patch-1.3.86 linux/net/bridge/br.c
Next file: linux/net/bridge/br_tree.c
Previous file: linux/net/bridge/Makefile
Back to the patch index
Back to the overall index
- Lines: 1562
- Date:
Wed Apr 10 08:52:39 1996
- Orig file:
v1.3.85/linux/net/bridge/br.c
- Orig date:
Thu Jan 1 02:00:00 1970
diff -u --recursive --new-file v1.3.85/linux/net/bridge/br.c linux/net/bridge/br.c
@@ -0,0 +1,1561 @@
+/*
+ * Linux NET3 Bridge Support
+ *
+ * Originally by John Hayes (Network Plumbing).
+ * Minor hacks to get it to run with 1.3.x by Alan Cox <Alan.Cox@linux.org>
+ *
+ * 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.
+ *
+ * Fixes:
+ *
+ * Todo:
+ * Don't bring up devices automatically. Start ports disabled
+ * and use a netlink notifier so a daemon can maintain the bridge
+ * port group (could we also do multiple groups ????).
+ * A nice /proc file interface.
+ * Put the path costs in the port info and devices
+ * Put the bridge port number in the device structure for speed.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <net/br.h>
+
+static int br_device_event(struct notifier_block *dnot, unsigned long event, void *ptr);
+static void br_tick(unsigned long arg);
+int br_forward(struct sk_buff *skb, int port); /* 3.7 */
+int br_port_cost(struct device *dev); /* 4.10.2 */
+void br_bpdu(struct sk_buff *skb); /* consumes skb */
+int br_tx_frame(struct sk_buff *skb);
+int br_cmp(unsigned int *a, unsigned int *b);
+
+unsigned char bridge_ula[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+
+Bridge_data bridge_info; /* (4.5.3) */
+Port_data port_info[All_ports]; /* (4.5.5) */
+Config_bpdu config_bpdu[All_ports];
+Tcn_bpdu tcn_bpdu[All_ports];
+Timer hello_timer; /* (4.5.4.1) */
+Timer tcn_timer; /* (4.5.4.2) */
+Timer topology_change_timer; /* (4.5.4.3) */
+Timer message_age_timer[All_ports]; /* (4.5.6.1) */
+Timer forward_delay_timer[All_ports]; /* (4.5.6.2) */
+Timer hold_timer[All_ports]; /* (4.5.6.3) */
+
+/* entries timeout after this many seconds */
+unsigned int fdb_aging_time = FDB_TIMEOUT;
+
+struct br_stat br_stats;
+
+static struct timer_list tl; /* for 1 second timer... */
+
+/*
+ * the following structure is required so that we receive
+ * event notifications when network deviced are enabled and
+ * disabled (ifconfig up and down).
+ */
+static struct notifier_block br_dev_notifier={
+ br_device_event,
+ NULL,
+ 0
+};
+
+/** Elements of Procedure (4.6) **/
+
+/*
+ * this section of code was gratiously borrowed from the IEEE 802.1d
+ * specification section 4.9.1 starting on pg 69. It has been
+ * modified somewhat to fit within out framework and structure. It
+ * implements the spanning tree algorithm that is the heart of the
+ * 802.1d bridging protocol.
+ */
+
+void
+transmit_config(int port_no) /* (4.6.1) */
+{
+ if (hold_timer[port_no].active) { /* (4.6.1.3.1) */
+ port_info[port_no].config_pending = TRUE; /* (4.6.1.3.1) */
+ } else { /* (4.6.1.3.2) */
+ config_bpdu[port_no].type = BPDU_TYPE_CONFIG;
+ config_bpdu[port_no].root_id = bridge_info.designated_root;
+ /* (4.6.1.3.2(1)) */
+ config_bpdu[port_no].root_path_cost = bridge_info.root_path_cost;
+ /* (4.6.1.3.2(2)) */
+ config_bpdu[port_no].bridge_id = bridge_info.bridge_id;
+ /* (4.6.1.3.2(3)) */
+ config_bpdu[port_no].port_id = port_info[port_no].port_id;
+ /*
+ * (4.6.1.3.2(4))
+ */
+ if (root_bridge()) {
+ config_bpdu[port_no].message_age = Zero; /* (4.6.1.3.2(5)) */
+ } else {
+ config_bpdu[port_no].message_age
+ = message_age_timer[bridge_info.root_port].value
+ + Message_age_increment; /* (4.6.1.3.2(6)) */
+ }
+
+ config_bpdu[port_no].max_age = bridge_info.max_age; /* (4.6.1.3.2(7)) */
+ config_bpdu[port_no].hello_time = bridge_info.hello_time;
+ config_bpdu[port_no].forward_delay = bridge_info.forward_delay;
+ config_bpdu[port_no].flags = 0;
+ config_bpdu[port_no].flags |=
+ port_info[port_no].top_change_ack ? TOPOLOGY_CHANGE_ACK : 0;
+ /* (4.6.1.3.2(8)) */
+ port_info[port_no].top_change_ack = 0;
+ /* (4.6.1.3.2(8)) */
+ config_bpdu[port_no].flags |=
+ bridge_info.top_change ? TOPOLOGY_CHANGE : 0;
+ /* (4.6.1.3.2(9)) */
+
+ send_config_bpdu(port_no, &config_bpdu[port_no]);
+ port_info[port_no].config_pending = FALSE; /* (4.6.1.3.2(10)) */
+ start_hold_timer(port_no); /* (4.6.1.3.2(11)) */
+ }
+}
+
+int
+root_bridge(void)
+{
+ return (br_cmp(bridge_info.designated_root.BRIDGE_ID,
+ bridge_info.bridge_id.BRIDGE_ID)?FALSE:TRUE);
+}
+
+int
+supersedes_port_info(int port_no, Config_bpdu *config) /* (4.6.2.2) */
+{
+ return (
+ (br_cmp(config->root_id.BRIDGE_ID,
+ port_info[port_no].designated_root.BRIDGE_ID) < 0) /* (4.6.2.2.1) */
+ ||
+ ((br_cmp(config->root_id.BRIDGE_ID,
+ port_info[port_no].designated_root.BRIDGE_ID) == 0
+ )
+ &&
+ ((config->root_path_cost
+ < port_info[port_no].designated_cost /* (4.6.2.2.2) */
+ )
+ ||
+ ((config->root_path_cost
+ == port_info[port_no].designated_cost
+ )
+ &&
+ ((br_cmp(config->bridge_id.BRIDGE_ID,
+ port_info[port_no].designated_bridge.BRIDGE_ID) < 0 /* (4.6.2.2.3) */
+ )
+ ||
+ ((br_cmp(config->bridge_id.BRIDGE_ID,
+ port_info[port_no].designated_bridge.BRIDGE_ID) == 0
+ ) /* (4.6.2.2.4) */
+ &&
+ ((br_cmp(config->bridge_id.BRIDGE_ID,
+ bridge_info.bridge_id.BRIDGE_ID) != 0
+ ) /* (4.6.2.2.4(1)) */
+ ||
+ (config->port_id <=
+ port_info[port_no].designated_port
+ ) /* (4.6.2.2.4(2)) */
+ ))))))
+ );
+}
+
+void
+record_config_information(int port_no, Config_bpdu *config) /* (4.6.2) */
+{
+ port_info[port_no].designated_root = config->root_id; /* (4.6.2.3.1) */
+ port_info[port_no].designated_cost = config->root_path_cost;
+ port_info[port_no].designated_bridge = config->bridge_id;
+ port_info[port_no].designated_port = config->port_id;
+ start_message_age_timer(port_no, config->message_age); /* (4.6.2.3.2) */
+}
+
+void
+record_config_timeout_values(Config_bpdu *config) /* (4.6.3) */
+{
+ bridge_info.max_age = config->max_age; /* (4.6.3.3) */
+ bridge_info.hello_time = config->hello_time;
+ bridge_info.forward_delay = config->forward_delay;
+ if (config->flags & TOPOLOGY_CHANGE)
+ bridge_info.top_change = 1;
+}
+
+void
+config_bpdu_generation(void)
+{ /* (4.6.4) */
+ int port_no;
+ for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.4.3) */
+ if (designated_port(port_no) /* (4.6.4.3) */
+ &&
+ (port_info[port_no].state != Disabled)
+ ) {
+ transmit_config(port_no); /* (4.6.4.3) */
+ } /* (4.6.1.2) */
+ }
+}
+
+int
+designated_port(int port_no)
+{
+ return ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
+ bridge_info.bridge_id.BRIDGE_ID) == 0
+ )
+ &&
+ (port_info[port_no].designated_port
+ == port_info[port_no].port_id
+ )
+ );
+}
+
+void
+reply(int port_no) /* (4.6.5) */
+{
+ transmit_config(port_no); /* (4.6.5.3) */
+}
+
+void
+transmit_tcn(void)
+{ /* (4.6.6) */
+ int port_no;
+
+ port_no = bridge_info.root_port;
+ tcn_bpdu[port_no].type = BPDU_TYPE_TOPO_CHANGE;
+ send_tcn_bpdu(port_no, &tcn_bpdu[bridge_info.root_port]); /* (4.6.6.3) */
+}
+
+void
+configuration_update(void) /* (4.6.7) */
+{
+ root_selection(); /* (4.6.7.3.1) */
+ /* (4.6.8.2) */
+ designated_port_selection(); /* (4.6.7.3.2) */
+ /* (4.6.9.2) */
+}
+
+void
+root_selection(void)
+{ /* (4.6.8) */
+ int root_port;
+ int port_no;
+ root_port = No_port;
+ for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.8.3.1) */
+ if (((!designated_port(port_no))
+ &&
+ (port_info[port_no].state != Disabled)
+ &&
+ (br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
+ bridge_info.bridge_id.BRIDGE_ID) < 0)
+ )
+ &&
+ ((root_port == No_port)
+ ||
+ (br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
+ port_info[root_port].designated_root.BRIDGE_ID) < 0
+ )
+ ||
+ ((br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
+ port_info[root_port].designated_root.BRIDGE_ID) == 0
+ )
+ &&
+ (((port_info[port_no].designated_cost
+ + port_info[port_no].path_cost
+ )
+ ==
+ (port_info[root_port].designated_cost
+ + port_info[root_port].path_cost
+ ) /* (4.6.8.3.1(2)) */
+ )
+ ||
+ (((port_info[port_no].designated_cost
+ + port_info[port_no].path_cost
+ )
+ ==
+ (port_info[root_port].designated_cost
+ + port_info[root_port].path_cost
+ )
+ )
+ &&
+ ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
+ port_info[root_port].designated_bridge.BRIDGE_ID) < 0
+ ) /* (4.6.8.3.1(3)) */
+ ||
+ ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
+ port_info[root_port].designated_bridge.BRIDGE_ID) == 0
+ )
+ &&
+ ((port_info[port_no].designated_port
+ < port_info[root_port].designated_port
+ ) /* (4.6.8.3.1(4)) */
+ ||
+ ((port_info[port_no].designated_port
+ = port_info[root_port].designated_port
+ )
+ &&
+ (port_info[port_no].port_id
+ < port_info[root_port].port_id
+ ) /* (4.6.8.3.1(5)) */
+ ))))))))) {
+ root_port = port_no;
+ }
+ }
+ bridge_info.root_port = root_port; /* (4.6.8.3.1) */
+
+ if (root_port == No_port) { /* (4.6.8.3.2) */
+ bridge_info.designated_root = bridge_info.bridge_id;
+ /* (4.6.8.3.2(1)) */
+ bridge_info.root_path_cost = Zero;/* (4.6.8.3.2(2)) */
+ } else { /* (4.6.8.3.3) */
+ bridge_info.designated_root = port_info[root_port].designated_root;
+ /* (4.6.8.3.3(1)) */
+ bridge_info.root_path_cost = (port_info[root_port].designated_cost
+ + port_info[root_port].path_cost
+ ); /* (4.6.8.3.3(2)) */
+ }
+}
+
+void
+designated_port_selection(void)
+{ /* (4.6.9) */
+ int port_no;
+
+ for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.9.3) */
+ if (designated_port(port_no) /* (4.6.9.3.1) */
+ ||
+ (
+ br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
+ bridge_info.designated_root.BRIDGE_ID) != 0
+ )
+ ||
+ (bridge_info.root_path_cost
+ < port_info[port_no].designated_cost
+ ) /* (4.6.9.3.3) */
+ ||
+ ((bridge_info.root_path_cost
+ == port_info[port_no].designated_cost
+ )
+ &&
+ ((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
+ port_info[port_no].designated_bridge.BRIDGE_ID) < 0
+ ) /* (4.6.9.3.4) */
+ ||
+ ((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
+ port_info[port_no].designated_bridge.BRIDGE_ID) == 0
+ )
+ &&
+ (port_info[port_no].port_id
+ <= port_info[port_no].designated_port
+ ) /* (4.6.9.3.5) */
+ )))) {
+ become_designated_port(port_no); /* (4.6.10.3.2.2) */
+ }
+ }
+}
+
+void
+become_designated_port(int port_no)
+{ /* (4.6.10) */
+
+ /* (4.6.10.3.1) */
+ port_info[port_no].designated_root = bridge_info.designated_root;
+ /* (4.6.10.3.2) */
+ port_info[port_no].designated_cost = bridge_info.root_path_cost;
+ /* (4.6.10.3.3) */
+ port_info[port_no].designated_bridge = bridge_info.bridge_id;
+ /* (4.6.10.3.4) */
+ port_info[port_no].designated_port = port_info[port_no].port_id;
+}
+
+void
+port_state_selection(void)
+{ /* (4.6.11) */
+ int port_no;
+ for (port_no = One; port_no <= No_of_ports; port_no++) {
+ if (port_no == bridge_info.root_port) { /* (4.6.11.3.1) */
+ port_info[port_no].config_pending = FALSE; /* (4.6.11.3~1(1)) */
+ port_info[port_no].top_change_ack = 0;
+ make_forwarding(port_no); /* (4.6.11.3.1(2)) */
+ } else if (designated_port(port_no)) { /* (4.6.11.3.2) */
+ stop_message_age_timer(port_no); /* (4.6.11.3.2(1)) */
+ make_forwarding(port_no); /* (4.6.11.3.2(2)) */
+ } else { /* (4.6.11.3.3) */
+ port_info[port_no].config_pending = FALSE; /* (4.6.11.3.3(1)) */
+ port_info[port_no].top_change_ack = 0;
+ make_blocking(port_no); /* (4.6.11.3.3(2)) */
+ }
+ }
+
+}
+
+void
+make_forwarding(int port_no)
+{ /* (4.6.12) */
+ if (port_info[port_no].state == Blocking) { /* (4.6.12.3) */
+ set_port_state(port_no, Listening); /* (4.6.12.3.1) */
+ start_forward_delay_timer(port_no); /* (4.6.12.3.2) */
+ }
+}
+
+void
+topology_change_detection(void)
+{ /* (4.6.14) */
+ if (root_bridge()) { /* (4.6.14.3.1) */
+ bridge_info.top_change = 1;
+ start_topology_change_timer(); /* (4.6.14.3.1(2)) */
+ } else if (!(bridge_info.top_change_detected)) {
+ transmit_tcn(); /* (4.6.14.3.2(1)) */
+ start_tcn_timer(); /* (4.6.14.3.2(2)) */
+ }
+ bridge_info.top_change = 1;
+}
+
+void
+topology_change_acknowledged(void)
+{ /* (4.6.15) */
+ bridge_info.top_change_detected = 0;
+ stop_tcn_timer(); /* (4.6.15.3.2) */
+}
+
+void
+acknowledge_topology_change(int port_no)
+{ /* (4.6.16) */
+ port_info[port_no].top_change_ack = 1;
+ transmit_config(port_no); /* (4.6.16.3.2) */
+}
+
+void
+make_blocking(int port_no) /* (4.6.13) */
+{
+
+ if ((port_info[port_no].state != Disabled)
+ &&
+ (port_info[port_no].state != Blocking)
+ /* (4.6.13.3) */
+ ) {
+ if ((port_info[port_no].state == Forwarding)
+ ||
+ (port_info[port_no].state == Learning)
+ ) {
+ topology_change_detection(); /* (4.6.13.3.1) */
+ /* (4.6.14.2.3) */
+ }
+ set_port_state(port_no, Blocking);/* (4.6.13.3.2) */
+ stop_forward_delay_timer(port_no);/* (4.6.13.3.3) */
+ }
+}
+
+void
+set_port_state(int port_no, int state)
+{
+ port_info[port_no].state = state;
+}
+
+void
+received_config_bpdu(int port_no, Config_bpdu *config) /* (4.7.1) */
+{
+ int root;
+
+ root = root_bridge();
+ if (port_info[port_no].state != Disabled) {
+ if (supersedes_port_info(port_no, config)) { /* (4.7.1.1) *//* (4.
+ * 6.2.2) */
+ record_config_information(port_no, config); /* (4.7.1.1.1) */
+ /* (4.6.2.2) */
+ configuration_update(); /* (4.7.1.1.2) */
+ /* (4.6.7.2.1) */
+ port_state_selection(); /* (4.7.1.1.3) */
+ /* (4.6.11.2.1) */
+ if ((!root_bridge()) && root) { /* (4.7.1.1.4) */
+ stop_hello_timer();
+ if (bridge_info.top_change_detected) { /* (4.7.1.1.5~ */
+ stop_topology_change_timer();
+ transmit_tcn(); /* (4.6.6.1) */
+ start_tcn_timer();
+ }
+ }
+ if (port_no == bridge_info.root_port) {
+ record_config_timeout_values(config); /* (4.7.1.1.6) */
+ /* (4.6.3.2) */
+ config_bpdu_generation(); /* (4.6.4.2.1) */
+ if (config->flags & TOPOLOGY_CHANGE_ACK) { /* (4.7.1.1.7) */
+ topology_change_acknowledged(); /* (4.6.15.2) */
+ }
+ }
+ } else if (designated_port(port_no)) { /* (4.7.1.2) */
+ reply(port_no); /* (4.7.1.2.1) */
+ /* (4.6.5.2) */
+ }
+ }
+}
+
+void
+received_tcn_bpdu(int port_no, Tcn_bpdu *tcn) /* (4.7.2) */
+{
+ if (port_info[port_no].state != Disabled) {
+ if (designated_port(port_no)) {
+ topology_change_detection(); /* (4.7.2.1) */
+ /* (4.6.14.2.1) */
+ acknowledge_topology_change(port_no); /* (4.7.2.2) */
+ } /* (4.6.16.2) */
+ }
+}
+
+void
+hello_timer_expiry(void)
+{ /* (4.7.3) */
+ config_bpdu_generation(); /* (4.6.4.2.2) */
+ start_hello_timer();
+}
+
+void
+message_age_timer_expiry(int port_no) /* (4.7.4) */
+{
+ int root;
+ root = root_bridge();
+
+ become_designated_port(port_no); /* (4.7.4.1) */
+ /* (4.6.10.2.1) */
+ configuration_update(); /* (4.7.4.2) */
+ /* (4.6.7.2.2) */
+ port_state_selection(); /* (4.7.4.3) */
+ /* (4.6.11.2.2) */
+ if ((root_bridge()) && (!root)) { /* (4.7.4.4) */
+
+ bridge_info.max_age = bridge_info.bridge_max_age; /* (4.7.4.4.1) */
+ bridge_info.hello_time = bridge_info.bridge_hello_time;
+ bridge_info.forward_delay = bridge_info.bridge_forward_delay;
+ topology_change_detection(); /* (4.7.4.4.2) */
+ /* (4.6.14.2.4) */
+ stop_tcn_timer(); /* (4.7.4.4.3) */
+ config_bpdu_generation(); /* (4.7.4.4.4) */
+ /* (4.6.4.4.3) */
+ start_hello_timer();
+ }
+}
+
+void
+forward_delay_timer_expiry(int port_no) /* (4.7.5) */
+{
+ if (port_info[port_no].state == Listening) { /* (4.7.5.1) */
+ set_port_state(port_no, Learning); /* (4.7.5.1.1) */
+ start_forward_delay_timer(port_no); /* (4.7.5.1.2) */
+ } else if (port_info[port_no].state == Learning) { /* (4.7.5.2) */
+ set_port_state(port_no, Forwarding); /* (4.7.5.2.1) */
+ if (designated_for_some_port()) { /* (4.7.5.2.2) */
+ topology_change_detection(); /* (4.6.14.2.2) */
+
+ }
+ }
+}
+
+int
+designated_for_some_port(void)
+{
+ int port_no;
+
+
+ for (port_no = One; port_no <= No_of_ports; port_no++) {
+ if ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
+ bridge_info.bridge_id.BRIDGE_ID) == 0)
+ ) {
+ return (TRUE);
+ }
+ }
+ return (FALSE);
+}
+
+void
+tcn_timer_expiry(void)
+{ /* (4.7.6) */
+ transmit_tcn(); /* (4.7.6.1) */
+ start_tcn_timer(); /* (4.7.6.2) */
+}
+
+void
+topology_change_timer_expiry(void)
+{ /* (4.7.7) */
+ bridge_info.top_change_detected = 0;
+ bridge_info.top_change = 0;
+ /* (4.7.7.2) */
+}
+
+void
+hold_timer_expiry(int port_no) /* (4.7.8) */
+{
+ if (port_info[port_no].config_pending) {
+ transmit_config(port_no); /* (4.7.8.1) */
+ } /* (4.6.1.2.3) */
+}
+
+void
+br_init(void)
+{ /* (4.8.1) */
+ int port_no;
+
+ bridge_info.designated_root = bridge_info.bridge_id; /* (4.8.1.1) */
+ bridge_info.root_path_cost = Zero;
+ bridge_info.root_port = No_port;
+
+ bridge_info.bridge_max_age = BRIDGE_MAX_AGE;
+ bridge_info.bridge_hello_time = BRIDGE_HELLO_TIME;
+ bridge_info.bridge_forward_delay = BRIDGE_FORWARD_DELAY;
+ bridge_info.hold_time = HOLD_TIME;
+
+ bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.1.2) */
+ bridge_info.hello_time = bridge_info.bridge_hello_time;
+ bridge_info.forward_delay = bridge_info.bridge_forward_delay;
+
+ bridge_info.top_change_detected = 0;
+ bridge_info.top_change = 0;
+ stop_tcn_timer();
+ stop_topology_change_timer();
+ for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.8.1.4) */
+ br_init_port(port_no);
+ disable_port(port_no);
+ }
+ port_state_selection(); /* (4.8.1.5) */
+ config_bpdu_generation(); /* (4.8.1.6) */
+
+ /* initialize system timer */
+ tl.expires = HZ; /* 1 second */
+ tl.function = br_tick;
+ add_timer(&tl);
+
+ register_netdevice_notifier(&br_dev_notifier);
+ br_stats.flags = BR_UP | BR_DEBUG; /* enable bridge */
+ start_hello_timer();
+}
+
+void
+br_init_port(int port_no)
+{
+ become_designated_port(port_no); /* (4.8.1.4.1) */
+ set_port_state(port_no, Blocking); /* (4.8.1.4.2) */
+ port_info[port_no].top_change_ack = 0;
+ port_info[port_no].config_pending = FALSE;/* (4.8.1.4.4) */
+ stop_message_age_timer(port_no); /* (4.8.1.4.5) */
+ stop_forward_delay_timer(port_no); /* (4.8.1.4.6) */
+ stop_hold_timer(port_no); /* (4.8.1.4.7) */
+}
+
+void
+enable_port(int port_no) /* (4.8.2) */
+{
+ br_init_port(port_no);
+ port_state_selection(); /* (4.8.2.7) */
+} /* */
+
+void
+disable_port(int port_no) /* (4.8.3) */
+{
+ int root;
+
+ root = root_bridge();
+ become_designated_port(port_no); /* (4.8.3.1) */
+ set_port_state(port_no, Disabled); /* (4.8.3.2) */
+ port_info[port_no].top_change_ack = 0;
+ port_info[port_no].config_pending = FALSE;/* (4.8.3.4) */
+ stop_message_age_timer(port_no); /* (4.8.3.5) */
+ stop_forward_delay_timer(port_no); /* (4.8.3.6) */
+ configuration_update();
+ port_state_selection(); /* (4.8.3.7) */
+ if ((root_bridge()) && (!root)) { /* (4.8.3.8) */
+ bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.3.8.1) */
+ bridge_info.hello_time = bridge_info.bridge_hello_time;
+ bridge_info.forward_delay = bridge_info.bridge_forward_delay;
+ topology_change_detection(); /* (4.8.3.8.2) */
+ stop_tcn_timer(); /* (4.8.3.8.3) */
+ config_bpdu_generation(); /* (4.8.3.8.4) */
+ start_hello_timer();
+ }
+}
+
+
+void
+set_bridge_priority(bridge_id_t *new_bridge_id) /* (4.8.4) */
+{
+
+ int root;
+ int port_no;
+ root = root_bridge();
+ for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.8.4.2) */
+ if (designated_port(port_no)) {
+ port_info[port_no].designated_bridge = *new_bridge_id;
+ }
+ }
+
+ bridge_info.bridge_id = *new_bridge_id; /* (4.8.4.3) */
+ configuration_update(); /* (4.8.4.4) */
+ port_state_selection(); /* (4.8.4.5) */
+ if ((root_bridge()) && (!root)) { /* (4.8.4.6) */
+ bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.4.6.1) */
+ bridge_info.hello_time = bridge_info.bridge_hello_time;
+ bridge_info.forward_delay = bridge_info.bridge_forward_delay;
+ topology_change_detection(); /* (4.8.4.6.2) */
+ stop_tcn_timer(); /* (4.8.4.6.3) */
+ config_bpdu_generation(), /* (4.8.4.6.4) */
+ start_hello_timer();
+ }
+}
+
+void
+set_port_priority(int port_no, unsigned short new_port_id) /* (4.8.5) */
+{
+ if (designated_port(port_no)) { /* (4.8.5.2) */
+ port_info[port_no].designated_port = new_port_id;
+ }
+ port_info[port_no].port_id = new_port_id; /* (4.8.5.3) */
+ if ((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
+ port_info[port_no].designated_bridge.BRIDGE_ID) == 0
+ )
+ &&
+ (port_info[port_no].port_id
+ < port_info[port_no].designated_port
+
+ )
+ ) {
+ become_designated_port(port_no); /* (4.8.5.4.1) */
+ port_state_selection(); /* (4.8.5.4.2) */
+ }
+}
+
+void
+set_path_cost(int port_no, unsigned short path_cost) /* (4.8.6) */
+{
+ port_info[port_no].path_cost = path_cost; /* (4.8.6.1) */
+ configuration_update(); /* (4.8.6.2) */
+ port_state_selection(); /* (4.8.6.3) */
+}
+
+static void
+br_tick(unsigned long arg)
+{
+ int port_no;
+
+ if (hello_timer_expired()) {
+ hello_timer_expiry();
+ }
+ if (tcn_timer_expired()) {
+ tcn_timer_expiry();
+ }
+ if (topology_change_timer_expired()) {
+ topology_change_timer_expiry();
+ }
+ for (port_no = One; port_no <= No_of_ports; port_no++) {
+ if (forward_delay_timer_expired(port_no)) {
+ forward_delay_timer_expiry(port_no);
+ }
+ if (message_age_timer_expired(port_no)) {
+ message_age_timer_expiry(port_no);
+ }
+ if (hold_timer_expired(port_no)) {
+ hold_timer_expiry(port_no);
+ }
+ }
+ /* call me again sometime... */
+ tl.expires = HZ; /* 1 second */
+ tl.function = br_tick;
+ add_timer(&tl);
+}
+
+void
+start_hello_timer(void)
+{
+ hello_timer.value = 0;
+ hello_timer.active = TRUE;
+}
+
+void
+stop_hello_timer(void)
+{
+ hello_timer.active = FALSE;
+}
+
+int
+hello_timer_expired(void)
+{
+ if (hello_timer.active && (++hello_timer.value >= bridge_info.hello_time)) {
+ hello_timer.active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+}
+
+void
+start_tcn_timer(void)
+{
+ tcn_timer.value = 0;
+ tcn_timer.active = TRUE;
+}
+
+void
+stop_tcn_timer(void)
+{
+ tcn_timer.active = FALSE;
+}
+
+int
+tcn_timer_expired(void)
+{
+ if (tcn_timer.active && (++tcn_timer.value >=
+ bridge_info.bridge_hello_time)) {
+ tcn_timer.active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+
+}
+
+void
+start_topology_change_timer(void)
+{
+ topology_change_timer.value = 0;
+ topology_change_timer.active = TRUE;
+}
+
+void
+stop_topology_change_timer(void)
+{
+ topology_change_timer.active = FALSE;
+}
+
+int
+topology_change_timer_expired(void)
+{
+ if (topology_change_timer.active
+ && (++topology_change_timer.value
+ >= bridge_info.topology_change_time
+ )) {
+ topology_change_timer.active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+}
+
+void
+start_message_age_timer(int port_no, unsigned short message_age)
+{
+ message_age_timer[port_no].value = message_age;
+ message_age_timer[port_no].active = TRUE;
+}
+
+void
+stop_message_age_timer(int port_no)
+{
+ message_age_timer[port_no].active = FALSE;
+}
+
+int
+message_age_timer_expired(int port_no)
+{
+ if (message_age_timer[port_no].active &&
+ (++message_age_timer[port_no].value >= bridge_info.max_age)) {
+ message_age_timer[port_no].active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+}
+
+void
+start_forward_delay_timer(int port_no)
+{
+ forward_delay_timer[port_no].value = 0;
+ forward_delay_timer[port_no].active = TRUE;
+}
+
+void
+stop_forward_delay_timer(int port_no)
+{
+ forward_delay_timer[port_no].active = FALSE;
+}
+
+int
+forward_delay_timer_expired(int port_no)
+{
+ if (forward_delay_timer[port_no].active &&
+ (++forward_delay_timer[port_no].value >= bridge_info.forward_delay)) {
+ forward_delay_timer[port_no].active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+}
+
+void
+start_hold_timer(int port_no)
+{
+ hold_timer[port_no].value = 0;
+ hold_timer[port_no].active = TRUE;
+}
+
+void
+stop_hold_timer(int port_no)
+{
+ hold_timer[port_no].active = FALSE;
+}
+
+
+int
+hold_timer_expired(int port_no)
+{
+ if (hold_timer[port_no].active &&
+ (++hold_timer[port_no].value >= bridge_info.hold_time)) {
+ hold_timer[port_no].active = FALSE;
+ return (TRUE);
+ }
+ return (FALSE);
+
+}
+
+int
+send_config_bpdu(int port_no, Config_bpdu *config_bpdu)
+{
+struct sk_buff *skb;
+struct device *dev = port_info[port_no].dev;
+int size;
+unsigned long flags;
+
+ if (port_info[port_no].state == Disabled) {
+ printk("send_config_bpdu: port %i not valid\n",port_no);
+ return(-1);
+ }
+ if (br_stats.flags & BR_DEBUG)
+ printk("send_config_bpdu: ");
+ /*
+ * create and send the message
+ */
+ size = sizeof(Config_bpdu) + dev->hard_header_len;
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (skb == NULL) {
+ printk("send_config_bpdu: no skb available\n");
+ return(-1);
+ }
+ skb->dev = dev;
+ skb->free = 1;
+ skb->h.eth = (struct ethhdr *)skb_put(skb, size);
+ memcpy(skb->h.eth->h_dest, bridge_ula, ETH_ALEN);
+ memcpy(skb->h.eth->h_source, dev->dev_addr, ETH_ALEN);
+ if (br_stats.flags & BR_DEBUG)
+ printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
+ dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ port_no,
+ skb->h.eth->h_source[0],
+ skb->h.eth->h_source[1],
+ skb->h.eth->h_source[2],
+ skb->h.eth->h_source[3],
+ skb->h.eth->h_source[4],
+ skb->h.eth->h_source[5],
+ skb->h.eth->h_dest[0],
+ skb->h.eth->h_dest[1],
+ skb->h.eth->h_dest[2],
+ skb->h.eth->h_dest[3],
+ skb->h.eth->h_dest[4],
+ skb->h.eth->h_dest[5]);
+ skb->h.eth->h_proto = htonl(0x8038); /* XXX verify */
+
+ skb->h.raw += skb->dev->hard_header_len;
+ memcpy(skb->h.raw, config_bpdu, sizeof(Config_bpdu));
+
+ /* won't get bridged again... */
+ skb->pkt_bridged = IS_BRIDGED;
+ skb->arp = 1; /* do not resolve... */
+ skb->h.raw = skb->data + ETH_HLEN;
+ save_flags(flags);
+ cli();
+ skb_queue_tail(dev->buffs, skb);
+ restore_flags(flags);
+ return(0);
+}
+
+int
+send_tcn_bpdu(int port_no, Tcn_bpdu *bpdu)
+{
+struct sk_buff *skb;
+struct device *dev = port_info[port_no].dev;
+int size;
+unsigned long flags;
+
+ if (port_info[port_no].state == Disabled) {
+ printk("send_tcn_bpdu: port %i not valid\n",port_no);
+ return(-1);
+ }
+ if (br_stats.flags & BR_DEBUG)
+ printk("send_tcn_bpdu: ");
+ size = sizeof(Tcn_bpdu) + dev->hard_header_len;
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (skb == NULL) {
+ printk("send_tcn_bpdu: no skb available\n");
+ return(-1);
+ }
+ skb->dev = dev;
+ skb->free = 1;
+ skb->h.eth = (struct ethhdr *)skb_put(skb,size);
+ memcpy(skb->h.eth->h_dest, bridge_ula, ETH_ALEN);
+ memcpy(skb->h.eth->h_source, dev->dev_addr, ETH_ALEN);
+ if (br_stats.flags & BR_DEBUG)
+ printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
+ dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ port_no,
+ skb->h.eth->h_source[0],
+ skb->h.eth->h_source[1],
+ skb->h.eth->h_source[2],
+ skb->h.eth->h_source[3],
+ skb->h.eth->h_source[4],
+ skb->h.eth->h_source[5],
+ skb->h.eth->h_dest[0],
+ skb->h.eth->h_dest[1],
+ skb->h.eth->h_dest[2],
+ skb->h.eth->h_dest[3],
+ skb->h.eth->h_dest[4],
+ skb->h.eth->h_dest[5]);
+ skb->h.eth->h_proto = 0x8038; /* XXX verify */
+
+ skb->h.raw += skb->dev->hard_header_len;
+ memcpy(skb->h.raw, bpdu, sizeof(Tcn_bpdu));
+
+ /* mark that's we've been here... */
+ skb->pkt_bridged = IS_BRIDGED;
+ skb->arp = 1; /* do not resolve... */
+ skb->h.raw = skb->data + ETH_HLEN;
+ save_flags(flags);
+ cli();
+ skb_queue_tail(dev->buffs, skb);
+ restore_flags(flags);
+ return(0);
+}
+
+static int
+br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
+{
+ struct device *dev = ptr;
+ int i;
+
+ /* check for loopback devices */
+ if (dev->flags & IFF_LOOPBACK)
+ return(NOTIFY_DONE);
+
+ switch (event) {
+ case NETDEV_DOWN:
+ if (br_stats.flags & BR_DEBUG)
+ printk("br_device_event: NETDEV_DOWN...\n");
+ /* find our device and mark it down */
+ for (i = One; i <= No_of_ports; i++) {
+ if (port_info[i].dev == dev) {
+ disable_port(i);
+ return NOTIFY_DONE;
+ break;
+ }
+ }
+ break;
+ case NETDEV_UP:
+ if (br_stats.flags & BR_DEBUG)
+ printk("br_device_event: NETDEV_UP...\n");
+ /* Only handle ethernet ports */
+ if(dev->type!=ARPHRD_ETHER && dev->type!=ARPHRD_LOOPBACK)
+ return NOTIFY_DONE;
+ /* look up an unused device and enable it */
+ for (i = One; i <= No_of_ports; i++) {
+ if ((port_info[i].dev == (struct device *)0) ||
+ (port_info[i].dev == dev)) {
+ port_info[i].dev = dev;
+ enable_port(i);
+ set_path_cost(i, br_port_cost(dev));
+ set_port_priority(i, 128);
+ port_info[i].port_id = i;
+ /* set bridge addr from 1st device addr */
+ if ((bridge_info.bridge_id.BRIDGE_ID[0] == 0) &&
+ (bridge_info.bridge_id.BRIDGE_ID[1] == 0)) {
+ memcpy(bridge_info.bridge_id.BRIDGE_ID_ULA, dev->dev_addr, 6);
+ bridge_info.bridge_id.BRIDGE_PRIORITY = port_info[i].port_id;
+ set_bridge_priority(&bridge_info.bridge_id);
+ }
+ make_forwarding(i);
+ return NOTIFY_DONE;
+ break;
+ }
+ }
+ break;
+ default:
+ printk("br_device_event: unknown event [%x]\n",
+ (unsigned int)event);
+ }
+ return NOTIFY_DONE;
+}
+
+/*
+ * following routine is called when a frame is received
+ * from an interface, it returns 1 when it consumes the
+ * frame, 0 when it does not
+ */
+
+int
+br_receive_frame(struct sk_buff *skb) /* 3.5 */
+{
+ int port;
+
+ if (br_stats.flags & BR_DEBUG)
+ printk("br_receive_frame: ");
+ /* sanity */
+ if (!skb) {
+ printk("no skb!\n");
+ return(1);
+ }
+ /* check for loopback */
+ if (skb->dev->flags & IFF_LOOPBACK)
+ return(0);
+
+ port = find_port(skb->dev);
+ skb->h.raw = skb->data;
+ if (br_stats.flags & BR_DEBUG)
+ printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
+ dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ port,
+ skb->h.eth->h_source[0],
+ skb->h.eth->h_source[1],
+ skb->h.eth->h_source[2],
+ skb->h.eth->h_source[3],
+ skb->h.eth->h_source[4],
+ skb->h.eth->h_source[5],
+ skb->h.eth->h_dest[0],
+ skb->h.eth->h_dest[1],
+ skb->h.eth->h_dest[2],
+ skb->h.eth->h_dest[3],
+ skb->h.eth->h_dest[4],
+ skb->h.eth->h_dest[5]);
+
+ if (!port) {
+ printk("\nbr_receive_frame: no port!\n");
+ return(0);
+ }
+
+ switch (port_info[port].state) {
+ case Learning:
+ (void) br_learn(skb, port); /* 3.8 */
+ /* fall through */
+ case Listening:
+ /* process BPDUs */
+ if (memcmp(skb->h.eth->h_dest, bridge_ula, 6) == 0) {
+ br_bpdu(skb);
+ return(1); /* br_bpdu consumes skb */
+ }
+ /* fall through */
+ case Blocking:
+ /* fall through */
+ case Disabled:
+ /* should drop frames, but for now, we let
+ * them get passed up to the next higher layer
+ return(br_drop(skb));
+ */
+ return(0); /* pass frame up stack */
+ break;
+ case Forwarding:
+ (void) br_learn(skb, port); /* 3.8 */
+ /* process BPDUs */
+ if (memcmp(skb->h.eth->h_dest, bridge_ula,
+ ETH_ALEN) == 0) {
+ printk("frame bpdu processor for me!!!\n");
+ br_bpdu(skb);
+ return(1); /* br_bpdu consumes skb */
+ }
+ /* is frame for me? */
+ if (memcmp(skb->h.eth->h_dest,
+ port_info[port].dev->dev_addr,
+ ETH_ALEN) == 0) {
+ return(0); /* pass frame up our stack (this will */
+ /* happen in net_bh() in dev.c) */
+ }
+ /* ok, forward this frame... */
+ return(br_forward(skb, port));
+ default:
+ printk("br_receive_frame: port [%i] unknown state [%i]\n",
+ port, port_info[port].state);
+ return(0); /* pass frame up stack? */
+ }
+}
+
+/*
+ * the following routine is called to transmit frames from the host
+ * stack. it returns 1 when it consumes the frame and
+ * 0 when it does not.
+ */
+
+int
+br_tx_frame(struct sk_buff *skb) /* 3.5 */
+{
+ int port;
+
+ /* sanity */
+ if (!skb) {
+ printk("br_tx_frame: no skb!\n");
+ return(0);
+ }
+ /* check for loopback */
+ if (skb->dev->flags & IFF_LOOPBACK)
+ return(0);
+
+ skb->h.raw = skb->data;
+ port = 0; /* an impossible port */
+ if (br_stats.flags & BR_DEBUG)
+ printk("br_tx_fr : port %i src %02x:%02x:%02x:%02x:%02x:%02x\
+ dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ port,
+ skb->h.eth->h_source[0],
+ skb->h.eth->h_source[1],
+ skb->h.eth->h_source[2],
+ skb->h.eth->h_source[3],
+ skb->h.eth->h_source[4],
+ skb->h.eth->h_source[5],
+ skb->h.eth->h_dest[0],
+ skb->h.eth->h_dest[1],
+ skb->h.eth->h_dest[2],
+ skb->h.eth->h_dest[3],
+ skb->h.eth->h_dest[4],
+ skb->h.eth->h_dest[5]);
+ return(br_forward(skb, port));
+}
+
+/*
+ * this routine returns 0 when it learns (or updates) from the
+ * frame, and -1 if the frame is simply discarded due to port
+ * state or lack of resources...
+ */
+
+int
+br_learn(struct sk_buff *skb, int port) /* 3.8 */
+{
+ struct fdb *f;
+
+ switch (port_info[port].state) {
+ case Listening:
+ case Blocking:
+ case Disabled:
+ default:
+ return(-1);
+ /* break; */
+ case Learning:
+ case Forwarding:
+ /* don't keep group addresses in the tree */
+ if (skb->h.eth->h_source[0] & 0x01)
+ return(-1);
+
+ f = (struct fdb *)kmalloc(sizeof(struct fdb),
+ GFP_ATOMIC);
+
+ if (!f) {
+ printk("br_learn: unable to malloc fdb\n");
+ return(-1);
+ }
+ f->port = port; /* source port */
+ memcpy(f->ula, skb->h.eth->h_source, 6);
+ f->timer = CURRENT_TIME;
+ f->flags = FDB_ENT_VALID;
+ /*
+ * add entity to AVL tree. If entity already
+ * exists in the tree, update the fields with
+ * what we have here.
+ */
+ if (br_avl_insert(f) == 0) { /* update */
+ kfree(f);
+ return(0);
+ }
+ /* add to head of port chain */
+ f->fdb_next = port_info[port].fdb;
+ port_info[port].fdb = f;
+ return(0);
+ /* break */
+ }
+}
+
+/*
+ * this routine always consumes the frame
+ */
+
+int
+br_drop(struct sk_buff *skb)
+{
+ kfree_skb(skb, 0);
+ return(1);
+}
+
+/*
+ * this routine returns 1 if it consumes the frame, 0
+ * if not...
+ */
+
+int
+br_forward(struct sk_buff *skb, int port) /* 3.7 */
+{
+struct fdb *f;
+unsigned long flags;
+
+ /*
+ * flood all ports with frames destined for a group
+ * address. If frame came from above, drop it,
+ * otherwise it will be handled in br_receive_frame()
+ * Multicast frames will also need to be seen
+ * by our upper layers.
+ */
+ if (skb->h.eth->h_dest[0] & 0x01) { /* group address */
+ br_flood(skb, port);
+ if (port == 0) /* locally generated */
+ return(br_drop(skb));
+ return(0);
+ } else {
+ /* locate port to forward to */
+ f = br_avl_find_addr(skb->h.eth->h_dest);
+ if (!f | !(f->flags & FDB_ENT_VALID)) {
+ /* not found; flood all ports */
+ br_flood(skb, port);
+ return(br_drop(skb));
+ }
+ if (port_info[f->port].state == Forwarding) {
+ /* has entry expired? */
+ if (f->timer + fdb_aging_time < CURRENT_TIME) {
+ /* timer expired, invalidate entry */
+ f->flags &= ~FDB_ENT_VALID;
+ if (br_stats.flags & BR_DEBUG)
+ printk("fdb entry expired...\n");
+ br_flood(skb, port);
+ return(br_drop(skb));
+ }
+ /* mark that's we've been here... */
+ skb->pkt_bridged = IS_BRIDGED;
+
+ /*
+ * if the frame is originating in this host,
+ * we may need to resolve the outgoing address
+ if (port != 0)
+ skb->arp = 1;
+ */
+
+ /* reset the skb->ip pointer */
+ skb->h.raw = skb->data + ETH_HLEN;
+
+ /* we must unlock the skb before requeueing it... */
+ if (skb_device_locked(skb))
+ skb_device_unlock(skb);
+
+ save_flags(flags); /* enter critical section */
+ cli();
+ skb_queue_head(port_info[f->port].dev->buffs, skb);
+ restore_flags(flags); /* exit critical section */
+ return(1); /* skb has been consumed */
+ } else {
+ return(br_drop(skb));
+ }
+ }
+}
+
+/*
+ * this routine sends a copy of the frame to all forwarding ports
+ * with the exception of the port given. This routine never
+ * consumes the original frame.
+ */
+
+int
+br_flood(struct sk_buff *skb, int port)
+{
+int i;
+struct sk_buff *nskb;
+unsigned long flags;
+
+ for (i = One; i <= No_of_ports; i++) {
+ if (i == port)
+ continue;
+ if (port_info[i].state == Forwarding) {
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ /* mark that's we've been here... */
+ nskb->pkt_bridged = IS_BRIDGED;
+ /*
+ * if the frame is originating in this host,
+ * we may need to resolve the outgoing address
+ if (port != 0)
+ nskb->arp = 1;
+ */
+ nskb->h.raw = nskb->data + ETH_HLEN;
+ save_flags(flags);
+ cli();
+ skb_queue_tail(port_info[i].dev->buffs, nskb);
+ restore_flags(flags);
+ }
+ }
+ return(0);
+}
+
+int
+find_port(struct device *dev)
+{
+int i;
+
+ for (i = One; i <= No_of_ports; i++)
+ if ((port_info[i].dev == dev) &&
+ (port_info[i].state != Disabled))
+ return(i);
+ return(0);
+}
+
+int
+br_port_cost(struct device *dev) /* 4.10.2 */
+{
+ if (strncmp(dev->name, "eth", 3) == 0) /* ethernet */
+ return(100);
+ if (strncmp(dev->name, "wic", 3) == 0) /* wic */
+ return(1600);
+ if (strncmp(dev->name, "plip",4) == 0) /* plip */
+ return (1600);
+ return(100); /* default */
+}
+
+/*
+ * this routine always consumes the skb
+ */
+
+void
+br_bpdu(struct sk_buff *skb) /* consumes skb */
+{
+Tcn_bpdu *bpdu;
+int port;
+
+ port = find_port(skb->dev);
+ if (port == 0) { /* unknown port */
+ br_drop(skb);
+ return;
+ }
+
+ bpdu = (Tcn_bpdu *)skb->data + ETH_HLEN;
+ switch (bpdu->type) {
+ case BPDU_TYPE_CONFIG:
+ received_config_bpdu(port, (Config_bpdu *)bpdu);
+ break;
+ case BPDU_TYPE_TOPO_CHANGE:
+ received_tcn_bpdu(port, bpdu);
+ break;
+ default:
+ printk("br_bpdu: received unknown bpdu, type = %i\n",
+ bpdu->type);
+ /* break; */
+ }
+ br_drop(skb);
+}
+
+int
+br_ioctl(unsigned int cmd, void *arg)
+{
+ int err;
+ struct br_cf bcf;
+ int i;
+
+ switch(cmd)
+ {
+ case SIOCGIFBR: /* get bridging control blocks */
+ err = verify_area(VERIFY_WRITE, arg,
+ sizeof(struct br_stat));
+ if(err)
+ return err;
+ memcpy(&br_stats.bridge_data, &bridge_info, sizeof(Bridge_data));
+ memcpy(&br_stats.port_data, &port_info, sizeof(Port_data)*No_of_ports);
+ memcpy_tofs(arg, &br_stats, sizeof(struct br_stat));
+ return(0);
+ case SIOCSIFBR:
+ if (!suser())
+ return -EPERM;
+ err = verify_area(VERIFY_READ, arg,
+ sizeof(struct br_cf));
+ if(err)
+ return err;
+ memcpy_fromfs(&bcf, arg, sizeof(struct br_cf));
+ switch (bcf.cmd) {
+ case BRCMD_BRIDGE_ENABLE:
+ if (br_stats.flags & BR_UP)
+ return(-EALREADY);
+ printk("br: enabling bridging function\n");
+ register_netdevice_notifier(&br_dev_notifier);
+ br_stats.flags |= BR_UP; /* enable bridge */
+ start_hello_timer();
+ break;
+ case BRCMD_BRIDGE_DISABLE:
+ if (!(br_stats.flags & BR_UP))
+ return(-EALREADY);
+ printk("br: disabling bridging function\n");
+ unregister_netdevice_notifier(&br_dev_notifier);
+ br_stats.flags &= ~BR_UP; /* disable bridge */
+ stop_hello_timer();
+ for (i = One; i <= No_of_ports; i++)
+ if (port_info[i].state != Disabled)
+ disable_port(i);
+ break;
+ case BRCMD_PORT_ENABLE:
+ if (port_info[bcf.arg1].dev == 0)
+ return(-EINVAL);
+ if (port_info[bcf.arg1].state != Disabled)
+ return(-EALREADY);
+ printk("br: enabling port %i\n",bcf.arg1);
+ enable_port(bcf.arg1);
+ break;
+ case BRCMD_PORT_DISABLE:
+ if (port_info[bcf.arg1].dev == 0)
+ return(-EINVAL);
+ if (port_info[bcf.arg1].state == Disabled)
+ return(-EALREADY);
+ printk("br: disabling port %i\n",bcf.arg1);
+ disable_port(bcf.arg1);
+ break;
+ case BRCMD_SET_BRIDGE_PRIORITY:
+ set_bridge_priority((bridge_id_t *)&bcf.arg1);
+ break;
+ case BRCMD_SET_PORT_PRIORITY:
+ if (port_info[bcf.arg1].dev == 0)
+ return(-EINVAL);
+ set_port_priority(bcf.arg1, bcf.arg2);
+ break;
+ case BRCMD_SET_PATH_COST:
+ if (port_info[bcf.arg1].dev == 0)
+ return(-EINVAL);
+ set_path_cost(bcf.arg1, bcf.arg2);
+ break;
+ case BRCMD_ENABLE_DEBUG:
+ br_stats.flags |= BR_DEBUG;
+ break;
+ case BRCMD_DISABLE_DEBUG:
+ br_stats.flags &= ~BR_DEBUG;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return(0);
+ default:
+ return -EINVAL;
+ }
+ /*NOTREACHED*/
+ return 0;
+}
+
+int br_cmp(unsigned int *a, unsigned int *b)
+{
+ int i;
+ for (i=0; i<2; i++) {
+ if (a[i] == b[i])
+ continue;
+ if (a[i] < b[i])
+ return(1);
+ if (a[i] > b[i])
+ return(-1);
+ }
+ return(0);
+}
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov
with Sam's (original) version of this