Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Device handling code | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
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> | |
c06ee961 | 16 | #include <linux/netpoll.h> |
4505a3ef | 17 | #include <linux/etherdevice.h> |
edb5e46f | 18 | #include <linux/ethtool.h> |
c06ee961 | 19 | #include <linux/list.h> |
ea2d9b41 | 20 | #include <linux/netfilter_bridge.h> |
4505a3ef | 21 | |
1da177e4 LT |
22 | #include <asm/uaccess.h> |
23 | #include "br_private.h" | |
24 | ||
eeaf61d8 | 25 | /* net device transmit always called with BH disabled */ |
6fef4c0c | 26 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
27 | { |
28 | struct net_bridge *br = netdev_priv(dev); | |
29 | const unsigned char *dest = skb->data; | |
30 | struct net_bridge_fdb_entry *dst; | |
c4fcb78c | 31 | struct net_bridge_mdb_entry *mdst; |
14bb4789 | 32 | struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats); |
1da177e4 | 33 | |
ea2d9b41 BDS |
34 | #ifdef CONFIG_BRIDGE_NETFILTER |
35 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { | |
36 | br_nf_pre_routing_finish_bridge_slow(skb); | |
37 | return NETDEV_TX_OK; | |
38 | } | |
39 | #endif | |
40 | ||
406818ff | 41 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 42 | brstats->tx_packets++; |
43 | brstats->tx_bytes += skb->len; | |
406818ff | 44 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 45 | |
14bb4789 | 46 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 47 | |
459a98ed | 48 | skb_reset_mac_header(skb); |
1da177e4 LT |
49 | skb_pull(skb, ETH_HLEN); |
50 | ||
eeaf61d8 | 51 | rcu_read_lock(); |
7180f775 | 52 | if (is_multicast_ether_addr(dest)) { |
91d2c34a HX |
53 | if (unlikely(netpoll_tx_running(dev))) { |
54 | br_flood_deliver(br, skb); | |
55 | goto out; | |
56 | } | |
6d1d1d39 HX |
57 | if (br_multicast_rcv(br, NULL, skb)) { |
58 | kfree_skb(skb); | |
c4fcb78c | 59 | goto out; |
6d1d1d39 | 60 | } |
c4fcb78c HX |
61 | |
62 | mdst = br_mdb_get(br, skb); | |
32dec5dd | 63 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
c4fcb78c HX |
64 | br_multicast_deliver(mdst, skb); |
65 | else | |
66 | br_flood_deliver(br, skb); | |
67 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
1da177e4 LT |
68 | br_deliver(dst->dst, skb); |
69 | else | |
e081e1e3 | 70 | br_flood_deliver(br, skb); |
1da177e4 | 71 | |
c4fcb78c | 72 | out: |
eeaf61d8 | 73 | rcu_read_unlock(); |
6ed10654 | 74 | return NETDEV_TX_OK; |
1da177e4 LT |
75 | } |
76 | ||
bb900b27 | 77 | static int br_dev_init(struct net_device *dev) |
78 | { | |
79 | struct net_bridge *br = netdev_priv(dev); | |
80 | ||
81 | br->stats = alloc_percpu(struct br_cpu_netstats); | |
82 | if (!br->stats) | |
83 | return -ENOMEM; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | static int br_dev_open(struct net_device *dev) |
89 | { | |
81d35307 | 90 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 91 | |
1faa4356 | 92 | netif_carrier_off(dev); |
93 | ||
81d35307 SH |
94 | br_features_recompute(br); |
95 | netif_start_queue(dev); | |
96 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 97 | br_multicast_open(br); |
1da177e4 LT |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static void br_dev_set_multicast_list(struct net_device *dev) | |
103 | { | |
104 | } | |
105 | ||
106 | static int br_dev_stop(struct net_device *dev) | |
107 | { | |
3fe2d7c7 HX |
108 | struct net_bridge *br = netdev_priv(dev); |
109 | ||
1faa4356 | 110 | netif_carrier_off(dev); |
111 | ||
3fe2d7c7 HX |
112 | br_stp_disable_bridge(br); |
113 | br_multicast_stop(br); | |
1da177e4 LT |
114 | |
115 | netif_stop_queue(dev); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
28172739 ED |
120 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
121 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 122 | { |
123 | struct net_bridge *br = netdev_priv(dev); | |
406818ff | 124 | struct br_cpu_netstats tmp, sum = { 0 }; |
14bb4789 | 125 | unsigned int cpu; |
126 | ||
127 | for_each_possible_cpu(cpu) { | |
406818ff | 128 | unsigned int start; |
14bb4789 | 129 | const struct br_cpu_netstats *bstats |
130 | = per_cpu_ptr(br->stats, cpu); | |
406818ff ED |
131 | do { |
132 | start = u64_stats_fetch_begin(&bstats->syncp); | |
133 | memcpy(&tmp, bstats, sizeof(tmp)); | |
134 | } while (u64_stats_fetch_retry(&bstats->syncp, start)); | |
135 | sum.tx_bytes += tmp.tx_bytes; | |
136 | sum.tx_packets += tmp.tx_packets; | |
137 | sum.rx_bytes += tmp.rx_bytes; | |
138 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 139 | } |
140 | ||
141 | stats->tx_bytes = sum.tx_bytes; | |
142 | stats->tx_packets = sum.tx_packets; | |
143 | stats->rx_bytes = sum.rx_bytes; | |
144 | stats->rx_packets = sum.rx_packets; | |
145 | ||
146 | return stats; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
150 | { | |
4adf0af6 SW |
151 | struct net_bridge *br = netdev_priv(dev); |
152 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
153 | return -EINVAL; |
154 | ||
155 | dev->mtu = new_mtu; | |
4adf0af6 SW |
156 | |
157 | #ifdef CONFIG_BRIDGE_NETFILTER | |
158 | /* remember the MTU in the rtable for PMTU */ | |
defb3519 | 159 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
160 | #endif |
161 | ||
1da177e4 LT |
162 | return 0; |
163 | } | |
164 | ||
ffe1d49c | 165 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
166 | static int br_set_mac_address(struct net_device *dev, void *p) |
167 | { | |
168 | struct net_bridge *br = netdev_priv(dev); | |
169 | struct sockaddr *addr = p; | |
ffe1d49c SH |
170 | |
171 | if (!is_valid_ether_addr(addr->sa_data)) | |
172 | return -EINVAL; | |
4505a3ef SH |
173 | |
174 | spin_lock_bh(&br->lock); | |
ffe1d49c SH |
175 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
176 | br_stp_change_bridge_id(br, addr->sa_data); | |
92c0574f | 177 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
178 | spin_unlock_bh(&br->lock); |
179 | ||
ffe1d49c | 180 | return 0; |
4505a3ef SH |
181 | } |
182 | ||
edb5e46f SH |
183 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
184 | { | |
185 | strcpy(info->driver, "bridge"); | |
186 | strcpy(info->version, BR_VERSION); | |
187 | strcpy(info->fw_version, "N/A"); | |
188 | strcpy(info->bus_info, "N/A"); | |
189 | } | |
190 | ||
191 | static int br_set_sg(struct net_device *dev, u32 data) | |
192 | { | |
193 | struct net_bridge *br = netdev_priv(dev); | |
194 | ||
195 | if (data) | |
196 | br->feature_mask |= NETIF_F_SG; | |
197 | else | |
198 | br->feature_mask &= ~NETIF_F_SG; | |
199 | ||
200 | br_features_recompute(br); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int br_set_tso(struct net_device *dev, u32 data) | |
205 | { | |
206 | struct net_bridge *br = netdev_priv(dev); | |
207 | ||
208 | if (data) | |
209 | br->feature_mask |= NETIF_F_TSO; | |
210 | else | |
211 | br->feature_mask &= ~NETIF_F_TSO; | |
212 | ||
213 | br_features_recompute(br); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int br_set_tx_csum(struct net_device *dev, u32 data) | |
218 | { | |
219 | struct net_bridge *br = netdev_priv(dev); | |
220 | ||
221 | if (data) | |
2c6cc0d8 | 222 | br->feature_mask |= NETIF_F_NO_CSUM; |
edb5e46f | 223 | else |
2c6cc0d8 | 224 | br->feature_mask &= ~NETIF_F_ALL_CSUM; |
edb5e46f SH |
225 | |
226 | br_features_recompute(br); | |
227 | return 0; | |
228 | } | |
229 | ||
361ff8a6 JG |
230 | static int br_set_flags(struct net_device *netdev, u32 data) |
231 | { | |
232 | return ethtool_op_set_flags(netdev, data, ETH_FLAG_TXVLAN); | |
233 | } | |
234 | ||
c06ee961 | 235 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 236 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 237 | { |
c06ee961 WC |
238 | } |
239 | ||
91d2c34a | 240 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 241 | { |
91d2c34a HX |
242 | struct net_bridge *br = netdev_priv(dev); |
243 | struct net_bridge_port *p, *n; | |
c06ee961 | 244 | |
91d2c34a HX |
245 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
246 | br_netpoll_disable(p); | |
247 | } | |
c06ee961 WC |
248 | } |
249 | ||
91d2c34a | 250 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 251 | { |
cfb478da | 252 | struct net_bridge *br = netdev_priv(dev); |
c06ee961 | 253 | struct net_bridge_port *p, *n; |
91d2c34a | 254 | int err = 0; |
c06ee961 | 255 | |
c06ee961 | 256 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
91d2c34a HX |
257 | if (!p->dev) |
258 | continue; | |
259 | ||
260 | err = br_netpoll_enable(p); | |
261 | if (err) | |
262 | goto fail; | |
c06ee961 | 263 | } |
91d2c34a HX |
264 | |
265 | out: | |
266 | return err; | |
267 | ||
268 | fail: | |
269 | br_netpoll_cleanup(dev); | |
270 | goto out; | |
c06ee961 WC |
271 | } |
272 | ||
91d2c34a | 273 | int br_netpoll_enable(struct net_bridge_port *p) |
cfb478da | 274 | { |
91d2c34a HX |
275 | struct netpoll *np; |
276 | int err = 0; | |
277 | ||
278 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); | |
279 | err = -ENOMEM; | |
280 | if (!np) | |
281 | goto out; | |
282 | ||
283 | np->dev = p->dev; | |
284 | ||
285 | err = __netpoll_setup(np); | |
286 | if (err) { | |
287 | kfree(np); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | p->np = np; | |
292 | ||
293 | out: | |
294 | return err; | |
cfb478da | 295 | } |
c06ee961 | 296 | |
91d2c34a | 297 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 298 | { |
91d2c34a HX |
299 | struct netpoll *np = p->np; |
300 | ||
301 | if (!np) | |
302 | return; | |
303 | ||
304 | p->np = NULL; | |
305 | ||
306 | /* Wait for transmitting packets to finish before freeing. */ | |
307 | synchronize_rcu_bh(); | |
308 | ||
309 | __netpoll_cleanup(np); | |
310 | kfree(np); | |
c06ee961 WC |
311 | } |
312 | ||
313 | #endif | |
314 | ||
afc6151a JP |
315 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
316 | ||
317 | { | |
318 | struct net_bridge *br = netdev_priv(dev); | |
319 | ||
320 | return br_add_if(br, slave_dev); | |
321 | } | |
322 | ||
323 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
324 | { | |
325 | struct net_bridge *br = netdev_priv(dev); | |
326 | ||
327 | return br_del_if(br, slave_dev); | |
328 | } | |
329 | ||
a2dbb882 | 330 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
331 | .get_drvinfo = br_getinfo, |
332 | .get_link = ethtool_op_get_link, | |
333 | .get_tx_csum = ethtool_op_get_tx_csum, | |
334 | .set_tx_csum = br_set_tx_csum, | |
335 | .get_sg = ethtool_op_get_sg, | |
336 | .set_sg = br_set_sg, | |
337 | .get_tso = ethtool_op_get_tso, | |
338 | .set_tso = br_set_tso, | |
339 | .get_ufo = ethtool_op_get_ufo, | |
72dad218 | 340 | .set_ufo = ethtool_op_set_ufo, |
e4119a43 | 341 | .get_flags = ethtool_op_get_flags, |
361ff8a6 | 342 | .set_flags = br_set_flags, |
edb5e46f SH |
343 | }; |
344 | ||
a2dbb882 SH |
345 | static const struct net_device_ops br_netdev_ops = { |
346 | .ndo_open = br_dev_open, | |
347 | .ndo_stop = br_dev_stop, | |
bb900b27 | 348 | .ndo_init = br_dev_init, |
00829823 | 349 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 350 | .ndo_get_stats64 = br_get_stats64, |
00829823 SH |
351 | .ndo_set_mac_address = br_set_mac_address, |
352 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
353 | .ndo_change_mtu = br_change_mtu, | |
354 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 355 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 356 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
357 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
358 | .ndo_poll_controller = br_poll_controller, | |
359 | #endif | |
afc6151a JP |
360 | .ndo_add_slave = br_add_slave, |
361 | .ndo_del_slave = br_del_slave, | |
a2dbb882 SH |
362 | }; |
363 | ||
14bb4789 | 364 | static void br_dev_free(struct net_device *dev) |
365 | { | |
366 | struct net_bridge *br = netdev_priv(dev); | |
367 | ||
368 | free_percpu(br->stats); | |
369 | free_netdev(dev); | |
370 | } | |
371 | ||
bb900b27 | 372 | static struct device_type br_type = { |
373 | .name = "bridge", | |
374 | }; | |
375 | ||
1da177e4 LT |
376 | void br_dev_setup(struct net_device *dev) |
377 | { | |
bb900b27 | 378 | struct net_bridge *br = netdev_priv(dev); |
379 | ||
3ae41254 | 380 | random_ether_addr(dev->dev_addr); |
1da177e4 LT |
381 | ether_setup(dev); |
382 | ||
a2dbb882 | 383 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 384 | dev->destructor = br_dev_free; |
9d6f229f | 385 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
bb900b27 | 386 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 387 | dev->tx_queue_len = 0; |
1da177e4 | 388 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 389 | |
9d6f229f | 390 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
4aa678ba | 391 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
361ff8a6 | 392 | NETIF_F_NETNS_LOCAL | NETIF_F_GSO | NETIF_F_HW_VLAN_TX; |
bb900b27 | 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 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
403 | ||
404 | br->feature_mask = dev->features; | |
405 | br->stp_enabled = BR_NO_STP; | |
406 | br->designated_root = br->bridge_id; | |
407 | br->bridge_max_age = br->max_age = 20 * HZ; | |
408 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
409 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
410 | br->ageing_time = 300 * HZ; | |
411 | ||
412 | br_netfilter_rtable_init(br); | |
413 | br_stp_timer_init(br); | |
414 | br_multicast_init(br); | |
1da177e4 | 415 | } |