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 brstats->tx_packets++;
42 brstats->tx_bytes += skb->len;
44 BR_INPUT_SKB_CB(skb)->brdev = dev;
46 skb_reset_mac_header(skb);
47 skb_pull(skb, ETH_HLEN);
49 if (is_multicast_ether_addr(dest)) {
50 if (br_multicast_rcv(br, NULL, skb))
53 mdst = br_mdb_get(br, skb);
54 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
55 br_multicast_deliver(mdst, skb);
57 br_flood_deliver(br, skb);
58 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
59 br_deliver(dst->dst, skb);
61 br_flood_deliver(br, skb);
67 static int br_dev_open(struct net_device *dev)
69 struct net_bridge *br = netdev_priv(dev);
71 br_features_recompute(br);
72 netif_start_queue(dev);
73 br_stp_enable_bridge(br);
74 br_multicast_open(br);
79 static void br_dev_set_multicast_list(struct net_device *dev)
83 static int br_dev_stop(struct net_device *dev)
85 struct net_bridge *br = netdev_priv(dev);
87 br_stp_disable_bridge(br);
88 br_multicast_stop(br);
90 netif_stop_queue(dev);
95 static struct net_device_stats *br_get_stats(struct net_device *dev)
97 struct net_bridge *br = netdev_priv(dev);
98 struct net_device_stats *stats = &dev->stats;
99 struct br_cpu_netstats sum = { 0 };
102 for_each_possible_cpu(cpu) {
103 const struct br_cpu_netstats *bstats
104 = per_cpu_ptr(br->stats, cpu);
106 sum.tx_bytes += bstats->tx_bytes;
107 sum.tx_packets += bstats->tx_packets;
108 sum.rx_bytes += bstats->rx_bytes;
109 sum.rx_packets += bstats->rx_packets;
112 stats->tx_bytes = sum.tx_bytes;
113 stats->tx_packets = sum.tx_packets;
114 stats->rx_bytes = sum.rx_bytes;
115 stats->rx_packets = sum.rx_packets;
120 static int br_change_mtu(struct net_device *dev, int new_mtu)
122 struct net_bridge *br = netdev_priv(dev);
123 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
128 #ifdef CONFIG_BRIDGE_NETFILTER
129 /* remember the MTU in the rtable for PMTU */
130 br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
136 /* Allow setting mac address to any valid ethernet address. */
137 static int br_set_mac_address(struct net_device *dev, void *p)
139 struct net_bridge *br = netdev_priv(dev);
140 struct sockaddr *addr = p;
142 if (!is_valid_ether_addr(addr->sa_data))
145 spin_lock_bh(&br->lock);
146 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
147 br_stp_change_bridge_id(br, addr->sa_data);
148 br->flags |= BR_SET_MAC_ADDR;
149 spin_unlock_bh(&br->lock);
154 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
156 strcpy(info->driver, "bridge");
157 strcpy(info->version, BR_VERSION);
158 strcpy(info->fw_version, "N/A");
159 strcpy(info->bus_info, "N/A");
162 static int br_set_sg(struct net_device *dev, u32 data)
164 struct net_bridge *br = netdev_priv(dev);
167 br->feature_mask |= NETIF_F_SG;
169 br->feature_mask &= ~NETIF_F_SG;
171 br_features_recompute(br);
175 static int br_set_tso(struct net_device *dev, u32 data)
177 struct net_bridge *br = netdev_priv(dev);
180 br->feature_mask |= NETIF_F_TSO;
182 br->feature_mask &= ~NETIF_F_TSO;
184 br_features_recompute(br);
188 static int br_set_tx_csum(struct net_device *dev, u32 data)
190 struct net_bridge *br = netdev_priv(dev);
193 br->feature_mask |= NETIF_F_NO_CSUM;
195 br->feature_mask &= ~NETIF_F_ALL_CSUM;
197 br_features_recompute(br);
201 #ifdef CONFIG_NET_POLL_CONTROLLER
202 static bool br_devices_support_netpoll(struct net_bridge *br)
204 struct net_bridge_port *p;
209 spin_lock_irqsave(&br->lock, flags);
210 list_for_each_entry(p, &br->port_list, list) {
212 if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
213 !p->dev->netdev_ops->ndo_poll_controller)
216 spin_unlock_irqrestore(&br->lock, flags);
217 return count != 0 && ret;
220 void br_netpoll_cleanup(struct net_device *dev)
222 struct net_bridge *br = netdev_priv(dev);
223 struct net_bridge_port *p, *n;
224 const struct net_device_ops *ops;
226 br->dev->npinfo = NULL;
227 list_for_each_entry_safe(p, n, &br->port_list, list) {
229 ops = p->dev->netdev_ops;
230 if (ops->ndo_netpoll_cleanup)
231 ops->ndo_netpoll_cleanup(p->dev);
233 p->dev->npinfo = NULL;
238 void br_netpoll_disable(struct net_bridge *br,
239 struct net_device *dev)
241 if (br_devices_support_netpoll(br))
242 br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
243 if (dev->netdev_ops->ndo_netpoll_cleanup)
244 dev->netdev_ops->ndo_netpoll_cleanup(dev);
249 void br_netpoll_enable(struct net_bridge *br,
250 struct net_device *dev)
252 if (br_devices_support_netpoll(br)) {
253 br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
255 dev->npinfo = br->dev->npinfo;
256 } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
257 br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
258 br_info(br,"new device %s does not support netpoll (disabling)",
265 static const struct ethtool_ops br_ethtool_ops = {
266 .get_drvinfo = br_getinfo,
267 .get_link = ethtool_op_get_link,
268 .get_tx_csum = ethtool_op_get_tx_csum,
269 .set_tx_csum = br_set_tx_csum,
270 .get_sg = ethtool_op_get_sg,
272 .get_tso = ethtool_op_get_tso,
273 .set_tso = br_set_tso,
274 .get_ufo = ethtool_op_get_ufo,
275 .set_ufo = ethtool_op_set_ufo,
276 .get_flags = ethtool_op_get_flags,
279 static const struct net_device_ops br_netdev_ops = {
280 .ndo_open = br_dev_open,
281 .ndo_stop = br_dev_stop,
282 .ndo_start_xmit = br_dev_xmit,
283 .ndo_get_stats = br_get_stats,
284 .ndo_set_mac_address = br_set_mac_address,
285 .ndo_set_multicast_list = br_dev_set_multicast_list,
286 .ndo_change_mtu = br_change_mtu,
287 .ndo_do_ioctl = br_dev_ioctl,
288 #ifdef CONFIG_NET_POLL_CONTROLLER
289 .ndo_netpoll_cleanup = br_netpoll_cleanup,
293 static void br_dev_free(struct net_device *dev)
295 struct net_bridge *br = netdev_priv(dev);
297 free_percpu(br->stats);
301 void br_dev_setup(struct net_device *dev)
303 random_ether_addr(dev->dev_addr);
306 dev->netdev_ops = &br_netdev_ops;
307 dev->destructor = br_dev_free;
308 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
309 dev->tx_queue_len = 0;
310 dev->priv_flags = IFF_EBRIDGE;
312 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
313 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
314 NETIF_F_NETNS_LOCAL | NETIF_F_GSO;