netdev - [PATCH net-next 2/3] bpf: allow disabling tunnel csum for ipv6

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Message-Id: <1512170770-7866-3-git-send-email-u9012063@gmail.com>
Date:   Fri,  1 Dec 2017 15:26:09 -0800
From:   William Tu <u9012063@...il.com>
To:     netdev@...r.kernel.org
Cc:     Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next 2/3] 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@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
---
 net/core/filter.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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;
 }
 
-- 
2.7.4