This is a note to let you know that I've just added the patch titled
6lowpan: Uncompression of traffic class field was
to the 3.12-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:
6lowpan-uncompression-of-traffic-class-field-was.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Thu Dec 5 16:16:38 PST 2013
From: Jukka Rissanen <[email protected]>
Date: Wed, 13 Nov 2013 11:03:39 +0200
Subject: 6lowpan: Uncompression of traffic class field was
incorrect
From: Jukka Rissanen <[email protected]>
[ Upstream commit 1188f05497e7bd2f2614b99c54adfbe7413d5749 ]
If priority/traffic class field in IPv6 header is set (seen when
using ssh), the uncompression sets the TC and Flow fields incorrectly.
Example:
This is IPv6 header of a sent packet. Note the priority/TC (=1) in
the first byte.
00000000: 61 00 00 00 00 2c 06 40 fe 80 00 00 00 00 00 00
00000010: 02 02 72 ff fe c6 42 10 fe 80 00 00 00 00 00 00
00000020: 02 1e ab ff fe 4c 52 57
This gets compressed like this in the sending side
00000000: 72 31 04 06 02 1e ab ff fe 4c 52 57 ec c2 00 16
00000010: aa 2d fe 92 86 4e be c6 ....
In the receiving end, the packet gets uncompressed to this
IPv6 header
00000000: 60 06 06 02 00 2a 1e 40 fe 80 00 00 00 00 00 00
00000010: 02 02 72 ff fe c6 42 10 fe 80 00 00 00 00 00 00
00000020: ab ff fe 4c 52 57 ec c2
First four bytes are set incorrectly and we have also lost
two bytes from destination address.
The fix is to switch the case values in switch statement
when checking the TC field.
Signed-off-by: Jukka Rissanen <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ieee802154/6lowpan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -957,7 +957,7 @@ lowpan_process_data(struct sk_buff *skb)
* Traffic class carried in-line
* ECN + DSCP (1 byte), Flow Label is elided
*/
- case 1: /* 10b */
+ case 2: /* 10b */
if (lowpan_fetch_skb_u8(skb, &tmp))
goto drop;
@@ -968,7 +968,7 @@ lowpan_process_data(struct sk_buff *skb)
* Flow Label carried in-line
* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
*/
- case 2: /* 01b */
+ case 1: /* 01b */
if (lowpan_fetch_skb_u8(skb, &tmp))
goto drop;
Patches currently in stable-queue which might be from
[email protected] are
queue-3.12/6lowpan-uncompression-of-traffic-class-field-was.patch
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