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 pcpu_sw_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 BR_INPUT_SKB_CB(skb)->brdev = dev;
54 skb_reset_mac_header(skb);
55 skb_pull(skb, ETH_HLEN);
57 if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid))
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, vid)) {
72 mdst = br_mdb_get(br, skb, vid);
73 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
74 br_multicast_querier_exists(br, eth_hdr(skb)))
75 br_multicast_deliver(mdst, skb);
77 br_flood_deliver(br, skb, false);
78 } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
79 br_deliver(dst->dst, skb);
81 br_flood_deliver(br, skb, true);
88 static int br_dev_init(struct net_device *dev)
90 struct net_bridge *br = netdev_priv(dev);
92 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
99 static int br_dev_open(struct net_device *dev)
101 struct net_bridge *br = netdev_priv(dev);
103 netdev_update_features(dev);
104 netif_start_queue(dev);
105 br_stp_enable_bridge(br);
106 br_multicast_open(br);
111 static void br_dev_set_multicast_list(struct net_device *dev)
115 static void br_dev_change_rx_flags(struct net_device *dev, int change)
117 if (change & IFF_PROMISC)
118 br_manage_promisc(netdev_priv(dev));
121 static int br_dev_stop(struct net_device *dev)
123 struct net_bridge *br = netdev_priv(dev);
125 br_stp_disable_bridge(br);
126 br_multicast_stop(br);
128 netif_stop_queue(dev);
133 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
134 struct rtnl_link_stats64 *stats)
136 struct net_bridge *br = netdev_priv(dev);
137 struct pcpu_sw_netstats tmp, sum = { 0 };
140 for_each_possible_cpu(cpu) {
142 const struct pcpu_sw_netstats *bstats
143 = per_cpu_ptr(br->stats, cpu);
145 start = u64_stats_fetch_begin_irq(&bstats->syncp);
146 memcpy(&tmp, bstats, sizeof(tmp));
147 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
148 sum.tx_bytes += tmp.tx_bytes;
149 sum.tx_packets += tmp.tx_packets;
150 sum.rx_bytes += tmp.rx_bytes;
151 sum.rx_packets += tmp.rx_packets;
154 stats->tx_bytes = sum.tx_bytes;
155 stats->tx_packets = sum.tx_packets;
156 stats->rx_bytes = sum.rx_bytes;
157 stats->rx_packets = sum.rx_packets;
162 static int br_change_mtu(struct net_device *dev, int new_mtu)
164 struct net_bridge *br = netdev_priv(dev);
165 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
170 #ifdef CONFIG_BRIDGE_NETFILTER
171 /* remember the MTU in the rtable for PMTU */
172 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
178 /* Allow setting mac address to any valid ethernet address. */
179 static int br_set_mac_address(struct net_device *dev, void *p)
181 struct net_bridge *br = netdev_priv(dev);
182 struct sockaddr *addr = p;
184 if (!is_valid_ether_addr(addr->sa_data))
185 return -EADDRNOTAVAIL;
187 spin_lock_bh(&br->lock);
188 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
189 /* Mac address will be changed in br_stp_change_bridge_id(). */
190 br_stp_change_bridge_id(br, addr->sa_data);
192 spin_unlock_bh(&br->lock);
197 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
199 strlcpy(info->driver, "bridge", sizeof(info->driver));
200 strlcpy(info->version, BR_VERSION, sizeof(info->version));
201 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
202 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
205 static netdev_features_t br_fix_features(struct net_device *dev,
206 netdev_features_t features)
208 struct net_bridge *br = netdev_priv(dev);
210 return br_features_recompute(br, features);
213 #ifdef CONFIG_NET_POLL_CONTROLLER
214 static void br_poll_controller(struct net_device *br_dev)
218 static void br_netpoll_cleanup(struct net_device *dev)
220 struct net_bridge *br = netdev_priv(dev);
221 struct net_bridge_port *p;
223 list_for_each_entry(p, &br->port_list, list)
224 br_netpoll_disable(p);
227 static int __br_netpoll_enable(struct net_bridge_port *p)
232 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
236 err = __netpoll_setup(np, p->dev);
246 int br_netpoll_enable(struct net_bridge_port *p)
248 if (!p->br->dev->npinfo)
251 return __br_netpoll_enable(p);
254 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
256 struct net_bridge *br = netdev_priv(dev);
257 struct net_bridge_port *p;
260 list_for_each_entry(p, &br->port_list, list) {
263 err = __br_netpoll_enable(p);
272 br_netpoll_cleanup(dev);
276 void br_netpoll_disable(struct net_bridge_port *p)
278 struct netpoll *np = p->np;
285 __netpoll_free_async(np);
290 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
293 struct net_bridge *br = netdev_priv(dev);
295 return br_add_if(br, slave_dev);
298 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
300 struct net_bridge *br = netdev_priv(dev);
302 return br_del_if(br, slave_dev);
305 static const struct ethtool_ops br_ethtool_ops = {
306 .get_drvinfo = br_getinfo,
307 .get_link = ethtool_op_get_link,
310 static const struct net_device_ops br_netdev_ops = {
311 .ndo_open = br_dev_open,
312 .ndo_stop = br_dev_stop,
313 .ndo_init = br_dev_init,
314 .ndo_start_xmit = br_dev_xmit,
315 .ndo_get_stats64 = br_get_stats64,
316 .ndo_set_mac_address = br_set_mac_address,
317 .ndo_set_rx_mode = br_dev_set_multicast_list,
318 .ndo_change_rx_flags = br_dev_change_rx_flags,
319 .ndo_change_mtu = br_change_mtu,
320 .ndo_do_ioctl = br_dev_ioctl,
321 #ifdef CONFIG_NET_POLL_CONTROLLER
322 .ndo_netpoll_setup = br_netpoll_setup,
323 .ndo_netpoll_cleanup = br_netpoll_cleanup,
324 .ndo_poll_controller = br_poll_controller,
326 .ndo_add_slave = br_add_slave,
327 .ndo_del_slave = br_del_slave,
328 .ndo_fix_features = br_fix_features,
329 .ndo_fdb_add = br_fdb_add,
330 .ndo_fdb_del = br_fdb_delete,
331 .ndo_fdb_dump = br_fdb_dump,
332 .ndo_bridge_getlink = br_getlink,
333 .ndo_bridge_setlink = br_setlink,
334 .ndo_bridge_dellink = br_dellink,
337 static void br_dev_free(struct net_device *dev)
339 struct net_bridge *br = netdev_priv(dev);
341 free_percpu(br->stats);
345 static struct device_type br_type = {
349 void br_dev_setup(struct net_device *dev)
351 struct net_bridge *br = netdev_priv(dev);
353 eth_hw_addr_random(dev);
356 dev->netdev_ops = &br_netdev_ops;
357 dev->destructor = br_dev_free;
358 dev->ethtool_ops = &br_ethtool_ops;
359 SET_NETDEV_DEVTYPE(dev, &br_type);
360 dev->tx_queue_len = 0;
361 dev->priv_flags = IFF_EBRIDGE;
363 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
364 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
365 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
366 NETIF_F_HW_VLAN_STAG_TX;
367 dev->vlan_features = COMMON_FEATURES;
370 spin_lock_init(&br->lock);
371 INIT_LIST_HEAD(&br->port_list);
372 spin_lock_init(&br->hash_lock);
374 br->bridge_id.prio[0] = 0x80;
375 br->bridge_id.prio[1] = 0x00;
377 ether_addr_copy(br->group_addr, eth_reserved_addr_base);
379 br->stp_enabled = BR_NO_STP;
380 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
381 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
383 br->designated_root = br->bridge_id;
384 br->bridge_max_age = br->max_age = 20 * HZ;
385 br->bridge_hello_time = br->hello_time = 2 * HZ;
386 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
387 br->ageing_time = 300 * HZ;
389 br_netfilter_rtable_init(br);
390 br_stp_timer_init(br);
391 br_multicast_init(br);