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