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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 | |
135 | if (!pskb_may_pull(skb, sizeof(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 | |
155 | error: |
156 | dev->stats.rx_errors++; |
157 | kfree_skb(skb); |
158 | } |
159 | |
160 | static 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 | |
175 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
176 | static 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 | |
186 | static 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; |
247 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
248 | session->show = l2tp_eth_show; |
249 | #endif |
250 | |
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 | |
269 | out_del_dev: |
270 | free_netdev(dev); |
271 | out_del_session: |
272 | l2tp_session_delete(session); |
273 | out: |
274 | return rc; |
275 | } |
276 | |
277 | static __net_init int l2tp_eth_init_net(struct net *net) |
278 | { |
279 | struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id); |
280 | |
281 | INIT_LIST_HEAD(&pn->l2tp_eth_dev_list); |
282 | spin_lock_init(&pn->l2tp_eth_lock); |
283 | |
284 | return 0; |
285 | } |
286 | |
287 | static __net_initdata struct pernet_operations l2tp_eth_net_ops = { |
288 | .init = l2tp_eth_init_net, |
289 | .id = &l2tp_eth_net_id, |
290 | .size = sizeof(struct l2tp_eth_net), |
291 | }; |
292 | |
293 | |
294 | static 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 | |
300 | static 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 | |
316 | out_unreg: |
317 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); |
318 | out: |
319 | return err; |
320 | } |
321 | |
322 | static 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 | |
328 | module_init(l2tp_eth_init); |
329 | module_exit(l2tp_eth_exit); |
330 | |
331 | MODULE_LICENSE("GPL"); |
332 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
333 | MODULE_DESCRIPTION("L2TP ethernet pseudowire driver"); |
334 | MODULE_VERSION("1.0"); |
335 |
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