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 <net/if.h>
51 #include <net/vnet.h>
52 #include <net/pfvar.h>
53 #include <net/if_pflog.h>
54
55 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
56
57 static void pf_hash(struct pf_addr *, struct pf_addr *,
58 struct pf_poolhashkey *, sa_family_t);
59 static struct pf_krule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
60 int, struct pfi_kkif *,
61 struct pf_addr *, u_int16_t, struct pf_addr *,
62 uint16_t, int, struct pf_kanchor_stackframe *);
63 static int pf_get_sport(sa_family_t, uint8_t, struct pf_krule *,
64 struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
65 uint16_t *, uint16_t, uint16_t, struct pf_ksrc_node **);
66
67 #define mix(a,b,c) \
68 do { \
69 a -= b; a -= c; a ^= (c >> 13); \
70 b -= c; b -= a; b ^= (a << 8); \
71 c -= a; c -= b; c ^= (b >> 13); \
72 a -= b; a -= c; a ^= (c >> 12); \
73 b -= c; b -= a; b ^= (a << 16); \
74 c -= a; c -= b; c ^= (b >> 5); \
75 a -= b; a -= c; a ^= (c >> 3); \
76 b -= c; b -= a; b ^= (a << 10); \
77 c -= a; c -= b; c ^= (b >> 15); \
78 } while (0)
79
80 /*
81 * hash function based on bridge_hash in if_bridge.c
82 */
83 static void
pf_hash(struct pf_addr * inaddr,struct pf_addr * hash,struct pf_poolhashkey * key,sa_family_t af)84 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
85 struct pf_poolhashkey *key, sa_family_t af)
86 {
87 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
88
89 switch (af) {
90 #ifdef INET
91 case AF_INET:
92 a += inaddr->addr32[0];
93 b += key->key32[1];
94 mix(a, b, c);
95 hash->addr32[0] = c + key->key32[2];
96 break;
97 #endif /* INET */
98 #ifdef INET6
99 case AF_INET6:
100 a += inaddr->addr32[0];
101 b += inaddr->addr32[2];
102 mix(a, b, c);
103 hash->addr32[0] = c;
104 a += inaddr->addr32[1];
105 b += inaddr->addr32[3];
106 c += key->key32[1];
107 mix(a, b, c);
108 hash->addr32[1] = c;
109 a += inaddr->addr32[2];
110 b += inaddr->addr32[1];
111 c += key->key32[2];
112 mix(a, b, c);
113 hash->addr32[2] = c;
114 a += inaddr->addr32[3];
115 b += inaddr->addr32[0];
116 c += key->key32[3];
117 mix(a, b, c);
118 hash->addr32[3] = c;
119 break;
120 #endif /* INET6 */
121 }
122 }
123
124 static struct pf_krule *
pf_match_translation(struct pf_pdesc * pd,struct mbuf * m,int off,struct pfi_kkif * kif,struct pf_addr * saddr,u_int16_t sport,struct pf_addr * daddr,uint16_t dport,int rs_num,struct pf_kanchor_stackframe * anchor_stack)125 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
126 struct pfi_kkif *kif, struct pf_addr *saddr, u_int16_t sport,
127 struct pf_addr *daddr, uint16_t dport, int rs_num,
128 struct pf_kanchor_stackframe *anchor_stack)
129 {
130 struct pf_krule *r, *rm = NULL;
131 struct pf_kruleset *ruleset = NULL;
132 int tag = -1;
133 int rtableid = -1;
134 int asd = 0;
135
136 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
137 while (r != NULL) {
138 struct pf_rule_addr *src = NULL, *dst = NULL;
139 struct pf_addr_wrap *xdst = NULL;
140
141 if (r->action == PF_BINAT && pd->dir == PF_IN) {
142 src = &r->dst;
143 if (r->rpool.cur != NULL)
144 xdst = &r->rpool.cur->addr;
145 } else {
146 src = &r->src;
147 dst = &r->dst;
148 }
149
150 pf_counter_u64_add(&r->evaluations, 1);
151 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
152 r = r->skip[PF_SKIP_IFP].ptr;
153 else if (r->direction && r->direction != pd->dir)
154 r = r->skip[PF_SKIP_DIR].ptr;
155 else if (r->af && r->af != pd->af)
156 r = r->skip[PF_SKIP_AF].ptr;
157 else if (r->proto && r->proto != pd->proto)
158 r = r->skip[PF_SKIP_PROTO].ptr;
159 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
160 src->neg, kif, M_GETFIB(m)))
161 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
162 PF_SKIP_DST_ADDR].ptr;
163 else if (src->port_op && !pf_match_port(src->port_op,
164 src->port[0], src->port[1], sport))
165 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
166 PF_SKIP_DST_PORT].ptr;
167 else if (dst != NULL &&
168 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL,
169 M_GETFIB(m)))
170 r = r->skip[PF_SKIP_DST_ADDR].ptr;
171 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
172 0, NULL, M_GETFIB(m)))
173 r = TAILQ_NEXT(r, entries);
174 else if (dst != NULL && dst->port_op &&
175 !pf_match_port(dst->port_op, dst->port[0],
176 dst->port[1], dport))
177 r = r->skip[PF_SKIP_DST_PORT].ptr;
178 else if (r->match_tag && !pf_match_tag(m, r, &tag,
179 pd->pf_mtag ? pd->pf_mtag->tag : 0))
180 r = TAILQ_NEXT(r, entries);
181 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
182 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
183 off, &pd->hdr.tcp), r->os_fingerprint)))
184 r = TAILQ_NEXT(r, entries);
185 else {
186 if (r->tag)
187 tag = r->tag;
188 if (r->rtableid >= 0)
189 rtableid = r->rtableid;
190 if (r->anchor == NULL) {
191 rm = r;
192 if (rm->action == PF_NONAT ||
193 rm->action == PF_NORDR ||
194 rm->action == PF_NOBINAT) {
195 rm = NULL;
196 }
197 break;
198 } else
199 pf_step_into_anchor(anchor_stack, &asd,
200 &ruleset, rs_num, &r, NULL, NULL);
201 }
202 if (r == NULL)
203 pf_step_out_of_anchor(anchor_stack, &asd, &ruleset,
204 rs_num, &r, NULL, NULL);
205 }
206
207 if (tag > 0 && pf_tag_packet(m, pd, tag))
208 return (NULL);
209 if (rtableid >= 0)
210 M_SETFIB(m, rtableid);
211
212 return (rm);
213 }
214
215 static int
pf_get_sport(sa_family_t af,u_int8_t proto,struct pf_krule * r,struct pf_addr * saddr,uint16_t sport,struct pf_addr * daddr,uint16_t dport,struct pf_addr * naddr,uint16_t * nport,uint16_t low,uint16_t high,struct pf_ksrc_node ** sn)216 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r,
217 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
218 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low,
219 uint16_t high, struct pf_ksrc_node **sn)
220 {
221 struct pf_state_key_cmp key;
222 struct pf_addr init_addr;
223
224 bzero(&init_addr, sizeof(init_addr));
225 if (pf_map_addr(af, r, saddr, naddr, NULL, &init_addr, sn))
226 return (1);
227
228 bzero(&key, sizeof(key));
229 key.af = af;
230 key.proto = proto;
231 key.port[0] = dport;
232 PF_ACPY(&key.addr[0], daddr, key.af);
233
234 do {
235 PF_ACPY(&key.addr[1], naddr, key.af);
236
237 /*
238 * port search; start random, step;
239 * similar 2 portloop in in_pcbbind
240 */
241 if (proto == IPPROTO_SCTP) {
242 key.port[1] = sport;
243 if (!pf_find_state_all_exists(&key, PF_IN)) {
244 *nport = sport;
245 return (0);
246 } else {
247 return (1); /* Fail mapping. */
248 }
249 } else if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
250 proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
251 /*
252 * XXX bug: icmp states don't use the id on both sides.
253 * (traceroute -I through nat)
254 */
255 key.port[1] = sport;
256 if (!pf_find_state_all_exists(&key, PF_IN)) {
257 *nport = sport;
258 return (0);
259 }
260 } else if (low == high) {
261 key.port[1] = htons(low);
262 if (!pf_find_state_all_exists(&key, PF_IN)) {
263 *nport = htons(low);
264 return (0);
265 }
266 } else {
267 uint32_t tmp;
268 uint16_t cut;
269
270 if (low > high) {
271 tmp = low;
272 low = high;
273 high = tmp;
274 }
275 /* low < high */
276 cut = arc4random() % (1 + high - low) + low;
277 /* low <= cut <= high */
278 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
279 key.port[1] = htons(tmp);
280 if (!pf_find_state_all_exists(&key, PF_IN)) {
281 *nport = htons(tmp);
282 return (0);
283 }
284 }
285 tmp = cut;
286 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
287 key.port[1] = htons(tmp);
288 if (!pf_find_state_all_exists(&key, PF_IN)) {
289 *nport = htons(tmp);
290 return (0);
291 }
292 }
293 }
294
295 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
296 case PF_POOL_RANDOM:
297 case PF_POOL_ROUNDROBIN:
298 /*
299 * pick a different source address since we're out
300 * of free port choices for the current one.
301 */
302 if (pf_map_addr(af, r, saddr, naddr, NULL, &init_addr, sn))
303 return (1);
304 break;
305 case PF_POOL_NONE:
306 case PF_POOL_SRCHASH:
307 case PF_POOL_BITMASK:
308 default:
309 return (1);
310 }
311 } while (! PF_AEQ(&init_addr, naddr, af) );
312 return (1); /* none available */
313 }
314
315 static int
pf_get_mape_sport(sa_family_t af,u_int8_t proto,struct pf_krule * r,struct pf_addr * saddr,uint16_t sport,struct pf_addr * daddr,uint16_t dport,struct pf_addr * naddr,uint16_t * nport,struct pf_ksrc_node ** sn)316 pf_get_mape_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r,
317 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
318 uint16_t dport, struct pf_addr *naddr, uint16_t *nport,
319 struct pf_ksrc_node **sn)
320 {
321 uint16_t psmask, low, highmask;
322 uint16_t i, ahigh, cut;
323 int ashift, psidshift;
324
325 ashift = 16 - r->rpool.mape.offset;
326 psidshift = ashift - r->rpool.mape.psidlen;
327 psmask = r->rpool.mape.psid & ((1U << r->rpool.mape.psidlen) - 1);
328 psmask = psmask << psidshift;
329 highmask = (1U << psidshift) - 1;
330
331 ahigh = (1U << r->rpool.mape.offset) - 1;
332 cut = arc4random() & ahigh;
333 if (cut == 0)
334 cut = 1;
335
336 for (i = cut; i <= ahigh; i++) {
337 low = (i << ashift) | psmask;
338 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport,
339 naddr, nport, low, low | highmask, sn))
340 return (0);
341 }
342 for (i = cut - 1; i > 0; i--) {
343 low = (i << ashift) | psmask;
344 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport,
345 naddr, nport, low, low | highmask, sn))
346 return (0);
347 }
348 return (1);
349 }
350
351 u_short
pf_map_addr(sa_family_t af,struct pf_krule * r,struct pf_addr * saddr,struct pf_addr * naddr,struct pfi_kkif ** nkif,struct pf_addr * init_addr,struct pf_ksrc_node ** sn)352 pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr,
353 struct pf_addr *naddr, struct pfi_kkif **nkif, struct pf_addr *init_addr,
354 struct pf_ksrc_node **sn)
355 {
356 u_short reason = 0;
357 struct pf_kpool *rpool = &r->rpool;
358 struct pf_addr *raddr = NULL, *rmask = NULL;
359 struct pf_srchash *sh = NULL;
360
361 /* Try to find a src_node if none was given and this
362 is a sticky-address rule. */
363 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
364 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
365 *sn = pf_find_src_node(saddr, r, af, &sh, false);
366
367 /* If a src_node was found or explicitly given and it has a non-zero
368 route address, use this address. A zeroed address is found if the
369 src node was created just a moment ago in pf_create_state and it
370 needs to be filled in with routing decision calculated here. */
371 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
372 /* If the supplied address is the same as the current one we've
373 * been asked before, so tell the caller that there's no other
374 * address to be had. */
375 if (PF_AEQ(naddr, &(*sn)->raddr, af)) {
376 reason = PFRES_MAPFAILED;
377 goto done;
378 }
379
380 PF_ACPY(naddr, &(*sn)->raddr, af);
381 if (nkif)
382 *nkif = (*sn)->rkif;
383 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
384 printf("pf_map_addr: src tracking maps ");
385 pf_print_host(saddr, 0, af);
386 printf(" to ");
387 pf_print_host(naddr, 0, af);
388 if (nkif)
389 printf("@%s", (*nkif)->pfik_name);
390 printf("\n");
391 }
392 goto done;
393 }
394
395 mtx_lock(&rpool->mtx);
396 /* Find the route using chosen algorithm. Store the found route
397 in src_node if it was given or found. */
398 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) {
399 reason = PFRES_MAPFAILED;
400 goto done_pool_mtx;
401 }
402 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
403 switch (af) {
404 #ifdef INET
405 case AF_INET:
406 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
407 (rpool->opts & PF_POOL_TYPEMASK) !=
408 PF_POOL_ROUNDROBIN) {
409 reason = PFRES_MAPFAILED;
410 goto done_pool_mtx;
411 }
412 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
413 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
414 break;
415 #endif /* INET */
416 #ifdef INET6
417 case AF_INET6:
418 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
419 (rpool->opts & PF_POOL_TYPEMASK) !=
420 PF_POOL_ROUNDROBIN) {
421 reason = PFRES_MAPFAILED;
422 goto done_pool_mtx;
423 }
424 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
425 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
426 break;
427 #endif /* INET6 */
428 }
429 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
430 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) {
431 reason = PFRES_MAPFAILED;
432 goto done_pool_mtx; /* unsupported */
433 }
434 } else {
435 raddr = &rpool->cur->addr.v.a.addr;
436 rmask = &rpool->cur->addr.v.a.mask;
437 }
438
439 switch (rpool->opts & PF_POOL_TYPEMASK) {
440 case PF_POOL_NONE:
441 PF_ACPY(naddr, raddr, af);
442 break;
443 case PF_POOL_BITMASK:
444 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
445 break;
446 case PF_POOL_RANDOM:
447 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
448 switch (af) {
449 #ifdef INET
450 case AF_INET:
451 rpool->counter.addr32[0] = htonl(arc4random());
452 break;
453 #endif /* INET */
454 #ifdef INET6
455 case AF_INET6:
456 if (rmask->addr32[3] != 0xffffffff)
457 rpool->counter.addr32[3] =
458 htonl(arc4random());
459 else
460 break;
461 if (rmask->addr32[2] != 0xffffffff)
462 rpool->counter.addr32[2] =
463 htonl(arc4random());
464 else
465 break;
466 if (rmask->addr32[1] != 0xffffffff)
467 rpool->counter.addr32[1] =
468 htonl(arc4random());
469 else
470 break;
471 if (rmask->addr32[0] != 0xffffffff)
472 rpool->counter.addr32[0] =
473 htonl(arc4random());
474 break;
475 #endif /* INET6 */
476 }
477 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
478 PF_ACPY(init_addr, naddr, af);
479
480 } else {
481 PF_AINC(&rpool->counter, af);
482 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
483 }
484 break;
485 case PF_POOL_SRCHASH:
486 {
487 unsigned char hash[16];
488
489 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
490 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
491 break;
492 }
493 case PF_POOL_ROUNDROBIN:
494 {
495 struct pf_kpooladdr *acur = rpool->cur;
496
497 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
498 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
499 &rpool->tblidx, &rpool->counter, af))
500 goto get_addr;
501 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
502 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
503 &rpool->tblidx, &rpool->counter, af))
504 goto get_addr;
505 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
506 goto get_addr;
507
508 try_next:
509 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
510 rpool->cur = TAILQ_FIRST(&rpool->list);
511 else
512 rpool->cur = TAILQ_NEXT(rpool->cur, entries);
513 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
514 rpool->tblidx = -1;
515 if (pfr_pool_get(rpool->cur->addr.p.tbl,
516 &rpool->tblidx, &rpool->counter, af)) {
517 /* table contains no address of type 'af' */
518 if (rpool->cur != acur)
519 goto try_next;
520 reason = PFRES_MAPFAILED;
521 goto done_pool_mtx;
522 }
523 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
524 rpool->tblidx = -1;
525 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
526 &rpool->tblidx, &rpool->counter, af)) {
527 /* table contains no address of type 'af' */
528 if (rpool->cur != acur)
529 goto try_next;
530 reason = PFRES_MAPFAILED;
531 goto done_pool_mtx;
532 }
533 } else {
534 raddr = &rpool->cur->addr.v.a.addr;
535 rmask = &rpool->cur->addr.v.a.mask;
536 PF_ACPY(&rpool->counter, raddr, af);
537 }
538
539 get_addr:
540 PF_ACPY(naddr, &rpool->counter, af);
541 if (init_addr != NULL && PF_AZERO(init_addr, af))
542 PF_ACPY(init_addr, naddr, af);
543 PF_AINC(&rpool->counter, af);
544 break;
545 }
546 }
547
548 if (nkif)
549 *nkif = rpool->cur->kif;
550
551 if (*sn != NULL) {
552 PF_ACPY(&(*sn)->raddr, naddr, af);
553 if (nkif)
554 (*sn)->rkif = *nkif;
555 }
556
557 if (V_pf_status.debug >= PF_DEBUG_NOISY &&
558 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
559 printf("pf_map_addr: selected address ");
560 pf_print_host(naddr, 0, af);
561 if (nkif)
562 printf("@%s", (*nkif)->pfik_name);
563 printf("\n");
564 }
565
566 done_pool_mtx:
567 mtx_unlock(&rpool->mtx);
568
569 done:
570 if (reason) {
571 counter_u64_add(V_pf_status.counters[reason], 1);
572 }
573
574 return (reason);
575 }
576
577 struct pf_krule *
pf_get_translation(struct pf_pdesc * pd,struct mbuf * m,int off,struct pfi_kkif * kif,struct pf_ksrc_node ** sn,struct pf_state_key ** skp,struct pf_state_key ** nkp,struct pf_addr * saddr,struct pf_addr * daddr,uint16_t sport,uint16_t dport,struct pf_kanchor_stackframe * anchor_stack)578 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
579 struct pfi_kkif *kif, struct pf_ksrc_node **sn,
580 struct pf_state_key **skp, struct pf_state_key **nkp,
581 struct pf_addr *saddr, struct pf_addr *daddr,
582 uint16_t sport, uint16_t dport, struct pf_kanchor_stackframe *anchor_stack)
583 {
584 struct pf_krule *r = NULL;
585 struct pf_addr *naddr;
586 uint16_t *nport;
587 uint16_t low, high;
588
589 PF_RULES_RASSERT();
590 KASSERT(*skp == NULL, ("*skp not NULL"));
591 KASSERT(*nkp == NULL, ("*nkp not NULL"));
592
593 if (pd->dir == PF_OUT) {
594 r = pf_match_translation(pd, m, off, kif, saddr,
595 sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
596 if (r == NULL)
597 r = pf_match_translation(pd, m, off, kif,
598 saddr, sport, daddr, dport, PF_RULESET_NAT,
599 anchor_stack);
600 } else {
601 r = pf_match_translation(pd, m, off, kif, saddr,
602 sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
603 if (r == NULL)
604 r = pf_match_translation(pd, m, off, kif,
605 saddr, sport, daddr, dport, PF_RULESET_BINAT,
606 anchor_stack);
607 }
608
609 if (r == NULL)
610 return (NULL);
611
612 switch (r->action) {
613 case PF_NONAT:
614 case PF_NOBINAT:
615 case PF_NORDR:
616 return (NULL);
617 }
618
619 *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
620 if (*skp == NULL)
621 return (NULL);
622 *nkp = pf_state_key_clone(*skp);
623 if (*nkp == NULL) {
624 uma_zfree(V_pf_state_key_z, *skp);
625 *skp = NULL;
626 return (NULL);
627 }
628
629 /* XXX We only modify one side for now. */
630 naddr = &(*nkp)->addr[1];
631 nport = &(*nkp)->port[1];
632
633 switch (r->action) {
634 case PF_NAT:
635 if (pd->proto == IPPROTO_ICMP) {
636 low = 1;
637 high = 65535;
638 } else {
639 low = r->rpool.proxy_port[0];
640 high = r->rpool.proxy_port[1];
641 }
642 if (r->rpool.mape.offset > 0) {
643 if (pf_get_mape_sport(pd->af, pd->proto, r, saddr,
644 sport, daddr, dport, naddr, nport, sn)) {
645 DPFPRINTF(PF_DEBUG_MISC,
646 ("pf: MAP-E port allocation (%u/%u/%u)"
647 " failed\n",
648 r->rpool.mape.offset,
649 r->rpool.mape.psidlen,
650 r->rpool.mape.psid));
651 goto notrans;
652 }
653 } else if (pf_get_sport(pd->af, pd->proto, r, saddr, sport,
654 daddr, dport, naddr, nport, low, high, sn)) {
655 DPFPRINTF(PF_DEBUG_MISC,
656 ("pf: NAT proxy port allocation (%u-%u) failed\n",
657 r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
658 goto notrans;
659 }
660 break;
661 case PF_BINAT:
662 switch (pd->dir) {
663 case PF_OUT:
664 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
665 switch (pd->af) {
666 #ifdef INET
667 case AF_INET:
668 if (r->rpool.cur->addr.p.dyn->
669 pfid_acnt4 < 1)
670 goto notrans;
671 PF_POOLMASK(naddr,
672 &r->rpool.cur->addr.p.dyn->
673 pfid_addr4,
674 &r->rpool.cur->addr.p.dyn->
675 pfid_mask4, saddr, AF_INET);
676 break;
677 #endif /* INET */
678 #ifdef INET6
679 case AF_INET6:
680 if (r->rpool.cur->addr.p.dyn->
681 pfid_acnt6 < 1)
682 goto notrans;
683 PF_POOLMASK(naddr,
684 &r->rpool.cur->addr.p.dyn->
685 pfid_addr6,
686 &r->rpool.cur->addr.p.dyn->
687 pfid_mask6, saddr, AF_INET6);
688 break;
689 #endif /* INET6 */
690 }
691 } else
692 PF_POOLMASK(naddr,
693 &r->rpool.cur->addr.v.a.addr,
694 &r->rpool.cur->addr.v.a.mask, saddr,
695 pd->af);
696 break;
697 case PF_IN:
698 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
699 switch (pd->af) {
700 #ifdef INET
701 case AF_INET:
702 if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
703 goto notrans;
704 PF_POOLMASK(naddr,
705 &r->src.addr.p.dyn->pfid_addr4,
706 &r->src.addr.p.dyn->pfid_mask4,
707 daddr, AF_INET);
708 break;
709 #endif /* INET */
710 #ifdef INET6
711 case AF_INET6:
712 if (r->src.addr.p.dyn->pfid_acnt6 < 1)
713 goto notrans;
714 PF_POOLMASK(naddr,
715 &r->src.addr.p.dyn->pfid_addr6,
716 &r->src.addr.p.dyn->pfid_mask6,
717 daddr, AF_INET6);
718 break;
719 #endif /* INET6 */
720 }
721 } else
722 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
723 &r->src.addr.v.a.mask, daddr, pd->af);
724 break;
725 }
726 break;
727 case PF_RDR: {
728 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, NULL, sn))
729 goto notrans;
730 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
731 PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
732 daddr, pd->af);
733
734 /* Do not change SCTP ports. */
735 if (pd->proto == IPPROTO_SCTP)
736 break;
737
738 if (r->rpool.proxy_port[1]) {
739 uint32_t tmp_nport;
740
741 tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
742 (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
743 1)) + r->rpool.proxy_port[0];
744
745 /* Wrap around if necessary. */
746 if (tmp_nport > 65535)
747 tmp_nport -= 65535;
748 *nport = htons((uint16_t)tmp_nport);
749 } else if (r->rpool.proxy_port[0])
750 *nport = htons(r->rpool.proxy_port[0]);
751 break;
752 }
753 default:
754 panic("%s: unknown action %u", __func__, r->action);
755 }
756
757 /* Return success only if translation really happened. */
758 if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
759 return (r);
760
761 notrans:
762 uma_zfree(V_pf_state_key_z, *nkp);
763 uma_zfree(V_pf_state_key_z, *skp);
764 *skp = *nkp = NULL;
765 *sn = NULL;
766
767 return (NULL);
768 }
769