- 根目录:
- net
- irda
- irttp.c
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <net/irda/irda.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;
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 struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self);
static void irttp_todo_expired(unsigned long data);
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param,
int get);
static void irttp_flow_indication(void *instance, void *sap, LOCAL_FLOW flow);
static void irttp_status_indication(void *instance,
LINK_STATUS link, LOCK_STATUS lock);
static pi_minor_info_t pi_minor_call_table[] = {
{ NULL, 0 },
{ irttp_param_max_sdu_size, PV_INTEGER | PV_BIG_ENDIAN }
};
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 };
int __init irttp_init(void)
{
irttp = kzalloc(sizeof(struct irttp_cb), GFP_KERNEL);
if (irttp == NULL)
return -ENOMEM;
irttp->magic = TTP_MAGIC;
irttp->tsaps = hashbin_new(HB_LOCK);
if (!irttp->tsaps) {
IRDA_ERROR("%s: can't allocate IrTTP hashbin!\n",
__func__);
kfree(irttp);
return -ENOMEM;
}
return 0;
}
void irttp_cleanup(void)
{
IRDA_ASSERT(irttp->magic == TTP_MAGIC, return;);
hashbin_delete(irttp->tsaps, (FREE_FUNC) __irttp_close_tsap);
irttp->magic = 0;
kfree(irttp);
irttp = NULL;
}
static inline void irttp_start_todo_timer(struct tsap_cb *self, int timeout)
{
mod_timer(&self->todo_timer, jiffies + timeout);
}
static void irttp_todo_expired(unsigned long data)
{
struct tsap_cb *self = (struct tsap_cb *) data;
if (!self || self->magic != TTP_TSAP_MAGIC)
return;
IRDA_DEBUG(4, "%s(instance=%p)\n", __func__, self);
irttp_run_rx_queue(self);
irttp_run_tx_queue(self);
if (test_bit(0, &self->disconnect_pend)) {
if (skb_queue_empty(&self->tx_queue)) {
clear_bit(0, &self->disconnect_pend);
irttp_disconnect_request(self, self->disconnect_skb,
P_NORMAL);
self->disconnect_skb = NULL;
} else {
irttp_start_todo_timer(self, HZ/10);
return;
}
}
if (self->close_pend)
irttp_close_tsap(self);
}
static void irttp_flush_queues(struct tsap_cb *self)
{
struct sk_buff* skb;
IRDA_DEBUG(4, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
while ((skb = skb_dequeue(&self->tx_queue)) != NULL)
dev_kfree_skb(skb);
while ((skb = skb_dequeue(&self->rx_queue)) != NULL)
dev_kfree_skb(skb);
while ((skb = skb_dequeue(&self->rx_fragments)) != NULL)
dev_kfree_skb(skb);
}
static struct sk_buff *irttp_reassemble_skb(struct tsap_cb *self)
{
struct sk_buff *skb, *frag;
int n = 0;
IRDA_ASSERT(self != NULL, return NULL;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return NULL;);
IRDA_DEBUG(2, "%s(), self->rx_sdu_size=%d\n", __func__,
self->rx_sdu_size);
skb = dev_alloc_skb(TTP_HEADER + self->rx_sdu_size);
if (!skb)
return NULL;
skb_reserve(skb, TTP_HEADER);
skb_put(skb, self->rx_sdu_size);
while ((frag = skb_dequeue(&self->rx_fragments)) != NULL) {
skb_copy_to_linear_data_offset(skb, n, frag->data, frag->len);
n += frag->len;
dev_kfree_skb(frag);
}
IRDA_DEBUG(2,
"%s(), frame len=%d, rx_sdu_size=%d, rx_max_sdu_size=%d\n",
__func__, n, self->rx_sdu_size, self->rx_max_sdu_size);
IRDA_ASSERT(n <= self->rx_sdu_size, n = self->rx_sdu_size;);
skb_trim(skb, n);
self->rx_sdu_size = 0;
return skb;
}
static inline void irttp_fragment_skb(struct tsap_cb *self,
struct sk_buff *skb)
{
struct sk_buff *frag;
__u8 *frame;
IRDA_DEBUG(2, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
while (skb->len > self->max_seg_size) {
IRDA_DEBUG(2, "%s(), fragmenting ...\n", __func__);
frag = alloc_skb(self->max_seg_size+self->max_header_size,
GFP_ATOMIC);
if (!frag)
return;
skb_reserve(frag, self->max_header_size);
skb_copy_from_linear_data(skb, skb_put(frag, self->max_seg_size),
self->max_seg_size);
frame = skb_push(frag, TTP_HEADER);
frame[0] = TTP_MORE;
skb_pull(skb, self->max_seg_size);
skb_queue_tail(&self->tx_queue, frag);
}
IRDA_DEBUG(2, "%s(), queuing last segment\n", __func__);
frame = skb_push(skb, TTP_HEADER);
frame[0] = 0x00;
skb_queue_tail(&self->tx_queue, skb);
}
static int irttp_param_max_sdu_size(void *instance, irda_param_t *param,
int get)
{
struct tsap_cb *self;
self = instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_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, "%s(), MaxSduSize=%d\n", __func__, param->pv.i);
return 0;
}
static void irttp_init_tsap(struct tsap_cb *tsap)
{
spin_lock_init(&tsap->lock);
init_timer(&tsap->todo_timer);
skb_queue_head_init(&tsap->rx_queue);
skb_queue_head_init(&tsap->tx_queue);
skb_queue_head_init(&tsap->rx_fragments);
}
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;
IRDA_ASSERT(irttp->magic == TTP_MAGIC, return NULL;);
if((stsap_sel != LSAP_ANY) &&
((stsap_sel < 0x01) || (stsap_sel >= 0x70))) {
IRDA_DEBUG(0, "%s(), invalid tsap!\n", __func__);
return NULL;
}
self = kzalloc(sizeof(struct tsap_cb), GFP_ATOMIC);
if (self == NULL) {
IRDA_DEBUG(0, "%s(), unable to kmalloc!\n", __func__);
return NULL;
}
irttp_init_tsap(self);
self->todo_timer.data = (unsigned long) self;
self->todo_timer.function = &irttp_todo_expired;
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;
ttp_notify.flow_indication = irttp_flow_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;
lsap = irlmp_open_lsap(stsap_sel, &ttp_notify, 0);
if (lsap == NULL) {
IRDA_WARNING("%s: unable to allocate LSAP!!\n", __func__);
return NULL;
}
self->stsap_sel = lsap->slsap_sel;
IRDA_DEBUG(4, "%s(), stsap_sel=%02x\n", __func__, self->stsap_sel);
self->notify = *notify;
self->lsap = lsap;
hashbin_insert(irttp->tsaps, (irda_queue_t *) self, (long) self, NULL);
if (credit > TTP_RX_MAX_CREDIT)
self->initial_credit = TTP_RX_MAX_CREDIT;
else
self->initial_credit = credit;
return self;
}
EXPORT_SYMBOL(irttp_open_tsap);
static void __irttp_close_tsap(struct tsap_cb *self)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
irttp_flush_queues(self);
del_timer(&self->todo_timer);
if (self->disconnect_skb)
dev_kfree_skb(self->disconnect_skb);
self->connected = FALSE;
self->magic = ~TTP_TSAP_MAGIC;
kfree(self);
}
int irttp_close_tsap(struct tsap_cb *self)
{
struct tsap_cb *tsap;
IRDA_DEBUG(4, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
if (self->connected) {
if (!test_bit(0, &self->disconnect_pend)) {
IRDA_WARNING("%s: TSAP still connected!\n",
__func__);
irttp_disconnect_request(self, NULL, P_NORMAL);
}
self->close_pend = TRUE;
irttp_start_todo_timer(self, HZ/10);
return 0;
}
tsap = hashbin_remove(irttp->tsaps, (long) self, NULL);
IRDA_ASSERT(tsap == self, return -1;);
if (self->lsap) {
irlmp_close_lsap(self->lsap);
self->lsap = NULL;
}
__irttp_close_tsap(self);
return 0;
}
EXPORT_SYMBOL(irttp_close_tsap);
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
{
int ret;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(4, "%s()\n", __func__);
if (skb->len == 0) {
ret = 0;
goto err;
}
if (!self->connected) {
IRDA_WARNING("%s(), Not connected\n", __func__);
ret = -ENOTCONN;
goto err;
}
if (skb->len > self->max_seg_size) {
IRDA_ERROR("%s(), UData is too large for IrLAP!\n", __func__);
ret = -EMSGSIZE;
goto err;
}
irlmp_udata_request(self->lsap, skb);
self->stats.tx_packets++;
return 0;
err:
dev_kfree_skb(skb);
return ret;
}
EXPORT_SYMBOL(irttp_udata_request);
int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb)
{
__u8 *frame;
int ret;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__,
skb_queue_len(&self->tx_queue));
if (skb->len == 0) {
ret = 0;
goto err;
}
if (!self->connected) {
IRDA_WARNING("%s: Not connected\n", __func__);
ret = -ENOTCONN;
goto err;
}
if ((self->tx_max_sdu_size == 0) && (skb->len > self->max_seg_size)) {
IRDA_ERROR("%s: SAR disabled, and data is too large for IrLAP!\n",
__func__);
ret = -EMSGSIZE;
goto err;
}
if ((self->tx_max_sdu_size != 0) &&
(self->tx_max_sdu_size != TTP_SAR_UNBOUND) &&
(skb->len > self->tx_max_sdu_size))
{
IRDA_ERROR("%s: SAR enabled, but data is larger than TxMaxSduSize!\n",
__func__);
ret = -EMSGSIZE;
goto err;
}
if (skb_queue_len(&self->tx_queue) >= TTP_TX_MAX_QUEUE) {
irttp_run_tx_queue(self);
ret = -ENOBUFS;
goto err;
}
if ((self->tx_max_sdu_size == 0) || (skb->len < self->max_seg_size)) {
IRDA_ASSERT(skb_headroom(skb) >= TTP_HEADER, return -1;);
frame = skb_push(skb, TTP_HEADER);
frame[0] = 0x00;
skb_queue_tail(&self->tx_queue, skb);
} else {
irttp_fragment_skb(self, skb);
}
if ((!self->tx_sdu_busy) &&
(skb_queue_len(&self->tx_queue) > TTP_TX_HIGH_THRESHOLD)) {
if (self->notify.flow_indication) {
self->notify.flow_indication(self->notify.instance,
self, FLOW_STOP);
}
self->tx_sdu_busy = TRUE;
}
irttp_run_tx_queue(self);
return 0;
err:
dev_kfree_skb(skb);
return ret;
}
EXPORT_SYMBOL(irttp_data_request);
static void irttp_run_tx_queue(struct tsap_cb *self)
{
struct sk_buff *skb;
unsigned long flags;
int n;
IRDA_DEBUG(2, "%s() : send_credit = %d, queue_len = %d\n",
__func__,
self->send_credit, skb_queue_len(&self->tx_queue));
if (irda_lock(&self->tx_queue_lock) == FALSE)
return;
while ((self->send_credit > 0) &&
(!irlmp_lap_tx_queue_full(self->lsap)) &&
(skb = skb_dequeue(&self->tx_queue)))
{
spin_lock_irqsave(&self->lock, flags);
n = self->avail_credit;
self->avail_credit = 0;
if (n > 127) {
self->avail_credit = n-127;
n = 127;
}
self->remote_credit += n;
self->send_credit--;
spin_unlock_irqrestore(&self->lock, flags);
skb->data[0] |= (n & 0x7f);
if (skb->sk != NULL) {
skb_orphan(skb);
}
irlmp_data_request(self->lsap, skb);
self->stats.tx_packets++;
}
if ((self->tx_sdu_busy) &&
(skb_queue_len(&self->tx_queue) < TTP_TX_LOW_THRESHOLD) &&
(!self->close_pend))
{
if (self->notify.flow_indication)
self->notify.flow_indication(self->notify.instance,
self, FLOW_START);
self->tx_sdu_busy = FALSE;
}
self->tx_queue_lock = 0;
}
static inline void irttp_give_credit(struct tsap_cb *self)
{
struct sk_buff *tx_skb = NULL;
unsigned long flags;
int n;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_DEBUG(4, "%s() send=%d,avail=%d,remote=%d\n",
__func__,
self->send_credit, self->avail_credit, self->remote_credit);
tx_skb = alloc_skb(TTP_MAX_HEADER, GFP_ATOMIC);
if (!tx_skb)
return;
skb_reserve(tx_skb, LMP_MAX_HEADER);
spin_lock_irqsave(&self->lock, flags);
n = self->avail_credit;
self->avail_credit = 0;
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++;
}
static int irttp_udata_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct tsap_cb *self;
int err;
IRDA_DEBUG(4, "%s()\n", __func__);
self = instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
self->stats.rx_packets++;
if (self->notify.udata_indication) {
err = self->notify.udata_indication(self->notify.instance,
self,skb);
if (!err)
return 0;
}
dev_kfree_skb(skb);
return 0;
}
static int irttp_data_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct tsap_cb *self;
unsigned long flags;
int n;
self = instance;
n = skb->data[0] & 0x7f;
self->stats.rx_packets++;
spin_lock_irqsave(&self->lock, flags);
self->send_credit += n;
if (skb->len > 1)
self->remote_credit--;
spin_unlock_irqrestore(&self->lock, flags);
if (skb->len > 1) {
skb_queue_tail(&self->rx_queue, skb);
} else {
dev_kfree_skb(skb);
}
irttp_run_rx_queue(self);
if (self->send_credit == n) {
irttp_run_tx_queue(self);
}
return 0;
}
static void irttp_status_indication(void *instance,
LINK_STATUS link, LOCK_STATUS lock)
{
struct tsap_cb *self;
IRDA_DEBUG(4, "%s()\n", __func__);
self = instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
if (self->close_pend)
return;
if (self->notify.status_indication != NULL)
self->notify.status_indication(self->notify.instance,
link, lock);
else
IRDA_DEBUG(2, "%s(), no handler\n", __func__);
}
static void irttp_flow_indication(void *instance, void *sap, LOCAL_FLOW flow)
{
struct tsap_cb *self;
self = instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_DEBUG(4, "%s(instance=%p)\n", __func__, self);
irttp_run_tx_queue(self);
if(self->disconnect_pend)
irttp_start_todo_timer(self, 0);
}
void irttp_flow_request(struct tsap_cb *self, LOCAL_FLOW flow)
{
IRDA_DEBUG(1, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
switch (flow) {
case FLOW_STOP:
IRDA_DEBUG(1, "%s(), flow stop\n", __func__);
self->rx_sdu_busy = TRUE;
break;
case FLOW_START:
IRDA_DEBUG(1, "%s(), flow start\n", __func__);
self->rx_sdu_busy = FALSE;
irttp_run_rx_queue(self);
break;
default:
IRDA_DEBUG(1, "%s(), Unknown flow command!\n", __func__);
}
}
EXPORT_SYMBOL(irttp_flow_request);
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 *tx_skb;
__u8 *frame;
__u8 n;
IRDA_DEBUG(4, "%s(), max_sdu_size=%d\n", __func__, max_sdu_size);
IRDA_ASSERT(self != NULL, return -EBADR;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -EBADR;);
if (self->connected) {
if(userdata)
dev_kfree_skb(userdata);
return -EISCONN;
}
if (userdata == NULL) {
tx_skb = alloc_skb(TTP_MAX_HEADER + TTP_SAR_HEADER,
GFP_ATOMIC);
if (!tx_skb)
return -ENOMEM;
skb_reserve(tx_skb, TTP_MAX_HEADER + TTP_SAR_HEADER);
} else {
tx_skb = userdata;
IRDA_ASSERT(skb_headroom(userdata) >= TTP_MAX_HEADER,
{ dev_kfree_skb(userdata); return -1; } );
}
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;
if (n > 127) {
self->avail_credit=n-127;
n = 127;
}
self->remote_credit = n;
if (max_sdu_size > 0) {
IRDA_ASSERT(skb_headroom(tx_skb) >= (TTP_MAX_HEADER + TTP_SAR_HEADER),
{ dev_kfree_skb(tx_skb); return -1; } );
frame = skb_push(tx_skb, TTP_HEADER+TTP_SAR_HEADER);
frame[0] = TTP_PARAMETERS | n;
frame[1] = 0x04;
frame[2] = 0x01;
frame[3] = 0x02;
put_unaligned(cpu_to_be16((__u16) max_sdu_size),
(__be16 *)(frame+4));
} else {
frame = skb_push(tx_skb, TTP_HEADER);
frame[0] = n & 0x7f;
}
return irlmp_connect_request(self->lsap, dtsap_sel, saddr, daddr, qos,
tx_skb);
}
EXPORT_SYMBOL(irttp_connect_request);
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, "%s()\n", __func__);
self = instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
self->max_seg_size = max_seg_size - TTP_HEADER;
self->max_header_size = max_header_size + TTP_HEADER;
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, "%s(), Initial send_credit=%d\n", __func__, n);
self->send_credit = n;
self->tx_max_sdu_size = 0;
self->connected = TRUE;
parameters = skb->data[0] & 0x80;
IRDA_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);
if (ret < 0) {
IRDA_WARNING("%s: error extracting parameters\n",
__func__);
dev_kfree_skb(skb);
return;
}
skb_pull(skb, IRDA_MIN(skb->len, plen+1));
}
IRDA_DEBUG(4, "%s() send=%d,avail=%d,remote=%d\n", __func__,
self->send_credit, self->avail_credit, self->remote_credit);
IRDA_DEBUG(2, "%s(), MaxSduSize=%d\n", __func__,
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);
} else
dev_kfree_skb(skb);
}
static 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 = instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
lsap = sap;
self->max_seg_size = max_seg_size - TTP_HEADER;
self->max_header_size = max_header_size+TTP_HEADER;
IRDA_DEBUG(4, "%s(), TSAP sel=%02x\n", __func__, self->stsap_sel);
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;
IRDA_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);
if (ret < 0) {
IRDA_WARNING("%s: error extracting parameters\n",
__func__);
dev_kfree_skb(skb);
return;
}
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);
}
int irttp_connect_response(struct tsap_cb *self, __u32 max_sdu_size,
struct sk_buff *userdata)
{
struct sk_buff *tx_skb;
__u8 *frame;
int ret;
__u8 n;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_DEBUG(4, "%s(), Source TSAP selector=%02x\n", __func__,
self->stsap_sel);
if (userdata == NULL) {
tx_skb = alloc_skb(TTP_MAX_HEADER + TTP_SAR_HEADER,
GFP_ATOMIC);
if (!tx_skb)
return -ENOMEM;
skb_reserve(tx_skb, TTP_MAX_HEADER + TTP_SAR_HEADER);
} else {
tx_skb = userdata;
IRDA_ASSERT(skb_headroom(userdata) >= TTP_MAX_HEADER,
{ dev_kfree_skb(userdata); 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;
if (n > 127) {
self->avail_credit = n - 127;
n = 127;
}
self->remote_credit = n;
self->connected = TRUE;
if (max_sdu_size > 0) {
IRDA_ASSERT(skb_headroom(tx_skb) >= (TTP_MAX_HEADER + TTP_SAR_HEADER),
{ dev_kfree_skb(tx_skb); return -1; } );
frame = skb_push(tx_skb, TTP_HEADER+TTP_SAR_HEADER);
frame[0] = TTP_PARAMETERS | n;
frame[1] = 0x04;
frame[2] = 0x01;
frame[3] = 0x02;
put_unaligned(cpu_to_be16((__u16) max_sdu_size),
(__be16 *)(frame+4));
} else {
frame = skb_push(tx_skb, TTP_HEADER);
frame[0] = n & 0x7f;
}
ret = irlmp_connect_response(self->lsap, tx_skb);
return ret;
}
EXPORT_SYMBOL(irttp_connect_response);
struct tsap_cb *irttp_dup(struct tsap_cb *orig, void *instance)
{
struct tsap_cb *new;
unsigned long flags;
IRDA_DEBUG(1, "%s()\n", __func__);
spin_lock_irqsave(&irttp->tsaps->hb_spinlock, flags);
if (!hashbin_find(irttp->tsaps, (long) orig, NULL)) {
IRDA_DEBUG(0, "%s(), unable to find TSAP\n", __func__);
spin_unlock_irqrestore(&irttp->tsaps->hb_spinlock, flags);
return NULL;
}
new = kmemdup(orig, sizeof(struct tsap_cb), GFP_ATOMIC);
if (!new) {
IRDA_DEBUG(0, "%s(), unable to kmalloc\n", __func__);
spin_unlock_irqrestore(&irttp->tsaps->hb_spinlock, flags);
return NULL;
}
spin_lock_init(&new->lock);
spin_unlock_irqrestore(&irttp->tsaps->hb_spinlock, flags);
new->lsap = irlmp_dup(orig->lsap, new);
if (!new->lsap) {
IRDA_DEBUG(0, "%s(), dup failed!\n", __func__);
kfree(new);
return NULL;
}
new->notify.instance = instance;
irttp_init_tsap(new);
hashbin_insert(irttp->tsaps, (irda_queue_t *) new, (long) new, NULL);
return new;
}
EXPORT_SYMBOL(irttp_dup);
int irttp_disconnect_request(struct tsap_cb *self, struct sk_buff *userdata,
int priority)
{
int ret;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
if (!self->connected) {
IRDA_DEBUG(4, "%s(), already disconnected!\n", __func__);
if (userdata)
dev_kfree_skb(userdata);
return -1;
}
if(test_and_set_bit(0, &self->disconnect_pend)) {
IRDA_DEBUG(0, "%s(), disconnect already pending\n",
__func__);
if (userdata)
dev_kfree_skb(userdata);
irttp_run_tx_queue(self);
return -1;
}
if (!skb_queue_empty(&self->tx_queue)) {
if (priority == P_HIGH) {
IRDA_DEBUG(1, "%s(): High priority!!()\n", __func__);
irttp_flush_queues(self);
} else if (priority == P_NORMAL) {
self->disconnect_skb = userdata;
irttp_run_tx_queue(self);
irttp_start_todo_timer(self, HZ/10);
return -1;
}
}
IRDA_DEBUG(1, "%s(), Disconnecting ...\n", __func__);
self->connected = FALSE;
if (!userdata) {
struct sk_buff *tx_skb;
tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
if (!tx_skb)
return -ENOMEM;
skb_reserve(tx_skb, LMP_MAX_HEADER);
userdata = tx_skb;
}
ret = irlmp_disconnect_request(self->lsap, userdata);
clear_bit(0, &self->disconnect_pend);
return ret;
}
EXPORT_SYMBOL(irttp_disconnect_request);
static void irttp_disconnect_indication(void *instance, void *sap,
LM_REASON reason, struct sk_buff *skb)
{
struct tsap_cb *self;
IRDA_DEBUG(4, "%s()\n", __func__);
self = instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return;);
self->connected = FALSE;
if (self->close_pend) {
if (skb)
dev_kfree_skb(skb);
irttp_close_tsap(self);
return;
}
if(self->notify.disconnect_indication)
self->notify.disconnect_indication(self->notify.instance, self,
reason, skb);
else
if (skb)
dev_kfree_skb(skb);
}
static void irttp_do_data_indication(struct tsap_cb *self, struct sk_buff *skb)
{
int err;
if (self->close_pend) {
dev_kfree_skb(skb);
return;
}
err = self->notify.data_indication(self->notify.instance, self, skb);
if (err) {
IRDA_DEBUG(0, "%s() requeueing skb!\n", __func__);
self->rx_sdu_busy = TRUE;
skb_push(skb, TTP_HEADER);
skb->data[0] = 0x00;
skb_queue_head(&self->rx_queue, skb);
}
}
static void irttp_run_rx_queue(struct tsap_cb *self)
{
struct sk_buff *skb;
int more = 0;
IRDA_DEBUG(2, "%s() send=%d,avail=%d,remote=%d\n", __func__,
self->send_credit, self->avail_credit, self->remote_credit);
if (irda_lock(&self->rx_queue_lock) == FALSE)
return;
while (!self->rx_sdu_busy && (skb = skb_dequeue(&self->rx_queue))) {
more = skb->data[0] & 0x80;
skb_pull(skb, TTP_HEADER);
self->rx_sdu_size += skb->len;
if (self->rx_max_sdu_size == TTP_SAR_DISABLE) {
irttp_do_data_indication(self, skb);
self->rx_sdu_size = 0;
continue;
}
if (more) {
if (self->rx_sdu_size <= self->rx_max_sdu_size) {
IRDA_DEBUG(4, "%s(), queueing frag\n",
__func__);
skb_queue_tail(&self->rx_fragments, skb);
} else {
dev_kfree_skb(skb);
}
continue;
}
if ((self->rx_sdu_size <= self->rx_max_sdu_size) ||
(self->rx_max_sdu_size == TTP_SAR_UNBOUND))
{
if (!skb_queue_empty(&self->rx_fragments)) {
skb_queue_tail(&self->rx_fragments,
skb);
skb = irttp_reassemble_skb(self);
}
irttp_do_data_indication(self, skb);
} else {
IRDA_DEBUG(1, "%s(), Truncated frame\n", __func__);
dev_kfree_skb(skb);
skb = irttp_reassemble_skb(self);
irttp_do_data_indication(self, skb);
}
self->rx_sdu_size = 0;
}
self->avail_credit = (self->initial_credit -
(self->remote_credit +
skb_queue_len(&self->rx_queue) +
skb_queue_len(&self->rx_fragments)));
if ((self->remote_credit <= TTP_RX_MIN_CREDIT) &&
(self->avail_credit > 0)) {
irttp_give_credit(self);
}
self->rx_queue_lock = 0;
}
#ifdef CONFIG_PROC_FS
struct irttp_iter_state {
int id;
};
static void *irttp_seq_start(struct seq_file *seq, loff_t *pos)
{
struct irttp_iter_state *iter = seq->private;
struct tsap_cb *self;
spin_lock_irq(&irttp->tsaps->hb_spinlock);
iter->id = 0;
for (self = (struct tsap_cb *) hashbin_get_first(irttp->tsaps);
self != NULL;
self = (struct tsap_cb *) hashbin_get_next(irttp->tsaps)) {
if (iter->id == *pos)
break;
++iter->id;
}
return self;
}
static void *irttp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct irttp_iter_state *iter = seq->private;
++*pos;
++iter->id;
return (void *) hashbin_get_next(irttp->tsaps);
}
static void irttp_seq_stop(struct seq_file *seq, void *v)
{
spin_unlock_irq(&irttp->tsaps->hb_spinlock);
}
static int irttp_seq_show(struct seq_file *seq, void *v)
{
const struct irttp_iter_state *iter = seq->private;
const struct tsap_cb *self = v;
seq_printf(seq, "TSAP %d, ", iter->id);
seq_printf(seq, "stsap_sel: %02x, ",
self->stsap_sel);
seq_printf(seq, "dtsap_sel: %02x\n",
self->dtsap_sel);
seq_printf(seq, " connected: %s, ",
self->connected? "TRUE":"FALSE");
seq_printf(seq, "avail credit: %d, ",
self->avail_credit);
seq_printf(seq, "remote credit: %d, ",
self->remote_credit);
seq_printf(seq, "send credit: %d\n",
self->send_credit);
seq_printf(seq, " tx packets: %lu, ",
self->stats.tx_packets);
seq_printf(seq, "rx packets: %lu, ",
self->stats.rx_packets);
seq_printf(seq, "tx_queue len: %u ",
skb_queue_len(&self->tx_queue));
seq_printf(seq, "rx_queue len: %u\n",
skb_queue_len(&self->rx_queue));
seq_printf(seq, " tx_sdu_busy: %s, ",
self->tx_sdu_busy? "TRUE":"FALSE");
seq_printf(seq, "rx_sdu_busy: %s\n",
self->rx_sdu_busy? "TRUE":"FALSE");
seq_printf(seq, " max_seg_size: %u, ",
self->max_seg_size);
seq_printf(seq, "tx_max_sdu_size: %u, ",
self->tx_max_sdu_size);
seq_printf(seq, "rx_max_sdu_size: %u\n",
self->rx_max_sdu_size);
seq_printf(seq, " Used by (%s)\n\n",
self->notify.name);
return 0;
}
static const struct seq_operations irttp_seq_ops = {
.start = irttp_seq_start,
.next = irttp_seq_next,
.stop = irttp_seq_stop,
.show = irttp_seq_show,
};
static int irttp_seq_open(struct inode *inode, struct file *file)
{
return seq_open_private(file, &irttp_seq_ops,
sizeof(struct irttp_iter_state));
}
const struct file_operations irttp_seq_fops = {
.owner = THIS_MODULE,
.open = irttp_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
#endif
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