blob: 49f4667e1fa3c20342b1ca18240a93ece55f9016 [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;
Eric Dumazetcf05c702011-06-19 22:48:34 -070030 u64 rx_bytes;
Eric Dumazet8ce120f2011-11-04 23:19:28 +000031 u64 tx_packets;
Eric Dumazetcf05c702011-06-19 22:48:34 -070032 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{
Rick Jones33a5ba12011-11-15 14:59:53 +000069 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
70 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070071}
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
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700101static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700102 .get_settings = veth_get_settings,
103 .get_drvinfo = veth_get_drvinfo,
104 .get_link = ethtool_op_get_link,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700105 .get_strings = veth_get_strings,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700106 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700107 .get_ethtool_stats = veth_get_ethtool_stats,
108};
109
110/*
111 * xmit
112 */
113
Stephen Hemminger424efe92009-08-31 19:50:51 +0000114static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700115{
116 struct net_device *rcv = NULL;
117 struct veth_priv *priv, *rcv_priv;
Eric Biederman38d40812009-03-03 23:36:04 -0800118 struct veth_net_stats *stats, *rcv_stats;
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900119 int length;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700120
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700121 priv = netdev_priv(dev);
122 rcv = priv->peer;
123 rcv_priv = netdev_priv(rcv);
124
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900125 stats = this_cpu_ptr(priv->stats);
126 rcv_stats = this_cpu_ptr(rcv_priv->stats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700127
Michał Mirosław0b796752010-12-14 12:35:13 +0000128 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
129 will cause bad checksum on forwarded packets */
Michał Mirosława2c725f2011-03-31 01:01:35 +0000130 if (skb->ip_summed == CHECKSUM_NONE &&
131 rcv->features & NETIF_F_RXCSUM)
132 skb->ip_summed = CHECKSUM_UNNECESSARY;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700133
Eric W. Biederman675071a2011-03-21 18:24:53 -0700134 length = skb->len;
Arnd Bergmann44540962009-11-26 06:07:08 +0000135 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
136 goto rx_drop;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700137
Eric Dumazetcf05c702011-06-19 22:48:34 -0700138 u64_stats_update_begin(&stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700139 stats->tx_bytes += length;
140 stats->tx_packets++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700141 u64_stats_update_end(&stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700142
Eric Dumazetcf05c702011-06-19 22:48:34 -0700143 u64_stats_update_begin(&rcv_stats->syncp);
Eric Biederman38d40812009-03-03 23:36:04 -0800144 rcv_stats->rx_bytes += length;
145 rcv_stats->rx_packets++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700146 u64_stats_update_end(&rcv_stats->syncp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700147
Patrick McHardy6ed10652009-06-23 06:03:08 +0000148 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700149
Eric Biederman38d40812009-03-03 23:36:04 -0800150rx_drop:
Eric Dumazetcf05c702011-06-19 22:48:34 -0700151 u64_stats_update_begin(&rcv_stats->syncp);
Eric Biederman38d40812009-03-03 23:36:04 -0800152 rcv_stats->rx_dropped++;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700153 u64_stats_update_end(&rcv_stats->syncp);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000154 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700155}
156
157/*
158 * general routines
159 */
160
stephen hemminger6311cc42011-06-08 14:53:59 +0000161static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
162 struct rtnl_link_stats64 *tot)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700163{
Eric Dumazetcf05c702011-06-19 22:48:34 -0700164 struct veth_priv *priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700165 int cpu;
David S. Miller11687a12009-06-25 02:45:42 -0700166
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000167 for_each_possible_cpu(cpu) {
Eric Dumazetcf05c702011-06-19 22:48:34 -0700168 struct veth_net_stats *stats = per_cpu_ptr(priv->stats, cpu);
169 u64 rx_packets, rx_bytes, rx_dropped;
Eric Dumazet81b16ba2011-07-06 01:51:04 -0700170 u64 tx_packets, tx_bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700171 unsigned int start;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700172
Eric Dumazetcf05c702011-06-19 22:48:34 -0700173 do {
174 start = u64_stats_fetch_begin_bh(&stats->syncp);
175 rx_packets = stats->rx_packets;
176 tx_packets = stats->tx_packets;
177 rx_bytes = stats->rx_bytes;
178 tx_bytes = stats->tx_bytes;
179 rx_dropped = stats->rx_dropped;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700180 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
181 tot->rx_packets += rx_packets;
182 tot->tx_packets += tx_packets;
183 tot->rx_bytes += rx_bytes;
184 tot->tx_bytes += tx_bytes;
185 tot->rx_dropped += rx_dropped;
David S. Miller11687a12009-06-25 02:45:42 -0700186 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700187
stephen hemminger6311cc42011-06-08 14:53:59 +0000188 return tot;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700189}
190
191static int veth_open(struct net_device *dev)
192{
193 struct veth_priv *priv;
194
195 priv = netdev_priv(dev);
196 if (priv->peer == NULL)
197 return -ENOTCONN;
198
199 if (priv->peer->flags & IFF_UP) {
200 netif_carrier_on(dev);
201 netif_carrier_on(priv->peer);
202 }
203 return 0;
204}
205
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000206static int veth_close(struct net_device *dev)
207{
208 struct veth_priv *priv = netdev_priv(dev);
209
210 netif_carrier_off(dev);
211 netif_carrier_off(priv->peer);
212
213 return 0;
214}
215
Eric Biederman38d40812009-03-03 23:36:04 -0800216static int is_valid_veth_mtu(int new_mtu)
217{
Eric Dumazet807540b2010-09-23 05:40:09 +0000218 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
Eric Biederman38d40812009-03-03 23:36:04 -0800219}
220
221static int veth_change_mtu(struct net_device *dev, int new_mtu)
222{
223 if (!is_valid_veth_mtu(new_mtu))
224 return -EINVAL;
225 dev->mtu = new_mtu;
226 return 0;
227}
228
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700229static int veth_dev_init(struct net_device *dev)
230{
Tejun Heo47d74272010-02-16 15:21:08 +0000231 struct veth_net_stats __percpu *stats;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700232 struct veth_priv *priv;
233
234 stats = alloc_percpu(struct veth_net_stats);
235 if (stats == NULL)
236 return -ENOMEM;
237
238 priv = netdev_priv(dev);
239 priv->stats = stats;
240 return 0;
241}
242
David S. Miller11687a12009-06-25 02:45:42 -0700243static void veth_dev_free(struct net_device *dev)
244{
245 struct veth_priv *priv;
246
247 priv = netdev_priv(dev);
248 free_percpu(priv->stats);
249 free_netdev(dev);
250}
251
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800252static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800253 .ndo_init = veth_dev_init,
254 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000255 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800256 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800257 .ndo_change_mtu = veth_change_mtu,
stephen hemminger6311cc42011-06-08 14:53:59 +0000258 .ndo_get_stats64 = veth_get_stats64,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800259 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800260};
261
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700262static void veth_setup(struct net_device *dev)
263{
264 ether_setup(dev);
265
Neil Horman550fd082011-07-26 06:05:38 +0000266 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
267
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800268 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700269 dev->ethtool_ops = &veth_ethtool_ops;
270 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700271 dev->destructor = veth_dev_free;
Michał Mirosława2c725f2011-03-31 01:01:35 +0000272
Michał Mirosław34324dc2011-11-15 15:29:55 +0000273 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700274}
275
276/*
277 * netlink interface
278 */
279
280static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
281{
282 if (tb[IFLA_ADDRESS]) {
283 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
284 return -EINVAL;
285 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
286 return -EADDRNOTAVAIL;
287 }
Eric Biederman38d40812009-03-03 23:36:04 -0800288 if (tb[IFLA_MTU]) {
289 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
290 return -EINVAL;
291 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700292 return 0;
293}
294
295static struct rtnl_link_ops veth_link_ops;
296
Eric W. Biederman81adee42009-11-08 00:53:51 -0800297static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700298 struct nlattr *tb[], struct nlattr *data[])
299{
300 int err;
301 struct net_device *peer;
302 struct veth_priv *priv;
303 char ifname[IFNAMSIZ];
304 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
Patrick McHardy3729d502010-02-26 06:34:54 +0000305 struct ifinfomsg *ifmp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800306 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700307
308 /*
309 * create and register peer first
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700310 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700311 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
312 struct nlattr *nla_peer;
313
314 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000315 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700316 err = nla_parse(peer_tb, IFLA_MAX,
317 nla_data(nla_peer) + sizeof(struct ifinfomsg),
318 nla_len(nla_peer) - sizeof(struct ifinfomsg),
319 ifla_policy);
320 if (err < 0)
321 return err;
322
323 err = veth_validate(peer_tb, NULL);
324 if (err < 0)
325 return err;
326
327 tbp = peer_tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000328 } else {
329 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700330 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000331 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700332
333 if (tbp[IFLA_IFNAME])
334 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
335 else
336 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
337
Eric W. Biederman81adee42009-11-08 00:53:51 -0800338 net = rtnl_link_get_net(src_net, tbp);
339 if (IS_ERR(net))
340 return PTR_ERR(net);
341
342 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
343 if (IS_ERR(peer)) {
344 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700345 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800346 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700347
348 if (tbp[IFLA_ADDRESS] == NULL)
349 random_ether_addr(peer->dev_addr);
350
351 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800352 put_net(net);
353 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700354 if (err < 0)
355 goto err_register_peer;
356
357 netif_carrier_off(peer);
358
Patrick McHardy3729d502010-02-26 06:34:54 +0000359 err = rtnl_configure_link(peer, ifmp);
360 if (err < 0)
361 goto err_configure_peer;
362
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700363 /*
364 * register dev last
365 *
366 * note, that since we've registered new device the dev's name
367 * should be re-allocated
368 */
369
370 if (tb[IFLA_ADDRESS] == NULL)
371 random_ether_addr(dev->dev_addr);
372
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000373 if (tb[IFLA_IFNAME])
374 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
375 else
376 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
377
378 if (strchr(dev->name, '%')) {
379 err = dev_alloc_name(dev, dev->name);
380 if (err < 0)
381 goto err_alloc_name;
382 }
383
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700384 err = register_netdevice(dev);
385 if (err < 0)
386 goto err_register_dev;
387
388 netif_carrier_off(dev);
389
390 /*
391 * tie the deviced together
392 */
393
394 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700395 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700396
397 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700398 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700399 return 0;
400
401err_register_dev:
402 /* nothing to do */
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000403err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000404err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700405 unregister_netdevice(peer);
406 return err;
407
408err_register_peer:
409 free_netdev(peer);
410 return err;
411}
412
Eric Dumazet23289a32009-10-27 07:06:36 +0000413static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700414{
415 struct veth_priv *priv;
416 struct net_device *peer;
417
418 priv = netdev_priv(dev);
419 peer = priv->peer;
420
Eric Dumazet24540532009-10-30 01:00:27 -0700421 unregister_netdevice_queue(dev, head);
422 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700423}
424
425static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
426
427static struct rtnl_link_ops veth_link_ops = {
428 .kind = DRV_NAME,
429 .priv_size = sizeof(struct veth_priv),
430 .setup = veth_setup,
431 .validate = veth_validate,
432 .newlink = veth_newlink,
433 .dellink = veth_dellink,
434 .policy = veth_policy,
435 .maxtype = VETH_INFO_MAX,
436};
437
438/*
439 * init/fini
440 */
441
442static __init int veth_init(void)
443{
444 return rtnl_link_register(&veth_link_ops);
445}
446
447static __exit void veth_exit(void)
448{
Patrick McHardy68365452008-01-20 17:25:14 -0800449 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700450}
451
452module_init(veth_init);
453module_exit(veth_exit);
454
455MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
456MODULE_LICENSE("GPL v2");
457MODULE_ALIAS_RTNL_LINK(DRV_NAME);