/*
   *	Declarations of AX.25 type objects.
   *
   *	Alan Cox (GW4PTS) 	10/11/93
   */
  #ifndef _AX25_H
  #define _AX25_H 
  
  #include <linux/ax25.h>
  #include <linux/spinlock.h>
  #include <linux/timer.h>
  #include <linux/list.h>
  #include <linux/slab.h>
  #include <linux/atomic.h>
  
  #define	AX25_T1CLAMPLO  		1
  #define	AX25_T1CLAMPHI 			(30 * HZ)
  
  #define	AX25_BPQ_HEADER_LEN		16
  #define	AX25_KISS_HEADER_LEN		1
  
  #define	AX25_HEADER_LEN			17
  #define	AX25_ADDR_LEN			7
  #define	AX25_DIGI_HEADER_LEN		(AX25_MAX_DIGIS * AX25_ADDR_LEN)
  #define	AX25_MAX_HEADER_LEN		(AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
  
  /* AX.25 Protocol IDs */
  #define AX25_P_ROSE			0x01
  #define AX25_P_VJCOMP			0x06	/* Compressed TCP/IP packet   */
  						/* Van Jacobsen (RFC 1144)    */
  #define AX25_P_VJUNCOMP			0x07	/* Uncompressed TCP/IP packet */
  						/* Van Jacobsen (RFC 1144)    */
  #define	AX25_P_SEGMENT			0x08	/* Segmentation fragment      */
  #define AX25_P_TEXNET			0xc3	/* TEXTNET datagram protocol  */
  #define AX25_P_LQ			0xc4	/* Link Quality Protocol      */
  #define AX25_P_ATALK			0xca	/* Appletalk                  */
  #define AX25_P_ATALK_ARP		0xcb	/* Appletalk ARP              */
  #define AX25_P_IP			0xcc	/* ARPA Internet Protocol     */
  #define AX25_P_ARP			0xcd	/* ARPA Address Resolution    */
  #define AX25_P_FLEXNET			0xce	/* FlexNet                    */
  #define AX25_P_NETROM 			0xcf	/* NET/ROM                    */
  #define AX25_P_TEXT 			0xF0	/* No layer 3 protocol impl.  */
  
  /* AX.25 Segment control values */
  #define	AX25_SEG_REM			0x7F
  #define	AX25_SEG_FIRST			0x80
  
  #define AX25_CBIT			0x80	/* Command/Response bit */
  #define AX25_EBIT			0x01	/* HDLC Address Extension bit */
  #define AX25_HBIT			0x80	/* Has been repeated bit */
  
  #define AX25_SSSID_SPARE		0x60	/* Unused bits in SSID for standard AX.25 */
  #define AX25_ESSID_SPARE		0x20	/* Unused bits in SSID for extended AX.25 */
  #define AX25_DAMA_FLAG			0x20	/* Well, it is *NOT* unused! (dl1bke 951121 */
  
  #define	AX25_COND_ACK_PENDING		0x01
  #define	AX25_COND_REJECT		0x02
  #define	AX25_COND_PEER_RX_BUSY		0x04
  #define	AX25_COND_OWN_RX_BUSY		0x08
  #define	AX25_COND_DAMA_MODE		0x10
  
  #ifndef _LINUX_NETDEVICE_H
  #include <linux/netdevice.h>
  #endif
  
  /* Upper sub-layer (LAPB) definitions */
  
  /* Control field templates */
  #define	AX25_I			0x00	/* Information frames */
  #define	AX25_S			0x01	/* Supervisory frames */
  #define	AX25_RR			0x01	/* Receiver ready */
  #define	AX25_RNR		0x05	/* Receiver not ready */
  #define	AX25_REJ		0x09	/* Reject */
  #define	AX25_U			0x03	/* Unnumbered frames */
  #define	AX25_SABM		0x2f	/* Set Asynchronous Balanced Mode */
  #define	AX25_SABME		0x6f	/* Set Asynchronous Balanced Mode Extended */
  #define	AX25_DISC		0x43	/* Disconnect */
  #define	AX25_DM			0x0f	/* Disconnected mode */
  #define	AX25_UA			0x63	/* Unnumbered acknowledge */
  #define	AX25_FRMR		0x87	/* Frame reject */
  #define	AX25_UI			0x03	/* Unnumbered information */
  #define	AX25_XID		0xaf	/* Exchange information */
  #define	AX25_TEST		0xe3	/* Test */
  
  #define	AX25_PF			0x10	/* Poll/final bit for standard AX.25 */
  #define	AX25_EPF		0x01	/* Poll/final bit for extended AX.25 */
  
  #define AX25_ILLEGAL		0x100	/* Impossible to be a real frame type */
  
  #define	AX25_POLLOFF		0
  #define	AX25_POLLON		1
  
  /* AX25 L2 C-bit */
  #define AX25_COMMAND		1
  #define AX25_RESPONSE		2
  
  /* Define Link State constants. */
  
  enum { 
  	AX25_STATE_0,			/* Listening */
  	AX25_STATE_1,			/* SABM sent */
  	AX25_STATE_2,			/* DISC sent */
  	AX25_STATE_3,			/* Established */
  	AX25_STATE_4			/* Recovery */
  };
  
  #define AX25_MODULUS 		8	/*  Standard AX.25 modulus */
  #define	AX25_EMODULUS		128	/*  Extended AX.25 modulus */
  
  enum {
  	AX25_PROTO_STD_SIMPLEX,
  	AX25_PROTO_STD_DUPLEX,
  #ifdef CONFIG_AX25_DAMA_SLAVE
  	AX25_PROTO_DAMA_SLAVE,
  #ifdef CONFIG_AX25_DAMA_MASTER
  	AX25_PROTO_DAMA_MASTER,
  #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
  #endif
  #endif
  	__AX25_PROTO_MAX,
  	AX25_PROTO_MAX = __AX25_PROTO_MAX -1
  };
  
  enum {
  	AX25_VALUES_IPDEFMODE,	/* 0=DG 1=VC */
  	AX25_VALUES_AXDEFMODE,	/* 0=Normal 1=Extended Seq Nos */
  	AX25_VALUES_BACKOFF,	/* 0=None 1=Linear 2=Exponential */
  	AX25_VALUES_CONMODE,	/* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
  	AX25_VALUES_WINDOW,	/* Default window size for standard AX.25 */
  	AX25_VALUES_EWINDOW,	/* Default window size for extended AX.25 */
  	AX25_VALUES_T1,		/* Default T1 timeout value */
  	AX25_VALUES_T2,		/* Default T2 timeout value */
  	AX25_VALUES_T3,		/* Default T3 timeout value */
  	AX25_VALUES_IDLE,	/* Connected mode idle timer */
  	AX25_VALUES_N2,		/* Default N2 value */
  	AX25_VALUES_PACLEN,	/* AX.25 MTU */
  	AX25_VALUES_PROTOCOL,	/* Std AX.25, DAMA Slave, DAMA Master */
  	AX25_VALUES_DS_TIMEOUT,	/* DAMA Slave timeout */
  	AX25_MAX_VALUES		/* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
  };
  
  #define	AX25_DEF_IPDEFMODE	0			/* Datagram */
  #define	AX25_DEF_AXDEFMODE	0			/* Normal */
  #define	AX25_DEF_BACKOFF	1			/* Linear backoff */
  #define	AX25_DEF_CONMODE	2			/* Connected mode allowed */
  #define	AX25_DEF_WINDOW		2			/* Window=2 */
  #define	AX25_DEF_EWINDOW	32			/* Module-128 Window=32 */
  #define	AX25_DEF_T1		10000			/* T1=10s */
  #define	AX25_DEF_T2		3000			/* T2=3s  */
  #define	AX25_DEF_T3		300000			/* T3=300s */
  #define	AX25_DEF_N2		10			/* N2=10 */
  #define AX25_DEF_IDLE		0			/* Idle=None */
  #define AX25_DEF_PACLEN		256			/* Paclen=256 */
  #define	AX25_DEF_PROTOCOL	AX25_PROTO_STD_SIMPLEX	/* Standard AX.25 */
  #define AX25_DEF_DS_TIMEOUT	180000			/* DAMA timeout 3 minutes */
  
  typedef struct ax25_uid_assoc {
  	struct hlist_node	uid_node;
  	atomic_t		refcount;
  	kuid_t			uid;
  	ax25_address		call;
  } ax25_uid_assoc;
  
  #define ax25_uid_for_each(__ax25, list) \
  	hlist_for_each_entry(__ax25, list, uid_node)
  
  #define ax25_uid_hold(ax25) \
  	atomic_inc(&((ax25)->refcount))
  
  static inline void ax25_uid_put(ax25_uid_assoc *assoc)
  {
  	if (atomic_dec_and_test(&assoc->refcount)) {
  		kfree(assoc);
  	}
  }
  
  typedef struct {
  	ax25_address		calls[AX25_MAX_DIGIS];
  	unsigned char		repeated[AX25_MAX_DIGIS];
  	unsigned char		ndigi;
  	signed char		lastrepeat;
  } ax25_digi;
  
  typedef struct ax25_route {
  	struct ax25_route	*next;
  	atomic_t		refcount;
  	ax25_address		callsign;
  	struct net_device	*dev;
  	ax25_digi		*digipeat;
  	char			ip_mode;
  } ax25_route;
  
  static inline void ax25_hold_route(ax25_route *ax25_rt)
  {
  	atomic_inc(&ax25_rt->refcount);
  }
  
  void __ax25_put_route(ax25_route *ax25_rt);
  
  static inline void ax25_put_route(ax25_route *ax25_rt)
  {
  	if (atomic_dec_and_test(&ax25_rt->refcount))
  		__ax25_put_route(ax25_rt);
  }
  
  typedef struct {
  	char			slave;			/* slave_mode?   */
  	struct timer_list	slave_timer;		/* timeout timer */
  	unsigned short		slave_timeout;		/* when? */
  } ax25_dama_info;
  
  struct ctl_table;
  
  typedef struct ax25_dev {
  	struct ax25_dev		*next;
  	struct net_device	*dev;
  	struct net_device	*forward;
  	struct ctl_table_header *sysheader;
  	int			values[AX25_MAX_VALUES];
  #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
  	ax25_dama_info		dama;
  #endif
  } ax25_dev;
  
  typedef struct ax25_cb {
  	struct hlist_node	ax25_node;
  	ax25_address		source_addr, dest_addr;
  	ax25_digi		*digipeat;
  	ax25_dev		*ax25_dev;
  	unsigned char		iamdigi;
  	unsigned char		state, modulus, pidincl;
  	unsigned short		vs, vr, va;
  	unsigned char		condition, backoff;
  	unsigned char		n2, n2count;
  	struct timer_list	t1timer, t2timer, t3timer, idletimer;
  	unsigned long		t1, t2, t3, idle, rtt;
  	unsigned short		paclen, fragno, fraglen;
  	struct sk_buff_head	write_queue;
  	struct sk_buff_head	reseq_queue;
  	struct sk_buff_head	ack_queue;
  	struct sk_buff_head	frag_queue;
  	unsigned char		window;
  	struct timer_list	timer, dtimer;
  	struct sock		*sk;		/* Backlink to socket */
  	atomic_t		refcount;
  } ax25_cb;
  
  #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
  
  #define ax25_for_each(__ax25, list) \
  	hlist_for_each_entry(__ax25, list, ax25_node)
  
  #define ax25_cb_hold(__ax25) \
  	atomic_inc(&((__ax25)->refcount))
  
  static __inline__ void ax25_cb_put(ax25_cb *ax25)
  {
  	if (atomic_dec_and_test(&ax25->refcount)) {
  		kfree(ax25->digipeat);
  		kfree(ax25);
  	}
  }
  
  static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
  {
  	skb->dev      = dev;
  	skb_reset_mac_header(skb);
  	skb->pkt_type = PACKET_HOST;
  	return htons(ETH_P_AX25);
  }
  
  /* af_ax25.c */
  extern struct hlist_head ax25_list;
  extern spinlock_t ax25_list_lock;
  void ax25_cb_add(ax25_cb *);
  struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
  struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
  ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *,
  		      struct net_device *);
  void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
  void ax25_destroy_socket(ax25_cb *);
  ax25_cb * __must_check ax25_create_cb(void);
  void ax25_fillin_cb(ax25_cb *, ax25_dev *);
  struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
  
  /* ax25_addr.c */
  extern const ax25_address ax25_bcast;
  extern const ax25_address ax25_defaddr;
  extern const ax25_address null_ax25_address;
  char *ax2asc(char *buf, const ax25_address *);
  void asc2ax(ax25_address *addr, const char *callsign);
  int ax25cmp(const ax25_address *, const ax25_address *);
  int ax25digicmp(const ax25_digi *, const ax25_digi *);
  const unsigned char *ax25_addr_parse(const unsigned char *, int,
  	ax25_address *, ax25_address *, ax25_digi *, int *, int *);
  int ax25_addr_build(unsigned char *, const ax25_address *,
  		    const ax25_address *, const ax25_digi *, int, int);
  int ax25_addr_size(const ax25_digi *);
  void ax25_digi_invert(const ax25_digi *, ax25_digi *);
  
  /* ax25_dev.c */
  extern ax25_dev *ax25_dev_list;
  extern spinlock_t ax25_dev_lock;
  
  static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
  {
  	return dev->ax25_ptr;
  }
  
  ax25_dev *ax25_addr_ax25dev(ax25_address *);
  void ax25_dev_device_up(struct net_device *);
  void ax25_dev_device_down(struct net_device *);
  int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
  struct net_device *ax25_fwd_dev(struct net_device *);
  void ax25_dev_free(void);
  
  /* ax25_ds_in.c */
  int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
  
  /* ax25_ds_subr.c */
  void ax25_ds_nr_error_recovery(ax25_cb *);
  void ax25_ds_enquiry_response(ax25_cb *);
  void ax25_ds_establish_data_link(ax25_cb *);
  void ax25_dev_dama_off(ax25_dev *);
  void ax25_dama_on(ax25_cb *);
  void ax25_dama_off(ax25_cb *);
  
  /* ax25_ds_timer.c */
  void ax25_ds_setup_timer(ax25_dev *);
  void ax25_ds_set_timer(ax25_dev *);
  void ax25_ds_del_timer(ax25_dev *);
  void ax25_ds_timer(ax25_cb *);
  void ax25_ds_t1_timeout(ax25_cb *);
  void ax25_ds_heartbeat_expiry(ax25_cb *);
  void ax25_ds_t3timer_expiry(ax25_cb *);
  void ax25_ds_idletimer_expiry(ax25_cb *);
  
  /* ax25_iface.c */
  
  struct ax25_protocol {
  	struct ax25_protocol *next;
  	unsigned int pid;
  	int (*func)(struct sk_buff *, ax25_cb *);
  };
  
  void ax25_register_pid(struct ax25_protocol *ap);
  void ax25_protocol_release(unsigned int);
  
  struct ax25_linkfail {
  	struct hlist_node lf_node;
  	void (*func)(ax25_cb *, int);
  };
  
  void ax25_linkfail_register(struct ax25_linkfail *lf);
  void ax25_linkfail_release(struct ax25_linkfail *lf);
  int __must_check ax25_listen_register(ax25_address *, struct net_device *);
  void ax25_listen_release(ax25_address *, struct net_device *);
  int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
  int ax25_listen_mine(ax25_address *, struct net_device *);
  void ax25_link_failed(ax25_cb *, int);
  int ax25_protocol_is_registered(unsigned int);
  
  /* ax25_in.c */
  int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
  int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
  		  struct net_device *);
  
  /* ax25_ip.c */
  int ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short,
  		     const void *, const void *, unsigned int);
  int ax25_rebuild_header(struct sk_buff *);
  extern const struct header_ops ax25_header_ops;
  
  /* ax25_out.c */
  ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
  			 ax25_digi *, struct net_device *);
  void ax25_output(ax25_cb *, int, struct sk_buff *);
  void ax25_kick(ax25_cb *);
  void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
  void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
  int ax25_check_iframes_acked(ax25_cb *, unsigned short);
  
  /* ax25_route.c */
  void ax25_rt_device_down(struct net_device *);
  int ax25_rt_ioctl(unsigned int, void __user *);
  extern const struct file_operations ax25_route_fops;
  ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
  int ax25_rt_autobind(ax25_cb *, ax25_address *);
  struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *,
  				   ax25_address *, ax25_digi *);
  void ax25_rt_free(void);
  
  /* ax25_std_in.c */
  int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
  
  /* ax25_std_subr.c */
  void ax25_std_nr_error_recovery(ax25_cb *);
  void ax25_std_establish_data_link(ax25_cb *);
  void ax25_std_transmit_enquiry(ax25_cb *);
  void ax25_std_enquiry_response(ax25_cb *);
  void ax25_std_timeout_response(ax25_cb *);
  
  /* ax25_std_timer.c */
  void ax25_std_heartbeat_expiry(ax25_cb *);
  void ax25_std_t1timer_expiry(ax25_cb *);
  void ax25_std_t2timer_expiry(ax25_cb *);
  void ax25_std_t3timer_expiry(ax25_cb *);
  void ax25_std_idletimer_expiry(ax25_cb *);
  
  /* ax25_subr.c */
  void ax25_clear_queues(ax25_cb *);
  void ax25_frames_acked(ax25_cb *, unsigned short);
  void ax25_requeue_frames(ax25_cb *);
  int ax25_validate_nr(ax25_cb *, unsigned short);
  int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
  void ax25_send_control(ax25_cb *, int, int, int);
  void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *,
  		    ax25_digi *);
  void ax25_calculate_t1(ax25_cb *);
  void ax25_calculate_rtt(ax25_cb *);
  void ax25_disconnect(ax25_cb *, int);
  
  /* ax25_timer.c */
  void ax25_setup_timers(ax25_cb *);
  void ax25_start_heartbeat(ax25_cb *);
  void ax25_start_t1timer(ax25_cb *);
  void ax25_start_t2timer(ax25_cb *);
  void ax25_start_t3timer(ax25_cb *);
  void ax25_start_idletimer(ax25_cb *);
  void ax25_stop_heartbeat(ax25_cb *);
  void ax25_stop_t1timer(ax25_cb *);
  void ax25_stop_t2timer(ax25_cb *);
  void ax25_stop_t3timer(ax25_cb *);
  void ax25_stop_idletimer(ax25_cb *);
  int ax25_t1timer_running(ax25_cb *);
  unsigned long ax25_display_timer(struct timer_list *);
  
  /* ax25_uid.c */
  extern int  ax25_uid_policy;
  ax25_uid_assoc *ax25_findbyuid(kuid_t);
  int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
  extern const struct file_operations ax25_uid_fops;
  void ax25_uid_free(void);
  
  /* sysctl_net_ax25.c */
  #ifdef CONFIG_SYSCTL
  int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
  void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
  #else
  static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
  static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
  #endif /* CONFIG_SYSCTL */
  
  #endif