On Fri, 26 Feb 2010 20:39:59 +0300
Pavel Emelyanov [off-list ref] wrote:

Cyrill Gorcunov wrote:

quoted

On Fri, Feb 26, 2010 at 08:18:43AM -0800, Stephen Hemminger wrote:

quoted

Looking back at this. What if the API was simpler:

Thanks for the reply, Stephen!

quoted

quoted

Why not:
  1. Setup bridge (and any other interfaces except eth0); includes bringing br0 up
  2. Add eth0 to bridge with new flag to inherit
       a. brctl addif br0 eth0 inherit

Inherit functionality would need to move address (Ether, IP, IPv6)
and routes from eth0 to br0.
I will see about doing it as much as possible in userspace.

Solution is good, but we'll have to reconfigure netfilter matches
that check for device name/ifindex and restore all this back when
deleting eth0 from br0.

Netfilter is outside of this, and can't really migrate easily.

Maybe it's better to implement it on the kernel side by sending a 
netdev notification and letting the subsystem reconfigure themselves?

And what can we do with existing TCP connections bound to a device?

TCP connections are never really bound to device. TCP routing is
flexible; if packets can get through, it doesn't care.

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