1 /* $FreeBSD: releng/7.4/sys/netipsec/xform_ipip.c 189984 2009-03-18 20:18:23Z bz $ */
2 /* $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */
3 /*-
4 * The authors of this code are John Ioannidis (ji@tla.org),
5 * Angelos D. Keromytis (kermit@csd.uch.gr) and
6 * Niels Provos (provos@physnet.uni-hamburg.de).
7 *
8 * The original version of this code was written by John Ioannidis
9 * for BSD/OS in Athens, Greece, in November 1995.
10 *
11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
12 * by Angelos D. Keromytis.
13 *
14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
15 * and Niels Provos.
16 *
17 * Additional features in 1999 by Angelos D. Keromytis.
18 *
19 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
20 * Angelos D. Keromytis and Niels Provos.
21 * Copyright (c) 2001, Angelos D. Keromytis.
22 *
23 * Permission to use, copy, and modify this software with or without fee
24 * is hereby granted, provided that this entire notice is included in
25 * all copies of any software which is or includes a copy or
26 * modification of this software.
27 * You may use this code under the GNU public license if you so wish. Please
28 * contribute changes back to the authors under this freer than GPL license
29 * so that we may further the use of strong encryption without limitations to
30 * all.
31 *
32 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
33 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
34 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
35 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
36 * PURPOSE.
37 */
38
39 /*
40 * IP-inside-IP processing
41 */
42 #include "opt_inet.h"
43 #include "opt_inet6.h"
44 #include "opt_enc.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50 #include <sys/kernel.h>
51 #include <sys/protosw.h>
52 #include <sys/sysctl.h>
53
54 #include <net/if.h>
55 #include <net/pfil.h>
56 #include <net/route.h>
57 #include <net/netisr.h>
58
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/in_var.h>
62 #include <netinet/ip.h>
63 #include <netinet/ip_ecn.h>
64 #include <netinet/ip_var.h>
65 #include <netinet/ip_encap.h>
66
67 #include <netipsec/ipsec.h>
68 #include <netipsec/xform.h>
69
70 #include <netipsec/ipip_var.h>
71
72 #ifdef MROUTING
73 #include <netinet/ip_mroute.h>
74 #endif
75
76 #ifdef INET6
77 #include <netinet/ip6.h>
78 #include <netipsec/ipsec6.h>
79 #include <netinet6/ip6_ecn.h>
80 #include <netinet6/in6_var.h>
81 #include <netinet6/ip6protosw.h>
82 #endif
83
84 #include <netipsec/key.h>
85 #include <netipsec/key_debug.h>
86
87 #include <machine/stdarg.h>
88
89 /*
90 * We can control the acceptance of IP4 packets by altering the sysctl
91 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance.
92 */
93 int ipip_allow = 0;
94 struct ipipstat ipipstat;
95
96 SYSCTL_DECL(_net_inet_ipip);
97 SYSCTL_INT(_net_inet_ipip, OID_AUTO,
98 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, "");
99 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
100 stats, CTLFLAG_RD, &ipipstat, ipipstat, "");
101
102 /* XXX IPCOMP */
103 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
104
105 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
106
107 #ifdef INET6
108 /*
109 * Really only a wrapper for ipip_input(), for use with IPv6.
110 */
111 int
112 ip4_input6(struct mbuf **m, int *offp, int proto)
113 {
114 #if 0
115 /* If we do not accept IP-in-IP explicitly, drop. */
116 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
117 DPRINTF(("%s: dropped due to policy\n", __func__));
118 ipipstat.ipips_pdrops++;
119 m_freem(*m);
120 return IPPROTO_DONE;
121 }
122 #endif
123 _ipip_input(*m, *offp, NULL);
124 return IPPROTO_DONE;
125 }
126 #endif /* INET6 */
127
128 #ifdef INET
129 /*
130 * Really only a wrapper for ipip_input(), for use with IPv4.
131 */
132 void
133 ip4_input(struct mbuf *m, int off)
134 {
135 #if 0
136 /* If we do not accept IP-in-IP explicitly, drop. */
137 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
138 DPRINTF(("%s: dropped due to policy\n", __func__));
139 ipipstat.ipips_pdrops++;
140 m_freem(m);
141 return;
142 }
143 #endif
144 _ipip_input(m, off, NULL);
145 }
146 #endif /* INET */
147
148 /*
149 * ipip_input gets called when we receive an IP{46} encapsulated packet,
150 * either because we got it at a real interface, or because AH or ESP
151 * were being used in tunnel mode (in which case the rcvif element will
152 * contain the address of the encX interface associated with the tunnel.
153 */
154
155 static void
156 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
157 {
158 register struct sockaddr_in *sin;
159 register struct ifnet *ifp;
160 register struct ifaddr *ifa;
161 struct ip *ipo;
162 #ifdef INET6
163 register struct sockaddr_in6 *sin6;
164 struct ip6_hdr *ip6 = NULL;
165 u_int8_t itos;
166 #endif
167 u_int8_t nxt;
168 int isr;
169 u_int8_t otos;
170 u_int8_t v;
171 int hlen;
172
173 ipipstat.ipips_ipackets++;
174
175 m_copydata(m, 0, 1, &v);
176
177 switch (v >> 4) {
178 #ifdef INET
179 case 4:
180 hlen = sizeof(struct ip);
181 break;
182 #endif /* INET */
183 #ifdef INET6
184 case 6:
185 hlen = sizeof(struct ip6_hdr);
186 break;
187 #endif
188 default:
189 ipipstat.ipips_family++;
190 m_freem(m);
191 return /* EAFNOSUPPORT */;
192 }
193
194 /* Bring the IP header in the first mbuf, if not there already */
195 if (m->m_len < hlen) {
196 if ((m = m_pullup(m, hlen)) == NULL) {
197 DPRINTF(("%s: m_pullup (1) failed\n", __func__));
198 ipipstat.ipips_hdrops++;
199 return;
200 }
201 }
202
203 ipo = mtod(m, struct ip *);
204
205 #ifdef MROUTING
206 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
207 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
208 ipip_mroute_input (m, iphlen);
209 return;
210 }
211 }
212 #endif /* MROUTING */
213
214 /* Keep outer ecn field. */
215 switch (v >> 4) {
216 #ifdef INET
217 case 4:
218 otos = ipo->ip_tos;
219 break;
220 #endif /* INET */
221 #ifdef INET6
222 case 6:
223 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
224 break;
225 #endif
226 default:
227 panic("ipip_input: unknown ip version %u (outer)", v>>4);
228 }
229
230 /* Remove outer IP header */
231 m_adj(m, iphlen);
232
233 /* Sanity check */
234 if (m->m_pkthdr.len < sizeof(struct ip)) {
235 ipipstat.ipips_hdrops++;
236 m_freem(m);
237 return;
238 }
239
240 m_copydata(m, 0, 1, &v);
241
242 switch (v >> 4) {
243 #ifdef INET
244 case 4:
245 hlen = sizeof(struct ip);
246 break;
247 #endif /* INET */
248
249 #ifdef INET6
250 case 6:
251 hlen = sizeof(struct ip6_hdr);
252 break;
253 #endif
254 default:
255 ipipstat.ipips_family++;
256 m_freem(m);
257 return; /* EAFNOSUPPORT */
258 }
259
260 /*
261 * Bring the inner IP header in the first mbuf, if not there already.
262 */
263 if (m->m_len < hlen) {
264 if ((m = m_pullup(m, hlen)) == NULL) {
265 DPRINTF(("%s: m_pullup (2) failed\n", __func__));
266 ipipstat.ipips_hdrops++;
267 return;
268 }
269 }
270
271 /*
272 * RFC 1853 specifies that the inner TTL should not be touched on
273 * decapsulation. There's no reason this comment should be here, but
274 * this is as good as any a position.
275 */
276
277 /* Some sanity checks in the inner IP header */
278 switch (v >> 4) {
279 #ifdef INET
280 case 4:
281 ipo = mtod(m, struct ip *);
282 nxt = ipo->ip_p;
283 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
284 break;
285 #endif /* INET */
286 #ifdef INET6
287 case 6:
288 ip6 = (struct ip6_hdr *) ipo;
289 nxt = ip6->ip6_nxt;
290 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
291 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
292 ip6->ip6_flow &= ~htonl(0xff << 20);
293 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
294 break;
295 #endif
296 default:
297 panic("ipip_input: unknown ip version %u (inner)", v>>4);
298 }
299
300 /* Check for local address spoofing. */
301 if ((m->m_pkthdr.rcvif == NULL ||
302 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
303 ipip_allow != 2) {
304 IFNET_RLOCK();
305 TAILQ_FOREACH(ifp, &ifnet, if_link) {
306 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
307 #ifdef INET
308 if (ipo) {
309 if (ifa->ifa_addr->sa_family !=
310 AF_INET)
311 continue;
312
313 sin = (struct sockaddr_in *) ifa->ifa_addr;
314
315 if (sin->sin_addr.s_addr ==
316 ipo->ip_src.s_addr) {
317 ipipstat.ipips_spoof++;
318 m_freem(m);
319 IFNET_RUNLOCK();
320 return;
321 }
322 }
323 #endif /* INET */
324
325 #ifdef INET6
326 if (ip6) {
327 if (ifa->ifa_addr->sa_family !=
328 AF_INET6)
329 continue;
330
331 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
332
333 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
334 ipipstat.ipips_spoof++;
335 m_freem(m);
336 IFNET_RUNLOCK();
337 return;
338 }
339
340 }
341 #endif /* INET6 */
342 }
343 }
344 IFNET_RUNLOCK();
345 }
346
347 /* Statistics */
348 ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
349
350 #ifdef DEV_ENC
351 switch (v >> 4) {
352 #ifdef INET
353 case 4:
354 ipsec_bpf(m, NULL, AF_INET, ENC_IN|ENC_AFTER);
355 break;
356 #endif
357 #ifdef INET6
358 case 6:
359 ipsec_bpf(m, NULL, AF_INET6, ENC_IN|ENC_AFTER);
360 break;
361 #endif
362 default:
363 panic("%s: bogus ip version %u", __func__, v>>4);
364 }
365 /* pass the mbuf to enc0 for packet filtering */
366 if (ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER) != 0)
367 return;
368 #endif
369
370 /*
371 * Interface pointer stays the same; if no IPsec processing has
372 * been done (or will be done), this will point to a normal
373 * interface. Otherwise, it'll point to an enc interface, which
374 * will allow a packet filter to distinguish between secure and
375 * untrusted packets.
376 */
377
378 switch (v >> 4) {
379 #ifdef INET
380 case 4:
381 isr = NETISR_IP;
382 break;
383 #endif
384 #ifdef INET6
385 case 6:
386 isr = NETISR_IPV6;
387 break;
388 #endif
389 default:
390 panic("%s: bogus ip version %u", __func__, v>>4);
391 }
392
393 if (netisr_queue(isr, m)) { /* (0) on success. */
394 ipipstat.ipips_qfull++;
395 DPRINTF(("%s: packet dropped because of full queue\n",
396 __func__));
397 }
398 }
399
400 int
401 ipip_output(
402 struct mbuf *m,
403 struct ipsecrequest *isr,
404 struct mbuf **mp,
405 int skip,
406 int protoff
407 )
408 {
409 struct secasvar *sav;
410 u_int8_t tp, otos;
411 struct secasindex *saidx;
412 int error;
413 #ifdef INET
414 u_int8_t itos;
415 struct ip *ipo;
416 #endif /* INET */
417 #ifdef INET6
418 struct ip6_hdr *ip6, *ip6o;
419 #endif /* INET6 */
420
421 IPSEC_SPLASSERT_SOFTNET(__func__);
422
423 sav = isr->sav;
424 IPSEC_ASSERT(sav != NULL, ("null SA"));
425 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
426
427 /* XXX Deal with empty TDB source/destination addresses. */
428
429 m_copydata(m, 0, 1, &tp);
430 tp = (tp >> 4) & 0xff; /* Get the IP version number. */
431
432 saidx = &sav->sah->saidx;
433 switch (saidx->dst.sa.sa_family) {
434 #ifdef INET
435 case AF_INET:
436 if (saidx->src.sa.sa_family != AF_INET ||
437 saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
438 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
439 DPRINTF(("%s: unspecified tunnel endpoint "
440 "address in SA %s/%08lx\n", __func__,
441 ipsec_address(&saidx->dst),
442 (u_long) ntohl(sav->spi)));
443 ipipstat.ipips_unspec++;
444 error = EINVAL;
445 goto bad;
446 }
447
448 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
449 if (m == 0) {
450 DPRINTF(("%s: M_PREPEND failed\n", __func__));
451 ipipstat.ipips_hdrops++;
452 error = ENOBUFS;
453 goto bad;
454 }
455
456 ipo = mtod(m, struct ip *);
457
458 ipo->ip_v = IPVERSION;
459 ipo->ip_hl = 5;
460 ipo->ip_len = htons(m->m_pkthdr.len);
461 ipo->ip_ttl = ip_defttl;
462 ipo->ip_sum = 0;
463 ipo->ip_src = saidx->src.sin.sin_addr;
464 ipo->ip_dst = saidx->dst.sin.sin_addr;
465
466 ipo->ip_id = ip_newid();
467
468 /* If the inner protocol is IP... */
469 if (tp == IPVERSION) {
470 /* Save ECN notification */
471 m_copydata(m, sizeof(struct ip) +
472 offsetof(struct ip, ip_tos),
473 sizeof(u_int8_t), (caddr_t) &itos);
474
475 ipo->ip_p = IPPROTO_IPIP;
476
477 /*
478 * We should be keeping tunnel soft-state and
479 * send back ICMPs if needed.
480 */
481 m_copydata(m, sizeof(struct ip) +
482 offsetof(struct ip, ip_off),
483 sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
484 ipo->ip_off = ntohs(ipo->ip_off);
485 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
486 ipo->ip_off = htons(ipo->ip_off);
487 }
488 #ifdef INET6
489 else if (tp == (IPV6_VERSION >> 4)) {
490 u_int32_t itos32;
491
492 /* Save ECN notification. */
493 m_copydata(m, sizeof(struct ip) +
494 offsetof(struct ip6_hdr, ip6_flow),
495 sizeof(u_int32_t), (caddr_t) &itos32);
496 itos = ntohl(itos32) >> 20;
497 ipo->ip_p = IPPROTO_IPV6;
498 ipo->ip_off = 0;
499 }
500 #endif /* INET6 */
501 else {
502 goto nofamily;
503 }
504
505 otos = 0;
506 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
507 ipo->ip_tos = otos;
508 break;
509 #endif /* INET */
510
511 #ifdef INET6
512 case AF_INET6:
513 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
514 saidx->src.sa.sa_family != AF_INET6 ||
515 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
516 DPRINTF(("%s: unspecified tunnel endpoint "
517 "address in SA %s/%08lx\n", __func__,
518 ipsec_address(&saidx->dst),
519 (u_long) ntohl(sav->spi)));
520 ipipstat.ipips_unspec++;
521 error = ENOBUFS;
522 goto bad;
523 }
524
525 /* scoped address handling */
526 ip6 = mtod(m, struct ip6_hdr *);
527 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
528 ip6->ip6_src.s6_addr16[1] = 0;
529 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
530 ip6->ip6_dst.s6_addr16[1] = 0;
531
532 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
533 if (m == 0) {
534 DPRINTF(("%s: M_PREPEND failed\n", __func__));
535 ipipstat.ipips_hdrops++;
536 error = ENOBUFS;
537 goto bad;
538 }
539
540 /* Initialize IPv6 header */
541 ip6o = mtod(m, struct ip6_hdr *);
542 ip6o->ip6_flow = 0;
543 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
544 ip6o->ip6_vfc |= IPV6_VERSION;
545 ip6o->ip6_plen = htons(m->m_pkthdr.len);
546 ip6o->ip6_hlim = ip_defttl;
547 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
548 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
549
550 #ifdef INET
551 if (tp == IPVERSION) {
552 /* Save ECN notification */
553 m_copydata(m, sizeof(struct ip6_hdr) +
554 offsetof(struct ip, ip_tos), sizeof(u_int8_t),
555 (caddr_t) &itos);
556
557 /* This is really IPVERSION. */
558 ip6o->ip6_nxt = IPPROTO_IPIP;
559 } else
560 #endif /* INET */
561 if (tp == (IPV6_VERSION >> 4)) {
562 u_int32_t itos32;
563
564 /* Save ECN notification. */
565 m_copydata(m, sizeof(struct ip6_hdr) +
566 offsetof(struct ip6_hdr, ip6_flow),
567 sizeof(u_int32_t), (caddr_t) &itos32);
568 itos = ntohl(itos32) >> 20;
569
570 ip6o->ip6_nxt = IPPROTO_IPV6;
571 } else {
572 goto nofamily;
573 }
574
575 otos = 0;
576 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
577 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
578 break;
579 #endif /* INET6 */
580
581 default:
582 nofamily:
583 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
584 saidx->dst.sa.sa_family));
585 ipipstat.ipips_family++;
586 error = EAFNOSUPPORT; /* XXX diffs from openbsd */
587 goto bad;
588 }
589
590 ipipstat.ipips_opackets++;
591 *mp = m;
592
593 #ifdef INET
594 if (saidx->dst.sa.sa_family == AF_INET) {
595 #if 0
596 if (sav->tdb_xform->xf_type == XF_IP4)
597 tdb->tdb_cur_bytes +=
598 m->m_pkthdr.len - sizeof(struct ip);
599 #endif
600 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
601 }
602 #endif /* INET */
603
604 #ifdef INET6
605 if (saidx->dst.sa.sa_family == AF_INET6) {
606 #if 0
607 if (sav->tdb_xform->xf_type == XF_IP4)
608 tdb->tdb_cur_bytes +=
609 m->m_pkthdr.len - sizeof(struct ip6_hdr);
610 #endif
611 ipipstat.ipips_obytes +=
612 m->m_pkthdr.len - sizeof(struct ip6_hdr);
613 }
614 #endif /* INET6 */
615
616 return 0;
617 bad:
618 if (m)
619 m_freem(m);
620 *mp = NULL;
621 return (error);
622 }
623
624 #ifdef IPSEC
625 static int
626 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
627 {
628 sav->tdb_xform = xsp;
629 return 0;
630 }
631
632 static int
633 ipe4_zeroize(struct secasvar *sav)
634 {
635 sav->tdb_xform = NULL;
636 return 0;
637 }
638
639 static int
640 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
641 {
642 /* This is a rather serious mistake, so no conditional printing. */
643 printf("%s: should never be called\n", __func__);
644 if (m)
645 m_freem(m);
646 return EOPNOTSUPP;
647 }
648
649 static struct xformsw ipe4_xformsw = {
650 XF_IP4, 0, "IPv4 Simple Encapsulation",
651 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output,
652 };
653
654 extern struct domain inetdomain;
655 static struct protosw ipe4_protosw = {
656 .pr_type = SOCK_RAW,
657 .pr_domain = &inetdomain,
658 .pr_protocol = IPPROTO_IPV4,
659 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
660 .pr_input = ip4_input,
661 .pr_ctloutput = rip_ctloutput,
662 .pr_usrreqs = &rip_usrreqs
663 };
664 #ifdef INET6
665 static struct ip6protosw ipe6_protosw = {
666 .pr_type = SOCK_RAW,
667 .pr_domain = &inetdomain,
668 .pr_protocol = IPPROTO_IPV6,
669 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
670 .pr_input = ip4_input6,
671 .pr_ctloutput = rip_ctloutput,
672 .pr_usrreqs = &rip_usrreqs
673 };
674 #endif
675
676 /*
677 * Check the encapsulated packet to see if we want it
678 */
679 static int
680 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
681 {
682 /*
683 * Only take packets coming from IPSEC tunnels; the rest
684 * must be handled by the gif tunnel code. Note that we
685 * also return a minimum priority when we want the packet
686 * so any explicit gif tunnels take precedence.
687 */
688 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
689 }
690
691 static void
692 ipe4_attach(void)
693 {
694 xform_register(&ipe4_xformsw);
695 /* attach to encapsulation framework */
696 /* XXX save return cookie for detach on module remove */
697 (void) encap_attach_func(AF_INET, -1,
698 ipe4_encapcheck, &ipe4_protosw, NULL);
699 #ifdef INET6
700 (void) encap_attach_func(AF_INET6, -1,
701 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
702 #endif
703 }
704 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
705 #endif /* IPSEC */
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