Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6/linux-mips/linux-dm7025.git] / drivers / net / veth.c
blob31cd817f33f97be658d31bed4ba93ec101312255
1 /*
2 * drivers/net/veth.c
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>
9 */
11 #include <linux/list.h>
12 #include <linux/netdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
16 #include <net/dst.h>
17 #include <net/xfrm.h>
18 #include <linux/veth.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;
31 struct veth_priv {
32 struct net_device *peer;
33 struct net_device *dev;
34 struct list_head list;
35 struct veth_net_stats *stats;
36 unsigned ip_summed;
39 static LIST_HEAD(veth_list);
42 * ethtool interface
45 static struct {
46 const char string[ETH_GSTRING_LEN];
47 } ethtool_stats_keys[] = {
48 { "peer_ifindex" },
51 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
53 cmd->supported = 0;
54 cmd->advertising = 0;
55 cmd->speed = SPEED_10000;
56 cmd->duplex = DUPLEX_FULL;
57 cmd->port = PORT_TP;
58 cmd->phy_address = 0;
59 cmd->transceiver = XCVR_INTERNAL;
60 cmd->autoneg = AUTONEG_DISABLE;
61 cmd->maxtxpkt = 0;
62 cmd->maxrxpkt = 0;
63 return 0;
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)
75 switch(stringset) {
76 case ETH_SS_STATS:
77 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
78 break;
82 static int veth_get_sset_count(struct net_device *dev, int sset)
84 switch (sset) {
85 case ETH_SS_STATS:
86 return ARRAY_SIZE(ethtool_stats_keys);
87 default:
88 return -EOPNOTSUPP;
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;
115 return 0;
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)
125 if (data)
126 dev->features |= NETIF_F_NO_CSUM;
127 else
128 dev->features &= ~NETIF_F_NO_CSUM;
129 return 0;
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,
148 * xmit
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;
156 int length, cpu;
158 skb_orphan(skb);
160 priv = netdev_priv(dev);
161 rcv = priv->peer;
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))
168 goto outf;
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);
176 skb->dst = NULL;
177 skb->mark = 0;
178 secpath_reset(skb);
179 nf_reset(skb);
181 length = skb->len;
183 stats->tx_bytes += length;
184 stats->tx_packets++;
186 stats = per_cpu_ptr(rcv_priv->stats, cpu);
187 stats->rx_bytes += length;
188 stats->rx_packets++;
190 netif_rx(skb);
191 return 0;
193 outf:
194 kfree_skb(skb);
195 stats->tx_dropped++;
196 return 0;
200 * general routines
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;
207 int cpu;
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;
229 return dev_stats;
232 static int veth_open(struct net_device *dev)
234 struct veth_priv *priv;
236 priv = netdev_priv(dev);
237 if (priv->peer == NULL)
238 return -ENOTCONN;
240 if (priv->peer->flags & IFF_UP) {
241 netif_carrier_on(dev);
242 netif_carrier_on(priv->peer);
244 return 0;
247 static int veth_dev_init(struct net_device *dev)
249 struct veth_net_stats *stats;
250 struct veth_priv *priv;
252 stats = alloc_percpu(struct veth_net_stats);
253 if (stats == NULL)
254 return -ENOMEM;
256 priv = netdev_priv(dev);
257 priv->stats = stats;
258 return 0;
261 static void veth_dev_free(struct net_device *dev)
263 struct veth_priv *priv;
265 priv = netdev_priv(dev);
266 free_percpu(priv->stats);
267 free_netdev(dev);
270 static void veth_setup(struct net_device *dev)
272 ether_setup(dev);
274 dev->hard_start_xmit = veth_xmit;
275 dev->get_stats = veth_get_stats;
276 dev->open = veth_open;
277 dev->ethtool_ops = &veth_ethtool_ops;
278 dev->features |= NETIF_F_LLTX;
279 dev->init = veth_dev_init;
280 dev->destructor = veth_dev_free;
283 static void veth_change_state(struct net_device *dev)
285 struct net_device *peer;
286 struct veth_priv *priv;
288 priv = netdev_priv(dev);
289 peer = priv->peer;
291 if (netif_carrier_ok(peer)) {
292 if (!netif_carrier_ok(dev))
293 netif_carrier_on(dev);
294 } else {
295 if (netif_carrier_ok(dev))
296 netif_carrier_off(dev);
300 static int veth_device_event(struct notifier_block *unused,
301 unsigned long event, void *ptr)
303 struct net_device *dev = ptr;
305 if (dev->open != veth_open)
306 goto out;
308 switch (event) {
309 case NETDEV_CHANGE:
310 veth_change_state(dev);
311 break;
313 out:
314 return NOTIFY_DONE;
317 static struct notifier_block veth_notifier_block __read_mostly = {
318 .notifier_call = veth_device_event,
322 * netlink interface
325 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
327 if (tb[IFLA_ADDRESS]) {
328 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
329 return -EINVAL;
330 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
331 return -EADDRNOTAVAIL;
333 return 0;
336 static struct rtnl_link_ops veth_link_ops;
338 static int veth_newlink(struct net_device *dev,
339 struct nlattr *tb[], struct nlattr *data[])
341 int err;
342 struct net_device *peer;
343 struct veth_priv *priv;
344 char ifname[IFNAMSIZ];
345 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
348 * create and register peer first
350 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
351 * skip it since no info from it is useful yet
354 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
355 struct nlattr *nla_peer;
357 nla_peer = data[VETH_INFO_PEER];
358 err = nla_parse(peer_tb, IFLA_MAX,
359 nla_data(nla_peer) + sizeof(struct ifinfomsg),
360 nla_len(nla_peer) - sizeof(struct ifinfomsg),
361 ifla_policy);
362 if (err < 0)
363 return err;
365 err = veth_validate(peer_tb, NULL);
366 if (err < 0)
367 return err;
369 tbp = peer_tb;
370 } else
371 tbp = tb;
373 if (tbp[IFLA_IFNAME])
374 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
375 else
376 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
378 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
379 if (IS_ERR(peer))
380 return PTR_ERR(peer);
382 if (tbp[IFLA_ADDRESS] == NULL)
383 random_ether_addr(peer->dev_addr);
385 err = register_netdevice(peer);
386 if (err < 0)
387 goto err_register_peer;
389 netif_carrier_off(peer);
392 * register dev last
394 * note, that since we've registered new device the dev's name
395 * should be re-allocated
398 if (tb[IFLA_ADDRESS] == NULL)
399 random_ether_addr(dev->dev_addr);
401 if (tb[IFLA_IFNAME])
402 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
403 else
404 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
406 if (strchr(dev->name, '%')) {
407 err = dev_alloc_name(dev, dev->name);
408 if (err < 0)
409 goto err_alloc_name;
412 err = register_netdevice(dev);
413 if (err < 0)
414 goto err_register_dev;
416 netif_carrier_off(dev);
419 * tie the deviced together
422 priv = netdev_priv(dev);
423 priv->dev = dev;
424 priv->peer = peer;
425 list_add(&priv->list, &veth_list);
427 priv = netdev_priv(peer);
428 priv->dev = peer;
429 priv->peer = dev;
430 INIT_LIST_HEAD(&priv->list);
431 return 0;
433 err_register_dev:
434 /* nothing to do */
435 err_alloc_name:
436 unregister_netdevice(peer);
437 return err;
439 err_register_peer:
440 free_netdev(peer);
441 return err;
444 static void veth_dellink(struct net_device *dev)
446 struct veth_priv *priv;
447 struct net_device *peer;
449 priv = netdev_priv(dev);
450 peer = priv->peer;
452 if (!list_empty(&priv->list))
453 list_del(&priv->list);
455 priv = netdev_priv(peer);
456 if (!list_empty(&priv->list))
457 list_del(&priv->list);
459 unregister_netdevice(dev);
460 unregister_netdevice(peer);
463 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
465 static struct rtnl_link_ops veth_link_ops = {
466 .kind = DRV_NAME,
467 .priv_size = sizeof(struct veth_priv),
468 .setup = veth_setup,
469 .validate = veth_validate,
470 .newlink = veth_newlink,
471 .dellink = veth_dellink,
472 .policy = veth_policy,
473 .maxtype = VETH_INFO_MAX,
477 * init/fini
480 static __init int veth_init(void)
482 register_netdevice_notifier(&veth_notifier_block);
483 return rtnl_link_register(&veth_link_ops);
486 static __exit void veth_exit(void)
488 rtnl_link_unregister(&veth_link_ops);
489 unregister_netdevice_notifier(&veth_notifier_block);
492 module_init(veth_init);
493 module_exit(veth_exit);
495 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
496 MODULE_LICENSE("GPL v2");
497 MODULE_ALIAS_RTNL_LINK(DRV_NAME);