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net: Add functions to get skb->hash based on flow structures

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Add skb_get_hash_flowi6 and skb_get_hash_flowi4 which derive an sk_buff
hash from flowi6 and flowi4 structures respectively. These functions
can be called when creating a packet in the output path where the new
sk_buff does not yet contain a fully formed packet that is parsable by
flow dissector.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2015-07-31 16:52:10 -07:00
committed by David S. Miller
parent db316d57b6
commit f70ea018da
2 changed files with 75 additions and 4 deletions
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21
include/linux/skbuff.h
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@@ -37,6 +37,7 @@
#include <net/flow_dissector.h>
#include <linux/splice.h>
#include <linux/in6.h>
#include <net/flow.h>
/* A. Checksumming of received packets by device.
*
@@ -945,6 +946,26 @@ static inline __u32 skb_get_hash(struct sk_buff *skb)
return skb->hash;
}
__u32 __skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6);
static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6)
{
if (!skb->l4_hash && !skb->sw_hash)
__skb_get_hash_flowi6(skb, fl6);
return skb->hash;
}
__u32 __skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl);
static inline __u32 skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl4)
{
if (!skb->l4_hash && !skb->sw_hash)
__skb_get_hash_flowi4(skb, fl4);
return skb->hash;
}
__u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb);
static inline __u32 skb_get_hash_raw(const struct sk_buff *skb)