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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 | ||
11 | #include <linux/list.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/ethtool.h> | |
14 | #include <linux/etherdevice.h> | |
15 | ||
16 | #include <net/dst.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <net/veth.h> | |
19 | ||
20 | #define DRV_NAME "veth" | |
21 | #define DRV_VERSION "1.0" | |
22 | ||
23 | struct veth_net_stats { | |
24 | unsigned long rx_packets; | |
25 | unsigned long tx_packets; | |
26 | unsigned long rx_bytes; | |
27 | unsigned long tx_bytes; | |
28 | unsigned long tx_dropped; | |
29 | }; | |
30 | ||
31 | struct veth_priv { | |
32 | struct net_device *peer; | |
33 | struct net_device *dev; | |
34 | struct list_head list; | |
35 | struct veth_net_stats *stats; | |
36 | unsigned ip_summed; | |
37 | }; | |
38 | ||
39 | static LIST_HEAD(veth_list); | |
40 | ||
41 | /* | |
42 | * ethtool interface | |
43 | */ | |
44 | ||
45 | static struct { | |
46 | const char string[ETH_GSTRING_LEN]; | |
47 | } ethtool_stats_keys[] = { | |
48 | { "peer_ifindex" }, | |
49 | }; | |
50 | ||
51 | static 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 | ||
66 | static 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 | ||
73 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
74 | { | |
75 | switch(stringset) { | |
76 | case ETH_SS_STATS: | |
77 | memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); | |
78 | break; | |
79 | } | |
80 | } | |
81 | ||
b9f2c044 | 82 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 83 | { |
b9f2c044 JG |
84 | switch (sset) { |
85 | case ETH_SS_STATS: | |
86 | return ARRAY_SIZE(ethtool_stats_keys); | |
87 | default: | |
88 | return -EOPNOTSUPP; | |
89 | } | |
e314dbdc PE |
90 | } |
91 | ||
92 | static 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 | ||
101 | static 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 | ||
109 | static 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 | ||
118 | static u32 veth_get_tx_csum(struct net_device *dev) | |
119 | { | |
120 | return (dev->features & NETIF_F_NO_CSUM) != 0; | |
121 | } | |
122 | ||
123 | static 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 | ||
132 | static struct ethtool_ops veth_ethtool_ops = { | |
133 | .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, | |
b9f2c044 | 143 | .get_sset_count = veth_get_sset_count, |
e314dbdc PE |
144 | .get_ethtool_stats = veth_get_ethtool_stats, |
145 | }; | |
146 | ||
147 | /* | |
148 | * xmit | |
149 | */ | |
150 | ||
151 | static int veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
152 | { | |
153 | struct net_device *rcv = NULL; | |
154 | struct veth_priv *priv, *rcv_priv; | |
155 | struct veth_net_stats *stats; | |
156 | int length, cpu; | |
157 | ||
158 | skb_orphan(skb); | |
159 | ||
160 | priv = netdev_priv(dev); | |
161 | rcv = priv->peer; | |
162 | rcv_priv = netdev_priv(rcv); | |
163 | ||
164 | cpu = smp_processor_id(); | |
165 | stats = per_cpu_ptr(priv->stats, cpu); | |
166 | ||
167 | if (!(rcv->flags & IFF_UP)) | |
168 | goto outf; | |
169 | ||
170 | skb->pkt_type = PACKET_HOST; | |
171 | skb->protocol = eth_type_trans(skb, rcv); | |
172 | if (dev->features & NETIF_F_NO_CSUM) | |
173 | skb->ip_summed = rcv_priv->ip_summed; | |
174 | ||
175 | dst_release(skb->dst); | |
176 | skb->dst = NULL; | |
177 | skb->mark = 0; | |
178 | secpath_reset(skb); | |
179 | nf_reset(skb); | |
180 | ||
181 | length = skb->len; | |
182 | ||
183 | stats->tx_bytes += length; | |
184 | stats->tx_packets++; | |
185 | ||
186 | stats = per_cpu_ptr(rcv_priv->stats, cpu); | |
187 | stats->rx_bytes += length; | |
188 | stats->rx_packets++; | |
189 | ||
190 | netif_rx(skb); | |
191 | return 0; | |
192 | ||
193 | outf: | |
194 | kfree_skb(skb); | |
195 | stats->tx_dropped++; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* | |
200 | * general routines | |
201 | */ | |
202 | ||
203 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
204 | { | |
205 | struct veth_priv *priv; | |
206 | struct net_device_stats *dev_stats; | |
207 | int cpu; | |
208 | struct veth_net_stats *stats; | |
209 | ||
210 | priv = netdev_priv(dev); | |
211 | dev_stats = &dev->stats; | |
212 | ||
213 | dev_stats->rx_packets = 0; | |
214 | dev_stats->tx_packets = 0; | |
215 | dev_stats->rx_bytes = 0; | |
216 | dev_stats->tx_bytes = 0; | |
217 | dev_stats->tx_dropped = 0; | |
218 | ||
219 | for_each_online_cpu(cpu) { | |
220 | stats = per_cpu_ptr(priv->stats, cpu); | |
221 | ||
222 | dev_stats->rx_packets += stats->rx_packets; | |
223 | dev_stats->tx_packets += stats->tx_packets; | |
224 | dev_stats->rx_bytes += stats->rx_bytes; | |
225 | dev_stats->tx_bytes += stats->tx_bytes; | |
226 | dev_stats->tx_dropped += stats->tx_dropped; | |
227 | } | |
228 | ||
229 | return dev_stats; | |
230 | } | |
231 | ||
232 | static int veth_open(struct net_device *dev) | |
233 | { | |
234 | struct veth_priv *priv; | |
235 | ||
236 | priv = netdev_priv(dev); | |
237 | if (priv->peer == NULL) | |
238 | return -ENOTCONN; | |
239 | ||
240 | if (priv->peer->flags & IFF_UP) { | |
241 | netif_carrier_on(dev); | |
242 | netif_carrier_on(priv->peer); | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static int veth_close(struct net_device *dev) | |
248 | { | |
249 | struct veth_priv *priv; | |
250 | ||
251 | if (netif_carrier_ok(dev)) { | |
252 | priv = netdev_priv(dev); | |
253 | netif_carrier_off(dev); | |
254 | netif_carrier_off(priv->peer); | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int veth_dev_init(struct net_device *dev) | |
260 | { | |
261 | struct veth_net_stats *stats; | |
262 | struct veth_priv *priv; | |
263 | ||
264 | stats = alloc_percpu(struct veth_net_stats); | |
265 | if (stats == NULL) | |
266 | return -ENOMEM; | |
267 | ||
268 | priv = netdev_priv(dev); | |
269 | priv->stats = stats; | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static void veth_dev_free(struct net_device *dev) | |
274 | { | |
275 | struct veth_priv *priv; | |
276 | ||
277 | priv = netdev_priv(dev); | |
278 | free_percpu(priv->stats); | |
279 | free_netdev(dev); | |
280 | } | |
281 | ||
282 | static void veth_setup(struct net_device *dev) | |
283 | { | |
284 | ether_setup(dev); | |
285 | ||
286 | dev->hard_start_xmit = veth_xmit; | |
287 | dev->get_stats = veth_get_stats; | |
288 | dev->open = veth_open; | |
289 | dev->stop = veth_close; | |
290 | dev->ethtool_ops = &veth_ethtool_ops; | |
291 | dev->features |= NETIF_F_LLTX; | |
292 | dev->init = veth_dev_init; | |
293 | dev->destructor = veth_dev_free; | |
294 | } | |
295 | ||
296 | /* | |
297 | * netlink interface | |
298 | */ | |
299 | ||
300 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
301 | { | |
302 | if (tb[IFLA_ADDRESS]) { | |
303 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
304 | return -EINVAL; | |
305 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
306 | return -EADDRNOTAVAIL; | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static struct rtnl_link_ops veth_link_ops; | |
312 | ||
313 | static int veth_newlink(struct net_device *dev, | |
314 | struct nlattr *tb[], struct nlattr *data[]) | |
315 | { | |
316 | int err; | |
317 | struct net_device *peer; | |
318 | struct veth_priv *priv; | |
319 | char ifname[IFNAMSIZ]; | |
320 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
321 | ||
322 | /* | |
323 | * create and register peer first | |
324 | * | |
325 | * struct ifinfomsg is at the head of VETH_INFO_PEER, but we | |
326 | * skip it since no info from it is useful yet | |
327 | */ | |
328 | ||
329 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { | |
330 | struct nlattr *nla_peer; | |
331 | ||
332 | nla_peer = data[VETH_INFO_PEER]; | |
333 | err = nla_parse(peer_tb, IFLA_MAX, | |
334 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
335 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
336 | ifla_policy); | |
337 | if (err < 0) | |
338 | return err; | |
339 | ||
340 | err = veth_validate(peer_tb, NULL); | |
341 | if (err < 0) | |
342 | return err; | |
343 | ||
344 | tbp = peer_tb; | |
345 | } else | |
346 | tbp = tb; | |
347 | ||
348 | if (tbp[IFLA_IFNAME]) | |
349 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
350 | else | |
351 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
352 | ||
881d966b | 353 | peer = rtnl_create_link(dev->nd_net, ifname, &veth_link_ops, tbp); |
e314dbdc PE |
354 | if (IS_ERR(peer)) |
355 | return PTR_ERR(peer); | |
356 | ||
357 | if (tbp[IFLA_ADDRESS] == NULL) | |
358 | random_ether_addr(peer->dev_addr); | |
359 | ||
360 | err = register_netdevice(peer); | |
361 | if (err < 0) | |
362 | goto err_register_peer; | |
363 | ||
364 | netif_carrier_off(peer); | |
365 | ||
366 | /* | |
367 | * register dev last | |
368 | * | |
369 | * note, that since we've registered new device the dev's name | |
370 | * should be re-allocated | |
371 | */ | |
372 | ||
373 | if (tb[IFLA_ADDRESS] == NULL) | |
374 | random_ether_addr(dev->dev_addr); | |
375 | ||
376 | if (tb[IFLA_IFNAME]) | |
377 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
378 | else | |
379 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
380 | ||
381 | if (strchr(dev->name, '%')) { | |
382 | err = dev_alloc_name(dev, dev->name); | |
383 | if (err < 0) | |
384 | goto err_alloc_name; | |
385 | } | |
386 | ||
387 | err = register_netdevice(dev); | |
388 | if (err < 0) | |
389 | goto err_register_dev; | |
390 | ||
391 | netif_carrier_off(dev); | |
392 | ||
393 | /* | |
394 | * tie the deviced together | |
395 | */ | |
396 | ||
397 | priv = netdev_priv(dev); | |
398 | priv->dev = dev; | |
399 | priv->peer = peer; | |
400 | list_add(&priv->list, &veth_list); | |
401 | ||
402 | priv = netdev_priv(peer); | |
403 | priv->dev = peer; | |
404 | priv->peer = dev; | |
405 | INIT_LIST_HEAD(&priv->list); | |
406 | return 0; | |
407 | ||
408 | err_register_dev: | |
409 | /* nothing to do */ | |
410 | err_alloc_name: | |
411 | unregister_netdevice(peer); | |
412 | return err; | |
413 | ||
414 | err_register_peer: | |
415 | free_netdev(peer); | |
416 | return err; | |
417 | } | |
418 | ||
419 | static void veth_dellink(struct net_device *dev) | |
420 | { | |
421 | struct veth_priv *priv; | |
422 | struct net_device *peer; | |
423 | ||
424 | priv = netdev_priv(dev); | |
425 | peer = priv->peer; | |
426 | ||
427 | if (!list_empty(&priv->list)) | |
428 | list_del(&priv->list); | |
429 | ||
430 | priv = netdev_priv(peer); | |
431 | if (!list_empty(&priv->list)) | |
432 | list_del(&priv->list); | |
433 | ||
434 | unregister_netdevice(dev); | |
435 | unregister_netdevice(peer); | |
436 | } | |
437 | ||
438 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
439 | ||
440 | static struct rtnl_link_ops veth_link_ops = { | |
441 | .kind = DRV_NAME, | |
442 | .priv_size = sizeof(struct veth_priv), | |
443 | .setup = veth_setup, | |
444 | .validate = veth_validate, | |
445 | .newlink = veth_newlink, | |
446 | .dellink = veth_dellink, | |
447 | .policy = veth_policy, | |
448 | .maxtype = VETH_INFO_MAX, | |
449 | }; | |
450 | ||
451 | /* | |
452 | * init/fini | |
453 | */ | |
454 | ||
455 | static __init int veth_init(void) | |
456 | { | |
457 | return rtnl_link_register(&veth_link_ops); | |
458 | } | |
459 | ||
460 | static __exit void veth_exit(void) | |
461 | { | |
462 | struct veth_priv *priv, *next; | |
463 | ||
464 | rtnl_lock(); | |
465 | /* | |
466 | * cannot trust __rtnl_link_unregister() to unregister all | |
467 | * devices, as each ->dellink call will remove two devices | |
468 | * from the list at once. | |
469 | */ | |
470 | list_for_each_entry_safe(priv, next, &veth_list, list) | |
471 | veth_dellink(priv->dev); | |
472 | ||
473 | __rtnl_link_unregister(&veth_link_ops); | |
474 | rtnl_unlock(); | |
475 | } | |
476 | ||
477 | module_init(veth_init); | |
478 | module_exit(veth_exit); | |
479 | ||
480 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
481 | MODULE_LICENSE("GPL v2"); | |
482 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |