Bug 1297230 - tc filter show does not display defined filters (specifically redirect filter for ingress)
tc filter show does not display defined filters (specifically redirect filter...
Product: Fedora
Classification: Fedora
Component: iproute (Show other bugs)
Unspecified Unspecified
unspecified Severity medium
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Assigned To: Phil Sutter
Fedora Extras Quality Assurance
Depends On:
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Reported: 2016-01-10 16:56 EST by an0nym
Modified: 2017-05-02 02:53 EDT (History)
3 users (show)

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Description an0nym 2016-01-10 16:56:25 EST
Description of problem:
tc filter show does not display defined filters (specifically redirect filter for ingress)

Version-Release number of selected component (if applicable):
iproute.x86_64                       4.1.1-3.fc23                       @updates

How reproducible:

Steps to Reproduce:
1. create ifb interface, add ingress qdisc to physical interface and filter all ingress traffic to the ifb interface
ip link add ifb_eth0 type ifb
ip link set ifb_eth0 up
tc qdisc add dev eth0 ingress
tc filter add dev eth0 parent ffff: protocol ip u32 match u32 0 0 action mirred egress redirect dev ifb_eth0

2. let some traffic through; notice the stats on ifb_eth0 started to increase right after adding the filter
tc -stats qdisc show dev ifb_eth0

3. show the filters 
tc filter show eth0

Actual results:
adding filter succeeds, stats increase but tc filter show displays no filters

Expected results:
tc filter show should display the filter

Additional info:
Comment 1 an0nym 2016-01-10 17:07:06 EST
It turned out tc filter show dev eth0 *root* shows the filters. 
This is quite misleading as tc filter show dev eth0 gives no errors and throughout the internet in most howtos root is not mentioned.
Comment 2 Phil Sutter 2016-01-25 11:13:17 EST

This behaviour is consistent with upstream at least. I personally specify 'parent ffff:' when listing ingress filters, which will show only filters attached to that and not also those attached to the root.

Still, the syntax for listing filters should probably get a review as things are unconsistent with listing e.g. qdiscs.

Cheers, Phil
Comment 3 Fedora End Of Life 2016-11-24 09:49:55 EST
This message is a reminder that Fedora 23 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 23. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '23'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 23 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
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Comment 4 Phil Sutter 2016-11-24 14:43:13 EST
Changing to rawhide - this is upstream work and there is no due date.
Comment 5 Fedora End Of Life 2017-02-28 04:52:42 EST
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.

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