1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux ethernet bridge
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/init.h>
15 #include <linux/llc.h>
18 #include <net/switchdev.h>
20 #include "br_private.h"
23 * Handle changes in state of network devices enslaved to a bridge.
25 * Note: don't care about up/down if bridge itself is down, because
26 * port state is checked when bridge is brought up.
28 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
30 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
31 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
32 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
33 struct net_bridge_port *p;
34 struct net_bridge *br;
35 bool notified = false;
39 if (dev->priv_flags & IFF_EBRIDGE) {
40 err = br_vlan_bridge_event(dev, event, ptr);
42 return notifier_from_errno(err);
44 if (event == NETDEV_REGISTER) {
45 /* register of bridge completed, add sysfs entries */
51 /* not a port of a bridge */
52 p = br_port_get_rtnl(dev);
59 case NETDEV_CHANGEMTU:
60 br_mtu_auto_adjust(br);
63 case NETDEV_PRE_CHANGEADDR:
64 if (br->dev->addr_assign_type == NET_ADDR_SET)
67 err = dev_pre_changeaddr_notify(br->dev,
68 prechaddr_info->dev_addr,
71 return notifier_from_errno(err);
74 case NETDEV_CHANGEADDR:
75 spin_lock_bh(&br->lock);
76 br_fdb_changeaddr(p, dev->dev_addr);
77 changed_addr = br_stp_recalculate_bridge_id(br);
78 spin_unlock_bh(&br->lock);
81 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
86 br_port_carrier_check(p, ¬ified);
89 case NETDEV_FEAT_CHANGE:
90 netdev_update_features(br->dev);
94 spin_lock_bh(&br->lock);
95 if (br->dev->flags & IFF_UP) {
96 br_stp_disable_port(p);
99 spin_unlock_bh(&br->lock);
103 if (netif_running(br->dev) && netif_oper_up(dev)) {
104 spin_lock_bh(&br->lock);
105 br_stp_enable_port(p);
107 spin_unlock_bh(&br->lock);
111 case NETDEV_UNREGISTER:
115 case NETDEV_CHANGENAME:
116 err = br_sysfs_renameif(p);
118 return notifier_from_errno(err);
121 case NETDEV_PRE_TYPE_CHANGE:
122 /* Forbid underlaying device to change its type. */
125 case NETDEV_RESEND_IGMP:
126 /* Propagate to master device */
127 call_netdevice_notifiers(event, br->dev);
131 if (event != NETDEV_UNREGISTER)
132 br_vlan_port_event(p, event);
134 /* Events that may cause spanning tree to refresh */
135 if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
136 event == NETDEV_CHANGE || event == NETDEV_DOWN))
137 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
142 static struct notifier_block br_device_notifier = {
143 .notifier_call = br_device_event
146 /* called with RTNL or RCU */
147 static int br_switchdev_event(struct notifier_block *unused,
148 unsigned long event, void *ptr)
150 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
151 struct net_bridge_port *p;
152 struct net_bridge *br;
153 struct switchdev_notifier_fdb_info *fdb_info;
154 int err = NOTIFY_DONE;
156 p = br_port_get_rtnl_rcu(dev);
163 case SWITCHDEV_FDB_ADD_TO_BRIDGE:
165 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
166 fdb_info->vid, false);
168 err = notifier_from_errno(err);
171 br_fdb_offloaded_set(br, p, fdb_info->addr,
172 fdb_info->vid, true);
174 case SWITCHDEV_FDB_DEL_TO_BRIDGE:
176 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
177 fdb_info->vid, false);
179 err = notifier_from_errno(err);
181 case SWITCHDEV_FDB_OFFLOADED:
183 br_fdb_offloaded_set(br, p, fdb_info->addr,
184 fdb_info->vid, fdb_info->offloaded);
192 static struct notifier_block br_switchdev_notifier = {
193 .notifier_call = br_switchdev_event,
196 /* br_boolopt_toggle - change user-controlled boolean option
199 * @opt: id of the option to change
200 * @on: new option value
201 * @extack: extack for error messages
203 * Changes the value of the respective boolean option to @on taking care of
204 * any internal option value mapping and configuration.
206 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
207 struct netlink_ext_ack *extack)
210 case BR_BOOLOPT_NO_LL_LEARN:
211 br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
214 /* shouldn't be called with unsupported options */
222 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
225 case BR_BOOLOPT_NO_LL_LEARN:
226 return br_opt_get(br, BROPT_NO_LL_LEARN);
228 /* shouldn't be called with unsupported options */
236 int br_boolopt_multi_toggle(struct net_bridge *br,
237 struct br_boolopt_multi *bm,
238 struct netlink_ext_ack *extack)
240 unsigned long bitmap = bm->optmask;
244 for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
245 bool on = !!(bm->optval & BIT(opt_id));
247 err = br_boolopt_toggle(br, opt_id, on, extack);
249 br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
250 opt_id, br_boolopt_get(br, opt_id), on, err);
258 void br_boolopt_multi_get(const struct net_bridge *br,
259 struct br_boolopt_multi *bm)
264 for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
265 optval |= (br_boolopt_get(br, opt_id) << opt_id);
268 bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
271 /* private bridge options, controlled by the kernel */
272 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
274 bool cur = !!br_opt_get(br, opt);
276 br_debug(br, "toggle option: %d state: %d -> %d\n",
283 set_bit(opt, &br->options);
285 clear_bit(opt, &br->options);
288 static void __net_exit br_net_exit(struct net *net)
290 struct net_device *dev;
294 for_each_netdev(net, dev)
295 if (dev->priv_flags & IFF_EBRIDGE)
296 br_dev_delete(dev, &list);
298 unregister_netdevice_many(&list);
303 static struct pernet_operations br_net_ops = {
307 static const struct stp_proto br_stp_proto = {
311 static int __init br_init(void)
315 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb));
317 err = stp_proto_register(&br_stp_proto);
319 pr_err("bridge: can't register sap for STP\n");
327 err = register_pernet_subsys(&br_net_ops);
331 err = br_nf_core_init();
335 err = register_netdevice_notifier(&br_device_notifier);
339 err = register_switchdev_notifier(&br_switchdev_notifier);
343 err = br_netlink_init();
347 brioctl_set(br_ioctl_deviceless_stub);
349 #if IS_ENABLED(CONFIG_ATM_LANE)
350 br_fdb_test_addr_hook = br_fdb_test_addr;
353 #if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
354 pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
355 "by default. Update your scripts to load br_netfilter if you "
362 unregister_switchdev_notifier(&br_switchdev_notifier);
364 unregister_netdevice_notifier(&br_device_notifier);
368 unregister_pernet_subsys(&br_net_ops);
372 stp_proto_unregister(&br_stp_proto);
376 static void __exit br_deinit(void)
378 stp_proto_unregister(&br_stp_proto);
380 unregister_switchdev_notifier(&br_switchdev_notifier);
381 unregister_netdevice_notifier(&br_device_notifier);
383 unregister_pernet_subsys(&br_net_ops);
385 rcu_barrier(); /* Wait for completion of call_rcu()'s */
388 #if IS_ENABLED(CONFIG_ATM_LANE)
389 br_fdb_test_addr_hook = NULL;
395 module_exit(br_deinit)
396 MODULE_LICENSE("GPL");
397 MODULE_VERSION(BR_VERSION);
398 MODULE_ALIAS_RTNL_LINK("bridge");