[mirror_ubuntu-bionic-kernel.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>

#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;

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 */
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 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
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>
1da177e4 LT	18
	19	#define AX25_T1CLAMPLO 1
	20	#define AX25_T1CLAMPHI (30 * HZ)
	21
	22	#define AX25_BPQ_HEADER_LEN 16
	23	#define AX25_KISS_HEADER_LEN 1
	24
	25	#define AX25_HEADER_LEN 17
	26	#define AX25_ADDR_LEN 7
	27	#define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN)
	28	#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
	29
	30	/* AX.25 Protocol IDs */
	31	#define AX25_P_ROSE 0x01
3bf0ae7b RB	32	#define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */
	33	/* Van Jacobsen (RFC 1144) */
	34	#define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */
	35	/* Van Jacobsen (RFC 1144) */
	36	#define AX25_P_SEGMENT 0x08 /* Segmentation fragment */
	37	#define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */
	38	#define AX25_P_LQ 0xc4 /* Link Quality Protocol */
	39	#define AX25_P_ATALK 0xca /* Appletalk */
	40	#define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */
	41	#define AX25_P_IP 0xcc /* ARPA Internet Protocol */
f4ab2f72	42	#define AX25_P_ARP 0xcd /* ARPA Address Resolution */
3bf0ae7b RB	43	#define AX25_P_FLEXNET 0xce /* FlexNet */
	44	#define AX25_P_NETROM 0xcf /* NET/ROM */
	45	#define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */
1da177e4 LT	46
	47	/* AX.25 Segment control values */
	48	#define AX25_SEG_REM 0x7F
	49	#define AX25_SEG_FIRST 0x80
	50
	51	#define AX25_CBIT 0x80 /* Command/Response bit */
	52	#define AX25_EBIT 0x01 /* HDLC Address Extension bit */
	53	#define AX25_HBIT 0x80 /* Has been repeated bit */
	54
	55	#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
	56	#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
	57	#define AX25_DAMA_FLAG 0x20 /* Well, it is NOT unused! (dl1bke 951121 */
	58
	59	#define AX25_COND_ACK_PENDING 0x01
	60	#define AX25_COND_REJECT 0x02
	61	#define AX25_COND_PEER_RX_BUSY 0x04
	62	#define AX25_COND_OWN_RX_BUSY 0x08
	63	#define AX25_COND_DAMA_MODE 0x10
	64
	65	#ifndef _LINUX_NETDEVICE_H
	66	#include <linux/netdevice.h>
	67	#endif
	68
	69	/* Upper sub-layer (LAPB) definitions */
	70
	71	/* Control field templates */
	72	#define AX25_I 0x00 /* Information frames */
	73	#define AX25_S 0x01 /* Supervisory frames */
	74	#define AX25_RR 0x01 /* Receiver ready */
	75	#define AX25_RNR 0x05 /* Receiver not ready */
	76	#define AX25_REJ 0x09 /* Reject */
	77	#define AX25_U 0x03 /* Unnumbered frames */
	78	#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
	79	#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
	80	#define AX25_DISC 0x43 /* Disconnect */
	81	#define AX25_DM 0x0f /* Disconnected mode */
	82	#define AX25_UA 0x63 /* Unnumbered acknowledge */
	83	#define AX25_FRMR 0x87 /* Frame reject */
	84	#define AX25_UI 0x03 /* Unnumbered information */
	85	#define AX25_XID 0xaf /* Exchange information */
	86	#define AX25_TEST 0xe3 /* Test */
	87
	88	#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
	89	#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
	90
	91	#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
	92
	93	#define AX25_POLLOFF 0
	94	#define AX25_POLLON 1
	95
	96	/* AX25 L2 C-bit */
	97	#define AX25_COMMAND 1
	98	#define AX25_RESPONSE 2
	99
	100	/* Define Link State constants. */
	101
	102	enum {
b01ef8ff RB	103	AX25_STATE_0, /* Listening */
	104	AX25_STATE_1, /* SABM sent */
	105	AX25_STATE_2, /* DISC sent */
	106	AX25_STATE_3, /* Established */
	107	AX25_STATE_4 /* Recovery */
1da177e4 LT	108	};
	109
	110	#define AX25_MODULUS 8 /* Standard AX.25 modulus */
	111	#define AX25_EMODULUS 128 /* Extended AX.25 modulus */
	112
	113	enum {
	114	AX25_PROTO_STD_SIMPLEX,
	115	AX25_PROTO_STD_DUPLEX,
c7c694d1	116	#ifdef CONFIG_AX25_DAMA_SLAVE
1da177e4	117	AX25_PROTO_DAMA_SLAVE,
c7c694d1 RB	118	#ifdef CONFIG_AX25_DAMA_MASTER
	119	AX25_PROTO_DAMA_MASTER,
	120	#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
	121	#endif
	122	#endif
	123	__AX25_PROTO_MAX,
	124	AX25_PROTO_MAX = __AX25_PROTO_MAX -1
1da177e4 LT	125	};
	126
	127	enum {
	128	AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
	129	AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
	130	AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
	131	AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
	132	AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
	133	AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
	134	AX25_VALUES_T1, /* Default T1 timeout value */
	135	AX25_VALUES_T2, /* Default T2 timeout value */
	136	AX25_VALUES_T3, /* Default T3 timeout value */
	137	AX25_VALUES_IDLE, /* Connected mode idle timer */
	138	AX25_VALUES_N2, /* Default N2 value */
	139	AX25_VALUES_PACLEN, /* AX.25 MTU */
	140	AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
	141	AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
	142	AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
	143	};
	144
	145	#define AX25_DEF_IPDEFMODE 0 /* Datagram */
	146	#define AX25_DEF_AXDEFMODE 0 /* Normal */
	147	#define AX25_DEF_BACKOFF 1 /* Linear backoff */
	148	#define AX25_DEF_CONMODE 2 /* Connected mode allowed */
	149	#define AX25_DEF_WINDOW 2 /* Window=2 */
	150	#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */
e1fdb5b3 RB	151	#define AX25_DEF_T1 10000 /* T1=10s */
	152	#define AX25_DEF_T2 3000 /* T2=3s */
	153	#define AX25_DEF_T3 300000 /* T3=300s */
1da177e4	154	#define AX25_DEF_N2 10 /* N2=10 */
e1fdb5b3	155	#define AX25_DEF_IDLE 0 /* Idle=None */
1da177e4 LT	156	#define AX25_DEF_PACLEN 256 /* Paclen=256 */
1da177e4 LT	157	#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */
e1fdb5b3	158	#define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */
1da177e4 LT	159
1da177e4 LT	160	typedef struct ax25_uid_assoc {
01d7dd0e	161	struct hlist_node uid_node;
07f2282f	162	refcount_t refcount;
d13fda85	163	kuid_t uid;
1da177e4 LT	164	ax25_address call;
	165	} ax25_uid_assoc;
	166
b67bfe0d SL	167	#define ax25_uid_for_each(__ax25, list) \
b67bfe0d SL	168	hlist_for_each_entry(__ax25, list, uid_node)
01d7dd0e RB	169
01d7dd0e RB	170	#define ax25_uid_hold(ax25) \
07f2282f	171	refcount_inc(&((ax25)->refcount))
01d7dd0e RB	172
	173	static inline void ax25_uid_put(ax25_uid_assoc *assoc)
	174	{
07f2282f	175	if (refcount_dec_and_test(&assoc->refcount)) {
01d7dd0e RB	176	kfree(assoc);
	177	}
	178	}
	179
1da177e4 LT	180	typedef struct {
	181	ax25_address calls[AX25_MAX_DIGIS];
	182	unsigned char repeated[AX25_MAX_DIGIS];
	183	unsigned char ndigi;
4595f251	184	signed char lastrepeat;
1da177e4 LT	185	} ax25_digi;
	186
	187	typedef struct ax25_route {
	188	struct ax25_route *next;
39f25d42	189	refcount_t refcount;
1da177e4 LT	190	ax25_address callsign;
	191	struct net_device *dev;
	192	ax25_digi *digipeat;
	193	char ip_mode;
1da177e4 LT	194	} ax25_route;
1da177e4 LT	195
006f68b8 RB	196	static inline void ax25_hold_route(ax25_route *ax25_rt)
006f68b8 RB	197	{
39f25d42	198	refcount_inc(&ax25_rt->refcount);
006f68b8 RB	199	}
006f68b8 RB	200
c1d8f804	201	void __ax25_put_route(ax25_route *ax25_rt);
006f68b8	202
7bf94d32 ED	203	extern rwlock_t ax25_route_lock;
	204
	205	static inline void ax25_route_lock_use(void)
	206	{
	207	read_lock(&ax25_route_lock);
	208	}
	209
	210	static inline void ax25_route_lock_unuse(void)
	211	{
	212	read_unlock(&ax25_route_lock);
	213	}
	214
006f68b8 RB	215	static inline void ax25_put_route(ax25_route *ax25_rt)
006f68b8 RB	216	{
39f25d42	217	if (refcount_dec_and_test(&ax25_rt->refcount))
006f68b8 RB	218	__ax25_put_route(ax25_rt);
	219	}
	220
1da177e4 LT	221	typedef struct {
	222	char slave; /* slave_mode? */
	223	struct timer_list slave_timer; /* timeout timer */
	224	unsigned short slave_timeout; /* when? */
	225	} ax25_dama_info;
	226
	227	struct ctl_table;
	228
	229	typedef struct ax25_dev {
	230	struct ax25_dev *next;
	231	struct net_device *dev;
	232	struct net_device *forward;
0ca7a4c8	233	struct ctl_table_header *sysheader;
1da177e4 LT	234	int values[AX25_MAX_VALUES];
	235	#if defined(CONFIG_AX25_DAMA_SLAVE) \|\| defined(CONFIG_AX25_DAMA_MASTER)
	236	ax25_dama_info dama;
	237	#endif
	238	} ax25_dev;
	239
	240	typedef struct ax25_cb {
	241	struct hlist_node ax25_node;
	242	ax25_address source_addr, dest_addr;
	243	ax25_digi *digipeat;
	244	ax25_dev *ax25_dev;
	245	unsigned char iamdigi;
	246	unsigned char state, modulus, pidincl;
	247	unsigned short vs, vr, va;
	248	unsigned char condition, backoff;
	249	unsigned char n2, n2count;
	250	struct timer_list t1timer, t2timer, t3timer, idletimer;
	251	unsigned long t1, t2, t3, idle, rtt;
	252	unsigned short paclen, fragno, fraglen;
	253	struct sk_buff_head write_queue;
	254	struct sk_buff_head reseq_queue;
	255	struct sk_buff_head ack_queue;
	256	struct sk_buff_head frag_queue;
	257	unsigned char window;
	258	struct timer_list timer, dtimer;
	259	struct sock sk; / Backlink to socket */
b6d52ede	260	refcount_t refcount;
1da177e4 LT	261	} ax25_cb;
1da177e4 LT	262
3200392b DM	263	struct ax25_sock {
	264	struct sock sk;
	265	struct ax25_cb *cb;
	266	};
	267
	268	static inline struct ax25_sock ax25_sk(const struct sock sk)
	269	{
	270	return (struct ax25_sock *) sk;
	271	}
	272
	273	static inline struct ax25_cb sk_to_ax25(const struct sock sk)
	274	{
	275	return ax25_sk(sk)->cb;
	276	}
1da177e4	277
b67bfe0d SL	278	#define ax25_for_each(__ax25, list) \
b67bfe0d SL	279	hlist_for_each_entry(__ax25, list, ax25_node)
1da177e4 LT	280
1da177e4 LT	281	#define ax25_cb_hold(__ax25) \
b6d52ede	282	refcount_inc(&((__ax25)->refcount))
1da177e4 LT	283
	284	static __inline__ void ax25_cb_put(ax25_cb *ax25)
	285	{
b6d52ede	286	if (refcount_dec_and_test(&ax25->refcount)) {
b4558ea9	287	kfree(ax25->digipeat);
1da177e4 LT	288	kfree(ax25);
	289	}
	290	}
	291
f852640e	292	static inline __be16 ax25_type_trans(struct sk_buff skb, struct net_device dev)
56cb5156 ACM	293	{
56cb5156 ACM	294	skb->dev = dev;
459a98ed	295	skb_reset_mac_header(skb);
56cb5156	296	skb->pkt_type = PACKET_HOST;
56cb5156 ACM	297	return htons(ETH_P_AX25);
	298	}
	299
1da177e4 LT	300	/* af_ax25.c */
	301	extern struct hlist_head ax25_list;
	302	extern spinlock_t ax25_list_lock;
c1d8f804	303	void ax25_cb_add(ax25_cb *);
1da177e4 LT	304	struct sock ax25_find_listener(ax25_address , int, struct net_device *, int);
1da177e4 LT	305	struct sock ax25_get_socket(ax25_address , ax25_address *, int);
c1d8f804 JP	306	ax25_cb ax25_find_cb(ax25_address , ax25_address , ax25_digi ,
	307	struct net_device *);
	308	void ax25_send_to_raw(ax25_address , struct sk_buff , int);
	309	void ax25_destroy_socket(ax25_cb *);
	310	ax25_cb * __must_check ax25_create_cb(void);
	311	void ax25_fillin_cb(ax25_cb , ax25_dev );
	312	struct sock ax25_make_new(struct sock , struct ax25_dev *);
1da177e4 LT	313
1da177e4 LT	314	/* ax25_addr.c */
15b1c0e8 RB	315	extern const ax25_address ax25_bcast;
	316	extern const ax25_address ax25_defaddr;
	317	extern const ax25_address null_ax25_address;
c1d8f804 JP	318	char ax2asc(char buf, const ax25_address *);
	319	void asc2ax(ax25_address addr, const char callsign);
	320	int ax25cmp(const ax25_address , const ax25_address );
	321	int ax25digicmp(const ax25_digi , const ax25_digi );
	322	const unsigned char ax25_addr_parse(const unsigned char , int,
e8cc49bb	323	ax25_address , ax25_address , ax25_digi , int , int *);
c1d8f804 JP	324	int ax25_addr_build(unsigned char , const ax25_address ,
	325	const ax25_address , const ax25_digi , int, int);
	326	int ax25_addr_size(const ax25_digi *);
	327	void ax25_digi_invert(const ax25_digi , ax25_digi );
1da177e4 LT	328
	329	/* ax25_dev.c */
	330	extern ax25_dev *ax25_dev_list;
	331	extern spinlock_t ax25_dev_lock;
	332
	333	static inline ax25_dev ax25_dev_ax25dev(struct net_device dev)
	334	{
	335	return dev->ax25_ptr;
	336	}
	337
c1d8f804 JP	338	ax25_dev ax25_addr_ax25dev(ax25_address );
	339	void ax25_dev_device_up(struct net_device *);
	340	void ax25_dev_device_down(struct net_device *);
	341	int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
	342	struct net_device ax25_fwd_dev(struct net_device );
	343	void ax25_dev_free(void);
1da177e4 LT	344
1da177e4 LT	345	/* ax25_ds_in.c */
c1d8f804	346	int ax25_ds_frame_in(ax25_cb , struct sk_buff , int);
1da177e4 LT	347
1da177e4 LT	348	/* ax25_ds_subr.c */
c1d8f804 JP	349	void ax25_ds_nr_error_recovery(ax25_cb *);
	350	void ax25_ds_enquiry_response(ax25_cb *);
	351	void ax25_ds_establish_data_link(ax25_cb *);
	352	void ax25_dev_dama_off(ax25_dev *);
	353	void ax25_dama_on(ax25_cb *);
	354	void ax25_dama_off(ax25_cb *);
1da177e4 LT	355
1da177e4 LT	356	/* ax25_ds_timer.c */
c1d8f804 JP	357	void ax25_ds_setup_timer(ax25_dev *);
	358	void ax25_ds_set_timer(ax25_dev *);
	359	void ax25_ds_del_timer(ax25_dev *);
	360	void ax25_ds_timer(ax25_cb *);
	361	void ax25_ds_t1_timeout(ax25_cb *);
	362	void ax25_ds_heartbeat_expiry(ax25_cb *);
	363	void ax25_ds_t3timer_expiry(ax25_cb *);
	364	void ax25_ds_idletimer_expiry(ax25_cb *);
1da177e4 LT	365
1da177e4 LT	366	/* ax25_iface.c */
8d5cf596 RB	367
	368	struct ax25_protocol {
	369	struct ax25_protocol *next;
	370	unsigned int pid;
	371	int (func)(struct sk_buff , ax25_cb *);
	372	};
	373
c1d8f804 JP	374	void ax25_register_pid(struct ax25_protocol *ap);
c1d8f804 JP	375	void ax25_protocol_release(unsigned int);
a4282717 RB	376
	377	struct ax25_linkfail {
	378	struct hlist_node lf_node;
	379	void (func)(ax25_cb , int);
	380	};
	381
c1d8f804 JP	382	void ax25_linkfail_register(struct ax25_linkfail *lf);
	383	void ax25_linkfail_release(struct ax25_linkfail *lf);
	384	int __must_check ax25_listen_register(ax25_address , struct net_device );
	385	void ax25_listen_release(ax25_address , struct net_device );
	386	int(ax25_protocol_function(unsigned int))(struct sk_buff , ax25_cb *);
	387	int ax25_listen_mine(ax25_address , struct net_device );
	388	void ax25_link_failed(ax25_cb *, int);
	389	int ax25_protocol_is_registered(unsigned int);
1da177e4 LT	390
1da177e4 LT	391	/* ax25_in.c */
c1d8f804 JP	392	int ax25_rx_iframe(ax25_cb , struct sk_buff );
	393	int ax25_kiss_rcv(struct sk_buff , struct net_device , struct packet_type *,
	394	struct net_device *);
1da177e4 LT	395
1da177e4 LT	396	/* ax25_ip.c */
1d5da757	397	netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
3b04ddde	398	extern const struct header_ops ax25_header_ops;
1da177e4 LT	399
1da177e4 LT	400	/* ax25_out.c */
c1d8f804 JP	401	ax25_cb ax25_send_frame(struct sk_buff , int, ax25_address , ax25_address ,
	402	ax25_digi , struct net_device );
	403	void ax25_output(ax25_cb , int, struct sk_buff );
	404	void ax25_kick(ax25_cb *);
	405	void ax25_transmit_buffer(ax25_cb , struct sk_buff , int);
	406	void ax25_queue_xmit(struct sk_buff skb, struct net_device dev);
	407	int ax25_check_iframes_acked(ax25_cb *, unsigned short);
1da177e4 LT	408
1da177e4 LT	409	/* ax25_route.c */
c1d8f804 JP	410	void ax25_rt_device_down(struct net_device *);
c1d8f804 JP	411	int ax25_rt_ioctl(unsigned int, void __user *);
54047320	412	extern const struct file_operations ax25_route_fops;
c1d8f804 JP	413	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev);
	414	int ax25_rt_autobind(ax25_cb , ax25_address );
	415	struct sk_buff ax25_rt_build_path(struct sk_buff , ax25_address *,
	416	ax25_address , ax25_digi );
	417	void ax25_rt_free(void);
1da177e4	418
1da177e4	419	/* ax25_std_in.c */
c1d8f804	420	int ax25_std_frame_in(ax25_cb , struct sk_buff , int);
1da177e4 LT	421
1da177e4 LT	422	/* ax25_std_subr.c */
c1d8f804 JP	423	void ax25_std_nr_error_recovery(ax25_cb *);
	424	void ax25_std_establish_data_link(ax25_cb *);
	425	void ax25_std_transmit_enquiry(ax25_cb *);
	426	void ax25_std_enquiry_response(ax25_cb *);
	427	void ax25_std_timeout_response(ax25_cb *);
1da177e4 LT	428
1da177e4 LT	429	/* ax25_std_timer.c */
c1d8f804 JP	430	void ax25_std_heartbeat_expiry(ax25_cb *);
	431	void ax25_std_t1timer_expiry(ax25_cb *);
	432	void ax25_std_t2timer_expiry(ax25_cb *);
	433	void ax25_std_t3timer_expiry(ax25_cb *);
	434	void ax25_std_idletimer_expiry(ax25_cb *);
1da177e4 LT	435
1da177e4 LT	436	/* ax25_subr.c */
c1d8f804 JP	437	void ax25_clear_queues(ax25_cb *);
	438	void ax25_frames_acked(ax25_cb *, unsigned short);
	439	void ax25_requeue_frames(ax25_cb *);
	440	int ax25_validate_nr(ax25_cb *, unsigned short);
	441	int ax25_decode(ax25_cb , struct sk_buff , int , int , int *);
	442	void ax25_send_control(ax25_cb *, int, int, int);
	443	void ax25_return_dm(struct net_device , ax25_address , ax25_address *,
	444	ax25_digi *);
	445	void ax25_calculate_t1(ax25_cb *);
	446	void ax25_calculate_rtt(ax25_cb *);
	447	void ax25_disconnect(ax25_cb *, int);
1da177e4 LT	448
1da177e4 LT	449	/* ax25_timer.c */
c1d8f804 JP	450	void ax25_setup_timers(ax25_cb *);
	451	void ax25_start_heartbeat(ax25_cb *);
	452	void ax25_start_t1timer(ax25_cb *);
	453	void ax25_start_t2timer(ax25_cb *);
	454	void ax25_start_t3timer(ax25_cb *);
	455	void ax25_start_idletimer(ax25_cb *);
	456	void ax25_stop_heartbeat(ax25_cb *);
	457	void ax25_stop_t1timer(ax25_cb *);
	458	void ax25_stop_t2timer(ax25_cb *);
	459	void ax25_stop_t3timer(ax25_cb *);
	460	void ax25_stop_idletimer(ax25_cb *);
	461	int ax25_t1timer_running(ax25_cb *);
	462	unsigned long ax25_display_timer(struct timer_list *);
1da177e4 LT	463
	464	/* ax25_uid.c */
	465	extern int ax25_uid_policy;
c1d8f804 JP	466	ax25_uid_assoc *ax25_findbyuid(kuid_t);
c1d8f804 JP	467	int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
54047320	468	extern const struct file_operations ax25_uid_fops;
c1d8f804	469	void ax25_uid_free(void);
1da177e4 LT	470
	471	/* sysctl_net_ax25.c */
	472	#ifdef CONFIG_SYSCTL
c1d8f804 JP	473	int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
c1d8f804 JP	474	void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
1da177e4	475	#else
b9898507 EB	476	static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
b9898507 EB	477	static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
1da177e4 LT	478	#endif /* CONFIG_SYSCTL */
	479
	480	#endif