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);
34 #ifdef CONFIG_BRIDGE_NETFILTER
35 if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
36 br_nf_pre_routing_finish_bridge_slow(skb);
41 u64_stats_update_begin(&brstats->syncp);
42 brstats->tx_packets++;
43 brstats->tx_bytes += skb->len;
44 u64_stats_update_end(&brstats->syncp);
46 BR_INPUT_SKB_CB(skb)->brdev = dev;
48 skb_reset_mac_header(skb);
49 skb_pull(skb, ETH_HLEN);
52 if (is_multicast_ether_addr(dest)) {
53 if (unlikely(netpoll_tx_running(dev))) {
54 br_flood_deliver(br, skb);
57 if (br_multicast_rcv(br, NULL, skb)) {
62 mdst = br_mdb_get(br, skb);
63 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
64 br_multicast_deliver(mdst, skb);
66 br_flood_deliver(br, skb);
67 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
68 br_deliver(dst->dst, skb);
70 br_flood_deliver(br, skb);
77 static int br_dev_open(struct net_device *dev)
79 struct net_bridge *br = netdev_priv(dev);
81 br_features_recompute(br);
82 netif_start_queue(dev);
83 br_stp_enable_bridge(br);
84 br_multicast_open(br);
89 static void br_dev_set_multicast_list(struct net_device *dev)
93 static int br_dev_stop(struct net_device *dev)
95 struct net_bridge *br = netdev_priv(dev);
97 br_stp_disable_bridge(br);
98 br_multicast_stop(br);
100 netif_stop_queue(dev);
105 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
106 struct rtnl_link_stats64 *stats)
108 struct net_bridge *br = netdev_priv(dev);
109 struct br_cpu_netstats tmp, sum = { 0 };
112 for_each_possible_cpu(cpu) {
114 const struct br_cpu_netstats *bstats
115 = per_cpu_ptr(br->stats, cpu);
117 start = u64_stats_fetch_begin(&bstats->syncp);
118 memcpy(&tmp, bstats, sizeof(tmp));
119 } while (u64_stats_fetch_retry(&bstats->syncp, start));
120 sum.tx_bytes += tmp.tx_bytes;
121 sum.tx_packets += tmp.tx_packets;
122 sum.rx_bytes += tmp.rx_bytes;
123 sum.rx_packets += tmp.rx_packets;
126 stats->tx_bytes = sum.tx_bytes;
127 stats->tx_packets = sum.tx_packets;
128 stats->rx_bytes = sum.rx_bytes;
129 stats->rx_packets = sum.rx_packets;
134 static int br_change_mtu(struct net_device *dev, int new_mtu)
136 struct net_bridge *br = netdev_priv(dev);
137 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
142 #ifdef CONFIG_BRIDGE_NETFILTER
143 /* remember the MTU in the rtable for PMTU */
144 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
150 /* Allow setting mac address to any valid ethernet address. */
151 static int br_set_mac_address(struct net_device *dev, void *p)
153 struct net_bridge *br = netdev_priv(dev);
154 struct sockaddr *addr = p;
156 if (!is_valid_ether_addr(addr->sa_data))
159 spin_lock_bh(&br->lock);
160 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
161 br_stp_change_bridge_id(br, addr->sa_data);
162 br->flags |= BR_SET_MAC_ADDR;
163 spin_unlock_bh(&br->lock);
168 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
170 strcpy(info->driver, "bridge");
171 strcpy(info->version, BR_VERSION);
172 strcpy(info->fw_version, "N/A");
173 strcpy(info->bus_info, "N/A");
176 static int br_set_sg(struct net_device *dev, u32 data)
178 struct net_bridge *br = netdev_priv(dev);
181 br->feature_mask |= NETIF_F_SG;
183 br->feature_mask &= ~NETIF_F_SG;
185 br_features_recompute(br);
189 static int br_set_tso(struct net_device *dev, u32 data)
191 struct net_bridge *br = netdev_priv(dev);
194 br->feature_mask |= NETIF_F_TSO;
196 br->feature_mask &= ~NETIF_F_TSO;
198 br_features_recompute(br);
202 static int br_set_tx_csum(struct net_device *dev, u32 data)
204 struct net_bridge *br = netdev_priv(dev);
207 br->feature_mask |= NETIF_F_NO_CSUM;
209 br->feature_mask &= ~NETIF_F_ALL_CSUM;
211 br_features_recompute(br);
215 static int br_set_flags(struct net_device *netdev, u32 data)
217 return ethtool_op_set_flags(netdev, data, ETH_FLAG_TXVLAN);
220 #ifdef CONFIG_NET_POLL_CONTROLLER
221 static void br_poll_controller(struct net_device *br_dev)
225 static void br_netpoll_cleanup(struct net_device *dev)
227 struct net_bridge *br = netdev_priv(dev);
228 struct net_bridge_port *p, *n;
230 list_for_each_entry_safe(p, n, &br->port_list, list) {
231 br_netpoll_disable(p);
235 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
237 struct net_bridge *br = netdev_priv(dev);
238 struct net_bridge_port *p, *n;
241 list_for_each_entry_safe(p, n, &br->port_list, list) {
245 err = br_netpoll_enable(p);
254 br_netpoll_cleanup(dev);
258 int br_netpoll_enable(struct net_bridge_port *p)
263 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
270 err = __netpoll_setup(np);
282 void br_netpoll_disable(struct net_bridge_port *p)
284 struct netpoll *np = p->np;
291 /* Wait for transmitting packets to finish before freeing. */
292 synchronize_rcu_bh();
294 __netpoll_cleanup(np);
300 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
303 struct net_bridge *br = netdev_priv(dev);
305 return br_add_if(br, slave_dev);
308 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
310 struct net_bridge *br = netdev_priv(dev);
312 return br_del_if(br, slave_dev);
315 static const struct ethtool_ops br_ethtool_ops = {
316 .get_drvinfo = br_getinfo,
317 .get_link = ethtool_op_get_link,
318 .get_tx_csum = ethtool_op_get_tx_csum,
319 .set_tx_csum = br_set_tx_csum,
320 .get_sg = ethtool_op_get_sg,
322 .get_tso = ethtool_op_get_tso,
323 .set_tso = br_set_tso,
324 .get_ufo = ethtool_op_get_ufo,
325 .set_ufo = ethtool_op_set_ufo,
326 .get_flags = ethtool_op_get_flags,
327 .set_flags = br_set_flags,
330 static const struct net_device_ops br_netdev_ops = {
331 .ndo_open = br_dev_open,
332 .ndo_stop = br_dev_stop,
333 .ndo_start_xmit = br_dev_xmit,
334 .ndo_get_stats64 = br_get_stats64,
335 .ndo_set_mac_address = br_set_mac_address,
336 .ndo_set_multicast_list = br_dev_set_multicast_list,
337 .ndo_change_mtu = br_change_mtu,
338 .ndo_do_ioctl = br_dev_ioctl,
339 #ifdef CONFIG_NET_POLL_CONTROLLER
340 .ndo_netpoll_setup = br_netpoll_setup,
341 .ndo_netpoll_cleanup = br_netpoll_cleanup,
342 .ndo_poll_controller = br_poll_controller,
344 .ndo_add_slave = br_add_slave,
345 .ndo_del_slave = br_del_slave,
348 static void br_dev_free(struct net_device *dev)
350 struct net_bridge *br = netdev_priv(dev);
352 free_percpu(br->stats);
356 void br_dev_setup(struct net_device *dev)
358 random_ether_addr(dev->dev_addr);
361 dev->netdev_ops = &br_netdev_ops;
362 dev->destructor = br_dev_free;
363 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
364 dev->tx_queue_len = 0;
365 dev->priv_flags = IFF_EBRIDGE;
367 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
368 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
369 NETIF_F_NETNS_LOCAL | NETIF_F_GSO | NETIF_F_HW_VLAN_TX;