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[IPV6]: Restore IPv6 when MTU is big enough

Browse source 
Avaid provided test application, so bug got fixed.

IPv6 addrconf removes ipv6 inner device from netdev each time cmu
changes and new value is less than IPV6_MIN_MTU (1280 bytes).
When mtu is changed and new value is greater than IPV6_MIN_MTU,
it does not add ipv6 addresses and inner device bac.

This patch fixes that.

Tested with Avaid's application, which works ok now.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Evgeniy Polyakov 2007-11-30 23:36:08 +11:00 committed by Herbert Xu
parent d5a784b371
commit d31c7b8fa3
1 changed files with 10 additions and 1 deletions
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11
net/ipv6/addrconf.c
View file

@ -2293,6 +2293,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
break; break;
} }
if (!idev && dev->mtu >= IPV6_MIN_MTU)
idev = ipv6_add_dev(dev);
if (idev) if (idev)
idev->if_flags |= IF_READY; idev->if_flags |= IF_READY;
} else { } else {
@ -2357,12 +2360,18 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
break; break;
case NETDEV_CHANGEMTU: case NETDEV_CHANGEMTU:
if ( idev && dev->mtu >= IPV6_MIN_MTU) { if (idev && dev->mtu >= IPV6_MIN_MTU) {
rt6_mtu_change(dev, dev->mtu); rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu; idev->cnf.mtu6 = dev->mtu;
break; break;
} }
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
if (idev)
break;
}
/* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
case NETDEV_DOWN: case NETDEV_DOWN: