xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net: track link-status of ipv4 nexthops

Browse Source 
Add a fib flag called RTNH_F_LINKDOWN to any ipv4 nexthops that are
reachable via an interface where carrier is off.  No action is taken,
but additional flags are passed to userspace to indicate carrier status.

This also includes a cleanup to fib_disable_ip to more clearly indicate
what event made the function call to replace the more cryptic force
option previously used.

v2: Split out kernel functionality into 2 patches, this patch simply
sets and clears new nexthop flag RTNH_F_LINKDOWN.

v3: Cleanups suggested by Alex as well as a bug noticed in
fib_sync_down_dev and fib_sync_up when multipath was not enabled.

v5: Whitespace and variable declaration fixups suggested by Dave.

v6: Style fixups noticed by Dave; ran checkpatch to be sure I got them
all.

Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Gospodarek
2015-06-23 13:45:36 -04:00
committed by David S. Miller
parent 5c8079d049
commit 8a3d03166f
4 changed files with 67 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
net/ipv4/fib_frontend.c
View File

@@ -1063,9 +1063,9 @@ static void nl_fib_lookup_exit(struct net *net)
net->ipv4.fibnl = NULL;
}
static void fib_disable_ip(struct net_device *dev, int force)
static void fib_disable_ip(struct net_device *dev, unsigned long event)
{
if (fib_sync_down_dev(dev, force))
if (fib_sync_down_dev(dev, event))
fib_flush(dev_net(dev));
rt_cache_flush(dev_net(dev));
arp_ifdown(dev);
@@ -1081,7 +1081,7 @@ static int fib_inetaddr_event(struct notifier_block *this, unsigned long event,
case NETDEV_UP:
fib_add_ifaddr(ifa);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
fib_sync_up(dev);
fib_sync_up(dev, RTNH_F_DEAD);
#endif
atomic_inc(&net->ipv4.dev_addr_genid);
rt_cache_flush(dev_net(dev));
@@ -1093,7 +1093,7 @@ 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, 1);
fib_disable_ip(dev, event);
} else {
rt_cache_flush(dev_net(dev));
}
@@ -1107,9 +1107,10 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct in_device *in_dev;
struct net *net = dev_net(dev);
unsigned int flags;
if (event == NETDEV_UNREGISTER) {
fib_disable_ip(dev, 2);
fib_disable_ip(dev, event);
rt_flush_dev(dev);
return NOTIFY_DONE;
}
@@ -1124,16 +1125,22 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
fib_add_ifaddr(ifa);
} endfor_ifa(in_dev);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
fib_sync_up(dev);
fib_sync_up(dev, RTNH_F_DEAD);
#endif
atomic_inc(&net->ipv4.dev_addr_genid);
rt_cache_flush(net);
break;
case NETDEV_DOWN:
fib_disable_ip(dev, 0);
fib_disable_ip(dev, event);
break;
case NETDEV_CHANGEMTU:
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);
/* fall through */
case NETDEV_CHANGEMTU:
rt_cache_flush(net);
break;
}