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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/netdevice.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/ethtool.h> |
14 | #include <linux/etherdevice.h> |
15 | |
16 | #include <net/dst.h> |
17 | #include <net/xfrm.h> |
18 | #include <linux/veth.h> |
19 | |
20 | #define DRV_NAME "veth" |
21 | #define DRV_VERSION "1.0" |
22 | |
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 | |
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; |
33 | unsigned long rx_dropped; |
34 | }; |
35 | |
36 | struct veth_priv { |
37 | struct net_device *peer; |
38 | struct veth_net_stats __percpu *stats; |
39 | unsigned ip_summed; |
40 | }; |
41 | |
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 | |
83 | static int veth_get_sset_count(struct net_device *dev, int sset) |
84 | { |
85 | switch (sset) { |
86 | case ETH_SS_STATS: |
87 | return ARRAY_SIZE(ethtool_stats_keys); |
88 | default: |
89 | return -EOPNOTSUPP; |
90 | } |
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 | |
133 | static const struct ethtool_ops veth_ethtool_ops = { |
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, |
144 | .get_sset_count = veth_get_sset_count, |
145 | .get_ethtool_stats = veth_get_ethtool_stats, |
146 | }; |
147 | |
148 | /* |
149 | * xmit |
150 | */ |
151 | |
152 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
153 | { |
154 | struct net_device *rcv = NULL; |
155 | struct veth_priv *priv, *rcv_priv; |
156 | struct veth_net_stats *stats, *rcv_stats; |
157 | int length; |
158 | |
159 | priv = netdev_priv(dev); |
160 | rcv = priv->peer; |
161 | rcv_priv = netdev_priv(rcv); |
162 | |
163 | stats = this_cpu_ptr(priv->stats); |
164 | rcv_stats = this_cpu_ptr(rcv_priv->stats); |
165 | |
166 | if (!(rcv->flags & IFF_UP)) |
167 | goto tx_drop; |
168 | |
169 | if (dev->features & NETIF_F_NO_CSUM) |
170 | skb->ip_summed = rcv_priv->ip_summed; |
171 | |
172 | length = skb->len + ETH_HLEN; |
173 | if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS) |
174 | goto rx_drop; |
175 | |
176 | stats->tx_bytes += length; |
177 | stats->tx_packets++; |
178 | |
179 | rcv_stats->rx_bytes += length; |
180 | rcv_stats->rx_packets++; |
181 | |
182 | return NETDEV_TX_OK; |
183 | |
184 | tx_drop: |
185 | kfree_skb(skb); |
186 | stats->tx_dropped++; |
187 | return NETDEV_TX_OK; |
188 | |
189 | rx_drop: |
190 | rcv_stats->rx_dropped++; |
191 | return NETDEV_TX_OK; |
192 | } |
193 | |
194 | /* |
195 | * general routines |
196 | */ |
197 | |
198 | static struct net_device_stats *veth_get_stats(struct net_device *dev) |
199 | { |
200 | struct veth_priv *priv; |
201 | int cpu; |
202 | struct veth_net_stats *stats, total = {0}; |
203 | |
204 | priv = netdev_priv(dev); |
205 | |
206 | for_each_possible_cpu(cpu) { |
207 | stats = per_cpu_ptr(priv->stats, cpu); |
208 | |
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; |
215 | } |
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; |
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 | |
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 | |
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 | |
264 | static int veth_dev_init(struct net_device *dev) |
265 | { |
266 | struct veth_net_stats __percpu *stats; |
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 | |
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 | |
287 | static const struct net_device_ops veth_netdev_ops = { |
288 | .ndo_init = veth_dev_init, |
289 | .ndo_open = veth_open, |
290 | .ndo_stop = veth_close, |
291 | .ndo_start_xmit = veth_xmit, |
292 | .ndo_change_mtu = veth_change_mtu, |
293 | .ndo_get_stats = veth_get_stats, |
294 | .ndo_set_mac_address = eth_mac_addr, |
295 | }; |
296 | |
297 | static void veth_setup(struct net_device *dev) |
298 | { |
299 | ether_setup(dev); |
300 | |
301 | dev->netdev_ops = &veth_netdev_ops; |
302 | dev->ethtool_ops = &veth_ethtool_ops; |
303 | dev->features |= NETIF_F_LLTX; |
304 | dev->destructor = veth_dev_free; |
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 | } |
319 | if (tb[IFLA_MTU]) { |
320 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) |
321 | return -EINVAL; |
322 | } |
323 | return 0; |
324 | } |
325 | |
326 | static struct rtnl_link_ops veth_link_ops; |
327 | |
328 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
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; |
336 | struct ifinfomsg *ifmp; |
337 | struct net *net; |
338 | |
339 | /* |
340 | * create and register peer first |
341 | */ |
342 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
343 | struct nlattr *nla_peer; |
344 | |
345 | nla_peer = data[VETH_INFO_PEER]; |
346 | ifmp = nla_data(nla_peer); |
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; |
359 | } else { |
360 | ifmp = NULL; |
361 | tbp = tb; |
362 | } |
363 | |
364 | if (tbp[IFLA_IFNAME]) |
365 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
366 | else |
367 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
368 | |
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); |
376 | return PTR_ERR(peer); |
377 | } |
378 | |
379 | if (tbp[IFLA_ADDRESS] == NULL) |
380 | random_ether_addr(peer->dev_addr); |
381 | |
382 | err = register_netdevice(peer); |
383 | put_net(net); |
384 | net = NULL; |
385 | if (err < 0) |
386 | goto err_register_peer; |
387 | |
388 | netif_carrier_off(peer); |
389 | |
390 | err = rtnl_configure_link(peer, ifmp); |
391 | if (err < 0) |
392 | goto err_configure_peer; |
393 | |
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); |
426 | priv->peer = peer; |
427 | |
428 | priv = netdev_priv(peer); |
429 | priv->peer = dev; |
430 | return 0; |
431 | |
432 | err_register_dev: |
433 | /* nothing to do */ |
434 | err_alloc_name: |
435 | err_configure_peer: |
436 | unregister_netdevice(peer); |
437 | return err; |
438 | |
439 | err_register_peer: |
440 | free_netdev(peer); |
441 | return err; |
442 | } |
443 | |
444 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
445 | { |
446 | struct veth_priv *priv; |
447 | struct net_device *peer; |
448 | |
449 | priv = netdev_priv(dev); |
450 | peer = priv->peer; |
451 | |
452 | unregister_netdevice_queue(dev, head); |
453 | unregister_netdevice_queue(peer, head); |
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 | { |
480 | rtnl_link_unregister(&veth_link_ops); |
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); |
489 |
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