Change mbug allocation flags from M_ to MB_ to avoid confusion with malloc
[dragonfly.git] / sys / netproto / ipsec / xform_ipip.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netipsec/xform_ipip.c,v 1.3.2.1 2003/01/24 05:11:36 sam Exp $ */
74f1caca 2/* $DragonFly: src/sys/netproto/ipsec/xform_ipip.c,v 1.7 2004/06/02 14:43:02 eirikn Exp $ */
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3/* $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */
4/*
5 * The authors of this code are John Ioannidis (ji@tla.org),
6 * Angelos D. Keromytis (kermit@csd.uch.gr) and
7 * Niels Provos (provos@physnet.uni-hamburg.de).
8 *
9 * The original version of this code was written by John Ioannidis
10 * for BSD/OS in Athens, Greece, in November 1995.
11 *
12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
13 * by Angelos D. Keromytis.
14 *
15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
16 * and Niels Provos.
17 *
18 * Additional features in 1999 by Angelos D. Keromytis.
19 *
20 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
21 * Angelos D. Keromytis and Niels Provos.
22 * Copyright (c) 2001, Angelos D. Keromytis.
23 *
24 * Permission to use, copy, and modify this software with or without fee
25 * is hereby granted, provided that this entire notice is included in
26 * all copies of any software which is or includes a copy or
27 * modification of this software.
28 * You may use this code under the GNU public license if you so wish. Please
29 * contribute changes back to the authors under this freer than GPL license
30 * so that we may further the use of strong encryption without limitations to
31 * all.
32 *
33 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
34 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
35 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
36 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
37 * PURPOSE.
38 */
39
40/*
41 * IP-inside-IP processing
42 */
43#include "opt_inet.h"
44#include "opt_inet6.h"
45#include "opt_random_ip_id.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/mbuf.h>
50#include <sys/socket.h>
51#include <sys/kernel.h>
52#include <sys/protosw.h>
53#include <sys/sysctl.h>
54
55#include <net/if.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#include <netinet/ipprotosw.h>
67
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68#include "ipsec.h"
69#include "xform.h"
984263bc 70
1f2de5d4 71#include "ipip_var.h"
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72
73#ifdef MROUTING
74#include <netinet/ip_mroute.h>
75#endif
76
77#ifdef INET6
78#include <netinet/ip6.h>
1f2de5d4 79#include "ipsec6.h"
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80#include <netinet6/ip6_ecn.h>
81#include <netinet6/in6_var.h>
82#include <netinet6/ip6protosw.h>
83#endif
84
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85#include "key.h"
86#include "key_debug.h"
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87
88#include <machine/stdarg.h>
89
90typedef void pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */
91
92/*
93 * We can control the acceptance of IP4 packets by altering the sysctl
94 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance.
95 */
96int ipip_allow = 0;
97struct ipipstat ipipstat;
98
99SYSCTL_DECL(_net_inet_ipip);
100SYSCTL_INT(_net_inet_ipip, OID_AUTO,
101 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, "");
102SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
103 stats, CTLFLAG_RD, &ipipstat, ipipstat, "");
104
105/* XXX IPCOMP */
106#define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
107
108static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
109
110#ifdef INET6
111/*
112 * Really only a wrapper for ipip_input(), for use with IPv6.
113 */
114int
115ip4_input6(struct mbuf **m, int *offp, int proto)
116{
117#if 0
118 /* If we do not accept IP-in-IP explicitly, drop. */
119 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
120 DPRINTF(("ip4_input6: dropped due to policy\n"));
121 ipipstat.ipips_pdrops++;
122 m_freem(*m);
123 return IPPROTO_DONE;
124 }
125#endif
126 _ipip_input(*m, *offp, NULL);
127 return IPPROTO_DONE;
128}
129#endif /* INET6 */
130
131#ifdef INET
132/*
133 * Really only a wrapper for ipip_input(), for use with IPv4.
134 */
135void
136ip4_input(struct mbuf *m, ...)
137{
e2565a42 138 __va_list ap;
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139 int iphlen;
140
141#if 0
142 /* If we do not accept IP-in-IP explicitly, drop. */
143 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
144 DPRINTF(("ip4_input: dropped due to policy\n"));
145 ipipstat.ipips_pdrops++;
146 m_freem(m);
147 return;
148 }
149#endif
e2565a42
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150 __va_start(ap, m);
151 iphlen = __va_arg(ap, int);
152 __va_end(ap);
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153
154 _ipip_input(m, iphlen, NULL);
155}
156#endif /* INET */
157
158/*
159 * ipip_input gets called when we receive an IP{46} encapsulated packet,
160 * either because we got it at a real interface, or because AH or ESP
161 * were being used in tunnel mode (in which case the rcvif element will
162 * contain the address of the encX interface associated with the tunnel.
163 */
164
165static void
166_ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
167{
34ee9825
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168 struct sockaddr_in *sin;
169 struct ifnet *ifp;
170 struct ifaddr *ifa;
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171 struct ifqueue *ifq = NULL;
172 struct ip *ipo;
173#ifdef INET6
34ee9825 174 struct sockaddr_in6 *sin6;
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175 struct ip6_hdr *ip6 = NULL;
176 u_int8_t itos;
177#endif
178 u_int8_t nxt;
179 int isr;
180 u_int8_t otos;
181 u_int8_t v;
182 int hlen;
183
184 ipipstat.ipips_ipackets++;
185
186 m_copydata(m, 0, 1, &v);
187
188 switch (v >> 4) {
189#ifdef INET
190 case 4:
191 hlen = sizeof(struct ip);
192 break;
193#endif /* INET */
194#ifdef INET6
195 case 6:
196 hlen = sizeof(struct ip6_hdr);
197 break;
198#endif
199 default:
200 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) "
201 "for outer header\n", v, v>>4));
202 ipipstat.ipips_family++;
203 m_freem(m);
204 return /* EAFNOSUPPORT */;
205 }
206
207 /* Bring the IP header in the first mbuf, if not there already */
208 if (m->m_len < hlen) {
209 if ((m = m_pullup(m, hlen)) == NULL) {
210 DPRINTF(("ipip_input: m_pullup (1) failed\n"));
211 ipipstat.ipips_hdrops++;
212 return;
213 }
214 }
215
216 ipo = mtod(m, struct ip *);
217
218#ifdef MROUTING
219 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
220 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
221 ipip_mroute_input (m, iphlen);
222 return;
223 }
224 }
225#endif /* MROUTING */
226
227 /* Keep outer ecn field. */
228 switch (v >> 4) {
229#ifdef INET
230 case 4:
231 otos = ipo->ip_tos;
232 break;
233#endif /* INET */
234#ifdef INET6
235 case 6:
236 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
237 break;
238#endif
239 default:
240 panic("ipip_input: unknown ip version %u (outer)", v>>4);
241 }
242
243 /* Remove outer IP header */
244 m_adj(m, iphlen);
245
246 /* Sanity check */
247 if (m->m_pkthdr.len < sizeof(struct ip)) {
248 ipipstat.ipips_hdrops++;
249 m_freem(m);
250 return;
251 }
252
253 m_copydata(m, 0, 1, &v);
254
255 switch (v >> 4) {
256#ifdef INET
257 case 4:
258 hlen = sizeof(struct ip);
259 break;
260#endif /* INET */
261
262#ifdef INET6
263 case 6:
264 hlen = sizeof(struct ip6_hdr);
265 break;
266#endif
267 default:
268 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) "
269 "for inner header\n", v, v>>4));
270 ipipstat.ipips_family++;
271 m_freem(m);
272 return; /* EAFNOSUPPORT */
273 }
274
275 /*
276 * Bring the inner IP header in the first mbuf, if not there already.
277 */
278 if (m->m_len < hlen) {
279 if ((m = m_pullup(m, hlen)) == NULL) {
280 DPRINTF(("ipip_input: m_pullup (2) failed\n"));
281 ipipstat.ipips_hdrops++;
282 return;
283 }
284 }
285
286 /*
287 * RFC 1853 specifies that the inner TTL should not be touched on
288 * decapsulation. There's no reason this comment should be here, but
289 * this is as good as any a position.
290 */
291
292 /* Some sanity checks in the inner IP header */
293 switch (v >> 4) {
294#ifdef INET
295 case 4:
296 ipo = mtod(m, struct ip *);
297 nxt = ipo->ip_p;
298 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
299 break;
300#endif /* INET */
301#ifdef INET6
302 case 6:
303 ip6 = (struct ip6_hdr *) ipo;
304 nxt = ip6->ip6_nxt;
305 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
306 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
307 ip6->ip6_flow &= ~htonl(0xff << 20);
308 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
309 break;
310#endif
311 default:
312 panic("ipip_input: unknown ip version %u (inner)", v>>4);
313 }
314
315 /* Check for local address spoofing. */
316 if ((m->m_pkthdr.rcvif == NULL ||
317 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
318 ipip_allow != 2) {
319 for (ifp = ifnet.tqh_first; ifp != 0;
320 ifp = ifp->if_list.tqe_next) {
321 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
322 ifa = ifa->ifa_list.tqe_next) {
323#ifdef INET
324 if (ipo) {
325 if (ifa->ifa_addr->sa_family !=
326 AF_INET)
327 continue;
328
329 sin = (struct sockaddr_in *) ifa->ifa_addr;
330
331 if (sin->sin_addr.s_addr ==
332 ipo->ip_src.s_addr) {
333 ipipstat.ipips_spoof++;
334 m_freem(m);
335 return;
336 }
337 }
338#endif /* INET */
339
340#ifdef INET6
341 if (ip6) {
342 if (ifa->ifa_addr->sa_family !=
343 AF_INET6)
344 continue;
345
346 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
347
348 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
349 ipipstat.ipips_spoof++;
350 m_freem(m);
351 return;
352 }
353
354 }
355#endif /* INET6 */
356 }
357 }
358 }
359
360 /* Statistics */
361 ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
362
363 /*
364 * Interface pointer stays the same; if no IPsec processing has
365 * been done (or will be done), this will point to a normal
366 * interface. Otherwise, it'll point to an enc interface, which
367 * will allow a packet filter to distinguish between secure and
368 * untrusted packets.
369 */
370
371 switch (v >> 4) {
372#ifdef INET
373 case 4:
374 ifq = &ipintrq;
375 isr = NETISR_IP;
376 break;
377#endif
378#ifdef INET6
379 case 6:
380 ifq = &ip6intrq;
381 isr = NETISR_IPV6;
382 break;
383#endif
384 default:
385 panic("ipip_input: should never reach here");
386 }
387
388 if (!IF_HANDOFF(ifq, m, NULL)) {
389 ipipstat.ipips_qfull++;
390
391 DPRINTF(("ipip_input: packet dropped because of full queue\n"));
392 } else {
393 schednetisr(isr);
394 }
395}
396
397int
398ipip_output(
399 struct mbuf *m,
400 struct ipsecrequest *isr,
401 struct mbuf **mp,
402 int skip,
403 int protoff
404)
405{
406 struct secasvar *sav;
407 u_int8_t tp, otos;
408 struct secasindex *saidx;
409 int error;
410#ifdef INET
411 u_int8_t itos;
412 struct ip *ipo;
413#endif /* INET */
414#ifdef INET6
415 struct ip6_hdr *ip6, *ip6o;
416#endif /* INET6 */
417
418 SPLASSERT(net, "ipip_output");
419
420 sav = isr->sav;
421 KASSERT(sav != NULL, ("ipip_output: null SA"));
422 KASSERT(sav->sah != NULL, ("ipip_output: null SAH"));
423
424 /* XXX Deal with empty TDB source/destination addresses. */
425
426 m_copydata(m, 0, 1, &tp);
427 tp = (tp >> 4) & 0xff; /* Get the IP version number. */
428
429 saidx = &sav->sah->saidx;
430 switch (saidx->dst.sa.sa_family) {
431#ifdef INET
432 case AF_INET:
433 if (saidx->src.sa.sa_family != AF_INET ||
434 saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
435 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
436 DPRINTF(("ipip_output: unspecified tunnel endpoint "
437 "address in SA %s/%08lx\n",
438 ipsec_address(&saidx->dst),
439 (u_long) ntohl(sav->spi)));
440 ipipstat.ipips_unspec++;
441 error = EINVAL;
442 goto bad;
443 }
444
74f1caca 445 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
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446 if (m == 0) {
447 DPRINTF(("ipip_output: M_PREPEND failed\n"));
448 ipipstat.ipips_hdrops++;
449 error = ENOBUFS;
450 goto bad;
451 }
452
453 ipo = mtod(m, struct ip *);
454
455 ipo->ip_v = IPVERSION;
456 ipo->ip_hl = 5;
457 ipo->ip_len = htons(m->m_pkthdr.len);
458 ipo->ip_ttl = ip_defttl;
459 ipo->ip_sum = 0;
460 ipo->ip_src = saidx->src.sin.sin_addr;
461 ipo->ip_dst = saidx->dst.sin.sin_addr;
462
463#ifdef RANDOM_IP_ID
464 ipo->ip_id = ip_randomid();
465#else
466 ipo->ip_id = htons(ip_id++);
467#endif
468
469 /* If the inner protocol is IP... */
470 if (tp == IPVERSION) {
471 /* Save ECN notification */
472 m_copydata(m, sizeof(struct ip) +
473 offsetof(struct ip, ip_tos),
474 sizeof(u_int8_t), (caddr_t) &itos);
475
476 ipo->ip_p = IPPROTO_IPIP;
477
478 /*
479 * We should be keeping tunnel soft-state and
480 * send back ICMPs if needed.
481 */
482 m_copydata(m, sizeof(struct ip) +
483 offsetof(struct ip, ip_off),
484 sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
485 ipo->ip_off = ntohs(ipo->ip_off);
486 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
487 ipo->ip_off = htons(ipo->ip_off);
488 }
489#ifdef INET6
490 else if (tp == (IPV6_VERSION >> 4)) {
491 u_int32_t itos32;
492
493 /* Save ECN notification. */
494 m_copydata(m, sizeof(struct ip) +
495 offsetof(struct ip6_hdr, ip6_flow),
496 sizeof(u_int32_t), (caddr_t) &itos32);
497 itos = ntohl(itos32) >> 20;
498 ipo->ip_p = IPPROTO_IPV6;
499 ipo->ip_off = 0;
500 }
501#endif /* INET6 */
502 else {
503 goto nofamily;
504 }
505
506 otos = 0;
507 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
508 ipo->ip_tos = otos;
509 break;
510#endif /* INET */
511
512#ifdef INET6
513 case AF_INET6:
514 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
515 saidx->src.sa.sa_family != AF_INET6 ||
516 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
517 DPRINTF(("ipip_output: unspecified tunnel endpoint "
518 "address in SA %s/%08lx\n",
519 ipsec_address(&saidx->dst),
520 (u_long) ntohl(sav->spi)));
521 ipipstat.ipips_unspec++;
522 error = ENOBUFS;
523 goto bad;
524 }
525
526 /* scoped address handling */
527 ip6 = mtod(m, struct ip6_hdr *);
528 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
529 ip6->ip6_src.s6_addr16[1] = 0;
530 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
531 ip6->ip6_dst.s6_addr16[1] = 0;
532
74f1caca 533 M_PREPEND(m, sizeof(struct ip6_hdr), MB_DONTWAIT);
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534 if (m == 0) {
535 DPRINTF(("ipip_output: M_PREPEND failed\n"));
536 ipipstat.ipips_hdrops++;
537 *mp = NULL;
538 error = ENOBUFS;
539 goto bad;
540 }
541
542 /* Initialize IPv6 header */
543 ip6o = mtod(m, struct ip6_hdr *);
544 ip6o->ip6_flow = 0;
545 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
546 ip6o->ip6_vfc |= IPV6_VERSION;
547 ip6o->ip6_plen = htons(m->m_pkthdr.len);
548 ip6o->ip6_hlim = ip_defttl;
549 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
550 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
551
552#ifdef INET
553 if (tp == IPVERSION) {
554 /* Save ECN notification */
555 m_copydata(m, sizeof(struct ip6_hdr) +
556 offsetof(struct ip, ip_tos), sizeof(u_int8_t),
557 (caddr_t) &itos);
558
559 /* This is really IPVERSION. */
560 ip6o->ip6_nxt = IPPROTO_IPIP;
561 } else
562#endif /* INET */
563 if (tp == (IPV6_VERSION >> 4)) {
564 u_int32_t itos32;
565
566 /* Save ECN notification. */
567 m_copydata(m, sizeof(struct ip6_hdr) +
568 offsetof(struct ip6_hdr, ip6_flow),
569 sizeof(u_int32_t), (caddr_t) &itos32);
570 itos = ntohl(itos32) >> 20;
571
572 ip6o->ip6_nxt = IPPROTO_IPV6;
573 } else {
574 goto nofamily;
575 }
576
577 otos = 0;
578 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
579 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
580 break;
581#endif /* INET6 */
582
583 default:
584nofamily:
585 DPRINTF(("ipip_output: unsupported protocol family %u\n",
586 saidx->dst.sa.sa_family));
587 ipipstat.ipips_family++;
588 error = EAFNOSUPPORT; /* XXX diffs from openbsd */
589 goto bad;
590 }
591
592 ipipstat.ipips_opackets++;
593 *mp = m;
594
595#ifdef INET
596 if (saidx->dst.sa.sa_family == AF_INET) {
597#if 0
598 if (sav->tdb_xform->xf_type == XF_IP4)
599 tdb->tdb_cur_bytes +=
600 m->m_pkthdr.len - sizeof(struct ip);
601#endif
602 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
603 }
604#endif /* INET */
605
606#ifdef INET6
607 if (saidx->dst.sa.sa_family == AF_INET6) {
608#if 0
609 if (sav->tdb_xform->xf_type == XF_IP4)
610 tdb->tdb_cur_bytes +=
611 m->m_pkthdr.len - sizeof(struct ip6_hdr);
612#endif
613 ipipstat.ipips_obytes +=
614 m->m_pkthdr.len - sizeof(struct ip6_hdr);
615 }
616#endif /* INET6 */
617
618 return 0;
619bad:
620 if (m)
621 m_freem(m), *mp = NULL;
622 return (error);
623}
624
625#ifdef FAST_IPSEC
626static int
627ipe4_init(struct secasvar *sav, struct xformsw *xsp)
628{
629 sav->tdb_xform = xsp;
630 return 0;
631}
632
633static int
634ipe4_zeroize(struct secasvar *sav)
635{
636 sav->tdb_xform = NULL;
637 return 0;
638}
639
640static int
641ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
642{
643 /* This is a rather serious mistake, so no conditional printing. */
644 printf("ipe4_input: should never be called\n");
645 if (m)
646 m_freem(m);
647 return EOPNOTSUPP;
648}
649
650static struct xformsw ipe4_xformsw = {
651 XF_IP4, 0, "IPv4 Simple Encapsulation",
652 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output,
653};
654
655extern struct domain inetdomain;
656static struct ipprotosw ipe4_protosw[] = {
657{ SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
658 (pr_in_input_t*) ip4_input,
659 0, 0, rip_ctloutput,
9eeaa8a9 660 cpu0_soport,
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661 0, 0, 0, 0,
662 &rip_usrreqs
663},
664#ifdef INET6
665{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
666 (pr_in_input_t*) ip4_input,
667 0, 0, rip_ctloutput,
9eeaa8a9 668 cpu0_soport,
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669 0, 0, 0, 0,
670 &rip_usrreqs
671}
672#endif
673};
674
675/*
676 * Check the encapsulated packet to see if we want it
677 */
678static int
679ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
680{
681 /*
682 * Only take packets coming from IPSEC tunnels; the rest
683 * must be handled by the gif tunnel code. Note that we
684 * also return a minimum priority when we want the packet
685 * so any explicit gif tunnels take precedence.
686 */
687 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
688}
689
690static void
691ipe4_attach(void)
692{
693 xform_register(&ipe4_xformsw);
694 /* attach to encapsulation framework */
695 /* XXX save return cookie for detach on module remove */
696 (void) encap_attach_func(AF_INET, -1,
697 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL);
698#ifdef INET6
699 (void) encap_attach_func(AF_INET6, -1,
700 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL);
701#endif
702}
703SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
704#endif /* FAST_IPSEC */