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e314dbdc PE |
1 | /* |
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 | ||
e314dbdc PE |
11 | #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> | |
ecef969e | 17 | #include <linux/veth.h> |
e314dbdc PE |
18 | |
19 | #define DRV_NAME "veth" | |
20 | #define DRV_VERSION "1.0" | |
21 | ||
22 | struct veth_net_stats { | |
23 | unsigned long rx_packets; | |
24 | unsigned long tx_packets; | |
25 | unsigned long rx_bytes; | |
26 | unsigned long tx_bytes; | |
27 | unsigned long tx_dropped; | |
28 | }; | |
29 | ||
30 | struct veth_priv { | |
31 | struct net_device *peer; | |
e314dbdc PE |
32 | struct veth_net_stats *stats; |
33 | unsigned ip_summed; | |
34 | }; | |
35 | ||
e314dbdc PE |
36 | /* |
37 | * ethtool interface | |
38 | */ | |
39 | ||
40 | static struct { | |
41 | const char string[ETH_GSTRING_LEN]; | |
42 | } ethtool_stats_keys[] = { | |
43 | { "peer_ifindex" }, | |
44 | }; | |
45 | ||
46 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
47 | { | |
48 | cmd->supported = 0; | |
49 | cmd->advertising = 0; | |
50 | cmd->speed = SPEED_10000; | |
51 | cmd->duplex = DUPLEX_FULL; | |
52 | cmd->port = PORT_TP; | |
53 | cmd->phy_address = 0; | |
54 | cmd->transceiver = XCVR_INTERNAL; | |
55 | cmd->autoneg = AUTONEG_DISABLE; | |
56 | cmd->maxtxpkt = 0; | |
57 | cmd->maxrxpkt = 0; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
62 | { | |
63 | strcpy(info->driver, DRV_NAME); | |
64 | strcpy(info->version, DRV_VERSION); | |
65 | strcpy(info->fw_version, "N/A"); | |
66 | } | |
67 | ||
68 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
69 | { | |
70 | switch(stringset) { | |
71 | case ETH_SS_STATS: | |
72 | memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); | |
73 | break; | |
74 | } | |
75 | } | |
76 | ||
b9f2c044 | 77 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 78 | { |
b9f2c044 JG |
79 | switch (sset) { |
80 | case ETH_SS_STATS: | |
81 | return ARRAY_SIZE(ethtool_stats_keys); | |
82 | default: | |
83 | return -EOPNOTSUPP; | |
84 | } | |
e314dbdc PE |
85 | } |
86 | ||
87 | static void veth_get_ethtool_stats(struct net_device *dev, | |
88 | struct ethtool_stats *stats, u64 *data) | |
89 | { | |
90 | struct veth_priv *priv; | |
91 | ||
92 | priv = netdev_priv(dev); | |
93 | data[0] = priv->peer->ifindex; | |
94 | } | |
95 | ||
96 | static u32 veth_get_rx_csum(struct net_device *dev) | |
97 | { | |
98 | struct veth_priv *priv; | |
99 | ||
100 | priv = netdev_priv(dev); | |
101 | return priv->ip_summed == CHECKSUM_UNNECESSARY; | |
102 | } | |
103 | ||
104 | static int veth_set_rx_csum(struct net_device *dev, u32 data) | |
105 | { | |
106 | struct veth_priv *priv; | |
107 | ||
108 | priv = netdev_priv(dev); | |
109 | priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static u32 veth_get_tx_csum(struct net_device *dev) | |
114 | { | |
115 | return (dev->features & NETIF_F_NO_CSUM) != 0; | |
116 | } | |
117 | ||
118 | static int veth_set_tx_csum(struct net_device *dev, u32 data) | |
119 | { | |
120 | if (data) | |
121 | dev->features |= NETIF_F_NO_CSUM; | |
122 | else | |
123 | dev->features &= ~NETIF_F_NO_CSUM; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static struct ethtool_ops veth_ethtool_ops = { | |
128 | .get_settings = veth_get_settings, | |
129 | .get_drvinfo = veth_get_drvinfo, | |
130 | .get_link = ethtool_op_get_link, | |
131 | .get_rx_csum = veth_get_rx_csum, | |
132 | .set_rx_csum = veth_set_rx_csum, | |
133 | .get_tx_csum = veth_get_tx_csum, | |
134 | .set_tx_csum = veth_set_tx_csum, | |
135 | .get_sg = ethtool_op_get_sg, | |
136 | .set_sg = ethtool_op_set_sg, | |
137 | .get_strings = veth_get_strings, | |
b9f2c044 | 138 | .get_sset_count = veth_get_sset_count, |
e314dbdc PE |
139 | .get_ethtool_stats = veth_get_ethtool_stats, |
140 | }; | |
141 | ||
142 | /* | |
143 | * xmit | |
144 | */ | |
145 | ||
146 | static int veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
147 | { | |
148 | struct net_device *rcv = NULL; | |
149 | struct veth_priv *priv, *rcv_priv; | |
150 | struct veth_net_stats *stats; | |
151 | int length, cpu; | |
152 | ||
153 | skb_orphan(skb); | |
154 | ||
155 | priv = netdev_priv(dev); | |
156 | rcv = priv->peer; | |
157 | rcv_priv = netdev_priv(rcv); | |
158 | ||
159 | cpu = smp_processor_id(); | |
160 | stats = per_cpu_ptr(priv->stats, cpu); | |
161 | ||
162 | if (!(rcv->flags & IFF_UP)) | |
163 | goto outf; | |
164 | ||
165 | skb->pkt_type = PACKET_HOST; | |
166 | skb->protocol = eth_type_trans(skb, rcv); | |
167 | if (dev->features & NETIF_F_NO_CSUM) | |
168 | skb->ip_summed = rcv_priv->ip_summed; | |
169 | ||
170 | dst_release(skb->dst); | |
171 | skb->dst = NULL; | |
172 | skb->mark = 0; | |
173 | secpath_reset(skb); | |
174 | nf_reset(skb); | |
175 | ||
176 | length = skb->len; | |
177 | ||
178 | stats->tx_bytes += length; | |
179 | stats->tx_packets++; | |
180 | ||
181 | stats = per_cpu_ptr(rcv_priv->stats, cpu); | |
182 | stats->rx_bytes += length; | |
183 | stats->rx_packets++; | |
184 | ||
185 | netif_rx(skb); | |
186 | return 0; | |
187 | ||
188 | outf: | |
189 | kfree_skb(skb); | |
190 | stats->tx_dropped++; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * general routines | |
196 | */ | |
197 | ||
198 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
199 | { | |
200 | struct veth_priv *priv; | |
201 | struct net_device_stats *dev_stats; | |
202 | int cpu; | |
203 | struct veth_net_stats *stats; | |
204 | ||
205 | priv = netdev_priv(dev); | |
206 | dev_stats = &dev->stats; | |
207 | ||
208 | dev_stats->rx_packets = 0; | |
209 | dev_stats->tx_packets = 0; | |
210 | dev_stats->rx_bytes = 0; | |
211 | dev_stats->tx_bytes = 0; | |
212 | dev_stats->tx_dropped = 0; | |
213 | ||
214 | for_each_online_cpu(cpu) { | |
215 | stats = per_cpu_ptr(priv->stats, cpu); | |
216 | ||
217 | dev_stats->rx_packets += stats->rx_packets; | |
218 | dev_stats->tx_packets += stats->tx_packets; | |
219 | dev_stats->rx_bytes += stats->rx_bytes; | |
220 | dev_stats->tx_bytes += stats->tx_bytes; | |
221 | dev_stats->tx_dropped += stats->tx_dropped; | |
222 | } | |
223 | ||
224 | return dev_stats; | |
225 | } | |
226 | ||
227 | static 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 | ||
e314dbdc PE |
242 | static int veth_dev_init(struct net_device *dev) |
243 | { | |
244 | struct veth_net_stats *stats; | |
245 | struct veth_priv *priv; | |
246 | ||
247 | stats = alloc_percpu(struct veth_net_stats); | |
248 | if (stats == NULL) | |
249 | return -ENOMEM; | |
250 | ||
251 | priv = netdev_priv(dev); | |
252 | priv->stats = stats; | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static void veth_dev_free(struct net_device *dev) | |
257 | { | |
258 | struct veth_priv *priv; | |
259 | ||
260 | priv = netdev_priv(dev); | |
261 | free_percpu(priv->stats); | |
262 | free_netdev(dev); | |
263 | } | |
264 | ||
4456e7bd SH |
265 | static const struct net_device_ops veth_netdev_ops = { |
266 | .ndo_init = veth_dev_init, | |
267 | .ndo_open = veth_open, | |
00829823 | 268 | .ndo_start_xmit = veth_xmit, |
4456e7bd SH |
269 | .ndo_get_stats = veth_get_stats, |
270 | }; | |
271 | ||
e314dbdc PE |
272 | static void veth_setup(struct net_device *dev) |
273 | { | |
274 | ether_setup(dev); | |
275 | ||
4456e7bd | 276 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
277 | dev->ethtool_ops = &veth_ethtool_ops; |
278 | dev->features |= NETIF_F_LLTX; | |
e314dbdc PE |
279 | dev->destructor = veth_dev_free; |
280 | } | |
281 | ||
c15853f2 DL |
282 | static void veth_change_state(struct net_device *dev) |
283 | { | |
284 | struct net_device *peer; | |
285 | struct veth_priv *priv; | |
286 | ||
287 | priv = netdev_priv(dev); | |
288 | peer = priv->peer; | |
289 | ||
290 | if (netif_carrier_ok(peer)) { | |
291 | if (!netif_carrier_ok(dev)) | |
292 | netif_carrier_on(dev); | |
293 | } else { | |
294 | if (netif_carrier_ok(dev)) | |
295 | netif_carrier_off(dev); | |
296 | } | |
297 | } | |
298 | ||
299 | static int veth_device_event(struct notifier_block *unused, | |
300 | unsigned long event, void *ptr) | |
301 | { | |
302 | struct net_device *dev = ptr; | |
303 | ||
4456e7bd | 304 | if (dev->netdev_ops->ndo_open != veth_open) |
c15853f2 DL |
305 | goto out; |
306 | ||
307 | switch (event) { | |
308 | case NETDEV_CHANGE: | |
309 | veth_change_state(dev); | |
310 | break; | |
311 | } | |
312 | out: | |
313 | return NOTIFY_DONE; | |
314 | } | |
315 | ||
316 | static struct notifier_block veth_notifier_block __read_mostly = { | |
317 | .notifier_call = veth_device_event, | |
318 | }; | |
319 | ||
e314dbdc PE |
320 | /* |
321 | * netlink interface | |
322 | */ | |
323 | ||
324 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
325 | { | |
326 | if (tb[IFLA_ADDRESS]) { | |
327 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
328 | return -EINVAL; | |
329 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
330 | return -EADDRNOTAVAIL; | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
335 | static struct rtnl_link_ops veth_link_ops; | |
336 | ||
337 | static int veth_newlink(struct net_device *dev, | |
338 | struct nlattr *tb[], struct nlattr *data[]) | |
339 | { | |
340 | int err; | |
341 | struct net_device *peer; | |
342 | struct veth_priv *priv; | |
343 | char ifname[IFNAMSIZ]; | |
344 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
345 | ||
346 | /* | |
347 | * create and register peer first | |
348 | * | |
349 | * struct ifinfomsg is at the head of VETH_INFO_PEER, but we | |
350 | * skip it since no info from it is useful yet | |
351 | */ | |
352 | ||
353 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { | |
354 | struct nlattr *nla_peer; | |
355 | ||
356 | nla_peer = data[VETH_INFO_PEER]; | |
357 | err = nla_parse(peer_tb, IFLA_MAX, | |
358 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
359 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
360 | ifla_policy); | |
361 | if (err < 0) | |
362 | return err; | |
363 | ||
364 | err = veth_validate(peer_tb, NULL); | |
365 | if (err < 0) | |
366 | return err; | |
367 | ||
368 | tbp = peer_tb; | |
369 | } else | |
370 | tbp = tb; | |
371 | ||
372 | if (tbp[IFLA_IFNAME]) | |
373 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
374 | else | |
375 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
376 | ||
c346dca1 | 377 | peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp); |
e314dbdc PE |
378 | if (IS_ERR(peer)) |
379 | return PTR_ERR(peer); | |
380 | ||
381 | if (tbp[IFLA_ADDRESS] == NULL) | |
382 | random_ether_addr(peer->dev_addr); | |
383 | ||
384 | err = register_netdevice(peer); | |
385 | if (err < 0) | |
386 | goto err_register_peer; | |
387 | ||
388 | netif_carrier_off(peer); | |
389 | ||
390 | /* | |
391 | * register dev last | |
392 | * | |
393 | * note, that since we've registered new device the dev's name | |
394 | * should be re-allocated | |
395 | */ | |
396 | ||
397 | if (tb[IFLA_ADDRESS] == NULL) | |
398 | random_ether_addr(dev->dev_addr); | |
399 | ||
400 | if (tb[IFLA_IFNAME]) | |
401 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
402 | else | |
403 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
404 | ||
405 | if (strchr(dev->name, '%')) { | |
406 | err = dev_alloc_name(dev, dev->name); | |
407 | if (err < 0) | |
408 | goto err_alloc_name; | |
409 | } | |
410 | ||
411 | err = register_netdevice(dev); | |
412 | if (err < 0) | |
413 | goto err_register_dev; | |
414 | ||
415 | netif_carrier_off(dev); | |
416 | ||
417 | /* | |
418 | * tie the deviced together | |
419 | */ | |
420 | ||
421 | priv = netdev_priv(dev); | |
e314dbdc | 422 | priv->peer = peer; |
e314dbdc PE |
423 | |
424 | priv = netdev_priv(peer); | |
e314dbdc | 425 | priv->peer = dev; |
e314dbdc PE |
426 | return 0; |
427 | ||
428 | err_register_dev: | |
429 | /* nothing to do */ | |
430 | err_alloc_name: | |
431 | unregister_netdevice(peer); | |
432 | return err; | |
433 | ||
434 | err_register_peer: | |
435 | free_netdev(peer); | |
436 | return err; | |
437 | } | |
438 | ||
439 | static void veth_dellink(struct net_device *dev) | |
440 | { | |
441 | struct veth_priv *priv; | |
442 | struct net_device *peer; | |
443 | ||
444 | priv = netdev_priv(dev); | |
445 | peer = priv->peer; | |
446 | ||
e314dbdc PE |
447 | unregister_netdevice(dev); |
448 | unregister_netdevice(peer); | |
449 | } | |
450 | ||
451 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
452 | ||
453 | static struct rtnl_link_ops veth_link_ops = { | |
454 | .kind = DRV_NAME, | |
455 | .priv_size = sizeof(struct veth_priv), | |
456 | .setup = veth_setup, | |
457 | .validate = veth_validate, | |
458 | .newlink = veth_newlink, | |
459 | .dellink = veth_dellink, | |
460 | .policy = veth_policy, | |
461 | .maxtype = VETH_INFO_MAX, | |
462 | }; | |
463 | ||
464 | /* | |
465 | * init/fini | |
466 | */ | |
467 | ||
468 | static __init int veth_init(void) | |
469 | { | |
c15853f2 | 470 | register_netdevice_notifier(&veth_notifier_block); |
e314dbdc PE |
471 | return rtnl_link_register(&veth_link_ops); |
472 | } | |
473 | ||
474 | static __exit void veth_exit(void) | |
475 | { | |
68365458 | 476 | rtnl_link_unregister(&veth_link_ops); |
c15853f2 | 477 | unregister_netdevice_notifier(&veth_notifier_block); |
e314dbdc PE |
478 | } |
479 | ||
480 | module_init(veth_init); | |
481 | module_exit(veth_exit); | |
482 | ||
483 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
484 | MODULE_LICENSE("GPL v2"); | |
485 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |