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> | |
cf05c700 | 15 | #include <linux/u64_stats_sync.h> |
e314dbdc PE |
16 | |
17 | #include <net/dst.h> | |
18 | #include <net/xfrm.h> | |
ecef969e | 19 | #include <linux/veth.h> |
9d9779e7 | 20 | #include <linux/module.h> |
e314dbdc PE |
21 | |
22 | #define DRV_NAME "veth" | |
23 | #define DRV_VERSION "1.0" | |
24 | ||
38d40815 EB |
25 | #define MIN_MTU 68 /* Min L3 MTU */ |
26 | #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */ | |
38d40815 | 27 | |
e314dbdc | 28 | struct veth_net_stats { |
cf05c700 ED |
29 | u64 rx_packets; |
30 | u64 tx_packets; | |
31 | u64 rx_bytes; | |
32 | u64 tx_bytes; | |
33 | u64 rx_dropped; | |
cf05c700 | 34 | struct u64_stats_sync syncp; |
e314dbdc PE |
35 | }; |
36 | ||
37 | struct veth_priv { | |
38 | struct net_device *peer; | |
47d74275 | 39 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
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; | |
70739497 | 56 | ethtool_cmd_speed_set(cmd, SPEED_10000); |
e314dbdc PE |
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 | ||
0fc0b732 | 102 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
103 | .get_settings = veth_get_settings, |
104 | .get_drvinfo = veth_get_drvinfo, | |
105 | .get_link = ethtool_op_get_link, | |
e314dbdc | 106 | .get_strings = veth_get_strings, |
b9f2c044 | 107 | .get_sset_count = veth_get_sset_count, |
e314dbdc PE |
108 | .get_ethtool_stats = veth_get_ethtool_stats, |
109 | }; | |
110 | ||
111 | /* | |
112 | * xmit | |
113 | */ | |
114 | ||
424efe9c | 115 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
e314dbdc PE |
116 | { |
117 | struct net_device *rcv = NULL; | |
118 | struct veth_priv *priv, *rcv_priv; | |
38d40815 | 119 | struct veth_net_stats *stats, *rcv_stats; |
e7dcaa47 | 120 | int length; |
e314dbdc | 121 | |
e314dbdc PE |
122 | priv = netdev_priv(dev); |
123 | rcv = priv->peer; | |
124 | rcv_priv = netdev_priv(rcv); | |
125 | ||
e7dcaa47 CL |
126 | stats = this_cpu_ptr(priv->stats); |
127 | rcv_stats = this_cpu_ptr(rcv_priv->stats); | |
e314dbdc | 128 | |
0b796750 MM |
129 | /* don't change ip_summed == CHECKSUM_PARTIAL, as that |
130 | will cause bad checksum on forwarded packets */ | |
a2c725fa MM |
131 | if (skb->ip_summed == CHECKSUM_NONE && |
132 | rcv->features & NETIF_F_RXCSUM) | |
133 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
e314dbdc | 134 | |
675071a2 | 135 | length = skb->len; |
44540960 AB |
136 | if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS) |
137 | goto rx_drop; | |
e314dbdc | 138 | |
cf05c700 | 139 | u64_stats_update_begin(&stats->syncp); |
e314dbdc PE |
140 | stats->tx_bytes += length; |
141 | stats->tx_packets++; | |
cf05c700 | 142 | u64_stats_update_end(&stats->syncp); |
e314dbdc | 143 | |
cf05c700 | 144 | u64_stats_update_begin(&rcv_stats->syncp); |
38d40815 EB |
145 | rcv_stats->rx_bytes += length; |
146 | rcv_stats->rx_packets++; | |
cf05c700 | 147 | u64_stats_update_end(&rcv_stats->syncp); |
e314dbdc | 148 | |
6ed10654 | 149 | return NETDEV_TX_OK; |
e314dbdc | 150 | |
38d40815 | 151 | rx_drop: |
cf05c700 | 152 | u64_stats_update_begin(&rcv_stats->syncp); |
38d40815 | 153 | rcv_stats->rx_dropped++; |
cf05c700 | 154 | u64_stats_update_end(&rcv_stats->syncp); |
6ed10654 | 155 | return NETDEV_TX_OK; |
e314dbdc PE |
156 | } |
157 | ||
158 | /* | |
159 | * general routines | |
160 | */ | |
161 | ||
6311cc44 | 162 | static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev, |
163 | struct rtnl_link_stats64 *tot) | |
e314dbdc | 164 | { |
cf05c700 | 165 | struct veth_priv *priv = netdev_priv(dev); |
11687a10 | 166 | int cpu; |
e314dbdc | 167 | |
2b1c8b0f | 168 | for_each_possible_cpu(cpu) { |
cf05c700 ED |
169 | struct veth_net_stats *stats = per_cpu_ptr(priv->stats, cpu); |
170 | u64 rx_packets, rx_bytes, rx_dropped; | |
81b16ba2 | 171 | u64 tx_packets, tx_bytes; |
cf05c700 ED |
172 | unsigned int start; |
173 | ||
174 | do { | |
175 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
176 | rx_packets = stats->rx_packets; | |
177 | tx_packets = stats->tx_packets; | |
178 | rx_bytes = stats->rx_bytes; | |
179 | tx_bytes = stats->tx_bytes; | |
180 | rx_dropped = stats->rx_dropped; | |
cf05c700 ED |
181 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); |
182 | tot->rx_packets += rx_packets; | |
183 | tot->tx_packets += tx_packets; | |
184 | tot->rx_bytes += rx_bytes; | |
185 | tot->tx_bytes += tx_bytes; | |
186 | tot->rx_dropped += rx_dropped; | |
11687a10 | 187 | } |
6311cc44 | 188 | |
189 | return tot; | |
e314dbdc PE |
190 | } |
191 | ||
192 | static int veth_open(struct net_device *dev) | |
193 | { | |
194 | struct veth_priv *priv; | |
195 | ||
196 | priv = netdev_priv(dev); | |
197 | if (priv->peer == NULL) | |
198 | return -ENOTCONN; | |
199 | ||
200 | if (priv->peer->flags & IFF_UP) { | |
201 | netif_carrier_on(dev); | |
202 | netif_carrier_on(priv->peer); | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
2cf48a10 EB |
207 | static int veth_close(struct net_device *dev) |
208 | { | |
209 | struct veth_priv *priv = netdev_priv(dev); | |
210 | ||
211 | netif_carrier_off(dev); | |
212 | netif_carrier_off(priv->peer); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
38d40815 EB |
217 | static int is_valid_veth_mtu(int new_mtu) |
218 | { | |
807540ba | 219 | return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU; |
38d40815 EB |
220 | } |
221 | ||
222 | static int veth_change_mtu(struct net_device *dev, int new_mtu) | |
223 | { | |
224 | if (!is_valid_veth_mtu(new_mtu)) | |
225 | return -EINVAL; | |
226 | dev->mtu = new_mtu; | |
227 | return 0; | |
228 | } | |
229 | ||
e314dbdc PE |
230 | static int veth_dev_init(struct net_device *dev) |
231 | { | |
47d74275 | 232 | struct veth_net_stats __percpu *stats; |
e314dbdc PE |
233 | struct veth_priv *priv; |
234 | ||
235 | stats = alloc_percpu(struct veth_net_stats); | |
236 | if (stats == NULL) | |
237 | return -ENOMEM; | |
238 | ||
239 | priv = netdev_priv(dev); | |
240 | priv->stats = stats; | |
241 | return 0; | |
242 | } | |
243 | ||
11687a10 DM |
244 | static void veth_dev_free(struct net_device *dev) |
245 | { | |
246 | struct veth_priv *priv; | |
247 | ||
248 | priv = netdev_priv(dev); | |
249 | free_percpu(priv->stats); | |
250 | free_netdev(dev); | |
251 | } | |
252 | ||
4456e7bd | 253 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
254 | .ndo_init = veth_dev_init, |
255 | .ndo_open = veth_open, | |
2cf48a10 | 256 | .ndo_stop = veth_close, |
ee923623 | 257 | .ndo_start_xmit = veth_xmit, |
38d40815 | 258 | .ndo_change_mtu = veth_change_mtu, |
6311cc44 | 259 | .ndo_get_stats64 = veth_get_stats64, |
ee923623 | 260 | .ndo_set_mac_address = eth_mac_addr, |
4456e7bd SH |
261 | }; |
262 | ||
e314dbdc PE |
263 | static void veth_setup(struct net_device *dev) |
264 | { | |
265 | ether_setup(dev); | |
266 | ||
550fd08c NH |
267 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
268 | ||
4456e7bd | 269 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
270 | dev->ethtool_ops = &veth_ethtool_ops; |
271 | dev->features |= NETIF_F_LLTX; | |
11687a10 | 272 | dev->destructor = veth_dev_free; |
a2c725fa MM |
273 | |
274 | dev->hw_features = NETIF_F_NO_CSUM | NETIF_F_SG | NETIF_F_RXCSUM; | |
e314dbdc PE |
275 | } |
276 | ||
277 | /* | |
278 | * netlink interface | |
279 | */ | |
280 | ||
281 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) | |
282 | { | |
283 | if (tb[IFLA_ADDRESS]) { | |
284 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
285 | return -EINVAL; | |
286 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
287 | return -EADDRNOTAVAIL; | |
288 | } | |
38d40815 EB |
289 | if (tb[IFLA_MTU]) { |
290 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
291 | return -EINVAL; | |
292 | } | |
e314dbdc PE |
293 | return 0; |
294 | } | |
295 | ||
296 | static struct rtnl_link_ops veth_link_ops; | |
297 | ||
81adee47 | 298 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
e314dbdc PE |
299 | struct nlattr *tb[], struct nlattr *data[]) |
300 | { | |
301 | int err; | |
302 | struct net_device *peer; | |
303 | struct veth_priv *priv; | |
304 | char ifname[IFNAMSIZ]; | |
305 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
3729d502 | 306 | struct ifinfomsg *ifmp; |
81adee47 | 307 | struct net *net; |
e314dbdc PE |
308 | |
309 | /* | |
310 | * create and register peer first | |
e314dbdc | 311 | */ |
e314dbdc PE |
312 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
313 | struct nlattr *nla_peer; | |
314 | ||
315 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 316 | ifmp = nla_data(nla_peer); |
e314dbdc PE |
317 | err = nla_parse(peer_tb, IFLA_MAX, |
318 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
319 | nla_len(nla_peer) - sizeof(struct ifinfomsg), | |
320 | ifla_policy); | |
321 | if (err < 0) | |
322 | return err; | |
323 | ||
324 | err = veth_validate(peer_tb, NULL); | |
325 | if (err < 0) | |
326 | return err; | |
327 | ||
328 | tbp = peer_tb; | |
3729d502 PM |
329 | } else { |
330 | ifmp = NULL; | |
e314dbdc | 331 | tbp = tb; |
3729d502 | 332 | } |
e314dbdc PE |
333 | |
334 | if (tbp[IFLA_IFNAME]) | |
335 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); | |
336 | else | |
337 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); | |
338 | ||
81adee47 EB |
339 | net = rtnl_link_get_net(src_net, tbp); |
340 | if (IS_ERR(net)) | |
341 | return PTR_ERR(net); | |
342 | ||
343 | peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); | |
344 | if (IS_ERR(peer)) { | |
345 | put_net(net); | |
e314dbdc | 346 | return PTR_ERR(peer); |
81adee47 | 347 | } |
e314dbdc PE |
348 | |
349 | if (tbp[IFLA_ADDRESS] == NULL) | |
350 | random_ether_addr(peer->dev_addr); | |
351 | ||
352 | err = register_netdevice(peer); | |
81adee47 EB |
353 | put_net(net); |
354 | net = NULL; | |
e314dbdc PE |
355 | if (err < 0) |
356 | goto err_register_peer; | |
357 | ||
358 | netif_carrier_off(peer); | |
359 | ||
3729d502 PM |
360 | err = rtnl_configure_link(peer, ifmp); |
361 | if (err < 0) | |
362 | goto err_configure_peer; | |
363 | ||
e314dbdc PE |
364 | /* |
365 | * register dev last | |
366 | * | |
367 | * note, that since we've registered new device the dev's name | |
368 | * should be re-allocated | |
369 | */ | |
370 | ||
371 | if (tb[IFLA_ADDRESS] == NULL) | |
372 | random_ether_addr(dev->dev_addr); | |
373 | ||
6c8c4446 JP |
374 | if (tb[IFLA_IFNAME]) |
375 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
376 | else | |
377 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
378 | ||
379 | if (strchr(dev->name, '%')) { | |
380 | err = dev_alloc_name(dev, dev->name); | |
381 | if (err < 0) | |
382 | goto err_alloc_name; | |
383 | } | |
384 | ||
e314dbdc PE |
385 | err = register_netdevice(dev); |
386 | if (err < 0) | |
387 | goto err_register_dev; | |
388 | ||
389 | netif_carrier_off(dev); | |
390 | ||
391 | /* | |
392 | * tie the deviced together | |
393 | */ | |
394 | ||
395 | priv = netdev_priv(dev); | |
e314dbdc | 396 | priv->peer = peer; |
e314dbdc PE |
397 | |
398 | priv = netdev_priv(peer); | |
e314dbdc | 399 | priv->peer = dev; |
e314dbdc PE |
400 | return 0; |
401 | ||
402 | err_register_dev: | |
403 | /* nothing to do */ | |
6c8c4446 | 404 | err_alloc_name: |
3729d502 | 405 | err_configure_peer: |
e314dbdc PE |
406 | unregister_netdevice(peer); |
407 | return err; | |
408 | ||
409 | err_register_peer: | |
410 | free_netdev(peer); | |
411 | return err; | |
412 | } | |
413 | ||
23289a37 | 414 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
415 | { |
416 | struct veth_priv *priv; | |
417 | struct net_device *peer; | |
418 | ||
419 | priv = netdev_priv(dev); | |
420 | peer = priv->peer; | |
421 | ||
24540535 ED |
422 | unregister_netdevice_queue(dev, head); |
423 | unregister_netdevice_queue(peer, head); | |
e314dbdc PE |
424 | } |
425 | ||
426 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; | |
427 | ||
428 | static struct rtnl_link_ops veth_link_ops = { | |
429 | .kind = DRV_NAME, | |
430 | .priv_size = sizeof(struct veth_priv), | |
431 | .setup = veth_setup, | |
432 | .validate = veth_validate, | |
433 | .newlink = veth_newlink, | |
434 | .dellink = veth_dellink, | |
435 | .policy = veth_policy, | |
436 | .maxtype = VETH_INFO_MAX, | |
437 | }; | |
438 | ||
439 | /* | |
440 | * init/fini | |
441 | */ | |
442 | ||
443 | static __init int veth_init(void) | |
444 | { | |
445 | return rtnl_link_register(&veth_link_ops); | |
446 | } | |
447 | ||
448 | static __exit void veth_exit(void) | |
449 | { | |
68365458 | 450 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
451 | } |
452 | ||
453 | module_init(veth_init); | |
454 | module_exit(veth_exit); | |
455 | ||
456 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
457 | MODULE_LICENSE("GPL v2"); | |
458 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |