 */
3002
3003 int
3004 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
3005 {
3006         struct pf_addr          *saddr, *daddr;
3007         u_int16_t                sport, dport;
3008         struct inpcbinfo        *pi;
3009         struct inpcb            *inp;
3010
3011         pd->lookup.uid = UID_MAX;
3012         pd->lookup.gid = GID_MAX;
3013
3014         switch (pd->proto) {
3015         case IPPROTO_TCP:
3016                 if (pd->hdr.tcp == NULL)
3017                         return (-1);
3018                 sport = pd->hdr.tcp->th_sport;
3019                 dport = pd->hdr.tcp->th_dport;
3020                 pi = &V_tcbinfo;
3021                 break;
3022         case IPPROTO_UDP:
3023                 if (pd->hdr.udp == NULL)
3024                         return (-1);
3025                 sport = pd->hdr.udp->uh_sport;
3026                 dport = pd->hdr.udp->uh_dport;
3027                 pi = &V_udbinfo;
3028                 break;
3029         default:
3030                 return (-1);
3031         }
3032         if (direction == PF_IN) {
3033                 saddr = pd->src;
3034                 daddr = pd->dst;
3035         } else {
3036                 u_int16_t       p;
3037
3038                 p = sport;
3039                 sport = dport;
3040                 dport = p;
3041                 saddr = pd->dst;
3042                 daddr = pd->src;
3043         }
3044         switch (pd->af) {
3045 #ifdef INET
3046         case AF_INET:
3047                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
3048                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3049                 if (inp == NULL) {
3050                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
3051                            daddr->v4, dport, INPLOOKUP_WILDCARD |
3052                            INPLOOKUP_RLOCKPCB, NULL, m);
3053                         if (inp == NULL)
3054                                 return (-1);
3055                 }
3056                 break;
3057 #endif /* INET */
3058 #ifdef INET6
3059         case AF_INET6:
3060                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
3061                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
3062                 if (inp == NULL) {
3063                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
3064                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
3065                             INPLOOKUP_RLOCKPCB, NULL, m);
3066                         if (inp == NULL)
3067                                 return (-1);
3068                 }
3069                 break;
3070 #endif /* INET6 */
3071
3072         default:
3073                 return (-1);
3074         }
3075         INP_RLOCK_ASSERT(inp);
3076         pd->lookup.uid = inp->inp_cred->cr_uid;
3077         pd->lookup.gid = inp->inp_cred->cr_groups[0];
3078         INP_RUNLOCK(inp);
3079
3080         return (1);
3081 }
3082
3083 static u_int8_t
3084 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3085 {
3086         int              hlen;
3087         u_int8_t         hdr[60];
3088         u_int8_t        *opt, optlen;
3089         u_int8_t         wscale = 0;
3090
3091         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3092         if (hlen <= sizeof(struct tcphdr))
3093                 return (0);
3094         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3095                 return (0);
3096         opt = hdr + sizeof(struct tcphdr);
3097         hlen -= sizeof(struct tcphdr);
3098         while (hlen >= 3) {
3099                 switch (*opt) {
3100                 case TCPOPT_EOL:
3101                 case TCPOPT_NOP:
3102                         ++opt;
3103                         --hlen;
3104                         break;
3105                 case TCPOPT_WINDOW:
3106                         wscale = opt[2];
3107                         if (wscale > TCP_MAX_WINSHIFT)
3108                                 wscale = TCP_MAX_WINSHIFT;
3109                         wscale |= PF_WSCALE_FLAG;
3110                         /* FALLTHROUGH */
3111                 default:
3112                         optlen = opt[1];
3113                         if (optlen < 2)
3114                                 optlen = 2;
3115                         hlen -= optlen;
3116                         opt += optlen;
3117                         break;
3118                 }
3119         }
3120         return (wscale);
3121 }
3122
3123 static u_int16_t
3124 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3125 {
3126         int              hlen;
3127         u_int8_t         hdr[60];
3128         u_int8_t        *opt, optlen;
3129         u_int16_t        mss = V_tcp_mssdflt;
3130
3131         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3132         if (hlen <= sizeof(struct tcphdr))
3133                 return (0);
3134         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3135                 return (0);
3136         opt = hdr + sizeof(struct tcphdr);
3137         hlen -= sizeof(struct tcphdr);
3138         while (hlen >= TCPOLEN_MAXSEG) {
3139                 switch (*opt) {
3140                 case TCPOPT_EOL:
3141                 case TCPOPT_NOP:
3142                         ++opt;
3143                         --hlen;
3144                         break;
3145                 case TCPOPT_MAXSEG:
3146                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3147                         NTOHS(mss);
3148                         /* FALLTHROUGH */
3149                 default:
3150                         optlen = opt[1];
3151                         if (optlen < 2)
3152                                 optlen = 2;
3153                         hlen -= optlen;
3154                         opt += optlen;
3155                         break;
3156                 }
3157         }
3158         return (mss);
3159 }
3160
3161 static u_int16_t
3162 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3163 {
3164 #ifdef INET
3165         struct nhop4_basic      nh4;
3166 #endif /* INET */
3167 #ifdef INET6
3168         struct nhop6_basic      nh6;
3169         struct in6_addr         dst6;
3170         uint32_t                scopeid;
3171 #endif /* INET6 */
3172         int                      hlen = 0;
3173         uint16_t                 mss = 0;
3174
3175         switch (af) {
3176 #ifdef INET
3177         case AF_INET:
3178                 hlen = sizeof(struct ip);
3179                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
3180                         mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
3181                 break;
3182 #endif /* INET */
3183 #ifdef INET6
3184         case AF_INET6:
3185                 hlen = sizeof(struct ip6_hdr);
3186                 in6_splitscope(&addr->v6, &dst6, &scopeid);
3187                 if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
3188                         mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
3189                 break;
3190 #endif /* INET6 */
3191         }
3192
3193         mss = max(V_tcp_mssdflt, mss);
3194         mss = min(mss, offer);
3195         mss = max(mss, 64);             /* sanity - at least max opt space */
3196         return (mss);
3197 }
3198
3199 static u_int32_t
3200 pf_tcp_iss(struct pf_pdesc *pd)
3201 {
3202         MD5_CTX ctx;
3203         u_int32_t digest[4];
3204
3205         if (V_pf_tcp_secret_init == 0) {
3206                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3207                 MD5Init(&V_pf_tcp_secret_ctx);
3208                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3209                     sizeof(V_pf_tcp_secret));
3210                 V_pf_tcp_secret_init = 1;
3211         }
3212
3213         ctx = V_pf_tcp_secret_ctx;
3214
3215         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3216         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3217         if (pd->af == AF_INET6) {
3218                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3219                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3220         } else {
3221                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3222                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3223         }
3224         MD5Final((u_char *)digest, &ctx);
3225         V_pf_tcp_iss_off += 4096;
3226 #define ISN_RANDOM_INCREMENT (4096 - 1)
3227         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3228             V_pf_tcp_iss_off);
3229 #undef  ISN_RANDOM_INCREMENT
3230 }
3231
3232 static int
3233 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3234     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3235     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3236 {
3237         struct pf_rule          *nr = NULL;
3238         struct pf_addr          * const saddr = pd->src;
3239         struct pf_addr          * const daddr = pd->dst;
3240         sa_family_t              af = pd->af;
3241         struct pf_rule          *r, *a = NULL;
3242         struct pf_ruleset       *ruleset = NULL;
3243         struct pf_src_node      *nsn = NULL;
3244         struct tcphdr           *th = pd->hdr.tcp;
3245         struct pf_state_key     *sk = NULL, *nk = NULL;
3246         u_short                  reason;
3247         int                      rewrite = 0, hdrlen = 0;
3248         int                      tag = -1, rtableid = -1;
3249         int                      asd = 0;
3250         int                      match = 0;
3251         int                      state_icmp = 0;
3252         u_int16_t                sport = 0, dport = 0;
3253         u_int16_t                bproto_sum = 0, bip_sum = 0;
3254         u_int8_t                 icmptype = 0, icmpcode = 0;
3255         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3256
3257         PF_RULES_RASSERT();
3258
3259         if (inp != NULL) {
3260                 INP_LOCK_ASSERT(inp);
3261                 pd->lookup.uid = inp->inp_cred->cr_uid;
3262                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3263                 pd->lookup.done = 1;
3264         }
3265
3266         switch (pd->proto) {
3267         case IPPROTO_TCP:
3268                 sport = th->th_sport;
3269                 dport = th->th_dport;
3270                 hdrlen = sizeof(*th);
3271                 break;
3272         case IPPROTO_UDP:
3273                 sport = pd->hdr.udp->uh_sport;
3274                 dport = pd->hdr.udp->uh_dport;
3275                 hdrlen = sizeof(*pd->hdr.udp);
3276                 break;
3277 #ifdef INET
3278         case IPPROTO_ICMP:
3279                 if (pd->af != AF_INET)
3280                         break;
3281                 sport = dport = pd->hdr.icmp->icmp_id;
3282                 hdrlen = sizeof(*pd->hdr.icmp);
3283                 icmptype = pd->hdr.icmp->icmp_type;
3284                 icmpcode = pd->hdr.icmp->icmp_code;
3285
3286                 if (icmptype == ICMP_UNREACH ||
3287                     icmptype == ICMP_SOURCEQUENCH ||
3288                     icmptype == ICMP_REDIRECT ||
3289                     icmptype == ICMP_TIMXCEED ||
3290                     icmptype == ICMP_PARAMPROB)
3291                         state_icmp++;
3292                 break;
3293 #endif /* INET */
3294 #ifdef INET6
3295         case IPPROTO_ICMPV6:
3296                 if (af != AF_INET6)
3297                         break;
3298                 sport = dport = pd->hdr.icmp6->icmp6_id;
3299                 hdrlen = sizeof(*pd->hdr.icmp6);
3300                 icmptype = pd->hdr.icmp6->icmp6_type;
3301                 icmpcode = pd->hdr.icmp6->icmp6_code;
3302
3303                 if (icmptype == ICMP6_DST_UNREACH ||
3304                     icmptype == ICMP6_PACKET_TOO_BIG ||
3305                     icmptype == ICMP6_TIME_EXCEEDED ||
3306                     icmptype == ICMP6_PARAM_PROB)
3307                         state_icmp++;
3308                 break;
3309 #endif /* INET6 */
3310         default:
3311                 sport = dport = hdrlen = 0;
3312                 break;
3313         }
3314
3315         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3316
3317         /* check packet for BINAT/NAT/RDR */
3318         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3319             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3320                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3321                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3322
3323                 if (pd->ip_sum)
3324                         bip_sum = *pd->ip_sum;
3325
3326                 switch (pd->proto) {
3327                 case IPPROTO_TCP:
3328                         bproto_sum = th->th_sum;
3329                         pd->proto_sum = &th->th_sum;
3330
3331                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3332                             nk->port[pd->sidx] != sport) {
3333                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3334                                     &th->th_sum, &nk->addr[pd->sidx],
3335                                     nk->port[pd->sidx], 0, af);
3336                                 pd->sport = &th->th_sport;
3337                                 sport = th->th_sport;
3338                         }
3339
3340                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3341                             nk->port[pd->didx] != dport) {
3342                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3343                                     &th->th_sum, &nk->addr[pd->didx],
3344                                     nk->port[pd->didx], 0, af);
3345                                 dport = th->th_dport;
3346                                 pd->dport = &th->th_dport;
3347                         }
3348                         rewrite++;
3349                         break;
3350                 case IPPROTO_UDP:
3351                         bproto_sum = pd->hdr.udp->uh_sum;
3352                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3353
3354                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3355                             nk->port[pd->sidx] != sport) {
3356                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3357                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3358                                     &nk->addr[pd->sidx],
3359                                     nk->port[pd->sidx], 1, af);
3360                                 sport = pd->hdr.udp->uh_sport;
3361                                 pd->sport = &pd->hdr.udp->uh_sport;
3362                         }
3363
3364                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3365                             nk->port[pd->didx] != dport) {
3366                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3367                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3368                                     &nk->addr[pd->didx],
3369                                     nk->port[pd->didx], 1, af);
3370                                 dport = pd->hdr.udp->uh_dport;
3371                                 pd->dport = &pd->hdr.udp->uh_dport;
3372                         }
3373                         rewrite++;
3374                         break;
3375 #ifdef INET
3376                 case IPPROTO_ICMP:
3377                         nk->port[0] = nk->port[1];
3378                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3379                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3380                                     nk->addr[pd->sidx].v4.s_addr, 0);
3381
3382                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3383                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3384                                     nk->addr[pd->didx].v4.s_addr, 0);
3385
3386                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3387                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3388                                     pd->hdr.icmp->icmp_cksum, sport,
3389                                     nk->port[1], 0);
3390                                 pd->hdr.icmp->icmp_id = nk->port[1];
3391                                 pd->sport = &pd->hdr.icmp->icmp_id;
3392                         }
3393                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3394                         break;
3395 #endif /* INET */
3396 #ifdef INET6
3397                 case IPPROTO_ICMPV6:
3398                         nk->port[0] = nk->port[1];
3399                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3400                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3401                                     &nk->addr[pd->sidx], 0);
3402
3403                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3404                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3405                                     &nk->addr[pd->didx], 0);
3406                         rewrite++;
3407                         break;
3408 #endif /* INET */
3409                 default:
3410                         switch (af) {
3411 #ifdef INET
3412                         case AF_INET:
3413                                 if (PF_ANEQ(saddr,
3414                                     &nk->addr[pd->sidx], AF_INET))
3415                                         pf_change_a(&saddr->v4.s_addr,
3416                                             pd->ip_sum,
3417                                             nk->addr[pd->sidx].v4.s_addr, 0);
3418
3419                                 if (PF_ANEQ(daddr,
3420                                     &nk->addr[pd->didx], AF_INET))
3421                                         pf_change_a(&daddr->v4.s_addr,
3422                                             pd->ip_sum,
3423                                             nk->addr[pd->didx].v4.s_addr, 0);
3424                                 break;
3425 #endif /* INET */
3426 #ifdef INET6
3427                         case AF_INET6:
3428                                 if (PF_ANEQ(saddr,
3429                                     &nk->addr[pd->sidx], AF_INET6))
3430                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3431
3432                                 if (PF_ANEQ(daddr,
3433                                     &nk->addr[pd->didx], AF_INET6))
3434                                         PF_ACPY(daddr, &nk->addr[pd->didx], af);
3435                                 break;
3436 #endif /* INET */
3437                         }
3438                         break;
3439                 }
3440                 if (nr->natpass)
3441                         r = NULL;
3442                 pd->nat_rule = nr;
3443         }
3444
3445         while (r != NULL) {
3446                 r->evaluations++;
3447                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3448                         r = r->skip[PF_SKIP_IFP].ptr;
3449                 else if (r->direction && r->direction != direction)
3450                         r = r->skip[PF_SKIP_DIR].ptr;
3451                 else if (r->af && r->af != af)
3452                         r = r->skip[PF_SKIP_AF].ptr;
3453                 else if (r->proto && r->proto != pd->proto)
3454                         r = r->skip[PF_SKIP_PROTO].ptr;
3455                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3456                     r->src.neg, kif, M_GETFIB(m)))
3457                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3458                 /* tcp/udp only. port_op always 0 in other cases */
3459                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3460                     r->src.port[0], r->src.port[1], sport))
3461                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3462                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3463                     r->dst.neg, NULL, M_GETFIB(m)))
3464                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3465                 /* tcp/udp only. port_op always 0 in other cases */
3466                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3467                     r->dst.port[0], r->dst.port[1], dport))
3468                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3469                 /* icmp only. type always 0 in other cases */
3470                 else if (r->type && r->type != icmptype + 1)
3471                         r = TAILQ_NEXT(r, entries);
3472                 /* icmp only. type always 0 in other cases */
3473                 else if (r->code && r->code != icmpcode + 1)
3474                         r = TAILQ_NEXT(r, entries);
3475                 else if (r->tos && !(r->tos == pd->tos))
3476                         r = TAILQ_NEXT(r, entries);
3477                 else if (r->rule_flag & PFRULE_FRAGMENT)
3478                         r = TAILQ_NEXT(r, entries);
3479                 else if (pd->proto == IPPROTO_TCP &&
3480                     (r->flagset & th->th_flags) != r->flags)
3481                         r = TAILQ_NEXT(r, entries);
3482                 /* tcp/udp only. uid.op always 0 in other cases */
3483                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3484                     pf_socket_lookup(direction, pd, m), 1)) &&
3485                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3486                     pd->lookup.uid))
3487                         r = TAILQ_NEXT(r, entries);
3488                 /* tcp/udp only. gid.op always 0 in other cases */
3489                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3490                     pf_socket_lookup(direction, pd, m), 1)) &&
3491                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3492                     pd->lookup.gid))
3493                         r = TAILQ_NEXT(r, entries);
3494                 else if (r->prio &&
3495                     !pf_match_ieee8021q_pcp(r->prio, m))
3496                         r = TAILQ_NEXT(r, entries);
3497                 else if (r->prob &&
3498                     r->prob <= arc4random())
3499                         r = TAILQ_NEXT(r, entries);
3500                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3501                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3502                         r = TAILQ_NEXT(r, entries);
3503                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3504                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3505                     pf_osfp_fingerprint(pd, m, off, th),
3506                     r->os_fingerprint)))
3507                         r = TAILQ_NEXT(r, entries);
3508                 else {
3509                         if (r->tag)
3510                                 tag = r->tag;
3511                         if (r->rtableid >= 0)
3512                                 rtableid = r->rtableid;
3513                         if (r->anchor == NULL) {
3514                                 match = 1;
3515                                 *rm = r;
3516                                 *am = a;
3517                                 *rsm = ruleset;
3518                                 if ((*rm)->quick)
3519                                         break;
3520                                 r = TAILQ_NEXT(r, entries);
3521                         } else
3522                                 pf_step_into_anchor(anchor_stack, &asd,
3523                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3524                                     &match);
3525                 }
3526                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3527                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3528                         break;
3529         }
3530         r = *rm;
3531         a = *am;
3532         ruleset = *rsm;
3533
3534         REASON_SET(&reason, PFRES_MATCH);
3535
3536         if (r->log || (nr != NULL && nr->log)) {
3537                 if (rewrite)
3538                         m_copyback(m, off, hdrlen, pd->hdr.any);
3539                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3540                     ruleset, pd, 1);
3541         }
3542
3543         if ((r->action == PF_DROP) &&
3544             ((r->rule_flag & PFRULE_RETURNRST) ||
3545             (r->rule_flag & PFRULE_RETURNICMP) ||
3546             (r->rule_flag & PFRULE_RETURN))) {
3547                 pf_return(r, nr, pd, sk, off, m, th, kif, bproto_sum,
3548                     bip_sum, hdrlen, &reason);
3549         }
3550
3551         if (r->action == PF_DROP)
3552                 goto cleanup;
3553
3554         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3555                 REASON_SET(&reason, PFRES_MEMORY);
3556                 goto cleanup;
3557         }
3558         if (rtableid >= 0)
3559                 M_SETFIB(m, rtableid);
3560
3561         if (!state_icmp && (r->keep_state || nr != NULL ||
3562             (pd->flags & PFDESC_TCP_NORM))) {
3563                 int action;
3564                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3565                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3566                     hdrlen);
3567                 if (action != PF_PASS) {
3568                         if (action == PF_DROP &&
3569                             (r->rule_flag & PFRULE_RETURN))
3570                                 pf_return(r, nr, pd, sk, off, m, th, kif,
3571                                     bproto_sum, bip_sum, hdrlen, &reason);
3572                         return (action);
3573                 }
3574         } else {
3575                 if (sk != NULL)
3576                         uma_zfree(V_pf_state_key_z, sk);
3577                 if (nk != NULL)
3578                         uma_zfree(V_pf_state_key_z, nk);
3579         }
3580
3581         /* copy back packet headers if we performed NAT operations */
3582         if (rewrite)
3583                 m_copyback(m, off, hdrlen, pd->hdr.any);
3584
3585         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3586             direction == PF_OUT &&
3587             V_pfsync_defer_ptr != NULL && V_pfsync_defer_ptr(*sm, m))
3588                 /*
3589                  * We want the state created, but we dont
3590                  * want to send this in case a partner
3591                  * firewall has to know about it to allow
3592                  * replies through it.
3593                  */
3594                 return (PF_DEFER);
3595
3596         return (PF_PASS);
3597
3598 cleanup:
3599         if (sk != NULL)
3600                 uma_zfree(V_pf_state_key_z, sk);
3601         if (nk != NULL)
3602                 uma_zfree(V_pf_state_key_z, nk);
3603         return (PF_DROP);
3604 }
3605
3606 static int
3607 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3608     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3609     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3610     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3611     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3612 {
3613         struct pf_state         *s = NULL;
3614         struct pf_src_node      *sn = NULL;
3615         struct tcphdr           *th = pd->hdr.tcp;
3616         u_int16_t                mss = V_tcp_mssdflt;
3617         u_short                  reason;
3618
3619         /* check maximums */
3620         if (r->max_states &&
3621             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3622                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3623                 REASON_SET(&reason, PFRES_MAXSTATES);
3624                 goto csfailed;
3625         }
3626         /* src node for filter rule */
3627         if ((r->rule_flag & PFRULE_SRCTRACK ||
3628             r->rpool.opts & PF_POOL_STICKYADDR) &&
3629             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3630                 REASON_SET(&reason, PFRES_SRCLIMIT);
3631                 goto csfailed;
3632         }
3633         /* src node for translation rule */
3634         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3635             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3636                 REASON_SET(&reason, PFRES_SRCLIMIT);
3637                 goto csfailed;
3638         }
3639         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3640         if (s == NULL) {
3641                 REASON_SET(&reason, PFRES_MEMORY);
3642                 goto csfailed;
3643         }
3644         s->rule.ptr = r;
3645         s->nat_rule.ptr = nr;
3646         s->anchor.ptr = a;
3647         STATE_INC_COUNTERS(s);
3648         if (r->allow_opts)
3649                 s->state_flags |= PFSTATE_ALLOWOPTS;
3650         if (r->rule_flag & PFRULE_STATESLOPPY)
3651                 s->state_flags |= PFSTATE_SLOPPY;
3652         s->log = r->log & PF_LOG_ALL;
3653         s->sync_state = PFSYNC_S_NONE;
3654         if (nr != NULL)
3655                 s->log |= nr->log & PF_LOG_ALL;
3656         switch (pd->proto) {
3657         case IPPROTO_TCP:
3658                 s->src.seqlo = ntohl(th->th_seq);
3659                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3660                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3661                     r->keep_state == PF_STATE_MODULATE) {
3662                         /* Generate sequence number modulator */
3663                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3664                             0)
3665                                 s->src.seqdiff = 1;
3666                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3667                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3668                         *rewrite = 1;
3669                 } else
3670                         s->src.seqdiff = 0;
3671                 if (th->th_flags & TH_SYN) {
3672                         s->src.seqhi++;
3673                         s->src.wscale = pf_get_wscale(m, off,
3674                             th->th_off, pd->af);
3675                 }
3676                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3677                 if (s->src.wscale & PF_WSCALE_MASK) {
3678                         /* Remove scale factor from initial window */
3679                         int win = s->src.max_win;
3680                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3681                         s->src.max_win = (win - 1) >>
3682                             (s->src.wscale & PF_WSCALE_MASK);
3683                 }
3684                 if (th->th_flags & TH_FIN)
3685                         s->src.seqhi++;
3686                 s->dst.seqhi = 1;
3687                 s->dst.max_win = 1;
3688                 s->src.state = TCPS_SYN_SENT;
3689                 s->dst.state = TCPS_CLOSED;
3690                 s->timeout = PFTM_TCP_FIRST_PACKET;
3691                 break;
3692         case IPPROTO_UDP:
3693                 s->src.state = PFUDPS_SINGLE;
3694                 s->dst.state = PFUDPS_NO_TRAFFIC;
3695                 s->timeout = PFTM_UDP_FIRST_PACKET;
3696                 break;
3697         case IPPROTO_ICMP:
3698 #ifdef INET6
3699         case IPPROTO_ICMPV6:
3700 #endif
3701                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3702                 break;
3703         default:
3704                 s->src.state = PFOTHERS_SINGLE;
3705                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3706                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3707         }
3708
3709         if (r->rt) {
3710                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3711                         REASON_SET(&reason, PFRES_MAPFAILED);
3712                         pf_src_tree_remove_state(s);
3713                         STATE_DEC_COUNTERS(s);
3714                         uma_zfree(V_pf_state_z, s);
3715                         goto csfailed;
3716                 }
3717                 s->rt_kif = r->rpool.cur->kif;
3718         }
3719
3720         s->creation = time_uptime;
3721         s->expire = time_uptime;
3722
3723         if (sn != NULL)
3724                 s->src_node = sn;
3725         if (nsn != NULL) {
3726                 /* XXX We only modify one side for now. */
3727                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3728                 s->nat_src_node = nsn;
3729         }
3730         if (pd->proto == IPPROTO_TCP) {
3731                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3732                     off, pd, th, &s->src, &s->dst)) {
3733                         REASON_SET(&reason, PFRES_MEMORY);
3734                         pf_src_tree_remove_state(s);
3735                         STATE_DEC_COUNTERS(s);
3736                         uma_zfree(V_pf_state_z, s);
3737                         return (PF_DROP);
3738                 }
3739                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3740                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3741                     &s->src, &s->dst, rewrite)) {
3742                         /* This really shouldn't happen!!! */
3743                         DPFPRINTF(PF_DEBUG_URGENT,
3744                             ("pf_normalize_tcp_stateful failed on first pkt"));
3745                         pf_normalize_tcp_cleanup(s);
3746                         pf_src_tree_remove_state(s);
3747                         STATE_DEC_COUNTERS(s);
3748                         uma_zfree(V_pf_state_z, s);
3749                         return (PF_DROP);
3750                 }
3751         }
3752         s->direction = pd->dir;
3753
3754         /*
3755          * sk/nk could already been setup by pf_get_translation().
3756          */
3757         if (nr == NULL) {
3758                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3759                     __func__, nr, sk, nk));
3760                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3761                 if (sk == NULL)
3762                         goto csfailed;
3763                 nk = sk;
3764         } else
3765                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3766                     __func__, nr, sk, nk));
3767
3768         /* Swap sk/nk for PF_OUT. */
3769         if (pf_state_insert(BOUND_IFACE(r, kif),
3770             (pd->dir == PF_IN) ? sk : nk,
3771             (pd->dir == PF_IN) ? nk : sk, s)) {
3772                 if (pd->proto == IPPROTO_TCP)
3773                         pf_normalize_tcp_cleanup(s);
3774                 REASON_SET(&reason, PFRES_STATEINS);
3775                 pf_src_tree_remove_state(s);
3776                 STATE_DEC_COUNTERS(s);
3777                 uma_zfree(V_pf_state_z, s);
3778                 return (PF_DROP);
3779         } else
3780                 *sm = s;
3781
3782         if (tag > 0)
3783                 s->tag = tag;
3784         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3785             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3786                 s->src.state = PF_TCPS_PROXY_SRC;
3787                 /* undo NAT changes, if they have taken place */
3788                 if (nr != NULL) {
3789                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3790                         if (pd->dir == PF_OUT)
3791                                 skt = s->key[PF_SK_STACK];
3792                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3793                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3794                         if (pd->sport)
3795                                 *pd->sport = skt->port[pd->sidx];
3796                         if (pd->dport)
3797                                 *pd->dport = skt->port[pd->didx];
3798                         if (pd->proto_sum)
3799                                 *pd->proto_sum = bproto_sum;
3800                         if (pd->ip_sum)
3801                                 *pd->ip_sum = bip_sum;
3802                         m_copyback(m, off, hdrlen, pd->hdr.any);
3803                 }
3804                 s->src.seqhi = htonl(arc4random());
3805                 /* Find mss option */
3806                 int rtid = M_GETFIB(m);
3807                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3808                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3809                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3810                 s->src.mss = mss;
3811                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3812                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3813                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3814                 REASON_SET(&reason, PFRES_SYNPROXY);
3815                 return (PF_SYNPROXY_DROP);
3816         }
3817
3818         return (PF_PASS);
3819
3820 csfailed:
3821         if (sk != NULL)
3822                 uma_zfree(V_pf_state_key_z, sk);
3823         if (nk != NULL)
3824                 uma_zfree(V_pf_state_key_z, nk);
3825
3826         if (sn != NULL) {
3827                 struct pf_srchash *sh;
3828
3829                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
3830                 PF_HASHROW_LOCK(sh);
3831                 if (--sn->states == 0 && sn->expire == 0) {
3832                         pf_unlink_src_node(sn);
3833                         uma_zfree(V_pf_sources_z, sn);
3834                         counter_u64_add(
3835                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3836                 }
3837                 PF_HASHROW_UNLOCK(sh);
3838         }
3839
3840         if (nsn != sn && nsn != NULL) {
3841                 struct pf_srchash *sh;
3842
3843                 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
3844                 PF_HASHROW_LOCK(sh);
3845                 if (--nsn->states == 0 && nsn->expire == 0) {
3846                         pf_unlink_src_node(nsn);
3847                         uma_zfree(V_pf_sources_z, nsn);
3848                         counter_u64_add(
3849                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3850                 }
3851                 PF_HASHROW_UNLOCK(sh);
3852         }
3853
3854         return (PF_DROP);
3855 }
3856
3857 static int
3858 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3859     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3860     struct pf_ruleset **rsm)
3861 {
3862         struct pf_rule          *r, *a = NULL;
3863         struct pf_ruleset       *ruleset = NULL;
3864         sa_family_t              af = pd->af;
3865         u_short                  reason;
3866         int                      tag = -1;
3867         int                      asd = 0;
3868         int                      match = 0;
3869         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3870
3871         PF_RULES_RASSERT();
3872
3873         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3874         while (r != NULL) {
3875                 r->evaluations++;
3876                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3877                         r = r->skip[PF_SKIP_IFP].ptr;
3878                 else if (r->direction && r->direction != direction)
3879                         r = r->skip[PF_SKIP_DIR].ptr;
3880                 else if (r->af && r->af != af)
3881                         r = r->skip[PF_SKIP_AF].ptr;
3882                 else if (r->proto && r->proto != pd->proto)
3883                         r = r->skip[PF_SKIP_PROTO].ptr;
3884                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3885                     r->src.neg, kif, M_GETFIB(m)))
3886                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3887                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3888                     r->dst.neg, NULL, M_GETFIB(m)))
3889                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3890                 else if (r->tos && !(r->tos == pd->tos))
3891                         r = TAILQ_NEXT(r, entries);
3892                 else if (r->os_fingerprint != PF_OSFP_ANY)
3893                         r = TAILQ_NEXT(r, entries);
3894                 else if (pd->proto == IPPROTO_UDP &&
3895                     (r->src.port_op || r->dst.port_op))
3896                         r = TAILQ_NEXT(r, entries);
3897                 else if (pd->proto == IPPROTO_TCP &&
3898                     (r->src.port_op || r->dst.port_op || r->flagset))
3899                         r = TAILQ_NEXT(r, entries);
3900                 else if ((pd->proto == IPPROTO_ICMP ||
3901                     pd->proto == IPPROTO_ICMPV6) &&
3902                     (r->type || r->code))
3903                         r = TAILQ_NEXT(r, entries);
3904                 else if (r->prio &&
3905                     !pf_match_ieee8021q_pcp(r->prio, m))
3906                         r = TAILQ_NEXT(r, entries);
3907                 else if (r->prob && r->prob <=
3908                     (arc4random() % (UINT_MAX - 1) + 1))
3909                         r = TAILQ_NEXT(r, entries);
3910                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3911                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3912                         r = TAILQ_NEXT(r, entries);
3913                 else {
3914                         if (r->anchor == NULL) {
3915                                 match = 1;
3916                                 *rm = r;
3917                                 *am = a;
3918                                 *rsm = ruleset;
3919                                 if ((*rm)->quick)
3920                                         break;
3921                                 r = TAILQ_NEXT(r, entries);
3922                         } else
3923                                 pf_step_into_anchor(anchor_stack, &asd,
3924                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3925                                     &match);
3926                 }
3927                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3928                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3929                         break;
3930         }
3931         r = *rm;
3932         a = *am;
3933         ruleset = *rsm;
3934
3935         REASON_SET(&reason, PFRES_MATCH);
3936
3937         if (r->log)
3938                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3939                     1);
3940
3941         if (r->action != PF_PASS)
3942                 return (PF_DROP);
3943
3944         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3945                 REASON_SET(&reason, PFRES_MEMORY);
3946                 return (PF_DROP);
3947         }
3948
3949         return (PF_PASS);
3950 }
3951
3952 static int
3953 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3954         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3955         struct pf_pdesc *pd, u_short *reason, int *copyback)
3956 {
3957         struct tcphdr           *th = pd->hdr.tcp;
3958         u_int16_t                win = ntohs(th->th_win);
3959         u_int32_t                ack, end, seq, orig_seq;
3960         u_int8_t                 sws, dws;
3961         int                      ackskew;
3962
3963         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3964                 sws = src->wscale & PF_WSCALE_MASK;
3965                 dws = dst->wscale & PF_WSCALE_MASK;
3966         } else
3967                 sws = dws = 0;
3968
3969         /*
3970          * Sequence tracking algorithm from Guido van Rooij's paper:
3971          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3972          *      tcp_filtering.ps
3973          */
3974
3975         orig_seq = seq = ntohl(th->th_seq);
3976         if (src->seqlo == 0) {
3977                 /* First packet from this end. Set its state */
3978
3979                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3980                     src->scrub == NULL) {
3981                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3982                                 REASON_SET(reason, PFRES_MEMORY);
3983                                 return (PF_DROP);
3984                         }
3985                 }
3986
3987                 /* Deferred generation of sequence number modulator */
3988                 if (dst->seqdiff && !src->seqdiff) {
3989                         /* use random iss for the TCP server */
3990                         while ((src->seqdiff = arc4random() - seq) == 0)
3991                                 ;
3992                         ack = ntohl(th->th_ack) - dst->seqdiff;
3993                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3994                             src->seqdiff), 0);
3995                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3996                         *copyback = 1;
3997                 } else {
3998                         ack = ntohl(th->th_ack);
3999                 }
4000
4001                 end = seq + pd->p_len;
4002                 if (th->th_flags & TH_SYN) {
4003                         end++;
4004                         if (dst->wscale & PF_WSCALE_FLAG) {
4005                                 src->wscale = pf_get_wscale(m, off, th->th_off,
4006                                     pd->af);
4007                                 if (src->wscale & PF_WSCALE_FLAG) {
4008                                         /* Remove scale factor from initial
4009                                          * window */
4010                                         sws = src->wscale & PF_WSCALE_MASK;
4011                                         win = ((u_int32_t)win + (1 << sws) - 1)
4012                                             >> sws;
4013                                         dws = dst->wscale & PF_WSCALE_MASK;
4014                                 } else {
4015                                         /* fixup other window */
4016                                         dst->max_win <<= dst->wscale &
4017                                             PF_WSCALE_MASK;
4018                                         /* in case of a retrans SYN|ACK */
4019                                         dst->wscale = 0;
4020                                 }
4021                         }
4022                 }
4023                 if (th->th_flags & TH_FIN)
4024                         end++;
4025
4026                 src->seqlo = seq;
4027                 if (src->state < TCPS_SYN_SENT)
4028                         src->state = TCPS_SYN_SENT;
4029
4030                 /*
4031                  * May need to slide the window (seqhi may have been set by
4032                  * the crappy stack check or if we picked up the connection
4033                  * after establishment)
4034                  */
4035                 if (src->seqhi == 1 ||
4036                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4037                         src->seqhi = end + MAX(1, dst->max_win << dws);
4038                 if (win > src->max_win)
4039                         src->max_win = win;
4040
4041         } else {
4042                 ack = ntohl(th->th_ack) - dst->seqdiff;
4043                 if (src->seqdiff) {
4044                         /* Modulate sequence numbers */
4045                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4046                             src->seqdiff), 0);
4047                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4048                         *copyback = 1;
4049                 }
4050                 end = seq + pd->p_len;
4051                 if (th->th_flags & TH_SYN)
4052                         end++;
4053                 if (th->th_flags & TH_FIN)
4054                         end++;
4055         }
4056
4057         if ((th->th_flags & TH_ACK) == 0) {
4058                 /* Let it pass through the ack skew check */
4059                 ack = dst->seqlo;
4060         } else if ((ack == 0 &&
4061             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4062             /* broken tcp stacks do not set ack */
4063             (dst->state < TCPS_SYN_SENT)) {
4064                 /*
4065                  * Many stacks (ours included) will set the ACK number in an
4066                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4067                  */
4068                 ack = dst->seqlo;
4069         }
4070
4071         if (seq == end) {
4072                 /* Ease sequencing restrictions on no data packets */
4073                 seq = src->seqlo;
4074                 end = seq;
4075         }
4076
4077         ackskew = dst->seqlo - ack;
4078
4079
4080         /*
4081          * Need to demodulate the sequence numbers in any TCP SACK options
4082          * (Selective ACK). We could optionally validate the SACK values
4083          * against the current ACK window, either forwards or backwards, but
4084          * I'm not confident that SACK has been implemented properly
4085          * everywhere. It wouldn't surprise me if several stacks accidentally
4086          * SACK too far backwards of previously ACKed data. There really aren't
4087          * any security implications of bad SACKing unless the target stack
4088          * doesn't validate the option length correctly. Someone trying to
4089          * spoof into a TCP connection won't bother blindly sending SACK
4090          * options anyway.
4091          */
4092         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4093                 if (pf_modulate_sack(m, off, pd, th, dst))
4094                         *copyback = 1;
4095         }
4096
4097
4098 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4099         if (SEQ_GEQ(src->seqhi, end) &&
4100             /* Last octet inside other's window space */
4101             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4102             /* Retrans: not more than one window back */
4103             (ackskew >= -MAXACKWINDOW) &&
4104             /* Acking not more than one reassembled fragment backwards */
4105             (ackskew <= (MAXACKWINDOW << sws)) &&
4106             /* Acking not more than one window forward */
4107             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4108             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4109             (pd->flags & PFDESC_IP_REAS) == 0)) {
4110             /* Require an exact/+1 sequence match on resets when possible */
4111
4112                 if (dst->scrub || src->scrub) {
4113                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4114                             *state, src, dst, copyback))
4115                                 return (PF_DROP);
4116                 }
4117
4118                 /* update max window */
4119                 if (src->max_win < win)
4120                         src->max_win = win;
4121                 /* synchronize sequencing */
4122                 if (SEQ_GT(end, src->seqlo))
4123                         src->seqlo = end;
4124                 /* slide the window of what the other end can send */
4125                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4126                         dst->seqhi = ack + MAX((win << sws), 1);
4127
4128
4129                 /* update states */
4130                 if (th->th_flags & TH_SYN)
4131                         if (src->state < TCPS_SYN_SENT)
4132                                 src->state = TCPS_SYN_SENT;
4133                 if (th->th_flags & TH_FIN)
4134                         if (src->state < TCPS_CLOSING)
4135                                 src->state = TCPS_CLOSING;
4136                 if (th->th_flags & TH_ACK) {
4137                         if (dst->state == TCPS_SYN_SENT) {
4138                                 dst->state = TCPS_ESTABLISHED;
4139                                 if (src->state == TCPS_ESTABLISHED &&
4140                                     (*state)->src_node != NULL &&
4141                                     pf_src_connlimit(state)) {
4142                                         REASON_SET(reason, PFRES_SRCLIMIT);
4143                                         return (PF_DROP);
4144                                 }
4145                         } else if (dst->state == TCPS_CLOSING)
4146                                 dst->state = TCPS_FIN_WAIT_2;
4147                 }
4148                 if (th->th_flags & TH_RST)
4149                         src->state = dst->state = TCPS_TIME_WAIT;
4150
4151                 /* update expire time */
4152                 (*state)->expire = time_uptime;
4153                 if (src->state >= TCPS_FIN_WAIT_2 &&
4154                     dst->state >= TCPS_FIN_WAIT_2)
4155                         (*state)->timeout = PFTM_TCP_CLOSED;
4156                 else if (src->state >= TCPS_CLOSING &&
4157                     dst->state >= TCPS_CLOSING)
4158                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4159                 else if (src->state < TCPS_ESTABLISHED ||
4160                     dst->state < TCPS_ESTABLISHED)
4161                         (*state)->timeout = PFTM_TCP_OPENING;
4162                 else if (src->state >= TCPS_CLOSING ||
4163                     dst->state >= TCPS_CLOSING)
4164                         (*state)->timeout = PFTM_TCP_CLOSING;
4165                 else
4166                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4167
4168                 /* Fall through to PASS packet */
4169
4170         } else if ((dst->state < TCPS_SYN_SENT ||
4171                 dst->state >= TCPS_FIN_WAIT_2 ||
4172                 src->state >= TCPS_FIN_WAIT_2) &&
4173             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4174             /* Within a window forward of the originating packet */
4175             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4176             /* Within a window backward of the originating packet */
4177
4178                 /*
4179                  * This currently handles three situations:
4180                  *  1) Stupid stacks will shotgun SYNs before their peer
4181                  *     replies.
4182                  *  2) When PF catches an already established stream (the
4183                  *     firewall rebooted, the state table was flushed, routes
4184                  *     changed...)
4185                  *  3) Packets get funky immediately after the connection
4186                  *     closes (this should catch Solaris spurious ACK|FINs
4187                  *     that web servers like to spew after a close)
4188                  *
4189                  * This must be a little more careful than the above code
4190                  * since packet floods will also be caught here. We don't
4191                  * update the TTL here to mitigate the damage of a packet
4192                  * flood and so the same code can handle awkward establishment
4193                  * and a loosened connection close.
4194                  * In the establishment case, a correct peer response will
4195                  * validate the connection, go through the normal state code
4196                  * and keep updating the state TTL.
4197                  */
4198
4199                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4200                         printf("pf: loose state match: ");
4201                         pf_print_state(*state);
4202                         pf_print_flags(th->th_flags);
4203                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4204                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4205                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4206                             (unsigned long long)(*state)->packets[1],
4207                             pd->dir == PF_IN ? "in" : "out",
4208                             pd->dir == (*state)->direction ? "fwd" : "rev");
4209                 }
4210
4211                 if (dst->scrub || src->scrub) {
4212                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4213                             *state, src, dst, copyback))
4214                                 return (PF_DROP);
4215                 }
4216
4217                 /* update max window */
4218                 if (src->max_win < win)
4219                         src->max_win = win;
4220                 /* synchronize sequencing */
4221                 if (SEQ_GT(end, src->seqlo))
4222                         src->seqlo = end;
4223                 /* slide the window of what the other end can send */
4224                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4225                         dst->seqhi = ack + MAX((win << sws), 1);
4226
4227                 /*
4228                  * Cannot set dst->seqhi here since this could be a shotgunned
4229                  * SYN and not an already established connection.
4230                  */
4231
4232                 if (th->th_flags & TH_FIN)
4233                         if (src->state < TCPS_CLOSING)
4234                                 src->state = TCPS_CLOSING;
4235                 if (th->th_flags & TH_RST)
4236                         src->state = dst->state = TCPS_TIME_WAIT;
4237
4238                 /* Fall through to PASS packet */
4239
4240         } else {
4241                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4242                     (*state)->src.state == TCPS_SYN_SENT) {
4243                         /* Send RST for state mismatches during handshake */
4244                         if (!(th->th_flags & TH_RST))
4245                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4246                                     pd->dst, pd->src, th->th_dport,
4247                                     th->th_sport, ntohl(th->th_ack), 0,
4248                                     TH_RST, 0, 0,
4249                                     (*state)->rule.ptr->return_ttl, 1, 0,
4250                                     kif->pfik_ifp);
4251                         src->seqlo = 0;
4252                         src->seqhi = 1;
4253                         src->max_win = 1;
4254                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4255                         printf("pf: BAD state: ");
4256                         pf_print_state(*state);
4257                         pf_print_flags(th->th_flags);
4258                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4259                             "pkts=%llu:%llu dir=%s,%s\n",
4260                             seq, orig_seq, ack, pd->p_len, ackskew,
4261                             (unsigned long long)(*state)->packets[0],
4262                             (unsigned long long)(*state)->packets[1],
4263                             pd->dir == PF_IN ? "in" : "out",
4264                             pd->dir == (*state)->direction ? "fwd" : "rev");
4265                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4266                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4267                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4268                             ' ': '2',
4269                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4270                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4271                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4272                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4273                 }
4274                 REASON_SET(reason, PFRES_BADSTATE);
4275                 return (PF_DROP);
4276         }
4277
4278         return (PF_PASS);
4279 }
4280
4281 static int
4282 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4283         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4284 {
4285         struct tcphdr           *th = pd->hdr.tcp;
4286
4287         if (th->th_flags & TH_SYN)
4288                 if (src->state < TCPS_SYN_SENT)
4289                         src->state = TCPS_SYN_SENT;
4290         if (th->th_flags & TH_FIN)
4291                 if (src->state < TCPS_CLOSING)
4292                         src->state = TCPS_CLOSING;
4293         if (th->th_flags & TH_ACK) {
4294                 if (dst->state == TCPS_SYN_SENT) {
4295                         dst->state = TCPS_ESTABLISHED;
4296                         if (src->state == TCPS_ESTABLISHED &&
4297                             (*state)->src_node != NULL &&
4298                             pf_src_connlimit(state)) {
4299                                 REASON_SET(reason, PFRES_SRCLIMIT);
4300                                 return (PF_DROP);
4301                         }
4302                 } else if (dst->state == TCPS_CLOSING) {
4303                         dst->state = TCPS_FIN_WAIT_2;
4304                 } else if (src->state == TCPS_SYN_SENT &&
4305                     dst->state < TCPS_SYN_SENT) {
4306                         /*
4307                          * Handle a special sloppy case where we only see one
4308                          * half of the connection. If there is a ACK after
4309                          * the initial SYN without ever seeing a packet from
4310                          * the destination, set the connection to established.
4311                          */
4312                         dst->state = src->state = TCPS_ESTABLISHED;
4313                         if ((*state)->src_node != NULL &&
4314                             pf_src_connlimit(state)) {
4315                                 REASON_SET(reason, PFRES_SRCLIMIT);
4316                                 return (PF_DROP);
4317                         }
4318                 } else if (src->state == TCPS_CLOSING &&
4319                     dst->state == TCPS_ESTABLISHED &&
4320                     dst->seqlo == 0) {
4321                         /*
4322                          * Handle the closing of half connections where we
4323                          * don't see the full bidirectional FIN/ACK+ACK
4324                          * handshake.
4325                          */
4326                         dst->state = TCPS_CLOSING;
4327                 }
4328         }
4329         if (th->th_flags & TH_RST)
4330                 src->state = dst->state = TCPS_TIME_WAIT;
4331
4332         /* update expire time */
4333         (*state)->expire = time_uptime;
4334         if (src->state >= TCPS_FIN_WAIT_2 &&
4335             dst->state >= TCPS_FIN_WAIT_2)
4336                 (*state)->timeout = PFTM_TCP_CLOSED;
4337         else if (src->state >= TCPS_CLOSING &&
4338             dst->state >= TCPS_CLOSING)
4339                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4340         else if (src->state < TCPS_ESTABLISHED ||
4341             dst->state < TCPS_ESTABLISHED)
4342                 (*state)->timeout = PFTM_TCP_OPENING;
4343         else if (src->state >= TCPS_CLOSING ||
4344             dst->state >= TCPS_CLOSING)
4345                 (*state)->timeout = PFTM_TCP_CLOSING;
4346         else
4347                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4348
4349         return (PF_PASS);
4350 }
4351
4352 static int
4353 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4354     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4355     u_short *reason)
4356 {
4357         struct pf_state_key_cmp  key;
4358         struct tcphdr           *th = pd->hdr.tcp;
4359         int                      copyback = 0;
4360         struct pf_state_peer    *src, *dst;
4361         struct pf_state_key     *sk;
4362
4363         bzero(&key, sizeof(key));
4364         key.af = pd->af;
4365         key.proto = IPPROTO_TCP;
4366         if (direction == PF_IN) {       /* wire side, straight */
4367                 PF_ACPY(&key.addr[0], pd->src, key.af);
4368                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4369                 key.port[0] = th->th_sport;
4370                 key.port[1] = th->th_dport;
4371         } else {                        /* stack side, reverse */
4372                 PF_ACPY(&key.addr[1], pd->src, key.af);
4373                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4374                 key.port[1] = th->th_sport;
4375                 key.port[0] = th->th_dport;
4376         }
4377
4378         STATE_LOOKUP(kif, &key, direction, *state, pd);
4379
4380         if (direction == (*state)->direction) {
4381                 src = &(*state)->src;
4382                 dst = &(*state)->dst;
4383         } else {
4384                 src = &(*state)->dst;
4385                 dst = &(*state)->src;
4386         }
4387
4388         sk = (*state)->key[pd->didx];
4389
4390         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4391                 if (direction != (*state)->direction) {
4392                         REASON_SET(reason, PFRES_SYNPROXY);
4393                         return (PF_SYNPROXY_DROP);
4394                 }
4395                 if (th->th_flags & TH_SYN) {
4396                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4397                                 REASON_SET(reason, PFRES_SYNPROXY);
4398                                 return (PF_DROP);
4399                         }
4400                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4401                             pd->src, th->th_dport, th->th_sport,
4402                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4403                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4404                         REASON_SET(reason, PFRES_SYNPROXY);
4405                         return (PF_SYNPROXY_DROP);
4406                 } else if ((th->th_flags & (TH_ACK|TH_RST|TH_FIN)) != TH_ACK ||
4407                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4408                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4409                         REASON_SET(reason, PFRES_SYNPROXY);
4410                         return (PF_DROP);
4411                 } else if ((*state)->src_node != NULL &&
4412                     pf_src_connlimit(state)) {
4413                         REASON_SET(reason, PFRES_SRCLIMIT);
4414                         return (PF_DROP);
4415                 } else
4416                         (*state)->src.state = PF_TCPS_PROXY_DST;
4417         }
4418         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4419                 if (direction == (*state)->direction) {
4420                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4421                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4422                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4423                                 REASON_SET(reason, PFRES_SYNPROXY);
4424                                 return (PF_DROP);
4425                         }
4426                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4427                         if ((*state)->dst.seqhi == 1)
4428                                 (*state)->dst.seqhi = htonl(arc4random());
4429                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4430                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4431                             sk->port[pd->sidx], sk->port[pd->didx],
4432                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4433                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4434                         REASON_SET(reason, PFRES_SYNPROXY);
4435                         return (PF_SYNPROXY_DROP);
4436                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4437                     (TH_SYN|TH_ACK)) ||
4438                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4439                         REASON_SET(reason, PFRES_SYNPROXY);
4440                         return (PF_DROP);
4441                 } else {
4442                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4443                         (*state)->dst.seqlo = ntohl(th->th_seq);
4444                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4445                             pd->src, th->th_dport, th->th_sport,
4446                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4447                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4448                             (*state)->tag, NULL);
4449                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4450                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4451                             sk->port[pd->sidx], sk->port[pd->didx],
4452                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4453                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4454                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4455                             (*state)->src.seqlo;
4456                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4457                             (*state)->dst.seqlo;
4458                         (*state)->src.seqhi = (*state)->src.seqlo +
4459                             (*state)->dst.max_win;
4460                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4461                             (*state)->src.max_win;
4462                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4463                         (*state)->src.state = (*state)->dst.state =
4464                             TCPS_ESTABLISHED;
4465                         REASON_SET(reason, PFRES_SYNPROXY);
4466                         return (PF_SYNPROXY_DROP);
4467                 }
4468         }
4469
4470         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4471             dst->state >= TCPS_FIN_WAIT_2 &&
4472             src->state >= TCPS_FIN_WAIT_2) {
4473                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4474                         printf("pf: state reuse ");
4475                         pf_print_state(*state);
4476                         pf_print_flags(th->th_flags);
4477                         printf("\n");
4478                 }
4479                 /* XXX make sure it's the same direction ?? */
4480                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4481                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4482                 *state = NULL;
4483                 return (PF_DROP);
4484         }
4485
4486         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4487                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4488                         return (PF_DROP);
4489         } else {
4490                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4491                     &copyback) == PF_DROP)
4492                         return (PF_DROP);
4493         }
4494
4495         /* translate source/destination address, if necessary */
4496         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4497                 struct pf_state_key *nk = (*state)->key[pd->didx];
4498
4499                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4500                     nk->port[pd->sidx] != th->th_sport)
4501                         pf_change_ap(m, pd->src, &th->th_sport,
4502                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4503                             nk->port[pd->sidx], 0, pd->af);
4504
4505                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4506                     nk->port[pd->didx] != th->th_dport)
4507                         pf_change_ap(m, pd->dst, &th->th_dport,
4508                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4509                             nk->port[pd->didx], 0, pd->af);
4510                 copyback = 1;
4511         }
4512
4513         /* Copyback sequence modulation or stateful scrub changes if needed */
4514         if (copyback)
4515                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4516
4517         return (PF_PASS);
4518 }
4519
4520 static int
4521 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4522     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4523 {
4524         struct pf_state_peer    *src, *dst;
4525         struct pf_state_key_cmp  key;
4526         struct udphdr           *uh = pd->hdr.udp;
4527
4528         bzero(&key, sizeof(key));
4529         key.af = pd->af;
4530         key.proto = IPPROTO_UDP;
4531         if (direction == PF_IN) {       /* wire side, straight */
4532                 PF_ACPY(&key.addr[0], pd->src, key.af);
4533                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4534                 key.port[0] = uh->uh_sport;
4535                 key.port[1] = uh->uh_dport;
4536         } else {                        /* stack side, reverse */
4537                 PF_ACPY(&key.addr[1], pd->src, key.af);
4538                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4539                 key.port[1] = uh->uh_sport;
4540                 key.port[0] = uh->uh_dport;
4541         }
4542
4543         STATE_LOOKUP(kif, &key, direction, *state, pd);
4544
4545         if (direction == (*state)->direction) {
4546                 src = &(*state)->src;
4547                 dst = &(*state)->dst;
4548         } else {
4549                 src = &(*state)->dst;
4550                 dst = &(*state)->src;
4551         }
4552
4553         /* update states */
4554         if (src->state < PFUDPS_SINGLE)
4555                 src->state = PFUDPS_SINGLE;
4556         if (dst->state == PFUDPS_SINGLE)
4557                 dst->state = PFUDPS_MULTIPLE;
4558
4559         /* update expire time */
4560         (*state)->expire = time_uptime;
4561         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4562                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4563         else
4564                 (*state)->timeout = PFTM_UDP_SINGLE;
4565
4566         /* translate source/destination address, if necessary */
4567         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4568                 struct pf_state_key *nk = (*state)->key[pd->didx];
4569
4570                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4571                     nk->port[pd->sidx] != uh->uh_sport)
4572                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4573                             &uh->uh_sum, &nk->addr[pd->sidx],
4574                             nk->port[pd->sidx], 1, pd->af);
4575
4576                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4577                     nk->port[pd->didx] != uh->uh_dport)
4578                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4579                             &uh->uh_sum, &nk->addr[pd->didx],
4580                             nk->port[pd->didx], 1, pd->af);
4581                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4582         }
4583
4584         return (PF_PASS);
4585 }
4586
4587 static int
4588 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4589     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4590 {
4591         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4592         u_int16_t        icmpid = 0, *icmpsum;
4593         u_int8_t         icmptype;
4594         int              state_icmp = 0;
4595         struct pf_state_key_cmp key;
4596
4597         bzero(&key, sizeof(key));
4598         switch (pd->proto) {
4599 #ifdef INET
4600         case IPPROTO_ICMP:
4601                 icmptype = pd->hdr.icmp->icmp_type;
4602                 icmpid = pd->hdr.icmp->icmp_id;
4603                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4604
4605                 if (icmptype == ICMP_UNREACH ||
4606                     icmptype == ICMP_SOURCEQUENCH ||
4607                     icmptype == ICMP_REDIRECT ||
4608                     icmptype == ICMP_TIMXCEED ||
4609                     icmptype == ICMP_PARAMPROB)
4610                         state_icmp++;
4611                 break;
4612 #endif /* INET */
4613 #ifdef INET6
4614         case IPPROTO_ICMPV6:
4615                 icmptype = pd->hdr.icmp6->icmp6_type;
4616                 icmpid = pd->hdr.icmp6->icmp6_id;
4617                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4618
4619                 if (icmptype == ICMP6_DST_UNREACH ||
4620                     icmptype == ICMP6_PACKET_TOO_BIG ||
4621                     icmptype == ICMP6_TIME_EXCEEDED ||
4622                     icmptype == ICMP6_PARAM_PROB)
4623                         state_icmp++;
4624                 break;
4625 #endif /* INET6 */
4626         }
4627
4628         if (!state_icmp) {
4629
4630                 /*
4631                  * ICMP query/reply message not related to a TCP/UDP packet.
4632                  * Search for an ICMP state.
4633                  */
4634                 key.af = pd->af;
4635                 key.proto = pd->proto;
4636                 key.port[0] = key.port[1] = icmpid;
4637                 if (direction == PF_IN) {       /* wire side, straight */
4638                         PF_ACPY(&key.addr[0], pd->src, key.af);
4639                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4640                 } else {                        /* stack side, reverse */
4641                         PF_ACPY(&key.addr[1], pd->src, key.af);
4642                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4643                 }
4644
4645                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4646
4647                 (*state)->expire = time_uptime;
4648                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4649
4650                 /* translate source/destination address, if necessary */
4651                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4652                         struct pf_state_key *nk = (*state)->key[pd->didx];
4653
4654                         switch (pd->af) {
4655 #ifdef INET
4656                         case AF_INET:
4657                                 if (PF_ANEQ(pd->src,
4658                                     &nk->addr[pd->sidx], AF_INET))
4659                                         pf_change_a(&saddr->v4.s_addr,
4660                                             pd->ip_sum,
4661                                             nk->addr[pd->sidx].v4.s_addr, 0);
4662
4663                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4664                                     AF_INET))
4665                                         pf_change_a(&daddr->v4.s_addr,
4666                                             pd->ip_sum,
4667                                             nk->addr[pd->didx].v4.s_addr, 0);
4668
4669                                 if (nk->port[0] !=
4670                                     pd->hdr.icmp->icmp_id) {
4671                                         pd->hdr.icmp->icmp_cksum =
4672                                             pf_cksum_fixup(
4673                                             pd->hdr.icmp->icmp_cksum, icmpid,
4674                                             nk->port[pd->sidx], 0);
4675                                         pd->hdr.icmp->icmp_id =
4676                                             nk->port[pd->sidx];
4677                                 }
4678
4679                                 m_copyback(m, off, ICMP_MINLEN,
4680                                     (caddr_t )pd->hdr.icmp);
4681                                 break;
4682 #endif /* INET */
4683 #ifdef INET6
4684                         case AF_INET6:
4685                                 if (PF_ANEQ(pd->src,
4686                                     &nk->addr[pd->sidx], AF_INET6))
4687                                         pf_change_a6(saddr,
4688                                             &pd->hdr.icmp6->icmp6_cksum,
4689                                             &nk->addr[pd->sidx], 0);
4690
4691                                 if (PF_ANEQ(pd->dst,
4692                                     &nk->addr[pd->didx], AF_INET6))
4693                                         pf_change_a6(daddr,
4694                                             &pd->hdr.icmp6->icmp6_cksum,
4695                                             &nk->addr[pd->didx], 0);
4696
4697                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4698                                     (caddr_t )pd->hdr.icmp6);
4699                                 break;
4700 #endif /* INET6 */
4701                         }
4702                 }
4703                 return (PF_PASS);
4704
4705         } else {
4706                 /*
4707                  * ICMP error message in response to a TCP/UDP packet.
4708                  * Extract the inner TCP/UDP header and search for that state.
4709                  */
4710
4711                 struct pf_pdesc pd2;
4712                 bzero(&pd2, sizeof pd2);
4713 #ifdef INET
4714                 struct ip       h2;
4715 #endif /* INET */
4716 #ifdef INET6
4717                 struct ip6_hdr  h2_6;
4718                 int             terminal = 0;
4719 #endif /* INET6 */
4720                 int             ipoff2 = 0;
4721                 int             off2 = 0;
4722
4723                 pd2.af = pd->af;
4724                 /* Payload packet is from the opposite direction. */
4725                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4726                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4727                 switch (pd->af) {
4728 #ifdef INET
4729                 case AF_INET:
4730                         /* offset of h2 in mbuf chain */
4731                         ipoff2 = off + ICMP_MINLEN;
4732
4733                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4734                             NULL, reason, pd2.af)) {
4735                                 DPFPRINTF(PF_DEBUG_MISC,
4736                                     ("pf: ICMP error message too short "
4737                                     "(ip)\n"));
4738                                 return (PF_DROP);
4739                         }
4740                         /*
4741                          * ICMP error messages don't refer to non-first
4742                          * fragments
4743                          */
4744                         if (h2.ip_off & htons(IP_OFFMASK)) {
4745                                 REASON_SET(reason, PFRES_FRAG);
4746                                 return (PF_DROP);
4747                         }
4748
4749                         /* offset of protocol header that follows h2 */
4750                         off2 = ipoff2 + (h2.ip_hl << 2);
4751
4752                         pd2.proto = h2.ip_p;
4753                         pd2.src = (struct pf_addr *)&h2.ip_src;
4754                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4755                         pd2.ip_sum = &h2.ip_sum;
4756                         break;
4757 #endif /* INET */
4758 #ifdef INET6
4759                 case AF_INET6:
4760                         ipoff2 = off + sizeof(struct icmp6_hdr);
4761
4762                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4763                             NULL, reason, pd2.af)) {
4764                                 DPFPRINTF(PF_DEBUG_MISC,
4765                                     ("pf: ICMP error message too short "
4766                                     "(ip6)\n"));
4767                                 return (PF_DROP);
4768                         }
4769                         pd2.proto = h2_6.ip6_nxt;
4770                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4771                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4772                         pd2.ip_sum = NULL;
4773                         off2 = ipoff2 + sizeof(h2_6);
4774                         do {
4775                                 switch (pd2.proto) {
4776                                 case IPPROTO_FRAGMENT:
4777                                         /*
4778                                          * ICMPv6 error messages for
4779                                          * non-first fragments
4780                                          */
4781                                         REASON_SET(reason, PFRES_FRAG);
4782                                         return (PF_DROP);
4783                                 case IPPROTO_AH:
4784                                 case IPPROTO_HOPOPTS:
4785                                 case IPPROTO_ROUTING:
4786                                 case IPPROTO_DSTOPTS: {
4787                                         /* get next header and header length */
4788                                         struct ip6_ext opt6;
4789
4790                                         if (!pf_pull_hdr(m, off2, &opt6,
4791                                             sizeof(opt6), NULL, reason,
4792                                             pd2.af)) {
4793                                                 DPFPRINTF(PF_DEBUG_MISC,
4794                                                     ("pf: ICMPv6 short opt\n"));
4795                                                 return (PF_DROP);
4796                                         }
4797                                         if (pd2.proto == IPPROTO_AH)
4798                                                 off2 += (opt6.ip6e_len + 2) * 4;
4799                                         else
4800                                                 off2 += (opt6.ip6e_len + 1) * 8;
4801                                         pd2.proto = opt6.ip6e_nxt;
4802                                         /* goto the next header */
4803                                         break;
4804                                 }
4805                                 default:
4806                                         terminal++;
4807                                         break;
4808                                 }
4809                         } while (!terminal);
4810                         break;
4811 #endif /* INET6 */
4812                 }
4813
4814                 switch (pd2.proto) {
4815                 case IPPROTO_TCP: {
4816                         struct tcphdr            th;
4817                         u_int32_t                seq;
4818                         struct pf_state_peer    *src, *dst;
4819                         u_int8_t                 dws;
4820                         int                      copyback = 0;
4821
4822                         /*
4823                          * Only the first 8 bytes of the TCP header can be
4824                          * expected. Don't access any TCP header fields after
4825                          * th_seq, an ackskew test is not possible.
4826                          */
4827                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4828                             pd2.af)) {
4829                                 DPFPRINTF(PF_DEBUG_MISC,
4830                                     ("pf: ICMP error message too short "
4831                                     "(tcp)\n"));
4832                                 return (PF_DROP);
4833                         }
4834
4835                         key.af = pd2.af;
4836                         key.proto = IPPROTO_TCP;
4837                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4838                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4839                         key.port[pd2.sidx] = th.th_sport;
4840                         key.port[pd2.didx] = th.th_dport;
4841
4842                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4843
4844                         if (direction == (*state)->direction) {
4845                                 src = &(*state)->dst;
4846                                 dst = &(*state)->src;
4847                         } else {
4848                                 src = &(*state)->src;
4849                                 dst = &(*state)->dst;
4850                         }
4851
4852                         if (src->wscale && dst->wscale)
4853                                 dws = dst->wscale & PF_WSCALE_MASK;
4854                         else
4855                                 dws = 0;
4856
4857                         /* Demodulate sequence number */
4858                         seq = ntohl(th.th_seq) - src->seqdiff;
4859                         if (src->seqdiff) {
4860                                 pf_change_a(&th.th_seq, icmpsum,
4861                                     htonl(seq), 0);
4862                                 copyback = 1;
4863                         }
4864
4865                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4866                             (!SEQ_GEQ(src->seqhi, seq) ||
4867                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4868                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4869                                         printf("pf: BAD ICMP %d:%d ",
4870                                             icmptype, pd->hdr.icmp->icmp_code);
4871                                         pf_print_host(pd->src, 0, pd->af);
4872                                         printf(" -> ");
4873                                         pf_print_host(pd->dst, 0, pd->af);
4874                                         printf(" state: ");
4875                                         pf_print_state(*state);
4876                                         printf(" seq=%u\n", seq);
4877                                 }
4878                                 REASON_SET(reason, PFRES_BADSTATE);
4879                                 return (PF_DROP);
4880                         } else {
4881                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4882                                         printf("pf: OK ICMP %d:%d ",
4883                                             icmptype, pd->hdr.icmp->icmp_code);
4884                                         pf_print_host(pd->src, 0, pd->af);
4885                                         printf(" -> ");
4886                                         pf_print_host(pd->dst, 0, pd->af);
4887                                         printf(" state: ");
4888                                         pf_print_state(*state);
4889                                         printf(" seq=%u\n", seq);
4890                                 }
4891                         }
4892
4893                         /* translate source/destination address, if necessary */
4894                         if ((*state)->key[PF_SK_WIRE] !=
4895                             (*state)->key[PF_SK_STACK]) {
4896                                 struct pf_state_key *nk =
4897                                     (*state)->key[pd->didx];
4898
4899                                 if (PF_ANEQ(pd2.src,
4900                                     &nk->addr[pd2.sidx], pd2.af) ||
4901                                     nk->port[pd2.sidx] != th.th_sport)
4902                                         pf_change_icmp(pd2.src, &th.th_sport,
4903                                             daddr, &nk->addr[pd2.sidx],
4904                                             nk->port[pd2.sidx], NULL,
4905                                             pd2.ip_sum, icmpsum,
4906                                             pd->ip_sum, 0, pd2.af);
4907
4908                                 if (PF_ANEQ(pd2.dst,
4909                                     &nk->addr[pd2.didx], pd2.af) ||
4910                                     nk->port[pd2.didx] != th.th_dport)
4911                                         pf_change_icmp(pd2.dst, &th.th_dport,
4912                                             saddr, &nk->addr[pd2.didx],
4913                                             nk->port[pd2.didx], NULL,
4914                                             pd2.ip_sum, icmpsum,
4915                                             pd->ip_sum, 0, pd2.af);
4916                                 copyback = 1;
4917                         }
4918
4919                         if (copyback) {
4920                                 switch (pd2.af) {
4921 #ifdef INET
4922                                 case AF_INET:
4923                                         m_copyback(m, off, ICMP_MINLEN,
4924                                             (caddr_t )pd->hdr.icmp);
4925                                         m_copyback(m, ipoff2, sizeof(h2),
4926                                             (caddr_t )&h2);
4927                                         break;
4928 #endif /* INET */
4929 #ifdef INET6
4930                                 case AF_INET6:
4931                                         m_copyback(m, off,
4932                                             sizeof(struct icmp6_hdr),
4933                                             (caddr_t )pd->hdr.icmp6);
4934                                         m_copyback(m, ipoff2, sizeof(h2_6),
4935                                             (caddr_t )&h2_6);
4936                                         break;
4937 #endif /* INET6 */
4938                                 }
4939                                 m_copyback(m, off2, 8, (caddr_t)&th);
4940                         }
4941
4942                         return (PF_PASS);
4943                         break;
4944                 }
4945                 case IPPROTO_UDP: {
4946                         struct udphdr           uh;
4947
4948                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4949                             NULL, reason, pd2.af)) {
4950                                 DPFPRINTF(PF_DEBUG_MISC,
4951                                     ("pf: ICMP error message too short "
4952                                     "(udp)\n"));
4953                                 return (PF_DROP);
4954                         }
4955
4956                         key.af = pd2.af;
4957                         key.proto = IPPROTO_UDP;
4958                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4959                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4960                         key.port[pd2.sidx] = uh.uh_sport;
4961                         key.port[pd2.didx] = uh.uh_dport;
4962
4963                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4964
4965                         /* translate source/destination address, if necessary */
4966                         if ((*state)->key[PF_SK_WIRE] !=
4967                             (*state)->key[PF_SK_STACK]) {
4968                                 struct pf_state_key *nk =
4969                                     (*state)->key[pd->didx];
4970
4971                                 if (PF_ANEQ(pd2.src,
4972                                     &nk->addr[pd2.sidx], pd2.af) ||
4973                                     nk->port[pd2.sidx] != uh.uh_sport)
4974                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4975                                             daddr, &nk->addr[pd2.sidx],
4976                                             nk->port[pd2.sidx], &uh.uh_sum,
4977                                             pd2.ip_sum, icmpsum,
4978                                             pd->ip_sum, 1, pd2.af);
4979
4980                                 if (PF_ANEQ(pd2.dst,
4981                                     &nk->addr[pd2.didx], pd2.af) ||
4982                                     nk->port[pd2.didx] != uh.uh_dport)
4983                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4984                                             saddr, &nk->addr[pd2.didx],
4985                                             nk->port[pd2.didx], &uh.uh_sum,
4986                                             pd2.ip_sum, icmpsum,
4987                                             pd->ip_sum, 1, pd2.af);
4988
4989                                 switch (pd2.af) {
4990 #ifdef INET
4991                                 case AF_INET:
4992                                         m_copyback(m, off, ICMP_MINLEN,
4993                                             (caddr_t )pd->hdr.icmp);
4994                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4995                                         break;
4996 #endif /* INET */
4997 #ifdef INET6
4998                                 case AF_INET6:
4999                                         m_copyback(m, off,
5000                                             sizeof(struct icmp6_hdr),
5001                                             (caddr_t )pd->hdr.icmp6);
5002                                         m_copyback(m, ipoff2, sizeof(h2_6),
5003                                             (caddr_t )&h2_6);
5004                                         break;
5005 #endif /* INET6 */
5006                                 }
5007                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
5008                         }
5009                         return (PF_PASS);
5010                         break;
5011                 }
5012 #ifdef INET
5013                 case IPPROTO_ICMP: {
5014                         struct icmp             iih;
5015
5016                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
5017                             NULL, reason, pd2.af)) {
5018                                 DPFPRINTF(PF_DEBUG_MISC,
5019                                     ("pf: ICMP error message too short i"
5020                                     "(icmp)\n"));
5021                                 return (PF_DROP);
5022                         }
5023
5024                         key.af = pd2.af;
5025                         key.proto = IPPROTO_ICMP;
5026                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5027                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5028                         key.port[0] = key.port[1] = iih.icmp_id;
5029
5030                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5031
5032                         /* translate source/destination address, if necessary */
5033                         if ((*state)->key[PF_SK_WIRE] !=
5034                             (*state)->key[PF_SK_STACK]) {
5035                                 struct pf_state_key *nk =
5036                                     (*state)->key[pd->didx];
5037
5038                                 if (PF_ANEQ(pd2.src,
5039                                     &nk->addr[pd2.sidx], pd2.af) ||
5040                                     nk->port[pd2.sidx] != iih.icmp_id)
5041                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5042                                             daddr, &nk->addr[pd2.sidx],
5043                                             nk->port[pd2.sidx], NULL,
5044                                             pd2.ip_sum, icmpsum,
5045                                             pd->ip_sum, 0, AF_INET);
5046
5047                                 if (PF_ANEQ(pd2.dst,
5048                                     &nk->addr[pd2.didx], pd2.af) ||
5049                                     nk->port[pd2.didx] != iih.icmp_id)
5050                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5051                                             saddr, &nk->addr[pd2.didx],
5052                                             nk->port[pd2.didx], NULL,
5053                                             pd2.ip_sum, icmpsum,
5054                                             pd->ip_sum, 0, AF_INET);
5055
5056                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5057                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5058                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5059                         }
5060                         return (PF_PASS);
5061                         break;
5062                 }
5063 #endif /* INET */
5064 #ifdef INET6
5065                 case IPPROTO_ICMPV6: {
5066                         struct icmp6_hdr        iih;
5067
5068                         if (!pf_pull_hdr(m, off2, &iih,
5069                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5070                                 DPFPRINTF(PF_DEBUG_MISC,
5071                                     ("pf: ICMP error message too short "
5072                                     "(icmp6)\n"));
5073                                 return (PF_DROP);
5074                         }
5075
5076                         key.af = pd2.af;
5077                         key.proto = IPPROTO_ICMPV6;
5078                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5079                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5080                         key.port[0] = key.port[1] = iih.icmp6_id;
5081
5082                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5083
5084                         /* translate source/destination address, if necessary */
5085                         if ((*state)->key[PF_SK_WIRE] !=
5086                             (*state)->key[PF_SK_STACK]) {
5087                                 struct pf_state_key *nk =
5088                                     (*state)->key[pd->didx];
5089
5090                                 if (PF_ANEQ(pd2.src,
5091                                     &nk->addr[pd2.sidx], pd2.af) ||
5092                                     nk->port[pd2.sidx] != iih.icmp6_id)
5093                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5094                                             daddr, &nk->addr[pd2.sidx],
5095                                             nk->port[pd2.sidx], NULL,
5096                                             pd2.ip_sum, icmpsum,
5097                                             pd->ip_sum, 0, AF_INET6);
5098
5099                                 if (PF_ANEQ(pd2.dst,
5100                                     &nk->addr[pd2.didx], pd2.af) ||
5101                                     nk->port[pd2.didx] != iih.icmp6_id)
5102                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5103                                             saddr, &nk->addr[pd2.didx],
5104                                             nk->port[pd2.didx], NULL,
5105                                             pd2.ip_sum, icmpsum,
5106                                             pd->ip_sum, 0, AF_INET6);
5107
5108                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5109                                     (caddr_t)pd->hdr.icmp6);
5110                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5111                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5112                                     (caddr_t)&iih);
5113                         }
5114                         return (PF_PASS);
5115                         break;
5116                 }
5117 #endif /* INET6 */
5118                 default: {
5119                         key.af = pd2.af;
5120                         key.proto = pd2.proto;
5121                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5122                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5123                         key.port[0] = key.port[1] = 0;
5124
5125                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5126
5127                         /* translate source/destination address, if necessary */
5128                         if ((*state)->key[PF_SK_WIRE] !=
5129                             (*state)->key[PF_SK_STACK]) {
5130                                 struct pf_state_key *nk =
5131                                     (*state)->key[pd->didx];
5132
5133                                 if (PF_ANEQ(pd2.src,
5134                                     &nk->addr[pd2.sidx], pd2.af))
5135                                         pf_change_icmp(pd2.src, NULL, daddr,
5136                                             &nk->addr[pd2.sidx], 0, NULL,
5137                                             pd2.ip_sum, icmpsum,
5138                                             pd->ip_sum, 0, pd2.af);
5139
5140                                 if (PF_ANEQ(pd2.dst,
5141                                     &nk->addr[pd2.didx], pd2.af))
5142                                         pf_change_icmp(pd2.dst, NULL, saddr,
5143                                             &nk->addr[pd2.didx], 0, NULL,
5144                                             pd2.ip_sum, icmpsum,
5145                                             pd->ip_sum, 0, pd2.af);
5146
5147                                 switch (pd2.af) {
5148 #ifdef INET
5149                                 case AF_INET:
5150                                         m_copyback(m, off, ICMP_MINLEN,
5151                                             (caddr_t)pd->hdr.icmp);
5152                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5153                                         break;
5154 #endif /* INET */
5155 #ifdef INET6
5156                                 case AF_INET6:
5157                                         m_copyback(m, off,
5158                                             sizeof(struct icmp6_hdr),
5159                                             (caddr_t )pd->hdr.icmp6);
5160                                         m_copyback(m, ipoff2, sizeof(h2_6),
5161                                             (caddr_t )&h2_6);
5162                                         break;
5163 #endif /* INET6 */
5164                                 }
5165                         }
5166                         return (PF_PASS);
5167                         break;
5168                 }
5169                 }
5170         }
5171 }
5172
5173 static int
5174 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5175     struct mbuf *m, struct pf_pdesc *pd)
5176 {
5177         struct pf_state_peer    *src, *dst;
5178         struct pf_state_key_cmp  key;
5179
5180         bzero(&key, sizeof(key));
5181         key.af = pd->af;
5182         key.proto = pd->proto;
5183         if (direction == PF_IN) {
5184                 PF_ACPY(&key.addr[0], pd->src, key.af);
5185                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5186                 key.port[0] = key.port[1] = 0;
5187         } else {
5188                 PF_ACPY(&key.addr[1], pd->src, key.af);
5189                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5190                 key.port[1] = key.port[0] = 0;
5191         }
5192
5193         STATE_LOOKUP(kif, &key, direction, *state, pd);
5194
5195         if (direction == (*state)->direction) {
5196                 src = &(*state)->src;
5197                 dst = &(*state)->dst;
5198         } else {
5199                 src = &(*state)->dst;
5200                 dst = &(*state)->src;
5201         }
5202
5203         /* update states */
5204         if (src->state < PFOTHERS_SINGLE)
5205                 src->state = PFOTHERS_SINGLE;
5206         if (dst->state == PFOTHERS_SINGLE)
5207                 dst->state = PFOTHERS_MULTIPLE;
5208
5209         /* update expire time */
5210         (*state)->expire = time_uptime;
5211         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5212                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5213         else
5214                 (*state)->timeout = PFTM_OTHER_SINGLE;
5215
5216         /* translate source/destination address, if necessary */
5217         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5218                 struct pf_state_key *nk = (*state)->key[pd->didx];
5219
5220                 KASSERT(nk, ("%s: nk is null", __func__));
5221                 KASSERT(pd, ("%s: pd is null", __func__));
5222                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
5223                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5224                 switch (pd->af) {
5225 #ifdef INET
5226                 case AF_INET:
5227                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5228                                 pf_change_a(&pd->src->v4.s_addr,
5229                                     pd->ip_sum,
5230                                     nk->addr[pd->sidx].v4.s_addr,
5231                                     0);
5232
5233
5234                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5235                                 pf_change_a(&pd->dst->v4.s_addr,
5236                                     pd->ip_sum,
5237                                     nk->addr[pd->didx].v4.s_addr,
5238                                     0);
5239
5240                                 break;
5241 #endif /* INET */
5242 #ifdef INET6
5243                 case AF_INET6:
5244                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5245                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5246
5247                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5248                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5249 #endif /* INET6 */
5250                 }
5251         }
5252         return (PF_PASS);
5253 }
5254
5255 /*
5256  * ipoff and off are measured from the start of the mbuf chain.
5257  * h must be at "ipoff" on the mbuf chain.
5258  */
5259 void *
5260 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5261     u_short *actionp, u_short *reasonp, sa_family_t af)
5262 {
5263         switch (af) {
5264 #ifdef INET
5265         case AF_INET: {
5266                 struct ip       *h = mtod(m, struct ip *);
5267                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5268
5269                 if (fragoff) {
5270                         if (fragoff >= len)
5271                                 ACTION_SET(actionp, PF_PASS);
5272                         else {
5273                                 ACTION_SET(actionp, PF_DROP);
5274                                 REASON_SET(reasonp, PFRES_FRAG);
5275                         }
5276                         return (NULL);
5277                 }
5278                 if (m->m_pkthdr.len < off + len ||
5279                     ntohs(h->ip_len) < off + len) {
5280                         ACTION_SET(actionp, PF_DROP);
5281                         REASON_SET(reasonp, PFRES_SHORT);
5282                         return (NULL);
5283                 }
5284                 break;
5285         }
5286 #endif /* INET */
5287 #ifdef INET6
5288         case AF_INET6: {
5289                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5290
5291                 if (m->m_pkthdr.len < off + len ||
5292                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5293                     (unsigned)(off + len)) {
5294                         ACTION_SET(actionp, PF_DROP);
5295                         REASON_SET(reasonp, PFRES_SHORT);
5296                         return (NULL);
5297                 }
5298                 break;
5299         }
5300 #endif /* INET6 */
5301         }
5302         m_copydata(m, off, len, p);
5303         return (p);
5304 }
5305
5306 #ifdef RADIX_MPATH
5307 static int
5308 pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5309     int rtableid)
5310 {
5311         struct radix_node_head  *rnh;
5312         struct sockaddr_in      *dst;
5313         int                      ret = 1;
5314         int                      check_mpath;
5315 #ifdef INET6
5316         struct sockaddr_in6     *dst6;
5317         struct route_in6         ro;
5318 #else
5319         struct route             ro;
5320 #endif
5321         struct radix_node       *rn;
5322         struct rtentry          *rt;
5323         struct ifnet            *ifp;
5324
5325         check_mpath = 0;
5326         /* XXX: stick to table 0 for now */
5327         rnh = rt_tables_get_rnh(0, af);
5328         if (rnh != NULL && rn_mpath_capable(rnh))
5329                 check_mpath = 1;
5330         bzero(&ro, sizeof(ro));
5331         switch (af) {
5332         case AF_INET:
5333                 dst = satosin(&ro.ro_dst);
5334                 dst->sin_family = AF_INET;
5335                 dst->sin_len = sizeof(*dst);
5336                 dst->sin_addr = addr->v4;
5337                 break;
5338 #ifdef INET6
5339         case AF_INET6:
5340                 /*
5341                  * Skip check for addresses with embedded interface scope,
5342                  * as they would always match anyway.
5343                  */
5344                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5345                         goto out;
5346                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5347                 dst6->sin6_family = AF_INET6;
5348                 dst6->sin6_len = sizeof(*dst6);
5349                 dst6->sin6_addr = addr->v6;
5350                 break;
5351 #endif /* INET6 */
5352         default:
5353                 return (0);
5354         }
5355
5356         /* Skip checks for ipsec interfaces */
5357         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5358                 goto out;
5359
5360         switch (af) {
5361 #ifdef INET6
5362         case AF_INET6:
5363                 in6_rtalloc_ign(&ro, 0, rtableid);
5364                 break;
5365 #endif
5366 #ifdef INET
5367         case AF_INET:
5368                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5369                 break;
5370 #endif
5371         }
5372
5373         if (ro.ro_rt != NULL) {
5374                 /* No interface given, this is a no-route check */
5375                 if (kif == NULL)
5376                         goto out;
5377
5378                 if (kif->pfik_ifp == NULL) {
5379                         ret = 0;
5380                         goto out;
5381                 }
5382
5383                 /* Perform uRPF check if passed input interface */
5384                 ret = 0;
5385                 rn = (struct radix_node *)ro.ro_rt;
5386                 do {
5387                         rt = (struct rtentry *)rn;
5388                         ifp = rt->rt_ifp;
5389
5390                         if (kif->pfik_ifp == ifp)
5391                                 ret = 1;
5392                         rn = rn_mpath_next(rn);
5393                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5394         } else
5395                 ret = 0;
5396 out:
5397         if (ro.ro_rt != NULL)
5398                 RTFREE(ro.ro_rt);
5399         return (ret);
5400 }
5401 #endif
5402
5403 int
5404 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5405     int rtableid)
5406 {
5407 #ifdef INET
5408         struct nhop4_basic      nh4;
5409 #endif
5410 #ifdef INET6
5411         struct nhop6_basic      nh6;
5412 #endif
5413         struct ifnet            *ifp;
5414 #ifdef RADIX_MPATH
5415         struct radix_node_head  *rnh;
5416
5417         /* XXX: stick to table 0 for now */
5418         rnh = rt_tables_get_rnh(0, af);
5419         if (rnh != NULL && rn_mpath_capable(rnh))
5420                 return (pf_routable_oldmpath(addr, af, kif, rtableid));
5421 #endif
5422         /*
5423          * Skip check for addresses with embedded interface scope,
5424          * as they would always match anyway.
5425          */
5426         if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
5427                 return (1);
5428
5429         if (af != AF_INET && af != AF_INET6)
5430                 return (0);
5431
5432         /* Skip checks for ipsec interfaces */
5433         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5434                 return (1);
5435
5436         ifp = NULL;
5437
5438         switch (af) {
5439 #ifdef INET6
5440         case AF_INET6:
5441                 if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
5442                         return (0);
5443                 ifp = nh6.nh_ifp;
5444                 break;
5445 #endif
5446 #ifdef INET
5447         case AF_INET:
5448                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
5449                         return (0);
5450                 ifp = nh4.nh_ifp;
5451                 break;
5452 #endif
5453         }
5454
5455         /* No interface given, this is a no-route check */
5456         if (kif == NULL)
5457                 return (1);
5458
5459         if (kif->pfik_ifp == NULL)
5460                 return (0);
5461
5462         /* Perform uRPF check if passed input interface */
5463         if (kif->pfik_ifp == ifp)
5464                 return (1);
5465         return (0);
5466 }
5467
5468 #ifdef INET
5469 static void
5470 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5471     struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp)
5472 {
5473         struct mbuf             *m0, *m1;
5474         struct sockaddr_in      dst;
5475         struct ip               *ip;
5476         struct ifnet            *ifp = NULL;
5477         struct pf_addr           naddr;
5478         struct pf_src_node      *sn = NULL;
5479         int                      error = 0;
5480         uint16_t                 ip_len, ip_off;
5481
5482         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5483         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5484             __func__));
5485
5486         if ((pd->pf_mtag == NULL &&
5487             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5488             pd->pf_mtag->routed++ > 3) {
5489                 m0 = *m;
5490                 *m = NULL;
5491                 goto bad_locked;
5492         }
5493
5494         if (r->rt == PF_DUPTO) {
5495                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5496                         if (s)
5497                                 PF_STATE_UNLOCK(s);
5498                         return;
5499                 }
5500         } else {
5501                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5502                         if (s)
5503                                 PF_STATE_UNLOCK(s);
5504                         return;
5505                 }
5506                 m0 = *m;
5507         }
5508
5509         ip = mtod(m0, struct ip *);
5510
5511         bzero(&dst, sizeof(dst));
5512         dst.sin_family = AF_INET;
5513         dst.sin_len = sizeof(dst);
5514         dst.sin_addr = ip->ip_dst;
5515
5516         bzero(&naddr, sizeof(naddr));
5517
5518         if (TAILQ_EMPTY(&r->rpool.list)) {
5519                 DPFPRINTF(PF_DEBUG_URGENT,
5520                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5521                 goto bad_locked;
5522         }
5523         if (s == NULL) {
5524                 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5525                     &naddr, NULL, &sn);
5526                 if (!PF_AZERO(&naddr, AF_INET))
5527                         dst.sin_addr.s_addr = naddr.v4.s_addr;
5528                 ifp = r->rpool.cur->kif ?
5529                     r->rpool.cur->kif->pfik_ifp : NULL;
5530         } else {
5531                 if (!PF_AZERO(&s->rt_addr, AF_INET))
5532                         dst.sin_addr.s_addr =
5533                             s->rt_addr.v4.s_addr;
5534                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5535                 PF_STATE_UNLOCK(s);
5536         }
5537         if (ifp == NULL)
5538                 goto bad;
5539
5540         if (oifp != ifp) {
5541                 if (pf_test(PF_OUT, 0, ifp, &m0, inp) != PF_PASS)
5542                         goto bad;
5543                 else if (m0 == NULL)
5544                         goto done;
5545                 if (m0->m_len < sizeof(struct ip)) {
5546                         DPFPRINTF(PF_DEBUG_URGENT,
5547                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5548                         goto bad;
5549                 }
5550                 ip = mtod(m0, struct ip *);
5551         }
5552
5553         if (ifp->if_flags & IFF_LOOPBACK)
5554                 m0->m_flags |= M_SKIP_FIREWALL;
5555
5556         ip_len = ntohs(ip->ip_len);
5557         ip_off = ntohs(ip->ip_off);
5558
5559         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5560         m0->m_pkthdr.csum_flags |= CSUM_IP;
5561         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5562                 in_delayed_cksum(m0);
5563                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5564         }
5565 #ifdef SCTP
5566         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5567                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5568                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5569         }
5570 #endif
5571
5572         /*
5573          * If small enough for interface, or the interface will take
5574          * care of the fragmentation for us, we can just send directly.
5575          */
5576         if (ip_len <= ifp->if_mtu ||
5577             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
5578                 ip->ip_sum = 0;
5579                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5580                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5581                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5582                 }
5583                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5584                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5585                 goto done;
5586         }
5587
5588         /* Balk when DF bit is set or the interface didn't support TSO. */
5589         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5590                 error = EMSGSIZE;
5591                 KMOD_IPSTAT_INC(ips_cantfrag);
5592                 if (r->rt != PF_DUPTO) {
5593                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5594                             ifp->if_mtu);
5595                         goto done;
5596                 } else
5597                         goto bad;
5598         }
5599
5600         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5601         if (error)
5602                 goto bad;
5603
5604         for (; m0; m0 = m1) {
5605                 m1 = m0->m_nextpkt;
5606                 m0->m_nextpkt = NULL;
5607                 if (error == 0) {
5608                         m_clrprotoflags(m0);
5609                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5610                 } else
5611                         m_freem(m0);
5612         }
5613
5614         if (error == 0)
5615                 KMOD_IPSTAT_INC(ips_fragmented);
5616
5617 done:
5618         if (r->rt != PF_DUPTO)
5619                 *m = NULL;
5620         return;
5621
5622 bad_locked:
5623         if (s)
5624                 PF_STATE_UNLOCK(s);
5625 bad:
5626         m_freem(m0);
5627         goto done;
5628 }
5629 #endif /* INET */
5630
5631 #ifdef INET6
5632 static void
5633 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5634     struct pf_state *s, struct pf_pdesc *pd, struct inpcb *inp)
5635 {
5636         struct mbuf             *m0;
5637         struct sockaddr_in6     dst;
5638         struct ip6_hdr          *ip6;
5639         struct ifnet            *ifp = NULL;
5640         struct pf_addr           naddr;
5641         struct pf_src_node      *sn = NULL;
5642
5643         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5644         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5645             __func__));
5646
5647         if ((pd->pf_mtag == NULL &&
5648             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5649             pd->pf_mtag->routed++ > 3) {
5650                 m0 = *m;
5651                 *m = NULL;
5652                 goto bad_locked;
5653         }
5654
5655         if (r->rt == PF_DUPTO) {
5656                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5657                         if (s)
5658                                 PF_STATE_UNLOCK(s);
5659                         return;
5660                 }
5661         } else {
5662                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5663                         if (s)
5664                                 PF_STATE_UNLOCK(s);
5665                         return;
5666                 }
5667                 m0 = *m;
5668         }
5669
5670         ip6 = mtod(m0, struct ip6_hdr *);
5671
5672         bzero(&dst, sizeof(dst));
5673         dst.sin6_family = AF_INET6;
5674         dst.sin6_len = sizeof(dst);
5675         dst.sin6_addr = ip6->ip6_dst;
5676
5677         bzero(&naddr, sizeof(naddr));
5678
5679         if (TAILQ_EMPTY(&r->rpool.list)) {
5680                 DPFPRINTF(PF_DEBUG_URGENT,
5681                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5682                 goto bad_locked;
5683         }
5684         if (s == NULL) {
5685                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5686                     &naddr, NULL, &sn);
5687                 if (!PF_AZERO(&naddr, AF_INET6))
5688                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5689                             &naddr, AF_INET6);
5690                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5691         } else {
5692                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5693                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5694                             &s->rt_addr, AF_INET6);
5695                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5696         }
5697
5698         if (s)
5699                 PF_STATE_UNLOCK(s);
5700
5701         if (ifp == NULL)
5702                 goto bad;
5703
5704         if (oifp != ifp) {
5705                 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, inp) != PF_PASS)
5706                         goto bad;
5707                 else if (m0 == NULL)
5708                         goto done;
5709                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5710                         DPFPRINTF(PF_DEBUG_URGENT,
5711                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5712                             __func__));
5713                         goto bad;
5714                 }
5715                 ip6 = mtod(m0, struct ip6_hdr *);
5716         }
5717
5718         if (ifp->if_flags & IFF_LOOPBACK)
5719                 m0->m_flags |= M_SKIP_FIREWALL;
5720
5721         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5722             ~ifp->if_hwassist) {
5723                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5724                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5725                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5726         }
5727
5728         /*
5729          * If the packet is too large for the outgoing interface,
5730          * send back an icmp6 error.
5731          */
5732         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5733                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5734         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5735                 nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
5736         else {
5737                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5738                 if (r->rt != PF_DUPTO)
5739                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5740                 else
5741                         goto bad;
5742         }
5743
5744 done:
5745         if (r->rt != PF_DUPTO)
5746                 *m = NULL;
5747         return;
5748
5749 bad_locked:
5750         if (s)
5751                 PF_STATE_UNLOCK(s);
5752 bad:
5753         m_freem(m0);
5754         goto done;
5755 }
5756 #endif /* INET6 */
5757
5758 /*
5759  * FreeBSD supports cksum offloads for the following drivers.
5760  *  em(4), fxp(4), lge(4), ndis(4), nge(4), re(4), ti(4), txp(4), xl(4)
5761  *
5762  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5763  *  network driver performed cksum including pseudo header, need to verify
5764  *   csum_data
5765  * CSUM_DATA_VALID :
5766  *  network driver performed cksum, needs to additional pseudo header
5767  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5768  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5769  *
5770  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5771  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5772  * TCP/UDP layer.
5773  * Also, set csum_data to 0xffff to force cksum validation.
5774  */
5775 static int
5776 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5777 {
5778         u_int16_t sum = 0;
5779         int hw_assist = 0;
5780         struct ip *ip;
5781
5782         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5783                 return (1);
5784         if (m->m_pkthdr.len < off + len)
5785                 return (1);
5786
5787         switch (p) {
5788         case IPPROTO_TCP:
5789                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5790                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5791                                 sum = m->m_pkthdr.csum_data;
5792                         } else {
5793                                 ip = mtod(m, struct ip *);
5794                                 sum = in_pseudo(ip->ip_src.s_addr,
5795                                 ip->ip_dst.s_addr, htonl((u_short)len +
5796                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5797                         }
5798                         sum ^= 0xffff;
5799                         ++hw_assist;
5800                 }
5801                 break;
5802         case IPPROTO_UDP:
5803                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5804                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5805                                 sum = m->m_pkthdr.csum_data;
5806                         } else {
5807                                 ip = mtod(m, struct ip *);
5808                                 sum = in_pseudo(ip->ip_src.s_addr,
5809                                 ip->ip_dst.s_addr, htonl((u_short)len +
5810                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5811                         }
5812                         sum ^= 0xffff;
5813                         ++hw_assist;
5814                 }
5815                 break;
5816         case IPPROTO_ICMP:
5817 #ifdef INET6
5818         case IPPROTO_ICMPV6:
5819 #endif /* INET6 */
5820                 break;
5821         default:
5822                 return (1);
5823         }
5824
5825         if (!hw_assist) {
5826                 switch (af) {
5827                 case AF_INET:
5828                         if (p == IPPROTO_ICMP) {
5829                                 if (m->m_len < off)
5830                                         return (1);
5831                                 m->m_data += off;
5832                                 m->m_len -= off;
5833                                 sum = in_cksum(m, len);
5834                                 m->m_data -= off;
5835                                 m->m_len += off;
5836                         } else {
5837                                 if (m->m_len < sizeof(struct ip))
5838                                         return (1);
5839                                 sum = in4_cksum(m, p, off, len);
5840                         }
5841                         break;
5842 #ifdef INET6
5843                 case AF_INET6:
5844                         if (m->m_len < sizeof(struct ip6_hdr))
5845                                 return (1);
5846                         sum = in6_cksum(m, p, off, len);
5847                         break;
5848 #endif /* INET6 */
5849                 default:
5850                         return (1);
5851                 }
5852         }
5853         if (sum) {
5854                 switch (p) {
5855                 case IPPROTO_TCP:
5856                     {
5857                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5858                         break;
5859                     }
5860                 case IPPROTO_UDP:
5861                     {
5862                         KMOD_UDPSTAT_INC(udps_badsum);
5863                         break;
5864                     }
5865 #ifdef INET
5866                 case IPPROTO_ICMP:
5867                     {
5868                         KMOD_ICMPSTAT_INC(icps_checksum);
5869                         break;
5870                     }
5871 #endif
5872 #ifdef INET6
5873                 case IPPROTO_ICMPV6:
5874                     {
5875                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5876                         break;
5877                     }
5878 #endif /* INET6 */
5879                 }
5880                 return (1);
5881         } else {
5882                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5883                         m->m_pkthdr.csum_flags |=
5884                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5885                         m->m_pkthdr.csum_data = 0xffff;
5886                 }
5887         }
5888         return (0);
5889 }
5890
5891
5892 #ifdef INET
5893 int
5894 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5895 {
5896         struct pfi_kif          *kif;
5897         u_short                  action, reason = 0, log = 0;
5898         struct mbuf             *m = *m0;
5899         struct ip               *h = NULL;
5900         struct m_tag            *ipfwtag;
5901         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5902         struct pf_state         *s = NULL;
5903         struct pf_ruleset       *ruleset = NULL;
5904         struct pf_pdesc          pd;
5905         int                      off, dirndx, pqid = 0;
5906
5907         PF_RULES_RLOCK_TRACKER;
5908
5909         M_ASSERTPKTHDR(m);
5910
5911         if (!V_pf_status.running)
5912                 return (PF_PASS);
5913
5914         memset(&pd, 0, sizeof(pd));
5915
5916         kif = (struct pfi_kif *)ifp->if_pf_kif;
5917
5918         if (kif == NULL) {
5919                 DPFPRINTF(PF_DEBUG_URGENT,
5920                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5921                 return (PF_DROP);
5922         }
5923         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5924                 return (PF_PASS);
5925
5926         if (m->m_flags & M_SKIP_FIREWALL)
5927                 return (PF_PASS);
5928
5929         pd.pf_mtag = pf_find_mtag(m);
5930
5931         PF_RULES_RLOCK();
5932
5933         if (ip_divert_ptr != NULL &&
5934             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5935                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5936                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5937                         if (pd.pf_mtag == NULL &&
5938                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5939                                 action = PF_DROP;
5940                                 goto done;
5941                         }
5942                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5943                         m_tag_delete(m, ipfwtag);
5944                 }
5945                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5946                         m->m_flags |= M_FASTFWD_OURS;
5947                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5948                 }
5949         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5950                 /* We do IP header normalization and packet reassembly here */
5951                 action = PF_DROP;
5952                 goto done;
5953         }
5954         m = *m0;        /* pf_normalize messes with m0 */
5955         h = mtod(m, struct ip *);
5956
5957         off = h->ip_hl << 2;
5958         if (off < (int)sizeof(struct ip)) {
5959                 action = PF_DROP;
5960                 REASON_SET(&reason, PFRES_SHORT);
5961                 log = 1;
5962                 goto done;
5963         }
5964
5965         pd.src = (struct pf_addr *)&h->ip_src;
5966         pd.dst = (struct pf_addr *)&h->ip_dst;
5967         pd.sport = pd.dport = NULL;
5968         pd.ip_sum = &h->ip_sum;
5969         pd.proto_sum = NULL;
5970         pd.proto = h->ip_p;
5971         pd.dir = dir;
5972         pd.sidx = (dir == PF_IN) ? 0 : 1;
5973         pd.didx = (dir == PF_IN) ? 1 : 0;
5974         pd.af = AF_INET;
5975         pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
5976         pd.tot_len = ntohs(h->ip_len);
5977
5978         /* handle fragments that didn't get reassembled by normalization */
5979         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5980                 action = pf_test_fragment(&r, dir, kif, m, h,
5981                     &pd, &a, &ruleset);
5982                 goto done;
5983         }
5984
5985         switch (h->ip_p) {
5986
5987         case IPPROTO_TCP: {
5988                 struct tcphdr   th;
5989
5990                 pd.hdr.tcp = &th;
5991                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5992                     &action, &reason, AF_INET)) {
5993                         log = action != PF_PASS;
5994                         goto done;
5995                 }
5996                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5997                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5998                         pqid = 1;
5999                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6000                 if (action == PF_DROP)
6001                         goto done;
6002                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6003                     &reason);
6004                 if (action == PF_PASS) {
6005                         if (V_pfsync_update_state_ptr != NULL)
6006                                 V_pfsync_update_state_ptr(s);
6007                         r = s->rule.ptr;
6008                         a = s->anchor.ptr;
6009                         log = s->log;
6010                 } else if (s == NULL)
6011                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6012                             &a, &ruleset, inp);
6013                 break;
6014         }
6015
6016         case IPPROTO_UDP: {
6017                 struct udphdr   uh;
6018
6019                 pd.hdr.udp = &uh;
6020                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6021                     &action, &reason, AF_INET)) {
6022                         log = action != PF_PASS;
6023                         goto done;
6024                 }
6025                 if (uh.uh_dport == 0 ||
6026                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6027                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6028                         action = PF_DROP;
6029                         REASON_SET(&reason, PFRES_SHORT);
6030                         goto done;
6031                 }
6032                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6033                 if (action == PF_PASS) {
6034                         if (V_pfsync_update_state_ptr != NULL)
6035                                 V_pfsync_update_state_ptr(s);
6036                         r = s->rule.ptr;
6037                         a = s->anchor.ptr;
6038                         log = s->log;
6039                 } else if (s == NULL)
6040                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6041                             &a, &ruleset, inp);
6042                 break;
6043         }
6044
6045         case IPPROTO_ICMP: {
6046                 struct icmp     ih;
6047
6048                 pd.hdr.icmp = &ih;
6049                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6050                     &action, &reason, AF_INET)) {
6051                         log = action != PF_PASS;
6052                         goto done;
6053                 }
6054                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6055                     &reason);
6056                 if (action == PF_PASS) {
6057                         if (V_pfsync_update_state_ptr != NULL)
6058                                 V_pfsync_update_state_ptr(s);
6059                         r = s->rule.ptr;
6060                         a = s->anchor.ptr;
6061                         log = s->log;
6062                 } else if (s == NULL)
6063                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6064                             &a, &ruleset, inp);
6065                 break;
6066         }
6067
6068 #ifdef INET6
6069         case IPPROTO_ICMPV6: {
6070                 action = PF_DROP;
6071                 DPFPRINTF(PF_DEBUG_MISC,
6072                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6073                 goto done;
6074         }
6075 #endif
6076
6077         default:
6078                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6079                 if (action == PF_PASS) {
6080                         if (V_pfsync_update_state_ptr != NULL)
6081                                 V_pfsync_update_state_ptr(s);
6082                         r = s->rule.ptr;
6083                         a = s->anchor.ptr;
6084                         log = s->log;
6085                 } else if (s == NULL)
6086                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6087                             &a, &ruleset, inp);
6088                 break;
6089         }
6090
6091 done:
6092         PF_RULES_RUNLOCK();
6093         if (action == PF_PASS && h->ip_hl > 5 &&
6094             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6095                 action = PF_DROP;
6096                 REASON_SET(&reason, PFRES_IPOPTIONS);
6097                 log = r->log;
6098                 DPFPRINTF(PF_DEBUG_MISC,
6099                     ("pf: dropping packet with ip options\n"));
6100         }
6101
6102         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6103                 action = PF_DROP;
6104                 REASON_SET(&reason, PFRES_MEMORY);
6105         }
6106         if (r->rtableid >= 0)
6107                 M_SETFIB(m, r->rtableid);
6108
6109         if (r->scrub_flags & PFSTATE_SETPRIO) {
6110                 if (pd.tos & IPTOS_LOWDELAY)
6111                         pqid = 1;
6112                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6113                         action = PF_DROP;
6114                         REASON_SET(&reason, PFRES_MEMORY);
6115                         log = 1;
6116                         DPFPRINTF(PF_DEBUG_MISC,
6117                             ("pf: failed to allocate 802.1q mtag\n"));
6118                 }
6119         }
6120
6121 #ifdef ALTQ
6122         if (action == PF_PASS && r->qid) {
6123                 if (pd.pf_mtag == NULL &&
6124                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6125                         action = PF_DROP;
6126                         REASON_SET(&reason, PFRES_MEMORY);
6127                 } else {
6128                         if (s != NULL)
6129                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6130                         if (pqid || (pd.tos & IPTOS_LOWDELAY))
6131                                 pd.pf_mtag->qid = r->pqid;
6132                         else
6133                                 pd.pf_mtag->qid = r->qid;
6134                         /* Add hints for ecn. */
6135                         pd.pf_mtag->hdr = h;
6136                 }
6137
6138         }
6139 #endif /* ALTQ */
6140
6141         /*
6142          * connections redirected to loopback should not match sockets
6143          * bound specifically to loopback due to security implications,
6144          * see tcp_input() and in_pcblookup_listen().
6145          */
6146         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6147             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6148             (s->nat_rule.ptr->action == PF_RDR ||
6149             s->nat_rule.ptr->action == PF_BINAT) &&
6150             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6151                 m->m_flags |= M_SKIP_FIREWALL;
6152
6153         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
6154             !PACKET_LOOPED(&pd)) {
6155
6156                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
6157                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
6158                 if (ipfwtag != NULL) {
6159                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
6160                             ntohs(r->divert.port);
6161                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
6162
6163                         if (s)
6164                                 PF_STATE_UNLOCK(s);
6165
6166                         m_tag_prepend(m, ipfwtag);
6167                         if (m->m_flags & M_FASTFWD_OURS) {
6168                                 if (pd.pf_mtag == NULL &&
6169                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6170                                         action = PF_DROP;
6171                                         REASON_SET(&reason, PFRES_MEMORY);
6172                                         log = 1;
6173                                         DPFPRINTF(PF_DEBUG_MISC,
6174                                             ("pf: failed to allocate tag\n"));
6175                                 } else {
6176                                         pd.pf_mtag->flags |=
6177                                             PF_FASTFWD_OURS_PRESENT;
6178                                         m->m_flags &= ~M_FASTFWD_OURS;
6179                                 }
6180                         }
6181                         ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
6182                         *m0 = NULL;
6183
6184                         return (action);
6185                 } else {
6186                         /* XXX: ipfw has the same behaviour! */
6187                         action = PF_DROP;
6188                         REASON_SET(&reason, PFRES_MEMORY);
6189                         log = 1;
6190                         DPFPRINTF(PF_DEBUG_MISC,
6191                             ("pf: failed to allocate divert tag\n"));
6192                 }
6193         }
6194
6195         if (log) {
6196                 struct pf_rule *lr;
6197
6198                 if (s != NULL && s->nat_rule.ptr != NULL &&
6199                     s->nat_rule.ptr->log & PF_LOG_ALL)
6200                         lr = s->nat_rule.ptr;
6201                 else
6202                         lr = r;
6203                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6204                     (s == NULL));
6205         }
6206
6207         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6208         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6209
6210         if (action == PF_PASS || r->action == PF_DROP) {
6211                 dirndx = (dir == PF_OUT);
6212                 r->packets[dirndx]++;
6213                 r->bytes[dirndx] += pd.tot_len;
6214                 if (a != NULL) {
6215                         a->packets[dirndx]++;
6216                         a->bytes[dirndx] += pd.tot_len;
6217                 }
6218                 if (s != NULL) {
6219                         if (s->nat_rule.ptr != NULL) {
6220                                 s->nat_rule.ptr->packets[dirndx]++;
6221                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6222                         }
6223                         if (s->src_node != NULL) {
6224                                 s->src_node->packets[dirndx]++;
6225                                 s->src_node->bytes[dirndx] += pd.tot_len;
6226                         }
6227                         if (s->nat_src_node != NULL) {
6228                                 s->nat_src_node->packets[dirndx]++;
6229                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6230                         }
6231                         dirndx = (dir == s->direction) ? 0 : 1;
6232                         s->packets[dirndx]++;
6233                         s->bytes[dirndx] += pd.tot_len;
6234                 }
6235                 tr = r;
6236                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6237                 if (nr != NULL && r == &V_pf_default_rule)
6238                         tr = nr;
6239                 if (tr->src.addr.type == PF_ADDR_TABLE)
6240                         pfr_update_stats(tr->src.addr.p.tbl,
6241                             (s == NULL) ? pd.src :
6242                             &s->key[(s->direction == PF_IN)]->
6243                                 addr[(s->direction == PF_OUT)],
6244                             pd.af, pd.tot_len, dir == PF_OUT,
6245                             r->action == PF_PASS, tr->src.neg);
6246                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6247                         pfr_update_stats(tr->dst.addr.p.tbl,
6248                             (s == NULL) ? pd.dst :
6249                             &s->key[(s->direction == PF_IN)]->
6250                                 addr[(s->direction == PF_IN)],
6251                             pd.af, pd.tot_len, dir == PF_OUT,
6252                             r->action == PF_PASS, tr->dst.neg);
6253         }
6254
6255         switch (action) {
6256         case PF_SYNPROXY_DROP:
6257                 m_freem(*m0);
6258         case PF_DEFER:
6259                 *m0 = NULL;
6260                 action = PF_PASS;
6261                 break;
6262         case PF_DROP:
6263                 m_freem(*m0);
6264                 *m0 = NULL;
6265                 break;
6266         default:
6267                 /* pf_route() returns unlocked. */
6268                 if (r->rt) {
6269                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
6270                         return (action);
6271                 }
6272                 break;
6273         }
6274         if (s)
6275                 PF_STATE_UNLOCK(s);
6276
6277         return (action);
6278 }
6279 #endif /* INET */
6280
6281 #ifdef INET6
6282 int
6283 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6284 {
6285         struct pfi_kif          *kif;
6286         u_short                  action, reason = 0, log = 0;
6287         struct mbuf             *m = *m0, *n = NULL;
6288         struct m_tag            *mtag;
6289         struct ip6_hdr          *h = NULL;
6290         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6291         struct pf_state         *s = NULL;
6292         struct pf_ruleset       *ruleset = NULL;
6293         struct pf_pdesc          pd;
6294         int                      off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
6295
6296         PF_RULES_RLOCK_TRACKER;
6297         M_ASSERTPKTHDR(m);
6298
6299         if (!V_pf_status.running)
6300                 return (PF_PASS);
6301
6302         memset(&pd, 0, sizeof(pd));
6303         pd.pf_mtag = pf_find_mtag(m);
6304
6305         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6306                 return (PF_PASS);
6307
6308         kif = (struct pfi_kif *)ifp->if_pf_kif;
6309         if (kif == NULL) {
6310                 DPFPRINTF(PF_DEBUG_URGENT,
6311                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6312                 return (PF_DROP);
6313         }
6314         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6315                 return (PF_PASS);
6316
6317         if (m->m_flags & M_SKIP_FIREWALL)
6318                 return (PF_PASS);
6319
6320         PF_RULES_RLOCK();
6321
6322         /* We do IP header normalization and packet reassembly here */
6323         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6324                 action = PF_DROP;
6325                 goto done;
6326         }
6327         m = *m0;        /* pf_normalize messes with m0 */
6328         h = mtod(m, struct ip6_hdr *);
6329
6330 #if 1
6331         /*
6332          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6333          * will do something bad, so drop the packet for now.
6334          */
6335         if (htons(h->ip6_plen) == 0) {
6336                 action = PF_DROP;
6337                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6338                 goto done;
6339         }
6340 #endif
6341
6342         pd.src = (struct pf_addr *)&h->ip6_src;
6343         pd.dst = (struct pf_addr *)&h->ip6_dst;
6344         pd.sport = pd.dport = NULL;
6345         pd.ip_sum = NULL;
6346         pd.proto_sum = NULL;
6347         pd.dir = dir;
6348         pd.sidx = (dir == PF_IN) ? 0 : 1;
6349         pd.didx = (dir == PF_IN) ? 1 : 0;
6350         pd.af = AF_INET6;
6351         pd.tos = 0;
6352         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6353
6354         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6355         pd.proto = h->ip6_nxt;
6356         do {
6357                 switch (pd.proto) {
6358                 case IPPROTO_FRAGMENT:
6359                         action = pf_test_fragment(&r, dir, kif, m, h,
6360                             &pd, &a, &ruleset);
6361                         if (action == PF_DROP)
6362                                 REASON_SET(&reason, PFRES_FRAG);
6363                         goto done;
6364                 case IPPROTO_ROUTING: {
6365                         struct ip6_rthdr rthdr;
6366
6367                         if (rh_cnt++) {
6368                                 DPFPRINTF(PF_DEBUG_MISC,
6369                                     ("pf: IPv6 more than one rthdr\n"));
6370                                 action = PF_DROP;
6371                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6372                                 log = 1;
6373                                 goto done;
6374                         }
6375                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6376                             &reason, pd.af)) {
6377                                 DPFPRINTF(PF_DEBUG_MISC,
6378                                     ("pf: IPv6 short rthdr\n"));
6379                                 action = PF_DROP;
6380                                 REASON_SET(&reason, PFRES_SHORT);
6381                                 log = 1;
6382                                 goto done;
6383                         }
6384                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6385                                 DPFPRINTF(PF_DEBUG_MISC,
6386                                     ("pf: IPv6 rthdr0\n"));
6387                                 action = PF_DROP;
6388                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6389                                 log = 1;
6390                                 goto done;
6391                         }
6392                         /* FALLTHROUGH */
6393                 }
6394                 case IPPROTO_AH:
6395                 case IPPROTO_HOPOPTS:
6396                 case IPPROTO_DSTOPTS: {
6397                         /* get next header and header length */
6398                         struct ip6_ext  opt6;
6399
6400                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6401                             NULL, &reason, pd.af)) {
6402                                 DPFPRINTF(PF_DEBUG_MISC,
6403                                     ("pf: IPv6 short opt\n"));
6404                                 action = PF_DROP;
6405                                 log = 1;
6406                                 goto done;
6407                         }
6408                         if (pd.proto == IPPROTO_AH)
6409                                 off += (opt6.ip6e_len + 2) * 4;
6410                         else
6411                                 off += (opt6.ip6e_len + 1) * 8;
6412                         pd.proto = opt6.ip6e_nxt;
6413                         /* goto the next header */
6414                         break;
6415                 }
6416                 default:
6417                         terminal++;
6418                         break;
6419                 }
6420         } while (!terminal);
6421
6422         /* if there's no routing header, use unmodified mbuf for checksumming */
6423         if (!n)
6424                 n = m;
6425
6426         switch (pd.proto) {
6427
6428         case IPPROTO_TCP: {
6429                 struct tcphdr   th;
6430
6431                 pd.hdr.tcp = &th;
6432                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6433                     &action, &reason, AF_INET6)) {
6434                         log = action != PF_PASS;
6435                         goto done;
6436                 }
6437                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6438                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6439                 if (action == PF_DROP)
6440                         goto done;
6441                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6442                     &reason);
6443                 if (action == PF_PASS) {
6444                         if (V_pfsync_update_state_ptr != NULL)
6445                                 V_pfsync_update_state_ptr(s);
6446                         r = s->rule.ptr;
6447                         a = s->anchor.ptr;
6448                         log = s->log;
6449                 } else if (s == NULL)
6450                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6451                             &a, &ruleset, inp);
6452                 break;
6453         }
6454
6455         case IPPROTO_UDP: {
6456                 struct udphdr   uh;
6457
6458                 pd.hdr.udp = &uh;
6459                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6460                     &action, &reason, AF_INET6)) {
6461                         log = action != PF_PASS;
6462                         goto done;
6463                 }
6464                 if (uh.uh_dport == 0 ||
6465                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6466                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6467                         action = PF_DROP;
6468                         REASON_SET(&reason, PFRES_SHORT);
6469                         goto done;
6470                 }
6471                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6472                 if (action == PF_PASS) {
6473                         if (V_pfsync_update_state_ptr != NULL)
6474                                 V_pfsync_update_state_ptr(s);
6475                         r = s->rule.ptr;
6476                         a = s->anchor.ptr;
6477                         log = s->log;
6478                 } else if (s == NULL)
6479                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6480                             &a, &ruleset, inp);
6481                 break;
6482         }
6483
6484         case IPPROTO_ICMP: {
6485                 action = PF_DROP;
6486                 DPFPRINTF(PF_DEBUG_MISC,
6487                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6488                 goto done;
6489         }
6490
6491         case IPPROTO_ICMPV6: {
6492                 struct icmp6_hdr        ih;
6493
6494                 pd.hdr.icmp6 = &ih;
6495                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6496                     &action, &reason, AF_INET6)) {
6497                         log = action != PF_PASS;
6498                         goto done;
6499                 }
6500                 action = pf_test_state_icmp(&s, dir, kif,
6501                     m, off, h, &pd, &reason);
6502                 if (action == PF_PASS) {
6503                         if (V_pfsync_update_state_ptr != NULL)
6504                                 V_pfsync_update_state_ptr(s);
6505                         r = s->rule.ptr;
6506                         a = s->anchor.ptr;
6507                         log = s->log;
6508                 } else if (s == NULL)
6509                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6510                             &a, &ruleset, inp);
6511                 break;
6512         }
6513
6514         default:
6515                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6516                 if (action == PF_PASS) {
6517                         if (V_pfsync_update_state_ptr != NULL)
6518                                 V_pfsync_update_state_ptr(s);
6519                         r = s->rule.ptr;
6520                         a = s->anchor.ptr;
6521                         log = s->log;
6522                 } else if (s == NULL)
6523                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6524                             &a, &ruleset, inp);
6525                 break;
6526         }
6527
6528 done:
6529         PF_RULES_RUNLOCK();
6530         if (n != m) {
6531                 m_freem(n);
6532                 n = NULL;
6533         }
6534
6535         /* handle dangerous IPv6 extension headers. */
6536         if (action == PF_PASS && rh_cnt &&
6537             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6538                 action = PF_DROP;
6539                 REASON_SET(&reason, PFRES_IPOPTIONS);
6540                 log = r->log;
6541                 DPFPRINTF(PF_DEBUG_MISC,
6542                     ("pf: dropping packet with dangerous v6 headers\n"));
6543         }
6544
6545         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6546                 action = PF_DROP;
6547                 REASON_SET(&reason, PFRES_MEMORY);
6548         }
6549         if (r->rtableid >= 0)
6550                 M_SETFIB(m, r->rtableid);
6551
6552         if (r->scrub_flags & PFSTATE_SETPRIO) {
6553                 if (pd.tos & IPTOS_LOWDELAY)
6554                         pqid = 1;
6555                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6556                         action = PF_DROP;
6557                         REASON_SET(&reason, PFRES_MEMORY);
6558                         log = 1;
6559                         DPFPRINTF(PF_DEBUG_MISC,
6560                             ("pf: failed to allocate 802.1q mtag\n"));
6561                 }
6562         }
6563
6564 #ifdef ALTQ
6565         if (action == PF_PASS && r->qid) {
6566                 if (pd.pf_mtag == NULL &&
6567                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6568                         action = PF_DROP;
6569                         REASON_SET(&reason, PFRES_MEMORY);
6570                 } else {
6571                         if (s != NULL)
6572                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6573                         if (pd.tos & IPTOS_LOWDELAY)
6574                                 pd.pf_mtag->qid = r->pqid;
6575                         else
6576                                 pd.pf_mtag->qid = r->qid;
6577                         /* Add hints for ecn. */
6578                         pd.pf_mtag->hdr = h;
6579                 }
6580         }
6581 #endif /* ALTQ */
6582
6583         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6584             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6585             (s->nat_rule.ptr->action == PF_RDR ||
6586             s->nat_rule.ptr->action == PF_BINAT) &&
6587             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6588                 m->m_flags |= M_SKIP_FIREWALL;
6589
6590         /* XXX: Anybody working on it?! */
6591         if (r->divert.port)
6592                 printf("pf: divert(9) is not supported for IPv6\n");
6593
6594         if (log) {
6595                 struct pf_rule *lr;
6596
6597                 if (s != NULL && s->nat_rule.ptr != NULL &&
6598                     s->nat_rule.ptr->log & PF_LOG_ALL)
6599                         lr = s->nat_rule.ptr;
6600                 else
6601                         lr = r;
6602                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6603                     &pd, (s == NULL));
6604         }
6605
6606         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6607         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6608
6609         if (action == PF_PASS || r->action == PF_DROP) {
6610                 dirndx = (dir == PF_OUT);
6611                 r->packets[dirndx]++;
6612                 r->bytes[dirndx] += pd.tot_len;
6613                 if (a != NULL) {
6614                         a->packets[dirndx]++;
6615                         a->bytes[dirndx] += pd.tot_len;
6616                 }
6617                 if (s != NULL) {
6618                         if (s->nat_rule.ptr != NULL) {
6619                                 s->nat_rule.ptr->packets[dirndx]++;
6620                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6621                         }
6622                         if (s->src_node != NULL) {
6623                                 s->src_node->packets[dirndx]++;
6624                                 s->src_node->bytes[dirndx] += pd.tot_len;
6625                         }
6626                         if (s->nat_src_node != NULL) {
6627                                 s->nat_src_node->packets[dirndx]++;
6628                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6629                         }
6630                         dirndx = (dir == s->direction) ? 0 : 1;
6631                         s->packets[dirndx]++;
6632                         s->bytes[dirndx] += pd.tot_len;
6633                 }
6634                 tr = r;
6635                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6636                 if (nr != NULL && r == &V_pf_default_rule)
6637                         tr = nr;
6638                 if (tr->src.addr.type == PF_ADDR_TABLE)
6639                         pfr_update_stats(tr->src.addr.p.tbl,
6640                             (s == NULL) ? pd.src :
6641                             &s->key[(s->direction == PF_IN)]->addr[0],
6642                             pd.af, pd.tot_len, dir == PF_OUT,
6643                             r->action == PF_PASS, tr->src.neg);
6644                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6645                         pfr_update_stats(tr->dst.addr.p.tbl,
6646                             (s == NULL) ? pd.dst :
6647                             &s->key[(s->direction == PF_IN)]->addr[1],
6648                             pd.af, pd.tot_len, dir == PF_OUT,
6649                             r->action == PF_PASS, tr->dst.neg);
6650         }
6651
6652         switch (action) {
6653         case PF_SYNPROXY_DROP:
6654                 m_freem(*m0);
6655         case PF_DEFER:
6656                 *m0 = NULL;
6657                 action = PF_PASS;
6658                 break;
6659         case PF_DROP:
6660                 m_freem(*m0);
6661                 *m0 = NULL;
6662                 break;
6663         default:
6664                 /* pf_route6() returns unlocked. */
6665                 if (r->rt) {
6666                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd, inp);
6667                         return (action);
6668                 }
6669                 break;
6670         }
6671
6672         if (s)
6673                 PF_STATE_UNLOCK(s);
6674
6675         /* If reassembled packet passed, create new fragments. */
6676         if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) &&
6677             (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
6678                 action = pf_refragment6(ifp, m0, mtag);
6679
6680         return (action);
6681 }
6682 #endif /* INET6 */