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irlmp.c
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/*********************************************************************
*
* Filename: irlmp.c
* Version: 1.0
* Description: IrDA Link Management Protocol (LMP) layer
* Status: Stable.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Aug 17 20:54:32 1997
* Modified at: Wed Jan 5 11:26:03 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
* Copyright (c) 2000-2003 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.
*
* 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/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/random.h>
#include <linux/seq_file.h>
#include <net/irda/irda.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 <asm/unaligned.h>
static __u8 irlmp_find_free_slsap(void);
static int irlmp_slsap_inuse(__u8 slsap_sel);
/* Master structure */
struct irlmp_cb *irlmp = NULL;
/* These can be altered by the sysctl interface */
int sysctl_discovery = 0;
int sysctl_discovery_timeout = 3; /* 3 seconds by default */
int sysctl_discovery_slots = 6; /* 6 slots by default */
int sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;
char sysctl_devname[65];
const char *irlmp_reasons[] = {
"ERROR, NOT USED",
"LM_USER_REQUEST",
"LM_LAP_DISCONNECT",
"LM_CONNECT_FAILURE",
"LM_LAP_RESET",
"LM_INIT_DISCONNECT",
"ERROR, NOT USED",
};
/*
* Function irlmp_init (void)
*
* Create (allocate) the main IrLMP structure
*
*/
int __init irlmp_init(void)
{
IRDA_DEBUG(1, "%s()\n", __func__);
/* Initialize the irlmp structure. */
irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
if (irlmp == NULL)
return -ENOMEM;
irlmp->magic = LMP_MAGIC;
irlmp->clients = hashbin_new(HB_LOCK);
irlmp->services = hashbin_new(HB_LOCK);
irlmp->links = hashbin_new(HB_LOCK);
irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
irlmp->cachelog = hashbin_new(HB_NOLOCK);
if ((irlmp->clients == NULL) ||
(irlmp->services == NULL) ||
(irlmp->links == NULL) ||
(irlmp->unconnected_lsaps == NULL) ||
(irlmp->cachelog == NULL)) {
return -ENOMEM;
}
spin_lock_init(&irlmp->cachelog->hb_spinlock);
irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
strcpy(sysctl_devname, "Linux");
init_timer(&irlmp->discovery_timer);
/* Do discovery every 3 seconds, conditionally */
if (sysctl_discovery)
irlmp_start_discovery_timer(irlmp,
sysctl_discovery_timeout*HZ);
return 0;
}
/*
* Function irlmp_cleanup (void)
*
* Remove IrLMP layer
*
*/
void irlmp_cleanup(void)
{
/* Check for main structure */
IRDA_ASSERT(irlmp != NULL, return;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
del_timer(&irlmp->discovery_timer);
hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
hashbin_delete(irlmp->cachelog, (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, notify_t *notify, __u8 pid)
{
struct lsap_cb *self;
IRDA_ASSERT(notify != NULL, return NULL;);
IRDA_ASSERT(irlmp != NULL, return NULL;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
IRDA_ASSERT(notify->instance != NULL, return NULL;);
/* Does the client care which Source LSAP selector it gets? */
if (slsap_sel == LSAP_ANY) {
slsap_sel = irlmp_find_free_slsap();
if (!slsap_sel)
return NULL;
} else if (irlmp_slsap_inuse(slsap_sel))
return NULL;
/* Allocate new instance of a LSAP connection */
self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
if (self == NULL) {
IRDA_ERROR("%s: can't allocate memory\n", __func__);
return NULL;
}
self->magic = LMP_LSAP_MAGIC;
self->slsap_sel = slsap_sel;
/* Fix connectionless LSAP's */
if (slsap_sel == LSAP_CONNLESS) {
#ifdef CONFIG_IRDA_ULTRA
self->dlsap_sel = LSAP_CONNLESS;
self->pid = pid;
#endif /* CONFIG_IRDA_ULTRA */
} else
self->dlsap_sel = LSAP_ANY;
/* self->connected = FALSE; -> already NULL via memset() */
init_timer(&self->watchdog_timer);
self->notify = *notify;
self->lsap_state = LSAP_DISCONNECTED;
/* Insert into queue of unconnected LSAPs */
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
(long) self, NULL);
return self;
}
EXPORT_SYMBOL(irlmp_open_lsap);
/*
* Function __irlmp_close_lsap (self)
*
* Remove an instance of LSAP
*/
static void __irlmp_close_lsap(struct lsap_cb *self)
{
IRDA_DEBUG(4, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
/*
* Set some of the variables to preset values
*/
self->magic = 0;
del_timer(&self->watchdog_timer); /* Important! */
if (self->conn_skb)
dev_kfree_skb(self->conn_skb);
kfree(self);
}
/*
* Function irlmp_close_lsap (self)
*
* Close and remove LSAP
*
*/
void irlmp_close_lsap(struct lsap_cb *self)
{
struct lap_cb *lap;
struct lsap_cb *lsap = NULL;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
/*
* Find out if we should remove this LSAP from a link or from the
* list of unconnected lsaps (not associated with a link)
*/
lap = self->lap;
if (lap) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
/* We might close a LSAP before it has completed the
* connection setup. In those case, higher layers won't
* send a proper disconnect request. Harmless, except
* that we will forget to close LAP... - Jean II */
if(self->lsap_state != LSAP_DISCONNECTED) {
self->lsap_state = LSAP_DISCONNECTED;
irlmp_do_lap_event(self->lap,
LM_LAP_DISCONNECT_REQUEST, NULL);
}
/* Now, remove from the link */
lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
lap->cache.valid = FALSE;
#endif
}
self->lap = NULL;
/* Check if we found the LSAP! If not then try the unconnected lsaps */
if (!lsap) {
lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
NULL);
}
if (!lsap) {
IRDA_DEBUG(0,
"%s(), Looks like somebody has removed me already!\n",
__func__);
return;
}
__irlmp_close_lsap(self);
}
EXPORT_SYMBOL(irlmp_close_lsap);
/*
* 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_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
{
struct lap_cb *lap;
IRDA_ASSERT(irlmp != NULL, return;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
IRDA_ASSERT(notify != NULL, return;);
/*
* Allocate new instance of a LSAP connection
*/
lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
if (lap == NULL) {
IRDA_ERROR("%s: unable to kmalloc\n", __func__);
return;
}
lap->irlap = irlap;
lap->magic = LMP_LAP_MAGIC;
lap->saddr = saddr;
lap->daddr = DEV_ADDR_ANY;
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
lap->cache.valid = FALSE;
#endif
lap->lsaps = hashbin_new(HB_LOCK);
if (lap->lsaps == NULL) {
IRDA_WARNING("%s(), unable to kmalloc lsaps\n", __func__);
kfree(lap);
return;
}
lap->lap_state = LAP_STANDBY;
init_timer(&lap->idle_timer);
/*
* Insert into queue of LMP links
*/
hashbin_insert(irlmp->links, (irda_queue_t *) 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_link(__u32 saddr)
{
struct lap_cb *link;
IRDA_DEBUG(4, "%s()\n", __func__);
/* We must remove ourselves from the hashbin *first*. This ensure
* that no more LSAPs will be open on this link and no discovery
* will be triggered anymore. Jean II */
link = hashbin_remove(irlmp->links, saddr, NULL);
if (link) {
IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);
/* Kill all the LSAPs on this link. Jean II */
link->reason = LAP_DISC_INDICATION;
link->daddr = DEV_ADDR_ANY;
irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);
/* Remove all discoveries discovered at this link */
irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);
/* Final cleanup */
del_timer(&link->idle_timer);
link->magic = 0;
hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
kfree(link);
}
}
/*
* 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 *tx_skb = userdata;
struct lap_cb *lap;
struct lsap_cb *lsap;
int ret;
IRDA_ASSERT(self != NULL, return -EBADR;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);
IRDA_DEBUG(2,
"%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
__func__, self->slsap_sel, dlsap_sel, saddr, daddr);
if (test_bit(0, &self->connected)) {
ret = -EISCONN;
goto err;
}
/* Client must supply destination device address */
if (!daddr) {
ret = -EINVAL;
goto err;
}
/* Any userdata? */
if (tx_skb == NULL) {
tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
if (!tx_skb)
return -ENOMEM;
skb_reserve(tx_skb, LMP_MAX_HEADER);
}
/* Make room for MUX control header (3 bytes) */
IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
skb_push(tx_skb, LMP_CONTROL_HEADER);
self->dlsap_sel = dlsap_sel;
/*
* 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) || (saddr == DEV_ADDR_ANY)) {
discovery_t *discovery;
unsigned long flags;
spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
if (daddr != DEV_ADDR_ANY)
discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
else {
IRDA_DEBUG(2, "%s(), no daddr\n", __func__);
discovery = (discovery_t *)
hashbin_get_first(irlmp->cachelog);
}
if (discovery) {
saddr = discovery->data.saddr;
daddr = discovery->data.daddr;
}
spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
}
lap = hashbin_lock_find(irlmp->links, saddr, NULL);
if (lap == NULL) {
IRDA_DEBUG(1, "%s(), Unable to find a usable link!\n", __func__);
ret = -EHOSTUNREACH;
goto err;
}
/* Check if LAP is disconnected or already connected */
if (lap->daddr == DEV_ADDR_ANY)
lap->daddr = daddr;
else if (lap->daddr != daddr) {
/* Check if some LSAPs are active on this LAP */
if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
/* No active connection, but LAP hasn't been
* disconnected yet (waiting for timeout in LAP).
* Maybe we could give LAP a bit of help in this case.
*/
IRDA_DEBUG(0, "%s(), sorry, but I'm waiting for LAP to timeout!\n", __func__);
ret = -EAGAIN;
goto err;
}
/* LAP is already connected to a different node, and LAP
* can only talk to one node at a time */
IRDA_DEBUG(0, "%s(), sorry, but link is busy!\n", __func__);
ret = -EBUSY;
goto err;
}
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, (long) self, NULL);
IRDA_ASSERT(lsap != NULL, return -1;);
IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(lsap->lap != NULL, return -1;);
IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);
hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
NULL);
set_bit(0, &self->connected); /* TRUE */
/*
* User supplied qos specifications?
*/
if (qos)
self->qos = *qos;
irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(tx_skb);
return 0;
err:
/* Cleanup */
if(tx_skb)
dev_kfree_skb(tx_skb);
return ret;
}
EXPORT_SYMBOL(irlmp_connect_request);
/*
* Function irlmp_connect_indication (self)
*
* Incoming connection
*
*/
void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
{
int max_seg_size;
int lap_header_size;
int max_header_size;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(self->lap != NULL, return;);
IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Note : self->lap is set in irlmp_link_data_indication(),
* (case CONNECT_CMD:) because we have no way to set it here.
* Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
* Jean II */
self->qos = *self->lap->qos;
max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
max_header_size = LMP_HEADER + lap_header_size;
/* Hide LMP_CONTROL_HEADER header from layer above */
skb_pull(skb, LMP_CONTROL_HEADER);
if (self->notify.connect_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
skb_get(skb);
self->notify.connect_indication(self->notify.instance, self,
&self->qos, max_seg_size,
max_header_size, skb);
}
}
/*
* Function irlmp_connect_response (handle, userdata)
*
* Service user is accepting connection
*
*/
int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
{
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(userdata != NULL, return -1;);
/* We set the connected bit and move the lsap to the connected list
* in the state machine itself. Jean II */
IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Make room for MUX control header (3 bytes) */
IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
skb_push(userdata, LMP_CONTROL_HEADER);
irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
return 0;
}
EXPORT_SYMBOL(irlmp_connect_response);
/*
* 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_header_size;
int lap_header_size;
int max_seg_size;
IRDA_DEBUG(3, "%s()\n", __func__);
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(self->lap != NULL, return;);
self->qos = *self->lap->qos;
max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
max_header_size = LMP_HEADER + lap_header_size;
IRDA_DEBUG(2, "%s(), max_header_size=%d\n",
__func__, max_header_size);
/* Hide LMP_CONTROL_HEADER header from layer above */
skb_pull(skb, LMP_CONTROL_HEADER);
if (self->notify.connect_confirm) {
/* Don't forget to refcount it - see irlap_driver_rcv() */
skb_get(skb);
self->notify.connect_confirm(self->notify.instance, self,
&self->qos, max_seg_size,
max_header_size, skb);
}
}
/*
* Function irlmp_dup (orig, instance)
*
* Duplicate LSAP, can be used by servers to confirm a connection on a
* new LSAP so it can keep listening on the old one.
*
*/
struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
{
struct lsap_cb *new;
unsigned long flags;
IRDA_DEBUG(1, "%s()\n", __func__);
spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
/* Only allowed to duplicate unconnected LSAP's, and only LSAPs
* that have received a connect indication. Jean II */
if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
(orig->lap == NULL)) {
IRDA_DEBUG(0, "%s(), invalid LSAP (wrong state)\n",
__func__);
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
flags);
return NULL;
}
/* Allocate a new instance */
new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
if (!new) {
IRDA_DEBUG(0, "%s(), unable to kmalloc\n", __func__);
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
flags);
return NULL;
}
/* new->lap = orig->lap; => done in the memcpy() */
/* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
new->conn_skb = NULL;
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
/* Not everything is the same */
new->notify.instance = instance;
init_timer(&new->watchdog_timer);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
(long) new, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
/* Make sure that we invalidate the LSAP cache */
new->lap->cache.valid = FALSE;
#endif /* CONFIG_IRDA_CACHE_LAST_LSAP */
return new;
}
/*
* Function irlmp_disconnect_request (handle, userdata)
*
* The service user is requesting disconnection, this will not remove the
* LSAP, but only mark it as disconnected
*/
int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
{
struct lsap_cb *lsap;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(userdata != NULL, return -1;);
/* Already disconnected ?
* There is a race condition between irlmp_disconnect_indication()
* and us that might mess up the hashbins below. This fixes it.
* Jean II */
if (! test_and_clear_bit(0, &self->connected)) {
IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
dev_kfree_skb(userdata);
return -1;
}
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);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
/*
* Remove LSAP from list of connected LSAPs for the particular link
* and insert it into the list of unconnected LSAPs
*/
IRDA_ASSERT(self->lap != NULL, return -1;);
IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
self->lap->cache.valid = FALSE;
#endif
IRDA_ASSERT(lsap != NULL, return -1;);
IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(lsap == self, return -1;);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
(long) self, NULL);
/* Reset some values */
self->dlsap_sel = LSAP_ANY;
self->lap = NULL;
return 0;
}
EXPORT_SYMBOL(irlmp_disconnect_request);
/*
* Function irlmp_disconnect_indication (reason, userdata)
*
* LSAP is being closed!
*/
void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
struct sk_buff *skb)
{
struct lsap_cb *lsap;
IRDA_DEBUG(1, "%s(), reason=%s\n", __func__, irlmp_reasons[reason]);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_DEBUG(3, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Already disconnected ?
* There is a race condition between irlmp_disconnect_request()
* and us that might mess up the hashbins below. This fixes it.
* Jean II */
if (! test_and_clear_bit(0, &self->connected)) {
IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
return;
}
/*
* Remove association between this LSAP and the link it used
*/
IRDA_ASSERT(self->lap != NULL, return;);
IRDA_ASSERT(self->lap->lsaps != NULL, return;);
lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
self->lap->cache.valid = FALSE;
#endif
IRDA_ASSERT(lsap != NULL, return;);
IRDA_ASSERT(lsap == self, return;);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
(long) lsap, NULL);
self->dlsap_sel = LSAP_ANY;
self->lap = NULL;
/*
* Inform service user
*/
if (self->notify.disconnect_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
if(skb)
skb_get(skb);
self->notify.disconnect_indication(self->notify.instance,
self, reason, skb);
} else {
IRDA_DEBUG(0, "%s(), no handler\n", __func__);
}
}
/*
* Function irlmp_do_expiry (void)
*
* Do a cleanup of the discovery log (remove old entries)
*
* Note : separate from irlmp_do_discovery() so that we can handle
* passive discovery properly.
*/
void irlmp_do_expiry(void)
{
struct lap_cb *lap;
/*
* Expire discovery on all links which are *not* connected.
* On links which are connected, we can't do discovery
* anymore and can't refresh the log, so we freeze the
* discovery log to keep info about the device we are
* connected to.
* This info is mandatory if we want irlmp_connect_request()
* to work properly. - Jean II
*/
lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
while (lap != NULL) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
if (lap->lap_state == LAP_STANDBY) {
/* Expire discoveries discovered on this link */
irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
FALSE);
}
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
}
/*
* Function irlmp_do_discovery (nslots)
*
* Do some discovery on all links
*
* Note : log expiry is done above.
*/
void irlmp_do_discovery(int nslots)
{
struct lap_cb *lap;
__u16 *data_hintsp;
/* Make sure the value is sane */
if ((nslots != 1) && (nslots != 6) && (nslots != 8) && (nslots != 16)){
IRDA_WARNING("%s: invalid value for number of slots!\n",
__func__);
nslots = sysctl_discovery_slots = 8;
}
/* Construct new discovery info to be used by IrLAP, */
data_hintsp = (__u16 *) irlmp->discovery_cmd.data.hints;
put_unaligned(irlmp->hints.word, data_hintsp);
/*
* 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.data.charset = CS_ASCII;
strncpy(irlmp->discovery_cmd.data.info, sysctl_devname,
NICKNAME_MAX_LEN);
irlmp->discovery_cmd.name_len = strlen(irlmp->discovery_cmd.data.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) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
if (lap->lap_state == LAP_STANDBY) {
/* Try to discover */
irlmp_do_lap_event(lap, LM_LAP_DISCOVERY_REQUEST,
NULL);
}
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
}
/*
* Function irlmp_discovery_request (nslots)
*
* Do a discovery of devices in front of the computer
*
* If the caller has registered a client discovery callback, this
* allow him to receive the full content of the discovery log through
* this callback (as normally he will receive only new discoveries).
*/
void irlmp_discovery_request(int nslots)
{
/* Return current cached discovery log (in full) */
irlmp_discovery_confirm(irlmp->cachelog, DISCOVERY_LOG);
/*
* Start a single discovery operation if discovery is not already
* running
*/
if (!sysctl_discovery) {
/* Check if user wants to override the default */
if (nslots == DISCOVERY_DEFAULT_SLOTS)
nslots = sysctl_discovery_slots;
irlmp_do_discovery(nslots);
/* Note : we never do expiry here. Expiry will run on the
* discovery timer regardless of the state of sysctl_discovery
* Jean II */
}
}
EXPORT_SYMBOL(irlmp_discovery_request);
/*
* Function irlmp_get_discoveries (pn, mask, slots)
*
* Return the current discovery log
*
* If discovery is not enabled, you should call this function again
* after 1 or 2 seconds (i.e. after discovery has been done).
*/
struct irda_device_info *irlmp_get_discoveries(int *pn, __u16 mask, int nslots)
{
/* If discovery is not enabled, it's likely that the discovery log
* will be empty. So, we trigger a single discovery, so that next
* time the user call us there might be some results in the log.
* Jean II
*/
if (!sysctl_discovery) {
/* Check if user wants to override the default */
if (nslots == DISCOVERY_DEFAULT_SLOTS)
nslots = sysctl_discovery_slots;
/* Start discovery - will complete sometime later */
irlmp_do_discovery(nslots);
/* Note : we never do expiry here. Expiry will run on the
* discovery timer regardless of the state of sysctl_discovery
* Jean II */
}
/* Return current cached discovery log */
return(irlmp_copy_discoveries(irlmp->cachelog, pn, mask, TRUE));
}
EXPORT_SYMBOL(irlmp_get_discoveries);
/*
* Function irlmp_notify_client (log)
*
* Notify all about discovered devices
*
* Clients registered with IrLMP are :
* o IrComm
* o IrLAN
* o Any socket (in any state - ouch, that may be a lot !)
* The client may have defined a callback to be notified in case of
* partial/selective discovery based on the hints that it passed to IrLMP.
*/
static inline void
irlmp_notify_client(irlmp_client_t *client,
hashbin_t *log, DISCOVERY_MODE mode)
{
discinfo_t *discoveries; /* Copy of the discovery log */
int number; /* Number of nodes in the log */
int i;
IRDA_DEBUG(3, "%s()\n", __func__);
/* Check if client wants or not partial/selective log (optimisation) */
if (!client->disco_callback)
return;
/*
* Locking notes :
* the old code was manipulating the log directly, which was
* very racy. Now, we use copy_discoveries, that protects
* itself while dumping the log for us.
* The overhead of the copy is compensated by the fact that
* we only pass new discoveries in normal mode and don't
* pass the same old entry every 3s to the caller as we used
* to do (virtual function calling is expensive).
* Jean II
*/
/*
* Now, check all discovered devices (if any), and notify client
* only about the services that the client is interested in
* We also notify only about the new devices unless the caller
* explicitly request a dump of the log. Jean II
*/
discoveries = irlmp_copy_discoveries(log, &number,
client->hint_mask.word,
(mode == DISCOVERY_LOG));
/* Check if the we got some results */
if (discoveries == NULL)
return; /* No nodes discovered */
/* Pass all entries to the listener */
for(i = 0; i < number; i++)
client->disco_callback(&(discoveries[i]), mode, client->priv);