blob: 35a2c2c84f33d6dc26771b9c54557d5bfb271e10 [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
Stephen Hemmingerc03307e2012-08-14 08:19:33 -070034 rcu_read_lock();
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020035#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);
Stephen Hemmingerc03307e2012-08-14 08:19:33 -070038 rcu_read_unlock();
Bart De Schuymerea2d9b42010-04-15 12:14:51 +020039 return NETDEV_TX_OK;
40 }
41#endif
42
Eric Dumazet406818f2010-06-23 13:00:48 -070043 u64_stats_update_begin(&brstats->syncp);
stephen hemminger14bb4782010-03-02 13:32:09 +000044 brstats->tx_packets++;
45 brstats->tx_bytes += skb->len;
Eric Dumazet406818f2010-06-23 13:00:48 -070046 u64_stats_update_end(&brstats->syncp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Vlad Yasevicha37b85c2013-02-13 12:00:10 +000048 if (!br_allowed_ingress(br, br_get_vlan_info(br), skb))
49 goto out;
50
Herbert Xu6088a532010-02-27 19:41:42 +000051 BR_INPUT_SKB_CB(skb)->brdev = dev;
52
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070053 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 skb_pull(skb, ETH_HLEN);
55
Herbert Xu44661462011-07-05 13:58:33 +000056 if (is_broadcast_ether_addr(dest))
57 br_flood_deliver(br, skb);
58 else if (is_multicast_ether_addr(dest)) {
Herbert Xu91d2c342010-06-10 16:12:50 +000059 if (unlikely(netpoll_tx_running(dev))) {
60 br_flood_deliver(br, skb);
61 goto out;
62 }
Herbert Xu6d1d1d32010-07-29 01:12:31 +000063 if (br_multicast_rcv(br, NULL, skb)) {
64 kfree_skb(skb);
Herbert Xuc4fcb782010-02-27 19:41:48 +000065 goto out;
Herbert Xu6d1d1d32010-07-29 01:12:31 +000066 }
Herbert Xuc4fcb782010-02-27 19:41:48 +000067
68 mdst = br_mdb_get(br, skb);
YOSHIFUJI Hideaki / 吉藤英明32dec5d2010-03-15 21:51:18 +000069 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
Herbert Xuc4fcb782010-02-27 19:41:48 +000070 br_multicast_deliver(mdst, skb);
71 else
72 br_flood_deliver(br, skb);
73 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 br_deliver(dst->dst, skb);
75 else
Herbert Xue081e1e2007-09-16 16:20:48 -070076 br_flood_deliver(br, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Herbert Xuc4fcb782010-02-27 19:41:48 +000078out:
stephen hemmingereeaf61d2010-07-27 08:26:30 +000079 rcu_read_unlock();
Patrick McHardy6ed10652009-06-23 06:03:08 +000080 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
stephen hemmingerbb900b22011-04-04 14:03:32 +000083static int br_dev_init(struct net_device *dev)
84{
85 struct net_bridge *br = netdev_priv(dev);
86
87 br->stats = alloc_percpu(struct br_cpu_netstats);
88 if (!br->stats)
89 return -ENOMEM;
90
91 return 0;
92}
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static int br_dev_open(struct net_device *dev)
95{
Stephen Hemminger81d35302005-05-29 14:15:17 -070096 struct net_bridge *br = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Michał Mirosławc4d27ef2011-04-22 06:31:16 +000098 netdev_update_features(dev);
Stephen Hemminger81d35302005-05-29 14:15:17 -070099 netif_start_queue(dev);
100 br_stp_enable_bridge(br);
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800101 br_multicast_open(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 return 0;
104}
105
106static void br_dev_set_multicast_list(struct net_device *dev)
107{
108}
109
110static int br_dev_stop(struct net_device *dev)
111{
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800112 struct net_bridge *br = netdev_priv(dev);
113
114 br_stp_disable_bridge(br);
115 br_multicast_stop(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 netif_stop_queue(dev);
118
119 return 0;
120}
121
Eric Dumazet28172732010-07-07 14:58:56 -0700122static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
123 struct rtnl_link_stats64 *stats)
stephen hemminger14bb4782010-03-02 13:32:09 +0000124{
125 struct net_bridge *br = netdev_priv(dev);
Eric Dumazet406818f2010-06-23 13:00:48 -0700126 struct br_cpu_netstats tmp, sum = { 0 };
stephen hemminger14bb4782010-03-02 13:32:09 +0000127 unsigned int cpu;
128
129 for_each_possible_cpu(cpu) {
Eric Dumazet406818f2010-06-23 13:00:48 -0700130 unsigned int start;
stephen hemminger14bb4782010-03-02 13:32:09 +0000131 const struct br_cpu_netstats *bstats
132 = per_cpu_ptr(br->stats, cpu);
Eric Dumazet406818f2010-06-23 13:00:48 -0700133 do {
Kevin Groenevelde3906482012-07-21 06:30:50 +0000134 start = u64_stats_fetch_begin_bh(&bstats->syncp);
Eric Dumazet406818f2010-06-23 13:00:48 -0700135 memcpy(&tmp, bstats, sizeof(tmp));
Kevin Groenevelde3906482012-07-21 06:30:50 +0000136 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
Eric Dumazet406818f2010-06-23 13:00:48 -0700137 sum.tx_bytes += tmp.tx_bytes;
138 sum.tx_packets += tmp.tx_packets;
139 sum.rx_bytes += tmp.rx_bytes;
140 sum.rx_packets += tmp.rx_packets;
stephen hemminger14bb4782010-03-02 13:32:09 +0000141 }
142
143 stats->tx_bytes = sum.tx_bytes;
144 stats->tx_packets = sum.tx_packets;
145 stats->rx_bytes = sum.rx_bytes;
146 stats->rx_packets = sum.rx_packets;
147
148 return stats;
149}
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151static int br_change_mtu(struct net_device *dev, int new_mtu)
152{
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700153 struct net_bridge *br = netdev_priv(dev);
154 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return -EINVAL;
156
157 dev->mtu = new_mtu;
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700158
159#ifdef CONFIG_BRIDGE_NETFILTER
160 /* remember the MTU in the rtable for PMTU */
David S. Millerdefb3512010-12-08 21:16:57 -0800161 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
Simon Wunderlich4adf0af2008-07-30 16:27:55 -0700162#endif
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 return 0;
165}
166
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700167/* Allow setting mac address to any valid ethernet address. */
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800168static int br_set_mac_address(struct net_device *dev, void *p)
169{
170 struct net_bridge *br = netdev_priv(dev);
171 struct sockaddr *addr = p;
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700172
173 if (!is_valid_ether_addr(addr->sa_data))
Danny Kukawka7ca1e112012-02-21 02:07:52 +0000174 return -EADDRNOTAVAIL;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800175
176 spin_lock_bh(&br->lock);
Joe Perches9a7b6ef92012-05-08 18:56:49 +0000177 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
stephen hemminger43598812011-12-08 07:17:49 +0000178 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
179 br_fdb_change_mac_address(br, addr->sa_data);
180 br_stp_change_bridge_id(br, addr->sa_data);
181 }
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800182 spin_unlock_bh(&br->lock);
183
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700184 return 0;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800185}
186
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800187static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
188{
Jiri Pirko7826d432013-01-06 00:44:26 +0000189 strlcpy(info->driver, "bridge", sizeof(info->driver));
190 strlcpy(info->version, BR_VERSION, sizeof(info->version));
191 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
192 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800193}
194
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000195static netdev_features_t br_fix_features(struct net_device *dev,
196 netdev_features_t features)
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800197{
198 struct net_bridge *br = netdev_priv(dev);
199
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000200 return br_features_recompute(br, features);
Jesse Gross361ff8a2010-10-20 13:56:08 +0000201}
202
WANG Congc06ee962010-05-06 00:48:24 -0700203#ifdef CONFIG_NET_POLL_CONTROLLER
WANG Congc06ee962010-05-06 00:48:24 -0700204static void br_poll_controller(struct net_device *br_dev)
205{
WANG Congc06ee962010-05-06 00:48:24 -0700206}
207
Herbert Xu91d2c342010-06-10 16:12:50 +0000208static void br_netpoll_cleanup(struct net_device *dev)
WANG Congc06ee962010-05-06 00:48:24 -0700209{
stephen hemmingercfb478d2010-05-10 09:31:08 +0000210 struct net_bridge *br = netdev_priv(dev);
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000211 struct net_bridge_port *p;
WANG Congc06ee962010-05-06 00:48:24 -0700212
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000213 list_for_each_entry(p, &br->port_list, list)
Herbert Xu91d2c342010-06-10 16:12:50 +0000214 br_netpoll_disable(p);
WANG Congc06ee962010-05-06 00:48:24 -0700215}
216
Amerigo Wang47be03a22012-08-10 01:24:37 +0000217static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
218 gfp_t gfp)
WANG Congc06ee962010-05-06 00:48:24 -0700219{
Herbert Xu91d2c342010-06-10 16:12:50 +0000220 struct net_bridge *br = netdev_priv(dev);
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000221 struct net_bridge_port *p;
Herbert Xu91d2c342010-06-10 16:12:50 +0000222 int err = 0;
223
Amerigo Wang4e3828c2012-08-10 01:24:44 +0000224 list_for_each_entry(p, &br->port_list, list) {
Herbert Xu91d2c342010-06-10 16:12:50 +0000225 if (!p->dev)
226 continue;
Amerigo Wang47be03a22012-08-10 01:24:37 +0000227 err = br_netpoll_enable(p, gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000228 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
Amerigo Wang47be03a22012-08-10 01:24:37 +0000240int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
stephen hemmingercfb478d2010-05-10 09:31:08 +0000241{
Herbert Xu91d2c342010-06-10 16:12:50 +0000242 struct netpoll *np;
243 int err = 0;
244
Amerigo Wang47be03a22012-08-10 01:24:37 +0000245 np = kzalloc(sizeof(*p->np), gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000246 err = -ENOMEM;
247 if (!np)
248 goto out;
249
Amerigo Wang47be03a22012-08-10 01:24:37 +0000250 err = __netpoll_setup(np, p->dev, gfp);
Herbert Xu91d2c342010-06-10 16:12:50 +0000251 if (err) {
252 kfree(np);
253 goto out;
stephen hemmingercfb478d2010-05-10 09:31:08 +0000254 }
Herbert Xu91d2c342010-06-10 16:12:50 +0000255
256 p->np = np;
257
258out:
259 return err;
260}
261
262void br_netpoll_disable(struct net_bridge_port *p)
263{
264 struct netpoll *np = p->np;
265
266 if (!np)
267 return;
268
269 p->np = NULL;
270
Neil Horman2cde6ac2013-02-11 10:25:30 +0000271 __netpoll_free_async(np);
WANG Congc06ee962010-05-06 00:48:24 -0700272}
273
274#endif
275
Jiri Pirkoafc61512011-02-13 09:33:42 +0000276static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
277
278{
279 struct net_bridge *br = netdev_priv(dev);
280
281 return br_add_if(br, slave_dev);
282}
283
284static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
285{
286 struct net_bridge *br = netdev_priv(dev);
287
288 return br_del_if(br, slave_dev);
289}
290
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800291static const struct ethtool_ops br_ethtool_ops = {
Stephen Hemmingere4119a42008-08-15 19:51:07 -0700292 .get_drvinfo = br_getinfo,
293 .get_link = ethtool_op_get_link,
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800294};
295
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800296static const struct net_device_ops br_netdev_ops = {
297 .ndo_open = br_dev_open,
298 .ndo_stop = br_dev_stop,
stephen hemmingerbb900b22011-04-04 14:03:32 +0000299 .ndo_init = br_dev_init,
Stephen Hemminger00829822008-11-20 20:14:53 -0800300 .ndo_start_xmit = br_dev_xmit,
Eric Dumazet406818f2010-06-23 13:00:48 -0700301 .ndo_get_stats64 = br_get_stats64,
Stephen Hemminger00829822008-11-20 20:14:53 -0800302 .ndo_set_mac_address = br_set_mac_address,
Jiri Pirkoafc4b132011-08-16 06:29:01 +0000303 .ndo_set_rx_mode = br_dev_set_multicast_list,
Stephen Hemminger00829822008-11-20 20:14:53 -0800304 .ndo_change_mtu = br_change_mtu,
305 .ndo_do_ioctl = br_dev_ioctl,
WANG Congc06ee962010-05-06 00:48:24 -0700306#ifdef CONFIG_NET_POLL_CONTROLLER
Herbert Xu91d2c342010-06-10 16:12:50 +0000307 .ndo_netpoll_setup = br_netpoll_setup,
WANG Congc06ee962010-05-06 00:48:24 -0700308 .ndo_netpoll_cleanup = br_netpoll_cleanup,
309 .ndo_poll_controller = br_poll_controller,
310#endif
Jiri Pirkoafc61512011-02-13 09:33:42 +0000311 .ndo_add_slave = br_add_slave,
312 .ndo_del_slave = br_del_slave,
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000313 .ndo_fix_features = br_fix_features,
John Fastabend77162022012-04-15 06:43:56 +0000314 .ndo_fdb_add = br_fdb_add,
315 .ndo_fdb_del = br_fdb_delete,
316 .ndo_fdb_dump = br_fdb_dump,
John Fastabende5a55a82012-10-24 08:12:57 +0000317 .ndo_bridge_getlink = br_getlink,
318 .ndo_bridge_setlink = br_setlink,
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800319};
320
stephen hemminger14bb4782010-03-02 13:32:09 +0000321static void br_dev_free(struct net_device *dev)
322{
323 struct net_bridge *br = netdev_priv(dev);
324
325 free_percpu(br->stats);
326 free_netdev(dev);
327}
328
stephen hemmingerbb900b22011-04-04 14:03:32 +0000329static struct device_type br_type = {
330 .name = "bridge",
331};
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333void br_dev_setup(struct net_device *dev)
334{
stephen hemmingerbb900b22011-04-04 14:03:32 +0000335 struct net_bridge *br = netdev_priv(dev);
336
Danny Kukawka7ce5d222012-02-15 06:45:40 +0000337 eth_hw_addr_random(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 ether_setup(dev);
339
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800340 dev->netdev_ops = &br_netdev_ops;
stephen hemminger14bb4782010-03-02 13:32:09 +0000341 dev->destructor = br_dev_free;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900342 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000343 SET_NETDEV_DEVTYPE(dev, &br_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 dev->tx_queue_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 dev->priv_flags = IFF_EBRIDGE;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800346
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900347 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
Michał Mirosław34324dc2011-11-15 15:29:55 +0000348 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000349 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
350 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
Michał Mirosław34324dc2011-11-15 15:29:55 +0000351 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000352 NETIF_F_HW_VLAN_TX;
stephen hemmingerbb900b22011-04-04 14:03:32 +0000353
354 br->dev = dev;
355 spin_lock_init(&br->lock);
356 INIT_LIST_HEAD(&br->port_list);
357 spin_lock_init(&br->hash_lock);
358
359 br->bridge_id.prio[0] = 0x80;
360 br->bridge_id.prio[1] = 0x00;
361
Ben Hutchings2bc80052012-11-01 09:12:02 +0000362 memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000363
stephen hemmingerbb900b22011-04-04 14:03:32 +0000364 br->stp_enabled = BR_NO_STP;
stephen hemminger515853c2011-10-03 18:14:46 +0000365 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
366
stephen hemmingerbb900b22011-04-04 14:03:32 +0000367 br->designated_root = br->bridge_id;
368 br->bridge_max_age = br->max_age = 20 * HZ;
369 br->bridge_hello_time = br->hello_time = 2 * HZ;
370 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
371 br->ageing_time = 300 * HZ;
372
373 br_netfilter_rtable_init(br);
374 br_stp_timer_init(br);
375 br_multicast_init(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}