From 61adedf3e3f1d3f032c5a6a299978d91eff6d555 Mon Sep 17 00:00:00 2001
From: Jiri Benc <jbenc@redhat.com>
Date: Thu, 20 Aug 2015 13:56:25 +0200
Subject: route: move lwtunnel state to dst_entry

Currently, the lwtunnel state resides in per-protocol data. This is
a problem if we encapsulate ipv6 traffic in an ipv4 tunnel (or vice versa).
The xmit function of the tunnel does not know whether the packet has been
routed to it by ipv4 or ipv6, yet it needs the lwtstate data. Moving the
lwtstate data to dst_entry makes such inter-protocol tunneling possible.

As a bonus, this brings a nice diffstat.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/core/dst.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'net/core/dst.c')

diff --git a/net/core/dst.c b/net/core/dst.c
index f8694d1b8702..50dcdbb0ee46 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -20,6 +20,7 @@
 #include <net/net_namespace.h>
 #include <linux/sched.h>
 #include <linux/prefetch.h>
+#include <net/lwtunnel.h>
 
 #include <net/dst.h>
 #include <net/dst_metadata.h>
@@ -184,6 +185,7 @@ void dst_init(struct dst_entry *dst, struct dst_ops *ops,
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	dst->tclassid = 0;
 #endif
+	dst->lwtstate = NULL;
 	atomic_set(&dst->__refcnt, initial_ref);
 	dst->__use = 0;
 	dst->lastuse = jiffies;
@@ -264,6 +266,7 @@ again:
 		kfree(dst);
 	else
 		kmem_cache_free(dst->ops->kmem_cachep, dst);
+	lwtstate_put(dst->lwtstate);
 
 	dst = child;
 	if (dst) {
-- 
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