SV: [lwip-users] bind and ip_route

[Emil Ljungdahl]

Alright, thanks Kieran!

The reason for being concerned about this is that I want to make sure you
cannot mess up your current connection by "adding" the second netif in a
configuration interface with faulty parameters.

Can you see any drawbacks (except from speed and conceptual breakage) in
patching ip_route to take a src parameter as well? 
If src-param == netif's local address, use that netif, else do as I used to
do.

--
Best regards
Emil Ljungdahl

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Mansley
Skickat: den 28 mars 2011 11:09
Till: Mailing list for lwIP users
Ämne: Re: [lwip-users] bind and ip_route

On Mon, 2011-03-28 at 10:53 +0200, Emil Ljungdahl wrote:
> 
> If I bind to a port and IP-address of interface B and receives (for
> example)
> a HTTP connection request, the reply might be sent on interface A,
> since
> ip_route only selects interface depending on destination address. I'm
> not
> the guy to tell what is wrong and what is right regarding the
> IP-stack, but
> shouldn't a netconn/socket/pcb that is bound to a local address, that
> is
> "owned" by a local netif, only use that netif for both rx and tx?

No, the interface used is determined by the route table, unless you've
used the SO_BINDTODEVICE socket option (which lwIP doesn't support).

Kieran


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