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[IPV6]: Restore IPv6 when MTU is big enough

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