blob: 2ef66781fedb3a9211448fa3db73eedab2c7d8a2 [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
Vlad Yasevich161f65b2013-05-22 07:49:34 +000025#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
26 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
27
stephen hemmingereeaf61d2010-07-27 08:26:30 +000028/* net device transmit always called with BH disabled */
Stephen Hemminger6fef4c02009-08-31 19:50:41 +000029netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
31 struct net_bridge *br = netdev_priv(dev);
32 const unsigned char *dest = skb->data;
33 struct net_bridge_fdb_entry *dst;
Herbert Xuc4fcb782010-02-27 19:41:48 +000034 struct net_bridge_mdb_entry *mdst;
stephen hemminger14bb4782010-03-02 13:32:09 +000035 struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
Vlad Yasevich78851982013-02-13 12:00:14 +000036 u16 vid = 0;
stephen hemminger14bb4782010-03-02 13:32:09 +000037
Stephen Hemmingerc03307e2012-08-14 08:19:33 -070038 rcu_read_lock();
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020039#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);
Stephen Hemmingerc03307e2012-08-14 08:19:33 -070042 rcu_read_unlock();
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020043 return NETDEV_TX_OK;
44 }
45#endif
46
Eric Dumazet406818f2010-06-23 13:00:48 -070047 u64_stats_update_begin(&brstats->syncp);
stephen hemminger14bb4782010-03-02 13:32:09 +000048 brstats->tx_packets++;
49 brstats->tx_bytes += skb->len;
Eric Dumazet406818f2010-06-23 13:00:48 -070050 u64_stats_update_end(&brstats->syncp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Vlad Yasevich78851982013-02-13 12:00:14 +000052 if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
Vlad Yasevicha37b85c2013-02-13 12:00:10 +000053 goto out;
54
Herbert Xu6088a532010-02-27 19:41:42 +000055 BR_INPUT_SKB_CB(skb)->brdev = dev;
56
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070057 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 skb_pull(skb, ETH_HLEN);
59
Herbert Xu44661462011-07-05 13:58:33 +000060 if (is_broadcast_ether_addr(dest))
Vlad Yasevich867a5942013-06-05 10:08:01 -040061 br_flood_deliver(br, skb, false);
Herbert Xu44661462011-07-05 13:58:33 +000062 else if (is_multicast_ether_addr(dest)) {
Herbert Xu91d2c342010-06-10 16:12:50 +000063 if (unlikely(netpoll_tx_running(dev))) {
Vlad Yasevich867a5942013-06-05 10:08:01 -040064 br_flood_deliver(br, skb, false);
Herbert Xu91d2c342010-06-10 16:12:50 +000065 goto out;
66 }
Herbert Xu6d1d1d32010-07-29 01:12:31 +000067 if (br_multicast_rcv(br, NULL, skb)) {
68 kfree_skb(skb);
Herbert Xuc4fcb782010-02-27 19:41:48 +000069 goto out;
Herbert Xu6d1d1d32010-07-29 01:12:31 +000070 }
Herbert Xuc4fcb782010-02-27 19:41:48 +000071
Cong Wangfbca58a2013-03-07 03:05:33 +000072 mdst = br_mdb_get(br, skb, vid);
YOSHIFUJI Hideaki / 吉藤英明32dec5d2010-03-15 21:51:18 +000073 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
Herbert Xuc4fcb782010-02-27 19:41:48 +000074 br_multicast_deliver(mdst, skb);
75 else
Vlad Yasevich867a5942013-06-05 10:08:01 -040076 br_flood_deliver(br, skb, false);
Vlad Yasevich2ba071e2013-02-13 12:00:16 +000077 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 br_deliver(dst->dst, skb);
79 else
Vlad Yasevich867a5942013-06-05 10:08:01 -040080 br_flood_deliver(br, skb, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Herbert Xuc4fcb782010-02-27 19:41:48 +000082out:
stephen hemmingereeaf61d2010-07-27 08:26:30 +000083 rcu_read_unlock();
Patrick McHardy6ed10652009-06-23 06:03:08 +000084 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085}
86
stephen hemmingerbb900b22011-04-04 14:03:32 +000087static int br_dev_init(struct net_device *dev)
88{
89 struct net_bridge *br = netdev_priv(dev);
90
91 br->stats = alloc_percpu(struct br_cpu_netstats);
92 if (!br->stats)
93 return -ENOMEM;
94
95 return 0;
96}
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098static int br_dev_open(struct net_device *dev)
99{
Stephen Hemminger81d35302005-05-29 14:15:17 -0700100 struct net_bridge *br = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000102 netdev_update_features(dev);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700103 netif_start_queue(dev);
104 br_stp_enable_bridge(br);
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800105 br_multicast_open(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 return 0;
108}
109
110static void br_dev_set_multicast_list(struct net_device *dev)
111{
112}
113
114static int br_dev_stop(struct net_device *dev)
115{
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800116 struct net_bridge *br = netdev_priv(dev);
117
118 br_stp_disable_bridge(br);
119 br_multicast_stop(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 netif_stop_queue(dev);
122
123 return 0;
124}
125
Eric Dumazet28172732010-07-07 14:58:56 -0700126static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
127 struct rtnl_link_stats64 *stats)
stephen hemminger14bb4782010-03-02 13:32:09 +0000128{
129 struct net_bridge *br = netdev_priv(dev);
Eric Dumazet406818f2010-06-23 13:00:48 -0700130 struct br_cpu_netstats tmp, sum = { 0 };
stephen hemminger14bb4782010-03-02 13:32:09 +0000131 unsigned int cpu;
132
133 for_each_possible_cpu(cpu) {
Eric Dumazet406818f2010-06-23 13:00:48 -0700134 unsigned int start;
stephen hemminger14bb4782010-03-02 13:32:09 +0000135 const struct br_cpu_netstats *bstats
136 = per_cpu_ptr(br->stats, cpu);
Eric Dumazet406818f2010-06-23 13:00:48 -0700137 do {
Kevin Groenevelde3906482012-07-21 06:30:50 +0000138 start = u64_stats_fetch_begin_bh(&bstats->syncp);
Eric Dumazet406818f2010-06-23 13:00:48 -0700139 memcpy(&tmp, bstats, sizeof(tmp));
Kevin Groenevelde3906482012-07-21 06:30:50 +0000140 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
Eric Dumazet406818f2010-06-23 13:00:48 -0700141 sum.tx_bytes += tmp.tx_bytes;
142 sum.tx_packets += tmp.tx_packets;
143 sum.rx_bytes += tmp.rx_bytes;
144 sum.rx_packets += tmp.rx_packets;
stephen hemminger14bb4782010-03-02 13:32:09 +0000145 }
146
147 stats->tx_bytes = sum.tx_bytes;
148 stats->tx_packets = sum.tx_packets;
149 stats->rx_bytes = sum.rx_bytes;
150 stats->rx_packets = sum.rx_packets;
151
152 return stats;
153}
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static int br_change_mtu(struct net_device *dev, int new_mtu)
156{
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700157 struct net_bridge *br = netdev_priv(dev);
158 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return -EINVAL;
160
161 dev->mtu = new_mtu;
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700162
163#ifdef CONFIG_BRIDGE_NETFILTER
164 /* remember the MTU in the rtable for PMTU */
David S. Millerdefb3512010-12-08 21:16:57 -0800165 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700166#endif
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return 0;
169}
170
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700171/* Allow setting mac address to any valid ethernet address. */
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800172static int br_set_mac_address(struct net_device *dev, void *p)
173{
174 struct net_bridge *br = netdev_priv(dev);
175 struct sockaddr *addr = p;
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700176
177 if (!is_valid_ether_addr(addr->sa_data))
Danny Kukawka7ca1e112012-02-21 02:07:52 +0000178 return -EADDRNOTAVAIL;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800179
180 spin_lock_bh(&br->lock);
Joe Perches9a7b6ef92012-05-08 18:56:49 +0000181 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
stephen hemminger43598812011-12-08 07:17:49 +0000182 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
183 br_fdb_change_mac_address(br, addr->sa_data);
184 br_stp_change_bridge_id(br, addr->sa_data);
185 }
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800186 spin_unlock_bh(&br->lock);
187
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700188 return 0;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800189}
190
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800191static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
192{
Jiri Pirko7826d432013-01-06 00:44:26 +0000193 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));
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800197}
198
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000199static netdev_features_t br_fix_features(struct net_device *dev,
200 netdev_features_t features)
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800201{
202 struct net_bridge *br = netdev_priv(dev);
203
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000204 return br_features_recompute(br, features);
Jesse Gross361ff8a2010-10-20 13:56:08 +0000205}
206
WANG Congc06ee962010-05-06 00:48:24 -0700207#ifdef CONFIG_NET_POLL_CONTROLLER
WANG Congc06ee962010-05-06 00:48:24 -0700208static void br_poll_controller(struct net_device *br_dev)
209{
WANG Congc06ee962010-05-06 00:48:24 -0700210}
211
Herbert Xu91d2c342010-06-10 16:12:50 +0000212static void br_netpoll_cleanup(struct net_device *dev)
WANG Congc06ee962010-05-06 00:48:24 -0700213{
stephen hemmingercfb478d2010-05-10 09:31:08 +0000214 struct net_bridge *br = netdev_priv(dev);
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000215 struct net_bridge_port *p;
WANG Congc06ee962010-05-06 00:48:24 -0700216
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000217 list_for_each_entry(p, &br->port_list, list)
Herbert Xu91d2c342010-06-10 16:12:50 +0000218 br_netpoll_disable(p);
WANG Congc06ee962010-05-06 00:48:24 -0700219}
220
Amerigo Wang47be03a22012-08-10 01:24:37 +0000221static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
222 gfp_t gfp)
WANG Congc06ee962010-05-06 00:48:24 -0700223{
Herbert Xu91d2c342010-06-10 16:12:50 +0000224 struct net_bridge *br = netdev_priv(dev);
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000225 struct net_bridge_port *p;
Herbert Xu91d2c342010-06-10 16:12:50 +0000226 int err = 0;
227
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000228 list_for_each_entry(p, &br->port_list, list) {
Herbert Xu91d2c342010-06-10 16:12:50 +0000229 if (!p->dev)
230 continue;
Amerigo Wang47be03a22012-08-10 01:24:37 +0000231 err = br_netpoll_enable(p, gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000232 if (err)
233 goto fail;
234 }
235
236out:
237 return err;
238
239fail:
240 br_netpoll_cleanup(dev);
241 goto out;
stephen hemmingercfb478d2010-05-10 09:31:08 +0000242}
243
Amerigo Wang47be03a22012-08-10 01:24:37 +0000244int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
stephen hemmingercfb478d2010-05-10 09:31:08 +0000245{
Herbert Xu91d2c342010-06-10 16:12:50 +0000246 struct netpoll *np;
247 int err = 0;
248
Amerigo Wang47be03a22012-08-10 01:24:37 +0000249 np = kzalloc(sizeof(*p->np), gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000250 err = -ENOMEM;
251 if (!np)
252 goto out;
253
Amerigo Wang47be03a22012-08-10 01:24:37 +0000254 err = __netpoll_setup(np, p->dev, gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000255 if (err) {
256 kfree(np);
257 goto out;
stephen hemmingercfb478d2010-05-10 09:31:08 +0000258 }
Herbert Xu91d2c342010-06-10 16:12:50 +0000259
260 p->np = np;
261
262out:
263 return err;
264}
265
266void br_netpoll_disable(struct net_bridge_port *p)
267{
268 struct netpoll *np = p->np;
269
270 if (!np)
271 return;
272
273 p->np = NULL;
274
Neil Horman2cde6ac2013-02-11 10:25:30 +0000275 __netpoll_free_async(np);
WANG Congc06ee962010-05-06 00:48:24 -0700276}
277
278#endif
279
Jiri Pirkoafc61512011-02-13 09:33:42 +0000280static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
281
282{
283 struct net_bridge *br = netdev_priv(dev);
284
285 return br_add_if(br, slave_dev);
286}
287
288static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
289{
290 struct net_bridge *br = netdev_priv(dev);
291
292 return br_del_if(br, slave_dev);
293}
294
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800295static const struct ethtool_ops br_ethtool_ops = {
Stephen Hemmingere4119a42008-08-15 19:51:07 -0700296 .get_drvinfo = br_getinfo,
297 .get_link = ethtool_op_get_link,
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800298};
299
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800300static const struct net_device_ops br_netdev_ops = {
301 .ndo_open = br_dev_open,
302 .ndo_stop = br_dev_stop,
stephen hemmingerbb900b22011-04-04 14:03:32 +0000303 .ndo_init = br_dev_init,
Stephen Hemminger00829822008-11-20 20:14:53 -0800304 .ndo_start_xmit = br_dev_xmit,
Eric Dumazet406818f2010-06-23 13:00:48 -0700305 .ndo_get_stats64 = br_get_stats64,
Stephen Hemminger00829822008-11-20 20:14:53 -0800306 .ndo_set_mac_address = br_set_mac_address,
Jiri Pirkoafc4b132011-08-16 06:29:01 +0000307 .ndo_set_rx_mode = br_dev_set_multicast_list,
Stephen Hemminger00829822008-11-20 20:14:53 -0800308 .ndo_change_mtu = br_change_mtu,
309 .ndo_do_ioctl = br_dev_ioctl,
WANG Congc06ee962010-05-06 00:48:24 -0700310#ifdef CONFIG_NET_POLL_CONTROLLER
Herbert Xu91d2c342010-06-10 16:12:50 +0000311 .ndo_netpoll_setup = br_netpoll_setup,
WANG Congc06ee962010-05-06 00:48:24 -0700312 .ndo_netpoll_cleanup = br_netpoll_cleanup,
313 .ndo_poll_controller = br_poll_controller,
314#endif
Jiri Pirkoafc61512011-02-13 09:33:42 +0000315 .ndo_add_slave = br_add_slave,
316 .ndo_del_slave = br_del_slave,
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000317 .ndo_fix_features = br_fix_features,
John Fastabend77162022012-04-15 06:43:56 +0000318 .ndo_fdb_add = br_fdb_add,
319 .ndo_fdb_del = br_fdb_delete,
320 .ndo_fdb_dump = br_fdb_dump,
John Fastabende5a55a82012-10-24 08:12:57 +0000321 .ndo_bridge_getlink = br_getlink,
322 .ndo_bridge_setlink = br_setlink,
Vlad Yasevich407af322013-02-13 12:00:12 +0000323 .ndo_bridge_dellink = br_dellink,
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800324};
325
stephen hemminger14bb4782010-03-02 13:32:09 +0000326static void br_dev_free(struct net_device *dev)
327{
328 struct net_bridge *br = netdev_priv(dev);
329
330 free_percpu(br->stats);
331 free_netdev(dev);
332}
333
stephen hemmingerbb900b22011-04-04 14:03:32 +0000334static struct device_type br_type = {
335 .name = "bridge",
336};
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338void br_dev_setup(struct net_device *dev)
339{
stephen hemmingerbb900b22011-04-04 14:03:32 +0000340 struct net_bridge *br = netdev_priv(dev);
341
Danny Kukawka7ce5d222012-02-15 06:45:40 +0000342 eth_hw_addr_random(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 ether_setup(dev);
344
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800345 dev->netdev_ops = &br_netdev_ops;
stephen hemminger14bb4782010-03-02 13:32:09 +0000346 dev->destructor = br_dev_free;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900347 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000348 SET_NETDEV_DEVTYPE(dev, &br_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 dev->tx_queue_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 dev->priv_flags = IFF_EBRIDGE;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800351
Vlad Yasevich161f65b2013-05-22 07:49:34 +0000352 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
353 NETIF_F_HW_VLAN_CTAG_TX;
354 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
355 dev->vlan_features = COMMON_FEATURES;
stephen hemmingerbb900b22011-04-04 14:03:32 +0000356
357 br->dev = dev;
358 spin_lock_init(&br->lock);
359 INIT_LIST_HEAD(&br->port_list);
360 spin_lock_init(&br->hash_lock);
361
362 br->bridge_id.prio[0] = 0x80;
363 br->bridge_id.prio[1] = 0x00;
364
Ben Hutchings2bc80052012-11-01 09:12:02 +0000365 memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000366
stephen hemmingerbb900b22011-04-04 14:03:32 +0000367 br->stp_enabled = BR_NO_STP;
stephen hemminger515853c2011-10-03 18:14:46 +0000368 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
369
stephen hemmingerbb900b22011-04-04 14:03:32 +0000370 br->designated_root = br->bridge_id;
371 br->bridge_max_age = br->max_age = 20 * HZ;
372 br->bridge_hello_time = br->hello_time = 2 * HZ;
373 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
374 br->ageing_time = 300 * HZ;
375
376 br_netfilter_rtable_init(br);
377 br_stp_timer_init(br);
378 br_multicast_init(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379}