[PATCH v3 net-next 6/7] udp: UDP tunnel flow dissection infrastructure

[Tom Herbert]

Add infrastructure to allow UDP tunnels to setup flow dissecion.

Signed-off-by: Tom Herbert <t...@herbertland.com>
---
 include/net/udp_tunnel.h | 5 +++++
 net/ipv4/udp_tunnel.c    | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
index 02c5be0..81d2584 100644
--- a/include/net/udp_tunnel.h
+++ b/include/net/udp_tunnel.h
@@ -69,6 +69,10 @@ typedef struct sk_buff **(*udp_tunnel_gro_receive_t)(struct 
sock *sk,
                                                     struct sk_buff *skb);
 typedef int (*udp_tunnel_gro_complete_t)(struct sock *sk, struct sk_buff *skb,
                                         int nhoff);
+typedef int (*udp_tunnel_flow_dissect_t)(struct sock *sk,
+                                        const struct sk_buff *skb,
+                                        void *data, int hlen, int *nhoff,
+                                        u8 *ip_proto, __be16 *proto);
 
 struct udp_tunnel_sock_cfg {
        void *sk_user_data;     /* user data used by encap_rcv call back */
@@ -78,6 +82,7 @@ struct udp_tunnel_sock_cfg {
        udp_tunnel_encap_destroy_t encap_destroy;
        udp_tunnel_gro_receive_t gro_receive;
        udp_tunnel_gro_complete_t gro_complete;
+       udp_tunnel_flow_dissect_t flow_dissect;
 };
 
 /* Setup the given (UDP) sock to receive UDP encapsulated packets */
diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
index 58bd39f..4459288 100644
--- a/net/ipv4/udp_tunnel.c
+++ b/net/ipv4/udp_tunnel.c
@@ -72,6 +72,11 @@ void setup_udp_tunnel_sock(struct net *net, struct socket 
*sock,
        udp_sk(sk)->gro_receive = cfg->gro_receive;
        udp_sk(sk)->gro_complete = cfg->gro_complete;
 
+       if (cfg->flow_dissect) {
+               udp_sk(sk)->flow_dissect = cfg->flow_dissect;
+               udp_flow_dissect_enable();
+       }
+
        udp_tunnel_encap_enable(sock);
 }
 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
-- 
2.9.3