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pimd: messages to neighbors should have TTL = 1

Browse Source 
Ticket:CM-12924
Reviewed By:shapd
Testing Done: configure PIM neighbor, verify PIM hello packet dump for ttl to be 1.

Set TTL to 1 for outgoing multicast control packets destine to ALL-PIM-ROUTERS as oppose to unicast mcast packets.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
This commit is contained in:
Chirag Shah 2017-01-12 17:15:44 -08:00 committed by Donald Sharp
parent 5637da0501
commit d62c5c0381
1 changed files with 26 additions and 2 deletions
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28
pimd/pim_pim.c
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@ -557,6 +557,8 @@ pim_msg_send(int fd, struct in_addr src,
socklen_t tolen;
unsigned char buffer[10000];
unsigned char *msg_start;
uint8_t ttl = MAXTTL;
enum pim_msg_type pim_type = PIM_MSG_TYPE_HELLO;
struct ip *ip;
memset (buffer, 0, 10000);
@ -565,14 +567,36 @@ pim_msg_send(int fd, struct in_addr src,
msg_start = buffer + sizeof (struct ip);
memcpy (msg_start, pim_msg, pim_msg_size);
ip = (struct ip *)buffer;
/* TTL for packets destine to ALL-PIM-ROUTERS is 1 */
pim_type = PIM_MSG_HDR_GET_TYPE (pim_msg);
switch (pim_type)
{
case PIM_MSG_TYPE_HELLO:
case PIM_MSG_TYPE_JOIN_PRUNE:
case PIM_MSG_TYPE_BOOTSTRAP:
case PIM_MSG_TYPE_ASSERT:
ttl = 1;
break;
case PIM_MSG_TYPE_REGISTER:
case PIM_MSG_TYPE_REG_STOP:
case PIM_MSG_TYPE_GRAFT:
case PIM_MSG_TYPE_GRAFT_ACK:
case PIM_MSG_TYPE_CANDIDATE:
ttl = IPDEFTTL;
break;
default:
ttl = MAXTTL;
break;
}
ip = (struct ip *) buffer;
ip->ip_id = htons (++ip_id);
ip->ip_hl = 5;
ip->ip_v = 4;
ip->ip_p = PIM_IP_PROTO_PIM;
ip->ip_src = src;
ip->ip_dst = dst;
ip->ip_ttl = MAXTTL;
ip->ip_ttl = ttl;
ip->ip_len = htons (sendlen);
if (PIM_DEBUG_PIM_PACKETS) {