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Release 4.11 net/l2tp/l2tp_core.h

Directory: net/l2tp
/*
 * 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)

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 */
	
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 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 */
	
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]; }

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

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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; }

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James Chapman76100.00%1100.00%
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struct l2tp_session *l2tp_session_get(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id, bool do_ref); struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id); struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, bool do_ref); struct l2tp_session *l2tp_session_get_by_ifname(struct net *net, char *ifname, bool do_ref); struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id); struct l2tp_tunnel *l2tp_tunnel_find_nth(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); /* 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); }

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James Chapman20100.00%1100.00%
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static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session) { if (atomic_dec_and_test(&session->ref_count)) l2tp_session_free(session); }

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James Chapman27100.00%1100.00%
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#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__) #define MODULE_ALIAS_L2TP_PWTYPE(type) \ MODULE_ALIAS("net-l2tp-type-" __stringify(type)) #endif /* _L2TP_CORE_H_ */

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James Chapman106982.68%930.00%
Joe Perches624.80%13.33%
Guillaume Nault423.25%413.33%
Tom Parkin413.17%620.00%
Eric Dumazet251.93%310.00%
Chris Elston181.39%13.33%
François Cachereul110.85%13.33%
Stephen Hemminger80.62%13.33%
Tom Herbert80.62%13.33%
Dmitry Kozlov40.31%13.33%
David S. Miller40.31%13.33%
Javier Martinez Canillas10.08%13.33%
Total1293100.00%30100.00%
Directory: net/l2tp
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