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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
*/
#include <zebra.h>
#include "if.h"
#include "log.h"
#include "prefix.h"
#include "vty.h"
#include "plist.h"
#include "pimd.h"
#include "pim_vty.h"
#include "pim_pim.h"
#include "pim_msg.h"
#include "pim_util.h"
#include "pim_str.h"
#include "pim_rp.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, uint8_t bits)
{
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] = bits;
buf[3] = 32; /* mask len */
memcpy(buf+4, &addr, sizeof(struct in_addr));
return buf + ENCODED_IPV4_SOURCE_SIZE;
}
int
pim_msg_join_prune_encode (uint8_t *buf, int buf_size, int is_join,
struct in_addr source, struct in_addr group,
struct in_addr upstream, int holdtime)
{
uint8_t *pim_msg = buf;
uint8_t *pim_msg_curr = buf + PIM_MSG_HEADER_LEN;
uint8_t *end = buf + buf_size;
struct in_addr stosend;
uint8_t bits;
int remain;
remain = end - pim_msg_curr;
pim_msg_curr = pim_msg_addr_encode_ipv4_ucast (pim_msg_curr, buf_size - PIM_MSG_HEADER_LEN, upstream);
if (!pim_msg_curr) {
char dst_str[100];
pim_inet4_dump("<dst?>", upstream, dst_str, sizeof(dst_str));
zlog_warn("%s: failure encoding destination address %s: space left=%d",
__PRETTY_FUNCTION__, dst_str, remain);
return -3;
}
remain = end - pim_msg_curr;
if (remain < 4) {
zlog_warn("%s: group will not fit: space left=%d",
__PRETTY_FUNCTION__, remain);
return -4;
}
*pim_msg_curr = 0; /* reserved */
++pim_msg_curr;
*pim_msg_curr = 1; /* number of groups */
++pim_msg_curr;
*((uint16_t *) pim_msg_curr) = htons(holdtime);
++pim_msg_curr;
++pim_msg_curr;
remain = end - pim_msg_curr;
pim_msg_curr = pim_msg_addr_encode_ipv4_group (pim_msg_curr, remain,
group);
if (!pim_msg_curr) {
char group_str[100];
pim_inet4_dump("<grp?>", group, group_str, sizeof(group_str));
zlog_warn("%s: failure encoding group address %s: space left=%d",
__PRETTY_FUNCTION__, group_str, remain);
return -5;
}
remain = end - pim_msg_curr;
if (remain < 4) {
zlog_warn("%s: sources will not fit: space left=%d",
__PRETTY_FUNCTION__, remain);
return -6;
}
/* number of joined sources */
*((uint16_t *) pim_msg_curr) = htons(is_join ? 1 : 0);
++pim_msg_curr;
++pim_msg_curr;
/* number of pruned sources */
*((uint16_t *) pim_msg_curr) = htons(is_join ? 0 : 1);
++pim_msg_curr;
++pim_msg_curr;
remain = end - pim_msg_curr;
if (source.s_addr == INADDR_ANY)
{
struct pim_rpf *rpf = pim_rp_g (group);
bits = PIM_ENCODE_SPARSE_BIT | PIM_ENCODE_WC_BIT | PIM_ENCODE_RPT_BIT;
stosend = rpf->rpf_addr.u.prefix4;
}
else
{
bits = PIM_ENCODE_SPARSE_BIT;
stosend = source;
}
pim_msg_curr = pim_msg_addr_encode_ipv4_source (pim_msg_curr, remain, stosend, bits);
if (!pim_msg_curr) {
char source_str[100];
pim_inet4_dump("<src?>", source, source_str, sizeof(source_str));
zlog_warn("%s: failure encoding source address %s: space left=%d",
__PRETTY_FUNCTION__, source_str, remain);
return -7;
}
remain = pim_msg_curr - pim_msg;
pim_msg_build_header (pim_msg, remain, PIM_MSG_TYPE_JOIN_PRUNE);
return remain;
}
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