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blackhole_netdev: use blackhole_netdev to invalidate dst entries 

Use blackhole_netdev instead of 'lo' device with lower MTU when marking
dst "dead".

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Tested-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar 2019-07-01 14:38:57 -07:00 committed by David S. Miller
parent 4de83b88c6
commit 8d7017fd62
3 changed files with 3 additions and 4 deletions
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2
net/core/dst.c
View File

@ -160,7 +160,7 @@ void dst_dev_put(struct dst_entry *dst)
dst->ops->ifdown(dst, dev, true); dst->ops->ifdown(dst, dev, true);
dst->input = dst_discard; dst->input = dst_discard;
dst->output = dst_discard_out; dst->output = dst_discard_out;
dst->dev = dev_net(dst->dev)->loopback_dev; dst->dev = blackhole_netdev;
dev_hold(dst->dev); dev_hold(dst->dev);
dev_put(dev); dev_put(dev);
} }

3
net/ipv4/route.c
View File

@ -1532,7 +1532,6 @@ static void ipv4_dst_destroy(struct dst_entry *dst)
void rt_flush_dev(struct net_device *dev) void rt_flush_dev(struct net_device *dev)
{ {
struct net *net = dev_net(dev);
struct rtable *rt; struct rtable *rt;
int cpu; int cpu;
@ -1543,7 +1542,7 @@ void rt_flush_dev(struct net_device *dev)
list_for_each_entry(rt, &ul->head, rt_uncached) { list_for_each_entry(rt, &ul->head, rt_uncached) {
if (rt->dst.dev != dev) if (rt->dst.dev != dev)
continue; continue;
rt->dst.dev = net->loopback_dev; rt->dst.dev = blackhole_netdev;
dev_hold(rt->dst.dev); dev_hold(rt->dst.dev);
dev_put(dev); dev_put(dev);
} }

2
net/ipv6/route.c
View File

@ -176,7 +176,7 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
} }
if (rt_dev == dev) { if (rt_dev == dev) {
rt->dst.dev = loopback_dev; rt->dst.dev = blackhole_netdev;
dev_hold(rt->dst.dev); dev_hold(rt->dst.dev);
dev_put(rt_dev); dev_put(rt_dev);
} }