blob: 63099c58a6ddd7a92f616ca196141becbd7ad463 [file] [log] [blame]
Pavel Emelyanove314dbd2007-09-25 16:14:46 -07001/*
2 * drivers/net/veth.c
3 *
4 * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
5 *
6 * Author: Pavel Emelianov <xemul@openvz.org>
7 * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
8 *
9 */
10
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070011#include <linux/netdevice.h>
12#include <linux/ethtool.h>
13#include <linux/etherdevice.h>
14
15#include <net/dst.h>
16#include <net/xfrm.h>
Stephen Hemmingerecef9692007-12-25 17:23:59 -080017#include <linux/veth.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070018
19#define DRV_NAME "veth"
20#define DRV_VERSION "1.0"
21
Eric Biederman38d40812009-03-03 23:36:04 -080022#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 */
25
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070026struct 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;
Eric Biederman38d40812009-03-03 23:36:04 -080032 unsigned long rx_dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070033};
34
35struct veth_priv {
36 struct net_device *peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070037 struct veth_net_stats *stats;
38 unsigned ip_summed;
39};
40
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070041/*
42 * ethtool interface
43 */
44
45static struct {
46 const char string[ETH_GSTRING_LEN];
47} ethtool_stats_keys[] = {
48 { "peer_ifindex" },
49};
50
51static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
52{
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;
64}
65
66static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
67{
68 strcpy(info->driver, DRV_NAME);
69 strcpy(info->version, DRV_VERSION);
70 strcpy(info->fw_version, "N/A");
71}
72
73static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
74{
75 switch(stringset) {
76 case ETH_SS_STATS:
77 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
78 break;
79 }
80}
81
Jeff Garzikb9f2c042007-10-03 18:07:32 -070082static int veth_get_sset_count(struct net_device *dev, int sset)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070083{
Jeff Garzikb9f2c042007-10-03 18:07:32 -070084 switch (sset) {
85 case ETH_SS_STATS:
86 return ARRAY_SIZE(ethtool_stats_keys);
87 default:
88 return -EOPNOTSUPP;
89 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070090}
91
92static void veth_get_ethtool_stats(struct net_device *dev,
93 struct ethtool_stats *stats, u64 *data)
94{
95 struct veth_priv *priv;
96
97 priv = netdev_priv(dev);
98 data[0] = priv->peer->ifindex;
99}
100
101static u32 veth_get_rx_csum(struct net_device *dev)
102{
103 struct veth_priv *priv;
104
105 priv = netdev_priv(dev);
106 return priv->ip_summed == CHECKSUM_UNNECESSARY;
107}
108
109static int veth_set_rx_csum(struct net_device *dev, u32 data)
110{
111 struct veth_priv *priv;
112
113 priv = netdev_priv(dev);
114 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
115 return 0;
116}
117
118static u32 veth_get_tx_csum(struct net_device *dev)
119{
120 return (dev->features & NETIF_F_NO_CSUM) != 0;
121}
122
123static int veth_set_tx_csum(struct net_device *dev, u32 data)
124{
125 if (data)
126 dev->features |= NETIF_F_NO_CSUM;
127 else
128 dev->features &= ~NETIF_F_NO_CSUM;
129 return 0;
130}
131
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700132static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700133 .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,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700143 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700144 .get_ethtool_stats = veth_get_ethtool_stats,
145};
146
147/*
148 * xmit
149 */
150
Stephen Hemminger424efe92009-08-31 19:50:51 +0000151static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700152{
153 struct net_device *rcv = NULL;
154 struct veth_priv *priv, *rcv_priv;
Eric Biederman38d40812009-03-03 23:36:04 -0800155 struct veth_net_stats *stats, *rcv_stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700156 int length, cpu;
157
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700158 priv = netdev_priv(dev);
159 rcv = priv->peer;
160 rcv_priv = netdev_priv(rcv);
161
162 cpu = smp_processor_id();
163 stats = per_cpu_ptr(priv->stats, cpu);
Eric Biederman38d40812009-03-03 23:36:04 -0800164 rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700165
166 if (!(rcv->flags & IFF_UP))
Eric Biederman38d40812009-03-03 23:36:04 -0800167 goto tx_drop;
168
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700169 if (dev->features & NETIF_F_NO_CSUM)
170 skb->ip_summed = rcv_priv->ip_summed;
171
Arnd Bergmann44540962009-11-26 06:07:08 +0000172 length = skb->len + ETH_HLEN;
173 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
174 goto rx_drop;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700175
176 stats->tx_bytes += length;
177 stats->tx_packets++;
178
Eric Biederman38d40812009-03-03 23:36:04 -0800179 rcv_stats->rx_bytes += length;
180 rcv_stats->rx_packets++;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700181
Patrick McHardy6ed10652009-06-23 06:03:08 +0000182 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700183
Eric Biederman38d40812009-03-03 23:36:04 -0800184tx_drop:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700185 kfree_skb(skb);
186 stats->tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000187 return NETDEV_TX_OK;
Eric Biederman38d40812009-03-03 23:36:04 -0800188
189rx_drop:
190 kfree_skb(skb);
191 rcv_stats->rx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000192 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700193}
194
195/*
196 * general routines
197 */
198
199static struct net_device_stats *veth_get_stats(struct net_device *dev)
200{
David S. Miller11687a12009-06-25 02:45:42 -0700201 struct veth_priv *priv;
David S. Miller11687a12009-06-25 02:45:42 -0700202 int cpu;
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000203 struct veth_net_stats *stats, total = {0};
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700204
David S. Miller11687a12009-06-25 02:45:42 -0700205 priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700206
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000207 for_each_possible_cpu(cpu) {
David S. Miller11687a12009-06-25 02:45:42 -0700208 stats = per_cpu_ptr(priv->stats, cpu);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700209
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000210 total.rx_packets += stats->rx_packets;
211 total.tx_packets += stats->tx_packets;
212 total.rx_bytes += stats->rx_bytes;
213 total.tx_bytes += stats->tx_bytes;
214 total.tx_dropped += stats->tx_dropped;
215 total.rx_dropped += stats->rx_dropped;
David S. Miller11687a12009-06-25 02:45:42 -0700216 }
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000217 dev->stats.rx_packets = total.rx_packets;
218 dev->stats.tx_packets = total.tx_packets;
219 dev->stats.rx_bytes = total.rx_bytes;
220 dev->stats.tx_bytes = total.tx_bytes;
221 dev->stats.tx_dropped = total.tx_dropped;
222 dev->stats.rx_dropped = total.rx_dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700223
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000224 return &dev->stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700225}
226
227static int veth_open(struct net_device *dev)
228{
229 struct veth_priv *priv;
230
231 priv = netdev_priv(dev);
232 if (priv->peer == NULL)
233 return -ENOTCONN;
234
235 if (priv->peer->flags & IFF_UP) {
236 netif_carrier_on(dev);
237 netif_carrier_on(priv->peer);
238 }
239 return 0;
240}
241
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000242static int veth_close(struct net_device *dev)
243{
244 struct veth_priv *priv = netdev_priv(dev);
245
246 netif_carrier_off(dev);
247 netif_carrier_off(priv->peer);
248
249 return 0;
250}
251
Eric Biederman38d40812009-03-03 23:36:04 -0800252static int is_valid_veth_mtu(int new_mtu)
253{
254 return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
255}
256
257static int veth_change_mtu(struct net_device *dev, int new_mtu)
258{
259 if (!is_valid_veth_mtu(new_mtu))
260 return -EINVAL;
261 dev->mtu = new_mtu;
262 return 0;
263}
264
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700265static int veth_dev_init(struct net_device *dev)
266{
267 struct veth_net_stats *stats;
268 struct veth_priv *priv;
269
270 stats = alloc_percpu(struct veth_net_stats);
271 if (stats == NULL)
272 return -ENOMEM;
273
274 priv = netdev_priv(dev);
275 priv->stats = stats;
276 return 0;
277}
278
David S. Miller11687a12009-06-25 02:45:42 -0700279static void veth_dev_free(struct net_device *dev)
280{
281 struct veth_priv *priv;
282
283 priv = netdev_priv(dev);
284 free_percpu(priv->stats);
285 free_netdev(dev);
286}
287
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800288static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800289 .ndo_init = veth_dev_init,
290 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000291 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800292 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800293 .ndo_change_mtu = veth_change_mtu,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800294 .ndo_get_stats = veth_get_stats,
295 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800296};
297
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700298static void veth_setup(struct net_device *dev)
299{
300 ether_setup(dev);
301
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800302 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700303 dev->ethtool_ops = &veth_ethtool_ops;
304 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700305 dev->destructor = veth_dev_free;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700306}
307
308/*
309 * netlink interface
310 */
311
312static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
313{
314 if (tb[IFLA_ADDRESS]) {
315 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
316 return -EINVAL;
317 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
318 return -EADDRNOTAVAIL;
319 }
Eric Biederman38d40812009-03-03 23:36:04 -0800320 if (tb[IFLA_MTU]) {
321 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
322 return -EINVAL;
323 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700324 return 0;
325}
326
327static struct rtnl_link_ops veth_link_ops;
328
Eric W. Biederman81adee42009-11-08 00:53:51 -0800329static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700330 struct nlattr *tb[], struct nlattr *data[])
331{
332 int err;
333 struct net_device *peer;
334 struct veth_priv *priv;
335 char ifname[IFNAMSIZ];
336 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800337 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700338
339 /*
340 * create and register peer first
341 *
342 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
343 * skip it since no info from it is useful yet
344 */
345
346 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
347 struct nlattr *nla_peer;
348
349 nla_peer = data[VETH_INFO_PEER];
350 err = nla_parse(peer_tb, IFLA_MAX,
351 nla_data(nla_peer) + sizeof(struct ifinfomsg),
352 nla_len(nla_peer) - sizeof(struct ifinfomsg),
353 ifla_policy);
354 if (err < 0)
355 return err;
356
357 err = veth_validate(peer_tb, NULL);
358 if (err < 0)
359 return err;
360
361 tbp = peer_tb;
362 } else
363 tbp = tb;
364
365 if (tbp[IFLA_IFNAME])
366 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
367 else
368 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
369
Eric W. Biederman81adee42009-11-08 00:53:51 -0800370 net = rtnl_link_get_net(src_net, tbp);
371 if (IS_ERR(net))
372 return PTR_ERR(net);
373
374 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
375 if (IS_ERR(peer)) {
376 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700377 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800378 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700379
380 if (tbp[IFLA_ADDRESS] == NULL)
381 random_ether_addr(peer->dev_addr);
382
383 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800384 put_net(net);
385 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700386 if (err < 0)
387 goto err_register_peer;
388
389 netif_carrier_off(peer);
390
391 /*
392 * register dev last
393 *
394 * note, that since we've registered new device the dev's name
395 * should be re-allocated
396 */
397
398 if (tb[IFLA_ADDRESS] == NULL)
399 random_ether_addr(dev->dev_addr);
400
401 if (tb[IFLA_IFNAME])
402 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
403 else
404 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
405
406 if (strchr(dev->name, '%')) {
407 err = dev_alloc_name(dev, dev->name);
408 if (err < 0)
409 goto err_alloc_name;
410 }
411
412 err = register_netdevice(dev);
413 if (err < 0)
414 goto err_register_dev;
415
416 netif_carrier_off(dev);
417
418 /*
419 * tie the deviced together
420 */
421
422 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700423 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700424
425 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700426 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700427 return 0;
428
429err_register_dev:
430 /* nothing to do */
431err_alloc_name:
432 unregister_netdevice(peer);
433 return err;
434
435err_register_peer:
436 free_netdev(peer);
437 return err;
438}
439
Eric Dumazet23289a32009-10-27 07:06:36 +0000440static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700441{
442 struct veth_priv *priv;
443 struct net_device *peer;
444
445 priv = netdev_priv(dev);
446 peer = priv->peer;
447
Eric Dumazet24540532009-10-30 01:00:27 -0700448 unregister_netdevice_queue(dev, head);
449 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700450}
451
452static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
453
454static struct rtnl_link_ops veth_link_ops = {
455 .kind = DRV_NAME,
456 .priv_size = sizeof(struct veth_priv),
457 .setup = veth_setup,
458 .validate = veth_validate,
459 .newlink = veth_newlink,
460 .dellink = veth_dellink,
461 .policy = veth_policy,
462 .maxtype = VETH_INFO_MAX,
463};
464
465/*
466 * init/fini
467 */
468
469static __init int veth_init(void)
470{
471 return rtnl_link_register(&veth_link_ops);
472}
473
474static __exit void veth_exit(void)
475{
Patrick McHardy68365452008-01-20 17:25:14 -0800476 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700477}
478
479module_init(veth_init);
480module_exit(veth_exit);
481
482MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
483MODULE_LICENSE("GPL v2");
484MODULE_ALIAS_RTNL_LINK(DRV_NAME);