ipv6: Add infrastructure to bind inet_peer objects to routes.

They are only allowed on cached ipv6 routes.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a0c4ad109c63..026caef0326c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -188,11 +188,29 @@ static void ip6_dst_destroy(struct dst_entry *dst)
 {
         struct rt6_info *rt = (struct rt6_info *)dst;
         struct inet6_dev *idev = rt->rt6i_idev;
+        struct inet_peer *peer = rt->rt6i_peer;
 
         if (idev != NULL) {
                 rt->rt6i_idev = NULL;
                 in6_dev_put(idev);
         }
+        if (peer) {
+                BUG_ON(!(rt->rt6i_flags & RTF_CACHE));
+                rt->rt6i_peer = NULL;
+                inet_putpeer(peer);
+        }
+}
+
+void rt6_bind_peer(struct rt6_info *rt, int create)
+{
+        struct inet_peer *peer;
+
+        if (WARN_ON(!(rt->rt6i_flags & RTF_CACHE)))
+                return;
+
+        peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create);
+        if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL)
+                inet_putpeer(peer);
 }
 
 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,