This is a note to let you know that I've just added the patch titled

ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Nov 16 15:08:14 CET 2017

From: Xin Long lucien.xin@gmail.com Date: Thu, 26 Oct 2017 19:23:27 +0800 Subject: ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err

From: Xin Long lucien.xin@gmail.com

[ Upstream commit f8d20b46ce55cf40afb30dcef6d9288f7ef46d9b ]

The similar fix in patch 'ipip: only increase err_count for some certain type icmp in ipip_err' is needed for ip6gre_err.

In Jianlin's case, udp netperf broke even when receiving a TooBig icmpv6 packet.

Fixes: c12b395a4664 ("gre: Support GRE over IPv6") Reported-by: Jianlin Shi jishi@redhat.com Signed-off-by: Xin Long lucien.xin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/ip6_gre.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)

--- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -409,13 +409,16 @@ static void ip6gre_err(struct sk_buff *s case ICMPV6_DEST_UNREACH: net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", t->parms.name); - break; + if (code != ICMPV6_PORT_UNREACH) + break; + return; case ICMPV6_TIME_EXCEED: if (code == ICMPV6_EXC_HOPLIMIT) { net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", t->parms.name); + break; } - break; + return; case ICMPV6_PARAMPROB: teli = 0; if (code == ICMPV6_HDR_FIELD) @@ -431,13 +434,13 @@ static void ip6gre_err(struct sk_buff *s net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", t->parms.name); } - break; + return; case ICMPV6_PKT_TOOBIG: mtu = be32_to_cpu(info) - offset; if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; t->dev->mtu = mtu; - break; + return; }

if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))

Patches currently in stable-queue which might be from lucien.xin@gmail.com are

queue-4.4/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.4/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.4/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch