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6f75ef188b
freebsd-skq/sys/net/if_bridge.c
Christian S.J. Peron 6f75ef188b Slightly re-worked bpf(4) code associated with bridging: if we have a 
destination interface as 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 with the bpf(4) because it will
be re-injected 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 very difficult to debug firewall issues on the
bridge.

Further, implemented IFF_MONITOR for bridge interfaces. This does much the same
thing that it does for regular network interfaces: it pushes the packet to any
bpf(4) peers and then returns. This bypasses all of the bridge machinery,
saving mutex acquisitions, list traversals, and other operations performed by
the bridging code.

This change to the bridging code is useful in situations where individuals use a
bridge to multiplex RX/TX signals from two interfaces, as is required by some
network taps for de-multiplexing links and transmitting the RX/TX signals
out through two separate interfaces. This behaviour is quite common for network
taps monitoring links, especially for certain manufacturers.

Reviewed by:	thompsa
MFC after:	1 month
Sponsored by:	Seccuris Labs
2006-03-03 05:58:18 +00:00

2955 lines
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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 <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
#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 */
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;
struct ifnet *ifp;
u_char eaddr[6];
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 and use the private AC:DE:48
* OUI code.
*/
arc4rand(eaddr, ETHER_ADDR_LEN, 1);
eaddr[0] = 0xAC;
eaddr[1] = 0xDE;
eaddr[2] = 0x48;
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_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);
return;
}
/*
* 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;
short mflags;
len = m->m_pkthdr.len;
mflags = m->m_flags;
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;
return;
}
/*
* 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.
*/
/* XXX Do we tap the packet for the member interface too?
* BPF_MTAP(&m->m_pkthdr.rcvif, m);
*/
/* 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) {
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) {
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;
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_copypacket(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 (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;
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 */
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);
/* Restore ip and the fields ntohs()'d. */
if (*mp != NULL && error == 0) {
ip = mtod(*mp, struct ip *);
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
}
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 */
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