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Commit a134be24 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
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o LAPB: use refcounts and rwlock to protect lapb_cb and list 

Also some CodingStyle code reformatting.
Ah, killed the typedef for lapb_cb.
parent 2150b1f5
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Showing with 513 additions and 363 deletions
include/net/lapb.h
View file @ a134be24
......@@ -78,8 +78,8 @@ struct lapb_frame {
/*
* The per LAPB connection control structure.
*/
typedef struct lapb_cb {
struct lapb_cb *next;
struct lapb_cb {
struct list_head node;
void *token;
/* Link status fields */
......@@ -100,43 +100,45 @@ typedef struct lapb_cb {
/* FRMR control information */
struct lapb_frame frmr_data;
unsigned char frmr_type;
} lapb_cb;
atomic_t refcnt;
};
/* lapb_iface.c */
extern void lapb_connect_confirmation(lapb_cb *, int);
extern void lapb_connect_indication(lapb_cb *, int);
extern void lapb_disconnect_confirmation(lapb_cb *, int);
extern void lapb_disconnect_indication(lapb_cb *, int);
extern int lapb_data_indication(lapb_cb *, struct sk_buff *);
extern int lapb_data_transmit(lapb_cb *, struct sk_buff *);
extern void lapb_connect_confirmation(struct lapb_cb *lapb, int);
extern void lapb_connect_indication(struct lapb_cb *lapb, int);
extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
extern void lapb_disconnect_indication(struct lapb_cb *lapb, int);
extern int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
extern int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
/* lapb_in.c */
extern void lapb_data_input(lapb_cb *, struct sk_buff *);
extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
/* lapb_out.c */
extern void lapb_kick(lapb_cb *);
extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int);
extern void lapb_establish_data_link(lapb_cb *);
extern void lapb_enquiry_response(lapb_cb *);
extern void lapb_timeout_response(lapb_cb *);
extern void lapb_check_iframes_acked(lapb_cb *, unsigned short);
extern void lapb_check_need_response(lapb_cb *, int, int);
extern void lapb_kick(struct lapb_cb *lapb);
extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
extern void lapb_establish_data_link(struct lapb_cb *lapb);
extern void lapb_enquiry_response(struct lapb_cb *lapb);
extern void lapb_timeout_response(struct lapb_cb *lapb);
extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
extern void lapb_check_need_response(struct lapb_cb *lapb, int, int);
/* lapb_subr.c */
extern void lapb_clear_queues(lapb_cb *);
extern void lapb_frames_acked(lapb_cb *, unsigned short);
extern void lapb_requeue_frames(lapb_cb *);
extern int lapb_validate_nr(lapb_cb *, unsigned short);
extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *);
extern void lapb_send_control(lapb_cb *, int, int, int);
extern void lapb_transmit_frmr(lapb_cb *);
extern void lapb_clear_queues(struct lapb_cb *lapb);
extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
extern void lapb_requeue_frames(struct lapb_cb *lapb);
extern int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
extern void lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
extern void lapb_send_control(struct lapb_cb *lapb, int, int, int);
extern void lapb_transmit_frmr(struct lapb_cb *lapb);
/* lapb_timer.c */
extern void lapb_start_t1timer(lapb_cb *);
extern void lapb_start_t2timer(lapb_cb *);
extern void lapb_stop_t1timer(lapb_cb *);
extern void lapb_stop_t2timer(lapb_cb *);
extern int lapb_t1timer_running(lapb_cb *);
extern void lapb_start_t1timer(struct lapb_cb *lapb);
extern void lapb_start_t2timer(struct lapb_cb *lapb);
extern void lapb_stop_t1timer(struct lapb_cb *lapb);
extern void lapb_stop_t2timer(struct lapb_cb *lapb);
extern int lapb_t1timer_running(struct lapb_cb *lapb);
/*
* Debug levels.
......
net/lapb/lapb_iface.c
View file @ a134be24
This diff is collapsed.
net/lapb/lapb_in.c
View file @ a134be24
This diff is collapsed.
net/lapb/lapb_out.c
View file @ a134be24
......@@ -38,56 +38,54 @@
* This procedure is passed a buffer descriptor for an iframe. It builds
* the rest of the control part of the frame and then writes it out.
*/
static void lapb_send_iframe(lapb_cb *lapb, struct sk_buff *skb, int poll_bit)
static void lapb_send_iframe(struct lapb_cb *lapb, struct sk_buff *skb, int poll_bit)
{
unsigned char *frame;
if (skb == NULL)
if (!skb)
return;
if (lapb->mode & LAPB_EXTENDED) {
frame = skb_push(skb, 2);
frame[0] = LAPB_I;
frame[0] |= (lapb->vs << 1);
frame[1] = (poll_bit) ? LAPB_EPF : 0;
frame[1] |= (lapb->vr << 1);
frame[0] |= lapb->vs << 1;
frame[1] = poll_bit ? LAPB_EPF : 0;
frame[1] |= lapb->vr << 1;
} else {
frame = skb_push(skb, 1);
*frame = LAPB_I;
*frame |= (poll_bit) ? LAPB_SPF : 0;
*frame |= (lapb->vr << 5);
*frame |= (lapb->vs << 1);
*frame |= poll_bit ? LAPB_SPF : 0;
*frame |= lapb->vr << 5;
*frame |= lapb->vs << 1;
}
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX I(%d) S%d R%d\n", lapb->token, lapb->state, poll_bit, lapb->vs, lapb->vr);
printk(KERN_DEBUG "lapb: (%p) S%d TX I(%d) S%d R%d\n",
lapb->token, lapb->state, poll_bit, lapb->vs, lapb->vr);
#endif
lapb_transmit_buffer(lapb, skb, LAPB_COMMAND);
}
void lapb_kick(lapb_cb *lapb)
void lapb_kick(struct lapb_cb *lapb)
{
struct sk_buff *skb, *skbn;
unsigned short modulus, start, end;
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
start = (skb_peek(&lapb->ack_queue) == NULL) ? lapb->va : lapb->vs;
start = !skb_peek(&lapb->ack_queue) ? lapb->va : lapb->vs;
end = (lapb->va + lapb->window) % modulus;
if (!(lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) &&
start != end &&
skb_peek(&lapb->write_queue) != NULL) {
start != end && skb_peek(&lapb->write_queue)) {
lapb->vs = start;
/*
* Dequeue the frame and copy it.
*/
skb = skb_dequeue(&lapb->write_queue);
skb = skb_dequeue(&lapb->write_queue);
do {
if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
......@@ -95,7 +93,7 @@ void lapb_kick(lapb_cb *lapb)
break;
}
if (skb->sk != NULL)
if (skb->sk)
skb_set_owner_w(skbn, skb->sk);
/*
......@@ -119,7 +117,7 @@ void lapb_kick(lapb_cb *lapb)
}
}
void lapb_transmit_buffer(lapb_cb *lapb, struct sk_buff *skb, int type)
void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *skb, int type)
{
unsigned char *ptr;
......@@ -152,26 +150,30 @@ void lapb_transmit_buffer(lapb_cb *lapb, struct sk_buff *skb, int type)
}
#if LAPB_DEBUG > 2
printk(KERN_DEBUG "lapb: (%p) S%d TX %02X %02X %02X\n", lapb->token, lapb->state, skb->data[0], skb->data[1], skb->data[2]);
printk(KERN_DEBUG "lapb: (%p) S%d TX %02X %02X %02X\n",
lapb->token, lapb->state,
skb->data[0], skb->data[1], skb->data[2]);
#endif
if (!lapb_data_transmit(lapb, skb))
kfree_skb(skb);
}
void lapb_establish_data_link(lapb_cb *lapb)
void lapb_establish_data_link(struct lapb_cb *lapb)
{
lapb->condition = 0x00;
lapb->n2count = 0;
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX SABME(1)\n", lapb->token, lapb->state);
printk(KERN_DEBUG "lapb: (%p) S%d TX SABME(1)\n",
lapb->token, lapb->state);
#endif
lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX SABM(1)\n", lapb->token, lapb->state);
printk(KERN_DEBUG "lapb: (%p) S%d TX SABM(1)\n",
lapb->token, lapb->state);
#endif
lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
}
......@@ -180,10 +182,11 @@ void lapb_establish_data_link(lapb_cb *lapb)
lapb_stop_t2timer(lapb);
}
void lapb_enquiry_response(lapb_cb *lapb)
void lapb_enquiry_response(struct lapb_cb *lapb)
{
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(1) R%d\n", lapb->token, lapb->state, lapb->vr);
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(1) R%d\n",
lapb->token, lapb->state, lapb->vr);
#endif
lapb_send_control(lapb, LAPB_RR, LAPB_POLLON, LAPB_RESPONSE);
......@@ -191,32 +194,30 @@ void lapb_enquiry_response(lapb_cb *lapb)
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
}
void lapb_timeout_response(lapb_cb *lapb)
void lapb_timeout_response(struct lapb_cb *lapb)
{
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(0) R%d\n", lapb->token, lapb->state, lapb->vr);
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(0) R%d\n",
lapb->token, lapb->state, lapb->vr);
#endif
lapb_send_control(lapb, LAPB_RR, LAPB_POLLOFF, LAPB_RESPONSE);
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
}
void lapb_check_iframes_acked(lapb_cb *lapb, unsigned short nr)
void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short nr)
{
if (lapb->vs == nr) {
lapb_frames_acked(lapb, nr);
lapb_stop_t1timer(lapb);
lapb->n2count = 0;
} else {
if (lapb->va != nr) {
lapb_frames_acked(lapb, nr);
lapb_start_t1timer(lapb);
}
} else if (lapb->va != nr) {
lapb_frames_acked(lapb, nr);
lapb_start_t1timer(lapb);
}
}
void lapb_check_need_response(lapb_cb *lapb, int type, int pf)
void lapb_check_need_response(struct lapb_cb *lapb, int type, int pf)
{
if (type == LAPB_COMMAND && pf)
lapb_enquiry_response(lapb);
......
net/lapb/lapb_subr.c
View file @ a134be24
......@@ -36,7 +36,7 @@
/*
* This routine purges all the queues of frames.
*/
void lapb_clear_queues(lapb_cb *lapb)
void lapb_clear_queues(struct lapb_cb *lapb)
{
skb_queue_purge(&lapb->write_queue);
skb_queue_purge(&lapb->ack_queue);
......@@ -47,7 +47,7 @@ void lapb_clear_queues(lapb_cb *lapb)
* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
* SDL diagram.
*/
void lapb_frames_acked(lapb_cb *lapb, unsigned short nr)
void lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)
{
struct sk_buff *skb;
int modulus;
......@@ -57,16 +57,15 @@ void lapb_frames_acked(lapb_cb *lapb, unsigned short nr)
/*
* Remove all the ack-ed frames from the ack queue.
*/
if (lapb->va != nr) {
while (skb_peek(&lapb->ack_queue) != NULL && lapb->va != nr) {
if (lapb->va != nr)
while (skb_peek(&lapb->ack_queue) && lapb->va != nr) {
skb = skb_dequeue(&lapb->ack_queue);
kfree_skb(skb);
lapb->va = (lapb->va + 1) % modulus;
}
}
}
void lapb_requeue_frames(lapb_cb *lapb)
void lapb_requeue_frames(struct lapb_cb *lapb)
{
struct sk_buff *skb, *skb_prev = NULL;
......@@ -76,7 +75,7 @@ void lapb_requeue_frames(lapb_cb *lapb)
* possibility of an empty output queue.
*/
while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {
if (skb_prev == NULL)
if (!skb_prev)
skb_queue_head(&lapb->write_queue, skb);
else
skb_append(skb_prev, skb);
......@@ -88,7 +87,7 @@ void lapb_requeue_frames(lapb_cb *lapb)
* Validate that the value of nr is between va and vs. Return true or
* false for testing.
*/
int lapb_validate_nr(lapb_cb *lapb, unsigned short nr)
int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)
{
unsigned short vc = lapb->va;
int modulus;
......@@ -96,25 +95,27 @@ int lapb_validate_nr(lapb_cb *lapb, unsigned short nr)
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
while (vc != lapb->vs) {
if (nr == vc) return 1;
if (nr == vc)
return 1;
vc = (vc + 1) % modulus;
}
if (nr == lapb->vs) return 1;
return 0;
return nr == lapb->vs;
}
/*
* This routine is the centralised routine for parsing the control
* information for the different frame formats.
*/
void lapb_decode(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
void lapb_decode(struct lapb_cb *lapb, struct sk_buff *skb,
struct lapb_frame *frame)
{
frame->type = LAPB_ILLEGAL;
#if LAPB_DEBUG > 2
printk(KERN_DEBUG "lapb: (%p) S%d RX %02X %02X %02X\n", lapb->token, lapb->state, skb->data[0], skb->data[1], skb->data[2]);
printk(KERN_DEBUG "lapb: (%p) S%d RX %02X %02X %02X\n",
lapb->token, lapb->state,
skb->data[0], skb->data[1], skb->data[2]);
#endif
if (lapb->mode & LAPB_MLP) {
......@@ -146,22 +147,31 @@ void lapb_decode(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
skb_pull(skb, 1);
if (lapb->mode & LAPB_EXTENDED) {
if ((skb->data[0] & LAPB_S) == 0) {
frame->type = LAPB_I; /* I frame - carries NR/NS/PF */
if (!(skb->data[0] & LAPB_S)) {
/*
* I frame - carries NR/NS/PF
*/
frame->type = LAPB_I;
frame->ns = (skb->data[0] >> 1) & 0x7F;
frame->nr = (skb->data[1] >> 1) & 0x7F;
frame->pf = skb->data[1] & LAPB_EPF;
frame->control[0] = skb->data[0];
frame->control[1] = skb->data[1];
skb_pull(skb, 2);
} else if ((skb->data[0] & LAPB_U) == 1) { /* S frame - take out PF/NR */
} else if ((skb->data[0] & LAPB_U) == 1) {
/*
* S frame - take out PF/NR
*/
frame->type = skb->data[0] & 0x0F;
frame->nr = (skb->data[1] >> 1) & 0x7F;
frame->pf = skb->data[1] & LAPB_EPF;
frame->control[0] = skb->data[0];
frame->control[1] = skb->data[1];
skb_pull(skb, 2);
} else if ((skb->data[0] & LAPB_U) == 3) { /* U frame - take out PF */
} else if ((skb->data[0] & LAPB_U) == 3) {
/*
* U frame - take out PF
*/
frame->type = skb->data[0] & ~LAPB_SPF;
frame->pf = skb->data[0] & LAPB_SPF;
frame->control[0] = skb->data[0];
......@@ -169,16 +179,25 @@ void lapb_decode(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
skb_pull(skb, 1);
}
} else {
if ((skb->data[0] & LAPB_S) == 0) {
frame->type = LAPB_I; /* I frame - carries NR/NS/PF */
if (!(skb->data[0] & LAPB_S)) {
/*
* I frame - carries NR/NS/PF
*/
frame->type = LAPB_I;
frame->ns = (skb->data[0] >> 1) & 0x07;
frame->nr = (skb->data[0] >> 5) & 0x07;
frame->pf = skb->data[0] & LAPB_SPF;
} else if ((skb->data[0] & LAPB_U) == 1) { /* S frame - take out PF/NR */
} else if ((skb->data[0] & LAPB_U) == 1) {
/*
* S frame - take out PF/NR
*/
frame->type = skb->data[0] & 0x0F;
frame->nr = (skb->data[0] >> 5) & 0x07;
frame->pf = skb->data[0] & LAPB_SPF;
} else if ((skb->data[0] & LAPB_U) == 3) { /* U frame - take out PF */
} else if ((skb->data[0] & LAPB_U) == 3) {
/*
* U frame - take out PF
*/
frame->type = skb->data[0] & ~LAPB_SPF;
frame->pf = skb->data[0] & LAPB_SPF;
}
......@@ -195,7 +214,8 @@ void lapb_decode(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
* Only supervisory or unnumbered frames are processed, FRMRs are handled
* by lapb_transmit_frmr below.
*/
void lapb_send_control(lapb_cb *lapb, int frametype, int poll_bit, int type)
void lapb_send_control(struct lapb_cb *lapb, int frametype,
int poll_bit, int type)
{
struct sk_buff *skb;
unsigned char *dptr;
......@@ -209,18 +229,18 @@ void lapb_send_control(lapb_cb *lapb, int frametype, int poll_bit, int type)
if ((frametype & LAPB_U) == LAPB_U) {
dptr = skb_put(skb, 1);
*dptr = frametype;
*dptr |= (poll_bit) ? LAPB_SPF : 0;
*dptr |= poll_bit ? LAPB_SPF : 0;
} else {
dptr = skb_put(skb, 2);
dptr[0] = frametype;
dptr[1] = (lapb->vr << 1);
dptr[1] |= (poll_bit) ? LAPB_EPF : 0;
dptr[1] |= poll_bit ? LAPB_EPF : 0;
}
} else {
dptr = skb_put(skb, 1);
*dptr = frametype;
*dptr |= (poll_bit) ? LAPB_SPF : 0;
if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */
*dptr |= poll_bit ? LAPB_SPF : 0;
if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */
*dptr |= (lapb->vr << 5);
}
......@@ -231,7 +251,7 @@ void lapb_send_control(lapb_cb *lapb, int frametype, int poll_bit, int type)
* This routine generates FRMRs based on information previously stored in
* the LAPB control block.
*/
void lapb_transmit_frmr(lapb_cb *lapb)
void lapb_transmit_frmr(struct lapb_cb *lapb)
{
struct sk_buff *skb;
unsigned char *dptr;
......@@ -254,7 +274,10 @@ void lapb_transmit_frmr(lapb_cb *lapb)
*dptr++ = lapb->frmr_type;
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X %02X %02X\n", lapb->token, lapb->state, skb->data[1], skb->data[2], skb->data[3], skb->data[4], skb->data[5]);
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X %02X %02X\n",
lapb->token, lapb->state,
skb->data[1], skb->data[2], skb->data[3],
skb->data[4], skb->data[5]);
#endif
} else {
dptr = skb_put(skb, 4);
......@@ -268,7 +291,9 @@ void lapb_transmit_frmr(lapb_cb *lapb)
*dptr++ = lapb->frmr_type;
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X\n", lapb->token, lapb->state, skb->data[1], skb->data[2], skb->data[3]);
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X\n",
lapb->token, lapb->state, skb->data[1],
skb->data[2], skb->data[3]);
#endif
}
......
net/lapb/lapb_timer.c
View file @ a134be24
......@@ -37,7 +37,7 @@
static void lapb_t1timer_expiry(unsigned long);
static void lapb_t2timer_expiry(unsigned long);
void lapb_start_t1timer(lapb_cb *lapb)
void lapb_start_t1timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t1timer);
......@@ -48,7 +48,7 @@ void lapb_start_t1timer(lapb_cb *lapb)
add_timer(&lapb->t1timer);
}
void lapb_start_t2timer(lapb_cb *lapb)
void lapb_start_t2timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t2timer);
......@@ -59,24 +59,24 @@ void lapb_start_t2timer(lapb_cb *lapb)
add_timer(&lapb->t2timer);
}
void lapb_stop_t1timer(lapb_cb *lapb)
void lapb_stop_t1timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t1timer);
}
void lapb_stop_t2timer(lapb_cb *lapb)
void lapb_stop_t2timer(struct lapb_cb *lapb)
{
del_timer(&lapb->t2timer);
}
int lapb_t1timer_running(lapb_cb *lapb)
int lapb_t1timer_running(struct lapb_cb *lapb)
{
return timer_pending(&lapb->t1timer);
}
static void lapb_t2timer_expiry(unsigned long param)
{
lapb_cb *lapb = (lapb_cb *)param;
struct lapb_cb *lapb = (struct lapb_cb *)param;
if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
......@@ -86,7 +86,7 @@ static void lapb_t2timer_expiry(unsigned long param)
static void lapb_t1timer_expiry(unsigned long param)
{
lapb_cb *lapb = (lapb_cb *)param;
struct lapb_cb *lapb = (struct lapb_cb *)param;
switch (lapb->state) {
......
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