discovery.h

linux-2.4.29操作系统的源码

/*********************************************************************
 *                
 * Filename:      discovery.h
 * Version:       
 * Description:   
 * Status:        Experimental.
 * Author:        Dag Brattli <[e-mail]>
 * Created at:    Tue Apr  6 16:53:53 1999
 * Modified at:   Tue Oct  5 10:05:10 1999
 * Modified by:   Dag Brattli <[e-mail]>
 * 
 *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
 *     
 *     This program is free software; you can redistribute it and/or 
 *     modify it under the terms of the GNU General Public License as 
 *     published by the Free Software Foundation; either version 2 of 
 *     the License, or (at your option) any later version.
 * 
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License 
 *     along with this program; if not, write to the Free Software 
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *     MA 02111-1307 USA
 *     
 ********************************************************************/

#ifndef DISCOVERY_H
#define DISCOVERY_H

#include <asm/param.h>

#include <net/irda/irda.h>
#include <net/irda/irqueue.h>

#define DISCOVERY_EXPIRE_TIMEOUT (2*sysctl_discovery_timeout*HZ)
#define DISCOVERY_DEFAULT_SLOTS  0

/* Types of discovery */
typedef enum {
	DISCOVERY_LOG,		/* What's in our discovery log */
	DISCOVERY_ACTIVE,	/* Doing our own discovery on the medium */
	DISCOVERY_PASSIVE,	/* Peer doing discovery on the medium */
	EXPIRY_TIMEOUT,		/* Entry expired due to timeout */
} DISCOVERY_MODE;

#define NICKNAME_MAX_LEN 21

/*
 * The DISCOVERY structure is used for both discovery requests and responses
 */
typedef struct discovery_t {
	irda_queue_t q;          /* Must be first! */

	__u32      saddr;        /* Which link the device was discovered */
	__u32      daddr;        /* Remote device address */
	LAP_REASON condition;    /* More info about the discovery */

	__u16_host_order hints;  /* Discovery hint bits */
	__u8       charset;      /* Encoding of nickname */
	char       nickname[22]; /* The name of the device (21 bytes + \0) */
	int        name_len;     /* Lenght of nickname */

	int        gen_addr_bit; /* Need to generate a new device address? */
	int        nslots;       /* Number of slots to use when discovering */
	unsigned long timestamp; /* Time discovered */
	unsigned long first_timestamp; /* First time discovered */
} discovery_t;

void irlmp_add_discovery(hashbin_t *cachelog, discovery_t *discovery);
void irlmp_add_discovery_log(hashbin_t *cachelog, hashbin_t *log);
void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force);
struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn, __u16 mask);

#endif