From owner-freebsd-questions  Thu Aug  8  4:10:35 2002
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Date: Wed, 7 Aug 2002 18:02:05 -0400 (EDT)
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Subject: RE: Your Mail [ BPF ]
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Subject: Re: your mail [ BPF ]

On Wed, 7 Aug 2002, Heewon Lee wrote:

> Date: Wed, 7 Aug 2002 16:32:35 -0400
> From: Heewon Lee <lee_h@pannaway.com>
> To: freebsd-questions@FreeBSD.ORG
> 
> Hi,
> 
>  
> 
> Is any type of Packet Filter implemented in FreeBSD? Perhaps BPF?
> 
> If so, which version?
> 
>  
> 
> Thanks,
> 
> -Heewon
> 

man bpf | col -b | grep -A 18 BIOCVERSION


     BIOCVERSION    (struct bpf_version) Returns the major and minor version
                    numbers of the filter language currently recognized by the
                    kernel.  Before installing a filter, applications must
                    check that the current version is compatible with the run-
                    ning kernel.  Version numbers are compatible if the major
                    numbers match and the application minor is less than or
                    equal to the kernel minor.  The kernel version number is
                    returned in the following structure:

                    struct bpf_version {
                            u_short bv_major;
                            u_short bv_minor;
                    };

                    The current version numbers are given by BPF_MAJOR_VERSION
                    and BPF_MINOR_VERSION from <net/bpf.h>. An incompatible
                    filter may result in undefined behavior (most likely, an
                    error returned by ioctl() or haphazard packet matching).

			HTH


	/* 
	 *	Guy F. Boyd	
	 *	VTA Technologies 
	 *  	Atlanta, Georgia U.S.A
	 * 	www.vta.com
	*/


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