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

     /*      $NetBSD: ipsec.h,v 1.42.14.2 2005/09/03 06:56:04 snj Exp $      */
     /*      $KAME: ipsec.h,v 1.51 2001/08/05 04:52:58 itojun Exp $  */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * IPsec controller part.
     */
    
    #ifndef _NETINET6_IPSEC_H_
    #define _NETINET6_IPSEC_H_
    
    #if defined(_KERNEL_OPT)
    #include "opt_inet.h"
    #endif
    
    #include <net/pfkeyv2.h>
    #include <netkey/keydb.h>
    
    #ifdef _KERNEL
    
    /*
     * Security Policy Index
     * NOTE: Ensure to be same address family and upper layer protocol.
     * NOTE: ul_proto, port number, uid, gid:
     *      ANY: reserved for waldcard.
     *      0 to (~0 - 1): is one of the number of each value.
     */
    struct secpolicyindex {
            struct sockaddr_storage src;    /* IP src address for SP */
            struct sockaddr_storage dst;    /* IP dst address for SP */
            u_int8_t prefs;                 /* prefix length in bits for src */
            u_int8_t prefd;                 /* prefix length in bits for dst */
            u_int16_t ul_proto;             /* upper layer Protocol */
    #ifdef notyet
            uid_t uids;
            uid_t uidd;
            gid_t gids;
            gid_t gidd;
    #endif
    };
    
    /* Security Policy Data Base */
    struct secpolicy {
            TAILQ_ENTRY(secpolicy) tailq;   /* all SPD entries, both pcb/table */
            LIST_ENTRY(secpolicy) chain;    /* SPD entries on table */
    
            u_int8_t dir;                   /* direction of packet flow */
            int readonly;                   /* write prohibited */
            int persist;                    /* will never be removed */
            int refcnt;                     /* reference count */
            struct secpolicyindex *spidx;   /* selector - NULL if not valid */
            u_int16_t tag;                  /* PF tag */
            u_int32_t id;                   /* it identifies a policy in the SPD. */
    #define IPSEC_MANUAL_POLICYID_MAX       0x3fff
                                    /*
                                     * 1 - 0x3fff are reserved for user operation.
                                     * 0 are reserved.  Others are for kernel use.
                                     */
            struct socket *so;              /* backpointer to per-socket policy */
            u_int state;                    /* 0: dead, others: alive */
    #define IPSEC_SPSTATE_DEAD      0
    #define IPSEC_SPSTATE_ALIVE     1
    
            int policy;             /* DISCARD, NONE or IPSEC, see below */
            struct ipsecrequest *req;
                                    /* pointer to the ipsec request tree, */
                                    /* if policy == IPSEC else this value == NULL.*/
    
            /*
             * lifetime handler.
             * the policy can be used without limitiation if both lifetime and
            * validtime are zero.
            * "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
            * "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
            */
           long created;           /* time created the policy */
           long lastused;          /* updated every when kernel sends a packet */
           long lifetime;          /* duration of the lifetime of this policy */
           long validtime;         /* duration this policy is valid without use */
   };
   
   /* Request for IPsec */
   struct ipsecrequest {
           struct ipsecrequest *next;
                                   /* pointer to next structure */
                                   /* If NULL, it means the end of chain. */
           struct secasindex saidx;/* hint for search proper SA */
                                   /* if __ss_len == 0 then no address specified.*/
           u_int level;            /* IPsec level defined below. */
   
           struct secasvar *sav;   /* place holder of SA for use */
           struct secpolicy *sp;   /* back pointer to SP */
   };
   
   /* security policy in PCB */
   struct inpcbpolicy {
           struct secpolicy *sp_in;
           struct secpolicy *sp_out;
           int priv;                       /* privileged socket ? */
   
           /* cached policy */
           struct {
                   struct secpolicy *cachesp;
                   struct secpolicyindex cacheidx;
                   int cachehint;          /* processing requirement hint: */
   #define IPSEC_PCBHINT_MAYBE     0       /* IPsec processing maybe required */
   #define IPSEC_PCBHINT_YES       1       /* IPsec processing is required */
   #define IPSEC_PCBHINT_NO        2       /* IPsec processing not required */
                   u_int cachegen;         /* spdgen when cache filled */
           } sp_cache[3];                  /* XXX 3 == IPSEC_DIR_MAX */
           int sp_cacheflags;
   #define IPSEC_PCBSP_CONNECTED   1
   };
   
   #define IPSEC_PCB_SKIP_IPSEC(inpp, dir)                                 \
           ((inpp)->sp_cache[(dir)].cachehint == IPSEC_PCBHINT_NO &&       \
            (inpp)->sp_cache[(dir)].cachegen == ipsec_spdgen)
   
   /* SP acquiring list table. */
   struct secspacq {
           LIST_ENTRY(secspacq) chain;
   
           struct secpolicyindex spidx;
   
           long created;           /* for lifetime */
           int count;              /* for lifetime */
           /* XXX: here is mbuf place holder to be sent ? */
   };
   
   struct ipsecaux {
           struct socket *so;
           int hdrs;       /* # of ipsec headers */
   
           struct secpolicy *sp;
           struct ipsecrequest *req;
   };
   #endif /* _KERNEL */
   
   /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
   #define IPSEC_PORT_ANY          0
   #define IPSEC_ULPROTO_ANY       255
   #define IPSEC_PROTO_ANY         255
   
   /* mode of security protocol */
   /* NOTE: DON'T use IPSEC_MODE_ANY at SPD.  It's only use in SAD */
   #define IPSEC_MODE_ANY          0       /* i.e. wildcard. */
   #define IPSEC_MODE_TRANSPORT    1
   #define IPSEC_MODE_TUNNEL       2
   
   /*
    * Direction of security policy.
    * NOTE: Since INVALID is used just as flag.
    * The other are used for loop counter too.
    */
   #define IPSEC_DIR_ANY           0
   #define IPSEC_DIR_INBOUND       1
   #define IPSEC_DIR_OUTBOUND      2
   #define IPSEC_DIR_MAX           3
   #define IPSEC_DIR_INVALID       4
   
   /* Policy level */
   /*
    * IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
    * DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
    * DISCARD and NONE are allowed for system default.
    */
   #define IPSEC_POLICY_DISCARD    0       /* discarding packet */
   #define IPSEC_POLICY_NONE       1       /* through IPsec engine */
   #define IPSEC_POLICY_IPSEC      2       /* do IPsec */
   #define IPSEC_POLICY_ENTRUST    3       /* consulting SPD if present. */
   #define IPSEC_POLICY_BYPASS     4       /* only for privileged socket. */
   
   /* Security protocol level */
   #define IPSEC_LEVEL_DEFAULT     0       /* reference to system default */
   #define IPSEC_LEVEL_USE         1       /* use SA if present. */
   #define IPSEC_LEVEL_REQUIRE     2       /* require SA. */
   #define IPSEC_LEVEL_UNIQUE      3       /* unique SA. */
   
   #define IPSEC_MANUAL_REQID_MAX  0x3fff
                                   /*
                                    * if security policy level == unique, this id
                                    * indicate to a relative SA for use, else is
                                    * zero.
                                    * 1 - 0x3fff are reserved for manual keying.
                                    * 0 are reserved for above reason.  Others is
                                    * for kernel use.
                                    * Note that this id doesn't identify SA
                                    * by only itself.
                                    */
   #define IPSEC_REPLAYWSIZE  32
   
   /* statistics for ipsec processing */
   struct ipsecstat {
           u_quad_t in_success;  /* succeeded inbound process */
           u_quad_t in_polvio;
                           /* security policy violation for inbound process */
           u_quad_t in_nosa;     /* inbound SA is unavailable */
           u_quad_t in_inval;    /* inbound processing failed due to EINVAL */
           u_quad_t in_nomem;    /* inbound processing failed due to ENOBUFS */
           u_quad_t in_badspi;   /* failed getting a SPI */
           u_quad_t in_ahreplay; /* AH replay check failed */
           u_quad_t in_espreplay; /* ESP replay check failed */
           u_quad_t in_ahauthsucc; /* AH authentication success */
           u_quad_t in_ahauthfail; /* AH authentication failure */
           u_quad_t in_espauthsucc; /* ESP authentication success */
           u_quad_t in_espauthfail; /* ESP authentication failure */
           u_quad_t in_esphist[256];
           u_quad_t in_ahhist[256];
           u_quad_t in_comphist[256];
           u_quad_t out_success; /* succeeded outbound process */
           u_quad_t out_polvio;
                           /* security policy violation for outbound process */
           u_quad_t out_nosa;    /* outbound SA is unavailable */
           u_quad_t out_inval;   /* outbound process failed due to EINVAL */
           u_quad_t out_nomem;    /* inbound processing failed due to ENOBUFS */
           u_quad_t out_noroute; /* there is no route */
           u_quad_t out_esphist[256];
           u_quad_t out_ahhist[256];
           u_quad_t out_comphist[256];
   
           u_quad_t spdcachelookup;
           u_quad_t spdcachemiss;
   };
   
   /*
    * Definitions for IPsec & Key sysctl operations.
    */
   /*
    * Names for IPsec & Key sysctl objects
    */
   #define IPSECCTL_STATS                  1       /* stats */
   #define IPSECCTL_DEF_POLICY             2
   #define IPSECCTL_DEF_ESP_TRANSLEV       3       /* int; ESP transport mode */
   #define IPSECCTL_DEF_ESP_NETLEV         4       /* int; ESP tunnel mode */
   #define IPSECCTL_DEF_AH_TRANSLEV        5       /* int; AH transport mode */
   #define IPSECCTL_DEF_AH_NETLEV          6       /* int; AH tunnel mode */
   #if 0   /* obsolete, do not reuse */
   #define IPSECCTL_INBOUND_CALL_IKE       7
   #endif
   #define IPSECCTL_AH_CLEARTOS            8
   #define IPSECCTL_AH_OFFSETMASK          9
   #define IPSECCTL_DFBIT                  10
   #define IPSECCTL_ECN                    11
   #define IPSECCTL_DEBUG                  12
   #define IPSECCTL_MAXID                  13
   
   #define IPSECCTL_NAMES { \
           { 0, 0 }, \
           { 0, 0 }, \
           { "def_policy", CTLTYPE_INT }, \
           { "esp_trans_deflev", CTLTYPE_INT }, \
           { "esp_net_deflev", CTLTYPE_INT }, \
           { "ah_trans_deflev", CTLTYPE_INT }, \
           { "ah_net_deflev", CTLTYPE_INT }, \
           { 0, 0 }, \
           { "ah_cleartos", CTLTYPE_INT }, \
           { "ah_offsetmask", CTLTYPE_INT }, \
           { "dfbit", CTLTYPE_INT }, \
           { "ecn", CTLTYPE_INT }, \
           { "debug", CTLTYPE_INT }, \
   }
   
   #define IPSEC6CTL_NAMES { \
           { 0, 0 }, \
           { 0, 0 }, \
           { "def_policy", CTLTYPE_INT }, \
           { "esp_trans_deflev", CTLTYPE_INT }, \
           { "esp_net_deflev", CTLTYPE_INT }, \
           { "ah_trans_deflev", CTLTYPE_INT }, \
           { "ah_net_deflev", CTLTYPE_INT }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "ecn", CTLTYPE_INT }, \
           { "debug", CTLTYPE_INT }, \
   }
   
   #ifdef _KERNEL
   struct ipsec_output_state {
           struct mbuf *m;
           struct route *ro;
           struct sockaddr *dst;
           int encap;
   };
   
   struct ipsec_history {
           int ih_proto;
           u_int32_t ih_spi;
   };
   
   extern int ipsec_debug;
   
   #ifdef INET
   extern struct ipsecstat ipsecstat;
   extern struct secpolicy *ip4_def_policy;
   extern int ip4_esp_trans_deflev;
   extern int ip4_esp_net_deflev;
   extern int ip4_ah_trans_deflev;
   extern int ip4_ah_net_deflev;
   extern int ip4_ah_cleartos;
   extern int ip4_ah_offsetmask;
   extern int ip4_ipsec_dfbit;
   extern int ip4_ipsec_ecn;
   #endif
   
   #ifdef INET6
   extern struct ipsecstat ipsec6stat;
   extern struct secpolicy *ip6_def_policy;
   extern int ip6_esp_trans_deflev;
   extern int ip6_esp_net_deflev;
   extern int ip6_ah_trans_deflev;
   extern int ip6_ah_net_deflev;
   extern int ip6_ipsec_ecn;
   #endif
   
   #define ipseclog(x)     do { if (ipsec_debug) log x; } while (/*CONSTCOND*/ 0)
   
   extern int ipsec_pcbconn __P((struct inpcbpolicy *));
   extern int ipsec_pcbdisconn __P((struct inpcbpolicy *));
   extern void ipsec_invalpcbcacheall __P((void));
   
   extern u_int ipsec_spdgen;
   
   extern struct secpolicy *ipsec4_getpolicybysock
           __P((struct mbuf *, u_int, struct socket *, int *));
   extern struct secpolicy *ipsec4_getpolicybyaddr
           __P((struct mbuf *, u_int, int, int *));
   
   #ifdef INET6
   extern struct secpolicy *ipsec6_getpolicybysock
           __P((struct mbuf *, u_int, struct socket *, int *));
   extern struct secpolicy *ipsec6_getpolicybyaddr
           __P((struct mbuf *, u_int, int, int *));
   #endif /* INET6 */
   
   struct inpcb;
   #ifdef INET6
   struct in6pcb;
   #endif
   extern int ipsec_init_pcbpolicy __P((struct socket *, struct inpcbpolicy **));
   extern int ipsec_copy_pcbpolicy
           __P((struct inpcbpolicy *, struct inpcbpolicy *));
   extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *, int));
   
   extern int ipsec4_set_policy __P((struct inpcb *, int, caddr_t, size_t, int));
   extern int ipsec4_get_policy __P((struct inpcb *, caddr_t, size_t,
               struct mbuf **));
   extern int ipsec4_delete_pcbpolicy __P((struct inpcb *));
   extern int ipsec4_in_reject_so __P((struct mbuf *, struct socket *));
   extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *));
   
   #ifdef INET6
   extern int ipsec6_in_reject_so __P((struct mbuf *, struct socket *));
   extern int ipsec6_delete_pcbpolicy __P((struct in6pcb *));
   extern int ipsec6_set_policy __P((struct in6pcb *, int, caddr_t, size_t, int));
   extern int ipsec6_get_policy __P((struct in6pcb *, caddr_t, size_t,
               struct mbuf **));
   extern int ipsec6_in_reject __P((struct mbuf *, struct in6pcb *));
   #endif /* INET6 */
   
   struct secas;
   struct tcpcb;
   struct tcp6cb;
   extern int ipsec_chkreplay __P((u_int32_t, struct secasvar *));
   extern int ipsec_updatereplay __P((u_int32_t, struct secasvar *));
   
   extern size_t ipsec4_hdrsiz __P((struct mbuf *, u_int, struct inpcb *));
   extern size_t ipsec4_hdrsiz_tcp __P((struct tcpcb *));
   #ifdef INET6
   extern size_t ipsec6_hdrsiz __P((struct mbuf *, u_int, struct in6pcb *));
   extern size_t ipsec6_hdrsiz_tcp __P((struct tcpcb *));
   #endif
   
   struct ip;
   #ifdef INET6
   struct ip6_hdr;
   #endif
   extern const char *ipsec4_logpacketstr __P((struct ip *, u_int32_t));
   #ifdef INET6
   extern const char *ipsec6_logpacketstr __P((struct ip6_hdr *, u_int32_t));
   #endif
   extern const char *ipsec_logsastr __P((struct secasvar *));
   
   extern void ipsec_dumpmbuf __P((struct mbuf *));
   
   extern int ipsec4_output __P((struct ipsec_output_state *, struct secpolicy *,
           int));
   #ifdef INET6
   extern int ipsec6_output_trans __P((struct ipsec_output_state *, u_char *,
           struct mbuf *, struct secpolicy *, int, int *));
   extern int ipsec6_output_tunnel __P((struct ipsec_output_state *,
           struct secpolicy *, int));
   #endif
   extern int ipsec4_tunnel_validate __P((struct ip *, u_int, struct secasvar *));
   #ifdef INET6
   extern int ipsec6_tunnel_validate __P((struct ip6_hdr *, u_int,
           struct secasvar *));
   #endif
   extern struct mbuf *ipsec_copypkt __P((struct mbuf *));
   extern void ipsec_delaux __P((struct mbuf *));
   extern int ipsec_addhist __P((struct mbuf *, int, u_int32_t));
   extern int ipsec_getnhist __P((struct mbuf *));
   extern struct ipsec_history *ipsec_gethist __P((struct mbuf *, int *));
   extern void ipsec_clearhist __P((struct mbuf *));
   
   extern int ipsec_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
   extern int ipsec6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
   
   #endif /* _KERNEL */
   
   #ifndef _KERNEL
   typedef void *ipsec_policy_t;
   extern ipsec_policy_t ipsec_set_policy __P((const char *, int));
   extern int ipsec_get_policylen __P((ipsec_policy_t));
   extern char *ipsec_dump_policy __P((ipsec_policy_t, const char *));
   
   extern const char *ipsec_strerror __P((void));
   #endif /* !_KERNEL */
   
   #endif /* _NETINET6_IPSEC_H_ */

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