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_krule  *pf_match_translation(struct pf_pdesc *, struct mbuf *,
  62                             int, int, struct pfi_kkif *,
  63                             struct pf_addr *, u_int16_t, struct pf_addr *,
  64                             uint16_t, int, struct pf_kanchor_stackframe *);
  65 static int pf_get_sport(sa_family_t, uint8_t, struct pf_krule *,
  66     struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
  67     uint16_t *, uint16_t, uint16_t, struct pf_ksrc_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_krule *
 127 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
 128     int direction, struct pfi_kkif *kif, struct pf_addr *saddr, u_int16_t sport,
 129     struct pf_addr *daddr, uint16_t dport, int rs_num,
 130     struct pf_kanchor_stackframe *anchor_stack)
 131 {
 132         struct pf_krule         *r, *rm = NULL;
 133         struct pf_kruleset      *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                 counter_u64_add(r->evaluations, 1);
 153                 if (pfi_kkif_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_krule *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_ksrc_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         bzero(&key, sizeof(key));
 228         key.af = af;
 229         key.proto = proto;
 230         key.port[0] = dport;
 231         PF_ACPY(&key.addr[0], daddr, key.af);
 232
 233         do {
 234                 PF_ACPY(&key.addr[1], naddr, key.af);
 235
 236                 /*
 237                  * port search; start random, step;
 238                  * similar 2 portloop in in_pcbbind
 239                  */
 240                 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
 241                     proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
 242                         /*
 243                          * XXX bug: icmp states don't use the id on both sides.
 244                          * (traceroute -I through nat)
 245                          */
 246                         key.port[1] = sport;
 247                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 248                                 *nport = sport;
 249                                 return (0);
 250                         }
 251                 } else if (low == high) {
 252                         key.port[1] = htons(low);
 253                         if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
 254                                 *nport = htons(low);
 255                                 return (0);
 256                         }
 257                 } else {
 258                         uint32_t tmp;
 259                         uint16_t cut;
 260
 261                         if (low > high) {
 262                                 tmp = low;
 263                                 low = high;
 264                                 high = tmp;
 265                         }
 266                         /* low < high */
 267                         cut = arc4random() % (1 + high - low) + low;
 268                         /* low <= cut <= high */
 269                         for (tmp = cut; tmp <= high && tmp <= 0xffff; ++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                         tmp = cut;
 278                         for (tmp -= 1; tmp >= low && tmp <= 0xffff; --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 static int
 305 pf_get_mape_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r,
 306     struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
 307     uint16_t dport, struct pf_addr *naddr, uint16_t *nport,
 308     struct pf_ksrc_node **sn)
 309 {
 310         uint16_t psmask, low, highmask;
 311         uint16_t i, ahigh, cut;
 312         int ashift, psidshift;
 313
 314         ashift = 16 - r->rpool.mape.offset;
 315         psidshift = ashift - r->rpool.mape.psidlen;
 316         psmask = r->rpool.mape.psid & ((1U << r->rpool.mape.psidlen) - 1);
 317         psmask = psmask << psidshift;
 318         highmask = (1U << psidshift) - 1;
 319
 320         ahigh = (1U << r->rpool.mape.offset) - 1;
 321         cut = arc4random() & ahigh;
 322         if (cut == 0)
 323                 cut = 1;
 324
 325         for (i = cut; i <= ahigh; i++) {
 326                 low = (i << ashift) | psmask;
 327                 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport,
 328                     naddr, nport, low, low | highmask, sn))
 329                         return (0);
 330         }
 331         for (i = cut - 1; i > 0; i--) {
 332                 low = (i << ashift) | psmask;
 333                 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport,
 334                     naddr, nport, low, low | highmask, sn))
 335                         return (0);
 336         }
 337         return (1);
 338 }
 339
 340 int
 341 pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr,
 342     struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_ksrc_node **sn)
 343 {
 344         struct pf_kpool         *rpool = &r->rpool;
 345         struct pf_addr          *raddr = NULL, *rmask = NULL;
 346
 347         /* Try to find a src_node if none was given and this
 348            is a sticky-address rule. */
 349         if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
 350             (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
 351                 *sn = pf_find_src_node(saddr, r, af, 0);
 352
 353         /* If a src_node was found or explicitly given and it has a non-zero
 354            route address, use this address. A zeroed address is found if the
 355            src node was created just a moment ago in pf_create_state and it
 356            needs to be filled in with routing decision calculated here. */
 357         if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
 358                 /* If the supplied address is the same as the current one we've
 359                  * been asked before, so tell the caller that there's no other
 360                  * address to be had. */
 361                 if (PF_AEQ(naddr, &(*sn)->raddr, af))
 362                         return (1);
 363
 364                 PF_ACPY(naddr, &(*sn)->raddr, af);
 365                 if (V_pf_status.debug >= PF_DEBUG_MISC) {
 366                         printf("pf_map_addr: src tracking maps ");
 367                         pf_print_host(saddr, 0, af);
 368                         printf(" to ");
 369                         pf_print_host(naddr, 0, af);
 370                         printf("\n");
 371                 }
 372                 return (0);
 373         }
 374
 375         /* Find the route using chosen algorithm. Store the found route
 376            in src_node if it was given or found. */
 377         if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
 378                 return (1);
 379         if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 380                 switch (af) {
 381 #ifdef INET
 382                 case AF_INET:
 383                         if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
 384                             (rpool->opts & PF_POOL_TYPEMASK) !=
 385                             PF_POOL_ROUNDROBIN)
 386                                 return (1);
 387                          raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
 388                          rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
 389                         break;
 390 #endif /* INET */
 391 #ifdef INET6
 392                 case AF_INET6:
 393                         if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
 394                             (rpool->opts & PF_POOL_TYPEMASK) !=
 395                             PF_POOL_ROUNDROBIN)
 396                                 return (1);
 397                         raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
 398                         rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
 399                         break;
 400 #endif /* INET6 */
 401                 }
 402         } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 403                 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
 404                         return (1); /* unsupported */
 405         } else {
 406                 raddr = &rpool->cur->addr.v.a.addr;
 407                 rmask = &rpool->cur->addr.v.a.mask;
 408         }
 409
 410         switch (rpool->opts & PF_POOL_TYPEMASK) {
 411         case PF_POOL_NONE:
 412                 PF_ACPY(naddr, raddr, af);
 413                 break;
 414         case PF_POOL_BITMASK:
 415                 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
 416                 break;
 417         case PF_POOL_RANDOM:
 418                 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
 419                         switch (af) {
 420 #ifdef INET
 421                         case AF_INET:
 422                                 rpool->counter.addr32[0] = htonl(arc4random());
 423                                 break;
 424 #endif /* INET */
 425 #ifdef INET6
 426                         case AF_INET6:
 427                                 if (rmask->addr32[3] != 0xffffffff)
 428                                         rpool->counter.addr32[3] =
 429                                             htonl(arc4random());
 430                                 else
 431                                         break;
 432                                 if (rmask->addr32[2] != 0xffffffff)
 433                                         rpool->counter.addr32[2] =
 434                                             htonl(arc4random());
 435                                 else
 436                                         break;
 437                                 if (rmask->addr32[1] != 0xffffffff)
 438                                         rpool->counter.addr32[1] =
 439                                             htonl(arc4random());
 440                                 else
 441                                         break;
 442                                 if (rmask->addr32[0] != 0xffffffff)
 443                                         rpool->counter.addr32[0] =
 444                                             htonl(arc4random());
 445                                 break;
 446 #endif /* INET6 */
 447                         }
 448                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 449                         PF_ACPY(init_addr, naddr, af);
 450
 451                 } else {
 452                         PF_AINC(&rpool->counter, af);
 453                         PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
 454                 }
 455                 break;
 456         case PF_POOL_SRCHASH:
 457             {
 458                 unsigned char hash[16];
 459
 460                 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
 461                 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
 462                 break;
 463             }
 464         case PF_POOL_ROUNDROBIN:
 465             {
 466                 struct pf_kpooladdr *acur = rpool->cur;
 467
 468                 /*
 469                  * XXXGL: in the round-robin case we need to store
 470                  * the round-robin machine state in the rule, thus
 471                  * forwarding thread needs to modify rule.
 472                  *
 473                  * This is done w/o locking, because performance is assumed
 474                  * more important than round-robin precision.
 475                  *
 476                  * In the simpliest case we just update the "rpool->cur"
 477                  * pointer. However, if pool contains tables or dynamic
 478                  * addresses, then "tblidx" is also used to store machine
 479                  * state. Since "tblidx" is int, concurrent access to it can't
 480                  * lead to inconsistence, only to lost of precision.
 481                  *
 482                  * Things get worse, if table contains not hosts, but
 483                  * prefixes. In this case counter also stores machine state,
 484                  * and for IPv6 address, counter can't be updated atomically.
 485                  * Probably, using round-robin on a table containing IPv6
 486                  * prefixes (or even IPv4) would cause a panic.
 487                  */
 488
 489                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 490                         if (!pfr_pool_get(rpool->cur->addr.p.tbl,
 491                             &rpool->tblidx, &rpool->counter, af))
 492                                 goto get_addr;
 493                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 494                         if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 495                             &rpool->tblidx, &rpool->counter, af))
 496                                 goto get_addr;
 497                 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
 498                         goto get_addr;
 499
 500         try_next:
 501                 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
 502                         rpool->cur = TAILQ_FIRST(&rpool->list);
 503                 else
 504                         rpool->cur = TAILQ_NEXT(rpool->cur, entries);
 505                 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
 506                         rpool->tblidx = -1;
 507                         if (pfr_pool_get(rpool->cur->addr.p.tbl,
 508                             &rpool->tblidx, &rpool->counter, af)) {
 509                                 /* table contains no address of type 'af' */
 510                                 if (rpool->cur != acur)
 511                                         goto try_next;
 512                                 return (1);
 513                         }
 514                 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
 515                         rpool->tblidx = -1;
 516                         if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
 517                             &rpool->tblidx, &rpool->counter, af)) {
 518                                 /* table contains no address of type 'af' */
 519                                 if (rpool->cur != acur)
 520                                         goto try_next;
 521                                 return (1);
 522                         }
 523                 } else {
 524                         raddr = &rpool->cur->addr.v.a.addr;
 525                         rmask = &rpool->cur->addr.v.a.mask;
 526                         PF_ACPY(&rpool->counter, raddr, af);
 527                 }
 528
 529         get_addr:
 530                 PF_ACPY(naddr, &rpool->counter, af);
 531                 if (init_addr != NULL && PF_AZERO(init_addr, af))
 532                         PF_ACPY(init_addr, naddr, af);
 533                 PF_AINC(&rpool->counter, af);
 534                 break;
 535             }
 536         }
 537         if (*sn != NULL)
 538                 PF_ACPY(&(*sn)->raddr, naddr, af);
 539
 540         if (V_pf_status.debug >= PF_DEBUG_MISC &&
 541             (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
 542                 printf("pf_map_addr: selected address ");
 543                 pf_print_host(naddr, 0, af);
 544                 printf("\n");
 545         }
 546
 547         return (0);
 548 }
 549
 550 struct pf_krule *
 551 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
 552     struct pfi_kkif *kif, struct pf_ksrc_node **sn,
 553     struct pf_state_key **skp, struct pf_state_key **nkp,
 554     struct pf_addr *saddr, struct pf_addr *daddr,
 555     uint16_t sport, uint16_t dport, struct pf_kanchor_stackframe *anchor_stack)
 556 {
 557         struct pf_krule *r = NULL;
 558         struct pf_addr  *naddr;
 559         uint16_t        *nport;
 560         uint16_t         low, high;
 561
 562         PF_RULES_RASSERT();
 563         KASSERT(*skp == NULL, ("*skp not NULL"));
 564         KASSERT(*nkp == NULL, ("*nkp not NULL"));
 565
 566         if (direction == PF_OUT) {
 567                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 568                     sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
 569                 if (r == NULL)
 570                         r = pf_match_translation(pd, m, off, direction, kif,
 571                             saddr, sport, daddr, dport, PF_RULESET_NAT,
 572                             anchor_stack);
 573         } else {
 574                 r = pf_match_translation(pd, m, off, direction, kif, saddr,
 575                     sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
 576                 if (r == NULL)
 577                         r = pf_match_translation(pd, m, off, direction, kif,
 578                             saddr, sport, daddr, dport, PF_RULESET_BINAT,
 579                             anchor_stack);
 580         }
 581
 582         if (r == NULL)
 583                 return (NULL);
 584
 585         switch (r->action) {
 586         case PF_NONAT:
 587         case PF_NOBINAT:
 588         case PF_NORDR:
 589                 return (NULL);
 590         }
 591
 592         *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
 593         if (*skp == NULL)
 594                 return (NULL);
 595         *nkp = pf_state_key_clone(*skp);
 596         if (*nkp == NULL) {
 597                 uma_zfree(V_pf_state_key_z, *skp);
 598                 *skp = NULL;
 599                 return (NULL);
 600         }
 601
 602         /* XXX We only modify one side for now. */
 603         naddr = &(*nkp)->addr[1];
 604         nport = &(*nkp)->port[1];
 605
 606         switch (r->action) {
 607         case PF_NAT:
 608                 if (pd->proto == IPPROTO_ICMP) {
 609                         low  = 1;
 610                         high = 65535;
 611                 } else {
 612                         low  = r->rpool.proxy_port[0];
 613                         high = r->rpool.proxy_port[1];
 614                 }
 615                 if (r->rpool.mape.offset > 0) {
 616                         if (pf_get_mape_sport(pd->af, pd->proto, r, saddr,
 617                             sport, daddr, dport, naddr, nport, sn)) {
 618                                 DPFPRINTF(PF_DEBUG_MISC,
 619                                     ("pf: MAP-E port allocation (%u/%u/%u)"
 620                                     " failed\n",
 621                                     r->rpool.mape.offset,
 622                                     r->rpool.mape.psidlen,
 623                                     r->rpool.mape.psid));
 624                                 goto notrans;
 625                         }
 626                 } else if (pf_get_sport(pd->af, pd->proto, r, saddr, sport,
 627                     daddr, dport, naddr, nport, low, high, sn)) {
 628                         DPFPRINTF(PF_DEBUG_MISC,
 629                             ("pf: NAT proxy port allocation (%u-%u) failed\n",
 630                             r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
 631                         goto notrans;
 632                 }
 633                 break;
 634         case PF_BINAT:
 635                 switch (direction) {
 636                 case PF_OUT:
 637                         if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
 638                                 switch (pd->af) {
 639 #ifdef INET
 640                                 case AF_INET:
 641                                         if (r->rpool.cur->addr.p.dyn->
 642                                             pfid_acnt4 < 1)
 643                                                 goto notrans;
 644                                         PF_POOLMASK(naddr,
 645                                             &r->rpool.cur->addr.p.dyn->
 646                                             pfid_addr4,
 647                                             &r->rpool.cur->addr.p.dyn->
 648                                             pfid_mask4, saddr, AF_INET);
 649                                         break;
 650 #endif /* INET */
 651 #ifdef INET6
 652                                 case AF_INET6:
 653                                         if (r->rpool.cur->addr.p.dyn->
 654                                             pfid_acnt6 < 1)
 655                                                 goto notrans;
 656                                         PF_POOLMASK(naddr,
 657                                             &r->rpool.cur->addr.p.dyn->
 658                                             pfid_addr6,
 659                                             &r->rpool.cur->addr.p.dyn->
 660                                             pfid_mask6, saddr, AF_INET6);
 661                                         break;
 662 #endif /* INET6 */
 663                                 }
 664                         } else
 665                                 PF_POOLMASK(naddr,
 666                                     &r->rpool.cur->addr.v.a.addr,
 667                                     &r->rpool.cur->addr.v.a.mask, saddr,
 668                                     pd->af);
 669                         break;
 670                 case PF_IN:
 671                         if (r->src.addr.type == PF_ADDR_DYNIFTL) {
 672                                 switch (pd->af) {
 673 #ifdef INET
 674                                 case AF_INET:
 675                                         if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
 676                                                 goto notrans;
 677                                         PF_POOLMASK(naddr,
 678                                             &r->src.addr.p.dyn->pfid_addr4,
 679                                             &r->src.addr.p.dyn->pfid_mask4,
 680                                             daddr, AF_INET);
 681                                         break;
 682 #endif /* INET */
 683 #ifdef INET6
 684                                 case AF_INET6:
 685                                         if (r->src.addr.p.dyn->pfid_acnt6 < 1)
 686                                                 goto notrans;
 687                                         PF_POOLMASK(naddr,
 688                                             &r->src.addr.p.dyn->pfid_addr6,
 689                                             &r->src.addr.p.dyn->pfid_mask6,
 690                                             daddr, AF_INET6);
 691                                         break;
 692 #endif /* INET6 */
 693                                 }
 694                         } else
 695                                 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
 696                                     &r->src.addr.v.a.mask, daddr, pd->af);
 697                         break;
 698                 }
 699                 break;
 700         case PF_RDR: {
 701                 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
 702                         goto notrans;
 703                 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
 704                         PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
 705                             daddr, pd->af);
 706
 707                 if (r->rpool.proxy_port[1]) {
 708                         uint32_t        tmp_nport;
 709
 710                         tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
 711                             (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
 712                             1)) + r->rpool.proxy_port[0];
 713
 714                         /* Wrap around if necessary. */
 715                         if (tmp_nport > 65535)
 716                                 tmp_nport -= 65535;
 717                         *nport = htons((uint16_t)tmp_nport);
 718                 } else if (r->rpool.proxy_port[0])
 719                         *nport = htons(r->rpool.proxy_port[0]);
 720                 break;
 721         }
 722         default:
 723                 panic("%s: unknown action %u", __func__, r->action);
 724         }
 725
 726         /* Return success only if translation really happened. */
 727         if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
 728                 return (r);
 729
 730 notrans:
 731         uma_zfree(V_pf_state_key_z, *nkp);
 732         uma_zfree(V_pf_state_key_z, *skp);
 733         *skp = *nkp = NULL;
 734         *sn = NULL;
 735
 736         return (NULL);
 737 }