/* called under bridge lock */
void br_become_root_bridge(struct net_bridge *br)
{
br->max_age = br->bridge_max_age;
br->hello_time = br->bridge_hello_time;
br->forward_delay = br->bridge_forward_delay;
br_topology_change_detection(br);
br_timer_clear(&br->tcn_timer);
br_config_bpdu_generation(br);
br_timer_set(&br->hello_timer, jiffies);
}
/* lock-safe */
void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
{
struct net_bridge *br;
int was_root;
if (p->state == BR_STATE_DISABLED)
return;
br = p->br;
read_lock(&br->lock);
was_root = br_is_root_bridge(br);
if (br_supersedes_port_info(p, bpdu)) {
br_record_config_information(p, bpdu);
br_configuration_update(br);
br_port_state_selection(br);
if (!br_is_root_bridge(br) && was_root) {
br_timer_clear(&br->hello_timer);
if (br->topology_change_detected) {
br_timer_clear(&br->topology_change_timer);
br_transmit_tcn(br);
br_timer_set(&br->tcn_timer, jiffies);
}
}
if (p->port_no == br->root_port) {
br_record_config_timeout_values(br, bpdu);
br_config_bpdu_generation(br);
if (bpdu->topology_change_ack)
br_topology_change_acknowledged(br);
}
} else if (br_is_designated_port(p)) {
br_reply(p);
}
read_unlock(&br->lock);
}
/* 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 */
static void br_hello_timer_expired(struct net_bridge *br)
{
br_config_bpdu_generation(br);
br_timer_set(&br->hello_timer, jiffies);
}