/*      $OpenBSD: l2tp_local.h,v 1.6 2012/07/16 18:05:36 markus Exp $   */
/*-
 * Copyright (c) 2009 Internet Initiative Japan Inc.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 L2TP_LOCAL_H
#define L2TP_LOCAL_H 1
/* $Id: l2tp_local.h,v 1.6 2012/07/16 18:05:36 markus Exp $ */

#ifndef GETSHORT
#define GETSHORT(s, cp) {       \
    s = *(cp)++ << 8;           \
    s |= *(cp)++;               \
}
#endif

struct l2tp_header {
#if     BYTE_ORDER == LITTLE_ENDIAN
        uint8_t         p:1,
                        o:1,
                        x2:1,
                        s:1,
                        x1:2,
                        l:1,
                        t:1;
        uint8_t         ver:4,
                        x3:4;
#else
        uint8_t         t:1,
                        l:1,
                        x1:2,
                        s:1,
                        x2:1,
                        o:1,
                        p:1;
        uint8_t         x3:4,
                        ver:4;
#endif
        uint16_t        length;
        uint16_t        tunnel_id;
        uint16_t        session_id;
        uint16_t        ns;
        uint16_t        nr;
} __attribute__((__packed__));

#ifndef countof
#define countof(x)      (sizeof((x)) / sizeof((x)[0]))
#endif

#define LISTENER_SOCK(ctrl)     \
        ((l2tpd_listener *)slist_get(&(ctrl)->l2tpd->listener, \
            (ctrl)->listener_index))->sock
#ifndef SIN
#define SIN(ss) ((struct sockaddr_in *)(ss))
#endif
#define SIN6(ss)        ((struct sockaddr_in6 *)(ss))

#define L2TP_SESSION_ID_MASK            0x00007fff
#define L2TP_SESSION_ID_SHUFFLE_MARK    0x10000000

#ifndef L2TP_NCALL 
#define L2TP_NCALL              10000
#endif

#if L2TP_NCALL > 0xffff
#error L2TP_NCALL must be less than 65536
#endif

#ifndef USE_LIBSOCKUTIL
struct in_ipsec_sa_cookie       {
        u_int32_t       ipsecflow;
};
#endif

#endif