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

From: Alan Cox (
Date: Thu Aug 31 2000 - 11:28:09 EST

> - Userspace:
> sd = socket(AF_PACKET, SOCK_RAW, 0); (Is this correct??)

It can be for pure raw data

> bind(how do I bind this socket to the interface, if I don't have
> an address?? Can I just make one up??);


        (see linux/if_packet.h>

> send(sd, data, len);


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


> Questions:
> - 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 ...

It needs to be up, but it doesnt need to be assigned IP addresses in current
kernels (2.0 does need IP)

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