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 BR_INPUT_SKB_CB(skb)->brdev = dev;
53 skb_reset_mac_header(skb);
54 skb_pull(skb, ETH_HLEN);
56 u64_stats_update_begin(&brstats->syncp);
57 brstats->tx_packets++;
58 /* Exclude ETH_HLEN from byte stats for consistency with Rx chain */
59 brstats->tx_bytes += skb->len;
60 u64_stats_update_end(&brstats->syncp);
62 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
65 if (is_broadcast_ether_addr(dest))
66 br_flood_deliver(br, skb, false);
67 else if (is_multicast_ether_addr(dest)) {
68 if (unlikely(netpoll_tx_running(dev))) {
69 br_flood_deliver(br, skb, false);
72 if (br_multicast_rcv(br, NULL, skb, vid)) {
77 mdst = br_mdb_get(br, skb, vid);
78 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
79 br_multicast_querier_exists(br, eth_hdr(skb)))
80 br_multicast_deliver(mdst, skb);
82 br_flood_deliver(br, skb, false);
83 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
84 br_deliver(dst->dst, skb);
86 br_flood_deliver(br, skb, true);
93 static void br_set_lockdep_class(struct net_device *dev)
95 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
98 static int br_dev_init(struct net_device *dev)
100 struct net_bridge *br = netdev_priv(dev);
103 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
107 err = br_vlan_init(br);
109 free_percpu(br->stats);
110 br_set_lockdep_class(dev);
115 static int br_dev_open(struct net_device *dev)
117 struct net_bridge *br = netdev_priv(dev);
119 netdev_update_features(dev);
120 netif_start_queue(dev);
121 br_stp_enable_bridge(br);
122 br_multicast_open(br);
127 static void br_dev_set_multicast_list(struct net_device *dev)
131 static void br_dev_change_rx_flags(struct net_device *dev, int change)
133 if (change & IFF_PROMISC)
134 br_manage_promisc(netdev_priv(dev));
137 static int br_dev_stop(struct net_device *dev)
139 struct net_bridge *br = netdev_priv(dev);
141 br_stp_disable_bridge(br);
142 br_multicast_stop(br);
144 netif_stop_queue(dev);
149 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
150 struct rtnl_link_stats64 *stats)
152 struct net_bridge *br = netdev_priv(dev);
153 struct pcpu_sw_netstats tmp, sum = { 0 };
156 for_each_possible_cpu(cpu) {
158 const struct pcpu_sw_netstats *bstats
159 = per_cpu_ptr(br->stats, cpu);
161 start = u64_stats_fetch_begin_irq(&bstats->syncp);
162 memcpy(&tmp, bstats, sizeof(tmp));
163 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
164 sum.tx_bytes += tmp.tx_bytes;
165 sum.tx_packets += tmp.tx_packets;
166 sum.rx_bytes += tmp.rx_bytes;
167 sum.rx_packets += tmp.rx_packets;
170 stats->tx_bytes = sum.tx_bytes;
171 stats->tx_packets = sum.tx_packets;
172 stats->rx_bytes = sum.rx_bytes;
173 stats->rx_packets = sum.rx_packets;
178 static int br_change_mtu(struct net_device *dev, int new_mtu)
180 struct net_bridge *br = netdev_priv(dev);
181 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
186 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
187 /* remember the MTU in the rtable for PMTU */
188 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
194 /* Allow setting mac address to any valid ethernet address. */
195 static int br_set_mac_address(struct net_device *dev, void *p)
197 struct net_bridge *br = netdev_priv(dev);
198 struct sockaddr *addr = p;
200 if (!is_valid_ether_addr(addr->sa_data))
201 return -EADDRNOTAVAIL;
203 spin_lock_bh(&br->lock);
204 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
205 /* Mac address will be changed in br_stp_change_bridge_id(). */
206 br_stp_change_bridge_id(br, addr->sa_data);
208 spin_unlock_bh(&br->lock);
213 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
215 strlcpy(info->driver, "bridge", sizeof(info->driver));
216 strlcpy(info->version, BR_VERSION, sizeof(info->version));
217 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
218 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
221 static netdev_features_t br_fix_features(struct net_device *dev,
222 netdev_features_t features)
224 struct net_bridge *br = netdev_priv(dev);
226 return br_features_recompute(br, features);
229 #ifdef CONFIG_NET_POLL_CONTROLLER
230 static void br_poll_controller(struct net_device *br_dev)
234 static void br_netpoll_cleanup(struct net_device *dev)
236 struct net_bridge *br = netdev_priv(dev);
237 struct net_bridge_port *p;
239 list_for_each_entry(p, &br->port_list, list)
240 br_netpoll_disable(p);
243 static int __br_netpoll_enable(struct net_bridge_port *p)
248 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
252 err = __netpoll_setup(np, p->dev);
262 int br_netpoll_enable(struct net_bridge_port *p)
264 if (!p->br->dev->npinfo)
267 return __br_netpoll_enable(p);
270 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
272 struct net_bridge *br = netdev_priv(dev);
273 struct net_bridge_port *p;
276 list_for_each_entry(p, &br->port_list, list) {
279 err = __br_netpoll_enable(p);
288 br_netpoll_cleanup(dev);
292 void br_netpoll_disable(struct net_bridge_port *p)
294 struct netpoll *np = p->np;
301 __netpoll_free_async(np);
306 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
309 struct net_bridge *br = netdev_priv(dev);
311 return br_add_if(br, slave_dev);
314 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
316 struct net_bridge *br = netdev_priv(dev);
318 return br_del_if(br, slave_dev);
321 static const struct ethtool_ops br_ethtool_ops = {
322 .get_drvinfo = br_getinfo,
323 .get_link = ethtool_op_get_link,
326 static const struct net_device_ops br_netdev_ops = {
327 .ndo_open = br_dev_open,
328 .ndo_stop = br_dev_stop,
329 .ndo_init = br_dev_init,
330 .ndo_start_xmit = br_dev_xmit,
331 .ndo_get_stats64 = br_get_stats64,
332 .ndo_set_mac_address = br_set_mac_address,
333 .ndo_set_rx_mode = br_dev_set_multicast_list,
334 .ndo_change_rx_flags = br_dev_change_rx_flags,
335 .ndo_change_mtu = br_change_mtu,
336 .ndo_do_ioctl = br_dev_ioctl,
337 #ifdef CONFIG_NET_POLL_CONTROLLER
338 .ndo_netpoll_setup = br_netpoll_setup,
339 .ndo_netpoll_cleanup = br_netpoll_cleanup,
340 .ndo_poll_controller = br_poll_controller,
342 .ndo_add_slave = br_add_slave,
343 .ndo_del_slave = br_del_slave,
344 .ndo_fix_features = br_fix_features,
345 .ndo_fdb_add = br_fdb_add,
346 .ndo_fdb_del = br_fdb_delete,
347 .ndo_fdb_dump = br_fdb_dump,
348 .ndo_bridge_getlink = br_getlink,
349 .ndo_bridge_setlink = br_setlink,
350 .ndo_bridge_dellink = br_dellink,
351 .ndo_features_check = passthru_features_check,
354 static void br_dev_free(struct net_device *dev)
356 struct net_bridge *br = netdev_priv(dev);
358 free_percpu(br->stats);
362 static struct device_type br_type = {
366 void br_dev_setup(struct net_device *dev)
368 struct net_bridge *br = netdev_priv(dev);
370 eth_hw_addr_random(dev);
373 dev->netdev_ops = &br_netdev_ops;
374 dev->destructor = br_dev_free;
375 dev->ethtool_ops = &br_ethtool_ops;
376 SET_NETDEV_DEVTYPE(dev, &br_type);
377 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
379 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
380 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
381 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
382 NETIF_F_HW_VLAN_STAG_TX;
383 dev->vlan_features = COMMON_FEATURES;
386 spin_lock_init(&br->lock);
387 INIT_LIST_HEAD(&br->port_list);
388 spin_lock_init(&br->hash_lock);
390 br->bridge_id.prio[0] = 0x80;
391 br->bridge_id.prio[1] = 0x00;
393 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
395 br->stp_enabled = BR_NO_STP;
396 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
397 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
399 br->designated_root = br->bridge_id;
400 br->bridge_max_age = br->max_age = 20 * HZ;
401 br->bridge_hello_time = br->hello_time = 2 * HZ;
402 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
403 br->ageing_time = BR_DEFAULT_AGEING_TIME;
405 br_netfilter_rtable_init(br);
406 br_stp_timer_init(br);
407 br_multicast_init(br);