blob: e1da42aaf9de94891e6bff691b129c2e362334fd [file] [log] [blame]
Pavel Emelyanove314dbd2007-09-25 16:14:46 -07001/*
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
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070011#include <linux/netdevice.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070013#include <linux/ethtool.h>
14#include <linux/etherdevice.h>
Eric Dumazetcf05c702011-06-19 22:48:34 -070015#include <linux/u64_stats_sync.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070016
17#include <net/dst.h>
18#include <net/xfrm.h>
Stephen Hemmingerecef9692007-12-25 17:23:59 -080019#include <linux/veth.h>
Paul Gortmaker9d9779e2011-07-03 15:21:01 -040020#include <linux/module.h>
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070021
22#define DRV_NAME "veth"
23#define DRV_VERSION "1.0"
24
Eric Biederman38d40812009-03-03 23:36:04 -080025#define MIN_MTU 68 /* Min L3 MTU */
26#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
Eric Biederman38d40812009-03-03 23:36:04 -080027
Eric Dumazet26811282012-12-29 16:02:43 +000028struct pcpu_vstats {
29 u64 packets;
30 u64 bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -070031 struct u64_stats_sync syncp;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070032};
33
34struct veth_priv {
Eric Dumazetd0e2c552013-01-04 15:42:40 +000035 struct net_device __rcu *peer;
Eric Dumazet26811282012-12-29 16:02:43 +000036 atomic64_t dropped;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070037};
38
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070039/*
40 * ethtool interface
41 */
42
43static struct {
44 const char string[ETH_GSTRING_LEN];
45} ethtool_stats_keys[] = {
46 { "peer_ifindex" },
47};
48
49static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
50{
51 cmd->supported = 0;
52 cmd->advertising = 0;
David Decotigny70739492011-04-27 18:32:40 +000053 ethtool_cmd_speed_set(cmd, SPEED_10000);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070054 cmd->duplex = DUPLEX_FULL;
55 cmd->port = PORT_TP;
56 cmd->phy_address = 0;
57 cmd->transceiver = XCVR_INTERNAL;
58 cmd->autoneg = AUTONEG_DISABLE;
59 cmd->maxtxpkt = 0;
60 cmd->maxrxpkt = 0;
61 return 0;
62}
63
64static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
65{
Rick Jones33a5ba12011-11-15 14:59:53 +000066 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
67 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070068}
69
70static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
71{
72 switch(stringset) {
73 case ETH_SS_STATS:
74 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
75 break;
76 }
77}
78
Jeff Garzikb9f2c042007-10-03 18:07:32 -070079static int veth_get_sset_count(struct net_device *dev, int sset)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070080{
Jeff Garzikb9f2c042007-10-03 18:07:32 -070081 switch (sset) {
82 case ETH_SS_STATS:
83 return ARRAY_SIZE(ethtool_stats_keys);
84 default:
85 return -EOPNOTSUPP;
86 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070087}
88
89static void veth_get_ethtool_stats(struct net_device *dev,
90 struct ethtool_stats *stats, u64 *data)
91{
Eric Dumazetd0e2c552013-01-04 15:42:40 +000092 struct veth_priv *priv = netdev_priv(dev);
93 struct net_device *peer = rtnl_dereference(priv->peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070094
Eric Dumazetd0e2c552013-01-04 15:42:40 +000095 data[0] = peer ? peer->ifindex : 0;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070096}
97
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070098static const struct ethtool_ops veth_ethtool_ops = {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -070099 .get_settings = veth_get_settings,
100 .get_drvinfo = veth_get_drvinfo,
101 .get_link = ethtool_op_get_link,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700102 .get_strings = veth_get_strings,
Jeff Garzikb9f2c042007-10-03 18:07:32 -0700103 .get_sset_count = veth_get_sset_count,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700104 .get_ethtool_stats = veth_get_ethtool_stats,
105};
106
Stephen Hemminger424efe92009-08-31 19:50:51 +0000107static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700108{
Eric Dumazet26811282012-12-29 16:02:43 +0000109 struct veth_priv *priv = netdev_priv(dev);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000110 struct net_device *rcv;
Eric Dumazet26811282012-12-29 16:02:43 +0000111 int length = skb->len;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700112
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000113 rcu_read_lock();
114 rcv = rcu_dereference(priv->peer);
115 if (unlikely(!rcv)) {
116 kfree_skb(skb);
117 goto drop;
118 }
Michał Mirosław0b796752010-12-14 12:35:13 +0000119 /* don't change ip_summed == CHECKSUM_PARTIAL, as that
Eric Dumazet26811282012-12-29 16:02:43 +0000120 * will cause bad checksum on forwarded packets
121 */
Michał Mirosława2c725f2011-03-31 01:01:35 +0000122 if (skb->ip_summed == CHECKSUM_NONE &&
123 rcv->features & NETIF_F_RXCSUM)
124 skb->ip_summed = CHECKSUM_UNNECESSARY;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700125
Eric Dumazet26811282012-12-29 16:02:43 +0000126 if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
127 struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700128
Eric Dumazet26811282012-12-29 16:02:43 +0000129 u64_stats_update_begin(&stats->syncp);
130 stats->bytes += length;
131 stats->packets++;
132 u64_stats_update_end(&stats->syncp);
133 } else {
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000134drop:
Eric Dumazet26811282012-12-29 16:02:43 +0000135 atomic64_inc(&priv->dropped);
136 }
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000137 rcu_read_unlock();
Patrick McHardy6ed10652009-06-23 06:03:08 +0000138 return NETDEV_TX_OK;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700139}
140
141/*
142 * general routines
143 */
144
Eric Dumazet26811282012-12-29 16:02:43 +0000145static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700146{
Eric Dumazetcf05c702011-06-19 22:48:34 -0700147 struct veth_priv *priv = netdev_priv(dev);
David S. Miller11687a12009-06-25 02:45:42 -0700148 int cpu;
David S. Miller11687a12009-06-25 02:45:42 -0700149
Eric Dumazet26811282012-12-29 16:02:43 +0000150 result->packets = 0;
151 result->bytes = 0;
Eric Dumazet2b1c8b02009-11-18 07:09:39 +0000152 for_each_possible_cpu(cpu) {
Eric Dumazet26811282012-12-29 16:02:43 +0000153 struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
154 u64 packets, bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700155 unsigned int start;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700156
Eric Dumazetcf05c702011-06-19 22:48:34 -0700157 do {
158 start = u64_stats_fetch_begin_bh(&stats->syncp);
Eric Dumazet26811282012-12-29 16:02:43 +0000159 packets = stats->packets;
160 bytes = stats->bytes;
Eric Dumazetcf05c702011-06-19 22:48:34 -0700161 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
Eric Dumazet26811282012-12-29 16:02:43 +0000162 result->packets += packets;
163 result->bytes += bytes;
David S. Miller11687a12009-06-25 02:45:42 -0700164 }
Eric Dumazet26811282012-12-29 16:02:43 +0000165 return atomic64_read(&priv->dropped);
166}
167
168static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
169 struct rtnl_link_stats64 *tot)
170{
171 struct veth_priv *priv = netdev_priv(dev);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000172 struct net_device *peer;
Eric Dumazet26811282012-12-29 16:02:43 +0000173 struct pcpu_vstats one;
174
175 tot->tx_dropped = veth_stats_one(&one, dev);
176 tot->tx_bytes = one.bytes;
177 tot->tx_packets = one.packets;
178
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000179 rcu_read_lock();
180 peer = rcu_dereference(priv->peer);
181 if (peer) {
182 tot->rx_dropped = veth_stats_one(&one, peer);
183 tot->rx_bytes = one.bytes;
184 tot->rx_packets = one.packets;
185 }
186 rcu_read_unlock();
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700187
stephen hemminger6311cc42011-06-08 14:53:59 +0000188 return tot;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700189}
190
191static int veth_open(struct net_device *dev)
192{
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000193 struct veth_priv *priv = netdev_priv(dev);
194 struct net_device *peer = rtnl_dereference(priv->peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700195
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000196 if (!peer)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700197 return -ENOTCONN;
198
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000199 if (peer->flags & IFF_UP) {
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700200 netif_carrier_on(dev);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000201 netif_carrier_on(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700202 }
203 return 0;
204}
205
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000206static int veth_close(struct net_device *dev)
207{
208 struct veth_priv *priv = netdev_priv(dev);
Eric Dumazet2efd32e2013-01-10 08:32:45 +0000209 struct net_device *peer = rtnl_dereference(priv->peer);
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000210
211 netif_carrier_off(dev);
Eric Dumazet2efd32e2013-01-10 08:32:45 +0000212 if (peer)
213 netif_carrier_off(peer);
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000214
215 return 0;
216}
217
Eric Biederman38d40812009-03-03 23:36:04 -0800218static int is_valid_veth_mtu(int new_mtu)
219{
Eric Dumazet807540b2010-09-23 05:40:09 +0000220 return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
Eric Biederman38d40812009-03-03 23:36:04 -0800221}
222
223static int veth_change_mtu(struct net_device *dev, int new_mtu)
224{
225 if (!is_valid_veth_mtu(new_mtu))
226 return -EINVAL;
227 dev->mtu = new_mtu;
228 return 0;
229}
230
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700231static int veth_dev_init(struct net_device *dev)
232{
Eric Dumazet26811282012-12-29 16:02:43 +0000233 dev->vstats = alloc_percpu(struct pcpu_vstats);
234 if (!dev->vstats)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700235 return -ENOMEM;
236
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700237 return 0;
238}
239
David S. Miller11687a12009-06-25 02:45:42 -0700240static void veth_dev_free(struct net_device *dev)
241{
Eric Dumazet26811282012-12-29 16:02:43 +0000242 free_percpu(dev->vstats);
David S. Miller11687a12009-06-25 02:45:42 -0700243 free_netdev(dev);
244}
245
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800246static const struct net_device_ops veth_netdev_ops = {
Daniel Lezcanoee923622009-02-22 00:04:45 -0800247 .ndo_init = veth_dev_init,
248 .ndo_open = veth_open,
Eric W. Biederman2cf48a12009-02-25 19:47:29 +0000249 .ndo_stop = veth_close,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800250 .ndo_start_xmit = veth_xmit,
Eric Biederman38d40812009-03-03 23:36:04 -0800251 .ndo_change_mtu = veth_change_mtu,
stephen hemminger6311cc42011-06-08 14:53:59 +0000252 .ndo_get_stats64 = veth_get_stats64,
Daniel Lezcanoee923622009-02-22 00:04:45 -0800253 .ndo_set_mac_address = eth_mac_addr,
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800254};
255
Eric Dumazet80933152012-12-29 16:26:10 +0000256#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
257 NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
258 NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX)
259
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700260static void veth_setup(struct net_device *dev)
261{
262 ether_setup(dev);
263
Neil Horman550fd082011-07-26 06:05:38 +0000264 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
Hannes Frederic Sowa23ea5a92012-10-30 16:22:01 +0000265 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
Neil Horman550fd082011-07-26 06:05:38 +0000266
Stephen Hemminger4456e7b2008-11-19 21:50:10 -0800267 dev->netdev_ops = &veth_netdev_ops;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700268 dev->ethtool_ops = &veth_ethtool_ops;
269 dev->features |= NETIF_F_LLTX;
Eric Dumazet80933152012-12-29 16:26:10 +0000270 dev->features |= VETH_FEATURES;
David S. Miller11687a12009-06-25 02:45:42 -0700271 dev->destructor = veth_dev_free;
Michał Mirosława2c725f2011-03-31 01:01:35 +0000272
Eric Dumazet80933152012-12-29 16:26:10 +0000273 dev->hw_features = VETH_FEATURES;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700274}
275
276/*
277 * netlink interface
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 }
Eric Biederman38d40812009-03-03 23:36:04 -0800288 if (tb[IFLA_MTU]) {
289 if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
290 return -EINVAL;
291 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700292 return 0;
293}
294
295static struct rtnl_link_ops veth_link_ops;
296
Eric W. Biederman81adee42009-11-08 00:53:51 -0800297static int veth_newlink(struct net *src_net, struct net_device *dev,
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700298 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;
Patrick McHardy3729d502010-02-26 06:34:54 +0000305 struct ifinfomsg *ifmp;
Eric W. Biederman81adee42009-11-08 00:53:51 -0800306 struct net *net;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700307
308 /*
309 * create and register peer first
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700310 */
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700311 if (data != NULL && data[VETH_INFO_PEER] != NULL) {
312 struct nlattr *nla_peer;
313
314 nla_peer = data[VETH_INFO_PEER];
Patrick McHardy3729d502010-02-26 06:34:54 +0000315 ifmp = nla_data(nla_peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700316 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;
Patrick McHardy3729d502010-02-26 06:34:54 +0000328 } else {
329 ifmp = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700330 tbp = tb;
Patrick McHardy3729d502010-02-26 06:34:54 +0000331 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700332
333 if (tbp[IFLA_IFNAME])
334 nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
335 else
336 snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
337
Eric W. Biederman81adee42009-11-08 00:53:51 -0800338 net = rtnl_link_get_net(src_net, tbp);
339 if (IS_ERR(net))
340 return PTR_ERR(net);
341
Rami Rosenc0713562012-11-30 01:08:47 +0000342 peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800343 if (IS_ERR(peer)) {
344 put_net(net);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700345 return PTR_ERR(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800346 }
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700347
348 if (tbp[IFLA_ADDRESS] == NULL)
Danny Kukawkaf2cedb62012-02-15 06:45:39 +0000349 eth_hw_addr_random(peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700350
Pavel Emelyanove6f8f1a2012-08-08 21:53:03 +0000351 if (ifmp && (dev->ifindex != 0))
352 peer->ifindex = ifmp->ifi_index;
353
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700354 err = register_netdevice(peer);
Eric W. Biederman81adee42009-11-08 00:53:51 -0800355 put_net(net);
356 net = NULL;
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700357 if (err < 0)
358 goto err_register_peer;
359
360 netif_carrier_off(peer);
361
Patrick McHardy3729d502010-02-26 06:34:54 +0000362 err = rtnl_configure_link(peer, ifmp);
363 if (err < 0)
364 goto err_configure_peer;
365
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700366 /*
367 * register dev last
368 *
369 * note, that since we've registered new device the dev's name
370 * should be re-allocated
371 */
372
373 if (tb[IFLA_ADDRESS] == NULL)
Danny Kukawkaf2cedb62012-02-15 06:45:39 +0000374 eth_hw_addr_random(dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700375
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000376 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
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700387 err = register_netdevice(dev);
388 if (err < 0)
389 goto err_register_dev;
390
391 netif_carrier_off(dev);
392
393 /*
394 * tie the deviced together
395 */
396
397 priv = netdev_priv(dev);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000398 rcu_assign_pointer(priv->peer, peer);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700399
400 priv = netdev_priv(peer);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000401 rcu_assign_pointer(priv->peer, dev);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700402 return 0;
403
404err_register_dev:
405 /* nothing to do */
Jiri Pirko6c8c4442011-04-30 01:28:17 +0000406err_alloc_name:
Patrick McHardy3729d502010-02-26 06:34:54 +0000407err_configure_peer:
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700408 unregister_netdevice(peer);
409 return err;
410
411err_register_peer:
412 free_netdev(peer);
413 return err;
414}
415
Eric Dumazet23289a32009-10-27 07:06:36 +0000416static void veth_dellink(struct net_device *dev, struct list_head *head)
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700417{
418 struct veth_priv *priv;
419 struct net_device *peer;
420
421 priv = netdev_priv(dev);
Eric Dumazetd0e2c552013-01-04 15:42:40 +0000422 peer = rtnl_dereference(priv->peer);
423
424 /* Note : dellink() is called from default_device_exit_batch(),
425 * before a rcu_synchronize() point. The devices are guaranteed
426 * not being freed before one RCU grace period.
427 */
428 RCU_INIT_POINTER(priv->peer, NULL);
429
430 priv = netdev_priv(peer);
431 RCU_INIT_POINTER(priv->peer, NULL);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700432
Eric Dumazet24540532009-10-30 01:00:27 -0700433 unregister_netdevice_queue(dev, head);
434 unregister_netdevice_queue(peer, head);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700435}
436
Thomas Graf23711432012-02-15 04:09:46 +0000437static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
438 [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
439};
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700440
441static struct rtnl_link_ops veth_link_ops = {
442 .kind = DRV_NAME,
443 .priv_size = sizeof(struct veth_priv),
444 .setup = veth_setup,
445 .validate = veth_validate,
446 .newlink = veth_newlink,
447 .dellink = veth_dellink,
448 .policy = veth_policy,
449 .maxtype = VETH_INFO_MAX,
450};
451
452/*
453 * init/fini
454 */
455
456static __init int veth_init(void)
457{
458 return rtnl_link_register(&veth_link_ops);
459}
460
461static __exit void veth_exit(void)
462{
Patrick McHardy68365452008-01-20 17:25:14 -0800463 rtnl_link_unregister(&veth_link_ops);
Pavel Emelyanove314dbd2007-09-25 16:14:46 -0700464}
465
466module_init(veth_init);
467module_exit(veth_exit);
468
469MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
470MODULE_LICENSE("GPL v2");
471MODULE_ALIAS_RTNL_LINK(DRV_NAME);