ipv4: fix to not remove local route on link down
When fib_netdev_event calls fib_disable_ip on NETDEV_DOWN event
we should not delete the local routes if the local address
is still present. The confusion comes from the fact that both
fib_netdev_event and fib_inetaddr_event use the NETDEV_DOWN
constant. Fix it by returning back the variable 'force'.
Steps to reproduce:
modprobe dummy
ifconfig dummy0 192.168.168.1 up
ifconfig dummy0 down
ip route list table local | grep dummy | grep host
local 192.168.168.1 dev dummy0 proto kernel scope host src 192.168.168.1
Fixes: 8a3d03166f
("net: track link-status of ipv4 nexthops")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
5dbebbb44a
commit
4f823defdd
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@ -317,7 +317,7 @@ void fib_flush_external(struct net *net);
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/* Exported by fib_semantics.c */
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int ip_fib_check_default(__be32 gw, struct net_device *dev);
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int fib_sync_down_dev(struct net_device *dev, unsigned long event);
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int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
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int fib_sync_down_addr(struct net *net, __be32 local);
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int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
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void fib_select_multipath(struct fib_result *res);
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@ -1110,9 +1110,10 @@ static void nl_fib_lookup_exit(struct net *net)
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net->ipv4.fibnl = NULL;
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}
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static void fib_disable_ip(struct net_device *dev, unsigned long event)
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static void fib_disable_ip(struct net_device *dev, unsigned long event,
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bool force)
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{
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if (fib_sync_down_dev(dev, event))
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if (fib_sync_down_dev(dev, event, force))
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fib_flush(dev_net(dev));
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rt_cache_flush(dev_net(dev));
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arp_ifdown(dev);
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@ -1140,7 +1141,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
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/* Last address was deleted from this interface.
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* Disable IP.
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*/
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fib_disable_ip(dev, event);
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fib_disable_ip(dev, event, true);
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} else {
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rt_cache_flush(dev_net(dev));
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}
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@ -1157,7 +1158,7 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
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unsigned int flags;
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if (event == NETDEV_UNREGISTER) {
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fib_disable_ip(dev, event);
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fib_disable_ip(dev, event, true);
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rt_flush_dev(dev);
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return NOTIFY_DONE;
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}
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@ -1178,14 +1179,14 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
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rt_cache_flush(net);
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break;
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case NETDEV_DOWN:
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fib_disable_ip(dev, event);
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fib_disable_ip(dev, event, false);
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break;
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case NETDEV_CHANGE:
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flags = dev_get_flags(dev);
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if (flags & (IFF_RUNNING | IFF_LOWER_UP))
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fib_sync_up(dev, RTNH_F_LINKDOWN);
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else
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fib_sync_down_dev(dev, event);
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fib_sync_down_dev(dev, event, false);
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/* fall through */
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case NETDEV_CHANGEMTU:
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rt_cache_flush(net);
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@ -1281,7 +1281,13 @@ int fib_sync_down_addr(struct net *net, __be32 local)
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return ret;
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}
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int fib_sync_down_dev(struct net_device *dev, unsigned long event)
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/* Event force Flags Description
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* NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host
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* NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host
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* NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed
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* NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed
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*/
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int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force)
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{
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int ret = 0;
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int scope = RT_SCOPE_NOWHERE;
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@ -1290,8 +1296,7 @@ int fib_sync_down_dev(struct net_device *dev, unsigned long event)
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struct hlist_head *head = &fib_info_devhash[hash];
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struct fib_nh *nh;
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if (event == NETDEV_UNREGISTER ||
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event == NETDEV_DOWN)
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if (force)
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scope = -1;
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hlist_for_each_entry(nh, head, nh_hash) {
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