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 /* net device transmit always called with BH disabled */
29 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
31 struct net_bridge *br = netdev_priv(dev);
32 const unsigned char *dest = skb->data;
33 struct net_bridge_fdb_entry *dst;
34 struct net_bridge_mdb_entry *mdst;
35 struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
39 #ifdef CONFIG_BRIDGE_NETFILTER
40 if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
41 br_nf_pre_routing_finish_bridge_slow(skb);
47 u64_stats_update_begin(&brstats->syncp);
48 brstats->tx_packets++;
49 brstats->tx_bytes += skb->len;
50 u64_stats_update_end(&brstats->syncp);
52 if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
55 BR_INPUT_SKB_CB(skb)->brdev = dev;
57 skb_reset_mac_header(skb);
58 skb_pull(skb, ETH_HLEN);
60 if (is_broadcast_ether_addr(dest))
61 br_flood_deliver(br, skb, false);
62 else if (is_multicast_ether_addr(dest)) {
63 if (unlikely(netpoll_tx_running(dev))) {
64 br_flood_deliver(br, skb, false);
67 if (br_multicast_rcv(br, NULL, skb)) {
72 mdst = br_mdb_get(br, skb, vid);
73 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
74 br_multicast_deliver(mdst, skb);
76 br_flood_deliver(br, skb, false);
77 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
78 br_deliver(dst->dst, skb);
80 br_flood_deliver(br, skb, true);
87 static int br_dev_init(struct net_device *dev)
89 struct net_bridge *br = netdev_priv(dev);
91 br->stats = alloc_percpu(struct br_cpu_netstats);
98 static int br_dev_open(struct net_device *dev)
100 struct net_bridge *br = netdev_priv(dev);
102 netdev_update_features(dev);
103 netif_start_queue(dev);
104 br_stp_enable_bridge(br);
105 br_multicast_open(br);
110 static void br_dev_set_multicast_list(struct net_device *dev)
114 static int br_dev_stop(struct net_device *dev)
116 struct net_bridge *br = netdev_priv(dev);
118 br_stp_disable_bridge(br);
119 br_multicast_stop(br);
121 netif_stop_queue(dev);
126 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
127 struct rtnl_link_stats64 *stats)
129 struct net_bridge *br = netdev_priv(dev);
130 struct br_cpu_netstats tmp, sum = { 0 };
133 for_each_possible_cpu(cpu) {
135 const struct br_cpu_netstats *bstats
136 = per_cpu_ptr(br->stats, cpu);
138 start = u64_stats_fetch_begin_bh(&bstats->syncp);
139 memcpy(&tmp, bstats, sizeof(tmp));
140 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
141 sum.tx_bytes += tmp.tx_bytes;
142 sum.tx_packets += tmp.tx_packets;
143 sum.rx_bytes += tmp.rx_bytes;
144 sum.rx_packets += tmp.rx_packets;
147 stats->tx_bytes = sum.tx_bytes;
148 stats->tx_packets = sum.tx_packets;
149 stats->rx_bytes = sum.rx_bytes;
150 stats->rx_packets = sum.rx_packets;
155 static int br_change_mtu(struct net_device *dev, int new_mtu)
157 struct net_bridge *br = netdev_priv(dev);
158 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
163 #ifdef CONFIG_BRIDGE_NETFILTER
164 /* remember the MTU in the rtable for PMTU */
165 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
171 /* Allow setting mac address to any valid ethernet address. */
172 static int br_set_mac_address(struct net_device *dev, void *p)
174 struct net_bridge *br = netdev_priv(dev);
175 struct sockaddr *addr = p;
177 if (!is_valid_ether_addr(addr->sa_data))
178 return -EADDRNOTAVAIL;
180 spin_lock_bh(&br->lock);
181 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
182 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
183 br_fdb_change_mac_address(br, addr->sa_data);
184 br_stp_change_bridge_id(br, addr->sa_data);
186 spin_unlock_bh(&br->lock);
191 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
193 strlcpy(info->driver, "bridge", sizeof(info->driver));
194 strlcpy(info->version, BR_VERSION, sizeof(info->version));
195 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
196 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
199 static netdev_features_t br_fix_features(struct net_device *dev,
200 netdev_features_t features)
202 struct net_bridge *br = netdev_priv(dev);
204 return br_features_recompute(br, features);
207 #ifdef CONFIG_NET_POLL_CONTROLLER
208 static void br_poll_controller(struct net_device *br_dev)
212 static void br_netpoll_cleanup(struct net_device *dev)
214 struct net_bridge *br = netdev_priv(dev);
215 struct net_bridge_port *p;
217 list_for_each_entry(p, &br->port_list, list)
218 br_netpoll_disable(p);
221 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
224 struct net_bridge *br = netdev_priv(dev);
225 struct net_bridge_port *p;
228 list_for_each_entry(p, &br->port_list, list) {
231 err = br_netpoll_enable(p, gfp);
240 br_netpoll_cleanup(dev);
244 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
249 if (!p->br->dev->npinfo)
252 np = kzalloc(sizeof(*p->np), gfp);
256 err = __netpoll_setup(np, p->dev, gfp);
266 void br_netpoll_disable(struct net_bridge_port *p)
268 struct netpoll *np = p->np;
275 __netpoll_free_async(np);
280 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
283 struct net_bridge *br = netdev_priv(dev);
285 return br_add_if(br, slave_dev);
288 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
290 struct net_bridge *br = netdev_priv(dev);
292 return br_del_if(br, slave_dev);
295 static const struct ethtool_ops br_ethtool_ops = {
296 .get_drvinfo = br_getinfo,
297 .get_link = ethtool_op_get_link,
300 static const struct net_device_ops br_netdev_ops = {
301 .ndo_open = br_dev_open,
302 .ndo_stop = br_dev_stop,
303 .ndo_init = br_dev_init,
304 .ndo_start_xmit = br_dev_xmit,
305 .ndo_get_stats64 = br_get_stats64,
306 .ndo_set_mac_address = br_set_mac_address,
307 .ndo_set_rx_mode = br_dev_set_multicast_list,
308 .ndo_change_mtu = br_change_mtu,
309 .ndo_do_ioctl = br_dev_ioctl,
310 #ifdef CONFIG_NET_POLL_CONTROLLER
311 .ndo_netpoll_setup = br_netpoll_setup,
312 .ndo_netpoll_cleanup = br_netpoll_cleanup,
313 .ndo_poll_controller = br_poll_controller,
315 .ndo_add_slave = br_add_slave,
316 .ndo_del_slave = br_del_slave,
317 .ndo_fix_features = br_fix_features,
318 .ndo_fdb_add = br_fdb_add,
319 .ndo_fdb_del = br_fdb_delete,
320 .ndo_fdb_dump = br_fdb_dump,
321 .ndo_bridge_getlink = br_getlink,
322 .ndo_bridge_setlink = br_setlink,
323 .ndo_bridge_dellink = br_dellink,
326 static void br_dev_free(struct net_device *dev)
328 struct net_bridge *br = netdev_priv(dev);
330 free_percpu(br->stats);
334 static struct device_type br_type = {
338 void br_dev_setup(struct net_device *dev)
340 struct net_bridge *br = netdev_priv(dev);
342 eth_hw_addr_random(dev);
345 dev->netdev_ops = &br_netdev_ops;
346 dev->destructor = br_dev_free;
347 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
348 SET_NETDEV_DEVTYPE(dev, &br_type);
349 dev->tx_queue_len = 0;
350 dev->priv_flags = IFF_EBRIDGE;
352 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
353 NETIF_F_HW_VLAN_CTAG_TX;
354 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
355 dev->vlan_features = COMMON_FEATURES;
358 spin_lock_init(&br->lock);
359 INIT_LIST_HEAD(&br->port_list);
360 spin_lock_init(&br->hash_lock);
362 br->bridge_id.prio[0] = 0x80;
363 br->bridge_id.prio[1] = 0x00;
365 memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
367 br->stp_enabled = BR_NO_STP;
368 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
370 br->designated_root = br->bridge_id;
371 br->bridge_max_age = br->max_age = 20 * HZ;
372 br->bridge_hello_time = br->hello_time = 2 * HZ;
373 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
374 br->ageing_time = 300 * HZ;
376 br_netfilter_rtable_init(br);
377 br_stp_timer_init(br);
378 br_multicast_init(br);