| 1 | /* $NetBSD: xform_esp.c,v 1.46 2015/03/30 03:51:50 ozaki-r Exp $ */ |
| 2 | /* $FreeBSD: src/sys/netipsec/xform_esp.c,v 1.2.2.1 2003/01/24 05:11:36 sam Exp $ */ |
| 3 | /* $OpenBSD: ip_esp.c,v 1.69 2001/06/26 06:18:59 angelos Exp $ */ |
| 4 | |
| 5 | /* |
| 6 | * The authors of this code are John Ioannidis (ji@tla.org), |
| 7 | * Angelos D. Keromytis (kermit@csd.uch.gr) and |
| 8 | * Niels Provos (provos@physnet.uni-hamburg.de). |
| 9 | * |
| 10 | * The original version of this code was written by John Ioannidis |
| 11 | * for BSD/OS in Athens, Greece, in November 1995. |
| 12 | * |
| 13 | * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, |
| 14 | * by Angelos D. Keromytis. |
| 15 | * |
| 16 | * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis |
| 17 | * and Niels Provos. |
| 18 | * |
| 19 | * Additional features in 1999 by Angelos D. Keromytis. |
| 20 | * |
| 21 | * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, |
| 22 | * Angelos D. Keromytis and Niels Provos. |
| 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_esp.c,v 1.46 2015/03/30 03:51:50 ozaki-r Exp $" ); |
| 43 | |
| 44 | #include "opt_inet.h" |
| 45 | #ifdef __FreeBSD__ |
| 46 | #include "opt_inet6.h" |
| 47 | #endif |
| 48 | #include "opt_ipsec.h" |
| 49 | |
| 50 | #include <sys/param.h> |
| 51 | #include <sys/systm.h> |
| 52 | #include <sys/mbuf.h> |
| 53 | #include <sys/socket.h> |
| 54 | #include <sys/syslog.h> |
| 55 | #include <sys/kernel.h> |
| 56 | /*#include <sys/random.h>*/ |
| 57 | #include <sys/sysctl.h> |
| 58 | #include <sys/socketvar.h> /* for softnet_lock */ |
| 59 | |
| 60 | #include <net/if.h> |
| 61 | |
| 62 | #include <netinet/in.h> |
| 63 | #include <netinet/in_systm.h> |
| 64 | #include <netinet/ip.h> |
| 65 | #include <netinet/ip_ecn.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/esp.h> |
| 74 | #include <netipsec/esp_var.h> |
| 75 | #include <netipsec/xform.h> |
| 76 | |
| 77 | #ifdef INET6 |
| 78 | #include <netinet6/ip6_var.h> |
| 79 | #include <netipsec/ipsec6.h> |
| 80 | # ifdef __FreeBSD__ |
| 81 | # include <netinet6/ip6_ecn.h> |
| 82 | # endif |
| 83 | #endif |
| 84 | |
| 85 | #include <netipsec/key.h> |
| 86 | #include <netipsec/key_debug.h> |
| 87 | |
| 88 | #include <netipsec/ipsec_osdep.h> |
| 89 | |
| 90 | #include <opencrypto/cryptodev.h> |
| 91 | #include <opencrypto/xform.h> |
| 92 | |
| 93 | percpu_t *espstat_percpu; |
| 94 | |
| 95 | int esp_enable = 1; |
| 96 | |
| 97 | #ifdef __FreeBSD__ |
| 98 | SYSCTL_DECL(_net_inet_esp); |
| 99 | SYSCTL_INT(_net_inet_esp, OID_AUTO, |
| 100 | esp_enable, CTLFLAG_RW, &esp_enable, 0, "" ); |
| 101 | SYSCTL_STRUCT(_net_inet_esp, IPSECCTL_STATS, |
| 102 | stats, CTLFLAG_RD, &espstat, espstat, "" ); |
| 103 | #endif /* __FreeBSD__ */ |
| 104 | |
| 105 | static int esp_max_ivlen; /* max iv length over all algorithms */ |
| 106 | |
| 107 | static int esp_input_cb(struct cryptop *op); |
| 108 | static int esp_output_cb(struct cryptop *crp); |
| 109 | |
| 110 | /* |
| 111 | * NB: this is public for use by the PF_KEY support. |
| 112 | * NB: if you add support here; be sure to add code to esp_attach below! |
| 113 | */ |
| 114 | const struct enc_xform * |
| 115 | esp_algorithm_lookup(int alg) |
| 116 | { |
| 117 | if (alg >= ESP_ALG_MAX) |
| 118 | return NULL; |
| 119 | switch (alg) { |
| 120 | case SADB_EALG_DESCBC: |
| 121 | return &enc_xform_des; |
| 122 | case SADB_EALG_3DESCBC: |
| 123 | return &enc_xform_3des; |
| 124 | case SADB_X_EALG_AES: |
| 125 | return &enc_xform_rijndael128; |
| 126 | case SADB_X_EALG_BLOWFISHCBC: |
| 127 | return &enc_xform_blf; |
| 128 | case SADB_X_EALG_CAST128CBC: |
| 129 | return &enc_xform_cast5; |
| 130 | case SADB_X_EALG_SKIPJACK: |
| 131 | return &enc_xform_skipjack; |
| 132 | case SADB_X_EALG_CAMELLIACBC: |
| 133 | return &enc_xform_camellia; |
| 134 | case SADB_X_EALG_AESCTR: |
| 135 | return &enc_xform_aes_ctr; |
| 136 | case SADB_X_EALG_AESGCM16: |
| 137 | return &enc_xform_aes_gcm; |
| 138 | case SADB_X_EALG_AESGMAC: |
| 139 | return &enc_xform_aes_gmac; |
| 140 | case SADB_EALG_NULL: |
| 141 | return &enc_xform_null; |
| 142 | } |
| 143 | return NULL; |
| 144 | } |
| 145 | |
| 146 | size_t |
| 147 | esp_hdrsiz(const struct secasvar *sav) |
| 148 | { |
| 149 | size_t size; |
| 150 | |
| 151 | if (sav != NULL) { |
| 152 | /*XXX not right for null algorithm--does it matter??*/ |
| 153 | IPSEC_ASSERT(sav->tdb_encalgxform != NULL, |
| 154 | ("esp_hdrsiz: SA with null xform" )); |
| 155 | if (sav->flags & SADB_X_EXT_OLD) |
| 156 | size = sizeof (struct esp); |
| 157 | else |
| 158 | size = sizeof (struct newesp); |
| 159 | size += sav->tdb_encalgxform->ivsize + 9; |
| 160 | /*XXX need alg check???*/ |
| 161 | if (sav->tdb_authalgxform != NULL && sav->replay) |
| 162 | size += ah_hdrsiz(sav); |
| 163 | } else { |
| 164 | /* |
| 165 | * base header size |
| 166 | * + max iv length for CBC mode |
| 167 | * + max pad length |
| 168 | * + sizeof (pad length field) |
| 169 | * + sizeof (next header field) |
| 170 | * + max icv supported. |
| 171 | */ |
| 172 | size = sizeof (struct newesp) + esp_max_ivlen + 9 + 16; |
| 173 | } |
| 174 | return size; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * esp_init() is called when an SPI is being set up. |
| 179 | */ |
| 180 | static int |
| 181 | esp_init(struct secasvar *sav, const struct xformsw *xsp) |
| 182 | { |
| 183 | const struct enc_xform *txform; |
| 184 | struct cryptoini cria, crie; |
| 185 | int keylen; |
| 186 | int error; |
| 187 | |
| 188 | txform = esp_algorithm_lookup(sav->alg_enc); |
| 189 | if (txform == NULL) { |
| 190 | DPRINTF(("esp_init: unsupported encryption algorithm %d\n" , |
| 191 | sav->alg_enc)); |
| 192 | return EINVAL; |
| 193 | } |
| 194 | if (sav->key_enc == NULL) { |
| 195 | DPRINTF(("esp_init: no encoding key for %s algorithm\n" , |
| 196 | txform->name)); |
| 197 | return EINVAL; |
| 198 | } |
| 199 | if ((sav->flags&(SADB_X_EXT_OLD|SADB_X_EXT_IV4B)) == SADB_X_EXT_IV4B) { |
| 200 | DPRINTF(("esp_init: 4-byte IV not supported with protocol\n" )); |
| 201 | return EINVAL; |
| 202 | } |
| 203 | keylen = _KEYLEN(sav->key_enc); |
| 204 | if (txform->minkey > keylen || keylen > txform->maxkey) { |
| 205 | DPRINTF(("esp_init: invalid key length %u, must be in " |
| 206 | "the range [%u..%u] for algorithm %s\n" , |
| 207 | keylen, txform->minkey, txform->maxkey, |
| 208 | txform->name)); |
| 209 | return EINVAL; |
| 210 | } |
| 211 | |
| 212 | sav->ivlen = txform->ivsize; |
| 213 | |
| 214 | /* |
| 215 | * Setup AH-related state. |
| 216 | */ |
| 217 | if (sav->alg_auth != 0) { |
| 218 | error = ah_init0(sav, xsp, &cria); |
| 219 | if (error) |
| 220 | return error; |
| 221 | } |
| 222 | |
| 223 | /* NB: override anything set in ah_init0 */ |
| 224 | sav->tdb_xform = xsp; |
| 225 | sav->tdb_encalgxform = txform; |
| 226 | |
| 227 | if (sav->alg_enc == SADB_X_EALG_AESGCM16 || |
| 228 | sav->alg_enc == SADB_X_EALG_AESGMAC) { |
| 229 | switch (keylen) { |
| 230 | case 20: |
| 231 | sav->alg_auth = SADB_X_AALG_AES128GMAC; |
| 232 | sav->tdb_authalgxform = &auth_hash_gmac_aes_128; |
| 233 | break; |
| 234 | case 28: |
| 235 | sav->alg_auth = SADB_X_AALG_AES192GMAC; |
| 236 | sav->tdb_authalgxform = &auth_hash_gmac_aes_192; |
| 237 | break; |
| 238 | case 36: |
| 239 | sav->alg_auth = SADB_X_AALG_AES256GMAC; |
| 240 | sav->tdb_authalgxform = &auth_hash_gmac_aes_256; |
| 241 | break; |
| 242 | } |
| 243 | memset(&cria, 0, sizeof(cria)); |
| 244 | cria.cri_alg = sav->tdb_authalgxform->type; |
| 245 | cria.cri_klen = _KEYBITS(sav->key_enc); |
| 246 | cria.cri_key = _KEYBUF(sav->key_enc); |
| 247 | } |
| 248 | |
| 249 | /* Initialize crypto session. */ |
| 250 | memset(&crie, 0, sizeof (crie)); |
| 251 | crie.cri_alg = sav->tdb_encalgxform->type; |
| 252 | crie.cri_klen = _KEYBITS(sav->key_enc); |
| 253 | crie.cri_key = _KEYBUF(sav->key_enc); |
| 254 | /* XXX Rounds ? */ |
| 255 | |
| 256 | if (sav->tdb_authalgxform && sav->tdb_encalgxform) { |
| 257 | /* init both auth & enc */ |
| 258 | crie.cri_next = &cria; |
| 259 | error = crypto_newsession(&sav->tdb_cryptoid, |
| 260 | &crie, crypto_support); |
| 261 | } else if (sav->tdb_encalgxform) { |
| 262 | error = crypto_newsession(&sav->tdb_cryptoid, |
| 263 | &crie, crypto_support); |
| 264 | } else if (sav->tdb_authalgxform) { |
| 265 | error = crypto_newsession(&sav->tdb_cryptoid, |
| 266 | &cria, crypto_support); |
| 267 | } else { |
| 268 | /* XXX cannot happen? */ |
| 269 | DPRINTF(("esp_init: no encoding OR authentication xform!\n" )); |
| 270 | error = EINVAL; |
| 271 | } |
| 272 | return error; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Paranoia. |
| 277 | */ |
| 278 | static int |
| 279 | esp_zeroize(struct secasvar *sav) |
| 280 | { |
| 281 | /* NB: ah_zerorize free's the crypto session state */ |
| 282 | int error = ah_zeroize(sav); |
| 283 | |
| 284 | if (sav->key_enc) |
| 285 | memset(_KEYBUF(sav->key_enc), 0, _KEYLEN(sav->key_enc)); |
| 286 | sav->tdb_encalgxform = NULL; |
| 287 | sav->tdb_xform = NULL; |
| 288 | return error; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * ESP input processing, called (eventually) through the protocol switch. |
| 293 | */ |
| 294 | static int |
| 295 | esp_input(struct mbuf *m, const struct secasvar *sav, int skip, int protoff) |
| 296 | { |
| 297 | const struct auth_hash *esph; |
| 298 | const struct enc_xform *espx; |
| 299 | struct tdb_ident *tdbi; |
| 300 | struct tdb_crypto *tc; |
| 301 | int plen, alen, hlen, error; |
| 302 | struct m_tag *mtag; |
| 303 | struct newesp *esp; |
| 304 | |
| 305 | struct cryptodesc *crde; |
| 306 | struct cryptop *crp; |
| 307 | |
| 308 | IPSEC_SPLASSERT_SOFTNET("esp_input" ); |
| 309 | |
| 310 | IPSEC_ASSERT(sav != NULL, ("esp_input: null SA" )); |
| 311 | IPSEC_ASSERT(sav->tdb_encalgxform != NULL, |
| 312 | ("esp_input: null encoding xform" )); |
| 313 | IPSEC_ASSERT((skip&3) == 0 && (m->m_pkthdr.len&3) == 0, |
| 314 | ("esp_input: misaligned packet, skip %u pkt len %u" , |
| 315 | skip, m->m_pkthdr.len)); |
| 316 | |
| 317 | /* XXX don't pullup, just copy header */ |
| 318 | IP6_EXTHDR_GET(esp, struct newesp *, m, skip, sizeof (struct newesp)); |
| 319 | |
| 320 | esph = sav->tdb_authalgxform; |
| 321 | espx = sav->tdb_encalgxform; |
| 322 | |
| 323 | /* Determine the ESP header length */ |
| 324 | if (sav->flags & SADB_X_EXT_OLD) |
| 325 | hlen = sizeof (struct esp) + sav->ivlen; |
| 326 | else |
| 327 | hlen = sizeof (struct newesp) + sav->ivlen; |
| 328 | /* Authenticator hash size */ |
| 329 | alen = esph ? esph->authsize : 0; |
| 330 | |
| 331 | /* |
| 332 | * Verify payload length is multiple of encryption algorithm |
| 333 | * block size. |
| 334 | * |
| 335 | * NB: This works for the null algorithm because the blocksize |
| 336 | * is 4 and all packets must be 4-byte aligned regardless |
| 337 | * of the algorithm. |
| 338 | */ |
| 339 | plen = m->m_pkthdr.len - (skip + hlen + alen); |
| 340 | if ((plen & (espx->blocksize - 1)) || (plen <= 0)) { |
| 341 | DPRINTF(("esp_input: " |
| 342 | "payload of %d octets not a multiple of %d octets," |
| 343 | " SA %s/%08lx\n" , |
| 344 | plen, espx->blocksize, |
| 345 | ipsec_address(&sav->sah->saidx.dst), |
| 346 | (u_long) ntohl(sav->spi))); |
| 347 | ESP_STATINC(ESP_STAT_BADILEN); |
| 348 | m_freem(m); |
| 349 | return EINVAL; |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Check sequence number. |
| 354 | */ |
| 355 | if (esph && sav->replay && !ipsec_chkreplay(ntohl(esp->esp_seq), sav)) { |
| 356 | DPRINTF(("esp_input: packet replay check for %s\n" , |
| 357 | ipsec_logsastr(sav))); /*XXX*/ |
| 358 | ESP_STATINC(ESP_STAT_REPLAY); |
| 359 | m_freem(m); |
| 360 | return ENOBUFS; /*XXX*/ |
| 361 | } |
| 362 | |
| 363 | /* Update the counters */ |
| 364 | ESP_STATADD(ESP_STAT_IBYTES, m->m_pkthdr.len - skip - hlen - alen); |
| 365 | |
| 366 | /* Find out if we've already done crypto */ |
| 367 | for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL); |
| 368 | mtag != NULL; |
| 369 | mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) { |
| 370 | tdbi = (struct tdb_ident *) (mtag + 1); |
| 371 | if (tdbi->proto == sav->sah->saidx.proto && |
| 372 | tdbi->spi == sav->spi && |
| 373 | !memcmp(&tdbi->dst, &sav->sah->saidx.dst, |
| 374 | sizeof(union sockaddr_union))) |
| 375 | break; |
| 376 | } |
| 377 | |
| 378 | /* Get crypto descriptors */ |
| 379 | crp = crypto_getreq(esph && espx ? 2 : 1); |
| 380 | if (crp == NULL) { |
| 381 | DPRINTF(("esp_input: failed to acquire crypto descriptors\n" )); |
| 382 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 383 | m_freem(m); |
| 384 | return ENOBUFS; |
| 385 | } |
| 386 | |
| 387 | /* Get IPsec-specific opaque pointer */ |
| 388 | if (esph == NULL || mtag != NULL) |
| 389 | tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), |
| 390 | M_XDATA, M_NOWAIT|M_ZERO); |
| 391 | else |
| 392 | tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto) + alen, |
| 393 | M_XDATA, M_NOWAIT|M_ZERO); |
| 394 | if (tc == NULL) { |
| 395 | crypto_freereq(crp); |
| 396 | DPRINTF(("esp_input: failed to allocate tdb_crypto\n" )); |
| 397 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 398 | m_freem(m); |
| 399 | return ENOBUFS; |
| 400 | } |
| 401 | |
| 402 | error = m_makewritable(&m, 0, m->m_pkthdr.len, M_NOWAIT); |
| 403 | if (error) { |
| 404 | m_freem(m); |
| 405 | free(tc, M_XDATA); |
| 406 | crypto_freereq(crp); |
| 407 | DPRINTF(("esp_input: m_makewritable failed\n" )); |
| 408 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 409 | return error; |
| 410 | } |
| 411 | |
| 412 | tc->tc_ptr = mtag; |
| 413 | |
| 414 | if (esph) { |
| 415 | struct cryptodesc *crda = crp->crp_desc; |
| 416 | |
| 417 | IPSEC_ASSERT(crda != NULL, ("esp_input: null ah crypto descriptor" )); |
| 418 | |
| 419 | /* Authentication descriptor */ |
| 420 | crda->crd_skip = skip; |
| 421 | if (espx && espx->type == CRYPTO_AES_GCM_16) |
| 422 | crda->crd_len = hlen - sav->ivlen; |
| 423 | else |
| 424 | crda->crd_len = m->m_pkthdr.len - (skip + alen); |
| 425 | crda->crd_inject = m->m_pkthdr.len - alen; |
| 426 | |
| 427 | crda->crd_alg = esph->type; |
| 428 | if (espx && (espx->type == CRYPTO_AES_GCM_16 || |
| 429 | espx->type == CRYPTO_AES_GMAC)) { |
| 430 | crda->crd_key = _KEYBUF(sav->key_enc); |
| 431 | crda->crd_klen = _KEYBITS(sav->key_enc); |
| 432 | } else { |
| 433 | crda->crd_key = _KEYBUF(sav->key_auth); |
| 434 | crda->crd_klen = _KEYBITS(sav->key_auth); |
| 435 | } |
| 436 | |
| 437 | /* Copy the authenticator */ |
| 438 | if (mtag == NULL) |
| 439 | m_copydata(m, m->m_pkthdr.len - alen, alen, |
| 440 | (tc + 1)); |
| 441 | |
| 442 | /* Chain authentication request */ |
| 443 | crde = crda->crd_next; |
| 444 | } else { |
| 445 | crde = crp->crp_desc; |
| 446 | } |
| 447 | |
| 448 | /* Crypto operation descriptor */ |
| 449 | crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ |
| 450 | crp->crp_flags = CRYPTO_F_IMBUF; |
| 451 | crp->crp_buf = m; |
| 452 | crp->crp_callback = esp_input_cb; |
| 453 | crp->crp_sid = sav->tdb_cryptoid; |
| 454 | crp->crp_opaque = tc; |
| 455 | |
| 456 | /* These are passed as-is to the callback */ |
| 457 | tc->tc_spi = sav->spi; |
| 458 | tc->tc_dst = sav->sah->saidx.dst; |
| 459 | tc->tc_proto = sav->sah->saidx.proto; |
| 460 | tc->tc_protoff = protoff; |
| 461 | tc->tc_skip = skip; |
| 462 | |
| 463 | /* Decryption descriptor */ |
| 464 | if (espx) { |
| 465 | IPSEC_ASSERT(crde != NULL, ("esp_input: null esp crypto descriptor" )); |
| 466 | crde->crd_skip = skip + hlen; |
| 467 | if (espx->type == CRYPTO_AES_GMAC) |
| 468 | crde->crd_len = 0; |
| 469 | else |
| 470 | crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); |
| 471 | crde->crd_inject = skip + hlen - sav->ivlen; |
| 472 | |
| 473 | crde->crd_alg = espx->type; |
| 474 | crde->crd_key = _KEYBUF(sav->key_enc); |
| 475 | crde->crd_klen = _KEYBITS(sav->key_enc); |
| 476 | /* XXX Rounds ? */ |
| 477 | } |
| 478 | |
| 479 | if (mtag == NULL) |
| 480 | return crypto_dispatch(crp); |
| 481 | else |
| 482 | return esp_input_cb(crp); |
| 483 | } |
| 484 | |
| 485 | #ifdef INET6 |
| 486 | #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ |
| 487 | if (saidx->dst.sa.sa_family == AF_INET6) { \ |
| 488 | error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ |
| 489 | } else { \ |
| 490 | error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ |
| 491 | } \ |
| 492 | } while (0) |
| 493 | #else |
| 494 | #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ |
| 495 | (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) |
| 496 | #endif |
| 497 | |
| 498 | /* |
| 499 | * ESP input callback from the crypto driver. |
| 500 | */ |
| 501 | static int |
| 502 | esp_input_cb(struct cryptop *crp) |
| 503 | { |
| 504 | u_int8_t lastthree[3], aalg[AH_ALEN_MAX]; |
| 505 | int s, hlen, skip, protoff, error; |
| 506 | struct mbuf *m; |
| 507 | struct cryptodesc *crd __diagused; |
| 508 | const struct auth_hash *esph; |
| 509 | struct tdb_crypto *tc; |
| 510 | struct m_tag *mtag; |
| 511 | struct secasvar *sav; |
| 512 | struct secasindex *saidx; |
| 513 | void *ptr; |
| 514 | u_int16_t dport; |
| 515 | u_int16_t sport; |
| 516 | |
| 517 | crd = crp->crp_desc; |
| 518 | IPSEC_ASSERT(crd != NULL, ("esp_input_cb: null crypto descriptor!" )); |
| 519 | |
| 520 | tc = (struct tdb_crypto *) crp->crp_opaque; |
| 521 | IPSEC_ASSERT(tc != NULL, ("esp_input_cb: null opaque crypto data area!" )); |
| 522 | skip = tc->tc_skip; |
| 523 | protoff = tc->tc_protoff; |
| 524 | mtag = (struct m_tag *) tc->tc_ptr; |
| 525 | m = (struct mbuf *) crp->crp_buf; |
| 526 | |
| 527 | /* find the source port for NAT-T */ |
| 528 | nat_t_ports_get(m, &dport, &sport); |
| 529 | |
| 530 | s = splsoftnet(); |
| 531 | mutex_enter(softnet_lock); |
| 532 | |
| 533 | sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport); |
| 534 | if (sav == NULL) { |
| 535 | ESP_STATINC(ESP_STAT_NOTDB); |
| 536 | DPRINTF(("esp_input_cb: SA expired while in crypto " |
| 537 | "(SA %s/%08lx proto %u)\n" , ipsec_address(&tc->tc_dst), |
| 538 | (u_long) ntohl(tc->tc_spi), tc->tc_proto)); |
| 539 | error = ENOBUFS; /*XXX*/ |
| 540 | goto bad; |
| 541 | } |
| 542 | |
| 543 | saidx = &sav->sah->saidx; |
| 544 | IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || |
| 545 | saidx->dst.sa.sa_family == AF_INET6, |
| 546 | ("esp_input_cb: unexpected protocol family %u" , |
| 547 | saidx->dst.sa.sa_family)); |
| 548 | |
| 549 | esph = sav->tdb_authalgxform; |
| 550 | |
| 551 | /* Check for crypto errors */ |
| 552 | if (crp->crp_etype) { |
| 553 | /* Reset the session ID */ |
| 554 | if (sav->tdb_cryptoid != 0) |
| 555 | sav->tdb_cryptoid = crp->crp_sid; |
| 556 | |
| 557 | if (crp->crp_etype == EAGAIN) { |
| 558 | KEY_FREESAV(&sav); |
| 559 | mutex_exit(softnet_lock); |
| 560 | splx(s); |
| 561 | return crypto_dispatch(crp); |
| 562 | } |
| 563 | |
| 564 | ESP_STATINC(ESP_STAT_NOXFORM); |
| 565 | DPRINTF(("esp_input_cb: crypto error %d\n" , crp->crp_etype)); |
| 566 | error = crp->crp_etype; |
| 567 | goto bad; |
| 568 | } |
| 569 | |
| 570 | /* Shouldn't happen... */ |
| 571 | if (m == NULL) { |
| 572 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 573 | DPRINTF(("esp_input_cb: bogus returned buffer from crypto\n" )); |
| 574 | error = EINVAL; |
| 575 | goto bad; |
| 576 | } |
| 577 | ESP_STATINC(ESP_STAT_HIST + sav->alg_enc); |
| 578 | |
| 579 | /* If authentication was performed, check now. */ |
| 580 | if (esph != NULL) { |
| 581 | /* |
| 582 | * If we have a tag, it means an IPsec-aware NIC did |
| 583 | * the verification for us. Otherwise we need to |
| 584 | * check the authentication calculation. |
| 585 | */ |
| 586 | AH_STATINC(AH_STAT_HIST + sav->alg_auth); |
| 587 | if (mtag == NULL) { |
| 588 | /* Copy the authenticator from the packet */ |
| 589 | m_copydata(m, m->m_pkthdr.len - esph->authsize, |
| 590 | esph->authsize, aalg); |
| 591 | |
| 592 | ptr = (tc + 1); |
| 593 | |
| 594 | /* Verify authenticator */ |
| 595 | if (!consttime_memequal(ptr, aalg, esph->authsize)) { |
| 596 | DPRINTF(("esp_input_cb: " |
| 597 | "authentication hash mismatch for packet in SA %s/%08lx\n" , |
| 598 | ipsec_address(&saidx->dst), |
| 599 | (u_long) ntohl(sav->spi))); |
| 600 | ESP_STATINC(ESP_STAT_BADAUTH); |
| 601 | error = EACCES; |
| 602 | goto bad; |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | /* Remove trailing authenticator */ |
| 607 | m_adj(m, -(esph->authsize)); |
| 608 | } |
| 609 | |
| 610 | /* Release the crypto descriptors */ |
| 611 | free(tc, M_XDATA), tc = NULL; |
| 612 | crypto_freereq(crp), crp = NULL; |
| 613 | |
| 614 | /* |
| 615 | * Packet is now decrypted. |
| 616 | */ |
| 617 | m->m_flags |= M_DECRYPTED; |
| 618 | |
| 619 | /* |
| 620 | * Update replay sequence number, if appropriate. |
| 621 | */ |
| 622 | if (sav->replay) { |
| 623 | u_int32_t seq; |
| 624 | |
| 625 | m_copydata(m, skip + offsetof(struct newesp, esp_seq), |
| 626 | sizeof (seq), &seq); |
| 627 | if (ipsec_updatereplay(ntohl(seq), sav)) { |
| 628 | DPRINTF(("%s: packet replay check for %s\n" , __func__, |
| 629 | ipsec_logsastr(sav))); |
| 630 | ESP_STATINC(ESP_STAT_REPLAY); |
| 631 | error = ENOBUFS; |
| 632 | goto bad; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | /* Determine the ESP header length */ |
| 637 | if (sav->flags & SADB_X_EXT_OLD) |
| 638 | hlen = sizeof (struct esp) + sav->ivlen; |
| 639 | else |
| 640 | hlen = sizeof (struct newesp) + sav->ivlen; |
| 641 | |
| 642 | /* Remove the ESP header and IV from the mbuf. */ |
| 643 | error = m_striphdr(m, skip, hlen); |
| 644 | if (error) { |
| 645 | ESP_STATINC(ESP_STAT_HDROPS); |
| 646 | DPRINTF(("esp_input_cb: bad mbuf chain, SA %s/%08lx\n" , |
| 647 | ipsec_address(&sav->sah->saidx.dst), |
| 648 | (u_long) ntohl(sav->spi))); |
| 649 | goto bad; |
| 650 | } |
| 651 | |
| 652 | /* Save the last three bytes of decrypted data */ |
| 653 | m_copydata(m, m->m_pkthdr.len - 3, 3, lastthree); |
| 654 | |
| 655 | /* Verify pad length */ |
| 656 | if (lastthree[1] + 2 > m->m_pkthdr.len - skip) { |
| 657 | ESP_STATINC(ESP_STAT_BADILEN); |
| 658 | DPRINTF(("esp_input_cb: invalid padding length %d " |
| 659 | "for %u byte packet in SA %s/%08lx\n" , |
| 660 | lastthree[1], m->m_pkthdr.len - skip, |
| 661 | ipsec_address(&sav->sah->saidx.dst), |
| 662 | (u_long) ntohl(sav->spi))); |
| 663 | error = EINVAL; |
| 664 | goto bad; |
| 665 | } |
| 666 | |
| 667 | /* Verify correct decryption by checking the last padding bytes */ |
| 668 | if ((sav->flags & SADB_X_EXT_PMASK) != SADB_X_EXT_PRAND) { |
| 669 | if (lastthree[1] != lastthree[0] && lastthree[1] != 0) { |
| 670 | ESP_STATINC(ESP_STAT_BADENC); |
| 671 | DPRINTF(("esp_input_cb: decryption failed " |
| 672 | "for packet in SA %s/%08lx\n" , |
| 673 | ipsec_address(&sav->sah->saidx.dst), |
| 674 | (u_long) ntohl(sav->spi))); |
| 675 | DPRINTF(("esp_input_cb: %x %x\n" , lastthree[0], lastthree[1])); |
| 676 | error = EINVAL; |
| 677 | goto bad; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /* Trim the mbuf chain to remove trailing authenticator and padding */ |
| 682 | m_adj(m, -(lastthree[1] + 2)); |
| 683 | |
| 684 | /* Restore the Next Protocol field */ |
| 685 | m_copyback(m, protoff, sizeof (u_int8_t), lastthree + 2); |
| 686 | |
| 687 | IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag); |
| 688 | |
| 689 | KEY_FREESAV(&sav); |
| 690 | mutex_exit(softnet_lock); |
| 691 | splx(s); |
| 692 | return error; |
| 693 | bad: |
| 694 | if (sav) |
| 695 | KEY_FREESAV(&sav); |
| 696 | mutex_exit(softnet_lock); |
| 697 | splx(s); |
| 698 | if (m != NULL) |
| 699 | m_freem(m); |
| 700 | if (tc != NULL) |
| 701 | free(tc, M_XDATA); |
| 702 | if (crp != NULL) |
| 703 | crypto_freereq(crp); |
| 704 | return error; |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * ESP output routine, called by ipsec[46]_process_packet(). |
| 709 | */ |
| 710 | static int |
| 711 | esp_output( |
| 712 | struct mbuf *m, |
| 713 | struct ipsecrequest *isr, |
| 714 | struct mbuf **mp, |
| 715 | int skip, |
| 716 | int protoff |
| 717 | ) |
| 718 | { |
| 719 | const struct enc_xform *espx; |
| 720 | const struct auth_hash *esph; |
| 721 | int hlen, rlen, padding, blks, alen, i, roff; |
| 722 | struct mbuf *mo = NULL; |
| 723 | struct tdb_crypto *tc; |
| 724 | const struct secasvar *sav; |
| 725 | struct secasindex *saidx; |
| 726 | unsigned char *pad; |
| 727 | u_int8_t prot; |
| 728 | int error, maxpacketsize; |
| 729 | |
| 730 | struct cryptodesc *crde = NULL, *crda = NULL; |
| 731 | struct cryptop *crp; |
| 732 | |
| 733 | IPSEC_SPLASSERT_SOFTNET("esp_output" ); |
| 734 | |
| 735 | sav = isr->sav; |
| 736 | IPSEC_ASSERT(sav != NULL, ("esp_output: null SA" )); |
| 737 | esph = sav->tdb_authalgxform; |
| 738 | espx = sav->tdb_encalgxform; |
| 739 | IPSEC_ASSERT(espx != NULL, ("esp_output: null encoding xform" )); |
| 740 | |
| 741 | if (sav->flags & SADB_X_EXT_OLD) |
| 742 | hlen = sizeof (struct esp) + sav->ivlen; |
| 743 | else |
| 744 | hlen = sizeof (struct newesp) + sav->ivlen; |
| 745 | |
| 746 | rlen = m->m_pkthdr.len - skip; /* Raw payload length. */ |
| 747 | /* |
| 748 | * NB: The null encoding transform has a blocksize of 4 |
| 749 | * so that headers are properly aligned. |
| 750 | */ |
| 751 | blks = espx->blocksize; /* IV blocksize */ |
| 752 | |
| 753 | /* XXX clamp padding length a la KAME??? */ |
| 754 | padding = ((blks - ((rlen + 2) % blks)) % blks) + 2; |
| 755 | |
| 756 | if (esph) |
| 757 | alen = esph->authsize; |
| 758 | else |
| 759 | alen = 0; |
| 760 | |
| 761 | ESP_STATINC(ESP_STAT_OUTPUT); |
| 762 | |
| 763 | saidx = &sav->sah->saidx; |
| 764 | /* Check for maximum packet size violations. */ |
| 765 | switch (saidx->dst.sa.sa_family) { |
| 766 | #ifdef INET |
| 767 | case AF_INET: |
| 768 | maxpacketsize = IP_MAXPACKET; |
| 769 | break; |
| 770 | #endif /* INET */ |
| 771 | #ifdef INET6 |
| 772 | case AF_INET6: |
| 773 | maxpacketsize = IPV6_MAXPACKET; |
| 774 | break; |
| 775 | #endif /* INET6 */ |
| 776 | default: |
| 777 | DPRINTF(("esp_output: unknown/unsupported protocol " |
| 778 | "family %d, SA %s/%08lx\n" , |
| 779 | saidx->dst.sa.sa_family, ipsec_address(&saidx->dst), |
| 780 | (u_long) ntohl(sav->spi))); |
| 781 | ESP_STATINC(ESP_STAT_NOPF); |
| 782 | error = EPFNOSUPPORT; |
| 783 | goto bad; |
| 784 | } |
| 785 | if (skip + hlen + rlen + padding + alen > maxpacketsize) { |
| 786 | DPRINTF(("esp_output: packet in SA %s/%08lx got too big " |
| 787 | "(len %u, max len %u)\n" , |
| 788 | ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi), |
| 789 | skip + hlen + rlen + padding + alen, maxpacketsize)); |
| 790 | ESP_STATINC(ESP_STAT_TOOBIG); |
| 791 | error = EMSGSIZE; |
| 792 | goto bad; |
| 793 | } |
| 794 | |
| 795 | /* Update the counters. */ |
| 796 | ESP_STATADD(ESP_STAT_OBYTES, m->m_pkthdr.len - skip); |
| 797 | |
| 798 | m = m_clone(m); |
| 799 | if (m == NULL) { |
| 800 | DPRINTF(("esp_output: cannot clone mbuf chain, SA %s/%08lx\n" , |
| 801 | ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi))); |
| 802 | ESP_STATINC(ESP_STAT_HDROPS); |
| 803 | error = ENOBUFS; |
| 804 | goto bad; |
| 805 | } |
| 806 | |
| 807 | /* Inject ESP header. */ |
| 808 | mo = m_makespace(m, skip, hlen, &roff); |
| 809 | if (mo == NULL) { |
| 810 | DPRINTF(("esp_output: failed to inject %u byte ESP hdr for SA " |
| 811 | "%s/%08lx\n" , |
| 812 | hlen, ipsec_address(&saidx->dst), |
| 813 | (u_long) ntohl(sav->spi))); |
| 814 | ESP_STATINC(ESP_STAT_HDROPS); /* XXX diffs from openbsd */ |
| 815 | error = ENOBUFS; |
| 816 | goto bad; |
| 817 | } |
| 818 | |
| 819 | /* Initialize ESP header. */ |
| 820 | memcpy(mtod(mo, char *) + roff, &sav->spi, sizeof(u_int32_t)); |
| 821 | if (sav->replay) { |
| 822 | u_int32_t replay; |
| 823 | |
| 824 | #ifdef IPSEC_DEBUG |
| 825 | /* Emulate replay attack when ipsec_replay is TRUE. */ |
| 826 | if (!ipsec_replay) |
| 827 | #endif |
| 828 | sav->replay->count++; |
| 829 | |
| 830 | replay = htonl(sav->replay->count); |
| 831 | bcopy(&replay, |
| 832 | mtod(mo,char *) + roff + sizeof(u_int32_t), |
| 833 | sizeof(u_int32_t)); |
| 834 | } |
| 835 | |
| 836 | /* |
| 837 | * Add padding -- better to do it ourselves than use the crypto engine, |
| 838 | * although if/when we support compression, we'd have to do that. |
| 839 | */ |
| 840 | pad = (u_char *) m_pad(m, padding + alen); |
| 841 | if (pad == NULL) { |
| 842 | DPRINTF(("esp_output: m_pad failed for SA %s/%08lx\n" , |
| 843 | ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi))); |
| 844 | m = NULL; /* NB: free'd by m_pad */ |
| 845 | error = ENOBUFS; |
| 846 | goto bad; |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Add padding: random, zero, or self-describing. |
| 851 | * XXX catch unexpected setting |
| 852 | */ |
| 853 | switch (sav->flags & SADB_X_EXT_PMASK) { |
| 854 | case SADB_X_EXT_PRAND: |
| 855 | (void) read_random(pad, padding - 2); |
| 856 | break; |
| 857 | case SADB_X_EXT_PZERO: |
| 858 | memset(pad, 0, padding - 2); |
| 859 | break; |
| 860 | case SADB_X_EXT_PSEQ: |
| 861 | for (i = 0; i < padding - 2; i++) |
| 862 | pad[i] = i+1; |
| 863 | break; |
| 864 | } |
| 865 | |
| 866 | /* Fix padding length and Next Protocol in padding itself. */ |
| 867 | pad[padding - 2] = padding - 2; |
| 868 | m_copydata(m, protoff, sizeof(u_int8_t), pad + padding - 1); |
| 869 | |
| 870 | /* Fix Next Protocol in IPv4/IPv6 header. */ |
| 871 | prot = IPPROTO_ESP; |
| 872 | m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); |
| 873 | |
| 874 | /* Get crypto descriptors. */ |
| 875 | crp = crypto_getreq(esph && espx ? 2 : 1); |
| 876 | if (crp == NULL) { |
| 877 | DPRINTF(("esp_output: failed to acquire crypto descriptors\n" )); |
| 878 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 879 | error = ENOBUFS; |
| 880 | goto bad; |
| 881 | } |
| 882 | |
| 883 | if (espx) { |
| 884 | crde = crp->crp_desc; |
| 885 | crda = crde->crd_next; |
| 886 | |
| 887 | /* Encryption descriptor. */ |
| 888 | crde->crd_skip = skip + hlen; |
| 889 | if (espx->type == CRYPTO_AES_GMAC) |
| 890 | crde->crd_len = 0; |
| 891 | else |
| 892 | crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); |
| 893 | crde->crd_flags = CRD_F_ENCRYPT; |
| 894 | crde->crd_inject = skip + hlen - sav->ivlen; |
| 895 | |
| 896 | /* Encryption operation. */ |
| 897 | crde->crd_alg = espx->type; |
| 898 | crde->crd_key = _KEYBUF(sav->key_enc); |
| 899 | crde->crd_klen = _KEYBITS(sav->key_enc); |
| 900 | /* XXX Rounds ? */ |
| 901 | } else |
| 902 | crda = crp->crp_desc; |
| 903 | |
| 904 | /* IPsec-specific opaque crypto info. */ |
| 905 | tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), |
| 906 | M_XDATA, M_NOWAIT|M_ZERO); |
| 907 | if (tc == NULL) { |
| 908 | crypto_freereq(crp); |
| 909 | DPRINTF(("esp_output: failed to allocate tdb_crypto\n" )); |
| 910 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 911 | error = ENOBUFS; |
| 912 | goto bad; |
| 913 | } |
| 914 | |
| 915 | /* Callback parameters */ |
| 916 | tc->tc_isr = isr; |
| 917 | tc->tc_spi = sav->spi; |
| 918 | tc->tc_dst = saidx->dst; |
| 919 | tc->tc_proto = saidx->proto; |
| 920 | |
| 921 | /* Crypto operation descriptor. */ |
| 922 | crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */ |
| 923 | crp->crp_flags = CRYPTO_F_IMBUF; |
| 924 | crp->crp_buf = m; |
| 925 | crp->crp_callback = esp_output_cb; |
| 926 | crp->crp_opaque = tc; |
| 927 | crp->crp_sid = sav->tdb_cryptoid; |
| 928 | |
| 929 | if (esph) { |
| 930 | /* Authentication descriptor. */ |
| 931 | crda->crd_skip = skip; |
| 932 | if (espx && espx->type == CRYPTO_AES_GCM_16) |
| 933 | crda->crd_len = hlen - sav->ivlen; |
| 934 | else |
| 935 | crda->crd_len = m->m_pkthdr.len - (skip + alen); |
| 936 | crda->crd_inject = m->m_pkthdr.len - alen; |
| 937 | |
| 938 | /* Authentication operation. */ |
| 939 | crda->crd_alg = esph->type; |
| 940 | if (espx && (espx->type == CRYPTO_AES_GCM_16 || |
| 941 | espx->type == CRYPTO_AES_GMAC)) { |
| 942 | crda->crd_key = _KEYBUF(sav->key_enc); |
| 943 | crda->crd_klen = _KEYBITS(sav->key_enc); |
| 944 | } else { |
| 945 | crda->crd_key = _KEYBUF(sav->key_auth); |
| 946 | crda->crd_klen = _KEYBITS(sav->key_auth); |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | return crypto_dispatch(crp); |
| 951 | bad: |
| 952 | if (m) |
| 953 | m_freem(m); |
| 954 | return (error); |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * ESP output callback from the crypto driver. |
| 959 | */ |
| 960 | static int |
| 961 | esp_output_cb(struct cryptop *crp) |
| 962 | { |
| 963 | struct tdb_crypto *tc; |
| 964 | struct ipsecrequest *isr; |
| 965 | struct secasvar *sav; |
| 966 | struct mbuf *m; |
| 967 | int s, err, error; |
| 968 | |
| 969 | tc = (struct tdb_crypto *) crp->crp_opaque; |
| 970 | IPSEC_ASSERT(tc != NULL, ("esp_output_cb: null opaque data area!" )); |
| 971 | m = (struct mbuf *) crp->crp_buf; |
| 972 | |
| 973 | s = splsoftnet(); |
| 974 | mutex_enter(softnet_lock); |
| 975 | |
| 976 | isr = tc->tc_isr; |
| 977 | sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0); |
| 978 | if (sav == NULL) { |
| 979 | ESP_STATINC(ESP_STAT_NOTDB); |
| 980 | DPRINTF(("esp_output_cb: SA expired while in crypto " |
| 981 | "(SA %s/%08lx proto %u)\n" , ipsec_address(&tc->tc_dst), |
| 982 | (u_long) ntohl(tc->tc_spi), tc->tc_proto)); |
| 983 | error = ENOBUFS; /*XXX*/ |
| 984 | goto bad; |
| 985 | } |
| 986 | IPSEC_ASSERT(isr->sav == sav, |
| 987 | ("esp_output_cb: SA changed was %p now %p\n" , isr->sav, sav)); |
| 988 | |
| 989 | /* Check for crypto errors. */ |
| 990 | if (crp->crp_etype) { |
| 991 | /* Reset session ID. */ |
| 992 | if (sav->tdb_cryptoid != 0) |
| 993 | sav->tdb_cryptoid = crp->crp_sid; |
| 994 | |
| 995 | if (crp->crp_etype == EAGAIN) { |
| 996 | KEY_FREESAV(&sav); |
| 997 | mutex_exit(softnet_lock); |
| 998 | splx(s); |
| 999 | return crypto_dispatch(crp); |
| 1000 | } |
| 1001 | |
| 1002 | ESP_STATINC(ESP_STAT_NOXFORM); |
| 1003 | DPRINTF(("esp_output_cb: crypto error %d\n" , crp->crp_etype)); |
| 1004 | error = crp->crp_etype; |
| 1005 | goto bad; |
| 1006 | } |
| 1007 | |
| 1008 | /* Shouldn't happen... */ |
| 1009 | if (m == NULL) { |
| 1010 | ESP_STATINC(ESP_STAT_CRYPTO); |
| 1011 | DPRINTF(("esp_output_cb: bogus returned buffer from crypto\n" )); |
| 1012 | error = EINVAL; |
| 1013 | goto bad; |
| 1014 | } |
| 1015 | ESP_STATINC(ESP_STAT_HIST + sav->alg_enc); |
| 1016 | if (sav->tdb_authalgxform != NULL) |
| 1017 | AH_STATINC(AH_STAT_HIST + sav->alg_auth); |
| 1018 | |
| 1019 | /* Release crypto descriptors. */ |
| 1020 | free(tc, M_XDATA); |
| 1021 | crypto_freereq(crp); |
| 1022 | |
| 1023 | #ifdef IPSEC_DEBUG |
| 1024 | /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */ |
| 1025 | if (ipsec_integrity) { |
| 1026 | static unsigned char ipseczeroes[AH_ALEN_MAX]; |
| 1027 | const struct auth_hash *esph; |
| 1028 | |
| 1029 | /* |
| 1030 | * Corrupt HMAC if we want to test integrity verification of |
| 1031 | * the other side. |
| 1032 | */ |
| 1033 | esph = sav->tdb_authalgxform; |
| 1034 | if (esph != NULL) { |
| 1035 | m_copyback(m, m->m_pkthdr.len - esph->authsize, |
| 1036 | esph->authsize, ipseczeroes); |
| 1037 | } |
| 1038 | } |
| 1039 | #endif |
| 1040 | |
| 1041 | /* NB: m is reclaimed by ipsec_process_done. */ |
| 1042 | err = ipsec_process_done(m, isr); |
| 1043 | KEY_FREESAV(&sav); |
| 1044 | mutex_exit(softnet_lock); |
| 1045 | splx(s); |
| 1046 | return err; |
| 1047 | bad: |
| 1048 | if (sav) |
| 1049 | KEY_FREESAV(&sav); |
| 1050 | mutex_exit(softnet_lock); |
| 1051 | splx(s); |
| 1052 | if (m) |
| 1053 | m_freem(m); |
| 1054 | free(tc, M_XDATA); |
| 1055 | crypto_freereq(crp); |
| 1056 | return error; |
| 1057 | } |
| 1058 | |
| 1059 | static struct xformsw esp_xformsw = { |
| 1060 | XF_ESP, XFT_CONF|XFT_AUTH, "IPsec ESP" , |
| 1061 | esp_init, esp_zeroize, esp_input, |
| 1062 | esp_output, |
| 1063 | NULL, |
| 1064 | }; |
| 1065 | |
| 1066 | INITFN void |
| 1067 | esp_attach(void) |
| 1068 | { |
| 1069 | |
| 1070 | espstat_percpu = percpu_alloc(sizeof(uint64_t) * ESP_NSTATS); |
| 1071 | |
| 1072 | #define MAXIV(xform) \ |
| 1073 | if (xform.ivsize > esp_max_ivlen) \ |
| 1074 | esp_max_ivlen = xform.ivsize \ |
| 1075 | |
| 1076 | esp_max_ivlen = 0; |
| 1077 | MAXIV(enc_xform_des); /* SADB_EALG_DESCBC */ |
| 1078 | MAXIV(enc_xform_3des); /* SADB_EALG_3DESCBC */ |
| 1079 | MAXIV(enc_xform_rijndael128); /* SADB_X_EALG_AES */ |
| 1080 | MAXIV(enc_xform_blf); /* SADB_X_EALG_BLOWFISHCBC */ |
| 1081 | MAXIV(enc_xform_cast5); /* SADB_X_EALG_CAST128CBC */ |
| 1082 | MAXIV(enc_xform_skipjack); /* SADB_X_EALG_SKIPJACK */ |
| 1083 | MAXIV(enc_xform_camellia); /* SADB_X_EALG_CAMELLIACBC */ |
| 1084 | MAXIV(enc_xform_aes_ctr); /* SADB_X_EALG_AESCTR */ |
| 1085 | MAXIV(enc_xform_null); /* SADB_EALG_NULL */ |
| 1086 | |
| 1087 | xform_register(&esp_xformsw); |
| 1088 | #undef MAXIV |
| 1089 | } |
| 1090 | #ifdef __FreeBSD__ |
| 1091 | SYSINIT(esp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, esp_attach, NULL) |
| 1092 | #else |
| 1093 | #endif |
| 1094 | |