Re: Any good _online_ kernel BSD sockets reference out there??

From: Ivan Passos (
Date: Thu Aug 31 2000 - 11:20:43 EST

On Thu, 31 Aug 2000, Alan Cox wrote:

> > What I still don't understand is how the network layer will pass the
> > request directly to the driver _without_ goind through the INET (IP)
> > layer ... Do you know of any src code that I could use as a reference??
> > Src code that does the "request passing" would be good too ... :)
> AF_PACKET sockets allocate an sk_buff, copy the data into it and call
> dev_queue_xmit() to hand the packet as is to the driver

Ok, so please comment on the description below:

- Userspace:
        sd = socket(AF_PACKET, SOCK_RAW, 0); (Is this correct??)
        bind(how do I bind this socket to the interface, if I don't have
             an address?? Can I just make one up??);
        send(sd, data, len);

- Kernel:
        "send" makes kernel call dev_queue_xmit(), which will call the
        driver's hard_start_xmit function.

- Do I need to bring the interface up with ifconfig before being able to
  do this?? My question is because ifconfig doesn't have a "raw mode"
  address family ...
- Who opens the interface, if not ifconfig??

Sorry for my dumb questions, and thanks for your help!!


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