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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#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#define MIN_MTU 68 /* Min L3 MTU */
27#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
28
29struct pcpu_vstats {
30 u64 packets;
31 u64 bytes;
32 struct u64_stats_sync syncp;
33};
34
35struct veth_priv {
36 struct net_device __rcu *peer;
37 atomic64_t dropped;
38};
39
40/*
41 * ethtool interface
42 */
43
44static struct {
45 const char string[ETH_GSTRING_LEN];
46} ethtool_stats_keys[] = {
47 { "peer_ifindex" },
48};
49
50static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
51{
52 cmd->supported = 0;
53 cmd->advertising = 0;
54 ethtool_cmd_speed_set(cmd, SPEED_10000);
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
65static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
66{
67 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
68 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
69}
70
71static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
72{
73 switch(stringset) {
74 case ETH_SS_STATS:
75 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
76 break;
77 }
78}
79
80static int veth_get_sset_count(struct net_device *dev, int sset)
81{
82 switch (sset) {
83 case ETH_SS_STATS:
84 return ARRAY_SIZE(ethtool_stats_keys);
85 default:
86 return -EOPNOTSUPP;
87 }
88}
89
90static void veth_get_ethtool_stats(struct net_device *dev,
91 struct ethtool_stats *stats, u64 *data)
92{
93 struct veth_priv *priv = netdev_priv(dev);
94 struct net_device *peer = rtnl_dereference(priv->peer);
95
96 data[0] = peer ? peer->ifindex : 0;
97}
98
99static const struct ethtool_ops veth_ethtool_ops = {
100 .get_settings = veth_get_settings,
101 .get_drvinfo = veth_get_drvinfo,
102 .get_link = ethtool_op_get_link,
103 .get_strings = veth_get_strings,
104 .get_sset_count = veth_get_sset_count,
105 .get_ethtool_stats = veth_get_ethtool_stats,
106};
107
108static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
109{
110 struct veth_priv *priv = netdev_priv(dev);
111 struct net_device *rcv;
112 int length = skb->len;
113
114 rcu_read_lock();
115 rcv = rcu_dereference(priv->peer);
116 if (unlikely(!rcv)) {
117 kfree_skb(skb);
118 goto drop;
119 }
120 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
121 * will cause bad checksum on forwarded packets
122 */
123 if (skb->ip_summed == CHECKSUM_NONE &&
124 rcv->features & NETIF_F_RXCSUM)
125 skb->ip_summed = CHECKSUM_UNNECESSARY;
126
127 if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
128 struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
129
130 u64_stats_update_begin(&stats->syncp);
131 stats->bytes += length;
132 stats->packets++;
133 u64_stats_update_end(&stats->syncp);
134 } else {
135drop:
136 atomic64_inc(&priv->dropped);
137 }
138 rcu_read_unlock();
139 return NETDEV_TX_OK;
140}
141
142/*
143 * general routines
144 */
145
146static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
147{
148 struct veth_priv *priv = netdev_priv(dev);
149 int cpu;
150
151 result->packets = 0;
152 result->bytes = 0;
153 for_each_possible_cpu(cpu) {
154 struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
155 u64 packets, bytes;
156 unsigned int start;
157
158 do {
159 start = u64_stats_fetch_begin_irq(&stats->syncp);
160 packets = stats->packets;
161 bytes = stats->bytes;
162 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
163 result->packets += packets;
164 result->bytes += bytes;
165 }
166 return atomic64_read(&priv->dropped);
167}
168
169static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
170 struct rtnl_link_stats64 *tot)
171{
172 struct veth_priv *priv = netdev_priv(dev);
173 struct net_device *peer;
174 struct pcpu_vstats one;
175
176 tot->tx_dropped = veth_stats_one(&one, dev);
177 tot->tx_bytes = one.bytes;
178 tot->tx_packets = one.packets;
179
180 rcu_read_lock();
181 peer = rcu_dereference(priv->peer);
182 if (peer) {
183 tot->rx_dropped = veth_stats_one(&one, peer);
184 tot->rx_bytes = one.bytes;
185 tot->rx_packets = one.packets;
186 }
187 rcu_read_unlock();
188
189 return tot;
190}
191
192/* fake multicast ability */
193static void veth_set_multicast_list(struct net_device *dev)
194{
195}
196
197static int veth_open(struct net_device *dev)
198{
199 struct veth_priv *priv = netdev_priv(dev);
200 struct net_device *peer = rtnl_dereference(priv->peer);
201
202 if (!peer)
203 return -ENOTCONN;
204
205 if (peer->flags & IFF_UP) {
206 netif_carrier_on(dev);
207 netif_carrier_on(peer);
208 }
209 return 0;
210}
211
212static int veth_close(struct net_device *dev)
213{
214 struct veth_priv *priv = netdev_priv(dev);
215 struct net_device *peer = rtnl_dereference(priv->peer);
216
217 netif_carrier_off(dev);
218 if (peer)
219 netif_carrier_off(peer);
220
221 return 0;
222}
223
224static int is_valid_veth_mtu(int new_mtu)
225{
226 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
227}
228
229static int veth_change_mtu(struct net_device *dev, int new_mtu)
230{
231 if (!is_valid_veth_mtu(new_mtu))
232 return -EINVAL;
233 dev->mtu = new_mtu;
234 return 0;
235}
236
237static int veth_dev_init(struct net_device *dev)
238{
239 dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
240 if (!dev->vstats)
241 return -ENOMEM;
242 return 0;
243}
244
245static void veth_dev_free(struct net_device *dev)
246{
247 free_percpu(dev->vstats);
248 free_netdev(dev);
249}
250
251static const struct net_device_ops veth_netdev_ops = {
252 .ndo_init = veth_dev_init,
253 .ndo_open = veth_open,
254 .ndo_stop = veth_close,
255 .ndo_start_xmit = veth_xmit,
256 .ndo_change_mtu = veth_change_mtu,
257 .ndo_get_stats64 = veth_get_stats64,
258 .ndo_set_rx_mode = veth_set_multicast_list,
259 .ndo_set_mac_address = eth_mac_addr,
260};
261
262#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
263 NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
264 NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL | \
265 NETIF_F_GSO_IPIP | NETIF_F_GSO_SIT | NETIF_F_UFO | \
266 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
267 NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
268
269static void veth_setup(struct net_device *dev)
270{
271 ether_setup(dev);
272
273 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
274 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
275
276 dev->netdev_ops = &veth_netdev_ops;
277 dev->ethtool_ops = &veth_ethtool_ops;
278 dev->features |= NETIF_F_LLTX;
279 dev->features |= VETH_FEATURES;
280 dev->vlan_features = dev->features &
281 ~(NETIF_F_HW_VLAN_CTAG_TX |
282 NETIF_F_HW_VLAN_STAG_TX |
283 NETIF_F_HW_VLAN_CTAG_RX |
284 NETIF_F_HW_VLAN_STAG_RX);
285 dev->destructor = veth_dev_free;
286
287 dev->hw_features = VETH_FEATURES;
288 dev->hw_enc_features = VETH_FEATURES;
289}
290
291/*
292 * netlink interface
293 */
294
295static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
296{
297 if (tb[IFLA_ADDRESS]) {
298 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
299 return -EINVAL;
300 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
301 return -EADDRNOTAVAIL;
302 }
303 if (tb[IFLA_MTU]) {
304 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
305 return -EINVAL;
306 }
307 return 0;
308}
309
310static struct rtnl_link_ops veth_link_ops;
311
312static int veth_newlink(struct net *src_net, struct net_device *dev,
313 struct nlattr *tb[], struct nlattr *data[])
314{
315 int err;
316 struct net_device *peer;
317 struct veth_priv *priv;
318 char ifname[IFNAMSIZ];
319 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
320 struct ifinfomsg *ifmp;
321 struct net *net;
322
323 /*
324 * create and register peer first
325 */
326 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
327 struct nlattr *nla_peer;
328
329 nla_peer = data[VETH_INFO_PEER];
330 ifmp = nla_data(nla_peer);
331 err = rtnl_nla_parse_ifla(peer_tb,
332 nla_data(nla_peer) + sizeof(struct ifinfomsg),
333 nla_len(nla_peer) - sizeof(struct ifinfomsg));
334 if (err < 0)
335 return err;
336
337 err = veth_validate(peer_tb, NULL);
338 if (err < 0)
339 return err;
340
341 tbp = peer_tb;
342 } else {
343 ifmp = NULL;
344 tbp = tb;
345 }
346
347 if (tbp[IFLA_IFNAME])
348 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
349 else
350 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
351
352 net = rtnl_link_get_net(src_net, tbp);
353 if (IS_ERR(net))
354 return PTR_ERR(net);
355
356 peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp);
357 if (IS_ERR(peer)) {
358 put_net(net);
359 return PTR_ERR(peer);
360 }
361
362 if (tbp[IFLA_ADDRESS] == NULL)
363 eth_hw_addr_random(peer);
364
365 if (ifmp && (dev->ifindex != 0))
366 peer->ifindex = ifmp->ifi_index;
367
368 err = register_netdevice(peer);
369 put_net(net);
370 net = NULL;
371 if (err < 0)
372 goto err_register_peer;
373
374 netif_carrier_off(peer);
375
376 err = rtnl_configure_link(peer, ifmp);
377 if (err < 0)
378 goto err_configure_peer;
379
380 /*
381 * register dev last
382 *
383 * note, that since we've registered new device the dev's name
384 * should be re-allocated
385 */
386
387 if (tb[IFLA_ADDRESS] == NULL)
388 eth_hw_addr_random(dev);
389
390 if (tb[IFLA_IFNAME])
391 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
392 else
393 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
394
395 err = register_netdevice(dev);
396 if (err < 0)
397 goto err_register_dev;
398
399 netif_carrier_off(dev);
400
401 /*
402 * tie the deviced together
403 */
404
405 priv = netdev_priv(dev);
406 rcu_assign_pointer(priv->peer, peer);
407
408 priv = netdev_priv(peer);
409 rcu_assign_pointer(priv->peer, dev);
410 return 0;
411
412err_register_dev:
413 /* nothing to do */
414err_configure_peer:
415 unregister_netdevice(peer);
416 return err;
417
418err_register_peer:
419 free_netdev(peer);
420 return err;
421}
422
423static void veth_dellink(struct net_device *dev, struct list_head *head)
424{
425 struct veth_priv *priv;
426 struct net_device *peer;
427
428 priv = netdev_priv(dev);
429 peer = rtnl_dereference(priv->peer);
430
431 /* Note : dellink() is called from default_device_exit_batch(),
432 * before a rcu_synchronize() point. The devices are guaranteed
433 * not being freed before one RCU grace period.
434 */
435 RCU_INIT_POINTER(priv->peer, NULL);
436 unregister_netdevice_queue(dev, head);
437
438 if (peer) {
439 priv = netdev_priv(peer);
440 RCU_INIT_POINTER(priv->peer, NULL);
441 unregister_netdevice_queue(peer, head);
442 }
443}
444
445static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
446 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
447};
448
449static struct rtnl_link_ops veth_link_ops = {
450 .kind = DRV_NAME,
451 .priv_size = sizeof(struct veth_priv),
452 .setup = veth_setup,
453 .validate = veth_validate,
454 .newlink = veth_newlink,
455 .dellink = veth_dellink,
456 .policy = veth_policy,
457 .maxtype = VETH_INFO_MAX,
458};
459
460/*
461 * init/fini
462 */
463
464static __init int veth_init(void)
465{
466 return rtnl_link_register(&veth_link_ops);
467}
468
469static __exit void veth_exit(void)
470{
471 rtnl_link_unregister(&veth_link_ops);
472}
473
474module_init(veth_init);
475module_exit(veth_exit);
476
477MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
478MODULE_LICENSE("GPL v2");
479MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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#define MIN_MTU 68 /* Min L3 MTU */
27#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
28
29struct pcpu_vstats {
30 u64 packets;
31 u64 bytes;
32 struct u64_stats_sync syncp;
33};
34
35struct veth_priv {
36 struct net_device __rcu *peer;
37 atomic64_t dropped;
38 unsigned requested_headroom;
39};
40
41/*
42 * ethtool interface
43 */
44
45static struct {
46 const char string[ETH_GSTRING_LEN];
47} ethtool_stats_keys[] = {
48 { "peer_ifindex" },
49};
50
51static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
52{
53 cmd->supported = 0;
54 cmd->advertising = 0;
55 ethtool_cmd_speed_set(cmd, SPEED_10000);
56 cmd->duplex = DUPLEX_FULL;
57 cmd->port = PORT_TP;
58 cmd->phy_address = 0;
59 cmd->transceiver = XCVR_INTERNAL;
60 cmd->autoneg = AUTONEG_DISABLE;
61 cmd->maxtxpkt = 0;
62 cmd->maxrxpkt = 0;
63 return 0;
64}
65
66static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
67{
68 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
69 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
70}
71
72static 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
81static int veth_get_sset_count(struct net_device *dev, int sset)
82{
83 switch (sset) {
84 case ETH_SS_STATS:
85 return ARRAY_SIZE(ethtool_stats_keys);
86 default:
87 return -EOPNOTSUPP;
88 }
89}
90
91static void veth_get_ethtool_stats(struct net_device *dev,
92 struct ethtool_stats *stats, u64 *data)
93{
94 struct veth_priv *priv = netdev_priv(dev);
95 struct net_device *peer = rtnl_dereference(priv->peer);
96
97 data[0] = peer ? peer->ifindex : 0;
98}
99
100static const struct ethtool_ops veth_ethtool_ops = {
101 .get_settings = veth_get_settings,
102 .get_drvinfo = veth_get_drvinfo,
103 .get_link = ethtool_op_get_link,
104 .get_strings = veth_get_strings,
105 .get_sset_count = veth_get_sset_count,
106 .get_ethtool_stats = veth_get_ethtool_stats,
107};
108
109static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
110{
111 struct veth_priv *priv = netdev_priv(dev);
112 struct net_device *rcv;
113 int length = skb->len;
114
115 rcu_read_lock();
116 rcv = rcu_dereference(priv->peer);
117 if (unlikely(!rcv)) {
118 kfree_skb(skb);
119 goto drop;
120 }
121
122 if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
123 struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
124
125 u64_stats_update_begin(&stats->syncp);
126 stats->bytes += length;
127 stats->packets++;
128 u64_stats_update_end(&stats->syncp);
129 } else {
130drop:
131 atomic64_inc(&priv->dropped);
132 }
133 rcu_read_unlock();
134 return NETDEV_TX_OK;
135}
136
137/*
138 * general routines
139 */
140
141static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
142{
143 struct veth_priv *priv = netdev_priv(dev);
144 int cpu;
145
146 result->packets = 0;
147 result->bytes = 0;
148 for_each_possible_cpu(cpu) {
149 struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
150 u64 packets, bytes;
151 unsigned int start;
152
153 do {
154 start = u64_stats_fetch_begin_irq(&stats->syncp);
155 packets = stats->packets;
156 bytes = stats->bytes;
157 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
158 result->packets += packets;
159 result->bytes += bytes;
160 }
161 return atomic64_read(&priv->dropped);
162}
163
164static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
165 struct rtnl_link_stats64 *tot)
166{
167 struct veth_priv *priv = netdev_priv(dev);
168 struct net_device *peer;
169 struct pcpu_vstats one;
170
171 tot->tx_dropped = veth_stats_one(&one, dev);
172 tot->tx_bytes = one.bytes;
173 tot->tx_packets = one.packets;
174
175 rcu_read_lock();
176 peer = rcu_dereference(priv->peer);
177 if (peer) {
178 tot->rx_dropped = veth_stats_one(&one, peer);
179 tot->rx_bytes = one.bytes;
180 tot->rx_packets = one.packets;
181 }
182 rcu_read_unlock();
183
184 return tot;
185}
186
187/* fake multicast ability */
188static void veth_set_multicast_list(struct net_device *dev)
189{
190}
191
192static int veth_open(struct net_device *dev)
193{
194 struct veth_priv *priv = netdev_priv(dev);
195 struct net_device *peer = rtnl_dereference(priv->peer);
196
197 if (!peer)
198 return -ENOTCONN;
199
200 if (peer->flags & IFF_UP) {
201 netif_carrier_on(dev);
202 netif_carrier_on(peer);
203 }
204 return 0;
205}
206
207static int veth_close(struct net_device *dev)
208{
209 struct veth_priv *priv = netdev_priv(dev);
210 struct net_device *peer = rtnl_dereference(priv->peer);
211
212 netif_carrier_off(dev);
213 if (peer)
214 netif_carrier_off(peer);
215
216 return 0;
217}
218
219static int is_valid_veth_mtu(int new_mtu)
220{
221 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
222}
223
224static int veth_change_mtu(struct net_device *dev, int new_mtu)
225{
226 if (!is_valid_veth_mtu(new_mtu))
227 return -EINVAL;
228 dev->mtu = new_mtu;
229 return 0;
230}
231
232static int veth_dev_init(struct net_device *dev)
233{
234 dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
235 if (!dev->vstats)
236 return -ENOMEM;
237 return 0;
238}
239
240static void veth_dev_free(struct net_device *dev)
241{
242 free_percpu(dev->vstats);
243 free_netdev(dev);
244}
245
246#ifdef CONFIG_NET_POLL_CONTROLLER
247static void veth_poll_controller(struct net_device *dev)
248{
249 /* veth only receives frames when its peer sends one
250 * Since it's a synchronous operation, we are guaranteed
251 * never to have pending data when we poll for it so
252 * there is nothing to do here.
253 *
254 * We need this though so netpoll recognizes us as an interface that
255 * supports polling, which enables bridge devices in virt setups to
256 * still use netconsole
257 */
258}
259#endif /* CONFIG_NET_POLL_CONTROLLER */
260
261static int veth_get_iflink(const struct net_device *dev)
262{
263 struct veth_priv *priv = netdev_priv(dev);
264 struct net_device *peer;
265 int iflink;
266
267 rcu_read_lock();
268 peer = rcu_dereference(priv->peer);
269 iflink = peer ? peer->ifindex : 0;
270 rcu_read_unlock();
271
272 return iflink;
273}
274
275static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
276{
277 struct veth_priv *peer_priv, *priv = netdev_priv(dev);
278 struct net_device *peer;
279
280 if (new_hr < 0)
281 new_hr = 0;
282
283 rcu_read_lock();
284 peer = rcu_dereference(priv->peer);
285 if (unlikely(!peer))
286 goto out;
287
288 peer_priv = netdev_priv(peer);
289 priv->requested_headroom = new_hr;
290 new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
291 dev->needed_headroom = new_hr;
292 peer->needed_headroom = new_hr;
293
294out:
295 rcu_read_unlock();
296}
297
298static const struct net_device_ops veth_netdev_ops = {
299 .ndo_init = veth_dev_init,
300 .ndo_open = veth_open,
301 .ndo_stop = veth_close,
302 .ndo_start_xmit = veth_xmit,
303 .ndo_change_mtu = veth_change_mtu,
304 .ndo_get_stats64 = veth_get_stats64,
305 .ndo_set_rx_mode = veth_set_multicast_list,
306 .ndo_set_mac_address = eth_mac_addr,
307#ifdef CONFIG_NET_POLL_CONTROLLER
308 .ndo_poll_controller = veth_poll_controller,
309#endif
310 .ndo_get_iflink = veth_get_iflink,
311 .ndo_features_check = passthru_features_check,
312 .ndo_set_rx_headroom = veth_set_rx_headroom,
313};
314
315#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
316 NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
317 NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL | \
318 NETIF_F_GSO_IPIP | NETIF_F_GSO_SIT | NETIF_F_UFO | \
319 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
320 NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
321
322static void veth_setup(struct net_device *dev)
323{
324 ether_setup(dev);
325
326 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
327 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
328 dev->priv_flags |= IFF_NO_QUEUE;
329 dev->priv_flags |= IFF_PHONY_HEADROOM;
330
331 dev->netdev_ops = &veth_netdev_ops;
332 dev->ethtool_ops = &veth_ethtool_ops;
333 dev->features |= NETIF_F_LLTX;
334 dev->features |= VETH_FEATURES;
335 dev->vlan_features = dev->features &
336 ~(NETIF_F_HW_VLAN_CTAG_TX |
337 NETIF_F_HW_VLAN_STAG_TX |
338 NETIF_F_HW_VLAN_CTAG_RX |
339 NETIF_F_HW_VLAN_STAG_RX);
340 dev->destructor = veth_dev_free;
341
342 dev->hw_features = VETH_FEATURES;
343 dev->hw_enc_features = VETH_FEATURES;
344}
345
346/*
347 * netlink interface
348 */
349
350static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
351{
352 if (tb[IFLA_ADDRESS]) {
353 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
354 return -EINVAL;
355 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
356 return -EADDRNOTAVAIL;
357 }
358 if (tb[IFLA_MTU]) {
359 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
360 return -EINVAL;
361 }
362 return 0;
363}
364
365static struct rtnl_link_ops veth_link_ops;
366
367static int veth_newlink(struct net *src_net, struct net_device *dev,
368 struct nlattr *tb[], struct nlattr *data[])
369{
370 int err;
371 struct net_device *peer;
372 struct veth_priv *priv;
373 char ifname[IFNAMSIZ];
374 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
375 unsigned char name_assign_type;
376 struct ifinfomsg *ifmp;
377 struct net *net;
378
379 /*
380 * create and register peer first
381 */
382 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
383 struct nlattr *nla_peer;
384
385 nla_peer = data[VETH_INFO_PEER];
386 ifmp = nla_data(nla_peer);
387 err = rtnl_nla_parse_ifla(peer_tb,
388 nla_data(nla_peer) + sizeof(struct ifinfomsg),
389 nla_len(nla_peer) - sizeof(struct ifinfomsg));
390 if (err < 0)
391 return err;
392
393 err = veth_validate(peer_tb, NULL);
394 if (err < 0)
395 return err;
396
397 tbp = peer_tb;
398 } else {
399 ifmp = NULL;
400 tbp = tb;
401 }
402
403 if (tbp[IFLA_IFNAME]) {
404 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
405 name_assign_type = NET_NAME_USER;
406 } else {
407 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
408 name_assign_type = NET_NAME_ENUM;
409 }
410
411 net = rtnl_link_get_net(src_net, tbp);
412 if (IS_ERR(net))
413 return PTR_ERR(net);
414
415 peer = rtnl_create_link(net, ifname, name_assign_type,
416 &veth_link_ops, tbp);
417 if (IS_ERR(peer)) {
418 put_net(net);
419 return PTR_ERR(peer);
420 }
421
422 if (tbp[IFLA_ADDRESS] == NULL)
423 eth_hw_addr_random(peer);
424
425 if (ifmp && (dev->ifindex != 0))
426 peer->ifindex = ifmp->ifi_index;
427
428 err = register_netdevice(peer);
429 put_net(net);
430 net = NULL;
431 if (err < 0)
432 goto err_register_peer;
433
434 netif_carrier_off(peer);
435
436 err = rtnl_configure_link(peer, ifmp);
437 if (err < 0)
438 goto err_configure_peer;
439
440 /*
441 * register dev last
442 *
443 * note, that since we've registered new device the dev's name
444 * should be re-allocated
445 */
446
447 if (tb[IFLA_ADDRESS] == NULL)
448 eth_hw_addr_random(dev);
449
450 if (tb[IFLA_IFNAME])
451 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
452 else
453 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
454
455 err = register_netdevice(dev);
456 if (err < 0)
457 goto err_register_dev;
458
459 netif_carrier_off(dev);
460
461 /*
462 * tie the deviced together
463 */
464
465 priv = netdev_priv(dev);
466 rcu_assign_pointer(priv->peer, peer);
467
468 priv = netdev_priv(peer);
469 rcu_assign_pointer(priv->peer, dev);
470 return 0;
471
472err_register_dev:
473 /* nothing to do */
474err_configure_peer:
475 unregister_netdevice(peer);
476 return err;
477
478err_register_peer:
479 free_netdev(peer);
480 return err;
481}
482
483static void veth_dellink(struct net_device *dev, struct list_head *head)
484{
485 struct veth_priv *priv;
486 struct net_device *peer;
487
488 priv = netdev_priv(dev);
489 peer = rtnl_dereference(priv->peer);
490
491 /* Note : dellink() is called from default_device_exit_batch(),
492 * before a rcu_synchronize() point. The devices are guaranteed
493 * not being freed before one RCU grace period.
494 */
495 RCU_INIT_POINTER(priv->peer, NULL);
496 unregister_netdevice_queue(dev, head);
497
498 if (peer) {
499 priv = netdev_priv(peer);
500 RCU_INIT_POINTER(priv->peer, NULL);
501 unregister_netdevice_queue(peer, head);
502 }
503}
504
505static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
506 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
507};
508
509static struct net *veth_get_link_net(const struct net_device *dev)
510{
511 struct veth_priv *priv = netdev_priv(dev);
512 struct net_device *peer = rtnl_dereference(priv->peer);
513
514 return peer ? dev_net(peer) : dev_net(dev);
515}
516
517static struct rtnl_link_ops veth_link_ops = {
518 .kind = DRV_NAME,
519 .priv_size = sizeof(struct veth_priv),
520 .setup = veth_setup,
521 .validate = veth_validate,
522 .newlink = veth_newlink,
523 .dellink = veth_dellink,
524 .policy = veth_policy,
525 .maxtype = VETH_INFO_MAX,
526 .get_link_net = veth_get_link_net,
527};
528
529/*
530 * init/fini
531 */
532
533static __init int veth_init(void)
534{
535 return rtnl_link_register(&veth_link_ops);
536}
537
538static __exit void veth_exit(void)
539{
540 rtnl_link_unregister(&veth_link_ops);
541}
542
543module_init(veth_init);
544module_exit(veth_exit);
545
546MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
547MODULE_LICENSE("GPL v2");
548MODULE_ALIAS_RTNL_LINK(DRV_NAME);