This patch causes the proper attribute flags to be set,
in the case that IPv6 UDP checksums are disabled, so that
userspace ie. `ip l2tp show tunnel` knows about it.

Signed-off-by: Asbjoern Sloth Toennesen <asbj...@asbjorn.st>
---
 net/l2tp/l2tp_netlink.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index e45c5409..1b3fcde 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -385,6 +385,16 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 
portid, u32 seq, int fla
                            nla_put_flag(skb, L2TP_ATTR_UDP_CSUM))
                                goto nla_put_failure;
                        break;
+#if IS_ENABLED(CONFIG_IPV6)
+               case AF_INET6:
+                       if (udp_get_no_check6_tx(sk) &&
+                           nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
+                               goto nla_put_failure;
+                       if (udp_get_no_check6_rx(sk) &&
+                           nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
+                               goto nla_put_failure;
+                       break;
+#endif
                }
                if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, 
ntohs(inet->inet_sport)) ||
                    nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, 
ntohs(inet->inet_dport)))
-- 
2.10.1

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