From owner-freebsd-hackers@FreeBSD.ORG  Tue Oct 18 17:01:07 2005
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To: rashmi ns <nsrashmi@gmail.com>
In-reply-to: Your message of "Tue, 18 Oct 2005 19:01:21 +0530."
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Date: Tue, 18 Oct 2005 10:01:05 -0700
From: Bakul Shah <bakul@BitBlocks.com>
Cc: freebsd-hackers@freebsd.org, freebsd-drivers@freebsd.org,
	bugi@lists.redbrick.dcu.ie
Subject: Re: help regarding : To recieve and tranmit packet th' an interface
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> we are writing a driver for HDLC-Controller We have coded upto some extent
> and actully we are able to transmit and recieve a char buff in loopback
> (from inside a driver).
>
> But we want to tranmit/Rx a real packet in (mbuf structure) and test our
> code .As it is a HDLC controller does'nt have std MAC ADDRRSS . How can i
> actually achieve a packet transmition and reception .Are there some drivers
> which does the same

Look at /sys/net/if_spppsubr.c or /sys/netgraph/ng_sppp.c.
One other option is to let your driver present a simple
serial IO interface and implement higher level logic in a
user level daemon that uses a tun device to plug into the
network layer (like /usr/sbin/ppp).  Also be, sure to read
RFC1661!