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]);
+}