4 * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
6 * Author: Pavel Emelianov <xemul@openvz.org>
7 * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
11 #include <linux/list.h>
12 #include <linux/netdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
20 #define DRV_NAME "veth"
21 #define DRV_VERSION "1.0"
23 struct veth_net_stats {
24 unsigned long rx_packets;
25 unsigned long tx_packets;
26 unsigned long rx_bytes;
27 unsigned long tx_bytes;
28 unsigned long tx_dropped;
32 struct net_device *peer;
33 struct net_device *dev;
34 struct list_head list;
35 struct veth_net_stats *stats;
39 static LIST_HEAD(veth_list);
46 const char string[ETH_GSTRING_LEN];
47 } ethtool_stats_keys[] = {
51 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
55 cmd->speed = SPEED_10000;
56 cmd->duplex = DUPLEX_FULL;
59 cmd->transceiver = XCVR_INTERNAL;
60 cmd->autoneg = AUTONEG_DISABLE;
66 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
68 strcpy(info->driver, DRV_NAME);
69 strcpy(info->version, DRV_VERSION);
70 strcpy(info->fw_version, "N/A");
73 static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
77 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
82 static int veth_get_sset_count(struct net_device *dev, int sset)
86 return ARRAY_SIZE(ethtool_stats_keys);
92 static void veth_get_ethtool_stats(struct net_device *dev,
93 struct ethtool_stats *stats, u64 *data)
95 struct veth_priv *priv;
97 priv = netdev_priv(dev);
98 data[0] = priv->peer->ifindex;
101 static u32 veth_get_rx_csum(struct net_device *dev)
103 struct veth_priv *priv;
105 priv = netdev_priv(dev);
106 return priv->ip_summed == CHECKSUM_UNNECESSARY;
109 static int veth_set_rx_csum(struct net_device *dev, u32 data)
111 struct veth_priv *priv;
113 priv = netdev_priv(dev);
114 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
118 static u32 veth_get_tx_csum(struct net_device *dev)
120 return (dev->features & NETIF_F_NO_CSUM) != 0;
123 static int veth_set_tx_csum(struct net_device *dev, u32 data)
126 dev->features |= NETIF_F_NO_CSUM;
128 dev->features &= ~NETIF_F_NO_CSUM;
132 static struct ethtool_ops veth_ethtool_ops = {
133 .get_settings = veth_get_settings,
134 .get_drvinfo = veth_get_drvinfo,
135 .get_link = ethtool_op_get_link,
136 .get_rx_csum = veth_get_rx_csum,
137 .set_rx_csum = veth_set_rx_csum,
138 .get_tx_csum = veth_get_tx_csum,
139 .set_tx_csum = veth_set_tx_csum,
140 .get_sg = ethtool_op_get_sg,
141 .set_sg = ethtool_op_set_sg,
142 .get_strings = veth_get_strings,
143 .get_sset_count = veth_get_sset_count,
144 .get_ethtool_stats = veth_get_ethtool_stats,
151 static int veth_xmit(struct sk_buff *skb, struct net_device *dev)
153 struct net_device *rcv = NULL;
154 struct veth_priv *priv, *rcv_priv;
155 struct veth_net_stats *stats;
160 priv = netdev_priv(dev);
162 rcv_priv = netdev_priv(rcv);
164 cpu = smp_processor_id();
165 stats = per_cpu_ptr(priv->stats, cpu);
167 if (!(rcv->flags & IFF_UP))
170 skb->pkt_type = PACKET_HOST;
171 skb->protocol = eth_type_trans(skb, rcv);
172 if (dev->features & NETIF_F_NO_CSUM)
173 skb->ip_summed = rcv_priv->ip_summed;
175 dst_release(skb->dst);
183 stats->tx_bytes += length;
186 stats = per_cpu_ptr(rcv_priv->stats, cpu);
187 stats->rx_bytes += length;
203 static struct net_device_stats *veth_get_stats(struct net_device *dev)
205 struct veth_priv *priv;
206 struct net_device_stats *dev_stats;
208 struct veth_net_stats *stats;
210 priv = netdev_priv(dev);
211 dev_stats = &dev->stats;
213 dev_stats->rx_packets = 0;
214 dev_stats->tx_packets = 0;
215 dev_stats->rx_bytes = 0;
216 dev_stats->tx_bytes = 0;
217 dev_stats->tx_dropped = 0;
219 for_each_online_cpu(cpu) {
220 stats = per_cpu_ptr(priv->stats, cpu);
222 dev_stats->rx_packets += stats->rx_packets;
223 dev_stats->tx_packets += stats->tx_packets;
224 dev_stats->rx_bytes += stats->rx_bytes;
225 dev_stats->tx_bytes += stats->tx_bytes;
226 dev_stats->tx_dropped += stats->tx_dropped;
232 static int veth_open(struct net_device *dev)
234 struct veth_priv *priv;
236 priv = netdev_priv(dev);
237 if (priv->peer == NULL)
240 if (priv->peer->flags & IFF_UP) {
241 netif_carrier_on(dev);
242 netif_carrier_on(priv->peer);
247 static int veth_close(struct net_device *dev)
249 struct veth_priv *priv;
251 if (netif_carrier_ok(dev)) {
252 priv = netdev_priv(dev);
253 netif_carrier_off(dev);
254 netif_carrier_off(priv->peer);
259 static int veth_dev_init(struct net_device *dev)
261 struct veth_net_stats *stats;
262 struct veth_priv *priv;
264 stats = alloc_percpu(struct veth_net_stats);
268 priv = netdev_priv(dev);
273 static void veth_dev_free(struct net_device *dev)
275 struct veth_priv *priv;
277 priv = netdev_priv(dev);
278 free_percpu(priv->stats);
282 static void veth_setup(struct net_device *dev)
286 dev->hard_start_xmit = veth_xmit;
287 dev->get_stats = veth_get_stats;
288 dev->open = veth_open;
289 dev->stop = veth_close;
290 dev->ethtool_ops = &veth_ethtool_ops;
291 dev->features |= NETIF_F_LLTX;
292 dev->init = veth_dev_init;
293 dev->destructor = veth_dev_free;
300 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
302 if (tb[IFLA_ADDRESS]) {
303 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
305 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
306 return -EADDRNOTAVAIL;
311 static struct rtnl_link_ops veth_link_ops;
313 static int veth_newlink(struct net_device *dev,
314 struct nlattr *tb[], struct nlattr *data[])
317 struct net_device *peer;
318 struct veth_priv *priv;
319 char ifname[IFNAMSIZ];
320 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
323 * create and register peer first
325 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
326 * skip it since no info from it is useful yet
329 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
330 struct nlattr *nla_peer;
332 nla_peer = data[VETH_INFO_PEER];
333 err = nla_parse(peer_tb, IFLA_MAX,
334 nla_data(nla_peer) + sizeof(struct ifinfomsg),
335 nla_len(nla_peer) - sizeof(struct ifinfomsg),
340 err = veth_validate(peer_tb, NULL);
348 if (tbp[IFLA_IFNAME])
349 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
351 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
353 peer = rtnl_create_link(dev->nd_net, ifname, &veth_link_ops, tbp);
355 return PTR_ERR(peer);
357 if (tbp[IFLA_ADDRESS] == NULL)
358 random_ether_addr(peer->dev_addr);
360 err = register_netdevice(peer);
362 goto err_register_peer;
364 netif_carrier_off(peer);
369 * note, that since we've registered new device the dev's name
370 * should be re-allocated
373 if (tb[IFLA_ADDRESS] == NULL)
374 random_ether_addr(dev->dev_addr);
377 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
379 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
381 if (strchr(dev->name, '%')) {
382 err = dev_alloc_name(dev, dev->name);
387 err = register_netdevice(dev);
389 goto err_register_dev;
391 netif_carrier_off(dev);
394 * tie the deviced together
397 priv = netdev_priv(dev);
400 list_add(&priv->list, &veth_list);
402 priv = netdev_priv(peer);
405 INIT_LIST_HEAD(&priv->list);
411 unregister_netdevice(peer);
419 static void veth_dellink(struct net_device *dev)
421 struct veth_priv *priv;
422 struct net_device *peer;
424 priv = netdev_priv(dev);
427 if (!list_empty(&priv->list))
428 list_del(&priv->list);
430 priv = netdev_priv(peer);
431 if (!list_empty(&priv->list))
432 list_del(&priv->list);
434 unregister_netdevice(dev);
435 unregister_netdevice(peer);
438 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
440 static struct rtnl_link_ops veth_link_ops = {
442 .priv_size = sizeof(struct veth_priv),
444 .validate = veth_validate,
445 .newlink = veth_newlink,
446 .dellink = veth_dellink,
447 .policy = veth_policy,
448 .maxtype = VETH_INFO_MAX,
455 static __init int veth_init(void)
457 return rtnl_link_register(&veth_link_ops);
460 static __exit void veth_exit(void)
462 struct veth_priv *priv, *next;
466 * cannot trust __rtnl_link_unregister() to unregister all
467 * devices, as each ->dellink call will remove two devices
468 * from the list at once.
470 list_for_each_entry_safe(priv, next, &veth_list, list)
471 veth_dellink(priv->dev);
473 __rtnl_link_unregister(&veth_link_ops);
477 module_init(veth_init);
478 module_exit(veth_exit);
480 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
481 MODULE_LICENSE("GPL v2");
482 MODULE_ALIAS_RTNL_LINK(DRV_NAME);