flow_keys: Record IP layer protocol in skb_flow_dissect()

skb_flow_dissect() dissects only transport header type in ip_proto. It dose not
give any information about IPv4 or IPv6.

This patch adds new member, n_proto, to struct flow_keys. Which records the
IP layer type. i.e IPv4 or IPv6.

This can be used in netdev->ndo_rx_flow_steer driver function to dissect flow.

Adding new member to flow_keys increases the struct size by around 4 bytes.
This causes BUILD_BUG_ON(sizeof(qcb->data) < sz); to fail in
qdisc_cb_private_validate()

So increase data size by 4

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/net/flow_keys.h b/include/net/flow_keys.h
index 7e64bd8bbda..fbefdca5e28 100644
--- a/include/net/flow_keys.h
+++ b/include/net/flow_keys.h
@@ -1,6 +1,19 @@
 #ifndef _NET_FLOW_KEYS_H
 #define _NET_FLOW_KEYS_H
 
+/* struct flow_keys:
+ *	@src: source ip address in case of IPv4
+ *	      For IPv6 it contains 32bit hash of src address
+ *	@dst: destination ip address in case of IPv4
+ *	      For IPv6 it contains 32bit hash of dst address
+ *	@ports: port numbers of Transport header
+ *		port16[0]: src port number
+ *		port16[1]: dst port number
+ *	@thoff: Transport header offset
+ *	@n_proto: Network header protocol (eg. IPv4/IPv6)
+ *	@ip_proto: Transport header protocol (eg. TCP/UDP)
+ * All the members, except thoff, are in network byte order.
+ */
 struct flow_keys {
 	/* (src,dst) must be grouped, in the same way than in IP header */
 	__be32 src;
@@ -10,6 +23,7 @@ struct flow_keys {
 		__be16 port16[2];
 	};
 	u16 thoff;
+	u16 n_proto;
 	u8 ip_proto;
 };