Re: pcap_inject() on loopback (FreeBSD)

[Guy Harris <guy () alum mit edu>]

On Jun 16, 2014, at 2:50 AM, Guy Harris <guy () alum mit edu> wrote:

> On Jun 15, 2014, at 1:56 PM, Fernando Gont <fernando () gont com ar> wrote:
>
> > I will certainly file a bug report, and CC you. My understanding is that
> > this should be filled in most (if not all) of the BSD variants? (because
> > besides the error message one obtains, it seems that in several flavors
> > of them, pcap_inject() fails for the same reason).
>
> NetBSD, OpenBSD, and Dragonfly BSD appear not to even have the ...

...and OpenBSD may need to do

        /* BPF writes need to be handled specially. */
        if (dst->sa_family == pseudo_AF_HDRCMPLT) {
                bcopy(dst->sa_data, &af, sizeof(af));
                af = ntohl(af);
        } else
                af = dst->sa_family;

as its loopback device has a DLT_ of DLT_LOOP rather than DLT_NULL and, with DLT_LOOP, the 4-byte AF_ header of the 
packet is in *network* byte order rather than *host* byte order.
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