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 #include <net/pfkeyv2.h> 41 #include <netipsec/keydb.h> 42 43 #ifdef _KERNEL 44 45 #include <sys/_lock.h> 46 #include <sys/_mutex.h> 47 #include <sys/_rwlock.h> 48 49 #define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m) 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 */ 57 struct secpolicyindex { 58 union sockaddr_union src; /* IP src address for SP */ 59 union sockaddr_union dst; /* IP dst address for SP */ 60 uint8_t ul_proto; /* upper layer Protocol */ 61 uint8_t dir; /* direction of packet flow */ 62 uint8_t prefs; /* prefix length in bits for src */ 63 uint8_t prefd; /* prefix length in bits for dst */ 64 }; 65 66 /* Request for IPsec */ 67 struct ipsecrequest { 68 struct secasindex saidx;/* hint for search proper SA */ 69 /* if __ss_len == 0 then no address specified.*/ 70 u_int level; /* IPsec level defined below. */ 71 }; 72 73 /* Security Policy Data Base */ 74 struct secpolicy { 75 TAILQ_ENTRY(secpolicy) chain; 76 LIST_ENTRY(secpolicy) idhash; 77 LIST_ENTRY(secpolicy) drainq; 78 79 struct secpolicyindex spidx; /* selector */ 80 #define IPSEC_MAXREQ 4 81 struct ipsecrequest *req[IPSEC_MAXREQ]; 82 u_int tcount; /* IPsec transforms count */ 83 volatile u_int refcnt; /* reference count */ 84 u_int policy; /* policy_type per pfkeyv2.h */ 85 u_int state; 86 #define IPSEC_SPSTATE_DEAD 0 87 #define IPSEC_SPSTATE_LARVAL 1 88 #define IPSEC_SPSTATE_ALIVE 2 89 #define IPSEC_SPSTATE_PCB 3 90 #define IPSEC_SPSTATE_IFNET 4 91 uint32_t priority; /* priority of this policy */ 92 uint32_t id; /* It's unique number on the system. */ 93 /* 94 * lifetime handler. 95 * the policy can be used without limitiation if both lifetime and 96 * validtime are zero. 97 * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime. 98 * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime. 99 */ 100 time_t created; /* time created the policy */ 101 time_t lastused; /* updated every when kernel sends a packet */ 102 long lifetime; /* duration of the lifetime of this policy */ 103 long validtime; /* duration this policy is valid without use */ 104 }; 105 106 /* 107 * PCB security policies. 108 * Application can setup private security policies for socket. 109 * Such policies can have IPSEC, BYPASS and ENTRUST type. 110 * By default, policies are set to NULL. This means that they have ENTRUST type. 111 * When application sets BYPASS or IPSEC type policy, the flags field 112 * is also updated. When flags is not set, the system could store 113 * used security policy into the sp_in/sp_out pointer to speed up further 114 * lookups. 115 */ 116 struct inpcbpolicy { 117 struct secpolicy *sp_in; 118 struct secpolicy *sp_out; 119 120 uint32_t genid; 121 uint16_t flags; 122 #define INP_INBOUND_POLICY 0x0001 123 #define INP_OUTBOUND_POLICY 0x0002 124 uint16_t hdrsz; 125 }; 126 127 /* SP acquiring list table. */ 128 struct secspacq { 129 LIST_ENTRY(secspacq) chain; 130 131 struct secpolicyindex spidx; 132 133 time_t created; /* for lifetime */ 134 int count; /* for lifetime */ 135 /* XXX: here is mbuf place holder to be sent ? */ 136 }; 137 #endif /* _KERNEL */ 138 139 /* buffer size for formatted output of ipsec address */ 140 #define IPSEC_ADDRSTRLEN (INET6_ADDRSTRLEN + 11) 141 142 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 143 #define IPSEC_PORT_ANY 0 144 #define IPSEC_ULPROTO_ANY 255 145 #define IPSEC_PROTO_ANY 255 146 147 /* mode of security protocol */ 148 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 149 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 150 #define IPSEC_MODE_TRANSPORT 1 151 #define IPSEC_MODE_TUNNEL 2 152 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 153 154 /* 155 * Direction of security policy. 156 * NOTE: Since INVALID is used just as flag. 157 * The other are used for loop counter too. 158 */ 159 #define IPSEC_DIR_ANY 0 160 #define IPSEC_DIR_INBOUND 1 161 #define IPSEC_DIR_OUTBOUND 2 162 #define IPSEC_DIR_MAX 3 163 #define IPSEC_DIR_INVALID 4 164 165 /* Policy level */ 166 /* 167 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 168 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 169 * DISCARD and NONE are allowed for system default. 170 */ 171 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 172 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 173 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 174 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 175 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 176 177 /* Policy scope */ 178 #define IPSEC_POLICYSCOPE_ANY 0x00 /* unspecified */ 179 #define IPSEC_POLICYSCOPE_GLOBAL 0x01 /* global scope */ 180 #define IPSEC_POLICYSCOPE_IFNET 0x02 /* if_ipsec(4) scope */ 181 #define IPSEC_POLICYSCOPE_PCB 0x04 /* PCB scope */ 182 183 /* Security protocol level */ 184 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 185 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 186 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 187 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 188 189 #define IPSEC_MANUAL_REQID_MAX 0x3fff 190 /* 191 * if security policy level == unique, this id 192 * indicate to a relative SA for use, else is 193 * zero. 194 * 1 - 0x3fff are reserved for manual keying. 195 * 0 are reserved for above reason. Others is 196 * for kernel use. 197 * Note that this id doesn't identify SA 198 * by only itself. 199 */ 200 #define IPSEC_REPLAYWSIZE 32 201 202 /* statistics for ipsec processing */ 203 struct ipsecstat { 204 uint64_t ips_in_polvio; /* input: sec policy violation */ 205 uint64_t ips_in_nomem; /* input: no memory available */ 206 uint64_t ips_in_inval; /* input: generic error */ 207 208 uint64_t ips_out_polvio; /* output: sec policy violation */ 209 uint64_t ips_out_nosa; /* output: SA unavailable */ 210 uint64_t ips_out_nomem; /* output: no memory available */ 211 uint64_t ips_out_noroute; /* output: no route available */ 212 uint64_t ips_out_inval; /* output: generic error */ 213 uint64_t ips_out_bundlesa; /* output: bundled SA processed */ 214 215 uint64_t ips_mbcoalesced; /* mbufs coalesced during clone */ 216 uint64_t ips_clcoalesced; /* clusters coalesced during clone */ 217 uint64_t ips_clcopied; /* clusters copied during clone */ 218 uint64_t ips_mbinserted; /* mbufs inserted during makespace */ 219 /* 220 * Temporary statistics for performance analysis. 221 */ 222 /* See where ESP/AH/IPCOMP header land in mbuf on input */ 223 uint64_t ips_input_front; 224 uint64_t ips_input_middle; 225 uint64_t ips_input_end; 226 }; 227 228 /* 229 * Definitions for IPsec & Key sysctl operations. 230 */ 231 #define IPSECCTL_STATS 1 /* stats */ 232 #define IPSECCTL_DEF_POLICY 2 233 #define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 234 #define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 235 #define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 236 #define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 237 #if 0 /* obsolete, do not reuse */ 238 #define IPSECCTL_INBOUND_CALL_IKE 7 239 #endif 240 #define IPSECCTL_AH_CLEARTOS 8 241 #define IPSECCTL_AH_OFFSETMASK 9 242 #define IPSECCTL_DFBIT 10 243 #define IPSECCTL_ECN 11 244 #define IPSECCTL_DEBUG 12 245 #define IPSECCTL_ESP_RANDPAD 13 246 247 #ifdef _KERNEL 248 #include <sys/counter.h> 249 250 struct ipsec_ctx_data; 251 #define IPSEC_INIT_CTX(_ctx, _mp, _inp, _sav, _af, _enc) do { \ 252 (_ctx)->mp = (_mp); \ 253 (_ctx)->inp = (_inp); \ 254 (_ctx)->sav = (_sav); \ 255 (_ctx)->af = (_af); \ 256 (_ctx)->enc = (_enc); \ 257 } while(0) 258 int ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int direction); 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_ipsec_dfbit); 277 VNET_DECLARE(int, ip4_ipsec_ecn); 278 VNET_DECLARE(int, crypto_support); 279 VNET_DECLARE(int, natt_cksum_policy); 280 281 extern struct timeval ipsec_warn_interval; 282 283 #define IPSECSTAT_INC(name) \ 284 VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1) 285 #define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev) 286 #define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev) 287 #define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev) 288 #define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev) 289 #define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit) 290 #define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn) 291 #define V_crypto_support VNET(crypto_support) 292 #define V_natt_cksum_policy VNET(natt_cksum_policy) 293 294 #define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0) 295 /* for openbsd compatibility */ 296 #ifdef IPSEC_DEBUG 297 #define IPSEC_DEBUG_DECLARE(x) x 298 #define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0) 299 #else 300 #define IPSEC_DEBUG_DECLARE(x) 301 #define DPRINTF(x) 302 #endif 303 304 struct inpcb; 305 struct m_tag; 306 struct secasvar; 307 struct sockopt; 308 struct tcphdr; 309 union sockaddr_union; 310 311 int ipsec_if_input(struct mbuf *, struct secasvar *, uint32_t); 312 313 struct ipsecrequest *ipsec_newisr(void); 314 void ipsec_delisr(struct ipsecrequest *); 315 struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *, 316 int *, int); 317 318 u_int ipsec_get_reqlevel(struct secpolicy *, u_int); 319 320 void udp_ipsec_adjust_cksum(struct mbuf *, struct secasvar *, int, int); 321 int udp_ipsec_output(struct mbuf *, struct secasvar *); 322 int udp_ipsec_input(struct mbuf *, int, int); 323 int udp_ipsec_pcbctl(struct inpcb *, struct sockopt *); 324 325 int ipsec_chkreplay(uint32_t, struct secasvar *); 326 int ipsec_updatereplay(uint32_t, struct secasvar *); 327 int ipsec_updateid(struct secasvar *, uint64_t *, uint64_t *); 328 int ipsec_initialized(void); 329 330 void ipsec_setspidx_inpcb(struct inpcb *, struct secpolicyindex *, u_int); 331 332 void ipsec4_setsockaddrs(const struct mbuf *, union sockaddr_union *, 333 union sockaddr_union *); 334 int ipsec4_in_reject(const struct mbuf *, struct inpcb *); 335 int ipsec4_input(struct mbuf *, int, int); 336 int ipsec4_forward(struct mbuf *); 337 int ipsec4_pcbctl(struct inpcb *, struct sockopt *); 338 int ipsec4_output(struct mbuf *, struct inpcb *); 339 int ipsec4_capability(struct mbuf *, u_int); 340 int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, int, int); 341 int ipsec4_process_packet(struct mbuf *, struct secpolicy *, struct inpcb *); 342 int ipsec_process_done(struct mbuf *, struct secpolicy *, struct secasvar *, 343 u_int); 344 345 extern void m_checkalignment(const char* where, struct mbuf *m0, 346 int off, int len); 347 extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 348 extern caddr_t m_pad(struct mbuf *m, int n); 349 extern int m_striphdr(struct mbuf *m, int skip, int hlen); 350 351 #endif /* _KERNEL */ 352 353 #ifndef _KERNEL 354 extern caddr_t ipsec_set_policy(char *, int); 355 extern int ipsec_get_policylen(caddr_t); 356 extern char *ipsec_dump_policy(caddr_t, char *); 357 extern const char *ipsec_strerror(void); 358 359 #endif /* ! KERNEL */ 360 361 #endif /* _NETIPSEC_IPSEC_H_ */ 362