2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
5 * SPDX-License-Identifier: BSD-3-Clause
7 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 /* IP payload compression protocol (IPComp), see RFC 2393 */
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
41 #include <sys/mutex.h>
42 #include <sys/socket.h>
43 #include <sys/kernel.h>
44 #include <sys/protosw.h>
45 #include <sys/sysctl.h>
47 #include <netinet/in.h>
48 #include <netinet/in_systm.h>
49 #include <netinet/ip.h>
50 #include <netinet/ip_var.h>
51 #include <netinet/ip_encap.h>
53 #include <net/netisr.h>
56 #include <netipsec/ipsec.h>
57 #include <netipsec/xform.h>
60 #include <netinet/ip6.h>
61 #include <netinet6/ip6_var.h>
62 #include <netipsec/ipsec6.h>
65 #include <netipsec/ipcomp.h>
66 #include <netipsec/ipcomp_var.h>
68 #include <netipsec/key.h>
69 #include <netipsec/key_debug.h>
71 #include <opencrypto/cryptodev.h>
72 #include <opencrypto/deflate.h>
73 #include <opencrypto/xform.h>
75 VNET_DEFINE(int, ipcomp_enable) = 1;
76 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
77 VNET_PCPUSTAT_SYSINIT(ipcompstat);
80 VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
83 SYSCTL_DECL(_net_inet_ipcomp);
84 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
85 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
86 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
87 struct ipcompstat, ipcompstat,
88 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
90 static int ipcomp_input_cb(struct cryptop *crp);
91 static int ipcomp_output_cb(struct cryptop *crp);
94 * RFC 3173 p 2.2. Non-Expansion Policy:
95 * If the total size of a compressed payload and the IPComp header, as
96 * defined in section 3, is not smaller than the size of the original
97 * payload, the IP datagram MUST be sent in the original non-compressed
100 * When we use IPComp in tunnel mode, for small packets we will receive
101 * encapsulated IP-IP datagrams without any compression and without IPComp
105 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
107 struct secasvar *sav;
109 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
114 if (src->sa.sa_family == AF_INET)
115 return (sizeof(struct in_addr) << 4);
117 return (sizeof(struct in6_addr) << 4);
121 ipcomp_nonexp_input(struct mbuf **mp, int *offp, int proto)
137 IPCOMPSTAT_INC(ipcomps_nopf);
139 return (IPPROTO_DONE);
142 IPCOMPSTAT_ADD(ipcomps_ibytes, (*mp)->m_pkthdr.len);
143 IPCOMPSTAT_INC(ipcomps_input);
144 netisr_dispatch(isr, *mp);
145 return (IPPROTO_DONE);
149 * ipcomp_init() is called when an CPI is being set up.
152 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
154 const struct comp_algo *tcomp;
155 struct cryptoini cric;
157 /* NB: algorithm really comes in alg_enc and not alg_comp! */
158 tcomp = comp_algorithm_lookup(sav->alg_enc);
160 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
164 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
165 sav->tdb_xform = xsp;
166 sav->tdb_compalgxform = tcomp;
168 /* Initialize crypto session */
169 bzero(&cric, sizeof (cric));
170 cric.cri_alg = sav->tdb_compalgxform->type;
172 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
176 * ipcomp_zeroize() used when IPCA is deleted
179 ipcomp_zeroize(struct secasvar *sav)
183 err = crypto_freesession(sav->tdb_cryptoid);
184 sav->tdb_cryptoid = 0;
189 * ipcomp_input() gets called to uncompress an input packet
192 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
194 struct xform_data *xd;
195 struct cryptodesc *crdc;
197 struct ipcomp *ipcomp;
199 int error, hlen = IPCOMP_HLENGTH;
202 * Check that the next header of the IPComp is not IPComp again, before
203 * doing any real work. Given it is not possible to do double
204 * compression it means someone is playing tricks on us.
207 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
208 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
209 DPRINTF(("%s: m_pullup failed\n", __func__));
213 addr = (caddr_t) mtod(m, struct ip *) + skip;
214 ipcomp = (struct ipcomp *)addr;
215 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
216 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
217 DPRINTF(("%s: recursive compression detected\n", __func__));
222 /* Get crypto descriptors */
223 crp = crypto_getreq(1);
225 DPRINTF(("%s: no crypto descriptors\n", __func__));
226 IPCOMPSTAT_INC(ipcomps_crypto);
229 /* Get IPsec-specific opaque pointer */
230 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO);
232 DPRINTF(("%s: cannot allocate xform_data\n", __func__));
233 IPCOMPSTAT_INC(ipcomps_crypto);
237 crdc = crp->crp_desc;
239 crdc->crd_skip = skip + hlen;
240 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
241 crdc->crd_inject = skip;
243 /* Decompression operation */
244 crdc->crd_alg = sav->tdb_compalgxform->type;
247 /* Crypto operation descriptor */
248 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
249 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
250 crp->crp_buf = (caddr_t) m;
251 crp->crp_callback = ipcomp_input_cb;
252 crp->crp_opaque = (caddr_t) xd;
254 /* These are passed as-is to the callback */
256 xd->protoff = protoff;
260 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
261 SECASVAR_UNLOCK(sav);
263 return crypto_dispatch(crp);
271 * IPComp input callback from the crypto driver.
274 ipcomp_input_cb(struct cryptop *crp)
276 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
277 struct xform_data *xd;
279 struct secasvar *sav;
280 struct secasindex *saidx;
283 int hlen = IPCOMP_HLENGTH, error, clen;
287 m = (struct mbuf *) crp->crp_buf;
288 xd = (struct xform_data *) crp->crp_opaque;
291 protoff = xd->protoff;
292 cryptoid = xd->cryptoid;
293 saidx = &sav->sah->saidx;
294 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
295 saidx->dst.sa.sa_family == AF_INET6,
296 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
298 /* Check for crypto errors */
299 if (crp->crp_etype) {
300 if (crp->crp_etype == EAGAIN) {
301 /* Reset the session ID */
302 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
303 crypto_freesession(cryptoid);
304 xd->cryptoid = crp->crp_sid;
305 return (crypto_dispatch(crp));
307 IPCOMPSTAT_INC(ipcomps_noxform);
308 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
309 error = crp->crp_etype;
312 /* Shouldn't happen... */
314 IPCOMPSTAT_INC(ipcomps_crypto);
315 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
319 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
321 clen = crp->crp_olen; /* Length of data after processing */
323 /* Release the crypto descriptors */
324 free(xd, M_XDATA), xd = NULL;
325 crypto_freereq(crp), crp = NULL;
327 /* In case it's not done already, adjust the size of the mbuf chain */
328 m->m_pkthdr.len = clen + hlen + skip;
330 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
331 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
332 DPRINTF(("%s: m_pullup failed\n", __func__));
333 error = EINVAL; /*XXX*/
337 /* Keep the next protocol field */
338 addr = (caddr_t) mtod(m, struct ip *) + skip;
339 nproto = ((struct ipcomp *) addr)->comp_nxt;
341 /* Remove the IPCOMP header */
342 error = m_striphdr(m, skip, hlen);
344 IPCOMPSTAT_INC(ipcomps_hdrops);
345 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
346 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
347 (u_long) ntohl(sav->spi)));
351 /* Restore the Next Protocol field */
352 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
354 switch (saidx->dst.sa.sa_family) {
357 error = ipsec6_common_input_cb(m, sav, skip, protoff);
362 error = ipsec4_common_input_cb(m, sav, skip, protoff);
366 panic("%s: Unexpected address family: %d saidx=%p", __func__,
367 saidx->dst.sa.sa_family, saidx);
383 * IPComp output routine, called by ipsec[46]_perform_request()
386 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
387 u_int idx, int skip, int protoff)
389 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
390 const struct comp_algo *ipcompx;
391 struct cryptodesc *crdc;
393 struct xform_data *xd;
394 int error, ralen, maxpacketsize;
396 IPSEC_ASSERT(sav != NULL, ("null SA"));
397 ipcompx = sav->tdb_compalgxform;
398 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
401 * Do not touch the packet in case our payload to compress
402 * is lower than the minimal threshold of the compression
403 * alogrithm. We will just send out the data uncompressed.
404 * See RFC 3173, 2.2. Non-Expansion Policy.
406 if (m->m_pkthdr.len <= ipcompx->minlen) {
407 IPCOMPSTAT_INC(ipcomps_threshold);
408 return ipsec_process_done(m, sp, sav, idx);
411 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
412 IPCOMPSTAT_INC(ipcomps_output);
414 /* Check for maximum packet size violations. */
415 switch (sav->sah->saidx.dst.sa.sa_family) {
418 maxpacketsize = IP_MAXPACKET;
423 maxpacketsize = IPV6_MAXPACKET;
427 IPCOMPSTAT_INC(ipcomps_nopf);
428 DPRINTF(("%s: unknown/unsupported protocol family %d, "
429 "IPCA %s/%08lx\n", __func__,
430 sav->sah->saidx.dst.sa.sa_family,
431 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
432 (u_long) ntohl(sav->spi)));
433 error = EPFNOSUPPORT;
436 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
437 IPCOMPSTAT_INC(ipcomps_toobig);
438 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
439 "(len %u, max len %u)\n", __func__,
440 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
441 (u_long) ntohl(sav->spi),
442 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
447 /* Update the counters */
448 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
450 m = m_unshare(m, M_NOWAIT);
452 IPCOMPSTAT_INC(ipcomps_hdrops);
453 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
454 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
455 sizeof(buf)), (u_long) ntohl(sav->spi)));
460 /* Ok now, we can pass to the crypto processing. */
462 /* Get crypto descriptors */
463 crp = crypto_getreq(1);
465 IPCOMPSTAT_INC(ipcomps_crypto);
466 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
470 crdc = crp->crp_desc;
472 /* Compression descriptor */
473 crdc->crd_skip = skip;
474 crdc->crd_len = ralen;
475 crdc->crd_flags = CRD_F_COMP;
476 crdc->crd_inject = skip;
478 /* Compression operation */
479 crdc->crd_alg = ipcompx->type;
481 /* IPsec-specific opaque crypto info */
482 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO);
484 IPCOMPSTAT_INC(ipcomps_crypto);
485 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
495 xd->protoff = protoff;
497 /* Crypto operation descriptor */
498 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
499 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
500 crp->crp_buf = (caddr_t) m;
501 crp->crp_callback = ipcomp_output_cb;
502 crp->crp_opaque = (caddr_t) xd;
505 crp->crp_sid = xd->cryptoid = sav->tdb_cryptoid;
506 SECASVAR_UNLOCK(sav);
508 return crypto_dispatch(crp);
518 * IPComp output callback from the crypto driver.
521 ipcomp_output_cb(struct cryptop *crp)
523 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
524 struct xform_data *xd;
525 struct secpolicy *sp;
526 struct secasvar *sav;
530 int error, skip, protoff;
532 m = (struct mbuf *) crp->crp_buf;
533 xd = (struct xform_data *) crp->crp_opaque;
538 protoff = xd->protoff;
539 cryptoid = xd->cryptoid;
541 /* Check for crypto errors */
542 if (crp->crp_etype) {
543 if (crp->crp_etype == EAGAIN) {
544 /* Reset the session ID */
545 if (ipsec_updateid(sav, &crp->crp_sid, &cryptoid) != 0)
546 crypto_freesession(cryptoid);
547 xd->cryptoid = crp->crp_sid;
548 return (crypto_dispatch(crp));
550 IPCOMPSTAT_INC(ipcomps_noxform);
551 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
552 error = crp->crp_etype;
555 /* Shouldn't happen... */
557 IPCOMPSTAT_INC(ipcomps_crypto);
558 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
562 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
564 if (crp->crp_ilen - skip > crp->crp_olen) {
566 struct ipcomp *ipcomp;
570 /* Compression helped, inject IPCOMP header. */
571 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
573 IPCOMPSTAT_INC(ipcomps_wrap);
574 DPRINTF(("%s: IPCOMP header inject failed "
575 "for IPCA %s/%08lx\n",
576 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
577 sizeof(buf)), (u_long) ntohl(sav->spi)));
581 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
583 /* Initialize the IPCOMP header */
584 /* XXX alignment always correct? */
585 switch (sav->sah->saidx.dst.sa.sa_family) {
588 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
593 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
597 ipcomp->comp_flags = 0;
598 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
600 /* Fix Next Protocol in IPv4/IPv6 header */
601 prot = IPPROTO_IPCOMP;
602 m_copyback(m, protoff, sizeof(u_int8_t),
605 /* Adjust the length in the IP header */
606 switch (sav->sah->saidx.dst.sa.sa_family) {
609 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
614 mtod(m, struct ip6_hdr *)->ip6_plen =
615 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
619 IPCOMPSTAT_INC(ipcomps_nopf);
620 DPRINTF(("%s: unknown/unsupported protocol "
621 "family %d, IPCA %s/%08lx\n", __func__,
622 sav->sah->saidx.dst.sa.sa_family,
623 ipsec_address(&sav->sah->saidx.dst, buf,
624 sizeof(buf)), (u_long) ntohl(sav->spi)));
625 error = EPFNOSUPPORT;
629 /* Compression was useless, we have lost time. */
630 IPCOMPSTAT_INC(ipcomps_uncompr);
631 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
632 __func__, crp->crp_ilen, skip, crp->crp_olen));
633 /* XXX remember state to not compress the next couple
634 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
637 /* Release the crypto descriptor */
641 /* NB: m is reclaimed by ipsec_process_done. */
642 error = ipsec_process_done(m, sp, sav, idx);
655 static const struct encaptab *ipe4_cookie = NULL;
656 extern struct domain inetdomain;
657 static struct protosw ipcomp4_protosw = {
659 .pr_domain = &inetdomain,
660 .pr_protocol = 0 /* IPPROTO_IPV[46] */,
661 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR,
662 .pr_input = ipcomp_nonexp_input,
663 .pr_output = rip_output,
664 .pr_ctloutput = rip_ctloutput,
665 .pr_usrreqs = &rip_usrreqs
669 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
672 union sockaddr_union src, dst;
675 if (V_ipcomp_enable == 0)
677 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
679 bzero(&src, sizeof(src));
680 bzero(&dst, sizeof(dst));
681 src.sa.sa_family = dst.sa.sa_family = AF_INET;
682 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
683 ip = mtod(m, const struct ip *);
684 src.sin.sin_addr = ip->ip_src;
685 dst.sin.sin_addr = ip->ip_dst;
686 return (ipcomp_encapcheck(&src, &dst));
690 static const struct encaptab *ipe6_cookie = NULL;
691 extern struct domain inet6domain;
692 static struct protosw ipcomp6_protosw = {
694 .pr_domain = &inet6domain,
695 .pr_protocol = 0 /* IPPROTO_IPV[46] */,
696 .pr_flags = PR_ATOMIC | PR_ADDR | PR_LASTHDR,
697 .pr_input = ipcomp_nonexp_input,
698 .pr_output = rip6_output,
699 .pr_ctloutput = rip6_ctloutput,
700 .pr_usrreqs = &rip6_usrreqs
704 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
707 union sockaddr_union src, dst;
708 const struct ip6_hdr *ip6;
710 if (V_ipcomp_enable == 0)
712 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
714 bzero(&src, sizeof(src));
715 bzero(&dst, sizeof(dst));
716 src.sa.sa_family = dst.sa.sa_family = AF_INET;
717 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
718 ip6 = mtod(m, const struct ip6_hdr *);
719 src.sin6.sin6_addr = ip6->ip6_src;
720 dst.sin6.sin6_addr = ip6->ip6_dst;
721 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
722 /* XXX: sa6_recoverscope() */
723 src.sin6.sin6_scope_id =
724 ntohs(src.sin6.sin6_addr.s6_addr16[1]);
725 src.sin6.sin6_addr.s6_addr16[1] = 0;
727 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
728 /* XXX: sa6_recoverscope() */
729 dst.sin6.sin6_scope_id =
730 ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
731 dst.sin6.sin6_addr.s6_addr16[1] = 0;
733 return (ipcomp_encapcheck(&src, &dst));
737 static struct xformsw ipcomp_xformsw = {
738 .xf_type = XF_IPCOMP,
740 .xf_init = ipcomp_init,
741 .xf_zeroize = ipcomp_zeroize,
742 .xf_input = ipcomp_input,
743 .xf_output = ipcomp_output,
751 ipe4_cookie = encap_attach_func(AF_INET, -1,
752 ipcomp4_nonexp_encapcheck, &ipcomp4_protosw, NULL);
755 ipe6_cookie = encap_attach_func(AF_INET6, -1,
756 ipcomp6_nonexp_encapcheck, &ipcomp6_protosw, NULL);
758 xform_attach(&ipcomp_xformsw);
766 encap_detach(ipe4_cookie);
769 encap_detach(ipe6_cookie);
771 xform_detach(&ipcomp_xformsw);
774 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
775 ipcomp_attach, NULL);
776 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
777 ipcomp_detach, NULL);