sys/netpfil/pf/pf_lb.c

   1 /*-
   2  * Copyright (c) 2001 Daniel Hartmeier
   3  * Copyright (c) 2002 - 2008 Henning Brauer
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  *    - Redistributions of source code must retain the above copyright
  11  *      notice, this list of conditions and the following disclaimer.
  12  *    - Redistributions in binary form must reproduce the above
  13  *      copyright notice, this list of conditions and the following
  14  *      disclaimer in the documentation and/or other materials provided
  15  *      with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  20  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  21  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * Effort sponsored in part by the Defense Advanced Research Projects
  31  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  32  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  33  *
  34  *      $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include "opt_pf.h"
  41 #include "opt_inet.h"
  42 #include "opt_inet6.h"
  43
  44 #include <sys/param.h>
  45 #include <sys/socket.h>
  46 #include <sys/sysctl.h>
  47
  48 #include <net/if.h>
  49 #include <net/pfvar.h>
  50 #include <net/if_pflog.h>
  51
  52 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
  53
  54 static void              pf_hash(struct pf_addr *, struct pf_addr *,
  55                             struct pf_poolhashkey *, sa_family_t);
  56 static struct pf_rule   *pf_match_translation(struct pf_pdesc *, struct mbuf *,
  57                             int, int, struct pfi_kif *,
  58                             struct pf_addr *, u_int16_t, struct pf_addr *,
  59                             uint16_t, int, struct pf_anchor_stackframe *);
  60 static int pf_get_sport(sa_family_t, uint8_t, struct pf_rule *,
  61     struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
  62     uint16_t *, uint16_t, uint16_t, struct pf_src_node **);
  63
  64 #define mix(a,b,c) \
  65         do {                                    \
  66                 a -= b; a -= c; a ^= (c >> 13); \
  67                 b -= c; b -= a; b ^= (a << 8);  \
  68                 c -= a; c -= b; c ^= (b >> 13); \
  69                 a -= b; a -= c; a ^= (c >> 12); \
  70                 b -= c; b -= a; b ^= (a << 16); \
  71                 c -= a; c -= b; c ^= (b >> 5);  \
  72                 a -= b; a -= c; a ^= (c >> 3);  \
  73                 b -= c; b -= a; b ^= (a << 10); \
  74                 c -= a; c -= b; c ^= (b >> 15); \
  75         } while (0)
  76
  77 /*
  78  * hash function based on bridge_hash in if_bridge.c
  79  */
  80 static void
  81 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
  82     struct pf_poolhashkey *key, sa_family_t af)
  83 {
  84         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
  85
  86         switch (af) {
  87 #ifdef INET
  88         case AF_INET:
  89                 a += inaddr->addr32[0];
  90                 b += key->key32[1];
  91                 mix(a, b, c);
  92                 hash->addr32[0] = c + key->key32[2];
  93                 break;
  94 #endif /* INET */
  95 #ifdef INET6
  96         case AF_INET6:
  97                 a += inaddr->addr32[0];
  98                 b += inaddr->addr32[2];
  99                 mix(a, b, c);
 100                 hash->addr32[0] = c;
 101                 a += inaddr->addr32[1];
 102                 b += inaddr->addr32[3];
 103                 c += key->key32[1];
 104                 mix(a, b, c);
 105                 hash->addr32[1] = c;
 106                 a += inaddr->addr32[2];
 107                 b += inaddr->addr32[1];
 108                 c += key->key32[2];
 109                 mix(a, b, c);
 110                 hash->addr32[2] = c;
 111                 a += inaddr->addr32[3];
 112                 b += inaddr->addr32[0];
 113                 c += key->key32[3];
 114                 mix(a, b, c);
 115                 hash->addr32[3] = c;
 116                 break;
 117 #endif /* INET6 */
 118         }
 119 }
 120
 121 static struct pf_rule *
 122 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
 123     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
 124     struct pf_addr *daddr, uint16_t dport, int rs_num,
 125     struct pf_anchor_stackframe *anchor_stack)
 126 {
 127         struct pf_rule          *r, *rm = NULL;
 128         struct pf_ruleset       *ruleset = NULL;
 129         int                      tag = -1;
 130         int                      rtableid = -1;
 131         int                      asd = 0;
 132
 133         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
 134         while (r && rm == NULL) {
 135                 struct pf_rule_addr     *src = NULL, *dst = NULL;
 136                 struct pf_addr_wrap     *xdst = NULL;
 137
 138                 if (r->action == PF_BINAT && direction == PF_IN) {
 139                         src = &r->dst;
 140                         if (r->rpool.cur != NULL)
 141                                 xdst = &r->rpool.cur->addr;
 142                 } else {
 143                         src = &r->src;
 144                         dst = &r->dst;
 145                 }
 146
 147                 r->evaluations++;
 148                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 149                         r = r->skip[PF_SKIP_IFP].ptr;
 150                 else if (r->direction && r->direction != direction)
 151                         r = r->skip[PF_SKIP_DIR].ptr;
 152                 else if (r->af && r->af != pd->af)
 153                         r = r->skip[PF_SKIP_AF].ptr;
 154                 else if (r->proto && r->proto != pd->proto)
 155                         r = r->skip[PF_SKIP_PROTO].ptr;
 156                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
 157                     src->neg, kif, M_GETFIB(m)))
 158                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
 159                             PF_SKIP_DST_ADDR].ptr;
 160                 else if (src->port_op && !pf_match_port(src->port_op,
 161                     src->port[0], src->port[1], sport))
 162                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
 163                             PF_SKIP_DST_PORT].ptr;
 164                 else if (dst != NULL &&
 165                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL,
 166                     M_GETFIB(m)))
 167                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 168                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
 169                     0, NULL, M_GETFIB(m)))
 170                         r = TAILQ_NEXT(r, entries);
 171                 else if (dst != NULL && dst->port_op &&
 172                     !pf_match_port(dst->port_op, dst->port[0],
 173                     dst->port[1], dport))
 174                         r = r->skip[PF_SKIP_DST_PORT].ptr;
 175                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
 176                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
 177                         r = TAILQ_NEXT(r, entries);
 178                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
 179                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
 180                     off, pd->hdr.tcp), r->os_fingerprint)))
 181                         r = TAILQ_NEXT(r, entries);
 182                 else {
 183                         if (r->tag)
 184                                 tag = r->tag;
 185                         if (r->rtableid >= 0)
 186                                 rtableid = r->rtableid;
 187                         if (r->anchor == NULL) {
 188                                 rm = r;
 189                         } else
 190                                 pf_step_into_anchor(anchor_stack, &asd,
 191                                     &ruleset, rs_num, &r, NULL, NULL);
 192                 }
 193                 if (r == NULL)
 194                         pf_step_out_of_anchor(anchor_stack, &asd, &ruleset,
 195                             rs_num, &r, NULL, NULL);
 196         }
 197
 198         if (tag > 0 && pf_tag_packet(m, pd, tag))
 199                 return (NULL);
 200         if (rtableid >= 0)
 201                 M_SETFIB(m, rtableid);
 202
 203         if (rm != NULL && (rm->action == PF_NONAT ||
 204             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
 205                 return (NULL);
 206         return (rm);
 207 }
 208
 209 static int
 210 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
 211     struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
 212     uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low,
 213     uint16_t high, struct pf_src_node **sn)
 214 {
 215         struct pf_state_key_cmp key;
 216         struct pf_addr          init_addr;
 217         uint16_t                cut;
 218
 219         bzero(&init_addr, sizeof(init_addr));
 220         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 221                 return (1);
 222
 223         if (proto == IPPROTO_ICMP) {
 224                 low = 1;
 225                 high = 65535;
 226         }
 227
 228         bzero(&key, sizeof(key));
 229         key.af = af;
 230         key.proto = proto;
 231         key.port[0] = dport;
 232         PF_ACPY(&key.addr[0], daddr, key.af);
 233
 234         do {
 235                 PF_ACPY(&key.addr[1], naddr, key.af);
 236
 237                 /*
 238                  * port search; start random, step;
 239                  * similar 2 portloop in in_pcbbind
 240                  */
 241                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
 242                     proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
 243                         /*
 244                          * XXX bug: icmp states don't use the id on both sides.
 245                          * (traceroute -I through nat)
 246                          */
 247                         key.port[1] = sport;
 248                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 249                                 *nport = sport;
 250                                 return (0);
 251                         }
 252                 } else if (low == high) {
 253                         key.port[1] = htons(low);
 254                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 255                                 *nport = htons(low);
 256                                 return (0);
 257                         }
 258                 } else {
 259                         uint16_t tmp;
 260
 261                         if (low > high) {
 262                                 tmp = low;
 263                                 low = high;
 264                                 high = tmp;
 265                         }
 266                         /* low < high */
 267                         cut = htonl(arc4random()) % (1 + high - low) + low;
 268                         /* low <= cut <= high */
 269                         for (tmp = cut; tmp <= high; ++(tmp)) {
 270                                 key.port[1] = htons(tmp);
 271                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 272                                     NULL) {
 273                                         *nport = htons(tmp);
 274                                         return (0);
 275                                 }
 276                         }
 277                         for (tmp = cut - 1; tmp >= low; --(tmp)) {
 278                                 key.port[1] = htons(tmp);
 279                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 280                                     NULL) {
 281                                         *nport = htons(tmp);
 282                                         return (0);
 283                                 }
 284                         }
 285                 }
 286
 287                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
 288                 case PF_POOL_RANDOM:
 289                 case PF_POOL_ROUNDROBIN:
 290                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 291                                 return (1);
 292                         break;
 293                 case PF_POOL_NONE:
 294                 case PF_POOL_SRCHASH:
 295                 case PF_POOL_BITMASK:
 296                 default:
 297                         return (1);
 298                 }
 299         } while (! PF_AEQ(&init_addr, naddr, af) );
 300         return (1);                                     /* none available */
 301 }
 302
 303 int
 304 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
 305     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
 306 {
 307         struct pf_pool          *rpool = &r->rpool;
 308         struct pf_addr          *raddr = NULL, *rmask = NULL;
 309
 310         /* Try to find a src_node if none was given and this
 311            is a sticky-address rule. */
 312         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
 313             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
 314                 *sn = pf_find_src_node(saddr, r, af, 0);
 315
 316         /* If a src_node was found or explicitly given and it has a non-zero
 317            route address, use this address. A zeroed address is found if the
 318            src node was created just a moment ago in pf_create_state and it
 319            needs to be filled in with routing decision calculated here. */
 320         if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
 321                 PF_ACPY(naddr, &(*sn)->raddr, af);
 322                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 323                         printf("pf_map_addr: src tracking maps ");
 324                         pf_print_host(saddr, 0, af);
 325                         printf(" to ");
 326                         pf_print_host(naddr, 0, af);
 327                         printf("\n");
 328                 }
 329                 return (0);
 330         }
 331
 332         /* Find the route using chosen algorithm. Store the found route
 333            in src_node if it was given or found. */
 334         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
 335                 return (1);
 336         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 337                 switch (af) {
 338 #ifdef INET
 339                 case AF_INET:
 340                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
 341                             (rpool->opts & PF_POOL_TYPEMASK) !=
 342                             PF_POOL_ROUNDROBIN)
 343                                 return (1);
 344                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
 345                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
 346                         break;
 347 #endif /* INET */
 348 #ifdef INET6
 349                 case AF_INET6:
 350                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
 351                             (rpool->opts & PF_POOL_TYPEMASK) !=
 352                             PF_POOL_ROUNDROBIN)
 353                                 return (1);
 354                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
 355                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
 356                         break;
 357 #endif /* INET6 */
 358                 }
 359         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 360                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
 361                         return (1); /* unsupported */
 362         } else {
 363                 raddr = &rpool->cur->addr.v.a.addr;
 364                 rmask = &rpool->cur->addr.v.a.mask;
 365         }
 366
 367         switch (rpool->opts & PF_POOL_TYPEMASK) {
 368         case PF_POOL_NONE:
 369                 PF_ACPY(naddr, raddr, af);
 370                 break;
 371         case PF_POOL_BITMASK:
 372                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
 373                 break;
 374         case PF_POOL_RANDOM:
 375                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
 376                         switch (af) {
 377 #ifdef INET
 378                         case AF_INET:
 379                                 rpool->counter.addr32[0] = htonl(arc4random());
 380                                 break;
 381 #endif /* INET */
 382 #ifdef INET6
 383                         case AF_INET6:
 384                                 if (rmask->addr32[3] != 0xffffffff)
 385                                         rpool->counter.addr32[3] =
 386                                             htonl(arc4random());
 387                                 else
 388                                         break;
 389                                 if (rmask->addr32[2] != 0xffffffff)
 390                                         rpool->counter.addr32[2] =
 391                                             htonl(arc4random());
 392                                 else
 393                                         break;
 394                                 if (rmask->addr32[1] != 0xffffffff)
 395                                         rpool->counter.addr32[1] =
 396                                             htonl(arc4random());
 397                                 else
 398                                         break;
 399                                 if (rmask->addr32[0] != 0xffffffff)
 400                                         rpool->counter.addr32[0] =
 401                                             htonl(arc4random());
 402                                 break;
 403 #endif /* INET6 */
 404                         }
 405                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 406                         PF_ACPY(init_addr, naddr, af);
 407
 408                 } else {
 409                         PF_AINC(&rpool->counter, af);
 410                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 411                 }
 412                 break;
 413         case PF_POOL_SRCHASH:
 414             {
 415                 unsigned char hash[16];
 416
 417                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
 418                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
 419                 break;
 420             }
 421         case PF_POOL_ROUNDROBIN:
 422             {
 423                 struct pf_pooladdr *acur = rpool->cur;
 424
 425                 /*
 426                  * XXXGL: in the round-robin case we need to store
 427                  * the round-robin machine state in the rule, thus
 428                  * forwarding thread needs to modify rule.
 429                  *
 430                  * This is done w/o locking, because performance is assumed
 431                  * more important than round-robin precision.
 432                  *
 433                  * In the simpliest case we just update the "rpool->cur"
 434                  * pointer. However, if pool contains tables or dynamic
 435                  * addresses, then "tblidx" is also used to store machine
 436                  * state. Since "tblidx" is int, concurrent access to it can't
 437                  * lead to inconsistence, only to lost of precision.
 438                  *
 439                  * Things get worse, if table contains not hosts, but
 440                  * prefixes. In this case counter also stores machine state,
 441                  * and for IPv6 address, counter can't be updated atomically.
 442                  * Probably, using round-robin on a table containing IPv6
 443                  * prefixes (or even IPv4) would cause a panic.
 444                  */
 445
 446                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 447                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
 448                             &rpool->tblidx, &rpool->counter, af))
 449                                 goto get_addr;
 450                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 451                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 452                             &rpool->tblidx, &rpool->counter, af))
 453                                 goto get_addr;
 454                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
 455                         goto get_addr;
 456
 457         try_next:
 458                 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
 459                         rpool->cur = TAILQ_FIRST(&rpool->list);
 460                 else
 461                         rpool->cur = TAILQ_NEXT(rpool->cur, entries);
 462                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 463                         rpool->tblidx = -1;
 464                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
 465                             &rpool->tblidx, &rpool->counter, af)) {
 466                                 /* table contains no address of type 'af' */
 467                                 if (rpool->cur != acur)
 468                                         goto try_next;
 469                                 return (1);
 470                         }
 471                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 472                         rpool->tblidx = -1;
 473                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 474                             &rpool->tblidx, &rpool->counter, af)) {
 475                                 /* table contains no address of type 'af' */
 476                                 if (rpool->cur != acur)
 477                                         goto try_next;
 478                                 return (1);
 479                         }
 480                 } else {
 481                         raddr = &rpool->cur->addr.v.a.addr;
 482                         rmask = &rpool->cur->addr.v.a.mask;
 483                         PF_ACPY(&rpool->counter, raddr, af);
 484                 }
 485
 486         get_addr:
 487                 PF_ACPY(naddr, &rpool->counter, af);
 488                 if (init_addr != NULL && PF_AZERO(init_addr, af))
 489                         PF_ACPY(init_addr, naddr, af);
 490                 PF_AINC(&rpool->counter, af);
 491                 break;
 492             }
 493         }
 494         if (*sn != NULL)
 495                 PF_ACPY(&(*sn)->raddr, naddr, af);
 496
 497         if (V_pf_status.debug >= PF_DEBUG_MISC &&
 498             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 499                 printf("pf_map_addr: selected address ");
 500                 pf_print_host(naddr, 0, af);
 501                 printf("\n");
 502         }
 503
 504         return (0);
 505 }
 506
 507 struct pf_rule *
 508 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
 509     struct pfi_kif *kif, struct pf_src_node **sn,
 510     struct pf_state_key **skp, struct pf_state_key **nkp,
 511     struct pf_addr *saddr, struct pf_addr *daddr,
 512     uint16_t sport, uint16_t dport, struct pf_anchor_stackframe *anchor_stack)
 513 {
 514         struct pf_rule  *r = NULL;
 515         struct pf_addr  *naddr;
 516         uint16_t        *nport;
 517
 518         PF_RULES_RASSERT();
 519         KASSERT(*skp == NULL, ("*skp not NULL"));
 520         KASSERT(*nkp == NULL, ("*nkp not NULL"));
 521
 522         if (direction == PF_OUT) {
 523                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 524                     sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
 525                 if (r == NULL)
 526                         r = pf_match_translation(pd, m, off, direction, kif,
 527                             saddr, sport, daddr, dport, PF_RULESET_NAT,
 528                             anchor_stack);
 529         } else {
 530                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 531                     sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
 532                 if (r == NULL)
 533                         r = pf_match_translation(pd, m, off, direction, kif,
 534                             saddr, sport, daddr, dport, PF_RULESET_BINAT,
 535                             anchor_stack);
 536         }
 537
 538         if (r == NULL)
 539                 return (NULL);
 540
 541         switch (r->action) {
 542         case PF_NONAT:
 543         case PF_NOBINAT:
 544         case PF_NORDR:
 545                 return (NULL);
 546         }
 547
 548         *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
 549         if (*skp == NULL)
 550                 return (NULL);
 551         *nkp = pf_state_key_clone(*skp);
 552         if (*nkp == NULL) {
 553                 uma_zfree(V_pf_state_key_z, skp);
 554                 *skp = NULL;
 555                 return (NULL);
 556         }
 557
 558         /* XXX We only modify one side for now. */
 559         naddr = &(*nkp)->addr[1];
 560         nport = &(*nkp)->port[1];
 561
 562         switch (r->action) {
 563         case PF_NAT:
 564                 if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, daddr,
 565                     dport, naddr, nport, r->rpool.proxy_port[0],
 566                     r->rpool.proxy_port[1], sn)) {
 567                         DPFPRINTF(PF_DEBUG_MISC,
 568                             ("pf: NAT proxy port allocation (%u-%u) failed\n",
 569                             r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
 570                         goto notrans;
 571                 }
 572                 break;
 573         case PF_BINAT:
 574                 switch (direction) {
 575                 case PF_OUT:
 576                         if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
 577                                 switch (pd->af) {
 578 #ifdef INET
 579                                 case AF_INET:
 580                                         if (r->rpool.cur->addr.p.dyn->
 581                                             pfid_acnt4 < 1)
 582                                                 goto notrans;
 583                                         PF_POOLMASK(naddr,
 584                                             &r->rpool.cur->addr.p.dyn->
 585                                             pfid_addr4,
 586                                             &r->rpool.cur->addr.p.dyn->
 587                                             pfid_mask4, saddr, AF_INET);
 588                                         break;
 589 #endif /* INET */
 590 #ifdef INET6
 591                                 case AF_INET6:
 592                                         if (r->rpool.cur->addr.p.dyn->
 593                                             pfid_acnt6 < 1)
 594                                                 goto notrans;
 595                                         PF_POOLMASK(naddr,
 596                                             &r->rpool.cur->addr.p.dyn->
 597                                             pfid_addr6,
 598                                             &r->rpool.cur->addr.p.dyn->
 599                                             pfid_mask6, saddr, AF_INET6);
 600                                         break;
 601 #endif /* INET6 */
 602                                 }
 603                         } else
 604                                 PF_POOLMASK(naddr,
 605                                     &r->rpool.cur->addr.v.a.addr,
 606                                     &r->rpool.cur->addr.v.a.mask, saddr,
 607                                     pd->af);
 608                         break;
 609                 case PF_IN:
 610                         if (r->src.addr.type == PF_ADDR_DYNIFTL) {
 611                                 switch (pd->af) {
 612 #ifdef INET
 613                                 case AF_INET:
 614                                         if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
 615                                                 goto notrans;
 616                                         PF_POOLMASK(naddr,
 617                                             &r->src.addr.p.dyn->pfid_addr4,
 618                                             &r->src.addr.p.dyn->pfid_mask4,
 619                                             daddr, AF_INET);
 620                                         break;
 621 #endif /* INET */
 622 #ifdef INET6
 623                                 case AF_INET6:
 624                                         if (r->src.addr.p.dyn->pfid_acnt6 < 1)
 625                                                 goto notrans;
 626                                         PF_POOLMASK(naddr,
 627                                             &r->src.addr.p.dyn->pfid_addr6,
 628                                             &r->src.addr.p.dyn->pfid_mask6,
 629                                             daddr, AF_INET6);
 630                                         break;
 631 #endif /* INET6 */
 632                                 }
 633                         } else
 634                                 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
 635                                     &r->src.addr.v.a.mask, daddr, pd->af);
 636                         break;
 637                 }
 638                 break;
 639         case PF_RDR: {
 640                 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
 641                         goto notrans;
 642                 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
 643                         PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
 644                             daddr, pd->af);
 645
 646                 if (r->rpool.proxy_port[1]) {
 647                         uint32_t        tmp_nport;
 648
 649                         tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
 650                             (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
 651                             1)) + r->rpool.proxy_port[0];
 652
 653                         /* Wrap around if necessary. */
 654                         if (tmp_nport > 65535)
 655                                 tmp_nport -= 65535;
 656                         *nport = htons((uint16_t)tmp_nport);
 657                 } else if (r->rpool.proxy_port[0])
 658                         *nport = htons(r->rpool.proxy_port[0]);
 659                 break;
 660         }
 661         default:
 662                 panic("%s: unknown action %u", __func__, r->action);
 663         }
 664
 665         /* Return success only if translation really happened. */
 666         if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
 667                 return (r);
 668
 669 notrans:
 670         uma_zfree(V_pf_state_key_z, *nkp);
 671         uma_zfree(V_pf_state_key_z, *skp);
 672         *skp = *nkp = NULL;
 673         *sn = NULL;
 674
 675         return (NULL);
 676 }