1 /*-
2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/10/sys/netipsec/ipsec_output.c 283901 2015-06-02 03:14:42Z ae $
27 */
28
29 /*
30 * IPsec output processing.
31 */
32 #include "opt_inet.h"
33 #include "opt_inet6.h"
34 #include "opt_ipsec.h"
35 #include "opt_enc.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
44 #include <sys/syslog.h>
45
46 #include <net/if.h>
47 #include <net/pfil.h>
48 #include <net/vnet.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <netinet/ip_var.h>
54 #include <netinet/in_var.h>
55 #include <netinet/ip_ecn.h>
56 #ifdef INET6
57 #include <netinet6/ip6_ecn.h>
58 #endif
59
60 #include <netinet/ip6.h>
61 #ifdef INET6
62 #include <netinet6/ip6_var.h>
63 #endif
64 #include <netinet/in_pcb.h>
65 #ifdef INET6
66 #include <netinet/icmp6.h>
67 #endif
68
69 #include <netipsec/ipsec.h>
70 #ifdef INET6
71 #include <netipsec/ipsec6.h>
72 #endif
73 #include <netipsec/ah_var.h>
74 #include <netipsec/esp_var.h>
75 #include <netipsec/ipcomp_var.h>
76
77 #include <netipsec/xform.h>
78
79 #include <netipsec/key.h>
80 #include <netipsec/keydb.h>
81 #include <netipsec/key_debug.h>
82
83 #include <machine/in_cksum.h>
84
85 #ifdef IPSEC_NAT_T
86 #include <netinet/udp.h>
87 #endif
88
89 #ifdef DEV_ENC
90 #include <net/if_enc.h>
91 #endif
92
93
94 int
ipsec_process_done(struct mbuf * m,struct ipsecrequest * isr)95 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
96 {
97 struct tdb_ident *tdbi;
98 struct m_tag *mtag;
99 struct secasvar *sav;
100 struct secasindex *saidx;
101 int error;
102
103 IPSEC_ASSERT(m != NULL, ("null mbuf"));
104 IPSEC_ASSERT(isr != NULL, ("null ISR"));
105 sav = isr->sav;
106 IPSEC_ASSERT(sav != NULL, ("null SA"));
107 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
108
109 saidx = &sav->sah->saidx;
110 switch (saidx->dst.sa.sa_family) {
111 #ifdef INET
112 case AF_INET:
113 /* Fix the header length, for AH processing. */
114 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
115 break;
116 #endif /* INET */
117 #ifdef INET6
118 case AF_INET6:
119 /* Fix the header length, for AH processing. */
120 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
121 error = ENXIO;
122 goto bad;
123 }
124 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
125 /* No jumbogram support. */
126 error = ENXIO; /*?*/
127 goto bad;
128 }
129 mtod(m, struct ip6_hdr *)->ip6_plen =
130 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
131 break;
132 #endif /* INET6 */
133 default:
134 DPRINTF(("%s: unknown protocol family %u\n", __func__,
135 saidx->dst.sa.sa_family));
136 error = ENXIO;
137 goto bad;
138 }
139
140 /*
141 * Add a record of what we've done or what needs to be done to the
142 * packet.
143 */
144 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
145 sizeof(struct tdb_ident), M_NOWAIT);
146 if (mtag == NULL) {
147 DPRINTF(("%s: could not get packet tag\n", __func__));
148 error = ENOMEM;
149 goto bad;
150 }
151
152 tdbi = (struct tdb_ident *)(mtag + 1);
153 tdbi->dst = saidx->dst;
154 tdbi->proto = saidx->proto;
155 tdbi->spi = sav->spi;
156 m_tag_prepend(m, mtag);
157
158 /*
159 * If there's another (bundled) SA to apply, do so.
160 * Note that this puts a burden on the kernel stack size.
161 * If this is a problem we'll need to introduce a queue
162 * to set the packet on so we can unwind the stack before
163 * doing further processing.
164 */
165 if (isr->next) {
166 /* XXX-BZ currently only support same AF bundles. */
167 switch (saidx->dst.sa.sa_family) {
168 #ifdef INET
169 case AF_INET:
170 IPSECSTAT_INC(ips_out_bundlesa);
171 return ipsec4_process_packet(m, isr->next, 0, 0);
172 /* NOTREACHED */
173 #endif
174 #ifdef notyet
175 #ifdef INET6
176 case AF_INET6:
177 /* XXX */
178 IPSEC6STAT_INC(ips_out_bundlesa);
179 return ipsec6_process_packet(m, isr->next);
180 /* NOTREACHED */
181 #endif /* INET6 */
182 #endif
183 default:
184 DPRINTF(("%s: unknown protocol family %u\n", __func__,
185 saidx->dst.sa.sa_family));
186 error = ENXIO;
187 goto bad;
188 }
189 }
190 key_sa_recordxfer(sav, m); /* record data transfer */
191
192 /*
193 * We're done with IPsec processing, transmit the packet using the
194 * appropriate network protocol (IP or IPv6). SPD lookup will be
195 * performed again there.
196 */
197 switch (saidx->dst.sa.sa_family) {
198 #ifdef INET
199 case AF_INET:
200 #ifdef IPSEC_NAT_T
201 /*
202 * If NAT-T is enabled, now that all IPsec processing is done
203 * insert UDP encapsulation header after IP header.
204 */
205 if (sav->natt_type) {
206 struct ip *ip = mtod(m, struct ip *);
207 const int hlen = (ip->ip_hl << 2);
208 int size, off;
209 struct mbuf *mi;
210 struct udphdr *udp;
211
212 size = sizeof(struct udphdr);
213 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
214 /*
215 * draft-ietf-ipsec-nat-t-ike-0[01].txt and
216 * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
217 * ignoring possible AH mode
218 * non-IKE marker + non-ESP marker
219 * from draft-ietf-ipsec-udp-encaps-00.txt.
220 */
221 size += sizeof(u_int64_t);
222 }
223 mi = m_makespace(m, hlen, size, &off);
224 if (mi == NULL) {
225 DPRINTF(("%s: m_makespace for udphdr failed\n",
226 __func__));
227 error = ENOBUFS;
228 goto bad;
229 }
230
231 udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
232 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
233 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
234 else
235 udp->uh_sport =
236 KEY_PORTFROMSADDR(&sav->sah->saidx.src);
237 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
238 udp->uh_sum = 0;
239 udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
240 ip->ip_len = htons(m->m_pkthdr.len);
241 ip->ip_p = IPPROTO_UDP;
242
243 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
244 *(u_int64_t *)(udp + 1) = 0;
245 }
246 #endif /* IPSEC_NAT_T */
247
248 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
249 #endif /* INET */
250 #ifdef INET6
251 case AF_INET6:
252 /*
253 * We don't need massage, IPv6 header fields are always in
254 * net endian.
255 */
256 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
257 #endif /* INET6 */
258 }
259 panic("ipsec_process_done");
260 bad:
261 m_freem(m);
262 return (error);
263 }
264
265 static struct ipsecrequest *
ipsec_nextisr(struct mbuf * m,struct ipsecrequest * isr,int af,struct secasindex * saidx,int * error)266 ipsec_nextisr(
267 struct mbuf *m,
268 struct ipsecrequest *isr,
269 int af,
270 struct secasindex *saidx,
271 int *error
272 )
273 {
274 #define IPSEC_OSTAT(name) do { \
275 if (isr->saidx.proto == IPPROTO_ESP) \
276 ESPSTAT_INC(esps_##name); \
277 else if (isr->saidx.proto == IPPROTO_AH)\
278 AHSTAT_INC(ahs_##name); \
279 else \
280 IPCOMPSTAT_INC(ipcomps_##name); \
281 } while (0)
282 struct secasvar *sav;
283
284 IPSECREQUEST_LOCK_ASSERT(isr);
285
286 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
287 ("invalid address family %u", af));
288 again:
289 /*
290 * Craft SA index to search for proper SA. Note that
291 * we only fillin unspecified SA peers for transport
292 * mode; for tunnel mode they must already be filled in.
293 */
294 *saidx = isr->saidx;
295 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
296 /* Fillin unspecified SA peers only for transport mode */
297 if (af == AF_INET) {
298 struct sockaddr_in *sin;
299 struct ip *ip = mtod(m, struct ip *);
300
301 if (saidx->src.sa.sa_len == 0) {
302 sin = &saidx->src.sin;
303 sin->sin_len = sizeof(*sin);
304 sin->sin_family = AF_INET;
305 sin->sin_port = IPSEC_PORT_ANY;
306 sin->sin_addr = ip->ip_src;
307 }
308 if (saidx->dst.sa.sa_len == 0) {
309 sin = &saidx->dst.sin;
310 sin->sin_len = sizeof(*sin);
311 sin->sin_family = AF_INET;
312 sin->sin_port = IPSEC_PORT_ANY;
313 sin->sin_addr = ip->ip_dst;
314 }
315 } else {
316 struct sockaddr_in6 *sin6;
317 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
318
319 if (saidx->src.sin6.sin6_len == 0) {
320 sin6 = (struct sockaddr_in6 *)&saidx->src;
321 sin6->sin6_len = sizeof(*sin6);
322 sin6->sin6_family = AF_INET6;
323 sin6->sin6_port = IPSEC_PORT_ANY;
324 sin6->sin6_addr = ip6->ip6_src;
325 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
326 /* fix scope id for comparing SPD */
327 sin6->sin6_addr.s6_addr16[1] = 0;
328 sin6->sin6_scope_id =
329 ntohs(ip6->ip6_src.s6_addr16[1]);
330 }
331 }
332 if (saidx->dst.sin6.sin6_len == 0) {
333 sin6 = (struct sockaddr_in6 *)&saidx->dst;
334 sin6->sin6_len = sizeof(*sin6);
335 sin6->sin6_family = AF_INET6;
336 sin6->sin6_port = IPSEC_PORT_ANY;
337 sin6->sin6_addr = ip6->ip6_dst;
338 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
339 /* fix scope id for comparing SPD */
340 sin6->sin6_addr.s6_addr16[1] = 0;
341 sin6->sin6_scope_id =
342 ntohs(ip6->ip6_dst.s6_addr16[1]);
343 }
344 }
345 }
346 }
347
348 /*
349 * Lookup SA and validate it.
350 */
351 *error = key_checkrequest(isr, saidx);
352 if (*error != 0) {
353 /*
354 * IPsec processing is required, but no SA found.
355 * I assume that key_acquire() had been called
356 * to get/establish the SA. Here I discard
357 * this packet because it is responsibility for
358 * upper layer to retransmit the packet.
359 */
360 switch(af) {
361 case AF_INET:
362 IPSECSTAT_INC(ips_out_nosa);
363 break;
364 #ifdef INET6
365 case AF_INET6:
366 IPSEC6STAT_INC(ips_out_nosa);
367 break;
368 #endif
369 }
370 goto bad;
371 }
372 sav = isr->sav;
373 if (sav == NULL) {
374 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
375 ("no SA found, but required; level %u",
376 ipsec_get_reqlevel(isr)));
377 IPSECREQUEST_UNLOCK(isr);
378 isr = isr->next;
379 /*
380 * If isr is NULL, we found a 'use' policy w/o SA.
381 * Return w/o error and w/o isr so we can drop out
382 * and continue w/o IPsec processing.
383 */
384 if (isr == NULL)
385 return isr;
386 IPSECREQUEST_LOCK(isr);
387 goto again;
388 }
389
390 /*
391 * Check system global policy controls.
392 */
393 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
394 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
395 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
396 DPRINTF(("%s: IPsec outbound packet dropped due"
397 " to policy (check your sysctls)\n", __func__));
398 IPSEC_OSTAT(pdrops);
399 *error = EHOSTUNREACH;
400 goto bad;
401 }
402
403 /*
404 * Sanity check the SA contents for the caller
405 * before they invoke the xform output method.
406 */
407 if (sav->tdb_xform == NULL) {
408 DPRINTF(("%s: no transform for SA\n", __func__));
409 IPSEC_OSTAT(noxform);
410 *error = EHOSTUNREACH;
411 goto bad;
412 }
413 return isr;
414 bad:
415 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
416 IPSECREQUEST_UNLOCK(isr);
417 return NULL;
418 #undef IPSEC_OSTAT
419 }
420
421 #ifdef INET
422 /*
423 * IPsec output logic for IPv4.
424 */
425 int
ipsec4_process_packet(struct mbuf * m,struct ipsecrequest * isr,int flags,int tunalready)426 ipsec4_process_packet(
427 struct mbuf *m,
428 struct ipsecrequest *isr,
429 int flags,
430 int tunalready)
431 {
432 struct secasindex saidx;
433 struct secasvar *sav;
434 struct ip *ip;
435 int error, i, off;
436
437 IPSEC_ASSERT(m != NULL, ("null mbuf"));
438 IPSEC_ASSERT(isr != NULL, ("null isr"));
439
440 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
441
442 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
443 if (isr == NULL) {
444 if (error != 0)
445 goto bad;
446 return EJUSTRETURN;
447 }
448
449 sav = isr->sav;
450
451 #ifdef DEV_ENC
452 encif->if_opackets++;
453 encif->if_obytes += m->m_pkthdr.len;
454
455 /* pass the mbuf to enc0 for bpf processing */
456 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
457 /* pass the mbuf to enc0 for packet filtering */
458 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
459 goto bad;
460 #endif
461
462 if (!tunalready) {
463 union sockaddr_union *dst = &sav->sah->saidx.dst;
464 int setdf;
465
466 /*
467 * Collect IP_DF state from the outer header.
468 */
469 if (dst->sa.sa_family == AF_INET) {
470 if (m->m_len < sizeof (struct ip) &&
471 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
472 error = ENOBUFS;
473 goto bad;
474 }
475 ip = mtod(m, struct ip *);
476 /* Honor system-wide control of how to handle IP_DF */
477 switch (V_ip4_ipsec_dfbit) {
478 case 0: /* clear in outer header */
479 case 1: /* set in outer header */
480 setdf = V_ip4_ipsec_dfbit;
481 break;
482 default: /* propagate to outer header */
483 setdf = ntohs(ip->ip_off & IP_DF);
484 break;
485 }
486 } else {
487 ip = NULL; /* keep compiler happy */
488 setdf = 0;
489 }
490 /* Do the appropriate encapsulation, if necessary */
491 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
492 dst->sa.sa_family != AF_INET || /* PF mismatch */
493 #if 0
494 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
495 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
496 #endif
497 (dst->sa.sa_family == AF_INET && /* Proxy */
498 dst->sin.sin_addr.s_addr != INADDR_ANY &&
499 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
500 struct mbuf *mp;
501
502 /* Fix IPv4 header checksum and length */
503 if (m->m_len < sizeof (struct ip) &&
504 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
505 error = ENOBUFS;
506 goto bad;
507 }
508 ip = mtod(m, struct ip *);
509 if (ip->ip_v == IPVERSION) {
510 ip->ip_len = htons(m->m_pkthdr.len);
511 ip->ip_sum = 0;
512 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
513 }
514
515 /* Encapsulate the packet */
516 error = ipip_output(m, isr, &mp, 0, 0);
517 if (mp == NULL && !error) {
518 /* Should never happen. */
519 DPRINTF(("%s: ipip_output returns no mbuf and "
520 "no error!", __func__));
521 error = EFAULT;
522 }
523 if (error) {
524 if (mp) {
525 /* XXX: Should never happen! */
526 m_freem(mp);
527 }
528 m = NULL; /* ipip_output() already freed it */
529 goto bad;
530 }
531 m = mp, mp = NULL;
532 /*
533 * ipip_output clears IP_DF in the new header. If
534 * we need to propagate IP_DF from the outer header,
535 * then we have to do it here.
536 *
537 * XXX shouldn't assume what ipip_output does.
538 */
539 if (dst->sa.sa_family == AF_INET && setdf) {
540 if (m->m_len < sizeof (struct ip) &&
541 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
542 error = ENOBUFS;
543 goto bad;
544 }
545 ip = mtod(m, struct ip *);
546 ip->ip_off = ntohs(ip->ip_off);
547 ip->ip_off |= IP_DF;
548 ip->ip_off = htons(ip->ip_off);
549 }
550 }
551 }
552
553 #ifdef DEV_ENC
554 /* pass the mbuf to enc0 for bpf processing */
555 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER);
556 /* pass the mbuf to enc0 for packet filtering */
557 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
558 goto bad;
559 #endif
560
561 /*
562 * Dispatch to the appropriate IPsec transform logic. The
563 * packet will be returned for transmission after crypto
564 * processing, etc. are completed. For encapsulation we
565 * bypass this call because of the explicit call done above
566 * (necessary to deal with IP_DF handling for IPv4).
567 *
568 * NB: m & sav are ``passed to caller'' who's reponsible for
569 * for reclaiming their resources.
570 */
571 if (sav->tdb_xform->xf_type != XF_IP4) {
572 union sockaddr_union *dst = &sav->sah->saidx.dst;
573 switch(dst->sa.sa_family) {
574 case AF_INET:
575 ip = mtod(m, struct ip *);
576 i = ip->ip_hl << 2;
577 off = offsetof(struct ip, ip_p);
578 break;
579 #ifdef INET6
580 case AF_INET6:
581 i = sizeof(struct ip6_hdr);
582 off = offsetof(struct ip6_hdr, ip6_nxt);
583 break;
584 #endif /* INET6 */
585 default:
586 DPRINTF(("%s: unsupported protocol family %u\n",
587 __func__, dst->sa.sa_family));
588 error = EPFNOSUPPORT;
589 IPSECSTAT_INC(ips_out_inval);
590 goto bad;
591 }
592 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
593 } else {
594 error = ipsec_process_done(m, isr);
595 }
596 IPSECREQUEST_UNLOCK(isr);
597 return error;
598 bad:
599 if (isr)
600 IPSECREQUEST_UNLOCK(isr);
601 if (m)
602 m_freem(m);
603 return error;
604 }
605 #endif
606
607
608 #ifdef INET6
609 static int
in6_sa_equal_addrwithscope(const struct sockaddr_in6 * sa,const struct in6_addr * ia)610 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
611 {
612 struct in6_addr ia2;
613
614 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
615 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
616 ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
617
618 return IN6_ARE_ADDR_EQUAL(ia, &ia2);
619 }
620
621 /*
622 * IPsec output logic for IPv6.
623 */
624 int
ipsec6_process_packet(struct mbuf * m,struct ipsecrequest * isr)625 ipsec6_process_packet(
626 struct mbuf *m,
627 struct ipsecrequest *isr
628 )
629 {
630 struct secasindex saidx;
631 struct secasvar *sav;
632 struct ip6_hdr *ip6;
633 int error, i, off;
634 union sockaddr_union *dst;
635
636 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
637 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
638
639 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
640
641 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
642 if (isr == NULL) {
643 if (error != 0)
644 goto bad;
645 return EJUSTRETURN;
646 }
647
648 sav = isr->sav;
649 dst = &sav->sah->saidx.dst;
650
651 ip6 = mtod(m, struct ip6_hdr *);
652 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
653 #ifdef DEV_ENC
654 encif->if_opackets++;
655 encif->if_obytes += m->m_pkthdr.len;
656
657 /* pass the mbuf to enc0 for bpf processing */
658 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
659 /* pass the mbuf to enc0 for packet filtering */
660 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
661 goto bad;
662 #endif /* DEV_ENC */
663
664 /* Do the appropriate encapsulation, if necessary */
665 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
666 dst->sa.sa_family != AF_INET6 || /* PF mismatch */
667 ((dst->sa.sa_family == AF_INET6) &&
668 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
669 (!in6_sa_equal_addrwithscope(&dst->sin6,
670 &ip6->ip6_dst)))) {
671 struct mbuf *mp;
672
673 /* Fix IPv6 header payload length. */
674 if (m->m_len < sizeof(struct ip6_hdr))
675 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) {
676 error = ENOBUFS;
677 goto bad;
678 }
679
680 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
681 /* No jumbogram support. */
682 error = ENXIO; /*XXX*/
683 goto bad;
684 }
685
686 /* Encapsulate the packet */
687 error = ipip_output(m, isr, &mp, 0, 0);
688 if (mp == NULL && !error) {
689 /* Should never happen. */
690 DPRINTF(("ipsec6_process_packet: ipip_output "
691 "returns no mbuf and no error!"));
692 error = EFAULT;
693 goto bad;
694 }
695
696 if (error) {
697 if (mp) {
698 /* XXX: Should never happen! */
699 m_freem(mp);
700 }
701 m = NULL; /* ipip_output() already freed it */
702 goto bad;
703 }
704
705 m = mp;
706 mp = NULL;
707 }
708
709 #ifdef DEV_ENC
710 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER);
711 /* pass the mbuf to enc0 for packet filtering */
712 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
713 goto bad;
714 #endif /* DEV_ENC */
715
716 switch(dst->sa.sa_family) {
717 #ifdef INET
718 case AF_INET:
719 {
720 struct ip *ip;
721 ip = mtod(m, struct ip *);
722 i = ip->ip_hl << 2;
723 off = offsetof(struct ip, ip_p);
724 }
725 break;
726 #endif /* AF_INET */
727 case AF_INET6:
728 i = sizeof(struct ip6_hdr);
729 off = offsetof(struct ip6_hdr, ip6_nxt);
730 break;
731 default:
732 DPRINTF(("%s: unsupported protocol family %u\n",
733 __func__, dst->sa.sa_family));
734 error = EPFNOSUPPORT;
735 IPSEC6STAT_INC(ips_out_inval);
736 goto bad;
737 }
738 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
739 IPSECREQUEST_UNLOCK(isr);
740 return error;
741 bad:
742
743 if (isr)
744 IPSECREQUEST_UNLOCK(isr);
745 if (m)
746 m_freem(m);
747 return error;
748 }
749 #endif /*INET6*/
750