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

     /*      $FreeBSD: releng/11.2/sys/netipsec/keydb.h 331722 2018-03-29 02:50:57Z eadler $ */
     /*      $KAME: keydb.h,v 1.14 2000/08/02 17:58:26 sakane 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.
     */
    
    #ifndef _NETIPSEC_KEYDB_H_
    #define _NETIPSEC_KEYDB_H_
    
    #ifdef _KERNEL
    #include <sys/counter.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    #include <netipsec/key_var.h>
    
    #ifndef _SOCKADDR_UNION_DEFINED
    #define _SOCKADDR_UNION_DEFINED
    /*
     * The union of all possible address formats we handle.
     */
    union sockaddr_union {
            struct sockaddr         sa;
            struct sockaddr_in      sin;
            struct sockaddr_in6     sin6;
    };
    #endif /* _SOCKADDR_UNION_DEFINED */
    
    /* Security Assocciation Index */
    /* NOTE: Ensure to be same address family */
    struct secasindex {
            union sockaddr_union src;       /* source address for SA */
            union sockaddr_union dst;       /* destination address for SA */
            uint8_t proto;                  /* IPPROTO_ESP or IPPROTO_AH */
            uint8_t mode;                   /* mode of protocol, see ipsec.h */
            uint32_t reqid;                 /* reqid id who owned this SA */
                                            /* see IPSEC_MANUAL_REQID_MAX. */
    };
    
    /* 
     * In order to split out the keydb implementation from that of the
     * PF_KEY sockets we need to define a few structures that while they
     * may seem common are likely to diverge over time. 
     */
    
    /* sadb_identity */
    struct secident {
            u_int16_t type;
            u_int64_t id;
    };
    
    /* sadb_key */
    struct seckey {
            u_int16_t bits;
            char *key_data;
    };
    
    struct seclifetime {
            u_int32_t allocations;
            u_int64_t bytes;
            u_int64_t addtime;
            u_int64_t usetime;
    };
    
    struct secnatt {
            union sockaddr_union oai;       /* original addresses of initiator */
            union sockaddr_union oar;       /* original address of responder */
            uint16_t sport;                 /* source port */
            uint16_t dport;                 /* destination port */
            uint16_t cksum;                 /* checksum delta */
            uint16_t flags;
    #define IPSEC_NATT_F_OAI        0x0001
    #define IPSEC_NATT_F_OAR        0x0002
   };
   
   /* Security Association Data Base */
   TAILQ_HEAD(secasvar_queue, secasvar);
   struct secashead {
           TAILQ_ENTRY(secashead) chain;
           LIST_ENTRY(secashead) addrhash; /* hash by sproto+src+dst addresses */
           LIST_ENTRY(secashead) drainq;   /* used ONLY by flush callout */
   
           struct secasindex saidx;
   
           struct secident *idents;        /* source identity */
           struct secident *identd;        /* destination identity */
                                           /* XXX I don't know how to use them. */
   
           volatile u_int refcnt;          /* reference count */
           uint8_t state;                  /* MATURE or DEAD. */
           struct secasvar_queue savtree_alive;    /* MATURE and DYING SA */
           struct secasvar_queue savtree_larval;   /* LARVAL SA */
   };
   
   struct xformsw;
   struct enc_xform;
   struct auth_hash;
   struct comp_algo;
   
   /*
    * Security Association
    *
    * For INBOUND packets we do SA lookup using SPI, thus only SPIHASH is used.
    * For OUTBOUND packets there may be several SA suitable for packet.
    * We use key_preferred_oldsa variable to choose better SA. First of we do
    * lookup for suitable SAH using packet's saidx. Then we use SAH's savtree
    * to search better candidate. The newer SA (by created time) are placed
    * in the beginning of the savtree list. There is no preference between
    * DYING and MATURE.
    *
    * NB: Fields with a tdb_ prefix are part of the "glue" used
    *     to interface to the OpenBSD crypto support.  This was done
    *     to distinguish this code from the mainline KAME code.
    * NB: Fields are sorted on the basis of the frequency of changes, i.e.
    *     constants and unchangeable fields are going first.
    * NB: if you want to change this structure, check that this will not break
    *     key_updateaddresses().
    */
   struct secasvar {
           uint32_t spi;                   /* SPI Value, network byte order */
           uint32_t flags;                 /* holder for SADB_KEY_FLAGS */
           uint32_t seq;                   /* sequence number */
           pid_t pid;                      /* message's pid */
           u_int ivlen;                    /* length of IV */
   
           struct secashead *sah;          /* back pointer to the secashead */
           struct seckey *key_auth;        /* Key for Authentication */
           struct seckey *key_enc;         /* Key for Encryption */
           struct secreplay *replay;       /* replay prevention */
           struct secnatt *natt;           /* NAT-T config */
           struct mtx *lock;               /* update/access lock */
   
           const struct xformsw *tdb_xform;        /* transform */
           const struct enc_xform *tdb_encalgxform;/* encoding algorithm */
           const struct auth_hash *tdb_authalgxform;/* authentication algorithm */
           const struct comp_algo *tdb_compalgxform;/* compression algorithm */
           uint64_t tdb_cryptoid;          /* crypto session id */
   
           uint8_t alg_auth;               /* Authentication Algorithm Identifier*/
           uint8_t alg_enc;                /* Cipher Algorithm Identifier */
           uint8_t alg_comp;               /* Compression Algorithm Identifier */
           uint8_t state;                  /* Status of this SA (pfkeyv2.h) */
   
           counter_u64_t lft_c;            /* CURRENT lifetime */
   #define lft_c_allocations       lft_c
   #define lft_c_bytes             lft_c + 1
           struct seclifetime *lft_h;      /* HARD lifetime */
           struct seclifetime *lft_s;      /* SOFT lifetime */
   
           uint64_t created;               /* time when SA was created */
           uint64_t firstused;             /* time when SA was first used */
   
           TAILQ_ENTRY(secasvar) chain;
           LIST_ENTRY(secasvar) spihash;
           LIST_ENTRY(secasvar) drainq;    /* used ONLY by flush callout */
   
           uint64_t cntr;                  /* counter for GCM and CTR */
           volatile u_int refcnt;          /* reference count */
   };
   
   #define SECASVAR_LOCK(_sav)             mtx_lock((_sav)->lock)
   #define SECASVAR_UNLOCK(_sav)           mtx_unlock((_sav)->lock)
   #define SECASVAR_LOCK_ASSERT(_sav)      mtx_assert((_sav)->lock, MA_OWNED)
   #define SAV_ISGCM(_sav)                                                 \
                           ((_sav)->alg_enc == SADB_X_EALG_AESGCM8 ||      \
                           (_sav)->alg_enc == SADB_X_EALG_AESGCM12 ||      \
                           (_sav)->alg_enc == SADB_X_EALG_AESGCM16)
   #define SAV_ISCTR(_sav) ((_sav)->alg_enc == SADB_X_EALG_AESCTR)
   #define SAV_ISCTRORGCM(_sav)    (SAV_ISCTR((_sav)) || SAV_ISGCM((_sav)))
   
   /* Replay prevention, protected by SECASVAR_LOCK:
    *  (m) locked by mtx
    *  (c) read only except during creation / free
    */
   struct secreplay {
           u_int32_t count;        /* (m) */
           u_int wsize;            /* (c) window size, i.g. 4 bytes */
           u_int32_t seq;          /* (m) used by sender */
           u_int32_t lastseq;      /* (m) used by receiver */
           u_int32_t *bitmap;      /* (m) used by receiver */
           u_int bitmap_size;      /* (c) size of the bitmap array */
           int overflow;           /* (m) overflow flag */
   };
   
   /* socket table due to send PF_KEY messages. */
   struct secreg {
           LIST_ENTRY(secreg) chain;
   
           struct socket *so;
   };
   
   /* acquiring list table. */
   struct secacq {
           LIST_ENTRY(secacq) chain;
           LIST_ENTRY(secacq) addrhash;
           LIST_ENTRY(secacq) seqhash;
   
           struct secasindex saidx;
           uint32_t seq;           /* sequence number */
           time_t created;         /* for lifetime */
           int count;              /* for lifetime */
   };
   
   /* Sensitivity Level Specification */
   /* nothing */
   
   #define SADB_KILL_INTERVAL      600     /* six seconds */
   
   /* secpolicy */
   extern struct secpolicy *keydb_newsecpolicy(void);
   extern void keydb_delsecpolicy(struct secpolicy *);
   /* secashead */
   extern struct secashead *keydb_newsecashead(void);
   extern void keydb_delsecashead(struct secashead *);
   /* secasvar */
   extern struct secasvar *keydb_newsecasvar(void);
   extern void keydb_refsecasvar(struct secasvar *);
   extern void keydb_freesecasvar(struct secasvar *);
   /* secreplay */
   extern struct secreplay *keydb_newsecreplay(size_t);
   extern void keydb_delsecreplay(struct secreplay *);
   /* secreg */
   extern struct secreg *keydb_newsecreg(void);
   extern void keydb_delsecreg(struct secreg *);
   
   #endif /* _KERNEL */
   
   #endif /* _NETIPSEC_KEYDB_H_ */

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