1 /* $FreeBSD: releng/5.0/sys/netipsec/ipsec_output.c 105197 2002-10-16 02:10:08Z sam $ */
2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
3
4 /*
5 * IPsec output processing.
6 */
7 #include "opt_inet.h"
8 #include "opt_inet6.h"
9 #include "opt_ipsec.h"
10
11 #include <sys/param.h>
12 #include <sys/systm.h>
13 #include <sys/mbuf.h>
14 #include <sys/domain.h>
15 #include <sys/protosw.h>
16 #include <sys/socket.h>
17 #include <sys/errno.h>
18 #include <sys/syslog.h>
19
20 #include <net/if.h>
21 #include <net/route.h>
22
23 #include <netinet/in.h>
24 #include <netinet/in_systm.h>
25 #include <netinet/ip.h>
26 #include <netinet/ip_var.h>
27 #include <netinet/in_var.h>
28 #include <netinet/ip_ecn.h>
29 #ifdef INET6
30 #include <netinet6/ip6_ecn.h>
31 #endif
32
33 #include <netinet/ip6.h>
34 #ifdef INET6
35 #include <netinet6/ip6_var.h>
36 #endif
37 #include <netinet/in_pcb.h>
38 #ifdef INET6
39 #include <netinet/icmp6.h>
40 #endif
41
42 #include <netipsec/ipsec.h>
43 #ifdef INET6
44 #include <netipsec/ipsec6.h>
45 #endif
46 #include <netipsec/ah_var.h>
47 #include <netipsec/esp_var.h>
48 #include <netipsec/ipcomp_var.h>
49
50 #include <netipsec/xform.h>
51
52 #include <netipsec/key.h>
53 #include <netipsec/keydb.h>
54 #include <netipsec/key_debug.h>
55
56 #include <machine/in_cksum.h>
57
58 int
59 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
60 {
61 struct tdb_ident *tdbi;
62 struct m_tag *mtag;
63 struct secasvar *sav;
64 struct secasindex *saidx;
65 int error;
66
67 #if 0
68 SPLASSERT(net, "ipsec_process_done");
69 #endif
70
71 KASSERT(m != NULL, ("ipsec_process_done: null mbuf"));
72 KASSERT(isr != NULL, ("ipsec_process_done: null ISR"));
73 sav = isr->sav;
74 KASSERT(sav != NULL, ("ipsec_process_done: null SA"));
75 KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH"));
76
77 saidx = &sav->sah->saidx;
78 switch (saidx->dst.sa.sa_family) {
79 #ifdef INET
80 case AF_INET:
81 /* Fix the header length, for AH processing. */
82 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
83 break;
84 #endif /* INET */
85 #ifdef INET6
86 case AF_INET6:
87 /* Fix the header length, for AH processing. */
88 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
89 error = ENXIO;
90 goto bad;
91 }
92 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
93 /* No jumbogram support. */
94 error = ENXIO; /*?*/
95 goto bad;
96 }
97 mtod(m, struct ip6_hdr *)->ip6_plen =
98 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
99 break;
100 #endif /* INET6 */
101 default:
102 DPRINTF(("ipsec_process_done: unknown protocol family %u\n",
103 saidx->dst.sa.sa_family));
104 error = ENXIO;
105 goto bad;
106 }
107
108 /*
109 * Add a record of what we've done or what needs to be done to the
110 * packet.
111 */
112 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
113 sizeof(struct tdb_ident), M_NOWAIT);
114 if (mtag == NULL) {
115 DPRINTF(("ipsec_process_done: could not get packet tag\n"));
116 error = ENOMEM;
117 goto bad;
118 }
119
120 tdbi = (struct tdb_ident *)(mtag + 1);
121 tdbi->dst = saidx->dst;
122 tdbi->proto = saidx->proto;
123 tdbi->spi = sav->spi;
124 m_tag_prepend(m, mtag);
125
126 /*
127 * If there's another (bundled) SA to apply, do so.
128 * Note that this puts a burden on the kernel stack size.
129 * If this is a problem we'll need to introduce a queue
130 * to set the packet on so we can unwind the stack before
131 * doing further processing.
132 */
133 if (isr->next) {
134 newipsecstat.ips_out_bundlesa++;
135 return ipsec4_process_packet(m, isr->next, 0, 0);
136 }
137
138 /*
139 * We're done with IPsec processing, transmit the packet using the
140 * appropriate network protocol (IP or IPv6). SPD lookup will be
141 * performed again there.
142 */
143 switch (saidx->dst.sa.sa_family) {
144 #ifdef INET
145 struct ip *ip;
146 case AF_INET:
147 ip = mtod(m, struct ip *);
148 ip->ip_len = ntohs(ip->ip_len);
149 ip->ip_off = ntohs(ip->ip_off);
150
151 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
152 #endif /* INET */
153 #ifdef INET6
154 case AF_INET6:
155 /*
156 * We don't need massage, IPv6 header fields are always in
157 * net endian.
158 */
159 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
160 #endif /* INET6 */
161 }
162 panic("ipsec_process_done");
163 bad:
164 m_freem(m);
165 KEY_FREESAV(&sav);
166 return (error);
167 }
168
169 static struct ipsecrequest *
170 ipsec_nextisr(
171 struct mbuf *m,
172 struct ipsecrequest *isr,
173 int af,
174 struct secasindex *saidx,
175 int *error
176 )
177 {
178 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
179 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
180 struct secasvar *sav;
181
182 #if 0
183 SPLASSERT(net, "ipsec_nextisr");
184 #endif
185 KASSERT(af == AF_INET || af == AF_INET6,
186 ("ipsec_nextisr: invalid address family %u", af));
187 again:
188 /*
189 * Craft SA index to search for proper SA. Note that
190 * we only fillin unspecified SA peers for transport
191 * mode; for tunnel mode they must already be filled in.
192 */
193 *saidx = isr->saidx;
194 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
195 /* Fillin unspecified SA peers only for transport mode */
196 if (af == AF_INET) {
197 struct sockaddr_in *sin;
198 struct ip *ip = mtod(m, struct ip *);
199
200 if (saidx->src.sa.sa_len == 0) {
201 sin = &saidx->src.sin;
202 sin->sin_len = sizeof(*sin);
203 sin->sin_family = AF_INET;
204 sin->sin_port = IPSEC_PORT_ANY;
205 sin->sin_addr = ip->ip_src;
206 }
207 if (saidx->dst.sa.sa_len == 0) {
208 sin = &saidx->dst.sin;
209 sin->sin_len = sizeof(*sin);
210 sin->sin_family = AF_INET;
211 sin->sin_port = IPSEC_PORT_ANY;
212 sin->sin_addr = ip->ip_dst;
213 }
214 } else {
215 struct sockaddr_in6 *sin6;
216 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
217
218 if (saidx->src.sin6.sin6_len == 0) {
219 sin6 = (struct sockaddr_in6 *)&saidx->src;
220 sin6->sin6_len = sizeof(*sin6);
221 sin6->sin6_family = AF_INET6;
222 sin6->sin6_port = IPSEC_PORT_ANY;
223 sin6->sin6_addr = ip6->ip6_src;
224 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
225 /* fix scope id for comparing SPD */
226 sin6->sin6_addr.s6_addr16[1] = 0;
227 sin6->sin6_scope_id =
228 ntohs(ip6->ip6_src.s6_addr16[1]);
229 }
230 }
231 if (saidx->dst.sin6.sin6_len == 0) {
232 sin6 = (struct sockaddr_in6 *)&saidx->dst;
233 sin6->sin6_len = sizeof(*sin6);
234 sin6->sin6_family = AF_INET6;
235 sin6->sin6_port = IPSEC_PORT_ANY;
236 sin6->sin6_addr = ip6->ip6_dst;
237 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
238 /* fix scope id for comparing SPD */
239 sin6->sin6_addr.s6_addr16[1] = 0;
240 sin6->sin6_scope_id =
241 ntohs(ip6->ip6_dst.s6_addr16[1]);
242 }
243 }
244 }
245 }
246
247 /*
248 * Lookup SA and validate it.
249 */
250 *error = key_checkrequest(isr, saidx);
251 if (*error != 0) {
252 /*
253 * IPsec processing is required, but no SA found.
254 * I assume that key_acquire() had been called
255 * to get/establish the SA. Here I discard
256 * this packet because it is responsibility for
257 * upper layer to retransmit the packet.
258 */
259 newipsecstat.ips_out_nosa++;
260 goto bad;
261 }
262 sav = isr->sav;
263 if (sav == NULL) { /* XXX valid return */
264 KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
265 ("ipsec_nextisr: no SA found, but required; level %u",
266 ipsec_get_reqlevel(isr)));
267 isr = isr->next;
268 if (isr == NULL) {
269 /*XXXstatistic??*/
270 *error = EINVAL; /*XXX*/
271 return isr;
272 }
273 goto again;
274 }
275
276 /*
277 * Check system global policy controls.
278 */
279 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
280 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
281 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
282 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due"
283 " to policy (check your sysctls)\n"));
284 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
285 ipcompstat.ipcomps_pdrops);
286 *error = EHOSTUNREACH;
287 goto bad;
288 }
289
290 /*
291 * Sanity check the SA contents for the caller
292 * before they invoke the xform output method.
293 */
294 if (sav->tdb_xform == NULL) {
295 DPRINTF(("ipsec_nextisr: no transform for SA\n"));
296 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
297 ipcompstat.ipcomps_noxform);
298 *error = EHOSTUNREACH;
299 goto bad;
300 }
301 return isr;
302 bad:
303 KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code"));
304 return NULL;
305 #undef IPSEC_OSTAT
306 }
307
308 #ifdef INET
309 /*
310 * IPsec output logic for IPv4.
311 */
312 int
313 ipsec4_process_packet(
314 struct mbuf *m,
315 struct ipsecrequest *isr,
316 int flags,
317 int tunalready)
318 {
319 struct secasindex saidx;
320 struct secasvar *sav;
321 struct ip *ip;
322 int s, error, i, off;
323
324 KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf"));
325 KASSERT(isr != NULL, ("ipsec4_process_packet: null isr"));
326
327 s = splnet(); /* insure SA contents don't change */
328
329 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
330 if (isr == NULL)
331 goto bad;
332
333 sav = isr->sav;
334 if (!tunalready) {
335 union sockaddr_union *dst = &sav->sah->saidx.dst;
336 int setdf;
337
338 /*
339 * Collect IP_DF state from the outer header.
340 */
341 if (dst->sa.sa_family == AF_INET) {
342 if (m->m_len < sizeof (struct ip) &&
343 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
344 error = ENOBUFS;
345 goto bad;
346 }
347 ip = mtod(m, struct ip *);
348 /* Honor system-wide control of how to handle IP_DF */
349 switch (ip4_ipsec_dfbit) {
350 case 0: /* clear in outer header */
351 case 1: /* set in outer header */
352 setdf = ip4_ipsec_dfbit;
353 break;
354 default: /* propagate to outer header */
355 setdf = ntohs(ip->ip_off & IP_DF);
356 break;
357 }
358 } else {
359 ip = NULL; /* keep compiler happy */
360 setdf = 0;
361 }
362 /* Do the appropriate encapsulation, if necessary */
363 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
364 dst->sa.sa_family != AF_INET || /* PF mismatch */
365 #if 0
366 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
367 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
368 #endif
369 (dst->sa.sa_family == AF_INET && /* Proxy */
370 dst->sin.sin_addr.s_addr != INADDR_ANY &&
371 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
372 struct mbuf *mp;
373
374 /* Fix IPv4 header checksum and length */
375 if (m->m_len < sizeof (struct ip) &&
376 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
377 error = ENOBUFS;
378 goto bad;
379 }
380 ip = mtod(m, struct ip *);
381 ip->ip_len = htons(m->m_pkthdr.len);
382 ip->ip_sum = 0;
383 #ifdef _IP_VHL
384 if (ip->ip_vhl == IP_VHL_BORING)
385 ip->ip_sum = in_cksum_hdr(ip);
386 else
387 ip->ip_sum = in_cksum(m,
388 _IP_VHL_HL(ip->ip_vhl) << 2);
389 #else
390 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
391 #endif
392
393 /* Encapsulate the packet */
394 error = ipip_output(m, isr, &mp, 0, 0);
395 if (mp == NULL && !error) {
396 /* Should never happen. */
397 DPRINTF(("ipsec4_process_packet: ipip_output "
398 "returns no mbuf and no error!"));
399 error = EFAULT;
400 }
401 if (error) {
402 if (mp)
403 m_freem(mp);
404 goto bad;
405 }
406 m = mp, mp = NULL;
407 /*
408 * ipip_output clears IP_DF in the new header. If
409 * we need to propagate IP_DF from the outer header,
410 * then we have to do it here.
411 *
412 * XXX shouldn't assume what ipip_output does.
413 */
414 if (dst->sa.sa_family == AF_INET && setdf) {
415 if (m->m_len < sizeof (struct ip) &&
416 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
417 error = ENOBUFS;
418 goto bad;
419 }
420 ip = mtod(m, struct ip *);
421 ip->ip_off = ntohs(ip->ip_off);
422 ip->ip_off |= IP_DF;
423 ip->ip_off = htons(ip->ip_off);
424 }
425 }
426 }
427
428 /*
429 * Dispatch to the appropriate IPsec transform logic. The
430 * packet will be returned for transmission after crypto
431 * processing, etc. are completed. For encapsulation we
432 * bypass this call because of the explicit call done above
433 * (necessary to deal with IP_DF handling for IPv4).
434 *
435 * NB: m & sav are ``passed to caller'' who's reponsible for
436 * for reclaiming their resources.
437 */
438 if (sav->tdb_xform->xf_type != XF_IP4) {
439 ip = mtod(m, struct ip *);
440 i = ip->ip_hl << 2;
441 off = offsetof(struct ip, ip_p);
442 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
443 } else {
444 error = ipsec_process_done(m, isr);
445 }
446 splx(s);
447 return error;
448 bad:
449 splx(s);
450 if (m)
451 m_freem(m);
452 return error;
453 }
454 #endif
455
456 #ifdef INET6
457 /*
458 * Chop IP6 header from the payload.
459 */
460 static struct mbuf *
461 ipsec6_splithdr(struct mbuf *m)
462 {
463 struct mbuf *mh;
464 struct ip6_hdr *ip6;
465 int hlen;
466
467 KASSERT(m->m_len >= sizeof (struct ip6_hdr),
468 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len));
469 ip6 = mtod(m, struct ip6_hdr *);
470 hlen = sizeof(struct ip6_hdr);
471 if (m->m_len > hlen) {
472 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
473 if (!mh) {
474 m_freem(m);
475 return NULL;
476 }
477 M_COPY_PKTHDR(mh, m);
478 MH_ALIGN(mh, hlen);
479 m->m_len -= hlen;
480 m->m_data += hlen;
481 mh->m_next = m;
482 m = mh;
483 m->m_len = hlen;
484 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
485 } else if (m->m_len < hlen) {
486 m = m_pullup(m, hlen);
487 if (!m)
488 return NULL;
489 }
490 return m;
491 }
492
493 /*
494 * IPsec output logic for IPv6, transport mode.
495 */
496 int
497 ipsec6_output_trans(
498 struct ipsec_output_state *state,
499 u_char *nexthdrp,
500 struct mbuf *mprev,
501 struct secpolicy *sp,
502 int flags,
503 int *tun)
504 {
505 struct ipsecrequest *isr;
506 struct secasindex saidx;
507 int error = 0;
508 struct mbuf *m;
509
510 KASSERT(state != NULL, ("ipsec6_output: null state"));
511 KASSERT(state->m != NULL, ("ipsec6_output: null m"));
512 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp"));
513 KASSERT(mprev != NULL, ("ipsec6_output: null mprev"));
514 KASSERT(sp != NULL, ("ipsec6_output: null sp"));
515 KASSERT(tun != NULL, ("ipsec6_output: null tun"));
516
517 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
518 printf("ipsec6_output_trans: applyed SP\n");
519 kdebug_secpolicy(sp));
520
521 isr = sp->req;
522 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
523 /* the rest will be handled by ipsec6_output_tunnel() */
524 *tun = 1; /* need tunnel-mode processing */
525 return 0;
526 }
527
528 *tun = 0;
529 m = state->m;
530
531 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
532 if (isr == NULL) {
533 #ifdef notdef
534 /* XXX should notification be done for all errors ? */
535 /*
536 * Notify the fact that the packet is discarded
537 * to ourselves. I believe this is better than
538 * just silently discarding. (jinmei@kame.net)
539 * XXX: should we restrict the error to TCP packets?
540 * XXX: should we directly notify sockets via
541 * pfctlinputs?
542 */
543 icmp6_error(m, ICMP6_DST_UNREACH,
544 ICMP6_DST_UNREACH_ADMIN, 0);
545 m = NULL; /* NB: icmp6_error frees mbuf */
546 #endif
547 goto bad;
548 }
549
550 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
551 sizeof (struct ip6_hdr),
552 offsetof(struct ip6_hdr, ip6_nxt));
553 bad:
554 if (m)
555 m_freem(m);
556 state->m = NULL;
557 return error;
558 }
559
560 static int
561 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
562 {
563 struct ip6_hdr *oip6;
564 struct ip6_hdr *ip6;
565 size_t plen;
566
567 /* can't tunnel between different AFs */
568 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
569 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
570 m_freem(m);
571 return EINVAL;
572 }
573 KASSERT(m->m_len != sizeof (struct ip6_hdr),
574 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len));
575
576
577 /*
578 * grow the mbuf to accomodate the new IPv6 header.
579 */
580 plen = m->m_pkthdr.len;
581 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
582 struct mbuf *n;
583 MGET(n, M_DONTWAIT, MT_DATA);
584 if (!n) {
585 m_freem(m);
586 return ENOBUFS;
587 }
588 n->m_len = sizeof(struct ip6_hdr);
589 n->m_next = m->m_next;
590 m->m_next = n;
591 m->m_pkthdr.len += sizeof(struct ip6_hdr);
592 oip6 = mtod(n, struct ip6_hdr *);
593 } else {
594 m->m_next->m_len += sizeof(struct ip6_hdr);
595 m->m_next->m_data -= sizeof(struct ip6_hdr);
596 m->m_pkthdr.len += sizeof(struct ip6_hdr);
597 oip6 = mtod(m->m_next, struct ip6_hdr *);
598 }
599 ip6 = mtod(m, struct ip6_hdr *);
600 ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
601
602 /* Fake link-local scope-class addresses */
603 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
604 oip6->ip6_src.s6_addr16[1] = 0;
605 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
606 oip6->ip6_dst.s6_addr16[1] = 0;
607
608 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
609 /* ECN consideration. */
610 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
611 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
612 ip6->ip6_plen = htons(plen);
613 else {
614 /* ip6->ip6_plen will be updated in ip6_output() */
615 }
616 ip6->ip6_nxt = IPPROTO_IPV6;
617 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src;
618 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst;
619 ip6->ip6_hlim = IPV6_DEFHLIM;
620
621 /* XXX Should ip6_src be updated later ? */
622
623 return 0;
624 }
625
626 /*
627 * IPsec output logic for IPv6, tunnel mode.
628 */
629 int
630 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
631 {
632 struct ip6_hdr *ip6;
633 struct ipsecrequest *isr;
634 struct secasindex saidx;
635 int error;
636 struct sockaddr_in6* dst6;
637 struct mbuf *m;
638
639 KASSERT(state != NULL, ("ipsec6_output: null state"));
640 KASSERT(state->m != NULL, ("ipsec6_output: null m"));
641 KASSERT(sp != NULL, ("ipsec6_output: null sp"));
642
643 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
644 printf("ipsec6_output_tunnel: applyed SP\n");
645 kdebug_secpolicy(sp));
646
647 m = state->m;
648 /*
649 * transport mode ipsec (before the 1st tunnel mode) is already
650 * processed by ipsec6_output_trans().
651 */
652 for (isr = sp->req; isr; isr = isr->next) {
653 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
654 break;
655 }
656 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
657 if (isr == NULL)
658 goto bad;
659
660 /*
661 * There may be the case that SA status will be changed when
662 * we are refering to one. So calling splsoftnet().
663 */
664 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
665 /*
666 * build IPsec tunnel.
667 */
668 /* XXX should be processed with other familiy */
669 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
670 ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
671 "family mismatched between inner and outer, spi=%u\n",
672 ntohl(isr->sav->spi)));
673 newipsecstat.ips_out_inval++;
674 error = EAFNOSUPPORT;
675 goto bad;
676 }
677
678 m = ipsec6_splithdr(m);
679 if (!m) {
680 newipsecstat.ips_out_nomem++;
681 error = ENOMEM;
682 goto bad;
683 }
684 error = ipsec6_encapsulate(m, isr->sav);
685 if (error) {
686 m = NULL;
687 goto bad;
688 }
689 ip6 = mtod(m, struct ip6_hdr *);
690
691 state->ro = &isr->sav->sah->sa_route;
692 state->dst = (struct sockaddr *)&state->ro->ro_dst;
693 dst6 = (struct sockaddr_in6 *)state->dst;
694 if (state->ro->ro_rt
695 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
696 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
697 RTFREE(state->ro->ro_rt);
698 state->ro->ro_rt = NULL;
699 }
700 if (state->ro->ro_rt == 0) {
701 bzero(dst6, sizeof(*dst6));
702 dst6->sin6_family = AF_INET6;
703 dst6->sin6_len = sizeof(*dst6);
704 dst6->sin6_addr = ip6->ip6_dst;
705 rtalloc(state->ro);
706 }
707 if (state->ro->ro_rt == 0) {
708 ip6stat.ip6s_noroute++;
709 newipsecstat.ips_out_noroute++;
710 error = EHOSTUNREACH;
711 goto bad;
712 }
713
714 /* adjust state->dst if tunnel endpoint is offlink */
715 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
716 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
717 dst6 = (struct sockaddr_in6 *)state->dst;
718 }
719 }
720
721 m = ipsec6_splithdr(m);
722 if (!m) {
723 newipsecstat.ips_out_nomem++;
724 error = ENOMEM;
725 goto bad;
726 }
727 ip6 = mtod(m, struct ip6_hdr *);
728 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
729 sizeof (struct ip6_hdr),
730 offsetof(struct ip6_hdr, ip6_nxt));
731 bad:
732 if (m)
733 m_freem(m);
734 state->m = NULL;
735 return error;
736 }
737 #endif /*INET6*/
Cache object: e850127db4a18a45d43277e791556f9d
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