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 break;
220 } else {
221 ctx->a = r; /* remember anchor */
222 ctx->aruleset = ruleset; /* and its ruleset */
223 if (pf_step_into_translation_anchor(rs_num, ctx,
224 r) != PF_TEST_OK) {
225 break;
226 }
227 }
228 r = TAILQ_NEXT(r, entries);
229 }
230
231 if (ctx->tag > 0 && pf_tag_packet(pd, ctx->tag))
232 return (PF_TEST_FAIL);
233 if (rtableid >= 0)
234 M_SETFIB(pd->m, rtableid);
235
236 return (PF_TEST_OK);
237 }
238
239 static enum pf_test_status
pf_step_into_translation_anchor(int rs_num,struct pf_test_ctx * ctx,struct pf_krule * r)240 pf_step_into_translation_anchor(int rs_num, struct pf_test_ctx *ctx, struct pf_krule *r)
241 {
242 enum pf_test_status rv;
243
244 PF_RULES_RASSERT();
245
246 if (ctx->depth >= PF_ANCHOR_STACK_MAX) {
247 printf("%s: anchor stack overflow on %s\n",
248 __func__, r->anchor->name);
249 return (PF_TEST_FAIL);
250 }
251
252 ctx->depth++;
253
254 if (r->anchor_wildcard) {
255 struct pf_kanchor *child;
256 rv = PF_TEST_OK;
257 RB_FOREACH(child, pf_kanchor_node, &r->anchor->children) {
258 rv = pf_match_translation_rule(rs_num, ctx, &child->ruleset);
259 if ((rv == PF_TEST_QUICK) || (rv == PF_TEST_FAIL)) {
260 /*
261 * we either hit a rule qith quick action
262 * (more likely), or hit some runtime
263 * error (e.g. pool_get() faillure).
264 */
265 break;
266 }
267 }
268 } else {
269 rv = pf_match_translation_rule(rs_num, ctx, &r->anchor->ruleset);
270 }
271
272 ctx->depth--;
273
274 return (rv);
275 }
276
277 static struct pf_krule *
pf_match_translation(int rs_num,struct pf_test_ctx * ctx)278 pf_match_translation(int rs_num, struct pf_test_ctx *ctx)
279 {
280 enum pf_test_status rv;
281
282 MPASS(ctx->depth == 0);
283 rv = pf_match_translation_rule(rs_num, ctx, &pf_main_ruleset);
284 MPASS(ctx->depth == 0);
285 if (rv != PF_TEST_OK)
286 return (NULL);
287
288 return (ctx->tr);
289 }
290
291 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)292 pf_get_sport(struct pf_pdesc *pd, struct pf_krule *r, struct pf_addr *naddr,
293 uint16_t *nport, uint16_t low, uint16_t high, struct pf_kpool *rpool,
294 struct pf_udp_mapping **udp_mapping, pf_sn_types_t sn_type)
295 {
296 struct pf_state_key_cmp key;
297 struct pf_addr init_addr;
298 int dir = (pd->dir == PF_IN) ? PF_OUT : PF_IN;
299 int sidx = pd->sidx;
300 int didx = pd->didx;
301
302 bzero(&init_addr, sizeof(init_addr));
303
304 MPASS(udp_mapping == NULL ||
305 *udp_mapping == NULL);
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 MPASS(udp_mapping == NULL ||
358 *udp_mapping == NULL);
359 return (0); /* Don't try to modify non-echo ICMP */
360 }
361 }
362 #ifdef INET6
363 if (pd->proto == IPPROTO_ICMPV6) {
364 if (pd->ndport == htons(ICMP6_ECHO_REQUEST)) {
365 low = 1;
366 high = 65535;
367 } else {
368 MPASS(udp_mapping == NULL ||
369 *udp_mapping == NULL);
370 return (0); /* Don't try to modify non-echo ICMP */
371 }
372 }
373 #endif /* INET6 */
374
375 bzero(&key, sizeof(key));
376 key.af = pd->naf;
377 key.proto = pd->proto;
378
379 do {
380 pf_addrcpy(&key.addr[didx], &pd->ndaddr, key.af);
381 pf_addrcpy(&key.addr[sidx], naddr, key.af);
382 key.port[didx] = pd->ndport;
383
384 if (udp_mapping && *udp_mapping)
385 pf_addrcpy(&(*udp_mapping)->endpoints[1].addr, naddr,
386 pd->af);
387
388 /*
389 * port search; start random, step;
390 * similar 2 portloop in in_pcbbind
391 */
392 if (pd->proto == IPPROTO_SCTP) {
393 key.port[sidx] = pd->nsport;
394 MPASS(udp_mapping == NULL ||
395 *udp_mapping == NULL);
396 if (!pf_find_state_all_exists(&key, dir)) {
397 *nport = pd->nsport;
398 return (0);
399 } else {
400 return (1); /* Fail mapping. */
401 }
402 } else if (!(pd->proto == IPPROTO_TCP || pd->proto == IPPROTO_UDP ||
403 pd->proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
404 /*
405 * XXX bug: icmp states don't use the id on both sides.
406 * (traceroute -I through nat)
407 */
408 key.port[sidx] = pd->nsport;
409 if (!pf_find_state_all_exists(&key, dir)) {
410 MPASS(udp_mapping == NULL ||
411 *udp_mapping == NULL);
412 *nport = pd->nsport;
413 return (0);
414 }
415 } else if (low == high) {
416 key.port[sidx] = htons(low);
417 if (!pf_find_state_all_exists(&key, dir)) {
418 if (udp_mapping && *udp_mapping != NULL) {
419 (*udp_mapping)->endpoints[1].port = htons(low);
420 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
421 *nport = htons(low);
422 return (0);
423 }
424 } else {
425 MPASS(udp_mapping == NULL ||
426 *udp_mapping == NULL);
427 *nport = htons(low);
428 return (0);
429 }
430 }
431 } else {
432 uint32_t tmp;
433 uint16_t cut;
434
435 if (low > high) {
436 tmp = low;
437 low = high;
438 high = tmp;
439 }
440 /* low < high */
441 cut = arc4random() % (1 + high - low) + low;
442 /* low <= cut <= high */
443 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
444 if (udp_mapping && *udp_mapping != NULL) {
445 (*udp_mapping)->endpoints[sidx].port = htons(tmp);
446 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
447 *nport = htons(tmp);
448 return (0);
449 }
450 } else {
451 key.port[sidx] = htons(tmp);
452 if (!pf_find_state_all_exists(&key, dir)) {
453 *nport = htons(tmp);
454 MPASS(udp_mapping == NULL ||
455 *udp_mapping == NULL);
456 return (0);
457 }
458 }
459 }
460 tmp = cut;
461 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
462 if (pd->proto == IPPROTO_UDP &&
463 (rpool->opts & PF_POOL_ENDPI &&
464 udp_mapping != NULL)) {
465 (*udp_mapping)->endpoints[1].port = htons(tmp);
466 if (pf_udp_mapping_insert(*udp_mapping) == 0) {
467 *nport = htons(tmp);
468 return (0);
469 }
470 } else {
471 key.port[sidx] = htons(tmp);
472 if (!pf_find_state_all_exists(&key, dir)) {
473 MPASS(udp_mapping == NULL ||
474 *udp_mapping == NULL);
475 *nport = htons(tmp);
476 return (0);
477 }
478 }
479 }
480 }
481
482 switch (rpool->opts & PF_POOL_TYPEMASK) {
483 case PF_POOL_RANDOM:
484 case PF_POOL_ROUNDROBIN:
485 /*
486 * pick a different source address since we're out
487 * of free port choices for the current one.
488 */
489 if (pf_map_addr_sn(pd->naf, r, &pd->nsaddr, naddr,
490 &(pd->naf), NULL, &init_addr, rpool, sn_type))
491 goto failed;
492 break;
493 case PF_POOL_NONE:
494 case PF_POOL_SRCHASH:
495 case PF_POOL_BITMASK:
496 default:
497 goto failed;
498 }
499 } while (! PF_AEQ(&init_addr, naddr, pd->naf) );
500
501 failed:
502 if (udp_mapping) {
503 uma_zfree(V_pf_udp_mapping_z, *udp_mapping);
504 *udp_mapping = NULL;
505 }
506
507 return (1); /* none available */
508 }
509
510 static bool
pf_islinklocal(const sa_family_t af,const struct pf_addr * addr)511 pf_islinklocal(const sa_family_t af, const struct pf_addr *addr)
512 {
513 if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&addr->v6))
514 return (true);
515 return (false);
516 }
517
518 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)519 pf_get_mape_sport(struct pf_pdesc *pd, struct pf_krule *r,
520 struct pf_addr *naddr, uint16_t *nport, struct pf_udp_mapping **udp_mapping,
521 struct pf_kpool *rpool)
522 {
523 uint16_t psmask, low, highmask;
524 uint16_t i, ahigh, cut;
525 int ashift, psidshift;
526
527 ashift = 16 - rpool->mape.offset;
528 psidshift = ashift - rpool->mape.psidlen;
529 psmask = rpool->mape.psid & ((1U << rpool->mape.psidlen) - 1);
530 psmask = psmask << psidshift;
531 highmask = (1U << psidshift) - 1;
532
533 ahigh = (1U << rpool->mape.offset) - 1;
534 cut = arc4random() & ahigh;
535 if (cut == 0)
536 cut = 1;
537
538 for (i = cut; i <= ahigh; i++) {
539 low = (i << ashift) | psmask;
540 if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask,
541 rpool, udp_mapping, PF_SN_NAT))
542 return (0);
543 }
544 for (i = cut - 1; i > 0; i--) {
545 low = (i << ashift) | psmask;
546 if (!pf_get_sport(pd, r, naddr, nport, low, low | highmask,
547 rpool, udp_mapping, PF_SN_NAT))
548 return (0);
549 }
550 return (1);
551 }
552
553 static __inline u_short
pf_check_src_node_valid(struct pf_ksrc_node * sn,struct pf_kpool * rpool)554 pf_check_src_node_valid(struct pf_ksrc_node *sn, struct pf_kpool *rpool)
555 {
556 struct pf_addr *raddr, *rmask;
557 struct pf_addr *caddr; /* cached redirection address */
558 struct pf_kpooladdr *pa;
559 sa_family_t raf;
560 sa_family_t caf; /* cached redirection AF */
561 u_short valid = 0;
562
563 KASSERT(sn != NULL, ("sn is NULL"));
564 KASSERT(rpool != NULL, ("rpool is NULL"));
565
566 /* check if the cached entry is still valid */
567
568 if (sn->type == PF_SN_LIMIT) {
569 /* Always valid as it does not store redirection address */
570 return (1);
571 }
572
573 mtx_lock(&rpool->mtx);
574 caddr = &(sn->raddr);
575 caf = sn->raf;
576
577 TAILQ_FOREACH(pa, &rpool->list, entries) {
578 if (PF_AZERO(caddr, caf)) {
579 valid = 1;
580 goto done;
581 } else if (pa->addr.type == PF_ADDR_DYNIFTL) {
582 if (pfr_kentry_byaddr(pa->addr.p.dyn->pfid_kt, caddr, caf, 0)) {
583 valid = 1;
584 goto done;
585 }
586 } else if (pa->addr.type == PF_ADDR_TABLE) {
587 if (pfr_kentry_byaddr(pa->addr.p.tbl, caddr, caf, 0)) {
588 valid = 1;
589 goto done;
590 }
591 } else if (pa->addr.type != PF_ADDR_NOROUTE) {
592 /* PF_ADDR_URPFFAILED, PF_ADDR_RANGE, PF_ADDR_ADDRMASK */
593 raddr = &(pa->addr.v.a.addr);
594 rmask = &(pa->addr.v.a.mask);
595 raf = pa->af;
596 if (raf == caf && pf_match_addr(0, raddr, rmask, caddr, caf)) {
597 valid = 1;
598 goto done;
599 }
600 }
601 /* else PF_ADDR_NOROUTE */
602 }
603
604 done:
605 mtx_unlock(&rpool->mtx);
606
607 return (valid);
608 }
609
610 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)611 pf_map_addr(sa_family_t saf, struct pf_krule *r, struct pf_addr *saddr,
612 struct pf_addr *naddr, struct pfi_kkif **nkif, sa_family_t *naf,
613 struct pf_addr *init_addr, struct pf_kpool *rpool)
614 {
615 u_short reason = PFRES_MATCH;
616 struct pf_addr *raddr = NULL, *rmask = NULL;
617 struct pfr_ktable *kt;
618 uint64_t hashidx;
619 int cnt;
620 sa_family_t wanted_af;
621 u_int8_t pool_type;
622 bool prefer_ipv6_nexthop = rpool->opts & PF_POOL_IPV6NH;
623
624 KASSERT(saf != 0, ("%s: saf == 0", __func__));
625 KASSERT(naf != NULL, ("%s: naf = NULL", __func__));
626 KASSERT((*naf) != 0, ("%s: *naf = 0", __func__));
627
628 /*
629 * Given (*naf) is a hint about AF of the forwarded packet.
630 * It might be changed if prefer_ipv6_nexthop is enabled and
631 * the combination of nexthop AF and packet AF allows for it.
632 */
633 wanted_af = (*naf);
634
635 mtx_lock(&rpool->mtx);
636 /* Find the route using chosen algorithm. Store the found route
637 in src_node if it was given or found. */
638 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) {
639 reason = PFRES_MAPFAILED;
640 goto done_pool_mtx;
641 }
642 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
643 switch (wanted_af) {
644 #ifdef INET
645 case AF_INET:
646 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
647 !PF_POOL_DYNTYPE(rpool->opts)) {
648 reason = PFRES_MAPFAILED;
649 goto done_pool_mtx;
650 }
651 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
652 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
653 break;
654 #endif /* INET */
655 #ifdef INET6
656 case AF_INET6:
657 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
658 !PF_POOL_DYNTYPE(rpool->opts)) {
659 reason = PFRES_MAPFAILED;
660 goto done_pool_mtx;
661 }
662 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
663 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
664 break;
665 #endif /* INET6 */
666 default:
667 unhandled_af(wanted_af);
668 }
669 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
670 if (!PF_POOL_DYNTYPE(rpool->opts)) {
671 reason = PFRES_MAPFAILED;
672 goto done_pool_mtx; /* unsupported */
673 }
674 } else {
675 raddr = &rpool->cur->addr.v.a.addr;
676 rmask = &rpool->cur->addr.v.a.mask;
677 }
678
679 /*
680 * For pools with a single host with the prefer-ipv6-nexthop option
681 * we can return pool address of any AF, unless the forwarded packet
682 * is IPv6, then we can return only if pool address is IPv6.
683 * For non-prefer-ipv6-nexthop we can return pool address only
684 * of wanted AF, unless the pool address'es AF is unknown, which
685 * happens in case old ioctls have been used to set up the pool.
686 *
687 * Round-robin pools have their own logic for retrying next addresses.
688 */
689 pool_type = rpool->opts & PF_POOL_TYPEMASK;
690 if (pool_type == PF_POOL_NONE || pool_type == PF_POOL_BITMASK ||
691 ((pool_type == PF_POOL_RANDOM || pool_type == PF_POOL_SRCHASH) &&
692 rpool->cur->addr.type != PF_ADDR_TABLE &&
693 rpool->cur->addr.type != PF_ADDR_DYNIFTL)) {
694 if (prefer_ipv6_nexthop) {
695 if (rpool->cur->af == AF_INET && (*naf) == AF_INET6) {
696 reason = PFRES_MAPFAILED;
697 goto done_pool_mtx;
698 }
699 wanted_af = rpool->cur->af;
700 } else {
701 if (rpool->cur->af != 0 && rpool->cur->af != (*naf)) {
702 reason = PFRES_MAPFAILED;
703 goto done_pool_mtx;
704 }
705 }
706 }
707
708 switch (pool_type) {
709 case PF_POOL_NONE:
710 pf_addrcpy(naddr, raddr, wanted_af);
711 break;
712 case PF_POOL_BITMASK:
713 pf_poolmask(naddr, raddr, rmask, saddr, wanted_af);
714 break;
715 case PF_POOL_RANDOM:
716 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
717 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
718 if (rpool->cur->addr.type == PF_ADDR_TABLE)
719 kt = rpool->cur->addr.p.tbl;
720 else
721 kt = rpool->cur->addr.p.dyn->pfid_kt;
722 kt = pfr_ktable_select_active(kt);
723 if (kt == NULL) {
724 reason = PFRES_MAPFAILED;
725 goto done_pool_mtx; /* unsupported */
726 }
727 cnt = kt->pfrkt_cnt;
728 if (cnt == 0)
729 rpool->tblidx = 0;
730 else
731 rpool->tblidx = (int)arc4random_uniform(cnt);
732 memset(&rpool->counter, 0, sizeof(rpool->counter));
733 if (prefer_ipv6_nexthop)
734 wanted_af = AF_INET6;
735 retry_other_af_random:
736 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
737 wanted_af, pf_islinklocal, false)) {
738 /* Retry with IPv4 nexthop for IPv4 traffic */
739 if (prefer_ipv6_nexthop &&
740 wanted_af == AF_INET6 &&
741 (*naf) == AF_INET) {
742 wanted_af = AF_INET;
743 goto retry_other_af_random;
744 } else {
745 /* no hosts in wanted AF */
746 reason = PFRES_MAPFAILED;
747 goto done_pool_mtx;
748 }
749 }
750 pf_addrcpy(naddr, &rpool->counter, wanted_af);
751 } else if (init_addr != NULL && PF_AZERO(init_addr,
752 wanted_af)) {
753 switch (wanted_af) {
754 #ifdef INET
755 case AF_INET:
756 rpool->counter.addr32[0] = arc4random();
757 break;
758 #endif /* INET */
759 #ifdef INET6
760 case AF_INET6:
761 if (rmask->addr32[3] != 0xffffffff)
762 rpool->counter.addr32[3] =
763 arc4random();
764 else
765 break;
766 if (rmask->addr32[2] != 0xffffffff)
767 rpool->counter.addr32[2] =
768 arc4random();
769 else
770 break;
771 if (rmask->addr32[1] != 0xffffffff)
772 rpool->counter.addr32[1] =
773 arc4random();
774 else
775 break;
776 if (rmask->addr32[0] != 0xffffffff)
777 rpool->counter.addr32[0] =
778 arc4random();
779 break;
780 #endif /* INET6 */
781 }
782 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
783 wanted_af);
784 pf_addrcpy(init_addr, naddr, wanted_af);
785
786 } else {
787 pf_addr_inc(&rpool->counter, wanted_af);
788 pf_poolmask(naddr, raddr, rmask, &rpool->counter,
789 wanted_af);
790 }
791 break;
792 case PF_POOL_SRCHASH:
793 {
794 unsigned char hash[16];
795
796 hashidx =
797 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key,
798 wanted_af);
799 if (rpool->cur->addr.type == PF_ADDR_TABLE ||
800 rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
801 if (rpool->cur->addr.type == PF_ADDR_TABLE)
802 kt = rpool->cur->addr.p.tbl;
803 else
804 kt = rpool->cur->addr.p.dyn->pfid_kt;
805 kt = pfr_ktable_select_active(kt);
806 if (kt == NULL) {
807 reason = PFRES_MAPFAILED;
808 goto done_pool_mtx; /* unsupported */
809 }
810 cnt = kt->pfrkt_cnt;
811 if (cnt == 0)
812 rpool->tblidx = 0;
813 else
814 rpool->tblidx = (int)(hashidx % cnt);
815 memset(&rpool->counter, 0, sizeof(rpool->counter));
816 if (prefer_ipv6_nexthop)
817 wanted_af = AF_INET6;
818 retry_other_af_srchash:
819 if (pfr_pool_get(kt, &rpool->tblidx, &rpool->counter,
820 wanted_af, pf_islinklocal, false)) {
821 /* Retry with IPv4 nexthop for IPv4 traffic */
822 if (prefer_ipv6_nexthop &&
823 wanted_af == AF_INET6 &&
824 (*naf) == AF_INET) {
825 wanted_af = AF_INET;
826 goto retry_other_af_srchash;
827 } else {
828 /* no hosts in wanted AF */
829 reason = PFRES_MAPFAILED;
830 goto done_pool_mtx;
831 }
832 }
833 pf_addrcpy(naddr, &rpool->counter, wanted_af);
834 } else {
835 pf_poolmask(naddr, raddr, rmask,
836 (struct pf_addr *)&hash, wanted_af);
837 }
838 break;
839 }
840 case PF_POOL_ROUNDROBIN:
841 {
842 struct pf_kpooladdr *acur = rpool->cur;
843
844 retry_other_af_rr:
845 if (prefer_ipv6_nexthop)
846 wanted_af = rpool->ipv6_nexthop_af;
847 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
848 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
849 &rpool->tblidx, &rpool->counter, wanted_af,
850 NULL, true))
851 goto get_addr;
852 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
853 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
854 &rpool->tblidx, &rpool->counter, wanted_af,
855 pf_islinklocal, true))
856 goto get_addr;
857 } else if (rpool->cur->af == wanted_af &&
858 pf_match_addr(0, raddr, rmask, &rpool->counter, wanted_af))
859 goto get_addr;
860 if (prefer_ipv6_nexthop &&
861 (*naf) == AF_INET && wanted_af == AF_INET6) {
862 /* Reset table index when changing wanted AF. */
863 rpool->tblidx = -1;
864 rpool->ipv6_nexthop_af = AF_INET;
865 goto retry_other_af_rr;
866 }
867 try_next:
868 /* Reset prefer-ipv6-nexthop search to IPv6 when iterating pools. */
869 rpool->ipv6_nexthop_af = AF_INET6;
870 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
871 rpool->cur = TAILQ_FIRST(&rpool->list);
872 else
873 rpool->cur = TAILQ_NEXT(rpool->cur, entries);
874 try_next_ipv6_nexthop_rr:
875 /* Reset table index when iterating pools or changing wanted AF. */
876 rpool->tblidx = -1;
877 if (prefer_ipv6_nexthop)
878 wanted_af = rpool->ipv6_nexthop_af;
879 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
880 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
881 &rpool->tblidx, &rpool->counter, wanted_af, NULL,
882 true))
883 goto get_addr;
884 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
885 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
886 &rpool->tblidx, &rpool->counter, wanted_af, pf_islinklocal,
887 true))
888 goto get_addr;
889 } else {
890 if (rpool->cur->af == wanted_af) {
891 raddr = &rpool->cur->addr.v.a.addr;
892 rmask = &rpool->cur->addr.v.a.mask;
893 pf_addrcpy(&rpool->counter, raddr, wanted_af);
894 goto get_addr;
895 }
896 }
897 if (prefer_ipv6_nexthop &&
898 (*naf) == AF_INET && wanted_af == AF_INET6) {
899 rpool->ipv6_nexthop_af = AF_INET;
900 goto try_next_ipv6_nexthop_rr;
901 }
902 if (rpool->cur != acur)
903 goto try_next;
904 reason = PFRES_MAPFAILED;
905 goto done_pool_mtx;
906 get_addr:
907 pf_addrcpy(naddr, &rpool->counter, wanted_af);
908 if (init_addr != NULL && PF_AZERO(init_addr, wanted_af))
909 pf_addrcpy(init_addr, naddr, wanted_af);
910 pf_addr_inc(&rpool->counter, wanted_af);
911 break;
912 }
913 }
914
915 if (wanted_af == 0) {
916 reason = PFRES_MAPFAILED;
917 goto done_pool_mtx;
918 }
919
920 if (nkif)
921 *nkif = rpool->cur->kif;
922
923 (*naf) = wanted_af;
924
925 done_pool_mtx:
926 mtx_unlock(&rpool->mtx);
927
928 return (reason);
929 }
930
931 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)932 pf_map_addr_sn(sa_family_t saf, struct pf_krule *r, struct pf_addr *saddr,
933 struct pf_addr *naddr, sa_family_t *naf, struct pfi_kkif **nkif,
934 struct pf_addr *init_addr, struct pf_kpool *rpool, pf_sn_types_t sn_type)
935 {
936 struct pf_ksrc_node *sn = NULL;
937 struct pf_srchash *sh = NULL;
938 u_short reason = 0;
939
940 /*
941 * If this is a sticky-address rule, try to find an existing src_node.
942 */
943 if (rpool->opts & PF_POOL_STICKYADDR &&
944 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
945 sn = pf_find_src_node(saddr, r, saf, &sh, sn_type, false);
946
947 if (sn != NULL) {
948 PF_SRC_NODE_LOCK_ASSERT(sn);
949 /*
950 * Check if source node's redirection address still exists
951 * in pool from which the SN was created. If not, delete it.
952 * Similar to pf_kill_srcnodes(). Unlink the source node
953 * from tree, unlink it from states, then free it. Do not
954 * overlap source node and state locks to avoid LOR.
955 */
956 if (!pf_check_src_node_valid(sn, rpool)) {
957 pf_unlink_src_node(sn);
958 PF_SRC_NODE_UNLOCK(sn);
959 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
960 printf("%s: stale src tracking (%d) ",
961 __func__, sn_type);
962 pf_print_host(saddr, 0, saf);
963 printf(" to ");
964 pf_print_host(&(sn->raddr), 0, sn->raf);
965 if (nkif)
966 printf("@%s", sn->rkif->pfik_name);
967 printf("\n");
968 }
969
970 for (int i = 0; i <= V_pf_hashmask; i++) {
971 struct pf_idhash *ih = &V_pf_idhash[i];
972 struct pf_kstate *st;
973
974 PF_HASHROW_LOCK(ih);
975 LIST_FOREACH(st, &ih->states, entry) {
976 if (st->sns[sn->type] == sn) {
977 st->sns[sn->type] = NULL;
978 }
979 }
980 PF_HASHROW_UNLOCK(ih);
981 }
982 pf_free_src_node(sn);
983 counter_u64_add(V_pf_status.scounters[SCNT_SRC_NODE_REMOVALS], 1);
984 sn = NULL;
985 goto map_addr;
986 }
987
988 (*naf) = sn->raf;
989
990 /* If the supplied address is the same as the current one we've
991 * been asked before, so tell the caller that there's no other
992 * address to be had. */
993
994 if (PF_AEQ(naddr, &(sn->raddr), *naf)) {
995 printf("%s: no more addresses\n", __func__);
996 reason = PFRES_MAPFAILED;
997 goto done;
998 }
999
1000 pf_addrcpy(naddr, &(sn->raddr), *naf);
1001
1002 if (nkif)
1003 *nkif = sn->rkif;
1004 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
1005 printf("%s: src tracking maps ", __func__);
1006 pf_print_host(saddr, 0, saf);
1007 printf(" to ");
1008 pf_print_host(naddr, 0, *naf);
1009 if (nkif)
1010 printf("@%s", (*nkif)->pfik_name);
1011 printf("\n");
1012 }
1013 goto done;
1014 }
1015
1016 map_addr:
1017 /*
1018 * Source node has not been found or is invalid. Find a new address
1019 * and store it in variables given by the caller.
1020 */
1021 if ((reason = pf_map_addr(saf, r, saddr, naddr, nkif, naf, init_addr,
1022 rpool)) != 0) {
1023 if (V_pf_status.debug >= PF_DEBUG_MISC)
1024 printf("%s: pf_map_addr has failed\n", __func__);
1025 goto done;
1026 }
1027
1028 if (V_pf_status.debug >= PF_DEBUG_NOISY &&
1029 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
1030 printf("%s: selected address ", __func__);
1031 pf_print_host(naddr, 0, *naf);
1032 if (nkif)
1033 printf("@%s", (*nkif)->pfik_name);
1034 printf("\n");
1035 }
1036
1037 done:
1038 if (sn != NULL)
1039 PF_SRC_NODE_UNLOCK(sn);
1040
1041 return (reason);
1042 }
1043
1044 u_short
pf_get_translation(struct pf_test_ctx * ctx)1045 pf_get_translation(struct pf_test_ctx *ctx)
1046 {
1047 struct pf_krule *r = NULL;
1048 u_short transerror;
1049
1050 PF_RULES_RASSERT();
1051 KASSERT(ctx->sk == NULL, ("*skp not NULL"));
1052 KASSERT(ctx->nk == NULL, ("*nkp not NULL"));
1053
1054 ctx->nr = NULL;
1055
1056 if (ctx->pd->dir == PF_OUT) {
1057 r = pf_match_translation(PF_RULESET_BINAT, ctx);
1058 if (r == NULL)
1059 r = pf_match_translation(PF_RULESET_NAT, ctx);
1060 } else {
1061 r = pf_match_translation(PF_RULESET_RDR, ctx);
1062 if (r == NULL)
1063 r = pf_match_translation(PF_RULESET_BINAT, ctx);
1064 }
1065
1066 if (r == NULL)
1067 return (PFRES_MAX);
1068
1069 switch (r->action) {
1070 case PF_NONAT:
1071 case PF_NOBINAT:
1072 case PF_NORDR:
1073 return (PFRES_MAX);
1074 }
1075
1076 transerror = pf_get_transaddr(ctx, r, r->action, &(r->rdr));
1077 if (transerror == PFRES_MATCH)
1078 ctx->nr = r;
1079
1080 return (transerror);
1081 }
1082
1083 u_short
pf_get_transaddr(struct pf_test_ctx * ctx,struct pf_krule * r,uint8_t nat_action,struct pf_kpool * rpool)1084 pf_get_transaddr(struct pf_test_ctx *ctx, struct pf_krule *r,
1085 uint8_t nat_action, struct pf_kpool *rpool)
1086 {
1087 struct pf_pdesc *pd = ctx->pd;
1088 struct pf_addr *naddr;
1089 int idx;
1090 uint16_t *nportp;
1091 uint16_t low, high;
1092 u_short reason;
1093
1094 PF_RULES_RASSERT();
1095 KASSERT(r != NULL, ("r is NULL"));
1096 KASSERT(!(r->rule_flag & PFRULE_AFTO), ("AFTO rule"));
1097
1098 if (ctx->sk == NULL && ctx->nk == NULL) {
1099 if (pf_state_key_setup(pd, pd->nsport, pd->ndport, &ctx->sk,
1100 &ctx->nk))
1101 return (PFRES_MEMORY);
1102 }
1103
1104 switch (nat_action) {
1105 case PF_NAT:
1106 idx = pd->sidx;
1107 break;
1108 case PF_BINAT:
1109 idx = 1;
1110 break;
1111 case PF_RDR:
1112 idx = pd->didx;
1113 break;
1114 }
1115 naddr = &ctx->nk->addr[idx];
1116 nportp = &ctx->nk->port[idx];
1117
1118 switch (nat_action) {
1119 case PF_NAT:
1120 if (pd->proto == IPPROTO_ICMP) {
1121 low = 1;
1122 high = 65535;
1123 } else {
1124 low = rpool->proxy_port[0];
1125 high = rpool->proxy_port[1];
1126 }
1127 if (rpool->mape.offset > 0) {
1128 if (pf_get_mape_sport(pd, r, naddr, nportp,
1129 &ctx->udp_mapping, rpool)) {
1130 DPFPRINTF(PF_DEBUG_MISC,
1131 "pf: MAP-E port allocation (%u/%u/%u)"
1132 " failed",
1133 rpool->mape.offset,
1134 rpool->mape.psidlen,
1135 rpool->mape.psid);
1136 reason = PFRES_MAPFAILED;
1137 goto notrans;
1138 }
1139 } else if (pf_get_sport(pd, r, naddr, nportp, low, high,
1140 rpool, &ctx->udp_mapping, PF_SN_NAT)) {
1141 DPFPRINTF(PF_DEBUG_MISC,
1142 "pf: NAT proxy port allocation (%u-%u) failed",
1143 rpool->proxy_port[0], rpool->proxy_port[1]);
1144 reason = PFRES_MAPFAILED;
1145 goto notrans;
1146 }
1147 break;
1148 case PF_BINAT:
1149 switch (pd->dir) {
1150 case PF_OUT:
1151 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL){
1152 switch (pd->af) {
1153 #ifdef INET
1154 case AF_INET:
1155 if (rpool->cur->addr.p.dyn->
1156 pfid_acnt4 < 1) {
1157 reason = PFRES_MAPFAILED;
1158 goto notrans;
1159 }
1160 pf_poolmask(naddr,
1161 &rpool->cur->addr.p.dyn->pfid_addr4,
1162 &rpool->cur->addr.p.dyn->pfid_mask4,
1163 &pd->nsaddr, AF_INET);
1164 break;
1165 #endif /* INET */
1166 #ifdef INET6
1167 case AF_INET6:
1168 if (rpool->cur->addr.p.dyn->
1169 pfid_acnt6 < 1) {
1170 reason = PFRES_MAPFAILED;
1171 goto notrans;
1172 }
1173 pf_poolmask(naddr,
1174 &rpool->cur->addr.p.dyn->pfid_addr6,
1175 &rpool->cur->addr.p.dyn->pfid_mask6,
1176 &pd->nsaddr, AF_INET6);
1177 break;
1178 #endif /* INET6 */
1179 }
1180 } else
1181 pf_poolmask(naddr,
1182 &rpool->cur->addr.v.a.addr,
1183 &rpool->cur->addr.v.a.mask, &pd->nsaddr,
1184 pd->af);
1185 break;
1186 case PF_IN:
1187 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
1188 switch (pd->af) {
1189 #ifdef INET
1190 case AF_INET:
1191 if (r->src.addr.p.dyn->pfid_acnt4 < 1) {
1192 reason = PFRES_MAPFAILED;
1193 goto notrans;
1194 }
1195 pf_poolmask(naddr,
1196 &r->src.addr.p.dyn->pfid_addr4,
1197 &r->src.addr.p.dyn->pfid_mask4,
1198 &pd->ndaddr, AF_INET);
1199 break;
1200 #endif /* INET */
1201 #ifdef INET6
1202 case AF_INET6:
1203 if (r->src.addr.p.dyn->pfid_acnt6 < 1) {
1204 reason = PFRES_MAPFAILED;
1205 goto notrans;
1206 }
1207 pf_poolmask(naddr,
1208 &r->src.addr.p.dyn->pfid_addr6,
1209 &r->src.addr.p.dyn->pfid_mask6,
1210 &pd->ndaddr, AF_INET6);
1211 break;
1212 #endif /* INET6 */
1213 }
1214 } else
1215 pf_poolmask(naddr, &r->src.addr.v.a.addr,
1216 &r->src.addr.v.a.mask, &pd->ndaddr, pd->af);
1217 break;
1218 }
1219 break;
1220 case PF_RDR: {
1221 struct pf_state_key_cmp key;
1222 int tries;
1223 uint16_t cut, low, high, nport;
1224
1225 reason = pf_map_addr_sn(pd->af, r, &pd->nsaddr, naddr,
1226 &(pd->naf), NULL, NULL, rpool, PF_SN_NAT);
1227
1228 if (reason != 0)
1229 goto notrans;
1230 if ((rpool->opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
1231 pf_poolmask(naddr, naddr, &rpool->cur->addr.v.a.mask,
1232 &pd->ndaddr, pd->af);
1233
1234 /* Do not change SCTP ports. */
1235 if (pd->proto == IPPROTO_SCTP)
1236 break;
1237
1238 if (rpool->proxy_port[1]) {
1239 uint32_t tmp_nport;
1240 uint16_t div;
1241
1242 div = r->rdr.proxy_port[1] - r->rdr.proxy_port[0] + 1;
1243 div = (div == 0) ? 1 : div;
1244
1245 tmp_nport = ((ntohs(pd->ndport) - ntohs(r->dst.port[0])) % div) +
1246 rpool->proxy_port[0];
1247
1248 /* Wrap around if necessary. */
1249 if (tmp_nport > 65535)
1250 tmp_nport -= 65535;
1251 nport = htons((uint16_t)tmp_nport);
1252 } else if (rpool->proxy_port[0])
1253 nport = htons(rpool->proxy_port[0]);
1254 else
1255 nport = pd->ndport;
1256
1257 /*
1258 * Update the destination port.
1259 */
1260 *nportp = nport;
1261
1262 /*
1263 * Do we have a source port conflict in the stack state? Try to
1264 * modulate the source port if so. Note that this is racy since
1265 * the state lookup may not find any matches here but will once
1266 * pf_create_state() actually instantiates the state.
1267 */
1268 bzero(&key, sizeof(key));
1269 key.af = pd->af;
1270 key.proto = pd->proto;
1271 key.port[0] = pd->nsport;
1272 pf_addrcpy(&key.addr[0], &pd->nsaddr, key.af);
1273 key.port[1] = nport;
1274 pf_addrcpy(&key.addr[1], naddr, key.af);
1275
1276 if (!pf_find_state_all_exists(&key, PF_OUT))
1277 break;
1278
1279 tries = 0;
1280
1281 low = 50001; /* XXX-MJ PF_NAT_PROXY_PORT_LOW/HIGH */
1282 high = 65535;
1283 cut = arc4random() % (1 + high - low) + low;
1284 for (uint32_t tmp = cut;
1285 tmp <= high && tmp <= UINT16_MAX &&
1286 tries < V_pf_rdr_srcport_rewrite_tries;
1287 tmp++, tries++) {
1288 key.port[0] = htons(tmp);
1289 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1290 /* Update the source port. */
1291 ctx->nk->port[0] = htons(tmp);
1292 goto out;
1293 }
1294 }
1295 for (uint32_t tmp = cut - 1;
1296 tmp >= low && tries < V_pf_rdr_srcport_rewrite_tries;
1297 tmp--, tries++) {
1298 key.port[0] = htons(tmp);
1299 if (!pf_find_state_all_exists(&key, PF_OUT)) {
1300 /* Update the source port. */
1301 ctx->nk->port[0] = htons(tmp);
1302 goto out;
1303 }
1304 }
1305
1306 /*
1307 * We failed to find a match. Push on ahead anyway, let
1308 * pf_state_insert() be the arbiter of whether the state
1309 * conflict is tolerable. In particular, with TCP connections
1310 * the state may be reused if the TCP state is terminal.
1311 */
1312 DPFPRINTF(PF_DEBUG_MISC,
1313 "pf: RDR source port allocation failed");
1314 break;
1315
1316 out:
1317 DPFPRINTF(PF_DEBUG_MISC,
1318 "pf: RDR source port allocation %u->%u",
1319 ntohs(pd->nsport), ntohs(ctx->nk->port[0]));
1320 break;
1321 }
1322 default:
1323 panic("%s: unknown action %u", __func__, r->action);
1324 }
1325
1326 /* Return success only if translation really happened. */
1327 if (bcmp(ctx->sk, ctx->nk, sizeof(struct pf_state_key_cmp))) {
1328 return (PFRES_MATCH);
1329 }
1330
1331 reason = PFRES_MAX;
1332 notrans:
1333 uma_zfree(V_pf_state_key_z, ctx->nk);
1334 uma_zfree(V_pf_state_key_z, ctx->sk);
1335 ctx->sk = ctx->nk = NULL;
1336
1337 return (reason);
1338 }
1339
1340 int
pf_get_transaddr_af(struct pf_krule * r,struct pf_pdesc * pd)1341 pf_get_transaddr_af(struct pf_krule *r, struct pf_pdesc *pd)
1342 {
1343 #if defined(INET) && defined(INET6)
1344 struct pf_addr ndaddr, nsaddr, naddr;
1345 u_int16_t nport = 0;
1346 int prefixlen = 96;
1347
1348 bzero(&nsaddr, sizeof(nsaddr));
1349 bzero(&ndaddr, sizeof(ndaddr));
1350
1351 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1352 printf("pf: af-to %s %s, ",
1353 pd->naf == AF_INET ? "inet" : "inet6",
1354 TAILQ_EMPTY(&r->rdr.list) ? "nat" : "rdr");
1355 pf_print_host(&pd->nsaddr, pd->nsport, pd->af);
1356 printf(" -> ");
1357 pf_print_host(&pd->ndaddr, pd->ndport, pd->af);
1358 printf("\n");
1359 }
1360
1361 if (TAILQ_EMPTY(&r->nat.list))
1362 panic("pf_get_transaddr_af: no nat pool for source address");
1363
1364 /* get source address and port */
1365 if (pf_get_sport(pd, r, &nsaddr, &nport, r->nat.proxy_port[0],
1366 r->nat.proxy_port[1], &r->nat, NULL, PF_SN_NAT)) {
1367 DPFPRINTF(PF_DEBUG_MISC,
1368 "pf: af-to NAT proxy port allocation (%u-%u) failed",
1369 r->nat.proxy_port[0], r->nat.proxy_port[1]);
1370 return (-1);
1371 }
1372
1373 if (pd->proto == IPPROTO_ICMPV6 && pd->naf == AF_INET) {
1374 pd->ndport = ntohs(pd->ndport);
1375 if (pd->ndport == ICMP6_ECHO_REQUEST)
1376 pd->ndport = ICMP_ECHO;
1377 else if (pd->ndport == ICMP6_ECHO_REPLY)
1378 pd->ndport = ICMP_ECHOREPLY;
1379 pd->ndport = htons(pd->ndport);
1380 } else if (pd->proto == IPPROTO_ICMP && pd->naf == AF_INET6) {
1381 pd->nsport = ntohs(pd->nsport);
1382 if (pd->ndport == ICMP_ECHO)
1383 pd->ndport = ICMP6_ECHO_REQUEST;
1384 else if (pd->ndport == ICMP_ECHOREPLY)
1385 pd->ndport = ICMP6_ECHO_REPLY;
1386 pd->nsport = htons(pd->nsport);
1387 }
1388
1389 /* get the destination address and port */
1390 if (! TAILQ_EMPTY(&r->rdr.list)) {
1391 if (pf_map_addr_sn(pd->naf, r, &nsaddr, &naddr, &(pd->naf),
1392 NULL, NULL, &r->rdr, PF_SN_NAT))
1393 return (-1);
1394 if (r->rdr.proxy_port[0])
1395 pd->ndport = htons(r->rdr.proxy_port[0]);
1396
1397 if (pd->naf == AF_INET) {
1398 /* The prefix is the IPv4 rdr address */
1399 prefixlen = in_mask2len(
1400 (struct in_addr *)&r->rdr.cur->addr.v.a.mask);
1401 inet_nat46(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1402 prefixlen);
1403 } else {
1404 /* The prefix is the IPv6 rdr address */
1405 prefixlen = in6_mask2len(
1406 (struct in6_addr *)&r->rdr.cur->addr.v.a.mask, NULL);
1407 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &naddr,
1408 prefixlen);
1409 }
1410 } else {
1411 if (pd->naf == AF_INET) {
1412 /* The prefix is the IPv6 dst address */
1413 prefixlen = in6_mask2len(
1414 (struct in6_addr *)&r->dst.addr.v.a.mask, NULL);
1415 if (prefixlen < 32)
1416 prefixlen = 96;
1417 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &pd->ndaddr,
1418 prefixlen);
1419 } else {
1420 /*
1421 * The prefix is the IPv6 nat address
1422 * (that was stored in pd->nsaddr)
1423 */
1424 prefixlen = in6_mask2len(
1425 (struct in6_addr *)&r->nat.cur->addr.v.a.mask, NULL);
1426 if (prefixlen > 96)
1427 prefixlen = 96;
1428 inet_nat64(pd->naf, &pd->ndaddr, &ndaddr, &nsaddr,
1429 prefixlen);
1430 }
1431 }
1432
1433 pf_addrcpy(&pd->nsaddr, &nsaddr, pd->naf);
1434 pf_addrcpy(&pd->ndaddr, &ndaddr, pd->naf);
1435
1436 if (V_pf_status.debug >= PF_DEBUG_MISC) {
1437 printf("pf: af-to %s done, prefixlen %d, ",
1438 pd->naf == AF_INET ? "inet" : "inet6",
1439 prefixlen);
1440 pf_print_host(&pd->nsaddr, pd->nsport, pd->naf);
1441 printf(" -> ");
1442 pf_print_host(&pd->ndaddr, pd->ndport, pd->naf);
1443 printf("\n");
1444 }
1445
1446 return (0);
1447 #else
1448 return (-1);
1449 #endif
1450 }
1451