Date: Sun, 1 Jul 2001 11:08:34 -0700 From: "Crist J. Clark" <cristjc@earthlink.net> To: Luigi Rizzo <luigi@info.iet.unipi.it> Cc: freebsd-ipfw@FreeBSD.ORG Subject: Re: BRIDGE in ip_fw.c Message-ID: <20010701110834.B296@blossom.cjclark.org> In-Reply-To: <200107011419.QAA30334@info.iet.unipi.it>; from luigi@info.iet.unipi.it on Sun, Jul 01, 2001 at 04:19:50PM %2B0200 References: <20010630232954.J348@blossom.cjclark.org> <200107011419.QAA30334@info.iet.unipi.it>
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On Sun, Jul 01, 2001 at 04:19:50PM +0200, Luigi Rizzo wrote:
> > The reason I ask is that I need the flag bits of ip->ip_off. The test
> > to see if a packet is a fragment is,
> >
> > (ip->ip_off & (IP_OFFMASK | IP_MF))
> >
> > And not just if the offset is non-zero. Obviously, whether ip->ip_off
> > is in host or network order will make a difference on how to do the
>
> same order for bridged and "regular" packets. I suppose it
> is host order from the previous snippet of code
I was assuming host order above since that is always the case now.
But according to this code,
if (0 && BRIDGED) { /* not yet... */
offset = (ntohs(ip->ip_off) & IP_OFFMASK);
ip_len = ntohs(ip->ip_len);
} else {
offset = (ip->ip_off & IP_OFFMASK);
ip_len = ip->ip_len;
}
At some point in the future, ip->ip_off might not be in host order by
the time it gets firewall code?
--
Crist J. Clark cjclark@alum.mit.edu
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