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;
46 nf_ops = rcu_dereference(nf_br_ops);
47 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
52 u64_stats_update_begin(&brstats->syncp);
53 brstats->tx_packets++;
54 brstats->tx_bytes += skb->len;
55 u64_stats_update_end(&brstats->syncp);
57 br_switchdev_frame_unmark(skb);
58 BR_INPUT_SKB_CB(skb)->brdev = dev;
60 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_ENABLED(CONFIG_INET) &&
68 (eth->h_proto == htons(ETH_P_ARP) ||
69 eth->h_proto == htons(ETH_P_RARP)) &&
70 br->neigh_suppress_enabled) {
71 br_do_proxy_suppress_arp(skb, br, vid, NULL);
74 dest = eth_hdr(skb)->h_dest;
75 if (is_broadcast_ether_addr(dest)) {
76 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
77 } else if (is_multicast_ether_addr(dest)) {
78 if (unlikely(netpoll_tx_running(dev))) {
79 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
82 if (br_multicast_rcv(br, NULL, skb, vid)) {
87 mdst = br_mdb_get(br, skb, vid);
88 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
89 br_multicast_querier_exists(br, eth_hdr(skb)))
90 br_multicast_flood(mdst, skb, false, true);
92 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
93 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
94 br_forward(dst->dst, skb, false, true);
96 br_flood(br, skb, BR_PKT_UNICAST, false, true);
103 static void br_set_lockdep_class(struct net_device *dev)
105 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
108 static int br_dev_init(struct net_device *dev)
110 struct net_bridge *br = netdev_priv(dev);
113 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
117 err = br_vlan_init(br);
119 free_percpu(br->stats);
123 err = br_multicast_init_stats(br);
125 free_percpu(br->stats);
128 br_set_lockdep_class(dev);
133 static void br_dev_uninit(struct net_device *dev)
135 struct net_bridge *br = netdev_priv(dev);
137 br_multicast_dev_del(br);
138 br_multicast_uninit_stats(br);
140 free_percpu(br->stats);
143 static int br_dev_open(struct net_device *dev)
145 struct net_bridge *br = netdev_priv(dev);
147 netdev_update_features(dev);
148 netif_start_queue(dev);
149 br_stp_enable_bridge(br);
150 br_multicast_open(br);
155 static void br_dev_set_multicast_list(struct net_device *dev)
159 static void br_dev_change_rx_flags(struct net_device *dev, int change)
161 if (change & IFF_PROMISC)
162 br_manage_promisc(netdev_priv(dev));
165 static int br_dev_stop(struct net_device *dev)
167 struct net_bridge *br = netdev_priv(dev);
169 br_stp_disable_bridge(br);
170 br_multicast_stop(br);
172 netif_stop_queue(dev);
177 static void br_get_stats64(struct net_device *dev,
178 struct rtnl_link_stats64 *stats)
180 struct net_bridge *br = netdev_priv(dev);
181 struct pcpu_sw_netstats tmp, sum = { 0 };
184 for_each_possible_cpu(cpu) {
186 const struct pcpu_sw_netstats *bstats
187 = per_cpu_ptr(br->stats, cpu);
189 start = u64_stats_fetch_begin_irq(&bstats->syncp);
190 memcpy(&tmp, bstats, sizeof(tmp));
191 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
192 sum.tx_bytes += tmp.tx_bytes;
193 sum.tx_packets += tmp.tx_packets;
194 sum.rx_bytes += tmp.rx_bytes;
195 sum.rx_packets += tmp.rx_packets;
198 stats->tx_bytes = sum.tx_bytes;
199 stats->tx_packets = sum.tx_packets;
200 stats->rx_bytes = sum.rx_bytes;
201 stats->rx_packets = sum.rx_packets;
204 static int br_change_mtu(struct net_device *dev, int new_mtu)
206 struct net_bridge *br = netdev_priv(dev);
207 if (new_mtu > br_min_mtu(br))
212 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
213 /* remember the MTU in the rtable for PMTU */
214 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
220 /* Allow setting mac address to any valid ethernet address. */
221 static int br_set_mac_address(struct net_device *dev, void *p)
223 struct net_bridge *br = netdev_priv(dev);
224 struct sockaddr *addr = p;
226 if (!is_valid_ether_addr(addr->sa_data))
227 return -EADDRNOTAVAIL;
229 spin_lock_bh(&br->lock);
230 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
231 /* Mac address will be changed in br_stp_change_bridge_id(). */
232 br_stp_change_bridge_id(br, addr->sa_data);
234 spin_unlock_bh(&br->lock);
239 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
241 strlcpy(info->driver, "bridge", sizeof(info->driver));
242 strlcpy(info->version, BR_VERSION, sizeof(info->version));
243 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
244 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
247 static netdev_features_t br_fix_features(struct net_device *dev,
248 netdev_features_t features)
250 struct net_bridge *br = netdev_priv(dev);
252 return br_features_recompute(br, features);
255 #ifdef CONFIG_NET_POLL_CONTROLLER
256 static void br_poll_controller(struct net_device *br_dev)
260 static void br_netpoll_cleanup(struct net_device *dev)
262 struct net_bridge *br = netdev_priv(dev);
263 struct net_bridge_port *p;
265 list_for_each_entry(p, &br->port_list, list)
266 br_netpoll_disable(p);
269 static int __br_netpoll_enable(struct net_bridge_port *p)
274 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
278 err = __netpoll_setup(np, p->dev);
288 int br_netpoll_enable(struct net_bridge_port *p)
290 if (!p->br->dev->npinfo)
293 return __br_netpoll_enable(p);
296 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
298 struct net_bridge *br = netdev_priv(dev);
299 struct net_bridge_port *p;
302 list_for_each_entry(p, &br->port_list, list) {
305 err = __br_netpoll_enable(p);
314 br_netpoll_cleanup(dev);
318 void br_netpoll_disable(struct net_bridge_port *p)
320 struct netpoll *np = p->np;
327 __netpoll_free_async(np);
332 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
333 struct netlink_ext_ack *extack)
336 struct net_bridge *br = netdev_priv(dev);
338 return br_add_if(br, slave_dev, extack);
341 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
343 struct net_bridge *br = netdev_priv(dev);
345 return br_del_if(br, slave_dev);
348 static const struct ethtool_ops br_ethtool_ops = {
349 .get_drvinfo = br_getinfo,
350 .get_link = ethtool_op_get_link,
353 static const struct net_device_ops br_netdev_ops = {
354 .ndo_open = br_dev_open,
355 .ndo_stop = br_dev_stop,
356 .ndo_init = br_dev_init,
357 .ndo_uninit = br_dev_uninit,
358 .ndo_start_xmit = br_dev_xmit,
359 .ndo_get_stats64 = br_get_stats64,
360 .ndo_set_mac_address = br_set_mac_address,
361 .ndo_set_rx_mode = br_dev_set_multicast_list,
362 .ndo_change_rx_flags = br_dev_change_rx_flags,
363 .ndo_change_mtu = br_change_mtu,
364 .ndo_do_ioctl = br_dev_ioctl,
365 #ifdef CONFIG_NET_POLL_CONTROLLER
366 .ndo_netpoll_setup = br_netpoll_setup,
367 .ndo_netpoll_cleanup = br_netpoll_cleanup,
368 .ndo_poll_controller = br_poll_controller,
370 .ndo_add_slave = br_add_slave,
371 .ndo_del_slave = br_del_slave,
372 .ndo_fix_features = br_fix_features,
373 .ndo_fdb_add = br_fdb_add,
374 .ndo_fdb_del = br_fdb_delete,
375 .ndo_fdb_dump = br_fdb_dump,
376 .ndo_bridge_getlink = br_getlink,
377 .ndo_bridge_setlink = br_setlink,
378 .ndo_bridge_dellink = br_dellink,
379 .ndo_features_check = passthru_features_check,
382 static struct device_type br_type = {
386 void br_dev_setup(struct net_device *dev)
388 struct net_bridge *br = netdev_priv(dev);
390 eth_hw_addr_random(dev);
393 dev->netdev_ops = &br_netdev_ops;
394 dev->needs_free_netdev = true;
395 dev->ethtool_ops = &br_ethtool_ops;
396 SET_NETDEV_DEVTYPE(dev, &br_type);
397 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
399 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
400 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
401 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
402 NETIF_F_HW_VLAN_STAG_TX;
403 dev->vlan_features = COMMON_FEATURES;
406 spin_lock_init(&br->lock);
407 INIT_LIST_HEAD(&br->port_list);
408 spin_lock_init(&br->hash_lock);
410 br->bridge_id.prio[0] = 0x80;
411 br->bridge_id.prio[1] = 0x00;
413 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
415 br->stp_enabled = BR_NO_STP;
416 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
417 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
419 br->designated_root = br->bridge_id;
420 br->bridge_max_age = br->max_age = 20 * HZ;
421 br->bridge_hello_time = br->hello_time = 2 * HZ;
422 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
423 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
424 dev->max_mtu = ETH_MAX_MTU;
426 br_netfilter_rtable_init(br);
427 br_stp_timer_init(br);
428 br_multicast_init(br);
429 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);