2 * L2TPv3 ethernet pseudowire driver
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
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.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
20 #include <linux/etherdevice.h>
21 #include <linux/spinlock.h>
26 #include <net/inet_common.h>
27 #include <net/inet_hashtables.h>
28 #include <net/tcp_states.h>
29 #include <net/protocol.h>
31 #include <net/net_namespace.h>
32 #include <net/netns/generic.h>
34 #include "l2tp_core.h"
36 /* Default device name. May be overridden by name specified by user */
37 #define L2TP_ETH_DEV_NAME "l2tpeth%d"
39 /* via netdev_priv() */
41 struct net_device *dev;
42 struct sock *tunnel_sock;
43 struct l2tp_session *session;
44 struct list_head list;
47 /* via l2tp_session_priv() */
48 struct l2tp_eth_sess {
49 struct net_device *dev;
52 /* per-net private data for this module */
53 static unsigned int l2tp_eth_net_id;
55 struct list_head l2tp_eth_dev_list;
56 spinlock_t l2tp_eth_lock;
59 static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
61 return net_generic(net, l2tp_eth_net_id);
64 static int l2tp_eth_dev_init(struct net_device *dev)
66 struct l2tp_eth *priv = netdev_priv(dev);
69 eth_hw_addr_random(dev);
70 memset(&dev->broadcast[0], 0xff, 6);
75 static void l2tp_eth_dev_uninit(struct net_device *dev)
77 struct l2tp_eth *priv = netdev_priv(dev);
78 struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
80 spin_lock(&pn->l2tp_eth_lock);
81 list_del_init(&priv->list);
82 spin_unlock(&pn->l2tp_eth_lock);
86 static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
88 struct l2tp_eth *priv = netdev_priv(dev);
89 struct l2tp_session *session = priv->session;
91 l2tp_xmit_skb(session, skb, session->hdr_len);
93 dev->stats.tx_bytes += skb->len;
94 dev->stats.tx_packets++;
99 static struct net_device_ops l2tp_eth_netdev_ops = {
100 .ndo_init = l2tp_eth_dev_init,
101 .ndo_uninit = l2tp_eth_dev_uninit,
102 .ndo_start_xmit = l2tp_eth_dev_xmit,
105 static void l2tp_eth_dev_setup(struct net_device *dev)
108 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
109 dev->netdev_ops = &l2tp_eth_netdev_ops;
110 dev->destructor = free_netdev;
113 static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
115 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
116 struct net_device *dev = spriv->dev;
118 if (session->debug & L2TP_MSG_DATA) {
122 length = min(32u, skb->len);
123 if (!pskb_may_pull(skb, length))
126 pr_debug("%s: eth recv\n", session->name);
127 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
130 if (!pskb_may_pull(skb, sizeof(ETH_HLEN)))
135 /* checksums verified by L2TP */
136 skb->ip_summed = CHECKSUM_NONE;
141 if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
142 dev->stats.rx_packets++;
143 dev->stats.rx_bytes += data_len;
145 dev->stats.rx_errors++;
150 dev->stats.rx_errors++;
154 static void l2tp_eth_delete(struct l2tp_session *session)
156 struct l2tp_eth_sess *spriv;
157 struct net_device *dev;
160 spriv = l2tp_session_priv(session);
163 unregister_netdev(dev);
165 module_put(THIS_MODULE);
170 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
171 static void l2tp_eth_show(struct seq_file *m, void *arg)
173 struct l2tp_session *session = arg;
174 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
175 struct net_device *dev = spriv->dev;
177 seq_printf(m, " interface %s\n", dev->name);
181 static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
183 struct net_device *dev;
185 struct l2tp_tunnel *tunnel;
186 struct l2tp_session *session;
187 struct l2tp_eth *priv;
188 struct l2tp_eth_sess *spriv;
190 struct l2tp_eth_net *pn;
192 tunnel = l2tp_tunnel_find(net, tunnel_id);
198 session = l2tp_session_find(net, tunnel, session_id);
205 dev = dev_get_by_name(net, cfg->ifname);
211 strlcpy(name, cfg->ifname, IFNAMSIZ);
213 strcpy(name, L2TP_ETH_DEV_NAME);
215 session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
216 peer_session_id, cfg);
222 dev = alloc_netdev(sizeof(*priv), name, l2tp_eth_dev_setup);
225 goto out_del_session;
228 dev_net_set(dev, net);
229 if (session->mtu == 0)
230 session->mtu = dev->mtu - session->hdr_len;
231 dev->mtu = session->mtu;
232 dev->needed_headroom += session->hdr_len;
234 priv = netdev_priv(dev);
236 priv->session = session;
237 INIT_LIST_HEAD(&priv->list);
239 priv->tunnel_sock = tunnel->sock;
240 session->recv_skb = l2tp_eth_dev_recv;
241 session->session_close = l2tp_eth_delete;
242 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
243 session->show = l2tp_eth_show;
246 spriv = l2tp_session_priv(session);
249 rc = register_netdev(dev);
253 __module_get(THIS_MODULE);
254 /* Must be done after register_netdev() */
255 strlcpy(session->ifname, dev->name, IFNAMSIZ);
258 pn = l2tp_eth_pernet(dev_net(dev));
259 spin_lock(&pn->l2tp_eth_lock);
260 list_add(&priv->list, &pn->l2tp_eth_dev_list);
261 spin_unlock(&pn->l2tp_eth_lock);
268 l2tp_session_delete(session);
273 static __net_init int l2tp_eth_init_net(struct net *net)
275 struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
277 INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
278 spin_lock_init(&pn->l2tp_eth_lock);
283 static struct pernet_operations l2tp_eth_net_ops = {
284 .init = l2tp_eth_init_net,
285 .id = &l2tp_eth_net_id,
286 .size = sizeof(struct l2tp_eth_net),
290 static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
291 .session_create = l2tp_eth_create,
292 .session_delete = l2tp_session_delete,
296 static int __init l2tp_eth_init(void)
300 err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
304 err = register_pernet_device(&l2tp_eth_net_ops);
308 pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
313 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
318 static void __exit l2tp_eth_exit(void)
320 unregister_pernet_device(&l2tp_eth_net_ops);
321 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
324 module_init(l2tp_eth_init);
325 module_exit(l2tp_eth_exit);
327 MODULE_LICENSE("GPL");
328 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
329 MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
330 MODULE_VERSION("1.0");