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Commit | Line | Data |
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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 | ||
38d40815 EB |
22 | #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 | ||
e314dbdc PE |
26 | struct 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; | |
38d40815 | 32 | unsigned long rx_dropped; |
e314dbdc PE |
33 | }; |
34 | ||
35 | struct veth_priv { | |
36 | struct net_device *peer; | |
e314dbdc PE |
37 | struct veth_net_stats *stats; |
38 | unsigned ip_summed; | |
39 | }; | |
40 | ||
e314dbdc PE |
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; | |
38d40815 | 155 | struct veth_net_stats *stats, *rcv_stats; |
e314dbdc PE |
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); | |
38d40815 | 166 | rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu); |
e314dbdc PE |
167 | |
168 | if (!(rcv->flags & IFF_UP)) | |
38d40815 EB |
169 | goto tx_drop; |
170 | ||
171 | if (skb->len > (rcv->mtu + MTU_PAD)) | |
172 | goto rx_drop; | |
e314dbdc PE |
173 | |
174 | 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 | ||
179 | dst_release(skb->dst); | |
180 | skb->dst = NULL; | |
181 | skb->mark = 0; | |
182 | secpath_reset(skb); | |
183 | nf_reset(skb); | |
184 | ||
185 | length = skb->len; | |
186 | ||
187 | stats->tx_bytes += length; | |
188 | stats->tx_packets++; | |
189 | ||
38d40815 EB |
190 | rcv_stats->rx_bytes += length; |
191 | rcv_stats->rx_packets++; | |
e314dbdc PE |
192 | |
193 | netif_rx(skb); | |
194 | return 0; | |
195 | ||
38d40815 | 196 | tx_drop: |
e314dbdc PE |
197 | kfree_skb(skb); |
198 | stats->tx_dropped++; | |
199 | return 0; | |
38d40815 EB |
200 | |
201 | rx_drop: | |
202 | kfree_skb(skb); | |
203 | rcv_stats->rx_dropped++; | |
204 | return 0; | |
e314dbdc PE |
205 | } |
206 | ||
207 | /* | |
208 | * general routines | |
209 | */ | |
210 | ||
211 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
212 | { | |
213 | struct veth_priv *priv; | |
214 | struct net_device_stats *dev_stats; | |
215 | int cpu; | |
216 | struct veth_net_stats *stats; | |
217 | ||
218 | priv = netdev_priv(dev); | |
219 | dev_stats = &dev->stats; | |
220 | ||
221 | dev_stats->rx_packets = 0; | |
222 | dev_stats->tx_packets = 0; | |
223 | dev_stats->rx_bytes = 0; | |
224 | dev_stats->tx_bytes = 0; | |
225 | dev_stats->tx_dropped = 0; | |
38d40815 | 226 | dev_stats->rx_dropped = 0; |
e314dbdc PE |
227 | |
228 | for_each_online_cpu(cpu) { | |
229 | stats = per_cpu_ptr(priv->stats, cpu); | |
230 | ||
231 | dev_stats->rx_packets += stats->rx_packets; | |
232 | dev_stats->tx_packets += stats->tx_packets; | |
233 | dev_stats->rx_bytes += stats->rx_bytes; | |
234 | dev_stats->tx_bytes += stats->tx_bytes; | |
235 | dev_stats->tx_dropped += stats->tx_dropped; | |
38d40815 | 236 | dev_stats->rx_dropped += stats->rx_dropped; |
e314dbdc PE |
237 | } |
238 | ||
239 | return dev_stats; | |
240 | } | |
241 | ||
242 | static int veth_open(struct net_device *dev) | |
243 | { | |
244 | struct veth_priv *priv; | |
245 | ||
246 | priv = netdev_priv(dev); | |
247 | if (priv->peer == NULL) | |
248 | return -ENOTCONN; | |
249 | ||
250 | if (priv->peer->flags & IFF_UP) { | |
251 | netif_carrier_on(dev); | |
252 | netif_carrier_on(priv->peer); | |
253 | } | |
254 | return 0; | |
255 | } | |
256 | ||
2cf48a10 EB |
257 | static int veth_close(struct net_device *dev) |
258 | { | |
259 | struct veth_priv *priv = netdev_priv(dev); | |
260 | ||
261 | netif_carrier_off(dev); | |
262 | netif_carrier_off(priv->peer); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
38d40815 EB |
267 | static int is_valid_veth_mtu(int new_mtu) |
268 | { | |
269 | return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU); | |
270 | } | |
271 | ||
272 | static int veth_change_mtu(struct net_device *dev, int new_mtu) | |
273 | { | |
274 | if (!is_valid_veth_mtu(new_mtu)) | |
275 | return -EINVAL; | |
276 | dev->mtu = new_mtu; | |
277 | return 0; | |
278 | } | |
279 | ||
e314dbdc PE |
280 | static int veth_dev_init(struct net_device *dev) |
281 | { | |
282 | struct veth_net_stats *stats; | |
283 | struct veth_priv *priv; | |
284 | ||
285 | stats = alloc_percpu(struct veth_net_stats); | |
286 | if (stats == NULL) | |
287 | return -ENOMEM; | |
288 | ||
289 | priv = netdev_priv(dev); | |
290 | priv->stats = stats; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static void veth_dev_free(struct net_device *dev) | |
295 | { | |
296 | struct veth_priv *priv; | |
297 | ||
298 | priv = netdev_priv(dev); | |
299 | free_percpu(priv->stats); | |
300 | free_netdev(dev); | |
301 | } | |
302 | ||
4456e7bd | 303 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
304 | .ndo_init = veth_dev_init, |
305 | .ndo_open = veth_open, | |
2cf48a10 | 306 | .ndo_stop = veth_close, |
ee923623 | 307 | .ndo_start_xmit = veth_xmit, |
38d40815 | 308 | .ndo_change_mtu = veth_change_mtu, |
ee923623 DL |
309 | .ndo_get_stats = veth_get_stats, |
310 | .ndo_set_mac_address = eth_mac_addr, | |
4456e7bd SH |
311 | }; |
312 | ||
e314dbdc PE |
313 | static void veth_setup(struct net_device *dev) |
314 | { | |
315 | ether_setup(dev); | |
316 | ||
4456e7bd | 317 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
318 | dev->ethtool_ops = &veth_ethtool_ops; |
319 | dev->features |= NETIF_F_LLTX; | |
e314dbdc PE |
320 | dev->destructor = veth_dev_free; |
321 | } | |
322 | ||
323 | /* | |
324 | * netlink interface | |
325 | */ | |
326 | ||
327 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
328 | { | |
329 | if (tb[IFLA_ADDRESS]) { | |
330 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
331 | return -EINVAL; | |
332 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
333 | return -EADDRNOTAVAIL; | |
334 | } | |
38d40815 EB |
335 | if (tb[IFLA_MTU]) { |
336 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
337 | return -EINVAL; | |
338 | } | |
e314dbdc PE |
339 | return 0; |
340 | } | |
341 | ||
342 | static struct rtnl_link_ops veth_link_ops; | |
343 | ||
344 | static int veth_newlink(struct net_device *dev, | |
345 | struct nlattr *tb[], struct nlattr *data[]) | |
346 | { | |
347 | int err; | |
348 | struct net_device *peer; | |
349 | struct veth_priv *priv; | |
350 | char ifname[IFNAMSIZ]; | |
351 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
352 | ||
353 | /* | |
354 | * create and register peer first | |
355 | * | |
356 | * struct ifinfomsg is at the head of VETH_INFO_PEER, but we | |
357 | * skip it since no info from it is useful yet | |
358 | */ | |
359 | ||
360 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { | |
361 | struct nlattr *nla_peer; | |
362 | ||
363 | nla_peer = data[VETH_INFO_PEER]; | |
364 | err = nla_parse(peer_tb, IFLA_MAX, | |
365 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
366 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
367 | ifla_policy); | |
368 | if (err < 0) | |
369 | return err; | |
370 | ||
371 | err = veth_validate(peer_tb, NULL); | |
372 | if (err < 0) | |
373 | return err; | |
374 | ||
375 | tbp = peer_tb; | |
376 | } else | |
377 | tbp = tb; | |
378 | ||
379 | if (tbp[IFLA_IFNAME]) | |
380 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
381 | else | |
382 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
383 | ||
c346dca1 | 384 | peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp); |
e314dbdc PE |
385 | if (IS_ERR(peer)) |
386 | return PTR_ERR(peer); | |
387 | ||
388 | if (tbp[IFLA_ADDRESS] == NULL) | |
389 | random_ether_addr(peer->dev_addr); | |
390 | ||
391 | err = register_netdevice(peer); | |
392 | if (err < 0) | |
393 | goto err_register_peer; | |
394 | ||
395 | netif_carrier_off(peer); | |
396 | ||
397 | /* | |
398 | * register dev last | |
399 | * | |
400 | * note, that since we've registered new device the dev's name | |
401 | * should be re-allocated | |
402 | */ | |
403 | ||
404 | if (tb[IFLA_ADDRESS] == NULL) | |
405 | random_ether_addr(dev->dev_addr); | |
406 | ||
407 | if (tb[IFLA_IFNAME]) | |
408 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
409 | else | |
410 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
411 | ||
412 | if (strchr(dev->name, '%')) { | |
413 | err = dev_alloc_name(dev, dev->name); | |
414 | if (err < 0) | |
415 | goto err_alloc_name; | |
416 | } | |
417 | ||
418 | err = register_netdevice(dev); | |
419 | if (err < 0) | |
420 | goto err_register_dev; | |
421 | ||
422 | netif_carrier_off(dev); | |
423 | ||
424 | /* | |
425 | * tie the deviced together | |
426 | */ | |
427 | ||
428 | priv = netdev_priv(dev); | |
e314dbdc | 429 | priv->peer = peer; |
e314dbdc PE |
430 | |
431 | priv = netdev_priv(peer); | |
e314dbdc | 432 | priv->peer = dev; |
e314dbdc PE |
433 | return 0; |
434 | ||
435 | err_register_dev: | |
436 | /* nothing to do */ | |
437 | err_alloc_name: | |
438 | unregister_netdevice(peer); | |
439 | return err; | |
440 | ||
441 | err_register_peer: | |
442 | free_netdev(peer); | |
443 | return err; | |
444 | } | |
445 | ||
446 | static void veth_dellink(struct net_device *dev) | |
447 | { | |
448 | struct veth_priv *priv; | |
449 | struct net_device *peer; | |
450 | ||
451 | priv = netdev_priv(dev); | |
452 | peer = priv->peer; | |
453 | ||
e314dbdc PE |
454 | unregister_netdevice(dev); |
455 | unregister_netdevice(peer); | |
456 | } | |
457 | ||
458 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
459 | ||
460 | static struct rtnl_link_ops veth_link_ops = { | |
461 | .kind = DRV_NAME, | |
462 | .priv_size = sizeof(struct veth_priv), | |
463 | .setup = veth_setup, | |
464 | .validate = veth_validate, | |
465 | .newlink = veth_newlink, | |
466 | .dellink = veth_dellink, | |
467 | .policy = veth_policy, | |
468 | .maxtype = VETH_INFO_MAX, | |
469 | }; | |
470 | ||
471 | /* | |
472 | * init/fini | |
473 | */ | |
474 | ||
475 | static __init int veth_init(void) | |
476 | { | |
477 | return rtnl_link_register(&veth_link_ops); | |
478 | } | |
479 | ||
480 | static __exit void veth_exit(void) | |
481 | { | |
68365458 | 482 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
483 | } |
484 | ||
485 | module_init(veth_init); | |
486 | module_exit(veth_exit); | |
487 | ||
488 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
489 | MODULE_LICENSE("GPL v2"); | |
490 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |