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authorJay Vosburgh <fubar@us.ibm.com>2007-07-09 10:42:47 -0700
committerJeff Garzik <jeff@garzik.org>2007-07-10 12:41:19 -0400
commitc2edacf80e155ef54ae4774379d461b60896bc2e (patch)
tree0ec119a16bc4af036968cf22cde402c381efca25 /net/ipv6
parent89c0d26be7037cd5bbce3bbf12580ba70ed8f382 (diff)
bonding / ipv6: no addrconf for slaves separately from master
At present, when a device is enslaved to bonding, if ipv6 is active then addrconf will be initated on the slave (because it is closed then opened during the enslavement processing). This causes DAD and RS packets to be sent from the slave. These packets in turn can confuse switches that perform ipv6 snooping, causing them to incorrectly update their forwarding tables (if, e.g., the slave being added is an inactve backup that won't be used right away) and direct traffic away from the active slave to a backup slave (where the incoming packets will be dropped). This patch alters the behavior so that addrconf will only run on the master device itself. I believe this is logically correct, as it prevents slaves from having an IPv6 identity independent from the master. This is consistent with the IPv4 behavior for bonding. This is accomplished by (a) having bonding set IFF_SLAVE sooner in the enslavement processing than currently occurs (before open, not after), and (b) having ipv6 addrconf ignore UP and CHANGE events on slave devices. The eql driver also uses the IFF_SLAVE flag. I inspected eql, and I believe this change is reasonable for its usage of IFF_SLAVE, but I did not test it. Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/addrconf.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f96ed76d8fa..79b79f3de24 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2268,6 +2268,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
break;
case NETDEV_UP:
case NETDEV_CHANGE:
+ if (dev->flags & IFF_SLAVE)
+ break;
+
if (event == NETDEV_UP) {
if (!netif_carrier_ok(dev)) {
/* device is not ready yet. */