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ipv4: Fix erroneous uses of ifa_address.

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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>
This commit is contained in:
David S. Miller 2011-03-09 13:27:16 -08:00
parent e380688217
commit 6c91afe1a9
1 changed files with 3 additions and 3 deletions
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6
net/ipv4/devinet.c
View file

@ -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);
}