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/*

 *      Spanning tree protocol; interface code

 *      Linux ethernet bridge

 *

 *      Authors:

 *      Lennert Buytenhek               <buytenh@gnu.org>

 *

 *      $Id: br_stp_if.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $

 *

 *      This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 */

#include <linux/kernel.h>

#include <linux/if_bridge.h>

#include <linux/smp_lock.h>

#include <asm/uaccess.h>

#include "br_private.h"

#include "br_private_stp.h"

__u16 br_make_port_id(struct net_bridge_port *p)

{

        return (p->priority << 8) | p->port_no;

}

/* called under bridge lock */

void br_init_port(struct net_bridge_port *p)

{

        p->port_id = br_make_port_id(p);

        br_become_designated_port(p);

        p->state = BR_STATE_BLOCKING;

        p->topology_change_ack = 0;

        p->config_pending = 0;

        br_timer_clear(&p->message_age_timer);

        br_timer_clear(&p->forward_delay_timer);

        br_timer_clear(&p->hold_timer);

}

/* called under bridge lock */

void br_stp_enable_bridge(struct net_bridge *br)

{

        struct net_bridge_port *p;

        struct timer_list *timer = &br->tick;

        init_timer(timer);

        timer->data = (unsigned long) br;

        timer->function = br_tick;

        timer->expires = jiffies + 1;

        add_timer(timer);

        br_timer_set(&br->hello_timer, jiffies);

        br_config_bpdu_generation(br);

        p = br->port_list;

        while (p != NULL) {

                if (p->dev->flags & IFF_UP)

                        br_stp_enable_port(p);

                p = p->next;

        }

        br_timer_set(&br->gc_timer, jiffies);

}

/* called under bridge lock */

void br_stp_disable_bridge(struct net_bridge *br)

{

        struct net_bridge_port *p;

        br->topology_change = 0;

        br->topology_change_detected = 0;

        br_timer_clear(&br->hello_timer);

        br_timer_clear(&br->topology_change_timer);

        br_timer_clear(&br->tcn_timer);

        br_timer_clear(&br->gc_timer);

        br_fdb_cleanup(br);

        p = br->port_list;

        while (p != NULL) {

                if (p->state != BR_STATE_DISABLED)

                        br_stp_disable_port(p);

                p = p->next;

        }

        del_timer(&br->tick);

}

/* called under bridge lock */

void br_stp_enable_port(struct net_bridge_port *p)

{

        br_init_port(p);

        br_port_state_selection(p->br);

}

/* called under bridge lock */

void br_stp_disable_port(struct net_bridge_port *p)

{

        struct net_bridge *br;

        int wasroot;

        br = p->br;

        printk(KERN_INFO "%s: port %i(%s) entering %s state\n",

               br->dev.name, p->port_no, p->dev->name, "disabled");

        wasroot = br_is_root_bridge(br);

        br_become_designated_port(p);

        p->state = BR_STATE_DISABLED;

        p->topology_change_ack = 0;

        p->config_pending = 0;

        br_timer_clear(&p->message_age_timer);

        br_timer_clear(&p->forward_delay_timer);

        br_timer_clear(&p->hold_timer);

        br_configuration_update(br);

        br_port_state_selection(br);

        if (br_is_root_bridge(br) && !wasroot)

                br_become_root_bridge(br);

}

/* called under bridge lock */

static void br_stp_change_bridge_id(struct net_bridge *br, unsigned char *addr)

{

        unsigned char oldaddr[6];

        struct net_bridge_port *p;

        int wasroot;

        wasroot = br_is_root_bridge(br);

        memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);

        memcpy(br->bridge_id.addr, addr, ETH_ALEN);

        memcpy(br->dev.dev_addr, addr, ETH_ALEN);

        p = br->port_list;

        while (p != NULL) {

                if (!memcmp(p->designated_bridge.addr, oldaddr, ETH_ALEN))

                        memcpy(p->designated_bridge.addr, addr, ETH_ALEN);

                if (!memcmp(p->designated_root.addr, oldaddr, ETH_ALEN))

                        memcpy(p->designated_root.addr, addr, ETH_ALEN);

                p = p->next;

        }

        br_configuration_update(br);

        br_port_state_selection(br);

        if (br_is_root_bridge(br) && !wasroot)

                br_become_root_bridge(br);

}

static unsigned char br_mac_zero[6] = {0,0,0,0,0,0};

/* called under bridge lock */

void br_stp_recalculate_bridge_id(struct net_bridge *br)

{

        unsigned char *addr;

        struct net_bridge_port *p;

        addr = br_mac_zero;

        p = br->port_list;

        while (p != NULL) {

                if (addr == br_mac_zero ||

                    memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)

                        addr = p->dev->dev_addr;

                p = p->next;

        }

        if (memcmp(br->bridge_id.addr, addr, ETH_ALEN))

                br_stp_change_bridge_id(br, addr);

}

/* called under bridge lock */

void br_stp_set_bridge_priority(struct net_bridge *br, int newprio)

{

        struct net_bridge_port *p;

        int wasroot;

        wasroot = br_is_root_bridge(br);

        p = br->port_list;

        while (p != NULL) {

                if (p->state != BR_STATE_DISABLED &&

                    br_is_designated_port(p)) {

                        p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;

                        p->designated_bridge.prio[1] = newprio & 0xFF;

                }

                p = p->next;

        }

        br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;

        br->bridge_id.prio[1] = newprio & 0xFF;

        br_configuration_update(br);

        br_port_state_selection(br);

        if (br_is_root_bridge(br) && !wasroot)

                br_become_root_bridge(br);

}

/* called under bridge lock */

void br_stp_set_port_priority(struct net_bridge_port *p, int newprio)

{

        __u16 new_port_id;

        p->priority = newprio & 0xFF;

        new_port_id = br_make_port_id(p);

        if (br_is_designated_port(p))

                p->designated_port = new_port_id;

        p->port_id = new_port_id;

        if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&

            p->port_id < p->designated_port) {

                br_become_designated_port(p);

                br_port_state_selection(p->br);

        }

}

/* called under bridge lock */

void br_stp_set_path_cost(struct net_bridge_port *p, int path_cost)

{

        p->path_cost = path_cost;

        br_configuration_update(p->br);

        br_port_state_selection(p->br);

}