diff options
| author | Chirag Shah <chirag@cumulusnetworks.com> | 2017-01-12 17:15:44 -0800 |
|---|---|---|
| committer | Donald Sharp <sharpd@cumulusnetworks.com> | 2017-02-14 15:52:56 -0500 |
| commit | d62c5c03816d8dc525424b04c6b4b3c3ad23a29c (patch) | |
| tree | ce8499f03319a00f32e918da1b57cc0c50b5a8fb /pimd/pim_pim.c | |
| parent | 5637da0501faa600273ecd7a2ed39cdbbe4531b1 (diff) | |
pimd: messages to neighbors should have TTL = 1
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>
Diffstat (limited to 'pimd/pim_pim.c')
| -rw-r--r-- | pimd/pim_pim.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/pimd/pim_pim.c b/pimd/pim_pim.c index 840004c375..c96cc187c7 100644 --- a/pimd/pim_pim.c +++ b/pimd/pim_pim.c @@ -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) { |