Bug 201071 - Creating a vxlan in state 'up' does not give proper RTM_NEWLINK message
Summary: Creating a vxlan in state 'up' does not give proper RTM_NEWLINK message
Status: NEW
Alias: None
Product: Networking
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Stephen Hemminger
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-09-10 04:04 UTC by liam.mcbirnie
Modified: 2018-09-12 07:57 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.19-rc1
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
patch to fix notification on newlink with IFF_UP (905 bytes, patch)
2018-09-12 04:44 UTC, Roopa Prabhu 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description liam.mcbirnie 2018-09-10 04:04:37 UTC 
If a vxlan is created with state 'up', the RTM_NEWLINK message shows the state as down, and there no other netlink messages are sent.
As a result, processes listening to netlink are never notified that the vxlan link is up.

eg.
# ip link add test up type vxlan id 8 group 224.224.224.224 dev eth0

Output of ip monitor link
# 4: test: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default
      link/ether ee:cd:97:1a:cf:91 brd ff:ff:ff:ff:ff:ff

Output of ip link show (expected from netlink message)
# 4: test: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default qlen 1000
      link/ether ee:cd:97:1a:cf:91 brd ff:ff:ff:ff:ff:ff

This is a regression introduced by the following patch series.
https://patchwork.ozlabs.org/patch/947181/
Comment 1 Roopa Prabhu 2018-09-12 04:44:38 UTC 
Created attachment 278465 [details]
patch to fix notification on newlink with IFF_UP

Can you please try the attached patch ?. thank you.
Comment 2 liam.mcbirnie 2018-09-12 07:57:39 UTC 
Your patch works.
Thanks.
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