blob: b583d4968add5064b57417b25f9e67f8a6549240 [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;
Tejun Heo47d74272010-02-16 15:21:08 +000037 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070038 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;
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900156 int length;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700157
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700158 priv = netdev_priv(dev);
159 rcv = priv->peer;
160 rcv_priv = netdev_priv(rcv);
161
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900162 stats = this_cpu_ptr(priv->stats);
163 rcv_stats = this_cpu_ptr(rcv_priv->stats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700164
165 if (!(rcv->flags & IFF_UP))
Eric Biederman38d40812009-03-03 23:36:04 -0800166 goto tx_drop;
167
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700168 if (dev->features & NETIF_F_NO_CSUM)
169 skb->ip_summed = rcv_priv->ip_summed;
170
Arnd Bergmann44540962009-11-26 06:07:08 +0000171 length = skb->len + ETH_HLEN;
172 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
173 goto rx_drop;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700174
175 stats->tx_bytes += length;
176 stats->tx_packets++;
177
Eric Biederman38d40812009-03-03 23:36:04 -0800178 rcv_stats->rx_bytes += length;
179 rcv_stats->rx_packets++;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700180
Patrick McHardy6ed10652009-06-23 06:03:08 +0000181 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700182
Eric Biederman38d40812009-03-03 23:36:04 -0800183tx_drop:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700184 kfree_skb(skb);
185 stats->tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000186 return NETDEV_TX_OK;
Eric Biederman38d40812009-03-03 23:36:04 -0800187
188rx_drop:
189 kfree_skb(skb);
190 rcv_stats->rx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000191 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700192}
193
194/*
195 * general routines
196 */
197
198static struct net_device_stats *veth_get_stats(struct net_device *dev)
199{
David S. Miller11687a12009-06-25 02:45:42 -0700200 struct veth_priv *priv;
David S. Miller11687a12009-06-25 02:45:42 -0700201 int cpu;
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000202 struct veth_net_stats *stats, total = {0};
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700203
David S. Miller11687a12009-06-25 02:45:42 -0700204 priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700205
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000206 for_each_possible_cpu(cpu) {
David S. Miller11687a12009-06-25 02:45:42 -0700207 stats = per_cpu_ptr(priv->stats, cpu);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700208
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000209 total.rx_packets += stats->rx_packets;
210 total.tx_packets += stats->tx_packets;
211 total.rx_bytes += stats->rx_bytes;
212 total.tx_bytes += stats->tx_bytes;
213 total.tx_dropped += stats->tx_dropped;
214 total.rx_dropped += stats->rx_dropped;
David S. Miller11687a12009-06-25 02:45:42 -0700215 }
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000216 dev->stats.rx_packets = total.rx_packets;
217 dev->stats.tx_packets = total.tx_packets;
218 dev->stats.rx_bytes = total.rx_bytes;
219 dev->stats.tx_bytes = total.tx_bytes;
220 dev->stats.tx_dropped = total.tx_dropped;
221 dev->stats.rx_dropped = total.rx_dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700222
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000223 return &dev->stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700224}
225
226static int veth_open(struct net_device *dev)
227{
228 struct veth_priv *priv;
229
230 priv = netdev_priv(dev);
231 if (priv->peer == NULL)
232 return -ENOTCONN;
233
234 if (priv->peer->flags & IFF_UP) {
235 netif_carrier_on(dev);
236 netif_carrier_on(priv->peer);
237 }
238 return 0;
239}
240
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000241static int veth_close(struct net_device *dev)
242{
243 struct veth_priv *priv = netdev_priv(dev);
244
245 netif_carrier_off(dev);
246 netif_carrier_off(priv->peer);
247
248 return 0;
249}
250
Eric Biederman38d40812009-03-03 23:36:04 -0800251static int is_valid_veth_mtu(int new_mtu)
252{
253 return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
254}
255
256static int veth_change_mtu(struct net_device *dev, int new_mtu)
257{
258 if (!is_valid_veth_mtu(new_mtu))
259 return -EINVAL;
260 dev->mtu = new_mtu;
261 return 0;
262}
263
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700264static int veth_dev_init(struct net_device *dev)
265{
Tejun Heo47d74272010-02-16 15:21:08 +0000266 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700267 struct veth_priv *priv;
268
269 stats = alloc_percpu(struct veth_net_stats);
270 if (stats == NULL)
271 return -ENOMEM;
272
273 priv = netdev_priv(dev);
274 priv->stats = stats;
275 return 0;
276}
277
David S. Miller11687a12009-06-25 02:45:42 -0700278static void veth_dev_free(struct net_device *dev)
279{
280 struct veth_priv *priv;
281
282 priv = netdev_priv(dev);
283 free_percpu(priv->stats);
284 free_netdev(dev);
285}
286
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800287static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800288 .ndo_init = veth_dev_init,
289 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000290 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800291 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800292 .ndo_change_mtu = veth_change_mtu,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800293 .ndo_get_stats = veth_get_stats,
294 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800295};
296
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700297static void veth_setup(struct net_device *dev)
298{
299 ether_setup(dev);
300
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800301 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700302 dev->ethtool_ops = &veth_ethtool_ops;
303 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700304 dev->destructor = veth_dev_free;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700305}
306
307/*
308 * netlink interface
309 */
310
311static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
312{
313 if (tb[IFLA_ADDRESS]) {
314 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
315 return -EINVAL;
316 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
317 return -EADDRNOTAVAIL;
318 }
Eric Biederman38d40812009-03-03 23:36:04 -0800319 if (tb[IFLA_MTU]) {
320 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
321 return -EINVAL;
322 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700323 return 0;
324}
325
326static struct rtnl_link_ops veth_link_ops;
327
Eric W. Biederman81adee42009-11-08 00:53:51 -0800328static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700329 struct nlattr *tb[], struct nlattr *data[])
330{
331 int err;
332 struct net_device *peer;
333 struct veth_priv *priv;
334 char ifname[IFNAMSIZ];
335 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
Patrick McHardy3729d502010-02-26 06:34:54 +0000336 struct ifinfomsg *ifmp;
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
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700341 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700342 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
343 struct nlattr *nla_peer;
344
345 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000346 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700347 err = nla_parse(peer_tb, IFLA_MAX,
348 nla_data(nla_peer) + sizeof(struct ifinfomsg),
349 nla_len(nla_peer) - sizeof(struct ifinfomsg),
350 ifla_policy);
351 if (err < 0)
352 return err;
353
354 err = veth_validate(peer_tb, NULL);
355 if (err < 0)
356 return err;
357
358 tbp = peer_tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000359 } else {
360 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700361 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000362 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700363
364 if (tbp[IFLA_IFNAME])
365 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
366 else
367 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
368
Eric W. Biederman81adee42009-11-08 00:53:51 -0800369 net = rtnl_link_get_net(src_net, tbp);
370 if (IS_ERR(net))
371 return PTR_ERR(net);
372
373 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
374 if (IS_ERR(peer)) {
375 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700376 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800377 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700378
379 if (tbp[IFLA_ADDRESS] == NULL)
380 random_ether_addr(peer->dev_addr);
381
382 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800383 put_net(net);
384 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700385 if (err < 0)
386 goto err_register_peer;
387
388 netif_carrier_off(peer);
389
Patrick McHardy3729d502010-02-26 06:34:54 +0000390 err = rtnl_configure_link(peer, ifmp);
391 if (err < 0)
392 goto err_configure_peer;
393
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700394 /*
395 * register dev last
396 *
397 * note, that since we've registered new device the dev's name
398 * should be re-allocated
399 */
400
401 if (tb[IFLA_ADDRESS] == NULL)
402 random_ether_addr(dev->dev_addr);
403
404 if (tb[IFLA_IFNAME])
405 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
406 else
407 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
408
409 if (strchr(dev->name, '%')) {
410 err = dev_alloc_name(dev, dev->name);
411 if (err < 0)
412 goto err_alloc_name;
413 }
414
415 err = register_netdevice(dev);
416 if (err < 0)
417 goto err_register_dev;
418
419 netif_carrier_off(dev);
420
421 /*
422 * tie the deviced together
423 */
424
425 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700426 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700427
428 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700429 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700430 return 0;
431
432err_register_dev:
433 /* nothing to do */
434err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000435err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700436 unregister_netdevice(peer);
437 return err;
438
439err_register_peer:
440 free_netdev(peer);
441 return err;
442}
443
Eric Dumazet23289a32009-10-27 07:06:36 +0000444static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700445{
446 struct veth_priv *priv;
447 struct net_device *peer;
448
449 priv = netdev_priv(dev);
450 peer = priv->peer;
451
Eric Dumazet24540532009-10-30 01:00:27 -0700452 unregister_netdevice_queue(dev, head);
453 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700454}
455
456static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
457
458static struct rtnl_link_ops veth_link_ops = {
459 .kind = DRV_NAME,
460 .priv_size = sizeof(struct veth_priv),
461 .setup = veth_setup,
462 .validate = veth_validate,
463 .newlink = veth_newlink,
464 .dellink = veth_dellink,
465 .policy = veth_policy,
466 .maxtype = VETH_INFO_MAX,
467};
468
469/*
470 * init/fini
471 */
472
473static __init int veth_init(void)
474{
475 return rtnl_link_register(&veth_link_ops);
476}
477
478static __exit void veth_exit(void)
479{
Patrick McHardy68365452008-01-20 17:25:14 -0800480 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700481}
482
483module_init(veth_init);
484module_exit(veth_exit);
485
486MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
487MODULE_LICENSE("GPL v2");
488MODULE_ALIAS_RTNL_LINK(DRV_NAME);