From: Daniel Borkmann <dan...@iogearbox.net>
Date: Tue, 23 Feb 2016 02:05:26 +0100
> The fix in 35e2d1152b22 ("tunnels: Allow IPv6 UDP checksums to be correctly
> controlled.") changed behavior for bpf_set_tunnel_key() when in use with
> IPv6 and thus uncovered a bug that TUNNEL_CSUM needed to be set but wasn't.
> As a result, the stack dropped ingress vxlan IPv6 packets, that have been
> sent via eBPF through collect meta data mode due to checksum now being zero.
>
> Since after LCO, we enable IPv4 checksum by default, so make that analogous
> and only provide a flag BPF_F_ZERO_CSUM_TX for the user to turn it off in
> IPv4 case.
>
> Fixes: 35e2d1152b22 ("tunnels: Allow IPv6 UDP checksums to be correctly
> controlled.")
> Fixes: c6c33454072f ("bpf: support ipv6 for bpf_skb_{set,get}_tunnel_key")
> Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
> Acked-by: Alexei Starovoitov <a...@kernel.org>
Applied to 'net', thanks Daniel.
