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 {
27 unsigned long rx_packets;
28 unsigned long tx_packets;
29 unsigned long rx_bytes;
30 unsigned long tx_bytes;
31 unsigned long tx_dropped;
32 unsigned long rx_dropped;
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 net_device_stats *veth_get_stats(struct net_device *dev)
164 struct veth_priv *priv;
166 struct veth_net_stats *stats, total = {0};
168 priv = netdev_priv(dev);
170 for_each_possible_cpu(cpu) {
171 stats = per_cpu_ptr(priv->stats, cpu);
173 total.rx_packets += stats->rx_packets;
174 total.tx_packets += stats->tx_packets;
175 total.rx_bytes += stats->rx_bytes;
176 total.tx_bytes += stats->tx_bytes;
177 total.tx_dropped += stats->tx_dropped;
178 total.rx_dropped += stats->rx_dropped;
180 dev->stats.rx_packets = total.rx_packets;
181 dev->stats.tx_packets = total.tx_packets;
182 dev->stats.rx_bytes = total.rx_bytes;
183 dev->stats.tx_bytes = total.tx_bytes;
184 dev->stats.tx_dropped = total.tx_dropped;
185 dev->stats.rx_dropped = total.rx_dropped;
190 static int veth_open(struct net_device *dev)
192 struct veth_priv *priv;
194 priv = netdev_priv(dev);
195 if (priv->peer == NULL)
198 if (priv->peer->flags & IFF_UP) {
199 netif_carrier_on(dev);
200 netif_carrier_on(priv->peer);
205 static int veth_close(struct net_device *dev)
207 struct veth_priv *priv = netdev_priv(dev);
209 netif_carrier_off(dev);
210 netif_carrier_off(priv->peer);
215 static int is_valid_veth_mtu(int new_mtu)
217 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
220 static int veth_change_mtu(struct net_device *dev, int new_mtu)
222 if (!is_valid_veth_mtu(new_mtu))
228 static int veth_dev_init(struct net_device *dev)
230 struct veth_net_stats __percpu *stats;
231 struct veth_priv *priv;
233 stats = alloc_percpu(struct veth_net_stats);
237 priv = netdev_priv(dev);
242 static void veth_dev_free(struct net_device *dev)
244 struct veth_priv *priv;
246 priv = netdev_priv(dev);
247 free_percpu(priv->stats);
251 static const struct net_device_ops veth_netdev_ops = {
252 .ndo_init = veth_dev_init,
253 .ndo_open = veth_open,
254 .ndo_stop = veth_close,
255 .ndo_start_xmit = veth_xmit,
256 .ndo_change_mtu = veth_change_mtu,
257 .ndo_get_stats = veth_get_stats,
258 .ndo_set_mac_address = eth_mac_addr,
261 static void veth_setup(struct net_device *dev)
265 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
267 dev->netdev_ops = &veth_netdev_ops;
268 dev->ethtool_ops = &veth_ethtool_ops;
269 dev->features |= NETIF_F_LLTX;
270 dev->destructor = veth_dev_free;
272 dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
279 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
281 if (tb[IFLA_ADDRESS]) {
282 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
284 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
285 return -EADDRNOTAVAIL;
288 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
294 static struct rtnl_link_ops veth_link_ops;
296 static int veth_newlink(struct net *src_net, struct net_device *dev,
297 struct nlattr *tb[], struct nlattr *data[])
300 struct net_device *peer;
301 struct veth_priv *priv;
302 char ifname[IFNAMSIZ];
303 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
304 struct ifinfomsg *ifmp;
308 * create and register peer first
310 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
311 struct nlattr *nla_peer;
313 nla_peer = data[VETH_INFO_PEER];
314 ifmp = nla_data(nla_peer);
315 err = nla_parse(peer_tb, IFLA_MAX,
316 nla_data(nla_peer) + sizeof(struct ifinfomsg),
317 nla_len(nla_peer) - sizeof(struct ifinfomsg),
322 err = veth_validate(peer_tb, NULL);
332 if (tbp[IFLA_IFNAME])
333 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
335 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
337 net = rtnl_link_get_net(src_net, tbp);
341 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
344 return PTR_ERR(peer);
347 if (tbp[IFLA_ADDRESS] == NULL)
348 random_ether_addr(peer->dev_addr);
350 err = register_netdevice(peer);
354 goto err_register_peer;
356 netif_carrier_off(peer);
358 err = rtnl_configure_link(peer, ifmp);
360 goto err_configure_peer;
365 * note, that since we've registered new device the dev's name
366 * should be re-allocated
369 if (tb[IFLA_ADDRESS] == NULL)
370 random_ether_addr(dev->dev_addr);
373 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
375 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
377 if (strchr(dev->name, '%')) {
378 err = dev_alloc_name(dev, dev->name);
383 err = register_netdevice(dev);
385 goto err_register_dev;
387 netif_carrier_off(dev);
390 * tie the deviced together
393 priv = netdev_priv(dev);
396 priv = netdev_priv(peer);
404 unregister_netdevice(peer);
412 static void veth_dellink(struct net_device *dev, struct list_head *head)
414 struct veth_priv *priv;
415 struct net_device *peer;
417 priv = netdev_priv(dev);
420 unregister_netdevice_queue(dev, head);
421 unregister_netdevice_queue(peer, head);
424 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
425 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
428 static struct rtnl_link_ops veth_link_ops = {
430 .priv_size = sizeof(struct veth_priv),
432 .validate = veth_validate,
433 .newlink = veth_newlink,
434 .dellink = veth_dellink,
435 .policy = veth_policy,
436 .maxtype = VETH_INFO_MAX,
443 static __init int veth_init(void)
445 return rtnl_link_register(&veth_link_ops);
448 static __exit void veth_exit(void)
450 rtnl_link_unregister(&veth_link_ops);
453 module_init(veth_init);
454 module_exit(veth_exit);
456 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
457 MODULE_LICENSE("GPL v2");
458 MODULE_ALIAS_RTNL_LINK(DRV_NAME);