Re: j1939: bind() and connect()

[David Jander <david@protonic.nl>]

On Tue, 15 Aug 2017 10:14:18 +0200
Marc Kleine-Budde <mkl@pengutronix.de> wrote:

> On 08/14/2017 07:37 PM, Marc Kleine-Budde wrote:
> > - Should a second bind() be allowed on a previously bind() socket?
> > 
> > As far as I understand the code, there's some support, but when the
> > interface is switched, j1939_ifindex_stop() is not called.  
> 
> Ah, there's a check, that you cannot re-bind() to another interface:
> 
> > 		if (bound_dev_if != addr->can_ifindex)  

This makes sense. re-bind() to another interface only would make sense if
bind() to any interface is also permitted, but that would imply separate
address-claims on all different interfaces with potentially different
source-address being claimed on each one.... don't think the stack should take
care of such complex scenarios, at least not at first IMHO.

Best regards,

-- 
David Jander
Protonic Holland.