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