The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ipsec.h

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    1 /*      $NetBSD: ipsec.h,v 1.51 2009/05/06 21:41:59 elad Exp $  */
    2 /*      $KAME: ipsec.h,v 1.51 2001/08/05 04:52:58 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 _NETINET6_IPSEC_H_
   38 #define _NETINET6_IPSEC_H_
   39 
   40 #if defined(_KERNEL_OPT)
   41 #include "opt_inet.h"
   42 #endif
   43 
   44 #include <net/pfkeyv2.h>
   45 #include <netkey/keydb.h>
   46 
   47 #ifdef _KERNEL
   48 
   49 /*
   50  * Security Policy Index
   51  * NOTE: Ensure to be same address family and upper layer protocol.
   52  * NOTE: ul_proto, port number, uid, gid:
   53  *      ANY: reserved for waldcard.
   54  *      0 to (~0 - 1): is one of the number of each value.
   55  */
   56 struct secpolicyindex {
   57         struct sockaddr_storage src;    /* IP src address for SP */
   58         struct sockaddr_storage dst;    /* IP dst address for SP */
   59         u_int8_t prefs;                 /* prefix length in bits for src */
   60         u_int8_t prefd;                 /* prefix length in bits for dst */
   61         u_int16_t ul_proto;             /* upper layer Protocol */
   62 #ifdef notyet
   63         uid_t uids;
   64         uid_t uidd;
   65         gid_t gids;
   66         gid_t gidd;
   67 #endif
   68 };
   69 
   70 /* Security Policy Data Base */
   71 struct secpolicy {
   72         TAILQ_ENTRY(secpolicy) tailq;   /* all SPD entries, both pcb/table */
   73         LIST_ENTRY(secpolicy) chain;    /* SPD entries on table */
   74 
   75         u_int8_t dir;                   /* direction of packet flow */
   76         int readonly;                   /* write prohibited */
   77         int persist;                    /* will never be removed */
   78         int refcnt;                     /* reference count */
   79         struct secpolicyindex *spidx;   /* selector - NULL if not valid */
   80         u_int16_t tag;                  /* PF tag */
   81         u_int32_t id;                   /* it identifies a policy in the SPD. */
   82 #define IPSEC_MANUAL_POLICYID_MAX       0x3fff
   83                                 /*
   84                                  * 1 - 0x3fff are reserved for user operation.
   85                                  * 0 are reserved.  Others are for kernel use.
   86                                  */
   87         struct socket *so;              /* backpointer to per-socket policy */
   88         u_int state;                    /* 0: dead, others: alive */
   89 #define IPSEC_SPSTATE_DEAD      0
   90 #define IPSEC_SPSTATE_ALIVE     1
   91 
   92         int policy;             /* DISCARD, NONE or IPSEC, see below */
   93         struct ipsecrequest *req;
   94                                 /* pointer to the ipsec request tree, */
   95                                 /* if policy == IPSEC else this value == NULL.*/
   96 
   97         /*
   98          * lifetime handler.
   99          * the policy can be used without limitiation if both lifetime and
  100          * validtime are zero.
  101          * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
  102          * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
  103          */
  104         time_t created;         /* time created the policy */
  105         time_t lastused;        /* updated every when kernel sends a packet */
  106         long lifetime;          /* duration of the lifetime of this policy */
  107         long validtime;         /* duration this policy is valid without use */
  108 };
  109 
  110 /* Request for IPsec */
  111 struct ipsecrequest {
  112         struct ipsecrequest *next;
  113                                 /* pointer to next structure */
  114                                 /* If NULL, it means the end of chain. */
  115         struct secasindex saidx;/* hint for search proper SA */
  116                                 /* if __ss_len == 0 then no address specified.*/
  117         u_int level;            /* IPsec level defined below. */
  118 
  119         struct secasvar *sav;   /* place holder of SA for use */
  120         struct secpolicy *sp;   /* back pointer to SP */
  121 };
  122 
  123 /* security policy in PCB */
  124 struct inpcbpolicy {
  125         struct secpolicy *sp_in;
  126         struct secpolicy *sp_out;
  127         int priv;                       /* privileged socket ? */
  128 
  129         /* cached policy */
  130         struct {
  131                 struct secpolicy *cachesp;
  132                 struct secpolicyindex cacheidx;
  133                 int cachehint;          /* processing requirement hint: */
  134 #define IPSEC_PCBHINT_MAYBE     0       /* IPsec processing maybe required */
  135 #define IPSEC_PCBHINT_YES       1       /* IPsec processing is required */
  136 #define IPSEC_PCBHINT_NO        2       /* IPsec processing not required */
  137                 u_int cachegen;         /* spdgen when cache filled */
  138         } sp_cache[3];                  /* XXX 3 == IPSEC_DIR_MAX */
  139         int sp_cacheflags;
  140 #define IPSEC_PCBSP_CONNECTED   1
  141 };
  142 
  143 #define IPSEC_PCB_SKIP_IPSEC(inpp, dir)                                 \
  144         ((inpp)->sp_cache[(dir)].cachehint == IPSEC_PCBHINT_NO &&       \
  145          (inpp)->sp_cache[(dir)].cachegen == ipsec_spdgen)
  146 
  147 /* SP acquiring list table. */
  148 struct secspacq {
  149         LIST_ENTRY(secspacq) chain;
  150 
  151         struct secpolicyindex spidx;
  152 
  153         long created;           /* for lifetime */
  154         int count;              /* for lifetime */
  155         /* XXX: here is mbuf place holder to be sent ? */
  156 };
  157 
  158 struct ipsecaux {
  159         struct socket *so;
  160         int hdrs;       /* # of ipsec headers */
  161 
  162         struct secpolicy *sp;
  163         struct ipsecrequest *req;
  164 };
  165 #endif /* _KERNEL */
  166 
  167 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
  168 #define IPSEC_PORT_ANY          0
  169 #define IPSEC_ULPROTO_ANY       255
  170 #define IPSEC_PROTO_ANY         255
  171 
  172 /* mode of security protocol */
  173 /* NOTE: DON'T use IPSEC_MODE_ANY at SPD.  It's only use in SAD */
  174 #define IPSEC_MODE_ANY          0       /* i.e. wildcard. */
  175 #define IPSEC_MODE_TRANSPORT    1
  176 #define IPSEC_MODE_TUNNEL       2
  177 
  178 /*
  179  * Direction of security policy.
  180  * NOTE: Since INVALID is used just as flag.
  181  * The other are used for loop counter too.
  182  */
  183 #define IPSEC_DIR_ANY           0
  184 #define IPSEC_DIR_INBOUND       1
  185 #define IPSEC_DIR_OUTBOUND      2
  186 #define IPSEC_DIR_MAX           3
  187 #define IPSEC_DIR_INVALID       4
  188 
  189 /* Policy level */
  190 /*
  191  * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
  192  * DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
  193  * DISCARD and NONE are allowed for system default.
  194  */
  195 #define IPSEC_POLICY_DISCARD    0       /* discarding packet */
  196 #define IPSEC_POLICY_NONE       1       /* through IPsec engine */
  197 #define IPSEC_POLICY_IPSEC      2       /* do IPsec */
  198 #define IPSEC_POLICY_ENTRUST    3       /* consulting SPD if present. */
  199 #define IPSEC_POLICY_BYPASS     4       /* only for privileged socket. */
  200 
  201 /* Security protocol level */
  202 #define IPSEC_LEVEL_DEFAULT     0       /* reference to system default */
  203 #define IPSEC_LEVEL_USE         1       /* use SA if present. */
  204 #define IPSEC_LEVEL_REQUIRE     2       /* require SA. */
  205 #define IPSEC_LEVEL_UNIQUE      3       /* unique SA. */
  206 
  207 #define IPSEC_MANUAL_REQID_MAX  0x3fff
  208                                 /*
  209                                  * if security policy level == unique, this id
  210                                  * indicate to a relative SA for use, else is
  211                                  * zero.
  212                                  * 1 - 0x3fff are reserved for manual keying.
  213                                  * 0 are reserved for above reason.  Others is
  214                                  * for kernel use.
  215                                  * Note that this id doesn't identify SA
  216                                  * by only itself.
  217                                  */
  218 #define IPSEC_REPLAYWSIZE  32
  219 
  220 /*
  221  * statistics for ipsec processing.
  222  * Each counter is an unsigned 64-bit value.
  223  */
  224 #define IPSEC_STAT_IN_SUCCESS   0       /* succeeded inbound process */
  225 #define IPSEC_STAT_IN_POLVIO    1       /* security policy violation for
  226                                            inbound process */
  227 #define IPSEC_STAT_IN_NOSA      2       /* inbound SA is unavailable */
  228 #define IPSEC_STAT_IN_INVAL     3       /* inbound processing failed EINVAL */
  229 #define IPSEC_STAT_IN_NOMEM     4       /* inbound processing failed ENOBUFS */
  230 #define IPSEC_STAT_IN_BADSPI    5       /* failed getting an SPI */
  231 #define IPSEC_STAT_IN_AHREPLAY  6       /* AH replay check failed */
  232 #define IPSEC_STAT_IN_ESPREPLAY 7       /* ESP replay check failed */
  233 #define IPSEC_STAT_IN_AHAUTHSUCC 8      /* AH authentication success */
  234 #define IPSEC_STAT_IN_AHAUTHFAIL 9      /* AH authentication failure */
  235 #define IPSEC_STAT_IN_ESPAUTHSUCC 10    /* ESP authentication success */
  236 #define IPSEC_STAT_IN_ESPAUTHFAIL 11    /* ESP authentication failure */
  237 #define IPSEC_STAT_IN_ESPHIST   12
  238                 /* space for 256 counters */
  239 #define IPSEC_STAT_IN_AHHIST    268
  240                 /* space for 256 counters */
  241 #define IPSEC_STAT_IN_COMPHIST  524
  242                 /* space for 256 counters */
  243 #define IPSEC_STAT_OUT_SUCCESS  780     /* succeeded outbound process */
  244 #define IPSEC_STAT_OUT_POLVIO   781     /* security policy violation for
  245                                            outbound process */
  246 #define IPSEC_STAT_OUT_NOSA     782     /* outbound SA is unavailable */
  247 #define IPSEC_STAT_OUT_INVAL    783     /* outbound processing failed EINVAL */
  248 #define IPSEC_STAT_OUT_NOMEM    784     /* outbound processing failed ENOBUFS */
  249 #define IPSEC_STAT_OUT_NOROUTE  785     /* no route */
  250 #define IPSEC_STAT_OUT_ESPHIST  786
  251                 /* space for 256 counters */
  252 #define IPSEC_STAT_OUT_AHHIST   1042
  253                 /* space for 256 counters */
  254 #define IPSEC_STAT_OUT_COMPHIST 1298
  255                 /* space for 256 counters */
  256 #define IPSEC_STAT_SPDCACHELOOKUP 1554
  257 #define IPSEC_STAT_SPDCACHEMISS 1555
  258 
  259 #define IPSEC_NSTATS            1556
  260 
  261 /*
  262  * Definitions for IPsec & Key sysctl operations.
  263  */
  264 /*
  265  * Names for IPsec & Key sysctl objects
  266  */
  267 #define IPSECCTL_STATS                  1       /* stats */
  268 #define IPSECCTL_DEF_POLICY             2
  269 #define IPSECCTL_DEF_ESP_TRANSLEV       3       /* int; ESP transport mode */
  270 #define IPSECCTL_DEF_ESP_NETLEV         4       /* int; ESP tunnel mode */
  271 #define IPSECCTL_DEF_AH_TRANSLEV        5       /* int; AH transport mode */
  272 #define IPSECCTL_DEF_AH_NETLEV          6       /* int; AH tunnel mode */
  273 #if 0   /* obsolete, do not reuse */
  274 #define IPSECCTL_INBOUND_CALL_IKE       7
  275 #endif
  276 #define IPSECCTL_AH_CLEARTOS            8
  277 #define IPSECCTL_AH_OFFSETMASK          9
  278 #define IPSECCTL_DFBIT                  10
  279 #define IPSECCTL_ECN                    11
  280 #define IPSECCTL_DEBUG                  12
  281 #define IPSECCTL_MAXID                  13
  282 
  283 #define IPSECCTL_NAMES { \
  284         { 0, 0 }, \
  285         { 0, 0 }, \
  286         { "def_policy", CTLTYPE_INT }, \
  287         { "esp_trans_deflev", CTLTYPE_INT }, \
  288         { "esp_net_deflev", CTLTYPE_INT }, \
  289         { "ah_trans_deflev", CTLTYPE_INT }, \
  290         { "ah_net_deflev", CTLTYPE_INT }, \
  291         { 0, 0 }, \
  292         { "ah_cleartos", CTLTYPE_INT }, \
  293         { "ah_offsetmask", CTLTYPE_INT }, \
  294         { "dfbit", CTLTYPE_INT }, \
  295         { "ecn", CTLTYPE_INT }, \
  296         { "debug", CTLTYPE_INT }, \
  297 }
  298 
  299 #define IPSEC6CTL_NAMES { \
  300         { 0, 0 }, \
  301         { 0, 0 }, \
  302         { "def_policy", CTLTYPE_INT }, \
  303         { "esp_trans_deflev", CTLTYPE_INT }, \
  304         { "esp_net_deflev", CTLTYPE_INT }, \
  305         { "ah_trans_deflev", CTLTYPE_INT }, \
  306         { "ah_net_deflev", CTLTYPE_INT }, \
  307         { 0, 0 }, \
  308         { 0, 0 }, \
  309         { 0, 0 }, \
  310         { 0, 0 }, \
  311         { "ecn", CTLTYPE_INT }, \
  312         { "debug", CTLTYPE_INT }, \
  313 }
  314 
  315 #ifdef _KERNEL
  316 struct ipsec_output_state {
  317         struct mbuf *m;
  318         struct route *ro;
  319         const struct sockaddr *dst;
  320         int encap;
  321 };
  322 
  323 struct ipsec_history {
  324         int ih_proto;
  325         u_int32_t ih_spi;
  326 };
  327 
  328 extern int ipsec_debug;
  329 
  330 #ifdef INET
  331 extern struct secpolicy *ip4_def_policy;
  332 extern int ip4_esp_trans_deflev;
  333 extern int ip4_esp_net_deflev;
  334 extern int ip4_ah_trans_deflev;
  335 extern int ip4_ah_net_deflev;
  336 extern int ip4_ah_cleartos;
  337 extern int ip4_ah_offsetmask;
  338 extern int ip4_ipsec_dfbit;
  339 extern int ip4_ipsec_ecn;
  340 #endif
  341 
  342 #ifdef INET6
  343 extern struct secpolicy *ip6_def_policy;
  344 extern int ip6_esp_trans_deflev;
  345 extern int ip6_esp_net_deflev;
  346 extern int ip6_ah_trans_deflev;
  347 extern int ip6_ah_net_deflev;
  348 extern int ip6_ipsec_ecn;
  349 #endif
  350 
  351 #define ipseclog(x)     do { if (ipsec_debug) log x; } while (/*CONSTCOND*/ 0)
  352 
  353 extern int ipsec_pcbconn(struct inpcbpolicy *);
  354 extern int ipsec_pcbdisconn(struct inpcbpolicy *);
  355 extern void ipsec_invalpcbcacheall(void);
  356 
  357 extern u_int ipsec_spdgen;
  358 
  359 extern struct secpolicy *ipsec4_getpolicybysock
  360 (struct mbuf *, u_int, struct socket *, int *);
  361 extern struct secpolicy *ipsec4_getpolicybyaddr
  362 (struct mbuf *, u_int, int, int *);
  363 
  364 #ifdef INET6
  365 extern struct secpolicy *ipsec6_getpolicybysock
  366 (struct mbuf *, u_int, struct socket *, int *);
  367 extern struct secpolicy *ipsec6_getpolicybyaddr
  368 (struct mbuf *, u_int, int, int *);
  369 #endif /* INET6 */
  370 
  371 struct inpcb;
  372 #ifdef INET6
  373 struct in6pcb;
  374 #endif
  375 extern int ipsec_init_pcbpolicy(struct socket *, struct inpcbpolicy **);
  376 extern int ipsec_copy_pcbpolicy
  377 (struct inpcbpolicy *, struct inpcbpolicy *);
  378 extern u_int ipsec_get_reqlevel(struct ipsecrequest *, int);
  379 
  380 extern int ipsec4_set_policy(struct inpcb *, int, void *, size_t, kauth_cred_t);
  381 extern int ipsec4_get_policy(struct inpcb *, void *, size_t,
  382             struct mbuf **);
  383 extern int ipsec4_delete_pcbpolicy(struct inpcb *);
  384 extern int ipsec4_in_reject_so(struct mbuf *, struct socket *);
  385 extern int ipsec4_in_reject(struct mbuf *, struct inpcb *);
  386 
  387 #ifdef INET6
  388 extern int ipsec6_in_reject_so(struct mbuf *, struct socket *);
  389 extern int ipsec6_delete_pcbpolicy(struct in6pcb *);
  390 extern int ipsec6_set_policy(struct in6pcb *, int, void *, size_t,
  391     kauth_cred_t);
  392 extern int ipsec6_get_policy(struct in6pcb *, void *, size_t,
  393             struct mbuf **);
  394 extern int ipsec6_in_reject(struct mbuf *, struct in6pcb *);
  395 #endif /* INET6 */
  396 
  397 struct secas;
  398 struct tcpcb;
  399 struct tcp6cb;
  400 extern int ipsec_chkreplay(u_int32_t, struct secasvar *);
  401 extern int ipsec_updatereplay(u_int32_t, struct secasvar *);
  402 
  403 extern void ipsec4_init(void);
  404 extern size_t ipsec4_hdrsiz(struct mbuf *, u_int, struct inpcb *);
  405 extern size_t ipsec4_hdrsiz_tcp(struct tcpcb *);
  406 #ifdef INET6
  407 extern void ipsec6_init(void);
  408 extern size_t ipsec6_hdrsiz(struct mbuf *, u_int, struct in6pcb *);
  409 extern size_t ipsec6_hdrsiz_tcp(struct tcpcb *);
  410 #endif
  411 
  412 struct ip;
  413 #ifdef INET6
  414 struct ip6_hdr;
  415 #endif
  416 extern const char *ipsec4_logpacketstr(struct ip *, u_int32_t);
  417 #ifdef INET6
  418 extern const char *ipsec6_logpacketstr(struct ip6_hdr *, u_int32_t);
  419 #endif
  420 extern const char *ipsec_logsastr(struct secasvar *);
  421 
  422 extern void ipsec_dumpmbuf(struct mbuf *);
  423 
  424 extern int ipsec4_output(struct ipsec_output_state *, struct secpolicy *,
  425         int);
  426 #ifdef INET6
  427 extern int ipsec6_output_trans(struct ipsec_output_state *, u_char *,
  428         struct mbuf *, struct secpolicy *, int, int *);
  429 extern int ipsec6_output_tunnel(struct ipsec_output_state *,
  430         struct secpolicy *, int);
  431 #endif
  432 extern int ipsec4_tunnel_validate(struct ip *, u_int, struct secasvar *);
  433 #ifdef INET6
  434 extern int ipsec6_tunnel_validate(struct ip6_hdr *, u_int,
  435         struct secasvar *);
  436 #endif
  437 extern struct mbuf *ipsec_copypkt(struct mbuf *);
  438 extern void ipsec_delaux(struct mbuf *);
  439 extern int ipsec_addhist(struct mbuf *, int, u_int32_t);
  440 extern int ipsec_getnhist(struct mbuf *);
  441 extern struct ipsec_history *ipsec_gethist(struct mbuf *, int *);
  442 extern void ipsec_clearhist(struct mbuf *);
  443 
  444 extern int ipsec_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  445 extern int ipsec6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  446 
  447 #endif /* _KERNEL */
  448 
  449 #ifndef _KERNEL
  450 typedef void *ipsec_policy_t;
  451 extern ipsec_policy_t ipsec_set_policy(const char *, int);
  452 extern int ipsec_get_policylen(ipsec_policy_t);
  453 extern char *ipsec_dump_policy(ipsec_policy_t, const char *);
  454 
  455 extern const char *ipsec_strerror(void);
  456 #endif /* !_KERNEL */
  457 
  458 #endif /* !_NETINET6_IPSEC_H_ */

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