blob: 0c4a811242574e9d6432e83db588ff9122f78a0c [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;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070037 struct veth_net_stats *stats;
38 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
158 skb_orphan(skb);
159
160 priv = netdev_priv(dev);
161 rcv = priv->peer;
162 rcv_priv = netdev_priv(rcv);
163
Christoph Lametere7dcaa42009-10-03 19:48:23 +0900164 stats = this_cpu_ptr(priv->stats);
165 rcv_stats = this_cpu_ptr(rcv_priv->stats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700166
167 if (!(rcv->flags & IFF_UP))
Eric Biederman38d40812009-03-03 23:36:04 -0800168 goto tx_drop;
169
170 if (skb->len > (rcv->mtu + MTU_PAD))
171 goto rx_drop;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700172
Ben Greear27a242e2009-07-21 12:50:02 -0700173 skb->tstamp.tv64 = 0;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700174 skb->pkt_type = PACKET_HOST;
175 skb->protocol = eth_type_trans(skb, rcv);
176 if (dev->features & NETIF_F_NO_CSUM)
177 skb->ip_summed = rcv_priv->ip_summed;
178
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700179 skb->mark = 0;
180 secpath_reset(skb);
181 nf_reset(skb);
182
183 length = skb->len;
184
185 stats->tx_bytes += length;
186 stats->tx_packets++;
187
Eric Biederman38d40812009-03-03 23:36:04 -0800188 rcv_stats->rx_bytes += length;
189 rcv_stats->rx_packets++;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700190
191 netif_rx(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000192 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700193
Eric Biederman38d40812009-03-03 23:36:04 -0800194tx_drop:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700195 kfree_skb(skb);
196 stats->tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000197 return NETDEV_TX_OK;
Eric Biederman38d40812009-03-03 23:36:04 -0800198
199rx_drop:
200 kfree_skb(skb);
201 rcv_stats->rx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000202 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700203}
204
205/*
206 * general routines
207 */
208
209static struct net_device_stats *veth_get_stats(struct net_device *dev)
210{
David S. Miller11687a12009-06-25 02:45:42 -0700211 struct veth_priv *priv;
212 struct net_device_stats *dev_stats;
213 int cpu;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700214 struct veth_net_stats *stats;
215
David S. Miller11687a12009-06-25 02:45:42 -0700216 priv = netdev_priv(dev);
217 dev_stats = &dev->stats;
218
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700219 dev_stats->rx_packets = 0;
220 dev_stats->tx_packets = 0;
221 dev_stats->rx_bytes = 0;
222 dev_stats->tx_bytes = 0;
223 dev_stats->tx_dropped = 0;
Eric Biederman38d40812009-03-03 23:36:04 -0800224 dev_stats->rx_dropped = 0;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700225
David S. Miller11687a12009-06-25 02:45:42 -0700226 for_each_online_cpu(cpu) {
227 stats = per_cpu_ptr(priv->stats, cpu);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700228
David S. Miller11687a12009-06-25 02:45:42 -0700229 dev_stats->rx_packets += stats->rx_packets;
230 dev_stats->tx_packets += stats->tx_packets;
231 dev_stats->rx_bytes += stats->rx_bytes;
232 dev_stats->tx_bytes += stats->tx_bytes;
233 dev_stats->tx_dropped += stats->tx_dropped;
234 dev_stats->rx_dropped += stats->rx_dropped;
235 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700236
237 return dev_stats;
238}
239
240static int veth_open(struct net_device *dev)
241{
242 struct veth_priv *priv;
243
244 priv = netdev_priv(dev);
245 if (priv->peer == NULL)
246 return -ENOTCONN;
247
248 if (priv->peer->flags & IFF_UP) {
249 netif_carrier_on(dev);
250 netif_carrier_on(priv->peer);
251 }
252 return 0;
253}
254
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000255static int veth_close(struct net_device *dev)
256{
257 struct veth_priv *priv = netdev_priv(dev);
258
259 netif_carrier_off(dev);
260 netif_carrier_off(priv->peer);
261
262 return 0;
263}
264
Eric Biederman38d40812009-03-03 23:36:04 -0800265static int is_valid_veth_mtu(int new_mtu)
266{
267 return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
268}
269
270static int veth_change_mtu(struct net_device *dev, int new_mtu)
271{
272 if (!is_valid_veth_mtu(new_mtu))
273 return -EINVAL;
274 dev->mtu = new_mtu;
275 return 0;
276}
277
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700278static int veth_dev_init(struct net_device *dev)
279{
280 struct veth_net_stats *stats;
281 struct veth_priv *priv;
282
283 stats = alloc_percpu(struct veth_net_stats);
284 if (stats == NULL)
285 return -ENOMEM;
286
287 priv = netdev_priv(dev);
288 priv->stats = stats;
289 return 0;
290}
291
David S. Miller11687a12009-06-25 02:45:42 -0700292static void veth_dev_free(struct net_device *dev)
293{
294 struct veth_priv *priv;
295
296 priv = netdev_priv(dev);
297 free_percpu(priv->stats);
298 free_netdev(dev);
299}
300
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800301static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800302 .ndo_init = veth_dev_init,
303 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000304 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800305 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800306 .ndo_change_mtu = veth_change_mtu,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800307 .ndo_get_stats = veth_get_stats,
308 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800309};
310
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700311static void veth_setup(struct net_device *dev)
312{
313 ether_setup(dev);
314
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800315 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700316 dev->ethtool_ops = &veth_ethtool_ops;
317 dev->features |= NETIF_F_LLTX;
David S. Miller11687a12009-06-25 02:45:42 -0700318 dev->destructor = veth_dev_free;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700319}
320
321/*
322 * netlink interface
323 */
324
325static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
326{
327 if (tb[IFLA_ADDRESS]) {
328 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
329 return -EINVAL;
330 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
331 return -EADDRNOTAVAIL;
332 }
Eric Biederman38d40812009-03-03 23:36:04 -0800333 if (tb[IFLA_MTU]) {
334 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
335 return -EINVAL;
336 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700337 return 0;
338}
339
340static struct rtnl_link_ops veth_link_ops;
341
342static int veth_newlink(struct net_device *dev,
343 struct nlattr *tb[], struct nlattr *data[])
344{
345 int err;
346 struct net_device *peer;
347 struct veth_priv *priv;
348 char ifname[IFNAMSIZ];
349 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
350
351 /*
352 * create and register peer first
353 *
354 * struct ifinfomsg is at the head of VETH_INFO_PEER, but we
355 * skip it since no info from it is useful yet
356 */
357
358 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
359 struct nlattr *nla_peer;
360
361 nla_peer = data[VETH_INFO_PEER];
362 err = nla_parse(peer_tb, IFLA_MAX,
363 nla_data(nla_peer) + sizeof(struct ifinfomsg),
364 nla_len(nla_peer) - sizeof(struct ifinfomsg),
365 ifla_policy);
366 if (err < 0)
367 return err;
368
369 err = veth_validate(peer_tb, NULL);
370 if (err < 0)
371 return err;
372
373 tbp = peer_tb;
374 } else
375 tbp = tb;
376
377 if (tbp[IFLA_IFNAME])
378 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
379 else
380 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
381
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900382 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700383 if (IS_ERR(peer))
384 return PTR_ERR(peer);
385
386 if (tbp[IFLA_ADDRESS] == NULL)
387 random_ether_addr(peer->dev_addr);
388
389 err = register_netdevice(peer);
390 if (err < 0)
391 goto err_register_peer;
392
393 netif_carrier_off(peer);
394
395 /*
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:
436 unregister_netdevice(peer);
437 return err;
438
439err_register_peer:
440 free_netdev(peer);
441 return err;
442}
443
444static void veth_dellink(struct net_device *dev)
445{
446 struct veth_priv *priv;
447 struct net_device *peer;
448
449 priv = netdev_priv(dev);
450 peer = priv->peer;
451
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700452 unregister_netdevice(dev);
453 unregister_netdevice(peer);
454}
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);