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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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