Fix for if_start() and pfil_hook() being called from hardware interrupt
context (reported on various mailing-lists, and part of PR kern/41114, causing panic in pf(4) and possibly ipf(4) when BRIDGE_IPF is used). Defer bridge_forward() to a software interrupt; bridge_input() enqueues mbufs to ifp->if_snd which is handled in bridge_forward().
This commit is contained in:
bouyer
parent
481ff5ace4
commit
1fd1b49685
@ -1,4 +1,4 @@
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/* $NetBSD: if_bridge.c,v 1.64 2009/01/18 10:28:55 mrg Exp $ */
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/* $NetBSD: if_bridge.c,v 1.65 2009/04/04 10:00:23 bouyer Exp $ */
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/*
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* Copyright 2001 Wasabi Systems, Inc.
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@ -80,7 +80,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.64 2009/01/18 10:28:55 mrg Exp $");
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__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.65 2009/04/04 10:00:23 bouyer Exp $");
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#include "opt_bridge_ipf.h"
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#include "opt_inet.h"
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@ -97,6 +97,7 @@ __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.64 2009/01/18 10:28:55 mrg Exp $");
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#include <sys/proc.h>
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#include <sys/pool.h>
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#include <sys/kauth.h>
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#include <sys/cpu.h>
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#if NBPFILTER > 0
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#include <net/bpf.h>
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@ -185,7 +186,7 @@ static int bridge_init(struct ifnet *);
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static void bridge_stop(struct ifnet *, int);
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static void bridge_start(struct ifnet *);
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static void bridge_forward(struct bridge_softc *, struct mbuf *m);
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static void bridge_forward(void *);
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static void bridge_timer(void *);
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@ -350,6 +351,13 @@ bridge_clone_create(struct if_clone *ifc, int unit)
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sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
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sc->sc_filter_flags = 0;
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/* software interrupt to do the work */
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sc->sc_softintr = softint_establish(SOFTINT_NET, bridge_forward, sc);
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if (sc->sc_softintr == NULL) {
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free(sc, M_DEVBUF);
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return ENOMEM;
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}
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/* Initialize our routing table. */
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bridge_rtable_init(sc);
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@ -370,6 +378,7 @@ bridge_clone_create(struct if_clone *ifc, int unit)
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ifp->if_addrlen = 0;
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ifp->if_dlt = DLT_EN10MB;
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ifp->if_hdrlen = ETHER_HDR_LEN;
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IFQ_SET_READY(&ifp->if_snd);
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if_attach(ifp);
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@ -410,6 +419,10 @@ bridge_clone_destroy(struct ifnet *ifp)
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/* Tear down the routing table. */
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bridge_rtable_fini(sc);
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softint_disestablish(sc->sc_softintr);
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free(sc, M_DEVBUF);
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return (0);
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@ -1305,124 +1318,139 @@ bridge_start(struct ifnet *ifp)
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* The forwarding function of the bridge.
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*/
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static void
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bridge_forward(struct bridge_softc *sc, struct mbuf *m)
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bridge_forward(void *v)
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{
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struct bridge_softc *sc = v;
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struct mbuf *m;
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struct bridge_iflist *bif;
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struct ifnet *src_if, *dst_if;
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struct ether_header *eh;
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int s;
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src_if = m->m_pkthdr.rcvif;
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sc->sc_if.if_ipackets++;
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sc->sc_if.if_ibytes += m->m_pkthdr.len;
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/*
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* Look up the bridge_iflist.
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*/
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bif = bridge_lookup_member_if(sc, src_if);
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if (bif == NULL) {
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/* Interface is not a bridge member (anymore?) */
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m_freem(m);
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if ((sc->sc_if.if_flags & IFF_RUNNING) == 0)
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return;
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}
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if (bif->bif_flags & IFBIF_STP) {
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switch (bif->bif_state) {
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case BSTP_IFSTATE_BLOCKING:
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case BSTP_IFSTATE_LISTENING:
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case BSTP_IFSTATE_DISABLED:
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s = splbio();
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while (1) {
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IFQ_POLL(&sc->sc_if.if_snd, m);
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if (m == NULL)
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break;
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IFQ_DEQUEUE(&sc->sc_if.if_snd, m);
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src_if = m->m_pkthdr.rcvif;
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sc->sc_if.if_ipackets++;
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sc->sc_if.if_ibytes += m->m_pkthdr.len;
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/*
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* Look up the bridge_iflist.
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*/
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bif = bridge_lookup_member_if(sc, src_if);
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if (bif == NULL) {
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/* Interface is not a bridge member (anymore?) */
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m_freem(m);
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return;
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continue;
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}
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}
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eh = mtod(m, struct ether_header *);
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if (bif->bif_flags & IFBIF_STP) {
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switch (bif->bif_state) {
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case BSTP_IFSTATE_BLOCKING:
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case BSTP_IFSTATE_LISTENING:
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case BSTP_IFSTATE_DISABLED:
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m_freem(m);
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continue;
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}
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}
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/*
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* If the interface is learning, and the source
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* address is valid and not multicast, record
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* the address.
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*/
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if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
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ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
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(eh->ether_shost[0] == 0 &&
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eh->ether_shost[1] == 0 &&
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eh->ether_shost[2] == 0 &&
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eh->ether_shost[3] == 0 &&
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eh->ether_shost[4] == 0 &&
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eh->ether_shost[5] == 0) == 0) {
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(void) bridge_rtupdate(sc, eh->ether_shost,
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src_if, 0, IFBAF_DYNAMIC);
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}
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eh = mtod(m, struct ether_header *);
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if ((bif->bif_flags & IFBIF_STP) != 0 &&
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bif->bif_state == BSTP_IFSTATE_LEARNING) {
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m_freem(m);
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return;
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}
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/*
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* If the interface is learning, and the source
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* address is valid and not multicast, record
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* the address.
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*/
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if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
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ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
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(eh->ether_shost[0] == 0 &&
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eh->ether_shost[1] == 0 &&
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eh->ether_shost[2] == 0 &&
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eh->ether_shost[3] == 0 &&
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eh->ether_shost[4] == 0 &&
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eh->ether_shost[5] == 0) == 0) {
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(void) bridge_rtupdate(sc, eh->ether_shost,
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src_if, 0, IFBAF_DYNAMIC);
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}
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/*
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* At this point, the port either doesn't participate
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* in spanning tree or it is in the forwarding state.
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*/
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/*
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* If the packet is unicast, destined for someone on
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* "this" side of the bridge, drop it.
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*/
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if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
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dst_if = bridge_rtlookup(sc, eh->ether_dhost);
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if (src_if == dst_if) {
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if ((bif->bif_flags & IFBIF_STP) != 0 &&
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bif->bif_state == BSTP_IFSTATE_LEARNING) {
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m_freem(m);
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return;
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continue;
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}
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/*
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* At this point, the port either doesn't participate
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* in spanning tree or it is in the forwarding state.
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*/
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/*
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* If the packet is unicast, destined for someone on
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* "this" side of the bridge, drop it.
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*/
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if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
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dst_if = bridge_rtlookup(sc, eh->ether_dhost);
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if (src_if == dst_if) {
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m_freem(m);
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continue;
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}
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} else {
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/* ...forward it to all interfaces. */
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sc->sc_if.if_imcasts++;
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dst_if = NULL;
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}
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} else {
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/* ...forward it to all interfaces. */
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sc->sc_if.if_imcasts++;
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dst_if = NULL;
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}
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#ifdef PFIL_HOOKS
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if (pfil_run_hooks(&sc->sc_if.if_pfil, &m,
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m->m_pkthdr.rcvif, PFIL_IN) != 0) {
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if (m != NULL)
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m_freem(m);
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return;
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}
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if (m == NULL)
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return;
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if (pfil_run_hooks(&sc->sc_if.if_pfil, &m,
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m->m_pkthdr.rcvif, PFIL_IN) != 0) {
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if (m != NULL)
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m_freem(m);
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continue;
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}
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if (m == NULL)
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continue;
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#endif /* PFIL_HOOKS */
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if (dst_if == NULL) {
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bridge_broadcast(sc, src_if, m);
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return;
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}
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/*
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* At this point, we're dealing with a unicast frame
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* going to a different interface.
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*/
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if ((dst_if->if_flags & IFF_RUNNING) == 0) {
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m_freem(m);
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return;
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}
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bif = bridge_lookup_member_if(sc, dst_if);
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if (bif == NULL) {
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/* Not a member of the bridge (anymore?) */
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m_freem(m);
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return;
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}
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if (bif->bif_flags & IFBIF_STP) {
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switch (bif->bif_state) {
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case BSTP_IFSTATE_DISABLED:
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case BSTP_IFSTATE_BLOCKING:
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m_freem(m);
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return;
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if (dst_if == NULL) {
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bridge_broadcast(sc, src_if, m);
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continue;
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}
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}
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bridge_enqueue(sc, dst_if, m, 1);
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/*
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* At this point, we're dealing with a unicast frame
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* going to a different interface.
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*/
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if ((dst_if->if_flags & IFF_RUNNING) == 0) {
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m_freem(m);
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continue;
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}
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bif = bridge_lookup_member_if(sc, dst_if);
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if (bif == NULL) {
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/* Not a member of the bridge (anymore?) */
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m_freem(m);
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continue;
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}
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if (bif->bif_flags & IFBIF_STP) {
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switch (bif->bif_state) {
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case BSTP_IFSTATE_DISABLED:
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case BSTP_IFSTATE_BLOCKING:
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m_freem(m);
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continue;
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}
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}
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bridge_enqueue(sc, dst_if, m, 1);
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}
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splx(s);
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}
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/*
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@ -1430,6 +1458,7 @@ bridge_forward(struct bridge_softc *sc, struct mbuf *m)
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*
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* Receive input from a member interface. Queue the packet for
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* bridging if it is not for us.
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* should be called at splbio()
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*/
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struct mbuf *
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bridge_input(struct ifnet *ifp, struct mbuf *m)
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@ -1471,12 +1500,17 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
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* for bridge processing; return the original packet for
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* local processing.
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*/
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if (IF_QFULL(&sc->sc_if.if_snd)) {
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IF_DROP(&sc->sc_if.if_snd);
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return (m);
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}
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mc = m_dup(m, 0, M_COPYALL, M_NOWAIT);
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if (mc == NULL)
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return (m);
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/* Perform the bridge forwarding function with the copy. */
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bridge_forward(sc, mc);
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IF_ENQUEUE(&sc->sc_if.if_snd, mc);
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softint_schedule(sc->sc_softintr);
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/* Return the original packet for local processing. */
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return (m);
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@ -1524,7 +1558,13 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
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}
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/* Perform the bridge forwarding function. */
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bridge_forward(sc, m);
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if (IF_QFULL(&sc->sc_if.if_snd)) {
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IF_DROP(&sc->sc_if.if_snd);
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m_freem(m);
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return (NULL);
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}
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IF_ENQUEUE(&sc->sc_if.if_snd, m);
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softint_schedule(sc->sc_softintr);
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return (NULL);
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}
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@ -2010,6 +2050,7 @@ bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
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/*
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* Check basic packet sanity and run IPF through pfil.
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*/
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KASSERT(!cpu_intr_p());
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switch (ether_type)
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{
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case ETHERTYPE_IP :
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@ -1,4 +1,4 @@
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/* $NetBSD: if_bridgevar.h,v 1.13 2009/01/18 10:28:55 mrg Exp $ */
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/* $NetBSD: if_bridgevar.h,v 1.14 2009/04/04 10:00:23 bouyer Exp $ */
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/*
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* Copyright 2001 Wasabi Systems, Inc.
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@ -301,6 +301,7 @@ struct bridge_softc {
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LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
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uint32_t sc_rthash_key; /* key for hash */
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uint32_t sc_filter_flags; /* ipf and flags */
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void *sc_softintr;
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};
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extern const uint8_t bstp_etheraddr[];
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