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 <asm/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 const unsigned char *dest = skb->data;
38 struct net_bridge_fdb_entry *dst;
39 struct net_bridge_mdb_entry *mdst;
40 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
41 const struct nf_br_ops *nf_ops;
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 if (is_broadcast_ether_addr(dest)) {
68 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
69 } else if (is_multicast_ether_addr(dest)) {
70 if (unlikely(netpoll_tx_running(dev))) {
71 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
74 if (br_multicast_rcv(br, NULL, skb, vid)) {
79 mdst = br_mdb_get(br, skb, vid);
80 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
81 br_multicast_querier_exists(br, eth_hdr(skb)))
82 br_multicast_flood(mdst, skb, false, true);
84 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
85 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) {
86 br_forward(dst->dst, skb, false, true);
88 br_flood(br, skb, BR_PKT_UNICAST, false, true);
95 static void br_set_lockdep_class(struct net_device *dev)
97 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
100 static int br_dev_init(struct net_device *dev)
102 struct net_bridge *br = netdev_priv(dev);
105 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
109 err = br_vlan_init(br);
111 free_percpu(br->stats);
115 err = br_multicast_init_stats(br);
117 free_percpu(br->stats);
120 br_set_lockdep_class(dev);
125 static int br_dev_open(struct net_device *dev)
127 struct net_bridge *br = netdev_priv(dev);
129 netdev_update_features(dev);
130 netif_start_queue(dev);
131 br_stp_enable_bridge(br);
132 br_multicast_open(br);
137 static void br_dev_set_multicast_list(struct net_device *dev)
141 static void br_dev_change_rx_flags(struct net_device *dev, int change)
143 if (change & IFF_PROMISC)
144 br_manage_promisc(netdev_priv(dev));
147 static int br_dev_stop(struct net_device *dev)
149 struct net_bridge *br = netdev_priv(dev);
151 br_stp_disable_bridge(br);
152 br_multicast_stop(br);
154 netif_stop_queue(dev);
159 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
160 struct rtnl_link_stats64 *stats)
162 struct net_bridge *br = netdev_priv(dev);
163 struct pcpu_sw_netstats tmp, sum = { 0 };
166 for_each_possible_cpu(cpu) {
168 const struct pcpu_sw_netstats *bstats
169 = per_cpu_ptr(br->stats, cpu);
171 start = u64_stats_fetch_begin_irq(&bstats->syncp);
172 memcpy(&tmp, bstats, sizeof(tmp));
173 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
174 sum.tx_bytes += tmp.tx_bytes;
175 sum.tx_packets += tmp.tx_packets;
176 sum.rx_bytes += tmp.rx_bytes;
177 sum.rx_packets += tmp.rx_packets;
180 netdev_stats_to_stats64(stats, &dev->stats);
181 stats->tx_bytes = sum.tx_bytes;
182 stats->tx_packets = sum.tx_packets;
183 stats->rx_bytes = sum.rx_bytes;
184 stats->rx_packets = sum.rx_packets;
189 static int br_change_mtu(struct net_device *dev, int new_mtu)
191 struct net_bridge *br = netdev_priv(dev);
192 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
197 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
198 /* remember the MTU in the rtable for PMTU */
199 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
205 /* Allow setting mac address to any valid ethernet address. */
206 static int br_set_mac_address(struct net_device *dev, void *p)
208 struct net_bridge *br = netdev_priv(dev);
209 struct sockaddr *addr = p;
211 if (!is_valid_ether_addr(addr->sa_data))
212 return -EADDRNOTAVAIL;
214 /* dev_set_mac_addr() can be called by a master device on bridge's
215 * NETDEV_UNREGISTER, but since it's being destroyed do nothing
217 if (dev->reg_state != NETREG_REGISTERED)
220 spin_lock_bh(&br->lock);
221 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
222 /* Mac address will be changed in br_stp_change_bridge_id(). */
223 br_stp_change_bridge_id(br, addr->sa_data);
225 spin_unlock_bh(&br->lock);
230 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
232 strlcpy(info->driver, "bridge", sizeof(info->driver));
233 strlcpy(info->version, BR_VERSION, sizeof(info->version));
234 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
235 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
238 static netdev_features_t br_fix_features(struct net_device *dev,
239 netdev_features_t features)
241 struct net_bridge *br = netdev_priv(dev);
243 return br_features_recompute(br, features);
246 #ifdef CONFIG_NET_POLL_CONTROLLER
247 static void br_poll_controller(struct net_device *br_dev)
251 static void br_netpoll_cleanup(struct net_device *dev)
253 struct net_bridge *br = netdev_priv(dev);
254 struct net_bridge_port *p;
256 list_for_each_entry(p, &br->port_list, list)
257 br_netpoll_disable(p);
260 static int __br_netpoll_enable(struct net_bridge_port *p)
265 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
269 err = __netpoll_setup(np, p->dev);
279 int br_netpoll_enable(struct net_bridge_port *p)
281 if (!p->br->dev->npinfo)
284 return __br_netpoll_enable(p);
287 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
289 struct net_bridge *br = netdev_priv(dev);
290 struct net_bridge_port *p;
293 list_for_each_entry(p, &br->port_list, list) {
296 err = __br_netpoll_enable(p);
305 br_netpoll_cleanup(dev);
309 void br_netpoll_disable(struct net_bridge_port *p)
311 struct netpoll *np = p->np;
318 __netpoll_free_async(np);
323 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
326 struct net_bridge *br = netdev_priv(dev);
328 return br_add_if(br, slave_dev);
331 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
333 struct net_bridge *br = netdev_priv(dev);
335 return br_del_if(br, slave_dev);
338 static const struct ethtool_ops br_ethtool_ops = {
339 .get_drvinfo = br_getinfo,
340 .get_link = ethtool_op_get_link,
343 static const struct net_device_ops br_netdev_ops = {
344 .ndo_open = br_dev_open,
345 .ndo_stop = br_dev_stop,
346 .ndo_init = br_dev_init,
347 .ndo_start_xmit = br_dev_xmit,
348 .ndo_get_stats64 = br_get_stats64,
349 .ndo_set_mac_address = br_set_mac_address,
350 .ndo_set_rx_mode = br_dev_set_multicast_list,
351 .ndo_change_rx_flags = br_dev_change_rx_flags,
352 .ndo_change_mtu = br_change_mtu,
353 .ndo_do_ioctl = br_dev_ioctl,
354 #ifdef CONFIG_NET_POLL_CONTROLLER
355 .ndo_netpoll_setup = br_netpoll_setup,
356 .ndo_netpoll_cleanup = br_netpoll_cleanup,
357 .ndo_poll_controller = br_poll_controller,
359 .ndo_add_slave = br_add_slave,
360 .ndo_del_slave = br_del_slave,
361 .ndo_fix_features = br_fix_features,
362 .ndo_neigh_construct = netdev_default_l2upper_neigh_construct,
363 .ndo_neigh_destroy = netdev_default_l2upper_neigh_destroy,
364 .ndo_fdb_add = br_fdb_add,
365 .ndo_fdb_del = br_fdb_delete,
366 .ndo_fdb_dump = br_fdb_dump,
367 .ndo_bridge_getlink = br_getlink,
368 .ndo_bridge_setlink = br_setlink,
369 .ndo_bridge_dellink = br_dellink,
370 .ndo_features_check = passthru_features_check,
373 static void br_dev_free(struct net_device *dev)
375 struct net_bridge *br = netdev_priv(dev);
377 free_percpu(br->stats);
381 static struct device_type br_type = {
385 void br_dev_setup(struct net_device *dev)
387 struct net_bridge *br = netdev_priv(dev);
389 eth_hw_addr_random(dev);
392 dev->netdev_ops = &br_netdev_ops;
393 dev->destructor = br_dev_free;
394 dev->ethtool_ops = &br_ethtool_ops;
395 SET_NETDEV_DEVTYPE(dev, &br_type);
396 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
398 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
399 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
400 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
401 NETIF_F_HW_VLAN_STAG_TX;
402 dev->vlan_features = COMMON_FEATURES;
405 spin_lock_init(&br->lock);
406 INIT_LIST_HEAD(&br->port_list);
407 spin_lock_init(&br->hash_lock);
409 br->bridge_id.prio[0] = 0x80;
410 br->bridge_id.prio[1] = 0x00;
412 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
414 br->stp_enabled = BR_NO_STP;
415 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
416 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
418 br->designated_root = br->bridge_id;
419 br->bridge_max_age = br->max_age = 20 * HZ;
420 br->bridge_hello_time = br->hello_time = 2 * HZ;
421 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
422 br->ageing_time = BR_DEFAULT_AGEING_TIME;
424 br_netfilter_rtable_init(br);
425 br_stp_timer_init(br);
426 br_multicast_init(br);