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 static VNET_DEFINE(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 static VNET_DEFINE(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 static VNET_DEFINE(struct pf_overload_head, pf_overloadqueue);
 183 #define V_pf_overloadqueue      VNET(pf_overloadqueue)
 184 static VNET_DEFINE(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 static VNET_DEFINE(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 *);
 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 *);
 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 (pfsync_insert_state_ptr != NULL)
1272                 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                         return (state->expire + timeout * (end - states) /
1572                             (end - start));
1573                 else
1574                         return (time_uptime);
1575         }
1576         return (state->expire + timeout);
1577 }
1578
1579 void
1580 pf_purge_expired_src_nodes()
1581 {
1582         struct pf_src_node_list  freelist;
1583         struct pf_srchash       *sh;
1584         struct pf_src_node      *cur, *next;
1585         int i;
1586
1587         LIST_INIT(&freelist);
1588         for (i = 0, sh = V_pf_srchash; i <= pf_srchashmask; i++, sh++) {
1589             PF_HASHROW_LOCK(sh);
1590             LIST_FOREACH_SAFE(cur, &sh->nodes, entry, next)
1591                 if (cur->states == 0 && cur->expire <= time_uptime) {
1592                         pf_unlink_src_node(cur);
1593                         LIST_INSERT_HEAD(&freelist, cur, entry);
1594                 } else if (cur->rule.ptr != NULL)
1595                         cur->rule.ptr->rule_flag |= PFRULE_REFS;
1596             PF_HASHROW_UNLOCK(sh);
1597         }
1598
1599         pf_free_src_nodes(&freelist);
1600
1601         V_pf_status.src_nodes = uma_zone_get_cur(V_pf_sources_z);
1602 }
1603
1604 static void
1605 pf_src_tree_remove_state(struct pf_state *s)
1606 {
1607         struct pf_src_node *sn;
1608         struct pf_srchash *sh;
1609         uint32_t timeout;
1610
1611         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE] ?
1612             s->rule.ptr->timeout[PFTM_SRC_NODE] :
1613             V_pf_default_rule.timeout[PFTM_SRC_NODE];
1614
1615         if (s->src_node != NULL) {
1616                 sn = s->src_node;
1617                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1618                 PF_HASHROW_LOCK(sh);
1619                 if (s->src.tcp_est)
1620                         --sn->conn;
1621                 if (--sn->states == 0)
1622                         sn->expire = time_uptime + timeout;
1623                 PF_HASHROW_UNLOCK(sh);
1624         }
1625         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
1626                 sn = s->nat_src_node;
1627                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
1628                 PF_HASHROW_LOCK(sh);
1629                 if (--sn->states == 0)
1630                         sn->expire = time_uptime + timeout;
1631                 PF_HASHROW_UNLOCK(sh);
1632         }
1633         s->src_node = s->nat_src_node = NULL;
1634 }
1635
1636 /*
1637  * Unlink and potentilly free a state. Function may be
1638  * called with ID hash row locked, but always returns
1639  * unlocked, since it needs to go through key hash locking.
1640  */
1641 int
1642 pf_unlink_state(struct pf_state *s, u_int flags)
1643 {
1644         struct pf_idhash *ih = &V_pf_idhash[PF_IDHASH(s)];
1645
1646         if ((flags & PF_ENTER_LOCKED) == 0)
1647                 PF_HASHROW_LOCK(ih);
1648         else
1649                 PF_HASHROW_ASSERT(ih);
1650
1651         if (s->timeout == PFTM_UNLINKED) {
1652                 /*
1653                  * State is being processed
1654                  * by pf_unlink_state() in
1655                  * an other thread.
1656                  */
1657                 PF_HASHROW_UNLOCK(ih);
1658                 return (0);     /* XXXGL: undefined actually */
1659         }
1660
1661         if (s->src.state == PF_TCPS_PROXY_DST) {
1662                 /* XXX wire key the right one? */
1663                 pf_send_tcp(NULL, s->rule.ptr, s->key[PF_SK_WIRE]->af,
1664                     &s->key[PF_SK_WIRE]->addr[1],
1665                     &s->key[PF_SK_WIRE]->addr[0],
1666                     s->key[PF_SK_WIRE]->port[1],
1667                     s->key[PF_SK_WIRE]->port[0],
1668                     s->src.seqhi, s->src.seqlo + 1,
1669                     TH_RST|TH_ACK, 0, 0, 0, 1, s->tag, NULL);
1670         }
1671
1672         LIST_REMOVE(s, entry);
1673         pf_src_tree_remove_state(s);
1674
1675         if (pfsync_delete_state_ptr != NULL)
1676                 pfsync_delete_state_ptr(s);
1677
1678         STATE_DEC_COUNTERS(s);
1679
1680         s->timeout = PFTM_UNLINKED;
1681
1682         PF_HASHROW_UNLOCK(ih);
1683
1684         pf_detach_state(s);
1685         /* pf_state_insert() initialises refs to 2, so we can never release the
1686          * last reference here, only in pf_release_state(). */
1687         (void)refcount_release(&s->refs);
1688
1689         return (pf_release_state(s));
1690 }
1691
1692 void
1693 pf_free_state(struct pf_state *cur)
1694 {
1695
1696         KASSERT(cur->refs == 0, ("%s: %p has refs", __func__, cur));
1697         KASSERT(cur->timeout == PFTM_UNLINKED, ("%s: timeout %u", __func__,
1698             cur->timeout));
1699
1700         pf_normalize_tcp_cleanup(cur);
1701         uma_zfree(V_pf_state_z, cur);
1702         counter_u64_add(V_pf_status.fcounters[FCNT_STATE_REMOVALS], 1);
1703 }
1704
1705 /*
1706  * Called only from pf_purge_thread(), thus serialized.
1707  */
1708 static u_int
1709 pf_purge_expired_states(u_int i, int maxcheck)
1710 {
1711         struct pf_idhash *ih;
1712         struct pf_state *s;
1713
1714         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1715
1716         /*
1717          * Go through hash and unlink states that expire now.
1718          */
1719         while (maxcheck > 0) {
1720
1721                 ih = &V_pf_idhash[i];
1722 relock:
1723                 PF_HASHROW_LOCK(ih);
1724                 LIST_FOREACH(s, &ih->states, entry) {
1725                         if (pf_state_expires(s) <= time_uptime) {
1726                                 V_pf_status.states -=
1727                                     pf_unlink_state(s, PF_ENTER_LOCKED);
1728                                 goto relock;
1729                         }
1730                         s->rule.ptr->rule_flag |= PFRULE_REFS;
1731                         if (s->nat_rule.ptr != NULL)
1732                                 s->nat_rule.ptr->rule_flag |= PFRULE_REFS;
1733                         if (s->anchor.ptr != NULL)
1734                                 s->anchor.ptr->rule_flag |= PFRULE_REFS;
1735                         s->kif->pfik_flags |= PFI_IFLAG_REFS;
1736                         if (s->rt_kif)
1737                                 s->rt_kif->pfik_flags |= PFI_IFLAG_REFS;
1738                 }
1739                 PF_HASHROW_UNLOCK(ih);
1740
1741                 /* Return when we hit end of hash. */
1742                 if (++i > pf_hashmask) {
1743                         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1744                         return (0);
1745                 }
1746
1747                 maxcheck--;
1748         }
1749
1750         V_pf_status.states = uma_zone_get_cur(V_pf_state_z);
1751
1752         return (i);
1753 }
1754
1755 static void
1756 pf_purge_unlinked_rules()
1757 {
1758         struct pf_rulequeue tmpq;
1759         struct pf_rule *r, *r1;
1760
1761         /*
1762          * If we have overloading task pending, then we'd
1763          * better skip purging this time. There is a tiny
1764          * probability that overloading task references
1765          * an already unlinked rule.
1766          */
1767         PF_OVERLOADQ_LOCK();
1768         if (!SLIST_EMPTY(&V_pf_overloadqueue)) {
1769                 PF_OVERLOADQ_UNLOCK();
1770                 return;
1771         }
1772         PF_OVERLOADQ_UNLOCK();
1773
1774         /*
1775          * Do naive mark-and-sweep garbage collecting of old rules.
1776          * Reference flag is raised by pf_purge_expired_states()
1777          * and pf_purge_expired_src_nodes().
1778          *
1779          * To avoid LOR between PF_UNLNKDRULES_LOCK/PF_RULES_WLOCK,
1780          * use a temporary queue.
1781          */
1782         TAILQ_INIT(&tmpq);
1783         PF_UNLNKDRULES_LOCK();
1784         TAILQ_FOREACH_SAFE(r, &V_pf_unlinked_rules, entries, r1) {
1785                 if (!(r->rule_flag & PFRULE_REFS)) {
1786                         TAILQ_REMOVE(&V_pf_unlinked_rules, r, entries);
1787                         TAILQ_INSERT_TAIL(&tmpq, r, entries);
1788                 } else
1789                         r->rule_flag &= ~PFRULE_REFS;
1790         }
1791         PF_UNLNKDRULES_UNLOCK();
1792
1793         if (!TAILQ_EMPTY(&tmpq)) {
1794                 PF_RULES_WLOCK();
1795                 TAILQ_FOREACH_SAFE(r, &tmpq, entries, r1) {
1796                         TAILQ_REMOVE(&tmpq, r, entries);
1797                         pf_free_rule(r);
1798                 }
1799                 PF_RULES_WUNLOCK();
1800         }
1801 }
1802
1803 void
1804 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
1805 {
1806         switch (af) {
1807 #ifdef INET
1808         case AF_INET: {
1809                 u_int32_t a = ntohl(addr->addr32[0]);
1810                 printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
1811                     (a>>8)&255, a&255);
1812                 if (p) {
1813                         p = ntohs(p);
1814                         printf(":%u", p);
1815                 }
1816                 break;
1817         }
1818 #endif /* INET */
1819 #ifdef INET6
1820         case AF_INET6: {
1821                 u_int16_t b;
1822                 u_int8_t i, curstart, curend, maxstart, maxend;
1823                 curstart = curend = maxstart = maxend = 255;
1824                 for (i = 0; i < 8; i++) {
1825                         if (!addr->addr16[i]) {
1826                                 if (curstart == 255)
1827                                         curstart = i;
1828                                 curend = i;
1829                         } else {
1830                                 if ((curend - curstart) >
1831                                     (maxend - maxstart)) {
1832                                         maxstart = curstart;
1833                                         maxend = curend;
1834                                 }
1835                                 curstart = curend = 255;
1836                         }
1837                 }
1838                 if ((curend - curstart) >
1839                     (maxend - maxstart)) {
1840                         maxstart = curstart;
1841                         maxend = curend;
1842                 }
1843                 for (i = 0; i < 8; i++) {
1844                         if (i >= maxstart && i <= maxend) {
1845                                 if (i == 0)
1846                                         printf(":");
1847                                 if (i == maxend)
1848                                         printf(":");
1849                         } else {
1850                                 b = ntohs(addr->addr16[i]);
1851                                 printf("%x", b);
1852                                 if (i < 7)
1853                                         printf(":");
1854                         }
1855                 }
1856                 if (p) {
1857                         p = ntohs(p);
1858                         printf("[%u]", p);
1859                 }
1860                 break;
1861         }
1862 #endif /* INET6 */
1863         }
1864 }
1865
1866 void
1867 pf_print_state(struct pf_state *s)
1868 {
1869         pf_print_state_parts(s, NULL, NULL);
1870 }
1871
1872 static void
1873 pf_print_state_parts(struct pf_state *s,
1874     struct pf_state_key *skwp, struct pf_state_key *sksp)
1875 {
1876         struct pf_state_key *skw, *sks;
1877         u_int8_t proto, dir;
1878
1879         /* Do our best to fill these, but they're skipped if NULL */
1880         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
1881         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
1882         proto = skw ? skw->proto : (sks ? sks->proto : 0);
1883         dir = s ? s->direction : 0;
1884
1885         switch (proto) {
1886         case IPPROTO_IPV4:
1887                 printf("IPv4");
1888                 break;
1889         case IPPROTO_IPV6:
1890                 printf("IPv6");
1891                 break;
1892         case IPPROTO_TCP:
1893                 printf("TCP");
1894                 break;
1895         case IPPROTO_UDP:
1896                 printf("UDP");
1897                 break;
1898         case IPPROTO_ICMP:
1899                 printf("ICMP");
1900                 break;
1901         case IPPROTO_ICMPV6:
1902                 printf("ICMPv6");
1903                 break;
1904         default:
1905                 printf("%u", proto);
1906                 break;
1907         }
1908         switch (dir) {
1909         case PF_IN:
1910                 printf(" in");
1911                 break;
1912         case PF_OUT:
1913                 printf(" out");
1914                 break;
1915         }
1916         if (skw) {
1917                 printf(" wire: ");
1918                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
1919                 printf(" ");
1920                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
1921         }
1922         if (sks) {
1923                 printf(" stack: ");
1924                 if (sks != skw) {
1925                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
1926                         printf(" ");
1927                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
1928                 } else
1929                         printf("-");
1930         }
1931         if (s) {
1932                 if (proto == IPPROTO_TCP) {
1933                         printf(" [lo=%u high=%u win=%u modulator=%u",
1934                             s->src.seqlo, s->src.seqhi,
1935                             s->src.max_win, s->src.seqdiff);
1936                         if (s->src.wscale && s->dst.wscale)
1937                                 printf(" wscale=%u",
1938                                     s->src.wscale & PF_WSCALE_MASK);
1939                         printf("]");
1940                         printf(" [lo=%u high=%u win=%u modulator=%u",
1941                             s->dst.seqlo, s->dst.seqhi,
1942                             s->dst.max_win, s->dst.seqdiff);
1943                         if (s->src.wscale && s->dst.wscale)
1944                                 printf(" wscale=%u",
1945                                 s->dst.wscale & PF_WSCALE_MASK);
1946                         printf("]");
1947                 }
1948                 printf(" %u:%u", s->src.state, s->dst.state);
1949         }
1950 }
1951
1952 void
1953 pf_print_flags(u_int8_t f)
1954 {
1955         if (f)
1956                 printf(" ");
1957         if (f & TH_FIN)
1958                 printf("F");
1959         if (f & TH_SYN)
1960                 printf("S");
1961         if (f & TH_RST)
1962                 printf("R");
1963         if (f & TH_PUSH)
1964                 printf("P");
1965         if (f & TH_ACK)
1966                 printf("A");
1967         if (f & TH_URG)
1968                 printf("U");
1969         if (f & TH_ECE)
1970                 printf("E");
1971         if (f & TH_CWR)
1972                 printf("W");
1973 }
1974
1975 #define PF_SET_SKIP_STEPS(i)                                    \
1976         do {                                                    \
1977                 while (head[i] != cur) {                        \
1978                         head[i]->skip[i].ptr = cur;             \
1979                         head[i] = TAILQ_NEXT(head[i], entries); \
1980                 }                                               \
1981         } while (0)
1982
1983 void
1984 pf_calc_skip_steps(struct pf_rulequeue *rules)
1985 {
1986         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
1987         int i;
1988
1989         cur = TAILQ_FIRST(rules);
1990         prev = cur;
1991         for (i = 0; i < PF_SKIP_COUNT; ++i)
1992                 head[i] = cur;
1993         while (cur != NULL) {
1994
1995                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
1996                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
1997                 if (cur->direction != prev->direction)
1998                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
1999                 if (cur->af != prev->af)
2000                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
2001                 if (cur->proto != prev->proto)
2002                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
2003                 if (cur->src.neg != prev->src.neg ||
2004                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
2005                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
2006                 if (cur->src.port[0] != prev->src.port[0] ||
2007                     cur->src.port[1] != prev->src.port[1] ||
2008                     cur->src.port_op != prev->src.port_op)
2009                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
2010                 if (cur->dst.neg != prev->dst.neg ||
2011                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
2012                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
2013                 if (cur->dst.port[0] != prev->dst.port[0] ||
2014                     cur->dst.port[1] != prev->dst.port[1] ||
2015                     cur->dst.port_op != prev->dst.port_op)
2016                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
2017
2018                 prev = cur;
2019                 cur = TAILQ_NEXT(cur, entries);
2020         }
2021         for (i = 0; i < PF_SKIP_COUNT; ++i)
2022                 PF_SET_SKIP_STEPS(i);
2023 }
2024
2025 static int
2026 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
2027 {
2028         if (aw1->type != aw2->type)
2029                 return (1);
2030         switch (aw1->type) {
2031         case PF_ADDR_ADDRMASK:
2032         case PF_ADDR_RANGE:
2033                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, AF_INET6))
2034                         return (1);
2035                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, AF_INET6))
2036                         return (1);
2037                 return (0);
2038         case PF_ADDR_DYNIFTL:
2039                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
2040         case PF_ADDR_NOROUTE:
2041         case PF_ADDR_URPFFAILED:
2042                 return (0);
2043         case PF_ADDR_TABLE:
2044                 return (aw1->p.tbl != aw2->p.tbl);
2045         default:
2046                 printf("invalid address type: %d\n", aw1->type);
2047                 return (1);
2048         }
2049 }
2050
2051 /**
2052  * Checksum updates are a little complicated because the checksum in the TCP/UDP
2053  * header isn't always a full checksum. In some cases (i.e. output) it's a
2054  * pseudo-header checksum, which is a partial checksum over src/dst IP
2055  * addresses, protocol number and length.
2056  *
2057  * That means we have the following cases:
2058  *  * Input or forwarding: we don't have TSO, the checksum fields are full
2059  *      checksums, we need to update the checksum whenever we change anything.
2060  *  * Output (i.e. the checksum is a pseudo-header checksum):
2061  *      x The field being updated is src/dst address or affects the length of
2062  *      the packet. We need to update the pseudo-header checksum (note that this
2063  *      checksum is not ones' complement).
2064  *      x Some other field is being modified (e.g. src/dst port numbers): We
2065  *      don't have to update anything.
2066  **/
2067 u_int16_t
2068 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
2069 {
2070         u_int32_t       l;
2071
2072         if (udp && !cksum)
2073                 return (0x0000);
2074         l = cksum + old - new;
2075         l = (l >> 16) + (l & 65535);
2076         l = l & 65535;
2077         if (udp && !l)
2078                 return (0xFFFF);
2079         return (l);
2080 }
2081
2082 u_int16_t
2083 pf_proto_cksum_fixup(struct mbuf *m, u_int16_t cksum, u_int16_t old,
2084         u_int16_t new, u_int8_t udp)
2085 {
2086         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2087                 return (cksum);
2088
2089         return (pf_cksum_fixup(cksum, old, new, udp));
2090 }
2091
2092 static void
2093 pf_change_ap(struct mbuf *m, struct pf_addr *a, u_int16_t *p, u_int16_t *ic,
2094         u_int16_t *pc, struct pf_addr *an, u_int16_t pn, u_int8_t u,
2095         sa_family_t af)
2096 {
2097         struct pf_addr  ao;
2098         u_int16_t       po = *p;
2099
2100         PF_ACPY(&ao, a, af);
2101         PF_ACPY(a, an, af);
2102
2103         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA | CSUM_DELAY_DATA_IPV6))
2104                 *pc = ~*pc;
2105
2106         *p = pn;
2107
2108         switch (af) {
2109 #ifdef INET
2110         case AF_INET:
2111                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2112                     ao.addr16[0], an->addr16[0], 0),
2113                     ao.addr16[1], an->addr16[1], 0);
2114                 *p = pn;
2115
2116                 *pc = pf_cksum_fixup(pf_cksum_fixup(*pc,
2117                     ao.addr16[0], an->addr16[0], u),
2118                     ao.addr16[1], an->addr16[1], u);
2119
2120                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2121                 break;
2122 #endif /* INET */
2123 #ifdef INET6
2124         case AF_INET6:
2125                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2126                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2127                     pf_cksum_fixup(pf_cksum_fixup(*pc,
2128                     ao.addr16[0], an->addr16[0], u),
2129                     ao.addr16[1], an->addr16[1], u),
2130                     ao.addr16[2], an->addr16[2], u),
2131                     ao.addr16[3], an->addr16[3], u),
2132                     ao.addr16[4], an->addr16[4], u),
2133                     ao.addr16[5], an->addr16[5], u),
2134                     ao.addr16[6], an->addr16[6], u),
2135                     ao.addr16[7], an->addr16[7], u);
2136
2137                 *pc = pf_proto_cksum_fixup(m, *pc, po, pn, u);
2138                 break;
2139 #endif /* INET6 */
2140         }
2141
2142         if (m->m_pkthdr.csum_flags & (CSUM_DELAY_DATA |
2143             CSUM_DELAY_DATA_IPV6)) {
2144                 *pc = ~*pc;
2145                 if (! *pc)
2146                         *pc = 0xffff;
2147         }
2148 }
2149
2150 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
2151 void
2152 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
2153 {
2154         u_int32_t       ao;
2155
2156         memcpy(&ao, a, sizeof(ao));
2157         memcpy(a, &an, sizeof(u_int32_t));
2158         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
2159             ao % 65536, an % 65536, u);
2160 }
2161
2162 void
2163 pf_change_proto_a(struct mbuf *m, void *a, u_int16_t *c, u_int32_t an, u_int8_t udp)
2164 {
2165         u_int32_t       ao;
2166
2167         memcpy(&ao, a, sizeof(ao));
2168         memcpy(a, &an, sizeof(u_int32_t));
2169
2170         *c = pf_proto_cksum_fixup(m,
2171             pf_proto_cksum_fixup(m, *c, ao / 65536, an / 65536, udp),
2172             ao % 65536, an % 65536, udp);
2173 }
2174
2175 #ifdef INET6
2176 static void
2177 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
2178 {
2179         struct pf_addr  ao;
2180
2181         PF_ACPY(&ao, a, AF_INET6);
2182         PF_ACPY(a, an, AF_INET6);
2183
2184         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2185             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2186             pf_cksum_fixup(pf_cksum_fixup(*c,
2187             ao.addr16[0], an->addr16[0], u),
2188             ao.addr16[1], an->addr16[1], u),
2189             ao.addr16[2], an->addr16[2], u),
2190             ao.addr16[3], an->addr16[3], u),
2191             ao.addr16[4], an->addr16[4], u),
2192             ao.addr16[5], an->addr16[5], u),
2193             ao.addr16[6], an->addr16[6], u),
2194             ao.addr16[7], an->addr16[7], u);
2195 }
2196 #endif /* INET6 */
2197
2198 static void
2199 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
2200     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
2201     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
2202 {
2203         struct pf_addr  oia, ooa;
2204
2205         PF_ACPY(&oia, ia, af);
2206         if (oa)
2207                 PF_ACPY(&ooa, oa, af);
2208
2209         /* Change inner protocol port, fix inner protocol checksum. */
2210         if (ip != NULL) {
2211                 u_int16_t       oip = *ip;
2212                 u_int32_t       opc;
2213
2214                 if (pc != NULL)
2215                         opc = *pc;
2216                 *ip = np;
2217                 if (pc != NULL)
2218                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
2219                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
2220                 if (pc != NULL)
2221                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
2222         }
2223         /* Change inner ip address, fix inner ip and icmp checksums. */
2224         PF_ACPY(ia, na, af);
2225         switch (af) {
2226 #ifdef INET
2227         case AF_INET: {
2228                 u_int32_t        oh2c = *h2c;
2229
2230                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
2231                     oia.addr16[0], ia->addr16[0], 0),
2232                     oia.addr16[1], ia->addr16[1], 0);
2233                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
2234                     oia.addr16[0], ia->addr16[0], 0),
2235                     oia.addr16[1], ia->addr16[1], 0);
2236                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
2237                 break;
2238         }
2239 #endif /* INET */
2240 #ifdef INET6
2241         case AF_INET6:
2242                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2243                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2244                     pf_cksum_fixup(pf_cksum_fixup(*ic,
2245                     oia.addr16[0], ia->addr16[0], u),
2246                     oia.addr16[1], ia->addr16[1], u),
2247                     oia.addr16[2], ia->addr16[2], u),
2248                     oia.addr16[3], ia->addr16[3], u),
2249                     oia.addr16[4], ia->addr16[4], u),
2250                     oia.addr16[5], ia->addr16[5], u),
2251                     oia.addr16[6], ia->addr16[6], u),
2252                     oia.addr16[7], ia->addr16[7], u);
2253                 break;
2254 #endif /* INET6 */
2255         }
2256         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
2257         if (oa) {
2258                 PF_ACPY(oa, na, af);
2259                 switch (af) {
2260 #ifdef INET
2261                 case AF_INET:
2262                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
2263                             ooa.addr16[0], oa->addr16[0], 0),
2264                             ooa.addr16[1], oa->addr16[1], 0);
2265                         break;
2266 #endif /* INET */
2267 #ifdef INET6
2268                 case AF_INET6:
2269                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2270                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
2271                             pf_cksum_fixup(pf_cksum_fixup(*ic,
2272                             ooa.addr16[0], oa->addr16[0], u),
2273                             ooa.addr16[1], oa->addr16[1], u),
2274                             ooa.addr16[2], oa->addr16[2], u),
2275                             ooa.addr16[3], oa->addr16[3], u),
2276                             ooa.addr16[4], oa->addr16[4], u),
2277                             ooa.addr16[5], oa->addr16[5], u),
2278                             ooa.addr16[6], oa->addr16[6], u),
2279                             ooa.addr16[7], oa->addr16[7], u);
2280                         break;
2281 #endif /* INET6 */
2282                 }
2283         }
2284 }
2285
2286
2287 /*
2288  * Need to modulate the sequence numbers in the TCP SACK option
2289  * (credits to Krzysztof Pfaff for report and patch)
2290  */
2291 static int
2292 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
2293     struct tcphdr *th, struct pf_state_peer *dst)
2294 {
2295         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
2296         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
2297         int copyback = 0, i, olen;
2298         struct sackblk sack;
2299
2300 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
2301         if (hlen < TCPOLEN_SACKLEN ||
2302             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
2303                 return 0;
2304
2305         while (hlen >= TCPOLEN_SACKLEN) {
2306                 olen = opt[1];
2307                 switch (*opt) {
2308                 case TCPOPT_EOL:        /* FALLTHROUGH */
2309                 case TCPOPT_NOP:
2310                         opt++;
2311                         hlen--;
2312                         break;
2313                 case TCPOPT_SACK:
2314                         if (olen > hlen)
2315                                 olen = hlen;
2316                         if (olen >= TCPOLEN_SACKLEN) {
2317                                 for (i = 2; i + TCPOLEN_SACK <= olen;
2318                                     i += TCPOLEN_SACK) {
2319                                         memcpy(&sack, &opt[i], sizeof(sack));
2320                                         pf_change_proto_a(m, &sack.start, &th->th_sum,
2321                                             htonl(ntohl(sack.start) - dst->seqdiff), 0);
2322                                         pf_change_proto_a(m, &sack.end, &th->th_sum,
2323                                             htonl(ntohl(sack.end) - dst->seqdiff), 0);
2324                                         memcpy(&opt[i], &sack, sizeof(sack));
2325                                 }
2326                                 copyback = 1;
2327                         }
2328                         /* FALLTHROUGH */
2329                 default:
2330                         if (olen < 2)
2331                                 olen = 2;
2332                         hlen -= olen;
2333                         opt += olen;
2334                 }
2335         }
2336
2337         if (copyback)
2338                 m_copyback(m, off + sizeof(*th), thoptlen, (caddr_t)opts);
2339         return (copyback);
2340 }
2341
2342 static void
2343 pf_send_tcp(struct mbuf *replyto, const struct pf_rule *r, sa_family_t af,
2344     const struct pf_addr *saddr, const struct pf_addr *daddr,
2345     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
2346     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
2347     u_int16_t rtag, struct ifnet *ifp)
2348 {
2349         struct pf_send_entry *pfse;
2350         struct mbuf     *m;
2351         int              len, tlen;
2352 #ifdef INET
2353         struct ip       *h = NULL;
2354 #endif /* INET */
2355 #ifdef INET6
2356         struct ip6_hdr  *h6 = NULL;
2357 #endif /* INET6 */
2358         struct tcphdr   *th;
2359         char            *opt;
2360         struct pf_mtag  *pf_mtag;
2361
2362         len = 0;
2363         th = NULL;
2364
2365         /* maximum segment size tcp option */
2366         tlen = sizeof(struct tcphdr);
2367         if (mss)
2368                 tlen += 4;
2369
2370         switch (af) {
2371 #ifdef INET
2372         case AF_INET:
2373                 len = sizeof(struct ip) + tlen;
2374                 break;
2375 #endif /* INET */
2376 #ifdef INET6
2377         case AF_INET6:
2378                 len = sizeof(struct ip6_hdr) + tlen;
2379                 break;
2380 #endif /* INET6 */
2381         default:
2382                 panic("%s: unsupported af %d", __func__, af);
2383         }
2384
2385         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2386         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2387         if (pfse == NULL)
2388                 return;
2389         m = m_gethdr(M_NOWAIT, MT_DATA);
2390         if (m == NULL) {
2391                 free(pfse, M_PFTEMP);
2392                 return;
2393         }
2394 #ifdef MAC
2395         mac_netinet_firewall_send(m);
2396 #endif
2397         if ((pf_mtag = pf_get_mtag(m)) == NULL) {
2398                 free(pfse, M_PFTEMP);
2399                 m_freem(m);
2400                 return;
2401         }
2402         if (tag)
2403                 m->m_flags |= M_SKIP_FIREWALL;
2404         pf_mtag->tag = rtag;
2405
2406         if (r != NULL && r->rtableid >= 0)
2407                 M_SETFIB(m, r->rtableid);
2408
2409 #ifdef ALTQ
2410         if (r != NULL && r->qid) {
2411                 pf_mtag->qid = r->qid;
2412
2413                 /* add hints for ecn */
2414                 pf_mtag->hdr = mtod(m, struct ip *);
2415         }
2416 #endif /* ALTQ */
2417         m->m_data += max_linkhdr;
2418         m->m_pkthdr.len = m->m_len = len;
2419         m->m_pkthdr.rcvif = NULL;
2420         bzero(m->m_data, len);
2421         switch (af) {
2422 #ifdef INET
2423         case AF_INET:
2424                 h = mtod(m, struct ip *);
2425
2426                 /* IP header fields included in the TCP checksum */
2427                 h->ip_p = IPPROTO_TCP;
2428                 h->ip_len = htons(tlen);
2429                 h->ip_src.s_addr = saddr->v4.s_addr;
2430                 h->ip_dst.s_addr = daddr->v4.s_addr;
2431
2432                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
2433                 break;
2434 #endif /* INET */
2435 #ifdef INET6
2436         case AF_INET6:
2437                 h6 = mtod(m, struct ip6_hdr *);
2438
2439                 /* IP header fields included in the TCP checksum */
2440                 h6->ip6_nxt = IPPROTO_TCP;
2441                 h6->ip6_plen = htons(tlen);
2442                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
2443                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
2444
2445                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
2446                 break;
2447 #endif /* INET6 */
2448         }
2449
2450         /* TCP header */
2451         th->th_sport = sport;
2452         th->th_dport = dport;
2453         th->th_seq = htonl(seq);
2454         th->th_ack = htonl(ack);
2455         th->th_off = tlen >> 2;
2456         th->th_flags = flags;
2457         th->th_win = htons(win);
2458
2459         if (mss) {
2460                 opt = (char *)(th + 1);
2461                 opt[0] = TCPOPT_MAXSEG;
2462                 opt[1] = 4;
2463                 HTONS(mss);
2464                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
2465         }
2466
2467         switch (af) {
2468 #ifdef INET
2469         case AF_INET:
2470                 /* TCP checksum */
2471                 th->th_sum = in_cksum(m, len);
2472
2473                 /* Finish the IP header */
2474                 h->ip_v = 4;
2475                 h->ip_hl = sizeof(*h) >> 2;
2476                 h->ip_tos = IPTOS_LOWDELAY;
2477                 h->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
2478                 h->ip_len = htons(len);
2479                 h->ip_ttl = ttl ? ttl : V_ip_defttl;
2480                 h->ip_sum = 0;
2481
2482                 pfse->pfse_type = PFSE_IP;
2483                 break;
2484 #endif /* INET */
2485 #ifdef INET6
2486         case AF_INET6:
2487                 /* TCP checksum */
2488                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
2489                     sizeof(struct ip6_hdr), tlen);
2490
2491                 h6->ip6_vfc |= IPV6_VERSION;
2492                 h6->ip6_hlim = IPV6_DEFHLIM;
2493
2494                 pfse->pfse_type = PFSE_IP6;
2495                 break;
2496 #endif /* INET6 */
2497         }
2498         pfse->pfse_m = m;
2499         pf_send(pfse);
2500 }
2501
2502 static int
2503 pf_ieee8021q_setpcp(struct mbuf *m, u_int8_t prio)
2504 {
2505         struct m_tag *mtag;
2506
2507         KASSERT(prio <= PF_PRIO_MAX,
2508             ("%s with invalid pcp", __func__));
2509
2510         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
2511         if (mtag == NULL) {
2512                 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
2513                     sizeof(uint8_t), M_NOWAIT);
2514                 if (mtag == NULL)
2515                         return (ENOMEM);
2516                 m_tag_prepend(m, mtag);
2517         }
2518
2519         *(uint8_t *)(mtag + 1) = prio;
2520         return (0);
2521 }
2522
2523 static int
2524 pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
2525 {
2526         struct m_tag *mtag;
2527         u_int8_t mpcp;
2528
2529         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
2530         if (mtag == NULL)
2531                 return (0);
2532
2533         if (prio == PF_PRIO_ZERO)
2534                 prio = 0;
2535
2536         mpcp = *(uint8_t *)(mtag + 1);
2537
2538         return (mpcp == prio);
2539 }
2540
2541 static void
2542 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
2543     struct pf_rule *r)
2544 {
2545         struct pf_send_entry *pfse;
2546         struct mbuf *m0;
2547         struct pf_mtag *pf_mtag;
2548
2549         /* Allocate outgoing queue entry, mbuf and mbuf tag. */
2550         pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
2551         if (pfse == NULL)
2552                 return;
2553
2554         if ((m0 = m_copypacket(m, M_NOWAIT)) == NULL) {
2555                 free(pfse, M_PFTEMP);
2556                 return;
2557         }
2558
2559         if ((pf_mtag = pf_get_mtag(m0)) == NULL) {
2560                 free(pfse, M_PFTEMP);
2561                 return;
2562         }
2563         /* XXX: revisit */
2564         m0->m_flags |= M_SKIP_FIREWALL;
2565
2566         if (r->rtableid >= 0)
2567                 M_SETFIB(m0, r->rtableid);
2568
2569 #ifdef ALTQ
2570         if (r->qid) {
2571                 pf_mtag->qid = r->qid;
2572                 /* add hints for ecn */
2573                 pf_mtag->hdr = mtod(m0, struct ip *);
2574         }
2575 #endif /* ALTQ */
2576
2577         switch (af) {
2578 #ifdef INET
2579         case AF_INET:
2580                 pfse->pfse_type = PFSE_ICMP;
2581                 break;
2582 #endif /* INET */
2583 #ifdef INET6
2584         case AF_INET6:
2585                 pfse->pfse_type = PFSE_ICMP6;
2586                 break;
2587 #endif /* INET6 */
2588         }
2589         pfse->pfse_m = m0;
2590         pfse->icmpopts.type = type;
2591         pfse->icmpopts.code = code;
2592         pf_send(pfse);
2593 }
2594
2595 /*
2596  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
2597  * If n is 0, they match if they are equal. If n is != 0, they match if they
2598  * are different.
2599  */
2600 int
2601 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
2602     struct pf_addr *b, sa_family_t af)
2603 {
2604         int     match = 0;
2605
2606         switch (af) {
2607 #ifdef INET
2608         case AF_INET:
2609                 if ((a->addr32[0] & m->addr32[0]) ==
2610                     (b->addr32[0] & m->addr32[0]))
2611                         match++;
2612                 break;
2613 #endif /* INET */
2614 #ifdef INET6
2615         case AF_INET6:
2616                 if (((a->addr32[0] & m->addr32[0]) ==
2617                      (b->addr32[0] & m->addr32[0])) &&
2618                     ((a->addr32[1] & m->addr32[1]) ==
2619                      (b->addr32[1] & m->addr32[1])) &&
2620                     ((a->addr32[2] & m->addr32[2]) ==
2621                      (b->addr32[2] & m->addr32[2])) &&
2622                     ((a->addr32[3] & m->addr32[3]) ==
2623                      (b->addr32[3] & m->addr32[3])))
2624                         match++;
2625                 break;
2626 #endif /* INET6 */
2627         }
2628         if (match) {
2629                 if (n)
2630                         return (0);
2631                 else
2632                         return (1);
2633         } else {
2634                 if (n)
2635                         return (1);
2636                 else
2637                         return (0);
2638         }
2639 }
2640
2641 /*
2642  * Return 1 if b <= a <= e, otherwise return 0.
2643  */
2644 int
2645 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
2646     struct pf_addr *a, sa_family_t af)
2647 {
2648         switch (af) {
2649 #ifdef INET
2650         case AF_INET:
2651                 if ((ntohl(a->addr32[0]) < ntohl(b->addr32[0])) ||
2652                     (ntohl(a->addr32[0]) > ntohl(e->addr32[0])))
2653                         return (0);
2654                 break;
2655 #endif /* INET */
2656 #ifdef INET6
2657         case AF_INET6: {
2658                 int     i;
2659
2660                 /* check a >= b */
2661                 for (i = 0; i < 4; ++i)
2662                         if (ntohl(a->addr32[i]) > ntohl(b->addr32[i]))
2663                                 break;
2664                         else if (ntohl(a->addr32[i]) < ntohl(b->addr32[i]))
2665                                 return (0);
2666                 /* check a <= e */
2667                 for (i = 0; i < 4; ++i)
2668                         if (ntohl(a->addr32[i]) < ntohl(e->addr32[i]))
2669                                 break;
2670                         else if (ntohl(a->addr32[i]) > ntohl(e->addr32[i]))
2671                                 return (0);
2672                 break;
2673         }
2674 #endif /* INET6 */
2675         }
2676         return (1);
2677 }
2678
2679 static int
2680 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
2681 {
2682         switch (op) {
2683         case PF_OP_IRG:
2684                 return ((p > a1) && (p < a2));
2685         case PF_OP_XRG:
2686                 return ((p < a1) || (p > a2));
2687         case PF_OP_RRG:
2688                 return ((p >= a1) && (p <= a2));
2689         case PF_OP_EQ:
2690                 return (p == a1);
2691         case PF_OP_NE:
2692                 return (p != a1);
2693         case PF_OP_LT:
2694                 return (p < a1);
2695         case PF_OP_LE:
2696                 return (p <= a1);
2697         case PF_OP_GT:
2698                 return (p > a1);
2699         case PF_OP_GE:
2700                 return (p >= a1);
2701         }
2702         return (0); /* never reached */
2703 }
2704
2705 int
2706 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
2707 {
2708         NTOHS(a1);
2709         NTOHS(a2);
2710         NTOHS(p);
2711         return (pf_match(op, a1, a2, p));
2712 }
2713
2714 static int
2715 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
2716 {
2717         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2718                 return (0);
2719         return (pf_match(op, a1, a2, u));
2720 }
2721
2722 static int
2723 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
2724 {
2725         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
2726                 return (0);
2727         return (pf_match(op, a1, a2, g));
2728 }
2729
2730 int
2731 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag, int mtag)
2732 {
2733         if (*tag == -1)
2734                 *tag = mtag;
2735
2736         return ((!r->match_tag_not && r->match_tag == *tag) ||
2737             (r->match_tag_not && r->match_tag != *tag));
2738 }
2739
2740 int
2741 pf_tag_packet(struct mbuf *m, struct pf_pdesc *pd, int tag)
2742 {
2743
2744         KASSERT(tag > 0, ("%s: tag %d", __func__, tag));
2745
2746         if (pd->pf_mtag == NULL && ((pd->pf_mtag = pf_get_mtag(m)) == NULL))
2747                 return (ENOMEM);
2748
2749         pd->pf_mtag->tag = tag;
2750
2751         return (0);
2752 }
2753
2754 #define PF_ANCHOR_STACKSIZE     32
2755 struct pf_anchor_stackframe {
2756         struct pf_ruleset       *rs;
2757         struct pf_rule          *r;     /* XXX: + match bit */
2758         struct pf_anchor        *child;
2759 };
2760
2761 /*
2762  * XXX: We rely on malloc(9) returning pointer aligned addresses.
2763  */
2764 #define PF_ANCHORSTACK_MATCH    0x00000001
2765 #define PF_ANCHORSTACK_MASK     (PF_ANCHORSTACK_MATCH)
2766
2767 #define PF_ANCHOR_MATCH(f)      ((uintptr_t)(f)->r & PF_ANCHORSTACK_MATCH)
2768 #define PF_ANCHOR_RULE(f)       (struct pf_rule *)                      \
2769                                 ((uintptr_t)(f)->r & ~PF_ANCHORSTACK_MASK)
2770 #define PF_ANCHOR_SET_MATCH(f)  do { (f)->r = (void *)                  \
2771                                 ((uintptr_t)(f)->r | PF_ANCHORSTACK_MATCH);  \
2772 } while (0)
2773
2774 void
2775 pf_step_into_anchor(struct pf_anchor_stackframe *stack, int *depth,
2776     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2777     int *match)
2778 {
2779         struct pf_anchor_stackframe     *f;
2780
2781         PF_RULES_RASSERT();
2782
2783         if (match)
2784                 *match = 0;
2785         if (*depth >= PF_ANCHOR_STACKSIZE) {
2786                 printf("%s: anchor stack overflow on %s\n",
2787                     __func__, (*r)->anchor->name);
2788                 *r = TAILQ_NEXT(*r, entries);
2789                 return;
2790         } else if (*depth == 0 && a != NULL)
2791                 *a = *r;
2792         f = stack + (*depth)++;
2793         f->rs = *rs;
2794         f->r = *r;
2795         if ((*r)->anchor_wildcard) {
2796                 struct pf_anchor_node *parent = &(*r)->anchor->children;
2797
2798                 if ((f->child = RB_MIN(pf_anchor_node, parent)) == NULL) {
2799                         *r = NULL;
2800                         return;
2801                 }
2802                 *rs = &f->child->ruleset;
2803         } else {
2804                 f->child = NULL;
2805                 *rs = &(*r)->anchor->ruleset;
2806         }
2807         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2808 }
2809
2810 int
2811 pf_step_out_of_anchor(struct pf_anchor_stackframe *stack, int *depth,
2812     struct pf_ruleset **rs, int n, struct pf_rule **r, struct pf_rule **a,
2813     int *match)
2814 {
2815         struct pf_anchor_stackframe     *f;
2816         struct pf_rule *fr;
2817         int quick = 0;
2818
2819         PF_RULES_RASSERT();
2820
2821         do {
2822                 if (*depth <= 0)
2823                         break;
2824                 f = stack + *depth - 1;
2825                 fr = PF_ANCHOR_RULE(f);
2826                 if (f->child != NULL) {
2827                         struct pf_anchor_node *parent;
2828
2829                         /*
2830                          * This block traverses through
2831                          * a wildcard anchor.
2832                          */
2833                         parent = &fr->anchor->children;
2834                         if (match != NULL && *match) {
2835                                 /*
2836                                  * If any of "*" matched, then
2837                                  * "foo/ *" matched, mark frame
2838                                  * appropriately.
2839                                  */
2840                                 PF_ANCHOR_SET_MATCH(f);
2841                                 *match = 0;
2842                         }
2843                         f->child = RB_NEXT(pf_anchor_node, parent, f->child);
2844                         if (f->child != NULL) {
2845                                 *rs = &f->child->ruleset;
2846                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
2847                                 if (*r == NULL)
2848                                         continue;
2849                                 else
2850                                         break;
2851                         }
2852                 }
2853                 (*depth)--;
2854                 if (*depth == 0 && a != NULL)
2855                         *a = NULL;
2856                 *rs = f->rs;
2857                 if (PF_ANCHOR_MATCH(f) || (match != NULL && *match))
2858                         quick = fr->quick;
2859                 *r = TAILQ_NEXT(fr, entries);
2860         } while (*r == NULL);
2861
2862         return (quick);
2863 }
2864
2865 #ifdef INET6
2866 void
2867 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
2868     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
2869 {
2870         switch (af) {
2871 #ifdef INET
2872         case AF_INET:
2873                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2874                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2875                 break;
2876 #endif /* INET */
2877         case AF_INET6:
2878                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
2879                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
2880                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
2881                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
2882                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
2883                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
2884                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
2885                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
2886                 break;
2887         }
2888 }
2889
2890 void
2891 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
2892 {
2893         switch (af) {
2894 #ifdef INET
2895         case AF_INET:
2896                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
2897                 break;
2898 #endif /* INET */
2899         case AF_INET6:
2900                 if (addr->addr32[3] == 0xffffffff) {
2901                         addr->addr32[3] = 0;
2902                         if (addr->addr32[2] == 0xffffffff) {
2903                                 addr->addr32[2] = 0;
2904                                 if (addr->addr32[1] == 0xffffffff) {
2905                                         addr->addr32[1] = 0;
2906                                         addr->addr32[0] =
2907                                             htonl(ntohl(addr->addr32[0]) + 1);
2908                                 } else
2909                                         addr->addr32[1] =
2910                                             htonl(ntohl(addr->addr32[1]) + 1);
2911                         } else
2912                                 addr->addr32[2] =
2913                                     htonl(ntohl(addr->addr32[2]) + 1);
2914                 } else
2915                         addr->addr32[3] =
2916                             htonl(ntohl(addr->addr32[3]) + 1);
2917                 break;
2918         }
2919 }
2920 #endif /* INET6 */
2921
2922 int
2923 pf_socket_lookup(int direction, struct pf_pdesc *pd, struct mbuf *m)
2924 {
2925         struct pf_addr          *saddr, *daddr;
2926         u_int16_t                sport, dport;
2927         struct inpcbinfo        *pi;
2928         struct inpcb            *inp;
2929
2930         pd->lookup.uid = UID_MAX;
2931         pd->lookup.gid = GID_MAX;
2932
2933         switch (pd->proto) {
2934         case IPPROTO_TCP:
2935                 if (pd->hdr.tcp == NULL)
2936                         return (-1);
2937                 sport = pd->hdr.tcp->th_sport;
2938                 dport = pd->hdr.tcp->th_dport;
2939                 pi = &V_tcbinfo;
2940                 break;
2941         case IPPROTO_UDP:
2942                 if (pd->hdr.udp == NULL)
2943                         return (-1);
2944                 sport = pd->hdr.udp->uh_sport;
2945                 dport = pd->hdr.udp->uh_dport;
2946                 pi = &V_udbinfo;
2947                 break;
2948         default:
2949                 return (-1);
2950         }
2951         if (direction == PF_IN) {
2952                 saddr = pd->src;
2953                 daddr = pd->dst;
2954         } else {
2955                 u_int16_t       p;
2956
2957                 p = sport;
2958                 sport = dport;
2959                 dport = p;
2960                 saddr = pd->dst;
2961                 daddr = pd->src;
2962         }
2963         switch (pd->af) {
2964 #ifdef INET
2965         case AF_INET:
2966                 inp = in_pcblookup_mbuf(pi, saddr->v4, sport, daddr->v4,
2967                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2968                 if (inp == NULL) {
2969                         inp = in_pcblookup_mbuf(pi, saddr->v4, sport,
2970                            daddr->v4, dport, INPLOOKUP_WILDCARD |
2971                            INPLOOKUP_RLOCKPCB, NULL, m);
2972                         if (inp == NULL)
2973                                 return (-1);
2974                 }
2975                 break;
2976 #endif /* INET */
2977 #ifdef INET6
2978         case AF_INET6:
2979                 inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport, &daddr->v6,
2980                     dport, INPLOOKUP_RLOCKPCB, NULL, m);
2981                 if (inp == NULL) {
2982                         inp = in6_pcblookup_mbuf(pi, &saddr->v6, sport,
2983                             &daddr->v6, dport, INPLOOKUP_WILDCARD |
2984                             INPLOOKUP_RLOCKPCB, NULL, m);
2985                         if (inp == NULL)
2986                                 return (-1);
2987                 }
2988                 break;
2989 #endif /* INET6 */
2990
2991         default:
2992                 return (-1);
2993         }
2994         INP_RLOCK_ASSERT(inp);
2995         pd->lookup.uid = inp->inp_cred->cr_uid;
2996         pd->lookup.gid = inp->inp_cred->cr_groups[0];
2997         INP_RUNLOCK(inp);
2998
2999         return (1);
3000 }
3001
3002 static u_int8_t
3003 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3004 {
3005         int              hlen;
3006         u_int8_t         hdr[60];
3007         u_int8_t        *opt, optlen;
3008         u_int8_t         wscale = 0;
3009
3010         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
3011         if (hlen <= sizeof(struct tcphdr))
3012                 return (0);
3013         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3014                 return (0);
3015         opt = hdr + sizeof(struct tcphdr);
3016         hlen -= sizeof(struct tcphdr);
3017         while (hlen >= 3) {
3018                 switch (*opt) {
3019                 case TCPOPT_EOL:
3020                 case TCPOPT_NOP:
3021                         ++opt;
3022                         --hlen;
3023                         break;
3024                 case TCPOPT_WINDOW:
3025                         wscale = opt[2];
3026                         if (wscale > TCP_MAX_WINSHIFT)
3027                                 wscale = TCP_MAX_WINSHIFT;
3028                         wscale |= PF_WSCALE_FLAG;
3029                         /* FALLTHROUGH */
3030                 default:
3031                         optlen = opt[1];
3032                         if (optlen < 2)
3033                                 optlen = 2;
3034                         hlen -= optlen;
3035                         opt += optlen;
3036                         break;
3037                 }
3038         }
3039         return (wscale);
3040 }
3041
3042 static u_int16_t
3043 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
3044 {
3045         int              hlen;
3046         u_int8_t         hdr[60];
3047         u_int8_t        *opt, optlen;
3048         u_int16_t        mss = V_tcp_mssdflt;
3049
3050         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
3051         if (hlen <= sizeof(struct tcphdr))
3052                 return (0);
3053         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
3054                 return (0);
3055         opt = hdr + sizeof(struct tcphdr);
3056         hlen -= sizeof(struct tcphdr);
3057         while (hlen >= TCPOLEN_MAXSEG) {
3058                 switch (*opt) {
3059                 case TCPOPT_EOL:
3060                 case TCPOPT_NOP:
3061                         ++opt;
3062                         --hlen;
3063                         break;
3064                 case TCPOPT_MAXSEG:
3065                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
3066                         NTOHS(mss);
3067                         /* FALLTHROUGH */
3068                 default:
3069                         optlen = opt[1];
3070                         if (optlen < 2)
3071                                 optlen = 2;
3072                         hlen -= optlen;
3073                         opt += optlen;
3074                         break;
3075                 }
3076         }
3077         return (mss);
3078 }
3079
3080 static u_int16_t
3081 pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
3082 {
3083 #ifdef INET
3084         struct nhop4_basic      nh4;
3085 #endif /* INET */
3086 #ifdef INET6
3087         struct nhop6_basic      nh6;
3088         struct in6_addr         dst6;
3089         uint32_t                scopeid;
3090 #endif /* INET6 */
3091         int                      hlen = 0;
3092         uint16_t                 mss = 0;
3093
3094         switch (af) {
3095 #ifdef INET
3096         case AF_INET:
3097                 hlen = sizeof(struct ip);
3098                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
3099                         mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
3100                 break;
3101 #endif /* INET */
3102 #ifdef INET6
3103         case AF_INET6:
3104                 hlen = sizeof(struct ip6_hdr);
3105                 in6_splitscope(&addr->v6, &dst6, &scopeid);
3106                 if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
3107                         mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
3108                 break;
3109 #endif /* INET6 */
3110         }
3111
3112         mss = max(V_tcp_mssdflt, mss);
3113         mss = min(mss, offer);
3114         mss = max(mss, 64);             /* sanity - at least max opt space */
3115         return (mss);
3116 }
3117
3118 static u_int32_t
3119 pf_tcp_iss(struct pf_pdesc *pd)
3120 {
3121         MD5_CTX ctx;
3122         u_int32_t digest[4];
3123
3124         if (V_pf_tcp_secret_init == 0) {
3125                 read_random(&V_pf_tcp_secret, sizeof(V_pf_tcp_secret));
3126                 MD5Init(&V_pf_tcp_secret_ctx);
3127                 MD5Update(&V_pf_tcp_secret_ctx, V_pf_tcp_secret,
3128                     sizeof(V_pf_tcp_secret));
3129                 V_pf_tcp_secret_init = 1;
3130         }
3131
3132         ctx = V_pf_tcp_secret_ctx;
3133
3134         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
3135         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
3136         if (pd->af == AF_INET6) {
3137                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
3138                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
3139         } else {
3140                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
3141                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
3142         }
3143         MD5Final((u_char *)digest, &ctx);
3144         V_pf_tcp_iss_off += 4096;
3145 #define ISN_RANDOM_INCREMENT (4096 - 1)
3146         return (digest[0] + (arc4random() & ISN_RANDOM_INCREMENT) +
3147             V_pf_tcp_iss_off);
3148 #undef  ISN_RANDOM_INCREMENT
3149 }
3150
3151 static int
3152 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
3153     struct pfi_kif *kif, struct mbuf *m, int off, struct pf_pdesc *pd,
3154     struct pf_rule **am, struct pf_ruleset **rsm, struct inpcb *inp)
3155 {
3156         struct pf_rule          *nr = NULL;
3157         struct pf_addr          * const saddr = pd->src;
3158         struct pf_addr          * const daddr = pd->dst;
3159         sa_family_t              af = pd->af;
3160         struct pf_rule          *r, *a = NULL;
3161         struct pf_ruleset       *ruleset = NULL;
3162         struct pf_src_node      *nsn = NULL;
3163         struct tcphdr           *th = pd->hdr.tcp;
3164         struct pf_state_key     *sk = NULL, *nk = NULL;
3165         u_short                  reason;
3166         int                      rewrite = 0, hdrlen = 0;
3167         int                      tag = -1, rtableid = -1;
3168         int                      asd = 0;
3169         int                      match = 0;
3170         int                      state_icmp = 0;
3171         u_int16_t                sport = 0, dport = 0;
3172         u_int16_t                bproto_sum = 0, bip_sum = 0;
3173         u_int8_t                 icmptype = 0, icmpcode = 0;
3174         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3175
3176         PF_RULES_RASSERT();
3177
3178         if (inp != NULL) {
3179                 INP_LOCK_ASSERT(inp);
3180                 pd->lookup.uid = inp->inp_cred->cr_uid;
3181                 pd->lookup.gid = inp->inp_cred->cr_groups[0];
3182                 pd->lookup.done = 1;
3183         }
3184
3185         switch (pd->proto) {
3186         case IPPROTO_TCP:
3187                 sport = th->th_sport;
3188                 dport = th->th_dport;
3189                 hdrlen = sizeof(*th);
3190                 break;
3191         case IPPROTO_UDP:
3192                 sport = pd->hdr.udp->uh_sport;
3193                 dport = pd->hdr.udp->uh_dport;
3194                 hdrlen = sizeof(*pd->hdr.udp);
3195                 break;
3196 #ifdef INET
3197         case IPPROTO_ICMP:
3198                 if (pd->af != AF_INET)
3199                         break;
3200                 sport = dport = pd->hdr.icmp->icmp_id;
3201                 hdrlen = sizeof(*pd->hdr.icmp);
3202                 icmptype = pd->hdr.icmp->icmp_type;
3203                 icmpcode = pd->hdr.icmp->icmp_code;
3204
3205                 if (icmptype == ICMP_UNREACH ||
3206                     icmptype == ICMP_SOURCEQUENCH ||
3207                     icmptype == ICMP_REDIRECT ||
3208                     icmptype == ICMP_TIMXCEED ||
3209                     icmptype == ICMP_PARAMPROB)
3210                         state_icmp++;
3211                 break;
3212 #endif /* INET */
3213 #ifdef INET6
3214         case IPPROTO_ICMPV6:
3215                 if (af != AF_INET6)
3216                         break;
3217                 sport = dport = pd->hdr.icmp6->icmp6_id;
3218                 hdrlen = sizeof(*pd->hdr.icmp6);
3219                 icmptype = pd->hdr.icmp6->icmp6_type;
3220                 icmpcode = pd->hdr.icmp6->icmp6_code;
3221
3222                 if (icmptype == ICMP6_DST_UNREACH ||
3223                     icmptype == ICMP6_PACKET_TOO_BIG ||
3224                     icmptype == ICMP6_TIME_EXCEEDED ||
3225                     icmptype == ICMP6_PARAM_PROB)
3226                         state_icmp++;
3227                 break;
3228 #endif /* INET6 */
3229         default:
3230                 sport = dport = hdrlen = 0;
3231                 break;
3232         }
3233
3234         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3235
3236         /* check packet for BINAT/NAT/RDR */
3237         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn, &sk,
3238             &nk, saddr, daddr, sport, dport, anchor_stack)) != NULL) {
3239                 KASSERT(sk != NULL, ("%s: null sk", __func__));
3240                 KASSERT(nk != NULL, ("%s: null nk", __func__));
3241
3242                 if (pd->ip_sum)
3243                         bip_sum = *pd->ip_sum;
3244
3245                 switch (pd->proto) {
3246                 case IPPROTO_TCP:
3247                         bproto_sum = th->th_sum;
3248                         pd->proto_sum = &th->th_sum;
3249
3250                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3251                             nk->port[pd->sidx] != sport) {
3252                                 pf_change_ap(m, saddr, &th->th_sport, pd->ip_sum,
3253                                     &th->th_sum, &nk->addr[pd->sidx],
3254                                     nk->port[pd->sidx], 0, af);
3255                                 pd->sport = &th->th_sport;
3256                                 sport = th->th_sport;
3257                         }
3258
3259                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3260                             nk->port[pd->didx] != dport) {
3261                                 pf_change_ap(m, daddr, &th->th_dport, pd->ip_sum,
3262                                     &th->th_sum, &nk->addr[pd->didx],
3263                                     nk->port[pd->didx], 0, af);
3264                                 dport = th->th_dport;
3265                                 pd->dport = &th->th_dport;
3266                         }
3267                         rewrite++;
3268                         break;
3269                 case IPPROTO_UDP:
3270                         bproto_sum = pd->hdr.udp->uh_sum;
3271                         pd->proto_sum = &pd->hdr.udp->uh_sum;
3272
3273                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
3274                             nk->port[pd->sidx] != sport) {
3275                                 pf_change_ap(m, saddr, &pd->hdr.udp->uh_sport,
3276                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3277                                     &nk->addr[pd->sidx],
3278                                     nk->port[pd->sidx], 1, af);
3279                                 sport = pd->hdr.udp->uh_sport;
3280                                 pd->sport = &pd->hdr.udp->uh_sport;
3281                         }
3282
3283                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
3284                             nk->port[pd->didx] != dport) {
3285                                 pf_change_ap(m, daddr, &pd->hdr.udp->uh_dport,
3286                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
3287                                     &nk->addr[pd->didx],
3288                                     nk->port[pd->didx], 1, af);
3289                                 dport = pd->hdr.udp->uh_dport;
3290                                 pd->dport = &pd->hdr.udp->uh_dport;
3291                         }
3292                         rewrite++;
3293                         break;
3294 #ifdef INET
3295                 case IPPROTO_ICMP:
3296                         nk->port[0] = nk->port[1];
3297                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
3298                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
3299                                     nk->addr[pd->sidx].v4.s_addr, 0);
3300
3301                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
3302                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
3303                                     nk->addr[pd->didx].v4.s_addr, 0);
3304
3305                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
3306                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
3307                                     pd->hdr.icmp->icmp_cksum, sport,
3308                                     nk->port[1], 0);
3309                                 pd->hdr.icmp->icmp_id = nk->port[1];
3310                                 pd->sport = &pd->hdr.icmp->icmp_id;
3311                         }
3312                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
3313                         break;
3314 #endif /* INET */
3315 #ifdef INET6
3316                 case IPPROTO_ICMPV6:
3317                         nk->port[0] = nk->port[1];
3318                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
3319                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
3320                                     &nk->addr[pd->sidx], 0);
3321
3322                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
3323                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
3324                                     &nk->addr[pd->didx], 0);
3325                         rewrite++;
3326                         break;
3327 #endif /* INET */
3328                 default:
3329                         switch (af) {
3330 #ifdef INET
3331                         case AF_INET:
3332                                 if (PF_ANEQ(saddr,
3333                                     &nk->addr[pd->sidx], AF_INET))
3334                                         pf_change_a(&saddr->v4.s_addr,
3335                                             pd->ip_sum,
3336                                             nk->addr[pd->sidx].v4.s_addr, 0);
3337
3338                                 if (PF_ANEQ(daddr,
3339                                     &nk->addr[pd->didx], AF_INET))
3340                                         pf_change_a(&daddr->v4.s_addr,
3341                                             pd->ip_sum,
3342                                             nk->addr[pd->didx].v4.s_addr, 0);
3343                                 break;
3344 #endif /* INET */
3345 #ifdef INET6
3346                         case AF_INET6:
3347                                 if (PF_ANEQ(saddr,
3348                                     &nk->addr[pd->sidx], AF_INET6))
3349                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
3350
3351                                 if (PF_ANEQ(daddr,
3352                                     &nk->addr[pd->didx], AF_INET6))
3353                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
3354                                 break;
3355 #endif /* INET */
3356                         }
3357                         break;
3358                 }
3359                 if (nr->natpass)
3360                         r = NULL;
3361                 pd->nat_rule = nr;
3362         }
3363
3364         while (r != NULL) {
3365                 r->evaluations++;
3366                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3367                         r = r->skip[PF_SKIP_IFP].ptr;
3368                 else if (r->direction && r->direction != direction)
3369                         r = r->skip[PF_SKIP_DIR].ptr;
3370                 else if (r->af && r->af != af)
3371                         r = r->skip[PF_SKIP_AF].ptr;
3372                 else if (r->proto && r->proto != pd->proto)
3373                         r = r->skip[PF_SKIP_PROTO].ptr;
3374                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
3375                     r->src.neg, kif, M_GETFIB(m)))
3376                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3377                 /* tcp/udp only. port_op always 0 in other cases */
3378                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
3379                     r->src.port[0], r->src.port[1], sport))
3380                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
3381                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
3382                     r->dst.neg, NULL, M_GETFIB(m)))
3383                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3384                 /* tcp/udp only. port_op always 0 in other cases */
3385                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
3386                     r->dst.port[0], r->dst.port[1], dport))
3387                         r = r->skip[PF_SKIP_DST_PORT].ptr;
3388                 /* icmp only. type always 0 in other cases */
3389                 else if (r->type && r->type != icmptype + 1)
3390                         r = TAILQ_NEXT(r, entries);
3391                 /* icmp only. type always 0 in other cases */
3392                 else if (r->code && r->code != icmpcode + 1)
3393                         r = TAILQ_NEXT(r, entries);
3394                 else if (r->tos && !(r->tos == pd->tos))
3395                         r = TAILQ_NEXT(r, entries);
3396                 else if (r->rule_flag & PFRULE_FRAGMENT)
3397                         r = TAILQ_NEXT(r, entries);
3398                 else if (pd->proto == IPPROTO_TCP &&
3399                     (r->flagset & th->th_flags) != r->flags)
3400                         r = TAILQ_NEXT(r, entries);
3401                 /* tcp/udp only. uid.op always 0 in other cases */
3402                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
3403                     pf_socket_lookup(direction, pd, m), 1)) &&
3404                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
3405                     pd->lookup.uid))
3406                         r = TAILQ_NEXT(r, entries);
3407                 /* tcp/udp only. gid.op always 0 in other cases */
3408                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
3409                     pf_socket_lookup(direction, pd, m), 1)) &&
3410                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
3411                     pd->lookup.gid))
3412                         r = TAILQ_NEXT(r, entries);
3413                 else if (r->prio &&
3414                     !pf_match_ieee8021q_pcp(r->prio, m))
3415                         r = TAILQ_NEXT(r, entries);
3416                 else if (r->prob &&
3417                     r->prob <= arc4random())
3418                         r = TAILQ_NEXT(r, entries);
3419                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3420                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3421                         r = TAILQ_NEXT(r, entries);
3422                 else if (r->os_fingerprint != PF_OSFP_ANY &&
3423                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
3424                     pf_osfp_fingerprint(pd, m, off, th),
3425                     r->os_fingerprint)))
3426                         r = TAILQ_NEXT(r, entries);
3427                 else {
3428                         if (r->tag)
3429                                 tag = r->tag;
3430                         if (r->rtableid >= 0)
3431                                 rtableid = r->rtableid;
3432                         if (r->anchor == NULL) {
3433                                 match = 1;
3434                                 *rm = r;
3435                                 *am = a;
3436                                 *rsm = ruleset;
3437                                 if ((*rm)->quick)
3438                                         break;
3439                                 r = TAILQ_NEXT(r, entries);
3440                         } else
3441                                 pf_step_into_anchor(anchor_stack, &asd,
3442                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3443                                     &match);
3444                 }
3445                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3446                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3447                         break;
3448         }
3449         r = *rm;
3450         a = *am;
3451         ruleset = *rsm;
3452
3453         REASON_SET(&reason, PFRES_MATCH);
3454
3455         if (r->log || (nr != NULL && nr->log)) {
3456                 if (rewrite)
3457                         m_copyback(m, off, hdrlen, pd->hdr.any);
3458                 PFLOG_PACKET(kif, m, af, direction, reason, r->log ? r : nr, a,
3459                     ruleset, pd, 1);
3460         }
3461
3462         if ((r->action == PF_DROP) &&
3463             ((r->rule_flag & PFRULE_RETURNRST) ||
3464             (r->rule_flag & PFRULE_RETURNICMP) ||
3465             (r->rule_flag & PFRULE_RETURN))) {
3466                 /* undo NAT changes, if they have taken place */
3467                 if (nr != NULL) {
3468                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
3469                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
3470                         if (pd->sport)
3471                                 *pd->sport = sk->port[pd->sidx];
3472                         if (pd->dport)
3473                                 *pd->dport = sk->port[pd->didx];
3474                         if (pd->proto_sum)
3475                                 *pd->proto_sum = bproto_sum;
3476                         if (pd->ip_sum)
3477                                 *pd->ip_sum = bip_sum;
3478                         m_copyback(m, off, hdrlen, pd->hdr.any);
3479                 }
3480                 if (pd->proto == IPPROTO_TCP &&
3481                     ((r->rule_flag & PFRULE_RETURNRST) ||
3482                     (r->rule_flag & PFRULE_RETURN)) &&
3483                     !(th->th_flags & TH_RST)) {
3484                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
3485                         int              len = 0;
3486 #ifdef INET
3487                         struct ip       *h4;
3488 #endif
3489 #ifdef INET6
3490                         struct ip6_hdr  *h6;
3491 #endif
3492
3493                         switch (af) {
3494 #ifdef INET
3495                         case AF_INET:
3496                                 h4 = mtod(m, struct ip *);
3497                                 len = ntohs(h4->ip_len) - off;
3498                                 break;
3499 #endif
3500 #ifdef INET6
3501                         case AF_INET6:
3502                                 h6 = mtod(m, struct ip6_hdr *);
3503                                 len = ntohs(h6->ip6_plen) - (off - sizeof(*h6));
3504                                 break;
3505 #endif
3506                         }
3507
3508                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
3509                                 REASON_SET(&reason, PFRES_PROTCKSUM);
3510                         else {
3511                                 if (th->th_flags & TH_SYN)
3512                                         ack++;
3513                                 if (th->th_flags & TH_FIN)
3514                                         ack++;
3515                                 pf_send_tcp(m, r, af, pd->dst,
3516                                     pd->src, th->th_dport, th->th_sport,
3517                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
3518                                     r->return_ttl, 1, 0, kif->pfik_ifp);
3519                         }
3520                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
3521                     r->return_icmp)
3522                         pf_send_icmp(m, r->return_icmp >> 8,
3523                             r->return_icmp & 255, af, r);
3524                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
3525                     r->return_icmp6)
3526                         pf_send_icmp(m, r->return_icmp6 >> 8,
3527                             r->return_icmp6 & 255, af, r);
3528         }
3529
3530         if (r->action == PF_DROP)
3531                 goto cleanup;
3532
3533         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3534                 REASON_SET(&reason, PFRES_MEMORY);
3535                 goto cleanup;
3536         }
3537         if (rtableid >= 0)
3538                 M_SETFIB(m, rtableid);
3539
3540         if (!state_icmp && (r->keep_state || nr != NULL ||
3541             (pd->flags & PFDESC_TCP_NORM))) {
3542                 int action;
3543                 action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
3544                     sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
3545                     hdrlen);
3546                 if (action != PF_PASS)
3547                         return (action);
3548         } else {
3549                 if (sk != NULL)
3550                         uma_zfree(V_pf_state_key_z, sk);
3551                 if (nk != NULL)
3552                         uma_zfree(V_pf_state_key_z, nk);
3553         }
3554
3555         /* copy back packet headers if we performed NAT operations */
3556         if (rewrite)
3557                 m_copyback(m, off, hdrlen, pd->hdr.any);
3558
3559         if (*sm != NULL && !((*sm)->state_flags & PFSTATE_NOSYNC) &&
3560             direction == PF_OUT &&
3561             pfsync_defer_ptr != NULL && pfsync_defer_ptr(*sm, m))
3562                 /*
3563                  * We want the state created, but we dont
3564                  * want to send this in case a partner
3565                  * firewall has to know about it to allow
3566                  * replies through it.
3567                  */
3568                 return (PF_DEFER);
3569
3570         return (PF_PASS);
3571
3572 cleanup:
3573         if (sk != NULL)
3574                 uma_zfree(V_pf_state_key_z, sk);
3575         if (nk != NULL)
3576                 uma_zfree(V_pf_state_key_z, nk);
3577         return (PF_DROP);
3578 }
3579
3580 static int
3581 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
3582     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *nk,
3583     struct pf_state_key *sk, struct mbuf *m, int off, u_int16_t sport,
3584     u_int16_t dport, int *rewrite, struct pfi_kif *kif, struct pf_state **sm,
3585     int tag, u_int16_t bproto_sum, u_int16_t bip_sum, int hdrlen)
3586 {
3587         struct pf_state         *s = NULL;
3588         struct pf_src_node      *sn = NULL;
3589         struct tcphdr           *th = pd->hdr.tcp;
3590         u_int16_t                mss = V_tcp_mssdflt;
3591         u_short                  reason;
3592
3593         /* check maximums */
3594         if (r->max_states &&
3595             (counter_u64_fetch(r->states_cur) >= r->max_states)) {
3596                 counter_u64_add(V_pf_status.lcounters[LCNT_STATES], 1);
3597                 REASON_SET(&reason, PFRES_MAXSTATES);
3598                 goto csfailed;
3599         }
3600         /* src node for filter rule */
3601         if ((r->rule_flag & PFRULE_SRCTRACK ||
3602             r->rpool.opts & PF_POOL_STICKYADDR) &&
3603             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
3604                 REASON_SET(&reason, PFRES_SRCLIMIT);
3605                 goto csfailed;
3606         }
3607         /* src node for translation rule */
3608         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
3609             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
3610                 REASON_SET(&reason, PFRES_SRCLIMIT);
3611                 goto csfailed;
3612         }
3613         s = uma_zalloc(V_pf_state_z, M_NOWAIT | M_ZERO);
3614         if (s == NULL) {
3615                 REASON_SET(&reason, PFRES_MEMORY);
3616                 goto csfailed;
3617         }
3618         s->rule.ptr = r;
3619         s->nat_rule.ptr = nr;
3620         s->anchor.ptr = a;
3621         STATE_INC_COUNTERS(s);
3622         if (r->allow_opts)
3623                 s->state_flags |= PFSTATE_ALLOWOPTS;
3624         if (r->rule_flag & PFRULE_STATESLOPPY)
3625                 s->state_flags |= PFSTATE_SLOPPY;
3626         s->log = r->log & PF_LOG_ALL;
3627         s->sync_state = PFSYNC_S_NONE;
3628         if (nr != NULL)
3629                 s->log |= nr->log & PF_LOG_ALL;
3630         switch (pd->proto) {
3631         case IPPROTO_TCP:
3632                 s->src.seqlo = ntohl(th->th_seq);
3633                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
3634                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
3635                     r->keep_state == PF_STATE_MODULATE) {
3636                         /* Generate sequence number modulator */
3637                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
3638                             0)
3639                                 s->src.seqdiff = 1;
3640                         pf_change_proto_a(m, &th->th_seq, &th->th_sum,
3641                             htonl(s->src.seqlo + s->src.seqdiff), 0);
3642                         *rewrite = 1;
3643                 } else
3644                         s->src.seqdiff = 0;
3645                 if (th->th_flags & TH_SYN) {
3646                         s->src.seqhi++;
3647                         s->src.wscale = pf_get_wscale(m, off,
3648                             th->th_off, pd->af);
3649                 }
3650                 s->src.max_win = MAX(ntohs(th->th_win), 1);
3651                 if (s->src.wscale & PF_WSCALE_MASK) {
3652                         /* Remove scale factor from initial window */
3653                         int win = s->src.max_win;
3654                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
3655                         s->src.max_win = (win - 1) >>
3656                             (s->src.wscale & PF_WSCALE_MASK);
3657                 }
3658                 if (th->th_flags & TH_FIN)
3659                         s->src.seqhi++;
3660                 s->dst.seqhi = 1;
3661                 s->dst.max_win = 1;
3662                 s->src.state = TCPS_SYN_SENT;
3663                 s->dst.state = TCPS_CLOSED;
3664                 s->timeout = PFTM_TCP_FIRST_PACKET;
3665                 break;
3666         case IPPROTO_UDP:
3667                 s->src.state = PFUDPS_SINGLE;
3668                 s->dst.state = PFUDPS_NO_TRAFFIC;
3669                 s->timeout = PFTM_UDP_FIRST_PACKET;
3670                 break;
3671         case IPPROTO_ICMP:
3672 #ifdef INET6
3673         case IPPROTO_ICMPV6:
3674 #endif
3675                 s->timeout = PFTM_ICMP_FIRST_PACKET;
3676                 break;
3677         default:
3678                 s->src.state = PFOTHERS_SINGLE;
3679                 s->dst.state = PFOTHERS_NO_TRAFFIC;
3680                 s->timeout = PFTM_OTHER_FIRST_PACKET;
3681         }
3682
3683         if (r->rt) {
3684                 if (pf_map_addr(pd->af, r, pd->src, &s->rt_addr, NULL, &sn)) {
3685                         REASON_SET(&reason, PFRES_MAPFAILED);
3686                         pf_src_tree_remove_state(s);
3687                         STATE_DEC_COUNTERS(s);
3688                         uma_zfree(V_pf_state_z, s);
3689                         goto csfailed;
3690                 }
3691                 s->rt_kif = r->rpool.cur->kif;
3692         }
3693
3694         s->creation = time_uptime;
3695         s->expire = time_uptime;
3696
3697         if (sn != NULL)
3698                 s->src_node = sn;
3699         if (nsn != NULL) {
3700                 /* XXX We only modify one side for now. */
3701                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
3702                 s->nat_src_node = nsn;
3703         }
3704         if (pd->proto == IPPROTO_TCP) {
3705                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
3706                     off, pd, th, &s->src, &s->dst)) {
3707                         REASON_SET(&reason, PFRES_MEMORY);
3708                         pf_src_tree_remove_state(s);
3709                         STATE_DEC_COUNTERS(s);
3710                         uma_zfree(V_pf_state_z, s);
3711                         return (PF_DROP);
3712                 }
3713                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
3714                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
3715                     &s->src, &s->dst, rewrite)) {
3716                         /* This really shouldn't happen!!! */
3717                         DPFPRINTF(PF_DEBUG_URGENT,
3718                             ("pf_normalize_tcp_stateful failed on first pkt"));
3719                         pf_normalize_tcp_cleanup(s);
3720                         pf_src_tree_remove_state(s);
3721                         STATE_DEC_COUNTERS(s);
3722                         uma_zfree(V_pf_state_z, s);
3723                         return (PF_DROP);
3724                 }
3725         }
3726         s->direction = pd->dir;
3727
3728         /*
3729          * sk/nk could already been setup by pf_get_translation().
3730          */
3731         if (nr == NULL) {
3732                 KASSERT((sk == NULL && nk == NULL), ("%s: nr %p sk %p, nk %p",
3733                     __func__, nr, sk, nk));
3734                 sk = pf_state_key_setup(pd, pd->src, pd->dst, sport, dport);
3735                 if (sk == NULL)
3736                         goto csfailed;
3737                 nk = sk;
3738         } else
3739                 KASSERT((sk != NULL && nk != NULL), ("%s: nr %p sk %p, nk %p",
3740                     __func__, nr, sk, nk));
3741
3742         /* Swap sk/nk for PF_OUT. */
3743         if (pf_state_insert(BOUND_IFACE(r, kif),
3744             (pd->dir == PF_IN) ? sk : nk,
3745             (pd->dir == PF_IN) ? nk : sk, s)) {
3746                 if (pd->proto == IPPROTO_TCP)
3747                         pf_normalize_tcp_cleanup(s);
3748                 REASON_SET(&reason, PFRES_STATEINS);
3749                 pf_src_tree_remove_state(s);
3750                 STATE_DEC_COUNTERS(s);
3751                 uma_zfree(V_pf_state_z, s);
3752                 return (PF_DROP);
3753         } else
3754                 *sm = s;
3755
3756         if (tag > 0)
3757                 s->tag = tag;
3758         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
3759             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
3760                 s->src.state = PF_TCPS_PROXY_SRC;
3761                 /* undo NAT changes, if they have taken place */
3762                 if (nr != NULL) {
3763                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
3764                         if (pd->dir == PF_OUT)
3765                                 skt = s->key[PF_SK_STACK];
3766                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
3767                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
3768                         if (pd->sport)
3769                                 *pd->sport = skt->port[pd->sidx];
3770                         if (pd->dport)
3771                                 *pd->dport = skt->port[pd->didx];
3772                         if (pd->proto_sum)
3773                                 *pd->proto_sum = bproto_sum;
3774                         if (pd->ip_sum)
3775                                 *pd->ip_sum = bip_sum;
3776                         m_copyback(m, off, hdrlen, pd->hdr.any);
3777                 }
3778                 s->src.seqhi = htonl(arc4random());
3779                 /* Find mss option */
3780                 int rtid = M_GETFIB(m);
3781                 mss = pf_get_mss(m, off, th->th_off, pd->af);
3782                 mss = pf_calc_mss(pd->src, pd->af, rtid, mss);
3783                 mss = pf_calc_mss(pd->dst, pd->af, rtid, mss);
3784                 s->src.mss = mss;
3785                 pf_send_tcp(NULL, r, pd->af, pd->dst, pd->src, th->th_dport,
3786                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
3787                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL);
3788                 REASON_SET(&reason, PFRES_SYNPROXY);
3789                 return (PF_SYNPROXY_DROP);
3790         }
3791
3792         return (PF_PASS);
3793
3794 csfailed:
3795         if (sk != NULL)
3796                 uma_zfree(V_pf_state_key_z, sk);
3797         if (nk != NULL)
3798                 uma_zfree(V_pf_state_key_z, nk);
3799
3800         if (sn != NULL) {
3801                 struct pf_srchash *sh;
3802
3803                 sh = &V_pf_srchash[pf_hashsrc(&sn->addr, sn->af)];
3804                 PF_HASHROW_LOCK(sh);
3805                 if (--sn->states == 0 && sn->expire == 0) {
3806                         pf_unlink_src_node(sn);
3807                         uma_zfree(V_pf_sources_z, sn);
3808                         counter_u64_add(
3809                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3810                 }
3811                 PF_HASHROW_UNLOCK(sh);
3812         }
3813
3814         if (nsn != sn && nsn != NULL) {
3815                 struct pf_srchash *sh;
3816
3817                 sh = &V_pf_srchash[pf_hashsrc(&nsn->addr, nsn->af)];
3818                 PF_HASHROW_LOCK(sh);
3819                 if (--nsn->states == 0 && nsn->expire == 0) {
3820                         pf_unlink_src_node(nsn);
3821                         uma_zfree(V_pf_sources_z, nsn);
3822                         counter_u64_add(
3823                             V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
3824                 }
3825                 PF_HASHROW_UNLOCK(sh);
3826         }
3827
3828         return (PF_DROP);
3829 }
3830
3831 static int
3832 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
3833     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
3834     struct pf_ruleset **rsm)
3835 {
3836         struct pf_rule          *r, *a = NULL;
3837         struct pf_ruleset       *ruleset = NULL;
3838         sa_family_t              af = pd->af;
3839         u_short                  reason;
3840         int                      tag = -1;
3841         int                      asd = 0;
3842         int                      match = 0;
3843         struct pf_anchor_stackframe     anchor_stack[PF_ANCHOR_STACKSIZE];
3844
3845         PF_RULES_RASSERT();
3846
3847         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
3848         while (r != NULL) {
3849                 r->evaluations++;
3850                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
3851                         r = r->skip[PF_SKIP_IFP].ptr;
3852                 else if (r->direction && r->direction != direction)
3853                         r = r->skip[PF_SKIP_DIR].ptr;
3854                 else if (r->af && r->af != af)
3855                         r = r->skip[PF_SKIP_AF].ptr;
3856                 else if (r->proto && r->proto != pd->proto)
3857                         r = r->skip[PF_SKIP_PROTO].ptr;
3858                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
3859                     r->src.neg, kif, M_GETFIB(m)))
3860                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
3861                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
3862                     r->dst.neg, NULL, M_GETFIB(m)))
3863                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
3864                 else if (r->tos && !(r->tos == pd->tos))
3865                         r = TAILQ_NEXT(r, entries);
3866                 else if (r->os_fingerprint != PF_OSFP_ANY)
3867                         r = TAILQ_NEXT(r, entries);
3868                 else if (pd->proto == IPPROTO_UDP &&
3869                     (r->src.port_op || r->dst.port_op))
3870                         r = TAILQ_NEXT(r, entries);
3871                 else if (pd->proto == IPPROTO_TCP &&
3872                     (r->src.port_op || r->dst.port_op || r->flagset))
3873                         r = TAILQ_NEXT(r, entries);
3874                 else if ((pd->proto == IPPROTO_ICMP ||
3875                     pd->proto == IPPROTO_ICMPV6) &&
3876                     (r->type || r->code))
3877                         r = TAILQ_NEXT(r, entries);
3878                 else if (r->prio &&
3879                     !pf_match_ieee8021q_pcp(r->prio, m))
3880                         r = TAILQ_NEXT(r, entries);
3881                 else if (r->prob && r->prob <=
3882                     (arc4random() % (UINT_MAX - 1) + 1))
3883                         r = TAILQ_NEXT(r, entries);
3884                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
3885                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
3886                         r = TAILQ_NEXT(r, entries);
3887                 else {
3888                         if (r->anchor == NULL) {
3889                                 match = 1;
3890                                 *rm = r;
3891                                 *am = a;
3892                                 *rsm = ruleset;
3893                                 if ((*rm)->quick)
3894                                         break;
3895                                 r = TAILQ_NEXT(r, entries);
3896                         } else
3897                                 pf_step_into_anchor(anchor_stack, &asd,
3898                                     &ruleset, PF_RULESET_FILTER, &r, &a,
3899                                     &match);
3900                 }
3901                 if (r == NULL && pf_step_out_of_anchor(anchor_stack, &asd,
3902                     &ruleset, PF_RULESET_FILTER, &r, &a, &match))
3903                         break;
3904         }
3905         r = *rm;
3906         a = *am;
3907         ruleset = *rsm;
3908
3909         REASON_SET(&reason, PFRES_MATCH);
3910
3911         if (r->log)
3912                 PFLOG_PACKET(kif, m, af, direction, reason, r, a, ruleset, pd,
3913                     1);
3914
3915         if (r->action != PF_PASS)
3916                 return (PF_DROP);
3917
3918         if (tag > 0 && pf_tag_packet(m, pd, tag)) {
3919                 REASON_SET(&reason, PFRES_MEMORY);
3920                 return (PF_DROP);
3921         }
3922
3923         return (PF_PASS);
3924 }
3925
3926 static int
3927 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
3928         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
3929         struct pf_pdesc *pd, u_short *reason, int *copyback)
3930 {
3931         struct tcphdr           *th = pd->hdr.tcp;
3932         u_int16_t                win = ntohs(th->th_win);
3933         u_int32_t                ack, end, seq, orig_seq;
3934         u_int8_t                 sws, dws;
3935         int                      ackskew;
3936
3937         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
3938                 sws = src->wscale & PF_WSCALE_MASK;
3939                 dws = dst->wscale & PF_WSCALE_MASK;
3940         } else
3941                 sws = dws = 0;
3942
3943         /*
3944          * Sequence tracking algorithm from Guido van Rooij's paper:
3945          *   http://www.madison-gurkha.com/publications/tcp_filtering/
3946          *      tcp_filtering.ps
3947          */
3948
3949         orig_seq = seq = ntohl(th->th_seq);
3950         if (src->seqlo == 0) {
3951                 /* First packet from this end. Set its state */
3952
3953                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
3954                     src->scrub == NULL) {
3955                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
3956                                 REASON_SET(reason, PFRES_MEMORY);
3957                                 return (PF_DROP);
3958                         }
3959                 }
3960
3961                 /* Deferred generation of sequence number modulator */
3962                 if (dst->seqdiff && !src->seqdiff) {
3963                         /* use random iss for the TCP server */
3964                         while ((src->seqdiff = arc4random() - seq) == 0)
3965                                 ;
3966                         ack = ntohl(th->th_ack) - dst->seqdiff;
3967                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
3968                             src->seqdiff), 0);
3969                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
3970                         *copyback = 1;
3971                 } else {
3972                         ack = ntohl(th->th_ack);
3973                 }
3974
3975                 end = seq + pd->p_len;
3976                 if (th->th_flags & TH_SYN) {
3977                         end++;
3978                         if (dst->wscale & PF_WSCALE_FLAG) {
3979                                 src->wscale = pf_get_wscale(m, off, th->th_off,
3980                                     pd->af);
3981                                 if (src->wscale & PF_WSCALE_FLAG) {
3982                                         /* Remove scale factor from initial
3983                                          * window */
3984                                         sws = src->wscale & PF_WSCALE_MASK;
3985                                         win = ((u_int32_t)win + (1 << sws) - 1)
3986                                             >> sws;
3987                                         dws = dst->wscale & PF_WSCALE_MASK;
3988                                 } else {
3989                                         /* fixup other window */
3990                                         dst->max_win <<= dst->wscale &
3991                                             PF_WSCALE_MASK;
3992                                         /* in case of a retrans SYN|ACK */
3993                                         dst->wscale = 0;
3994                                 }
3995                         }
3996                 }
3997                 if (th->th_flags & TH_FIN)
3998                         end++;
3999
4000                 src->seqlo = seq;
4001                 if (src->state < TCPS_SYN_SENT)
4002                         src->state = TCPS_SYN_SENT;
4003
4004                 /*
4005                  * May need to slide the window (seqhi may have been set by
4006                  * the crappy stack check or if we picked up the connection
4007                  * after establishment)
4008                  */
4009                 if (src->seqhi == 1 ||
4010                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
4011                         src->seqhi = end + MAX(1, dst->max_win << dws);
4012                 if (win > src->max_win)
4013                         src->max_win = win;
4014
4015         } else {
4016                 ack = ntohl(th->th_ack) - dst->seqdiff;
4017                 if (src->seqdiff) {
4018                         /* Modulate sequence numbers */
4019                         pf_change_proto_a(m, &th->th_seq, &th->th_sum, htonl(seq +
4020                             src->seqdiff), 0);
4021                         pf_change_proto_a(m, &th->th_ack, &th->th_sum, htonl(ack), 0);
4022                         *copyback = 1;
4023                 }
4024                 end = seq + pd->p_len;
4025                 if (th->th_flags & TH_SYN)
4026                         end++;
4027                 if (th->th_flags & TH_FIN)
4028                         end++;
4029         }
4030
4031         if ((th->th_flags & TH_ACK) == 0) {
4032                 /* Let it pass through the ack skew check */
4033                 ack = dst->seqlo;
4034         } else if ((ack == 0 &&
4035             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
4036             /* broken tcp stacks do not set ack */
4037             (dst->state < TCPS_SYN_SENT)) {
4038                 /*
4039                  * Many stacks (ours included) will set the ACK number in an
4040                  * FIN|ACK if the SYN times out -- no sequence to ACK.
4041                  */
4042                 ack = dst->seqlo;
4043         }
4044
4045         if (seq == end) {
4046                 /* Ease sequencing restrictions on no data packets */
4047                 seq = src->seqlo;
4048                 end = seq;
4049         }
4050
4051         ackskew = dst->seqlo - ack;
4052
4053
4054         /*
4055          * Need to demodulate the sequence numbers in any TCP SACK options
4056          * (Selective ACK). We could optionally validate the SACK values
4057          * against the current ACK window, either forwards or backwards, but
4058          * I'm not confident that SACK has been implemented properly
4059          * everywhere. It wouldn't surprise me if several stacks accidentally
4060          * SACK too far backwards of previously ACKed data. There really aren't
4061          * any security implications of bad SACKing unless the target stack
4062          * doesn't validate the option length correctly. Someone trying to
4063          * spoof into a TCP connection won't bother blindly sending SACK
4064          * options anyway.
4065          */
4066         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
4067                 if (pf_modulate_sack(m, off, pd, th, dst))
4068                         *copyback = 1;
4069         }
4070
4071
4072 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
4073         if (SEQ_GEQ(src->seqhi, end) &&
4074             /* Last octet inside other's window space */
4075             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
4076             /* Retrans: not more than one window back */
4077             (ackskew >= -MAXACKWINDOW) &&
4078             /* Acking not more than one reassembled fragment backwards */
4079             (ackskew <= (MAXACKWINDOW << sws)) &&
4080             /* Acking not more than one window forward */
4081             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
4082             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
4083             (pd->flags & PFDESC_IP_REAS) == 0)) {
4084             /* Require an exact/+1 sequence match on resets when possible */
4085
4086                 if (dst->scrub || src->scrub) {
4087                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4088                             *state, src, dst, copyback))
4089                                 return (PF_DROP);
4090                 }
4091
4092                 /* update max window */
4093                 if (src->max_win < win)
4094                         src->max_win = win;
4095                 /* synchronize sequencing */
4096                 if (SEQ_GT(end, src->seqlo))
4097                         src->seqlo = end;
4098                 /* slide the window of what the other end can send */
4099                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4100                         dst->seqhi = ack + MAX((win << sws), 1);
4101
4102
4103                 /* update states */
4104                 if (th->th_flags & TH_SYN)
4105                         if (src->state < TCPS_SYN_SENT)
4106                                 src->state = TCPS_SYN_SENT;
4107                 if (th->th_flags & TH_FIN)
4108                         if (src->state < TCPS_CLOSING)
4109                                 src->state = TCPS_CLOSING;
4110                 if (th->th_flags & TH_ACK) {
4111                         if (dst->state == TCPS_SYN_SENT) {
4112                                 dst->state = TCPS_ESTABLISHED;
4113                                 if (src->state == TCPS_ESTABLISHED &&
4114                                     (*state)->src_node != NULL &&
4115                                     pf_src_connlimit(state)) {
4116                                         REASON_SET(reason, PFRES_SRCLIMIT);
4117                                         return (PF_DROP);
4118                                 }
4119                         } else if (dst->state == TCPS_CLOSING)
4120                                 dst->state = TCPS_FIN_WAIT_2;
4121                 }
4122                 if (th->th_flags & TH_RST)
4123                         src->state = dst->state = TCPS_TIME_WAIT;
4124
4125                 /* update expire time */
4126                 (*state)->expire = time_uptime;
4127                 if (src->state >= TCPS_FIN_WAIT_2 &&
4128                     dst->state >= TCPS_FIN_WAIT_2)
4129                         (*state)->timeout = PFTM_TCP_CLOSED;
4130                 else if (src->state >= TCPS_CLOSING &&
4131                     dst->state >= TCPS_CLOSING)
4132                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
4133                 else if (src->state < TCPS_ESTABLISHED ||
4134                     dst->state < TCPS_ESTABLISHED)
4135                         (*state)->timeout = PFTM_TCP_OPENING;
4136                 else if (src->state >= TCPS_CLOSING ||
4137                     dst->state >= TCPS_CLOSING)
4138                         (*state)->timeout = PFTM_TCP_CLOSING;
4139                 else
4140                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
4141
4142                 /* Fall through to PASS packet */
4143
4144         } else if ((dst->state < TCPS_SYN_SENT ||
4145                 dst->state >= TCPS_FIN_WAIT_2 ||
4146                 src->state >= TCPS_FIN_WAIT_2) &&
4147             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
4148             /* Within a window forward of the originating packet */
4149             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
4150             /* Within a window backward of the originating packet */
4151
4152                 /*
4153                  * This currently handles three situations:
4154                  *  1) Stupid stacks will shotgun SYNs before their peer
4155                  *     replies.
4156                  *  2) When PF catches an already established stream (the
4157                  *     firewall rebooted, the state table was flushed, routes
4158                  *     changed...)
4159                  *  3) Packets get funky immediately after the connection
4160                  *     closes (this should catch Solaris spurious ACK|FINs
4161                  *     that web servers like to spew after a close)
4162                  *
4163                  * This must be a little more careful than the above code
4164                  * since packet floods will also be caught here. We don't
4165                  * update the TTL here to mitigate the damage of a packet
4166                  * flood and so the same code can handle awkward establishment
4167                  * and a loosened connection close.
4168                  * In the establishment case, a correct peer response will
4169                  * validate the connection, go through the normal state code
4170                  * and keep updating the state TTL.
4171                  */
4172
4173                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4174                         printf("pf: loose state match: ");
4175                         pf_print_state(*state);
4176                         pf_print_flags(th->th_flags);
4177                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4178                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
4179                             pd->p_len, ackskew, (unsigned long long)(*state)->packets[0],
4180                             (unsigned long long)(*state)->packets[1],
4181                             pd->dir == PF_IN ? "in" : "out",
4182                             pd->dir == (*state)->direction ? "fwd" : "rev");
4183                 }
4184
4185                 if (dst->scrub || src->scrub) {
4186                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
4187                             *state, src, dst, copyback))
4188                                 return (PF_DROP);
4189                 }
4190
4191                 /* update max window */
4192                 if (src->max_win < win)
4193                         src->max_win = win;
4194                 /* synchronize sequencing */
4195                 if (SEQ_GT(end, src->seqlo))
4196                         src->seqlo = end;
4197                 /* slide the window of what the other end can send */
4198                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
4199                         dst->seqhi = ack + MAX((win << sws), 1);
4200
4201                 /*
4202                  * Cannot set dst->seqhi here since this could be a shotgunned
4203                  * SYN and not an already established connection.
4204                  */
4205
4206                 if (th->th_flags & TH_FIN)
4207                         if (src->state < TCPS_CLOSING)
4208                                 src->state = TCPS_CLOSING;
4209                 if (th->th_flags & TH_RST)
4210                         src->state = dst->state = TCPS_TIME_WAIT;
4211
4212                 /* Fall through to PASS packet */
4213
4214         } else {
4215                 if ((*state)->dst.state == TCPS_SYN_SENT &&
4216                     (*state)->src.state == TCPS_SYN_SENT) {
4217                         /* Send RST for state mismatches during handshake */
4218                         if (!(th->th_flags & TH_RST))
4219                                 pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4220                                     pd->dst, pd->src, th->th_dport,
4221                                     th->th_sport, ntohl(th->th_ack), 0,
4222                                     TH_RST, 0, 0,
4223                                     (*state)->rule.ptr->return_ttl, 1, 0,
4224                                     kif->pfik_ifp);
4225                         src->seqlo = 0;
4226                         src->seqhi = 1;
4227                         src->max_win = 1;
4228                 } else if (V_pf_status.debug >= PF_DEBUG_MISC) {
4229                         printf("pf: BAD state: ");
4230                         pf_print_state(*state);
4231                         pf_print_flags(th->th_flags);
4232                         printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
4233                             "pkts=%llu:%llu dir=%s,%s\n",
4234                             seq, orig_seq, ack, pd->p_len, ackskew,
4235                             (unsigned long long)(*state)->packets[0],
4236                             (unsigned long long)(*state)->packets[1],
4237                             pd->dir == PF_IN ? "in" : "out",
4238                             pd->dir == (*state)->direction ? "fwd" : "rev");
4239                         printf("pf: State failure on: %c %c %c %c | %c %c\n",
4240                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
4241                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
4242                             ' ': '2',
4243                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
4244                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
4245                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
4246                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
4247                 }
4248                 REASON_SET(reason, PFRES_BADSTATE);
4249                 return (PF_DROP);
4250         }
4251
4252         return (PF_PASS);
4253 }
4254
4255 static int
4256 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
4257         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
4258 {
4259         struct tcphdr           *th = pd->hdr.tcp;
4260
4261         if (th->th_flags & TH_SYN)
4262                 if (src->state < TCPS_SYN_SENT)
4263                         src->state = TCPS_SYN_SENT;
4264         if (th->th_flags & TH_FIN)
4265                 if (src->state < TCPS_CLOSING)
4266                         src->state = TCPS_CLOSING;
4267         if (th->th_flags & TH_ACK) {
4268                 if (dst->state == TCPS_SYN_SENT) {
4269                         dst->state = TCPS_ESTABLISHED;
4270                         if (src->state == TCPS_ESTABLISHED &&
4271                             (*state)->src_node != NULL &&
4272                             pf_src_connlimit(state)) {
4273                                 REASON_SET(reason, PFRES_SRCLIMIT);
4274                                 return (PF_DROP);
4275                         }
4276                 } else if (dst->state == TCPS_CLOSING) {
4277                         dst->state = TCPS_FIN_WAIT_2;
4278                 } else if (src->state == TCPS_SYN_SENT &&
4279                     dst->state < TCPS_SYN_SENT) {
4280                         /*
4281                          * Handle a special sloppy case where we only see one
4282                          * half of the connection. If there is a ACK after
4283                          * the initial SYN without ever seeing a packet from
4284                          * the destination, set the connection to established.
4285                          */
4286                         dst->state = src->state = TCPS_ESTABLISHED;
4287                         if ((*state)->src_node != NULL &&
4288                             pf_src_connlimit(state)) {
4289                                 REASON_SET(reason, PFRES_SRCLIMIT);
4290                                 return (PF_DROP);
4291                         }
4292                 } else if (src->state == TCPS_CLOSING &&
4293                     dst->state == TCPS_ESTABLISHED &&
4294                     dst->seqlo == 0) {
4295                         /*
4296                          * Handle the closing of half connections where we
4297                          * don't see the full bidirectional FIN/ACK+ACK
4298                          * handshake.
4299                          */
4300                         dst->state = TCPS_CLOSING;
4301                 }
4302         }
4303         if (th->th_flags & TH_RST)
4304                 src->state = dst->state = TCPS_TIME_WAIT;
4305
4306         /* update expire time */
4307         (*state)->expire = time_uptime;
4308         if (src->state >= TCPS_FIN_WAIT_2 &&
4309             dst->state >= TCPS_FIN_WAIT_2)
4310                 (*state)->timeout = PFTM_TCP_CLOSED;
4311         else if (src->state >= TCPS_CLOSING &&
4312             dst->state >= TCPS_CLOSING)
4313                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
4314         else if (src->state < TCPS_ESTABLISHED ||
4315             dst->state < TCPS_ESTABLISHED)
4316                 (*state)->timeout = PFTM_TCP_OPENING;
4317         else if (src->state >= TCPS_CLOSING ||
4318             dst->state >= TCPS_CLOSING)
4319                 (*state)->timeout = PFTM_TCP_CLOSING;
4320         else
4321                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
4322
4323         return (PF_PASS);
4324 }
4325
4326 static int
4327 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
4328     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
4329     u_short *reason)
4330 {
4331         struct pf_state_key_cmp  key;
4332         struct tcphdr           *th = pd->hdr.tcp;
4333         int                      copyback = 0;
4334         struct pf_state_peer    *src, *dst;
4335         struct pf_state_key     *sk;
4336
4337         bzero(&key, sizeof(key));
4338         key.af = pd->af;
4339         key.proto = IPPROTO_TCP;
4340         if (direction == PF_IN) {       /* wire side, straight */
4341                 PF_ACPY(&key.addr[0], pd->src, key.af);
4342                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4343                 key.port[0] = th->th_sport;
4344                 key.port[1] = th->th_dport;
4345         } else {                        /* stack side, reverse */
4346                 PF_ACPY(&key.addr[1], pd->src, key.af);
4347                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4348                 key.port[1] = th->th_sport;
4349                 key.port[0] = th->th_dport;
4350         }
4351
4352         STATE_LOOKUP(kif, &key, direction, *state, pd);
4353
4354         if (direction == (*state)->direction) {
4355                 src = &(*state)->src;
4356                 dst = &(*state)->dst;
4357         } else {
4358                 src = &(*state)->dst;
4359                 dst = &(*state)->src;
4360         }
4361
4362         sk = (*state)->key[pd->didx];
4363
4364         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
4365                 if (direction != (*state)->direction) {
4366                         REASON_SET(reason, PFRES_SYNPROXY);
4367                         return (PF_SYNPROXY_DROP);
4368                 }
4369                 if (th->th_flags & TH_SYN) {
4370                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
4371                                 REASON_SET(reason, PFRES_SYNPROXY);
4372                                 return (PF_DROP);
4373                         }
4374                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4375                             pd->src, th->th_dport, th->th_sport,
4376                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
4377                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1, 0, NULL);
4378                         REASON_SET(reason, PFRES_SYNPROXY);
4379                         return (PF_SYNPROXY_DROP);
4380                 } else if (!(th->th_flags & TH_ACK) ||
4381                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4382                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4383                         REASON_SET(reason, PFRES_SYNPROXY);
4384                         return (PF_DROP);
4385                 } else if ((*state)->src_node != NULL &&
4386                     pf_src_connlimit(state)) {
4387                         REASON_SET(reason, PFRES_SRCLIMIT);
4388                         return (PF_DROP);
4389                 } else
4390                         (*state)->src.state = PF_TCPS_PROXY_DST;
4391         }
4392         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
4393                 if (direction == (*state)->direction) {
4394                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
4395                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
4396                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
4397                                 REASON_SET(reason, PFRES_SYNPROXY);
4398                                 return (PF_DROP);
4399                         }
4400                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
4401                         if ((*state)->dst.seqhi == 1)
4402                                 (*state)->dst.seqhi = htonl(arc4random());
4403                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4404                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4405                             sk->port[pd->sidx], sk->port[pd->didx],
4406                             (*state)->dst.seqhi, 0, TH_SYN, 0,
4407                             (*state)->src.mss, 0, 0, (*state)->tag, NULL);
4408                         REASON_SET(reason, PFRES_SYNPROXY);
4409                         return (PF_SYNPROXY_DROP);
4410                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
4411                     (TH_SYN|TH_ACK)) ||
4412                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
4413                         REASON_SET(reason, PFRES_SYNPROXY);
4414                         return (PF_DROP);
4415                 } else {
4416                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
4417                         (*state)->dst.seqlo = ntohl(th->th_seq);
4418                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af, pd->dst,
4419                             pd->src, th->th_dport, th->th_sport,
4420                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
4421                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
4422                             (*state)->tag, NULL);
4423                         pf_send_tcp(NULL, (*state)->rule.ptr, pd->af,
4424                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
4425                             sk->port[pd->sidx], sk->port[pd->didx],
4426                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
4427                             TH_ACK, (*state)->dst.max_win, 0, 0, 1, 0, NULL);
4428                         (*state)->src.seqdiff = (*state)->dst.seqhi -
4429                             (*state)->src.seqlo;
4430                         (*state)->dst.seqdiff = (*state)->src.seqhi -
4431                             (*state)->dst.seqlo;
4432                         (*state)->src.seqhi = (*state)->src.seqlo +
4433                             (*state)->dst.max_win;
4434                         (*state)->dst.seqhi = (*state)->dst.seqlo +
4435                             (*state)->src.max_win;
4436                         (*state)->src.wscale = (*state)->dst.wscale = 0;
4437                         (*state)->src.state = (*state)->dst.state =
4438                             TCPS_ESTABLISHED;
4439                         REASON_SET(reason, PFRES_SYNPROXY);
4440                         return (PF_SYNPROXY_DROP);
4441                 }
4442         }
4443
4444         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
4445             dst->state >= TCPS_FIN_WAIT_2 &&
4446             src->state >= TCPS_FIN_WAIT_2) {
4447                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4448                         printf("pf: state reuse ");
4449                         pf_print_state(*state);
4450                         pf_print_flags(th->th_flags);
4451                         printf("\n");
4452                 }
4453                 /* XXX make sure it's the same direction ?? */
4454                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
4455                 pf_unlink_state(*state, PF_ENTER_LOCKED);
4456                 *state = NULL;
4457                 return (PF_DROP);
4458         }
4459
4460         if ((*state)->state_flags & PFSTATE_SLOPPY) {
4461                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
4462                         return (PF_DROP);
4463         } else {
4464                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
4465                     &copyback) == PF_DROP)
4466                         return (PF_DROP);
4467         }
4468
4469         /* translate source/destination address, if necessary */
4470         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4471                 struct pf_state_key *nk = (*state)->key[pd->didx];
4472
4473                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4474                     nk->port[pd->sidx] != th->th_sport)
4475                         pf_change_ap(m, pd->src, &th->th_sport,
4476                             pd->ip_sum, &th->th_sum, &nk->addr[pd->sidx],
4477                             nk->port[pd->sidx], 0, pd->af);
4478
4479                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4480                     nk->port[pd->didx] != th->th_dport)
4481                         pf_change_ap(m, pd->dst, &th->th_dport,
4482                             pd->ip_sum, &th->th_sum, &nk->addr[pd->didx],
4483                             nk->port[pd->didx], 0, pd->af);
4484                 copyback = 1;
4485         }
4486
4487         /* Copyback sequence modulation or stateful scrub changes if needed */
4488         if (copyback)
4489                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
4490
4491         return (PF_PASS);
4492 }
4493
4494 static int
4495 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
4496     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
4497 {
4498         struct pf_state_peer    *src, *dst;
4499         struct pf_state_key_cmp  key;
4500         struct udphdr           *uh = pd->hdr.udp;
4501
4502         bzero(&key, sizeof(key));
4503         key.af = pd->af;
4504         key.proto = IPPROTO_UDP;
4505         if (direction == PF_IN) {       /* wire side, straight */
4506                 PF_ACPY(&key.addr[0], pd->src, key.af);
4507                 PF_ACPY(&key.addr[1], pd->dst, key.af);
4508                 key.port[0] = uh->uh_sport;
4509                 key.port[1] = uh->uh_dport;
4510         } else {                        /* stack side, reverse */
4511                 PF_ACPY(&key.addr[1], pd->src, key.af);
4512                 PF_ACPY(&key.addr[0], pd->dst, key.af);
4513                 key.port[1] = uh->uh_sport;
4514                 key.port[0] = uh->uh_dport;
4515         }
4516
4517         STATE_LOOKUP(kif, &key, direction, *state, pd);
4518
4519         if (direction == (*state)->direction) {
4520                 src = &(*state)->src;
4521                 dst = &(*state)->dst;
4522         } else {
4523                 src = &(*state)->dst;
4524                 dst = &(*state)->src;
4525         }
4526
4527         /* update states */
4528         if (src->state < PFUDPS_SINGLE)
4529                 src->state = PFUDPS_SINGLE;
4530         if (dst->state == PFUDPS_SINGLE)
4531                 dst->state = PFUDPS_MULTIPLE;
4532
4533         /* update expire time */
4534         (*state)->expire = time_uptime;
4535         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
4536                 (*state)->timeout = PFTM_UDP_MULTIPLE;
4537         else
4538                 (*state)->timeout = PFTM_UDP_SINGLE;
4539
4540         /* translate source/destination address, if necessary */
4541         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4542                 struct pf_state_key *nk = (*state)->key[pd->didx];
4543
4544                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
4545                     nk->port[pd->sidx] != uh->uh_sport)
4546                         pf_change_ap(m, pd->src, &uh->uh_sport, pd->ip_sum,
4547                             &uh->uh_sum, &nk->addr[pd->sidx],
4548                             nk->port[pd->sidx], 1, pd->af);
4549
4550                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
4551                     nk->port[pd->didx] != uh->uh_dport)
4552                         pf_change_ap(m, pd->dst, &uh->uh_dport, pd->ip_sum,
4553                             &uh->uh_sum, &nk->addr[pd->didx],
4554                             nk->port[pd->didx], 1, pd->af);
4555                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
4556         }
4557
4558         return (PF_PASS);
4559 }
4560
4561 static int
4562 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
4563     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
4564 {
4565         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
4566         u_int16_t        icmpid = 0, *icmpsum;
4567         u_int8_t         icmptype;
4568         int              state_icmp = 0;
4569         struct pf_state_key_cmp key;
4570
4571         bzero(&key, sizeof(key));
4572         switch (pd->proto) {
4573 #ifdef INET
4574         case IPPROTO_ICMP:
4575                 icmptype = pd->hdr.icmp->icmp_type;
4576                 icmpid = pd->hdr.icmp->icmp_id;
4577                 icmpsum = &pd->hdr.icmp->icmp_cksum;
4578
4579                 if (icmptype == ICMP_UNREACH ||
4580                     icmptype == ICMP_SOURCEQUENCH ||
4581                     icmptype == ICMP_REDIRECT ||
4582                     icmptype == ICMP_TIMXCEED ||
4583                     icmptype == ICMP_PARAMPROB)
4584                         state_icmp++;
4585                 break;
4586 #endif /* INET */
4587 #ifdef INET6
4588         case IPPROTO_ICMPV6:
4589                 icmptype = pd->hdr.icmp6->icmp6_type;
4590                 icmpid = pd->hdr.icmp6->icmp6_id;
4591                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
4592
4593                 if (icmptype == ICMP6_DST_UNREACH ||
4594                     icmptype == ICMP6_PACKET_TOO_BIG ||
4595                     icmptype == ICMP6_TIME_EXCEEDED ||
4596                     icmptype == ICMP6_PARAM_PROB)
4597                         state_icmp++;
4598                 break;
4599 #endif /* INET6 */
4600         }
4601
4602         if (!state_icmp) {
4603
4604                 /*
4605                  * ICMP query/reply message not related to a TCP/UDP packet.
4606                  * Search for an ICMP state.
4607                  */
4608                 key.af = pd->af;
4609                 key.proto = pd->proto;
4610                 key.port[0] = key.port[1] = icmpid;
4611                 if (direction == PF_IN) {       /* wire side, straight */
4612                         PF_ACPY(&key.addr[0], pd->src, key.af);
4613                         PF_ACPY(&key.addr[1], pd->dst, key.af);
4614                 } else {                        /* stack side, reverse */
4615                         PF_ACPY(&key.addr[1], pd->src, key.af);
4616                         PF_ACPY(&key.addr[0], pd->dst, key.af);
4617                 }
4618
4619                 STATE_LOOKUP(kif, &key, direction, *state, pd);
4620
4621                 (*state)->expire = time_uptime;
4622                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
4623
4624                 /* translate source/destination address, if necessary */
4625                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
4626                         struct pf_state_key *nk = (*state)->key[pd->didx];
4627
4628                         switch (pd->af) {
4629 #ifdef INET
4630                         case AF_INET:
4631                                 if (PF_ANEQ(pd->src,
4632                                     &nk->addr[pd->sidx], AF_INET))
4633                                         pf_change_a(&saddr->v4.s_addr,
4634                                             pd->ip_sum,
4635                                             nk->addr[pd->sidx].v4.s_addr, 0);
4636
4637                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
4638                                     AF_INET))
4639                                         pf_change_a(&daddr->v4.s_addr,
4640                                             pd->ip_sum,
4641                                             nk->addr[pd->didx].v4.s_addr, 0);
4642
4643                                 if (nk->port[0] !=
4644                                     pd->hdr.icmp->icmp_id) {
4645                                         pd->hdr.icmp->icmp_cksum =
4646                                             pf_cksum_fixup(
4647                                             pd->hdr.icmp->icmp_cksum, icmpid,
4648                                             nk->port[pd->sidx], 0);
4649                                         pd->hdr.icmp->icmp_id =
4650                                             nk->port[pd->sidx];
4651                                 }
4652
4653                                 m_copyback(m, off, ICMP_MINLEN,
4654                                     (caddr_t )pd->hdr.icmp);
4655                                 break;
4656 #endif /* INET */
4657 #ifdef INET6
4658                         case AF_INET6:
4659                                 if (PF_ANEQ(pd->src,
4660                                     &nk->addr[pd->sidx], AF_INET6))
4661                                         pf_change_a6(saddr,
4662                                             &pd->hdr.icmp6->icmp6_cksum,
4663                                             &nk->addr[pd->sidx], 0);
4664
4665                                 if (PF_ANEQ(pd->dst,
4666                                     &nk->addr[pd->didx], AF_INET6))
4667                                         pf_change_a6(daddr,
4668                                             &pd->hdr.icmp6->icmp6_cksum,
4669                                             &nk->addr[pd->didx], 0);
4670
4671                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
4672                                     (caddr_t )pd->hdr.icmp6);
4673                                 break;
4674 #endif /* INET6 */
4675                         }
4676                 }
4677                 return (PF_PASS);
4678
4679         } else {
4680                 /*
4681                  * ICMP error message in response to a TCP/UDP packet.
4682                  * Extract the inner TCP/UDP header and search for that state.
4683                  */
4684
4685                 struct pf_pdesc pd2;
4686                 bzero(&pd2, sizeof pd2);
4687 #ifdef INET
4688                 struct ip       h2;
4689 #endif /* INET */
4690 #ifdef INET6
4691                 struct ip6_hdr  h2_6;
4692                 int             terminal = 0;
4693 #endif /* INET6 */
4694                 int             ipoff2 = 0;
4695                 int             off2 = 0;
4696
4697                 pd2.af = pd->af;
4698                 /* Payload packet is from the opposite direction. */
4699                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
4700                 pd2.didx = (direction == PF_IN) ? 0 : 1;
4701                 switch (pd->af) {
4702 #ifdef INET
4703                 case AF_INET:
4704                         /* offset of h2 in mbuf chain */
4705                         ipoff2 = off + ICMP_MINLEN;
4706
4707                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
4708                             NULL, reason, pd2.af)) {
4709                                 DPFPRINTF(PF_DEBUG_MISC,
4710                                     ("pf: ICMP error message too short "
4711                                     "(ip)\n"));
4712                                 return (PF_DROP);
4713                         }
4714                         /*
4715                          * ICMP error messages don't refer to non-first
4716                          * fragments
4717                          */
4718                         if (h2.ip_off & htons(IP_OFFMASK)) {
4719                                 REASON_SET(reason, PFRES_FRAG);
4720                                 return (PF_DROP);
4721                         }
4722
4723                         /* offset of protocol header that follows h2 */
4724                         off2 = ipoff2 + (h2.ip_hl << 2);
4725
4726                         pd2.proto = h2.ip_p;
4727                         pd2.src = (struct pf_addr *)&h2.ip_src;
4728                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
4729                         pd2.ip_sum = &h2.ip_sum;
4730                         break;
4731 #endif /* INET */
4732 #ifdef INET6
4733                 case AF_INET6:
4734                         ipoff2 = off + sizeof(struct icmp6_hdr);
4735
4736                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
4737                             NULL, reason, pd2.af)) {
4738                                 DPFPRINTF(PF_DEBUG_MISC,
4739                                     ("pf: ICMP error message too short "
4740                                     "(ip6)\n"));
4741                                 return (PF_DROP);
4742                         }
4743                         pd2.proto = h2_6.ip6_nxt;
4744                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
4745                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
4746                         pd2.ip_sum = NULL;
4747                         off2 = ipoff2 + sizeof(h2_6);
4748                         do {
4749                                 switch (pd2.proto) {
4750                                 case IPPROTO_FRAGMENT:
4751                                         /*
4752                                          * ICMPv6 error messages for
4753                                          * non-first fragments
4754                                          */
4755                                         REASON_SET(reason, PFRES_FRAG);
4756                                         return (PF_DROP);
4757                                 case IPPROTO_AH:
4758                                 case IPPROTO_HOPOPTS:
4759                                 case IPPROTO_ROUTING:
4760                                 case IPPROTO_DSTOPTS: {
4761                                         /* get next header and header length */
4762                                         struct ip6_ext opt6;
4763
4764                                         if (!pf_pull_hdr(m, off2, &opt6,
4765                                             sizeof(opt6), NULL, reason,
4766                                             pd2.af)) {
4767                                                 DPFPRINTF(PF_DEBUG_MISC,
4768                                                     ("pf: ICMPv6 short opt\n"));
4769                                                 return (PF_DROP);
4770                                         }
4771                                         if (pd2.proto == IPPROTO_AH)
4772                                                 off2 += (opt6.ip6e_len + 2) * 4;
4773                                         else
4774                                                 off2 += (opt6.ip6e_len + 1) * 8;
4775                                         pd2.proto = opt6.ip6e_nxt;
4776                                         /* goto the next header */
4777                                         break;
4778                                 }
4779                                 default:
4780                                         terminal++;
4781                                         break;
4782                                 }
4783                         } while (!terminal);
4784                         break;
4785 #endif /* INET6 */
4786                 }
4787
4788                 switch (pd2.proto) {
4789                 case IPPROTO_TCP: {
4790                         struct tcphdr            th;
4791                         u_int32_t                seq;
4792                         struct pf_state_peer    *src, *dst;
4793                         u_int8_t                 dws;
4794                         int                      copyback = 0;
4795
4796                         /*
4797                          * Only the first 8 bytes of the TCP header can be
4798                          * expected. Don't access any TCP header fields after
4799                          * th_seq, an ackskew test is not possible.
4800                          */
4801                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
4802                             pd2.af)) {
4803                                 DPFPRINTF(PF_DEBUG_MISC,
4804                                     ("pf: ICMP error message too short "
4805                                     "(tcp)\n"));
4806                                 return (PF_DROP);
4807                         }
4808
4809                         key.af = pd2.af;
4810                         key.proto = IPPROTO_TCP;
4811                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4812                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4813                         key.port[pd2.sidx] = th.th_sport;
4814                         key.port[pd2.didx] = th.th_dport;
4815
4816                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4817
4818                         if (direction == (*state)->direction) {
4819                                 src = &(*state)->dst;
4820                                 dst = &(*state)->src;
4821                         } else {
4822                                 src = &(*state)->src;
4823                                 dst = &(*state)->dst;
4824                         }
4825
4826                         if (src->wscale && dst->wscale)
4827                                 dws = dst->wscale & PF_WSCALE_MASK;
4828                         else
4829                                 dws = 0;
4830
4831                         /* Demodulate sequence number */
4832                         seq = ntohl(th.th_seq) - src->seqdiff;
4833                         if (src->seqdiff) {
4834                                 pf_change_a(&th.th_seq, icmpsum,
4835                                     htonl(seq), 0);
4836                                 copyback = 1;
4837                         }
4838
4839                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
4840                             (!SEQ_GEQ(src->seqhi, seq) ||
4841                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
4842                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4843                                         printf("pf: BAD ICMP %d:%d ",
4844                                             icmptype, pd->hdr.icmp->icmp_code);
4845                                         pf_print_host(pd->src, 0, pd->af);
4846                                         printf(" -> ");
4847                                         pf_print_host(pd->dst, 0, pd->af);
4848                                         printf(" state: ");
4849                                         pf_print_state(*state);
4850                                         printf(" seq=%u\n", seq);
4851                                 }
4852                                 REASON_SET(reason, PFRES_BADSTATE);
4853                                 return (PF_DROP);
4854                         } else {
4855                                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
4856                                         printf("pf: OK ICMP %d:%d ",
4857                                             icmptype, pd->hdr.icmp->icmp_code);
4858                                         pf_print_host(pd->src, 0, pd->af);
4859                                         printf(" -> ");
4860                                         pf_print_host(pd->dst, 0, pd->af);
4861                                         printf(" state: ");
4862                                         pf_print_state(*state);
4863                                         printf(" seq=%u\n", seq);
4864                                 }
4865                         }
4866
4867                         /* translate source/destination address, if necessary */
4868                         if ((*state)->key[PF_SK_WIRE] !=
4869                             (*state)->key[PF_SK_STACK]) {
4870                                 struct pf_state_key *nk =
4871                                     (*state)->key[pd->didx];
4872
4873                                 if (PF_ANEQ(pd2.src,
4874                                     &nk->addr[pd2.sidx], pd2.af) ||
4875                                     nk->port[pd2.sidx] != th.th_sport)
4876                                         pf_change_icmp(pd2.src, &th.th_sport,
4877                                             daddr, &nk->addr[pd2.sidx],
4878                                             nk->port[pd2.sidx], NULL,
4879                                             pd2.ip_sum, icmpsum,
4880                                             pd->ip_sum, 0, pd2.af);
4881
4882                                 if (PF_ANEQ(pd2.dst,
4883                                     &nk->addr[pd2.didx], pd2.af) ||
4884                                     nk->port[pd2.didx] != th.th_dport)
4885                                         pf_change_icmp(pd2.dst, &th.th_dport,
4886                                             saddr, &nk->addr[pd2.didx],
4887                                             nk->port[pd2.didx], NULL,
4888                                             pd2.ip_sum, icmpsum,
4889                                             pd->ip_sum, 0, pd2.af);
4890                                 copyback = 1;
4891                         }
4892
4893                         if (copyback) {
4894                                 switch (pd2.af) {
4895 #ifdef INET
4896                                 case AF_INET:
4897                                         m_copyback(m, off, ICMP_MINLEN,
4898                                             (caddr_t )pd->hdr.icmp);
4899                                         m_copyback(m, ipoff2, sizeof(h2),
4900                                             (caddr_t )&h2);
4901                                         break;
4902 #endif /* INET */
4903 #ifdef INET6
4904                                 case AF_INET6:
4905                                         m_copyback(m, off,
4906                                             sizeof(struct icmp6_hdr),
4907                                             (caddr_t )pd->hdr.icmp6);
4908                                         m_copyback(m, ipoff2, sizeof(h2_6),
4909                                             (caddr_t )&h2_6);
4910                                         break;
4911 #endif /* INET6 */
4912                                 }
4913                                 m_copyback(m, off2, 8, (caddr_t)&th);
4914                         }
4915
4916                         return (PF_PASS);
4917                         break;
4918                 }
4919                 case IPPROTO_UDP: {
4920                         struct udphdr           uh;
4921
4922                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
4923                             NULL, reason, pd2.af)) {
4924                                 DPFPRINTF(PF_DEBUG_MISC,
4925                                     ("pf: ICMP error message too short "
4926                                     "(udp)\n"));
4927                                 return (PF_DROP);
4928                         }
4929
4930                         key.af = pd2.af;
4931                         key.proto = IPPROTO_UDP;
4932                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
4933                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
4934                         key.port[pd2.sidx] = uh.uh_sport;
4935                         key.port[pd2.didx] = uh.uh_dport;
4936
4937                         STATE_LOOKUP(kif, &key, direction, *state, pd);
4938
4939                         /* translate source/destination address, if necessary */
4940                         if ((*state)->key[PF_SK_WIRE] !=
4941                             (*state)->key[PF_SK_STACK]) {
4942                                 struct pf_state_key *nk =
4943                                     (*state)->key[pd->didx];
4944
4945                                 if (PF_ANEQ(pd2.src,
4946                                     &nk->addr[pd2.sidx], pd2.af) ||
4947                                     nk->port[pd2.sidx] != uh.uh_sport)
4948                                         pf_change_icmp(pd2.src, &uh.uh_sport,
4949                                             daddr, &nk->addr[pd2.sidx],
4950                                             nk->port[pd2.sidx], &uh.uh_sum,
4951                                             pd2.ip_sum, icmpsum,
4952                                             pd->ip_sum, 1, pd2.af);
4953
4954                                 if (PF_ANEQ(pd2.dst,
4955                                     &nk->addr[pd2.didx], pd2.af) ||
4956                                     nk->port[pd2.didx] != uh.uh_dport)
4957                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
4958                                             saddr, &nk->addr[pd2.didx],
4959                                             nk->port[pd2.didx], &uh.uh_sum,
4960                                             pd2.ip_sum, icmpsum,
4961                                             pd->ip_sum, 1, pd2.af);
4962
4963                                 switch (pd2.af) {
4964 #ifdef INET
4965                                 case AF_INET:
4966                                         m_copyback(m, off, ICMP_MINLEN,
4967                                             (caddr_t )pd->hdr.icmp);
4968                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
4969                                         break;
4970 #endif /* INET */
4971 #ifdef INET6
4972                                 case AF_INET6:
4973                                         m_copyback(m, off,
4974                                             sizeof(struct icmp6_hdr),
4975                                             (caddr_t )pd->hdr.icmp6);
4976                                         m_copyback(m, ipoff2, sizeof(h2_6),
4977                                             (caddr_t )&h2_6);
4978                                         break;
4979 #endif /* INET6 */
4980                                 }
4981                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
4982                         }
4983                         return (PF_PASS);
4984                         break;
4985                 }
4986 #ifdef INET
4987                 case IPPROTO_ICMP: {
4988                         struct icmp             iih;
4989
4990                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
4991                             NULL, reason, pd2.af)) {
4992                                 DPFPRINTF(PF_DEBUG_MISC,
4993                                     ("pf: ICMP error message too short i"
4994                                     "(icmp)\n"));
4995                                 return (PF_DROP);
4996                         }
4997
4998                         key.af = pd2.af;
4999                         key.proto = IPPROTO_ICMP;
5000                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5001                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5002                         key.port[0] = key.port[1] = iih.icmp_id;
5003
5004                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5005
5006                         /* translate source/destination address, if necessary */
5007                         if ((*state)->key[PF_SK_WIRE] !=
5008                             (*state)->key[PF_SK_STACK]) {
5009                                 struct pf_state_key *nk =
5010                                     (*state)->key[pd->didx];
5011
5012                                 if (PF_ANEQ(pd2.src,
5013                                     &nk->addr[pd2.sidx], pd2.af) ||
5014                                     nk->port[pd2.sidx] != iih.icmp_id)
5015                                         pf_change_icmp(pd2.src, &iih.icmp_id,
5016                                             daddr, &nk->addr[pd2.sidx],
5017                                             nk->port[pd2.sidx], NULL,
5018                                             pd2.ip_sum, icmpsum,
5019                                             pd->ip_sum, 0, AF_INET);
5020
5021                                 if (PF_ANEQ(pd2.dst,
5022                                     &nk->addr[pd2.didx], pd2.af) ||
5023                                     nk->port[pd2.didx] != iih.icmp_id)
5024                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
5025                                             saddr, &nk->addr[pd2.didx],
5026                                             nk->port[pd2.didx], NULL,
5027                                             pd2.ip_sum, icmpsum,
5028                                             pd->ip_sum, 0, AF_INET);
5029
5030                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
5031                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5032                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
5033                         }
5034                         return (PF_PASS);
5035                         break;
5036                 }
5037 #endif /* INET */
5038 #ifdef INET6
5039                 case IPPROTO_ICMPV6: {
5040                         struct icmp6_hdr        iih;
5041
5042                         if (!pf_pull_hdr(m, off2, &iih,
5043                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
5044                                 DPFPRINTF(PF_DEBUG_MISC,
5045                                     ("pf: ICMP error message too short "
5046                                     "(icmp6)\n"));
5047                                 return (PF_DROP);
5048                         }
5049
5050                         key.af = pd2.af;
5051                         key.proto = IPPROTO_ICMPV6;
5052                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5053                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5054                         key.port[0] = key.port[1] = iih.icmp6_id;
5055
5056                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5057
5058                         /* translate source/destination address, if necessary */
5059                         if ((*state)->key[PF_SK_WIRE] !=
5060                             (*state)->key[PF_SK_STACK]) {
5061                                 struct pf_state_key *nk =
5062                                     (*state)->key[pd->didx];
5063
5064                                 if (PF_ANEQ(pd2.src,
5065                                     &nk->addr[pd2.sidx], pd2.af) ||
5066                                     nk->port[pd2.sidx] != iih.icmp6_id)
5067                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
5068                                             daddr, &nk->addr[pd2.sidx],
5069                                             nk->port[pd2.sidx], NULL,
5070                                             pd2.ip_sum, icmpsum,
5071                                             pd->ip_sum, 0, AF_INET6);
5072
5073                                 if (PF_ANEQ(pd2.dst,
5074                                     &nk->addr[pd2.didx], pd2.af) ||
5075                                     nk->port[pd2.didx] != iih.icmp6_id)
5076                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
5077                                             saddr, &nk->addr[pd2.didx],
5078                                             nk->port[pd2.didx], NULL,
5079                                             pd2.ip_sum, icmpsum,
5080                                             pd->ip_sum, 0, AF_INET6);
5081
5082                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
5083                                     (caddr_t)pd->hdr.icmp6);
5084                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
5085                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
5086                                     (caddr_t)&iih);
5087                         }
5088                         return (PF_PASS);
5089                         break;
5090                 }
5091 #endif /* INET6 */
5092                 default: {
5093                         key.af = pd2.af;
5094                         key.proto = pd2.proto;
5095                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
5096                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
5097                         key.port[0] = key.port[1] = 0;
5098
5099                         STATE_LOOKUP(kif, &key, direction, *state, pd);
5100
5101                         /* translate source/destination address, if necessary */
5102                         if ((*state)->key[PF_SK_WIRE] !=
5103                             (*state)->key[PF_SK_STACK]) {
5104                                 struct pf_state_key *nk =
5105                                     (*state)->key[pd->didx];
5106
5107                                 if (PF_ANEQ(pd2.src,
5108                                     &nk->addr[pd2.sidx], pd2.af))
5109                                         pf_change_icmp(pd2.src, NULL, daddr,
5110                                             &nk->addr[pd2.sidx], 0, NULL,
5111                                             pd2.ip_sum, icmpsum,
5112                                             pd->ip_sum, 0, pd2.af);
5113
5114                                 if (PF_ANEQ(pd2.dst,
5115                                     &nk->addr[pd2.didx], pd2.af))
5116                                         pf_change_icmp(pd2.dst, NULL, saddr,
5117                                             &nk->addr[pd2.didx], 0, NULL,
5118                                             pd2.ip_sum, icmpsum,
5119                                             pd->ip_sum, 0, pd2.af);
5120
5121                                 switch (pd2.af) {
5122 #ifdef INET
5123                                 case AF_INET:
5124                                         m_copyback(m, off, ICMP_MINLEN,
5125                                             (caddr_t)pd->hdr.icmp);
5126                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
5127                                         break;
5128 #endif /* INET */
5129 #ifdef INET6
5130                                 case AF_INET6:
5131                                         m_copyback(m, off,
5132                                             sizeof(struct icmp6_hdr),
5133                                             (caddr_t )pd->hdr.icmp6);
5134                                         m_copyback(m, ipoff2, sizeof(h2_6),
5135                                             (caddr_t )&h2_6);
5136                                         break;
5137 #endif /* INET6 */
5138                                 }
5139                         }
5140                         return (PF_PASS);
5141                         break;
5142                 }
5143                 }
5144         }
5145 }
5146
5147 static int
5148 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
5149     struct mbuf *m, struct pf_pdesc *pd)
5150 {
5151         struct pf_state_peer    *src, *dst;
5152         struct pf_state_key_cmp  key;
5153
5154         bzero(&key, sizeof(key));
5155         key.af = pd->af;
5156         key.proto = pd->proto;
5157         if (direction == PF_IN) {
5158                 PF_ACPY(&key.addr[0], pd->src, key.af);
5159                 PF_ACPY(&key.addr[1], pd->dst, key.af);
5160                 key.port[0] = key.port[1] = 0;
5161         } else {
5162                 PF_ACPY(&key.addr[1], pd->src, key.af);
5163                 PF_ACPY(&key.addr[0], pd->dst, key.af);
5164                 key.port[1] = key.port[0] = 0;
5165         }
5166
5167         STATE_LOOKUP(kif, &key, direction, *state, pd);
5168
5169         if (direction == (*state)->direction) {
5170                 src = &(*state)->src;
5171                 dst = &(*state)->dst;
5172         } else {
5173                 src = &(*state)->dst;
5174                 dst = &(*state)->src;
5175         }
5176
5177         /* update states */
5178         if (src->state < PFOTHERS_SINGLE)
5179                 src->state = PFOTHERS_SINGLE;
5180         if (dst->state == PFOTHERS_SINGLE)
5181                 dst->state = PFOTHERS_MULTIPLE;
5182
5183         /* update expire time */
5184         (*state)->expire = time_uptime;
5185         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
5186                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
5187         else
5188                 (*state)->timeout = PFTM_OTHER_SINGLE;
5189
5190         /* translate source/destination address, if necessary */
5191         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
5192                 struct pf_state_key *nk = (*state)->key[pd->didx];
5193
5194                 KASSERT(nk, ("%s: nk is null", __func__));
5195                 KASSERT(pd, ("%s: pd is null", __func__));
5196                 KASSERT(pd->src, ("%s: pd->src is null", __func__));
5197                 KASSERT(pd->dst, ("%s: pd->dst is null", __func__));
5198                 switch (pd->af) {
5199 #ifdef INET
5200                 case AF_INET:
5201                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5202                                 pf_change_a(&pd->src->v4.s_addr,
5203                                     pd->ip_sum,
5204                                     nk->addr[pd->sidx].v4.s_addr,
5205                                     0);
5206
5207
5208                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5209                                 pf_change_a(&pd->dst->v4.s_addr,
5210                                     pd->ip_sum,
5211                                     nk->addr[pd->didx].v4.s_addr,
5212                                     0);
5213
5214                                 break;
5215 #endif /* INET */
5216 #ifdef INET6
5217                 case AF_INET6:
5218                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
5219                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
5220
5221                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
5222                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
5223 #endif /* INET6 */
5224                 }
5225         }
5226         return (PF_PASS);
5227 }
5228
5229 /*
5230  * ipoff and off are measured from the start of the mbuf chain.
5231  * h must be at "ipoff" on the mbuf chain.
5232  */
5233 void *
5234 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
5235     u_short *actionp, u_short *reasonp, sa_family_t af)
5236 {
5237         switch (af) {
5238 #ifdef INET
5239         case AF_INET: {
5240                 struct ip       *h = mtod(m, struct ip *);
5241                 u_int16_t        fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
5242
5243                 if (fragoff) {
5244                         if (fragoff >= len)
5245                                 ACTION_SET(actionp, PF_PASS);
5246                         else {
5247                                 ACTION_SET(actionp, PF_DROP);
5248                                 REASON_SET(reasonp, PFRES_FRAG);
5249                         }
5250                         return (NULL);
5251                 }
5252                 if (m->m_pkthdr.len < off + len ||
5253                     ntohs(h->ip_len) < off + len) {
5254                         ACTION_SET(actionp, PF_DROP);
5255                         REASON_SET(reasonp, PFRES_SHORT);
5256                         return (NULL);
5257                 }
5258                 break;
5259         }
5260 #endif /* INET */
5261 #ifdef INET6
5262         case AF_INET6: {
5263                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
5264
5265                 if (m->m_pkthdr.len < off + len ||
5266                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
5267                     (unsigned)(off + len)) {
5268                         ACTION_SET(actionp, PF_DROP);
5269                         REASON_SET(reasonp, PFRES_SHORT);
5270                         return (NULL);
5271                 }
5272                 break;
5273         }
5274 #endif /* INET6 */
5275         }
5276         m_copydata(m, off, len, p);
5277         return (p);
5278 }
5279
5280 #ifdef RADIX_MPATH
5281 static int
5282 pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5283     int rtableid)
5284 {
5285         struct radix_node_head  *rnh;
5286         struct sockaddr_in      *dst;
5287         int                      ret = 1;
5288         int                      check_mpath;
5289 #ifdef INET6
5290         struct sockaddr_in6     *dst6;
5291         struct route_in6         ro;
5292 #else
5293         struct route             ro;
5294 #endif
5295         struct radix_node       *rn;
5296         struct rtentry          *rt;
5297         struct ifnet            *ifp;
5298
5299         check_mpath = 0;
5300         /* XXX: stick to table 0 for now */
5301         rnh = rt_tables_get_rnh(0, af);
5302         if (rnh != NULL && rn_mpath_capable(rnh))
5303                 check_mpath = 1;
5304         bzero(&ro, sizeof(ro));
5305         switch (af) {
5306         case AF_INET:
5307                 dst = satosin(&ro.ro_dst);
5308                 dst->sin_family = AF_INET;
5309                 dst->sin_len = sizeof(*dst);
5310                 dst->sin_addr = addr->v4;
5311                 break;
5312 #ifdef INET6
5313         case AF_INET6:
5314                 /*
5315                  * Skip check for addresses with embedded interface scope,
5316                  * as they would always match anyway.
5317                  */
5318                 if (IN6_IS_SCOPE_EMBED(&addr->v6))
5319                         goto out;
5320                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
5321                 dst6->sin6_family = AF_INET6;
5322                 dst6->sin6_len = sizeof(*dst6);
5323                 dst6->sin6_addr = addr->v6;
5324                 break;
5325 #endif /* INET6 */
5326         default:
5327                 return (0);
5328         }
5329
5330         /* Skip checks for ipsec interfaces */
5331         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5332                 goto out;
5333
5334         switch (af) {
5335 #ifdef INET6
5336         case AF_INET6:
5337                 in6_rtalloc_ign(&ro, 0, rtableid);
5338                 break;
5339 #endif
5340 #ifdef INET
5341         case AF_INET:
5342                 in_rtalloc_ign((struct route *)&ro, 0, rtableid);
5343                 break;
5344 #endif
5345         }
5346
5347         if (ro.ro_rt != NULL) {
5348                 /* No interface given, this is a no-route check */
5349                 if (kif == NULL)
5350                         goto out;
5351
5352                 if (kif->pfik_ifp == NULL) {
5353                         ret = 0;
5354                         goto out;
5355                 }
5356
5357                 /* Perform uRPF check if passed input interface */
5358                 ret = 0;
5359                 rn = (struct radix_node *)ro.ro_rt;
5360                 do {
5361                         rt = (struct rtentry *)rn;
5362                         ifp = rt->rt_ifp;
5363
5364                         if (kif->pfik_ifp == ifp)
5365                                 ret = 1;
5366                         rn = rn_mpath_next(rn);
5367                 } while (check_mpath == 1 && rn != NULL && ret == 0);
5368         } else
5369                 ret = 0;
5370 out:
5371         if (ro.ro_rt != NULL)
5372                 RTFREE(ro.ro_rt);
5373         return (ret);
5374 }
5375 #endif
5376
5377 int
5378 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
5379     int rtableid)
5380 {
5381 #ifdef INET
5382         struct nhop4_basic      nh4;
5383 #endif
5384 #ifdef INET6
5385         struct nhop6_basic      nh6;
5386 #endif
5387         struct ifnet            *ifp;
5388 #ifdef RADIX_MPATH
5389         struct radix_node_head  *rnh;
5390
5391         /* XXX: stick to table 0 for now */
5392         rnh = rt_tables_get_rnh(0, af);
5393         if (rnh != NULL && rn_mpath_capable(rnh))
5394                 return (pf_routable_oldmpath(addr, af, kif, rtableid));
5395 #endif
5396         /*
5397          * Skip check for addresses with embedded interface scope,
5398          * as they would always match anyway.
5399          */
5400         if (af == AF_INET6 && IN6_IS_SCOPE_EMBED(&addr->v6))
5401                 return (1);
5402
5403         if (af != AF_INET && af != AF_INET6)
5404                 return (0);
5405
5406         /* Skip checks for ipsec interfaces */
5407         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
5408                 return (1);
5409
5410         ifp = NULL;
5411
5412         switch (af) {
5413 #ifdef INET6
5414         case AF_INET6:
5415                 if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
5416                         return (0);
5417                 ifp = nh6.nh_ifp;
5418                 break;
5419 #endif
5420 #ifdef INET
5421         case AF_INET:
5422                 if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
5423                         return (0);
5424                 ifp = nh4.nh_ifp;
5425                 break;
5426 #endif
5427         }
5428
5429         /* No interface given, this is a no-route check */
5430         if (kif == NULL)
5431                 return (1);
5432
5433         if (kif->pfik_ifp == NULL)
5434                 return (0);
5435
5436         /* Perform uRPF check if passed input interface */
5437         if (kif->pfik_ifp == ifp)
5438                 return (1);
5439         return (0);
5440 }
5441
5442 #ifdef INET
5443 static void
5444 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5445     struct pf_state *s, struct pf_pdesc *pd)
5446 {
5447         struct mbuf             *m0, *m1;
5448         struct sockaddr_in      dst;
5449         struct ip               *ip;
5450         struct ifnet            *ifp = NULL;
5451         struct pf_addr           naddr;
5452         struct pf_src_node      *sn = NULL;
5453         int                      error = 0;
5454         uint16_t                 ip_len, ip_off;
5455
5456         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5457         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5458             __func__));
5459
5460         if ((pd->pf_mtag == NULL &&
5461             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5462             pd->pf_mtag->routed++ > 3) {
5463                 m0 = *m;
5464                 *m = NULL;
5465                 goto bad_locked;
5466         }
5467
5468         if (r->rt == PF_DUPTO) {
5469                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5470                         if (s)
5471                                 PF_STATE_UNLOCK(s);
5472                         return;
5473                 }
5474         } else {
5475                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5476                         if (s)
5477                                 PF_STATE_UNLOCK(s);
5478                         return;
5479                 }
5480                 m0 = *m;
5481         }
5482
5483         ip = mtod(m0, struct ip *);
5484
5485         bzero(&dst, sizeof(dst));
5486         dst.sin_family = AF_INET;
5487         dst.sin_len = sizeof(dst);
5488         dst.sin_addr = ip->ip_dst;
5489
5490         if (TAILQ_EMPTY(&r->rpool.list)) {
5491                 DPFPRINTF(PF_DEBUG_URGENT,
5492                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5493                 goto bad_locked;
5494         }
5495         if (s == NULL) {
5496                 pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
5497                     &naddr, NULL, &sn);
5498                 if (!PF_AZERO(&naddr, AF_INET))
5499                         dst.sin_addr.s_addr = naddr.v4.s_addr;
5500                 ifp = r->rpool.cur->kif ?
5501                     r->rpool.cur->kif->pfik_ifp : NULL;
5502         } else {
5503                 if (!PF_AZERO(&s->rt_addr, AF_INET))
5504                         dst.sin_addr.s_addr =
5505                             s->rt_addr.v4.s_addr;
5506                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5507                 PF_STATE_UNLOCK(s);
5508         }
5509         if (ifp == NULL)
5510                 goto bad;
5511
5512         if (oifp != ifp) {
5513                 if (pf_test(PF_OUT, 0, ifp, &m0, NULL) != PF_PASS)
5514                         goto bad;
5515                 else if (m0 == NULL)
5516                         goto done;
5517                 if (m0->m_len < sizeof(struct ip)) {
5518                         DPFPRINTF(PF_DEBUG_URGENT,
5519                             ("%s: m0->m_len < sizeof(struct ip)\n", __func__));
5520                         goto bad;
5521                 }
5522                 ip = mtod(m0, struct ip *);
5523         }
5524
5525         if (ifp->if_flags & IFF_LOOPBACK)
5526                 m0->m_flags |= M_SKIP_FIREWALL;
5527
5528         ip_len = ntohs(ip->ip_len);
5529         ip_off = ntohs(ip->ip_off);
5530
5531         /* Copied from FreeBSD 10.0-CURRENT ip_output. */
5532         m0->m_pkthdr.csum_flags |= CSUM_IP;
5533         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
5534                 in_delayed_cksum(m0);
5535                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
5536         }
5537 #ifdef SCTP
5538         if (m0->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
5539                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
5540                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
5541         }
5542 #endif
5543
5544         /*
5545          * If small enough for interface, or the interface will take
5546          * care of the fragmentation for us, we can just send directly.
5547          */
5548         if (ip_len <= ifp->if_mtu ||
5549             (m0->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
5550                 ip->ip_sum = 0;
5551                 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
5552                         ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
5553                         m0->m_pkthdr.csum_flags &= ~CSUM_IP;
5554                 }
5555                 m_clrprotoflags(m0);    /* Avoid confusing lower layers. */
5556                 error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5557                 goto done;
5558         }
5559
5560         /* Balk when DF bit is set or the interface didn't support TSO. */
5561         if ((ip_off & IP_DF) || (m0->m_pkthdr.csum_flags & CSUM_TSO)) {
5562                 error = EMSGSIZE;
5563                 KMOD_IPSTAT_INC(ips_cantfrag);
5564                 if (r->rt != PF_DUPTO) {
5565                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
5566                             ifp->if_mtu);
5567                         goto done;
5568                 } else
5569                         goto bad;
5570         }
5571
5572         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist);
5573         if (error)
5574                 goto bad;
5575
5576         for (; m0; m0 = m1) {
5577                 m1 = m0->m_nextpkt;
5578                 m0->m_nextpkt = NULL;
5579                 if (error == 0) {
5580                         m_clrprotoflags(m0);
5581                         error = (*ifp->if_output)(ifp, m0, sintosa(&dst), NULL);
5582                 } else
5583                         m_freem(m0);
5584         }
5585
5586         if (error == 0)
5587                 KMOD_IPSTAT_INC(ips_fragmented);
5588
5589 done:
5590         if (r->rt != PF_DUPTO)
5591                 *m = NULL;
5592         return;
5593
5594 bad_locked:
5595         if (s)
5596                 PF_STATE_UNLOCK(s);
5597 bad:
5598         m_freem(m0);
5599         goto done;
5600 }
5601 #endif /* INET */
5602
5603 #ifdef INET6
5604 static void
5605 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
5606     struct pf_state *s, struct pf_pdesc *pd)
5607 {
5608         struct mbuf             *m0;
5609         struct sockaddr_in6     dst;
5610         struct ip6_hdr          *ip6;
5611         struct ifnet            *ifp = NULL;
5612         struct pf_addr           naddr;
5613         struct pf_src_node      *sn = NULL;
5614
5615         KASSERT(m && *m && r && oifp, ("%s: invalid parameters", __func__));
5616         KASSERT(dir == PF_IN || dir == PF_OUT, ("%s: invalid direction",
5617             __func__));
5618
5619         if ((pd->pf_mtag == NULL &&
5620             ((pd->pf_mtag = pf_get_mtag(*m)) == NULL)) ||
5621             pd->pf_mtag->routed++ > 3) {
5622                 m0 = *m;
5623                 *m = NULL;
5624                 goto bad_locked;
5625         }
5626
5627         if (r->rt == PF_DUPTO) {
5628                 if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) {
5629                         if (s)
5630                                 PF_STATE_UNLOCK(s);
5631                         return;
5632                 }
5633         } else {
5634                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
5635                         if (s)
5636                                 PF_STATE_UNLOCK(s);
5637                         return;
5638                 }
5639                 m0 = *m;
5640         }
5641
5642         ip6 = mtod(m0, struct ip6_hdr *);
5643
5644         bzero(&dst, sizeof(dst));
5645         dst.sin6_family = AF_INET6;
5646         dst.sin6_len = sizeof(dst);
5647         dst.sin6_addr = ip6->ip6_dst;
5648
5649         if (TAILQ_EMPTY(&r->rpool.list)) {
5650                 DPFPRINTF(PF_DEBUG_URGENT,
5651                     ("%s: TAILQ_EMPTY(&r->rpool.list)\n", __func__));
5652                 goto bad_locked;
5653         }
5654         if (s == NULL) {
5655                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
5656                     &naddr, NULL, &sn);
5657                 if (!PF_AZERO(&naddr, AF_INET6))
5658                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5659                             &naddr, AF_INET6);
5660                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
5661         } else {
5662                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
5663                         PF_ACPY((struct pf_addr *)&dst.sin6_addr,
5664                             &s->rt_addr, AF_INET6);
5665                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
5666         }
5667
5668         if (s)
5669                 PF_STATE_UNLOCK(s);
5670
5671         if (ifp == NULL)
5672                 goto bad;
5673
5674         if (oifp != ifp) {
5675                 if (pf_test6(PF_OUT, PFIL_FWD, ifp, &m0, NULL) != PF_PASS)
5676                         goto bad;
5677                 else if (m0 == NULL)
5678                         goto done;
5679                 if (m0->m_len < sizeof(struct ip6_hdr)) {
5680                         DPFPRINTF(PF_DEBUG_URGENT,
5681                             ("%s: m0->m_len < sizeof(struct ip6_hdr)\n",
5682                             __func__));
5683                         goto bad;
5684                 }
5685                 ip6 = mtod(m0, struct ip6_hdr *);
5686         }
5687
5688         if (ifp->if_flags & IFF_LOOPBACK)
5689                 m0->m_flags |= M_SKIP_FIREWALL;
5690
5691         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6 &
5692             ~ifp->if_hwassist) {
5693                 uint32_t plen = m0->m_pkthdr.len - sizeof(*ip6);
5694                 in6_delayed_cksum(m0, plen, sizeof(struct ip6_hdr));
5695                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
5696         }
5697
5698         /*
5699          * If the packet is too large for the outgoing interface,
5700          * send back an icmp6 error.
5701          */
5702         if (IN6_IS_SCOPE_EMBED(&dst.sin6_addr))
5703                 dst.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
5704         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu)
5705                 nd6_output_ifp(ifp, ifp, m0, &dst, NULL);
5706         else {
5707                 in6_ifstat_inc(ifp, ifs6_in_toobig);
5708                 if (r->rt != PF_DUPTO)
5709                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
5710                 else
5711                         goto bad;
5712         }
5713
5714 done:
5715         if (r->rt != PF_DUPTO)
5716                 *m = NULL;
5717         return;
5718
5719 bad_locked:
5720         if (s)
5721                 PF_STATE_UNLOCK(s);
5722 bad:
5723         m_freem(m0);
5724         goto done;
5725 }
5726 #endif /* INET6 */
5727
5728 /*
5729  * FreeBSD supports cksum offloads for the following drivers.
5730  *  em(4), fxp(4), lge(4), ndis(4), nge(4), re(4), ti(4), txp(4), xl(4)
5731  *
5732  * CSUM_DATA_VALID | CSUM_PSEUDO_HDR :
5733  *  network driver performed cksum including pseudo header, need to verify
5734  *   csum_data
5735  * CSUM_DATA_VALID :
5736  *  network driver performed cksum, needs to additional pseudo header
5737  *  cksum computation with partial csum_data(i.e. lack of H/W support for
5738  *  pseudo header, for instance hme(4), sk(4) and possibly gem(4))
5739  *
5740  * After validating the cksum of packet, set both flag CSUM_DATA_VALID and
5741  * CSUM_PSEUDO_HDR in order to avoid recomputation of the cksum in upper
5742  * TCP/UDP layer.
5743  * Also, set csum_data to 0xffff to force cksum validation.
5744  */
5745 static int
5746 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
5747 {
5748         u_int16_t sum = 0;
5749         int hw_assist = 0;
5750         struct ip *ip;
5751
5752         if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
5753                 return (1);
5754         if (m->m_pkthdr.len < off + len)
5755                 return (1);
5756
5757         switch (p) {
5758         case IPPROTO_TCP:
5759                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5760                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5761                                 sum = m->m_pkthdr.csum_data;
5762                         } else {
5763                                 ip = mtod(m, struct ip *);
5764                                 sum = in_pseudo(ip->ip_src.s_addr,
5765                                 ip->ip_dst.s_addr, htonl((u_short)len +
5766                                 m->m_pkthdr.csum_data + IPPROTO_TCP));
5767                         }
5768                         sum ^= 0xffff;
5769                         ++hw_assist;
5770                 }
5771                 break;
5772         case IPPROTO_UDP:
5773                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
5774                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
5775                                 sum = m->m_pkthdr.csum_data;
5776                         } else {
5777                                 ip = mtod(m, struct ip *);
5778                                 sum = in_pseudo(ip->ip_src.s_addr,
5779                                 ip->ip_dst.s_addr, htonl((u_short)len +
5780                                 m->m_pkthdr.csum_data + IPPROTO_UDP));
5781                         }
5782                         sum ^= 0xffff;
5783                         ++hw_assist;
5784                 }
5785                 break;
5786         case IPPROTO_ICMP:
5787 #ifdef INET6
5788         case IPPROTO_ICMPV6:
5789 #endif /* INET6 */
5790                 break;
5791         default:
5792                 return (1);
5793         }
5794
5795         if (!hw_assist) {
5796                 switch (af) {
5797                 case AF_INET:
5798                         if (p == IPPROTO_ICMP) {
5799                                 if (m->m_len < off)
5800                                         return (1);
5801                                 m->m_data += off;
5802                                 m->m_len -= off;
5803                                 sum = in_cksum(m, len);
5804                                 m->m_data -= off;
5805                                 m->m_len += off;
5806                         } else {
5807                                 if (m->m_len < sizeof(struct ip))
5808                                         return (1);
5809                                 sum = in4_cksum(m, p, off, len);
5810                         }
5811                         break;
5812 #ifdef INET6
5813                 case AF_INET6:
5814                         if (m->m_len < sizeof(struct ip6_hdr))
5815                                 return (1);
5816                         sum = in6_cksum(m, p, off, len);
5817                         break;
5818 #endif /* INET6 */
5819                 default:
5820                         return (1);
5821                 }
5822         }
5823         if (sum) {
5824                 switch (p) {
5825                 case IPPROTO_TCP:
5826                     {
5827                         KMOD_TCPSTAT_INC(tcps_rcvbadsum);
5828                         break;
5829                     }
5830                 case IPPROTO_UDP:
5831                     {
5832                         KMOD_UDPSTAT_INC(udps_badsum);
5833                         break;
5834                     }
5835 #ifdef INET
5836                 case IPPROTO_ICMP:
5837                     {
5838                         KMOD_ICMPSTAT_INC(icps_checksum);
5839                         break;
5840                     }
5841 #endif
5842 #ifdef INET6
5843                 case IPPROTO_ICMPV6:
5844                     {
5845                         KMOD_ICMP6STAT_INC(icp6s_checksum);
5846                         break;
5847                     }
5848 #endif /* INET6 */
5849                 }
5850                 return (1);
5851         } else {
5852                 if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
5853                         m->m_pkthdr.csum_flags |=
5854                             (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
5855                         m->m_pkthdr.csum_data = 0xffff;
5856                 }
5857         }
5858         return (0);
5859 }
5860
5861
5862 #ifdef INET
5863 int
5864 pf_test(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
5865 {
5866         struct pfi_kif          *kif;
5867         u_short                  action, reason = 0, log = 0;
5868         struct mbuf             *m = *m0;
5869         struct ip               *h = NULL;
5870         struct m_tag            *ipfwtag;
5871         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
5872         struct pf_state         *s = NULL;
5873         struct pf_ruleset       *ruleset = NULL;
5874         struct pf_pdesc          pd;
5875         int                      off, dirndx, pqid = 0;
5876
5877         M_ASSERTPKTHDR(m);
5878
5879         if (!V_pf_status.running)
5880                 return (PF_PASS);
5881
5882         memset(&pd, 0, sizeof(pd));
5883
5884         kif = (struct pfi_kif *)ifp->if_pf_kif;
5885
5886         if (kif == NULL) {
5887                 DPFPRINTF(PF_DEBUG_URGENT,
5888                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
5889                 return (PF_DROP);
5890         }
5891         if (kif->pfik_flags & PFI_IFLAG_SKIP)
5892                 return (PF_PASS);
5893
5894         if (m->m_flags & M_SKIP_FIREWALL)
5895                 return (PF_PASS);
5896
5897         pd.pf_mtag = pf_find_mtag(m);
5898
5899         PF_RULES_RLOCK();
5900
5901         if (ip_divert_ptr != NULL &&
5902             ((ipfwtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL)) != NULL)) {
5903                 struct ipfw_rule_ref *rr = (struct ipfw_rule_ref *)(ipfwtag+1);
5904                 if (rr->info & IPFW_IS_DIVERT && rr->rulenum == 0) {
5905                         if (pd.pf_mtag == NULL &&
5906                             ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
5907                                 action = PF_DROP;
5908                                 goto done;
5909                         }
5910                         pd.pf_mtag->flags |= PF_PACKET_LOOPED;
5911                         m_tag_delete(m, ipfwtag);
5912                 }
5913                 if (pd.pf_mtag && pd.pf_mtag->flags & PF_FASTFWD_OURS_PRESENT) {
5914                         m->m_flags |= M_FASTFWD_OURS;
5915                         pd.pf_mtag->flags &= ~PF_FASTFWD_OURS_PRESENT;
5916                 }
5917         } else if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
5918                 /* We do IP header normalization and packet reassembly here */
5919                 action = PF_DROP;
5920                 goto done;
5921         }
5922         m = *m0;        /* pf_normalize messes with m0 */
5923         h = mtod(m, struct ip *);
5924
5925         off = h->ip_hl << 2;
5926         if (off < (int)sizeof(struct ip)) {
5927                 action = PF_DROP;
5928                 REASON_SET(&reason, PFRES_SHORT);
5929                 log = 1;
5930                 goto done;
5931         }
5932
5933         pd.src = (struct pf_addr *)&h->ip_src;
5934         pd.dst = (struct pf_addr *)&h->ip_dst;
5935         pd.sport = pd.dport = NULL;
5936         pd.ip_sum = &h->ip_sum;
5937         pd.proto_sum = NULL;
5938         pd.proto = h->ip_p;
5939         pd.dir = dir;
5940         pd.sidx = (dir == PF_IN) ? 0 : 1;
5941         pd.didx = (dir == PF_IN) ? 1 : 0;
5942         pd.af = AF_INET;
5943         pd.tos = h->ip_tos & ~IPTOS_ECN_MASK;
5944         pd.tot_len = ntohs(h->ip_len);
5945
5946         /* handle fragments that didn't get reassembled by normalization */
5947         if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
5948                 action = pf_test_fragment(&r, dir, kif, m, h,
5949                     &pd, &a, &ruleset);
5950                 goto done;
5951         }
5952
5953         switch (h->ip_p) {
5954
5955         case IPPROTO_TCP: {
5956                 struct tcphdr   th;
5957
5958                 pd.hdr.tcp = &th;
5959                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
5960                     &action, &reason, AF_INET)) {
5961                         log = action != PF_PASS;
5962                         goto done;
5963                 }
5964                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
5965                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
5966                         pqid = 1;
5967                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
5968                 if (action == PF_DROP)
5969                         goto done;
5970                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
5971                     &reason);
5972                 if (action == PF_PASS) {
5973                         if (pfsync_update_state_ptr != NULL)
5974                                 pfsync_update_state_ptr(s);
5975                         r = s->rule.ptr;
5976                         a = s->anchor.ptr;
5977                         log = s->log;
5978                 } else if (s == NULL)
5979                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
5980                             &a, &ruleset, inp);
5981                 break;
5982         }
5983
5984         case IPPROTO_UDP: {
5985                 struct udphdr   uh;
5986
5987                 pd.hdr.udp = &uh;
5988                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
5989                     &action, &reason, AF_INET)) {
5990                         log = action != PF_PASS;
5991                         goto done;
5992                 }
5993                 if (uh.uh_dport == 0 ||
5994                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
5995                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
5996                         action = PF_DROP;
5997                         REASON_SET(&reason, PFRES_SHORT);
5998                         goto done;
5999                 }
6000                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6001                 if (action == PF_PASS) {
6002                         if (pfsync_update_state_ptr != NULL)
6003                                 pfsync_update_state_ptr(s);
6004                         r = s->rule.ptr;
6005                         a = s->anchor.ptr;
6006                         log = s->log;
6007                 } else if (s == NULL)
6008                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6009                             &a, &ruleset, inp);
6010                 break;
6011         }
6012
6013         case IPPROTO_ICMP: {
6014                 struct icmp     ih;
6015
6016                 pd.hdr.icmp = &ih;
6017                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
6018                     &action, &reason, AF_INET)) {
6019                         log = action != PF_PASS;
6020                         goto done;
6021                 }
6022                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
6023                     &reason);
6024                 if (action == PF_PASS) {
6025                         if (pfsync_update_state_ptr != NULL)
6026                                 pfsync_update_state_ptr(s);
6027                         r = s->rule.ptr;
6028                         a = s->anchor.ptr;
6029                         log = s->log;
6030                 } else if (s == NULL)
6031                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6032                             &a, &ruleset, inp);
6033                 break;
6034         }
6035
6036 #ifdef INET6
6037         case IPPROTO_ICMPV6: {
6038                 action = PF_DROP;
6039                 DPFPRINTF(PF_DEBUG_MISC,
6040                     ("pf: dropping IPv4 packet with ICMPv6 payload\n"));
6041                 goto done;
6042         }
6043 #endif
6044
6045         default:
6046                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6047                 if (action == PF_PASS) {
6048                         if (pfsync_update_state_ptr != NULL)
6049                                 pfsync_update_state_ptr(s);
6050                         r = s->rule.ptr;
6051                         a = s->anchor.ptr;
6052                         log = s->log;
6053                 } else if (s == NULL)
6054                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6055                             &a, &ruleset, inp);
6056                 break;
6057         }
6058
6059 done:
6060         PF_RULES_RUNLOCK();
6061         if (action == PF_PASS && h->ip_hl > 5 &&
6062             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6063                 action = PF_DROP;
6064                 REASON_SET(&reason, PFRES_IPOPTIONS);
6065                 log = r->log;
6066                 DPFPRINTF(PF_DEBUG_MISC,
6067                     ("pf: dropping packet with ip options\n"));
6068         }
6069
6070         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6071                 action = PF_DROP;
6072                 REASON_SET(&reason, PFRES_MEMORY);
6073         }
6074         if (r->rtableid >= 0)
6075                 M_SETFIB(m, r->rtableid);
6076
6077         if (r->scrub_flags & PFSTATE_SETPRIO) {
6078                 if (pd.tos & IPTOS_LOWDELAY)
6079                         pqid = 1;
6080                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6081                         action = PF_DROP;
6082                         REASON_SET(&reason, PFRES_MEMORY);
6083                         log = 1;
6084                         DPFPRINTF(PF_DEBUG_MISC,
6085                             ("pf: failed to allocate 802.1q mtag\n"));
6086                 }
6087         }
6088
6089 #ifdef ALTQ
6090         if (action == PF_PASS && r->qid) {
6091                 if (pd.pf_mtag == NULL &&
6092                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6093                         action = PF_DROP;
6094                         REASON_SET(&reason, PFRES_MEMORY);
6095                 } else {
6096                         if (s != NULL)
6097                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6098                         if (pqid || (pd.tos & IPTOS_LOWDELAY))
6099                                 pd.pf_mtag->qid = r->pqid;
6100                         else
6101                                 pd.pf_mtag->qid = r->qid;
6102                         /* Add hints for ecn. */
6103                         pd.pf_mtag->hdr = h;
6104                 }
6105
6106         }
6107 #endif /* ALTQ */
6108
6109         /*
6110          * connections redirected to loopback should not match sockets
6111          * bound specifically to loopback due to security implications,
6112          * see tcp_input() and in_pcblookup_listen().
6113          */
6114         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6115             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6116             (s->nat_rule.ptr->action == PF_RDR ||
6117             s->nat_rule.ptr->action == PF_BINAT) &&
6118             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
6119                 m->m_flags |= M_SKIP_FIREWALL;
6120
6121         if (action == PF_PASS && r->divert.port && ip_divert_ptr != NULL &&
6122             !PACKET_LOOPED(&pd)) {
6123
6124                 ipfwtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
6125                     sizeof(struct ipfw_rule_ref), M_NOWAIT | M_ZERO);
6126                 if (ipfwtag != NULL) {
6127                         ((struct ipfw_rule_ref *)(ipfwtag+1))->info =
6128                             ntohs(r->divert.port);
6129                         ((struct ipfw_rule_ref *)(ipfwtag+1))->rulenum = dir;
6130
6131                         if (s)
6132                                 PF_STATE_UNLOCK(s);
6133
6134                         m_tag_prepend(m, ipfwtag);
6135                         if (m->m_flags & M_FASTFWD_OURS) {
6136                                 if (pd.pf_mtag == NULL &&
6137                                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6138                                         action = PF_DROP;
6139                                         REASON_SET(&reason, PFRES_MEMORY);
6140                                         log = 1;
6141                                         DPFPRINTF(PF_DEBUG_MISC,
6142                                             ("pf: failed to allocate tag\n"));
6143                                 } else {
6144                                         pd.pf_mtag->flags |=
6145                                             PF_FASTFWD_OURS_PRESENT;
6146                                         m->m_flags &= ~M_FASTFWD_OURS;
6147                                 }
6148                         }
6149                         ip_divert_ptr(*m0, dir ==  PF_IN ? DIR_IN : DIR_OUT);
6150                         *m0 = NULL;
6151
6152                         return (action);
6153                 } else {
6154                         /* XXX: ipfw has the same behaviour! */
6155                         action = PF_DROP;
6156                         REASON_SET(&reason, PFRES_MEMORY);
6157                         log = 1;
6158                         DPFPRINTF(PF_DEBUG_MISC,
6159                             ("pf: failed to allocate divert tag\n"));
6160                 }
6161         }
6162
6163         if (log) {
6164                 struct pf_rule *lr;
6165
6166                 if (s != NULL && s->nat_rule.ptr != NULL &&
6167                     s->nat_rule.ptr->log & PF_LOG_ALL)
6168                         lr = s->nat_rule.ptr;
6169                 else
6170                         lr = r;
6171                 PFLOG_PACKET(kif, m, AF_INET, dir, reason, lr, a, ruleset, &pd,
6172                     (s == NULL));
6173         }
6174
6175         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6176         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
6177
6178         if (action == PF_PASS || r->action == PF_DROP) {
6179                 dirndx = (dir == PF_OUT);
6180                 r->packets[dirndx]++;
6181                 r->bytes[dirndx] += pd.tot_len;
6182                 if (a != NULL) {
6183                         a->packets[dirndx]++;
6184                         a->bytes[dirndx] += pd.tot_len;
6185                 }
6186                 if (s != NULL) {
6187                         if (s->nat_rule.ptr != NULL) {
6188                                 s->nat_rule.ptr->packets[dirndx]++;
6189                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6190                         }
6191                         if (s->src_node != NULL) {
6192                                 s->src_node->packets[dirndx]++;
6193                                 s->src_node->bytes[dirndx] += pd.tot_len;
6194                         }
6195                         if (s->nat_src_node != NULL) {
6196                                 s->nat_src_node->packets[dirndx]++;
6197                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6198                         }
6199                         dirndx = (dir == s->direction) ? 0 : 1;
6200                         s->packets[dirndx]++;
6201                         s->bytes[dirndx] += pd.tot_len;
6202                 }
6203                 tr = r;
6204                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6205                 if (nr != NULL && r == &V_pf_default_rule)
6206                         tr = nr;
6207                 if (tr->src.addr.type == PF_ADDR_TABLE)
6208                         pfr_update_stats(tr->src.addr.p.tbl,
6209                             (s == NULL) ? pd.src :
6210                             &s->key[(s->direction == PF_IN)]->
6211                                 addr[(s->direction == PF_OUT)],
6212                             pd.af, pd.tot_len, dir == PF_OUT,
6213                             r->action == PF_PASS, tr->src.neg);
6214                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6215                         pfr_update_stats(tr->dst.addr.p.tbl,
6216                             (s == NULL) ? pd.dst :
6217                             &s->key[(s->direction == PF_IN)]->
6218                                 addr[(s->direction == PF_IN)],
6219                             pd.af, pd.tot_len, dir == PF_OUT,
6220                             r->action == PF_PASS, tr->dst.neg);
6221         }
6222
6223         switch (action) {
6224         case PF_SYNPROXY_DROP:
6225                 m_freem(*m0);
6226         case PF_DEFER:
6227                 *m0 = NULL;
6228                 action = PF_PASS;
6229                 break;
6230         case PF_DROP:
6231                 m_freem(*m0);
6232                 *m0 = NULL;
6233                 break;
6234         default:
6235                 /* pf_route() returns unlocked. */
6236                 if (r->rt) {
6237                         pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
6238                         return (action);
6239                 }
6240                 break;
6241         }
6242         if (s)
6243                 PF_STATE_UNLOCK(s);
6244
6245         return (action);
6246 }
6247 #endif /* INET */
6248
6249 #ifdef INET6
6250 int
6251 pf_test6(int dir, int pflags, struct ifnet *ifp, struct mbuf **m0, struct inpcb *inp)
6252 {
6253         struct pfi_kif          *kif;
6254         u_short                  action, reason = 0, log = 0;
6255         struct mbuf             *m = *m0, *n = NULL;
6256         struct m_tag            *mtag;
6257         struct ip6_hdr          *h = NULL;
6258         struct pf_rule          *a = NULL, *r = &V_pf_default_rule, *tr, *nr;
6259         struct pf_state         *s = NULL;
6260         struct pf_ruleset       *ruleset = NULL;
6261         struct pf_pdesc          pd;
6262         int                      off, terminal = 0, dirndx, rh_cnt = 0, pqid = 0;
6263
6264         M_ASSERTPKTHDR(m);
6265
6266         if (!V_pf_status.running)
6267                 return (PF_PASS);
6268
6269         memset(&pd, 0, sizeof(pd));
6270         pd.pf_mtag = pf_find_mtag(m);
6271
6272         if (pd.pf_mtag && pd.pf_mtag->flags & PF_TAG_GENERATED)
6273                 return (PF_PASS);
6274
6275         kif = (struct pfi_kif *)ifp->if_pf_kif;
6276         if (kif == NULL) {
6277                 DPFPRINTF(PF_DEBUG_URGENT,
6278                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
6279                 return (PF_DROP);
6280         }
6281         if (kif->pfik_flags & PFI_IFLAG_SKIP)
6282                 return (PF_PASS);
6283
6284         if (m->m_flags & M_SKIP_FIREWALL)
6285                 return (PF_PASS);
6286
6287         PF_RULES_RLOCK();
6288
6289         /* We do IP header normalization and packet reassembly here */
6290         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
6291                 action = PF_DROP;
6292                 goto done;
6293         }
6294         m = *m0;        /* pf_normalize messes with m0 */
6295         h = mtod(m, struct ip6_hdr *);
6296
6297 #if 1
6298         /*
6299          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
6300          * will do something bad, so drop the packet for now.
6301          */
6302         if (htons(h->ip6_plen) == 0) {
6303                 action = PF_DROP;
6304                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
6305                 goto done;
6306         }
6307 #endif
6308
6309         pd.src = (struct pf_addr *)&h->ip6_src;
6310         pd.dst = (struct pf_addr *)&h->ip6_dst;
6311         pd.sport = pd.dport = NULL;
6312         pd.ip_sum = NULL;
6313         pd.proto_sum = NULL;
6314         pd.dir = dir;
6315         pd.sidx = (dir == PF_IN) ? 0 : 1;
6316         pd.didx = (dir == PF_IN) ? 1 : 0;
6317         pd.af = AF_INET6;
6318         pd.tos = 0;
6319         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
6320
6321         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
6322         pd.proto = h->ip6_nxt;
6323         do {
6324                 switch (pd.proto) {
6325                 case IPPROTO_FRAGMENT:
6326                         action = pf_test_fragment(&r, dir, kif, m, h,
6327                             &pd, &a, &ruleset);
6328                         if (action == PF_DROP)
6329                                 REASON_SET(&reason, PFRES_FRAG);
6330                         goto done;
6331                 case IPPROTO_ROUTING: {
6332                         struct ip6_rthdr rthdr;
6333
6334                         if (rh_cnt++) {
6335                                 DPFPRINTF(PF_DEBUG_MISC,
6336                                     ("pf: IPv6 more than one rthdr\n"));
6337                                 action = PF_DROP;
6338                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6339                                 log = 1;
6340                                 goto done;
6341                         }
6342                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
6343                             &reason, pd.af)) {
6344                                 DPFPRINTF(PF_DEBUG_MISC,
6345                                     ("pf: IPv6 short rthdr\n"));
6346                                 action = PF_DROP;
6347                                 REASON_SET(&reason, PFRES_SHORT);
6348                                 log = 1;
6349                                 goto done;
6350                         }
6351                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
6352                                 DPFPRINTF(PF_DEBUG_MISC,
6353                                     ("pf: IPv6 rthdr0\n"));
6354                                 action = PF_DROP;
6355                                 REASON_SET(&reason, PFRES_IPOPTIONS);
6356                                 log = 1;
6357                                 goto done;
6358                         }
6359                         /* FALLTHROUGH */
6360                 }
6361                 case IPPROTO_AH:
6362                 case IPPROTO_HOPOPTS:
6363                 case IPPROTO_DSTOPTS: {
6364                         /* get next header and header length */
6365                         struct ip6_ext  opt6;
6366
6367                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
6368                             NULL, &reason, pd.af)) {
6369                                 DPFPRINTF(PF_DEBUG_MISC,
6370                                     ("pf: IPv6 short opt\n"));
6371                                 action = PF_DROP;
6372                                 log = 1;
6373                                 goto done;
6374                         }
6375                         if (pd.proto == IPPROTO_AH)
6376                                 off += (opt6.ip6e_len + 2) * 4;
6377                         else
6378                                 off += (opt6.ip6e_len + 1) * 8;
6379                         pd.proto = opt6.ip6e_nxt;
6380                         /* goto the next header */
6381                         break;
6382                 }
6383                 default:
6384                         terminal++;
6385                         break;
6386                 }
6387         } while (!terminal);
6388
6389         /* if there's no routing header, use unmodified mbuf for checksumming */
6390         if (!n)
6391                 n = m;
6392
6393         switch (pd.proto) {
6394
6395         case IPPROTO_TCP: {
6396                 struct tcphdr   th;
6397
6398                 pd.hdr.tcp = &th;
6399                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
6400                     &action, &reason, AF_INET6)) {
6401                         log = action != PF_PASS;
6402                         goto done;
6403                 }
6404                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
6405                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
6406                 if (action == PF_DROP)
6407                         goto done;
6408                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
6409                     &reason);
6410                 if (action == PF_PASS) {
6411                         if (pfsync_update_state_ptr != NULL)
6412                                 pfsync_update_state_ptr(s);
6413                         r = s->rule.ptr;
6414                         a = s->anchor.ptr;
6415                         log = s->log;
6416                 } else if (s == NULL)
6417                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6418                             &a, &ruleset, inp);
6419                 break;
6420         }
6421
6422         case IPPROTO_UDP: {
6423                 struct udphdr   uh;
6424
6425                 pd.hdr.udp = &uh;
6426                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
6427                     &action, &reason, AF_INET6)) {
6428                         log = action != PF_PASS;
6429                         goto done;
6430                 }
6431                 if (uh.uh_dport == 0 ||
6432                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
6433                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
6434                         action = PF_DROP;
6435                         REASON_SET(&reason, PFRES_SHORT);
6436                         goto done;
6437                 }
6438                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
6439                 if (action == PF_PASS) {
6440                         if (pfsync_update_state_ptr != NULL)
6441                                 pfsync_update_state_ptr(s);
6442                         r = s->rule.ptr;
6443                         a = s->anchor.ptr;
6444                         log = s->log;
6445                 } else if (s == NULL)
6446                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6447                             &a, &ruleset, inp);
6448                 break;
6449         }
6450
6451         case IPPROTO_ICMP: {
6452                 action = PF_DROP;
6453                 DPFPRINTF(PF_DEBUG_MISC,
6454                     ("pf: dropping IPv6 packet with ICMPv4 payload\n"));
6455                 goto done;
6456         }
6457
6458         case IPPROTO_ICMPV6: {
6459                 struct icmp6_hdr        ih;
6460
6461                 pd.hdr.icmp6 = &ih;
6462                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
6463                     &action, &reason, AF_INET6)) {
6464                         log = action != PF_PASS;
6465                         goto done;
6466                 }
6467                 action = pf_test_state_icmp(&s, dir, kif,
6468                     m, off, h, &pd, &reason);
6469                 if (action == PF_PASS) {
6470                         if (pfsync_update_state_ptr != NULL)
6471                                 pfsync_update_state_ptr(s);
6472                         r = s->rule.ptr;
6473                         a = s->anchor.ptr;
6474                         log = s->log;
6475                 } else if (s == NULL)
6476                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6477                             &a, &ruleset, inp);
6478                 break;
6479         }
6480
6481         default:
6482                 action = pf_test_state_other(&s, dir, kif, m, &pd);
6483                 if (action == PF_PASS) {
6484                         if (pfsync_update_state_ptr != NULL)
6485                                 pfsync_update_state_ptr(s);
6486                         r = s->rule.ptr;
6487                         a = s->anchor.ptr;
6488                         log = s->log;
6489                 } else if (s == NULL)
6490                         action = pf_test_rule(&r, &s, dir, kif, m, off, &pd,
6491                             &a, &ruleset, inp);
6492                 break;
6493         }
6494
6495 done:
6496         PF_RULES_RUNLOCK();
6497         if (n != m) {
6498                 m_freem(n);
6499                 n = NULL;
6500         }
6501
6502         /* handle dangerous IPv6 extension headers. */
6503         if (action == PF_PASS && rh_cnt &&
6504             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
6505                 action = PF_DROP;
6506                 REASON_SET(&reason, PFRES_IPOPTIONS);
6507                 log = r->log;
6508                 DPFPRINTF(PF_DEBUG_MISC,
6509                     ("pf: dropping packet with dangerous v6 headers\n"));
6510         }
6511
6512         if (s && s->tag > 0 && pf_tag_packet(m, &pd, s->tag)) {
6513                 action = PF_DROP;
6514                 REASON_SET(&reason, PFRES_MEMORY);
6515         }
6516         if (r->rtableid >= 0)
6517                 M_SETFIB(m, r->rtableid);
6518
6519         if (r->scrub_flags & PFSTATE_SETPRIO) {
6520                 if (pd.tos & IPTOS_LOWDELAY)
6521                         pqid = 1;
6522                 if (pf_ieee8021q_setpcp(m, r->set_prio[pqid])) {
6523                         action = PF_DROP;
6524                         REASON_SET(&reason, PFRES_MEMORY);
6525                         log = 1;
6526                         DPFPRINTF(PF_DEBUG_MISC,
6527                             ("pf: failed to allocate 802.1q mtag\n"));
6528                 }
6529         }
6530
6531 #ifdef ALTQ
6532         if (action == PF_PASS && r->qid) {
6533                 if (pd.pf_mtag == NULL &&
6534                     ((pd.pf_mtag = pf_get_mtag(m)) == NULL)) {
6535                         action = PF_DROP;
6536                         REASON_SET(&reason, PFRES_MEMORY);
6537                 } else {
6538                         if (s != NULL)
6539                                 pd.pf_mtag->qid_hash = pf_state_hash(s);
6540                         if (pd.tos & IPTOS_LOWDELAY)
6541                                 pd.pf_mtag->qid = r->pqid;
6542                         else
6543                                 pd.pf_mtag->qid = r->qid;
6544                         /* Add hints for ecn. */
6545                         pd.pf_mtag->hdr = h;
6546                 }
6547         }
6548 #endif /* ALTQ */
6549
6550         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
6551             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
6552             (s->nat_rule.ptr->action == PF_RDR ||
6553             s->nat_rule.ptr->action == PF_BINAT) &&
6554             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
6555                 m->m_flags |= M_SKIP_FIREWALL;
6556
6557         /* XXX: Anybody working on it?! */
6558         if (r->divert.port)
6559                 printf("pf: divert(9) is not supported for IPv6\n");
6560
6561         if (log) {
6562                 struct pf_rule *lr;
6563
6564                 if (s != NULL && s->nat_rule.ptr != NULL &&
6565                     s->nat_rule.ptr->log & PF_LOG_ALL)
6566                         lr = s->nat_rule.ptr;
6567                 else
6568                         lr = r;
6569                 PFLOG_PACKET(kif, m, AF_INET6, dir, reason, lr, a, ruleset,
6570                     &pd, (s == NULL));
6571         }
6572
6573         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
6574         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
6575
6576         if (action == PF_PASS || r->action == PF_DROP) {
6577                 dirndx = (dir == PF_OUT);
6578                 r->packets[dirndx]++;
6579                 r->bytes[dirndx] += pd.tot_len;
6580                 if (a != NULL) {
6581                         a->packets[dirndx]++;
6582                         a->bytes[dirndx] += pd.tot_len;
6583                 }
6584                 if (s != NULL) {
6585                         if (s->nat_rule.ptr != NULL) {
6586                                 s->nat_rule.ptr->packets[dirndx]++;
6587                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
6588                         }
6589                         if (s->src_node != NULL) {
6590                                 s->src_node->packets[dirndx]++;
6591                                 s->src_node->bytes[dirndx] += pd.tot_len;
6592                         }
6593                         if (s->nat_src_node != NULL) {
6594                                 s->nat_src_node->packets[dirndx]++;
6595                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
6596                         }
6597                         dirndx = (dir == s->direction) ? 0 : 1;
6598                         s->packets[dirndx]++;
6599                         s->bytes[dirndx] += pd.tot_len;
6600                 }
6601                 tr = r;
6602                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
6603                 if (nr != NULL && r == &V_pf_default_rule)
6604                         tr = nr;
6605                 if (tr->src.addr.type == PF_ADDR_TABLE)
6606                         pfr_update_stats(tr->src.addr.p.tbl,
6607                             (s == NULL) ? pd.src :
6608                             &s->key[(s->direction == PF_IN)]->addr[0],
6609                             pd.af, pd.tot_len, dir == PF_OUT,
6610                             r->action == PF_PASS, tr->src.neg);
6611                 if (tr->dst.addr.type == PF_ADDR_TABLE)
6612                         pfr_update_stats(tr->dst.addr.p.tbl,
6613                             (s == NULL) ? pd.dst :
6614                             &s->key[(s->direction == PF_IN)]->addr[1],
6615                             pd.af, pd.tot_len, dir == PF_OUT,
6616                             r->action == PF_PASS, tr->dst.neg);
6617         }
6618
6619         switch (action) {
6620         case PF_SYNPROXY_DROP:
6621                 m_freem(*m0);
6622         case PF_DEFER:
6623                 *m0 = NULL;
6624                 action = PF_PASS;
6625                 break;
6626         case PF_DROP:
6627                 m_freem(*m0);
6628                 *m0 = NULL;
6629                 break;
6630         default:
6631                 /* pf_route6() returns unlocked. */
6632                 if (r->rt) {
6633                         pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
6634                         return (action);
6635                 }
6636                 break;
6637         }
6638
6639         if (s)
6640                 PF_STATE_UNLOCK(s);
6641
6642         /* If reassembled packet passed, create new fragments. */
6643         if (action == PF_PASS && *m0 && (pflags & PFIL_FWD) &&
6644             (mtag = m_tag_find(m, PF_REASSEMBLED, NULL)) != NULL)
6645                 action = pf_refragment6(ifp, m0, mtag);
6646
6647         return (action);
6648 }
6649 #endif /* INET6 */