3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/init.h>
19 #include <linux/llc.h>
22 #include <net/switchdev.h>
24 #include "br_private.h"
27 * Handle changes in state of network devices enslaved to a bridge.
29 * Note: don't care about up/down if bridge itself is down, because
30 * port state is checked when bridge is brought up.
32 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
34 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
35 struct net_bridge_port *p;
36 struct net_bridge *br;
37 bool notified = false;
41 /* register of bridge completed, add sysfs entries */
42 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
47 /* not a port of a bridge */
48 p = br_port_get_rtnl(dev);
55 case NETDEV_CHANGEMTU:
56 br_mtu_auto_adjust(br);
59 case NETDEV_CHANGEADDR:
60 spin_lock_bh(&br->lock);
61 br_fdb_changeaddr(p, dev->dev_addr);
62 changed_addr = br_stp_recalculate_bridge_id(br);
63 spin_unlock_bh(&br->lock);
66 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
71 br_port_carrier_check(p, ¬ified);
74 case NETDEV_FEAT_CHANGE:
75 netdev_update_features(br->dev);
79 spin_lock_bh(&br->lock);
80 if (br->dev->flags & IFF_UP) {
81 br_stp_disable_port(p);
84 spin_unlock_bh(&br->lock);
88 if (netif_running(br->dev) && netif_oper_up(dev)) {
89 spin_lock_bh(&br->lock);
90 br_stp_enable_port(p);
92 spin_unlock_bh(&br->lock);
96 case NETDEV_UNREGISTER:
100 case NETDEV_CHANGENAME:
101 err = br_sysfs_renameif(p);
103 return notifier_from_errno(err);
106 case NETDEV_PRE_TYPE_CHANGE:
107 /* Forbid underlaying device to change its type. */
110 case NETDEV_RESEND_IGMP:
111 /* Propagate to master device */
112 call_netdevice_notifiers(event, br->dev);
116 /* Events that may cause spanning tree to refresh */
117 if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
118 event == NETDEV_CHANGE || event == NETDEV_DOWN))
119 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
124 static struct notifier_block br_device_notifier = {
125 .notifier_call = br_device_event
128 /* called with RTNL or RCU */
129 static int br_switchdev_event(struct notifier_block *unused,
130 unsigned long event, void *ptr)
132 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
133 struct net_bridge_port *p;
134 struct net_bridge *br;
135 struct switchdev_notifier_fdb_info *fdb_info;
136 int err = NOTIFY_DONE;
138 p = br_port_get_rtnl_rcu(dev);
145 case SWITCHDEV_FDB_ADD_TO_BRIDGE:
147 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
148 fdb_info->vid, false);
150 err = notifier_from_errno(err);
153 br_fdb_offloaded_set(br, p, fdb_info->addr,
154 fdb_info->vid, true);
156 case SWITCHDEV_FDB_DEL_TO_BRIDGE:
158 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
159 fdb_info->vid, false);
161 err = notifier_from_errno(err);
163 case SWITCHDEV_FDB_OFFLOADED:
165 br_fdb_offloaded_set(br, p, fdb_info->addr,
166 fdb_info->vid, fdb_info->offloaded);
174 static struct notifier_block br_switchdev_notifier = {
175 .notifier_call = br_switchdev_event,
178 /* br_boolopt_toggle - change user-controlled boolean option
181 * @opt: id of the option to change
182 * @on: new option value
183 * @extack: extack for error messages
185 * Changes the value of the respective boolean option to @on taking care of
186 * any internal option value mapping and configuration.
188 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
189 struct netlink_ext_ack *extack)
192 case BR_BOOLOPT_NO_LL_LEARN:
193 br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
196 /* shouldn't be called with unsupported options */
204 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
207 case BR_BOOLOPT_NO_LL_LEARN:
208 return br_opt_get(br, BROPT_NO_LL_LEARN);
210 /* shouldn't be called with unsupported options */
218 int br_boolopt_multi_toggle(struct net_bridge *br,
219 struct br_boolopt_multi *bm,
220 struct netlink_ext_ack *extack)
222 unsigned long bitmap = bm->optmask;
226 for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
227 bool on = !!(bm->optval & BIT(opt_id));
229 err = br_boolopt_toggle(br, opt_id, on, extack);
231 br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
232 opt_id, br_boolopt_get(br, opt_id), on, err);
240 void br_boolopt_multi_get(const struct net_bridge *br,
241 struct br_boolopt_multi *bm)
246 for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
247 optval |= (br_boolopt_get(br, opt_id) << opt_id);
250 bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
253 /* private bridge options, controlled by the kernel */
254 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
256 bool cur = !!br_opt_get(br, opt);
258 br_debug(br, "toggle option: %d state: %d -> %d\n",
265 set_bit(opt, &br->options);
267 clear_bit(opt, &br->options);
270 static void __net_exit br_net_exit(struct net *net)
272 struct net_device *dev;
276 for_each_netdev(net, dev)
277 if (dev->priv_flags & IFF_EBRIDGE)
278 br_dev_delete(dev, &list);
280 unregister_netdevice_many(&list);
285 static struct pernet_operations br_net_ops = {
289 static const struct stp_proto br_stp_proto = {
293 static int __init br_init(void)
297 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
299 err = stp_proto_register(&br_stp_proto);
301 pr_err("bridge: can't register sap for STP\n");
309 err = register_pernet_subsys(&br_net_ops);
313 err = br_nf_core_init();
317 err = register_netdevice_notifier(&br_device_notifier);
321 err = register_switchdev_notifier(&br_switchdev_notifier);
325 err = br_netlink_init();
329 brioctl_set(br_ioctl_deviceless_stub);
331 #if IS_ENABLED(CONFIG_ATM_LANE)
332 br_fdb_test_addr_hook = br_fdb_test_addr;
335 #if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
336 pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
337 "by default. Update your scripts to load br_netfilter if you "
344 unregister_switchdev_notifier(&br_switchdev_notifier);
346 unregister_netdevice_notifier(&br_device_notifier);
350 unregister_pernet_subsys(&br_net_ops);
354 stp_proto_unregister(&br_stp_proto);
358 static void __exit br_deinit(void)
360 stp_proto_unregister(&br_stp_proto);
362 unregister_switchdev_notifier(&br_switchdev_notifier);
363 unregister_netdevice_notifier(&br_device_notifier);
365 unregister_pernet_subsys(&br_net_ops);
367 rcu_barrier(); /* Wait for completion of call_rcu()'s */
370 #if IS_ENABLED(CONFIG_ATM_LANE)
371 br_fdb_test_addr_hook = NULL;
377 module_exit(br_deinit)
378 MODULE_LICENSE("GPL");
379 MODULE_VERSION(BR_VERSION);
380 MODULE_ALIAS_RTNL_LINK("bridge");