[IPV4] SNMP: Support InMcastPkts and InBcastPkts

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 protected]> Signed-off-by: David S. Miller <[email protected]>
johnjwang · Apr 30, 2007 · 5506b54 · 5506b54
1 parent 704aed5
commit 5506b54
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
@@ -329,6 +329,7 @@ static inline int ip_rcv_options(struct sk_buff *skb)
 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 sk_buff *skb)
 	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: