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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/dst.h>
18#include <net/xfrm.h>
19#include <linux/veth.h>
20#include <linux/module.h>
21
22#define DRV_NAME "veth"
23#define DRV_VERSION "1.0"
24
25#define MIN_MTU 68
26#define MAX_MTU 65535
27
28struct veth_net_stats {
29 u64 rx_packets;
30 u64 rx_bytes;
31 u64 tx_packets;
32 u64 tx_bytes;
33 u64 rx_dropped;
34 struct u64_stats_sync syncp;
35};
36
37struct veth_priv {
38 struct net_device *peer;
39 struct veth_net_stats __percpu *stats;
40};
41
42
43
44
45
46static struct {
47 const char string[ETH_GSTRING_LEN];
48} ethtool_stats_keys[] = {
49 { "peer_ifindex" },
50};
51
52static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
53{
54 cmd->supported = 0;
55 cmd->advertising = 0;
56 ethtool_cmd_speed_set(cmd, 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
67static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
68{
69 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
70 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
71}
72
73static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
74{
75 switch(stringset) {
76 case ETH_SS_STATS:
77 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
78 break;
79 }
80}
81
82static int veth_get_sset_count(struct net_device *dev, int sset)
83{
84 switch (sset) {
85 case ETH_SS_STATS:
86 return ARRAY_SIZE(ethtool_stats_keys);
87 default:
88 return -EOPNOTSUPP;
89 }
90}
91
92static void veth_get_ethtool_stats(struct net_device *dev,
93 struct ethtool_stats *stats, u64 *data)
94{
95 struct veth_priv *priv;
96
97 priv = netdev_priv(dev);
98 data[0] = priv->peer->ifindex;
99}
100
101static const struct ethtool_ops veth_ethtool_ops = {
102 .get_settings = veth_get_settings,
103 .get_drvinfo = veth_get_drvinfo,
104 .get_link = ethtool_op_get_link,
105 .get_strings = veth_get_strings,
106 .get_sset_count = veth_get_sset_count,
107 .get_ethtool_stats = veth_get_ethtool_stats,
108};
109
110
111
112
113
114static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
115{
116 struct net_device *rcv = NULL;
117 struct veth_priv *priv, *rcv_priv;
118 struct veth_net_stats *stats, *rcv_stats;
119 int length;
120
121 priv = netdev_priv(dev);
122 rcv = priv->peer;
123 rcv_priv = netdev_priv(rcv);
124
125 stats = this_cpu_ptr(priv->stats);
126 rcv_stats = this_cpu_ptr(rcv_priv->stats);
127
128
129
130 if (skb->ip_summed == CHECKSUM_NONE &&
131 rcv->features & NETIF_F_RXCSUM)
132 skb->ip_summed = CHECKSUM_UNNECESSARY;
133
134 length = skb->len;
135 if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS)
136 goto rx_drop;
137
138 u64_stats_update_begin(&stats->syncp);
139 stats->tx_bytes += length;
140 stats->tx_packets++;
141 u64_stats_update_end(&stats->syncp);
142
143 u64_stats_update_begin(&rcv_stats->syncp);
144 rcv_stats->rx_bytes += length;
145 rcv_stats->rx_packets++;
146 u64_stats_update_end(&rcv_stats->syncp);
147
148 return NETDEV_TX_OK;
149
150rx_drop:
151 u64_stats_update_begin(&rcv_stats->syncp);
152 rcv_stats->rx_dropped++;
153 u64_stats_update_end(&rcv_stats->syncp);
154 return NETDEV_TX_OK;
155}
156
157
158
159
160
161static 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 int cpu;
166
167 for_each_possible_cpu(cpu) {
168 struct veth_net_stats *stats = per_cpu_ptr(priv->stats, cpu);
169 u64 rx_packets, rx_bytes, rx_dropped;
170 u64 tx_packets, tx_bytes;
171 unsigned int start;
172
173 do {
174 start = u64_stats_fetch_begin_bh(&stats->syncp);
175 rx_packets = stats->rx_packets;
176 tx_packets = stats->tx_packets;
177 rx_bytes = stats->rx_bytes;
178 tx_bytes = stats->tx_bytes;
179 rx_dropped = stats->rx_dropped;
180 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
181 tot->rx_packets += rx_packets;
182 tot->tx_packets += tx_packets;
183 tot->rx_bytes += rx_bytes;
184 tot->tx_bytes += tx_bytes;
185 tot->rx_dropped += rx_dropped;
186 }
187
188 return tot;
189}
190
191static int veth_open(struct net_device *dev)
192{
193 struct veth_priv *priv;
194
195 priv = netdev_priv(dev);
196 if (priv->peer == NULL)
197 return -ENOTCONN;
198
199 if (priv->peer->flags & IFF_UP) {
200 netif_carrier_on(dev);
201 netif_carrier_on(priv->peer);
202 }
203 return 0;
204}
205
206static int veth_close(struct net_device *dev)
207{
208 struct veth_priv *priv = netdev_priv(dev);
209
210 netif_carrier_off(dev);
211 netif_carrier_off(priv->peer);
212
213 return 0;
214}
215
216static int is_valid_veth_mtu(int new_mtu)
217{
218 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
219}
220
221static int veth_change_mtu(struct net_device *dev, int new_mtu)
222{
223 if (!is_valid_veth_mtu(new_mtu))
224 return -EINVAL;
225 dev->mtu = new_mtu;
226 return 0;
227}
228
229static int veth_dev_init(struct net_device *dev)
230{
231 struct veth_net_stats __percpu *stats;
232 struct veth_priv *priv;
233
234 stats = alloc_percpu(struct veth_net_stats);
235 if (stats == NULL)
236 return -ENOMEM;
237
238 priv = netdev_priv(dev);
239 priv->stats = stats;
240 return 0;
241}
242
243static void veth_dev_free(struct net_device *dev)
244{
245 struct veth_priv *priv;
246
247 priv = netdev_priv(dev);
248 free_percpu(priv->stats);
249 free_netdev(dev);
250}
251
252static const struct net_device_ops veth_netdev_ops = {
253 .ndo_init = veth_dev_init,
254 .ndo_open = veth_open,
255 .ndo_stop = veth_close,
256 .ndo_start_xmit = veth_xmit,
257 .ndo_change_mtu = veth_change_mtu,
258 .ndo_get_stats64 = veth_get_stats64,
259 .ndo_set_mac_address = eth_mac_addr,
260};
261
262static void veth_setup(struct net_device *dev)
263{
264 ether_setup(dev);
265
266 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
267
268 dev->netdev_ops = &veth_netdev_ops;
269 dev->ethtool_ops = &veth_ethtool_ops;
270 dev->features |= NETIF_F_LLTX;
271 dev->destructor = veth_dev_free;
272
273 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
274}
275
276
277
278
279
280static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
281{
282 if (tb[IFLA_ADDRESS]) {
283 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
284 return -EINVAL;
285 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
286 return -EADDRNOTAVAIL;
287 }
288 if (tb[IFLA_MTU]) {
289 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
290 return -EINVAL;
291 }
292 return 0;
293}
294
295static struct rtnl_link_ops veth_link_ops;
296
297static int veth_newlink(struct net *src_net, struct net_device *dev,
298 struct nlattr *tb[], struct nlattr *data[])
299{
300 int err;
301 struct net_device *peer;
302 struct veth_priv *priv;
303 char ifname[IFNAMSIZ];
304 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
305 struct ifinfomsg *ifmp;
306 struct net *net;
307
308
309
310
311 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
312 struct nlattr *nla_peer;
313
314 nla_peer = data[VETH_INFO_PEER];
315 ifmp = nla_data(nla_peer);
316 err = nla_parse(peer_tb, IFLA_MAX,
317 nla_data(nla_peer) + sizeof(struct ifinfomsg),
318 nla_len(nla_peer) - sizeof(struct ifinfomsg),
319 ifla_policy);
320 if (err < 0)
321 return err;
322
323 err = veth_validate(peer_tb, NULL);
324 if (err < 0)
325 return err;
326
327 tbp = peer_tb;
328 } else {
329 ifmp = NULL;
330 tbp = tb;
331 }
332
333 if (tbp[IFLA_IFNAME])
334 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
335 else
336 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
337
338 net = rtnl_link_get_net(src_net, tbp);
339 if (IS_ERR(net))
340 return PTR_ERR(net);
341
342 peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp);
343 if (IS_ERR(peer)) {
344 put_net(net);
345 return PTR_ERR(peer);
346 }
347
348 if (tbp[IFLA_ADDRESS] == NULL)
349 eth_hw_addr_random(peer);
350
351 if (ifmp && (dev->ifindex != 0))
352 peer->ifindex = ifmp->ifi_index;
353
354 err = register_netdevice(peer);
355 put_net(net);
356 net = NULL;
357 if (err < 0)
358 goto err_register_peer;
359
360 netif_carrier_off(peer);
361
362 err = rtnl_configure_link(peer, ifmp);
363 if (err < 0)
364 goto err_configure_peer;
365
366
367
368
369
370
371
372
373 if (tb[IFLA_ADDRESS] == NULL)
374 eth_hw_addr_random(dev);
375
376 if (tb[IFLA_IFNAME])
377 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
378 else
379 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
380
381 if (strchr(dev->name, '%')) {
382 err = dev_alloc_name(dev, dev->name);
383 if (err < 0)
384 goto err_alloc_name;
385 }
386
387 err = register_netdevice(dev);
388 if (err < 0)
389 goto err_register_dev;
390
391 netif_carrier_off(dev);
392
393
394
395
396
397 priv = netdev_priv(dev);
398 priv->peer = peer;
399
400 priv = netdev_priv(peer);
401 priv->peer = dev;
402 return 0;
403
404err_register_dev:
405
406err_alloc_name:
407err_configure_peer:
408 unregister_netdevice(peer);
409 return err;
410
411err_register_peer:
412 free_netdev(peer);
413 return err;
414}
415
416static void veth_dellink(struct net_device *dev, struct list_head *head)
417{
418 struct veth_priv *priv;
419 struct net_device *peer;
420
421 priv = netdev_priv(dev);
422 peer = priv->peer;
423
424 unregister_netdevice_queue(dev, head);
425 unregister_netdevice_queue(peer, head);
426}
427
428static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
429 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
430};
431
432static struct rtnl_link_ops veth_link_ops = {
433 .kind = DRV_NAME,
434 .priv_size = sizeof(struct veth_priv),
435 .setup = veth_setup,
436 .validate = veth_validate,
437 .newlink = veth_newlink,
438 .dellink = veth_dellink,
439 .policy = veth_policy,
440 .maxtype = VETH_INFO_MAX,
441};
442
443
444
445
446
447static __init int veth_init(void)
448{
449 return rtnl_link_register(&veth_link_ops);
450}
451
452static __exit void veth_exit(void)
453{
454 rtnl_link_unregister(&veth_link_ops);
455}
456
457module_init(veth_init);
458module_exit(veth_exit);
459
460MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
461MODULE_LICENSE("GPL v2");
462MODULE_ALIAS_RTNL_LINK(DRV_NAME);
463
