2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
5 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 /* IP payload compression protocol (IPComp), see RFC 2393 */
33 #include "opt_inet6.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
39 #include <sys/mutex.h>
40 #include <sys/socket.h>
41 #include <sys/kernel.h>
42 #include <sys/protosw.h>
43 #include <sys/sysctl.h>
45 #include <netinet/in.h>
46 #include <netinet/in_systm.h>
47 #include <netinet/ip.h>
48 #include <netinet/ip_var.h>
49 #include <netinet/ip_encap.h>
51 #include <net/netisr.h>
54 #include <netipsec/ipsec.h>
55 #include <netipsec/xform.h>
58 #include <netinet/ip6.h>
59 #include <netinet6/ip6_var.h>
60 #include <netipsec/ipsec6.h>
63 #include <netipsec/ipcomp.h>
64 #include <netipsec/ipcomp_var.h>
66 #include <netipsec/key.h>
67 #include <netipsec/key_debug.h>
69 #include <opencrypto/cryptodev.h>
70 #include <opencrypto/deflate.h>
71 #include <opencrypto/xform.h>
73 VNET_DEFINE(int, ipcomp_enable) = 1;
74 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
75 VNET_PCPUSTAT_SYSINIT(ipcompstat);
78 VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
81 SYSCTL_DECL(_net_inet_ipcomp);
82 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
83 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
84 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
85 struct ipcompstat, ipcompstat,
86 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
88 static int ipcomp_input_cb(struct cryptop *crp);
89 static int ipcomp_output_cb(struct cryptop *crp);
92 * RFC 3173 p 2.2. Non-Expansion Policy:
93 * If the total size of a compressed payload and the IPComp header, as
94 * defined in section 3, is not smaller than the size of the original
95 * payload, the IP datagram MUST be sent in the original non-compressed
98 * When we use IPComp in tunnel mode, for small packets we will receive
99 * encapsulated IP-IP datagrams without any compression and without IPComp
103 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
105 struct secasvar *sav;
107 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
112 if (src->sa.sa_family == AF_INET)
113 return (sizeof(struct in_addr) << 4);
115 return (sizeof(struct in6_addr) << 4);
119 ipcomp_nonexp_input(struct mbuf **mp, int *offp, int proto)
135 IPCOMPSTAT_INC(ipcomps_nopf);
137 return (IPPROTO_DONE);
140 IPCOMPSTAT_ADD(ipcomps_ibytes, (*mp)->m_pkthdr.len);
141 IPCOMPSTAT_INC(ipcomps_input);
142 netisr_dispatch(isr, *mp);
143 return (IPPROTO_DONE);
147 * ipcomp_init() is called when an CPI is being set up.
150 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
152 const struct comp_algo *tcomp;
153 struct cryptoini cric;
155 /* NB: algorithm really comes in alg_enc and not alg_comp! */
156 tcomp = comp_algorithm_lookup(sav->alg_enc);
158 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
162 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
163 sav->tdb_xform = xsp;
164 sav->tdb_compalgxform = tcomp;
166 /* Initialize crypto session */
167 bzero(&cric, sizeof (cric));
168 cric.cri_alg = sav->tdb_compalgxform->type;
170 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
174 * ipcomp_zeroize() used when IPCA is deleted
177 ipcomp_zeroize(struct secasvar *sav)
181 err = crypto_freesession(sav->tdb_cryptoid);
182 sav->tdb_cryptoid = 0;
187 * ipcomp_input() gets called to uncompress an input packet
190 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
192 struct xform_data *xd;
193 struct cryptodesc *crdc;
195 struct ipcomp *ipcomp;
197 int error, hlen = IPCOMP_HLENGTH;
200 * Check that the next header of the IPComp is not IPComp again, before
201 * doing any real work. Given it is not possible to do double
202 * compression it means someone is playing tricks on us.
205 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
206 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
207 DPRINTF(("%s: m_pullup failed\n", __func__));
211 addr = (caddr_t) mtod(m, struct ip *) + skip;
212 ipcomp = (struct ipcomp *)addr;
213 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
214 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
215 DPRINTF(("%s: recursive compression detected\n", __func__));
220 /* Get crypto descriptors */
221 crp = crypto_getreq(1);
223 DPRINTF(("%s: no crypto descriptors\n", __func__));
224 IPCOMPSTAT_INC(ipcomps_crypto);
227 /* Get IPsec-specific opaque pointer */
228 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO);
230 DPRINTF(("%s: cannot allocate xform_data\n", __func__));
231 IPCOMPSTAT_INC(ipcomps_crypto);
235 crdc = crp->crp_desc;
237 crdc->crd_skip = skip + hlen;
238 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
239 crdc->crd_inject = skip;
241 /* Decompression operation */
242 crdc->crd_alg = sav->tdb_compalgxform->type;
245 /* Crypto operation descriptor */
246 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
247 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
248 crp->crp_buf = (caddr_t) m;
249 crp->crp_callback = ipcomp_input_cb;
250 crp->crp_opaque = (caddr_t) xd;
252 /* These are passed as-is to the callback */
254 xd->protoff = protoff;
258 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
259 SECASVAR_UNLOCK(sav);
261 return crypto_dispatch(crp);
269 * IPComp input callback from the crypto driver.
272 ipcomp_input_cb(struct cryptop *crp)
274 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
275 struct cryptodesc *crd;
276 struct xform_data *xd;
278 struct secasvar *sav;
279 struct secasindex *saidx;
282 int hlen = IPCOMP_HLENGTH, error, clen;
288 m = (struct mbuf *) crp->crp_buf;
289 xd = (struct xform_data *) crp->crp_opaque;
292 protoff = xd->protoff;
293 cryptoid = xd->cryptoid;
294 saidx = &sav->sah->saidx;
295 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
296 saidx->dst.sa.sa_family == AF_INET6,
297 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
299 /* Check for crypto errors */
300 if (crp->crp_etype) {
301 if (crp->crp_etype == EAGAIN) {
302 /* Reset the session ID */
303 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
304 crypto_freesession(cryptoid);
305 xd->cryptoid = crp->crp_sid;
306 return (crypto_dispatch(crp));
308 IPCOMPSTAT_INC(ipcomps_noxform);
309 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
310 error = crp->crp_etype;
313 /* Shouldn't happen... */
315 IPCOMPSTAT_INC(ipcomps_crypto);
316 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
320 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
322 clen = crp->crp_olen; /* Length of data after processing */
324 /* Release the crypto descriptors */
325 free(xd, M_XDATA), xd = NULL;
326 crypto_freereq(crp), crp = NULL;
328 /* In case it's not done already, adjust the size of the mbuf chain */
329 m->m_pkthdr.len = clen + hlen + skip;
331 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
332 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
333 DPRINTF(("%s: m_pullup failed\n", __func__));
334 error = EINVAL; /*XXX*/
338 /* Keep the next protocol field */
339 addr = (caddr_t) mtod(m, struct ip *) + skip;
340 nproto = ((struct ipcomp *) addr)->comp_nxt;
342 /* Remove the IPCOMP header */
343 error = m_striphdr(m, skip, hlen);
345 IPCOMPSTAT_INC(ipcomps_hdrops);
346 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
347 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
348 (u_long) ntohl(sav->spi)));
352 /* Restore the Next Protocol field */
353 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
355 switch (saidx->dst.sa.sa_family) {
358 error = ipsec6_common_input_cb(m, sav, skip, protoff);
363 error = ipsec4_common_input_cb(m, sav, skip, protoff);
367 panic("%s: Unexpected address family: %d saidx=%p", __func__,
368 saidx->dst.sa.sa_family, saidx);
384 * IPComp output routine, called by ipsec[46]_perform_request()
387 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
388 u_int idx, int skip, int protoff)
390 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
391 const struct comp_algo *ipcompx;
392 struct cryptodesc *crdc;
394 struct xform_data *xd;
395 int error, ralen, maxpacketsize;
397 IPSEC_ASSERT(sav != NULL, ("null SA"));
398 ipcompx = sav->tdb_compalgxform;
399 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
402 * Do not touch the packet in case our payload to compress
403 * is lower than the minimal threshold of the compression
404 * alogrithm. We will just send out the data uncompressed.
405 * See RFC 3173, 2.2. Non-Expansion Policy.
407 if (m->m_pkthdr.len <= ipcompx->minlen) {
408 IPCOMPSTAT_INC(ipcomps_threshold);
409 return ipsec_process_done(m, sp, sav, idx);
412 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
413 IPCOMPSTAT_INC(ipcomps_output);
415 /* Check for maximum packet size violations. */
416 switch (sav->sah->saidx.dst.sa.sa_family) {
419 maxpacketsize = IP_MAXPACKET;
424 maxpacketsize = IPV6_MAXPACKET;
428 IPCOMPSTAT_INC(ipcomps_nopf);
429 DPRINTF(("%s: unknown/unsupported protocol family %d, "
430 "IPCA %s/%08lx\n", __func__,
431 sav->sah->saidx.dst.sa.sa_family,
432 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
433 (u_long) ntohl(sav->spi)));
434 error = EPFNOSUPPORT;
437 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
438 IPCOMPSTAT_INC(ipcomps_toobig);
439 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
440 "(len %u, max len %u)\n", __func__,
441 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
442 (u_long) ntohl(sav->spi),
443 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
448 /* Update the counters */
449 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
451 m = m_unshare(m, M_NOWAIT);
453 IPCOMPSTAT_INC(ipcomps_hdrops);
454 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
455 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
456 sizeof(buf)), (u_long) ntohl(sav->spi)));
461 /* Ok now, we can pass to the crypto processing. */
463 /* Get crypto descriptors */
464 crp = crypto_getreq(1);
466 IPCOMPSTAT_INC(ipcomps_crypto);
467 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
471 crdc = crp->crp_desc;
473 /* Compression descriptor */
474 crdc->crd_skip = skip;
475 crdc->crd_len = ralen;
476 crdc->crd_flags = CRD_F_COMP;
477 crdc->crd_inject = skip;
479 /* Compression operation */
480 crdc->crd_alg = ipcompx->type;
482 /* IPsec-specific opaque crypto info */
483 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO);
485 IPCOMPSTAT_INC(ipcomps_crypto);
486 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
496 xd->protoff = protoff;
498 /* Crypto operation descriptor */
499 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
500 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
501 crp->crp_buf = (caddr_t) m;
502 crp->crp_callback = ipcomp_output_cb;
503 crp->crp_opaque = (caddr_t) xd;
506 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
507 SECASVAR_UNLOCK(sav);
509 return crypto_dispatch(crp);
519 * IPComp output callback from the crypto driver.
522 ipcomp_output_cb(struct cryptop *crp)
524 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
525 struct xform_data *xd;
526 struct secpolicy *sp;
527 struct secasvar *sav;
531 int error, skip, protoff;
533 m = (struct mbuf *) crp->crp_buf;
534 xd = (struct xform_data *) crp->crp_opaque;
539 protoff = xd->protoff;
540 cryptoid = xd->cryptoid;
542 /* Check for crypto errors */
543 if (crp->crp_etype) {
544 if (crp->crp_etype == EAGAIN) {
545 /* Reset the session ID */
546 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
547 crypto_freesession(cryptoid);
548 xd->cryptoid = crp->crp_sid;
549 return (crypto_dispatch(crp));
551 IPCOMPSTAT_INC(ipcomps_noxform);
552 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
553 error = crp->crp_etype;
556 /* Shouldn't happen... */
558 IPCOMPSTAT_INC(ipcomps_crypto);
559 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
563 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
565 if (crp->crp_ilen - skip > crp->crp_olen) {
567 struct ipcomp *ipcomp;
571 /* Compression helped, inject IPCOMP header. */
572 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
574 IPCOMPSTAT_INC(ipcomps_wrap);
575 DPRINTF(("%s: IPCOMP header inject failed "
576 "for IPCA %s/%08lx\n",
577 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
578 sizeof(buf)), (u_long) ntohl(sav->spi)));
582 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
584 /* Initialize the IPCOMP header */
585 /* XXX alignment always correct? */
586 switch (sav->sah->saidx.dst.sa.sa_family) {
589 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
594 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
598 ipcomp->comp_flags = 0;
599 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
601 /* Fix Next Protocol in IPv4/IPv6 header */
602 prot = IPPROTO_IPCOMP;
603 m_copyback(m, protoff, sizeof(u_int8_t),
606 /* Adjust the length in the IP header */
607 switch (sav->sah->saidx.dst.sa.sa_family) {
610 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
615 mtod(m, struct ip6_hdr *)->ip6_plen =
616 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
620 IPCOMPSTAT_INC(ipcomps_nopf);
621 DPRINTF(("%s: unknown/unsupported protocol "
622 "family %d, IPCA %s/%08lx\n", __func__,
623 sav->sah->saidx.dst.sa.sa_family,
624 ipsec_address(&sav->sah->saidx.dst, buf,
625 sizeof(buf)), (u_long) ntohl(sav->spi)));
626 error = EPFNOSUPPORT;
630 /* Compression was useless, we have lost time. */
631 IPCOMPSTAT_INC(ipcomps_uncompr);
632 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
633 __func__, crp->crp_ilen, skip, crp->crp_olen));
634 /* XXX remember state to not compress the next couple
635 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
638 /* Release the crypto descriptor */
642 /* NB: m is reclaimed by ipsec_process_done. */
643 error = ipsec_process_done(m, sp, sav, idx);
656 static const struct encaptab *ipe4_cookie = NULL;
657 extern struct domain inetdomain;
658 static struct protosw ipcomp4_protosw = {
660 .pr_domain = &inetdomain,
661 .pr_protocol = 0 /* IPPROTO_IPV[46] */,
662 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR,
663 .pr_input = ipcomp_nonexp_input,
664 .pr_output = rip_output,
665 .pr_ctloutput = rip_ctloutput,
666 .pr_usrreqs = &rip_usrreqs
670 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
673 union sockaddr_union src, dst;
676 if (V_ipcomp_enable == 0)
678 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
680 bzero(&src, sizeof(src));
681 bzero(&dst, sizeof(dst));
682 src.sa.sa_family = dst.sa.sa_family = AF_INET;
683 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
684 ip = mtod(m, const struct ip *);
685 src.sin.sin_addr = ip->ip_src;
686 dst.sin.sin_addr = ip->ip_dst;
687 return (ipcomp_encapcheck(&src, &dst));
691 static const struct encaptab *ipe6_cookie = NULL;
692 extern struct domain inet6domain;
693 static struct protosw ipcomp6_protosw = {
695 .pr_domain = &inet6domain,
696 .pr_protocol = 0 /* IPPROTO_IPV[46] */,
697 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR,
698 .pr_input = ipcomp_nonexp_input,
699 .pr_output = rip6_output,
700 .pr_ctloutput = rip6_ctloutput,
701 .pr_usrreqs = &rip6_usrreqs
705 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
708 union sockaddr_union src, dst;
709 const struct ip6_hdr *ip6;
711 if (V_ipcomp_enable == 0)
713 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
715 bzero(&src, sizeof(src));
716 bzero(&dst, sizeof(dst));
717 src.sa.sa_family = dst.sa.sa_family = AF_INET;
718 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
719 ip6 = mtod(m, const struct ip6_hdr *);
720 src.sin6.sin6_addr = ip6->ip6_src;
721 dst.sin6.sin6_addr = ip6->ip6_dst;
722 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
723 /* XXX: sa6_recoverscope() */
724 src.sin6.sin6_scope_id =
725 ntohs(src.sin6.sin6_addr.s6_addr16[1]);
726 src.sin6.sin6_addr.s6_addr16[1] = 0;
728 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
729 /* XXX: sa6_recoverscope() */
730 dst.sin6.sin6_scope_id =
731 ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
732 dst.sin6.sin6_addr.s6_addr16[1] = 0;
734 return (ipcomp_encapcheck(&src, &dst));
738 static struct xformsw ipcomp_xformsw = {
739 .xf_type = XF_IPCOMP,
741 .xf_init = ipcomp_init,
742 .xf_zeroize = ipcomp_zeroize,
743 .xf_input = ipcomp_input,
744 .xf_output = ipcomp_output,
752 ipe4_cookie = encap_attach_func(AF_INET, -1,
753 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL);
756 ipe6_cookie = encap_attach_func(AF_INET6, -1,
757 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL);
759 xform_attach(&ipcomp_xformsw);
767 encap_detach(ipe4_cookie);
770 encap_detach(ipe6_cookie);
772 xform_detach(&ipcomp_xformsw);
775 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
776 ipcomp_attach, NULL);
777 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
778 ipcomp_detach, NULL);