1 /* $OpenBSD: virtual.c,v 1.33 2019/06/28 13:32:44 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 2004 H�kan Olsson. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/types.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <sys/sockio.h>
31 #include <net/if.h>
32 #include <netinet/in.h>
33 #include <netinet6/in6_var.h>
34 #include <arpa/inet.h>
35 #include <ctype.h>
36 #include <limits.h>
37 #include <netdb.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #include "conf.h"
43 #include "if.h"
44 #include "exchange.h"
45 #include "log.h"
46 #include "message.h"
47 #include "nat_traversal.h"
48 #include "transport.h"
49 #include "virtual.h"
50 #include "udp.h"
51 #include "util.h"
52
53 #include "udp_encap.h"
54
55 static struct transport *virtual_bind(const struct sockaddr *);
56 static struct transport *virtual_bind_ADDR_ANY(sa_family_t);
57 static int virtual_bind_if(char *, struct sockaddr *, void *);
58 static struct transport *virtual_clone(struct transport *, struct sockaddr *);
59 static struct transport *virtual_create(char *);
60 static char *virtual_decode_ids (struct transport *);
61 static void virtual_get_dst(struct transport *,
62 struct sockaddr **);
63 static struct msg_head *virtual_get_queue(struct message *);
64 static void virtual_get_src(struct transport *,
65 struct sockaddr **);
66 static void virtual_handle_message(struct transport *);
67 static void virtual_reinit(void);
68 static void virtual_remove(struct transport *);
69 static void virtual_report(struct transport *);
70 static int virtual_send_message(struct message *,
71 struct transport *);
72
73 static struct transport_vtbl virtual_transport_vtbl = {
74 { 0 }, "udp",
75 virtual_create,
76 virtual_reinit,
77 virtual_remove,
78 virtual_report,
79 0,
80 0,
81 virtual_handle_message,
82 virtual_send_message,
83 virtual_get_dst,
84 virtual_get_src,
85 virtual_decode_ids,
86 virtual_clone,
87 virtual_get_queue
88 };
89
90 static LIST_HEAD (virtual_listen_list, virtual_transport) virtual_listen_list;
91 static struct transport *default_transport, *default_transport6;
92
93 void
virtual_init(void)94 virtual_init(void)
95 {
96 struct conf_list *listen_on;
97
98 LIST_INIT(&virtual_listen_list);
99
100 transport_method_add(&virtual_transport_vtbl);
101
102 /* Bind the ISAKMP port(s) on all network interfaces we have. */
103 if (if_map(virtual_bind_if, 0) == -1)
104 log_fatal("virtual_init: "
105 "could not bind the ISAKMP port(s) on all interfaces");
106
107 /* Only listen to the specified address if Listen-on is configured */
108 listen_on = conf_get_list("General", "Listen-on");
109 if (listen_on) {
110 LOG_DBG((LOG_TRANSPORT, 50,
111 "virtual_init: not binding ISAKMP port(s) to ADDR_ANY"));
112 conf_free_list(listen_on);
113 return;
114 }
115
116 /*
117 * Bind to INADDR_ANY in case of new addresses popping up.
118 * Packet reception on this transport is taken as a hint to reprobe the
119 * interface list.
120 */
121 if (!bind_family || (bind_family & BIND_FAMILY_INET4)) {
122 default_transport = virtual_bind_ADDR_ANY(AF_INET);
123 if (!default_transport)
124 return;
125 LIST_INSERT_HEAD(&virtual_listen_list,
126 (struct virtual_transport *)default_transport, link);
127 transport_reference(default_transport);
128 }
129
130 if (!bind_family || (bind_family & BIND_FAMILY_INET6)) {
131 default_transport6 = virtual_bind_ADDR_ANY(AF_INET6);
132 if (!default_transport6)
133 return;
134 LIST_INSERT_HEAD(&virtual_listen_list,
135 (struct virtual_transport *)default_transport6, link);
136 transport_reference(default_transport6);
137 }
138 }
139
140 struct virtual_transport *
virtual_get_default(sa_family_t af)141 virtual_get_default(sa_family_t af)
142 {
143 switch (af) {
144 case AF_INET:
145 return (struct virtual_transport *)default_transport;
146 case AF_INET6:
147 return (struct virtual_transport *)default_transport6;
148 default:
149 return 0;
150 }
151 }
152
153 /*
154 * Probe the interface list and determine what new interfaces have
155 * appeared.
156 *
157 * At the same time, we try to determine whether existing interfaces have
158 * been rendered invalid; we do this by marking all virtual transports before
159 * we call virtual_bind_if() through if_map(), and then releasing those
160 * transports that have not been unmarked.
161 */
162 void
virtual_reinit(void)163 virtual_reinit(void)
164 {
165 struct virtual_transport *v, *v2;
166
167 /* Mark all UDP transports, except the default ones. */
168 for (v = LIST_FIRST(&virtual_listen_list); v; v = LIST_NEXT(v, link))
169 if (&v->transport != default_transport &&
170 &v->transport != default_transport6)
171 v->transport.flags |= TRANSPORT_MARK;
172
173 /* Re-probe interface list. */
174 if (if_map(virtual_bind_if, 0) == -1)
175 log_print("virtual_init: "
176 "could not bind the ISAKMP port(s) on all interfaces");
177
178 /*
179 * Release listening transports for local addresses that no
180 * longer exist. virtual_bind_if () will have left those still marked.
181 */
182 v = LIST_FIRST(&virtual_listen_list);
183 while (v) {
184 v2 = LIST_NEXT(v, link);
185 if (v->transport.flags & TRANSPORT_MARK) {
186 LIST_REMOVE(v, link);
187 transport_release(&v->transport);
188 }
189 v = v2;
190 }
191 }
192
193 struct virtual_transport *
virtual_listen_lookup(struct sockaddr * addr)194 virtual_listen_lookup(struct sockaddr *addr)
195 {
196 struct virtual_transport *v;
197 struct udp_transport *u;
198
199 for (v = LIST_FIRST(&virtual_listen_list); v;
200 v = LIST_NEXT(v, link)) {
201 if (!(u = (struct udp_transport *)v->main))
202 if (!(u = (struct udp_transport *)v->encap)) {
203 log_print("virtual_listen_lookup: "
204 "virtual %p has no low-level transports",
205 v);
206 continue;
207 }
208
209 if (u->src->sa_family == addr->sa_family &&
210 sockaddr_addrlen(u->src) == sockaddr_addrlen(addr) &&
211 memcmp(sockaddr_addrdata (u->src), sockaddr_addrdata(addr),
212 sockaddr_addrlen(addr)) == 0)
213 return v;
214 }
215
216 LOG_DBG((LOG_TRANSPORT, 40, "virtual_listen_lookup: no match"));
217 return 0;
218 }
219
220 /*
221 * Initialize an object of the VIRTUAL transport class.
222 */
223 static struct transport *
virtual_bind(const struct sockaddr * addr)224 virtual_bind(const struct sockaddr *addr)
225 {
226 struct virtual_transport *v;
227 struct sockaddr_storage tmp_sa;
228 char *stport;
229 in_port_t port;
230
231 v = calloc(1, sizeof *v);
232 if (!v) {
233 log_error("virtual_bind: calloc(1, %lu) failed",
234 (unsigned long)sizeof *v);
235 return 0;
236 }
237
238 v->transport.vtbl = &virtual_transport_vtbl;
239
240 memcpy(&tmp_sa, addr, SA_LEN(addr));
241
242 /* Get port. */
243 stport = udp_default_port ? udp_default_port : UDP_DEFAULT_PORT_STR;
244 port = text2port(stport);
245 if (port == 0) {
246 log_print("virtual_bind: bad port \"%s\"", stport);
247 free(v);
248 return 0;
249 }
250
251 sockaddr_set_port((struct sockaddr *)&tmp_sa, port);
252 v->main = udp_bind((struct sockaddr *)&tmp_sa);
253 if (!v->main) {
254 free(v);
255 return 0;
256 }
257 v->main->virtual = (struct transport *)v;
258
259 if (!disable_nat_t) {
260 memcpy(&tmp_sa, addr, SA_LEN(addr));
261
262 /* Get port. */
263 stport = udp_encap_default_port
264 ? udp_encap_default_port : UDP_ENCAP_DEFAULT_PORT_STR;
265 port = text2port(stport);
266 if (port == 0) {
267 log_print("virtual_bind: bad encap port \"%s\"",
268 stport);
269 v->main->vtbl->remove(v->main);
270 free(v);
271 return 0;
272 }
273
274 sockaddr_set_port((struct sockaddr *)&tmp_sa, port);
275 v->encap = udp_encap_bind((struct sockaddr *)&tmp_sa);
276 if (!v->encap) {
277 v->main->vtbl->remove(v->main);
278 free(v);
279 return 0;
280 }
281 v->encap->virtual = (struct transport *)v;
282 }
283 v->encap_is_active = 0;
284
285 transport_setup(&v->transport, 1);
286 v->transport.flags |= TRANSPORT_LISTEN;
287
288 return (struct transport *)v;
289 }
290
291 static struct transport *
virtual_bind_ADDR_ANY(sa_family_t af)292 virtual_bind_ADDR_ANY(sa_family_t af)
293 {
294 struct sockaddr_storage dflt_stor;
295 struct sockaddr_in *d4 = (struct sockaddr_in *)&dflt_stor;
296 struct sockaddr_in6 *d6 = (struct sockaddr_in6 *)&dflt_stor;
297 struct transport *t;
298 struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
299
300 bzero(&dflt_stor, sizeof dflt_stor);
301 switch (af) {
302 case AF_INET:
303 d4->sin_family = af;
304 d4->sin_len = sizeof(struct sockaddr_in);
305 d4->sin_addr.s_addr = INADDR_ANY;
306 break;
307
308 case AF_INET6:
309 d6->sin6_family = af;
310 d6->sin6_len = sizeof(struct sockaddr_in6);
311 memcpy(&d6->sin6_addr.s6_addr, &in6addr_any,
312 sizeof in6addr_any);
313 break;
314 }
315
316 t = virtual_bind((struct sockaddr *)&dflt_stor);
317 if (!t)
318 log_error("virtual_bind_ADDR_ANY: "
319 "could not allocate default IPv%s ISAKMP port(s)",
320 af == AF_INET ? "4" : "6");
321 return t;
322 }
323
324 static int
virtual_bind_if(char * ifname,struct sockaddr * if_addr,void * arg)325 virtual_bind_if(char *ifname, struct sockaddr *if_addr, void *arg)
326 {
327 struct conf_list *listen_on;
328 struct virtual_transport *v;
329 struct conf_list_node *address;
330 struct sockaddr *addr;
331 struct transport *t;
332 struct ifreq flags_ifr;
333 struct in6_ifreq flags_ifr6;
334 char *addr_str;
335 int s, error;
336
337 if (sockaddr2text(if_addr, &addr_str, 0))
338 addr_str = 0;
339
340 LOG_DBG((LOG_TRANSPORT, 90,
341 "virtual_bind_if: interface %s family %s address %s",
342 ifname ? ifname : "<unknown>",
343 if_addr->sa_family == AF_INET ? "v4" :
344 (if_addr->sa_family == AF_INET6 ? "v6" : "<unknown>"),
345 addr_str ? addr_str : "<invalid>"));
346 free(addr_str);
347
348 /*
349 * Drop non-Internet stuff.
350 */
351 if ((if_addr->sa_family != AF_INET ||
352 SA_LEN(if_addr) != sizeof (struct sockaddr_in)) &&
353 (if_addr->sa_family != AF_INET6 ||
354 SA_LEN(if_addr) != sizeof (struct sockaddr_in6)))
355 return 0;
356
357 /*
358 * Only create sockets for families we should listen to.
359 */
360 if (bind_family)
361 switch (if_addr->sa_family) {
362 case AF_INET:
363 if ((bind_family & BIND_FAMILY_INET4) == 0)
364 return 0;
365 break;
366 case AF_INET6:
367 if ((bind_family & BIND_FAMILY_INET6) == 0)
368 return 0;
369 break;
370 default:
371 return 0;
372 }
373
374 /*
375 * These special addresses are not useable as they have special meaning
376 * in the IP stack.
377 */
378 if (if_addr->sa_family == AF_INET &&
379 (((struct sockaddr_in *)if_addr)->sin_addr.s_addr == INADDR_ANY ||
380 (((struct sockaddr_in *)if_addr)->sin_addr.s_addr == INADDR_NONE)))
381 return 0;
382
383 /*
384 * Go through the list of transports and see if we already have this
385 * address bound. If so, unmark the transport and skip it; this allows
386 * us to call this function when we suspect a new address has appeared.
387 */
388 if ((v = virtual_listen_lookup(if_addr)) != 0) {
389 LOG_DBG ((LOG_TRANSPORT, 90, "virtual_bind_if: "
390 "already bound"));
391 v->transport.flags &= ~TRANSPORT_MARK;
392 return 0;
393 }
394
395 /*
396 * Don't bother with interfaces that are down.
397 * Note: This socket is only used to collect the interface status,
398 * rtables and inet6 addresses.
399 */
400 s = socket(if_addr->sa_family, SOCK_DGRAM, 0);
401 if (s == -1) {
402 log_error("virtual_bind_if: "
403 "socket (%d, SOCK_DGRAM, 0) failed", if_addr->sa_family);
404 return -1;
405 }
406 strlcpy(flags_ifr.ifr_name, ifname, sizeof flags_ifr.ifr_name);
407 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&flags_ifr) == -1) {
408 log_error("virtual_bind_if: "
409 "ioctl (%d, SIOCGIFFLAGS, ...) failed", s);
410 close(s);
411 return -1;
412 }
413 if (!(flags_ifr.ifr_flags & IFF_UP)) {
414 close(s);
415 return 0;
416 }
417 /* Also skip tentative addresses during DAD since bind(2) would fail. */
418 if (if_addr->sa_family == AF_INET6) {
419 memset(&flags_ifr6, 0, sizeof(flags_ifr6));
420 strlcpy(flags_ifr6.ifr_name, ifname, sizeof flags_ifr6.ifr_name);
421 flags_ifr6.ifr_addr = *(struct sockaddr_in6 *)if_addr;
422 if (ioctl(s, SIOCGIFAFLAG_IN6, (caddr_t)&flags_ifr6) == -1) {
423 log_error("virtual_bind_if: "
424 "ioctl (%d, SIOCGIFAFLAG_IN6, ...) failed", s);
425 close(s);
426 return 0;
427 }
428 if (flags_ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_ANYCAST|
429 IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED|IN6_IFF_DETACHED)) {
430 error = sockaddr2text(if_addr, &addr_str, 0);
431 log_print("virtual_bind_if: "
432 "IPv6 address %s not ready (flags 0x%x)",
433 error ? "unknown" : addr_str,
434 flags_ifr6.ifr_ifru.ifru_flags6);
435 /* XXX schedule an interface rescan */
436 if (!error)
437 free(addr_str);
438 close(s);
439 return 0;
440 }
441 }
442
443 if (ioctl(s, SIOCGIFRDOMAIN, (caddr_t)&flags_ifr) == -1) {
444 log_error("virtual_bind_if: "
445 "ioctl (%d, SIOCGIFRDOMAIN, ...) failed", s);
446 close(s);
447 return -1;
448 }
449
450 /*
451 * Ignore interfaces outside of our rtable
452 */
453 if (getrtable() != flags_ifr.ifr_rdomainid) {
454 close(s);
455 return 0;
456 }
457
458 close(s);
459
460 /* Set the port number to zero. */
461 switch (if_addr->sa_family) {
462 case AF_INET:
463 ((struct sockaddr_in *)if_addr)->sin_port = htons(0);
464 break;
465 case AF_INET6:
466 ((struct sockaddr_in6 *)if_addr)->sin6_port = htons(0);
467 break;
468 default:
469 log_print("virtual_bind_if: unsupported protocol family %d",
470 if_addr->sa_family);
471 break;
472 }
473
474 /*
475 * If we are explicit about what addresses we can listen to, be sure
476 * to respect that option.
477 * This is quite wasteful redoing the list-run for every interface,
478 * but who cares? This is not an operation that needs to be fast.
479 */
480 listen_on = conf_get_list("General", "Listen-on");
481 if (listen_on) {
482 for (address = TAILQ_FIRST(&listen_on->fields); address;
483 address = TAILQ_NEXT(address, link)) {
484 if (text2sockaddr(address->field, 0, &addr, 0, 0)) {
485 log_print("virtual_bind_if: "
486 "invalid address %s in \"Listen-on\"",
487 address->field);
488 continue;
489 }
490
491 /* If found, take the easy way out. */
492 if (memcmp(addr, if_addr, SA_LEN(addr)) == 0) {
493 free(addr);
494 break;
495 }
496 free(addr);
497 }
498 conf_free_list(listen_on);
499
500 /*
501 * If address is zero then we did not find the address among
502 * the ones we should listen to.
503 * XXX We do not discover if we do not find our listen
504 * addresses. Maybe this should be the other way round.
505 */
506 if (!address)
507 return 0;
508 }
509
510 t = virtual_bind(if_addr);
511 if (!t) {
512 error = sockaddr2text(if_addr, &addr_str, 0);
513 log_print("virtual_bind_if: failed to create a socket on %s",
514 error ? "unknown" : addr_str);
515 if (!error)
516 free(addr_str);
517 return -1;
518 }
519 LIST_INSERT_HEAD(&virtual_listen_list, (struct virtual_transport *)t,
520 link);
521 transport_reference(t);
522 return 0;
523 }
524
525 static struct transport *
virtual_clone(struct transport * vt,struct sockaddr * raddr)526 virtual_clone(struct transport *vt, struct sockaddr *raddr)
527 {
528 struct virtual_transport *v = (struct virtual_transport *)vt;
529 struct virtual_transport *v2;
530 struct transport *t;
531 char *stport;
532 in_port_t port;
533
534 t = malloc(sizeof *v);
535 if (!t) {
536 log_error("virtual_clone: malloc(%lu) failed",
537 (unsigned long)sizeof *v);
538 return 0;
539 }
540 v2 = (struct virtual_transport *)t;
541
542 memcpy(v2, v, sizeof *v);
543 /* Remove the copy's links into virtual_listen_list. */
544 memset(&v2->link, 0, sizeof v2->link);
545
546 if (v->encap_is_active)
547 v2->main = 0; /* No need to clone this. */
548 else {
549 v2->main = v->main->vtbl->clone(v->main, raddr);
550 v2->main->virtual = (struct transport *)v2;
551 }
552 if (!disable_nat_t) {
553 stport = udp_encap_default_port ? udp_encap_default_port :
554 UDP_ENCAP_DEFAULT_PORT_STR;
555 port = text2port(stport);
556 if (port == 0) {
557 log_print("virtual_clone: port string \"%s\" not convertible "
558 "to in_port_t", stport);
559 free(t);
560 return 0;
561 }
562 sockaddr_set_port(raddr, port);
563 v2->encap = v->encap->vtbl->clone(v->encap, raddr);
564 v2->encap->virtual = (struct transport *)v2;
565 }
566 LOG_DBG((LOG_TRANSPORT, 50, "virtual_clone: old %p new %p (%s is %p)",
567 v, t, v->encap_is_active ? "encap" : "main",
568 v->encap_is_active ? v2->encap : v2->main));
569
570 t->flags &= ~TRANSPORT_LISTEN;
571 transport_setup(t, 1);
572 return t;
573 }
574
575 static struct transport *
virtual_create(char * name)576 virtual_create(char *name)
577 {
578 struct virtual_transport *v;
579 struct transport *t, *t2 = 0;
580
581 t = transport_create("udp_physical", name);
582 if (!t)
583 return 0;
584
585 if (!disable_nat_t) {
586 t2 = transport_create("udp_encap", name);
587 if (!t2) {
588 t->vtbl->remove(t);
589 return 0;
590 }
591 }
592
593 v = calloc(1, sizeof *v);
594 if (!v) {
595 log_error("virtual_create: calloc(1, %lu) failed",
596 (unsigned long)sizeof *v);
597 t->vtbl->remove(t);
598 if (t2)
599 t2->vtbl->remove(t2);
600 return 0;
601 }
602
603 memcpy(v, t, sizeof *t);
604 v->transport.virtual = 0;
605 v->main = t;
606 v->encap = t2;
607 v->transport.vtbl = &virtual_transport_vtbl;
608 t->virtual = (struct transport *)v;
609 if (t2)
610 t2->virtual = (struct transport *)v;
611 transport_setup(&v->transport, 1);
612 return (struct transport *)v;
613 }
614
615 static void
virtual_remove(struct transport * t)616 virtual_remove(struct transport *t)
617 {
618 struct virtual_transport *p, *v = (struct virtual_transport *)t;
619
620 if (v->encap)
621 v->encap->vtbl->remove(v->encap);
622 if (v->main)
623 v->main->vtbl->remove(v->main);
624
625 for (p = LIST_FIRST(&virtual_listen_list); p && p != v; p =
626 LIST_NEXT(p, link))
627 ;
628 if (p == v)
629 LIST_REMOVE(v, link);
630
631 LOG_DBG((LOG_TRANSPORT, 90, "virtual_remove: removed %p", v));
632 free(t);
633 }
634
635 static void
virtual_report(struct transport * t)636 virtual_report(struct transport *t)
637 {
638 }
639
640 static void
virtual_handle_message(struct transport * t)641 virtual_handle_message(struct transport *t)
642 {
643 /*
644 * As per the NAT-T draft, in case we have already switched ports,
645 * any messages received on the old (500) port SHOULD be discarded.
646 * (Actually, while phase 1 messages should be discarded,
647 * informational exchanges MAY be processed normally. For now, we
648 * discard them all.)
649 */
650 if (((struct virtual_transport *)t->virtual)->encap_is_active &&
651 ((struct virtual_transport *)t->virtual)->main == t) {
652 LOG_DBG((LOG_MESSAGE, 10, "virtual_handle_message: "
653 "message on old port discarded"));
654 return;
655 }
656
657 t->vtbl->handle_message(t);
658 }
659
660 static int
virtual_send_message(struct message * msg,struct transport * t)661 virtual_send_message(struct message *msg, struct transport *t)
662 {
663 struct virtual_transport *v =
664 (struct virtual_transport *)msg->transport;
665 struct sockaddr *dst;
666 in_port_t port, default_port;
667
668 /*
669 * Activate NAT-T Encapsulation if
670 * - the exchange says we can, and
671 * - in ID_PROT, after step 4 (draft-ietf-ipsec-nat-t-ike-03), or
672 * - in other exchange (Aggressive, ), asap
673 * XXX ISAKMP_EXCH_BASE etc?
674 */
675
676 if (msg->flags & MSG_NATT) {
677 msg->exchange->flags |= EXCHANGE_FLAG_NAT_T_ENABLE;
678 msg->exchange->flags |= EXCHANGE_FLAG_NAT_T_CAP_PEER;
679 }
680
681 if ((v->encap_is_active == 0 &&
682 (msg->exchange->flags & EXCHANGE_FLAG_NAT_T_ENABLE) &&
683 (msg->exchange->type != ISAKMP_EXCH_ID_PROT ||
684 msg->exchange->step > 4)) || (msg->flags & MSG_NATT)) {
685 LOG_DBG((LOG_MESSAGE, 10, "virtual_send_message: "
686 "enabling NAT-T encapsulation for this exchange"));
687 v->encap_is_active++;
688
689 /* Copy destination port if it is translated (NAT). */
690 v->main->vtbl->get_dst(v->main, &dst);
691 port = ntohs(sockaddr_port(dst));
692
693 if (udp_default_port)
694 default_port = text2port(udp_default_port);
695 else
696 default_port = UDP_DEFAULT_PORT;
697 if (port != default_port) {
698 v->main->vtbl->get_dst(v->encap, &dst);
699 sockaddr_set_port(dst, port);
700 }
701 }
702
703 if (v->encap_is_active)
704 return v->encap->vtbl->send_message(msg, v->encap);
705 else
706 return v->main->vtbl->send_message(msg, v->main);
707 }
708
709 static void
virtual_get_src(struct transport * t,struct sockaddr ** s)710 virtual_get_src(struct transport *t, struct sockaddr **s)
711 {
712 struct virtual_transport *v = (struct virtual_transport *)t;
713
714 if (v->encap_is_active)
715 v->encap->vtbl->get_src(v->encap, s);
716 else
717 v->main->vtbl->get_src(v->main, s);
718 }
719
720 static void
virtual_get_dst(struct transport * t,struct sockaddr ** s)721 virtual_get_dst(struct transport *t, struct sockaddr **s)
722 {
723 struct virtual_transport *v = (struct virtual_transport *)t;
724
725 if (v->encap_is_active)
726 v->encap->vtbl->get_dst(v->encap, s);
727 else
728 v->main->vtbl->get_dst(v->main, s);
729 }
730
731 static char *
virtual_decode_ids(struct transport * t)732 virtual_decode_ids(struct transport *t)
733 {
734 struct virtual_transport *v = (struct virtual_transport *)t;
735
736 if (v->encap_is_active)
737 return v->encap->vtbl->decode_ids(t);
738 else
739 return v->main->vtbl->decode_ids(t);
740 }
741
742 static struct msg_head *
virtual_get_queue(struct message * msg)743 virtual_get_queue(struct message *msg)
744 {
745 if (msg->flags & MSG_PRIORITIZED)
746 return &msg->transport->prio_sendq;
747 else
748 return &msg->transport->sendq;
749 }
750