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199 |
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/*
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* Linux NET3 Bridge Support
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*
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* Originally by John Hayes (Network Plumbing).
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* Minor hacks to get it to run with 1.3.x by Alan Cox <Alan.Cox@linux.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Fixes:
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*
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* Todo:
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* Don't bring up devices automatically. Start ports disabled
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* and use a netlink notifier so a daemon can maintain the bridge
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* port group (could we also do multiple groups ????).
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* A nice /proc file interface.
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* Put the path costs in the port info and devices.
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* Put the bridge port number in the device structure for speed.
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* Bridge SNMP stats.
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*
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <net/br.h>
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static int br_device_event(struct notifier_block *dnot, unsigned long event, void *ptr);
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static void br_tick(unsigned long arg);
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int br_forward(struct sk_buff *skb, int port); /* 3.7 */
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int br_port_cost(struct device *dev); /* 4.10.2 */
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void br_bpdu(struct sk_buff *skb); /* consumes skb */
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int br_tx_frame(struct sk_buff *skb);
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int br_cmp(unsigned int *a, unsigned int *b);
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unsigned char bridge_ula[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
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Bridge_data bridge_info; /* (4.5.3) */
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Port_data port_info[All_ports]; /* (4.5.5) */
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Config_bpdu config_bpdu[All_ports];
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Tcn_bpdu tcn_bpdu[All_ports];
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Timer hello_timer; /* (4.5.4.1) */
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Timer tcn_timer; /* (4.5.4.2) */
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Timer topology_change_timer; /* (4.5.4.3) */
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Timer message_age_timer[All_ports]; /* (4.5.6.1) */
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Timer forward_delay_timer[All_ports]; /* (4.5.6.2) */
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Timer hold_timer[All_ports]; /* (4.5.6.3) */
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/* entries timeout after this many seconds */
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unsigned int fdb_aging_time = FDB_TIMEOUT;
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struct br_stat br_stats;
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static struct timer_list tl; /* for 1 second timer... */
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/*
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* the following structure is required so that we receive
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* event notifications when network devices are enabled and
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* disabled (ifconfig up and down).
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*/
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static struct notifier_block br_dev_notifier={
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br_device_event,
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NULL,
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};
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/** Elements of Procedure (4.6) **/
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/*
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* this section of code was graciously borrowed from the IEEE 802.1d
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* specification section 4.9.1 starting on pg 69. It has been
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* modified somewhat to fit within out framework and structure. It
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* implements the spanning tree algorithm that is the heart of the
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* 802.1d bridging protocol.
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*/
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void transmit_config(int port_no) /* (4.6.1) */
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{
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if(!(br_stats.flags & BR_UP))
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return; /* this should not happen but happens */
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if (hold_timer[port_no].active) { /* (4.6.1.3.1) */
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port_info[port_no].config_pending = TRUE; /* (4.6.1.3.1) */
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} else { /* (4.6.1.3.2) */
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config_bpdu[port_no].type = BPDU_TYPE_CONFIG;
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config_bpdu[port_no].root_id = bridge_info.designated_root;
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/* (4.6.1.3.2(1)) */
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config_bpdu[port_no].root_path_cost = bridge_info.root_path_cost;
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/* (4.6.1.3.2(2)) */
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config_bpdu[port_no].bridge_id = bridge_info.bridge_id;
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/* (4.6.1.3.2(3)) */
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config_bpdu[port_no].port_id = port_info[port_no].port_id;
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/*
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* (4.6.1.3.2(4))
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*/
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if (root_bridge()) {
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config_bpdu[port_no].message_age = Zero; /* (4.6.1.3.2(5)) */
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} else {
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config_bpdu[port_no].message_age
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= message_age_timer[bridge_info.root_port].value
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+ Message_age_increment; /* (4.6.1.3.2(6)) */
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}
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config_bpdu[port_no].max_age = bridge_info.max_age; /* (4.6.1.3.2(7)) */
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config_bpdu[port_no].hello_time = bridge_info.hello_time;
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config_bpdu[port_no].forward_delay = bridge_info.forward_delay;
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config_bpdu[port_no].flags = 0;
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config_bpdu[port_no].flags |=
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port_info[port_no].top_change_ack ? TOPOLOGY_CHANGE_ACK : 0;
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/* (4.6.1.3.2(8)) */
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port_info[port_no].top_change_ack = 0;
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/* (4.6.1.3.2(8)) */
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config_bpdu[port_no].flags |=
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bridge_info.top_change ? TOPOLOGY_CHANGE : 0;
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/* (4.6.1.3.2(9)) */
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send_config_bpdu(port_no, &config_bpdu[port_no]);
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port_info[port_no].config_pending = FALSE; /* (4.6.1.3.2(10)) */
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start_hold_timer(port_no); /* (4.6.1.3.2(11)) */
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}
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}
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int root_bridge(void)
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{
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return (br_cmp(bridge_info.designated_root.BRIDGE_ID,
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bridge_info.bridge_id.BRIDGE_ID)?FALSE:TRUE);
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}
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int supersedes_port_info(int port_no, Config_bpdu *config) /* (4.6.2.2) */
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{
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return (
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(br_cmp(config->root_id.BRIDGE_ID,
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port_info[port_no].designated_root.BRIDGE_ID) < 0) /* (4.6.2.2.1) */
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||
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((br_cmp(config->root_id.BRIDGE_ID,
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port_info[port_no].designated_root.BRIDGE_ID) == 0
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)
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&&
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((config->root_path_cost
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< port_info[port_no].designated_cost /* (4.6.2.2.2) */
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)
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||
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((config->root_path_cost
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== port_info[port_no].designated_cost
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)
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&&
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((br_cmp(config->bridge_id.BRIDGE_ID,
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port_info[port_no].designated_bridge.BRIDGE_ID) < 0 /* (4.6.2.2.3) */
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)
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||
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((br_cmp(config->bridge_id.BRIDGE_ID,
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port_info[port_no].designated_bridge.BRIDGE_ID) == 0
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) /* (4.6.2.2.4) */
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&&
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((br_cmp(config->bridge_id.BRIDGE_ID,
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bridge_info.bridge_id.BRIDGE_ID) != 0
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) /* (4.6.2.2.4(1)) */
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||
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(config->port_id <=
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port_info[port_no].designated_port
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) /* (4.6.2.2.4(2)) */
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))))))
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);
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}
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void record_config_information(int port_no, Config_bpdu *config) /* (4.6.2) */
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{
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port_info[port_no].designated_root = config->root_id; /* (4.6.2.3.1) */
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port_info[port_no].designated_cost = config->root_path_cost;
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port_info[port_no].designated_bridge = config->bridge_id;
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port_info[port_no].designated_port = config->port_id;
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start_message_age_timer(port_no, config->message_age); /* (4.6.2.3.2) */
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}
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void record_config_timeout_values(Config_bpdu *config) /* (4.6.3) */
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{
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bridge_info.max_age = config->max_age; /* (4.6.3.3) */
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bridge_info.hello_time = config->hello_time;
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bridge_info.forward_delay = config->forward_delay;
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if (config->flags & TOPOLOGY_CHANGE)
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bridge_info.top_change = 1;
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}
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void config_bpdu_generation(void)
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{ /* (4.6.4) */
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int port_no;
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for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.4.3) */
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if (designated_port(port_no) /* (4.6.4.3) */
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&&
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(port_info[port_no].state != Disabled)
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) {
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transmit_config(port_no); /* (4.6.4.3) */
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} /* (4.6.1.2) */
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}
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}
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int designated_port(int port_no)
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{
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return ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
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bridge_info.bridge_id.BRIDGE_ID) == 0
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)
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&&
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(port_info[port_no].designated_port
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== port_info[port_no].port_id
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)
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);
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}
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void reply(int port_no) /* (4.6.5) */
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{
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transmit_config(port_no); /* (4.6.5.3) */
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}
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void transmit_tcn(void)
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{ /* (4.6.6) */
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int port_no;
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port_no = bridge_info.root_port;
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tcn_bpdu[port_no].type = BPDU_TYPE_TOPO_CHANGE;
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send_tcn_bpdu(port_no, &tcn_bpdu[bridge_info.root_port]); /* (4.6.6.3) */
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}
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void configuration_update(void) /* (4.6.7) */
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{
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root_selection(); /* (4.6.7.3.1) */
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/* (4.6.8.2) */
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designated_port_selection(); /* (4.6.7.3.2) */
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/* (4.6.9.2) */
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}
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| 244 |
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void root_selection(void)
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{ /* (4.6.8) */
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int root_port;
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int port_no;
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root_port = No_port;
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for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.8.3.1) */
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if (((!designated_port(port_no))
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| 252 |
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&&
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| 253 |
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(port_info[port_no].state != Disabled)
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| 254 |
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&&
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| 255 |
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(br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
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bridge_info.bridge_id.BRIDGE_ID) < 0)
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)
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&&
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| 259 |
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((root_port == No_port)
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||
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| 261 |
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(br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
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| 262 |
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port_info[root_port].designated_root.BRIDGE_ID) < 0
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| 263 |
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)
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| 264 |
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||
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| 265 |
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((br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
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| 266 |
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port_info[root_port].designated_root.BRIDGE_ID) == 0
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| 267 |
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)
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| 268 |
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&&
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| 269 |
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(((port_info[port_no].designated_cost
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| 270 |
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+ port_info[port_no].path_cost
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| 271 |
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)
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| 272 |
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<
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| 273 |
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(port_info[root_port].designated_cost
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| 274 |
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+ port_info[root_port].path_cost
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| 275 |
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) /* (4.6.8.3.1(2)) */
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| 276 |
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)
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| 277 |
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||
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| 278 |
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(((port_info[port_no].designated_cost
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| 279 |
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+ port_info[port_no].path_cost
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| 280 |
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)
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| 281 |
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==
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| 282 |
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(port_info[root_port].designated_cost
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| 283 |
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+ port_info[root_port].path_cost
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| 284 |
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)
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| 285 |
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)
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| 286 |
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&&
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| 287 |
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((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
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| 288 |
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port_info[root_port].designated_bridge.BRIDGE_ID) < 0
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| 289 |
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) /* (4.6.8.3.1(3)) */
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| 290 |
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||
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| 291 |
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((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
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| 292 |
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port_info[root_port].designated_bridge.BRIDGE_ID) == 0
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| 293 |
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)
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| 294 |
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&&
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| 295 |
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((port_info[port_no].designated_port
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| 296 |
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< port_info[root_port].designated_port
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| 297 |
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) /* (4.6.8.3.1(4)) */
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| 298 |
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||
|
| 299 |
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((port_info[port_no].designated_port
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| 300 |
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= port_info[root_port].designated_port
|
| 301 |
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)
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| 302 |
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&&
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| 303 |
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(port_info[port_no].port_id
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| 304 |
|
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< port_info[root_port].port_id
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| 305 |
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) /* (4.6.8.3.1(5)) */
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| 306 |
|
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))))))))) {
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| 307 |
|
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root_port = port_no;
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| 308 |
|
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}
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| 309 |
|
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}
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| 310 |
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bridge_info.root_port = root_port; /* (4.6.8.3.1) */
|
| 311 |
|
|
|
| 312 |
|
|
if (root_port == No_port) { /* (4.6.8.3.2) */
|
| 313 |
|
|
bridge_info.designated_root = bridge_info.bridge_id;
|
| 314 |
|
|
/* (4.6.8.3.2(1)) */
|
| 315 |
|
|
bridge_info.root_path_cost = Zero;/* (4.6.8.3.2(2)) */
|
| 316 |
|
|
} else { /* (4.6.8.3.3) */
|
| 317 |
|
|
bridge_info.designated_root = port_info[root_port].designated_root;
|
| 318 |
|
|
/* (4.6.8.3.3(1)) */
|
| 319 |
|
|
bridge_info.root_path_cost = (port_info[root_port].designated_cost
|
| 320 |
|
|
+ port_info[root_port].path_cost
|
| 321 |
|
|
); /* (4.6.8.3.3(2)) */
|
| 322 |
|
|
}
|
| 323 |
|
|
}
|
| 324 |
|
|
|
| 325 |
|
|
void designated_port_selection(void)
|
| 326 |
|
|
{ /* (4.6.9) */
|
| 327 |
|
|
int port_no;
|
| 328 |
|
|
|
| 329 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.6.9.3) */
|
| 330 |
|
|
if (designated_port(port_no) /* (4.6.9.3.1) */
|
| 331 |
|
|
||
|
| 332 |
|
|
(
|
| 333 |
|
|
br_cmp(port_info[port_no].designated_root.BRIDGE_ID,
|
| 334 |
|
|
bridge_info.designated_root.BRIDGE_ID) != 0
|
| 335 |
|
|
)
|
| 336 |
|
|
||
|
| 337 |
|
|
(bridge_info.root_path_cost
|
| 338 |
|
|
< port_info[port_no].designated_cost
|
| 339 |
|
|
) /* (4.6.9.3.3) */
|
| 340 |
|
|
||
|
| 341 |
|
|
((bridge_info.root_path_cost
|
| 342 |
|
|
== port_info[port_no].designated_cost
|
| 343 |
|
|
)
|
| 344 |
|
|
&&
|
| 345 |
|
|
((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
|
| 346 |
|
|
port_info[port_no].designated_bridge.BRIDGE_ID) < 0
|
| 347 |
|
|
) /* (4.6.9.3.4) */
|
| 348 |
|
|
||
|
| 349 |
|
|
((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
|
| 350 |
|
|
port_info[port_no].designated_bridge.BRIDGE_ID) == 0
|
| 351 |
|
|
)
|
| 352 |
|
|
&&
|
| 353 |
|
|
(port_info[port_no].port_id
|
| 354 |
|
|
<= port_info[port_no].designated_port
|
| 355 |
|
|
) /* (4.6.9.3.5) */
|
| 356 |
|
|
)))) {
|
| 357 |
|
|
become_designated_port(port_no); /* (4.6.10.3.2.2) */
|
| 358 |
|
|
}
|
| 359 |
|
|
}
|
| 360 |
|
|
}
|
| 361 |
|
|
|
| 362 |
|
|
void become_designated_port(int port_no)
|
| 363 |
|
|
{ /* (4.6.10) */
|
| 364 |
|
|
|
| 365 |
|
|
/* (4.6.10.3.1) */
|
| 366 |
|
|
port_info[port_no].designated_root = bridge_info.designated_root;
|
| 367 |
|
|
/* (4.6.10.3.2) */
|
| 368 |
|
|
port_info[port_no].designated_cost = bridge_info.root_path_cost;
|
| 369 |
|
|
/* (4.6.10.3.3) */
|
| 370 |
|
|
port_info[port_no].designated_bridge = bridge_info.bridge_id;
|
| 371 |
|
|
/* (4.6.10.3.4) */
|
| 372 |
|
|
port_info[port_no].designated_port = port_info[port_no].port_id;
|
| 373 |
|
|
}
|
| 374 |
|
|
|
| 375 |
|
|
void port_state_selection(void)
|
| 376 |
|
|
{ /* (4.6.11) */
|
| 377 |
|
|
int port_no;
|
| 378 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) {
|
| 379 |
|
|
if (port_no == bridge_info.root_port) { /* (4.6.11.3.1) */
|
| 380 |
|
|
port_info[port_no].config_pending = FALSE; /* (4.6.11.3~1(1)) */
|
| 381 |
|
|
port_info[port_no].top_change_ack = 0;
|
| 382 |
|
|
make_forwarding(port_no); /* (4.6.11.3.1(2)) */
|
| 383 |
|
|
} else if (designated_port(port_no)) { /* (4.6.11.3.2) */
|
| 384 |
|
|
stop_message_age_timer(port_no); /* (4.6.11.3.2(1)) */
|
| 385 |
|
|
make_forwarding(port_no); /* (4.6.11.3.2(2)) */
|
| 386 |
|
|
} else { /* (4.6.11.3.3) */
|
| 387 |
|
|
port_info[port_no].config_pending = FALSE; /* (4.6.11.3.3(1)) */
|
| 388 |
|
|
port_info[port_no].top_change_ack = 0;
|
| 389 |
|
|
make_blocking(port_no); /* (4.6.11.3.3(2)) */
|
| 390 |
|
|
}
|
| 391 |
|
|
}
|
| 392 |
|
|
|
| 393 |
|
|
}
|
| 394 |
|
|
|
| 395 |
|
|
void make_forwarding(int port_no)
|
| 396 |
|
|
{ /* (4.6.12) */
|
| 397 |
|
|
if (port_info[port_no].state == Blocking) { /* (4.6.12.3) */
|
| 398 |
|
|
set_port_state(port_no, Listening); /* (4.6.12.3.1) */
|
| 399 |
|
|
start_forward_delay_timer(port_no); /* (4.6.12.3.2) */
|
| 400 |
|
|
}
|
| 401 |
|
|
}
|
| 402 |
|
|
|
| 403 |
|
|
void topology_change_detection(void)
|
| 404 |
|
|
{ /* (4.6.14) */
|
| 405 |
|
|
if (root_bridge()) { /* (4.6.14.3.1) */
|
| 406 |
|
|
bridge_info.top_change = 1;
|
| 407 |
|
|
start_topology_change_timer(); /* (4.6.14.3.1(2)) */
|
| 408 |
|
|
} else if (!(bridge_info.top_change_detected)) {
|
| 409 |
|
|
transmit_tcn(); /* (4.6.14.3.2(1)) */
|
| 410 |
|
|
start_tcn_timer(); /* (4.6.14.3.2(2)) */
|
| 411 |
|
|
}
|
| 412 |
|
|
bridge_info.top_change = 1;
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
void topology_change_acknowledged(void)
|
| 416 |
|
|
{ /* (4.6.15) */
|
| 417 |
|
|
bridge_info.top_change_detected = 0;
|
| 418 |
|
|
stop_tcn_timer(); /* (4.6.15.3.2) */
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
void acknowledge_topology_change(int port_no)
|
| 422 |
|
|
{ /* (4.6.16) */
|
| 423 |
|
|
port_info[port_no].top_change_ack = 1;
|
| 424 |
|
|
transmit_config(port_no); /* (4.6.16.3.2) */
|
| 425 |
|
|
}
|
| 426 |
|
|
|
| 427 |
|
|
void make_blocking(int port_no) /* (4.6.13) */
|
| 428 |
|
|
{
|
| 429 |
|
|
|
| 430 |
|
|
if ((port_info[port_no].state != Disabled)
|
| 431 |
|
|
&&
|
| 432 |
|
|
(port_info[port_no].state != Blocking)
|
| 433 |
|
|
/* (4.6.13.3) */
|
| 434 |
|
|
) {
|
| 435 |
|
|
if ((port_info[port_no].state == Forwarding)
|
| 436 |
|
|
||
|
| 437 |
|
|
(port_info[port_no].state == Learning)
|
| 438 |
|
|
) {
|
| 439 |
|
|
topology_change_detection(); /* (4.6.13.3.1) */
|
| 440 |
|
|
/* (4.6.14.2.3) */
|
| 441 |
|
|
}
|
| 442 |
|
|
set_port_state(port_no, Blocking);/* (4.6.13.3.2) */
|
| 443 |
|
|
stop_forward_delay_timer(port_no);/* (4.6.13.3.3) */
|
| 444 |
|
|
}
|
| 445 |
|
|
}
|
| 446 |
|
|
|
| 447 |
|
|
void set_port_state(int port_no, int state)
|
| 448 |
|
|
{
|
| 449 |
|
|
port_info[port_no].state = state;
|
| 450 |
|
|
}
|
| 451 |
|
|
|
| 452 |
|
|
void received_config_bpdu(int port_no, Config_bpdu *config) /* (4.7.1) */
|
| 453 |
|
|
{
|
| 454 |
|
|
int root;
|
| 455 |
|
|
|
| 456 |
|
|
root = root_bridge();
|
| 457 |
|
|
if (port_info[port_no].state != Disabled) {
|
| 458 |
|
|
if (supersedes_port_info(port_no, config)) { /* (4.7.1.1) *//* (4.
|
| 459 |
|
|
* 6.2.2) */
|
| 460 |
|
|
record_config_information(port_no, config); /* (4.7.1.1.1) */
|
| 461 |
|
|
/* (4.6.2.2) */
|
| 462 |
|
|
configuration_update(); /* (4.7.1.1.2) */
|
| 463 |
|
|
/* (4.6.7.2.1) */
|
| 464 |
|
|
port_state_selection(); /* (4.7.1.1.3) */
|
| 465 |
|
|
/* (4.6.11.2.1) */
|
| 466 |
|
|
if ((!root_bridge()) && root) { /* (4.7.1.1.4) */
|
| 467 |
|
|
stop_hello_timer();
|
| 468 |
|
|
if (bridge_info.top_change_detected) { /* (4.7.1.1.5~ */
|
| 469 |
|
|
stop_topology_change_timer();
|
| 470 |
|
|
transmit_tcn(); /* (4.6.6.1) */
|
| 471 |
|
|
start_tcn_timer();
|
| 472 |
|
|
}
|
| 473 |
|
|
}
|
| 474 |
|
|
if (port_no == bridge_info.root_port) {
|
| 475 |
|
|
record_config_timeout_values(config); /* (4.7.1.1.6) */
|
| 476 |
|
|
/* (4.6.3.2) */
|
| 477 |
|
|
config_bpdu_generation(); /* (4.6.4.2.1) */
|
| 478 |
|
|
if (config->flags & TOPOLOGY_CHANGE_ACK) { /* (4.7.1.1.7) */
|
| 479 |
|
|
topology_change_acknowledged(); /* (4.6.15.2) */
|
| 480 |
|
|
}
|
| 481 |
|
|
}
|
| 482 |
|
|
} else if (designated_port(port_no)) { /* (4.7.1.2) */
|
| 483 |
|
|
reply(port_no); /* (4.7.1.2.1) */
|
| 484 |
|
|
/* (4.6.5.2) */
|
| 485 |
|
|
}
|
| 486 |
|
|
}
|
| 487 |
|
|
}
|
| 488 |
|
|
|
| 489 |
|
|
void received_tcn_bpdu(int port_no, Tcn_bpdu *tcn) /* (4.7.2) */
|
| 490 |
|
|
{
|
| 491 |
|
|
if (port_info[port_no].state != Disabled) {
|
| 492 |
|
|
if (designated_port(port_no)) {
|
| 493 |
|
|
topology_change_detection(); /* (4.7.2.1) */
|
| 494 |
|
|
/* (4.6.14.2.1) */
|
| 495 |
|
|
acknowledge_topology_change(port_no); /* (4.7.2.2) */
|
| 496 |
|
|
} /* (4.6.16.2) */
|
| 497 |
|
|
}
|
| 498 |
|
|
}
|
| 499 |
|
|
|
| 500 |
|
|
void hello_timer_expiry(void)
|
| 501 |
|
|
{ /* (4.7.3) */
|
| 502 |
|
|
config_bpdu_generation(); /* (4.6.4.2.2) */
|
| 503 |
|
|
start_hello_timer();
|
| 504 |
|
|
}
|
| 505 |
|
|
|
| 506 |
|
|
void message_age_timer_expiry(int port_no) /* (4.7.4) */
|
| 507 |
|
|
{
|
| 508 |
|
|
int root;
|
| 509 |
|
|
root = root_bridge();
|
| 510 |
|
|
|
| 511 |
|
|
become_designated_port(port_no); /* (4.7.4.1) */
|
| 512 |
|
|
/* (4.6.10.2.1) */
|
| 513 |
|
|
configuration_update(); /* (4.7.4.2) */
|
| 514 |
|
|
/* (4.6.7.2.2) */
|
| 515 |
|
|
port_state_selection(); /* (4.7.4.3) */
|
| 516 |
|
|
/* (4.6.11.2.2) */
|
| 517 |
|
|
if ((root_bridge()) && (!root)) { /* (4.7.4.4) */
|
| 518 |
|
|
|
| 519 |
|
|
bridge_info.max_age = bridge_info.bridge_max_age; /* (4.7.4.4.1) */
|
| 520 |
|
|
bridge_info.hello_time = bridge_info.bridge_hello_time;
|
| 521 |
|
|
bridge_info.forward_delay = bridge_info.bridge_forward_delay;
|
| 522 |
|
|
topology_change_detection(); /* (4.7.4.4.2) */
|
| 523 |
|
|
/* (4.6.14.2.4) */
|
| 524 |
|
|
stop_tcn_timer(); /* (4.7.4.4.3) */
|
| 525 |
|
|
config_bpdu_generation(); /* (4.7.4.4.4) */
|
| 526 |
|
|
/* (4.6.4.4.3) */
|
| 527 |
|
|
start_hello_timer();
|
| 528 |
|
|
}
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
void forward_delay_timer_expiry(int port_no) /* (4.7.5) */
|
| 532 |
|
|
{
|
| 533 |
|
|
if (port_info[port_no].state == Listening) { /* (4.7.5.1) */
|
| 534 |
|
|
set_port_state(port_no, Learning); /* (4.7.5.1.1) */
|
| 535 |
|
|
start_forward_delay_timer(port_no); /* (4.7.5.1.2) */
|
| 536 |
|
|
} else if (port_info[port_no].state == Learning) { /* (4.7.5.2) */
|
| 537 |
|
|
set_port_state(port_no, Forwarding); /* (4.7.5.2.1) */
|
| 538 |
|
|
if (designated_for_some_port()) { /* (4.7.5.2.2) */
|
| 539 |
|
|
topology_change_detection(); /* (4.6.14.2.2) */
|
| 540 |
|
|
|
| 541 |
|
|
}
|
| 542 |
|
|
}
|
| 543 |
|
|
}
|
| 544 |
|
|
|
| 545 |
|
|
int designated_for_some_port(void)
|
| 546 |
|
|
{
|
| 547 |
|
|
int port_no;
|
| 548 |
|
|
|
| 549 |
|
|
|
| 550 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) {
|
| 551 |
|
|
if ((br_cmp(port_info[port_no].designated_bridge.BRIDGE_ID,
|
| 552 |
|
|
bridge_info.bridge_id.BRIDGE_ID) == 0)
|
| 553 |
|
|
) {
|
| 554 |
|
|
return (TRUE);
|
| 555 |
|
|
}
|
| 556 |
|
|
}
|
| 557 |
|
|
return (FALSE);
|
| 558 |
|
|
}
|
| 559 |
|
|
|
| 560 |
|
|
void tcn_timer_expiry(void)
|
| 561 |
|
|
{ /* (4.7.6) */
|
| 562 |
|
|
transmit_tcn(); /* (4.7.6.1) */
|
| 563 |
|
|
start_tcn_timer(); /* (4.7.6.2) */
|
| 564 |
|
|
}
|
| 565 |
|
|
|
| 566 |
|
|
void topology_change_timer_expiry(void)
|
| 567 |
|
|
{ /* (4.7.7) */
|
| 568 |
|
|
bridge_info.top_change_detected = 0;
|
| 569 |
|
|
bridge_info.top_change = 0;
|
| 570 |
|
|
/* (4.7.7.2) */
|
| 571 |
|
|
}
|
| 572 |
|
|
|
| 573 |
|
|
void hold_timer_expiry(int port_no) /* (4.7.8) */
|
| 574 |
|
|
{
|
| 575 |
|
|
if (port_info[port_no].config_pending) {
|
| 576 |
|
|
transmit_config(port_no); /* (4.7.8.1) */
|
| 577 |
|
|
} /* (4.6.1.2.3) */
|
| 578 |
|
|
}
|
| 579 |
|
|
|
| 580 |
|
|
void br_init(void)
|
| 581 |
|
|
{ /* (4.8.1) */
|
| 582 |
|
|
int port_no;
|
| 583 |
|
|
|
| 584 |
|
|
printk(KERN_INFO "Ethernet Bridge 002 for NET3.035 (Linux 2.0)\n");
|
| 585 |
|
|
bridge_info.designated_root = bridge_info.bridge_id; /* (4.8.1.1) */
|
| 586 |
|
|
bridge_info.root_path_cost = Zero;
|
| 587 |
|
|
bridge_info.root_port = No_port;
|
| 588 |
|
|
|
| 589 |
|
|
bridge_info.bridge_max_age = BRIDGE_MAX_AGE;
|
| 590 |
|
|
bridge_info.bridge_hello_time = BRIDGE_HELLO_TIME;
|
| 591 |
|
|
bridge_info.bridge_forward_delay = BRIDGE_FORWARD_DELAY;
|
| 592 |
|
|
bridge_info.hold_time = HOLD_TIME;
|
| 593 |
|
|
|
| 594 |
|
|
bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.1.2) */
|
| 595 |
|
|
bridge_info.hello_time = bridge_info.bridge_hello_time;
|
| 596 |
|
|
bridge_info.forward_delay = bridge_info.bridge_forward_delay;
|
| 597 |
|
|
|
| 598 |
|
|
bridge_info.top_change_detected = 0;
|
| 599 |
|
|
bridge_info.top_change = 0;
|
| 600 |
|
|
stop_tcn_timer();
|
| 601 |
|
|
stop_topology_change_timer();
|
| 602 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.8.1.4) */
|
| 603 |
|
|
br_init_port(port_no);
|
| 604 |
|
|
disable_port(port_no);
|
| 605 |
|
|
}
|
| 606 |
|
|
port_state_selection(); /* (4.8.1.5) */
|
| 607 |
|
|
config_bpdu_generation(); /* (4.8.1.6) */
|
| 608 |
|
|
|
| 609 |
|
|
/* initialize system timer */
|
| 610 |
|
|
tl.expires = jiffies+HZ; /* 1 second */
|
| 611 |
|
|
tl.function = br_tick;
|
| 612 |
|
|
add_timer(&tl);
|
| 613 |
|
|
|
| 614 |
|
|
register_netdevice_notifier(&br_dev_notifier);
|
| 615 |
|
|
br_stats.flags = 0; /*BR_UP | BR_DEBUG*/; /* enable bridge */
|
| 616 |
|
|
/*start_hello_timer();*/
|
| 617 |
|
|
}
|
| 618 |
|
|
|
| 619 |
|
|
void br_init_port(int port_no)
|
| 620 |
|
|
{
|
| 621 |
|
|
become_designated_port(port_no); /* (4.8.1.4.1) */
|
| 622 |
|
|
set_port_state(port_no, Blocking); /* (4.8.1.4.2) */
|
| 623 |
|
|
port_info[port_no].top_change_ack = 0;
|
| 624 |
|
|
port_info[port_no].config_pending = FALSE;/* (4.8.1.4.4) */
|
| 625 |
|
|
stop_message_age_timer(port_no); /* (4.8.1.4.5) */
|
| 626 |
|
|
stop_forward_delay_timer(port_no); /* (4.8.1.4.6) */
|
| 627 |
|
|
stop_hold_timer(port_no); /* (4.8.1.4.7) */
|
| 628 |
|
|
}
|
| 629 |
|
|
|
| 630 |
|
|
void enable_port(int port_no) /* (4.8.2) */
|
| 631 |
|
|
{
|
| 632 |
|
|
br_init_port(port_no);
|
| 633 |
|
|
port_state_selection(); /* (4.8.2.7) */
|
| 634 |
|
|
} /* */
|
| 635 |
|
|
|
| 636 |
|
|
void disable_port(int port_no) /* (4.8.3) */
|
| 637 |
|
|
{
|
| 638 |
|
|
int root;
|
| 639 |
|
|
|
| 640 |
|
|
root = root_bridge();
|
| 641 |
|
|
become_designated_port(port_no); /* (4.8.3.1) */
|
| 642 |
|
|
set_port_state(port_no, Disabled); /* (4.8.3.2) */
|
| 643 |
|
|
port_info[port_no].top_change_ack = 0;
|
| 644 |
|
|
port_info[port_no].config_pending = FALSE;/* (4.8.3.4) */
|
| 645 |
|
|
stop_message_age_timer(port_no); /* (4.8.3.5) */
|
| 646 |
|
|
stop_forward_delay_timer(port_no); /* (4.8.3.6) */
|
| 647 |
|
|
configuration_update();
|
| 648 |
|
|
port_state_selection(); /* (4.8.3.7) */
|
| 649 |
|
|
if ((root_bridge()) && (!root)) { /* (4.8.3.8) */
|
| 650 |
|
|
bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.3.8.1) */
|
| 651 |
|
|
bridge_info.hello_time = bridge_info.bridge_hello_time;
|
| 652 |
|
|
bridge_info.forward_delay = bridge_info.bridge_forward_delay;
|
| 653 |
|
|
topology_change_detection(); /* (4.8.3.8.2) */
|
| 654 |
|
|
stop_tcn_timer(); /* (4.8.3.8.3) */
|
| 655 |
|
|
config_bpdu_generation(); /* (4.8.3.8.4) */
|
| 656 |
|
|
start_hello_timer();
|
| 657 |
|
|
}
|
| 658 |
|
|
}
|
| 659 |
|
|
|
| 660 |
|
|
|
| 661 |
|
|
void set_bridge_priority(bridge_id_t *new_bridge_id) /* (4.8.4) */
|
| 662 |
|
|
{
|
| 663 |
|
|
|
| 664 |
|
|
int root;
|
| 665 |
|
|
int port_no;
|
| 666 |
|
|
root = root_bridge();
|
| 667 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.8.4.2) */
|
| 668 |
|
|
if (designated_port(port_no)) {
|
| 669 |
|
|
port_info[port_no].designated_bridge = *new_bridge_id;
|
| 670 |
|
|
}
|
| 671 |
|
|
}
|
| 672 |
|
|
|
| 673 |
|
|
bridge_info.bridge_id = *new_bridge_id; /* (4.8.4.3) */
|
| 674 |
|
|
configuration_update(); /* (4.8.4.4) */
|
| 675 |
|
|
port_state_selection(); /* (4.8.4.5) */
|
| 676 |
|
|
if ((root_bridge()) && (!root)) { /* (4.8.4.6) */
|
| 677 |
|
|
bridge_info.max_age = bridge_info.bridge_max_age; /* (4.8.4.6.1) */
|
| 678 |
|
|
bridge_info.hello_time = bridge_info.bridge_hello_time;
|
| 679 |
|
|
bridge_info.forward_delay = bridge_info.bridge_forward_delay;
|
| 680 |
|
|
topology_change_detection(); /* (4.8.4.6.2) */
|
| 681 |
|
|
stop_tcn_timer(); /* (4.8.4.6.3) */
|
| 682 |
|
|
config_bpdu_generation(), /* (4.8.4.6.4) */
|
| 683 |
|
|
start_hello_timer();
|
| 684 |
|
|
}
|
| 685 |
|
|
}
|
| 686 |
|
|
|
| 687 |
|
|
void set_port_priority(int port_no, unsigned short new_port_id) /* (4.8.5) */
|
| 688 |
|
|
{
|
| 689 |
|
|
if (designated_port(port_no)) { /* (4.8.5.2) */
|
| 690 |
|
|
port_info[port_no].designated_port = new_port_id;
|
| 691 |
|
|
}
|
| 692 |
|
|
port_info[port_no].port_id = new_port_id; /* (4.8.5.3) */
|
| 693 |
|
|
if ((br_cmp(bridge_info.bridge_id.BRIDGE_ID,
|
| 694 |
|
|
port_info[port_no].designated_bridge.BRIDGE_ID) == 0
|
| 695 |
|
|
)
|
| 696 |
|
|
&&
|
| 697 |
|
|
(port_info[port_no].port_id
|
| 698 |
|
|
< port_info[port_no].designated_port
|
| 699 |
|
|
|
| 700 |
|
|
)
|
| 701 |
|
|
) {
|
| 702 |
|
|
become_designated_port(port_no); /* (4.8.5.4.1) */
|
| 703 |
|
|
port_state_selection(); /* (4.8.5.4.2) */
|
| 704 |
|
|
}
|
| 705 |
|
|
}
|
| 706 |
|
|
|
| 707 |
|
|
void set_path_cost(int port_no, unsigned short path_cost) /* (4.8.6) */
|
| 708 |
|
|
{
|
| 709 |
|
|
port_info[port_no].path_cost = path_cost; /* (4.8.6.1) */
|
| 710 |
|
|
configuration_update(); /* (4.8.6.2) */
|
| 711 |
|
|
port_state_selection(); /* (4.8.6.3) */
|
| 712 |
|
|
}
|
| 713 |
|
|
|
| 714 |
|
|
static void br_tick(unsigned long arg)
|
| 715 |
|
|
{
|
| 716 |
|
|
int port_no;
|
| 717 |
|
|
|
| 718 |
|
|
if (hello_timer_expired()) {
|
| 719 |
|
|
hello_timer_expiry();
|
| 720 |
|
|
}
|
| 721 |
|
|
if (tcn_timer_expired()) {
|
| 722 |
|
|
tcn_timer_expiry();
|
| 723 |
|
|
}
|
| 724 |
|
|
if (topology_change_timer_expired()) {
|
| 725 |
|
|
topology_change_timer_expiry();
|
| 726 |
|
|
}
|
| 727 |
|
|
for (port_no = One; port_no <= No_of_ports; port_no++) {
|
| 728 |
|
|
if (forward_delay_timer_expired(port_no)) {
|
| 729 |
|
|
forward_delay_timer_expiry(port_no);
|
| 730 |
|
|
}
|
| 731 |
|
|
if (message_age_timer_expired(port_no)) {
|
| 732 |
|
|
message_age_timer_expiry(port_no);
|
| 733 |
|
|
}
|
| 734 |
|
|
if (hold_timer_expired(port_no)) {
|
| 735 |
|
|
hold_timer_expiry(port_no);
|
| 736 |
|
|
}
|
| 737 |
|
|
}
|
| 738 |
|
|
/* call me again sometime... */
|
| 739 |
|
|
tl.expires = jiffies+HZ; /* 1 second */
|
| 740 |
|
|
tl.function = br_tick;
|
| 741 |
|
|
add_timer(&tl);
|
| 742 |
|
|
}
|
| 743 |
|
|
|
| 744 |
|
|
void start_hello_timer(void)
|
| 745 |
|
|
{
|
| 746 |
|
|
hello_timer.value = 0;
|
| 747 |
|
|
hello_timer.active = TRUE;
|
| 748 |
|
|
}
|
| 749 |
|
|
|
| 750 |
|
|
void stop_hello_timer(void)
|
| 751 |
|
|
{
|
| 752 |
|
|
hello_timer.active = FALSE;
|
| 753 |
|
|
}
|
| 754 |
|
|
|
| 755 |
|
|
int hello_timer_expired(void)
|
| 756 |
|
|
{
|
| 757 |
|
|
if (hello_timer.active && (++hello_timer.value >= bridge_info.hello_time)) {
|
| 758 |
|
|
hello_timer.active = FALSE;
|
| 759 |
|
|
return (TRUE);
|
| 760 |
|
|
}
|
| 761 |
|
|
return (FALSE);
|
| 762 |
|
|
}
|
| 763 |
|
|
|
| 764 |
|
|
void start_tcn_timer(void)
|
| 765 |
|
|
{
|
| 766 |
|
|
tcn_timer.value = 0;
|
| 767 |
|
|
tcn_timer.active = TRUE;
|
| 768 |
|
|
}
|
| 769 |
|
|
|
| 770 |
|
|
void stop_tcn_timer(void)
|
| 771 |
|
|
{
|
| 772 |
|
|
tcn_timer.active = FALSE;
|
| 773 |
|
|
}
|
| 774 |
|
|
|
| 775 |
|
|
int tcn_timer_expired(void)
|
| 776 |
|
|
{
|
| 777 |
|
|
if (tcn_timer.active && (++tcn_timer.value >=
|
| 778 |
|
|
bridge_info.bridge_hello_time)) {
|
| 779 |
|
|
tcn_timer.active = FALSE;
|
| 780 |
|
|
return (TRUE);
|
| 781 |
|
|
}
|
| 782 |
|
|
return (FALSE);
|
| 783 |
|
|
|
| 784 |
|
|
}
|
| 785 |
|
|
|
| 786 |
|
|
void start_topology_change_timer(void)
|
| 787 |
|
|
{
|
| 788 |
|
|
topology_change_timer.value = 0;
|
| 789 |
|
|
topology_change_timer.active = TRUE;
|
| 790 |
|
|
}
|
| 791 |
|
|
|
| 792 |
|
|
void stop_topology_change_timer(void)
|
| 793 |
|
|
{
|
| 794 |
|
|
topology_change_timer.active = FALSE;
|
| 795 |
|
|
}
|
| 796 |
|
|
|
| 797 |
|
|
int topology_change_timer_expired(void)
|
| 798 |
|
|
{
|
| 799 |
|
|
if (topology_change_timer.active
|
| 800 |
|
|
&& (++topology_change_timer.value
|
| 801 |
|
|
>= bridge_info.topology_change_time
|
| 802 |
|
|
)) {
|
| 803 |
|
|
topology_change_timer.active = FALSE;
|
| 804 |
|
|
return (TRUE);
|
| 805 |
|
|
}
|
| 806 |
|
|
return (FALSE);
|
| 807 |
|
|
}
|
| 808 |
|
|
|
| 809 |
|
|
void start_message_age_timer(int port_no, unsigned short message_age)
|
| 810 |
|
|
{
|
| 811 |
|
|
message_age_timer[port_no].value = message_age;
|
| 812 |
|
|
message_age_timer[port_no].active = TRUE;
|
| 813 |
|
|
}
|
| 814 |
|
|
|
| 815 |
|
|
void stop_message_age_timer(int port_no)
|
| 816 |
|
|
{
|
| 817 |
|
|
message_age_timer[port_no].active = FALSE;
|
| 818 |
|
|
}
|
| 819 |
|
|
|
| 820 |
|
|
int message_age_timer_expired(int port_no)
|
| 821 |
|
|
{
|
| 822 |
|
|
if (message_age_timer[port_no].active &&
|
| 823 |
|
|
(++message_age_timer[port_no].value >= bridge_info.max_age)) {
|
| 824 |
|
|
message_age_timer[port_no].active = FALSE;
|
| 825 |
|
|
return (TRUE);
|
| 826 |
|
|
}
|
| 827 |
|
|
return (FALSE);
|
| 828 |
|
|
}
|
| 829 |
|
|
|
| 830 |
|
|
void start_forward_delay_timer(int port_no)
|
| 831 |
|
|
{
|
| 832 |
|
|
forward_delay_timer[port_no].value = 0;
|
| 833 |
|
|
forward_delay_timer[port_no].active = TRUE;
|
| 834 |
|
|
}
|
| 835 |
|
|
|
| 836 |
|
|
void stop_forward_delay_timer(int port_no)
|
| 837 |
|
|
{
|
| 838 |
|
|
forward_delay_timer[port_no].active = FALSE;
|
| 839 |
|
|
}
|
| 840 |
|
|
|
| 841 |
|
|
int forward_delay_timer_expired(int port_no)
|
| 842 |
|
|
{
|
| 843 |
|
|
if (forward_delay_timer[port_no].active &&
|
| 844 |
|
|
(++forward_delay_timer[port_no].value >= bridge_info.forward_delay)) {
|
| 845 |
|
|
forward_delay_timer[port_no].active = FALSE;
|
| 846 |
|
|
return (TRUE);
|
| 847 |
|
|
}
|
| 848 |
|
|
return (FALSE);
|
| 849 |
|
|
}
|
| 850 |
|
|
|
| 851 |
|
|
void start_hold_timer(int port_no)
|
| 852 |
|
|
{
|
| 853 |
|
|
hold_timer[port_no].value = 0;
|
| 854 |
|
|
hold_timer[port_no].active = TRUE;
|
| 855 |
|
|
}
|
| 856 |
|
|
|
| 857 |
|
|
void stop_hold_timer(int port_no)
|
| 858 |
|
|
{
|
| 859 |
|
|
hold_timer[port_no].active = FALSE;
|
| 860 |
|
|
}
|
| 861 |
|
|
|
| 862 |
|
|
|
| 863 |
|
|
int hold_timer_expired(int port_no)
|
| 864 |
|
|
{
|
| 865 |
|
|
if (hold_timer[port_no].active &&
|
| 866 |
|
|
(++hold_timer[port_no].value >= bridge_info.hold_time)) {
|
| 867 |
|
|
hold_timer[port_no].active = FALSE;
|
| 868 |
|
|
return (TRUE);
|
| 869 |
|
|
}
|
| 870 |
|
|
return (FALSE);
|
| 871 |
|
|
|
| 872 |
|
|
}
|
| 873 |
|
|
|
| 874 |
|
|
int send_config_bpdu(int port_no, Config_bpdu *config_bpdu)
|
| 875 |
|
|
{
|
| 876 |
|
|
struct sk_buff *skb;
|
| 877 |
|
|
struct device *dev = port_info[port_no].dev;
|
| 878 |
|
|
int size;
|
| 879 |
|
|
|
| 880 |
|
|
if(!(br_stats.flags & BR_UP))
|
| 881 |
|
|
return(-1); /* this should not happen but happens */
|
| 882 |
|
|
if (port_info[port_no].state == Disabled) {
|
| 883 |
|
|
printk(KERN_DEBUG "send_config_bpdu: port %i not valid\n",port_no);
|
| 884 |
|
|
return(-1);
|
| 885 |
|
|
}
|
| 886 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 887 |
|
|
printk("send_config_bpdu: ");
|
| 888 |
|
|
/*
|
| 889 |
|
|
* create and send the message
|
| 890 |
|
|
*/
|
| 891 |
|
|
size = sizeof(Config_bpdu) + dev->hard_header_len;
|
| 892 |
|
|
skb = alloc_skb(size, GFP_ATOMIC);
|
| 893 |
|
|
if (skb == NULL) {
|
| 894 |
|
|
printk(KERN_DEBUG "send_config_bpdu: no skb available\n");
|
| 895 |
|
|
return(-1);
|
| 896 |
|
|
}
|
| 897 |
|
|
skb->dev = dev;
|
| 898 |
|
|
skb->free = 1;
|
| 899 |
|
|
skb->h.eth = (struct ethhdr *)skb_put(skb, size);
|
| 900 |
|
|
memcpy(skb->h.eth->h_dest, bridge_ula, ETH_ALEN);
|
| 901 |
|
|
memcpy(skb->h.eth->h_source, dev->dev_addr, ETH_ALEN);
|
| 902 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 903 |
|
|
printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
|
| 904 |
|
|
dest %02x:%02x:%02x:%02x:%02x:%02x\n",
|
| 905 |
|
|
port_no,
|
| 906 |
|
|
skb->h.eth->h_source[0],
|
| 907 |
|
|
skb->h.eth->h_source[1],
|
| 908 |
|
|
skb->h.eth->h_source[2],
|
| 909 |
|
|
skb->h.eth->h_source[3],
|
| 910 |
|
|
skb->h.eth->h_source[4],
|
| 911 |
|
|
skb->h.eth->h_source[5],
|
| 912 |
|
|
skb->h.eth->h_dest[0],
|
| 913 |
|
|
skb->h.eth->h_dest[1],
|
| 914 |
|
|
skb->h.eth->h_dest[2],
|
| 915 |
|
|
skb->h.eth->h_dest[3],
|
| 916 |
|
|
skb->h.eth->h_dest[4],
|
| 917 |
|
|
skb->h.eth->h_dest[5]);
|
| 918 |
|
|
skb->h.eth->h_proto = htonl(0x8038); /* XXX verify */
|
| 919 |
|
|
|
| 920 |
|
|
skb->h.raw += skb->dev->hard_header_len;
|
| 921 |
|
|
memcpy(skb->h.raw, config_bpdu, sizeof(Config_bpdu));
|
| 922 |
|
|
|
| 923 |
|
|
/* won't get bridged again... */
|
| 924 |
|
|
skb->pkt_bridged = IS_BRIDGED;
|
| 925 |
|
|
skb->arp = 1; /* do not resolve... */
|
| 926 |
|
|
skb->h.raw = skb->data + ETH_HLEN;
|
| 927 |
|
|
dev_queue_xmit(skb, dev, SOPRI_INTERACTIVE);
|
| 928 |
|
|
return(0);
|
| 929 |
|
|
}
|
| 930 |
|
|
|
| 931 |
|
|
int send_tcn_bpdu(int port_no, Tcn_bpdu *bpdu)
|
| 932 |
|
|
{
|
| 933 |
|
|
struct sk_buff *skb;
|
| 934 |
|
|
struct device *dev = port_info[port_no].dev;
|
| 935 |
|
|
int size;
|
| 936 |
|
|
|
| 937 |
|
|
if(!(br_stats.flags & BR_UP))
|
| 938 |
|
|
return(-1); /* this should not happen but happens */
|
| 939 |
|
|
if (port_info[port_no].state == Disabled) {
|
| 940 |
|
|
printk(KERN_DEBUG "send_tcn_bpdu: port %i not valid\n",port_no);
|
| 941 |
|
|
return(-1);
|
| 942 |
|
|
}
|
| 943 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 944 |
|
|
printk("send_tcn_bpdu: ");
|
| 945 |
|
|
size = sizeof(Tcn_bpdu) + dev->hard_header_len;
|
| 946 |
|
|
skb = alloc_skb(size, GFP_ATOMIC);
|
| 947 |
|
|
if (skb == NULL) {
|
| 948 |
|
|
printk(KERN_DEBUG "send_tcn_bpdu: no skb available\n");
|
| 949 |
|
|
return(-1);
|
| 950 |
|
|
}
|
| 951 |
|
|
skb->dev = dev;
|
| 952 |
|
|
skb->free = 1;
|
| 953 |
|
|
skb->h.eth = (struct ethhdr *)skb_put(skb,size);
|
| 954 |
|
|
memcpy(skb->h.eth->h_dest, bridge_ula, ETH_ALEN);
|
| 955 |
|
|
memcpy(skb->h.eth->h_source, dev->dev_addr, ETH_ALEN);
|
| 956 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 957 |
|
|
printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
|
| 958 |
|
|
dest %02x:%02x:%02x:%02x:%02x:%02x\n",
|
| 959 |
|
|
port_no,
|
| 960 |
|
|
skb->h.eth->h_source[0],
|
| 961 |
|
|
skb->h.eth->h_source[1],
|
| 962 |
|
|
skb->h.eth->h_source[2],
|
| 963 |
|
|
skb->h.eth->h_source[3],
|
| 964 |
|
|
skb->h.eth->h_source[4],
|
| 965 |
|
|
skb->h.eth->h_source[5],
|
| 966 |
|
|
skb->h.eth->h_dest[0],
|
| 967 |
|
|
skb->h.eth->h_dest[1],
|
| 968 |
|
|
skb->h.eth->h_dest[2],
|
| 969 |
|
|
skb->h.eth->h_dest[3],
|
| 970 |
|
|
skb->h.eth->h_dest[4],
|
| 971 |
|
|
skb->h.eth->h_dest[5]);
|
| 972 |
|
|
skb->h.eth->h_proto = 0x8038; /* XXX verify */
|
| 973 |
|
|
|
| 974 |
|
|
skb->h.raw += skb->dev->hard_header_len;
|
| 975 |
|
|
memcpy(skb->h.raw, bpdu, sizeof(Tcn_bpdu));
|
| 976 |
|
|
|
| 977 |
|
|
/* mark that's we've been here... */
|
| 978 |
|
|
skb->pkt_bridged = IS_BRIDGED;
|
| 979 |
|
|
skb->arp = 1; /* do not resolve... */
|
| 980 |
|
|
skb->h.raw = skb->data + ETH_HLEN;
|
| 981 |
|
|
|
| 982 |
|
|
dev_queue_xmit(skb, dev, SOPRI_INTERACTIVE);
|
| 983 |
|
|
return(0);
|
| 984 |
|
|
}
|
| 985 |
|
|
|
| 986 |
|
|
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
|
| 987 |
|
|
{
|
| 988 |
|
|
struct device *dev = ptr;
|
| 989 |
|
|
int i;
|
| 990 |
|
|
|
| 991 |
|
|
/* check for loopback devices */
|
| 992 |
|
|
if (dev->flags & IFF_LOOPBACK)
|
| 993 |
|
|
return(NOTIFY_DONE);
|
| 994 |
|
|
|
| 995 |
|
|
switch (event) {
|
| 996 |
|
|
case NETDEV_DOWN:
|
| 997 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 998 |
|
|
printk("br_device_event: NETDEV_DOWN...\n");
|
| 999 |
|
|
/* find our device and mark it down */
|
| 1000 |
|
|
for (i = One; i <= No_of_ports; i++) {
|
| 1001 |
|
|
if (port_info[i].dev == dev) {
|
| 1002 |
|
|
disable_port(i);
|
| 1003 |
|
|
return NOTIFY_DONE;
|
| 1004 |
|
|
break;
|
| 1005 |
|
|
}
|
| 1006 |
|
|
}
|
| 1007 |
|
|
break;
|
| 1008 |
|
|
case NETDEV_UP:
|
| 1009 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 1010 |
|
|
printk("br_device_event: NETDEV_UP...\n");
|
| 1011 |
|
|
/* Only handle ethernet ports */
|
| 1012 |
|
|
if(dev->type!=ARPHRD_ETHER && dev->type!=ARPHRD_LOOPBACK)
|
| 1013 |
|
|
return NOTIFY_DONE;
|
| 1014 |
|
|
/* look up an unused device and enable it */
|
| 1015 |
|
|
for (i = One; i <= No_of_ports; i++) {
|
| 1016 |
|
|
if ((port_info[i].dev == (struct device *)0) ||
|
| 1017 |
|
|
(port_info[i].dev == dev)) {
|
| 1018 |
|
|
port_info[i].dev = dev;
|
| 1019 |
|
|
enable_port(i);
|
| 1020 |
|
|
set_path_cost(i, br_port_cost(dev));
|
| 1021 |
|
|
set_port_priority(i, 128);
|
| 1022 |
|
|
port_info[i].port_id = i;
|
| 1023 |
|
|
/* set bridge addr from 1st device addr */
|
| 1024 |
|
|
if ((bridge_info.bridge_id.BRIDGE_ID[0] == 0) &&
|
| 1025 |
|
|
(bridge_info.bridge_id.BRIDGE_ID[1] == 0)) {
|
| 1026 |
|
|
memcpy(bridge_info.bridge_id.BRIDGE_ID_ULA, dev->dev_addr, 6);
|
| 1027 |
|
|
bridge_info.bridge_id.BRIDGE_PRIORITY = port_info[i].port_id;
|
| 1028 |
|
|
set_bridge_priority(&bridge_info.bridge_id);
|
| 1029 |
|
|
}
|
| 1030 |
|
|
make_forwarding(i);
|
| 1031 |
|
|
return NOTIFY_DONE;
|
| 1032 |
|
|
break;
|
| 1033 |
|
|
}
|
| 1034 |
|
|
}
|
| 1035 |
|
|
break;
|
| 1036 |
|
|
#if 0
|
| 1037 |
|
|
default:
|
| 1038 |
|
|
printk("br_device_event: unknown event [%x]\n",
|
| 1039 |
|
|
(unsigned int)event);
|
| 1040 |
|
|
#endif
|
| 1041 |
|
|
}
|
| 1042 |
|
|
return NOTIFY_DONE;
|
| 1043 |
|
|
}
|
| 1044 |
|
|
|
| 1045 |
|
|
/*
|
| 1046 |
|
|
* following routine is called when a frame is received
|
| 1047 |
|
|
* from an interface, it returns 1 when it consumes the
|
| 1048 |
|
|
* frame, 0 when it does not
|
| 1049 |
|
|
*/
|
| 1050 |
|
|
|
| 1051 |
|
|
int br_receive_frame(struct sk_buff *skb) /* 3.5 */
|
| 1052 |
|
|
{
|
| 1053 |
|
|
int port;
|
| 1054 |
|
|
|
| 1055 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 1056 |
|
|
printk("br_receive_frame: ");
|
| 1057 |
|
|
/* sanity */
|
| 1058 |
|
|
if (!skb) {
|
| 1059 |
|
|
printk(KERN_CRIT "br_receive_frame: no skb!\n");
|
| 1060 |
|
|
return(1);
|
| 1061 |
|
|
}
|
| 1062 |
|
|
|
| 1063 |
|
|
skb->pkt_bridged = IS_BRIDGED;
|
| 1064 |
|
|
|
| 1065 |
|
|
/* check for loopback */
|
| 1066 |
|
|
if (skb->dev->flags & IFF_LOOPBACK)
|
| 1067 |
|
|
return(0);
|
| 1068 |
|
|
|
| 1069 |
|
|
port = find_port(skb->dev);
|
| 1070 |
|
|
|
| 1071 |
|
|
skb->arp = 1; /* Received frame so it is resolved */
|
| 1072 |
|
|
skb->h.raw = skb->mac.raw;
|
| 1073 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 1074 |
|
|
printk("port %i src %02x:%02x:%02x:%02x:%02x:%02x\
|
| 1075 |
|
|
dest %02x:%02x:%02x:%02x:%02x:%02x\n",
|
| 1076 |
|
|
port,
|
| 1077 |
|
|
skb->h.eth->h_source[0],
|
| 1078 |
|
|
skb->h.eth->h_source[1],
|
| 1079 |
|
|
skb->h.eth->h_source[2],
|
| 1080 |
|
|
skb->h.eth->h_source[3],
|
| 1081 |
|
|
skb->h.eth->h_source[4],
|
| 1082 |
|
|
skb->h.eth->h_source[5],
|
| 1083 |
|
|
skb->h.eth->h_dest[0],
|
| 1084 |
|
|
skb->h.eth->h_dest[1],
|
| 1085 |
|
|
skb->h.eth->h_dest[2],
|
| 1086 |
|
|
skb->h.eth->h_dest[3],
|
| 1087 |
|
|
skb->h.eth->h_dest[4],
|
| 1088 |
|
|
skb->h.eth->h_dest[5]);
|
| 1089 |
|
|
|
| 1090 |
|
|
if (!port) {
|
| 1091 |
|
|
if(br_stats.flags&BR_DEBUG)
|
| 1092 |
|
|
printk("\nbr_receive_frame: no port!\n");
|
| 1093 |
|
|
return(0);
|
| 1094 |
|
|
}
|
| 1095 |
|
|
|
| 1096 |
|
|
switch (port_info[port].state)
|
| 1097 |
|
|
{
|
| 1098 |
|
|
case Learning:
|
| 1099 |
|
|
(void) br_learn(skb, port); /* 3.8 */
|
| 1100 |
|
|
/* fall through */
|
| 1101 |
|
|
case Listening:
|
| 1102 |
|
|
/* process BPDUs */
|
| 1103 |
|
|
if (memcmp(skb->h.eth->h_dest, bridge_ula, 6) == 0) {
|
| 1104 |
|
|
br_bpdu(skb);
|
| 1105 |
|
|
return(1); /* br_bpdu consumes skb */
|
| 1106 |
|
|
}
|
| 1107 |
|
|
/* fall through */
|
| 1108 |
|
|
case Blocking:
|
| 1109 |
|
|
/* fall through */
|
| 1110 |
|
|
case Disabled:
|
| 1111 |
|
|
/* should drop frames, but for now, we let
|
| 1112 |
|
|
* them get passed up to the next higher layer
|
| 1113 |
|
|
return(br_drop(skb));
|
| 1114 |
|
|
*/
|
| 1115 |
|
|
return(0); /* pass frame up stack */
|
| 1116 |
|
|
break;
|
| 1117 |
|
|
case Forwarding:
|
| 1118 |
|
|
(void) br_learn(skb, port); /* 3.8 */
|
| 1119 |
|
|
/* process BPDUs */
|
| 1120 |
|
|
if (memcmp(skb->h.eth->h_dest, bridge_ula,
|
| 1121 |
|
|
ETH_ALEN) == 0)
|
| 1122 |
|
|
{
|
| 1123 |
|
|
/*printk("frame bpdu processor for me!!!\n");*/
|
| 1124 |
|
|
br_bpdu(skb);
|
| 1125 |
|
|
return(1); /* br_bpdu consumes skb */
|
| 1126 |
|
|
}
|
| 1127 |
|
|
/* is frame for me? */
|
| 1128 |
|
|
if (memcmp(skb->h.eth->h_dest,
|
| 1129 |
|
|
port_info[port].dev->dev_addr,
|
| 1130 |
|
|
ETH_ALEN) == 0)
|
| 1131 |
|
|
{
|
| 1132 |
|
|
/* Packet is for us */
|
| 1133 |
|
|
skb->pkt_type = PACKET_HOST;
|
| 1134 |
|
|
return(0); /* pass frame up our stack (this will */
|
| 1135 |
|
|
/* happen in net_bh() in dev.c) */
|
| 1136 |
|
|
}
|
| 1137 |
|
|
/* ok, forward this frame... */
|
| 1138 |
|
|
return(br_forward(skb, port));
|
| 1139 |
|
|
default:
|
| 1140 |
|
|
printk(KERN_DEBUG "br_receive_frame: port [%i] unknown state [%i]\n",
|
| 1141 |
|
|
port, port_info[port].state);
|
| 1142 |
|
|
return(0); /* pass frame up stack? */
|
| 1143 |
|
|
}
|
| 1144 |
|
|
}
|
| 1145 |
|
|
|
| 1146 |
|
|
/*
|
| 1147 |
|
|
* the following routine is called to transmit frames from the host
|
| 1148 |
|
|
* stack. it returns 1 when it consumes the frame and
|
| 1149 |
|
|
* 0 when it does not.
|
| 1150 |
|
|
*/
|
| 1151 |
|
|
|
| 1152 |
|
|
int br_tx_frame(struct sk_buff *skb) /* 3.5 */
|
| 1153 |
|
|
{
|
| 1154 |
|
|
int port;
|
| 1155 |
|
|
|
| 1156 |
|
|
/* sanity */
|
| 1157 |
|
|
if (!skb)
|
| 1158 |
|
|
{
|
| 1159 |
|
|
printk(KERN_CRIT "br_tx_frame: no skb!\n");
|
| 1160 |
|
|
return(0);
|
| 1161 |
|
|
}
|
| 1162 |
|
|
|
| 1163 |
|
|
if (!skb->dev)
|
| 1164 |
|
|
{
|
| 1165 |
|
|
printk(KERN_CRIT "br_tx_frame: no dev!\n");
|
| 1166 |
|
|
return(0);
|
| 1167 |
|
|
}
|
| 1168 |
|
|
|
| 1169 |
|
|
/* check for loopback */
|
| 1170 |
|
|
if (skb->dev->flags & IFF_LOOPBACK)
|
| 1171 |
|
|
return(0);
|
| 1172 |
|
|
|
| 1173 |
|
|
skb->h.raw = skb->data;
|
| 1174 |
|
|
port = 0; /* an impossible port */
|
| 1175 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 1176 |
|
|
printk("br_tx_fr : port %i src %02x:%02x:%02x:%02x:%02x:%02x\
|
| 1177 |
|
|
dest %02x:%02x:%02x:%02x:%02x:%02x\n",
|
| 1178 |
|
|
port,
|
| 1179 |
|
|
skb->h.eth->h_source[0],
|
| 1180 |
|
|
skb->h.eth->h_source[1],
|
| 1181 |
|
|
skb->h.eth->h_source[2],
|
| 1182 |
|
|
skb->h.eth->h_source[3],
|
| 1183 |
|
|
skb->h.eth->h_source[4],
|
| 1184 |
|
|
skb->h.eth->h_source[5],
|
| 1185 |
|
|
skb->h.eth->h_dest[0],
|
| 1186 |
|
|
skb->h.eth->h_dest[1],
|
| 1187 |
|
|
skb->h.eth->h_dest[2],
|
| 1188 |
|
|
skb->h.eth->h_dest[3],
|
| 1189 |
|
|
skb->h.eth->h_dest[4],
|
| 1190 |
|
|
skb->h.eth->h_dest[5]);
|
| 1191 |
|
|
return(br_forward(skb, port));
|
| 1192 |
|
|
}
|
| 1193 |
|
|
|
| 1194 |
|
|
/*
|
| 1195 |
|
|
* this routine returns 0 when it learns (or updates) from the
|
| 1196 |
|
|
* frame, and -1 if the frame is simply discarded due to port
|
| 1197 |
|
|
* state or lack of resources...
|
| 1198 |
|
|
*/
|
| 1199 |
|
|
|
| 1200 |
|
|
int br_learn(struct sk_buff *skb, int port) /* 3.8 */
|
| 1201 |
|
|
{
|
| 1202 |
|
|
struct fdb *f;
|
| 1203 |
|
|
|
| 1204 |
|
|
switch (port_info[port].state) {
|
| 1205 |
|
|
case Listening:
|
| 1206 |
|
|
case Blocking:
|
| 1207 |
|
|
case Disabled:
|
| 1208 |
|
|
default:
|
| 1209 |
|
|
return(-1);
|
| 1210 |
|
|
/* break; */
|
| 1211 |
|
|
case Learning:
|
| 1212 |
|
|
case Forwarding:
|
| 1213 |
|
|
/* don't keep group addresses in the tree */
|
| 1214 |
|
|
if (skb->h.eth->h_source[0] & 0x01)
|
| 1215 |
|
|
return(-1);
|
| 1216 |
|
|
|
| 1217 |
|
|
f = (struct fdb *)kmalloc(sizeof(struct fdb),
|
| 1218 |
|
|
GFP_ATOMIC);
|
| 1219 |
|
|
|
| 1220 |
|
|
if (!f) {
|
| 1221 |
|
|
printk(KERN_DEBUG "br_learn: unable to malloc fdb\n");
|
| 1222 |
|
|
return(-1);
|
| 1223 |
|
|
}
|
| 1224 |
|
|
f->port = port; /* source port */
|
| 1225 |
|
|
memcpy(f->ula, skb->h.eth->h_source, 6);
|
| 1226 |
|
|
f->timer = CURRENT_TIME;
|
| 1227 |
|
|
f->flags = FDB_ENT_VALID;
|
| 1228 |
|
|
/*
|
| 1229 |
|
|
* add entity to AVL tree. If entity already
|
| 1230 |
|
|
* exists in the tree, update the fields with
|
| 1231 |
|
|
* what we have here.
|
| 1232 |
|
|
*/
|
| 1233 |
|
|
if (br_avl_insert(f) == 0) { /* update */
|
| 1234 |
|
|
kfree(f);
|
| 1235 |
|
|
return(0);
|
| 1236 |
|
|
}
|
| 1237 |
|
|
/* add to head of port chain */
|
| 1238 |
|
|
f->fdb_next = port_info[port].fdb;
|
| 1239 |
|
|
port_info[port].fdb = f;
|
| 1240 |
|
|
return(0);
|
| 1241 |
|
|
/* break */
|
| 1242 |
|
|
}
|
| 1243 |
|
|
}
|
| 1244 |
|
|
|
| 1245 |
|
|
/*
|
| 1246 |
|
|
* this routine always consumes the frame
|
| 1247 |
|
|
*/
|
| 1248 |
|
|
|
| 1249 |
|
|
int br_drop(struct sk_buff *skb)
|
| 1250 |
|
|
{
|
| 1251 |
|
|
kfree_skb(skb, 0);
|
| 1252 |
|
|
return(1);
|
| 1253 |
|
|
}
|
| 1254 |
|
|
|
| 1255 |
|
|
/*
|
| 1256 |
|
|
* this routine always consumes the frame
|
| 1257 |
|
|
*/
|
| 1258 |
|
|
|
| 1259 |
|
|
int br_dev_drop(struct sk_buff *skb)
|
| 1260 |
|
|
{
|
| 1261 |
|
|
dev_kfree_skb(skb, 0);
|
| 1262 |
|
|
return(1);
|
| 1263 |
|
|
}
|
| 1264 |
|
|
|
| 1265 |
|
|
/*
|
| 1266 |
|
|
* this routine returns 1 if it consumes the frame, 0
|
| 1267 |
|
|
* if not...
|
| 1268 |
|
|
*/
|
| 1269 |
|
|
|
| 1270 |
|
|
int br_forward(struct sk_buff *skb, int port) /* 3.7 */
|
| 1271 |
|
|
{
|
| 1272 |
|
|
struct fdb *f;
|
| 1273 |
|
|
|
| 1274 |
|
|
/*
|
| 1275 |
|
|
* flood all ports with frames destined for a group
|
| 1276 |
|
|
* address. If frame came from above, drop it,
|
| 1277 |
|
|
* otherwise it will be handled in br_receive_frame()
|
| 1278 |
|
|
* Multicast frames will also need to be seen
|
| 1279 |
|
|
* by our upper layers.
|
| 1280 |
|
|
*/
|
| 1281 |
|
|
if (skb->h.eth->h_dest[0] & 0x01)
|
| 1282 |
|
|
{
|
| 1283 |
|
|
/* group address */
|
| 1284 |
|
|
br_flood(skb, port);
|
| 1285 |
|
|
/*
|
| 1286 |
|
|
* External groups are fed out via the normal source
|
| 1287 |
|
|
* This probably should be dropped since the flood will
|
| 1288 |
|
|
* have sent it anyway.
|
| 1289 |
|
|
*/
|
| 1290 |
|
|
if (port == 0) /* locally generated */
|
| 1291 |
|
|
return(br_dev_drop(skb));
|
| 1292 |
|
|
return(0);
|
| 1293 |
|
|
} else {
|
| 1294 |
|
|
/* locate port to forward to */
|
| 1295 |
|
|
f = br_avl_find_addr(skb->h.eth->h_dest);
|
| 1296 |
|
|
/*
|
| 1297 |
|
|
* Send flood and drop.
|
| 1298 |
|
|
*/
|
| 1299 |
|
|
if (!f || !(f->flags & FDB_ENT_VALID)) {
|
| 1300 |
|
|
/* not found; flood all ports */
|
| 1301 |
|
|
br_flood(skb, port);
|
| 1302 |
|
|
return(br_dev_drop(skb));
|
| 1303 |
|
|
}
|
| 1304 |
|
|
/*
|
| 1305 |
|
|
* Sending
|
| 1306 |
|
|
*/
|
| 1307 |
|
|
|
| 1308 |
|
|
/*
|
| 1309 |
|
|
* Vova Oksman: There was the BUG, we must to check timer
|
| 1310 |
|
|
* before comparing source and destination ports, becouse
|
| 1311 |
|
|
* case that destination was switched from same port with
|
| 1312 |
|
|
* source to other port.
|
| 1313 |
|
|
*/
|
| 1314 |
|
|
/* has entry expired? */
|
| 1315 |
|
|
if (port_info[f->port].state == Forwarding &&
|
| 1316 |
|
|
f->timer + fdb_aging_time < CURRENT_TIME) {
|
| 1317 |
|
|
/* timer expired, invalidate entry */
|
| 1318 |
|
|
f->flags &= ~FDB_ENT_VALID;
|
| 1319 |
|
|
if (br_stats.flags & BR_DEBUG)
|
| 1320 |
|
|
printk("fdb entry expired...\n");
|
| 1321 |
|
|
/*
|
| 1322 |
|
|
* Send flood and drop original
|
| 1323 |
|
|
*/
|
| 1324 |
|
|
br_flood(skb, port);
|
| 1325 |
|
|
return(br_dev_drop(skb));
|
| 1326 |
|
|
}
|
| 1327 |
|
|
if (f->port!=port && port_info[f->port].state == Forwarding) {
|
| 1328 |
|
|
/* mark that's we've been here... */
|
| 1329 |
|
|
skb->pkt_bridged = IS_BRIDGED;
|
| 1330 |
|
|
|
| 1331 |
|
|
/* reset the skb->ip pointer */
|
| 1332 |
|
|
skb->h.raw = skb->data + ETH_HLEN;
|
| 1333 |
|
|
|
| 1334 |
|
|
/*
|
| 1335 |
|
|
* Send the buffer out.
|
| 1336 |
|
|
*/
|
| 1337 |
|
|
|
| 1338 |
|
|
skb->dev=port_info[f->port].dev;
|
| 1339 |
|
|
|
| 1340 |
|
|
/*
|
| 1341 |
|
|
* We send this still locked
|
| 1342 |
|
|
*/
|
| 1343 |
|
|
dev_queue_xmit(skb, skb->dev,1);
|
| 1344 |
|
|
return(1); /* skb has been consumed */
|
| 1345 |
|
|
} else {
|
| 1346 |
|
|
/*
|
| 1347 |
|
|
* Arrived on the right port, we discard
|
| 1348 |
|
|
*/
|
| 1349 |
|
|
return(br_dev_drop(skb));
|
| 1350 |
|
|
}
|
| 1351 |
|
|
}
|
| 1352 |
|
|
}
|
| 1353 |
|
|
|
| 1354 |
|
|
/*
|
| 1355 |
|
|
* this routine sends a copy of the frame to all forwarding ports
|
| 1356 |
|
|
* with the exception of the port given. This routine never
|
| 1357 |
|
|
* consumes the original frame.
|
| 1358 |
|
|
*/
|
| 1359 |
|
|
|
| 1360 |
|
|
int br_flood(struct sk_buff *skb, int port)
|
| 1361 |
|
|
{
|
| 1362 |
|
|
int i;
|
| 1363 |
|
|
struct sk_buff *nskb;
|
| 1364 |
|
|
|
| 1365 |
|
|
for (i = One; i <= No_of_ports; i++)
|
| 1366 |
|
|
{
|
| 1367 |
|
|
if (i == port)
|
| 1368 |
|
|
continue;
|
| 1369 |
|
|
if (port_info[i].state == Forwarding)
|
| 1370 |
|
|
{
|
| 1371 |
|
|
nskb = skb_clone(skb, GFP_ATOMIC);
|
| 1372 |
|
|
if(nskb==NULL)
|
| 1373 |
|
|
continue;
|
| 1374 |
|
|
/* mark that's we've been here... */
|
| 1375 |
|
|
nskb->pkt_bridged = IS_BRIDGED;
|
| 1376 |
|
|
/* Send to each port in turn */
|
| 1377 |
|
|
nskb->dev= port_info[i].dev;
|
| 1378 |
|
|
/* To get here we must have done ARP already,
|
| 1379 |
|
|
or have a received valid MAC header */
|
| 1380 |
|
|
nskb->arp = 1;
|
| 1381 |
|
|
|
| 1382 |
|
|
/* printk("Flood to port %d\n",i);*/
|
| 1383 |
|
|
nskb->h.raw = nskb->data + ETH_HLEN;
|
| 1384 |
|
|
dev_queue_xmit(nskb,nskb->dev,1);
|
| 1385 |
|
|
}
|
| 1386 |
|
|
}
|
| 1387 |
|
|
return(0);
|
| 1388 |
|
|
}
|
| 1389 |
|
|
|
| 1390 |
|
|
int find_port(struct device *dev)
|
| 1391 |
|
|
{
|
| 1392 |
|
|
int i;
|
| 1393 |
|
|
|
| 1394 |
|
|
for (i = One; i <= No_of_ports; i++)
|
| 1395 |
|
|
if ((port_info[i].dev == dev) &&
|
| 1396 |
|
|
(port_info[i].state != Disabled))
|
| 1397 |
|
|
return(i);
|
| 1398 |
|
|
return(0);
|
| 1399 |
|
|
}
|
| 1400 |
|
|
|
| 1401 |
|
|
int br_port_cost(struct device *dev) /* 4.10.2 */
|
| 1402 |
|
|
{
|
| 1403 |
|
|
if (strncmp(dev->name, "eth", 3) == 0) /* ethernet */
|
| 1404 |
|
|
return(100);
|
| 1405 |
|
|
if (strncmp(dev->name, "wic", 3) == 0) /* wic */
|
| 1406 |
|
|
return(1600);
|
| 1407 |
|
|
if (strncmp(dev->name, "plip",4) == 0) /* plip */
|
| 1408 |
|
|
return (1600);
|
| 1409 |
|
|
return(100); /* default */
|
| 1410 |
|
|
}
|
| 1411 |
|
|
|
| 1412 |
|
|
/*
|
| 1413 |
|
|
* this routine always consumes the skb
|
| 1414 |
|
|
*/
|
| 1415 |
|
|
|
| 1416 |
|
|
void br_bpdu(struct sk_buff *skb) /* consumes skb */
|
| 1417 |
|
|
{
|
| 1418 |
|
|
Tcn_bpdu *bpdu;
|
| 1419 |
|
|
int port;
|
| 1420 |
|
|
|
| 1421 |
|
|
port = find_port(skb->dev);
|
| 1422 |
|
|
if (port == 0) { /* unknown port */
|
| 1423 |
|
|
br_drop(skb);
|
| 1424 |
|
|
return;
|
| 1425 |
|
|
}
|
| 1426 |
|
|
|
| 1427 |
|
|
bpdu = (Tcn_bpdu *) (skb->data + ETH_HLEN);
|
| 1428 |
|
|
switch (bpdu->type) {
|
| 1429 |
|
|
case BPDU_TYPE_CONFIG:
|
| 1430 |
|
|
received_config_bpdu(port, (Config_bpdu *)bpdu);
|
| 1431 |
|
|
break;
|
| 1432 |
|
|
case BPDU_TYPE_TOPO_CHANGE:
|
| 1433 |
|
|
received_tcn_bpdu(port, bpdu);
|
| 1434 |
|
|
break;
|
| 1435 |
|
|
default:
|
| 1436 |
|
|
printk(KERN_DEBUG "br_bpdu: received unknown bpdu, type = %i\n",
|
| 1437 |
|
|
bpdu->type);
|
| 1438 |
|
|
/* break; */
|
| 1439 |
|
|
}
|
| 1440 |
|
|
br_drop(skb);
|
| 1441 |
|
|
}
|
| 1442 |
|
|
|
| 1443 |
|
|
int br_ioctl(unsigned int cmd, void *arg)
|
| 1444 |
|
|
{
|
| 1445 |
|
|
int err;
|
| 1446 |
|
|
struct br_cf bcf;
|
| 1447 |
|
|
|
| 1448 |
|
|
switch(cmd)
|
| 1449 |
|
|
{
|
| 1450 |
|
|
case SIOCGIFBR: /* get bridging control blocks */
|
| 1451 |
|
|
err = verify_area(VERIFY_WRITE, arg,
|
| 1452 |
|
|
sizeof(struct br_stat));
|
| 1453 |
|
|
if(err)
|
| 1454 |
|
|
return err;
|
| 1455 |
|
|
memcpy(&br_stats.bridge_data, &bridge_info, sizeof(Bridge_data));
|
| 1456 |
|
|
memcpy(&br_stats.port_data, &port_info, sizeof(Port_data)*No_of_ports);
|
| 1457 |
|
|
memcpy_tofs(arg, &br_stats, sizeof(struct br_stat));
|
| 1458 |
|
|
return(0);
|
| 1459 |
|
|
case SIOCSIFBR:
|
| 1460 |
|
|
if (!suser())
|
| 1461 |
|
|
return -EPERM;
|
| 1462 |
|
|
err = verify_area(VERIFY_READ, arg,
|
| 1463 |
|
|
sizeof(struct br_cf));
|
| 1464 |
|
|
if(err)
|
| 1465 |
|
|
return err;
|
| 1466 |
|
|
memcpy_fromfs(&bcf, arg, sizeof(struct br_cf));
|
| 1467 |
|
|
switch (bcf.cmd) {
|
| 1468 |
|
|
case BRCMD_BRIDGE_ENABLE:
|
| 1469 |
|
|
if (br_stats.flags & BR_UP)
|
| 1470 |
|
|
return(-EALREADY);
|
| 1471 |
|
|
printk(KERN_DEBUG "br: enabling bridging function\n");
|
| 1472 |
|
|
br_stats.flags |= BR_UP; /* enable bridge */
|
| 1473 |
|
|
start_hello_timer();
|
| 1474 |
|
|
break;
|
| 1475 |
|
|
case BRCMD_BRIDGE_DISABLE:
|
| 1476 |
|
|
if (!(br_stats.flags & BR_UP))
|
| 1477 |
|
|
return(-EALREADY);
|
| 1478 |
|
|
printk(KERN_DEBUG "br: disabling bridging function\n");
|
| 1479 |
|
|
br_stats.flags &= ~BR_UP; /* disable bridge */
|
| 1480 |
|
|
stop_hello_timer();
|
| 1481 |
|
|
#if 0
|
| 1482 |
|
|
for (i = One; i <= No_of_ports; i++)
|
| 1483 |
|
|
if (port_info[i].state != Disabled)
|
| 1484 |
|
|
disable_port(i);
|
| 1485 |
|
|
#endif
|
| 1486 |
|
|
break;
|
| 1487 |
|
|
case BRCMD_PORT_ENABLE:
|
| 1488 |
|
|
if (port_info[bcf.arg1].dev == 0)
|
| 1489 |
|
|
return(-EINVAL);
|
| 1490 |
|
|
if (port_info[bcf.arg1].state != Disabled)
|
| 1491 |
|
|
return(-EALREADY);
|
| 1492 |
|
|
printk(KERN_DEBUG "br: enabling port %i\n",bcf.arg1);
|
| 1493 |
|
|
enable_port(bcf.arg1);
|
| 1494 |
|
|
break;
|
| 1495 |
|
|
case BRCMD_PORT_DISABLE:
|
| 1496 |
|
|
if (port_info[bcf.arg1].dev == 0)
|
| 1497 |
|
|
return(-EINVAL);
|
| 1498 |
|
|
if (port_info[bcf.arg1].state == Disabled)
|
| 1499 |
|
|
return(-EALREADY);
|
| 1500 |
|
|
printk(KERN_DEBUG "br: disabling port %i\n",bcf.arg1);
|
| 1501 |
|
|
disable_port(bcf.arg1);
|
| 1502 |
|
|
break;
|
| 1503 |
|
|
case BRCMD_SET_BRIDGE_PRIORITY:
|
| 1504 |
|
|
set_bridge_priority((bridge_id_t *)&bcf.arg1);
|
| 1505 |
|
|
break;
|
| 1506 |
|
|
case BRCMD_SET_PORT_PRIORITY:
|
| 1507 |
|
|
if (port_info[bcf.arg1].dev == 0)
|
| 1508 |
|
|
return(-EINVAL);
|
| 1509 |
|
|
set_port_priority(bcf.arg1, bcf.arg2);
|
| 1510 |
|
|
break;
|
| 1511 |
|
|
case BRCMD_SET_PATH_COST:
|
| 1512 |
|
|
if (port_info[bcf.arg1].dev == 0)
|
| 1513 |
|
|
return(-EINVAL);
|
| 1514 |
|
|
set_path_cost(bcf.arg1, bcf.arg2);
|
| 1515 |
|
|
break;
|
| 1516 |
|
|
case BRCMD_ENABLE_DEBUG:
|
| 1517 |
|
|
br_stats.flags |= BR_DEBUG;
|
| 1518 |
|
|
break;
|
| 1519 |
|
|
case BRCMD_DISABLE_DEBUG:
|
| 1520 |
|
|
br_stats.flags &= ~BR_DEBUG;
|
| 1521 |
|
|
break;
|
| 1522 |
|
|
default:
|
| 1523 |
|
|
return -EINVAL;
|
| 1524 |
|
|
}
|
| 1525 |
|
|
return(0);
|
| 1526 |
|
|
default:
|
| 1527 |
|
|
return -EINVAL;
|
| 1528 |
|
|
}
|
| 1529 |
|
|
/*NOTREACHED*/
|
| 1530 |
|
|
return 0;
|
| 1531 |
|
|
}
|
| 1532 |
|
|
|
| 1533 |
|
|
int br_cmp(unsigned int *a, unsigned int *b)
|
| 1534 |
|
|
{
|
| 1535 |
|
|
int i;
|
| 1536 |
|
|
for (i=0; i<2; i++)
|
| 1537 |
|
|
{
|
| 1538 |
|
|
if (a[i] == b[i])
|
| 1539 |
|
|
continue;
|
| 1540 |
|
|
if (a[i] < b[i])
|
| 1541 |
|
|
return(1);
|
| 1542 |
|
|
if (a[i] > b[i])
|
| 1543 |
|
|
return(-1);
|
| 1544 |
|
|
}
|
| 1545 |
|
|
return(0);
|
| 1546 |
|
|
}
|
| 1547 |
|
|
|
