Current File : //usr/src/kernels/3.10.0-1160.83.1.el7.centos.plus.x86_64/include/net/irda/discovery.h
/*********************************************************************
*
* Filename: discovery.h
* Version:
* Description:
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Tue Apr 6 16:53:53 1999
* Modified at: Tue Oct 5 10:05:10 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#ifndef DISCOVERY_H
#define DISCOVERY_H
#include <asm/param.h>
#include <net/irda/irda.h>
#include <net/irda/irqueue.h> /* irda_queue_t */
#include <net/irda/irlap_event.h> /* LAP_REASON */
#define DISCOVERY_EXPIRE_TIMEOUT (2*sysctl_discovery_timeout*HZ)
#define DISCOVERY_DEFAULT_SLOTS 0
/*
* This type is used by the protocols that transmit 16 bits words in
* little endian format. A little endian machine stores MSB of word in
* byte[1] and LSB in byte[0]. A big endian machine stores MSB in byte[0]
* and LSB in byte[1].
*
* This structure is used in the code for things that are endian neutral
* but that fit in a word so that we can manipulate them efficiently.
* By endian neutral, I mean things that are really an array of bytes,
* and always used as such, for example the hint bits. Jean II
*/
typedef union {
__u16 word;
__u8 byte[2];
} __u16_host_order;
/* 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
/* Basic discovery information about a peer */
typedef struct irda_device_info discinfo_t; /* linux/irda.h */
/*
* The DISCOVERY structure is used for both discovery requests and responses
*/
typedef struct discovery_t {
irda_queue_t q; /* Must be first! */
discinfo_t data; /* Basic discovery information */
int name_len; /* Length of nickname */
LAP_REASON condition; /* More info about the discovery */
int gen_addr_bit; /* Need to generate a new device
* address? */
int nslots; /* Number of slots to use when
* discovering */
unsigned long timestamp; /* Last time discovered */
unsigned long firststamp; /* 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, int old_entries);
#endif
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