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/lock.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/rwlock.h>
  48 #include <sys/socket.h>
  49 #include <sys/sysctl.h>
  50
  51 #include <net/if.h>
  52 #include <net/vnet.h>
  53 #include <net/pfvar.h>
  54 #include <net/if_pflog.h>
  55
  56 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
  57
  58 static void              pf_hash(struct pf_addr *, struct pf_addr *,
  59                             struct pf_poolhashkey *, sa_family_t);
  60 static struct pf_rule   *pf_match_translation(struct pf_pdesc *, struct mbuf *,
  61                             int, int, struct pfi_kif *,
  62                             struct pf_addr *, u_int16_t, struct pf_addr *,
  63                             uint16_t, int, struct pf_anchor_stackframe *);
  64 static int pf_get_sport(sa_family_t, uint8_t, struct pf_rule *,
  65     struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
  66     uint16_t *, uint16_t, uint16_t, struct pf_src_node **);
  67
  68 #define mix(a,b,c) \
  69         do {                                    \
  70                 a -= b; a -= c; a ^= (c >> 13); \
  71                 b -= c; b -= a; b ^= (a << 8);  \
  72                 c -= a; c -= b; c ^= (b >> 13); \
  73                 a -= b; a -= c; a ^= (c >> 12); \
  74                 b -= c; b -= a; b ^= (a << 16); \
  75                 c -= a; c -= b; c ^= (b >> 5);  \
  76                 a -= b; a -= c; a ^= (c >> 3);  \
  77                 b -= c; b -= a; b ^= (a << 10); \
  78                 c -= a; c -= b; c ^= (b >> 15); \
  79         } while (0)
  80
  81 /*
  82  * hash function based on bridge_hash in if_bridge.c
  83  */
  84 static void
  85 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
  86     struct pf_poolhashkey *key, sa_family_t af)
  87 {
  88         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
  89
  90         switch (af) {
  91 #ifdef INET
  92         case AF_INET:
  93                 a += inaddr->addr32[0];
  94                 b += key->key32[1];
  95                 mix(a, b, c);
  96                 hash->addr32[0] = c + key->key32[2];
  97                 break;
  98 #endif /* INET */
  99 #ifdef INET6
 100         case AF_INET6:
 101                 a += inaddr->addr32[0];
 102                 b += inaddr->addr32[2];
 103                 mix(a, b, c);
 104                 hash->addr32[0] = c;
 105                 a += inaddr->addr32[1];
 106                 b += inaddr->addr32[3];
 107                 c += key->key32[1];
 108                 mix(a, b, c);
 109                 hash->addr32[1] = c;
 110                 a += inaddr->addr32[2];
 111                 b += inaddr->addr32[1];
 112                 c += key->key32[2];
 113                 mix(a, b, c);
 114                 hash->addr32[2] = c;
 115                 a += inaddr->addr32[3];
 116                 b += inaddr->addr32[0];
 117                 c += key->key32[3];
 118                 mix(a, b, c);
 119                 hash->addr32[3] = c;
 120                 break;
 121 #endif /* INET6 */
 122         }
 123 }
 124
 125 static struct pf_rule *
 126 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
 127     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
 128     struct pf_addr *daddr, uint16_t dport, int rs_num,
 129     struct pf_anchor_stackframe *anchor_stack)
 130 {
 131         struct pf_rule          *r, *rm = NULL;
 132         struct pf_ruleset       *ruleset = NULL;
 133         int                      tag = -1;
 134         int                      rtableid = -1;
 135         int                      asd = 0;
 136
 137         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
 138         while (r && rm == NULL) {
 139                 struct pf_rule_addr     *src = NULL, *dst = NULL;
 140                 struct pf_addr_wrap     *xdst = NULL;
 141
 142                 if (r->action == PF_BINAT && direction == PF_IN) {
 143                         src = &r->dst;
 144                         if (r->rpool.cur != NULL)
 145                                 xdst = &r->rpool.cur->addr;
 146                 } else {
 147                         src = &r->src;
 148                         dst = &r->dst;
 149                 }
 150
 151                 r->evaluations++;
 152                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 153                         r = r->skip[PF_SKIP_IFP].ptr;
 154                 else if (r->direction && r->direction != direction)
 155                         r = r->skip[PF_SKIP_DIR].ptr;
 156                 else if (r->af && r->af != pd->af)
 157                         r = r->skip[PF_SKIP_AF].ptr;
 158                 else if (r->proto && r->proto != pd->proto)
 159                         r = r->skip[PF_SKIP_PROTO].ptr;
 160                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
 161                     src->neg, kif, M_GETFIB(m)))
 162                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
 163                             PF_SKIP_DST_ADDR].ptr;
 164                 else if (src->port_op && !pf_match_port(src->port_op,
 165                     src->port[0], src->port[1], sport))
 166                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
 167                             PF_SKIP_DST_PORT].ptr;
 168                 else if (dst != NULL &&
 169                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL,
 170                     M_GETFIB(m)))
 171                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 172                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
 173                     0, NULL, M_GETFIB(m)))
 174                         r = TAILQ_NEXT(r, entries);
 175                 else if (dst != NULL && dst->port_op &&
 176                     !pf_match_port(dst->port_op, dst->port[0],
 177                     dst->port[1], dport))
 178                         r = r->skip[PF_SKIP_DST_PORT].ptr;
 179                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
 180                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
 181                         r = TAILQ_NEXT(r, entries);
 182                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
 183                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
 184                     off, pd->hdr.tcp), r->os_fingerprint)))
 185                         r = TAILQ_NEXT(r, entries);
 186                 else {
 187                         if (r->tag)
 188                                 tag = r->tag;
 189                         if (r->rtableid >= 0)
 190                                 rtableid = r->rtableid;
 191                         if (r->anchor == NULL) {
 192                                 rm = r;
 193                         } else
 194                                 pf_step_into_anchor(anchor_stack, &asd,
 195                                     &ruleset, rs_num, &r, NULL, NULL);
 196                 }
 197                 if (r == NULL)
 198                         pf_step_out_of_anchor(anchor_stack, &asd, &ruleset,
 199                             rs_num, &r, NULL, NULL);
 200         }
 201
 202         if (tag > 0 && pf_tag_packet(m, pd, tag))
 203                 return (NULL);
 204         if (rtableid >= 0)
 205                 M_SETFIB(m, rtableid);
 206
 207         if (rm != NULL && (rm->action == PF_NONAT ||
 208             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
 209                 return (NULL);
 210         return (rm);
 211 }
 212
 213 static int
 214 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
 215     struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
 216     uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low,
 217     uint16_t high, struct pf_src_node **sn)
 218 {
 219         struct pf_state_key_cmp key;
 220         struct pf_addr          init_addr;
 221
 222         bzero(&init_addr, sizeof(init_addr));
 223         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 224                 return (1);
 225
 226         if (proto == IPPROTO_ICMP) {
 227                 low = 1;
 228                 high = 65535;
 229         }
 230
 231         bzero(&key, sizeof(key));
 232         key.af = af;
 233         key.proto = proto;
 234         key.port[0] = dport;
 235         PF_ACPY(&key.addr[0], daddr, key.af);
 236
 237         do {
 238                 PF_ACPY(&key.addr[1], naddr, key.af);
 239
 240                 /*
 241                  * port search; start random, step;
 242                  * similar 2 portloop in in_pcbbind
 243                  */
 244                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
 245                     proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
 246                         /*
 247                          * XXX bug: icmp states don't use the id on both sides.
 248                          * (traceroute -I through nat)
 249                          */
 250                         key.port[1] = sport;
 251                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 252                                 *nport = sport;
 253                                 return (0);
 254                         }
 255                 } else if (low == high) {
 256                         key.port[1] = htons(low);
 257                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 258                                 *nport = htons(low);
 259                                 return (0);
 260                         }
 261                 } else {
 262                         uint32_t tmp;
 263                         uint16_t cut;
 264
 265                         if (low > high) {
 266                                 tmp = low;
 267                                 low = high;
 268                                 high = tmp;
 269                         }
 270                         /* low < high */
 271                         cut = arc4random() % (1 + high - low) + low;
 272                         /* low <= cut <= high */
 273                         for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
 274                                 key.port[1] = htons(tmp);
 275                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 276                                     NULL) {
 277                                         *nport = htons(tmp);
 278                                         return (0);
 279                                 }
 280                         }
 281                         tmp = cut;
 282                         for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
 283                                 key.port[1] = htons(tmp);
 284                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 285                                     NULL) {
 286                                         *nport = htons(tmp);
 287                                         return (0);
 288                                 }
 289                         }
 290                 }
 291
 292                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
 293                 case PF_POOL_RANDOM:
 294                 case PF_POOL_ROUNDROBIN:
 295                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 296                                 return (1);
 297                         break;
 298                 case PF_POOL_NONE:
 299                 case PF_POOL_SRCHASH:
 300                 case PF_POOL_BITMASK:
 301                 default:
 302                         return (1);
 303                 }
 304         } while (! PF_AEQ(&init_addr, naddr, af) );
 305         return (1);                                     /* none available */
 306 }
 307
 308 int
 309 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
 310     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
 311 {
 312         struct pf_pool          *rpool = &r->rpool;
 313         struct pf_addr          *raddr = NULL, *rmask = NULL;
 314
 315         /* Try to find a src_node if none was given and this
 316            is a sticky-address rule. */
 317         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
 318             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
 319                 *sn = pf_find_src_node(saddr, r, af, 0);
 320
 321         /* If a src_node was found or explicitly given and it has a non-zero
 322            route address, use this address. A zeroed address is found if the
 323            src node was created just a moment ago in pf_create_state and it
 324            needs to be filled in with routing decision calculated here. */
 325         if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
 326                 PF_ACPY(naddr, &(*sn)->raddr, af);
 327                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 328                         printf("pf_map_addr: src tracking maps ");
 329                         pf_print_host(saddr, 0, af);
 330                         printf(" to ");
 331                         pf_print_host(naddr, 0, af);
 332                         printf("\n");
 333                 }
 334                 return (0);
 335         }
 336
 337         /* Find the route using chosen algorithm. Store the found route
 338            in src_node if it was given or found. */
 339         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
 340                 return (1);
 341         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 342                 switch (af) {
 343 #ifdef INET
 344                 case AF_INET:
 345                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
 346                             (rpool->opts & PF_POOL_TYPEMASK) !=
 347                             PF_POOL_ROUNDROBIN)
 348                                 return (1);
 349                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
 350                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
 351                         break;
 352 #endif /* INET */
 353 #ifdef INET6
 354                 case AF_INET6:
 355                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
 356                             (rpool->opts & PF_POOL_TYPEMASK) !=
 357                             PF_POOL_ROUNDROBIN)
 358                                 return (1);
 359                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
 360                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
 361                         break;
 362 #endif /* INET6 */
 363                 }
 364         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 365                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
 366                         return (1); /* unsupported */
 367         } else {
 368                 raddr = &rpool->cur->addr.v.a.addr;
 369                 rmask = &rpool->cur->addr.v.a.mask;
 370         }
 371
 372         switch (rpool->opts & PF_POOL_TYPEMASK) {
 373         case PF_POOL_NONE:
 374                 PF_ACPY(naddr, raddr, af);
 375                 break;
 376         case PF_POOL_BITMASK:
 377                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
 378                 break;
 379         case PF_POOL_RANDOM:
 380                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
 381                         switch (af) {
 382 #ifdef INET
 383                         case AF_INET:
 384                                 rpool->counter.addr32[0] = htonl(arc4random());
 385                                 break;
 386 #endif /* INET */
 387 #ifdef INET6
 388                         case AF_INET6:
 389                                 if (rmask->addr32[3] != 0xffffffff)
 390                                         rpool->counter.addr32[3] =
 391                                             htonl(arc4random());
 392                                 else
 393                                         break;
 394                                 if (rmask->addr32[2] != 0xffffffff)
 395                                         rpool->counter.addr32[2] =
 396                                             htonl(arc4random());
 397                                 else
 398                                         break;
 399                                 if (rmask->addr32[1] != 0xffffffff)
 400                                         rpool->counter.addr32[1] =
 401                                             htonl(arc4random());
 402                                 else
 403                                         break;
 404                                 if (rmask->addr32[0] != 0xffffffff)
 405                                         rpool->counter.addr32[0] =
 406                                             htonl(arc4random());
 407                                 break;
 408 #endif /* INET6 */
 409                         }
 410                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 411                         PF_ACPY(init_addr, naddr, af);
 412
 413                 } else {
 414                         PF_AINC(&rpool->counter, af);
 415                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 416                 }
 417                 break;
 418         case PF_POOL_SRCHASH:
 419             {
 420                 unsigned char hash[16];
 421
 422                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
 423                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
 424                 break;
 425             }
 426         case PF_POOL_ROUNDROBIN:
 427             {
 428                 struct pf_pooladdr *acur = rpool->cur;
 429
 430                 /*
 431                  * XXXGL: in the round-robin case we need to store
 432                  * the round-robin machine state in the rule, thus
 433                  * forwarding thread needs to modify rule.
 434                  *
 435                  * This is done w/o locking, because performance is assumed
 436                  * more important than round-robin precision.
 437                  *
 438                  * In the simpliest case we just update the "rpool->cur"
 439                  * pointer. However, if pool contains tables or dynamic
 440                  * addresses, then "tblidx" is also used to store machine
 441                  * state. Since "tblidx" is int, concurrent access to it can't
 442                  * lead to inconsistence, only to lost of precision.
 443                  *
 444                  * Things get worse, if table contains not hosts, but
 445                  * prefixes. In this case counter also stores machine state,
 446                  * and for IPv6 address, counter can't be updated atomically.
 447                  * Probably, using round-robin on a table containing IPv6
 448                  * prefixes (or even IPv4) would cause a panic.
 449                  */
 450
 451                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 452                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
 453                             &rpool->tblidx, &rpool->counter, af))
 454                                 goto get_addr;
 455                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 456                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 457                             &rpool->tblidx, &rpool->counter, af))
 458                                 goto get_addr;
 459                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
 460                         goto get_addr;
 461
 462         try_next:
 463                 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
 464                         rpool->cur = TAILQ_FIRST(&rpool->list);
 465                 else
 466                         rpool->cur = TAILQ_NEXT(rpool->cur, entries);
 467                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 468                         rpool->tblidx = -1;
 469                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
 470                             &rpool->tblidx, &rpool->counter, af)) {
 471                                 /* table contains no address of type 'af' */
 472                                 if (rpool->cur != acur)
 473                                         goto try_next;
 474                                 return (1);
 475                         }
 476                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 477                         rpool->tblidx = -1;
 478                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 479                             &rpool->tblidx, &rpool->counter, af)) {
 480                                 /* table contains no address of type 'af' */
 481                                 if (rpool->cur != acur)
 482                                         goto try_next;
 483                                 return (1);
 484                         }
 485                 } else {
 486                         raddr = &rpool->cur->addr.v.a.addr;
 487                         rmask = &rpool->cur->addr.v.a.mask;
 488                         PF_ACPY(&rpool->counter, raddr, af);
 489                 }
 490
 491         get_addr:
 492                 PF_ACPY(naddr, &rpool->counter, af);
 493                 if (init_addr != NULL && PF_AZERO(init_addr, af))
 494                         PF_ACPY(init_addr, naddr, af);
 495                 PF_AINC(&rpool->counter, af);
 496                 break;
 497             }
 498         }
 499         if (*sn != NULL)
 500                 PF_ACPY(&(*sn)->raddr, naddr, af);
 501
 502         if (V_pf_status.debug >= PF_DEBUG_MISC &&
 503             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 504                 printf("pf_map_addr: selected address ");
 505                 pf_print_host(naddr, 0, af);
 506                 printf("\n");
 507         }
 508
 509         return (0);
 510 }
 511
 512 struct pf_rule *
 513 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
 514     struct pfi_kif *kif, struct pf_src_node **sn,
 515     struct pf_state_key **skp, struct pf_state_key **nkp,
 516     struct pf_addr *saddr, struct pf_addr *daddr,
 517     uint16_t sport, uint16_t dport, struct pf_anchor_stackframe *anchor_stack)
 518 {
 519         struct pf_rule  *r = NULL;
 520         struct pf_addr  *naddr;
 521         uint16_t        *nport;
 522
 523         PF_RULES_RASSERT();
 524         KASSERT(*skp == NULL, ("*skp not NULL"));
 525         KASSERT(*nkp == NULL, ("*nkp not NULL"));
 526
 527         if (direction == PF_OUT) {
 528                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 529                     sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
 530                 if (r == NULL)
 531                         r = pf_match_translation(pd, m, off, direction, kif,
 532                             saddr, sport, daddr, dport, PF_RULESET_NAT,
 533                             anchor_stack);
 534         } else {
 535                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 536                     sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
 537                 if (r == NULL)
 538                         r = pf_match_translation(pd, m, off, direction, kif,
 539                             saddr, sport, daddr, dport, PF_RULESET_BINAT,
 540                             anchor_stack);
 541         }
 542
 543         if (r == NULL)
 544                 return (NULL);
 545
 546         switch (r->action) {
 547         case PF_NONAT:
 548         case PF_NOBINAT:
 549         case PF_NORDR:
 550                 return (NULL);
 551         }
 552
 553         *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
 554         if (*skp == NULL)
 555                 return (NULL);
 556         *nkp = pf_state_key_clone(*skp);
 557         if (*nkp == NULL) {
 558                 uma_zfree(V_pf_state_key_z, *skp);
 559                 *skp = NULL;
 560                 return (NULL);
 561         }
 562
 563         /* XXX We only modify one side for now. */
 564         naddr = &(*nkp)->addr[1];
 565         nport = &(*nkp)->port[1];
 566
 567         switch (r->action) {
 568         case PF_NAT:
 569                 if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, daddr,
 570                     dport, naddr, nport, r->rpool.proxy_port[0],
 571                     r->rpool.proxy_port[1], sn)) {
 572                         DPFPRINTF(PF_DEBUG_MISC,
 573                             ("pf: NAT proxy port allocation (%u-%u) failed\n",
 574                             r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
 575                         goto notrans;
 576                 }
 577                 break;
 578         case PF_BINAT:
 579                 switch (direction) {
 580                 case PF_OUT:
 581                         if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
 582                                 switch (pd->af) {
 583 #ifdef INET
 584                                 case AF_INET:
 585                                         if (r->rpool.cur->addr.p.dyn->
 586                                             pfid_acnt4 < 1)
 587                                                 goto notrans;
 588                                         PF_POOLMASK(naddr,
 589                                             &r->rpool.cur->addr.p.dyn->
 590                                             pfid_addr4,
 591                                             &r->rpool.cur->addr.p.dyn->
 592                                             pfid_mask4, saddr, AF_INET);
 593                                         break;
 594 #endif /* INET */
 595 #ifdef INET6
 596                                 case AF_INET6:
 597                                         if (r->rpool.cur->addr.p.dyn->
 598                                             pfid_acnt6 < 1)
 599                                                 goto notrans;
 600                                         PF_POOLMASK(naddr,
 601                                             &r->rpool.cur->addr.p.dyn->
 602                                             pfid_addr6,
 603                                             &r->rpool.cur->addr.p.dyn->
 604                                             pfid_mask6, saddr, AF_INET6);
 605                                         break;
 606 #endif /* INET6 */
 607                                 }
 608                         } else
 609                                 PF_POOLMASK(naddr,
 610                                     &r->rpool.cur->addr.v.a.addr,
 611                                     &r->rpool.cur->addr.v.a.mask, saddr,
 612                                     pd->af);
 613                         break;
 614                 case PF_IN:
 615                         if (r->src.addr.type == PF_ADDR_DYNIFTL) {
 616                                 switch (pd->af) {
 617 #ifdef INET
 618                                 case AF_INET:
 619                                         if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
 620                                                 goto notrans;
 621                                         PF_POOLMASK(naddr,
 622                                             &r->src.addr.p.dyn->pfid_addr4,
 623                                             &r->src.addr.p.dyn->pfid_mask4,
 624                                             daddr, AF_INET);
 625                                         break;
 626 #endif /* INET */
 627 #ifdef INET6
 628                                 case AF_INET6:
 629                                         if (r->src.addr.p.dyn->pfid_acnt6 < 1)
 630                                                 goto notrans;
 631                                         PF_POOLMASK(naddr,
 632                                             &r->src.addr.p.dyn->pfid_addr6,
 633                                             &r->src.addr.p.dyn->pfid_mask6,
 634                                             daddr, AF_INET6);
 635                                         break;
 636 #endif /* INET6 */
 637                                 }
 638                         } else
 639                                 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
 640                                     &r->src.addr.v.a.mask, daddr, pd->af);
 641                         break;
 642                 }
 643                 break;
 644         case PF_RDR: {
 645                 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
 646                         goto notrans;
 647                 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
 648                         PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
 649                             daddr, pd->af);
 650
 651                 if (r->rpool.proxy_port[1]) {
 652                         uint32_t        tmp_nport;
 653
 654                         tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
 655                             (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
 656                             1)) + r->rpool.proxy_port[0];
 657
 658                         /* Wrap around if necessary. */
 659                         if (tmp_nport > 65535)
 660                                 tmp_nport -= 65535;
 661                         *nport = htons((uint16_t)tmp_nport);
 662                 } else if (r->rpool.proxy_port[0])
 663                         *nport = htons(r->rpool.proxy_port[0]);
 664                 break;
 665         }
 666         default:
 667                 panic("%s: unknown action %u", __func__, r->action);
 668         }
 669
 670         /* Return success only if translation really happened. */
 671         if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
 672                 return (r);
 673
 674 notrans:
 675         uma_zfree(V_pf_state_key_z, *nkp);
 676         uma_zfree(V_pf_state_key_z, *skp);
 677         *skp = *nkp = NULL;
 678         *sn = NULL;
 679
 680         return (NULL);
 681 }