| 1 | /* $NetBSD: ipsec.c,v 1.66 2015/04/01 02:49:44 ozaki-r Exp $ */ |
| 2 | /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */ |
| 3 | /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ |
| 4 | |
| 5 | /* |
| 6 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 7 | * All rights reserved. |
| 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 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the project nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.66 2015/04/01 02:49:44 ozaki-r Exp $" ); |
| 36 | |
| 37 | /* |
| 38 | * IPsec controller part. |
| 39 | */ |
| 40 | |
| 41 | #include "opt_inet.h" |
| 42 | #ifdef __FreeBSD__ |
| 43 | #include "opt_inet6.h" |
| 44 | #endif |
| 45 | #include "opt_ipsec.h" |
| 46 | |
| 47 | #include <sys/param.h> |
| 48 | #include <sys/systm.h> |
| 49 | #include <sys/malloc.h> |
| 50 | #include <sys/mbuf.h> |
| 51 | #include <sys/domain.h> |
| 52 | #include <sys/protosw.h> |
| 53 | #include <sys/socket.h> |
| 54 | #include <sys/socketvar.h> |
| 55 | #include <sys/errno.h> |
| 56 | #include <sys/time.h> |
| 57 | #include <sys/kernel.h> |
| 58 | #include <sys/syslog.h> |
| 59 | #include <sys/sysctl.h> |
| 60 | #include <sys/proc.h> |
| 61 | #include <sys/kauth.h> |
| 62 | |
| 63 | #include <net/if.h> |
| 64 | #include <net/route.h> |
| 65 | |
| 66 | #include <netinet/in.h> |
| 67 | #include <netinet/in_systm.h> |
| 68 | #include <netinet/ip.h> |
| 69 | #include <netinet/ip_var.h> |
| 70 | #include <netinet/in_var.h> |
| 71 | #include <netinet/udp.h> |
| 72 | #include <netinet/udp_var.h> |
| 73 | #include <netinet/tcp.h> |
| 74 | #include <netinet/udp.h> |
| 75 | #include <netinet/ip_icmp.h> |
| 76 | #include <netinet/ip_private.h> |
| 77 | |
| 78 | #include <netinet/ip6.h> |
| 79 | #ifdef INET6 |
| 80 | #include <netinet6/ip6_var.h> |
| 81 | #endif |
| 82 | #include <netinet/in_pcb.h> |
| 83 | #ifdef INET6 |
| 84 | #include <netinet6/in6_pcb.h> |
| 85 | #include <netinet/icmp6.h> |
| 86 | #endif |
| 87 | |
| 88 | #include <netipsec/ipsec.h> |
| 89 | #include <netipsec/ipsec_var.h> |
| 90 | #include <netipsec/ipsec_private.h> |
| 91 | #ifdef INET6 |
| 92 | #include <netipsec/ipsec6.h> |
| 93 | #endif |
| 94 | #include <netipsec/ah_var.h> |
| 95 | #include <netipsec/esp_var.h> |
| 96 | #include <netipsec/ipcomp.h> /*XXX*/ |
| 97 | #include <netipsec/ipcomp_var.h> |
| 98 | |
| 99 | #include <netipsec/key.h> |
| 100 | #include <netipsec/keydb.h> |
| 101 | #include <netipsec/key_debug.h> |
| 102 | |
| 103 | #include <netipsec/xform.h> |
| 104 | |
| 105 | #include <netipsec/ipsec_osdep.h> |
| 106 | |
| 107 | #include <net/net_osdep.h> |
| 108 | |
| 109 | int ipsec_used = 0; |
| 110 | int ipsec_enabled = 1; |
| 111 | |
| 112 | #ifdef IPSEC_DEBUG |
| 113 | int ipsec_debug = 1; |
| 114 | |
| 115 | /* |
| 116 | * When set to 1, IPsec will send packets with the same sequence number. |
| 117 | * This allows to verify if the other side has proper replay attacks detection. |
| 118 | */ |
| 119 | int ipsec_replay = 0; |
| 120 | |
| 121 | /* |
| 122 | * When set 1, IPsec will send packets with corrupted HMAC. |
| 123 | * This allows to verify if the other side properly detects modified packets. |
| 124 | */ |
| 125 | int ipsec_integrity = 0; |
| 126 | #else |
| 127 | int ipsec_debug = 0; |
| 128 | #endif |
| 129 | |
| 130 | percpu_t *ipsecstat_percpu; |
| 131 | int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ |
| 132 | int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ |
| 133 | int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; |
| 134 | int ip4_esp_net_deflev = IPSEC_LEVEL_USE; |
| 135 | int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; |
| 136 | int ip4_ah_net_deflev = IPSEC_LEVEL_USE; |
| 137 | struct secpolicy ip4_def_policy; |
| 138 | int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ |
| 139 | int ip4_esp_randpad = -1; |
| 140 | |
| 141 | #ifdef __NetBSD__ |
| 142 | u_int ipsec_spdgen = 1; /* SPD generation # */ |
| 143 | |
| 144 | static struct secpolicy *ipsec_checkpcbcache (struct mbuf *, |
| 145 | struct inpcbpolicy *, int); |
| 146 | static int ipsec_fillpcbcache (struct inpcbpolicy *, struct mbuf *, |
| 147 | struct secpolicy *, int); |
| 148 | static int ipsec_invalpcbcache (struct inpcbpolicy *, int); |
| 149 | #endif /* __NetBSD__ */ |
| 150 | |
| 151 | /* |
| 152 | * Crypto support requirements: |
| 153 | * |
| 154 | * 1 require hardware support |
| 155 | * -1 require software support |
| 156 | * 0 take anything |
| 157 | */ |
| 158 | int crypto_support = 0; |
| 159 | |
| 160 | static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, |
| 161 | PCB_T *, int *); |
| 162 | |
| 163 | #ifdef __FreeBSD__ |
| 164 | SYSCTL_DECL(_net_inet_ipsec); |
| 165 | |
| 166 | /* net.inet.ipsec */ |
| 167 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, |
| 168 | def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "" ); |
| 169 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, |
| 170 | CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "" ); |
| 171 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, |
| 172 | CTLFLAG_RW, &ip4_esp_net_deflev, 0, "" ); |
| 173 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, |
| 174 | CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "" ); |
| 175 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, |
| 176 | CTLFLAG_RW, &ip4_ah_net_deflev, 0, "" ); |
| 177 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, |
| 178 | ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, "" ); |
| 179 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, |
| 180 | ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "" ); |
| 181 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, |
| 182 | dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "" ); |
| 183 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, |
| 184 | ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "" ); |
| 185 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, |
| 186 | debug, CTLFLAG_RW, &ipsec_debug, 0, "" ); |
| 187 | SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, |
| 188 | esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "" ); |
| 189 | SYSCTL_INT(_net_inet_ipsec, OID_AUTO, |
| 190 | crypto_support, CTLFLAG_RW, &crypto_support,0, "" ); |
| 191 | SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, |
| 192 | ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "" ); |
| 193 | SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, |
| 194 | "Emulate replay attack" ); |
| 195 | SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, |
| 196 | &ipsec_integrity, 0, "Emulate man-in-the-middle attack" ); |
| 197 | #endif /* __FreeBSD__ */ |
| 198 | |
| 199 | #ifdef INET6 |
| 200 | int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; |
| 201 | int ip6_esp_net_deflev = IPSEC_LEVEL_USE; |
| 202 | int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; |
| 203 | int ip6_ah_net_deflev = IPSEC_LEVEL_USE; |
| 204 | struct secpolicy ip6_def_policy; |
| 205 | int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ |
| 206 | int ip6_esp_randpad = -1; |
| 207 | |
| 208 | |
| 209 | #ifdef __FreeBSD__ |
| 210 | SYSCTL_DECL(_net_inet6_ipsec6); |
| 211 | |
| 212 | /* net.inet6.ipsec6 */ |
| 213 | #ifdef COMPAT_KAME |
| 214 | SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, |
| 215 | 0,0, compat_ipsecstats_sysctl, "S" , "" ); |
| 216 | #endif /* COMPAT_KAME */ |
| 217 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, |
| 218 | def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "" ); |
| 219 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, |
| 220 | CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "" ); |
| 221 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, |
| 222 | CTLFLAG_RW, &ip6_esp_net_deflev, 0, "" ); |
| 223 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, |
| 224 | CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "" ); |
| 225 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, |
| 226 | CTLFLAG_RW, &ip6_ah_net_deflev, 0, "" ); |
| 227 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, |
| 228 | ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "" ); |
| 229 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, |
| 230 | debug, CTLFLAG_RW, &ipsec_debug, 0, "" ); |
| 231 | SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, |
| 232 | esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "" ); |
| 233 | #endif /* __FreeBSD__ */ |
| 234 | #endif /* INET6 */ |
| 235 | |
| 236 | static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *); |
| 237 | #ifdef INET6 |
| 238 | static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *); |
| 239 | #endif |
| 240 | static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int); |
| 241 | static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int); |
| 242 | static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); |
| 243 | #ifdef INET6 |
| 244 | static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int); |
| 245 | static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); |
| 246 | #endif |
| 247 | static void ipsec_delpcbpolicy (struct inpcbpolicy *); |
| 248 | static struct secpolicy *ipsec_deepcopy_policy (const struct secpolicy *); |
| 249 | static int ipsec_set_policy (struct secpolicy **, int, const void *, size_t, |
| 250 | kauth_cred_t); |
| 251 | static int ipsec_get_policy (struct secpolicy *, struct mbuf **); |
| 252 | static void vshiftl (unsigned char *, int, int); |
| 253 | static size_t ipsec_hdrsiz (const struct secpolicy *); |
| 254 | |
| 255 | #ifdef __NetBSD__ |
| 256 | /* |
| 257 | * Try to validate and use cached policy on a PCB. |
| 258 | */ |
| 259 | static struct secpolicy * |
| 260 | ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) |
| 261 | { |
| 262 | struct secpolicyindex spidx; |
| 263 | |
| 264 | switch (dir) { |
| 265 | case IPSEC_DIR_INBOUND: |
| 266 | case IPSEC_DIR_OUTBOUND: |
| 267 | case IPSEC_DIR_ANY: |
| 268 | break; |
| 269 | default: |
| 270 | return NULL; |
| 271 | } |
| 272 | #ifdef DIAGNOSTIC |
| 273 | if (pcbsp == NULL) { |
| 274 | printf("%s: NULL pcbsp\n" , __func__); |
| 275 | /* XXX panic? */ |
| 276 | return NULL; |
| 277 | } |
| 278 | #endif |
| 279 | |
| 280 | #ifdef DIAGNOSTIC |
| 281 | if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) |
| 282 | panic("dir too big in ipsec_checkpcbcache" ); |
| 283 | #endif |
| 284 | /* SPD table change invalidate all the caches. */ |
| 285 | if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { |
| 286 | ipsec_invalpcbcache(pcbsp, dir); |
| 287 | return NULL; |
| 288 | } |
| 289 | if (!pcbsp->sp_cache[dir].cachesp) |
| 290 | return NULL; |
| 291 | if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) { |
| 292 | ipsec_invalpcbcache(pcbsp, dir); |
| 293 | return NULL; |
| 294 | } |
| 295 | if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { |
| 296 | if (!pcbsp->sp_cache[dir].cachesp) |
| 297 | return NULL; |
| 298 | if (ipsec_setspidx(m, &spidx, 1) != 0) |
| 299 | return NULL; |
| 300 | |
| 301 | /* |
| 302 | * We have to make an exact match here since the cached rule |
| 303 | * might have lower priority than a rule that would otherwise |
| 304 | * have matched the packet. |
| 305 | */ |
| 306 | |
| 307 | if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx))) |
| 308 | return NULL; |
| 309 | |
| 310 | } else { |
| 311 | /* |
| 312 | * The pcb is connected, and the L4 code is sure that: |
| 313 | * - outgoing side uses inp_[lf]addr |
| 314 | * - incoming side looks up policy after inpcb lookup |
| 315 | * and address pair is know to be stable. We do not need |
| 316 | * to generate spidx again, nor check the address match again. |
| 317 | * |
| 318 | * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds |
| 319 | * and there are calls to ipsec_pcbconn() from in_pcbconnect(). |
| 320 | */ |
| 321 | } |
| 322 | |
| 323 | pcbsp->sp_cache[dir].cachesp->lastused = time_second; |
| 324 | pcbsp->sp_cache[dir].cachesp->refcnt++; |
| 325 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, |
| 326 | printf("DP %s cause refcnt++:%d SP:%p\n" , __func__, |
| 327 | pcbsp->sp_cache[dir].cachesp->refcnt, |
| 328 | pcbsp->sp_cache[dir].cachesp)); |
| 329 | return pcbsp->sp_cache[dir].cachesp; |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, |
| 334 | struct secpolicy *sp, int dir) |
| 335 | { |
| 336 | |
| 337 | switch (dir) { |
| 338 | case IPSEC_DIR_INBOUND: |
| 339 | case IPSEC_DIR_OUTBOUND: |
| 340 | break; |
| 341 | default: |
| 342 | return EINVAL; |
| 343 | } |
| 344 | #ifdef DIAGNOSTIC |
| 345 | if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) |
| 346 | panic("dir too big in ipsec_fillpcbcache" ); |
| 347 | #endif |
| 348 | |
| 349 | if (pcbsp->sp_cache[dir].cachesp) |
| 350 | KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); |
| 351 | pcbsp->sp_cache[dir].cachesp = NULL; |
| 352 | pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; |
| 353 | if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { |
| 354 | return EINVAL; |
| 355 | } |
| 356 | pcbsp->sp_cache[dir].cachesp = sp; |
| 357 | if (pcbsp->sp_cache[dir].cachesp) { |
| 358 | pcbsp->sp_cache[dir].cachesp->refcnt++; |
| 359 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, |
| 360 | printf("DP %s cause refcnt++:%d SP:%p\n" , __func__, |
| 361 | pcbsp->sp_cache[dir].cachesp->refcnt, |
| 362 | pcbsp->sp_cache[dir].cachesp)); |
| 363 | |
| 364 | /* |
| 365 | * If the PCB is connected, we can remember a hint to |
| 366 | * possibly short-circuit IPsec processing in other places. |
| 367 | */ |
| 368 | if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { |
| 369 | switch (pcbsp->sp_cache[dir].cachesp->policy) { |
| 370 | case IPSEC_POLICY_NONE: |
| 371 | case IPSEC_POLICY_BYPASS: |
| 372 | pcbsp->sp_cache[dir].cachehint = |
| 373 | IPSEC_PCBHINT_NO; |
| 374 | break; |
| 375 | default: |
| 376 | pcbsp->sp_cache[dir].cachehint = |
| 377 | IPSEC_PCBHINT_YES; |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static int |
| 387 | ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) |
| 388 | { |
| 389 | int i; |
| 390 | |
| 391 | for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { |
| 392 | if (dir != IPSEC_DIR_ANY && i != dir) |
| 393 | continue; |
| 394 | if (pcbsp->sp_cache[i].cachesp) |
| 395 | KEY_FREESP(&pcbsp->sp_cache[i].cachesp); |
| 396 | pcbsp->sp_cache[i].cachesp = NULL; |
| 397 | pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; |
| 398 | pcbsp->sp_cache[i].cachegen = 0; |
| 399 | memset(&pcbsp->sp_cache[i].cacheidx, 0, |
| 400 | sizeof(pcbsp->sp_cache[i].cacheidx)); |
| 401 | } |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | void |
| 406 | ipsec_pcbconn(struct inpcbpolicy *pcbsp) |
| 407 | { |
| 408 | |
| 409 | pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; |
| 410 | ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); |
| 411 | } |
| 412 | |
| 413 | void |
| 414 | ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) |
| 415 | { |
| 416 | |
| 417 | pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; |
| 418 | ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); |
| 419 | } |
| 420 | |
| 421 | void |
| 422 | ipsec_invalpcbcacheall(void) |
| 423 | { |
| 424 | |
| 425 | if (ipsec_spdgen == UINT_MAX) |
| 426 | ipsec_spdgen = 1; |
| 427 | else |
| 428 | ipsec_spdgen++; |
| 429 | } |
| 430 | #endif /* __NetBSD__ */ |
| 431 | |
| 432 | /* |
| 433 | * Return a held reference to the default SP. |
| 434 | */ |
| 435 | static struct secpolicy * |
| 436 | key_allocsp_default(int af, const char *where, int tag) |
| 437 | { |
| 438 | struct secpolicy *sp; |
| 439 | |
| 440 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, |
| 441 | printf("DP %s from %s:%u\n" , __func__, where, tag)); |
| 442 | |
| 443 | switch(af) { |
| 444 | case AF_INET: |
| 445 | sp = &ip4_def_policy; |
| 446 | break; |
| 447 | #ifdef INET6 |
| 448 | case AF_INET6: |
| 449 | sp = &ip6_def_policy; |
| 450 | break; |
| 451 | #endif |
| 452 | default: |
| 453 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, |
| 454 | printf("%s: unexpected protocol family %u\n" , __func__, |
| 455 | af)); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | if (sp->policy != IPSEC_POLICY_DISCARD && |
| 460 | sp->policy != IPSEC_POLICY_NONE) { |
| 461 | ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n" , |
| 462 | sp->policy, IPSEC_POLICY_NONE)); |
| 463 | sp->policy = IPSEC_POLICY_NONE; |
| 464 | } |
| 465 | sp->refcnt++; |
| 466 | |
| 467 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP %s returns SP:%p (%u)\n" , |
| 468 | __func__, sp, sp->refcnt)); |
| 469 | return sp; |
| 470 | } |
| 471 | #define KEY_ALLOCSP_DEFAULT(af) \ |
| 472 | key_allocsp_default((af),__FILE__, __LINE__) |
| 473 | |
| 474 | /* |
| 475 | * For OUTBOUND packet having a socket. Searching SPD for packet, |
| 476 | * and return a pointer to SP. |
| 477 | * OUT: NULL: no apropreate SP found, the following value is set to error. |
| 478 | * 0 : bypass |
| 479 | * EACCES : discard packet. |
| 480 | * ENOENT : ipsec_acquire() in progress, maybe. |
| 481 | * others : error occurred. |
| 482 | * others: a pointer to SP |
| 483 | * |
| 484 | * NOTE: IPv6 mapped address concern is implemented here. |
| 485 | */ |
| 486 | struct secpolicy * |
| 487 | ipsec_getpolicy(const struct tdb_ident *tdbi, u_int dir) |
| 488 | { |
| 489 | struct secpolicy *sp; |
| 490 | |
| 491 | IPSEC_ASSERT(tdbi != NULL, ("%s: null tdbi" , __func__)); |
| 492 | IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, |
| 493 | ("%s: invalid direction %u" , __func__, dir)); |
| 494 | |
| 495 | sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); |
| 496 | if (sp == NULL) /*XXX????*/ |
| 497 | sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family); |
| 498 | IPSEC_ASSERT(sp != NULL, ("%s: null SP" , __func__)); |
| 499 | return sp; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * For OUTBOUND packet having a socket. Searching SPD for packet, |
| 504 | * and return a pointer to SP. |
| 505 | * OUT: NULL: no apropreate SP found, the following value is set to error. |
| 506 | * 0 : bypass |
| 507 | * EACCES : discard packet. |
| 508 | * ENOENT : ipsec_acquire() in progress, maybe. |
| 509 | * others : error occurred. |
| 510 | * others: a pointer to SP |
| 511 | * |
| 512 | * NOTE: IPv6 mapped address concern is implemented here. |
| 513 | */ |
| 514 | static struct secpolicy * |
| 515 | ipsec_getpolicybysock(struct mbuf *m, u_int dir, PCB_T *inp, int *error) |
| 516 | { |
| 517 | struct inpcbpolicy *pcbsp = NULL; |
| 518 | struct secpolicy *currsp = NULL; /* policy on socket */ |
| 519 | struct secpolicy *sp; |
| 520 | int af; |
| 521 | |
| 522 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 523 | IPSEC_ASSERT(inp != NULL, ("%s: null inpcb" , __func__)); |
| 524 | IPSEC_ASSERT(error != NULL, ("%s: null error" , __func__)); |
| 525 | IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, |
| 526 | ("%s: invalid direction %u" , __func__, dir)); |
| 527 | |
| 528 | IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, ("%s: null socket" , __func__)); |
| 529 | |
| 530 | /* XXX FIXME inpcb/in6pcb vs socket*/ |
| 531 | af = PCB_FAMILY(inp); |
| 532 | IPSEC_ASSERT(af == AF_INET || af == AF_INET6, |
| 533 | ("%s: unexpected protocol family %u" , __func__, af)); |
| 534 | |
| 535 | #ifdef __NetBSD__ |
| 536 | IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache" )); |
| 537 | /* If we have a cached entry, and if it is still valid, use it. */ |
| 538 | IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); |
| 539 | currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); |
| 540 | if (currsp) { |
| 541 | *error = 0; |
| 542 | return currsp; |
| 543 | } |
| 544 | IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); |
| 545 | #endif /* __NetBSD__ */ |
| 546 | |
| 547 | switch (af) { |
| 548 | case AF_INET: { |
| 549 | struct inpcb *in4p = PCB_TO_IN4PCB(inp); |
| 550 | /* set spidx in pcb */ |
| 551 | *error = ipsec4_setspidx_inpcb(m, in4p); |
| 552 | pcbsp = in4p->inp_sp; |
| 553 | break; |
| 554 | } |
| 555 | |
| 556 | #if defined(INET6) |
| 557 | case AF_INET6: { |
| 558 | struct in6pcb *in6p = PCB_TO_IN6PCB(inp); |
| 559 | /* set spidx in pcb */ |
| 560 | *error = ipsec6_setspidx_in6pcb(m, in6p); |
| 561 | pcbsp = in6p->in6p_sp; |
| 562 | break; |
| 563 | } |
| 564 | #endif |
| 565 | default: |
| 566 | *error = EPFNOSUPPORT; |
| 567 | break; |
| 568 | } |
| 569 | if (*error) |
| 570 | return NULL; |
| 571 | |
| 572 | IPSEC_ASSERT(pcbsp != NULL, ("%s: null pcbsp" , __func__)); |
| 573 | switch (dir) { |
| 574 | case IPSEC_DIR_INBOUND: |
| 575 | currsp = pcbsp->sp_in; |
| 576 | break; |
| 577 | case IPSEC_DIR_OUTBOUND: |
| 578 | currsp = pcbsp->sp_out; |
| 579 | break; |
| 580 | } |
| 581 | IPSEC_ASSERT(currsp != NULL, ("%s: null currsp" , __func__)); |
| 582 | |
| 583 | if (pcbsp->priv) { /* when privilieged socket */ |
| 584 | switch (currsp->policy) { |
| 585 | case IPSEC_POLICY_BYPASS: |
| 586 | case IPSEC_POLICY_IPSEC: |
| 587 | currsp->refcnt++; |
| 588 | sp = currsp; |
| 589 | break; |
| 590 | |
| 591 | case IPSEC_POLICY_ENTRUST: |
| 592 | /* look for a policy in SPD */ |
| 593 | sp = KEY_ALLOCSP(&currsp->spidx, dir); |
| 594 | if (sp == NULL) /* no SP found */ |
| 595 | sp = KEY_ALLOCSP_DEFAULT(af); |
| 596 | break; |
| 597 | |
| 598 | default: |
| 599 | ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n" , |
| 600 | __func__, currsp->policy)); |
| 601 | *error = EINVAL; |
| 602 | return NULL; |
| 603 | } |
| 604 | } else { /* unpriv, SPD has policy */ |
| 605 | sp = KEY_ALLOCSP(&currsp->spidx, dir); |
| 606 | if (sp == NULL) { /* no SP found */ |
| 607 | switch (currsp->policy) { |
| 608 | case IPSEC_POLICY_BYPASS: |
| 609 | ipseclog((LOG_ERR, "%s: Illegal policy for " |
| 610 | "non-priviliged defined %d\n" , __func__, |
| 611 | currsp->policy)); |
| 612 | *error = EINVAL; |
| 613 | return NULL; |
| 614 | |
| 615 | case IPSEC_POLICY_ENTRUST: |
| 616 | sp = KEY_ALLOCSP_DEFAULT(af); |
| 617 | break; |
| 618 | |
| 619 | case IPSEC_POLICY_IPSEC: |
| 620 | currsp->refcnt++; |
| 621 | sp = currsp; |
| 622 | break; |
| 623 | |
| 624 | default: |
| 625 | ipseclog((LOG_ERR, "%s: Invalid policy for " |
| 626 | "PCB %d\n" , __func__, currsp->policy)); |
| 627 | *error = EINVAL; |
| 628 | return NULL; |
| 629 | } |
| 630 | } |
| 631 | } |
| 632 | IPSEC_ASSERT(sp != NULL, |
| 633 | ("%s: null SP (priv %u policy %u" , __func__, pcbsp->priv, |
| 634 | currsp->policy)); |
| 635 | KEYDEBUG(KEYDEBUG_IPSEC_STAMP, |
| 636 | printf("DP %s (priv %u policy %u) allocates SP:%p (refcnt %u)\n" , |
| 637 | __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); |
| 638 | #ifdef __NetBSD__ |
| 639 | ipsec_fillpcbcache(pcbsp, m, sp, dir); |
| 640 | #endif /* __NetBSD__ */ |
| 641 | return sp; |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, |
| 646 | * and return a pointer to SP. |
| 647 | * OUT: positive: a pointer to the entry for security policy leaf matched. |
| 648 | * NULL: no apropreate SP found, the following value is set to error. |
| 649 | * 0 : bypass |
| 650 | * EACCES : discard packet. |
| 651 | * ENOENT : ipsec_acquire() in progress, maybe. |
| 652 | * others : error occurred. |
| 653 | */ |
| 654 | struct secpolicy * |
| 655 | ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) |
| 656 | { |
| 657 | struct secpolicyindex spidx; |
| 658 | struct secpolicy *sp; |
| 659 | |
| 660 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 661 | IPSEC_ASSERT(error != NULL, ("%s: null error" , __func__)); |
| 662 | IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, |
| 663 | ("%s: invalid direction %u" , __func__, dir)); |
| 664 | |
| 665 | sp = NULL; |
| 666 | |
| 667 | /* Make an index to look for a policy. */ |
| 668 | *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); |
| 669 | if (*error != 0) { |
| 670 | DPRINTF(("%s: setpidx failed, dir %u flag %u\n" , __func__, |
| 671 | dir, flag)); |
| 672 | memset(&spidx, 0, sizeof (spidx)); |
| 673 | return NULL; |
| 674 | } |
| 675 | |
| 676 | spidx.dir = dir; |
| 677 | |
| 678 | if (key_havesp(dir)) { |
| 679 | sp = KEY_ALLOCSP(&spidx, dir); |
| 680 | } |
| 681 | |
| 682 | if (sp == NULL) /* no SP found, use system default */ |
| 683 | sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family); |
| 684 | IPSEC_ASSERT(sp != NULL, ("%s: null SP" , __func__)); |
| 685 | return sp; |
| 686 | } |
| 687 | |
| 688 | struct secpolicy * |
| 689 | ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, |
| 690 | struct inpcb *inp) |
| 691 | { |
| 692 | struct secpolicy *sp; |
| 693 | |
| 694 | *error = 0; |
| 695 | |
| 696 | |
| 697 | /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ |
| 698 | if (inp == NULL || inp->inp_socket == NULL) { |
| 699 | sp = ipsec_getpolicybyaddr(m, dir, flag, error); |
| 700 | } else |
| 701 | sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); |
| 702 | if (sp == NULL) { |
| 703 | IPSEC_ASSERT(*error != 0, |
| 704 | ("%s: getpolicy failed w/o error" , __func__)); |
| 705 | IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); |
| 706 | return NULL; |
| 707 | } |
| 708 | IPSEC_ASSERT(*error == 0, ("%s: sp w/ error set to %u" , __func__, |
| 709 | *error)); |
| 710 | switch (sp->policy) { |
| 711 | case IPSEC_POLICY_ENTRUST: |
| 712 | default: |
| 713 | printf("%s: invalid policy %u\n" , __func__, sp->policy); |
| 714 | /* fall thru... */ |
| 715 | case IPSEC_POLICY_DISCARD: |
| 716 | IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); |
| 717 | *error = -EINVAL; /* packet is discarded by caller */ |
| 718 | break; |
| 719 | case IPSEC_POLICY_BYPASS: |
| 720 | case IPSEC_POLICY_NONE: |
| 721 | KEY_FREESP(&sp); |
| 722 | sp = NULL; /* NB: force NULL result */ |
| 723 | break; |
| 724 | case IPSEC_POLICY_IPSEC: |
| 725 | if (sp->req == NULL) /* acquire an SA */ |
| 726 | *error = key_spdacquire(sp); |
| 727 | break; |
| 728 | } |
| 729 | if (*error != 0) { |
| 730 | KEY_FREESP(&sp); |
| 731 | sp = NULL; |
| 732 | DPRINTF(("%s: done, error %d\n" , __func__, *error)); |
| 733 | } |
| 734 | return sp; |
| 735 | } |
| 736 | |
| 737 | int |
| 738 | ipsec4_output(struct mbuf *m, struct socket *so, int flags, |
| 739 | struct secpolicy **sp_out, u_long *mtu, bool *natt_frag, bool *done) |
| 740 | { |
| 741 | const struct ip *ip = mtod(m, const struct ip *); |
| 742 | struct secpolicy *sp = NULL; |
| 743 | struct inpcb *inp; |
| 744 | int error, s; |
| 745 | |
| 746 | inp = (so && so->so_proto->pr_domain->dom_family == AF_INET) ? |
| 747 | (struct inpcb *)so->so_pcb : NULL; |
| 748 | |
| 749 | /* |
| 750 | * Check the security policy (SP) for the packet and, if required, |
| 751 | * do IPsec-related processing. There are two cases here; the first |
| 752 | * time a packet is sent through it will be untagged and handled by |
| 753 | * ipsec4_checkpolicy(). If the packet is resubmitted to ip_output |
| 754 | * (e.g. after AH, ESP, etc. processing), there will be a tag to |
| 755 | * bypass the lookup and related policy checking. |
| 756 | */ |
| 757 | if (ipsec_outdone(m)) { |
| 758 | return 0; |
| 759 | } |
| 760 | s = splsoftnet(); |
| 761 | if (inp && IPSEC_PCB_SKIP_IPSEC(inp->inp_sp, IPSEC_DIR_OUTBOUND)) { |
| 762 | splx(s); |
| 763 | return 0; |
| 764 | } |
| 765 | sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, inp); |
| 766 | |
| 767 | /* |
| 768 | * There are four return cases: |
| 769 | * sp != NULL apply IPsec policy |
| 770 | * sp == NULL, error == 0 no IPsec handling needed |
| 771 | * sp == NULL, error == -EINVAL discard packet w/o error |
| 772 | * sp == NULL, error != 0 discard packet, report error |
| 773 | */ |
| 774 | if (sp == NULL) { |
| 775 | splx(s); |
| 776 | if (error) { |
| 777 | /* |
| 778 | * Hack: -EINVAL is used to signal that a packet |
| 779 | * should be silently discarded. This is typically |
| 780 | * because we asked key management for an SA and |
| 781 | * it was delayed (e.g. kicked up to IKE). |
| 782 | */ |
| 783 | if (error == -EINVAL) |
| 784 | error = 0; |
| 785 | m_freem(m); |
| 786 | *done = true; |
| 787 | return error; |
| 788 | } |
| 789 | /* No IPsec processing for this packet. */ |
| 790 | return 0; |
| 791 | } |
| 792 | *sp_out = sp; |
| 793 | |
| 794 | /* |
| 795 | * NAT-T ESP fragmentation: do not do IPSec processing now, |
| 796 | * we will do it on each fragmented packet. |
| 797 | */ |
| 798 | if (sp->req->sav && (sp->req->sav->natt_type & |
| 799 | (UDP_ENCAP_ESPINUDP|UDP_ENCAP_ESPINUDP_NON_IKE))) { |
| 800 | if (ntohs(ip->ip_len) > sp->req->sav->esp_frag) { |
| 801 | *mtu = sp->req->sav->esp_frag; |
| 802 | *natt_frag = true; |
| 803 | splx(s); |
| 804 | return 0; |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | /* |
| 809 | * Do delayed checksums now because we send before |
| 810 | * this is done in the normal processing path. |
| 811 | */ |
| 812 | if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { |
| 813 | in_delayed_cksum(m); |
| 814 | m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); |
| 815 | } |
| 816 | |
| 817 | /* Note: callee frees mbuf */ |
| 818 | error = ipsec4_process_packet(m, sp->req, flags, 0); |
| 819 | /* |
| 820 | * Preserve KAME behaviour: ENOENT can be returned |
| 821 | * when an SA acquire is in progress. Don't propagate |
| 822 | * this to user-level; it confuses applications. |
| 823 | * |
| 824 | * XXX this will go away when the SADB is redone. |
| 825 | */ |
| 826 | if (error == ENOENT) |
| 827 | error = 0; |
| 828 | splx(s); |
| 829 | *done = true; |
| 830 | return error; |
| 831 | } |
| 832 | |
| 833 | int |
| 834 | ipsec4_input(struct mbuf *m, int flags) |
| 835 | { |
| 836 | struct m_tag *mtag; |
| 837 | struct tdb_ident *tdbi; |
| 838 | struct secpolicy *sp; |
| 839 | int error, s; |
| 840 | |
| 841 | /* |
| 842 | * Check if the packet has already had IPsec processing done. |
| 843 | * If so, then just pass it along. This tag gets set during AH, |
| 844 | * ESP, etc. input handling, before the packet is returned to |
| 845 | * the IP input queue for delivery. |
| 846 | */ |
| 847 | mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); |
| 848 | s = splsoftnet(); |
| 849 | if (mtag != NULL) { |
| 850 | tdbi = (struct tdb_ident *)(mtag + 1); |
| 851 | sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); |
| 852 | } else { |
| 853 | sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, |
| 854 | IP_FORWARDING, &error); |
| 855 | } |
| 856 | if (sp == NULL) { |
| 857 | splx(s); |
| 858 | return EINVAL; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Check security policy against packet attributes. |
| 863 | */ |
| 864 | error = ipsec_in_reject(sp, m); |
| 865 | KEY_FREESP(&sp); |
| 866 | splx(s); |
| 867 | if (error) { |
| 868 | return error; |
| 869 | } |
| 870 | |
| 871 | if (flags == 0) { |
| 872 | /* We are done. */ |
| 873 | return 0; |
| 874 | } |
| 875 | |
| 876 | /* |
| 877 | * Peek at the outbound SP for this packet to determine if |
| 878 | * it is a Fast Forward candidate. |
| 879 | */ |
| 880 | mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); |
| 881 | if (mtag != NULL) { |
| 882 | m->m_flags &= ~M_CANFASTFWD; |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | s = splsoftnet(); |
| 887 | sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, NULL); |
| 888 | if (sp != NULL) { |
| 889 | m->m_flags &= ~M_CANFASTFWD; |
| 890 | KEY_FREESP(&sp); |
| 891 | } |
| 892 | splx(s); |
| 893 | return 0; |
| 894 | } |
| 895 | |
| 896 | int |
| 897 | ipsec4_forward(struct mbuf *m, int *destmtu) |
| 898 | { |
| 899 | /* |
| 900 | * If the packet is routed over IPsec tunnel, tell the |
| 901 | * originator the tunnel MTU. |
| 902 | * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz |
| 903 | * XXX quickhack!!! |
| 904 | */ |
| 905 | struct secpolicy *sp; |
| 906 | size_t ipsechdr; |
| 907 | int error; |
| 908 | |
| 909 | sp = ipsec4_getpolicybyaddr(m, |
| 910 | IPSEC_DIR_OUTBOUND, IP_FORWARDING, &error); |
| 911 | if (sp == NULL) { |
| 912 | return EINVAL; |
| 913 | } |
| 914 | |
| 915 | /* Count IPsec header size. */ |
| 916 | ipsechdr = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, NULL); |
| 917 | |
| 918 | /* |
| 919 | * Find the correct route for outer IPv4 header, compute tunnel MTU. |
| 920 | */ |
| 921 | if (sp->req && sp->req->sav && sp->req->sav->sah) { |
| 922 | struct route *ro; |
| 923 | struct rtentry *rt; |
| 924 | |
| 925 | ro = &sp->req->sav->sah->sa_route; |
| 926 | rt = rtcache_validate(ro); |
| 927 | if (rt && rt->rt_ifp) { |
| 928 | *destmtu = rt->rt_rmx.rmx_mtu ? |
| 929 | rt->rt_rmx.rmx_mtu : rt->rt_ifp->if_mtu; |
| 930 | *destmtu -= ipsechdr; |
| 931 | } |
| 932 | } |
| 933 | KEY_FREESP(&sp); |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | #ifdef INET6 |
| 938 | struct secpolicy * |
| 939 | ipsec6_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, |
| 940 | struct in6pcb *in6p) |
| 941 | { |
| 942 | struct secpolicy *sp; |
| 943 | |
| 944 | *error = 0; |
| 945 | |
| 946 | |
| 947 | /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ |
| 948 | if (in6p == NULL || in6p->in6p_socket == NULL) { |
| 949 | sp = ipsec_getpolicybyaddr(m, dir, flag, error); |
| 950 | } else |
| 951 | sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); |
| 952 | if (sp == NULL) { |
| 953 | IPSEC_ASSERT(*error != 0, ("%s: getpolicy failed w/o error" , |
| 954 | __func__)); |
| 955 | IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); |
| 956 | return NULL; |
| 957 | } |
| 958 | IPSEC_ASSERT(*error == 0, ("%s: sp w/ error set to %u" , __func__, |
| 959 | *error)); |
| 960 | switch (sp->policy) { |
| 961 | case IPSEC_POLICY_ENTRUST: |
| 962 | default: |
| 963 | printf("%s: invalid policy %u\n" , __func__, sp->policy); |
| 964 | /* fall thru... */ |
| 965 | case IPSEC_POLICY_DISCARD: |
| 966 | IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); |
| 967 | *error = -EINVAL; /* packet is discarded by caller */ |
| 968 | break; |
| 969 | case IPSEC_POLICY_BYPASS: |
| 970 | case IPSEC_POLICY_NONE: |
| 971 | KEY_FREESP(&sp); |
| 972 | sp = NULL; /* NB: force NULL result */ |
| 973 | break; |
| 974 | case IPSEC_POLICY_IPSEC: |
| 975 | if (sp->req == NULL) /* acquire an SA */ |
| 976 | *error = key_spdacquire(sp); |
| 977 | break; |
| 978 | } |
| 979 | if (*error != 0) { |
| 980 | KEY_FREESP(&sp); |
| 981 | sp = NULL; |
| 982 | DPRINTF(("%s: done, error %d\n" , __func__, *error)); |
| 983 | } |
| 984 | return sp; |
| 985 | } |
| 986 | #endif /* INET6 */ |
| 987 | |
| 988 | static int |
| 989 | ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) |
| 990 | { |
| 991 | int error; |
| 992 | |
| 993 | IPSEC_ASSERT(pcb != NULL, ("%s: null pcb" , __func__)); |
| 994 | IPSEC_ASSERT(pcb->inp_sp != NULL, ("%s: null inp_sp" , __func__)); |
| 995 | IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, |
| 996 | ("%s: null sp_in || sp_out" , __func__)); |
| 997 | |
| 998 | error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); |
| 999 | if (error == 0) { |
| 1000 | pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; |
| 1001 | pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; |
| 1002 | pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; |
| 1003 | } else { |
| 1004 | memset(&pcb->inp_sp->sp_in->spidx, 0, |
| 1005 | sizeof (pcb->inp_sp->sp_in->spidx)); |
| 1006 | memset(&pcb->inp_sp->sp_out->spidx, 0, |
| 1007 | sizeof (pcb->inp_sp->sp_in->spidx)); |
| 1008 | } |
| 1009 | return error; |
| 1010 | } |
| 1011 | |
| 1012 | #ifdef INET6 |
| 1013 | static int |
| 1014 | ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) |
| 1015 | { |
| 1016 | struct secpolicyindex *spidx; |
| 1017 | int error; |
| 1018 | |
| 1019 | IPSEC_ASSERT(pcb != NULL, ("%s: null pcb" , __func__)); |
| 1020 | IPSEC_ASSERT(pcb->in6p_sp != NULL, ("%s: null inp_sp" , __func__)); |
| 1021 | IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && |
| 1022 | pcb->in6p_sp->sp_in != NULL, ("%s: null sp_in || sp_out" , |
| 1023 | __func__)); |
| 1024 | |
| 1025 | memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); |
| 1026 | memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); |
| 1027 | |
| 1028 | spidx = &pcb->in6p_sp->sp_in->spidx; |
| 1029 | error = ipsec_setspidx(m, spidx, 1); |
| 1030 | if (error) |
| 1031 | goto bad; |
| 1032 | spidx->dir = IPSEC_DIR_INBOUND; |
| 1033 | |
| 1034 | spidx = &pcb->in6p_sp->sp_out->spidx; |
| 1035 | error = ipsec_setspidx(m, spidx, 1); |
| 1036 | if (error) |
| 1037 | goto bad; |
| 1038 | spidx->dir = IPSEC_DIR_OUTBOUND; |
| 1039 | |
| 1040 | return 0; |
| 1041 | |
| 1042 | bad: |
| 1043 | memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); |
| 1044 | memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); |
| 1045 | return error; |
| 1046 | } |
| 1047 | #endif |
| 1048 | |
| 1049 | /* |
| 1050 | * configure security policy index (src/dst/proto/sport/dport) |
| 1051 | * by looking at the content of mbuf. |
| 1052 | * the caller is responsible for error recovery (like clearing up spidx). |
| 1053 | */ |
| 1054 | static int |
| 1055 | ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) |
| 1056 | { |
| 1057 | struct ip *ip = NULL; |
| 1058 | struct ip ipbuf; |
| 1059 | u_int v; |
| 1060 | struct mbuf *n; |
| 1061 | int len; |
| 1062 | int error; |
| 1063 | |
| 1064 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 1065 | |
| 1066 | /* |
| 1067 | * validate m->m_pkthdr.len. we see incorrect length if we |
| 1068 | * mistakenly call this function with inconsistent mbuf chain |
| 1069 | * (like 4.4BSD tcp/udp processing). XXX should we panic here? |
| 1070 | */ |
| 1071 | len = 0; |
| 1072 | for (n = m; n; n = n->m_next) |
| 1073 | len += n->m_len; |
| 1074 | if (m->m_pkthdr.len != len) { |
| 1075 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: total of m_len(%d) " |
| 1076 | "!= pkthdr.len(%d), ignored.\n" , __func__, len, |
| 1077 | m->m_pkthdr.len)); |
| 1078 | return EINVAL; |
| 1079 | } |
| 1080 | |
| 1081 | if (m->m_pkthdr.len < sizeof(struct ip)) { |
| 1082 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: pkthdr.len(%d) < " |
| 1083 | "sizeof(struct ip), ignored.\n" , __func__, |
| 1084 | m->m_pkthdr.len)); |
| 1085 | return EINVAL; |
| 1086 | } |
| 1087 | |
| 1088 | if (m->m_len >= sizeof(*ip)) |
| 1089 | ip = mtod(m, struct ip *); |
| 1090 | else { |
| 1091 | m_copydata(m, 0, sizeof(ipbuf), &ipbuf); |
| 1092 | ip = &ipbuf; |
| 1093 | } |
| 1094 | v = ip->ip_v; |
| 1095 | switch (v) { |
| 1096 | case 4: |
| 1097 | error = ipsec4_setspidx_ipaddr(m, spidx); |
| 1098 | if (error) |
| 1099 | return error; |
| 1100 | ipsec4_get_ulp(m, spidx, needport); |
| 1101 | return 0; |
| 1102 | #ifdef INET6 |
| 1103 | case 6: |
| 1104 | if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { |
| 1105 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: " |
| 1106 | "pkthdr.len(%d) < sizeof(struct ip6_hdr), " |
| 1107 | "ignored.\n" , __func__, m->m_pkthdr.len)); |
| 1108 | return EINVAL; |
| 1109 | } |
| 1110 | error = ipsec6_setspidx_ipaddr(m, spidx); |
| 1111 | if (error) |
| 1112 | return error; |
| 1113 | ipsec6_get_ulp(m, spidx, needport); |
| 1114 | return 0; |
| 1115 | #endif |
| 1116 | default: |
| 1117 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: unknown IP version " |
| 1118 | "%u, ignored.\n" , __func__, v)); |
| 1119 | return EINVAL; |
| 1120 | } |
| 1121 | } |
| 1122 | |
| 1123 | static void |
| 1124 | ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) |
| 1125 | { |
| 1126 | u_int8_t nxt; |
| 1127 | int off; |
| 1128 | |
| 1129 | /* sanity check */ |
| 1130 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 1131 | IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), |
| 1132 | ("%s: packet too short" , __func__)); |
| 1133 | |
| 1134 | /* NB: ip_input() flips it into host endian XXX need more checking */ |
| 1135 | if (m->m_len >= sizeof(struct ip)) { |
| 1136 | struct ip *ip = mtod(m, struct ip *); |
| 1137 | if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) |
| 1138 | goto done; |
| 1139 | off = ip->ip_hl << 2; |
| 1140 | nxt = ip->ip_p; |
| 1141 | } else { |
| 1142 | struct ip ih; |
| 1143 | |
| 1144 | m_copydata(m, 0, sizeof (struct ip), &ih); |
| 1145 | if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) |
| 1146 | goto done; |
| 1147 | off = ih.ip_hl << 2; |
| 1148 | nxt = ih.ip_p; |
| 1149 | } |
| 1150 | |
| 1151 | while (off < m->m_pkthdr.len) { |
| 1152 | struct ip6_ext ip6e; |
| 1153 | struct tcphdr th; |
| 1154 | struct udphdr uh; |
| 1155 | struct icmp icmph; |
| 1156 | |
| 1157 | switch (nxt) { |
| 1158 | case IPPROTO_TCP: |
| 1159 | spidx->ul_proto = nxt; |
| 1160 | if (!needport) |
| 1161 | goto done_proto; |
| 1162 | if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) |
| 1163 | goto done; |
| 1164 | m_copydata(m, off, sizeof (th), &th); |
| 1165 | spidx->src.sin.sin_port = th.th_sport; |
| 1166 | spidx->dst.sin.sin_port = th.th_dport; |
| 1167 | return; |
| 1168 | case IPPROTO_UDP: |
| 1169 | spidx->ul_proto = nxt; |
| 1170 | if (!needport) |
| 1171 | goto done_proto; |
| 1172 | if (off + sizeof(struct udphdr) > m->m_pkthdr.len) |
| 1173 | goto done; |
| 1174 | m_copydata(m, off, sizeof (uh), &uh); |
| 1175 | spidx->src.sin.sin_port = uh.uh_sport; |
| 1176 | spidx->dst.sin.sin_port = uh.uh_dport; |
| 1177 | return; |
| 1178 | case IPPROTO_AH: |
| 1179 | if (m->m_pkthdr.len > off + sizeof(ip6e)) |
| 1180 | goto done; |
| 1181 | /* XXX sigh, this works but is totally bogus */ |
| 1182 | m_copydata(m, off, sizeof(ip6e), &ip6e); |
| 1183 | off += (ip6e.ip6e_len + 2) << 2; |
| 1184 | nxt = ip6e.ip6e_nxt; |
| 1185 | break; |
| 1186 | case IPPROTO_ICMP: |
| 1187 | spidx->ul_proto = nxt; |
| 1188 | if (off + sizeof(struct icmp) > m->m_pkthdr.len) |
| 1189 | return; |
| 1190 | m_copydata(m, off, sizeof(icmph), &icmph); |
| 1191 | ((struct sockaddr_in *)&spidx->src)->sin_port = |
| 1192 | htons((uint16_t)icmph.icmp_type); |
| 1193 | ((struct sockaddr_in *)&spidx->dst)->sin_port = |
| 1194 | htons((uint16_t)icmph.icmp_code); |
| 1195 | return; |
| 1196 | default: |
| 1197 | /* XXX intermediate headers??? */ |
| 1198 | spidx->ul_proto = nxt; |
| 1199 | goto done_proto; |
| 1200 | } |
| 1201 | } |
| 1202 | done: |
| 1203 | spidx->ul_proto = IPSEC_ULPROTO_ANY; |
| 1204 | done_proto: |
| 1205 | spidx->src.sin.sin_port = IPSEC_PORT_ANY; |
| 1206 | spidx->dst.sin.sin_port = IPSEC_PORT_ANY; |
| 1207 | } |
| 1208 | |
| 1209 | /* assumes that m is sane */ |
| 1210 | static int |
| 1211 | ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) |
| 1212 | { |
| 1213 | static const struct sockaddr_in template = { |
| 1214 | sizeof (struct sockaddr_in), |
| 1215 | AF_INET, |
| 1216 | 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } |
| 1217 | }; |
| 1218 | |
| 1219 | spidx->src.sin = template; |
| 1220 | spidx->dst.sin = template; |
| 1221 | |
| 1222 | if (m->m_len < sizeof (struct ip)) { |
| 1223 | m_copydata(m, offsetof(struct ip, ip_src), |
| 1224 | sizeof (struct in_addr), |
| 1225 | &spidx->src.sin.sin_addr); |
| 1226 | m_copydata(m, offsetof(struct ip, ip_dst), |
| 1227 | sizeof (struct in_addr), |
| 1228 | &spidx->dst.sin.sin_addr); |
| 1229 | } else { |
| 1230 | struct ip *ip = mtod(m, struct ip *); |
| 1231 | spidx->src.sin.sin_addr = ip->ip_src; |
| 1232 | spidx->dst.sin.sin_addr = ip->ip_dst; |
| 1233 | } |
| 1234 | |
| 1235 | spidx->prefs = sizeof(struct in_addr) << 3; |
| 1236 | spidx->prefd = sizeof(struct in_addr) << 3; |
| 1237 | |
| 1238 | return 0; |
| 1239 | } |
| 1240 | |
| 1241 | #ifdef INET6 |
| 1242 | static void |
| 1243 | ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, |
| 1244 | int needport) |
| 1245 | { |
| 1246 | int off, nxt; |
| 1247 | struct tcphdr th; |
| 1248 | struct udphdr uh; |
| 1249 | struct icmp6_hdr icmph; |
| 1250 | |
| 1251 | /* sanity check */ |
| 1252 | if (m == NULL) |
| 1253 | panic("%s: NULL pointer was passed" , __func__); |
| 1254 | |
| 1255 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s:\n" , __func__); |
| 1256 | kdebug_mbuf(m)); |
| 1257 | |
| 1258 | /* set default */ |
| 1259 | spidx->ul_proto = IPSEC_ULPROTO_ANY; |
| 1260 | ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; |
| 1261 | ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; |
| 1262 | |
| 1263 | nxt = -1; |
| 1264 | off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); |
| 1265 | if (off < 0 || m->m_pkthdr.len < off) |
| 1266 | return; |
| 1267 | |
| 1268 | switch (nxt) { |
| 1269 | case IPPROTO_TCP: |
| 1270 | spidx->ul_proto = nxt; |
| 1271 | if (!needport) |
| 1272 | break; |
| 1273 | if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) |
| 1274 | break; |
| 1275 | m_copydata(m, off, sizeof(th), &th); |
| 1276 | ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; |
| 1277 | ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; |
| 1278 | break; |
| 1279 | case IPPROTO_UDP: |
| 1280 | spidx->ul_proto = nxt; |
| 1281 | if (!needport) |
| 1282 | break; |
| 1283 | if (off + sizeof(struct udphdr) > m->m_pkthdr.len) |
| 1284 | break; |
| 1285 | m_copydata(m, off, sizeof(uh), &uh); |
| 1286 | ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; |
| 1287 | ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; |
| 1288 | break; |
| 1289 | case IPPROTO_ICMPV6: |
| 1290 | spidx->ul_proto = nxt; |
| 1291 | if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) |
| 1292 | break; |
| 1293 | m_copydata(m, off, sizeof(icmph), &icmph); |
| 1294 | ((struct sockaddr_in6 *)&spidx->src)->sin6_port = |
| 1295 | htons((uint16_t)icmph.icmp6_type); |
| 1296 | ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = |
| 1297 | htons((uint16_t)icmph.icmp6_code); |
| 1298 | break; |
| 1299 | default: |
| 1300 | /* XXX intermediate headers??? */ |
| 1301 | spidx->ul_proto = nxt; |
| 1302 | break; |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | /* assumes that m is sane */ |
| 1307 | static int |
| 1308 | ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) |
| 1309 | { |
| 1310 | struct ip6_hdr *ip6 = NULL; |
| 1311 | struct ip6_hdr ip6buf; |
| 1312 | struct sockaddr_in6 *sin6; |
| 1313 | |
| 1314 | if (m->m_len >= sizeof(*ip6)) |
| 1315 | ip6 = mtod(m, struct ip6_hdr *); |
| 1316 | else { |
| 1317 | m_copydata(m, 0, sizeof(ip6buf), &ip6buf); |
| 1318 | ip6 = &ip6buf; |
| 1319 | } |
| 1320 | |
| 1321 | sin6 = (struct sockaddr_in6 *)&spidx->src; |
| 1322 | memset(sin6, 0, sizeof(*sin6)); |
| 1323 | sin6->sin6_family = AF_INET6; |
| 1324 | sin6->sin6_len = sizeof(struct sockaddr_in6); |
| 1325 | memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); |
| 1326 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { |
| 1327 | sin6->sin6_addr.s6_addr16[1] = 0; |
| 1328 | sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); |
| 1329 | } |
| 1330 | spidx->prefs = sizeof(struct in6_addr) << 3; |
| 1331 | |
| 1332 | sin6 = (struct sockaddr_in6 *)&spidx->dst; |
| 1333 | memset(sin6, 0, sizeof(*sin6)); |
| 1334 | sin6->sin6_family = AF_INET6; |
| 1335 | sin6->sin6_len = sizeof(struct sockaddr_in6); |
| 1336 | memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); |
| 1337 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { |
| 1338 | sin6->sin6_addr.s6_addr16[1] = 0; |
| 1339 | sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); |
| 1340 | } |
| 1341 | spidx->prefd = sizeof(struct in6_addr) << 3; |
| 1342 | |
| 1343 | return 0; |
| 1344 | } |
| 1345 | #endif |
| 1346 | |
| 1347 | static void |
| 1348 | ipsec_delpcbpolicy(struct inpcbpolicy *p) |
| 1349 | { |
| 1350 | free(p, M_SECA); |
| 1351 | } |
| 1352 | |
| 1353 | /* initialize policy in PCB */ |
| 1354 | int |
| 1355 | ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) |
| 1356 | { |
| 1357 | struct inpcbpolicy *new; |
| 1358 | |
| 1359 | /* sanity check. */ |
| 1360 | if (so == NULL || policy == NULL) |
| 1361 | panic("%s: NULL pointer was passed" , __func__); |
| 1362 | |
| 1363 | new = malloc(sizeof(*new), M_SECA, M_NOWAIT|M_ZERO); |
| 1364 | if (new == NULL) { |
| 1365 | ipseclog((LOG_DEBUG, "%s: No more memory.\n" , __func__)); |
| 1366 | return ENOBUFS; |
| 1367 | } |
| 1368 | |
| 1369 | if (IPSEC_PRIVILEGED_SO(so)) |
| 1370 | new->priv = 1; |
| 1371 | else |
| 1372 | new->priv = 0; |
| 1373 | |
| 1374 | if ((new->sp_in = KEY_NEWSP()) == NULL) { |
| 1375 | ipsec_delpcbpolicy(new); |
| 1376 | return ENOBUFS; |
| 1377 | } |
| 1378 | new->sp_in->state = IPSEC_SPSTATE_ALIVE; |
| 1379 | new->sp_in->policy = IPSEC_POLICY_ENTRUST; |
| 1380 | |
| 1381 | if ((new->sp_out = KEY_NEWSP()) == NULL) { |
| 1382 | KEY_FREESP(&new->sp_in); |
| 1383 | ipsec_delpcbpolicy(new); |
| 1384 | return ENOBUFS; |
| 1385 | } |
| 1386 | new->sp_out->state = IPSEC_SPSTATE_ALIVE; |
| 1387 | new->sp_out->policy = IPSEC_POLICY_ENTRUST; |
| 1388 | |
| 1389 | *policy = new; |
| 1390 | |
| 1391 | return 0; |
| 1392 | } |
| 1393 | |
| 1394 | /* copy old ipsec policy into new */ |
| 1395 | int |
| 1396 | ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) |
| 1397 | { |
| 1398 | struct secpolicy *sp; |
| 1399 | |
| 1400 | sp = ipsec_deepcopy_policy(old->sp_in); |
| 1401 | if (sp) { |
| 1402 | KEY_FREESP(&new->sp_in); |
| 1403 | new->sp_in = sp; |
| 1404 | } else |
| 1405 | return ENOBUFS; |
| 1406 | |
| 1407 | sp = ipsec_deepcopy_policy(old->sp_out); |
| 1408 | if (sp) { |
| 1409 | KEY_FREESP(&new->sp_out); |
| 1410 | new->sp_out = sp; |
| 1411 | } else |
| 1412 | return ENOBUFS; |
| 1413 | |
| 1414 | new->priv = old->priv; |
| 1415 | |
| 1416 | return 0; |
| 1417 | } |
| 1418 | |
| 1419 | /* deep-copy a policy in PCB */ |
| 1420 | static struct secpolicy * |
| 1421 | ipsec_deepcopy_policy(const struct secpolicy *src) |
| 1422 | { |
| 1423 | struct ipsecrequest *newchain = NULL; |
| 1424 | const struct ipsecrequest *p; |
| 1425 | struct ipsecrequest **q; |
| 1426 | struct ipsecrequest *r; |
| 1427 | struct secpolicy *dst; |
| 1428 | |
| 1429 | if (src == NULL) |
| 1430 | return NULL; |
| 1431 | dst = KEY_NEWSP(); |
| 1432 | if (dst == NULL) |
| 1433 | return NULL; |
| 1434 | |
| 1435 | /* |
| 1436 | * deep-copy IPsec request chain. This is required since struct |
| 1437 | * ipsecrequest is not reference counted. |
| 1438 | */ |
| 1439 | q = &newchain; |
| 1440 | for (p = src->req; p; p = p->next) { |
| 1441 | *q = malloc(sizeof(**q), M_SECA, M_NOWAIT|M_ZERO); |
| 1442 | if (*q == NULL) |
| 1443 | goto fail; |
| 1444 | (*q)->next = NULL; |
| 1445 | |
| 1446 | (*q)->saidx.proto = p->saidx.proto; |
| 1447 | (*q)->saidx.mode = p->saidx.mode; |
| 1448 | (*q)->level = p->level; |
| 1449 | (*q)->saidx.reqid = p->saidx.reqid; |
| 1450 | |
| 1451 | memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); |
| 1452 | memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); |
| 1453 | |
| 1454 | (*q)->sav = NULL; |
| 1455 | (*q)->sp = dst; |
| 1456 | |
| 1457 | q = &((*q)->next); |
| 1458 | } |
| 1459 | |
| 1460 | dst->req = newchain; |
| 1461 | dst->state = src->state; |
| 1462 | dst->policy = src->policy; |
| 1463 | /* do not touch the refcnt fields */ |
| 1464 | |
| 1465 | return dst; |
| 1466 | |
| 1467 | fail: |
| 1468 | for (q = &newchain; *q; q = &r) { |
| 1469 | r = (*q)->next; |
| 1470 | free(*q, M_SECA); |
| 1471 | } |
| 1472 | return NULL; |
| 1473 | } |
| 1474 | |
| 1475 | /* set policy and ipsec request if present. */ |
| 1476 | static int |
| 1477 | ipsec_set_policy( |
| 1478 | struct secpolicy **policy, |
| 1479 | int optname, |
| 1480 | const void *request, |
| 1481 | size_t len, |
| 1482 | kauth_cred_t cred |
| 1483 | ) |
| 1484 | { |
| 1485 | const struct sadb_x_policy *xpl; |
| 1486 | struct secpolicy *newsp = NULL; |
| 1487 | int error; |
| 1488 | |
| 1489 | /* sanity check. */ |
| 1490 | if (policy == NULL || *policy == NULL || request == NULL) |
| 1491 | return EINVAL; |
| 1492 | if (len < sizeof(*xpl)) |
| 1493 | return EINVAL; |
| 1494 | xpl = (const struct sadb_x_policy *)request; |
| 1495 | |
| 1496 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: passed policy\n" , __func__); |
| 1497 | kdebug_sadb_x_policy((const struct sadb_ext *)xpl)); |
| 1498 | |
| 1499 | /* check policy type */ |
| 1500 | /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ |
| 1501 | if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD |
| 1502 | || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) |
| 1503 | return EINVAL; |
| 1504 | |
| 1505 | /* check privileged socket */ |
| 1506 | if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { |
| 1507 | error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, |
| 1508 | KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); |
| 1509 | if (error) |
| 1510 | return (error); |
| 1511 | } |
| 1512 | |
| 1513 | /* allocation new SP entry */ |
| 1514 | if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) |
| 1515 | return error; |
| 1516 | |
| 1517 | newsp->state = IPSEC_SPSTATE_ALIVE; |
| 1518 | |
| 1519 | /* clear old SP and set new SP */ |
| 1520 | KEY_FREESP(policy); |
| 1521 | *policy = newsp; |
| 1522 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s: new policy\n" , __func__); |
| 1523 | kdebug_secpolicy(newsp)); |
| 1524 | |
| 1525 | return 0; |
| 1526 | } |
| 1527 | |
| 1528 | static int |
| 1529 | ipsec_get_policy(struct secpolicy *policy, struct mbuf **mp) |
| 1530 | { |
| 1531 | |
| 1532 | /* sanity check. */ |
| 1533 | if (policy == NULL || mp == NULL) |
| 1534 | return EINVAL; |
| 1535 | |
| 1536 | *mp = key_sp2msg(policy); |
| 1537 | if (!*mp) { |
| 1538 | ipseclog((LOG_DEBUG, "%s: No more memory.\n" , __func__)); |
| 1539 | return ENOBUFS; |
| 1540 | } |
| 1541 | |
| 1542 | (*mp)->m_type = MT_DATA; |
| 1543 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("%s:\n" , __func__); |
| 1544 | kdebug_mbuf(*mp)); |
| 1545 | |
| 1546 | return 0; |
| 1547 | } |
| 1548 | |
| 1549 | int |
| 1550 | ipsec4_set_policy(struct inpcb *inp, int optname, const void *request, |
| 1551 | size_t len, kauth_cred_t cred) |
| 1552 | { |
| 1553 | const struct sadb_x_policy *xpl; |
| 1554 | struct secpolicy **policy; |
| 1555 | |
| 1556 | /* sanity check. */ |
| 1557 | if (inp == NULL || request == NULL) |
| 1558 | return EINVAL; |
| 1559 | if (len < sizeof(*xpl)) |
| 1560 | return EINVAL; |
| 1561 | xpl = (const struct sadb_x_policy *)request; |
| 1562 | |
| 1563 | IPSEC_ASSERT(inp->inp_sp != NULL, ("%s: null inp->in_sp" , __func__)); |
| 1564 | |
| 1565 | /* select direction */ |
| 1566 | switch (xpl->sadb_x_policy_dir) { |
| 1567 | case IPSEC_DIR_INBOUND: |
| 1568 | policy = &inp->inp_sp->sp_in; |
| 1569 | break; |
| 1570 | case IPSEC_DIR_OUTBOUND: |
| 1571 | policy = &inp->inp_sp->sp_out; |
| 1572 | break; |
| 1573 | default: |
| 1574 | ipseclog((LOG_ERR, "%s: invalid direction=%u\n" , __func__, |
| 1575 | xpl->sadb_x_policy_dir)); |
| 1576 | return EINVAL; |
| 1577 | } |
| 1578 | |
| 1579 | return ipsec_set_policy(policy, optname, request, len, cred); |
| 1580 | } |
| 1581 | |
| 1582 | int |
| 1583 | ipsec4_get_policy(struct inpcb *inp, const void *request, size_t len, |
| 1584 | struct mbuf **mp) |
| 1585 | { |
| 1586 | const struct sadb_x_policy *xpl; |
| 1587 | struct secpolicy *policy; |
| 1588 | |
| 1589 | /* sanity check. */ |
| 1590 | if (inp == NULL || request == NULL || mp == NULL) |
| 1591 | return EINVAL; |
| 1592 | IPSEC_ASSERT(inp->inp_sp != NULL, ("%s: null inp_sp" , __func__)); |
| 1593 | if (len < sizeof(*xpl)) |
| 1594 | return EINVAL; |
| 1595 | xpl = (const struct sadb_x_policy *)request; |
| 1596 | |
| 1597 | /* select direction */ |
| 1598 | switch (xpl->sadb_x_policy_dir) { |
| 1599 | case IPSEC_DIR_INBOUND: |
| 1600 | policy = inp->inp_sp->sp_in; |
| 1601 | break; |
| 1602 | case IPSEC_DIR_OUTBOUND: |
| 1603 | policy = inp->inp_sp->sp_out; |
| 1604 | break; |
| 1605 | default: |
| 1606 | ipseclog((LOG_ERR, "%s: invalid direction=%u\n" , __func__, |
| 1607 | xpl->sadb_x_policy_dir)); |
| 1608 | return EINVAL; |
| 1609 | } |
| 1610 | |
| 1611 | return ipsec_get_policy(policy, mp); |
| 1612 | } |
| 1613 | |
| 1614 | /* delete policy in PCB */ |
| 1615 | int |
| 1616 | ipsec4_delete_pcbpolicy(struct inpcb *inp) |
| 1617 | { |
| 1618 | IPSEC_ASSERT(inp != NULL, ("%s: null inp" , __func__)); |
| 1619 | |
| 1620 | if (inp->inp_sp == NULL) |
| 1621 | return 0; |
| 1622 | |
| 1623 | if (inp->inp_sp->sp_in != NULL) |
| 1624 | KEY_FREESP(&inp->inp_sp->sp_in); |
| 1625 | |
| 1626 | if (inp->inp_sp->sp_out != NULL) |
| 1627 | KEY_FREESP(&inp->inp_sp->sp_out); |
| 1628 | |
| 1629 | #ifdef __NetBSD__ |
| 1630 | ipsec_invalpcbcache(inp->inp_sp, IPSEC_DIR_ANY); |
| 1631 | #endif |
| 1632 | |
| 1633 | ipsec_delpcbpolicy(inp->inp_sp); |
| 1634 | inp->inp_sp = NULL; |
| 1635 | |
| 1636 | return 0; |
| 1637 | } |
| 1638 | |
| 1639 | #ifdef INET6 |
| 1640 | int |
| 1641 | ipsec6_set_policy(struct in6pcb *in6p, int optname, const void *request, |
| 1642 | size_t len, kauth_cred_t cred) |
| 1643 | { |
| 1644 | const struct sadb_x_policy *xpl; |
| 1645 | struct secpolicy **policy; |
| 1646 | |
| 1647 | /* sanity check. */ |
| 1648 | if (in6p == NULL || request == NULL) |
| 1649 | return EINVAL; |
| 1650 | if (len < sizeof(*xpl)) |
| 1651 | return EINVAL; |
| 1652 | xpl = (const struct sadb_x_policy *)request; |
| 1653 | |
| 1654 | /* select direction */ |
| 1655 | switch (xpl->sadb_x_policy_dir) { |
| 1656 | case IPSEC_DIR_INBOUND: |
| 1657 | policy = &in6p->in6p_sp->sp_in; |
| 1658 | break; |
| 1659 | case IPSEC_DIR_OUTBOUND: |
| 1660 | policy = &in6p->in6p_sp->sp_out; |
| 1661 | break; |
| 1662 | default: |
| 1663 | ipseclog((LOG_ERR, "%s: invalid direction=%u\n" , __func__, |
| 1664 | xpl->sadb_x_policy_dir)); |
| 1665 | return EINVAL; |
| 1666 | } |
| 1667 | |
| 1668 | return ipsec_set_policy(policy, optname, request, len, cred); |
| 1669 | } |
| 1670 | |
| 1671 | int |
| 1672 | ipsec6_get_policy(struct in6pcb *in6p, const void *request, size_t len, |
| 1673 | struct mbuf **mp) |
| 1674 | { |
| 1675 | const struct sadb_x_policy *xpl; |
| 1676 | struct secpolicy *policy; |
| 1677 | |
| 1678 | /* sanity check. */ |
| 1679 | if (in6p == NULL || request == NULL || mp == NULL) |
| 1680 | return EINVAL; |
| 1681 | IPSEC_ASSERT(in6p->in6p_sp != NULL, ("%s: null in6p_sp" , __func__)); |
| 1682 | if (len < sizeof(*xpl)) |
| 1683 | return EINVAL; |
| 1684 | xpl = (const struct sadb_x_policy *)request; |
| 1685 | |
| 1686 | /* select direction */ |
| 1687 | switch (xpl->sadb_x_policy_dir) { |
| 1688 | case IPSEC_DIR_INBOUND: |
| 1689 | policy = in6p->in6p_sp->sp_in; |
| 1690 | break; |
| 1691 | case IPSEC_DIR_OUTBOUND: |
| 1692 | policy = in6p->in6p_sp->sp_out; |
| 1693 | break; |
| 1694 | default: |
| 1695 | ipseclog((LOG_ERR, "%s: invalid direction=%u\n" , __func__, |
| 1696 | xpl->sadb_x_policy_dir)); |
| 1697 | return EINVAL; |
| 1698 | } |
| 1699 | |
| 1700 | return ipsec_get_policy(policy, mp); |
| 1701 | } |
| 1702 | |
| 1703 | int |
| 1704 | ipsec6_delete_pcbpolicy(struct in6pcb *in6p) |
| 1705 | { |
| 1706 | IPSEC_ASSERT(in6p != NULL, ("%s: null in6p" , __func__)); |
| 1707 | |
| 1708 | if (in6p->in6p_sp == NULL) |
| 1709 | return 0; |
| 1710 | |
| 1711 | if (in6p->in6p_sp->sp_in != NULL) |
| 1712 | KEY_FREESP(&in6p->in6p_sp->sp_in); |
| 1713 | |
| 1714 | if (in6p->in6p_sp->sp_out != NULL) |
| 1715 | KEY_FREESP(&in6p->in6p_sp->sp_out); |
| 1716 | |
| 1717 | #ifdef __NetBSD |
| 1718 | ipsec_invalpcbcache(in6p->in6p_sp, IPSEC_DIR_ANY); |
| 1719 | #endif |
| 1720 | |
| 1721 | ipsec_delpcbpolicy(in6p->in6p_sp); |
| 1722 | in6p->in6p_sp = NULL; |
| 1723 | |
| 1724 | return 0; |
| 1725 | } |
| 1726 | #endif |
| 1727 | |
| 1728 | /* |
| 1729 | * return current level. |
| 1730 | * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. |
| 1731 | */ |
| 1732 | u_int |
| 1733 | ipsec_get_reqlevel(const struct ipsecrequest *isr) |
| 1734 | { |
| 1735 | u_int level = 0; |
| 1736 | u_int esp_trans_deflev, esp_net_deflev; |
| 1737 | u_int ah_trans_deflev, ah_net_deflev; |
| 1738 | |
| 1739 | IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("%s: null argument" , |
| 1740 | __func__)); |
| 1741 | IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == |
| 1742 | isr->sp->spidx.dst.sa.sa_family, |
| 1743 | ("%s: af family mismatch, src %u, dst %u" , __func__, |
| 1744 | isr->sp->spidx.src.sa.sa_family, isr->sp->spidx.dst.sa.sa_family)); |
| 1745 | |
| 1746 | /* XXX note that we have ipseclog() expanded here - code sync issue */ |
| 1747 | #define IPSEC_CHECK_DEFAULT(lev) \ |
| 1748 | (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ |
| 1749 | && (lev) != IPSEC_LEVEL_UNIQUE) ? \ |
| 1750 | (ipsec_debug ? log(LOG_INFO, "fixed system default level " #lev \ |
| 1751 | ":%d->%d\n", (lev), IPSEC_LEVEL_REQUIRE) : (void)0), \ |
| 1752 | (lev) = IPSEC_LEVEL_REQUIRE, (lev) \ |
| 1753 | : (lev)) |
| 1754 | |
| 1755 | /* set default level */ |
| 1756 | switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { |
| 1757 | #ifdef INET |
| 1758 | case AF_INET: |
| 1759 | esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); |
| 1760 | esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); |
| 1761 | ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); |
| 1762 | ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); |
| 1763 | break; |
| 1764 | #endif |
| 1765 | #ifdef INET6 |
| 1766 | case AF_INET6: |
| 1767 | esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); |
| 1768 | esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); |
| 1769 | ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); |
| 1770 | ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); |
| 1771 | break; |
| 1772 | #endif /* INET6 */ |
| 1773 | default: |
| 1774 | panic("%s: unknown af %u" , __func__, |
| 1775 | isr->sp->spidx.src.sa.sa_family); |
| 1776 | } |
| 1777 | |
| 1778 | #undef IPSEC_CHECK_DEFAULT |
| 1779 | |
| 1780 | /* set level */ |
| 1781 | switch (isr->level) { |
| 1782 | case IPSEC_LEVEL_DEFAULT: |
| 1783 | switch (isr->saidx.proto) { |
| 1784 | case IPPROTO_ESP: |
| 1785 | if (isr->saidx.mode == IPSEC_MODE_TUNNEL) |
| 1786 | level = esp_net_deflev; |
| 1787 | else |
| 1788 | level = esp_trans_deflev; |
| 1789 | break; |
| 1790 | case IPPROTO_AH: |
| 1791 | if (isr->saidx.mode == IPSEC_MODE_TUNNEL) |
| 1792 | level = ah_net_deflev; |
| 1793 | else |
| 1794 | level = ah_trans_deflev; |
| 1795 | break; |
| 1796 | case IPPROTO_IPCOMP: |
| 1797 | /* |
| 1798 | * we don't really care, as IPcomp document says that |
| 1799 | * we shouldn't compress small packets |
| 1800 | */ |
| 1801 | level = IPSEC_LEVEL_USE; |
| 1802 | break; |
| 1803 | default: |
| 1804 | panic("%s: Illegal protocol defined %u" , __func__, |
| 1805 | isr->saidx.proto); |
| 1806 | } |
| 1807 | break; |
| 1808 | |
| 1809 | case IPSEC_LEVEL_USE: |
| 1810 | case IPSEC_LEVEL_REQUIRE: |
| 1811 | level = isr->level; |
| 1812 | break; |
| 1813 | case IPSEC_LEVEL_UNIQUE: |
| 1814 | level = IPSEC_LEVEL_REQUIRE; |
| 1815 | break; |
| 1816 | |
| 1817 | default: |
| 1818 | panic("%s: Illegal IPsec level %u" , __func__, isr->level); |
| 1819 | } |
| 1820 | |
| 1821 | return level; |
| 1822 | } |
| 1823 | |
| 1824 | /* |
| 1825 | * Check security policy requirements against the actual |
| 1826 | * packet contents. Return one if the packet should be |
| 1827 | * reject as "invalid"; otherwiser return zero to have the |
| 1828 | * packet treated as "valid". |
| 1829 | * |
| 1830 | * OUT: |
| 1831 | * 0: valid |
| 1832 | * 1: invalid |
| 1833 | */ |
| 1834 | int |
| 1835 | ipsec_in_reject(const struct secpolicy *sp, const struct mbuf *m) |
| 1836 | { |
| 1837 | struct ipsecrequest *isr; |
| 1838 | int need_auth; |
| 1839 | |
| 1840 | KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("%s: using SP\n" , __func__); |
| 1841 | kdebug_secpolicy(sp)); |
| 1842 | |
| 1843 | /* check policy */ |
| 1844 | switch (sp->policy) { |
| 1845 | case IPSEC_POLICY_DISCARD: |
| 1846 | return 1; |
| 1847 | case IPSEC_POLICY_BYPASS: |
| 1848 | case IPSEC_POLICY_NONE: |
| 1849 | return 0; |
| 1850 | } |
| 1851 | |
| 1852 | IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, |
| 1853 | ("%s: invalid policy %u" , __func__, sp->policy)); |
| 1854 | |
| 1855 | /* XXX should compare policy against ipsec header history */ |
| 1856 | |
| 1857 | need_auth = 0; |
| 1858 | for (isr = sp->req; isr != NULL; isr = isr->next) { |
| 1859 | if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) |
| 1860 | continue; |
| 1861 | switch (isr->saidx.proto) { |
| 1862 | case IPPROTO_ESP: |
| 1863 | if ((m->m_flags & M_DECRYPTED) == 0) { |
| 1864 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, |
| 1865 | printf("%s: ESP m_flags:%x\n" , __func__, |
| 1866 | m->m_flags)); |
| 1867 | return 1; |
| 1868 | } |
| 1869 | |
| 1870 | if (!need_auth && |
| 1871 | isr->sav != NULL && |
| 1872 | isr->sav->tdb_authalgxform != NULL && |
| 1873 | (m->m_flags & M_AUTHIPDGM) == 0) { |
| 1874 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, |
| 1875 | printf("%s: ESP/AH m_flags:%x\n" , __func__, |
| 1876 | m->m_flags)); |
| 1877 | return 1; |
| 1878 | } |
| 1879 | break; |
| 1880 | case IPPROTO_AH: |
| 1881 | need_auth = 1; |
| 1882 | if ((m->m_flags & M_AUTHIPHDR) == 0) { |
| 1883 | KEYDEBUG(KEYDEBUG_IPSEC_DUMP, |
| 1884 | printf("%s: AH m_flags:%x\n" , __func__, |
| 1885 | m->m_flags)); |
| 1886 | return 1; |
| 1887 | } |
| 1888 | break; |
| 1889 | case IPPROTO_IPCOMP: |
| 1890 | /* |
| 1891 | * we don't really care, as IPcomp document |
| 1892 | * says that we shouldn't compress small |
| 1893 | * packets, IPComp policy should always be |
| 1894 | * treated as being in "use" level. |
| 1895 | */ |
| 1896 | break; |
| 1897 | } |
| 1898 | } |
| 1899 | return 0; /* valid */ |
| 1900 | } |
| 1901 | |
| 1902 | /* |
| 1903 | * Check AH/ESP integrity. |
| 1904 | * This function is called from tcp_input(), udp_input(), |
| 1905 | * and {ah,esp}4_input for tunnel mode |
| 1906 | */ |
| 1907 | int |
| 1908 | ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) |
| 1909 | { |
| 1910 | struct secpolicy *sp; |
| 1911 | int error; |
| 1912 | int result; |
| 1913 | |
| 1914 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 1915 | |
| 1916 | /* get SP for this packet. |
| 1917 | * When we are called from ip_forward(), we call |
| 1918 | * ipsec_getpolicybyaddr() with IP_FORWARDING flag. |
| 1919 | */ |
| 1920 | if (inp == NULL) |
| 1921 | sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); |
| 1922 | else |
| 1923 | sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, |
| 1924 | IN4PCB_TO_PCB(inp), &error); |
| 1925 | |
| 1926 | if (sp != NULL) { |
| 1927 | result = ipsec_in_reject(sp, m); |
| 1928 | if (result) |
| 1929 | IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); |
| 1930 | KEY_FREESP(&sp); |
| 1931 | } else { |
| 1932 | result = 0; /* XXX should be panic ? |
| 1933 | * -> No, there may be error. */ |
| 1934 | } |
| 1935 | return result; |
| 1936 | } |
| 1937 | |
| 1938 | |
| 1939 | #ifdef INET6 |
| 1940 | /* |
| 1941 | * Check AH/ESP integrity. |
| 1942 | * This function is called from tcp6_input(), udp6_input(), |
| 1943 | * and {ah,esp}6_input for tunnel mode |
| 1944 | */ |
| 1945 | int |
| 1946 | ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p) |
| 1947 | { |
| 1948 | struct secpolicy *sp = NULL; |
| 1949 | int error; |
| 1950 | int result; |
| 1951 | |
| 1952 | /* sanity check */ |
| 1953 | if (m == NULL) |
| 1954 | return 0; /* XXX should be panic ? */ |
| 1955 | |
| 1956 | /* get SP for this packet. |
| 1957 | * When we are called from ip_forward(), we call |
| 1958 | * ipsec_getpolicybyaddr() with IP_FORWARDING flag. |
| 1959 | */ |
| 1960 | if (in6p == NULL) |
| 1961 | sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); |
| 1962 | else |
| 1963 | sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, |
| 1964 | IN6PCB_TO_PCB(in6p), |
| 1965 | &error); |
| 1966 | |
| 1967 | if (sp != NULL) { |
| 1968 | result = ipsec_in_reject(sp, m); |
| 1969 | if (result) |
| 1970 | IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); |
| 1971 | KEY_FREESP(&sp); |
| 1972 | } else { |
| 1973 | result = 0; |
| 1974 | } |
| 1975 | return result; |
| 1976 | } |
| 1977 | #endif |
| 1978 | |
| 1979 | /* |
| 1980 | * compute the byte size to be occupied by IPsec header. |
| 1981 | * in case it is tunneled, it includes the size of outer IP header. |
| 1982 | * NOTE: SP passed is free in this function. |
| 1983 | */ |
| 1984 | static size_t |
| 1985 | ipsec_hdrsiz(const struct secpolicy *sp) |
| 1986 | { |
| 1987 | const struct ipsecrequest *isr; |
| 1988 | size_t siz; |
| 1989 | |
| 1990 | KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("%s: using SP\n" , __func__); |
| 1991 | kdebug_secpolicy(sp)); |
| 1992 | |
| 1993 | switch (sp->policy) { |
| 1994 | case IPSEC_POLICY_DISCARD: |
| 1995 | case IPSEC_POLICY_BYPASS: |
| 1996 | case IPSEC_POLICY_NONE: |
| 1997 | return 0; |
| 1998 | } |
| 1999 | |
| 2000 | IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, |
| 2001 | ("%s: invalid policy %u" , __func__, sp->policy)); |
| 2002 | |
| 2003 | siz = 0; |
| 2004 | for (isr = sp->req; isr != NULL; isr = isr->next) { |
| 2005 | size_t clen = 0; |
| 2006 | |
| 2007 | switch (isr->saidx.proto) { |
| 2008 | case IPPROTO_ESP: |
| 2009 | clen = esp_hdrsiz(isr->sav); |
| 2010 | break; |
| 2011 | case IPPROTO_AH: |
| 2012 | clen = ah_hdrsiz(isr->sav); |
| 2013 | break; |
| 2014 | case IPPROTO_IPCOMP: |
| 2015 | clen = sizeof(struct ipcomp); |
| 2016 | break; |
| 2017 | } |
| 2018 | |
| 2019 | if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { |
| 2020 | switch (isr->saidx.dst.sa.sa_family) { |
| 2021 | case AF_INET: |
| 2022 | clen += sizeof(struct ip); |
| 2023 | break; |
| 2024 | #ifdef INET6 |
| 2025 | case AF_INET6: |
| 2026 | clen += sizeof(struct ip6_hdr); |
| 2027 | break; |
| 2028 | #endif |
| 2029 | default: |
| 2030 | ipseclog((LOG_ERR, "%s: unknown AF %d in " |
| 2031 | "IPsec tunnel SA\n" , __func__, |
| 2032 | ((const struct sockaddr *)&isr->saidx.dst) |
| 2033 | ->sa_family)); |
| 2034 | break; |
| 2035 | } |
| 2036 | } |
| 2037 | siz += clen; |
| 2038 | } |
| 2039 | |
| 2040 | return siz; |
| 2041 | } |
| 2042 | |
| 2043 | /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ |
| 2044 | size_t |
| 2045 | ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) |
| 2046 | { |
| 2047 | struct secpolicy *sp; |
| 2048 | int error; |
| 2049 | size_t size; |
| 2050 | |
| 2051 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 2052 | IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, |
| 2053 | ("%s: socket w/o inpcb" , __func__)); |
| 2054 | |
| 2055 | /* get SP for this packet. |
| 2056 | * When we are called from ip_forward(), we call |
| 2057 | * ipsec_getpolicybyaddr() with IP_FORWARDING flag. |
| 2058 | */ |
| 2059 | if (inp == NULL) |
| 2060 | sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); |
| 2061 | else |
| 2062 | sp = ipsec_getpolicybysock(m, dir, |
| 2063 | IN4PCB_TO_PCB(inp), &error); |
| 2064 | |
| 2065 | if (sp != NULL) { |
| 2066 | size = ipsec_hdrsiz(sp); |
| 2067 | KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("%s: size:%lu.\n" , |
| 2068 | __func__, (unsigned long)size)); |
| 2069 | |
| 2070 | KEY_FREESP(&sp); |
| 2071 | } else { |
| 2072 | size = 0; /* XXX should be panic ? */ |
| 2073 | } |
| 2074 | return size; |
| 2075 | } |
| 2076 | |
| 2077 | #ifdef INET6 |
| 2078 | /* This function is called from ipsec6_hdrsize_tcp(), |
| 2079 | * and maybe from ip6_forward.() |
| 2080 | */ |
| 2081 | size_t |
| 2082 | ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p) |
| 2083 | { |
| 2084 | struct secpolicy *sp; |
| 2085 | int error; |
| 2086 | size_t size; |
| 2087 | |
| 2088 | IPSEC_ASSERT(m != NULL, ("%s: null mbuf" , __func__)); |
| 2089 | IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, |
| 2090 | ("%s: socket w/o inpcb" , __func__)); |
| 2091 | |
| 2092 | /* get SP for this packet */ |
| 2093 | /* XXX Is it right to call with IP_FORWARDING. */ |
| 2094 | if (in6p == NULL) |
| 2095 | sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); |
| 2096 | else |
| 2097 | sp = ipsec_getpolicybysock(m, dir, |
| 2098 | IN6PCB_TO_PCB(in6p), |
| 2099 | &error); |
| 2100 | |
| 2101 | if (sp == NULL) |
| 2102 | return 0; |
| 2103 | size = ipsec_hdrsiz(sp); |
| 2104 | KEYDEBUG(KEYDEBUG_IPSEC_DATA, |
| 2105 | printf("%s: size:%zu.\n" , __func__, size)); |
| 2106 | KEY_FREESP(&sp); |
| 2107 | |
| 2108 | return size; |
| 2109 | } |
| 2110 | #endif /*INET6*/ |
| 2111 | |
| 2112 | /* |
| 2113 | * Check the variable replay window. |
| 2114 | * ipsec_chkreplay() performs replay check before ICV verification. |
| 2115 | * ipsec_updatereplay() updates replay bitmap. This must be called after |
| 2116 | * ICV verification (it also performs replay check, which is usually done |
| 2117 | * beforehand). |
| 2118 | * 0 (zero) is returned if packet disallowed, 1 if packet permitted. |
| 2119 | * |
| 2120 | * based on RFC 2401. |
| 2121 | */ |
| 2122 | int |
| 2123 | ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) |
| 2124 | { |
| 2125 | const struct secreplay *replay; |
| 2126 | u_int32_t diff; |
| 2127 | int fr; |
| 2128 | u_int32_t wsizeb; /* constant: bits of window size */ |
| 2129 | int frlast; /* constant: last frame */ |
| 2130 | |
| 2131 | IPSEC_SPLASSERT_SOFTNET(__func__); |
| 2132 | |
| 2133 | IPSEC_ASSERT(sav != NULL, ("%s: Null SA" , __func__)); |
| 2134 | IPSEC_ASSERT(sav->replay != NULL, ("%s: Null replay state" , __func__)); |
| 2135 | |
| 2136 | replay = sav->replay; |
| 2137 | |
| 2138 | if (replay->wsize == 0) |
| 2139 | return 1; /* no need to check replay. */ |
| 2140 | |
| 2141 | /* constant */ |
| 2142 | frlast = replay->wsize - 1; |
| 2143 | wsizeb = replay->wsize << 3; |
| 2144 | |
| 2145 | /* sequence number of 0 is invalid */ |
| 2146 | if (seq == 0) |
| 2147 | return 0; |
| 2148 | |
| 2149 | /* first time is always okay */ |
| 2150 | if (replay->count == 0) |
| 2151 | return 1; |
| 2152 | |
| 2153 | if (seq > replay->lastseq) { |
| 2154 | /* larger sequences are okay */ |
| 2155 | return 1; |
| 2156 | } else { |
| 2157 | /* seq is equal or less than lastseq. */ |
| 2158 | diff = replay->lastseq - seq; |
| 2159 | |
| 2160 | /* over range to check, i.e. too old or wrapped */ |
| 2161 | if (diff >= wsizeb) |
| 2162 | return 0; |
| 2163 | |
| 2164 | fr = frlast - diff / 8; |
| 2165 | |
| 2166 | /* this packet already seen ? */ |
| 2167 | if ((replay->bitmap)[fr] & (1 << (diff % 8))) |
| 2168 | return 0; |
| 2169 | |
| 2170 | /* out of order but good */ |
| 2171 | return 1; |
| 2172 | } |
| 2173 | } |
| 2174 | |
| 2175 | /* |
| 2176 | * check replay counter whether to update or not. |
| 2177 | * OUT: 0: OK |
| 2178 | * 1: NG |
| 2179 | */ |
| 2180 | int |
| 2181 | ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) |
| 2182 | { |
| 2183 | struct secreplay *replay; |
| 2184 | u_int32_t diff; |
| 2185 | int fr; |
| 2186 | u_int32_t wsizeb; /* constant: bits of window size */ |
| 2187 | int frlast; /* constant: last frame */ |
| 2188 | |
| 2189 | IPSEC_SPLASSERT_SOFTNET(__func__); |
| 2190 | |
| 2191 | IPSEC_ASSERT(sav != NULL, ("%s: Null SA" , __func__)); |
| 2192 | IPSEC_ASSERT(sav->replay != NULL, ("%s: Null replay state" , __func__)); |
| 2193 | |
| 2194 | replay = sav->replay; |
| 2195 | |
| 2196 | if (replay->wsize == 0) |
| 2197 | goto ok; /* no need to check replay. */ |
| 2198 | |
| 2199 | /* constant */ |
| 2200 | frlast = replay->wsize - 1; |
| 2201 | wsizeb = replay->wsize << 3; |
| 2202 | |
| 2203 | /* sequence number of 0 is invalid */ |
| 2204 | if (seq == 0) |
| 2205 | return 1; |
| 2206 | |
| 2207 | /* first time */ |
| 2208 | if (replay->count == 0) { |
| 2209 | replay->lastseq = seq; |
| 2210 | memset(replay->bitmap, 0, replay->wsize); |
| 2211 | (replay->bitmap)[frlast] = 1; |
| 2212 | goto ok; |
| 2213 | } |
| 2214 | |
| 2215 | if (seq > replay->lastseq) { |
| 2216 | /* seq is larger than lastseq. */ |
| 2217 | diff = seq - replay->lastseq; |
| 2218 | |
| 2219 | /* new larger sequence number */ |
| 2220 | if (diff < wsizeb) { |
| 2221 | /* In window */ |
| 2222 | /* set bit for this packet */ |
| 2223 | vshiftl(replay->bitmap, diff, replay->wsize); |
| 2224 | (replay->bitmap)[frlast] |= 1; |
| 2225 | } else { |
| 2226 | /* this packet has a "way larger" */ |
| 2227 | memset(replay->bitmap, 0, replay->wsize); |
| 2228 | (replay->bitmap)[frlast] = 1; |
| 2229 | } |
| 2230 | replay->lastseq = seq; |
| 2231 | |
| 2232 | /* larger is good */ |
| 2233 | } else { |
| 2234 | /* seq is equal or less than lastseq. */ |
| 2235 | diff = replay->lastseq - seq; |
| 2236 | |
| 2237 | /* over range to check, i.e. too old or wrapped */ |
| 2238 | if (diff >= wsizeb) |
| 2239 | return 1; |
| 2240 | |
| 2241 | fr = frlast - diff / 8; |
| 2242 | |
| 2243 | /* this packet already seen ? */ |
| 2244 | if ((replay->bitmap)[fr] & (1 << (diff % 8))) |
| 2245 | return 1; |
| 2246 | |
| 2247 | /* mark as seen */ |
| 2248 | (replay->bitmap)[fr] |= (1 << (diff % 8)); |
| 2249 | |
| 2250 | /* out of order but good */ |
| 2251 | } |
| 2252 | |
| 2253 | ok: |
| 2254 | if (replay->count == ~0) { |
| 2255 | |
| 2256 | /* set overflow flag */ |
| 2257 | replay->overflow++; |
| 2258 | |
| 2259 | /* don't increment, no more packets accepted */ |
| 2260 | if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) |
| 2261 | return 1; |
| 2262 | |
| 2263 | ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n" , |
| 2264 | replay->overflow, ipsec_logsastr(sav))); |
| 2265 | } |
| 2266 | |
| 2267 | replay->count++; |
| 2268 | |
| 2269 | return 0; |
| 2270 | } |
| 2271 | |
| 2272 | /* |
| 2273 | * shift variable length bunffer to left. |
| 2274 | * IN: bitmap: pointer to the buffer |
| 2275 | * nbit: the number of to shift. |
| 2276 | * wsize: buffer size (bytes). |
| 2277 | */ |
| 2278 | static void |
| 2279 | vshiftl(unsigned char *bitmap, int nbit, int wsize) |
| 2280 | { |
| 2281 | int s, j, i; |
| 2282 | unsigned char over; |
| 2283 | |
| 2284 | for (j = 0; j < nbit; j += 8) { |
| 2285 | s = (nbit - j < 8) ? (nbit - j): 8; |
| 2286 | bitmap[0] <<= s; |
| 2287 | for (i = 1; i < wsize; i++) { |
| 2288 | over = (bitmap[i] >> (8 - s)); |
| 2289 | bitmap[i] <<= s; |
| 2290 | bitmap[i-1] |= over; |
| 2291 | } |
| 2292 | } |
| 2293 | |
| 2294 | return; |
| 2295 | } |
| 2296 | |
| 2297 | /* Return a printable string for the IPv4 address. */ |
| 2298 | static char * |
| 2299 | inet_ntoa4(struct in_addr ina) |
| 2300 | { |
| 2301 | static char buf[4][4 * sizeof "123" + 4]; |
| 2302 | unsigned char *ucp = (unsigned char *) &ina; |
| 2303 | static int i = 3; |
| 2304 | |
| 2305 | i = (i + 1) % 4; |
| 2306 | snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d" , |
| 2307 | ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); |
| 2308 | return (buf[i]); |
| 2309 | } |
| 2310 | |
| 2311 | /* Return a printable string for the address. */ |
| 2312 | const char * |
| 2313 | ipsec_address(const union sockaddr_union *sa) |
| 2314 | { |
| 2315 | switch (sa->sa.sa_family) { |
| 2316 | #if INET |
| 2317 | case AF_INET: |
| 2318 | return inet_ntoa4(sa->sin.sin_addr); |
| 2319 | #endif /* INET */ |
| 2320 | |
| 2321 | #if INET6 |
| 2322 | case AF_INET6: |
| 2323 | return ip6_sprintf(&sa->sin6.sin6_addr); |
| 2324 | #endif /* INET6 */ |
| 2325 | |
| 2326 | default: |
| 2327 | return "(unknown address family)" ; |
| 2328 | } |
| 2329 | } |
| 2330 | |
| 2331 | const char * |
| 2332 | ipsec_logsastr(const struct secasvar *sav) |
| 2333 | { |
| 2334 | static char buf[256]; |
| 2335 | char *p; |
| 2336 | const struct secasindex *saidx = &sav->sah->saidx; |
| 2337 | |
| 2338 | IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, |
| 2339 | ("%s: address family mismatch" , __func__)); |
| 2340 | |
| 2341 | p = buf; |
| 2342 | snprintf(buf, sizeof(buf), "SA(SPI=%u " , (u_int32_t)ntohl(sav->spi)); |
| 2343 | while (p && *p) |
| 2344 | p++; |
| 2345 | /* NB: only use ipsec_address on one address at a time */ |
| 2346 | snprintf(p, sizeof (buf) - (p - buf), "src=%s " , |
| 2347 | ipsec_address(&saidx->src)); |
| 2348 | while (p && *p) |
| 2349 | p++; |
| 2350 | snprintf(p, sizeof (buf) - (p - buf), "dst=%s)" , |
| 2351 | ipsec_address(&saidx->dst)); |
| 2352 | |
| 2353 | return buf; |
| 2354 | } |
| 2355 | |
| 2356 | void |
| 2357 | ipsec_dumpmbuf(struct mbuf *m) |
| 2358 | { |
| 2359 | int totlen; |
| 2360 | int i; |
| 2361 | u_char *p; |
| 2362 | |
| 2363 | totlen = 0; |
| 2364 | printf("---\n" ); |
| 2365 | while (m) { |
| 2366 | p = mtod(m, u_char *); |
| 2367 | for (i = 0; i < m->m_len; i++) { |
| 2368 | printf("%02x " , p[i]); |
| 2369 | totlen++; |
| 2370 | if (totlen % 16 == 0) |
| 2371 | printf("\n" ); |
| 2372 | } |
| 2373 | m = m->m_next; |
| 2374 | } |
| 2375 | if (totlen % 16 != 0) |
| 2376 | printf("\n" ); |
| 2377 | printf("---\n" ); |
| 2378 | } |
| 2379 | |
| 2380 | #ifdef INET6 |
| 2381 | struct secpolicy * |
| 2382 | ipsec6_check_policy(struct mbuf *m, const struct socket *so, |
| 2383 | int flags, int *needipsecp, int *errorp) |
| 2384 | { |
| 2385 | struct in6pcb *in6p = NULL; |
| 2386 | struct secpolicy *sp = NULL; |
| 2387 | int s; |
| 2388 | int error = 0; |
| 2389 | int needipsec = 0; |
| 2390 | |
| 2391 | if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) |
| 2392 | in6p = sotoin6pcb(so); |
| 2393 | |
| 2394 | if (!ipsec_outdone(m)) { |
| 2395 | s = splsoftnet(); |
| 2396 | if (in6p != NULL && |
| 2397 | IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { |
| 2398 | splx(s); |
| 2399 | goto skippolicycheck; |
| 2400 | } |
| 2401 | sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); |
| 2402 | |
| 2403 | /* |
| 2404 | * There are four return cases: |
| 2405 | * sp != NULL apply IPsec policy |
| 2406 | * sp == NULL, error == 0 no IPsec handling needed |
| 2407 | * sp == NULL, error == -EINVAL discard packet w/o error |
| 2408 | * sp == NULL, error != 0 discard packet, report error |
| 2409 | */ |
| 2410 | |
| 2411 | splx(s); |
| 2412 | if (sp == NULL) { |
| 2413 | /* |
| 2414 | * Caller must check the error return to see if it needs to discard |
| 2415 | * the packet. |
| 2416 | */ |
| 2417 | needipsec = 0; |
| 2418 | } else { |
| 2419 | needipsec = 1; |
| 2420 | } |
| 2421 | } |
| 2422 | skippolicycheck:; |
| 2423 | |
| 2424 | *errorp = error; |
| 2425 | *needipsecp = needipsec; |
| 2426 | return sp; |
| 2427 | } |
| 2428 | |
| 2429 | int |
| 2430 | ipsec6_input(struct mbuf *m) |
| 2431 | { |
| 2432 | struct m_tag *mtag; |
| 2433 | struct tdb_ident *tdbi; |
| 2434 | struct secpolicy *sp; |
| 2435 | int s, error; |
| 2436 | |
| 2437 | /* |
| 2438 | * Check if the packet has already had IPsec |
| 2439 | * processing done. If so, then just pass it |
| 2440 | * along. This tag gets set during AH, ESP, |
| 2441 | * etc. input handling, before the packet is |
| 2442 | * returned to the ip input queue for delivery. |
| 2443 | */ |
| 2444 | mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, |
| 2445 | NULL); |
| 2446 | s = splsoftnet(); |
| 2447 | if (mtag != NULL) { |
| 2448 | tdbi = (struct tdb_ident *)(mtag + 1); |
| 2449 | sp = ipsec_getpolicy(tdbi, |
| 2450 | IPSEC_DIR_INBOUND); |
| 2451 | } else { |
| 2452 | sp = ipsec_getpolicybyaddr(m, |
| 2453 | IPSEC_DIR_INBOUND, IP_FORWARDING, |
| 2454 | &error); |
| 2455 | } |
| 2456 | if (sp != NULL) { |
| 2457 | /* |
| 2458 | * Check security policy against packet |
| 2459 | * attributes. |
| 2460 | */ |
| 2461 | error = ipsec_in_reject(sp, m); |
| 2462 | KEY_FREESP(&sp); |
| 2463 | } else { |
| 2464 | /* XXX error stat??? */ |
| 2465 | error = EINVAL; |
| 2466 | DPRINTF(("ip6_input: no SP, packet" |
| 2467 | " discarded\n" ));/*XXX*/ |
| 2468 | } |
| 2469 | splx(s); |
| 2470 | |
| 2471 | return error; |
| 2472 | } |
| 2473 | #endif /* INET6 */ |
| 2474 | |
| 2475 | |
| 2476 | |
| 2477 | /* XXX this stuff doesn't belong here... */ |
| 2478 | |
| 2479 | static struct xformsw *xforms = NULL; |
| 2480 | |
| 2481 | /* |
| 2482 | * Register a transform; typically at system startup. |
| 2483 | */ |
| 2484 | void |
| 2485 | xform_register(struct xformsw *xsp) |
| 2486 | { |
| 2487 | xsp->xf_next = xforms; |
| 2488 | xforms = xsp; |
| 2489 | } |
| 2490 | |
| 2491 | /* |
| 2492 | * Initialize transform support in an sav. |
| 2493 | */ |
| 2494 | int |
| 2495 | xform_init(struct secasvar *sav, int xftype) |
| 2496 | { |
| 2497 | struct xformsw *xsp; |
| 2498 | |
| 2499 | if (sav->tdb_xform != NULL) /* previously initialized */ |
| 2500 | return 0; |
| 2501 | for (xsp = xforms; xsp; xsp = xsp->xf_next) |
| 2502 | if (xsp->xf_type == xftype) |
| 2503 | return (*xsp->xf_init)(sav, xsp); |
| 2504 | |
| 2505 | DPRINTF(("%s: no match for xform type %d\n" , __func__, xftype)); |
| 2506 | return EINVAL; |
| 2507 | } |
| 2508 | |
| 2509 | void |
| 2510 | nat_t_ports_get(struct mbuf *m, u_int16_t *dport, u_int16_t *sport) { |
| 2511 | struct m_tag *tag; |
| 2512 | |
| 2513 | if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) { |
| 2514 | *sport = ((u_int16_t *)(tag + 1))[0]; |
| 2515 | *dport = ((u_int16_t *)(tag + 1))[1]; |
| 2516 | } else |
| 2517 | *sport = *dport = 0; |
| 2518 | } |
| 2519 | |
| 2520 | #ifdef __NetBSD__ |
| 2521 | /* |
| 2522 | * XXXJRT This should be done as a protosw init call. |
| 2523 | */ |
| 2524 | void |
| 2525 | ipsec_attach(void) |
| 2526 | { |
| 2527 | |
| 2528 | ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); |
| 2529 | |
| 2530 | ah_attach(); |
| 2531 | esp_attach(); |
| 2532 | ipcomp_attach(); |
| 2533 | ipe4_attach(); |
| 2534 | #ifdef TCP_SIGNATURE |
| 2535 | tcpsignature_attach(); |
| 2536 | #endif |
| 2537 | } |
| 2538 | #endif /* __NetBSD__ */ |
| 2539 | |