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freebsd-skq/sys/net/if_bridge.c
thompsa 079c3bb7eb Allow gif interfaces to be added as span ports, the user may want to send a 
copy of all packets to the other side of the world.
2006-06-20 21:28:18 +00:00

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/* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jason L. Wright
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp
*/
/*
* Network interface bridge support.
*
* TODO:
*
* - Currently only supports Ethernet-like interfaces (Ethernet,
* 802.11, VLANs on Ethernet, etc.) Figure out a nice way
* to bridge other types of interfaces (FDDI-FDDI, and maybe
* consider heterogenous bridges).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_carp.h"
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/protosw.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/socket.h> /* for net/if.h */
#include <sys/sockio.h>
#include <sys/ctype.h> /* string functions */
#include <sys/kernel.h>
#include <sys/random.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/pfil.h>
#include <netinet/in.h> /* for struct arpcom */
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#include <machine/in_cksum.h>
#include <netinet/if_ether.h> /* for struct arpcom */
#include <net/if_bridgevar.h>
#include <net/if_llc.h>
#include <net/route.h>
#include <netinet/ip_fw.h>
#include <netinet/ip_dummynet.h>
/*
* Size of the route hash table. Must be a power of two.
*/
#ifndef BRIDGE_RTHASH_SIZE
#define BRIDGE_RTHASH_SIZE 1024
#endif
#define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1)
/*
* Maximum number of addresses to cache.
*/
#ifndef BRIDGE_RTABLE_MAX
#define BRIDGE_RTABLE_MAX 100
#endif
/*
* Spanning tree defaults.
*/
#define BSTP_DEFAULT_MAX_AGE (20 * 256)
#define BSTP_DEFAULT_HELLO_TIME (2 * 256)
#define BSTP_DEFAULT_FORWARD_DELAY (15 * 256)
#define BSTP_DEFAULT_HOLD_TIME (1 * 256)
#define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000
#define BSTP_DEFAULT_PORT_PRIORITY 0x80
#define BSTP_DEFAULT_PATH_COST 55
/*
* Timeout (in seconds) for entries learned dynamically.
*/
#ifndef BRIDGE_RTABLE_TIMEOUT
#define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */
#endif
/*
* Number of seconds between walks of the route list.
*/
#ifndef BRIDGE_RTABLE_PRUNE_PERIOD
#define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60)
#endif
/*
* List of capabilities to mask on the member interface.
*/
#define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM
static struct mtx bridge_list_mtx;
eventhandler_tag bridge_detach_cookie = NULL;
int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
uma_zone_t bridge_rtnode_zone;
static int bridge_clone_create(struct if_clone *, int);
static void bridge_clone_destroy(struct ifnet *);
static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
static void bridge_mutecaps(struct bridge_iflist *, int);
static void bridge_ifdetach(void *arg __unused, struct ifnet *);
static void bridge_init(void *);
static void bridge_dummynet(struct mbuf *, struct ifnet *);
static void bridge_stop(struct ifnet *, int);
static void bridge_start(struct ifnet *);
static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void bridge_forward(struct bridge_softc *, struct mbuf *m);
static void bridge_timer(void *);
static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
struct mbuf *, int);
static void bridge_span(struct bridge_softc *, struct mbuf *);
static int bridge_rtupdate(struct bridge_softc *, const uint8_t *,
struct ifnet *, int, uint8_t);
static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *);
static void bridge_rttrim(struct bridge_softc *);
static void bridge_rtage(struct bridge_softc *);
static void bridge_rtflush(struct bridge_softc *, int);
static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
static int bridge_rtable_init(struct bridge_softc *);
static void bridge_rtable_fini(struct bridge_softc *);
static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *);
static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *,
const uint8_t *);
static int bridge_rtnode_insert(struct bridge_softc *,
struct bridge_rtnode *);
static void bridge_rtnode_destroy(struct bridge_softc *,
struct bridge_rtnode *);
static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *,
const char *name);
static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *,
struct ifnet *ifp);
static void bridge_delete_member(struct bridge_softc *,
struct bridge_iflist *, int);
static void bridge_delete_span(struct bridge_softc *,
struct bridge_iflist *);
static int bridge_ioctl_add(struct bridge_softc *, void *);
static int bridge_ioctl_del(struct bridge_softc *, void *);
static int bridge_ioctl_gifflags(struct bridge_softc *, void *);
static int bridge_ioctl_sifflags(struct bridge_softc *, void *);
static int bridge_ioctl_scache(struct bridge_softc *, void *);
static int bridge_ioctl_gcache(struct bridge_softc *, void *);
static int bridge_ioctl_gifs(struct bridge_softc *, void *);
static int bridge_ioctl_rts(struct bridge_softc *, void *);
static int bridge_ioctl_saddr(struct bridge_softc *, void *);
static int bridge_ioctl_sto(struct bridge_softc *, void *);
static int bridge_ioctl_gto(struct bridge_softc *, void *);
static int bridge_ioctl_daddr(struct bridge_softc *, void *);
static int bridge_ioctl_flush(struct bridge_softc *, void *);
static int bridge_ioctl_gpri(struct bridge_softc *, void *);
static int bridge_ioctl_spri(struct bridge_softc *, void *);
static int bridge_ioctl_ght(struct bridge_softc *, void *);
static int bridge_ioctl_sht(struct bridge_softc *, void *);
static int bridge_ioctl_gfd(struct bridge_softc *, void *);
static int bridge_ioctl_sfd(struct bridge_softc *, void *);
static int bridge_ioctl_gma(struct bridge_softc *, void *);
static int bridge_ioctl_sma(struct bridge_softc *, void *);
static int bridge_ioctl_sifprio(struct bridge_softc *, void *);
static int bridge_ioctl_sifcost(struct bridge_softc *, void *);
static int bridge_ioctl_addspan(struct bridge_softc *, void *);
static int bridge_ioctl_delspan(struct bridge_softc *, void *);
static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
int);
static int bridge_ip_checkbasic(struct mbuf **mp);
#ifdef INET6
static int bridge_ip6_checkbasic(struct mbuf **mp);
#endif /* INET6 */
static int bridge_fragment(struct ifnet *, struct mbuf *,
struct ether_header *, int, struct llc *);
SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */
static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */
static int pfil_member = 1; /* run pfil hooks on the member interface */
static int pfil_ipfw = 0; /* layer2 filter with ipfw */
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW,
&pfil_onlyip, 0, "Only pass IP packets when pfil is enabled");
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW,
&pfil_bridge, 0, "Packet filter on the bridge interface");
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW,
&pfil_member, 0, "Packet filter on the member interface");
struct bridge_control {
int (*bc_func)(struct bridge_softc *, void *);
int bc_argsize;
int bc_flags;
};
#define BC_F_COPYIN 0x01 /* copy arguments in */
#define BC_F_COPYOUT 0x02 /* copy arguments out */
#define BC_F_SUSER 0x04 /* do super-user check */
const struct bridge_control bridge_control_table[] = {
{ bridge_ioctl_add, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_del, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gifflags, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_COPYOUT },
{ bridge_ioctl_sifflags, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_scache, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gcache, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_gifs, sizeof(struct ifbifconf),
BC_F_COPYIN|BC_F_COPYOUT },
{ bridge_ioctl_rts, sizeof(struct ifbaconf),
BC_F_COPYIN|BC_F_COPYOUT },
{ bridge_ioctl_saddr, sizeof(struct ifbareq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_sto, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gto, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_daddr, sizeof(struct ifbareq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_flush, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gpri, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_spri, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_ght, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_sht, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gfd, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_sfd, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_gma, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_sma, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_sifprio, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_sifcost, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_addspan, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_delspan, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
};
const int bridge_control_table_size =
sizeof(bridge_control_table) / sizeof(bridge_control_table[0]);
static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
LIST_HEAD(, bridge_softc) bridge_list;
IFC_SIMPLE_DECLARE(bridge, 0);
static int
bridge_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF);
if_clone_attach(&bridge_cloner);
bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
LIST_INIT(&bridge_list);
bridge_input_p = bridge_input;
bridge_output_p = bridge_output;
bridge_dn_p = bridge_dummynet;
bstp_linkstate_p = bstp_linkstate;
bridge_detach_cookie = EVENTHANDLER_REGISTER(
ifnet_departure_event, bridge_ifdetach, NULL,
EVENTHANDLER_PRI_ANY);
break;
case MOD_UNLOAD:
EVENTHANDLER_DEREGISTER(ifnet_departure_event,
bridge_detach_cookie);
if_clone_detach(&bridge_cloner);
uma_zdestroy(bridge_rtnode_zone);
bridge_input_p = NULL;
bridge_output_p = NULL;
bridge_dn_p = NULL;
bstp_linkstate_p = NULL;
mtx_destroy(&bridge_list_mtx);
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t bridge_mod = {
"if_bridge",
bridge_modevent,
0
};
DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
/*
* handler for net.link.bridge.pfil_ipfw
*/
static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
{
int enable = pfil_ipfw;
int error;
error = sysctl_handle_int(oidp, &enable, 0, req);
enable = (enable) ? 1 : 0;
if (enable != pfil_ipfw) {
pfil_ipfw = enable;
/*
* Disable pfil so that ipfw doesnt run twice, if the user
* really wants both then they can re-enable pfil_bridge and/or
* pfil_member. Also allow non-ip packets as ipfw can filter by
* layer2 type.
*/
if (pfil_ipfw) {
pfil_onlyip = 0;
pfil_bridge = 0;
pfil_member = 0;
}
}
return (error);
}
SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW,
&pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW");
/*
* bridge_clone_create:
*
* Create a new bridge instance.
*/
static int
bridge_clone_create(struct if_clone *ifc, int unit)
{
struct bridge_softc *sc, *sc2;
struct ifnet *bifp, *ifp;
u_char eaddr[6];
int retry;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
BRIDGE_LOCK_INIT(sc);
ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
free(sc, M_DEVBUF);
return (ENOSPC);
}
sc->sc_brtmax = BRIDGE_RTABLE_MAX;
sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME;
sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME;
/* Initialize our routing table. */
bridge_rtable_init(sc);
callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
callout_init_mtx(&sc->sc_bstpcallout, &sc->sc_mtx, 0);
LIST_INIT(&sc->sc_iflist);
LIST_INIT(&sc->sc_spanlist);
ifp->if_softc = sc;
if_initname(ifp, ifc->ifc_name, unit);
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST;
ifp->if_ioctl = bridge_ioctl;
ifp->if_output = bridge_output;
ifp->if_start = bridge_start;
ifp->if_init = bridge_init;
ifp->if_type = IFT_BRIDGE;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
IFQ_SET_READY(&ifp->if_snd);
ifp->if_hdrlen = ETHER_HDR_LEN;
/*
* Generate a random ethernet address with a locally administered
* address.
*
* Since we are using random ethernet addresses for the bridge, it is
* possible that we might have address collisions, so make sure that
* this hardware address isn't already in use on another bridge.
*/
for (retry = 1; retry != 0;) {
arc4rand(eaddr, ETHER_ADDR_LEN, 1);
eaddr[0] &= ~1; /* clear multicast bit */
eaddr[0] |= 2; /* set the LAA bit */
retry = 0;
mtx_lock(&bridge_list_mtx);
LIST_FOREACH(sc2, &bridge_list, sc_list) {
bifp = sc2->sc_ifp;
if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0)
retry = 1;
}
mtx_unlock(&bridge_list_mtx);
}
ether_ifattach(ifp, eaddr);
/* Now undo some of the damage... */
ifp->if_baudrate = 0;
ifp->if_type = IFT_BRIDGE;
mtx_lock(&bridge_list_mtx);
LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
mtx_unlock(&bridge_list_mtx);
return (0);
}
/*
* bridge_clone_destroy:
*
* Destroy a bridge instance.
*/
static void
bridge_clone_destroy(struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_softc;
struct bridge_iflist *bif;
BRIDGE_LOCK(sc);
bridge_stop(ifp, 1);
ifp->if_flags &= ~IFF_UP;
while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
bridge_delete_member(sc, bif, 0);
while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) {
bridge_delete_span(sc, bif);
}
BRIDGE_UNLOCK(sc);
callout_drain(&sc->sc_brcallout);
callout_drain(&sc->sc_bstpcallout);
mtx_lock(&bridge_list_mtx);
LIST_REMOVE(sc, sc_list);
mtx_unlock(&bridge_list_mtx);
ether_ifdetach(ifp);
if_free_type(ifp, IFT_ETHER);
/* Tear down the routing table. */
bridge_rtable_fini(sc);
BRIDGE_LOCK_DESTROY(sc);
free(sc, M_DEVBUF);
}
/*
* bridge_ioctl:
*
* Handle a control request from the operator.
*/
static int
bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct bridge_softc *sc = ifp->if_softc;
struct thread *td = curthread;
union {
struct ifbreq ifbreq;
struct ifbifconf ifbifconf;
struct ifbareq ifbareq;
struct ifbaconf ifbaconf;
struct ifbrparam ifbrparam;
} args;
struct ifdrv *ifd = (struct ifdrv *) data;
const struct bridge_control *bc;
int error = 0;
BRIDGE_LOCK(sc);
switch (cmd) {
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGDRVSPEC:
case SIOCSDRVSPEC:
if (ifd->ifd_cmd >= bridge_control_table_size) {
error = EINVAL;
break;
}
bc = &bridge_control_table[ifd->ifd_cmd];
if (cmd == SIOCGDRVSPEC &&
(bc->bc_flags & BC_F_COPYOUT) == 0) {
error = EINVAL;
break;
}
else if (cmd == SIOCSDRVSPEC &&
(bc->bc_flags & BC_F_COPYOUT) != 0) {
error = EINVAL;
break;
}
if (bc->bc_flags & BC_F_SUSER) {
error = suser(td);
if (error)
break;
}
if (ifd->ifd_len != bc->bc_argsize ||
ifd->ifd_len > sizeof(args)) {
error = EINVAL;
break;
}
bzero(&args, sizeof(args));
if (bc->bc_flags & BC_F_COPYIN) {
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
if (error)
break;
}
error = (*bc->bc_func)(sc, &args);
if (error)
break;
if (bc->bc_flags & BC_F_COPYOUT)
error = copyout(&args, ifd->ifd_data, ifd->ifd_len);
break;
case SIOCSIFFLAGS:
if (!(ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
/*
* If interface is marked down and it is running,
* then stop and disable it.
*/
bridge_stop(ifp, 1);
} else if ((ifp->if_flags & IFF_UP) &&
!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
/*
* If interface is marked up and it is stopped, then
* start it.
*/
BRIDGE_UNLOCK(sc);
(*ifp->if_init)(sc);
}
break;
case SIOCSIFMTU:
/* Do not allow the MTU to be changed on the bridge */
error = EINVAL;
break;
default:
/*
* drop the lock as ether_ioctl() will call bridge_start() and
* cause the lock to be recursed.
*/
BRIDGE_UNLOCK(sc);
error = ether_ioctl(ifp, cmd, data);
break;
}
if (BRIDGE_LOCKED(sc))
BRIDGE_UNLOCK(sc);
return (error);
}
/*
* bridge_mutecaps:
*
* Clear or restore unwanted capabilities on the member interface
*/
static void
bridge_mutecaps(struct bridge_iflist *bif, int mute)
{
struct ifnet *ifp = bif->bif_ifp;
struct ifreq ifr;
int error;
if (ifp->if_ioctl == NULL)
return;
bzero(&ifr, sizeof(ifr));
ifr.ifr_reqcap = ifp->if_capenable;
if (mute) {
/* mask off and save capabilities */
bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK;
if (bif->bif_mutecap != 0)
ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK;
} else
/* restore muted capabilities */
ifr.ifr_reqcap |= bif->bif_mutecap;
if (bif->bif_mutecap != 0) {
IFF_LOCKGIANT(ifp);
error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
IFF_UNLOCKGIANT(ifp);
}
}
/*
* bridge_lookup_member:
*
* Lookup a bridge member interface.
*/
static struct bridge_iflist *
bridge_lookup_member(struct bridge_softc *sc, const char *name)
{
struct bridge_iflist *bif;
struct ifnet *ifp;
BRIDGE_LOCK_ASSERT(sc);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
ifp = bif->bif_ifp;
if (strcmp(ifp->if_xname, name) == 0)
return (bif);
}
return (NULL);
}
/*
* bridge_lookup_member_if:
*
* Lookup a bridge member interface by ifnet*.
*/
static struct bridge_iflist *
bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp)
{
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (bif->bif_ifp == member_ifp)
return (bif);
}
return (NULL);
}
/*
* bridge_delete_member:
*
* Delete the specified member interface.
*/
static void
bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
int gone)
{
struct ifnet *ifs = bif->bif_ifp;
BRIDGE_LOCK_ASSERT(sc);
if (!gone) {
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
/*
* Take the interface out of promiscuous mode.
*/
(void) ifpromisc(ifs, 0);
bridge_mutecaps(bif, 0);
break;
case IFT_GIF:
break;
default:
#ifdef DIAGNOSTIC
panic("bridge_delete_member: impossible");
#endif
break;
}
}
ifs->if_bridge = NULL;
BRIDGE_XLOCK(sc);
LIST_REMOVE(bif, bif_next);
BRIDGE_XDROP(sc);
bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
free(bif, M_DEVBUF);
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
}
/*
* bridge_delete_span:
*
* Delete the specified span interface.
*/
static void
bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif)
{
BRIDGE_LOCK_ASSERT(sc);
KASSERT(bif->bif_ifp->if_bridge == NULL,
("%s: not a span interface", __func__));
LIST_REMOVE(bif, bif_next);
free(bif, M_DEVBUF);
}
static int
bridge_ioctl_add(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif = NULL;
struct ifnet *ifs;
int error = 0;
BRIDGE_LOCK_ASSERT(sc);
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
/* If it's in the span list, it can't be a member. */
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifs == bif->bif_ifp)
return (EBUSY);
/* Allow the first Ethernet member to define the MTU */
if (ifs->if_type != IFT_GIF) {
if (LIST_EMPTY(&sc->sc_iflist))
sc->sc_ifp->if_mtu = ifs->if_mtu;
else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
if_printf(sc->sc_ifp, "invalid MTU for %s\n",
ifs->if_xname);
return (EINVAL);
}
}
if (ifs->if_bridge == sc)
return (EEXIST);
if (ifs->if_bridge != NULL)
return (EBUSY);
bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
if (bif == NULL)
return (ENOMEM);
bif->bif_ifp = ifs;
bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER;
bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY;
bif->bif_path_cost = BSTP_DEFAULT_PATH_COST;
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
/*
* Place the interface into promiscuous mode.
*/
error = ifpromisc(ifs, 1);
if (error)
goto out;
bridge_mutecaps(bif, 1);
break;
case IFT_GIF:
break;
default:
error = EINVAL;
goto out;
}
ifs->if_bridge = sc;
/*
* XXX: XLOCK HERE!?!
*
* NOTE: insert_***HEAD*** should be safe for the traversals.
*/
LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
else
bstp_stop(sc);
out:
if (error) {
if (bif != NULL)
free(bif, M_DEVBUF);
}
return (error);
}
static int
bridge_ioctl_del(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bridge_delete_member(sc, bif, 0);
return (0);
}
static int
bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
req->ifbr_ifsflags = bif->bif_flags;
req->ifbr_state = bif->bif_state;
req->ifbr_priority = bif->bif_priority;
req->ifbr_path_cost = bif->bif_path_cost;
req->ifbr_portno = bif->bif_ifp->if_index & 0xff;
return (0);
}
static int
bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
if (req->ifbr_ifsflags & IFBIF_SPAN)
/* SPAN is readonly */
return (EINVAL);
if (req->ifbr_ifsflags & IFBIF_STP) {
switch (bif->bif_ifp->if_type) {
case IFT_ETHER:
/* These can do spanning tree. */
break;
default:
/* Nothing else can. */
return (EINVAL);
}
}
bif->bif_flags = req->ifbr_ifsflags;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
sc->sc_brtmax = param->ifbrp_csize;
bridge_rttrim(sc);
return (0);
}
static int
bridge_ioctl_gcache(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_csize = sc->sc_brtmax;
return (0);
}
static int
bridge_ioctl_gifs(struct bridge_softc *sc, void *arg)
{
struct ifbifconf *bifc = arg;
struct bridge_iflist *bif;
struct ifbreq breq;
int count, len, error = 0;
BRIDGE_LOCK_ASSERT(sc);
count = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
count++;
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
count++;
if (bifc->ifbic_len == 0) {
bifc->ifbic_len = sizeof(breq) * count;
return (0);
}
count = 0;
len = bifc->ifbic_len;
bzero(&breq, sizeof(breq));
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (len < sizeof(breq))
break;
strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
sizeof(breq.ifbr_ifsname));
breq.ifbr_ifsflags = bif->bif_flags;
breq.ifbr_state = bif->bif_state;
breq.ifbr_priority = bif->bif_priority;
breq.ifbr_path_cost = bif->bif_path_cost;
breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
if (error)
break;
count++;
len -= sizeof(breq);
}
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
if (len < sizeof(breq))
break;
strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname,
sizeof(breq.ifbr_ifsname));
breq.ifbr_ifsflags = bif->bif_flags;
breq.ifbr_state = bif->bif_state;
breq.ifbr_priority = bif->bif_priority;
breq.ifbr_path_cost = bif->bif_path_cost;
breq.ifbr_portno = bif->bif_ifp->if_index & 0xff;
error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq));
if (error)
break;
count++;
len -= sizeof(breq);
}
bifc->ifbic_len = sizeof(breq) * count;
return (error);
}
static int
bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
{
struct ifbaconf *bac = arg;
struct bridge_rtnode *brt;
struct ifbareq bareq;
int count = 0, error = 0, len;
BRIDGE_LOCK_ASSERT(sc);
if (bac->ifbac_len == 0)
return (0);
len = bac->ifbac_len;
bzero(&bareq, sizeof(bareq));
LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
if (len < sizeof(bareq))
goto out;
strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname,
sizeof(bareq.ifba_ifsname));
memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr));
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
time_uptime < brt->brt_expire)
bareq.ifba_expire = brt->brt_expire - time_uptime;
else
bareq.ifba_expire = 0;
bareq.ifba_flags = brt->brt_flags;
error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq));
if (error)
goto out;
count++;
len -= sizeof(bareq);
}
out:
bac->ifbac_len = sizeof(bareq) * count;
return (error);
}
static int
bridge_ioctl_saddr(struct bridge_softc *sc, void *arg)
{
struct ifbareq *req = arg;
struct bridge_iflist *bif;
int error;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifba_ifsname);
if (bif == NULL)
return (ENOENT);
error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1,
req->ifba_flags);
return (error);
}
static int
bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
sc->sc_brttimeout = param->ifbrp_ctime;
return (0);
}
static int
bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_ctime = sc->sc_brttimeout;
return (0);
}
static int
bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
{
struct ifbareq *req = arg;
BRIDGE_LOCK_ASSERT(sc);
return (bridge_rtdaddr(sc, req->ifba_dst));
}
static int
bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
BRIDGE_LOCK_ASSERT(sc);
bridge_rtflush(sc, req->ifbr_ifsflags);
return (0);
}
static int
bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_prio = sc->sc_bridge_priority;
return (0);
}
static int
bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
sc->sc_bridge_priority = param->ifbrp_prio;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8;
return (0);
}
static int
bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
if (param->ifbrp_hellotime == 0)
return (EINVAL);
sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8;
return (0);
}
static int
bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
if (param->ifbrp_fwddelay == 0)
return (EINVAL);
sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
param->ifbrp_maxage = sc->sc_bridge_max_age >> 8;
return (0);
}
static int
bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
BRIDGE_LOCK_ASSERT(sc);
if (param->ifbrp_maxage == 0)
return (EINVAL);
sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bif->bif_priority = req->ifbr_priority;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
BRIDGE_LOCK_ASSERT(sc);
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bif->bif_path_cost = req->ifbr_path_cost;
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_addspan(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif = NULL;
struct ifnet *ifs;
BRIDGE_LOCK_ASSERT(sc);
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifs == bif->bif_ifp)
return (EBUSY);
if (ifs->if_bridge != NULL)
return (EBUSY);
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_GIF:
case IFT_L2VLAN:
break;
default:
return (EINVAL);
}
bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
if (bif == NULL)
return (ENOMEM);
bif->bif_ifp = ifs;
bif->bif_flags = IFBIF_SPAN;
LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
return (0);
}
static int
bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
struct ifnet *ifs;
BRIDGE_LOCK_ASSERT(sc);
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifs == bif->bif_ifp)
break;
if (bif == NULL)
return (ENOENT);
bridge_delete_span(sc, bif);
return (0);
}
/*
* bridge_ifdetach:
*
* Detach an interface from a bridge. Called when a member
* interface is detaching.
*/
static void
bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_bridge;
struct bridge_iflist *bif;
/* Check if the interface is a bridge member */
if (sc != NULL) {
BRIDGE_LOCK(sc);
bif = bridge_lookup_member_if(sc, ifp);
if (bif != NULL)
bridge_delete_member(sc, bif, 1);
BRIDGE_UNLOCK(sc);
return;
}
/* Check if the interface is a span port */
mtx_lock(&bridge_list_mtx);
LIST_FOREACH(sc, &bridge_list, sc_list) {
BRIDGE_LOCK(sc);
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifp == bif->bif_ifp) {
bridge_delete_span(sc, bif);
break;
}
BRIDGE_UNLOCK(sc);
}
mtx_unlock(&bridge_list_mtx);
}
/*
* bridge_init:
*
* Initialize a bridge interface.
*/
static void
bridge_init(void *xsc)
{
struct bridge_softc *sc = (struct bridge_softc *)xsc;
struct ifnet *ifp = sc->sc_ifp;
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
return;
BRIDGE_LOCK(sc);
callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
bridge_timer, sc);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
bstp_initialization(sc);
BRIDGE_UNLOCK(sc);
}
/*
* bridge_stop:
*
* Stop the bridge interface.
*/
static void
bridge_stop(struct ifnet *ifp, int disable)
{
struct bridge_softc *sc = ifp->if_softc;
BRIDGE_LOCK_ASSERT(sc);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
callout_stop(&sc->sc_brcallout);
bstp_stop(sc);
bridge_rtflush(sc, IFBF_FLUSHDYN);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
/*
* bridge_enqueue:
*
* Enqueue a packet on a bridge member interface.
*
*/
__inline void
bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
{
int len, err = 0;
short mflags;
struct mbuf *m0;
len = m->m_pkthdr.len;
mflags = m->m_flags;
/* We may be sending a fragment so traverse the mbuf */
for (; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = NULL;
if (err == 0)
IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
}
if (err == 0) {
sc->sc_ifp->if_opackets++;
sc->sc_ifp->if_obytes += len;
dst_ifp->if_obytes += len;
if (mflags & M_MCAST) {
sc->sc_ifp->if_omcasts++;
dst_ifp->if_omcasts++;
}
}
if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
(*dst_ifp->if_start)(dst_ifp);
}
/*
* bridge_dummynet:
*
* Receive a queued packet from dummynet and pass it on to the output
* interface.
*
* The mbuf has the Ethernet header already attached.
*/
static void
bridge_dummynet(struct mbuf *m, struct ifnet *ifp)
{
struct bridge_softc *sc;
sc = ifp->if_bridge;
/*
* The packet didnt originate from a member interface. This should only
* ever happen if a member interface is removed while packets are
* queued for it.
*/
if (sc == NULL) {
m_freem(m);
return;
}
if (PFIL_HOOKED(&inet_pfil_hook)
#ifdef INET6
|| PFIL_HOOKED(&inet6_pfil_hook)
#endif
) {
if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0)
return;
if (m == NULL)
return;
}
bridge_enqueue(sc, ifp, m);
}
/*
* bridge_output:
*
* Send output from a bridge member interface. This
* performs the bridging function for locally originated
* packets.
*
* The mbuf has the Ethernet header already attached. We must
* enqueue or free the mbuf before returning.
*/
static int
bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
struct rtentry *rt)
{
struct ether_header *eh;
struct ifnet *dst_if;
struct bridge_softc *sc;
if (m->m_len < ETHER_HDR_LEN) {
m = m_pullup(m, ETHER_HDR_LEN);
if (m == NULL)
return (0);
}
eh = mtod(m, struct ether_header *);
sc = ifp->if_bridge;
BRIDGE_LOCK(sc);
/*
* If bridge is down, but the original output interface is up,
* go ahead and send out that interface. Otherwise, the packet
* is dropped below.
*/
if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
dst_if = ifp;
goto sendunicast;
}
/*
* If the packet is a multicast, or we don't know a better way to
* get there, send to all interfaces.
*/
if (ETHER_IS_MULTICAST(eh->ether_dhost))
dst_if = NULL;
else
dst_if = bridge_rtlookup(sc, eh->ether_dhost);
if (dst_if == NULL) {
struct bridge_iflist *bif;
struct mbuf *mc;
int error = 0, used = 0;
BRIDGE_LOCK2REF(sc, error);
if (error) {
m_freem(m);
return (0);
}
bridge_span(sc, m);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
dst_if = bif->bif_ifp;
if (dst_if->if_type == IFT_GIF)
continue;
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
continue;
/*
* If this is not the original output interface,
* and the interface is participating in spanning
* tree, make sure the port is in a state that
* allows forwarding.
*/
if (dst_if != ifp &&
(bif->bif_flags & IFBIF_STP) != 0) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
continue;
}
}
if (LIST_NEXT(bif, bif_next) == NULL) {
used = 1;
mc = m;
} else {
mc = m_copypacket(m, M_DONTWAIT);
if (mc == NULL) {
sc->sc_ifp->if_oerrors++;
continue;
}
}
bridge_enqueue(sc, dst_if, mc);
}
if (used == 0)
m_freem(m);
BRIDGE_UNREF(sc);
return (0);
}
sendunicast:
/*
* XXX Spanning tree consideration here?
*/
bridge_span(sc, m);
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
m_freem(m);
BRIDGE_UNLOCK(sc);
return (0);
}
BRIDGE_UNLOCK(sc);
bridge_enqueue(sc, dst_if, m);
return (0);
}
/*
* bridge_start:
*
* Start output on a bridge.
*
*/
static void
bridge_start(struct ifnet *ifp)
{
struct bridge_softc *sc;
struct mbuf *m;
struct ether_header *eh;
struct ifnet *dst_if;
sc = ifp->if_softc;
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == 0)
break;
BPF_MTAP(ifp, m);
eh = mtod(m, struct ether_header *);
dst_if = NULL;
BRIDGE_LOCK(sc);
if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
dst_if = bridge_rtlookup(sc, eh->ether_dhost);
}
if (dst_if == NULL)
bridge_broadcast(sc, ifp, m, 0);
else {
BRIDGE_UNLOCK(sc);
bridge_enqueue(sc, dst_if, m);
}
}
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
}
/*
* bridge_forward:
*
* The forwarding function of the bridge.
*
* NOTE: Releases the lock on return.
*/
static void
bridge_forward(struct bridge_softc *sc, struct mbuf *m)
{
struct bridge_iflist *bif;
struct ifnet *src_if, *dst_if, *ifp;
struct ether_header *eh;
src_if = m->m_pkthdr.rcvif;
BRIDGE_LOCK_ASSERT(sc);
ifp = sc->sc_ifp;
sc->sc_ifp->if_ipackets++;
sc->sc_ifp->if_ibytes += m->m_pkthdr.len;
/*
* Look up the bridge_iflist.
*/
bif = bridge_lookup_member_if(sc, src_if);
if (bif == NULL) {
/* Interface is not a bridge member (anymore?) */
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
}
eh = mtod(m, struct ether_header *);
/*
* If the interface is learning, and the source
* address is valid and not multicast, record
* the address.
*/
if ((bif->bif_flags & IFBIF_LEARNING) != 0 &&
ETHER_IS_MULTICAST(eh->ether_shost) == 0 &&
(eh->ether_shost[0] == 0 &&
eh->ether_shost[1] == 0 &&
eh->ether_shost[2] == 0 &&
eh->ether_shost[3] == 0 &&
eh->ether_shost[4] == 0 &&
eh->ether_shost[5] == 0) == 0) {
(void) bridge_rtupdate(sc, eh->ether_shost,
src_if, 0, IFBAF_DYNAMIC);
}
if ((bif->bif_flags & IFBIF_STP) != 0 &&
bif->bif_state == BSTP_IFSTATE_LEARNING) {
m_freem(m);
BRIDGE_UNLOCK(sc);
return;
}
/*
* At this point, the port either doesn't participate
* in spanning tree or it is in the forwarding state.
*/
/*
* If the packet is unicast, destined for someone on
* "this" side of the bridge, drop it.
*/
if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) {
dst_if = bridge_rtlookup(sc, eh->ether_dhost);
if (src_if == dst_if) {
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
} else {
/* ...forward it to all interfaces. */
sc->sc_ifp->if_imcasts++;
dst_if = NULL;
}
/*
* If we have a destination interface which is a member of our bridge,
* OR this is a unicast packet, push it through the bpf(4) machinery.
* For broadcast or multicast packets, don't bother because it will
* be reinjected into ether_input. We do this before we pass the packets
* through the pfil(9) framework, as it is possible that pfil(9) will
* drop the packet, or possibly modify it, making it difficult to debug
* firewall issues on the bridge.
*/
if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0)
BPF_MTAP(ifp, m);
/* run the packet filter */
if (PFIL_HOOKED(&inet_pfil_hook)
#ifdef INET6
|| PFIL_HOOKED(&inet6_pfil_hook)
#endif
) {
BRIDGE_UNLOCK(sc);
if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0)
return;
if (m == NULL)
return;
BRIDGE_LOCK(sc);
}
if (dst_if == NULL) {
bridge_broadcast(sc, src_if, m, 1);
return;
}
/*
* At this point, we're dealing with a unicast frame
* going to a different interface.
*/
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
bif = bridge_lookup_member_if(sc, dst_if);
if (bif == NULL) {
/* Not a member of the bridge (anymore?) */
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_DISABLED:
case BSTP_IFSTATE_BLOCKING:
BRIDGE_UNLOCK(sc);
m_freem(m);
return;
}
}
BRIDGE_UNLOCK(sc);
if (PFIL_HOOKED(&inet_pfil_hook)
#ifdef INET6
|| PFIL_HOOKED(&inet6_pfil_hook)
#endif
) {
if (bridge_pfil(&m, sc->sc_ifp, dst_if, PFIL_OUT) != 0)
return;
if (m == NULL)
return;
}
bridge_enqueue(sc, dst_if, m);
}
/*
* bridge_input:
*
* Receive input from a member interface. Queue the packet for
* bridging if it is not for us.
*/
static struct mbuf *
bridge_input(struct ifnet *ifp, struct mbuf *m)
{
struct bridge_softc *sc = ifp->if_bridge;
struct bridge_iflist *bif;
struct ifnet *bifp;
struct ether_header *eh;
struct mbuf *mc, *mc2;
if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return (m);
bifp = sc->sc_ifp;
/*
* Implement support for bridge monitoring. If this flag has been
* set on this interface, discard the packet once we push it through
* the bpf(4) machinery, but before we do, increment the byte and
* packet counters associated with this interface.
*/
if ((bifp->if_flags & IFF_MONITOR) != 0) {
m->m_pkthdr.rcvif = bifp;
BPF_MTAP(bifp, m);
bifp->if_ipackets++;
bifp->if_ibytes += m->m_pkthdr.len;
m_free(m);
return (NULL);
}
BRIDGE_LOCK(sc);
bif = bridge_lookup_member_if(sc, ifp);
if (bif == NULL) {
BRIDGE_UNLOCK(sc);
return (m);
}
eh = mtod(m, struct ether_header *);
if (memcmp(eh->ether_dhost, IF_LLADDR(bifp),
ETHER_ADDR_LEN) == 0) {
/*
* If the packet is for us, set the packets source as the
* bridge, and return the packet back to ether_input for
* local processing.
*/
/* Mark the packet as arriving on the bridge interface */
m->m_pkthdr.rcvif = bifp;
BPF_MTAP(bifp, m);
bifp->if_ipackets++;
BRIDGE_UNLOCK(sc);
return (m);
}
bridge_span(sc, m);
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
/* Tap off 802.1D packets; they do not get forwarded. */
if (memcmp(eh->ether_dhost, bstp_etheraddr,
ETHER_ADDR_LEN) == 0) {
m = bstp_input(ifp, m);
if (m == NULL) {
BRIDGE_UNLOCK(sc);
return (NULL);
}
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
BRIDGE_UNLOCK(sc);
return (m);
}
}
if (bcmp(etherbroadcastaddr, eh->ether_dhost,
sizeof(etherbroadcastaddr)) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
/*
* Make a deep copy of the packet and enqueue the copy
* for bridge processing; return the original packet for
* local processing.
*/
mc = m_dup(m, M_DONTWAIT);
if (mc == NULL) {
BRIDGE_UNLOCK(sc);
return (m);
}
/* Perform the bridge forwarding function with the copy. */
bridge_forward(sc, mc);
/*
* Reinject the mbuf as arriving on the bridge so we have a
* chance at claiming multicast packets. We can not loop back
* here from ether_input as a bridge is never a member of a
* bridge.
*/
KASSERT(bifp->if_bridge == NULL,
("loop created in bridge_input"));
mc2 = m_dup(m, M_DONTWAIT);
if (mc2 != NULL) {
/* Keep the layer3 header aligned */
int i = min(mc2->m_pkthdr.len, max_protohdr);
mc2 = m_copyup(mc2, i, ETHER_ALIGN);
}
if (mc2 != NULL) {
mc2->m_pkthdr.rcvif = bifp;
(*bifp->if_input)(bifp, mc2);
}
/* Return the original packet for local processing. */
return (m);
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
BRIDGE_UNLOCK(sc);
return (m);
}
}
/*
* Unicast. Make sure it's not for us.
*/
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (bif->bif_ifp->if_type == IFT_GIF)
continue;
/* It is destined for us. */
if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost,
ETHER_ADDR_LEN) == 0
#ifdef DEV_CARP
|| (bif->bif_ifp->if_carp
&& carp_forus(bif->bif_ifp->if_carp, eh->ether_dhost))
#endif
) {
if (bif->bif_flags & IFBIF_LEARNING)
(void) bridge_rtupdate(sc,
eh->ether_shost, ifp, 0, IFBAF_DYNAMIC);
m->m_pkthdr.rcvif = bif->bif_ifp;
BRIDGE_UNLOCK(sc);
return (m);
}
/* We just received a packet that we sent out. */
if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost,
ETHER_ADDR_LEN) == 0
#ifdef DEV_CARP
|| (bif->bif_ifp->if_carp
&& carp_forus(bif->bif_ifp->if_carp, eh->ether_shost))
#endif
) {
BRIDGE_UNLOCK(sc);
m_freem(m);
return (NULL);
}
}
/* Perform the bridge forwarding function. */
bridge_forward(sc, m);
return (NULL);
}
/*
* bridge_broadcast:
*
* Send a frame to all interfaces that are members of
* the bridge, except for the one on which the packet
* arrived.
*
* NOTE: Releases the lock on return.
*/
static void
bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
struct mbuf *m, int runfilt)
{
struct bridge_iflist *bif;
struct mbuf *mc;
struct ifnet *dst_if;
int error = 0, used = 0, i;
BRIDGE_LOCK_ASSERT(sc);
BRIDGE_LOCK2REF(sc, error);
if (error) {
m_freem(m);
return;
}
/* Filter on the bridge interface before broadcasting */
if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
#ifdef INET6
|| PFIL_HOOKED(&inet6_pfil_hook)
#endif
)) {
if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
goto out;
if (m == NULL)
goto out;
}
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
dst_if = bif->bif_ifp;
if (dst_if == src_if)
continue;
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_DISABLED:
continue;
}
}
if ((bif->bif_flags & IFBIF_DISCOVER) == 0 &&
(m->m_flags & (M_BCAST|M_MCAST)) == 0)
continue;
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
continue;
if (LIST_NEXT(bif, bif_next) == NULL) {
mc = m;
used = 1;
} else {
mc = m_dup(m, M_DONTWAIT);
if (mc == NULL) {
sc->sc_ifp->if_oerrors++;
continue;
}
}
/*
* Filter on the output interface. Pass a NULL bridge interface
* pointer so we do not redundantly filter on the bridge for
* each interface we broadcast on.
*/
if (runfilt && (PFIL_HOOKED(&inet_pfil_hook)
#ifdef INET6
|| PFIL_HOOKED(&inet6_pfil_hook)
#endif
)) {
if (used == 0) {
/* Keep the layer3 header aligned */
i = min(mc->m_pkthdr.len, max_protohdr);
mc = m_copyup(mc, i, ETHER_ALIGN);
if (mc == NULL) {
sc->sc_ifp->if_oerrors++;
continue;
}
}
if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
continue;
if (mc == NULL)
continue;
}
bridge_enqueue(sc, dst_if, mc);
}
if (used == 0)
m_freem(m);
out:
BRIDGE_UNREF(sc);
}
/*
* bridge_span:
*
* Duplicate a packet out one or more interfaces that are in span mode,
* the original mbuf is unmodified.
*/
static void
bridge_span(struct bridge_softc *sc, struct mbuf *m)
{
struct bridge_iflist *bif;
struct ifnet *dst_if;
struct mbuf *mc;
if (LIST_EMPTY(&sc->sc_spanlist))
return;
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
dst_if = bif->bif_ifp;
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
continue;
mc = m_copypacket(m, M_DONTWAIT);
if (mc == NULL) {
sc->sc_ifp->if_oerrors++;
continue;
}
bridge_enqueue(sc, dst_if, mc);
}
}
/*
* bridge_rtupdate:
*
* Add a bridge routing entry.
*/
static int
bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst,
struct ifnet *dst_if, int setflags, uint8_t flags)
{
struct bridge_rtnode *brt;
int error;
BRIDGE_LOCK_ASSERT(sc);
/*
* A route for this destination might already exist. If so,
* update it, otherwise create a new one.
*/
if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) {
if (sc->sc_brtcnt >= sc->sc_brtmax)
return (ENOSPC);
/*
* Allocate a new bridge forwarding node, and
* initialize the expiration time and Ethernet
* address.
*/
brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO);
if (brt == NULL)
return (ENOMEM);
brt->brt_flags = IFBAF_DYNAMIC;
memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
uma_zfree(bridge_rtnode_zone, brt);
return (error);
}
}
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
brt->brt_ifp = dst_if;
if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
brt->brt_expire = time_uptime + sc->sc_brttimeout;
if (setflags)
brt->brt_flags = flags;
return (0);
}
/*
* bridge_rtlookup:
*
* Lookup the destination interface for an address.
*/
static struct ifnet *
bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr)
{
struct bridge_rtnode *brt;
BRIDGE_LOCK_ASSERT(sc);
if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
return (NULL);
return (brt->brt_ifp);
}
/*
* bridge_rttrim:
*
* Trim the routine table so that we have a number
* of routing entries less than or equal to the
* maximum number.
*/
static void
bridge_rttrim(struct bridge_softc *sc)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
/* Make sure we actually need to do this. */
if (sc->sc_brtcnt <= sc->sc_brtmax)
return;
/* Force an aging cycle; this might trim enough addresses. */
bridge_rtage(sc);
if (sc->sc_brtcnt <= sc->sc_brtmax)
return;
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
nbrt = LIST_NEXT(brt, brt_list);
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
bridge_rtnode_destroy(sc, brt);
if (sc->sc_brtcnt <= sc->sc_brtmax)
return;
}
}
}
/*
* bridge_timer:
*
* Aging timer for the bridge.
*/
static void
bridge_timer(void *arg)
{
struct bridge_softc *sc = arg;
BRIDGE_LOCK_ASSERT(sc);
bridge_rtage(sc);
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
callout_reset(&sc->sc_brcallout,
bridge_rtable_prune_period * hz, bridge_timer, sc);
}
/*
* bridge_rtage:
*
* Perform an aging cycle.
*/
static void
bridge_rtage(struct bridge_softc *sc)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
nbrt = LIST_NEXT(brt, brt_list);
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
if (time_uptime >= brt->brt_expire)
bridge_rtnode_destroy(sc, brt);
}
}
}
/*
* bridge_rtflush:
*
* Remove all dynamic addresses from the bridge.
*/
static void
bridge_rtflush(struct bridge_softc *sc, int full)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
nbrt = LIST_NEXT(brt, brt_list);
if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
bridge_rtnode_destroy(sc, brt);
}
}
/*
* bridge_rtdaddr:
*
* Remove an address from the table.
*/
static int
bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr)
{
struct bridge_rtnode *brt;
BRIDGE_LOCK_ASSERT(sc);
if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL)
return (ENOENT);
bridge_rtnode_destroy(sc, brt);
return (0);
}
/*
* bridge_rtdelete:
*
* Delete routes to a speicifc member interface.
*/
void
bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) {
nbrt = LIST_NEXT(brt, brt_list);
if (brt->brt_ifp == ifp && (full ||
(brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC))
bridge_rtnode_destroy(sc, brt);
}
}
/*
* bridge_rtable_init:
*
* Initialize the route table for this bridge.
*/
static int
bridge_rtable_init(struct bridge_softc *sc)
{
int i;
sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
M_DEVBUF, M_NOWAIT);
if (sc->sc_rthash == NULL)
return (ENOMEM);
for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
LIST_INIT(&sc->sc_rthash[i]);
sc->sc_rthash_key = arc4random();
LIST_INIT(&sc->sc_rtlist);
return (0);
}
/*
* bridge_rtable_fini:
*
* Deconstruct the route table for this bridge.
*/
static void
bridge_rtable_fini(struct bridge_softc *sc)
{
free(sc->sc_rthash, M_DEVBUF);
}
/*
* The following hash function is adapted from "Hash Functions" by Bob Jenkins
* ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
*/
#define mix(a, b, c) \
do { \
a -= b; a -= c; a ^= (c >> 13); \
b -= c; b -= a; b ^= (a << 8); \
c -= a; c -= b; c ^= (b >> 13); \
a -= b; a -= c; a ^= (c >> 12); \
b -= c; b -= a; b ^= (a << 16); \
c -= a; c -= b; c ^= (b >> 5); \
a -= b; a -= c; a ^= (c >> 3); \
b -= c; b -= a; b ^= (a << 10); \
c -= a; c -= b; c ^= (b >> 15); \
} while (/*CONSTCOND*/0)
static __inline uint32_t
bridge_rthash(struct bridge_softc *sc, const uint8_t *addr)
{
uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key;
b += addr[5] << 8;
b += addr[4];
a += addr[3] << 24;
a += addr[2] << 16;
a += addr[1] << 8;
a += addr[0];
mix(a, b, c);
return (c & BRIDGE_RTHASH_MASK);
}
#undef mix
static int
bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b)
{
int i, d;
for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) {
d = ((int)a[i]) - ((int)b[i]);
}
return (d);
}
/*
* bridge_rtnode_lookup:
*
* Look up a bridge route node for the specified destination.
*/
static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr)
{
struct bridge_rtnode *brt;
uint32_t hash;
int dir;
BRIDGE_LOCK_ASSERT(sc);
hash = bridge_rthash(sc, addr);
LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr);
if (dir == 0)
return (brt);
if (dir > 0)
return (NULL);
}
return (NULL);
}
/*
* bridge_rtnode_insert:
*
* Insert the specified bridge node into the route table. We
* assume the entry is not already in the table.
*/
static int
bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt)
{
struct bridge_rtnode *lbrt;
uint32_t hash;
int dir;
BRIDGE_LOCK_ASSERT(sc);
hash = bridge_rthash(sc, brt->brt_addr);
lbrt = LIST_FIRST(&sc->sc_rthash[hash]);
if (lbrt == NULL) {
LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash);
goto out;
}
do {
dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr);
if (dir == 0)
return (EEXIST);
if (dir > 0) {
LIST_INSERT_BEFORE(lbrt, brt, brt_hash);
goto out;
}
if (LIST_NEXT(lbrt, brt_hash) == NULL) {
LIST_INSERT_AFTER(lbrt, brt, brt_hash);
goto out;
}
lbrt = LIST_NEXT(lbrt, brt_hash);
} while (lbrt != NULL);
#ifdef DIAGNOSTIC
panic("bridge_rtnode_insert: impossible");
#endif
out:
LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list);
sc->sc_brtcnt++;
return (0);
}
/*
* bridge_rtnode_destroy:
*
* Destroy a bridge rtnode.
*/
static void
bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt)
{
BRIDGE_LOCK_ASSERT(sc);
LIST_REMOVE(brt, brt_hash);
LIST_REMOVE(brt, brt_list);
sc->sc_brtcnt--;
uma_zfree(bridge_rtnode_zone, brt);
}
/*
* Send bridge packets through pfil if they are one of the types pfil can deal
* with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
* question.) If *bifp or *ifp are NULL then packet filtering is skipped for
* that interface.
*/
static int
bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
{
int snap, error, i, hlen;
struct ether_header *eh1, eh2;
struct ip_fw_args args;
struct ip *ip;
struct llc llc1;
u_int16_t ether_type;
snap = 0;
error = -1; /* Default error if not error == 0 */
/* we may return with the IP fields swapped, ensure its not shared */
KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0)
return (0); /* filtering is disabled */
i = min((*mp)->m_pkthdr.len, max_protohdr);
if ((*mp)->m_len < i) {
*mp = m_pullup(*mp, i);
if (*mp == NULL) {
printf("%s: m_pullup failed\n", __func__);
return (-1);
}
}
eh1 = mtod(*mp, struct ether_header *);
ether_type = ntohs(eh1->ether_type);
/*
* Check for SNAP/LLC.
*/
if (ether_type < ETHERMTU) {
struct llc *llc2 = (struct llc *)(eh1 + 1);
if ((*mp)->m_len >= ETHER_HDR_LEN + 8 &&
llc2->llc_dsap == LLC_SNAP_LSAP &&
llc2->llc_ssap == LLC_SNAP_LSAP &&
llc2->llc_control == LLC_UI) {
ether_type = htons(llc2->llc_un.type_snap.ether_type);
snap = 1;
}
}
/*
* If we're trying to filter bridge traffic, don't look at anything
* other than IP and ARP traffic. If the filter doesn't understand
* IPv6, don't allow IPv6 through the bridge either. This is lame
* since if we really wanted, say, an AppleTalk filter, we are hosed,
* but of course we don't have an AppleTalk filter to begin with.
* (Note that since pfil doesn't understand ARP it will pass *ALL*
* ARP traffic.)
*/
switch (ether_type) {
case ETHERTYPE_ARP:
case ETHERTYPE_REVARP:
return (0); /* Automatically pass */
case ETHERTYPE_IP:
#ifdef INET6
case ETHERTYPE_IPV6:
#endif /* INET6 */
break;
default:
/*
* Check to see if the user wants to pass non-ip
* packets, these will not be checked by pfil(9) and
* passed unconditionally so the default is to drop.
*/
if (pfil_onlyip)
goto bad;
}
/* Strip off the Ethernet header and keep a copy. */
m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2);
m_adj(*mp, ETHER_HDR_LEN);
/* Strip off snap header, if present */
if (snap) {
m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1);
m_adj(*mp, sizeof(struct llc));
}
/*
* Check the IP header for alignment and errors
*/
if (dir == PFIL_IN) {
switch (ether_type) {
case ETHERTYPE_IP:
error = bridge_ip_checkbasic(mp);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
error = bridge_ip6_checkbasic(mp);
break;
#endif /* INET6 */
default:
error = 0;
}
if (error)
goto bad;
}
if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) {
error = -1;
args.rule = ip_dn_claim_rule(*mp);
if (args.rule != NULL && fw_one_pass)
goto ipfwpass; /* packet already partially processed */
args.m = *mp;
args.oif = ifp;
args.next_hop = NULL;
args.eh = &eh2;
args.inp = NULL; /* used by ipfw uid/gid/jail rules */
i = ip_fw_chk_ptr(&args);
*mp = args.m;
if (*mp == NULL)
return (error);
if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) {
/* put the Ethernet header back on */
M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
if (*mp == NULL)
return (error);
bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
/*
* Pass the pkt to dummynet, which consumes it. The
* packet will return to us via bridge_dummynet().
*/
args.oif = ifp;
ip_dn_io_ptr(*mp, DN_TO_IFB_FWD, &args);
return (error);
}
if (i != IP_FW_PASS) /* drop */
goto bad;
}
ipfwpass:
error = 0;
/*
* Run the packet through pfil
*/
switch (ether_type) {
case ETHERTYPE_IP:
/*
* before calling the firewall, swap fields the same as
* IP does. here we assume the header is contiguous
*/
ip = mtod(*mp, struct ip *);
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
/*
* Run pfil on the member interface and the bridge, both can
* be skipped by clearing pfil_member or pfil_bridge.
*
* Keep the order:
* in_if -> bridge_if -> out_if
*/
if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_member && ifp != NULL)
error = pfil_run_hooks(&inet_pfil_hook, mp, ifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
error = pfil_run_hooks(&inet_pfil_hook, mp, bifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
/* check if we need to fragment the packet */
if (pfil_member && ifp != NULL && dir == PFIL_OUT) {
i = (*mp)->m_pkthdr.len;
if (i > ifp->if_mtu) {
error = bridge_fragment(ifp, *mp, &eh2, snap,
&llc1);
return (error);
}
}
/* Recalculate the ip checksum and restore byte ordering */
ip = mtod(*mp, struct ip *);
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip))
goto bad;
if (hlen > (*mp)->m_len) {
if ((*mp = m_pullup(*mp, hlen)) == 0)
goto bad;
ip = mtod(*mp, struct ip *);
if (ip == NULL)
goto bad;
}
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
ip->ip_sum = 0;
if (hlen == sizeof(struct ip))
ip->ip_sum = in_cksum_hdr(ip);
else
ip->ip_sum = in_cksum(*mp, hlen);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
if (pfil_bridge && dir == PFIL_OUT && bifp != NULL)
error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_member && ifp != NULL)
error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp,
dir, NULL);
if (*mp == NULL || error != 0) /* filter may consume */
break;
if (pfil_bridge && dir == PFIL_IN && bifp != NULL)
error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp,
dir, NULL);
break;
#endif
default:
error = 0;
break;
}
if (*mp == NULL)
return (error);
if (error != 0)
goto bad;
error = -1;
/*
* Finally, put everything back the way it was and return
*/
if (snap) {
M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT);
if (*mp == NULL)
return (error);
bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
}
M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
if (*mp == NULL)
return (error);
bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN);
return (0);
bad:
m_freem(*mp);
*mp = NULL;
return (error);
}
/*
* Perform basic checks on header size since
* pfil assumes ip_input has already processed
* it for it. Cut-and-pasted from ip_input.c.
* Given how simple the IPv6 version is,
* does the IPv4 version really need to be
* this complicated?
*
* XXX Should we update ipstat here, or not?
* XXX Right now we update ipstat but not
* XXX csum_counter.
*/
static int
bridge_ip_checkbasic(struct mbuf **mp)
{
struct mbuf *m = *mp;
struct ip *ip;
int len, hlen;
u_short sum;
if (*mp == NULL)
return (-1);
if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
if ((m = m_copyup(m, sizeof(struct ip),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
ipstat.ips_toosmall++;
goto bad;
}
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
ipstat.ips_toosmall++;
goto bad;
}
}
ip = mtod(m, struct ip *);
if (ip == NULL) goto bad;
if (ip->ip_v != IPVERSION) {
ipstat.ips_badvers++;
goto bad;
}
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) { /* minimum header length */
ipstat.ips_badhlen++;
goto bad;
}
if (hlen > m->m_len) {
if ((m = m_pullup(m, hlen)) == 0) {
ipstat.ips_badhlen++;
goto bad;
}
ip = mtod(m, struct ip *);
if (ip == NULL) goto bad;
}
if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
} else {
if (hlen == sizeof(struct ip)) {
sum = in_cksum_hdr(ip);
} else {
sum = in_cksum(m, hlen);
}
}
if (sum) {
ipstat.ips_badsum++;
goto bad;
}
/* Retrieve the packet length. */
len = ntohs(ip->ip_len);
/*
* Check for additional length bogosity
*/
if (len < hlen) {
ipstat.ips_badlen++;
goto bad;
}
/*
* Check that the amount of data in the buffers
* is as at least much as the IP header would have us expect.
* Drop packet if shorter than we expect.
*/
if (m->m_pkthdr.len < len) {
ipstat.ips_tooshort++;
goto bad;
}
/* Checks out, proceed */
*mp = m;
return (0);
bad:
*mp = m;
return (-1);
}
#ifdef INET6
/*
* Same as above, but for IPv6.
* Cut-and-pasted from ip6_input.c.
* XXX Should we update ip6stat, or not?
*/
static int
bridge_ip6_checkbasic(struct mbuf **mp)
{
struct mbuf *m = *mp;
struct ip6_hdr *ip6;
/*
* If the IPv6 header is not aligned, slurp it up into a new
* mbuf with space for link headers, in the event we forward
* it. Otherwise, if it is aligned, make sure the entire base
* IPv6 header is in the first mbuf of the chain.
*/
if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
struct ifnet *inifp = m->m_pkthdr.rcvif;
if ((m = m_copyup(m, sizeof(struct ip6_hdr),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
ip6stat.ip6s_toosmall++;
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
goto bad;
}
} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
struct ifnet *inifp = m->m_pkthdr.rcvif;
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
ip6stat.ip6s_toosmall++;
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
goto bad;
}
}
ip6 = mtod(m, struct ip6_hdr *);
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
ip6stat.ip6s_badvers++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
/* Checks out, proceed */
*mp = m;
return (0);
bad:
*mp = m;
return (-1);
}
#endif /* INET6 */
/*
* bridge_fragment:
*
* Return a fragmented mbuf chain.
*/
static int
bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh,
int snap, struct llc *llc)
{
struct mbuf *m0;
struct ip *ip;
int error = -1;
if (m->m_len < sizeof(struct ip) &&
(m = m_pullup(m, sizeof(struct ip))) == NULL)
goto out;
ip = mtod(m, struct ip *);
error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist,
CSUM_DELAY_IP);
if (error)
goto out;
/* walk the chain and re-add the Ethernet header */
for (m0 = m; m0; m0 = m0->m_nextpkt) {
if (error == 0) {
if (snap) {
M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT);
if (m0 == NULL) {
error = ENOBUFS;
continue;
}
bcopy(llc, mtod(m0, caddr_t),
sizeof(struct llc));
}
M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT);
if (m0 == NULL) {
error = ENOBUFS;
continue;
}
bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN);
} else
m_freem(m);
}
if (error == 0)
ipstat.ips_fragmented++;
return (error);
out:
if (m != NULL)
m_freem(m);
return (error);
}
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