Commit 0cb09aff authored by Ariel Levkovich's avatar Ariel Levkovich Committed by David S. Miller
Browse files

net/flow_dissector: add packet hash dissection 



Retreive a hash value from the SKB and store it
in the dissector key for future matching.

Signed-off-by: default avatarAriel Levkovich <lariel@mellanox.com>
Reviewed-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4a062d66

include/linux/skbuff.h

+4 −0
Original line number Diff line number Diff line
@@ -1342,6 +1342,10 @@ skb_flow_dissect_tunnel_info(const struct sk_buff *skb, 
			     struct flow_dissector *flow_dissector,

			     void *target_container);



void skb_flow_dissect_hash(const struct sk_buff *skb,

			   struct flow_dissector *flow_dissector,

			   void *target_container);



static inline __u32 skb_get_hash(struct sk_buff *skb)

{

	if (!skb->l4_hash && !skb->sw_hash)

include/net/flow_dissector.h

+9 −0
Original line number Diff line number Diff line
@@ -243,6 +243,14 @@ struct flow_dissector_key_ct { 
	u32	ct_labels[4];

};



/**

 * struct flow_dissector_key_hash:

 * @hash: hash value

 */

struct flow_dissector_key_hash {

	u32 hash;

};



enum flow_dissector_key_id {

	FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */

	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@@ -271,6 +279,7 @@ enum flow_dissector_key_id { 
	FLOW_DISSECTOR_KEY_ENC_OPTS, /* struct flow_dissector_key_enc_opts */

	FLOW_DISSECTOR_KEY_META, /* struct flow_dissector_key_meta */

	FLOW_DISSECTOR_KEY_CT, /* struct flow_dissector_key_ct */

	FLOW_DISSECTOR_KEY_HASH, /* struct flow_dissector_key_hash */



	FLOW_DISSECTOR_KEY_MAX,

};

net/core/flow_dissector.c

+17 −0
Original line number Diff line number Diff line
@@ -383,6 +383,23 @@ skb_flow_dissect_tunnel_info(const struct sk_buff *skb, 
}

EXPORT_SYMBOL(skb_flow_dissect_tunnel_info);



void skb_flow_dissect_hash(const struct sk_buff *skb,

			   struct flow_dissector *flow_dissector,

			   void *target_container)

{

	struct flow_dissector_key_hash *key;



	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_HASH))

		return;



	key = skb_flow_dissector_target(flow_dissector,

					FLOW_DISSECTOR_KEY_HASH,

					target_container);



	key->hash = skb_get_hash_raw(skb);

}

EXPORT_SYMBOL(skb_flow_dissect_hash);



static enum flow_dissect_ret

__skb_flow_dissect_mpls(const struct sk_buff *skb,

			struct flow_dissector *flow_dissector,