ipsec.h revision 175892
1/* $FreeBSD: head/sys/netipsec/ipsec.h 175892 2008-02-02 14:11:31Z bz $ */ 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#include <netipsec/ipsec_osdep.h> 48 49#ifdef _KERNEL 50 51/* 52 * Security Policy Index 53 * Ensure that both address families in the "src" and "dst" are same. 54 * When the value of the ul_proto is ICMPv6, the port field in "src" 55 * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code. 56 */ 57struct secpolicyindex { 58 u_int8_t dir; /* direction of packet flow, see blow */ 59 union sockaddr_union src; /* IP src address for SP */ 60 union sockaddr_union dst; /* IP dst address for SP */ 61 u_int8_t prefs; /* prefix length in bits for src */ 62 u_int8_t prefd; /* prefix length in bits for dst */ 63 u_int16_t ul_proto; /* upper layer Protocol */ 64#ifdef notyet 65 uid_t uids; 66 uid_t uidd; 67 gid_t gids; 68 gid_t gidd; 69#endif 70}; 71 72/* Security Policy Data Base */ 73struct secpolicy { 74 LIST_ENTRY(secpolicy) chain; 75 struct mtx lock; 76 77 u_int refcnt; /* reference count */ 78 struct secpolicyindex spidx; /* selector */ 79 u_int32_t id; /* It's unique number on the system. */ 80 u_int state; /* 0: dead, others: alive */ 81#define IPSEC_SPSTATE_DEAD 0 82#define IPSEC_SPSTATE_ALIVE 1 83 u_int16_t policy; /* policy_type per pfkeyv2.h */ 84 u_int16_t scangen; /* scan generation # */ 85 struct ipsecrequest *req; 86 /* pointer to the ipsec request tree, */ 87 /* if policy == IPSEC else this value == NULL.*/ 88 89 /* 90 * lifetime handler. 91 * the policy can be used without limitiation if both lifetime and 92 * validtime are zero. 93 * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime. 94 * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime. 95 */ 96 time_t created; /* time created the policy */ 97 time_t lastused; /* updated every when kernel sends a packet */ 98 long lifetime; /* duration of the lifetime of this policy */ 99 long validtime; /* duration this policy is valid without use */ 100}; 101 102#define SECPOLICY_LOCK_INIT(_sp) \ 103 mtx_init(&(_sp)->lock, "ipsec policy", NULL, MTX_DEF) 104#define SECPOLICY_LOCK(_sp) mtx_lock(&(_sp)->lock) 105#define SECPOLICY_UNLOCK(_sp) mtx_unlock(&(_sp)->lock) 106#define SECPOLICY_LOCK_DESTROY(_sp) mtx_destroy(&(_sp)->lock) 107#define SECPOLICY_LOCK_ASSERT(_sp) mtx_assert(&(_sp)->lock, MA_OWNED) 108 109/* Request for IPsec */ 110struct ipsecrequest { 111 struct ipsecrequest *next; 112 /* pointer to next structure */ 113 /* If NULL, it means the end of chain. */ 114 struct secasindex saidx;/* hint for search proper SA */ 115 /* if __ss_len == 0 then no address specified.*/ 116 u_int level; /* IPsec level defined below. */ 117 118 struct secasvar *sav; /* place holder of SA for use */ 119 struct secpolicy *sp; /* back pointer to SP */ 120 struct mtx lock; /* to interlock updates */ 121}; 122 123/* 124 * Need recursion for when crypto callbacks happen directly, 125 * as in the case of software crypto. Need to look at how 126 * hard it is to remove this... 127 */ 128#define IPSECREQUEST_LOCK_INIT(_isr) \ 129 mtx_init(&(_isr)->lock, "ipsec request", NULL, MTX_DEF | MTX_RECURSE) 130#define IPSECREQUEST_LOCK(_isr) mtx_lock(&(_isr)->lock) 131#define IPSECREQUEST_UNLOCK(_isr) mtx_unlock(&(_isr)->lock) 132#define IPSECREQUEST_LOCK_DESTROY(_isr) mtx_destroy(&(_isr)->lock) 133#define IPSECREQUEST_LOCK_ASSERT(_isr) mtx_assert(&(_isr)->lock, MA_OWNED) 134 135/* security policy in PCB */ 136struct inpcbpolicy { 137 struct secpolicy *sp_in; 138 struct secpolicy *sp_out; 139 int priv; /* privileged socket ? */ 140}; 141 142/* SP acquiring list table. */ 143struct secspacq { 144 LIST_ENTRY(secspacq) chain; 145 146 struct secpolicyindex spidx; 147 148 time_t created; /* for lifetime */ 149 int count; /* for lifetime */ 150 /* XXX: here is mbuf place holder to be sent ? */ 151}; 152#endif /* _KERNEL */ 153 154/* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 155#define IPSEC_PORT_ANY 0 156#define IPSEC_ULPROTO_ANY 255 157#define IPSEC_PROTO_ANY 255 158 159/* mode of security protocol */ 160/* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 161#define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 162#define IPSEC_MODE_TRANSPORT 1 163#define IPSEC_MODE_TUNNEL 2 164#define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 165 166/* 167 * Direction of security policy. 168 * NOTE: Since INVALID is used just as flag. 169 * The other are used for loop counter too. 170 */ 171#define IPSEC_DIR_ANY 0 172#define IPSEC_DIR_INBOUND 1 173#define IPSEC_DIR_OUTBOUND 2 174#define IPSEC_DIR_MAX 3 175#define IPSEC_DIR_INVALID 4 176 177/* Policy level */ 178/* 179 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 180 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 181 * DISCARD and NONE are allowed for system default. 182 */ 183#define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 184#define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 185#define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 186#define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 187#define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 188 189/* Security protocol level */ 190#define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 191#define IPSEC_LEVEL_USE 1 /* use SA if present. */ 192#define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 193#define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 194 195#define IPSEC_MANUAL_REQID_MAX 0x3fff 196 /* 197 * if security policy level == unique, this id 198 * indicate to a relative SA for use, else is 199 * zero. 200 * 1 - 0x3fff are reserved for manual keying. 201 * 0 are reserved for above reason. Others is 202 * for kernel use. 203 * Note that this id doesn't identify SA 204 * by only itself. 205 */ 206#define IPSEC_REPLAYWSIZE 32 207 208/* statistics for ipsec processing */ 209struct ipsecstat { 210 u_quad_t in_success; /* succeeded inbound process */ 211 u_quad_t in_polvio; 212 /* security policy violation for inbound process */ 213 u_quad_t in_nosa; /* inbound SA is unavailable */ 214 u_quad_t in_inval; /* inbound processing failed due to EINVAL */ 215 u_quad_t in_nomem; /* inbound processing failed due to ENOBUFS */ 216 u_quad_t in_badspi; /* failed getting a SPI */ 217 u_quad_t in_ahreplay; /* AH replay check failed */ 218 u_quad_t in_espreplay; /* ESP replay check failed */ 219 u_quad_t in_ahauthsucc; /* AH authentication success */ 220 u_quad_t in_ahauthfail; /* AH authentication failure */ 221 u_quad_t in_espauthsucc; /* ESP authentication success */ 222 u_quad_t in_espauthfail; /* ESP authentication failure */ 223 u_quad_t in_esphist[256]; 224 u_quad_t in_ahhist[256]; 225 u_quad_t in_comphist[256]; 226 u_quad_t out_success; /* succeeded outbound process */ 227 u_quad_t out_polvio; 228 /* security policy violation for outbound process */ 229 u_quad_t out_nosa; /* outbound SA is unavailable */ 230 u_quad_t out_inval; /* outbound process failed due to EINVAL */ 231 u_quad_t out_nomem; /* inbound processing failed due to ENOBUFS */ 232 u_quad_t out_noroute; /* there is no route */ 233 u_quad_t out_esphist[256]; 234 u_quad_t out_ahhist[256]; 235 u_quad_t out_comphist[256]; 236 237 u_quad_t spdcachelookup; 238 u_quad_t spdcachemiss; 239 240 u_int32_t ips_in_polvio; /* input: sec policy violation */ 241 u_int32_t ips_out_polvio; /* output: sec policy violation */ 242 u_int32_t ips_out_nosa; /* output: SA unavailable */ 243 u_int32_t ips_out_nomem; /* output: no memory available */ 244 u_int32_t ips_out_noroute; /* output: no route available */ 245 u_int32_t ips_out_inval; /* output: generic error */ 246 u_int32_t ips_out_bundlesa; /* output: bundled SA processed */ 247 u_int32_t ips_mbcoalesced; /* mbufs coalesced during clone */ 248 u_int32_t ips_clcoalesced; /* clusters coalesced during clone */ 249 u_int32_t ips_clcopied; /* clusters copied during clone */ 250 u_int32_t ips_mbinserted; /* mbufs inserted during makespace */ 251 /* 252 * Temporary statistics for performance analysis. 253 */ 254 /* See where ESP/AH/IPCOMP header land in mbuf on input */ 255 u_int32_t ips_input_front; 256 u_int32_t ips_input_middle; 257 u_int32_t ips_input_end; 258}; 259 260/* 261 * Definitions for IPsec & Key sysctl operations. 262 */ 263/* 264 * Names for IPsec & Key sysctl objects 265 */ 266#define IPSECCTL_STATS 1 /* stats */ 267#define IPSECCTL_DEF_POLICY 2 268#define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 269#define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 270#define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 271#define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 272#if 0 /* obsolete, do not reuse */ 273#define IPSECCTL_INBOUND_CALL_IKE 7 274#endif 275#define IPSECCTL_AH_CLEARTOS 8 276#define IPSECCTL_AH_OFFSETMASK 9 277#define IPSECCTL_DFBIT 10 278#define IPSECCTL_ECN 11 279#define IPSECCTL_DEBUG 12 280#define IPSECCTL_ESP_RANDPAD 13 281#define IPSECCTL_MAXID 14 282 283#define IPSECCTL_NAMES { \ 284 { 0, 0 }, \ 285 { 0, 0 }, \ 286 { "def_policy", CTLTYPE_INT }, \ 287 { "esp_trans_deflev", CTLTYPE_INT }, \ 288 { "esp_net_deflev", CTLTYPE_INT }, \ 289 { "ah_trans_deflev", CTLTYPE_INT }, \ 290 { "ah_net_deflev", CTLTYPE_INT }, \ 291 { 0, 0 }, \ 292 { "ah_cleartos", CTLTYPE_INT }, \ 293 { "ah_offsetmask", CTLTYPE_INT }, \ 294 { "dfbit", CTLTYPE_INT }, \ 295 { "ecn", CTLTYPE_INT }, \ 296 { "debug", CTLTYPE_INT }, \ 297 { "esp_randpad", CTLTYPE_INT }, \ 298} 299 300#define IPSEC6CTL_NAMES { \ 301 { 0, 0 }, \ 302 { 0, 0 }, \ 303 { "def_policy", CTLTYPE_INT }, \ 304 { "esp_trans_deflev", CTLTYPE_INT }, \ 305 { "esp_net_deflev", CTLTYPE_INT }, \ 306 { "ah_trans_deflev", CTLTYPE_INT }, \ 307 { "ah_net_deflev", CTLTYPE_INT }, \ 308 { 0, 0 }, \ 309 { 0, 0 }, \ 310 { 0, 0 }, \ 311 { 0, 0 }, \ 312 { "ecn", CTLTYPE_INT }, \ 313 { "debug", CTLTYPE_INT }, \ 314 { "esp_randpad", CTLTYPE_INT }, \ 315} 316 317#ifdef _KERNEL 318struct ipsec_output_state { 319 struct mbuf *m; 320 struct route *ro; 321 struct sockaddr *dst; 322}; 323 324struct ipsec_history { 325 int ih_proto; 326 u_int32_t ih_spi; 327}; 328 329extern int ipsec_debug; 330#ifdef REGRESSION 331extern int ipsec_replay; 332extern int ipsec_integrity; 333#endif 334 335extern struct ipsecstat ipsec4stat; 336extern struct secpolicy ip4_def_policy; 337extern int ip4_esp_trans_deflev; 338extern int ip4_esp_net_deflev; 339extern int ip4_ah_trans_deflev; 340extern int ip4_ah_net_deflev; 341extern int ip4_ah_cleartos; 342extern int ip4_ah_offsetmask; 343extern int ip4_ipsec_dfbit; 344extern int ip4_ipsec_ecn; 345extern int ip4_esp_randpad; 346extern int crypto_support; 347 348#define ipseclog(x) do { if (ipsec_debug) log x; } while (0) 349/* for openbsd compatibility */ 350#define DPRINTF(x) do { if (ipsec_debug) printf x; } while (0) 351 352extern struct ipsecrequest *ipsec_newisr(void); 353extern void ipsec_delisr(struct ipsecrequest *); 354 355struct tdb_ident; 356extern struct secpolicy *ipsec_getpolicy __P((struct tdb_ident*, u_int)); 357struct inpcb; 358extern struct secpolicy *ipsec4_checkpolicy __P((struct mbuf *, u_int, u_int, 359 int *, struct inpcb *)); 360extern struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 361 struct inpcb *, int *); 362extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, 363 int, int *); 364 365struct inpcb; 366extern int ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **)); 367extern int ipsec_copy_policy 368 __P((struct inpcbpolicy *, struct inpcbpolicy *)); 369extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *)); 370extern int ipsec_in_reject __P((struct secpolicy *, struct mbuf *)); 371 372extern int ipsec4_set_policy __P((struct inpcb *inp, int optname, 373 caddr_t request, size_t len, struct ucred *cred)); 374extern int ipsec4_get_policy __P((struct inpcb *inpcb, caddr_t request, 375 size_t len, struct mbuf **mp)); 376extern int ipsec4_delete_pcbpolicy __P((struct inpcb *)); 377extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *)); 378 379struct secas; 380struct tcpcb; 381extern int ipsec_chkreplay __P((u_int32_t, struct secasvar *)); 382extern int ipsec_updatereplay __P((u_int32_t, struct secasvar *)); 383 384extern size_t ipsec4_hdrsiz __P((struct mbuf *, u_int, struct inpcb *)); 385extern size_t ipsec_hdrsiz_tcp __P((struct tcpcb *)); 386 387union sockaddr_union; 388extern char * ipsec_address(union sockaddr_union* sa); 389extern const char *ipsec_logsastr __P((struct secasvar *)); 390 391extern void ipsec_dumpmbuf __P((struct mbuf *)); 392 393struct m_tag; 394extern void ah4_input(struct mbuf *m, int off); 395extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *); 396extern void esp4_input(struct mbuf *m, int off); 397extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *); 398extern void ipcomp4_input(struct mbuf *m, int off); 399extern int ipsec4_common_input(struct mbuf *m, ...); 400extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, 401 int skip, int protoff, struct m_tag *mt); 402extern int ipsec4_process_packet __P((struct mbuf *, struct ipsecrequest *, 403 int, int)); 404extern int ipsec_process_done __P((struct mbuf *, struct ipsecrequest *)); 405 406extern struct mbuf *ipsec_copypkt __P((struct mbuf *)); 407 408extern void m_checkalignment(const char* where, struct mbuf *m0, 409 int off, int len); 410extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 411extern caddr_t m_pad(struct mbuf *m, int n); 412extern int m_striphdr(struct mbuf *m, int skip, int hlen); 413 414#ifdef DEV_ENC 415#define ENC_BEFORE 0x0001 416#define ENC_AFTER 0x0002 417#define ENC_IN 0x0100 418#define ENC_OUT 0x0200 419extern int ipsec_filter(struct mbuf **, int, int); 420extern void ipsec_bpf(struct mbuf *, struct secasvar *, int, int); 421#endif 422#endif /* _KERNEL */ 423 424#ifndef _KERNEL 425extern caddr_t ipsec_set_policy __P((char *, int)); 426extern int ipsec_get_policylen __P((caddr_t)); 427extern char *ipsec_dump_policy __P((caddr_t, char *)); 428 429extern const char *ipsec_strerror __P((void)); 430#endif /* !_KERNEL */ 431 432#endif /* _NETIPSEC_IPSEC_H_ */ 433