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;
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;
53 /* via l2tp_session_priv() */
54 struct l2tp_eth_sess {
55 struct net_device *dev;
58 /* per-net private data for this module */
59 static unsigned int l2tp_eth_net_id;
61 struct list_head l2tp_eth_dev_list;
62 spinlock_t l2tp_eth_lock;
65 static inline struct l2tp_eth_net *l2tp_eth_pernet(struct net *net)
67 return net_generic(net, l2tp_eth_net_id);
70 static int l2tp_eth_dev_init(struct net_device *dev)
72 struct l2tp_eth *priv = netdev_priv(dev);
75 eth_hw_addr_random(dev);
76 eth_broadcast_addr(dev->broadcast);
77 netdev_lockdep_set_classes(dev);
82 static void l2tp_eth_dev_uninit(struct net_device *dev)
84 struct l2tp_eth *priv = netdev_priv(dev);
85 struct l2tp_eth_net *pn = l2tp_eth_pernet(dev_net(dev));
87 spin_lock(&pn->l2tp_eth_lock);
88 list_del_init(&priv->list);
89 spin_unlock(&pn->l2tp_eth_lock);
93 static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
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);
100 if (likely(ret == NET_XMIT_SUCCESS)) {
101 atomic_long_add(len, &priv->tx_bytes);
102 atomic_long_inc(&priv->tx_packets);
104 atomic_long_inc(&priv->tx_dropped);
109 static void l2tp_eth_get_stats64(struct net_device *dev,
110 struct rtnl_link_stats64 *stats)
112 struct l2tp_eth *priv = netdev_priv(dev);
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);
122 static const struct net_device_ops l2tp_eth_netdev_ops = {
123 .ndo_init = l2tp_eth_dev_init,
124 .ndo_uninit = l2tp_eth_dev_uninit,
125 .ndo_start_xmit = l2tp_eth_dev_xmit,
126 .ndo_get_stats64 = l2tp_eth_get_stats64,
127 .ndo_set_mac_address = eth_mac_addr,
130 static void l2tp_eth_dev_setup(struct net_device *dev)
133 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
134 dev->features |= NETIF_F_LLTX;
135 dev->netdev_ops = &l2tp_eth_netdev_ops;
136 dev->destructor = free_netdev;
139 static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len)
141 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
142 struct net_device *dev = spriv->dev;
143 struct l2tp_eth *priv = netdev_priv(dev);
145 if (session->debug & L2TP_MSG_DATA) {
148 length = min(32u, skb->len);
149 if (!pskb_may_pull(skb, length))
152 pr_debug("%s: eth recv\n", session->name);
153 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
156 if (!pskb_may_pull(skb, ETH_HLEN))
161 /* checksums verified by L2TP */
162 skb->ip_summed = CHECKSUM_NONE;
167 if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
168 atomic_long_inc(&priv->rx_packets);
169 atomic_long_add(data_len, &priv->rx_bytes);
171 atomic_long_inc(&priv->rx_errors);
176 atomic_long_inc(&priv->rx_errors);
180 static void l2tp_eth_delete(struct l2tp_session *session)
182 struct l2tp_eth_sess *spriv;
183 struct net_device *dev;
186 spriv = l2tp_session_priv(session);
189 unregister_netdev(dev);
191 module_put(THIS_MODULE);
196 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
197 static void l2tp_eth_show(struct seq_file *m, void *arg)
199 struct l2tp_session *session = arg;
200 struct l2tp_eth_sess *spriv = l2tp_session_priv(session);
201 struct net_device *dev = spriv->dev;
203 seq_printf(m, " interface %s\n", dev->name);
207 static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg)
209 struct net_device *dev;
211 struct l2tp_tunnel *tunnel;
212 struct l2tp_session *session;
213 struct l2tp_eth *priv;
214 struct l2tp_eth_sess *spriv;
216 struct l2tp_eth_net *pn;
218 tunnel = l2tp_tunnel_find(net, tunnel_id);
224 session = l2tp_session_find(net, tunnel, session_id);
231 dev = dev_get_by_name(net, cfg->ifname);
237 strlcpy(name, cfg->ifname, IFNAMSIZ);
239 strcpy(name, L2TP_ETH_DEV_NAME);
241 session = l2tp_session_create(sizeof(*spriv), tunnel, session_id,
242 peer_session_id, cfg);
248 dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
252 goto out_del_session;
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;
261 dev->max_mtu = ETH_MAX_MTU;
263 priv = netdev_priv(dev);
265 priv->session = session;
266 INIT_LIST_HEAD(&priv->list);
268 priv->tunnel_sock = tunnel->sock;
269 session->recv_skb = l2tp_eth_dev_recv;
270 session->session_close = l2tp_eth_delete;
271 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
272 session->show = l2tp_eth_show;
275 spriv = l2tp_session_priv(session);
278 rc = register_netdev(dev);
282 __module_get(THIS_MODULE);
283 /* Must be done after register_netdev() */
284 strlcpy(session->ifname, dev->name, IFNAMSIZ);
287 pn = l2tp_eth_pernet(dev_net(dev));
288 spin_lock(&pn->l2tp_eth_lock);
289 list_add(&priv->list, &pn->l2tp_eth_dev_list);
290 spin_unlock(&pn->l2tp_eth_lock);
298 l2tp_session_delete(session);
303 static __net_init int l2tp_eth_init_net(struct net *net)
305 struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
307 INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
308 spin_lock_init(&pn->l2tp_eth_lock);
313 static struct pernet_operations l2tp_eth_net_ops = {
314 .init = l2tp_eth_init_net,
315 .id = &l2tp_eth_net_id,
316 .size = sizeof(struct l2tp_eth_net),
320 static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
321 .session_create = l2tp_eth_create,
322 .session_delete = l2tp_session_delete,
326 static int __init l2tp_eth_init(void)
330 err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
334 err = register_pernet_device(&l2tp_eth_net_ops);
338 pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
343 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
348 static void __exit l2tp_eth_exit(void)
350 unregister_pernet_device(&l2tp_eth_net_ops);
351 l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
354 module_init(l2tp_eth_init);
355 module_exit(l2tp_eth_exit);
357 MODULE_LICENSE("GPL");
358 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
359 MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
360 MODULE_VERSION("1.0");
361 MODULE_ALIAS_L2TP_PWTYPE(5);