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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 | 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) */ | |
38d40815 | 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; | |
47d74275 | 37 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
38 | }; |
39 | ||
e314dbdc PE |
40 | /* |
41 | * ethtool interface | |
42 | */ | |
43 | ||
44 | static struct { | |
45 | const char string[ETH_GSTRING_LEN]; | |
46 | } ethtool_stats_keys[] = { | |
47 | { "peer_ifindex" }, | |
48 | }; | |
49 | ||
50 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
51 | { | |
52 | cmd->supported = 0; | |
53 | cmd->advertising = 0; | |
70739497 | 54 | ethtool_cmd_speed_set(cmd, SPEED_10000); |
e314dbdc PE |
55 | cmd->duplex = DUPLEX_FULL; |
56 | cmd->port = PORT_TP; | |
57 | cmd->phy_address = 0; | |
58 | cmd->transceiver = XCVR_INTERNAL; | |
59 | cmd->autoneg = AUTONEG_DISABLE; | |
60 | cmd->maxtxpkt = 0; | |
61 | cmd->maxrxpkt = 0; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
66 | { | |
67 | strcpy(info->driver, DRV_NAME); | |
68 | strcpy(info->version, DRV_VERSION); | |
69 | strcpy(info->fw_version, "N/A"); | |
70 | } | |
71 | ||
72 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
73 | { | |
74 | switch(stringset) { | |
75 | case ETH_SS_STATS: | |
76 | memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
b9f2c044 | 81 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 82 | { |
b9f2c044 JG |
83 | switch (sset) { |
84 | case ETH_SS_STATS: | |
85 | return ARRAY_SIZE(ethtool_stats_keys); | |
86 | default: | |
87 | return -EOPNOTSUPP; | |
88 | } | |
e314dbdc PE |
89 | } |
90 | ||
91 | static void veth_get_ethtool_stats(struct net_device *dev, | |
92 | struct ethtool_stats *stats, u64 *data) | |
93 | { | |
94 | struct veth_priv *priv; | |
95 | ||
96 | priv = netdev_priv(dev); | |
97 | data[0] = priv->peer->ifindex; | |
98 | } | |
99 | ||
0fc0b732 | 100 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
101 | .get_settings = veth_get_settings, |
102 | .get_drvinfo = veth_get_drvinfo, | |
103 | .get_link = ethtool_op_get_link, | |
e314dbdc | 104 | .get_strings = veth_get_strings, |
b9f2c044 | 105 | .get_sset_count = veth_get_sset_count, |
e314dbdc PE |
106 | .get_ethtool_stats = veth_get_ethtool_stats, |
107 | }; | |
108 | ||
109 | /* | |
110 | * xmit | |
111 | */ | |
112 | ||
424efe9c | 113 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
e314dbdc PE |
114 | { |
115 | struct net_device *rcv = NULL; | |
116 | struct veth_priv *priv, *rcv_priv; | |
38d40815 | 117 | struct veth_net_stats *stats, *rcv_stats; |
e7dcaa47 | 118 | int length; |
e314dbdc | 119 | |
e314dbdc PE |
120 | priv = netdev_priv(dev); |
121 | rcv = priv->peer; | |
122 | rcv_priv = netdev_priv(rcv); | |
123 | ||
e7dcaa47 CL |
124 | stats = this_cpu_ptr(priv->stats); |
125 | rcv_stats = this_cpu_ptr(rcv_priv->stats); | |
e314dbdc PE |
126 | |
127 | if (!(rcv->flags & IFF_UP)) | |
38d40815 EB |
128 | goto tx_drop; |
129 | ||
0b796750 MM |
130 | /* don't change ip_summed == CHECKSUM_PARTIAL, as that |
131 | will cause bad checksum on forwarded packets */ | |
a2c725fa MM |
132 | if (skb->ip_summed == CHECKSUM_NONE && |
133 | rcv->features & NETIF_F_RXCSUM) | |
134 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
e314dbdc | 135 | |
675071a2 | 136 | length = skb->len; |
44540960 AB |
137 | if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS) |
138 | goto rx_drop; | |
e314dbdc PE |
139 | |
140 | stats->tx_bytes += length; | |
141 | stats->tx_packets++; | |
142 | ||
38d40815 EB |
143 | rcv_stats->rx_bytes += length; |
144 | rcv_stats->rx_packets++; | |
e314dbdc | 145 | |
6ed10654 | 146 | return NETDEV_TX_OK; |
e314dbdc | 147 | |
38d40815 | 148 | tx_drop: |
e314dbdc PE |
149 | kfree_skb(skb); |
150 | stats->tx_dropped++; | |
6ed10654 | 151 | return NETDEV_TX_OK; |
38d40815 EB |
152 | |
153 | rx_drop: | |
38d40815 | 154 | rcv_stats->rx_dropped++; |
6ed10654 | 155 | return NETDEV_TX_OK; |
e314dbdc PE |
156 | } |
157 | ||
158 | /* | |
159 | * general routines | |
160 | */ | |
161 | ||
162 | static struct net_device_stats *veth_get_stats(struct net_device *dev) | |
163 | { | |
11687a10 | 164 | struct veth_priv *priv; |
11687a10 | 165 | int cpu; |
2b1c8b0f | 166 | struct veth_net_stats *stats, total = {0}; |
e314dbdc | 167 | |
11687a10 | 168 | priv = netdev_priv(dev); |
e314dbdc | 169 | |
2b1c8b0f | 170 | for_each_possible_cpu(cpu) { |
11687a10 | 171 | stats = per_cpu_ptr(priv->stats, cpu); |
e314dbdc | 172 | |
2b1c8b0f ED |
173 | total.rx_packets += stats->rx_packets; |
174 | total.tx_packets += stats->tx_packets; | |
175 | total.rx_bytes += stats->rx_bytes; | |
176 | total.tx_bytes += stats->tx_bytes; | |
177 | total.tx_dropped += stats->tx_dropped; | |
178 | total.rx_dropped += stats->rx_dropped; | |
11687a10 | 179 | } |
2b1c8b0f ED |
180 | dev->stats.rx_packets = total.rx_packets; |
181 | dev->stats.tx_packets = total.tx_packets; | |
182 | dev->stats.rx_bytes = total.rx_bytes; | |
183 | dev->stats.tx_bytes = total.tx_bytes; | |
184 | dev->stats.tx_dropped = total.tx_dropped; | |
185 | dev->stats.rx_dropped = total.rx_dropped; | |
186 | ||
187 | return &dev->stats; | |
e314dbdc PE |
188 | } |
189 | ||
190 | static int veth_open(struct net_device *dev) | |
191 | { | |
192 | struct veth_priv *priv; | |
193 | ||
194 | priv = netdev_priv(dev); | |
195 | if (priv->peer == NULL) | |
196 | return -ENOTCONN; | |
197 | ||
198 | if (priv->peer->flags & IFF_UP) { | |
199 | netif_carrier_on(dev); | |
200 | netif_carrier_on(priv->peer); | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | ||
2cf48a10 EB |
205 | static int veth_close(struct net_device *dev) |
206 | { | |
207 | struct veth_priv *priv = netdev_priv(dev); | |
208 | ||
209 | netif_carrier_off(dev); | |
210 | netif_carrier_off(priv->peer); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
38d40815 EB |
215 | static int is_valid_veth_mtu(int new_mtu) |
216 | { | |
807540ba | 217 | return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU; |
38d40815 EB |
218 | } |
219 | ||
220 | static int veth_change_mtu(struct net_device *dev, int new_mtu) | |
221 | { | |
222 | if (!is_valid_veth_mtu(new_mtu)) | |
223 | return -EINVAL; | |
224 | dev->mtu = new_mtu; | |
225 | return 0; | |
226 | } | |
227 | ||
e314dbdc PE |
228 | static int veth_dev_init(struct net_device *dev) |
229 | { | |
47d74275 | 230 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
231 | struct veth_priv *priv; |
232 | ||
233 | stats = alloc_percpu(struct veth_net_stats); | |
234 | if (stats == NULL) | |
235 | return -ENOMEM; | |
236 | ||
237 | priv = netdev_priv(dev); | |
238 | priv->stats = stats; | |
239 | return 0; | |
240 | } | |
241 | ||
11687a10 DM |
242 | static void veth_dev_free(struct net_device *dev) |
243 | { | |
244 | struct veth_priv *priv; | |
245 | ||
246 | priv = netdev_priv(dev); | |
247 | free_percpu(priv->stats); | |
248 | free_netdev(dev); | |
249 | } | |
250 | ||
4456e7bd | 251 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
252 | .ndo_init = veth_dev_init, |
253 | .ndo_open = veth_open, | |
2cf48a10 | 254 | .ndo_stop = veth_close, |
ee923623 | 255 | .ndo_start_xmit = veth_xmit, |
38d40815 | 256 | .ndo_change_mtu = veth_change_mtu, |
ee923623 DL |
257 | .ndo_get_stats = veth_get_stats, |
258 | .ndo_set_mac_address = eth_mac_addr, | |
4456e7bd SH |
259 | }; |
260 | ||
e314dbdc PE |
261 | static void veth_setup(struct net_device *dev) |
262 | { | |
263 | ether_setup(dev); | |
264 | ||
4456e7bd | 265 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
266 | dev->ethtool_ops = &veth_ethtool_ops; |
267 | dev->features |= NETIF_F_LLTX; | |
11687a10 | 268 | dev->destructor = veth_dev_free; |
a2c725fa MM |
269 | |
270 | dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM; | |
e314dbdc PE |
271 | } |
272 | ||
273 | /* | |
274 | * netlink interface | |
275 | */ | |
276 | ||
277 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
278 | { | |
279 | if (tb[IFLA_ADDRESS]) { | |
280 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
281 | return -EINVAL; | |
282 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
283 | return -EADDRNOTAVAIL; | |
284 | } | |
38d40815 EB |
285 | if (tb[IFLA_MTU]) { |
286 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
287 | return -EINVAL; | |
288 | } | |
e314dbdc PE |
289 | return 0; |
290 | } | |
291 | ||
292 | static struct rtnl_link_ops veth_link_ops; | |
293 | ||
81adee47 | 294 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
e314dbdc PE |
295 | struct nlattr *tb[], struct nlattr *data[]) |
296 | { | |
297 | int err; | |
298 | struct net_device *peer; | |
299 | struct veth_priv *priv; | |
300 | char ifname[IFNAMSIZ]; | |
301 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
3729d502 | 302 | struct ifinfomsg *ifmp; |
81adee47 | 303 | struct net *net; |
e314dbdc PE |
304 | |
305 | /* | |
306 | * create and register peer first | |
e314dbdc | 307 | */ |
e314dbdc PE |
308 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
309 | struct nlattr *nla_peer; | |
310 | ||
311 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 312 | ifmp = nla_data(nla_peer); |
e314dbdc PE |
313 | err = nla_parse(peer_tb, IFLA_MAX, |
314 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
315 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
316 | ifla_policy); | |
317 | if (err < 0) | |
318 | return err; | |
319 | ||
320 | err = veth_validate(peer_tb, NULL); | |
321 | if (err < 0) | |
322 | return err; | |
323 | ||
324 | tbp = peer_tb; | |
3729d502 PM |
325 | } else { |
326 | ifmp = NULL; | |
e314dbdc | 327 | tbp = tb; |
3729d502 | 328 | } |
e314dbdc PE |
329 | |
330 | if (tbp[IFLA_IFNAME]) | |
331 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
332 | else | |
333 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
334 | ||
81adee47 EB |
335 | net = rtnl_link_get_net(src_net, tbp); |
336 | if (IS_ERR(net)) | |
337 | return PTR_ERR(net); | |
338 | ||
339 | peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); | |
340 | if (IS_ERR(peer)) { | |
341 | put_net(net); | |
e314dbdc | 342 | return PTR_ERR(peer); |
81adee47 | 343 | } |
e314dbdc PE |
344 | |
345 | if (tbp[IFLA_ADDRESS] == NULL) | |
346 | random_ether_addr(peer->dev_addr); | |
347 | ||
348 | err = register_netdevice(peer); | |
81adee47 EB |
349 | put_net(net); |
350 | net = NULL; | |
e314dbdc PE |
351 | if (err < 0) |
352 | goto err_register_peer; | |
353 | ||
354 | netif_carrier_off(peer); | |
355 | ||
3729d502 PM |
356 | err = rtnl_configure_link(peer, ifmp); |
357 | if (err < 0) | |
358 | goto err_configure_peer; | |
359 | ||
e314dbdc PE |
360 | /* |
361 | * register dev last | |
362 | * | |
363 | * note, that since we've registered new device the dev's name | |
364 | * should be re-allocated | |
365 | */ | |
366 | ||
367 | if (tb[IFLA_ADDRESS] == NULL) | |
368 | random_ether_addr(dev->dev_addr); | |
369 | ||
6c8c4446 JP |
370 | if (tb[IFLA_IFNAME]) |
371 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
372 | else | |
373 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
374 | ||
375 | if (strchr(dev->name, '%')) { | |
376 | err = dev_alloc_name(dev, dev->name); | |
377 | if (err < 0) | |
378 | goto err_alloc_name; | |
379 | } | |
380 | ||
e314dbdc PE |
381 | err = register_netdevice(dev); |
382 | if (err < 0) | |
383 | goto err_register_dev; | |
384 | ||
385 | netif_carrier_off(dev); | |
386 | ||
387 | /* | |
388 | * tie the deviced together | |
389 | */ | |
390 | ||
391 | priv = netdev_priv(dev); | |
e314dbdc | 392 | priv->peer = peer; |
e314dbdc PE |
393 | |
394 | priv = netdev_priv(peer); | |
e314dbdc | 395 | priv->peer = dev; |
e314dbdc PE |
396 | return 0; |
397 | ||
398 | err_register_dev: | |
399 | /* nothing to do */ | |
6c8c4446 | 400 | err_alloc_name: |
3729d502 | 401 | err_configure_peer: |
e314dbdc PE |
402 | unregister_netdevice(peer); |
403 | return err; | |
404 | ||
405 | err_register_peer: | |
406 | free_netdev(peer); | |
407 | return err; | |
408 | } | |
409 | ||
23289a37 | 410 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
411 | { |
412 | struct veth_priv *priv; | |
413 | struct net_device *peer; | |
414 | ||
415 | priv = netdev_priv(dev); | |
416 | peer = priv->peer; | |
417 | ||
24540535 ED |
418 | unregister_netdevice_queue(dev, head); |
419 | unregister_netdevice_queue(peer, head); | |
e314dbdc PE |
420 | } |
421 | ||
422 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
423 | ||
424 | static struct rtnl_link_ops veth_link_ops = { | |
425 | .kind = DRV_NAME, | |
426 | .priv_size = sizeof(struct veth_priv), | |
427 | .setup = veth_setup, | |
428 | .validate = veth_validate, | |
429 | .newlink = veth_newlink, | |
430 | .dellink = veth_dellink, | |
431 | .policy = veth_policy, | |
432 | .maxtype = VETH_INFO_MAX, | |
433 | }; | |
434 | ||
435 | /* | |
436 | * init/fini | |
437 | */ | |
438 | ||
439 | static __init int veth_init(void) | |
440 | { | |
441 | return rtnl_link_register(&veth_link_ops); | |
442 | } | |
443 | ||
444 | static __exit void veth_exit(void) | |
445 | { | |
68365458 | 446 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
447 | } |
448 | ||
449 | module_init(veth_init); | |
450 | module_exit(veth_exit); | |
451 | ||
452 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
453 | MODULE_LICENSE("GPL v2"); | |
454 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |