Merge git://git.kernel.org/pub/scm/linux/kernel/git/lwfinger/linux-staging into stagi...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / l2tp / l2tp_eth.c
bloba8193f52c13c28ddb17c3e1c100b009d259a3d8f
1 /*
2 * L2TPv3 ethernet pseudowire driver
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/skbuff.h>
14 #include <linux/socket.h>
15 #include <linux/hash.h>
16 #include <linux/l2tp.h>
17 #include <linux/in.h>
18 #include <linux/etherdevice.h>
19 #include <linux/spinlock.h>
20 #include <net/sock.h>
21 #include <net/ip.h>
22 #include <net/icmp.h>
23 #include <net/udp.h>
24 #include <net/inet_common.h>
25 #include <net/inet_hashtables.h>
26 #include <net/tcp_states.h>
27 #include <net/protocol.h>
28 #include <net/xfrm.h>
29 #include <net/net_namespace.h>
30 #include <net/netns/generic.h>
32 #include "l2tp_core.h"
34 /* Default device name. May be overridden by name specified by user */
35 #define L2TP_ETH_DEV_NAME "l2tpeth%d"
37 /* via netdev_priv() */
38 struct l2tp_eth {
39 struct net_device *dev;
40 struct sock *tunnel_sock;
41 struct l2tp_session *session;
42 struct list_head list;
45 /* via l2tp_session_priv() */
46 struct l2tp_eth_sess {
47 struct net_device *dev;
50 /* per-net private data for this module */
51 static unsigned int l2tp_eth_net_id;
52 struct l2tp_eth_net {
53 struct list_head l2tp_eth_dev_list;
54 spinlock_t l2tp_eth_lock;
57 static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
59 return net_generic(net, l2tp_eth_net_id);
62 static int l2tp_eth_dev_init(struct net_device *dev)
64 struct l2tp_eth *priv = netdev_priv(dev);
66 priv->dev = dev;
67 random_ether_addr(dev->dev_addr);
68 memset(&dev->broadcast[0], 0xff, 6);
70 return 0;
73 static void l2tp_eth_dev_uninit(struct net_device *dev)
75 struct l2tp_eth *priv = netdev_priv(dev);
76 struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
78 spin_lock(&pn->l2tp_eth_lock);
79 list_del_init(&priv->list);
80 spin_unlock(&pn->l2tp_eth_lock);
81 dev_put(dev);
84 static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
86 struct l2tp_eth *priv = netdev_priv(dev);
87 struct l2tp_session *session = priv->session;
89 l2tp_xmit_skb(session, skb, session->hdr_len);
91 dev->stats.tx_bytes += skb->len;
92 dev->stats.tx_packets++;
94 return 0;
97 static struct net_device_ops l2tp_eth_netdev_ops = {
98 .ndo_init = l2tp_eth_dev_init,
99 .ndo_uninit = l2tp_eth_dev_uninit,
100 .ndo_start_xmit = l2tp_eth_dev_xmit,
103 static void l2tp_eth_dev_setup(struct net_device *dev)
105 ether_setup(dev);
107 dev->netdev_ops = &l2tp_eth_netdev_ops;
108 dev->destructor = free_netdev;
111 static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
113 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
114 struct net_device *dev = spriv->dev;
116 if (session->debug & L2TP_MSG_DATA) {
117 unsigned int length;
118 int offset;
119 u8 *ptr = skb->data;
121 length = min(32u, skb->len);
122 if (!pskb_may_pull(skb, length))
123 goto error;
125 printk(KERN_DEBUG "%s: eth recv: ", session->name);
127 offset = 0;
128 do {
129 printk(" %02X", ptr[offset]);
130 } while (++offset < length);
132 printk("\n");
135 if (!pskb_may_pull(skb, sizeof(ETH_HLEN)))
136 goto error;
138 secpath_reset(skb);
140 /* checksums verified by L2TP */
141 skb->ip_summed = CHECKSUM_NONE;
143 skb_dst_drop(skb);
144 nf_reset(skb);
146 if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
147 dev->stats.rx_packets++;
148 dev->stats.rx_bytes += data_len;
149 } else
150 dev->stats.rx_errors++;
152 return;
154 error:
155 dev->stats.rx_errors++;
156 kfree_skb(skb);
159 static void l2tp_eth_delete(struct l2tp_session *session)
161 struct l2tp_eth_sess *spriv;
162 struct net_device *dev;
164 if (session) {
165 spriv = l2tp_session_priv(session);
166 dev = spriv->dev;
167 if (dev) {
168 unregister_netdev(dev);
169 spriv->dev = NULL;
174 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
175 static void l2tp_eth_show(struct seq_file *m, void *arg)
177 struct l2tp_session *session = arg;
178 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
179 struct net_device *dev = spriv->dev;
181 seq_printf(m, " interface %s\n", dev->name);
183 #endif
185 static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
187 struct net_device *dev;
188 char name[IFNAMSIZ];
189 struct l2tp_tunnel *tunnel;
190 struct l2tp_session *session;
191 struct l2tp_eth *priv;
192 struct l2tp_eth_sess *spriv;
193 int rc;
194 struct l2tp_eth_net *pn;
196 tunnel = l2tp_tunnel_find(net, tunnel_id);
197 if (!tunnel) {
198 rc = -ENODEV;
199 goto out;
202 session = l2tp_session_find(net, tunnel, session_id);
203 if (session) {
204 rc = -EEXIST;
205 goto out;
208 if (cfg->ifname) {
209 dev = dev_get_by_name(net, cfg->ifname);
210 if (dev) {
211 dev_put(dev);
212 rc = -EEXIST;
213 goto out;
215 strlcpy(name, cfg->ifname, IFNAMSIZ);
216 } else
217 strcpy(name, L2TP_ETH_DEV_NAME);
219 session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
220 peer_session_id, cfg);
221 if (!session) {
222 rc = -ENOMEM;
223 goto out;
226 dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
227 if (!dev) {
228 rc = -ENOMEM;
229 goto out_del_session;
232 dev_net_set(dev, net);
233 if (session->mtu == 0)
234 session->mtu = dev->mtu - session->hdr_len;
235 dev->mtu = session->mtu;
236 dev->needed_headroom += session->hdr_len;
238 priv = netdev_priv(dev);
239 priv->dev = dev;
240 priv->session = session;
241 INIT_LIST_HEAD(&priv->list);
243 priv->tunnel_sock = tunnel->sock;
244 session->recv_skb = l2tp_eth_dev_recv;
245 session->session_close = l2tp_eth_delete;
246 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
247 session->show = l2tp_eth_show;
248 #endif
250 spriv = l2tp_session_priv(session);
251 spriv->dev = dev;
253 rc = register_netdev(dev);
254 if (rc < 0)
255 goto out_del_dev;
257 /* Must be done after register_netdev() */
258 strlcpy(session->ifname, dev->name, IFNAMSIZ);
260 dev_hold(dev);
261 pn = l2tp_eth_pernet(dev_net(dev));
262 spin_lock(&pn->l2tp_eth_lock);
263 list_add(&priv->list, &pn->l2tp_eth_dev_list);
264 spin_unlock(&pn->l2tp_eth_lock);
266 return 0;
268 out_del_dev:
269 free_netdev(dev);
270 out_del_session:
271 l2tp_session_delete(session);
272 out:
273 return rc;
276 static __net_init int l2tp_eth_init_net(struct net *net)
278 struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
280 INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
281 spin_lock_init(&pn->l2tp_eth_lock);
283 return 0;
286 static struct pernet_operations l2tp_eth_net_ops = {
287 .init = l2tp_eth_init_net,
288 .id = &l2tp_eth_net_id,
289 .size = sizeof(struct l2tp_eth_net),
293 static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
294 .session_create = l2tp_eth_create,
295 .session_delete = l2tp_session_delete,
299 static int __init l2tp_eth_init(void)
301 int err = 0;
303 err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
304 if (err)
305 goto out;
307 err = register_pernet_device(&l2tp_eth_net_ops);
308 if (err)
309 goto out_unreg;
311 printk(KERN_INFO "L2TP ethernet pseudowire support (L2TPv3)\n");
313 return 0;
315 out_unreg:
316 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
317 out:
318 return err;
321 static void __exit l2tp_eth_exit(void)
323 unregister_pernet_device(&l2tp_eth_net_ops);
324 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
327 module_init(l2tp_eth_init);
328 module_exit(l2tp_eth_exit);
330 MODULE_LICENSE("GPL");
331 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
332 MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
333 MODULE_VERSION("1.0");