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 below */ 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 rwlock 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 rw_init_flags(&(_isr)->lock, "ipsec request", RW_RECURSE) 136 #define IPSECREQUEST_LOCK(_isr) rw_rlock(&(_isr)->lock) 137 #define IPSECREQUEST_UNLOCK(_isr) rw_runlock(&(_isr)->lock) 138 #define IPSECREQUEST_WLOCK(_isr) rw_wlock(&(_isr)->lock) 139 #define IPSECREQUEST_WUNLOCK(_isr) rw_wunlock(&(_isr)->lock) 140 #define IPSECREQUEST_UPGRADE(_isr) rw_try_upgrade(&(_isr)->lock) 141 #define IPSECREQUEST_DOWNGRADE(_isr) rw_downgrade(&(_isr)->lock) 142 #define IPSECREQUEST_LOCK_DESTROY(_isr) rw_destroy(&(_isr)->lock) 143 #define IPSECREQUEST_LOCK_ASSERT(_isr) rw_assert(&(_isr)->lock, RA_LOCKED) 144 145 /* security policy in PCB */ 146 struct inpcbpolicy { 147 struct secpolicy *sp_in; 148 struct secpolicy *sp_out; 149 int priv; /* privileged socket ? */ 150 }; 151 152 /* SP acquiring list table. */ 153 struct secspacq { 154 LIST_ENTRY(secspacq) chain; 155 156 struct secpolicyindex spidx; 157 158 time_t created; /* for lifetime */ 159 int count; /* for lifetime */ 160 /* XXX: here is mbuf place holder to be sent ? */ 161 }; 162 #endif /* _KERNEL */ 163 164 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 165 #define IPSEC_PORT_ANY 0 166 #define IPSEC_ULPROTO_ANY 255 167 #define IPSEC_PROTO_ANY 255 168 169 /* mode of security protocol */ 170 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 171 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 172 #define IPSEC_MODE_TRANSPORT 1 173 #define IPSEC_MODE_TUNNEL 2 174 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 175 176 /* 177 * Direction of security policy. 178 * NOTE: Since INVALID is used just as flag. 179 * The other are used for loop counter too. 180 */ 181 #define IPSEC_DIR_ANY 0 182 #define IPSEC_DIR_INBOUND 1 183 #define IPSEC_DIR_OUTBOUND 2 184 #define IPSEC_DIR_MAX 3 185 #define IPSEC_DIR_INVALID 4 186 187 /* Policy level */ 188 /* 189 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 190 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 191 * DISCARD and NONE are allowed for system default. 192 */ 193 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 194 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 195 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 196 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 197 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 198 199 /* Security protocol level */ 200 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 201 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 202 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 203 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 204 205 #define IPSEC_MANUAL_REQID_MAX 0x3fff 206 /* 207 * if security policy level == unique, this id 208 * indicate to a relative SA for use, else is 209 * zero. 210 * 1 - 0x3fff are reserved for manual keying. 211 * 0 are reserved for above reason. Others is 212 * for kernel use. 213 * Note that this id doesn't identify SA 214 * by only itself. 215 */ 216 #define IPSEC_REPLAYWSIZE 32 217 218 /* statistics for ipsec processing */ 219 struct ipsecstat { 220 uint64_t ips_in_polvio; /* input: sec policy violation */ 221 uint64_t ips_in_nomem; /* input: no memory available */ 222 uint64_t ips_in_inval; /* input: generic error */ 223 224 uint64_t ips_out_polvio; /* output: sec policy violation */ 225 uint64_t ips_out_nosa; /* output: SA unavailable */ 226 uint64_t ips_out_nomem; /* output: no memory available */ 227 uint64_t ips_out_noroute; /* output: no route available */ 228 uint64_t ips_out_inval; /* output: generic error */ 229 uint64_t ips_out_bundlesa; /* output: bundled SA processed */ 230 231 uint64_t ips_mbcoalesced; /* mbufs coalesced during clone */ 232 uint64_t ips_clcoalesced; /* clusters coalesced during clone */ 233 uint64_t ips_clcopied; /* clusters copied during clone */ 234 uint64_t ips_mbinserted; /* mbufs inserted during makespace */ 235 /* 236 * Temporary statistics for performance analysis. 237 */ 238 /* See where ESP/AH/IPCOMP header land in mbuf on input */ 239 uint64_t ips_input_front; 240 uint64_t ips_input_middle; 241 uint64_t ips_input_end; 242 }; 243 244 /* 245 * Definitions for IPsec & Key sysctl operations. 246 */ 247 /* 248 * Names for IPsec & Key sysctl objects 249 */ 250 #define IPSECCTL_STATS 1 /* stats */ 251 #define IPSECCTL_DEF_POLICY 2 252 #define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 253 #define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 254 #define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 255 #define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 256 #if 0 /* obsolete, do not reuse */ 257 #define IPSECCTL_INBOUND_CALL_IKE 7 258 #endif 259 #define IPSECCTL_AH_CLEARTOS 8 260 #define IPSECCTL_AH_OFFSETMASK 9 261 #define IPSECCTL_DFBIT 10 262 #define IPSECCTL_ECN 11 263 #define IPSECCTL_DEBUG 12 264 #define IPSECCTL_ESP_RANDPAD 13 265 #define IPSECCTL_MAXID 14 266 267 #define IPSECCTL_NAMES { \ 268 { 0, 0 }, \ 269 { 0, 0 }, \ 270 { "def_policy", CTLTYPE_INT }, \ 271 { "esp_trans_deflev", CTLTYPE_INT }, \ 272 { "esp_net_deflev", CTLTYPE_INT }, \ 273 { "ah_trans_deflev", CTLTYPE_INT }, \ 274 { "ah_net_deflev", CTLTYPE_INT }, \ 275 { 0, 0 }, \ 276 { "ah_cleartos", CTLTYPE_INT }, \ 277 { "ah_offsetmask", CTLTYPE_INT }, \ 278 { "dfbit", CTLTYPE_INT }, \ 279 { "ecn", CTLTYPE_INT }, \ 280 { "debug", CTLTYPE_INT }, \ 281 { "esp_randpad", CTLTYPE_INT }, \ 282 } 283 284 #define IPSEC6CTL_NAMES { \ 285 { 0, 0 }, \ 286 { 0, 0 }, \ 287 { "def_policy", CTLTYPE_INT }, \ 288 { "esp_trans_deflev", CTLTYPE_INT }, \ 289 { "esp_net_deflev", CTLTYPE_INT }, \ 290 { "ah_trans_deflev", CTLTYPE_INT }, \ 291 { "ah_net_deflev", CTLTYPE_INT }, \ 292 { 0, 0 }, \ 293 { 0, 0 }, \ 294 { 0, 0 }, \ 295 { 0, 0 }, \ 296 { "ecn", CTLTYPE_INT }, \ 297 { "debug", CTLTYPE_INT }, \ 298 { "esp_randpad", CTLTYPE_INT }, \ 299 } 300 301 #ifdef _KERNEL 302 #include <sys/counter.h> 303 304 struct ipsec_output_state { 305 struct mbuf *m; 306 struct route *ro; 307 struct sockaddr *dst; 308 }; 309 310 struct ipsec_history { 311 int ih_proto; 312 u_int32_t ih_spi; 313 }; 314 315 VNET_DECLARE(int, ipsec_debug); 316 #define V_ipsec_debug VNET(ipsec_debug) 317 318 #ifdef REGRESSION 319 VNET_DECLARE(int, ipsec_replay); 320 VNET_DECLARE(int, ipsec_integrity); 321 322 #define V_ipsec_replay VNET(ipsec_replay) 323 #define V_ipsec_integrity VNET(ipsec_integrity) 324 #endif 325 326 VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat); 327 VNET_DECLARE(struct secpolicy, ip4_def_policy); 328 VNET_DECLARE(int, ip4_esp_trans_deflev); 329 VNET_DECLARE(int, ip4_esp_net_deflev); 330 VNET_DECLARE(int, ip4_ah_trans_deflev); 331 VNET_DECLARE(int, ip4_ah_net_deflev); 332 VNET_DECLARE(int, ip4_ah_offsetmask); 333 VNET_DECLARE(int, ip4_ipsec_dfbit); 334 VNET_DECLARE(int, ip4_ipsec_ecn); 335 VNET_DECLARE(int, ip4_esp_randpad); 336 VNET_DECLARE(int, crypto_support); 337 338 #define IPSECSTAT_INC(name) \ 339 VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1) 340 #define V_ip4_def_policy VNET(ip4_def_policy) 341 #define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev) 342 #define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev) 343 #define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev) 344 #define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev) 345 #define V_ip4_ah_offsetmask VNET(ip4_ah_offsetmask) 346 #define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit) 347 #define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn) 348 #define V_ip4_esp_randpad VNET(ip4_esp_randpad) 349 #define V_crypto_support VNET(crypto_support) 350 351 #define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0) 352 /* for openbsd compatibility */ 353 #define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0) 354 355 extern struct ipsecrequest *ipsec_newisr(void); 356 extern void ipsec_delisr(struct ipsecrequest *); 357 358 struct tdb_ident; 359 extern struct secpolicy *ipsec_getpolicy __P((struct tdb_ident*, u_int)); 360 struct inpcb; 361 extern struct secpolicy *ipsec4_checkpolicy __P((struct mbuf *, u_int, u_int, 362 int *, struct inpcb *)); 363 extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, 364 int, int *); 365 366 struct inpcb; 367 extern int ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **)); 368 extern int ipsec_copy_policy 369 __P((struct inpcbpolicy *, struct inpcbpolicy *)); 370 extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *)); 371 extern int ipsec_in_reject __P((struct secpolicy *, struct mbuf *)); 372 373 extern int ipsec_set_policy __P((struct inpcb *inp, int optname, 374 caddr_t request, size_t len, struct ucred *cred)); 375 extern int ipsec_get_policy __P((struct inpcb *inpcb, caddr_t request, 376 size_t len, struct mbuf **mp)); 377 extern int ipsec_delete_pcbpolicy __P((struct inpcb *)); 378 extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *)); 379 380 struct secas; 381 struct tcpcb; 382 extern int ipsec_chkreplay __P((u_int32_t, struct secasvar *)); 383 extern int ipsec_updatereplay __P((u_int32_t, struct secasvar *)); 384 385 extern size_t ipsec_hdrsiz __P((struct mbuf *, u_int, struct inpcb *)); 386 extern size_t ipsec_hdrsiz_tcp __P((struct tcpcb *)); 387 388 union sockaddr_union; 389 extern char * ipsec_address(union sockaddr_union* sa); 390 extern const char *ipsec_logsastr __P((struct secasvar *)); 391 392 extern void ipsec_dumpmbuf __P((struct mbuf *)); 393 394 struct m_tag; 395 extern void ah4_input(struct mbuf *m, int off); 396 extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *); 397 extern void esp4_input(struct mbuf *m, int off); 398 extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *); 399 extern void ipcomp4_input(struct mbuf *m, int off); 400 extern int ipsec4_common_input(struct mbuf *m, ...); 401 extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, 402 int skip, int protoff, struct m_tag *mt); 403 extern int ipsec4_process_packet __P((struct mbuf *, struct ipsecrequest *, 404 int, int)); 405 extern int ipsec_process_done __P((struct mbuf *, struct ipsecrequest *)); 406 407 extern struct mbuf *ipsec_copypkt __P((struct mbuf *)); 408 409 extern void m_checkalignment(const char* where, struct mbuf *m0, 410 int off, int len); 411 extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 412 extern caddr_t m_pad(struct mbuf *m, int n); 413 extern int m_striphdr(struct mbuf *m, int skip, int hlen); 414 415 #ifdef DEV_ENC 416 #define ENC_BEFORE 0x0001 417 #define ENC_AFTER 0x0002 418 #define ENC_IN 0x0100 419 #define ENC_OUT 0x0200 420 extern int ipsec_filter(struct mbuf **, int, int); 421 extern void ipsec_bpf(struct mbuf *, struct secasvar *, int, int); 422 #endif 423 #endif /* _KERNEL */ 424 425 #ifndef _KERNEL 426 extern caddr_t ipsec_set_policy __P((char *, int)); 427 extern int ipsec_get_policylen __P((caddr_t)); 428 extern char *ipsec_dump_policy __P((caddr_t, char *)); 429 430 extern const char *ipsec_strerror __P((void)); 431 432 #endif /* ! KERNEL */ 433 434 #endif /* _NETIPSEC_IPSEC_H_ */ 435