pimd: Mark Default TOS Values for PIM & IGMP Outgoing packets

This will facilitate the Hardware to prefer control packets over
Normal Data packets while queuing, so that during congestion, the
chance of dropping control packet will be minimised.

Signed-off-by: Satheesh Kumar K <sathk@cumulusnetworks.com>

diff --git a/pimd/pim_pim.c b/pimd/pim_pim.c
index 12b28ed9af68015f44d2b858929b4842967e7648..cd2d306f3db2e52b931e953a3ff1dd38e8edd2a8 100644 (file)
--- a/pimd/pim_pim.c
+++ b/pimd/pim_pim.c
@@ -574,6 +574,7 @@ int pim_msg_send(int fd, struct in_addr src, struct in_addr dst,
        ip->ip_id = htons(++ip_id);
        ip->ip_hl = 5;
        ip->ip_v = 4;
+       ip->ip_tos = IPTOS_PREC_INTERNETCONTROL;
        ip->ip_p = PIM_IP_PROTO_PIM;
        ip->ip_src = src;
        ip->ip_dst = dst;

diff --git a/pimd/pim_sock.c b/pimd/pim_sock.c
index 82255cd3b077f6bc679b172f52bdb6dd04831a33..7f03e18389e879db8275efe4862ae63937a133a1 100644 (file)
--- a/pimd/pim_sock.c
+++ b/pimd/pim_sock.c
@@ -255,6 +255,12 @@ int pim_socket_mcast(int protocol, struct in_addr ifaddr, struct interface *ifp,
                }
        }
 
+       /* Set Tx socket DSCP byte */
+       if (setsockopt_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL)) {
+               zlog_warn("can't set sockopt IP_TOS to PIM/IGMP socket %d: %s",
+                         fd, safe_strerror(errno));
+       }
+
        return fd;
 }