sys/netinet6/ipsec.h

   1 /*      $FreeBSD: src/sys/netinet6/ipsec.h,v 1.4.2.4 2003/01/23 21:06:47 sam Exp $      */
   2 /*      $DragonFly: src/sys/netinet6/ipsec.h,v 1.5 2006/10/24 06:18:42 hsu 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 _NETINET6_IPSEC_H_
  39 #define _NETINET6_IPSEC_H_
  40
  41 #if defined(_KERNEL) && !defined(_LKM) && !defined(KLD_MODULE)
  42 #include "opt_inet.h"
  43 #include "opt_ipsec.h"
  44 #endif
  45
  46 #include <net/pfkeyv2.h>
  47 #include <netproto/key/keydb.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  */
  57 struct secpolicyindex {
  58         u_int8_t dir;                   /* direction of packet flow, see blow */
  59         struct sockaddr_storage src;    /* IP src address for SP */
  60         struct sockaddr_storage 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 */
  73 struct secpolicy {
  74         LIST_ENTRY(secpolicy) chain;
  75
  76         int refcnt;                     /* reference count */
  77         struct secpolicyindex spidx;    /* selector */
  78         u_int32_t id;                   /* It's unique number on the system. */
  79         u_int state;                    /* 0: dead, others: alive */
  80 #define IPSEC_SPSTATE_DEAD      0
  81 #define IPSEC_SPSTATE_ALIVE     1
  82
  83         u_int policy;           /* DISCARD, NONE or IPSEC, see keyv2.h */
  84         struct ipsecrequest *req;
  85                                 /* pointer to the ipsec request tree, */
  86                                 /* if policy == IPSEC else this value == NULL.*/
  87
  88         /*
  89          * lifetime handler.
  90          * the policy can be used without limitiation if both lifetime and
  91          * validtime are zero.
  92          * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
  93          * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
  94          */
  95         long created;           /* time created the policy */
  96         long lastused;          /* updated every when kernel sends a packet */
  97         long lifetime;          /* duration of the lifetime of this policy */
  98         long validtime;         /* duration this policy is valid without use */
  99 };
 100
 101 /* Request for IPsec */
 102 struct ipsecrequest {
 103         struct ipsecrequest *next;
 104                                 /* pointer to next structure */
 105                                 /* If NULL, it means the end of chain. */
 106         struct secasindex saidx;/* hint for search proper SA */
 107                                 /* if __ss_len == 0 then no address specified.*/
 108         u_int level;            /* IPsec level defined below. */
 109
 110         struct secasvar *sav;   /* place holder of SA for use */
 111         struct secpolicy *sp;   /* back pointer to SP */
 112 };
 113
 114 /* security policy in PCB */
 115 struct inpcbpolicy {
 116         struct secpolicy *sp_in;
 117         struct secpolicy *sp_out;
 118         int priv;                       /* privileged socket ? */
 119 };
 120
 121 /* SP acquiring list table. */
 122 struct secspacq {
 123         LIST_ENTRY(secspacq) chain;
 124
 125         struct secpolicyindex spidx;
 126
 127         long created;           /* for lifetime */
 128         int count;              /* for lifetime */
 129         /* XXX: here is mbuf place holder to be sent ? */
 130 };
 131 #endif /* _KERNEL */
 132
 133 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
 134 #define IPSEC_PORT_ANY          0
 135 #define IPSEC_ULPROTO_ANY       255
 136 #define IPSEC_PROTO_ANY         255
 137
 138 /* mode of security protocol */
 139 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD.  It's only use in SAD */
 140 #define IPSEC_MODE_ANY          0       /* i.e. wildcard. */
 141 #define IPSEC_MODE_TRANSPORT    1
 142 #define IPSEC_MODE_TUNNEL       2
 143 #define IPSEC_MODE_TCPMD5 3  /* TCP MD5 mode */
 144
 145 /*
 146  * Direction of security policy.
 147  * NOTE: Since INVALID is used just as flag.
 148  * The other are used for loop counter too.
 149  */
 150 #define IPSEC_DIR_ANY           0
 151 #define IPSEC_DIR_INBOUND       1
 152 #define IPSEC_DIR_OUTBOUND      2
 153 #define IPSEC_DIR_MAX           3
 154 #define IPSEC_DIR_INVALID       4
 155
 156 /* Policy level */
 157 /*
 158  * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
 159  * DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
 160  * DISCARD and NONE are allowed for system default.
 161  */
 162 #define IPSEC_POLICY_DISCARD    0       /* discard the packet */
 163 #define IPSEC_POLICY_NONE       1       /* bypass IPsec engine */
 164 #define IPSEC_POLICY_IPSEC      2       /* pass to IPsec */
 165 #define IPSEC_POLICY_ENTRUST    3       /* consulting SPD if present. */
 166 #define IPSEC_POLICY_BYPASS     4       /* only for privileged socket. */
 167 #define IPSEC_POLICY_TCP 5 /* TCP MD5 policy */
 168
 169 /* Security protocol level */
 170 #define IPSEC_LEVEL_DEFAULT     0       /* reference to system default */
 171 #define IPSEC_LEVEL_USE         1       /* use SA if present. */
 172 #define IPSEC_LEVEL_REQUIRE     2       /* require SA. */
 173 #define IPSEC_LEVEL_UNIQUE      3       /* unique SA. */
 174
 175 #define IPSEC_MANUAL_REQID_MAX  0x3fff
 176                                 /*
 177                                  * if security policy level == unique, this id
 178                                  * indicate to a relative SA for use, else is
 179                                  * zero.
 180                                  * 1 - 0x3fff are reserved for manual keying.
 181                                  * 0 are reserved for above reason.  Others is
 182                                  * for kernel use.
 183                                  * Note that this id doesn't identify SA
 184                                  * by only itself.
 185                                  */
 186 #define IPSEC_REPLAYWSIZE  32
 187
 188 /* statistics for ipsec processing */
 189 struct ipsecstat {
 190         u_quad_t in_success;  /* succeeded inbound process */
 191         u_quad_t in_polvio;
 192                         /* security policy violation for inbound process */
 193         u_quad_t in_nosa;     /* inbound SA is unavailable */
 194         u_quad_t in_inval;    /* inbound processing failed due to EINVAL */
 195         u_quad_t in_nomem;    /* inbound processing failed due to ENOBUFS */
 196         u_quad_t in_badspi;   /* failed getting a SPI */
 197         u_quad_t in_ahreplay; /* AH replay check failed */
 198         u_quad_t in_espreplay; /* ESP replay check failed */
 199         u_quad_t in_ahauthsucc; /* AH authentication success */
 200         u_quad_t in_ahauthfail; /* AH authentication failure */
 201         u_quad_t in_espauthsucc; /* ESP authentication success */
 202         u_quad_t in_espauthfail; /* ESP authentication failure */
 203         u_quad_t in_esphist[256];
 204         u_quad_t in_ahhist[256];
 205         u_quad_t in_comphist[256];
 206         u_quad_t out_success; /* succeeded outbound process */
 207         u_quad_t out_polvio;
 208                         /* security policy violation for outbound process */
 209         u_quad_t out_nosa;    /* outbound SA is unavailable */
 210         u_quad_t out_inval;   /* outbound process failed due to EINVAL */
 211         u_quad_t out_nomem;    /* inbound processing failed due to ENOBUFS */
 212         u_quad_t out_noroute; /* there is no route */
 213         u_quad_t out_esphist[256];
 214         u_quad_t out_ahhist[256];
 215         u_quad_t out_comphist[256];
 216 };
 217
 218 /*
 219  * Definitions for IPsec & Key sysctl operations.
 220  */
 221 /*
 222  * Names for IPsec & Key sysctl objects
 223  */
 224 #define IPSECCTL_STATS                  1       /* stats */
 225 #define IPSECCTL_DEF_POLICY             2
 226 #define IPSECCTL_DEF_ESP_TRANSLEV       3       /* int; ESP transport mode */
 227 #define IPSECCTL_DEF_ESP_NETLEV         4       /* int; ESP tunnel mode */
 228 #define IPSECCTL_DEF_AH_TRANSLEV        5       /* int; AH transport mode */
 229 #define IPSECCTL_DEF_AH_NETLEV          6       /* int; AH tunnel mode */
 230 #if 0   /* obsolete, do not reuse */
 231 #define IPSECCTL_INBOUND_CALL_IKE       7
 232 #endif
 233 #define IPSECCTL_AH_CLEARTOS            8
 234 #define IPSECCTL_AH_OFFSETMASK          9
 235 #define IPSECCTL_DFBIT                  10
 236 #define IPSECCTL_ECN                    11
 237 #define IPSECCTL_DEBUG                  12
 238 #define IPSECCTL_ESP_RANDPAD            13
 239 #define IPSECCTL_MAXID                  14
 240
 241 #define IPSECCTL_NAMES { \
 242         { 0, 0 }, \
 243         { 0, 0 }, \
 244         { "def_policy", CTLTYPE_INT }, \
 245         { "esp_trans_deflev", CTLTYPE_INT }, \
 246         { "esp_net_deflev", CTLTYPE_INT }, \
 247         { "ah_trans_deflev", CTLTYPE_INT }, \
 248         { "ah_net_deflev", CTLTYPE_INT }, \
 249         { 0, 0 }, \
 250         { "ah_cleartos", CTLTYPE_INT }, \
 251         { "ah_offsetmask", CTLTYPE_INT }, \
 252         { "dfbit", CTLTYPE_INT }, \
 253         { "ecn", CTLTYPE_INT }, \
 254         { "debug", CTLTYPE_INT }, \
 255         { "esp_randpad", CTLTYPE_INT }, \
 256 }
 257
 258 #define IPSEC6CTL_NAMES { \
 259         { 0, 0 }, \
 260         { 0, 0 }, \
 261         { "def_policy", CTLTYPE_INT }, \
 262         { "esp_trans_deflev", CTLTYPE_INT }, \
 263         { "esp_net_deflev", CTLTYPE_INT }, \
 264         { "ah_trans_deflev", CTLTYPE_INT }, \
 265         { "ah_net_deflev", CTLTYPE_INT }, \
 266         { 0, 0 }, \
 267         { 0, 0 }, \
 268         { 0, 0 }, \
 269         { 0, 0 }, \
 270         { "ecn", CTLTYPE_INT }, \
 271         { "debug", CTLTYPE_INT }, \
 272         { "esp_randpad", CTLTYPE_INT }, \
 273 }
 274
 275 #ifdef _KERNEL
 276 struct ipsec_output_state {
 277         struct mbuf *m;
 278         struct route *ro;
 279         struct sockaddr *dst;
 280 };
 281
 282 struct ipsec_history {
 283         int ih_proto;
 284         u_int32_t ih_spi;
 285 };
 286
 287 extern int ipsec_debug;
 288
 289 extern struct ipsecstat ipsecstat;
 290 extern struct secpolicy ip4_def_policy;
 291 extern int ip4_esp_trans_deflev;
 292 extern int ip4_esp_net_deflev;
 293 extern int ip4_ah_trans_deflev;
 294 extern int ip4_ah_net_deflev;
 295 extern int ip4_ah_cleartos;
 296 extern int ip4_ah_offsetmask;
 297 extern int ip4_ipsec_dfbit;
 298 extern int ip4_ipsec_ecn;
 299 extern int ip4_esp_randpad;
 300
 301 #define ipseclog(x)     do { if (ipsec_debug) log x; } while (0)
 302
 303 extern struct secpolicy *ipsec4_getpolicybysock
 304         (struct mbuf *, u_int, struct socket *, int *);
 305 extern struct secpolicy *ipsec4_getpolicybyaddr
 306         (struct mbuf *, u_int, int, int *);
 307
 308 struct inpcb;
 309 extern int ipsec_init_policy (struct socket *, struct inpcbpolicy **);
 310 extern int ipsec_copy_policy
 311         (struct inpcbpolicy *, struct inpcbpolicy *);
 312 extern u_int ipsec_get_reqlevel (struct ipsecrequest *);
 313
 314 extern int ipsec4_set_policy (struct inpcb *, int, caddr_t, size_t, int);
 315 extern int ipsec4_get_policy (struct inpcb *, caddr_t, size_t, struct mbuf **);
 316 extern int ipsec4_delete_pcbpolicy (struct inpcb *);
 317 extern int ipsec4_in_reject_so (struct mbuf *, struct socket *);
 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 ipsec4_hdrsiz (struct mbuf *, u_int, struct inpcb *);
 326 extern size_t ipsec_hdrsiz_tcp (struct tcpcb *);
 327
 328 struct ip;
 329 extern const char *ipsec4_logpacketstr (struct ip *, u_int32_t);
 330 extern const char *ipsec_logsastr (struct secasvar *);
 331
 332 extern void ipsec_dumpmbuf (struct mbuf *);
 333
 334 extern int ipsec4_output (struct ipsec_output_state *, struct secpolicy *,
 335         int);
 336 extern int ipsec4_tunnel_validate (struct mbuf *, int, u_int,
 337         struct secasvar *);
 338 extern struct mbuf *ipsec_copypkt (struct mbuf *);
 339 extern void ipsec_delaux (struct mbuf *);
 340 extern int ipsec_addhist (struct mbuf *, int, u_int32_t);
 341 extern struct ipsec_history *ipsec_gethist (struct mbuf *, int *);
 342 #endif /* _KERNEL */
 343
 344 #ifndef _KERNEL
 345 extern caddr_t ipsec_set_policy (char *, int);
 346 extern int ipsec_get_policylen (caddr_t);
 347 extern char *ipsec_dump_policy (caddr_t, char *);
 348
 349 extern const char *ipsec_strerror (void);
 350 #endif /* !_KERNEL */
 351
 352 #endif /* _NETINET6_IPSEC_H_ */