Merge remote-tracking branch 'omap_dss2/for-next'
[deliverable/linux.git] / net / bridge / br_device.c
1 /*
2 * Device handling code
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/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/netpoll.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/list.h>
20 #include <linux/netfilter_bridge.h>
21
22 #include <asm/uaccess.h>
23 #include "br_private.h"
24
25 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
26 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
27
28 const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
29 EXPORT_SYMBOL_GPL(nf_br_ops);
30
31 static struct lock_class_key bridge_netdev_addr_lock_key;
32
33 /* net device transmit always called with BH disabled */
34 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
35 {
36 struct net_bridge *br = netdev_priv(dev);
37 const unsigned char *dest = skb->data;
38 struct net_bridge_fdb_entry *dst;
39 struct net_bridge_mdb_entry *mdst;
40 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
41 const struct nf_br_ops *nf_ops;
42 u16 vid = 0;
43
44 rcu_read_lock();
45 nf_ops = rcu_dereference(nf_br_ops);
46 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
47 rcu_read_unlock();
48 return NETDEV_TX_OK;
49 }
50
51 u64_stats_update_begin(&brstats->syncp);
52 brstats->tx_packets++;
53 brstats->tx_bytes += skb->len;
54 u64_stats_update_end(&brstats->syncp);
55
56 BR_INPUT_SKB_CB(skb)->brdev = dev;
57
58 skb_reset_mac_header(skb);
59 skb_pull(skb, ETH_HLEN);
60
61 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
62 goto out;
63
64 if (is_broadcast_ether_addr(dest)) {
65 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
66 } else if (is_multicast_ether_addr(dest)) {
67 if (unlikely(netpoll_tx_running(dev))) {
68 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
69 goto out;
70 }
71 if (br_multicast_rcv(br, NULL, skb, vid)) {
72 kfree_skb(skb);
73 goto out;
74 }
75
76 mdst = br_mdb_get(br, skb, vid);
77 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
78 br_multicast_querier_exists(br, eth_hdr(skb)))
79 br_multicast_flood(mdst, skb, false, true);
80 else
81 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
82 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) {
83 br_forward(dst->dst, skb, false, true);
84 } else {
85 br_flood(br, skb, BR_PKT_UNICAST, false, true);
86 }
87 out:
88 rcu_read_unlock();
89 return NETDEV_TX_OK;
90 }
91
92 static void br_set_lockdep_class(struct net_device *dev)
93 {
94 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
95 }
96
97 static int br_dev_init(struct net_device *dev)
98 {
99 struct net_bridge *br = netdev_priv(dev);
100 int err;
101
102 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
103 if (!br->stats)
104 return -ENOMEM;
105
106 err = br_vlan_init(br);
107 if (err) {
108 free_percpu(br->stats);
109 return err;
110 }
111
112 err = br_multicast_init_stats(br);
113 if (err) {
114 free_percpu(br->stats);
115 br_vlan_flush(br);
116 }
117 br_set_lockdep_class(dev);
118
119 return err;
120 }
121
122 static int br_dev_open(struct net_device *dev)
123 {
124 struct net_bridge *br = netdev_priv(dev);
125
126 netdev_update_features(dev);
127 netif_start_queue(dev);
128 br_stp_enable_bridge(br);
129 br_multicast_open(br);
130
131 return 0;
132 }
133
134 static void br_dev_set_multicast_list(struct net_device *dev)
135 {
136 }
137
138 static void br_dev_change_rx_flags(struct net_device *dev, int change)
139 {
140 if (change & IFF_PROMISC)
141 br_manage_promisc(netdev_priv(dev));
142 }
143
144 static int br_dev_stop(struct net_device *dev)
145 {
146 struct net_bridge *br = netdev_priv(dev);
147
148 br_stp_disable_bridge(br);
149 br_multicast_stop(br);
150
151 netif_stop_queue(dev);
152
153 return 0;
154 }
155
156 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
157 struct rtnl_link_stats64 *stats)
158 {
159 struct net_bridge *br = netdev_priv(dev);
160 struct pcpu_sw_netstats tmp, sum = { 0 };
161 unsigned int cpu;
162
163 for_each_possible_cpu(cpu) {
164 unsigned int start;
165 const struct pcpu_sw_netstats *bstats
166 = per_cpu_ptr(br->stats, cpu);
167 do {
168 start = u64_stats_fetch_begin_irq(&bstats->syncp);
169 memcpy(&tmp, bstats, sizeof(tmp));
170 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
171 sum.tx_bytes += tmp.tx_bytes;
172 sum.tx_packets += tmp.tx_packets;
173 sum.rx_bytes += tmp.rx_bytes;
174 sum.rx_packets += tmp.rx_packets;
175 }
176
177 stats->tx_bytes = sum.tx_bytes;
178 stats->tx_packets = sum.tx_packets;
179 stats->rx_bytes = sum.rx_bytes;
180 stats->rx_packets = sum.rx_packets;
181
182 return stats;
183 }
184
185 static int br_change_mtu(struct net_device *dev, int new_mtu)
186 {
187 struct net_bridge *br = netdev_priv(dev);
188 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
189 return -EINVAL;
190
191 dev->mtu = new_mtu;
192
193 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
194 /* remember the MTU in the rtable for PMTU */
195 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
196 #endif
197
198 return 0;
199 }
200
201 /* Allow setting mac address to any valid ethernet address. */
202 static int br_set_mac_address(struct net_device *dev, void *p)
203 {
204 struct net_bridge *br = netdev_priv(dev);
205 struct sockaddr *addr = p;
206
207 if (!is_valid_ether_addr(addr->sa_data))
208 return -EADDRNOTAVAIL;
209
210 spin_lock_bh(&br->lock);
211 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
212 /* Mac address will be changed in br_stp_change_bridge_id(). */
213 br_stp_change_bridge_id(br, addr->sa_data);
214 }
215 spin_unlock_bh(&br->lock);
216
217 return 0;
218 }
219
220 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
221 {
222 strlcpy(info->driver, "bridge", sizeof(info->driver));
223 strlcpy(info->version, BR_VERSION, sizeof(info->version));
224 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
225 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
226 }
227
228 static netdev_features_t br_fix_features(struct net_device *dev,
229 netdev_features_t features)
230 {
231 struct net_bridge *br = netdev_priv(dev);
232
233 return br_features_recompute(br, features);
234 }
235
236 #ifdef CONFIG_NET_POLL_CONTROLLER
237 static void br_poll_controller(struct net_device *br_dev)
238 {
239 }
240
241 static void br_netpoll_cleanup(struct net_device *dev)
242 {
243 struct net_bridge *br = netdev_priv(dev);
244 struct net_bridge_port *p;
245
246 list_for_each_entry(p, &br->port_list, list)
247 br_netpoll_disable(p);
248 }
249
250 static int __br_netpoll_enable(struct net_bridge_port *p)
251 {
252 struct netpoll *np;
253 int err;
254
255 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
256 if (!np)
257 return -ENOMEM;
258
259 err = __netpoll_setup(np, p->dev);
260 if (err) {
261 kfree(np);
262 return err;
263 }
264
265 p->np = np;
266 return err;
267 }
268
269 int br_netpoll_enable(struct net_bridge_port *p)
270 {
271 if (!p->br->dev->npinfo)
272 return 0;
273
274 return __br_netpoll_enable(p);
275 }
276
277 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
278 {
279 struct net_bridge *br = netdev_priv(dev);
280 struct net_bridge_port *p;
281 int err = 0;
282
283 list_for_each_entry(p, &br->port_list, list) {
284 if (!p->dev)
285 continue;
286 err = __br_netpoll_enable(p);
287 if (err)
288 goto fail;
289 }
290
291 out:
292 return err;
293
294 fail:
295 br_netpoll_cleanup(dev);
296 goto out;
297 }
298
299 void br_netpoll_disable(struct net_bridge_port *p)
300 {
301 struct netpoll *np = p->np;
302
303 if (!np)
304 return;
305
306 p->np = NULL;
307
308 __netpoll_free_async(np);
309 }
310
311 #endif
312
313 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
314
315 {
316 struct net_bridge *br = netdev_priv(dev);
317
318 return br_add_if(br, slave_dev);
319 }
320
321 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
322 {
323 struct net_bridge *br = netdev_priv(dev);
324
325 return br_del_if(br, slave_dev);
326 }
327
328 static const struct ethtool_ops br_ethtool_ops = {
329 .get_drvinfo = br_getinfo,
330 .get_link = ethtool_op_get_link,
331 };
332
333 static const struct net_device_ops br_netdev_ops = {
334 .ndo_open = br_dev_open,
335 .ndo_stop = br_dev_stop,
336 .ndo_init = br_dev_init,
337 .ndo_start_xmit = br_dev_xmit,
338 .ndo_get_stats64 = br_get_stats64,
339 .ndo_set_mac_address = br_set_mac_address,
340 .ndo_set_rx_mode = br_dev_set_multicast_list,
341 .ndo_change_rx_flags = br_dev_change_rx_flags,
342 .ndo_change_mtu = br_change_mtu,
343 .ndo_do_ioctl = br_dev_ioctl,
344 #ifdef CONFIG_NET_POLL_CONTROLLER
345 .ndo_netpoll_setup = br_netpoll_setup,
346 .ndo_netpoll_cleanup = br_netpoll_cleanup,
347 .ndo_poll_controller = br_poll_controller,
348 #endif
349 .ndo_add_slave = br_add_slave,
350 .ndo_del_slave = br_del_slave,
351 .ndo_fix_features = br_fix_features,
352 .ndo_neigh_construct = netdev_default_l2upper_neigh_construct,
353 .ndo_neigh_destroy = netdev_default_l2upper_neigh_destroy,
354 .ndo_fdb_add = br_fdb_add,
355 .ndo_fdb_del = br_fdb_delete,
356 .ndo_fdb_dump = br_fdb_dump,
357 .ndo_bridge_getlink = br_getlink,
358 .ndo_bridge_setlink = br_setlink,
359 .ndo_bridge_dellink = br_dellink,
360 .ndo_features_check = passthru_features_check,
361 };
362
363 static void br_dev_free(struct net_device *dev)
364 {
365 struct net_bridge *br = netdev_priv(dev);
366
367 free_percpu(br->stats);
368 free_netdev(dev);
369 }
370
371 static struct device_type br_type = {
372 .name = "bridge",
373 };
374
375 void br_dev_setup(struct net_device *dev)
376 {
377 struct net_bridge *br = netdev_priv(dev);
378
379 eth_hw_addr_random(dev);
380 ether_setup(dev);
381
382 dev->netdev_ops = &br_netdev_ops;
383 dev->destructor = br_dev_free;
384 dev->ethtool_ops = &br_ethtool_ops;
385 SET_NETDEV_DEVTYPE(dev, &br_type);
386 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
387
388 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
389 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
390 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
391 NETIF_F_HW_VLAN_STAG_TX;
392 dev->vlan_features = COMMON_FEATURES;
393
394 br->dev = dev;
395 spin_lock_init(&br->lock);
396 INIT_LIST_HEAD(&br->port_list);
397 spin_lock_init(&br->hash_lock);
398
399 br->bridge_id.prio[0] = 0x80;
400 br->bridge_id.prio[1] = 0x00;
401
402 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
403
404 br->stp_enabled = BR_NO_STP;
405 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
406 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
407
408 br->designated_root = br->bridge_id;
409 br->bridge_max_age = br->max_age = 20 * HZ;
410 br->bridge_hello_time = br->hello_time = 2 * HZ;
411 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
412 br->ageing_time = BR_DEFAULT_AGEING_TIME;
413
414 br_netfilter_rtable_init(br);
415 br_stp_timer_init(br);
416 br_multicast_init(br);
417 }
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