Subject: [PATCH 4/6] [IPV4] SNMP: Support InMcastPkts and InBcastPkts

From: Mitsuru Chinen <[email-masked]>
Date: Tue, 17 Apr 2007 20:13:56 +0900

A received IP multicast datagram should be counted as InMcastPkts.
By the same token, a received IP broadcast datagram should be
counted as InBcastPkts.

Signed-off-by: Mitsuru Chinen <[email-masked]>
---
 net/ipv4/ip_input.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c8c455d..9706939 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -329,6 +329,7 @@ drop:
 static inline int ip_rcv_finish(struct sk_buff *skb)
 {
 	const struct iphdr *iph = ip_hdr(skb);
+	struct rtable *rt;
 
 	/*
 	 *	Initialise the virtual path cache for the packet. It describes
@@ -360,6 +361,12 @@ static inline int ip_rcv_finish(struct s
 	if (iph->ihl > 5 && ip_rcv_options(skb))
 		goto drop;
 
+	rt = (struct rtable*)skb->dst;
+	if (rt->rt_type == RTN_MULTICAST)
+		IP_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS);
+	else if (rt->rt_type == RTN_BROADCAST)
+		IP_INC_STATS_BH(IPSTATS_MIB_INBCASTPKTS);
+
 	return dst_input(skb);
 
 drop:
-- 
1.4.3.4