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/ethtool.h>
13 #include <linux/etherdevice.h>
17 #include <linux/veth.h>
19 #define DRV_NAME "veth"
20 #define DRV_VERSION "1.0"
22 #define MIN_MTU 68 /* Min L3 MTU */
23 #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
24 #define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */
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 *stats;
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 const 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 netdev_tx_t 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, *rcv_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);
166 rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
168 if (!(rcv->flags & IFF_UP))
171 if (skb->len > (rcv->mtu + MTU_PAD))
174 skb->tstamp.tv64 = 0;
175 skb->pkt_type = PACKET_HOST;
176 skb->protocol = eth_type_trans(skb, rcv);
177 if (dev->features & NETIF_F_NO_CSUM)
178 skb->ip_summed = rcv_priv->ip_summed;
186 stats->tx_bytes += length;
189 rcv_stats->rx_bytes += length;
190 rcv_stats->rx_packets++;
202 rcv_stats->rx_dropped++;
210 static struct net_device_stats *veth_get_stats(struct net_device *dev)
212 struct veth_priv *priv;
214 struct veth_net_stats *stats, total = {0};
216 priv = netdev_priv(dev);
218 for_each_possible_cpu(cpu) {
219 stats = per_cpu_ptr(priv->stats, cpu);
221 total.rx_packets += stats->rx_packets;
222 total.tx_packets += stats->tx_packets;
223 total.rx_bytes += stats->rx_bytes;
224 total.tx_bytes += stats->tx_bytes;
225 total.tx_dropped += stats->tx_dropped;
226 total.rx_dropped += stats->rx_dropped;
228 dev->stats.rx_packets = total.rx_packets;
229 dev->stats.tx_packets = total.tx_packets;
230 dev->stats.rx_bytes = total.rx_bytes;
231 dev->stats.tx_bytes = total.tx_bytes;
232 dev->stats.tx_dropped = total.tx_dropped;
233 dev->stats.rx_dropped = total.rx_dropped;
238 static int veth_open(struct net_device *dev)
240 struct veth_priv *priv;
242 priv = netdev_priv(dev);
243 if (priv->peer == NULL)
246 if (priv->peer->flags & IFF_UP) {
247 netif_carrier_on(dev);
248 netif_carrier_on(priv->peer);
253 static int veth_close(struct net_device *dev)
255 struct veth_priv *priv = netdev_priv(dev);
257 netif_carrier_off(dev);
258 netif_carrier_off(priv->peer);
263 static int is_valid_veth_mtu(int new_mtu)
265 return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
268 static int veth_change_mtu(struct net_device *dev, int new_mtu)
270 if (!is_valid_veth_mtu(new_mtu))
276 static int veth_dev_init(struct net_device *dev)
278 struct veth_net_stats *stats;
279 struct veth_priv *priv;
281 stats = alloc_percpu(struct veth_net_stats);
285 priv = netdev_priv(dev);
290 static void veth_dev_free(struct net_device *dev)
292 struct veth_priv *priv;
294 priv = netdev_priv(dev);
295 free_percpu(priv->stats);
299 static const struct net_device_ops veth_netdev_ops = {
300 .ndo_init = veth_dev_init,
301 .ndo_open = veth_open,
302 .ndo_stop = veth_close,
303 .ndo_start_xmit = veth_xmit,
304 .ndo_change_mtu = veth_change_mtu,
305 .ndo_get_stats = veth_get_stats,
306 .ndo_set_mac_address = eth_mac_addr,
309 static void veth_setup(struct net_device *dev)
313 dev->netdev_ops = &veth_netdev_ops;
314 dev->ethtool_ops = &veth_ethtool_ops;
315 dev->features |= NETIF_F_LLTX;
316 dev->destructor = veth_dev_free;
323 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
325 if (tb[IFLA_ADDRESS]) {
326 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
328 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
329 return -EADDRNOTAVAIL;
332 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
338 static struct rtnl_link_ops veth_link_ops;
340 static int veth_newlink(struct net_device *dev,
341 struct nlattr *tb[], struct nlattr *data[])
344 struct net_device *peer;
345 struct veth_priv *priv;
346 char ifname[IFNAMSIZ];
347 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
350 * create and register peer first
352 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
353 * skip it since no info from it is useful yet
356 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
357 struct nlattr *nla_peer;
359 nla_peer = data[VETH_INFO_PEER];
360 err = nla_parse(peer_tb, IFLA_MAX,
361 nla_data(nla_peer) + sizeof(struct ifinfomsg),
362 nla_len(nla_peer) - sizeof(struct ifinfomsg),
367 err = veth_validate(peer_tb, NULL);
375 if (tbp[IFLA_IFNAME])
376 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
378 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
380 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
382 return PTR_ERR(peer);
384 if (tbp[IFLA_ADDRESS] == NULL)
385 random_ether_addr(peer->dev_addr);
387 err = register_netdevice(peer);
389 goto err_register_peer;
391 netif_carrier_off(peer);
396 * note, that since we've registered new device the dev's name
397 * should be re-allocated
400 if (tb[IFLA_ADDRESS] == NULL)
401 random_ether_addr(dev->dev_addr);
404 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
406 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
408 if (strchr(dev->name, '%')) {
409 err = dev_alloc_name(dev, dev->name);
414 err = register_netdevice(dev);
416 goto err_register_dev;
418 netif_carrier_off(dev);
421 * tie the deviced together
424 priv = netdev_priv(dev);
427 priv = netdev_priv(peer);
434 unregister_netdevice(peer);
442 static void veth_dellink(struct net_device *dev)
444 struct veth_priv *priv;
445 struct net_device *peer;
447 priv = netdev_priv(dev);
450 unregister_netdevice(dev);
451 unregister_netdevice(peer);
454 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
456 static struct rtnl_link_ops veth_link_ops = {
458 .priv_size = sizeof(struct veth_priv),
460 .validate = veth_validate,
461 .newlink = veth_newlink,
462 .dellink = veth_dellink,
463 .policy = veth_policy,
464 .maxtype = VETH_INFO_MAX,
471 static __init int veth_init(void)
473 return rtnl_link_register(&veth_link_ops);
476 static __exit void veth_exit(void)
478 rtnl_link_unregister(&veth_link_ops);
481 module_init(veth_init);
482 module_exit(veth_exit);
484 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
485 MODULE_LICENSE("GPL v2");
486 MODULE_ALIAS_RTNL_LINK(DRV_NAME);