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 | ||
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 | ||
eeaf61d8 | 28 | /* net device transmit always called with BH disabled */ |
6fef4c0c | 29 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
30 | { |
31 | struct net_bridge *br = netdev_priv(dev); | |
32 | const unsigned char *dest = skb->data; | |
33 | struct net_bridge_fdb_entry *dst; | |
c4fcb78c | 34 | struct net_bridge_mdb_entry *mdst; |
8f84985f | 35 | struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats); |
78851988 | 36 | u16 vid = 0; |
1da177e4 | 37 | |
c03307ea | 38 | rcu_read_lock(); |
ea2d9b41 BDS |
39 | #ifdef CONFIG_BRIDGE_NETFILTER |
40 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { | |
41 | br_nf_pre_routing_finish_bridge_slow(skb); | |
c03307ea | 42 | rcu_read_unlock(); |
ea2d9b41 BDS |
43 | return NETDEV_TX_OK; |
44 | } | |
45 | #endif | |
46 | ||
406818ff | 47 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 48 | brstats->tx_packets++; |
49 | brstats->tx_bytes += skb->len; | |
406818ff | 50 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 51 | |
14bb4789 | 52 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 53 | |
459a98ed | 54 | skb_reset_mac_header(skb); |
1da177e4 LT |
55 | skb_pull(skb, ETH_HLEN); |
56 | ||
12464bb8 TM |
57 | if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid)) |
58 | goto out; | |
59 | ||
44661462 | 60 | if (is_broadcast_ether_addr(dest)) |
867a5943 | 61 | br_flood_deliver(br, skb, false); |
44661462 | 62 | else if (is_multicast_ether_addr(dest)) { |
91d2c34a | 63 | if (unlikely(netpoll_tx_running(dev))) { |
867a5943 | 64 | br_flood_deliver(br, skb, false); |
91d2c34a HX |
65 | goto out; |
66 | } | |
06499098 | 67 | if (br_multicast_rcv(br, NULL, skb, vid)) { |
6d1d1d39 | 68 | kfree_skb(skb); |
c4fcb78c | 69 | goto out; |
6d1d1d39 | 70 | } |
c4fcb78c | 71 | |
fbca58a2 | 72 | mdst = br_mdb_get(br, skb, vid); |
b00589af | 73 | if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) && |
cc0fdd80 | 74 | br_multicast_querier_exists(br, eth_hdr(skb))) |
c4fcb78c HX |
75 | br_multicast_deliver(mdst, skb); |
76 | else | |
867a5943 | 77 | br_flood_deliver(br, skb, false); |
2ba071ec | 78 | } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) |
1da177e4 LT |
79 | br_deliver(dst->dst, skb); |
80 | else | |
867a5943 | 81 | br_flood_deliver(br, skb, true); |
1da177e4 | 82 | |
c4fcb78c | 83 | out: |
eeaf61d8 | 84 | rcu_read_unlock(); |
6ed10654 | 85 | return NETDEV_TX_OK; |
1da177e4 LT |
86 | } |
87 | ||
bb900b27 | 88 | static int br_dev_init(struct net_device *dev) |
89 | { | |
90 | struct net_bridge *br = netdev_priv(dev); | |
91 | ||
1c213bd2 | 92 | br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
bb900b27 | 93 | if (!br->stats) |
94 | return -ENOMEM; | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
1da177e4 LT |
99 | static int br_dev_open(struct net_device *dev) |
100 | { | |
81d35307 | 101 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 102 | |
c4d27ef9 | 103 | netdev_update_features(dev); |
81d35307 SH |
104 | netif_start_queue(dev); |
105 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 106 | br_multicast_open(br); |
1da177e4 LT |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static void br_dev_set_multicast_list(struct net_device *dev) | |
112 | { | |
113 | } | |
114 | ||
115 | static int br_dev_stop(struct net_device *dev) | |
116 | { | |
3fe2d7c7 HX |
117 | struct net_bridge *br = netdev_priv(dev); |
118 | ||
119 | br_stp_disable_bridge(br); | |
120 | br_multicast_stop(br); | |
1da177e4 LT |
121 | |
122 | netif_stop_queue(dev); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
28172739 ED |
127 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
128 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 129 | { |
130 | struct net_bridge *br = netdev_priv(dev); | |
8f84985f | 131 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
14bb4789 | 132 | unsigned int cpu; |
133 | ||
134 | for_each_possible_cpu(cpu) { | |
406818ff | 135 | unsigned int start; |
8f84985f | 136 | const struct pcpu_sw_netstats *bstats |
14bb4789 | 137 | = per_cpu_ptr(br->stats, cpu); |
406818ff | 138 | do { |
57a7744e | 139 | start = u64_stats_fetch_begin_irq(&bstats->syncp); |
406818ff | 140 | memcpy(&tmp, bstats, sizeof(tmp)); |
57a7744e | 141 | } while (u64_stats_fetch_retry_irq(&bstats->syncp, start)); |
406818ff ED |
142 | sum.tx_bytes += tmp.tx_bytes; |
143 | sum.tx_packets += tmp.tx_packets; | |
144 | sum.rx_bytes += tmp.rx_bytes; | |
145 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 146 | } |
147 | ||
148 | stats->tx_bytes = sum.tx_bytes; | |
149 | stats->tx_packets = sum.tx_packets; | |
150 | stats->rx_bytes = sum.rx_bytes; | |
151 | stats->rx_packets = sum.rx_packets; | |
152 | ||
153 | return stats; | |
154 | } | |
155 | ||
1da177e4 LT |
156 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
157 | { | |
4adf0af6 SW |
158 | struct net_bridge *br = netdev_priv(dev); |
159 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
160 | return -EINVAL; |
161 | ||
162 | dev->mtu = new_mtu; | |
4adf0af6 SW |
163 | |
164 | #ifdef CONFIG_BRIDGE_NETFILTER | |
165 | /* remember the MTU in the rtable for PMTU */ | |
defb3519 | 166 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
167 | #endif |
168 | ||
1da177e4 LT |
169 | return 0; |
170 | } | |
171 | ||
ffe1d49c | 172 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
173 | static int br_set_mac_address(struct net_device *dev, void *p) |
174 | { | |
175 | struct net_bridge *br = netdev_priv(dev); | |
176 | struct sockaddr *addr = p; | |
ffe1d49c SH |
177 | |
178 | if (!is_valid_ether_addr(addr->sa_data)) | |
7ca1e11a | 179 | return -EADDRNOTAVAIL; |
4505a3ef SH |
180 | |
181 | spin_lock_bh(&br->lock); | |
9a7b6ef9 | 182 | if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) { |
a3ebb7ef | 183 | /* Mac address will be changed in br_stp_change_bridge_id(). */ |
43598813 | 184 | br_stp_change_bridge_id(br, addr->sa_data); |
185 | } | |
4505a3ef SH |
186 | spin_unlock_bh(&br->lock); |
187 | ||
ffe1d49c | 188 | return 0; |
4505a3ef SH |
189 | } |
190 | ||
edb5e46f SH |
191 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
192 | { | |
7826d43f JP |
193 | strlcpy(info->driver, "bridge", sizeof(info->driver)); |
194 | strlcpy(info->version, BR_VERSION, sizeof(info->version)); | |
195 | strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); | |
196 | strlcpy(info->bus_info, "N/A", sizeof(info->bus_info)); | |
edb5e46f SH |
197 | } |
198 | ||
c8f44aff MM |
199 | static netdev_features_t br_fix_features(struct net_device *dev, |
200 | netdev_features_t features) | |
edb5e46f SH |
201 | { |
202 | struct net_bridge *br = netdev_priv(dev); | |
203 | ||
c4d27ef9 | 204 | return br_features_recompute(br, features); |
361ff8a6 JG |
205 | } |
206 | ||
c06ee961 | 207 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 208 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 209 | { |
c06ee961 WC |
210 | } |
211 | ||
91d2c34a | 212 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 213 | { |
91d2c34a | 214 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 215 | struct net_bridge_port *p; |
c06ee961 | 216 | |
4e3828c4 | 217 | list_for_each_entry(p, &br->port_list, list) |
91d2c34a | 218 | br_netpoll_disable(p); |
c06ee961 WC |
219 | } |
220 | ||
a8779ec1 | 221 | static int __br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
222 | { |
223 | struct netpoll *np; | |
224 | int err; | |
225 | ||
a8779ec1 | 226 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); |
dbe17307 CW |
227 | if (!np) |
228 | return -ENOMEM; | |
229 | ||
a8779ec1 | 230 | err = __netpoll_setup(np, p->dev); |
dbe17307 CW |
231 | if (err) { |
232 | kfree(np); | |
233 | return err; | |
234 | } | |
235 | ||
236 | p->np = np; | |
237 | return err; | |
238 | } | |
239 | ||
a8779ec1 | 240 | int br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
241 | { |
242 | if (!p->br->dev->npinfo) | |
243 | return 0; | |
244 | ||
a8779ec1 | 245 | return __br_netpoll_enable(p); |
dbe17307 CW |
246 | } |
247 | ||
a8779ec1 | 248 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 249 | { |
cfb478da | 250 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 251 | struct net_bridge_port *p; |
91d2c34a | 252 | int err = 0; |
c06ee961 | 253 | |
4e3828c4 | 254 | list_for_each_entry(p, &br->port_list, list) { |
91d2c34a HX |
255 | if (!p->dev) |
256 | continue; | |
a8779ec1 | 257 | err = __br_netpoll_enable(p); |
91d2c34a HX |
258 | if (err) |
259 | goto fail; | |
c06ee961 | 260 | } |
91d2c34a HX |
261 | |
262 | out: | |
263 | return err; | |
264 | ||
265 | fail: | |
266 | br_netpoll_cleanup(dev); | |
267 | goto out; | |
c06ee961 WC |
268 | } |
269 | ||
91d2c34a | 270 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 271 | { |
91d2c34a HX |
272 | struct netpoll *np = p->np; |
273 | ||
274 | if (!np) | |
275 | return; | |
276 | ||
277 | p->np = NULL; | |
278 | ||
2cde6acd | 279 | __netpoll_free_async(np); |
c06ee961 WC |
280 | } |
281 | ||
282 | #endif | |
283 | ||
afc6151a JP |
284 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
285 | ||
286 | { | |
287 | struct net_bridge *br = netdev_priv(dev); | |
288 | ||
289 | return br_add_if(br, slave_dev); | |
290 | } | |
291 | ||
292 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
293 | { | |
294 | struct net_bridge *br = netdev_priv(dev); | |
295 | ||
296 | return br_del_if(br, slave_dev); | |
297 | } | |
298 | ||
a2dbb882 | 299 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
300 | .get_drvinfo = br_getinfo, |
301 | .get_link = ethtool_op_get_link, | |
edb5e46f SH |
302 | }; |
303 | ||
a2dbb882 SH |
304 | static const struct net_device_ops br_netdev_ops = { |
305 | .ndo_open = br_dev_open, | |
306 | .ndo_stop = br_dev_stop, | |
bb900b27 | 307 | .ndo_init = br_dev_init, |
00829823 | 308 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 309 | .ndo_get_stats64 = br_get_stats64, |
00829823 | 310 | .ndo_set_mac_address = br_set_mac_address, |
afc4b13d | 311 | .ndo_set_rx_mode = br_dev_set_multicast_list, |
00829823 SH |
312 | .ndo_change_mtu = br_change_mtu, |
313 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 314 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 315 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
316 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
317 | .ndo_poll_controller = br_poll_controller, | |
318 | #endif | |
afc6151a JP |
319 | .ndo_add_slave = br_add_slave, |
320 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 321 | .ndo_fix_features = br_fix_features, |
77162022 JF |
322 | .ndo_fdb_add = br_fdb_add, |
323 | .ndo_fdb_del = br_fdb_delete, | |
324 | .ndo_fdb_dump = br_fdb_dump, | |
e5a55a89 JF |
325 | .ndo_bridge_getlink = br_getlink, |
326 | .ndo_bridge_setlink = br_setlink, | |
407af329 | 327 | .ndo_bridge_dellink = br_dellink, |
a2dbb882 SH |
328 | }; |
329 | ||
14bb4789 | 330 | static void br_dev_free(struct net_device *dev) |
331 | { | |
332 | struct net_bridge *br = netdev_priv(dev); | |
333 | ||
334 | free_percpu(br->stats); | |
335 | free_netdev(dev); | |
336 | } | |
337 | ||
bb900b27 | 338 | static struct device_type br_type = { |
339 | .name = "bridge", | |
340 | }; | |
341 | ||
1da177e4 LT |
342 | void br_dev_setup(struct net_device *dev) |
343 | { | |
bb900b27 | 344 | struct net_bridge *br = netdev_priv(dev); |
345 | ||
7ce5d222 | 346 | eth_hw_addr_random(dev); |
1da177e4 LT |
347 | ether_setup(dev); |
348 | ||
a2dbb882 | 349 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 350 | dev->destructor = br_dev_free; |
9d6f229f | 351 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
bb900b27 | 352 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 353 | dev->tx_queue_len = 0; |
1da177e4 | 354 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 355 | |
161f65ba VY |
356 | dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | |
357 | NETIF_F_HW_VLAN_CTAG_TX; | |
358 | dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX; | |
359 | dev->vlan_features = COMMON_FEATURES; | |
bb900b27 | 360 | |
361 | br->dev = dev; | |
362 | spin_lock_init(&br->lock); | |
363 | INIT_LIST_HEAD(&br->port_list); | |
364 | spin_lock_init(&br->hash_lock); | |
365 | ||
366 | br->bridge_id.prio[0] = 0x80; | |
367 | br->bridge_id.prio[1] = 0x00; | |
368 | ||
e5a727f6 | 369 | ether_addr_copy(br->group_addr, eth_reserved_addr_base); |
bb900b27 | 370 | |
bb900b27 | 371 | br->stp_enabled = BR_NO_STP; |
515853cc | 372 | br->group_fwd_mask = BR_GROUPFWD_DEFAULT; |
373 | ||
bb900b27 | 374 | br->designated_root = br->bridge_id; |
375 | br->bridge_max_age = br->max_age = 20 * HZ; | |
376 | br->bridge_hello_time = br->hello_time = 2 * HZ; | |
377 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; | |
378 | br->ageing_time = 300 * HZ; | |
379 | ||
380 | br_netfilter_rtable_init(br); | |
381 | br_stp_timer_init(br); | |
382 | br_multicast_init(br); | |
1da177e4 | 383 | } |