1 /* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * IPsec controller part. 36 */ 37 38 #ifndef _NETIPSEC_IPSEC_H_ 39 #define _NETIPSEC_IPSEC_H_ 40 41 #include <net/pfkeyv2.h> 42 #include <netipsec/keydb.h> 43 44 #ifdef _KERNEL 45 46 #include <sys/_lock.h> 47 #include <sys/_mutex.h> 48 #include <sys/_rwlock.h> 49 #include <sys/sysctl.h> 50 51 #include <netinet/in_kdtrace.h> 52 53 #define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m) 54 55 /* 56 * Security Policy Index 57 * Ensure that both address families in the "src" and "dst" are same. 58 * When the value of the ul_proto is ICMPv6, the port field in "src" 59 * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code. 60 */ 61 struct secpolicyindex { 62 union sockaddr_union src; /* IP src address for SP */ 63 union sockaddr_union dst; /* IP dst address for SP */ 64 uint8_t ul_proto; /* upper layer Protocol */ 65 uint8_t dir; /* direction of packet flow */ 66 uint8_t prefs; /* prefix length in bits for src */ 67 uint8_t prefd; /* prefix length in bits for dst */ 68 }; 69 70 /* Request for IPsec */ 71 struct ipsecrequest { 72 struct secasindex saidx;/* hint for search proper SA */ 73 /* if __ss_len == 0 then no address specified.*/ 74 u_int level; /* IPsec level defined below. */ 75 }; 76 77 struct ipsec_accel_adddel_sp_tq { 78 struct vnet *adddel_vnet; 79 struct task adddel_task; 80 int adddel_scheduled; 81 }; 82 83 /* Security Policy Data Base */ 84 struct secpolicy { 85 TAILQ_ENTRY(secpolicy) chain; 86 LIST_ENTRY(secpolicy) idhash; 87 LIST_ENTRY(secpolicy) drainq; 88 89 struct secpolicyindex spidx; /* selector */ 90 #define IPSEC_MAXREQ 4 91 struct ipsecrequest *req[IPSEC_MAXREQ]; 92 u_int tcount; /* IPsec transforms count */ 93 volatile u_int refcnt; /* reference count */ 94 u_int policy; /* policy_type per pfkeyv2.h */ 95 u_int state; 96 #define IPSEC_SPSTATE_DEAD 0 97 #define IPSEC_SPSTATE_LARVAL 1 98 #define IPSEC_SPSTATE_ALIVE 2 99 #define IPSEC_SPSTATE_PCB 3 100 #define IPSEC_SPSTATE_IFNET 4 101 uint32_t priority; /* priority of this policy */ 102 uint32_t id; /* It's unique number on the system. */ 103 /* 104 * lifetime handler. 105 * the policy can be used without limitiation if both lifetime and 106 * validtime are zero. 107 * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime. 108 * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime. 109 */ 110 time_t created; /* time created the policy */ 111 time_t lastused; /* updated every when kernel sends a packet */ 112 long lifetime; /* duration of the lifetime of this policy */ 113 long validtime; /* duration this policy is valid without use */ 114 CK_LIST_HEAD(, ifp_handle_sp) accel_ifps; 115 struct ipsec_accel_adddel_sp_tq accel_add_tq; 116 struct ipsec_accel_adddel_sp_tq accel_del_tq; 117 struct inpcb *ipsec_accel_add_sp_inp; 118 const char *accel_ifname; 119 }; 120 121 /* 122 * PCB security policies. 123 * Application can setup private security policies for socket. 124 * Such policies can have IPSEC, BYPASS and ENTRUST type. 125 * By default, policies are set to NULL. This means that they have ENTRUST type. 126 * When application sets BYPASS or IPSEC type policy, the flags field 127 * is also updated. When flags is not set, the system could store 128 * used security policy into the sp_in/sp_out pointer to speed up further 129 * lookups. 130 */ 131 struct inpcbpolicy { 132 struct secpolicy *sp_in; 133 struct secpolicy *sp_out; 134 135 uint32_t genid; 136 uint16_t flags; 137 #define INP_INBOUND_POLICY 0x0001 138 #define INP_OUTBOUND_POLICY 0x0002 139 uint16_t hdrsz; 140 }; 141 142 /* SP acquiring list table. */ 143 struct 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 /* buffer size for formatted output of ipsec address */ 155 #define IPSEC_ADDRSTRLEN (INET6_ADDRSTRLEN + 11) 156 157 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 158 #define IPSEC_PORT_ANY 0 159 #define IPSEC_ULPROTO_ANY 255 160 #define IPSEC_PROTO_ANY 255 161 162 /* mode of security protocol */ 163 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 164 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 165 #define IPSEC_MODE_TRANSPORT 1 166 #define IPSEC_MODE_TUNNEL 2 167 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 168 169 /* 170 * Direction of security policy. 171 * NOTE: Since INVALID is used just as flag. 172 * The other are used for loop counter too. 173 */ 174 #define IPSEC_DIR_ANY 0 175 #define IPSEC_DIR_INBOUND 1 176 #define IPSEC_DIR_OUTBOUND 2 177 #define IPSEC_DIR_MAX 3 178 #define IPSEC_DIR_INVALID 4 179 180 /* Policy level */ 181 /* 182 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 183 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 184 * DISCARD and NONE are allowed for system default. 185 */ 186 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 187 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 188 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 189 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 190 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 191 192 /* Policy scope */ 193 #define IPSEC_POLICYSCOPE_ANY 0x00 /* unspecified */ 194 #define IPSEC_POLICYSCOPE_GLOBAL 0x01 /* global scope */ 195 #define IPSEC_POLICYSCOPE_IFNET 0x02 /* if_ipsec(4) scope */ 196 #define IPSEC_POLICYSCOPE_PCB 0x04 /* PCB scope */ 197 198 /* Security protocol level */ 199 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 200 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 201 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 202 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 203 204 #define IPSEC_MANUAL_REQID_MAX 0x3fff 205 /* 206 * if security policy level == unique, this id 207 * indicate to a relative SA for use, else is 208 * zero. 209 * 1 - 0x3fff are reserved for manual keying. 210 * 0 are reserved for above reason. Others is 211 * for kernel use. 212 * Note that this id doesn't identify SA 213 * by only itself. 214 */ 215 #define IPSEC_REPLAYWSIZE 32 216 217 /* statistics for ipsec processing */ 218 struct ipsecstat { 219 uint64_t ips_in_polvio; /* input: sec policy violation */ 220 uint64_t ips_in_nomem; /* input: no memory available */ 221 uint64_t ips_in_inval; /* input: generic error */ 222 223 uint64_t ips_out_polvio; /* output: sec policy violation */ 224 uint64_t ips_out_nosa; /* output: SA unavailable */ 225 uint64_t ips_out_nomem; /* output: no memory available */ 226 uint64_t ips_out_noroute; /* output: no route available */ 227 uint64_t ips_out_inval; /* output: generic error */ 228 uint64_t ips_out_bundlesa; /* output: bundled SA processed */ 229 230 uint64_t ips_spdcache_hits; /* SPD cache hits */ 231 uint64_t ips_spdcache_misses; /* SPD cache misses */ 232 233 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 #define IPSECCTL_STATS 1 /* stats */ 248 #define IPSECCTL_DEF_POLICY 2 249 #define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */ 250 #define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */ 251 #define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */ 252 #define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */ 253 #if 0 /* obsolete, do not reuse */ 254 #define IPSECCTL_INBOUND_CALL_IKE 7 255 #endif 256 #define IPSECCTL_AH_CLEARTOS 8 257 #define IPSECCTL_AH_OFFSETMASK 9 258 #define IPSECCTL_DFBIT 10 259 #define IPSECCTL_ECN 11 260 #define IPSECCTL_DEBUG 12 261 #define IPSECCTL_ESP_RANDPAD 13 262 #define IPSECCTL_MIN_PMTU 14 263 264 #ifdef _KERNEL 265 #include <sys/counter.h> 266 267 struct ipsec_ctx_data; 268 #define IPSEC_INIT_CTX(_ctx, _mp, _inp, _sav, _af, _enc) do { \ 269 (_ctx)->mp = (_mp); \ 270 (_ctx)->inp = (_inp); \ 271 (_ctx)->sav = (_sav); \ 272 (_ctx)->af = (_af); \ 273 (_ctx)->enc = (_enc); \ 274 } while(0) 275 int ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int direction); 276 277 VNET_DECLARE(int, ipsec_debug); 278 #define V_ipsec_debug VNET(ipsec_debug) 279 280 #ifdef REGRESSION 281 VNET_DECLARE(int, ipsec_replay); 282 VNET_DECLARE(int, ipsec_integrity); 283 284 #define V_ipsec_replay VNET(ipsec_replay) 285 #define V_ipsec_integrity VNET(ipsec_integrity) 286 #endif 287 288 VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat); 289 VNET_DECLARE(int, ip4_esp_trans_deflev); 290 VNET_DECLARE(int, ip4_esp_net_deflev); 291 VNET_DECLARE(int, ip4_ah_trans_deflev); 292 VNET_DECLARE(int, ip4_ah_net_deflev); 293 VNET_DECLARE(int, ip4_ipsec_dfbit); 294 VNET_DECLARE(int, ip4_ipsec_min_pmtu); 295 VNET_DECLARE(int, ip4_ipsec_ecn); 296 VNET_DECLARE(int, crypto_support); 297 VNET_DECLARE(int, async_crypto); 298 VNET_DECLARE(int, natt_cksum_policy); 299 300 #define IPSECSTAT_INC(name) \ 301 do { \ 302 MIB_SDT_PROBE1(ipsec, count, name, 1); \ 303 VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1); \ 304 } while (0) 305 306 #define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev) 307 #define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev) 308 #define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev) 309 #define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev) 310 #define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit) 311 #define V_ip4_ipsec_min_pmtu VNET(ip4_ipsec_min_pmtu) 312 #define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn) 313 #define V_crypto_support VNET(crypto_support) 314 #define V_async_crypto VNET(async_crypto) 315 #define V_natt_cksum_policy VNET(natt_cksum_policy) 316 317 #define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0) 318 /* for openbsd compatibility */ 319 #ifdef IPSEC_DEBUG 320 #define IPSEC_DEBUG_DECLARE(x) x 321 #define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0) 322 #else 323 #define IPSEC_DEBUG_DECLARE(x) 324 #define DPRINTF(x) 325 #endif 326 327 struct inpcb; 328 struct m_tag; 329 struct secasvar; 330 struct sockopt; 331 struct tcphdr; 332 union sockaddr_union; 333 334 int ipsec_if_input(struct mbuf *, struct secasvar *, uint32_t); 335 336 struct ipsecrequest *ipsec_newisr(void); 337 void ipsec_delisr(struct ipsecrequest *); 338 struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *, 339 int *, int); 340 341 u_int ipsec_get_reqlevel(struct secpolicy *, u_int); 342 343 void udp_ipsec_adjust_cksum(struct mbuf *, struct secasvar *, int, int); 344 int udp_ipsec_output(struct mbuf *, struct secasvar *); 345 346 int ipsec_chkreplay(uint32_t, uint32_t *, struct secasvar *); 347 int ipsec_updatereplay(uint32_t, struct secasvar *); 348 int ipsec_updateid(struct secasvar *, crypto_session_t *, crypto_session_t *); 349 int ipsec_initialized(void); 350 size_t ipsec_hdrsiz_internal(struct secpolicy *); 351 352 void ipsec_setspidx_inpcb(struct inpcb *, struct secpolicyindex *, u_int); 353 354 void ipsec4_setsockaddrs(const struct mbuf *, union sockaddr_union *, 355 union sockaddr_union *); 356 int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, int, int); 357 int ipsec4_check_pmtu(struct ifnet *, struct mbuf *, struct secpolicy *, int); 358 int ipsec4_process_packet(struct ifnet *, struct mbuf *, struct secpolicy *, 359 struct inpcb *, u_long); 360 int ipsec_process_done(struct mbuf *, struct secpolicy *, struct secasvar *, 361 u_int); 362 363 void m_checkalignment(const char* where, struct mbuf *m0, 364 int off, int len); 365 struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off); 366 caddr_t m_pad(struct mbuf *m, int n); 367 int m_striphdr(struct mbuf *m, int skip, int hlen); 368 369 SYSCTL_DECL(_net_inet_ipsec); 370 SYSCTL_DECL(_net_inet6_ipsec6); 371 372 #endif /* _KERNEL */ 373 374 #ifndef _KERNEL 375 caddr_t ipsec_set_policy(const char *, int); 376 int ipsec_get_policylen(c_caddr_t); 377 char *ipsec_dump_policy(c_caddr_t, const char *); 378 const char *ipsec_strerror(void); 379 380 #endif /* ! KERNEL */ 381 382 #endif /* _NETIPSEC_IPSEC_H_ */ 383