1 /* $NetBSD: xform_ipcomp.c,v 1.8.2.2 2011/04/03 15:16:10 riz Exp $ */
2 /* $FreeBSD: src/sys/netipsec/xform_ipcomp.c,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $ */
3 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
4
5 /*
6 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.8.2.2 2011/04/03 15:16:10 riz Exp $");
34
35 /* IP payload compression protocol (IPComp), see RFC 2393 */
36 #include "opt_inet.h"
37 #ifdef __FreeBSD__
38 #include "opt_inet6.h"
39 #endif
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/mbuf.h>
44 #include <sys/socket.h>
45 #include <sys/kernel.h>
46 #include <sys/protosw.h>
47 #include <sys/sysctl.h>
48
49 #include <netinet/in.h>
50 #include <netinet/in_systm.h>
51 #include <netinet/ip.h>
52 #include <netinet/ip_var.h>
53
54 #include <net/route.h>
55 #include <netipsec/ipsec.h>
56 #include <netipsec/xform.h>
57
58 #ifdef INET6
59 #include <netinet/ip6.h>
60 #include <netipsec/ipsec6.h>
61 #endif
62
63 #include <netipsec/ipcomp.h>
64 #include <netipsec/ipcomp_var.h>
65
66 #include <netipsec/key.h>
67 #include <netipsec/key_debug.h>
68
69 #include <netipsec/ipsec_osdep.h>
70
71 #include <opencrypto/cryptodev.h>
72 #include <opencrypto/deflate.h>
73 #include <opencrypto/xform.h>
74
75 int ipcomp_enable = 1;
76 struct ipcompstat ipcompstat;
77
78 #ifdef __FreeBSD__
79 SYSCTL_DECL(_net_inet_ipcomp);
80 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
81 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, "");
82 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
83 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, "");
84 #endif /* __FreeBSD__ */
85
86 static int ipcomp_input_cb(struct cryptop *crp);
87 static int ipcomp_output_cb(struct cryptop *crp);
88
89 struct comp_algo *
90 ipcomp_algorithm_lookup(int alg)
91 {
92 if (alg >= IPCOMP_ALG_MAX)
93 return NULL;
94 switch (alg) {
95 case SADB_X_CALG_DEFLATE:
96 return &comp_algo_deflate;
97 }
98 return NULL;
99 }
100
101 /*
102 * ipcomp_init() is called when an CPI is being set up.
103 */
104 static int
105 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
106 {
107 struct comp_algo *tcomp;
108 struct cryptoini cric;
109
110 /* NB: algorithm really comes in alg_enc and not alg_comp! */
111 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
112 if (tcomp == NULL) {
113 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
114 sav->alg_comp));
115 return EINVAL;
116 }
117 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
118 sav->tdb_xform = xsp;
119 sav->tdb_compalgxform = tcomp;
120
121 /* Initialize crypto session */
122 bzero(&cric, sizeof (cric));
123 cric.cri_alg = sav->tdb_compalgxform->type;
124
125 return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
126 }
127
128 /*
129 * ipcomp_zeroize() used when IPCA is deleted
130 */
131 static int
132 ipcomp_zeroize(struct secasvar *sav)
133 {
134 int err;
135
136 err = crypto_freesession(sav->tdb_cryptoid);
137 sav->tdb_cryptoid = 0;
138 return err;
139 }
140
141 /*
142 * ipcomp_input() gets called to uncompress an input packet
143 */
144 static int
145 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
146 {
147 struct tdb_crypto *tc;
148 struct cryptodesc *crdc;
149 struct cryptop *crp;
150 int hlen = IPCOMP_HLENGTH;
151
152 IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
153
154 /* Get crypto descriptors */
155 crp = crypto_getreq(1);
156 if (crp == NULL) {
157 m_freem(m);
158 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
159 ipcompstat.ipcomps_crypto++;
160 return ENOBUFS;
161 }
162 /* Get IPsec-specific opaque pointer */
163 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
164 if (tc == NULL) {
165 m_freem(m);
166 crypto_freereq(crp);
167 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
168 ipcompstat.ipcomps_crypto++;
169 return ENOBUFS;
170 }
171 crdc = crp->crp_desc;
172
173 crdc->crd_skip = skip + hlen;
174 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
175 crdc->crd_inject = skip;
176
177 tc->tc_ptr = 0;
178
179 /* Decompression operation */
180 crdc->crd_alg = sav->tdb_compalgxform->type;
181
182 /* Crypto operation descriptor */
183 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
184 crp->crp_flags = CRYPTO_F_IMBUF;
185 crp->crp_buf = (caddr_t) m;
186 crp->crp_callback = ipcomp_input_cb;
187 crp->crp_sid = sav->tdb_cryptoid;
188 crp->crp_opaque = (caddr_t) tc;
189
190 /* These are passed as-is to the callback */
191 tc->tc_spi = sav->spi;
192 tc->tc_dst = sav->sah->saidx.dst;
193 tc->tc_proto = sav->sah->saidx.proto;
194 tc->tc_protoff = protoff;
195 tc->tc_skip = skip;
196
197 return crypto_dispatch(crp);
198 }
199
200 #ifdef INET6
201 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
202 if (saidx->dst.sa.sa_family == AF_INET6) { \
203 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
204 } else { \
205 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
206 } \
207 } while (0)
208 #else
209 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
210 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
211 #endif
212
213 /*
214 * IPComp input callback from the crypto driver.
215 */
216 static int
217 ipcomp_input_cb(struct cryptop *crp)
218 {
219 struct cryptodesc *crd;
220 struct tdb_crypto *tc;
221 int skip, protoff;
222 struct mtag *mtag;
223 struct mbuf *m;
224 struct secasvar *sav;
225 struct secasindex *saidx;
226 int s, hlen = IPCOMP_HLENGTH, error, clen;
227 u_int8_t nproto;
228 caddr_t addr;
229
230 crd = crp->crp_desc;
231
232 tc = (struct tdb_crypto *) crp->crp_opaque;
233 IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
234 skip = tc->tc_skip;
235 protoff = tc->tc_protoff;
236 mtag = (struct mtag *) tc->tc_ptr;
237 m = (struct mbuf *) crp->crp_buf;
238
239 s = splsoftnet();
240
241 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
242 if (sav == NULL) {
243 ipcompstat.ipcomps_notdb++;
244 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
245 error = ENOBUFS; /*XXX*/
246 goto bad;
247 }
248
249 saidx = &sav->sah->saidx;
250 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
251 saidx->dst.sa.sa_family == AF_INET6,
252 ("ah_input_cb: unexpected protocol family %u",
253 saidx->dst.sa.sa_family));
254
255 /* Check for crypto errors */
256 if (crp->crp_etype) {
257 /* Reset the session ID */
258 if (sav->tdb_cryptoid != 0)
259 sav->tdb_cryptoid = crp->crp_sid;
260
261 if (crp->crp_etype == EAGAIN) {
262 KEY_FREESAV(&sav);
263 splx(s);
264 return crypto_dispatch(crp);
265 }
266
267 ipcompstat.ipcomps_noxform++;
268 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
269 error = crp->crp_etype;
270 goto bad;
271 }
272 /* Shouldn't happen... */
273 if (m == NULL) {
274 ipcompstat.ipcomps_crypto++;
275 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
276 error = EINVAL;
277 goto bad;
278 }
279 ipcompstat.ipcomps_hist[sav->alg_comp]++;
280
281 clen = crp->crp_olen; /* Length of data after processing */
282
283 /* Release the crypto descriptors */
284 free(tc, M_XDATA), tc = NULL;
285 crypto_freereq(crp), crp = NULL;
286
287 /* In case it's not done already, adjust the size of the mbuf chain */
288 m->m_pkthdr.len = clen + hlen + skip;
289
290 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
291 ipcompstat.ipcomps_hdrops++; /*XXX*/
292 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
293 error = EINVAL; /*XXX*/
294 goto bad;
295 }
296
297 /* Keep the next protocol field */
298 addr = (caddr_t) mtod(m, struct ip *) + skip;
299 nproto = ((struct ipcomp *) addr)->comp_nxt;
300 if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) {
301 ipcompstat.ipcomps_hdrops++;
302 DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n",
303 ipsec_address(&sav->sah->saidx.dst),
304 (u_long) ntohl(sav->spi)));
305 error = EINVAL;
306 goto bad;
307 }
308
309 /* Remove the IPCOMP header */
310 error = m_striphdr(m, skip, hlen);
311 if (error) {
312 ipcompstat.ipcomps_hdrops++;
313 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
314 ipsec_address(&sav->sah->saidx.dst),
315 (u_long) ntohl(sav->spi)));
316 goto bad;
317 }
318
319 /* Restore the Next Protocol field */
320 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
321
322 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
323
324 KEY_FREESAV(&sav);
325 splx(s);
326 return error;
327 bad:
328 if (sav)
329 KEY_FREESAV(&sav);
330 splx(s);
331 if (m)
332 m_freem(m);
333 if (tc != NULL)
334 free(tc, M_XDATA);
335 if (crp)
336 crypto_freereq(crp);
337 return error;
338 }
339
340 /*
341 * IPComp output routine, called by ipsec[46]_process_packet()
342 */
343 static int
344 ipcomp_output(
345 struct mbuf *m,
346 struct ipsecrequest *isr,
347 struct mbuf **mp,
348 int skip,
349 int protoff
350 )
351 {
352 struct secasvar *sav;
353 struct comp_algo *ipcompx;
354 int error, ralen, hlen, maxpacketsize;
355 struct cryptodesc *crdc;
356 struct cryptop *crp;
357 struct tdb_crypto *tc;
358
359 IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
360 sav = isr->sav;
361 IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
362 ipcompx = sav->tdb_compalgxform;
363 IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
364
365 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
366
367 /* Don't process the packet if it is too short */
368 if (ralen < ipcompx->minlen) {
369 ipcompstat.ipcomps_minlen++;
370 return ipsec_process_done(m,isr);
371 }
372
373 hlen = IPCOMP_HLENGTH;
374
375 ipcompstat.ipcomps_output++;
376
377 /* Check for maximum packet size violations. */
378 switch (sav->sah->saidx.dst.sa.sa_family) {
379 #ifdef INET
380 case AF_INET:
381 maxpacketsize = IP_MAXPACKET;
382 break;
383 #endif /* INET */
384 #ifdef INET6
385 case AF_INET6:
386 maxpacketsize = IPV6_MAXPACKET;
387 break;
388 #endif /* INET6 */
389 default:
390 ipcompstat.ipcomps_nopf++;
391 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
392 ", IPCA %s/%08lx\n",
393 sav->sah->saidx.dst.sa.sa_family,
394 ipsec_address(&sav->sah->saidx.dst),
395 (u_long) ntohl(sav->spi)));
396 error = EPFNOSUPPORT;
397 goto bad;
398 }
399 if (skip + hlen + ralen > maxpacketsize) {
400 ipcompstat.ipcomps_toobig++;
401 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
402 "(len %u, max len %u)\n",
403 ipsec_address(&sav->sah->saidx.dst),
404 (u_long) ntohl(sav->spi),
405 skip + hlen + ralen, maxpacketsize));
406 error = EMSGSIZE;
407 goto bad;
408 }
409
410 /* Update the counters */
411 ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
412
413 m = m_clone(m);
414 if (m == NULL) {
415 ipcompstat.ipcomps_hdrops++;
416 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
417 ipsec_address(&sav->sah->saidx.dst),
418 (u_long) ntohl(sav->spi)));
419 error = ENOBUFS;
420 goto bad;
421 }
422
423 /* Ok now, we can pass to the crypto processing */
424
425 /* Get crypto descriptors */
426 crp = crypto_getreq(1);
427 if (crp == NULL) {
428 ipcompstat.ipcomps_crypto++;
429 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
430 error = ENOBUFS;
431 goto bad;
432 }
433 crdc = crp->crp_desc;
434
435 /* Compression descriptor */
436 crdc->crd_skip = skip;
437 crdc->crd_len = m->m_pkthdr.len - skip;
438 crdc->crd_flags = CRD_F_COMP;
439 crdc->crd_inject = skip;
440
441 /* Compression operation */
442 crdc->crd_alg = ipcompx->type;
443
444 /* IPsec-specific opaque crypto info */
445 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
446 M_XDATA, M_NOWAIT|M_ZERO);
447 if (tc == NULL) {
448 ipcompstat.ipcomps_crypto++;
449 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
450 crypto_freereq(crp);
451 error = ENOBUFS;
452 goto bad;
453 }
454
455 tc->tc_isr = isr;
456 tc->tc_spi = sav->spi;
457 tc->tc_dst = sav->sah->saidx.dst;
458 tc->tc_proto = sav->sah->saidx.proto;
459 tc->tc_skip = skip + hlen;
460
461 /* Crypto operation descriptor */
462 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
463 crp->crp_flags = CRYPTO_F_IMBUF;
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);
470 bad:
471 if (m)
472 m_freem(m);
473 return (error);
474 }
475
476 /*
477 * IPComp output callback from the crypto driver.
478 */
479 static int
480 ipcomp_output_cb(struct cryptop *crp)
481 {
482 struct tdb_crypto *tc;
483 struct ipsecrequest *isr;
484 struct secasvar *sav;
485 struct mbuf *m, *mo;
486 int s, error, skip, rlen, roff;
487 u_int8_t prot;
488 u_int16_t cpi;
489 struct ipcomp * ipcomp;
490
491
492 tc = (struct tdb_crypto *) crp->crp_opaque;
493 IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
494 m = (struct mbuf *) crp->crp_buf;
495 skip = tc->tc_skip;
496 rlen = crp->crp_ilen - skip;
497
498 s = splsoftnet();
499
500 isr = tc->tc_isr;
501 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
502 if (sav == NULL) {
503 ipcompstat.ipcomps_notdb++;
504 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
505 error = ENOBUFS; /*XXX*/
506 goto bad;
507 }
508 IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
509
510 /* Check for crypto errors */
511 if (crp->crp_etype) {
512 /* Reset session ID */
513 if (sav->tdb_cryptoid != 0)
514 sav->tdb_cryptoid = crp->crp_sid;
515
516 if (crp->crp_etype == EAGAIN) {
517 KEY_FREESAV(&sav);
518 splx(s);
519 return crypto_dispatch(crp);
520 }
521 ipcompstat.ipcomps_noxform++;
522 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
523 error = crp->crp_etype;
524 goto bad;
525 }
526 /* Shouldn't happen... */
527 if (m == NULL) {
528 ipcompstat.ipcomps_crypto++;
529 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
530 error = EINVAL;
531 goto bad;
532 }
533 ipcompstat.ipcomps_hist[sav->alg_comp]++;
534
535 if (rlen > crp->crp_olen) {
536 /* Inject IPCOMP header */
537 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
538 if (mo == NULL) {
539 ipcompstat.ipcomps_wrap++;
540 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
541 "IPCA %s/%08lx\n",
542 ipsec_address(&sav->sah->saidx.dst),
543 (u_long) ntohl(sav->spi)));
544 error = ENOBUFS;
545 goto bad;
546 }
547 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
548
549 /* Initialize the IPCOMP header */
550 /* XXX alignment always correct? */
551 switch (sav->sah->saidx.dst.sa.sa_family) {
552 #ifdef INET
553 case AF_INET:
554 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
555 break;
556 #endif /* INET */
557 #ifdef INET6
558 case AF_INET6:
559 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
560 break;
561 #endif
562 }
563 ipcomp->comp_flags = 0;
564
565 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
566 cpi = sav->alg_enc;
567 else
568 cpi = ntohl(sav->spi) & 0xffff;
569 ipcomp->comp_cpi = htons(cpi);
570
571 /* Fix Next Protocol in IPv4/IPv6 header */
572 prot = IPPROTO_IPCOMP;
573 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot);
574
575 /* Adjust the length in the IP header */
576 switch (sav->sah->saidx.dst.sa.sa_family) {
577 #ifdef INET
578 case AF_INET:
579 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
580 break;
581 #endif /* INET */
582 #ifdef INET6
583 case AF_INET6:
584 mtod(m, struct ip6_hdr *)->ip6_plen =
585 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
586 break;
587 #endif /* INET6 */
588 default:
589 ipcompstat.ipcomps_nopf++;
590 DPRINTF(("ipcomp_output: unknown/unsupported protocol "
591 "family %d, IPCA %s/%08lx\n",
592 sav->sah->saidx.dst.sa.sa_family,
593 ipsec_address(&sav->sah->saidx.dst),
594 (u_long) ntohl(sav->spi)));
595 error = EPFNOSUPPORT;
596 goto bad;
597 }
598 } else {
599 /* compression was useless, we have lost time */
600 /* XXX add statistic */
601 }
602
603 /* Release the crypto descriptor */
604 free(tc, M_XDATA);
605 crypto_freereq(crp);
606
607 /* NB: m is reclaimed by ipsec_process_done. */
608 error = ipsec_process_done(m, isr);
609 KEY_FREESAV(&sav);
610 splx(s);
611 return error;
612 bad:
613 if (sav)
614 KEY_FREESAV(&sav);
615 splx(s);
616 if (m)
617 m_freem(m);
618 free(tc, M_XDATA);
619 crypto_freereq(crp);
620 return error;
621 }
622
623 static struct xformsw ipcomp_xformsw = {
624 XF_IPCOMP, XFT_COMP, "IPcomp",
625 ipcomp_init, ipcomp_zeroize, ipcomp_input,
626 ipcomp_output,
627 NULL,
628 };
629
630 INITFN void
631 ipcomp_attach(void)
632 {
633 xform_register(&ipcomp_xformsw);
634 }
635
636 #ifdef __FreeBSD__
637 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
638 #endif /* __FreeBSD__ */
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