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Date: Thu, 20 May 2004 16:16:29 +0300
From: Ruslan Ermilov <ru@freebsd.org>
To: Eugene Grosbein <eugen@grosbein.pp.ru>
Message-ID: <20040520131629.GL1664@ip.net.ua>
References: <40A9CF72.85E2EC9D@kuzbass.ru> <20040518105134.GC70919@ip.net.ua>
	<20040520130052.GA442@grosbein.pp.ru>
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cc: net@freebsd.org
Subject: Re: [ANALISYS] Re: multicast arp entry
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On Thu, May 20, 2004 at 09:00:52PM +0800, Eugene Grosbein wrote:
[...]
> 3. Now we enter ip_output() keeping imo as one of arguments.
>    There we run the following code:
>=20
> 	else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
>             imo !=3D NULL && imo->imo_multicast_ifp !=3D NULL) {
>                 /*
>                  * Bypass the normal routing lookup for multicast
>                  * packets if the interface is specified.
>                  */
>                 ifp =3D imo->imo_multicast_ifp;
>                 IFP_TO_IA(ifp, ia);
>                 isbroadcast =3D 0;        /* fool gcc */
>         }
>=20
>     It's allright still.
>=20
> 4. When ipfw diverts our packet, we call
>=20
>      /* Deliver packet to divert input routine */
>      divert_packet(m, 0, off & 0xffff, args.divert_rule);
>=20
>    Ops, imo is not passed by! So our imo->imo_multicast_ifp is lost
>    and diverted packet will not be sent through it but routing lookup
>    will be performed.
>=20
> Should I fill the PR?
>=20
You're rather supposed to submit a working patch.  ;)


Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer

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