[IPV6]: Restore IPv6 when MTU is big enough
authorEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Fri, 30 Nov 2007 12:36:08 +0000 (23:36 +1100)
committerHerbert Xu <herbert@gondor.apana.org.au>
Fri, 30 Nov 2007 12:36:08 +0000 (23:36 +1100)
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>
net/ipv6/addrconf.c

index 567664eac463633643ddd63735b304d3e5efa3f6..e8c347579da9a21f6d347b359ed2f28ad2218e43 100644 (file)
@@ -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: