This is a note to let you know that I've just added the patch titled sit: do not confirm neighbor when do pmtu update to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sit-do-not-confirm-neighbor-when-do-pmtu-update.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Wed 01 Jan 2020 10:35:31 PM CET From: Hangbin Liu <liuhangbin@xxxxxxxxx> Date: Sun, 22 Dec 2019 10:51:15 +0800 Subject: sit: do not confirm neighbor when do pmtu update From: Hangbin Liu <liuhangbin@xxxxxxxxx> [ 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@xxxxxxxxxx> Acked-by: David Ahern <dsahern@xxxxxxxxx> Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/ipv6/sit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -944,7 +944,7 @@ static netdev_tx_t ipip6_tunnel_xmit(str } 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); Patches currently in stable-queue which might be from liuhangbin@xxxxxxxxx are queue-5.4/ipv6-addrconf-only-check-invalid-header-values-when-netlink_f_strict_chk-is-set.patch queue-5.4/sit-do-not-confirm-neighbor-when-do-pmtu-update.patch queue-5.4/net-dst-add-new-function-skb_dst_update_pmtu_no_confirm.patch queue-5.4/vti-do-not-confirm-neighbor-when-do-pmtu-update.patch queue-5.4/net-dst-do-not-confirm-neighbor-for-vxlan-and-geneve-pmtu-update.patch queue-5.4/gtp-do-not-confirm-neighbor-when-do-pmtu-update.patch queue-5.4/ip6_gre-do-not-confirm-neighbor-when-do-pmtu-update.patch queue-5.4/net-add-bool-confirm_neigh-parameter-for-dst_ops.update_pmtu.patch queue-5.4/tunnel-do-not-confirm-neighbor-when-do-pmtu-update.patch