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 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 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
549 KASSERT(saf != 0, ("%s: saf == 0", __func__));
550 KASSERT(naf != NULL, ("%s: naf = NULL", __func__));
551 KASSERT((*naf) != 0, ("%s: *naf = 0", __func__));
552
553 wanted_af = (*naf);
554
555 mtx_lock(&rpool->mtx);
556 /* Find the route using chosen algorithm. Store the found route
557 in src_node if it was given or found. */
558 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) {
559 reason = PFRES_MAPFAILED;
560 goto done_pool_mtx;
561 }
562 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
563 switch (wanted_af) {
564 #ifdef INET
565 case AF_INET:
566 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
567 !PF_POOL_DYNTYPE(rpool->opts)) {
568 reason = PFRES_MAPFAILED;
569 goto done_pool_mtx;
570 }
571 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
572 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
573 break;
574 #endif /* INET */
575 #ifdef INET6
576 case AF_INET6:
577 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
578 !PF_POOL_DYNTYPE(rpool->opts)) {
579 reason = PFRES_MAPFAILED;
580 goto done_pool_mtx;
581 }
582 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
583 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
584 break;
585 #endif /* INET6 */
586 default:
587 unhandled_af(wanted_af);
588 }
589 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
590 if (!PF_POOL_DYNTYPE(rpool->opts)) {
591 reason = PFRES_MAPFAILED;
592 goto done_pool_mtx; /* unsupported */
593 }
594 } else {
595 raddr = &rpool->cur->addr.v.a.addr;
596 rmask = &rpool->cur->addr.v.a.mask;
597 /*
598 * For single addresses check their address family. Unless they
599 * have none, which happens when addresses are added with
600 * the old ioctl mechanism. In such case trust that the address
601 * has the proper AF.
602 */
603 if (rpool->cur->af && rpool->cur->af != wanted_af) {
604 reason = PFRES_MAPFAILED;
605 goto done_pool_mtx;
606 }
607 }
608
609 switch (rpool->opts & PF_POOL_TYPEMASK) {
610 case PF_POOL_NONE:
611 pf_addrcpy(naddr, raddr, wanted_af);
612 break;
613 case PF_POOL_BITMASK:
614 pf_poolmask(naddr, raddr, rmask, saddr, wanted_af);
615 break;
616 case PF_POOL_RANDOM:
617 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
618 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
619 if (rpool->cur->addr.type == PF_ADDR_TABLE)
620 kt = rpool->cur->addr.p.tbl;
621 else
622 kt = rpool->cur->addr.p.dyn->pfid_kt;
623 kt = pfr_ktable_select_active(kt);
624 if (kt == NULL) {
625 reason = PFRES_MAPFAILED;
626 goto done_pool_mtx; /* unsupported */
627 }
628 cnt = kt->pfrkt_cnt;
629 if (cnt == 0)
630 rpool->tblidx = 0;
631 else
632 rpool->tblidx = (int)arc4random_uniform(cnt);
633 memset(&rpool->counter, 0, sizeof(rpool->counter));
634 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
635 wanted_af, pf_islinklocal, false)) {
636 reason = PFRES_MAPFAILED;
637 goto done_pool_mtx; /* unsupported */
638 }
639 pf_addrcpy(naddr, &rpool->counter, wanted_af);
640 } else if (init_addr != NULL && PF_AZERO(init_addr,
641 wanted_af)) {
642 switch (wanted_af) {
643 #ifdef INET
644 case AF_INET:
645 rpool->counter.addr32[0] = arc4random();
646 break;
647 #endif /* INET */
648 #ifdef INET6
649 case AF_INET6:
650 if (rmask->addr32[3] != 0xffffffff)
651 rpool->counter.addr32[3] =
652 arc4random();
653 else
654 break;
655 if (rmask->addr32[2] != 0xffffffff)
656 rpool->counter.addr32[2] =
657 arc4random();
658 else
659 break;
660 if (rmask->addr32[1] != 0xffffffff)
661 rpool->counter.addr32[1] =
662 arc4random();
663 else
664 break;
665 if (rmask->addr32[0] != 0xffffffff)
666 rpool->counter.addr32[0] =
667 arc4random();
668 break;
669 #endif /* INET6 */
670 }
671 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
672 wanted_af);
673 pf_addrcpy(init_addr, naddr, wanted_af);
674
675 } else {
676 pf_addr_inc(&rpool->counter, wanted_af);
677 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
678 wanted_af);
679 }
680 break;
681 case PF_POOL_SRCHASH:
682 {
683 unsigned char hash[16];
684
685 hashidx =
686 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key,
687 wanted_af);
688 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
689 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
690 if (rpool->cur->addr.type == PF_ADDR_TABLE)
691 kt = rpool->cur->addr.p.tbl;
692 else
693 kt = rpool->cur->addr.p.dyn->pfid_kt;
694 kt = pfr_ktable_select_active(kt);
695 if (kt == NULL) {
696 reason = PFRES_MAPFAILED;
697 goto done_pool_mtx; /* unsupported */
698 }
699 cnt = kt->pfrkt_cnt;
700 if (cnt == 0)
701 rpool->tblidx = 0;
702 else
703 rpool->tblidx = (int)(hashidx % cnt);
704 memset(&rpool->counter, 0, sizeof(rpool->counter));
705 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
706 wanted_af, pf_islinklocal, false)) {
707 reason = PFRES_MAPFAILED;
708 goto done_pool_mtx; /* unsupported */
709 }
710 pf_addrcpy(naddr, &rpool->counter, wanted_af);
711 } else {
712 pf_poolmask(naddr, raddr, rmask,
713 (struct pf_addr *)&hash, wanted_af);
714 }
715 break;
716 }
717 case PF_POOL_ROUNDROBIN:
718 {
719 struct pf_kpooladdr *acur = rpool->cur;
720
721 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
722 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
723 &rpool->tblidx, &rpool->counter, wanted_af,
724 NULL, true))
725 goto get_addr;
726 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
727 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
728 &rpool->tblidx, &rpool->counter, wanted_af,
729 pf_islinklocal, true))
730 goto get_addr;
731 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter,
732 wanted_af))
733 goto get_addr;
734
735 try_next:
736 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
737 rpool->cur = TAILQ_FIRST(&rpool->list);
738 else
739 rpool->cur = TAILQ_NEXT(rpool->cur, entries);
740 rpool->tblidx = -1;
741 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
742 if (pfr_pool_get(rpool->cur->addr.p.tbl,
743 &rpool->tblidx, &rpool->counter, wanted_af, NULL,
744 true)) {
745 /* table contains no address of type 'wanted_af' */
746 if (rpool->cur != acur)
747 goto try_next;
748 reason = PFRES_MAPFAILED;
749 goto done_pool_mtx;
750 }
751 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
752 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
753 &rpool->tblidx, &rpool->counter, wanted_af,
754 pf_islinklocal, true)) {
755 /* interface has no address of type 'wanted_af' */
756 if (rpool->cur != acur)
757 goto try_next;
758 reason = PFRES_MAPFAILED;
759 goto done_pool_mtx;
760 }
761 } else {
762 raddr = &rpool->cur->addr.v.a.addr;
763 rmask = &rpool->cur->addr.v.a.mask;
764 if (rpool->cur->af && rpool->cur->af != wanted_af) {
765 reason = PFRES_MAPFAILED;
766 goto done_pool_mtx;
767 }
768 pf_addrcpy(&rpool->counter, raddr, wanted_af);
769 }
770
771 get_addr:
772 pf_addrcpy(naddr, &rpool->counter, wanted_af);
773 if (init_addr != NULL && PF_AZERO(init_addr, wanted_af))
774 pf_addrcpy(init_addr, naddr, wanted_af);
775 pf_addr_inc(&rpool->counter, wanted_af);
776 break;
777 }
778 }
779
780 if (nkif)
781 *nkif = rpool->cur->kif;
782
783 done_pool_mtx:
784 mtx_unlock(&rpool->mtx);
785
786 return (reason);
787 }
788
789 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)790 pf_map_addr_sn(sa_family_t saf, struct pf_krule *r, struct pf_addr *saddr,
791 struct pf_addr *naddr, sa_family_t *naf, struct pfi_kkif **nkif,
792 struct pf_addr *init_addr, struct pf_kpool *rpool, pf_sn_types_t sn_type)
793 {
794 struct pf_ksrc_node *sn = NULL;
795 struct pf_srchash *sh = NULL;
796 u_short reason = 0;
797
798 /*
799 * If this is a sticky-address rule, try to find an existing src_node.
800 */
801 if (rpool->opts & PF_POOL_STICKYADDR &&
802 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
803 sn = pf_find_src_node(saddr, r, saf, &sh, sn_type, false);
804
805 if (sn != NULL) {
806 PF_SRC_NODE_LOCK_ASSERT(sn);
807 (*naf) = sn->raf;
808
809 /* If the supplied address is the same as the current one we've
810 * been asked before, so tell the caller that there's no other
811 * address to be had. */
812
813 if (PF_AEQ(naddr, &(sn->raddr), *naf)) {
814 printf("%s: no more addresses\n", __func__);
815 reason = PFRES_MAPFAILED;
816 goto done;
817 }
818
819 pf_addrcpy(naddr, &(sn->raddr), *naf);
820
821 if (nkif)
822 *nkif = sn->rkif;
823 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
824 printf("%s: src tracking maps ", __func__);
825 pf_print_host(saddr, 0, saf);
826 printf(" to ");
827 pf_print_host(naddr, 0, *naf);
828 if (nkif)
829 printf("@%s", (*nkif)->pfik_name);
830 printf("\n");
831 }
832 goto done;
833 }
834
835 /*
836 * Source node has not been found. Find a new address and store it
837 * in variables given by the caller.
838 */
839 if ((reason = pf_map_addr(saf, r, saddr, naddr, nkif, naf, init_addr,
840 rpool)) != 0) {
841 if (V_pf_status.debug >= PF_DEBUG_MISC)
842 printf("%s: pf_map_addr has failed\n", __func__);
843 goto done;
844 }
845
846 if (V_pf_status.debug >= PF_DEBUG_NOISY &&
847 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
848 printf("%s: selected address ", __func__);
849 pf_print_host(naddr, 0, *naf);
850 if (nkif)
851 printf("@%s", (*nkif)->pfik_name);
852 printf("\n");
853 }
854
855 done:
856 if (sn != NULL)
857 PF_SRC_NODE_UNLOCK(sn);
858
859 return (reason);
860 }
861
862 u_short
pf_get_translation(struct pf_test_ctx * ctx)863 pf_get_translation(struct pf_test_ctx *ctx)
864 {
865 struct pf_krule *r = NULL;
866 u_short transerror;
867
868 PF_RULES_RASSERT();
869 KASSERT(ctx->sk == NULL, ("*skp not NULL"));
870 KASSERT(ctx->nk == NULL, ("*nkp not NULL"));
871
872 ctx->nr = NULL;
873
874 if (ctx->pd->dir == PF_OUT) {
875 r = pf_match_translation(PF_RULESET_BINAT, ctx);
876 if (r == NULL)
877 r = pf_match_translation(PF_RULESET_NAT, ctx);
878 } else {
879 r = pf_match_translation(PF_RULESET_RDR, ctx);
880 if (r == NULL)
881 r = pf_match_translation(PF_RULESET_BINAT, ctx);
882 }
883
884 if (r == NULL)
885 return (PFRES_MAX);
886
887 switch (r->action) {
888 case PF_NONAT:
889 case PF_NOBINAT:
890 case PF_NORDR:
891 return (PFRES_MAX);
892 }
893
894 transerror = pf_get_transaddr(ctx, r, r->action, &(r->rdr));
895 if (transerror == PFRES_MATCH)
896 ctx->nr = r;
897
898 return (transerror);
899 }
900
901 u_short
pf_get_transaddr(struct pf_test_ctx * ctx,struct pf_krule * r,uint8_t nat_action,struct pf_kpool * rpool)902 pf_get_transaddr(struct pf_test_ctx *ctx, struct pf_krule *r,
903 uint8_t nat_action, struct pf_kpool *rpool)
904 {
905 struct pf_pdesc *pd = ctx->pd;
906 struct pf_addr *naddr;
907 uint16_t *nportp;
908 uint16_t low, high;
909 u_short reason;
910
911 PF_RULES_RASSERT();
912 KASSERT(r != NULL, ("r is NULL"));
913 KASSERT(!(r->rule_flag & PFRULE_AFTO), ("AFTO rule"));
914
915 if (ctx->sk == NULL && ctx->nk == NULL) {
916 if (pf_state_key_setup(pd, pd->nsport, pd->ndport, &ctx->sk,
917 &ctx->nk))
918 return (PFRES_MEMORY);
919 }
920
921 naddr = &ctx->nk->addr[1];
922 nportp = &ctx->nk->port[1];
923
924 switch (nat_action) {
925 case PF_NAT:
926 if (pd->proto == IPPROTO_ICMP) {
927 low = 1;
928 high = 65535;
929 } else {
930 low = rpool->proxy_port[0];
931 high = rpool->proxy_port[1];
932 }
933 if (rpool->mape.offset > 0) {
934 if (pf_get_mape_sport(pd, r, naddr, nportp,
935 &ctx->udp_mapping, rpool)) {
936 DPFPRINTF(PF_DEBUG_MISC,
937 "pf: MAP-E port allocation (%u/%u/%u)"
938 " failed",
939 rpool->mape.offset,
940 rpool->mape.psidlen,
941 rpool->mape.psid);
942 reason = PFRES_MAPFAILED;
943 goto notrans;
944 }
945 } else if (pf_get_sport(pd, r, naddr, nportp, low, high,
946 rpool, &ctx->udp_mapping, PF_SN_NAT)) {
947 DPFPRINTF(PF_DEBUG_MISC,
948 "pf: NAT proxy port allocation (%u-%u) failed",
949 rpool->proxy_port[0], rpool->proxy_port[1]);
950 reason = PFRES_MAPFAILED;
951 goto notrans;
952 }
953 break;
954 case PF_BINAT:
955 switch (pd->dir) {
956 case PF_OUT:
957 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL){
958 switch (pd->af) {
959 #ifdef INET
960 case AF_INET:
961 if (rpool->cur->addr.p.dyn->
962 pfid_acnt4 < 1) {
963 reason = PFRES_MAPFAILED;
964 goto notrans;
965 }
966 pf_poolmask(naddr,
967 &rpool->cur->addr.p.dyn->pfid_addr4,
968 &rpool->cur->addr.p.dyn->pfid_mask4,
969 &pd->nsaddr, AF_INET);
970 break;
971 #endif /* INET */
972 #ifdef INET6
973 case AF_INET6:
974 if (rpool->cur->addr.p.dyn->
975 pfid_acnt6 < 1) {
976 reason = PFRES_MAPFAILED;
977 goto notrans;
978 }
979 pf_poolmask(naddr,
980 &rpool->cur->addr.p.dyn->pfid_addr6,
981 &rpool->cur->addr.p.dyn->pfid_mask6,
982 &pd->nsaddr, AF_INET6);
983 break;
984 #endif /* INET6 */
985 }
986 } else
987 pf_poolmask(naddr,
988 &rpool->cur->addr.v.a.addr,
989 &rpool->cur->addr.v.a.mask, &pd->nsaddr,
990 pd->af);
991 break;
992 case PF_IN:
993 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
994 switch (pd->af) {
995 #ifdef INET
996 case AF_INET:
997 if (r->src.addr.p.dyn->pfid_acnt4 < 1) {
998 reason = PFRES_MAPFAILED;
999 goto notrans;
1000 }
1001 pf_poolmask(naddr,
1002 &r->src.addr.p.dyn->pfid_addr4,
1003 &r->src.addr.p.dyn->pfid_mask4,
1004 &pd->ndaddr, AF_INET);
1005 break;
1006 #endif /* INET */
1007 #ifdef INET6
1008 case AF_INET6:
1009 if (r->src.addr.p.dyn->pfid_acnt6 < 1) {
1010 reason = PFRES_MAPFAILED;
1011 goto notrans;
1012 }
1013 pf_poolmask(naddr,
1014 &r->src.addr.p.dyn->pfid_addr6,
1015 &r->src.addr.p.dyn->pfid_mask6,
1016 &pd->ndaddr, AF_INET6);
1017 break;
1018 #endif /* INET6 */
1019 }
1020 } else
1021 pf_poolmask(naddr, &r->src.addr.v.a.addr,
1022 &r->src.addr.v.a.mask, &pd->ndaddr, pd->af);
1023 break;
1024 }
1025 break;
1026 case PF_RDR: {
1027 struct pf_state_key_cmp key;
1028 int tries;
1029 uint16_t cut, low, high, nport;
1030
1031 reason = pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr,
1032 &(pd->naf), NULL, NULL, rpool, PF_SN_NAT);
1033
1034 if (reason != 0)
1035 goto notrans;
1036 if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
1037 pf_poolmask(naddr, naddr, &rpool->cur->addr.v.a.mask,
1038 &pd->ndaddr, pd->af);
1039
1040 /* Do not change SCTP ports. */
1041 if (pd->proto == IPPROTO_SCTP)
1042 break;
1043
1044 if (rpool->proxy_port[1]) {
1045 uint32_t tmp_nport;
1046 uint16_t div;
1047
1048 div = r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1;
1049 div = (div == 0) ? 1 : div;
1050
1051 tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % div) +
1052 rpool->proxy_port[0];
1053
1054 /* Wrap around if necessary. */
1055 if (tmp_nport > 65535)
1056 tmp_nport -= 65535;
1057 nport = htons((uint16_t)tmp_nport);
1058 } else if (rpool->proxy_port[0])
1059 nport = htons(rpool->proxy_port[0]);
1060 else
1061 nport = pd->ndport;
1062
1063 /*
1064 * Update the destination port.
1065 */
1066 *nportp = nport;
1067
1068 /*
1069 * Do we have a source port conflict in the stack state? Try to
1070 * modulate the source port if so. Note that this is racy since
1071 * the state lookup may not find any matches here but will once
1072 * pf_create_state() actually instantiates the state.
1073 */
1074 bzero(&key, sizeof(key));
1075 key.af = pd->af;
1076 key.proto = pd->proto;
1077 key.port[0] = pd->nsport;
1078 pf_addrcpy(&key.addr[0], &pd->nsaddr, key.af);
1079 key.port[1] = nport;
1080 pf_addrcpy(&key.addr[1], naddr, key.af);
1081
1082 if (!pf_find_state_all_exists(&key, PF_OUT))
1083 break;
1084
1085 tries = 0;
1086
1087 low = 50001; /* XXX-MJ PF_NAT_PROXY_PORT_LOW/HIGH */
1088 high = 65535;
1089 cut = arc4random() % (1 + high - low) + low;
1090 for (uint32_t tmp = cut;
1091 tmp <= high && tmp <= UINT16_MAX &&
1092 tries < V_pf_rdr_srcport_rewrite_tries;
1093 tmp++, tries++) {
1094 key.port[0] = htons(tmp);
1095 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1096 /* Update the source port. */
1097 ctx->nk->port[0] = htons(tmp);
1098 goto out;
1099 }
1100 }
1101 for (uint32_t tmp = cut - 1;
1102 tmp >= low && tries < V_pf_rdr_srcport_rewrite_tries;
1103 tmp--, tries++) {
1104 key.port[0] = htons(tmp);
1105 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1106 /* Update the source port. */
1107 ctx->nk->port[0] = htons(tmp);
1108 goto out;
1109 }
1110 }
1111
1112 /*
1113 * We failed to find a match. Push on ahead anyway, let
1114 * pf_state_insert() be the arbiter of whether the state
1115 * conflict is tolerable. In particular, with TCP connections
1116 * the state may be reused if the TCP state is terminal.
1117 */
1118 DPFPRINTF(PF_DEBUG_MISC,
1119 "pf: RDR source port allocation failed");
1120 break;
1121
1122 out:
1123 DPFPRINTF(PF_DEBUG_MISC,
1124 "pf: RDR source port allocation %u->%u",
1125 ntohs(pd->nsport), ntohs(ctx->nk->port[0]));
1126 break;
1127 }
1128 default:
1129 panic("%s: unknown action %u", __func__, r->action);
1130 }
1131
1132 /* Return success only if translation really happened. */
1133 if (bcmp(ctx->sk, ctx->nk, sizeof(struct pf_state_key_cmp))) {
1134 return (PFRES_MATCH);
1135 }
1136
1137 reason = PFRES_MAX;
1138 notrans:
1139 uma_zfree(V_pf_state_key_z, ctx->nk);
1140 uma_zfree(V_pf_state_key_z, ctx->sk);
1141 ctx->sk = ctx->nk = NULL;
1142
1143 return (reason);
1144 }
1145
1146 int
pf_get_transaddr_af(struct pf_krule * r,struct pf_pdesc * pd)1147 pf_get_transaddr_af(struct pf_krule *r, struct pf_pdesc *pd)
1148 {
1149 #if defined(INET) && defined(INET6)
1150 struct pf_addr ndaddr, nsaddr, naddr;
1151 u_int16_t nport = 0;
1152 int prefixlen = 96;
1153
1154 bzero(&nsaddr, sizeof(nsaddr));
1155 bzero(&ndaddr, sizeof(ndaddr));
1156
1157 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1158 printf("pf: af-to %s %s, ",
1159 pd->naf == AF_INET ? "inet" : "inet6",
1160 TAILQ_EMPTY(&r->rdr.list) ? "nat" : "rdr");
1161 pf_print_host(&pd->nsaddr, pd->nsport, pd->af);
1162 printf(" -> ");
1163 pf_print_host(&pd->ndaddr, pd->ndport, pd->af);
1164 printf("\n");
1165 }
1166
1167 if (TAILQ_EMPTY(&r->nat.list))
1168 panic("pf_get_transaddr_af: no nat pool for source address");
1169
1170 /* get source address and port */
1171 if (pf_get_sport(pd, r, &nsaddr, &nport, r->nat.proxy_port[0],
1172 r->nat.proxy_port[1], &r->nat, NULL, PF_SN_NAT)) {
1173 DPFPRINTF(PF_DEBUG_MISC,
1174 "pf: af-to NAT proxy port allocation (%u-%u) failed",
1175 r->nat.proxy_port[0], r->nat.proxy_port[1]);
1176 return (-1);
1177 }
1178
1179 if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) {
1180 pd->ndport = ntohs(pd->ndport);
1181 if (pd->ndport == ICMP6_ECHO_REQUEST)
1182 pd->ndport = ICMP_ECHO;
1183 else if (pd->ndport == ICMP6_ECHO_REPLY)
1184 pd->ndport = ICMP_ECHOREPLY;
1185 pd->ndport = htons(pd->ndport);
1186 } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) {
1187 pd->nsport = ntohs(pd->nsport);
1188 if (pd->ndport == ICMP_ECHO)
1189 pd->ndport = ICMP6_ECHO_REQUEST;
1190 else if (pd->ndport == ICMP_ECHOREPLY)
1191 pd->ndport = ICMP6_ECHO_REPLY;
1192 pd->nsport = htons(pd->nsport);
1193 }
1194
1195 /* get the destination address and port */
1196 if (! TAILQ_EMPTY(&r->rdr.list)) {
1197 if (pf_map_addr_sn(pd->naf, r, &nsaddr, &naddr, &(pd->naf),
1198 NULL, NULL, &r->rdr, PF_SN_NAT))
1199 return (-1);
1200 if (r->rdr.proxy_port[0])
1201 pd->ndport = htons(r->rdr.proxy_port[0]);
1202
1203 if (pd->naf == AF_INET) {
1204 /* The prefix is the IPv4 rdr address */
1205 prefixlen = in_mask2len(
1206 (struct in_addr *)&r->rdr.cur->addr.v.a.mask);
1207 inet_nat46(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1208 prefixlen);
1209 } else {
1210 /* The prefix is the IPv6 rdr address */
1211 prefixlen = in6_mask2len(
1212 (struct in6_addr *)&r->rdr.cur->addr.v.a.mask, NULL);
1213 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1214 prefixlen);
1215 }
1216 } else {
1217 if (pd->naf == AF_INET) {
1218 /* The prefix is the IPv6 dst address */
1219 prefixlen = in6_mask2len(
1220 (struct in6_addr *)&r->dst.addr.v.a.mask, NULL);
1221 if (prefixlen < 32)
1222 prefixlen = 96;
1223 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &pd->ndaddr,
1224 prefixlen);
1225 } else {
1226 /*
1227 * The prefix is the IPv6 nat address
1228 * (that was stored in pd->nsaddr)
1229 */
1230 prefixlen = in6_mask2len(
1231 (struct in6_addr *)&r->nat.cur->addr.v.a.mask, NULL);
1232 if (prefixlen > 96)
1233 prefixlen = 96;
1234 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &nsaddr,
1235 prefixlen);
1236 }
1237 }
1238
1239 pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf);
1240 pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf);
1241
1242 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1243 printf("pf: af-to %s done, prefixlen %d, ",
1244 pd->naf == AF_INET ? "inet" : "inet6",
1245 prefixlen);
1246 pf_print_host(&pd->nsaddr, pd->nsport, pd->naf);
1247 printf(" -> ");
1248 pf_print_host(&pd->ndaddr, pd->ndport, pd->naf);
1249 printf("\n");
1250 }
1251
1252 return (0);
1253 #else
1254 return (-1);
1255 #endif
1256 }
1257