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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); |
c4d27ef9 | 93 | netdev_update_features(dev); |
81d35307 SH |
94 | netif_start_queue(dev); |
95 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 96 | br_multicast_open(br); |
1da177e4 LT |
97 | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void br_dev_set_multicast_list(struct net_device *dev) | |
102 | { | |
103 | } | |
104 | ||
105 | static int br_dev_stop(struct net_device *dev) | |
106 | { | |
3fe2d7c7 HX |
107 | struct net_bridge *br = netdev_priv(dev); |
108 | ||
1faa4356 | 109 | netif_carrier_off(dev); |
110 | ||
3fe2d7c7 HX |
111 | br_stp_disable_bridge(br); |
112 | br_multicast_stop(br); | |
1da177e4 LT |
113 | |
114 | netif_stop_queue(dev); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
28172739 ED |
119 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
120 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 121 | { |
122 | struct net_bridge *br = netdev_priv(dev); | |
406818ff | 123 | struct br_cpu_netstats tmp, sum = { 0 }; |
14bb4789 | 124 | unsigned int cpu; |
125 | ||
126 | for_each_possible_cpu(cpu) { | |
406818ff | 127 | unsigned int start; |
14bb4789 | 128 | const struct br_cpu_netstats *bstats |
129 | = per_cpu_ptr(br->stats, cpu); | |
406818ff ED |
130 | do { |
131 | start = u64_stats_fetch_begin(&bstats->syncp); | |
132 | memcpy(&tmp, bstats, sizeof(tmp)); | |
133 | } while (u64_stats_fetch_retry(&bstats->syncp, start)); | |
134 | sum.tx_bytes += tmp.tx_bytes; | |
135 | sum.tx_packets += tmp.tx_packets; | |
136 | sum.rx_bytes += tmp.rx_bytes; | |
137 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 138 | } |
139 | ||
140 | stats->tx_bytes = sum.tx_bytes; | |
141 | stats->tx_packets = sum.tx_packets; | |
142 | stats->rx_bytes = sum.rx_bytes; | |
143 | stats->rx_packets = sum.rx_packets; | |
144 | ||
145 | return stats; | |
146 | } | |
147 | ||
1da177e4 LT |
148 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
149 | { | |
4adf0af6 SW |
150 | struct net_bridge *br = netdev_priv(dev); |
151 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
152 | return -EINVAL; |
153 | ||
154 | dev->mtu = new_mtu; | |
4adf0af6 SW |
155 | |
156 | #ifdef CONFIG_BRIDGE_NETFILTER | |
157 | /* remember the MTU in the rtable for PMTU */ | |
defb3519 | 158 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
159 | #endif |
160 | ||
1da177e4 LT |
161 | return 0; |
162 | } | |
163 | ||
ffe1d49c | 164 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
165 | static int br_set_mac_address(struct net_device *dev, void *p) |
166 | { | |
167 | struct net_bridge *br = netdev_priv(dev); | |
168 | struct sockaddr *addr = p; | |
ffe1d49c SH |
169 | |
170 | if (!is_valid_ether_addr(addr->sa_data)) | |
171 | return -EINVAL; | |
4505a3ef SH |
172 | |
173 | spin_lock_bh(&br->lock); | |
ffe1d49c SH |
174 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
175 | br_stp_change_bridge_id(br, addr->sa_data); | |
92c0574f | 176 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
177 | spin_unlock_bh(&br->lock); |
178 | ||
ffe1d49c | 179 | return 0; |
4505a3ef SH |
180 | } |
181 | ||
edb5e46f SH |
182 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
183 | { | |
184 | strcpy(info->driver, "bridge"); | |
185 | strcpy(info->version, BR_VERSION); | |
186 | strcpy(info->fw_version, "N/A"); | |
187 | strcpy(info->bus_info, "N/A"); | |
188 | } | |
189 | ||
c4d27ef9 | 190 | static u32 br_fix_features(struct net_device *dev, u32 features) |
edb5e46f SH |
191 | { |
192 | struct net_bridge *br = netdev_priv(dev); | |
193 | ||
c4d27ef9 | 194 | return br_features_recompute(br, features); |
361ff8a6 JG |
195 | } |
196 | ||
c06ee961 | 197 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 198 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 199 | { |
c06ee961 WC |
200 | } |
201 | ||
91d2c34a | 202 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 203 | { |
91d2c34a HX |
204 | struct net_bridge *br = netdev_priv(dev); |
205 | struct net_bridge_port *p, *n; | |
c06ee961 | 206 | |
91d2c34a HX |
207 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
208 | br_netpoll_disable(p); | |
209 | } | |
c06ee961 WC |
210 | } |
211 | ||
91d2c34a | 212 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 213 | { |
cfb478da | 214 | struct net_bridge *br = netdev_priv(dev); |
c06ee961 | 215 | struct net_bridge_port *p, *n; |
91d2c34a | 216 | int err = 0; |
c06ee961 | 217 | |
c06ee961 | 218 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
91d2c34a HX |
219 | if (!p->dev) |
220 | continue; | |
221 | ||
222 | err = br_netpoll_enable(p); | |
223 | if (err) | |
224 | goto fail; | |
c06ee961 | 225 | } |
91d2c34a HX |
226 | |
227 | out: | |
228 | return err; | |
229 | ||
230 | fail: | |
231 | br_netpoll_cleanup(dev); | |
232 | goto out; | |
c06ee961 WC |
233 | } |
234 | ||
91d2c34a | 235 | int br_netpoll_enable(struct net_bridge_port *p) |
cfb478da | 236 | { |
91d2c34a HX |
237 | struct netpoll *np; |
238 | int err = 0; | |
239 | ||
240 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); | |
241 | err = -ENOMEM; | |
242 | if (!np) | |
243 | goto out; | |
244 | ||
245 | np->dev = p->dev; | |
cefa9993 | 246 | strlcpy(np->dev_name, p->dev->name, IFNAMSIZ); |
91d2c34a HX |
247 | |
248 | err = __netpoll_setup(np); | |
249 | if (err) { | |
250 | kfree(np); | |
251 | goto out; | |
252 | } | |
253 | ||
254 | p->np = np; | |
255 | ||
256 | out: | |
257 | return err; | |
cfb478da | 258 | } |
c06ee961 | 259 | |
91d2c34a | 260 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 261 | { |
91d2c34a HX |
262 | struct netpoll *np = p->np; |
263 | ||
264 | if (!np) | |
265 | return; | |
266 | ||
267 | p->np = NULL; | |
268 | ||
269 | /* Wait for transmitting packets to finish before freeing. */ | |
270 | synchronize_rcu_bh(); | |
271 | ||
272 | __netpoll_cleanup(np); | |
273 | kfree(np); | |
c06ee961 WC |
274 | } |
275 | ||
276 | #endif | |
277 | ||
afc6151a JP |
278 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
279 | ||
280 | { | |
281 | struct net_bridge *br = netdev_priv(dev); | |
282 | ||
283 | return br_add_if(br, slave_dev); | |
284 | } | |
285 | ||
286 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
287 | { | |
288 | struct net_bridge *br = netdev_priv(dev); | |
289 | ||
290 | return br_del_if(br, slave_dev); | |
291 | } | |
292 | ||
a2dbb882 | 293 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
294 | .get_drvinfo = br_getinfo, |
295 | .get_link = ethtool_op_get_link, | |
edb5e46f SH |
296 | }; |
297 | ||
a2dbb882 SH |
298 | static const struct net_device_ops br_netdev_ops = { |
299 | .ndo_open = br_dev_open, | |
300 | .ndo_stop = br_dev_stop, | |
bb900b27 | 301 | .ndo_init = br_dev_init, |
00829823 | 302 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 303 | .ndo_get_stats64 = br_get_stats64, |
00829823 SH |
304 | .ndo_set_mac_address = br_set_mac_address, |
305 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
306 | .ndo_change_mtu = br_change_mtu, | |
307 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 308 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 309 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
310 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
311 | .ndo_poll_controller = br_poll_controller, | |
312 | #endif | |
afc6151a JP |
313 | .ndo_add_slave = br_add_slave, |
314 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 315 | .ndo_fix_features = br_fix_features, |
a2dbb882 SH |
316 | }; |
317 | ||
14bb4789 | 318 | static void br_dev_free(struct net_device *dev) |
319 | { | |
320 | struct net_bridge *br = netdev_priv(dev); | |
321 | ||
322 | free_percpu(br->stats); | |
323 | free_netdev(dev); | |
324 | } | |
325 | ||
bb900b27 | 326 | static struct device_type br_type = { |
327 | .name = "bridge", | |
328 | }; | |
329 | ||
1da177e4 LT |
330 | void br_dev_setup(struct net_device *dev) |
331 | { | |
bb900b27 | 332 | struct net_bridge *br = netdev_priv(dev); |
333 | ||
3ae41254 | 334 | random_ether_addr(dev->dev_addr); |
1da177e4 LT |
335 | ether_setup(dev); |
336 | ||
a2dbb882 | 337 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 338 | dev->destructor = br_dev_free; |
9d6f229f | 339 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
bb900b27 | 340 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 341 | dev->tx_queue_len = 0; |
1da177e4 | 342 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 343 | |
9d6f229f | 344 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
4aa678ba | 345 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
c4d27ef9 MM |
346 | NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX; |
347 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | | |
348 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | | |
349 | NETIF_F_HW_VLAN_TX; | |
bb900b27 | 350 | |
351 | br->dev = dev; | |
352 | spin_lock_init(&br->lock); | |
353 | INIT_LIST_HEAD(&br->port_list); | |
354 | spin_lock_init(&br->hash_lock); | |
355 | ||
356 | br->bridge_id.prio[0] = 0x80; | |
357 | br->bridge_id.prio[1] = 0x00; | |
358 | ||
359 | memcpy(br->group_addr, br_group_address, ETH_ALEN); | |
360 | ||
bb900b27 | 361 | br->stp_enabled = BR_NO_STP; |
362 | br->designated_root = br->bridge_id; | |
363 | br->bridge_max_age = br->max_age = 20 * HZ; | |
364 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
365 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
366 | br->ageing_time = 300 * HZ; | |
367 | ||
368 | br_netfilter_rtable_init(br); | |
369 | br_stp_timer_init(br); | |
370 | br_multicast_init(br); | |
1da177e4 | 371 | } |