This is a note to let you know that I've just added the patch titled
net: ipv6: tcp reset, icmp need to consider L3 domain
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:
net-ipv6-tcp-reset-icmp-need-to-consider-l3-domain.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 1d2f7b2d956e242179aaf4a08f3545f99c81f9a3 Mon Sep 17 00:00:00 2001
From: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 4 May 2016 21:26:08 -0700
Subject: net: ipv6: tcp reset, icmp need to consider L3 domain
From: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
commit 1d2f7b2d956e242179aaf4a08f3545f99c81f9a3 upstream.
Responses for packets to unused ports are getting lost with L3 domains.
IPv4 has ip_send_unicast_reply for sending TCP responses which accounts
for L3 domains; update the IPv6 counterpart tcp_v6_send_response.
For icmp the L3 master check needs to be moved up in icmp6_send
to properly respond to UDP packets to a port with no listener.
Fixes: ca254490c8df ("net: Add VRF support to IPv6 stack")
Signed-off-by: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/icmp.c | 5 ++---
net/ipv6/tcp_ipv6.c | 7 ++++++-
2 files changed, 8 insertions(+), 4 deletions(-)
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -445,6 +445,8 @@ static void icmp6_send(struct sk_buff *s
if (__ipv6_addr_needs_scope_id(addr_type))
iif = skb->dev->ifindex;
+ else
+ iif = l3mdev_master_ifindex(skb->dev);
/*
* Must not send error if the source does not uniquely
@@ -499,9 +501,6 @@ static void icmp6_send(struct sk_buff *s
else if (!fl6.flowi6_oif)
fl6.flowi6_oif = np->ucast_oif;
- if (!fl6.flowi6_oif)
- fl6.flowi6_oif = l3mdev_master_ifindex(skb->dev);
-
dst = icmpv6_route_lookup(net, skb, sk, &fl6);
if (IS_ERR(dst))
goto out;
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -815,8 +815,13 @@ static void tcp_v6_send_response(const s
fl6.flowi6_proto = IPPROTO_TCP;
if (rt6_need_strict(&fl6.daddr) && !oif)
fl6.flowi6_oif = tcp_v6_iif(skb);
- else
+ else {
+ if (!oif && netif_index_is_l3_master(net, skb->skb_iif))
+ oif = skb->skb_iif;
+
fl6.flowi6_oif = oif;
+ }
+
fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark);
fl6.fl6_dport = t1->dest;
fl6.fl6_sport = t1->source;
Patches currently in stable-queue which might be from dsa@xxxxxxxxxxxxxxxxxxx are
queue-4.4/net-ipv6-tcp-reset-icmp-need-to-consider-l3-domain.patch
