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 000000000000..0da11ff05fa3 --- /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 1.4 2001/04/14 21:14:39 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/smp_lock.h> + +#include "br_private.h" +#include "br_private_stp.h" + + +/* Port id is composed of priority and port number. + * NB: least significant bits of priority are dropped to + * make room for more ports. + */ +static inline port_id br_make_port_id(__u8 priority, __u16 port_no) +{ + return ((u16)priority << BR_PORT_BITS) + | (port_no & ((1<<BR_PORT_BITS)-1)); +} + +/* called under bridge lock */ +void br_init_port(struct net_bridge_port *p) +{ + p->port_id = br_make_port_id(p->priority, p->port_no); + br_become_designated_port(p); + p->state = BR_STATE_BLOCKING; + p->topology_change_ack = 0; + p->config_pending = 0; + + br_stp_port_timer_init(p); +} + +/* called under bridge lock */ +void br_stp_enable_bridge(struct net_bridge *br) +{ + struct net_bridge_port *p; + + spin_lock_bh(&br->lock); + mod_timer(&br->hello_timer, jiffies + br->hello_time); + mod_timer(&br->gc_timer, jiffies + HZ/10); + + br_config_bpdu_generation(br); + + list_for_each_entry(p, &br->port_list, list) { + if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev)) + br_stp_enable_port(p); + + } + spin_unlock_bh(&br->lock); +} + +/* NO locks held */ +void br_stp_disable_bridge(struct net_bridge *br) +{ + struct net_bridge_port *p; + + spin_lock(&br->lock); + list_for_each_entry(p, &br->port_list, list) { + if (p->state != BR_STATE_DISABLED) + br_stp_disable_port(p); + + } + + br->topology_change = 0; + br->topology_change_detected = 0; + spin_unlock(&br->lock); + + del_timer_sync(&br->hello_timer); + del_timer_sync(&br->topology_change_timer); + del_timer_sync(&br->tcn_timer); + del_timer_sync(&br->gc_timer); +} + +/* 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; + + del_timer(&p->message_age_timer); + del_timer(&p->forward_delay_timer); + del_timer(&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, + const 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); + + list_for_each_entry(p, &br->port_list, list) { + 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); + + } + + br_configuration_update(br); + br_port_state_selection(br); + if (br_is_root_bridge(br) && !wasroot) + br_become_root_bridge(br); +} + +static const unsigned char br_mac_zero[6]; + +/* called under bridge lock */ +void br_stp_recalculate_bridge_id(struct net_bridge *br) +{ + const unsigned char *addr = br_mac_zero; + struct net_bridge_port *p; + + list_for_each_entry(p, &br->port_list, list) { + if (addr == br_mac_zero || + memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0) + addr = p->dev->dev_addr; + + } + + 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, u16 newprio) +{ + struct net_bridge_port *p; + int wasroot; + + wasroot = br_is_root_bridge(br); + + list_for_each_entry(p, &br->port_list, list) { + 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; + } + + } + + 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, u8 newprio) +{ + port_id new_port_id = br_make_port_id(newprio, p->port_no); + + if (br_is_designated_port(p)) + p->designated_port = new_port_id; + + p->port_id = new_port_id; + p->priority = newprio; + 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, u32 path_cost) +{ + p->path_cost = path_cost; + br_configuration_update(p->br); + br_port_state_selection(p->br); +} + +ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id) +{ + return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n", + id->prio[0], id->prio[1], + id->addr[0], id->addr[1], id->addr[2], + id->addr[3], id->addr[4], id->addr[5]); +} |