blob: f9ee74deeac26f5469271a0800669cc82ffddc63 [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
Joe Perchesa4ca44f2012-05-16 09:55:56 +000012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
James Chapmand9e31d12010-04-02 06:19:26 +000014#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() */
40struct l2tp_eth {
41 struct net_device *dev;
42 struct sock *tunnel_sock;
43 struct l2tp_session *session;
44 struct list_head list;
Eric Dumazeta2842a12012-06-25 05:35:45 +000045 atomic_long_t tx_bytes;
46 atomic_long_t tx_packets;
Eric Dumazetb8c84302012-06-28 20:15:13 +000047 atomic_long_t tx_dropped;
Eric Dumazeta2842a12012-06-25 05:35:45 +000048 atomic_long_t rx_bytes;
49 atomic_long_t rx_packets;
50 atomic_long_t rx_errors;
James Chapmand9e31d12010-04-02 06:19:26 +000051};
52
53/* via l2tp_session_priv() */
54struct l2tp_eth_sess {
55 struct net_device *dev;
56};
57
58/* per-net private data for this module */
59static unsigned int l2tp_eth_net_id;
60struct l2tp_eth_net {
61 struct list_head l2tp_eth_dev_list;
62 spinlock_t l2tp_eth_lock;
63};
64
65static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
66{
67 return net_generic(net, l2tp_eth_net_id);
68}
69
70static int l2tp_eth_dev_init(struct net_device *dev)
71{
72 struct l2tp_eth *priv = netdev_priv(dev);
73
74 priv->dev = dev;
Danny Kukawkaf2cedb62012-02-15 06:45:39 +000075 eth_hw_addr_random(dev);
James Chapmand9e31d12010-04-02 06:19:26 +000076 memset(&dev->broadcast[0], 0xff, 6);
77
78 return 0;
79}
80
81static void l2tp_eth_dev_uninit(struct net_device *dev)
82{
83 struct l2tp_eth *priv = netdev_priv(dev);
84 struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
85
86 spin_lock(&pn->l2tp_eth_lock);
87 list_del_init(&priv->list);
88 spin_unlock(&pn->l2tp_eth_lock);
89 dev_put(dev);
90}
91
92static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
93{
94 struct l2tp_eth *priv = netdev_priv(dev);
95 struct l2tp_session *session = priv->session;
Eric Dumazetb8c84302012-06-28 20:15:13 +000096 unsigned int len = skb->len;
97 int ret = l2tp_xmit_skb(session, skb, session->hdr_len);
James Chapmand9e31d12010-04-02 06:19:26 +000098
Eric Dumazetb8c84302012-06-28 20:15:13 +000099 if (likely(ret == NET_XMIT_SUCCESS)) {
100 atomic_long_add(len, &priv->tx_bytes);
101 atomic_long_inc(&priv->tx_packets);
102 } else {
103 atomic_long_inc(&priv->tx_dropped);
104 }
Eric Dumazetaa214de02012-06-25 00:45:14 +0000105 return NETDEV_TX_OK;
James Chapmand9e31d12010-04-02 06:19:26 +0000106}
107
Eric Dumazeta2842a12012-06-25 05:35:45 +0000108static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev,
109 struct rtnl_link_stats64 *stats)
110{
111 struct l2tp_eth *priv = netdev_priv(dev);
112
113 stats->tx_bytes = atomic_long_read(&priv->tx_bytes);
114 stats->tx_packets = atomic_long_read(&priv->tx_packets);
Eric Dumazetb8c84302012-06-28 20:15:13 +0000115 stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
Eric Dumazeta2842a12012-06-25 05:35:45 +0000116 stats->rx_bytes = atomic_long_read(&priv->rx_bytes);
117 stats->rx_packets = atomic_long_read(&priv->rx_packets);
118 stats->rx_errors = atomic_long_read(&priv->rx_errors);
119 return stats;
120}
121
122
James Chapmand9e31d12010-04-02 06:19:26 +0000123static struct net_device_ops l2tp_eth_netdev_ops = {
124 .ndo_init = l2tp_eth_dev_init,
125 .ndo_uninit = l2tp_eth_dev_uninit,
126 .ndo_start_xmit = l2tp_eth_dev_xmit,
Eric Dumazeta2842a12012-06-25 05:35:45 +0000127 .ndo_get_stats64 = l2tp_eth_get_stats64,
James Chapmand9e31d12010-04-02 06:19:26 +0000128};
129
130static void l2tp_eth_dev_setup(struct net_device *dev)
131{
132 ether_setup(dev);
Eric Dumazeta2842a12012-06-25 05:35:45 +0000133 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
134 dev->features |= NETIF_F_LLTX;
James Chapmand9e31d12010-04-02 06:19:26 +0000135 dev->netdev_ops = &l2tp_eth_netdev_ops;
136 dev->destructor = free_netdev;
137}
138
139static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
140{
141 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
142 struct net_device *dev = spriv->dev;
Eric Dumazeta2842a12012-06-25 05:35:45 +0000143 struct l2tp_eth *priv = netdev_priv(dev);
James Chapmand9e31d12010-04-02 06:19:26 +0000144
145 if (session->debug & L2TP_MSG_DATA) {
146 unsigned int length;
James Chapmand9e31d12010-04-02 06:19:26 +0000147
148 length = min(32u, skb->len);
149 if (!pskb_may_pull(skb, length))
150 goto error;
151
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000152 pr_debug("%s: eth recv\n", session->name);
Eric Dumazeta2842a12012-06-25 05:35:45 +0000153 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
James Chapmand9e31d12010-04-02 06:19:26 +0000154 }
155
Eric Dumazetbfc960a2010-08-25 23:44:35 +0000156 if (!pskb_may_pull(skb, sizeof(ETH_HLEN)))
James Chapmand9e31d12010-04-02 06:19:26 +0000157 goto error;
158
159 secpath_reset(skb);
160
161 /* checksums verified by L2TP */
162 skb->ip_summed = CHECKSUM_NONE;
163
164 skb_dst_drop(skb);
165 nf_reset(skb);
166
167 if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
Eric Dumazeta2842a12012-06-25 05:35:45 +0000168 atomic_long_inc(&priv->rx_packets);
169 atomic_long_add(data_len, &priv->rx_bytes);
170 } else {
171 atomic_long_inc(&priv->rx_errors);
172 }
James Chapmand9e31d12010-04-02 06:19:26 +0000173 return;
174
175error:
Eric Dumazeta2842a12012-06-25 05:35:45 +0000176 atomic_long_inc(&priv->rx_errors);
James Chapmand9e31d12010-04-02 06:19:26 +0000177 kfree_skb(skb);
178}
179
180static void l2tp_eth_delete(struct l2tp_session *session)
181{
182 struct l2tp_eth_sess *spriv;
183 struct net_device *dev;
184
185 if (session) {
186 spriv = l2tp_session_priv(session);
187 dev = spriv->dev;
188 if (dev) {
189 unregister_netdev(dev);
190 spriv->dev = NULL;
Eric Dumazeta06998b2012-06-07 00:07:20 +0000191 module_put(THIS_MODULE);
James Chapmand9e31d12010-04-02 06:19:26 +0000192 }
193 }
194}
195
David S. Millerf66ef2d2010-04-03 15:01:37 -0700196#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
James Chapman0ad66142010-04-02 06:19:33 +0000197static void l2tp_eth_show(struct seq_file *m, void *arg)
198{
199 struct l2tp_session *session = arg;
200 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
201 struct net_device *dev = spriv->dev;
202
203 seq_printf(m, " interface %s\n", dev->name);
204}
205#endif
206
James Chapmand9e31d12010-04-02 06:19:26 +0000207static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
208{
209 struct net_device *dev;
210 char name[IFNAMSIZ];
211 struct l2tp_tunnel *tunnel;
212 struct l2tp_session *session;
213 struct l2tp_eth *priv;
214 struct l2tp_eth_sess *spriv;
215 int rc;
216 struct l2tp_eth_net *pn;
217
218 tunnel = l2tp_tunnel_find(net, tunnel_id);
219 if (!tunnel) {
220 rc = -ENODEV;
221 goto out;
222 }
223
224 session = l2tp_session_find(net, tunnel, session_id);
225 if (session) {
226 rc = -EEXIST;
227 goto out;
228 }
229
230 if (cfg->ifname) {
231 dev = dev_get_by_name(net, cfg->ifname);
232 if (dev) {
233 dev_put(dev);
234 rc = -EEXIST;
235 goto out;
236 }
237 strlcpy(name, cfg->ifname, IFNAMSIZ);
238 } else
239 strcpy(name, L2TP_ETH_DEV_NAME);
240
241 session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
242 peer_session_id, cfg);
243 if (!session) {
244 rc = -ENOMEM;
245 goto out;
246 }
247
248 dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
249 if (!dev) {
250 rc = -ENOMEM;
251 goto out_del_session;
252 }
253
254 dev_net_set(dev, net);
255 if (session->mtu == 0)
256 session->mtu = dev->mtu - session->hdr_len;
257 dev->mtu = session->mtu;
258 dev->needed_headroom += session->hdr_len;
259
260 priv = netdev_priv(dev);
261 priv->dev = dev;
262 priv->session = session;
263 INIT_LIST_HEAD(&priv->list);
264
265 priv->tunnel_sock = tunnel->sock;
266 session->recv_skb = l2tp_eth_dev_recv;
267 session->session_close = l2tp_eth_delete;
David S. Millerf66ef2d2010-04-03 15:01:37 -0700268#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
James Chapman0ad66142010-04-02 06:19:33 +0000269 session->show = l2tp_eth_show;
270#endif
James Chapmand9e31d12010-04-02 06:19:26 +0000271
272 spriv = l2tp_session_priv(session);
273 spriv->dev = dev;
274
275 rc = register_netdev(dev);
276 if (rc < 0)
277 goto out_del_dev;
278
Eric Dumazeta06998b2012-06-07 00:07:20 +0000279 __module_get(THIS_MODULE);
James Chapmand9e31d12010-04-02 06:19:26 +0000280 /* Must be done after register_netdev() */
281 strlcpy(session->ifname, dev->name, IFNAMSIZ);
282
283 dev_hold(dev);
284 pn = l2tp_eth_pernet(dev_net(dev));
285 spin_lock(&pn->l2tp_eth_lock);
286 list_add(&priv->list, &pn->l2tp_eth_dev_list);
287 spin_unlock(&pn->l2tp_eth_lock);
288
289 return 0;
290
291out_del_dev:
292 free_netdev(dev);
293out_del_session:
294 l2tp_session_delete(session);
295out:
296 return rc;
297}
298
299static __net_init int l2tp_eth_init_net(struct net *net)
300{
Jiri Pirko3a737022010-04-23 01:01:52 +0000301 struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
James Chapmand9e31d12010-04-02 06:19:26 +0000302
303 INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
304 spin_lock_init(&pn->l2tp_eth_lock);
305
James Chapmand9e31d12010-04-02 06:19:26 +0000306 return 0;
James Chapmand9e31d12010-04-02 06:19:26 +0000307}
308
James Chapman8aa525a2011-03-21 18:10:25 -0700309static struct pernet_operations l2tp_eth_net_ops = {
James Chapmand9e31d12010-04-02 06:19:26 +0000310 .init = l2tp_eth_init_net,
James Chapmand9e31d12010-04-02 06:19:26 +0000311 .id = &l2tp_eth_net_id,
312 .size = sizeof(struct l2tp_eth_net),
313};
314
315
316static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
317 .session_create = l2tp_eth_create,
318 .session_delete = l2tp_session_delete,
319};
320
321
322static int __init l2tp_eth_init(void)
323{
324 int err = 0;
325
326 err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
327 if (err)
328 goto out;
329
330 err = register_pernet_device(&l2tp_eth_net_ops);
331 if (err)
332 goto out_unreg;
333
Joe Perchesa4ca44f2012-05-16 09:55:56 +0000334 pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
James Chapmand9e31d12010-04-02 06:19:26 +0000335
336 return 0;
337
338out_unreg:
339 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
340out:
341 return err;
342}
343
344static void __exit l2tp_eth_exit(void)
345{
346 unregister_pernet_device(&l2tp_eth_net_ops);
347 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
348}
349
350module_init(l2tp_eth_init);
351module_exit(l2tp_eth_exit);
352
353MODULE_LICENSE("GPL");
354MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
355MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
356MODULE_VERSION("1.0");