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Commit | Line | Data |
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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 | |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
1da177e4 LT |
23 | #include "br_private.h" |
24 | ||
161f65ba VY |
25 | #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \ |
26 | NETIF_F_GSO_MASK | NETIF_F_HW_CSUM) | |
27 | ||
1a4ba64d PNA |
28 | const struct nf_br_ops __rcu *nf_br_ops __read_mostly; |
29 | EXPORT_SYMBOL_GPL(nf_br_ops); | |
30 | ||
c6894dec NA |
31 | static struct lock_class_key bridge_netdev_addr_lock_key; |
32 | ||
eeaf61d8 | 33 | /* net device transmit always called with BH disabled */ |
6fef4c0c | 34 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
35 | { |
36 | struct net_bridge *br = netdev_priv(dev); | |
1da177e4 | 37 | struct net_bridge_fdb_entry *dst; |
c4fcb78c | 38 | struct net_bridge_mdb_entry *mdst; |
8f84985f | 39 | struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats); |
1a4ba64d | 40 | const struct nf_br_ops *nf_ops; |
31a4562d | 41 | const unsigned char *dest; |
78851988 | 42 | u16 vid = 0; |
1da177e4 | 43 | |
c03307ea | 44 | rcu_read_lock(); |
1a4ba64d PNA |
45 | nf_ops = rcu_dereference(nf_br_ops); |
46 | if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) { | |
c03307ea | 47 | rcu_read_unlock(); |
ea2d9b41 BDS |
48 | return NETDEV_TX_OK; |
49 | } | |
ea2d9b41 | 50 | |
406818ff | 51 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 52 | brstats->tx_packets++; |
53 | brstats->tx_bytes += skb->len; | |
406818ff | 54 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 55 | |
79e99bdd IS |
56 | #ifdef CONFIG_NET_SWITCHDEV |
57 | skb->offload_fwd_mark = 0; | |
58 | #endif | |
14bb4789 | 59 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 60 | |
459a98ed | 61 | skb_reset_mac_header(skb); |
1da177e4 LT |
62 | skb_pull(skb, ETH_HLEN); |
63 | ||
907b1e6e | 64 | if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid)) |
12464bb8 TM |
65 | goto out; |
66 | ||
31a4562d | 67 | dest = eth_hdr(skb)->h_dest; |
37b090e6 | 68 | if (is_broadcast_ether_addr(dest)) { |
8addd5e7 | 69 | br_flood(br, skb, BR_PKT_BROADCAST, false, true); |
37b090e6 | 70 | } else if (is_multicast_ether_addr(dest)) { |
91d2c34a | 71 | if (unlikely(netpoll_tx_running(dev))) { |
8addd5e7 | 72 | br_flood(br, skb, BR_PKT_MULTICAST, false, true); |
91d2c34a HX |
73 | goto out; |
74 | } | |
06499098 | 75 | if (br_multicast_rcv(br, NULL, skb, vid)) { |
6d1d1d39 | 76 | kfree_skb(skb); |
c4fcb78c | 77 | goto out; |
6d1d1d39 | 78 | } |
c4fcb78c | 79 | |
fbca58a2 | 80 | mdst = br_mdb_get(br, skb, vid); |
b00589af | 81 | if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) && |
cc0fdd80 | 82 | br_multicast_querier_exists(br, eth_hdr(skb))) |
37b090e6 | 83 | br_multicast_flood(mdst, skb, false, true); |
c4fcb78c | 84 | else |
8addd5e7 | 85 | br_flood(br, skb, BR_PKT_MULTICAST, false, true); |
bfd0aeac | 86 | } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) { |
37b090e6 NA |
87 | br_forward(dst->dst, skb, false, true); |
88 | } else { | |
8addd5e7 | 89 | br_flood(br, skb, BR_PKT_UNICAST, false, true); |
37b090e6 | 90 | } |
c4fcb78c | 91 | out: |
eeaf61d8 | 92 | rcu_read_unlock(); |
6ed10654 | 93 | return NETDEV_TX_OK; |
1da177e4 LT |
94 | } |
95 | ||
c6894dec NA |
96 | static void br_set_lockdep_class(struct net_device *dev) |
97 | { | |
98 | lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key); | |
99 | } | |
100 | ||
bb900b27 | 101 | static int br_dev_init(struct net_device *dev) |
102 | { | |
103 | struct net_bridge *br = netdev_priv(dev); | |
5be5a2df | 104 | int err; |
bb900b27 | 105 | |
1c213bd2 | 106 | br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
bb900b27 | 107 | if (!br->stats) |
108 | return -ENOMEM; | |
109 | ||
5be5a2df | 110 | err = br_vlan_init(br); |
1080ab95 | 111 | if (err) { |
5be5a2df | 112 | free_percpu(br->stats); |
1080ab95 NA |
113 | return err; |
114 | } | |
115 | ||
116 | err = br_multicast_init_stats(br); | |
117 | if (err) { | |
118 | free_percpu(br->stats); | |
119 | br_vlan_flush(br); | |
120 | } | |
c6894dec | 121 | br_set_lockdep_class(dev); |
5be5a2df VY |
122 | |
123 | return err; | |
bb900b27 | 124 | } |
125 | ||
b6fe0440 IS |
126 | static void br_dev_uninit(struct net_device *dev) |
127 | { | |
128 | struct net_bridge *br = netdev_priv(dev); | |
129 | ||
b1b9d366 | 130 | br_multicast_dev_del(br); |
b6fe0440 IS |
131 | br_multicast_uninit_stats(br); |
132 | br_vlan_flush(br); | |
133 | free_percpu(br->stats); | |
134 | } | |
135 | ||
1da177e4 LT |
136 | static int br_dev_open(struct net_device *dev) |
137 | { | |
81d35307 | 138 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 139 | |
c4d27ef9 | 140 | netdev_update_features(dev); |
81d35307 SH |
141 | netif_start_queue(dev); |
142 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 143 | br_multicast_open(br); |
1da177e4 LT |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static void br_dev_set_multicast_list(struct net_device *dev) | |
149 | { | |
150 | } | |
151 | ||
2796d0c6 VY |
152 | static void br_dev_change_rx_flags(struct net_device *dev, int change) |
153 | { | |
154 | if (change & IFF_PROMISC) | |
155 | br_manage_promisc(netdev_priv(dev)); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | static int br_dev_stop(struct net_device *dev) |
159 | { | |
3fe2d7c7 HX |
160 | struct net_bridge *br = netdev_priv(dev); |
161 | ||
162 | br_stp_disable_bridge(br); | |
163 | br_multicast_stop(br); | |
1da177e4 LT |
164 | |
165 | netif_stop_queue(dev); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
bc1f4470 | 170 | static void br_get_stats64(struct net_device *dev, |
171 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 172 | { |
173 | struct net_bridge *br = netdev_priv(dev); | |
8f84985f | 174 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
14bb4789 | 175 | unsigned int cpu; |
176 | ||
177 | for_each_possible_cpu(cpu) { | |
406818ff | 178 | unsigned int start; |
8f84985f | 179 | const struct pcpu_sw_netstats *bstats |
14bb4789 | 180 | = per_cpu_ptr(br->stats, cpu); |
406818ff | 181 | do { |
57a7744e | 182 | start = u64_stats_fetch_begin_irq(&bstats->syncp); |
406818ff | 183 | memcpy(&tmp, bstats, sizeof(tmp)); |
57a7744e | 184 | } while (u64_stats_fetch_retry_irq(&bstats->syncp, start)); |
406818ff ED |
185 | sum.tx_bytes += tmp.tx_bytes; |
186 | sum.tx_packets += tmp.tx_packets; | |
187 | sum.rx_bytes += tmp.rx_bytes; | |
188 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 189 | } |
190 | ||
191 | stats->tx_bytes = sum.tx_bytes; | |
192 | stats->tx_packets = sum.tx_packets; | |
193 | stats->rx_bytes = sum.rx_bytes; | |
194 | stats->rx_packets = sum.rx_packets; | |
14bb4789 | 195 | } |
196 | ||
1da177e4 LT |
197 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
198 | { | |
4adf0af6 | 199 | struct net_bridge *br = netdev_priv(dev); |
91572088 | 200 | if (new_mtu > br_min_mtu(br)) |
1da177e4 LT |
201 | return -EINVAL; |
202 | ||
203 | dev->mtu = new_mtu; | |
4adf0af6 | 204 | |
34666d46 | 205 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
4adf0af6 | 206 | /* remember the MTU in the rtable for PMTU */ |
defb3519 | 207 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
208 | #endif |
209 | ||
1da177e4 LT |
210 | return 0; |
211 | } | |
212 | ||
ffe1d49c | 213 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
214 | static int br_set_mac_address(struct net_device *dev, void *p) |
215 | { | |
216 | struct net_bridge *br = netdev_priv(dev); | |
217 | struct sockaddr *addr = p; | |
ffe1d49c SH |
218 | |
219 | if (!is_valid_ether_addr(addr->sa_data)) | |
7ca1e11a | 220 | return -EADDRNOTAVAIL; |
4505a3ef SH |
221 | |
222 | spin_lock_bh(&br->lock); | |
9a7b6ef9 | 223 | if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) { |
a3ebb7ef | 224 | /* Mac address will be changed in br_stp_change_bridge_id(). */ |
43598813 | 225 | br_stp_change_bridge_id(br, addr->sa_data); |
226 | } | |
4505a3ef SH |
227 | spin_unlock_bh(&br->lock); |
228 | ||
ffe1d49c | 229 | return 0; |
4505a3ef SH |
230 | } |
231 | ||
edb5e46f SH |
232 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
233 | { | |
7826d43f JP |
234 | strlcpy(info->driver, "bridge", sizeof(info->driver)); |
235 | strlcpy(info->version, BR_VERSION, sizeof(info->version)); | |
236 | strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); | |
237 | strlcpy(info->bus_info, "N/A", sizeof(info->bus_info)); | |
edb5e46f SH |
238 | } |
239 | ||
c8f44aff MM |
240 | static netdev_features_t br_fix_features(struct net_device *dev, |
241 | netdev_features_t features) | |
edb5e46f SH |
242 | { |
243 | struct net_bridge *br = netdev_priv(dev); | |
244 | ||
c4d27ef9 | 245 | return br_features_recompute(br, features); |
361ff8a6 JG |
246 | } |
247 | ||
c06ee961 | 248 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 249 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 250 | { |
c06ee961 WC |
251 | } |
252 | ||
91d2c34a | 253 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 254 | { |
91d2c34a | 255 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 256 | struct net_bridge_port *p; |
c06ee961 | 257 | |
4e3828c4 | 258 | list_for_each_entry(p, &br->port_list, list) |
91d2c34a | 259 | br_netpoll_disable(p); |
c06ee961 WC |
260 | } |
261 | ||
a8779ec1 | 262 | static int __br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
263 | { |
264 | struct netpoll *np; | |
265 | int err; | |
266 | ||
a8779ec1 | 267 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); |
dbe17307 CW |
268 | if (!np) |
269 | return -ENOMEM; | |
270 | ||
a8779ec1 | 271 | err = __netpoll_setup(np, p->dev); |
dbe17307 CW |
272 | if (err) { |
273 | kfree(np); | |
274 | return err; | |
275 | } | |
276 | ||
277 | p->np = np; | |
278 | return err; | |
279 | } | |
280 | ||
a8779ec1 | 281 | int br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
282 | { |
283 | if (!p->br->dev->npinfo) | |
284 | return 0; | |
285 | ||
a8779ec1 | 286 | return __br_netpoll_enable(p); |
dbe17307 CW |
287 | } |
288 | ||
a8779ec1 | 289 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 290 | { |
cfb478da | 291 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 292 | struct net_bridge_port *p; |
91d2c34a | 293 | int err = 0; |
c06ee961 | 294 | |
4e3828c4 | 295 | list_for_each_entry(p, &br->port_list, list) { |
91d2c34a HX |
296 | if (!p->dev) |
297 | continue; | |
a8779ec1 | 298 | err = __br_netpoll_enable(p); |
91d2c34a HX |
299 | if (err) |
300 | goto fail; | |
c06ee961 | 301 | } |
91d2c34a HX |
302 | |
303 | out: | |
304 | return err; | |
305 | ||
306 | fail: | |
307 | br_netpoll_cleanup(dev); | |
308 | goto out; | |
c06ee961 WC |
309 | } |
310 | ||
91d2c34a | 311 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 312 | { |
91d2c34a HX |
313 | struct netpoll *np = p->np; |
314 | ||
315 | if (!np) | |
316 | return; | |
317 | ||
318 | p->np = NULL; | |
319 | ||
2cde6acd | 320 | __netpoll_free_async(np); |
c06ee961 WC |
321 | } |
322 | ||
323 | #endif | |
324 | ||
afc6151a JP |
325 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
326 | ||
327 | { | |
328 | struct net_bridge *br = netdev_priv(dev); | |
329 | ||
330 | return br_add_if(br, slave_dev); | |
331 | } | |
332 | ||
333 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
334 | { | |
335 | struct net_bridge *br = netdev_priv(dev); | |
336 | ||
337 | return br_del_if(br, slave_dev); | |
338 | } | |
339 | ||
a2dbb882 | 340 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
341 | .get_drvinfo = br_getinfo, |
342 | .get_link = ethtool_op_get_link, | |
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, |
b6fe0440 | 349 | .ndo_uninit = br_dev_uninit, |
00829823 | 350 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 351 | .ndo_get_stats64 = br_get_stats64, |
00829823 | 352 | .ndo_set_mac_address = br_set_mac_address, |
afc4b13d | 353 | .ndo_set_rx_mode = br_dev_set_multicast_list, |
2796d0c6 | 354 | .ndo_change_rx_flags = br_dev_change_rx_flags, |
00829823 SH |
355 | .ndo_change_mtu = br_change_mtu, |
356 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 357 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 358 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
359 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
360 | .ndo_poll_controller = br_poll_controller, | |
361 | #endif | |
afc6151a JP |
362 | .ndo_add_slave = br_add_slave, |
363 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 364 | .ndo_fix_features = br_fix_features, |
77162022 JF |
365 | .ndo_fdb_add = br_fdb_add, |
366 | .ndo_fdb_del = br_fdb_delete, | |
367 | .ndo_fdb_dump = br_fdb_dump, | |
e5a55a89 JF |
368 | .ndo_bridge_getlink = br_getlink, |
369 | .ndo_bridge_setlink = br_setlink, | |
407af329 | 370 | .ndo_bridge_dellink = br_dellink, |
66780530 | 371 | .ndo_features_check = passthru_features_check, |
a2dbb882 SH |
372 | }; |
373 | ||
bb900b27 | 374 | static struct device_type br_type = { |
375 | .name = "bridge", | |
376 | }; | |
377 | ||
1da177e4 LT |
378 | void br_dev_setup(struct net_device *dev) |
379 | { | |
bb900b27 | 380 | struct net_bridge *br = netdev_priv(dev); |
381 | ||
7ce5d222 | 382 | eth_hw_addr_random(dev); |
1da177e4 LT |
383 | ether_setup(dev); |
384 | ||
a2dbb882 | 385 | dev->netdev_ops = &br_netdev_ops; |
cf124db5 | 386 | dev->needs_free_netdev = true; |
7ad24ea4 | 387 | dev->ethtool_ops = &br_ethtool_ops; |
bb900b27 | 388 | SET_NETDEV_DEVTYPE(dev, &br_type); |
ccecb2a4 | 389 | dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE; |
edb5e46f | 390 | |
161f65ba | 391 | dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | |
1c5abb6c TM |
392 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; |
393 | dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | | |
394 | NETIF_F_HW_VLAN_STAG_TX; | |
161f65ba | 395 | dev->vlan_features = COMMON_FEATURES; |
bb900b27 | 396 | |
397 | br->dev = dev; | |
398 | spin_lock_init(&br->lock); | |
399 | INIT_LIST_HEAD(&br->port_list); | |
400 | spin_lock_init(&br->hash_lock); | |
401 | ||
402 | br->bridge_id.prio[0] = 0x80; | |
403 | br->bridge_id.prio[1] = 0x00; | |
404 | ||
e5a727f6 | 405 | ether_addr_copy(br->group_addr, eth_reserved_addr_base); |
bb900b27 | 406 | |
bb900b27 | 407 | br->stp_enabled = BR_NO_STP; |
515853cc | 408 | br->group_fwd_mask = BR_GROUPFWD_DEFAULT; |
f2808d22 | 409 | br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; |
515853cc | 410 | |
bb900b27 | 411 | br->designated_root = br->bridge_id; |
412 | br->bridge_max_age = br->max_age = 20 * HZ; | |
413 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
414 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
34d8acd8 | 415 | br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME; |
91572088 | 416 | dev->max_mtu = ETH_MAX_MTU; |
bb900b27 | 417 | |
418 | br_netfilter_rtable_init(br); | |
419 | br_stp_timer_init(br); | |
420 | br_multicast_init(br); | |
f7cdee8a | 421 | INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup); |
1da177e4 | 422 | } |