1 /* $NetBSD: xform_ipcomp.c,v 1.31 2013/11/03 18:37:10 mrg 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 1.31 2013/11/03 18:37:10 mrg 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 #include <sys/socketvar.h> /* for softnet_lock */
49
50 #include <netinet/in.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <netinet/ip_var.h>
54
55 #include <net/route.h>
56 #include <netipsec/ipsec.h>
57 #include <netipsec/ipsec_private.h>
58 #include <netipsec/xform.h>
59
60 #ifdef INET6
61 #include <netinet/ip6.h>
62 #include <netipsec/ipsec6.h>
63 #endif
64
65 #include <netipsec/ipcomp.h>
66 #include <netipsec/ipcomp_var.h>
67
68 #include <netipsec/key.h>
69 #include <netipsec/key_debug.h>
70
71 #include <netipsec/ipsec_osdep.h>
72
73 #include <opencrypto/cryptodev.h>
74 #include <opencrypto/deflate.h>
75 #include <opencrypto/xform.h>
76
77 percpu_t *ipcompstat_percpu;
78
79 int ipcomp_enable = 1;
80
81 #ifdef __FreeBSD__
82 SYSCTL_DECL(_net_inet_ipcomp);
83 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
84 ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, "");
85 SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
86 stats, CTLFLAG_RD, &ipcompstat, ipcompstat, "");
87 #endif /* __FreeBSD__ */
88
89 static int ipcomp_input_cb(struct cryptop *crp);
90 static int ipcomp_output_cb(struct cryptop *crp);
91
92 const struct comp_algo *
ipcomp_algorithm_lookup(int alg)93 ipcomp_algorithm_lookup(int alg)
94 {
95 if (alg >= IPCOMP_ALG_MAX)
96 return NULL;
97 switch (alg) {
98 case SADB_X_CALG_DEFLATE:
99 return &comp_algo_deflate_nogrow;
100 }
101 return NULL;
102 }
103
104 /*
105 * ipcomp_init() is called when an CPI is being set up.
106 */
107 static int
ipcomp_init(struct secasvar * sav,const struct xformsw * xsp)108 ipcomp_init(struct secasvar *sav, const struct xformsw *xsp)
109 {
110 const struct comp_algo *tcomp;
111 struct cryptoini cric;
112 int ses;
113
114 /* NB: algorithm really comes in alg_enc and not alg_comp! */
115 tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
116 if (tcomp == NULL) {
117 DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
118 sav->alg_comp));
119 return EINVAL;
120 }
121 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
122 sav->tdb_xform = xsp;
123 sav->tdb_compalgxform = tcomp;
124
125 /* Initialize crypto session */
126 memset(&cric, 0, sizeof (cric));
127 cric.cri_alg = sav->tdb_compalgxform->type;
128
129 ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
130 return ses;
131 }
132
133 /*
134 * ipcomp_zeroize() used when IPCA is deleted
135 */
136 static int
ipcomp_zeroize(struct secasvar * sav)137 ipcomp_zeroize(struct secasvar *sav)
138 {
139 int err;
140
141 err = crypto_freesession(sav->tdb_cryptoid);
142 sav->tdb_cryptoid = 0;
143 return err;
144 }
145
146 /*
147 * ipcomp_input() gets called to uncompress an input packet
148 */
149 static int
ipcomp_input(struct mbuf * m,const struct secasvar * sav,int skip,int protoff)150 ipcomp_input(struct mbuf *m, const struct secasvar *sav, int skip, int protoff)
151 {
152 struct tdb_crypto *tc;
153 struct cryptodesc *crdc;
154 struct cryptop *crp;
155 int error, hlen = IPCOMP_HLENGTH;
156
157 IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
158
159 /* Get crypto descriptors */
160 crp = crypto_getreq(1);
161 if (crp == NULL) {
162 m_freem(m);
163 DPRINTF(("ipcomp_input: no crypto descriptors\n"));
164 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
165 return ENOBUFS;
166 }
167 /* Get IPsec-specific opaque pointer */
168 tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
169 if (tc == NULL) {
170 m_freem(m);
171 crypto_freereq(crp);
172 DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
173 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
174 return ENOBUFS;
175 }
176
177 error = m_makewritable(&m, 0, m->m_pkthdr.len, M_NOWAIT);
178 if (error) {
179 DPRINTF(("ipcomp_input: m_makewritable failed\n"));
180 m_freem(m);
181 free(tc, M_XDATA);
182 crypto_freereq(crp);
183 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
184 return error;
185 }
186
187 crdc = crp->crp_desc;
188
189 crdc->crd_skip = skip + hlen;
190 crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
191 crdc->crd_inject = 0; /* unused */
192
193 tc->tc_ptr = 0;
194
195 /* Decompression operation */
196 crdc->crd_alg = sav->tdb_compalgxform->type;
197
198 /* Crypto operation descriptor */
199 crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
200 crp->crp_olen = MCLBYTES; /* hint to decompression code */
201 crp->crp_flags = CRYPTO_F_IMBUF;
202 crp->crp_buf = m;
203 crp->crp_callback = ipcomp_input_cb;
204 crp->crp_sid = sav->tdb_cryptoid;
205 crp->crp_opaque = tc;
206
207 /* These are passed as-is to the callback */
208 tc->tc_spi = sav->spi;
209 tc->tc_dst = sav->sah->saidx.dst;
210 tc->tc_proto = sav->sah->saidx.proto;
211 tc->tc_protoff = protoff;
212 tc->tc_skip = skip;
213
214 return crypto_dispatch(crp);
215 }
216
217 #ifdef INET6
218 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
219 if (saidx->dst.sa.sa_family == AF_INET6) { \
220 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
221 } else { \
222 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
223 } \
224 } while (0)
225 #else
226 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
227 (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
228 #endif
229
230 /*
231 * IPComp input callback from the crypto driver.
232 */
233 static int
ipcomp_input_cb(struct cryptop * crp)234 ipcomp_input_cb(struct cryptop *crp)
235 {
236 struct tdb_crypto *tc;
237 int skip, protoff;
238 struct mbuf *m;
239 struct secasvar *sav;
240 struct secasindex *saidx __diagused;
241 int s, hlen = IPCOMP_HLENGTH, error, clen;
242 u_int8_t nproto;
243 void *addr;
244 u_int16_t dport;
245 u_int16_t sport;
246
247 tc = (struct tdb_crypto *) crp->crp_opaque;
248 IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
249 skip = tc->tc_skip;
250 protoff = tc->tc_protoff;
251 m = (struct mbuf *) crp->crp_buf;
252
253 /* find the source port for NAT-T */
254 nat_t_ports_get(m, &dport, &sport);
255
256 s = splsoftnet();
257 mutex_enter(softnet_lock);
258
259 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport);
260 if (sav == NULL) {
261 IPCOMP_STATINC(IPCOMP_STAT_NOTDB);
262 DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
263 error = ENOBUFS; /*XXX*/
264 goto bad;
265 }
266
267 saidx = &sav->sah->saidx;
268 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
269 saidx->dst.sa.sa_family == AF_INET6,
270 ("ipcomp_input_cb: unexpected protocol family %u",
271 saidx->dst.sa.sa_family));
272
273 /* Check for crypto errors */
274 if (crp->crp_etype) {
275 /* Reset the session ID */
276 if (sav->tdb_cryptoid != 0)
277 sav->tdb_cryptoid = crp->crp_sid;
278
279 if (crp->crp_etype == EAGAIN) {
280 KEY_FREESAV(&sav);
281 mutex_exit(softnet_lock);
282 splx(s);
283 return crypto_dispatch(crp);
284 }
285
286 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM);
287 DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
288 error = crp->crp_etype;
289 goto bad;
290 }
291 /* Shouldn't happen... */
292 if (m == NULL) {
293 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
294 DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
295 error = EINVAL;
296 goto bad;
297 }
298 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp);
299
300 /* Update the counters */
301 IPCOMP_STATADD(IPCOMP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen);
302
303
304 clen = crp->crp_olen; /* Length of data after processing */
305
306 /* Release the crypto descriptors */
307 free(tc, M_XDATA), tc = NULL;
308 crypto_freereq(crp), crp = NULL;
309
310 /* In case it's not done already, adjust the size of the mbuf chain */
311 m->m_pkthdr.len = clen + hlen + skip;
312
313 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
314 IPCOMP_STATINC(IPCOMP_STAT_HDROPS); /*XXX*/
315 DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
316 error = EINVAL; /*XXX*/
317 goto bad;
318 }
319
320 /* Keep the next protocol field */
321 addr = (uint8_t*) mtod(m, struct ip *) + skip;
322 nproto = ((struct ipcomp *) addr)->comp_nxt;
323 if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) {
324 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
325 DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n",
326 ipsec_address(&sav->sah->saidx.dst),
327 (u_long) ntohl(sav->spi)));
328 error = EINVAL;
329 goto bad;
330 }
331
332 /* Remove the IPCOMP header */
333 error = m_striphdr(m, skip, hlen);
334 if (error) {
335 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
336 DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
337 ipsec_address(&sav->sah->saidx.dst),
338 (u_long) ntohl(sav->spi)));
339 goto bad;
340 }
341
342 /* Restore the Next Protocol field */
343 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
344
345 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
346
347 KEY_FREESAV(&sav);
348 mutex_exit(softnet_lock);
349 splx(s);
350 return error;
351 bad:
352 if (sav)
353 KEY_FREESAV(&sav);
354 mutex_exit(softnet_lock);
355 splx(s);
356 if (m)
357 m_freem(m);
358 if (tc != NULL)
359 free(tc, M_XDATA);
360 if (crp)
361 crypto_freereq(crp);
362 return error;
363 }
364
365 /*
366 * IPComp output routine, called by ipsec[46]_process_packet()
367 */
368 static int
ipcomp_output(struct mbuf * m,struct ipsecrequest * isr,struct mbuf ** mp,int skip,int protoff)369 ipcomp_output(
370 struct mbuf *m,
371 struct ipsecrequest *isr,
372 struct mbuf **mp,
373 int skip,
374 int protoff
375 )
376 {
377 const struct secasvar *sav;
378 const struct comp_algo *ipcompx;
379 int error, ralen, hlen, maxpacketsize;
380 struct cryptodesc *crdc;
381 struct cryptop *crp;
382 struct tdb_crypto *tc;
383
384 IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
385 sav = isr->sav;
386 IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
387 ipcompx = sav->tdb_compalgxform;
388 IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
389
390 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
391
392 /* Don't process the packet if it is too short */
393 if (ralen < ipcompx->minlen) {
394 IPCOMP_STATINC(IPCOMP_STAT_MINLEN);
395 return ipsec_process_done(m,isr);
396 }
397
398 hlen = IPCOMP_HLENGTH;
399
400 IPCOMP_STATINC(IPCOMP_STAT_OUTPUT);
401
402 /* Check for maximum packet size violations. */
403 switch (sav->sah->saidx.dst.sa.sa_family) {
404 #ifdef INET
405 case AF_INET:
406 maxpacketsize = IP_MAXPACKET;
407 break;
408 #endif /* INET */
409 #ifdef INET6
410 case AF_INET6:
411 maxpacketsize = IPV6_MAXPACKET;
412 break;
413 #endif /* INET6 */
414 default:
415 IPCOMP_STATINC(IPCOMP_STAT_NOPF);
416 DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
417 ", IPCA %s/%08lx\n",
418 sav->sah->saidx.dst.sa.sa_family,
419 ipsec_address(&sav->sah->saidx.dst),
420 (u_long) ntohl(sav->spi)));
421 error = EPFNOSUPPORT;
422 goto bad;
423 }
424 if (skip + hlen + ralen > maxpacketsize) {
425 IPCOMP_STATINC(IPCOMP_STAT_TOOBIG);
426 DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
427 "(len %u, max len %u)\n",
428 ipsec_address(&sav->sah->saidx.dst),
429 (u_long) ntohl(sav->spi),
430 skip + hlen + ralen, maxpacketsize));
431 error = EMSGSIZE;
432 goto bad;
433 }
434
435 /* Update the counters */
436 IPCOMP_STATADD(IPCOMP_STAT_OBYTES, m->m_pkthdr.len - skip);
437
438 m = m_clone(m);
439 if (m == NULL) {
440 IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
441 DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
442 ipsec_address(&sav->sah->saidx.dst),
443 (u_long) ntohl(sav->spi)));
444 error = ENOBUFS;
445 goto bad;
446 }
447
448 /* Ok now, we can pass to the crypto processing */
449
450 /* Get crypto descriptors */
451 crp = crypto_getreq(1);
452 if (crp == NULL) {
453 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
454 DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
455 error = ENOBUFS;
456 goto bad;
457 }
458 crdc = crp->crp_desc;
459
460 /* Compression descriptor */
461 crdc->crd_skip = skip;
462 crdc->crd_len = m->m_pkthdr.len - skip;
463 crdc->crd_flags = CRD_F_COMP;
464 crdc->crd_inject = skip;
465
466 /* Compression operation */
467 crdc->crd_alg = ipcompx->type;
468
469 /* IPsec-specific opaque crypto info */
470 tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
471 M_XDATA, M_NOWAIT|M_ZERO);
472 if (tc == NULL) {
473 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
474 DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
475 crypto_freereq(crp);
476 error = ENOBUFS;
477 goto bad;
478 }
479
480 tc->tc_isr = isr;
481 tc->tc_spi = sav->spi;
482 tc->tc_dst = sav->sah->saidx.dst;
483 tc->tc_proto = sav->sah->saidx.proto;
484 tc->tc_skip = skip;
485 tc->tc_protoff = protoff;
486
487 /* Crypto operation descriptor */
488 crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
489 crp->crp_flags = CRYPTO_F_IMBUF;
490 crp->crp_buf = m;
491 crp->crp_callback = ipcomp_output_cb;
492 crp->crp_opaque = tc;
493 crp->crp_sid = sav->tdb_cryptoid;
494
495 return crypto_dispatch(crp);
496 bad:
497 if (m)
498 m_freem(m);
499 return (error);
500 }
501
502 /*
503 * IPComp output callback from the crypto driver.
504 */
505 static int
ipcomp_output_cb(struct cryptop * crp)506 ipcomp_output_cb(struct cryptop *crp)
507 {
508 struct tdb_crypto *tc;
509 struct ipsecrequest *isr;
510 struct secasvar *sav;
511 struct mbuf *m, *mo;
512 int s, error, skip, rlen, roff;
513 u_int8_t prot;
514 u_int16_t cpi;
515 struct ipcomp * ipcomp;
516
517
518 tc = (struct tdb_crypto *) crp->crp_opaque;
519 IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
520 m = (struct mbuf *) crp->crp_buf;
521 skip = tc->tc_skip;
522 rlen = crp->crp_ilen - skip;
523
524 s = splsoftnet();
525 mutex_enter(softnet_lock);
526
527 isr = tc->tc_isr;
528 sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0);
529 if (sav == NULL) {
530 IPCOMP_STATINC(IPCOMP_STAT_NOTDB);
531 DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
532 error = ENOBUFS; /*XXX*/
533 goto bad;
534 }
535 IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
536
537 /* Check for crypto errors */
538 if (crp->crp_etype) {
539 /* Reset session ID */
540 if (sav->tdb_cryptoid != 0)
541 sav->tdb_cryptoid = crp->crp_sid;
542
543 if (crp->crp_etype == EAGAIN) {
544 KEY_FREESAV(&sav);
545 mutex_exit(softnet_lock);
546 splx(s);
547 return crypto_dispatch(crp);
548 }
549 IPCOMP_STATINC(IPCOMP_STAT_NOXFORM);
550 DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
551 error = crp->crp_etype;
552 goto bad;
553 }
554 /* Shouldn't happen... */
555 if (m == NULL) {
556 IPCOMP_STATINC(IPCOMP_STAT_CRYPTO);
557 DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
558 error = EINVAL;
559 goto bad;
560 }
561 IPCOMP_STATINC(IPCOMP_STAT_HIST + sav->alg_comp);
562
563 if (rlen > crp->crp_olen) {
564 /* Inject IPCOMP header */
565 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
566 if (mo == NULL) {
567 IPCOMP_STATINC(IPCOMP_STAT_WRAP);
568 DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
569 "IPCA %s/%08lx\n",
570 ipsec_address(&sav->sah->saidx.dst),
571 (u_long) ntohl(sav->spi)));
572 error = ENOBUFS;
573 goto bad;
574 }
575 ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff);
576
577 /* Initialize the IPCOMP header */
578 /* XXX alignment always correct? */
579 switch (sav->sah->saidx.dst.sa.sa_family) {
580 #ifdef INET
581 case AF_INET:
582 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
583 break;
584 #endif /* INET */
585 #ifdef INET6
586 case AF_INET6:
587 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
588 break;
589 #endif
590 }
591 ipcomp->comp_flags = 0;
592
593 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
594 cpi = sav->alg_enc;
595 else
596 cpi = ntohl(sav->spi) & 0xffff;
597 ipcomp->comp_cpi = htons(cpi);
598
599 /* Fix Next Protocol in IPv4/IPv6 header */
600 prot = IPPROTO_IPCOMP;
601 m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot);
602
603 /* Adjust the length in the IP header */
604 switch (sav->sah->saidx.dst.sa.sa_family) {
605 #ifdef INET
606 case AF_INET:
607 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
608 break;
609 #endif /* INET */
610 #ifdef INET6
611 case AF_INET6:
612 mtod(m, struct ip6_hdr *)->ip6_plen =
613 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
614 break;
615 #endif /* INET6 */
616 default:
617 IPCOMP_STATINC(IPCOMP_STAT_NOPF);
618 DPRINTF(("ipcomp_output: unknown/unsupported protocol "
619 "family %d, IPCA %s/%08lx\n",
620 sav->sah->saidx.dst.sa.sa_family,
621 ipsec_address(&sav->sah->saidx.dst),
622 (u_long) ntohl(sav->spi)));
623 error = EPFNOSUPPORT;
624 goto bad;
625 }
626 } else {
627 /* compression was useless, we have lost time */
628 IPCOMP_STATINC(IPCOMP_STAT_USELESS);
629 DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d"
630 "and compressed size is %d\n", rlen, crp->crp_olen));
631 }
632
633
634 /* Release the crypto descriptor */
635 free(tc, M_XDATA);
636 crypto_freereq(crp);
637
638 /* NB: m is reclaimed by ipsec_process_done. */
639 error = ipsec_process_done(m, isr);
640 KEY_FREESAV(&sav);
641 mutex_exit(softnet_lock);
642 splx(s);
643 return error;
644 bad:
645 if (sav)
646 KEY_FREESAV(&sav);
647 mutex_exit(softnet_lock);
648 splx(s);
649 if (m)
650 m_freem(m);
651 free(tc, M_XDATA);
652 crypto_freereq(crp);
653 return error;
654 }
655
656 static struct xformsw ipcomp_xformsw = {
657 XF_IPCOMP, XFT_COMP, "IPcomp",
658 ipcomp_init, ipcomp_zeroize, ipcomp_input,
659 ipcomp_output,
660 NULL,
661 };
662
663 INITFN void
ipcomp_attach(void)664 ipcomp_attach(void)
665 {
666 ipcompstat_percpu = percpu_alloc(sizeof(uint64_t) * IPCOMP_NSTATS);
667 xform_register(&ipcomp_xformsw);
668 }
669
670 #ifdef __FreeBSD__
671 SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
672 #endif /* __FreeBSD__ */
673