1 /* $NetBSD: xform_ipcomp.c,v 1.18.12.1 2011/04/03 06:08:35 jdc 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 1.18.12.1 2011/04/03 06:08:35 jdc 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/ipsec_private.h>
57 #include <netipsec/xform.h>
58
59 #ifdef INET6
60 #include <netinet/ip6.h>
61 #include <netipsec/ipsec6.h>
62 #endif
63
64 #include <netipsec/ipcomp.h>
65 #include <netipsec/ipcomp_var.h>
66
67 #include <netipsec/key.h>
68 #include <netipsec/key_debug.h>
69
70 #include <netipsec/ipsec_osdep.h>
71
72 #include <opencrypto/cryptodev.h>
73 #include <opencrypto/deflate.h>
74 #include <opencrypto/xform.h>
75
76 percpu_t *ipcompstat_percpu;
77
78 int ipcomp_enable = 1;
79
80 #ifdef __FreeBSD__
81 SYSCTL_DECL(_net_inet_ipcomp);
82 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
83 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, "");
84 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
85 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, "");
86 #endif /* __FreeBSD__ */
87
88 static int ipcomp_input_cb(struct cryptop *crp);
89 static int ipcomp_output_cb(struct cryptop *crp);
90
91 struct comp_algo *
92 ipcomp_algorithm_lookup(int alg)
93 {
94 if (alg >= IPCOMP_ALG_MAX)
95 return NULL;
96 switch (alg) {
97 case SADB_X_CALG_DEFLATE:
98 return &comp_algo_deflate;
99 }
100 return NULL;
101 }
102
103 /*
104 * ipcomp_init() is called when an CPI is being set up.
105 */
106 static int
107 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
108 {
109 struct comp_algo *tcomp;
110 struct cryptoini cric;
111 int ses;
112
113 /* NB: algorithm really comes in alg_enc and not alg_comp! */
114 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
115 if (tcomp == NULL) {
116 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
117 sav->alg_comp));
118 return EINVAL;
119 }
120 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
121 sav->tdb_xform = xsp;
122 sav->tdb_compalgxform = tcomp;
123
124 /* Initialize crypto session */
125 bzero(&cric, sizeof (cric));
126 cric.cri_alg = sav->tdb_compalgxform->type;
127
128 mutex_spin_enter(&crypto_mtx);
129 ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
130 mutex_spin_exit(&crypto_mtx);
131 return ses;
132 }
133
134 /*
135 * ipcomp_zeroize() used when IPCA is deleted
136 */
137 static int
138 ipcomp_zeroize(struct secasvar *sav)
139 {
140 int err;
141
142 mutex_spin_enter(&crypto_mtx);
143 err = crypto_freesession(sav->tdb_cryptoid);
144 mutex_spin_exit(&crypto_mtx);
145 sav->tdb_cryptoid = 0;
146 return err;
147 }
148
149 /*
150 * ipcomp_input() gets called to uncompress an input packet
151 */
152 static int
153 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
154 {
155 struct tdb_crypto *tc;
156 struct cryptodesc *crdc;
157 struct cryptop *crp;
158 int hlen = IPCOMP_HLENGTH;
159
160 IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
161
162 /* Get crypto descriptors */
163 crp = crypto_getreq(1);
164 if (crp == NULL) {
165 m_freem(m);
166 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
167 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
168 return ENOBUFS;
169 }
170 /* Get IPsec-specific opaque pointer */
171 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
172 if (tc == NULL) {
173 m_freem(m);
174 crypto_freereq(crp);
175 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
176 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
177 return ENOBUFS;
178 }
179 crdc = crp->crp_desc;
180
181 crdc->crd_skip = skip + hlen;
182 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
183 crdc->crd_inject = skip;
184
185 tc->tc_ptr = 0;
186
187 /* Decompression operation */
188 crdc->crd_alg = sav->tdb_compalgxform->type;
189
190 /* Crypto operation descriptor */
191 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
192 crp->crp_flags = CRYPTO_F_IMBUF;
193 crp->crp_buf = m;
194 crp->crp_callback = ipcomp_input_cb;
195 crp->crp_sid = sav->tdb_cryptoid;
196 crp->crp_opaque = tc;
197
198 /* These are passed as-is to the callback */
199 tc->tc_spi = sav->spi;
200 tc->tc_dst = sav->sah->saidx.dst;
201 tc->tc_proto = sav->sah->saidx.proto;
202 tc->tc_protoff = protoff;
203 tc->tc_skip = skip;
204
205 return crypto_dispatch(crp);
206 }
207
208 #ifdef INET6
209 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
210 if (saidx->dst.sa.sa_family == AF_INET6) { \
211 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
212 } else { \
213 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
214 } \
215 } while (0)
216 #else
217 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
218 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
219 #endif
220
221 /*
222 * IPComp input callback from the crypto driver.
223 */
224 static int
225 ipcomp_input_cb(struct cryptop *crp)
226 {
227 struct cryptodesc *crd;
228 struct tdb_crypto *tc;
229 int skip, protoff;
230 struct mtag *mtag;
231 struct mbuf *m;
232 struct secasvar *sav;
233 struct secasindex *saidx;
234 int s, hlen = IPCOMP_HLENGTH, error, clen;
235 u_int8_t nproto;
236 void *addr;
237 u_int16_t dport = 0;
238 u_int16_t sport = 0;
239 #ifdef IPSEC_NAT_T
240 struct m_tag * tag = NULL;
241 #endif
242
243 crd = crp->crp_desc;
244
245 tc = (struct tdb_crypto *) crp->crp_opaque;
246 IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
247 skip = tc->tc_skip;
248 protoff = tc->tc_protoff;
249 mtag = (struct mtag *) tc->tc_ptr;
250 m = (struct mbuf *) crp->crp_buf;
251
252 #ifdef IPSEC_NAT_T
253 /* find the source port for NAT-T */
254 if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) {
255 sport = ((u_int16_t *)(tag + 1))[0];
256 dport = ((u_int16_t *)(tag + 1))[1];
257 }
258 #endif
259
260 s = splsoftnet();
261
262 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport);
263 if (sav == NULL) {
264 IPCOMP_STATINC(IPCOMP_STAT_NOTDB);
265 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
266 error = ENOBUFS; /*XXX*/
267 goto bad;
268 }
269
270 saidx = &sav->sah->saidx;
271 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
272 saidx->dst.sa.sa_family == AF_INET6,
273 ("ah_input_cb: unexpected protocol family %u",
274 saidx->dst.sa.sa_family));
275
276 /* Check for crypto errors */
277 if (crp->crp_etype) {
278 /* Reset the session ID */
279 if (sav->tdb_cryptoid != 0)
280 sav->tdb_cryptoid = crp->crp_sid;
281
282 if (crp->crp_etype == EAGAIN) {
283 KEY_FREESAV(&sav);
284 splx(s);
285 return crypto_dispatch(crp);
286 }
287
288 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM);
289 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
290 error = crp->crp_etype;
291 goto bad;
292 }
293 /* Shouldn't happen... */
294 if (m == NULL) {
295 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
296 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
297 error = EINVAL;
298 goto bad;
299 }
300 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp);
301
302 clen = crp->crp_olen; /* Length of data after processing */
303
304 /* Release the crypto descriptors */
305 free(tc, M_XDATA), tc = NULL;
306 crypto_freereq(crp), crp = NULL;
307
308 /* In case it's not done already, adjust the size of the mbuf chain */
309 m->m_pkthdr.len = clen + hlen + skip;
310
311 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
312 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/
313 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
314 error = EINVAL; /*XXX*/
315 goto bad;
316 }
317
318 /* Keep the next protocol field */
319 addr = (uint8_t*) mtod(m, struct ip *) + skip;
320 nproto = ((struct ipcomp *) addr)->comp_nxt;
321 if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) {
322 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
323 DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n",
324 ipsec_address(&sav->sah->saidx.dst),
325 (u_long) ntohl(sav->spi)));
326 error = EINVAL;
327 goto bad;
328 }
329
330 /* Remove the IPCOMP header */
331 error = m_striphdr(m, skip, hlen);
332 if (error) {
333 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
334 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
335 ipsec_address(&sav->sah->saidx.dst),
336 (u_long) ntohl(sav->spi)));
337 goto bad;
338 }
339
340 /* Restore the Next Protocol field */
341 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
342
343 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
344
345 KEY_FREESAV(&sav);
346 splx(s);
347 return error;
348 bad:
349 if (sav)
350 KEY_FREESAV(&sav);
351 splx(s);
352 if (m)
353 m_freem(m);
354 if (tc != NULL)
355 free(tc, M_XDATA);
356 if (crp)
357 crypto_freereq(crp);
358 return error;
359 }
360
361 /*
362 * IPComp output routine, called by ipsec[46]_process_packet()
363 */
364 static int
365 ipcomp_output(
366 struct mbuf *m,
367 struct ipsecrequest *isr,
368 struct mbuf **mp,
369 int skip,
370 int protoff
371 )
372 {
373 struct secasvar *sav;
374 struct comp_algo *ipcompx;
375 int error, ralen, hlen, maxpacketsize;
376 struct cryptodesc *crdc;
377 struct cryptop *crp;
378 struct tdb_crypto *tc;
379
380 IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
381 sav = isr->sav;
382 IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
383 ipcompx = sav->tdb_compalgxform;
384 IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
385
386 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
387
388 /* Don't process the packet if it is too short */
389 if (ralen < ipcompx->minlen) {
390 IPCOMP_STATINC(IPCOMP_STAT_MINLEN);
391 return ipsec_process_done(m,isr);
392 }
393
394 hlen = IPCOMP_HLENGTH;
395
396 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT);
397
398 /* Check for maximum packet size violations. */
399 switch (sav->sah->saidx.dst.sa.sa_family) {
400 #ifdef INET
401 case AF_INET:
402 maxpacketsize = IP_MAXPACKET;
403 break;
404 #endif /* INET */
405 #ifdef INET6
406 case AF_INET6:
407 maxpacketsize = IPV6_MAXPACKET;
408 break;
409 #endif /* INET6 */
410 default:
411 IPCOMP_STATINC(IPCOMP_STAT_NOPF);
412 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
413 ", IPCA %s/%08lx\n",
414 sav->sah->saidx.dst.sa.sa_family,
415 ipsec_address(&sav->sah->saidx.dst),
416 (u_long) ntohl(sav->spi)));
417 error = EPFNOSUPPORT;
418 goto bad;
419 }
420 if (skip + hlen + ralen > maxpacketsize) {
421 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG);
422 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
423 "(len %u, max len %u)\n",
424 ipsec_address(&sav->sah->saidx.dst),
425 (u_long) ntohl(sav->spi),
426 skip + hlen + ralen, maxpacketsize));
427 error = EMSGSIZE;
428 goto bad;
429 }
430
431 /* Update the counters */
432 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip);
433
434 m = m_clone(m);
435 if (m == NULL) {
436 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
437 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
438 ipsec_address(&sav->sah->saidx.dst),
439 (u_long) ntohl(sav->spi)));
440 error = ENOBUFS;
441 goto bad;
442 }
443
444 /* Ok now, we can pass to the crypto processing */
445
446 /* Get crypto descriptors */
447 crp = crypto_getreq(1);
448 if (crp == NULL) {
449 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
450 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
451 error = ENOBUFS;
452 goto bad;
453 }
454 crdc = crp->crp_desc;
455
456 /* Compression descriptor */
457 crdc->crd_skip = skip;
458 crdc->crd_len = m->m_pkthdr.len - skip;
459 crdc->crd_flags = CRD_F_COMP;
460 crdc->crd_inject = skip;
461
462 /* Compression operation */
463 crdc->crd_alg = ipcompx->type;
464
465 /* IPsec-specific opaque crypto info */
466 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
467 M_XDATA, M_NOWAIT|M_ZERO);
468 if (tc == NULL) {
469 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
470 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
471 crypto_freereq(crp);
472 error = ENOBUFS;
473 goto bad;
474 }
475
476 tc->tc_isr = isr;
477 tc->tc_spi = sav->spi;
478 tc->tc_dst = sav->sah->saidx.dst;
479 tc->tc_proto = sav->sah->saidx.proto;
480 tc->tc_skip = skip;
481 tc->tc_protoff = protoff;
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 = m;
487 crp->crp_callback = ipcomp_output_cb;
488 crp->crp_opaque = 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, *mo;
508 int s, error, skip, rlen, roff;
509 u_int8_t prot;
510 u_int16_t cpi;
511 struct ipcomp * ipcomp;
512
513
514 tc = (struct tdb_crypto *) crp->crp_opaque;
515 IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
516 m = (struct mbuf *) crp->crp_buf;
517 skip = tc->tc_skip;
518 rlen = crp->crp_ilen - skip;
519
520 s = splsoftnet();
521
522 isr = tc->tc_isr;
523 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0);
524 if (sav == NULL) {
525 IPCOMP_STATINC(IPCOMP_STAT_NOTDB);
526 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
527 error = ENOBUFS; /*XXX*/
528 goto bad;
529 }
530 IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
531
532 /* Check for crypto errors */
533 if (crp->crp_etype) {
534 /* Reset session ID */
535 if (sav->tdb_cryptoid != 0)
536 sav->tdb_cryptoid = crp->crp_sid;
537
538 if (crp->crp_etype == EAGAIN) {
539 KEY_FREESAV(&sav);
540 splx(s);
541 return crypto_dispatch(crp);
542 }
543 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM);
544 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
545 error = crp->crp_etype;
546 goto bad;
547 }
548 /* Shouldn't happen... */
549 if (m == NULL) {
550 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
551 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
552 error = EINVAL;
553 goto bad;
554 }
555 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp);
556
557 if (rlen > crp->crp_olen) {
558 /* Inject IPCOMP header */
559 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
560 if (mo == NULL) {
561 IPCOMP_STATINC(IPCOMP_STAT_WRAP);
562 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
563 "IPCA %s/%08lx\n",
564 ipsec_address(&sav->sah->saidx.dst),
565 (u_long) ntohl(sav->spi)));
566 error = ENOBUFS;
567 goto bad;
568 }
569 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff);
570
571 /* Initialize the IPCOMP header */
572 /* XXX alignment always correct? */
573 switch (sav->sah->saidx.dst.sa.sa_family) {
574 #ifdef INET
575 case AF_INET:
576 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
577 break;
578 #endif /* INET */
579 #ifdef INET6
580 case AF_INET6:
581 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
582 break;
583 #endif
584 }
585 ipcomp->comp_flags = 0;
586
587 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
588 cpi = sav->alg_enc;
589 else
590 cpi = ntohl(sav->spi) & 0xffff;
591 ipcomp->comp_cpi = htons(cpi);
592
593 /* Fix Next Protocol in IPv4/IPv6 header */
594 prot = IPPROTO_IPCOMP;
595 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot);
596
597 /* Adjust the length in the IP header */
598 switch (sav->sah->saidx.dst.sa.sa_family) {
599 #ifdef INET
600 case AF_INET:
601 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
602 break;
603 #endif /* INET */
604 #ifdef INET6
605 case AF_INET6:
606 mtod(m, struct ip6_hdr *)->ip6_plen =
607 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
608 break;
609 #endif /* INET6 */
610 default:
611 IPCOMP_STATINC(IPCOMP_STAT_NOPF);
612 DPRINTF(("ipcomp_output: unknown/unsupported protocol "
613 "family %d, IPCA %s/%08lx\n",
614 sav->sah->saidx.dst.sa.sa_family,
615 ipsec_address(&sav->sah->saidx.dst),
616 (u_long) ntohl(sav->spi)));
617 error = EPFNOSUPPORT;
618 goto bad;
619 }
620 } else {
621 /* compression was useless, we have lost time */
622 IPCOMP_STATINC(IPCOMP_STAT_USELESS);
623 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d"
624 "and compressed size is %d\n", rlen, crp->crp_olen));
625 }
626
627
628 /* Release the crypto descriptor */
629 free(tc, M_XDATA);
630 crypto_freereq(crp);
631
632 /* NB: m is reclaimed by ipsec_process_done. */
633 error = ipsec_process_done(m, isr);
634 KEY_FREESAV(&sav);
635 splx(s);
636 return error;
637 bad:
638 if (sav)
639 KEY_FREESAV(&sav);
640 splx(s);
641 if (m)
642 m_freem(m);
643 free(tc, M_XDATA);
644 crypto_freereq(crp);
645 return error;
646 }
647
648 static struct xformsw ipcomp_xformsw = {
649 XF_IPCOMP, XFT_COMP, "IPcomp",
650 ipcomp_init, ipcomp_zeroize, ipcomp_input,
651 ipcomp_output,
652 NULL,
653 };
654
655 INITFN void
656 ipcomp_attach(void)
657 {
658 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS);
659 xform_register(&ipcomp_xformsw);
660 }
661
662 #ifdef __FreeBSD__
663 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
664 #endif /* __FreeBSD__ */
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