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/netdevice.h>
12 #include <linux/slab.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
18 #include <linux/veth.h>
20 #define DRV_NAME "veth"
21 #define DRV_VERSION "1.0"
23 #define MIN_MTU 68 /* Min L3 MTU */
24 #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
26 struct veth_net_stats {
36 struct net_device *peer;
37 struct veth_net_stats __percpu *stats;
45 const char string[ETH_GSTRING_LEN];
46 } ethtool_stats_keys[] = {
50 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
54 ethtool_cmd_speed_set(cmd, SPEED_10000);
55 cmd->duplex = DUPLEX_FULL;
58 cmd->transceiver = XCVR_INTERNAL;
59 cmd->autoneg = AUTONEG_DISABLE;
65 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
67 strcpy(info->driver, DRV_NAME);
68 strcpy(info->version, DRV_VERSION);
69 strcpy(info->fw_version, "N/A");
72 static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
76 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
81 static int veth_get_sset_count(struct net_device *dev, int sset)
85 return ARRAY_SIZE(ethtool_stats_keys);
91 static void veth_get_ethtool_stats(struct net_device *dev,
92 struct ethtool_stats *stats, u64 *data)
94 struct veth_priv *priv;
96 priv = netdev_priv(dev);
97 data[0] = priv->peer->ifindex;
100 static const struct ethtool_ops veth_ethtool_ops = {
101 .get_settings = veth_get_settings,
102 .get_drvinfo = veth_get_drvinfo,
103 .get_link = ethtool_op_get_link,
104 .get_strings = veth_get_strings,
105 .get_sset_count = veth_get_sset_count,
106 .get_ethtool_stats = veth_get_ethtool_stats,
113 static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
115 struct net_device *rcv = NULL;
116 struct veth_priv *priv, *rcv_priv;
117 struct veth_net_stats *stats, *rcv_stats;
120 priv = netdev_priv(dev);
122 rcv_priv = netdev_priv(rcv);
124 stats = this_cpu_ptr(priv->stats);
125 rcv_stats = this_cpu_ptr(rcv_priv->stats);
127 if (!(rcv->flags & IFF_UP))
130 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
131 will cause bad checksum on forwarded packets */
132 if (skb->ip_summed == CHECKSUM_NONE &&
133 rcv->features & NETIF_F_RXCSUM)
134 skb->ip_summed = CHECKSUM_UNNECESSARY;
137 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
140 stats->tx_bytes += length;
143 rcv_stats->rx_bytes += length;
144 rcv_stats->rx_packets++;
154 rcv_stats->rx_dropped++;
162 static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
163 struct rtnl_link_stats64 *tot)
165 struct veth_priv *priv;
167 struct veth_net_stats *stats;
169 priv = netdev_priv(dev);
171 for_each_possible_cpu(cpu) {
172 stats = per_cpu_ptr(priv->stats, cpu);
174 tot->rx_packets += stats->rx_packets;
175 tot->tx_packets += stats->tx_packets;
176 tot->rx_bytes += stats->rx_bytes;
177 tot->tx_bytes += stats->tx_bytes;
178 tot->tx_dropped += stats->tx_dropped;
179 tot->rx_dropped += stats->rx_dropped;
185 static int veth_open(struct net_device *dev)
187 struct veth_priv *priv;
189 priv = netdev_priv(dev);
190 if (priv->peer == NULL)
193 if (priv->peer->flags & IFF_UP) {
194 netif_carrier_on(dev);
195 netif_carrier_on(priv->peer);
200 static int veth_close(struct net_device *dev)
202 struct veth_priv *priv = netdev_priv(dev);
204 netif_carrier_off(dev);
205 netif_carrier_off(priv->peer);
210 static int is_valid_veth_mtu(int new_mtu)
212 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
215 static int veth_change_mtu(struct net_device *dev, int new_mtu)
217 if (!is_valid_veth_mtu(new_mtu))
223 static int veth_dev_init(struct net_device *dev)
225 struct veth_net_stats __percpu *stats;
226 struct veth_priv *priv;
228 stats = alloc_percpu(struct veth_net_stats);
232 priv = netdev_priv(dev);
237 static void veth_dev_free(struct net_device *dev)
239 struct veth_priv *priv;
241 priv = netdev_priv(dev);
242 free_percpu(priv->stats);
246 static const struct net_device_ops veth_netdev_ops = {
247 .ndo_init = veth_dev_init,
248 .ndo_open = veth_open,
249 .ndo_stop = veth_close,
250 .ndo_start_xmit = veth_xmit,
251 .ndo_change_mtu = veth_change_mtu,
252 .ndo_get_stats64 = veth_get_stats64,
253 .ndo_set_mac_address = eth_mac_addr,
256 static void veth_setup(struct net_device *dev)
260 dev->netdev_ops = &veth_netdev_ops;
261 dev->ethtool_ops = &veth_ethtool_ops;
262 dev->features |= NETIF_F_LLTX;
263 dev->destructor = veth_dev_free;
265 dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
272 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
274 if (tb[IFLA_ADDRESS]) {
275 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
277 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
278 return -EADDRNOTAVAIL;
281 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
287 static struct rtnl_link_ops veth_link_ops;
289 static int veth_newlink(struct net *src_net, struct net_device *dev,
290 struct nlattr *tb[], struct nlattr *data[])
293 struct net_device *peer;
294 struct veth_priv *priv;
295 char ifname[IFNAMSIZ];
296 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
297 struct ifinfomsg *ifmp;
301 * create and register peer first
303 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
304 struct nlattr *nla_peer;
306 nla_peer = data[VETH_INFO_PEER];
307 ifmp = nla_data(nla_peer);
308 err = nla_parse(peer_tb, IFLA_MAX,
309 nla_data(nla_peer) + sizeof(struct ifinfomsg),
310 nla_len(nla_peer) - sizeof(struct ifinfomsg),
315 err = veth_validate(peer_tb, NULL);
325 if (tbp[IFLA_IFNAME])
326 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
328 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
330 net = rtnl_link_get_net(src_net, tbp);
334 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
337 return PTR_ERR(peer);
340 if (tbp[IFLA_ADDRESS] == NULL)
341 random_ether_addr(peer->dev_addr);
343 err = register_netdevice(peer);
347 goto err_register_peer;
349 netif_carrier_off(peer);
351 err = rtnl_configure_link(peer, ifmp);
353 goto err_configure_peer;
358 * note, that since we've registered new device the dev's name
359 * should be re-allocated
362 if (tb[IFLA_ADDRESS] == NULL)
363 random_ether_addr(dev->dev_addr);
366 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
368 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
370 if (strchr(dev->name, '%')) {
371 err = dev_alloc_name(dev, dev->name);
376 err = register_netdevice(dev);
378 goto err_register_dev;
380 netif_carrier_off(dev);
383 * tie the deviced together
386 priv = netdev_priv(dev);
389 priv = netdev_priv(peer);
397 unregister_netdevice(peer);
405 static void veth_dellink(struct net_device *dev, struct list_head *head)
407 struct veth_priv *priv;
408 struct net_device *peer;
410 priv = netdev_priv(dev);
413 unregister_netdevice_queue(dev, head);
414 unregister_netdevice_queue(peer, head);
417 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
419 static struct rtnl_link_ops veth_link_ops = {
421 .priv_size = sizeof(struct veth_priv),
423 .validate = veth_validate,
424 .newlink = veth_newlink,
425 .dellink = veth_dellink,
426 .policy = veth_policy,
427 .maxtype = VETH_INFO_MAX,
434 static __init int veth_init(void)
436 return rtnl_link_register(&veth_link_ops);
439 static __exit void veth_exit(void)
441 rtnl_link_unregister(&veth_link_ops);
444 module_init(veth_init);
445 module_exit(veth_exit);
447 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
448 MODULE_LICENSE("GPL v2");
449 MODULE_ALIAS_RTNL_LINK(DRV_NAME);