New: creation of bridge interface via interfaces does not work

Buildroot bugzilla at busybox.net 1 participant 6 messages Jan 20, 2021 – Jun 15, 2024

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author

2021-01-20 14:15 UTC #0 lore raw

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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bugzilla at busybox.net

author

2021-02-17 16:26 UTC #1 lore raw

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

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

--- Comment #1 from Ryan Barnett <[email protected]> --- 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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bugzilla at busybox.net

author

2021-02-28 19:47 UTC #2 lore raw

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

In reply to bugzilla at busybox.net

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

--- Comment #2 from Frank Wunderlich <[email protected]> --- 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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author

2021-04-16 16:32 UTC #3 lore raw

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

In reply to bugzilla at busybox.net

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

--- Comment #3 from Frank Wunderlich <[email protected]> --- no more idea?

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author

2023-01-16 20:18 UTC #4 lore raw

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

In reply to bugzilla at busybox.net

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

--- Comment #4 from Arınç ÜNAL <[email protected]> --- 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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author

2024-06-15 14:56 UTC #5 lore raw

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

In reply to bugzilla at busybox.net

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

Yann E. MORIN <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED
                 CC|                            |[email protected]

--- Comment #5 from Yann E. MORIN <[email protected]> --- 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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