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11#include <linux/netdevice.h>
12#include <linux/ethtool.h>
13#include <linux/etherdevice.h>
14
15#include <net/dst.h>
16#include <net/xfrm.h>
17#include <linux/veth.h>
18
19#define DRV_NAME "veth"
20#define DRV_VERSION "1.0"
21
22#define MIN_MTU 68
23#define MAX_MTU 65535
24#define MTU_PAD (ETH_HLEN + 4)
25
26struct veth_net_stats {
27 unsigned long rx_packets;
28 unsigned long tx_packets;
29 unsigned long rx_bytes;
30 unsigned long tx_bytes;
31 unsigned long tx_dropped;
32 unsigned long rx_dropped;
33};
34
35struct veth_priv {
36 struct net_device *peer;
37 struct veth_net_stats *stats;
38 unsigned ip_summed;
39};
40
41
42
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 cmd->speed = 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 strcpy(info->driver, DRV_NAME);
69 strcpy(info->version, DRV_VERSION);
70 strcpy(info->fw_version, "N/A");
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 u32 veth_get_rx_csum(struct net_device *dev)
102{
103 struct veth_priv *priv;
104
105 priv = netdev_priv(dev);
106 return priv->ip_summed == CHECKSUM_UNNECESSARY;
107}
108
109static int veth_set_rx_csum(struct net_device *dev, u32 data)
110{
111 struct veth_priv *priv;
112
113 priv = netdev_priv(dev);
114 priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
115 return 0;
116}
117
118static u32 veth_get_tx_csum(struct net_device *dev)
119{
120 return (dev->features & NETIF_F_NO_CSUM) != 0;
121}
122
123static int veth_set_tx_csum(struct net_device *dev, u32 data)
124{
125 if (data)
126 dev->features |= NETIF_F_NO_CSUM;
127 else
128 dev->features &= ~NETIF_F_NO_CSUM;
129 return 0;
130}
131
132static const struct ethtool_ops veth_ethtool_ops = {
133 .get_settings = veth_get_settings,
134 .get_drvinfo = veth_get_drvinfo,
135 .get_link = ethtool_op_get_link,
136 .get_rx_csum = veth_get_rx_csum,
137 .set_rx_csum = veth_set_rx_csum,
138 .get_tx_csum = veth_get_tx_csum,
139 .set_tx_csum = veth_set_tx_csum,
140 .get_sg = ethtool_op_get_sg,
141 .set_sg = ethtool_op_set_sg,
142 .get_strings = veth_get_strings,
143 .get_sset_count = veth_get_sset_count,
144 .get_ethtool_stats = veth_get_ethtool_stats,
145};
146
147
148
149
150
151static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
152{
153 struct net_device *rcv = NULL;
154 struct veth_priv *priv, *rcv_priv;
155 struct veth_net_stats *stats, *rcv_stats;
156 int length, cpu;
157
158 skb_orphan(skb);
159
160 priv = netdev_priv(dev);
161 rcv = priv->peer;
162 rcv_priv = netdev_priv(rcv);
163
164 cpu = smp_processor_id();
165 stats = per_cpu_ptr(priv->stats, cpu);
166 rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu);
167
168 if (!(rcv->flags & IFF_UP))
169 goto tx_drop;
170
171 if (skb->len > (rcv->mtu + MTU_PAD))
172 goto rx_drop;
173
174 skb->tstamp.tv64 = 0;
175 skb->pkt_type = PACKET_HOST;
176 skb->protocol = eth_type_trans(skb, rcv);
177 if (dev->features & NETIF_F_NO_CSUM)
178 skb->ip_summed = rcv_priv->ip_summed;
179
180 skb->mark = 0;
181 secpath_reset(skb);
182 nf_reset(skb);
183
184 length = skb->len;
185
186 stats->tx_bytes += length;
187 stats->tx_packets++;
188
189 rcv_stats->rx_bytes += length;
190 rcv_stats->rx_packets++;
191
192 netif_rx(skb);
193 return NETDEV_TX_OK;
194
195tx_drop:
196 kfree_skb(skb);
197 stats->tx_dropped++;
198 return NETDEV_TX_OK;
199
200rx_drop:
201 kfree_skb(skb);
202 rcv_stats->rx_dropped++;
203 return NETDEV_TX_OK;
204}
205
206
207
208
209
210static struct net_device_stats *veth_get_stats(struct net_device *dev)
211{
212 struct veth_priv *priv;
213 int cpu;
214 struct veth_net_stats *stats, total = {0};
215
216 priv = netdev_priv(dev);
217
218 for_each_possible_cpu(cpu) {
219 stats = per_cpu_ptr(priv->stats, cpu);
220
221 total.rx_packets += stats->rx_packets;
222 total.tx_packets += stats->tx_packets;
223 total.rx_bytes += stats->rx_bytes;
224 total.tx_bytes += stats->tx_bytes;
225 total.tx_dropped += stats->tx_dropped;
226 total.rx_dropped += stats->rx_dropped;
227 }
228 dev->stats.rx_packets = total.rx_packets;
229 dev->stats.tx_packets = total.tx_packets;
230 dev->stats.rx_bytes = total.rx_bytes;
231 dev->stats.tx_bytes = total.tx_bytes;
232 dev->stats.tx_dropped = total.tx_dropped;
233 dev->stats.rx_dropped = total.rx_dropped;
234
235 return &dev->stats;
236}
237
238static int veth_open(struct net_device *dev)
239{
240 struct veth_priv *priv;
241
242 priv = netdev_priv(dev);
243 if (priv->peer == NULL)
244 return -ENOTCONN;
245
246 if (priv->peer->flags & IFF_UP) {
247 netif_carrier_on(dev);
248 netif_carrier_on(priv->peer);
249 }
250 return 0;
251}
252
253static int veth_close(struct net_device *dev)
254{
255 struct veth_priv *priv = netdev_priv(dev);
256
257 netif_carrier_off(dev);
258 netif_carrier_off(priv->peer);
259
260 return 0;
261}
262
263static int is_valid_veth_mtu(int new_mtu)
264{
265 return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
266}
267
268static int veth_change_mtu(struct net_device *dev, int new_mtu)
269{
270 if (!is_valid_veth_mtu(new_mtu))
271 return -EINVAL;
272 dev->mtu = new_mtu;
273 return 0;
274}
275
276static int veth_dev_init(struct net_device *dev)
277{
278 struct veth_net_stats *stats;
279 struct veth_priv *priv;
280
281 stats = alloc_percpu(struct veth_net_stats);
282 if (stats == NULL)
283 return -ENOMEM;
284
285 priv = netdev_priv(dev);
286 priv->stats = stats;
287 return 0;
288}
289
290static void veth_dev_free(struct net_device *dev)
291{
292 struct veth_priv *priv;
293
294 priv = netdev_priv(dev);
295 free_percpu(priv->stats);
296 free_netdev(dev);
297}
298
299static const struct net_device_ops veth_netdev_ops = {
300 .ndo_init = veth_dev_init,
301 .ndo_open = veth_open,
302 .ndo_stop = veth_close,
303 .ndo_start_xmit = veth_xmit,
304 .ndo_change_mtu = veth_change_mtu,
305 .ndo_get_stats = veth_get_stats,
306 .ndo_set_mac_address = eth_mac_addr,
307};
308
309static void veth_setup(struct net_device *dev)
310{
311 ether_setup(dev);
312
313 dev->netdev_ops = &veth_netdev_ops;
314 dev->ethtool_ops = &veth_ethtool_ops;
315 dev->features |= NETIF_F_LLTX;
316 dev->destructor = veth_dev_free;
317}
318
319
320
321
322
323static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
324{
325 if (tb[IFLA_ADDRESS]) {
326 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
327 return -EINVAL;
328 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
329 return -EADDRNOTAVAIL;
330 }
331 if (tb[IFLA_MTU]) {
332 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
333 return -EINVAL;
334 }
335 return 0;
336}
337
338static struct rtnl_link_ops veth_link_ops;
339
340static int veth_newlink(struct net_device *dev,
341 struct nlattr *tb[], struct nlattr *data[])
342{
343 int err;
344 struct net_device *peer;
345 struct veth_priv *priv;
346 char ifname[IFNAMSIZ];
347 struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
348
349
350
351
352
353
354
355
356 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
357 struct nlattr *nla_peer;
358
359 nla_peer = data[VETH_INFO_PEER];
360 err = nla_parse(peer_tb, IFLA_MAX,
361 nla_data(nla_peer) + sizeof(struct ifinfomsg),
362 nla_len(nla_peer) - sizeof(struct ifinfomsg),
363 ifla_policy);
364 if (err < 0)
365 return err;
366
367 err = veth_validate(peer_tb, NULL);
368 if (err < 0)
369 return err;
370
371 tbp = peer_tb;
372 } else
373 tbp = tb;
374
375 if (tbp[IFLA_IFNAME])
376 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
377 else
378 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
379
380 peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
381 if (IS_ERR(peer))
382 return PTR_ERR(peer);
383
384 if (tbp[IFLA_ADDRESS] == NULL)
385 random_ether_addr(peer->dev_addr);
386
387 err = register_netdevice(peer);
388 if (err < 0)
389 goto err_register_peer;
390
391 netif_carrier_off(peer);
392
393
394
395
396
397
398
399
400 if (tb[IFLA_ADDRESS] == NULL)
401 random_ether_addr(dev->dev_addr);
402
403 if (tb[IFLA_IFNAME])
404 nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
405 else
406 snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
407
408 if (strchr(dev->name, '%')) {
409 err = dev_alloc_name(dev, dev->name);
410 if (err < 0)
411 goto err_alloc_name;
412 }
413
414 err = register_netdevice(dev);
415 if (err < 0)
416 goto err_register_dev;
417
418 netif_carrier_off(dev);
419
420
421
422
423
424 priv = netdev_priv(dev);
425 priv->peer = peer;
426
427 priv = netdev_priv(peer);
428 priv->peer = dev;
429 return 0;
430
431err_register_dev:
432
433err_alloc_name:
434 unregister_netdevice(peer);
435 return err;
436
437err_register_peer:
438 free_netdev(peer);
439 return err;
440}
441
442static void veth_dellink(struct net_device *dev)
443{
444 struct veth_priv *priv;
445 struct net_device *peer;
446
447 priv = netdev_priv(dev);
448 peer = priv->peer;
449
450 unregister_netdevice(dev);
451 unregister_netdevice(peer);
452}
453
454static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
455
456static struct rtnl_link_ops veth_link_ops = {
457 .kind = DRV_NAME,
458 .priv_size = sizeof(struct veth_priv),
459 .setup = veth_setup,
460 .validate = veth_validate,
461 .newlink = veth_newlink,
462 .dellink = veth_dellink,
463 .policy = veth_policy,
464 .maxtype = VETH_INFO_MAX,
465};
466
467
468
469
470
471static __init int veth_init(void)
472{
473 return rtnl_link_register(&veth_link_ops);
474}
475
476static __exit void veth_exit(void)
477{
478 rtnl_link_unregister(&veth_link_ops);
479}
480
481module_init(veth_init);
482module_exit(veth_exit);
483
484MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
485MODULE_LICENSE("GPL v2");
486MODULE_ALIAS_RTNL_LINK(DRV_NAME);
487
