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rtlwifi: rtl8192ce: Remove address of Free Software Foundation
[linux-2.6/btrfs-unstable.git] / drivers / net / veth.c
blob0520952aa096efd4131526ae53cde4bf94786d42
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 #include <linux/u64_stats_sync.h>
16
17 #include <net/rtnetlink.h>
18 #include <net/dst.h>
19 #include <net/xfrm.h>
20 #include <linux/veth.h>
21 #include <linux/module.h>
22
23 #define DRV_NAME "veth"
24 #define DRV_VERSION "1.0"
25
26 struct pcpu_vstats {
27 u64 packets;
28 u64 bytes;
29 struct u64_stats_sync syncp;
30 };
31
32 struct veth_priv {
33 struct net_device __rcu *peer;
34 atomic64_t dropped;
35 unsigned requested_headroom;
36 };
37
38 /*
39 * ethtool interface
40 */
41
42 static struct {
43 const char string[ETH_GSTRING_LEN];
44 } ethtool_stats_keys[] = {
45 { "peer_ifindex" },
46 };
47
48 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
49 {
50 cmd->supported = 0;
51 cmd->advertising = 0;
52 ethtool_cmd_speed_set(cmd, SPEED_10000);
53 cmd->duplex = DUPLEX_FULL;
54 cmd->port = PORT_TP;
55 cmd->phy_address = 0;
56 cmd->transceiver = XCVR_INTERNAL;
57 cmd->autoneg = AUTONEG_DISABLE;
58 cmd->maxtxpkt = 0;
59 cmd->maxrxpkt = 0;
60 return 0;
61 }
62
63 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
64 {
65 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
66 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
67 }
68
69 static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
70 {
71 switch(stringset) {
72 case ETH_SS_STATS:
73 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
74 break;
75 }
76 }
77
78 static int veth_get_sset_count(struct net_device *dev, int sset)
79 {
80 switch (sset) {
81 case ETH_SS_STATS:
82 return ARRAY_SIZE(ethtool_stats_keys);
83 default:
84 return -EOPNOTSUPP;
85 }
86 }
87
88 static void veth_get_ethtool_stats(struct net_device *dev,
89 struct ethtool_stats *stats, u64 *data)
90 {
91 struct veth_priv *priv = netdev_priv(dev);
92 struct net_device *peer = rtnl_dereference(priv->peer);
93
94 data[0] = peer ? peer->ifindex : 0;
95 }
96
97 static const struct ethtool_ops veth_ethtool_ops = {
98 .get_settings = veth_get_settings,
99 .get_drvinfo = veth_get_drvinfo,
100 .get_link = ethtool_op_get_link,
101 .get_strings = veth_get_strings,
102 .get_sset_count = veth_get_sset_count,
103 .get_ethtool_stats = veth_get_ethtool_stats,
104 };
105
106 static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
107 {
108 struct veth_priv *priv = netdev_priv(dev);
109 struct net_device *rcv;
110 int length = skb->len;
111
112 rcu_read_lock();
113 rcv = rcu_dereference(priv->peer);
114 if (unlikely(!rcv)) {
115 kfree_skb(skb);
116 goto drop;
117 }
118
119 if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
120 struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
121
122 u64_stats_update_begin(&stats->syncp);
123 stats->bytes += length;
124 stats->packets++;
125 u64_stats_update_end(&stats->syncp);
126 } else {
127 drop:
128 atomic64_inc(&priv->dropped);
129 }
130 rcu_read_unlock();
131 return NETDEV_TX_OK;
132 }
133
134 /*
135 * general routines
136 */
137
138 static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
139 {
140 struct veth_priv *priv = netdev_priv(dev);
141 int cpu;
142
143 result->packets = 0;
144 result->bytes = 0;
145 for_each_possible_cpu(cpu) {
146 struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
147 u64 packets, bytes;
148 unsigned int start;
149
150 do {
151 start = u64_stats_fetch_begin_irq(&stats->syncp);
152 packets = stats->packets;
153 bytes = stats->bytes;
154 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
155 result->packets += packets;
156 result->bytes += bytes;
157 }
158 return atomic64_read(&priv->dropped);
159 }
160
161 static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
162 struct rtnl_link_stats64 *tot)
163 {
164 struct veth_priv *priv = netdev_priv(dev);
165 struct net_device *peer;
166 struct pcpu_vstats one;
167
168 tot->tx_dropped = veth_stats_one(&one, dev);
169 tot->tx_bytes = one.bytes;
170 tot->tx_packets = one.packets;
171
172 rcu_read_lock();
173 peer = rcu_dereference(priv->peer);
174 if (peer) {
175 tot->rx_dropped = veth_stats_one(&one, peer);
176 tot->rx_bytes = one.bytes;
177 tot->rx_packets = one.packets;
178 }
179 rcu_read_unlock();
180
181 return tot;
182 }
183
184 /* fake multicast ability */
185 static void veth_set_multicast_list(struct net_device *dev)
186 {
187 }
188
189 static int veth_open(struct net_device *dev)
190 {
191 struct veth_priv *priv = netdev_priv(dev);
192 struct net_device *peer = rtnl_dereference(priv->peer);
193
194 if (!peer)
195 return -ENOTCONN;
196
197 if (peer->flags & IFF_UP) {
198 netif_carrier_on(dev);
199 netif_carrier_on(peer);
200 }
201 return 0;
202 }
203
204 static int veth_close(struct net_device *dev)
205 {
206 struct veth_priv *priv = netdev_priv(dev);
207 struct net_device *peer = rtnl_dereference(priv->peer);
208
209 netif_carrier_off(dev);
210 if (peer)
211 netif_carrier_off(peer);
212
213 return 0;
214 }
215
216 static int is_valid_veth_mtu(int mtu)
217 {
218 return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
219 }
220
221 static int veth_dev_init(struct net_device *dev)
222 {
223 dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
224 if (!dev->vstats)
225 return -ENOMEM;
226 return 0;
227 }
228
229 static void veth_dev_free(struct net_device *dev)
230 {
231 free_percpu(dev->vstats);
232 free_netdev(dev);
233 }
234
235 #ifdef CONFIG_NET_POLL_CONTROLLER
236 static void veth_poll_controller(struct net_device *dev)
237 {
238 /* veth only receives frames when its peer sends one
239 * Since it's a synchronous operation, we are guaranteed
240 * never to have pending data when we poll for it so
241 * there is nothing to do here.
242 *
243 * We need this though so netpoll recognizes us as an interface that
244 * supports polling, which enables bridge devices in virt setups to
245 * still use netconsole
246 */
247 }
248 #endif /* CONFIG_NET_POLL_CONTROLLER */
249
250 static int veth_get_iflink(const struct net_device *dev)
251 {
252 struct veth_priv *priv = netdev_priv(dev);
253 struct net_device *peer;
254 int iflink;
255
256 rcu_read_lock();
257 peer = rcu_dereference(priv->peer);
258 iflink = peer ? peer->ifindex : 0;
259 rcu_read_unlock();
260
261 return iflink;
262 }
263
264 static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
265 {
266 struct veth_priv *peer_priv, *priv = netdev_priv(dev);
267 struct net_device *peer;
268
269 if (new_hr < 0)
270 new_hr = 0;
271
272 rcu_read_lock();
273 peer = rcu_dereference(priv->peer);
274 if (unlikely(!peer))
275 goto out;
276
277 peer_priv = netdev_priv(peer);
278 priv->requested_headroom = new_hr;
279 new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
280 dev->needed_headroom = new_hr;
281 peer->needed_headroom = new_hr;
282
283 out:
284 rcu_read_unlock();
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_get_stats64 = veth_get_stats64,
293 .ndo_set_rx_mode = veth_set_multicast_list,
294 .ndo_set_mac_address = eth_mac_addr,
295 #ifdef CONFIG_NET_POLL_CONTROLLER
296 .ndo_poll_controller = veth_poll_controller,
297 #endif
298 .ndo_get_iflink = veth_get_iflink,
299 .ndo_features_check = passthru_features_check,
300 .ndo_set_rx_headroom = veth_set_rx_headroom,
301 };
302
303 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
304 NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
305 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
306 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
307 NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
308
309 static void veth_setup(struct net_device *dev)
310 {
311 ether_setup(dev);
312
313 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
314 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
315 dev->priv_flags |= IFF_NO_QUEUE;
316 dev->priv_flags |= IFF_PHONY_HEADROOM;
317
318 dev->netdev_ops = &veth_netdev_ops;
319 dev->ethtool_ops = &veth_ethtool_ops;
320 dev->features |= NETIF_F_LLTX;
321 dev->features |= VETH_FEATURES;
322 dev->vlan_features = dev->features &
323 ~(NETIF_F_HW_VLAN_CTAG_TX |
324 NETIF_F_HW_VLAN_STAG_TX |
325 NETIF_F_HW_VLAN_CTAG_RX |
326 NETIF_F_HW_VLAN_STAG_RX);
327 dev->destructor = veth_dev_free;
328 dev->max_mtu = ETH_MAX_MTU;
329
330 dev->hw_features = VETH_FEATURES;
331 dev->hw_enc_features = VETH_FEATURES;
332 dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
333 }
334
335 /*
336 * netlink interface
337 */
338
339 static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
340 {
341 if (tb[IFLA_ADDRESS]) {
342 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
343 return -EINVAL;
344 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
345 return -EADDRNOTAVAIL;
346 }
347 if (tb[IFLA_MTU]) {
348 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
349 return -EINVAL;
350 }
351 return 0;
352 }
353
354 static struct rtnl_link_ops veth_link_ops;
355
356 static int veth_newlink(struct net *src_net, struct net_device *dev,
357 struct nlattr *tb[], struct nlattr *data[])
358 {
359 int err;
360 struct net_device *peer;
361 struct veth_priv *priv;
362 char ifname[IFNAMSIZ];
363 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
364 unsigned char name_assign_type;
365 struct ifinfomsg *ifmp;
366 struct net *net;
367
368 /*
369 * create and register peer first
370 */
371 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
372 struct nlattr *nla_peer;
373
374 nla_peer = data[VETH_INFO_PEER];
375 ifmp = nla_data(nla_peer);
376 err = rtnl_nla_parse_ifla(peer_tb,
377 nla_data(nla_peer) + sizeof(struct ifinfomsg),
378 nla_len(nla_peer) - sizeof(struct ifinfomsg));
379 if (err < 0)
380 return err;
381
382 err = veth_validate(peer_tb, NULL);
383 if (err < 0)
384 return err;
385
386 tbp = peer_tb;
387 } else {
388 ifmp = NULL;
389 tbp = tb;
390 }
391
392 if (tbp[IFLA_IFNAME]) {
393 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
394 name_assign_type = NET_NAME_USER;
395 } else {
396 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
397 name_assign_type = NET_NAME_ENUM;
398 }
399
400 net = rtnl_link_get_net(src_net, tbp);
401 if (IS_ERR(net))
402 return PTR_ERR(net);
403
404 peer = rtnl_create_link(net, ifname, name_assign_type,
405 &veth_link_ops, tbp);
406 if (IS_ERR(peer)) {
407 put_net(net);
408 return PTR_ERR(peer);
409 }
410
411 if (tbp[IFLA_ADDRESS] == NULL)
412 eth_hw_addr_random(peer);
413
414 if (ifmp && (dev->ifindex != 0))
415 peer->ifindex = ifmp->ifi_index;
416
417 err = register_netdevice(peer);
418 put_net(net);
419 net = NULL;
420 if (err < 0)
421 goto err_register_peer;
422
423 netif_carrier_off(peer);
424
425 err = rtnl_configure_link(peer, ifmp);
426 if (err < 0)
427 goto err_configure_peer;
428
429 /*
430 * register dev last
431 *
432 * note, that since we've registered new device the dev's name
433 * should be re-allocated
434 */
435
436 if (tb[IFLA_ADDRESS] == NULL)
437 eth_hw_addr_random(dev);
438
439 if (tb[IFLA_IFNAME])
440 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
441 else
442 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
443
444 err = register_netdevice(dev);
445 if (err < 0)
446 goto err_register_dev;
447
448 netif_carrier_off(dev);
449
450 /*
451 * tie the deviced together
452 */
453
454 priv = netdev_priv(dev);
455 rcu_assign_pointer(priv->peer, peer);
456
457 priv = netdev_priv(peer);
458 rcu_assign_pointer(priv->peer, dev);
459 return 0;
460
461 err_register_dev:
462 /* nothing to do */
463 err_configure_peer:
464 unregister_netdevice(peer);
465 return err;
466
467 err_register_peer:
468 free_netdev(peer);
469 return err;
470 }
471
472 static void veth_dellink(struct net_device *dev, struct list_head *head)
473 {
474 struct veth_priv *priv;
475 struct net_device *peer;
476
477 priv = netdev_priv(dev);
478 peer = rtnl_dereference(priv->peer);
479
480 /* Note : dellink() is called from default_device_exit_batch(),
481 * before a rcu_synchronize() point. The devices are guaranteed
482 * not being freed before one RCU grace period.
483 */
484 RCU_INIT_POINTER(priv->peer, NULL);
485 unregister_netdevice_queue(dev, head);
486
487 if (peer) {
488 priv = netdev_priv(peer);
489 RCU_INIT_POINTER(priv->peer, NULL);
490 unregister_netdevice_queue(peer, head);
491 }
492 }
493
494 static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
495 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
496 };
497
498 static struct net *veth_get_link_net(const struct net_device *dev)
499 {
500 struct veth_priv *priv = netdev_priv(dev);
501 struct net_device *peer = rtnl_dereference(priv->peer);
502
503 return peer ? dev_net(peer) : dev_net(dev);
504 }
505
506 static struct rtnl_link_ops veth_link_ops = {
507 .kind = DRV_NAME,
508 .priv_size = sizeof(struct veth_priv),
509 .setup = veth_setup,
510 .validate = veth_validate,
511 .newlink = veth_newlink,
512 .dellink = veth_dellink,
513 .policy = veth_policy,
514 .maxtype = VETH_INFO_MAX,
515 .get_link_net = veth_get_link_net,
516 };
517
518 /*
519 * init/fini
520 */
521
522 static __init int veth_init(void)
523 {
524 return rtnl_link_register(&veth_link_ops);
525 }
526
527 static __exit void veth_exit(void)
528 {
529 rtnl_link_unregister(&veth_link_ops);
530 }
531
532 module_init(veth_init);
533 module_exit(veth_exit);
534
535 MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
536 MODULE_LICENSE("GPL v2");
537 MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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