[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 <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c8c455dd9caf..97069399d864 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 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: