Commit 6c91afe1 authored Mar 09, 2011 by David S. Miller

ipv4: Fix erroneous uses of ifa_address.



In usual cases ifa_address == ifa_local, but in the case where
SIOCSIFDSTADDR sets the destination address on a point-to-point
link, ifa_address gets set to that destination address.

Therefore we should use ifa_local when we want the local interface
address.

There were two cases where the selection was done incorrectly:

1) When devinet_ioctl() does matching, it checks ifa_address even
   though gifconf correct reported ifa_local to the user

2) IN_DEV_ARP_NOTIFY handling sends a gratuitous ARP using
   ifa_address instead of ifa_local.

Reported-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent e3806882

net/ipv4/devinet.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -670,7 +670,7 @@ int devinet_ioctl(struct net net, unsigned int cmd, void __user arg)
		ifap = &ifa->ifa_next) {
		if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
		sin_orig.sin_addr.s_addr ==
		ifa->ifa_address) {
		ifa->ifa_local) {
		break; /* found */
		}
		}
		@@ -1040,8 +1040,8 @@ static void inetdev_send_gratuitous_arp(struct net_device *dev,
		return;

		arp_send(ARPOP_REQUEST, ETH_P_ARP,
		ifa->ifa_address, dev,
		ifa->ifa_address, NULL,
		ifa->ifa_local, dev,
		ifa->ifa_local, NULL,
		dev->dev_addr, NULL);
		}