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

     /*      $NetBSD: ipsec.h,v 1.7.2.2 2004/05/10 15:06:03 tron Exp $       */
     /*      $FreeBSD: src/sys/netipsec/ipsec.h,v 1.2.4.1 2003/01/24 05:11:35 sam Exp $      */
     /*      $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 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 _NETIPSEC_IPSEC_H_
    #define _NETIPSEC_IPSEC_H_
    
    #if defined(_KERNEL) && !defined(_LKM) && !defined(KLD_MODULE)
    #include "opt_inet.h"
    #include "opt_ipsec.h"
    #endif
    
    #include <net/pfkeyv2.h>
    #include <netipsec/ipsec_osdep.h>
    #include <netipsec/keydb.h>
    
    #ifdef _KERNEL
    
    /*
     * Security Policy Index
     * Ensure that both address families in the "src" and "dst" are same.
     * When the value of the ul_proto is ICMPv6, the port field in "src"
     * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code.
     */
    struct secpolicyindex {
            u_int8_t dir;                   /* direction of packet flow, see blow */
            union sockaddr_union src;       /* IP src address for SP */
            union sockaddr_union 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 {
            LIST_ENTRY(secpolicy) chain;
    
            u_int refcnt;                   /* reference count */
            struct secpolicyindex spidx;    /* selector */
            u_int32_t id;                   /* It's unique number on the system. */
            u_int state;                    /* 0: dead, others: alive */
    #define IPSEC_SPSTATE_DEAD      0
    #define IPSEC_SPSTATE_ALIVE     1
    
            u_int policy;           /* DISCARD, NONE or IPSEC, see keyv2.h */
            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 ? */
   
   #ifdef __NetBSD__
           /* 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
   #endif /* __NetBSD__ */
   };
   
   #ifdef __NetBSD__
   #define IPSEC_PCB_SKIP_IPSEC(inpp, dir)                                 \
           ((inpp)->sp_cache[(dir)].cachehint == IPSEC_PCBHINT_NO &&       \
            (inpp)->sp_cache[(dir)].cachegen == ipsec_spdgen)
   #endif /* __NetBSD__ */
   
   /* 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 ? */
   };
   #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
   
   #ifdef _KERNEL
   struct ipsec_output_state {
           struct mbuf *m;
           struct route *ro;
           struct sockaddr *dst;
   };
   
   struct ipsec_history {
           int ih_proto;
           u_int32_t ih_spi;
   };
   
   extern int ipsec_debug;
   
   extern struct newipsecstat newipsecstat;
   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;
   extern int ip4_esp_randpad;
   extern int crypto_support;
   
   #define ipseclog(x)     do { if (ipsec_debug) log x; } while (0)
   /* for openbsd compatibility */
   #define DPRINTF(x)      do { if (ipsec_debug) printf x; } while (0)
   
   #ifdef __NetBSD__
   extern void ipsec_pcbconn __P((struct inpcbpolicy *));
   extern void ipsec_pcbdisconn __P((struct inpcbpolicy *));
   extern void ipsec_invalpcbcacheall __P((void));
   
   extern u_int ipsec_spdgen;
   #endif /* __NetBSD__ */
   
   struct tdb_ident;
   extern struct secpolicy *ipsec_getpolicy __P((struct tdb_ident*, u_int));
   struct inpcb;
   extern struct secpolicy *ipsec4_checkpolicy __P((struct mbuf *, u_int, u_int,
           int *, struct inpcb *));
   extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int,
           int, int *);
   
   
   static __inline struct secpolicy*
   ipsec4_getpolicybysock(struct mbuf *m, u_int dir, const struct socket *so, int *err)
   {
     panic("ipsec4_getpolicybysock");
   }
   
   static __inline int
   ipsec_copy_pcbpolicy(struct inpcbpolicy *old, struct inpcbpolicy *new)
   {
     /*XXX do nothing */
     return (0);
   }
   
   struct inpcb;
   #define ipsec_init_pcbpolicy ipsec_init_policy
   extern int ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **));
   extern int ipsec_copy_policy
           __P((struct inpcbpolicy *, struct inpcbpolicy *));
   extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *));
   extern int ipsec_in_reject __P((struct secpolicy *, struct mbuf *));
   
   extern int ipsec4_set_policy __P((struct inpcb *inp, int optname,
           caddr_t request, size_t len, int priv));
   extern int ipsec4_get_policy __P((struct inpcb *inpcb, caddr_t request,
           size_t len, struct mbuf **mp));
   extern int ipsec4_delete_pcbpolicy __P((struct inpcb *));
   extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *));
   /*
    * KAME ipsec4_in_reject_so(struct mbuf*, struct so)  compatibility shim
    */
   #define ipsec4_in_reject_so(m, _so) \
     ipsec4_in_reject(m, ((_so) == NULL? NULL : sotoinpcb(_so)))
   
   
   struct secas;
   struct tcpcb;
   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 *));
   #ifdef __FreeBSD__
   extern size_t ipsec_hdrsiz_tcp __P((struct tcpcb *));
   #else
   extern size_t ipsec4_hdrsiz_tcp __P((struct tcpcb *));
   #define ipsec4_getpolicybyaddr ipsec_getpolicybyaddr
   #endif
   
   union sockaddr_union;
   extern char * ipsec_address(union sockaddr_union* sa);
   extern const char *ipsec_logsastr __P((struct secasvar *));
   
   extern void ipsec_dumpmbuf __P((struct mbuf *));
   
   /* NetBSD protosw ctlin entrypoint */
   extern void *esp4_ctlinput __P((int, struct sockaddr *, void *));
   extern void *ah4_ctlinput __P((int, struct sockaddr *, void *));
   
   struct m_tag;
   extern void ipsec4_common_input(struct mbuf *m, ...);
   extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
                           int skip, int protoff, struct m_tag *mt);
   extern int ipsec4_process_packet __P((struct mbuf *, struct ipsecrequest *,
                           int, int));
   extern int ipsec_process_done __P((struct mbuf *, struct ipsecrequest *));
   #define ipsec_indone(m) \
           (m_tag_find((m), PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
   
   extern struct mbuf *ipsec_copypkt __P((struct mbuf *));
   
   extern  void m_checkalignment(const char* where, struct mbuf *m0,
                   int off, int len);
   extern  struct mbuf *m_clone(struct mbuf *m0);
   extern  struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off);
   extern  caddr_t m_pad(struct mbuf *m, int n);
   extern  int m_striphdr(struct mbuf *m, int skip, int hlen);
   
   /* Per-socket caching of IPsec output policy */
   static __inline int ipsec_clear_socket_cache(struct mbuf *m)
   {
     return 0;
   }
   
   
   #endif /* _KERNEL */
   
   #ifndef _KERNEL
   extern caddr_t ipsec_set_policy __P((char *, int));
   extern int ipsec_get_policylen __P((caddr_t));
   extern char *ipsec_dump_policy __P((caddr_t, char *));
   
   extern const char *ipsec_strerror __P((void));
   #endif /* !_KERNEL */
   
   #ifdef _KERNEL
   /* External declarations of per-file init functions */
   INITFN void ah_attach(void);
   INITFN void esp_attach(void);
   INITFN void ipcomp_attach(void);
   INITFN void ipe4_attach(void);
   
   INITFN void ipsec_attach(void);
   #endif /* _KERNEL */
   #endif /* _NETIPSEC_IPSEC_H_ */

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