blob: c048f8d27bbf7e43a6ecd0148d1803cdb1515429 [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
Eric Dumazet26811282012-12-29 16:02:43 +000028struct pcpu_vstats {
29 u64 packets;
30 u64 bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -070031 struct u64_stats_sync syncp;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070032};
33
34struct veth_priv {
Eric Dumazet26811282012-12-29 16:02:43 +000035 struct net_device *peer;
36 atomic64_t dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070037};
38
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070039/*
40 * ethtool interface
41 */
42
43static struct {
44 const char string[ETH_GSTRING_LEN];
45} ethtool_stats_keys[] = {
46 { "peer_ifindex" },
47};
48
49static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
50{
51 cmd->supported = 0;
52 cmd->advertising = 0;
David Decotigny70739492011-04-27 18:32:40 +000053 ethtool_cmd_speed_set(cmd, SPEED_10000);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070054 cmd->duplex = DUPLEX_FULL;
55 cmd->port = PORT_TP;
56 cmd->phy_address = 0;
57 cmd->transceiver = XCVR_INTERNAL;
58 cmd->autoneg = AUTONEG_DISABLE;
59 cmd->maxtxpkt = 0;
60 cmd->maxrxpkt = 0;
61 return 0;
62}
63
64static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
65{
Rick Jones33a5ba12011-11-15 14:59:53 +000066 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
67 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070068}
69
70static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
71{
72 switch(stringset) {
73 case ETH_SS_STATS:
74 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
75 break;
76 }
77}
78
Jeff Garzikb9f2c042007-10-03 18:07:32 -070079static int veth_get_sset_count(struct net_device *dev, int sset)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070080{
Jeff Garzikb9f2c042007-10-03 18:07:32 -070081 switch (sset) {
82 case ETH_SS_STATS:
83 return ARRAY_SIZE(ethtool_stats_keys);
84 default:
85 return -EOPNOTSUPP;
86 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070087}
88
89static void veth_get_ethtool_stats(struct net_device *dev,
90 struct ethtool_stats *stats, u64 *data)
91{
92 struct veth_priv *priv;
93
94 priv = netdev_priv(dev);
95 data[0] = priv->peer->ifindex;
96}
97
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070098static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070099 .get_settings = veth_get_settings,
100 .get_drvinfo = veth_get_drvinfo,
101 .get_link = ethtool_op_get_link,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700102 .get_strings = veth_get_strings,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700103 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700104 .get_ethtool_stats = veth_get_ethtool_stats,
105};
106
Stephen Hemminger424efe92009-08-31 19:50:51 +0000107static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700108{
Eric Dumazet26811282012-12-29 16:02:43 +0000109 struct veth_priv *priv = netdev_priv(dev);
110 struct net_device *rcv = priv->peer;
111 int length = skb->len;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700112
Michał Mirosław0b796752010-12-14 12:35:13 +0000113 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
Eric Dumazet26811282012-12-29 16:02:43 +0000114 * will cause bad checksum on forwarded packets
115 */
Michał Mirosława2c725f2011-03-31 01:01:35 +0000116 if (skb->ip_summed == CHECKSUM_NONE &&
117 rcv->features & NETIF_F_RXCSUM)
118 skb->ip_summed = CHECKSUM_UNNECESSARY;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700119
Eric Dumazet26811282012-12-29 16:02:43 +0000120 if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
121 struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700122
Eric Dumazet26811282012-12-29 16:02:43 +0000123 u64_stats_update_begin(&stats->syncp);
124 stats->bytes += length;
125 stats->packets++;
126 u64_stats_update_end(&stats->syncp);
127 } else {
128 atomic64_inc(&priv->dropped);
129 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700130
Patrick McHardy6ed10652009-06-23 06:03:08 +0000131 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700132}
133
134/*
135 * general routines
136 */
137
Eric Dumazet26811282012-12-29 16:02:43 +0000138static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700139{
Eric Dumazetcf05c702011-06-19 22:48:34 -0700140 struct veth_priv *priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700141 int cpu;
David S. Miller11687a12009-06-25 02:45:42 -0700142
Eric Dumazet26811282012-12-29 16:02:43 +0000143 result->packets = 0;
144 result->bytes = 0;
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000145 for_each_possible_cpu(cpu) {
Eric Dumazet26811282012-12-29 16:02:43 +0000146 struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
147 u64 packets, bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700148 unsigned int start;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700149
Eric Dumazetcf05c702011-06-19 22:48:34 -0700150 do {
151 start = u64_stats_fetch_begin_bh(&stats->syncp);
Eric Dumazet26811282012-12-29 16:02:43 +0000152 packets = stats->packets;
153 bytes = stats->bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700154 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
Eric Dumazet26811282012-12-29 16:02:43 +0000155 result->packets += packets;
156 result->bytes += bytes;
David S. Miller11687a12009-06-25 02:45:42 -0700157 }
Eric Dumazet26811282012-12-29 16:02:43 +0000158 return atomic64_read(&priv->dropped);
159}
160
161static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
162 struct rtnl_link_stats64 *tot)
163{
164 struct veth_priv *priv = netdev_priv(dev);
165 struct pcpu_vstats one;
166
167 tot->tx_dropped = veth_stats_one(&one, dev);
168 tot->tx_bytes = one.bytes;
169 tot->tx_packets = one.packets;
170
171 tot->rx_dropped = veth_stats_one(&one, priv->peer);
172 tot->rx_bytes = one.bytes;
173 tot->rx_packets = one.packets;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700174
stephen hemminger6311cc42011-06-08 14:53:59 +0000175 return tot;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700176}
177
178static int veth_open(struct net_device *dev)
179{
180 struct veth_priv *priv;
181
182 priv = netdev_priv(dev);
183 if (priv->peer == NULL)
184 return -ENOTCONN;
185
186 if (priv->peer->flags & IFF_UP) {
187 netif_carrier_on(dev);
188 netif_carrier_on(priv->peer);
189 }
190 return 0;
191}
192
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000193static int veth_close(struct net_device *dev)
194{
195 struct veth_priv *priv = netdev_priv(dev);
196
197 netif_carrier_off(dev);
198 netif_carrier_off(priv->peer);
199
200 return 0;
201}
202
Eric Biederman38d40812009-03-03 23:36:04 -0800203static int is_valid_veth_mtu(int new_mtu)
204{
Eric Dumazet807540b2010-09-23 05:40:09 +0000205 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
Eric Biederman38d40812009-03-03 23:36:04 -0800206}
207
208static int veth_change_mtu(struct net_device *dev, int new_mtu)
209{
210 if (!is_valid_veth_mtu(new_mtu))
211 return -EINVAL;
212 dev->mtu = new_mtu;
213 return 0;
214}
215
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700216static int veth_dev_init(struct net_device *dev)
217{
Eric Dumazet26811282012-12-29 16:02:43 +0000218 dev->vstats = alloc_percpu(struct pcpu_vstats);
219 if (!dev->vstats)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700220 return -ENOMEM;
221
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700222 return 0;
223}
224
David S. Miller11687a12009-06-25 02:45:42 -0700225static void veth_dev_free(struct net_device *dev)
226{
Eric Dumazet26811282012-12-29 16:02:43 +0000227 free_percpu(dev->vstats);
David S. Miller11687a12009-06-25 02:45:42 -0700228 free_netdev(dev);
229}
230
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800231static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800232 .ndo_init = veth_dev_init,
233 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000234 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800235 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800236 .ndo_change_mtu = veth_change_mtu,
stephen hemminger6311cc42011-06-08 14:53:59 +0000237 .ndo_get_stats64 = veth_get_stats64,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800238 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800239};
240
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700241static void veth_setup(struct net_device *dev)
242{
243 ether_setup(dev);
244
Neil Horman550fd082011-07-26 06:05:38 +0000245 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
Hannes Frederic Sowa23ea5a92012-10-30 16:22:01 +0000246 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
Neil Horman550fd082011-07-26 06:05:38 +0000247
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800248 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700249 dev->ethtool_ops = &veth_ethtool_ops;
250 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700251 dev->destructor = veth_dev_free;
Michał Mirosława2c725f2011-03-31 01:01:35 +0000252
Michał Mirosław34324dc2011-11-15 15:29:55 +0000253 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700254}
255
256/*
257 * netlink interface
258 */
259
260static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
261{
262 if (tb[IFLA_ADDRESS]) {
263 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
264 return -EINVAL;
265 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
266 return -EADDRNOTAVAIL;
267 }
Eric Biederman38d40812009-03-03 23:36:04 -0800268 if (tb[IFLA_MTU]) {
269 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
270 return -EINVAL;
271 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700272 return 0;
273}
274
275static struct rtnl_link_ops veth_link_ops;
276
Eric W. Biederman81adee42009-11-08 00:53:51 -0800277static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700278 struct nlattr *tb[], struct nlattr *data[])
279{
280 int err;
281 struct net_device *peer;
282 struct veth_priv *priv;
283 char ifname[IFNAMSIZ];
284 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
Patrick McHardy3729d502010-02-26 06:34:54 +0000285 struct ifinfomsg *ifmp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800286 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700287
288 /*
289 * create and register peer first
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700290 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700291 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
292 struct nlattr *nla_peer;
293
294 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000295 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700296 err = nla_parse(peer_tb, IFLA_MAX,
297 nla_data(nla_peer) + sizeof(struct ifinfomsg),
298 nla_len(nla_peer) - sizeof(struct ifinfomsg),
299 ifla_policy);
300 if (err < 0)
301 return err;
302
303 err = veth_validate(peer_tb, NULL);
304 if (err < 0)
305 return err;
306
307 tbp = peer_tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000308 } else {
309 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700310 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000311 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700312
313 if (tbp[IFLA_IFNAME])
314 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
315 else
316 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
317
Eric W. Biederman81adee42009-11-08 00:53:51 -0800318 net = rtnl_link_get_net(src_net, tbp);
319 if (IS_ERR(net))
320 return PTR_ERR(net);
321
Rami Rosenc0713562012-11-30 01:08:47 +0000322 peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800323 if (IS_ERR(peer)) {
324 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700325 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800326 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700327
328 if (tbp[IFLA_ADDRESS] == NULL)
Danny Kukawkaf2cedb62012-02-15 06:45:39 +0000329 eth_hw_addr_random(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700330
Pavel Emelyanove6f8f1a2012-08-08 21:53:03 +0000331 if (ifmp && (dev->ifindex != 0))
332 peer->ifindex = ifmp->ifi_index;
333
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700334 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800335 put_net(net);
336 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700337 if (err < 0)
338 goto err_register_peer;
339
340 netif_carrier_off(peer);
341
Patrick McHardy3729d502010-02-26 06:34:54 +0000342 err = rtnl_configure_link(peer, ifmp);
343 if (err < 0)
344 goto err_configure_peer;
345
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700346 /*
347 * register dev last
348 *
349 * note, that since we've registered new device the dev's name
350 * should be re-allocated
351 */
352
353 if (tb[IFLA_ADDRESS] == NULL)
Danny Kukawkaf2cedb62012-02-15 06:45:39 +0000354 eth_hw_addr_random(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700355
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000356 if (tb[IFLA_IFNAME])
357 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
358 else
359 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
360
361 if (strchr(dev->name, '%')) {
362 err = dev_alloc_name(dev, dev->name);
363 if (err < 0)
364 goto err_alloc_name;
365 }
366
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700367 err = register_netdevice(dev);
368 if (err < 0)
369 goto err_register_dev;
370
371 netif_carrier_off(dev);
372
373 /*
374 * tie the deviced together
375 */
376
377 priv = netdev_priv(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700378 priv->peer = peer;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700379
380 priv = netdev_priv(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700381 priv->peer = dev;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700382 return 0;
383
384err_register_dev:
385 /* nothing to do */
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000386err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000387err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700388 unregister_netdevice(peer);
389 return err;
390
391err_register_peer:
392 free_netdev(peer);
393 return err;
394}
395
Eric Dumazet23289a32009-10-27 07:06:36 +0000396static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700397{
398 struct veth_priv *priv;
399 struct net_device *peer;
400
401 priv = netdev_priv(dev);
402 peer = priv->peer;
403
Eric Dumazet24540532009-10-30 01:00:27 -0700404 unregister_netdevice_queue(dev, head);
405 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700406}
407
Thomas Graf23711432012-02-15 04:09:46 +0000408static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
409 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
410};
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700411
412static struct rtnl_link_ops veth_link_ops = {
413 .kind = DRV_NAME,
414 .priv_size = sizeof(struct veth_priv),
415 .setup = veth_setup,
416 .validate = veth_validate,
417 .newlink = veth_newlink,
418 .dellink = veth_dellink,
419 .policy = veth_policy,
420 .maxtype = VETH_INFO_MAX,
421};
422
423/*
424 * init/fini
425 */
426
427static __init int veth_init(void)
428{
429 return rtnl_link_register(&veth_link_ops);
430}
431
432static __exit void veth_exit(void)
433{
Patrick McHardy68365452008-01-20 17:25:14 -0800434 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700435}
436
437module_init(veth_init);
438module_exit(veth_exit);
439
440MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
441MODULE_LICENSE("GPL v2");
442MODULE_ALIAS_RTNL_LINK(DRV_NAME);