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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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | |
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; |
45 | atomic_long_t tx_bytes; |
46 | atomic_long_t tx_packets; |
47 | atomic_long_t tx_dropped; |
48 | atomic_long_t rx_bytes; |
49 | atomic_long_t rx_packets; |
50 | atomic_long_t rx_errors; |
51 | }; |
52 | |
53 | /* via l2tp_session_priv() */ |
54 | struct l2tp_eth_sess { |
55 | struct net_device *dev; |
56 | }; |
57 | |
58 | /* per-net private data for this module */ |
59 | static unsigned int l2tp_eth_net_id; |
60 | struct l2tp_eth_net { |
61 | struct list_head l2tp_eth_dev_list; |
62 | spinlock_t l2tp_eth_lock; |
63 | }; |
64 | |
65 | static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net) |
66 | { |
67 | return net_generic(net, l2tp_eth_net_id); |
68 | } |
69 | |
70 | static struct lock_class_key l2tp_eth_tx_busylock; |
71 | static int l2tp_eth_dev_init(struct net_device *dev) |
72 | { |
73 | struct l2tp_eth *priv = netdev_priv(dev); |
74 | |
75 | priv->dev = dev; |
76 | eth_hw_addr_random(dev); |
77 | memset(&dev->broadcast[0], 0xff, 6); |
78 | dev->qdisc_tx_busylock = &l2tp_eth_tx_busylock; |
79 | return 0; |
80 | } |
81 | |
82 | static void l2tp_eth_dev_uninit(struct net_device *dev) |
83 | { |
84 | struct l2tp_eth *priv = netdev_priv(dev); |
85 | struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev)); |
86 | |
87 | spin_lock(&pn->l2tp_eth_lock); |
88 | list_del_init(&priv->list); |
89 | spin_unlock(&pn->l2tp_eth_lock); |
90 | dev_put(dev); |
91 | } |
92 | |
93 | static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
94 | { |
95 | struct l2tp_eth *priv = netdev_priv(dev); |
96 | struct l2tp_session *session = priv->session; |
97 | unsigned int len = skb->len; |
98 | int ret = l2tp_xmit_skb(session, skb, session->hdr_len); |
99 | |
100 | if (likely(ret == NET_XMIT_SUCCESS)) { |
101 | atomic_long_add(len, &priv->tx_bytes); |
102 | atomic_long_inc(&priv->tx_packets); |
103 | } else { |
104 | atomic_long_inc(&priv->tx_dropped); |
105 | } |
106 | return NETDEV_TX_OK; |
107 | } |
108 | |
109 | static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev, |
110 | struct rtnl_link_stats64 *stats) |
111 | { |
112 | struct l2tp_eth *priv = netdev_priv(dev); |
113 | |
114 | stats->tx_bytes = atomic_long_read(&priv->tx_bytes); |
115 | stats->tx_packets = atomic_long_read(&priv->tx_packets); |
116 | stats->tx_dropped = atomic_long_read(&priv->tx_dropped); |
117 | stats->rx_bytes = atomic_long_read(&priv->rx_bytes); |
118 | stats->rx_packets = atomic_long_read(&priv->rx_packets); |
119 | stats->rx_errors = atomic_long_read(&priv->rx_errors); |
120 | return stats; |
121 | } |
122 | |
123 | |
124 | static struct net_device_ops l2tp_eth_netdev_ops = { |
125 | .ndo_init = l2tp_eth_dev_init, |
126 | .ndo_uninit = l2tp_eth_dev_uninit, |
127 | .ndo_start_xmit = l2tp_eth_dev_xmit, |
128 | .ndo_get_stats64 = l2tp_eth_get_stats64, |
129 | }; |
130 | |
131 | static void l2tp_eth_dev_setup(struct net_device *dev) |
132 | { |
133 | ether_setup(dev); |
134 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
135 | dev->features |= NETIF_F_LLTX; |
136 | dev->netdev_ops = &l2tp_eth_netdev_ops; |
137 | dev->destructor = free_netdev; |
138 | } |
139 | |
140 | static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) |
141 | { |
142 | struct l2tp_eth_sess *spriv = l2tp_session_priv(session); |
143 | struct net_device *dev = spriv->dev; |
144 | struct l2tp_eth *priv = netdev_priv(dev); |
145 | |
146 | if (session->debug & L2TP_MSG_DATA) { |
147 | unsigned int length; |
148 | |
149 | length = min(32u, skb->len); |
150 | if (!pskb_may_pull(skb, length)) |
151 | goto error; |
152 | |
153 | pr_debug("%s: eth recv\n", session->name); |
154 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length); |
155 | } |
156 | |
157 | if (!pskb_may_pull(skb, ETH_HLEN)) |
158 | goto error; |
159 | |
160 | secpath_reset(skb); |
161 | |
162 | /* checksums verified by L2TP */ |
163 | skb->ip_summed = CHECKSUM_NONE; |
164 | |
165 | skb_dst_drop(skb); |
166 | nf_reset(skb); |
167 | |
168 | if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) { |
169 | atomic_long_inc(&priv->rx_packets); |
170 | atomic_long_add(data_len, &priv->rx_bytes); |
171 | } else { |
172 | atomic_long_inc(&priv->rx_errors); |
173 | } |
174 | return; |
175 | |
176 | error: |
177 | atomic_long_inc(&priv->rx_errors); |
178 | kfree_skb(skb); |
179 | } |
180 | |
181 | static void l2tp_eth_delete(struct l2tp_session *session) |
182 | { |
183 | struct l2tp_eth_sess *spriv; |
184 | struct net_device *dev; |
185 | |
186 | if (session) { |
187 | spriv = l2tp_session_priv(session); |
188 | dev = spriv->dev; |
189 | if (dev) { |
190 | unregister_netdev(dev); |
191 | spriv->dev = NULL; |
192 | module_put(THIS_MODULE); |
193 | } |
194 | } |
195 | } |
196 | |
197 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
198 | static void l2tp_eth_show(struct seq_file *m, void *arg) |
199 | { |
200 | struct l2tp_session *session = arg; |
201 | struct l2tp_eth_sess *spriv = l2tp_session_priv(session); |
202 | struct net_device *dev = spriv->dev; |
203 | |
204 | seq_printf(m, " interface %s\n", dev->name); |
205 | } |
206 | #endif |
207 | |
208 | static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) |
209 | { |
210 | struct net_device *dev; |
211 | char name[IFNAMSIZ]; |
212 | struct l2tp_tunnel *tunnel; |
213 | struct l2tp_session *session; |
214 | struct l2tp_eth *priv; |
215 | struct l2tp_eth_sess *spriv; |
216 | int rc; |
217 | struct l2tp_eth_net *pn; |
218 | |
219 | tunnel = l2tp_tunnel_find(net, tunnel_id); |
220 | if (!tunnel) { |
221 | rc = -ENODEV; |
222 | goto out; |
223 | } |
224 | |
225 | session = l2tp_session_find(net, tunnel, session_id); |
226 | if (session) { |
227 | rc = -EEXIST; |
228 | goto out; |
229 | } |
230 | |
231 | if (cfg->ifname) { |
232 | dev = dev_get_by_name(net, cfg->ifname); |
233 | if (dev) { |
234 | dev_put(dev); |
235 | rc = -EEXIST; |
236 | goto out; |
237 | } |
238 | strlcpy(name, cfg->ifname, IFNAMSIZ); |
239 | } else |
240 | strcpy(name, L2TP_ETH_DEV_NAME); |
241 | |
242 | session = l2tp_session_create(sizeof(*spriv), tunnel, session_id, |
243 | peer_session_id, cfg); |
244 | if (!session) { |
245 | rc = -ENOMEM; |
246 | goto out; |
247 | } |
248 | |
249 | dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup); |
250 | if (!dev) { |
251 | rc = -ENOMEM; |
252 | goto out_del_session; |
253 | } |
254 | |
255 | dev_net_set(dev, net); |
256 | if (session->mtu == 0) |
257 | session->mtu = dev->mtu - session->hdr_len; |
258 | dev->mtu = session->mtu; |
259 | dev->needed_headroom += session->hdr_len; |
260 | |
261 | priv = netdev_priv(dev); |
262 | priv->dev = dev; |
263 | priv->session = session; |
264 | INIT_LIST_HEAD(&priv->list); |
265 | |
266 | priv->tunnel_sock = tunnel->sock; |
267 | session->recv_skb = l2tp_eth_dev_recv; |
268 | session->session_close = l2tp_eth_delete; |
269 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
270 | session->show = l2tp_eth_show; |
271 | #endif |
272 | |
273 | spriv = l2tp_session_priv(session); |
274 | spriv->dev = dev; |
275 | |
276 | rc = register_netdev(dev); |
277 | if (rc < 0) |
278 | goto out_del_dev; |
279 | |
280 | __module_get(THIS_MODULE); |
281 | /* Must be done after register_netdev() */ |
282 | strlcpy(session->ifname, dev->name, IFNAMSIZ); |
283 | |
284 | dev_hold(dev); |
285 | pn = l2tp_eth_pernet(dev_net(dev)); |
286 | spin_lock(&pn->l2tp_eth_lock); |
287 | list_add(&priv->list, &pn->l2tp_eth_dev_list); |
288 | spin_unlock(&pn->l2tp_eth_lock); |
289 | |
290 | return 0; |
291 | |
292 | out_del_dev: |
293 | free_netdev(dev); |
294 | spriv->dev = NULL; |
295 | out_del_session: |
296 | l2tp_session_delete(session); |
297 | out: |
298 | return rc; |
299 | } |
300 | |
301 | static __net_init int l2tp_eth_init_net(struct net *net) |
302 | { |
303 | struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id); |
304 | |
305 | INIT_LIST_HEAD(&pn->l2tp_eth_dev_list); |
306 | spin_lock_init(&pn->l2tp_eth_lock); |
307 | |
308 | return 0; |
309 | } |
310 | |
311 | static struct pernet_operations l2tp_eth_net_ops = { |
312 | .init = l2tp_eth_init_net, |
313 | .id = &l2tp_eth_net_id, |
314 | .size = sizeof(struct l2tp_eth_net), |
315 | }; |
316 | |
317 | |
318 | static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = { |
319 | .session_create = l2tp_eth_create, |
320 | .session_delete = l2tp_session_delete, |
321 | }; |
322 | |
323 | |
324 | static int __init l2tp_eth_init(void) |
325 | { |
326 | int err = 0; |
327 | |
328 | err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops); |
329 | if (err) |
330 | goto out; |
331 | |
332 | err = register_pernet_device(&l2tp_eth_net_ops); |
333 | if (err) |
334 | goto out_unreg; |
335 | |
336 | pr_info("L2TP ethernet pseudowire support (L2TPv3)\n"); |
337 | |
338 | return 0; |
339 | |
340 | out_unreg: |
341 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); |
342 | out: |
343 | return err; |
344 | } |
345 | |
346 | static void __exit l2tp_eth_exit(void) |
347 | { |
348 | unregister_pernet_device(&l2tp_eth_net_ops); |
349 | l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH); |
350 | } |
351 | |
352 | module_init(l2tp_eth_init); |
353 | module_exit(l2tp_eth_exit); |
354 | |
355 | MODULE_LICENSE("GPL"); |
356 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
357 | MODULE_DESCRIPTION("L2TP ethernet pseudowire driver"); |
358 | MODULE_VERSION("1.0"); |
359 |
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