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 #include <sys/_lock.h> 51 #include <sys/_mutex.h> 52 #include <sys/_rwlock.h> 53 54 #define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m) 55 56 #define IPSEC_IS_PRIVILEGED_SO(_so) \ 57 ((_so)->so_cred != NULL && \ 58 priv_check_cred((_so)->so_cred, PRIV_NETINET_IPSEC, 0) \ 59 == 0) 60 61 /* 62 * Security Policy Index 63 * Ensure that both address families in the "src" and "dst" are same. 64 * When the value of the ul_proto is ICMPv6, the port field in "src" 65 * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code. 66 */ 67 struct secpolicyindex { 68 u_int8_t dir; /* direction of packet flow, see below */ 69 union sockaddr_union src; /* IP src address for SP */ 70 union sockaddr_union dst; /* IP dst address for SP */ 71 u_int8_t prefs; /* prefix length in bits for src */ 72 u_int8_t prefd; /* prefix length in bits for dst */ 73 u_int16_t ul_proto; /* upper layer Protocol */ 74 #ifdef notyet 75 uid_t uids; 76 uid_t uidd; 77 gid_t gids; 78 gid_t gidd; 79 #endif 80 }; 81 82 /* Security Policy Data Base */ 83 struct secpolicy { 84 TAILQ_ENTRY(secpolicy) chain; 85 86 struct secpolicyindex spidx; /* selector */ 87 struct ipsecrequest *req; 88 /* pointer to the ipsec request tree, */ 89 /* if policy == IPSEC else this value == NULL.*/ 90 u_int refcnt; /* reference count */ 91 u_int policy; /* policy_type per pfkeyv2.h */ 92 u_int state; 93 #define IPSEC_SPSTATE_DEAD 0 94 #define IPSEC_SPSTATE_ALIVE 1 95 u_int32_t id; /* It's unique number on the system. */ 96 /* 97 * lifetime handler. 98 * the policy can be used without limitiation if both lifetime and 99 * validtime are zero. 100 * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime. 101 * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime. 102 */ 103 time_t created; /* time created the policy */ 104 time_t lastused; /* updated every when kernel sends a packet */ 105 long lifetime; /* duration of the lifetime of this policy */ 106 long validtime; /* duration this policy is valid without use */ 107 }; 108 109 /* Request for IPsec */ 110 struct 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 rwlock 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 rw_init_flags(&(_isr)->lock, "ipsec request", RW_RECURSE) 130 #define IPSECREQUEST_LOCK(_isr) rw_rlock(&(_isr)->lock) 131 #define IPSECREQUEST_UNLOCK(_isr) rw_runlock(&(_isr)->lock) 132 #define IPSECREQUEST_WLOCK(_isr) rw_wlock(&(_isr)->lock) 133 #define IPSECREQUEST_WUNLOCK(_isr) rw_wunlock(&(_isr)->lock) 134 #define IPSECREQUEST_UPGRADE(_isr) rw_try_upgrade(&(_isr)->lock) 135 #define IPSECREQUEST_DOWNGRADE(_isr) rw_downgrade(&(_isr)->lock) 136 #define IPSECREQUEST_LOCK_DESTROY(_isr) rw_destroy(&(_isr)->lock) 137 #define IPSECREQUEST_LOCK_ASSERT(_isr) rw_assert(&(_isr)->lock, RA_LOCKED) 138 139 /* security policy in PCB */ 140 struct inpcbpolicy { 141 struct secpolicy *sp_in; 142 struct secpolicy *sp_out; 143 int priv; /* privileged socket ? */ 144 }; 145 146 /* SP acquiring list table. */ 147 struct secspacq { 148 LIST_ENTRY(secspacq) chain; 149 150 struct secpolicyindex spidx; 151 152 time_t created; /* for lifetime */ 153 int count; /* for lifetime */ 154 /* XXX: here is mbuf place holder to be sent ? */ 155 }; 156 #endif /* _KERNEL */ 157 158 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 159 #define IPSEC_PORT_ANY 0 160 #define IPSEC_ULPROTO_ANY 255 161 #define IPSEC_PROTO_ANY 255 162 163 /* mode of security protocol */ 164 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 165 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 166 #define IPSEC_MODE_TRANSPORT 1 167 #define IPSEC_MODE_TUNNEL 2 168 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 169 170 /* 171 * Direction of security policy. 172 * NOTE: Since INVALID is used just as flag. 173 * The other are used for loop counter too. 174 */ 175 #define IPSEC_DIR_ANY 0 176 #define IPSEC_DIR_INBOUND 1 177 #define IPSEC_DIR_OUTBOUND 2 178 #define IPSEC_DIR_MAX 3 179 #define IPSEC_DIR_INVALID 4 180 181 /* Policy level */ 182 /* 183 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 184 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 185 * DISCARD and NONE are allowed for system default. 186 */ 187 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 188 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 189 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 190 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 191 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 192 193 /* Security protocol level */ 194 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 195 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 196 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 197 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 198 199 #define IPSEC_MANUAL_REQID_MAX 0x3fff 200 /* 201 * if security policy level == unique, this id 202 * indicate to a relative SA for use, else is 203 * zero. 204 * 1 - 0x3fff are reserved for manual keying. 205 * 0 are reserved for above reason. Others is 206 * for kernel use. 207 * Note that this id doesn't identify SA 208 * by only itself. 209 */ 210 #define IPSEC_REPLAYWSIZE 32 211 212 /* statistics for ipsec processing */ 213 struct ipsecstat { 214 uint64_t ips_in_polvio; /* input: sec policy violation */ 215 uint64_t ips_in_nomem; /* input: no memory available */ 216 uint64_t ips_in_inval; /* input: generic error */ 217 218 uint64_t ips_out_polvio; /* output: sec policy violation */ 219 uint64_t ips_out_nosa; /* output: SA unavailable */ 220 uint64_t ips_out_nomem; /* output: no memory available */ 221 uint64_t ips_out_noroute; /* output: no route available */ 222 uint64_t ips_out_inval; /* output: generic error */ 223 uint64_t ips_out_bundlesa; /* output: bundled SA processed */ 224 225 uint64_t ips_mbcoalesced; /* mbufs coalesced during clone */ 226 uint64_t ips_clcoalesced; /* clusters coalesced during clone */ 227 uint64_t ips_clcopied; /* clusters copied during clone */ 228 uint64_t ips_mbinserted; /* mbufs inserted during makespace */ 229 /* 230 * Temporary statistics for performance analysis. 231 */ 232 /* See where ESP/AH/IPCOMP header land in mbuf on input */ 233 uint64_t ips_input_front; 234 uint64_t ips_input_middle; 235 uint64_t ips_input_end; 236 }; 237 238 /* 239 * Definitions for IPsec & Key sysctl operations. 240 */ 241 #define IPSECCTL_STATS 1 /* stats */ 242 #define IPSECCTL_DEF_POLICY 2 243 #define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 244 #define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 245 #define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 246 #define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 247 #if 0 /* obsolete, do not reuse */ 248 #define IPSECCTL_INBOUND_CALL_IKE 7 249 #endif 250 #define IPSECCTL_AH_CLEARTOS 8 251 #define IPSECCTL_AH_OFFSETMASK 9 252 #define IPSECCTL_DFBIT 10 253 #define IPSECCTL_ECN 11 254 #define IPSECCTL_DEBUG 12 255 #define IPSECCTL_ESP_RANDPAD 13 256 257 #ifdef _KERNEL 258 #include <sys/counter.h> 259 260 VNET_DECLARE(int, ipsec_debug); 261 #define V_ipsec_debug VNET(ipsec_debug) 262 263 #ifdef REGRESSION 264 VNET_DECLARE(int, ipsec_replay); 265 VNET_DECLARE(int, ipsec_integrity); 266 267 #define V_ipsec_replay VNET(ipsec_replay) 268 #define V_ipsec_integrity VNET(ipsec_integrity) 269 #endif 270 271 VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat); 272 VNET_DECLARE(int, ip4_esp_trans_deflev); 273 VNET_DECLARE(int, ip4_esp_net_deflev); 274 VNET_DECLARE(int, ip4_ah_trans_deflev); 275 VNET_DECLARE(int, ip4_ah_net_deflev); 276 VNET_DECLARE(int, ip4_ah_offsetmask); 277 VNET_DECLARE(int, ip4_ipsec_dfbit); 278 VNET_DECLARE(int, ip4_ipsec_ecn); 279 VNET_DECLARE(int, ip4_esp_randpad); 280 VNET_DECLARE(int, crypto_support); 281 282 #define IPSECSTAT_INC(name) \ 283 VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1) 284 #define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev) 285 #define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev) 286 #define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev) 287 #define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev) 288 #define V_ip4_ah_offsetmask VNET(ip4_ah_offsetmask) 289 #define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit) 290 #define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn) 291 #define V_ip4_esp_randpad VNET(ip4_esp_randpad) 292 #define V_crypto_support VNET(crypto_support) 293 294 #define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0) 295 /* for openbsd compatibility */ 296 #define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0) 297 298 extern struct ipsecrequest *ipsec_newisr(void); 299 extern void ipsec_delisr(struct ipsecrequest *); 300 301 struct tdb_ident; 302 extern struct secpolicy *ipsec_getpolicy(struct tdb_ident*, u_int); 303 struct inpcb; 304 extern struct secpolicy *ipsec4_checkpolicy(struct mbuf *, u_int, 305 int *, struct inpcb *); 306 extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, int *); 307 308 struct inpcb; 309 extern int ipsec_init_policy(struct socket *so, struct inpcbpolicy **); 310 extern int ipsec_copy_policy(struct inpcbpolicy *, struct inpcbpolicy *); 311 extern u_int ipsec_get_reqlevel(struct ipsecrequest *); 312 313 extern int ipsec_set_policy(struct inpcb *inp, int optname, 314 caddr_t request, size_t len, struct ucred *cred); 315 extern int ipsec_get_policy(struct inpcb *inpcb, caddr_t request, 316 size_t len, struct mbuf **mp); 317 extern int ipsec_delete_pcbpolicy(struct inpcb *); 318 extern int ipsec4_in_reject(struct mbuf *, struct inpcb *); 319 320 struct secas; 321 struct tcpcb; 322 extern int ipsec_chkreplay(u_int32_t, struct secasvar *); 323 extern int ipsec_updatereplay(u_int32_t, struct secasvar *); 324 325 extern size_t ipsec_hdrsiz(struct mbuf *, u_int, struct inpcb *); 326 extern size_t ipsec_hdrsiz_tcp(struct tcpcb *); 327 328 union sockaddr_union; 329 extern char *ipsec_address(union sockaddr_union *, char *, socklen_t); 330 extern char *ipsec_logsastr(struct secasvar *, char *, size_t); 331 332 extern void ipsec_dumpmbuf(struct mbuf *); 333 334 struct m_tag; 335 extern int ah4_input(struct mbuf **mp, int *offp, int proto); 336 extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *); 337 extern int esp4_input(struct mbuf **mp, int *offp, int proto); 338 extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *); 339 extern int ipcomp4_input(struct mbuf **mp, int *offp, int proto); 340 extern int ipsec_common_input(struct mbuf *m, int, int, int, int); 341 extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, 342 int skip, int protoff); 343 extern int ipsec4_process_packet(struct mbuf *, struct ipsecrequest *); 344 extern int ipsec_process_done(struct mbuf *, struct ipsecrequest *); 345 346 extern struct mbuf *ipsec_copypkt(struct mbuf *); 347 348 extern void m_checkalignment(const char* where, struct mbuf *m0, 349 int off, int len); 350 extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 351 extern caddr_t m_pad(struct mbuf *m, int n); 352 extern int m_striphdr(struct mbuf *m, int skip, int hlen); 353 354 #ifdef DEV_ENC 355 #define ENC_BEFORE 0x0001 356 #define ENC_AFTER 0x0002 357 #define ENC_IN 0x0100 358 #define ENC_OUT 0x0200 359 extern int ipsec_filter(struct mbuf **, int, int); 360 extern void ipsec_bpf(struct mbuf *, struct secasvar *, int, int); 361 #endif 362 #endif /* _KERNEL */ 363 364 #ifndef _KERNEL 365 extern caddr_t ipsec_set_policy(char *, int); 366 extern int ipsec_get_policylen(caddr_t); 367 extern char *ipsec_dump_policy(caddr_t, char *); 368 extern const char *ipsec_strerror(void); 369 370 #endif /* ! KERNEL */ 371 372 #endif /* _NETIPSEC_IPSEC_H_ */ 373