1 /* $FreeBSD$ */
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/socket.h>
41 #include <sys/kernel.h>
42 #include <sys/protosw.h>
43 #include <sys/sysctl.h>
44
45 #include <netinet/in.h>
46 #include <netinet/in_systm.h>
47 #include <netinet/ip.h>
48 #include <netinet/ip_var.h>
49
50 #include <net/route.h>
51 #include <netipsec/ipsec.h>
52 #include <netipsec/xform.h>
53
54 #ifdef INET6
55 #include <netinet/ip6.h>
56 #include <netipsec/ipsec6.h>
57 #endif
58
59 #include <netipsec/ipcomp.h>
60 #include <netipsec/ipcomp_var.h>
61
62 #include <netipsec/key.h>
63 #include <netipsec/key_debug.h>
64
65 #include <opencrypto/cryptodev.h>
66 #include <opencrypto/deflate.h>
67 #include <opencrypto/xform.h>
68
69 int ipcomp_enable = 1;
70 struct ipcompstat ipcompstat;
71
72 SYSCTL_DECL(_net_inet_ipcomp);
73 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
74 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, "");
75 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
76 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, "");
77
78 static int ipcomp_input_cb(struct cryptop *crp);
79 static int ipcomp_output_cb(struct cryptop *crp);
80
81 struct comp_algo *
82 ipcomp_algorithm_lookup(int alg)
83 {
84 if (alg >= IPCOMP_ALG_MAX)
85 return NULL;
86 switch (alg) {
87 case SADB_X_CALG_DEFLATE:
88 return &comp_algo_deflate;
89 }
90 return NULL;
91 }
92
93 /*
94 * ipcomp_init() is called when an CPI is being set up.
95 */
96 static int
97 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
98 {
99 struct comp_algo *tcomp;
100 struct cryptoini cric;
101
102 /* NB: algorithm really comes in alg_enc and not alg_comp! */
103 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
104 if (tcomp == NULL) {
105 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
106 sav->alg_comp));
107 return EINVAL;
108 }
109 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
110 sav->tdb_xform = xsp;
111 sav->tdb_compalgxform = tcomp;
112
113 /* Initialize crypto session */
114 bzero(&cric, sizeof (cric));
115 cric.cri_alg = sav->tdb_compalgxform->type;
116
117 return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
118 }
119
120 /*
121 * ipcomp_zeroize() used when IPCA is deleted
122 */
123 static int
124 ipcomp_zeroize(struct secasvar *sav)
125 {
126 int err;
127
128 err = crypto_freesession(sav->tdb_cryptoid);
129 sav->tdb_cryptoid = 0;
130 return err;
131 }
132
133 /*
134 * ipcomp_input() gets called to uncompress an input packet
135 */
136 static int
137 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
138 {
139 struct tdb_crypto *tc;
140 struct cryptodesc *crdc;
141 struct cryptop *crp;
142 struct ipcomp *ipcomp;
143 caddr_t addr;
144 int hlen = IPCOMP_HLENGTH;
145
146 IPSEC_SPLASSERT_SOFTNET(__func__);
147
148 /*
149 * Check that the next header of the IPComp is not IPComp again, before
150 * doing any real work. Given it is not possible to do double
151 * compression it means someone is playing tricks on us.
152 */
153 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
154 ipcompstat.ipcomps_hdrops++; /*XXX*/
155 DPRINTF(("%s: m_pullup failed\n", __func__));
156 return (ENOBUFS);
157 }
158 addr = (caddr_t) mtod(m, struct ip *) + skip;
159 ipcomp = (struct ipcomp *)addr;
160 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
161 m_freem(m);
162 ipcompstat.ipcomps_pdrops++; /* XXX have our own stats? */
163 DPRINTF(("%s: recursive compression detected\n", __func__));
164 return (EINVAL);
165 }
166
167 /* Get crypto descriptors */
168 crp = crypto_getreq(1);
169 if (crp == NULL) {
170 m_freem(m);
171 DPRINTF(("%s: no crypto descriptors\n", __func__));
172 ipcompstat.ipcomps_crypto++;
173 return ENOBUFS;
174 }
175 /* Get IPsec-specific opaque pointer */
176 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
177 if (tc == NULL) {
178 m_freem(m);
179 crypto_freereq(crp);
180 DPRINTF(("%s: cannot allocate tdb_crypto\n", __func__));
181 ipcompstat.ipcomps_crypto++;
182 return ENOBUFS;
183 }
184 crdc = crp->crp_desc;
185
186 crdc->crd_skip = skip + hlen;
187 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
188 crdc->crd_inject = skip;
189
190 tc->tc_ptr = 0;
191
192 /* Decompression operation */
193 crdc->crd_alg = sav->tdb_compalgxform->type;
194
195 /* Crypto operation descriptor */
196 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
197 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
198 crp->crp_buf = (caddr_t) m;
199 crp->crp_callback = ipcomp_input_cb;
200 crp->crp_sid = sav->tdb_cryptoid;
201 crp->crp_opaque = (caddr_t) tc;
202
203 /* These are passed as-is to the callback */
204 tc->tc_spi = sav->spi;
205 tc->tc_dst = sav->sah->saidx.dst;
206 tc->tc_proto = sav->sah->saidx.proto;
207 tc->tc_protoff = protoff;
208 tc->tc_skip = skip;
209
210 return crypto_dispatch(crp);
211 }
212
213 #ifdef INET6
214 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
215 if (saidx->dst.sa.sa_family == AF_INET6) { \
216 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
217 } else { \
218 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
219 } \
220 } while (0)
221 #else
222 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
223 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
224 #endif
225
226 /*
227 * IPComp input callback from the crypto driver.
228 */
229 static int
230 ipcomp_input_cb(struct cryptop *crp)
231 {
232 struct cryptodesc *crd;
233 struct tdb_crypto *tc;
234 int skip, protoff;
235 struct mtag *mtag;
236 struct mbuf *m;
237 struct secasvar *sav;
238 struct secasindex *saidx;
239 int hlen = IPCOMP_HLENGTH, error, clen;
240 u_int8_t nproto;
241 caddr_t addr;
242
243 NET_LOCK_GIANT();
244
245 crd = crp->crp_desc;
246
247 tc = (struct tdb_crypto *) crp->crp_opaque;
248 IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
249 skip = tc->tc_skip;
250 protoff = tc->tc_protoff;
251 mtag = (struct mtag *) tc->tc_ptr;
252 m = (struct mbuf *) crp->crp_buf;
253
254 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
255 if (sav == NULL) {
256 ipcompstat.ipcomps_notdb++;
257 DPRINTF(("%s: SA expired while in crypto\n", __func__));
258 error = ENOBUFS; /*XXX*/
259 goto bad;
260 }
261
262 saidx = &sav->sah->saidx;
263 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
264 saidx->dst.sa.sa_family == AF_INET6,
265 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
266
267 /* Check for crypto errors */
268 if (crp->crp_etype) {
269 /* Reset the session ID */
270 if (sav->tdb_cryptoid != 0)
271 sav->tdb_cryptoid = crp->crp_sid;
272
273 if (crp->crp_etype == EAGAIN) {
274 KEY_FREESAV(&sav);
275 error = crypto_dispatch(crp);
276 NET_UNLOCK_GIANT();
277 return error;
278 }
279 ipcompstat.ipcomps_noxform++;
280 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
281 error = crp->crp_etype;
282 goto bad;
283 }
284 /* Shouldn't happen... */
285 if (m == NULL) {
286 ipcompstat.ipcomps_crypto++;
287 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
288 error = EINVAL;
289 goto bad;
290 }
291 ipcompstat.ipcomps_hist[sav->alg_comp]++;
292
293 clen = crp->crp_olen; /* Length of data after processing */
294
295 /* Release the crypto descriptors */
296 free(tc, M_XDATA), tc = NULL;
297 crypto_freereq(crp), crp = NULL;
298
299 /* In case it's not done already, adjust the size of the mbuf chain */
300 m->m_pkthdr.len = clen + hlen + skip;
301
302 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
303 ipcompstat.ipcomps_hdrops++; /*XXX*/
304 DPRINTF(("%s: m_pullup failed\n", __func__));
305 error = EINVAL; /*XXX*/
306 goto bad;
307 }
308
309 /* Keep the next protocol field */
310 addr = (caddr_t) mtod(m, struct ip *) + skip;
311 nproto = ((struct ipcomp *) addr)->comp_nxt;
312
313 /* Remove the IPCOMP header */
314 error = m_striphdr(m, skip, hlen);
315 if (error) {
316 ipcompstat.ipcomps_hdrops++;
317 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
318 ipsec_address(&sav->sah->saidx.dst),
319 (u_long) ntohl(sav->spi)));
320 goto bad;
321 }
322
323 /* Restore the Next Protocol field */
324 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
325
326 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
327
328 KEY_FREESAV(&sav);
329 NET_UNLOCK_GIANT();
330 return error;
331 bad:
332 if (sav)
333 KEY_FREESAV(&sav);
334 if (m)
335 m_freem(m);
336 if (tc != NULL)
337 free(tc, M_XDATA);
338 if (crp)
339 crypto_freereq(crp);
340 NET_UNLOCK_GIANT();
341 return error;
342 }
343
344 /*
345 * IPComp output routine, called by ipsec[46]_process_packet()
346 */
347 static int
348 ipcomp_output(
349 struct mbuf *m,
350 struct ipsecrequest *isr,
351 struct mbuf **mp,
352 int skip,
353 int protoff
354 )
355 {
356 struct secasvar *sav;
357 struct comp_algo *ipcompx;
358 int error, ralen, maxpacketsize;
359 struct cryptodesc *crdc;
360 struct cryptop *crp;
361 struct tdb_crypto *tc;
362
363 IPSEC_SPLASSERT_SOFTNET(__func__);
364
365 sav = isr->sav;
366 IPSEC_ASSERT(sav != NULL, ("null SA"));
367 ipcompx = sav->tdb_compalgxform;
368 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
369
370 /*
371 * Do not touch the packet in case our payload to compress
372 * is lower than the minimal threshold of the compression
373 * alogrithm. We will just send out the data uncompressed.
374 * See RFC 3173, 2.2. Non-Expansion Policy.
375 */
376 if (m->m_pkthdr.len <= ipcompx->minlen) {
377 /* XXX-BZ V_ipcompstat.threshold++; */
378 return ipsec_process_done(m, isr);
379 }
380
381 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
382 ipcompstat.ipcomps_output++;
383
384 /* Check for maximum packet size violations. */
385 switch (sav->sah->saidx.dst.sa.sa_family) {
386 #ifdef INET
387 case AF_INET:
388 maxpacketsize = IP_MAXPACKET;
389 break;
390 #endif /* INET */
391 #ifdef INET6
392 case AF_INET6:
393 maxpacketsize = IPV6_MAXPACKET;
394 break;
395 #endif /* INET6 */
396 default:
397 ipcompstat.ipcomps_nopf++;
398 DPRINTF(("%s: unknown/unsupported protocol family %d, "
399 "IPCA %s/%08lx\n", __func__,
400 sav->sah->saidx.dst.sa.sa_family,
401 ipsec_address(&sav->sah->saidx.dst),
402 (u_long) ntohl(sav->spi)));
403 error = EPFNOSUPPORT;
404 goto bad;
405 }
406 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
407 ipcompstat.ipcomps_toobig++;
408 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
409 "(len %u, max len %u)\n", __func__,
410 ipsec_address(&sav->sah->saidx.dst),
411 (u_long) ntohl(sav->spi),
412 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
413 error = EMSGSIZE;
414 goto bad;
415 }
416
417 /* Update the counters */
418 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
419
420 m = m_unshare(m, M_NOWAIT);
421 if (m == NULL) {
422 ipcompstat.ipcomps_hdrops++;
423 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
424 __func__, ipsec_address(&sav->sah->saidx.dst),
425 (u_long) ntohl(sav->spi)));
426 error = ENOBUFS;
427 goto bad;
428 }
429
430 /* Ok now, we can pass to the crypto processing. */
431
432 /* Get crypto descriptors */
433 crp = crypto_getreq(1);
434 if (crp == NULL) {
435 ipcompstat.ipcomps_crypto++;
436 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
437 error = ENOBUFS;
438 goto bad;
439 }
440 crdc = crp->crp_desc;
441
442 /* Compression descriptor */
443 crdc->crd_skip = skip;
444 crdc->crd_len = ralen;
445 crdc->crd_flags = CRD_F_COMP;
446 crdc->crd_inject = skip;
447
448 /* Compression operation */
449 crdc->crd_alg = ipcompx->type;
450
451 /* IPsec-specific opaque crypto info */
452 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
453 M_XDATA, M_NOWAIT|M_ZERO);
454 if (tc == NULL) {
455 ipcompstat.ipcomps_crypto++;
456 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
457 crypto_freereq(crp);
458 error = ENOBUFS;
459 goto bad;
460 }
461
462 tc->tc_isr = isr;
463 tc->tc_spi = sav->spi;
464 tc->tc_dst = sav->sah->saidx.dst;
465 tc->tc_proto = sav->sah->saidx.proto;
466 tc->tc_protoff = protoff;
467 tc->tc_skip = skip;
468
469 /* Crypto operation descriptor */
470 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
471 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
472 crp->crp_buf = (caddr_t) m;
473 crp->crp_callback = ipcomp_output_cb;
474 crp->crp_opaque = (caddr_t) tc;
475 crp->crp_sid = sav->tdb_cryptoid;
476
477 return crypto_dispatch(crp);
478 bad:
479 if (m)
480 m_freem(m);
481 return (error);
482 }
483
484 /*
485 * IPComp output callback from the crypto driver.
486 */
487 static int
488 ipcomp_output_cb(struct cryptop *crp)
489 {
490 struct tdb_crypto *tc;
491 struct ipsecrequest *isr;
492 struct secasvar *sav;
493 struct mbuf *m;
494 int error, skip;
495
496 NET_LOCK_GIANT();
497
498 tc = (struct tdb_crypto *) crp->crp_opaque;
499 IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
500 m = (struct mbuf *) crp->crp_buf;
501 skip = tc->tc_skip;
502
503 isr = tc->tc_isr;
504 IPSECREQUEST_LOCK(isr);
505 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
506 if (sav == NULL) {
507 ipcompstat.ipcomps_notdb++;
508 DPRINTF(("%s: SA expired while in crypto\n", __func__));
509 error = ENOBUFS; /*XXX*/
510 goto bad;
511 }
512 IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
513
514 /* Check for crypto errors */
515 if (crp->crp_etype) {
516 /* Reset the session ID */
517 if (sav->tdb_cryptoid != 0)
518 sav->tdb_cryptoid = crp->crp_sid;
519
520 if (crp->crp_etype == EAGAIN) {
521 KEY_FREESAV(&sav);
522 IPSECREQUEST_UNLOCK(isr);
523 error = crypto_dispatch(crp);
524 NET_UNLOCK_GIANT();
525 return error;
526 }
527 ipcompstat.ipcomps_noxform++;
528 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
529 error = crp->crp_etype;
530 goto bad;
531 }
532 /* Shouldn't happen... */
533 if (m == NULL) {
534 ipcompstat.ipcomps_crypto++;
535 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
536 error = EINVAL;
537 goto bad;
538 }
539 ipcompstat.ipcomps_hist[sav->alg_comp]++;
540
541 if (crp->crp_ilen - skip > crp->crp_olen) {
542 struct mbuf *mo;
543 struct ipcomp *ipcomp;
544 int roff;
545 uint8_t prot;
546
547 /* Compression helped, inject IPCOMP header. */
548 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
549 if (mo == NULL) {
550 ipcompstat.ipcomps_wrap++;
551 DPRINTF(("%s: IPCOMP header inject failed for IPCA %s/%08lx\n",
552 __func__, ipsec_address(&sav->sah->saidx.dst),
553 (u_long) ntohl(sav->spi)));
554 error = ENOBUFS;
555 goto bad;
556 }
557 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
558
559 /* Initialize the IPCOMP header */
560 /* XXX alignment always correct? */
561 switch (sav->sah->saidx.dst.sa.sa_family) {
562 #ifdef INET
563 case AF_INET:
564 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
565 break;
566 #endif /* INET */
567 #ifdef INET6
568 case AF_INET6:
569 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
570 break;
571 #endif
572 }
573 ipcomp->comp_flags = 0;
574 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
575
576 /* Fix Next Protocol in IPv4/IPv6 header */
577 prot = IPPROTO_IPCOMP;
578 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t),
579 (u_char *)&prot);
580
581 /* Adjust the length in the IP header */
582 switch (sav->sah->saidx.dst.sa.sa_family) {
583 #ifdef INET
584 case AF_INET:
585 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
586 break;
587 #endif /* INET */
588 #ifdef INET6
589 case AF_INET6:
590 mtod(m, struct ip6_hdr *)->ip6_plen =
591 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
592 break;
593 #endif /* INET6 */
594 default:
595 ipcompstat.ipcomps_nopf++;
596 DPRINTF(("%s: unknown/unsupported protocol "
597 "family %d, IPCA %s/%08lx\n", __func__,
598 sav->sah->saidx.dst.sa.sa_family,
599 ipsec_address(&sav->sah->saidx.dst),
600 (u_long) ntohl(sav->spi)));
601 error = EPFNOSUPPORT;
602 goto bad;
603 }
604 } else {
605 /* compression was useless, we have lost time */
606 /* XXX add statistic */
607 /* XXX remember state to not compress the next couple
608 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
609 }
610
611 /* Release the crypto descriptor */
612 free(tc, M_XDATA);
613 crypto_freereq(crp);
614
615 /* NB: m is reclaimed by ipsec_process_done. */
616 error = ipsec_process_done(m, isr);
617 KEY_FREESAV(&sav);
618 IPSECREQUEST_UNLOCK(isr);
619 NET_UNLOCK_GIANT();
620 return error;
621 bad:
622 if (sav)
623 KEY_FREESAV(&sav);
624 IPSECREQUEST_UNLOCK(isr);
625 if (m)
626 m_freem(m);
627 free(tc, M_XDATA);
628 crypto_freereq(crp);
629 NET_UNLOCK_GIANT();
630 return error;
631 }
632
633 static struct xformsw ipcomp_xformsw = {
634 XF_IPCOMP, XFT_COMP, "IPcomp",
635 ipcomp_init, ipcomp_zeroize, ipcomp_input,
636 ipcomp_output
637 };
638
639 static void
640 ipcomp_attach(void)
641 {
642 xform_register(&ipcomp_xformsw);
643 }
644 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipcomp_attach, NULL);
Cache object: c598ed004633258c12e8ebca71c33821
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