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freebsd-skq/sys/net/if_bridge.c
kevans 48fe76d737 if_bridge(4): Complete bpf auditing of local traffic over the bridge 
There were two remaining "gaps" in auditing local bridge traffic with
bpf(4):

Locally originated outbound traffic from a member interface is invisible to
the bridge's bpf(4) interface. Inbound traffic locally destined to a member
interface is invisible to the member's bpf(4) interface -- this traffic has
no chance after bridge_input to otherwise pass it over, and it wasn't
originally received on this interface.

I call these "gaps" because they don't affect conventional bridge setups.
Alas, being able to establish an audit trail of all locally destined traffic
for setups that can function like this is useful in some scenarios.

Reviewed by:	kp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D19757
2019-05-29 01:08:30 +00:00

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/* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */
/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* 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.
*
* 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 (maybe consider
* heterogeneous bridges).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/protosw.h>
#include <sys/systm.h>
#include <sys/jail.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/syslog.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
#include <sys/module.h>
#include <sys/priv.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 <net/vnet.h>
#include <netinet/in.h>
#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>
#include <netinet6/in6_ifattach.h>
#endif
#if defined(INET) || defined(INET6)
#include <netinet/ip_carp.h>
#endif
#include <machine/in_cksum.h>
#include <netinet/if_ether.h>
#include <net/bridgestp.h>
#include <net/if_bridgevar.h>
#include <net/if_llc.h>
#include <net/if_vlan_var.h>
#include <net/route.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)
/*
* Default maximum number of addresses to cache.
*/
#ifndef BRIDGE_RTABLE_MAX
#define BRIDGE_RTABLE_MAX 2000
#endif
/*
* 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 possibly mask on the member interface.
*/
#define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\
IFCAP_TXCSUM_IPV6)
/*
* List of capabilities to strip
*/
#define BRIDGE_IFCAPS_STRIP IFCAP_LRO
/*
* Bridge interface list entry.
*/
struct bridge_iflist {
LIST_ENTRY(bridge_iflist) bif_next;
struct ifnet *bif_ifp; /* member if */
struct bstp_port bif_stp; /* STP state */
uint32_t bif_flags; /* member if flags */
int bif_savedcaps; /* saved capabilities */
uint32_t bif_addrmax; /* max # of addresses */
uint32_t bif_addrcnt; /* cur. # of addresses */
uint32_t bif_addrexceeded;/* # of address violations */
};
/*
* Bridge route node.
*/
struct bridge_rtnode {
LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */
LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */
struct bridge_iflist *brt_dst; /* destination if */
unsigned long brt_expire; /* expiration time */
uint8_t brt_flags; /* address flags */
uint8_t brt_addr[ETHER_ADDR_LEN];
uint16_t brt_vlan; /* vlan id */
};
#define brt_ifp brt_dst->bif_ifp
/*
* Software state for each bridge.
*/
struct bridge_softc {
struct ifnet *sc_ifp; /* make this an interface */
LIST_ENTRY(bridge_softc) sc_list;
struct mtx sc_mtx;
struct cv sc_cv;
uint32_t sc_brtmax; /* max # of addresses */
uint32_t sc_brtcnt; /* cur. # of addresses */
uint32_t sc_brttimeout; /* rt timeout in seconds */
struct callout sc_brcallout; /* bridge callout */
uint32_t sc_iflist_ref; /* refcount for sc_iflist */
uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */
LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */
LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */
LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */
uint32_t sc_rthash_key; /* key for hash */
LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */
struct bstp_state sc_stp; /* STP state */
uint32_t sc_brtexceeded; /* # of cache drops */
struct ifnet *sc_ifaddr; /* member mac copied from */
struct ether_addr sc_defaddr; /* Default MAC address */
};
VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx);
#define V_bridge_list_mtx VNET(bridge_list_mtx)
static eventhandler_tag bridge_detach_cookie;
int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD;
VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone);
#define V_bridge_rtnode_zone VNET(bridge_rtnode_zone)
static int bridge_clone_create(struct if_clone *, int, caddr_t);
static void bridge_clone_destroy(struct ifnet *);
static int bridge_ioctl(struct ifnet *, u_long, caddr_t);
static void bridge_mutecaps(struct bridge_softc *);
static void bridge_set_ifcap(struct bridge_softc *, 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 int bridge_transmit(struct ifnet *, struct mbuf *);
static void bridge_qflush(struct ifnet *);
static struct mbuf *bridge_input(struct ifnet *, struct mbuf *);
static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static int bridge_enqueue(struct bridge_softc *, struct ifnet *,
struct mbuf *);
static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int);
static void bridge_forward(struct bridge_softc *, struct bridge_iflist *,
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 *,
uint16_t, struct bridge_iflist *, int, uint8_t);
static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *,
uint16_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 *,
uint16_t);
static void 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 *, uint16_t);
static int bridge_rtnode_insert(struct bridge_softc *,
struct bridge_rtnode *);
static void bridge_rtnode_destroy(struct bridge_softc *,
struct bridge_rtnode *);
static void bridge_rtable_expire(struct ifnet *, int);
static void bridge_state_change(struct ifnet *, int);
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_sifmaxaddr(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_ioctl_gbparam(struct bridge_softc *, void *);
static int bridge_ioctl_grte(struct bridge_softc *, void *);
static int bridge_ioctl_gifsstp(struct bridge_softc *, void *);
static int bridge_ioctl_sproto(struct bridge_softc *, void *);
static int bridge_ioctl_stxhc(struct bridge_softc *, void *);
static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *,
int);
static int bridge_ip_checkbasic(struct mbuf **mp);
#ifdef INET6
static int bridge_ip6_checkbasic(struct mbuf **mp);
#endif /* INET6 */
static int bridge_fragment(struct ifnet *, struct mbuf **mp,
struct ether_header *, int, struct llc *);
static void bridge_linkstate(struct ifnet *ifp);
static void bridge_linkcheck(struct bridge_softc *sc);
/* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */
#define VLANTAGOF(_m) \
(_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1
static struct bstp_cb_ops bridge_ops = {
.bcb_state = bridge_state_change,
.bcb_rtage = bridge_rtable_expire
};
SYSCTL_DECL(_net_link);
static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge");
/* only pass IP[46] packets when pfil is enabled */
VNET_DEFINE_STATIC(int, pfil_onlyip) = 1;
#define V_pfil_onlyip VNET(pfil_onlyip)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0,
"Only pass IP packets when pfil is enabled");
/* run pfil hooks on the bridge interface */
VNET_DEFINE_STATIC(int, pfil_bridge) = 1;
#define V_pfil_bridge VNET(pfil_bridge)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0,
"Packet filter on the bridge interface");
/* layer2 filter with ipfw */
VNET_DEFINE_STATIC(int, pfil_ipfw);
#define V_pfil_ipfw VNET(pfil_ipfw)
/* layer2 ARP filter with ipfw */
VNET_DEFINE_STATIC(int, pfil_ipfw_arp);
#define V_pfil_ipfw_arp VNET(pfil_ipfw_arp)
SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0,
"Filter ARP packets through IPFW layer2");
/* run pfil hooks on the member interface */
VNET_DEFINE_STATIC(int, pfil_member) = 1;
#define V_pfil_member VNET(pfil_member)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0,
"Packet filter on the member interface");
/* run pfil hooks on the physical interface for locally destined packets */
VNET_DEFINE_STATIC(int, pfil_local_phys);
#define V_pfil_local_phys VNET(pfil_local_phys)
SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0,
"Packet filter on the physical interface for locally destined packets");
/* log STP state changes */
VNET_DEFINE_STATIC(int, log_stp);
#define V_log_stp VNET(log_stp)
SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0,
"Log STP state changes");
/* share MAC with first bridge member */
VNET_DEFINE_STATIC(int, bridge_inherit_mac);
#define V_bridge_inherit_mac VNET(bridge_inherit_mac)
SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac,
CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0,
"Inherit MAC address from the first bridge member");
VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0;
#define V_allow_llz_overlap VNET(allow_llz_overlap)
SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap,
CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0,
"Allow overlap of link-local scope "
"zones of a bridge interface and the member interfaces");
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 },
{ bridge_ioctl_gbparam, sizeof(struct ifbropreq),
BC_F_COPYOUT },
{ bridge_ioctl_grte, sizeof(struct ifbrparam),
BC_F_COPYOUT },
{ bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf),
BC_F_COPYIN|BC_F_COPYOUT },
{ bridge_ioctl_sproto, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_stxhc, sizeof(struct ifbrparam),
BC_F_COPYIN|BC_F_SUSER },
{ bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq),
BC_F_COPYIN|BC_F_SUSER },
};
const int bridge_control_table_size = nitems(bridge_control_table);
VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list);
#define V_bridge_list VNET(bridge_list)
#define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \
"if_bridge list", NULL, MTX_DEF)
#define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx)
#define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx)
#define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx)
VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner);
#define V_bridge_cloner VNET(bridge_cloner)
static const char bridge_name[] = "bridge";
static void
vnet_bridge_init(const void *unused __unused)
{
V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode",
sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
BRIDGE_LIST_LOCK_INIT();
LIST_INIT(&V_bridge_list);
V_bridge_cloner = if_clone_simple(bridge_name,
bridge_clone_create, bridge_clone_destroy, 0);
}
VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_bridge_init, NULL);
static void
vnet_bridge_uninit(const void *unused __unused)
{
if_clone_detach(V_bridge_cloner);
V_bridge_cloner = NULL;
BRIDGE_LIST_LOCK_DESTROY();
uma_zdestroy(V_bridge_rtnode_zone);
}
VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_bridge_uninit, NULL);
static int
bridge_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
bridge_dn_p = bridge_dummynet;
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);
bridge_dn_p = NULL;
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);
MODULE_VERSION(if_bridge, 1);
MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1);
/*
* handler for net.link.bridge.ipfw
*/
static int
sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS)
{
int enable = V_pfil_ipfw;
int error;
error = sysctl_handle_int(oidp, &enable, 0, req);
enable &= 1;
if (enable != V_pfil_ipfw) {
V_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 (V_pfil_ipfw) {
V_pfil_onlyip = 0;
V_pfil_bridge = 0;
V_pfil_member = 0;
}
}
return (error);
}
SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET,
&VNET_NAME(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, caddr_t params)
{
struct bridge_softc *sc, *sc2;
struct ifnet *bifp, *ifp;
int fb, retry;
unsigned long hostid;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
free(sc, M_DEVBUF);
return (ENOSPC);
}
BRIDGE_LOCK_INIT(sc);
sc->sc_brtmax = BRIDGE_RTABLE_MAX;
sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT;
/* Initialize our routing table. */
bridge_rtable_init(sc);
callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0);
LIST_INIT(&sc->sc_iflist);
LIST_INIT(&sc->sc_spanlist);
ifp->if_softc = sc;
if_initname(ifp, bridge_name, unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = bridge_ioctl;
ifp->if_transmit = bridge_transmit;
ifp->if_qflush = bridge_qflush;
ifp->if_init = bridge_init;
ifp->if_type = IFT_BRIDGE;
/*
* Generate an ethernet address with a locally administered address.
*
* Since we are using random ethernet addresses for the bridge, it is
* possible that we might have address collisions, so make sure that
* this hardware address isn't already in use on another bridge.
* The first try uses the hostid and falls back to arc4rand().
*/
fb = 0;
getcredhostid(curthread->td_ucred, &hostid);
do {
if (fb || hostid == 0) {
ether_gen_addr(ifp, &sc->sc_defaddr);
} else {
sc->sc_defaddr.octet[0] = 0x2;
sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
sc->sc_defaddr.octet[4] = hostid & 0xff;
sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
}
fb = 1;
retry = 0;
BRIDGE_LIST_LOCK();
LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
bifp = sc2->sc_ifp;
if (memcmp(sc->sc_defaddr.octet,
IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
retry = 1;
break;
}
}
BRIDGE_LIST_UNLOCK();
} while (retry == 1);
bstp_attach(&sc->sc_stp, &bridge_ops);
ether_ifattach(ifp, sc->sc_defaddr.octet);
/* Now undo some of the damage... */
ifp->if_baudrate = 0;
ifp->if_type = IFT_BRIDGE;
BRIDGE_LIST_LOCK();
LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list);
BRIDGE_LIST_UNLOCK();
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);
}
/* Tear down the routing table. */
bridge_rtable_fini(sc);
BRIDGE_UNLOCK(sc);
callout_drain(&sc->sc_brcallout);
BRIDGE_LIST_LOCK();
LIST_REMOVE(sc, sc_list);
BRIDGE_LIST_UNLOCK();
bstp_detach(&sc->sc_stp);
ether_ifdetach(ifp);
if_free(ifp);
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 ifreq *ifr = (struct ifreq *)data;
struct bridge_iflist *bif;
struct thread *td = curthread;
union {
struct ifbreq ifbreq;
struct ifbifconf ifbifconf;
struct ifbareq ifbareq;
struct ifbaconf ifbaconf;
struct ifbrparam ifbrparam;
struct ifbropreq ifbropreq;
} args;
struct ifdrv *ifd = (struct ifdrv *) data;
const struct bridge_control *bc;
int error = 0;
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 = priv_check(td, PRIV_NET_BRIDGE);
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;
}
BRIDGE_LOCK(sc);
error = (*bc->bc_func)(sc, &args);
BRIDGE_UNLOCK(sc);
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_LOCK(sc);
bridge_stop(ifp, 1);
BRIDGE_UNLOCK(sc);
} 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.
*/
(*ifp->if_init)(sc);
}
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu < 576) {
error = EINVAL;
break;
}
if (LIST_EMPTY(&sc->sc_iflist)) {
sc->sc_ifp->if_mtu = ifr->ifr_mtu;
break;
}
BRIDGE_LOCK(sc);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) {
log(LOG_NOTICE, "%s: invalid MTU: %u(%s)"
" != %d\n", sc->sc_ifp->if_xname,
bif->bif_ifp->if_mtu,
bif->bif_ifp->if_xname, ifr->ifr_mtu);
error = EINVAL;
break;
}
}
if (!error)
sc->sc_ifp->if_mtu = ifr->ifr_mtu;
BRIDGE_UNLOCK(sc);
break;
default:
/*
* drop the lock as ether_ioctl() will call bridge_start() and
* cause the lock to be recursed.
*/
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
/*
* bridge_mutecaps:
*
* Clear or restore unwanted capabilities on the member interface
*/
static void
bridge_mutecaps(struct bridge_softc *sc)
{
struct bridge_iflist *bif;
int enabled, mask;
/* Initial bitmask of capabilities to test */
mask = BRIDGE_IFCAPS_MASK;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
/* Every member must support it or its disabled */
mask &= bif->bif_savedcaps;
}
BRIDGE_XLOCK(sc);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
enabled = bif->bif_ifp->if_capenable;
enabled &= ~BRIDGE_IFCAPS_STRIP;
/* strip off mask bits and enable them again if allowed */
enabled &= ~BRIDGE_IFCAPS_MASK;
enabled |= mask;
BRIDGE_UNLOCK(sc);
bridge_set_ifcap(sc, bif, enabled);
BRIDGE_LOCK(sc);
}
BRIDGE_XDROP(sc);
}
static void
bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set)
{
struct ifnet *ifp = bif->bif_ifp;
struct ifreq ifr;
int error, mask, stuck;
BRIDGE_UNLOCK_ASSERT(sc);
bzero(&ifr, sizeof(ifr));
ifr.ifr_reqcap = set;
if (ifp->if_capenable != set) {
error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr);
if (error)
if_printf(sc->sc_ifp,
"error setting capabilities on %s: %d\n",
ifp->if_xname, error);
mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP;
stuck = ifp->if_capenable & mask & ~set;
if (stuck != 0)
if_printf(sc->sc_ifp,
"can't disable some capabilities on %s: 0x%x\n",
ifp->if_xname, stuck);
}
}
/*
* 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;
struct ifnet *fif = NULL;
BRIDGE_LOCK_ASSERT(sc);
if (bif->bif_flags & IFBIF_STP)
bstp_disable(&bif->bif_stp);
ifs->if_bridge = NULL;
BRIDGE_XLOCK(sc);
LIST_REMOVE(bif, bif_next);
BRIDGE_XDROP(sc);
/*
* If removing the interface that gave the bridge its mac address, set
* the mac address of the bridge to the address of the next member, or
* to its default address if no members are left.
*/
if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) {
if (LIST_EMPTY(&sc->sc_iflist)) {
bcopy(&sc->sc_defaddr,
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = NULL;
} else {
fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp;
bcopy(IF_LLADDR(fif),
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = fif;
}
EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
}
bridge_linkcheck(sc);
bridge_mutecaps(sc); /* recalcuate now this interface is removed */
bridge_rtdelete(sc, ifs, IFBF_FLUSHALL);
KASSERT(bif->bif_addrcnt == 0,
("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt));
ifs->if_bridge_output = NULL;
ifs->if_bridge_input = NULL;
ifs->if_bridge_linkstate = NULL;
BRIDGE_UNLOCK(sc);
if (!gone) {
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
/*
* Take the interface out of promiscuous mode, but only
* if it was promiscuous in the first place. It might
* not be if we're in the bridge_ioctl_add() error path.
*/
if (ifs->if_flags & IFF_PROMISC)
(void) ifpromisc(ifs, 0);
break;
case IFT_GIF:
break;
default:
#ifdef DIAGNOSTIC
panic("bridge_delete_member: impossible");
#endif
break;
}
/* reneable any interface capabilities */
bridge_set_ifcap(sc, bif, bif->bif_savedcaps);
}
bstp_destroy(&bif->bif_stp); /* prepare to free */
BRIDGE_LOCK(sc);
free(bif, M_DEVBUF);
}
/*
* 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;
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
if (ifs->if_ioctl == NULL) /* must be supported */
return (EINVAL);
/* 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);
if (ifs->if_bridge == sc)
return (EEXIST);
if (ifs->if_bridge != NULL)
return (EBUSY);
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
case IFT_GIF:
/* permitted interface types */
break;
default:
return (EINVAL);
}
#ifdef INET6
/*
* Two valid inet6 addresses with link-local scope must not be
* on the parent interface and the member interfaces at the
* same time. This restriction is needed to prevent violation
* of link-local scope zone. Attempts to add a member
* interface which has inet6 addresses when the parent has
* inet6 triggers removal of all inet6 addresses on the member
* interface.
*/
/* Check if the parent interface has a link-local scope addr. */
if (V_allow_llz_overlap == 0 &&
in6ifa_llaonifp(sc->sc_ifp) != NULL) {
/*
* If any, remove all inet6 addresses from the member
* interfaces.
*/
BRIDGE_XLOCK(sc);
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (in6ifa_llaonifp(bif->bif_ifp)) {
BRIDGE_UNLOCK(sc);
in6_ifdetach(bif->bif_ifp);
BRIDGE_LOCK(sc);
if_printf(sc->sc_ifp,
"IPv6 addresses on %s have been removed "
"before adding it as a member to prevent "
"IPv6 address scope violation.\n",
bif->bif_ifp->if_xname);
}
}
BRIDGE_XDROP(sc);
if (in6ifa_llaonifp(ifs)) {
BRIDGE_UNLOCK(sc);
in6_ifdetach(ifs);
BRIDGE_LOCK(sc);
if_printf(sc->sc_ifp,
"IPv6 addresses on %s have been removed "
"before adding it as a member to prevent "
"IPv6 address scope violation.\n",
ifs->if_xname);
}
}
#endif
/* Allow the first Ethernet member to define the MTU */
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: %u(%s) != %u\n",
ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu);
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_LEARNING | IFBIF_DISCOVER;
bif->bif_savedcaps = ifs->if_capenable;
/*
* Assign the interface's MAC address to the bridge if it's the first
* member and the MAC address of the bridge has not been changed from
* the default randomly generated one.
*/
if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) &&
!memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) {
bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
sc->sc_ifaddr = ifs;
EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
}
ifs->if_bridge = sc;
ifs->if_bridge_output = bridge_output;
ifs->if_bridge_input = bridge_input;
ifs->if_bridge_linkstate = bridge_linkstate;
bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp);
/*
* XXX: XLOCK HERE!?!
*
* NOTE: insert_***HEAD*** should be safe for the traversals.
*/
LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next);
/* Set interface capabilities to the intersection set of all members */
bridge_mutecaps(sc);
bridge_linkcheck(sc);
/* Place the interface into promiscuous mode */
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_L2VLAN:
BRIDGE_UNLOCK(sc);
error = ifpromisc(ifs, 1);
BRIDGE_LOCK(sc);
break;
}
if (error)
bridge_delete_member(sc, bif, 0);
return (error);
}
static int
bridge_ioctl_del(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);
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;
struct bstp_port *bp;
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bp = &bif->bif_stp;
req->ifbr_ifsflags = bif->bif_flags;
req->ifbr_state = bp->bp_state;
req->ifbr_priority = bp->bp_priority;
req->ifbr_path_cost = bp->bp_path_cost;
req->ifbr_portno = bif->bif_ifp->if_index & 0xfff;
req->ifbr_proto = bp->bp_protover;
req->ifbr_role = bp->bp_role;
req->ifbr_stpflags = bp->bp_flags;
req->ifbr_addrcnt = bif->bif_addrcnt;
req->ifbr_addrmax = bif->bif_addrmax;
req->ifbr_addrexceeded = bif->bif_addrexceeded;
/* Copy STP state options as flags */
if (bp->bp_operedge)
req->ifbr_ifsflags |= IFBIF_BSTP_EDGE;
if (bp->bp_flags & BSTP_PORT_AUTOEDGE)
req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE;
if (bp->bp_ptp_link)
req->ifbr_ifsflags |= IFBIF_BSTP_PTP;
if (bp->bp_flags & BSTP_PORT_AUTOPTP)
req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP;
if (bp->bp_flags & BSTP_PORT_ADMEDGE)
req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE;
if (bp->bp_flags & BSTP_PORT_ADMCOST)
req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST;
return (0);
}
static int
bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
struct bstp_port *bp;
int error;
bif = bridge_lookup_member(sc, req->ifbr_ifsname);
if (bif == NULL)
return (ENOENT);
bp = &bif->bif_stp;
if (req->ifbr_ifsflags & IFBIF_SPAN)
/* SPAN is readonly */
return (EINVAL);
if (req->ifbr_ifsflags & IFBIF_STP) {
if ((bif->bif_flags & IFBIF_STP) == 0) {
error = bstp_enable(&bif->bif_stp);
if (error)
return (error);
}
} else {
if ((bif->bif_flags & IFBIF_STP) != 0)
bstp_disable(&bif->bif_stp);
}
/* Pass on STP flags */
bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0);
bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0);
bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0);
bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0);
/* Save the bits relating to the bridge */
bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK;
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 breq;
char *buf, *outbuf;
int count, buflen, len, error = 0;
count = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next)
count++;
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
count++;
buflen = sizeof(breq) * count;
if (bifc->ifbic_len == 0) {
bifc->ifbic_len = buflen;
return (0);
}
BRIDGE_UNLOCK(sc);
outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
BRIDGE_LOCK(sc);
count = 0;
buf = outbuf;
len = min(bifc->ifbic_len, buflen);
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));
/* Fill in the ifbreq structure */
error = bridge_ioctl_gifflags(sc, &breq);
if (error)
break;
memcpy(buf, &breq, sizeof(breq));
count++;
buf += sizeof(breq);
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_portno = bif->bif_ifp->if_index & 0xfff;
memcpy(buf, &breq, sizeof(breq));
count++;
buf += sizeof(breq);
len -= sizeof(breq);
}
BRIDGE_UNLOCK(sc);
bifc->ifbic_len = sizeof(breq) * count;
error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len);
BRIDGE_LOCK(sc);
free(outbuf, M_TEMP);
return (error);
}
static int
bridge_ioctl_rts(struct bridge_softc *sc, void *arg)
{
struct ifbaconf *bac = arg;
struct bridge_rtnode *brt;
struct ifbareq bareq;
char *buf, *outbuf;
int count, buflen, len, error = 0;
if (bac->ifbac_len == 0)
return (0);
count = 0;
LIST_FOREACH(brt, &sc->sc_rtlist, brt_list)
count++;
buflen = sizeof(bareq) * count;
BRIDGE_UNLOCK(sc);
outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
BRIDGE_LOCK(sc);
count = 0;
buf = outbuf;
len = min(bac->ifbac_len, buflen);
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));
bareq.ifba_vlan = brt->brt_vlan;
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;
memcpy(buf, &bareq, sizeof(bareq));
count++;
buf += sizeof(bareq);
len -= sizeof(bareq);
}
out:
BRIDGE_UNLOCK(sc);
bac->ifbac_len = sizeof(bareq) * count;
error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len);
BRIDGE_LOCK(sc);
free(outbuf, M_TEMP);
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, req->ifba_vlan, bif, 1,
req->ifba_flags);
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, req->ifba_vlan));
}
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;
struct bstp_state *bs = &sc->sc_stp;
param->ifbrp_prio = bs->bs_bridge_priority;
return (0);
}
static int
bridge_ioctl_spri(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio));
}
static int
bridge_ioctl_ght(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
struct bstp_state *bs = &sc->sc_stp;
param->ifbrp_hellotime = bs->bs_bridge_htime >> 8;
return (0);
}
static int
bridge_ioctl_sht(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime));
}
static int
bridge_ioctl_gfd(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
struct bstp_state *bs = &sc->sc_stp;
param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8;
return (0);
}
static int
bridge_ioctl_sfd(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay));
}
static int
bridge_ioctl_gma(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
struct bstp_state *bs = &sc->sc_stp;
param->ifbrp_maxage = bs->bs_bridge_max_age >> 8;
return (0);
}
static int
bridge_ioctl_sma(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage));
}
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);
return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority));
}
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);
return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost));
}
static int
bridge_ioctl_sifmaxaddr(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_addrmax = req->ifbr_addrmax;
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;
ifs = ifunit(req->ifbr_ifsname);
if (ifs == NULL)
return (ENOENT);
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next)
if (ifs == bif->bif_ifp)
return (EBUSY);
if (ifs->if_bridge != NULL)
return (EBUSY);
switch (ifs->if_type) {
case IFT_ETHER:
case IFT_GIF:
case IFT_L2VLAN:
break;
default:
return (EINVAL);
}
bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO);
if (bif == NULL)
return (ENOMEM);
bif->bif_ifp = ifs;
bif->bif_flags = IFBIF_SPAN;
LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next);
return (0);
}
static int
bridge_ioctl_delspan(struct bridge_softc *sc, void *arg)
{
struct ifbreq *req = arg;
struct bridge_iflist *bif;
struct ifnet *ifs;
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);
}
static int
bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg)
{
struct ifbropreq *req = arg;
struct bstp_state *bs = &sc->sc_stp;
struct bstp_port *root_port;
req->ifbop_maxage = bs->bs_bridge_max_age >> 8;
req->ifbop_hellotime = bs->bs_bridge_htime >> 8;
req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8;
root_port = bs->bs_root_port;
if (root_port == NULL)
req->ifbop_root_port = 0;
else
req->ifbop_root_port = root_port->bp_ifp->if_index;
req->ifbop_holdcount = bs->bs_txholdcount;
req->ifbop_priority = bs->bs_bridge_priority;
req->ifbop_protocol = bs->bs_protover;
req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost;
req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id;
req->ifbop_designated_root = bs->bs_root_pv.pv_root_id;
req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id;
req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec;
req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec;
return (0);
}
static int
bridge_ioctl_grte(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
param->ifbrp_cexceeded = sc->sc_brtexceeded;
return (0);
}
static int
bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg)
{
struct ifbpstpconf *bifstp = arg;
struct bridge_iflist *bif;
struct bstp_port *bp;
struct ifbpstpreq bpreq;
char *buf, *outbuf;
int count, buflen, len, error = 0;
count = 0;
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if ((bif->bif_flags & IFBIF_STP) != 0)
count++;
}
buflen = sizeof(bpreq) * count;
if (bifstp->ifbpstp_len == 0) {
bifstp->ifbpstp_len = buflen;
return (0);
}
BRIDGE_UNLOCK(sc);
outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
BRIDGE_LOCK(sc);
count = 0;
buf = outbuf;
len = min(bifstp->ifbpstp_len, buflen);
bzero(&bpreq, sizeof(bpreq));
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (len < sizeof(bpreq))
break;
if ((bif->bif_flags & IFBIF_STP) == 0)
continue;
bp = &bif->bif_stp;
bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff;
bpreq.ifbp_fwd_trans = bp->bp_forward_transitions;
bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost;
bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id;
bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id;
bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id;
memcpy(buf, &bpreq, sizeof(bpreq));
count++;
buf += sizeof(bpreq);
len -= sizeof(bpreq);
}
BRIDGE_UNLOCK(sc);
bifstp->ifbpstp_len = sizeof(bpreq) * count;
error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len);
BRIDGE_LOCK(sc);
free(outbuf, M_TEMP);
return (error);
}
static int
bridge_ioctl_sproto(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto));
}
static int
bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg)
{
struct ifbrparam *param = arg;
return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc));
}
/*
* 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;
if (ifp->if_flags & IFF_RENAMING)
return;
if (V_bridge_cloner == NULL) {
/*
* This detach handler can be called after
* vnet_bridge_uninit(). Just return in that case.
*/
return;
}
/* 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 */
BRIDGE_LIST_LOCK();
LIST_FOREACH(sc, &V_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);
}
BRIDGE_LIST_UNLOCK();
}
/*
* 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_init(&sc->sc_stp); /* Initialize Spanning Tree */
BRIDGE_UNLOCK(sc);
}
/*
* bridge_stop:
*
* Stop the bridge interface.
*/
static void
bridge_stop(struct ifnet *ifp, int disable)
{
struct bridge_softc *sc = ifp->if_softc;
BRIDGE_LOCK_ASSERT(sc);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
callout_stop(&sc->sc_brcallout);
bstp_stop(&sc->sc_stp);
bridge_rtflush(sc, IFBF_FLUSHDYN);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
/*
* bridge_enqueue:
*
* Enqueue a packet on a bridge member interface.
*
*/
static int
bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m)
{
int len, err = 0;
short mflags;
struct mbuf *m0;
/* We may be sending a fragment so traverse the mbuf */
for (; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = NULL;
len = m->m_pkthdr.len;
mflags = m->m_flags;
/*
* If underlying interface can not do VLAN tag insertion itself
* then attach a packet tag that holds it.
*/
if ((m->m_flags & M_VLANTAG) &&
(dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
if (m == NULL) {
if_printf(dst_ifp,
"unable to prepend VLAN header\n");
if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1);
continue;
}
m->m_flags &= ~M_VLANTAG;
}
M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */
if ((err = dst_ifp->if_transmit(dst_ifp, m))) {
m_freem(m0);
if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
break;
}
if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len);
if (mflags & M_MCAST)
if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1);
}
return (err);
}
/*
* 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_OUT(V_inet_pfil_head)
#ifdef INET6
|| PFIL_HOOKED_OUT(V_inet6_pfil_head)
#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 *bifp, *dst_if;
struct bridge_softc *sc;
uint16_t vlan;
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;
vlan = VLANTAGOF(m);
BRIDGE_LOCK(sc);
bifp = sc->sc_ifp;
/*
* 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 ((bifp->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, vlan);
/* Tap any traffic not passing back out the originating interface */
if (dst_if != ifp)
ETHER_BPF_MTAP(bifp, m);
if (dst_if == NULL) {
struct bridge_iflist *bif;
struct mbuf *mc;
int error = 0, used = 0;
bridge_span(sc, m);
BRIDGE_LOCK2REF(sc, error);
if (error) {
m_freem(m);
return (0);
}
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) &&
bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
continue;
if (LIST_NEXT(bif, bif_next) == NULL) {
used = 1;
mc = m;
} else {
mc = m_copypacket(m, M_NOWAIT);
if (mc == NULL) {
if_inc_counter(bifp, IFCOUNTER_OERRORS, 1);
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_transmit:
*
* Do output on a bridge.
*
*/
static int
bridge_transmit(struct ifnet *ifp, struct mbuf *m)
{
struct bridge_softc *sc;
struct ether_header *eh;
struct ifnet *dst_if;
int error = 0;
sc = ifp->if_softc;
ETHER_BPF_MTAP(ifp, m);
eh = mtod(m, struct ether_header *);
BRIDGE_LOCK(sc);
if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) &&
(dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) {
BRIDGE_UNLOCK(sc);
error = bridge_enqueue(sc, dst_if, m);
} else
bridge_broadcast(sc, ifp, m, 0);
return (error);
}
/*
* The ifp->if_qflush entry point for if_bridge(4) is no-op.
*/
static void
bridge_qflush(struct ifnet *ifp __unused)
{
}
/*
* bridge_forward:
*
* The forwarding function of the bridge.
*
* NOTE: Releases the lock on return.
*/
static void
bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif,
struct mbuf *m)
{
struct bridge_iflist *dbif;
struct ifnet *src_if, *dst_if, *ifp;
struct ether_header *eh;
uint16_t vlan;
uint8_t *dst;
int error;
src_if = m->m_pkthdr.rcvif;
ifp = sc->sc_ifp;
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
vlan = VLANTAGOF(m);
if ((sbif->bif_flags & IFBIF_STP) &&
sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
goto drop;
eh = mtod(m, struct ether_header *);
dst = eh->ether_dhost;
/* If the interface is learning, record the address. */
if (sbif->bif_flags & IFBIF_LEARNING) {
error = bridge_rtupdate(sc, eh->ether_shost, vlan,
sbif, 0, IFBAF_DYNAMIC);
/*
* If the interface has addresses limits then deny any source
* that is not in the cache.
*/
if (error && sbif->bif_addrmax)
goto drop;
}
if ((sbif->bif_flags & IFBIF_STP) != 0 &&
sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING)
goto drop;
/*
* 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, dst, vlan);
if (src_if == dst_if)
goto drop;
} else {
/*
* Check if its a reserved multicast address, any address
* listed in 802.1D section 7.12.6 may not be forwarded by the
* bridge.
* This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F
*/
if (dst[0] == 0x01 && dst[1] == 0x80 &&
dst[2] == 0xc2 && dst[3] == 0x00 &&
dst[4] == 0x00 && dst[5] <= 0x0f)
goto drop;
/* ...forward it to all interfaces. */
if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
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)
ETHER_BPF_MTAP(ifp, m);
/* run the packet filter */
if (PFIL_HOOKED_IN(V_inet_pfil_head)
#ifdef INET6
|| PFIL_HOOKED_IN(V_inet6_pfil_head)
#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)
goto drop;
dbif = bridge_lookup_member_if(sc, dst_if);
if (dbif == NULL)
/* Not a member of the bridge (anymore?) */
goto drop;
/* Private segments can not talk to each other */
if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)
goto drop;
if ((dbif->bif_flags & IFBIF_STP) &&
dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
goto drop;
BRIDGE_UNLOCK(sc);
if (PFIL_HOOKED_OUT(V_inet_pfil_head)
#ifdef INET6
|| PFIL_HOOKED_OUT(V_inet6_pfil_head)
#endif
) {
if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0)
return;
if (m == NULL)
return;
}
bridge_enqueue(sc, dst_if, m);
return;
drop:
BRIDGE_UNLOCK(sc);
m_freem(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, *bif2;
struct ifnet *bifp;
struct ether_header *eh;
struct mbuf *mc, *mc2;
uint16_t vlan;
int error;
if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return (m);
bifp = sc->sc_ifp;
vlan = VLANTAGOF(m);
/*
* 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;
ETHER_BPF_MTAP(bifp, m);
if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1);
if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
m_freem(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 *);
bridge_span(sc, m);
if (m->m_flags & (M_BCAST|M_MCAST)) {
/* Tap off 802.1D packets; they do not get forwarded. */
if (memcmp(eh->ether_dhost, bstp_etheraddr,
ETHER_ADDR_LEN) == 0) {
bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */
BRIDGE_UNLOCK(sc);
return (NULL);
}
if ((bif->bif_flags & IFBIF_STP) &&
bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
BRIDGE_UNLOCK(sc);
return (m);
}
/*
* 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_NOWAIT);
if (mc == NULL) {
BRIDGE_UNLOCK(sc);
return (m);
}
/* Perform the bridge forwarding function with the copy. */
bridge_forward(sc, bif, 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_NOWAIT);
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) &&
bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
BRIDGE_UNLOCK(sc);
return (m);
}
#if (defined(INET) || defined(INET6))
# define OR_CARP_CHECK_WE_ARE_DST(iface) \
|| ((iface)->if_carp \
&& (*carp_forus_p)((iface), eh->ether_dhost))
# define OR_CARP_CHECK_WE_ARE_SRC(iface) \
|| ((iface)->if_carp \
&& (*carp_forus_p)((iface), eh->ether_shost))
#else
# define OR_CARP_CHECK_WE_ARE_DST(iface)
# define OR_CARP_CHECK_WE_ARE_SRC(iface)
#endif
#ifdef INET6
# define OR_PFIL_HOOKED_INET6 \
|| PFIL_HOOKED_IN(V_inet6_pfil_head)
#else
# define OR_PFIL_HOOKED_INET6
#endif
#define GRAB_OUR_PACKETS(iface) \
if ((iface)->if_type == IFT_GIF) \
continue; \
/* It is destined for us. */ \
if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
OR_CARP_CHECK_WE_ARE_DST((iface)) \
) { \
if (bif->bif_flags & IFBIF_LEARNING) { \
error = bridge_rtupdate(sc, eh->ether_shost, \
vlan, bif, 0, IFBAF_DYNAMIC); \
if (error && bif->bif_addrmax) { \
BRIDGE_UNLOCK(sc); \
m_freem(m); \
return (NULL); \
} \
} \
m->m_pkthdr.rcvif = iface; \
if ((iface) == ifp) { \
/* Skip bridge processing... src == dest */ \
BRIDGE_UNLOCK(sc); \
return (m); \
} \
/* It's passing over or to the bridge, locally. */ \
ETHER_BPF_MTAP(bifp, m); \
if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \
if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \
/* Filter on the physical interface. */ \
if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) \
OR_PFIL_HOOKED_INET6)) { \
if (bridge_pfil(&m, NULL, ifp, \
PFIL_IN) != 0 || m == NULL) { \
BRIDGE_UNLOCK(sc); \
return (NULL); \
} \
} \
if ((iface) != bifp) \
ETHER_BPF_MTAP(iface, m); \
BRIDGE_UNLOCK(sc); \
return (m); \
} \
\
/* We just received a packet that we sent out. */ \
if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
OR_CARP_CHECK_WE_ARE_SRC((iface)) \
) { \
BRIDGE_UNLOCK(sc); \
m_freem(m); \
return (NULL); \
}
/*
* Unicast. Make sure it's not for the bridge.
*/
do { GRAB_OUR_PACKETS(bifp) } while (0);
/*
* Give a chance for ifp at first priority. This will help when the
* packet comes through the interface like VLAN's with the same MACs
* on several interfaces from the same bridge. This also will save
* some CPU cycles in case the destination interface and the input
* interface (eq ifp) are the same.
*/
do { GRAB_OUR_PACKETS(ifp) } while (0);
/* Now check the all bridge members. */
LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
GRAB_OUR_PACKETS(bif2->bif_ifp)
}
#undef OR_CARP_CHECK_WE_ARE_DST
#undef OR_CARP_CHECK_WE_ARE_SRC
#undef OR_PFIL_HOOKED_INET6
#undef GRAB_OUR_PACKETS
/* Perform the bridge forwarding function. */
bridge_forward(sc, bif, 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 *dbif, *sbif;
struct mbuf *mc;
struct ifnet *dst_if;
int error = 0, used = 0, i;
sbif = bridge_lookup_member_if(sc, src_if);
BRIDGE_LOCK2REF(sc, error);
if (error) {
m_freem(m);
return;
}
/* Filter on the bridge interface before broadcasting */
if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head)
#ifdef INET6
|| PFIL_HOOKED_OUT(V_inet6_pfil_head)
#endif
)) {
if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0)
goto out;
if (m == NULL)
goto out;
}
LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) {
dst_if = dbif->bif_ifp;
if (dst_if == src_if)
continue;
/* Private segments can not talk to each other */
if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE))
continue;
if ((dbif->bif_flags & IFBIF_STP) &&
dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING)
continue;
if ((dbif->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(dbif, bif_next) == NULL) {
mc = m;
used = 1;
} else {
mc = m_dup(m, M_NOWAIT);
if (mc == NULL) {
if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
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_OUT(V_inet_pfil_head)
#ifdef INET6
|| PFIL_HOOKED_OUT(V_inet6_pfil_head)
#endif
)) {
if (used == 0) {
/* Keep the layer3 header aligned */
i = min(mc->m_pkthdr.len, max_protohdr);
mc = m_copyup(mc, i, ETHER_ALIGN);
if (mc == NULL) {
if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
continue;
}
}
if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0)
continue;
if (mc == NULL)
continue;
}
bridge_enqueue(sc, dst_if, mc);
}
if (used == 0)
m_freem(m);
out:
BRIDGE_UNREF(sc);
}
/*
* bridge_span:
*
* Duplicate a packet out one or more interfaces that are in span mode,
* the original mbuf is unmodified.
*/
static void
bridge_span(struct bridge_softc *sc, struct mbuf *m)
{
struct bridge_iflist *bif;
struct ifnet *dst_if;
struct mbuf *mc;
if (LIST_EMPTY(&sc->sc_spanlist))
return;
LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) {
dst_if = bif->bif_ifp;
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
continue;
mc = m_copypacket(m, M_NOWAIT);
if (mc == NULL) {
if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1);
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, uint16_t vlan,
struct bridge_iflist *bif, int setflags, uint8_t flags)
{
struct bridge_rtnode *brt;
int error;
BRIDGE_LOCK_ASSERT(sc);
/* Check the source address is valid and not multicast. */
if (ETHER_IS_MULTICAST(dst) ||
(dst[0] == 0 && dst[1] == 0 && dst[2] == 0 &&
dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0)
return (EINVAL);
/* 802.1p frames map to vlan 1 */
if (vlan == 0)
vlan = 1;
/*
* A route for this destination might already exist. If so,
* update it, otherwise create a new one.
*/
if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) {
if (sc->sc_brtcnt >= sc->sc_brtmax) {
sc->sc_brtexceeded++;
return (ENOSPC);
}
/* Check per interface address limits (if enabled) */
if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) {
bif->bif_addrexceeded++;
return (ENOSPC);
}
/*
* Allocate a new bridge forwarding node, and
* initialize the expiration time and Ethernet
* address.
*/
brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO);
if (brt == NULL)
return (ENOMEM);
if (bif->bif_flags & IFBIF_STICKY)
brt->brt_flags = IFBAF_STICKY;
else
brt->brt_flags = IFBAF_DYNAMIC;
memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN);
brt->brt_vlan = vlan;
if ((error = bridge_rtnode_insert(sc, brt)) != 0) {
uma_zfree(V_bridge_rtnode_zone, brt);
return (error);
}
brt->brt_dst = bif;
bif->bif_addrcnt++;
}
if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC &&
brt->brt_dst != bif) {
brt->brt_dst->bif_addrcnt--;
brt->brt_dst = bif;
brt->brt_dst->bif_addrcnt++;
}
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, uint16_t vlan)
{
struct bridge_rtnode *brt;
BRIDGE_LOCK_ASSERT(sc);
if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == 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;
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
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);
/* Destruction of rtnodes requires a proper vnet context */
CURVNET_SET(sc->sc_ifp->if_vnet);
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);
CURVNET_RESTORE();
}
/*
* bridge_rtage:
*
* Perform an aging cycle.
*/
static void
bridge_rtage(struct bridge_softc *sc)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
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);
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
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, uint16_t vlan)
{
struct bridge_rtnode *brt;
int found = 0;
BRIDGE_LOCK_ASSERT(sc);
/*
* If vlan is zero then we want to delete for all vlans so the lookup
* may return more than one.
*/
while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) {
bridge_rtnode_destroy(sc, brt);
found = 1;
}
return (found ? 0 : ENOENT);
}
/*
* bridge_rtdelete:
*
* Delete routes to a speicifc member interface.
*/
static void
bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full)
{
struct bridge_rtnode *brt, *nbrt;
BRIDGE_LOCK_ASSERT(sc);
LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) {
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 void
bridge_rtable_init(struct bridge_softc *sc)
{
int i;
sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE,
M_DEVBUF, M_WAITOK);
for (i = 0; i < BRIDGE_RTHASH_SIZE; i++)
LIST_INIT(&sc->sc_rthash[i]);
sc->sc_rthash_key = arc4random();
LIST_INIT(&sc->sc_rtlist);
}
/*
* bridge_rtable_fini:
*
* Deconstruct the route table for this bridge.
*/
static void
bridge_rtable_fini(struct bridge_softc *sc)
{
KASSERT(sc->sc_brtcnt == 0,
("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt));
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. Compare the
* vlan id or if zero then just return the first match.
*/
static struct bridge_rtnode *
bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan)
{
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 && (brt->brt_vlan == vlan || vlan == 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 && brt->brt_vlan == lbrt->brt_vlan)
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--;
brt->brt_dst->bif_addrcnt--;
uma_zfree(V_bridge_rtnode_zone, brt);
}
/*
* bridge_rtable_expire:
*
* Set the expiry time for all routes on an interface.
*/
static void
bridge_rtable_expire(struct ifnet *ifp, int age)
{
struct bridge_softc *sc = ifp->if_bridge;
struct bridge_rtnode *brt;
CURVNET_SET(ifp->if_vnet);
BRIDGE_LOCK(sc);
/*
* If the age is zero then flush, otherwise set all the expiry times to
* age for the interface
*/
if (age == 0)
bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN);
else {
LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) {
/* Cap the expiry time to 'age' */
if (brt->brt_ifp == ifp &&
brt->brt_expire > time_uptime + age &&
(brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)
brt->brt_expire = time_uptime + age;
}
}
BRIDGE_UNLOCK(sc);
CURVNET_RESTORE();
}
/*
* bridge_state_change:
*
* Callback from the bridgestp code when a port changes states.
*/
static void
bridge_state_change(struct ifnet *ifp, int state)
{
struct bridge_softc *sc = ifp->if_bridge;
static const char *stpstates[] = {
"disabled",
"listening",
"learning",
"forwarding",
"blocking",
"discarding"
};
CURVNET_SET(ifp->if_vnet);
if (V_log_stp)
log(LOG_NOTICE, "%s: state changed to %s on %s\n",
sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname);
CURVNET_RESTORE();
}
/*
* Send bridge packets through pfil if they are one of the types pfil can deal
* with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without
* question.) If *bifp or *ifp are NULL then packet filtering is skipped for
* that interface.
*/
static int
bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir)
{
int snap, error, i, hlen;
struct ether_header *eh1, eh2;
struct ip *ip;
struct llc llc1;
u_int16_t ether_type;
pfil_return_t rv;
snap = 0;
error = -1; /* Default error if not error == 0 */
#if 0
/* we may return with the IP fields swapped, ensure its not shared */
KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__));
#endif
if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_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:
if (V_pfil_ipfw_arp == 0)
return (0); /* Automatically pass */
break;
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 (V_pfil_onlyip)
goto bad;
}
/* Run the packet through pfil before stripping link headers */
if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 &&
dir == PFIL_OUT && ifp != NULL) {
switch (pfil_run_hooks(V_link_pfil_head, mp, ifp, dir, NULL)) {
case PFIL_DROPPED:
return (EPERM);
case PFIL_CONSUMED:
return (0);
}
}
/* 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;
}
error = 0;
/*
* Run the packet through pfil
*/
rv = PFIL_PASS;
switch (ether_type) {
case ETHERTYPE_IP:
/*
* 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 (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
PFIL_PASS)
break;
if (V_pfil_member && ifp != NULL && (rv =
pfil_run_hooks(V_inet_pfil_head, mp, ifp, dir, NULL)) !=
PFIL_PASS)
break;
if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
pfil_run_hooks(V_inet_pfil_head, mp, bifp, dir, NULL)) !=
PFIL_PASS)
break;
/* check if we need to fragment the packet */
/* bridge_fragment generates a mbuf chain of packets */
/* that already include eth headers */
if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) {
i = (*mp)->m_pkthdr.len;
if (i > ifp->if_mtu) {
error = bridge_fragment(ifp, mp, &eh2, snap,
&llc1);
return (error);
}
}
/* Recalculate the ip checksum. */
ip = mtod(*mp, struct ip *);
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip))
goto bad;
if (hlen > (*mp)->m_len) {
if ((*mp = m_pullup(*mp, hlen)) == NULL)
goto bad;
ip = mtod(*mp, struct ip *);
if (ip == NULL)
goto bad;
}
ip->ip_sum = 0;
if (hlen == sizeof(struct ip))
ip->ip_sum = in_cksum_hdr(ip);
else
ip->ip_sum = in_cksum(*mp, hlen);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv =
pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
PFIL_PASS)
break;
if (V_pfil_member && ifp != NULL && (rv =
pfil_run_hooks(V_inet6_pfil_head, mp, ifp, dir, NULL)) !=
PFIL_PASS)
break;
if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv =
pfil_run_hooks(V_inet6_pfil_head, mp, bifp, dir, NULL)) !=
PFIL_PASS)
break;
break;
#endif
}
switch (rv) {
case PFIL_CONSUMED:
return (0);
case PFIL_DROPPED:
return (EPERM);
default:
break;
}
error = -1;
/*
* Finally, put everything back the way it was and return
*/
if (snap) {
M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT);
if (*mp == NULL)
return (error);
bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc));
}
M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT);
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 */
KMOD_IPSTAT_INC(ips_toosmall);
goto bad;
}
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
KMOD_IPSTAT_INC(ips_toosmall);
goto bad;
}
}
ip = mtod(m, struct ip *);
if (ip == NULL) goto bad;
if (ip->ip_v != IPVERSION) {
KMOD_IPSTAT_INC(ips_badvers);
goto bad;
}
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) { /* minimum header length */
KMOD_IPSTAT_INC(ips_badhlen);
goto bad;
}
if (hlen > m->m_len) {
if ((m = m_pullup(m, hlen)) == NULL) {
KMOD_IPSTAT_INC(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) {
KMOD_IPSTAT_INC(ips_badsum);
goto bad;
}
/* Retrieve the packet length. */
len = ntohs(ip->ip_len);
/*
* Check for additional length bogosity
*/
if (len < hlen) {
KMOD_IPSTAT_INC(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) {
KMOD_IPSTAT_INC(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_INC(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_INC(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_INC(ip6s_badvers);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
/* Checks out, proceed */
*mp = m;
return (0);
bad:
*mp = m;
return (-1);
}
#endif /* INET6 */
/*
* bridge_fragment:
*
* Fragment mbuf chain in multiple packets and prepend ethernet header.
*/
static int
bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh,
int snap, struct llc *llc)
{
struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL;
struct ip *ip;
int error = -1;
if (m->m_len < sizeof(struct ip) &&
(m = m_pullup(m, sizeof(struct ip))) == NULL)
goto dropit;
ip = mtod(m, struct ip *);
m->m_pkthdr.csum_flags |= CSUM_IP;
error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist);
if (error)
goto dropit;
/*
* Walk the chain and re-add the Ethernet header for
* each mbuf packet.
*/
for (mcur = m; mcur; mcur = mcur->m_nextpkt) {
nextpkt = mcur->m_nextpkt;
mcur->m_nextpkt = NULL;
if (snap) {
M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT);
if (mcur == NULL) {
error = ENOBUFS;
if (mprev != NULL)
mprev->m_nextpkt = nextpkt;
goto dropit;
}
bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc));
}
M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT);
if (mcur == NULL) {
error = ENOBUFS;
if (mprev != NULL)
mprev->m_nextpkt = nextpkt;
goto dropit;
}
bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN);
/*
* The previous two M_PREPEND could have inserted one or two
* mbufs in front so we have to update the previous packet's
* m_nextpkt.
*/
mcur->m_nextpkt = nextpkt;
if (mprev != NULL)
mprev->m_nextpkt = mcur;
else {
/* The first mbuf in the original chain needs to be
* updated. */
*mp = mcur;
}
mprev = mcur;
}
KMOD_IPSTAT_INC(ips_fragmented);
return (error);
dropit:
for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */
m = mcur->m_nextpkt;
m_freem(mcur);
}
return (error);
}
static void
bridge_linkstate(struct ifnet *ifp)
{
struct bridge_softc *sc = ifp->if_bridge;
struct bridge_iflist *bif;
BRIDGE_LOCK(sc);
bif = bridge_lookup_member_if(sc, ifp);
if (bif == NULL) {
BRIDGE_UNLOCK(sc);
return;
}
bridge_linkcheck(sc);
BRIDGE_UNLOCK(sc);
bstp_linkstate(&bif->bif_stp);
}
static void
bridge_linkcheck(struct bridge_softc *sc)
{
struct bridge_iflist *bif;
int new_link, hasls;
BRIDGE_LOCK_ASSERT(sc);
new_link = LINK_STATE_DOWN;
hasls = 0;
/* Our link is considered up if at least one of our ports is active */
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE)
hasls++;
if (bif->bif_ifp->if_link_state == LINK_STATE_UP) {
new_link = LINK_STATE_UP;
break;
}
}
if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) {
/* If no interfaces support link-state then we default to up */
new_link = LINK_STATE_UP;
}
if_link_state_change(sc->sc_ifp, new_link);
}
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