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Date: Fri, 29 Aug 2008 11:53:31 -0300
From: Breno Leitao <leitao@...ux.vnet.ibm.com>
To: David Miller <davem@...emloft.net>
CC: netdev <netdev@...r.kernel.org>, Lorandi <rafaello@...ibm.com>
Subject: [PATCH 1/1 net-2.6] Re-enable IP when MTU > 68
Actually if you run "ifconfig ethX mtu 56; ifconfig ethX mtu 1500",
then your interface will get corrupted. On an attempt to assign an IP
to the interface, it'll result in:
SIOCSIFADDR: No buffer space available
This happens because when decreasing the MTU under 68, it'll destroy the
in_dev reference forever, even after getting MTU higher than 68 bytes.
This patch just checks if the in_dev is NULL on a NETDEV_CHANGEMTU event
and if MTU is bigger than 68, then re-enable in_dev
Signed-off-by: Breno Leitao <leitao@...ux.vnet.ibm.com>
---
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 91d3d96..758b4f6 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1048,6 +1048,10 @@ 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 (dev->mtu > 68)
+ in_dev = inetdev_init(dev);
}
goto out;
}
--
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