blob: f9f0730b53d5d411c3f79fc813c8890c87c88f03 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070013#include <linux/ethtool.h>
14#include <linux/etherdevice.h>
15
16#include <net/dst.h>
17#include <net/xfrm.h>
Stephen Hemmingerecef9692007-12-25 17:23:59 -080018#include <linux/veth.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070019
20#define DRV_NAME "veth"
21#define DRV_VERSION "1.0"
22
Eric Biederman38d40812009-03-03 23:36:04 -080023#define MIN_MTU 68 /* Min L3 MTU */
24#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
25#define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */
26
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070027struct veth_net_stats {
28 unsigned long rx_packets;
29 unsigned long tx_packets;
30 unsigned long rx_bytes;
31 unsigned long tx_bytes;
32 unsigned long tx_dropped;
Eric Biederman38d40812009-03-03 23:36:04 -080033 unsigned long rx_dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070034};
35
36struct veth_priv {
37 struct net_device *peer;
Tejun Heo47d74272010-02-16 15:21:08 +000038 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070039 unsigned ip_summed;
40};
41
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070042/*
43 * ethtool interface
44 */
45
46static struct {
47 const char string[ETH_GSTRING_LEN];
48} ethtool_stats_keys[] = {
49 { "peer_ifindex" },
50};
51
52static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
53{
54 cmd->supported = 0;
55 cmd->advertising = 0;
56 cmd->speed = SPEED_10000;
57 cmd->duplex = DUPLEX_FULL;
58 cmd->port = PORT_TP;
59 cmd->phy_address = 0;
60 cmd->transceiver = XCVR_INTERNAL;
61 cmd->autoneg = AUTONEG_DISABLE;
62 cmd->maxtxpkt = 0;
63 cmd->maxrxpkt = 0;
64 return 0;
65}
66
67static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
68{
69 strcpy(info->driver, DRV_NAME);
70 strcpy(info->version, DRV_VERSION);
71 strcpy(info->fw_version, "N/A");
72}
73
74static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
75{
76 switch(stringset) {
77 case ETH_SS_STATS:
78 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
79 break;
80 }
81}
82
Jeff Garzikb9f2c042007-10-03 18:07:32 -070083static int veth_get_sset_count(struct net_device *dev, int sset)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070084{
Jeff Garzikb9f2c042007-10-03 18:07:32 -070085 switch (sset) {
86 case ETH_SS_STATS:
87 return ARRAY_SIZE(ethtool_stats_keys);
88 default:
89 return -EOPNOTSUPP;
90 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070091}
92
93static void veth_get_ethtool_stats(struct net_device *dev,
94 struct ethtool_stats *stats, u64 *data)
95{
96 struct veth_priv *priv;
97
98 priv = netdev_priv(dev);
99 data[0] = priv->peer->ifindex;
100}
101
102static u32 veth_get_rx_csum(struct net_device *dev)
103{
104 struct veth_priv *priv;
105
106 priv = netdev_priv(dev);
107 return priv->ip_summed == CHECKSUM_UNNECESSARY;
108}
109
110static int veth_set_rx_csum(struct net_device *dev, u32 data)
111{
112 struct veth_priv *priv;
113
114 priv = netdev_priv(dev);
115 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
116 return 0;
117}
118
119static u32 veth_get_tx_csum(struct net_device *dev)
120{
121 return (dev->features & NETIF_F_NO_CSUM) != 0;
122}
123
124static int veth_set_tx_csum(struct net_device *dev, u32 data)
125{
126 if (data)
127 dev->features |= NETIF_F_NO_CSUM;
128 else
129 dev->features &= ~NETIF_F_NO_CSUM;
130 return 0;
131}
132
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700133static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700134 .get_settings = veth_get_settings,
135 .get_drvinfo = veth_get_drvinfo,
136 .get_link = ethtool_op_get_link,
137 .get_rx_csum = veth_get_rx_csum,
138 .set_rx_csum = veth_set_rx_csum,
139 .get_tx_csum = veth_get_tx_csum,
140 .set_tx_csum = veth_set_tx_csum,
141 .get_sg = ethtool_op_get_sg,
142 .set_sg = ethtool_op_set_sg,
143 .get_strings = veth_get_strings,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700144 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700145 .get_ethtool_stats = veth_get_ethtool_stats,
146};
147
148/*
149 * xmit
150 */
151
Stephen Hemminger424efe92009-08-31 19:50:51 +0000152static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700153{
154 struct net_device *rcv = NULL;
155 struct veth_priv *priv, *rcv_priv;
Eric Biederman38d40812009-03-03 23:36:04 -0800156 struct veth_net_stats *stats, *rcv_stats;
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900157 int length;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700158
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700159 priv = netdev_priv(dev);
160 rcv = priv->peer;
161 rcv_priv = netdev_priv(rcv);
162
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900163 stats = this_cpu_ptr(priv->stats);
164 rcv_stats = this_cpu_ptr(rcv_priv->stats);
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{
Tejun Heo47d74272010-02-16 15:21:08 +0000267 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700268 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;
Patrick McHardy3729d502010-02-26 06:34:54 +0000337 struct ifinfomsg *ifmp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800338 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700339
340 /*
341 * create and register peer first
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700342 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700343 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
344 struct nlattr *nla_peer;
345
346 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000347 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700348 err = nla_parse(peer_tb, IFLA_MAX,
349 nla_data(nla_peer) + sizeof(struct ifinfomsg),
350 nla_len(nla_peer) - sizeof(struct ifinfomsg),
351 ifla_policy);
352 if (err < 0)
353 return err;
354
355 err = veth_validate(peer_tb, NULL);
356 if (err < 0)
357 return err;
358
359 tbp = peer_tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000360 } else {
361 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700362 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000363 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700364
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
Patrick McHardy3729d502010-02-26 06:34:54 +0000391 err = rtnl_configure_link(peer, ifmp);
392 if (err < 0)
393 goto err_configure_peer;
394
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700395 /*
396 * register dev last
397 *
398 * note, that since we've registered new device the dev's name
399 * should be re-allocated
400 */
401
402 if (tb[IFLA_ADDRESS] == NULL)
403 random_ether_addr(dev->dev_addr);
404
405 if (tb[IFLA_IFNAME])
406 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
407 else
408 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
409
410 if (strchr(dev->name, '%')) {
411 err = dev_alloc_name(dev, dev->name);
412 if (err < 0)
413 goto err_alloc_name;
414 }
415
416 err = register_netdevice(dev);
417 if (err < 0)
418 goto err_register_dev;
419
420 netif_carrier_off(dev);
421
422 /*
423 * tie the deviced together
424 */
425
426 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700427 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700428
429 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700430 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700431 return 0;
432
433err_register_dev:
434 /* nothing to do */
435err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000436err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700437 unregister_netdevice(peer);
438 return err;
439
440err_register_peer:
441 free_netdev(peer);
442 return err;
443}
444
Eric Dumazet23289a32009-10-27 07:06:36 +0000445static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700446{
447 struct veth_priv *priv;
448 struct net_device *peer;
449
450 priv = netdev_priv(dev);
451 peer = priv->peer;
452
Eric Dumazet24540532009-10-30 01:00:27 -0700453 unregister_netdevice_queue(dev, head);
454 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700455}
456
457static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
458
459static struct rtnl_link_ops veth_link_ops = {
460 .kind = DRV_NAME,
461 .priv_size = sizeof(struct veth_priv),
462 .setup = veth_setup,
463 .validate = veth_validate,
464 .newlink = veth_newlink,
465 .dellink = veth_dellink,
466 .policy = veth_policy,
467 .maxtype = VETH_INFO_MAX,
468};
469
470/*
471 * init/fini
472 */
473
474static __init int veth_init(void)
475{
476 return rtnl_link_register(&veth_link_ops);
477}
478
479static __exit void veth_exit(void)
480{
Patrick McHardy68365452008-01-20 17:25:14 -0800481 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700482}
483
484module_init(veth_init);
485module_exit(veth_exit);
486
487MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
488MODULE_LICENSE("GPL v2");
489MODULE_ALIAS_RTNL_LINK(DRV_NAME);