This is a note to let you know that I've just added the patch titled tcp: fix mark propagation with fwmark_reflect enabled to the 4.4-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: tcp-fix-mark-propagation-with-fwmark_reflect-enabled.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@xxxxxxxxxxxxxxx> know about it. >From bf99b4ded5f8a4767dbb9d180626f06c51f9881f Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol <pespin.shar@xxxxxxxxx> Date: Fri, 6 Jan 2017 20:33:28 +0100 Subject: tcp: fix mark propagation with fwmark_reflect enabled From: Pau Espin Pedrol <pespin.shar@xxxxxxxxx> commit bf99b4ded5f8a4767dbb9d180626f06c51f9881f upstream. Otherwise, RST packets generated by the TCP stack for non-existing sockets always have mark 0. The mark from the original packet is assigned to the netns_ipv4/6 socket used to send the response so that it can get copied into the response skb when the socket sends it. Fixes: e110861f8609 ("net: add a sysctl to reflect the fwmark on replies") Cc: Lorenzo Colitti <lorenzo@xxxxxxxxxx> Signed-off-by: Pau Espin Pedrol <pau.espin@xxxxxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/ipv4/ip_output.c | 1 + net/ipv6/tcp_ipv6.c | 1 + 2 files changed, 2 insertions(+) --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -1592,6 +1592,7 @@ void ip_send_unicast_reply(struct sock * sk->sk_protocol = ip_hdr(skb)->protocol; sk->sk_bound_dev_if = arg->bound_dev_if; sk->sk_sndbuf = sysctl_wmem_default; + sk->sk_mark = fl4.flowi4_mark; err = ip_append_data(sk, &fl4, ip_reply_glue_bits, arg->iov->iov_base, len, 0, &ipc, &rt, MSG_DONTWAIT); if (unlikely(err)) { --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -822,6 +822,7 @@ static void tcp_v6_send_response(const s dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); if (!IS_ERR(dst)) { skb_dst_set(buff, dst); + ctl_sk->sk_mark = fl6.flowi6_mark; ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); if (rst) Patches currently in stable-queue which might be from pespin.shar@xxxxxxxxx are queue-4.4/tcp-fix-mark-propagation-with-fwmark_reflect-enabled.patch