1 /* $FreeBSD$ */ 2 /* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * IPsec controller part. 35 */ 36 37 #ifndef _NETIPSEC_IPSEC_H_ 38 #define _NETIPSEC_IPSEC_H_ 39 40 #if defined(_KERNEL) && !defined(_LKM) && !defined(KLD_MODULE) 41 #include "opt_inet.h" 42 #include "opt_ipsec.h" 43 #endif 44 45 #include <net/pfkeyv2.h> 46 #include <netipsec/keydb.h> 47 48 #ifdef _KERNEL 49 50 #define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m) 51 52 #define IPSEC_IS_PRIVILEGED_SO(_so) \ 53 ((_so)->so_cred != NULL && \ 54 priv_check_cred((_so)->so_cred, PRIV_NETINET_IPSEC, 0) \ 55 == 0) 56 57 /* 58 * Security Policy Index 59 * Ensure that both address families in the "src" and "dst" are same. 60 * When the value of the ul_proto is ICMPv6, the port field in "src" 61 * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code. 62 */ 63 struct secpolicyindex { 64 u_int8_t dir; /* direction of packet flow, see blow */ 65 union sockaddr_union src; /* IP src address for SP */ 66 union sockaddr_union dst; /* IP dst address for SP */ 67 u_int8_t prefs; /* prefix length in bits for src */ 68 u_int8_t prefd; /* prefix length in bits for dst */ 69 u_int16_t ul_proto; /* upper layer Protocol */ 70 #ifdef notyet 71 uid_t uids; 72 uid_t uidd; 73 gid_t gids; 74 gid_t gidd; 75 #endif 76 }; 77 78 /* Security Policy Data Base */ 79 struct secpolicy { 80 LIST_ENTRY(secpolicy) chain; 81 struct mtx lock; 82 83 u_int refcnt; /* reference count */ 84 struct secpolicyindex spidx; /* selector */ 85 u_int32_t id; /* It's unique number on the system. */ 86 u_int state; /* 0: dead, others: alive */ 87 #define IPSEC_SPSTATE_DEAD 0 88 #define IPSEC_SPSTATE_ALIVE 1 89 u_int16_t policy; /* policy_type per pfkeyv2.h */ 90 u_int16_t scangen; /* scan generation # */ 91 struct ipsecrequest *req; 92 /* pointer to the ipsec request tree, */ 93 /* if policy == IPSEC else this value == NULL.*/ 94 95 /* 96 * lifetime handler. 97 * the policy can be used without limitiation if both lifetime and 98 * validtime are zero. 99 * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime. 100 * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime. 101 */ 102 time_t created; /* time created the policy */ 103 time_t lastused; /* updated every when kernel sends a packet */ 104 long lifetime; /* duration of the lifetime of this policy */ 105 long validtime; /* duration this policy is valid without use */ 106 }; 107 108 #define SECPOLICY_LOCK_INIT(_sp) \ 109 mtx_init(&(_sp)->lock, "ipsec policy", NULL, MTX_DEF) 110 #define SECPOLICY_LOCK(_sp) mtx_lock(&(_sp)->lock) 111 #define SECPOLICY_UNLOCK(_sp) mtx_unlock(&(_sp)->lock) 112 #define SECPOLICY_LOCK_DESTROY(_sp) mtx_destroy(&(_sp)->lock) 113 #define SECPOLICY_LOCK_ASSERT(_sp) mtx_assert(&(_sp)->lock, MA_OWNED) 114 115 /* Request for IPsec */ 116 struct ipsecrequest { 117 struct ipsecrequest *next; 118 /* pointer to next structure */ 119 /* If NULL, it means the end of chain. */ 120 struct secasindex saidx;/* hint for search proper SA */ 121 /* if __ss_len == 0 then no address specified.*/ 122 u_int level; /* IPsec level defined below. */ 123 124 struct secasvar *sav; /* place holder of SA for use */ 125 struct secpolicy *sp; /* back pointer to SP */ 126 struct mtx lock; /* to interlock updates */ 127 }; 128 129 /* 130 * Need recursion for when crypto callbacks happen directly, 131 * as in the case of software crypto. Need to look at how 132 * hard it is to remove this... 133 */ 134 #define IPSECREQUEST_LOCK_INIT(_isr) \ 135 mtx_init(&(_isr)->lock, "ipsec request", NULL, MTX_DEF | MTX_RECURSE) 136 #define IPSECREQUEST_LOCK(_isr) mtx_lock(&(_isr)->lock) 137 #define IPSECREQUEST_UNLOCK(_isr) mtx_unlock(&(_isr)->lock) 138 #define IPSECREQUEST_LOCK_DESTROY(_isr) mtx_destroy(&(_isr)->lock) 139 #define IPSECREQUEST_LOCK_ASSERT(_isr) mtx_assert(&(_isr)->lock, MA_OWNED) 140 141 /* security policy in PCB */ 142 struct inpcbpolicy { 143 struct secpolicy *sp_in; 144 struct secpolicy *sp_out; 145 int priv; /* privileged socket ? */ 146 }; 147 148 /* SP acquiring list table. */ 149 struct secspacq { 150 LIST_ENTRY(secspacq) chain; 151 152 struct secpolicyindex spidx; 153 154 time_t created; /* for lifetime */ 155 int count; /* for lifetime */ 156 /* XXX: here is mbuf place holder to be sent ? */ 157 }; 158 #endif /* _KERNEL */ 159 160 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 161 #define IPSEC_PORT_ANY 0 162 #define IPSEC_ULPROTO_ANY 255 163 #define IPSEC_PROTO_ANY 255 164 165 /* mode of security protocol */ 166 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 167 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 168 #define IPSEC_MODE_TRANSPORT 1 169 #define IPSEC_MODE_TUNNEL 2 170 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 171 172 /* 173 * Direction of security policy. 174 * NOTE: Since INVALID is used just as flag. 175 * The other are used for loop counter too. 176 */ 177 #define IPSEC_DIR_ANY 0 178 #define IPSEC_DIR_INBOUND 1 179 #define IPSEC_DIR_OUTBOUND 2 180 #define IPSEC_DIR_MAX 3 181 #define IPSEC_DIR_INVALID 4 182 183 /* Policy level */ 184 /* 185 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 186 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 187 * DISCARD and NONE are allowed for system default. 188 */ 189 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 190 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 191 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 192 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 193 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 194 195 /* Security protocol level */ 196 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 197 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 198 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 199 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 200 201 #define IPSEC_MANUAL_REQID_MAX 0x3fff 202 /* 203 * if security policy level == unique, this id 204 * indicate to a relative SA for use, else is 205 * zero. 206 * 1 - 0x3fff are reserved for manual keying. 207 * 0 are reserved for above reason. Others is 208 * for kernel use. 209 * Note that this id doesn't identify SA 210 * by only itself. 211 */ 212 #define IPSEC_REPLAYWSIZE 32 213 214 /* statistics for ipsec processing */ 215 struct ipsecstat { 216 u_quad_t in_success; /* succeeded inbound process */ 217 u_quad_t in_polvio; 218 /* security policy violation for inbound process */ 219 u_quad_t in_nosa; /* inbound SA is unavailable */ 220 u_quad_t in_inval; /* inbound processing failed due to EINVAL */ 221 u_quad_t in_nomem; /* inbound processing failed due to ENOBUFS */ 222 u_quad_t in_badspi; /* failed getting a SPI */ 223 u_quad_t in_ahreplay; /* AH replay check failed */ 224 u_quad_t in_espreplay; /* ESP replay check failed */ 225 u_quad_t in_ahauthsucc; /* AH authentication success */ 226 u_quad_t in_ahauthfail; /* AH authentication failure */ 227 u_quad_t in_espauthsucc; /* ESP authentication success */ 228 u_quad_t in_espauthfail; /* ESP authentication failure */ 229 u_quad_t in_esphist[256]; 230 u_quad_t in_ahhist[256]; 231 u_quad_t in_comphist[256]; 232 u_quad_t out_success; /* succeeded outbound process */ 233 u_quad_t out_polvio; 234 /* security policy violation for outbound process */ 235 u_quad_t out_nosa; /* outbound SA is unavailable */ 236 u_quad_t out_inval; /* outbound process failed due to EINVAL */ 237 u_quad_t out_nomem; /* inbound processing failed due to ENOBUFS */ 238 u_quad_t out_noroute; /* there is no route */ 239 u_quad_t out_esphist[256]; 240 u_quad_t out_ahhist[256]; 241 u_quad_t out_comphist[256]; 242 243 u_quad_t spdcachelookup; 244 u_quad_t spdcachemiss; 245 246 u_int32_t ips_in_polvio; /* input: sec policy violation */ 247 u_int32_t ips_out_polvio; /* output: sec policy violation */ 248 u_int32_t ips_out_nosa; /* output: SA unavailable */ 249 u_int32_t ips_out_nomem; /* output: no memory available */ 250 u_int32_t ips_out_noroute; /* output: no route available */ 251 u_int32_t ips_out_inval; /* output: generic error */ 252 u_int32_t ips_out_bundlesa; /* output: bundled SA processed */ 253 u_int32_t ips_mbcoalesced; /* mbufs coalesced during clone */ 254 u_int32_t ips_clcoalesced; /* clusters coalesced during clone */ 255 u_int32_t ips_clcopied; /* clusters copied during clone */ 256 u_int32_t ips_mbinserted; /* mbufs inserted during makespace */ 257 /* 258 * Temporary statistics for performance analysis. 259 */ 260 /* See where ESP/AH/IPCOMP header land in mbuf on input */ 261 u_int32_t ips_input_front; 262 u_int32_t ips_input_middle; 263 u_int32_t ips_input_end; 264 }; 265 266 /* 267 * Definitions for IPsec & Key sysctl operations. 268 */ 269 /* 270 * Names for IPsec & Key sysctl objects 271 */ 272 #define IPSECCTL_STATS 1 /* stats */ 273 #define IPSECCTL_DEF_POLICY 2 274 #define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 275 #define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 276 #define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 277 #define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 278 #if 0 /* obsolete, do not reuse */ 279 #define IPSECCTL_INBOUND_CALL_IKE 7 280 #endif 281 #define IPSECCTL_AH_CLEARTOS 8 282 #define IPSECCTL_AH_OFFSETMASK 9 283 #define IPSECCTL_DFBIT 10 284 #define IPSECCTL_ECN 11 285 #define IPSECCTL_DEBUG 12 286 #define IPSECCTL_ESP_RANDPAD 13 287 #define IPSECCTL_MAXID 14 288 289 #define IPSECCTL_NAMES { \ 290 { 0, 0 }, \ 291 { 0, 0 }, \ 292 { "def_policy", CTLTYPE_INT }, \ 293 { "esp_trans_deflev", CTLTYPE_INT }, \ 294 { "esp_net_deflev", CTLTYPE_INT }, \ 295 { "ah_trans_deflev", CTLTYPE_INT }, \ 296 { "ah_net_deflev", CTLTYPE_INT }, \ 297 { 0, 0 }, \ 298 { "ah_cleartos", CTLTYPE_INT }, \ 299 { "ah_offsetmask", CTLTYPE_INT }, \ 300 { "dfbit", CTLTYPE_INT }, \ 301 { "ecn", CTLTYPE_INT }, \ 302 { "debug", CTLTYPE_INT }, \ 303 { "esp_randpad", CTLTYPE_INT }, \ 304 } 305 306 #define IPSEC6CTL_NAMES { \ 307 { 0, 0 }, \ 308 { 0, 0 }, \ 309 { "def_policy", CTLTYPE_INT }, \ 310 { "esp_trans_deflev", CTLTYPE_INT }, \ 311 { "esp_net_deflev", CTLTYPE_INT }, \ 312 { "ah_trans_deflev", CTLTYPE_INT }, \ 313 { "ah_net_deflev", CTLTYPE_INT }, \ 314 { 0, 0 }, \ 315 { 0, 0 }, \ 316 { 0, 0 }, \ 317 { 0, 0 }, \ 318 { "ecn", CTLTYPE_INT }, \ 319 { "debug", CTLTYPE_INT }, \ 320 { "esp_randpad", CTLTYPE_INT }, \ 321 } 322 323 #ifdef _KERNEL 324 struct ipsec_output_state { 325 struct mbuf *m; 326 struct route *ro; 327 struct sockaddr *dst; 328 }; 329 330 struct ipsec_history { 331 int ih_proto; 332 u_int32_t ih_spi; 333 }; 334 335 extern int ipsec_debug; 336 #ifdef REGRESSION 337 extern int ipsec_replay; 338 extern int ipsec_integrity; 339 #endif 340 341 extern struct ipsecstat ipsec4stat; 342 extern struct secpolicy ip4_def_policy; 343 extern int ip4_esp_trans_deflev; 344 extern int ip4_esp_net_deflev; 345 extern int ip4_ah_trans_deflev; 346 extern int ip4_ah_net_deflev; 347 extern int ip4_ah_cleartos; 348 extern int ip4_ah_offsetmask; 349 extern int ip4_ipsec_dfbit; 350 extern int ip4_ipsec_ecn; 351 extern int ip4_esp_randpad; 352 extern int crypto_support; 353 354 #define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0) 355 /* for openbsd compatibility */ 356 #define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0) 357 358 extern struct ipsecrequest *ipsec_newisr(void); 359 extern void ipsec_delisr(struct ipsecrequest *); 360 361 struct tdb_ident; 362 extern void ipsec_init(void); 363 extern struct secpolicy *ipsec_getpolicy __P((struct tdb_ident*, u_int)); 364 struct inpcb; 365 extern struct secpolicy *ipsec4_checkpolicy __P((struct mbuf *, u_int, u_int, 366 int *, struct inpcb *)); 367 extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, 368 int, int *); 369 370 struct inpcb; 371 extern int ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **)); 372 extern int ipsec_copy_policy 373 __P((struct inpcbpolicy *, struct inpcbpolicy *)); 374 extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *)); 375 extern int ipsec_in_reject __P((struct secpolicy *, struct mbuf *)); 376 377 extern int ipsec_set_policy __P((struct inpcb *inp, int optname, 378 caddr_t request, size_t len, struct ucred *cred)); 379 extern int ipsec_get_policy __P((struct inpcb *inpcb, caddr_t request, 380 size_t len, struct mbuf **mp)); 381 extern int ipsec_delete_pcbpolicy __P((struct inpcb *)); 382 extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *)); 383 384 struct secas; 385 struct tcpcb; 386 extern int ipsec_chkreplay __P((u_int32_t, struct secasvar *)); 387 extern int ipsec_updatereplay __P((u_int32_t, struct secasvar *)); 388 389 extern size_t ipsec_hdrsiz __P((struct mbuf *, u_int, struct inpcb *)); 390 extern size_t ipsec_hdrsiz_tcp __P((struct tcpcb *)); 391 392 union sockaddr_union; 393 extern char * ipsec_address(union sockaddr_union* sa); 394 extern const char *ipsec_logsastr __P((struct secasvar *)); 395 396 extern void ipsec_dumpmbuf __P((struct mbuf *)); 397 398 struct m_tag; 399 extern void ah4_input(struct mbuf *m, int off); 400 extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *); 401 extern void esp4_input(struct mbuf *m, int off); 402 extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *); 403 extern void ipcomp4_input(struct mbuf *m, int off); 404 extern int ipsec4_common_input(struct mbuf *m, ...); 405 extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, 406 int skip, int protoff, struct m_tag *mt); 407 extern int ipsec4_process_packet __P((struct mbuf *, struct ipsecrequest *, 408 int, int)); 409 extern int ipsec_process_done __P((struct mbuf *, struct ipsecrequest *)); 410 411 extern struct mbuf *ipsec_copypkt __P((struct mbuf *)); 412 413 extern void m_checkalignment(const char* where, struct mbuf *m0, 414 int off, int len); 415 extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 416 extern caddr_t m_pad(struct mbuf *m, int n); 417 extern int m_striphdr(struct mbuf *m, int skip, int hlen); 418 419 #ifdef DEV_ENC 420 #define ENC_BEFORE 0x0001 421 #define ENC_AFTER 0x0002 422 #define ENC_IN 0x0100 423 #define ENC_OUT 0x0200 424 extern int ipsec_filter(struct mbuf **, int, int); 425 extern void ipsec_bpf(struct mbuf *, struct secasvar *, int, int); 426 #endif 427 #endif /* _KERNEL */ 428 429 #ifndef _KERNEL 430 extern caddr_t ipsec_set_policy __P((char *, int)); 431 extern int ipsec_get_policylen __P((caddr_t)); 432 extern char *ipsec_dump_policy __P((caddr_t, char *)); 433 434 extern const char *ipsec_strerror __P((void)); 435 436 #else 437 #include <netipsec/vipsec.h> 438 #endif /* ! KERNEL */ 439 440 #endif /* _NETIPSEC_IPSEC_H_ */ 441