blob: 58c6c4cda73b576cd65d3121a9abdf67bc6f7668 [file] [log] [blame]
James Chapmand9e31d12010-04-02 06:19:26 +00001/*
2 * L2TPv3 ethernet pseudowire driver
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
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.
10 */
11
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>
31
32#include "l2tp_core.h"
33
34/* Default device name. May be overridden by name specified by user */
35#define L2TP_ETH_DEV_NAME "l2tpeth%d"
36
37/* via netdev_priv() */
38struct l2tp_eth {
39 struct net_device *dev;
40 struct sock *tunnel_sock;
41 struct l2tp_session *session;
42 struct list_head list;
43};
44
45/* via l2tp_session_priv() */
46struct l2tp_eth_sess {
47 struct net_device *dev;
48};
49
50/* per-net private data for this module */
51static unsigned int l2tp_eth_net_id;
52struct l2tp_eth_net {
53 struct list_head l2tp_eth_dev_list;
54 spinlock_t l2tp_eth_lock;
55};
56
57static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
58{
59 return net_generic(net, l2tp_eth_net_id);
60}
61
62static int l2tp_eth_dev_init(struct net_device *dev)
63{
64 struct l2tp_eth *priv = netdev_priv(dev);
65
66 priv->dev = dev;
67 random_ether_addr(dev->dev_addr);
68 memset(&dev->broadcast[0], 0xff, 6);
69
70 return 0;
71}
72
73static void l2tp_eth_dev_uninit(struct net_device *dev)
74{
75 struct l2tp_eth *priv = netdev_priv(dev);
76 struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
77
78 spin_lock(&pn->l2tp_eth_lock);
79 list_del_init(&priv->list);
80 spin_unlock(&pn->l2tp_eth_lock);
81 dev_put(dev);
82}
83
84static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
85{
86 struct l2tp_eth *priv = netdev_priv(dev);
87 struct l2tp_session *session = priv->session;
88
89 l2tp_xmit_skb(session, skb, session->hdr_len);
90
91 dev->stats.tx_bytes += skb->len;
92 dev->stats.tx_packets++;
93
94 return 0;
95}
96
97static 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,
101};
102
103static void l2tp_eth_dev_setup(struct net_device *dev)
104{
105 ether_setup(dev);
106
107 dev->netdev_ops = &l2tp_eth_netdev_ops;
108 dev->destructor = free_netdev;
109}
110
111static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
112{
113 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
114 struct net_device *dev = spriv->dev;
115
116 if (session->debug & L2TP_MSG_DATA) {
117 unsigned int length;
118 int offset;
119 u8 *ptr = skb->data;
120
121 length = min(32u, skb->len);
122 if (!pskb_may_pull(skb, length))
123 goto error;
124
125 printk(KERN_DEBUG "%s: eth recv: ", session->name);
126
127 offset = 0;
128 do {
129 printk(" %02X", ptr[offset]);
130 } while (++offset < length);
131
132 printk("\n");
133 }
134
135 if (data_len < ETH_HLEN)
136 goto error;
137
138 secpath_reset(skb);
139
140 /* checksums verified by L2TP */
141 skb->ip_summed = CHECKSUM_NONE;
142
143 skb_dst_drop(skb);
144 nf_reset(skb);
145
146 if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
147 dev->last_rx = jiffies;
148 dev->stats.rx_packets++;
149 dev->stats.rx_bytes += data_len;
150 } else
151 dev->stats.rx_errors++;
152
153 return;
154
155error:
156 dev->stats.rx_errors++;
157 kfree_skb(skb);
158}
159
160static void l2tp_eth_delete(struct l2tp_session *session)
161{
162 struct l2tp_eth_sess *spriv;
163 struct net_device *dev;
164
165 if (session) {
166 spriv = l2tp_session_priv(session);
167 dev = spriv->dev;
168 if (dev) {
169 unregister_netdev(dev);
170 spriv->dev = NULL;
171 }
172 }
173}
174
David S. Millerf66ef2d2010-04-03 15:01:37 -0700175#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
James Chapman0ad66142010-04-02 06:19:33 +0000176static void l2tp_eth_show(struct seq_file *m, void *arg)
177{
178 struct l2tp_session *session = arg;
179 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
180 struct net_device *dev = spriv->dev;
181
182 seq_printf(m, " interface %s\n", dev->name);
183}
184#endif
185
James Chapmand9e31d12010-04-02 06:19:26 +0000186static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
187{
188 struct net_device *dev;
189 char name[IFNAMSIZ];
190 struct l2tp_tunnel *tunnel;
191 struct l2tp_session *session;
192 struct l2tp_eth *priv;
193 struct l2tp_eth_sess *spriv;
194 int rc;
195 struct l2tp_eth_net *pn;
196
197 tunnel = l2tp_tunnel_find(net, tunnel_id);
198 if (!tunnel) {
199 rc = -ENODEV;
200 goto out;
201 }
202
203 session = l2tp_session_find(net, tunnel, session_id);
204 if (session) {
205 rc = -EEXIST;
206 goto out;
207 }
208
209 if (cfg->ifname) {
210 dev = dev_get_by_name(net, cfg->ifname);
211 if (dev) {
212 dev_put(dev);
213 rc = -EEXIST;
214 goto out;
215 }
216 strlcpy(name, cfg->ifname, IFNAMSIZ);
217 } else
218 strcpy(name, L2TP_ETH_DEV_NAME);
219
220 session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
221 peer_session_id, cfg);
222 if (!session) {
223 rc = -ENOMEM;
224 goto out;
225 }
226
227 dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
228 if (!dev) {
229 rc = -ENOMEM;
230 goto out_del_session;
231 }
232
233 dev_net_set(dev, net);
234 if (session->mtu == 0)
235 session->mtu = dev->mtu - session->hdr_len;
236 dev->mtu = session->mtu;
237 dev->needed_headroom += session->hdr_len;
238
239 priv = netdev_priv(dev);
240 priv->dev = dev;
241 priv->session = session;
242 INIT_LIST_HEAD(&priv->list);
243
244 priv->tunnel_sock = tunnel->sock;
245 session->recv_skb = l2tp_eth_dev_recv;
246 session->session_close = l2tp_eth_delete;
David S. Millerf66ef2d2010-04-03 15:01:37 -0700247#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
James Chapman0ad66142010-04-02 06:19:33 +0000248 session->show = l2tp_eth_show;
249#endif
James Chapmand9e31d12010-04-02 06:19:26 +0000250
251 spriv = l2tp_session_priv(session);
252 spriv->dev = dev;
253
254 rc = register_netdev(dev);
255 if (rc < 0)
256 goto out_del_dev;
257
258 /* Must be done after register_netdev() */
259 strlcpy(session->ifname, dev->name, IFNAMSIZ);
260
261 dev_hold(dev);
262 pn = l2tp_eth_pernet(dev_net(dev));
263 spin_lock(&pn->l2tp_eth_lock);
264 list_add(&priv->list, &pn->l2tp_eth_dev_list);
265 spin_unlock(&pn->l2tp_eth_lock);
266
267 return 0;
268
269out_del_dev:
270 free_netdev(dev);
271out_del_session:
272 l2tp_session_delete(session);
273out:
274 return rc;
275}
276
277static __net_init int l2tp_eth_init_net(struct net *net)
278{
Jiri Pirko3a737022010-04-23 01:01:52 +0000279 struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
James Chapmand9e31d12010-04-02 06:19:26 +0000280
281 INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
282 spin_lock_init(&pn->l2tp_eth_lock);
283
James Chapmand9e31d12010-04-02 06:19:26 +0000284 return 0;
James Chapmand9e31d12010-04-02 06:19:26 +0000285}
286
287static __net_initdata struct pernet_operations l2tp_eth_net_ops = {
288 .init = l2tp_eth_init_net,
James Chapmand9e31d12010-04-02 06:19:26 +0000289 .id = &l2tp_eth_net_id,
290 .size = sizeof(struct l2tp_eth_net),
291};
292
293
294static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
295 .session_create = l2tp_eth_create,
296 .session_delete = l2tp_session_delete,
297};
298
299
300static int __init l2tp_eth_init(void)
301{
302 int err = 0;
303
304 err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
305 if (err)
306 goto out;
307
308 err = register_pernet_device(&l2tp_eth_net_ops);
309 if (err)
310 goto out_unreg;
311
312 printk(KERN_INFO "L2TP ethernet pseudowire support (L2TPv3)\n");
313
314 return 0;
315
316out_unreg:
317 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
318out:
319 return err;
320}
321
322static void __exit l2tp_eth_exit(void)
323{
324 unregister_pernet_device(&l2tp_eth_net_ops);
325 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
326}
327
328module_init(l2tp_eth_init);
329module_exit(l2tp_eth_exit);
330
331MODULE_LICENSE("GPL");
332MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
333MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
334MODULE_VERSION("1.0");