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d9e31d17 JC |
1 | /* |
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() */ | |
38 | struct 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() */ | |
46 | struct l2tp_eth_sess { | |
47 | struct net_device *dev; | |
48 | }; | |
49 | ||
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; | |
55 | }; | |
56 | ||
57 | static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net) | |
58 | { | |
59 | return net_generic(net, l2tp_eth_net_id); | |
60 | } | |
61 | ||
62 | static 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 | ||
73 | static 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 | ||
84 | static 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 | ||
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, | |
101 | }; | |
102 | ||
103 | static 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 | ||
111 | static 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 | ||
bfc960a8 | 135 | if (!pskb_may_pull(skb, sizeof(ETH_HLEN))) |
d9e31d17 JC |
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) { | |
d9e31d17 JC |
147 | dev->stats.rx_packets++; |
148 | dev->stats.rx_bytes += data_len; | |
149 | } else | |
150 | dev->stats.rx_errors++; | |
151 | ||
152 | return; | |
153 | ||
154 | error: | |
155 | dev->stats.rx_errors++; | |
156 | kfree_skb(skb); | |
157 | } | |
158 | ||
159 | static void l2tp_eth_delete(struct l2tp_session *session) | |
160 | { | |
161 | struct l2tp_eth_sess *spriv; | |
162 | struct net_device *dev; | |
163 | ||
164 | if (session) { | |
165 | spriv = l2tp_session_priv(session); | |
166 | dev = spriv->dev; | |
167 | if (dev) { | |
168 | unregister_netdev(dev); | |
169 | spriv->dev = NULL; | |
170 | } | |
171 | } | |
172 | } | |
173 | ||
f66ef2d0 | 174 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
175 | static void l2tp_eth_show(struct seq_file *m, void *arg) |
176 | { | |
177 | struct l2tp_session *session = arg; | |
178 | struct l2tp_eth_sess *spriv = l2tp_session_priv(session); | |
179 | struct net_device *dev = spriv->dev; | |
180 | ||
181 | seq_printf(m, " interface %s\n", dev->name); | |
182 | } | |
183 | #endif | |
184 | ||
d9e31d17 JC |
185 | static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) |
186 | { | |
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; | |
195 | ||
196 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
197 | if (!tunnel) { | |
198 | rc = -ENODEV; | |
199 | goto out; | |
200 | } | |
201 | ||
202 | session = l2tp_session_find(net, tunnel, session_id); | |
203 | if (session) { | |
204 | rc = -EEXIST; | |
205 | goto out; | |
206 | } | |
207 | ||
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; | |
214 | } | |
215 | strlcpy(name, cfg->ifname, IFNAMSIZ); | |
216 | } else | |
217 | strcpy(name, L2TP_ETH_DEV_NAME); | |
218 | ||
219 | session = l2tp_session_create(sizeof(*spriv), tunnel, session_id, | |
220 | peer_session_id, cfg); | |
221 | if (!session) { | |
222 | rc = -ENOMEM; | |
223 | goto out; | |
224 | } | |
225 | ||
226 | dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup); | |
227 | if (!dev) { | |
228 | rc = -ENOMEM; | |
229 | goto out_del_session; | |
230 | } | |
231 | ||
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; | |
237 | ||
238 | priv = netdev_priv(dev); | |
239 | priv->dev = dev; | |
240 | priv->session = session; | |
241 | INIT_LIST_HEAD(&priv->list); | |
242 | ||
243 | priv->tunnel_sock = tunnel->sock; | |
244 | session->recv_skb = l2tp_eth_dev_recv; | |
245 | session->session_close = l2tp_eth_delete; | |
f66ef2d0 | 246 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
247 | session->show = l2tp_eth_show; |
248 | #endif | |
d9e31d17 JC |
249 | |
250 | spriv = l2tp_session_priv(session); | |
251 | spriv->dev = dev; | |
252 | ||
253 | rc = register_netdev(dev); | |
254 | if (rc < 0) | |
255 | goto out_del_dev; | |
256 | ||
257 | /* Must be done after register_netdev() */ | |
258 | strlcpy(session->ifname, dev->name, IFNAMSIZ); | |
259 | ||
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); | |
265 | ||
266 | return 0; | |
267 | ||
268 | out_del_dev: | |
269 | free_netdev(dev); | |
270 | out_del_session: | |
271 | l2tp_session_delete(session); | |
272 | out: | |
273 | return rc; | |
274 | } | |
275 | ||
276 | static __net_init int l2tp_eth_init_net(struct net *net) | |
277 | { | |
3a737028 | 278 | struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id); |
d9e31d17 JC |
279 | |
280 | INIT_LIST_HEAD(&pn->l2tp_eth_dev_list); | |
281 | spin_lock_init(&pn->l2tp_eth_lock); | |
282 | ||
d9e31d17 | 283 | return 0; |
d9e31d17 JC |
284 | } |
285 | ||
286 | static __net_initdata struct pernet_operations l2tp_eth_net_ops = { | |
287 | .init = l2tp_eth_init_net, | |
d9e31d17 JC |
288 | .id = &l2tp_eth_net_id, |
289 | .size = sizeof(struct l2tp_eth_net), | |
290 | }; | |
291 | ||
292 | ||
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, | |
296 | }; | |
297 | ||
298 | ||
299 | static int __init l2tp_eth_init(void) | |
300 | { | |
301 | int err = 0; | |
302 | ||
303 | err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops); | |
304 | if (err) | |
305 | goto out; | |
306 | ||
307 | err = register_pernet_device(&l2tp_eth_net_ops); | |
308 | if (err) | |
309 | goto out_unreg; | |
310 | ||
311 | printk(KERN_INFO "L2TP ethernet pseudowire support (L2TPv3)\n"); | |
312 | ||
313 | return 0; | |
314 | ||
315 | out_unreg: | |
316 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); | |
317 | out: | |
318 | return err; | |
319 | } | |
320 | ||
321 | static void __exit l2tp_eth_exit(void) | |
322 | { | |
323 | unregister_pernet_device(&l2tp_eth_net_ops); | |
324 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); | |
325 | } | |
326 | ||
327 | module_init(l2tp_eth_init); | |
328 | module_exit(l2tp_eth_exit); | |
329 | ||
330 | MODULE_LICENSE("GPL"); | |
331 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
332 | MODULE_DESCRIPTION("L2TP ethernet pseudowire driver"); | |
333 | MODULE_VERSION("1.0"); |