From: William Tu <u9012063@gmail.com>
Date: Fri, 1 Dec 2017 23:26:09 +0000 (-0800)
Subject: bpf: allow disabling tunnel csum for ipv6
X-Git-Tag: v4.16-rc1~123^2~434^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b8da518c6e87504a6790bfb1539134c41b61a45a;p=linux.git

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 6a85e67fafce..8ec5a504eb28 100644
--- 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;
 }