lwtunnel: support dst output redirect function

This patch introduces lwtunnel_output function to call corresponding
lwtunnels output function to xmit the packet.

It adds two variants lwtunnel_output and lwtunnel_output6 for ipv4 and
ipv6 respectively today. But this is subject to change when lwtstate will
reside in dst or dst_metadata (as per upstream discussions).

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
index df24b3611ff4..918e03c1dafa 100644
--- a/include/net/lwtunnel.h
+++ b/include/net/lwtunnel.h
@@ -69,6 +69,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb,
 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
+int lwtunnel_output(struct sock *sk, struct sk_buff *skb);
+int lwtunnel_output6(struct sock *sk, struct sk_buff *skb);
 
 #else
 
@@ -127,6 +129,16 @@ static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
         return 0;
 }
 
+static inline int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int lwtunnel_output6(struct sock *sk, struct sk_buff *skb)
+{
+        return -EOPNOTSUPP;
+}
+
 #endif
 
 #endif /* __NET_LWTUNNEL_H */