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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 | |
c03307ea | 34 | rcu_read_lock(); |
ea2d9b41 BDS |
35 | #ifdef CONFIG_BRIDGE_NETFILTER |
36 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { | |
37 | br_nf_pre_routing_finish_bridge_slow(skb); | |
c03307ea | 38 | rcu_read_unlock(); |
ea2d9b41 BDS |
39 | return NETDEV_TX_OK; |
40 | } | |
41 | #endif | |
42 | ||
406818ff | 43 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 44 | brstats->tx_packets++; |
45 | brstats->tx_bytes += skb->len; | |
406818ff | 46 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 47 | |
14bb4789 | 48 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 49 | |
459a98ed | 50 | skb_reset_mac_header(skb); |
1da177e4 LT |
51 | skb_pull(skb, ETH_HLEN); |
52 | ||
44661462 HX |
53 | if (is_broadcast_ether_addr(dest)) |
54 | br_flood_deliver(br, skb); | |
55 | else if (is_multicast_ether_addr(dest)) { | |
91d2c34a HX |
56 | if (unlikely(netpoll_tx_running(dev))) { |
57 | br_flood_deliver(br, skb); | |
58 | goto out; | |
59 | } | |
6d1d1d39 HX |
60 | if (br_multicast_rcv(br, NULL, skb)) { |
61 | kfree_skb(skb); | |
c4fcb78c | 62 | goto out; |
6d1d1d39 | 63 | } |
c4fcb78c HX |
64 | |
65 | mdst = br_mdb_get(br, skb); | |
32dec5dd | 66 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
c4fcb78c HX |
67 | br_multicast_deliver(mdst, skb); |
68 | else | |
69 | br_flood_deliver(br, skb); | |
70 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
1da177e4 LT |
71 | br_deliver(dst->dst, skb); |
72 | else | |
e081e1e3 | 73 | br_flood_deliver(br, skb); |
1da177e4 | 74 | |
c4fcb78c | 75 | out: |
eeaf61d8 | 76 | rcu_read_unlock(); |
6ed10654 | 77 | return NETDEV_TX_OK; |
1da177e4 LT |
78 | } |
79 | ||
bb900b27 | 80 | static int br_dev_init(struct net_device *dev) |
81 | { | |
82 | struct net_bridge *br = netdev_priv(dev); | |
83 | ||
84 | br->stats = alloc_percpu(struct br_cpu_netstats); | |
85 | if (!br->stats) | |
86 | return -ENOMEM; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
1da177e4 LT |
91 | static int br_dev_open(struct net_device *dev) |
92 | { | |
81d35307 | 93 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 94 | |
c4d27ef9 | 95 | netdev_update_features(dev); |
81d35307 SH |
96 | netif_start_queue(dev); |
97 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 98 | br_multicast_open(br); |
1da177e4 LT |
99 | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static void br_dev_set_multicast_list(struct net_device *dev) | |
104 | { | |
105 | } | |
106 | ||
107 | static int br_dev_stop(struct net_device *dev) | |
108 | { | |
3fe2d7c7 HX |
109 | struct net_bridge *br = netdev_priv(dev); |
110 | ||
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 | 130 | do { |
e3906486 | 131 | start = u64_stats_fetch_begin_bh(&bstats->syncp); |
406818ff | 132 | memcpy(&tmp, bstats, sizeof(tmp)); |
e3906486 | 133 | } while (u64_stats_fetch_retry_bh(&bstats->syncp, start)); |
406818ff ED |
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)) | |
7ca1e11a | 171 | return -EADDRNOTAVAIL; |
4505a3ef SH |
172 | |
173 | spin_lock_bh(&br->lock); | |
9a7b6ef9 | 174 | if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) { |
43598813 | 175 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
176 | br_fdb_change_mac_address(br, addr->sa_data); | |
177 | br_stp_change_bridge_id(br, addr->sa_data); | |
178 | } | |
92c0574f | 179 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
180 | spin_unlock_bh(&br->lock); |
181 | ||
ffe1d49c | 182 | return 0; |
4505a3ef SH |
183 | } |
184 | ||
edb5e46f SH |
185 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
186 | { | |
187 | strcpy(info->driver, "bridge"); | |
188 | strcpy(info->version, BR_VERSION); | |
189 | strcpy(info->fw_version, "N/A"); | |
190 | strcpy(info->bus_info, "N/A"); | |
191 | } | |
192 | ||
c8f44aff MM |
193 | static netdev_features_t br_fix_features(struct net_device *dev, |
194 | netdev_features_t features) | |
edb5e46f SH |
195 | { |
196 | struct net_bridge *br = netdev_priv(dev); | |
197 | ||
c4d27ef9 | 198 | return br_features_recompute(br, features); |
361ff8a6 JG |
199 | } |
200 | ||
c06ee961 | 201 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 202 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 203 | { |
c06ee961 WC |
204 | } |
205 | ||
91d2c34a | 206 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 207 | { |
91d2c34a | 208 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 209 | struct net_bridge_port *p; |
c06ee961 | 210 | |
4e3828c4 | 211 | list_for_each_entry(p, &br->port_list, list) |
91d2c34a | 212 | br_netpoll_disable(p); |
c06ee961 WC |
213 | } |
214 | ||
47be03a2 AW |
215 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, |
216 | gfp_t gfp) | |
c06ee961 | 217 | { |
cfb478da | 218 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 219 | struct net_bridge_port *p; |
91d2c34a | 220 | int err = 0; |
c06ee961 | 221 | |
4e3828c4 | 222 | list_for_each_entry(p, &br->port_list, list) { |
91d2c34a HX |
223 | if (!p->dev) |
224 | continue; | |
47be03a2 | 225 | err = br_netpoll_enable(p, gfp); |
91d2c34a HX |
226 | if (err) |
227 | goto fail; | |
c06ee961 | 228 | } |
91d2c34a HX |
229 | |
230 | out: | |
231 | return err; | |
232 | ||
233 | fail: | |
234 | br_netpoll_cleanup(dev); | |
235 | goto out; | |
c06ee961 WC |
236 | } |
237 | ||
47be03a2 | 238 | int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp) |
cfb478da | 239 | { |
91d2c34a HX |
240 | struct netpoll *np; |
241 | int err = 0; | |
242 | ||
47be03a2 | 243 | np = kzalloc(sizeof(*p->np), gfp); |
91d2c34a HX |
244 | err = -ENOMEM; |
245 | if (!np) | |
246 | goto out; | |
247 | ||
47be03a2 | 248 | err = __netpoll_setup(np, p->dev, gfp); |
91d2c34a HX |
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 | ||
38e6bc18 | 269 | __netpoll_free_rcu(np); |
c06ee961 WC |
270 | } |
271 | ||
272 | #endif | |
273 | ||
afc6151a JP |
274 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
275 | ||
276 | { | |
277 | struct net_bridge *br = netdev_priv(dev); | |
278 | ||
279 | return br_add_if(br, slave_dev); | |
280 | } | |
281 | ||
282 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
283 | { | |
284 | struct net_bridge *br = netdev_priv(dev); | |
285 | ||
286 | return br_del_if(br, slave_dev); | |
287 | } | |
288 | ||
a2dbb882 | 289 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
290 | .get_drvinfo = br_getinfo, |
291 | .get_link = ethtool_op_get_link, | |
edb5e46f SH |
292 | }; |
293 | ||
a2dbb882 SH |
294 | static const struct net_device_ops br_netdev_ops = { |
295 | .ndo_open = br_dev_open, | |
296 | .ndo_stop = br_dev_stop, | |
bb900b27 | 297 | .ndo_init = br_dev_init, |
00829823 | 298 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 299 | .ndo_get_stats64 = br_get_stats64, |
00829823 | 300 | .ndo_set_mac_address = br_set_mac_address, |
afc4b13d | 301 | .ndo_set_rx_mode = br_dev_set_multicast_list, |
00829823 SH |
302 | .ndo_change_mtu = br_change_mtu, |
303 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 304 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 305 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
306 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
307 | .ndo_poll_controller = br_poll_controller, | |
308 | #endif | |
afc6151a JP |
309 | .ndo_add_slave = br_add_slave, |
310 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 311 | .ndo_fix_features = br_fix_features, |
77162022 JF |
312 | .ndo_fdb_add = br_fdb_add, |
313 | .ndo_fdb_del = br_fdb_delete, | |
314 | .ndo_fdb_dump = br_fdb_dump, | |
e5a55a89 JF |
315 | .ndo_bridge_getlink = br_getlink, |
316 | .ndo_bridge_setlink = br_setlink, | |
a2dbb882 SH |
317 | }; |
318 | ||
14bb4789 | 319 | static void br_dev_free(struct net_device *dev) |
320 | { | |
321 | struct net_bridge *br = netdev_priv(dev); | |
322 | ||
323 | free_percpu(br->stats); | |
324 | free_netdev(dev); | |
325 | } | |
326 | ||
bb900b27 | 327 | static struct device_type br_type = { |
328 | .name = "bridge", | |
329 | }; | |
330 | ||
1da177e4 LT |
331 | void br_dev_setup(struct net_device *dev) |
332 | { | |
bb900b27 | 333 | struct net_bridge *br = netdev_priv(dev); |
334 | ||
7ce5d222 | 335 | eth_hw_addr_random(dev); |
1da177e4 LT |
336 | ether_setup(dev); |
337 | ||
a2dbb882 | 338 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 339 | dev->destructor = br_dev_free; |
9d6f229f | 340 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
bb900b27 | 341 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 342 | dev->tx_queue_len = 0; |
1da177e4 | 343 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 344 | |
9d6f229f | 345 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
34324dc2 | 346 | NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX | |
c4d27ef9 MM |
347 | NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX; |
348 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | | |
34324dc2 | 349 | NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | |
c4d27ef9 | 350 | NETIF_F_HW_VLAN_TX; |
bb900b27 | 351 | |
352 | br->dev = dev; | |
353 | spin_lock_init(&br->lock); | |
354 | INIT_LIST_HEAD(&br->port_list); | |
355 | spin_lock_init(&br->hash_lock); | |
356 | ||
357 | br->bridge_id.prio[0] = 0x80; | |
358 | br->bridge_id.prio[1] = 0x00; | |
359 | ||
2bc80059 | 360 | memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN); |
bb900b27 | 361 | |
bb900b27 | 362 | br->stp_enabled = BR_NO_STP; |
515853cc | 363 | br->group_fwd_mask = BR_GROUPFWD_DEFAULT; |
364 | ||
bb900b27 | 365 | br->designated_root = br->bridge_id; |
366 | br->bridge_max_age = br->max_age = 20 * HZ; | |
367 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
368 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
369 | br->ageing_time = 300 * HZ; | |
370 | ||
371 | br_netfilter_rtable_init(br); | |
372 | br_stp_timer_init(br); | |
373 | br_multicast_init(br); | |
1da177e4 | 374 | } |