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/*********************************************************************
*
* Filename: irttp.c
* Version: 1.2
* Description: Tiny Transport Protocol (TTP) implementation
* Status: Stable
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Aug 31 20:14:31 1997
* Modified at: Wed Jan 5 11:31:27 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
* Copyright (c) 2000-2001 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 Tromsų 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/skbuff.h>
#include <linux/init.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/irlap.h>
#include <net/irda/irlmp.h>
#include <net/irda/parameters.h>
#include <net/irda/irttp.h>
static struct irttp_cb *irttp = NULL;
static void __irttp_close_tsap(struct tsap_cb *self);
static int irttp_data_indication(void *instance, void *sap,
struct sk_buff *skb);
static int irttp_udata_indication(void *instance, void *sap,
struct sk_buff *skb);
static void irttp_disconnect_indication(void *instance, void *sap,
LM_REASON reason, struct sk_buff *);
static void irttp_connect_indication(void *instance, void *sap,
struct qos_info *qos, __u32 max_sdu_size,
__u8 header_size, struct sk_buff *skb);
static void irttp_connect_confirm(void *instance, void *sap,
struct qos_info *qos, __u32 max_sdu_size,
__u8 header_size, struct sk_buff *skb);
static void irttp_run_tx_queue(struct tsap_cb *self);
static void irttp_run_rx_queue(struct tsap_cb *self);
static void irttp_flush_queues(struct tsap_cb *self);
static void irttp_fragment_skb(struct tsap_cb *self, struct sk_buff *skb);
static void irttp_start_todo_timer(struct tsap_cb *self, int timeout);
static struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self);
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param,
int get);
/* Information for parsing parameters in IrTTP */
static pi_minor_info_t pi_minor_call_table[] = {
{ NULL, 0 }, /* 0x00 */
{ irttp_param_max_sdu_size, PV_INTEGER | PV_BIG_ENDIAN } /* 0x01 */
};
static pi_major_info_t pi_major_call_table[] = {{ pi_minor_call_table, 2 }};
static pi_param_info_t param_info = { pi_major_call_table, 1, 0x0f, 4 };
/*
* Function irttp_init (void)
*
* Initialize the IrTTP layer. Called by module initialization code
*
*/
int __init irttp_init(void)
{
/* Initialize the irttp structure. */
if (irttp == NULL) {
irttp = kmalloc(sizeof(struct irttp_cb), GFP_KERNEL);
if (irttp == NULL)
return -ENOMEM;
}
memset(irttp, 0, sizeof(struct irttp_cb));
irttp->magic = TTP_MAGIC;
irttp->tsaps = hashbin_new(HB_LOCAL);
if (!irttp->tsaps) {
ERROR(__FUNCTION__ "(), can't allocate IrTTP hashbin!\n");
return -ENOMEM;
}
return 0;
}
/*
* Function irttp_cleanup (void)
*
* Called by module destruction/cleanup code
*
*/
#ifdef MODULE
void irttp_cleanup(void)
{
/* Check for main structure */
ASSERT(irttp != NULL, return;);
ASSERT(irttp->magic == TTP_MAGIC, return;);
/*
* Delete hashbin and close all TSAP instances in it
*/
hashbin_delete(irttp->tsaps, (FREE_FUNC) __irttp_close_tsap);
irttp->magic = 0;
/* De-allocate main structure */
kfree(irttp);
irttp = NULL;
}
#endif
/*
* Function irttp_open_tsap (stsap, notify)
*
* Create TSAP connection endpoint,
*/
struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit, notify_t *notify)
{
struct tsap_cb *self;
struct lsap_cb *lsap;
notify_t ttp_notify;
ASSERT(irttp != NULL, return NULL;);
ASSERT(irttp->magic == TTP_MAGIC, return NULL;);
/* The IrLMP spec (IrLMP 1.1 p10) says that we have the right to
* use only 0x01-0x6F. Of course, we can use LSAP_ANY as well.
* JeanII */
if((stsap_sel != LSAP_ANY) &&
((stsap_sel < 0x01) || (stsap_sel >= 0x70))) {
IRDA_DEBUG(0, __FUNCTION__ "(), invalid tsap!\n");
return NULL;
}
self = kmalloc(sizeof(struct tsap_cb), GFP_ATOMIC);
if (self == NULL) {
IRDA_DEBUG(0, __FUNCTION__ "(), unable to kmalloc!\n");
return NULL;
}
memset(self, 0, sizeof(struct tsap_cb));
spin_lock_init(&self->lock);
init_timer(&self->todo_timer);
/* Initialize callbacks for IrLMP to use */
irda_notify_init(&ttp_notify);
ttp_notify.connect_confirm = irttp_connect_confirm;
ttp_notify.connect_indication = irttp_connect_indication;
ttp_notify.disconnect_indication = irttp_disconnect_indication;
ttp_notify.data_indication = irttp_data_indication;
ttp_notify.udata_indication = irttp_udata_indication;
if(notify->status_indication != NULL)
ttp_notify.status_indication = irttp_status_indication;
ttp_notify.instance = self;
strncpy(ttp_notify.name, notify->name, NOTIFY_MAX_NAME);
self->magic = TTP_TSAP_MAGIC;
self->connected = FALSE;
skb_queue_head_init(&self->rx_queue);
skb_queue_head_init(&self->tx_queue);
skb_queue_head_init(&self->rx_fragments);
/*
* Create LSAP at IrLMP layer
*/
lsap = irlmp_open_lsap(stsap_sel, &ttp_notify, 0);
if (lsap == NULL) {
WARNING(__FUNCTION__ "(), unable to allocate LSAP!!\n");
return NULL;
}
/*
* If user specified LSAP_ANY as source TSAP selector, then IrLMP
* will replace it with whatever source selector which is free, so
* the stsap_sel we have might not be valid anymore
*/
self->stsap_sel = lsap->slsap_sel;
IRDA_DEBUG(4, __FUNCTION__ "(), stsap_sel=%02x\n", self->stsap_sel);
self->notify = *notify;
self->lsap = lsap;
hashbin_insert(irttp->tsaps, (irda_queue_t *) self, (int) self, NULL);
if (credit > TTP_MAX_QUEUE)
self->initial_credit = TTP_MAX_QUEUE;
else
self->initial_credit = credit;
return self;
}
/*
* Function irttp_close (handle)
*
* Remove an instance of a TSAP. This function should only deal with the
* deallocation of the TSAP, and resetting of the TSAPs values;
*
*/
static void __irttp_close_tsap(struct tsap_cb *self)
{
/* First make sure we're connected. */
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
irttp_flush_queues(self);
del_timer(&self->todo_timer);
/* This one won't be cleaned up if we are diconnect_pend + close_pend
* and we receive a disconnect_indication */
if (self->disconnect_skb)
dev_kfree_skb(self->disconnect_skb);
self->connected = FALSE;
self->magic = ~TTP_TSAP_MAGIC;
kfree(self);
}
/*
* Function irttp_close (self)
*
* Remove TSAP from list of all TSAPs and then deallocate all resources
* associated with this TSAP
*
* Note : because we *free* the tsap structure, it is the responsability
* of the caller to make sure we are called only once and to deal with
* possible race conditions. - Jean II
*/
int irttp_close_tsap(struct tsap_cb *self)
{
struct tsap_cb *tsap;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
/* Make sure tsap has been disconnected */
if (self->connected) {
/* Check if disconnect is not pending */
if (!test_bit(0, &self->disconnect_pend)) {
WARNING(__FUNCTION__ "(), TSAP still connected!\n");
irttp_disconnect_request(self, NULL, P_NORMAL);
}
self->close_pend = TRUE;
irttp_start_todo_timer(self, 1*HZ);
return 0; /* Will be back! */
}
tsap = hashbin_remove(irttp->tsaps, (int) self, NULL);
ASSERT(tsap == self, return -1;);
/* Close corresponding LSAP */
if (self->lsap) {
irlmp_close_lsap(self->lsap);
self->lsap = NULL;
}
__irttp_close_tsap(self);
return 0;
}
/*
* Function irttp_udata_request (self, skb)
*
* Send unreliable data on this TSAP
*
*/
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
{
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(4, __FUNCTION__ "()\n");
/* Check that nothing bad happens */
if ((skb->len == 0) || (!self->connected)) {
IRDA_DEBUG(1, __FUNCTION__ "(), No data, or not connected\n");
return -1;
}
if (skb->len > self->max_seg_size) {
IRDA_DEBUG(1, __FUNCTION__ "(), UData is to large for IrLAP!\n");
return -1;
}
irlmp_udata_request(self->lsap, skb);
self->stats.tx_packets++;
return 0;
}
/*
* Function irttp_data_request (handle, skb)
*
* Queue frame for transmission. If SAR is enabled, fragement the frame
* and queue the fragments for transmission
*/
int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb)
{
__u8 *frame;
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
ASSERT(skb != NULL, return -1;);
/* Check that nothing bad happens */
if ((skb->len == 0) || (!self->connected)) {
WARNING(__FUNCTION__ "(), No data, or not connected\n");
return -ENOTCONN;
}
/*
* Check if SAR is disabled, and the frame is larger than what fits
* inside an IrLAP frame
*/
if ((self->tx_max_sdu_size == 0) && (skb->len > self->max_seg_size)) {
ERROR(__FUNCTION__
"(), SAR disabled, and data is to large for IrLAP!\n");
return -EMSGSIZE;
}
/*
* Check if SAR is enabled, and the frame is larger than the
* TxMaxSduSize
*/
if ((self->tx_max_sdu_size != 0) &&
(self->tx_max_sdu_size != TTP_SAR_UNBOUND) &&
(skb->len > self->tx_max_sdu_size))
{
ERROR(__FUNCTION__ "(), SAR enabled, "
"but data is larger than TxMaxSduSize!\n");
return -EMSGSIZE;
}
/*
* Check if transmit queue is full
*/
if (skb_queue_len(&self->tx_queue) >= TTP_MAX_QUEUE) {
/*
* Give it a chance to empty itself
*/
irttp_run_tx_queue(self);
return -ENOBUFS;
}
/* Queue frame, or queue frame segments */
if ((self->tx_max_sdu_size == 0) || (skb->len < self->max_seg_size)) {
/* Queue frame */
ASSERT(skb_headroom(skb) >= TTP_HEADER, return -1;);
frame = skb_push(skb, TTP_HEADER);
frame[0] = 0x00; /* Clear more bit */
skb_queue_tail(&self->tx_queue, skb);
} else {
/*
* Fragment the frame, this function will also queue the
* fragments, we don't care about the fact the transmit
* queue may be overfilled by all the segments for a little
* while
*/
irttp_fragment_skb(self, skb);
}
/* Check if we can accept more data from client */
if ((!self->tx_sdu_busy) &&
(skb_queue_len(&self->tx_queue) > TTP_HIGH_THRESHOLD)) {
/* Tx queue filling up, so stop client */
self->tx_sdu_busy = TRUE;
if (self->notify.flow_indication) {
self->notify.flow_indication(self->notify.instance,
self, FLOW_STOP);
}
}
/* Try to make some progress */
irttp_run_tx_queue(self);
return 0;
}
/*
* Function irttp_run_tx_queue (self)
*
* Transmit packets queued for transmission (if possible)
*
*/
static void irttp_run_tx_queue(struct tsap_cb *self)
{
struct sk_buff *skb;
unsigned long flags;
int n;
/* Get exclusive access to the tx queue, otherwise don't touch it */
if (irda_lock(&self->tx_queue_lock) == FALSE)
return;
/* Try to send out frames as long as we have credits */
while ((self->send_credit > 0) &&
(skb = skb_dequeue(&self->tx_queue)))
{
/*
* Make sure we don't flood IrLAP with frames just because
* the remote device has given us a lot of credits
*/
if (irlmp_get_lap_tx_queue_len(self->lsap) > LAP_MAX_QUEUE) {
/* Re-queue packet */
skb_queue_head(&self->tx_queue, skb);
/* Try later. Would be better if IrLAP could notify us */
irttp_start_todo_timer(self, MSECS_TO_JIFFIES(10));
break;
}
/*
* Since we can transmit and receive frames concurrently,
* the code below is a critical region and we must assure that
* nobody messes with the credits while we update them.
*/
spin_lock_irqsave(&self->lock, flags);
n = self->avail_credit;
self->avail_credit = 0;
/* Only room for 127 credits in frame */
if (n > 127) {
self->avail_credit = n-127;
n = 127;
}
self->remote_credit += n;
self->send_credit--;
spin_unlock_irqrestore(&self->lock, flags);
/*
* More bit must be set by the data_request() or fragment()
* functions
*/
skb->data[0] |= (n & 0x7f);
/* Detach from socket.
* The current skb has a reference to the socket that sent
* it (skb->sk). When we pass it to IrLMP, the skb will be
* stored in in IrLAP (self->wx_list). When we are within
* IrLAP, we loose the notion of socket, so we should not
* have a reference to a socket. So, we drop it here.
*
* Why does it matter ?
* When the skb is freed (kfree_skb), if it is associated
* with a socket, it release buffer space on the socket
* (through sock_wfree() and sock_def_write_space()).
* If the socket no longer exist, we may crash. Hard.
* When we close a socket, we make sure that associated packets
* in IrTTP are freed. However, we have no way to cancel
* the packet that we have passed to IrLAP. So, if a packet
* remains in IrLAP (retry on the link or else) after we
* close the socket, we are dead !
* Jean II */
if (skb->sk != NULL) {
/* IrSOCK application, IrOBEX, ... */
IRDA_DEBUG(4, __FUNCTION__ "() : Detaching SKB from socket.\n");
/* That's the right way to do it - Jean II */
skb_orphan(skb);
} else {
/* IrCOMM over IrTTP, IrLAN, ... */
IRDA_DEBUG(4, __FUNCTION__ "() : Got SKB not attached to a socket.\n");
}
/* Pass the skb to IrLMP - done */
irlmp_data_request(self->lsap, skb);
self->stats.tx_packets++;
/* Check if we can accept more frames from client */
if ((self->tx_sdu_busy) &&
(skb_queue_len(&self->tx_queue) < TTP_LOW_THRESHOLD))
{
self->tx_sdu_busy = FALSE;
if (self->notify.flow_indication)
self->notify.flow_indication(
self->notify.instance, self,
FLOW_START);
}
}
/* Reset lock */
self->tx_queue_lock = 0;
}
/*
* Function irttp_give_credit (self)
*
* Send a dataless flowdata TTP-PDU and give available credit to peer
* TSAP
*/
void irttp_give_credit(struct tsap_cb *self)
{
struct sk_buff *tx_skb = NULL;
unsigned long flags;
int n;
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_DEBUG(4, __FUNCTION__ "() send=%d,avail=%d,remote=%d\n",
self->send_credit, self->avail_credit, self->remote_credit);
/* Give credit to peer */
tx_skb = dev_alloc_skb(64);
if (!tx_skb)
return;
/* Reserve space for LMP, and LAP header */
skb_reserve(tx_skb, self->max_header_size);
/*
* Since we can transmit and receive frames concurrently,
* the code below is a critical region and we must assure that
* nobody messes with the credits while we update them.
*/
spin_lock_irqsave(&self->lock, flags);
n = self->avail_credit;
self->avail_credit = 0;
/* Only space for 127 credits in frame */
if (n > 127) {
self->avail_credit = n - 127;
n = 127;
}
self->remote_credit += n;
spin_unlock_irqrestore(&self->lock, flags);
skb_put(tx_skb, 1);
tx_skb->data[0] = (__u8) (n & 0x7f);
irlmp_data_request(self->lsap, tx_skb);
self->stats.tx_packets++;
}
/*
* Function irttp_udata_indication (instance, sap, skb)
*
* Received some unit-data (unreliable)
*
*/
static int irttp_udata_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct tsap_cb *self;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
ASSERT(skb != NULL, return -1;);
/* Just pass data to layer above */
if (self->notify.udata_indication)
self->notify.udata_indication(self->notify.instance, self,skb);
else
dev_kfree_skb(skb);
self->stats.rx_packets++;
return 0;
}
/*
* Function irttp_data_indication (instance, sap, skb)
*
* Receive segment from IrLMP.
*
*/
static int irttp_data_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct tsap_cb *self;
int n;
self = (struct tsap_cb *) instance;
n = skb->data[0] & 0x7f; /* Extract the credits */
self->stats.rx_packets++;
/*
* Data or dataless packet? Dataless frames contains only the
* TTP_HEADER.
*/
if (skb->len > 1) {
/* Deal with inbound credit */
self->send_credit += n;
self->remote_credit--;
/*
* We don't remove the TTP header, since we must preserve the
* more bit, so the defragment routing knows what to do
*/
skb_queue_tail(&self->rx_queue, skb);
} else {
self->send_credit += n; /* Dataless flowdata TTP-PDU */
dev_kfree_skb(skb);
}
irttp_run_rx_queue(self);
/*
* Give avay some credits to peer?
*/
if ((skb_queue_empty(&self->tx_queue)) &&
(self->remote_credit < TTP_LOW_THRESHOLD) &&
(self->avail_credit > 0))
{
/* Schedule to start immediately after this thread */
irttp_start_todo_timer(self, 0);
/*irttp_give_credit(self);*/
}
/*
* If the peer device has given us some credits and we didn't have
* anyone from before, the we need to shedule the tx queue?
*/
if (self->send_credit == n) {
/*irttp_run_tx_queue(self);*/
irttp_start_todo_timer(self, 0);
}
return 0;
}
/*
* Function irttp_status_indication (self, reason)
*
* Status_indication, just pass to the higher layer...
*
*/
void irttp_status_indication(void *instance,
LINK_STATUS link, LOCK_STATUS lock)
{
struct tsap_cb *self;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
/*
* Inform service user if he has requested it
*/
if (self->notify.status_indication != NULL)
self->notify.status_indication(self->notify.instance,
link, lock);
else
IRDA_DEBUG(2, __FUNCTION__ "(), no handler\n");
}
/*
* Function irttp_flow_request (self, command)
*
* This funtion could be used by the upper layers to tell IrTTP to stop
* delivering frames if the receive queues are starting to get full, or
* to tell IrTTP to start delivering frames again.
*/
void irttp_flow_request(struct tsap_cb *self, LOCAL_FLOW flow)
{
IRDA_DEBUG(1, __FUNCTION__ "()\n");
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
switch (flow) {
case FLOW_STOP:
IRDA_DEBUG(1, __FUNCTION__ "(), flow stop\n");
self->rx_sdu_busy = TRUE;
break;
case FLOW_START:
IRDA_DEBUG(1, __FUNCTION__ "(), flow start\n");
self->rx_sdu_busy = FALSE;
irttp_run_rx_queue(self);
break;
default:
IRDA_DEBUG(1, __FUNCTION__ "(), Unknown flow command!\n");
}
}
/*
* Function irttp_connect_request (self, dtsap_sel, daddr, qos)
*
* Try to connect to remote destination TSAP selector
*
*/
int irttp_connect_request(struct tsap_cb *self, __u8 dtsap_sel,
__u32 saddr, __u32 daddr,
struct qos_info *qos, __u32 max_sdu_size,
struct sk_buff *userdata)
{
struct sk_buff *skb;
__u8 *frame;
__u8 n;
IRDA_DEBUG(4, __FUNCTION__ "(), max_sdu_size=%d\n", max_sdu_size);
ASSERT(self != NULL, return -EBADR;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -EBADR;);
if (self->connected)
return -EISCONN;
/* Any userdata supplied? */
if (userdata == NULL) {
skb = dev_alloc_skb(64);
if (!skb)
return -ENOMEM;
/* Reserve space for MUX_CONTROL and LAP header */
skb_reserve(skb, TTP_MAX_HEADER);
} else {
skb = userdata;
/*
* Check that the client has reserved enough space for
* headers
*/
ASSERT(skb_headroom(userdata) >= TTP_MAX_HEADER, return -1;);
}
/* Initialize connection parameters */
self->connected = FALSE;
self->avail_credit = 0;
self->rx_max_sdu_size = max_sdu_size;
self->rx_sdu_size = 0;
self->rx_sdu_busy = FALSE;
self->dtsap_sel = dtsap_sel;
n = self->initial_credit;
self->remote_credit = 0;
self->send_credit = 0;
/*
* Give away max 127 credits for now
*/
if (n > 127) {
self->avail_credit=n-127;
n = 127;
}
self->remote_credit = n;
/* SAR enabled? */
if (max_sdu_size > 0) {
ASSERT(skb_headroom(skb) >= (TTP_MAX_HEADER + TTP_SAR_HEADER),
return -1;);
/* Insert SAR parameters */
frame = skb_push(skb, TTP_HEADER+TTP_SAR_HEADER);
frame[0] = TTP_PARAMETERS | n;
frame[1] = 0x04; /* Length */
frame[2] = 0x01; /* MaxSduSize */
frame[3] = 0x02; /* Value length */
put_unaligned(cpu_to_be16((__u16) max_sdu_size),
(__u16 *)(frame+4));
} else {
/* Insert plain TTP header */
frame = skb_push(skb, TTP_HEADER);
/* Insert initial credit in frame */
frame[0] = n & 0x7f;
}
/* Connect with IrLMP. No QoS parameters for now */
return irlmp_connect_request(self->lsap, dtsap_sel, saddr, daddr, qos,
skb);
}
/*
* Function irttp_connect_confirm (handle, qos, skb)
*
* Sevice user confirms TSAP connection with peer.
*
*/
static void irttp_connect_confirm(void *instance, void *sap,
struct qos_info *qos, __u32 max_seg_size,
__u8 max_header_size, struct sk_buff *skb)
{
struct tsap_cb *self;
int parameters;
int ret;
__u8 plen;
__u8 n;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
ASSERT(skb != NULL, return;);
self->max_seg_size = max_seg_size - TTP_HEADER;
self->max_header_size = max_header_size + TTP_HEADER;
/*
* Check if we have got some QoS parameters back! This should be the
* negotiated QoS for the link.
*/
if (qos) {
IRDA_DEBUG(4, "IrTTP, Negotiated BAUD_RATE: %02x\n",
qos->baud_rate.bits);
IRDA_DEBUG(4, "IrTTP, Negotiated BAUD_RATE: %d bps.\n",
qos->baud_rate.value);
}
n = skb->data[0] & 0x7f;
IRDA_DEBUG(4, __FUNCTION__ "(), Initial send_credit=%d\n", n);
self->send_credit = n;
self->tx_max_sdu_size = 0;
self->connected = TRUE;
parameters = skb->data[0] & 0x80;
ASSERT(skb->len >= TTP_HEADER, return;);
skb_pull(skb, TTP_HEADER);
if (parameters) {
plen = skb->data[0];
ret = irda_param_extract_all(self, skb->data+1,
IRDA_MIN(skb->len-1, plen),
¶m_info);
/* Any errors in the parameter list? */
if (ret < 0) {
WARNING(__FUNCTION__
"(), error extracting parameters\n");
dev_kfree_skb(skb);
/* Do not accept this connection attempt */
return;
}
/* Remove parameters */
skb_pull(skb, IRDA_MIN(skb->len, plen+1));
}
IRDA_DEBUG(4, __FUNCTION__ "() send=%d,avail=%d,remote=%d\n",
self->send_credit, self->avail_credit, self->remote_credit);
IRDA_DEBUG(2, __FUNCTION__ "(), MaxSduSize=%d\n", self->tx_max_sdu_size);
if (self->notify.connect_confirm) {
self->notify.connect_confirm(self->notify.instance, self, qos,
self->tx_max_sdu_size,
self->max_header_size, skb);
}
}
/*
* Function irttp_connect_indication (handle, skb)
*
* Some other device is connecting to this TSAP
*
*/
void irttp_connect_indication(void *instance, void *sap, struct qos_info *qos,
__u32 max_seg_size, __u8 max_header_size,
struct sk_buff *skb)
{
struct tsap_cb *self;
struct lsap_cb *lsap;
int parameters;
int ret;
__u8 plen;
__u8 n;
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
ASSERT(skb != NULL, return;);
lsap = (struct lsap_cb *) sap;
self->max_seg_size = max_seg_size - TTP_HEADER;;
self->max_header_size = max_header_size+TTP_HEADER;
IRDA_DEBUG(4, __FUNCTION__ "(), TSAP sel=%02x\n", self->stsap_sel);
/* Need to update dtsap_sel if its equal to LSAP_ANY */
self->dtsap_sel = lsap->dlsap_sel;
n = skb->data[0] & 0x7f;
self->send_credit = n;
self->tx_max_sdu_size = 0;
parameters = skb->data[0] & 0x80;
ASSERT(skb->len >= TTP_HEADER, return;);
skb_pull(skb, TTP_HEADER);
if (parameters) {
plen = skb->data[0];
ret = irda_param_extract_all(self, skb->data+1,
IRDA_MIN(skb->len-1, plen),
¶m_info);
/* Any errors in the parameter list? */
if (ret < 0) {
WARNING(__FUNCTION__
"(), error extracting parameters\n");
dev_kfree_skb(skb);
/* Do not accept this connection attempt */
return;
}
/* Remove parameters */
skb_pull(skb, IRDA_MIN(skb->len, plen+1));
}
if (self->notify.connect_indication) {
self->notify.connect_indication(self->notify.instance, self,
qos, self->tx_max_sdu_size,
self->max_header_size, skb);
} else
dev_kfree_skb(skb);
}
/*
* Function irttp_connect_response (handle, userdata)
*
* Service user is accepting the connection, just pass it down to
* IrLMP!
*
*/
int irttp_connect_response(struct tsap_cb *self, __u32 max_sdu_size,
struct sk_buff *userdata)
{
struct sk_buff *skb;
__u8 *frame;
int ret;
__u8 n;
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_DEBUG(4, __FUNCTION__ "(), Source TSAP selector=%02x\n",
self->stsap_sel);
/* Any userdata supplied? */
if (userdata == NULL) {
skb = dev_alloc_skb(64);
if (!skb)
return -ENOMEM;
/* Reserve space for MUX_CONTROL and LAP header */
skb_reserve(skb, TTP_MAX_HEADER);
} else {
skb = userdata;
/*
* Check that the client has reserved enough space for
* headers
*/
ASSERT(skb_headroom(skb) >= TTP_MAX_HEADER, return -1;);
}
self->avail_credit = 0;
self->remote_credit = 0;
self->rx_max_sdu_size = max_sdu_size;
self->rx_sdu_size = 0;
self->rx_sdu_busy = FALSE;
n = self->initial_credit;
/* Frame has only space for max 127 credits (7 bits) */
if (n > 127) {
self->avail_credit = n - 127;
n = 127;
}
self->remote_credit = n;
self->connected = TRUE;
/* SAR enabled? */
if (max_sdu_size > 0) {
ASSERT(skb_headroom(skb) >= (TTP_MAX_HEADER+TTP_SAR_HEADER),
return -1;);
/* Insert TTP header with SAR parameters */
frame = skb_push(skb, TTP_HEADER+TTP_SAR_HEADER);
frame[0] = TTP_PARAMETERS | n;
frame[1] = 0x04; /* Length */
/* irda_param_insert(self, IRTTP_MAX_SDU_SIZE, frame+1, */
/* TTP_SAR_HEADER, ¶m_info) */
frame[2] = 0x01; /* MaxSduSize */
frame[3] = 0x02; /* Value length */
put_unaligned(cpu_to_be16((__u16) max_sdu_size),
(__u16 *)(frame+4));
} else {
/* Insert TTP header */
frame = skb_push(skb, TTP_HEADER);
frame[0] = n & 0x7f;
}
ret = irlmp_connect_response(self->lsap, skb);
return ret;
}
/*
* Function irttp_dup (self, instance)
*
* Duplicate TSAP, can be used by servers to confirm a connection on a
* new TSAP so it can keep listening on the old one.
*/
struct tsap_cb *irttp_dup(struct tsap_cb *orig, void *instance)
{
struct tsap_cb *new;
IRDA_DEBUG(1, __FUNCTION__ "()\n");
if (!hashbin_find(irttp->tsaps, (int) orig, NULL)) {
IRDA_DEBUG(0, __FUNCTION__ "(), unable to find TSAP\n");
return NULL;
}
new = kmalloc(sizeof(struct tsap_cb), GFP_ATOMIC);
if (!new) {
IRDA_DEBUG(0, __FUNCTION__ "(), unable to kmalloc\n");
return NULL;
}
/* Dup */
memcpy(new, orig, sizeof(struct tsap_cb));
new->notify.instance = instance;
new->lsap = irlmp_dup(orig->lsap, new);
/* Not everything should be copied */
init_timer(&new->todo_timer);
skb_queue_head_init(&new->rx_queue);
skb_queue_head_init(&new->tx_queue);
skb_queue_head_init(&new->rx_fragments);
hashbin_insert(irttp->tsaps, (irda_queue_t *) new, (int) new, NULL);
return new;
}
/*
* Function irttp_disconnect_request (self)
*
* Close this connection please! If priority is high, the queued data
* segments, if any, will be deallocated first
*
*/
int irttp_disconnect_request(struct tsap_cb *self, struct sk_buff *userdata,
int priority)
{
struct sk_buff *skb;
int ret;
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
/* Already disconnected? */
if (!self->connected) {
IRDA_DEBUG(4, __FUNCTION__ "(), already disconnected!\n");
if (userdata)
dev_kfree_skb(userdata);
return -1;
}
/* Disconnect already pending ?
* We need to use an atomic operation to prevent reentry. This
* function may be called from various context, like user, timer
* for following a disconnect_indication() (i.e. net_bh).
* Jean II */
if(test_and_set_bit(0, &self->disconnect_pend)) {
IRDA_DEBUG(0, __FUNCTION__ "(), disconnect already pending\n");
if (userdata)
dev_kfree_skb(userdata);
/* Try to make some progress */
irttp_run_tx_queue(self);
return -1;
}
/*
* Check if there is still data segments in the transmit queue
*/
if (skb_queue_len(&self->tx_queue) > 0) {
if (priority == P_HIGH) {
/*
* No need to send the queued data, if we are
* disconnecting right now since the data will
* not have any usable connection to be sent on
*/
IRDA_DEBUG(1, __FUNCTION__ "High priority!!()\n" );
irttp_flush_queues(self);
} else if (priority == P_NORMAL) {
/*
* Must delay disconnect until after all data segments
* have been sent and the tx_queue is empty
*/
/* We'll reuse this one later for the disconnect */
self->disconnect_skb = userdata; /* May be NULL */
irttp_run_tx_queue(self);
irttp_start_todo_timer(self, MSECS_TO_JIFFIES(1000));
return -1;
}
}
IRDA_DEBUG(1, __FUNCTION__ "(), Disconnecting ...\n");
self->connected = FALSE;
if (!userdata) {
skb = dev_alloc_skb(64);
if (!skb)
return -ENOMEM;
/*
* Reserve space for MUX and LAP header
*/
skb_reserve(skb, TTP_MAX_HEADER);
userdata = skb;
}
ret = irlmp_disconnect_request(self->lsap, userdata);
/* The disconnect is no longer pending */
clear_bit(0, &self->disconnect_pend); /* FALSE */
return ret;
}
/*
* Function irttp_disconnect_indication (self, reason)
*
* Disconnect indication, TSAP disconnected by peer?
*
*/
void irttp_disconnect_indication(void *instance, void *sap, LM_REASON reason,
struct sk_buff *skb)
{
struct tsap_cb *self;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
/* Prevent higher layer to send more data */
self->connected = FALSE;
/* Check if client has already tried to close the TSAP */
if (self->close_pend) {
/* In this case, the higher layer is probably gone. Don't
* bother it and clean up the remains - Jean II */
if (skb)
dev_kfree_skb(skb);
irttp_close_tsap(self);
return;
}
/* If we are here, we assume that is the higher layer is still
* waiting for the disconnect notification and able to process it,
* even if he tried to disconnect. Otherwise, it would have already
* attempted to close the tsap and self->close_pend would be TRUE.
* Jean II */
/* No need to notify the client if has already tried to disconnect */
if(self->notify.disconnect_indication)
self->notify.disconnect_indication(self->notify.instance, self,
reason, skb);
else
if (skb)
dev_kfree_skb(skb);
}
/*
* Function irttp_do_data_indication (self, skb)
*
* Try to deliver reassebled skb to layer above, and requeue it if that
* for some reason should fail. We mark rx sdu as busy to apply back
* pressure is necessary.
*/
void irttp_do_data_indication(struct tsap_cb *self, struct sk_buff *skb)
{
int err;
/* Check if client has already tried to close the TSAP */
if (self->close_pend) {
dev_kfree_skb(skb);
return;
}
err = self->notify.data_indication(self->notify.instance, self, skb);
/* Usually the layer above will notify that it's input queue is
* starting to get filled by using the flow request, but this may
* be difficult, so it can instead just refuse to eat it and just
* give an error back
*/
if (err == -ENOMEM) {
IRDA_DEBUG(0, __FUNCTION__ "() requeueing skb!\n");
/* Make sure we take a break */
self->rx_sdu_busy = TRUE;
/* Need to push the header in again */
skb_push(skb, TTP_HEADER);
skb->data[0] = 0x00; /* Make sure MORE bit is cleared */
/* Put skb back on queue */
skb_queue_head(&self->rx_queue, skb);
}
}
/*
* Function irttp_run_rx_queue (self)
*
* Check if we have any frames to be transmitted, or if we have any
* available credit to give away.
*/
void irttp_run_rx_queue(struct tsap_cb *self)
{
struct sk_buff *skb;
int more = 0;
IRDA_DEBUG(2, __FUNCTION__ "() send=%d,avail=%d,remote=%d\n",
self->send_credit, self->avail_credit, self->remote_credit);
/* Get exclusive access to the rx queue, otherwise don't touch it */
if (irda_lock(&self->rx_queue_lock) == FALSE)
return;
/*
* Reassemble all frames in receive queue and deliver them
*/
while (!self->rx_sdu_busy && (skb = skb_dequeue(&self->rx_queue))) {
self->avail_credit++;
more = skb->data[0] & 0x80;
/* Remove TTP header */
skb_pull(skb, TTP_HEADER);
/* Add the length of the remaining data */
self->rx_sdu_size += skb->len;
/*
* If SAR is disabled, or user has requested no reassembly
* of received fragements then we just deliver them
* immediately. This can be requested by clients that
* implements byte streams without any message boundaries
*/
if (self->rx_max_sdu_size == TTP_SAR_DISABLE) {
irttp_do_data_indication(self, skb);
self->rx_sdu_size = 0;
continue;
}
/* Check if this is a fragment, and not the last fragment */
if (more) {
/*
* Queue the fragment if we still are within the
* limits of the maximum size of the rx_sdu
*/
if (self->rx_sdu_size <= self->rx_max_sdu_size) {
IRDA_DEBUG(4, __FUNCTION__ "(), queueing frag\n");
skb_queue_tail(&self->rx_fragments, skb);
} else {
/* Free the part of the SDU that is too big */
dev_kfree_skb(skb);
}
continue;
}
/*
* This is the last fragment, so time to reassemble!
*/
if ((self->rx_sdu_size <= self->rx_max_sdu_size) ||
(self->rx_max_sdu_size == TTP_SAR_UNBOUND))
{
/*
* A little optimizing. Only queue the fragment if
* there are other fragments. Since if this is the
* last and only fragment, there is no need to
* reassemble :-)
*/
if (!skb_queue_empty(&self->rx_fragments)) {
skb_queue_tail(&self->rx_fragments,
skb);
skb = irttp_reassemble_skb(self);
}
/* Now we can deliver the reassembled skb */
irttp_do_data_indication(self, skb);
} else {
IRDA_DEBUG(1, __FUNCTION__ "(), Truncated frame\n");
/* Free the part of the SDU that is too big */
dev_kfree_skb(skb);
/* Deliver only the valid but truncated part of SDU */
skb = irttp_reassemble_skb(self);
irttp_do_data_indication(self, skb);
}
self->rx_sdu_size = 0;
}
/* Reset lock */
self->rx_queue_lock = 0;
}
/*
* Function irttp_flush_queues (self)
*
* Flushes (removes all frames) in transitt-buffer (tx_list)
*/
void irttp_flush_queues(struct tsap_cb *self)
{
struct sk_buff* skb;
IRDA_DEBUG(4, __FUNCTION__ "()\n");
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
/* Deallocate frames waiting to be sent */
while ((skb = skb_dequeue(&self->tx_queue)) != NULL)
dev_kfree_skb(skb);
/* Deallocate received frames */
while ((skb = skb_dequeue(&self->rx_queue)) != NULL)
dev_kfree_skb(skb);
/* Deallocate received fragments */
while ((skb = skb_dequeue(&self->rx_fragments)) != NULL)
dev_kfree_skb(skb);
}
/*
* Function irttp_reasseble (self)
*
* Makes a new (continuous) skb of all the fragments in the fragment
* queue
*
*/
static struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self)
{
struct sk_buff *skb, *frag;
int n = 0; /* Fragment index */
ASSERT(self != NULL, return NULL;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return NULL;);
IRDA_DEBUG(2, __FUNCTION__ "(), self->rx_sdu_size=%d\n",
self->rx_sdu_size);
skb = dev_alloc_skb(TTP_HEADER + self->rx_sdu_size);
if (!skb)
return NULL;
/*
* Need to reserve space for TTP header in case this skb needs to
* be requeued in case delivery failes
*/
skb_reserve(skb, TTP_HEADER);
skb_put(skb, self->rx_sdu_size);
/*
* Copy all fragments to a new buffer
*/
while ((frag = skb_dequeue(&self->rx_fragments)) != NULL) {
memcpy(skb->data+n, frag->data, frag->len);
n += frag->len;
dev_kfree_skb(frag);
}
IRDA_DEBUG(2, __FUNCTION__ "(), frame len=%d\n", n);
IRDA_DEBUG(2, __FUNCTION__ "(), rx_sdu_size=%d\n", self->rx_sdu_size);
ASSERT(n <= self->rx_sdu_size, return NULL;);
/* Set the new length */
skb_trim(skb, n);
self->rx_sdu_size = 0;
return skb;
}
/*
* Function irttp_fragment_skb (skb)
*
* Fragments a frame and queues all the fragments for transmission
*
*/
static void irttp_fragment_skb(struct tsap_cb *self, struct sk_buff *skb)
{
struct sk_buff *frag;
__u8 *frame;
IRDA_DEBUG(2, __FUNCTION__ "()\n");
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
ASSERT(skb != NULL, return;);
/*
* Split frame into a number of segments
*/
while (skb->len > self->max_seg_size) {
IRDA_DEBUG(2, __FUNCTION__ "(), fragmenting ...\n");
/* Make new segment */
frag = dev_alloc_skb(self->max_seg_size+self->max_header_size);
if (!frag)
return;
skb_reserve(frag, self->max_header_size);
/* Copy data from the original skb into this fragment. */
memcpy(skb_put(frag, self->max_seg_size), skb->data,
self->max_seg_size);
/* Insert TTP header, with the more bit set */
frame = skb_push(frag, TTP_HEADER);
frame[0] = TTP_MORE;
/* Hide the copied data from the original skb */
skb_pull(skb, self->max_seg_size);
/* Queue fragment */
skb_queue_tail(&self->tx_queue, frag);
}
/* Queue what is left of the original skb */
IRDA_DEBUG(2, __FUNCTION__ "(), queuing last segment\n");
frame = skb_push(skb, TTP_HEADER);
frame[0] = 0x00; /* Clear more bit */
/* Queue fragment */
skb_queue_tail(&self->tx_queue, skb);
}
/*
* Function irttp_param_max_sdu_size (self, param)
*
* Handle the MaxSduSize parameter in the connect frames, this function
* will be called both when this parameter needs to be inserted into, and
* extracted from the connect frames
*/
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param,
int get)
{
struct tsap_cb *self;
self = (struct tsap_cb *) instance;
ASSERT(self != NULL, return -1;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
if (get)
param->pv.i = self->tx_max_sdu_size;
else
self->tx_max_sdu_size = param->pv.i;
IRDA_DEBUG(1, __FUNCTION__ "(), MaxSduSize=%d\n", param->pv.i);
return 0;
}
/*
* Function irttp_todo_expired (data)
*
* Todo timer has expired!
*
*/
static void irttp_todo_expired(unsigned long data)
{
struct tsap_cb *self = (struct tsap_cb *) data;
/* Check that we still exist */
if (!self || self->magic != TTP_TSAP_MAGIC)
return;
irttp_run_rx_queue(self);
irttp_run_tx_queue(self);
/* Give avay some credits to peer? */
if ((self->remote_credit < TTP_LOW_THRESHOLD) &&
(self->avail_credit > 0) && (skb_queue_empty(&self->tx_queue)))
{
irttp_give_credit(self);
}
/* Check if time for disconnect */
if (test_bit(0, &self->disconnect_pend)) {
/* Check if it's possible to disconnect yet */
if (skb_queue_empty(&self->tx_queue)) {
/* Make sure disconnect is not pending anymore */
clear_bit(0, &self->disconnect_pend); /* FALSE */
/* Note : self->disconnect_skb may be NULL */
irttp_disconnect_request(self, self->disconnect_skb,
P_NORMAL);
self->disconnect_skb = NULL;
} else {
/* Try again later */
irttp_start_todo_timer(self, 1*HZ);
/* No reason to try and close now */
return;
}
}
/* Check if it's closing time */
if (self->close_pend)
irttp_close_tsap(self);
}
/*
* Function irttp_start_todo_timer (self, timeout)
*
* Start todo timer.
*
*/
static void irttp_start_todo_timer(struct tsap_cb *self, int timeout)
{
ASSERT(self != NULL, return;);
ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
del_timer(&self->todo_timer);
self->todo_timer.data = (unsigned long) self;
self->todo_timer.function = &irttp_todo_expired;
self->todo_timer.expires = jiffies + timeout;
add_timer(&self->todo_timer);
}
#ifdef CONFIG_PROC_FS
/*
* Function irttp_proc_read (buf, start, offset, len, unused)
*
* Give some info to the /proc file system
*/
int irttp_proc_read(char *buf, char **start, off_t offset, int len)
{
struct tsap_cb *self;
unsigned long flags;
int i = 0;
ASSERT(irttp != NULL, return 0;);
len = 0;
save_flags(flags);
cli();
self = (struct tsap_cb *) hashbin_get_first(irttp->tsaps);
while (self != NULL) {
if (!self || self->magic != TTP_TSAP_MAGIC)
break;
len += sprintf(buf+len, "TSAP %d, ", i++);
len += sprintf(buf+len, "stsap_sel: %02x, ",
self->stsap_sel);
len += sprintf(buf+len, "dtsap_sel: %02x\n",
self->dtsap_sel);
len += sprintf(buf+len, " connected: %s, ",
self->connected? "TRUE":"FALSE");
len += sprintf(buf+len, "avail credit: %d, ",
self->avail_credit);
len += sprintf(buf+len, "remote credit: %d, ",
self->remote_credit);
len += sprintf(buf+len, "send credit: %d\n",
self->send_credit);
len += sprintf(buf+len, " tx packets: %ld, ",
self->stats.tx_packets);
len += sprintf(buf+len, "rx packets: %ld, ",
self->stats.rx_packets);
len += sprintf(buf+len, "tx_queue len: %d ",
skb_queue_len(&self->tx_queue));
len += sprintf(buf+len, "rx_queue len: %d\n",
skb_queue_len(&self->rx_queue));
len += sprintf(buf+len, " tx_sdu_busy: %s, ",
self->tx_sdu_busy? "TRUE":"FALSE");
len += sprintf(buf+len, "rx_sdu_busy: %s\n",
self->rx_sdu_busy? "TRUE":"FALSE");
len += sprintf(buf+len, " max_seg_size: %d, ",
self->max_seg_size);
len += sprintf(buf+len, "tx_max_sdu_size: %d, ",
self->tx_max_sdu_size);
len += sprintf(buf+len, "rx_max_sdu_size: %d\n",
self->rx_max_sdu_size);
len += sprintf(buf+len, " Used by (%s)\n",
self->notify.name);
len += sprintf(buf+len, "\n");
self = (struct tsap_cb *) hashbin_get_next(irttp->tsaps);
}
restore_flags(flags);
return len;
}
#endif /* PROC_FS */
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