tree ecf47dfa74f483b539c325e1b95d3772e38e0107
parent 6fd980ac39efee9c26b1eb256c3271fcb139bd99
author Daniel Borkmann <daniel@iogearbox.net> 1467502127 +0200
committer David S. Miller <davem@davemloft.net> 1467673720 -0700

bpf: add bpf_get_hash_recalc helper

If skb_clear_hash() was invoked due to mangling of relevant headers and
BPF program needs skb->hash later on, we can add a helper to trigger hash
recalculation via bpf_get_hash_recalc().

The helper will return the newly retrieved hash directly, but later access
can also be done via skb context again through skb->hash directly (inline)
without needing to call the helper once more.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>