3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
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.
14 #include <linux/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/netpoll.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/list.h>
20 #include <linux/netfilter_bridge.h>
22 #include <linux/uaccess.h>
23 #include "br_private.h"
25 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
26 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
28 const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
29 EXPORT_SYMBOL_GPL(nf_br_ops);
31 static struct lock_class_key bridge_netdev_addr_lock_key;
33 /* net device transmit always called with BH disabled */
34 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
36 struct net_bridge *br = netdev_priv(dev);
37 struct net_bridge_fdb_entry *dst;
38 struct net_bridge_mdb_entry *mdst;
39 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
40 const struct nf_br_ops *nf_ops;
41 const unsigned char *dest;
45 nf_ops = rcu_dereference(nf_br_ops);
46 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
51 u64_stats_update_begin(&brstats->syncp);
52 brstats->tx_packets++;
53 brstats->tx_bytes += skb->len;
54 u64_stats_update_end(&brstats->syncp);
56 #ifdef CONFIG_NET_SWITCHDEV
57 skb->offload_fwd_mark = 0;
59 BR_INPUT_SKB_CB(skb)->brdev = dev;
61 skb_reset_mac_header(skb);
62 skb_pull(skb, ETH_HLEN);
64 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
67 dest = eth_hdr(skb)->h_dest;
68 if (is_broadcast_ether_addr(dest)) {
69 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
70 } else if (is_multicast_ether_addr(dest)) {
71 if (unlikely(netpoll_tx_running(dev))) {
72 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
75 if (br_multicast_rcv(br, NULL, skb, vid)) {
80 mdst = br_mdb_get(br, skb, vid);
81 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
82 br_multicast_querier_exists(br, eth_hdr(skb)))
83 br_multicast_flood(mdst, skb, false, true);
85 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
86 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
87 br_forward(dst->dst, skb, false, true);
89 br_flood(br, skb, BR_PKT_UNICAST, false, true);
96 static void br_set_lockdep_class(struct net_device *dev)
98 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
101 static int br_dev_init(struct net_device *dev)
103 struct net_bridge *br = netdev_priv(dev);
106 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
110 err = br_vlan_init(br);
112 free_percpu(br->stats);
116 err = br_multicast_init_stats(br);
118 free_percpu(br->stats);
121 br_set_lockdep_class(dev);
126 static void br_dev_uninit(struct net_device *dev)
128 struct net_bridge *br = netdev_priv(dev);
130 br_multicast_dev_del(br);
131 br_multicast_uninit_stats(br);
133 free_percpu(br->stats);
136 static int br_dev_open(struct net_device *dev)
138 struct net_bridge *br = netdev_priv(dev);
140 netdev_update_features(dev);
141 netif_start_queue(dev);
142 br_stp_enable_bridge(br);
143 br_multicast_open(br);
148 static void br_dev_set_multicast_list(struct net_device *dev)
152 static void br_dev_change_rx_flags(struct net_device *dev, int change)
154 if (change & IFF_PROMISC)
155 br_manage_promisc(netdev_priv(dev));
158 static int br_dev_stop(struct net_device *dev)
160 struct net_bridge *br = netdev_priv(dev);
162 br_stp_disable_bridge(br);
163 br_multicast_stop(br);
165 netif_stop_queue(dev);
170 static void br_get_stats64(struct net_device *dev,
171 struct rtnl_link_stats64 *stats)
173 struct net_bridge *br = netdev_priv(dev);
174 struct pcpu_sw_netstats tmp, sum = { 0 };
177 for_each_possible_cpu(cpu) {
179 const struct pcpu_sw_netstats *bstats
180 = per_cpu_ptr(br->stats, cpu);
182 start = u64_stats_fetch_begin_irq(&bstats->syncp);
183 memcpy(&tmp, bstats, sizeof(tmp));
184 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
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;
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;
197 static int br_change_mtu(struct net_device *dev, int new_mtu)
199 struct net_bridge *br = netdev_priv(dev);
200 if (new_mtu > br_min_mtu(br))
205 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
206 /* remember the MTU in the rtable for PMTU */
207 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
213 /* Allow setting mac address to any valid ethernet address. */
214 static int br_set_mac_address(struct net_device *dev, void *p)
216 struct net_bridge *br = netdev_priv(dev);
217 struct sockaddr *addr = p;
219 if (!is_valid_ether_addr(addr->sa_data))
220 return -EADDRNOTAVAIL;
222 spin_lock_bh(&br->lock);
223 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
224 /* Mac address will be changed in br_stp_change_bridge_id(). */
225 br_stp_change_bridge_id(br, addr->sa_data);
227 spin_unlock_bh(&br->lock);
232 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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));
240 static netdev_features_t br_fix_features(struct net_device *dev,
241 netdev_features_t features)
243 struct net_bridge *br = netdev_priv(dev);
245 return br_features_recompute(br, features);
248 #ifdef CONFIG_NET_POLL_CONTROLLER
249 static void br_poll_controller(struct net_device *br_dev)
253 static void br_netpoll_cleanup(struct net_device *dev)
255 struct net_bridge *br = netdev_priv(dev);
256 struct net_bridge_port *p;
258 list_for_each_entry(p, &br->port_list, list)
259 br_netpoll_disable(p);
262 static int __br_netpoll_enable(struct net_bridge_port *p)
267 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
271 err = __netpoll_setup(np, p->dev);
281 int br_netpoll_enable(struct net_bridge_port *p)
283 if (!p->br->dev->npinfo)
286 return __br_netpoll_enable(p);
289 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
291 struct net_bridge *br = netdev_priv(dev);
292 struct net_bridge_port *p;
295 list_for_each_entry(p, &br->port_list, list) {
298 err = __br_netpoll_enable(p);
307 br_netpoll_cleanup(dev);
311 void br_netpoll_disable(struct net_bridge_port *p)
313 struct netpoll *np = p->np;
320 __netpoll_free_async(np);
325 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
328 struct net_bridge *br = netdev_priv(dev);
330 return br_add_if(br, slave_dev);
333 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
335 struct net_bridge *br = netdev_priv(dev);
337 return br_del_if(br, slave_dev);
340 static const struct ethtool_ops br_ethtool_ops = {
341 .get_drvinfo = br_getinfo,
342 .get_link = ethtool_op_get_link,
345 static const struct net_device_ops br_netdev_ops = {
346 .ndo_open = br_dev_open,
347 .ndo_stop = br_dev_stop,
348 .ndo_init = br_dev_init,
349 .ndo_uninit = br_dev_uninit,
350 .ndo_start_xmit = br_dev_xmit,
351 .ndo_get_stats64 = br_get_stats64,
352 .ndo_set_mac_address = br_set_mac_address,
353 .ndo_set_rx_mode = br_dev_set_multicast_list,
354 .ndo_change_rx_flags = br_dev_change_rx_flags,
355 .ndo_change_mtu = br_change_mtu,
356 .ndo_do_ioctl = br_dev_ioctl,
357 #ifdef CONFIG_NET_POLL_CONTROLLER
358 .ndo_netpoll_setup = br_netpoll_setup,
359 .ndo_netpoll_cleanup = br_netpoll_cleanup,
360 .ndo_poll_controller = br_poll_controller,
362 .ndo_add_slave = br_add_slave,
363 .ndo_del_slave = br_del_slave,
364 .ndo_fix_features = br_fix_features,
365 .ndo_fdb_add = br_fdb_add,
366 .ndo_fdb_del = br_fdb_delete,
367 .ndo_fdb_dump = br_fdb_dump,
368 .ndo_bridge_getlink = br_getlink,
369 .ndo_bridge_setlink = br_setlink,
370 .ndo_bridge_dellink = br_dellink,
371 .ndo_features_check = passthru_features_check,
374 static struct device_type br_type = {
378 void br_dev_setup(struct net_device *dev)
380 struct net_bridge *br = netdev_priv(dev);
382 eth_hw_addr_random(dev);
385 dev->netdev_ops = &br_netdev_ops;
386 dev->needs_free_netdev = true;
387 dev->ethtool_ops = &br_ethtool_ops;
388 SET_NETDEV_DEVTYPE(dev, &br_type);
389 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
391 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
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;
395 dev->vlan_features = COMMON_FEATURES;
398 spin_lock_init(&br->lock);
399 INIT_LIST_HEAD(&br->port_list);
400 spin_lock_init(&br->hash_lock);
402 br->bridge_id.prio[0] = 0x80;
403 br->bridge_id.prio[1] = 0x00;
405 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
407 br->stp_enabled = BR_NO_STP;
408 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
409 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
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;
415 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
416 dev->max_mtu = ETH_MAX_MTU;
418 br_netfilter_rtable_init(br);
419 br_stp_timer_init(br);
420 br_multicast_init(br);
421 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);