diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-02-20 01:05:26 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-22 06:07:10 +0300 |
| commit | 2f72959a9c1260ade234f353ccca91118151af66 (patch) | |
| tree | fdd08812be172d834752c55f580889256341e1a9 /include | |
| parent | 3697649ff29e0f647565eed04b27a7779c646a22 (diff) | |
| download | linux-2f72959a9c1260ade234f353ccca91118151af66.tar.xz | |
bpf: fix csum update in bpf_l4_csum_replace helper for udp
When using this helper for updating UDP checksums, we need to extend
this in order to write CSUM_MANGLED_0 for csum computations that result
into 0 as sum. Reason we need this is because packets with a checksum
could otherwise become incorrectly marked as a packet without a checksum.
Likewise, if the user indicates BPF_F_MARK_MANGLED_0, then we should
not turn packets without a checksum into ones with a checksum.
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 'include')
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 48d0a6c54609..6496f98d3d68 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -313,6 +313,7 @@ enum bpf_func_id { /* BPF_FUNC_l4_csum_replace flags. */ #define BPF_F_PSEUDO_HDR (1ULL << 4) +#define BPF_F_MARK_MANGLED_0 (1ULL << 5) /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ #define BPF_F_INGRESS (1ULL << 0) |