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authorAlexander Duyck <aduyck@mirantis.com>2015-09-28 11:10:38 -0700
committerDavid S. Miller <davem@davemloft.net>2015-09-29 16:27:47 -0700
commit75fea73dce4ed7c1725f9f5c0adf5aecc8d0fcfd (patch)
tree0201cb3b7c7712b357c198b1fc942242916d062b /net/ipv4/route.c
parent2094acbb714e24e464c810c2d8fa57493fcb25a6 (diff)
net: Swap ordering of tests in ip_route_input_mc
This patch just swaps the ordering of one of the conditional tests in ip_route_input_mc. Specifically it swaps the testing for the source address to see if it is loopback, and the test to see if we allow a loopback source address. The reason for swapping these two tests is because it is much faster to test if an address is loopback than it is to dereference several pointers to get at the net structure to see if the use of loopback is allowed. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6bab84503cd9..43508c8d08e2 100644
--- a/net/ipv4/route.c
+++ b/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))