bpf: add bpf_get_hash_recalc helper

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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>

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Daniel Borkmann 2016-07-03 01:28:47 +02:00 • committed by David S. Miller

parent 6fd980ac39

commit 13c5c240f7

2 changed files with 28 additions and 0 deletions

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9

include/uapi/linux/bpf.h

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19

net/core/filter.c

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