1 /* $FreeBSD$ */
2 /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol ([email protected])
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /* IP payload compression protocol (IPComp), see RFC 2393 */
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36 #include "opt_ipsec.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/mbuf.h>
41 #include <sys/lock.h>
42 #include <sys/mutex.h>
43 #include <sys/socket.h>
44 #include <sys/kernel.h>
45 #include <sys/protosw.h>
46 #include <sys/sysctl.h>
47
48 #include <netinet/in.h>
49 #include <netinet/in_systm.h>
50 #include <netinet/ip.h>
51 #include <netinet/ip_var.h>
52 #include <netinet/ip_encap.h>
53
54 #include <net/netisr.h>
55 #include <net/vnet.h>
56 #include <net/if.h> /* XXXGL: net_epoch should move out there */
57 #include <net/if_var.h> /* XXXGL: net_epoch should move out there */
58
59 #include <netipsec/ipsec.h>
60 #include <netipsec/xform.h>
61
62 #ifdef INET6
63 #include <netinet/ip6.h>
64 #include <netinet6/ip6_var.h>
65 #include <netipsec/ipsec6.h>
66 #endif
67
68 #include <netipsec/ipcomp.h>
69 #include <netipsec/ipcomp_var.h>
70
71 #include <netipsec/key.h>
72 #include <netipsec/key_debug.h>
73
74 #include <opencrypto/cryptodev.h>
75 #include <opencrypto/deflate.h>
76 #include <opencrypto/xform.h>
77
78 VNET_DEFINE(int, ipcomp_enable) = 1;
79 VNET_PCPUSTAT_DEFINE(struct ipcompstat, ipcompstat);
80 VNET_PCPUSTAT_SYSINIT(ipcompstat);
81
82 #ifdef VIMAGE
83 VNET_PCPUSTAT_SYSUNINIT(ipcompstat);
84 #endif /* VIMAGE */
85
86 SYSCTL_DECL(_net_inet_ipcomp);
87 SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, ipcomp_enable,
88 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ipcomp_enable), 0, "");
89 SYSCTL_VNET_PCPUSTAT(_net_inet_ipcomp, IPSECCTL_STATS, stats,
90 struct ipcompstat, ipcompstat,
91 "IPCOMP statistics (struct ipcompstat, netipsec/ipcomp_var.h");
92
93 static int ipcomp_input_cb(struct cryptop *crp);
94 static int ipcomp_output_cb(struct cryptop *crp);
95
96 /*
97 * RFC 3173 p 2.2. Non-Expansion Policy:
98 * If the total size of a compressed payload and the IPComp header, as
99 * defined in section 3, is not smaller than the size of the original
100 * payload, the IP datagram MUST be sent in the original non-compressed
101 * form.
102 *
103 * When we use IPComp in tunnel mode, for small packets we will receive
104 * encapsulated IP-IP datagrams without any compression and without IPComp
105 * header.
106 */
107 static int
ipcomp_encapcheck(union sockaddr_union * src,union sockaddr_union * dst)108 ipcomp_encapcheck(union sockaddr_union *src, union sockaddr_union *dst)
109 {
110 struct secasvar *sav;
111
112 sav = key_allocsa_tunnel(src, dst, IPPROTO_IPCOMP);
113 if (sav == NULL)
114 return (0);
115 key_freesav(&sav);
116
117 if (src->sa.sa_family == AF_INET)
118 return (sizeof(struct in_addr) << 4);
119 else
120 return (sizeof(struct in6_addr) << 4);
121 }
122
123 static int
ipcomp_nonexp_input(struct mbuf * m,int off,int proto,void * arg __unused)124 ipcomp_nonexp_input(struct mbuf *m, int off, int proto, void *arg __unused)
125 {
126 int isr;
127
128 NET_EPOCH_ASSERT();
129
130 switch (proto) {
131 #ifdef INET
132 case IPPROTO_IPV4:
133 isr = NETISR_IP;
134 break;
135 #endif
136 #ifdef INET6
137 case IPPROTO_IPV6:
138 isr = NETISR_IPV6;
139 break;
140 #endif
141 default:
142 IPCOMPSTAT_INC(ipcomps_nopf);
143 m_freem(m);
144 return (IPPROTO_DONE);
145 }
146 m_adj(m, off);
147 IPCOMPSTAT_ADD(ipcomps_ibytes, m->m_pkthdr.len);
148 IPCOMPSTAT_INC(ipcomps_input);
149 netisr_dispatch(isr, m);
150 return (IPPROTO_DONE);
151 }
152
153 /*
154 * ipcomp_init() is called when an CPI is being set up.
155 */
156 static int
ipcomp_init(struct secasvar * sav,struct xformsw * xsp)157 ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
158 {
159 const struct comp_algo *tcomp;
160 struct crypto_session_params csp;
161
162 /* NB: algorithm really comes in alg_enc and not alg_comp! */
163 tcomp = comp_algorithm_lookup(sav->alg_enc);
164 if (tcomp == NULL) {
165 DPRINTF(("%s: unsupported compression algorithm %d\n", __func__,
166 sav->alg_comp));
167 return EINVAL;
168 }
169 sav->alg_comp = sav->alg_enc; /* set for doing histogram */
170 sav->tdb_xform = xsp;
171 sav->tdb_compalgxform = tcomp;
172
173 /* Initialize crypto session */
174 memset(&csp, 0, sizeof(csp));
175 csp.csp_mode = CSP_MODE_COMPRESS;
176 csp.csp_cipher_alg = sav->tdb_compalgxform->type;
177
178 return crypto_newsession(&sav->tdb_cryptoid, &csp, V_crypto_support);
179 }
180
181 /*
182 * ipcomp_cleanup() used when IPCA is deleted
183 */
184 static void
ipcomp_cleanup(struct secasvar * sav)185 ipcomp_cleanup(struct secasvar *sav)
186 {
187
188 crypto_freesession(sav->tdb_cryptoid);
189 sav->tdb_cryptoid = NULL;
190 }
191
192 /*
193 * ipcomp_input() gets called to uncompress an input packet
194 */
195 static int
ipcomp_input(struct mbuf * m,struct secasvar * sav,int skip,int protoff)196 ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
197 {
198 struct xform_data *xd;
199 struct cryptop *crp;
200 struct ipcomp *ipcomp;
201 crypto_session_t cryptoid;
202 caddr_t addr;
203 int error, hlen = IPCOMP_HLENGTH;
204
205 /*
206 * Check that the next header of the IPComp is not IPComp again, before
207 * doing any real work. Given it is not possible to do double
208 * compression it means someone is playing tricks on us.
209 */
210 error = ENOBUFS;
211 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
212 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
213 DPRINTF(("%s: m_pullup failed\n", __func__));
214 key_freesav(&sav);
215 return (error);
216 }
217 addr = (caddr_t) mtod(m, struct ip *) + skip;
218 ipcomp = (struct ipcomp *)addr;
219 if (ipcomp->comp_nxt == IPPROTO_IPCOMP) {
220 IPCOMPSTAT_INC(ipcomps_pdrops); /* XXX have our own stats? */
221 DPRINTF(("%s: recursive compression detected\n", __func__));
222 error = EINVAL;
223 goto bad;
224 }
225
226 SECASVAR_LOCK(sav);
227 cryptoid = sav->tdb_cryptoid;
228 SECASVAR_UNLOCK(sav);
229
230 /* Get crypto descriptors */
231 crp = crypto_getreq(cryptoid, M_NOWAIT);
232 if (crp == NULL) {
233 DPRINTF(("%s: no crypto descriptors\n", __func__));
234 IPCOMPSTAT_INC(ipcomps_crypto);
235 goto bad;
236 }
237 /* Get IPsec-specific opaque pointer */
238 xd = malloc(sizeof(*xd), M_XDATA, M_NOWAIT | M_ZERO);
239 if (xd == NULL) {
240 DPRINTF(("%s: cannot allocate xform_data\n", __func__));
241 IPCOMPSTAT_INC(ipcomps_crypto);
242 crypto_freereq(crp);
243 goto bad;
244 }
245
246 /* Decompression operation */
247 crp->crp_op = CRYPTO_OP_DECOMPRESS;
248 crp->crp_payload_start = skip + hlen;
249 crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen);
250
251 /* Crypto operation descriptor */
252 crp->crp_flags = CRYPTO_F_CBIFSYNC;
253 crypto_use_mbuf(crp, m);
254 crp->crp_callback = ipcomp_input_cb;
255 crp->crp_opaque = xd;
256
257 /* These are passed as-is to the callback */
258 xd->sav = sav;
259 xd->protoff = protoff;
260 xd->skip = skip;
261 xd->vnet = curvnet;
262 xd->cryptoid = cryptoid;
263
264 SECASVAR_LOCK(sav);
265 crp->crp_session = xd->cryptoid = sav->tdb_cryptoid;
266 SECASVAR_UNLOCK(sav);
267
268 return crypto_dispatch(crp);
269 bad:
270 m_freem(m);
271 key_freesav(&sav);
272 return (error);
273 }
274
275 /*
276 * IPComp input callback from the crypto driver.
277 */
278 static int
ipcomp_input_cb(struct cryptop * crp)279 ipcomp_input_cb(struct cryptop *crp)
280 {
281 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
282 struct xform_data *xd;
283 struct mbuf *m;
284 struct secasvar *sav;
285 struct secasindex *saidx;
286 caddr_t addr;
287 crypto_session_t cryptoid;
288 int hlen = IPCOMP_HLENGTH, error, clen;
289 int skip, protoff;
290 uint8_t nproto;
291
292 m = crp->crp_buf.cb_mbuf;
293 xd = crp->crp_opaque;
294 CURVNET_SET(xd->vnet);
295 sav = xd->sav;
296 skip = xd->skip;
297 protoff = xd->protoff;
298 cryptoid = xd->cryptoid;
299 saidx = &sav->sah->saidx;
300 IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
301 saidx->dst.sa.sa_family == AF_INET6,
302 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
303
304 /* Check for crypto errors */
305 if (crp->crp_etype) {
306 if (crp->crp_etype == EAGAIN) {
307 /* Reset the session ID */
308 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
309 crypto_freesession(cryptoid);
310 xd->cryptoid = crp->crp_session;
311 CURVNET_RESTORE();
312 return (crypto_dispatch(crp));
313 }
314 IPCOMPSTAT_INC(ipcomps_noxform);
315 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
316 error = crp->crp_etype;
317 goto bad;
318 }
319 /* Shouldn't happen... */
320 if (m == NULL) {
321 IPCOMPSTAT_INC(ipcomps_crypto);
322 DPRINTF(("%s: null mbuf returned from crypto\n", __func__));
323 error = EINVAL;
324 goto bad;
325 }
326 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
327
328 clen = crp->crp_olen; /* Length of data after processing */
329
330 /* Release the crypto descriptors */
331 free(xd, M_XDATA), xd = NULL;
332 crypto_freereq(crp), crp = NULL;
333
334 /* In case it's not done already, adjust the size of the mbuf chain */
335 m->m_pkthdr.len = clen + hlen + skip;
336
337 if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == NULL) {
338 IPCOMPSTAT_INC(ipcomps_hdrops); /*XXX*/
339 DPRINTF(("%s: m_pullup failed\n", __func__));
340 error = EINVAL; /*XXX*/
341 goto bad;
342 }
343
344 /* Keep the next protocol field */
345 addr = (caddr_t) mtod(m, struct ip *) + skip;
346 nproto = ((struct ipcomp *) addr)->comp_nxt;
347
348 /* Remove the IPCOMP header */
349 error = m_striphdr(m, skip, hlen);
350 if (error) {
351 IPCOMPSTAT_INC(ipcomps_hdrops);
352 DPRINTF(("%s: bad mbuf chain, IPCA %s/%08lx\n", __func__,
353 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
354 (u_long) ntohl(sav->spi)));
355 goto bad;
356 }
357
358 /* Restore the Next Protocol field */
359 m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
360
361 switch (saidx->dst.sa.sa_family) {
362 #ifdef INET6
363 case AF_INET6:
364 error = ipsec6_common_input_cb(m, sav, skip, protoff);
365 break;
366 #endif
367 #ifdef INET
368 case AF_INET:
369 error = ipsec4_common_input_cb(m, sav, skip, protoff);
370 break;
371 #endif
372 default:
373 panic("%s: Unexpected address family: %d saidx=%p", __func__,
374 saidx->dst.sa.sa_family, saidx);
375 }
376 CURVNET_RESTORE();
377 return error;
378 bad:
379 CURVNET_RESTORE();
380 if (sav != NULL)
381 key_freesav(&sav);
382 if (m != NULL)
383 m_freem(m);
384 if (xd != NULL)
385 free(xd, M_XDATA);
386 if (crp != NULL)
387 crypto_freereq(crp);
388 return error;
389 }
390
391 /*
392 * IPComp output routine, called by ipsec[46]_perform_request()
393 */
394 static int
ipcomp_output(struct mbuf * m,struct secpolicy * sp,struct secasvar * sav,u_int idx,int skip,int protoff)395 ipcomp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
396 u_int idx, int skip, int protoff)
397 {
398 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
399 const struct comp_algo *ipcompx;
400 struct cryptop *crp;
401 struct xform_data *xd;
402 crypto_session_t cryptoid;
403 int error, ralen, maxpacketsize;
404
405 IPSEC_ASSERT(sav != NULL, ("null SA"));
406 ipcompx = sav->tdb_compalgxform;
407 IPSEC_ASSERT(ipcompx != NULL, ("null compression xform"));
408
409 /*
410 * Do not touch the packet in case our payload to compress
411 * is lower than the minimal threshold of the compression
412 * alogrithm. We will just send out the data uncompressed.
413 * See RFC 3173, 2.2. Non-Expansion Policy.
414 */
415 if (m->m_pkthdr.len <= ipcompx->minlen) {
416 IPCOMPSTAT_INC(ipcomps_threshold);
417 return ipsec_process_done(m, sp, sav, idx);
418 }
419
420 ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
421 IPCOMPSTAT_INC(ipcomps_output);
422
423 /* Check for maximum packet size violations. */
424 switch (sav->sah->saidx.dst.sa.sa_family) {
425 #ifdef INET
426 case AF_INET:
427 maxpacketsize = IP_MAXPACKET;
428 break;
429 #endif /* INET */
430 #ifdef INET6
431 case AF_INET6:
432 maxpacketsize = IPV6_MAXPACKET;
433 break;
434 #endif /* INET6 */
435 default:
436 IPCOMPSTAT_INC(ipcomps_nopf);
437 DPRINTF(("%s: unknown/unsupported protocol family %d, "
438 "IPCA %s/%08lx\n", __func__,
439 sav->sah->saidx.dst.sa.sa_family,
440 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
441 (u_long) ntohl(sav->spi)));
442 error = EPFNOSUPPORT;
443 goto bad;
444 }
445 if (ralen + skip + IPCOMP_HLENGTH > maxpacketsize) {
446 IPCOMPSTAT_INC(ipcomps_toobig);
447 DPRINTF(("%s: packet in IPCA %s/%08lx got too big "
448 "(len %u, max len %u)\n", __func__,
449 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
450 (u_long) ntohl(sav->spi),
451 ralen + skip + IPCOMP_HLENGTH, maxpacketsize));
452 error = EMSGSIZE;
453 goto bad;
454 }
455
456 /* Update the counters */
457 IPCOMPSTAT_ADD(ipcomps_obytes, m->m_pkthdr.len - skip);
458
459 m = m_unshare(m, M_NOWAIT);
460 if (m == NULL) {
461 IPCOMPSTAT_INC(ipcomps_hdrops);
462 DPRINTF(("%s: cannot clone mbuf chain, IPCA %s/%08lx\n",
463 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
464 sizeof(buf)), (u_long) ntohl(sav->spi)));
465 error = ENOBUFS;
466 goto bad;
467 }
468
469 /* Ok now, we can pass to the crypto processing. */
470 SECASVAR_LOCK(sav);
471 cryptoid = sav->tdb_cryptoid;
472 SECASVAR_UNLOCK(sav);
473
474 /* Get crypto descriptors */
475 crp = crypto_getreq(cryptoid, M_NOWAIT);
476 if (crp == NULL) {
477 IPCOMPSTAT_INC(ipcomps_crypto);
478 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
479 error = ENOBUFS;
480 goto bad;
481 }
482
483 /* Compression descriptor */
484 crp->crp_op = CRYPTO_OP_COMPRESS;
485 crp->crp_payload_start = skip;
486 crp->crp_payload_length = ralen;
487
488 /* IPsec-specific opaque crypto info */
489 xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO);
490 if (xd == NULL) {
491 IPCOMPSTAT_INC(ipcomps_crypto);
492 DPRINTF(("%s: failed to allocate xform_data\n", __func__));
493 crypto_freereq(crp);
494 error = ENOBUFS;
495 goto bad;
496 }
497
498 xd->sp = sp;
499 xd->sav = sav;
500 xd->idx = idx;
501 xd->skip = skip;
502 xd->protoff = protoff;
503 xd->vnet = curvnet;
504 xd->cryptoid = cryptoid;
505
506 /* Crypto operation descriptor */
507 crp->crp_flags = CRYPTO_F_CBIFSYNC;
508 crypto_use_mbuf(crp, m);
509 crp->crp_callback = ipcomp_output_cb;
510 crp->crp_opaque = xd;
511
512 return crypto_dispatch(crp);
513 bad:
514 if (m)
515 m_freem(m);
516 key_freesav(&sav);
517 key_freesp(&sp);
518 return (error);
519 }
520
521 /*
522 * IPComp output callback from the crypto driver.
523 */
524 static int
ipcomp_output_cb(struct cryptop * crp)525 ipcomp_output_cb(struct cryptop *crp)
526 {
527 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
528 struct xform_data *xd;
529 struct secpolicy *sp;
530 struct secasvar *sav;
531 struct mbuf *m;
532 crypto_session_t cryptoid;
533 u_int idx;
534 int error, skip, protoff;
535
536 m = crp->crp_buf.cb_mbuf;
537 xd = crp->crp_opaque;
538 CURVNET_SET(xd->vnet);
539 idx = xd->idx;
540 sp = xd->sp;
541 sav = xd->sav;
542 skip = xd->skip;
543 protoff = xd->protoff;
544 cryptoid = xd->cryptoid;
545
546 /* Check for crypto errors */
547 if (crp->crp_etype) {
548 if (crp->crp_etype == EAGAIN) {
549 /* Reset the session ID */
550 if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0)
551 crypto_freesession(cryptoid);
552 xd->cryptoid = crp->crp_session;
553 CURVNET_RESTORE();
554 return (crypto_dispatch(crp));
555 }
556 IPCOMPSTAT_INC(ipcomps_noxform);
557 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
558 error = crp->crp_etype;
559 goto bad;
560 }
561 /* Shouldn't happen... */
562 if (m == NULL) {
563 IPCOMPSTAT_INC(ipcomps_crypto);
564 DPRINTF(("%s: bogus return buffer from crypto\n", __func__));
565 error = EINVAL;
566 goto bad;
567 }
568 IPCOMPSTAT_INC(ipcomps_hist[sav->alg_comp]);
569
570 if (crp->crp_payload_length > crp->crp_olen) {
571 struct mbuf *mo;
572 struct ipcomp *ipcomp;
573 int roff;
574 uint8_t prot;
575
576 /* Compression helped, inject IPCOMP header. */
577 mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
578 if (mo == NULL) {
579 IPCOMPSTAT_INC(ipcomps_wrap);
580 DPRINTF(("%s: IPCOMP header inject failed "
581 "for IPCA %s/%08lx\n",
582 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
583 sizeof(buf)), (u_long) ntohl(sav->spi)));
584 error = ENOBUFS;
585 goto bad;
586 }
587 ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
588
589 /* Initialize the IPCOMP header */
590 /* XXX alignment always correct? */
591 switch (sav->sah->saidx.dst.sa.sa_family) {
592 #ifdef INET
593 case AF_INET:
594 ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
595 break;
596 #endif /* INET */
597 #ifdef INET6
598 case AF_INET6:
599 ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
600 break;
601 #endif
602 }
603 ipcomp->comp_flags = 0;
604 ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
605
606 /* Fix Next Protocol in IPv4/IPv6 header */
607 prot = IPPROTO_IPCOMP;
608 m_copyback(m, protoff, sizeof(u_int8_t),
609 (u_char *)&prot);
610
611 /* Adjust the length in the IP header */
612 switch (sav->sah->saidx.dst.sa.sa_family) {
613 #ifdef INET
614 case AF_INET:
615 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
616 break;
617 #endif /* INET */
618 #ifdef INET6
619 case AF_INET6:
620 mtod(m, struct ip6_hdr *)->ip6_plen =
621 htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
622 break;
623 #endif /* INET6 */
624 default:
625 IPCOMPSTAT_INC(ipcomps_nopf);
626 DPRINTF(("%s: unknown/unsupported protocol "
627 "family %d, IPCA %s/%08lx\n", __func__,
628 sav->sah->saidx.dst.sa.sa_family,
629 ipsec_address(&sav->sah->saidx.dst, buf,
630 sizeof(buf)), (u_long) ntohl(sav->spi)));
631 error = EPFNOSUPPORT;
632 goto bad;
633 }
634 } else {
635 /* Compression was useless, we have lost time. */
636 IPCOMPSTAT_INC(ipcomps_uncompr);
637 DPRINTF(("%s: compressions was useless %d <= %d\n",
638 __func__, crp->crp_payload_length, crp->crp_olen));
639 /* XXX remember state to not compress the next couple
640 * of packets, RFC 3173, 2.2. Non-Expansion Policy */
641 }
642
643 /* Release the crypto descriptor */
644 free(xd, M_XDATA);
645 crypto_freereq(crp);
646
647 /* NB: m is reclaimed by ipsec_process_done. */
648 error = ipsec_process_done(m, sp, sav, idx);
649 CURVNET_RESTORE();
650 return (error);
651 bad:
652 if (m)
653 m_freem(m);
654 CURVNET_RESTORE();
655 free(xd, M_XDATA);
656 crypto_freereq(crp);
657 key_freesav(&sav);
658 key_freesp(&sp);
659 return (error);
660 }
661
662 #ifdef INET
663 static int
ipcomp4_nonexp_encapcheck(const struct mbuf * m,int off,int proto,void * arg __unused)664 ipcomp4_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
665 void *arg __unused)
666 {
667 union sockaddr_union src, dst;
668 const struct ip *ip;
669
670 if (V_ipcomp_enable == 0)
671 return (0);
672 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
673 return (0);
674 bzero(&src, sizeof(src));
675 bzero(&dst, sizeof(dst));
676 src.sa.sa_family = dst.sa.sa_family = AF_INET;
677 src.sin.sin_len = dst.sin.sin_len = sizeof(struct sockaddr_in);
678 ip = mtod(m, const struct ip *);
679 src.sin.sin_addr = ip->ip_src;
680 dst.sin.sin_addr = ip->ip_dst;
681 return (ipcomp_encapcheck(&src, &dst));
682 }
683
684 static const struct encaptab *ipe4_cookie = NULL;
685 static const struct encap_config ipv4_encap_cfg = {
686 .proto = -1,
687 .min_length = sizeof(struct ip),
688 .exact_match = sizeof(in_addr_t) << 4,
689 .check = ipcomp4_nonexp_encapcheck,
690 .input = ipcomp_nonexp_input
691 };
692 #endif
693 #ifdef INET6
694 static int
ipcomp6_nonexp_encapcheck(const struct mbuf * m,int off,int proto,void * arg __unused)695 ipcomp6_nonexp_encapcheck(const struct mbuf *m, int off, int proto,
696 void *arg __unused)
697 {
698 union sockaddr_union src, dst;
699 const struct ip6_hdr *ip6;
700
701 if (V_ipcomp_enable == 0)
702 return (0);
703 if (proto != IPPROTO_IPV4 && proto != IPPROTO_IPV6)
704 return (0);
705 bzero(&src, sizeof(src));
706 bzero(&dst, sizeof(dst));
707 src.sa.sa_family = dst.sa.sa_family = AF_INET;
708 src.sin6.sin6_len = dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
709 ip6 = mtod(m, const struct ip6_hdr *);
710 src.sin6.sin6_addr = ip6->ip6_src;
711 dst.sin6.sin6_addr = ip6->ip6_dst;
712 if (IN6_IS_SCOPE_LINKLOCAL(&src.sin6.sin6_addr)) {
713 /* XXX: sa6_recoverscope() */
714 src.sin6.sin6_scope_id =
715 ntohs(src.sin6.sin6_addr.s6_addr16[1]);
716 src.sin6.sin6_addr.s6_addr16[1] = 0;
717 }
718 if (IN6_IS_SCOPE_LINKLOCAL(&dst.sin6.sin6_addr)) {
719 /* XXX: sa6_recoverscope() */
720 dst.sin6.sin6_scope_id =
721 ntohs(dst.sin6.sin6_addr.s6_addr16[1]);
722 dst.sin6.sin6_addr.s6_addr16[1] = 0;
723 }
724 return (ipcomp_encapcheck(&src, &dst));
725 }
726
727 static const struct encaptab *ipe6_cookie = NULL;
728 static const struct encap_config ipv6_encap_cfg = {
729 .proto = -1,
730 .min_length = sizeof(struct ip6_hdr),
731 .exact_match = sizeof(struct in6_addr) << 4,
732 .check = ipcomp6_nonexp_encapcheck,
733 .input = ipcomp_nonexp_input
734 };
735 #endif
736
737 static struct xformsw ipcomp_xformsw = {
738 .xf_type = XF_IPCOMP,
739 .xf_name = "IPcomp",
740 .xf_init = ipcomp_init,
741 .xf_cleanup = ipcomp_cleanup,
742 .xf_input = ipcomp_input,
743 .xf_output = ipcomp_output,
744 };
745
746 static void
ipcomp_attach(void)747 ipcomp_attach(void)
748 {
749
750 #ifdef INET
751 ipe4_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
752 #endif
753 #ifdef INET6
754 ipe6_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
755 #endif
756 xform_attach(&ipcomp_xformsw);
757 }
758
759 static void
ipcomp_detach(void)760 ipcomp_detach(void)
761 {
762
763 #ifdef INET
764 ip_encap_detach(ipe4_cookie);
765 #endif
766 #ifdef INET6
767 ip6_encap_detach(ipe6_cookie);
768 #endif
769 xform_detach(&ipcomp_xformsw);
770 }
771
772 SYSINIT(ipcomp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
773 ipcomp_attach, NULL);
774 SYSUNINIT(ipcomp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
775 ipcomp_detach, NULL);
776