Move files to match FreeBSD layout

1 files changed, 2250 insertions, 0 deletions

diff --git a/freebsd/sys/net/bridgestp.c b/freebsd/sys/net/bridgestp.c
new file mode 100644
index 00000000..2191be26
--- /dev/null
+++ b/freebsd/sys/net/bridgestp.c
@@ -0,0 +1,2250 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*	$NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $	*/
+
+/*
+ * Copyright (c) 2000 Jason L. Wright (jason@thought.net)
+ * Copyright (c) 2006 Andrew Thompson (thompsa@FreeBSD.org)
+ * 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: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp
+ */
+
+/*
+ * Implementation of the spanning tree protocol as defined in
+ * ISO/IEC 802.1D-2004, June 9, 2004.
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/mbuf.h>
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/sockio.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/callout.h>
+#include <freebsd/sys/module.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/lock.h>
+#include <freebsd/sys/mutex.h>
+#include <freebsd/sys/taskqueue.h>
+
+#include <freebsd/net/if.h>
+#include <freebsd/net/if_dl.h>
+#include <freebsd/net/if_types.h>
+#include <freebsd/net/if_llc.h>
+#include <freebsd/net/if_media.h>
+#include <freebsd/net/vnet.h>
+
+#include <freebsd/netinet/in.h>
+#include <freebsd/netinet/in_systm.h>
+#include <freebsd/netinet/in_var.h>
+#include <freebsd/netinet/if_ether.h>
+#include <freebsd/net/bridgestp.h>
+
+#ifdef	BRIDGESTP_DEBUG
+#define	DPRINTF(fmt, arg...)	printf("bstp: " fmt, ##arg)
+#else
+#define	DPRINTF(fmt, arg...)	(void)0
+#endif
+
+#define	PV2ADDR(pv, eaddr)	do {		\
+	eaddr[0] = pv >> 40;			\
+	eaddr[1] = pv >> 32;			\
+	eaddr[2] = pv >> 24;			\
+	eaddr[3] = pv >> 16;			\
+	eaddr[4] = pv >> 8;			\
+	eaddr[5] = pv >> 0;			\
+} while (0)
+
+#define	INFO_BETTER	1
+#define	INFO_SAME	0
+#define	INFO_WORSE	-1
+
+const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+LIST_HEAD(, bstp_state) bstp_list;
+static struct mtx	bstp_list_mtx;
+
+static void	bstp_transmit(struct bstp_state *, struct bstp_port *);
+static void	bstp_transmit_bpdu(struct bstp_state *, struct bstp_port *);
+static void	bstp_transmit_tcn(struct bstp_state *, struct bstp_port *);
+static void	bstp_decode_bpdu(struct bstp_port *, struct bstp_cbpdu *,
+		    struct bstp_config_unit *);
+static void	bstp_send_bpdu(struct bstp_state *, struct bstp_port *,
+		    struct bstp_cbpdu *);
+static int	bstp_pdu_flags(struct bstp_port *);
+static void	bstp_received_stp(struct bstp_state *, struct bstp_port *,
+		    struct mbuf **, struct bstp_tbpdu *);
+static void	bstp_received_rstp(struct bstp_state *, struct bstp_port *,
+		    struct mbuf **, struct bstp_tbpdu *);
+static void	bstp_received_tcn(struct bstp_state *, struct bstp_port *,
+		    struct bstp_tcn_unit *);
+static void	bstp_received_bpdu(struct bstp_state *, struct bstp_port *,
+		    struct bstp_config_unit *);
+static int	bstp_pdu_rcvtype(struct bstp_port *, struct bstp_config_unit *);
+static int	bstp_pdu_bettersame(struct bstp_port *, int);
+static int	bstp_info_cmp(struct bstp_pri_vector *,
+		    struct bstp_pri_vector *);
+static int	bstp_info_superior(struct bstp_pri_vector *,
+		    struct bstp_pri_vector *);
+static void	bstp_assign_roles(struct bstp_state *);
+static void	bstp_update_roles(struct bstp_state *, struct bstp_port *);
+static void	bstp_update_state(struct bstp_state *, struct bstp_port *);
+static void	bstp_update_tc(struct bstp_port *);
+static void	bstp_update_info(struct bstp_port *);
+static void	bstp_set_other_tcprop(struct bstp_port *);
+static void	bstp_set_all_reroot(struct bstp_state *);
+static void	bstp_set_all_sync(struct bstp_state *);
+static void	bstp_set_port_state(struct bstp_port *, int);
+static void	bstp_set_port_role(struct bstp_port *, int);
+static void	bstp_set_port_proto(struct bstp_port *, int);
+static void	bstp_set_port_tc(struct bstp_port *, int);
+static void	bstp_set_timer_tc(struct bstp_port *);
+static void	bstp_set_timer_msgage(struct bstp_port *);
+static int	bstp_rerooted(struct bstp_state *, struct bstp_port *);
+static uint32_t	bstp_calc_path_cost(struct bstp_port *);
+static void	bstp_notify_state(void *, int);
+static void	bstp_notify_rtage(void *, int);
+static void	bstp_ifupdstatus(struct bstp_state *, struct bstp_port *);
+static void	bstp_enable_port(struct bstp_state *, struct bstp_port *);
+static void	bstp_disable_port(struct bstp_state *, struct bstp_port *);
+static void	bstp_tick(void *);
+static void	bstp_timer_start(struct bstp_timer *, uint16_t);
+static void	bstp_timer_stop(struct bstp_timer *);
+static void	bstp_timer_latch(struct bstp_timer *);
+static int	bstp_timer_expired(struct bstp_timer *);
+static void	bstp_hello_timer_expiry(struct bstp_state *,
+		    struct bstp_port *);
+static void	bstp_message_age_expiry(struct bstp_state *,
+		    struct bstp_port *);
+static void	bstp_migrate_delay_expiry(struct bstp_state *,
+		    struct bstp_port *);
+static void	bstp_edge_delay_expiry(struct bstp_state *,
+		    struct bstp_port *);
+static int	bstp_addr_cmp(const uint8_t *, const uint8_t *);
+static int	bstp_same_bridgeid(uint64_t, uint64_t);
+static void	bstp_reinit(struct bstp_state *);
+
+static void
+bstp_transmit(struct bstp_state *bs, struct bstp_port *bp)
+{
+	if (bs->bs_running == 0)
+		return;
+
+	/*
+	 * a PDU can only be sent if we have tx quota left and the
+	 * hello timer is running.
+	 */
+	if (bp->bp_hello_timer.active == 0) {
+		/* Test if it needs to be reset */
+		bstp_hello_timer_expiry(bs, bp);
+		return;
+	}
+	if (bp->bp_txcount > bs->bs_txholdcount)
+		/* Ran out of karma */
+		return;
+
+	if (bp->bp_protover == BSTP_PROTO_RSTP) {
+		bstp_transmit_bpdu(bs, bp);
+		bp->bp_tc_ack = 0;
+	} else { /* STP */
+		switch (bp->bp_role) {
+			case BSTP_ROLE_DESIGNATED:
+				bstp_transmit_bpdu(bs, bp);
+				bp->bp_tc_ack = 0;
+				break;
+
+			case BSTP_ROLE_ROOT:
+				bstp_transmit_tcn(bs, bp);
+				break;
+		}
+	}
+	bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
+	bp->bp_flags &= ~BSTP_PORT_NEWINFO;
+}
+
+static void
+bstp_transmit_bpdu(struct bstp_state *bs, struct bstp_port *bp)
+{
+	struct bstp_cbpdu bpdu;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	bpdu.cbu_rootpri = htons(bp->bp_desg_pv.pv_root_id >> 48);
+	PV2ADDR(bp->bp_desg_pv.pv_root_id, bpdu.cbu_rootaddr);
+
+	bpdu.cbu_rootpathcost = htonl(bp->bp_desg_pv.pv_cost);
+
+	bpdu.cbu_bridgepri = htons(bp->bp_desg_pv.pv_dbridge_id >> 48);
+	PV2ADDR(bp->bp_desg_pv.pv_dbridge_id, bpdu.cbu_bridgeaddr);
+
+	bpdu.cbu_portid = htons(bp->bp_port_id);
+	bpdu.cbu_messageage = htons(bp->bp_desg_msg_age);
+	bpdu.cbu_maxage = htons(bp->bp_desg_max_age);
+	bpdu.cbu_hellotime = htons(bp->bp_desg_htime);
+	bpdu.cbu_forwarddelay = htons(bp->bp_desg_fdelay);
+
+	bpdu.cbu_flags = bstp_pdu_flags(bp);
+
+	switch (bp->bp_protover) {
+		case BSTP_PROTO_STP:
+			bpdu.cbu_bpdutype = BSTP_MSGTYPE_CFG;
+			break;
+
+		case BSTP_PROTO_RSTP:
+			bpdu.cbu_bpdutype = BSTP_MSGTYPE_RSTP;
+			break;
+	}
+
+	bstp_send_bpdu(bs, bp, &bpdu);
+}
+
+static void
+bstp_transmit_tcn(struct bstp_state *bs, struct bstp_port *bp)
+{
+	struct bstp_tbpdu bpdu;
+	struct ifnet *ifp = bp->bp_ifp;
+	struct ether_header *eh;
+	struct mbuf *m;
+
+	KASSERT(bp == bs->bs_root_port, ("%s: bad root port\n", __func__));
+
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
+		return;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == NULL)
+		return;
+
+	m->m_pkthdr.rcvif = ifp;
+	m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
+	m->m_len = m->m_pkthdr.len;
+
+	eh = mtod(m, struct ether_header *);
+
+	memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
+	memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
+	eh->ether_type = htons(sizeof(bpdu));
+
+	bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
+	bpdu.tbu_ctl = LLC_UI;
+	bpdu.tbu_protoid = 0;
+	bpdu.tbu_protover = 0;
+	bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
+
+	memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
+
+	bp->bp_txcount++;
+	ifp->if_transmit(ifp, m);
+}
+
+static void
+bstp_decode_bpdu(struct bstp_port *bp, struct bstp_cbpdu *cpdu,
+    struct bstp_config_unit *cu)
+{
+	int flags;
+
+	cu->cu_pv.pv_root_id =
+	    (((uint64_t)ntohs(cpdu->cbu_rootpri)) << 48) |
+	    (((uint64_t)cpdu->cbu_rootaddr[0]) << 40) |
+	    (((uint64_t)cpdu->cbu_rootaddr[1]) << 32) |
+	    (((uint64_t)cpdu->cbu_rootaddr[2]) << 24) |
+	    (((uint64_t)cpdu->cbu_rootaddr[3]) << 16) |
+	    (((uint64_t)cpdu->cbu_rootaddr[4]) << 8) |
+	    (((uint64_t)cpdu->cbu_rootaddr[5]) << 0);
+
+	cu->cu_pv.pv_dbridge_id =
+	    (((uint64_t)ntohs(cpdu->cbu_bridgepri)) << 48) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[0]) << 40) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[1]) << 32) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[2]) << 24) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[3]) << 16) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[4]) << 8) |
+	    (((uint64_t)cpdu->cbu_bridgeaddr[5]) << 0);
+
+	cu->cu_pv.pv_cost = ntohl(cpdu->cbu_rootpathcost);
+	cu->cu_message_age = ntohs(cpdu->cbu_messageage);
+	cu->cu_max_age = ntohs(cpdu->cbu_maxage);
+	cu->cu_hello_time = ntohs(cpdu->cbu_hellotime);
+	cu->cu_forward_delay = ntohs(cpdu->cbu_forwarddelay);
+	cu->cu_pv.pv_dport_id = ntohs(cpdu->cbu_portid);
+	cu->cu_pv.pv_port_id = bp->bp_port_id;
+	cu->cu_message_type = cpdu->cbu_bpdutype;
+
+	/* Strip off unused flags in STP mode */
+	flags = cpdu->cbu_flags;
+	switch (cpdu->cbu_protover) {
+		case BSTP_PROTO_STP:
+			flags &= BSTP_PDU_STPMASK;
+			/* A STP BPDU explicitly conveys a Designated Port */
+			cu->cu_role = BSTP_ROLE_DESIGNATED;
+			break;
+
+		case BSTP_PROTO_RSTP:
+			flags &= BSTP_PDU_RSTPMASK;
+			break;
+	}
+
+	cu->cu_topology_change_ack =
+		(flags & BSTP_PDU_F_TCA) ? 1 : 0;
+	cu->cu_proposal =
+		(flags & BSTP_PDU_F_P) ? 1 : 0;
+	cu->cu_agree =
+		(flags & BSTP_PDU_F_A) ? 1 : 0;
+	cu->cu_learning =
+		(flags & BSTP_PDU_F_L) ? 1 : 0;
+	cu->cu_forwarding =
+		(flags & BSTP_PDU_F_F) ? 1 : 0;
+	cu->cu_topology_change =
+		(flags & BSTP_PDU_F_TC) ? 1 : 0;
+
+	switch ((flags & BSTP_PDU_PRMASK) >> BSTP_PDU_PRSHIFT) {
+		case BSTP_PDU_F_ROOT:
+			cu->cu_role = BSTP_ROLE_ROOT;
+			break;
+		case BSTP_PDU_F_ALT:
+			cu->cu_role = BSTP_ROLE_ALTERNATE;
+			break;
+		case BSTP_PDU_F_DESG:
+			cu->cu_role = BSTP_ROLE_DESIGNATED;
+			break;
+	}
+}
+
+static void
+bstp_send_bpdu(struct bstp_state *bs, struct bstp_port *bp,
+    struct bstp_cbpdu *bpdu)
+{
+	struct ifnet *ifp;
+	struct mbuf *m;
+	struct ether_header *eh;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	ifp = bp->bp_ifp;
+
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
+		return;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == NULL)
+		return;
+
+	eh = mtod(m, struct ether_header *);
+
+	bpdu->cbu_ssap = bpdu->cbu_dsap = LLC_8021D_LSAP;
+	bpdu->cbu_ctl = LLC_UI;
+	bpdu->cbu_protoid = htons(BSTP_PROTO_ID);
+
+	memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
+	memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
+
+	switch (bpdu->cbu_bpdutype) {
+		case BSTP_MSGTYPE_CFG:
+			bpdu->cbu_protover = BSTP_PROTO_STP;
+			m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_STP_LEN;
+			eh->ether_type = htons(BSTP_BPDU_STP_LEN);
+			memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
+			    BSTP_BPDU_STP_LEN);
+			break;
+
+		case BSTP_MSGTYPE_RSTP:
+			bpdu->cbu_protover = BSTP_PROTO_RSTP;
+			bpdu->cbu_versionlen = htons(0);
+			m->m_pkthdr.len = sizeof(*eh) + BSTP_BPDU_RSTP_LEN;
+			eh->ether_type = htons(BSTP_BPDU_RSTP_LEN);
+			memcpy(mtod(m, caddr_t) + sizeof(*eh), bpdu,
+			    BSTP_BPDU_RSTP_LEN);
+			break;
+
+		default:
+			panic("not implemented");
+	}
+	m->m_pkthdr.rcvif = ifp;
+	m->m_len = m->m_pkthdr.len;
+
+	bp->bp_txcount++;
+	ifp->if_transmit(ifp, m);
+}
+
+static int
+bstp_pdu_flags(struct bstp_port *bp)
+{
+	int flags = 0;
+
+	if (bp->bp_proposing && bp->bp_state != BSTP_IFSTATE_FORWARDING)
+		flags |= BSTP_PDU_F_P;
+
+	if (bp->bp_agree)
+		flags |= BSTP_PDU_F_A;
+
+	if (bp->bp_tc_timer.active)
+		flags |= BSTP_PDU_F_TC;
+
+	if (bp->bp_tc_ack)
+		flags |= BSTP_PDU_F_TCA;
+
+	switch (bp->bp_state) {
+		case BSTP_IFSTATE_LEARNING:
+			flags |= BSTP_PDU_F_L;
+			break;
+
+		case BSTP_IFSTATE_FORWARDING:
+			flags |= (BSTP_PDU_F_L | BSTP_PDU_F_F);
+			break;
+	}
+
+	switch (bp->bp_role) {
+		case BSTP_ROLE_ROOT:
+			flags |=
+				(BSTP_PDU_F_ROOT << BSTP_PDU_PRSHIFT);
+			break;
+
+		case BSTP_ROLE_ALTERNATE:
+		case BSTP_ROLE_BACKUP:	/* fall through */
+			flags |=
+				(BSTP_PDU_F_ALT << BSTP_PDU_PRSHIFT);
+			break;
+
+		case BSTP_ROLE_DESIGNATED:
+			flags |=
+				(BSTP_PDU_F_DESG << BSTP_PDU_PRSHIFT);
+			break;
+	}
+
+	/* Strip off unused flags in either mode */
+	switch (bp->bp_protover) {
+		case BSTP_PROTO_STP:
+			flags &= BSTP_PDU_STPMASK;
+			break;
+		case BSTP_PROTO_RSTP:
+			flags &= BSTP_PDU_RSTPMASK;
+			break;
+	}
+	return (flags);
+}
+
+struct mbuf *
+bstp_input(struct bstp_port *bp, struct ifnet *ifp, struct mbuf *m)
+{
+	struct bstp_state *bs = bp->bp_bs;
+	struct ether_header *eh;
+	struct bstp_tbpdu tpdu;
+	uint16_t len;
+
+	if (bp->bp_active == 0) {
+		m_freem(m);
+		return (NULL);
+	}
+
+	BSTP_LOCK(bs);
+
+	eh = mtod(m, struct ether_header *);
+
+	len = ntohs(eh->ether_type);
+	if (len < sizeof(tpdu))
+		goto out;
+
+	m_adj(m, ETHER_HDR_LEN);
+
+	if (m->m_pkthdr.len > len)
+		m_adj(m, len - m->m_pkthdr.len);
+	if (m->m_len < sizeof(tpdu) &&
+	    (m = m_pullup(m, sizeof(tpdu))) == NULL)
+		goto out;
+
+	memcpy(&tpdu, mtod(m, caddr_t), sizeof(tpdu));
+
+	/* basic packet checks */
+	if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
+	    tpdu.tbu_ssap != LLC_8021D_LSAP ||
+	    tpdu.tbu_ctl != LLC_UI)
+		goto out;
+	if (tpdu.tbu_protoid != BSTP_PROTO_ID)
+		goto out;
+
+	/*
+	 * We can treat later versions of the PDU as the same as the maximum
+	 * version we implement. All additional parameters/flags are ignored.
+	 */
+	if (tpdu.tbu_protover > BSTP_PROTO_MAX)
+		tpdu.tbu_protover = BSTP_PROTO_MAX;
+
+	if (tpdu.tbu_protover != bp->bp_protover) {
+		/*
+		 * Wait for the migration delay timer to expire before changing
+		 * protocol version to avoid flip-flops.
+		 */
+		if (bp->bp_flags & BSTP_PORT_CANMIGRATE)
+			bstp_set_port_proto(bp, tpdu.tbu_protover);
+		else
+			goto out;
+	}
+
+	/* Clear operedge upon receiving a PDU on the port */
+	bp->bp_operedge = 0;
+	bstp_timer_start(&bp->bp_edge_delay_timer,
+	    BSTP_DEFAULT_MIGRATE_DELAY);
+
+	switch (tpdu.tbu_protover) {
+		case BSTP_PROTO_STP:
+			bstp_received_stp(bs, bp, &m, &tpdu);
+			break;
+
+		case BSTP_PROTO_RSTP:
+			bstp_received_rstp(bs, bp, &m, &tpdu);
+			break;
+	}
+out:
+	BSTP_UNLOCK(bs);
+	if (m)
+		m_freem(m);
+	return (NULL);
+}
+
+static void
+bstp_received_stp(struct bstp_state *bs, struct bstp_port *bp,
+    struct mbuf **mp, struct bstp_tbpdu *tpdu)
+{
+	struct bstp_cbpdu cpdu;
+	struct bstp_config_unit *cu = &bp->bp_msg_cu;
+	struct bstp_tcn_unit tu;
+
+	switch (tpdu->tbu_bpdutype) {
+	case BSTP_MSGTYPE_TCN:
+		tu.tu_message_type = tpdu->tbu_bpdutype;
+		bstp_received_tcn(bs, bp, &tu);
+		break;
+	case BSTP_MSGTYPE_CFG:
+		if ((*mp)->m_len < BSTP_BPDU_STP_LEN &&
+		    (*mp = m_pullup(*mp, BSTP_BPDU_STP_LEN)) == NULL)
+			return;
+		memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_STP_LEN);
+
+		bstp_decode_bpdu(bp, &cpdu, cu);
+		bstp_received_bpdu(bs, bp, cu);
+		break;
+	}
+}
+
+static void
+bstp_received_rstp(struct bstp_state *bs, struct bstp_port *bp,
+    struct mbuf **mp, struct bstp_tbpdu *tpdu)
+{
+	struct bstp_cbpdu cpdu;
+	struct bstp_config_unit *cu = &bp->bp_msg_cu;
+
+	if (tpdu->tbu_bpdutype != BSTP_MSGTYPE_RSTP)
+		return;
+
+	if ((*mp)->m_len < BSTP_BPDU_RSTP_LEN &&
+	    (*mp = m_pullup(*mp, BSTP_BPDU_RSTP_LEN)) == NULL)
+		return;
+	memcpy(&cpdu, mtod(*mp, caddr_t), BSTP_BPDU_RSTP_LEN);
+
+	bstp_decode_bpdu(bp, &cpdu, cu);
+	bstp_received_bpdu(bs, bp, cu);
+}
+
+static void
+bstp_received_tcn(struct bstp_state *bs, struct bstp_port *bp,
+    struct bstp_tcn_unit *tcn)
+{
+	bp->bp_rcvdtcn = 1;
+	bstp_update_tc(bp);
+}
+
+static void
+bstp_received_bpdu(struct bstp_state *bs, struct bstp_port *bp,
+    struct bstp_config_unit *cu)
+{
+	int type;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	/* We need to have transitioned to INFO_MINE before proceeding */
+	switch (bp->bp_infois) {
+		case BSTP_INFO_DISABLED:
+		case BSTP_INFO_AGED:
+			return;
+	}
+
+	type = bstp_pdu_rcvtype(bp, cu);
+
+	switch (type) {
+		case BSTP_PDU_SUPERIOR:
+			bs->bs_allsynced = 0;
+			bp->bp_agreed = 0;
+			bp->bp_proposing = 0;
+
+			if (cu->cu_proposal && cu->cu_forwarding == 0)
+				bp->bp_proposed = 1;
+			if (cu->cu_topology_change)
+				bp->bp_rcvdtc = 1;
+			if (cu->cu_topology_change_ack)
+				bp->bp_rcvdtca = 1;
+
+			if (bp->bp_agree &&
+			    !bstp_pdu_bettersame(bp, BSTP_INFO_RECEIVED))
+				bp->bp_agree = 0;
+
+			/* copy the received priority and timers to the port */
+			bp->bp_port_pv = cu->cu_pv;
+			bp->bp_port_msg_age = cu->cu_message_age;
+			bp->bp_port_max_age = cu->cu_max_age;
+			bp->bp_port_fdelay = cu->cu_forward_delay;
+			bp->bp_port_htime =
+				(cu->cu_hello_time > BSTP_MIN_HELLO_TIME ?
+				 cu->cu_hello_time : BSTP_MIN_HELLO_TIME);
+
+			/* set expiry for the new info */
+			bstp_set_timer_msgage(bp);
+
+			bp->bp_infois = BSTP_INFO_RECEIVED;
+			bstp_assign_roles(bs);
+			break;
+
+		case BSTP_PDU_REPEATED:
+			if (cu->cu_proposal && cu->cu_forwarding == 0)
+				bp->bp_proposed = 1;
+			if (cu->cu_topology_change)
+				bp->bp_rcvdtc = 1;
+			if (cu->cu_topology_change_ack)
+				bp->bp_rcvdtca = 1;
+
+			/* rearm the age timer */
+			bstp_set_timer_msgage(bp);
+			break;
+
+		case BSTP_PDU_INFERIOR:
+			if (cu->cu_learning) {
+				bp->bp_agreed = 1;
+				bp->bp_proposing = 0;
+			}
+			break;
+
+		case BSTP_PDU_INFERIORALT:
+			/*
+			 * only point to point links are allowed fast
+			 * transitions to forwarding.
+			 */
+			if (cu->cu_agree && bp->bp_ptp_link) {
+				bp->bp_agreed = 1;
+				bp->bp_proposing = 0;
+			} else
+				bp->bp_agreed = 0;
+
+			if (cu->cu_topology_change)
+				bp->bp_rcvdtc = 1;
+			if (cu->cu_topology_change_ack)
+				bp->bp_rcvdtca = 1;
+			break;
+
+		case BSTP_PDU_OTHER:
+			return;	/* do nothing */
+	}
+	/* update the state machines with the new data */
+	bstp_update_state(bs, bp);
+}
+
+static int
+bstp_pdu_rcvtype(struct bstp_port *bp, struct bstp_config_unit *cu)
+{
+	int type;
+
+	/* default return type */
+	type = BSTP_PDU_OTHER;
+
+	switch (cu->cu_role) {
+	case BSTP_ROLE_DESIGNATED:
+		if (bstp_info_superior(&bp->bp_port_pv, &cu->cu_pv))
+			/* bpdu priority is superior */
+			type = BSTP_PDU_SUPERIOR;
+		else if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) ==
+		    INFO_SAME) {
+			if (bp->bp_port_msg_age != cu->cu_message_age ||
+			    bp->bp_port_max_age != cu->cu_max_age ||
+			    bp->bp_port_fdelay != cu->cu_forward_delay ||
+			    bp->bp_port_htime != cu->cu_hello_time)
+				/* bpdu priority is equal and timers differ */
+				type = BSTP_PDU_SUPERIOR;
+			else
+				/* bpdu is equal */
+				type = BSTP_PDU_REPEATED;
+		} else
+			/* bpdu priority is worse */
+			type = BSTP_PDU_INFERIOR;
+
+		break;
+
+	case BSTP_ROLE_ROOT:
+	case BSTP_ROLE_ALTERNATE:
+	case BSTP_ROLE_BACKUP:
+		if (bstp_info_cmp(&bp->bp_port_pv, &cu->cu_pv) <= INFO_SAME)
+			/*
+			 * not a designated port and priority is the same or
+			 * worse
+			 */
+			type = BSTP_PDU_INFERIORALT;
+		break;
+	}
+
+	return (type);
+}
+
+static int
+bstp_pdu_bettersame(struct bstp_port *bp, int newinfo)
+{
+	if (newinfo == BSTP_INFO_RECEIVED &&
+	    bp->bp_infois == BSTP_INFO_RECEIVED &&
+	    bstp_info_cmp(&bp->bp_port_pv, &bp->bp_msg_cu.cu_pv) >= INFO_SAME)
+		return (1);
+
+	if (newinfo == BSTP_INFO_MINE &&
+	    bp->bp_infois == BSTP_INFO_MINE &&
+	    bstp_info_cmp(&bp->bp_port_pv, &bp->bp_desg_pv) >= INFO_SAME)
+		return (1);
+
+	return (0);
+}
+
+static int
+bstp_info_cmp(struct bstp_pri_vector *pv,
+    struct bstp_pri_vector *cpv)
+{
+	if (cpv->pv_root_id < pv->pv_root_id)
+		return (INFO_BETTER);
+	if (cpv->pv_root_id > pv->pv_root_id)
+		return (INFO_WORSE);
+
+	if (cpv->pv_cost < pv->pv_cost)
+		return (INFO_BETTER);
+	if (cpv->pv_cost > pv->pv_cost)
+		return (INFO_WORSE);
+
+	if (cpv->pv_dbridge_id < pv->pv_dbridge_id)
+		return (INFO_BETTER);
+	if (cpv->pv_dbridge_id > pv->pv_dbridge_id)
+		return (INFO_WORSE);
+
+	if (cpv->pv_dport_id < pv->pv_dport_id)
+		return (INFO_BETTER);
+	if (cpv->pv_dport_id > pv->pv_dport_id)
+		return (INFO_WORSE);
+
+	return (INFO_SAME);
+}
+
+/*
+ * This message priority vector is superior to the port priority vector and
+ * will replace it if, and only if, the message priority vector is better than
+ * the port priority vector, or the message has been transmitted from the same
+ * designated bridge and designated port as the port priority vector.
+ */
+static int
+bstp_info_superior(struct bstp_pri_vector *pv,
+    struct bstp_pri_vector *cpv)
+{
+	if (bstp_info_cmp(pv, cpv) == INFO_BETTER ||
+	    (bstp_same_bridgeid(pv->pv_dbridge_id, cpv->pv_dbridge_id) &&
+	    (cpv->pv_dport_id & 0xfff) == (pv->pv_dport_id & 0xfff)))
+		return (1);
+	return (0);
+}
+
+static void
+bstp_assign_roles(struct bstp_state *bs)
+{
+	struct bstp_port *bp, *rbp = NULL;
+	struct bstp_pri_vector pv;
+
+	/* default to our priority vector */
+	bs->bs_root_pv = bs->bs_bridge_pv;
+	bs->bs_root_msg_age = 0;
+	bs->bs_root_max_age = bs->bs_bridge_max_age;
+	bs->bs_root_fdelay = bs->bs_bridge_fdelay;
+	bs->bs_root_htime = bs->bs_bridge_htime;
+	bs->bs_root_port = NULL;
+
+	/* check if any recieved info supersedes us */
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		if (bp->bp_infois != BSTP_INFO_RECEIVED)
+			continue;
+
+		pv = bp->bp_port_pv;
+		pv.pv_cost += bp->bp_path_cost;
+
+		/*
+		 * The root priority vector is the best of the set comprising
+		 * the bridge priority vector plus all root path priority
+		 * vectors whose bridge address is not equal to us.
+		 */
+		if (bstp_same_bridgeid(pv.pv_dbridge_id,
+		    bs->bs_bridge_pv.pv_dbridge_id) == 0 &&
+		    bstp_info_cmp(&bs->bs_root_pv, &pv) == INFO_BETTER) {
+			/* the port vector replaces the root */
+			bs->bs_root_pv = pv;
+			bs->bs_root_msg_age = bp->bp_port_msg_age +
+			    BSTP_MESSAGE_AGE_INCR;
+			bs->bs_root_max_age = bp->bp_port_max_age;
+			bs->bs_root_fdelay = bp->bp_port_fdelay;
+			bs->bs_root_htime = bp->bp_port_htime;
+			rbp = bp;
+		}
+	}
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		/* calculate the port designated vector */
+		bp->bp_desg_pv.pv_root_id = bs->bs_root_pv.pv_root_id;
+		bp->bp_desg_pv.pv_cost = bs->bs_root_pv.pv_cost;
+		bp->bp_desg_pv.pv_dbridge_id = bs->bs_bridge_pv.pv_dbridge_id;
+		bp->bp_desg_pv.pv_dport_id = bp->bp_port_id;
+		bp->bp_desg_pv.pv_port_id = bp->bp_port_id;
+
+		/* calculate designated times */
+		bp->bp_desg_msg_age = bs->bs_root_msg_age;
+		bp->bp_desg_max_age = bs->bs_root_max_age;
+		bp->bp_desg_fdelay = bs->bs_root_fdelay;
+		bp->bp_desg_htime = bs->bs_bridge_htime;
+
+
+		switch (bp->bp_infois) {
+		case BSTP_INFO_DISABLED:
+			bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
+			break;
+
+		case BSTP_INFO_AGED:
+			bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
+			bstp_update_info(bp);
+			break;
+
+		case BSTP_INFO_MINE:
+			bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
+			/* update the port info if stale */
+			if (bstp_info_cmp(&bp->bp_port_pv,
+			    &bp->bp_desg_pv) != INFO_SAME ||
+			    (rbp != NULL &&
+			    (bp->bp_port_msg_age != rbp->bp_port_msg_age ||
+			    bp->bp_port_max_age != rbp->bp_port_max_age ||
+			    bp->bp_port_fdelay != rbp->bp_port_fdelay ||
+			    bp->bp_port_htime != rbp->bp_port_htime)))
+				bstp_update_info(bp);
+			break;
+
+		case BSTP_INFO_RECEIVED:
+			if (bp == rbp) {
+				/*
+				 * root priority is derived from this
+				 * port, make it the root port.
+				 */
+				bstp_set_port_role(bp, BSTP_ROLE_ROOT);
+				bs->bs_root_port = bp;
+			} else if (bstp_info_cmp(&bp->bp_port_pv,
+				    &bp->bp_desg_pv) == INFO_BETTER) {
+				/*
+				 * the port priority is lower than the root
+				 * port.
+				 */
+				bstp_set_port_role(bp, BSTP_ROLE_DESIGNATED);
+				bstp_update_info(bp);
+			} else {
+				if (bstp_same_bridgeid(
+				    bp->bp_port_pv.pv_dbridge_id,
+				    bs->bs_bridge_pv.pv_dbridge_id)) {
+					/*
+					 * the designated bridge refers to
+					 * another port on this bridge.
+					 */
+					bstp_set_port_role(bp,
+					    BSTP_ROLE_BACKUP);
+				} else {
+					/*
+					 * the port is an inferior path to the
+					 * root bridge.
+					 */
+					bstp_set_port_role(bp,
+					    BSTP_ROLE_ALTERNATE);
+				}
+			}
+			break;
+		}
+	}
+}
+
+static void
+bstp_update_state(struct bstp_state *bs, struct bstp_port *bp)
+{
+	struct bstp_port *bp2;
+	int synced;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	/* check if all the ports have syncronised again */
+	if (!bs->bs_allsynced) {
+		synced = 1;
+		LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
+			if (!(bp2->bp_synced ||
+			     bp2->bp_role == BSTP_ROLE_ROOT)) {
+				synced = 0;
+				break;
+			}
+		}
+		bs->bs_allsynced = synced;
+	}
+
+	bstp_update_roles(bs, bp);
+	bstp_update_tc(bp);
+}
+
+static void
+bstp_update_roles(struct bstp_state *bs, struct bstp_port *bp)
+{
+	switch (bp->bp_role) {
+	case BSTP_ROLE_DISABLED:
+		/* Clear any flags if set */
+		if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
+			bp->bp_sync = 0;
+			bp->bp_synced = 1;
+			bp->bp_reroot = 0;
+		}
+		break;
+
+	case BSTP_ROLE_ALTERNATE:
+	case BSTP_ROLE_BACKUP:
+		if ((bs->bs_allsynced && !bp->bp_agree) ||
+		    (bp->bp_proposed && bp->bp_agree)) {
+			bp->bp_proposed = 0;
+			bp->bp_agree = 1;
+			bp->bp_flags |= BSTP_PORT_NEWINFO;
+			DPRINTF("%s -> ALTERNATE_AGREED\n",
+			    bp->bp_ifp->if_xname);
+		}
+
+		if (bp->bp_proposed && !bp->bp_agree) {
+			bstp_set_all_sync(bs);
+			bp->bp_proposed = 0;
+			DPRINTF("%s -> ALTERNATE_PROPOSED\n",
+			    bp->bp_ifp->if_xname);
+		}
+
+		/* Clear any flags if set */
+		if (bp->bp_sync || !bp->bp_synced || bp->bp_reroot) {
+			bp->bp_sync = 0;
+			bp->bp_synced = 1;
+			bp->bp_reroot = 0;
+			DPRINTF("%s -> ALTERNATE_PORT\n", bp->bp_ifp->if_xname);
+		}
+		break;
+
+	case BSTP_ROLE_ROOT:
+		if (bp->bp_state != BSTP_IFSTATE_FORWARDING && !bp->bp_reroot) {
+			bstp_set_all_reroot(bs);
+			DPRINTF("%s -> ROOT_REROOT\n", bp->bp_ifp->if_xname);
+		}
+
+		if ((bs->bs_allsynced && !bp->bp_agree) ||
+		    (bp->bp_proposed && bp->bp_agree)) {
+			bp->bp_proposed = 0;
+			bp->bp_sync = 0;
+			bp->bp_agree = 1;
+			bp->bp_flags |= BSTP_PORT_NEWINFO;
+			DPRINTF("%s -> ROOT_AGREED\n", bp->bp_ifp->if_xname);
+		}
+
+		if (bp->bp_proposed && !bp->bp_agree) {
+			bstp_set_all_sync(bs);
+			bp->bp_proposed = 0;
+			DPRINTF("%s -> ROOT_PROPOSED\n", bp->bp_ifp->if_xname);
+		}
+
+		if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
+		    (bp->bp_forward_delay_timer.active == 0 ||
+		    (bstp_rerooted(bs, bp) &&
+		    bp->bp_recent_backup_timer.active == 0 &&
+		    bp->bp_protover == BSTP_PROTO_RSTP))) {
+			switch (bp->bp_state) {
+			case BSTP_IFSTATE_DISCARDING:
+				bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
+				break;
+			case BSTP_IFSTATE_LEARNING:
+				bstp_set_port_state(bp,
+				    BSTP_IFSTATE_FORWARDING);
+				break;
+			}
+		}
+
+		if (bp->bp_state == BSTP_IFSTATE_FORWARDING && bp->bp_reroot) {
+			bp->bp_reroot = 0;
+			DPRINTF("%s -> ROOT_REROOTED\n", bp->bp_ifp->if_xname);
+		}
+		break;
+
+	case BSTP_ROLE_DESIGNATED:
+		if (bp->bp_recent_root_timer.active == 0 && bp->bp_reroot) {
+			bp->bp_reroot = 0;
+			DPRINTF("%s -> DESIGNATED_RETIRED\n",
+			    bp->bp_ifp->if_xname);
+		}
+
+		if ((bp->bp_state == BSTP_IFSTATE_DISCARDING &&
+		    !bp->bp_synced) || (bp->bp_agreed && !bp->bp_synced) ||
+		    (bp->bp_operedge && !bp->bp_synced) ||
+		    (bp->bp_sync && bp->bp_synced)) {
+			bstp_timer_stop(&bp->bp_recent_root_timer);
+			bp->bp_synced = 1;
+			bp->bp_sync = 0;
+			DPRINTF("%s -> DESIGNATED_SYNCED\n",
+			    bp->bp_ifp->if_xname);
+		}
+
+		if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
+		    !bp->bp_agreed && !bp->bp_proposing &&
+		    !bp->bp_operedge) {
+			bp->bp_proposing = 1;
+			bp->bp_flags |= BSTP_PORT_NEWINFO;
+			bstp_timer_start(&bp->bp_edge_delay_timer,
+			    (bp->bp_ptp_link ? BSTP_DEFAULT_MIGRATE_DELAY :
+			     bp->bp_desg_max_age));
+			DPRINTF("%s -> DESIGNATED_PROPOSE\n",
+			    bp->bp_ifp->if_xname);
+		}
+
+		if (bp->bp_state != BSTP_IFSTATE_FORWARDING &&
+		    (bp->bp_forward_delay_timer.active == 0 || bp->bp_agreed ||
+		    bp->bp_operedge) &&
+		    (bp->bp_recent_root_timer.active == 0 || !bp->bp_reroot) &&
+		    !bp->bp_sync) {
+			if (bp->bp_agreed)
+				DPRINTF("%s -> AGREED\n", bp->bp_ifp->if_xname);
+			/*
+			 * If agreed|operedge then go straight to forwarding,
+			 * otherwise follow discard -> learn -> forward.
+			 */
+			if (bp->bp_agreed || bp->bp_operedge ||
+			    bp->bp_state == BSTP_IFSTATE_LEARNING) {
+				bstp_set_port_state(bp,
+				    BSTP_IFSTATE_FORWARDING);
+				bp->bp_agreed = bp->bp_protover;
+			} else if (bp->bp_state == BSTP_IFSTATE_DISCARDING)
+				bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
+		}
+
+		if (((bp->bp_sync && !bp->bp_synced) ||
+		    (bp->bp_reroot && bp->bp_recent_root_timer.active) ||
+		    (bp->bp_flags & BSTP_PORT_DISPUTED)) && !bp->bp_operedge &&
+		    bp->bp_state != BSTP_IFSTATE_DISCARDING) {
+			bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
+			bp->bp_flags &= ~BSTP_PORT_DISPUTED;
+			bstp_timer_start(&bp->bp_forward_delay_timer,
+			    bp->bp_protover == BSTP_PROTO_RSTP ?
+			    bp->bp_desg_htime : bp->bp_desg_fdelay);
+			DPRINTF("%s -> DESIGNATED_DISCARD\n",
+			    bp->bp_ifp->if_xname);
+		}
+		break;
+	}
+
+	if (bp->bp_flags & BSTP_PORT_NEWINFO)
+		bstp_transmit(bs, bp);
+}
+
+static void
+bstp_update_tc(struct bstp_port *bp)
+{
+	switch (bp->bp_tcstate) {
+		case BSTP_TCSTATE_ACTIVE:
+			if ((bp->bp_role != BSTP_ROLE_DESIGNATED &&
+			    bp->bp_role != BSTP_ROLE_ROOT) || bp->bp_operedge)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
+
+			if (bp->bp_rcvdtcn)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_TCN);
+			if (bp->bp_rcvdtc)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_TC);
+
+			if (bp->bp_tc_prop && !bp->bp_operedge)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_PROPAG);
+
+			if (bp->bp_rcvdtca)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_ACK);
+			break;
+
+		case BSTP_TCSTATE_INACTIVE:
+			if ((bp->bp_state == BSTP_IFSTATE_LEARNING ||
+			    bp->bp_state == BSTP_IFSTATE_FORWARDING) &&
+			    bp->bp_fdbflush == 0)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
+			break;
+
+		case BSTP_TCSTATE_LEARNING:
+			if (bp->bp_rcvdtc || bp->bp_rcvdtcn || bp->bp_rcvdtca ||
+			    bp->bp_tc_prop)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_LEARNING);
+			else if (bp->bp_role != BSTP_ROLE_DESIGNATED &&
+				 bp->bp_role != BSTP_ROLE_ROOT &&
+				 bp->bp_state == BSTP_IFSTATE_DISCARDING)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
+
+			if ((bp->bp_role == BSTP_ROLE_DESIGNATED ||
+			    bp->bp_role == BSTP_ROLE_ROOT) &&
+			    bp->bp_state == BSTP_IFSTATE_FORWARDING &&
+			    !bp->bp_operedge)
+				bstp_set_port_tc(bp, BSTP_TCSTATE_DETECTED);
+			break;
+
+		/* these are transient states and go straight back to ACTIVE */
+		case BSTP_TCSTATE_DETECTED:
+		case BSTP_TCSTATE_TCN:
+		case BSTP_TCSTATE_TC:
+		case BSTP_TCSTATE_PROPAG:
+		case BSTP_TCSTATE_ACK:
+			DPRINTF("Invalid TC state for %s\n",
+			    bp->bp_ifp->if_xname);
+			break;
+	}
+
+}
+
+static void
+bstp_update_info(struct bstp_port *bp)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	bp->bp_proposing = 0;
+	bp->bp_proposed = 0;
+
+	if (bp->bp_agreed && !bstp_pdu_bettersame(bp, BSTP_INFO_MINE))
+		bp->bp_agreed = 0;
+
+	if (bp->bp_synced && !bp->bp_agreed) {
+		bp->bp_synced = 0;
+		bs->bs_allsynced = 0;
+	}
+
+	/* copy the designated pv to the port */
+	bp->bp_port_pv = bp->bp_desg_pv;
+	bp->bp_port_msg_age = bp->bp_desg_msg_age;
+	bp->bp_port_max_age = bp->bp_desg_max_age;
+	bp->bp_port_fdelay = bp->bp_desg_fdelay;
+	bp->bp_port_htime = bp->bp_desg_htime;
+	bp->bp_infois = BSTP_INFO_MINE;
+
+	/* Set transmit flag but do not immediately send */
+	bp->bp_flags |= BSTP_PORT_NEWINFO;
+}
+
+/* set tcprop on every port other than the caller */
+static void
+bstp_set_other_tcprop(struct bstp_port *bp)
+{
+	struct bstp_state *bs = bp->bp_bs;
+	struct bstp_port *bp2;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
+		if (bp2 == bp)
+			continue;
+		bp2->bp_tc_prop = 1;
+	}
+}
+
+static void
+bstp_set_all_reroot(struct bstp_state *bs)
+{
+	struct bstp_port *bp;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
+		bp->bp_reroot = 1;
+}
+
+static void
+bstp_set_all_sync(struct bstp_state *bs)
+{
+	struct bstp_port *bp;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		bp->bp_sync = 1;
+		bp->bp_synced = 0;	/* Not explicit in spec */
+	}
+
+	bs->bs_allsynced = 0;
+}
+
+static void
+bstp_set_port_state(struct bstp_port *bp, int state)
+{
+	if (bp->bp_state == state)
+		return;
+
+	bp->bp_state = state;
+
+	switch (bp->bp_state) {
+		case BSTP_IFSTATE_DISCARDING:
+			DPRINTF("state changed to DISCARDING on %s\n",
+			    bp->bp_ifp->if_xname);
+			break;
+
+		case BSTP_IFSTATE_LEARNING:
+			DPRINTF("state changed to LEARNING on %s\n",
+			    bp->bp_ifp->if_xname);
+
+			bstp_timer_start(&bp->bp_forward_delay_timer,
+			    bp->bp_protover == BSTP_PROTO_RSTP ?
+			    bp->bp_desg_htime : bp->bp_desg_fdelay);
+			break;
+
+		case BSTP_IFSTATE_FORWARDING:
+			DPRINTF("state changed to FORWARDING on %s\n",
+			    bp->bp_ifp->if_xname);
+
+			bstp_timer_stop(&bp->bp_forward_delay_timer);
+			/* Record that we enabled forwarding */
+			bp->bp_forward_transitions++;
+			break;
+	}
+
+	/* notify the parent bridge */
+	taskqueue_enqueue(taskqueue_swi, &bp->bp_statetask);
+}
+
+static void
+bstp_set_port_role(struct bstp_port *bp, int role)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	if (bp->bp_role == role)
+		return;
+
+	/* perform pre-change tasks */
+	switch (bp->bp_role) {
+		case BSTP_ROLE_DISABLED:
+			bstp_timer_start(&bp->bp_forward_delay_timer,
+			    bp->bp_desg_max_age);
+			break;
+
+		case BSTP_ROLE_BACKUP:
+			bstp_timer_start(&bp->bp_recent_backup_timer,
+			    bp->bp_desg_htime * 2);
+			/* fall through */
+		case BSTP_ROLE_ALTERNATE:
+			bstp_timer_start(&bp->bp_forward_delay_timer,
+			    bp->bp_desg_fdelay);
+			bp->bp_sync = 0;
+			bp->bp_synced = 1;
+			bp->bp_reroot = 0;
+			break;
+
+		case BSTP_ROLE_ROOT:
+			bstp_timer_start(&bp->bp_recent_root_timer,
+			    BSTP_DEFAULT_FORWARD_DELAY);
+			break;
+	}
+
+	bp->bp_role = role;
+	/* clear values not carried between roles */
+	bp->bp_proposing = 0;
+	bs->bs_allsynced = 0;
+
+	/* initialise the new role */
+	switch (bp->bp_role) {
+		case BSTP_ROLE_DISABLED:
+		case BSTP_ROLE_ALTERNATE:
+		case BSTP_ROLE_BACKUP:
+			DPRINTF("%s role -> ALT/BACK/DISABLED\n",
+			    bp->bp_ifp->if_xname);
+			bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
+			bstp_timer_stop(&bp->bp_recent_root_timer);
+			bstp_timer_latch(&bp->bp_forward_delay_timer);
+			bp->bp_sync = 0;
+			bp->bp_synced = 1;
+			bp->bp_reroot = 0;
+			break;
+
+		case BSTP_ROLE_ROOT:
+			DPRINTF("%s role -> ROOT\n",
+			    bp->bp_ifp->if_xname);
+			bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
+			bstp_timer_latch(&bp->bp_recent_root_timer);
+			bp->bp_proposing = 0;
+			break;
+
+		case BSTP_ROLE_DESIGNATED:
+			DPRINTF("%s role -> DESIGNATED\n",
+			    bp->bp_ifp->if_xname);
+			bstp_timer_start(&bp->bp_hello_timer,
+			    bp->bp_desg_htime);
+			bp->bp_agree = 0;
+			break;
+	}
+
+	/* let the TC state know that the role changed */
+	bstp_update_tc(bp);
+}
+
+static void
+bstp_set_port_proto(struct bstp_port *bp, int proto)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	/* supported protocol versions */
+	switch (proto) {
+		case BSTP_PROTO_STP:
+			/* we can downgrade protocols only */
+			bstp_timer_stop(&bp->bp_migrate_delay_timer);
+			/* clear unsupported features */
+			bp->bp_operedge = 0;
+			/* STP compat mode only uses 16 bits of the 32 */
+			if (bp->bp_path_cost > 65535)
+				bp->bp_path_cost = 65535;
+			break;
+
+		case BSTP_PROTO_RSTP:
+			bstp_timer_start(&bp->bp_migrate_delay_timer,
+			    bs->bs_migration_delay);
+			break;
+
+		default:
+			DPRINTF("Unsupported STP version %d\n", proto);
+			return;
+	}
+
+	bp->bp_protover = proto;
+	bp->bp_flags &= ~BSTP_PORT_CANMIGRATE;
+}
+
+static void
+bstp_set_port_tc(struct bstp_port *bp, int state)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	bp->bp_tcstate = state;
+
+	/* initialise the new state */
+	switch (bp->bp_tcstate) {
+		case BSTP_TCSTATE_ACTIVE:
+			DPRINTF("%s -> TC_ACTIVE\n", bp->bp_ifp->if_xname);
+			/* nothing to do */
+			break;
+
+		case BSTP_TCSTATE_INACTIVE:
+			bstp_timer_stop(&bp->bp_tc_timer);
+			/* flush routes on the parent bridge */
+			bp->bp_fdbflush = 1;
+			taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
+			bp->bp_tc_ack = 0;
+			DPRINTF("%s -> TC_INACTIVE\n", bp->bp_ifp->if_xname);
+			break;
+
+		case BSTP_TCSTATE_LEARNING:
+			bp->bp_rcvdtc = 0;
+			bp->bp_rcvdtcn = 0;
+			bp->bp_rcvdtca = 0;
+			bp->bp_tc_prop = 0;
+			DPRINTF("%s -> TC_LEARNING\n", bp->bp_ifp->if_xname);
+			break;
+
+		case BSTP_TCSTATE_DETECTED:
+			bstp_set_timer_tc(bp);
+			bstp_set_other_tcprop(bp);
+			/* send out notification */
+			bp->bp_flags |= BSTP_PORT_NEWINFO;
+			bstp_transmit(bs, bp);
+			getmicrotime(&bs->bs_last_tc_time);
+			DPRINTF("%s -> TC_DETECTED\n", bp->bp_ifp->if_xname);
+			bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
+			break;
+
+		case BSTP_TCSTATE_TCN:
+			bstp_set_timer_tc(bp);
+			DPRINTF("%s -> TC_TCN\n", bp->bp_ifp->if_xname);
+			/* fall through */
+		case BSTP_TCSTATE_TC:
+			bp->bp_rcvdtc = 0;
+			bp->bp_rcvdtcn = 0;
+			if (bp->bp_role == BSTP_ROLE_DESIGNATED)
+				bp->bp_tc_ack = 1;
+
+			bstp_set_other_tcprop(bp);
+			DPRINTF("%s -> TC_TC\n", bp->bp_ifp->if_xname);
+			bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
+			break;
+
+		case BSTP_TCSTATE_PROPAG:
+			/* flush routes on the parent bridge */
+			bp->bp_fdbflush = 1;
+			taskqueue_enqueue(taskqueue_swi, &bp->bp_rtagetask);
+			bp->bp_tc_prop = 0;
+			bstp_set_timer_tc(bp);
+			DPRINTF("%s -> TC_PROPAG\n", bp->bp_ifp->if_xname);
+			bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
+			break;
+
+		case BSTP_TCSTATE_ACK:
+			bstp_timer_stop(&bp->bp_tc_timer);
+			bp->bp_rcvdtca = 0;
+			DPRINTF("%s -> TC_ACK\n", bp->bp_ifp->if_xname);
+			bp->bp_tcstate = BSTP_TCSTATE_ACTIVE; /* UCT */
+			break;
+	}
+}
+
+static void
+bstp_set_timer_tc(struct bstp_port *bp)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	if (bp->bp_tc_timer.active)
+		return;
+
+	switch (bp->bp_protover) {
+		case BSTP_PROTO_RSTP:
+			bstp_timer_start(&bp->bp_tc_timer,
+			    bp->bp_desg_htime + BSTP_TICK_VAL);
+			bp->bp_flags |= BSTP_PORT_NEWINFO;
+			break;
+
+		case BSTP_PROTO_STP:
+			bstp_timer_start(&bp->bp_tc_timer,
+			    bs->bs_root_max_age + bs->bs_root_fdelay);
+			break;
+	}
+}
+
+static void
+bstp_set_timer_msgage(struct bstp_port *bp)
+{
+	if (bp->bp_port_msg_age + BSTP_MESSAGE_AGE_INCR <=
+	    bp->bp_port_max_age) {
+		bstp_timer_start(&bp->bp_message_age_timer,
+		    bp->bp_port_htime * 3);
+	} else
+		/* expires immediately */
+		bstp_timer_start(&bp->bp_message_age_timer, 0);
+}
+
+static int
+bstp_rerooted(struct bstp_state *bs, struct bstp_port *bp)
+{
+	struct bstp_port *bp2;
+	int rr_set = 0;
+
+	LIST_FOREACH(bp2, &bs->bs_bplist, bp_next) {
+		if (bp2 == bp)
+			continue;
+		if (bp2->bp_recent_root_timer.active) {
+			rr_set = 1;
+			break;
+		}
+	}
+	return (!rr_set);
+}
+
+int
+bstp_set_htime(struct bstp_state *bs, int t)
+{
+	/* convert seconds to ticks */
+	t *=  BSTP_TICK_VAL;
+
+	/* value can only be changed in leagacy stp mode */
+	if (bs->bs_protover != BSTP_PROTO_STP)
+		return (EPERM);
+
+	if (t < BSTP_MIN_HELLO_TIME || t > BSTP_MAX_HELLO_TIME)
+		return (EINVAL);
+
+	BSTP_LOCK(bs);
+	bs->bs_bridge_htime = t;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_fdelay(struct bstp_state *bs, int t)
+{
+	/* convert seconds to ticks */
+	t *= BSTP_TICK_VAL;
+
+	if (t < BSTP_MIN_FORWARD_DELAY || t > BSTP_MAX_FORWARD_DELAY)
+		return (EINVAL);
+
+	BSTP_LOCK(bs);
+	bs->bs_bridge_fdelay = t;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_maxage(struct bstp_state *bs, int t)
+{
+	/* convert seconds to ticks */
+	t *= BSTP_TICK_VAL;
+
+	if (t < BSTP_MIN_MAX_AGE || t > BSTP_MAX_MAX_AGE)
+		return (EINVAL);
+
+	BSTP_LOCK(bs);
+	bs->bs_bridge_max_age = t;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_holdcount(struct bstp_state *bs, int count)
+{
+	struct bstp_port *bp;
+
+	if (count < BSTP_MIN_HOLD_COUNT ||
+	    count > BSTP_MAX_HOLD_COUNT)
+		return (EINVAL);
+
+	BSTP_LOCK(bs);
+	bs->bs_txholdcount = count;
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
+		bp->bp_txcount = 0;
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_protocol(struct bstp_state *bs, int proto)
+{
+	struct bstp_port *bp;
+
+	switch (proto) {
+		/* Supported protocol versions */
+		case BSTP_PROTO_STP:
+		case BSTP_PROTO_RSTP:
+			break;
+
+		default:
+			return (EINVAL);
+	}
+
+	BSTP_LOCK(bs);
+	bs->bs_protover = proto;
+	bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		/* reinit state */
+		bp->bp_infois = BSTP_INFO_DISABLED;
+		bp->bp_txcount = 0;
+		bstp_set_port_proto(bp, bs->bs_protover);
+		bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
+		bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
+		bstp_timer_stop(&bp->bp_recent_backup_timer);
+	}
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_priority(struct bstp_state *bs, int pri)
+{
+	if (pri < 0 || pri > BSTP_MAX_PRIORITY)
+		return (EINVAL);
+
+	/* Limit to steps of 4096 */
+	pri -= pri % 4096;
+
+	BSTP_LOCK(bs);
+	bs->bs_bridge_priority = pri;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_port_priority(struct bstp_port *bp, int pri)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	if (pri < 0 || pri > BSTP_MAX_PORT_PRIORITY)
+		return (EINVAL);
+
+	/* Limit to steps of 16 */
+	pri -= pri % 16;
+
+	BSTP_LOCK(bs);
+	bp->bp_priority = pri;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_path_cost(struct bstp_port *bp, uint32_t path_cost)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	if (path_cost > BSTP_MAX_PATH_COST)
+		return (EINVAL);
+
+	/* STP compat mode only uses 16 bits of the 32 */
+	if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
+		path_cost = 65535;
+
+	BSTP_LOCK(bs);
+
+	if (path_cost == 0) {	/* use auto */
+		bp->bp_flags &= ~BSTP_PORT_ADMCOST;
+		bp->bp_path_cost = bstp_calc_path_cost(bp);
+	} else {
+		bp->bp_path_cost = path_cost;
+		bp->bp_flags |= BSTP_PORT_ADMCOST;
+	}
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_edge(struct bstp_port *bp, int set)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	BSTP_LOCK(bs);
+	if ((bp->bp_operedge = set) == 0)
+		bp->bp_flags &= ~BSTP_PORT_ADMEDGE;
+	else
+		bp->bp_flags |= BSTP_PORT_ADMEDGE;
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_autoedge(struct bstp_port *bp, int set)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	BSTP_LOCK(bs);
+	if (set) {
+		bp->bp_flags |= BSTP_PORT_AUTOEDGE;
+		/* we may be able to transition straight to edge */
+		if (bp->bp_edge_delay_timer.active == 0)
+			bstp_edge_delay_expiry(bs, bp);
+	} else
+		bp->bp_flags &= ~BSTP_PORT_AUTOEDGE;
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_ptp(struct bstp_port *bp, int set)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	BSTP_LOCK(bs);
+	bp->bp_ptp_link = set;
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_set_autoptp(struct bstp_port *bp, int set)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	BSTP_LOCK(bs);
+	if (set) {
+		bp->bp_flags |= BSTP_PORT_AUTOPTP;
+		if (bp->bp_role != BSTP_ROLE_DISABLED)
+			bstp_ifupdstatus(bs, bp);
+	} else
+		bp->bp_flags &= ~BSTP_PORT_AUTOPTP;
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+/*
+ * Calculate the path cost according to the link speed.
+ */
+static uint32_t
+bstp_calc_path_cost(struct bstp_port *bp)
+{
+	struct ifnet *ifp = bp->bp_ifp;
+	uint32_t path_cost;
+
+	/* If the priority has been manually set then retain the value */
+	if (bp->bp_flags & BSTP_PORT_ADMCOST)
+		return bp->bp_path_cost;
+
+	if (ifp->if_link_state == LINK_STATE_DOWN) {
+		/* Recalc when the link comes up again */
+		bp->bp_flags |= BSTP_PORT_PNDCOST;
+		return (BSTP_DEFAULT_PATH_COST);
+	}
+
+	if (ifp->if_baudrate < 1000)
+		return (BSTP_DEFAULT_PATH_COST);
+
+ 	/* formula from section 17.14, IEEE Std 802.1D-2004 */
+	path_cost = 20000000000ULL / (ifp->if_baudrate / 1000);
+
+	if (path_cost > BSTP_MAX_PATH_COST)
+		path_cost = BSTP_MAX_PATH_COST;
+
+	/* STP compat mode only uses 16 bits of the 32 */
+	if (bp->bp_protover == BSTP_PROTO_STP && path_cost > 65535)
+		path_cost = 65535;
+
+	return (path_cost);
+}
+
+/*
+ * Notify the bridge that a port state has changed, we need to do this from a
+ * taskqueue to avoid a LOR.
+ */
+static void
+bstp_notify_state(void *arg, int pending)
+{
+	struct bstp_port *bp = (struct bstp_port *)arg;
+	struct bstp_state *bs = bp->bp_bs;
+
+	if (bp->bp_active == 1 && bs->bs_state_cb != NULL)
+		(*bs->bs_state_cb)(bp->bp_ifp, bp->bp_state);
+}
+
+/*
+ * Flush the routes on the bridge port, we need to do this from a
+ * taskqueue to avoid a LOR.
+ */
+static void
+bstp_notify_rtage(void *arg, int pending)
+{
+	struct bstp_port *bp = (struct bstp_port *)arg;
+	struct bstp_state *bs = bp->bp_bs;
+	int age = 0;
+
+	BSTP_LOCK(bs);
+	switch (bp->bp_protover) {
+		case BSTP_PROTO_STP:
+			/* convert to seconds */
+			age = bp->bp_desg_fdelay / BSTP_TICK_VAL;
+			break;
+
+		case BSTP_PROTO_RSTP:
+			age = 0;
+			break;
+	}
+	BSTP_UNLOCK(bs);
+
+	if (bp->bp_active == 1 && bs->bs_rtage_cb != NULL)
+		(*bs->bs_rtage_cb)(bp->bp_ifp, age);
+
+	/* flush is complete */
+	BSTP_LOCK(bs);
+	bp->bp_fdbflush = 0;
+	BSTP_UNLOCK(bs);
+}
+
+void
+bstp_linkstate(struct ifnet *ifp, int state)
+{
+	struct bstp_state *bs;
+	struct bstp_port *bp;
+
+	/* search for the stp port */
+	mtx_lock(&bstp_list_mtx);
+	LIST_FOREACH(bs, &bstp_list, bs_list) {
+		BSTP_LOCK(bs);
+		LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+			if (bp->bp_ifp == ifp) {
+				bstp_ifupdstatus(bs, bp);
+				bstp_update_state(bs, bp);
+				/* it only exists once so return */
+				BSTP_UNLOCK(bs);
+				mtx_unlock(&bstp_list_mtx);
+				return;
+			}
+		}
+		BSTP_UNLOCK(bs);
+	}
+	mtx_unlock(&bstp_list_mtx);
+}
+
+static void
+bstp_ifupdstatus(struct bstp_state *bs, struct bstp_port *bp)
+{
+	struct ifnet *ifp = bp->bp_ifp;
+	struct ifmediareq ifmr;
+	int error = 0;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	bzero((char *)&ifmr, sizeof(ifmr));
+	error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
+
+	if ((error == 0) && (ifp->if_flags & IFF_UP)) {
+		if (ifmr.ifm_status & IFM_ACTIVE) {
+			/* A full-duplex link is assumed to be point to point */
+			if (bp->bp_flags & BSTP_PORT_AUTOPTP) {
+				bp->bp_ptp_link =
+				    ifmr.ifm_active & IFM_FDX ? 1 : 0;
+			}
+
+			/* Calc the cost if the link was down previously */
+			if (bp->bp_flags & BSTP_PORT_PNDCOST) {
+				bp->bp_path_cost = bstp_calc_path_cost(bp);
+				bp->bp_flags &= ~BSTP_PORT_PNDCOST;
+			}
+
+			if (bp->bp_role == BSTP_ROLE_DISABLED)
+				bstp_enable_port(bs, bp);
+		} else {
+			if (bp->bp_role != BSTP_ROLE_DISABLED) {
+				bstp_disable_port(bs, bp);
+				if ((bp->bp_flags & BSTP_PORT_ADMEDGE) &&
+				    bp->bp_protover == BSTP_PROTO_RSTP)
+					bp->bp_operedge = 1;
+			}
+		}
+		return;
+	}
+
+	if (bp->bp_infois != BSTP_INFO_DISABLED)
+		bstp_disable_port(bs, bp);
+}
+
+static void
+bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
+{
+	bp->bp_infois = BSTP_INFO_AGED;
+	bstp_assign_roles(bs);
+}
+
+static void
+bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
+{
+	bp->bp_infois = BSTP_INFO_DISABLED;
+	bstp_assign_roles(bs);
+}
+
+static void
+bstp_tick(void *arg)
+{
+	struct bstp_state *bs = arg;
+	struct bstp_port *bp;
+
+	BSTP_LOCK_ASSERT(bs);
+
+	if (bs->bs_running == 0)
+		return;
+
+	/* slow timer to catch missed link events */
+	if (bstp_timer_expired(&bs->bs_link_timer)) {
+		LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
+			bstp_ifupdstatus(bs, bp);
+		bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
+	}
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		/* no events need to happen for these */
+		bstp_timer_expired(&bp->bp_tc_timer);
+		bstp_timer_expired(&bp->bp_recent_root_timer);
+		bstp_timer_expired(&bp->bp_forward_delay_timer);
+		bstp_timer_expired(&bp->bp_recent_backup_timer);
+
+		if (bstp_timer_expired(&bp->bp_hello_timer))
+			bstp_hello_timer_expiry(bs, bp);
+
+		if (bstp_timer_expired(&bp->bp_message_age_timer))
+			bstp_message_age_expiry(bs, bp);
+
+		if (bstp_timer_expired(&bp->bp_migrate_delay_timer))
+			bstp_migrate_delay_expiry(bs, bp);
+
+		if (bstp_timer_expired(&bp->bp_edge_delay_timer))
+			bstp_edge_delay_expiry(bs, bp);
+
+		/* update the various state machines for the port */
+		bstp_update_state(bs, bp);
+
+		if (bp->bp_txcount > 0)
+			bp->bp_txcount--;
+	}
+
+	callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
+}
+
+static void
+bstp_timer_start(struct bstp_timer *t, uint16_t v)
+{
+	t->value = v;
+	t->active = 1;
+	t->latched = 0;
+}
+
+static void
+bstp_timer_stop(struct bstp_timer *t)
+{
+	t->value = 0;
+	t->active = 0;
+	t->latched = 0;
+}
+
+static void
+bstp_timer_latch(struct bstp_timer *t)
+{
+	t->latched = 1;
+	t->active = 1;
+}
+
+static int
+bstp_timer_expired(struct bstp_timer *t)
+{
+	if (t->active == 0 || t->latched)
+		return (0);
+	t->value -= BSTP_TICK_VAL;
+	if (t->value <= 0) {
+		bstp_timer_stop(t);
+		return (1);
+	}
+	return (0);
+}
+
+static void
+bstp_hello_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
+{
+	if ((bp->bp_flags & BSTP_PORT_NEWINFO) ||
+	    bp->bp_role == BSTP_ROLE_DESIGNATED ||
+	    (bp->bp_role == BSTP_ROLE_ROOT &&
+	     bp->bp_tc_timer.active == 1)) {
+		bstp_timer_start(&bp->bp_hello_timer, bp->bp_desg_htime);
+		bp->bp_flags |= BSTP_PORT_NEWINFO;
+		bstp_transmit(bs, bp);
+	}
+}
+
+static void
+bstp_message_age_expiry(struct bstp_state *bs, struct bstp_port *bp)
+{
+	if (bp->bp_infois == BSTP_INFO_RECEIVED) {
+		bp->bp_infois = BSTP_INFO_AGED;
+		bstp_assign_roles(bs);
+		DPRINTF("aged info on %s\n", bp->bp_ifp->if_xname);
+	}
+}
+
+static void
+bstp_migrate_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
+{
+	bp->bp_flags |= BSTP_PORT_CANMIGRATE;
+}
+
+static void
+bstp_edge_delay_expiry(struct bstp_state *bs, struct bstp_port *bp)
+{
+	if ((bp->bp_flags & BSTP_PORT_AUTOEDGE) &&
+	    bp->bp_protover == BSTP_PROTO_RSTP && bp->bp_proposing &&
+	    bp->bp_role == BSTP_ROLE_DESIGNATED) {
+		bp->bp_operedge = 1;
+		DPRINTF("%s -> edge port\n", bp->bp_ifp->if_xname);
+	}
+}
+
+static int
+bstp_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);
+}
+
+/*
+ * compare the bridge address component of the bridgeid
+ */
+static int
+bstp_same_bridgeid(uint64_t id1, uint64_t id2)
+{
+	u_char addr1[ETHER_ADDR_LEN];
+	u_char addr2[ETHER_ADDR_LEN];
+
+	PV2ADDR(id1, addr1);
+	PV2ADDR(id2, addr2);
+
+	if (bstp_addr_cmp(addr1, addr2) == 0)
+		return (1);
+
+	return (0);
+}
+
+void
+bstp_reinit(struct bstp_state *bs)
+{
+	struct bstp_port *bp;
+	struct ifnet *ifp, *mif;
+	u_char *e_addr;
+	static const u_char llzero[ETHER_ADDR_LEN];	/* 00:00:00:00:00:00 */
+
+	BSTP_LOCK_ASSERT(bs);
+
+	mif = NULL;
+	/*
+	 * Search through the Ethernet adapters and find the one with the
+	 * lowest value. The adapter which we take the MAC address from does
+	 * not need to be part of the bridge, it just needs to be a unique
+	 * value.
+	 */
+	IFNET_RLOCK_NOSLEEP();
+	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
+		if (ifp->if_type != IFT_ETHER)
+			continue;
+
+		if (bstp_addr_cmp(IF_LLADDR(ifp), llzero) == 0)
+			continue;
+
+		if (mif == NULL) {
+			mif = ifp;
+			continue;
+		}
+		if (bstp_addr_cmp(IF_LLADDR(ifp), IF_LLADDR(mif)) < 0) {
+			mif = ifp;
+			continue;
+		}
+	}
+	IFNET_RUNLOCK_NOSLEEP();
+
+	if (LIST_EMPTY(&bs->bs_bplist) || mif == NULL) {
+		/* Set the bridge and root id (lower bits) to zero */
+		bs->bs_bridge_pv.pv_dbridge_id =
+		    ((uint64_t)bs->bs_bridge_priority) << 48;
+		bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
+		bs->bs_root_pv = bs->bs_bridge_pv;
+		/* Disable any remaining ports, they will have no MAC address */
+		LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+			bp->bp_infois = BSTP_INFO_DISABLED;
+			bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
+		}
+		callout_stop(&bs->bs_bstpcallout);
+		return;
+	}
+
+	e_addr = IF_LLADDR(mif);
+	bs->bs_bridge_pv.pv_dbridge_id =
+	    (((uint64_t)bs->bs_bridge_priority) << 48) |
+	    (((uint64_t)e_addr[0]) << 40) |
+	    (((uint64_t)e_addr[1]) << 32) |
+	    (((uint64_t)e_addr[2]) << 24) |
+	    (((uint64_t)e_addr[3]) << 16) |
+	    (((uint64_t)e_addr[4]) << 8) |
+	    (((uint64_t)e_addr[5]));
+
+	bs->bs_bridge_pv.pv_root_id = bs->bs_bridge_pv.pv_dbridge_id;
+	bs->bs_bridge_pv.pv_cost = 0;
+	bs->bs_bridge_pv.pv_dport_id = 0;
+	bs->bs_bridge_pv.pv_port_id = 0;
+
+	if (bs->bs_running && callout_pending(&bs->bs_bstpcallout) == 0)
+		callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
+		bp->bp_port_id = (bp->bp_priority << 8) |
+		    (bp->bp_ifp->if_index  & 0xfff);
+		bstp_ifupdstatus(bs, bp);
+	}
+
+	bstp_assign_roles(bs);
+	bstp_timer_start(&bs->bs_link_timer, BSTP_LINK_TIMER);
+}
+
+static int
+bstp_modevent(module_t mod, int type, void *data)
+{
+	switch (type) {
+	case MOD_LOAD:
+		mtx_init(&bstp_list_mtx, "bridgestp list", NULL, MTX_DEF);
+		LIST_INIT(&bstp_list);
+		bstp_linkstate_p = bstp_linkstate;
+		break;
+	case MOD_UNLOAD:
+		bstp_linkstate_p = NULL;
+		mtx_destroy(&bstp_list_mtx);
+		break;
+	default:
+		return (EOPNOTSUPP);
+	}
+	return (0);
+}
+
+static moduledata_t bstp_mod = {
+	"bridgestp",
+	bstp_modevent,
+	0
+};
+
+DECLARE_MODULE(bridgestp, bstp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+MODULE_VERSION(bridgestp, 1);
+
+void
+bstp_attach(struct bstp_state *bs, struct bstp_cb_ops *cb)
+{
+	BSTP_LOCK_INIT(bs);
+	callout_init_mtx(&bs->bs_bstpcallout, &bs->bs_mtx, 0);
+	LIST_INIT(&bs->bs_bplist);
+
+	bs->bs_bridge_max_age = BSTP_DEFAULT_MAX_AGE;
+	bs->bs_bridge_htime = BSTP_DEFAULT_HELLO_TIME;
+	bs->bs_bridge_fdelay = BSTP_DEFAULT_FORWARD_DELAY;
+	bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
+	bs->bs_hold_time = BSTP_DEFAULT_HOLD_TIME;
+	bs->bs_migration_delay = BSTP_DEFAULT_MIGRATE_DELAY;
+	bs->bs_txholdcount = BSTP_DEFAULT_HOLD_COUNT;
+	bs->bs_protover = BSTP_PROTO_RSTP;
+	bs->bs_state_cb = cb->bcb_state;
+	bs->bs_rtage_cb = cb->bcb_rtage;
+
+	getmicrotime(&bs->bs_last_tc_time);
+
+	mtx_lock(&bstp_list_mtx);
+	LIST_INSERT_HEAD(&bstp_list, bs, bs_list);
+	mtx_unlock(&bstp_list_mtx);
+}
+
+void
+bstp_detach(struct bstp_state *bs)
+{
+	KASSERT(LIST_EMPTY(&bs->bs_bplist), ("bstp still active"));
+
+	mtx_lock(&bstp_list_mtx);
+	LIST_REMOVE(bs, bs_list);
+	mtx_unlock(&bstp_list_mtx);
+	callout_drain(&bs->bs_bstpcallout);
+	BSTP_LOCK_DESTROY(bs);
+}
+
+void
+bstp_init(struct bstp_state *bs)
+{
+	BSTP_LOCK(bs);
+	callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
+	bs->bs_running = 1;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+}
+
+void
+bstp_stop(struct bstp_state *bs)
+{
+	struct bstp_port *bp;
+
+	BSTP_LOCK(bs);
+
+	LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
+		bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
+
+	bs->bs_running = 0;
+	callout_stop(&bs->bs_bstpcallout);
+	BSTP_UNLOCK(bs);
+}
+
+int
+bstp_create(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *ifp)
+{
+	bzero(bp, sizeof(struct bstp_port));
+
+	BSTP_LOCK(bs);
+	bp->bp_ifp = ifp;
+	bp->bp_bs = bs;
+	bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
+	TASK_INIT(&bp->bp_statetask, 0, bstp_notify_state, bp);
+	TASK_INIT(&bp->bp_rtagetask, 0, bstp_notify_rtage, bp);
+
+	/* Init state */
+	bp->bp_infois = BSTP_INFO_DISABLED;
+	bp->bp_flags = BSTP_PORT_AUTOEDGE|BSTP_PORT_AUTOPTP;
+	bstp_set_port_state(bp, BSTP_IFSTATE_DISCARDING);
+	bstp_set_port_proto(bp, bs->bs_protover);
+	bstp_set_port_role(bp, BSTP_ROLE_DISABLED);
+	bstp_set_port_tc(bp, BSTP_TCSTATE_INACTIVE);
+	bp->bp_path_cost = bstp_calc_path_cost(bp);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+int
+bstp_enable(struct bstp_port *bp)
+{
+	struct bstp_state *bs = bp->bp_bs;
+	struct ifnet *ifp = bp->bp_ifp;
+
+	KASSERT(bp->bp_active == 0, ("already a bstp member"));
+
+	switch (ifp->if_type) {
+		case IFT_ETHER:	/* These can do spanning tree. */
+			break;
+		default:
+			/* Nothing else can. */
+			return (EINVAL);
+	}
+
+	BSTP_LOCK(bs);
+	LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
+	bp->bp_active = 1;
+	bp->bp_flags |= BSTP_PORT_NEWINFO;
+	bstp_reinit(bs);
+	bstp_update_roles(bs, bp);
+	BSTP_UNLOCK(bs);
+	return (0);
+}
+
+void
+bstp_disable(struct bstp_port *bp)
+{
+	struct bstp_state *bs = bp->bp_bs;
+
+	KASSERT(bp->bp_active == 1, ("not a bstp member"));
+
+	BSTP_LOCK(bs);
+	bstp_disable_port(bs, bp);
+	LIST_REMOVE(bp, bp_next);
+	bp->bp_active = 0;
+	bstp_reinit(bs);
+	BSTP_UNLOCK(bs);
+}
+
+/*
+ * The bstp_port structure is about to be freed by the parent bridge.
+ */
+void
+bstp_destroy(struct bstp_port *bp)
+{
+	KASSERT(bp->bp_active == 0, ("port is still attached"));
+	taskqueue_drain(taskqueue_swi, &bp->bp_statetask);
+	taskqueue_drain(taskqueue_swi, &bp->bp_rtagetask);
+}