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If this is the patch Dave talked about, my answer is no. I don't use it =
on
my soekris boxes...

> -----Message d'origine-----
> De=A0: tech-net-owner@NetBSD.org [mailto:tech-net-owner@NetBSD.org] De =
la
> part de Manuel Bouyer
> Envoy=E9=A0: mardi 4 avril 2006 21:29
> =C0=A0: tech-net@NetBSD.org
> Objet=A0: Re: patch: handle shared/read-only ipv6+icmp6 mbuf storage
>=20
> On Thu, Mar 30, 2006 at 02:37:03PM -0600, David Young wrote:
> > [...]
> > Index: ip6_input.c
> > =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > RCS file: /cvsroot/src/sys/netinet6/ip6_input.c,v
> > retrieving revision 1.83
> > diff -u -p -u -p -r1.83 ip6_input.c
> > --- ip6_input.c	5 Mar 2006 23:47:08 -0000	1.83
> > +++ ip6_input.c	30 Mar 2006 19:27:16 -0000
> > @@ -234,7 +234,7 @@ void
> >  ip6_input(m)
> >  	struct mbuf *m;
> >  {
> > -	struct ip6_hdr *ip6;
> > +	struct ip6_hdr *ip6, *tmp;
> >  	int off =3D sizeof(struct ip6_hdr), nest;
> >  	u_int32_t plen;
> >  	u_int32_t rtalert =3D ~0;
> > @@ -305,7 +305,27 @@ ip6_input(m)
> >  		}
> >  	}
> >
> > -	ip6 =3D mtod(m, struct ip6_hdr *);
> > +        /* If we will embed a scope identifier in either the source =
or
> > +         * destination address or both, then make them both =
writable.
> > +	 * We have to do this to avoid scribbling over read-only/shared
> > +	 * mbuf storage.
> > +	 *
> > +         * XXX It may be possible to do this nearer to the place
> > +         * XXX where the src & dst are rewritten, per Manuel =
Bouyer's
> > +         * XXX suggestion on tech-net.
> > +	 */
> > +	tmp =3D mtod(m, struct ip6_hdr *);
> > +	if (!(IN6_IS_SCOPE_EMBEDDABLE(&tmp->ip6_src) ||
> > +	      IN6_IS_SCOPE_EMBEDDABLE(&tmp->ip6_dst)))
> > +		ip6 =3D tmp;
> > +	else if (m_makewritable(&m, 0, sizeof(struct ip6_hdr),
> > +	    M_DONTWAIT) !=3D 0) {
> > +		struct ifnet *inifp =3D m->m_pkthdr.rcvif;
> > +		ip6stat.ip6s_toosmall++;	/* XXXDCY new stat */
> > +		in6_ifstat_inc(inifp, ifs6_in_hdrerr);	/* XXXDCY new stat
> */
> > +		goto bad;
>=20
> As I already said, I think you should move this check later in the =
code,
> when we're actually going to the mbuf (i.e. just before the call to
> in6_setscope). The packet may actually be dropped before reaching
> in6_setscope() and copying it in this case would be a waste of =
ressources.
>=20
> --
> Manuel Bouyer <bouyer@antioche.eu.org>
>      NetBSD: 26 ans d'experience feront toujours la difference
> --


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