This is a note to let you know that I've just added the patch titled
udp6: fix UDP/IPv6 encap resubmit path
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:
udp6-fix-udp-ipv6-encap-resubmit-path.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 foo@baz Sat Apr 16 10:02:53 PDT 2016
From: Bill Sommerfeld <wsommerfeld@xxxxxxxxxx>
Date: Fri, 4 Mar 2016 14:47:21 -0800
Subject: udp6: fix UDP/IPv6 encap resubmit path
From: Bill Sommerfeld <wsommerfeld@xxxxxxxxxx>
[ Upstream commit 59dca1d8a6725a121dae6c452de0b2611d5865dc ]
IPv4 interprets a negative return value from a protocol handler as a
request to redispatch to a new protocol. In contrast, IPv6 interprets a
negative value as an error, and interprets a positive value as a request
for redispatch.
UDP for IPv6 was unaware of this difference. Change __udp6_lib_rcv() to
return a positive value for redispatch. Note that the socket's
encap_rcv hook still needs to return a negative value to request
dispatch, and in the case of IPv6 packets, adjust IP6CB(skb)->nhoff to
identify the byte containing the next protocol.
Signed-off-by: Bill Sommerfeld <wsommerfeld@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/udp.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -916,11 +916,9 @@ int __udp6_lib_rcv(struct sk_buff *skb,
ret = udpv6_queue_rcv_skb(sk, skb);
sock_put(sk);
- /* a return value > 0 means to resubmit the input, but
- * it wants the return to be -protocol, or 0
- */
+ /* a return value > 0 means to resubmit the input */
if (ret > 0)
- return -ret;
+ return ret;
return 0;
}
Patches currently in stable-queue which might be from wsommerfeld@xxxxxxxxxx are
queue-4.4/udp6-fix-udp-ipv6-encap-resubmit-path.patch
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