sit: do not confirm neighbor when do pmtu update

[ Upstream commit 4d42df46d6372ece4cb4279870b46c2ea7304a47 ]

When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.

v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
    dst_ops.update_pmtu to control whether we should do neighbor confirm.
    Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 41b3fe8..bfed750 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -943,7 +943,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
                }
 
                if (tunnel->parms.iph.daddr)
-                       skb_dst_update_pmtu(skb, mtu);
+                       skb_dst_update_pmtu_no_confirm(skb, mtu);
 
                if (skb->len > mtu && !skb_is_gso(skb)) {
                        icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);