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1 | /* | |
2 | * Generic parts | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
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. | |
12 | */ | |
13 | ||
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 | * Handle changes in state of network devices enslaved to a bridge. | |
28 | * | |
29 | * Note: don't care about up/down if bridge itself is down, because | |
30 | * port state is checked when bridge is brought up. | |
31 | */ | |
32 | static 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 changed_addr; | |
38 | int err; | |
39 | ||
40 | /* register of bridge completed, add sysfs entries */ | |
41 | if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) { | |
42 | br_sysfs_addbr(dev); | |
43 | return NOTIFY_DONE; | |
44 | } | |
45 | ||
46 | /* not a port of a bridge */ | |
47 | p = br_port_get_rtnl(dev); | |
48 | if (!p) | |
49 | return NOTIFY_DONE; | |
50 | ||
51 | br = p->br; | |
52 | ||
53 | switch (event) { | |
54 | case NETDEV_CHANGEMTU: | |
55 | dev_set_mtu(br->dev, br_min_mtu(br)); | |
56 | break; | |
57 | ||
58 | case NETDEV_CHANGEADDR: | |
59 | spin_lock_bh(&br->lock); | |
60 | br_fdb_changeaddr(p, dev->dev_addr); | |
61 | changed_addr = br_stp_recalculate_bridge_id(br); | |
62 | spin_unlock_bh(&br->lock); | |
63 | ||
64 | if (changed_addr) | |
65 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); | |
66 | ||
67 | break; | |
68 | ||
69 | case NETDEV_CHANGE: | |
70 | br_port_carrier_check(p); | |
71 | break; | |
72 | ||
73 | case NETDEV_FEAT_CHANGE: | |
74 | netdev_update_features(br->dev); | |
75 | break; | |
76 | ||
77 | case NETDEV_DOWN: | |
78 | spin_lock_bh(&br->lock); | |
79 | if (br->dev->flags & IFF_UP) | |
80 | br_stp_disable_port(p); | |
81 | spin_unlock_bh(&br->lock); | |
82 | break; | |
83 | ||
84 | case NETDEV_UP: | |
85 | if (netif_running(br->dev) && netif_oper_up(dev)) { | |
86 | spin_lock_bh(&br->lock); | |
87 | br_stp_enable_port(p); | |
88 | spin_unlock_bh(&br->lock); | |
89 | } | |
90 | break; | |
91 | ||
92 | case NETDEV_UNREGISTER: | |
93 | br_del_if(br, dev); | |
94 | break; | |
95 | ||
96 | case NETDEV_CHANGENAME: | |
97 | err = br_sysfs_renameif(p); | |
98 | if (err) | |
99 | return notifier_from_errno(err); | |
100 | break; | |
101 | ||
102 | case NETDEV_PRE_TYPE_CHANGE: | |
103 | /* Forbid underlaying device to change its type. */ | |
104 | return NOTIFY_BAD; | |
105 | ||
106 | case NETDEV_RESEND_IGMP: | |
107 | /* Propagate to master device */ | |
108 | call_netdevice_notifiers(event, br->dev); | |
109 | break; | |
110 | } | |
111 | ||
112 | /* Events that may cause spanning tree to refresh */ | |
113 | if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || | |
114 | event == NETDEV_CHANGE || event == NETDEV_DOWN) | |
115 | br_ifinfo_notify(RTM_NEWLINK, NULL, p); | |
116 | ||
117 | return NOTIFY_DONE; | |
118 | } | |
119 | ||
120 | static struct notifier_block br_device_notifier = { | |
121 | .notifier_call = br_device_event | |
122 | }; | |
123 | ||
124 | /* called with RTNL or RCU */ | |
125 | static int br_switchdev_event(struct notifier_block *unused, | |
126 | unsigned long event, void *ptr) | |
127 | { | |
128 | struct net_device *dev = switchdev_notifier_info_to_dev(ptr); | |
129 | struct net_bridge_port *p; | |
130 | struct net_bridge *br; | |
131 | struct switchdev_notifier_fdb_info *fdb_info; | |
132 | int err = NOTIFY_DONE; | |
133 | ||
134 | p = br_port_get_rtnl_rcu(dev); | |
135 | if (!p) | |
136 | goto out; | |
137 | ||
138 | br = p->br; | |
139 | ||
140 | switch (event) { | |
141 | case SWITCHDEV_FDB_ADD_TO_BRIDGE: | |
142 | fdb_info = ptr; | |
143 | err = br_fdb_external_learn_add(br, p, fdb_info->addr, | |
144 | fdb_info->vid); | |
145 | if (err) { | |
146 | err = notifier_from_errno(err); | |
147 | break; | |
148 | } | |
149 | br_fdb_offloaded_set(br, p, fdb_info->addr, | |
150 | fdb_info->vid); | |
151 | break; | |
152 | case SWITCHDEV_FDB_DEL_TO_BRIDGE: | |
153 | fdb_info = ptr; | |
154 | err = br_fdb_external_learn_del(br, p, fdb_info->addr, | |
155 | fdb_info->vid); | |
156 | if (err) | |
157 | err = notifier_from_errno(err); | |
158 | break; | |
159 | case SWITCHDEV_FDB_OFFLOADED: | |
160 | fdb_info = ptr; | |
161 | br_fdb_offloaded_set(br, p, fdb_info->addr, | |
162 | fdb_info->vid); | |
163 | break; | |
164 | } | |
165 | ||
166 | out: | |
167 | return err; | |
168 | } | |
169 | ||
170 | static struct notifier_block br_switchdev_notifier = { | |
171 | .notifier_call = br_switchdev_event, | |
172 | }; | |
173 | ||
174 | static void __net_exit br_net_exit(struct net *net) | |
175 | { | |
176 | struct net_device *dev; | |
177 | LIST_HEAD(list); | |
178 | ||
179 | rtnl_lock(); | |
180 | for_each_netdev(net, dev) | |
181 | if (dev->priv_flags & IFF_EBRIDGE) | |
182 | br_dev_delete(dev, &list); | |
183 | ||
184 | unregister_netdevice_many(&list); | |
185 | rtnl_unlock(); | |
186 | ||
187 | } | |
188 | ||
189 | static struct pernet_operations br_net_ops = { | |
190 | .exit = br_net_exit, | |
191 | }; | |
192 | ||
193 | static const struct stp_proto br_stp_proto = { | |
194 | .rcv = br_stp_rcv, | |
195 | }; | |
196 | ||
197 | static int __init br_init(void) | |
198 | { | |
199 | int err; | |
200 | ||
201 | BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); | |
202 | ||
203 | err = stp_proto_register(&br_stp_proto); | |
204 | if (err < 0) { | |
205 | pr_err("bridge: can't register sap for STP\n"); | |
206 | return err; | |
207 | } | |
208 | ||
209 | err = br_fdb_init(); | |
210 | if (err) | |
211 | goto err_out; | |
212 | ||
213 | err = register_pernet_subsys(&br_net_ops); | |
214 | if (err) | |
215 | goto err_out1; | |
216 | ||
217 | err = br_nf_core_init(); | |
218 | if (err) | |
219 | goto err_out2; | |
220 | ||
221 | err = register_netdevice_notifier(&br_device_notifier); | |
222 | if (err) | |
223 | goto err_out3; | |
224 | ||
225 | err = register_switchdev_notifier(&br_switchdev_notifier); | |
226 | if (err) | |
227 | goto err_out4; | |
228 | ||
229 | err = br_netlink_init(); | |
230 | if (err) | |
231 | goto err_out5; | |
232 | ||
233 | brioctl_set(br_ioctl_deviceless_stub); | |
234 | ||
235 | #if IS_ENABLED(CONFIG_ATM_LANE) | |
236 | br_fdb_test_addr_hook = br_fdb_test_addr; | |
237 | #endif | |
238 | ||
239 | #if IS_MODULE(CONFIG_BRIDGE_NETFILTER) | |
240 | pr_info("bridge: filtering via arp/ip/ip6tables is no longer available " | |
241 | "by default. Update your scripts to load br_netfilter if you " | |
242 | "need this.\n"); | |
243 | #endif | |
244 | ||
245 | return 0; | |
246 | ||
247 | err_out5: | |
248 | unregister_switchdev_notifier(&br_switchdev_notifier); | |
249 | err_out4: | |
250 | unregister_netdevice_notifier(&br_device_notifier); | |
251 | err_out3: | |
252 | br_nf_core_fini(); | |
253 | err_out2: | |
254 | unregister_pernet_subsys(&br_net_ops); | |
255 | err_out1: | |
256 | br_fdb_fini(); | |
257 | err_out: | |
258 | stp_proto_unregister(&br_stp_proto); | |
259 | return err; | |
260 | } | |
261 | ||
262 | static void __exit br_deinit(void) | |
263 | { | |
264 | stp_proto_unregister(&br_stp_proto); | |
265 | br_netlink_fini(); | |
266 | unregister_switchdev_notifier(&br_switchdev_notifier); | |
267 | unregister_netdevice_notifier(&br_device_notifier); | |
268 | brioctl_set(NULL); | |
269 | unregister_pernet_subsys(&br_net_ops); | |
270 | ||
271 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ | |
272 | ||
273 | br_nf_core_fini(); | |
274 | #if IS_ENABLED(CONFIG_ATM_LANE) | |
275 | br_fdb_test_addr_hook = NULL; | |
276 | #endif | |
277 | br_fdb_fini(); | |
278 | } | |
279 | ||
280 | module_init(br_init) | |
281 | module_exit(br_deinit) | |
282 | MODULE_LICENSE("GPL"); | |
283 | MODULE_VERSION(BR_VERSION); | |
284 | MODULE_ALIAS_RTNL_LINK("bridge"); |