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authorDaniel Borkmann <daniel@iogearbox.net>2016-03-04 15:15:03 +0100
committerDavid S. Miller <davem@davemloft.net>2016-03-08 13:55:15 -0500
commit8afd54c87ad7089734ef0527937a256586ba828a (patch)
tree9566535cb2d9ce1cecb2926581f1c3b76577f11a /net/core
parent8050c0f0274a15841756968857cfb07b3ab809ae (diff)
bpf: add flags to bpf_skb_store_bytes for clearing hash
When overwriting parts of the packet with bpf_skb_store_bytes() that were fed previously into skb->hash calculation, we should clear the current hash with skb_clear_hash(), so that a next skb_get_hash() call can determine the correct hash related to this skb. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/filter.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 356a251657a5..a1fe246a6147 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1353,7 +1353,7 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
unsigned int len = (unsigned int) r4;
void *ptr;
- if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM)))
+ if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
return -EINVAL;
/* bpf verifier guarantees that:
@@ -1384,6 +1384,8 @@ static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
if (flags & BPF_F_RECOMPUTE_CSUM)
skb_postpush_rcsum(skb, ptr, len);
+ if (flags & BPF_F_INVALIDATE_HASH)
+ skb_clear_hash(skb);
return 0;
}