The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/pf/pf.c

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    1 /*      $OpenBSD: pf.c,v 1.614 2008/08/02 12:34:37 henning Exp $ */
    2 
    3 /*
    4  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
    5  *
    6  * Copyright (c) 2001 Daniel Hartmeier
    7  * Copyright (c) 2002 - 2008 Henning Brauer
    8  * All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  *
   14  *    - Redistributions of source code must retain the above copyright
   15  *      notice, this list of conditions and the following disclaimer.
   16  *    - Redistributions in binary form must reproduce the above
   17  *      copyright notice, this list of conditions and the following
   18  *      disclaimer in the documentation and/or other materials provided
   19  *      with the distribution.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   29  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32  * POSSIBILITY OF SUCH DAMAGE.
   33  *
   34  * Effort sponsored in part by the Defense Advanced Research Projects
   35  * Agency (DARPA) and Air Force Research Laboratory, Air Force
   36  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
   37  *
   38  */
   39 
   40 #include "opt_inet.h"
   41 #include "opt_inet6.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/filio.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/kernel.h>
   51 #include <sys/time.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/endian.h>
   54 #include <sys/proc.h>
   55 #include <sys/kthread.h>
   56 
   57 #include <machine/inttypes.h>
   58 
   59 #include <sys/md5.h>
   60 
   61 #include <net/if.h>
   62 #include <net/if_types.h>
   63 #include <net/bpf.h>
   64 #include <net/netisr2.h>
   65 #include <net/route.h>
   66 
   67 #include <netinet/in.h>
   68 #include <netinet/in_var.h>
   69 #include <netinet/in_systm.h>
   70 #include <netinet/ip.h>
   71 #include <netinet/ip_var.h>
   72 #include <netinet/tcp.h>
   73 #include <netinet/tcp_seq.h>
   74 #include <netinet/udp.h>
   75 #include <netinet/ip_icmp.h>
   76 #include <netinet/in_pcb.h>
   77 #include <netinet/tcp_timer.h>
   78 #include <netinet/tcp_var.h>
   79 #include <netinet/udp_var.h>
   80 #include <netinet/icmp_var.h>
   81 #include <netinet/if_ether.h>
   82 
   83 #include <net/pf/pfvar.h>
   84 #include <net/pf/if_pflog.h>
   85 
   86 #include <net/pf/if_pfsync.h>
   87 
   88 #ifdef INET6
   89 #include <netinet/ip6.h>
   90 #include <netinet/icmp6.h>
   91 #include <netinet6/nd6.h>
   92 #include <netinet6/ip6_var.h>
   93 #include <netinet6/in6_pcb.h>
   94 #endif /* INET6 */
   95 
   96 #include <sys/in_cksum.h>
   97 #include <sys/ucred.h>
   98 #include <machine/limits.h>
   99 #include <sys/msgport2.h>
  100 #include <net/netmsg2.h>
  101 
  102 extern int ip_optcopy(struct ip *, struct ip *);
  103 extern int debug_pfugidhack;
  104 
  105 struct lwkt_token pf_token = LWKT_TOKEN_INITIALIZER(pf_token);
  106 
  107 #define DPFPRINTF(n, x) if (pf_status.debug >= (n)) kprintf x
  108 
  109 /*
  110  * Global variables
  111  */
  112 
  113 /* mask radix tree */
  114 struct radix_node_head  *pf_maskhead;
  115 
  116 /* state tables */
  117 struct pf_state_tree     pf_statetbl;
  118 
  119 struct pf_altqqueue      pf_altqs[2];
  120 struct pf_palist         pf_pabuf;
  121 struct pf_altqqueue     *pf_altqs_active;
  122 struct pf_altqqueue     *pf_altqs_inactive;
  123 struct pf_status         pf_status;
  124 
  125 u_int32_t                ticket_altqs_active;
  126 u_int32_t                ticket_altqs_inactive;
  127 int                      altqs_inactive_open;
  128 u_int32_t                ticket_pabuf;
  129 
  130 MD5_CTX                  pf_tcp_secret_ctx;
  131 u_char                   pf_tcp_secret[16];
  132 int                      pf_tcp_secret_init;
  133 int                      pf_tcp_iss_off;
  134 
  135 struct pf_anchor_stackframe {
  136         struct pf_ruleset                       *rs;
  137         struct pf_rule                          *r;
  138         struct pf_anchor_node                   *parent;
  139         struct pf_anchor                        *child;
  140 } pf_anchor_stack[64];
  141 
  142 struct malloc_type       *pf_src_tree_pl, *pf_rule_pl, *pf_pooladdr_pl;
  143 struct malloc_type       *pf_state_pl, *pf_state_key_pl, *pf_state_item_pl;
  144 struct malloc_type       *pf_altq_pl;
  145 
  146 void                     pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
  147 
  148 void                     pf_init_threshold(struct pf_threshold *, u_int32_t,
  149                             u_int32_t);
  150 void                     pf_add_threshold(struct pf_threshold *);
  151 int                      pf_check_threshold(struct pf_threshold *);
  152 
  153 void                     pf_change_ap(struct pf_addr *, u_int16_t *,
  154                             u_int16_t *, u_int16_t *, struct pf_addr *,
  155                             u_int16_t, u_int8_t, sa_family_t);
  156 int                      pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
  157                             struct tcphdr *, struct pf_state_peer *);
  158 #ifdef INET6
  159 void                     pf_change_a6(struct pf_addr *, u_int16_t *,
  160                             struct pf_addr *, u_int8_t);
  161 #endif /* INET6 */
  162 void                     pf_change_icmp(struct pf_addr *, u_int16_t *,
  163                             struct pf_addr *, struct pf_addr *, u_int16_t,
  164                             u_int16_t *, u_int16_t *, u_int16_t *,
  165                             u_int16_t *, u_int8_t, sa_family_t);
  166 void                     pf_send_tcp(const struct pf_rule *, sa_family_t,
  167                             const struct pf_addr *, const struct pf_addr *,
  168                             u_int16_t, u_int16_t, u_int32_t, u_int32_t,
  169                             u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
  170                             u_int16_t, struct ether_header *, struct ifnet *);
  171 void                     pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
  172                             sa_family_t, struct pf_rule *);
  173 struct pf_rule          *pf_match_translation(struct pf_pdesc *, struct mbuf *,
  174                             int, int, struct pfi_kif *,
  175                             struct pf_addr *, u_int16_t, struct pf_addr *,
  176                             u_int16_t, int);
  177 struct pf_rule          *pf_get_translation(struct pf_pdesc *, struct mbuf *,
  178                             int, int, struct pfi_kif *, struct pf_src_node **,
  179                             struct pf_state_key **, struct pf_state_key **,
  180                             struct pf_state_key **, struct pf_state_key **,
  181                             struct pf_addr *, struct pf_addr *,
  182                             u_int16_t, u_int16_t);
  183 void                     pf_detach_state(struct pf_state *);
  184 int                      pf_state_key_setup(struct pf_pdesc *, struct pf_rule *,
  185                             struct pf_state_key **, struct pf_state_key **,
  186                             struct pf_state_key **, struct pf_state_key **,
  187                             struct pf_addr *, struct pf_addr *,
  188                             u_int16_t, u_int16_t);
  189 void                     pf_state_key_detach(struct pf_state *, int);
  190 u_int32_t                pf_tcp_iss(struct pf_pdesc *);
  191 int                      pf_test_rule(struct pf_rule **, struct pf_state **,
  192                             int, struct pfi_kif *, struct mbuf *, int,
  193                             void *, struct pf_pdesc *, struct pf_rule **,
  194                             struct pf_ruleset **, struct ifqueue *, struct inpcb *);
  195 static __inline int      pf_create_state(struct pf_rule *, struct pf_rule *,
  196                             struct pf_rule *, struct pf_pdesc *,
  197                             struct pf_src_node *, struct pf_state_key *,
  198                             struct pf_state_key *, struct pf_state_key *,
  199                             struct pf_state_key *, struct mbuf *, int,
  200                             u_int16_t, u_int16_t, int *, struct pfi_kif *,
  201                             struct pf_state **, int, u_int16_t, u_int16_t,
  202                             int);
  203 int                      pf_test_fragment(struct pf_rule **, int,
  204                             struct pfi_kif *, struct mbuf *, void *,
  205                             struct pf_pdesc *, struct pf_rule **,
  206                             struct pf_ruleset **);
  207 int                      pf_tcp_track_full(struct pf_state_peer *,
  208                             struct pf_state_peer *, struct pf_state **,
  209                             struct pfi_kif *, struct mbuf *, int,
  210                             struct pf_pdesc *, u_short *, int *);
  211 int                     pf_tcp_track_sloppy(struct pf_state_peer *,
  212                             struct pf_state_peer *, struct pf_state **,
  213                             struct pf_pdesc *, u_short *);
  214 int                      pf_test_state_tcp(struct pf_state **, int,
  215                             struct pfi_kif *, struct mbuf *, int,
  216                             void *, struct pf_pdesc *, u_short *);
  217 int                      pf_test_state_udp(struct pf_state **, int,
  218                             struct pfi_kif *, struct mbuf *, int,
  219                             void *, struct pf_pdesc *);
  220 int                      pf_test_state_icmp(struct pf_state **, int,
  221                             struct pfi_kif *, struct mbuf *, int,
  222                             void *, struct pf_pdesc *, u_short *);
  223 int                      pf_test_state_other(struct pf_state **, int,
  224                             struct pfi_kif *, struct mbuf *, struct pf_pdesc *);
  225 void                     pf_step_into_anchor(int *, struct pf_ruleset **, int,
  226                             struct pf_rule **, struct pf_rule **, int *);
  227 int                      pf_step_out_of_anchor(int *, struct pf_ruleset **,
  228                              int, struct pf_rule **, struct pf_rule **,
  229                              int *);
  230 void                     pf_hash(struct pf_addr *, struct pf_addr *,
  231                             struct pf_poolhashkey *, sa_family_t);
  232 int                      pf_map_addr(u_int8_t, struct pf_rule *,
  233                             struct pf_addr *, struct pf_addr *,
  234                             struct pf_addr *, struct pf_src_node **);
  235 int                      pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
  236                             struct pf_addr *, struct pf_addr *, u_int16_t,
  237                             struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t,
  238                             struct pf_src_node **);
  239 void                     pf_route(struct mbuf **, struct pf_rule *, int,
  240                             struct ifnet *, struct pf_state *,
  241                             struct pf_pdesc *);
  242 void                     pf_route6(struct mbuf **, struct pf_rule *, int,
  243                             struct ifnet *, struct pf_state *,
  244                             struct pf_pdesc *);
  245 u_int8_t                 pf_get_wscale(struct mbuf *, int, u_int16_t,
  246                             sa_family_t);
  247 u_int16_t                pf_get_mss(struct mbuf *, int, u_int16_t,
  248                             sa_family_t);
  249 u_int16_t                pf_calc_mss(struct pf_addr *, sa_family_t,
  250                                 u_int16_t);
  251 void                     pf_set_rt_ifp(struct pf_state *,
  252                             struct pf_addr *);
  253 int                      pf_check_proto_cksum(struct mbuf *, int, int,
  254                             u_int8_t, sa_family_t);
  255 struct pf_divert        *pf_get_divert(struct mbuf *);
  256 void                     pf_print_state_parts(struct pf_state *,
  257                             struct pf_state_key *, struct pf_state_key *);
  258 int                      pf_addr_wrap_neq(struct pf_addr_wrap *,
  259                             struct pf_addr_wrap *);
  260 struct pf_state         *pf_find_state(struct pfi_kif *,
  261                             struct pf_state_key_cmp *, u_int, struct mbuf *);
  262 int                      pf_src_connlimit(struct pf_state **);
  263 int                      pf_check_congestion(struct ifqueue *);
  264 
  265 extern int pf_end_threads;
  266 
  267 struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
  268         { &pf_state_pl, PFSTATE_HIWAT },
  269         { &pf_src_tree_pl, PFSNODE_HIWAT },
  270         { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
  271         { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
  272         { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
  273 };
  274 
  275 #define STATE_LOOKUP(i, k, d, s, m)                                     \
  276         do {                                                            \
  277                 s = pf_find_state(i, k, d, m);                  \
  278                 if (s == NULL || (s)->timeout == PFTM_PURGE)            \
  279                         return (PF_DROP);                               \
  280                 if (d == PF_OUT &&                                      \
  281                     (((s)->rule.ptr->rt == PF_ROUTETO &&                \
  282                     (s)->rule.ptr->direction == PF_OUT) ||              \
  283                     ((s)->rule.ptr->rt == PF_REPLYTO &&                 \
  284                     (s)->rule.ptr->direction == PF_IN)) &&              \
  285                     (s)->rt_kif != NULL &&                              \
  286                     (s)->rt_kif != i)                                   \
  287                         return (PF_PASS);                               \
  288         } while (0)
  289 
  290 #define BOUND_IFACE(r, k) \
  291         ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
  292 
  293 #define STATE_INC_COUNTERS(s)                           \
  294         do {                                            \
  295                 s->rule.ptr->states_cur++;              \
  296                 s->rule.ptr->states_tot++;              \
  297                 if (s->anchor.ptr != NULL) {            \
  298                         s->anchor.ptr->states_cur++;    \
  299                         s->anchor.ptr->states_tot++;    \
  300                 }                                       \
  301                 if (s->nat_rule.ptr != NULL) {          \
  302                         s->nat_rule.ptr->states_cur++;  \
  303                         s->nat_rule.ptr->states_tot++;  \
  304                 }                                       \
  305         } while (0)
  306 
  307 #define STATE_DEC_COUNTERS(s)                           \
  308         do {                                            \
  309                 if (s->nat_rule.ptr != NULL)            \
  310                         s->nat_rule.ptr->states_cur--;  \
  311                 if (s->anchor.ptr != NULL)              \
  312                         s->anchor.ptr->states_cur--;    \
  313                 s->rule.ptr->states_cur--;              \
  314         } while (0)
  315 
  316 static MALLOC_DEFINE(M_PFSTATEPL, "pfstatepl", "pf state pool list");
  317 static MALLOC_DEFINE(M_PFSRCTREEPL, "pfsrctpl", "pf source tree pool list");
  318 static MALLOC_DEFINE(M_PFSTATEKEYPL, "pfstatekeypl", "pf state key pool list");
  319 static MALLOC_DEFINE(M_PFSTATEITEMPL, "pfstateitempl", "pf state item pool list");
  320 
  321 static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
  322 static __inline int pf_state_compare_key(struct pf_state_key *,
  323         struct pf_state_key *);
  324 static __inline int pf_state_compare_id(struct pf_state *,
  325         struct pf_state *);
  326 
  327 struct pf_src_tree tree_src_tracking;
  328 
  329 struct pf_state_tree_id tree_id;
  330 struct pf_state_queue state_list;
  331 
  332 RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
  333 RB_GENERATE(pf_state_tree, pf_state_key, entry, pf_state_compare_key);
  334 RB_GENERATE(pf_state_tree_id, pf_state,
  335     entry_id, pf_state_compare_id);
  336 
  337 static __inline int
  338 pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
  339 {
  340         int     diff;
  341 
  342         if (a->rule.ptr > b->rule.ptr)
  343                 return (1);
  344         if (a->rule.ptr < b->rule.ptr)
  345                 return (-1);
  346         if ((diff = a->af - b->af) != 0)
  347                 return (diff);
  348         switch (a->af) {
  349 #ifdef INET
  350         case AF_INET:
  351                 if (a->addr.addr32[0] > b->addr.addr32[0])
  352                         return (1);
  353                 if (a->addr.addr32[0] < b->addr.addr32[0])
  354                         return (-1);
  355                 break;
  356 #endif /* INET */
  357 #ifdef INET6
  358         case AF_INET6:
  359                 if (a->addr.addr32[3] > b->addr.addr32[3])
  360                         return (1);
  361                 if (a->addr.addr32[3] < b->addr.addr32[3])
  362                         return (-1);
  363                 if (a->addr.addr32[2] > b->addr.addr32[2])
  364                         return (1);
  365                 if (a->addr.addr32[2] < b->addr.addr32[2])
  366                         return (-1);
  367                 if (a->addr.addr32[1] > b->addr.addr32[1])
  368                         return (1);
  369                 if (a->addr.addr32[1] < b->addr.addr32[1])
  370                         return (-1);
  371                 if (a->addr.addr32[0] > b->addr.addr32[0])
  372                         return (1);
  373                 if (a->addr.addr32[0] < b->addr.addr32[0])
  374                         return (-1);
  375                 break;
  376 #endif /* INET6 */
  377         }
  378         return (0);
  379 }
  380 
  381 u_int32_t
  382 pf_state_hash(struct pf_state_key *sk)
  383 {
  384         u_int32_t hv = (u_int32_t)(((intptr_t)sk >> 6) ^ ((intptr_t)sk >> 15));
  385         if (hv == 0)    /* disallow 0 */
  386                 hv = 1;
  387         return(hv);
  388 }
  389 
  390 #ifdef INET6
  391 void
  392 pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
  393 {
  394         switch (af) {
  395 #ifdef INET
  396         case AF_INET:
  397                 dst->addr32[0] = src->addr32[0];
  398                 break;
  399 #endif /* INET */
  400         case AF_INET6:
  401                 dst->addr32[0] = src->addr32[0];
  402                 dst->addr32[1] = src->addr32[1];
  403                 dst->addr32[2] = src->addr32[2];
  404                 dst->addr32[3] = src->addr32[3];
  405                 break;
  406         }
  407 }
  408 #endif /* INET6 */
  409 
  410 void
  411 pf_init_threshold(struct pf_threshold *threshold,
  412     u_int32_t limit, u_int32_t seconds)
  413 {
  414         threshold->limit = limit * PF_THRESHOLD_MULT;
  415         threshold->seconds = seconds;
  416         threshold->count = 0;
  417         threshold->last = time_second;
  418 }
  419 
  420 void
  421 pf_add_threshold(struct pf_threshold *threshold)
  422 {
  423         u_int32_t t = time_second, diff = t - threshold->last;
  424 
  425         if (diff >= threshold->seconds)
  426                 threshold->count = 0;
  427         else
  428                 threshold->count -= threshold->count * diff /
  429                     threshold->seconds;
  430         threshold->count += PF_THRESHOLD_MULT;
  431         threshold->last = t;
  432 }
  433 
  434 int
  435 pf_check_threshold(struct pf_threshold *threshold)
  436 {
  437         return (threshold->count > threshold->limit);
  438 }
  439 
  440 int
  441 pf_src_connlimit(struct pf_state **state)
  442 {
  443         int bad = 0;
  444 
  445         (*state)->src_node->conn++;
  446         (*state)->src.tcp_est = 1;
  447         pf_add_threshold(&(*state)->src_node->conn_rate);
  448 
  449         if ((*state)->rule.ptr->max_src_conn &&
  450             (*state)->rule.ptr->max_src_conn <
  451             (*state)->src_node->conn) {
  452                 pf_status.lcounters[LCNT_SRCCONN]++;
  453                 bad++;
  454         }
  455 
  456         if ((*state)->rule.ptr->max_src_conn_rate.limit &&
  457             pf_check_threshold(&(*state)->src_node->conn_rate)) {
  458                 pf_status.lcounters[LCNT_SRCCONNRATE]++;
  459                 bad++;
  460         }
  461 
  462         if (!bad)
  463                 return (0);
  464 
  465         if ((*state)->rule.ptr->overload_tbl) {
  466                 struct pfr_addr p;
  467                 u_int32_t       killed = 0;
  468 
  469                 pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
  470                 if (pf_status.debug >= PF_DEBUG_MISC) {
  471                         kprintf("pf_src_connlimit: blocking address ");
  472                         pf_print_host(&(*state)->src_node->addr, 0,
  473                             (*state)->key[PF_SK_WIRE]->af);
  474                 }
  475 
  476                 bzero(&p, sizeof(p));
  477                 p.pfra_af = (*state)->key[PF_SK_WIRE]->af;
  478                 switch ((*state)->key[PF_SK_WIRE]->af) {
  479 #ifdef INET
  480                 case AF_INET:
  481                         p.pfra_net = 32;
  482                         p.pfra_ip4addr = (*state)->src_node->addr.v4;
  483                         break;
  484 #endif /* INET */
  485 #ifdef INET6
  486                 case AF_INET6:
  487                         p.pfra_net = 128;
  488                         p.pfra_ip6addr = (*state)->src_node->addr.v6;
  489                         break;
  490 #endif /* INET6 */
  491                 }
  492 
  493                 pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
  494                     &p, time_second);
  495 
  496                 /* kill existing states if that's required. */
  497                 if ((*state)->rule.ptr->flush) {
  498                         struct pf_state_key *sk;
  499                         struct pf_state *st;
  500 
  501                         pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
  502                         RB_FOREACH(st, pf_state_tree_id, &tree_id) {
  503                                 sk = st->key[PF_SK_WIRE];
  504                                 /*
  505                                  * Kill states from this source.  (Only those
  506                                  * from the same rule if PF_FLUSH_GLOBAL is not
  507                                  * set)
  508                                  */
  509                                 if (sk->af ==
  510                                     (*state)->key[PF_SK_WIRE]->af &&
  511                                     (((*state)->direction == PF_OUT &&
  512                                     PF_AEQ(&(*state)->src_node->addr,
  513                                         &sk->addr[0], sk->af)) ||
  514                                     ((*state)->direction == PF_IN &&
  515                                     PF_AEQ(&(*state)->src_node->addr,
  516                                         &sk->addr[1], sk->af))) &&
  517                                     ((*state)->rule.ptr->flush &
  518                                     PF_FLUSH_GLOBAL ||
  519                                     (*state)->rule.ptr == st->rule.ptr)) {
  520                                         st->timeout = PFTM_PURGE;
  521                                         st->src.state = st->dst.state =
  522                                             TCPS_CLOSED;
  523                                         killed++;
  524                                 }
  525                         }
  526                         if (pf_status.debug >= PF_DEBUG_MISC)
  527                                 kprintf(", %u states killed", killed);
  528                 }
  529                 if (pf_status.debug >= PF_DEBUG_MISC)
  530                         kprintf("\n");
  531         }
  532 
  533         /* kill this state */
  534         (*state)->timeout = PFTM_PURGE;
  535         (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
  536         return (1);
  537 }
  538 
  539 int
  540 pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
  541     struct pf_addr *src, sa_family_t af)
  542 {
  543         struct pf_src_node      k;
  544 
  545         if (*sn == NULL) {
  546                 k.af = af;
  547                 PF_ACPY(&k.addr, src, af);
  548                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
  549                     rule->rpool.opts & PF_POOL_STICKYADDR)
  550                         k.rule.ptr = rule;
  551                 else
  552                         k.rule.ptr = NULL;
  553                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
  554                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
  555         }
  556         if (*sn == NULL) {
  557                 if (!rule->max_src_nodes ||
  558                     rule->src_nodes < rule->max_src_nodes)
  559                         (*sn) = kmalloc(sizeof(struct pf_src_node), M_PFSRCTREEPL, M_NOWAIT|M_ZERO);
  560                 else
  561                         pf_status.lcounters[LCNT_SRCNODES]++;
  562                 if ((*sn) == NULL)
  563                         return (-1);
  564 
  565                 pf_init_threshold(&(*sn)->conn_rate,
  566                     rule->max_src_conn_rate.limit,
  567                     rule->max_src_conn_rate.seconds);
  568 
  569                 (*sn)->af = af;
  570                 if (rule->rule_flag & PFRULE_RULESRCTRACK ||
  571                     rule->rpool.opts & PF_POOL_STICKYADDR)
  572                         (*sn)->rule.ptr = rule;
  573                 else
  574                         (*sn)->rule.ptr = NULL;
  575                 PF_ACPY(&(*sn)->addr, src, af);
  576                 if (RB_INSERT(pf_src_tree,
  577                     &tree_src_tracking, *sn) != NULL) {
  578                         if (pf_status.debug >= PF_DEBUG_MISC) {
  579                                 kprintf("pf: src_tree insert failed: ");
  580                                 pf_print_host(&(*sn)->addr, 0, af);
  581                                 kprintf("\n");
  582                         }
  583                         kfree(*sn, M_PFSRCTREEPL);
  584                         return (-1);
  585                 }
  586                 (*sn)->creation = time_second;
  587                 (*sn)->ruletype = rule->action;
  588                 if ((*sn)->rule.ptr != NULL)
  589                         (*sn)->rule.ptr->src_nodes++;
  590                 pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
  591                 pf_status.src_nodes++;
  592         } else {
  593                 if (rule->max_src_states &&
  594                     (*sn)->states >= rule->max_src_states) {
  595                         pf_status.lcounters[LCNT_SRCSTATES]++;
  596                         return (-1);
  597                 }
  598         }
  599         return (0);
  600 }
  601 
  602 /* state table stuff */
  603 
  604 static __inline int
  605 pf_state_compare_key(struct pf_state_key *a, struct pf_state_key *b)
  606 {
  607         int     diff;
  608 
  609         if ((diff = a->proto - b->proto) != 0)
  610                 return (diff);
  611         if ((diff = a->af - b->af) != 0)
  612                 return (diff);
  613         switch (a->af) {
  614 #ifdef INET
  615         case AF_INET:
  616                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
  617                         return (1);
  618                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
  619                         return (-1);
  620                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
  621                         return (1);
  622                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
  623                         return (-1);
  624                 break;
  625 #endif /* INET */
  626 #ifdef INET6
  627         case AF_INET6:
  628                 if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
  629                         return (1);
  630                 if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
  631                         return (-1);
  632                 if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
  633                         return (1);
  634                 if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
  635                         return (-1);
  636                 if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
  637                         return (1);
  638                 if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
  639                         return (-1);
  640                 if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
  641                         return (1);
  642                 if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
  643                         return (-1);
  644                 if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
  645                         return (1);
  646                 if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
  647                         return (-1);
  648                 if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
  649                         return (1);
  650                 if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
  651                         return (-1);
  652                 if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
  653                         return (1);
  654                 if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
  655                         return (-1);
  656                 if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
  657                         return (1);
  658                 if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
  659                         return (-1);
  660                 break;
  661 #endif /* INET6 */
  662         }
  663 
  664         if ((diff = a->port[0] - b->port[0]) != 0)
  665                 return (diff);
  666         if ((diff = a->port[1] - b->port[1]) != 0)
  667                 return (diff);
  668 
  669         return (0);
  670 }
  671 
  672 static __inline int
  673 pf_state_compare_id(struct pf_state *a, struct pf_state *b)
  674 {
  675         if (a->id > b->id)
  676                 return (1);
  677         if (a->id < b->id)
  678                 return (-1);
  679         if (a->creatorid > b->creatorid)
  680                 return (1);
  681         if (a->creatorid < b->creatorid)
  682                 return (-1);
  683 
  684         return (0);
  685 }
  686 
  687 int
  688 pf_state_key_attach(struct pf_state_key *sk, struct pf_state *s, int idx)
  689 {
  690         struct pf_state_item    *si;
  691         struct pf_state_key     *cur;
  692 
  693         KKASSERT(s->key[idx] == NULL);  /* XXX handle this? */
  694 
  695         if ((cur = RB_INSERT(pf_state_tree, &pf_statetbl, sk)) != NULL) {
  696                 /* key exists. check for same kif, if none, add to key */
  697                 TAILQ_FOREACH(si, &cur->states, entry)
  698                         if (si->s->kif == s->kif &&
  699                             si->s->direction == s->direction) {
  700                                 if (pf_status.debug >= PF_DEBUG_MISC) {
  701                                         kprintf(
  702                                             "pf: %s key attach failed on %s: ",
  703                                             (idx == PF_SK_WIRE) ?
  704                                             "wire" : "stack",
  705                                             s->kif->pfik_name);
  706                                         pf_print_state_parts(s,
  707                                             (idx == PF_SK_WIRE) ? sk : NULL,
  708                                             (idx == PF_SK_STACK) ? sk : NULL);
  709                                         kprintf("\n");
  710                                 }
  711                                 kfree(sk, M_PFSTATEKEYPL);
  712                                 return (-1);    /* collision! */
  713                         }
  714                 kfree(sk, M_PFSTATEKEYPL);
  715 
  716                 s->key[idx] = cur;
  717         } else
  718                 s->key[idx] = sk;
  719 
  720         if ((si = kmalloc(sizeof(struct pf_state_item), M_PFSTATEITEMPL, M_NOWAIT)) == NULL) {
  721                 pf_state_key_detach(s, idx);
  722                 return (-1);
  723         }
  724         si->s = s;
  725 
  726         /* list is sorted, if-bound states before floating */
  727         if (s->kif == pfi_all)
  728                 TAILQ_INSERT_TAIL(&s->key[idx]->states, si, entry);
  729         else
  730                 TAILQ_INSERT_HEAD(&s->key[idx]->states, si, entry);
  731         return (0);
  732 }
  733 
  734 void
  735 pf_detach_state(struct pf_state *s)
  736 {
  737         if (s->key[PF_SK_WIRE] == s->key[PF_SK_STACK])
  738                 s->key[PF_SK_WIRE] = NULL;
  739 
  740         if (s->key[PF_SK_STACK] != NULL)
  741                 pf_state_key_detach(s, PF_SK_STACK);
  742 
  743         if (s->key[PF_SK_WIRE] != NULL)
  744                 pf_state_key_detach(s, PF_SK_WIRE);
  745 }
  746 
  747 void
  748 pf_state_key_detach(struct pf_state *s, int idx)
  749 {
  750         struct pf_state_item    *si;
  751         si = TAILQ_FIRST(&s->key[idx]->states);
  752         while (si && si->s != s)
  753             si = TAILQ_NEXT(si, entry);
  754 
  755         if (si) {
  756                 TAILQ_REMOVE(&s->key[idx]->states, si, entry);
  757                 kfree(si, M_PFSTATEITEMPL);
  758         }
  759 
  760         if (TAILQ_EMPTY(&s->key[idx]->states)) {
  761                 RB_REMOVE(pf_state_tree, &pf_statetbl, s->key[idx]);
  762                 if (s->key[idx]->reverse)
  763                         s->key[idx]->reverse->reverse = NULL;
  764                 if (s->key[idx]->inp)
  765                         s->key[idx]->inp->inp_pf_sk = NULL;
  766                 kfree(s->key[idx], M_PFSTATEKEYPL);
  767         }
  768         s->key[idx] = NULL;
  769 }
  770 
  771 struct pf_state_key *
  772 pf_alloc_state_key(int pool_flags)
  773 {
  774         struct pf_state_key     *sk;
  775 
  776         if ((sk = kmalloc(sizeof(struct pf_state_key), M_PFSTATEKEYPL, pool_flags)) == NULL)
  777                         return (NULL);
  778         TAILQ_INIT(&sk->states);
  779 
  780         return (sk);
  781 }
  782 
  783 int
  784 pf_state_key_setup(struct pf_pdesc *pd, struct pf_rule *nr,
  785         struct pf_state_key **skw, struct pf_state_key **sks,
  786         struct pf_state_key **skp, struct pf_state_key **nkp,
  787         struct pf_addr *saddr, struct pf_addr *daddr,
  788         u_int16_t sport, u_int16_t dport)
  789 {
  790         KKASSERT((*skp == NULL && *nkp == NULL));
  791 
  792         if ((*skp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
  793                 return (ENOMEM);
  794 
  795         PF_ACPY(&(*skp)->addr[pd->sidx], saddr, pd->af);
  796         PF_ACPY(&(*skp)->addr[pd->didx], daddr, pd->af);
  797         (*skp)->port[pd->sidx] = sport;
  798         (*skp)->port[pd->didx] = dport;
  799         (*skp)->proto = pd->proto;
  800         (*skp)->af = pd->af;
  801 
  802         if (nr != NULL) {
  803                 if ((*nkp = pf_alloc_state_key(M_NOWAIT | M_ZERO)) == NULL)
  804                         return (ENOMEM); /* caller must handle cleanup */
  805 
  806                 /* XXX maybe just bcopy and TAILQ_INIT(&(*nkp)->states) */
  807                 PF_ACPY(&(*nkp)->addr[0], &(*skp)->addr[0], pd->af);
  808                 PF_ACPY(&(*nkp)->addr[1], &(*skp)->addr[1], pd->af);
  809                 (*nkp)->port[0] = (*skp)->port[0];
  810                 (*nkp)->port[1] = (*skp)->port[1];
  811                 (*nkp)->proto = pd->proto;
  812                 (*nkp)->af = pd->af;
  813         } else
  814                 *nkp = *skp;
  815 
  816         if (pd->dir == PF_IN) {
  817                 *skw = *skp;
  818                 *sks = *nkp;
  819         } else {
  820                 *sks = *skp;
  821                 *skw = *nkp;
  822         }
  823         return (0);
  824 }
  825 
  826 
  827 int
  828 pf_state_insert(struct pfi_kif *kif, struct pf_state_key *skw,
  829     struct pf_state_key *sks, struct pf_state *s)
  830 {
  831         s->kif = kif;
  832 
  833         if (skw == sks) {
  834                 if (pf_state_key_attach(skw, s, PF_SK_WIRE))
  835                         return (-1);
  836                 s->key[PF_SK_STACK] = s->key[PF_SK_WIRE];
  837         } else {
  838                 if (pf_state_key_attach(skw, s, PF_SK_WIRE)) {
  839                         kfree(sks, M_PFSTATEKEYPL);
  840                         return (-1);
  841                 }
  842                 if (pf_state_key_attach(sks, s, PF_SK_STACK)) {
  843                         pf_state_key_detach(s, PF_SK_WIRE);
  844                         return (-1);
  845                 }
  846         }
  847 
  848         if (s->id == 0 && s->creatorid == 0) {
  849                 s->id = htobe64(pf_status.stateid++);
  850                 s->creatorid = pf_status.hostid;
  851         }
  852 
  853         /*
  854          * Calculate hash code for altq
  855          */
  856         s->hash = crc32(s->key[PF_SK_WIRE], sizeof(*sks));
  857 
  858         if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
  859                 if (pf_status.debug >= PF_DEBUG_MISC) {
  860                         kprintf("pf: state insert failed: "
  861                             "id: %016jx creatorid: %08x",
  862                               (uintmax_t)be64toh(s->id), ntohl(s->creatorid));
  863                         if (s->sync_flags & PFSTATE_FROMSYNC)
  864                                 kprintf(" (from sync)");
  865                         kprintf("\n");
  866                 }
  867                 pf_detach_state(s);
  868                 return (-1);
  869         }
  870         TAILQ_INSERT_TAIL(&state_list, s, entry_list);
  871         pf_status.fcounters[FCNT_STATE_INSERT]++;
  872         pf_status.states++;
  873         pfi_kif_ref(kif, PFI_KIF_REF_STATE);
  874         pfsync_insert_state(s);
  875         return (0);
  876 }
  877 
  878 struct pf_state *
  879 pf_find_state_byid(struct pf_state_cmp *key)
  880 {
  881         pf_status.fcounters[FCNT_STATE_SEARCH]++;
  882 
  883         return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
  884 }
  885 
  886 struct pf_state *
  887 pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir,
  888     struct mbuf *m)
  889 {
  890         struct pf_state_key     *sk;
  891         struct pf_state_item    *si;
  892 
  893         pf_status.fcounters[FCNT_STATE_SEARCH]++;
  894 
  895         if (dir == PF_OUT && m->m_pkthdr.pf.statekey &&
  896             ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse)
  897                 sk = ((struct pf_state_key *)m->m_pkthdr.pf.statekey)->reverse;
  898         else {
  899                 if ((sk = RB_FIND(pf_state_tree, &pf_statetbl,
  900                     (struct pf_state_key *)key)) == NULL)
  901                         return (NULL);
  902                 if (dir == PF_OUT && m->m_pkthdr.pf.statekey) {
  903                         ((struct pf_state_key *)
  904                             m->m_pkthdr.pf.statekey)->reverse = sk;
  905                         sk->reverse = m->m_pkthdr.pf.statekey;
  906                 }
  907         }
  908 
  909         if (dir == PF_OUT)
  910                 m->m_pkthdr.pf.statekey = NULL;
  911 
  912         /* list is sorted, if-bound states before floating ones */
  913         TAILQ_FOREACH(si, &sk->states, entry)
  914                 if ((si->s->kif == pfi_all || si->s->kif == kif) &&
  915                     sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
  916                     si->s->key[PF_SK_STACK]))
  917                         return (si->s);
  918 
  919         return (NULL);
  920 }
  921 
  922 struct pf_state *
  923 pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
  924 {
  925         struct pf_state_key     *sk;
  926         struct pf_state_item    *si, *ret = NULL;
  927 
  928         pf_status.fcounters[FCNT_STATE_SEARCH]++;
  929 
  930         sk = RB_FIND(pf_state_tree, &pf_statetbl, (struct pf_state_key *)key);
  931 
  932         if (sk != NULL) {
  933                 TAILQ_FOREACH(si, &sk->states, entry)
  934                         if (dir == PF_INOUT ||
  935                             (sk == (dir == PF_IN ? si->s->key[PF_SK_WIRE] :
  936                             si->s->key[PF_SK_STACK]))) {
  937                                 if (more == NULL)
  938                                         return (si->s);
  939 
  940                                 if (ret)
  941                                         (*more)++;
  942                                 else
  943                                         ret = si;
  944                         }
  945         }
  946         return (ret ? ret->s : NULL);
  947 }
  948 
  949 /* END state table stuff */
  950 
  951 
  952 void
  953 pf_purge_thread(void *v)
  954 {
  955         int nloops = 0;
  956         int locked = 0;
  957 
  958         lwkt_gettoken(&pf_token);
  959         for (;;) {
  960                 tsleep(pf_purge_thread, PWAIT, "pftm", 1 * hz);
  961 
  962                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
  963 
  964                 if (pf_end_threads) {
  965                         pf_purge_expired_states(pf_status.states, 0);
  966                         pf_purge_expired_fragments();
  967                         pf_purge_expired_src_nodes(1);
  968                         pf_end_threads++;
  969 
  970                         lockmgr(&pf_consistency_lock, LK_RELEASE);
  971                         wakeup(pf_purge_thread);
  972                         kthread_exit();
  973                 }
  974                 crit_enter();
  975 
  976                 /* process a fraction of the state table every second */
  977                 if(!pf_purge_expired_states(1 + (pf_status.states
  978                     / pf_default_rule.timeout[PFTM_INTERVAL]), 0)) {
  979 
  980                         pf_purge_expired_states(1 + (pf_status.states
  981                             / pf_default_rule.timeout[PFTM_INTERVAL]), 1);
  982                 }
  983 
  984                 /* purge other expired types every PFTM_INTERVAL seconds */
  985                 if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
  986                         pf_purge_expired_fragments();
  987                         if (!pf_purge_expired_src_nodes(locked)) {
  988                                 pf_purge_expired_src_nodes(1);
  989                         }
  990                         nloops = 0;
  991                 }
  992                 crit_exit();
  993                 lockmgr(&pf_consistency_lock, LK_RELEASE);
  994         }
  995         lwkt_reltoken(&pf_token);
  996 }
  997 
  998 u_int32_t
  999 pf_state_expires(const struct pf_state *state)
 1000 {
 1001         u_int32_t       timeout;
 1002         u_int32_t       start;
 1003         u_int32_t       end;
 1004         u_int32_t       states;
 1005 
 1006         /* handle all PFTM_* > PFTM_MAX here */
 1007         if (state->timeout == PFTM_PURGE)
 1008                 return (time_second);
 1009         if (state->timeout == PFTM_UNTIL_PACKET)
 1010                 return (0);
 1011         KKASSERT(state->timeout != PFTM_UNLINKED);
 1012         KKASSERT(state->timeout < PFTM_MAX);
 1013         timeout = state->rule.ptr->timeout[state->timeout];
 1014         if (!timeout)
 1015                 timeout = pf_default_rule.timeout[state->timeout];
 1016         start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
 1017         if (start) {
 1018                 end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
 1019                 states = state->rule.ptr->states_cur;
 1020         } else {
 1021                 start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
 1022                 end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
 1023                 states = pf_status.states;
 1024         }
 1025         if (end && states > start && start < end) {
 1026                 if (states < end)
 1027                         return (state->expire + timeout * (end - states) /
 1028                             (end - start));
 1029                 else
 1030                         return (time_second);
 1031         }
 1032         return (state->expire + timeout);
 1033 }
 1034 
 1035 int
 1036 pf_purge_expired_src_nodes(int waslocked)
 1037 {
 1038          struct pf_src_node             *cur, *next;
 1039          int                             locked = waslocked;
 1040 
 1041          for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
 1042                  next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
 1043 
 1044                  if (cur->states <= 0 && cur->expire <= time_second) {
 1045                          if (! locked) {
 1046                                  lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
 1047                                  next = RB_NEXT(pf_src_tree,
 1048                                      &tree_src_tracking, cur);
 1049                                  locked = 1;
 1050                          }
 1051                          if (cur->rule.ptr != NULL) {
 1052                                  cur->rule.ptr->src_nodes--;
 1053                                  if (cur->rule.ptr->states_cur <= 0 &&
 1054                                      cur->rule.ptr->max_src_nodes <= 0)
 1055                                          pf_rm_rule(NULL, cur->rule.ptr);
 1056                          }
 1057                          RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
 1058                          pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 1059                          pf_status.src_nodes--;
 1060                          kfree(cur, M_PFSRCTREEPL);
 1061                  }
 1062          }
 1063 
 1064          if (locked && !waslocked)
 1065                 lockmgr(&pf_consistency_lock, LK_RELEASE);
 1066         return(1);
 1067 }
 1068 
 1069 void
 1070 pf_src_tree_remove_state(struct pf_state *s)
 1071 {
 1072         u_int32_t timeout;
 1073 
 1074         if (s->src_node != NULL) {
 1075                 if (s->src.tcp_est)
 1076                         --s->src_node->conn;
 1077                 if (--s->src_node->states <= 0) {
 1078                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 1079                         if (!timeout)
 1080                                 timeout =
 1081                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 1082                         s->src_node->expire = time_second + timeout;
 1083                 }
 1084         }
 1085         if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
 1086                 if (--s->nat_src_node->states <= 0) {
 1087                         timeout = s->rule.ptr->timeout[PFTM_SRC_NODE];
 1088                         if (!timeout)
 1089                                 timeout =
 1090                                     pf_default_rule.timeout[PFTM_SRC_NODE];
 1091                         s->nat_src_node->expire = time_second + timeout;
 1092                 }
 1093         }
 1094         s->src_node = s->nat_src_node = NULL;
 1095 }
 1096 
 1097 /* callers should be at crit_enter() */
 1098 void
 1099 pf_unlink_state(struct pf_state *cur)
 1100 {
 1101         if (cur->src.state == PF_TCPS_PROXY_DST) {
 1102                 /* XXX wire key the right one? */
 1103                 pf_send_tcp(cur->rule.ptr, cur->key[PF_SK_WIRE]->af,
 1104                     &cur->key[PF_SK_WIRE]->addr[1],
 1105                     &cur->key[PF_SK_WIRE]->addr[0],
 1106                     cur->key[PF_SK_WIRE]->port[1],
 1107                     cur->key[PF_SK_WIRE]->port[0],
 1108                     cur->src.seqhi, cur->src.seqlo + 1,
 1109                     TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
 1110         }
 1111         RB_REMOVE(pf_state_tree_id, &tree_id, cur);
 1112         if (cur->creatorid == pf_status.hostid)
 1113                 pfsync_delete_state(cur);
 1114         cur->timeout = PFTM_UNLINKED;
 1115         pf_src_tree_remove_state(cur);
 1116         pf_detach_state(cur);
 1117 }
 1118 
 1119 static struct pf_state  *purge_cur;
 1120 
 1121 /* callers should be at crit_enter() and hold the
 1122  * write_lock on pf_consistency_lock */
 1123 void
 1124 pf_free_state(struct pf_state *cur)
 1125 {
 1126         if (pfsyncif != NULL &&
 1127             (pfsyncif->sc_bulk_send_next == cur ||
 1128             pfsyncif->sc_bulk_terminator == cur))
 1129                 return;
 1130         KKASSERT(cur->timeout == PFTM_UNLINKED);
 1131         if (--cur->rule.ptr->states_cur <= 0 &&
 1132             cur->rule.ptr->src_nodes <= 0)
 1133                 pf_rm_rule(NULL, cur->rule.ptr);
 1134         if (cur->nat_rule.ptr != NULL)
 1135                 if (--cur->nat_rule.ptr->states_cur <= 0 &&
 1136                         cur->nat_rule.ptr->src_nodes <= 0)
 1137                         pf_rm_rule(NULL, cur->nat_rule.ptr);
 1138         if (cur->anchor.ptr != NULL)
 1139                 if (--cur->anchor.ptr->states_cur <= 0)
 1140                         pf_rm_rule(NULL, cur->anchor.ptr);
 1141         pf_normalize_tcp_cleanup(cur);
 1142         pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
 1143 
 1144         /*
 1145          * We may be freeing pf_purge_expired_states()'s saved scan entry,
 1146          * adjust it if necessary.
 1147          */
 1148         if (purge_cur == cur) {
 1149                 kprintf("PURGE CONFLICT\n");
 1150                 purge_cur = TAILQ_NEXT(purge_cur, entry_list);
 1151         }
 1152         TAILQ_REMOVE(&state_list, cur, entry_list);
 1153         if (cur->tag)
 1154                 pf_tag_unref(cur->tag);
 1155         kfree(cur, M_PFSTATEPL);
 1156         pf_status.fcounters[FCNT_STATE_REMOVALS]++;
 1157         pf_status.states--;
 1158 }
 1159 
 1160 int
 1161 pf_purge_expired_states(u_int32_t maxcheck, int waslocked)
 1162 {
 1163         struct pf_state         *cur;
 1164         int                      locked = waslocked;
 1165 
 1166         while (maxcheck--) {
 1167                 /*
 1168                  * Wrap to start of list when we hit the end
 1169                  */
 1170                 cur = purge_cur;
 1171                 if (cur == NULL) {
 1172                         cur = TAILQ_FIRST(&state_list);
 1173                         if (cur == NULL)
 1174                                 break;  /* list empty */
 1175                 }
 1176 
 1177                 /*
 1178                  * Setup next (purge_cur) while we process this one.  If we block and
 1179                  * something else deletes purge_cur, pf_free_state() will adjust it further
 1180                  * ahead.
 1181                  */
 1182                 purge_cur = TAILQ_NEXT(cur, entry_list);
 1183 
 1184                 if (cur->timeout == PFTM_UNLINKED) {
 1185                         /* free unlinked state */
 1186                         if (! locked) {
 1187                                 lockmgr(&pf_consistency_lock, LK_EXCLUSIVE);
 1188                                 locked = 1;
 1189                         }
 1190                         pf_free_state(cur);
 1191                 } else if (pf_state_expires(cur) <= time_second) {
 1192                         /* unlink and free expired state */
 1193                         pf_unlink_state(cur);
 1194                         if (! locked) {
 1195                                 if (!lockmgr(&pf_consistency_lock, LK_EXCLUSIVE))
 1196                                         return (0);
 1197                                 locked = 1;
 1198                         }
 1199                         pf_free_state(cur);
 1200                 }
 1201         }
 1202 
 1203         if (locked)
 1204                 lockmgr(&pf_consistency_lock, LK_RELEASE);
 1205         return (1);
 1206 }
 1207 
 1208 int
 1209 pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
 1210 {
 1211         if (aw->type != PF_ADDR_TABLE)
 1212                 return (0);
 1213         if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
 1214                 return (1);
 1215         return (0);
 1216 }
 1217 
 1218 void
 1219 pf_tbladdr_remove(struct pf_addr_wrap *aw)
 1220 {
 1221         if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
 1222                 return;
 1223         pfr_detach_table(aw->p.tbl);
 1224         aw->p.tbl = NULL;
 1225 }
 1226 
 1227 void
 1228 pf_tbladdr_copyout(struct pf_addr_wrap *aw)
 1229 {
 1230         struct pfr_ktable *kt = aw->p.tbl;
 1231 
 1232         if (aw->type != PF_ADDR_TABLE || kt == NULL)
 1233                 return;
 1234         if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
 1235                 kt = kt->pfrkt_root;
 1236         aw->p.tbl = NULL;
 1237         aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
 1238                 kt->pfrkt_cnt : -1;
 1239 }
 1240 
 1241 void
 1242 pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
 1243 {
 1244         switch (af) {
 1245 #ifdef INET
 1246         case AF_INET: {
 1247                 u_int32_t a = ntohl(addr->addr32[0]);
 1248                 kprintf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
 1249                     (a>>8)&255, a&255);
 1250                 if (p) {
 1251                         p = ntohs(p);
 1252                         kprintf(":%u", p);
 1253                 }
 1254                 break;
 1255         }
 1256 #endif /* INET */
 1257 #ifdef INET6
 1258         case AF_INET6: {
 1259                 u_int16_t b;
 1260                 u_int8_t i, curstart = 255, curend = 0,
 1261                     maxstart = 0, maxend = 0;
 1262                 for (i = 0; i < 8; i++) {
 1263                         if (!addr->addr16[i]) {
 1264                                 if (curstart == 255)
 1265                                         curstart = i;
 1266                                 else
 1267                                         curend = i;
 1268                         } else {
 1269                                 if (curstart) {
 1270                                         if ((curend - curstart) >
 1271                                             (maxend - maxstart)) {
 1272                                                 maxstart = curstart;
 1273                                                 maxend = curend;
 1274                                                 curstart = 255;
 1275                                         }
 1276                                 }
 1277                         }
 1278                 }
 1279                 for (i = 0; i < 8; i++) {
 1280                         if (i >= maxstart && i <= maxend) {
 1281                                 if (maxend != 7) {
 1282                                         if (i == maxstart)
 1283                                                 kprintf(":");
 1284                                 } else {
 1285                                         if (i == maxend)
 1286                                                 kprintf(":");
 1287                                 }
 1288                         } else {
 1289                                 b = ntohs(addr->addr16[i]);
 1290                                 kprintf("%x", b);
 1291                                 if (i < 7)
 1292                                         kprintf(":");
 1293                         }
 1294                 }
 1295                 if (p) {
 1296                         p = ntohs(p);
 1297                         kprintf("[%u]", p);
 1298                 }
 1299                 break;
 1300         }
 1301 #endif /* INET6 */
 1302         }
 1303 }
 1304 
 1305 void
 1306 pf_print_state(struct pf_state *s)
 1307 {
 1308         pf_print_state_parts(s, NULL, NULL);
 1309 }
 1310 
 1311 void
 1312 pf_print_state_parts(struct pf_state *s,
 1313     struct pf_state_key *skwp, struct pf_state_key *sksp)
 1314 {
 1315         struct pf_state_key *skw, *sks;
 1316         u_int8_t proto, dir;
 1317 
 1318         /* Do our best to fill these, but they're skipped if NULL */
 1319         skw = skwp ? skwp : (s ? s->key[PF_SK_WIRE] : NULL);
 1320         sks = sksp ? sksp : (s ? s->key[PF_SK_STACK] : NULL);
 1321         proto = skw ? skw->proto : (sks ? sks->proto : 0);
 1322         dir = s ? s->direction : 0;
 1323 
 1324         switch (proto) {
 1325         case IPPROTO_TCP:
 1326                 kprintf("TCP ");
 1327                 break;
 1328         case IPPROTO_UDP:
 1329                 kprintf("UDP ");
 1330                 break;
 1331         case IPPROTO_ICMP:
 1332                 kprintf("ICMP ");
 1333                 break;
 1334         case IPPROTO_ICMPV6:
 1335                 kprintf("ICMPV6 ");
 1336                 break;
 1337         default:
 1338                 kprintf("%u ", skw->proto);
 1339                 break;
 1340         }
 1341         switch (dir) {
 1342         case PF_IN:
 1343                 kprintf(" in");
 1344                 break;
 1345         case PF_OUT:
 1346                 kprintf(" out");
 1347                 break;
 1348         }
 1349         if (skw) {
 1350                 kprintf(" wire: ");
 1351                 pf_print_host(&skw->addr[0], skw->port[0], skw->af);
 1352                 kprintf(" ");
 1353                 pf_print_host(&skw->addr[1], skw->port[1], skw->af);
 1354         }
 1355         if (sks) {
 1356                 kprintf(" stack: ");
 1357                 if (sks != skw) {
 1358                         pf_print_host(&sks->addr[0], sks->port[0], sks->af);
 1359                         kprintf(" ");
 1360                         pf_print_host(&sks->addr[1], sks->port[1], sks->af);
 1361                 } else
 1362                         kprintf("-");
 1363         }
 1364         if (s) {
 1365                 if (proto == IPPROTO_TCP) {
 1366                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
 1367                             s->src.seqlo, s->src.seqhi,
 1368                             s->src.max_win, s->src.seqdiff);
 1369                         if (s->src.wscale && s->dst.wscale)
 1370                                 kprintf(" wscale=%u",
 1371                                     s->src.wscale & PF_WSCALE_MASK);
 1372                         kprintf("]");
 1373                         kprintf(" [lo=%u high=%u win=%u modulator=%u",
 1374                             s->dst.seqlo, s->dst.seqhi,
 1375                             s->dst.max_win, s->dst.seqdiff);
 1376                         if (s->src.wscale && s->dst.wscale)
 1377                                 kprintf(" wscale=%u",
 1378                                 s->dst.wscale & PF_WSCALE_MASK);
 1379                         kprintf("]");
 1380                 }
 1381                 kprintf(" %u:%u", s->src.state, s->dst.state);
 1382         }
 1383 }
 1384 
 1385 void
 1386 pf_print_flags(u_int8_t f)
 1387 {
 1388         if (f)
 1389                 kprintf(" ");
 1390         if (f & TH_FIN)
 1391                 kprintf("F");
 1392         if (f & TH_SYN)
 1393                 kprintf("S");
 1394         if (f & TH_RST)
 1395                 kprintf("R");
 1396         if (f & TH_PUSH)
 1397                 kprintf("P");
 1398         if (f & TH_ACK)
 1399                 kprintf("A");
 1400         if (f & TH_URG)
 1401                 kprintf("U");
 1402         if (f & TH_ECE)
 1403                 kprintf("E");
 1404         if (f & TH_CWR)
 1405                 kprintf("W");
 1406 }
 1407 
 1408 #define PF_SET_SKIP_STEPS(i)                                    \
 1409         do {                                                    \
 1410                 while (head[i] != cur) {                        \
 1411                         head[i]->skip[i].ptr = cur;             \
 1412                         head[i] = TAILQ_NEXT(head[i], entries); \
 1413                 }                                               \
 1414         } while (0)
 1415 
 1416 void
 1417 pf_calc_skip_steps(struct pf_rulequeue *rules)
 1418 {
 1419         struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
 1420         int i;
 1421 
 1422         cur = TAILQ_FIRST(rules);
 1423         prev = cur;
 1424         for (i = 0; i < PF_SKIP_COUNT; ++i)
 1425                 head[i] = cur;
 1426         while (cur != NULL) {
 1427 
 1428                 if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
 1429                         PF_SET_SKIP_STEPS(PF_SKIP_IFP);
 1430                 if (cur->direction != prev->direction)
 1431                         PF_SET_SKIP_STEPS(PF_SKIP_DIR);
 1432                 if (cur->af != prev->af)
 1433                         PF_SET_SKIP_STEPS(PF_SKIP_AF);
 1434                 if (cur->proto != prev->proto)
 1435                         PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
 1436                 if (cur->src.neg != prev->src.neg ||
 1437                     pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
 1438                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
 1439                 if (cur->src.port[0] != prev->src.port[0] ||
 1440                     cur->src.port[1] != prev->src.port[1] ||
 1441                     cur->src.port_op != prev->src.port_op)
 1442                         PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
 1443                 if (cur->dst.neg != prev->dst.neg ||
 1444                     pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
 1445                         PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
 1446                 if (cur->dst.port[0] != prev->dst.port[0] ||
 1447                     cur->dst.port[1] != prev->dst.port[1] ||
 1448                     cur->dst.port_op != prev->dst.port_op)
 1449                         PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
 1450 
 1451                 prev = cur;
 1452                 cur = TAILQ_NEXT(cur, entries);
 1453         }
 1454         for (i = 0; i < PF_SKIP_COUNT; ++i)
 1455                 PF_SET_SKIP_STEPS(i);
 1456 }
 1457 
 1458 int
 1459 pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
 1460 {
 1461         if (aw1->type != aw2->type)
 1462                 return (1);
 1463         switch (aw1->type) {
 1464         case PF_ADDR_ADDRMASK:
 1465         case PF_ADDR_RANGE:
 1466                 if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
 1467                         return (1);
 1468                 if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
 1469                         return (1);
 1470                 return (0);
 1471         case PF_ADDR_DYNIFTL:
 1472                 return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
 1473         case PF_ADDR_NOROUTE:
 1474         case PF_ADDR_URPFFAILED:
 1475                 return (0);
 1476         case PF_ADDR_TABLE:
 1477                 return (aw1->p.tbl != aw2->p.tbl);
 1478         case PF_ADDR_RTLABEL:
 1479                 return (aw1->v.rtlabel != aw2->v.rtlabel);
 1480         default:
 1481                 kprintf("invalid address type: %d\n", aw1->type);
 1482                 return (1);
 1483         }
 1484 }
 1485 
 1486 u_int16_t
 1487 pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
 1488 {
 1489         u_int32_t       l;
 1490 
 1491         if (udp && !cksum)
 1492                 return (0x0000);
 1493         l = cksum + old - new;
 1494         l = (l >> 16) + (l & 65535);
 1495         l = l & 65535;
 1496         if (udp && !l)
 1497                 return (0xFFFF);
 1498         return (l);
 1499 }
 1500 
 1501 void
 1502 pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
 1503     struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
 1504 {
 1505         struct pf_addr  ao;
 1506         u_int16_t       po = *p;
 1507 
 1508         PF_ACPY(&ao, a, af);
 1509         PF_ACPY(a, an, af);
 1510 
 1511         *p = pn;
 1512 
 1513         switch (af) {
 1514 #ifdef INET
 1515         case AF_INET:
 1516                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
 1517                     ao.addr16[0], an->addr16[0], 0),
 1518                     ao.addr16[1], an->addr16[1], 0);
 1519                 *p = pn;
 1520                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
 1521                     ao.addr16[0], an->addr16[0], u),
 1522                     ao.addr16[1], an->addr16[1], u),
 1523                     po, pn, u);
 1524                 break;
 1525 #endif /* INET */
 1526 #ifdef INET6
 1527         case AF_INET6:
 1528                 *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1529                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1530                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
 1531                     ao.addr16[0], an->addr16[0], u),
 1532                     ao.addr16[1], an->addr16[1], u),
 1533                     ao.addr16[2], an->addr16[2], u),
 1534                     ao.addr16[3], an->addr16[3], u),
 1535                     ao.addr16[4], an->addr16[4], u),
 1536                     ao.addr16[5], an->addr16[5], u),
 1537                     ao.addr16[6], an->addr16[6], u),
 1538                     ao.addr16[7], an->addr16[7], u),
 1539                     po, pn, u);
 1540                 break;
 1541 #endif /* INET6 */
 1542         }
 1543 }
 1544 
 1545 
 1546 /* Changes a u_int32_t.  Uses a void * so there are no align restrictions */
 1547 void
 1548 pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
 1549 {
 1550         u_int32_t       ao;
 1551 
 1552         memcpy(&ao, a, sizeof(ao));
 1553         memcpy(a, &an, sizeof(u_int32_t));
 1554         *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
 1555             ao % 65536, an % 65536, u);
 1556 }
 1557 
 1558 #ifdef INET6
 1559 void
 1560 pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
 1561 {
 1562         struct pf_addr  ao;
 1563 
 1564         PF_ACPY(&ao, a, AF_INET6);
 1565         PF_ACPY(a, an, AF_INET6);
 1566 
 1567         *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1568             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1569             pf_cksum_fixup(pf_cksum_fixup(*c,
 1570             ao.addr16[0], an->addr16[0], u),
 1571             ao.addr16[1], an->addr16[1], u),
 1572             ao.addr16[2], an->addr16[2], u),
 1573             ao.addr16[3], an->addr16[3], u),
 1574             ao.addr16[4], an->addr16[4], u),
 1575             ao.addr16[5], an->addr16[5], u),
 1576             ao.addr16[6], an->addr16[6], u),
 1577             ao.addr16[7], an->addr16[7], u);
 1578 }
 1579 #endif /* INET6 */
 1580 
 1581 void
 1582 pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
 1583     struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
 1584     u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
 1585 {
 1586         struct pf_addr  oia, ooa;
 1587 
 1588         PF_ACPY(&oia, ia, af);
 1589         if (oa)
 1590                 PF_ACPY(&ooa, oa, af);
 1591 
 1592         /* Change inner protocol port, fix inner protocol checksum. */
 1593         if (ip != NULL) {
 1594                 u_int16_t       oip = *ip;
 1595                 u_int32_t       opc = 0;
 1596 
 1597                 if (pc != NULL)
 1598                         opc = *pc;
 1599                 *ip = np;
 1600                 if (pc != NULL)
 1601                         *pc = pf_cksum_fixup(*pc, oip, *ip, u);
 1602                 *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
 1603                 if (pc != NULL)
 1604                         *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
 1605         }
 1606         /* Change inner ip address, fix inner ip and icmp checksums. */
 1607         PF_ACPY(ia, na, af);
 1608         switch (af) {
 1609 #ifdef INET
 1610         case AF_INET: {
 1611                 u_int32_t        oh2c = *h2c;
 1612 
 1613                 *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
 1614                     oia.addr16[0], ia->addr16[0], 0),
 1615                     oia.addr16[1], ia->addr16[1], 0);
 1616                 *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
 1617                     oia.addr16[0], ia->addr16[0], 0),
 1618                     oia.addr16[1], ia->addr16[1], 0);
 1619                 *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
 1620                 break;
 1621         }
 1622 #endif /* INET */
 1623 #ifdef INET6
 1624         case AF_INET6:
 1625                 *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1626                     pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1627                     pf_cksum_fixup(pf_cksum_fixup(*ic,
 1628                     oia.addr16[0], ia->addr16[0], u),
 1629                     oia.addr16[1], ia->addr16[1], u),
 1630                     oia.addr16[2], ia->addr16[2], u),
 1631                     oia.addr16[3], ia->addr16[3], u),
 1632                     oia.addr16[4], ia->addr16[4], u),
 1633                     oia.addr16[5], ia->addr16[5], u),
 1634                     oia.addr16[6], ia->addr16[6], u),
 1635                     oia.addr16[7], ia->addr16[7], u);
 1636                 break;
 1637 #endif /* INET6 */
 1638         }
 1639         /* Outer ip address, fix outer ip or icmpv6 checksum, if necessary. */
 1640         if (oa) {
 1641                 PF_ACPY(oa, na, af);
 1642                 switch (af) {
 1643 #ifdef INET
 1644                 case AF_INET:
 1645                         *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
 1646                             ooa.addr16[0], oa->addr16[0], 0),
 1647                             ooa.addr16[1], oa->addr16[1], 0);
 1648                         break;
 1649 #endif /* INET */
 1650 #ifdef INET6
 1651                 case AF_INET6:
 1652                         *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1653                             pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
 1654                             pf_cksum_fixup(pf_cksum_fixup(*ic,
 1655                             ooa.addr16[0], oa->addr16[0], u),
 1656                             ooa.addr16[1], oa->addr16[1], u),
 1657                             ooa.addr16[2], oa->addr16[2], u),
 1658                             ooa.addr16[3], oa->addr16[3], u),
 1659                             ooa.addr16[4], oa->addr16[4], u),
 1660                             ooa.addr16[5], oa->addr16[5], u),
 1661                             ooa.addr16[6], oa->addr16[6], u),
 1662                             ooa.addr16[7], oa->addr16[7], u);
 1663                         break;
 1664 #endif /* INET6 */
 1665                 }
 1666         }
 1667 }
 1668 
 1669 
 1670 /*
 1671  * Need to modulate the sequence numbers in the TCP SACK option
 1672  * (credits to Krzysztof Pfaff for report and patch)
 1673  */
 1674 int
 1675 pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
 1676     struct tcphdr *th, struct pf_state_peer *dst)
 1677 {
 1678         int hlen = (th->th_off << 2) - sizeof(*th), thoptlen = hlen;
 1679         u_int8_t opts[TCP_MAXOLEN], *opt = opts;
 1680         int copyback = 0, i, olen;
 1681         struct raw_sackblock sack;
 1682 
 1683 #define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
 1684         if (hlen < TCPOLEN_SACKLEN ||
 1685             !pf_pull_hdr(m, off + sizeof(*th), opts, hlen, NULL, NULL, pd->af))
 1686                 return 0;
 1687 
 1688         while (hlen >= TCPOLEN_SACKLEN) {
 1689                 olen = opt[1];
 1690                 switch (*opt) {
 1691                 case TCPOPT_EOL:        /* FALLTHROUGH */
 1692                 case TCPOPT_NOP:
 1693                         opt++;
 1694                         hlen--;
 1695                         break;
 1696                 case TCPOPT_SACK:
 1697                         if (olen > hlen)
 1698                                 olen = hlen;
 1699                         if (olen >= TCPOLEN_SACKLEN) {
 1700                                 for (i = 2; i + TCPOLEN_SACK <= olen;
 1701                                     i += TCPOLEN_SACK) {
 1702                                         memcpy(&sack, &opt[i], sizeof(sack));
 1703                                         pf_change_a(&sack.rblk_start, &th->th_sum,
 1704                                             htonl(ntohl(sack.rblk_start) -
 1705                                             dst->seqdiff), 0);
 1706                                         pf_change_a(&sack.rblk_end, &th->th_sum,
 1707                                             htonl(ntohl(sack.rblk_end) -
 1708                                             dst->seqdiff), 0);
 1709                                         memcpy(&opt[i], &sack, sizeof(sack));
 1710                                 }
 1711                                 copyback = 1;
 1712                         }
 1713                         /* FALLTHROUGH */
 1714                 default:
 1715                         if (olen < 2)
 1716                                 olen = 2;
 1717                         hlen -= olen;
 1718                         opt += olen;
 1719                 }
 1720         }
 1721 
 1722         if (copyback)
 1723                 m_copyback(m, off + sizeof(*th), thoptlen, opts);
 1724         return (copyback);
 1725 }
 1726 
 1727 void
 1728 pf_send_tcp(const struct pf_rule *r, sa_family_t af,
 1729     const struct pf_addr *saddr, const struct pf_addr *daddr,
 1730     u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
 1731     u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
 1732     u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
 1733 {
 1734         struct mbuf     *m;
 1735         int              len = 0, tlen;
 1736 #ifdef INET
 1737         struct ip       *h = NULL;
 1738 #endif /* INET */
 1739 #ifdef INET6
 1740         struct ip6_hdr  *h6 = NULL;
 1741 #endif /* INET6 */
 1742         struct tcphdr   *th = NULL;
 1743         char            *opt;
 1744 
 1745         ASSERT_LWKT_TOKEN_HELD(&pf_token);
 1746 
 1747         /* maximum segment size tcp option */
 1748         tlen = sizeof(struct tcphdr);
 1749         if (mss)
 1750                 tlen += 4;
 1751 
 1752         switch (af) {
 1753 #ifdef INET
 1754         case AF_INET:
 1755                 len = sizeof(struct ip) + tlen;
 1756                 break;
 1757 #endif /* INET */
 1758 #ifdef INET6
 1759         case AF_INET6:
 1760                 len = sizeof(struct ip6_hdr) + tlen;
 1761                 break;
 1762 #endif /* INET6 */
 1763         }
 1764 
 1765         /*
 1766          * Create outgoing mbuf.
 1767          *
 1768          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
 1769          * so make sure pf.flags is clear.
 1770          */
 1771         m = m_gethdr(MB_DONTWAIT, MT_HEADER);
 1772         if (m == NULL) {
 1773                 return;
 1774         }
 1775         if (tag)
 1776                 m->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
 1777         m->m_pkthdr.pf.flags = 0;
 1778         m->m_pkthdr.pf.tag = rtag;
 1779         /* XXX Recheck when upgrading to > 4.4 */
 1780         m->m_pkthdr.pf.statekey = NULL;
 1781         if (r != NULL && r->rtableid >= 0)
 1782                 m->m_pkthdr.pf.rtableid = r->rtableid;
 1783 
 1784 #ifdef ALTQ
 1785         if (r != NULL && r->qid) {
 1786                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
 1787                 m->m_pkthdr.pf.qid = r->qid;
 1788                 m->m_pkthdr.pf.ecn_af = af;
 1789                 m->m_pkthdr.pf.hdr = mtod(m, struct ip *);
 1790         }
 1791 #endif /* ALTQ */
 1792         m->m_data += max_linkhdr;
 1793         m->m_pkthdr.len = m->m_len = len;
 1794         m->m_pkthdr.rcvif = NULL;
 1795         bzero(m->m_data, len);
 1796         switch (af) {
 1797 #ifdef INET
 1798         case AF_INET:
 1799                 h = mtod(m, struct ip *);
 1800 
 1801                 /* IP header fields included in the TCP checksum */
 1802                 h->ip_p = IPPROTO_TCP;
 1803                 h->ip_len = tlen;
 1804                 h->ip_src.s_addr = saddr->v4.s_addr;
 1805                 h->ip_dst.s_addr = daddr->v4.s_addr;
 1806 
 1807                 th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
 1808                 break;
 1809 #endif /* INET */
 1810 #ifdef INET6
 1811         case AF_INET6:
 1812                 h6 = mtod(m, struct ip6_hdr *);
 1813 
 1814                 /* IP header fields included in the TCP checksum */
 1815                 h6->ip6_nxt = IPPROTO_TCP;
 1816                 h6->ip6_plen = htons(tlen);
 1817                 memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
 1818                 memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
 1819 
 1820                 th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
 1821                 break;
 1822 #endif /* INET6 */
 1823         }
 1824 
 1825         /* TCP header */
 1826         th->th_sport = sport;
 1827         th->th_dport = dport;
 1828         th->th_seq = htonl(seq);
 1829         th->th_ack = htonl(ack);
 1830         th->th_off = tlen >> 2;
 1831         th->th_flags = flags;
 1832         th->th_win = htons(win);
 1833 
 1834         if (mss) {
 1835                 opt = (char *)(th + 1);
 1836                 opt[0] = TCPOPT_MAXSEG;
 1837                 opt[1] = 4;
 1838                 mss = htons(mss);
 1839                 bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
 1840         }
 1841 
 1842         switch (af) {
 1843 #ifdef INET
 1844         case AF_INET:
 1845                 /* TCP checksum */
 1846                 th->th_sum = in_cksum(m, len);
 1847 
 1848                 /* Finish the IP header */
 1849                 h->ip_v = 4;
 1850                 h->ip_hl = sizeof(*h) >> 2;
 1851                 h->ip_tos = IPTOS_LOWDELAY;
 1852                 h->ip_len = len;
 1853                 h->ip_off = path_mtu_discovery ? IP_DF : 0;
 1854                 h->ip_ttl = ttl ? ttl : ip_defttl;
 1855                 h->ip_sum = 0;
 1856                 if (eh == NULL) {
 1857                         lwkt_reltoken(&pf_token);
 1858                         ip_output(m, NULL, NULL, 0, NULL, NULL);
 1859                         lwkt_gettoken(&pf_token);
 1860                 } else {
 1861                         struct route             ro;
 1862                         struct rtentry           rt;
 1863                         struct ether_header     *e = (void *)ro.ro_dst.sa_data;
 1864 
 1865                         if (ifp == NULL) {
 1866                                 m_freem(m);
 1867                                 return;
 1868                         }
 1869                         rt.rt_ifp = ifp;
 1870                         ro.ro_rt = &rt;
 1871                         ro.ro_dst.sa_len = sizeof(ro.ro_dst);
 1872                         ro.ro_dst.sa_family = pseudo_AF_HDRCMPLT;
 1873                         bcopy(eh->ether_dhost, e->ether_shost, ETHER_ADDR_LEN);
 1874                         bcopy(eh->ether_shost, e->ether_dhost, ETHER_ADDR_LEN);
 1875                         e->ether_type = eh->ether_type;
 1876                         /* XXX_IMPORT: later */
 1877                         lwkt_reltoken(&pf_token);
 1878                         ip_output(m, NULL, &ro, 0, NULL, NULL);
 1879                         lwkt_gettoken(&pf_token);
 1880                 }
 1881                 break;
 1882 #endif /* INET */
 1883 #ifdef INET6
 1884         case AF_INET6:
 1885                 /* TCP checksum */
 1886                 th->th_sum = in6_cksum(m, IPPROTO_TCP,
 1887                     sizeof(struct ip6_hdr), tlen);
 1888 
 1889                 h6->ip6_vfc |= IPV6_VERSION;
 1890                 h6->ip6_hlim = IPV6_DEFHLIM;
 1891 
 1892                 lwkt_reltoken(&pf_token);
 1893                 ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
 1894                 lwkt_gettoken(&pf_token);
 1895                 break;
 1896 #endif /* INET6 */
 1897         }
 1898 }
 1899 
 1900 void
 1901 pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
 1902     struct pf_rule *r)
 1903 {
 1904         struct mbuf     *m0;
 1905 
 1906         /*
 1907          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
 1908          * so make sure pf.flags is clear.
 1909          */
 1910         if ((m0 = m_copy(m, 0, M_COPYALL)) == NULL)
 1911                 return;
 1912 
 1913         m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
 1914         m0->m_pkthdr.pf.flags = 0;
 1915         /* XXX Re-Check when Upgrading to > 4.4 */
 1916         m0->m_pkthdr.pf.statekey = NULL;
 1917 
 1918         if (r->rtableid >= 0)
 1919                 m0->m_pkthdr.pf.rtableid = r->rtableid;
 1920 
 1921 #ifdef ALTQ
 1922         if (r->qid) {
 1923                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
 1924                 m0->m_pkthdr.pf.qid = r->qid;
 1925                 m0->m_pkthdr.pf.ecn_af = af;
 1926                 m0->m_pkthdr.pf.hdr = mtod(m0, struct ip *);
 1927         }
 1928 #endif /* ALTQ */
 1929 
 1930         switch (af) {
 1931 #ifdef INET
 1932         case AF_INET:
 1933                 icmp_error(m0, type, code, 0, 0);
 1934                 break;
 1935 #endif /* INET */
 1936 #ifdef INET6
 1937         case AF_INET6:
 1938                 icmp6_error(m0, type, code, 0);
 1939                 break;
 1940 #endif /* INET6 */
 1941         }
 1942 }
 1943 
 1944 /*
 1945  * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
 1946  * If n is 0, they match if they are equal. If n is != 0, they match if they
 1947  * are different.
 1948  */
 1949 int
 1950 pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
 1951     struct pf_addr *b, sa_family_t af)
 1952 {
 1953         int     match = 0;
 1954 
 1955         switch (af) {
 1956 #ifdef INET
 1957         case AF_INET:
 1958                 if ((a->addr32[0] & m->addr32[0]) ==
 1959                     (b->addr32[0] & m->addr32[0]))
 1960                         match++;
 1961                 break;
 1962 #endif /* INET */
 1963 #ifdef INET6
 1964         case AF_INET6:
 1965                 if (((a->addr32[0] & m->addr32[0]) ==
 1966                      (b->addr32[0] & m->addr32[0])) &&
 1967                     ((a->addr32[1] & m->addr32[1]) ==
 1968                      (b->addr32[1] & m->addr32[1])) &&
 1969                     ((a->addr32[2] & m->addr32[2]) ==
 1970                      (b->addr32[2] & m->addr32[2])) &&
 1971                     ((a->addr32[3] & m->addr32[3]) ==
 1972                      (b->addr32[3] & m->addr32[3])))
 1973                         match++;
 1974                 break;
 1975 #endif /* INET6 */
 1976         }
 1977         if (match) {
 1978                 if (n)
 1979                         return (0);
 1980                 else
 1981                         return (1);
 1982         } else {
 1983                 if (n)
 1984                         return (1);
 1985                 else
 1986                         return (0);
 1987         }
 1988 }
 1989 
 1990 /*
 1991  * Return 1 if b <= a <= e, otherwise return 0.
 1992  */
 1993 int
 1994 pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
 1995     struct pf_addr *a, sa_family_t af)
 1996 {
 1997         switch (af) {
 1998 #ifdef INET
 1999         case AF_INET:
 2000                 if ((a->addr32[0] < b->addr32[0]) ||
 2001                     (a->addr32[0] > e->addr32[0]))
 2002                         return (0);
 2003                 break;
 2004 #endif /* INET */
 2005 #ifdef INET6
 2006         case AF_INET6: {
 2007                 int     i;
 2008 
 2009                 /* check a >= b */
 2010                 for (i = 0; i < 4; ++i)
 2011                         if (a->addr32[i] > b->addr32[i])
 2012                                 break;
 2013                         else if (a->addr32[i] < b->addr32[i])
 2014                                 return (0);
 2015                 /* check a <= e */
 2016                 for (i = 0; i < 4; ++i)
 2017                         if (a->addr32[i] < e->addr32[i])
 2018                                 break;
 2019                         else if (a->addr32[i] > e->addr32[i])
 2020                                 return (0);
 2021                 break;
 2022         }
 2023 #endif /* INET6 */
 2024         }
 2025         return (1);
 2026 }
 2027 
 2028 int
 2029 pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
 2030 {
 2031         switch (op) {
 2032         case PF_OP_IRG:
 2033                 return ((p > a1) && (p < a2));
 2034         case PF_OP_XRG:
 2035                 return ((p < a1) || (p > a2));
 2036         case PF_OP_RRG:
 2037                 return ((p >= a1) && (p <= a2));
 2038         case PF_OP_EQ:
 2039                 return (p == a1);
 2040         case PF_OP_NE:
 2041                 return (p != a1);
 2042         case PF_OP_LT:
 2043                 return (p < a1);
 2044         case PF_OP_LE:
 2045                 return (p <= a1);
 2046         case PF_OP_GT:
 2047                 return (p > a1);
 2048         case PF_OP_GE:
 2049                 return (p >= a1);
 2050         }
 2051         return (0); /* never reached */
 2052 }
 2053 
 2054 int
 2055 pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
 2056 {
 2057         a1 = ntohs(a1);
 2058         a2 = ntohs(a2);
 2059         p = ntohs(p);
 2060         return (pf_match(op, a1, a2, p));
 2061 }
 2062 
 2063 int
 2064 pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
 2065 {
 2066         if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
 2067                 return (0);
 2068         return (pf_match(op, a1, a2, u));
 2069 }
 2070 
 2071 int
 2072 pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
 2073 {
 2074         if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
 2075                 return (0);
 2076         return (pf_match(op, a1, a2, g));
 2077 }
 2078 
 2079 int
 2080 pf_match_tag(struct mbuf *m, struct pf_rule *r, int *tag)
 2081 {
 2082         if (*tag == -1)
 2083                 *tag = m->m_pkthdr.pf.tag;
 2084 
 2085         return ((!r->match_tag_not && r->match_tag == *tag) ||
 2086             (r->match_tag_not && r->match_tag != *tag));
 2087 }
 2088 
 2089 int
 2090 pf_tag_packet(struct mbuf *m, int tag, int rtableid)
 2091 {
 2092         if (tag <= 0 && rtableid < 0)
 2093                 return (0);
 2094 
 2095         if (tag > 0)
 2096                 m->m_pkthdr.pf.tag = tag;
 2097         if (rtableid >= 0)
 2098                 m->m_pkthdr.pf.rtableid = rtableid;
 2099 
 2100         return (0);
 2101 }
 2102 
 2103 void
 2104 pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
 2105     struct pf_rule **r, struct pf_rule **a, int *match)
 2106 {
 2107         struct pf_anchor_stackframe     *f;
 2108 
 2109         (*r)->anchor->match = 0;
 2110         if (match)
 2111                 *match = 0;
 2112         if (*depth >= NELEM(pf_anchor_stack)) {
 2113                 kprintf("pf_step_into_anchor: stack overflow\n");
 2114                 *r = TAILQ_NEXT(*r, entries);
 2115                 return;
 2116         } else if (*depth == 0 && a != NULL)
 2117                 *a = *r;
 2118         f = pf_anchor_stack + (*depth)++;
 2119         f->rs = *rs;
 2120         f->r = *r;
 2121         if ((*r)->anchor_wildcard) {
 2122                 f->parent = &(*r)->anchor->children;
 2123                 if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
 2124                     NULL) {
 2125                         *r = NULL;
 2126                         return;
 2127                 }
 2128                 *rs = &f->child->ruleset;
 2129         } else {
 2130                 f->parent = NULL;
 2131                 f->child = NULL;
 2132                 *rs = &(*r)->anchor->ruleset;
 2133         }
 2134         *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
 2135 }
 2136 
 2137 int
 2138 pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
 2139     struct pf_rule **r, struct pf_rule **a, int *match)
 2140 {
 2141         struct pf_anchor_stackframe     *f;
 2142         int quick = 0;
 2143 
 2144         do {
 2145                 if (*depth <= 0)
 2146                         break;
 2147                 f = pf_anchor_stack + *depth - 1;
 2148                 if (f->parent != NULL && f->child != NULL) {
 2149                         if (f->child->match ||
 2150                             (match != NULL && *match)) {
 2151                                 f->r->anchor->match = 1;
 2152                                 *match = 0;
 2153                         }
 2154                         f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
 2155                         if (f->child != NULL) {
 2156                                 *rs = &f->child->ruleset;
 2157                                 *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
 2158                                 if (*r == NULL)
 2159                                         continue;
 2160                                 else
 2161                                         break;
 2162                         }
 2163                 }
 2164                 (*depth)--;
 2165                 if (*depth == 0 && a != NULL)
 2166                         *a = NULL;
 2167                 *rs = f->rs;
 2168                 if (f->r->anchor->match || (match != NULL && *match))
 2169                         quick = f->r->quick;
 2170                 *r = TAILQ_NEXT(f->r, entries);
 2171         } while (*r == NULL);
 2172 
 2173         return (quick);
 2174 }
 2175 
 2176 #ifdef INET6
 2177 void
 2178 pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
 2179     struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
 2180 {
 2181         switch (af) {
 2182 #ifdef INET
 2183         case AF_INET:
 2184                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
 2185                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
 2186                 break;
 2187 #endif /* INET */
 2188         case AF_INET6:
 2189                 naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
 2190                 ((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
 2191                 naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
 2192                 ((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
 2193                 naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
 2194                 ((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
 2195                 naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
 2196                 ((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
 2197                 break;
 2198         }
 2199 }
 2200 
 2201 void
 2202 pf_addr_inc(struct pf_addr *addr, sa_family_t af)
 2203 {
 2204         switch (af) {
 2205 #ifdef INET
 2206         case AF_INET:
 2207                 addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
 2208                 break;
 2209 #endif /* INET */
 2210         case AF_INET6:
 2211                 if (addr->addr32[3] == 0xffffffff) {
 2212                         addr->addr32[3] = 0;
 2213                         if (addr->addr32[2] == 0xffffffff) {
 2214                                 addr->addr32[2] = 0;
 2215                                 if (addr->addr32[1] == 0xffffffff) {
 2216                                         addr->addr32[1] = 0;
 2217                                         addr->addr32[0] =
 2218                                             htonl(ntohl(addr->addr32[0]) + 1);
 2219                                 } else
 2220                                         addr->addr32[1] =
 2221                                             htonl(ntohl(addr->addr32[1]) + 1);
 2222                         } else
 2223                                 addr->addr32[2] =
 2224                                     htonl(ntohl(addr->addr32[2]) + 1);
 2225                 } else
 2226                         addr->addr32[3] =
 2227                             htonl(ntohl(addr->addr32[3]) + 1);
 2228                 break;
 2229         }
 2230 }
 2231 #endif /* INET6 */
 2232 
 2233 #define mix(a,b,c) \
 2234         do {                                    \
 2235                 a -= b; a -= c; a ^= (c >> 13); \
 2236                 b -= c; b -= a; b ^= (a << 8);  \
 2237                 c -= a; c -= b; c ^= (b >> 13); \
 2238                 a -= b; a -= c; a ^= (c >> 12); \
 2239                 b -= c; b -= a; b ^= (a << 16); \
 2240                 c -= a; c -= b; c ^= (b >> 5);  \
 2241                 a -= b; a -= c; a ^= (c >> 3);  \
 2242                 b -= c; b -= a; b ^= (a << 10); \
 2243                 c -= a; c -= b; c ^= (b >> 15); \
 2244         } while (0)
 2245 
 2246 /*
 2247  * hash function based on bridge_hash in if_bridge.c
 2248  */
 2249 void
 2250 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
 2251     struct pf_poolhashkey *key, sa_family_t af)
 2252 {
 2253         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
 2254 
 2255         switch (af) {
 2256 #ifdef INET
 2257         case AF_INET:
 2258                 a += inaddr->addr32[0];
 2259                 b += key->key32[1];
 2260                 mix(a, b, c);
 2261                 hash->addr32[0] = c + key->key32[2];
 2262                 break;
 2263 #endif /* INET */
 2264 #ifdef INET6
 2265         case AF_INET6:
 2266                 a += inaddr->addr32[0];
 2267                 b += inaddr->addr32[2];
 2268                 mix(a, b, c);
 2269                 hash->addr32[0] = c;
 2270                 a += inaddr->addr32[1];
 2271                 b += inaddr->addr32[3];
 2272                 c += key->key32[1];
 2273                 mix(a, b, c);
 2274                 hash->addr32[1] = c;
 2275                 a += inaddr->addr32[2];
 2276                 b += inaddr->addr32[1];
 2277                 c += key->key32[2];
 2278                 mix(a, b, c);
 2279                 hash->addr32[2] = c;
 2280                 a += inaddr->addr32[3];
 2281                 b += inaddr->addr32[0];
 2282                 c += key->key32[3];
 2283                 mix(a, b, c);
 2284                 hash->addr32[3] = c;
 2285                 break;
 2286 #endif /* INET6 */
 2287         }
 2288 }
 2289 
 2290 int
 2291 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
 2292     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
 2293 {
 2294         unsigned char            hash[16];
 2295         struct pf_pool          *rpool = &r->rpool;
 2296         struct pf_addr          *raddr = &rpool->cur->addr.v.a.addr;
 2297         struct pf_addr          *rmask = &rpool->cur->addr.v.a.mask;
 2298         struct pf_pooladdr      *acur = rpool->cur;
 2299         struct pf_src_node       k;
 2300 
 2301         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
 2302             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 2303                 k.af = af;
 2304                 PF_ACPY(&k.addr, saddr, af);
 2305                 if (r->rule_flag & PFRULE_RULESRCTRACK ||
 2306                     r->rpool.opts & PF_POOL_STICKYADDR)
 2307                         k.rule.ptr = r;
 2308                 else
 2309                         k.rule.ptr = NULL;
 2310                 pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
 2311                 *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
 2312                 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
 2313                         PF_ACPY(naddr, &(*sn)->raddr, af);
 2314                         if (pf_status.debug >= PF_DEBUG_MISC) {
 2315                                 kprintf("pf_map_addr: src tracking maps ");
 2316                                 pf_print_host(&k.addr, 0, af);
 2317                                 kprintf(" to ");
 2318                                 pf_print_host(naddr, 0, af);
 2319                                 kprintf("\n");
 2320                         }
 2321                         return (0);
 2322                 }
 2323         }
 2324 
 2325         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
 2326                 return (1);
 2327         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 2328                 switch (af) {
 2329 #ifdef INET
 2330                 case AF_INET:
 2331                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
 2332                             (rpool->opts & PF_POOL_TYPEMASK) !=
 2333                             PF_POOL_ROUNDROBIN)
 2334                                 return (1);
 2335                         raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
 2336                         rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
 2337                         break;
 2338 #endif /* INET */
 2339 #ifdef INET6
 2340                 case AF_INET6:
 2341                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
 2342                             (rpool->opts & PF_POOL_TYPEMASK) !=
 2343                             PF_POOL_ROUNDROBIN)
 2344                                 return (1);
 2345                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
 2346                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
 2347                         break;
 2348 #endif /* INET6 */
 2349                 }
 2350         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 2351                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
 2352                         return (1); /* unsupported */
 2353         } else {
 2354                 raddr = &rpool->cur->addr.v.a.addr;
 2355                 rmask = &rpool->cur->addr.v.a.mask;
 2356         }
 2357 
 2358         switch (rpool->opts & PF_POOL_TYPEMASK) {
 2359         case PF_POOL_NONE:
 2360                 PF_ACPY(naddr, raddr, af);
 2361                 break;
 2362         case PF_POOL_BITMASK:
 2363                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
 2364                 break;
 2365         case PF_POOL_RANDOM:
 2366                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
 2367                         switch (af) {
 2368 #ifdef INET
 2369                         case AF_INET:
 2370                                 rpool->counter.addr32[0] = htonl(karc4random());
 2371                                 break;
 2372 #endif /* INET */
 2373 #ifdef INET6
 2374                         case AF_INET6:
 2375                                 if (rmask->addr32[3] != 0xffffffff)
 2376                                         rpool->counter.addr32[3] =
 2377                                             htonl(karc4random());
 2378                                 else
 2379                                         break;
 2380                                 if (rmask->addr32[2] != 0xffffffff)
 2381                                         rpool->counter.addr32[2] =
 2382                                             htonl(karc4random());
 2383                                 else
 2384                                         break;
 2385                                 if (rmask->addr32[1] != 0xffffffff)
 2386                                         rpool->counter.addr32[1] =
 2387                                             htonl(karc4random());
 2388                                 else
 2389                                         break;
 2390                                 if (rmask->addr32[0] != 0xffffffff)
 2391                                         rpool->counter.addr32[0] =
 2392                                             htonl(karc4random());
 2393                                 break;
 2394 #endif /* INET6 */
 2395                         }
 2396                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 2397                         PF_ACPY(init_addr, naddr, af);
 2398 
 2399                 } else {
 2400                         PF_AINC(&rpool->counter, af);
 2401                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 2402                 }
 2403                 break;
 2404         case PF_POOL_SRCHASH:
 2405                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
 2406                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
 2407                 break;
 2408         case PF_POOL_ROUNDROBIN:
 2409                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 2410                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
 2411                             &rpool->tblidx, &rpool->counter,
 2412                             &raddr, &rmask, af))
 2413                                 goto get_addr;
 2414                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 2415                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 2416                             &rpool->tblidx, &rpool->counter,
 2417                             &raddr, &rmask, af))
 2418                                 goto get_addr;
 2419                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
 2420                         goto get_addr;
 2421 
 2422         try_next:
 2423                 if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
 2424                         rpool->cur = TAILQ_FIRST(&rpool->list);
 2425                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 2426                         rpool->tblidx = -1;
 2427                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
 2428                             &rpool->tblidx, &rpool->counter,
 2429                             &raddr, &rmask, af)) {
 2430                                 /* table contains no address of type 'af' */
 2431                                 if (rpool->cur != acur)
 2432                                         goto try_next;
 2433                                 return (1);
 2434                         }
 2435                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 2436                         rpool->tblidx = -1;
 2437                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 2438                             &rpool->tblidx, &rpool->counter,
 2439                             &raddr, &rmask, af)) {
 2440                                 /* table contains no address of type 'af' */
 2441                                 if (rpool->cur != acur)
 2442                                         goto try_next;
 2443                                 return (1);
 2444                         }
 2445                 } else {
 2446                         raddr = &rpool->cur->addr.v.a.addr;
 2447                         rmask = &rpool->cur->addr.v.a.mask;
 2448                         PF_ACPY(&rpool->counter, raddr, af);
 2449                 }
 2450 
 2451         get_addr:
 2452                 PF_ACPY(naddr, &rpool->counter, af);
 2453                 if (init_addr != NULL && PF_AZERO(init_addr, af))
 2454                         PF_ACPY(init_addr, naddr, af);
 2455                 PF_AINC(&rpool->counter, af);
 2456                 break;
 2457         }
 2458         if (*sn != NULL)
 2459                 PF_ACPY(&(*sn)->raddr, naddr, af);
 2460 
 2461         if (pf_status.debug >= PF_DEBUG_MISC &&
 2462             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 2463                 kprintf("pf_map_addr: selected address ");
 2464                 pf_print_host(naddr, 0, af);
 2465                 kprintf("\n");
 2466         }
 2467 
 2468         return (0);
 2469 }
 2470 
 2471 int
 2472 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
 2473     struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
 2474     struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
 2475     struct pf_src_node **sn)
 2476 {
 2477         struct pf_state_key_cmp key;
 2478         struct pf_addr          init_addr;
 2479         u_int16_t               cut;
 2480 
 2481         bzero(&init_addr, sizeof(init_addr));
 2482         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 2483                 return (1);
 2484 
 2485         if (proto == IPPROTO_ICMP) {
 2486                 low = 1;
 2487                 high = 65535;
 2488         }
 2489 
 2490         do {
 2491                 key.af = af;
 2492                 key.proto = proto;
 2493                 PF_ACPY(&key.addr[1], daddr, key.af);
 2494                 PF_ACPY(&key.addr[0], naddr, key.af);
 2495                 key.port[1] = dport;
 2496 
 2497                 /*
 2498                  * port search; start random, step;
 2499                  * similar 2 portloop in in_pcbbind
 2500                  */
 2501                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
 2502                     proto == IPPROTO_ICMP)) {
 2503                         key.port[0] = dport;
 2504                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
 2505                                 return (0);
 2506                 } else if (low == 0 && high == 0) {
 2507                         key.port[0] = *nport;
 2508                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
 2509                                 return (0);
 2510                 } else if (low == high) {
 2511                         key.port[0] = htons(low);
 2512                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 2513                                 *nport = htons(low);
 2514                                 return (0);
 2515                         }
 2516                 } else {
 2517                         u_int16_t tmp;
 2518 
 2519                         if (low > high) {
 2520                                 tmp = low;
 2521                                 low = high;
 2522                                 high = tmp;
 2523                         }
 2524                         /* low < high */
 2525                         cut = htonl(karc4random()) % (1 + high - low) + low;
 2526                         /* low <= cut <= high */
 2527                         for (tmp = cut; tmp <= high; ++(tmp)) {
 2528                                 key.port[0] = htons(tmp);
 2529                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 2530                                     NULL && !in_baddynamic(tmp, proto)) {
 2531                                         *nport = htons(tmp);
 2532                                         return (0);
 2533                                 }
 2534                         }
 2535                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
 2536                                 key.port[0] = htons(tmp);
 2537                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 2538                                     NULL && !in_baddynamic(tmp, proto)) {
 2539                                         *nport = htons(tmp);
 2540                                         return (0);
 2541                                 }
 2542                         }
 2543                 }
 2544 
 2545                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
 2546                 case PF_POOL_RANDOM:
 2547                 case PF_POOL_ROUNDROBIN:
 2548                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 2549                                 return (1);
 2550                         break;
 2551                 case PF_POOL_NONE:
 2552                 case PF_POOL_SRCHASH:
 2553                 case PF_POOL_BITMASK:
 2554                 default:
 2555                         return (1);
 2556                 }
 2557         } while (! PF_AEQ(&init_addr, naddr, af) );
 2558         return (1);                                     /* none available */
 2559 }
 2560 
 2561 struct pf_rule *
 2562 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
 2563     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
 2564     struct pf_addr *daddr, u_int16_t dport, int rs_num)
 2565 {
 2566         struct pf_rule          *r, *rm = NULL;
 2567         struct pf_ruleset       *ruleset = NULL;
 2568         int                      tag = -1;
 2569         int                      rtableid = -1;
 2570         int                      asd = 0;
 2571 
 2572         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
 2573         while (r && rm == NULL) {
 2574                 struct pf_rule_addr     *src = NULL, *dst = NULL;
 2575                 struct pf_addr_wrap     *xdst = NULL;
 2576 
 2577                 if (r->action == PF_BINAT && direction == PF_IN) {
 2578                         src = &r->dst;
 2579                         if (r->rpool.cur != NULL)
 2580                                 xdst = &r->rpool.cur->addr;
 2581                 } else {
 2582                         src = &r->src;
 2583                         dst = &r->dst;
 2584                 }
 2585 
 2586                 r->evaluations++;
 2587                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 2588                         r = r->skip[PF_SKIP_IFP].ptr;
 2589                 else if (r->direction && r->direction != direction)
 2590                         r = r->skip[PF_SKIP_DIR].ptr;
 2591                 else if (r->af && r->af != pd->af)
 2592                         r = r->skip[PF_SKIP_AF].ptr;
 2593                 else if (r->proto && r->proto != pd->proto)
 2594                         r = r->skip[PF_SKIP_PROTO].ptr;
 2595                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
 2596                     src->neg, kif))
 2597                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
 2598                             PF_SKIP_DST_ADDR].ptr;
 2599                 else if (src->port_op && !pf_match_port(src->port_op,
 2600                     src->port[0], src->port[1], sport))
 2601                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
 2602                             PF_SKIP_DST_PORT].ptr;
 2603                 else if (dst != NULL &&
 2604                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
 2605                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 2606                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
 2607                     0, NULL))
 2608                         r = TAILQ_NEXT(r, entries);
 2609                 else if (dst != NULL && dst->port_op &&
 2610                     !pf_match_port(dst->port_op, dst->port[0],
 2611                     dst->port[1], dport))
 2612                         r = r->skip[PF_SKIP_DST_PORT].ptr;
 2613                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
 2614                         r = TAILQ_NEXT(r, entries);
 2615                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
 2616                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
 2617                     off, pd->hdr.tcp), r->os_fingerprint)))
 2618                         r = TAILQ_NEXT(r, entries);
 2619                 else {
 2620                         if (r->tag)
 2621                                 tag = r->tag;
 2622                         if (r->rtableid >= 0)
 2623                                 rtableid = r->rtableid;
 2624                         if (r->anchor == NULL) {
 2625                                 rm = r;
 2626                         } else
 2627                                 pf_step_into_anchor(&asd, &ruleset, rs_num,
 2628                                     &r, NULL, NULL);
 2629                 }
 2630                 if (r == NULL)
 2631                         pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
 2632                             NULL, NULL);
 2633         }
 2634         if (pf_tag_packet(m, tag, rtableid))
 2635                 return (NULL);
 2636         if (rm != NULL && (rm->action == PF_NONAT ||
 2637             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
 2638                 return (NULL);
 2639         return (rm);
 2640 }
 2641 
 2642 struct pf_rule *
 2643 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
 2644     struct pfi_kif *kif, struct pf_src_node **sn,
 2645     struct pf_state_key **skw, struct pf_state_key **sks,
 2646     struct pf_state_key **skp, struct pf_state_key **nkp,
 2647     struct pf_addr *saddr, struct pf_addr *daddr,
 2648     u_int16_t sport, u_int16_t dport)
 2649 {
 2650         struct pf_rule  *r = NULL;
 2651 
 2652 
 2653         if (direction == PF_OUT) {
 2654                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 2655                     sport, daddr, dport, PF_RULESET_BINAT);
 2656                 if (r == NULL)
 2657                         r = pf_match_translation(pd, m, off, direction, kif,
 2658                             saddr, sport, daddr, dport, PF_RULESET_NAT);
 2659         } else {
 2660                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 2661                     sport, daddr, dport, PF_RULESET_RDR);
 2662                 if (r == NULL)
 2663                         r = pf_match_translation(pd, m, off, direction, kif,
 2664                             saddr, sport, daddr, dport, PF_RULESET_BINAT);
 2665         }
 2666 
 2667         if (r != NULL) {
 2668                 struct pf_addr  *naddr;
 2669                 u_int16_t       *nport;
 2670 
 2671                 if (pf_state_key_setup(pd, r, skw, sks, skp, nkp,
 2672                     saddr, daddr, sport, dport))
 2673                         return r;
 2674 
 2675                 /* XXX We only modify one side for now. */
 2676                 naddr = &(*nkp)->addr[1];
 2677                 nport = &(*nkp)->port[1];
 2678 
 2679                 /*
 2680                  * NOTE: Currently all translations will clear
 2681                  *       BRIDGE_MBUF_TAGGED, telling the bridge to
 2682                  *       ignore the original input encapsulation.
 2683                  */
 2684                 switch (r->action) {
 2685                 case PF_NONAT:
 2686                 case PF_NOBINAT:
 2687                 case PF_NORDR:
 2688                         return (NULL);
 2689                 case PF_NAT:
 2690                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
 2691                         if (pf_get_sport(pd->af, pd->proto, r, saddr,
 2692                             daddr, dport, naddr, nport, r->rpool.proxy_port[0],
 2693                             r->rpool.proxy_port[1], sn)) {
 2694                                 DPFPRINTF(PF_DEBUG_MISC,
 2695                                     ("pf: NAT proxy port allocation "
 2696                                     "(%u-%u) failed\n",
 2697                                     r->rpool.proxy_port[0],
 2698                                     r->rpool.proxy_port[1]));
 2699                                 return (NULL);
 2700                         }
 2701                         break;
 2702                 case PF_BINAT:
 2703                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
 2704                         switch (direction) {
 2705                         case PF_OUT:
 2706                                 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
 2707                                         switch (pd->af) {
 2708 #ifdef INET
 2709                                         case AF_INET:
 2710                                                 if (r->rpool.cur->addr.p.dyn->
 2711                                                     pfid_acnt4 < 1)
 2712                                                         return (NULL);
 2713                                                 PF_POOLMASK(naddr,
 2714                                                     &r->rpool.cur->addr.p.dyn->
 2715                                                     pfid_addr4,
 2716                                                     &r->rpool.cur->addr.p.dyn->
 2717                                                     pfid_mask4,
 2718                                                     saddr, AF_INET);
 2719                                                 break;
 2720 #endif /* INET */
 2721 #ifdef INET6
 2722                                         case AF_INET6:
 2723                                                 if (r->rpool.cur->addr.p.dyn->
 2724                                                     pfid_acnt6 < 1)
 2725                                                         return (NULL);
 2726                                                 PF_POOLMASK(naddr,
 2727                                                     &r->rpool.cur->addr.p.dyn->
 2728                                                     pfid_addr6,
 2729                                                     &r->rpool.cur->addr.p.dyn->
 2730                                                     pfid_mask6,
 2731                                                     saddr, AF_INET6);
 2732                                                 break;
 2733 #endif /* INET6 */
 2734                                         }
 2735                                 } else
 2736                                         PF_POOLMASK(naddr,
 2737                                             &r->rpool.cur->addr.v.a.addr,
 2738                                             &r->rpool.cur->addr.v.a.mask,
 2739                                             saddr, pd->af);
 2740                                 break;
 2741                         case PF_IN:
 2742                                 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
 2743                                         switch (pd->af) {
 2744 #ifdef INET
 2745                                         case AF_INET:
 2746                                                 if (r->src.addr.p.dyn->
 2747                                                     pfid_acnt4 < 1)
 2748                                                         return (NULL);
 2749                                                 PF_POOLMASK(naddr,
 2750                                                     &r->src.addr.p.dyn->
 2751                                                     pfid_addr4,
 2752                                                     &r->src.addr.p.dyn->
 2753                                                     pfid_mask4,
 2754                                                     daddr, AF_INET);
 2755                                                 break;
 2756 #endif /* INET */
 2757 #ifdef INET6
 2758                                         case AF_INET6:
 2759                                                 if (r->src.addr.p.dyn->
 2760                                                     pfid_acnt6 < 1)
 2761                                                         return (NULL);
 2762                                                 PF_POOLMASK(naddr,
 2763                                                     &r->src.addr.p.dyn->
 2764                                                     pfid_addr6,
 2765                                                     &r->src.addr.p.dyn->
 2766                                                     pfid_mask6,
 2767                                                     daddr, AF_INET6);
 2768                                                 break;
 2769 #endif /* INET6 */
 2770                                         }
 2771                                 } else
 2772                                         PF_POOLMASK(naddr,
 2773                                             &r->src.addr.v.a.addr,
 2774                                             &r->src.addr.v.a.mask, daddr,
 2775                                             pd->af);
 2776                                 break;
 2777                         }
 2778                         break;
 2779                 case PF_RDR: {
 2780                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
 2781                         if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
 2782                                 return (NULL);
 2783                         if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
 2784                             PF_POOL_BITMASK)
 2785                                 PF_POOLMASK(naddr, naddr,
 2786                                     &r->rpool.cur->addr.v.a.mask, daddr,
 2787                                     pd->af);
 2788 
 2789                         if (r->rpool.proxy_port[1]) {
 2790                                 u_int32_t       tmp_nport;
 2791 
 2792                                 tmp_nport = ((ntohs(dport) -
 2793                                     ntohs(r->dst.port[0])) %
 2794                                     (r->rpool.proxy_port[1] -
 2795                                     r->rpool.proxy_port[0] + 1)) +
 2796                                     r->rpool.proxy_port[0];
 2797 
 2798                                 /* wrap around if necessary */
 2799                                 if (tmp_nport > 65535)
 2800                                         tmp_nport -= 65535;
 2801                                 *nport = htons((u_int16_t)tmp_nport);
 2802                         } else if (r->rpool.proxy_port[0])
 2803                                 *nport = htons(r->rpool.proxy_port[0]);
 2804                         break;
 2805                 }
 2806                 default:
 2807                         return (NULL);
 2808                 }
 2809         }
 2810 
 2811         return (r);
 2812 }
 2813 
 2814 struct netmsg_hashlookup {
 2815         struct netmsg_base      base;
 2816         struct inpcb            **nm_pinp;
 2817         struct inpcbinfo        *nm_pcbinfo;
 2818         struct pf_addr          *nm_saddr;
 2819         struct pf_addr          *nm_daddr;
 2820         uint16_t                nm_sport;
 2821         uint16_t                nm_dport;
 2822         sa_family_t             nm_af;
 2823 };
 2824 
 2825 #ifdef PF_SOCKET_LOOKUP_DOMSG
 2826 static void
 2827 in_pcblookup_hash_handler(netmsg_t msg)
 2828 {
 2829         struct netmsg_hashlookup *rmsg = (struct netmsg_hashlookup *)msg;
 2830 
 2831         if (rmsg->nm_af == AF_INET)
 2832                 *rmsg->nm_pinp = in_pcblookup_hash(rmsg->nm_pcbinfo,
 2833                     rmsg->nm_saddr->v4, rmsg->nm_sport, rmsg->nm_daddr->v4,
 2834                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
 2835 #ifdef INET6
 2836         else
 2837                 *rmsg->nm_pinp = in6_pcblookup_hash(rmsg->nm_pcbinfo,
 2838                     &rmsg->nm_saddr->v6, rmsg->nm_sport, &rmsg->nm_daddr->v6,
 2839                     rmsg->nm_dport, INPLOOKUP_WILDCARD, NULL);
 2840 #endif /* INET6 */
 2841         lwkt_replymsg(&rmsg->base.lmsg, 0);
 2842 }
 2843 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
 2844 
 2845 int
 2846 pf_socket_lookup(int direction, struct pf_pdesc *pd)
 2847 {
 2848         struct pf_addr          *saddr, *daddr;
 2849         u_int16_t                sport, dport;
 2850         struct inpcbinfo        *pi;
 2851         struct inpcb            *inp;
 2852         struct netmsg_hashlookup *msg = NULL;
 2853 #ifdef PF_SOCKET_LOOKUP_DOMSG
 2854         struct netmsg_hashlookup msg0;
 2855 #endif
 2856         int                      pi_cpu = 0;
 2857 
 2858         if (pd == NULL)
 2859                 return (-1);
 2860         pd->lookup.uid = UID_MAX;
 2861         pd->lookup.gid = GID_MAX;
 2862         pd->lookup.pid = NO_PID;
 2863         if (direction == PF_IN) {
 2864                 saddr = pd->src;
 2865                 daddr = pd->dst;
 2866         } else {
 2867                 saddr = pd->dst;
 2868                 daddr = pd->src;
 2869         }
 2870         switch (pd->proto) {
 2871         case IPPROTO_TCP:
 2872                 if (pd->hdr.tcp == NULL)
 2873                         return (-1);
 2874                 sport = pd->hdr.tcp->th_sport;
 2875                 dport = pd->hdr.tcp->th_dport;
 2876 
 2877                 pi_cpu = tcp_addrcpu(saddr->v4.s_addr, sport, daddr->v4.s_addr, dport);
 2878                 pi = &tcbinfo[pi_cpu];
 2879                 /*
 2880                  * Our netstack runs lockless on MP systems
 2881                  * (only for TCP connections at the moment).
 2882                  * 
 2883                  * As we are not allowed to read another CPU's tcbinfo,
 2884                  * we have to ask that CPU via remote call to search the
 2885                  * table for us.
 2886                  * 
 2887                  * Prepare a msg iff data belongs to another CPU.
 2888                  */
 2889                 if (pi_cpu != mycpu->gd_cpuid) {
 2890 #ifdef PF_SOCKET_LOOKUP_DOMSG
 2891                         /*
 2892                          * NOTE:
 2893                          *
 2894                          * Following lwkt_domsg() is dangerous and could
 2895                          * lockup the network system, e.g.
 2896                          *
 2897                          * On 2 CPU system:
 2898                          * netisr0 domsg to netisr1 (due to lookup)
 2899                          * netisr1 domsg to netisr0 (due to lookup)
 2900                          *
 2901                          * We simply return -1 here, since we are probably
 2902                          * called before NAT, so the TCP packet should
 2903                          * already be on the correct CPU.
 2904                          */
 2905                         msg = &msg0;
 2906                         netmsg_init(&msg->base, NULL, &curthread->td_msgport,
 2907                                     0, in_pcblookup_hash_handler);
 2908                         msg->nm_pinp = &inp;
 2909                         msg->nm_pcbinfo = pi;
 2910                         msg->nm_saddr = saddr;
 2911                         msg->nm_sport = sport;
 2912                         msg->nm_daddr = daddr;
 2913                         msg->nm_dport = dport;
 2914                         msg->nm_af = pd->af;
 2915 #else   /* !PF_SOCKET_LOOKUP_DOMSG */
 2916                         kprintf("pf_socket_lookup: tcp packet not on the "
 2917                                 "correct cpu %d, cur cpu %d\n",
 2918                                 pi_cpu, mycpuid);
 2919                         print_backtrace(-1);
 2920                         return -1;
 2921 #endif  /* PF_SOCKET_LOOKUP_DOMSG */
 2922                 }
 2923                 break;
 2924         case IPPROTO_UDP:
 2925                 if (pd->hdr.udp == NULL)
 2926                         return (-1);
 2927                 sport = pd->hdr.udp->uh_sport;
 2928                 dport = pd->hdr.udp->uh_dport;
 2929                 pi = &udbinfo;
 2930                 break;
 2931         default:
 2932                 return (-1);
 2933         }
 2934         if (direction != PF_IN) {
 2935                 u_int16_t       p;
 2936 
 2937                 p = sport;
 2938                 sport = dport;
 2939                 dport = p;
 2940         }
 2941         switch (pd->af) {
 2942 #ifdef INET6
 2943         case AF_INET6:
 2944                 /*
 2945                  * Query other CPU, second part
 2946                  * 
 2947                  * msg only gets initialized when:
 2948                  * 1) packet is TCP
 2949                  * 2) the info belongs to another CPU
 2950                  *
 2951                  * Use some switch/case magic to avoid code duplication.
 2952                  */
 2953                 if (msg == NULL) {
 2954                         inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
 2955                             &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
 2956 
 2957                         if (inp == NULL)
 2958                                 return (-1);
 2959                         break;
 2960                 }
 2961                 /* FALLTHROUGH if SMP and on other CPU */
 2962 #endif /* INET6 */
 2963         case AF_INET:
 2964                 if (msg != NULL) {
 2965                         lwkt_domsg(netisr_cpuport(pi_cpu),
 2966                                      &msg->base.lmsg, 0);
 2967                 } else
 2968                 {
 2969                         inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
 2970                             dport, INPLOOKUP_WILDCARD, NULL);
 2971                 }
 2972                 if (inp == NULL)
 2973                         return (-1);
 2974                 break;
 2975 
 2976         default:
 2977                 return (-1);
 2978         }
 2979         pd->lookup.uid = inp->inp_socket->so_cred->cr_uid;
 2980         pd->lookup.gid = inp->inp_socket->so_cred->cr_groups[0];
 2981         return (1);
 2982 }
 2983 
 2984 u_int8_t
 2985 pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
 2986 {
 2987         int              hlen;
 2988         u_int8_t         hdr[60];
 2989         u_int8_t        *opt, optlen;
 2990         u_int8_t         wscale = 0;
 2991 
 2992         hlen = th_off << 2;             /* hlen <= sizeof(hdr) */
 2993         if (hlen <= sizeof(struct tcphdr))
 2994                 return (0);
 2995         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
 2996                 return (0);
 2997         opt = hdr + sizeof(struct tcphdr);
 2998         hlen -= sizeof(struct tcphdr);
 2999         while (hlen >= 3) {
 3000                 switch (*opt) {
 3001                 case TCPOPT_EOL:
 3002                 case TCPOPT_NOP:
 3003                         ++opt;
 3004                         --hlen;
 3005                         break;
 3006                 case TCPOPT_WINDOW:
 3007                         wscale = opt[2];
 3008                         if (wscale > TCP_MAX_WINSHIFT)
 3009                                 wscale = TCP_MAX_WINSHIFT;
 3010                         wscale |= PF_WSCALE_FLAG;
 3011                         /* FALLTHROUGH */
 3012                 default:
 3013                         optlen = opt[1];
 3014                         if (optlen < 2)
 3015                                 optlen = 2;
 3016                         hlen -= optlen;
 3017                         opt += optlen;
 3018                         break;
 3019                 }
 3020         }
 3021         return (wscale);
 3022 }
 3023 
 3024 u_int16_t
 3025 pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
 3026 {
 3027         int              hlen;
 3028         u_int8_t         hdr[60];
 3029         u_int8_t        *opt, optlen;
 3030         u_int16_t        mss = tcp_mssdflt;
 3031 
 3032         hlen = th_off << 2;     /* hlen <= sizeof(hdr) */
 3033         if (hlen <= sizeof(struct tcphdr))
 3034                 return (0);
 3035         if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
 3036                 return (0);
 3037         opt = hdr + sizeof(struct tcphdr);
 3038         hlen -= sizeof(struct tcphdr);
 3039         while (hlen >= TCPOLEN_MAXSEG) {
 3040                 switch (*opt) {
 3041                 case TCPOPT_EOL:
 3042                 case TCPOPT_NOP:
 3043                         ++opt;
 3044                         --hlen;
 3045                         break;
 3046                 case TCPOPT_MAXSEG:
 3047                         bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
 3048                         /* FALLTHROUGH */
 3049                 default:
 3050                         optlen = opt[1];
 3051                         if (optlen < 2)
 3052                                 optlen = 2;
 3053                         hlen -= optlen;
 3054                         opt += optlen;
 3055                         break;
 3056                 }
 3057         }
 3058         return (mss);
 3059 }
 3060 
 3061 u_int16_t
 3062 pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
 3063 {
 3064 #ifdef INET
 3065         struct sockaddr_in      *dst;
 3066         struct route             ro;
 3067 #endif /* INET */
 3068 #ifdef INET6
 3069         struct sockaddr_in6     *dst6;
 3070         struct route_in6         ro6;
 3071 #endif /* INET6 */
 3072         struct rtentry          *rt = NULL;
 3073         int                      hlen = 0;
 3074         u_int16_t                mss = tcp_mssdflt;
 3075 
 3076         switch (af) {
 3077 #ifdef INET
 3078         case AF_INET:
 3079                 hlen = sizeof(struct ip);
 3080                 bzero(&ro, sizeof(ro));
 3081                 dst = (struct sockaddr_in *)&ro.ro_dst;
 3082                 dst->sin_family = AF_INET;
 3083                 dst->sin_len = sizeof(*dst);
 3084                 dst->sin_addr = addr->v4;
 3085                 rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
 3086                 rt = ro.ro_rt;
 3087                 break;
 3088 #endif /* INET */
 3089 #ifdef INET6
 3090         case AF_INET6:
 3091                 hlen = sizeof(struct ip6_hdr);
 3092                 bzero(&ro6, sizeof(ro6));
 3093                 dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
 3094                 dst6->sin6_family = AF_INET6;
 3095                 dst6->sin6_len = sizeof(*dst6);
 3096                 dst6->sin6_addr = addr->v6;
 3097                 rtalloc_ign((struct route *)&ro6, (RTF_CLONING | RTF_PRCLONING));
 3098                 rt = ro6.ro_rt;
 3099                 break;
 3100 #endif /* INET6 */
 3101         }
 3102 
 3103         if (rt && rt->rt_ifp) {
 3104                 mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
 3105                 mss = max(tcp_mssdflt, mss);
 3106                 RTFREE(rt);
 3107         }
 3108         mss = min(mss, offer);
 3109         mss = max(mss, 64);             /* sanity - at least max opt space */
 3110         return (mss);
 3111 }
 3112 
 3113 void
 3114 pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
 3115 {
 3116         struct pf_rule *r = s->rule.ptr;
 3117 
 3118         s->rt_kif = NULL;
 3119         if (!r->rt || r->rt == PF_FASTROUTE)
 3120                 return;
 3121         switch (s->key[PF_SK_WIRE]->af) {
 3122 #ifdef INET
 3123         case AF_INET:
 3124                 pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
 3125                     &s->nat_src_node);
 3126                 s->rt_kif = r->rpool.cur->kif;
 3127                 break;
 3128 #endif /* INET */
 3129 #ifdef INET6
 3130         case AF_INET6:
 3131                 pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
 3132                     &s->nat_src_node);
 3133                 s->rt_kif = r->rpool.cur->kif;
 3134                 break;
 3135 #endif /* INET6 */
 3136         }
 3137 }
 3138 
 3139 u_int32_t
 3140 pf_tcp_iss(struct pf_pdesc *pd)
 3141 {
 3142         MD5_CTX ctx;
 3143         u_int32_t digest[4];
 3144 
 3145         if (pf_tcp_secret_init == 0) {
 3146                 karc4rand(pf_tcp_secret, sizeof(pf_tcp_secret));
 3147                 MD5Init(&pf_tcp_secret_ctx);
 3148                 MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
 3149                     sizeof(pf_tcp_secret));
 3150                 pf_tcp_secret_init = 1;
 3151         }
 3152         ctx = pf_tcp_secret_ctx;
 3153 
 3154         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof(u_short));
 3155         MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof(u_short));
 3156         if (pd->af == AF_INET6) {
 3157                 MD5Update(&ctx, (char *)&pd->src->v6, sizeof(struct in6_addr));
 3158                 MD5Update(&ctx, (char *)&pd->dst->v6, sizeof(struct in6_addr));
 3159         } else {
 3160                 MD5Update(&ctx, (char *)&pd->src->v4, sizeof(struct in_addr));
 3161                 MD5Update(&ctx, (char *)&pd->dst->v4, sizeof(struct in_addr));
 3162         }
 3163         MD5Final((u_char *)digest, &ctx);
 3164         pf_tcp_iss_off += 4096;
 3165         return (digest[0] + pd->hdr.tcp->th_seq + pf_tcp_iss_off);
 3166 }
 3167 
 3168 int
 3169 pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
 3170     struct pfi_kif *kif, struct mbuf *m, int off, void *h,
 3171     struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
 3172     struct ifqueue *ifq, struct inpcb *inp)
 3173 {
 3174         struct pf_rule          *nr = NULL;
 3175         struct pf_addr          *saddr = pd->src, *daddr = pd->dst;
 3176         sa_family_t              af = pd->af;
 3177         struct pf_rule          *r, *a = NULL;
 3178         struct pf_ruleset       *ruleset = NULL;
 3179         struct pf_src_node      *nsn = NULL;
 3180         struct tcphdr           *th = pd->hdr.tcp;
 3181         struct pf_state_key     *skw = NULL, *sks = NULL;
 3182         struct pf_state_key     *sk = NULL, *nk = NULL;
 3183         u_short                  reason;
 3184         int                      rewrite = 0, hdrlen = 0;
 3185         int                      tag = -1, rtableid = -1;
 3186         int                      asd = 0;
 3187         int                      match = 0;
 3188         int                      state_icmp = 0;
 3189         u_int16_t                sport = 0, dport = 0;
 3190         u_int16_t                bproto_sum = 0, bip_sum = 0;
 3191         u_int8_t                 icmptype = 0, icmpcode = 0;
 3192 
 3193 
 3194         if (direction == PF_IN && pf_check_congestion(ifq)) {
 3195                 REASON_SET(&reason, PFRES_CONGEST);
 3196                 return (PF_DROP);
 3197         }
 3198 
 3199         if (inp != NULL)
 3200                 pd->lookup.done = pf_socket_lookup(direction, pd);
 3201         else if (debug_pfugidhack) { 
 3202                 DPFPRINTF(PF_DEBUG_MISC, ("pf: unlocked lookup\n"));
 3203                 pd->lookup.done = pf_socket_lookup(direction, pd);
 3204         }
 3205 
 3206         switch (pd->proto) {
 3207         case IPPROTO_TCP:
 3208                 sport = th->th_sport;
 3209                 dport = th->th_dport;
 3210                 hdrlen = sizeof(*th);
 3211                 break;
 3212         case IPPROTO_UDP:
 3213                 sport = pd->hdr.udp->uh_sport;
 3214                 dport = pd->hdr.udp->uh_dport;
 3215                 hdrlen = sizeof(*pd->hdr.udp);
 3216                 break;
 3217 #ifdef INET
 3218         case IPPROTO_ICMP:
 3219                 if (pd->af != AF_INET)
 3220                         break;
 3221                 sport = dport = pd->hdr.icmp->icmp_id;
 3222                 hdrlen = sizeof(*pd->hdr.icmp);
 3223                 icmptype = pd->hdr.icmp->icmp_type;
 3224                 icmpcode = pd->hdr.icmp->icmp_code;
 3225 
 3226                 if (icmptype == ICMP_UNREACH ||
 3227                     icmptype == ICMP_SOURCEQUENCH ||
 3228                     icmptype == ICMP_REDIRECT ||
 3229                     icmptype == ICMP_TIMXCEED ||
 3230                     icmptype == ICMP_PARAMPROB)
 3231                         state_icmp++;
 3232                 break;
 3233 #endif /* INET */
 3234 #ifdef INET6
 3235         case IPPROTO_ICMPV6:
 3236                 if (af != AF_INET6)
 3237                         break;
 3238                 sport = dport = pd->hdr.icmp6->icmp6_id;
 3239                 hdrlen = sizeof(*pd->hdr.icmp6);
 3240                 icmptype = pd->hdr.icmp6->icmp6_type;
 3241                 icmpcode = pd->hdr.icmp6->icmp6_code;
 3242 
 3243                 if (icmptype == ICMP6_DST_UNREACH ||
 3244                     icmptype == ICMP6_PACKET_TOO_BIG ||
 3245                     icmptype == ICMP6_TIME_EXCEEDED ||
 3246                     icmptype == ICMP6_PARAM_PROB)
 3247                         state_icmp++;
 3248                 break;
 3249 #endif /* INET6 */
 3250         default:
 3251                 sport = dport = hdrlen = 0;
 3252                 break;
 3253         }
 3254 
 3255         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
 3256 
 3257         /* check packet for BINAT/NAT/RDR */
 3258         if ((nr = pf_get_translation(pd, m, off, direction, kif, &nsn,
 3259             &skw, &sks, &sk, &nk, saddr, daddr, sport, dport)) != NULL) {
 3260                 if (nk == NULL || sk == NULL) {
 3261                         REASON_SET(&reason, PFRES_MEMORY);
 3262                         goto cleanup;
 3263                 }
 3264 
 3265                 if (pd->ip_sum)
 3266                         bip_sum = *pd->ip_sum;
 3267 
 3268                 m->m_flags &= ~M_HASH;
 3269                 switch (pd->proto) {
 3270                 case IPPROTO_TCP:
 3271                         bproto_sum = th->th_sum;
 3272                         pd->proto_sum = &th->th_sum;
 3273 
 3274                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
 3275                             nk->port[pd->sidx] != sport) {
 3276                                 pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
 3277                                     &th->th_sum, &nk->addr[pd->sidx],
 3278                                     nk->port[pd->sidx], 0, af);
 3279                                 pd->sport = &th->th_sport;
 3280                                 sport = th->th_sport;
 3281                         }
 3282 
 3283                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
 3284                             nk->port[pd->didx] != dport) {
 3285                                 pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
 3286                                     &th->th_sum, &nk->addr[pd->didx],
 3287                                     nk->port[pd->didx], 0, af);
 3288                                 dport = th->th_dport;
 3289                                 pd->dport = &th->th_dport;
 3290                         }
 3291                         rewrite++;
 3292                         break;
 3293                 case IPPROTO_UDP:
 3294                         bproto_sum = pd->hdr.udp->uh_sum;
 3295                         pd->proto_sum = &pd->hdr.udp->uh_sum;
 3296 
 3297                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], af) ||
 3298                             nk->port[pd->sidx] != sport) {
 3299                                 pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
 3300                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
 3301                                     &nk->addr[pd->sidx],
 3302                                     nk->port[pd->sidx], 1, af);
 3303                                 sport = pd->hdr.udp->uh_sport;
 3304                                 pd->sport = &pd->hdr.udp->uh_sport;
 3305                         }
 3306 
 3307                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], af) ||
 3308                             nk->port[pd->didx] != dport) {
 3309                                 pf_change_ap(daddr, &pd->hdr.udp->uh_dport,
 3310                                     pd->ip_sum, &pd->hdr.udp->uh_sum,
 3311                                     &nk->addr[pd->didx],
 3312                                     nk->port[pd->didx], 1, af);
 3313                                 dport = pd->hdr.udp->uh_dport;
 3314                                 pd->dport = &pd->hdr.udp->uh_dport;
 3315                         }
 3316                         rewrite++;
 3317                         break;
 3318 #ifdef INET
 3319                 case IPPROTO_ICMP:
 3320                         nk->port[0] = nk->port[1];
 3321                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET))
 3322                                 pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
 3323                                     nk->addr[pd->sidx].v4.s_addr, 0);
 3324 
 3325                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET))
 3326                                 pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
 3327                                     nk->addr[pd->didx].v4.s_addr, 0);
 3328 
 3329                         if (nk->port[1] != pd->hdr.icmp->icmp_id) {
 3330                                 pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
 3331                                     pd->hdr.icmp->icmp_cksum, sport,
 3332                                     nk->port[1], 0);
 3333                                 pd->hdr.icmp->icmp_id = nk->port[1];
 3334                                 pd->sport = &pd->hdr.icmp->icmp_id;
 3335                         }
 3336                         m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
 3337                         break;
 3338 #endif /* INET */
 3339 #ifdef INET6
 3340                 case IPPROTO_ICMPV6:
 3341                         nk->port[0] = nk->port[1];
 3342                         if (PF_ANEQ(saddr, &nk->addr[pd->sidx], AF_INET6))
 3343                                 pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
 3344                                     &nk->addr[pd->sidx], 0);
 3345 
 3346                         if (PF_ANEQ(daddr, &nk->addr[pd->didx], AF_INET6))
 3347                                 pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
 3348                                     &nk->addr[pd->didx], 0);
 3349                         rewrite++;
 3350                         break;
 3351 #endif /* INET */
 3352                 default:
 3353                         switch (af) {
 3354 #ifdef INET
 3355                         case AF_INET:
 3356                                 if (PF_ANEQ(saddr,
 3357                                     &nk->addr[pd->sidx], AF_INET))
 3358                                         pf_change_a(&saddr->v4.s_addr,
 3359                                             pd->ip_sum,
 3360                                             nk->addr[pd->sidx].v4.s_addr, 0);
 3361 
 3362                                 if (PF_ANEQ(daddr,
 3363                                     &nk->addr[pd->didx], AF_INET))
 3364                                         pf_change_a(&daddr->v4.s_addr,
 3365                                             pd->ip_sum,
 3366                                             nk->addr[pd->didx].v4.s_addr, 0);
 3367                                 break;
 3368 #endif /* INET */
 3369 #ifdef INET6
 3370                         case AF_INET6:
 3371                                 if (PF_ANEQ(saddr,
 3372                                     &nk->addr[pd->sidx], AF_INET6))
 3373                                         PF_ACPY(saddr, &nk->addr[pd->sidx], af);
 3374 
 3375                                 if (PF_ANEQ(daddr,
 3376                                     &nk->addr[pd->didx], AF_INET6))
 3377                                         PF_ACPY(saddr, &nk->addr[pd->didx], af);
 3378                                 break;
 3379 #endif /* INET */
 3380                         }
 3381                         break;
 3382                 }
 3383                 if (nr->natpass)
 3384                         r = NULL;
 3385                 pd->nat_rule = nr;
 3386         }
 3387 
 3388         while (r != NULL) {
 3389                 r->evaluations++;
 3390                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 3391                         r = r->skip[PF_SKIP_IFP].ptr;
 3392                 else if (r->direction && r->direction != direction)
 3393                         r = r->skip[PF_SKIP_DIR].ptr;
 3394                 else if (r->af && r->af != af)
 3395                         r = r->skip[PF_SKIP_AF].ptr;
 3396                 else if (r->proto && r->proto != pd->proto)
 3397                         r = r->skip[PF_SKIP_PROTO].ptr;
 3398                 else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
 3399                     r->src.neg, kif))
 3400                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
 3401                 /* tcp/udp only. port_op always 0 in other cases */
 3402                 else if (r->src.port_op && !pf_match_port(r->src.port_op,
 3403                     r->src.port[0], r->src.port[1], sport))
 3404                         r = r->skip[PF_SKIP_SRC_PORT].ptr;
 3405                 else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
 3406                     r->dst.neg, NULL))
 3407                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 3408                 /* tcp/udp only. port_op always 0 in other cases */
 3409                 else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
 3410                     r->dst.port[0], r->dst.port[1], dport))
 3411                         r = r->skip[PF_SKIP_DST_PORT].ptr;
 3412                 /* icmp only. type always 0 in other cases */
 3413                 else if (r->type && r->type != icmptype + 1)
 3414                         r = TAILQ_NEXT(r, entries);
 3415                 /* icmp only. type always 0 in other cases */
 3416                 else if (r->code && r->code != icmpcode + 1)
 3417                         r = TAILQ_NEXT(r, entries);
 3418                 else if (r->tos && !(r->tos == pd->tos))
 3419                         r = TAILQ_NEXT(r, entries);
 3420                 else if (r->rule_flag & PFRULE_FRAGMENT)
 3421                         r = TAILQ_NEXT(r, entries);
 3422                 else if (pd->proto == IPPROTO_TCP &&
 3423                     (r->flagset & th->th_flags) != r->flags)
 3424                         r = TAILQ_NEXT(r, entries);
 3425                 /* tcp/udp only. uid.op always 0 in other cases */
 3426                 else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
 3427                     pf_socket_lookup(direction, pd), 1)) &&
 3428                     !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
 3429                     pd->lookup.uid))
 3430                         r = TAILQ_NEXT(r, entries);
 3431                 /* tcp/udp only. gid.op always 0 in other cases */
 3432                 else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
 3433                     pf_socket_lookup(direction, pd), 1)) &&
 3434                     !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
 3435                     pd->lookup.gid))
 3436                         r = TAILQ_NEXT(r, entries);
 3437                 else if (r->prob &&
 3438                   r->prob <= karc4random())
 3439                         r = TAILQ_NEXT(r, entries);
 3440                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
 3441                         r = TAILQ_NEXT(r, entries);
 3442                 else if (r->os_fingerprint != PF_OSFP_ANY &&
 3443                     (pd->proto != IPPROTO_TCP || !pf_osfp_match(
 3444                     pf_osfp_fingerprint(pd, m, off, th),
 3445                     r->os_fingerprint)))
 3446                         r = TAILQ_NEXT(r, entries);
 3447                 else {
 3448                         if (r->tag)
 3449                                 tag = r->tag;
 3450                         if (r->rtableid >= 0)
 3451                                 rtableid = r->rtableid;
 3452                         if (r->anchor == NULL) {
 3453                                 match = 1;
 3454                                 *rm = r;
 3455                                 *am = a;
 3456                                 *rsm = ruleset;
 3457                                 if ((*rm)->quick)
 3458                                         break;
 3459                                 r = TAILQ_NEXT(r, entries);
 3460                         } else
 3461                                 pf_step_into_anchor(&asd, &ruleset,
 3462                                     PF_RULESET_FILTER, &r, &a, &match);
 3463                 }
 3464                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
 3465                     PF_RULESET_FILTER, &r, &a, &match))
 3466                         break;
 3467         }
 3468         r = *rm;
 3469         a = *am;
 3470         ruleset = *rsm;
 3471 
 3472         REASON_SET(&reason, PFRES_MATCH);
 3473 
 3474         if (r->log || (nr != NULL && nr->log)) {
 3475                 if (rewrite)
 3476                         m_copyback(m, off, hdrlen, pd->hdr.any);
 3477                 PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
 3478                     a, ruleset, pd);
 3479         }
 3480 
 3481         if ((r->action == PF_DROP) &&
 3482             ((r->rule_flag & PFRULE_RETURNRST) ||
 3483             (r->rule_flag & PFRULE_RETURNICMP) ||
 3484             (r->rule_flag & PFRULE_RETURN))) {
 3485                 /* undo NAT changes, if they have taken place */
 3486                 if (nr != NULL) {
 3487                         PF_ACPY(saddr, &sk->addr[pd->sidx], af);
 3488                         PF_ACPY(daddr, &sk->addr[pd->didx], af);
 3489                         if (pd->sport)
 3490                                 *pd->sport = sk->port[pd->sidx];
 3491                         if (pd->dport)
 3492                                 *pd->dport = sk->port[pd->didx];
 3493                         if (pd->proto_sum)
 3494                                 *pd->proto_sum = bproto_sum;
 3495                         if (pd->ip_sum)
 3496                                 *pd->ip_sum = bip_sum;
 3497                         m_copyback(m, off, hdrlen, pd->hdr.any);
 3498                 }
 3499                 if (pd->proto == IPPROTO_TCP &&
 3500                     ((r->rule_flag & PFRULE_RETURNRST) ||
 3501                     (r->rule_flag & PFRULE_RETURN)) &&
 3502                     !(th->th_flags & TH_RST)) {
 3503                         u_int32_t        ack = ntohl(th->th_seq) + pd->p_len;
 3504                         int              len = 0;
 3505                         struct ip       *h4;
 3506 #ifdef INET6
 3507                         struct ip6_hdr  *h6;
 3508 #endif
 3509                         switch (af) {
 3510                         case AF_INET:
 3511                                 h4 = mtod(m, struct ip *);
 3512                                 len = h4->ip_len - off;
 3513                                 break;
 3514 #ifdef INET6
 3515                         case AF_INET6:
 3516                                 h6 = mtod(m, struct ip6_hdr *);
 3517                                 len = h6->ip6_plen - (off - sizeof(*h6));
 3518                                 break;
 3519 #endif
 3520                         }
 3521 
 3522                         if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
 3523                                 REASON_SET(&reason, PFRES_PROTCKSUM);
 3524                         else {
 3525                                 if (th->th_flags & TH_SYN)
 3526                                         ack++;
 3527                                 if (th->th_flags & TH_FIN)
 3528                                         ack++;
 3529                                 pf_send_tcp(r, af, pd->dst,
 3530                                     pd->src, th->th_dport, th->th_sport,
 3531                                     ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
 3532                                     r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
 3533                         }
 3534                 } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
 3535                     r->return_icmp)
 3536                         pf_send_icmp(m, r->return_icmp >> 8,
 3537                             r->return_icmp & 255, af, r);
 3538                 else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
 3539                     r->return_icmp6)
 3540                         pf_send_icmp(m, r->return_icmp6 >> 8,
 3541                             r->return_icmp6 & 255, af, r);
 3542         }
 3543 
 3544         if (r->action == PF_DROP)
 3545                 goto cleanup;
 3546 
 3547         if (pf_tag_packet(m, tag, rtableid)) {
 3548                 REASON_SET(&reason, PFRES_MEMORY);
 3549                 goto cleanup;
 3550         }
 3551 
 3552         if (!state_icmp && (r->keep_state || nr != NULL ||
 3553             (pd->flags & PFDESC_TCP_NORM))) {
 3554                 int action;
 3555                 action = pf_create_state(r, nr, a, pd, nsn, skw, sks, nk, sk, m,
 3556                     off, sport, dport, &rewrite, kif, sm, tag, bproto_sum,
 3557                     bip_sum, hdrlen);
 3558                 if (action != PF_PASS)
 3559                         return (action);
 3560         }
 3561 
 3562         /* copy back packet headers if we performed NAT operations */
 3563         if (rewrite)
 3564                 m_copyback(m, off, hdrlen, pd->hdr.any);
 3565 
 3566         return (PF_PASS);
 3567 
 3568 cleanup:
 3569         if (sk != NULL)
 3570                 kfree(sk, M_PFSTATEKEYPL);
 3571         if (nk != NULL)
 3572                 kfree(nk, M_PFSTATEKEYPL);
 3573         return (PF_DROP);
 3574 }
 3575 
 3576 static __inline int
 3577 pf_create_state(struct pf_rule *r, struct pf_rule *nr, struct pf_rule *a,
 3578     struct pf_pdesc *pd, struct pf_src_node *nsn, struct pf_state_key *skw,
 3579     struct pf_state_key *sks, struct pf_state_key *nk, struct pf_state_key *sk,
 3580     struct mbuf *m, int off, u_int16_t sport, u_int16_t dport, int *rewrite,
 3581     struct pfi_kif *kif, struct pf_state **sm, int tag, u_int16_t bproto_sum,
 3582     u_int16_t bip_sum, int hdrlen)
 3583 {
 3584         struct pf_state         *s = NULL;
 3585         struct pf_src_node      *sn = NULL;
 3586         struct tcphdr           *th = pd->hdr.tcp;
 3587         u_int16_t                mss = tcp_mssdflt;
 3588         u_short                  reason;
 3589 
 3590         /* check maximums */
 3591         if (r->max_states && (r->states_cur >= r->max_states)) {
 3592                 pf_status.lcounters[LCNT_STATES]++;
 3593                 REASON_SET(&reason, PFRES_MAXSTATES);
 3594                 return (PF_DROP);
 3595         }
 3596         /* src node for filter rule */
 3597         if ((r->rule_flag & PFRULE_SRCTRACK ||
 3598             r->rpool.opts & PF_POOL_STICKYADDR) &&
 3599             pf_insert_src_node(&sn, r, pd->src, pd->af) != 0) {
 3600                 REASON_SET(&reason, PFRES_SRCLIMIT);
 3601                 goto csfailed;
 3602         }
 3603         /* src node for translation rule */
 3604         if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
 3605             pf_insert_src_node(&nsn, nr, &sk->addr[pd->sidx], pd->af)) {
 3606                 REASON_SET(&reason, PFRES_SRCLIMIT);
 3607                 goto csfailed;
 3608         }
 3609         s = kmalloc(sizeof(struct pf_state), M_PFSTATEPL, M_NOWAIT|M_ZERO);
 3610         if (s == NULL) {
 3611                 REASON_SET(&reason, PFRES_MEMORY);
 3612                 goto csfailed;
 3613         }
 3614         s->id = 0; /* XXX Do we really need that? not in OpenBSD */
 3615         s->creatorid = 0;
 3616         s->rule.ptr = r;
 3617         s->nat_rule.ptr = nr;
 3618         s->anchor.ptr = a;
 3619         STATE_INC_COUNTERS(s);
 3620         if (r->allow_opts)
 3621                 s->state_flags |= PFSTATE_ALLOWOPTS;
 3622         if (r->rule_flag & PFRULE_STATESLOPPY)
 3623                 s->state_flags |= PFSTATE_SLOPPY;
 3624         s->log = r->log & PF_LOG_ALL;
 3625         if (nr != NULL)
 3626                 s->log |= nr->log & PF_LOG_ALL;
 3627         switch (pd->proto) {
 3628         case IPPROTO_TCP:
 3629                 s->src.seqlo = ntohl(th->th_seq);
 3630                 s->src.seqhi = s->src.seqlo + pd->p_len + 1;
 3631                 if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
 3632                     r->keep_state == PF_STATE_MODULATE) {
 3633                         /* Generate sequence number modulator */
 3634                         if ((s->src.seqdiff = pf_tcp_iss(pd) - s->src.seqlo) ==
 3635                             0)
 3636                                 s->src.seqdiff = 1;
 3637                         pf_change_a(&th->th_seq, &th->th_sum,
 3638                             htonl(s->src.seqlo + s->src.seqdiff), 0);
 3639                         *rewrite = 1;
 3640                 } else
 3641                         s->src.seqdiff = 0;
 3642                 if (th->th_flags & TH_SYN) {
 3643                         s->src.seqhi++;
 3644                         s->src.wscale = pf_get_wscale(m, off,
 3645                             th->th_off, pd->af);
 3646                 }
 3647                 s->src.max_win = MAX(ntohs(th->th_win), 1);
 3648                 if (s->src.wscale & PF_WSCALE_MASK) {
 3649                         /* Remove scale factor from initial window */
 3650                         int win = s->src.max_win;
 3651                         win += 1 << (s->src.wscale & PF_WSCALE_MASK);
 3652                         s->src.max_win = (win - 1) >>
 3653                             (s->src.wscale & PF_WSCALE_MASK);
 3654                 }
 3655                 if (th->th_flags & TH_FIN)
 3656                         s->src.seqhi++;
 3657                 s->dst.seqhi = 1;
 3658                 s->dst.max_win = 1;
 3659                 s->src.state = TCPS_SYN_SENT;
 3660                 s->dst.state = TCPS_CLOSED;
 3661                 s->timeout = PFTM_TCP_FIRST_PACKET;
 3662                 break;
 3663         case IPPROTO_UDP:
 3664                 s->src.state = PFUDPS_SINGLE;
 3665                 s->dst.state = PFUDPS_NO_TRAFFIC;
 3666                 s->timeout = PFTM_UDP_FIRST_PACKET;
 3667                 break;
 3668         case IPPROTO_ICMP:
 3669 #ifdef INET6
 3670         case IPPROTO_ICMPV6:
 3671 #endif
 3672                 s->timeout = PFTM_ICMP_FIRST_PACKET;
 3673                 break;
 3674         default:
 3675                 s->src.state = PFOTHERS_SINGLE;
 3676                 s->dst.state = PFOTHERS_NO_TRAFFIC;
 3677                 s->timeout = PFTM_OTHER_FIRST_PACKET;
 3678         }
 3679 
 3680         s->creation = time_second;
 3681         s->expire = time_second;
 3682 
 3683         if (sn != NULL) {
 3684                 s->src_node = sn;
 3685                 s->src_node->states++;
 3686         }
 3687         if (nsn != NULL) {
 3688                 /* XXX We only modify one side for now. */
 3689                 PF_ACPY(&nsn->raddr, &nk->addr[1], pd->af);
 3690                 s->nat_src_node = nsn;
 3691                 s->nat_src_node->states++;
 3692         }
 3693         if (pd->proto == IPPROTO_TCP) {
 3694                 if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
 3695                     off, pd, th, &s->src, &s->dst)) {
 3696                         REASON_SET(&reason, PFRES_MEMORY);
 3697                         pf_src_tree_remove_state(s);
 3698                         STATE_DEC_COUNTERS(s);
 3699                         kfree(s, M_PFSTATEPL);
 3700                         return (PF_DROP);
 3701                 }
 3702                 if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
 3703                     pf_normalize_tcp_stateful(m, off, pd, &reason, th, s,
 3704                     &s->src, &s->dst, rewrite)) {
 3705                         /* This really shouldn't happen!!! */
 3706                         DPFPRINTF(PF_DEBUG_URGENT,
 3707                             ("pf_normalize_tcp_stateful failed on first pkt"));
 3708                         pf_normalize_tcp_cleanup(s);
 3709                         pf_src_tree_remove_state(s);
 3710                         STATE_DEC_COUNTERS(s);
 3711                         kfree(s, M_PFSTATEPL);
 3712                         return (PF_DROP);
 3713                 }
 3714         }
 3715         s->direction = pd->dir;
 3716 
 3717         if (sk == NULL && pf_state_key_setup(pd, nr, &skw, &sks, &sk, &nk,
 3718             pd->src, pd->dst, sport, dport))
 3719                 goto csfailed;
 3720 
 3721         if (pf_state_insert(BOUND_IFACE(r, kif), skw, sks, s)) {
 3722                 if (pd->proto == IPPROTO_TCP)
 3723                         pf_normalize_tcp_cleanup(s);
 3724                 REASON_SET(&reason, PFRES_STATEINS);
 3725                 pf_src_tree_remove_state(s);
 3726                 STATE_DEC_COUNTERS(s);
 3727                 kfree(s, M_PFSTATEPL);
 3728                 return (PF_DROP);
 3729         } else
 3730                 *sm = s;
 3731 
 3732         pf_set_rt_ifp(s, pd->src);      /* needs s->state_key set */
 3733         if (tag > 0) {
 3734                 pf_tag_ref(tag);
 3735                 s->tag = tag;
 3736         }
 3737         if (pd->proto == IPPROTO_TCP && (th->th_flags & (TH_SYN|TH_ACK)) ==
 3738             TH_SYN && r->keep_state == PF_STATE_SYNPROXY) {
 3739                 s->src.state = PF_TCPS_PROXY_SRC;
 3740                 /* undo NAT changes, if they have taken place */
 3741                 if (nr != NULL) {
 3742                         struct pf_state_key *skt = s->key[PF_SK_WIRE];
 3743                         if (pd->dir == PF_OUT)
 3744                                 skt = s->key[PF_SK_STACK];
 3745                         PF_ACPY(pd->src, &skt->addr[pd->sidx], pd->af);
 3746                         PF_ACPY(pd->dst, &skt->addr[pd->didx], pd->af);
 3747                         if (pd->sport)
 3748                                 *pd->sport = skt->port[pd->sidx];
 3749                         if (pd->dport)
 3750                                 *pd->dport = skt->port[pd->didx];
 3751                         if (pd->proto_sum)
 3752                                 *pd->proto_sum = bproto_sum;
 3753                         if (pd->ip_sum)
 3754                                 *pd->ip_sum = bip_sum;
 3755                         m_copyback(m, off, hdrlen, pd->hdr.any);
 3756                 }
 3757                 s->src.seqhi = htonl(karc4random());
 3758                 /* Find mss option */
 3759                 mss = pf_get_mss(m, off, th->th_off, pd->af);
 3760                 mss = pf_calc_mss(pd->src, pd->af, mss);
 3761                 mss = pf_calc_mss(pd->dst, pd->af, mss);
 3762                 s->src.mss = mss;
 3763                 pf_send_tcp(r, pd->af, pd->dst, pd->src, th->th_dport,
 3764                     th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
 3765                     TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
 3766                 REASON_SET(&reason, PFRES_SYNPROXY);
 3767                 return (PF_SYNPROXY_DROP);
 3768         }
 3769 
 3770         return (PF_PASS);
 3771 
 3772 csfailed:
 3773         if (sk != NULL)
 3774                 kfree(sk, M_PFSTATEKEYPL);
 3775         if (nk != NULL)
 3776                 kfree(nk, M_PFSTATEKEYPL);
 3777 
 3778         if (sn != NULL && sn->states == 0 && sn->expire == 0) {
 3779                 RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
 3780                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 3781                 pf_status.src_nodes--;
 3782                 kfree(sn, M_PFSRCTREEPL);
 3783         }
 3784         if (nsn != sn && nsn != NULL && nsn->states == 0 && nsn->expire == 0) {
 3785                 RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
 3786                 pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
 3787                 pf_status.src_nodes--;
 3788                 kfree(nsn, M_PFSRCTREEPL);
 3789         }
 3790         return (PF_DROP);
 3791 }
 3792 
 3793 int
 3794 pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
 3795     struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
 3796     struct pf_ruleset **rsm)
 3797 {
 3798         struct pf_rule          *r, *a = NULL;
 3799         struct pf_ruleset       *ruleset = NULL;
 3800         sa_family_t              af = pd->af;
 3801         u_short                  reason;
 3802         int                      tag = -1;
 3803         int                      asd = 0;
 3804         int                      match = 0;
 3805 
 3806         r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
 3807         while (r != NULL) {
 3808                 r->evaluations++;
 3809                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 3810                         r = r->skip[PF_SKIP_IFP].ptr;
 3811                 else if (r->direction && r->direction != direction)
 3812                         r = r->skip[PF_SKIP_DIR].ptr;
 3813                 else if (r->af && r->af != af)
 3814                         r = r->skip[PF_SKIP_AF].ptr;
 3815                 else if (r->proto && r->proto != pd->proto)
 3816                         r = r->skip[PF_SKIP_PROTO].ptr;
 3817                 else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
 3818                     r->src.neg, kif))
 3819                         r = r->skip[PF_SKIP_SRC_ADDR].ptr;
 3820                 else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
 3821                     r->dst.neg, NULL))
 3822                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 3823                 else if (r->tos && !(r->tos == pd->tos))
 3824                         r = TAILQ_NEXT(r, entries);
 3825                 else if (r->os_fingerprint != PF_OSFP_ANY)
 3826                         r = TAILQ_NEXT(r, entries);
 3827                 else if (pd->proto == IPPROTO_UDP &&
 3828                     (r->src.port_op || r->dst.port_op))
 3829                         r = TAILQ_NEXT(r, entries);
 3830                 else if (pd->proto == IPPROTO_TCP &&
 3831                     (r->src.port_op || r->dst.port_op || r->flagset))
 3832                         r = TAILQ_NEXT(r, entries);
 3833                 else if ((pd->proto == IPPROTO_ICMP ||
 3834                     pd->proto == IPPROTO_ICMPV6) &&
 3835                     (r->type || r->code))
 3836                         r = TAILQ_NEXT(r, entries);
 3837                 else if (r->prob && r->prob <= karc4random())
 3838                         r = TAILQ_NEXT(r, entries);
 3839                 else if (r->match_tag && !pf_match_tag(m, r, &tag))
 3840                         r = TAILQ_NEXT(r, entries);
 3841                 else {
 3842                         if (r->anchor == NULL) {
 3843                                 match = 1;
 3844                                 *rm = r;
 3845                                 *am = a;
 3846                                 *rsm = ruleset;
 3847                                 if ((*rm)->quick)
 3848                                         break;
 3849                                 r = TAILQ_NEXT(r, entries);
 3850                         } else
 3851                                 pf_step_into_anchor(&asd, &ruleset,
 3852                                     PF_RULESET_FILTER, &r, &a, &match);
 3853                 }
 3854                 if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
 3855                     PF_RULESET_FILTER, &r, &a, &match))
 3856                         break;
 3857         }
 3858         r = *rm;
 3859         a = *am;
 3860         ruleset = *rsm;
 3861 
 3862         REASON_SET(&reason, PFRES_MATCH);
 3863 
 3864         if (r->log)
 3865                 PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
 3866                     pd);
 3867 
 3868         if (r->action != PF_PASS)
 3869                 return (PF_DROP);
 3870 
 3871         if (pf_tag_packet(m, tag, -1)) {
 3872                 REASON_SET(&reason, PFRES_MEMORY);
 3873                 return (PF_DROP);
 3874         }
 3875 
 3876         return (PF_PASS);
 3877 }
 3878 
 3879 int
 3880 pf_tcp_track_full(struct pf_state_peer *src, struct pf_state_peer *dst,
 3881         struct pf_state **state, struct pfi_kif *kif, struct mbuf *m, int off,
 3882         struct pf_pdesc *pd, u_short *reason, int *copyback)
 3883 {
 3884         struct tcphdr           *th = pd->hdr.tcp;
 3885         u_int16_t                win = ntohs(th->th_win);
 3886         u_int32_t                ack, end, seq, orig_seq;
 3887         u_int8_t                 sws, dws;
 3888         int                      ackskew;
 3889 
 3890         if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
 3891                 sws = src->wscale & PF_WSCALE_MASK;
 3892                 dws = dst->wscale & PF_WSCALE_MASK;
 3893         } else
 3894                 sws = dws = 0;
 3895 
 3896         /*
 3897          * Sequence tracking algorithm from Guido van Rooij's paper:
 3898          *   http://www.madison-gurkha.com/publications/tcp_filtering/
 3899          *      tcp_filtering.ps
 3900          */
 3901 
 3902         orig_seq = seq = ntohl(th->th_seq);
 3903         if (src->seqlo == 0) {
 3904                 /* First packet from this end. Set its state */
 3905 
 3906                 if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
 3907                     src->scrub == NULL) {
 3908                         if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
 3909                                 REASON_SET(reason, PFRES_MEMORY);
 3910                                 return (PF_DROP);
 3911                         }
 3912                 }
 3913 
 3914                 /* Deferred generation of sequence number modulator */
 3915                 if (dst->seqdiff && !src->seqdiff) {
 3916                         /* use random iss for the TCP server */
 3917                         while ((src->seqdiff = karc4random() - seq) == 0)
 3918                                 ;
 3919                         ack = ntohl(th->th_ack) - dst->seqdiff;
 3920                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
 3921                             src->seqdiff), 0);
 3922                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
 3923                         *copyback = 1;
 3924                 } else {
 3925                         ack = ntohl(th->th_ack);
 3926                 }
 3927 
 3928                 end = seq + pd->p_len;
 3929                 if (th->th_flags & TH_SYN) {
 3930                         end++;
 3931                         (*state)->sync_flags |= PFSTATE_GOT_SYN2;
 3932                         if (dst->wscale & PF_WSCALE_FLAG) {
 3933                                 src->wscale = pf_get_wscale(m, off, th->th_off,
 3934                                     pd->af);
 3935                                 if (src->wscale & PF_WSCALE_FLAG) {
 3936                                         /* Remove scale factor from initial
 3937                                          * window */
 3938                                         sws = src->wscale & PF_WSCALE_MASK;
 3939                                         win = ((u_int32_t)win + (1 << sws) - 1)
 3940                                             >> sws;
 3941                                         dws = dst->wscale & PF_WSCALE_MASK;
 3942                                 } else {
 3943                                         /* fixup other window */
 3944                                         dst->max_win <<= dst->wscale &
 3945                                             PF_WSCALE_MASK;
 3946                                         /* in case of a retrans SYN|ACK */
 3947                                         dst->wscale = 0;
 3948                                 }
 3949                         }
 3950                 }
 3951                 if (th->th_flags & TH_FIN)
 3952                         end++;
 3953 
 3954                 src->seqlo = seq;
 3955                 if (src->state < TCPS_SYN_SENT)
 3956                         src->state = TCPS_SYN_SENT;
 3957 
 3958                 /*
 3959                  * May need to slide the window (seqhi may have been set by
 3960                  * the crappy stack check or if we picked up the connection
 3961                  * after establishment)
 3962                  */
 3963                 if (src->seqhi == 1 ||
 3964                     SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
 3965                         src->seqhi = end + MAX(1, dst->max_win << dws);
 3966                 if (win > src->max_win)
 3967                         src->max_win = win;
 3968 
 3969         } else {
 3970                 ack = ntohl(th->th_ack) - dst->seqdiff;
 3971                 if (src->seqdiff) {
 3972                         /* Modulate sequence numbers */
 3973                         pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
 3974                             src->seqdiff), 0);
 3975                         pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
 3976                         *copyback = 1;
 3977                 }
 3978                 end = seq + pd->p_len;
 3979                 if (th->th_flags & TH_SYN)
 3980                         end++;
 3981                 if (th->th_flags & TH_FIN)
 3982                         end++;
 3983         }
 3984 
 3985         if ((th->th_flags & TH_ACK) == 0) {
 3986                 /* Let it pass through the ack skew check */
 3987                 ack = dst->seqlo;
 3988         } else if ((ack == 0 &&
 3989             (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
 3990             /* broken tcp stacks do not set ack */
 3991             (dst->state < TCPS_SYN_SENT)) {
 3992                 /*
 3993                  * Many stacks (ours included) will set the ACK number in an
 3994                  * FIN|ACK if the SYN times out -- no sequence to ACK.
 3995                  */
 3996                 ack = dst->seqlo;
 3997         }
 3998 
 3999         if (seq == end) {
 4000                 /* Ease sequencing restrictions on no data packets */
 4001                 seq = src->seqlo;
 4002                 end = seq;
 4003         }
 4004 
 4005         ackskew = dst->seqlo - ack;
 4006 
 4007 
 4008         /*
 4009          * Need to demodulate the sequence numbers in any TCP SACK options
 4010          * (Selective ACK). We could optionally validate the SACK values
 4011          * against the current ACK window, either forwards or backwards, but
 4012          * I'm not confident that SACK has been implemented properly
 4013          * everywhere. It wouldn't surprise me if several stacks accidently
 4014          * SACK too far backwards of previously ACKed data. There really aren't
 4015          * any security implications of bad SACKing unless the target stack
 4016          * doesn't validate the option length correctly. Someone trying to
 4017          * spoof into a TCP connection won't bother blindly sending SACK
 4018          * options anyway.
 4019          */
 4020         if (dst->seqdiff && (th->th_off << 2) > sizeof(struct tcphdr)) {
 4021                 if (pf_modulate_sack(m, off, pd, th, dst))
 4022                         *copyback = 1;
 4023         }
 4024 
 4025 
 4026 #define MAXACKWINDOW (0xffff + 1500)    /* 1500 is an arbitrary fudge factor */
 4027         if (SEQ_GEQ(src->seqhi, end) &&
 4028             /* Last octet inside other's window space */
 4029             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
 4030             /* Retrans: not more than one window back */
 4031             (ackskew >= -MAXACKWINDOW) &&
 4032             /* Acking not more than one reassembled fragment backwards */
 4033             (ackskew <= (MAXACKWINDOW << sws)) &&
 4034             /* Acking not more than one window forward */
 4035             ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
 4036             (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
 4037             (pd->flags & PFDESC_IP_REAS) == 0)) {
 4038             /* Require an exact/+1 sequence match on resets when possible */
 4039 
 4040                 if (dst->scrub || src->scrub) {
 4041                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
 4042                             *state, src, dst, copyback))
 4043                                 return (PF_DROP);
 4044                 }
 4045 
 4046                 /* update max window */
 4047                 if (src->max_win < win)
 4048                         src->max_win = win;
 4049                 /* synchronize sequencing */
 4050                 if (SEQ_GT(end, src->seqlo))
 4051                         src->seqlo = end;
 4052                 /* slide the window of what the other end can send */
 4053                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
 4054                         dst->seqhi = ack + MAX((win << sws), 1);
 4055 
 4056 
 4057                 /* update states */
 4058                 if (th->th_flags & TH_SYN)
 4059                         if (src->state < TCPS_SYN_SENT)
 4060                                 src->state = TCPS_SYN_SENT;
 4061                 if (th->th_flags & TH_FIN)
 4062                         if (src->state < TCPS_CLOSING)
 4063                                 src->state = TCPS_CLOSING;
 4064                 if (th->th_flags & TH_ACK) {
 4065                         if (dst->state == TCPS_SYN_SENT) {
 4066                                 dst->state = TCPS_ESTABLISHED;
 4067                                 if (src->state == TCPS_ESTABLISHED &&
 4068                                     (*state)->src_node != NULL &&
 4069                                     pf_src_connlimit(state)) {
 4070                                         REASON_SET(reason, PFRES_SRCLIMIT);
 4071                                         return (PF_DROP);
 4072                                 }
 4073                         } else if (dst->state == TCPS_CLOSING)
 4074                                 dst->state = TCPS_FIN_WAIT_2;
 4075                 }
 4076                 if (th->th_flags & TH_RST)
 4077                         src->state = dst->state = TCPS_TIME_WAIT;
 4078 
 4079                 /* update expire time */
 4080                 (*state)->expire = time_second;
 4081                 if (src->state >= TCPS_FIN_WAIT_2 &&
 4082                     dst->state >= TCPS_FIN_WAIT_2)
 4083                         (*state)->timeout = PFTM_TCP_CLOSED;
 4084                 else if (src->state >= TCPS_CLOSING &&
 4085                     dst->state >= TCPS_CLOSING)
 4086                         (*state)->timeout = PFTM_TCP_FIN_WAIT;
 4087                 else if (src->state < TCPS_ESTABLISHED ||
 4088                     dst->state < TCPS_ESTABLISHED)
 4089                         (*state)->timeout = PFTM_TCP_OPENING;
 4090                 else if (src->state >= TCPS_CLOSING ||
 4091                     dst->state >= TCPS_CLOSING)
 4092                         (*state)->timeout = PFTM_TCP_CLOSING;
 4093                 else
 4094                         (*state)->timeout = PFTM_TCP_ESTABLISHED;
 4095 
 4096                 /* Fall through to PASS packet */
 4097 
 4098         } else if ((dst->state < TCPS_SYN_SENT ||
 4099                 dst->state >= TCPS_FIN_WAIT_2 ||
 4100                 src->state >= TCPS_FIN_WAIT_2) &&
 4101             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
 4102             /* Within a window forward of the originating packet */
 4103             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
 4104             /* Within a window backward of the originating packet */
 4105 
 4106                 /*
 4107                  * This currently handles three situations:
 4108                  *  1) Stupid stacks will shotgun SYNs before their peer
 4109                  *     replies.
 4110                  *  2) When PF catches an already established stream (the
 4111                  *     firewall rebooted, the state table was flushed, routes
 4112                  *     changed...)
 4113                  *  3) Packets get funky immediately after the connection
 4114                  *     closes (this should catch Solaris spurious ACK|FINs
 4115                  *     that web servers like to spew after a close)
 4116                  *
 4117                  * This must be a little more careful than the above code
 4118                  * since packet floods will also be caught here. We don't
 4119                  * update the TTL here to mitigate the damage of a packet
 4120                  * flood and so the same code can handle awkward establishment
 4121                  * and a loosened connection close.
 4122                  * In the establishment case, a correct peer response will
 4123                  * validate the connection, go through the normal state code
 4124                  * and keep updating the state TTL.
 4125                  */
 4126 
 4127                 if (pf_status.debug >= PF_DEBUG_MISC) {
 4128                         kprintf("pf: loose state match: ");
 4129                         pf_print_state(*state);
 4130                         pf_print_flags(th->th_flags);
 4131                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
 4132                             "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack, pd->p_len,
 4133                             ackskew, (unsigned long long)(*state)->packets[0],
 4134                             (unsigned long long)(*state)->packets[1],
 4135                             pd->dir == PF_IN ? "in" : "out",
 4136                             pd->dir == (*state)->direction ? "fwd" : "rev");
 4137                 }
 4138 
 4139                 if (dst->scrub || src->scrub) {
 4140                         if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
 4141                             *state, src, dst, copyback))
 4142                                 return (PF_DROP);
 4143                 }
 4144 
 4145                 /* update max window */
 4146                 if (src->max_win < win)
 4147                         src->max_win = win;
 4148                 /* synchronize sequencing */
 4149                 if (SEQ_GT(end, src->seqlo))
 4150                         src->seqlo = end;
 4151                 /* slide the window of what the other end can send */
 4152                 if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
 4153                         dst->seqhi = ack + MAX((win << sws), 1);
 4154 
 4155                 /*
 4156                  * Cannot set dst->seqhi here since this could be a shotgunned
 4157                  * SYN and not an already established connection.
 4158                  */
 4159 
 4160                 if (th->th_flags & TH_FIN)
 4161                         if (src->state < TCPS_CLOSING)
 4162                                 src->state = TCPS_CLOSING;
 4163                 if (th->th_flags & TH_RST)
 4164                         src->state = dst->state = TCPS_TIME_WAIT;
 4165 
 4166                 /* Fall through to PASS packet */
 4167 
 4168         } else if ((*state)->pickup_mode == PF_PICKUPS_HASHONLY ||
 4169                     ((*state)->pickup_mode == PF_PICKUPS_ENABLED &&
 4170                      ((*state)->sync_flags & PFSTATE_GOT_SYN_MASK) !=
 4171                       PFSTATE_GOT_SYN_MASK)) {
 4172                 /*
 4173                  * If pickup mode is hash only, do not fail on sequence checks.
 4174                  *
 4175                  * If pickup mode is enabled and we did not see the SYN in
 4176                  * both direction, do not fail on sequence checks because
 4177                  * we do not have complete information on window scale.
 4178                  *
 4179                  * Adjust expiration and fall through to PASS packet.
 4180                  * XXX Add a FIN check to reduce timeout?
 4181                  */
 4182                 (*state)->expire = time_second;
 4183         } else  {
 4184                 /*
 4185                  * Failure processing
 4186                  */
 4187                 if ((*state)->dst.state == TCPS_SYN_SENT &&
 4188                     (*state)->src.state == TCPS_SYN_SENT) {
 4189                         /* Send RST for state mismatches during handshake */
 4190                         if (!(th->th_flags & TH_RST))
 4191                                 pf_send_tcp((*state)->rule.ptr, pd->af,
 4192                                     pd->dst, pd->src, th->th_dport,
 4193                                     th->th_sport, ntohl(th->th_ack), 0,
 4194                                     TH_RST, 0, 0,
 4195                                     (*state)->rule.ptr->return_ttl, 1, 0,
 4196                                     pd->eh, kif->pfik_ifp);
 4197                         src->seqlo = 0;
 4198                         src->seqhi = 1;
 4199                         src->max_win = 1;
 4200                 } else if (pf_status.debug >= PF_DEBUG_MISC) {
 4201                         kprintf("pf: BAD state: ");
 4202                         pf_print_state(*state);
 4203                         pf_print_flags(th->th_flags);
 4204                         kprintf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
 4205                             "pkts=%llu:%llu dir=%s,%s\n",
 4206                             seq, orig_seq, ack, pd->p_len, ackskew,
 4207                             (unsigned long long)(*state)->packets[0],
 4208                                 (unsigned long long)(*state)->packets[1],
 4209                             pd->dir == PF_IN ? "in" : "out",
 4210                             pd->dir == (*state)->direction ? "fwd" : "rev");
 4211                         kprintf("pf: State failure on: %c %c %c %c | %c %c\n",
 4212                             SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
 4213                             SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
 4214                             ' ': '2',
 4215                             (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
 4216                             (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
 4217                             SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
 4218                             SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
 4219                 }
 4220                 REASON_SET(reason, PFRES_BADSTATE);
 4221                 return (PF_DROP);
 4222         }
 4223 
 4224         return (PF_PASS);
 4225 }
 4226 
 4227 int
 4228 pf_tcp_track_sloppy(struct pf_state_peer *src, struct pf_state_peer *dst,
 4229         struct pf_state **state, struct pf_pdesc *pd, u_short *reason)
 4230 {
 4231         struct tcphdr           *th = pd->hdr.tcp;
 4232 
 4233         if (th->th_flags & TH_SYN)
 4234                 if (src->state < TCPS_SYN_SENT)
 4235                         src->state = TCPS_SYN_SENT;
 4236         if (th->th_flags & TH_FIN)
 4237                 if (src->state < TCPS_CLOSING)
 4238                         src->state = TCPS_CLOSING;
 4239         if (th->th_flags & TH_ACK) {
 4240                 if (dst->state == TCPS_SYN_SENT) {
 4241                         dst->state = TCPS_ESTABLISHED;
 4242                         if (src->state == TCPS_ESTABLISHED &&
 4243                             (*state)->src_node != NULL &&
 4244                             pf_src_connlimit(state)) {
 4245                                 REASON_SET(reason, PFRES_SRCLIMIT);
 4246                                 return (PF_DROP);
 4247                         }
 4248                 } else if (dst->state == TCPS_CLOSING) {
 4249                         dst->state = TCPS_FIN_WAIT_2;
 4250                 } else if (src->state == TCPS_SYN_SENT &&
 4251                     dst->state < TCPS_SYN_SENT) {
 4252                         /*
 4253                          * Handle a special sloppy case where we only see one
 4254                          * half of the connection. If there is a ACK after
 4255                          * the initial SYN without ever seeing a packet from
 4256                          * the destination, set the connection to established.
 4257                          */
 4258                         dst->state = src->state = TCPS_ESTABLISHED;
 4259                         if ((*state)->src_node != NULL &&
 4260                             pf_src_connlimit(state)) {
 4261                                 REASON_SET(reason, PFRES_SRCLIMIT);
 4262                                 return (PF_DROP);
 4263                         }
 4264                 } else if (src->state == TCPS_CLOSING &&
 4265                     dst->state == TCPS_ESTABLISHED &&
 4266                     dst->seqlo == 0) {
 4267                         /*
 4268                          * Handle the closing of half connections where we
 4269                          * don't see the full bidirectional FIN/ACK+ACK
 4270                          * handshake.
 4271                          */
 4272                         dst->state = TCPS_CLOSING;
 4273                 }
 4274         }
 4275         if (th->th_flags & TH_RST)
 4276                 src->state = dst->state = TCPS_TIME_WAIT;
 4277 
 4278         /* update expire time */
 4279         (*state)->expire = time_second;
 4280         if (src->state >= TCPS_FIN_WAIT_2 &&
 4281             dst->state >= TCPS_FIN_WAIT_2)
 4282                 (*state)->timeout = PFTM_TCP_CLOSED;
 4283         else if (src->state >= TCPS_CLOSING &&
 4284             dst->state >= TCPS_CLOSING)
 4285                 (*state)->timeout = PFTM_TCP_FIN_WAIT;
 4286         else if (src->state < TCPS_ESTABLISHED ||
 4287             dst->state < TCPS_ESTABLISHED)
 4288                 (*state)->timeout = PFTM_TCP_OPENING;
 4289         else if (src->state >= TCPS_CLOSING ||
 4290             dst->state >= TCPS_CLOSING)
 4291                 (*state)->timeout = PFTM_TCP_CLOSING;
 4292         else
 4293                 (*state)->timeout = PFTM_TCP_ESTABLISHED;
 4294 
 4295         return (PF_PASS);
 4296 }
 4297 
 4298 int
 4299 pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
 4300     struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
 4301     u_short *reason)
 4302 {
 4303         struct pf_state_key_cmp  key;
 4304         struct tcphdr           *th = pd->hdr.tcp;
 4305         int                      copyback = 0;
 4306         struct pf_state_peer    *src, *dst;
 4307         struct pf_state_key     *sk;
 4308 
 4309         key.af = pd->af;
 4310         key.proto = IPPROTO_TCP;
 4311         if (direction == PF_IN) {       /* wire side, straight */
 4312                 PF_ACPY(&key.addr[0], pd->src, key.af);
 4313                 PF_ACPY(&key.addr[1], pd->dst, key.af);
 4314                 key.port[0] = th->th_sport;
 4315                 key.port[1] = th->th_dport;
 4316         } else {                        /* stack side, reverse */
 4317                 PF_ACPY(&key.addr[1], pd->src, key.af);
 4318                 PF_ACPY(&key.addr[0], pd->dst, key.af);
 4319                 key.port[1] = th->th_sport;
 4320                 key.port[0] = th->th_dport;
 4321         }
 4322 
 4323         STATE_LOOKUP(kif, &key, direction, *state, m);
 4324 
 4325         if (direction == (*state)->direction) {
 4326                 src = &(*state)->src;
 4327                 dst = &(*state)->dst;
 4328         } else {
 4329                 src = &(*state)->dst;
 4330                 dst = &(*state)->src;
 4331         }
 4332 
 4333         sk = (*state)->key[pd->didx];
 4334 
 4335         if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
 4336                 if (direction != (*state)->direction) {
 4337                         REASON_SET(reason, PFRES_SYNPROXY);
 4338                         return (PF_SYNPROXY_DROP);
 4339                 }
 4340                 if (th->th_flags & TH_SYN) {
 4341                         if (ntohl(th->th_seq) != (*state)->src.seqlo) {
 4342                                 REASON_SET(reason, PFRES_SYNPROXY);
 4343                                 return (PF_DROP);
 4344                         }
 4345                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
 4346                             pd->src, th->th_dport, th->th_sport,
 4347                             (*state)->src.seqhi, ntohl(th->th_seq) + 1,
 4348                             TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
 4349                             0, NULL, NULL);
 4350                         REASON_SET(reason, PFRES_SYNPROXY);
 4351                         return (PF_SYNPROXY_DROP);
 4352                 } else if (!(th->th_flags & TH_ACK) ||
 4353                     (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
 4354                     (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
 4355                         REASON_SET(reason, PFRES_SYNPROXY);
 4356                         return (PF_DROP);
 4357                 } else if ((*state)->src_node != NULL &&
 4358                     pf_src_connlimit(state)) {
 4359                         REASON_SET(reason, PFRES_SRCLIMIT);
 4360                         return (PF_DROP);
 4361                 } else
 4362                         (*state)->src.state = PF_TCPS_PROXY_DST;
 4363         }
 4364         if ((*state)->src.state == PF_TCPS_PROXY_DST) {
 4365                 if (direction == (*state)->direction) {
 4366                         if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
 4367                             (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
 4368                             (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
 4369                                 REASON_SET(reason, PFRES_SYNPROXY);
 4370                                 return (PF_DROP);
 4371                         }
 4372                         (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
 4373                         if ((*state)->dst.seqhi == 1)
 4374                                 (*state)->dst.seqhi = htonl(karc4random());
 4375                         pf_send_tcp((*state)->rule.ptr, pd->af,
 4376                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
 4377                             sk->port[pd->sidx], sk->port[pd->didx],
 4378                             (*state)->dst.seqhi, 0, TH_SYN, 0,
 4379                             (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
 4380                         REASON_SET(reason, PFRES_SYNPROXY);
 4381                         return (PF_SYNPROXY_DROP);
 4382                 } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
 4383                     (TH_SYN|TH_ACK)) ||
 4384                     (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
 4385                         REASON_SET(reason, PFRES_SYNPROXY);
 4386                         return (PF_DROP);
 4387                 } else {
 4388                         (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
 4389                         (*state)->dst.seqlo = ntohl(th->th_seq);
 4390                         pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
 4391                             pd->src, th->th_dport, th->th_sport,
 4392                             ntohl(th->th_ack), ntohl(th->th_seq) + 1,
 4393                             TH_ACK, (*state)->src.max_win, 0, 0, 0,
 4394                             (*state)->tag, NULL, NULL);
 4395                         pf_send_tcp((*state)->rule.ptr, pd->af,
 4396                             &sk->addr[pd->sidx], &sk->addr[pd->didx],
 4397                             sk->port[pd->sidx], sk->port[pd->didx],
 4398                             (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
 4399                             TH_ACK, (*state)->dst.max_win, 0, 0, 1,
 4400                             0, NULL, NULL);
 4401                         (*state)->src.seqdiff = (*state)->dst.seqhi -
 4402                             (*state)->src.seqlo;
 4403                         (*state)->dst.seqdiff = (*state)->src.seqhi -
 4404                             (*state)->dst.seqlo;
 4405                         (*state)->src.seqhi = (*state)->src.seqlo +
 4406                             (*state)->dst.max_win;
 4407                         (*state)->dst.seqhi = (*state)->dst.seqlo +
 4408                             (*state)->src.max_win;
 4409                         (*state)->src.wscale = (*state)->dst.wscale = 0;
 4410                         (*state)->src.state = (*state)->dst.state =
 4411                             TCPS_ESTABLISHED;
 4412                         REASON_SET(reason, PFRES_SYNPROXY);
 4413                         return (PF_SYNPROXY_DROP);
 4414                 }
 4415         }
 4416 
 4417         if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
 4418             dst->state >= TCPS_FIN_WAIT_2 &&
 4419             src->state >= TCPS_FIN_WAIT_2) {
 4420                 if (pf_status.debug >= PF_DEBUG_MISC) {
 4421                         kprintf("pf: state reuse ");
 4422                         pf_print_state(*state);
 4423                         pf_print_flags(th->th_flags);
 4424                         kprintf("\n");
 4425                 }
 4426                 /* XXX make sure it's the same direction ?? */
 4427                 (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
 4428                 pf_unlink_state(*state);
 4429                 *state = NULL;
 4430                 return (PF_DROP);
 4431         }
 4432 
 4433         if ((*state)->state_flags & PFSTATE_SLOPPY) {
 4434                 if (pf_tcp_track_sloppy(src, dst, state, pd, reason) == PF_DROP)
 4435                         return (PF_DROP);
 4436         } else {
 4437                 if (pf_tcp_track_full(src, dst, state, kif, m, off, pd, reason,
 4438                     &copyback) == PF_DROP)
 4439                         return (PF_DROP);
 4440         }
 4441 
 4442         /* translate source/destination address, if necessary */
 4443         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
 4444                 struct pf_state_key *nk = (*state)->key[pd->didx];
 4445 
 4446                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
 4447                     nk->port[pd->sidx] != th->th_sport)  {
 4448                         /*
 4449                          * The translated source address may be completely
 4450                          * unrelated to the saved link header, make sure
 4451                          * a bridge doesn't try to use it.
 4452                          */
 4453                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
 4454                         m->m_flags &= ~M_HASH;
 4455                         pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
 4456                             &th->th_sum, &nk->addr[pd->sidx],
 4457                             nk->port[pd->sidx], 0, pd->af);
 4458                 }
 4459 
 4460                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
 4461                     nk->port[pd->didx] != th->th_dport) {
 4462                         /*
 4463                          * If we don't redispatch the packet will go into
 4464                          * the protocol stack on the wrong cpu for the
 4465                          * post-translated address.
 4466                          */
 4467                         m->m_flags &= ~M_HASH;
 4468                         pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
 4469                             &th->th_sum, &nk->addr[pd->didx],
 4470                             nk->port[pd->didx], 0, pd->af);
 4471                 }
 4472                 copyback = 1;
 4473         }
 4474 
 4475         /* Copyback sequence modulation or stateful scrub changes if needed */
 4476         if (copyback)
 4477                 m_copyback(m, off, sizeof(*th), (caddr_t)th);
 4478 
 4479         return (PF_PASS);
 4480 }
 4481 
 4482 int
 4483 pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
 4484     struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
 4485 {
 4486         struct pf_state_peer    *src, *dst;
 4487         struct pf_state_key_cmp  key;
 4488         struct udphdr           *uh = pd->hdr.udp;
 4489 
 4490         key.af = pd->af;
 4491         key.proto = IPPROTO_UDP;
 4492         if (direction == PF_IN) {       /* wire side, straight */
 4493                 PF_ACPY(&key.addr[0], pd->src, key.af);
 4494                 PF_ACPY(&key.addr[1], pd->dst, key.af);
 4495                 key.port[0] = uh->uh_sport;
 4496                 key.port[1] = uh->uh_dport;
 4497         } else {                        /* stack side, reverse */
 4498                 PF_ACPY(&key.addr[1], pd->src, key.af);
 4499                 PF_ACPY(&key.addr[0], pd->dst, key.af);
 4500                 key.port[1] = uh->uh_sport;
 4501                 key.port[0] = uh->uh_dport;
 4502         }
 4503 
 4504         STATE_LOOKUP(kif, &key, direction, *state, m);
 4505 
 4506         if (direction == (*state)->direction) {
 4507                 src = &(*state)->src;
 4508                 dst = &(*state)->dst;
 4509         } else {
 4510                 src = &(*state)->dst;
 4511                 dst = &(*state)->src;
 4512         }
 4513 
 4514         /* update states */
 4515         if (src->state < PFUDPS_SINGLE)
 4516                 src->state = PFUDPS_SINGLE;
 4517         if (dst->state == PFUDPS_SINGLE)
 4518                 dst->state = PFUDPS_MULTIPLE;
 4519 
 4520         /* update expire time */
 4521         (*state)->expire = time_second;
 4522         if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
 4523                 (*state)->timeout = PFTM_UDP_MULTIPLE;
 4524         else
 4525                 (*state)->timeout = PFTM_UDP_SINGLE;
 4526 
 4527         /* translate source/destination address, if necessary */
 4528         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
 4529                 struct pf_state_key *nk = (*state)->key[pd->didx];
 4530 
 4531                 if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], pd->af) ||
 4532                     nk->port[pd->sidx] != uh->uh_sport) {
 4533                         /*
 4534                          * The translated source address may be completely
 4535                          * unrelated to the saved link header, make sure
 4536                          * a bridge doesn't try to use it.
 4537                          */
 4538                         m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
 4539                         m->m_flags &= ~M_HASH;
 4540                         pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
 4541                             &uh->uh_sum, &nk->addr[pd->sidx],
 4542                             nk->port[pd->sidx], 1, pd->af);
 4543                 }
 4544 
 4545                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], pd->af) ||
 4546                     nk->port[pd->didx] != uh->uh_dport) {
 4547                         /*
 4548                          * If we don't redispatch the packet will go into
 4549                          * the protocol stack on the wrong cpu for the
 4550                          * post-translated address.
 4551                          */
 4552                         m->m_flags &= ~M_HASH;
 4553                         pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
 4554                             &uh->uh_sum, &nk->addr[pd->didx],
 4555                             nk->port[pd->didx], 1, pd->af);
 4556                 }
 4557                 m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
 4558         }
 4559 
 4560         return (PF_PASS);
 4561 }
 4562 
 4563 int
 4564 pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
 4565     struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
 4566 {
 4567         struct pf_addr  *saddr = pd->src, *daddr = pd->dst;
 4568         u_int16_t        icmpid = 0, *icmpsum;
 4569         u_int8_t         icmptype;
 4570         int              state_icmp = 0;
 4571         struct pf_state_key_cmp key;
 4572 
 4573         switch (pd->proto) {
 4574 #ifdef INET
 4575         case IPPROTO_ICMP:
 4576                 icmptype = pd->hdr.icmp->icmp_type;
 4577                 icmpid = pd->hdr.icmp->icmp_id;
 4578                 icmpsum = &pd->hdr.icmp->icmp_cksum;
 4579 
 4580                 if (icmptype == ICMP_UNREACH ||
 4581                     icmptype == ICMP_SOURCEQUENCH ||
 4582                     icmptype == ICMP_REDIRECT ||
 4583                     icmptype == ICMP_TIMXCEED ||
 4584                     icmptype == ICMP_PARAMPROB)
 4585                         state_icmp++;
 4586                 break;
 4587 #endif /* INET */
 4588 #ifdef INET6
 4589         case IPPROTO_ICMPV6:
 4590                 icmptype = pd->hdr.icmp6->icmp6_type;
 4591                 icmpid = pd->hdr.icmp6->icmp6_id;
 4592                 icmpsum = &pd->hdr.icmp6->icmp6_cksum;
 4593 
 4594                 if (icmptype == ICMP6_DST_UNREACH ||
 4595                     icmptype == ICMP6_PACKET_TOO_BIG ||
 4596                     icmptype == ICMP6_TIME_EXCEEDED ||
 4597                     icmptype == ICMP6_PARAM_PROB)
 4598                         state_icmp++;
 4599                 break;
 4600 #endif /* INET6 */
 4601         }
 4602 
 4603         if (!state_icmp) {
 4604 
 4605                 /*
 4606                  * ICMP query/reply message not related to a TCP/UDP packet.
 4607                  * Search for an ICMP state.
 4608                  */
 4609                 key.af = pd->af;
 4610                 key.proto = pd->proto;
 4611                 key.port[0] = key.port[1] = icmpid;
 4612                 if (direction == PF_IN) {       /* wire side, straight */
 4613                         PF_ACPY(&key.addr[0], pd->src, key.af);
 4614                         PF_ACPY(&key.addr[1], pd->dst, key.af);
 4615                 } else {                        /* stack side, reverse */
 4616                         PF_ACPY(&key.addr[1], pd->src, key.af);
 4617                         PF_ACPY(&key.addr[0], pd->dst, key.af);
 4618                 }
 4619 
 4620                 STATE_LOOKUP(kif, &key, direction, *state, m);
 4621 
 4622                 (*state)->expire = time_second;
 4623                 (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
 4624 
 4625                 /* translate source/destination address, if necessary */
 4626                 if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
 4627                         struct pf_state_key *nk = (*state)->key[pd->didx];
 4628 
 4629                         switch (pd->af) {
 4630 #ifdef INET
 4631                         case AF_INET:
 4632                                 if (PF_ANEQ(pd->src,
 4633                                     &nk->addr[pd->sidx], AF_INET))
 4634                                         pf_change_a(&saddr->v4.s_addr,
 4635                                             pd->ip_sum,
 4636                                             nk->addr[pd->sidx].v4.s_addr, 0);
 4637 
 4638                                 if (PF_ANEQ(pd->dst, &nk->addr[pd->didx],
 4639                                     AF_INET))
 4640                                         pf_change_a(&daddr->v4.s_addr,
 4641                                             pd->ip_sum,
 4642                                             nk->addr[pd->didx].v4.s_addr, 0);
 4643 
 4644                                 if (nk->port[0] !=
 4645                                     pd->hdr.icmp->icmp_id) {
 4646                                         pd->hdr.icmp->icmp_cksum =
 4647                                             pf_cksum_fixup(
 4648                                             pd->hdr.icmp->icmp_cksum, icmpid,
 4649                                             nk->port[pd->sidx], 0);
 4650                                         pd->hdr.icmp->icmp_id =
 4651                                             nk->port[pd->sidx];
 4652                                 }
 4653 
 4654                                 m_copyback(m, off, ICMP_MINLEN,
 4655                                     (caddr_t)pd->hdr.icmp);
 4656                                 break;
 4657 #endif /* INET */
 4658 #ifdef INET6
 4659                         case AF_INET6:
 4660                                 if (PF_ANEQ(pd->src,
 4661                                     &nk->addr[pd->sidx], AF_INET6))
 4662                                         pf_change_a6(saddr,
 4663                                             &pd->hdr.icmp6->icmp6_cksum,
 4664                                             &nk->addr[pd->sidx], 0);
 4665 
 4666                                 if (PF_ANEQ(pd->dst,
 4667                                     &nk->addr[pd->didx], AF_INET6))
 4668                                         pf_change_a6(daddr,
 4669                                             &pd->hdr.icmp6->icmp6_cksum,
 4670                                             &nk->addr[pd->didx], 0);
 4671 
 4672                                 m_copyback(m, off,
 4673                                         sizeof(struct icmp6_hdr),
 4674                                         (caddr_t)pd->hdr.icmp6);
 4675                                 break;
 4676 #endif /* INET6 */
 4677                         }
 4678                 }
 4679                 return (PF_PASS);
 4680 
 4681         } else {
 4682                 /*
 4683                  * ICMP error message in response to a TCP/UDP packet.
 4684                  * Extract the inner TCP/UDP header and search for that state.
 4685                  */
 4686 
 4687                 struct pf_pdesc pd2;
 4688 #ifdef INET
 4689                 struct ip       h2;
 4690 #endif /* INET */
 4691 #ifdef INET6
 4692                 struct ip6_hdr  h2_6;
 4693                 int             terminal = 0;
 4694 #endif /* INET6 */
 4695                 int             ipoff2;
 4696                 int             off2;
 4697 
 4698                 pd2.af = pd->af;
 4699                 /* Payload packet is from the opposite direction. */
 4700                 pd2.sidx = (direction == PF_IN) ? 1 : 0;
 4701                 pd2.didx = (direction == PF_IN) ? 0 : 1;
 4702                 switch (pd->af) {
 4703 #ifdef INET
 4704                 case AF_INET:
 4705                         /* offset of h2 in mbuf chain */
 4706                         ipoff2 = off + ICMP_MINLEN;
 4707 
 4708                         if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
 4709                             NULL, reason, pd2.af)) {
 4710                                 DPFPRINTF(PF_DEBUG_MISC,
 4711                                     ("pf: ICMP error message too short "
 4712                                     "(ip)\n"));
 4713                                 return (PF_DROP);
 4714                         }
 4715                         /*
 4716                          * ICMP error messages don't refer to non-first
 4717                          * fragments
 4718                          */
 4719                         if (h2.ip_off & htons(IP_OFFMASK)) {
 4720                                 REASON_SET(reason, PFRES_FRAG);
 4721                                 return (PF_DROP);
 4722                         }
 4723 
 4724                         /* offset of protocol header that follows h2 */
 4725                         off2 = ipoff2 + (h2.ip_hl << 2);
 4726 
 4727                         pd2.proto = h2.ip_p;
 4728                         pd2.src = (struct pf_addr *)&h2.ip_src;
 4729                         pd2.dst = (struct pf_addr *)&h2.ip_dst;
 4730                         pd2.ip_sum = &h2.ip_sum;
 4731                         break;
 4732 #endif /* INET */
 4733 #ifdef INET6
 4734                 case AF_INET6:
 4735                         ipoff2 = off + sizeof(struct icmp6_hdr);
 4736 
 4737                         if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
 4738                             NULL, reason, pd2.af)) {
 4739                                 DPFPRINTF(PF_DEBUG_MISC,
 4740                                     ("pf: ICMP error message too short "
 4741                                     "(ip6)\n"));
 4742                                 return (PF_DROP);
 4743                         }
 4744                         pd2.proto = h2_6.ip6_nxt;
 4745                         pd2.src = (struct pf_addr *)&h2_6.ip6_src;
 4746                         pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
 4747                         pd2.ip_sum = NULL;
 4748                         off2 = ipoff2 + sizeof(h2_6);
 4749                         do {
 4750                                 switch (pd2.proto) {
 4751                                 case IPPROTO_FRAGMENT:
 4752                                         /*
 4753                                          * ICMPv6 error messages for
 4754                                          * non-first fragments
 4755                                          */
 4756                                         REASON_SET(reason, PFRES_FRAG);
 4757                                         return (PF_DROP);
 4758                                 case IPPROTO_AH:
 4759                                 case IPPROTO_HOPOPTS:
 4760                                 case IPPROTO_ROUTING:
 4761                                 case IPPROTO_DSTOPTS: {
 4762                                         /* get next header and header length */
 4763                                         struct ip6_ext opt6;
 4764 
 4765                                         if (!pf_pull_hdr(m, off2, &opt6,
 4766                                             sizeof(opt6), NULL, reason,
 4767                                             pd2.af)) {
 4768                                                 DPFPRINTF(PF_DEBUG_MISC,
 4769                                                     ("pf: ICMPv6 short opt\n"));
 4770                                                 return (PF_DROP);
 4771                                         }
 4772                                         if (pd2.proto == IPPROTO_AH)
 4773                                                 off2 += (opt6.ip6e_len + 2) * 4;
 4774                                         else
 4775                                                 off2 += (opt6.ip6e_len + 1) * 8;
 4776                                         pd2.proto = opt6.ip6e_nxt;
 4777                                         /* goto the next header */
 4778                                         break;
 4779                                 }
 4780                                 default:
 4781                                         terminal++;
 4782                                         break;
 4783                                 }
 4784                         } while (!terminal);
 4785                         break;
 4786 #endif /* INET6 */
 4787                 default:
 4788                         DPFPRINTF(PF_DEBUG_MISC,
 4789                             ("pf: ICMP AF %d unknown (ip6)\n", pd->af));
 4790                         return (PF_DROP);
 4791                         break;
 4792                 }
 4793 
 4794                 switch (pd2.proto) {
 4795                 case IPPROTO_TCP: {
 4796                         struct tcphdr            th;
 4797                         u_int32_t                seq;
 4798                         struct pf_state_peer    *src, *dst;
 4799                         u_int8_t                 dws;
 4800                         int                      copyback = 0;
 4801 
 4802                         /*
 4803                          * Only the first 8 bytes of the TCP header can be
 4804                          * expected. Don't access any TCP header fields after
 4805                          * th_seq, an ackskew test is not possible.
 4806                          */
 4807                         if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
 4808                             pd2.af)) {
 4809                                 DPFPRINTF(PF_DEBUG_MISC,
 4810                                     ("pf: ICMP error message too short "
 4811                                     "(tcp)\n"));
 4812                                 return (PF_DROP);
 4813                         }
 4814 
 4815                         key.af = pd2.af;
 4816                         key.proto = IPPROTO_TCP;
 4817                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
 4818                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
 4819                         key.port[pd2.sidx] = th.th_sport;
 4820                         key.port[pd2.didx] = th.th_dport;
 4821 
 4822                         STATE_LOOKUP(kif, &key, direction, *state, m);
 4823 
 4824                         if (direction == (*state)->direction) {
 4825                                 src = &(*state)->dst;
 4826                                 dst = &(*state)->src;
 4827                         } else {
 4828                                 src = &(*state)->src;
 4829                                 dst = &(*state)->dst;
 4830                         }
 4831 
 4832                         if (src->wscale && dst->wscale)
 4833                                 dws = dst->wscale & PF_WSCALE_MASK;
 4834                         else
 4835                                 dws = 0;
 4836 
 4837                         /* Demodulate sequence number */
 4838                         seq = ntohl(th.th_seq) - src->seqdiff;
 4839                         if (src->seqdiff) {
 4840                                 pf_change_a(&th.th_seq, icmpsum,
 4841                                     htonl(seq), 0);
 4842                                 copyback = 1;
 4843                         }
 4844 
 4845                         if (!((*state)->state_flags & PFSTATE_SLOPPY) &&
 4846                             (!SEQ_GEQ(src->seqhi, seq) ||
 4847                             !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)))) {
 4848                                 if (pf_status.debug >= PF_DEBUG_MISC) {
 4849                                         kprintf("pf: BAD ICMP %d:%d ",
 4850                                             icmptype, pd->hdr.icmp->icmp_code);
 4851                                         pf_print_host(pd->src, 0, pd->af);
 4852                                         kprintf(" -> ");
 4853                                         pf_print_host(pd->dst, 0, pd->af);
 4854                                         kprintf(" state: ");
 4855                                         pf_print_state(*state);
 4856                                         kprintf(" seq=%u\n", seq);
 4857                                 }
 4858                                 REASON_SET(reason, PFRES_BADSTATE);
 4859                                 return (PF_DROP);
 4860                         } else {
 4861                                 if (pf_status.debug >= PF_DEBUG_MISC) {
 4862                                         kprintf("pf: OK ICMP %d:%d ",
 4863                                             icmptype, pd->hdr.icmp->icmp_code);
 4864                                         pf_print_host(pd->src, 0, pd->af);
 4865                                         kprintf(" -> ");
 4866                                         pf_print_host(pd->dst, 0, pd->af);
 4867                                         kprintf(" state: ");
 4868                                         pf_print_state(*state);
 4869                                         kprintf(" seq=%u\n", seq);
 4870                                 }
 4871                         }
 4872 
 4873                         /* translate source/destination address, if necessary */
 4874                         if ((*state)->key[PF_SK_WIRE] !=
 4875                             (*state)->key[PF_SK_STACK]) {
 4876                                 struct pf_state_key *nk =
 4877                                     (*state)->key[pd->didx];
 4878 
 4879                                 if (PF_ANEQ(pd2.src,
 4880                                     &nk->addr[pd2.sidx], pd2.af) ||
 4881                                     nk->port[pd2.sidx] != th.th_sport)
 4882                                         pf_change_icmp(pd2.src, &th.th_sport,
 4883                                             daddr, &nk->addr[pd2.sidx],
 4884                                             nk->port[pd2.sidx], NULL,
 4885                                             pd2.ip_sum, icmpsum,
 4886                                             pd->ip_sum, 0, pd2.af);
 4887 
 4888                                 if (PF_ANEQ(pd2.dst,
 4889                                     &nk->addr[pd2.didx], pd2.af) ||
 4890                                     nk->port[pd2.didx] != th.th_dport)
 4891                                         pf_change_icmp(pd2.dst, &th.th_dport,
 4892                                             NULL, /* XXX Inbound NAT? */
 4893                                             &nk->addr[pd2.didx],
 4894                                             nk->port[pd2.didx], NULL,
 4895                                             pd2.ip_sum, icmpsum,
 4896                                             pd->ip_sum, 0, pd2.af);
 4897                                 copyback = 1;
 4898                         }
 4899 
 4900                         if (copyback) {
 4901                                 switch (pd2.af) {
 4902 #ifdef INET
 4903                                 case AF_INET:
 4904                                         m_copyback(m, off, ICMP_MINLEN,
 4905                                             (caddr_t)pd->hdr.icmp);
 4906                                         m_copyback(m, ipoff2, sizeof(h2),
 4907                                             (caddr_t)&h2);
 4908                                         break;
 4909 #endif /* INET */
 4910 #ifdef INET6
 4911                                 case AF_INET6:
 4912                                         m_copyback(m, off,
 4913                                             sizeof(struct icmp6_hdr),
 4914                                             (caddr_t)pd->hdr.icmp6);
 4915                                         m_copyback(m, ipoff2, sizeof(h2_6),
 4916                                             (caddr_t)&h2_6);
 4917                                         break;
 4918 #endif /* INET6 */
 4919                                 }
 4920                                 m_copyback(m, off2, 8, (caddr_t)&th);
 4921                         }
 4922 
 4923                         return (PF_PASS);
 4924                         break;
 4925                 }
 4926                 case IPPROTO_UDP: {
 4927                         struct udphdr           uh;
 4928 
 4929                         if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
 4930                             NULL, reason, pd2.af)) {
 4931                                 DPFPRINTF(PF_DEBUG_MISC,
 4932                                     ("pf: ICMP error message too short "
 4933                                     "(udp)\n"));
 4934                                 return (PF_DROP);
 4935                         }
 4936 
 4937                         key.af = pd2.af;
 4938                         key.proto = IPPROTO_UDP;
 4939                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
 4940                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
 4941                         key.port[pd2.sidx] = uh.uh_sport;
 4942                         key.port[pd2.didx] = uh.uh_dport;
 4943 
 4944                         STATE_LOOKUP(kif, &key, direction, *state, m);
 4945 
 4946                         /* translate source/destination address, if necessary */
 4947                         if ((*state)->key[PF_SK_WIRE] !=
 4948                             (*state)->key[PF_SK_STACK]) {
 4949                                 struct pf_state_key *nk =
 4950                                     (*state)->key[pd->didx];
 4951 
 4952                                 if (PF_ANEQ(pd2.src,
 4953                                     &nk->addr[pd2.sidx], pd2.af) ||
 4954                                     nk->port[pd2.sidx] != uh.uh_sport)
 4955                                         pf_change_icmp(pd2.src, &uh.uh_sport,
 4956                                             daddr, &nk->addr[pd2.sidx],
 4957                                             nk->port[pd2.sidx], &uh.uh_sum,
 4958                                             pd2.ip_sum, icmpsum,
 4959                                             pd->ip_sum, 1, pd2.af);
 4960 
 4961                                 if (PF_ANEQ(pd2.dst,
 4962                                     &nk->addr[pd2.didx], pd2.af) ||
 4963                                     nk->port[pd2.didx] != uh.uh_dport)
 4964                                         pf_change_icmp(pd2.dst, &uh.uh_dport,
 4965                                             NULL, /* XXX Inbound NAT? */
 4966                                             &nk->addr[pd2.didx],
 4967                                             nk->port[pd2.didx], &uh.uh_sum,
 4968                                             pd2.ip_sum, icmpsum,
 4969                                             pd->ip_sum, 1, pd2.af);
 4970 
 4971                                 switch (pd2.af) {
 4972 #ifdef INET
 4973                                 case AF_INET:
 4974                                         m_copyback(m, off, ICMP_MINLEN,
 4975                                             (caddr_t)pd->hdr.icmp);
 4976                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
 4977                                         break;
 4978 #endif /* INET */
 4979 #ifdef INET6
 4980                                 case AF_INET6:
 4981                                         m_copyback(m, off,
 4982                                             sizeof(struct icmp6_hdr),
 4983                                             (caddr_t)pd->hdr.icmp6);
 4984                                         m_copyback(m, ipoff2, sizeof(h2_6),
 4985                                             (caddr_t)&h2_6);
 4986                                         break;
 4987 #endif /* INET6 */
 4988                                 }
 4989                                 m_copyback(m, off2, sizeof(uh), (caddr_t)&uh);
 4990                         }
 4991 
 4992                         return (PF_PASS);
 4993                         break;
 4994                 }
 4995 #ifdef INET
 4996                 case IPPROTO_ICMP: {
 4997                         struct icmp             iih;
 4998 
 4999                         if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
 5000                             NULL, reason, pd2.af)) {
 5001                                 DPFPRINTF(PF_DEBUG_MISC,
 5002                                     ("pf: ICMP error message too short i"
 5003                                     "(icmp)\n"));
 5004                                 return (PF_DROP);
 5005                         }
 5006 
 5007                         key.af = pd2.af;
 5008                         key.proto = IPPROTO_ICMP;
 5009                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
 5010                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
 5011                         key.port[0] = key.port[1] = iih.icmp_id;
 5012 
 5013                         STATE_LOOKUP(kif, &key, direction, *state, m);
 5014 
 5015                         /* translate source/destination address, if necessary */
 5016                         if ((*state)->key[PF_SK_WIRE] !=
 5017                             (*state)->key[PF_SK_STACK]) {
 5018                                 struct pf_state_key *nk =
 5019                                     (*state)->key[pd->didx];
 5020 
 5021                                 if (PF_ANEQ(pd2.src,
 5022                                     &nk->addr[pd2.sidx], pd2.af) ||
 5023                                     nk->port[pd2.sidx] != iih.icmp_id)
 5024                                         pf_change_icmp(pd2.src, &iih.icmp_id,
 5025                                             daddr, &nk->addr[pd2.sidx],
 5026                                             nk->port[pd2.sidx], NULL,
 5027                                             pd2.ip_sum, icmpsum,
 5028                                             pd->ip_sum, 0, AF_INET);
 5029 
 5030                                 if (PF_ANEQ(pd2.dst,
 5031                                     &nk->addr[pd2.didx], pd2.af) ||
 5032                                     nk->port[pd2.didx] != iih.icmp_id)
 5033                                         pf_change_icmp(pd2.dst, &iih.icmp_id,
 5034                                             NULL, /* XXX Inbound NAT? */
 5035                                             &nk->addr[pd2.didx],
 5036                                             nk->port[pd2.didx], NULL,
 5037                                             pd2.ip_sum, icmpsum,
 5038                                             pd->ip_sum, 0, AF_INET);
 5039 
 5040                                 m_copyback(m, off, ICMP_MINLEN, (caddr_t)pd->hdr.icmp);
 5041                                 m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
 5042                                 m_copyback(m, off2, ICMP_MINLEN, (caddr_t)&iih);
 5043                         }
 5044                         return (PF_PASS);
 5045                         break;
 5046                 }
 5047 #endif /* INET */
 5048 #ifdef INET6
 5049                 case IPPROTO_ICMPV6: {
 5050                         struct icmp6_hdr        iih;
 5051 
 5052                         if (!pf_pull_hdr(m, off2, &iih,
 5053                             sizeof(struct icmp6_hdr), NULL, reason, pd2.af)) {
 5054                                 DPFPRINTF(PF_DEBUG_MISC,
 5055                                     ("pf: ICMP error message too short "
 5056                                     "(icmp6)\n"));
 5057                                 return (PF_DROP);
 5058                         }
 5059 
 5060                         key.af = pd2.af;
 5061                         key.proto = IPPROTO_ICMPV6;
 5062                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
 5063                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
 5064                         key.port[0] = key.port[1] = iih.icmp6_id;
 5065 
 5066                         STATE_LOOKUP(kif, &key, direction, *state, m);
 5067 
 5068                         /* translate source/destination address, if necessary */
 5069                         if ((*state)->key[PF_SK_WIRE] !=
 5070                             (*state)->key[PF_SK_STACK]) {
 5071                                 struct pf_state_key *nk =
 5072                                     (*state)->key[pd->didx];
 5073 
 5074                                 if (PF_ANEQ(pd2.src,
 5075                                     &nk->addr[pd2.sidx], pd2.af) ||
 5076                                     nk->port[pd2.sidx] != iih.icmp6_id)
 5077                                         pf_change_icmp(pd2.src, &iih.icmp6_id,
 5078                                             daddr, &nk->addr[pd2.sidx],
 5079                                             nk->port[pd2.sidx], NULL,
 5080                                             pd2.ip_sum, icmpsum,
 5081                                             pd->ip_sum, 0, AF_INET6);
 5082 
 5083                                 if (PF_ANEQ(pd2.dst,
 5084                                     &nk->addr[pd2.didx], pd2.af) ||
 5085                                     nk->port[pd2.didx] != iih.icmp6_id)
 5086                                         pf_change_icmp(pd2.dst, &iih.icmp6_id,
 5087                                             NULL, /* XXX Inbound NAT? */
 5088                                             &nk->addr[pd2.didx],
 5089                                             nk->port[pd2.didx], NULL,
 5090                                             pd2.ip_sum, icmpsum,
 5091                                             pd->ip_sum, 0, AF_INET6);
 5092 
 5093                                 m_copyback(m, off, sizeof(struct icmp6_hdr),
 5094                                     (caddr_t)pd->hdr.icmp6);
 5095                                 m_copyback(m, ipoff2, sizeof(h2_6), (caddr_t)&h2_6);
 5096                                 m_copyback(m, off2, sizeof(struct icmp6_hdr),
 5097                                     (caddr_t)&iih);
 5098                         }
 5099 
 5100                         return (PF_PASS);
 5101                         break;
 5102                 }
 5103 #endif /* INET6 */
 5104                 default: {
 5105                         key.af = pd2.af;
 5106                         key.proto = pd2.proto;
 5107                         PF_ACPY(&key.addr[pd2.sidx], pd2.src, key.af);
 5108                         PF_ACPY(&key.addr[pd2.didx], pd2.dst, key.af);
 5109                         key.port[0] = key.port[1] = 0;
 5110 
 5111                         STATE_LOOKUP(kif, &key, direction, *state, m);
 5112 
 5113                         /* translate source/destination address, if necessary */
 5114                         if ((*state)->key[PF_SK_WIRE] !=
 5115                             (*state)->key[PF_SK_STACK]) {
 5116                                 struct pf_state_key *nk =
 5117                                     (*state)->key[pd->didx];
 5118 
 5119                                 if (PF_ANEQ(pd2.src,
 5120                                     &nk->addr[pd2.sidx], pd2.af))
 5121                                         pf_change_icmp(pd2.src, NULL, daddr,
 5122                                             &nk->addr[pd2.sidx], 0, NULL,
 5123                                             pd2.ip_sum, icmpsum,
 5124                                             pd->ip_sum, 0, pd2.af);
 5125 
 5126                                 if (PF_ANEQ(pd2.dst,
 5127                                     &nk->addr[pd2.didx], pd2.af))
 5128                                         pf_change_icmp(pd2.src, NULL,
 5129                                             NULL, /* XXX Inbound NAT? */
 5130                                             &nk->addr[pd2.didx], 0, NULL,
 5131                                             pd2.ip_sum, icmpsum,
 5132                                             pd->ip_sum, 0, pd2.af);
 5133 
 5134                                 switch (pd2.af) {
 5135 #ifdef INET
 5136                                 case AF_INET:
 5137                                         m_copyback(m, off, ICMP_MINLEN,
 5138                                             (caddr_t)pd->hdr.icmp);
 5139                                         m_copyback(m, ipoff2, sizeof(h2), (caddr_t)&h2);
 5140                                         break;
 5141 #endif /* INET */
 5142 #ifdef INET6
 5143                                 case AF_INET6:
 5144                                         m_copyback(m, off,
 5145                                             sizeof(struct icmp6_hdr),
 5146                                             (caddr_t)pd->hdr.icmp6);
 5147                                         m_copyback(m, ipoff2, sizeof(h2_6),
 5148                                             (caddr_t)&h2_6);
 5149                                         break;
 5150 #endif /* INET6 */
 5151                                 }
 5152                         }
 5153                         return (PF_PASS);
 5154                         break;
 5155                 }
 5156                 }
 5157         }
 5158 }
 5159 
 5160 int
 5161 pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
 5162     struct mbuf *m, struct pf_pdesc *pd)
 5163 {
 5164         struct pf_state_peer    *src, *dst;
 5165         struct pf_state_key_cmp  key;
 5166 
 5167         key.af = pd->af;
 5168         key.proto = pd->proto;
 5169         if (direction == PF_IN) {
 5170                 PF_ACPY(&key.addr[0], pd->src, key.af);
 5171                 PF_ACPY(&key.addr[1], pd->dst, key.af);
 5172                 key.port[0] = key.port[1] = 0;
 5173         } else {
 5174                 PF_ACPY(&key.addr[1], pd->src, key.af);
 5175                 PF_ACPY(&key.addr[0], pd->dst, key.af);
 5176                 key.port[1] = key.port[0] = 0;
 5177         }
 5178 
 5179         STATE_LOOKUP(kif, &key, direction, *state, m);
 5180 
 5181         if (direction == (*state)->direction) {
 5182                 src = &(*state)->src;
 5183                 dst = &(*state)->dst;
 5184         } else {
 5185                 src = &(*state)->dst;
 5186                 dst = &(*state)->src;
 5187         }
 5188 
 5189         /* update states */
 5190         if (src->state < PFOTHERS_SINGLE)
 5191                 src->state = PFOTHERS_SINGLE;
 5192         if (dst->state == PFOTHERS_SINGLE)
 5193                 dst->state = PFOTHERS_MULTIPLE;
 5194 
 5195         /* update expire time */
 5196         (*state)->expire = time_second;
 5197         if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
 5198                 (*state)->timeout = PFTM_OTHER_MULTIPLE;
 5199         else
 5200                 (*state)->timeout = PFTM_OTHER_SINGLE;
 5201 
 5202         /* translate source/destination address, if necessary */
 5203         if ((*state)->key[PF_SK_WIRE] != (*state)->key[PF_SK_STACK]) {
 5204                 struct pf_state_key *nk = (*state)->key[pd->didx];
 5205 
 5206                 KKASSERT(nk);
 5207                 KKASSERT(pd);
 5208                 KKASSERT(pd->src);
 5209                 KKASSERT(pd->dst);
 5210                 switch (pd->af) {
 5211 #ifdef INET
 5212                 case AF_INET:
 5213                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
 5214                                 pf_change_a(&pd->src->v4.s_addr,
 5215                                     pd->ip_sum,
 5216                                     nk->addr[pd->sidx].v4.s_addr,
 5217                                     0);
 5218 
 5219 
 5220                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
 5221                                 pf_change_a(&pd->dst->v4.s_addr,
 5222                                     pd->ip_sum,
 5223                                     nk->addr[pd->didx].v4.s_addr,
 5224                                     0);
 5225 
 5226                         break;
 5227 #endif /* INET */
 5228 #ifdef INET6
 5229                 case AF_INET6:
 5230                         if (PF_ANEQ(pd->src, &nk->addr[pd->sidx], AF_INET))
 5231                                 PF_ACPY(pd->src, &nk->addr[pd->sidx], pd->af);
 5232 
 5233                         if (PF_ANEQ(pd->dst, &nk->addr[pd->didx], AF_INET))
 5234                                 PF_ACPY(pd->dst, &nk->addr[pd->didx], pd->af);
 5235 #endif /* INET6 */
 5236                 }
 5237         }
 5238         return (PF_PASS);
 5239 }
 5240 
 5241 /*
 5242  * ipoff and off are measured from the start of the mbuf chain.
 5243  * h must be at "ipoff" on the mbuf chain.
 5244  */
 5245 void *
 5246 pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
 5247     u_short *actionp, u_short *reasonp, sa_family_t af)
 5248 {
 5249         switch (af) {
 5250 #ifdef INET
 5251         case AF_INET: {
 5252                 struct ip       *h = mtod(m, struct ip *);
 5253                 u_int16_t        fragoff = (h->ip_off & IP_OFFMASK) << 3;
 5254 
 5255                 if (fragoff) {
 5256                         if (fragoff >= len)
 5257                                 ACTION_SET(actionp, PF_PASS);
 5258                         else {
 5259                                 ACTION_SET(actionp, PF_DROP);
 5260                                 REASON_SET(reasonp, PFRES_FRAG);
 5261                         }
 5262                         return (NULL);
 5263                 }
 5264                 if (m->m_pkthdr.len < off + len ||
 5265                     h->ip_len < off + len) {
 5266                         ACTION_SET(actionp, PF_DROP);
 5267                         REASON_SET(reasonp, PFRES_SHORT);
 5268                         return (NULL);
 5269                 }
 5270                 break;
 5271         }
 5272 #endif /* INET */
 5273 #ifdef INET6
 5274         case AF_INET6: {
 5275                 struct ip6_hdr  *h = mtod(m, struct ip6_hdr *);
 5276 
 5277                 if (m->m_pkthdr.len < off + len ||
 5278                     (ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
 5279                     (unsigned)(off + len)) {
 5280                         ACTION_SET(actionp, PF_DROP);
 5281                         REASON_SET(reasonp, PFRES_SHORT);
 5282                         return (NULL);
 5283                 }
 5284                 break;
 5285         }
 5286 #endif /* INET6 */
 5287         }
 5288         m_copydata(m, off, len, p);
 5289         return (p);
 5290 }
 5291 
 5292 int
 5293 pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
 5294 {
 5295         struct sockaddr_in      *dst;
 5296         int                      ret = 1;
 5297         int                      check_mpath;
 5298 #ifdef INET6
 5299         struct sockaddr_in6     *dst6;
 5300         struct route_in6         ro;
 5301 #else
 5302         struct route             ro;
 5303 #endif
 5304         struct radix_node       *rn;
 5305         struct rtentry          *rt;
 5306         struct ifnet            *ifp;
 5307 
 5308         check_mpath = 0;
 5309         bzero(&ro, sizeof(ro));
 5310         switch (af) {
 5311         case AF_INET:
 5312                 dst = satosin(&ro.ro_dst);
 5313                 dst->sin_family = AF_INET;
 5314                 dst->sin_len = sizeof(*dst);
 5315                 dst->sin_addr = addr->v4;
 5316                 break;
 5317 #ifdef INET6
 5318         case AF_INET6:
 5319                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 5320                 dst6->sin6_family = AF_INET6;
 5321                 dst6->sin6_len = sizeof(*dst6);
 5322                 dst6->sin6_addr = addr->v6;
 5323                 break;
 5324 #endif /* INET6 */
 5325         default:
 5326                 return (0);
 5327         }
 5328 
 5329         /* Skip checks for ipsec interfaces */
 5330         if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
 5331                 goto out;
 5332 
 5333         rtalloc_ign((struct route *)&ro, 0);
 5334 
 5335         if (ro.ro_rt != NULL) {
 5336                 /* No interface given, this is a no-route check */
 5337                 if (kif == NULL)
 5338                         goto out;
 5339 
 5340                 if (kif->pfik_ifp == NULL) {
 5341                         ret = 0;
 5342                         goto out;
 5343                 }
 5344 
 5345                 /* Perform uRPF check if passed input interface */
 5346                 ret = 0;
 5347                 rn = (struct radix_node *)ro.ro_rt;
 5348                 do {
 5349                         rt = (struct rtentry *)rn;
 5350                         ifp = rt->rt_ifp;
 5351 
 5352                         if (kif->pfik_ifp == ifp)
 5353                                 ret = 1;
 5354                         rn = NULL;
 5355                 } while (check_mpath == 1 && rn != NULL && ret == 0);
 5356         } else
 5357                 ret = 0;
 5358 out:
 5359         if (ro.ro_rt != NULL)
 5360                 RTFREE(ro.ro_rt);
 5361         return (ret);
 5362 }
 5363 
 5364 int
 5365 pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
 5366 {
 5367         struct sockaddr_in      *dst;
 5368 #ifdef INET6
 5369         struct sockaddr_in6     *dst6;
 5370         struct route_in6         ro;
 5371 #else
 5372         struct route             ro;
 5373 #endif
 5374         int                      ret = 0;
 5375 
 5376         ASSERT_LWKT_TOKEN_HELD(&pf_token);
 5377 
 5378         bzero(&ro, sizeof(ro));
 5379         switch (af) {
 5380         case AF_INET:
 5381                 dst = satosin(&ro.ro_dst);
 5382                 dst->sin_family = AF_INET;
 5383                 dst->sin_len = sizeof(*dst);
 5384                 dst->sin_addr = addr->v4;
 5385                 break;
 5386 #ifdef INET6
 5387         case AF_INET6:
 5388                 dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
 5389                 dst6->sin6_family = AF_INET6;
 5390                 dst6->sin6_len = sizeof(*dst6);
 5391                 dst6->sin6_addr = addr->v6;
 5392                 break;
 5393 #endif /* INET6 */
 5394         default:
 5395                 return (0);
 5396         }
 5397 
 5398 rtalloc_ign((struct route *)&ro, (RTF_CLONING | RTF_PRCLONING));
 5399 
 5400         if (ro.ro_rt != NULL) {
 5401                 RTFREE(ro.ro_rt);
 5402         }
 5403 
 5404         return (ret);
 5405 }
 5406 
 5407 #ifdef INET
 5408 void
 5409 pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
 5410     struct pf_state *s, struct pf_pdesc *pd)
 5411 {
 5412         struct mbuf             *m0, *m1;
 5413         struct route             iproute;
 5414         struct route            *ro = NULL;
 5415         struct sockaddr_in      *dst;
 5416         struct ip               *ip;
 5417         struct ifnet            *ifp = NULL;
 5418         struct pf_addr           naddr;
 5419         struct pf_src_node      *sn = NULL;
 5420         int                      error = 0;
 5421         int sw_csum;
 5422 #ifdef IPSEC
 5423         struct m_tag            *mtag;
 5424 #endif /* IPSEC */
 5425 
 5426         ASSERT_LWKT_TOKEN_HELD(&pf_token);
 5427 
 5428         if (m == NULL || *m == NULL || r == NULL ||
 5429             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
 5430                 panic("pf_route: invalid parameters");
 5431 
 5432         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
 5433                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
 5434                 (*m)->m_pkthdr.pf.routed = 1;
 5435         } else {
 5436                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
 5437                         m0 = *m;
 5438                         *m = NULL;
 5439                         goto bad;
 5440                 }
 5441         }
 5442 
 5443         if (r->rt == PF_DUPTO) {
 5444                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL) {
 5445                         return;
 5446                 }
 5447         } else {
 5448                 if ((r->rt == PF_REPLYTO) == (r->direction == dir)) {
 5449                         return;
 5450                 }
 5451                 m0 = *m;
 5452         }
 5453 
 5454         if (m0->m_len < sizeof(struct ip)) {
 5455                 DPFPRINTF(PF_DEBUG_URGENT,
 5456                     ("pf_route: m0->m_len < sizeof(struct ip)\n"));
 5457                 goto bad;
 5458         }
 5459 
 5460         ip = mtod(m0, struct ip *);
 5461 
 5462         ro = &iproute;
 5463         bzero((caddr_t)ro, sizeof(*ro));
 5464         dst = satosin(&ro->ro_dst);
 5465         dst->sin_family = AF_INET;
 5466         dst->sin_len = sizeof(*dst);
 5467         dst->sin_addr = ip->ip_dst;
 5468 
 5469         if (r->rt == PF_FASTROUTE) {
 5470                 rtalloc(ro);
 5471                 if (ro->ro_rt == 0) {
 5472                         ipstat.ips_noroute++;
 5473                         goto bad;
 5474                 }
 5475 
 5476                 ifp = ro->ro_rt->rt_ifp;
 5477                 ro->ro_rt->rt_use++;
 5478 
 5479                 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
 5480                         dst = satosin(ro->ro_rt->rt_gateway);
 5481         } else {
 5482                 if (TAILQ_EMPTY(&r->rpool.list)) {
 5483                         DPFPRINTF(PF_DEBUG_URGENT,
 5484                             ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
 5485                         goto bad;
 5486                 }
 5487                 if (s == NULL) {
 5488                         pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
 5489                             &naddr, NULL, &sn);
 5490                         if (!PF_AZERO(&naddr, AF_INET))
 5491                                 dst->sin_addr.s_addr = naddr.v4.s_addr;
 5492                         ifp = r->rpool.cur->kif ?
 5493                             r->rpool.cur->kif->pfik_ifp : NULL;
 5494                 } else {
 5495                         if (!PF_AZERO(&s->rt_addr, AF_INET))
 5496                                 dst->sin_addr.s_addr =
 5497                                     s->rt_addr.v4.s_addr;
 5498                         ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
 5499                 }
 5500         }
 5501         if (ifp == NULL)
 5502                 goto bad;
 5503 
 5504         if (oifp != ifp) {
 5505                 if (pf_test(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
 5506                         goto bad;
 5507                 } else if (m0 == NULL) {
 5508                         goto done;
 5509                 }
 5510                 if (m0->m_len < sizeof(struct ip)) {
 5511                         DPFPRINTF(PF_DEBUG_URGENT,
 5512                             ("pf_route: m0->m_len < sizeof(struct ip)\n"));
 5513                         goto bad;
 5514                 }
 5515                 ip = mtod(m0, struct ip *);
 5516         }
 5517 
 5518         /* Copied from FreeBSD 5.1-CURRENT ip_output. */
 5519         m0->m_pkthdr.csum_flags |= CSUM_IP;
 5520         sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
 5521         if (sw_csum & CSUM_DELAY_DATA) {
 5522                 in_delayed_cksum(m0);
 5523                 sw_csum &= ~CSUM_DELAY_DATA;
 5524         }
 5525         m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
 5526         m0->m_pkthdr.csum_iphlen = (ip->ip_hl << 2);
 5527 
 5528         if (ip->ip_len <= ifp->if_mtu ||
 5529             (ifp->if_hwassist & CSUM_FRAGMENT &&
 5530                 (ip->ip_off & IP_DF) == 0)) {
 5531                 ip->ip_len = htons(ip->ip_len);
 5532                 ip->ip_off = htons(ip->ip_off);
 5533                 ip->ip_sum = 0;
 5534                 if (sw_csum & CSUM_DELAY_IP) {
 5535                         /* From KAME */
 5536                         if (ip->ip_v == IPVERSION &&
 5537                             (ip->ip_hl << 2) == sizeof(*ip)) {
 5538                                 ip->ip_sum = in_cksum_hdr(ip);
 5539                         } else {
 5540                                 ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
 5541                         }
 5542                 }
 5543                 lwkt_reltoken(&pf_token);
 5544                 error = ifp->if_output(ifp, m0, sintosa(dst), ro->ro_rt);
 5545                 lwkt_gettoken(&pf_token);
 5546                 goto done;
 5547         }
 5548 
 5549         /*
 5550          * Too large for interface; fragment if possible.
 5551          * Must be able to put at least 8 bytes per fragment.
 5552          */
 5553         if (ip->ip_off & IP_DF) {
 5554                 ipstat.ips_cantfrag++;
 5555                 if (r->rt != PF_DUPTO) {
 5556                         icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
 5557                             ifp->if_mtu);
 5558                         goto done;
 5559                 } else
 5560                         goto bad;
 5561         }
 5562 
 5563         m1 = m0;
 5564         error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
 5565         if (error) {
 5566                 goto bad;
 5567         }
 5568 
 5569         for (m0 = m1; m0; m0 = m1) {
 5570                 m1 = m0->m_nextpkt;
 5571                 m0->m_nextpkt = 0;
 5572                 if (error == 0) {
 5573                         lwkt_reltoken(&pf_token);
 5574                         error = (*ifp->if_output)(ifp, m0, sintosa(dst),
 5575                                                   NULL);
 5576                         lwkt_gettoken(&pf_token);
 5577                 } else
 5578                         m_freem(m0);
 5579         }
 5580 
 5581         if (error == 0)
 5582                 ipstat.ips_fragmented++;
 5583 
 5584 done:
 5585         if (r->rt != PF_DUPTO)
 5586                 *m = NULL;
 5587         if (ro == &iproute && ro->ro_rt)
 5588                 RTFREE(ro->ro_rt);
 5589         return;
 5590 
 5591 bad:
 5592         m_freem(m0);
 5593         goto done;
 5594 }
 5595 #endif /* INET */
 5596 
 5597 #ifdef INET6
 5598 void
 5599 pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
 5600     struct pf_state *s, struct pf_pdesc *pd)
 5601 {
 5602         struct mbuf             *m0;
 5603         struct route_in6         ip6route;
 5604         struct route_in6        *ro;
 5605         struct sockaddr_in6     *dst;
 5606         struct ip6_hdr          *ip6;
 5607         struct ifnet            *ifp = NULL;
 5608         struct pf_addr           naddr;
 5609         struct pf_src_node      *sn = NULL;
 5610 
 5611         if (m == NULL || *m == NULL || r == NULL ||
 5612             (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
 5613                 panic("pf_route6: invalid parameters");
 5614 
 5615         if (((*m)->m_pkthdr.fw_flags & PF_MBUF_ROUTED) == 0) {
 5616                 (*m)->m_pkthdr.fw_flags |= PF_MBUF_ROUTED;
 5617                 (*m)->m_pkthdr.pf.routed = 1;
 5618         } else {
 5619                 if ((*m)->m_pkthdr.pf.routed++ > 3) {
 5620                         m0 = *m;
 5621                         *m = NULL;
 5622                         goto bad;
 5623                 }
 5624         }
 5625 
 5626         if (r->rt == PF_DUPTO) {
 5627                 if ((m0 = m_dup(*m, MB_DONTWAIT)) == NULL)
 5628                         return;
 5629         } else {
 5630                 if ((r->rt == PF_REPLYTO) == (r->direction == dir))
 5631                         return;
 5632                 m0 = *m;
 5633         }
 5634 
 5635         if (m0->m_len < sizeof(struct ip6_hdr)) {
 5636                 DPFPRINTF(PF_DEBUG_URGENT,
 5637                     ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
 5638                 goto bad;
 5639         }
 5640         ip6 = mtod(m0, struct ip6_hdr *);
 5641 
 5642         ro = &ip6route;
 5643         bzero((caddr_t)ro, sizeof(*ro));
 5644         dst = (struct sockaddr_in6 *)&ro->ro_dst;
 5645         dst->sin6_family = AF_INET6;
 5646         dst->sin6_len = sizeof(*dst);
 5647         dst->sin6_addr = ip6->ip6_dst;
 5648 
 5649         /*
 5650          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
 5651          * so make sure pf.flags is clear.
 5652          *
 5653          * Cheat. XXX why only in the v6 case???
 5654          */
 5655         if (r->rt == PF_FASTROUTE) {
 5656                 m0->m_pkthdr.fw_flags |= PF_MBUF_TAGGED;
 5657                 m0->m_pkthdr.pf.flags = 0;
 5658                 /* XXX Re-Check when Upgrading to > 4.4 */
 5659                 m0->m_pkthdr.pf.statekey = NULL;
 5660                 ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
 5661                 return;
 5662         }
 5663 
 5664         if (TAILQ_EMPTY(&r->rpool.list)) {
 5665                 DPFPRINTF(PF_DEBUG_URGENT,
 5666                     ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
 5667                 goto bad;
 5668         }
 5669         if (s == NULL) {
 5670                 pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
 5671                     &naddr, NULL, &sn);
 5672                 if (!PF_AZERO(&naddr, AF_INET6))
 5673                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
 5674                             &naddr, AF_INET6);
 5675                 ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
 5676         } else {
 5677                 if (!PF_AZERO(&s->rt_addr, AF_INET6))
 5678                         PF_ACPY((struct pf_addr *)&dst->sin6_addr,
 5679                             &s->rt_addr, AF_INET6);
 5680                 ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
 5681         }
 5682         if (ifp == NULL)
 5683                 goto bad;
 5684 
 5685         if (oifp != ifp) {
 5686                 if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
 5687                         goto bad;
 5688                 } else if (m0 == NULL) {
 5689                         goto done;
 5690                 }
 5691                 if (m0->m_len < sizeof(struct ip6_hdr)) {
 5692                         DPFPRINTF(PF_DEBUG_URGENT,
 5693                             ("pf_route6: m0->m_len < sizeof(struct ip6_hdr)\n"));
 5694                         goto bad;
 5695                 }
 5696                 ip6 = mtod(m0, struct ip6_hdr *);
 5697         }
 5698 
 5699         /*
 5700          * If the packet is too large for the outgoing interface,
 5701          * send back an icmp6 error.
 5702          */
 5703         if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
 5704                 dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
 5705         if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
 5706                 nd6_output(ifp, ifp, m0, dst, NULL);
 5707         } else {
 5708                 in6_ifstat_inc(ifp, ifs6_in_toobig);
 5709                 if (r->rt != PF_DUPTO)
 5710                         icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
 5711                 else
 5712                         goto bad;
 5713         }
 5714 
 5715 done:
 5716         if (r->rt != PF_DUPTO)
 5717                 *m = NULL;
 5718         return;
 5719 
 5720 bad:
 5721         m_freem(m0);
 5722         goto done;
 5723 }
 5724 #endif /* INET6 */
 5725 
 5726 
 5727 /*
 5728  * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
 5729  *   off is the offset where the protocol header starts
 5730  *   len is the total length of protocol header plus payload
 5731  * returns 0 when the checksum is valid, otherwise returns 1.
 5732  */
 5733 /*
 5734  * XXX
 5735  * FreeBSD supports cksum offload for the following drivers.
 5736  * em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
 5737  * If we can make full use of it we would outperform ipfw/ipfilter in
 5738  * very heavy traffic. 
 5739  * I have not tested 'cause I don't have NICs that supports cksum offload.
 5740  * (There might be problems. Typical phenomena would be
 5741  *   1. No route message for UDP packet.
 5742  *   2. No connection acceptance from external hosts regardless of rule set.)
 5743  */
 5744 int
 5745 pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
 5746     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         case IPPROTO_UDP:
 5760                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
 5761                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
 5762                                 sum = m->m_pkthdr.csum_data;
 5763                         } else {
 5764                                 ip = mtod(m, struct ip *);      
 5765                                 sum = in_pseudo(ip->ip_src.s_addr,
 5766                                         ip->ip_dst.s_addr, htonl((u_short)len +
 5767                                         m->m_pkthdr.csum_data + p));
 5768                         }
 5769                         sum ^= 0xffff;
 5770                         ++hw_assist;
 5771                 }
 5772                 break;
 5773         case IPPROTO_ICMP:
 5774 #ifdef INET6
 5775         case IPPROTO_ICMPV6:
 5776 #endif /* INET6 */
 5777                 break;
 5778         default:
 5779                 return (1);
 5780         }
 5781 
 5782         if (!hw_assist) {
 5783                 switch (af) {
 5784                 case AF_INET:
 5785                         if (p == IPPROTO_ICMP) {
 5786                                 if (m->m_len < off)
 5787                                         return (1);
 5788                                 m->m_data += off;
 5789                                 m->m_len -= off;
 5790                                 sum = in_cksum(m, len);
 5791                                 m->m_data -= off;
 5792                                 m->m_len += off;
 5793                         } else {
 5794                                 if (m->m_len < sizeof(struct ip))
 5795                                         return (1);
 5796                                 sum = in_cksum_range(m, p, off, len);
 5797                                 if (sum == 0) {
 5798                                         m->m_pkthdr.csum_flags |=
 5799                                             (CSUM_DATA_VALID |
 5800                                              CSUM_PSEUDO_HDR);
 5801                                         m->m_pkthdr.csum_data = 0xffff;
 5802                                 }
 5803                         }
 5804                         break;
 5805 #ifdef INET6
 5806                 case AF_INET6:
 5807                         if (m->m_len < sizeof(struct ip6_hdr))
 5808                                 return (1);
 5809                         sum = in6_cksum(m, p, off, len);
 5810                         /*
 5811                          * XXX
 5812                          * IPv6 H/W cksum off-load not supported yet!
 5813                          *
 5814                          * if (sum == 0) {
 5815                          *      m->m_pkthdr.csum_flags |=
 5816                          *          (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
 5817                          *      m->m_pkthdr.csum_data = 0xffff;
 5818                          *}
 5819                          */
 5820                         break;
 5821 #endif /* INET6 */
 5822                 default:
 5823                         return (1);
 5824                 }
 5825         }
 5826         if (sum) {
 5827                 switch (p) {
 5828                 case IPPROTO_TCP:
 5829                         tcpstat.tcps_rcvbadsum++;
 5830                         break;
 5831                 case IPPROTO_UDP:
 5832                         udp_stat.udps_badsum++;
 5833                         break;
 5834                 case IPPROTO_ICMP:
 5835                         icmpstat.icps_checksum++;
 5836                         break;
 5837 #ifdef INET6
 5838                 case IPPROTO_ICMPV6:
 5839                         icmp6stat.icp6s_checksum++;
 5840                         break;
 5841 #endif /* INET6 */
 5842                 }
 5843                 return (1);
 5844         }
 5845         return (0);
 5846 }
 5847 
 5848 struct pf_divert *
 5849 pf_find_divert(struct mbuf *m)
 5850 {
 5851         struct m_tag    *mtag;
 5852 
 5853         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL)
 5854                 return (NULL);
 5855 
 5856         return ((struct pf_divert *)(mtag + 1));
 5857 }
 5858 
 5859 struct pf_divert *
 5860 pf_get_divert(struct mbuf *m)
 5861 {
 5862         struct m_tag    *mtag;
 5863 
 5864         if ((mtag = m_tag_find(m, PACKET_TAG_PF_DIVERT, NULL)) == NULL) {
 5865                 mtag = m_tag_get(PACKET_TAG_PF_DIVERT, sizeof(struct pf_divert),
 5866                     M_NOWAIT);
 5867                 if (mtag == NULL)
 5868                         return (NULL);
 5869                 bzero(mtag + 1, sizeof(struct pf_divert));
 5870                 m_tag_prepend(m, mtag);
 5871         }
 5872 
 5873         return ((struct pf_divert *)(mtag + 1));
 5874 }
 5875 
 5876 #ifdef INET
 5877 int
 5878 pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
 5879     struct ether_header *eh, struct inpcb *inp)
 5880 {
 5881         struct pfi_kif          *kif;
 5882         u_short                  action, reason = 0, log = 0;
 5883         struct mbuf             *m = *m0;
 5884         struct ip               *h = NULL;
 5885         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
 5886         struct pf_state         *s = NULL;
 5887         struct pf_ruleset       *ruleset = NULL;
 5888         struct pf_pdesc          pd;
 5889         int                      off, dirndx;
 5890 #ifdef ALTQ
 5891         int                      pqid = 0;
 5892 #endif
 5893 
 5894         if (!pf_status.running)
 5895                 return (PF_PASS);
 5896 
 5897         memset(&pd, 0, sizeof(pd));
 5898 #ifdef foo
 5899         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
 5900                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
 5901         else
 5902 #endif
 5903                 kif = (struct pfi_kif *)ifp->if_pf_kif;
 5904 
 5905         if (kif == NULL) {
 5906                 DPFPRINTF(PF_DEBUG_URGENT,
 5907                     ("pf_test: kif == NULL, if_xname %s\n", ifp->if_xname));
 5908                 return (PF_DROP);
 5909         }
 5910         if (kif->pfik_flags & PFI_IFLAG_SKIP)
 5911                 return (PF_PASS);
 5912 
 5913 #ifdef DIAGNOSTIC
 5914         if ((m->m_flags & M_PKTHDR) == 0)
 5915                 panic("non-M_PKTHDR is passed to pf_test");
 5916 #endif /* DIAGNOSTIC */
 5917 
 5918         if (m->m_pkthdr.len < (int)sizeof(*h)) {
 5919                 action = PF_DROP;
 5920                 REASON_SET(&reason, PFRES_SHORT);
 5921                 log = 1;
 5922                 goto done;
 5923         }
 5924 
 5925         /*
 5926          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
 5927          * so make sure pf.flags is clear.
 5928          */
 5929         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
 5930                 return (PF_PASS);
 5931         m->m_pkthdr.pf.flags = 0;
 5932         /* Re-Check when updating to > 4.4 */
 5933         m->m_pkthdr.pf.statekey = NULL;
 5934 
 5935         /* We do IP header normalization and packet reassembly here */
 5936         if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
 5937                 action = PF_DROP;
 5938                 goto done;
 5939         }
 5940         m = *m0;        /* pf_normalize messes with m0 */
 5941         h = mtod(m, struct ip *);
 5942 
 5943         off = h->ip_hl << 2;
 5944         if (off < (int)sizeof(*h)) {
 5945                 action = PF_DROP;
 5946                 REASON_SET(&reason, PFRES_SHORT);
 5947                 log = 1;
 5948                 goto done;
 5949         }
 5950 
 5951         pd.src = (struct pf_addr *)&h->ip_src;
 5952         pd.dst = (struct pf_addr *)&h->ip_dst;
 5953         pd.sport = pd.dport = NULL;
 5954         pd.ip_sum = &h->ip_sum;
 5955         pd.proto_sum = NULL;
 5956         pd.proto = h->ip_p;
 5957         pd.dir = dir;
 5958         pd.sidx = (dir == PF_IN) ? 0 : 1;
 5959         pd.didx = (dir == PF_IN) ? 1 : 0;
 5960         pd.af = AF_INET;
 5961         pd.tos = h->ip_tos;
 5962         pd.tot_len = h->ip_len;
 5963         pd.eh = eh;
 5964 
 5965         /* handle fragments that didn't get reassembled by normalization */
 5966         if (h->ip_off & (IP_MF | IP_OFFMASK)) {
 5967                 action = pf_test_fragment(&r, dir, kif, m, h,
 5968                     &pd, &a, &ruleset);
 5969                 goto done;
 5970         }
 5971 
 5972         switch (h->ip_p) {
 5973 
 5974         case IPPROTO_TCP: {
 5975                 struct tcphdr   th;
 5976 
 5977                 pd.hdr.tcp = &th;
 5978                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
 5979                     &action, &reason, AF_INET)) {
 5980                         log = action != PF_PASS;
 5981                         goto done;
 5982                 }
 5983                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
 5984 #ifdef ALTQ
 5985                 if ((th.th_flags & TH_ACK) && pd.p_len == 0)
 5986                         pqid = 1;
 5987 #endif
 5988                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
 5989                 if (action == PF_DROP)
 5990                         goto done;
 5991                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
 5992                     &reason);
 5993                 if (action == PF_PASS) {
 5994                         pfsync_update_state(s);
 5995                         r = s->rule.ptr;
 5996                         a = s->anchor.ptr;
 5997                         log = s->log;
 5998                 } else if (s == NULL)
 5999                         action = pf_test_rule(&r, &s, dir, kif,
 6000                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6001                 break;
 6002         }
 6003 
 6004         case IPPROTO_UDP: {
 6005                 struct udphdr   uh;
 6006 
 6007                 pd.hdr.udp = &uh;
 6008                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
 6009                     &action, &reason, AF_INET)) {
 6010                         log = action != PF_PASS;
 6011                         goto done;
 6012                 }
 6013                 if (uh.uh_dport == 0 ||
 6014                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
 6015                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
 6016                         action = PF_DROP;
 6017                         REASON_SET(&reason, PFRES_SHORT);
 6018                         goto done;
 6019                 }
 6020                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
 6021                 if (action == PF_PASS) {
 6022                         pfsync_update_state(s);
 6023                         r = s->rule.ptr;
 6024                         a = s->anchor.ptr;
 6025                         log = s->log;
 6026                 } else if (s == NULL)
 6027                         action = pf_test_rule(&r, &s, dir, kif,
 6028                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6029                 break;
 6030         }
 6031 
 6032         case IPPROTO_ICMP: {
 6033                 struct icmp     ih;
 6034 
 6035                 pd.hdr.icmp = &ih;
 6036                 if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
 6037                     &action, &reason, AF_INET)) {
 6038                         log = action != PF_PASS;
 6039                         goto done;
 6040                 }
 6041                 action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
 6042                     &reason);
 6043                 if (action == PF_PASS) {
 6044                         pfsync_update_state(s);
 6045                         r = s->rule.ptr;
 6046                         a = s->anchor.ptr;
 6047                         log = s->log;
 6048                 } else if (s == NULL)
 6049                         action = pf_test_rule(&r, &s, dir, kif,
 6050                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6051                 break;
 6052         }
 6053 
 6054         default:
 6055                 action = pf_test_state_other(&s, dir, kif, m, &pd);
 6056                 if (action == PF_PASS) {
 6057                         pfsync_update_state(s);
 6058                         r = s->rule.ptr;
 6059                         a = s->anchor.ptr;
 6060                         log = s->log;
 6061                 } else if (s == NULL)
 6062                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
 6063                             &pd, &a, &ruleset, NULL, inp);
 6064                 break;
 6065         }
 6066 
 6067 done:
 6068         if (action == PF_PASS && h->ip_hl > 5 &&
 6069             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
 6070                 action = PF_DROP;
 6071                 REASON_SET(&reason, PFRES_IPOPTIONS);
 6072                 log = 1;
 6073                 DPFPRINTF(PF_DEBUG_MISC,
 6074                     ("pf: dropping packet with ip options\n"));
 6075         }
 6076 
 6077         if ((s && s->tag) || r->rtableid)
 6078                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
 6079 
 6080 #if 0
 6081         if (dir == PF_IN && s && s->key[PF_SK_STACK])
 6082                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
 6083 #endif
 6084 
 6085 #ifdef ALTQ
 6086         if (action == PF_PASS && r->qid) {
 6087                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
 6088                 if (pqid || (pd.tos & IPTOS_LOWDELAY))
 6089                         m->m_pkthdr.pf.qid = r->pqid;
 6090                 else
 6091                         m->m_pkthdr.pf.qid = r->qid;
 6092                 m->m_pkthdr.pf.ecn_af = AF_INET;
 6093                 m->m_pkthdr.pf.hdr = h;
 6094                 /* add connection hash for fairq */
 6095                 if (s) {
 6096                         /* for fairq */
 6097                         m->m_pkthdr.pf.state_hash = s->hash;
 6098                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
 6099                 }
 6100         }
 6101 #endif /* ALTQ */
 6102 
 6103         /*
 6104          * connections redirected to loopback should not match sockets
 6105          * bound specifically to loopback due to security implications,
 6106          * see tcp_input() and in_pcblookup_listen().
 6107          */
 6108         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
 6109             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
 6110             (s->nat_rule.ptr->action == PF_RDR ||
 6111             s->nat_rule.ptr->action == PF_BINAT) &&
 6112             (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
 6113                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
 6114 
 6115         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
 6116                 struct pf_divert *divert;
 6117 
 6118                 if ((divert = pf_get_divert(m))) {
 6119                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
 6120                         divert->port = r->divert.port;
 6121                         divert->addr.ipv4 = r->divert.addr.v4;
 6122                 }
 6123         }
 6124 
 6125         if (log) {
 6126                 struct pf_rule *lr;
 6127 
 6128                 if (s != NULL && s->nat_rule.ptr != NULL &&
 6129                     s->nat_rule.ptr->log & PF_LOG_ALL)
 6130                         lr = s->nat_rule.ptr;
 6131                 else
 6132                         lr = r;
 6133                 PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
 6134                     &pd);
 6135         }
 6136 
 6137         kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
 6138         kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
 6139 
 6140         if (action == PF_PASS || r->action == PF_DROP) {
 6141                 dirndx = (dir == PF_OUT);
 6142                 r->packets[dirndx]++;
 6143                 r->bytes[dirndx] += pd.tot_len;
 6144                 if (a != NULL) {
 6145                         a->packets[dirndx]++;
 6146                         a->bytes[dirndx] += pd.tot_len;
 6147                 }
 6148                 if (s != NULL) {
 6149                         if (s->nat_rule.ptr != NULL) {
 6150                                 s->nat_rule.ptr->packets[dirndx]++;
 6151                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
 6152                         }
 6153                         if (s->src_node != NULL) {
 6154                                 s->src_node->packets[dirndx]++;
 6155                                 s->src_node->bytes[dirndx] += pd.tot_len;
 6156                         }
 6157                         if (s->nat_src_node != NULL) {
 6158                                 s->nat_src_node->packets[dirndx]++;
 6159                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
 6160                         }
 6161                         dirndx = (dir == s->direction) ? 0 : 1;
 6162                         s->packets[dirndx]++;
 6163                         s->bytes[dirndx] += pd.tot_len;
 6164                 }
 6165                 tr = r;
 6166                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
 6167                 if (nr != NULL && r == &pf_default_rule)
 6168                         tr = nr;
 6169                 if (tr->src.addr.type == PF_ADDR_TABLE)
 6170                         pfr_update_stats(tr->src.addr.p.tbl,
 6171                             (s == NULL) ? pd.src :
 6172                             &s->key[(s->direction == PF_IN)]->
 6173                                 addr[(s->direction == PF_OUT)],
 6174                             pd.af, pd.tot_len, dir == PF_OUT,
 6175                             r->action == PF_PASS, tr->src.neg);
 6176                 if (tr->dst.addr.type == PF_ADDR_TABLE)
 6177                         pfr_update_stats(tr->dst.addr.p.tbl,
 6178                             (s == NULL) ? pd.dst :
 6179                             &s->key[(s->direction == PF_IN)]->
 6180                                 addr[(s->direction == PF_IN)],
 6181                             pd.af, pd.tot_len, dir == PF_OUT,
 6182                             r->action == PF_PASS, tr->dst.neg);
 6183         }
 6184 
 6185 
 6186         if (action == PF_SYNPROXY_DROP) {
 6187                 m_freem(*m0);
 6188                 *m0 = NULL;
 6189                 action = PF_PASS;
 6190         } else if (r->rt)
 6191                 /* pf_route can free the mbuf causing *m0 to become NULL */
 6192                 pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
 6193 
 6194         return (action);
 6195 }
 6196 #endif /* INET */
 6197 
 6198 #ifdef INET6
 6199 int
 6200 pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
 6201     struct ether_header *eh, struct inpcb *inp)
 6202 {
 6203         struct pfi_kif          *kif;
 6204         u_short                  action, reason = 0, log = 0;
 6205         struct mbuf             *m = *m0, *n = NULL;
 6206         struct ip6_hdr          *h = NULL;
 6207         struct pf_rule          *a = NULL, *r = &pf_default_rule, *tr, *nr;
 6208         struct pf_state         *s = NULL;
 6209         struct pf_ruleset       *ruleset = NULL;
 6210         struct pf_pdesc          pd;
 6211         int                      off, terminal = 0, dirndx, rh_cnt = 0;
 6212 
 6213         if (!pf_status.running)
 6214                 return (PF_PASS);
 6215 
 6216         memset(&pd, 0, sizeof(pd));
 6217 #ifdef foo
 6218         if (ifp->if_type == IFT_CARP && ifp->if_carpdev)
 6219                 kif = (struct pfi_kif *)ifp->if_carpdev->if_pf_kif;
 6220         else
 6221 #endif
 6222                 kif = (struct pfi_kif *)ifp->if_pf_kif;
 6223 
 6224         if (kif == NULL) {
 6225                 DPFPRINTF(PF_DEBUG_URGENT,
 6226                     ("pf_test6: kif == NULL, if_xname %s\n", ifp->if_xname));
 6227                 return (PF_DROP);
 6228         }
 6229         if (kif->pfik_flags & PFI_IFLAG_SKIP)
 6230                 return (PF_PASS);
 6231 
 6232 #ifdef DIAGNOSTIC
 6233         if ((m->m_flags & M_PKTHDR) == 0)
 6234                 panic("non-M_PKTHDR is passed to pf_test6");
 6235 #endif /* DIAGNOSTIC */
 6236 
 6237         if (m->m_pkthdr.len < (int)sizeof(*h)) {
 6238                 action = PF_DROP;
 6239                 REASON_SET(&reason, PFRES_SHORT);
 6240                 log = 1;
 6241                 goto done;
 6242         }
 6243 
 6244         /*
 6245          * DragonFly doesn't zero the auxillary pkghdr fields, only fw_flags,
 6246          * so make sure pf.flags is clear.
 6247          */
 6248         if (m->m_pkthdr.fw_flags & PF_MBUF_TAGGED)
 6249                 return (PF_PASS);
 6250         m->m_pkthdr.pf.flags = 0;
 6251         /* Re-Check when updating to > 4.4 */
 6252         m->m_pkthdr.pf.statekey = NULL;
 6253 
 6254         /* We do IP header normalization and packet reassembly here */
 6255         if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
 6256                 action = PF_DROP;
 6257                 goto done;
 6258         }
 6259         m = *m0;        /* pf_normalize messes with m0 */
 6260         h = mtod(m, struct ip6_hdr *);
 6261 
 6262 #if 1
 6263         /*
 6264          * we do not support jumbogram yet.  if we keep going, zero ip6_plen
 6265          * will do something bad, so drop the packet for now.
 6266          */
 6267         if (htons(h->ip6_plen) == 0) {
 6268                 action = PF_DROP;
 6269                 REASON_SET(&reason, PFRES_NORM);        /*XXX*/
 6270                 goto done;
 6271         }
 6272 #endif
 6273 
 6274         pd.src = (struct pf_addr *)&h->ip6_src;
 6275         pd.dst = (struct pf_addr *)&h->ip6_dst;
 6276         pd.sport = pd.dport = NULL;
 6277         pd.ip_sum = NULL;
 6278         pd.proto_sum = NULL;
 6279         pd.dir = dir;
 6280         pd.sidx = (dir == PF_IN) ? 0 : 1;
 6281         pd.didx = (dir == PF_IN) ? 1 : 0;
 6282         pd.af = AF_INET6;
 6283         pd.tos = 0;
 6284         pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
 6285         pd.eh = eh;
 6286 
 6287         off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
 6288         pd.proto = h->ip6_nxt;
 6289         do {
 6290                 switch (pd.proto) {
 6291                 case IPPROTO_FRAGMENT:
 6292                         action = pf_test_fragment(&r, dir, kif, m, h,
 6293                             &pd, &a, &ruleset);
 6294                         if (action == PF_DROP)
 6295                                 REASON_SET(&reason, PFRES_FRAG);
 6296                         goto done;
 6297                 case IPPROTO_ROUTING: {
 6298                         struct ip6_rthdr rthdr;
 6299 
 6300                         if (rh_cnt++) {
 6301                                 DPFPRINTF(PF_DEBUG_MISC,
 6302                                     ("pf: IPv6 more than one rthdr\n"));
 6303                                 action = PF_DROP;
 6304                                 REASON_SET(&reason, PFRES_IPOPTIONS);
 6305                                 log = 1;
 6306                                 goto done;
 6307                         }
 6308                         if (!pf_pull_hdr(m, off, &rthdr, sizeof(rthdr), NULL,
 6309                             &reason, pd.af)) {
 6310                                 DPFPRINTF(PF_DEBUG_MISC,
 6311                                     ("pf: IPv6 short rthdr\n"));
 6312                                 action = PF_DROP;
 6313                                 REASON_SET(&reason, PFRES_SHORT);
 6314                                 log = 1;
 6315                                 goto done;
 6316                         }
 6317                         if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
 6318                                 DPFPRINTF(PF_DEBUG_MISC,
 6319                                     ("pf: IPv6 rthdr0\n"));
 6320                                 action = PF_DROP;
 6321                                 REASON_SET(&reason, PFRES_IPOPTIONS);
 6322                                 log = 1;
 6323                                 goto done;
 6324                         }
 6325                         /* FALLTHROUGH */
 6326                 }
 6327                 case IPPROTO_AH:
 6328                 case IPPROTO_HOPOPTS:
 6329                 case IPPROTO_DSTOPTS: {
 6330                         /* get next header and header length */
 6331                         struct ip6_ext  opt6;
 6332 
 6333                         if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
 6334                             NULL, &reason, pd.af)) {
 6335                                 DPFPRINTF(PF_DEBUG_MISC,
 6336                                     ("pf: IPv6 short opt\n"));
 6337                                 action = PF_DROP;
 6338                                 log = 1;
 6339                                 goto done;
 6340                         }
 6341                         if (pd.proto == IPPROTO_AH)
 6342                                 off += (opt6.ip6e_len + 2) * 4;
 6343                         else
 6344                                 off += (opt6.ip6e_len + 1) * 8;
 6345                         pd.proto = opt6.ip6e_nxt;
 6346                         /* goto the next header */
 6347                         break;
 6348                 }
 6349                 default:
 6350                         terminal++;
 6351                         break;
 6352                 }
 6353         } while (!terminal);
 6354 
 6355         /* if there's no routing header, use unmodified mbuf for checksumming */
 6356         if (!n)
 6357                 n = m;
 6358 
 6359         switch (pd.proto) {
 6360 
 6361         case IPPROTO_TCP: {
 6362                 struct tcphdr   th;
 6363 
 6364                 pd.hdr.tcp = &th;
 6365                 if (!pf_pull_hdr(m, off, &th, sizeof(th),
 6366                     &action, &reason, AF_INET6)) {
 6367                         log = action != PF_PASS;
 6368                         goto done;
 6369                 }
 6370                 pd.p_len = pd.tot_len - off - (th.th_off << 2);
 6371                 action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
 6372                 if (action == PF_DROP)
 6373                         goto done;
 6374                 action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
 6375                     &reason);
 6376                 if (action == PF_PASS) {
 6377                         pfsync_update_state(s);
 6378                         r = s->rule.ptr;
 6379                         a = s->anchor.ptr;
 6380                         log = s->log;
 6381                 } else if (s == NULL)
 6382                         action = pf_test_rule(&r, &s, dir, kif,
 6383                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6384                 break;
 6385         }
 6386 
 6387         case IPPROTO_UDP: {
 6388                 struct udphdr   uh;
 6389 
 6390                 pd.hdr.udp = &uh;
 6391                 if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
 6392                     &action, &reason, AF_INET6)) {
 6393                         log = action != PF_PASS;
 6394                         goto done;
 6395                 }
 6396                 if (uh.uh_dport == 0 ||
 6397                     ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
 6398                     ntohs(uh.uh_ulen) < sizeof(struct udphdr)) {
 6399                         action = PF_DROP;
 6400                         REASON_SET(&reason, PFRES_SHORT);
 6401                         goto done;
 6402                 }
 6403                 action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
 6404                 if (action == PF_PASS) {
 6405                         pfsync_update_state(s);
 6406                         r = s->rule.ptr;
 6407                         a = s->anchor.ptr;
 6408                         log = s->log;
 6409                 } else if (s == NULL)
 6410                         action = pf_test_rule(&r, &s, dir, kif,
 6411                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6412                 break;
 6413         }
 6414 
 6415         case IPPROTO_ICMPV6: {
 6416                 struct icmp6_hdr        ih;
 6417 
 6418                 pd.hdr.icmp6 = &ih;
 6419                 if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
 6420                     &action, &reason, AF_INET6)) {
 6421                         log = action != PF_PASS;
 6422                         goto done;
 6423                 }
 6424                 action = pf_test_state_icmp(&s, dir, kif,
 6425                     m, off, h, &pd, &reason);
 6426                 if (action == PF_PASS) {
 6427                         pfsync_update_state(s);
 6428                         r = s->rule.ptr;
 6429                         a = s->anchor.ptr;
 6430                         log = s->log;
 6431                 } else if (s == NULL)
 6432                         action = pf_test_rule(&r, &s, dir, kif,
 6433                             m, off, h, &pd, &a, &ruleset, NULL, inp);
 6434                 break;
 6435         }
 6436 
 6437         default:
 6438                 action = pf_test_state_other(&s, dir, kif, m, &pd);
 6439                 if (action == PF_PASS) {
 6440                         pfsync_update_state(s);
 6441                         r = s->rule.ptr;
 6442                         a = s->anchor.ptr;
 6443                         log = s->log;
 6444                 } else if (s == NULL)
 6445                         action = pf_test_rule(&r, &s, dir, kif, m, off, h,
 6446                             &pd, &a, &ruleset, NULL, inp);
 6447                 break;
 6448         }
 6449 
 6450 done:
 6451         if (n != m) {
 6452                 m_freem(n);
 6453                 n = NULL;
 6454         }
 6455 
 6456         /* handle dangerous IPv6 extension headers. */
 6457         if (action == PF_PASS && rh_cnt &&
 6458             !((s && s->state_flags & PFSTATE_ALLOWOPTS) || r->allow_opts)) {
 6459                 action = PF_DROP;
 6460                 REASON_SET(&reason, PFRES_IPOPTIONS);
 6461                 log = 1;
 6462                 DPFPRINTF(PF_DEBUG_MISC,
 6463                     ("pf: dropping packet with dangerous v6 headers\n"));
 6464         }
 6465 
 6466         if ((s && s->tag) || r->rtableid)
 6467                 pf_tag_packet(m, s ? s->tag : 0, r->rtableid);
 6468 
 6469 #if 0
 6470         if (dir == PF_IN && s && s->key[PF_SK_STACK])
 6471                 m->m_pkthdr.pf.statekey = s->key[PF_SK_STACK];
 6472 #endif
 6473 
 6474 #ifdef ALTQ
 6475         if (action == PF_PASS && r->qid) {
 6476                 m->m_pkthdr.fw_flags |= PF_MBUF_STRUCTURE;
 6477                 if (pd.tos & IPTOS_LOWDELAY)
 6478                         m->m_pkthdr.pf.qid = r->pqid;
 6479                 else
 6480                         m->m_pkthdr.pf.qid = r->qid;
 6481                 m->m_pkthdr.pf.ecn_af = AF_INET6;
 6482                 m->m_pkthdr.pf.hdr = h;
 6483                 if (s) {
 6484                         /* for fairq */
 6485                         m->m_pkthdr.pf.state_hash = s->hash;
 6486                         m->m_pkthdr.pf.flags |= PF_TAG_STATE_HASHED;
 6487                 }
 6488         }
 6489 #endif /* ALTQ */
 6490 
 6491         if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
 6492             pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
 6493             (s->nat_rule.ptr->action == PF_RDR ||
 6494             s->nat_rule.ptr->action == PF_BINAT) &&
 6495             IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
 6496                 m->m_pkthdr.pf.flags |= PF_TAG_TRANSLATE_LOCALHOST;
 6497 
 6498         if (dir == PF_IN && action == PF_PASS && r->divert.port) {
 6499                 struct pf_divert *divert;
 6500 
 6501                 if ((divert = pf_get_divert(m))) {
 6502                         m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED;
 6503                         divert->port = r->divert.port;
 6504                         divert->addr.ipv6 = r->divert.addr.v6;
 6505                 }
 6506         }
 6507 
 6508         if (log) {
 6509                 struct pf_rule *lr;
 6510 
 6511                 if (s != NULL && s->nat_rule.ptr != NULL &&
 6512                     s->nat_rule.ptr->log & PF_LOG_ALL)
 6513                         lr = s->nat_rule.ptr;
 6514                 else
 6515                         lr = r;
 6516                 PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
 6517                     &pd);
 6518         }
 6519 
 6520         kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
 6521         kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
 6522 
 6523         if (action == PF_PASS || r->action == PF_DROP) {
 6524                 dirndx = (dir == PF_OUT);
 6525                 r->packets[dirndx]++;
 6526                 r->bytes[dirndx] += pd.tot_len;
 6527                 if (a != NULL) {
 6528                         a->packets[dirndx]++;
 6529                         a->bytes[dirndx] += pd.tot_len;
 6530                 }
 6531                 if (s != NULL) {
 6532                         if (s->nat_rule.ptr != NULL) {
 6533                                 s->nat_rule.ptr->packets[dirndx]++;
 6534                                 s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
 6535                         }
 6536                         if (s->src_node != NULL) {
 6537                                 s->src_node->packets[dirndx]++;
 6538                                 s->src_node->bytes[dirndx] += pd.tot_len;
 6539                         }
 6540                         if (s->nat_src_node != NULL) {
 6541                                 s->nat_src_node->packets[dirndx]++;
 6542                                 s->nat_src_node->bytes[dirndx] += pd.tot_len;
 6543                         }
 6544                         dirndx = (dir == s->direction) ? 0 : 1;
 6545                         s->packets[dirndx]++;
 6546                         s->bytes[dirndx] += pd.tot_len;
 6547                 }
 6548                 tr = r;
 6549                 nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
 6550                 if (nr != NULL && r == &pf_default_rule)
 6551                         tr = nr;
 6552                 if (tr->src.addr.type == PF_ADDR_TABLE)
 6553                         pfr_update_stats(tr->src.addr.p.tbl,
 6554                             (s == NULL) ? pd.src :
 6555                             &s->key[(s->direction == PF_IN)]->addr[0],
 6556                             pd.af, pd.tot_len, dir == PF_OUT,
 6557                             r->action == PF_PASS, tr->src.neg);
 6558                 if (tr->dst.addr.type == PF_ADDR_TABLE)
 6559                         pfr_update_stats(tr->dst.addr.p.tbl,
 6560                             (s == NULL) ? pd.dst :
 6561                             &s->key[(s->direction == PF_IN)]->addr[1],
 6562                             pd.af, pd.tot_len, dir == PF_OUT,
 6563                             r->action == PF_PASS, tr->dst.neg);
 6564         }
 6565 
 6566 
 6567         if (action == PF_SYNPROXY_DROP) {
 6568                 m_freem(*m0);
 6569                 *m0 = NULL;
 6570                 action = PF_PASS;
 6571         } else if (r->rt)
 6572                 /* pf_route6 can free the mbuf causing *m0 to become NULL */
 6573                 pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
 6574 
 6575         return (action);
 6576 }
 6577 #endif /* INET6 */
 6578 
 6579 int
 6580 pf_check_congestion(struct ifqueue *ifq)
 6581 {
 6582                 return (0);
 6583 }

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