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/* $OpenBSD: l2tp_subr.h,v 1.6 2013/09/20 07:26:23 yasuoka 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_SUBR_H
#define L2TP_SUBR_H 1
/* $Id: l2tp_subr.h,v 1.6 2013/09/20 07:26:23 yasuoka Exp $ */
/**
* structure of L2TP Attribute Value Pair (AVP) packet header
*/
struct l2tp_avp
{
#if BYTE_ORDER == LITTLE_ENDIAN
uint16_t length:10,
rsvd:4,
is_hidden:1,
is_mandatory:1;
#else
uint16_t is_mandatory:1,
is_hidden:1,
rsvd:4,
length:10;
#endif
uint16_t vendor_id;
uint16_t attr_type;
u_char attr_value[0];
} __attribute__((__packed__)) ;
#define avp_attr_length(avp) ((avp)->length - 6)
static inline uint16_t
avp_get_val16(struct l2tp_avp *avp)
{
return (avp->attr_value[0] << 8) | avp->attr_value[1];
}
static inline uint32_t
avp_get_val32(struct l2tp_avp *avp)
{
return (avp->attr_value[0] << 24) | (avp->attr_value[1] << 16) |
(avp->attr_value[2] << 8) | avp->attr_value[3];
}
static inline void
avp_set_val16(struct l2tp_avp *avp, uint16_t val)
{
avp->attr_value[0] = val >> 8;
avp->attr_value[1] = val & 0xff;
}
static inline void
avp_set_val32(struct l2tp_avp *avp, uint32_t val)
{
avp->attr_value[0] = val >> 24;
avp->attr_value[1] = val >> 16;
avp->attr_value[2] = val >> 8;
avp->attr_value[3] = val & 0xff;
}
static inline int
short_cmp(const void *m, const void *n)
{
return ((intptr_t)m - (intptr_t)n);
}
static inline uint32_t
short_hash(const void *v, int sz)
{
return ((uintptr_t)v % sz);
}
/*
* macro to check AVP size.
* Prepare 1) char array `emes' for error message, 2) size_check_failed label
* before use this macro.
*/
#define AVP_SIZE_CHECK(_avp, _op, _exp) \
do { \
if (!((_avp)->length _op (_exp))) { \
snprintf(emes, sizeof(emes), \
"invalid packet size %s %d" #_op "%d)", \
avp_attr_type_string((_avp)->attr_type), \
(_avp)->length, (_exp)); \
goto size_check_failed; \
} \
} while (/* CONSTCOND */0)
#define AVP_MAXLEN_CHECK(_avp, _maxlen) \
do { \
if ((_avp)->length > (_maxlen) + 6) { \
snprintf(emes, sizeof(emes), \
"Attribute value is too long %s %d > %d", \
avp_attr_type_string((_avp)->attr_type), \
(_avp)->length - 6, (int)(_maxlen)); \
goto size_check_failed; \
} \
} while (/* CONSTCOND */0)
#ifdef __cplusplus
extern "C" {
#endif
int avp_enum (struct l2tp_avp *, const u_char *, int, int);
const char *avp_attr_type_string (int);
struct l2tp_avp *avp_find_message_type_avp(struct l2tp_avp *, const u_char *, int);
struct l2tp_avp *avp_find(struct l2tp_avp *, const u_char *, int, uint16_t, uint16_t, int);
int bytebuf_add_avp (bytebuffer *, struct l2tp_avp *, int);
const char *avp_mes_type_string (int);
const char * l2tp_cdn_rcode_string(int);
const char * l2tp_stopccn_rcode_string(int);
const char * l2tp_ecode_string(int);
#ifdef __cplusplus
}
#endif
#endif
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