ircomm_core.c

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/*********************************************************************
 *                
 * Filename:      ircomm_core.c
 * Version:       1.0
 * Description:   IrCOMM service interface
 * Status:        Experimental.
 * Author:        Dag Brattli <[e-mail]>
 * Created at:    Sun Jun  6 20:37:34 1999
 * Modified at:   Tue Dec 21 13:26:41 1999
 * Modified by:   Dag Brattli <[e-mail]>
 * 
 *     Copyright (c) 1999 Dag Brattli, 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.
 * 
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License 
 *     along with this program; if not, write to the Free Software 
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *     MA 02111-1307 USA
 *     
 ********************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irttp.h>
#include <net/irda/irias_object.h>

#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_lmp.h>
#include <net/irda/ircomm_ttp.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_core.h>

static int __ircomm_close(struct ircomm_cb *self);
static void ircomm_control_indication(struct ircomm_cb *self, 
				      struct sk_buff *skb, int clen);

#ifdef CONFIG_PROC_FS
static int ircomm_proc_read(char *buf, char **start, off_t offset, int len);

extern struct proc_dir_entry *proc_irda;
#endif /* CONFIG_PROC_FS */

hashbin_t *ircomm = NULL;

int __init ircomm_init(void)
{
	ircomm = hashbin_new(HB_LOCAL); 
	if (ircomm == NULL) {
		ERROR(__FUNCTION__ "(), can't allocate hashbin!\n");
		return -ENOMEM;
	}
	
#ifdef CONFIG_PROC_FS
	create_proc_info_entry("ircomm", 0, proc_irda, ircomm_proc_read);
#endif /* CONFIG_PROC_FS */
	
	MESSAGE("IrCOMM protocol (Dag Brattli)\n");
		
	return 0;
}

#ifdef MODULE
void ircomm_cleanup(void)
{
	IRDA_DEBUG(2, __FUNCTION__ "()\n");

	hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);

#ifdef CONFIG_PROC_FS
	remove_proc_entry("ircomm", proc_irda);
#endif /* CONFIG_PROC_FS */
}
#endif /* MODULE */

/*
 * Function ircomm_open (client_notify)
 *
 *    Start a new IrCOMM instance
 *
 */
struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
{
	struct ircomm_cb *self = NULL;
	int ret;

	IRDA_DEBUG(2, __FUNCTION__ "(), service_type=0x%02x\n",
		   service_type);

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

	self = kmalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
	if (self == NULL)
		return NULL;

	memset(self, 0, sizeof(struct ircomm_cb));

	self->notify = *notify;
	self->magic = IRCOMM_MAGIC;

	/* Check if we should use IrLMP or IrTTP */
	if (service_type & IRCOMM_3_WIRE_RAW) {
		self->flow_status = FLOW_START;
		ret = ircomm_open_lsap(self);
	} else
		ret = ircomm_open_tsap(self);

	if (ret < 0)
		return NULL;

	self->service_type = service_type;
	self->line = line;

	hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);

	ircomm_next_state(self, IRCOMM_IDLE);	

	return self;
}

/*
 * Function ircomm_close_instance (self)
 *
 *    Remove IrCOMM instance
 *
 */
static int __ircomm_close(struct ircomm_cb *self)
{
	IRDA_DEBUG(2, __FUNCTION__"()\n");

	/* Disconnect link if any */
	ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);

	/* Remove TSAP */
	if (self->tsap) {
		irttp_close_tsap(self->tsap);
		self->tsap = NULL;
	}

	/* Remove LSAP */
	if (self->lsap) {
		irlmp_close_lsap(self->lsap);
		self->lsap = NULL;
	}
	self->magic = 0;

	kfree(self);

	return 0;
}

/*
 * Function ircomm_close (self)
 *
 *    Closes and removes the specified IrCOMM instance
 *
 */
int ircomm_close(struct ircomm_cb *self)
{
	struct ircomm_cb *entry;

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

	IRDA_DEBUG(0, __FUNCTION__ "()\n");

	entry = hashbin_remove(ircomm, self->line, NULL);

	ASSERT(entry == self, return -1;);
	
        return __ircomm_close(self);
}

/*
 * Function ircomm_connect_request (self, service_type)
 *
 *    Impl. of this function is differ from one of the reference. This
 *    function does discovery as well as sending connect request
 * 
 */
int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel, 
			   __u32 saddr, __u32 daddr, struct sk_buff *skb,
			   __u8 service_type)
{
	struct ircomm_info info;
	int ret;

	IRDA_DEBUG(2 , __FUNCTION__"()\n");

	ASSERT(self != NULL, return -1;);
	ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

	self->service_type= service_type;

	info.dlsap_sel = dlsap_sel;
	info.saddr = saddr;
	info.daddr = daddr;

	ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);

	return ret;
}

/*
 * Function ircomm_connect_indication (self, qos, skb)
 *
 *    Notify user layer about the incomming connection
 *
 */
void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
			       struct ircomm_info *info)
{
	int clen = 0;
	
	IRDA_DEBUG(2, __FUNCTION__ "()\n");

	/* Check if the packet contains data on the control channel */
	if (skb->len > 0)
		clen = skb->data[0];
	
	/* 
	 * If there are any data hiding in the control channel, we must 
	 * deliver it first. The side effect is that the control channel 
	 * will be removed from the skb
	 */
	if (self->notify.connect_indication)
		self->notify.connect_indication(self->notify.instance, self, 
						info->qos, info->max_data_size,
						info->max_header_size, skb);
	else {
		IRDA_DEBUG(0, __FUNCTION__ "(), missing handler\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_connect_response (self, userdata, max_sdu_size)
 *
 *    User accepts connection
 *
 */
int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
{
	int ret;

	ASSERT(self != NULL, return -1;);
	ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

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

	ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);

	return ret;
}	

/*
 * Function connect_confirm (self, skb)
 *
 *    Notify user layer that the link is now connected
 *
 */
void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
			    struct ircomm_info *info)
{
	IRDA_DEBUG(4, __FUNCTION__"()\n");

	if (self->notify.connect_confirm )
		self->notify.connect_confirm(self->notify.instance,
					     self, info->qos, 
					     info->max_data_size,
					     info->max_header_size, skb);
	else {
		IRDA_DEBUG(0, __FUNCTION__ "(), missing handler\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_data_request (self, userdata)
 *
 *    Send IrCOMM data to peer device
 *
 */
int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
{
	int ret;

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

	ASSERT(self != NULL, return -EFAULT;);
	ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
	ASSERT(skb != NULL, return -EFAULT;);
	
	ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);

	return ret;
}

/*
 * Function ircomm_data_indication (self, skb)
 *
 *    Data arrived, so deliver it to user
 *
 */
void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
{	
	IRDA_DEBUG(4, __FUNCTION__"()\n");

	ASSERT(skb->len > 0, return;);

	if (self->notify.data_indication)
		self->notify.data_indication(self->notify.instance, self, skb);
	else {
		IRDA_DEBUG(0, __FUNCTION__ "(), missing handler\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_process_data (self, skb)
 *
 *    Data arrived which may contain control channel data
 *
 */
void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
{
	int clen;

	ASSERT(skb->len > 0, return;);

	clen = skb->data[0];

	/* 
	 * If there are any data hiding in the control channel, we must 
	 * deliver it first. The side effect is that the control channel 
	 * will be removed from the skb
	 */
	if (clen > 0)
		ircomm_control_indication(self, skb, clen);

	/* Remove control channel from data channel */
	skb_pull(skb, clen+1);

	if (skb->len)
		ircomm_data_indication(self, skb);		
	else {
		IRDA_DEBUG(4, __FUNCTION__ 
			   "(), data was control info only!\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_control_request (self, params)
 *
 *    Send control data to peer device
 *
 */
int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
{
	int ret;
	
	IRDA_DEBUG(2, __FUNCTION__"()\n");

	ASSERT(self != NULL, return -EFAULT;);
	ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
	ASSERT(skb != NULL, return -EFAULT;);
	
	ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);

	return ret;
}

/*
 * Function ircomm_control_indication (self, skb)
 *
 *    Data has arrived on the control channel
 *
 */
static void ircomm_control_indication(struct ircomm_cb *self, 
				      struct sk_buff *skb, int clen)
{
	struct sk_buff *ctrl_skb;

	IRDA_DEBUG(2, __FUNCTION__"()\n");	

	ctrl_skb = skb_clone(skb, GFP_ATOMIC);
	if (!ctrl_skb)
		return;

	/* Remove data channel from control channel */
	skb_trim(ctrl_skb, clen+1);
	
	/* Use udata for delivering data on the control channel */
	if (self->notify.udata_indication)
		self->notify.udata_indication(self->notify.instance, self, 
					      ctrl_skb);
	else {
		IRDA_DEBUG(0, __FUNCTION__ "(), missing handler\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_disconnect_request (self, userdata, priority)
 *
 *    User layer wants to disconnect the IrCOMM connection
 *
 */
int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
{
	struct ircomm_info info;
	int ret;

	IRDA_DEBUG(2, __FUNCTION__"()\n");

	ASSERT(self != NULL, return -1;);
	ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

	ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata, 
			      &info);
	return ret;
}

/*
 * Function disconnect_indication (self, skb)
 *
 *    Tell user that the link has been disconnected
 *
 */
void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
				  struct ircomm_info *info)
{
	IRDA_DEBUG(2, __FUNCTION__ "()\n");
       
	ASSERT(info != NULL, return;);

	if (self->notify.disconnect_indication) {
		self->notify.disconnect_indication(self->notify.instance, self,
						   info->reason, skb);
	} else {
		IRDA_DEBUG(0, __FUNCTION__ "(), missing handler\n");
		dev_kfree_skb(skb);
	}
}

/*
 * Function ircomm_flow_request (self, flow)
 *
 *    
 *
 */
void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
{
	IRDA_DEBUG(2, __FUNCTION__ "()\n");

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

	if (self->service_type == IRCOMM_3_WIRE_RAW)
		return;

	irttp_flow_request(self->tsap, flow);
}

#ifdef CONFIG_PROC_FS
/*
 * Function ircomm_proc_read (buf, start, offset, len, unused)
 *
 *    
 *
 */
int ircomm_proc_read(char *buf, char **start, off_t offset, int len)
{ 	
	struct ircomm_cb *self;
	unsigned long flags;
	int i=0;
	
	save_flags(flags);
	cli();

	len = 0;

	len += sprintf(buf+len, "Instance %d:\n", i++);

	self = (struct ircomm_cb *) hashbin_get_first(ircomm);
	while (self != NULL) {
		ASSERT(self->magic == IRCOMM_MAGIC, return len;);

		self = (struct ircomm_cb *) hashbin_get_next(ircomm);
 	} 
	restore_flags(flags);

	return len;
}
#endif /* CONFIG_PROC_FS */

#ifdef MODULE
MODULE_AUTHOR("Dag Brattli <[e-mail]>");
MODULE_DESCRIPTION("IrCOMM protocol");

int init_module(void) 
{
	return ircomm_init();
}
	
void cleanup_module(void)
{
	ircomm_cleanup();
}
#endif /* MODULE */