From a21831767092e8d36cd439606d6a10d64d0158ef Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <daniel@iogearbox.net>
Date: Fri, 23 Sep 2016 01:28:37 +0200
Subject: bpf: add helper to invalidate hash

Add a small helper that complements 36bbef52c7eb ("bpf: direct packet
write and access for helpers for clsact progs") for invalidating the
current skb->hash after mangling on headers via direct packet write.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
---
 include/uapi/linux/bpf.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'include/uapi/linux')

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index c2c5a0c9efd4..cb76c5f41352 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -484,6 +484,13 @@ enum bpf_func_id {
 	 */
 	BPF_FUNC_csum_update,
 
+	/**
+	 * bpf_set_hash_invalid(skb)
+	 * Invalidate current skb>hash.
+	 * @skb: pointer to skb
+	 */
+	BPF_FUNC_set_hash_invalid,
+
 	__BPF_FUNC_MAX_ID,
 };
 
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