FreeBSD/Linux Kernel Cross Reference
sys/netpfil/pf/pf_lb.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 Daniel Hartmeier
5 * Copyright (c) 2002 - 2008 Henning Brauer
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * - Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * - Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 *
32 * Effort sponsored in part by the Defense Advanced Research Projects
33 * Agency (DARPA) and Air Force Research Laboratory, Air Force
34 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
35 *
36 * $OpenBSD: pf_lb.c,v 1.2 2009/02/12 02:13:15 sthen Exp $
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include "opt_pf.h"
43 #include "opt_inet.h"
44 #include "opt_inet6.h"
45
46 #include <sys/param.h>
47 #include <sys/lock.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50 #include <sys/sysctl.h>
51
52 #include <net/if.h>
53 #include <net/vnet.h>
54 #include <net/pfvar.h>
55 #include <net/if_pflog.h>
56
57 #define DPFPRINTF(n, x) if (V_pf_status.debug >= (n)) printf x
58
59 static void pf_hash(struct pf_addr *, struct pf_addr *,
60 struct pf_poolhashkey *, sa_family_t);
61 static struct pf_krule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
62 int, int, struct pfi_kkif *,
63 struct pf_addr *, u_int16_t, struct pf_addr *,
64 uint16_t, int, struct pf_kanchor_stackframe *);
65 static int pf_get_sport(sa_family_t, uint8_t, struct pf_krule *,
66 struct pf_addr *, uint16_t, struct pf_addr *, uint16_t, struct pf_addr *,
67 uint16_t *, uint16_t, uint16_t, struct pf_ksrc_node **);
68
69 #define mix(a,b,c) \
70 do { \
71 a -= b; a -= c; a ^= (c >> 13); \
72 b -= c; b -= a; b ^= (a << 8); \
73 c -= a; c -= b; c ^= (b >> 13); \
74 a -= b; a -= c; a ^= (c >> 12); \
75 b -= c; b -= a; b ^= (a << 16); \
76 c -= a; c -= b; c ^= (b >> 5); \
77 a -= b; a -= c; a ^= (c >> 3); \
78 b -= c; b -= a; b ^= (a << 10); \
79 c -= a; c -= b; c ^= (b >> 15); \
80 } while (0)
81
82 /*
83 * hash function based on bridge_hash in if_bridge.c
84 */
85 static void
86 pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
87 struct pf_poolhashkey *key, sa_family_t af)
88 {
89 u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
90
91 switch (af) {
92 #ifdef INET
93 case AF_INET:
94 a += inaddr->addr32[0];
95 b += key->key32[1];
96 mix(a, b, c);
97 hash->addr32[0] = c + key->key32[2];
98 break;
99 #endif /* INET */
100 #ifdef INET6
101 case AF_INET6:
102 a += inaddr->addr32[0];
103 b += inaddr->addr32[2];
104 mix(a, b, c);
105 hash->addr32[0] = c;
106 a += inaddr->addr32[1];
107 b += inaddr->addr32[3];
108 c += key->key32[1];
109 mix(a, b, c);
110 hash->addr32[1] = c;
111 a += inaddr->addr32[2];
112 b += inaddr->addr32[1];
113 c += key->key32[2];
114 mix(a, b, c);
115 hash->addr32[2] = c;
116 a += inaddr->addr32[3];
117 b += inaddr->addr32[0];
118 c += key->key32[3];
119 mix(a, b, c);
120 hash->addr32[3] = c;
121 break;
122 #endif /* INET6 */
123 }
124 }
125
126 static struct pf_krule *
127 pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
128 int direction, struct pfi_kkif *kif, struct pf_addr *saddr, u_int16_t sport,
129 struct pf_addr *daddr, uint16_t dport, int rs_num,
130 struct pf_kanchor_stackframe *anchor_stack)
131 {
132 struct pf_krule *r, *rm = NULL;
133 struct pf_kruleset *ruleset = NULL;
134 int tag = -1;
135 int rtableid = -1;
136 int asd = 0;
137
138 r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
139 while (r != NULL) {
140 struct pf_rule_addr *src = NULL, *dst = NULL;
141 struct pf_addr_wrap *xdst = NULL;
142
143 if (r->action == PF_BINAT && direction == PF_IN) {
144 src = &r->dst;
145 if (r->rpool.cur != NULL)
146 xdst = &r->rpool.cur->addr;
147 } else {
148 src = &r->src;
149 dst = &r->dst;
150 }
151
152 pf_counter_u64_add(&r->evaluations, 1);
153 if (pfi_kkif_match(r->kif, kif) == r->ifnot)
154 r = r->skip[PF_SKIP_IFP].ptr;
155 else if (r->direction && r->direction != direction)
156 r = r->skip[PF_SKIP_DIR].ptr;
157 else if (r->af && r->af != pd->af)
158 r = r->skip[PF_SKIP_AF].ptr;
159 else if (r->proto && r->proto != pd->proto)
160 r = r->skip[PF_SKIP_PROTO].ptr;
161 else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
162 src->neg, kif, M_GETFIB(m)))
163 r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
164 PF_SKIP_DST_ADDR].ptr;
165 else if (src->port_op && !pf_match_port(src->port_op,
166 src->port[0], src->port[1], sport))
167 r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
168 PF_SKIP_DST_PORT].ptr;
169 else if (dst != NULL &&
170 PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL,
171 M_GETFIB(m)))
172 r = r->skip[PF_SKIP_DST_ADDR].ptr;
173 else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
174 0, NULL, M_GETFIB(m)))
175 r = TAILQ_NEXT(r, entries);
176 else if (dst != NULL && dst->port_op &&
177 !pf_match_port(dst->port_op, dst->port[0],
178 dst->port[1], dport))
179 r = r->skip[PF_SKIP_DST_PORT].ptr;
180 else if (r->match_tag && !pf_match_tag(m, r, &tag,
181 pd->pf_mtag ? pd->pf_mtag->tag : 0))
182 r = TAILQ_NEXT(r, entries);
183 else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
184 IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
185 off, &pd->hdr.tcp), r->os_fingerprint)))
186 r = TAILQ_NEXT(r, entries);
187 else {
188 if (r->tag)
189 tag = r->tag;
190 if (r->rtableid >= 0)
191 rtableid = r->rtableid;
192 if (r->anchor == NULL) {
193 rm = r;
194 if (rm->action == PF_NONAT ||
195 rm->action == PF_NORDR ||
196 rm->action == PF_NOBINAT) {
197 rm = NULL;
198 }
199 break;
200 } else
201 pf_step_into_anchor(anchor_stack, &asd,
202 &ruleset, rs_num, &r, NULL, NULL);
203 }
204 if (r == NULL)
205 pf_step_out_of_anchor(anchor_stack, &asd, &ruleset,
206 rs_num, &r, NULL, NULL);
207 }
208
209 if (tag > 0 && pf_tag_packet(m, pd, tag))
210 return (NULL);
211 if (rtableid >= 0)
212 M_SETFIB(m, rtableid);
213
214 return (rm);
215 }
216
217 static int
218 pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r,
219 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
220 uint16_t dport, struct pf_addr *naddr, uint16_t *nport, uint16_t low,
221 uint16_t high, struct pf_ksrc_node **sn)
222 {
223 struct pf_state_key_cmp key;
224 struct pf_addr init_addr;
225
226 bzero(&init_addr, sizeof(init_addr));
227 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
228 return (1);
229
230 bzero(&key, sizeof(key));
231 key.af = af;
232 key.proto = proto;
233 key.port[0] = dport;
234 PF_ACPY(&key.addr[0], daddr, key.af);
235
236 do {
237 PF_ACPY(&key.addr[1], naddr, key.af);
238
239 /*
240 * port search; start random, step;
241 * similar 2 portloop in in_pcbbind
242 */
243 if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
244 proto == IPPROTO_ICMP) || (low == 0 && high == 0)) {
245 /*
246 * XXX bug: icmp states don't use the id on both sides.
247 * (traceroute -I through nat)
248 */
249 key.port[1] = sport;
250 if (!pf_find_state_all_exists(&key, PF_IN)) {
251 *nport = sport;
252 return (0);
253 }
254 } else if (low == high) {
255 key.port[1] = htons(low);
256 if (!pf_find_state_all_exists(&key, PF_IN)) {
257 *nport = htons(low);
258 return (0);
259 }
260 } else {
261 uint32_t tmp;
262 uint16_t cut;
263
264 if (low > high) {
265 tmp = low;
266 low = high;
267 high = tmp;
268 }
269 /* low < high */
270 cut = arc4random() % (1 + high - low) + low;
271 /* low <= cut <= high */
272 for (tmp = cut; tmp <= high && tmp <= 0xffff; ++tmp) {
273 key.port[1] = htons(tmp);
274 if (!pf_find_state_all_exists(&key, PF_IN)) {
275 *nport = htons(tmp);
276 return (0);
277 }
278 }
279 tmp = cut;
280 for (tmp -= 1; tmp >= low && tmp <= 0xffff; --tmp) {
281 key.port[1] = htons(tmp);
282 if (!pf_find_state_all_exists(&key, PF_IN)) {
283 *nport = htons(tmp);
284 return (0);
285 }
286 }
287 }
288
289 switch (r->rpool.opts & PF_POOL_TYPEMASK) {
290 case PF_POOL_RANDOM:
291 case PF_POOL_ROUNDROBIN:
292 /*
293 * pick a different source address since we're out
294 * of free port choices for the current one.
295 */
296 if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
297 return (1);
298 break;
299 case PF_POOL_NONE:
300 case PF_POOL_SRCHASH:
301 case PF_POOL_BITMASK:
302 default:
303 return (1);
304 }
305 } while (! PF_AEQ(&init_addr, naddr, af) );
306 return (1); /* none available */
307 }
308
309 static int
310 pf_get_mape_sport(sa_family_t af, u_int8_t proto, struct pf_krule *r,
311 struct pf_addr *saddr, uint16_t sport, struct pf_addr *daddr,
312 uint16_t dport, struct pf_addr *naddr, uint16_t *nport,
313 struct pf_ksrc_node **sn)
314 {
315 uint16_t psmask, low, highmask;
316 uint16_t i, ahigh, cut;
317 int ashift, psidshift;
318
319 ashift = 16 - r->rpool.mape.offset;
320 psidshift = ashift - r->rpool.mape.psidlen;
321 psmask = r->rpool.mape.psid & ((1U << r->rpool.mape.psidlen) - 1);
322 psmask = psmask << psidshift;
323 highmask = (1U << psidshift) - 1;
324
325 ahigh = (1U << r->rpool.mape.offset) - 1;
326 cut = arc4random() & ahigh;
327 if (cut == 0)
328 cut = 1;
329
330 for (i = cut; i <= ahigh; i++) {
331 low = (i << ashift) | psmask;
332 if (!pf_get_sport(af, proto, r, saddr, sport, daddr, dport,
333 naddr, nport, low, low | highmask, sn))
334 return (0);
335 }
336 for (i = cut - 1; i > 0; 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 return (1);
343 }
344
345 int
346 pf_map_addr(sa_family_t af, struct pf_krule *r, struct pf_addr *saddr,
347 struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_ksrc_node **sn)
348 {
349 struct pf_kpool *rpool = &r->rpool;
350 struct pf_addr *raddr = NULL, *rmask = NULL;
351
352 /* Try to find a src_node if none was given and this
353 is a sticky-address rule. */
354 if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
355 (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE)
356 *sn = pf_find_src_node(saddr, r, af, 0);
357
358 /* If a src_node was found or explicitly given and it has a non-zero
359 route address, use this address. A zeroed address is found if the
360 src node was created just a moment ago in pf_create_state and it
361 needs to be filled in with routing decision calculated here. */
362 if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
363 /* If the supplied address is the same as the current one we've
364 * been asked before, so tell the caller that there's no other
365 * address to be had. */
366 if (PF_AEQ(naddr, &(*sn)->raddr, af))
367 return (1);
368
369 PF_ACPY(naddr, &(*sn)->raddr, af);
370 if (V_pf_status.debug >= PF_DEBUG_NOISY) {
371 printf("pf_map_addr: src tracking maps ");
372 pf_print_host(saddr, 0, af);
373 printf(" to ");
374 pf_print_host(naddr, 0, af);
375 printf("\n");
376 }
377 return (0);
378 }
379
380 mtx_lock(&rpool->mtx);
381 /* Find the route using chosen algorithm. Store the found route
382 in src_node if it was given or found. */
383 if (rpool->cur->addr.type == PF_ADDR_NOROUTE) {
384 mtx_unlock(&rpool->mtx);
385 return (1);
386 }
387 if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
388 switch (af) {
389 #ifdef INET
390 case AF_INET:
391 if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
392 (rpool->opts & PF_POOL_TYPEMASK) !=
393 PF_POOL_ROUNDROBIN) {
394 mtx_unlock(&rpool->mtx);
395 return (1);
396 }
397 raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
398 rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
399 break;
400 #endif /* INET */
401 #ifdef INET6
402 case AF_INET6:
403 if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
404 (rpool->opts & PF_POOL_TYPEMASK) !=
405 PF_POOL_ROUNDROBIN) {
406 mtx_unlock(&rpool->mtx);
407 return (1);
408 }
409 raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
410 rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
411 break;
412 #endif /* INET6 */
413 }
414 } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
415 if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN) {
416 mtx_unlock(&rpool->mtx);
417 return (1); /* unsupported */
418 }
419 } else {
420 raddr = &rpool->cur->addr.v.a.addr;
421 rmask = &rpool->cur->addr.v.a.mask;
422 }
423
424 switch (rpool->opts & PF_POOL_TYPEMASK) {
425 case PF_POOL_NONE:
426 PF_ACPY(naddr, raddr, af);
427 break;
428 case PF_POOL_BITMASK:
429 PF_POOLMASK(naddr, raddr, rmask, saddr, af);
430 break;
431 case PF_POOL_RANDOM:
432 if (init_addr != NULL && PF_AZERO(init_addr, af)) {
433 switch (af) {
434 #ifdef INET
435 case AF_INET:
436 rpool->counter.addr32[0] = htonl(arc4random());
437 break;
438 #endif /* INET */
439 #ifdef INET6
440 case AF_INET6:
441 if (rmask->addr32[3] != 0xffffffff)
442 rpool->counter.addr32[3] =
443 htonl(arc4random());
444 else
445 break;
446 if (rmask->addr32[2] != 0xffffffff)
447 rpool->counter.addr32[2] =
448 htonl(arc4random());
449 else
450 break;
451 if (rmask->addr32[1] != 0xffffffff)
452 rpool->counter.addr32[1] =
453 htonl(arc4random());
454 else
455 break;
456 if (rmask->addr32[0] != 0xffffffff)
457 rpool->counter.addr32[0] =
458 htonl(arc4random());
459 break;
460 #endif /* INET6 */
461 }
462 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
463 PF_ACPY(init_addr, naddr, af);
464
465 } else {
466 PF_AINC(&rpool->counter, af);
467 PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
468 }
469 break;
470 case PF_POOL_SRCHASH:
471 {
472 unsigned char hash[16];
473
474 pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
475 PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
476 break;
477 }
478 case PF_POOL_ROUNDROBIN:
479 {
480 struct pf_kpooladdr *acur = rpool->cur;
481
482 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
483 if (!pfr_pool_get(rpool->cur->addr.p.tbl,
484 &rpool->tblidx, &rpool->counter, af))
485 goto get_addr;
486 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
487 if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
488 &rpool->tblidx, &rpool->counter, af))
489 goto get_addr;
490 } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
491 goto get_addr;
492
493 try_next:
494 if (TAILQ_NEXT(rpool->cur, entries) == NULL)
495 rpool->cur = TAILQ_FIRST(&rpool->list);
496 else
497 rpool->cur = TAILQ_NEXT(rpool->cur, entries);
498 if (rpool->cur->addr.type == PF_ADDR_TABLE) {
499 rpool->tblidx = -1;
500 if (pfr_pool_get(rpool->cur->addr.p.tbl,
501 &rpool->tblidx, &rpool->counter, af)) {
502 /* table contains no address of type 'af' */
503 if (rpool->cur != acur)
504 goto try_next;
505 mtx_unlock(&rpool->mtx);
506 return (1);
507 }
508 } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
509 rpool->tblidx = -1;
510 if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
511 &rpool->tblidx, &rpool->counter, af)) {
512 /* table contains no address of type 'af' */
513 if (rpool->cur != acur)
514 goto try_next;
515 mtx_unlock(&rpool->mtx);
516 return (1);
517 }
518 } else {
519 raddr = &rpool->cur->addr.v.a.addr;
520 rmask = &rpool->cur->addr.v.a.mask;
521 PF_ACPY(&rpool->counter, raddr, af);
522 }
523
524 get_addr:
525 PF_ACPY(naddr, &rpool->counter, af);
526 if (init_addr != NULL && PF_AZERO(init_addr, af))
527 PF_ACPY(init_addr, naddr, af);
528 PF_AINC(&rpool->counter, af);
529 break;
530 }
531 }
532 if (*sn != NULL)
533 PF_ACPY(&(*sn)->raddr, naddr, af);
534
535 mtx_unlock(&rpool->mtx);
536
537 if (V_pf_status.debug >= PF_DEBUG_NOISY &&
538 (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
539 printf("pf_map_addr: selected address ");
540 pf_print_host(naddr, 0, af);
541 printf("\n");
542 }
543
544 return (0);
545 }
546
547 struct pf_krule *
548 pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
549 struct pfi_kkif *kif, struct pf_ksrc_node **sn,
550 struct pf_state_key **skp, struct pf_state_key **nkp,
551 struct pf_addr *saddr, struct pf_addr *daddr,
552 uint16_t sport, uint16_t dport, struct pf_kanchor_stackframe *anchor_stack)
553 {
554 struct pf_krule *r = NULL;
555 struct pf_addr *naddr;
556 uint16_t *nport;
557 uint16_t low, high;
558
559 PF_RULES_RASSERT();
560 KASSERT(*skp == NULL, ("*skp not NULL"));
561 KASSERT(*nkp == NULL, ("*nkp not NULL"));
562
563 if (direction == PF_OUT) {
564 r = pf_match_translation(pd, m, off, direction, kif, saddr,
565 sport, daddr, dport, PF_RULESET_BINAT, anchor_stack);
566 if (r == NULL)
567 r = pf_match_translation(pd, m, off, direction, kif,
568 saddr, sport, daddr, dport, PF_RULESET_NAT,
569 anchor_stack);
570 } else {
571 r = pf_match_translation(pd, m, off, direction, kif, saddr,
572 sport, daddr, dport, PF_RULESET_RDR, anchor_stack);
573 if (r == NULL)
574 r = pf_match_translation(pd, m, off, direction, kif,
575 saddr, sport, daddr, dport, PF_RULESET_BINAT,
576 anchor_stack);
577 }
578
579 if (r == NULL)
580 return (NULL);
581
582 switch (r->action) {
583 case PF_NONAT:
584 case PF_NOBINAT:
585 case PF_NORDR:
586 return (NULL);
587 }
588
589 *skp = pf_state_key_setup(pd, saddr, daddr, sport, dport);
590 if (*skp == NULL)
591 return (NULL);
592 *nkp = pf_state_key_clone(*skp);
593 if (*nkp == NULL) {
594 uma_zfree(V_pf_state_key_z, *skp);
595 *skp = NULL;
596 return (NULL);
597 }
598
599 /* XXX We only modify one side for now. */
600 naddr = &(*nkp)->addr[1];
601 nport = &(*nkp)->port[1];
602
603 switch (r->action) {
604 case PF_NAT:
605 if (pd->proto == IPPROTO_ICMP) {
606 low = 1;
607 high = 65535;
608 } else {
609 low = r->rpool.proxy_port[0];
610 high = r->rpool.proxy_port[1];
611 }
612 if (r->rpool.mape.offset > 0) {
613 if (pf_get_mape_sport(pd->af, pd->proto, r, saddr,
614 sport, daddr, dport, naddr, nport, sn)) {
615 DPFPRINTF(PF_DEBUG_MISC,
616 ("pf: MAP-E port allocation (%u/%u/%u)"
617 " failed\n",
618 r->rpool.mape.offset,
619 r->rpool.mape.psidlen,
620 r->rpool.mape.psid));
621 goto notrans;
622 }
623 } else if (pf_get_sport(pd->af, pd->proto, r, saddr, sport,
624 daddr, dport, naddr, nport, low, high, sn)) {
625 DPFPRINTF(PF_DEBUG_MISC,
626 ("pf: NAT proxy port allocation (%u-%u) failed\n",
627 r->rpool.proxy_port[0], r->rpool.proxy_port[1]));
628 goto notrans;
629 }
630 break;
631 case PF_BINAT:
632 switch (direction) {
633 case PF_OUT:
634 if (r->rpool.cur->addr.type == PF_ADDR_DYNIFTL){
635 switch (pd->af) {
636 #ifdef INET
637 case AF_INET:
638 if (r->rpool.cur->addr.p.dyn->
639 pfid_acnt4 < 1)
640 goto notrans;
641 PF_POOLMASK(naddr,
642 &r->rpool.cur->addr.p.dyn->
643 pfid_addr4,
644 &r->rpool.cur->addr.p.dyn->
645 pfid_mask4, saddr, AF_INET);
646 break;
647 #endif /* INET */
648 #ifdef INET6
649 case AF_INET6:
650 if (r->rpool.cur->addr.p.dyn->
651 pfid_acnt6 < 1)
652 goto notrans;
653 PF_POOLMASK(naddr,
654 &r->rpool.cur->addr.p.dyn->
655 pfid_addr6,
656 &r->rpool.cur->addr.p.dyn->
657 pfid_mask6, saddr, AF_INET6);
658 break;
659 #endif /* INET6 */
660 }
661 } else
662 PF_POOLMASK(naddr,
663 &r->rpool.cur->addr.v.a.addr,
664 &r->rpool.cur->addr.v.a.mask, saddr,
665 pd->af);
666 break;
667 case PF_IN:
668 if (r->src.addr.type == PF_ADDR_DYNIFTL) {
669 switch (pd->af) {
670 #ifdef INET
671 case AF_INET:
672 if (r->src.addr.p.dyn-> pfid_acnt4 < 1)
673 goto notrans;
674 PF_POOLMASK(naddr,
675 &r->src.addr.p.dyn->pfid_addr4,
676 &r->src.addr.p.dyn->pfid_mask4,
677 daddr, AF_INET);
678 break;
679 #endif /* INET */
680 #ifdef INET6
681 case AF_INET6:
682 if (r->src.addr.p.dyn->pfid_acnt6 < 1)
683 goto notrans;
684 PF_POOLMASK(naddr,
685 &r->src.addr.p.dyn->pfid_addr6,
686 &r->src.addr.p.dyn->pfid_mask6,
687 daddr, AF_INET6);
688 break;
689 #endif /* INET6 */
690 }
691 } else
692 PF_POOLMASK(naddr, &r->src.addr.v.a.addr,
693 &r->src.addr.v.a.mask, daddr, pd->af);
694 break;
695 }
696 break;
697 case PF_RDR: {
698 if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
699 goto notrans;
700 if ((r->rpool.opts & PF_POOL_TYPEMASK) == PF_POOL_BITMASK)
701 PF_POOLMASK(naddr, naddr, &r->rpool.cur->addr.v.a.mask,
702 daddr, pd->af);
703
704 if (r->rpool.proxy_port[1]) {
705 uint32_t tmp_nport;
706
707 tmp_nport = ((ntohs(dport) - ntohs(r->dst.port[0])) %
708 (r->rpool.proxy_port[1] - r->rpool.proxy_port[0] +
709 1)) + r->rpool.proxy_port[0];
710
711 /* Wrap around if necessary. */
712 if (tmp_nport > 65535)
713 tmp_nport -= 65535;
714 *nport = htons((uint16_t)tmp_nport);
715 } else if (r->rpool.proxy_port[0])
716 *nport = htons(r->rpool.proxy_port[0]);
717 break;
718 }
719 default:
720 panic("%s: unknown action %u", __func__, r->action);
721 }
722
723 /* Return success only if translation really happened. */
724 if (bcmp(*skp, *nkp, sizeof(struct pf_state_key_cmp)))
725 return (r);
726
727 notrans:
728 uma_zfree(V_pf_state_key_z, *nkp);
729 uma_zfree(V_pf_state_key_z, *skp);
730 *skp = *nkp = NULL;
731 *sn = NULL;
732
733 return (NULL);
734 }
Cache object: abd2056adf7268487e059e0ffd3eb23d
|