blob: ef883e97cee08a557fd3dcc2546535c1ca487372 [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>
Eric Dumazetcf05c702011-06-19 22:48:34 -070015#include <linux/u64_stats_sync.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070016
17#include <net/dst.h>
18#include <net/xfrm.h>
Stephen Hemmingerecef9692007-12-25 17:23:59 -080019#include <linux/veth.h>
Paul Gortmaker9d9779e2011-07-03 15:21:01 -040020#include <linux/module.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070021
22#define DRV_NAME "veth"
23#define DRV_VERSION "1.0"
24
Eric Biederman38d40812009-03-03 23:36:04 -080025#define MIN_MTU 68 /* Min L3 MTU */
26#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
Eric Biederman38d40812009-03-03 23:36:04 -080027
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070028struct veth_net_stats {
Eric Dumazetcf05c702011-06-19 22:48:34 -070029 u64 rx_packets;
30 u64 tx_packets;
31 u64 rx_bytes;
32 u64 tx_bytes;
33 u64 rx_dropped;
Eric Dumazetcf05c702011-06-19 22:48:34 -070034 struct u64_stats_sync syncp;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070035};
36
37struct veth_priv {
38 struct net_device *peer;
Tejun Heo47d74272010-02-16 15:21:08 +000039 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070040};
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;
David Decotigny70739492011-04-27 18:32:40 +000056 ethtool_cmd_speed_set(cmd, SPEED_10000);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070057 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
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700102static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700103 .get_settings = veth_get_settings,
104 .get_drvinfo = veth_get_drvinfo,
105 .get_link = ethtool_op_get_link,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700106 .get_strings = veth_get_strings,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700107 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700108 .get_ethtool_stats = veth_get_ethtool_stats,
109};
110
111/*
112 * xmit
113 */
114
Stephen Hemminger424efe92009-08-31 19:50:51 +0000115static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700116{
117 struct net_device *rcv = NULL;
118 struct veth_priv *priv, *rcv_priv;
Eric Biederman38d40812009-03-03 23:36:04 -0800119 struct veth_net_stats *stats, *rcv_stats;
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900120 int length;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700121
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700122 priv = netdev_priv(dev);
123 rcv = priv->peer;
124 rcv_priv = netdev_priv(rcv);
125
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900126 stats = this_cpu_ptr(priv->stats);
127 rcv_stats = this_cpu_ptr(rcv_priv->stats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700128
Michał Mirosław0b796752010-12-14 12:35:13 +0000129 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
130 will cause bad checksum on forwarded packets */
Michał Mirosława2c725f2011-03-31 01:01:35 +0000131 if (skb->ip_summed == CHECKSUM_NONE &&
132 rcv->features & NETIF_F_RXCSUM)
133 skb->ip_summed = CHECKSUM_UNNECESSARY;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700134
Eric W. Biederman675071a2011-03-21 18:24:53 -0700135 length = skb->len;
Arnd Bergmann44540962009-11-26 06:07:08 +0000136 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
137 goto rx_drop;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700138
Eric Dumazetcf05c702011-06-19 22:48:34 -0700139 u64_stats_update_begin(&stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700140 stats->tx_bytes += length;
141 stats->tx_packets++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700142 u64_stats_update_end(&stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700143
Eric Dumazetcf05c702011-06-19 22:48:34 -0700144 u64_stats_update_begin(&rcv_stats->syncp);
Eric Biederman38d40812009-03-03 23:36:04 -0800145 rcv_stats->rx_bytes += length;
146 rcv_stats->rx_packets++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700147 u64_stats_update_end(&rcv_stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700148
Patrick McHardy6ed10652009-06-23 06:03:08 +0000149 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700150
Eric Biederman38d40812009-03-03 23:36:04 -0800151rx_drop:
Eric Dumazetcf05c702011-06-19 22:48:34 -0700152 u64_stats_update_begin(&rcv_stats->syncp);
Eric Biederman38d40812009-03-03 23:36:04 -0800153 rcv_stats->rx_dropped++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700154 u64_stats_update_end(&rcv_stats->syncp);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000155 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700156}
157
158/*
159 * general routines
160 */
161
stephen hemminger6311cc42011-06-08 14:53:59 +0000162static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
163 struct rtnl_link_stats64 *tot)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700164{
Eric Dumazetcf05c702011-06-19 22:48:34 -0700165 struct veth_priv *priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700166 int cpu;
David S. Miller11687a12009-06-25 02:45:42 -0700167
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000168 for_each_possible_cpu(cpu) {
Eric Dumazetcf05c702011-06-19 22:48:34 -0700169 struct veth_net_stats *stats = per_cpu_ptr(priv->stats, cpu);
170 u64 rx_packets, rx_bytes, rx_dropped;
Eric Dumazet81b16ba2011-07-06 01:51:04 -0700171 u64 tx_packets, tx_bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700172 unsigned int start;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700173
Eric Dumazetcf05c702011-06-19 22:48:34 -0700174 do {
175 start = u64_stats_fetch_begin_bh(&stats->syncp);
176 rx_packets = stats->rx_packets;
177 tx_packets = stats->tx_packets;
178 rx_bytes = stats->rx_bytes;
179 tx_bytes = stats->tx_bytes;
180 rx_dropped = stats->rx_dropped;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700181 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
182 tot->rx_packets += rx_packets;
183 tot->tx_packets += tx_packets;
184 tot->rx_bytes += rx_bytes;
185 tot->tx_bytes += tx_bytes;
186 tot->rx_dropped += rx_dropped;
David S. Miller11687a12009-06-25 02:45:42 -0700187 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700188
stephen hemminger6311cc42011-06-08 14:53:59 +0000189 return tot;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700190}
191
192static int veth_open(struct net_device *dev)
193{
194 struct veth_priv *priv;
195
196 priv = netdev_priv(dev);
197 if (priv->peer == NULL)
198 return -ENOTCONN;
199
200 if (priv->peer->flags & IFF_UP) {
201 netif_carrier_on(dev);
202 netif_carrier_on(priv->peer);
203 }
204 return 0;
205}
206
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000207static int veth_close(struct net_device *dev)
208{
209 struct veth_priv *priv = netdev_priv(dev);
210
211 netif_carrier_off(dev);
212 netif_carrier_off(priv->peer);
213
214 return 0;
215}
216
Eric Biederman38d40812009-03-03 23:36:04 -0800217static int is_valid_veth_mtu(int new_mtu)
218{
Eric Dumazet807540b2010-09-23 05:40:09 +0000219 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
Eric Biederman38d40812009-03-03 23:36:04 -0800220}
221
222static int veth_change_mtu(struct net_device *dev, int new_mtu)
223{
224 if (!is_valid_veth_mtu(new_mtu))
225 return -EINVAL;
226 dev->mtu = new_mtu;
227 return 0;
228}
229
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700230static int veth_dev_init(struct net_device *dev)
231{
Tejun Heo47d74272010-02-16 15:21:08 +0000232 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700233 struct veth_priv *priv;
234
235 stats = alloc_percpu(struct veth_net_stats);
236 if (stats == NULL)
237 return -ENOMEM;
238
239 priv = netdev_priv(dev);
240 priv->stats = stats;
241 return 0;
242}
243
David S. Miller11687a12009-06-25 02:45:42 -0700244static void veth_dev_free(struct net_device *dev)
245{
246 struct veth_priv *priv;
247
248 priv = netdev_priv(dev);
249 free_percpu(priv->stats);
250 free_netdev(dev);
251}
252
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800253static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800254 .ndo_init = veth_dev_init,
255 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000256 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800257 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800258 .ndo_change_mtu = veth_change_mtu,
stephen hemminger6311cc42011-06-08 14:53:59 +0000259 .ndo_get_stats64 = veth_get_stats64,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800260 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800261};
262
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700263static void veth_setup(struct net_device *dev)
264{
265 ether_setup(dev);
266
Neil Horman550fd082011-07-26 06:05:38 +0000267 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
268
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800269 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700270 dev->ethtool_ops = &veth_ethtool_ops;
271 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700272 dev->destructor = veth_dev_free;
Michał Mirosława2c725f2011-03-31 01:01:35 +0000273
274 dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700275}
276
277/*
278 * netlink interface
279 */
280
281static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
282{
283 if (tb[IFLA_ADDRESS]) {
284 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
285 return -EINVAL;
286 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
287 return -EADDRNOTAVAIL;
288 }
Eric Biederman38d40812009-03-03 23:36:04 -0800289 if (tb[IFLA_MTU]) {
290 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
291 return -EINVAL;
292 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700293 return 0;
294}
295
296static struct rtnl_link_ops veth_link_ops;
297
Eric W. Biederman81adee42009-11-08 00:53:51 -0800298static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700299 struct nlattr *tb[], struct nlattr *data[])
300{
301 int err;
302 struct net_device *peer;
303 struct veth_priv *priv;
304 char ifname[IFNAMSIZ];
305 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
Patrick McHardy3729d502010-02-26 06:34:54 +0000306 struct ifinfomsg *ifmp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800307 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700308
309 /*
310 * create and register peer first
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700311 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700312 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
313 struct nlattr *nla_peer;
314
315 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000316 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700317 err = nla_parse(peer_tb, IFLA_MAX,
318 nla_data(nla_peer) + sizeof(struct ifinfomsg),
319 nla_len(nla_peer) - sizeof(struct ifinfomsg),
320 ifla_policy);
321 if (err < 0)
322 return err;
323
324 err = veth_validate(peer_tb, NULL);
325 if (err < 0)
326 return err;
327
328 tbp = peer_tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000329 } else {
330 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700331 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000332 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700333
334 if (tbp[IFLA_IFNAME])
335 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
336 else
337 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
338
Eric W. Biederman81adee42009-11-08 00:53:51 -0800339 net = rtnl_link_get_net(src_net, tbp);
340 if (IS_ERR(net))
341 return PTR_ERR(net);
342
343 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
344 if (IS_ERR(peer)) {
345 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700346 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800347 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700348
349 if (tbp[IFLA_ADDRESS] == NULL)
350 random_ether_addr(peer->dev_addr);
351
352 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800353 put_net(net);
354 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700355 if (err < 0)
356 goto err_register_peer;
357
358 netif_carrier_off(peer);
359
Patrick McHardy3729d502010-02-26 06:34:54 +0000360 err = rtnl_configure_link(peer, ifmp);
361 if (err < 0)
362 goto err_configure_peer;
363
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700364 /*
365 * register dev last
366 *
367 * note, that since we've registered new device the dev's name
368 * should be re-allocated
369 */
370
371 if (tb[IFLA_ADDRESS] == NULL)
372 random_ether_addr(dev->dev_addr);
373
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000374 if (tb[IFLA_IFNAME])
375 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
376 else
377 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
378
379 if (strchr(dev->name, '%')) {
380 err = dev_alloc_name(dev, dev->name);
381 if (err < 0)
382 goto err_alloc_name;
383 }
384
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700385 err = register_netdevice(dev);
386 if (err < 0)
387 goto err_register_dev;
388
389 netif_carrier_off(dev);
390
391 /*
392 * tie the deviced together
393 */
394
395 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700396 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700397
398 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700399 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700400 return 0;
401
402err_register_dev:
403 /* nothing to do */
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000404err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000405err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700406 unregister_netdevice(peer);
407 return err;
408
409err_register_peer:
410 free_netdev(peer);
411 return err;
412}
413
Eric Dumazet23289a32009-10-27 07:06:36 +0000414static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700415{
416 struct veth_priv *priv;
417 struct net_device *peer;
418
419 priv = netdev_priv(dev);
420 peer = priv->peer;
421
Eric Dumazet24540532009-10-30 01:00:27 -0700422 unregister_netdevice_queue(dev, head);
423 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700424}
425
426static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
427
428static struct rtnl_link_ops veth_link_ops = {
429 .kind = DRV_NAME,
430 .priv_size = sizeof(struct veth_priv),
431 .setup = veth_setup,
432 .validate = veth_validate,
433 .newlink = veth_newlink,
434 .dellink = veth_dellink,
435 .policy = veth_policy,
436 .maxtype = VETH_INFO_MAX,
437};
438
439/*
440 * init/fini
441 */
442
443static __init int veth_init(void)
444{
445 return rtnl_link_register(&veth_link_ops);
446}
447
448static __exit void veth_exit(void)
449{
Patrick McHardy68365452008-01-20 17:25:14 -0800450 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700451}
452
453module_init(veth_init);
454module_exit(veth_exit);
455
456MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
457MODULE_LICENSE("GPL v2");
458MODULE_ALIAS_RTNL_LINK(DRV_NAME);