2/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
3
4/*-
5 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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.
18 *
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.
29 */
30
31/* IP payload compression protocol (IPComp), see RFC 2393 */
32#include "opt_inet.h"
33#include "opt_inet6.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/mbuf.h>
38#include <sys/lock.h>
39#include <sys/mutex.h>
40#include <sys/rwlock.h>
41#include <sys/socket.h>
42#include <sys/kernel.h>
43#include <sys/protosw.h>
44#include <sys/sysctl.h>
45
46#include <netinet/in.h>
47#include <netinet/in_systm.h>
48#include <netinet/ip.h>
49#include <netinet/ip_var.h>
50
51#include <net/route.h>
52#include <net/vnet.h>
53
54#include <netipsec/ipsec.h>
55#include <netipsec/xform.h>
56
57#ifdef INET6
58#include <netinet/ip6.h>
59#include <netipsec/ipsec6.h>
60#endif
61
62#include <netipsec/ipcomp.h>
63#include <netipsec/ipcomp_var.h>
64
65#include <netipsec/key.h>
66#include <netipsec/key_debug.h>
67
68#include <opencrypto/cryptodev.h>
69#include <opencrypto/deflate.h>
70#include <opencrypto/xform.h>
71
72VNET_DEFINE(int, ipcomp_enable) = 1;
73VNET_DEFINE(struct ipcompstat, ipcompstat);
74
75SYSCTL_DECL(_net_inet_ipcomp);
76SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO,
77 ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
78SYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
79 stats, CTLFLAG_RD, &VNET_NAME(ipcompstat), ipcompstat, "");
80
81static int ipcomp_input_cb(struct cryptop *crp);
82static int ipcomp_output_cb(struct cryptop *crp);
83
84struct comp_algo *
85ipcomp_algorithm_lookup(int alg)
86{
87 if (alg >= IPCOMP_ALG_MAX)
88 return NULL;
89 switch (alg) {
90 case SADB_X_CALG_DEFLATE:
91 return &comp_algo_deflate;
92 }
93 return NULL;
94}
95
96/*
97 * ipcomp_init() is called when an CPI is being set up.
98 */
99static int
100ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
101{
102 struct comp_algo *tcomp;
103 struct cryptoini cric;
104
105 /* NB: algorithm really comes in alg_enc and not alg_comp! */
106 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
107 if (tcomp == NULL) {
108 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
109 sav->alg_comp));
110 return EINVAL;
111 }
112 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
113 sav->tdb_xform = xsp;
114 sav->tdb_compalgxform = tcomp;
115
116 /* Initialize crypto session */
117 bzero(&cric, sizeof (cric));
118 cric.cri_alg = sav->tdb_compalgxform->type;
119
120 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
121}
122
123/*
124 * ipcomp_zeroize() used when IPCA is deleted
125 */
126static int
127ipcomp_zeroize(struct secasvar *sav)
128{
129 int err;
130
131 err = crypto_freesession(sav->tdb_cryptoid);
132 sav->tdb_cryptoid = 0;
133 return err;
134}
135
136/*
137 * ipcomp_input() gets called to uncompress an input packet
138 */
139static int
140ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
141{
142 struct tdb_crypto *tc;
143 struct cryptodesc *crdc;
144 struct cryptop *crp;
145 struct ipcomp *ipcomp;
146 caddr_t addr;
147 int hlen = IPCOMP_HLENGTH;
148
149 /*
150 * Check that the next header of the IPComp is not IPComp again, before
151 * doing any real work. Given it is not possible to do double
152 * compression it means someone is playing tricks on us.
153 */
154 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
155 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
156 DPRINTF(("%s: m_pullup failed\n", __func__));
157 return (ENOBUFS);
158 }
159 addr = (caddr_t) mtod(m, struct ip *) + skip;
160 ipcomp = (struct ipcomp *)addr;
161 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
162 m_freem(m);
163 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
164 DPRINTF(("%s: recursive compression detected\n", __func__));
165 return (EINVAL);
166 }
167
168 /* Get crypto descriptors */
169 crp = crypto_getreq(1);
170 if (crp == NULL) {
171 m_freem(m);
172 DPRINTF(("%s: no crypto descriptors\n", __func__));
173 IPCOMPSTAT_INC(ipcomps_crypto);
174 return ENOBUFS;
175 }
176 /* Get IPsec-specific opaque pointer */
177 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
178 if (tc == NULL) {
179 m_freem(m);
180 crypto_freereq(crp);
181 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
182 IPCOMPSTAT_INC(ipcomps_crypto);
183 return ENOBUFS;
184 }
185 crdc = crp->crp_desc;
186
187 crdc->crd_skip = skip + hlen;
188 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
189 crdc->crd_inject = skip;
190
191 tc->tc_ptr = 0;
192
193 /* Decompression operation */
194 crdc->crd_alg = sav->tdb_compalgxform->type;
195
196 /* Crypto operation descriptor */
197 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
198 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
199 crp->crp_buf = (caddr_t) m;
200 crp->crp_callback = ipcomp_input_cb;
201 crp->crp_sid = sav->tdb_cryptoid;
202 crp->crp_opaque = (caddr_t) tc;
203
204 /* These are passed as-is to the callback */
205 tc->tc_spi = sav->spi;
206 tc->tc_dst = sav->sah->saidx.dst;
207 tc->tc_proto = sav->sah->saidx.proto;
208 tc->tc_protoff = protoff;
209 tc->tc_skip = skip;
210 KEY_ADDREFSA(sav);
211 tc->tc_sav = sav;
212
213 return crypto_dispatch(crp);
214}
215
216/*
217 * IPComp input callback from the crypto driver.
218 */
219static int
220ipcomp_input_cb(struct cryptop *crp)
221{
222 struct cryptodesc *crd;
223 struct tdb_crypto *tc;
224 int skip, protoff;
225 struct mtag *mtag;
226 struct mbuf *m;
227 struct secasvar *sav;
228 struct secasindex *saidx;
229 int hlen = IPCOMP_HLENGTH, error, clen;
230 u_int8_t nproto;
231 caddr_t addr;
232
233 crd = crp->crp_desc;
234
235 tc = (struct tdb_crypto *) crp->crp_opaque;
236 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
237 skip = tc->tc_skip;
238 protoff = tc->tc_protoff;
239 mtag = (struct mtag *) tc->tc_ptr;
240 m = (struct mbuf *) crp->crp_buf;
241
242 sav = tc->tc_sav;
243 IPSEC_ASSERT(sav != NULL, ("null SA!"));
244
245 saidx = &sav->sah->saidx;
246 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
247 saidx->dst.sa.sa_family == AF_INET6,
248 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
249
250 /* Check for crypto errors */
251 if (crp->crp_etype) {
252 /* Reset the session ID */
253 if (sav->tdb_cryptoid != 0)
254 sav->tdb_cryptoid = crp->crp_sid;
255
256 if (crp->crp_etype == EAGAIN) {
257 return crypto_dispatch(crp);
258 }
259 IPCOMPSTAT_INC(ipcomps_noxform);
260 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
261 error = crp->crp_etype;
262 goto bad;
263 }
264 /* Shouldn't happen... */
265 if (m == NULL) {
266 IPCOMPSTAT_INC(ipcomps_crypto);
267 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
268 error = EINVAL;
269 goto bad;
270 }
271 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
272
273 clen = crp->crp_olen; /* Length of data after processing */
274
275 /* Release the crypto descriptors */
276 free(tc, M_XDATA), tc = NULL;
277 crypto_freereq(crp), crp = NULL;
278
279 /* In case it's not done already, adjust the size of the mbuf chain */
280 m->m_pkthdr.len = clen + hlen + skip;
281
282 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
283 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
284 DPRINTF(("%s: m_pullup failed\n", __func__));
285 error = EINVAL; /*XXX*/
286 goto bad;
287 }
288
289 /* Keep the next protocol field */
290 addr = (caddr_t) mtod(m, struct ip *) + skip;
291 nproto = ((struct ipcomp *) addr)->comp_nxt;
292
293 /* Remove the IPCOMP header */
294 error = m_striphdr(m, skip, hlen);
295 if (error) {
296 IPCOMPSTAT_INC(ipcomps_hdrops);
297 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
298 ipsec_address(&sav->sah->saidx.dst),
299 (u_long) ntohl(sav->spi)));
300 goto bad;
301 }
302
303 /* Restore the Next Protocol field */
304 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
305
306 switch (saidx->dst.sa.sa_family) {
307#ifdef INET6
308 case AF_INET6:
309 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL);
310 break;
311#endif
312#ifdef INET
313 case AF_INET:
314 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL);
315 break;
316#endif
317 default:
318 panic("%s: Unexpected address family: %d saidx=%p", __func__,
319 saidx->dst.sa.sa_family, saidx);
320 }
321
322 KEY_FREESAV(&sav);
323 return error;
324bad:
325 if (sav)
326 KEY_FREESAV(&sav);
327 if (m)
328 m_freem(m);
329 if (tc != NULL)
330 free(tc, M_XDATA);
331 if (crp)
332 crypto_freereq(crp);
333 return error;
334}
335
336/*
337 * IPComp output routine, called by ipsec[46]_process_packet()
338 */
339static int
340ipcomp_output(
341 struct mbuf *m,
342 struct ipsecrequest *isr,
343 struct mbuf **mp,
344 int skip,
345 int protoff
346)
347{
348 struct secasvar *sav;
349 struct comp_algo *ipcompx;
350 int error, ralen, maxpacketsize;
351 struct cryptodesc *crdc;
352 struct cryptop *crp;
353 struct tdb_crypto *tc;
354
355 sav = isr->sav;
356 IPSEC_ASSERT(sav != NULL, ("null SA"));
357 ipcompx = sav->tdb_compalgxform;
358 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
359
360 /*
361 * Do not touch the packet in case our payload to compress
362 * is lower than the minimal threshold of the compression
363 * alogrithm. We will just send out the data uncompressed.
364 * See RFC 3173, 2.2. Non-Expansion Policy.
365 */
366 if (m->m_pkthdr.len <= ipcompx->minlen) {
367 IPCOMPSTAT_INC(ipcomps_threshold);
368 return ipsec_process_done(m, isr);
369 }
370
371 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
372 IPCOMPSTAT_INC(ipcomps_output);
373
374 /* Check for maximum packet size violations. */
375 switch (sav->sah->saidx.dst.sa.sa_family) {
376#ifdef INET
377 case AF_INET:
378 maxpacketsize = IP_MAXPACKET;
379 break;
380#endif /* INET */
381#ifdef INET6
382 case AF_INET6:
383 maxpacketsize = IPV6_MAXPACKET;
384 break;
385#endif /* INET6 */
386 default:
387 IPCOMPSTAT_INC(ipcomps_nopf);
388 DPRINTF(("%s: unknown/unsupported protocol family %d, "
389 "IPCA %s/%08lx\n", __func__,
390 sav->sah->saidx.dst.sa.sa_family,
391 ipsec_address(&sav->sah->saidx.dst),
392 (u_long) ntohl(sav->spi)));
393 error = EPFNOSUPPORT;
394 goto bad;
395 }
396 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
397 IPCOMPSTAT_INC(ipcomps_toobig);
398 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
399 "(len %u, max len %u)\n", __func__,
400 ipsec_address(&sav->sah->saidx.dst),
401 (u_long) ntohl(sav->spi),
402 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
403 error = EMSGSIZE;
404 goto bad;
405 }
406
407 /* Update the counters */
408 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
409
410 m = m_unshare(m, M_NOWAIT);
411 if (m == NULL) {
412 IPCOMPSTAT_INC(ipcomps_hdrops);
413 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
414 __func__, ipsec_address(&sav->sah->saidx.dst),
415 (u_long) ntohl(sav->spi)));
416 error = ENOBUFS;
417 goto bad;
418 }
419
420 /* Ok now, we can pass to the crypto processing. */
421
422 /* Get crypto descriptors */
423 crp = crypto_getreq(1);
424 if (crp == NULL) {
425 IPCOMPSTAT_INC(ipcomps_crypto);
426 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
427 error = ENOBUFS;
428 goto bad;
429 }
430 crdc = crp->crp_desc;
431
432 /* Compression descriptor */
433 crdc->crd_skip = skip;
434 crdc->crd_len = ralen;
435 crdc->crd_flags = CRD_F_COMP;
436 crdc->crd_inject = skip;
437
438 /* Compression operation */
439 crdc->crd_alg = ipcompx->type;
440
441 /* IPsec-specific opaque crypto info */
442 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
443 M_XDATA, M_NOWAIT|M_ZERO);
444 if (tc == NULL) {
445 IPCOMPSTAT_INC(ipcomps_crypto);
446 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
447 crypto_freereq(crp);
448 error = ENOBUFS;
449 goto bad;
450 }
451
452 tc->tc_isr = isr;
453 KEY_ADDREFSA(sav);
454 tc->tc_sav = sav;
455 tc->tc_spi = sav->spi;
456 tc->tc_dst = sav->sah->saidx.dst;
457 tc->tc_proto = sav->sah->saidx.proto;
458 tc->tc_protoff = protoff;
459 tc->tc_skip = skip;
460
461 /* Crypto operation descriptor */
462 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
463 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
464 crp->crp_buf = (caddr_t) m;
465 crp->crp_callback = ipcomp_output_cb;
466 crp->crp_opaque = (caddr_t) tc;
467 crp->crp_sid = sav->tdb_cryptoid;
468
469 return crypto_dispatch(crp);
470bad:
471 if (m)
472 m_freem(m);
473 return (error);
474}
475
476/*
477 * IPComp output callback from the crypto driver.
478 */
479static int
480ipcomp_output_cb(struct cryptop *crp)
481{
482 struct tdb_crypto *tc;
483 struct ipsecrequest *isr;
484 struct secasvar *sav;
485 struct mbuf *m;
486 int error, skip;
487
488 tc = (struct tdb_crypto *) crp->crp_opaque;
489 IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
490 m = (struct mbuf *) crp->crp_buf;
491 skip = tc->tc_skip;
492
493 isr = tc->tc_isr;
494 IPSECREQUEST_LOCK(isr);
495 sav = tc->tc_sav;
496 /* With the isr lock released SA pointer can be updated. */
497 if (sav != isr->sav) {
498 IPCOMPSTAT_INC(ipcomps_notdb);
499 DPRINTF(("%s: SA expired while in crypto\n", __func__));
500 error = ENOBUFS; /*XXX*/
501 goto bad;
502 }
503
504 /* Check for crypto errors */
505 if (crp->crp_etype) {
506 /* Reset the session ID */
507 if (sav->tdb_cryptoid != 0)
508 sav->tdb_cryptoid = crp->crp_sid;
509
510 if (crp->crp_etype == EAGAIN) {
511 IPSECREQUEST_UNLOCK(isr);
512 return crypto_dispatch(crp);
513 }
514 IPCOMPSTAT_INC(ipcomps_noxform);
515 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
516 error = crp->crp_etype;
517 goto bad;
518 }
519 /* Shouldn't happen... */
520 if (m == NULL) {
521 IPCOMPSTAT_INC(ipcomps_crypto);
522 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
523 error = EINVAL;
524 goto bad;
525 }
526 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
527
528 if (crp->crp_ilen - skip > crp->crp_olen) {
529 struct mbuf *mo;
530 struct ipcomp *ipcomp;
531 int roff;
532 uint8_t prot;
533
534 /* Compression helped, inject IPCOMP header. */
535 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
536 if (mo == NULL) {
537 IPCOMPSTAT_INC(ipcomps_wrap);
538 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
539 __func__, ipsec_address(&sav->sah->saidx.dst),
540 (u_long) ntohl(sav->spi)));
541 error = ENOBUFS;
542 goto bad;
543 }
544 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
545
546 /* Initialize the IPCOMP header */
547 /* XXX alignment always correct? */
548 switch (sav->sah->saidx.dst.sa.sa_family) {
549#ifdef INET
550 case AF_INET:
551 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
552 break;
553#endif /* INET */
554#ifdef INET6
555 case AF_INET6:
556 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
557 break;
558#endif
559 }
560 ipcomp->comp_flags = 0;
561 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
562
563 /* Fix Next Protocol in IPv4/IPv6 header */
564 prot = IPPROTO_IPCOMP;
565 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
566 (u_char *)&prot);
567
568 /* Adjust the length in the IP header */
569 switch (sav->sah->saidx.dst.sa.sa_family) {
570#ifdef INET
571 case AF_INET:
572 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
573 break;
574#endif /* INET */
575#ifdef INET6
576 case AF_INET6:
577 mtod(m, struct ip6_hdr *)->ip6_plen =
578 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
579 break;
580#endif /* INET6 */
581 default:
582 IPCOMPSTAT_INC(ipcomps_nopf);
583 DPRINTF(("%s: unknown/unsupported protocol "
584 "family %d, IPCA %s/%08lx\n", __func__,
585 sav->sah->saidx.dst.sa.sa_family,
586 ipsec_address(&sav->sah->saidx.dst),
587 (u_long) ntohl(sav->spi)));
588 error = EPFNOSUPPORT;
589 goto bad;
590 }
591 } else {
592 /* Compression was useless, we have lost time. */
593 IPCOMPSTAT_INC(ipcomps_uncompr);
594 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
595 __func__, crp->crp_ilen, skip, crp->crp_olen));
596 /* XXX remember state to not compress the next couple
597 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
598 }
599
600 /* Release the crypto descriptor */
601 free(tc, M_XDATA);
602 crypto_freereq(crp);
603
604 /* NB: m is reclaimed by ipsec_process_done. */
605 error = ipsec_process_done(m, isr);
606 KEY_FREESAV(&sav);
607 IPSECREQUEST_UNLOCK(isr);
608 return error;
609bad:
610 if (sav)
611 KEY_FREESAV(&sav);
612 IPSECREQUEST_UNLOCK(isr);
613 if (m)
614 m_freem(m);
615 free(tc, M_XDATA);
616 crypto_freereq(crp);
617 return error;
618}
619
620static struct xformsw ipcomp_xformsw = {
621 XF_IPCOMP, XFT_COMP, "IPcomp",
622 ipcomp_init, ipcomp_zeroize, ipcomp_input,
623 ipcomp_output
624};
625
626static void
627ipcomp_attach(void)
628{
629
630 xform_register(&ipcomp_xformsw);
631}
632
633SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
634
635static void
636vnet_ipcomp_attach(const void *unused __unused)
637{
638
| 2/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
3
4/*-
5 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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.
18 *
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.
29 */
30
31/* IP payload compression protocol (IPComp), see RFC 2393 */
32#include "opt_inet.h"
33#include "opt_inet6.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/mbuf.h>
38#include <sys/lock.h>
39#include <sys/mutex.h>
40#include <sys/rwlock.h>
41#include <sys/socket.h>
42#include <sys/kernel.h>
43#include <sys/protosw.h>
44#include <sys/sysctl.h>
45
46#include <netinet/in.h>
47#include <netinet/in_systm.h>
48#include <netinet/ip.h>
49#include <netinet/ip_var.h>
50
51#include <net/route.h>
52#include <net/vnet.h>
53
54#include <netipsec/ipsec.h>
55#include <netipsec/xform.h>
56
57#ifdef INET6
58#include <netinet/ip6.h>
59#include <netipsec/ipsec6.h>
60#endif
61
62#include <netipsec/ipcomp.h>
63#include <netipsec/ipcomp_var.h>
64
65#include <netipsec/key.h>
66#include <netipsec/key_debug.h>
67
68#include <opencrypto/cryptodev.h>
69#include <opencrypto/deflate.h>
70#include <opencrypto/xform.h>
71
72VNET_DEFINE(int, ipcomp_enable) = 1;
73VNET_DEFINE(struct ipcompstat, ipcompstat);
74
75SYSCTL_DECL(_net_inet_ipcomp);
76SYSCTL_VNET_INT(_net_inet_ipcomp, OID_AUTO,
77 ipcomp_enable, CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
78SYSCTL_VNET_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
79 stats, CTLFLAG_RD, &VNET_NAME(ipcompstat), ipcompstat, "");
80
81static int ipcomp_input_cb(struct cryptop *crp);
82static int ipcomp_output_cb(struct cryptop *crp);
83
84struct comp_algo *
85ipcomp_algorithm_lookup(int alg)
86{
87 if (alg >= IPCOMP_ALG_MAX)
88 return NULL;
89 switch (alg) {
90 case SADB_X_CALG_DEFLATE:
91 return &comp_algo_deflate;
92 }
93 return NULL;
94}
95
96/*
97 * ipcomp_init() is called when an CPI is being set up.
98 */
99static int
100ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
101{
102 struct comp_algo *tcomp;
103 struct cryptoini cric;
104
105 /* NB: algorithm really comes in alg_enc and not alg_comp! */
106 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
107 if (tcomp == NULL) {
108 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
109 sav->alg_comp));
110 return EINVAL;
111 }
112 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
113 sav->tdb_xform = xsp;
114 sav->tdb_compalgxform = tcomp;
115
116 /* Initialize crypto session */
117 bzero(&cric, sizeof (cric));
118 cric.cri_alg = sav->tdb_compalgxform->type;
119
120 return crypto_newsession(&sav->tdb_cryptoid, &cric, V_crypto_support);
121}
122
123/*
124 * ipcomp_zeroize() used when IPCA is deleted
125 */
126static int
127ipcomp_zeroize(struct secasvar *sav)
128{
129 int err;
130
131 err = crypto_freesession(sav->tdb_cryptoid);
132 sav->tdb_cryptoid = 0;
133 return err;
134}
135
136/*
137 * ipcomp_input() gets called to uncompress an input packet
138 */
139static int
140ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
141{
142 struct tdb_crypto *tc;
143 struct cryptodesc *crdc;
144 struct cryptop *crp;
145 struct ipcomp *ipcomp;
146 caddr_t addr;
147 int hlen = IPCOMP_HLENGTH;
148
149 /*
150 * Check that the next header of the IPComp is not IPComp again, before
151 * doing any real work. Given it is not possible to do double
152 * compression it means someone is playing tricks on us.
153 */
154 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
155 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
156 DPRINTF(("%s: m_pullup failed\n", __func__));
157 return (ENOBUFS);
158 }
159 addr = (caddr_t) mtod(m, struct ip *) + skip;
160 ipcomp = (struct ipcomp *)addr;
161 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
162 m_freem(m);
163 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
164 DPRINTF(("%s: recursive compression detected\n", __func__));
165 return (EINVAL);
166 }
167
168 /* Get crypto descriptors */
169 crp = crypto_getreq(1);
170 if (crp == NULL) {
171 m_freem(m);
172 DPRINTF(("%s: no crypto descriptors\n", __func__));
173 IPCOMPSTAT_INC(ipcomps_crypto);
174 return ENOBUFS;
175 }
176 /* Get IPsec-specific opaque pointer */
177 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
178 if (tc == NULL) {
179 m_freem(m);
180 crypto_freereq(crp);
181 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
182 IPCOMPSTAT_INC(ipcomps_crypto);
183 return ENOBUFS;
184 }
185 crdc = crp->crp_desc;
186
187 crdc->crd_skip = skip + hlen;
188 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
189 crdc->crd_inject = skip;
190
191 tc->tc_ptr = 0;
192
193 /* Decompression operation */
194 crdc->crd_alg = sav->tdb_compalgxform->type;
195
196 /* Crypto operation descriptor */
197 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
198 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
199 crp->crp_buf = (caddr_t) m;
200 crp->crp_callback = ipcomp_input_cb;
201 crp->crp_sid = sav->tdb_cryptoid;
202 crp->crp_opaque = (caddr_t) tc;
203
204 /* These are passed as-is to the callback */
205 tc->tc_spi = sav->spi;
206 tc->tc_dst = sav->sah->saidx.dst;
207 tc->tc_proto = sav->sah->saidx.proto;
208 tc->tc_protoff = protoff;
209 tc->tc_skip = skip;
210 KEY_ADDREFSA(sav);
211 tc->tc_sav = sav;
212
213 return crypto_dispatch(crp);
214}
215
216/*
217 * IPComp input callback from the crypto driver.
218 */
219static int
220ipcomp_input_cb(struct cryptop *crp)
221{
222 struct cryptodesc *crd;
223 struct tdb_crypto *tc;
224 int skip, protoff;
225 struct mtag *mtag;
226 struct mbuf *m;
227 struct secasvar *sav;
228 struct secasindex *saidx;
229 int hlen = IPCOMP_HLENGTH, error, clen;
230 u_int8_t nproto;
231 caddr_t addr;
232
233 crd = crp->crp_desc;
234
235 tc = (struct tdb_crypto *) crp->crp_opaque;
236 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
237 skip = tc->tc_skip;
238 protoff = tc->tc_protoff;
239 mtag = (struct mtag *) tc->tc_ptr;
240 m = (struct mbuf *) crp->crp_buf;
241
242 sav = tc->tc_sav;
243 IPSEC_ASSERT(sav != NULL, ("null SA!"));
244
245 saidx = &sav->sah->saidx;
246 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
247 saidx->dst.sa.sa_family == AF_INET6,
248 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
249
250 /* Check for crypto errors */
251 if (crp->crp_etype) {
252 /* Reset the session ID */
253 if (sav->tdb_cryptoid != 0)
254 sav->tdb_cryptoid = crp->crp_sid;
255
256 if (crp->crp_etype == EAGAIN) {
257 return crypto_dispatch(crp);
258 }
259 IPCOMPSTAT_INC(ipcomps_noxform);
260 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
261 error = crp->crp_etype;
262 goto bad;
263 }
264 /* Shouldn't happen... */
265 if (m == NULL) {
266 IPCOMPSTAT_INC(ipcomps_crypto);
267 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
268 error = EINVAL;
269 goto bad;
270 }
271 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
272
273 clen = crp->crp_olen; /* Length of data after processing */
274
275 /* Release the crypto descriptors */
276 free(tc, M_XDATA), tc = NULL;
277 crypto_freereq(crp), crp = NULL;
278
279 /* In case it's not done already, adjust the size of the mbuf chain */
280 m->m_pkthdr.len = clen + hlen + skip;
281
282 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
283 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
284 DPRINTF(("%s: m_pullup failed\n", __func__));
285 error = EINVAL; /*XXX*/
286 goto bad;
287 }
288
289 /* Keep the next protocol field */
290 addr = (caddr_t) mtod(m, struct ip *) + skip;
291 nproto = ((struct ipcomp *) addr)->comp_nxt;
292
293 /* Remove the IPCOMP header */
294 error = m_striphdr(m, skip, hlen);
295 if (error) {
296 IPCOMPSTAT_INC(ipcomps_hdrops);
297 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
298 ipsec_address(&sav->sah->saidx.dst),
299 (u_long) ntohl(sav->spi)));
300 goto bad;
301 }
302
303 /* Restore the Next Protocol field */
304 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
305
306 switch (saidx->dst.sa.sa_family) {
307#ifdef INET6
308 case AF_INET6:
309 error = ipsec6_common_input_cb(m, sav, skip, protoff, NULL);
310 break;
311#endif
312#ifdef INET
313 case AF_INET:
314 error = ipsec4_common_input_cb(m, sav, skip, protoff, NULL);
315 break;
316#endif
317 default:
318 panic("%s: Unexpected address family: %d saidx=%p", __func__,
319 saidx->dst.sa.sa_family, saidx);
320 }
321
322 KEY_FREESAV(&sav);
323 return error;
324bad:
325 if (sav)
326 KEY_FREESAV(&sav);
327 if (m)
328 m_freem(m);
329 if (tc != NULL)
330 free(tc, M_XDATA);
331 if (crp)
332 crypto_freereq(crp);
333 return error;
334}
335
336/*
337 * IPComp output routine, called by ipsec[46]_process_packet()
338 */
339static int
340ipcomp_output(
341 struct mbuf *m,
342 struct ipsecrequest *isr,
343 struct mbuf **mp,
344 int skip,
345 int protoff
346)
347{
348 struct secasvar *sav;
349 struct comp_algo *ipcompx;
350 int error, ralen, maxpacketsize;
351 struct cryptodesc *crdc;
352 struct cryptop *crp;
353 struct tdb_crypto *tc;
354
355 sav = isr->sav;
356 IPSEC_ASSERT(sav != NULL, ("null SA"));
357 ipcompx = sav->tdb_compalgxform;
358 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
359
360 /*
361 * Do not touch the packet in case our payload to compress
362 * is lower than the minimal threshold of the compression
363 * alogrithm. We will just send out the data uncompressed.
364 * See RFC 3173, 2.2. Non-Expansion Policy.
365 */
366 if (m->m_pkthdr.len <= ipcompx->minlen) {
367 IPCOMPSTAT_INC(ipcomps_threshold);
368 return ipsec_process_done(m, isr);
369 }
370
371 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
372 IPCOMPSTAT_INC(ipcomps_output);
373
374 /* Check for maximum packet size violations. */
375 switch (sav->sah->saidx.dst.sa.sa_family) {
376#ifdef INET
377 case AF_INET:
378 maxpacketsize = IP_MAXPACKET;
379 break;
380#endif /* INET */
381#ifdef INET6
382 case AF_INET6:
383 maxpacketsize = IPV6_MAXPACKET;
384 break;
385#endif /* INET6 */
386 default:
387 IPCOMPSTAT_INC(ipcomps_nopf);
388 DPRINTF(("%s: unknown/unsupported protocol family %d, "
389 "IPCA %s/%08lx\n", __func__,
390 sav->sah->saidx.dst.sa.sa_family,
391 ipsec_address(&sav->sah->saidx.dst),
392 (u_long) ntohl(sav->spi)));
393 error = EPFNOSUPPORT;
394 goto bad;
395 }
396 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
397 IPCOMPSTAT_INC(ipcomps_toobig);
398 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
399 "(len %u, max len %u)\n", __func__,
400 ipsec_address(&sav->sah->saidx.dst),
401 (u_long) ntohl(sav->spi),
402 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
403 error = EMSGSIZE;
404 goto bad;
405 }
406
407 /* Update the counters */
408 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
409
410 m = m_unshare(m, M_NOWAIT);
411 if (m == NULL) {
412 IPCOMPSTAT_INC(ipcomps_hdrops);
413 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
414 __func__, ipsec_address(&sav->sah->saidx.dst),
415 (u_long) ntohl(sav->spi)));
416 error = ENOBUFS;
417 goto bad;
418 }
419
420 /* Ok now, we can pass to the crypto processing. */
421
422 /* Get crypto descriptors */
423 crp = crypto_getreq(1);
424 if (crp == NULL) {
425 IPCOMPSTAT_INC(ipcomps_crypto);
426 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
427 error = ENOBUFS;
428 goto bad;
429 }
430 crdc = crp->crp_desc;
431
432 /* Compression descriptor */
433 crdc->crd_skip = skip;
434 crdc->crd_len = ralen;
435 crdc->crd_flags = CRD_F_COMP;
436 crdc->crd_inject = skip;
437
438 /* Compression operation */
439 crdc->crd_alg = ipcompx->type;
440
441 /* IPsec-specific opaque crypto info */
442 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
443 M_XDATA, M_NOWAIT|M_ZERO);
444 if (tc == NULL) {
445 IPCOMPSTAT_INC(ipcomps_crypto);
446 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
447 crypto_freereq(crp);
448 error = ENOBUFS;
449 goto bad;
450 }
451
452 tc->tc_isr = isr;
453 KEY_ADDREFSA(sav);
454 tc->tc_sav = sav;
455 tc->tc_spi = sav->spi;
456 tc->tc_dst = sav->sah->saidx.dst;
457 tc->tc_proto = sav->sah->saidx.proto;
458 tc->tc_protoff = protoff;
459 tc->tc_skip = skip;
460
461 /* Crypto operation descriptor */
462 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
463 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
464 crp->crp_buf = (caddr_t) m;
465 crp->crp_callback = ipcomp_output_cb;
466 crp->crp_opaque = (caddr_t) tc;
467 crp->crp_sid = sav->tdb_cryptoid;
468
469 return crypto_dispatch(crp);
470bad:
471 if (m)
472 m_freem(m);
473 return (error);
474}
475
476/*
477 * IPComp output callback from the crypto driver.
478 */
479static int
480ipcomp_output_cb(struct cryptop *crp)
481{
482 struct tdb_crypto *tc;
483 struct ipsecrequest *isr;
484 struct secasvar *sav;
485 struct mbuf *m;
486 int error, skip;
487
488 tc = (struct tdb_crypto *) crp->crp_opaque;
489 IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
490 m = (struct mbuf *) crp->crp_buf;
491 skip = tc->tc_skip;
492
493 isr = tc->tc_isr;
494 IPSECREQUEST_LOCK(isr);
495 sav = tc->tc_sav;
496 /* With the isr lock released SA pointer can be updated. */
497 if (sav != isr->sav) {
498 IPCOMPSTAT_INC(ipcomps_notdb);
499 DPRINTF(("%s: SA expired while in crypto\n", __func__));
500 error = ENOBUFS; /*XXX*/
501 goto bad;
502 }
503
504 /* Check for crypto errors */
505 if (crp->crp_etype) {
506 /* Reset the session ID */
507 if (sav->tdb_cryptoid != 0)
508 sav->tdb_cryptoid = crp->crp_sid;
509
510 if (crp->crp_etype == EAGAIN) {
511 IPSECREQUEST_UNLOCK(isr);
512 return crypto_dispatch(crp);
513 }
514 IPCOMPSTAT_INC(ipcomps_noxform);
515 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
516 error = crp->crp_etype;
517 goto bad;
518 }
519 /* Shouldn't happen... */
520 if (m == NULL) {
521 IPCOMPSTAT_INC(ipcomps_crypto);
522 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
523 error = EINVAL;
524 goto bad;
525 }
526 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
527
528 if (crp->crp_ilen - skip > crp->crp_olen) {
529 struct mbuf *mo;
530 struct ipcomp *ipcomp;
531 int roff;
532 uint8_t prot;
533
534 /* Compression helped, inject IPCOMP header. */
535 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
536 if (mo == NULL) {
537 IPCOMPSTAT_INC(ipcomps_wrap);
538 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
539 __func__, ipsec_address(&sav->sah->saidx.dst),
540 (u_long) ntohl(sav->spi)));
541 error = ENOBUFS;
542 goto bad;
543 }
544 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
545
546 /* Initialize the IPCOMP header */
547 /* XXX alignment always correct? */
548 switch (sav->sah->saidx.dst.sa.sa_family) {
549#ifdef INET
550 case AF_INET:
551 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
552 break;
553#endif /* INET */
554#ifdef INET6
555 case AF_INET6:
556 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
557 break;
558#endif
559 }
560 ipcomp->comp_flags = 0;
561 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
562
563 /* Fix Next Protocol in IPv4/IPv6 header */
564 prot = IPPROTO_IPCOMP;
565 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
566 (u_char *)&prot);
567
568 /* Adjust the length in the IP header */
569 switch (sav->sah->saidx.dst.sa.sa_family) {
570#ifdef INET
571 case AF_INET:
572 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
573 break;
574#endif /* INET */
575#ifdef INET6
576 case AF_INET6:
577 mtod(m, struct ip6_hdr *)->ip6_plen =
578 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
579 break;
580#endif /* INET6 */
581 default:
582 IPCOMPSTAT_INC(ipcomps_nopf);
583 DPRINTF(("%s: unknown/unsupported protocol "
584 "family %d, IPCA %s/%08lx\n", __func__,
585 sav->sah->saidx.dst.sa.sa_family,
586 ipsec_address(&sav->sah->saidx.dst),
587 (u_long) ntohl(sav->spi)));
588 error = EPFNOSUPPORT;
589 goto bad;
590 }
591 } else {
592 /* Compression was useless, we have lost time. */
593 IPCOMPSTAT_INC(ipcomps_uncompr);
594 DPRINTF(("%s: compressions was useless %d - %d <= %d\n",
595 __func__, crp->crp_ilen, skip, crp->crp_olen));
596 /* XXX remember state to not compress the next couple
597 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
598 }
599
600 /* Release the crypto descriptor */
601 free(tc, M_XDATA);
602 crypto_freereq(crp);
603
604 /* NB: m is reclaimed by ipsec_process_done. */
605 error = ipsec_process_done(m, isr);
606 KEY_FREESAV(&sav);
607 IPSECREQUEST_UNLOCK(isr);
608 return error;
609bad:
610 if (sav)
611 KEY_FREESAV(&sav);
612 IPSECREQUEST_UNLOCK(isr);
613 if (m)
614 m_freem(m);
615 free(tc, M_XDATA);
616 crypto_freereq(crp);
617 return error;
618}
619
620static struct xformsw ipcomp_xformsw = {
621 XF_IPCOMP, XFT_COMP, "IPcomp",
622 ipcomp_init, ipcomp_zeroize, ipcomp_input,
623 ipcomp_output
624};
625
626static void
627ipcomp_attach(void)
628{
629
630 xform_register(&ipcomp_xformsw);
631}
632
633SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
634
635static void
636vnet_ipcomp_attach(const void *unused __unused)
637{
638
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