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/*
* $Id: libnet_build_stp.c,v 1.9 2004/04/13 17:32:28 mike Exp $
*
* libnet
* libnet_build_stp.c - STP packet assembler
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* 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.
*
*/
#include "common.h"
libnet_ptag_t
libnet_build_stp_conf(uint16_t id, uint8_t version, uint8_t bpdu_type,
uint8_t flags, const uint8_t *root_id, uint32_t root_pc, const uint8_t *bridge_id,
uint16_t port_id, uint16_t message_age, uint16_t max_age,
uint16_t hello_time, uint16_t f_delay, const uint8_t *payload,
uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
/* until we get some data marshalling in place we can't use this */
/* struct libnet_stp_conf_hdr stp_hdr; */
uint8_t stp_hdr[35];
uint16_t value_s;
uint32_t value_l;
if (l == NULL)
{
return (-1);
}
n = LIBNET_STP_CONF_H + payload_s; /* size of memory block */
h = 0; /* no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_STP_CONF_H);
if (p == NULL)
{
return (-1);
}
/* until we get some data marshalling in place we can't use this */
/*
stp_hdr.stp_id = htons(id);
stp_hdr.stp_version = version;
stp_hdr.stp_bpdu_type = bpdu_type;
stp_hdr.stp_flags = flags;
memcpy(&stp_hdr.stp_rootid, root_id, 8);
stp_hdr.stp_rootpc = htonl(root_pc);
memcpy(&stp_hdr.stp_bridgeid, bridge_id, 8);
stp_hdr.stp_portid = htons(port_id);
stp_hdr.stp_mage = htons(message_age);
stp_hdr.stp_maxage = htons(max_age);
stp_hdr.stp_hellot = htons(hello_time);
stp_hdr.stp_fdelay = htons(f_delay);
*/
value_s = htons(id);
memcpy(stp_hdr, &value_s, 2);
stp_hdr[2] = version;
stp_hdr[3] = bpdu_type;
stp_hdr[4] = flags;
memcpy(&stp_hdr[5], root_id, 8);
value_l = htonl(root_pc);
memcpy(&stp_hdr[13], &value_l, 4);
memcpy(&stp_hdr[17], bridge_id, 8);
value_s = htons(port_id);
memcpy(&stp_hdr[25], &value_s, 2);
#if (LIBNET_BIG_ENDIAN == 1)
value_s = htons(message_age);
#else
value_s = message_age;
#endif
memcpy(&stp_hdr[27], &value_s, 2);
#if (LIBNET_BIG_ENDIAN == 1)
value_s = htons(max_age);
#else
value_s = max_age;
#endif
memcpy(&stp_hdr[29], &value_s, 2);
#if (LIBNET_BIG_ENDIAN == 1)
value_s = htons(hello_time);
#else
value_s = hello_time;
#endif
memcpy(&stp_hdr[31], &value_s, 2);
#if (LIBNET_BIG_ENDIAN == 1)
value_s = htons(f_delay);
#else
value_s = f_delay;
#endif
memcpy(&stp_hdr[33], &value_s, 2);
/* until we get some data marshalling in place we can't use this */
/*n = libnet_pblock_append(l, p, (uint8_t *)&stp_hdr, LIBNET_STP_CONF_H); */
if (libnet_pblock_append(l, p, stp_hdr, LIBNET_STP_CONF_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_STP_CONF_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_stp_tcn(uint16_t id, uint8_t version, uint8_t bpdu_type,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_stp_tcn_hdr stp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_STP_TCN_H + payload_s; /* size of memory block */
h = 0; /* no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_STP_TCN_H);
if (p == NULL)
{
return (-1);
}
memset(&stp_hdr, 0, sizeof(stp_hdr));
stp_hdr.stp_id = htons(id);
stp_hdr.stp_version = version;
stp_hdr.stp_bpdu_type = bpdu_type;
if (libnet_pblock_append(l, p, (uint8_t *)&stp_hdr, LIBNET_STP_TCN_H) == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_STP_TCN_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/**
* Local Variables:
* indent-tabs-mode: nil
* c-file-style: "stroustrup"
* End:
*/
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