sys/netpfil/pf/pf_lb.c

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