[GitHub/mt8127/android_kernel_alcatel_ttab.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.
 */

#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)

/* Debug message categories for the DEBUG socket option */
enum {
	L2TP_MSG_DEBUG		= (1 << 0),	/* verbose debug (if
						 * compiled in) */
	L2TP_MSG_CONTROL	= (1 << 1),	/* userspace - kernel
						 * interface */
	L2TP_MSG_SEQ		= (1 << 2),	/* sequence numbers */
	L2TP_MSG_DATA		= (1 << 3),	/* data packets */
};

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 */
	struct hlist_node	hlist;		/* Hash list node */
	atomic_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 defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
	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;
};

struct l2tp_tunnel {
	int			magic;		/* Should be L2TP_TUNNEL_MAGIC */
	struct rcu_head rcu;
	rwlock_t		hlist_lock;	/* protect session_hlist */
	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 */

	atomic_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, u32 tunnel_id, 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;
}

extern struct sock *l2tp_tunnel_sock_lookup(struct l2tp_tunnel *tunnel);
extern void l2tp_tunnel_sock_put(struct sock *sk);
extern struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id);
extern struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth,
						 bool do_ref);
extern struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname);
extern struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id);
extern struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth);

extern 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);
extern void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
extern int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
extern 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);
extern void __l2tp_session_unhash(struct l2tp_session *session);
extern int l2tp_session_delete(struct l2tp_session *session);
extern void l2tp_session_free(struct l2tp_session *session);
extern 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));
extern int l2tp_session_queue_purge(struct l2tp_session *session);
extern int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);

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

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

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

static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
{
	if (atomic_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,			\
		 atomic_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,			\
		 atomic_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__)

#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	*/
	10
	11	#ifndef _L2TP_CORE_H_
	12	#define _L2TP_CORE_H_
	13
	14	/* Just some random numbers */
	15	#define L2TP_TUNNEL_MAGIC 0x42114DDA
	16	#define L2TP_SESSION_MAGIC 0x0C04EB7D
	17
f7faffa3	18	/* Per tunnel, session hash table size */
fd558d18 JC	19	#define L2TP_HASH_BITS 4
	20	#define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
	21
f7faffa3 JC	22	/* System-wide, session hash table size */
	23	#define L2TP_HASH_BITS_2 8
	24	#define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2)
	25
fd558d18 JC	26	/* Debug message categories for the DEBUG socket option */
	27	enum {
	28	L2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
	29	* compiled in) */
	30	L2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
	31	* interface */
	32	L2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
	33	L2TP_MSG_DATA = (1 << 3), /* data packets */
	34	};
	35
	36	struct sk_buff;
	37
	38	struct l2tp_stats {
7b7c0719 TP	39	atomic_long_t tx_packets;
	40	atomic_long_t tx_bytes;
	41	atomic_long_t tx_errors;
	42	atomic_long_t rx_packets;
	43	atomic_long_t rx_bytes;
	44	atomic_long_t rx_seq_discards;
	45	atomic_long_t rx_oos_packets;
	46	atomic_long_t rx_errors;
	47	atomic_long_t rx_cookie_discards;
fd558d18 JC	48	};
	49
	50	struct l2tp_tunnel;
	51
	52	/* Describes a session. Contains information to determine incoming
	53	* packets and transmit outgoing ones.
	54	*/
	55	struct l2tp_session_cfg {
f7faffa3	56	enum l2tp_pwtype pw_type;
95c96174	57	unsigned int data_seq:2; /* data sequencing level
fd558d18 JC	58	* 0 => none, 1 => IP only,
	59	* 2 => all
	60	*/
95c96174	61	unsigned int recv_seq:1; /* expect receive packets with
fd558d18	62	* sequence numbers? */
95c96174	63	unsigned int send_seq:1; /* send packets with sequence
fd558d18	64	* numbers? */
95c96174	65	unsigned int lns_mode:1; /* behave as LNS? LAC enables
fd558d18 JC	66	* sequence numbers under
	67	* control of LNS. */
	68	int debug; /* bitmask of debug message
	69	* categories */
309795f4	70	u16 vlan_id; /* VLAN pseudowire only */
f7faffa3 JC	71	u16 offset; /* offset to payload */
	72	u16 l2specific_len; /* Layer 2 specific length */
	73	u16 l2specific_type; /* Layer 2 specific type */
	74	u8 cookie[8]; /* optional cookie */
	75	int cookie_len; /* 0, 4 or 8 bytes */
	76	u8 peer_cookie[8]; /* peer's cookie */
	77	int peer_cookie_len; /* 0, 4 or 8 bytes */
fd558d18 JC	78	int reorder_timeout; /* configured reorder timeout
	79	* (in jiffies) */
	80	int mtu;
	81	int mru;
309795f4	82	char *ifname;
fd558d18 JC	83	};
	84
	85	struct l2tp_session {
	86	int magic; /* should be
	87	* L2TP_SESSION_MAGIC */
	88
	89	struct l2tp_tunnel tunnel; / back pointer to tunnel
	90	* context */
	91	u32 session_id;
	92	u32 peer_session_id;
f7faffa3 JC	93	u8 cookie[8];
	94	int cookie_len;
	95	u8 peer_cookie[8];
	96	int peer_cookie_len;
	97	u16 offset; /* offset from end of L2TP header
	98	to beginning of data */
	99	u16 l2specific_len;
	100	u16 l2specific_type;
	101	u16 hdr_len;
	102	u32 nr; /* session NR state (receive) */
	103	u32 ns; /* session NR state (send) */
fd558d18 JC	104	struct sk_buff_head reorder_q; /* receive reorder queue */
	105	struct hlist_node hlist; /* Hash list node */
	106	atomic_t ref_count;
	107
	108	char name[32]; /* for logging */
309795f4	109	char ifname[IFNAMSIZ];
95c96174	110	unsigned int data_seq:2; /* data sequencing level
fd558d18 JC	111	* 0 => none, 1 => IP only,
	112	* 2 => all
	113	*/
95c96174	114	unsigned int recv_seq:1; /* expect receive packets with
fd558d18	115	* sequence numbers? */
95c96174	116	unsigned int send_seq:1; /* send packets with sequence
fd558d18	117	* numbers? */
95c96174	118	unsigned int lns_mode:1; /* behave as LNS? LAC enables
fd558d18 JC	119	* sequence numbers under
	120	* control of LNS. */
	121	int debug; /* bitmask of debug message
	122	* categories */
	123	int reorder_timeout; /* configured reorder timeout
	124	* (in jiffies) */
38d40b3f	125	int reorder_skip; /* set if skip to next nr */
fd558d18 JC	126	int mtu;
fd558d18 JC	127	int mru;
f7faffa3	128	enum l2tp_pwtype pwtype;
fd558d18	129	struct l2tp_stats stats;
f7faffa3	130	struct hlist_node global_hlist; /* Global hash list node */
fd558d18	131
f7faffa3	132	int (build_header)(struct l2tp_session session, void *buf);
fd558d18 JC	133	void (recv_skb)(struct l2tp_session session, struct sk_buff *skb, int data_len);
	134	void (session_close)(struct l2tp_session session);
	135	void (ref)(struct l2tp_session session);
	136	void (deref)(struct l2tp_session session);
f66ef2d0	137	#if defined(CONFIG_L2TP_DEBUGFS) \|\| defined(CONFIG_L2TP_DEBUGFS_MODULE)
0ad66140 JC	138	void (show)(struct seq_file m, void *priv);
0ad66140 JC	139	#endif
fd558d18 JC	140	uint8_t priv[0]; /* private data */
	141	};
	142
	143	/* Describes the tunnel. It contains info to track all the associated
	144	* sessions so incoming packets can be sorted out
	145	*/
	146	struct l2tp_tunnel_cfg {
	147	int debug; /* bitmask of debug message
	148	* categories */
0d76751f	149	enum l2tp_encap_type encap;
789a4a2c JC	150
	151	/* Used only for kernel-created sockets */
	152	struct in_addr local_ip;
	153	struct in_addr peer_ip;
f9bac8df CE	154	#if IS_ENABLED(CONFIG_IPV6)
	155	struct in6_addr *local_ip6;
	156	struct in6_addr *peer_ip6;
	157	#endif
789a4a2c JC	158	u16 local_udp_port;
789a4a2c JC	159	u16 peer_udp_port;
7bddd0db	160	unsigned int use_udp_checksums:1;
fd558d18 JC	161	};
	162
	163	struct l2tp_tunnel {
	164	int magic; /* Should be L2TP_TUNNEL_MAGIC */
99469c32	165	struct rcu_head rcu;
fd558d18 JC	166	rwlock_t hlist_lock; /* protect session_hlist */
	167	struct hlist_head session_hlist[L2TP_HASH_SIZE];
	168	/* hashed list of sessions,
	169	* hashed by id */
	170	u32 tunnel_id;
	171	u32 peer_tunnel_id;
	172	int version; /* 2=>L2TPv2, 3=>L2TPv3 */
	173
	174	char name[20]; /* for logging */
	175	int debug; /* bitmask of debug message
	176	* categories */
0d76751f	177	enum l2tp_encap_type encap;
fd558d18 JC	178	struct l2tp_stats stats;
	179
	180	struct list_head list; /* Keep a list of all tunnels */
	181	struct net l2tp_net; / the net we belong to */
	182
	183	atomic_t ref_count;
0ad66140 JC	184	#ifdef CONFIG_DEBUG_FS
	185	void (show)(struct seq_file m, void *arg);
	186	#endif
fd558d18 JC	187	int (recv_payload_hook)(struct sk_buff skb);
	188	void (old_sk_destruct)(struct sock );
	189	struct sock sock; / Parent socket */
80d84ef3 TP	190	int fd; /* Parent fd, if tunnel socket
80d84ef3 TP	191	* was created by userspace */
bd83cd77 FC	192	#if IS_ENABLED(CONFIG_IPV6)
	193	bool v4mapped;
	194	#endif
fd558d18	195
f8ccac0e TP	196	struct work_struct del_work;
f8ccac0e TP	197
fd558d18 JC	198	uint8_t priv[0]; /* private data */
	199	};
	200
309795f4 JC	201	struct l2tp_nl_cmd_ops {
	202	int (session_create)(struct net net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
	203	int (session_delete)(struct l2tp_session session);
	204	};
	205
fd558d18 JC	206	static inline void l2tp_tunnel_priv(struct l2tp_tunnel tunnel)
	207	{
	208	return &tunnel->priv[0];
	209	}
	210
	211	static inline void l2tp_session_priv(struct l2tp_session session)
	212	{
	213	return &session->priv[0];
	214	}
	215
	216	static inline struct l2tp_tunnel l2tp_sock_to_tunnel(struct sock sk)
	217	{
	218	struct l2tp_tunnel *tunnel;
	219
	220	if (sk == NULL)
	221	return NULL;
	222
	223	sock_hold(sk);
	224	tunnel = (struct l2tp_tunnel *)(sk->sk_user_data);
	225	if (tunnel == NULL) {
	226	sock_put(sk);
	227	goto out;
	228	}
	229
	230	BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
	231
	232	out:
	233	return tunnel;
	234	}
	235
80d84ef3 TP	236	extern struct sock l2tp_tunnel_sock_lookup(struct l2tp_tunnel tunnel);
80d84ef3 TP	237	extern void l2tp_tunnel_sock_put(struct sock *sk);
f7faffa3	238	extern struct l2tp_session l2tp_session_find(struct net net, struct l2tp_tunnel *tunnel, u32 session_id);
43f8c8b0 GN	239	extern struct l2tp_session l2tp_session_get_nth(struct l2tp_tunnel tunnel, int nth,
43f8c8b0 GN	240	bool do_ref);
309795f4	241	extern struct l2tp_session l2tp_session_find_by_ifname(struct net net, char *ifname);
fd558d18 JC	242	extern struct l2tp_tunnel l2tp_tunnel_find(struct net net, u32 tunnel_id);
	243	extern struct l2tp_tunnel l2tp_tunnel_find_nth(struct net net, int nth);
	244
	245	extern 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);
e34f4c70	246	extern void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
309795f4	247	extern int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
fd558d18	248	extern 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);
f6e16b29	249	extern void __l2tp_session_unhash(struct l2tp_session *session);
309795f4	250	extern int l2tp_session_delete(struct l2tp_session *session);
fd558d18	251	extern void l2tp_session_free(struct l2tp_session *session);
f7faffa3	252	extern 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));
48f72f92	253	extern int l2tp_session_queue_purge(struct l2tp_session *session);
fd558d18 JC	254	extern int l2tp_udp_encap_recv(struct sock sk, struct sk_buff skb);
fd558d18 JC	255
fd558d18	256	extern int l2tp_xmit_skb(struct l2tp_session session, struct sk_buff skb, int hdr_len);
fd558d18	257
309795f4 JC	258	extern int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops);
309795f4 JC	259	extern void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
3d753377	260	int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
309795f4	261
fd558d18 JC	262	/* Session reference counts. Incremented when code obtains a reference
	263	* to a session.
	264	*/
	265	static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session)
	266	{
	267	atomic_inc(&session->ref_count);
	268	}
	269
	270	static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
	271	{
	272	if (atomic_dec_and_test(&session->ref_count))
	273	l2tp_session_free(session);
	274	}
	275
	276	#ifdef L2TP_REFCNT_DEBUG
a4ca44fa JP	277	#define l2tp_session_inc_refcount(_s) \
	278	do { \
	279	pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", \
	280	__func__, __LINE__, (_s)->name, \
	281	atomic_read(&_s->ref_count)); \
	282	l2tp_session_inc_refcount_1(_s); \
	283	} while (0)
	284	#define l2tp_session_dec_refcount(_s) \
	285	do { \
	286	pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", \
	287	__func__, __LINE__, (_s)->name, \
	288	atomic_read(&_s->ref_count)); \
	289	l2tp_session_dec_refcount_1(_s); \
	290	} while (0)
fd558d18 JC	291	#else
	292	#define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
	293	#define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
	294	#endif
	295
a4ca44fa JP	296	#define l2tp_printk(ptr, type, func, fmt, ...) \
	297	do { \
	298	if (((ptr)->debug) & (type)) \
	299	func(fmt, ##__VA_ARGS__); \
	300	} while (0)
	301
	302	#define l2tp_warn(ptr, type, fmt, ...) \
	303	l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
	304	#define l2tp_info(ptr, type, fmt, ...) \
	305	l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
	306	#define l2tp_dbg(ptr, type, fmt, ...) \
	307	l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
	308
fd558d18	309	#endif /* _L2TP_CORE_H_ */