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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>
20#include <net/llc.h>
21#include <net/stp.h>
22#include <net/switchdev.h>
23
24#include "br_private.h"
25
26
27
28
29
30
31
32static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
33{
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;
38 bool changed_addr;
39 int err;
40
41
42 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
43 br_sysfs_addbr(dev);
44 return NOTIFY_DONE;
45 }
46
47
48 p = br_port_get_rtnl(dev);
49 if (!p)
50 return NOTIFY_DONE;
51
52 br = p->br;
53
54 switch (event) {
55 case NETDEV_CHANGEMTU:
56 br_mtu_auto_adjust(br);
57 break;
58
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);
64
65 if (changed_addr)
66 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
67
68 break;
69
70 case NETDEV_CHANGE:
71 br_port_carrier_check(p, ¬ified);
72 break;
73
74 case NETDEV_FEAT_CHANGE:
75 netdev_update_features(br->dev);
76 break;
77
78 case NETDEV_DOWN:
79 spin_lock_bh(&br->lock);
80 if (br->dev->flags & IFF_UP) {
81 br_stp_disable_port(p);
82 notified = true;
83 }
84 spin_unlock_bh(&br->lock);
85 break;
86
87 case NETDEV_UP:
88 if (netif_running(br->dev) && netif_oper_up(dev)) {
89 spin_lock_bh(&br->lock);
90 br_stp_enable_port(p);
91 notified = true;
92 spin_unlock_bh(&br->lock);
93 }
94 break;
95
96 case NETDEV_UNREGISTER:
97 br_del_if(br, dev);
98 break;
99
100 case NETDEV_CHANGENAME:
101 err = br_sysfs_renameif(p);
102 if (err)
103 return notifier_from_errno(err);
104 break;
105
106 case NETDEV_PRE_TYPE_CHANGE:
107
108 return NOTIFY_BAD;
109
110 case NETDEV_RESEND_IGMP:
111
112 call_netdevice_notifiers(event, br->dev);
113 break;
114 }
115
116
117 if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
118 event == NETDEV_CHANGE || event == NETDEV_DOWN))
119 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
120
121 return NOTIFY_DONE;
122}
123
124static struct notifier_block br_device_notifier = {
125 .notifier_call = br_device_event
126};
127
128
129static int br_switchdev_event(struct notifier_block *unused,
130 unsigned long event, void *ptr)
131{
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;
137
138 p = br_port_get_rtnl_rcu(dev);
139 if (!p)
140 goto out;
141
142 br = p->br;
143
144 switch (event) {
145 case SWITCHDEV_FDB_ADD_TO_BRIDGE:
146 fdb_info = ptr;
147 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
148 fdb_info->vid, false);
149 if (err) {
150 err = notifier_from_errno(err);
151 break;
152 }
153 br_fdb_offloaded_set(br, p, fdb_info->addr,
154 fdb_info->vid);
155 break;
156 case SWITCHDEV_FDB_DEL_TO_BRIDGE:
157 fdb_info = ptr;
158 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
159 fdb_info->vid, false);
160 if (err)
161 err = notifier_from_errno(err);
162 break;
163 case SWITCHDEV_FDB_OFFLOADED:
164 fdb_info = ptr;
165 br_fdb_offloaded_set(br, p, fdb_info->addr,
166 fdb_info->vid);
167 break;
168 }
169
170out:
171 return err;
172}
173
174static struct notifier_block br_switchdev_notifier = {
175 .notifier_call = br_switchdev_event,
176};
177
178static void __net_exit br_net_exit(struct net *net)
179{
180 struct net_device *dev;
181 LIST_HEAD(list);
182
183 rtnl_lock();
184 for_each_netdev(net, dev)
185 if (dev->priv_flags & IFF_EBRIDGE)
186 br_dev_delete(dev, &list);
187
188 unregister_netdevice_many(&list);
189 rtnl_unlock();
190
191}
192
193static struct pernet_operations br_net_ops = {
194 .exit = br_net_exit,
195};
196
197static const struct stp_proto br_stp_proto = {
198 .rcv = br_stp_rcv,
199};
200
201static int __init br_init(void)
202{
203 int err;
204
205 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
206
207 err = stp_proto_register(&br_stp_proto);
208 if (err < 0) {
209 pr_err("bridge: can't register sap for STP\n");
210 return err;
211 }
212
213 err = br_fdb_init();
214 if (err)
215 goto err_out;
216
217 err = register_pernet_subsys(&br_net_ops);
218 if (err)
219 goto err_out1;
220
221 err = br_nf_core_init();
222 if (err)
223 goto err_out2;
224
225 err = register_netdevice_notifier(&br_device_notifier);
226 if (err)
227 goto err_out3;
228
229 err = register_switchdev_notifier(&br_switchdev_notifier);
230 if (err)
231 goto err_out4;
232
233 err = br_netlink_init();
234 if (err)
235 goto err_out5;
236
237 brioctl_set(br_ioctl_deviceless_stub);
238
239#if IS_ENABLED(CONFIG_ATM_LANE)
240 br_fdb_test_addr_hook = br_fdb_test_addr;
241#endif
242
243#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
244 pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
245 "by default. Update your scripts to load br_netfilter if you "
246 "need this.\n");
247#endif
248
249 return 0;
250
251err_out5:
252 unregister_switchdev_notifier(&br_switchdev_notifier);
253err_out4:
254 unregister_netdevice_notifier(&br_device_notifier);
255err_out3:
256 br_nf_core_fini();
257err_out2:
258 unregister_pernet_subsys(&br_net_ops);
259err_out1:
260 br_fdb_fini();
261err_out:
262 stp_proto_unregister(&br_stp_proto);
263 return err;
264}
265
266static void __exit br_deinit(void)
267{
268 stp_proto_unregister(&br_stp_proto);
269 br_netlink_fini();
270 unregister_switchdev_notifier(&br_switchdev_notifier);
271 unregister_netdevice_notifier(&br_device_notifier);
272 brioctl_set(NULL);
273 unregister_pernet_subsys(&br_net_ops);
274
275 rcu_barrier();
276
277 br_nf_core_fini();
278#if IS_ENABLED(CONFIG_ATM_LANE)
279 br_fdb_test_addr_hook = NULL;
280#endif
281 br_fdb_fini();
282}
283
284module_init(br_init)
285module_exit(br_deinit)
286MODULE_LICENSE("GPL");
287MODULE_VERSION(BR_VERSION);
288MODULE_ALIAS_RTNL_LINK("bridge");
289
