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Linux/net/l2tp/l2tp_eth.c

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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, NET_NAME_UNKNOWN,
250                            l2tp_eth_dev_setup);
251         if (!dev) {
252                 rc = -ENOMEM;
253                 goto out_del_session;
254         }
255 
256         dev_net_set(dev, net);
257         if (session->mtu == 0)
258                 session->mtu = dev->mtu - session->hdr_len;
259         dev->mtu = session->mtu;
260         dev->needed_headroom += session->hdr_len;
261 
262         priv = netdev_priv(dev);
263         priv->dev = dev;
264         priv->session = session;
265         INIT_LIST_HEAD(&priv->list);
266 
267         priv->tunnel_sock = tunnel->sock;
268         session->recv_skb = l2tp_eth_dev_recv;
269         session->session_close = l2tp_eth_delete;
270 #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
271         session->show = l2tp_eth_show;
272 #endif
273 
274         spriv = l2tp_session_priv(session);
275         spriv->dev = dev;
276 
277         rc = register_netdev(dev);
278         if (rc < 0)
279                 goto out_del_dev;
280 
281         __module_get(THIS_MODULE);
282         /* Must be done after register_netdev() */
283         strlcpy(session->ifname, dev->name, IFNAMSIZ);
284 
285         dev_hold(dev);
286         pn = l2tp_eth_pernet(dev_net(dev));
287         spin_lock(&pn->l2tp_eth_lock);
288         list_add(&priv->list, &pn->l2tp_eth_dev_list);
289         spin_unlock(&pn->l2tp_eth_lock);
290 
291         return 0;
292 
293 out_del_dev:
294         free_netdev(dev);
295         spriv->dev = NULL;
296 out_del_session:
297         l2tp_session_delete(session);
298 out:
299         return rc;
300 }
301 
302 static __net_init int l2tp_eth_init_net(struct net *net)
303 {
304         struct l2tp_eth_net *pn = net_generic(net, l2tp_eth_net_id);
305 
306         INIT_LIST_HEAD(&pn->l2tp_eth_dev_list);
307         spin_lock_init(&pn->l2tp_eth_lock);
308 
309         return 0;
310 }
311 
312 static struct pernet_operations l2tp_eth_net_ops = {
313         .init = l2tp_eth_init_net,
314         .id   = &l2tp_eth_net_id,
315         .size = sizeof(struct l2tp_eth_net),
316 };
317 
318 
319 static const struct l2tp_nl_cmd_ops l2tp_eth_nl_cmd_ops = {
320         .session_create = l2tp_eth_create,
321         .session_delete = l2tp_session_delete,
322 };
323 
324 
325 static int __init l2tp_eth_init(void)
326 {
327         int err = 0;
328 
329         err = l2tp_nl_register_ops(L2TP_PWTYPE_ETH, &l2tp_eth_nl_cmd_ops);
330         if (err)
331                 goto out;
332 
333         err = register_pernet_device(&l2tp_eth_net_ops);
334         if (err)
335                 goto out_unreg;
336 
337         pr_info("L2TP ethernet pseudowire support (L2TPv3)\n");
338 
339         return 0;
340 
341 out_unreg:
342         l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
343 out:
344         return err;
345 }
346 
347 static void __exit l2tp_eth_exit(void)
348 {
349         unregister_pernet_device(&l2tp_eth_net_ops);
350         l2tp_nl_unregister_ops(L2TP_PWTYPE_ETH);
351 }
352 
353 module_init(l2tp_eth_init);
354 module_exit(l2tp_eth_exit);
355 
356 MODULE_LICENSE("GPL");
357 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
358 MODULE_DESCRIPTION("L2TP ethernet pseudowire driver");
359 MODULE_VERSION("1.0");
360 

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