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 /* net device transmit always called with BH disabled */
26 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
28 struct net_bridge *br = netdev_priv(dev);
29 const unsigned char *dest = skb->data;
30 struct net_bridge_fdb_entry *dst;
31 struct net_bridge_mdb_entry *mdst;
32 struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
35 #ifdef CONFIG_BRIDGE_NETFILTER
36 if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
37 br_nf_pre_routing_finish_bridge_slow(skb);
43 u64_stats_update_begin(&brstats->syncp);
44 brstats->tx_packets++;
45 brstats->tx_bytes += skb->len;
46 u64_stats_update_end(&brstats->syncp);
48 BR_INPUT_SKB_CB(skb)->brdev = dev;
50 skb_reset_mac_header(skb);
51 skb_pull(skb, ETH_HLEN);
53 if (is_broadcast_ether_addr(dest))
54 br_flood_deliver(br, skb);
55 else if (is_multicast_ether_addr(dest)) {
56 if (unlikely(netpoll_tx_running(dev))) {
57 br_flood_deliver(br, skb);
60 if (br_multicast_rcv(br, NULL, skb)) {
65 mdst = br_mdb_get(br, skb);
66 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
67 br_multicast_deliver(mdst, skb);
69 br_flood_deliver(br, skb);
70 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
71 br_deliver(dst->dst, skb);
73 br_flood_deliver(br, skb);
80 static int br_dev_init(struct net_device *dev)
82 struct net_bridge *br = netdev_priv(dev);
84 br->stats = alloc_percpu(struct br_cpu_netstats);
91 static int br_dev_open(struct net_device *dev)
93 struct net_bridge *br = netdev_priv(dev);
95 netdev_update_features(dev);
96 netif_start_queue(dev);
97 br_stp_enable_bridge(br);
98 br_multicast_open(br);
103 static void br_dev_set_multicast_list(struct net_device *dev)
107 static int br_dev_stop(struct net_device *dev)
109 struct net_bridge *br = netdev_priv(dev);
111 br_stp_disable_bridge(br);
112 br_multicast_stop(br);
114 netif_stop_queue(dev);
119 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
120 struct rtnl_link_stats64 *stats)
122 struct net_bridge *br = netdev_priv(dev);
123 struct br_cpu_netstats tmp, sum = { 0 };
126 for_each_possible_cpu(cpu) {
128 const struct br_cpu_netstats *bstats
129 = per_cpu_ptr(br->stats, cpu);
131 start = u64_stats_fetch_begin_bh(&bstats->syncp);
132 memcpy(&tmp, bstats, sizeof(tmp));
133 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
134 sum.tx_bytes += tmp.tx_bytes;
135 sum.tx_packets += tmp.tx_packets;
136 sum.rx_bytes += tmp.rx_bytes;
137 sum.rx_packets += tmp.rx_packets;
140 stats->tx_bytes = sum.tx_bytes;
141 stats->tx_packets = sum.tx_packets;
142 stats->rx_bytes = sum.rx_bytes;
143 stats->rx_packets = sum.rx_packets;
148 static int br_change_mtu(struct net_device *dev, int new_mtu)
150 struct net_bridge *br = netdev_priv(dev);
151 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
156 #ifdef CONFIG_BRIDGE_NETFILTER
157 /* remember the MTU in the rtable for PMTU */
158 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
164 /* Allow setting mac address to any valid ethernet address. */
165 static int br_set_mac_address(struct net_device *dev, void *p)
167 struct net_bridge *br = netdev_priv(dev);
168 struct sockaddr *addr = p;
170 if (!is_valid_ether_addr(addr->sa_data))
171 return -EADDRNOTAVAIL;
173 spin_lock_bh(&br->lock);
174 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
175 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
176 br_fdb_change_mac_address(br, addr->sa_data);
177 br_stp_change_bridge_id(br, addr->sa_data);
179 spin_unlock_bh(&br->lock);
184 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
186 strlcpy(info->driver, "bridge", sizeof(info->driver));
187 strlcpy(info->version, BR_VERSION, sizeof(info->version));
188 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
189 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
192 static netdev_features_t br_fix_features(struct net_device *dev,
193 netdev_features_t features)
195 struct net_bridge *br = netdev_priv(dev);
197 return br_features_recompute(br, features);
200 #ifdef CONFIG_NET_POLL_CONTROLLER
201 static void br_poll_controller(struct net_device *br_dev)
205 static void br_netpoll_cleanup(struct net_device *dev)
207 struct net_bridge *br = netdev_priv(dev);
208 struct net_bridge_port *p;
210 list_for_each_entry(p, &br->port_list, list)
211 br_netpoll_disable(p);
214 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
217 struct net_bridge *br = netdev_priv(dev);
218 struct net_bridge_port *p;
221 list_for_each_entry(p, &br->port_list, list) {
224 err = br_netpoll_enable(p, gfp);
233 br_netpoll_cleanup(dev);
237 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
242 np = kzalloc(sizeof(*p->np), gfp);
247 err = __netpoll_setup(np, p->dev, gfp);
259 void br_netpoll_disable(struct net_bridge_port *p)
261 struct netpoll *np = p->np;
268 __netpoll_free_async(np);
273 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
276 struct net_bridge *br = netdev_priv(dev);
278 return br_add_if(br, slave_dev);
281 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
283 struct net_bridge *br = netdev_priv(dev);
285 return br_del_if(br, slave_dev);
288 static const struct ethtool_ops br_ethtool_ops = {
289 .get_drvinfo = br_getinfo,
290 .get_link = ethtool_op_get_link,
293 static const struct net_device_ops br_netdev_ops = {
294 .ndo_open = br_dev_open,
295 .ndo_stop = br_dev_stop,
296 .ndo_init = br_dev_init,
297 .ndo_start_xmit = br_dev_xmit,
298 .ndo_get_stats64 = br_get_stats64,
299 .ndo_set_mac_address = br_set_mac_address,
300 .ndo_set_rx_mode = br_dev_set_multicast_list,
301 .ndo_change_mtu = br_change_mtu,
302 .ndo_do_ioctl = br_dev_ioctl,
303 #ifdef CONFIG_NET_POLL_CONTROLLER
304 .ndo_netpoll_setup = br_netpoll_setup,
305 .ndo_netpoll_cleanup = br_netpoll_cleanup,
306 .ndo_poll_controller = br_poll_controller,
308 .ndo_add_slave = br_add_slave,
309 .ndo_del_slave = br_del_slave,
310 .ndo_fix_features = br_fix_features,
311 .ndo_fdb_add = br_fdb_add,
312 .ndo_fdb_del = br_fdb_delete,
313 .ndo_fdb_dump = br_fdb_dump,
314 .ndo_bridge_getlink = br_getlink,
315 .ndo_bridge_setlink = br_setlink,
318 static void br_dev_free(struct net_device *dev)
320 struct net_bridge *br = netdev_priv(dev);
322 free_percpu(br->stats);
326 static struct device_type br_type = {
330 void br_dev_setup(struct net_device *dev)
332 struct net_bridge *br = netdev_priv(dev);
334 eth_hw_addr_random(dev);
337 dev->netdev_ops = &br_netdev_ops;
338 dev->destructor = br_dev_free;
339 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
340 SET_NETDEV_DEVTYPE(dev, &br_type);
341 dev->tx_queue_len = 0;
342 dev->priv_flags = IFF_EBRIDGE;
344 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
345 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | NETIF_F_LLTX |
346 NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
347 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
348 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
352 spin_lock_init(&br->lock);
353 INIT_LIST_HEAD(&br->port_list);
354 spin_lock_init(&br->hash_lock);
356 br->bridge_id.prio[0] = 0x80;
357 br->bridge_id.prio[1] = 0x00;
359 memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
361 br->stp_enabled = BR_NO_STP;
362 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
364 br->designated_root = br->bridge_id;
365 br->bridge_max_age = br->max_age = 20 * HZ;
366 br->bridge_hello_time = br->hello_time = 2 * HZ;
367 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
368 br->ageing_time = 300 * HZ;
370 br_netfilter_rtable_init(br);
371 br_stp_timer_init(br);
372 br_multicast_init(br);