[mirror_ubuntu-bionic-kernel.git] / net / l2tp / l2tp_core.h

/*
 * L2TP internal definitions.
 *
 * Copyright (c) 2008,2009 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 version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/refcount.h>

#ifndef _L2TP_CORE_H_
#define _L2TP_CORE_H_

/* Just some random numbers */
#define L2TP_TUNNEL_MAGIC	0x42114DDA
#define L2TP_SESSION_MAGIC	0x0C04EB7D

/* Per tunnel, session hash table size */
#define L2TP_HASH_BITS	4
#define L2TP_HASH_SIZE	(1 << L2TP_HASH_BITS)

/* System-wide, session hash table size */
#define L2TP_HASH_BITS_2	8
#define L2TP_HASH_SIZE_2	(1 << L2TP_HASH_BITS_2)

struct sk_buff;

struct l2tp_stats {
	atomic_long_t		tx_packets;
	atomic_long_t		tx_bytes;
	atomic_long_t		tx_errors;
	atomic_long_t		rx_packets;
	atomic_long_t		rx_bytes;
	atomic_long_t		rx_seq_discards;
	atomic_long_t		rx_oos_packets;
	atomic_long_t		rx_errors;
	atomic_long_t		rx_cookie_discards;
};

struct l2tp_tunnel;

/* Describes a session. Contains information to determine incoming
 * packets and transmit outgoing ones.
 */
struct l2tp_session_cfg {
	enum l2tp_pwtype	pw_type;
	unsigned int		data_seq:2;	/* data sequencing level
						 * 0 => none, 1 => IP only,
						 * 2 => all
						 */
	unsigned int		recv_seq:1;	/* expect receive packets with
						 * sequence numbers? */
	unsigned int		send_seq:1;	/* send packets with sequence
						 * numbers? */
	unsigned int		lns_mode:1;	/* behave as LNS? LAC enables
						 * sequence numbers under
						 * control of LNS. */
	int			debug;		/* bitmask of debug message
						 * categories */
	u16			vlan_id;	/* VLAN pseudowire only */
	u16			offset;		/* offset to payload */
	u16			l2specific_len;	/* Layer 2 specific length */
	u16			l2specific_type; /* Layer 2 specific type */
	u8			cookie[8];	/* optional cookie */
	int			cookie_len;	/* 0, 4 or 8 bytes */
	u8			peer_cookie[8];	/* peer's cookie */
	int			peer_cookie_len; /* 0, 4 or 8 bytes */
	int			reorder_timeout; /* configured reorder timeout
						  * (in jiffies) */
	int			mtu;
	int			mru;
	char			*ifname;
};

struct l2tp_session {
	int			magic;		/* should be
						 * L2TP_SESSION_MAGIC */

	struct l2tp_tunnel	*tunnel;	/* back pointer to tunnel
						 * context */
	u32			session_id;
	u32			peer_session_id;
	u8			cookie[8];
	int			cookie_len;
	u8			peer_cookie[8];
	int			peer_cookie_len;
	u16			offset;		/* offset from end of L2TP header
						   to beginning of data */
	u16			l2specific_len;
	u16			l2specific_type;
	u16			hdr_len;
	u32			nr;		/* session NR state (receive) */
	u32			ns;		/* session NR state (send) */
	struct sk_buff_head	reorder_q;	/* receive reorder queue */
	u32			nr_max;		/* max NR. Depends on tunnel */
	u32			nr_window_size;	/* NR window size */
	u32			nr_oos;		/* NR of last OOS packet */
	int			nr_oos_count;	/* For OOS recovery */
	int			nr_oos_count_max;
	struct hlist_node	hlist;		/* Hash list node */
	refcount_t		ref_count;

	char			name[32];	/* for logging */
	char			ifname[IFNAMSIZ];
	unsigned int		data_seq:2;	/* data sequencing level
						 * 0 => none, 1 => IP only,
						 * 2 => all
						 */
	unsigned int		recv_seq:1;	/* expect receive packets with
						 * sequence numbers? */
	unsigned int		send_seq:1;	/* send packets with sequence
						 * numbers? */
	unsigned int		lns_mode:1;	/* behave as LNS? LAC enables
						 * sequence numbers under
						 * control of LNS. */
	int			debug;		/* bitmask of debug message
						 * categories */
	int			reorder_timeout; /* configured reorder timeout
						  * (in jiffies) */
	int			reorder_skip;	/* set if skip to next nr */
	int			mtu;
	int			mru;
	enum l2tp_pwtype	pwtype;
	struct l2tp_stats	stats;
	struct hlist_node	global_hlist;	/* Global hash list node */

	int (*build_header)(struct l2tp_session *session, void *buf);
	void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
	void (*session_close)(struct l2tp_session *session);
	void (*ref)(struct l2tp_session *session);
	void (*deref)(struct l2tp_session *session);
#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
	void (*show)(struct seq_file *m, void *priv);
#endif
	uint8_t			priv[0];	/* private data */
};

/* Describes the tunnel. It contains info to track all the associated
 * sessions so incoming packets can be sorted out
 */
struct l2tp_tunnel_cfg {
	int			debug;		/* bitmask of debug message
						 * categories */
	enum l2tp_encap_type	encap;

	/* Used only for kernel-created sockets */
	struct in_addr		local_ip;
	struct in_addr		peer_ip;
#if IS_ENABLED(CONFIG_IPV6)
	struct in6_addr		*local_ip6;
	struct in6_addr		*peer_ip6;
#endif
	u16			local_udp_port;
	u16			peer_udp_port;
	unsigned int		use_udp_checksums:1,
				udp6_zero_tx_checksums:1,
				udp6_zero_rx_checksums:1;
};

struct l2tp_tunnel {
	int			magic;		/* Should be L2TP_TUNNEL_MAGIC */
	struct rcu_head rcu;
	rwlock_t		hlist_lock;	/* protect session_hlist */
	bool			acpt_newsess;	/* Indicates whether this
						 * tunnel accepts new sessions.
						 * Protected by hlist_lock.
						 */
	struct hlist_head	session_hlist[L2TP_HASH_SIZE];
						/* hashed list of sessions,
						 * hashed by id */
	u32			tunnel_id;
	u32			peer_tunnel_id;
	int			version;	/* 2=>L2TPv2, 3=>L2TPv3 */

	char			name[20];	/* for logging */
	int			debug;		/* bitmask of debug message
						 * categories */
	enum l2tp_encap_type	encap;
	struct l2tp_stats	stats;

	struct list_head	list;		/* Keep a list of all tunnels */
	struct net		*l2tp_net;	/* the net we belong to */

	refcount_t		ref_count;
#ifdef CONFIG_DEBUG_FS
	void (*show)(struct seq_file *m, void *arg);
#endif
	int (*recv_payload_hook)(struct sk_buff *skb);
	void (*old_sk_destruct)(struct sock *);
	struct sock		*sock;		/* Parent socket */
	int			fd;		/* Parent fd, if tunnel socket
						 * was created by userspace */
#if IS_ENABLED(CONFIG_IPV6)
	bool			v4mapped;
#endif

	struct work_struct	del_work;

	uint8_t			priv[0];	/* private data */
};

struct l2tp_nl_cmd_ops {
	int (*session_create)(struct net *net, struct l2tp_tunnel *tunnel,
			      u32 session_id, u32 peer_session_id,
			      struct l2tp_session_cfg *cfg);
	int (*session_delete)(struct l2tp_session *session);
};

static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel)
{
	return &tunnel->priv[0];
}

static inline void *l2tp_session_priv(struct l2tp_session *session)
{
	return &session->priv[0];
}

static inline struct l2tp_tunnel *l2tp_sock_to_tunnel(struct sock *sk)
{
	struct l2tp_tunnel *tunnel;

	if (sk == NULL)
		return NULL;

	sock_hold(sk);
	tunnel = (struct l2tp_tunnel *)(sk->sk_user_data);
	if (tunnel == NULL) {
		sock_put(sk);
		goto out;
	}

	BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);

out:
	return tunnel;
}

struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);

struct l2tp_session *l2tp_session_get(const struct net *net,
				      struct l2tp_tunnel *tunnel,
				      u32 session_id, bool do_ref);
struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth,
					  bool do_ref);
struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
						const char *ifname,
						bool do_ref);
struct l2tp_tunnel *l2tp_tunnel_find(const struct net *net, u32 tunnel_id);
struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth);

int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
		       u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
		       struct l2tp_tunnel **tunnelp);
void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
struct l2tp_session *l2tp_session_create(int priv_size,
					 struct l2tp_tunnel *tunnel,
					 u32 session_id, u32 peer_session_id,
					 struct l2tp_session_cfg *cfg);
void __l2tp_session_unhash(struct l2tp_session *session);
int l2tp_session_delete(struct l2tp_session *session);
void l2tp_session_free(struct l2tp_session *session);
void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
		      unsigned char *ptr, unsigned char *optr, u16 hdrflags,
		      int length, int (*payload_hook)(struct sk_buff *skb));
int l2tp_session_queue_purge(struct l2tp_session *session);
int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
void l2tp_session_set_header_len(struct l2tp_session *session, int version);

int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb,
		  int hdr_len);

int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
			 const struct l2tp_nl_cmd_ops *ops);
void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);

static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
{
	refcount_inc(&tunnel->ref_count);
}

static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
{
	if (refcount_dec_and_test(&tunnel->ref_count))
		kfree_rcu(tunnel, rcu);
}

/* Session reference counts. Incremented when code obtains a reference
 * to a session.
 */
static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session)
{
	refcount_inc(&session->ref_count);
}

static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
{
	if (refcount_dec_and_test(&session->ref_count))
		l2tp_session_free(session);
}

#ifdef L2TP_REFCNT_DEBUG
#define l2tp_session_inc_refcount(_s)					\
do {									\
	pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n",	\
		 __func__, __LINE__, (_s)->name,			\
		 refcount_read(&_s->ref_count));			\
	l2tp_session_inc_refcount_1(_s);				\
} while (0)
#define l2tp_session_dec_refcount(_s)					\
do {									\
	pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n",	\
		 __func__, __LINE__, (_s)->name,			\
		 refcount_read(&_s->ref_count));			\
	l2tp_session_dec_refcount_1(_s);				\
} while (0)
#else
#define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
#define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
#endif

#define l2tp_printk(ptr, type, func, fmt, ...)				\
do {									\
	if (((ptr)->debug) & (type))					\
		func(fmt, ##__VA_ARGS__);				\
} while (0)

#define l2tp_warn(ptr, type, fmt, ...)					\
	l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
#define l2tp_info(ptr, type, fmt, ...)					\
	l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
#define l2tp_dbg(ptr, type, fmt, ...)					\
	l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)

#define MODULE_ALIAS_L2TP_PWTYPE(type) \
	MODULE_ALIAS("net-l2tp-type-" __stringify(type))

#endif /* _L2TP_CORE_H_ */
Commit	Line	Data
fd558d18 JC	1	/*
	2	* L2TP internal definitions.
	3	*
	4	* Copyright (c) 2008,2009 Katalix Systems Ltd
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
fbea9e07	10	#include <linux/refcount.h>
fd558d18 JC	11
	12	#ifndef _L2TP_CORE_H_
	13	#define _L2TP_CORE_H_
	14
	15	/* Just some random numbers */
	16	#define L2TP_TUNNEL_MAGIC 0x42114DDA
	17	#define L2TP_SESSION_MAGIC 0x0C04EB7D
	18
f7faffa3	19	/* Per tunnel, session hash table size */
fd558d18 JC	20	#define L2TP_HASH_BITS 4
	21	#define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
	22
f7faffa3 JC	23	/* System-wide, session hash table size */
	24	#define L2TP_HASH_BITS_2 8
	25	#define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2)
	26
fd558d18 JC	27	struct sk_buff;
	28
	29	struct l2tp_stats {
7b7c0719 TP	30	atomic_long_t tx_packets;
	31	atomic_long_t tx_bytes;
	32	atomic_long_t tx_errors;
	33	atomic_long_t rx_packets;
	34	atomic_long_t rx_bytes;
	35	atomic_long_t rx_seq_discards;
	36	atomic_long_t rx_oos_packets;
	37	atomic_long_t rx_errors;
	38	atomic_long_t rx_cookie_discards;
fd558d18 JC	39	};
	40
	41	struct l2tp_tunnel;
	42
	43	/* Describes a session. Contains information to determine incoming
	44	* packets and transmit outgoing ones.
	45	*/
	46	struct l2tp_session_cfg {
f7faffa3	47	enum l2tp_pwtype pw_type;
95c96174	48	unsigned int data_seq:2; /* data sequencing level
fd558d18 JC	49	* 0 => none, 1 => IP only,
	50	* 2 => all
	51	*/
95c96174	52	unsigned int recv_seq:1; /* expect receive packets with
fd558d18	53	* sequence numbers? */
95c96174	54	unsigned int send_seq:1; /* send packets with sequence
fd558d18	55	* numbers? */
95c96174	56	unsigned int lns_mode:1; /* behave as LNS? LAC enables
fd558d18 JC	57	* sequence numbers under
	58	* control of LNS. */
	59	int debug; /* bitmask of debug message
	60	* categories */
309795f4	61	u16 vlan_id; /* VLAN pseudowire only */
f7faffa3 JC	62	u16 offset; /* offset to payload */
	63	u16 l2specific_len; /* Layer 2 specific length */
	64	u16 l2specific_type; /* Layer 2 specific type */
	65	u8 cookie[8]; /* optional cookie */
	66	int cookie_len; /* 0, 4 or 8 bytes */
	67	u8 peer_cookie[8]; /* peer's cookie */
	68	int peer_cookie_len; /* 0, 4 or 8 bytes */
fd558d18 JC	69	int reorder_timeout; /* configured reorder timeout
	70	* (in jiffies) */
	71	int mtu;
	72	int mru;
309795f4	73	char *ifname;
fd558d18 JC	74	};
	75
	76	struct l2tp_session {
	77	int magic; /* should be
	78	* L2TP_SESSION_MAGIC */
	79
	80	struct l2tp_tunnel tunnel; / back pointer to tunnel
	81	* context */
	82	u32 session_id;
	83	u32 peer_session_id;
f7faffa3 JC	84	u8 cookie[8];
	85	int cookie_len;
	86	u8 peer_cookie[8];
	87	int peer_cookie_len;
	88	u16 offset; /* offset from end of L2TP header
	89	to beginning of data */
	90	u16 l2specific_len;
	91	u16 l2specific_type;
	92	u16 hdr_len;
	93	u32 nr; /* session NR state (receive) */
	94	u32 ns; /* session NR state (send) */
fd558d18	95	struct sk_buff_head reorder_q; /* receive reorder queue */
8a1631d5 JC	96	u32 nr_max; /* max NR. Depends on tunnel */
8a1631d5 JC	97	u32 nr_window_size; /* NR window size */
a0dbd822 JC	98	u32 nr_oos; /* NR of last OOS packet */
	99	int nr_oos_count; /* For OOS recovery */
	100	int nr_oos_count_max;
fd558d18	101	struct hlist_node hlist; /* Hash list node */
f00c854c	102	refcount_t ref_count;
fd558d18 JC	103
fd558d18 JC	104	char name[32]; /* for logging */
309795f4	105	char ifname[IFNAMSIZ];
95c96174	106	unsigned int data_seq:2; /* data sequencing level
fd558d18 JC	107	* 0 => none, 1 => IP only,
	108	* 2 => all
	109	*/
95c96174	110	unsigned int recv_seq:1; /* expect receive packets with
fd558d18	111	* sequence numbers? */
95c96174	112	unsigned int send_seq:1; /* send packets with sequence
fd558d18	113	* numbers? */
95c96174	114	unsigned int lns_mode:1; /* behave as LNS? LAC enables
fd558d18 JC	115	* sequence numbers under
	116	* control of LNS. */
	117	int debug; /* bitmask of debug message
	118	* categories */
	119	int reorder_timeout; /* configured reorder timeout
	120	* (in jiffies) */
38d40b3f	121	int reorder_skip; /* set if skip to next nr */
fd558d18 JC	122	int mtu;
fd558d18 JC	123	int mru;
f7faffa3	124	enum l2tp_pwtype pwtype;
fd558d18	125	struct l2tp_stats stats;
f7faffa3	126	struct hlist_node global_hlist; /* Global hash list node */
fd558d18	127
f7faffa3	128	int (build_header)(struct l2tp_session session, void *buf);
fd558d18 JC	129	void (recv_skb)(struct l2tp_session session, struct sk_buff *skb, int data_len);
	130	void (session_close)(struct l2tp_session session);
	131	void (ref)(struct l2tp_session session);
	132	void (deref)(struct l2tp_session session);
9dd79945	133	#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
0ad66140 JC	134	void (show)(struct seq_file m, void *priv);
0ad66140 JC	135	#endif
fd558d18 JC	136	uint8_t priv[0]; /* private data */
	137	};
	138
	139	/* Describes the tunnel. It contains info to track all the associated
	140	* sessions so incoming packets can be sorted out
	141	*/
	142	struct l2tp_tunnel_cfg {
	143	int debug; /* bitmask of debug message
	144	* categories */
0d76751f	145	enum l2tp_encap_type encap;
789a4a2c JC	146
	147	/* Used only for kernel-created sockets */
	148	struct in_addr local_ip;
	149	struct in_addr peer_ip;
f9bac8df CE	150	#if IS_ENABLED(CONFIG_IPV6)
	151	struct in6_addr *local_ip6;
	152	struct in6_addr *peer_ip6;
	153	#endif
789a4a2c JC	154	u16 local_udp_port;
789a4a2c JC	155	u16 peer_udp_port;
6b649fea TH	156	unsigned int use_udp_checksums:1,
	157	udp6_zero_tx_checksums:1,
	158	udp6_zero_rx_checksums:1;
fd558d18 JC	159	};
	160
	161	struct l2tp_tunnel {
	162	int magic; /* Should be L2TP_TUNNEL_MAGIC */
99469c32	163	struct rcu_head rcu;
fd558d18	164	rwlock_t hlist_lock; /* protect session_hlist */
f3c66d4e GN	165	bool acpt_newsess; /* Indicates whether this
	166	* tunnel accepts new sessions.
	167	* Protected by hlist_lock.
	168	*/
fd558d18 JC	169	struct hlist_head session_hlist[L2TP_HASH_SIZE];
	170	/* hashed list of sessions,
	171	* hashed by id */
	172	u32 tunnel_id;
	173	u32 peer_tunnel_id;
	174	int version; /* 2=>L2TPv2, 3=>L2TPv3 */
	175
	176	char name[20]; /* for logging */
	177	int debug; /* bitmask of debug message
	178	* categories */
0d76751f	179	enum l2tp_encap_type encap;
fd558d18 JC	180	struct l2tp_stats stats;
	181
	182	struct list_head list; /* Keep a list of all tunnels */
	183	struct net l2tp_net; / the net we belong to */
	184
fbea9e07	185	refcount_t ref_count;
0ad66140 JC	186	#ifdef CONFIG_DEBUG_FS
	187	void (show)(struct seq_file m, void *arg);
	188	#endif
fd558d18 JC	189	int (recv_payload_hook)(struct sk_buff skb);
	190	void (old_sk_destruct)(struct sock );
	191	struct sock sock; / Parent socket */
80d84ef3 TP	192	int fd; /* Parent fd, if tunnel socket
80d84ef3 TP	193	* was created by userspace */
e18503f4 FC	194	#if IS_ENABLED(CONFIG_IPV6)
	195	bool v4mapped;
	196	#endif
fd558d18	197
f8ccac0e TP	198	struct work_struct del_work;
f8ccac0e TP	199
fd558d18 JC	200	uint8_t priv[0]; /* private data */
	201	};
	202
309795f4	203	struct l2tp_nl_cmd_ops {
f026bc29 GN	204	int (session_create)(struct net net, struct l2tp_tunnel *tunnel,
	205	u32 session_id, u32 peer_session_id,
	206	struct l2tp_session_cfg *cfg);
309795f4 JC	207	int (session_delete)(struct l2tp_session session);
	208	};
	209
fd558d18 JC	210	static inline void l2tp_tunnel_priv(struct l2tp_tunnel tunnel)
	211	{
	212	return &tunnel->priv[0];
	213	}
	214
	215	static inline void l2tp_session_priv(struct l2tp_session session)
	216	{
	217	return &session->priv[0];
	218	}
	219
	220	static inline struct l2tp_tunnel l2tp_sock_to_tunnel(struct sock sk)
	221	{
	222	struct l2tp_tunnel *tunnel;
	223
	224	if (sk == NULL)
	225	return NULL;
	226
	227	sock_hold(sk);
	228	tunnel = (struct l2tp_tunnel *)(sk->sk_user_data);
	229	if (tunnel == NULL) {
	230	sock_put(sk);
	231	goto out;
	232	}
	233
	234	BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
	235
	236	out:
	237	return tunnel;
	238	}
	239
54652eb1 GN	240	struct l2tp_tunnel l2tp_tunnel_get(const struct net net, u32 tunnel_id);
54652eb1 GN	241
9aaef50c	242	struct l2tp_session l2tp_session_get(const struct net net,
61b9a047 GN	243	struct l2tp_tunnel *tunnel,
61b9a047 GN	244	u32 session_id, bool do_ref);
e08293a4 GN	245	struct l2tp_session l2tp_session_get_nth(struct l2tp_tunnel tunnel, int nth,
e08293a4 GN	246	bool do_ref);
9aaef50c GN	247	struct l2tp_session l2tp_session_get_by_ifname(const struct net net,
9aaef50c GN	248	const char *ifname,
2777e2ab	249	bool do_ref);
2f858b92 GN	250	struct l2tp_tunnel l2tp_tunnel_find(const struct net net, u32 tunnel_id);
2f858b92 GN	251	struct l2tp_tunnel l2tp_tunnel_find_nth(const struct net net, int nth);
c1b1203d JP	252
	253	int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
	254	u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
	255	struct l2tp_tunnel **tunnelp);
	256	void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
	257	int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
	258	struct l2tp_session *l2tp_session_create(int priv_size,
	259	struct l2tp_tunnel *tunnel,
	260	u32 session_id, u32 peer_session_id,
	261	struct l2tp_session_cfg *cfg);
	262	void __l2tp_session_unhash(struct l2tp_session *session);
	263	int l2tp_session_delete(struct l2tp_session *session);
	264	void l2tp_session_free(struct l2tp_session *session);
	265	void l2tp_recv_common(struct l2tp_session session, struct sk_buff skb,
	266	unsigned char ptr, unsigned char optr, u16 hdrflags,
	267	int length, int (payload_hook)(struct sk_buff skb));
	268	int l2tp_session_queue_purge(struct l2tp_session *session);
	269	int l2tp_udp_encap_recv(struct sock sk, struct sk_buff skb);
bb5016ea	270	void l2tp_session_set_header_len(struct l2tp_session *session, int version);
c1b1203d JP	271
	272	int l2tp_xmit_skb(struct l2tp_session session, struct sk_buff skb,
	273	int hdr_len);
	274
	275	int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
	276	const struct l2tp_nl_cmd_ops *ops);
	277	void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
72fb96e7	278	int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
309795f4	279
54652eb1 GN	280	static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
	281	{
	282	refcount_inc(&tunnel->ref_count);
	283	}
	284
	285	static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
	286	{
	287	if (refcount_dec_and_test(&tunnel->ref_count))
	288	kfree_rcu(tunnel, rcu);
	289	}
	290
fd558d18 JC	291	/* Session reference counts. Incremented when code obtains a reference
	292	* to a session.
	293	*/
	294	static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session)
	295	{
f00c854c	296	refcount_inc(&session->ref_count);
fd558d18 JC	297	}
	298
	299	static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
	300	{
f00c854c	301	if (refcount_dec_and_test(&session->ref_count))
fd558d18 JC	302	l2tp_session_free(session);
	303	}
	304
	305	#ifdef L2TP_REFCNT_DEBUG
a4ca44fa JP	306	#define l2tp_session_inc_refcount(_s) \
	307	do { \
	308	pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", \
	309	__func__, __LINE__, (_s)->name, \
f00c854c	310	refcount_read(&_s->ref_count)); \
a4ca44fa JP	311	l2tp_session_inc_refcount_1(_s); \
	312	} while (0)
	313	#define l2tp_session_dec_refcount(_s) \
	314	do { \
	315	pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", \
	316	__func__, __LINE__, (_s)->name, \
f00c854c	317	refcount_read(&_s->ref_count)); \
a4ca44fa JP	318	l2tp_session_dec_refcount_1(_s); \
a4ca44fa JP	319	} while (0)
fd558d18 JC	320	#else
	321	#define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
	322	#define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
	323	#endif
	324
a4ca44fa JP	325	#define l2tp_printk(ptr, type, func, fmt, ...) \
	326	do { \
	327	if (((ptr)->debug) & (type)) \
	328	func(fmt, ##__VA_ARGS__); \
	329	} while (0)
	330
	331	#define l2tp_warn(ptr, type, fmt, ...) \
	332	l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
	333	#define l2tp_info(ptr, type, fmt, ...) \
	334	l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
	335	#define l2tp_dbg(ptr, type, fmt, ...) \
	336	l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
	337
f1f39f91	338	#define MODULE_ALIAS_L2TP_PWTYPE(type) \
	339	MODULE_ALIAS("net-l2tp-type-" __stringify(type))
	340
fd558d18	341	#endif /* _L2TP_CORE_H_ */