blob: 9ec0822f440b9090248b37f1dde1b9be121948f9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device handling code
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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>
WANG Congc06ee962010-05-06 00:48:24 -070016#include <linux/netpoll.h>
Stephen Hemminger4505a3e2005-12-21 18:51:49 -080017#include <linux/etherdevice.h>
Stephen Hemmingeredb5e462005-12-21 19:00:58 -080018#include <linux/ethtool.h>
WANG Congc06ee962010-05-06 00:48:24 -070019#include <linux/list.h>
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020020#include <linux/netfilter_bridge.h>
Stephen Hemminger4505a3e2005-12-21 18:51:49 -080021
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/uaccess.h>
23#include "br_private.h"
24
stephen hemmingereeaf61d2010-07-27 08:26:30 +000025/* net device transmit always called with BH disabled */
Stephen Hemminger6fef4c02009-08-31 19:50:41 +000026netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
28 struct net_bridge *br = netdev_priv(dev);
29 const unsigned char *dest = skb->data;
30 struct net_bridge_fdb_entry *dst;
Herbert Xuc4fcb782010-02-27 19:41:48 +000031 struct net_bridge_mdb_entry *mdst;
stephen hemminger14bb4782010-03-02 13:32:09 +000032 struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
33
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020034#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
Herbert Xu6088a532010-02-27 19:41:42 +000041 BR_INPUT_SKB_CB(skb)->brdev = dev;
42
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070043 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 skb_pull(skb, ETH_HLEN);
45
Ashish Sharma21ab8502011-10-07 17:54:16 -070046 u64_stats_update_begin(&brstats->syncp);
47 brstats->tx_packets++;
48 /* Exclude ETH_HLEN from byte stats for consistency with Rx chain */
49 brstats->tx_bytes += skb->len;
50 u64_stats_update_end(&brstats->syncp);
51
stephen hemmingereeaf61d2010-07-27 08:26:30 +000052 rcu_read_lock();
Herbert Xu44661462011-07-05 13:58:33 +000053 if (is_broadcast_ether_addr(dest))
54 br_flood_deliver(br, skb);
55 else if (is_multicast_ether_addr(dest)) {
Herbert Xu91d2c342010-06-10 16:12:50 +000056 if (unlikely(netpoll_tx_running(dev))) {
57 br_flood_deliver(br, skb);
58 goto out;
59 }
Herbert Xu6d1d1d32010-07-29 01:12:31 +000060 if (br_multicast_rcv(br, NULL, skb)) {
61 kfree_skb(skb);
Herbert Xuc4fcb782010-02-27 19:41:48 +000062 goto out;
Herbert Xu6d1d1d32010-07-29 01:12:31 +000063 }
Herbert Xuc4fcb782010-02-27 19:41:48 +000064
65 mdst = br_mdb_get(br, skb);
YOSHIFUJI Hideaki / 吉藤英明32dec5d2010-03-15 21:51:18 +000066 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
Herbert Xuc4fcb782010-02-27 19:41:48 +000067 br_multicast_deliver(mdst, skb);
68 else
69 br_flood_deliver(br, skb);
70 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 br_deliver(dst->dst, skb);
72 else
Herbert Xue081e1e2007-09-16 16:20:48 -070073 br_flood_deliver(br, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Herbert Xuc4fcb782010-02-27 19:41:48 +000075out:
stephen hemmingereeaf61d2010-07-27 08:26:30 +000076 rcu_read_unlock();
Patrick McHardy6ed10652009-06-23 06:03:08 +000077 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
stephen hemmingerbb900b22011-04-04 14:03:32 +000080static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static int br_dev_open(struct net_device *dev)
92{
Stephen Hemminger81d35302005-05-29 14:15:17 -070093 struct net_bridge *br = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Michał Mirosławc4d27ef2011-04-22 06:31:16 +000095 netdev_update_features(dev);
Stephen Hemminger81d35302005-05-29 14:15:17 -070096 netif_start_queue(dev);
97 br_stp_enable_bridge(br);
Herbert Xu3fe2d7c2010-02-28 00:49:38 -080098 br_multicast_open(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 return 0;
101}
102
103static void br_dev_set_multicast_list(struct net_device *dev)
104{
105}
106
107static int br_dev_stop(struct net_device *dev)
108{
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800109 struct net_bridge *br = netdev_priv(dev);
110
111 br_stp_disable_bridge(br);
112 br_multicast_stop(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 netif_stop_queue(dev);
115
116 return 0;
117}
118
Eric Dumazet28172732010-07-07 14:58:56 -0700119static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
120 struct rtnl_link_stats64 *stats)
stephen hemminger14bb4782010-03-02 13:32:09 +0000121{
122 struct net_bridge *br = netdev_priv(dev);
Eric Dumazet406818f2010-06-23 13:00:48 -0700123 struct br_cpu_netstats tmp, sum = { 0 };
stephen hemminger14bb4782010-03-02 13:32:09 +0000124 unsigned int cpu;
125
126 for_each_possible_cpu(cpu) {
Eric Dumazet406818f2010-06-23 13:00:48 -0700127 unsigned int start;
stephen hemminger14bb4782010-03-02 13:32:09 +0000128 const struct br_cpu_netstats *bstats
129 = per_cpu_ptr(br->stats, cpu);
Eric Dumazet406818f2010-06-23 13:00:48 -0700130 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;
stephen hemminger14bb4782010-03-02 13:32:09 +0000138 }
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148static int br_change_mtu(struct net_device *dev, int new_mtu)
149{
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700150 struct net_bridge *br = netdev_priv(dev);
151 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 return -EINVAL;
153
154 dev->mtu = new_mtu;
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700155
156#ifdef CONFIG_BRIDGE_NETFILTER
157 /* remember the MTU in the rtable for PMTU */
David S. Millerdefb3512010-12-08 21:16:57 -0800158 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700159#endif
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return 0;
162}
163
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700164/* Allow setting mac address to any valid ethernet address. */
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800165static 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;
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700169
170 if (!is_valid_ether_addr(addr->sa_data))
Danny Kukawka7ca1e112012-02-21 02:07:52 +0000171 return -EADDRNOTAVAIL;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800172
173 spin_lock_bh(&br->lock);
stephen hemminger43598812011-12-08 07:17:49 +0000174 if (compare_ether_addr(dev->dev_addr, addr->sa_data)) {
Danny Kukawka7ce5d222012-02-15 06:45:40 +0000175 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
stephen hemminger43598812011-12-08 07:17:49 +0000176 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
177 br_fdb_change_mac_address(br, addr->sa_data);
178 br_stp_change_bridge_id(br, addr->sa_data);
179 }
Stephen Hemminger92c05742008-06-17 16:10:06 -0700180 br->flags |= BR_SET_MAC_ADDR;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800181 spin_unlock_bh(&br->lock);
182
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700183 return 0;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800184}
185
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800186static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
187{
188 strcpy(info->driver, "bridge");
189 strcpy(info->version, BR_VERSION);
190 strcpy(info->fw_version, "N/A");
191 strcpy(info->bus_info, "N/A");
192}
193
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000194static netdev_features_t br_fix_features(struct net_device *dev,
195 netdev_features_t features)
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800196{
197 struct net_bridge *br = netdev_priv(dev);
198
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000199 return br_features_recompute(br, features);
Jesse Gross361ff8a2010-10-20 13:56:08 +0000200}
201
WANG Congc06ee962010-05-06 00:48:24 -0700202#ifdef CONFIG_NET_POLL_CONTROLLER
WANG Congc06ee962010-05-06 00:48:24 -0700203static void br_poll_controller(struct net_device *br_dev)
204{
WANG Congc06ee962010-05-06 00:48:24 -0700205}
206
Herbert Xu91d2c342010-06-10 16:12:50 +0000207static void br_netpoll_cleanup(struct net_device *dev)
WANG Congc06ee962010-05-06 00:48:24 -0700208{
stephen hemmingercfb478d2010-05-10 09:31:08 +0000209 struct net_bridge *br = netdev_priv(dev);
WANG Congc06ee962010-05-06 00:48:24 -0700210 struct net_bridge_port *p, *n;
WANG Congc06ee962010-05-06 00:48:24 -0700211
WANG Congc06ee962010-05-06 00:48:24 -0700212 list_for_each_entry_safe(p, n, &br->port_list, list) {
Herbert Xu91d2c342010-06-10 16:12:50 +0000213 br_netpoll_disable(p);
WANG Congc06ee962010-05-06 00:48:24 -0700214 }
215}
216
Herbert Xu91d2c342010-06-10 16:12:50 +0000217static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
WANG Congc06ee962010-05-06 00:48:24 -0700218{
Herbert Xu91d2c342010-06-10 16:12:50 +0000219 struct net_bridge *br = netdev_priv(dev);
220 struct net_bridge_port *p, *n;
221 int err = 0;
222
223 list_for_each_entry_safe(p, n, &br->port_list, list) {
224 if (!p->dev)
225 continue;
226
227 err = br_netpoll_enable(p);
228 if (err)
229 goto fail;
230 }
231
232out:
233 return err;
234
235fail:
236 br_netpoll_cleanup(dev);
237 goto out;
stephen hemmingercfb478d2010-05-10 09:31:08 +0000238}
239
Herbert Xu91d2c342010-06-10 16:12:50 +0000240int br_netpoll_enable(struct net_bridge_port *p)
stephen hemmingercfb478d2010-05-10 09:31:08 +0000241{
Herbert Xu91d2c342010-06-10 16:12:50 +0000242 struct netpoll *np;
243 int err = 0;
244
245 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
246 err = -ENOMEM;
247 if (!np)
248 goto out;
249
250 np->dev = p->dev;
WANG Congcefa9992011-06-19 16:13:01 -0700251 strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
Herbert Xu91d2c342010-06-10 16:12:50 +0000252
253 err = __netpoll_setup(np);
254 if (err) {
255 kfree(np);
256 goto out;
stephen hemmingercfb478d2010-05-10 09:31:08 +0000257 }
Herbert Xu91d2c342010-06-10 16:12:50 +0000258
259 p->np = np;
260
261out:
262 return err;
263}
264
265void br_netpoll_disable(struct net_bridge_port *p)
266{
267 struct netpoll *np = p->np;
268
269 if (!np)
270 return;
271
272 p->np = NULL;
273
274 /* Wait for transmitting packets to finish before freeing. */
275 synchronize_rcu_bh();
276
277 __netpoll_cleanup(np);
278 kfree(np);
WANG Congc06ee962010-05-06 00:48:24 -0700279}
280
281#endif
282
Jiri Pirkoafc61512011-02-13 09:33:42 +0000283static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
284
285{
286 struct net_bridge *br = netdev_priv(dev);
287
288 return br_add_if(br, slave_dev);
289}
290
291static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
292{
293 struct net_bridge *br = netdev_priv(dev);
294
295 return br_del_if(br, slave_dev);
296}
297
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800298static const struct ethtool_ops br_ethtool_ops = {
Stephen Hemmingere4119a42008-08-15 19:51:07 -0700299 .get_drvinfo = br_getinfo,
300 .get_link = ethtool_op_get_link,
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800301};
302
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800303static const struct net_device_ops br_netdev_ops = {
304 .ndo_open = br_dev_open,
305 .ndo_stop = br_dev_stop,
stephen hemmingerbb900b22011-04-04 14:03:32 +0000306 .ndo_init = br_dev_init,
Stephen Hemminger00829822008-11-20 20:14:53 -0800307 .ndo_start_xmit = br_dev_xmit,
Eric Dumazet406818f2010-06-23 13:00:48 -0700308 .ndo_get_stats64 = br_get_stats64,
Stephen Hemminger00829822008-11-20 20:14:53 -0800309 .ndo_set_mac_address = br_set_mac_address,
Jiri Pirkoafc4b132011-08-16 06:29:01 +0000310 .ndo_set_rx_mode = br_dev_set_multicast_list,
Stephen Hemminger00829822008-11-20 20:14:53 -0800311 .ndo_change_mtu = br_change_mtu,
312 .ndo_do_ioctl = br_dev_ioctl,
WANG Congc06ee962010-05-06 00:48:24 -0700313#ifdef CONFIG_NET_POLL_CONTROLLER
Herbert Xu91d2c342010-06-10 16:12:50 +0000314 .ndo_netpoll_setup = br_netpoll_setup,
WANG Congc06ee962010-05-06 00:48:24 -0700315 .ndo_netpoll_cleanup = br_netpoll_cleanup,
316 .ndo_poll_controller = br_poll_controller,
317#endif
Jiri Pirkoafc61512011-02-13 09:33:42 +0000318 .ndo_add_slave = br_add_slave,
319 .ndo_del_slave = br_del_slave,
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000320 .ndo_fix_features = br_fix_features,
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800321};
322
stephen hemminger14bb4782010-03-02 13:32:09 +0000323static void br_dev_free(struct net_device *dev)
324{
325 struct net_bridge *br = netdev_priv(dev);
326
327 free_percpu(br->stats);
328 free_netdev(dev);
329}
330
stephen hemmingerbb900b22011-04-04 14:03:32 +0000331static struct device_type br_type = {
332 .name = "bridge",
333};
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335void br_dev_setup(struct net_device *dev)
336{
stephen hemmingerbb900b22011-04-04 14:03:32 +0000337 struct net_bridge *br = netdev_priv(dev);
338
Danny Kukawka7ce5d222012-02-15 06:45:40 +0000339 eth_hw_addr_random(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ether_setup(dev);
341
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800342 dev->netdev_ops = &br_netdev_ops;
stephen hemminger14bb4782010-03-02 13:32:09 +0000343 dev->destructor = br_dev_free;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900344 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000345 SET_NETDEV_DEVTYPE(dev, &br_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 dev->tx_queue_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 dev->priv_flags = IFF_EBRIDGE;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800348
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900349 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
Michał Mirosław34324dc2011-11-15 15:29:55 +0000350 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000351 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
352 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
Michał Mirosław34324dc2011-11-15 15:29:55 +0000353 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000354 NETIF_F_HW_VLAN_TX;
stephen hemmingerbb900b22011-04-04 14:03:32 +0000355
356 br->dev = dev;
357 spin_lock_init(&br->lock);
358 INIT_LIST_HEAD(&br->port_list);
359 spin_lock_init(&br->hash_lock);
360
361 br->bridge_id.prio[0] = 0x80;
362 br->bridge_id.prio[1] = 0x00;
363
364 memcpy(br->group_addr, br_group_address, ETH_ALEN);
365
stephen hemmingerbb900b22011-04-04 14:03:32 +0000366 br->stp_enabled = BR_NO_STP;
stephen hemminger515853c2011-10-03 18:14:46 +0000367 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
368
stephen hemmingerbb900b22011-04-04 14:03:32 +0000369 br->designated_root = br->bridge_id;
370 br->bridge_max_age = br->max_age = 20 * HZ;
371 br->bridge_hello_time = br->hello_time = 2 * HZ;
372 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
373 br->ageing_time = 300 * HZ;
374
375 br_netfilter_rtable_init(br);
376 br_stp_timer_init(br);
377 br_multicast_init(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}