From owner-freebsd-questions  Fri Jun  4  5:57:35 1999
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From: Ladavac Marino <mladavac@metropolitan.at>
To: "'Pavel V. Antipov'" <pavel@ikar.elect.ru>,
	Riccardo Veraldi <riccardo@righi.ml.org>
Cc: freebsd-questions@FreeBSD.ORG
Subject: RE: Ethernet-level connection
Date: Fri, 4 Jun 1999 14:55:07 +0200
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> -----Original Message-----
> From:	Pavel V. Antipov [SMTP:pavel@ikar.elect.ru]
> Sent:	Friday, June 04, 1999 2:19 PM
> To:	Riccardo Veraldi
> Cc:	freebsd-questions@FreeBSD.ORG
> Subject:	Re: Ethernet-level connection
> 
> Hi !
> 
> I saw PF_PACKET parameter for system call "socket" in linux. In
> FreeBSD
> thare is PF_LINK (see <sys/sockst.h>).
> I tried to execute this program:
> 
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <iostream.h>
> #include <errno.h>
> 
> main(){
>  cout << socket(AF_LINK, SOCK_RAW, 0)<<endl;
>  cout<<errno<<endl;
> }
> 
> As a result errno == 43. I use 2.2.5 and hope that in latest versions
> of
> FreeBSD I'll find direct access to Ethernet packets via
> socket & recvfrom & sendto system calls.
> 
	[ML]  I don't think you ever will.  Use bpf instead.

	I don't think PF_PACKET will ever be in BSD because IIRC it is
only a subset of bpf functionality.  It either gets none or all packets
whereas bpf is capable of programming the NIC for packet filtering (i.e.
filtering is done in hardware, if the hardware supports it, and many
cards do, otherwise in driver).

	AFAIK PF_PACKET is a Linuxism.  Most other unices have bpf.

	/Marino
> Pavel
> 
> 
> 
> 
> 
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