Date: Wed, 5 Aug 1998 00:43:55 +0200 (CEST) From: Stefan Bethke <stb@hanse.de> To: Julian Elischer <julian@whistle.com> Cc: Parag Patel <parag@cgt.com>, current@FreeBSD.ORG Subject: Re: Netatalk name-registering problem with -current Message-ID: <Pine.BSF.3.96.980805003231.1544A-100000@transit.hanse.de> In-Reply-To: <Pine.BSF.3.96.980803224405.10187B-100000@transit.hanse.de>
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On Tue, 4 Aug 1998, Stefan Bethke wrote:
> On Sat, 1 Aug 1998, Julian Elischer wrote:
>
> > yes there is a problem with -current and netatalk name registration.
> >
> > it's on my list of things to look at..
> > there are two suspicious areas..
>
> I've delved a bit into this and think I've found the problem.
>
> In net/ether_output, around line 365, if_simloop() is called with a fixed
> LLC header length of ETHER_HDR_LEN, instead of whatever length the header
> has (in case of a SNAP frame [Phase 2], its a LLC header).
There's a second problem: because packets for our own address are handed to
ether_output, an aarpresolve() is tried. As it seems to me, our own MAC
address isn't in the table, so a request goes out and is received by
aarp_input(). aarp_input() however doesn't respond to requests coming from
the address of the interface it was received from; so the packet is never
delivered.
The quick workaround is to call if_simloop() from ddp_output.
The right thing to do would be to integrate AARP into the routing tables
(as for ARP). If I could only figure out how this whole stuff works...
Enought muttering: please test the following patch. At least you can
successfully register, deregister, and query NBPs again; because my oldish
IIcx went up in smoke the last night I have nothing to really test it
against.
--------- snip ----------
Index: src/sys/net/if_ethersubr.c
===================================================================
RCS file: /home/ncvs/src/sys/net/if_ethersubr.c,v
retrieving revision 1.51
diff -u -r1.51 if_ethersubr.c
--- if_ethersubr.c 1998/06/14 20:58:14 1.51
+++ if_ethersubr.c 1998/08/04 20:13:12
@@ -132,6 +132,7 @@
register struct rtentry *rt;
register struct ether_header *eh;
int off, len = m->m_pkthdr.len, loop_copy = 0;
+ int hlen; /* link layer header lenght */
struct arpcom *ac = (struct arpcom *)ifp;
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
@@ -161,6 +162,7 @@
time_second < rt->rt_rmx.rmx_expire)
senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
}
+ hlen = ETHER_HDR_LEN;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
@@ -203,6 +205,7 @@
llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
type = htons(m->m_pkthdr.len);
+ hlen = sizeof(struct llc) + ETHER_HDR_LEN;
} else {
type = htons(ETHERTYPE_AT);
}
@@ -362,10 +365,10 @@
if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
- (void) if_simloop(ifp, n, dst, ETHER_HDR_LEN);
+ (void) if_simloop(ifp, n, dst, hlen);
} else if (bcmp(eh->ether_dhost,
eh->ether_shost, ETHER_ADDR_LEN) == 0) {
- (void) if_simloop(ifp, m, dst, ETHER_HDR_LEN);
+ (void) if_simloop(ifp, m, dst, hlen);
return(0); /* XXX */
}
}
Index: src/sys/netatalk/ddp_output.c
===================================================================
RCS file: /home/ncvs/src/sys/netatalk/ddp_output.c,v
retrieving revision 1.12
diff -u -r1.12 ddp_output.c
--- ddp_output.c 1998/07/13 06:34:02 1.12
+++ ddp_output.c 1998/08/04 22:29:06
@@ -72,6 +72,11 @@
}
deh->deh_bytes = htonl( deh->deh_bytes );
+#ifdef NETATALK_DEBUG
+ printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
+ ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
+ ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
+#endif
return( ddp_route( m, &ddp->ddp_route ));
}
@@ -142,13 +147,24 @@
}
} else {
m_freem( m );
- return( EINVAL );
+#ifdef NETATALK_DEBUG
+ if (ro->ro_rt == NULL)
+ printf ("ddp_route: no ro_rt.\n");
+ else if (ro->ro_rt->rt_ifa == NULL)
+ printf ("ddp_route: no ro_rt->rt_ifa\n");
+ else
+ printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
+#endif
+ return( ENETUNREACH );
}
if ( aa == NULL ) {
-printf( "ddp_route: oops\n" );
+#ifdef NETATALK_DEBUG
+ printf( "ddp_route: no atalk address found for %s%d\n",
+ ifp->if_name, ifp->if_unit);
+#endif
m_freem( m );
- return( EINVAL );
+ return( ENETUNREACH );
}
/*
@@ -189,7 +205,24 @@
}
ro->ro_rt->rt_use++;
+#ifdef NETATALK_DEBUG
+ printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s%d)\n",
+ ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
+ satosat(&aa->aa_addr)->sat_addr.s_node,
+ ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
+ satosat(&ro->ro_dst)->sat_addr.s_node,
+ ntohs(gate.sat_addr.s_net),
+ gate.sat_addr.s_node,
+ ifp->if_name, ifp->if_unit);
+#endif
+
+ /* short-circuit the output if we're sending this to ourself */
+ if ((satosat(&aa->aa_addr)->sat_addr.s_net == satosat(&ro->ro_dst)->sat_addr.s_net) &&
+ (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
+ {
+ return (if_simloop(ifp, m, (struct sockaddr *)&gate, 0));
+ }
+
return((*ifp->if_output)( ifp,
m, (struct sockaddr *)&gate, NULL)); /* XXX */
}
-
---------- snip -----------
Cheers,
Stefan
--
Stefan Bethke
Muehlendamm 12 Phone: +49-40-256848, +49-177-3504009
D-22087 Hamburg <stefan.bethke@hanse.de>
Hamburg, Germany <stb@freebsd.org>
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