Messages in this thread Patch in this message | | | Date | Wed, 12 Dec 2007 22:35:14 -0800 | From | Greg KH <> | Subject | [patch 27/36] IPV6: Restore IPv6 when MTU is big enough |
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2.6.22-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 @@ -2285,6 +2285,9 @@ 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 { @@ -2349,12 +2352,18 @@ 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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