[Buildroot] [Bug 13466] New: creation of bridge interface via interfaces does not work

[Buildroot] [Bug 13466] New: creation of bridge interface via interfaces does not work

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13466

            Bug ID: 13466
           Summary: creation of bridge interface via interfaces does not
                    work
           Product: buildroot
           Version: 2020.11.1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: frank-w at public-files.de
                CC: buildroot at uclibc.org
  Target Milestone: ---

Hi,

i try to add bridge-interface via interfaces file (overlay_rootfs), but i got
only an error on bootup.

Cannot find device "br0"

bridge-related part of interfaces-file (config of lan0 also there and this
works)

auto lan1
iface lan1 inet manual
auto lan2
iface lan2 inet manual

auto br0
iface br0 inet static
    address 192.168.40.1
    netmask 255.255.255.0
    bridge_ports lan1 lan2
    bridge_fd 5
    bridge_stp no

also posted a question at stack-overflow because this is maybe no bug as it
looks like for me
https://unix.stackexchange.com/questions/629714/buildroot-adding-bridge-via-interfaces

of course i have added bridge-utils package and can add the bridge manually,
but not via /etc/network/interfaces file

regards Frank

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[Buildroot] [Bug 13466] creation of bridge interface via interfaces does not work

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13466

--- Comment #1 from Ryan Barnett <ryan.barnett@rockwellcollins.com> ---
Hello,

The supports for bridges in the /etc/network/interfaces file is provide by
Debian through the combination of having two packages installed: bridge-utils
and ifupdown. Debian has customized bridge-utils package to provide support for
bridge syntax in the /etc/network/interfaces file with the ifupdown package.

On Debian based distributions, the syntax for bridge in /etc/network/interfaces
is accomplished utilizing if-pre-up.d/bridge and if-post-down.d/bridge hooks as
seen from the list of the Debian package files [1].

Buildroot utilizes the official bridge-utils source from kernel.org which does
not contain any of these ifupdown hooks [2]. 

In order to support this syntax utilizing buildroot, I'd recommend that the
full version of ifupdown be built. Support for the bridge hooks could be added
by utilizing a BR2_ROOTFS_OVERLAY [3] which installs the hooks for bridge
support in the /etc/network/if-pre-up.d/ and fi-post-down.d/ hook locations
utilizing the Debian source [4]

Thanks,
-Ryan

[1] - https://packages.debian.org/stretch/amd64/bridge-utils/filelist
[2] -
https://git.busybox.net/buildroot/tree/package/bridge-utils/bridge-utils.mk#n9
[3] - https://buildroot.org/downloads/manual/manual.html#rootfs-custom
[4] - https://sources.debian.org/src/bridge-utils/1.6-2/debian/ifupdown.sh/

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[Buildroot] [Bug 13466] creation of bridge interface via interfaces does not work

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13466

--- Comment #2 from Frank Wunderlich <frank-w@public-files.de> ---
hi, i've added bridge-utils.sh and ifupdown.sh to /lib/bridge-utils (like it's
done in rules of package) including sylinks in /etc/network/if-pre-up.d and
if-post-down.d

# ls -l /lib/bridge-utils/                                                      
total 16                                                                        
-rwxr-xr-x    1 root     root          1621 Feb 18 14:57 bridge-utils.sh        
-rwxr-xr-x    1 root     root          5307 Feb 18 14:57 ifupdown.sh

# ls -l /etc/network/if-post-down.d/bridge                                      
lrwxrwxrwx    1 root     root            29 Feb 28 17:51
/etc/network/if-post-down.d/bridge -> /lib/bridge-utils/ifupdown.sh             
# ls -l /etc/network/if-pre-up.d/bridge                                         
lrwxrwxrwx    1 root     root            29 Feb 28 17:51
/etc/network/if-pre-up.d/bridge -> /lib/bridge-utils/ifupdown.sh                
# 

and added BR2_PACKAGE_IFUPDOWN to my config...

but it seems not working, i guess the hooks are not picked up by anything

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[Buildroot] [Bug 13466] creation of bridge interface via interfaces does not work

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13466

--- Comment #3 from Frank Wunderlich <frank-w@public-files.de> ---
no more idea?

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[Buildroot] [Bug 13466] creation of bridge interface via interfaces does not work

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=13466

--- Comment #4 from Arınç ÜNAL <arinc.unal@arinc9.com> ---
I made it work. The brctl check on ifupdown.sh needed to be changed to
/usr/sbin/brctl.

I only needed to install bridge-utils. No need for the ifupdown package. Bridge
VLAN filtering won't work if iproute2 is not installed. BusyBox's ip command
does not support that.

My current rootfs overlay looks like this:

rootfsOverlay
├── etc
│   └── network
│       ├── if-down.d
│       │   └── bridge -> /lib/bridge-utils/ifupdown.sh
│       ├── if-post-down.d
│       │   └── bridge -> /lib/bridge-utils/ifupdown.sh
│       ├── if-pre-up.d
│       │   └── bridge -> /lib/bridge-utils/ifupdown.sh
│       └── interfaces
└── lib
    └── bridge-utils
        ├── bridge-utils.sh
        └── ifupdown.sh

I'm planning to work on the scripts a little to replace brctl with ip so it
would be usable without requiring any other packages to be installed.

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[Buildroot] [Bug 13466] creation of bridge interface via interfaces does not work

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=13466

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED
                 CC|                            |yann.morin.1998@free.fr

--- Comment #5 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Thank you for your report.

The issue tracker for the Buildroot project has been moved to
the Gitlab.com issue tracker:
    https://gitlab.com/buildroot.org/buildroot/-/issues

We are taking this opportunity to close old issues in this old
tracker. If you believe your issue is still relevant, please
open one in the new issue tracker.

Thank you!

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