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[PATCH] bonding: Validate probe replies in ARP monitor

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Add logic to check ARP request / reply packets used for ARP
monitor link integrity checking.

	The current method simply examines the slave device to see if it
has sent and received traffic; this can be fooled by extraneous traffic.
For example, if multiple hosts running bonding are behind a common
switch, the probe traffic from the multiple instances of bonding will
update the tx/rx times on each other's slave devices.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jay Vosburgh
2006-09-22 21:54:53 -07:00
committed by Jeff Garzik
parent 70298705bb
commit f5b2b966f0
6 changed files with 325 additions and 10 deletions
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7
include/linux/netdevice.h
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@@ -1016,7 +1016,8 @@ static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
}
/* On bonding slaves other than the currently active slave, suppress
* duplicates except for 802.3ad ETH_P_SLOW and alb non-mcast/bcast.
* duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
* ARP on active-backup slaves with arp_validate enabled.
*/
static inline int skb_bond_should_drop(struct sk_buff *skb)
{
@@ -1025,6 +1026,10 @@ static inline int skb_bond_should_drop(struct sk_buff *skb)
if (master &&
(dev->priv_flags & IFF_SLAVE_INACTIVE)) {
if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
skb->protocol == __constant_htons(ETH_P_ARP))
return 0;
if (master->priv_flags & IFF_MASTER_ALB) {
if (skb->pkt_type != PACKET_BROADCAST &&
skb->pkt_type != PACKET_MULTICAST)