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/*
PIM for Quagga
Copyright (C) 2008 Everton da Silva Marques
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA
$QuaggaId: $Format:%an, %ai, %h$ $
*/
#include <zebra.h>
#include "if.h"
#include "pimd.h"
#include "pim_pim.h"
#include "pim_msg.h"
#include "pim_util.h"
void pim_msg_build_header(uint8_t *pim_msg, int pim_msg_size,
uint8_t pim_msg_type)
{
uint16_t checksum;
zassert(pim_msg_size >= PIM_PIM_MIN_LEN);
/*
* Write header
*/
*(uint8_t *) PIM_MSG_HDR_OFFSET_VERSION(pim_msg) = (PIM_PROTO_VERSION << 4) | pim_msg_type;
*(uint8_t *) PIM_MSG_HDR_OFFSET_RESERVED(pim_msg) = 0;
/*
* Compute checksum
*/
*(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0;
checksum = in_cksum(pim_msg, pim_msg_size);
*(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = checksum;
}
uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf,
int buf_size,
struct in_addr addr)
{
const int ENCODED_IPV4_UCAST_SIZE = 6;
if (buf_size < ENCODED_IPV4_UCAST_SIZE) {
return 0;
}
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
memcpy(buf+2, &addr, sizeof(struct in_addr));
return buf + ENCODED_IPV4_UCAST_SIZE;
}
uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf,
int buf_size,
struct in_addr addr)
{
const int ENCODED_IPV4_GROUP_SIZE = 8;
if (buf_size < ENCODED_IPV4_GROUP_SIZE) {
return 0;
}
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
buf[2] = '\0'; /* reserved */
buf[3] = 32; /* mask len */
memcpy(buf+4, &addr, sizeof(struct in_addr));
return buf + ENCODED_IPV4_GROUP_SIZE;
}
uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf,
int buf_size,
struct in_addr addr)
{
const int ENCODED_IPV4_SOURCE_SIZE = 8;
if (buf_size < ENCODED_IPV4_SOURCE_SIZE) {
return 0;
}
buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
buf[1] = '\0'; /* native encoding */
buf[2] = 4; /* reserved = 0 | S bit = 1 | W bit = 0 | R bit = 0 */
buf[3] = 32; /* mask len */
memcpy(buf+4, &addr, sizeof(struct in_addr));
return buf + ENCODED_IPV4_SOURCE_SIZE;
}
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