3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/if_arp.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/rtnetlink.h>
25 #include "br_private.h"
28 * Determine initial path cost based on speed.
29 * using recommendations from 802.1d standard
31 * Need to simulate user ioctl because not all device's that support
32 * ethtool, use ethtool_ops. Also, since driver might sleep need to
33 * not be holding any locks.
35 static int br_initial_port_cost(struct net_device *dev)
38 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
43 strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
44 ifr.ifr_data = (void *) &ecmd;
48 err = dev_ethtool(&ifr);
62 pr_info("bridge: can't decode speed from %s: %d\n",
63 dev->name, ecmd.speed);
68 /* Old silly heuristics based on name */
69 if (!strncmp(dev->name, "lec", 3))
72 if (!strncmp(dev->name, "plip", 4))
75 return 100; /* assume old 10Mbps */
78 static void destroy_nbp(void *arg)
80 struct net_bridge_port *p = arg;
82 p->dev->br_port = NULL;
84 BUG_ON(timer_pending(&p->message_age_timer));
85 BUG_ON(timer_pending(&p->forward_delay_timer));
86 BUG_ON(timer_pending(&p->hold_timer));
92 /* called under bridge lock */
93 static void del_nbp(struct net_bridge_port *p)
95 struct net_device *dev = p->dev;
97 br_stp_disable_port(p);
99 dev_set_promiscuity(dev, -1);
101 list_del_rcu(&p->list);
103 br_fdb_delete_by_port(p->br, p);
105 del_timer(&p->message_age_timer);
106 del_timer(&p->forward_delay_timer);
107 del_timer(&p->hold_timer);
109 call_rcu(&p->rcu, destroy_nbp, p);
112 static void del_br(struct net_bridge *br)
114 struct list_head *p, *n;
116 spin_lock_bh(&br->lock);
117 list_for_each_safe(p, n, &br->port_list) {
118 del_nbp(list_entry(p, struct net_bridge_port, list));
120 spin_unlock_bh(&br->lock);
122 del_timer_sync(&br->gc_timer);
124 unregister_netdevice(br->dev);
127 static struct net_bridge *new_nb(const char *name)
129 struct net_bridge *br;
130 struct net_device *dev;
132 dev = alloc_netdev(sizeof(struct net_bridge), name,
141 br->lock = SPIN_LOCK_UNLOCKED;
142 INIT_LIST_HEAD(&br->port_list);
143 br->hash_lock = RW_LOCK_UNLOCKED;
145 br->bridge_id.prio[0] = 0x80;
146 br->bridge_id.prio[1] = 0x00;
147 memset(br->bridge_id.addr, 0, ETH_ALEN);
150 br->designated_root = br->bridge_id;
151 br->root_path_cost = 0;
153 br->bridge_max_age = br->max_age = 20 * HZ;
154 br->bridge_hello_time = br->hello_time = 2 * HZ;
155 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
156 br->topology_change = 0;
157 br->topology_change_detected = 0;
158 br->ageing_time = 300 * HZ;
159 INIT_LIST_HEAD(&br->age_list);
161 br_stp_timer_init(br);
166 /* find an available port number */
167 static int find_portno(struct net_bridge *br)
170 struct net_bridge_port *p;
171 unsigned long *inuse;
173 inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
178 memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
179 set_bit(0, inuse); /* zero is reserved */
180 list_for_each_entry(p, &br->port_list, list) {
181 set_bit(p->port_no, inuse);
183 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
186 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
189 /* called under bridge lock */
190 static struct net_bridge_port *new_nbp(struct net_bridge *br,
191 struct net_device *dev,
195 struct net_bridge_port *p;
197 index = find_portno(br);
199 return ERR_PTR(index);
201 p = kmalloc(sizeof(*p), GFP_ATOMIC);
203 return ERR_PTR(-ENOMEM);
205 memset(p, 0, sizeof(*p));
210 p->priority = 0x8000 >> BR_PORT_BITS;
214 p->state = BR_STATE_DISABLED;
219 int br_add_bridge(const char *name)
221 struct net_bridge *br;
224 if ((br = new_nb(name)) == NULL)
227 ret = register_netdev(br->dev);
229 free_netdev(br->dev);
233 int br_del_bridge(const char *name)
235 struct net_device *dev;
239 dev = __dev_get_by_name(name);
241 ret = -ENXIO; /* Could not find device */
243 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
244 /* Attempt to delete non bridge device! */
248 else if (dev->flags & IFF_UP) {
249 /* Not shutdown yet. */
260 int br_add_if(struct net_bridge *br, struct net_device *dev)
262 struct net_bridge_port *p;
266 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
269 if (dev->hard_start_xmit == br_dev_xmit)
272 cost = br_initial_port_cost(dev);
274 spin_lock_bh(&br->lock);
275 if (dev->br_port != NULL)
278 else if (IS_ERR(p = new_nbp(br, dev, cost)))
281 else if ((err = br_fdb_insert(br, p, dev->dev_addr, 1)))
285 dev_set_promiscuity(dev, 1);
287 list_add_rcu(&p->list, &br->port_list);
289 br_stp_recalculate_bridge_id(br);
290 if ((br->dev->flags & IFF_UP) && (dev->flags & IFF_UP))
291 br_stp_enable_port(p);
294 spin_unlock_bh(&br->lock);
298 int br_del_if(struct net_bridge *br, struct net_device *dev)
300 struct net_bridge_port *p;
303 spin_lock_bh(&br->lock);
305 if (!p || p->br != br)
309 br_stp_recalculate_bridge_id(br);
311 spin_unlock_bh(&br->lock);
316 int br_get_bridge_ifindices(int *indices, int num)
318 struct net_device *dev;
321 read_lock(&dev_base_lock);
322 for (dev = dev_base; dev && i < num; dev = dev->next) {
323 if (dev->priv_flags & IFF_EBRIDGE)
324 indices[i++] = dev->ifindex;
326 read_unlock(&dev_base_lock);
331 void br_get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
333 struct net_bridge_port *p;
336 list_for_each_entry_rcu(p, &br->port_list, list) {
337 if (p->port_no < num)
338 ifindices[p->port_no] = p->dev->ifindex;
344 void __exit br_cleanup_bridges(void)
346 struct net_device *dev, *nxt;
349 for (dev = dev_base; dev; dev = nxt) {
351 if (dev->priv_flags & IFF_EBRIDGE)