include/net/ax25.h - linux - Git at Google

 /*
  *	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 <asm/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;
 	uid_t			uid;
 	ax25_address		call;
 } ax25_uid_assoc;

 #define ax25_uid_for_each(__ax25, node, list) \
 	hlist_for_each_entry(__ax25, node, 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);
 }

 extern 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	*systable;
 	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, node, list) \
 	hlist_for_each_entry(__ax25, node, 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;
 extern 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);
 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
 extern void ax25_destroy_socket(ax25_cb *);
 extern ax25_cb * __must_check ax25_create_cb(void);
 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
 extern 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;
 extern char *ax2asc(char *buf, const ax25_address *);
 extern void asc2ax(ax25_address *addr, const char *callsign);
 extern int ax25cmp(const ax25_address *, const ax25_address *);
 extern int ax25digicmp(const ax25_digi *, const ax25_digi *);
 extern const unsigned char *ax25_addr_parse(const unsigned char *, int,
 	ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 extern int  ax25_addr_build(unsigned char *, const ax25_address *,
 	const ax25_address *, const ax25_digi *, int, int);
 extern int  ax25_addr_size(const ax25_digi *);
 extern 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;
 }

 extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
 extern void ax25_dev_device_up(struct net_device *);
 extern void ax25_dev_device_down(struct net_device *);
 extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
 extern struct net_device *ax25_fwd_dev(struct net_device *);
 extern void ax25_dev_free(void);

 /* ax25_ds_in.c */
 extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);

 /* ax25_ds_subr.c */
 extern void ax25_ds_nr_error_recovery(ax25_cb *);
 extern void ax25_ds_enquiry_response(ax25_cb *);
 extern void ax25_ds_establish_data_link(ax25_cb *);
 extern void ax25_dev_dama_off(ax25_dev *);
 extern void ax25_dama_on(ax25_cb *);
 extern void ax25_dama_off(ax25_cb *);

 /* ax25_ds_timer.c */
 extern void ax25_ds_setup_timer(ax25_dev *);
 extern void ax25_ds_set_timer(ax25_dev *);
 extern void ax25_ds_del_timer(ax25_dev *);
 extern void ax25_ds_timer(ax25_cb *);
 extern void ax25_ds_t1_timeout(ax25_cb *);
 extern void ax25_ds_heartbeat_expiry(ax25_cb *);
 extern void ax25_ds_t3timer_expiry(ax25_cb *);
 extern 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 *);
 };

 extern void ax25_register_pid(struct ax25_protocol *ap);
 extern void ax25_protocol_release(unsigned int);

 struct ax25_linkfail {
 	struct hlist_node lf_node;
 	void (*func)(ax25_cb *, int);
 };

 extern void ax25_linkfail_register(struct ax25_linkfail *lf);
 extern void ax25_linkfail_release(struct ax25_linkfail *lf);
 extern int __must_check ax25_listen_register(ax25_address *,
 	struct net_device *);
 extern void ax25_listen_release(ax25_address *, struct net_device *);
 extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
 extern int  ax25_listen_mine(ax25_address *, struct net_device *);
 extern void ax25_link_failed(ax25_cb *, int);
 extern int  ax25_protocol_is_registered(unsigned int);

 /* ax25_in.c */
 extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);

 /* ax25_ip.c */
 extern int ax25_hard_header(struct sk_buff *, struct net_device *,
 			    unsigned short, const void *,
 			    const void *, unsigned int);
 extern int  ax25_rebuild_header(struct sk_buff *);
 extern const struct header_ops ax25_header_ops;

 /* ax25_out.c */
 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 extern void ax25_output(ax25_cb *, int, struct sk_buff *);
 extern void ax25_kick(ax25_cb *);
 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);

 /* ax25_route.c */
 extern void ax25_rt_device_down(struct net_device *);
 extern int  ax25_rt_ioctl(unsigned int, void __user *);
 extern const struct file_operations ax25_route_fops;
 extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
 extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
 extern void ax25_rt_free(void);

 /* ax25_std_in.c */
 extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);

 /* ax25_std_subr.c */
 extern void ax25_std_nr_error_recovery(ax25_cb *);
 extern void ax25_std_establish_data_link(ax25_cb *);
 extern void ax25_std_transmit_enquiry(ax25_cb *);
 extern void ax25_std_enquiry_response(ax25_cb *);
 extern void ax25_std_timeout_response(ax25_cb *);

 /* ax25_std_timer.c */
 extern void ax25_std_heartbeat_expiry(ax25_cb *);
 extern void ax25_std_t1timer_expiry(ax25_cb *);
 extern void ax25_std_t2timer_expiry(ax25_cb *);
 extern void ax25_std_t3timer_expiry(ax25_cb *);
 extern void ax25_std_idletimer_expiry(ax25_cb *);

 /* ax25_subr.c */
 extern void ax25_clear_queues(ax25_cb *);
 extern void ax25_frames_acked(ax25_cb *, unsigned short);
 extern void ax25_requeue_frames(ax25_cb *);
 extern int  ax25_validate_nr(ax25_cb *, unsigned short);
 extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
 extern void ax25_send_control(ax25_cb *, int, int, int);
 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
 extern void ax25_calculate_t1(ax25_cb *);
 extern void ax25_calculate_rtt(ax25_cb *);
 extern void ax25_disconnect(ax25_cb *, int);

 /* ax25_timer.c */
 extern void ax25_setup_timers(ax25_cb *);
 extern void ax25_start_heartbeat(ax25_cb *);
 extern void ax25_start_t1timer(ax25_cb *);
 extern void ax25_start_t2timer(ax25_cb *);
 extern void ax25_start_t3timer(ax25_cb *);
 extern void ax25_start_idletimer(ax25_cb *);
 extern void ax25_stop_heartbeat(ax25_cb *);
 extern void ax25_stop_t1timer(ax25_cb *);
 extern void ax25_stop_t2timer(ax25_cb *);
 extern void ax25_stop_t3timer(ax25_cb *);
 extern void ax25_stop_idletimer(ax25_cb *);
 extern int  ax25_t1timer_running(ax25_cb *);
 extern unsigned long ax25_display_timer(struct timer_list *);

 /* ax25_uid.c */
 extern int  ax25_uid_policy;
 extern ax25_uid_assoc *ax25_findbyuid(uid_t);
 extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
 extern const struct file_operations ax25_uid_fops;
 extern void ax25_uid_free(void);

 /* sysctl_net_ax25.c */
 #ifdef CONFIG_SYSCTL
 extern void ax25_register_sysctl(void);
 extern void ax25_unregister_sysctl(void);
 #else
 static inline void ax25_register_sysctl(void) {};
 static inline void ax25_unregister_sysctl(void) {};
 #endif /* CONFIG_SYSCTL */

 #endif
	/*
	* 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 <asm/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;
	uid_t uid;
	ax25_address call;
	} ax25_uid_assoc;

	#define ax25_uid_for_each(__ax25, node, list) \
	hlist_for_each_entry(__ax25, node, 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);
	}

	extern 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 *systable;
	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, node, list) \
	hlist_for_each_entry(__ax25, node, 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;
	extern 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);
	extern ax25_cb ax25_find_cb(ax25_address , ax25_address , ax25_digi , struct net_device *);
	extern void ax25_send_to_raw(ax25_address , struct sk_buff , int);
	extern void ax25_destroy_socket(ax25_cb *);
	extern ax25_cb * __must_check ax25_create_cb(void);
	extern void ax25_fillin_cb(ax25_cb , ax25_dev );
	extern 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;
	extern char ax2asc(char buf, const ax25_address *);
	extern void asc2ax(ax25_address addr, const char callsign);
	extern int ax25cmp(const ax25_address , const ax25_address );
	extern int ax25digicmp(const ax25_digi , const ax25_digi );
	extern const unsigned char ax25_addr_parse(const unsigned char , int,
	ax25_address , ax25_address , ax25_digi , int , int *);
	extern int ax25_addr_build(unsigned char , const ax25_address ,
	const ax25_address , const ax25_digi , int, int);
	extern int ax25_addr_size(const ax25_digi *);
	extern 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;
	}

	extern ax25_dev ax25_addr_ax25dev(ax25_address );
	extern void ax25_dev_device_up(struct net_device *);
	extern void ax25_dev_device_down(struct net_device *);
	extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
	extern struct net_device ax25_fwd_dev(struct net_device );
	extern void ax25_dev_free(void);

	/* ax25_ds_in.c */
	extern int ax25_ds_frame_in(ax25_cb , struct sk_buff , int);

	/* ax25_ds_subr.c */
	extern void ax25_ds_nr_error_recovery(ax25_cb *);
	extern void ax25_ds_enquiry_response(ax25_cb *);
	extern void ax25_ds_establish_data_link(ax25_cb *);
	extern void ax25_dev_dama_off(ax25_dev *);
	extern void ax25_dama_on(ax25_cb *);
	extern void ax25_dama_off(ax25_cb *);

	/* ax25_ds_timer.c */
	extern void ax25_ds_setup_timer(ax25_dev *);
	extern void ax25_ds_set_timer(ax25_dev *);
	extern void ax25_ds_del_timer(ax25_dev *);
	extern void ax25_ds_timer(ax25_cb *);
	extern void ax25_ds_t1_timeout(ax25_cb *);
	extern void ax25_ds_heartbeat_expiry(ax25_cb *);
	extern void ax25_ds_t3timer_expiry(ax25_cb *);
	extern 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 *);
	};

	extern void ax25_register_pid(struct ax25_protocol *ap);
	extern void ax25_protocol_release(unsigned int);

	struct ax25_linkfail {
	struct hlist_node lf_node;
	void (func)(ax25_cb , int);
	};

	extern void ax25_linkfail_register(struct ax25_linkfail *lf);
	extern void ax25_linkfail_release(struct ax25_linkfail *lf);
	extern int __must_check ax25_listen_register(ax25_address *,
	struct net_device *);
	extern void ax25_listen_release(ax25_address , struct net_device );
	extern int (ax25_protocol_function(unsigned int))(struct sk_buff , ax25_cb *);
	extern int ax25_listen_mine(ax25_address , struct net_device );
	extern void ax25_link_failed(ax25_cb *, int);
	extern int ax25_protocol_is_registered(unsigned int);

	/* ax25_in.c */
	extern int ax25_rx_iframe(ax25_cb , struct sk_buff );
	extern int ax25_kiss_rcv(struct sk_buff , struct net_device , struct packet_type , struct net_device );

	/* ax25_ip.c */
	extern int ax25_hard_header(struct sk_buff , struct net_device ,
	unsigned short, const void *,
	const void *, unsigned int);
	extern int ax25_rebuild_header(struct sk_buff *);
	extern const struct header_ops ax25_header_ops;

	/* ax25_out.c */
	extern ax25_cb ax25_send_frame(struct sk_buff , int, ax25_address , ax25_address , ax25_digi , struct net_device );
	extern void ax25_output(ax25_cb , int, struct sk_buff );
	extern void ax25_kick(ax25_cb *);
	extern void ax25_transmit_buffer(ax25_cb , struct sk_buff , int);
	extern void ax25_queue_xmit(struct sk_buff skb, struct net_device dev);
	extern int ax25_check_iframes_acked(ax25_cb *, unsigned short);

	/* ax25_route.c */
	extern void ax25_rt_device_down(struct net_device *);
	extern int ax25_rt_ioctl(unsigned int, void __user *);
	extern const struct file_operations ax25_route_fops;
	extern ax25_route ax25_get_route(ax25_address addr, struct net_device *dev);
	extern int ax25_rt_autobind(ax25_cb , ax25_address );
	extern struct sk_buff ax25_rt_build_path(struct sk_buff , ax25_address , ax25_address , ax25_digi *);
	extern void ax25_rt_free(void);

	/* ax25_std_in.c */
	extern int ax25_std_frame_in(ax25_cb , struct sk_buff , int);

	/* ax25_std_subr.c */
	extern void ax25_std_nr_error_recovery(ax25_cb *);
	extern void ax25_std_establish_data_link(ax25_cb *);
	extern void ax25_std_transmit_enquiry(ax25_cb *);
	extern void ax25_std_enquiry_response(ax25_cb *);
	extern void ax25_std_timeout_response(ax25_cb *);

	/* ax25_std_timer.c */
	extern void ax25_std_heartbeat_expiry(ax25_cb *);
	extern void ax25_std_t1timer_expiry(ax25_cb *);
	extern void ax25_std_t2timer_expiry(ax25_cb *);
	extern void ax25_std_t3timer_expiry(ax25_cb *);
	extern void ax25_std_idletimer_expiry(ax25_cb *);

	/* ax25_subr.c */
	extern void ax25_clear_queues(ax25_cb *);
	extern void ax25_frames_acked(ax25_cb *, unsigned short);
	extern void ax25_requeue_frames(ax25_cb *);
	extern int ax25_validate_nr(ax25_cb *, unsigned short);
	extern int ax25_decode(ax25_cb , struct sk_buff , int , int , int *);
	extern void ax25_send_control(ax25_cb *, int, int, int);
	extern void ax25_return_dm(struct net_device , ax25_address , ax25_address , ax25_digi );
	extern void ax25_calculate_t1(ax25_cb *);
	extern void ax25_calculate_rtt(ax25_cb *);
	extern void ax25_disconnect(ax25_cb *, int);

	/* ax25_timer.c */
	extern void ax25_setup_timers(ax25_cb *);
	extern void ax25_start_heartbeat(ax25_cb *);
	extern void ax25_start_t1timer(ax25_cb *);
	extern void ax25_start_t2timer(ax25_cb *);
	extern void ax25_start_t3timer(ax25_cb *);
	extern void ax25_start_idletimer(ax25_cb *);
	extern void ax25_stop_heartbeat(ax25_cb *);
	extern void ax25_stop_t1timer(ax25_cb *);
	extern void ax25_stop_t2timer(ax25_cb *);
	extern void ax25_stop_t3timer(ax25_cb *);
	extern void ax25_stop_idletimer(ax25_cb *);
	extern int ax25_t1timer_running(ax25_cb *);
	extern unsigned long ax25_display_timer(struct timer_list *);

	/* ax25_uid.c */
	extern int ax25_uid_policy;
	extern ax25_uid_assoc *ax25_findbyuid(uid_t);
	extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
	extern const struct file_operations ax25_uid_fops;
	extern void ax25_uid_free(void);

	/* sysctl_net_ax25.c */
	#ifdef CONFIG_SYSCTL
	extern void ax25_register_sysctl(void);
	extern void ax25_unregister_sysctl(void);
	#else
	static inline void ax25_register_sysctl(void) {};
	static inline void ax25_unregister_sysctl(void) {};
	#endif /* CONFIG_SYSCTL */

	#endif