You have been subscribed to a public bug:
Attn. Canonical: Please make sure that the existing iproute2 package
gets updated with the two referenced patches as the missing information
is impacting our standard test suites.
Thanks.
== Comment: #0 - Alton L. Pundt - 2017-03-29 14:37:57 ==
---Problem Description---
ip maddr show and ip maddr show dev enP20p96s0 show different data
---uname output---
Linux roselp1 4.10.0-14-generic #16-Ubuntu SMP Fri Mar 17 15:19:05 UTC 2017
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8286-42A
---Steps to Reproduce---
run these at command line:
root@roselp1:~# ip maddr show
...
10: enP20p96s0
link 33:33:00:00:00:01
link 01:00:5e:00:00:01
link 33:33:ff:6d:d0:d0
link 01:00:5e:00:00:fc
link 33:33:00:01:00:03
inet 224.0.0.252
inet 224.0.0.1
inet6 ff02::1:3
inet6 ff02::1:ff6d:d0d0 users 3
inet6 ff02::1
inet6 ff01::1
...
root@roselp1:~# ip maddr show dev enP20p96s0
10: enP20p96s0
link 33:33:00:00:00:01
link 01:00:5e:00:00:01
link 33:33:ff:6d:d0:d0
link 01:00:5e:00:00:fc
link 33:33:00:01:00:03
inet6 ff02::1:3
inet6 ff02::1:ff6d:d0d0 users 3
inet6 ff02::1
inet6 ff01::1
== Comment: #12 - David Z. Dai - 2017-11-13 15:07:32 ==
I found upstream already had patches that fix this problem:
1) https://www.spinics.net/lists/netdev/msg415009.html
commit 530903dd9003492edb0714e937ad4a5d1219e376
Author: Petr Vorel <[email protected]>
Date: Tue Jan 17 00:25:50 2017 +0100
ip: fix igmp parsing when iface is long
Entries with long vhost names in /proc/net/igmp have no whitespace
between name and colon, so sscanf() adds it to vhost and
'ip maddr show iface' doesn't include inet result.
Signed-off-by: Petr Vorel <[email protected]>
2) https://www.spinics.net/lists/netdev/msg461479.html
commit 21503ed2af233ffe795926f6641ac84ec1b15bf9
Author: Michal Kubecek <[email protected]>
Date: Thu Oct 19 10:21:08 2017 +0200
ip maddr: fix filtering by device
Commit 530903dd9003 ("ip: fix igmp parsing when iface is long") uses
variable len to keep trailing colon from interface name comparison. This
variable is local to loop body but we set it in one pass and use it in
following one(s) so that we are actually using (pseudo)random length for
comparison. This became apparent since commit b48a1161f5f9 ("ipmaddr: Avoid
accessing uninitialized data") always initializes len to zero so that the
name comparison is always true. As a result, "ip maddr show dev eth0" shows
IPv4 multicast addresses for all interfaces.
Instead of keeping the length, let's simply replace the trailing colon with
a null byte. The bonus is that we get correct interface name in ma.name.
Fixes: 530903dd9003 ("ip: fix igmp parsing when iface is long")
Signed-off-by: Michal Kubecek <[email protected]>
Acked-by: Phil Sutter <[email protected]>
Acked-by: Petr Vorel <[email protected]>
The fix is in the same place, but different way.
This is the current implementation In ip/ipmaddr.c file:
struct ma_info *ma;
if (buf[0] != '\t') {
size_t len;
sscanf(buf, "%d%s", &m.index, m.name);
len = strlen(m.name);
if (m.name[len - 1] == ':')
m.name[len - 1] = '\0';
continue;
}
The existing "ip" command that shows the problem:
[root@coral-sriov-host1 ip]# /usr/sbin/ip maddr show dev enP1p12s0f0 /* <--
We do NOT see the IPv4 maddr */
2: enP1p12s0f0
link 01:00:5e:00:00:01
inet6 ff02::1
inet6 ff01::1
I clone the latest "ip" utility from upstream to the same test box.
[root@coral-sriov-host1 git_iproute2]# git clone
https://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git
I build the "ip" utility on same test box, which has the above 2 patches
included.
[root@coral-sriov-host1 ip]# /root/git_iproute2/iproute2/ip/ip maddr show dev
enP1p12s0f0 /* <--- shows correct IPv4 maddr */
2: enP1p12s0f0
link 01:00:5e:00:00:01
inet 224.0.0.1 /* <--- */
inet6 ff02::1
inet6 ff01::1
** Affects: iproute2 (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-ppc64le bugnameltc-153025 severity-medium
targetmilestone-inin---
--
ip maddr show and ip maddr show dev enP20p96s0 show different data
https://bugs.launchpad.net/bugs/1732032
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