Re: kern/86848: [pf][multicast] destroying active syncdev leads to panic


Hi,


Please try the attached patch which should hopefully fix this issue (untested).

Regards,
BMS

? .swp
Index: if_pfsync.c
===================================================================
RCS file: /home/ncvs/src/sys/contrib/pf/net/if_pfsync.c,v
retrieving revision 1.32
diff -u -p -r1.32 if_pfsync.c
--- if_pfsync.c 29 Dec 2006 13:59:47 -0000 1.32
+++ if_pfsync.c 25 Feb 2007 16:11:03 -0000
@@ -170,6 +170,9 @@ void pfsync_timeout(void *);
void pfsync_send_bus(struct pfsync_softc *, u_int8_t);
void pfsync_bulk_update(void *);
void pfsync_bulkfail(void *);
+#ifdef __FreeBSD__
+static void pfsync_ifdetach(void *, struct ifnet *);
+#endif

int pfsync_sync_ok;
#ifndef __FreeBSD__
@@ -191,6 +194,9 @@ pfsync_clone_destroy(struct ifnet *ifp)
struct pfsync_softc *sc;

sc = ifp->if_softc;
+#ifdef __FreeBSD__
+ EVENTHANDLER_DEREGISTER(ifnet_departure_event, sc->sc_detachtag);
+#endif
callout_stop(&sc->sc_tmo);
callout_stop(&sc->sc_bulk_tmo);
callout_stop(&sc->sc_bulkfail_tmo);
@@ -225,6 +231,16 @@ pfsync_clone_create(struct if_clone *ifc
return (ENOSPC);
}

+#ifdef __FreeBSD__
+ sc->sc_detachtag = EVENTHANDLER_REGISTER(ifnet_departure_event,
+ pfsync_ifdetach, sc, EVENTHANDLER_PRI_ANY);
+ if (sc->sc_detachtag == NULL) {
+ if_free(ifp);
+ free(sc, M_PFSYNC);
+ return (ENOSPC);
+ }
+#endif
+
pfsync_sync_ok = 1;
sc->sc_mbuf = NULL;
sc->sc_mbuf_net = NULL;
@@ -1870,6 +1886,35 @@ pfsync_sendout(sc)

#ifdef __FreeBSD__
static void
+pfsync_ifdetach(void *arg, struct ifnet *ifp)
+{
+ struct pfsync_softc *sc = (struct pfsync_softc *)arg;
+ struct ip_moptions *imo;
+
+ if (sc == NULL || sc->sc_sync_ifp != ifp)
+ return; /* not for us; unlocked read */
+
+ PF_LOCK();
+
+ /* Deal with detaching an interface which went away. */
+ sc->sc_sync_ifp = NULL;
+ if (sc->sc_mbuf_net != NULL) {
+ s = splnet();
+ m_freem(sc->sc_mbuf_net);
+ sc->sc_mbuf_net = NULL;
+ sc->sc_statep_net.s = NULL;
+ splx(s);
+ }
+ imo = &sc->sc_imo;
+ if (imo->imo_num_memberships > 0) {
+ in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
+ imo->imo_multicast_ifp = NULL;
+ }
+
+ PF_UNLOCK();
+}
+
+static void
pfsync_senddef(void *arg)
{
struct pfsync_softc *sc = (struct pfsync_softc *)arg;
@@ -1879,6 +1924,14 @@ pfsync_senddef(void *arg)
IF_DEQUEUE(&sc->sc_ifq, m);
if (m == NULL)
break;
+#if 1
+ /* XXX: paranoia */
+ if (sc->sc_sync_ifp == NULL) {
+ pfsyncstats.pfsyncs_oerrors++;
+ m_freem(m);
+ continue;
+ }
+#endif
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
pfsyncstats.pfsyncs_oerrors++;
}
Index: if_pfsync.h
===================================================================
RCS file: /home/ncvs/src/sys/contrib/pf/net/if_pfsync.h,v
retrieving revision 1.7
diff -u -p -r1.7 if_pfsync.h
--- if_pfsync.h 10 Jun 2005 17:23:49 -0000 1.7
+++ if_pfsync.h 25 Feb 2007 16:11:03 -0000
@@ -181,6 +181,7 @@ struct pfsync_softc {
int sc_maxupdates; /* number of updates/state */
#ifdef __FreeBSD__
LIST_ENTRY(pfsync_softc) sc_next;
+ eventhandler_tag sc_detachtag;
#endif
};
#endif
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