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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 | ||
a4ca44fa JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
d9e31d17 JC |
14 | #include <linux/module.h> |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/socket.h> | |
17 | #include <linux/hash.h> | |
18 | #include <linux/l2tp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <net/sock.h> | |
23 | #include <net/ip.h> | |
24 | #include <net/icmp.h> | |
25 | #include <net/udp.h> | |
26 | #include <net/inet_common.h> | |
27 | #include <net/inet_hashtables.h> | |
28 | #include <net/tcp_states.h> | |
29 | #include <net/protocol.h> | |
30 | #include <net/xfrm.h> | |
31 | #include <net/net_namespace.h> | |
32 | #include <net/netns/generic.h> | |
33 | ||
34 | #include "l2tp_core.h" | |
35 | ||
36 | /* Default device name. May be overridden by name specified by user */ | |
37 | #define L2TP_ETH_DEV_NAME "l2tpeth%d" | |
38 | ||
39 | /* via netdev_priv() */ | |
40 | struct l2tp_eth { | |
41 | struct net_device *dev; | |
42 | struct sock *tunnel_sock; | |
43 | struct l2tp_session *session; | |
44 | struct list_head list; | |
a2842a1e ED |
45 | atomic_long_t tx_bytes; |
46 | atomic_long_t tx_packets; | |
47 | atomic_long_t rx_bytes; | |
48 | atomic_long_t rx_packets; | |
49 | atomic_long_t rx_errors; | |
d9e31d17 JC |
50 | }; |
51 | ||
52 | /* via l2tp_session_priv() */ | |
53 | struct l2tp_eth_sess { | |
54 | struct net_device *dev; | |
55 | }; | |
56 | ||
57 | /* per-net private data for this module */ | |
58 | static unsigned int l2tp_eth_net_id; | |
59 | struct l2tp_eth_net { | |
60 | struct list_head l2tp_eth_dev_list; | |
61 | spinlock_t l2tp_eth_lock; | |
62 | }; | |
63 | ||
64 | static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net) | |
65 | { | |
66 | return net_generic(net, l2tp_eth_net_id); | |
67 | } | |
68 | ||
69 | static int l2tp_eth_dev_init(struct net_device *dev) | |
70 | { | |
71 | struct l2tp_eth *priv = netdev_priv(dev); | |
72 | ||
73 | priv->dev = dev; | |
f2cedb63 | 74 | eth_hw_addr_random(dev); |
d9e31d17 JC |
75 | memset(&dev->broadcast[0], 0xff, 6); |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static void l2tp_eth_dev_uninit(struct net_device *dev) | |
81 | { | |
82 | struct l2tp_eth *priv = netdev_priv(dev); | |
83 | struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev)); | |
84 | ||
85 | spin_lock(&pn->l2tp_eth_lock); | |
86 | list_del_init(&priv->list); | |
87 | spin_unlock(&pn->l2tp_eth_lock); | |
88 | dev_put(dev); | |
89 | } | |
90 | ||
91 | static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
92 | { | |
93 | struct l2tp_eth *priv = netdev_priv(dev); | |
94 | struct l2tp_session *session = priv->session; | |
95 | ||
a2842a1e ED |
96 | atomic_long_add(skb->len, &priv->tx_bytes); |
97 | atomic_long_inc(&priv->tx_packets); | |
d9e31d17 | 98 | |
aa214de0 ED |
99 | l2tp_xmit_skb(session, skb, session->hdr_len); |
100 | ||
101 | return NETDEV_TX_OK; | |
d9e31d17 JC |
102 | } |
103 | ||
a2842a1e ED |
104 | static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev, |
105 | struct rtnl_link_stats64 *stats) | |
106 | { | |
107 | struct l2tp_eth *priv = netdev_priv(dev); | |
108 | ||
109 | stats->tx_bytes = atomic_long_read(&priv->tx_bytes); | |
110 | stats->tx_packets = atomic_long_read(&priv->tx_packets); | |
111 | stats->rx_bytes = atomic_long_read(&priv->rx_bytes); | |
112 | stats->rx_packets = atomic_long_read(&priv->rx_packets); | |
113 | stats->rx_errors = atomic_long_read(&priv->rx_errors); | |
114 | return stats; | |
115 | } | |
116 | ||
117 | ||
d9e31d17 JC |
118 | static struct net_device_ops l2tp_eth_netdev_ops = { |
119 | .ndo_init = l2tp_eth_dev_init, | |
120 | .ndo_uninit = l2tp_eth_dev_uninit, | |
121 | .ndo_start_xmit = l2tp_eth_dev_xmit, | |
a2842a1e | 122 | .ndo_get_stats64 = l2tp_eth_get_stats64, |
d9e31d17 JC |
123 | }; |
124 | ||
125 | static void l2tp_eth_dev_setup(struct net_device *dev) | |
126 | { | |
127 | ether_setup(dev); | |
a2842a1e ED |
128 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
129 | dev->features |= NETIF_F_LLTX; | |
d9e31d17 JC |
130 | dev->netdev_ops = &l2tp_eth_netdev_ops; |
131 | dev->destructor = free_netdev; | |
132 | } | |
133 | ||
134 | static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
135 | { | |
136 | struct l2tp_eth_sess *spriv = l2tp_session_priv(session); | |
137 | struct net_device *dev = spriv->dev; | |
a2842a1e | 138 | struct l2tp_eth *priv = netdev_priv(dev); |
d9e31d17 JC |
139 | |
140 | if (session->debug & L2TP_MSG_DATA) { | |
141 | unsigned int length; | |
d9e31d17 JC |
142 | |
143 | length = min(32u, skb->len); | |
144 | if (!pskb_may_pull(skb, length)) | |
145 | goto error; | |
146 | ||
a4ca44fa | 147 | pr_debug("%s: eth recv\n", session->name); |
a2842a1e | 148 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length); |
d9e31d17 JC |
149 | } |
150 | ||
bfc960a8 | 151 | if (!pskb_may_pull(skb, sizeof(ETH_HLEN))) |
d9e31d17 JC |
152 | goto error; |
153 | ||
154 | secpath_reset(skb); | |
155 | ||
156 | /* checksums verified by L2TP */ | |
157 | skb->ip_summed = CHECKSUM_NONE; | |
158 | ||
159 | skb_dst_drop(skb); | |
160 | nf_reset(skb); | |
161 | ||
162 | if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) { | |
a2842a1e ED |
163 | atomic_long_inc(&priv->rx_packets); |
164 | atomic_long_add(data_len, &priv->rx_bytes); | |
165 | } else { | |
166 | atomic_long_inc(&priv->rx_errors); | |
167 | } | |
d9e31d17 JC |
168 | return; |
169 | ||
170 | error: | |
a2842a1e | 171 | atomic_long_inc(&priv->rx_errors); |
d9e31d17 JC |
172 | kfree_skb(skb); |
173 | } | |
174 | ||
175 | static void l2tp_eth_delete(struct l2tp_session *session) | |
176 | { | |
177 | struct l2tp_eth_sess *spriv; | |
178 | struct net_device *dev; | |
179 | ||
180 | if (session) { | |
181 | spriv = l2tp_session_priv(session); | |
182 | dev = spriv->dev; | |
183 | if (dev) { | |
184 | unregister_netdev(dev); | |
185 | spriv->dev = NULL; | |
a06998b8 | 186 | module_put(THIS_MODULE); |
d9e31d17 JC |
187 | } |
188 | } | |
189 | } | |
190 | ||
f66ef2d0 | 191 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
192 | static void l2tp_eth_show(struct seq_file *m, void *arg) |
193 | { | |
194 | struct l2tp_session *session = arg; | |
195 | struct l2tp_eth_sess *spriv = l2tp_session_priv(session); | |
196 | struct net_device *dev = spriv->dev; | |
197 | ||
198 | seq_printf(m, " interface %s\n", dev->name); | |
199 | } | |
200 | #endif | |
201 | ||
d9e31d17 JC |
202 | static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) |
203 | { | |
204 | struct net_device *dev; | |
205 | char name[IFNAMSIZ]; | |
206 | struct l2tp_tunnel *tunnel; | |
207 | struct l2tp_session *session; | |
208 | struct l2tp_eth *priv; | |
209 | struct l2tp_eth_sess *spriv; | |
210 | int rc; | |
211 | struct l2tp_eth_net *pn; | |
212 | ||
213 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
214 | if (!tunnel) { | |
215 | rc = -ENODEV; | |
216 | goto out; | |
217 | } | |
218 | ||
219 | session = l2tp_session_find(net, tunnel, session_id); | |
220 | if (session) { | |
221 | rc = -EEXIST; | |
222 | goto out; | |
223 | } | |
224 | ||
225 | if (cfg->ifname) { | |
226 | dev = dev_get_by_name(net, cfg->ifname); | |
227 | if (dev) { | |
228 | dev_put(dev); | |
229 | rc = -EEXIST; | |
230 | goto out; | |
231 | } | |
232 | strlcpy(name, cfg->ifname, IFNAMSIZ); | |
233 | } else | |
234 | strcpy(name, L2TP_ETH_DEV_NAME); | |
235 | ||
236 | session = l2tp_session_create(sizeof(*spriv), tunnel, session_id, | |
237 | peer_session_id, cfg); | |
238 | if (!session) { | |
239 | rc = -ENOMEM; | |
240 | goto out; | |
241 | } | |
242 | ||
243 | dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup); | |
244 | if (!dev) { | |
245 | rc = -ENOMEM; | |
246 | goto out_del_session; | |
247 | } | |
248 | ||
249 | dev_net_set(dev, net); | |
250 | if (session->mtu == 0) | |
251 | session->mtu = dev->mtu - session->hdr_len; | |
252 | dev->mtu = session->mtu; | |
253 | dev->needed_headroom += session->hdr_len; | |
254 | ||
255 | priv = netdev_priv(dev); | |
256 | priv->dev = dev; | |
257 | priv->session = session; | |
258 | INIT_LIST_HEAD(&priv->list); | |
259 | ||
260 | priv->tunnel_sock = tunnel->sock; | |
261 | session->recv_skb = l2tp_eth_dev_recv; | |
262 | session->session_close = l2tp_eth_delete; | |
f66ef2d0 | 263 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
0ad66140 JC |
264 | session->show = l2tp_eth_show; |
265 | #endif | |
d9e31d17 JC |
266 | |
267 | spriv = l2tp_session_priv(session); | |
268 | spriv->dev = dev; | |
269 | ||
270 | rc = register_netdev(dev); | |
271 | if (rc < 0) | |
272 | goto out_del_dev; | |
273 | ||
a06998b8 | 274 | __module_get(THIS_MODULE); |
d9e31d17 JC |
275 | /* Must be done after register_netdev() */ |
276 | strlcpy(session->ifname, dev->name, IFNAMSIZ); | |
277 | ||
278 | dev_hold(dev); | |
279 | pn = l2tp_eth_pernet(dev_net(dev)); | |
280 | spin_lock(&pn->l2tp_eth_lock); | |
281 | list_add(&priv->list, &pn->l2tp_eth_dev_list); | |
282 | spin_unlock(&pn->l2tp_eth_lock); | |
283 | ||
284 | return 0; | |
285 | ||
286 | out_del_dev: | |
287 | free_netdev(dev); | |
288 | out_del_session: | |
289 | l2tp_session_delete(session); | |
290 | out: | |
291 | return rc; | |
292 | } | |
293 | ||
294 | static __net_init int l2tp_eth_init_net(struct net *net) | |
295 | { | |
3a737028 | 296 | struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id); |
d9e31d17 JC |
297 | |
298 | INIT_LIST_HEAD(&pn->l2tp_eth_dev_list); | |
299 | spin_lock_init(&pn->l2tp_eth_lock); | |
300 | ||
d9e31d17 | 301 | return 0; |
d9e31d17 JC |
302 | } |
303 | ||
8aa525a9 | 304 | static struct pernet_operations l2tp_eth_net_ops = { |
d9e31d17 | 305 | .init = l2tp_eth_init_net, |
d9e31d17 JC |
306 | .id = &l2tp_eth_net_id, |
307 | .size = sizeof(struct l2tp_eth_net), | |
308 | }; | |
309 | ||
310 | ||
311 | static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = { | |
312 | .session_create = l2tp_eth_create, | |
313 | .session_delete = l2tp_session_delete, | |
314 | }; | |
315 | ||
316 | ||
317 | static int __init l2tp_eth_init(void) | |
318 | { | |
319 | int err = 0; | |
320 | ||
321 | err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops); | |
322 | if (err) | |
323 | goto out; | |
324 | ||
325 | err = register_pernet_device(&l2tp_eth_net_ops); | |
326 | if (err) | |
327 | goto out_unreg; | |
328 | ||
a4ca44fa | 329 | pr_info("L2TP ethernet pseudowire support (L2TPv3)\n"); |
d9e31d17 JC |
330 | |
331 | return 0; | |
332 | ||
333 | out_unreg: | |
334 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); | |
335 | out: | |
336 | return err; | |
337 | } | |
338 | ||
339 | static void __exit l2tp_eth_exit(void) | |
340 | { | |
341 | unregister_pernet_device(&l2tp_eth_net_ops); | |
342 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); | |
343 | } | |
344 | ||
345 | module_init(l2tp_eth_init); | |
346 | module_exit(l2tp_eth_exit); | |
347 | ||
348 | MODULE_LICENSE("GPL"); | |
349 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
350 | MODULE_DESCRIPTION("L2TP ethernet pseudowire driver"); | |
351 | MODULE_VERSION("1.0"); |