diff options
Diffstat (limited to 'net/bridge/br_stp_if.c')
| -rw-r--r-- | net/bridge/br_stp_if.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c new file mode 100644 index 000000000..bbffc4126 --- /dev/null +++ b/net/bridge/br_stp_if.c @@ -0,0 +1,225 @@ +/* + * Spanning tree protocol; interface code + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek <buytenh@gnu.org> + * + * $Id: br_stp_if.c,v 1.1 2000/02/18 16:47:13 davem 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->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) +{ + int new_port_id = ((newprio & 0xFF) << 8) | p->port_no; + + 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); +} |