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 #include "opt_pf.h"
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43
44 #include <sys/param.h>
45 #include <sys/lock.h>
46 #include <sys/mbuf.h>
47 #include <sys/socket.h>
48 #include <sys/sysctl.h>
49
50 #include <crypto/siphash/siphash.h>
51
52 #include <net/if.h>
53 #include <net/if_var.h>
54 #include <net/vnet.h>
55 #include <net/pfvar.h>
56 #include <net/if_pflog.h>
57
58 #ifdef INET
59 #include <netinet/in_var.h>
60 #endif /* INET */
61
62 #ifdef INET6
63 #include <netinet6/in6_var.h>
64 #endif /* INET6 */
65
66
67 /*
68 * Limit the amount of work we do to find a free source port for redirects that
69 * introduce a state conflict.
70 */
71 #define V_pf_rdr_srcport_rewrite_tries VNET(pf_rdr_srcport_rewrite_tries)
72 VNET_DEFINE_STATIC(int, pf_rdr_srcport_rewrite_tries) = 16;
73
74 static uint64_t pf_hash(struct pf_addr *, struct pf_addr *,
75 struct pf_poolhashkey *, sa_family_t);
76 static struct pf_krule *pf_match_translation(int, struct pf_test_ctx *);
77 static enum pf_test_status pf_step_into_translation_anchor(int, struct pf_test_ctx *,
78 struct pf_krule *);
79 static int pf_get_sport(struct pf_pdesc *, struct pf_krule *,
80 struct pf_addr *, uint16_t *, uint16_t, uint16_t,
81 struct pf_kpool *, struct pf_udp_mapping **,
82 pf_sn_types_t);
83 static bool pf_islinklocal(const sa_family_t, const struct pf_addr *);
84
85 static uint64_t
pf_hash(struct pf_addr * inaddr,struct pf_addr * hash,struct pf_poolhashkey * key,sa_family_t af)86 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
87 struct pf_poolhashkey *key, sa_family_t af)
88 {
89 SIPHASH_CTX ctx;
90 #ifdef INET6
91 union {
92 uint64_t hash64;
93 uint32_t hash32[2];
94 } h;
95 #endif /* INET6 */
96 uint64_t res = 0;
97
98 _Static_assert(sizeof(*key) >= SIPHASH_KEY_LENGTH, "");
99
100 switch (af) {
101 #ifdef INET
102 case AF_INET:
103 res = SipHash24(&ctx, (const uint8_t *)key,
104 &inaddr->addr32[0], sizeof(inaddr->addr32[0]));
105 hash->addr32[0] = res;
106 break;
107 #endif /* INET */
108 #ifdef INET6
109 case AF_INET6:
110 res = SipHash24(&ctx, (const uint8_t *)key,
111 &inaddr->addr32[0], 4 * sizeof(inaddr->addr32[0]));
112 h.hash64 = res;
113 hash->addr32[0] = h.hash32[0];
114 hash->addr32[1] = h.hash32[1];
115 /*
116 * siphash isn't big enough, but flipping it around is
117 * good enough here.
118 */
119 hash->addr32[2] = ~h.hash32[1];
120 hash->addr32[3] = ~h.hash32[0];
121 break;
122 #endif /* INET6 */
123 default:
124 unhandled_af(af);
125 }
126 return (res);
127 }
128
129 #define PF_TEST_ATTRIB(t, a) \
130 if (t) { \
131 r = a; \
132 continue; \
133 } else do { \
134 } while (0)
135
136 static enum pf_test_status
pf_match_translation_rule(int rs_num,struct pf_test_ctx * ctx,struct pf_kruleset * ruleset)137 pf_match_translation_rule(int rs_num, struct pf_test_ctx *ctx, struct pf_kruleset *ruleset)
138 {
139 struct pf_krule *r;
140 struct pf_pdesc *pd = ctx->pd;
141 int rtableid = -1;
142
143 r = TAILQ_FIRST(ruleset->rules[rs_num].active.ptr);
144 while (r != NULL) {
145 struct pf_rule_addr *src = NULL, *dst = NULL;
146 struct pf_addr_wrap *xdst = NULL;
147
148 if (r->action == PF_BINAT && pd->dir == PF_IN) {
149 src = &r->dst;
150 if (r->rdr.cur != NULL)
151 xdst = &r->rdr.cur->addr;
152 } else {
153 src = &r->src;
154 dst = &r->dst;
155 }
156
157 pf_counter_u64_add(&r->evaluations, 1);
158 PF_TEST_ATTRIB(pfi_kkif_match(r->kif, pd->kif) == r->ifnot,
159 r->skip[PF_SKIP_IFP]);
160 PF_TEST_ATTRIB(r->direction && r->direction != pd->dir,
161 r->skip[PF_SKIP_DIR]);
162 PF_TEST_ATTRIB(r->af && r->af != pd->af,
163 r->skip[PF_SKIP_AF]);
164 PF_TEST_ATTRIB(r->proto && r->proto != pd->proto,
165 r->skip[PF_SKIP_PROTO]);
166 PF_TEST_ATTRIB(PF_MISMATCHAW(&src->addr, &pd->nsaddr, pd->af,
167 src->neg, pd->kif, M_GETFIB(pd->m)),
168 r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
169 PF_SKIP_DST_ADDR]);
170 PF_TEST_ATTRIB(src->port_op && !pf_match_port(src->port_op,
171 src->port[0], src->port[1], pd->nsport),
172 r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
173 PF_SKIP_DST_PORT]);
174 PF_TEST_ATTRIB(dst != NULL &&
175 PF_MISMATCHAW(&dst->addr, &pd->ndaddr, pd->af, dst->neg, NULL,
176 M_GETFIB(pd->m)),
177 r->skip[PF_SKIP_DST_ADDR]);
178 PF_TEST_ATTRIB(xdst != NULL && PF_MISMATCHAW(xdst, &pd->ndaddr, pd->af,
179 0, NULL, M_GETFIB(pd->m)),
180 TAILQ_NEXT(r, entries));
181 PF_TEST_ATTRIB(dst != NULL && dst->port_op &&
182 !pf_match_port(dst->port_op, dst->port[0],
183 dst->port[1], pd->ndport),
184 r->skip[PF_SKIP_DST_PORT]);
185 PF_TEST_ATTRIB(r->match_tag && !pf_match_tag(pd->m, r, &ctx->tag,
186 pd->pf_mtag ? pd->pf_mtag->tag : 0),
187 TAILQ_NEXT(r, entries));
188 PF_TEST_ATTRIB(r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
189 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd,
190 &pd->hdr.tcp), r->os_fingerprint)),
191 TAILQ_NEXT(r, entries));
192 if (r->tag)
193 ctx->tag = r->tag;
194 if (r->rtableid >= 0)
195 rtableid = r->rtableid;
196 if (r->anchor == NULL) {
197 if (r->action == PF_NONAT ||
198 r->action == PF_NORDR ||
199 r->action == PF_NOBINAT) {
200 *ctx->rm = NULL;
201 } else {
202 /*
203 * found matching r
204 */
205 ctx->tr = r;
206 /*
207 * anchor, with ruleset, where r belongs to
208 */
209 *ctx->am = ctx->a;
210 /*
211 * ruleset where r belongs to
212 */
213 *ctx->rsm = ruleset;
214 /*
215 * ruleset, where anchor belongs to.
216 */
217 ctx->arsm = ctx->aruleset;
218 }
219 } else {
220 ctx->a = r; /* remember anchor */
221 ctx->aruleset = ruleset; /* and its ruleset */
222 if (pf_step_into_translation_anchor(rs_num, ctx,
223 r) != PF_TEST_OK) {
224 break;
225 }
226 }
227 r = TAILQ_NEXT(r, entries);
228 }
229
230 if (ctx->tag > 0 && pf_tag_packet(pd, ctx->tag))
231 return (PF_TEST_FAIL);
232 if (rtableid >= 0)
233 M_SETFIB(pd->m, rtableid);
234
235 return (PF_TEST_OK);
236 }
237
238 static enum pf_test_status
pf_step_into_translation_anchor(int rs_num,struct pf_test_ctx * ctx,struct pf_krule * r)239 pf_step_into_translation_anchor(int rs_num, struct pf_test_ctx *ctx, struct pf_krule *r)
240 {
241 enum pf_test_status rv;
242
243 PF_RULES_RASSERT();
244
245 if (ctx->depth >= PF_ANCHOR_STACK_MAX) {
246 printf("%s: anchor stack overflow on %s\n",
247 __func__, r->anchor->name);
248 return (PF_TEST_FAIL);
249 }
250
251 ctx->depth++;
252
253 if (r->anchor_wildcard) {
254 struct pf_kanchor *child;
255 rv = PF_TEST_OK;
256 RB_FOREACH(child, pf_kanchor_node, &r->anchor->children) {
257 rv = pf_match_translation_rule(rs_num, ctx, &child->ruleset);
258 if ((rv == PF_TEST_QUICK) || (rv == PF_TEST_FAIL)) {
259 /*
260 * we either hit a rule qith quick action
261 * (more likely), or hit some runtime
262 * error (e.g. pool_get() faillure).
263 */
264 break;
265 }
266 }
267 } else {
268 rv = pf_match_translation_rule(rs_num, ctx, &r->anchor->ruleset);
269 }
270
271 ctx->depth--;
272
273 return (rv);
274 }
275
276 static struct pf_krule *
pf_match_translation(int rs_num,struct pf_test_ctx * ctx)277 pf_match_translation(int rs_num, struct pf_test_ctx *ctx)
278 {
279 enum pf_test_status rv;
280
281 MPASS(ctx->depth == 0);
282 rv = pf_match_translation_rule(rs_num, ctx, &pf_main_ruleset);
283 MPASS(ctx->depth == 0);
284 if (rv != PF_TEST_OK)
285 return (NULL);
286
287 return (ctx->tr);
288 }
289
290 static int
pf_get_sport(struct pf_pdesc * pd,struct pf_krule * r,struct pf_addr * naddr,uint16_t * nport,uint16_t low,uint16_t high,struct pf_kpool * rpool,struct pf_udp_mapping ** udp_mapping,pf_sn_types_t sn_type)291 pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr,
292 uint16_t *nport, uint16_t low, uint16_t high, struct pf_kpool *rpool,
293 struct pf_udp_mapping **udp_mapping, pf_sn_types_t sn_type)
294 {
295 struct pf_state_key_cmp key;
296 struct pf_addr init_addr;
297 int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN;
298 int sidx = pd->sidx;
299 int didx = pd->didx;
300
301 bzero(&init_addr, sizeof(init_addr));
302
303 if (udp_mapping) {
304 MPASS(*udp_mapping == NULL);
305 }
306
307 /*
308 * If we are UDP and have an existing mapping we can get source port
309 * from the mapping. In this case we have to look up the src_node as
310 * pf_map_addr would.
311 */
312 if (pd->proto == IPPROTO_UDP && (rpool->opts & PF_POOL_ENDPI)) {
313 struct pf_udp_endpoint_cmp udp_source;
314
315 bzero(&udp_source, sizeof(udp_source));
316 udp_source.af = pd->af;
317 pf_addrcpy(&udp_source.addr, &pd->nsaddr, pd->af);
318 udp_source.port = pd->nsport;
319 if (udp_mapping) {
320 struct pf_ksrc_node *sn = NULL;
321 struct pf_srchash *sh = NULL;
322 *udp_mapping = pf_udp_mapping_find(&udp_source);
323 if (*udp_mapping) {
324 pf_addrcpy(naddr,
325 &(*udp_mapping)->endpoints[1].addr,
326 pd->af);
327 *nport = (*udp_mapping)->endpoints[1].port;
328 /*
329 * Try to find a src_node as per pf_map_addr().
330 * XXX: Why? This code seems to do nothing.
331 */
332 if (rpool->opts & PF_POOL_STICKYADDR &&
333 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
334 sn = pf_find_src_node(&pd->nsaddr, r,
335 pd->af, &sh, sn_type, false);
336 if (sn != NULL)
337 PF_SRC_NODE_UNLOCK(sn);
338 return (0);
339 } else {
340 *udp_mapping = pf_udp_mapping_create(pd->af, &pd->nsaddr,
341 pd->nsport, &init_addr, 0);
342 if (*udp_mapping == NULL)
343 return (1);
344 }
345 }
346 }
347
348 if (pf_map_addr_sn(pd->naf, r, &pd->nsaddr, naddr, &(pd->naf), NULL,
349 &init_addr, rpool, sn_type))
350 goto failed;
351
352 if (pd->proto == IPPROTO_ICMP) {
353 if (pd->ndport == htons(ICMP_ECHO)) {
354 low = 1;
355 high = 65535;
356 } else
357 return (0); /* Don't try to modify non-echo ICMP */
358 }
359 #ifdef INET6
360 if (pd->proto == IPPROTO_ICMPV6) {
361 if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) {
362 low = 1;
363 high = 65535;
364 } else
365 return (0); /* Don't try to modify non-echo ICMP */
366 }
367 #endif /* INET6 */
368
369 bzero(&key, sizeof(key));
370 key.af = pd->naf;
371 key.proto = pd->proto;
372
373 do {
374 pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af);
375 pf_addrcpy(&key.addr[sidx], naddr, key.af);
376 key.port[didx] = pd->ndport;
377
378 if (udp_mapping && *udp_mapping)
379 pf_addrcpy(&(*udp_mapping)->endpoints[1].addr, naddr,
380 pd->af);
381
382 /*
383 * port search; start random, step;
384 * similar 2 portloop in in_pcbbind
385 */
386 if (pd->proto == IPPROTO_SCTP) {
387 key.port[sidx] = pd->nsport;
388 if (!pf_find_state_all_exists(&key, dir)) {
389 *nport = pd->nsport;
390 return (0);
391 } else {
392 return (1); /* Fail mapping. */
393 }
394 } else if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP ||
395 pd->proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
396 /*
397 * XXX bug: icmp states don't use the id on both sides.
398 * (traceroute -I through nat)
399 */
400 key.port[sidx] = pd->nsport;
401 if (!pf_find_state_all_exists(&key, dir)) {
402 *nport = pd->nsport;
403 return (0);
404 }
405 } else if (low == high) {
406 key.port[sidx] = htons(low);
407 if (!pf_find_state_all_exists(&key, dir)) {
408 if (udp_mapping && *udp_mapping != NULL) {
409 (*udp_mapping)->endpoints[1].port = htons(low);
410 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
411 *nport = htons(low);
412 return (0);
413 }
414 } else {
415 *nport = htons(low);
416 return (0);
417 }
418 }
419 } else {
420 uint32_t tmp;
421 uint16_t cut;
422
423 if (low > high) {
424 tmp = low;
425 low = high;
426 high = tmp;
427 }
428 /* low < high */
429 cut = arc4random() % (1 + high - low) + low;
430 /* low <= cut <= high */
431 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
432 if (udp_mapping && *udp_mapping != NULL) {
433 (*udp_mapping)->endpoints[sidx].port = htons(tmp);
434 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
435 *nport = htons(tmp);
436 return (0);
437 }
438 } else {
439 key.port[sidx] = htons(tmp);
440 if (!pf_find_state_all_exists(&key, dir)) {
441 *nport = htons(tmp);
442 return (0);
443 }
444 }
445 }
446 tmp = cut;
447 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
448 if (pd->proto == IPPROTO_UDP &&
449 (rpool->opts & PF_POOL_ENDPI &&
450 udp_mapping != NULL)) {
451 (*udp_mapping)->endpoints[1].port = htons(tmp);
452 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
453 *nport = htons(tmp);
454 return (0);
455 }
456 } else {
457 key.port[sidx] = htons(tmp);
458 if (!pf_find_state_all_exists(&key, dir)) {
459 *nport = htons(tmp);
460 return (0);
461 }
462 }
463 }
464 }
465
466 switch (rpool->opts & PF_POOL_TYPEMASK) {
467 case PF_POOL_RANDOM:
468 case PF_POOL_ROUNDROBIN:
469 /*
470 * pick a different source address since we're out
471 * of free port choices for the current one.
472 */
473 if (pf_map_addr_sn(pd->naf, r, &pd->nsaddr, naddr,
474 &(pd->naf), NULL, &init_addr, rpool, sn_type))
475 return (1);
476 break;
477 case PF_POOL_NONE:
478 case PF_POOL_SRCHASH:
479 case PF_POOL_BITMASK:
480 default:
481 return (1);
482 }
483 } while (! PF_AEQ(&init_addr, naddr, pd->naf) );
484
485 failed:
486 if (udp_mapping) {
487 uma_zfree(V_pf_udp_mapping_z, *udp_mapping);
488 *udp_mapping = NULL;
489 }
490
491 return (1); /* none available */
492 }
493
494 static bool
pf_islinklocal(const sa_family_t af,const struct pf_addr * addr)495 pf_islinklocal(const sa_family_t af, const struct pf_addr *addr)
496 {
497 if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&addr->v6))
498 return (true);
499 return (false);
500 }
501
502 static int
pf_get_mape_sport(struct pf_pdesc * pd,struct pf_krule * r,struct pf_addr * naddr,uint16_t * nport,struct pf_udp_mapping ** udp_mapping,struct pf_kpool * rpool)503 pf_get_mape_sport(struct pf_pdesc *pd, struct pf_krule *r,
504 struct pf_addr *naddr, uint16_t *nport, struct pf_udp_mapping **udp_mapping,
505 struct pf_kpool *rpool)
506 {
507 uint16_t psmask, low, highmask;
508 uint16_t i, ahigh, cut;
509 int ashift, psidshift;
510
511 ashift = 16 - rpool->mape.offset;
512 psidshift = ashift - rpool->mape.psidlen;
513 psmask = rpool->mape.psid & ((1U << rpool->mape.psidlen) - 1);
514 psmask = psmask << psidshift;
515 highmask = (1U << psidshift) - 1;
516
517 ahigh = (1U << rpool->mape.offset) - 1;
518 cut = arc4random() & ahigh;
519 if (cut == 0)
520 cut = 1;
521
522 for (i = cut; i <= ahigh; i++) {
523 low = (i << ashift) | psmask;
524 if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask,
525 rpool, udp_mapping, PF_SN_NAT))
526 return (0);
527 }
528 for (i = cut - 1; i > 0; i--) {
529 low = (i << ashift) | psmask;
530 if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask,
531 rpool, udp_mapping, PF_SN_NAT))
532 return (0);
533 }
534 return (1);
535 }
536
537 u_short
pf_map_addr(sa_family_t saf,struct pf_krule * r,struct pf_addr * saddr,struct pf_addr * naddr,struct pfi_kkif ** nkif,sa_family_t * naf,struct pf_addr * init_addr,struct pf_kpool * rpool)538 pf_map_addr(sa_family_t saf, struct pf_krule *r, struct pf_addr *saddr,
539 struct pf_addr *naddr, struct pfi_kkif **nkif, sa_family_t *naf,
540 struct pf_addr *init_addr, struct pf_kpool *rpool)
541 {
542 u_short reason = PFRES_MATCH;
543 struct pf_addr *raddr = NULL, *rmask = NULL;
544 struct pfr_ktable *kt;
545 uint64_t hashidx;
546 int cnt;
547 sa_family_t wanted_af;
548 u_int8_t pool_type;
549 bool prefer_ipv6_nexthop = rpool->opts & PF_POOL_IPV6NH;
550
551 KASSERT(saf != 0, ("%s: saf == 0", __func__));
552 KASSERT(naf != NULL, ("%s: naf = NULL", __func__));
553 KASSERT((*naf) != 0, ("%s: *naf = 0", __func__));
554
555 /*
556 * Given (*naf) is a hint about AF of the forwarded packet.
557 * It might be changed if prefer_ipv6_nexthop is enabled and
558 * the combination of nexthop AF and packet AF allows for it.
559 */
560 wanted_af = (*naf);
561
562 mtx_lock(&rpool->mtx);
563 /* Find the route using chosen algorithm. Store the found route
564 in src_node if it was given or found. */
565 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) {
566 reason = PFRES_MAPFAILED;
567 goto done_pool_mtx;
568 }
569 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
570 switch (wanted_af) {
571 #ifdef INET
572 case AF_INET:
573 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
574 !PF_POOL_DYNTYPE(rpool->opts)) {
575 reason = PFRES_MAPFAILED;
576 goto done_pool_mtx;
577 }
578 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
579 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
580 break;
581 #endif /* INET */
582 #ifdef INET6
583 case AF_INET6:
584 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
585 !PF_POOL_DYNTYPE(rpool->opts)) {
586 reason = PFRES_MAPFAILED;
587 goto done_pool_mtx;
588 }
589 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
590 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
591 break;
592 #endif /* INET6 */
593 default:
594 unhandled_af(wanted_af);
595 }
596 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
597 if (!PF_POOL_DYNTYPE(rpool->opts)) {
598 reason = PFRES_MAPFAILED;
599 goto done_pool_mtx; /* unsupported */
600 }
601 } else {
602 raddr = &rpool->cur->addr.v.a.addr;
603 rmask = &rpool->cur->addr.v.a.mask;
604 }
605
606 /*
607 * For pools with a single host with the prefer-ipv6-nexthop option
608 * we can return pool address of any AF, unless the forwarded packet
609 * is IPv6, then we can return only if pool address is IPv6.
610 * For non-prefer-ipv6-nexthop we can return pool address only
611 * of wanted AF, unless the pool address'es AF is unknown, which
612 * happens in case old ioctls have been used to set up the pool.
613 *
614 * Round-robin pools have their own logic for retrying next addresses.
615 */
616 pool_type = rpool->opts & PF_POOL_TYPEMASK;
617 if (pool_type == PF_POOL_NONE || pool_type == PF_POOL_BITMASK ||
618 ((pool_type == PF_POOL_RANDOM || pool_type == PF_POOL_SRCHASH) &&
619 rpool->cur->addr.type != PF_ADDR_TABLE &&
620 rpool->cur->addr.type != PF_ADDR_DYNIFTL)) {
621 if (prefer_ipv6_nexthop) {
622 if (rpool->cur->af == AF_INET && (*naf) == AF_INET6) {
623 reason = PFRES_MAPFAILED;
624 goto done_pool_mtx;
625 }
626 wanted_af = rpool->cur->af;
627 } else {
628 if (rpool->cur->af != 0 && rpool->cur->af != (*naf)) {
629 reason = PFRES_MAPFAILED;
630 goto done_pool_mtx;
631 }
632 }
633 }
634
635 switch (pool_type) {
636 case PF_POOL_NONE:
637 pf_addrcpy(naddr, raddr, wanted_af);
638 break;
639 case PF_POOL_BITMASK:
640 pf_poolmask(naddr, raddr, rmask, saddr, wanted_af);
641 break;
642 case PF_POOL_RANDOM:
643 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
644 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
645 if (rpool->cur->addr.type == PF_ADDR_TABLE)
646 kt = rpool->cur->addr.p.tbl;
647 else
648 kt = rpool->cur->addr.p.dyn->pfid_kt;
649 kt = pfr_ktable_select_active(kt);
650 if (kt == NULL) {
651 reason = PFRES_MAPFAILED;
652 goto done_pool_mtx; /* unsupported */
653 }
654 cnt = kt->pfrkt_cnt;
655 if (cnt == 0)
656 rpool->tblidx = 0;
657 else
658 rpool->tblidx = (int)arc4random_uniform(cnt);
659 memset(&rpool->counter, 0, sizeof(rpool->counter));
660 if (prefer_ipv6_nexthop)
661 wanted_af = AF_INET6;
662 retry_other_af_random:
663 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
664 wanted_af, pf_islinklocal, false)) {
665 /* Retry with IPv4 nexthop for IPv4 traffic */
666 if (prefer_ipv6_nexthop &&
667 wanted_af == AF_INET6 &&
668 (*naf) == AF_INET) {
669 wanted_af = AF_INET;
670 goto retry_other_af_random;
671 } else {
672 /* no hosts in wanted AF */
673 reason = PFRES_MAPFAILED;
674 goto done_pool_mtx;
675 }
676 }
677 pf_addrcpy(naddr, &rpool->counter, wanted_af);
678 } else if (init_addr != NULL && PF_AZERO(init_addr,
679 wanted_af)) {
680 switch (wanted_af) {
681 #ifdef INET
682 case AF_INET:
683 rpool->counter.addr32[0] = arc4random();
684 break;
685 #endif /* INET */
686 #ifdef INET6
687 case AF_INET6:
688 if (rmask->addr32[3] != 0xffffffff)
689 rpool->counter.addr32[3] =
690 arc4random();
691 else
692 break;
693 if (rmask->addr32[2] != 0xffffffff)
694 rpool->counter.addr32[2] =
695 arc4random();
696 else
697 break;
698 if (rmask->addr32[1] != 0xffffffff)
699 rpool->counter.addr32[1] =
700 arc4random();
701 else
702 break;
703 if (rmask->addr32[0] != 0xffffffff)
704 rpool->counter.addr32[0] =
705 arc4random();
706 break;
707 #endif /* INET6 */
708 }
709 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
710 wanted_af);
711 pf_addrcpy(init_addr, naddr, wanted_af);
712
713 } else {
714 pf_addr_inc(&rpool->counter, wanted_af);
715 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
716 wanted_af);
717 }
718 break;
719 case PF_POOL_SRCHASH:
720 {
721 unsigned char hash[16];
722
723 hashidx =
724 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key,
725 wanted_af);
726 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
727 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
728 if (rpool->cur->addr.type == PF_ADDR_TABLE)
729 kt = rpool->cur->addr.p.tbl;
730 else
731 kt = rpool->cur->addr.p.dyn->pfid_kt;
732 kt = pfr_ktable_select_active(kt);
733 if (kt == NULL) {
734 reason = PFRES_MAPFAILED;
735 goto done_pool_mtx; /* unsupported */
736 }
737 cnt = kt->pfrkt_cnt;
738 if (cnt == 0)
739 rpool->tblidx = 0;
740 else
741 rpool->tblidx = (int)(hashidx % cnt);
742 memset(&rpool->counter, 0, sizeof(rpool->counter));
743 if (prefer_ipv6_nexthop)
744 wanted_af = AF_INET6;
745 retry_other_af_srchash:
746 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
747 wanted_af, pf_islinklocal, false)) {
748 /* Retry with IPv4 nexthop for IPv4 traffic */
749 if (prefer_ipv6_nexthop &&
750 wanted_af == AF_INET6 &&
751 (*naf) == AF_INET) {
752 wanted_af = AF_INET;
753 goto retry_other_af_srchash;
754 } else {
755 /* no hosts in wanted AF */
756 reason = PFRES_MAPFAILED;
757 goto done_pool_mtx;
758 }
759 }
760 pf_addrcpy(naddr, &rpool->counter, wanted_af);
761 } else {
762 pf_poolmask(naddr, raddr, rmask,
763 (struct pf_addr *)&hash, wanted_af);
764 }
765 break;
766 }
767 case PF_POOL_ROUNDROBIN:
768 {
769 struct pf_kpooladdr *acur = rpool->cur;
770
771 retry_other_af_rr:
772 if (prefer_ipv6_nexthop)
773 wanted_af = rpool->ipv6_nexthop_af;
774 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
775 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
776 &rpool->tblidx, &rpool->counter, wanted_af,
777 NULL, true))
778 goto get_addr;
779 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
780 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
781 &rpool->tblidx, &rpool->counter, wanted_af,
782 pf_islinklocal, true))
783 goto get_addr;
784 } else if (rpool->cur->af == wanted_af &&
785 pf_match_addr(0, raddr, rmask, &rpool->counter, wanted_af))
786 goto get_addr;
787 if (prefer_ipv6_nexthop &&
788 (*naf) == AF_INET && wanted_af == AF_INET6) {
789 /* Reset table index when changing wanted AF. */
790 rpool->tblidx = -1;
791 rpool->ipv6_nexthop_af = AF_INET;
792 goto retry_other_af_rr;
793 }
794 try_next:
795 /* Reset prefer-ipv6-nexthop search to IPv6 when iterating pools. */
796 rpool->ipv6_nexthop_af = AF_INET6;
797 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
798 rpool->cur = TAILQ_FIRST(&rpool->list);
799 else
800 rpool->cur = TAILQ_NEXT(rpool->cur, entries);
801 try_next_ipv6_nexthop_rr:
802 /* Reset table index when iterating pools or changing wanted AF. */
803 rpool->tblidx = -1;
804 if (prefer_ipv6_nexthop)
805 wanted_af = rpool->ipv6_nexthop_af;
806 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
807 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
808 &rpool->tblidx, &rpool->counter, wanted_af, NULL,
809 true))
810 goto get_addr;
811 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
812 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
813 &rpool->tblidx, &rpool->counter, wanted_af, pf_islinklocal,
814 true))
815 goto get_addr;
816 } else {
817 if (rpool->cur->af == wanted_af) {
818 raddr = &rpool->cur->addr.v.a.addr;
819 rmask = &rpool->cur->addr.v.a.mask;
820 pf_addrcpy(&rpool->counter, raddr, wanted_af);
821 goto get_addr;
822 }
823 }
824 if (prefer_ipv6_nexthop &&
825 (*naf) == AF_INET && wanted_af == AF_INET6) {
826 rpool->ipv6_nexthop_af = AF_INET;
827 goto try_next_ipv6_nexthop_rr;
828 }
829 if (rpool->cur != acur)
830 goto try_next;
831 reason = PFRES_MAPFAILED;
832 goto done_pool_mtx;
833 get_addr:
834 pf_addrcpy(naddr, &rpool->counter, wanted_af);
835 if (init_addr != NULL && PF_AZERO(init_addr, wanted_af))
836 pf_addrcpy(init_addr, naddr, wanted_af);
837 pf_addr_inc(&rpool->counter, wanted_af);
838 break;
839 }
840 }
841
842 if (wanted_af == 0) {
843 reason = PFRES_MAPFAILED;
844 goto done_pool_mtx;
845 }
846
847 if (nkif)
848 *nkif = rpool->cur->kif;
849
850 (*naf) = wanted_af;
851
852 done_pool_mtx:
853 mtx_unlock(&rpool->mtx);
854
855 return (reason);
856 }
857
858 u_short
pf_map_addr_sn(sa_family_t saf,struct pf_krule * r,struct pf_addr * saddr,struct pf_addr * naddr,sa_family_t * naf,struct pfi_kkif ** nkif,struct pf_addr * init_addr,struct pf_kpool * rpool,pf_sn_types_t sn_type)859 pf_map_addr_sn(sa_family_t saf, struct pf_krule *r, struct pf_addr *saddr,
860 struct pf_addr *naddr, sa_family_t *naf, struct pfi_kkif **nkif,
861 struct pf_addr *init_addr, struct pf_kpool *rpool, pf_sn_types_t sn_type)
862 {
863 struct pf_ksrc_node *sn = NULL;
864 struct pf_srchash *sh = NULL;
865 u_short reason = 0;
866
867 /*
868 * If this is a sticky-address rule, try to find an existing src_node.
869 */
870 if (rpool->opts & PF_POOL_STICKYADDR &&
871 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
872 sn = pf_find_src_node(saddr, r, saf, &sh, sn_type, false);
873
874 if (sn != NULL) {
875 PF_SRC_NODE_LOCK_ASSERT(sn);
876 (*naf) = sn->raf;
877
878 /* If the supplied address is the same as the current one we've
879 * been asked before, so tell the caller that there's no other
880 * address to be had. */
881
882 if (PF_AEQ(naddr, &(sn->raddr), *naf)) {
883 printf("%s: no more addresses\n", __func__);
884 reason = PFRES_MAPFAILED;
885 goto done;
886 }
887
888 pf_addrcpy(naddr, &(sn->raddr), *naf);
889
890 if (nkif)
891 *nkif = sn->rkif;
892 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
893 printf("%s: src tracking maps ", __func__);
894 pf_print_host(saddr, 0, saf);
895 printf(" to ");
896 pf_print_host(naddr, 0, *naf);
897 if (nkif)
898 printf("@%s", (*nkif)->pfik_name);
899 printf("\n");
900 }
901 goto done;
902 }
903
904 /*
905 * Source node has not been found. Find a new address and store it
906 * in variables given by the caller.
907 */
908 if ((reason = pf_map_addr(saf, r, saddr, naddr, nkif, naf, init_addr,
909 rpool)) != 0) {
910 if (V_pf_status.debug >= PF_DEBUG_MISC)
911 printf("%s: pf_map_addr has failed\n", __func__);
912 goto done;
913 }
914
915 if (V_pf_status.debug >= PF_DEBUG_NOISY &&
916 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
917 printf("%s: selected address ", __func__);
918 pf_print_host(naddr, 0, *naf);
919 if (nkif)
920 printf("@%s", (*nkif)->pfik_name);
921 printf("\n");
922 }
923
924 done:
925 if (sn != NULL)
926 PF_SRC_NODE_UNLOCK(sn);
927
928 return (reason);
929 }
930
931 u_short
pf_get_translation(struct pf_test_ctx * ctx)932 pf_get_translation(struct pf_test_ctx *ctx)
933 {
934 struct pf_krule *r = NULL;
935 u_short transerror;
936
937 PF_RULES_RASSERT();
938 KASSERT(ctx->sk == NULL, ("*skp not NULL"));
939 KASSERT(ctx->nk == NULL, ("*nkp not NULL"));
940
941 ctx->nr = NULL;
942
943 if (ctx->pd->dir == PF_OUT) {
944 r = pf_match_translation(PF_RULESET_BINAT, ctx);
945 if (r == NULL)
946 r = pf_match_translation(PF_RULESET_NAT, ctx);
947 } else {
948 r = pf_match_translation(PF_RULESET_RDR, ctx);
949 if (r == NULL)
950 r = pf_match_translation(PF_RULESET_BINAT, ctx);
951 }
952
953 if (r == NULL)
954 return (PFRES_MAX);
955
956 switch (r->action) {
957 case PF_NONAT:
958 case PF_NOBINAT:
959 case PF_NORDR:
960 return (PFRES_MAX);
961 }
962
963 transerror = pf_get_transaddr(ctx, r, r->action, &(r->rdr));
964 if (transerror == PFRES_MATCH)
965 ctx->nr = r;
966
967 return (transerror);
968 }
969
970 u_short
pf_get_transaddr(struct pf_test_ctx * ctx,struct pf_krule * r,uint8_t nat_action,struct pf_kpool * rpool)971 pf_get_transaddr(struct pf_test_ctx *ctx, struct pf_krule *r,
972 uint8_t nat_action, struct pf_kpool *rpool)
973 {
974 struct pf_pdesc *pd = ctx->pd;
975 struct pf_addr *naddr;
976 uint16_t *nportp;
977 uint16_t low, high;
978 u_short reason;
979
980 PF_RULES_RASSERT();
981 KASSERT(r != NULL, ("r is NULL"));
982 KASSERT(!(r->rule_flag & PFRULE_AFTO), ("AFTO rule"));
983
984 if (ctx->sk == NULL && ctx->nk == NULL) {
985 if (pf_state_key_setup(pd, pd->nsport, pd->ndport, &ctx->sk,
986 &ctx->nk))
987 return (PFRES_MEMORY);
988 }
989
990 naddr = &ctx->nk->addr[1];
991 nportp = &ctx->nk->port[1];
992
993 switch (nat_action) {
994 case PF_NAT:
995 if (pd->proto == IPPROTO_ICMP) {
996 low = 1;
997 high = 65535;
998 } else {
999 low = rpool->proxy_port[0];
1000 high = rpool->proxy_port[1];
1001 }
1002 if (rpool->mape.offset > 0) {
1003 if (pf_get_mape_sport(pd, r, naddr, nportp,
1004 &ctx->udp_mapping, rpool)) {
1005 DPFPRINTF(PF_DEBUG_MISC,
1006 "pf: MAP-E port allocation (%u/%u/%u)"
1007 " failed",
1008 rpool->mape.offset,
1009 rpool->mape.psidlen,
1010 rpool->mape.psid);
1011 reason = PFRES_MAPFAILED;
1012 goto notrans;
1013 }
1014 } else if (pf_get_sport(pd, r, naddr, nportp, low, high,
1015 rpool, &ctx->udp_mapping, PF_SN_NAT)) {
1016 DPFPRINTF(PF_DEBUG_MISC,
1017 "pf: NAT proxy port allocation (%u-%u) failed",
1018 rpool->proxy_port[0], rpool->proxy_port[1]);
1019 reason = PFRES_MAPFAILED;
1020 goto notrans;
1021 }
1022 break;
1023 case PF_BINAT:
1024 switch (pd->dir) {
1025 case PF_OUT:
1026 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL){
1027 switch (pd->af) {
1028 #ifdef INET
1029 case AF_INET:
1030 if (rpool->cur->addr.p.dyn->
1031 pfid_acnt4 < 1) {
1032 reason = PFRES_MAPFAILED;
1033 goto notrans;
1034 }
1035 pf_poolmask(naddr,
1036 &rpool->cur->addr.p.dyn->pfid_addr4,
1037 &rpool->cur->addr.p.dyn->pfid_mask4,
1038 &pd->nsaddr, AF_INET);
1039 break;
1040 #endif /* INET */
1041 #ifdef INET6
1042 case AF_INET6:
1043 if (rpool->cur->addr.p.dyn->
1044 pfid_acnt6 < 1) {
1045 reason = PFRES_MAPFAILED;
1046 goto notrans;
1047 }
1048 pf_poolmask(naddr,
1049 &rpool->cur->addr.p.dyn->pfid_addr6,
1050 &rpool->cur->addr.p.dyn->pfid_mask6,
1051 &pd->nsaddr, AF_INET6);
1052 break;
1053 #endif /* INET6 */
1054 }
1055 } else
1056 pf_poolmask(naddr,
1057 &rpool->cur->addr.v.a.addr,
1058 &rpool->cur->addr.v.a.mask, &pd->nsaddr,
1059 pd->af);
1060 break;
1061 case PF_IN:
1062 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
1063 switch (pd->af) {
1064 #ifdef INET
1065 case AF_INET:
1066 if (r->src.addr.p.dyn->pfid_acnt4 < 1) {
1067 reason = PFRES_MAPFAILED;
1068 goto notrans;
1069 }
1070 pf_poolmask(naddr,
1071 &r->src.addr.p.dyn->pfid_addr4,
1072 &r->src.addr.p.dyn->pfid_mask4,
1073 &pd->ndaddr, AF_INET);
1074 break;
1075 #endif /* INET */
1076 #ifdef INET6
1077 case AF_INET6:
1078 if (r->src.addr.p.dyn->pfid_acnt6 < 1) {
1079 reason = PFRES_MAPFAILED;
1080 goto notrans;
1081 }
1082 pf_poolmask(naddr,
1083 &r->src.addr.p.dyn->pfid_addr6,
1084 &r->src.addr.p.dyn->pfid_mask6,
1085 &pd->ndaddr, AF_INET6);
1086 break;
1087 #endif /* INET6 */
1088 }
1089 } else
1090 pf_poolmask(naddr, &r->src.addr.v.a.addr,
1091 &r->src.addr.v.a.mask, &pd->ndaddr, pd->af);
1092 break;
1093 }
1094 break;
1095 case PF_RDR: {
1096 struct pf_state_key_cmp key;
1097 int tries;
1098 uint16_t cut, low, high, nport;
1099
1100 reason = pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr,
1101 &(pd->naf), NULL, NULL, rpool, PF_SN_NAT);
1102
1103 if (reason != 0)
1104 goto notrans;
1105 if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
1106 pf_poolmask(naddr, naddr, &rpool->cur->addr.v.a.mask,
1107 &pd->ndaddr, pd->af);
1108
1109 /* Do not change SCTP ports. */
1110 if (pd->proto == IPPROTO_SCTP)
1111 break;
1112
1113 if (rpool->proxy_port[1]) {
1114 uint32_t tmp_nport;
1115 uint16_t div;
1116
1117 div = r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1;
1118 div = (div == 0) ? 1 : div;
1119
1120 tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % div) +
1121 rpool->proxy_port[0];
1122
1123 /* Wrap around if necessary. */
1124 if (tmp_nport > 65535)
1125 tmp_nport -= 65535;
1126 nport = htons((uint16_t)tmp_nport);
1127 } else if (rpool->proxy_port[0])
1128 nport = htons(rpool->proxy_port[0]);
1129 else
1130 nport = pd->ndport;
1131
1132 /*
1133 * Update the destination port.
1134 */
1135 *nportp = nport;
1136
1137 /*
1138 * Do we have a source port conflict in the stack state? Try to
1139 * modulate the source port if so. Note that this is racy since
1140 * the state lookup may not find any matches here but will once
1141 * pf_create_state() actually instantiates the state.
1142 */
1143 bzero(&key, sizeof(key));
1144 key.af = pd->af;
1145 key.proto = pd->proto;
1146 key.port[0] = pd->nsport;
1147 pf_addrcpy(&key.addr[0], &pd->nsaddr, key.af);
1148 key.port[1] = nport;
1149 pf_addrcpy(&key.addr[1], naddr, key.af);
1150
1151 if (!pf_find_state_all_exists(&key, PF_OUT))
1152 break;
1153
1154 tries = 0;
1155
1156 low = 50001; /* XXX-MJ PF_NAT_PROXY_PORT_LOW/HIGH */
1157 high = 65535;
1158 cut = arc4random() % (1 + high - low) + low;
1159 for (uint32_t tmp = cut;
1160 tmp <= high && tmp <= UINT16_MAX &&
1161 tries < V_pf_rdr_srcport_rewrite_tries;
1162 tmp++, tries++) {
1163 key.port[0] = htons(tmp);
1164 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1165 /* Update the source port. */
1166 ctx->nk->port[0] = htons(tmp);
1167 goto out;
1168 }
1169 }
1170 for (uint32_t tmp = cut - 1;
1171 tmp >= low && tries < V_pf_rdr_srcport_rewrite_tries;
1172 tmp--, tries++) {
1173 key.port[0] = htons(tmp);
1174 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1175 /* Update the source port. */
1176 ctx->nk->port[0] = htons(tmp);
1177 goto out;
1178 }
1179 }
1180
1181 /*
1182 * We failed to find a match. Push on ahead anyway, let
1183 * pf_state_insert() be the arbiter of whether the state
1184 * conflict is tolerable. In particular, with TCP connections
1185 * the state may be reused if the TCP state is terminal.
1186 */
1187 DPFPRINTF(PF_DEBUG_MISC,
1188 "pf: RDR source port allocation failed");
1189 break;
1190
1191 out:
1192 DPFPRINTF(PF_DEBUG_MISC,
1193 "pf: RDR source port allocation %u->%u",
1194 ntohs(pd->nsport), ntohs(ctx->nk->port[0]));
1195 break;
1196 }
1197 default:
1198 panic("%s: unknown action %u", __func__, r->action);
1199 }
1200
1201 /* Return success only if translation really happened. */
1202 if (bcmp(ctx->sk, ctx->nk, sizeof(struct pf_state_key_cmp))) {
1203 return (PFRES_MATCH);
1204 }
1205
1206 reason = PFRES_MAX;
1207 notrans:
1208 uma_zfree(V_pf_state_key_z, ctx->nk);
1209 uma_zfree(V_pf_state_key_z, ctx->sk);
1210 ctx->sk = ctx->nk = NULL;
1211
1212 return (reason);
1213 }
1214
1215 int
pf_get_transaddr_af(struct pf_krule * r,struct pf_pdesc * pd)1216 pf_get_transaddr_af(struct pf_krule *r, struct pf_pdesc *pd)
1217 {
1218 #if defined(INET) && defined(INET6)
1219 struct pf_addr ndaddr, nsaddr, naddr;
1220 u_int16_t nport = 0;
1221 int prefixlen = 96;
1222
1223 bzero(&nsaddr, sizeof(nsaddr));
1224 bzero(&ndaddr, sizeof(ndaddr));
1225
1226 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1227 printf("pf: af-to %s %s, ",
1228 pd->naf == AF_INET ? "inet" : "inet6",
1229 TAILQ_EMPTY(&r->rdr.list) ? "nat" : "rdr");
1230 pf_print_host(&pd->nsaddr, pd->nsport, pd->af);
1231 printf(" -> ");
1232 pf_print_host(&pd->ndaddr, pd->ndport, pd->af);
1233 printf("\n");
1234 }
1235
1236 if (TAILQ_EMPTY(&r->nat.list))
1237 panic("pf_get_transaddr_af: no nat pool for source address");
1238
1239 /* get source address and port */
1240 if (pf_get_sport(pd, r, &nsaddr, &nport, r->nat.proxy_port[0],
1241 r->nat.proxy_port[1], &r->nat, NULL, PF_SN_NAT)) {
1242 DPFPRINTF(PF_DEBUG_MISC,
1243 "pf: af-to NAT proxy port allocation (%u-%u) failed",
1244 r->nat.proxy_port[0], r->nat.proxy_port[1]);
1245 return (-1);
1246 }
1247
1248 if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) {
1249 pd->ndport = ntohs(pd->ndport);
1250 if (pd->ndport == ICMP6_ECHO_REQUEST)
1251 pd->ndport = ICMP_ECHO;
1252 else if (pd->ndport == ICMP6_ECHO_REPLY)
1253 pd->ndport = ICMP_ECHOREPLY;
1254 pd->ndport = htons(pd->ndport);
1255 } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) {
1256 pd->nsport = ntohs(pd->nsport);
1257 if (pd->ndport == ICMP_ECHO)
1258 pd->ndport = ICMP6_ECHO_REQUEST;
1259 else if (pd->ndport == ICMP_ECHOREPLY)
1260 pd->ndport = ICMP6_ECHO_REPLY;
1261 pd->nsport = htons(pd->nsport);
1262 }
1263
1264 /* get the destination address and port */
1265 if (! TAILQ_EMPTY(&r->rdr.list)) {
1266 if (pf_map_addr_sn(pd->naf, r, &nsaddr, &naddr, &(pd->naf),
1267 NULL, NULL, &r->rdr, PF_SN_NAT))
1268 return (-1);
1269 if (r->rdr.proxy_port[0])
1270 pd->ndport = htons(r->rdr.proxy_port[0]);
1271
1272 if (pd->naf == AF_INET) {
1273 /* The prefix is the IPv4 rdr address */
1274 prefixlen = in_mask2len(
1275 (struct in_addr *)&r->rdr.cur->addr.v.a.mask);
1276 inet_nat46(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1277 prefixlen);
1278 } else {
1279 /* The prefix is the IPv6 rdr address */
1280 prefixlen = in6_mask2len(
1281 (struct in6_addr *)&r->rdr.cur->addr.v.a.mask, NULL);
1282 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1283 prefixlen);
1284 }
1285 } else {
1286 if (pd->naf == AF_INET) {
1287 /* The prefix is the IPv6 dst address */
1288 prefixlen = in6_mask2len(
1289 (struct in6_addr *)&r->dst.addr.v.a.mask, NULL);
1290 if (prefixlen < 32)
1291 prefixlen = 96;
1292 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &pd->ndaddr,
1293 prefixlen);
1294 } else {
1295 /*
1296 * The prefix is the IPv6 nat address
1297 * (that was stored in pd->nsaddr)
1298 */
1299 prefixlen = in6_mask2len(
1300 (struct in6_addr *)&r->nat.cur->addr.v.a.mask, NULL);
1301 if (prefixlen > 96)
1302 prefixlen = 96;
1303 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &nsaddr,
1304 prefixlen);
1305 }
1306 }
1307
1308 pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf);
1309 pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf);
1310
1311 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1312 printf("pf: af-to %s done, prefixlen %d, ",
1313 pd->naf == AF_INET ? "inet" : "inet6",
1314 prefixlen);
1315 pf_print_host(&pd->nsaddr, pd->nsport, pd->naf);
1316 printf(" -> ");
1317 pf_print_host(&pd->ndaddr, pd->ndport, pd->naf);
1318 printf("\n");
1319 }
1320
1321 return (0);
1322 #else
1323 return (-1);
1324 #endif
1325 }
1326