1 /* $NetBSD: ipsec.h,v 1.62 2018/01/10 10:56:30 knakahara Exp $ */ 2 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.h,v 1.2.4.2 2004/02/14 22:23:23 bms Exp $ */ 3 /* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */ 4 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 #if defined(_KERNEL_OPT) 42 #include "opt_inet.h" 43 #include "opt_ipsec.h" 44 #endif 45 46 #include <net/pfkeyv2.h> 47 48 #ifdef _KERNEL 49 #include <sys/socketvar.h> 50 #include <sys/localcount.h> 51 52 #include <netinet/in_pcb_hdr.h> 53 #include <netipsec/keydb.h> 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 u_int8_t dir; /* direction of packet flow, see blow */ 63 union sockaddr_union src; /* IP src address for SP */ 64 union sockaddr_union dst; /* IP dst address for SP */ 65 u_int8_t prefs; /* prefix length in bits for src */ 66 u_int8_t prefd; /* prefix length in bits for dst */ 67 u_int16_t ul_proto; /* upper layer Protocol */ 68 #ifdef notyet 69 uid_t uids; 70 uid_t uidd; 71 gid_t gids; 72 gid_t gidd; 73 #endif 74 }; 75 76 /* Security Policy Data Base */ 77 struct secpolicy { 78 struct pslist_entry pslist_entry; 79 80 struct localcount localcount; /* reference count */ 81 struct secpolicyindex spidx; /* selector */ 82 u_int32_t id; /* It's unique number on the system. */ 83 u_int state; /* 0: dead, others: alive */ 84 #define IPSEC_SPSTATE_DEAD 0 85 #define IPSEC_SPSTATE_ALIVE 1 86 87 u_int origin; /* who generate this SP. */ 88 #define IPSEC_SPORIGIN_USER 0 89 #define IPSEC_SPORIGIN_KERNEL 1 90 91 u_int policy; /* DISCARD, NONE or IPSEC, see keyv2.h */ 92 struct ipsecrequest *req; 93 /* pointer to the ipsec request tree, */ 94 /* if policy == IPSEC else this value == NULL.*/ 95 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 time_t lifetime; /* duration of the lifetime of this policy */ 106 time_t 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 secpolicy *sp; /* back pointer to SP */ 119 }; 120 121 /* security policy in PCB */ 122 struct inpcbpolicy { 123 struct secpolicy *sp_in; 124 struct secpolicy *sp_out; 125 int priv; /* privileged socket ? */ 126 127 /* cached policy */ 128 struct { 129 struct secpolicy *cachesp; 130 struct secpolicyindex cacheidx; 131 int cachehint; /* processing requirement hint: */ 132 #define IPSEC_PCBHINT_UNKNOWN 0 /* Unknown */ 133 #define IPSEC_PCBHINT_YES 1 /* IPsec processing is required */ 134 #define IPSEC_PCBHINT_NO 2 /* IPsec processing not required */ 135 u_int cachegen; /* spdgen when cache filled */ 136 } sp_cache[3]; /* XXX 3 == IPSEC_DIR_MAX */ 137 int sp_cacheflags; 138 #define IPSEC_PCBSP_CONNECTED 1 139 struct inpcb_hdr *sp_inph; /* back pointer */ 140 }; 141 142 extern u_int ipsec_spdgen; 143 144 static inline bool 145 ipsec_pcb_skip_ipsec(struct inpcbpolicy *pcbsp, int dir) 146 { 147 148 KASSERT(inph_locked(pcbsp->sp_inph)); 149 150 return pcbsp->sp_cache[(dir)].cachehint == IPSEC_PCBHINT_NO && 151 pcbsp->sp_cache[(dir)].cachegen == ipsec_spdgen; 152 } 153 154 /* SP acquiring list table. */ 155 struct secspacq { 156 LIST_ENTRY(secspacq) chain; 157 158 struct secpolicyindex spidx; 159 160 time_t created; /* for lifetime */ 161 int count; /* for lifetime */ 162 /* XXX: here is mbuf place holder to be sent ? */ 163 }; 164 #endif /* _KERNEL */ 165 166 /* buffer size for formatted output of ipsec address (addr + '%' + scope_id?) */ 167 #define IPSEC_ADDRSTRLEN (INET6_ADDRSTRLEN + 11) 168 /* buffer size for ipsec_logsastr() */ 169 #define IPSEC_LOGSASTRLEN 192 170 171 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */ 172 #define IPSEC_PORT_ANY 0 173 #define IPSEC_ULPROTO_ANY 255 174 #define IPSEC_PROTO_ANY 255 175 176 /* mode of security protocol */ 177 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */ 178 #define IPSEC_MODE_ANY 0 /* i.e. wildcard. */ 179 #define IPSEC_MODE_TRANSPORT 1 180 #define IPSEC_MODE_TUNNEL 2 181 #define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */ 182 183 /* 184 * Direction of security policy. 185 * NOTE: Since INVALID is used just as flag. 186 * The other are used for loop counter too. 187 */ 188 #define IPSEC_DIR_ANY 0 189 #define IPSEC_DIR_INBOUND 1 190 #define IPSEC_DIR_OUTBOUND 2 191 #define IPSEC_DIR_MAX 3 192 #define IPSEC_DIR_INVALID 4 193 194 #define IPSEC_DIR_IS_VALID(dir) ((dir) >= 0 && (dir) <= IPSEC_DIR_MAX) 195 #define IPSEC_DIR_IS_INOROUT(dir) ((dir) == IPSEC_DIR_INBOUND || \ 196 (dir) == IPSEC_DIR_OUTBOUND) 197 198 /* Policy level */ 199 /* 200 * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB, 201 * DISCARD, IPSEC and NONE are allowed for setkey() in SPD. 202 * DISCARD and NONE are allowed for system default. 203 */ 204 #define IPSEC_POLICY_DISCARD 0 /* discarding packet */ 205 #define IPSEC_POLICY_NONE 1 /* through IPsec engine */ 206 #define IPSEC_POLICY_IPSEC 2 /* do IPsec */ 207 #define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */ 208 #define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */ 209 210 /* Security protocol level */ 211 #define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */ 212 #define IPSEC_LEVEL_USE 1 /* use SA if present. */ 213 #define IPSEC_LEVEL_REQUIRE 2 /* require SA. */ 214 #define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */ 215 216 #define IPSEC_MANUAL_REQID_MAX 0x3fff 217 /* 218 * if security policy level == unique, this id 219 * indicate to a relative SA for use, else is 220 * zero. 221 * 1 - 0x3fff are reserved for manual keying. 222 * 0 are reserved for above reason. Others is 223 * for kernel use. 224 * Note that this id doesn't identify SA 225 * by only itself. 226 */ 227 #define IPSEC_REPLAYWSIZE 32 228 229 #ifdef _KERNEL 230 struct ipsec_output_state { 231 struct mbuf *m; 232 struct route *ro; 233 struct sockaddr *dst; 234 }; 235 236 struct ipsec_history { 237 int ih_proto; 238 u_int32_t ih_spi; 239 }; 240 241 extern int ipsec_debug; 242 #ifdef IPSEC_DEBUG 243 extern int ipsec_replay; 244 extern int ipsec_integrity; 245 #endif 246 247 extern struct secpolicy ip4_def_policy; 248 extern int ip4_esp_trans_deflev; 249 extern int ip4_esp_net_deflev; 250 extern int ip4_ah_trans_deflev; 251 extern int ip4_ah_net_deflev; 252 extern int ip4_ah_cleartos; 253 extern int ip4_ah_offsetmask; 254 extern int ip4_ipsec_dfbit; 255 extern int ip4_ipsec_ecn; 256 extern int ip4_esp_randpad; 257 extern int crypto_support; 258 259 #include <sys/syslog.h> 260 #define ipseclog(x) do { if (ipsec_debug) log x; } while (0) 261 /* for openbsd compatibility */ 262 #define DPRINTF(x) do { if (ipsec_debug) printf x; } while (0) 263 264 #define IPSECLOG(level, fmt, args...) \ 265 do { \ 266 if (ipsec_debug) \ 267 log(level, "%s: " fmt, __func__, ##args); \ 268 } while (0) 269 270 void ipsec_pcbconn (struct inpcbpolicy *); 271 void ipsec_pcbdisconn (struct inpcbpolicy *); 272 void ipsec_invalpcbcacheall (void); 273 274 struct inpcb; 275 struct secpolicy *ipsec4_checkpolicy (struct mbuf *, u_int, u_int, 276 int *, struct inpcb *); 277 struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, 278 int, int *); 279 int ipsec4_output(struct mbuf *, struct inpcb *, int, 280 u_long *, bool *, bool *); 281 int ipsec4_input(struct mbuf *, int); 282 int ipsec4_forward(struct mbuf *, int *); 283 #ifdef INET6 284 int ipsec6_input(struct mbuf *); 285 #endif 286 287 static __inline struct secpolicy* 288 ipsec4_getpolicybysock( 289 struct mbuf *m, 290 u_int dir, 291 const struct socket *so, 292 int *err 293 ) 294 { 295 panic("ipsec4_getpolicybysock"); 296 } 297 298 static __inline int 299 ipsec_copy_pcbpolicy( 300 struct inpcbpolicy *oldp, 301 struct inpcbpolicy *newp 302 ) 303 { 304 /*XXX do nothing */ 305 return (0); 306 } 307 308 struct inpcb; 309 #define ipsec_init_pcbpolicy ipsec_init_policy 310 int ipsec_init_policy (struct socket *so, struct inpcbpolicy **); 311 int ipsec_copy_policy 312 (const struct inpcbpolicy *, struct inpcbpolicy *); 313 u_int ipsec_get_reqlevel (const struct ipsecrequest *); 314 int ipsec_in_reject (const struct secpolicy *, const struct mbuf *); 315 316 int ipsec4_set_policy (struct inpcb *, int, const void *, size_t, kauth_cred_t); 317 int ipsec4_get_policy (struct inpcb *, const void *, size_t, struct mbuf **); 318 int ipsec4_delete_pcbpolicy (struct inpcb *); 319 int ipsec4_in_reject (struct mbuf *, struct inpcb *); 320 321 struct secasvar * 322 ipsec_lookup_sa(const struct ipsecrequest *, const struct mbuf *); 323 324 struct secas; 325 struct tcpcb; 326 int ipsec_chkreplay (u_int32_t, const struct secasvar *); 327 int ipsec_updatereplay (u_int32_t, const struct secasvar *); 328 329 size_t ipsec4_hdrsiz (struct mbuf *, u_int, struct inpcb *); 330 size_t ipsec4_hdrsiz_tcp (struct tcpcb *); 331 #define ipsec4_getpolicybyaddr ipsec_getpolicybyaddr 332 333 union sockaddr_union; 334 const char *ipsec_address(const union sockaddr_union* sa, char *, size_t); 335 const char *ipsec_logsastr(const struct secasvar *, char *, size_t); 336 337 void ipsec_dumpmbuf (struct mbuf *); 338 339 /* NetBSD protosw ctlin entrypoint */ 340 void *esp4_ctlinput(int, const struct sockaddr *, void *); 341 void *ah4_ctlinput(int, const struct sockaddr *, void *); 342 343 void ipsec_output_init(void); 344 struct m_tag; 345 void ipsec4_common_input(struct mbuf *m, ...); 346 int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, 347 int, int); 348 int ipsec4_process_packet(struct mbuf *, const struct ipsecrequest *, u_long *); 349 int ipsec_process_done(struct mbuf *, const struct ipsecrequest *, 350 struct secasvar *); 351 #define ipsec_indone(m) \ 352 ((m->m_flags & M_AUTHIPHDR) || (m->m_flags & M_DECRYPTED)) 353 354 #define ipsec_outdone(m) \ 355 (m_tag_find((m), PACKET_TAG_IPSEC_OUT_DONE, NULL) != NULL) 356 357 struct mbuf *ipsec_copypkt (struct mbuf *); 358 359 void m_checkalignment(const char* , struct mbuf *, int, int); 360 struct mbuf *m_clone(struct mbuf *); 361 struct mbuf *m_makespace(struct mbuf *, int, int, int *); 362 void *m_pad(struct mbuf *, int ); 363 int m_striphdr(struct mbuf *, int, int); 364 365 /* Per-socket caching of IPsec output policy */ 366 static __inline 367 int ipsec_clear_socket_cache(struct mbuf *m) 368 { 369 return 0; 370 } 371 372 void nat_t_ports_get(struct mbuf *, u_int16_t *, u_int16_t *); 373 374 extern int ipsec_used __read_mostly, ipsec_enabled __read_mostly; 375 376 #endif /* _KERNEL */ 377 378 #ifndef _KERNEL 379 char *ipsec_set_policy (const char *, int); 380 int ipsec_get_policylen (char *); 381 char *ipsec_dump_policy (char *, const char *); 382 383 const char *ipsec_strerror (void); 384 #endif /* !_KERNEL */ 385 386 #ifdef _KERNEL 387 /* External declarations of per-file init functions */ 388 void ah_attach(void); 389 void esp_attach(void); 390 void ipcomp_attach(void); 391 void ipe4_attach(void); 392 void ipe4_attach(void); 393 void tcpsignature_attach(void); 394 395 void ipsec_attach(void); 396 397 void sysctl_net_inet_ipsec_setup(struct sysctllog **); 398 #ifdef INET6 399 void sysctl_net_inet6_ipsec6_setup(struct sysctllog **); 400 #endif 401 402 #endif /* _KERNEL */ 403 #endif /* !_NETIPSEC_IPSEC_H_ */ 404