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96e47153ea
freebsd-nq/sys/net/bridgestp.c
Andrew Thompson 96e47153ea /tmp/cvsuusTrc
2006-07-26 10:43:02 +00:00

1267 lines
32 KiB
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/* $NetBSD: bridgestp.c,v 1.5 2003/11/28 08:56:48 keihan Exp $ */
/*
* Copyright (c) 2000 Jason L. Wright (jason@thought.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jason L. Wright
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* OpenBSD: bridgestp.c,v 1.5 2001/03/22 03:48:29 jason Exp
*/
/*
* Implementation of the spanning tree protocol as defined in
* ISO/IEC Final DIS 15802-3 (IEEE P802.1D/D17), May 25, 1998.
* (In English: IEEE 802.1D, Draft 17, 1998)
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/callout.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_llc.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <net/bridgestp.h>
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_initialize_port(struct bstp_state *,
struct bstp_port *);
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 *);
#ifdef notused
static void bstp_enable_change_detection(struct bstp_port *);
static void bstp_disable_change_detection(struct bstp_port *);
#endif /* notused */
static int bstp_root_bridge(struct bstp_state *bs);
static int bstp_supersedes_port_info(struct bstp_state *,
struct bstp_port *, struct bstp_config_unit *);
static int bstp_designated_port(struct bstp_state *,
struct bstp_port *);
static int bstp_designated_for_some_port(struct bstp_state *);
static void bstp_transmit_config(struct bstp_state *,
struct bstp_port *);
static void bstp_transmit_tcn(struct bstp_state *);
static void bstp_received_config_bpdu(struct bstp_state *,
struct bstp_port *, struct bstp_config_unit *);
static void bstp_received_tcn_bpdu(struct bstp_state *,
struct bstp_port *, struct bstp_tcn_unit *);
static void bstp_record_config_information(struct bstp_state *,
struct bstp_port *, struct bstp_config_unit *);
static void bstp_record_config_timeout_values(struct bstp_state *,
struct bstp_config_unit *);
static void bstp_config_bpdu_generation(struct bstp_state *);
static void bstp_send_config_bpdu(struct bstp_state *,
struct bstp_port *, struct bstp_config_unit *);
static void bstp_configuration_update(struct bstp_state *);
static void bstp_root_selection(struct bstp_state *);
static void bstp_designated_port_selection(struct bstp_state *);
static void bstp_become_designated_port(struct bstp_state *,
struct bstp_port *);
static void bstp_port_state_selection(struct bstp_state *);
static void bstp_make_forwarding(struct bstp_state *,
struct bstp_port *);
static void bstp_make_blocking(struct bstp_state *,
struct bstp_port *);
static void bstp_set_port_state(struct bstp_port *, uint8_t);
#ifdef notused
static void bstp_set_bridge_priority(struct bstp_state *, uint64_t);
static void bstp_set_port_priority(struct bstp_state *,
struct bstp_port *, uint16_t);
static void bstp_set_path_cost(struct bstp_state *,
struct bstp_port *, uint32_t);
#endif /* notused */
static void bstp_topology_change_detection(struct bstp_state *);
static void bstp_topology_change_acknowledged(struct bstp_state *);
static void bstp_acknowledge_topology_change(struct bstp_state *,
struct bstp_port *);
static void bstp_enqueue(struct ifnet *, struct mbuf *);
static void bstp_tick(void *);
static void bstp_timer_start(struct bstp_timer *, uint16_t);
static void bstp_timer_stop(struct bstp_timer *);
static int bstp_timer_expired(struct bstp_timer *, uint16_t);
static void bstp_hold_timer_expiry(struct bstp_state *,
struct bstp_port *);
static void bstp_message_age_timer_expiry(struct bstp_state *,
struct bstp_port *);
static void bstp_forward_delay_timer_expiry(struct bstp_state *,
struct bstp_port *);
static void bstp_topology_change_timer_expiry(struct bstp_state *);
static void bstp_tcn_timer_expiry(struct bstp_state *);
static void bstp_hello_timer_expiry(struct bstp_state *);
static int bstp_addr_cmp(const uint8_t *, const uint8_t *);
static void
bstp_transmit_config(struct bstp_state *bs, struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
if (bp->bp_hold_timer.active) {
bp->bp_config_pending = 1;
return;
}
bp->bp_config_bpdu.cu_message_type = BSTP_MSGTYPE_CFG;
bp->bp_config_bpdu.cu_rootid = bs->bs_designated_root;
bp->bp_config_bpdu.cu_root_path_cost = bs->bs_root_path_cost;
bp->bp_config_bpdu.cu_bridge_id = bs->bs_bridge_id;
bp->bp_config_bpdu.cu_port_id = bp->bp_port_id;
if (bstp_root_bridge(bs))
bp->bp_config_bpdu.cu_message_age = 0;
else
bp->bp_config_bpdu.cu_message_age =
bs->bs_root_port->bp_message_age_timer.value +
BSTP_MESSAGE_AGE_INCR;
bp->bp_config_bpdu.cu_max_age = bs->bs_max_age;
bp->bp_config_bpdu.cu_hello_time = bs->bs_hello_time;
bp->bp_config_bpdu.cu_forward_delay = bs->bs_forward_delay;
bp->bp_config_bpdu.cu_topology_change_acknowledgment
= bp->bp_topology_change_acknowledge;
bp->bp_config_bpdu.cu_topology_change = bs->bs_topology_change;
if (bp->bp_config_bpdu.cu_message_age < bs->bs_max_age) {
bp->bp_topology_change_acknowledge = 0;
bp->bp_config_pending = 0;
bstp_send_config_bpdu(bs, bp, &bp->bp_config_bpdu);
bstp_timer_start(&bp->bp_hold_timer, 0);
}
}
static void
bstp_send_config_bpdu(struct bstp_state *bs, struct bstp_port *bp,
struct bstp_config_unit *cu)
{
struct ifnet *ifp;
struct mbuf *m;
struct ether_header *eh;
struct bstp_cbpdu bpdu;
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 *);
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = sizeof(*eh) + sizeof(bpdu);
m->m_len = m->m_pkthdr.len;
bpdu.cbu_ssap = bpdu.cbu_dsap = LLC_8021D_LSAP;
bpdu.cbu_ctl = LLC_UI;
bpdu.cbu_protoid = htons(0);
bpdu.cbu_protover = 0;
bpdu.cbu_bpdutype = cu->cu_message_type;
bpdu.cbu_flags = (cu->cu_topology_change ? BSTP_FLAG_TC : 0) |
(cu->cu_topology_change_acknowledgment ? BSTP_FLAG_TCA : 0);
bpdu.cbu_rootpri = htons(cu->cu_rootid >> 48);
bpdu.cbu_rootaddr[0] = cu->cu_rootid >> 40;
bpdu.cbu_rootaddr[1] = cu->cu_rootid >> 32;
bpdu.cbu_rootaddr[2] = cu->cu_rootid >> 24;
bpdu.cbu_rootaddr[3] = cu->cu_rootid >> 16;
bpdu.cbu_rootaddr[4] = cu->cu_rootid >> 8;
bpdu.cbu_rootaddr[5] = cu->cu_rootid >> 0;
bpdu.cbu_rootpathcost = htonl(cu->cu_root_path_cost);
bpdu.cbu_bridgepri = htons(cu->cu_bridge_id >> 48);
bpdu.cbu_bridgeaddr[0] = cu->cu_bridge_id >> 40;
bpdu.cbu_bridgeaddr[1] = cu->cu_bridge_id >> 32;
bpdu.cbu_bridgeaddr[2] = cu->cu_bridge_id >> 24;
bpdu.cbu_bridgeaddr[3] = cu->cu_bridge_id >> 16;
bpdu.cbu_bridgeaddr[4] = cu->cu_bridge_id >> 8;
bpdu.cbu_bridgeaddr[5] = cu->cu_bridge_id >> 0;
bpdu.cbu_portid = htons(cu->cu_port_id);
bpdu.cbu_messageage = htons(cu->cu_message_age);
bpdu.cbu_maxage = htons(cu->cu_max_age);
bpdu.cbu_hellotime = htons(cu->cu_hello_time);
bpdu.cbu_forwarddelay = htons(cu->cu_forward_delay);
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));
memcpy(mtod(m, caddr_t) + sizeof(*eh), &bpdu, sizeof(bpdu));
bstp_enqueue(ifp, m);
}
static int
bstp_root_bridge(struct bstp_state *bs)
{
return (bs->bs_designated_root == bs->bs_bridge_id);
}
static int
bstp_supersedes_port_info(struct bstp_state *bs, struct bstp_port *bp,
struct bstp_config_unit *cu)
{
if (cu->cu_rootid < bp->bp_designated_root)
return (1);
if (cu->cu_rootid > bp->bp_designated_root)
return (0);
if (cu->cu_root_path_cost < bp->bp_designated_cost)
return (1);
if (cu->cu_root_path_cost > bp->bp_designated_cost)
return (0);
if (cu->cu_bridge_id < bp->bp_designated_bridge)
return (1);
if (cu->cu_bridge_id > bp->bp_designated_bridge)
return (0);
if (bs->bs_bridge_id != cu->cu_bridge_id)
return (1);
if (cu->cu_port_id <= bp->bp_designated_port)
return (1);
return (0);
}
static void
bstp_record_config_information(struct bstp_state *bs,
struct bstp_port *bp, struct bstp_config_unit *cu)
{
BSTP_LOCK_ASSERT(bs);
bp->bp_designated_root = cu->cu_rootid;
bp->bp_designated_cost = cu->cu_root_path_cost;
bp->bp_designated_bridge = cu->cu_bridge_id;
bp->bp_designated_port = cu->cu_port_id;
bstp_timer_start(&bp->bp_message_age_timer, cu->cu_message_age);
}
static void
bstp_record_config_timeout_values(struct bstp_state *bs,
struct bstp_config_unit *config)
{
BSTP_LOCK_ASSERT(bs);
bs->bs_max_age = config->cu_max_age;
bs->bs_hello_time = config->cu_hello_time;
bs->bs_forward_delay = config->cu_forward_delay;
bs->bs_topology_change = config->cu_topology_change;
}
static void
bstp_config_bpdu_generation(struct bstp_state *bs)
{
struct bstp_port *bp;
BSTP_LOCK_ASSERT(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_designated_port(bs, bp) &&
(bp->bp_state != BSTP_IFSTATE_DISABLED))
bstp_transmit_config(bs, bp);
}
}
static int
bstp_designated_port(struct bstp_state *bs, struct bstp_port *bp)
{
return ((bp->bp_designated_bridge == bs->bs_bridge_id)
&& (bp->bp_designated_port == bp->bp_port_id));
}
static void
bstp_transmit_tcn(struct bstp_state *bs)
{
struct bstp_tbpdu bpdu;
struct bstp_port *bp = bs->bs_root_port;
struct ifnet *ifp = bp->bp_ifp;
struct ether_header *eh;
struct mbuf *m;
BSTP_LOCK_ASSERT(bs);
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));
bstp_enqueue(ifp, m);
}
static void
bstp_configuration_update(struct bstp_state *bs)
{
BSTP_LOCK_ASSERT(bs);
bstp_root_selection(bs);
bstp_designated_port_selection(bs);
}
static void
bstp_root_selection(struct bstp_state *bs)
{
struct bstp_port *root_port = NULL, *bp;
BSTP_LOCK_ASSERT(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_designated_port(bs, bp))
continue;
if (bp->bp_state == BSTP_IFSTATE_DISABLED)
continue;
if (bp->bp_designated_root >= bs->bs_bridge_id)
continue;
if (root_port == NULL)
goto set_port;
if (bp->bp_designated_root < root_port->bp_designated_root)
goto set_port;
if (bp->bp_designated_root > root_port->bp_designated_root)
continue;
if ((bp->bp_designated_cost + bp->bp_path_cost) <
(root_port->bp_designated_cost + root_port->bp_path_cost))
goto set_port;
if ((bp->bp_designated_cost + bp->bp_path_cost) >
(root_port->bp_designated_cost + root_port->bp_path_cost))
continue;
if (bp->bp_designated_bridge <
root_port->bp_designated_bridge)
goto set_port;
if (bp->bp_designated_bridge >
root_port->bp_designated_bridge)
continue;
if (bp->bp_designated_port < root_port->bp_designated_port)
goto set_port;
if (bp->bp_designated_port > root_port->bp_designated_port)
continue;
if (bp->bp_port_id >= root_port->bp_port_id)
continue;
set_port:
root_port = bp;
}
bs->bs_root_port = root_port;
if (root_port == NULL) {
bs->bs_designated_root = bs->bs_bridge_id;
bs->bs_root_path_cost = 0;
} else {
bs->bs_designated_root = root_port->bp_designated_root;
bs->bs_root_path_cost = root_port->bp_designated_cost +
root_port->bp_path_cost;
}
}
static void
bstp_designated_port_selection(struct bstp_state *bs)
{
struct bstp_port *bp;
BSTP_LOCK_ASSERT(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_designated_port(bs, bp))
goto designated;
if (bp->bp_designated_root != bs->bs_designated_root)
goto designated;
if (bs->bs_root_path_cost < bp->bp_designated_cost)
goto designated;
if (bs->bs_root_path_cost > bp->bp_designated_cost)
continue;
if (bs->bs_bridge_id < bp->bp_designated_bridge)
goto designated;
if (bs->bs_bridge_id > bp->bp_designated_bridge)
continue;
if (bp->bp_port_id > bp->bp_designated_port)
continue;
designated:
bstp_become_designated_port(bs, bp);
}
}
static void
bstp_become_designated_port(struct bstp_state *bs, struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
bp->bp_designated_root = bs->bs_designated_root;
bp->bp_designated_cost = bs->bs_root_path_cost;
bp->bp_designated_bridge = bs->bs_bridge_id;
bp->bp_designated_port = bp->bp_port_id;
}
static void
bstp_port_state_selection(struct bstp_state *bs)
{
struct bstp_port *bp;
BSTP_LOCK_ASSERT(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bp == bs->bs_root_port) {
bp->bp_config_pending = 0;
bp->bp_topology_change_acknowledge = 0;
bstp_make_forwarding(bs, bp);
} else if (bstp_designated_port(bs, bp)) {
bstp_timer_stop(&bp->bp_message_age_timer);
bstp_make_forwarding(bs, bp);
} else {
bp->bp_config_pending = 0;
bp->bp_topology_change_acknowledge = 0;
bstp_make_blocking(bs, bp);
}
}
}
static void
bstp_make_forwarding(struct bstp_state *bs, struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
if (bp->bp_state == BSTP_IFSTATE_BLOCKING) {
bstp_set_port_state(bp, BSTP_IFSTATE_LISTENING);
bstp_timer_start(&bp->bp_forward_delay_timer, 0);
}
}
static void
bstp_make_blocking(struct bstp_state *bs, struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
if ((bp->bp_state != BSTP_IFSTATE_DISABLED) &&
(bp->bp_state != BSTP_IFSTATE_BLOCKING)) {
if ((bp->bp_state == BSTP_IFSTATE_FORWARDING) ||
(bp->bp_state == BSTP_IFSTATE_LEARNING)) {
if (bp->bp_change_detection_enabled) {
bstp_topology_change_detection(bs);
}
}
bstp_set_port_state(bp, BSTP_IFSTATE_BLOCKING);
/* XXX bridge_rtdelete(bs, bp->bp_ifp, IFBF_FLUSHDYN); */
bstp_timer_stop(&bp->bp_forward_delay_timer);
}
}
static void
bstp_set_port_state(struct bstp_port *bp, uint8_t state)
{
bp->bp_state = state;
}
static void
bstp_topology_change_detection(struct bstp_state *bs)
{
BSTP_LOCK_ASSERT(bs);
if (bstp_root_bridge(bs)) {
bs->bs_topology_change = 1;
bstp_timer_start(&bs->bs_topology_change_timer, 0);
} else if (!bs->bs_topology_change_detected) {
bstp_transmit_tcn(bs);
bstp_timer_start(&bs->bs_tcn_timer, 0);
}
bs->bs_topology_change_detected = 1;
}
static void
bstp_topology_change_acknowledged(struct bstp_state *bs)
{
BSTP_LOCK_ASSERT(bs);
bs->bs_topology_change_detected = 0;
bstp_timer_stop(&bs->bs_tcn_timer);
}
static void
bstp_acknowledge_topology_change(struct bstp_state *bs,
struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
bp->bp_topology_change_acknowledge = 1;
bstp_transmit_config(bs, bp);
}
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;
struct bstp_cbpdu cpdu;
struct bstp_config_unit cu;
struct bstp_tcn_unit tu;
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));
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(bs, bp, &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(bs, bp, &cu);
break;
default:
goto out;
}
out:
BSTP_UNLOCK(bs);
if (m)
m_freem(m);
return (NULL);
}
static void
bstp_received_config_bpdu(struct bstp_state *bs, struct bstp_port *bp,
struct bstp_config_unit *cu)
{
int root;
BSTP_LOCK_ASSERT(bs);
root = bstp_root_bridge(bs);
if (bp->bp_state != BSTP_IFSTATE_DISABLED) {
if (bstp_supersedes_port_info(bs, bp, cu)) {
bstp_record_config_information(bs, bp, cu);
bstp_configuration_update(bs);
bstp_port_state_selection(bs);
if ((bstp_root_bridge(bs) == 0) && root) {
bstp_timer_stop(&bs->bs_hello_timer);
if (bs->bs_topology_change_detected) {
bstp_timer_stop(
&bs->bs_topology_change_timer);
bstp_transmit_tcn(bs);
bstp_timer_start(&bs->bs_tcn_timer, 0);
}
}
if (bp == bs->bs_root_port) {
bstp_record_config_timeout_values(bs, cu);
bstp_config_bpdu_generation(bs);
if (cu->cu_topology_change_acknowledgment)
bstp_topology_change_acknowledged(bs);
}
} else if (bstp_designated_port(bs, bp))
bstp_transmit_config(bs, bp);
}
}
static void
bstp_received_tcn_bpdu(struct bstp_state *bs, struct bstp_port *bp,
struct bstp_tcn_unit *tcn)
{
if (bp->bp_state != BSTP_IFSTATE_DISABLED &&
bstp_designated_port(bs, bp)) {
bstp_topology_change_detection(bs);
bstp_acknowledge_topology_change(bs, bp);
}
}
static void
bstp_hello_timer_expiry(struct bstp_state *bs)
{
bstp_config_bpdu_generation(bs);
bstp_timer_start(&bs->bs_hello_timer, 0);
}
static void
bstp_message_age_timer_expiry(struct bstp_state *bs,
struct bstp_port *bp)
{
int root;
BSTP_LOCK_ASSERT(bs);
root = bstp_root_bridge(bs);
bstp_become_designated_port(bs, bp);
bstp_configuration_update(bs);
bstp_port_state_selection(bs);
if ((bstp_root_bridge(bs)) && (root == 0)) {
bs->bs_max_age = bs->bs_bridge_max_age;
bs->bs_hello_time = bs->bs_bridge_hello_time;
bs->bs_forward_delay = bs->bs_bridge_forward_delay;
bstp_topology_change_detection(bs);
bstp_timer_stop(&bs->bs_tcn_timer);
bstp_config_bpdu_generation(bs);
bstp_timer_start(&bs->bs_hello_timer, 0);
}
}
static void
bstp_forward_delay_timer_expiry(struct bstp_state *bs,
struct bstp_port *bp)
{
if (bp->bp_state == BSTP_IFSTATE_LISTENING) {
bstp_set_port_state(bp, BSTP_IFSTATE_LEARNING);
bstp_timer_start(&bp->bp_forward_delay_timer, 0);
} else if (bp->bp_state == BSTP_IFSTATE_LEARNING) {
bstp_set_port_state(bp, BSTP_IFSTATE_FORWARDING);
if (bstp_designated_for_some_port(bs) &&
bp->bp_change_detection_enabled)
bstp_topology_change_detection(bs);
}
}
static int
bstp_designated_for_some_port(struct bstp_state *bs)
{
struct bstp_port *bp;
BSTP_LOCK_ASSERT(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bp->bp_designated_bridge == bs->bs_bridge_id)
return (1);
}
return (0);
}
static void
bstp_tcn_timer_expiry(struct bstp_state *bs)
{
BSTP_LOCK_ASSERT(bs);
bstp_transmit_tcn(bs);
bstp_timer_start(&bs->bs_tcn_timer, 0);
}
static void
bstp_topology_change_timer_expiry(struct bstp_state *bs)
{
BSTP_LOCK_ASSERT(bs);
bs->bs_topology_change_detected = 0;
bs->bs_topology_change = 0;
}
static void
bstp_hold_timer_expiry(struct bstp_state *bs, struct bstp_port *bp)
{
if (bp->bp_config_pending)
bstp_transmit_config(bs, bp);
}
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);
}
void
bstp_reinit(struct bstp_state *bs)
{
struct bstp_port *bp, *mbp;
u_char *e_addr;
BSTP_LOCK(bs);
mbp = NULL;
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
bp->bp_port_id = (bp->bp_priority << 8) |
(bp->bp_ifp->if_index & 0xff);
if (mbp == NULL) {
mbp = bp;
continue;
}
if (bstp_addr_cmp(IF_LLADDR(bp->bp_ifp),
IF_LLADDR(mbp->bp_ifp)) < 0) {
mbp = bp;
continue;
}
}
if (mbp == NULL) {
BSTP_UNLOCK(bs);
bstp_stop(bs);
return;
}
e_addr = IF_LLADDR(mbp->bp_ifp);
bs->bs_bridge_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_designated_root = bs->bs_bridge_id;
bs->bs_root_path_cost = 0;
bs->bs_root_port = NULL;
bs->bs_max_age = bs->bs_bridge_max_age;
bs->bs_hello_time = bs->bs_bridge_hello_time;
bs->bs_forward_delay = bs->bs_bridge_forward_delay;
bs->bs_topology_change_detected = 0;
bs->bs_topology_change = 0;
bstp_timer_stop(&bs->bs_tcn_timer);
bstp_timer_stop(&bs->bs_topology_change_timer);
if (callout_pending(&bs->bs_bstpcallout) == 0)
callout_reset(&bs->bs_bstpcallout, hz,
bstp_tick, bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next)
bstp_ifupdstatus(bs, bp);
bstp_port_state_selection(bs);
bstp_config_bpdu_generation(bs);
bstp_timer_start(&bs->bs_hello_timer, 0);
bstp_timer_start(&bs->bs_link_timer, 0);
BSTP_UNLOCK(bs);
}
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:
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);
void
bstp_attach(struct bstp_state *bs)
{
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_hello_time = BSTP_DEFAULT_HELLO_TIME;
bs->bs_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY;
bs->bs_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY;
bs->bs_hold_time = BSTP_DEFAULT_HOLD_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);
BSTP_LOCK_DESTROY(bs);
}
void
bstp_init(struct bstp_state *bs)
{
callout_reset(&bs->bs_bstpcallout, hz, bstp_tick, bs);
bstp_reinit(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_DISABLED);
bstp_timer_stop(&bp->bp_hold_timer);
bstp_timer_stop(&bp->bp_message_age_timer);
bstp_timer_stop(&bp->bp_forward_delay_timer);
}
callout_drain(&bs->bs_bstpcallout);
callout_stop(&bs->bs_bstpcallout);
bstp_timer_stop(&bs->bs_topology_change_timer);
bstp_timer_stop(&bs->bs_tcn_timer);
bstp_timer_stop(&bs->bs_hello_timer);
BSTP_UNLOCK(bs);
}
static void
bstp_initialize_port(struct bstp_state *bs, struct bstp_port *bp)
{
BSTP_LOCK_ASSERT(bs);
bstp_become_designated_port(bs, bp);
bstp_set_port_state(bp, BSTP_IFSTATE_BLOCKING);
bp->bp_topology_change_acknowledge = 0;
bp->bp_config_pending = 0;
bp->bp_change_detection_enabled = 1;
bstp_timer_stop(&bp->bp_message_age_timer);
bstp_timer_stop(&bp->bp_forward_delay_timer);
bstp_timer_stop(&bp->bp_hold_timer);
}
static void
bstp_enable_port(struct bstp_state *bs, struct bstp_port *bp)
{
bstp_initialize_port(bs, bp);
bstp_port_state_selection(bs);
}
static void
bstp_disable_port(struct bstp_state *bs, struct bstp_port *bp)
{
int root;
BSTP_LOCK_ASSERT(bs);
root = bstp_root_bridge(bs);
bstp_become_designated_port(bs, bp);
bstp_set_port_state(bp, BSTP_IFSTATE_DISABLED);
bp->bp_topology_change_acknowledge = 0;
bp->bp_config_pending = 0;
bstp_timer_stop(&bp->bp_message_age_timer);
bstp_timer_stop(&bp->bp_forward_delay_timer);
bstp_configuration_update(bs);
bstp_port_state_selection(bs);
/* XXX bridge_rtdelete(bs, bp->bp_ifp, IFBF_FLUSHDYN); */
if (bstp_root_bridge(bs) && (root == 0)) {
bs->bs_max_age = bs->bs_bridge_max_age;
bs->bs_hello_time = bs->bs_bridge_hello_time;
bs->bs_forward_delay = bs->bs_bridge_forward_delay;
bstp_topology_change_detection(bs);
bstp_timer_stop(&bs->bs_tcn_timer);
bstp_config_bpdu_generation(bs);
bstp_timer_start(&bs->bs_hello_timer, 0);
}
}
#ifdef notused
static void
bstp_set_bridge_priority(struct bstp_state *bs, uint64_t new_bridge_id)
{
struct bstp_port *bp;
int root;
BSTP_LOCK_ASSERT(bs);
root = bstp_root_bridge(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_designated_port(bs, bp))
bp->bp_designated_bridge = new_bridge_id;
}
bs->bs_bridge_id = new_bridge_id;
bstp_configuration_update(bs);
bstp_port_state_selection(bs);
if (bstp_root_bridge(bs) && (root == 0)) {
bs->bs_max_age = bs->bs_bridge_max_age;
bs->bs_hello_time = bs->bs_bridge_hello_time;
bs->bs_forward_delay = bs->bs_bridge_forward_delay;
bstp_topology_change_detection(bs);
bstp_timer_stop(&bs->bs_tcn_timer);
bstp_config_bpdu_generation(bs);
bstp_timer_start(&bs->bs_hello_timer, 0);
}
}
static void
bstp_set_port_priority(struct bstp_state *bs, struct bstp_port *bp,
uint16_t new_port_id)
{
if (bstp_designated_port(bs, bp))
bp->bp_designated_port = new_port_id;
bp->bp_port_id = new_port_id;
if ((bs->bs_bridge_id == bp->bp_designated_bridge) &&
(bp->bp_port_id < bp->bp_designated_port)) {
bstp_become_designated_port(bs, bp);
bstp_port_state_selection(bs);
}
}
static void
bstp_set_path_cost(struct bstp_state *bs, struct bstp_port *bp,
uint32_t path_cost)
{
bp->bp_path_cost = path_cost;
bstp_configuration_update(bs);
bstp_port_state_selection(bs);
}
static void
bstp_enable_change_detection(struct bstp_port *bp)
{
bp->bp_change_detection_enabled = 1;
}
static void
bstp_disable_change_detection(struct bstp_port *bp)
{
bp->bp_change_detection_enabled = 0;
}
#endif /* notused */
static void
bstp_enqueue(struct ifnet *dst_ifp, struct mbuf *m)
{
int err = 0;
IFQ_ENQUEUE(&dst_ifp->if_snd, m, err);
if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
(*dst_ifp->if_start)(dst_ifp);
}
void
bstp_linkstate(struct ifnet *ifp, int state)
{
struct bstp_state *bs;
struct bstp_port *bp;
/*
* It would be nice if the ifnet had a pointer to the bstp_port so we
* didnt need to search for it, but that may be an overkill. In reality
* this is fast and doesnt get called often.
*/
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);
/* 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) {
if (bp->bp_state == BSTP_IFSTATE_DISABLED)
bstp_enable_port(bs, bp);
} else {
if (bp->bp_state != BSTP_IFSTATE_DISABLED)
bstp_disable_port(bs, bp);
}
return;
}
if (bp->bp_state != BSTP_IFSTATE_DISABLED)
bstp_disable_port(bs, bp);
}
static void
bstp_tick(void *arg)
{
struct bstp_state *bs = arg;
struct bstp_port *bp;
BSTP_LOCK_ASSERT(bs);
/* slow timer to catch missed link events */
if (bstp_timer_expired(&bs->bs_link_timer, BSTP_LINK_TIMER)) {
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
bstp_ifupdstatus(bs, bp);
}
bstp_timer_start(&bs->bs_link_timer, 0);
}
if (bstp_timer_expired(&bs->bs_hello_timer, bs->bs_hello_time))
bstp_hello_timer_expiry(bs);
if (bstp_timer_expired(&bs->bs_tcn_timer, bs->bs_bridge_hello_time))
bstp_tcn_timer_expiry(bs);
if (bstp_timer_expired(&bs->bs_topology_change_timer,
bs->bs_topology_change_time))
bstp_topology_change_timer_expiry(bs);
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_timer_expired(&bp->bp_message_age_timer,
bs->bs_max_age))
bstp_message_age_timer_expiry(bs, bp);
}
LIST_FOREACH(bp, &bs->bs_bplist, bp_next) {
if (bstp_timer_expired(&bp->bp_forward_delay_timer,
bs->bs_forward_delay))
bstp_forward_delay_timer_expiry(bs, bp);
if (bstp_timer_expired(&bp->bp_hold_timer,
bs->bs_hold_time))
bstp_hold_timer_expiry(bs, bp);
}
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;
}
static void
bstp_timer_stop(struct bstp_timer *t)
{
t->value = 0;
t->active = 0;
}
static int
bstp_timer_expired(struct bstp_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);
}
int
bstp_add(struct bstp_state *bs, struct bstp_port *bp, struct ifnet *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);
bp->bp_ifp = ifp;
bp->bp_bs = bs;
bp->bp_active = 1;
bp->bp_priority = BSTP_DEFAULT_PORT_PRIORITY;
bp->bp_path_cost = BSTP_DEFAULT_PATH_COST;
LIST_INSERT_HEAD(&bs->bs_bplist, bp, bp_next);
BSTP_UNLOCK(bs);
bstp_reinit(bs);
return (0);
}
void
bstp_delete(struct bstp_port *bp)
{
struct bstp_state *bs = bp->bp_bs;
KASSERT(bp->bp_active == 1, ("not a bstp member"));
BSTP_LOCK(bs);
LIST_REMOVE(bp, bp_next);
BSTP_UNLOCK(bs);
bp->bp_bs = NULL;
bp->bp_active = 0;
bstp_reinit(bs);
}
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