Commit 4a6ce2b6 authored by Wei Wang's avatar Wei Wang Committed by David S. Miller

net: introduce a new function dst_dev_put()

This function should be called when removing routes from fib tree after
the dst gc is no longer in use.
We first mark DST_OBSOLETE_DEAD on this dst to make sure next
dst_ops->check() fails and returns NULL.
Secondly, as we no longer keep the gc_list, we need to properly
release dst->dev right at the moment when the dst is removed from
the fib/fib6 tree.
It does the following:
1. change dst->input and output pointers to dst_discard/dst_dscard_out to
   discard all packets
2. replace dst->dev with loopback interface
Signed-off-by: default avatarWei Wang <[email protected]>
Acked-by: default avatarMartin KaFai Lau <[email protected]>
Signed-off-by: default avatarDavid S. Miller <[email protected]>
parent 5f56f409
......@@ -428,6 +428,7 @@ void dst_init(struct dst_entry *dst, struct dst_ops *ops,
unsigned short flags);
void __dst_free(struct dst_entry *dst);
struct dst_entry *dst_destroy(struct dst_entry *dst);
void dst_dev_put(struct dst_entry *dst);
static inline void dst_free(struct dst_entry *dst)
......@@ -296,6 +296,30 @@ static void dst_destroy_rcu(struct rcu_head *head)
/* Operations to mark dst as DEAD and clean up the net device referenced
* by dst:
* 1. put the dst under loopback interface and discard all tx/rx packets
* on this route.
* 2. release the net_device
* This function should be called when removing routes from the fib tree
* in preparation for a NETDEV_DOWN/NETDEV_UNREGISTER event and also to
* make the next dst_ops->check() fail.
void dst_dev_put(struct dst_entry *dst)
struct net_device *dev = dst->dev;
dst->obsolete = DST_OBSOLETE_DEAD;
if (dst->ops->ifdown)
dst->ops->ifdown(dst, dev, true);
dst->input = dst_discard;
dst->output = dst_discard_out;
dst->dev = dev_net(dst->dev)->loopback_dev;
void dst_release(struct dst_entry *dst)
if (dst) {
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