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 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 BR_INPUT_SKB_CB(skb)->brdev = dev;
58 skb_reset_mac_header(skb);
59 skb_pull(skb, ETH_HLEN);
61 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
64 if (is_broadcast_ether_addr(dest)) {
65 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
66 } else if (is_multicast_ether_addr(dest)) {
67 if (unlikely(netpoll_tx_running(dev))) {
68 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
71 if (br_multicast_rcv(br, NULL, skb, vid)) {
76 mdst = br_mdb_get(br, skb, vid);
77 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
78 br_multicast_querier_exists(br, eth_hdr(skb)))
79 br_multicast_flood(mdst, skb, false, true);
81 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
82 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
83 br_forward(dst->dst, skb, false, true);
85 br_flood(br, skb, BR_PKT_UNICAST, false, true);
92 static void br_set_lockdep_class(struct net_device *dev)
94 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
97 static int br_dev_init(struct net_device *dev)
99 struct net_bridge *br = netdev_priv(dev);
102 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
106 err = br_vlan_init(br);
108 free_percpu(br->stats);
112 err = br_multicast_init_stats(br);
114 free_percpu(br->stats);
117 br_set_lockdep_class(dev);
122 static int br_dev_open(struct net_device *dev)
124 struct net_bridge *br = netdev_priv(dev);
126 netdev_update_features(dev);
127 netif_start_queue(dev);
128 br_stp_enable_bridge(br);
129 br_multicast_open(br);
134 static void br_dev_set_multicast_list(struct net_device *dev)
138 static void br_dev_change_rx_flags(struct net_device *dev, int change)
140 if (change & IFF_PROMISC)
141 br_manage_promisc(netdev_priv(dev));
144 static int br_dev_stop(struct net_device *dev)
146 struct net_bridge *br = netdev_priv(dev);
148 br_stp_disable_bridge(br);
149 br_multicast_stop(br);
151 netif_stop_queue(dev);
156 static void br_get_stats64(struct net_device *dev,
157 struct rtnl_link_stats64 *stats)
159 struct net_bridge *br = netdev_priv(dev);
160 struct pcpu_sw_netstats tmp, sum = { 0 };
163 for_each_possible_cpu(cpu) {
165 const struct pcpu_sw_netstats *bstats
166 = per_cpu_ptr(br->stats, cpu);
168 start = u64_stats_fetch_begin_irq(&bstats->syncp);
169 memcpy(&tmp, bstats, sizeof(tmp));
170 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
171 sum.tx_bytes += tmp.tx_bytes;
172 sum.tx_packets += tmp.tx_packets;
173 sum.rx_bytes += tmp.rx_bytes;
174 sum.rx_packets += tmp.rx_packets;
177 stats->tx_bytes = sum.tx_bytes;
178 stats->tx_packets = sum.tx_packets;
179 stats->rx_bytes = sum.rx_bytes;
180 stats->rx_packets = sum.rx_packets;
183 static int br_change_mtu(struct net_device *dev, int new_mtu)
185 struct net_bridge *br = netdev_priv(dev);
186 if (new_mtu > br_min_mtu(br))
191 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
192 /* remember the MTU in the rtable for PMTU */
193 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
199 /* Allow setting mac address to any valid ethernet address. */
200 static int br_set_mac_address(struct net_device *dev, void *p)
202 struct net_bridge *br = netdev_priv(dev);
203 struct sockaddr *addr = p;
205 if (!is_valid_ether_addr(addr->sa_data))
206 return -EADDRNOTAVAIL;
208 spin_lock_bh(&br->lock);
209 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
210 /* Mac address will be changed in br_stp_change_bridge_id(). */
211 br_stp_change_bridge_id(br, addr->sa_data);
213 spin_unlock_bh(&br->lock);
218 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
220 strlcpy(info->driver, "bridge", sizeof(info->driver));
221 strlcpy(info->version, BR_VERSION, sizeof(info->version));
222 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
223 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
226 static netdev_features_t br_fix_features(struct net_device *dev,
227 netdev_features_t features)
229 struct net_bridge *br = netdev_priv(dev);
231 return br_features_recompute(br, features);
234 #ifdef CONFIG_NET_POLL_CONTROLLER
235 static void br_poll_controller(struct net_device *br_dev)
239 static void br_netpoll_cleanup(struct net_device *dev)
241 struct net_bridge *br = netdev_priv(dev);
242 struct net_bridge_port *p;
244 list_for_each_entry(p, &br->port_list, list)
245 br_netpoll_disable(p);
248 static int __br_netpoll_enable(struct net_bridge_port *p)
253 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
257 err = __netpoll_setup(np, p->dev);
267 int br_netpoll_enable(struct net_bridge_port *p)
269 if (!p->br->dev->npinfo)
272 return __br_netpoll_enable(p);
275 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
277 struct net_bridge *br = netdev_priv(dev);
278 struct net_bridge_port *p;
281 list_for_each_entry(p, &br->port_list, list) {
284 err = __br_netpoll_enable(p);
293 br_netpoll_cleanup(dev);
297 void br_netpoll_disable(struct net_bridge_port *p)
299 struct netpoll *np = p->np;
306 __netpoll_free_async(np);
311 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
314 struct net_bridge *br = netdev_priv(dev);
316 return br_add_if(br, slave_dev);
319 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
321 struct net_bridge *br = netdev_priv(dev);
323 return br_del_if(br, slave_dev);
326 static const struct ethtool_ops br_ethtool_ops = {
327 .get_drvinfo = br_getinfo,
328 .get_link = ethtool_op_get_link,
331 static const struct net_device_ops br_netdev_ops = {
332 .ndo_open = br_dev_open,
333 .ndo_stop = br_dev_stop,
334 .ndo_init = br_dev_init,
335 .ndo_start_xmit = br_dev_xmit,
336 .ndo_get_stats64 = br_get_stats64,
337 .ndo_set_mac_address = br_set_mac_address,
338 .ndo_set_rx_mode = br_dev_set_multicast_list,
339 .ndo_change_rx_flags = br_dev_change_rx_flags,
340 .ndo_change_mtu = br_change_mtu,
341 .ndo_do_ioctl = br_dev_ioctl,
342 #ifdef CONFIG_NET_POLL_CONTROLLER
343 .ndo_netpoll_setup = br_netpoll_setup,
344 .ndo_netpoll_cleanup = br_netpoll_cleanup,
345 .ndo_poll_controller = br_poll_controller,
347 .ndo_add_slave = br_add_slave,
348 .ndo_del_slave = br_del_slave,
349 .ndo_fix_features = br_fix_features,
350 .ndo_fdb_add = br_fdb_add,
351 .ndo_fdb_del = br_fdb_delete,
352 .ndo_fdb_dump = br_fdb_dump,
353 .ndo_bridge_getlink = br_getlink,
354 .ndo_bridge_setlink = br_setlink,
355 .ndo_bridge_dellink = br_dellink,
356 .ndo_features_check = passthru_features_check,
359 static void br_dev_free(struct net_device *dev)
361 struct net_bridge *br = netdev_priv(dev);
363 free_percpu(br->stats);
367 static struct device_type br_type = {
371 void br_dev_setup(struct net_device *dev)
373 struct net_bridge *br = netdev_priv(dev);
375 eth_hw_addr_random(dev);
378 dev->netdev_ops = &br_netdev_ops;
379 dev->destructor = br_dev_free;
380 dev->ethtool_ops = &br_ethtool_ops;
381 SET_NETDEV_DEVTYPE(dev, &br_type);
382 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
384 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
385 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
386 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
387 NETIF_F_HW_VLAN_STAG_TX;
388 dev->vlan_features = COMMON_FEATURES;
391 spin_lock_init(&br->lock);
392 INIT_LIST_HEAD(&br->port_list);
393 spin_lock_init(&br->hash_lock);
395 br->bridge_id.prio[0] = 0x80;
396 br->bridge_id.prio[1] = 0x00;
398 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
400 br->stp_enabled = BR_NO_STP;
401 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
402 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
404 br->designated_root = br->bridge_id;
405 br->bridge_max_age = br->max_age = 20 * HZ;
406 br->bridge_hello_time = br->hello_time = 2 * HZ;
407 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
408 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
409 dev->max_mtu = ETH_MAX_MTU;
411 br_netfilter_rtable_init(br);
412 br_stp_timer_init(br);
413 br_multicast_init(br);
414 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);