Commit | Line | Data |
---|---|---|
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 | 11 | #include <linux/netdevice.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
e314dbdc PE |
13 | #include <linux/ethtool.h> |
14 | #include <linux/etherdevice.h> | |
15 | ||
16 | #include <net/dst.h> | |
17 | #include <net/xfrm.h> | |
ecef969e | 18 | #include <linux/veth.h> |
e314dbdc PE |
19 | |
20 | #define DRV_NAME "veth" | |
21 | #define DRV_VERSION "1.0" | |
22 | ||
38d40815 EB |
23 | #define MIN_MTU 68 /* Min L3 MTU */ |
24 | #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */ | |
25 | #define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */ | |
26 | ||
e314dbdc PE |
27 | struct veth_net_stats { |
28 | unsigned long rx_packets; | |
29 | unsigned long tx_packets; | |
30 | unsigned long rx_bytes; | |
31 | unsigned long tx_bytes; | |
32 | unsigned long tx_dropped; | |
38d40815 | 33 | unsigned long rx_dropped; |
e314dbdc PE |
34 | }; |
35 | ||
36 | struct veth_priv { | |
37 | struct net_device *peer; | |
47d74275 | 38 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
39 | unsigned ip_summed; |
40 | }; | |
41 | ||
e314dbdc PE |
42 | /* |
43 | * ethtool interface | |
44 | */ | |
45 | ||
46 | static struct { | |
47 | const char string[ETH_GSTRING_LEN]; | |
48 | } ethtool_stats_keys[] = { | |
49 | { "peer_ifindex" }, | |
50 | }; | |
51 | ||
52 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
53 | { | |
54 | cmd->supported = 0; | |
55 | cmd->advertising = 0; | |
56 | cmd->speed = SPEED_10000; | |
57 | cmd->duplex = DUPLEX_FULL; | |
58 | cmd->port = PORT_TP; | |
59 | cmd->phy_address = 0; | |
60 | cmd->transceiver = XCVR_INTERNAL; | |
61 | cmd->autoneg = AUTONEG_DISABLE; | |
62 | cmd->maxtxpkt = 0; | |
63 | cmd->maxrxpkt = 0; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
68 | { | |
69 | strcpy(info->driver, DRV_NAME); | |
70 | strcpy(info->version, DRV_VERSION); | |
71 | strcpy(info->fw_version, "N/A"); | |
72 | } | |
73 | ||
74 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
75 | { | |
76 | switch(stringset) { | |
77 | case ETH_SS_STATS: | |
78 | memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); | |
79 | break; | |
80 | } | |
81 | } | |
82 | ||
b9f2c044 | 83 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 84 | { |
b9f2c044 JG |
85 | switch (sset) { |
86 | case ETH_SS_STATS: | |
87 | return ARRAY_SIZE(ethtool_stats_keys); | |
88 | default: | |
89 | return -EOPNOTSUPP; | |
90 | } | |
e314dbdc PE |
91 | } |
92 | ||
93 | static void veth_get_ethtool_stats(struct net_device *dev, | |
94 | struct ethtool_stats *stats, u64 *data) | |
95 | { | |
96 | struct veth_priv *priv; | |
97 | ||
98 | priv = netdev_priv(dev); | |
99 | data[0] = priv->peer->ifindex; | |
100 | } | |
101 | ||
102 | static u32 veth_get_rx_csum(struct net_device *dev) | |
103 | { | |
104 | struct veth_priv *priv; | |
105 | ||
106 | priv = netdev_priv(dev); | |
107 | return priv->ip_summed == CHECKSUM_UNNECESSARY; | |
108 | } | |
109 | ||
110 | static int veth_set_rx_csum(struct net_device *dev, u32 data) | |
111 | { | |
112 | struct veth_priv *priv; | |
113 | ||
114 | priv = netdev_priv(dev); | |
115 | priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static u32 veth_get_tx_csum(struct net_device *dev) | |
120 | { | |
121 | return (dev->features & NETIF_F_NO_CSUM) != 0; | |
122 | } | |
123 | ||
124 | static int veth_set_tx_csum(struct net_device *dev, u32 data) | |
125 | { | |
126 | if (data) | |
127 | dev->features |= NETIF_F_NO_CSUM; | |
128 | else | |
129 | dev->features &= ~NETIF_F_NO_CSUM; | |
130 | return 0; | |
131 | } | |
132 | ||
0fc0b732 | 133 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
134 | .get_settings = veth_get_settings, |
135 | .get_drvinfo = veth_get_drvinfo, | |
136 | .get_link = ethtool_op_get_link, | |
137 | .get_rx_csum = veth_get_rx_csum, | |
138 | .set_rx_csum = veth_set_rx_csum, | |
139 | .get_tx_csum = veth_get_tx_csum, | |
140 | .set_tx_csum = veth_set_tx_csum, | |
141 | .get_sg = ethtool_op_get_sg, | |
142 | .set_sg = ethtool_op_set_sg, | |
143 | .get_strings = veth_get_strings, | |
b9f2c044 | 144 | .get_sset_count = veth_get_sset_count, |
e314dbdc PE |
145 | .get_ethtool_stats = veth_get_ethtool_stats, |
146 | }; | |
147 | ||
148 | /* | |
149 | * xmit | |
150 | */ | |
151 | ||
424efe9c | 152 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
e314dbdc PE |
153 | { |
154 | struct net_device *rcv = NULL; | |
155 | struct veth_priv *priv, *rcv_priv; | |
38d40815 | 156 | struct veth_net_stats *stats, *rcv_stats; |
e7dcaa47 | 157 | int length; |
e314dbdc | 158 | |
e314dbdc PE |
159 | priv = netdev_priv(dev); |
160 | rcv = priv->peer; | |
161 | rcv_priv = netdev_priv(rcv); | |
162 | ||
e7dcaa47 CL |
163 | stats = this_cpu_ptr(priv->stats); |
164 | rcv_stats = this_cpu_ptr(rcv_priv->stats); | |
e314dbdc PE |
165 | |
166 | if (!(rcv->flags & IFF_UP)) | |
38d40815 EB |
167 | goto tx_drop; |
168 | ||
e314dbdc PE |
169 | if (dev->features & NETIF_F_NO_CSUM) |
170 | skb->ip_summed = rcv_priv->ip_summed; | |
171 | ||
44540960 AB |
172 | length = skb->len + ETH_HLEN; |
173 | if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS) | |
174 | goto rx_drop; | |
e314dbdc PE |
175 | |
176 | stats->tx_bytes += length; | |
177 | stats->tx_packets++; | |
178 | ||
38d40815 EB |
179 | rcv_stats->rx_bytes += length; |
180 | rcv_stats->rx_packets++; | |
e314dbdc | 181 | |
6ed10654 | 182 | return NETDEV_TX_OK; |
e314dbdc | 183 | |
38d40815 | 184 | tx_drop: |
e314dbdc PE |
185 | kfree_skb(skb); |
186 | stats->tx_dropped++; | |
6ed10654 | 187 | return NETDEV_TX_OK; |
38d40815 EB |
188 | |
189 | rx_drop: | |
38d40815 | 190 | rcv_stats->rx_dropped++; |
6ed10654 | 191 | return NETDEV_TX_OK; |
e314dbdc PE |
192 | } |
193 | ||
194 | /* | |
195 | * general routines | |
196 | */ | |
197 | ||
198 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
199 | { | |
11687a10 | 200 | struct veth_priv *priv; |
11687a10 | 201 | int cpu; |
2b1c8b0f | 202 | struct veth_net_stats *stats, total = {0}; |
e314dbdc | 203 | |
11687a10 | 204 | priv = netdev_priv(dev); |
e314dbdc | 205 | |
2b1c8b0f | 206 | for_each_possible_cpu(cpu) { |
11687a10 | 207 | stats = per_cpu_ptr(priv->stats, cpu); |
e314dbdc | 208 | |
2b1c8b0f ED |
209 | total.rx_packets += stats->rx_packets; |
210 | total.tx_packets += stats->tx_packets; | |
211 | total.rx_bytes += stats->rx_bytes; | |
212 | total.tx_bytes += stats->tx_bytes; | |
213 | total.tx_dropped += stats->tx_dropped; | |
214 | total.rx_dropped += stats->rx_dropped; | |
11687a10 | 215 | } |
2b1c8b0f ED |
216 | dev->stats.rx_packets = total.rx_packets; |
217 | dev->stats.tx_packets = total.tx_packets; | |
218 | dev->stats.rx_bytes = total.rx_bytes; | |
219 | dev->stats.tx_bytes = total.tx_bytes; | |
220 | dev->stats.tx_dropped = total.tx_dropped; | |
221 | dev->stats.rx_dropped = total.rx_dropped; | |
222 | ||
223 | return &dev->stats; | |
e314dbdc PE |
224 | } |
225 | ||
226 | static int veth_open(struct net_device *dev) | |
227 | { | |
228 | struct veth_priv *priv; | |
229 | ||
230 | priv = netdev_priv(dev); | |
231 | if (priv->peer == NULL) | |
232 | return -ENOTCONN; | |
233 | ||
234 | if (priv->peer->flags & IFF_UP) { | |
235 | netif_carrier_on(dev); | |
236 | netif_carrier_on(priv->peer); | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
2cf48a10 EB |
241 | static int veth_close(struct net_device *dev) |
242 | { | |
243 | struct veth_priv *priv = netdev_priv(dev); | |
244 | ||
245 | netif_carrier_off(dev); | |
246 | netif_carrier_off(priv->peer); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
38d40815 EB |
251 | static int is_valid_veth_mtu(int new_mtu) |
252 | { | |
253 | return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU); | |
254 | } | |
255 | ||
256 | static int veth_change_mtu(struct net_device *dev, int new_mtu) | |
257 | { | |
258 | if (!is_valid_veth_mtu(new_mtu)) | |
259 | return -EINVAL; | |
260 | dev->mtu = new_mtu; | |
261 | return 0; | |
262 | } | |
263 | ||
e314dbdc PE |
264 | static int veth_dev_init(struct net_device *dev) |
265 | { | |
47d74275 | 266 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
267 | struct veth_priv *priv; |
268 | ||
269 | stats = alloc_percpu(struct veth_net_stats); | |
270 | if (stats == NULL) | |
271 | return -ENOMEM; | |
272 | ||
273 | priv = netdev_priv(dev); | |
274 | priv->stats = stats; | |
275 | return 0; | |
276 | } | |
277 | ||
11687a10 DM |
278 | static void veth_dev_free(struct net_device *dev) |
279 | { | |
280 | struct veth_priv *priv; | |
281 | ||
282 | priv = netdev_priv(dev); | |
283 | free_percpu(priv->stats); | |
284 | free_netdev(dev); | |
285 | } | |
286 | ||
4456e7bd | 287 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
288 | .ndo_init = veth_dev_init, |
289 | .ndo_open = veth_open, | |
2cf48a10 | 290 | .ndo_stop = veth_close, |
ee923623 | 291 | .ndo_start_xmit = veth_xmit, |
38d40815 | 292 | .ndo_change_mtu = veth_change_mtu, |
ee923623 DL |
293 | .ndo_get_stats = veth_get_stats, |
294 | .ndo_set_mac_address = eth_mac_addr, | |
4456e7bd SH |
295 | }; |
296 | ||
e314dbdc PE |
297 | static void veth_setup(struct net_device *dev) |
298 | { | |
299 | ether_setup(dev); | |
300 | ||
4456e7bd | 301 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
302 | dev->ethtool_ops = &veth_ethtool_ops; |
303 | dev->features |= NETIF_F_LLTX; | |
11687a10 | 304 | dev->destructor = veth_dev_free; |
e314dbdc PE |
305 | } |
306 | ||
307 | /* | |
308 | * netlink interface | |
309 | */ | |
310 | ||
311 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
312 | { | |
313 | if (tb[IFLA_ADDRESS]) { | |
314 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
315 | return -EINVAL; | |
316 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
317 | return -EADDRNOTAVAIL; | |
318 | } | |
38d40815 EB |
319 | if (tb[IFLA_MTU]) { |
320 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
321 | return -EINVAL; | |
322 | } | |
e314dbdc PE |
323 | return 0; |
324 | } | |
325 | ||
326 | static struct rtnl_link_ops veth_link_ops; | |
327 | ||
81adee47 | 328 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
e314dbdc PE |
329 | struct nlattr *tb[], struct nlattr *data[]) |
330 | { | |
331 | int err; | |
332 | struct net_device *peer; | |
333 | struct veth_priv *priv; | |
334 | char ifname[IFNAMSIZ]; | |
335 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
3729d502 | 336 | struct ifinfomsg *ifmp; |
81adee47 | 337 | struct net *net; |
e314dbdc PE |
338 | |
339 | /* | |
340 | * create and register peer first | |
e314dbdc | 341 | */ |
e314dbdc PE |
342 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
343 | struct nlattr *nla_peer; | |
344 | ||
345 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 346 | ifmp = nla_data(nla_peer); |
e314dbdc PE |
347 | err = nla_parse(peer_tb, IFLA_MAX, |
348 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
349 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
350 | ifla_policy); | |
351 | if (err < 0) | |
352 | return err; | |
353 | ||
354 | err = veth_validate(peer_tb, NULL); | |
355 | if (err < 0) | |
356 | return err; | |
357 | ||
358 | tbp = peer_tb; | |
3729d502 PM |
359 | } else { |
360 | ifmp = NULL; | |
e314dbdc | 361 | tbp = tb; |
3729d502 | 362 | } |
e314dbdc PE |
363 | |
364 | if (tbp[IFLA_IFNAME]) | |
365 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
366 | else | |
367 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
368 | ||
81adee47 EB |
369 | net = rtnl_link_get_net(src_net, tbp); |
370 | if (IS_ERR(net)) | |
371 | return PTR_ERR(net); | |
372 | ||
373 | peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); | |
374 | if (IS_ERR(peer)) { | |
375 | put_net(net); | |
e314dbdc | 376 | return PTR_ERR(peer); |
81adee47 | 377 | } |
e314dbdc PE |
378 | |
379 | if (tbp[IFLA_ADDRESS] == NULL) | |
380 | random_ether_addr(peer->dev_addr); | |
381 | ||
382 | err = register_netdevice(peer); | |
81adee47 EB |
383 | put_net(net); |
384 | net = NULL; | |
e314dbdc PE |
385 | if (err < 0) |
386 | goto err_register_peer; | |
387 | ||
388 | netif_carrier_off(peer); | |
389 | ||
3729d502 PM |
390 | err = rtnl_configure_link(peer, ifmp); |
391 | if (err < 0) | |
392 | goto err_configure_peer; | |
393 | ||
e314dbdc PE |
394 | /* |
395 | * register dev last | |
396 | * | |
397 | * note, that since we've registered new device the dev's name | |
398 | * should be re-allocated | |
399 | */ | |
400 | ||
401 | if (tb[IFLA_ADDRESS] == NULL) | |
402 | random_ether_addr(dev->dev_addr); | |
403 | ||
404 | if (tb[IFLA_IFNAME]) | |
405 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
406 | else | |
407 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
408 | ||
409 | if (strchr(dev->name, '%')) { | |
410 | err = dev_alloc_name(dev, dev->name); | |
411 | if (err < 0) | |
412 | goto err_alloc_name; | |
413 | } | |
414 | ||
415 | err = register_netdevice(dev); | |
416 | if (err < 0) | |
417 | goto err_register_dev; | |
418 | ||
419 | netif_carrier_off(dev); | |
420 | ||
421 | /* | |
422 | * tie the deviced together | |
423 | */ | |
424 | ||
425 | priv = netdev_priv(dev); | |
e314dbdc | 426 | priv->peer = peer; |
e314dbdc PE |
427 | |
428 | priv = netdev_priv(peer); | |
e314dbdc | 429 | priv->peer = dev; |
e314dbdc PE |
430 | return 0; |
431 | ||
432 | err_register_dev: | |
433 | /* nothing to do */ | |
434 | err_alloc_name: | |
3729d502 | 435 | err_configure_peer: |
e314dbdc PE |
436 | unregister_netdevice(peer); |
437 | return err; | |
438 | ||
439 | err_register_peer: | |
440 | free_netdev(peer); | |
441 | return err; | |
442 | } | |
443 | ||
23289a37 | 444 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
445 | { |
446 | struct veth_priv *priv; | |
447 | struct net_device *peer; | |
448 | ||
449 | priv = netdev_priv(dev); | |
450 | peer = priv->peer; | |
451 | ||
24540535 ED |
452 | unregister_netdevice_queue(dev, head); |
453 | unregister_netdevice_queue(peer, head); | |
e314dbdc PE |
454 | } |
455 | ||
456 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
457 | ||
458 | static 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 | ||
473 | static __init int veth_init(void) | |
474 | { | |
475 | return rtnl_link_register(&veth_link_ops); | |
476 | } | |
477 | ||
478 | static __exit void veth_exit(void) | |
479 | { | |
68365458 | 480 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
481 | } |
482 | ||
483 | module_init(veth_init); | |
484 | module_exit(veth_exit); | |
485 | ||
486 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
487 | MODULE_LICENSE("GPL v2"); | |
488 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |