cregit-Linux how code gets into the kernel

Release 4.12 include/net/lapb.h

Directory: include/net
#ifndef _LAPB_H

#define _LAPB_H 
#include <linux/lapb.h>


#define	LAPB_HEADER_LEN	20		
/* LAPB over Ethernet + a bit more */


#define	LAPB_ACK_PENDING_CONDITION	0x01

#define	LAPB_REJECT_CONDITION		0x02

#define	LAPB_PEER_RX_BUSY_CONDITION	0x04

/* Control field templates */

#define	LAPB_I		0x00	
/* Information frames */

#define	LAPB_S		0x01	
/* Supervisory frames */

#define	LAPB_U		0x03	
/* Unnumbered frames */


#define	LAPB_RR		0x01	
/* Receiver ready */

#define	LAPB_RNR	0x05	
/* Receiver not ready */

#define	LAPB_REJ	0x09	
/* Reject */


#define	LAPB_SABM	0x2F	
/* Set Asynchronous Balanced Mode */

#define	LAPB_SABME	0x6F	
/* Set Asynchronous Balanced Mode Extended */

#define	LAPB_DISC	0x43	
/* Disconnect */

#define	LAPB_DM		0x0F	
/* Disconnected mode */

#define	LAPB_UA		0x63	
/* Unnumbered acknowledge */

#define	LAPB_FRMR	0x87	
/* Frame reject */


#define LAPB_ILLEGAL	0x100	
/* Impossible to be a real frame type */


#define	LAPB_SPF	0x10	
/* Poll/final bit for standard LAPB */

#define	LAPB_EPF	0x01	
/* Poll/final bit for extended LAPB */


#define	LAPB_FRMR_W	0x01	
/* Control field invalid        */

#define	LAPB_FRMR_X	0x02	
/* I field invalid              */

#define	LAPB_FRMR_Y	0x04	
/* I field too long             */

#define	LAPB_FRMR_Z	0x08	
/* Invalid N(R)                 */


#define	LAPB_POLLOFF	0

#define	LAPB_POLLON	1

/* LAPB C-bit */

#define LAPB_COMMAND	1

#define LAPB_RESPONSE	2


#define	LAPB_ADDR_A	0x03

#define	LAPB_ADDR_B	0x01

#define	LAPB_ADDR_C	0x0F

#define	LAPB_ADDR_D	0x07

/* Define Link State constants. */
enum {
	
LAPB_STATE_0,	/* Disconnected State           */
	
LAPB_STATE_1,	/* Awaiting Connection State    */
	
LAPB_STATE_2,	/* Awaiting Disconnection State */
	
LAPB_STATE_3,	/* Data Transfer State          */
	
LAPB_STATE_4	/* Frame Reject State           */
};


#define	LAPB_DEFAULT_MODE		(LAPB_STANDARD | LAPB_SLP | LAPB_DTE)

#define	LAPB_DEFAULT_WINDOW		7		
/* Window=7 */

#define	LAPB_DEFAULT_T1			(5 * HZ)	
/* T1=5s    */

#define	LAPB_DEFAULT_T2			(1 * HZ)	
/* T2=1s    */

#define	LAPB_DEFAULT_N2			20		
/* N2=20    */


#define	LAPB_SMODULUS	8

#define	LAPB_EMODULUS	128

/*
 *      Information about the current frame.
 */

struct lapb_frame {
	
unsigned short		type;		/* Parsed type          */
	

unsigned short		nr, ns;		/* N(R), N(S)           */
	
unsigned char		cr;		/* Command/Response     */
	
unsigned char		pf;		/* Poll/Final           */
	
unsigned char		control[2];	/* Original control data*/
};

/*
 *      The per LAPB connection control structure.
 */

struct lapb_cb {
	
struct list_head	node;
	
struct net_device	*dev;

	/* Link status fields */
	
unsigned int		mode;
	
unsigned char		state;
	


unsigned short		vs, vr, va;
	
unsigned char		condition;
	

unsigned short		n2, n2count;
	

unsigned short		t1, t2;
	

struct timer_list	t1timer, t2timer;

	/* Internal control information */
	
struct sk_buff_head	write_queue;
	
struct sk_buff_head	ack_queue;
	
unsigned char		window;
	
const struct lapb_register_struct *callbacks;

	/* FRMR control information */
	
struct lapb_frame	frmr_data;
	
unsigned char		frmr_type;

	
atomic_t		refcnt;
};

/* lapb_iface.c */
void lapb_connect_confirmation(struct lapb_cb *lapb, int);
void lapb_connect_indication(struct lapb_cb *lapb, int);
void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
void lapb_disconnect_indication(struct lapb_cb *lapb, int);
int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);

/* lapb_in.c */
void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);

/* lapb_out.c */
void lapb_kick(struct lapb_cb *lapb);
void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
void lapb_establish_data_link(struct lapb_cb *lapb);
void lapb_enquiry_response(struct lapb_cb *lapb);
void lapb_timeout_response(struct lapb_cb *lapb);
void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
void lapb_check_need_response(struct lapb_cb *lapb, int, int);

/* lapb_subr.c */
void lapb_clear_queues(struct lapb_cb *lapb);
void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
void lapb_requeue_frames(struct lapb_cb *lapb);
int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
void lapb_send_control(struct lapb_cb *lapb, int, int, int);
void lapb_transmit_frmr(struct lapb_cb *lapb);

/* lapb_timer.c */
void lapb_start_t1timer(struct lapb_cb *lapb);
void lapb_start_t2timer(struct lapb_cb *lapb);
void lapb_stop_t1timer(struct lapb_cb *lapb);
void lapb_stop_t2timer(struct lapb_cb *lapb);
int lapb_t1timer_running(struct lapb_cb *lapb);

/*
 * Debug levels.
 *      0 = Off
 *      1 = State Changes
 *      2 = Packets I/O and State Changes
 *      3 = Hex dumps, Packets I/O and State Changes.
 */

#define	LAPB_DEBUG	0


#define lapb_dbg(level, fmt, ...)			\
do {                                                    \
        if (level < LAPB_DEBUG)                         \
                pr_debug(fmt, ##__VA_ARGS__);           \
} while (0)

#endif

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)56087.77%550.00%
Arnaldo Carvalho de Melo589.09%110.00%
Joe Perches121.88%110.00%
Al Viro50.78%110.00%
Stephen Hemminger20.31%110.00%
David S. Miller10.16%110.00%
Total638100.00%10100.00%
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