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Subject[patch 52/60] IPV6: Restore IPv6 when MTU is big enough

2.6.23-stable review patch. If anyone has any objections, please let us
know.

------------------
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
[IPV6]: Restore IPv6 when MTU is big enough

[ Upstream commit: d31c7b8fa303eb81311f27b80595b8d2cbeef950 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
net/ipv6/addrconf.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2281,6 +2281,9 @@ static int addrconf_notify(struct notifi
break;
}

+ if (!idev && dev->mtu >= IPV6_MIN_MTU)
+ idev = ipv6_add_dev(dev);
+
if (idev)
idev->if_flags |= IF_READY;
} else {
@@ -2345,12 +2348,18 @@ static int addrconf_notify(struct notifi
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:
--


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