bpf: allow disabling tunnel csum for ipv6

Before the patch, BPF_F_ZERO_CSUM_TX can be used only for ipv4 tunnel.
With introduction of ip6gretap collect_md mode, the flag should be also
supported for ipv6.

Signed-off-by: William Tu <u9012063@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/filter.c b/net/core/filter.c
index 6a85e67..8ec5a50 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3026,10 +3026,11 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
                                  IPV6_FLOWLABEL_MASK;
        } else {
                info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
-               if (flags & BPF_F_ZERO_CSUM_TX)
-                       info->key.tun_flags &= ~TUNNEL_CSUM;
        }
 
+       if (flags & BPF_F_ZERO_CSUM_TX)
+               info->key.tun_flags &= ~TUNNEL_CSUM;
+
        return 0;
 }