Annotation of src/sys/netipsec/xform_ipcomp.c, Revision 1.5.4.6
1.5.4.6 ! yamt 1: /* $NetBSD: xform_ipcomp.c,v 1.5.4.5 2008/01/21 09:47:27 yamt 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>
1.5.4.6 ! yamt 33: __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.5.4.5 2008/01/21 09:47:27 yamt 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:
1.5.4.2 yamt 75: int ipcomp_enable = 1;
1.1 jonathan 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;
1.5.4.6 ! yamt 109: int ses;
1.1 jonathan 110:
111: /* NB: algorithm really comes in alg_enc and not alg_comp! */
112: tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
113: if (tcomp == NULL) {
114: DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
115: sav->alg_comp));
116: return EINVAL;
117: }
118: sav->alg_comp = sav->alg_enc; /* set for doing histogram */
119: sav->tdb_xform = xsp;
120: sav->tdb_compalgxform = tcomp;
121:
122: /* Initialize crypto session */
123: bzero(&cric, sizeof (cric));
124: cric.cri_alg = sav->tdb_compalgxform->type;
125:
1.5.4.6 ! yamt 126: mutex_spin_enter(&crypto_mtx);
! 127: ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
! 128: mutex_spin_exit(&crypto_mtx);
! 129: return ses;
1.1 jonathan 130: }
131:
132: /*
133: * ipcomp_zeroize() used when IPCA is deleted
134: */
135: static int
136: ipcomp_zeroize(struct secasvar *sav)
137: {
138: int err;
139:
1.5.4.6 ! yamt 140: mutex_spin_enter(&crypto_mtx);
1.1 jonathan 141: err = crypto_freesession(sav->tdb_cryptoid);
1.5.4.6 ! yamt 142: mutex_spin_exit(&crypto_mtx);
1.1 jonathan 143: sav->tdb_cryptoid = 0;
144: return err;
145: }
146:
147: /*
148: * ipcomp_input() gets called to uncompress an input packet
149: */
150: static int
151: ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
152: {
153: struct tdb_crypto *tc;
154: struct cryptodesc *crdc;
155: struct cryptop *crp;
156: int hlen = IPCOMP_HLENGTH;
157:
158: IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
159:
160: /* Get crypto descriptors */
161: crp = crypto_getreq(1);
162: if (crp == NULL) {
163: m_freem(m);
164: DPRINTF(("ipcomp_input: no crypto descriptors\n"));
165: ipcompstat.ipcomps_crypto++;
166: return ENOBUFS;
167: }
168: /* Get IPsec-specific opaque pointer */
169: tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
170: if (tc == NULL) {
171: m_freem(m);
172: crypto_freereq(crp);
173: DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
174: ipcompstat.ipcomps_crypto++;
175: return ENOBUFS;
176: }
177: crdc = crp->crp_desc;
178:
179: crdc->crd_skip = skip + hlen;
180: crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
181: crdc->crd_inject = skip;
182:
183: tc->tc_ptr = 0;
184:
185: /* Decompression operation */
186: crdc->crd_alg = sav->tdb_compalgxform->type;
187:
188: /* Crypto operation descriptor */
189: crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
190: crp->crp_flags = CRYPTO_F_IMBUF;
1.5.4.3 yamt 191: crp->crp_buf = m;
1.1 jonathan 192: crp->crp_callback = ipcomp_input_cb;
193: crp->crp_sid = sav->tdb_cryptoid;
1.5.4.3 yamt 194: crp->crp_opaque = tc;
1.1 jonathan 195:
196: /* These are passed as-is to the callback */
197: tc->tc_spi = sav->spi;
198: tc->tc_dst = sav->sah->saidx.dst;
199: tc->tc_proto = sav->sah->saidx.proto;
200: tc->tc_protoff = protoff;
201: tc->tc_skip = skip;
202:
203: return crypto_dispatch(crp);
204: }
205:
206: #ifdef INET6
207: #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \
208: if (saidx->dst.sa.sa_family == AF_INET6) { \
209: error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
210: } else { \
211: error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
212: } \
213: } while (0)
214: #else
215: #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \
216: (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
217: #endif
218:
219: /*
220: * IPComp input callback from the crypto driver.
221: */
222: static int
223: ipcomp_input_cb(struct cryptop *crp)
224: {
225: struct cryptodesc *crd;
226: struct tdb_crypto *tc;
227: int skip, protoff;
228: struct mtag *mtag;
229: struct mbuf *m;
230: struct secasvar *sav;
231: struct secasindex *saidx;
232: int s, hlen = IPCOMP_HLENGTH, error, clen;
233: u_int8_t nproto;
1.5.4.3 yamt 234: void *addr;
235: u_int16_t dport = 0;
236: u_int16_t sport = 0;
237: #ifdef IPSEC_NAT_T
238: struct m_tag * tag = NULL;
239: #endif
1.1 jonathan 240:
241: crd = crp->crp_desc;
242:
243: tc = (struct tdb_crypto *) crp->crp_opaque;
244: IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
245: skip = tc->tc_skip;
246: protoff = tc->tc_protoff;
247: mtag = (struct mtag *) tc->tc_ptr;
248: m = (struct mbuf *) crp->crp_buf;
249:
1.5.4.3 yamt 250: #ifdef IPSEC_NAT_T
251: /* find the source port for NAT-T */
252: if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) {
253: sport = ((u_int16_t *)(tag + 1))[0];
254: dport = ((u_int16_t *)(tag + 1))[1];
255: }
256: #endif
257:
1.1 jonathan 258: s = splsoftnet();
259:
1.5.4.3 yamt 260: sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport);
1.1 jonathan 261: if (sav == NULL) {
262: ipcompstat.ipcomps_notdb++;
263: DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
264: error = ENOBUFS; /*XXX*/
265: goto bad;
266: }
267:
268: saidx = &sav->sah->saidx;
269: IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
270: saidx->dst.sa.sa_family == AF_INET6,
271: ("ah_input_cb: unexpected protocol family %u",
272: saidx->dst.sa.sa_family));
273:
274: /* Check for crypto errors */
275: if (crp->crp_etype) {
276: /* Reset the session ID */
277: if (sav->tdb_cryptoid != 0)
278: sav->tdb_cryptoid = crp->crp_sid;
279:
280: if (crp->crp_etype == EAGAIN) {
281: KEY_FREESAV(&sav);
282: splx(s);
283: return crypto_dispatch(crp);
284: }
285:
286: ipcompstat.ipcomps_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: ipcompstat.ipcomps_crypto++;
294: DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
295: error = EINVAL;
296: goto bad;
297: }
298: ipcompstat.ipcomps_hist[sav->alg_comp]++;
299:
300: clen = crp->crp_olen; /* Length of data after processing */
301:
302: /* Release the crypto descriptors */
303: free(tc, M_XDATA), tc = NULL;
304: crypto_freereq(crp), crp = NULL;
305:
306: /* In case it's not done already, adjust the size of the mbuf chain */
307: m->m_pkthdr.len = clen + hlen + skip;
308:
309: if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
310: ipcompstat.ipcomps_hdrops++; /*XXX*/
311: DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
312: error = EINVAL; /*XXX*/
313: goto bad;
314: }
315:
316: /* Keep the next protocol field */
1.5.4.4 yamt 317: addr = (uint8_t*) mtod(m, struct ip *) + skip;
1.1 jonathan 318: nproto = ((struct ipcomp *) addr)->comp_nxt;
319:
320: /* Remove the IPCOMP header */
321: error = m_striphdr(m, skip, hlen);
322: if (error) {
323: ipcompstat.ipcomps_hdrops++;
324: DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
325: ipsec_address(&sav->sah->saidx.dst),
326: (u_long) ntohl(sav->spi)));
327: goto bad;
328: }
329:
330: /* Restore the Next Protocol field */
331: m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
332:
333: IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
334:
335: KEY_FREESAV(&sav);
336: splx(s);
337: return error;
338: bad:
339: if (sav)
340: KEY_FREESAV(&sav);
341: splx(s);
342: if (m)
343: m_freem(m);
344: if (tc != NULL)
345: free(tc, M_XDATA);
346: if (crp)
347: crypto_freereq(crp);
348: return error;
349: }
350:
351: /*
352: * IPComp output routine, called by ipsec[46]_process_packet()
353: */
354: static int
355: ipcomp_output(
1.5.4.1 yamt 356: struct mbuf *m,
357: struct ipsecrequest *isr,
358: struct mbuf **mp,
359: int skip,
360: int protoff
1.1 jonathan 361: )
362: {
363: struct secasvar *sav;
364: struct comp_algo *ipcompx;
1.5.4.2 yamt 365: int error, ralen, hlen, maxpacketsize;
1.1 jonathan 366: struct cryptodesc *crdc;
367: struct cryptop *crp;
368: struct tdb_crypto *tc;
369:
370: IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
371: sav = isr->sav;
372: IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
373: ipcompx = sav->tdb_compalgxform;
374: IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
375:
376: ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
1.5.4.2 yamt 377:
378: /* Don't process the packet if it is too short */
379: if (ralen < ipcompx->minlen) {
380: ipcompstat.ipcomps_minlen++;
381: return ipsec_process_done(m,isr);
382: }
383:
1.1 jonathan 384: hlen = IPCOMP_HLENGTH;
385:
386: ipcompstat.ipcomps_output++;
387:
388: /* Check for maximum packet size violations. */
389: switch (sav->sah->saidx.dst.sa.sa_family) {
390: #ifdef INET
391: case AF_INET:
392: maxpacketsize = IP_MAXPACKET;
393: break;
394: #endif /* INET */
395: #ifdef INET6
396: case AF_INET6:
397: maxpacketsize = IPV6_MAXPACKET;
398: break;
399: #endif /* INET6 */
400: default:
401: ipcompstat.ipcomps_nopf++;
402: DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
1.5 perry 403: ", IPCA %s/%08lx\n",
1.1 jonathan 404: sav->sah->saidx.dst.sa.sa_family,
405: ipsec_address(&sav->sah->saidx.dst),
406: (u_long) ntohl(sav->spi)));
407: error = EPFNOSUPPORT;
408: goto bad;
409: }
410: if (skip + hlen + ralen > maxpacketsize) {
411: ipcompstat.ipcomps_toobig++;
412: DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
413: "(len %u, max len %u)\n",
414: ipsec_address(&sav->sah->saidx.dst),
415: (u_long) ntohl(sav->spi),
416: skip + hlen + ralen, maxpacketsize));
417: error = EMSGSIZE;
418: goto bad;
419: }
420:
421: /* Update the counters */
422: ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
423:
424: m = m_clone(m);
425: if (m == NULL) {
426: ipcompstat.ipcomps_hdrops++;
1.5 perry 427: DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
1.1 jonathan 428: ipsec_address(&sav->sah->saidx.dst),
429: (u_long) ntohl(sav->spi)));
430: error = ENOBUFS;
431: goto bad;
432: }
433:
434: /* Ok now, we can pass to the crypto processing */
435:
436: /* Get crypto descriptors */
437: crp = crypto_getreq(1);
438: if (crp == NULL) {
439: ipcompstat.ipcomps_crypto++;
440: DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
441: error = ENOBUFS;
442: goto bad;
443: }
444: crdc = crp->crp_desc;
445:
446: /* Compression descriptor */
1.5.4.2 yamt 447: crdc->crd_skip = skip;
448: crdc->crd_len = m->m_pkthdr.len - skip;
1.1 jonathan 449: crdc->crd_flags = CRD_F_COMP;
1.5.4.2 yamt 450: crdc->crd_inject = skip;
1.1 jonathan 451:
452: /* Compression operation */
453: crdc->crd_alg = ipcompx->type;
454:
455: /* IPsec-specific opaque crypto info */
456: tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
457: M_XDATA, M_NOWAIT|M_ZERO);
458: if (tc == NULL) {
459: ipcompstat.ipcomps_crypto++;
460: DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
461: crypto_freereq(crp);
462: error = ENOBUFS;
463: goto bad;
464: }
465:
466: tc->tc_isr = isr;
467: tc->tc_spi = sav->spi;
468: tc->tc_dst = sav->sah->saidx.dst;
469: tc->tc_proto = sav->sah->saidx.proto;
1.5.4.2 yamt 470: tc->tc_skip = skip;
471: tc->tc_protoff = protoff;
1.1 jonathan 472:
473: /* Crypto operation descriptor */
474: crp->crp_ilen = m->m_pkthdr.len; /* Total input length */
475: crp->crp_flags = CRYPTO_F_IMBUF;
1.5.4.3 yamt 476: crp->crp_buf = m;
1.1 jonathan 477: crp->crp_callback = ipcomp_output_cb;
1.5.4.3 yamt 478: crp->crp_opaque = tc;
1.1 jonathan 479: crp->crp_sid = sav->tdb_cryptoid;
480:
481: return crypto_dispatch(crp);
482: bad:
483: if (m)
484: m_freem(m);
485: return (error);
486: }
487:
488: /*
489: * IPComp output callback from the crypto driver.
490: */
491: static int
492: ipcomp_output_cb(struct cryptop *crp)
493: {
494: struct tdb_crypto *tc;
495: struct ipsecrequest *isr;
496: struct secasvar *sav;
1.5.4.2 yamt 497: struct mbuf *m, *mo;
498: int s, error, skip, rlen, roff;
499: u_int8_t prot;
500: u_int16_t cpi;
501: struct ipcomp * ipcomp;
502:
1.1 jonathan 503:
504: tc = (struct tdb_crypto *) crp->crp_opaque;
505: IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
506: m = (struct mbuf *) crp->crp_buf;
507: skip = tc->tc_skip;
508: rlen = crp->crp_ilen - skip;
509:
510: s = splsoftnet();
511:
512: isr = tc->tc_isr;
1.5.4.3 yamt 513: sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0);
1.1 jonathan 514: if (sav == NULL) {
515: ipcompstat.ipcomps_notdb++;
516: DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
517: error = ENOBUFS; /*XXX*/
518: goto bad;
519: }
520: IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
521:
522: /* Check for crypto errors */
523: if (crp->crp_etype) {
524: /* Reset session ID */
525: if (sav->tdb_cryptoid != 0)
526: sav->tdb_cryptoid = crp->crp_sid;
527:
528: if (crp->crp_etype == EAGAIN) {
529: KEY_FREESAV(&sav);
530: splx(s);
531: return crypto_dispatch(crp);
532: }
533: ipcompstat.ipcomps_noxform++;
534: DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
535: error = crp->crp_etype;
536: goto bad;
537: }
538: /* Shouldn't happen... */
539: if (m == NULL) {
540: ipcompstat.ipcomps_crypto++;
541: DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
542: error = EINVAL;
543: goto bad;
544: }
545: ipcompstat.ipcomps_hist[sav->alg_comp]++;
546:
547: if (rlen > crp->crp_olen) {
1.5.4.2 yamt 548: /* Inject IPCOMP header */
549: mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
550: if (mo == NULL) {
551: ipcompstat.ipcomps_wrap++;
552: DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
553: "IPCA %s/%08lx\n",
554: ipsec_address(&sav->sah->saidx.dst),
555: (u_long) ntohl(sav->spi)));
556: error = ENOBUFS;
557: goto bad;
558: }
1.5.4.3 yamt 559: ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff);
1.5.4.2 yamt 560:
561: /* Initialize the IPCOMP header */
562: /* XXX alignment always correct? */
563: switch (sav->sah->saidx.dst.sa.sa_family) {
564: #ifdef INET
565: case AF_INET:
566: ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
567: break;
568: #endif /* INET */
569: #ifdef INET6
570: case AF_INET6:
571: ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
572: break;
573: #endif
574: }
575: ipcomp->comp_flags = 0;
576:
577: if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
578: cpi = sav->alg_enc;
579: else
580: cpi = ntohl(sav->spi) & 0xffff;
581: ipcomp->comp_cpi = htons(cpi);
582:
583: /* Fix Next Protocol in IPv4/IPv6 header */
584: prot = IPPROTO_IPCOMP;
585: m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot);
586:
1.1 jonathan 587: /* Adjust the length in the IP header */
588: switch (sav->sah->saidx.dst.sa.sa_family) {
589: #ifdef INET
590: case AF_INET:
591: mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
592: break;
593: #endif /* INET */
594: #ifdef INET6
595: case AF_INET6:
596: mtod(m, struct ip6_hdr *)->ip6_plen =
597: htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
598: break;
599: #endif /* INET6 */
600: default:
601: ipcompstat.ipcomps_nopf++;
602: DPRINTF(("ipcomp_output: unknown/unsupported protocol "
1.5 perry 603: "family %d, IPCA %s/%08lx\n",
1.1 jonathan 604: sav->sah->saidx.dst.sa.sa_family,
1.5 perry 605: ipsec_address(&sav->sah->saidx.dst),
1.1 jonathan 606: (u_long) ntohl(sav->spi)));
607: error = EPFNOSUPPORT;
608: goto bad;
609: }
610: } else {
611: /* compression was useless, we have lost time */
1.5.4.5 yamt 612: ipcompstat.ipcomps_uselesscomp++;
613: DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d"
614: "and compressed size is %d\n", rlen, crp->crp_olen));
1.1 jonathan 615: }
616:
1.5.4.5 yamt 617:
1.1 jonathan 618: /* Release the crypto descriptor */
619: free(tc, M_XDATA);
620: crypto_freereq(crp);
621:
622: /* NB: m is reclaimed by ipsec_process_done. */
623: error = ipsec_process_done(m, isr);
624: KEY_FREESAV(&sav);
625: splx(s);
626: return error;
627: bad:
628: if (sav)
629: KEY_FREESAV(&sav);
630: splx(s);
631: if (m)
632: m_freem(m);
633: free(tc, M_XDATA);
634: crypto_freereq(crp);
635: return error;
636: }
637:
638: static struct xformsw ipcomp_xformsw = {
639: XF_IPCOMP, XFT_COMP, "IPcomp",
640: ipcomp_init, ipcomp_zeroize, ipcomp_input,
1.5.4.1 yamt 641: ipcomp_output,
642: NULL,
1.1 jonathan 643: };
644:
645: INITFN void
646: ipcomp_attach(void)
647: {
648: xform_register(&ipcomp_xformsw);
649: }
650:
651: #ifdef __FreeBSD__
652: SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
1.4 tls 653: #endif /* __FreeBSD__ */
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