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Date: Thu, 10 Jun 2004 18:22:37 +0400
From: Roman Kurakin <rik@cronyx.ru>
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To: Guy Harris <guy@alum.mit.edu>
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cc: net@FreeBSD.org
Subject: Re: cvs commit: src/sys/net bpf.h
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Yea, I think the same.

rik
Guy Harris wrote:

>> This commit reminded me one of my old ideas. Why not to make some
>> function that allow to change DLT on the fly?
>
>
> Such as NetBSD's "bpf_change_type()"?
>
> /*
>  * Change the data link type of a interface.
>  */
> void
> bpf_change_type(ifp, dlt, hdrlen)
>         struct ifnet *ifp;
>         u_int dlt, hdrlen;
> {
>         struct bpf_if *bp;
>
>         for (bp = bpf_iflist; bp != NULL; bp = bp->bif_next) {
>                 if (bp->bif_driverp == (struct bpf_if **)&ifp->if_bpf)
>                         break;
>         }
>         if (bp == NULL)
>                 panic("bpf_change_type");
>
>         bp->bif_dlt = dlt;
>
>         /*
>          * Compute the length of the bpf header.  This is not necessarily
>          * equal to SIZEOF_BPF_HDR because we want to insert spacing such
>          * that the network layer header begins on a longword boundary 
> (for
>          * performance reasons and to alleviate alignment restrictions).
>          */
>         bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
> }
>
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