Annotation of src/sys/netipsec/xform_ipcomp.c, Revision 1.5
1.5 ! perry 1: /* $NetBSD: xform_ipcomp.c,v 1.4 2003/10/06 22:05:15 tls Exp $ */
1.1 jonathan 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>
1.5 ! perry 33: __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.4 2003/10/06 22:05:15 tls Exp $");
1.1 jonathan 34:
35: /* IP payload compression protocol (IPComp), see RFC 2393 */
36: #include "opt_inet.h"
1.2 jonathan 37: #ifdef __FreeBSD__
1.1 jonathan 38: #include "opt_inet6.h"
1.2 jonathan 39: #endif
1.1 jonathan 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:
1.4 tls 66: #include <netipsec/key.h>
67: #include <netipsec/key_debug.h>
1.1 jonathan 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 = 0;
76: struct ipcompstat ipcompstat;
77:
1.4 tls 78: #ifdef __FreeBSD__
1.1 jonathan 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, "");
1.4 tls 84: #endif /* __FreeBSD__ */
1.1 jonathan 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:
301: /* Remove the IPCOMP header */
302: error = m_striphdr(m, skip, hlen);
303: if (error) {
304: ipcompstat.ipcomps_hdrops++;
305: DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
306: ipsec_address(&sav->sah->saidx.dst),
307: (u_long) ntohl(sav->spi)));
308: goto bad;
309: }
310:
311: /* Restore the Next Protocol field */
312: m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
313:
314: IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
315:
316: KEY_FREESAV(&sav);
317: splx(s);
318: return error;
319: bad:
320: if (sav)
321: KEY_FREESAV(&sav);
322: splx(s);
323: if (m)
324: m_freem(m);
325: if (tc != NULL)
326: free(tc, M_XDATA);
327: if (crp)
328: crypto_freereq(crp);
329: return error;
330: }
331:
332: /*
333: * IPComp output routine, called by ipsec[46]_process_packet()
334: */
335: static int
336: ipcomp_output(
337: struct mbuf *m,
338: struct ipsecrequest *isr,
339: struct mbuf **mp,
340: int skip,
341: int protoff
342: )
343: {
344: struct secasvar *sav;
345: struct comp_algo *ipcompx;
346: int error, ralen, hlen, maxpacketsize, roff;
347: u_int8_t prot;
348: struct cryptodesc *crdc;
349: struct cryptop *crp;
350: struct tdb_crypto *tc;
351: struct mbuf *mo;
352: struct ipcomp *ipcomp;
353:
354: IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
355: sav = isr->sav;
356: IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
357: ipcompx = sav->tdb_compalgxform;
358: IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
359:
360: ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
361: hlen = IPCOMP_HLENGTH;
362:
363: ipcompstat.ipcomps_output++;
364:
365: /* Check for maximum packet size violations. */
366: switch (sav->sah->saidx.dst.sa.sa_family) {
367: #ifdef INET
368: case AF_INET:
369: maxpacketsize = IP_MAXPACKET;
370: break;
371: #endif /* INET */
372: #ifdef INET6
373: case AF_INET6:
374: maxpacketsize = IPV6_MAXPACKET;
375: break;
376: #endif /* INET6 */
377: default:
378: ipcompstat.ipcomps_nopf++;
379: DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
1.5 ! perry 380: ", IPCA %s/%08lx\n",
1.1 jonathan 381: sav->sah->saidx.dst.sa.sa_family,
382: ipsec_address(&sav->sah->saidx.dst),
383: (u_long) ntohl(sav->spi)));
384: error = EPFNOSUPPORT;
385: goto bad;
386: }
387: if (skip + hlen + ralen > maxpacketsize) {
388: ipcompstat.ipcomps_toobig++;
389: DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
390: "(len %u, max len %u)\n",
391: ipsec_address(&sav->sah->saidx.dst),
392: (u_long) ntohl(sav->spi),
393: skip + hlen + ralen, maxpacketsize));
394: error = EMSGSIZE;
395: goto bad;
396: }
397:
398: /* Update the counters */
399: ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
400:
401: m = m_clone(m);
402: if (m == NULL) {
403: ipcompstat.ipcomps_hdrops++;
1.5 ! perry 404: DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
1.1 jonathan 405: ipsec_address(&sav->sah->saidx.dst),
406: (u_long) ntohl(sav->spi)));
407: error = ENOBUFS;
408: goto bad;
409: }
410:
411: /* Inject IPCOMP header */
412: mo = m_makespace(m, skip, hlen, &roff);
413: if (mo == NULL) {
414: ipcompstat.ipcomps_wrap++;
415: DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
416: "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: ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
423:
424: /* Initialize the IPCOMP header */
425: /* XXX alignment always correct? */
426: switch (sav->sah->saidx.dst.sa.sa_family) {
427: #ifdef INET
428: case AF_INET:
429: ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
430: break;
431: #endif /* INET */
432: #ifdef INET6
433: case AF_INET6:
434: ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
435: break;
436: #endif
437: }
438: ipcomp->comp_flags = 0;
439: ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
440:
441: /* Fix Next Protocol in IPv4/IPv6 header */
442: prot = IPPROTO_IPCOMP;
443: m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
444:
445: /* Ok now, we can pass to the crypto processing */
446:
447: /* Get crypto descriptors */
448: crp = crypto_getreq(1);
449: if (crp == NULL) {
450: ipcompstat.ipcomps_crypto++;
451: DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
452: error = ENOBUFS;
453: goto bad;
454: }
455: crdc = crp->crp_desc;
456:
457: /* Compression descriptor */
458: crdc->crd_skip = skip + hlen;
459: crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
460: crdc->crd_flags = CRD_F_COMP;
461: crdc->crd_inject = skip + hlen;
462:
463: /* Compression operation */
464: crdc->crd_alg = ipcompx->type;
465:
466: /* IPsec-specific opaque crypto info */
467: tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
468: M_XDATA, M_NOWAIT|M_ZERO);
469: if (tc == NULL) {
470: ipcompstat.ipcomps_crypto++;
471: DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
472: crypto_freereq(crp);
473: error = ENOBUFS;
474: goto bad;
475: }
476:
477: tc->tc_isr = isr;
478: tc->tc_spi = sav->spi;
479: tc->tc_dst = sav->sah->saidx.dst;
480: tc->tc_proto = sav->sah->saidx.proto;
481: tc->tc_skip = skip + hlen;
482:
483: /* Crypto operation descriptor */
484: crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
485: crp->crp_flags = CRYPTO_F_IMBUF;
486: crp->crp_buf = (caddr_t) m;
487: crp->crp_callback = ipcomp_output_cb;
488: crp->crp_opaque = (caddr_t) tc;
489: crp->crp_sid = sav->tdb_cryptoid;
490:
491: return crypto_dispatch(crp);
492: bad:
493: if (m)
494: m_freem(m);
495: return (error);
496: }
497:
498: /*
499: * IPComp output callback from the crypto driver.
500: */
501: static int
502: ipcomp_output_cb(struct cryptop *crp)
503: {
504: struct tdb_crypto *tc;
505: struct ipsecrequest *isr;
506: struct secasvar *sav;
507: struct mbuf *m;
508: int s, error, skip, rlen;
509:
510: tc = (struct tdb_crypto *) crp->crp_opaque;
511: IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
512: m = (struct mbuf *) crp->crp_buf;
513: skip = tc->tc_skip;
514: rlen = crp->crp_ilen - skip;
515:
516: s = splsoftnet();
517:
518: isr = tc->tc_isr;
519: sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
520: if (sav == NULL) {
521: ipcompstat.ipcomps_notdb++;
522: DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
523: error = ENOBUFS; /*XXX*/
524: goto bad;
525: }
526: IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
527:
528: /* Check for crypto errors */
529: if (crp->crp_etype) {
530: /* Reset session ID */
531: if (sav->tdb_cryptoid != 0)
532: sav->tdb_cryptoid = crp->crp_sid;
533:
534: if (crp->crp_etype == EAGAIN) {
535: KEY_FREESAV(&sav);
536: splx(s);
537: return crypto_dispatch(crp);
538: }
539: ipcompstat.ipcomps_noxform++;
540: DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
541: error = crp->crp_etype;
542: goto bad;
543: }
544: /* Shouldn't happen... */
545: if (m == NULL) {
546: ipcompstat.ipcomps_crypto++;
547: DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
548: error = EINVAL;
549: goto bad;
550: }
551: ipcompstat.ipcomps_hist[sav->alg_comp]++;
552:
553: if (rlen > crp->crp_olen) {
554: /* Adjust the length in the IP header */
555: switch (sav->sah->saidx.dst.sa.sa_family) {
556: #ifdef INET
557: case AF_INET:
558: mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
559: break;
560: #endif /* INET */
561: #ifdef INET6
562: case AF_INET6:
563: mtod(m, struct ip6_hdr *)->ip6_plen =
564: htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
565: break;
566: #endif /* INET6 */
567: default:
568: ipcompstat.ipcomps_nopf++;
569: DPRINTF(("ipcomp_output: unknown/unsupported protocol "
1.5 ! perry 570: "family %d, IPCA %s/%08lx\n",
1.1 jonathan 571: sav->sah->saidx.dst.sa.sa_family,
1.5 ! perry 572: ipsec_address(&sav->sah->saidx.dst),
1.1 jonathan 573: (u_long) ntohl(sav->spi)));
574: error = EPFNOSUPPORT;
575: goto bad;
576: }
577: } else {
578: /* compression was useless, we have lost time */
579: /* XXX add statistic */
580: }
581:
582: /* Release the crypto descriptor */
583: free(tc, M_XDATA);
584: crypto_freereq(crp);
585:
586: /* NB: m is reclaimed by ipsec_process_done. */
587: error = ipsec_process_done(m, isr);
588: KEY_FREESAV(&sav);
589: splx(s);
590: return error;
591: bad:
592: if (sav)
593: KEY_FREESAV(&sav);
594: splx(s);
595: if (m)
596: m_freem(m);
597: free(tc, M_XDATA);
598: crypto_freereq(crp);
599: return error;
600: }
601:
602: static struct xformsw ipcomp_xformsw = {
603: XF_IPCOMP, XFT_COMP, "IPcomp",
604: ipcomp_init, ipcomp_zeroize, ipcomp_input,
605: ipcomp_output
606: };
607:
608: INITFN void
609: ipcomp_attach(void)
610: {
611: xform_register(&ipcomp_xformsw);
612: }
613:
614: #ifdef __FreeBSD__
615: SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
1.4 tls 616: #endif /* __FreeBSD__ */
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