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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:
Julian Anastasov 2015-10-30 10:23:33 +02:00 committed by David S. Miller
parent 5dbebbb44a
commit 4f823defdd
3 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ip_fib.h
View File

@ -317,7 +317,7 @@ void fib_flush_external(struct net *net);
/* Exported by fib_semantics.c */
int ip_fib_check_default(__be32 gw, struct net_device *dev);
int fib_sync_down_dev(struct net_device *dev, unsigned long event);
int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
int fib_sync_down_addr(struct net *net, __be32 local);
int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
void fib_select_multipath(struct fib_result *res);

13
net/ipv4/fib_frontend.c
View File

@ -1110,9 +1110,10 @@ static void nl_fib_lookup_exit(struct net *net)
net->ipv4.fibnl = NULL;
}
static void fib_disable_ip(struct net_device *dev, unsigned long event)
static void fib_disable_ip(struct net_device *dev, unsigned long event,
bool force)
{
if (fib_sync_down_dev(dev, event))
if (fib_sync_down_dev(dev, event, force))
fib_flush(dev_net(dev));
rt_cache_flush(dev_net(dev));
arp_ifdown(dev);
@ -1140,7 +1141,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
/* Last address was deleted from this interface.
* Disable IP.
*/
fib_disable_ip(dev, event);
fib_disable_ip(dev, event, true);
} else {
rt_cache_flush(dev_net(dev));
}
@ -1157,7 +1158,7 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
unsigned int flags;
if (event == NETDEV_UNREGISTER) {
fib_disable_ip(dev, event);
fib_disable_ip(dev, event, true);
rt_flush_dev(dev);
return NOTIFY_DONE;
}
@ -1178,14 +1179,14 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
rt_cache_flush(net);
break;
case NETDEV_DOWN:
fib_disable_ip(dev, event);
fib_disable_ip(dev, event, false);
break;
case NETDEV_CHANGE:
flags = dev_get_flags(dev);
if (flags & (IFF_RUNNING | IFF_LOWER_UP))
fib_sync_up(dev, RTNH_F_LINKDOWN);
else
fib_sync_down_dev(dev, event);
fib_sync_down_dev(dev, event, false);
/* fall through */
case NETDEV_CHANGEMTU:
rt_cache_flush(net);

11
net/ipv4/fib_semantics.c
View File

@ -1281,7 +1281,13 @@ int fib_sync_down_addr(struct net *net, __be32 local)
return ret;
}
int fib_sync_down_dev(struct net_device *dev, unsigned long event)
/* Event force Flags Description
* NETDEV_CHANGE 0 LINKDOWN Carrier OFF, not for scope host
* NETDEV_DOWN 0 LINKDOWN|DEAD Link down, not for scope host
* NETDEV_DOWN 1 LINKDOWN|DEAD Last address removed
* NETDEV_UNREGISTER 1 LINKDOWN|DEAD Device removed
*/
int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force)
{
int ret = 0;
int scope = RT_SCOPE_NOWHERE;
@ -1290,8 +1296,7 @@ int fib_sync_down_dev(struct net_device *dev, unsigned long event)
struct hlist_head *head = &fib_info_devhash[hash];
struct fib_nh *nh;
if (event == NETDEV_UNREGISTER ||
event == NETDEV_DOWN)
if (force)
scope = -1;
hlist_for_each_entry(nh, head, nh_hash) {