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policy.h

/* $Id: policy.h,v 1.5 2004/06/11 16:00:17 ludvigm 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 _POLICY_H
#define _POLICY_H

#include <sys/queue.h>

/* refs. ipsec.h */
/*
 * 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 policyindex {
      u_int8_t dir;                 /* direction of packet flow, see blow */
      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 */
      u_int32_t priority;           /* priority for the policy */
};

/* Security Policy Data Base */
struct secpolicy {
      TAILQ_ENTRY(secpolicy) chain;

      struct policyindex spidx;     /* selector */
      u_int32_t id;                 /* It's unique number on the system. */

      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.*/
};

/* Security Assocciation Index */
/* NOTE: Ensure to be same address family */
struct secasindex {
      struct sockaddr_storage src;  /* srouce address for SA */
      struct sockaddr_storage dst;  /* destination address for SA */
      u_int16_t proto;        /* IPPROTO_ESP or IPPROTO_AH */
      u_int8_t mode;                /* mode of protocol, see ipsec.h */
      u_int32_t reqid;        /* reqid id who owned this SA */
                              /* see IPSEC_MANUAL_REQID_MAX. */
};

/* 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 secpolicy *sp;   /* back pointer to SP */
};

#ifdef HAVE_PFKEY_POLICY_PRIORITY
#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, _priority, idx)              \
do {                                                                         \
      bzero((idx), sizeof(struct policyindex));                            \
      (idx)->dir = (_dir);                                                 \
      (idx)->prefs = (ps);                                                 \
      (idx)->prefd = (pd);                                                 \
      (idx)->ul_proto = (ulp);                                             \
      (idx)->priority = (_priority);                                        \
      memcpy(&(idx)->src, (s), sysdep_sa_len((struct sockaddr *)(s)));          \
      memcpy(&(idx)->dst, (d), sysdep_sa_len((struct sockaddr *)(d)));          \
} while (0)
#else
#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx)              \
do {                                                                         \
      bzero((idx), sizeof(struct policyindex));                            \
      (idx)->dir = (_dir);                                                 \
      (idx)->prefs = (ps);                                                 \
      (idx)->prefd = (pd);                                                 \
      (idx)->ul_proto = (ulp);                                             \
      memcpy(&(idx)->src, (s), sysdep_sa_len((struct sockaddr *)(s)));          \
      memcpy(&(idx)->dst, (d), sysdep_sa_len((struct sockaddr *)(d)));          \
} while (0)
#endif

struct ph2handle;
struct policyindex;
extern struct secpolicy *getsp __P((struct policyindex *));
extern struct secpolicy *getsp_r __P((struct policyindex *));
struct secpolicy *getspbyspid __P((u_int32_t));
extern int cmpspidxstrict __P((struct policyindex *, struct policyindex *));
extern int cmpspidxwild __P((struct policyindex *, struct policyindex *));
extern struct secpolicy *newsp __P((void));
extern void delsp __P((struct secpolicy *));
extern void delsp_bothdir __P((struct policyindex *));
extern void inssp __P((struct secpolicy *));
extern void remsp __P((struct secpolicy *));
extern void flushsp __P((void));
extern void initsp __P((void));
extern struct ipsecrequest *newipsecreq __P((void));

extern const char *spidx2str __P((const struct policyindex *));

#endif /* _POLICY_H */

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