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 no BH (preempt_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);
51 if (is_multicast_ether_addr(dest)) {
52 if (unlikely(netpoll_tx_running(dev))) {
53 br_flood_deliver(br, skb);
56 if (br_multicast_rcv(br, NULL, skb))
59 mdst = br_mdb_get(br, skb);
60 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
61 br_multicast_deliver(mdst, skb);
63 br_flood_deliver(br, skb);
64 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
65 br_deliver(dst->dst, skb);
67 br_flood_deliver(br, skb);
73 static int br_dev_open(struct net_device *dev)
75 struct net_bridge *br = netdev_priv(dev);
77 br_features_recompute(br);
78 netif_start_queue(dev);
79 br_stp_enable_bridge(br);
80 br_multicast_open(br);
85 static void br_dev_set_multicast_list(struct net_device *dev)
89 static int br_dev_stop(struct net_device *dev)
91 struct net_bridge *br = netdev_priv(dev);
93 br_stp_disable_bridge(br);
94 br_multicast_stop(br);
96 netif_stop_queue(dev);
101 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
102 struct rtnl_link_stats64 *stats)
104 struct net_bridge *br = netdev_priv(dev);
105 struct br_cpu_netstats tmp, sum = { 0 };
108 for_each_possible_cpu(cpu) {
110 const struct br_cpu_netstats *bstats
111 = per_cpu_ptr(br->stats, cpu);
113 start = u64_stats_fetch_begin(&bstats->syncp);
114 memcpy(&tmp, bstats, sizeof(tmp));
115 } while (u64_stats_fetch_retry(&bstats->syncp, start));
116 sum.tx_bytes += tmp.tx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.rx_bytes += tmp.rx_bytes;
119 sum.rx_packets += tmp.rx_packets;
122 stats->tx_bytes = sum.tx_bytes;
123 stats->tx_packets = sum.tx_packets;
124 stats->rx_bytes = sum.rx_bytes;
125 stats->rx_packets = sum.rx_packets;
130 static int br_change_mtu(struct net_device *dev, int new_mtu)
132 struct net_bridge *br = netdev_priv(dev);
133 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
138 #ifdef CONFIG_BRIDGE_NETFILTER
139 /* remember the MTU in the rtable for PMTU */
140 br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu;
146 /* Allow setting mac address to any valid ethernet address. */
147 static int br_set_mac_address(struct net_device *dev, void *p)
149 struct net_bridge *br = netdev_priv(dev);
150 struct sockaddr *addr = p;
152 if (!is_valid_ether_addr(addr->sa_data))
155 spin_lock_bh(&br->lock);
156 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
157 br_stp_change_bridge_id(br, addr->sa_data);
158 br->flags |= BR_SET_MAC_ADDR;
159 spin_unlock_bh(&br->lock);
164 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
166 strcpy(info->driver, "bridge");
167 strcpy(info->version, BR_VERSION);
168 strcpy(info->fw_version, "N/A");
169 strcpy(info->bus_info, "N/A");
172 static int br_set_sg(struct net_device *dev, u32 data)
174 struct net_bridge *br = netdev_priv(dev);
177 br->feature_mask |= NETIF_F_SG;
179 br->feature_mask &= ~NETIF_F_SG;
181 br_features_recompute(br);
185 static int br_set_tso(struct net_device *dev, u32 data)
187 struct net_bridge *br = netdev_priv(dev);
190 br->feature_mask |= NETIF_F_TSO;
192 br->feature_mask &= ~NETIF_F_TSO;
194 br_features_recompute(br);
198 static int br_set_tx_csum(struct net_device *dev, u32 data)
200 struct net_bridge *br = netdev_priv(dev);
203 br->feature_mask |= NETIF_F_NO_CSUM;
205 br->feature_mask &= ~NETIF_F_ALL_CSUM;
207 br_features_recompute(br);
211 #ifdef CONFIG_NET_POLL_CONTROLLER
212 static void br_poll_controller(struct net_device *br_dev)
216 static void br_netpoll_cleanup(struct net_device *dev)
218 struct net_bridge *br = netdev_priv(dev);
219 struct net_bridge_port *p, *n;
221 list_for_each_entry_safe(p, n, &br->port_list, list) {
222 br_netpoll_disable(p);
226 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
228 struct net_bridge *br = netdev_priv(dev);
229 struct net_bridge_port *p, *n;
232 list_for_each_entry_safe(p, n, &br->port_list, list) {
236 err = br_netpoll_enable(p);
245 br_netpoll_cleanup(dev);
249 int br_netpoll_enable(struct net_bridge_port *p)
254 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
261 err = __netpoll_setup(np);
273 void br_netpoll_disable(struct net_bridge_port *p)
275 struct netpoll *np = p->np;
282 /* Wait for transmitting packets to finish before freeing. */
283 synchronize_rcu_bh();
285 __netpoll_cleanup(np);
291 static const struct ethtool_ops br_ethtool_ops = {
292 .get_drvinfo = br_getinfo,
293 .get_link = ethtool_op_get_link,
294 .get_tx_csum = ethtool_op_get_tx_csum,
295 .set_tx_csum = br_set_tx_csum,
296 .get_sg = ethtool_op_get_sg,
298 .get_tso = ethtool_op_get_tso,
299 .set_tso = br_set_tso,
300 .get_ufo = ethtool_op_get_ufo,
301 .set_ufo = ethtool_op_set_ufo,
302 .get_flags = ethtool_op_get_flags,
305 static const struct net_device_ops br_netdev_ops = {
306 .ndo_open = br_dev_open,
307 .ndo_stop = br_dev_stop,
308 .ndo_start_xmit = br_dev_xmit,
309 .ndo_get_stats64 = br_get_stats64,
310 .ndo_set_mac_address = br_set_mac_address,
311 .ndo_set_multicast_list = br_dev_set_multicast_list,
312 .ndo_change_mtu = br_change_mtu,
313 .ndo_do_ioctl = br_dev_ioctl,
314 #ifdef CONFIG_NET_POLL_CONTROLLER
315 .ndo_netpoll_setup = br_netpoll_setup,
316 .ndo_netpoll_cleanup = br_netpoll_cleanup,
317 .ndo_poll_controller = br_poll_controller,
321 static void br_dev_free(struct net_device *dev)
323 struct net_bridge *br = netdev_priv(dev);
325 free_percpu(br->stats);
329 void br_dev_setup(struct net_device *dev)
331 random_ether_addr(dev->dev_addr);
334 dev->netdev_ops = &br_netdev_ops;
335 dev->destructor = br_dev_free;
336 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
337 dev->tx_queue_len = 0;
338 dev->priv_flags = IFF_EBRIDGE;
340 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
341 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
342 NETIF_F_NETNS_LOCAL | NETIF_F_GSO;