[linux.git] / include / net / ax25.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *	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/refcount.h>
#include <net/neighbour.h>
#include <net/sock.h>
#include <linux/seq_file.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;
	refcount_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) \
	refcount_inc(&((ax25)->refcount))

static inline void ax25_uid_put(ax25_uid_assoc *assoc)
{
	if (refcount_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;
	refcount_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)
{
	refcount_inc(&ax25_rt->refcount);
}

void __ax25_put_route(ax25_route *ax25_rt);

extern rwlock_t ax25_route_lock;

static inline void ax25_route_lock_use(void)
{
	read_lock(&ax25_route_lock);
}

static inline void ax25_route_lock_unuse(void)
{
	read_unlock(&ax25_route_lock);
}

static inline void ax25_put_route(ax25_route *ax25_rt)
{
	if (refcount_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 */
	refcount_t		refcount;
} ax25_cb;

struct ax25_sock {
	struct sock		sk;
	struct ax25_cb		*cb;
};

static inline struct ax25_sock *ax25_sk(const struct sock *sk)
{
	return (struct ax25_sock *) sk;
}

static inline struct ax25_cb *sk_to_ax25(const struct sock *sk)
{
	return ax25_sk(sk)->cb;
}

#define ax25_for_each(__ax25, list) \
	hlist_for_each_entry(__ax25, list, ax25_node)

#define ax25_cb_hold(__ax25) \
	refcount_inc(&((__ax25)->refcount))

static __inline__ void ax25_cb_put(ax25_cb *ax25)
{
	if (refcount_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;

#if IS_ENABLED(CONFIG_AX25)
static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
{
	return dev->ax25_ptr;
}
#endif

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 */
netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
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 seq_operations ax25_rt_seqops;
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 seq_operations ax25_uid_seqops;
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
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* Declarations of AX.25 type objects.
	4	*
	5	* Alan Cox (GW4PTS) 10/11/93
	6	*/
	7	#ifndef _AX25_H
	8	#define _AX25_H
	9
1da177e4 LT	10	#include <linux/ax25.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/timer.h>
	13	#include <linux/list.h>
5a0e3ad6	14	#include <linux/slab.h>
07f2282f	15	#include <linux/refcount.h>
3b6a94be	16	#include <net/neighbour.h>
3200392b	17	#include <net/sock.h>
fddda2b7	18	#include <linux/seq_file.h>
1da177e4 LT	19
	20	#define AX25_T1CLAMPLO 1
	21	#define AX25_T1CLAMPHI (30 * HZ)
	22
	23	#define AX25_BPQ_HEADER_LEN 16
	24	#define AX25_KISS_HEADER_LEN 1
	25
	26	#define AX25_HEADER_LEN 17
	27	#define AX25_ADDR_LEN 7
	28	#define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN)
	29	#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
	30
	31	/* AX.25 Protocol IDs */
	32	#define AX25_P_ROSE 0x01
3bf0ae7b RB	33	#define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */
	34	/* Van Jacobsen (RFC 1144) */
	35	#define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */
	36	/* Van Jacobsen (RFC 1144) */
	37	#define AX25_P_SEGMENT 0x08 /* Segmentation fragment */
	38	#define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */
	39	#define AX25_P_LQ 0xc4 /* Link Quality Protocol */
	40	#define AX25_P_ATALK 0xca /* Appletalk */
	41	#define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */
	42	#define AX25_P_IP 0xcc /* ARPA Internet Protocol */
f4ab2f72	43	#define AX25_P_ARP 0xcd /* ARPA Address Resolution */
3bf0ae7b RB	44	#define AX25_P_FLEXNET 0xce /* FlexNet */
	45	#define AX25_P_NETROM 0xcf /* NET/ROM */
	46	#define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */
1da177e4 LT	47
	48	/* AX.25 Segment control values */
	49	#define AX25_SEG_REM 0x7F
	50	#define AX25_SEG_FIRST 0x80
	51
	52	#define AX25_CBIT 0x80 /* Command/Response bit */
	53	#define AX25_EBIT 0x01 /* HDLC Address Extension bit */
	54	#define AX25_HBIT 0x80 /* Has been repeated bit */
	55
	56	#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
	57	#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
	58	#define AX25_DAMA_FLAG 0x20 /* Well, it is NOT unused! (dl1bke 951121 */
	59
	60	#define AX25_COND_ACK_PENDING 0x01
	61	#define AX25_COND_REJECT 0x02
	62	#define AX25_COND_PEER_RX_BUSY 0x04
	63	#define AX25_COND_OWN_RX_BUSY 0x08
	64	#define AX25_COND_DAMA_MODE 0x10
	65
	66	#ifndef _LINUX_NETDEVICE_H
	67	#include <linux/netdevice.h>
	68	#endif
	69
	70	/* Upper sub-layer (LAPB) definitions */
	71
	72	/* Control field templates */
	73	#define AX25_I 0x00 /* Information frames */
	74	#define AX25_S 0x01 /* Supervisory frames */
	75	#define AX25_RR 0x01 /* Receiver ready */
	76	#define AX25_RNR 0x05 /* Receiver not ready */
	77	#define AX25_REJ 0x09 /* Reject */
	78	#define AX25_U 0x03 /* Unnumbered frames */
	79	#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
	80	#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
	81	#define AX25_DISC 0x43 /* Disconnect */
	82	#define AX25_DM 0x0f /* Disconnected mode */
	83	#define AX25_UA 0x63 /* Unnumbered acknowledge */
	84	#define AX25_FRMR 0x87 /* Frame reject */
	85	#define AX25_UI 0x03 /* Unnumbered information */
	86	#define AX25_XID 0xaf /* Exchange information */
	87	#define AX25_TEST 0xe3 /* Test */
	88
	89	#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
	90	#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
	91
	92	#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
	93
	94	#define AX25_POLLOFF 0
	95	#define AX25_POLLON 1
	96
	97	/* AX25 L2 C-bit */
	98	#define AX25_COMMAND 1
	99	#define AX25_RESPONSE 2
	100
	101	/* Define Link State constants. */
	102
	103	enum {
b01ef8ff RB	104	AX25_STATE_0, /* Listening */
	105	AX25_STATE_1, /* SABM sent */
	106	AX25_STATE_2, /* DISC sent */
	107	AX25_STATE_3, /* Established */
	108	AX25_STATE_4 /* Recovery */
1da177e4 LT	109	};
	110
	111	#define AX25_MODULUS 8 /* Standard AX.25 modulus */
	112	#define AX25_EMODULUS 128 /* Extended AX.25 modulus */
	113
	114	enum {
	115	AX25_PROTO_STD_SIMPLEX,
	116	AX25_PROTO_STD_DUPLEX,
c7c694d1	117	#ifdef CONFIG_AX25_DAMA_SLAVE
1da177e4	118	AX25_PROTO_DAMA_SLAVE,
c7c694d1 RB	119	#ifdef CONFIG_AX25_DAMA_MASTER
	120	AX25_PROTO_DAMA_MASTER,
	121	#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
	122	#endif
	123	#endif
	124	__AX25_PROTO_MAX,
	125	AX25_PROTO_MAX = __AX25_PROTO_MAX -1
1da177e4 LT	126	};
	127
	128	enum {
	129	AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
	130	AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
	131	AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
	132	AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
	133	AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
	134	AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
	135	AX25_VALUES_T1, /* Default T1 timeout value */
	136	AX25_VALUES_T2, /* Default T2 timeout value */
	137	AX25_VALUES_T3, /* Default T3 timeout value */
	138	AX25_VALUES_IDLE, /* Connected mode idle timer */
	139	AX25_VALUES_N2, /* Default N2 value */
	140	AX25_VALUES_PACLEN, /* AX.25 MTU */
	141	AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
	142	AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
	143	AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
	144	};
	145
	146	#define AX25_DEF_IPDEFMODE 0 /* Datagram */
	147	#define AX25_DEF_AXDEFMODE 0 /* Normal */
	148	#define AX25_DEF_BACKOFF 1 /* Linear backoff */
	149	#define AX25_DEF_CONMODE 2 /* Connected mode allowed */
	150	#define AX25_DEF_WINDOW 2 /* Window=2 */
	151	#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */
e1fdb5b3 RB	152	#define AX25_DEF_T1 10000 /* T1=10s */
	153	#define AX25_DEF_T2 3000 /* T2=3s */
	154	#define AX25_DEF_T3 300000 /* T3=300s */
1da177e4	155	#define AX25_DEF_N2 10 /* N2=10 */
e1fdb5b3	156	#define AX25_DEF_IDLE 0 /* Idle=None */
1da177e4 LT	157	#define AX25_DEF_PACLEN 256 /* Paclen=256 */
1da177e4 LT	158	#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */
e1fdb5b3	159	#define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */
1da177e4 LT	160
1da177e4 LT	161	typedef struct ax25_uid_assoc {
01d7dd0e	162	struct hlist_node uid_node;
07f2282f	163	refcount_t refcount;
d13fda85	164	kuid_t uid;
1da177e4 LT	165	ax25_address call;
	166	} ax25_uid_assoc;
	167
b67bfe0d SL	168	#define ax25_uid_for_each(__ax25, list) \
b67bfe0d SL	169	hlist_for_each_entry(__ax25, list, uid_node)
01d7dd0e RB	170
01d7dd0e RB	171	#define ax25_uid_hold(ax25) \
07f2282f	172	refcount_inc(&((ax25)->refcount))
01d7dd0e RB	173
	174	static inline void ax25_uid_put(ax25_uid_assoc *assoc)
	175	{
07f2282f	176	if (refcount_dec_and_test(&assoc->refcount)) {
01d7dd0e RB	177	kfree(assoc);
	178	}
	179	}
	180
1da177e4 LT	181	typedef struct {
	182	ax25_address calls[AX25_MAX_DIGIS];
	183	unsigned char repeated[AX25_MAX_DIGIS];
	184	unsigned char ndigi;
4595f251	185	signed char lastrepeat;
1da177e4 LT	186	} ax25_digi;
	187
	188	typedef struct ax25_route {
	189	struct ax25_route *next;
39f25d42	190	refcount_t refcount;
1da177e4 LT	191	ax25_address callsign;
	192	struct net_device *dev;
	193	ax25_digi *digipeat;
	194	char ip_mode;
1da177e4 LT	195	} ax25_route;
1da177e4 LT	196
006f68b8 RB	197	static inline void ax25_hold_route(ax25_route *ax25_rt)
006f68b8 RB	198	{
39f25d42	199	refcount_inc(&ax25_rt->refcount);
006f68b8 RB	200	}
006f68b8 RB	201
c1d8f804	202	void __ax25_put_route(ax25_route *ax25_rt);
006f68b8	203
63530aba ED	204	extern rwlock_t ax25_route_lock;
	205
	206	static inline void ax25_route_lock_use(void)
	207	{
	208	read_lock(&ax25_route_lock);
	209	}
	210
	211	static inline void ax25_route_lock_unuse(void)
	212	{
	213	read_unlock(&ax25_route_lock);
	214	}
	215
006f68b8 RB	216	static inline void ax25_put_route(ax25_route *ax25_rt)
006f68b8 RB	217	{
39f25d42	218	if (refcount_dec_and_test(&ax25_rt->refcount))
006f68b8 RB	219	__ax25_put_route(ax25_rt);
	220	}
	221
1da177e4 LT	222	typedef struct {
	223	char slave; /* slave_mode? */
	224	struct timer_list slave_timer; /* timeout timer */
	225	unsigned short slave_timeout; /* when? */
	226	} ax25_dama_info;
	227
	228	struct ctl_table;
	229
	230	typedef struct ax25_dev {
	231	struct ax25_dev *next;
	232	struct net_device *dev;
	233	struct net_device *forward;
0ca7a4c8	234	struct ctl_table_header *sysheader;
1da177e4 LT	235	int values[AX25_MAX_VALUES];
	236	#if defined(CONFIG_AX25_DAMA_SLAVE) \|\| defined(CONFIG_AX25_DAMA_MASTER)
	237	ax25_dama_info dama;
	238	#endif
	239	} ax25_dev;
	240
	241	typedef struct ax25_cb {
	242	struct hlist_node ax25_node;
	243	ax25_address source_addr, dest_addr;
	244	ax25_digi *digipeat;
	245	ax25_dev *ax25_dev;
	246	unsigned char iamdigi;
	247	unsigned char state, modulus, pidincl;
	248	unsigned short vs, vr, va;
	249	unsigned char condition, backoff;
	250	unsigned char n2, n2count;
	251	struct timer_list t1timer, t2timer, t3timer, idletimer;
	252	unsigned long t1, t2, t3, idle, rtt;
	253	unsigned short paclen, fragno, fraglen;
	254	struct sk_buff_head write_queue;
	255	struct sk_buff_head reseq_queue;
	256	struct sk_buff_head ack_queue;
	257	struct sk_buff_head frag_queue;
	258	unsigned char window;
	259	struct timer_list timer, dtimer;
	260	struct sock sk; / Backlink to socket */
b6d52ede	261	refcount_t refcount;
1da177e4 LT	262	} ax25_cb;
1da177e4 LT	263
3200392b DM	264	struct ax25_sock {
	265	struct sock sk;
	266	struct ax25_cb *cb;
	267	};
	268
	269	static inline struct ax25_sock ax25_sk(const struct sock sk)
	270	{
	271	return (struct ax25_sock *) sk;
	272	}
	273
	274	static inline struct ax25_cb sk_to_ax25(const struct sock sk)
	275	{
	276	return ax25_sk(sk)->cb;
	277	}
1da177e4	278
b67bfe0d SL	279	#define ax25_for_each(__ax25, list) \
b67bfe0d SL	280	hlist_for_each_entry(__ax25, list, ax25_node)
1da177e4 LT	281
1da177e4 LT	282	#define ax25_cb_hold(__ax25) \
b6d52ede	283	refcount_inc(&((__ax25)->refcount))
1da177e4 LT	284
	285	static __inline__ void ax25_cb_put(ax25_cb *ax25)
	286	{
b6d52ede	287	if (refcount_dec_and_test(&ax25->refcount)) {
b4558ea9	288	kfree(ax25->digipeat);
1da177e4 LT	289	kfree(ax25);
	290	}
	291	}
	292
f852640e	293	static inline __be16 ax25_type_trans(struct sk_buff skb, struct net_device dev)
56cb5156 ACM	294	{
56cb5156 ACM	295	skb->dev = dev;
459a98ed	296	skb_reset_mac_header(skb);
56cb5156	297	skb->pkt_type = PACKET_HOST;
56cb5156 ACM	298	return htons(ETH_P_AX25);
	299	}
	300
1da177e4 LT	301	/* af_ax25.c */
	302	extern struct hlist_head ax25_list;
	303	extern spinlock_t ax25_list_lock;
c1d8f804	304	void ax25_cb_add(ax25_cb *);
1da177e4 LT	305	struct sock ax25_find_listener(ax25_address , int, struct net_device *, int);
1da177e4 LT	306	struct sock ax25_get_socket(ax25_address , ax25_address *, int);
c1d8f804 JP	307	ax25_cb ax25_find_cb(ax25_address , ax25_address , ax25_digi ,
	308	struct net_device *);
	309	void ax25_send_to_raw(ax25_address , struct sk_buff , int);
	310	void ax25_destroy_socket(ax25_cb *);
	311	ax25_cb * __must_check ax25_create_cb(void);
	312	void ax25_fillin_cb(ax25_cb , ax25_dev );
	313	struct sock ax25_make_new(struct sock , struct ax25_dev *);
1da177e4 LT	314
1da177e4 LT	315	/* ax25_addr.c */
15b1c0e8 RB	316	extern const ax25_address ax25_bcast;
	317	extern const ax25_address ax25_defaddr;
	318	extern const ax25_address null_ax25_address;
c1d8f804 JP	319	char ax2asc(char buf, const ax25_address *);
	320	void asc2ax(ax25_address addr, const char callsign);
	321	int ax25cmp(const ax25_address , const ax25_address );
	322	int ax25digicmp(const ax25_digi , const ax25_digi );
	323	const unsigned char ax25_addr_parse(const unsigned char , int,
e8cc49bb	324	ax25_address , ax25_address , ax25_digi , int , int *);
c1d8f804 JP	325	int ax25_addr_build(unsigned char , const ax25_address ,
	326	const ax25_address , const ax25_digi , int, int);
	327	int ax25_addr_size(const ax25_digi *);
	328	void ax25_digi_invert(const ax25_digi , ax25_digi );
1da177e4 LT	329
	330	/* ax25_dev.c */
	331	extern ax25_dev *ax25_dev_list;
	332	extern spinlock_t ax25_dev_lock;
	333
19ff13f2	334	#if IS_ENABLED(CONFIG_AX25)
1da177e4 LT	335	static inline ax25_dev ax25_dev_ax25dev(struct net_device dev)
	336	{
	337	return dev->ax25_ptr;
	338	}
19ff13f2	339	#endif
1da177e4	340
c1d8f804 JP	341	ax25_dev ax25_addr_ax25dev(ax25_address );
	342	void ax25_dev_device_up(struct net_device *);
	343	void ax25_dev_device_down(struct net_device *);
	344	int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
	345	struct net_device ax25_fwd_dev(struct net_device );
	346	void ax25_dev_free(void);
1da177e4 LT	347
1da177e4 LT	348	/* ax25_ds_in.c */
c1d8f804	349	int ax25_ds_frame_in(ax25_cb , struct sk_buff , int);
1da177e4 LT	350
1da177e4 LT	351	/* ax25_ds_subr.c */
c1d8f804 JP	352	void ax25_ds_nr_error_recovery(ax25_cb *);
	353	void ax25_ds_enquiry_response(ax25_cb *);
	354	void ax25_ds_establish_data_link(ax25_cb *);
	355	void ax25_dev_dama_off(ax25_dev *);
	356	void ax25_dama_on(ax25_cb *);
	357	void ax25_dama_off(ax25_cb *);
1da177e4 LT	358
1da177e4 LT	359	/* ax25_ds_timer.c */
c1d8f804 JP	360	void ax25_ds_setup_timer(ax25_dev *);
	361	void ax25_ds_set_timer(ax25_dev *);
	362	void ax25_ds_del_timer(ax25_dev *);
	363	void ax25_ds_timer(ax25_cb *);
	364	void ax25_ds_t1_timeout(ax25_cb *);
	365	void ax25_ds_heartbeat_expiry(ax25_cb *);
	366	void ax25_ds_t3timer_expiry(ax25_cb *);
	367	void ax25_ds_idletimer_expiry(ax25_cb *);
1da177e4 LT	368
1da177e4 LT	369	/* ax25_iface.c */
8d5cf596 RB	370
	371	struct ax25_protocol {
	372	struct ax25_protocol *next;
	373	unsigned int pid;
	374	int (func)(struct sk_buff , ax25_cb *);
	375	};
	376
c1d8f804 JP	377	void ax25_register_pid(struct ax25_protocol *ap);
c1d8f804 JP	378	void ax25_protocol_release(unsigned int);
a4282717 RB	379
	380	struct ax25_linkfail {
	381	struct hlist_node lf_node;
	382	void (func)(ax25_cb , int);
	383	};
	384
c1d8f804 JP	385	void ax25_linkfail_register(struct ax25_linkfail *lf);
	386	void ax25_linkfail_release(struct ax25_linkfail *lf);
	387	int __must_check ax25_listen_register(ax25_address , struct net_device );
	388	void ax25_listen_release(ax25_address , struct net_device );
	389	int(ax25_protocol_function(unsigned int))(struct sk_buff , ax25_cb *);
	390	int ax25_listen_mine(ax25_address , struct net_device );
	391	void ax25_link_failed(ax25_cb *, int);
	392	int ax25_protocol_is_registered(unsigned int);
1da177e4 LT	393
1da177e4 LT	394	/* ax25_in.c */
c1d8f804 JP	395	int ax25_rx_iframe(ax25_cb , struct sk_buff );
	396	int ax25_kiss_rcv(struct sk_buff , struct net_device , struct packet_type *,
	397	struct net_device *);
1da177e4 LT	398
1da177e4 LT	399	/* ax25_ip.c */
1d5da757	400	netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
3b04ddde	401	extern const struct header_ops ax25_header_ops;
1da177e4 LT	402
1da177e4 LT	403	/* ax25_out.c */
c1d8f804 JP	404	ax25_cb ax25_send_frame(struct sk_buff , int, ax25_address , ax25_address ,
	405	ax25_digi , struct net_device );
	406	void ax25_output(ax25_cb , int, struct sk_buff );
	407	void ax25_kick(ax25_cb *);
	408	void ax25_transmit_buffer(ax25_cb , struct sk_buff , int);
	409	void ax25_queue_xmit(struct sk_buff skb, struct net_device dev);
	410	int ax25_check_iframes_acked(ax25_cb *, unsigned short);
1da177e4 LT	411
1da177e4 LT	412	/* ax25_route.c */
c1d8f804 JP	413	void ax25_rt_device_down(struct net_device *);
c1d8f804 JP	414	int ax25_rt_ioctl(unsigned int, void __user *);
fddda2b7	415	extern const struct seq_operations ax25_rt_seqops;
c1d8f804 JP	416	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev);
	417	int ax25_rt_autobind(ax25_cb , ax25_address );
	418	struct sk_buff ax25_rt_build_path(struct sk_buff , ax25_address *,
	419	ax25_address , ax25_digi );
	420	void ax25_rt_free(void);
1da177e4	421
1da177e4	422	/* ax25_std_in.c */
c1d8f804	423	int ax25_std_frame_in(ax25_cb , struct sk_buff , int);
1da177e4 LT	424
1da177e4 LT	425	/* ax25_std_subr.c */
c1d8f804 JP	426	void ax25_std_nr_error_recovery(ax25_cb *);
	427	void ax25_std_establish_data_link(ax25_cb *);
	428	void ax25_std_transmit_enquiry(ax25_cb *);
	429	void ax25_std_enquiry_response(ax25_cb *);
	430	void ax25_std_timeout_response(ax25_cb *);
1da177e4 LT	431
1da177e4 LT	432	/* ax25_std_timer.c */
c1d8f804 JP	433	void ax25_std_heartbeat_expiry(ax25_cb *);
	434	void ax25_std_t1timer_expiry(ax25_cb *);
	435	void ax25_std_t2timer_expiry(ax25_cb *);
	436	void ax25_std_t3timer_expiry(ax25_cb *);
	437	void ax25_std_idletimer_expiry(ax25_cb *);
1da177e4 LT	438
1da177e4 LT	439	/* ax25_subr.c */
c1d8f804 JP	440	void ax25_clear_queues(ax25_cb *);
	441	void ax25_frames_acked(ax25_cb *, unsigned short);
	442	void ax25_requeue_frames(ax25_cb *);
	443	int ax25_validate_nr(ax25_cb *, unsigned short);
	444	int ax25_decode(ax25_cb , struct sk_buff , int , int , int *);
	445	void ax25_send_control(ax25_cb *, int, int, int);
	446	void ax25_return_dm(struct net_device , ax25_address , ax25_address *,
	447	ax25_digi *);
	448	void ax25_calculate_t1(ax25_cb *);
	449	void ax25_calculate_rtt(ax25_cb *);
	450	void ax25_disconnect(ax25_cb *, int);
1da177e4 LT	451
1da177e4 LT	452	/* ax25_timer.c */
c1d8f804 JP	453	void ax25_setup_timers(ax25_cb *);
	454	void ax25_start_heartbeat(ax25_cb *);
	455	void ax25_start_t1timer(ax25_cb *);
	456	void ax25_start_t2timer(ax25_cb *);
	457	void ax25_start_t3timer(ax25_cb *);
	458	void ax25_start_idletimer(ax25_cb *);
	459	void ax25_stop_heartbeat(ax25_cb *);
	460	void ax25_stop_t1timer(ax25_cb *);
	461	void ax25_stop_t2timer(ax25_cb *);
	462	void ax25_stop_t3timer(ax25_cb *);
	463	void ax25_stop_idletimer(ax25_cb *);
	464	int ax25_t1timer_running(ax25_cb *);
	465	unsigned long ax25_display_timer(struct timer_list *);
1da177e4 LT	466
	467	/* ax25_uid.c */
	468	extern int ax25_uid_policy;
c1d8f804 JP	469	ax25_uid_assoc *ax25_findbyuid(kuid_t);
c1d8f804 JP	470	int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
fddda2b7	471	extern const struct seq_operations ax25_uid_seqops;
c1d8f804	472	void ax25_uid_free(void);
1da177e4 LT	473
	474	/* sysctl_net_ax25.c */
	475	#ifdef CONFIG_SYSCTL
c1d8f804 JP	476	int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
c1d8f804 JP	477	void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
1da177e4	478	#else
b9898507 EB	479	static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
b9898507 EB	480	static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
1da177e4 LT	481	#endif /* CONFIG_SYSCTL */
	482
	483	#endif