xform_ah.c revision 1.73 1 /* $NetBSD: xform_ah.c,v 1.73 2017/08/10 06:33:51 ozaki-r Exp $ */
2 /* $FreeBSD: src/sys/netipsec/xform_ah.c,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $ */
3 /* $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
4 /*
5 * The authors of this code are John Ioannidis (ji (at) tla.org),
6 * Angelos D. Keromytis (kermit (at) csd.uch.gr) and
7 * Niels Provos (provos (at) physnet.uni-hamburg.de).
8 *
9 * The original version of this code was written by John Ioannidis
10 * for BSD/OS in Athens, Greece, in November 1995.
11 *
12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
13 * by Angelos D. Keromytis.
14 *
15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
16 * and Niels Provos.
17 *
18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
19 *
20 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
21 * Angelos D. Keromytis and Niels Provos.
22 * Copyright (c) 1999 Niklas Hallqvist.
23 * Copyright (c) 2001 Angelos D. Keromytis.
24 *
25 * Permission to use, copy, and modify this software with or without fee
26 * is hereby granted, provided that this entire notice is included in
27 * all copies of any software which is or includes a copy or
28 * modification of this software.
29 * You may use this code under the GNU public license if you so wish. Please
30 * contribute changes back to the authors under this freer than GPL license
31 * so that we may further the use of strong encryption without limitations to
32 * all.
33 *
34 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
35 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
36 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
37 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
38 * PURPOSE.
39 */
40
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: xform_ah.c,v 1.73 2017/08/10 06:33:51 ozaki-r Exp $");
43
44 #if defined(_KERNEL_OPT)
45 #include "opt_inet.h"
46 #include "opt_ipsec.h"
47 #endif
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/mbuf.h>
52 #include <sys/socket.h>
53 #include <sys/syslog.h>
54 #include <sys/kernel.h>
55 #include <sys/sysctl.h>
56 #include <sys/pool.h>
57 #include <sys/pserialize.h>
58
59 #include <net/if.h>
60
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/ip.h>
64 #include <netinet/ip_ecn.h>
65 #include <netinet/ip_var.h>
66 #include <netinet/ip6.h>
67
68 #include <net/route.h>
69 #include <netipsec/ipsec.h>
70 #include <netipsec/ipsec_private.h>
71 #include <netipsec/ah.h>
72 #include <netipsec/ah_var.h>
73 #include <netipsec/xform.h>
74
75 #ifdef INET6
76 #include <netinet6/ip6_var.h>
77 #include <netinet6/scope6_var.h>
78 #include <netipsec/ipsec6.h>
79 #endif
80
81 #include <netipsec/key.h>
82 #include <netipsec/key_debug.h>
83
84 #include <opencrypto/cryptodev.h>
85
86 /*
87 * Return header size in bytes. The old protocol did not support
88 * the replay counter; the new protocol always includes the counter.
89 */
90 #define HDRSIZE(sav) \
91 (((sav)->flags & SADB_X_EXT_OLD) ? \
92 sizeof(struct ah) : sizeof(struct ah) + sizeof(uint32_t))
93 /*
94 * Return authenticator size in bytes. The old protocol is known
95 * to use a fixed 16-byte authenticator. The new algorithm gets
96 * this size from the xform but is (currently) always 12.
97 */
98 #define AUTHSIZE(sav) \
99 ((sav->flags & SADB_X_EXT_OLD) ? 16 : (sav)->tdb_authalgxform->authsize)
100
101 percpu_t *ahstat_percpu;
102
103 int ah_enable = 1; /* control flow of packets with AH */
104 int ip4_ah_cleartos = 1; /* clear ip_tos when doing AH calc */
105
106 #ifdef __FreeBSD__
107 SYSCTL_DECL(_net_inet_ah);
108 SYSCTL_INT(_net_inet_ah, OID_AUTO,
109 ah_enable, CTLFLAG_RW, &ah_enable, 0, "");
110 SYSCTL_INT(_net_inet_ah, OID_AUTO,
111 ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, "");
112 SYSCTL_STRUCT(_net_inet_ah, IPSECCTL_STATS,
113 stats, CTLFLAG_RD, &ahstat, ahstat, "");
114
115 #endif /* __FreeBSD__ */
116
117 static unsigned char ipseczeroes[256]; /* larger than an ip6 extension hdr */
118
119 int ah_max_authsize; /* max authsize over all algorithms */
120
121 static int ah_input_cb(struct cryptop *);
122 static int ah_output_cb(struct cryptop *);
123
124 const uint8_t ah_stats[256] = { SADB_AALG_STATS_INIT };
125
126 static pool_cache_t ah_tdb_crypto_pool_cache;
127 static size_t ah_pool_item_size;
128
129 /*
130 * NB: this is public for use by the PF_KEY support.
131 */
132 const struct auth_hash *
133 ah_algorithm_lookup(int alg)
134 {
135
136 switch (alg) {
137 case SADB_X_AALG_NULL:
138 return &auth_hash_null;
139 case SADB_AALG_MD5HMAC:
140 return &auth_hash_hmac_md5_96;
141 case SADB_AALG_SHA1HMAC:
142 return &auth_hash_hmac_sha1_96;
143 case SADB_X_AALG_RIPEMD160HMAC:
144 return &auth_hash_hmac_ripemd_160_96;
145 case SADB_X_AALG_MD5:
146 return &auth_hash_key_md5;
147 case SADB_X_AALG_SHA:
148 return &auth_hash_key_sha1;
149 case SADB_X_AALG_SHA2_256:
150 return &auth_hash_hmac_sha2_256;
151 case SADB_X_AALG_SHA2_384:
152 return &auth_hash_hmac_sha2_384;
153 case SADB_X_AALG_SHA2_512:
154 return &auth_hash_hmac_sha2_512;
155 case SADB_X_AALG_AES_XCBC_MAC:
156 return &auth_hash_aes_xcbc_mac_96;
157 }
158 return NULL;
159 }
160
161 size_t
162 ah_hdrsiz(const struct secasvar *sav)
163 {
164 size_t size;
165
166 if (sav != NULL) {
167 int authsize;
168 KASSERT(sav->tdb_authalgxform != NULL);
169 /*XXX not right for null algorithm--does it matter??*/
170 authsize = AUTHSIZE(sav);
171 size = roundup(authsize, sizeof(uint32_t)) + HDRSIZE(sav);
172 } else {
173 /* default guess */
174 size = sizeof(struct ah) + sizeof(uint32_t) + ah_max_authsize;
175 }
176 return size;
177 }
178
179 /*
180 * NB: public for use by esp_init.
181 */
182 int
183 ah_init0(struct secasvar *sav, const struct xformsw *xsp,
184 struct cryptoini *cria)
185 {
186 const struct auth_hash *thash;
187 int keylen;
188
189 thash = ah_algorithm_lookup(sav->alg_auth);
190 if (thash == NULL) {
191 DPRINTF(("%s: unsupported authentication algorithm %u\n",
192 __func__, sav->alg_auth));
193 return EINVAL;
194 }
195 /*
196 * Verify the replay state block allocation is consistent with
197 * the protocol type. We check here so we can make assumptions
198 * later during protocol processing.
199 */
200 /* NB: replay state is setup elsewhere (sigh) */
201 if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
202 DPRINTF(("%s: replay state block inconsistency, "
203 "%s algorithm %s replay state\n", __func__,
204 (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
205 sav->replay == NULL ? "without" : "with"));
206 return EINVAL;
207 }
208 if (sav->key_auth == NULL) {
209 DPRINTF(("%s: no authentication key for %s algorithm\n",
210 __func__, thash->name));
211 return EINVAL;
212 }
213 keylen = _KEYLEN(sav->key_auth);
214 if (keylen != thash->keysize && thash->keysize != 0) {
215 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
216 "keysize %d\n", __func__,
217 keylen, thash->name, thash->keysize));
218 return EINVAL;
219 }
220
221 sav->tdb_xform = xsp;
222 sav->tdb_authalgxform = thash;
223
224 /* Initialize crypto session. */
225 memset(cria, 0, sizeof(*cria));
226 cria->cri_alg = sav->tdb_authalgxform->type;
227 cria->cri_klen = _KEYBITS(sav->key_auth);
228 cria->cri_key = _KEYBUF(sav->key_auth);
229
230 return 0;
231 }
232
233 /*
234 * ah_init() is called when an SPI is being set up.
235 */
236 static int
237 ah_init(struct secasvar *sav, const struct xformsw *xsp)
238 {
239 struct cryptoini cria;
240 int error;
241
242 error = ah_init0(sav, xsp, &cria);
243 if (!error)
244 error = crypto_newsession(&sav->tdb_cryptoid,
245 &cria, crypto_support);
246 return error;
247 }
248
249 /*
250 * Paranoia.
251 *
252 * NB: public for use by esp_zeroize (XXX).
253 */
254 int
255 ah_zeroize(struct secasvar *sav)
256 {
257 int err;
258
259 if (sav->key_auth) {
260 explicit_memset(_KEYBUF(sav->key_auth), 0,
261 _KEYLEN(sav->key_auth));
262 }
263
264 err = crypto_freesession(sav->tdb_cryptoid);
265 sav->tdb_cryptoid = 0;
266 sav->tdb_authalgxform = NULL;
267 sav->tdb_xform = NULL;
268 return err;
269 }
270
271 /*
272 * Massage IPv4/IPv6 headers for AH processing.
273 */
274 static int
275 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
276 {
277 struct mbuf *m = *m0;
278 unsigned char *ptr;
279 int off, count;
280
281 #ifdef INET
282 struct ip *ip;
283 #endif /* INET */
284
285 #ifdef INET6
286 struct ip6_ext *ip6e;
287 struct ip6_hdr ip6;
288 struct ip6_rthdr *rh;
289 int alloc, ad, nxt;
290 #endif /* INET6 */
291
292 switch (proto) {
293 #ifdef INET
294 case AF_INET:
295 /*
296 * This is the least painful way of dealing with IPv4 header
297 * and option processing -- just make sure they're in
298 * contiguous memory.
299 */
300 *m0 = m = m_pullup(m, skip);
301 if (m == NULL) {
302 DPRINTF(("%s: m_pullup failed\n", __func__));
303 return ENOBUFS;
304 }
305
306 /* Fix the IP header */
307 ip = mtod(m, struct ip *);
308 if (ip4_ah_cleartos)
309 ip->ip_tos = 0;
310 ip->ip_ttl = 0;
311 ip->ip_sum = 0;
312 ip->ip_off = htons(ntohs(ip->ip_off) & ip4_ah_offsetmask);
313
314 /*
315 * On FreeBSD, ip_off and ip_len assumed in host endian;
316 * they are converted (if necessary) by ip_input().
317 * On NetBSD, ip_off and ip_len are in network byte order.
318 * They must be massaged back to network byte order
319 * before verifying the HMAC. Moreover, on FreeBSD,
320 * we should add `skip' back into the massaged ip_len
321 * (presumably ip_input() deducted it before we got here?)
322 * whereas on NetBSD, we should not.
323 */
324 if (!out) {
325 uint16_t inlen = ntohs(ip->ip_len);
326
327 ip->ip_len = htons(inlen);
328
329 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
330 ip->ip_off &= htons(IP_DF);
331 else
332 ip->ip_off = 0;
333 } else {
334 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
335 ip->ip_off &= htons(IP_DF);
336 else
337 ip->ip_off = 0;
338 }
339
340 ptr = mtod(m, unsigned char *);
341
342 /* IPv4 option processing */
343 for (off = sizeof(struct ip); off < skip;) {
344 if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
345 off + 1 < skip)
346 ;
347 else {
348 DPRINTF(("%s: illegal IPv4 option length for "
349 "option %d\n", __func__, ptr[off]));
350
351 m_freem(m);
352 return EINVAL;
353 }
354
355 switch (ptr[off]) {
356 case IPOPT_EOL:
357 off = skip; /* End the loop. */
358 break;
359
360 case IPOPT_NOP:
361 off++;
362 break;
363
364 case IPOPT_SECURITY: /* 0x82 */
365 case 0x85: /* Extended security. */
366 case 0x86: /* Commercial security. */
367 case 0x94: /* Router alert */
368 case 0x95: /* RFC1770 */
369 /* Sanity check for option length. */
370 if (ptr[off + 1] < 2) {
371 DPRINTF(("%s: illegal IPv4 option "
372 "length for option %d\n", __func__,
373 ptr[off]));
374
375 m_freem(m);
376 return EINVAL;
377 }
378
379 off += ptr[off + 1];
380 break;
381
382 case IPOPT_LSRR:
383 case IPOPT_SSRR:
384 /* Sanity check for option length. */
385 if (ptr[off + 1] < 2) {
386 DPRINTF(("%s: illegal IPv4 option "
387 "length for option %d\n", __func__,
388 ptr[off]));
389
390 m_freem(m);
391 return EINVAL;
392 }
393
394 /*
395 * On output, if we have either of the
396 * source routing options, we should
397 * swap the destination address of the
398 * IP header with the last address
399 * specified in the option, as that is
400 * what the destination's IP header
401 * will look like.
402 */
403 if (out)
404 memcpy(&ip->ip_dst,
405 ptr + off + ptr[off + 1] -
406 sizeof(struct in_addr),
407 sizeof(struct in_addr));
408
409 /* Fall through */
410 default:
411 /* Sanity check for option length. */
412 if (ptr[off + 1] < 2) {
413 DPRINTF(("%s: illegal IPv4 option "
414 "length for option %d\n", __func__,
415 ptr[off]));
416 m_freem(m);
417 return EINVAL;
418 }
419
420 /* Zeroize all other options. */
421 count = ptr[off + 1];
422 memcpy(ptr, ipseczeroes, count);
423 off += count;
424 break;
425 }
426
427 /* Sanity check. */
428 if (off > skip) {
429 DPRINTF(("%s: malformed IPv4 options header\n",
430 __func__));
431
432 m_freem(m);
433 return EINVAL;
434 }
435 }
436
437 break;
438 #endif /* INET */
439
440 #ifdef INET6
441 case AF_INET6: /* Ugly... */
442 /* Copy and "cook" the IPv6 header. */
443 m_copydata(m, 0, sizeof(ip6), &ip6);
444
445 /* We don't do IPv6 Jumbograms. */
446 if (ip6.ip6_plen == 0) {
447 DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
448 m_freem(m);
449 return EMSGSIZE;
450 }
451
452 ip6.ip6_flow = 0;
453 ip6.ip6_hlim = 0;
454 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
455 ip6.ip6_vfc |= IPV6_VERSION;
456
457 /* Scoped address handling. */
458 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
459 ip6.ip6_src.s6_addr16[1] = 0;
460 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
461 ip6.ip6_dst.s6_addr16[1] = 0;
462
463 /* Done with IPv6 header. */
464 m_copyback(m, 0, sizeof(struct ip6_hdr), &ip6);
465
466 /* Let's deal with the remaining headers (if any). */
467 if (skip - sizeof(struct ip6_hdr) > 0) {
468 if (m->m_len <= skip) {
469 ptr = malloc(skip - sizeof(struct ip6_hdr),
470 M_XDATA, M_NOWAIT);
471 if (ptr == NULL) {
472 DPRINTF(("%s: failed to allocate "
473 "memory for IPv6 headers\n",
474 __func__));
475 m_freem(m);
476 return ENOBUFS;
477 }
478
479 /*
480 * Copy all the protocol headers after
481 * the IPv6 header.
482 */
483 m_copydata(m, sizeof(struct ip6_hdr),
484 skip - sizeof(struct ip6_hdr), ptr);
485 alloc = 1;
486 } else {
487 /* No need to allocate memory. */
488 ptr = mtod(m, unsigned char *) +
489 sizeof(struct ip6_hdr);
490 alloc = 0;
491 }
492 } else
493 break;
494
495 nxt = ip6.ip6_nxt & 0xff; /* Next header type. */
496
497 for (off = 0; off < skip - sizeof(struct ip6_hdr);)
498 switch (nxt) {
499 case IPPROTO_HOPOPTS:
500 case IPPROTO_DSTOPTS:
501 ip6e = (struct ip6_ext *) (ptr + off);
502
503 /*
504 * Process the mutable/immutable
505 * options -- borrows heavily from the
506 * KAME code.
507 */
508 for (count = off + sizeof(struct ip6_ext);
509 count < off + ((ip6e->ip6e_len + 1) << 3);) {
510 if (ptr[count] == IP6OPT_PAD1) {
511 count++;
512 continue; /* Skip padding. */
513 }
514
515 /* Sanity check. */
516 if (count > off +
517 ((ip6e->ip6e_len + 1) << 3)) {
518 m_freem(m);
519
520 /* Free, if we allocated. */
521 if (alloc)
522 free(ptr, M_XDATA);
523 return EINVAL;
524 }
525
526 ad = ptr[count + 1];
527
528 /* If mutable option, zeroize. */
529 if (ptr[count] & IP6OPT_MUTABLE)
530 memcpy(ptr + count, ipseczeroes,
531 ptr[count + 1]);
532
533 count += ad;
534
535 /* Sanity check. */
536 if (count >
537 skip - sizeof(struct ip6_hdr)) {
538 m_freem(m);
539
540 /* Free, if we allocated. */
541 if (alloc)
542 free(ptr, M_XDATA);
543 return EINVAL;
544 }
545 }
546
547 /* Advance. */
548 off += ((ip6e->ip6e_len + 1) << 3);
549 nxt = ip6e->ip6e_nxt;
550 break;
551
552 case IPPROTO_ROUTING:
553 /*
554 * Always include routing headers in
555 * computation.
556 */
557 ip6e = (struct ip6_ext *) (ptr + off);
558 rh = (struct ip6_rthdr *)(ptr + off);
559 /*
560 * must adjust content to make it look like
561 * its final form (as seen at the final
562 * destination).
563 * we only know how to massage type 0 routing
564 * header.
565 */
566 if (out && rh->ip6r_type == IPV6_RTHDR_TYPE_0) {
567 struct ip6_rthdr0 *rh0;
568 struct in6_addr *addr, finaldst;
569 int i;
570
571 rh0 = (struct ip6_rthdr0 *)rh;
572 addr = (struct in6_addr *)(rh0 + 1);
573
574 for (i = 0; i < rh0->ip6r0_segleft; i++)
575 in6_clearscope(&addr[i]);
576
577 finaldst = addr[rh0->ip6r0_segleft - 1];
578 memmove(&addr[1], &addr[0],
579 sizeof(struct in6_addr) *
580 (rh0->ip6r0_segleft - 1));
581
582 m_copydata(m, 0, sizeof(ip6), &ip6);
583 addr[0] = ip6.ip6_dst;
584 ip6.ip6_dst = finaldst;
585 m_copyback(m, 0, sizeof(ip6), &ip6);
586
587 rh0->ip6r0_segleft = 0;
588 }
589
590 /* advance */
591 off += ((ip6e->ip6e_len + 1) << 3);
592 nxt = ip6e->ip6e_nxt;
593 break;
594
595 default:
596 DPRINTF(("%s: unexpected IPv6 header type %d\n",
597 __func__, off));
598 if (alloc)
599 free(ptr, M_XDATA);
600 m_freem(m);
601 return EINVAL;
602 }
603
604 /* Copyback and free, if we allocated. */
605 if (alloc) {
606 m_copyback(m, sizeof(struct ip6_hdr),
607 skip - sizeof(struct ip6_hdr), ptr);
608 free(ptr, M_XDATA);
609 }
610
611 break;
612 #endif /* INET6 */
613 }
614
615 return 0;
616 }
617
618 /*
619 * ah_input() gets called to verify that an input packet
620 * passes authentication.
621 */
622 static int
623 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
624 {
625 const struct auth_hash *ahx;
626 struct tdb_crypto *tc = NULL;
627 struct newah *ah;
628 int hl, rplen, authsize, error, stat = AH_STAT_HDROPS;
629 struct cryptodesc *crda;
630 struct cryptop *crp = NULL;
631
632 IPSEC_SPLASSERT_SOFTNET(__func__);
633
634 KASSERT(sav != NULL);
635 KASSERT(sav->key_auth != NULL);
636 KASSERT(sav->tdb_authalgxform != NULL);
637
638 /* Figure out header size. */
639 rplen = HDRSIZE(sav);
640
641 /* XXX don't pullup, just copy header */
642 IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
643 if (ah == NULL) {
644 DPRINTF(("%s: cannot pullup header\n", __func__));
645 error = ENOBUFS;
646 stat = AH_STAT_HDROPS; /*XXX*/
647 goto bad;
648 }
649
650 /* Check replay window, if applicable. */
651 if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
652 char buf[IPSEC_LOGSASTRLEN];
653 DPRINTF(("%s: packet replay failure: %s\n", __func__,
654 ipsec_logsastr(sav, buf, sizeof(buf))));
655 stat = AH_STAT_REPLAY;
656 error = ENOBUFS;
657 goto bad;
658 }
659
660 /* Verify AH header length. */
661 hl = ah->ah_len * sizeof(uint32_t);
662 ahx = sav->tdb_authalgxform;
663 authsize = AUTHSIZE(sav);
664 if (hl != authsize + rplen - sizeof(struct ah)) {
665 char buf[IPSEC_ADDRSTRLEN];
666 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
667 " for packet in SA %s/%08lx\n", __func__,
668 hl, (u_long) (authsize + rplen - sizeof(struct ah)),
669 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
670 (u_long) ntohl(sav->spi)));
671 stat = AH_STAT_BADAUTHL;
672 error = EACCES;
673 goto bad;
674 }
675 AH_STATADD(AH_STAT_IBYTES, m->m_pkthdr.len - skip - hl);
676
677 /* Get crypto descriptors. */
678 crp = crypto_getreq(1);
679 if (crp == NULL) {
680 DPRINTF(("%s: failed to acquire crypto descriptor\n", __func__));
681 stat = AH_STAT_CRYPTO;
682 error = ENOBUFS;
683 goto bad;
684 }
685
686 crda = crp->crp_desc;
687 KASSERT(crda != NULL);
688
689 crda->crd_skip = 0;
690 crda->crd_len = m->m_pkthdr.len;
691 crda->crd_inject = skip + rplen;
692
693 /* Authentication operation. */
694 crda->crd_alg = ahx->type;
695 crda->crd_key = _KEYBUF(sav->key_auth);
696 crda->crd_klen = _KEYBITS(sav->key_auth);
697
698 /* Allocate IPsec-specific opaque crypto info. */
699 size_t size = sizeof(*tc);
700 size_t extra = skip + rplen + authsize;
701 size += extra;
702
703 KASSERTMSG(size <= ah_pool_item_size,
704 "size=%zu > ah_pool_item_size=%zu\n", size, ah_pool_item_size);
705 tc = pool_cache_get(ah_tdb_crypto_pool_cache, PR_NOWAIT);
706 if (tc == NULL) {
707 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
708 stat = AH_STAT_CRYPTO;
709 error = ENOBUFS;
710 goto bad;
711 }
712
713 error = m_makewritable(&m, 0, extra, M_NOWAIT);
714 if (error) {
715 DPRINTF(("%s: failed to m_makewritable\n", __func__));
716 goto bad;
717 }
718
719 /*
720 * Save the authenticator, the skipped portion of the packet,
721 * and the AH header.
722 */
723 m_copydata(m, 0, extra, (tc + 1));
724 /* Zeroize the authenticator on the packet. */
725 m_copyback(m, skip + rplen, authsize, ipseczeroes);
726
727 /* "Massage" the packet headers for crypto processing. */
728 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
729 skip, ahx->type, 0);
730 if (error != 0) {
731 /* NB: mbuf is free'd by ah_massage_headers */
732 m = NULL;
733 goto bad;
734 }
735
736 {
737 int s = pserialize_read_enter();
738
739 /*
740 * Take another reference to the SA for opencrypto callback.
741 */
742 if (__predict_false(sav->state == SADB_SASTATE_DEAD)) {
743 pserialize_read_exit(s);
744 stat = AH_STAT_NOTDB;
745 error = ENOENT;
746 goto bad;
747 }
748 KEY_SA_REF(sav);
749 pserialize_read_exit(s);
750 }
751
752 /* Crypto operation descriptor. */
753 crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
754 crp->crp_flags = CRYPTO_F_IMBUF;
755 crp->crp_buf = m;
756 crp->crp_callback = ah_input_cb;
757 crp->crp_sid = sav->tdb_cryptoid;
758 crp->crp_opaque = tc;
759
760 /* These are passed as-is to the callback. */
761 tc->tc_spi = sav->spi;
762 tc->tc_dst = sav->sah->saidx.dst;
763 tc->tc_proto = sav->sah->saidx.proto;
764 tc->tc_nxt = ah->ah_nxt;
765 tc->tc_protoff = protoff;
766 tc->tc_skip = skip;
767 tc->tc_sav = sav;
768
769 DPRINTF(("%s: hash over %d bytes, skip %d: "
770 "crda len %d skip %d inject %d\n", __func__,
771 crp->crp_ilen, tc->tc_skip,
772 crda->crd_len, crda->crd_skip, crda->crd_inject));
773
774 return crypto_dispatch(crp);
775
776 bad:
777 if (tc != NULL)
778 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
779 if (crp != NULL)
780 crypto_freereq(crp);
781 if (m != NULL)
782 m_freem(m);
783 AH_STATINC(stat);
784 return error;
785 }
786
787 #ifdef INET6
788 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do { \
789 if (saidx->dst.sa.sa_family == AF_INET6) { \
790 error = ipsec6_common_input_cb(m, sav, skip, protoff); \
791 } else { \
792 error = ipsec4_common_input_cb(m, sav, skip, protoff); \
793 } \
794 } while (0)
795 #else
796 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) \
797 (error = ipsec4_common_input_cb(m, sav, skip, protoff))
798 #endif
799
800 /*
801 * AH input callback from the crypto driver.
802 */
803 static int
804 ah_input_cb(struct cryptop *crp)
805 {
806 char buf[IPSEC_ADDRSTRLEN];
807 int rplen, error, skip, protoff;
808 unsigned char calc[AH_ALEN_MAX];
809 struct mbuf *m;
810 struct tdb_crypto *tc;
811 struct secasvar *sav;
812 struct secasindex *saidx;
813 uint8_t nxt;
814 char *ptr;
815 int authsize;
816 uint16_t dport;
817 uint16_t sport;
818 IPSEC_DECLARE_LOCK_VARIABLE;
819
820 KASSERT(crp->crp_opaque != NULL);
821 tc = crp->crp_opaque;
822 skip = tc->tc_skip;
823 nxt = tc->tc_nxt;
824 protoff = tc->tc_protoff;
825 m = crp->crp_buf;
826
827
828 /* find the source port for NAT-T */
829 nat_t_ports_get(m, &dport, &sport);
830
831 IPSEC_ACQUIRE_GLOBAL_LOCKS();
832
833 sav = tc->tc_sav;
834 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) {
835 KEY_SA_UNREF(&sav);
836 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi,
837 sport, dport);
838 if (sav == NULL) {
839 AH_STATINC(AH_STAT_NOTDB);
840 DPRINTF(("%s: SA expired while in crypto\n", __func__));
841 error = ENOBUFS; /*XXX*/
842 goto bad;
843 }
844 }
845
846 saidx = &sav->sah->saidx;
847 KASSERTMSG(saidx->dst.sa.sa_family == AF_INET ||
848 saidx->dst.sa.sa_family == AF_INET6,
849 "unexpected protocol family %u", saidx->dst.sa.sa_family);
850
851 /* Check for crypto errors. */
852 if (crp->crp_etype) {
853 if (sav->tdb_cryptoid != 0)
854 sav->tdb_cryptoid = crp->crp_sid;
855
856 if (crp->crp_etype == EAGAIN) {
857 IPSEC_RELEASE_GLOBAL_LOCKS();
858 return crypto_dispatch(crp);
859 }
860
861 AH_STATINC(AH_STAT_NOXFORM);
862 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
863 error = crp->crp_etype;
864 goto bad;
865 } else {
866 AH_STATINC(AH_STAT_HIST + ah_stats[sav->alg_auth]);
867 crypto_freereq(crp); /* No longer needed. */
868 crp = NULL;
869 }
870
871 /* Figure out header size. */
872 rplen = HDRSIZE(sav);
873 authsize = AUTHSIZE(sav);
874
875 if (ipsec_debug)
876 memset(calc, 0, sizeof(calc));
877
878 /* Copy authenticator off the packet. */
879 m_copydata(m, skip + rplen, authsize, calc);
880
881 ptr = (char *)(tc + 1);
882 const uint8_t *pppp = ptr + skip + rplen;
883
884 /* Verify authenticator. */
885 if (!consttime_memequal(pppp, calc, authsize)) {
886 DPRINTF(("%s: authentication hash mismatch " \
887 "over %d bytes " \
888 "for packet in SA %s/%08lx:\n" \
889 "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x, " \
890 "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
891 __func__, authsize,
892 ipsec_address(&saidx->dst, buf, sizeof(buf)),
893 (u_long) ntohl(sav->spi),
894 calc[0], calc[1], calc[2], calc[3],
895 calc[4], calc[5], calc[6], calc[7],
896 calc[8], calc[9], calc[10], calc[11],
897 pppp[0], pppp[1], pppp[2], pppp[3],
898 pppp[4], pppp[5], pppp[6], pppp[7],
899 pppp[8], pppp[9], pppp[10], pppp[11]
900 ));
901 AH_STATINC(AH_STAT_BADAUTH);
902 error = EACCES;
903 goto bad;
904 }
905
906 /* Fix the Next Protocol field. */
907 ptr[protoff] = nxt;
908
909 /* Copyback the saved (uncooked) network headers. */
910 m_copyback(m, 0, skip, ptr);
911
912 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
913 tc = NULL;
914
915 /*
916 * Header is now authenticated.
917 */
918 m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
919
920 /*
921 * Update replay sequence number, if appropriate.
922 */
923 if (sav->replay) {
924 uint32_t seq;
925
926 m_copydata(m, skip + offsetof(struct newah, ah_seq),
927 sizeof(seq), &seq);
928 if (ipsec_updatereplay(ntohl(seq), sav)) {
929 AH_STATINC(AH_STAT_REPLAY);
930 error = ENOBUFS; /*XXX as above*/
931 goto bad;
932 }
933 }
934
935 /*
936 * Remove the AH header and authenticator from the mbuf.
937 */
938 error = m_striphdr(m, skip, rplen + authsize);
939 if (error) {
940 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
941 ipsec_address(&saidx->dst, buf, sizeof(buf)),
942 (u_long) ntohl(sav->spi)));
943
944 AH_STATINC(AH_STAT_HDROPS);
945 goto bad;
946 }
947
948 IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff);
949
950 KEY_SA_UNREF(&sav);
951 IPSEC_RELEASE_GLOBAL_LOCKS();
952 return error;
953 bad:
954 if (sav)
955 KEY_SA_UNREF(&sav);
956 IPSEC_RELEASE_GLOBAL_LOCKS();
957 if (m != NULL)
958 m_freem(m);
959 if (tc != NULL)
960 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
961 if (crp != NULL)
962 crypto_freereq(crp);
963 return error;
964 }
965
966 /*
967 * AH output routine, called by ipsec[46]_process_packet().
968 */
969 static int
970 ah_output(
971 struct mbuf *m,
972 struct ipsecrequest *isr,
973 struct secasvar *sav,
974 struct mbuf **mp,
975 int skip,
976 int protoff
977 )
978 {
979 char buf[IPSEC_ADDRSTRLEN];
980 const struct auth_hash *ahx;
981 struct cryptodesc *crda;
982 struct tdb_crypto *tc;
983 struct mbuf *mi;
984 struct cryptop *crp;
985 uint16_t iplen;
986 int error, rplen, authsize, maxpacketsize, roff;
987 uint8_t prot;
988 struct newah *ah;
989
990 IPSEC_SPLASSERT_SOFTNET(__func__);
991
992 KASSERT(sav != NULL);
993 KASSERT(sav->tdb_authalgxform != NULL);
994 ahx = sav->tdb_authalgxform;
995
996 AH_STATINC(AH_STAT_OUTPUT);
997
998 /* Figure out header size. */
999 rplen = HDRSIZE(sav);
1000
1001 size_t ipoffs;
1002 /* Check for maximum packet size violations. */
1003 switch (sav->sah->saidx.dst.sa.sa_family) {
1004 #ifdef INET
1005 case AF_INET:
1006 maxpacketsize = IP_MAXPACKET;
1007 ipoffs = offsetof(struct ip, ip_len);
1008 break;
1009 #endif /* INET */
1010 #ifdef INET6
1011 case AF_INET6:
1012 maxpacketsize = IPV6_MAXPACKET;
1013 ipoffs = offsetof(struct ip6_hdr, ip6_plen);
1014 break;
1015 #endif /* INET6 */
1016 default:
1017 DPRINTF(("%s: unknown/unsupported protocol "
1018 "family %u, SA %s/%08lx\n", __func__,
1019 sav->sah->saidx.dst.sa.sa_family,
1020 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
1021 (u_long) ntohl(sav->spi)));
1022 AH_STATINC(AH_STAT_NOPF);
1023 error = EPFNOSUPPORT;
1024 goto bad;
1025 }
1026 authsize = AUTHSIZE(sav);
1027 if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
1028 DPRINTF(("%s: packet in SA %s/%08lx got too big "
1029 "(len %u, max len %u)\n", __func__,
1030 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
1031 (u_long) ntohl(sav->spi),
1032 rplen + authsize + m->m_pkthdr.len, maxpacketsize));
1033 AH_STATINC(AH_STAT_TOOBIG);
1034 error = EMSGSIZE;
1035 goto bad;
1036 }
1037
1038 /* Update the counters. */
1039 AH_STATADD(AH_STAT_OBYTES, m->m_pkthdr.len - skip);
1040
1041 m = m_clone(m);
1042 if (m == NULL) {
1043 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
1044 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
1045 (u_long) ntohl(sav->spi)));
1046 AH_STATINC(AH_STAT_HDROPS);
1047 error = ENOBUFS;
1048 goto bad;
1049 }
1050
1051 /* Inject AH header. */
1052 mi = m_makespace(m, skip, rplen + authsize, &roff);
1053 if (mi == NULL) {
1054 DPRINTF(("%s: failed to inject %u byte AH header for SA "
1055 "%s/%08lx\n", __func__,
1056 rplen + authsize,
1057 ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
1058 (u_long) ntohl(sav->spi)));
1059 AH_STATINC(AH_STAT_HDROPS); /*XXX differs from openbsd */
1060 error = ENOBUFS;
1061 goto bad;
1062 }
1063
1064 /*
1065 * The AH header is guaranteed by m_makespace() to be in
1066 * contiguous memory, at roff bytes offset into the returned mbuf.
1067 */
1068 ah = (struct newah *)(mtod(mi, char *) + roff);
1069
1070 /* Initialize the AH header. */
1071 m_copydata(m, protoff, sizeof(uint8_t), &ah->ah_nxt);
1072 ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(uint32_t);
1073 ah->ah_reserve = 0;
1074 ah->ah_spi = sav->spi;
1075
1076 /* Zeroize authenticator. */
1077 m_copyback(m, skip + rplen, authsize, ipseczeroes);
1078
1079 /* Insert packet replay counter, as requested. */
1080 if (sav->replay) {
1081 if (sav->replay->count == ~0 &&
1082 (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
1083 DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
1084 __func__, ipsec_address(&sav->sah->saidx.dst, buf,
1085 sizeof(buf)), (u_long) ntohl(sav->spi)));
1086 AH_STATINC(AH_STAT_WRAP);
1087 error = EINVAL;
1088 goto bad;
1089 }
1090 #ifdef IPSEC_DEBUG
1091 /* Emulate replay attack when ipsec_replay is TRUE. */
1092 if (!ipsec_replay)
1093 #endif
1094 sav->replay->count++;
1095 ah->ah_seq = htonl(sav->replay->count);
1096 }
1097
1098 /* Get crypto descriptors. */
1099 crp = crypto_getreq(1);
1100 if (crp == NULL) {
1101 DPRINTF(("%s: failed to acquire crypto descriptors\n",
1102 __func__));
1103 AH_STATINC(AH_STAT_CRYPTO);
1104 error = ENOBUFS;
1105 goto bad;
1106 }
1107
1108 crda = crp->crp_desc;
1109
1110 crda->crd_skip = 0;
1111 crda->crd_inject = skip + rplen;
1112 crda->crd_len = m->m_pkthdr.len;
1113
1114 /* Authentication operation. */
1115 crda->crd_alg = ahx->type;
1116 crda->crd_key = _KEYBUF(sav->key_auth);
1117 crda->crd_klen = _KEYBITS(sav->key_auth);
1118
1119 /* Allocate IPsec-specific opaque crypto info. */
1120 tc = pool_cache_get(ah_tdb_crypto_pool_cache, PR_NOWAIT);
1121 if (tc == NULL) {
1122 crypto_freereq(crp);
1123 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
1124 AH_STATINC(AH_STAT_CRYPTO);
1125 error = ENOBUFS;
1126 goto bad;
1127 }
1128
1129 uint8_t *pext = (char *)(tc + 1);
1130 /* Save the skipped portion of the packet. */
1131 m_copydata(m, 0, skip, pext);
1132
1133 /*
1134 * Fix IP header length on the header used for
1135 * authentication. We don't need to fix the original
1136 * header length as it will be fixed by our caller.
1137 */
1138 memcpy(&iplen, pext + ipoffs, sizeof(iplen));
1139 iplen = htons(ntohs(iplen) + rplen + authsize);
1140 m_copyback(m, ipoffs, sizeof(iplen), &iplen);
1141
1142 /* Fix the Next Header field in saved header. */
1143 pext[protoff] = IPPROTO_AH;
1144
1145 /* Update the Next Protocol field in the IP header. */
1146 prot = IPPROTO_AH;
1147 m_copyback(m, protoff, sizeof(prot), &prot);
1148
1149 /* "Massage" the packet headers for crypto processing. */
1150 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
1151 skip, ahx->type, 1);
1152 if (error != 0) {
1153 m = NULL; /* mbuf was free'd by ah_massage_headers. */
1154 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
1155 crypto_freereq(crp);
1156 goto bad;
1157 }
1158
1159 {
1160 int s = pserialize_read_enter();
1161
1162 /*
1163 * Take another reference to the SP and the SA for opencrypto callback.
1164 */
1165 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD ||
1166 sav->state == SADB_SASTATE_DEAD)) {
1167 pserialize_read_exit(s);
1168 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
1169 crypto_freereq(crp);
1170 AH_STATINC(AH_STAT_NOTDB);
1171 error = ENOENT;
1172 goto bad;
1173 }
1174 KEY_SP_REF(isr->sp);
1175 KEY_SA_REF(sav);
1176 pserialize_read_exit(s);
1177 }
1178
1179 /* Crypto operation descriptor. */
1180 crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
1181 crp->crp_flags = CRYPTO_F_IMBUF;
1182 crp->crp_buf = m;
1183 crp->crp_callback = ah_output_cb;
1184 crp->crp_sid = sav->tdb_cryptoid;
1185 crp->crp_opaque = tc;
1186
1187 /* These are passed as-is to the callback. */
1188 tc->tc_isr = isr;
1189 tc->tc_spi = sav->spi;
1190 tc->tc_dst = sav->sah->saidx.dst;
1191 tc->tc_proto = sav->sah->saidx.proto;
1192 tc->tc_skip = skip;
1193 tc->tc_protoff = protoff;
1194 tc->tc_sav = sav;
1195
1196 return crypto_dispatch(crp);
1197 bad:
1198 if (m)
1199 m_freem(m);
1200 return (error);
1201 }
1202
1203 /*
1204 * AH output callback from the crypto driver.
1205 */
1206 static int
1207 ah_output_cb(struct cryptop *crp)
1208 {
1209 int skip, error;
1210 struct tdb_crypto *tc;
1211 struct ipsecrequest *isr;
1212 struct secasvar *sav;
1213 struct mbuf *m;
1214 void *ptr;
1215 int err;
1216 IPSEC_DECLARE_LOCK_VARIABLE;
1217
1218 KASSERT(crp->crp_opaque != NULL);
1219 tc = crp->crp_opaque;
1220 skip = tc->tc_skip;
1221 ptr = (tc + 1);
1222 m = crp->crp_buf;
1223
1224 IPSEC_ACQUIRE_GLOBAL_LOCKS();
1225
1226 isr = tc->tc_isr;
1227 sav = tc->tc_sav;
1228 if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD)) {
1229 AH_STATINC(AH_STAT_NOTDB);
1230 IPSECLOG(LOG_DEBUG,
1231 "SP is being destroyed while in crypto (id=%u)\n",
1232 isr->sp->id);
1233 error = ENOENT;
1234 goto bad;
1235 }
1236 if (__predict_false(!SADB_SASTATE_USABLE_P(sav))) {
1237 KEY_SA_UNREF(&sav);
1238 sav = KEY_LOOKUP_SA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0);
1239 if (sav == NULL) {
1240 AH_STATINC(AH_STAT_NOTDB);
1241 DPRINTF(("%s: SA expired while in crypto\n", __func__));
1242 error = ENOBUFS; /*XXX*/
1243 goto bad;
1244 }
1245 }
1246
1247 /* Check for crypto errors. */
1248 if (crp->crp_etype) {
1249 if (sav->tdb_cryptoid != 0)
1250 sav->tdb_cryptoid = crp->crp_sid;
1251
1252 if (crp->crp_etype == EAGAIN) {
1253 IPSEC_RELEASE_GLOBAL_LOCKS();
1254 return crypto_dispatch(crp);
1255 }
1256
1257 AH_STATINC(AH_STAT_NOXFORM);
1258 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
1259 error = crp->crp_etype;
1260 goto bad;
1261 }
1262
1263 AH_STATINC(AH_STAT_HIST + ah_stats[sav->alg_auth]);
1264
1265 /*
1266 * Copy original headers (with the new protocol number) back
1267 * in place.
1268 */
1269 m_copyback(m, 0, skip, ptr);
1270
1271 /* No longer needed. */
1272 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
1273 crypto_freereq(crp);
1274
1275 #ifdef IPSEC_DEBUG
1276 /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
1277 if (ipsec_integrity) {
1278 int alen;
1279
1280 /*
1281 * Corrupt HMAC if we want to test integrity verification of
1282 * the other side.
1283 */
1284 alen = AUTHSIZE(sav);
1285 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
1286 }
1287 #endif
1288
1289 /* NB: m is reclaimed by ipsec_process_done. */
1290 err = ipsec_process_done(m, isr, sav);
1291 KEY_SA_UNREF(&sav);
1292 KEY_SP_UNREF(&isr->sp);
1293 IPSEC_RELEASE_GLOBAL_LOCKS();
1294 return err;
1295 bad:
1296 if (sav)
1297 KEY_SA_UNREF(&sav);
1298 KEY_SP_UNREF(&isr->sp);
1299 IPSEC_RELEASE_GLOBAL_LOCKS();
1300 if (m)
1301 m_freem(m);
1302 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
1303 crypto_freereq(crp);
1304 return error;
1305 }
1306
1307 static struct xformsw ah_xformsw = {
1308 .xf_type = XF_AH,
1309 .xf_flags = XFT_AUTH,
1310 .xf_name = "IPsec AH",
1311 .xf_init = ah_init,
1312 .xf_zeroize = ah_zeroize,
1313 .xf_input = ah_input,
1314 .xf_output = ah_output,
1315 .xf_next = NULL,
1316 };
1317
1318 void
1319 ah_attach(void)
1320 {
1321 ahstat_percpu = percpu_alloc(sizeof(uint64_t) * AH_NSTATS);
1322
1323 #define MAXAUTHSIZE(name) \
1324 if ((auth_hash_ ## name).authsize > ah_max_authsize) \
1325 ah_max_authsize = (auth_hash_ ## name).authsize
1326
1327 ah_max_authsize = 0;
1328 MAXAUTHSIZE(null);
1329 MAXAUTHSIZE(md5);
1330 MAXAUTHSIZE(sha1);
1331 MAXAUTHSIZE(key_md5);
1332 MAXAUTHSIZE(key_sha1);
1333 MAXAUTHSIZE(hmac_md5);
1334 MAXAUTHSIZE(hmac_sha1);
1335 MAXAUTHSIZE(hmac_ripemd_160);
1336 MAXAUTHSIZE(hmac_md5_96);
1337 MAXAUTHSIZE(hmac_sha1_96);
1338 MAXAUTHSIZE(hmac_ripemd_160_96);
1339 MAXAUTHSIZE(hmac_sha2_256);
1340 MAXAUTHSIZE(hmac_sha2_384);
1341 MAXAUTHSIZE(hmac_sha2_512);
1342 MAXAUTHSIZE(aes_xcbc_mac_96);
1343 MAXAUTHSIZE(gmac_aes_128);
1344 MAXAUTHSIZE(gmac_aes_192);
1345 MAXAUTHSIZE(gmac_aes_256);
1346 IPSECLOG(LOG_DEBUG, "ah_max_authsize=%d\n", ah_max_authsize);
1347
1348 #undef MAXAUTHSIZE
1349
1350 ah_pool_item_size = sizeof(struct tdb_crypto) +
1351 sizeof(struct ip) + MAX_IPOPTLEN +
1352 sizeof(struct ah) + sizeof(uint32_t) + ah_max_authsize;
1353 ah_tdb_crypto_pool_cache = pool_cache_init(ah_pool_item_size,
1354 coherency_unit, 0, 0, "ah_tdb_crypto", NULL, IPL_SOFTNET,
1355 NULL, NULL, NULL);
1356
1357 xform_register(&ah_xformsw);
1358 }
1359