linux/include/net/irda/discovery.h
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   1/*********************************************************************
   2 *                
   3 * Filename:      discovery.h
   4 * Version:       
   5 * Description:   
   6 * Status:        Experimental.
   7 * Author:        Dag Brattli <dagb@cs.uit.no>
   8 * Created at:    Tue Apr  6 16:53:53 1999
   9 * Modified at:   Tue Oct  5 10:05:10 1999
  10 * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11 * 
  12 *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
  13 *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
  14 *     
  15 *     This program is free software; you can redistribute it and/or 
  16 *     modify it under the terms of the GNU General Public License as 
  17 *     published by the Free Software Foundation; either version 2 of 
  18 *     the License, or (at your option) any later version.
  19 * 
  20 *     This program is distributed in the hope that it will be useful,
  21 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23 *     GNU General Public License for more details.
  24 * 
  25 *     You should have received a copy of the GNU General Public License 
  26 *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  27 *     
  28 ********************************************************************/
  29
  30#ifndef DISCOVERY_H
  31#define DISCOVERY_H
  32
  33#include <asm/param.h>
  34
  35#include <net/irda/irda.h>
  36#include <net/irda/irqueue.h>           /* irda_queue_t */
  37#include <net/irda/irlap_event.h>       /* LAP_REASON */
  38
  39#define DISCOVERY_EXPIRE_TIMEOUT (2*sysctl_discovery_timeout*HZ)
  40#define DISCOVERY_DEFAULT_SLOTS  0
  41
  42/*
  43 *  This type is used by the protocols that transmit 16 bits words in 
  44 *  little endian format. A little endian machine stores MSB of word in
  45 *  byte[1] and LSB in byte[0]. A big endian machine stores MSB in byte[0] 
  46 *  and LSB in byte[1].
  47 *
  48 * This structure is used in the code for things that are endian neutral
  49 * but that fit in a word so that we can manipulate them efficiently.
  50 * By endian neutral, I mean things that are really an array of bytes,
  51 * and always used as such, for example the hint bits. Jean II
  52 */
  53typedef union {
  54        __u16 word;
  55        __u8  byte[2];
  56} __u16_host_order;
  57
  58/* Types of discovery */
  59typedef enum {
  60        DISCOVERY_LOG,          /* What's in our discovery log */
  61        DISCOVERY_ACTIVE,       /* Doing our own discovery on the medium */
  62        DISCOVERY_PASSIVE,      /* Peer doing discovery on the medium */
  63        EXPIRY_TIMEOUT,         /* Entry expired due to timeout */
  64} DISCOVERY_MODE;
  65
  66#define NICKNAME_MAX_LEN 21
  67
  68/* Basic discovery information about a peer */
  69typedef struct irda_device_info         discinfo_t;     /* linux/irda.h */
  70
  71/*
  72 * The DISCOVERY structure is used for both discovery requests and responses
  73 */
  74typedef struct discovery_t {
  75        irda_queue_t    q;              /* Must be first! */
  76
  77        discinfo_t      data;           /* Basic discovery information */
  78        int             name_len;       /* Length of nickname */
  79
  80        LAP_REASON      condition;      /* More info about the discovery */
  81        int             gen_addr_bit;   /* Need to generate a new device
  82                                         * address? */
  83        int             nslots;         /* Number of slots to use when
  84                                         * discovering */
  85        unsigned long   timestamp;      /* Last time discovered */
  86        unsigned long   firststamp;     /* First time discovered */
  87} discovery_t;
  88
  89void irlmp_add_discovery(hashbin_t *cachelog, discovery_t *discovery);
  90void irlmp_add_discovery_log(hashbin_t *cachelog, hashbin_t *log);
  91void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force);
  92struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
  93                                                __u16 mask, int old_entries);
  94
  95#endif
  96