Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
new file mode 100644
index 0000000..0da11ff
--- /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]);
+}
