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linux/net/irda/irlmp.c
Arjan van de Ven da7071d7e3 [PATCH] mark struct file_operations const 8 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

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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", __FUNCTION__);
/* 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");
/* Do discovery every 3 seconds */
init_timer(&irlmp->discovery_timer);
irlmp_start_discovery_timer(irlmp, sysctl_discovery_timeout*HZ);
return 0;
}
/*
* Function irlmp_cleanup (void)
*
* Remove IrLMP layer
*
*/
void __exit 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", __FUNCTION__);
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", __FUNCTION__);
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",
__FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
/* 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;
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",
__FUNCTION__, 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", __FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
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",
__FUNCTION__, 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",
__FUNCTION__, 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", __FUNCTION__);
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",
__FUNCTION__, 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", __FUNCTION__);
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",
__FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__, 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",
__FUNCTION__, 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", __FUNCTION__);
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", __FUNCTION__);
}
}
/*
* 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",
__FUNCTION__);
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", __FUNCTION__);
/* 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);
/* Free up our buffer */
kfree(discoveries);
}
/*
* 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(hashbin_t *log, DISCOVERY_MODE mode)
{
irlmp_client_t *client;
irlmp_client_t *client_next;
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
IRDA_ASSERT(log != NULL, return;);
if (!(HASHBIN_GET_SIZE(log)))
return;
/* For each client - notify callback may touch client list */
client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
(void *) &client_next) ) {
/* Check if we should notify client */
irlmp_notify_client(client, log, mode);
client = client_next;
}
}
/*
* Function irlmp_discovery_expiry (expiry)
*
* This device is no longer been discovered, and therefore it is being
* purged from the discovery log. Inform all clients who have
* registered for this event...
*
* Note : called exclusively from discovery.c
* Note : this is no longer called under discovery spinlock, so the
* client can do whatever he wants in the callback.
*/
void irlmp_discovery_expiry(discinfo_t *expiries, int number)
{
irlmp_client_t *client;
irlmp_client_t *client_next;
int i;
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
IRDA_ASSERT(expiries != NULL, return;);
/* For each client - notify callback may touch client list */
client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
(void *) &client_next) ) {
/* Pass all entries to the listener */
for(i = 0; i < number; i++) {
/* Check if we should notify client */
if ((client->expir_callback) &&
(client->hint_mask.word & u16ho(expiries[i].hints)
& 0x7f7f) )
client->expir_callback(&(expiries[i]),
EXPIRY_TIMEOUT,
client->priv);
}
/* Next client */
client = client_next;
}
}
/*
* Function irlmp_get_discovery_response ()
*
* Used by IrLAP to get the discovery info it needs when answering
* discovery requests by other devices.
*/
discovery_t *irlmp_get_discovery_response(void)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(irlmp != NULL, return NULL;);
u16ho(irlmp->discovery_rsp.data.hints) = irlmp->hints.word;
/*
* 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.data.charset = CS_ASCII;
strncpy(irlmp->discovery_rsp.data.info, sysctl_devname,
NICKNAME_MAX_LEN);
irlmp->discovery_rsp.name_len = strlen(irlmp->discovery_rsp.data.info);
return &irlmp->discovery_rsp;
}
/*
* Function irlmp_data_request (self, skb)
*
* Send some data to peer device
*
* Note on skb management :
* After calling the lower layers of the IrDA stack, we always
* kfree() the skb, which drop the reference count (and potentially
* destroy it).
* IrLMP and IrLAP may queue the packet, and in those cases will need
* to use skb_get() to keep it around.
* Jean II
*/
int irlmp_data_request(struct lsap_cb *self, struct sk_buff *userdata)
{
int ret;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
/* Make room for MUX header */
IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
skb_push(userdata, LMP_HEADER);
ret = irlmp_do_lsap_event(self, LM_DATA_REQUEST, userdata);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
return ret;
}
EXPORT_SYMBOL(irlmp_data_request);
/*
* 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)
{
/* Hide LMP header from layer above */
skb_pull(skb, LMP_HEADER);
if (self->notify.data_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
skb_get(skb);
self->notify.data_indication(self->notify.instance, self, skb);
}
}
/*
* Function irlmp_udata_request (self, skb)
*/
int irlmp_udata_request(struct lsap_cb *self, struct sk_buff *userdata)
{
int ret;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(userdata != NULL, return -1;);
/* Make room for MUX header */
IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
skb_push(userdata, LMP_HEADER);
ret = irlmp_do_lsap_event(self, LM_UDATA_REQUEST, userdata);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
return ret;
}
/*
* 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)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
/* Hide LMP header from layer above */
skb_pull(skb, LMP_HEADER);
if (self->notify.udata_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
skb_get(skb);
self->notify.udata_indication(self->notify.instance, self,
skb);
}
}
/*
* Function irlmp_connless_data_request (self, skb)
*/
#ifdef CONFIG_IRDA_ULTRA
int irlmp_connless_data_request(struct lsap_cb *self, struct sk_buff *userdata,
__u8 pid)
{
struct sk_buff *clone_skb;
struct lap_cb *lap;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(userdata != NULL, return -1;);
/* Make room for MUX and PID header */
IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER+LMP_PID_HEADER,
return -1;);
/* Insert protocol identifier */
skb_push(userdata, LMP_PID_HEADER);
if(self != NULL)
userdata->data[0] = self->pid;
else
userdata->data[0] = pid;
/* Connectionless sockets must use 0x70 */
skb_push(userdata, LMP_HEADER);
userdata->data[0] = userdata->data[1] = LSAP_CONNLESS;
/* Try to send Connectionless packets out on all links */
lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
while (lap != NULL) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return -1;);
clone_skb = skb_clone(userdata, GFP_ATOMIC);
if (!clone_skb) {
dev_kfree_skb(userdata);
return -ENOMEM;
}
irlap_unitdata_request(lap->irlap, clone_skb);
/* irlap_unitdata_request() don't increase refcount,
* so no dev_kfree_skb() - Jean II */
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
dev_kfree_skb(userdata);
return 0;
}
#endif /* CONFIG_IRDA_ULTRA */
/*
* Function irlmp_connless_data_indication (self, skb)
*
* Receive unreliable data outside any connection. Mostly used by Ultra
*
*/
#ifdef CONFIG_IRDA_ULTRA
void irlmp_connless_data_indication(struct lsap_cb *self, struct sk_buff *skb)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
/* Hide LMP and PID header from layer above */
skb_pull(skb, LMP_HEADER+LMP_PID_HEADER);
if (self->notify.udata_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
skb_get(skb);
self->notify.udata_indication(self->notify.instance, self,
skb);
}
}
#endif /* CONFIG_IRDA_ULTRA */
/*
* Propagate status indication from LAP to LSAPs (via LMP)
* This don't trigger any change of state in lap_cb, lmp_cb or lsap_cb,
* and the event is stateless, therefore we can bypass both state machines
* and send the event direct to the LSAP user.
* Jean II
*/
void irlmp_status_indication(struct lap_cb *self,
LINK_STATUS link, LOCK_STATUS lock)
{
struct lsap_cb *next;
struct lsap_cb *curr;
/* Send status_indication to all LSAPs using this link */
curr = (struct lsap_cb *) hashbin_get_first( self->lsaps);
while (NULL != hashbin_find_next(self->lsaps, (long) curr, NULL,
(void *) &next) ) {
IRDA_ASSERT(curr->magic == LMP_LSAP_MAGIC, return;);
/*
* Inform service user if he has requested it
*/
if (curr->notify.status_indication != NULL)
curr->notify.status_indication(curr->notify.instance,
link, lock);
else
IRDA_DEBUG(2, "%s(), no handler\n", __FUNCTION__);
curr = next;
}
}
/*
* Receive flow control indication from LAP.
* LAP want us to send it one more frame. We implement a simple round
* robin scheduler between the active sockets so that we get a bit of
* fairness. Note that the round robin is far from perfect, but it's
* better than nothing.
* We then poll the selected socket so that we can do synchronous
* refilling of IrLAP (which allow to minimise the number of buffers).
* Jean II
*/
void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow)
{
struct lsap_cb *next;
struct lsap_cb *curr;
int lsap_todo;
IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
IRDA_ASSERT(flow == FLOW_START, return;);
/* Get the number of lsap. That's the only safe way to know
* that we have looped around... - Jean II */
lsap_todo = HASHBIN_GET_SIZE(self->lsaps);
IRDA_DEBUG(4, "%s() : %d lsaps to scan\n", __FUNCTION__, lsap_todo);
/* Poll lsap in order until the queue is full or until we
* tried them all.
* Most often, the current LSAP will have something to send,
* so we will go through this loop only once. - Jean II */
while((lsap_todo--) &&
(IRLAP_GET_TX_QUEUE_LEN(self->irlap) < LAP_HIGH_THRESHOLD)) {
/* Try to find the next lsap we should poll. */
next = self->flow_next;
/* If we have no lsap, restart from first one */
if(next == NULL)
next = (struct lsap_cb *) hashbin_get_first(self->lsaps);
/* Verify current one and find the next one */
curr = hashbin_find_next(self->lsaps, (long) next, NULL,
(void *) &self->flow_next);
/* Uh-oh... Paranoia */
if(curr == NULL)
break;
IRDA_DEBUG(4, "%s() : curr is %p, next was %p and is now %p, still %d to go - queue len = %d\n", __FUNCTION__, curr, next, self->flow_next, lsap_todo, IRLAP_GET_TX_QUEUE_LEN(self->irlap));
/* Inform lsap user that it can send one more packet. */
if (curr->notify.flow_indication != NULL)
curr->notify.flow_indication(curr->notify.instance,
curr, flow);
else
IRDA_DEBUG(1, "%s(), no handler\n", __FUNCTION__);
}
}
#if 0
/*
* Function irlmp_hint_to_service (hint)
*
* Returns a list of all servics contained in the given hint bits. This
* function 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) {
IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __FUNCTION__);
return NULL;
}
if (!hint[0]) {
IRDA_DEBUG(1, "<None>\n");
kfree(service);
return NULL;
}
if (hint[0] & HINT_PNP)
IRDA_DEBUG(1, "PnP Compatible ");
if (hint[0] & HINT_PDA)
IRDA_DEBUG(1, "PDA/Palmtop ");
if (hint[0] & HINT_COMPUTER)
IRDA_DEBUG(1, "Computer ");
if (hint[0] & HINT_PRINTER) {
IRDA_DEBUG(1, "Printer ");
service[i++] = S_PRINTER;
}
if (hint[0] & HINT_MODEM)
IRDA_DEBUG(1, "Modem ");
if (hint[0] & HINT_FAX)
IRDA_DEBUG(1, "Fax ");
if (hint[0] & HINT_LAN) {
IRDA_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) {
IRDA_DEBUG(1, "Telephony ");
service[i++] = S_TELEPHONY;
} if (hint[1] & HINT_FILE_SERVER)
IRDA_DEBUG(1, "File Server ");
if (hint[1] & HINT_COMM) {
IRDA_DEBUG(1, "IrCOMM ");
service[i++] = S_COMM;
}
if (hint[1] & HINT_OBEX) {
IRDA_DEBUG(1, "IrOBEX ");
service[i++] = S_OBEX;
}
}
IRDA_DEBUG(1, "\n");
/* So that client can be notified about any discovery */
service[i++] = S_ANY;
service[i] = S_END;
return service;
}
#endif
static const __u16 service_hint_mapping[S_END][2] = {
{ HINT_PNP, 0 }, /* S_PNP */
{ HINT_PDA, 0 }, /* S_PDA */
{ HINT_COMPUTER, 0 }, /* S_COMPUTER */
{ HINT_PRINTER, 0 }, /* S_PRINTER */
{ HINT_MODEM, 0 }, /* S_MODEM */
{ HINT_FAX, 0 }, /* S_FAX */
{ HINT_LAN, 0 }, /* S_LAN */
{ HINT_EXTENSION, HINT_TELEPHONY }, /* S_TELEPHONY */
{ HINT_EXTENSION, HINT_COMM }, /* S_COMM */
{ HINT_EXTENSION, HINT_OBEX }, /* S_OBEX */
{ 0xFF, 0xFF }, /* S_ANY */
};
/*
* Function irlmp_service_to_hint (service)
*
* Converts a service type, to a hint bit
*
* Returns: a 16 bit hint value, with the service bit set
*/
__u16 irlmp_service_to_hint(int service)
{
__u16_host_order hint;
hint.byte[0] = service_hint_mapping[service][0];
hint.byte[1] = service_hint_mapping[service][1];
return hint.word;
}
EXPORT_SYMBOL(irlmp_service_to_hint);
/*
* Function irlmp_register_service (service)
*
* Register local service with IrLMP
*
*/
void *irlmp_register_service(__u16 hints)
{
irlmp_service_t *service;
IRDA_DEBUG(4, "%s(), hints = %04x\n", __FUNCTION__, hints);
/* Make a new registration */
service = kmalloc(sizeof(irlmp_service_t), GFP_ATOMIC);
if (!service) {
IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __FUNCTION__);
return NULL;
}
service->hints.word = hints;
hashbin_insert(irlmp->services, (irda_queue_t *) service,
(long) service, NULL);
irlmp->hints.word |= hints;
return (void *)service;
}
EXPORT_SYMBOL(irlmp_register_service);
/*
* Function irlmp_unregister_service (handle)
*
* Unregister service with IrLMP.
*
* Returns: 0 on success, -1 on error
*/
int irlmp_unregister_service(void *handle)
{
irlmp_service_t *service;
unsigned long flags;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
if (!handle)
return -1;
/* Caller may call with invalid handle (it's legal) - Jean II */
service = hashbin_lock_find(irlmp->services, (long) handle, NULL);
if (!service) {
IRDA_DEBUG(1, "%s(), Unknown service!\n", __FUNCTION__);
return -1;
}
hashbin_remove_this(irlmp->services, (irda_queue_t *) service);
kfree(service);
/* Remove old hint bits */
irlmp->hints.word = 0;
/* Refresh current hint bits */
spin_lock_irqsave(&irlmp->services->hb_spinlock, flags);
service = (irlmp_service_t *) hashbin_get_first(irlmp->services);
while (service) {
irlmp->hints.word |= service->hints.word;
service = (irlmp_service_t *)hashbin_get_next(irlmp->services);
}
spin_unlock_irqrestore(&irlmp->services->hb_spinlock, flags);
return 0;
}
EXPORT_SYMBOL(irlmp_unregister_service);
/*
* Function irlmp_register_client (hint_mask, callback1, callback2)
*
* Register a local client with IrLMP
* First callback is selective discovery (based on hints)
* Second callback is for selective discovery expiries
*
* Returns: handle > 0 on success, 0 on error
*/
void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
DISCOVERY_CALLBACK2 expir_clb, void *priv)
{
irlmp_client_t *client;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(irlmp != NULL, return NULL;);
/* Make a new registration */
client = kmalloc(sizeof(irlmp_client_t), GFP_ATOMIC);
if (!client) {
IRDA_DEBUG( 1, "%s(), Unable to kmalloc!\n", __FUNCTION__);
return NULL;
}
/* Register the details */
client->hint_mask.word = hint_mask;
client->disco_callback = disco_clb;
client->expir_callback = expir_clb;
client->priv = priv;
hashbin_insert(irlmp->clients, (irda_queue_t *) client,
(long) client, NULL);
return (void *) client;
}
EXPORT_SYMBOL(irlmp_register_client);
/*
* Function irlmp_update_client (handle, hint_mask, callback1, callback2)
*
* Updates specified client (handle) with possibly new hint_mask and
* callback
*
* Returns: 0 on success, -1 on error
*/
int irlmp_update_client(void *handle, __u16 hint_mask,
DISCOVERY_CALLBACK1 disco_clb,
DISCOVERY_CALLBACK2 expir_clb, void *priv)
{
irlmp_client_t *client;
if (!handle)
return -1;
client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
if (!client) {
IRDA_DEBUG(1, "%s(), Unknown client!\n", __FUNCTION__);
return -1;
}
client->hint_mask.word = hint_mask;
client->disco_callback = disco_clb;
client->expir_callback = expir_clb;
client->priv = priv;
return 0;
}
EXPORT_SYMBOL(irlmp_update_client);
/*
* Function irlmp_unregister_client (handle)
*
* Returns: 0 on success, -1 on error
*
*/
int irlmp_unregister_client(void *handle)
{
struct irlmp_client *client;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
if (!handle)
return -1;
/* Caller may call with invalid handle (it's legal) - Jean II */
client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
if (!client) {
IRDA_DEBUG(1, "%s(), Unknown client!\n", __FUNCTION__);
return -1;
}
IRDA_DEBUG(4, "%s(), removing client!\n", __FUNCTION__);
hashbin_remove_this(irlmp->clients, (irda_queue_t *) client);
kfree(client);
return 0;
}
EXPORT_SYMBOL(irlmp_unregister_client);
/*
* Function irlmp_slsap_inuse (slsap)
*
* Check if the given source LSAP selector is in use
*
* This function is clearly not very efficient. On the mitigating side, the
* stack make sure that in 99% of the cases, we are called only once
* for each socket allocation. We could probably keep a bitmap
* of the allocated LSAP, but I'm not sure the complexity is worth it.
* Jean II
*/
static int irlmp_slsap_inuse(__u8 slsap_sel)
{
struct lsap_cb *self;
struct lap_cb *lap;
unsigned long flags;
IRDA_ASSERT(irlmp != NULL, return TRUE;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return TRUE;);
IRDA_ASSERT(slsap_sel != LSAP_ANY, return TRUE;);
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
#ifdef CONFIG_IRDA_ULTRA
/* Accept all bindings to the connectionless LSAP */
if (slsap_sel == LSAP_CONNLESS)
return FALSE;
#endif /* CONFIG_IRDA_ULTRA */
/* Valid values are between 0 and 127 (0x0-0x6F) */
if (slsap_sel > LSAP_MAX)
return TRUE;
/*
* Check if slsap is already in use. To do this we have to loop over
* every IrLAP connection and check every LSAP associated with each
* the connection.
*/
spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags,
SINGLE_DEPTH_NESTING);
lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
while (lap != NULL) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;);
/* Careful for priority inversions here !
* irlmp->links is never taken while another IrDA
* spinlock is held, so we are safe. Jean II */
spin_lock(&lap->lsaps->hb_spinlock);
/* For this IrLAP, check all the LSAPs */
self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
while (self != NULL) {
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
goto errlsap;);
if ((self->slsap_sel == slsap_sel)) {
IRDA_DEBUG(4, "Source LSAP selector=%02x in use\n",
self->slsap_sel);
goto errlsap;
}
self = (struct lsap_cb*) hashbin_get_next(lap->lsaps);
}
spin_unlock(&lap->lsaps->hb_spinlock);
/* Next LAP */
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
/*
* Server sockets are typically waiting for connections and
* therefore reside in the unconnected list. We don't want
* to give out their LSAPs for obvious reasons...
* Jean II
*/
spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
self = (struct lsap_cb *) hashbin_get_first(irlmp->unconnected_lsaps);
while (self != NULL) {
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, goto erruncon;);
if ((self->slsap_sel == slsap_sel)) {
IRDA_DEBUG(4, "Source LSAP selector=%02x in use (unconnected)\n",
self->slsap_sel);
goto erruncon;
}
self = (struct lsap_cb*) hashbin_get_next(irlmp->unconnected_lsaps);
}
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
return FALSE;
/* Error exit from within one of the two nested loops.
* Make sure we release the right spinlock in the righ order.
* Jean II */
errlsap:
spin_unlock(&lap->lsaps->hb_spinlock);
IRDA_ASSERT_LABEL(errlap:)
spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
return TRUE;
/* Error exit from within the unconnected loop.
* Just one spinlock to release... Jean II */
erruncon:
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
return TRUE;
}
/*
* 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
*/
static __u8 irlmp_find_free_slsap(void)
{
__u8 lsap_sel;
int wrapped = 0;
IRDA_ASSERT(irlmp != NULL, return -1;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return -1;);
/* Most users don't really care which LSAPs they are given,
* and therefore we automatically give them a free LSAP.
* This function try to find a suitable LSAP, i.e. which is
* not in use and is within the acceptable range. Jean II */
do {
/* Always increment to LSAP number before using it.
* In theory, we could reuse the last LSAP number, as long
* as it is no longer in use. Some IrDA stack do that.
* However, the previous socket may be half closed, i.e.
* we closed it, we think it's no longer in use, but the
* other side did not receive our close and think it's
* active and still send data on it.
* This is similar to what is done with PIDs and TCP ports.
* Also, this reduce the number of calls to irlmp_slsap_inuse()
* which is an expensive function to call.
* Jean II */
irlmp->last_lsap_sel++;
/* Check if we need to wraparound (0x70-0x7f are reserved) */
if (irlmp->last_lsap_sel > LSAP_MAX) {
/* 0x00-0x10 are also reserved for well know ports */
irlmp->last_lsap_sel = 0x10;
/* Make sure we terminate the loop */
if (wrapped++) {
IRDA_ERROR("%s: no more free LSAPs !\n",
__FUNCTION__);
return 0;
}
}
/* If the LSAP is in use, try the next one.
* Despite the autoincrement, we need to check if the lsap
* is really in use or not, first because LSAP may be
* directly allocated in irlmp_open_lsap(), and also because
* we may wraparound on old sockets. Jean II */
} while (irlmp_slsap_inuse(irlmp->last_lsap_sel));
/* Got it ! */
lsap_sel = irlmp->last_lsap_sel;
IRDA_DEBUG(4, "%s(), found free lsap_sel=%02x\n",
__FUNCTION__, 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 */
IRDA_DEBUG( 1, "%s(), LAP_DISC_INDICATION\n", __FUNCTION__);
reason = LM_USER_REQUEST;
break;
case LAP_NO_RESPONSE: /* To many retransmits without response */
IRDA_DEBUG( 1, "%s(), LAP_NO_RESPONSE\n", __FUNCTION__);
reason = LM_LAP_DISCONNECT;
break;
case LAP_RESET_INDICATION:
IRDA_DEBUG( 1, "%s(), LAP_RESET_INDICATION\n", __FUNCTION__);
reason = LM_LAP_RESET;
break;
case LAP_FOUND_NONE:
case LAP_MEDIA_BUSY:
case LAP_PRIMARY_CONFLICT:
IRDA_DEBUG(1, "%s(), LAP_FOUND_NONE, LAP_MEDIA_BUSY or LAP_PRIMARY_CONFLICT\n", __FUNCTION__);
reason = LM_CONNECT_FAILURE;
break;
default:
IRDA_DEBUG(1, "%s(), Unknow IrLAP disconnect reason %d!\n",
__FUNCTION__, lap_reason);
reason = LM_LAP_DISCONNECT;
break;
}
return reason;
}
#ifdef CONFIG_PROC_FS
struct irlmp_iter_state {
hashbin_t *hashbin;
};
#define LSAP_START_TOKEN ((void *)1)
#define LINK_START_TOKEN ((void *)2)
static void *irlmp_seq_hb_idx(struct irlmp_iter_state *iter, loff_t *off)
{
void *element;
spin_lock_irq(&iter->hashbin->hb_spinlock);
for (element = hashbin_get_first(iter->hashbin);
element != NULL;
element = hashbin_get_next(iter->hashbin)) {
if (!off || *off-- == 0) {
/* NB: hashbin left locked */
return element;
}
}
spin_unlock_irq(&iter->hashbin->hb_spinlock);
iter->hashbin = NULL;
return NULL;
}
static void *irlmp_seq_start(struct seq_file *seq, loff_t *pos)
{
struct irlmp_iter_state *iter = seq->private;
void *v;
loff_t off = *pos;
iter->hashbin = NULL;
if (off-- == 0)
return LSAP_START_TOKEN;
iter->hashbin = irlmp->unconnected_lsaps;
v = irlmp_seq_hb_idx(iter, &off);
if (v)
return v;
if (off-- == 0)
return LINK_START_TOKEN;
iter->hashbin = irlmp->links;
return irlmp_seq_hb_idx(iter, &off);
}
static void *irlmp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct irlmp_iter_state *iter = seq->private;
++*pos;
if (v == LSAP_START_TOKEN) { /* start of list of lsaps */
iter->hashbin = irlmp->unconnected_lsaps;
v = irlmp_seq_hb_idx(iter, NULL);
return v ? v : LINK_START_TOKEN;
}
if (v == LINK_START_TOKEN) { /* start of list of links */
iter->hashbin = irlmp->links;
return irlmp_seq_hb_idx(iter, NULL);
}
v = hashbin_get_next(iter->hashbin);
if (v == NULL) { /* no more in this hash bin */
spin_unlock_irq(&iter->hashbin->hb_spinlock);
if (iter->hashbin == irlmp->unconnected_lsaps)
v = LINK_START_TOKEN;
iter->hashbin = NULL;
}
return v;
}
static void irlmp_seq_stop(struct seq_file *seq, void *v)
{
struct irlmp_iter_state *iter = seq->private;
if (iter->hashbin)
spin_unlock_irq(&iter->hashbin->hb_spinlock);
}
static int irlmp_seq_show(struct seq_file *seq, void *v)
{
const struct irlmp_iter_state *iter = seq->private;
struct lsap_cb *self = v;
if (v == LSAP_START_TOKEN)
seq_puts(seq, "Unconnected LSAPs:\n");
else if (v == LINK_START_TOKEN)
seq_puts(seq, "\nRegistered Link Layers:\n");
else if (iter->hashbin == irlmp->unconnected_lsaps) {
self = v;
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EINVAL; );
seq_printf(seq, "lsap state: %s, ",
irlsap_state[ self->lsap_state]);
seq_printf(seq,
"slsap_sel: %#02x, dlsap_sel: %#02x, ",
self->slsap_sel, self->dlsap_sel);
seq_printf(seq, "(%s)", self->notify.name);
seq_printf(seq, "\n");
} else if (iter->hashbin == irlmp->links) {
struct lap_cb *lap = v;
seq_printf(seq, "lap state: %s, ",
irlmp_state[lap->lap_state]);
seq_printf(seq, "saddr: %#08x, daddr: %#08x, ",
lap->saddr, lap->daddr);
seq_printf(seq, "num lsaps: %d",
HASHBIN_GET_SIZE(lap->lsaps));
seq_printf(seq, "\n");
/* Careful for priority inversions here !
* All other uses of attrib spinlock are independent of
* the object spinlock, so we are safe. Jean II */
spin_lock(&lap->lsaps->hb_spinlock);
seq_printf(seq, "\n Connected LSAPs:\n");
for (self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
self != NULL;
self = (struct lsap_cb *)hashbin_get_next(lap->lsaps)) {
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
goto outloop;);
seq_printf(seq, " lsap state: %s, ",
irlsap_state[ self->lsap_state]);
seq_printf(seq,
"slsap_sel: %#02x, dlsap_sel: %#02x, ",
self->slsap_sel, self->dlsap_sel);
seq_printf(seq, "(%s)", self->notify.name);
seq_putc(seq, '\n');
}
IRDA_ASSERT_LABEL(outloop:)
spin_unlock(&lap->lsaps->hb_spinlock);
seq_putc(seq, '\n');
} else
return -EINVAL;
return 0;
}
static struct seq_operations irlmp_seq_ops = {
.start = irlmp_seq_start,
.next = irlmp_seq_next,
.stop = irlmp_seq_stop,
.show = irlmp_seq_show,
};
static int irlmp_seq_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
int rc = -ENOMEM;
struct irlmp_iter_state *s;
IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
goto out;
rc = seq_open(file, &irlmp_seq_ops);
if (rc)
goto out_kfree;
seq = file->private_data;
seq->private = s;
out:
return rc;
out_kfree:
kfree(s);
goto out;
}
const struct file_operations irlmp_seq_fops = {
.owner = THIS_MODULE,
.open = irlmp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
#endif /* PROC_FS */
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