From: Wei Wang <weiwan@google.com>
Date: Sat, 17 Jun 2017 10:42:28 -0700
Subject: net: introduce a new function dst_dev_put()
Patch-mainline: v4.13-rc1
Git-commit: 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36
References: bsc#1061739

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: Wei Wang <weiwan@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Kubecek <mkubecek@suse.cz>

---
 include/net/dst.h |  1 +
 net/core/dst.c    | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/net/dst.h b/include/net/dst.h
index dfe02acaa05f..12a54cfead4f 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -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)
 {
diff --git a/net/core/dst.c b/net/core/dst.c
index fb5c780eea24..3942df39bf52 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -296,6 +296,30 @@ static void dst_destroy_rcu(struct rcu_head *head)
 		__dst_free(dst);
 }
 
+/* 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;
+	dev_hold(dst->dev);
+	dev_put(dev);
+}
+EXPORT_SYMBOL(dst_dev_put);
+
 void dst_release(struct dst_entry *dst)
 {
 	if (dst) {
-- 
2.14.2