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(); |
44661462 HX |
52 | if (is_broadcast_ether_addr(dest)) |
53 | br_flood_deliver(br, skb); | |
54 | else if (is_multicast_ether_addr(dest)) { | |
91d2c34a HX |
55 | if (unlikely(netpoll_tx_running(dev))) { |
56 | br_flood_deliver(br, skb); | |
57 | goto out; | |
58 | } | |
6d1d1d39 HX |
59 | if (br_multicast_rcv(br, NULL, skb)) { |
60 | kfree_skb(skb); | |
c4fcb78c | 61 | goto out; |
6d1d1d39 | 62 | } |
c4fcb78c HX |
63 | |
64 | mdst = br_mdb_get(br, skb); | |
32dec5dd | 65 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
c4fcb78c HX |
66 | br_multicast_deliver(mdst, skb); |
67 | else | |
68 | br_flood_deliver(br, skb); | |
69 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
1da177e4 LT |
70 | br_deliver(dst->dst, skb); |
71 | else | |
e081e1e3 | 72 | br_flood_deliver(br, skb); |
1da177e4 | 73 | |
c4fcb78c | 74 | out: |
eeaf61d8 | 75 | rcu_read_unlock(); |
6ed10654 | 76 | return NETDEV_TX_OK; |
1da177e4 LT |
77 | } |
78 | ||
bb900b27 | 79 | static int br_dev_init(struct net_device *dev) |
80 | { | |
81 | struct net_bridge *br = netdev_priv(dev); | |
82 | ||
83 | br->stats = alloc_percpu(struct br_cpu_netstats); | |
84 | if (!br->stats) | |
85 | return -ENOMEM; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
1da177e4 LT |
90 | static int br_dev_open(struct net_device *dev) |
91 | { | |
81d35307 | 92 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 93 | |
c4d27ef9 | 94 | netdev_update_features(dev); |
81d35307 SH |
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 | ||
110 | br_stp_disable_bridge(br); | |
111 | br_multicast_stop(br); | |
1da177e4 LT |
112 | |
113 | netif_stop_queue(dev); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
28172739 ED |
118 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
119 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 120 | { |
121 | struct net_bridge *br = netdev_priv(dev); | |
406818ff | 122 | struct br_cpu_netstats tmp, sum = { 0 }; |
14bb4789 | 123 | unsigned int cpu; |
124 | ||
125 | for_each_possible_cpu(cpu) { | |
406818ff | 126 | unsigned int start; |
14bb4789 | 127 | const struct br_cpu_netstats *bstats |
128 | = per_cpu_ptr(br->stats, cpu); | |
406818ff ED |
129 | do { |
130 | start = u64_stats_fetch_begin(&bstats->syncp); | |
131 | memcpy(&tmp, bstats, sizeof(tmp)); | |
132 | } while (u64_stats_fetch_retry(&bstats->syncp, start)); | |
133 | sum.tx_bytes += tmp.tx_bytes; | |
134 | sum.tx_packets += tmp.tx_packets; | |
135 | sum.rx_bytes += tmp.rx_bytes; | |
136 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 137 | } |
138 | ||
139 | stats->tx_bytes = sum.tx_bytes; | |
140 | stats->tx_packets = sum.tx_packets; | |
141 | stats->rx_bytes = sum.rx_bytes; | |
142 | stats->rx_packets = sum.rx_packets; | |
143 | ||
144 | return stats; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
148 | { | |
4adf0af6 SW |
149 | struct net_bridge *br = netdev_priv(dev); |
150 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
151 | return -EINVAL; |
152 | ||
153 | dev->mtu = new_mtu; | |
4adf0af6 SW |
154 | |
155 | #ifdef CONFIG_BRIDGE_NETFILTER | |
156 | /* remember the MTU in the rtable for PMTU */ | |
defb3519 | 157 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
158 | #endif |
159 | ||
1da177e4 LT |
160 | return 0; |
161 | } | |
162 | ||
ffe1d49c | 163 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
164 | static int br_set_mac_address(struct net_device *dev, void *p) |
165 | { | |
166 | struct net_bridge *br = netdev_priv(dev); | |
167 | struct sockaddr *addr = p; | |
ffe1d49c SH |
168 | |
169 | if (!is_valid_ether_addr(addr->sa_data)) | |
170 | return -EINVAL; | |
4505a3ef SH |
171 | |
172 | spin_lock_bh(&br->lock); | |
ffe1d49c SH |
173 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
174 | br_stp_change_bridge_id(br, addr->sa_data); | |
92c0574f | 175 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
176 | spin_unlock_bh(&br->lock); |
177 | ||
ffe1d49c | 178 | return 0; |
4505a3ef SH |
179 | } |
180 | ||
edb5e46f SH |
181 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
182 | { | |
183 | strcpy(info->driver, "bridge"); | |
184 | strcpy(info->version, BR_VERSION); | |
185 | strcpy(info->fw_version, "N/A"); | |
186 | strcpy(info->bus_info, "N/A"); | |
187 | } | |
188 | ||
c4d27ef9 | 189 | static u32 br_fix_features(struct net_device *dev, u32 features) |
edb5e46f SH |
190 | { |
191 | struct net_bridge *br = netdev_priv(dev); | |
192 | ||
c4d27ef9 | 193 | return br_features_recompute(br, features); |
361ff8a6 JG |
194 | } |
195 | ||
c06ee961 | 196 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 197 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 198 | { |
c06ee961 WC |
199 | } |
200 | ||
91d2c34a | 201 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 202 | { |
91d2c34a HX |
203 | struct net_bridge *br = netdev_priv(dev); |
204 | struct net_bridge_port *p, *n; | |
c06ee961 | 205 | |
91d2c34a HX |
206 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
207 | br_netpoll_disable(p); | |
208 | } | |
c06ee961 WC |
209 | } |
210 | ||
91d2c34a | 211 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 212 | { |
cfb478da | 213 | struct net_bridge *br = netdev_priv(dev); |
c06ee961 | 214 | struct net_bridge_port *p, *n; |
91d2c34a | 215 | int err = 0; |
c06ee961 | 216 | |
c06ee961 | 217 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
91d2c34a HX |
218 | if (!p->dev) |
219 | continue; | |
220 | ||
221 | err = br_netpoll_enable(p); | |
222 | if (err) | |
223 | goto fail; | |
c06ee961 | 224 | } |
91d2c34a HX |
225 | |
226 | out: | |
227 | return err; | |
228 | ||
229 | fail: | |
230 | br_netpoll_cleanup(dev); | |
231 | goto out; | |
c06ee961 WC |
232 | } |
233 | ||
91d2c34a | 234 | int br_netpoll_enable(struct net_bridge_port *p) |
cfb478da | 235 | { |
91d2c34a HX |
236 | struct netpoll *np; |
237 | int err = 0; | |
238 | ||
239 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); | |
240 | err = -ENOMEM; | |
241 | if (!np) | |
242 | goto out; | |
243 | ||
244 | np->dev = p->dev; | |
cefa9993 | 245 | strlcpy(np->dev_name, p->dev->name, IFNAMSIZ); |
91d2c34a HX |
246 | |
247 | err = __netpoll_setup(np); | |
248 | if (err) { | |
249 | kfree(np); | |
250 | goto out; | |
251 | } | |
252 | ||
253 | p->np = np; | |
254 | ||
255 | out: | |
256 | return err; | |
cfb478da | 257 | } |
c06ee961 | 258 | |
91d2c34a | 259 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 260 | { |
91d2c34a HX |
261 | struct netpoll *np = p->np; |
262 | ||
263 | if (!np) | |
264 | return; | |
265 | ||
266 | p->np = NULL; | |
267 | ||
268 | /* Wait for transmitting packets to finish before freeing. */ | |
269 | synchronize_rcu_bh(); | |
270 | ||
271 | __netpoll_cleanup(np); | |
272 | kfree(np); | |
c06ee961 WC |
273 | } |
274 | ||
275 | #endif | |
276 | ||
afc6151a JP |
277 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
278 | ||
279 | { | |
280 | struct net_bridge *br = netdev_priv(dev); | |
281 | ||
282 | return br_add_if(br, slave_dev); | |
283 | } | |
284 | ||
285 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
286 | { | |
287 | struct net_bridge *br = netdev_priv(dev); | |
288 | ||
289 | return br_del_if(br, slave_dev); | |
290 | } | |
291 | ||
a2dbb882 | 292 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
293 | .get_drvinfo = br_getinfo, |
294 | .get_link = ethtool_op_get_link, | |
edb5e46f SH |
295 | }; |
296 | ||
a2dbb882 SH |
297 | static const struct net_device_ops br_netdev_ops = { |
298 | .ndo_open = br_dev_open, | |
299 | .ndo_stop = br_dev_stop, | |
bb900b27 | 300 | .ndo_init = br_dev_init, |
00829823 | 301 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 302 | .ndo_get_stats64 = br_get_stats64, |
00829823 SH |
303 | .ndo_set_mac_address = br_set_mac_address, |
304 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
305 | .ndo_change_mtu = br_change_mtu, | |
306 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 307 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 308 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
309 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
310 | .ndo_poll_controller = br_poll_controller, | |
311 | #endif | |
afc6151a JP |
312 | .ndo_add_slave = br_add_slave, |
313 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 314 | .ndo_fix_features = br_fix_features, |
a2dbb882 SH |
315 | }; |
316 | ||
14bb4789 | 317 | static void br_dev_free(struct net_device *dev) |
318 | { | |
319 | struct net_bridge *br = netdev_priv(dev); | |
320 | ||
321 | free_percpu(br->stats); | |
322 | free_netdev(dev); | |
323 | } | |
324 | ||
bb900b27 | 325 | static struct device_type br_type = { |
326 | .name = "bridge", | |
327 | }; | |
328 | ||
1da177e4 LT |
329 | void br_dev_setup(struct net_device *dev) |
330 | { | |
bb900b27 | 331 | struct net_bridge *br = netdev_priv(dev); |
332 | ||
3ae41254 | 333 | random_ether_addr(dev->dev_addr); |
1da177e4 LT |
334 | ether_setup(dev); |
335 | ||
a2dbb882 | 336 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 337 | dev->destructor = br_dev_free; |
9d6f229f | 338 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
bb900b27 | 339 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 340 | dev->tx_queue_len = 0; |
1da177e4 | 341 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 342 | |
9d6f229f | 343 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
4aa678ba | 344 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
c4d27ef9 MM |
345 | NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX; |
346 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | | |
347 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | | |
348 | NETIF_F_HW_VLAN_TX; | |
bb900b27 | 349 | |
350 | br->dev = dev; | |
351 | spin_lock_init(&br->lock); | |
352 | INIT_LIST_HEAD(&br->port_list); | |
353 | spin_lock_init(&br->hash_lock); | |
354 | ||
355 | br->bridge_id.prio[0] = 0x80; | |
356 | br->bridge_id.prio[1] = 0x00; | |
357 | ||
358 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
359 | ||
bb900b27 | 360 | br->stp_enabled = BR_NO_STP; |
361 | br->designated_root = br->bridge_id; | |
362 | br->bridge_max_age = br->max_age = 20 * HZ; | |
363 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
364 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
365 | br->ageing_time = 300 * HZ; | |
366 | ||
367 | br_netfilter_rtable_init(br); | |
368 | br_stp_timer_init(br); | |
369 | br_multicast_init(br); | |
1da177e4 | 370 | } |