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Commit b7b0b1d2 authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

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



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: default avatarAlexander Duyck <aduyck@mirantis.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ee625938

net/ipv6/addrconf.c

+27 −19
Original line number Diff line number Diff line
@@ -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:

		/*