snmp: add missing counters for RFC 4293

The IP MIB (RFC 4293) defines stats for InOctets, OutOctets, InMcastOctets and
OutMcastOctets:
http://tools.ietf.org/html/rfc4293
But it seems we don't track those in any way that easy to separate from other
protocols.  This patch adds those missing counters to the stats file. Tested
successfully by me

With help from Eric Dumazet.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 3e7e910..ea19c37 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -181,10 +181,10 @@
 	struct net_device *dev = dst->dev;
 	unsigned int hh_len = LL_RESERVED_SPACE(dev);
 
-	if (rt->rt_type == RTN_MULTICAST)
-		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTMCASTPKTS);
-	else if (rt->rt_type == RTN_BROADCAST)
-		IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTBCASTPKTS);
+	if (rt->rt_type == RTN_MULTICAST) {
+		IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTMCAST, skb->len);
+	} else if (rt->rt_type == RTN_BROADCAST)
+		IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTBCAST, skb->len);
 
 	/* Be paranoid, rather than too clever. */
 	if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
@@ -244,7 +244,7 @@
 	/*
 	 *	If the indicated interface is up and running, send the packet.
 	 */
-	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTREQUESTS);
+	IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
 
 	skb->dev = dev;
 	skb->protocol = htons(ETH_P_IP);
@@ -298,7 +298,7 @@
 {
 	struct net_device *dev = skb->dst->dev;
 
-	IP_INC_STATS(dev_net(dev), IPSTATS_MIB_OUTREQUESTS);
+	IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
 
 	skb->dev = dev;
 	skb->protocol = htons(ETH_P_IP);