[linux-2.6-block.git] / net / l2tp / l2tp_debugfs.c

/*
 * L2TP subsystem debugfs
 *
 * Copyright (c) 2010 Katalix Systems Ltd
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/hash.h>
#include <linux/l2tp.h>
#include <linux/in.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/inet_hashtables.h>
#include <net/tcp_states.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

#include "l2tp_core.h"

static struct dentry *rootdir;
static struct dentry *tunnels;

struct l2tp_dfs_seq_data {
	struct net *net;
	int tunnel_idx;			/* current tunnel */
	int session_idx;		/* index of session within current tunnel */
	struct l2tp_tunnel *tunnel;
	struct l2tp_session *session;	/* NULL means get next tunnel */
};

static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
{
	pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
	pd->tunnel_idx++;
}

static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
{
	pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
	pd->session_idx++;

	if (pd->session == NULL) {
		pd->session_idx = 0;
		l2tp_dfs_next_tunnel(pd);
	}

}

static void *l2tp_dfs_seq_start(struct seq_file *m, loff_t *offs)
{
	struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
	loff_t pos = *offs;

	if (!pos)
		goto out;

	BUG_ON(m->private == NULL);
	pd = m->private;

	if (pd->tunnel == NULL)
		l2tp_dfs_next_tunnel(pd);
	else
		l2tp_dfs_next_session(pd);

	/* NULL tunnel and session indicates end of list */
	if ((pd->tunnel == NULL) && (pd->session == NULL))
		pd = NULL;

out:
	return pd;
}


static void *l2tp_dfs_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return NULL;
}

static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
{
	/* nothing to do */
}

static void l2tp_dfs_seq_tunnel_show(struct seq_file *m, void *v)
{
	struct l2tp_tunnel *tunnel = v;
	int session_count = 0;
	int hash;
	struct hlist_node *walk;
	struct hlist_node *tmp;

	read_lock_bh(&tunnel->hlist_lock);
	for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
		hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
			struct l2tp_session *session;

			session = hlist_entry(walk, struct l2tp_session, hlist);
			if (session->session_id == 0)
				continue;

			session_count++;
		}
	}
	read_unlock_bh(&tunnel->hlist_lock);

	seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
	if (tunnel->sock) {
		struct inet_sock *inet = inet_sk(tunnel->sock);

#if IS_ENABLED(CONFIG_IPV6)
		if (tunnel->sock->sk_family == AF_INET6) {
			const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);

			seq_printf(m, " from %pI6c to %pI6c\n",
				&np->saddr, &tunnel->sock->sk_v6_daddr);
		} else
#endif
		seq_printf(m, " from %pI4 to %pI4\n",
			   &inet->inet_saddr, &inet->inet_daddr);
		if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
			seq_printf(m, " source port %hu, dest port %hu\n",
				   ntohs(inet->inet_sport), ntohs(inet->inet_dport));
	}
	seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
		   tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
		   tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
		   "");
	seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
		   tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
		   atomic_read(&tunnel->ref_count));

	seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n",
		   tunnel->debug,
		   atomic_long_read(&tunnel->stats.tx_packets),
		   atomic_long_read(&tunnel->stats.tx_bytes),
		   atomic_long_read(&tunnel->stats.tx_errors),
		   atomic_long_read(&tunnel->stats.rx_packets),
		   atomic_long_read(&tunnel->stats.rx_bytes),
		   atomic_long_read(&tunnel->stats.rx_errors));

	if (tunnel->show != NULL)
		tunnel->show(m, tunnel);
}

static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
{
	struct l2tp_session *session = v;

	seq_printf(m, "  SESSION %u, peer %u, %s\n", session->session_id,
		   session->peer_session_id,
		   session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
		   session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
		   "");
	if (session->send_seq || session->recv_seq)
		seq_printf(m, "   nr %hu, ns %hu\n", session->nr, session->ns);
	seq_printf(m, "   refcnt %d\n", atomic_read(&session->ref_count));
	seq_printf(m, "   config %d/%d/%c/%c/%s/%s %08x %u\n",
		   session->mtu, session->mru,
		   session->recv_seq ? 'R' : '-',
		   session->send_seq ? 'S' : '-',
		   session->data_seq == 1 ? "IPSEQ" :
		   session->data_seq == 2 ? "DATASEQ" : "-",
		   session->lns_mode ? "LNS" : "LAC",
		   session->debug,
		   jiffies_to_msecs(session->reorder_timeout));
	seq_printf(m, "   offset %hu l2specific %hu/%hu\n",
		   session->offset, session->l2specific_type, session->l2specific_len);
	if (session->cookie_len) {
		seq_printf(m, "   cookie %02x%02x%02x%02x",
			   session->cookie[0], session->cookie[1],
			   session->cookie[2], session->cookie[3]);
		if (session->cookie_len == 8)
			seq_printf(m, "%02x%02x%02x%02x",
				   session->cookie[4], session->cookie[5],
				   session->cookie[6], session->cookie[7]);
		seq_printf(m, "\n");
	}
	if (session->peer_cookie_len) {
		seq_printf(m, "   peer cookie %02x%02x%02x%02x",
			   session->peer_cookie[0], session->peer_cookie[1],
			   session->peer_cookie[2], session->peer_cookie[3]);
		if (session->peer_cookie_len == 8)
			seq_printf(m, "%02x%02x%02x%02x",
				   session->peer_cookie[4], session->peer_cookie[5],
				   session->peer_cookie[6], session->peer_cookie[7]);
		seq_printf(m, "\n");
	}

	seq_printf(m, "   %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",
		   session->nr, session->ns,
		   atomic_long_read(&session->stats.tx_packets),
		   atomic_long_read(&session->stats.tx_bytes),
		   atomic_long_read(&session->stats.tx_errors),
		   atomic_long_read(&session->stats.rx_packets),
		   atomic_long_read(&session->stats.rx_bytes),
		   atomic_long_read(&session->stats.rx_errors));

	if (session->show != NULL)
		session->show(m, session);
}

static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
{
	struct l2tp_dfs_seq_data *pd = v;

	/* display header on line 1 */
	if (v == SEQ_START_TOKEN) {
		seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
		seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
		seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
		seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
		seq_puts(m, "  SESSION ID, peer ID, PWTYPE\n");
		seq_puts(m, "   refcnt cnt\n");
		seq_puts(m, "   offset OFFSET l2specific TYPE/LEN\n");
		seq_puts(m, "   [ cookie ]\n");
		seq_puts(m, "   [ peer cookie ]\n");
		seq_puts(m, "   config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
		seq_puts(m, "   nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
		goto out;
	}

	/* Show the tunnel or session context */
	if (pd->session == NULL)
		l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
	else
		l2tp_dfs_seq_session_show(m, pd->session);

out:
	return 0;
}

static const struct seq_operations l2tp_dfs_seq_ops = {
	.start		= l2tp_dfs_seq_start,
	.next		= l2tp_dfs_seq_next,
	.stop		= l2tp_dfs_seq_stop,
	.show		= l2tp_dfs_seq_show,
};

static int l2tp_dfs_seq_open(struct inode *inode, struct file *file)
{
	struct l2tp_dfs_seq_data *pd;
	struct seq_file *seq;
	int rc = -ENOMEM;

	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	if (pd == NULL)
		goto out;

	/* Derive the network namespace from the pid opening the
	 * file.
	 */
	pd->net = get_net_ns_by_pid(current->pid);
	if (IS_ERR(pd->net)) {
		rc = PTR_ERR(pd->net);
		goto err_free_pd;
	}

	rc = seq_open(file, &l2tp_dfs_seq_ops);
	if (rc)
		goto err_free_net;

	seq = file->private_data;
	seq->private = pd;

out:
	return rc;

err_free_net:
	put_net(pd->net);
err_free_pd:
	kfree(pd);
	goto out;
}

static int l2tp_dfs_seq_release(struct inode *inode, struct file *file)
{
	struct l2tp_dfs_seq_data *pd;
	struct seq_file *seq;

	seq = file->private_data;
	pd = seq->private;
	if (pd->net)
		put_net(pd->net);
	kfree(pd);
	seq_release(inode, file);

	return 0;
}

static const struct file_operations l2tp_dfs_fops = {
	.owner		= THIS_MODULE,
	.open		= l2tp_dfs_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= l2tp_dfs_seq_release,
};

static int __init l2tp_debugfs_init(void)
{
	int rc = 0;

	rootdir = debugfs_create_dir("l2tp", NULL);
	if (IS_ERR(rootdir)) {
		rc = PTR_ERR(rootdir);
		rootdir = NULL;
		goto out;
	}

	tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
	if (tunnels == NULL)
		rc = -EIO;

	pr_info("L2TP debugfs support\n");

out:
	if (rc)
		pr_warn("unable to init\n");

	return rc;
}

static void __exit l2tp_debugfs_exit(void)
{
	debugfs_remove(tunnels);
	debugfs_remove(rootdir);
}

module_init(l2tp_debugfs_init);
module_exit(l2tp_debugfs_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
MODULE_DESCRIPTION("L2TP debugfs driver");
MODULE_VERSION("1.0");
Commit	Line	Data
0ad66140 JC	1	/*
	2	* L2TP subsystem debugfs
	3	*
	4	* Copyright (c) 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
a4ca44fa JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a4ca44fa JP	13
0ad66140 JC	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 <linux/debugfs.h>
	23	#include <net/sock.h>
	24	#include <net/ip.h>
	25	#include <net/icmp.h>
	26	#include <net/udp.h>
	27	#include <net/inet_common.h>
	28	#include <net/inet_hashtables.h>
	29	#include <net/tcp_states.h>
	30	#include <net/protocol.h>
	31	#include <net/xfrm.h>
	32	#include <net/net_namespace.h>
	33	#include <net/netns/generic.h>
	34
	35	#include "l2tp_core.h"
	36
	37	static struct dentry *rootdir;
	38	static struct dentry *tunnels;
	39
	40	struct l2tp_dfs_seq_data {
	41	struct net *net;
	42	int tunnel_idx; /* current tunnel */
	43	int session_idx; /* index of session within current tunnel */
	44	struct l2tp_tunnel *tunnel;
	45	struct l2tp_session session; / NULL means get next tunnel */
	46	};
	47
	48	static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
	49	{
	50	pd->tunnel = l2tp_tunnel_find_nth(pd->net, pd->tunnel_idx);
	51	pd->tunnel_idx++;
	52	}
	53
	54	static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
	55	{
	56	pd->session = l2tp_session_find_nth(pd->tunnel, pd->session_idx);
	57	pd->session_idx++;
	58
	59	if (pd->session == NULL) {
	60	pd->session_idx = 0;
	61	l2tp_dfs_next_tunnel(pd);
	62	}
	63
	64	}
	65
	66	static void l2tp_dfs_seq_start(struct seq_file m, loff_t *offs)
	67	{
	68	struct l2tp_dfs_seq_data *pd = SEQ_START_TOKEN;
	69	loff_t pos = *offs;
	70
	71	if (!pos)
	72	goto out;
	73
	74	BUG_ON(m->private == NULL);
	75	pd = m->private;
	76
	77	if (pd->tunnel == NULL)
78	l2tp_dfs_next_tunnel(pd);
79	else
80	l2tp_dfs_next_session(pd);
81
82	/* NULL tunnel and session indicates end of list */
83	if ((pd->tunnel == NULL) && (pd->session == NULL))
84	pd = NULL;
85
86	out:
87	return pd;
88	}
89
90
91	static void l2tp_dfs_seq_next(struct seq_file m, void v, loff_t pos)
92	{
93	(*pos)++;
94	return NULL;
95	}
96
97	static void l2tp_dfs_seq_stop(struct seq_file p, void v)
98	{
99	/* nothing to do */
100	}
101
102	static void l2tp_dfs_seq_tunnel_show(struct seq_file m, void v)
103	{
104	struct l2tp_tunnel *tunnel = v;
105	int session_count = 0;
106	int hash;
107	struct hlist_node *walk;
108	struct hlist_node *tmp;
109
110	read_lock_bh(&tunnel->hlist_lock);
111	for (hash = 0; hash < L2TP_HASH_SIZE; hash++) {
112	hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
113	struct l2tp_session *session;
114
115	session = hlist_entry(walk, struct l2tp_session, hlist);
116	if (session->session_id == 0)
117	continue;
118
119	session_count++;
120	}
121	}
122	read_unlock_bh(&tunnel->hlist_lock);
123
124	seq_printf(m, "\nTUNNEL %u peer %u", tunnel->tunnel_id, tunnel->peer_tunnel_id);
125	if (tunnel->sock) {
126	struct inet_sock *inet = inet_sk(tunnel->sock);
2121c3f5 CE	127
	128	#if IS_ENABLED(CONFIG_IPV6)
	129	if (tunnel->sock->sk_family == AF_INET6) {
efe4208f ED	130	const struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
efe4208f ED	131
2121c3f5	132	seq_printf(m, " from %pI6c to %pI6c\n",
efe4208f	133	&np->saddr, &tunnel->sock->sk_v6_daddr);
2121c3f5 CE	134	} else
2121c3f5 CE	135	#endif
a4fbf841 JP	136	seq_printf(m, " from %pI4 to %pI4\n",
a4fbf841 JP	137	&inet->inet_saddr, &inet->inet_daddr);
0ad66140 JC	138	if (tunnel->encap == L2TP_ENCAPTYPE_UDP)
	139	seq_printf(m, " source port %hu, dest port %hu\n",
	140	ntohs(inet->inet_sport), ntohs(inet->inet_dport));
	141	}
	142	seq_printf(m, " L2TPv%d, %s\n", tunnel->version,
	143	tunnel->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
	144	tunnel->encap == L2TP_ENCAPTYPE_IP ? "IP" :
	145	"");
	146	seq_printf(m, " %d sessions, refcnt %d/%d\n", session_count,
	147	tunnel->sock ? atomic_read(&tunnel->sock->sk_refcnt) : 0,
	148	atomic_read(&tunnel->ref_count));
	149
7b7c0719	150	seq_printf(m, " %08x rx %ld/%ld/%ld rx %ld/%ld/%ld\n",
0ad66140	151	tunnel->debug,
7b7c0719 TP	152	atomic_long_read(&tunnel->stats.tx_packets),
	153	atomic_long_read(&tunnel->stats.tx_bytes),
	154	atomic_long_read(&tunnel->stats.tx_errors),
	155	atomic_long_read(&tunnel->stats.rx_packets),
	156	atomic_long_read(&tunnel->stats.rx_bytes),
	157	atomic_long_read(&tunnel->stats.rx_errors));
0ad66140 JC	158
	159	if (tunnel->show != NULL)
	160	tunnel->show(m, tunnel);
	161	}
	162
	163	static void l2tp_dfs_seq_session_show(struct seq_file m, void v)
	164	{
	165	struct l2tp_session *session = v;
	166
	167	seq_printf(m, " SESSION %u, peer %u, %s\n", session->session_id,
	168	session->peer_session_id,
	169	session->pwtype == L2TP_PWTYPE_ETH ? "ETH" :
	170	session->pwtype == L2TP_PWTYPE_PPP ? "PPP" :
	171	"");
	172	if (session->send_seq \|\| session->recv_seq)
	173	seq_printf(m, " nr %hu, ns %hu\n", session->nr, session->ns);
	174	seq_printf(m, " refcnt %d\n", atomic_read(&session->ref_count));
	175	seq_printf(m, " config %d/%d/%c/%c/%s/%s %08x %u\n",
	176	session->mtu, session->mru,
	177	session->recv_seq ? 'R' : '-',
	178	session->send_seq ? 'S' : '-',
	179	session->data_seq == 1 ? "IPSEQ" :
	180	session->data_seq == 2 ? "DATASEQ" : "-",
	181	session->lns_mode ? "LNS" : "LAC",
	182	session->debug,
	183	jiffies_to_msecs(session->reorder_timeout));
	184	seq_printf(m, " offset %hu l2specific %hu/%hu\n",
	185	session->offset, session->l2specific_type, session->l2specific_len);
	186	if (session->cookie_len) {
	187	seq_printf(m, " cookie %02x%02x%02x%02x",
	188	session->cookie[0], session->cookie[1],
	189	session->cookie[2], session->cookie[3]);
	190	if (session->cookie_len == 8)
	191	seq_printf(m, "%02x%02x%02x%02x",
	192	session->cookie[4], session->cookie[5],
	193	session->cookie[6], session->cookie[7]);
	194	seq_printf(m, "\n");
	195	}
	196	if (session->peer_cookie_len) {
	197	seq_printf(m, " peer cookie %02x%02x%02x%02x",
	198	session->peer_cookie[0], session->peer_cookie[1],
	199	session->peer_cookie[2], session->peer_cookie[3]);
	200	if (session->peer_cookie_len == 8)
	201	seq_printf(m, "%02x%02x%02x%02x",
	202	session->peer_cookie[4], session->peer_cookie[5],
	203	session->peer_cookie[6], session->peer_cookie[7]);
	204	seq_printf(m, "\n");
	205	}
	206
7b7c0719	207	seq_printf(m, " %hu/%hu tx %ld/%ld/%ld rx %ld/%ld/%ld\n",
0ad66140	208	session->nr, session->ns,
7b7c0719 TP	209	atomic_long_read(&session->stats.tx_packets),
	210	atomic_long_read(&session->stats.tx_bytes),
	211	atomic_long_read(&session->stats.tx_errors),
	212	atomic_long_read(&session->stats.rx_packets),
	213	atomic_long_read(&session->stats.rx_bytes),
	214	atomic_long_read(&session->stats.rx_errors));
0ad66140 JC	215
	216	if (session->show != NULL)
	217	session->show(m, session);
	218	}
	219
	220	static int l2tp_dfs_seq_show(struct seq_file m, void v)
	221	{
	222	struct l2tp_dfs_seq_data *pd = v;
	223
	224	/* display header on line 1 */
	225	if (v == SEQ_START_TOKEN) {
	226	seq_puts(m, "TUNNEL ID, peer ID from IP to IP\n");
	227	seq_puts(m, " L2TPv2/L2TPv3, UDP/IP\n");
	228	seq_puts(m, " sessions session-count, refcnt refcnt/sk->refcnt\n");
	229	seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
	230	seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
	231	seq_puts(m, " refcnt cnt\n");
	232	seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
	233	seq_puts(m, " [ cookie ]\n");
	234	seq_puts(m, " [ peer cookie ]\n");
	235	seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
	236	seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
	237	goto out;
	238	}
	239
	240	/* Show the tunnel or session context */
	241	if (pd->session == NULL)
	242	l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
	243	else
	244	l2tp_dfs_seq_session_show(m, pd->session);
	245
	246	out:
	247	return 0;
	248	}
	249
	250	static const struct seq_operations l2tp_dfs_seq_ops = {
	251	.start = l2tp_dfs_seq_start,
	252	.next = l2tp_dfs_seq_next,
	253	.stop = l2tp_dfs_seq_stop,
	254	.show = l2tp_dfs_seq_show,
	255	};
	256
	257	static int l2tp_dfs_seq_open(struct inode inode, struct file file)
	258	{
	259	struct l2tp_dfs_seq_data *pd;
	260	struct seq_file *seq;
	261	int rc = -ENOMEM;
	262
6f9b9018	263	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
0ad66140 JC	264	if (pd == NULL)
	265	goto out;
	266
	267	/* Derive the network namespace from the pid opening the
	268	* file.
	269	*/
	270	pd->net = get_net_ns_by_pid(current->pid);
	271	if (IS_ERR(pd->net)) {
b8f07a06	272	rc = PTR_ERR(pd->net);
0ad66140 JC	273	goto err_free_pd;
	274	}
	275
	276	rc = seq_open(file, &l2tp_dfs_seq_ops);
	277	if (rc)
	278	goto err_free_net;
	279
	280	seq = file->private_data;
	281	seq->private = pd;
	282
	283	out:
	284	return rc;
	285
	286	err_free_net:
	287	put_net(pd->net);
	288	err_free_pd:
	289	kfree(pd);
	290	goto out;
	291	}
	292
	293	static int l2tp_dfs_seq_release(struct inode inode, struct file file)
	294	{
	295	struct l2tp_dfs_seq_data *pd;
	296	struct seq_file *seq;
	297
	298	seq = file->private_data;
	299	pd = seq->private;
	300	if (pd->net)
	301	put_net(pd->net);
	302	kfree(pd);
	303	seq_release(inode, file);
	304
	305	return 0;
	306	}
	307
	308	static const struct file_operations l2tp_dfs_fops = {
	309	.owner = THIS_MODULE,
	310	.open = l2tp_dfs_seq_open,
	311	.read = seq_read,
	312	.llseek = seq_lseek,
	313	.release = l2tp_dfs_seq_release,
	314	};
	315
	316	static int __init l2tp_debugfs_init(void)
	317	{
	318	int rc = 0;
	319
	320	rootdir = debugfs_create_dir("l2tp", NULL);
	321	if (IS_ERR(rootdir)) {
	322	rc = PTR_ERR(rootdir);
	323	rootdir = NULL;
	324	goto out;
	325	}
	326
	327	tunnels = debugfs_create_file("tunnels", 0600, rootdir, NULL, &l2tp_dfs_fops);
	328	if (tunnels == NULL)
	329	rc = -EIO;
	330
a4ca44fa	331	pr_info("L2TP debugfs support\n");
0ad66140 JC	332
	333	out:
	334	if (rc)
a4ca44fa	335	pr_warn("unable to init\n");
0ad66140 JC	336
	337	return rc;
	338	}
	339
	340	static void __exit l2tp_debugfs_exit(void)
	341	{
	342	debugfs_remove(tunnels);
	343	debugfs_remove(rootdir);
	344	}
	345
	346	module_init(l2tp_debugfs_init);
	347	module_exit(l2tp_debugfs_exit);
	348
	349	MODULE_LICENSE("GPL");
	350	MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
	351	MODULE_DESCRIPTION("L2TP debugfs driver");
	352	MODULE_VERSION("1.0");