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NetBSD/sys/net/if_bridge.c

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/* $NetBSD: if_bridge.c,v 1.102 2015/08/28 14:23:18 rjs 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>
__KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.102 2015/08/28 14:23:18 rjs Exp $");
#ifdef _KERNEL_OPT
#include "opt_bridge_ipf.h"
#include "opt_inet.h"
#endif /* _KERNEL_OPT */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h> /* for softnet_lock */
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/pool.h>
#include <sys/kauth.h>
#include <sys/cpu.h>
#include <sys/cprng.h>
#include <sys/mutex.h>
#include <sys/kmem.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_llc.h>
#include <net/pktqueue.h>
#include <net/if_ether.h>
#include <net/if_bridgevar.h>
#if defined(BRIDGE_IPF)
/* Used for bridge_ip[6]_checkbasic */
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_private.h> /* XXX */
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h> /* XXX */
#endif /* BRIDGE_IPF */
/*
* 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)
#include "carp.h"
#if NCARP > 0
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_carp.h>
#endif
#include "ioconf.h"
__CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf));
__CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len));
__CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf));
/*
* 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
#define BRIDGE_RT_INTR_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_intr_lock)
#define BRIDGE_RT_INTR_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_intr_lock)
#define BRIDGE_RT_INTR_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_intr_lock)
#define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \
mutex_enter((_sc)->sc_rtlist_lock)
#define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \
mutex_exit((_sc)->sc_rtlist_lock)
#define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \
mutex_owned((_sc)->sc_rtlist_lock))
#define BRIDGE_RT_PSZ_PERFORM(_sc) \
if ((_sc)->sc_rtlist_psz != NULL) \
pserialize_perform((_sc)->sc_rtlist_psz);
#ifdef BRIDGE_MPSAFE
#define BRIDGE_RT_RENTER(__s) do { \
if (!cpu_intr_p()) \
__s = pserialize_read_enter(); \
else \
__s = splhigh(); \
} while (0)
#define BRIDGE_RT_REXIT(__s) do { \
if (!cpu_intr_p()) \
pserialize_read_exit(__s); \
else \
splx(__s); \
} while (0)
#else /* BRIDGE_MPSAFE */
#define BRIDGE_RT_RENTER(__s) do { __s = 0; } while (0)
#define BRIDGE_RT_REXIT(__s) do { (void)__s; } while (0)
#endif /* BRIDGE_MPSAFE */
int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
static struct pool bridge_rtnode_pool;
static struct work bridge_rtage_wk;
static int bridge_clone_create(struct if_clone *, int);
static int bridge_clone_destroy(struct ifnet *);
static int bridge_ioctl(struct ifnet *, u_long, void *);
static int bridge_init(struct ifnet *);
static void bridge_stop(struct ifnet *, int);
static void bridge_start(struct ifnet *);
static void bridge_input(struct ifnet *, struct mbuf *);
static void bridge_forward(void *);
static void bridge_timer(void *);
static void bridge_broadcast(struct bridge_softc *, struct ifnet *,
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_rtage_work(struct work *, void *);
static void bridge_rtflush(struct bridge_softc *, int);
static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *);
static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp);
static void bridge_rtable_init(struct bridge_softc *);
static void bridge_rtable_fini(struct bridge_softc *);
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_remove(struct bridge_softc *,
struct bridge_rtnode *);
static void bridge_rtnode_destroy(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_release_member(struct bridge_softc *, struct bridge_iflist *);
static void bridge_delete_member(struct bridge_softc *,
struct bridge_iflist *);
static struct bridge_iflist *bridge_try_hold_bif(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 *);
#if defined(BRIDGE_IPF)
static int bridge_ioctl_gfilt(struct bridge_softc *, void *);
static int bridge_ioctl_sfilt(struct bridge_softc *, void *);
static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int);
static int bridge_ip_checkbasic(struct mbuf **mp);
# ifdef INET6
static int bridge_ip6_checkbasic(struct mbuf **mp);
# endif /* INET6 */
#endif /* BRIDGE_IPF */
static void bridge_sysctl_fwdq_setup(struct sysctllog **clog,
struct bridge_softc *sc);
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 */
#define BC_F_XLATEIN 0x08 /* xlate arguments in */
#define BC_F_XLATEOUT 0x10 /* xlate arguments out */
static const struct bridge_control bridge_control_table[] = {
[BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
[BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
[BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT},
[BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
[BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT},
[OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT},
[OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT},
[BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER},
[BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER},
[BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
[BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
[BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
[BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER},
#if defined(BRIDGE_IPF)
[BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT},
[BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER},
#endif /* BRIDGE_IPF */
[BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT},
[BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT},
};
static const int bridge_control_table_size = __arraycount(bridge_control_table);
static LIST_HEAD(, bridge_softc) bridge_list;
static kmutex_t bridge_list_lock;
static struct if_clone bridge_cloner =
IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy);
/*
* bridgeattach:
*
* Pseudo-device attach routine.
*/
void
bridgeattach(int n)
{
pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode),
0, 0, 0, "brtpl", NULL, IPL_NET);
LIST_INIT(&bridge_list);
mutex_init(&bridge_list_lock, MUTEX_DEFAULT, IPL_NET);
if_clone_attach(&bridge_cloner);
}
/*
* 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;
int error, flags;
sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
ifp = &sc->sc_if;
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;
sc->sc_filter_flags = 0;
/* Initialize our routing table. */
bridge_rtable_init(sc);
#ifdef BRIDGE_MPSAFE
flags = WQ_MPSAFE;
#else
flags = 0;
#endif
error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage",
bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, flags);
if (error)
panic("%s: workqueue_create %d\n", __func__, error);
callout_init(&sc->sc_brcallout, 0);
callout_init(&sc->sc_bstpcallout, 0);
LIST_INIT(&sc->sc_iflist);
#ifdef BRIDGE_MPSAFE
sc->sc_iflist_intr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET);
sc->sc_iflist_psz = pserialize_create();
sc->sc_iflist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET);
#else
sc->sc_iflist_intr_lock = NULL;
sc->sc_iflist_psz = NULL;
sc->sc_iflist_lock = NULL;
#endif
cv_init(&sc->sc_iflist_cv, "if_bridge_cv");
if_initname(ifp, ifc->ifc_name, unit);
ifp->if_softc = sc;
ifp->if_mtu = ETHERMTU;
ifp->if_ioctl = bridge_ioctl;
ifp->if_output = bridge_output;
ifp->if_start = bridge_start;
ifp->if_stop = bridge_stop;
ifp->if_init = bridge_init;
ifp->if_type = IFT_BRIDGE;
ifp->if_addrlen = 0;
ifp->if_dlt = DLT_EN10MB;
ifp->if_hdrlen = ETHER_HDR_LEN;
sc->sc_fwd_pktq = pktq_create(IFQ_MAXLEN, bridge_forward, sc);
KASSERT(sc->sc_fwd_pktq != NULL);
bridge_sysctl_fwdq_setup(&ifp->if_sysctl_log, sc);
if_attach(ifp);
if_alloc_sadl(ifp);
mutex_enter(&bridge_list_lock);
LIST_INSERT_HEAD(&bridge_list, sc, sc_list);
mutex_exit(&bridge_list_lock);
return (0);
}
/*
* bridge_clone_destroy:
*
* Destroy a bridge instance.
*/
static int
bridge_clone_destroy(struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_softc;
struct bridge_iflist *bif;
int s;
/* Must be called during IFF_RUNNING, i.e., before bridge_stop */
pktq_barrier(sc->sc_fwd_pktq);
s = splnet();
bridge_stop(ifp, 1);
BRIDGE_LOCK(sc);
while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL)
bridge_delete_member(sc, bif);
BRIDGE_UNLOCK(sc);
mutex_enter(&bridge_list_lock);
LIST_REMOVE(sc, sc_list);
mutex_exit(&bridge_list_lock);
splx(s);
if_detach(ifp);
/* Should be called after if_detach for safe */
pktq_flush(sc->sc_fwd_pktq);
pktq_destroy(sc->sc_fwd_pktq);
/* Tear down the routing table. */
bridge_rtable_fini(sc);
cv_destroy(&sc->sc_iflist_cv);
if (sc->sc_iflist_intr_lock)
mutex_obj_free(sc->sc_iflist_intr_lock);
if (sc->sc_iflist_psz)
pserialize_destroy(sc->sc_iflist_psz);
if (sc->sc_iflist_lock)
mutex_obj_free(sc->sc_iflist_lock);
workqueue_destroy(sc->sc_rtage_wq);
kmem_free(sc, sizeof(*sc));
return (0);
}
static int
bridge_sysctl_fwdq_maxlen(SYSCTLFN_ARGS)
{
struct sysctlnode node = *rnode;
const struct bridge_softc *sc = node.sysctl_data;
return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), sc->sc_fwd_pktq);
}
#define SYSCTL_BRIDGE_PKTQ(cn, c) \
static int \
bridge_sysctl_fwdq_##cn(SYSCTLFN_ARGS) \
{ \
struct sysctlnode node = *rnode; \
const struct bridge_softc *sc = node.sysctl_data; \
return sysctl_pktq_count(SYSCTLFN_CALL(rnode), \
sc->sc_fwd_pktq, c); \
}
SYSCTL_BRIDGE_PKTQ(items, PKTQ_NITEMS)
SYSCTL_BRIDGE_PKTQ(drops, PKTQ_DROPS)
static void
bridge_sysctl_fwdq_setup(struct sysctllog **clog, struct bridge_softc *sc)
{
const struct sysctlnode *cnode, *rnode;
sysctlfn len_func = NULL, maxlen_func = NULL, drops_func = NULL;
const char *ifname = sc->sc_if.if_xname;
len_func = bridge_sysctl_fwdq_items;
maxlen_func = bridge_sysctl_fwdq_maxlen;
drops_func = bridge_sysctl_fwdq_drops;
if (sysctl_createv(clog, 0, NULL, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "interfaces",
SYSCTL_DESCR("Per-interface controls"),
NULL, 0, NULL, 0,
CTL_NET, CTL_CREATE, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, ifname,
SYSCTL_DESCR("Interface controls"),
NULL, 0, NULL, 0,
CTL_CREATE, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &rnode,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "fwdq",
SYSCTL_DESCR("Protocol input queue controls"),
NULL, 0, NULL, 0,
CTL_CREATE, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &cnode,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "len",
SYSCTL_DESCR("Current forwarding queue length"),
len_func, 0, (void *)sc, 0,
CTL_CREATE, IFQCTL_LEN, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &cnode,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxlen",
SYSCTL_DESCR("Maximum allowed forwarding queue length"),
maxlen_func, 0, (void *)sc, 0,
CTL_CREATE, IFQCTL_MAXLEN, CTL_EOL) != 0)
goto bad;
if (sysctl_createv(clog, 0, &rnode, &cnode,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "drops",
SYSCTL_DESCR("Packets dropped due to full forwarding queue"),
drops_func, 0, (void *)sc, 0,
CTL_CREATE, IFQCTL_DROPS, CTL_EOL) != 0)
goto bad;
return;
bad:
aprint_error("%s: could not attach sysctl nodes\n", ifname);
return;
}
/*
* bridge_ioctl:
*
* Handle a control request from the operator.
*/
static int
bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct bridge_softc *sc = ifp->if_softc;
struct lwp *l = curlwp; /* XXX */
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 = NULL; /* XXXGCC */
int s, error = 0;
/* Authorize command before calling splnet(). */
switch (cmd) {
case SIOCGDRVSPEC:
case SIOCSDRVSPEC:
if (ifd->ifd_cmd >= bridge_control_table_size
|| (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) {
error = EINVAL;
return error;
}
/* We only care about BC_F_SUSER at this point. */
if ((bc->bc_flags & BC_F_SUSER) == 0)
break;
error = kauth_authorize_network(l->l_cred,
KAUTH_NETWORK_INTERFACE_BRIDGE,
cmd == SIOCGDRVSPEC ?
KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV :
KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV,
ifd, NULL, NULL);
if (error)
return (error);
break;
}
s = splnet();
switch (cmd) {
case SIOCGDRVSPEC:
case SIOCSDRVSPEC:
KASSERT(bc != NULL);
if (cmd == SIOCGDRVSPEC &&
(bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) {
error = EINVAL;
break;
}
else if (cmd == SIOCSDRVSPEC &&
(bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) {
error = EINVAL;
break;
}
/* BC_F_SUSER is checked above, before splnet(). */
if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0
&& (ifd->ifd_len != bc->bc_argsize
|| ifd->ifd_len > sizeof(args))) {
error = EINVAL;
break;
}
memset(&args, 0, sizeof(args));
if (bc->bc_flags & BC_F_COPYIN) {
error = copyin(ifd->ifd_data, &args, ifd->ifd_len);
if (error)
break;
} else if (bc->bc_flags & BC_F_XLATEIN) {
args.ifbifconf.ifbic_len = ifd->ifd_len;
args.ifbifconf.ifbic_buf = ifd->ifd_data;
}
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);
} else if (bc->bc_flags & BC_F_XLATEOUT) {
ifd->ifd_len = args.ifbifconf.ifbic_len;
ifd->ifd_data = args.ifbifconf.ifbic_buf;
}
break;
case SIOCSIFFLAGS:
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
break;
switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
case IFF_RUNNING:
/*
* If interface is marked down and it is running,
* then stop and disable it.
*/
(*ifp->if_stop)(ifp, 1);
break;
case IFF_UP:
/*
* If interface is marked up and it is stopped, then
* start it.
*/
error = (*ifp->if_init)(ifp);
break;
default:
break;
}
break;
case SIOCSIFMTU:
if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
error = 0;
break;
default:
error = ifioctl_common(ifp, cmd, data);
break;
}
splx(s);
return (error);
}
/*
* 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;
int s;
BRIDGE_PSZ_RENTER(s);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
ifp = bif->bif_ifp;
if (strcmp(ifp->if_xname, name) == 0)
break;
}
bif = bridge_try_hold_bif(bif);
BRIDGE_PSZ_REXIT(s);
return bif;
}
/*
* 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;
int s;
BRIDGE_PSZ_RENTER(s);
bif = member_ifp->if_bridgeif;
bif = bridge_try_hold_bif(bif);
BRIDGE_PSZ_REXIT(s);
return bif;
}
static struct bridge_iflist *
bridge_try_hold_bif(struct bridge_iflist *bif)
{
#ifdef BRIDGE_MPSAFE
if (bif != NULL) {
if (bif->bif_waiting)
bif = NULL;
else
atomic_inc_32(&bif->bif_refs);
}
#endif
return bif;
}
/*
* bridge_release_member:
*
* Release the specified member interface.
*/
static void
bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif)
{
#ifdef BRIDGE_MPSAFE
uint32_t refs;
refs = atomic_dec_uint_nv(&bif->bif_refs);
if (__predict_false(refs == 0 && bif->bif_waiting)) {
BRIDGE_INTR_LOCK(sc);
cv_broadcast(&sc->sc_iflist_cv);
BRIDGE_INTR_UNLOCK(sc);
}
#else
(void)sc;
(void)bif;
#endif
}
/*
* bridge_delete_member:
*
* Delete the specified member interface.
*/
static void
bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif)
{
struct ifnet *ifs = bif->bif_ifp;
KASSERT(BRIDGE_LOCKED(sc));
ifs->if_input = ether_input;
ifs->if_bridge = NULL;
ifs->if_bridgeif = NULL;
LIST_REMOVE(bif, bif_next);
BRIDGE_PSZ_PERFORM(sc);
BRIDGE_UNLOCK(sc);
#ifdef BRIDGE_MPSAFE
BRIDGE_INTR_LOCK(sc);
bif->bif_waiting = true;
membar_sync();
while (bif->bif_refs > 0) {
aprint_debug("%s: cv_wait on iflist\n", __func__);
cv_wait(&sc->sc_iflist_cv, sc->sc_iflist_intr_lock);
}
bif->bif_waiting = false;
BRIDGE_INTR_UNLOCK(sc);
#endif
kmem_free(bif, sizeof(*bif));
BRIDGE_LOCK(sc);
}
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;
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
if (sc->sc_if.if_mtu != ifs->if_mtu)
return (EINVAL);
if (ifs->if_bridge == sc)
return (EEXIST);
if (ifs->if_bridge != NULL)
return (EBUSY);
if (ifs->if_input != ether_input)
return EINVAL;
/* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */
if ((ifs->if_flags & IFF_SIMPLEX) == 0)
return EINVAL;
bif = kmem_alloc(sizeof(*bif), KM_SLEEP);
switch (ifs->if_type) {
case IFT_ETHER:
/*
* Place the interface into promiscuous mode.
*/
error = ifpromisc(ifs, 1);
if (error)
goto out;
break;
default:
error = EINVAL;
goto out;
}
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;
bif->bif_refs = 0;
bif->bif_waiting = false;
BRIDGE_LOCK(sc);
ifs->if_bridge = sc;
ifs->if_bridgeif = bif;
LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
ifs->if_input = bridge_input;
BRIDGE_UNLOCK(sc);
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
else
bstp_stop(sc);
out:
if (error) {
if (bif != NULL)
kmem_free(bif, sizeof(*bif));
}
return (error);
}
static int
bridge_ioctl_del(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
const char *name = req->ifbr_ifsname;
struct bridge_iflist *bif;
struct ifnet *ifs;
BRIDGE_LOCK(sc);
/*
* Don't use bridge_lookup_member. We want to get a member
* with bif_refs == 0.
*/
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
ifs = bif->bif_ifp;
if (strcmp(ifs->if_xname, name) == 0)
break;
}
if (bif == NULL) {
BRIDGE_UNLOCK(sc);
return ENOENT;
}
bridge_delete_member(sc, bif);
BRIDGE_UNLOCK(sc);
switch (ifs->if_type) {
case IFT_ETHER:
/*
* Take the interface out of promiscuous mode.
* Don't call it with holding a spin lock.
*/
(void) ifpromisc(ifs, 0);
break;
default:
#ifdef DIAGNOSTIC
panic("bridge_delete_member: impossible");
#endif
break;
}
bridge_rtdelete(sc, ifs);
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
return 0;
}
static int
bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
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;
bridge_release_member(sc, bif);
return (0);
}
static int
bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
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. */
bridge_release_member(sc, bif);
return (EINVAL);
}
}
bif->bif_flags = req->ifbr_ifsflags;
bridge_release_member(sc, bif);
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_scache(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
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;
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 *breqs;
int i, count, error = 0;
retry:
BRIDGE_LOCK(sc);
count = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
count++;
BRIDGE_UNLOCK(sc);
if (count == 0) {
bifc->ifbic_len = 0;
return 0;
}
if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) {
/* Tell that a larger buffer is needed */
bifc->ifbic_len = sizeof(*breqs) * count;
return 0;
}
breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP);
BRIDGE_LOCK(sc);
i = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
i++;
if (i > count) {
/*
* The number of members has been increased.
* We need more memory!
*/
BRIDGE_UNLOCK(sc);
kmem_free(breqs, sizeof(*breqs) * count);
goto retry;
}
i = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
struct ifbreq *breq = &breqs[i++];
memset(breq, 0, sizeof(*breq));
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;
}
/* Don't call copyout with holding the mutex */
BRIDGE_UNLOCK(sc);
for (i = 0; i < count; i++) {
error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs));
if (error)
break;
}
bifc->ifbic_len = sizeof(*breqs) * i;
kmem_free(breqs, sizeof(*breqs) * 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;
if (bac->ifbac_len == 0)
return (0);
BRIDGE_RT_INTR_LOCK(sc);
len = bac->ifbac_len;
LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
if (len < sizeof(bareq))
goto out;
memset(&bareq, 0, sizeof(bareq));
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) {
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:
BRIDGE_RT_INTR_UNLOCK(sc);
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;
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);
bridge_release_member(sc, bif);
return (error);
}
static int
bridge_ioctl_sto(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
sc->sc_brttimeout = param->ifbrp_ctime;
return (0);
}
static int
bridge_ioctl_gto(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
param->ifbrp_ctime = sc->sc_brttimeout;
return (0);
}
static int
bridge_ioctl_daddr(struct bridge_softc *sc, void *arg)
{
struct ifbareq *req = arg;
return (bridge_rtdaddr(sc, req->ifba_dst));
}
static int
bridge_ioctl_flush(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
bridge_rtflush(sc, req->ifbr_ifsflags);
return (0);
}
static int
bridge_ioctl_gpri(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
param->ifbrp_prio = sc->sc_bridge_priority;
return (0);
}
static int
bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
sc->sc_bridge_priority = param->ifbrp_prio;
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
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;
if (param->ifbrp_hellotime == 0)
return (EINVAL);
sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8;
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
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;
if (param->ifbrp_fwddelay == 0)
return (EINVAL);
sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8;
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
return (0);
}
static int
bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
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;
if (param->ifbrp_maxage == 0)
return (EINVAL);
sc->sc_bridge_max_age = param->ifbrp_maxage << 8;
if (sc->sc_if.if_flags & IFF_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;
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bif->bif_priority = req->ifbr_priority;
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
bridge_release_member(sc, bif);
return (0);
}
#if defined(BRIDGE_IPF)
static int
bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
param->ifbrp_filter = sc->sc_filter_flags;
return (0);
}
static int
bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
uint32_t nflags, oflags;
if (param->ifbrp_filter & ~IFBF_FILT_MASK)
return (EINVAL);
nflags = param->ifbrp_filter;
oflags = sc->sc_filter_flags;
if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) {
pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT,
sc->sc_if.if_pfil);
}
if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) {
pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT,
sc->sc_if.if_pfil);
}
sc->sc_filter_flags = nflags;
return (0);
}
#endif /* BRIDGE_IPF */
static int
bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bif->bif_path_cost = req->ifbr_path_cost;
if (sc->sc_if.if_flags & IFF_RUNNING)
bstp_initialization(sc);
bridge_release_member(sc, bif);
return (0);
}
/*
* bridge_ifdetach:
*
* Detach an interface from a bridge. Called when a member
* interface is detaching.
*/
void
bridge_ifdetach(struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_bridge;
struct ifbreq breq;
/* ioctl_lock should prevent this from happening */
KASSERT(sc != NULL);
memset(&breq, 0, sizeof(breq));
strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname));
(void) bridge_ioctl_del(sc, &breq);
}
/*
* bridge_init:
*
* Initialize a bridge interface.
*/
static int
bridge_init(struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_softc;
if (ifp->if_flags & IFF_RUNNING)
return (0);
callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz,
bridge_timer, sc);
ifp->if_flags |= IFF_RUNNING;
bstp_initialization(sc);
return (0);
}
/*
* bridge_stop:
*
* Stop the bridge interface.
*/
static void
bridge_stop(struct ifnet *ifp, int disable)
{
struct bridge_softc *sc = ifp->if_softc;
if ((ifp->if_flags & IFF_RUNNING) == 0)
return;
callout_stop(&sc->sc_brcallout);
bstp_stop(sc);
bridge_rtflush(sc, IFBF_FLUSHDYN);
ifp->if_flags &= ~IFF_RUNNING;
}
/*
* bridge_enqueue:
*
* Enqueue a packet on a bridge member interface.
*/
void
bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m,
int runfilt)
{
ALTQ_DECL(struct altq_pktattr pktattr;)
int len, error;
short mflags;
/*
* Clear any in-bound checksum flags for this packet.
*/
m->m_pkthdr.csum_flags = 0;
if (runfilt) {
if (pfil_run_hooks(sc->sc_if.if_pfil, &m,
dst_ifp, PFIL_OUT) != 0) {
if (m != NULL)
m_freem(m);
return;
}
if (m == NULL)
return;
}
#ifdef ALTQ
/*
* If ALTQ is enabled on the member interface, do
* classification; the queueing discipline might
* not require classification, but might require
* the address family/header pointer in the pktattr.
*/
if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) {
/* XXX IFT_ETHER */
altq_etherclassify(&dst_ifp->if_snd, m, &pktattr);
}
#endif /* ALTQ */
len = m->m_pkthdr.len;
mflags = m->m_flags;
IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error);
if (error) {
/* mbuf is already freed */
sc->sc_if.if_oerrors++;
return;
}
sc->sc_if.if_opackets++;
sc->sc_if.if_obytes += len;
dst_ifp->if_obytes += len;
if (mflags & M_MCAST) {
sc->sc_if.if_omcasts++;
dst_ifp->if_omcasts++;
}
if ((dst_ifp->if_flags & IFF_OACTIVE) == 0)
(*dst_ifp->if_start)(dst_ifp);
}
/*
* 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.
*/
int
bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
struct rtentry *rt)
{
struct ether_header *eh;
struct ifnet *dst_if;
struct bridge_softc *sc;
#ifndef BRIDGE_MPSAFE
int s;
#endif
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;
#ifndef BRIDGE_MPSAFE
s = splnet();
#endif
/*
* 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 (__predict_false(sc == NULL) ||
(sc->sc_if.if_flags & IFF_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 used = 0;
int ss;
BRIDGE_PSZ_RENTER(ss);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
bif = bridge_try_hold_bif(bif);
if (bif == NULL)
continue;
BRIDGE_PSZ_REXIT(ss);
dst_if = bif->bif_ifp;
if ((dst_if->if_flags & IFF_RUNNING) == 0)
goto next;
/*
* 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:
goto next;
}
}
if (LIST_NEXT(bif, bif_next) == NULL) {
used = 1;
mc = m;
} else {
mc = m_copym(m, 0, M_COPYALL, M_NOWAIT);
if (mc == NULL) {
sc->sc_if.if_oerrors++;
goto next;
}
}
bridge_enqueue(sc, dst_if, mc, 0);
next:
bridge_release_member(sc, bif);
BRIDGE_PSZ_RENTER(ss);
}
BRIDGE_PSZ_REXIT(ss);
if (used == 0)
m_freem(m);
#ifndef BRIDGE_MPSAFE
splx(s);
#endif
return (0);
}
sendunicast:
/*
* XXX Spanning tree consideration here?
*/
if ((dst_if->if_flags & IFF_RUNNING) == 0) {
m_freem(m);
#ifndef BRIDGE_MPSAFE
splx(s);
#endif
return (0);
}
bridge_enqueue(sc, dst_if, m, 0);
#ifndef BRIDGE_MPSAFE
splx(s);
#endif
return (0);
}
/*
* bridge_start:
*
* Start output on a bridge.
*
* NOTE: This routine should never be called in this implementation.
*/
static void
bridge_start(struct ifnet *ifp)
{
printf("%s: bridge_start() called\n", ifp->if_xname);
}
/*
* bridge_forward:
*
* The forwarding function of the bridge.
*/
static void
bridge_forward(void *v)
{
struct bridge_softc *sc = v;
struct mbuf *m;
struct bridge_iflist *bif;
struct ifnet *src_if, *dst_if;
struct ether_header *eh;
#ifndef BRIDGE_MPSAFE
int s;
KERNEL_LOCK(1, NULL);
mutex_enter(softnet_lock);
#endif
if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) {
#ifndef BRIDGE_MPSAFE
mutex_exit(softnet_lock);
KERNEL_UNLOCK_ONE(NULL);
#endif
return;
}
#ifndef BRIDGE_MPSAFE
s = splnet();
#endif
while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) {
src_if = m->m_pkthdr.rcvif;
sc->sc_if.if_ipackets++;
sc->sc_if.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?) */
m_freem(m);
continue;
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
m_freem(m);
bridge_release_member(sc, bif);
continue;
}
}
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_release_member(sc, bif);
continue;
}
bridge_release_member(sc, bif);
/*
* 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) {
m_freem(m);
continue;
}
} else {
/* ...forward it to all interfaces. */
sc->sc_if.if_imcasts++;
dst_if = NULL;
}
if (pfil_run_hooks(sc->sc_if.if_pfil, &m,
m->m_pkthdr.rcvif, PFIL_IN) != 0) {
if (m != NULL)
m_freem(m);
continue;
}
if (m == NULL)
continue;
if (dst_if == NULL) {
bridge_broadcast(sc, src_if, m);
continue;
}
/*
* At this point, we're dealing with a unicast frame
* going to a different interface.
*/
if ((dst_if->if_flags & IFF_RUNNING) == 0) {
m_freem(m);
continue;
}
bif = bridge_lookup_member_if(sc, dst_if);
if (bif == NULL) {
/* Not a member of the bridge (anymore?) */
m_freem(m);
continue;
}
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_DISABLED:
case BSTP_IFSTATE_BLOCKING:
m_freem(m);
bridge_release_member(sc, bif);
continue;
}
}
bridge_release_member(sc, bif);
bridge_enqueue(sc, dst_if, m, 1);
}
#ifndef BRIDGE_MPSAFE
splx(s);
mutex_exit(softnet_lock);
KERNEL_UNLOCK_ONE(NULL);
#endif
}
static bool
bstp_state_before_learning(struct bridge_iflist *bif)
{
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_LISTENING:
case BSTP_IFSTATE_DISABLED:
return true;
}
}
return false;
}
static bool
bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src)
{
uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost;
if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0
#if NCARP > 0
|| (bif->bif_ifp->if_carp &&
carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL)
#endif /* NCARP > 0 */
)
return true;
return false;
}
/*
* bridge_input:
*
* Receive input from a member interface. Queue the packet for
* bridging if it is not for us.
*/
static void
bridge_input(struct ifnet *ifp, struct mbuf *m)
{
struct bridge_softc *sc = ifp->if_bridge;
struct bridge_iflist *bif;
struct ether_header *eh;
if (__predict_false(sc == NULL) ||
(sc->sc_if.if_flags & IFF_RUNNING) == 0) {
ether_input(ifp, m);
return;
}
bif = bridge_lookup_member_if(sc, ifp);
if (bif == NULL) {
ether_input(ifp, m);
return;
}
eh = mtod(m, struct ether_header *);
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
if (memcmp(etherbroadcastaddr,
eh->ether_dhost, ETHER_ADDR_LEN) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
}
/*
* A 'fast' path for packets addressed to interfaces that are
* part of this bridge.
*/
if (!(m->m_flags & (M_BCAST|M_MCAST)) &&
!bstp_state_before_learning(bif)) {
struct bridge_iflist *_bif;
struct ifnet *_ifp = NULL;
int s;
BRIDGE_PSZ_RENTER(s);
LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) {
/* It is destined for us. */
if (bridge_ourether(_bif, eh, 0)) {
_bif = bridge_try_hold_bif(_bif);
BRIDGE_PSZ_REXIT(s);
if (_bif == NULL)
goto out;
if (_bif->bif_flags & IFBIF_LEARNING)
(void) bridge_rtupdate(sc,
eh->ether_shost, ifp, 0, IFBAF_DYNAMIC);
_ifp = m->m_pkthdr.rcvif = _bif->bif_ifp;
bridge_release_member(sc, _bif);
goto out;
}
/* We just received a packet that we sent out. */
if (bridge_ourether(_bif, eh, 1))
break;
}
BRIDGE_PSZ_REXIT(s);
out:
if (_bif != NULL) {
bridge_release_member(sc, bif);
if (_ifp != NULL) {
m->m_flags &= ~M_PROMISC;
ether_input(_ifp, m);
} else
m_freem(m);
return;
}
}
/* Tap off 802.1D packets; they do not get forwarded. */
if (bif->bif_flags & IFBIF_STP &&
memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) {
bstp_input(sc, bif, m);
bridge_release_member(sc, bif);
return;
}
/*
* A normal switch would discard the packet here, but that's not what
* we've done historically. This also prevents some obnoxious behaviour.
*/
if (bstp_state_before_learning(bif)) {
bridge_release_member(sc, bif);
ether_input(ifp, m);
return;
}
bridge_release_member(sc, bif);
/* Queue the packet for bridge forwarding. */
if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0)))
m_freem(m);
}
/*
* bridge_broadcast:
*
* Send a frame to all interfaces that are members of
* the bridge, except for the one on which the packet
* arrived.
*/
static void
bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if,
struct mbuf *m)
{
struct bridge_iflist *bif;
struct mbuf *mc;
struct ifnet *dst_if;
bool bmcast;
int s;
bmcast = m->m_flags & (M_BCAST|M_MCAST);
BRIDGE_PSZ_RENTER(s);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
bif = bridge_try_hold_bif(bif);
if (bif == NULL)
continue;
BRIDGE_PSZ_REXIT(s);
dst_if = bif->bif_ifp;
if (bif->bif_flags & IFBIF_STP) {
switch (bif->bif_state) {
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_DISABLED:
goto next;
}
}
if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast)
goto next;
if ((dst_if->if_flags & IFF_RUNNING) == 0)
goto next;
if (dst_if != src_if) {
mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
if (mc == NULL) {
sc->sc_if.if_oerrors++;
goto next;
}
bridge_enqueue(sc, dst_if, mc, 1);
}
if (bmcast) {
mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
if (mc == NULL) {
sc->sc_if.if_oerrors++;
goto next;
}
mc->m_pkthdr.rcvif = dst_if;
mc->m_flags &= ~M_PROMISC;
ether_input(dst_if, mc);
}
next:
bridge_release_member(sc, bif);
BRIDGE_PSZ_RENTER(s);
}
BRIDGE_PSZ_REXIT(s);
m_freem(m);
}
static int
bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst,
struct bridge_rtnode **brtp)
{
struct bridge_rtnode *brt;
int error;
if (sc->sc_brtcnt >= sc->sc_brtmax)
return ENOSPC;
/*
* Allocate a new bridge forwarding node, and
* initialize the expiration time and Ethernet
* address.
*/
brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT);
if (brt == NULL)
return ENOMEM;
memset(brt, 0, sizeof(*brt));
brt->brt_expire = time_uptime + sc->sc_brttimeout;
brt->brt_flags = IFBAF_DYNAMIC;
memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
BRIDGE_RT_INTR_LOCK(sc);
error = bridge_rtnode_insert(sc, brt);
BRIDGE_RT_INTR_UNLOCK(sc);
if (error != 0) {
pool_put(&bridge_rtnode_pool, brt);
return error;
}
*brtp = brt;
return 0;
}
/*
* 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 s;
again:
/*
* A route for this destination might already exist. If so,
* update it, otherwise create a new one.
*/
BRIDGE_RT_RENTER(s);
brt = bridge_rtnode_lookup(sc, dst);
if (brt != NULL) {
brt->brt_ifp = dst_if;
if (setflags) {
brt->brt_flags = flags;
if (flags & IFBAF_STATIC)
brt->brt_expire = 0;
else
brt->brt_expire = time_uptime + sc->sc_brttimeout;
} else {
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
brt->brt_expire = time_uptime + sc->sc_brttimeout;
}
}
BRIDGE_RT_REXIT(s);
if (brt == NULL) {
int r;
r = bridge_rtalloc(sc, dst, &brt);
if (r != 0)
return r;
goto again;
}
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;
struct ifnet *ifs = NULL;
int s;
BRIDGE_RT_RENTER(s);
brt = bridge_rtnode_lookup(sc, addr);
if (brt != NULL)
ifs = brt->brt_ifp;
BRIDGE_RT_REXIT(s);
return ifs;
}
typedef bool (*bridge_iterate_cb_t)
(struct bridge_softc *, struct bridge_rtnode *, bool *, void *);
/*
* bridge_rtlist_iterate_remove:
*
* It iterates on sc->sc_rtlist and removes rtnodes of it which func
* callback judges to remove. Removals of rtnodes are done in a manner
* of pserialize. To this end, all kmem_* operations are placed out of
* mutexes.
*/
static void
bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg)
{
struct bridge_rtnode *brt, *nbrt;
struct bridge_rtnode **brt_list;
int i, count;
retry:
count = sc->sc_brtcnt;
if (count == 0)
return;
brt_list = kmem_alloc(sizeof(struct bridge_rtnode *) * count, KM_SLEEP);
BRIDGE_RT_LOCK(sc);
BRIDGE_RT_INTR_LOCK(sc);
if (__predict_false(sc->sc_brtcnt > count)) {
/* The rtnodes increased, we need more memory */
BRIDGE_RT_INTR_UNLOCK(sc);
BRIDGE_RT_UNLOCK(sc);
kmem_free(brt_list, sizeof(*brt_list) * count);
goto retry;
}
i = 0;
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
bool need_break = false;
if (func(sc, brt, &need_break, arg)) {
bridge_rtnode_remove(sc, brt);
brt_list[i++] = brt;
}
if (need_break)
break;
}
BRIDGE_RT_INTR_UNLOCK(sc);
if (i > 0)
BRIDGE_RT_PSZ_PERFORM(sc);
BRIDGE_RT_UNLOCK(sc);
while (--i >= 0)
bridge_rtnode_destroy(brt_list[i]);
kmem_free(brt_list, sizeof(*brt_list) * count);
}
static bool
bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt,
bool *need_break, void *arg)
{
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) {
/* Take into account of the subsequent removal */
if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax)
*need_break = true;
return true;
} else
return false;
}
static void
bridge_rttrim0(struct bridge_softc *sc)
{
bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL);
}
/*
* 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)
{
/* 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;
bridge_rttrim0(sc);
return;
}
/*
* bridge_timer:
*
* Aging timer for the bridge.
*/
static void
bridge_timer(void *arg)
{
struct bridge_softc *sc = arg;
workqueue_enqueue(sc->sc_rtage_wq, &bridge_rtage_wk, NULL);
}
static void
bridge_rtage_work(struct work *wk, void *arg)
{
struct bridge_softc *sc = arg;
KASSERT(wk == &bridge_rtage_wk);
bridge_rtage(sc);
if (sc->sc_if.if_flags & IFF_RUNNING)
callout_reset(&sc->sc_brcallout,
bridge_rtable_prune_period * hz, bridge_timer, sc);
}
static bool
bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt,
bool *need_break, void *arg)
{
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
time_uptime >= brt->brt_expire)
return true;
else
return false;
}
/*
* bridge_rtage:
*
* Perform an aging cycle.
*/
static void
bridge_rtage(struct bridge_softc *sc)
{
bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL);
}
static bool
bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt,
bool *need_break, void *arg)
{
int full = *(int*)arg;
if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
return true;
else
return false;
}
/*
* bridge_rtflush:
*
* Remove all dynamic addresses from the bridge.
*/
static void
bridge_rtflush(struct bridge_softc *sc, int full)
{
bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full);
}
/*
* 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_RT_LOCK(sc);
BRIDGE_RT_INTR_LOCK(sc);
if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) {
BRIDGE_RT_INTR_UNLOCK(sc);
BRIDGE_RT_UNLOCK(sc);
return ENOENT;
}
bridge_rtnode_remove(sc, brt);
BRIDGE_RT_INTR_UNLOCK(sc);
BRIDGE_RT_PSZ_PERFORM(sc);
BRIDGE_RT_UNLOCK(sc);
bridge_rtnode_destroy(brt);
return 0;
}
/*
* bridge_rtdelete:
*
* Delete routes to a speicifc member interface.
*/
static void
bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_RT_LOCK(sc);
BRIDGE_RT_INTR_LOCK(sc);
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
if (brt->brt_ifp == ifp)
break;
}
if (brt == NULL) {
BRIDGE_RT_INTR_UNLOCK(sc);
BRIDGE_RT_UNLOCK(sc);
return;
}
bridge_rtnode_remove(sc, brt);
BRIDGE_RT_INTR_UNLOCK(sc);
BRIDGE_RT_PSZ_PERFORM(sc);
BRIDGE_RT_UNLOCK(sc);
bridge_rtnode_destroy(brt);
}
/*
* bridge_rtable_init:
*
* Initialize the route table for this bridge.
*/
static void
bridge_rtable_init(struct bridge_softc *sc)
{
int i;
sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
KM_SLEEP);
for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
LIST_INIT(&sc->sc_rthash[i]);
sc->sc_rthash_key = cprng_fast32();
LIST_INIT(&sc->sc_rtlist);
sc->sc_rtlist_intr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET);
#ifdef BRIDGE_MPSAFE
sc->sc_rtlist_psz = pserialize_create();
sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET);
#else
sc->sc_rtlist_psz = NULL;
sc->sc_rtlist_lock = NULL;
#endif
}
/*
* bridge_rtable_fini:
*
* Deconstruct the route table for this bridge.
*/
static void
bridge_rtable_fini(struct bridge_softc *sc)
{
kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE);
if (sc->sc_rtlist_intr_lock)
mutex_obj_free(sc->sc_rtlist_intr_lock);
if (sc->sc_rtlist_lock)
mutex_obj_free(sc->sc_rtlist_lock);
if (sc->sc_rtlist_psz)
pserialize_destroy(sc->sc_rtlist_psz);
}
/*
* 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
/*
* 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;
hash = bridge_rthash(sc, addr);
LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) {
dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN);
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;
KASSERT(BRIDGE_RT_INTR_LOCKED(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 = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN);
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_remove:
*
* Remove a bridge rtnode from the rthash and the rtlist of a bridge.
*/
static void
bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt)
{
KASSERT(BRIDGE_RT_INTR_LOCKED(sc));
LIST_REMOVE(brt, brt_hash);
LIST_REMOVE(brt, brt_list);
sc->sc_brtcnt--;
}
/*
* bridge_rtnode_destroy:
*
* Destroy a bridge rtnode.
*/
static void
bridge_rtnode_destroy(struct bridge_rtnode *brt)
{
pool_put(&bridge_rtnode_pool, brt);
}
#if defined(BRIDGE_IPF)
extern pfil_head_t *inet_pfil_hook; /* XXX */
extern pfil_head_t *inet6_pfil_hook; /* XXX */
/*
* Send bridge packets through IPF if they are one of the types IPF can deal
* with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without
* question.)
*/
static int
bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
int snap, error;
struct ether_header *eh1, eh2;
struct llc llc1;
uint16_t ether_type;
snap = 0;
error = -1; /* Default error if not error == 0 */
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 IPF 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:
goto bad;
}
/* Strip off the Ethernet header and keep a copy. */
m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2);
m_adj(*mp, ETHER_HDR_LEN);
/* Strip off snap header, if present */
if (snap) {
m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1);
m_adj(*mp, sizeof(struct llc));
}
/*
* Check basic packet sanity and run IPF through pfil.
*/
KASSERT(!cpu_intr_p());
switch (ether_type)
{
case ETHERTYPE_IP :
error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0;
if (error == 0)
error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir);
break;
# ifdef INET6
case ETHERTYPE_IPV6 :
error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0;
if (error == 0)
error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir);
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, void *), sizeof(struct llc));
}
M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT);
if (*mp == NULL)
return error;
bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN);
return 0;
bad:
m_freem(*mp);
*mp = NULL;
return error;
}
/*
* Perform basic checks on header size since
* IPF 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;
if (*mp == NULL)
return -1;
if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
if ((m = m_copyup(m, sizeof(struct ip),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
ip_statinc(IP_STAT_TOOSMALL);
goto bad;
}
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
ip_statinc(IP_STAT_TOOSMALL);
goto bad;
}
}
ip = mtod(m, struct ip *);
if (ip == NULL) goto bad;
if (ip->ip_v != IPVERSION) {
ip_statinc(IP_STAT_BADVERS);
goto bad;
}
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) { /* minimum header length */
ip_statinc(IP_STAT_BADHLEN);
goto bad;
}
if (hlen > m->m_len) {
if ((m = m_pullup(m, hlen)) == 0) {
ip_statinc(IP_STAT_BADHLEN);
goto bad;
}
ip = mtod(m, struct ip *);
if (ip == NULL) goto bad;
}
switch (m->m_pkthdr.csum_flags &
((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
M_CSUM_IPv4_BAD)) {
case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
/* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */
goto bad;
case M_CSUM_IPv4:
/* Checksum was okay. */
/* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */
break;
default:
/* Must compute it ourselves. */
/* INET_CSUM_COUNTER_INCR(&ip_swcsum); */
if (in_cksum(m, hlen) != 0)
goto bad;
break;
}
/* Retrieve the packet length. */
len = ntohs(ip->ip_len);
/*
* Check for additional length bogosity
*/
if (len < hlen) {
ip_statinc(IP_STAT_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) {
ip_statinc(IP_STAT_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, void *)) == 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 */
ip6_statinc(IP6_STAT_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) {
ip6_statinc(IP6_STAT_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) {
ip6_statinc(IP6_STAT_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 */
#endif /* BRIDGE_IPF */
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