691cdb5351
could initialise while unlocked if the bridge is not up when setting the inet address, ether_ioctl() would call bridge_init. Change it so bridge_init is always called unlocked and then locks before calling bstp_initialization(). Reported by: Michal Mertl Approved by: mlaier (mentor) MFC after: 3 days
1175 lines
32 KiB
C
1175 lines
32 KiB
C
/* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */
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/*
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* Copyright (c) 2000 Jason L. Wright (jason@thought.net)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jason L. Wright
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp
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*/
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/*
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* Implementation of the spanning tree protocol as defined in
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* ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998.
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* (In English: IEEE 802.1D, Draft 17, 1998)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/kernel.h>
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#include <sys/callout.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/if_llc.h>
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#include <net/if_media.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/if_ether.h>
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#include <net/if_bridgevar.h>
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/* BPDU message types */
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#define BSTP_MSGTYPE_CFG 0x00 /* Configuration */
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#define BSTP_MSGTYPE_TCN 0x80 /* Topology chg notification */
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/* BPDU flags */
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#define BSTP_FLAG_TC 0x01 /* Topology change */
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#define BSTP_FLAG_TCA 0x80 /* Topology change ack */
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#define BSTP_MESSAGE_AGE_INCR (1 * 256) /* in 256ths of a second */
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#define BSTP_TICK_VAL (1 * 256) /* in 256ths of a second */
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/*
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* Because BPDU's do not make nicely aligned structures, two different
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* declarations are used: bstp_?bpdu (wire representation, packed) and
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* bstp_*_unit (internal, nicely aligned version).
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*/
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/* configuration bridge protocol data unit */
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struct bstp_cbpdu {
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uint8_t cbu_dsap; /* LLC: destination sap */
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uint8_t cbu_ssap; /* LLC: source sap */
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uint8_t cbu_ctl; /* LLC: control */
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uint16_t cbu_protoid; /* protocol id */
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uint8_t cbu_protover; /* protocol version */
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uint8_t cbu_bpdutype; /* message type */
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uint8_t cbu_flags; /* flags (below) */
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/* root id */
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uint16_t cbu_rootpri; /* root priority */
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uint8_t cbu_rootaddr[6]; /* root address */
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uint32_t cbu_rootpathcost; /* root path cost */
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/* bridge id */
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uint16_t cbu_bridgepri; /* bridge priority */
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uint8_t cbu_bridgeaddr[6]; /* bridge address */
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uint16_t cbu_portid; /* port id */
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uint16_t cbu_messageage; /* current message age */
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uint16_t cbu_maxage; /* maximum age */
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uint16_t cbu_hellotime; /* hello time */
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uint16_t cbu_forwarddelay; /* forwarding delay */
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} __attribute__((__packed__));
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/* topology change notification bridge protocol data unit */
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struct bstp_tbpdu {
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uint8_t tbu_dsap; /* LLC: destination sap */
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uint8_t tbu_ssap; /* LLC: source sap */
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uint8_t tbu_ctl; /* LLC: control */
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uint16_t tbu_protoid; /* protocol id */
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uint8_t tbu_protover; /* protocol version */
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uint8_t tbu_bpdutype; /* message type */
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} __attribute__((__packed__));
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const uint8_t bstp_etheraddr[] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
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void bstp_initialize_port(struct bridge_softc *, struct bridge_iflist *);
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void bstp_ifupdstatus(struct bridge_softc *, struct bridge_iflist *);
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void bstp_enable_port(struct bridge_softc *, struct bridge_iflist *);
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void bstp_disable_port(struct bridge_softc *, struct bridge_iflist *);
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void bstp_enable_change_detection(struct bridge_iflist *);
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void bstp_disable_change_detection(struct bridge_iflist *);
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int bstp_root_bridge(struct bridge_softc *sc);
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int bstp_supersedes_port_info(struct bridge_softc *,
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struct bridge_iflist *, struct bstp_config_unit *);
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int bstp_designated_port(struct bridge_softc *, struct bridge_iflist *);
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int bstp_designated_for_some_port(struct bridge_softc *);
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void bstp_transmit_config(struct bridge_softc *, struct bridge_iflist *);
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void bstp_transmit_tcn(struct bridge_softc *);
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void bstp_received_config_bpdu(struct bridge_softc *,
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struct bridge_iflist *, struct bstp_config_unit *);
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void bstp_received_tcn_bpdu(struct bridge_softc *, struct bridge_iflist *,
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struct bstp_tcn_unit *);
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void bstp_record_config_information(struct bridge_softc *,
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struct bridge_iflist *, struct bstp_config_unit *);
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void bstp_record_config_timeout_values(struct bridge_softc *,
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struct bstp_config_unit *);
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void bstp_config_bpdu_generation(struct bridge_softc *);
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void bstp_send_config_bpdu(struct bridge_softc *, struct bridge_iflist *,
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struct bstp_config_unit *);
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void bstp_configuration_update(struct bridge_softc *);
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void bstp_root_selection(struct bridge_softc *);
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void bstp_designated_port_selection(struct bridge_softc *);
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void bstp_become_designated_port(struct bridge_softc *,
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struct bridge_iflist *);
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void bstp_port_state_selection(struct bridge_softc *);
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void bstp_make_forwarding(struct bridge_softc *, struct bridge_iflist *);
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void bstp_make_blocking(struct bridge_softc *, struct bridge_iflist *);
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void bstp_set_port_state(struct bridge_iflist *, uint8_t);
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void bstp_set_bridge_priority(struct bridge_softc *, uint64_t);
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void bstp_set_port_priority(struct bridge_softc *, struct bridge_iflist *,
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uint16_t);
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void bstp_set_path_cost(struct bridge_softc *, struct bridge_iflist *,
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uint32_t);
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void bstp_topology_change_detection(struct bridge_softc *);
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void bstp_topology_change_acknowledged(struct bridge_softc *);
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void bstp_acknowledge_topology_change(struct bridge_softc *,
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struct bridge_iflist *);
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void bstp_tick(void *);
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void bstp_timer_start(struct bridge_timer *, uint16_t);
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void bstp_timer_stop(struct bridge_timer *);
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int bstp_timer_expired(struct bridge_timer *, uint16_t);
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void bstp_hold_timer_expiry(struct bridge_softc *, struct bridge_iflist *);
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void bstp_message_age_timer_expiry(struct bridge_softc *,
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struct bridge_iflist *);
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void bstp_forward_delay_timer_expiry(struct bridge_softc *,
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struct bridge_iflist *);
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void bstp_topology_change_timer_expiry(struct bridge_softc *);
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void bstp_tcn_timer_expiry(struct bridge_softc *);
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void bstp_hello_timer_expiry(struct bridge_softc *);
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void
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bstp_transmit_config(struct bridge_softc *sc, struct bridge_iflist *bif)
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{
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if (bif->bif_hold_timer.active) {
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bif->bif_config_pending = 1;
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return;
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}
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bif->bif_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG;
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bif->bif_config_bpdu.cu_rootid = sc->sc_designated_root;
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bif->bif_config_bpdu.cu_root_path_cost = sc->sc_root_path_cost;
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bif->bif_config_bpdu.cu_bridge_id = sc->sc_bridge_id;
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bif->bif_config_bpdu.cu_port_id = bif->bif_port_id;
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if (bstp_root_bridge(sc))
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bif->bif_config_bpdu.cu_message_age = 0;
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else
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bif->bif_config_bpdu.cu_message_age =
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sc->sc_root_port->bif_message_age_timer.value +
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BSTP_MESSAGE_AGE_INCR;
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bif->bif_config_bpdu.cu_max_age = sc->sc_max_age;
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bif->bif_config_bpdu.cu_hello_time = sc->sc_hello_time;
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bif->bif_config_bpdu.cu_forward_delay = sc->sc_forward_delay;
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bif->bif_config_bpdu.cu_topology_change_acknowledgment
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= bif->bif_topology_change_acknowledge;
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bif->bif_config_bpdu.cu_topology_change = sc->sc_topology_change;
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if (bif->bif_config_bpdu.cu_message_age < sc->sc_max_age) {
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bif->bif_topology_change_acknowledge = 0;
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bif->bif_config_pending = 0;
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bstp_send_config_bpdu(sc, bif, &bif->bif_config_bpdu);
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bstp_timer_start(&bif->bif_hold_timer, 0);
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}
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}
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void
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bstp_send_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
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struct bstp_config_unit *cu)
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{
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struct ifnet *ifp;
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struct mbuf *m;
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struct ether_header *eh;
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struct bstp_cbpdu bpdu;
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BRIDGE_LOCK_ASSERT(sc);
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ifp = bif->bif_ifp;
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if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
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return;
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MGETHDR(m, M_DONTWAIT, MT_DATA);
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if (m == NULL)
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return;
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eh = mtod(m, struct ether_header *);
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m->m_pkthdr.rcvif = ifp;
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m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
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m->m_len = m->m_pkthdr.len;
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bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP;
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bpdu.cbu_ctl = LLC_UI;
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bpdu.cbu_protoid = htons(0);
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bpdu.cbu_protover = 0;
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bpdu.cbu_bpdutype = cu->cu_message_type;
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bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) |
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(cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0);
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bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48);
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bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40;
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bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32;
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bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24;
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bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16;
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bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8;
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bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0;
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bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost);
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bpdu.cbu_bridgepri = htons(cu->cu_rootid >> 48);
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bpdu.cbu_bridgeaddr[0] = cu->cu_rootid >> 40;
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bpdu.cbu_bridgeaddr[1] = cu->cu_rootid >> 32;
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bpdu.cbu_bridgeaddr[2] = cu->cu_rootid >> 24;
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bpdu.cbu_bridgeaddr[3] = cu->cu_rootid >> 16;
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bpdu.cbu_bridgeaddr[4] = cu->cu_rootid >> 8;
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bpdu.cbu_bridgeaddr[5] = cu->cu_rootid >> 0;
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bpdu.cbu_portid = htons(cu->cu_port_id);
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bpdu.cbu_messageage = htons(cu->cu_message_age);
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bpdu.cbu_maxage = htons(cu->cu_max_age);
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bpdu.cbu_hellotime = htons(cu->cu_hello_time);
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bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay);
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memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
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memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
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eh->ether_type = htons(sizeof(bpdu));
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memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
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/* XXX: safe here?!? */
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BRIDGE_UNLOCK(sc);
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bridge_enqueue(sc, ifp, m);
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BRIDGE_LOCK(sc);
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}
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int
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bstp_root_bridge(struct bridge_softc *sc)
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{
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return (sc->sc_designated_root == sc->sc_bridge_id);
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}
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int
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bstp_supersedes_port_info(struct bridge_softc *sc, struct bridge_iflist *bif,
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struct bstp_config_unit *cu)
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{
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if (cu->cu_rootid < bif->bif_designated_root)
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return (1);
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if (cu->cu_rootid > bif->bif_designated_root)
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return (0);
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if (cu->cu_root_path_cost < bif->bif_designated_cost)
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return (1);
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if (cu->cu_root_path_cost > bif->bif_designated_cost)
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return (0);
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if (cu->cu_bridge_id < bif->bif_designated_bridge)
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return (1);
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if (cu->cu_bridge_id > bif->bif_designated_bridge)
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return (0);
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if (sc->sc_bridge_id != cu->cu_bridge_id)
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return (1);
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if (cu->cu_port_id <= bif->bif_designated_port)
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return (1);
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return (0);
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}
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void
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bstp_record_config_information(struct bridge_softc *sc,
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struct bridge_iflist *bif, struct bstp_config_unit *cu)
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{
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bif->bif_designated_root = cu->cu_rootid;
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bif->bif_designated_cost = cu->cu_root_path_cost;
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bif->bif_designated_bridge = cu->cu_bridge_id;
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bif->bif_designated_port = cu->cu_port_id;
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bstp_timer_start(&bif->bif_message_age_timer, cu->cu_message_age);
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}
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void
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bstp_record_config_timeout_values(struct bridge_softc *sc,
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struct bstp_config_unit *config)
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{
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sc->sc_max_age = config->cu_max_age;
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sc->sc_hello_time = config->cu_hello_time;
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sc->sc_forward_delay = config->cu_forward_delay;
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sc->sc_topology_change = config->cu_topology_change;
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}
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void
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bstp_config_bpdu_generation(struct bridge_softc *sc)
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{
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struct bridge_iflist *bif;
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LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
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if ((bif->bif_flags & IFBIF_STP) == 0)
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continue;
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if (bstp_designated_port(sc, bif) &&
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(bif->bif_state != BSTP_IFSTATE_DISABLED))
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bstp_transmit_config(sc, bif);
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}
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}
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int
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bstp_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
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{
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return ((bif->bif_designated_bridge == sc->sc_bridge_id)
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&& (bif->bif_designated_port == bif->bif_port_id));
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}
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void
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bstp_transmit_tcn(struct bridge_softc *sc)
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{
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struct bstp_tbpdu bpdu;
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struct bridge_iflist *bif = sc->sc_root_port;
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struct ifnet *ifp = bif->bif_ifp;
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struct ether_header *eh;
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struct mbuf *m;
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BRIDGE_LOCK_ASSERT(sc);
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if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
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return;
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MGETHDR(m, M_DONTWAIT, MT_DATA);
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if (m == NULL)
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return;
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m->m_pkthdr.rcvif = ifp;
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m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
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m->m_len = m->m_pkthdr.len;
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eh = mtod(m, struct ether_header *);
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memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
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memcpy(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN);
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eh->ether_type = htons(sizeof(bpdu));
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bpdu.tbu_ssap = bpdu.tbu_dsap = LLC_8021D_LSAP;
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bpdu.tbu_ctl = LLC_UI;
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bpdu.tbu_protoid = 0;
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bpdu.tbu_protover = 0;
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bpdu.tbu_bpdutype = BSTP_MSGTYPE_TCN;
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memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
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/* XXX: safe here?!? */
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BRIDGE_UNLOCK(sc);
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bridge_enqueue(sc, ifp, m);
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BRIDGE_LOCK(sc);
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}
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|
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void
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bstp_configuration_update(struct bridge_softc *sc)
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{
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BRIDGE_LOCK_ASSERT(sc);
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bstp_root_selection(sc);
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bstp_designated_port_selection(sc);
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}
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void
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bstp_root_selection(struct bridge_softc *sc)
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{
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struct bridge_iflist *root_port = NULL, *bif;
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BRIDGE_LOCK_ASSERT(sc);
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|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bstp_designated_port(sc, bif))
|
|
continue;
|
|
if (bif->bif_state == BSTP_IFSTATE_DISABLED)
|
|
continue;
|
|
if (bif->bif_designated_root >= sc->sc_bridge_id)
|
|
continue;
|
|
if (root_port == NULL)
|
|
goto set_port;
|
|
|
|
if (bif->bif_designated_root < root_port->bif_designated_root)
|
|
goto set_port;
|
|
if (bif->bif_designated_root > root_port->bif_designated_root)
|
|
continue;
|
|
|
|
if ((bif->bif_designated_cost + bif->bif_path_cost) <
|
|
(root_port->bif_designated_cost + root_port->bif_path_cost))
|
|
goto set_port;
|
|
if ((bif->bif_designated_cost + bif->bif_path_cost) >
|
|
(root_port->bif_designated_cost + root_port->bif_path_cost))
|
|
continue;
|
|
|
|
if (bif->bif_designated_bridge <
|
|
root_port->bif_designated_bridge)
|
|
goto set_port;
|
|
if (bif->bif_designated_bridge >
|
|
root_port->bif_designated_bridge)
|
|
continue;
|
|
|
|
if (bif->bif_designated_port < root_port->bif_designated_port)
|
|
goto set_port;
|
|
if (bif->bif_designated_port > root_port->bif_designated_port)
|
|
continue;
|
|
|
|
if (bif->bif_port_id >= root_port->bif_port_id)
|
|
continue;
|
|
set_port:
|
|
root_port = bif;
|
|
}
|
|
|
|
sc->sc_root_port = root_port;
|
|
if (root_port == NULL) {
|
|
sc->sc_designated_root = sc->sc_bridge_id;
|
|
sc->sc_root_path_cost = 0;
|
|
} else {
|
|
sc->sc_designated_root = root_port->bif_designated_root;
|
|
sc->sc_root_path_cost = root_port->bif_designated_cost +
|
|
root_port->bif_path_cost;
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_designated_port_selection(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bstp_designated_port(sc, bif))
|
|
goto designated;
|
|
if (bif->bif_designated_root != sc->sc_designated_root)
|
|
goto designated;
|
|
|
|
if (sc->sc_root_path_cost < bif->bif_designated_cost)
|
|
goto designated;
|
|
if (sc->sc_root_path_cost > bif->bif_designated_cost)
|
|
continue;
|
|
|
|
if (sc->sc_bridge_id < bif->bif_designated_bridge)
|
|
goto designated;
|
|
if (sc->sc_bridge_id > bif->bif_designated_bridge)
|
|
continue;
|
|
|
|
if (bif->bif_port_id > bif->bif_designated_port)
|
|
continue;
|
|
designated:
|
|
bstp_become_designated_port(sc, bif);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_become_designated_port(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
bif->bif_designated_root = sc->sc_designated_root;
|
|
bif->bif_designated_cost = sc->sc_root_path_cost;
|
|
bif->bif_designated_bridge = sc->sc_bridge_id;
|
|
bif->bif_designated_port = bif->bif_port_id;
|
|
}
|
|
|
|
void
|
|
bstp_port_state_selection(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bif == sc->sc_root_port) {
|
|
bif->bif_config_pending = 0;
|
|
bif->bif_topology_change_acknowledge = 0;
|
|
bstp_make_forwarding(sc, bif);
|
|
} else if (bstp_designated_port(sc, bif)) {
|
|
bstp_timer_stop(&bif->bif_message_age_timer);
|
|
bstp_make_forwarding(sc, bif);
|
|
} else {
|
|
bif->bif_config_pending = 0;
|
|
bif->bif_topology_change_acknowledge = 0;
|
|
bstp_make_blocking(sc, bif);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_make_forwarding(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
if (bif->bif_state == BSTP_IFSTATE_BLOCKING) {
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_LISTENING);
|
|
bstp_timer_start(&bif->bif_forward_delay_timer, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_make_blocking(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
if ((bif->bif_state != BSTP_IFSTATE_DISABLED) &&
|
|
(bif->bif_state != BSTP_IFSTATE_BLOCKING)) {
|
|
if ((bif->bif_state == BSTP_IFSTATE_FORWARDING) ||
|
|
(bif->bif_state == BSTP_IFSTATE_LEARNING)) {
|
|
if (bif->bif_change_detection_enabled) {
|
|
bstp_topology_change_detection(sc);
|
|
}
|
|
}
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
|
|
bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
|
|
bstp_timer_stop(&bif->bif_forward_delay_timer);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_set_port_state(struct bridge_iflist *bif, uint8_t state)
|
|
{
|
|
bif->bif_state = state;
|
|
}
|
|
|
|
void
|
|
bstp_topology_change_detection(struct bridge_softc *sc)
|
|
{
|
|
if (bstp_root_bridge(sc)) {
|
|
sc->sc_topology_change = 1;
|
|
bstp_timer_start(&sc->sc_topology_change_timer, 0);
|
|
} else if (!sc->sc_topology_change_detected) {
|
|
bstp_transmit_tcn(sc);
|
|
bstp_timer_start(&sc->sc_tcn_timer, 0);
|
|
}
|
|
sc->sc_topology_change_detected = 1;
|
|
}
|
|
|
|
void
|
|
bstp_topology_change_acknowledged(struct bridge_softc *sc)
|
|
{
|
|
sc->sc_topology_change_detected = 0;
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
}
|
|
|
|
void
|
|
bstp_acknowledge_topology_change(struct bridge_softc *sc,
|
|
struct bridge_iflist *bif)
|
|
{
|
|
bif->bif_topology_change_acknowledge = 1;
|
|
bstp_transmit_config(sc, bif);
|
|
}
|
|
|
|
struct mbuf *
|
|
bstp_input(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct bridge_softc *sc = ifp->if_bridge;
|
|
struct bridge_iflist *bif = NULL;
|
|
struct ether_header *eh;
|
|
struct bstp_tbpdu tpdu;
|
|
struct bstp_cbpdu cpdu;
|
|
struct bstp_config_unit cu;
|
|
struct bstp_tcn_unit tu;
|
|
uint16_t len;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bif->bif_ifp == ifp)
|
|
break;
|
|
}
|
|
if (bif == NULL)
|
|
goto out;
|
|
|
|
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));
|
|
|
|
if (tpdu.tbu_dsap != LLC_8021D_LSAP ||
|
|
tpdu.tbu_ssap != LLC_8021D_LSAP ||
|
|
tpdu.tbu_ctl != LLC_UI)
|
|
goto out;
|
|
if (tpdu.tbu_protoid != 0 || tpdu.tbu_protover != 0)
|
|
goto out;
|
|
|
|
switch (tpdu.tbu_bpdutype) {
|
|
case BSTP_MSGTYPE_TCN:
|
|
tu.tu_message_type = tpdu.tbu_bpdutype;
|
|
bstp_received_tcn_bpdu(sc, bif, &tu);
|
|
break;
|
|
case BSTP_MSGTYPE_CFG:
|
|
if (m->m_len < sizeof(cpdu) &&
|
|
(m = m_pullup(m, sizeof(cpdu))) == NULL)
|
|
goto out;
|
|
memcpy(&cpdu, mtod(m, caddr_t), sizeof(cpdu));
|
|
|
|
cu.cu_rootid =
|
|
(((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_bridge_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_root_path_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_port_id = ntohs(cpdu.cbu_portid);
|
|
cu.cu_message_type = cpdu.cbu_bpdutype;
|
|
cu.cu_topology_change_acknowledgment =
|
|
(cpdu.cbu_flags & BSTP_FLAG_TCA) ? 1 : 0;
|
|
cu.cu_topology_change =
|
|
(cpdu.cbu_flags & BSTP_FLAG_TC) ? 1 : 0;
|
|
bstp_received_config_bpdu(sc, bif, &cu);
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (m)
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
bstp_received_config_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
|
|
struct bstp_config_unit *cu)
|
|
{
|
|
int root;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
root = bstp_root_bridge(sc);
|
|
|
|
if (bif->bif_state != BSTP_IFSTATE_DISABLED) {
|
|
if (bstp_supersedes_port_info(sc, bif, cu)) {
|
|
bstp_record_config_information(sc, bif, cu);
|
|
bstp_configuration_update(sc);
|
|
bstp_port_state_selection(sc);
|
|
|
|
if ((bstp_root_bridge(sc) == 0) && root) {
|
|
bstp_timer_stop(&sc->sc_hello_timer);
|
|
|
|
if (sc->sc_topology_change_detected) {
|
|
bstp_timer_stop(
|
|
&sc->sc_topology_change_timer);
|
|
bstp_transmit_tcn(sc);
|
|
bstp_timer_start(&sc->sc_tcn_timer, 0);
|
|
}
|
|
}
|
|
|
|
if (bif == sc->sc_root_port) {
|
|
bstp_record_config_timeout_values(sc, cu);
|
|
bstp_config_bpdu_generation(sc);
|
|
|
|
if (cu->cu_topology_change_acknowledgment)
|
|
bstp_topology_change_acknowledged(sc);
|
|
}
|
|
} else if (bstp_designated_port(sc, bif))
|
|
bstp_transmit_config(sc, bif);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_received_tcn_bpdu(struct bridge_softc *sc, struct bridge_iflist *bif,
|
|
struct bstp_tcn_unit *tcn)
|
|
{
|
|
if (bif->bif_state != BSTP_IFSTATE_DISABLED &&
|
|
bstp_designated_port(sc, bif)) {
|
|
bstp_topology_change_detection(sc);
|
|
bstp_acknowledge_topology_change(sc, bif);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_hello_timer_expiry(struct bridge_softc *sc)
|
|
{
|
|
bstp_config_bpdu_generation(sc);
|
|
bstp_timer_start(&sc->sc_hello_timer, 0);
|
|
}
|
|
|
|
void
|
|
bstp_message_age_timer_expiry(struct bridge_softc *sc,
|
|
struct bridge_iflist *bif)
|
|
{
|
|
int root;
|
|
|
|
root = bstp_root_bridge(sc);
|
|
bstp_become_designated_port(sc, bif);
|
|
bstp_configuration_update(sc);
|
|
bstp_port_state_selection(sc);
|
|
|
|
if ((bstp_root_bridge(sc)) && (root == 0)) {
|
|
sc->sc_max_age = sc->sc_bridge_max_age;
|
|
sc->sc_hello_time = sc->sc_bridge_hello_time;
|
|
sc->sc_forward_delay = sc->sc_bridge_forward_delay;
|
|
|
|
bstp_topology_change_detection(sc);
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
bstp_config_bpdu_generation(sc);
|
|
bstp_timer_start(&sc->sc_hello_timer, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_forward_delay_timer_expiry(struct bridge_softc *sc,
|
|
struct bridge_iflist *bif)
|
|
{
|
|
if (bif->bif_state == BSTP_IFSTATE_LISTENING) {
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_LEARNING);
|
|
bstp_timer_start(&bif->bif_forward_delay_timer, 0);
|
|
} else if (bif->bif_state == BSTP_IFSTATE_LEARNING) {
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_FORWARDING);
|
|
if (bstp_designated_for_some_port(sc) &&
|
|
bif->bif_change_detection_enabled)
|
|
bstp_topology_change_detection(sc);
|
|
}
|
|
}
|
|
|
|
int
|
|
bstp_designated_for_some_port(struct bridge_softc *sc)
|
|
{
|
|
|
|
struct bridge_iflist *bif;
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bif->bif_designated_bridge == sc->sc_bridge_id)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
bstp_tcn_timer_expiry(struct bridge_softc *sc)
|
|
{
|
|
bstp_transmit_tcn(sc);
|
|
bstp_timer_start(&sc->sc_tcn_timer, 0);
|
|
}
|
|
|
|
void
|
|
bstp_topology_change_timer_expiry(struct bridge_softc *sc)
|
|
{
|
|
sc->sc_topology_change_detected = 0;
|
|
sc->sc_topology_change = 0;
|
|
}
|
|
|
|
void
|
|
bstp_hold_timer_expiry(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
if (bif->bif_config_pending)
|
|
bstp_transmit_config(sc, bif);
|
|
}
|
|
|
|
void
|
|
bstp_initialization(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_iflist *bif, *mif;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
mif = NULL;
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bif->bif_ifp->if_type != IFT_ETHER)
|
|
continue;
|
|
bif->bif_port_id = (bif->bif_priority << 8) |
|
|
(bif->bif_ifp->if_index & 0xff);
|
|
|
|
if (mif == NULL) {
|
|
mif = bif;
|
|
continue;
|
|
}
|
|
if (memcmp(IF_LLADDR(bif->bif_ifp),
|
|
IF_LLADDR(mif->bif_ifp), ETHER_ADDR_LEN) < 0) {
|
|
mif = bif;
|
|
continue;
|
|
}
|
|
}
|
|
if (mif == NULL) {
|
|
bstp_stop(sc);
|
|
return;
|
|
}
|
|
|
|
sc->sc_bridge_id =
|
|
(((uint64_t)sc->sc_bridge_priority) << 48) |
|
|
(((uint64_t)IF_LLADDR(mif->bif_ifp)[0]) << 40) |
|
|
(((uint64_t)IF_LLADDR(mif->bif_ifp)[1]) << 32) |
|
|
(IF_LLADDR(mif->bif_ifp)[2] << 24) |
|
|
(IF_LLADDR(mif->bif_ifp)[3] << 16) |
|
|
(IF_LLADDR(mif->bif_ifp)[4] << 8) |
|
|
(IF_LLADDR(mif->bif_ifp)[5]);
|
|
|
|
sc->sc_designated_root = sc->sc_bridge_id;
|
|
sc->sc_root_path_cost = 0;
|
|
sc->sc_root_port = NULL;
|
|
|
|
sc->sc_max_age = sc->sc_bridge_max_age;
|
|
sc->sc_hello_time = sc->sc_bridge_hello_time;
|
|
sc->sc_forward_delay = sc->sc_bridge_forward_delay;
|
|
sc->sc_topology_change_detected = 0;
|
|
sc->sc_topology_change = 0;
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
bstp_timer_stop(&sc->sc_topology_change_timer);
|
|
|
|
if (callout_pending(&sc->sc_bstpcallout) == 0)
|
|
callout_reset(&sc->sc_bstpcallout, hz,
|
|
bstp_tick, sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if (bif->bif_flags & IFBIF_STP)
|
|
bstp_enable_port(sc, bif);
|
|
else
|
|
bstp_disable_port(sc, bif);
|
|
}
|
|
|
|
bstp_port_state_selection(sc);
|
|
bstp_config_bpdu_generation(sc);
|
|
bstp_timer_start(&sc->sc_hello_timer, 0);
|
|
}
|
|
|
|
void
|
|
bstp_stop(struct bridge_softc *sc)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
|
|
bstp_timer_stop(&bif->bif_hold_timer);
|
|
bstp_timer_stop(&bif->bif_message_age_timer);
|
|
bstp_timer_stop(&bif->bif_forward_delay_timer);
|
|
}
|
|
|
|
callout_stop(&sc->sc_bstpcallout);
|
|
|
|
bstp_timer_stop(&sc->sc_topology_change_timer);
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
bstp_timer_stop(&sc->sc_hello_timer);
|
|
|
|
}
|
|
|
|
void
|
|
bstp_initialize_port(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
bstp_become_designated_port(sc, bif);
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
|
|
bif->bif_topology_change_acknowledge = 0;
|
|
bif->bif_config_pending = 0;
|
|
bif->bif_change_detection_enabled = 1;
|
|
bstp_timer_stop(&bif->bif_message_age_timer);
|
|
bstp_timer_stop(&bif->bif_forward_delay_timer);
|
|
bstp_timer_stop(&bif->bif_hold_timer);
|
|
}
|
|
|
|
void
|
|
bstp_enable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
bstp_initialize_port(sc, bif);
|
|
bstp_port_state_selection(sc);
|
|
}
|
|
|
|
void
|
|
bstp_disable_port(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
int root;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
root = bstp_root_bridge(sc);
|
|
bstp_become_designated_port(sc, bif);
|
|
bstp_set_port_state(bif, BSTP_IFSTATE_DISABLED);
|
|
bif->bif_topology_change_acknowledge = 0;
|
|
bif->bif_config_pending = 0;
|
|
bstp_timer_stop(&bif->bif_message_age_timer);
|
|
bstp_timer_stop(&bif->bif_forward_delay_timer);
|
|
bstp_configuration_update(sc);
|
|
bstp_port_state_selection(sc);
|
|
bridge_rtdelete(sc, bif->bif_ifp, IFBF_FLUSHDYN);
|
|
|
|
if (bstp_root_bridge(sc) && (root == 0)) {
|
|
sc->sc_max_age = sc->sc_bridge_max_age;
|
|
sc->sc_hello_time = sc->sc_bridge_hello_time;
|
|
sc->sc_forward_delay = sc->sc_bridge_forward_delay;
|
|
|
|
bstp_topology_change_detection(sc);
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
bstp_config_bpdu_generation(sc);
|
|
bstp_timer_start(&sc->sc_hello_timer, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_set_bridge_priority(struct bridge_softc *sc, uint64_t new_bridge_id)
|
|
{
|
|
struct bridge_iflist *bif;
|
|
int root;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
root = bstp_root_bridge(sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bstp_designated_port(sc, bif))
|
|
bif->bif_designated_bridge = new_bridge_id;
|
|
}
|
|
|
|
sc->sc_bridge_id = new_bridge_id;
|
|
|
|
bstp_configuration_update(sc);
|
|
bstp_port_state_selection(sc);
|
|
|
|
if (bstp_root_bridge(sc) && (root == 0)) {
|
|
sc->sc_max_age = sc->sc_bridge_max_age;
|
|
sc->sc_hello_time = sc->sc_bridge_hello_time;
|
|
sc->sc_forward_delay = sc->sc_bridge_forward_delay;
|
|
|
|
bstp_topology_change_detection(sc);
|
|
bstp_timer_stop(&sc->sc_tcn_timer);
|
|
bstp_config_bpdu_generation(sc);
|
|
bstp_timer_start(&sc->sc_hello_timer, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_set_port_priority(struct bridge_softc *sc, struct bridge_iflist *bif,
|
|
uint16_t new_port_id)
|
|
{
|
|
if (bstp_designated_port(sc, bif))
|
|
bif->bif_designated_port = new_port_id;
|
|
|
|
bif->bif_port_id = new_port_id;
|
|
|
|
if ((sc->sc_bridge_id == bif->bif_designated_bridge) &&
|
|
(bif->bif_port_id < bif->bif_designated_port)) {
|
|
bstp_become_designated_port(sc, bif);
|
|
bstp_port_state_selection(sc);
|
|
}
|
|
}
|
|
|
|
void
|
|
bstp_set_path_cost(struct bridge_softc *sc, struct bridge_iflist *bif,
|
|
uint32_t path_cost)
|
|
{
|
|
bif->bif_path_cost = path_cost;
|
|
bstp_configuration_update(sc);
|
|
bstp_port_state_selection(sc);
|
|
}
|
|
|
|
void
|
|
bstp_enable_change_detection(struct bridge_iflist *bif)
|
|
{
|
|
bif->bif_change_detection_enabled = 1;
|
|
}
|
|
|
|
void
|
|
bstp_disable_change_detection(struct bridge_iflist *bif)
|
|
{
|
|
bif->bif_change_detection_enabled = 0;
|
|
}
|
|
|
|
void
|
|
bstp_linkstate(struct ifnet *ifp, int state)
|
|
{
|
|
struct bridge_softc *sc;
|
|
struct bridge_iflist *bif;
|
|
|
|
sc = ifp->if_bridge;
|
|
BRIDGE_LOCK(sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
|
|
if (bif->bif_ifp == ifp) {
|
|
bstp_ifupdstatus(sc, bif);
|
|
break;
|
|
}
|
|
}
|
|
|
|
BRIDGE_UNLOCK(sc);
|
|
}
|
|
|
|
void
|
|
bstp_ifupdstatus(struct bridge_softc *sc, struct bridge_iflist *bif)
|
|
{
|
|
struct ifnet *ifp = bif->bif_ifp;
|
|
struct ifmediareq ifmr;
|
|
int error = 0;
|
|
|
|
BRIDGE_LOCK_ASSERT(sc);
|
|
|
|
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) {
|
|
if (bif->bif_state == BSTP_IFSTATE_DISABLED)
|
|
bstp_enable_port(sc, bif);
|
|
|
|
} else {
|
|
if (bif->bif_state != BSTP_IFSTATE_DISABLED)
|
|
bstp_disable_port(sc, bif);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (bif->bif_state != BSTP_IFSTATE_DISABLED)
|
|
bstp_disable_port(sc, bif);
|
|
}
|
|
|
|
void
|
|
bstp_tick(void *arg)
|
|
{
|
|
struct bridge_softc *sc = arg;
|
|
struct bridge_iflist *bif;
|
|
|
|
BRIDGE_LOCK(sc);
|
|
|
|
#if 0
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
/*
|
|
* XXX This can cause a lag in "link does away"
|
|
* XXX and "spanning tree gets updated". We need
|
|
* XXX come sort of callback from the link state
|
|
* XXX update code to kick spanning tree.
|
|
* XXX --thorpej@NetBSD.org
|
|
*/
|
|
bstp_ifupdstatus(sc, bif);
|
|
}
|
|
#endif
|
|
|
|
if (bstp_timer_expired(&sc->sc_hello_timer, sc->sc_hello_time))
|
|
bstp_hello_timer_expiry(sc);
|
|
|
|
if (bstp_timer_expired(&sc->sc_tcn_timer, sc->sc_bridge_hello_time))
|
|
bstp_tcn_timer_expiry(sc);
|
|
|
|
if (bstp_timer_expired(&sc->sc_topology_change_timer,
|
|
sc->sc_topology_change_time))
|
|
bstp_topology_change_timer_expiry(sc);
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bstp_timer_expired(&bif->bif_message_age_timer,
|
|
sc->sc_max_age))
|
|
bstp_message_age_timer_expiry(sc, bif);
|
|
}
|
|
|
|
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
|
|
if ((bif->bif_flags & IFBIF_STP) == 0)
|
|
continue;
|
|
if (bstp_timer_expired(&bif->bif_forward_delay_timer,
|
|
sc->sc_forward_delay))
|
|
bstp_forward_delay_timer_expiry(sc, bif);
|
|
|
|
if (bstp_timer_expired(&bif->bif_hold_timer,
|
|
sc->sc_hold_time))
|
|
bstp_hold_timer_expiry(sc, bif);
|
|
}
|
|
|
|
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
|
|
callout_reset(&sc->sc_bstpcallout, hz, bstp_tick, sc);
|
|
|
|
BRIDGE_UNLOCK(sc);
|
|
}
|
|
|
|
void
|
|
bstp_timer_start(struct bridge_timer *t, uint16_t v)
|
|
{
|
|
t->value = v;
|
|
t->active = 1;
|
|
}
|
|
|
|
void
|
|
bstp_timer_stop(struct bridge_timer *t)
|
|
{
|
|
t->value = 0;
|
|
t->active = 0;
|
|
}
|
|
|
|
int
|
|
bstp_timer_expired(struct bridge_timer *t, uint16_t v)
|
|
{
|
|
if (t->active == 0)
|
|
return (0);
|
|
t->value += BSTP_TICK_VAL;
|
|
if (t->value >= v) {
|
|
bstp_timer_stop(t);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
|
|
}
|