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ipv6: recreate ipv6 link-local addresses when increasing MTU over IPV6_MIN_MTU

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This change makes it so that we reinitialize the interface if the MTU is
increased back above IPV6_MIN_MTU and the interface is up.

Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2015-10-26 11:06:33 -07:00 committed by David S. Miller
parent ee6259382c
commit b7b0b1d290
1 changed files with 27 additions and 19 deletions
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46
net/ipv6/addrconf.c
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@ -3147,6 +3147,32 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
}
break;
case NETDEV_CHANGEMTU:
/* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
if (dev->mtu < IPV6_MIN_MTU) {
addrconf_ifdown(dev, 1);
break;
}
if (idev) {
rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu;
break;
}
/* allocate new idev */
idev = ipv6_add_dev(dev);
if (IS_ERR(idev))
break;
/* device is still not ready */
if (!(idev->if_flags & IF_READY))
break;
run_pending = 1;
/* fall through */
case NETDEV_UP:
case NETDEV_CHANGE:
if (dev->flags & IFF_SLAVE)
@ -3170,7 +3196,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
idev->if_flags |= IF_READY;
run_pending = 1;
}
} else {
} else if (event == NETDEV_CHANGE) {
if (!addrconf_qdisc_ok(dev)) {
/* device is still not ready. */
break;
@ -3235,24 +3261,6 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
}
break;
case NETDEV_CHANGEMTU:
if (idev && dev->mtu >= IPV6_MIN_MTU) {
rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu;
break;
}
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
if (!IS_ERR(idev))
break;
}
/*
* if MTU under IPV6_MIN_MTU.
* Stop IPv6 on this interface.
*/
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
/*