[Bug] Unable to select interface on bridge adapter

[alteredtech]

Creating this issue from this post here.

Issue that OP was having:
failed to open interface '[network adapter]' for capture; [network adapter]; You don't have permission to capture on that device (socket: Operation not permitted)

Issue that I am having:
failed to open interface 'any' for capture: any: socket: Address family not supported by protocol
Happens with wlan, enp, and pseudo-device interface I select for bridge.

Using
xemu - v0.7.86
flatpak - 1.12.4
Steamdeck OS - 3.4.6

[j8r]

Does sudo setcap cap_net_raw,cap_net_admin=eip /var/lib/flatpak/app/app.xemu.xemu/current/active/files/bin/xemu fix it?

[alteredtech]

Unfortunately it did not.
Just some more info, I installed xemu with emudeck.

[mborgerson]

This is apparently a limitation of Flatpak sandboxing. Like Wireshark, xemu cannot get raw access to monitor/inject packets on the bridge interface via libpcap.

[HamzaDevz]

So what's the solution ?

[mborgerson]

@HamzaDevz The solution is to use a non-flatpak version of xemu if you need bridge mode, eg AppImage, PPA, or building from source.

[BillCosby42]

I was able to run the AppImage version of Xemu on the steamdeck and am now getting a permission error when enabling the bridge adapter. I tired sudo setcap cap_net_raw,cap_net_admin=eip `file name' on the file but it doesn't seem to change the permission error. Is there another permission or way of setting the permission that I can use?

[Xeddius]

@HamzaDevz The solution is to use a non-flatpak version of xemu if you need bridge mode, eg AppImage, PPA, or building from source.

Appimage has the same problems, PPA isn't an option on SteamOS, Building from source is not ideal.
We need a more robust solution to this issue, especially given how important networking was on this console and how nice it would be to have it working on Linux handhelds.