netdev - Re: BUG REPORT: iproute2 seems to have bug with dsfield/tos in ip-rule and ip-route

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Date:   Wed, 13 Dec 2017 11:05:55 -0800
From:   Daniel Lakeland <dlakelan@...eet-artists.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: BUG REPORT: iproute2 seems to have bug with dsfield/tos in
 ip-rule and ip-route

Following up my previous email with output from the machine:
Note that like some of those other people I was able to get ip rule to 
accept tos values with just low order bits set

Here is example of how ip rule accepts low order dsfield bits but not modern DSCP type bits, also including some version info

dlakelan@...gpong:~$ sudo ip rule add dsfield 0x0c table 100
dlakelan@...gpong:~$ ip rule show
0:	from all lookup local
32765:	from all tos 0x0c lookup 100
32766:	from all lookup main
32767:	from all lookup default


dlakelan@...gpong:~$ sudo ip rule add dsfield 0xc0 table 100
RTNETLINK answers: Invalid argument


dlakelan@...gpong:~$ cat /proc/version
Linux version 4.12.0-1-amd64 (debian-kernel@...ts.debian.org) (gcc version 6.4.0 20170805 (Debian 6.4.0-3) ) #1 SMP Debian 4.12.6-1 (2017-08-12)


dlakelan@...gpong:~$ ip -V
ip utility, iproute2-ss160518