Linux 2.2.3pre3

[davej-history.git] / net / irda / irlmp.c

/*********************************************************************
 *                
 * Filename:      irlmp.c
 * Version:       0.8
 * Description:   IrDA Link Management Protocol (LMP) layer                 
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 17 20:54:32 1997
 * Modified at:   Sat Feb 20 01:28:39 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * 
 *     Copyright (c) 1998 Dag Brattli <dagb@cs.uit.no>, 
 *     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.
 *
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is 
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#include <linux/config.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/timer.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h>
#include <net/irda/iriap.h>
#include <net/irda/irlmp.h>
#include <net/irda/irlmp_frame.h>
#include <linux/kmod.h>

/* Master structure */
struct irlmp_cb *irlmp = NULL;

/* These can be altered by the sysctl interface */
int sysctl_discovery = 0;
int sysctl_discovery_slots = 6;
char sysctl_devname[65];

char *lmp_reasons[] = {
        "ERROR, NOT USED",
        "LM_USER_REQUEST",
        "LM_LAP_DISCONNECT",
        "LM_CONNECT_FAILURE",
        "LM_LAP_RESET",
        "LM_INIT_DISCONNECT",
        "ERROR, NOT USED",
};

__u8 *irlmp_hint_to_service( __u8 *hint);
#ifdef CONFIG_PROC_FS
int irlmp_proc_read( char *buf, char **start, off_t offset, int len, 
                     int unused);
#endif

/*
 * Function irlmp_init (void)
 *
 *    Create (allocate) the main IrLMP structure and the pointer array
 *    which will contain pointers to each instance of a LSAP.
 */
__initfunc(int irlmp_init(void))
{
        /* Initialize the irlmp structure. */
        if ( irlmp == NULL) {
                irlmp = kmalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
                if ( irlmp == NULL)
                        return -ENOMEM;
        }
        memset( irlmp, 0, sizeof(struct irlmp_cb));
        
        irlmp->magic = LMP_MAGIC;

        irlmp->registry = hashbin_new( HB_LOCAL);
        irlmp->links = hashbin_new( HB_LOCAL);
        irlmp->unconnected_lsaps = hashbin_new( HB_GLOBAL);
        
        irlmp->free_lsap_sel = 0x10; /* Servers use 0x00-0x0f */
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
        irlmp->cache.valid = FALSE;
#endif
        strcpy( sysctl_devname, "Linux");
        
        /* Do discovery every 3 seconds */
        init_timer( &irlmp->discovery_timer);
        irlmp_start_discovery_timer( irlmp, 600); 

        return 0;
}

/*
 * Function irlmp_cleanup (void)
 *
 *    Remove IrLMP layer
 *
 */
void irlmp_cleanup(void) 
{
        /* Check for main structure */
        ASSERT( irlmp != NULL, return;);
        ASSERT( irlmp->magic == LMP_MAGIC, return;);

        del_timer( &irlmp->discovery_timer);
        
        /* FIXME, we need a special function to deallocate LAPs */
        hashbin_delete( irlmp->links, (FREE_FUNC) kfree);
        hashbin_delete( irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
        hashbin_delete( irlmp->registry, (FREE_FUNC) kfree);
        
        /* De-allocate main structure */
        kfree( irlmp);
        irlmp = NULL;
}

/*
 * Function irlmp_open_lsap (slsap, notify)
 *
 *   Register with IrLMP and create a local LSAP,
 *   returns handle to LSAP.
 */
struct lsap_cb *irlmp_open_lsap( __u8 slsap_sel, struct notify_t *notify)
{
        struct lsap_cb *self;

        ASSERT( notify != NULL, return NULL;);
        ASSERT( irlmp != NULL, return NULL;);
        ASSERT( irlmp->magic == LMP_MAGIC, return NULL;);

        DEBUG( 4, __FUNCTION__ "(), slsap_sel=%02x\n", slsap_sel);

        /* 
         *  Does the client care which Source LSAP selector it gets? 
         */
        if ( slsap_sel == LSAP_ANY) {
                /*
                 *  Find unused LSAP
                 */
                slsap_sel = irlmp_find_free_slsap();
                if ( slsap_sel == 0)
                        return NULL;
        } else {
                /*
                 *  Client wants specific LSAP, so check if it's already
                 *  in use
                 */
                if ( irlmp_slsap_inuse( slsap_sel)) {
                        return NULL;
                }
                if ( slsap_sel > irlmp->free_lsap_sel)
                        irlmp->free_lsap_sel = slsap_sel+1;
        }

        /*
         *  Allocate new instance of a LSAP connection
         */
        self = kmalloc( sizeof(struct lsap_cb), GFP_ATOMIC);
        if ( self == NULL) {
                printk( KERN_ERR "IrLMP: Can't allocate memory for "
                        "LSAP control block!\n");
                return NULL;
        }
        memset( self, 0, sizeof(struct lsap_cb));
        
        self->magic = LMP_LSAP_MAGIC;
        self->slsap_sel = slsap_sel;
        self->dlsap_sel = LSAP_ANY;
        self->connected = FALSE;

        init_timer( &self->watchdog_timer);

        ASSERT( notify->instance != NULL, return NULL;);
        self->notify = *notify;

        irlmp_next_lsap_state( self, LSAP_DISCONNECTED);
        
        /*
         *  Insert into queue of unconnected LSAPs
         */
        hashbin_insert( irlmp->unconnected_lsaps, (QUEUE *) self, 
                        self->slsap_sel, NULL);
        
        return self;
}

/*
 * Function irlmp_close_lsap (self)
 *
 *    Remove an instance of a LSAP
 */
static void __irlmp_close_lsap( struct lsap_cb *self)
{
        DEBUG( 4, __FUNCTION__ "()\n");

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);

        /*
         *  Set some of the variables to preset values
         */
        self->magic = ~LMP_LSAP_MAGIC;
        del_timer( &self->watchdog_timer); /* Important! */

#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
        ASSERT( irlmp != NULL, return;);
        irlmp->cache.valid = FALSE;
#endif
        kfree( self);
}

/*
 * Function irlmp_close_lsap (self)
 *
 *    
 *
 */
void irlmp_close_lsap( struct lsap_cb *self)
{
        struct lap_cb *lap;
        struct lsap_cb *lsap;

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);

        lap = self->lap;

        /*
         *  Find out if we should remove this LSAP from a link or from the
         *  list of unconnected lsaps (not associated with a link)
         */
        if ( lap == NULL) {
                lsap = hashbin_remove( irlmp->unconnected_lsaps, 
                                       self->slsap_sel, NULL);
        } else {
                ASSERT( lap != NULL, return;);
                ASSERT( lap->magic == LMP_LAP_MAGIC, return;);
                
                lsap = hashbin_remove( lap->lsaps, self->slsap_sel, NULL);
        }
        if ( lsap == NULL) {
                DEBUG( 1, __FUNCTION__ 
                       "(), Looks like somebody has removed me already!\n");
                return;
        }
        ASSERT( lsap == self, return;);

        __irlmp_close_lsap( self);
}

/*
 * Function irlmp_register_irlap (saddr, notify)
 *
 *    Register IrLAP layer with IrLMP. There is possible to have multiple
 *    instances of the IrLAP layer, each connected to different IrDA ports
 *
 */
void irlmp_register_irlap( struct irlap_cb *irlap, __u32 saddr, 
                           struct notify_t *notify)
{
        struct lap_cb *lap;

        DEBUG( 4, __FUNCTION__ "(), Registered IrLAP, saddr = %08x\n",
               saddr);
        
        ASSERT( irlmp != NULL, return;);
        ASSERT( irlmp->magic == LMP_MAGIC, return;);
        ASSERT( notify != NULL, return;);

        /*
         *  Allocate new instance of a LSAP connection
         */
        lap = kmalloc( sizeof(struct lap_cb), GFP_KERNEL);
        if ( lap == NULL) {
                printk( KERN_ERR "IrLMP: Can't allocate memory for "
                        "LAP control block!\n");
                return;
        }
        memset( lap, 0, sizeof(struct lap_cb));
        
        lap->irlap = irlap;
        lap->magic = LMP_LAP_MAGIC;
        lap->saddr = saddr;
        lap->daddr = DEV_ADDR_ANY;
        lap->lsaps = hashbin_new( HB_GLOBAL);
        lap->cachelog = hashbin_new( HB_LOCAL);

        irlmp_next_lap_state( lap, LAP_STANDBY);
        
        init_timer(&lap->idle_timer);

        /*
         *  Insert into queue of unconnected LSAPs
         */
        hashbin_insert( irlmp->links, (QUEUE *) lap, lap->saddr, NULL);

        /* 
         *  We set only this variable so IrLAP can tell us on which link the
         *  different events happened on 
         */
        irda_notify_init( notify);
        notify->instance = lap;
}

/*
 * Function irlmp_unregister_irlap (saddr)
 *
 *    IrLAP layer has been removed!
 *
 */
void irlmp_unregister_irlap(__u32 saddr)
{
        struct lap_cb *self;

        DEBUG(4, __FUNCTION__ "()\n");

        self = hashbin_remove(irlmp->links, saddr, NULL);
        if (self) {
                ASSERT(self->magic == LMP_LAP_MAGIC, return;);

                del_timer(&self->idle_timer);   

                self->magic = 0;
                kfree(self);
        } else {
                DEBUG(1, __FUNCTION__ "(), Didn't find LAP layer!\n");
        }
}

void dump_discoveries( hashbin_t *log)
{
        DISCOVERY *d;

        ASSERT( log != NULL, return;);

        d = (DISCOVERY *) hashbin_get_first( log);
        while( d != NULL) {
                DEBUG( 1, "Discovery:\n");
                DEBUG( 1, "  daddr=%08x\n", d->daddr);
                DEBUG( 1, "  name=%s\n", d->info);

                d = (DISCOVERY *) hashbin_get_next( log);
        }
}

static struct lap_cb *irlmp_find_link( __u32 daddr)
{
        struct lap_cb *lap;
        unsigned long flags;

        DEBUG( 1, __FUNCTION__ 
               "(), client didn't supply saddr, so try to look it up!\n");

        /* 
         *  Find out which link to connect on, and make sure nothing strange
         *  happens while we traverse the list
         */
        save_flags( flags);
        cli();

        lap = (struct lap_cb *) hashbin_get_first( irlmp->links);
        while ( lap != NULL) {
                ASSERT( lap->magic == LMP_LAP_MAGIC, return NULL;);
                /* dump_discoveries( lap->cachelog); */

                if ( hashbin_find( lap->cachelog, daddr, NULL)) {
                        DEBUG( 4, __FUNCTION__
                               "() found link to connect on!\n");
                        return lap;
                }
                lap = (struct lap_cb *) hashbin_get_next( irlmp->links);
        }
        restore_flags(flags);

        return NULL;
}

/*
 * Function irlmp_connect_request (handle, dlsap, userdata)
 *
 *    Connect with a peer LSAP  
 *
 */
int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel, 
                          __u32 saddr, __u32 daddr, 
                          struct qos_info *qos, struct sk_buff *userdata) 
{
        struct sk_buff *skb = NULL;
        struct lap_cb *lap;
        struct lsap_cb *lsap;

        ASSERT( self != NULL, return -1;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return -1;);
        
        DEBUG( 4, __FUNCTION__ 
               "(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n", 
               self->slsap_sel, dlsap_sel, saddr, daddr);
        
        if ( self->connected) {
                DEBUG( 1, __FUNCTION__ "(), Error: already connected!!\n");
                
                return -EISCONN;
        }

        /* Any userdata? */
        if ( userdata == NULL) {
                skb = dev_alloc_skb( 64);
                if (skb == NULL) {
                        DEBUG( 1, __FUNCTION__ 
                               "(), Could not allocate sk_buff of length %d\n",
                               64);
                        return -1;
                }
                skb_reserve( skb, LMP_CONTROL_HEADER+LAP_HEADER);
        } else
                skb = userdata;
        
        /* Make room for MUX control header ( 3 bytes) */
        ASSERT( skb_headroom( skb) >= LMP_CONTROL_HEADER, return -1;);
        skb_push( skb, LMP_CONTROL_HEADER);

        self->dlsap_sel = dlsap_sel;
        self->tmp_skb = skb;
        
        /*  
         * Find the link to where we should try to connect since there may
         * be more than one IrDA port on this machine. If the client has
         * passed us the saddr (and already knows which link to use), then
         * we use that to find the link, if not then we have to look in the
         * discovery log and check if any of the links has discovered a
         * device with the given daddr 
         */
        if ( saddr)
                lap = hashbin_find( irlmp->links, saddr, NULL);
        else
                lap = irlmp_find_link( daddr);
        
        if ( lap == NULL) {
                DEBUG( 1, __FUNCTION__ "(), Unable to find a usable link!\n");
                
                return -EHOSTUNREACH;
        }
        self->lap = lap;

        /* 
         *  Remove LSAP from list of unconnected LSAPs and insert it into the 
         *  list of connected LSAPs for the particular link */
        lsap = hashbin_remove( irlmp->unconnected_lsaps, self->slsap_sel, 
                               NULL);

        ASSERT( lsap != NULL, return -1;);
        ASSERT( lsap->magic == LMP_LSAP_MAGIC, return -1;);
        ASSERT( lsap->lap != NULL, return -1;);
        ASSERT( lsap->lap->magic == LMP_LAP_MAGIC, return -1;);

        hashbin_insert( self->lap->lsaps, (QUEUE *) self, self->slsap_sel, 
                        NULL);

        self->connected = TRUE;

        /*
         *  User supplied qos specifications?
         */
        if (qos)
                self->qos = *qos;
        
        DEBUG( 4, "*** Connecting SLSAP=%02x, DLSAP= %02x\n",
               self->slsap_sel, self->dlsap_sel);
        
        irlmp_do_lsap_event( self, LM_CONNECT_REQUEST, skb);

        return 0;
}

/*
 * Function irlmp_connect_indication (self)
 *
 *    Incomming connection
 *
 */
void irlmp_connect_indication( struct lsap_cb *self, struct sk_buff *skb) 
{
        int max_seg_size;

        DEBUG( 4, __FUNCTION__ "()\n");
        
        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( skb != NULL, return;);
        ASSERT( self->lap != NULL, return;);

        self->qos = *self->lap->qos;

        max_seg_size = self->lap->qos->data_size.value;
        DEBUG( 4, __FUNCTION__ "(), max_seg_size=%d\n", max_seg_size);
        
        /* Hide LMP_CONTROL_HEADER header from layer above */
        skb_pull( skb, LMP_CONTROL_HEADER);

        if ( self->notify.connect_indication)
                self->notify.connect_indication(self->notify.instance, self, 
                                                &self->qos, max_seg_size, skb);
}

/*
 * Function irlmp_connect_response (handle, userdata)
 *
 *    Service user is accepting connection
 *
 */
void irlmp_connect_response( struct lsap_cb *self, struct sk_buff *userdata) 
{
        DEBUG( 4, __FUNCTION__ "()\n");
        
        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( userdata != NULL, return;);

        self->connected = TRUE;

        DEBUG( 4, "irlmp_connect_response: slsap_sel=%02x, dlsap_sel=%02x\n", 
               self->slsap_sel, self->dlsap_sel);

        /* Make room for MUX control header ( 3 bytes) */
        ASSERT( skb_headroom( userdata) >= LMP_CONTROL_HEADER, return;);
        skb_push( userdata, LMP_CONTROL_HEADER);
        
        irlmp_do_lsap_event( self, LM_CONNECT_RESPONSE, userdata);
}

/*
 * Function irlmp_connect_confirm (handle, skb)
 *
 *    LSAP connection confirmed peer device!
 */
void irlmp_connect_confirm( struct lsap_cb *self, struct sk_buff *skb) 
{
        int max_seg_size;

        DEBUG( 4, __FUNCTION__ "()\n");
        
        ASSERT( skb != NULL, return;);
        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        
        ASSERT( self->lap != NULL, return;);
        self->qos = *self->lap->qos;

        max_seg_size = self->qos.data_size.value;
        DEBUG( 4, __FUNCTION__ "(), max_seg_size=%d\n", max_seg_size);
        
        /* Hide LMP_CONTROL_HEADER header from layer above */
        skb_pull( skb, LMP_CONTROL_HEADER);

        if ( self->notify.connect_confirm) {
                self->notify.connect_confirm( self->notify.instance, self,
                                              &self->qos, max_seg_size, skb);
        }
}

/*
 * Function irlmp_disconnect_request (handle, userdata)
 *
 *    The service user is requesting disconnection, this will not remove the 
 *    LSAP, but only mark it as disconnected
 */
void irlmp_disconnect_request( struct lsap_cb *self, struct sk_buff *userdata) 
{
        struct lsap_cb *lsap;

        DEBUG( 4, __FUNCTION__ "()\n");

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);

        /* Already disconnected? */
        if ( !self->connected) {
                DEBUG( 1, __FUNCTION__ "(), already disconnected!\n");
                return;
        }

        ASSERT( userdata != NULL, return;);
        ASSERT( self->connected == TRUE, return;);
        
        skb_push( userdata, LMP_CONTROL_HEADER);

        /* 
         *  Do the event before the other stuff since we must know
         *  which lap layer that the frame should be transmitted on
         */
        irlmp_do_lsap_event( self, LM_DISCONNECT_REQUEST, userdata);

        /* 
         *  Remove LSAP from list of connected LSAPs for the particular link
         *  and insert it into the list of unconnected LSAPs
         */
        ASSERT( self->lap != NULL, return;);
        ASSERT( self->lap->magic == LMP_LAP_MAGIC, return;);
        ASSERT( self->lap->lsaps != NULL, return;);

        lsap = hashbin_remove( self->lap->lsaps, self->slsap_sel, NULL);

        ASSERT( lsap != NULL, return;);
        ASSERT( lsap->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( lsap == self, return;);

        hashbin_insert( irlmp->unconnected_lsaps, (QUEUE *) self, 
                        self->slsap_sel, NULL);
        
        /* Reset some values */
        self->connected = FALSE;
        self->dlsap_sel = LSAP_ANY;
        self->lap = NULL;
}

/*
 * Function irlmp_disconnect_indication (reason, userdata)
 *
 *    LSAP is being closed!
 */
void irlmp_disconnect_indication( struct lsap_cb *self, LM_REASON reason, 
                                  struct sk_buff *userdata) 
{
        struct lsap_cb *lsap;

        DEBUG( 1, __FUNCTION__ "(), reason=%s\n", lmp_reasons[reason]); 

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( self->connected == TRUE, return;); 

        DEBUG( 3, __FUNCTION__ "(), slsap_sel=%02x, dlsap_sel=%02x\n", 
               self->slsap_sel, self->dlsap_sel);

        self->connected = FALSE;
        self->dlsap_sel = LSAP_ANY;

        /* 
         *  Remove association between this LSAP and the link it used 
         */
        ASSERT( self->lap != NULL, return;);
        ASSERT( self->lap->lsaps != NULL, return;);

        lsap = hashbin_remove( self->lap->lsaps, self->slsap_sel, NULL);

        ASSERT( lsap != NULL, return;);
        ASSERT( lsap == self, return;);
        hashbin_insert( irlmp->unconnected_lsaps, (QUEUE *) lsap, 
                        lsap->slsap_sel, NULL);

        self->lap = NULL;
        
        /*
         *  Inform service user
         */
        if ( self->notify.disconnect_indication) {
                self->notify.disconnect_indication( self->notify.instance, 
                                                    self, reason, userdata);
        }
}

/*
 * Function irlmp_discovery_request (nslots)
 *
 *    Do a discovery of devices in front of the computer
 *
 */
void irlmp_discovery_request( int nslots)
{
        struct lap_cb *lap;

        DEBUG( 4, __FUNCTION__ "(), nslots=%d\n", nslots);

        ASSERT( irlmp != NULL, return;);

        if ( !sysctl_discovery)
                return;

        if ((nslots != 1)&&(nslots != 6)&&(nslots != 8)&&(nslots != 16)) {
                DEBUG( 1, __FUNCTION__ "(), invalid number of slots value!\n");
                nslots = sysctl_discovery_slots = 8;
        }

        /*
         *  Construct new discovery info to be used by IrLAP,
         *  TODO: no need to do this every time!
         */
        irlmp->discovery_cmd.hint[0] = irlmp->hint[0];
        irlmp->discovery_cmd.hint[1] = irlmp->hint[1];
        
        /* 
         *  Set character set for device name (we use ASCII), and 
         *  copy device name. Remember to make room for a \0 at the 
         *  end
         */
        irlmp->discovery_cmd.charset = CS_ASCII;
        
        strncpy( irlmp->discovery_cmd.info, sysctl_devname, 31);
        irlmp->discovery_cmd.info_len = strlen( irlmp->discovery_cmd.info);
        irlmp->discovery_cmd.nslots = nslots;
        
        /*
         * Try to send discovery packets on all links
         */
        lap = ( struct lap_cb *) hashbin_get_first( irlmp->links);
        while ( lap != NULL) {
                ASSERT( lap->magic == LMP_LAP_MAGIC, return;);

                DEBUG( 4, __FUNCTION__ "() sending request!\n");
                irlmp_do_lap_event( lap, LM_LAP_DISCOVERY_REQUEST, NULL);
                
                lap = ( struct lap_cb *) hashbin_get_next( irlmp->links);
        }
}

/*
 * Function irlmp_check_services (discovery)
 *
 *    
 *
 */
void irlmp_check_services( DISCOVERY *discovery) 
{
        struct irlmp_registration *entry;
        struct irmanager_event event;
        __u8 *service;
        int i = 0;

        DEBUG(1, "IrDA Discovered: %s\n", discovery->info);
        DEBUG(1, "    Services: ");

        service = irlmp_hint_to_service( discovery->hint);
        if (service != NULL) {
                /*
                 *  Check all services on the device
                 */
                while ( service[i] != S_END) {
                        DEBUG( 4, "service=%02x\n", service[i]);
                        entry = hashbin_find( irlmp->registry, 
                                              service[i], NULL);
                        if ( entry && entry->discovery_callback) {
                                DEBUG( 4, "discovery_callback!\n");
                                entry->discovery_callback( discovery);
                        } else {
                                /* 
                                 * Found no clients for dealing with this
                                 * service, so ask the user space irmanager
                                 * to try to load the right module for us
                                 */

                                event.event = EVENT_DEVICE_DISCOVERED;
                                event.service = service[i];
                                event.daddr = discovery->daddr;
                                sprintf( event.info, "%s", 
                                         discovery->info);
                                irmanager_notify( &event);
                        }
                        i++; /* Next service */
                }
                kfree( service);
        }
}

/*
 * Function irlmp_discovery_confirm ( self, log)
 *
 *    Some device(s) answered to our discovery request! Check to see which
 *    device it is, and give indication to the client(s)
 * 
 */
void irlmp_discovery_confirm( struct lap_cb *self, hashbin_t *log) 
{
        DISCOVERY *discovery;
        
        DEBUG( 4, __FUNCTION__ "()\n");
        
        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LAP_MAGIC, return;);

        /*
         *  Now, check all discovered devices (if any)
         */
        discovery = ( DISCOVERY *) hashbin_get_first( log);
        while ( discovery != NULL) {
                self->daddr = discovery->daddr;

                DEBUG( 4, "discovery->daddr = 0x%08x\n", discovery->daddr); 
                
                irlmp_check_services( discovery);

                discovery = ( DISCOVERY *) hashbin_get_next( log);
        }
}

/*
 * Function irlmp_discovery_indication (discovery)
 *
 *    A remote device is discovering us!
 *
 */
void irlmp_discovery_indication( struct lap_cb *self, DISCOVERY *discovery)
{
        /* struct irda_event event; */

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LAP_MAGIC, return;);
        ASSERT( discovery != NULL, return;);

        DEBUG( 4, __FUNCTION__ "()\n");

        DEBUG( 4, "discovery->daddr = 0x%08x\n", discovery->daddr); 
        self->daddr = discovery->daddr;

        ASSERT( self->cachelog != NULL, return;);

        /*
         *  Insert this discovery device into the discovery_log if its
         *  not there already
         */
        if ( !hashbin_find( self->cachelog, discovery->daddr, NULL))
                hashbin_insert( self->cachelog, (QUEUE *) discovery,
                                discovery->daddr, NULL);

        irlmp_check_services( discovery);
}

/*
 * Function irlmp_get_discovery_response ()
 *
 *    Used by IrLAP to get the disocvery info it needs when answering
 *    discovery requests by other devices.
 */
DISCOVERY *irlmp_get_discovery_response()
{
        DEBUG( 4, "irlmp_get_discovery_response()\n");

        ASSERT( irlmp != NULL, return NULL;);

        irlmp->discovery_rsp.hint[0] = irlmp->hint[0];
        irlmp->discovery_rsp.hint[1] = irlmp->hint[1];

        /* 
         *  Set character set for device name (we use ASCII), and 
         *  copy device name. Remember to make room for a \0 at the 
         *  end
         */
        irlmp->discovery_rsp.charset = CS_ASCII;

        strncpy( irlmp->discovery_rsp.info, sysctl_devname, 31);
        irlmp->discovery_rsp.info_len = strlen( irlmp->discovery_rsp.info) + 2;

        return &irlmp->discovery_rsp;
}

/*
 * Function irlmp_data_request (self, skb)
 *
 *    Send some data to peer device
 *
 */
void irlmp_data_request( struct lsap_cb *self, struct sk_buff *skb) 
{
        DEBUG( 4, __FUNCTION__ "()\n"); 

        ASSERT( skb != NULL, return;);
        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        
        /* Make room for MUX header */
        ASSERT( skb_headroom( skb) >= LMP_HEADER, return;);
        skb_push( skb, LMP_HEADER);

        irlmp_do_lsap_event( self, LM_DATA_REQUEST, skb);
}

/*
 * Function irlmp_data_indication (handle, skb)
 *
 *    Got data from LAP layer so pass it up to upper layer
 *
 */
void irlmp_data_indication( struct lsap_cb *self, struct sk_buff *skb) 
{
        DEBUG( 4, __FUNCTION__ "()\n"); 

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( skb != NULL, return;);

        /* Hide LMP header from layer above */
        skb_pull( skb, LMP_HEADER);

        if ( self->notify.data_indication)
                self->notify.data_indication(self->notify.instance, self, skb);
}

/*
 * Function irlmp_udata_request (self, skb)
 *
 *    
 *
 */
inline void irlmp_udata_request( struct lsap_cb *self, struct sk_buff *skb) 
{
        DEBUG( 4, __FUNCTION__ "()\n"); 

        ASSERT( skb != NULL, return;);
        
        /* Make room for MUX header */
        ASSERT( skb_headroom( skb) >= LMP_HEADER, return;);
        skb_push( skb, LMP_HEADER);

        irlmp_do_lsap_event( self, LM_UDATA_REQUEST, skb);
}

/*
 * Function irlmp_udata_indication (self, skb)
 *
 *    Send unreliable data (but still within the connection)
 *
 */
void irlmp_udata_indication( struct lsap_cb *self, struct sk_buff *skb) 
{
        DEBUG( 4, __FUNCTION__ "()\n"); 

        ASSERT( self != NULL, return;);
        ASSERT( self->magic == LMP_LSAP_MAGIC, return;);
        ASSERT( skb != NULL, return;);

        /* Hide LMP header from layer above */
        skb_pull( skb, LMP_HEADER);

        if ( self->notify.udata_indication)
                self->notify.udata_indication( self->notify.instance, self, 
                                              skb);
}

/*
 * Function irlmp_connection_less_data_request (skb)
 *
 *    Send out of connection UI frames
 *
 */
void irlmp_connectionless_data_request( struct sk_buff *skb)
{
        DEBUG( 1, __FUNCTION__ "(), Sorry not implemented\n"); 
}

/*
 * Function irlmp_connection_less_data_indication (skb)
 *
 *    
 *
 */
void irlmp_connectionless_data_indication( struct sk_buff *skb)
{
        DEBUG( 1, __FUNCTION__ "()\n"); 
}

void irlmp_status_request(void) 
{
        DEBUG( 1, "irlmp_status_request(), Not implemented\n");
}

void irlmp_status_indication( LINK_STATUS link, LOCK_STATUS lock) 
{
        DEBUG( 4, "irlmp_status_indication(), Not implemented\n");
}

/*
 * Function irlmp_hint_to_service (hint)
 *
 *    Returns a list of all servics contained in the given hint bits. This
 *    funtion assumes that the hint bits have the size of two bytes only
 */
__u8 *irlmp_hint_to_service(__u8 *hint)
{
        __u8 *service;
        int i = 0;

        /* 
         * Allocate array to store services in. 16 entries should be safe 
         * since we currently only support 2 hint bytes
         */
        service = kmalloc( 16, GFP_ATOMIC);
        if ( !service) {
                DEBUG(1, __FUNCTION__ "(), Unable to kmalloc!\n");
                return NULL;
        }

        if ( !hint[0]) {
                DEBUG(1, "<None>\n");
                return NULL;
        }
        if ( hint[0] & HINT_PNP)
                DEBUG(1, "PnP Compatible ");
        if ( hint[0] & HINT_PDA)
                DEBUG(1, "PDA/Palmtop ");
        if ( hint[0] & HINT_COMPUTER)
                DEBUG(1, "Computer ");
        if ( hint[0] & HINT_PRINTER) {
                DEBUG(1, "Printer ");
                service[i++] = S_PRINTER;
        }
        if ( hint[0] & HINT_MODEM)
                DEBUG(1, "Modem ");
        if ( hint[0] & HINT_FAX)
                DEBUG(1, "Fax ");
        if ( hint[0] & HINT_LAN) {
                DEBUG(1, "LAN Access ");                
                service[i++] = S_LAN;
        }
        /* 
         *  Test if extension byte exists. This byte will usually be
         *  there, but this is not really required by the standard.
         *  (IrLMP p. 29)
         */
        if ( hint[0] & HINT_EXTENSION) {
                if ( hint[1] & HINT_TELEPHONY) {
                        DEBUG(1, "Telephony ");
                        service[i++] = S_TELEPHONY;
                } if ( hint[1] & HINT_FILE_SERVER)
                        DEBUG(1, "File Server ");
                
                if ( hint[1] & HINT_COMM) {
                        DEBUG(1, "IrCOMM ");
                        service[i++] = S_COMM;
                }
                if ( hint[1] & HINT_OBEX) {
                        DEBUG(1, "IrOBEX ");
                        service[i++] = S_OBEX;
                }
        }
        DEBUG(1, "\n");

        service[i] = S_END;
        
        return service;
}

/*
 * Function irlmp_service_to_hint (service, hint)
 *
 *    
 *
 */
void irlmp_service_to_hint( int service, __u8 *hint)
{
        switch (service) {
        case S_PNP:
                hint[0] |= HINT_PNP;
                break;
        case S_PDA:
                hint[0] |= HINT_PDA;
                break;
        case S_COMPUTER:
                hint[0] |= HINT_COMPUTER;
                break;
        case S_PRINTER:
                hint[0] |= HINT_PRINTER;
                break;
        case S_MODEM:
                hint[0] |= HINT_PRINTER;
                break;
        case S_LAN:
                hint[0] |= HINT_LAN;
                break;
        case S_COMM:
                hint[0] |= HINT_EXTENSION;
                hint[1] |= HINT_COMM;
                break;
        case S_OBEX:
                hint[0] |= HINT_EXTENSION;
                hint[1] |= HINT_OBEX;
                break;
        default:
                DEBUG( 1, __FUNCTION__ "(), Unknown service!\n");
                break;
        }
}

/*
 * Function irlmp_register (service, type, callback)
 *
 *    Register a local client or server with IrLMP
 *
 */
void irlmp_register_layer( int service, int type, int do_discovery, 
                           DISCOVERY_CALLBACK callback)
{
        struct irlmp_registration *entry;

        sysctl_discovery |= do_discovery;

        if ( type & SERVER)
                irlmp_service_to_hint( service, irlmp->hint);

        /* Check if this service has been registred before */
        entry = hashbin_find( irlmp->registry, service, NULL);
        if ( entry != NULL) {
                /* Update type in entry */
                entry->type |= type;

                /*  Update callback only if client, since servers don't 
                 *  use callbacks, and we don't want to overwrite a 
                 *  previous registred client callback
                 */
                if ( type & CLIENT)
                        entry->discovery_callback = callback;
                return;
        }

        /* Make a new registration */
        entry = kmalloc( sizeof( struct irlmp_registration), GFP_ATOMIC);
        if ( !entry) {
                DEBUG( 1, __FUNCTION__ "(), Unable to kmalloc!\n");
                return;
        }

        entry->service = service;
        entry->type = type;
        entry->discovery_callback = callback;

        hashbin_insert( irlmp->registry, (QUEUE*) entry, entry->service, NULL);
}

/*
 * Function irlmp_unregister (serivice)
 *
 *    
 *
 */
void irlmp_unregister_layer( int service, int type)
{
        struct irlmp_registration *entry;
 
        DEBUG( 4, __FUNCTION__ "()\n");
 
        entry = hashbin_find( irlmp->registry, service, NULL);
        if ( entry != NULL) {
                DEBUG( 4, "Found entry to change or remove!\n");
                /* Remove this type from the service registration */
                entry->type &= ~type;
        }

        if ( !entry) {
                DEBUG( 1, __FUNCTION__ "Unable to find entry to unregister!\n");
                return;
        }

        /* 
         *  Remove entry if there is no more client and server support 
         *  left in entry
         */
        if ( !entry->type) {
                DEBUG( 4, __FUNCTION__ "(), removing entry!\n");
                entry = hashbin_remove( irlmp->registry, service, NULL);
                if ( entry != NULL)
                        kfree( entry);
        }

        /* Remove old hint bits */
        irlmp->hint[0] = 0;
        irlmp->hint[1] = 0;

        /* Refresh current hint bits */
        entry = (struct irlmp_registration *) hashbin_get_first( irlmp->registry);
        while( entry != NULL) {
                if ( entry->type & SERVER)
                        irlmp_service_to_hint( entry->service, 
                                               irlmp->hint);
                entry = (struct irlmp_registration *) 
                        hashbin_get_next( irlmp->registry);
        }
}

/*
 * Function irlmp_slsap_inuse (slsap)
 *
 *    Check if the given source LSAP selector is in use
 */
int irlmp_slsap_inuse( __u8 slsap_sel)
{
        struct lsap_cb *self;
        struct lap_cb *lap;

        ASSERT( irlmp != NULL, return TRUE;);
        ASSERT( irlmp->magic == LMP_MAGIC, return TRUE;);
        ASSERT( slsap_sel != LSAP_ANY, return TRUE;);

        DEBUG( 4, __FUNCTION__ "()\n");

        /*
         *  Check if slsap is already in use. To do this we have to loop over
         *  every IrLAP connection and check every LSAP assosiated with each
         *  the connection.
         */
        lap = ( struct lap_cb *) hashbin_get_first( irlmp->links);
        while ( lap != NULL) {
                ASSERT( lap->magic == LMP_LAP_MAGIC, return TRUE;);

                self = (struct lsap_cb *) hashbin_get_first( lap->lsaps);
                while ( self != NULL) {
                        ASSERT( self->magic == LMP_LSAP_MAGIC, return TRUE;);

                        if (( self->slsap_sel == slsap_sel))/*  &&  */
/*                          ( self->dlsap_sel == LSAP_ANY)) */
                        {
                                DEBUG( 4, "Source LSAP selector=%02x in use\n",
                                       self->slsap_sel); 
                                return TRUE;
                        }
                        self = (struct lsap_cb*) hashbin_get_next( lap->lsaps);
                }
                lap = (struct lap_cb *) hashbin_get_next( irlmp->links);
        }     
        return FALSE;
}

/*
 * Function irlmp_find_free_slsap ()
 *
 *    Find a free source LSAP to use. This function is called if the service
 *    user has requested a source LSAP equal to LM_ANY
 */
__u8 irlmp_find_free_slsap(void) 
{
        __u8 lsap_sel;

        ASSERT( irlmp != NULL, return -1;);
        ASSERT( irlmp->magic == LMP_MAGIC, return -1;);
      
        lsap_sel = irlmp->free_lsap_sel++;

        DEBUG( 4, __FUNCTION__ "(), next free lsap_sel=%02x\n", lsap_sel);

        return lsap_sel;
}

/*
 * Function irlmp_convert_lap_reason (lap_reason)
 *
 *    Converts IrLAP disconnect reason codes to IrLMP disconnect reason
 *    codes
 *
 */
LM_REASON irlmp_convert_lap_reason( LAP_REASON lap_reason)
{
        int reason = LM_LAP_DISCONNECT;

        switch (lap_reason) {           
        case LAP_DISC_INDICATION: /* Received a disconnect request from peer */
                DEBUG( 1, __FUNCTION__ "(), LAP_DISC_INDICATION\n");
                reason = LM_USER_REQUEST;
                break;
        case LAP_NO_RESPONSE:    /* To many retransmits without response */
                DEBUG( 1, __FUNCTION__ "(), LAP_NO_RESPONSE\n");
                reason = LM_LAP_DISCONNECT;
                break;
        case LAP_RESET_INDICATION:
                DEBUG( 1, __FUNCTION__ "(), LAP_RESET_INDICATION\n");
                reason = LM_LAP_RESET;
                break;
        case LAP_FOUND_NONE:
        case LAP_MEDIA_BUSY:
        case LAP_PRIMARY_CONFLICT:
                DEBUG( 1, __FUNCTION__ "(), LAP_FOUND_NONE, LAP_MEDIA_BUSY or LAP_PRIMARY_CONFLICT\n");
                reason = LM_CONNECT_FAILURE;
                break;
        default:
                DEBUG( 1, __FUNCTION__ 
                       "(), Unknow IrLAP disconnect reason %d!\n", lap_reason);
                reason = LM_LAP_DISCONNECT;
                break;
        }

        return reason;
}       

__u32 irlmp_get_saddr(struct lsap_cb *self)
{
        DEBUG(0, __FUNCTION__ "()\n");

        ASSERT(self != NULL, return 0;);
        ASSERT(self->lap != NULL, return 0;);

        return self->lap->saddr;
}

__u32 irlmp_get_daddr(struct lsap_cb *self)
{
        DEBUG(0, __FUNCTION__ "()\n");

        ASSERT(self != NULL, return 0;);
        ASSERT(self->lap != NULL, return 0;);
        
        return self->lap->daddr;
}

#ifdef CONFIG_PROC_FS
/*
 * Function irlmp_proc_read (buf, start, offset, len, unused)
 *
 *    Give some info to the /proc file system
 *
 */
int irlmp_proc_read( char *buf, char **start, off_t offset, int len, 
                     int unused)
{
        struct lsap_cb *self;
        struct lap_cb *lap;
        unsigned long flags;

        ASSERT( irlmp != NULL, return 0;);
        
        save_flags( flags);
        cli();

        len = 0;
        
        len += sprintf( buf+len, "Unconnected LSAPs:\n");
        self = (struct lsap_cb *) hashbin_get_first( irlmp->unconnected_lsaps);
        while ( self != NULL) {
                ASSERT( self->magic == LMP_LSAP_MAGIC, return 0;);
                len += sprintf( buf+len, "lsap state: %s, ", 
                                irlsap_state[ self->lsap_state]);
                len += sprintf( buf+len, 
                                "slsap_sel: %#02x, dlsap_sel: %#02x, ",
                                self->slsap_sel, self->dlsap_sel); 
                len += sprintf( buf+len, "(%s)", self->notify.name);
                len += sprintf( buf+len, "\n");

                self = ( struct lsap_cb *) hashbin_get_next( 
                        irlmp->unconnected_lsaps);
        } 

        len += sprintf( buf+len, "\nRegistred Link Layers:\n");
        lap = (struct lap_cb *) hashbin_get_first( irlmp->links);
        while ( lap != NULL) {
                ASSERT( lap->magic == LMP_LAP_MAGIC, return 0;);

                len += sprintf( buf+len, "lap state: %s, ", 
                                irlmp_state[ lap->lap_state]);

                len += sprintf( buf+len, "saddr: %#08x, daddr: %#08x, ",
                                lap->saddr, lap->daddr); 
                len += sprintf( buf+len, "\n");

                len += sprintf( buf+len, "\nConnected LSAPs:\n");
                self = (struct lsap_cb *) hashbin_get_first( lap->lsaps);
                while ( self != NULL) {
                        ASSERT( self->magic == LMP_LSAP_MAGIC, return 0;);
                        len += sprintf( buf+len, "lsap state: %s, ", 
                                        irlsap_state[ self->lsap_state]);
                        len += sprintf( buf+len, 
                                        "slsap_sel: %#02x, dlsap_sel: %#02x, ",
                                        self->slsap_sel, self->dlsap_sel);
                        len += sprintf( buf+len, "(%s)", self->notify.name);
                        len += sprintf( buf+len, "\n");
                        
                        self = ( struct lsap_cb *) hashbin_get_next( 
                                lap->lsaps);
                } 

                lap = ( struct lap_cb *) hashbin_get_next( 
                        irlmp->links);
        } 

        restore_flags( flags);

        return len;
}

#endif /* PROC_FS */