It's required for read only in some situations too, for example we use
it here to listen for process exit codes.
http://man7.org/linux/man-pages/man7/netlink.7.html
Mentions two separate cases:
1. "Only processes with an effective UID of 0 or the CAP_NET_ADMIN
capability may send or listen to a netlink multicast group."
2. "NLM_F_ATOMIC requires the CAP_NET_ADMIN capability or an effective
UID of 0."
On 22/02/2017 18:24, Matt Layher wrote:
Sure, I can make a note of this. Almost everything I've done with
netlink so far has been read-only, which is probably why I haven't run
into any issues.
On Wednesday, February 22, 2017 at 1:13:26 PM UTC-5, Steven Hartland
wrote:
One thing you don't mention, which we found particularly
frustrating with netlink, is that using it can often need
cap_net_admin :(
On 22/02/2017 17:38, Matt Layher wrote:
Hey all,
I recently spent some time working with Linux's netlink IPC
mechanism in Go. Because I had a hard time finding accurate
information about netlink, I decided to do a write-up on some of
its fundamental concepts, and how I was able to make use of them
from Go.
This post focuses on how netlink sockets and messages work, and
how to work with them from Go or another language of your choice.
You can find the first portion of that write-up, focusing on
netlink, here:
https://medium.com/@mdlayher/linux-netlink-and-go-part-1-netlink-4781aaeeaca8
<https://medium.com/@mdlayher/linux-netlink-and-go-part-1-netlink-4781aaeeaca8>
I still have more to write regarding generic netlink and my
high-level Go netlink and wifi packages themselves (parts 2 and 3).
If you're just looking for some source code, check out:
https://github.com/mdlayher/netlink
<https://github.com/mdlayher/netlink>
https://github.com/mdlayher/wifi <https://github.com/mdlayher/wifi>
Happy to address any questions or comments here. Thanks for your
time!
- Matt Layher
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