diff options
| author | Alexander Duyck <aduyck@mirantis.com> | 2015-10-26 11:06:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-30 18:11:07 +0900 |
| commit | b7b0b1d290cc89c39607dd47f8047e1071e65692 (patch) | |
| tree | 0a57a84f11635f90ffe6b5f4496422b2670b0247 /net/ipv6/addrconf.c | |
| parent | ee6259382ca8f723a2cc90841f903667c7720584 (diff) | |
| download | lwn-b7b0b1d290cc89c39607dd47f8047e1071e65692.tar.gz lwn-b7b0b1d290cc89c39607dd47f8047e1071e65692.zip | |
ipv6: recreate ipv6 link-local addresses when increasing MTU over IPV6_MIN_MTU
This change makes it so that we reinitialize the interface if the MTU is
increased back above IPV6_MIN_MTU and the interface is up.
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 46 |
1 files changed, 27 insertions, 19 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index d0c685cdc345..d72fa90d6feb 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3147,6 +3147,32 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, } break; + case NETDEV_CHANGEMTU: + /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ + if (dev->mtu < IPV6_MIN_MTU) { + addrconf_ifdown(dev, 1); + break; + } + + if (idev) { + rt6_mtu_change(dev, dev->mtu); + idev->cnf.mtu6 = dev->mtu; + break; + } + + /* allocate new idev */ + idev = ipv6_add_dev(dev); + if (IS_ERR(idev)) + break; + + /* device is still not ready */ + if (!(idev->if_flags & IF_READY)) + break; + + run_pending = 1; + + /* fall through */ + case NETDEV_UP: case NETDEV_CHANGE: if (dev->flags & IFF_SLAVE) @@ -3170,7 +3196,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, idev->if_flags |= IF_READY; run_pending = 1; } - } else { + } else if (event == NETDEV_CHANGE) { if (!addrconf_qdisc_ok(dev)) { /* device is still not ready. */ break; @@ -3235,24 +3261,6 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, } break; - case NETDEV_CHANGEMTU: - 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 (!IS_ERR(idev)) - break; - } - - /* - * if MTU under IPV6_MIN_MTU. - * Stop IPv6 on this interface. - */ - case NETDEV_DOWN: case NETDEV_UNREGISTER: /* |