Merge branch 'ipv4-routing-cleanups'

Alexander Duyck says:

====================
Minor IPv4 routing cleanups

These patches just contain some minor cleanups to address a few minor
issues.  The first and the third mostly just improve readability.  The
second patch should improve the performance for multicast destination
addresses that do not have a localhost source IP address by avoiding some
unnecessary dereferences.
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

include/linux/igmp.h

@@ -110,7 +110,7 @@ struct ip_mc_list {
 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
 
-extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
+extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
 extern int igmp_rcv(struct sk_buff *);
 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);

net/ipv4/igmp.c

@@ -2569,7 +2569,7 @@ void ip_mc_drop_socket(struct sock *sk)
 }
 
 /* called with rcu_read_lock() */
-int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
+int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
 {
 	struct ip_mc_list *im;
 	struct ip_mc_list __rcu **mc_hash;

net/ipv4/route.c

@@ -1487,9 +1487,8 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	    skb->protocol != htons(ETH_P_IP))
 		goto e_inval;
 
-	if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev)))
-		if (ipv4_is_loopback(saddr))
-			goto e_inval;
+	if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev))
+		goto e_inval;
 
 	if (ipv4_is_zeronet(saddr)) {
 		if (!ipv4_is_local_multicast(daddr))
@@ -1760,7 +1759,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 		err = fib_validate_source(skb, saddr, daddr, tos,
 					  0, dev, in_dev, &itag);
 		if (err < 0)
-			goto martian_source_keep_err;
+			goto martian_source;
 		goto local_input;
 	}
 
@@ -1782,7 +1781,7 @@ out:	return err;
 		err = fib_validate_source(skb, saddr, 0, tos, 0, dev,
 					  in_dev, &itag);
 		if (err < 0)
-			goto martian_source_keep_err;
+			goto martian_source;
 	}
 	flags |= RTCF_BROADCAST;
 	res.type = RTN_BROADCAST;
@@ -1858,8 +1857,6 @@ out:	return err;
 	goto out;
 
 martian_source:
-	err = -EINVAL;
-martian_source_keep_err:
 	ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
 	goto out;
 }