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ipv: Re-enable IP when MTU > 68 

Re-enable IP when the MTU gets back to a valid size. 

This patch just checks if the in_dev is NULL on a NETDEV_CHANGEMTU event
and if MTU is valid (bigger than 68), then re-enable in_dev. 

Also a function that checks valid MTU size was created.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Breno Leitao 2008-09-02 17:28:58 -07:00 committed by David S. Miller
parent 9d7d74029e
commit 06770843c2
1 changed files with 12 additions and 3 deletions
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15
net/ipv4/devinet.c
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@ -1029,6 +1029,11 @@ skip:
}
}
static inline bool inetdev_valid_mtu(unsigned mtu)
{
return mtu >= 68;
}
/* Called only under RTNL semaphore */
static int inetdev_event(struct notifier_block *this, unsigned long event,
@ -1048,6 +1053,10 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
}
} else if (event == NETDEV_CHANGEMTU) {
/* Re-enabling IP */
if (inetdev_valid_mtu(dev->mtu))
in_dev = inetdev_init(dev);
}
goto out;
}
@ -1058,7 +1067,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
dev->ip_ptr = NULL;
break;
case NETDEV_UP:
if (dev->mtu < 68)
if (!inetdev_valid_mtu(dev->mtu))
break;
if (dev->flags & IFF_LOOPBACK) {
struct in_ifaddr *ifa;
@ -1080,9 +1089,9 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
ip_mc_down(in_dev);
break;
case NETDEV_CHANGEMTU:
if (dev->mtu >= 68)
if (inetdev_valid_mtu(dev->mtu))
break;
/* MTU falled under 68, disable IP */
/* disable IP when MTU is not enough */
case NETDEV_UNREGISTER:
inetdev_destroy(in_dev);
break;