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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: Ariel Levkovich <lariel@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ariel Levkovich 2020-07-23 01:03:00 +03:00 committed by David S. Miller
parent 4a062d66b5
commit 0cb09aff9d
3 changed files with 30 additions and 0 deletions
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4
include/linux/skbuff.h
View File

@ -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)

9
include/net/flow_dissector.h
View File

@ -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,
};

17
net/core/flow_dissector.c
View File

@ -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,