sys/netpfil/pf/pf_lb.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2001 Daniel Hartmeier
   5  * Copyright (c) 2002 - 2008 Henning Brauer
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  *    - Redistributions of source code must retain the above copyright
  13  *      notice, this list of conditions and the following disclaimer.
  14  *    - Redistributions in binary form must reproduce the above
  15  *      copyright notice, this list of conditions and the following
  16  *      disclaimer in the documentation and/or other materials provided
  17  *      with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  27  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  29  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * Effort sponsored in part by the Defense Advanced Research Projects
  33  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  34  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
  35  *
  36  *      $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include "opt_pf.h"
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/lock.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/rwlock.h>
  50 #include <sys/socket.h>
  51 #include <sys/sysctl.h>
  52
  53 #include <net/if.h>
  54 #include <net/vnet.h>
  55 #include <net/pfvar.h>
  56 #include <net/if_pflog.h>
  57
  58 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
  59
  60 static void              pf_hash(struct pf_addr *, struct pf_addr *,
  61                             struct pf_poolhashkey *, sa_family_t);
  62 static struct pf_rule   *pf_match_translation(struct pf_pdesc *, struct mbuf *,
  63                             int, int, struct pfi_kif *,
  64                             struct pf_addr *, u_int16_t, struct pf_addr *,
  65                             uint16_t, int, struct pf_anchor_stackframe *);
  66 static int pf_get_sport(sa_family_t, uint8_t, struct pf_rule *,
  67     struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
  68     uint16_t *, uint16_t, uint16_t, struct pf_src_node **);
  69
  70 #define mix(a,b,c) \
  71         do {                                    \
  72                 a -= b; a -= c; a ^= (c >> 13); \
  73                 b -= c; b -= a; b ^= (a << 8);  \
  74                 c -= a; c -= b; c ^= (b >> 13); \
  75                 a -= b; a -= c; a ^= (c >> 12); \
  76                 b -= c; b -= a; b ^= (a << 16); \
  77                 c -= a; c -= b; c ^= (b >> 5);  \
  78                 a -= b; a -= c; a ^= (c >> 3);  \
  79                 b -= c; b -= a; b ^= (a << 10); \
  80                 c -= a; c -= b; c ^= (b >> 15); \
  81         } while (0)
  82
  83 /*
  84  * hash function based on bridge_hash in if_bridge.c
  85  */
  86 static void
  87 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
  88     struct pf_poolhashkey *key, sa_family_t af)
  89 {
  90         u_int32_t       a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
  91
  92         switch (af) {
  93 #ifdef INET
  94         case AF_INET:
  95                 a += inaddr->addr32[0];
  96                 b += key->key32[1];
  97                 mix(a, b, c);
  98                 hash->addr32[0] = c + key->key32[2];
  99                 break;
 100 #endif /* INET */
 101 #ifdef INET6
 102         case AF_INET6:
 103                 a += inaddr->addr32[0];
 104                 b += inaddr->addr32[2];
 105                 mix(a, b, c);
 106                 hash->addr32[0] = c;
 107                 a += inaddr->addr32[1];
 108                 b += inaddr->addr32[3];
 109                 c += key->key32[1];
 110                 mix(a, b, c);
 111                 hash->addr32[1] = c;
 112                 a += inaddr->addr32[2];
 113                 b += inaddr->addr32[1];
 114                 c += key->key32[2];
 115                 mix(a, b, c);
 116                 hash->addr32[2] = c;
 117                 a += inaddr->addr32[3];
 118                 b += inaddr->addr32[0];
 119                 c += key->key32[3];
 120                 mix(a, b, c);
 121                 hash->addr32[3] = c;
 122                 break;
 123 #endif /* INET6 */
 124         }
 125 }
 126
 127 static struct pf_rule *
 128 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
 129     int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
 130     struct pf_addr *daddr, uint16_t dport, int rs_num,
 131     struct pf_anchor_stackframe *anchor_stack)
 132 {
 133         struct pf_rule          *r, *rm = NULL;
 134         struct pf_ruleset       *ruleset = NULL;
 135         int                      tag = -1;
 136         int                      rtableid = -1;
 137         int                      asd = 0;
 138
 139         r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
 140         while (r && rm == NULL) {
 141                 struct pf_rule_addr     *src = NULL, *dst = NULL;
 142                 struct pf_addr_wrap     *xdst = NULL;
 143
 144                 if (r->action == PF_BINAT && direction == PF_IN) {
 145                         src = &r->dst;
 146                         if (r->rpool.cur != NULL)
 147                                 xdst = &r->rpool.cur->addr;
 148                 } else {
 149                         src = &r->src;
 150                         dst = &r->dst;
 151                 }
 152
 153                 r->evaluations++;
 154                 if (pfi_kif_match(r->kif, kif) == r->ifnot)
 155                         r = r->skip[PF_SKIP_IFP].ptr;
 156                 else if (r->direction && r->direction != direction)
 157                         r = r->skip[PF_SKIP_DIR].ptr;
 158                 else if (r->af && r->af != pd->af)
 159                         r = r->skip[PF_SKIP_AF].ptr;
 160                 else if (r->proto && r->proto != pd->proto)
 161                         r = r->skip[PF_SKIP_PROTO].ptr;
 162                 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
 163                     src->neg, kif, M_GETFIB(m)))
 164                         r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
 165                             PF_SKIP_DST_ADDR].ptr;
 166                 else if (src->port_op && !pf_match_port(src->port_op,
 167                     src->port[0], src->port[1], sport))
 168                         r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
 169                             PF_SKIP_DST_PORT].ptr;
 170                 else if (dst != NULL &&
 171                     PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL,
 172                     M_GETFIB(m)))
 173                         r = r->skip[PF_SKIP_DST_ADDR].ptr;
 174                 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
 175                     0, NULL, M_GETFIB(m)))
 176                         r = TAILQ_NEXT(r, entries);
 177                 else if (dst != NULL && dst->port_op &&
 178                     !pf_match_port(dst->port_op, dst->port[0],
 179                     dst->port[1], dport))
 180                         r = r->skip[PF_SKIP_DST_PORT].ptr;
 181                 else if (r->match_tag && !pf_match_tag(m, r, &tag,
 182                     pd->pf_mtag ? pd->pf_mtag->tag : 0))
 183                         r = TAILQ_NEXT(r, entries);
 184                 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
 185                     IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
 186                     off, pd->hdr.tcp), r->os_fingerprint)))
 187                         r = TAILQ_NEXT(r, entries);
 188                 else {
 189                         if (r->tag)
 190                                 tag = r->tag;
 191                         if (r->rtableid >= 0)
 192                                 rtableid = r->rtableid;
 193                         if (r->anchor == NULL) {
 194                                 rm = r;
 195                         } else
 196                                 pf_step_into_anchor(anchor_stack, &asd,
 197                                     &ruleset, rs_num, &r, NULL, NULL);
 198                 }
 199                 if (r == NULL)
 200                         pf_step_out_of_anchor(anchor_stack, &asd, &ruleset,
 201                             rs_num, &r, NULL, NULL);
 202         }
 203
 204         if (tag > 0 && pf_tag_packet(m, pd, tag))
 205                 return (NULL);
 206         if (rtableid >= 0)
 207                 M_SETFIB(m, rtableid);
 208
 209         if (rm != NULL && (rm->action == PF_NONAT ||
 210             rm->action == PF_NORDR || rm->action == PF_NOBINAT))
 211                 return (NULL);
 212         return (rm);
 213 }
 214
 215 static int
 216 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
 217     struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
 218     uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low,
 219     uint16_t high, struct pf_src_node **sn)
 220 {
 221         struct pf_state_key_cmp key;
 222         struct pf_addr          init_addr;
 223
 224         bzero(&init_addr, sizeof(init_addr));
 225         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 226                 return (1);
 227
 228         if (proto == IPPROTO_ICMP) {
 229                 low = 1;
 230                 high = 65535;
 231         }
 232
 233         bzero(&key, sizeof(key));
 234         key.af = af;
 235         key.proto = proto;
 236         key.port[0] = dport;
 237         PF_ACPY(&key.addr[0], daddr, key.af);
 238
 239         do {
 240                 PF_ACPY(&key.addr[1], naddr, key.af);
 241
 242                 /*
 243                  * port search; start random, step;
 244                  * similar 2 portloop in in_pcbbind
 245                  */
 246                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
 247                     proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
 248                         /*
 249                          * XXX bug: icmp states don't use the id on both sides.
 250                          * (traceroute -I through nat)
 251                          */
 252                         key.port[1] = sport;
 253                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 254                                 *nport = sport;
 255                                 return (0);
 256                         }
 257                 } else if (low == high) {
 258                         key.port[1] = htons(low);
 259                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 260                                 *nport = htons(low);
 261                                 return (0);
 262                         }
 263                 } else {
 264                         uint32_t tmp;
 265                         uint16_t cut;
 266
 267                         if (low > high) {
 268                                 tmp = low;
 269                                 low = high;
 270                                 high = tmp;
 271                         }
 272                         /* low < high */
 273                         cut = arc4random() % (1 + high - low) + low;
 274                         /* low <= cut <= high */
 275                         for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
 276                                 key.port[1] = htons(tmp);
 277                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 278                                     NULL) {
 279                                         *nport = htons(tmp);
 280                                         return (0);
 281                                 }
 282                         }
 283                         tmp = cut;
 284                         for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
 285                                 key.port[1] = htons(tmp);
 286                                 if (pf_find_state_all(&key, PF_IN, NULL) ==
 287                                     NULL) {
 288                                         *nport = htons(tmp);
 289                                         return (0);
 290                                 }
 291                         }
 292                 }
 293
 294                 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
 295                 case PF_POOL_RANDOM:
 296                 case PF_POOL_ROUNDROBIN:
 297                         if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 298                                 return (1);
 299                         break;
 300                 case PF_POOL_NONE:
 301                 case PF_POOL_SRCHASH:
 302                 case PF_POOL_BITMASK:
 303                 default:
 304                         return (1);
 305                 }
 306         } while (! PF_AEQ(&init_addr, naddr, af) );
 307         return (1);                                     /* none available */
 308 }
 309
 310 int
 311 pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
 312     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
 313 {
 314         struct pf_pool          *rpool = &r->rpool;
 315         struct pf_addr          *raddr = NULL, *rmask = NULL;
 316
 317         /* Try to find a src_node if none was given and this
 318            is a sticky-address rule. */
 319         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
 320             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
 321                 *sn = pf_find_src_node(saddr, r, af, 0);
 322
 323         /* If a src_node was found or explicitly given and it has a non-zero
 324            route address, use this address. A zeroed address is found if the
 325            src node was created just a moment ago in pf_create_state and it
 326            needs to be filled in with routing decision calculated here. */
 327         if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
 328                 PF_ACPY(naddr, &(*sn)->raddr, af);
 329                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 330                         printf("pf_map_addr: src tracking maps ");
 331                         pf_print_host(saddr, 0, af);
 332                         printf(" to ");
 333                         pf_print_host(naddr, 0, af);
 334                         printf("\n");
 335                 }
 336                 return (0);
 337         }
 338
 339         /* Find the route using chosen algorithm. Store the found route
 340            in src_node if it was given or found. */
 341         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
 342                 return (1);
 343         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 344                 switch (af) {
 345 #ifdef INET
 346                 case AF_INET:
 347                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
 348                             (rpool->opts & PF_POOL_TYPEMASK) !=
 349                             PF_POOL_ROUNDROBIN)
 350                                 return (1);
 351                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
 352                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
 353                         break;
 354 #endif /* INET */
 355 #ifdef INET6
 356                 case AF_INET6:
 357                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
 358                             (rpool->opts & PF_POOL_TYPEMASK) !=
 359                             PF_POOL_ROUNDROBIN)
 360                                 return (1);
 361                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
 362                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
 363                         break;
 364 #endif /* INET6 */
 365                 }
 366         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 367                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
 368                         return (1); /* unsupported */
 369         } else {
 370                 raddr = &rpool->cur->addr.v.a.addr;
 371                 rmask = &rpool->cur->addr.v.a.mask;
 372         }
 373
 374         switch (rpool->opts & PF_POOL_TYPEMASK) {
 375         case PF_POOL_NONE:
 376                 PF_ACPY(naddr, raddr, af);
 377                 break;
 378         case PF_POOL_BITMASK:
 379                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
 380                 break;
 381         case PF_POOL_RANDOM:
 382                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
 383                         switch (af) {
 384 #ifdef INET
 385                         case AF_INET:
 386                                 rpool->counter.addr32[0] = htonl(arc4random());
 387                                 break;
 388 #endif /* INET */
 389 #ifdef INET6
 390                         case AF_INET6:
 391                                 if (rmask->addr32[3] != 0xffffffff)
 392                                         rpool->counter.addr32[3] =
 393                                             htonl(arc4random());
 394                                 else
 395                                         break;
 396                                 if (rmask->addr32[2] != 0xffffffff)
 397                                         rpool->counter.addr32[2] =
 398                                             htonl(arc4random());
 399                                 else
 400                                         break;
 401                                 if (rmask->addr32[1] != 0xffffffff)
 402                                         rpool->counter.addr32[1] =
 403                                             htonl(arc4random());
 404                                 else
 405                                         break;
 406                                 if (rmask->addr32[0] != 0xffffffff)
 407                                         rpool->counter.addr32[0] =
 408                                             htonl(arc4random());
 409                                 break;
 410 #endif /* INET6 */
 411                         }
 412                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 413                         PF_ACPY(init_addr, naddr, af);
 414
 415                 } else {
 416                         PF_AINC(&rpool->counter, af);
 417                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 418                 }
 419                 break;
 420         case PF_POOL_SRCHASH:
 421             {
 422                 unsigned char hash[16];
 423
 424                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
 425                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
 426                 break;
 427             }
 428         case PF_POOL_ROUNDROBIN:
 429             {
 430                 struct pf_pooladdr *acur = rpool->cur;
 431
 432                 /*
 433                  * XXXGL: in the round-robin case we need to store
 434                  * the round-robin machine state in the rule, thus
 435                  * forwarding thread needs to modify rule.
 436                  *
 437                  * This is done w/o locking, because performance is assumed
 438                  * more important than round-robin precision.
 439                  *
 440                  * In the simpliest case we just update the "rpool->cur"
 441                  * pointer. However, if pool contains tables or dynamic
 442                  * addresses, then "tblidx" is also used to store machine
 443                  * state. Since "tblidx" is int, concurrent access to it can't
 444                  * lead to inconsistence, only to lost of precision.
 445                  *
 446                  * Things get worse, if table contains not hosts, but
 447                  * prefixes. In this case counter also stores machine state,
 448                  * and for IPv6 address, counter can't be updated atomically.
 449                  * Probably, using round-robin on a table containing IPv6
 450                  * prefixes (or even IPv4) would cause a panic.
 451                  */
 452
 453                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 454                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
 455                             &rpool->tblidx, &rpool->counter, af))
 456                                 goto get_addr;
 457                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 458                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 459                             &rpool->tblidx, &rpool->counter, af))
 460                                 goto get_addr;
 461                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
 462                         goto get_addr;
 463
 464         try_next:
 465                 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
 466                         rpool->cur = TAILQ_FIRST(&rpool->list);
 467                 else
 468                         rpool->cur = TAILQ_NEXT(rpool->cur, entries);
 469                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 470                         rpool->tblidx = -1;
 471                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
 472                             &rpool->tblidx, &rpool->counter, af)) {
 473                                 /* table contains no address of type 'af' */
 474                                 if (rpool->cur != acur)
 475                                         goto try_next;
 476                                 return (1);
 477                         }
 478                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 479                         rpool->tblidx = -1;
 480                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 481                             &rpool->tblidx, &rpool->counter, af)) {
 482                                 /* table contains no address of type 'af' */
 483                                 if (rpool->cur != acur)
 484                                         goto try_next;
 485                                 return (1);
 486                         }
 487                 } else {
 488                         raddr = &rpool->cur->addr.v.a.addr;
 489                         rmask = &rpool->cur->addr.v.a.mask;
 490                         PF_ACPY(&rpool->counter, raddr, af);
 491                 }
 492
 493         get_addr:
 494                 PF_ACPY(naddr, &rpool->counter, af);
 495                 if (init_addr != NULL && PF_AZERO(init_addr, af))
 496                         PF_ACPY(init_addr, naddr, af);
 497                 PF_AINC(&rpool->counter, af);
 498                 break;
 499             }
 500         }
 501         if (*sn != NULL)
 502                 PF_ACPY(&(*sn)->raddr, naddr, af);
 503
 504         if (V_pf_status.debug >= PF_DEBUG_MISC &&
 505             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 506                 printf("pf_map_addr: selected address ");
 507                 pf_print_host(naddr, 0, af);
 508                 printf("\n");
 509         }
 510
 511         return (0);
 512 }
 513
 514 struct pf_rule *
 515 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
 516     struct pfi_kif *kif, struct pf_src_node **sn,
 517     struct pf_state_key **skp, struct pf_state_key **nkp,
 518     struct pf_addr *saddr, struct pf_addr *daddr,
 519     uint16_t sport, uint16_t dport, struct pf_anchor_stackframe *anchor_stack)
 520 {
 521         struct pf_rule  *r = NULL;
 522         struct pf_addr  *naddr;
 523         uint16_t        *nport;
 524
 525         PF_RULES_RASSERT();
 526         KASSERT(*skp == NULL, ("*skp not NULL"));
 527         KASSERT(*nkp == NULL, ("*nkp not NULL"));
 528
 529         if (direction == PF_OUT) {
 530                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 531                     sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
 532                 if (r == NULL)
 533                         r = pf_match_translation(pd, m, off, direction, kif,
 534                             saddr, sport, daddr, dport, PF_RULESET_NAT,
 535                             anchor_stack);
 536         } else {
 537                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 538                     sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
 539                 if (r == NULL)
 540                         r = pf_match_translation(pd, m, off, direction, kif,
 541                             saddr, sport, daddr, dport, PF_RULESET_BINAT,
 542                             anchor_stack);
 543         }
 544
 545         if (r == NULL)
 546                 return (NULL);
 547
 548         switch (r->action) {
 549         case PF_NONAT:
 550         case PF_NOBINAT:
 551         case PF_NORDR:
 552                 return (NULL);
 553         }
 554
 555         *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
 556         if (*skp == NULL)
 557                 return (NULL);
 558         *nkp = pf_state_key_clone(*skp);
 559         if (*nkp == NULL) {
 560                 uma_zfree(V_pf_state_key_z, *skp);
 561                 *skp = NULL;
 562                 return (NULL);
 563         }
 564
 565         /* XXX We only modify one side for now. */
 566         naddr = &(*nkp)->addr[1];
 567         nport = &(*nkp)->port[1];
 568
 569         switch (r->action) {
 570         case PF_NAT:
 571                 if (pf_get_sport(pd->af, pd->proto, r, saddr, sport, daddr,
 572                     dport, naddr, nport, r->rpool.proxy_port[0],
 573                     r->rpool.proxy_port[1], sn)) {
 574                         DPFPRINTF(PF_DEBUG_MISC,
 575                             ("pf: NAT proxy port allocation (%u-%u) failed\n",
 576                             r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
 577                         goto notrans;
 578                 }
 579                 break;
 580         case PF_BINAT:
 581                 switch (direction) {
 582                 case PF_OUT:
 583                         if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
 584                                 switch (pd->af) {
 585 #ifdef INET
 586                                 case AF_INET:
 587                                         if (r->rpool.cur->addr.p.dyn->
 588                                             pfid_acnt4 < 1)
 589                                                 goto notrans;
 590                                         PF_POOLMASK(naddr,
 591                                             &r->rpool.cur->addr.p.dyn->
 592                                             pfid_addr4,
 593                                             &r->rpool.cur->addr.p.dyn->
 594                                             pfid_mask4, saddr, AF_INET);
 595                                         break;
 596 #endif /* INET */
 597 #ifdef INET6
 598                                 case AF_INET6:
 599                                         if (r->rpool.cur->addr.p.dyn->
 600                                             pfid_acnt6 < 1)
 601                                                 goto notrans;
 602                                         PF_POOLMASK(naddr,
 603                                             &r->rpool.cur->addr.p.dyn->
 604                                             pfid_addr6,
 605                                             &r->rpool.cur->addr.p.dyn->
 606                                             pfid_mask6, saddr, AF_INET6);
 607                                         break;
 608 #endif /* INET6 */
 609                                 }
 610                         } else
 611                                 PF_POOLMASK(naddr,
 612                                     &r->rpool.cur->addr.v.a.addr,
 613                                     &r->rpool.cur->addr.v.a.mask, saddr,
 614                                     pd->af);
 615                         break;
 616                 case PF_IN:
 617                         if (r->src.addr.type == PF_ADDR_DYNIFTL) {
 618                                 switch (pd->af) {
 619 #ifdef INET
 620                                 case AF_INET:
 621                                         if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
 622                                                 goto notrans;
 623                                         PF_POOLMASK(naddr,
 624                                             &r->src.addr.p.dyn->pfid_addr4,
 625                                             &r->src.addr.p.dyn->pfid_mask4,
 626                                             daddr, AF_INET);
 627                                         break;
 628 #endif /* INET */
 629 #ifdef INET6
 630                                 case AF_INET6:
 631                                         if (r->src.addr.p.dyn->pfid_acnt6 < 1)
 632                                                 goto notrans;
 633                                         PF_POOLMASK(naddr,
 634                                             &r->src.addr.p.dyn->pfid_addr6,
 635                                             &r->src.addr.p.dyn->pfid_mask6,
 636                                             daddr, AF_INET6);
 637                                         break;
 638 #endif /* INET6 */
 639                                 }
 640                         } else
 641                                 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
 642                                     &r->src.addr.v.a.mask, daddr, pd->af);
 643                         break;
 644                 }
 645                 break;
 646         case PF_RDR: {
 647                 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
 648                         goto notrans;
 649                 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
 650                         PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
 651                             daddr, pd->af);
 652
 653                 if (r->rpool.proxy_port[1]) {
 654                         uint32_t        tmp_nport;
 655
 656                         tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
 657                             (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
 658                             1)) + r->rpool.proxy_port[0];
 659
 660                         /* Wrap around if necessary. */
 661                         if (tmp_nport > 65535)
 662                                 tmp_nport -= 65535;
 663                         *nport = htons((uint16_t)tmp_nport);
 664                 } else if (r->rpool.proxy_port[0])
 665                         *nport = htons(r->rpool.proxy_port[0]);
 666                 break;
 667         }
 668         default:
 669                 panic("%s: unknown action %u", __func__, r->action);
 670         }
 671
 672         /* Return success only if translation really happened. */
 673         if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
 674                 return (r);
 675
 676 notrans:
 677         uma_zfree(V_pf_state_key_z, *nkp);
 678         uma_zfree(V_pf_state_key_z, *skp);
 679         *skp = *nkp = NULL;
 680         *sn = NULL;
 681
 682         return (NULL);
 683 }