/* net/atm/signaling.c - ATM signaling */
|
/* net/atm/signaling.c - ATM signaling */
|
|
|
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
|
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
|
|
|
|
|
#include <linux/errno.h> /* error codes */
|
#include <linux/errno.h> /* error codes */
|
#include <linux/kernel.h> /* printk */
|
#include <linux/kernel.h> /* printk */
|
#include <linux/skbuff.h>
|
#include <linux/skbuff.h>
|
#include <linux/wait.h>
|
#include <linux/wait.h>
|
#include <linux/sched.h> /* jiffies and HZ */
|
#include <linux/sched.h> /* jiffies and HZ */
|
#include <linux/atm.h> /* ATM stuff */
|
#include <linux/atm.h> /* ATM stuff */
|
#include <linux/atmsap.h>
|
#include <linux/atmsap.h>
|
#include <linux/atmsvc.h>
|
#include <linux/atmsvc.h>
|
#include <linux/atmdev.h>
|
#include <linux/atmdev.h>
|
#include <linux/bitops.h>
|
#include <linux/bitops.h>
|
|
|
#include "resources.h"
|
#include "resources.h"
|
#include "signaling.h"
|
#include "signaling.h"
|
|
|
|
|
#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
|
#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
|
should block until the demon runs.
|
should block until the demon runs.
|
Danger: may cause nasty hangs if the demon
|
Danger: may cause nasty hangs if the demon
|
crashes. */
|
crashes. */
|
|
|
#if 0
|
#if 0
|
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
|
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
|
#else
|
#else
|
#define DPRINTK(format,args...)
|
#define DPRINTK(format,args...)
|
#endif
|
#endif
|
|
|
|
|
struct atm_vcc *sigd = NULL;
|
struct atm_vcc *sigd = NULL;
|
static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
|
static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
|
|
|
|
|
static void sigd_put_skb(struct sk_buff *skb)
|
static void sigd_put_skb(struct sk_buff *skb)
|
{
|
{
|
#ifdef WAIT_FOR_DEMON
|
#ifdef WAIT_FOR_DEMON
|
static unsigned long silence = 0;
|
static unsigned long silence = 0;
|
DECLARE_WAITQUEUE(wait,current);
|
DECLARE_WAITQUEUE(wait,current);
|
|
|
add_wait_queue(&sigd_sleep,&wait);
|
add_wait_queue(&sigd_sleep,&wait);
|
while (!sigd) {
|
while (!sigd) {
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
if (time_after(jiffies, silence) || silence == 0) {
|
if (time_after(jiffies, silence) || silence == 0) {
|
printk(KERN_INFO "atmsvc: waiting for signaling demon "
|
printk(KERN_INFO "atmsvc: waiting for signaling demon "
|
"...\n");
|
"...\n");
|
silence = (jiffies+30*HZ)|1;
|
silence = (jiffies+30*HZ)|1;
|
}
|
}
|
schedule();
|
schedule();
|
}
|
}
|
current->state = TASK_RUNNING;
|
current->state = TASK_RUNNING;
|
remove_wait_queue(&sigd_sleep,&wait);
|
remove_wait_queue(&sigd_sleep,&wait);
|
#else
|
#else
|
if (!sigd) {
|
if (!sigd) {
|
printk(KERN_WARNING "atmsvc: no signaling demon\n");
|
printk(KERN_WARNING "atmsvc: no signaling demon\n");
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return;
|
return;
|
}
|
}
|
#endif
|
#endif
|
atm_force_charge(sigd,skb->truesize);
|
atm_force_charge(sigd,skb->truesize);
|
skb_queue_tail(&sigd->sk->receive_queue,skb);
|
skb_queue_tail(&sigd->sk->receive_queue,skb);
|
wake_up(&sigd->sleep);
|
wake_up(&sigd->sleep);
|
}
|
}
|
|
|
|
|
static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
|
static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
|
|
if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
|
if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
|
!test_bit(ATM_VF_READY,&vcc->flags))
|
!test_bit(ATM_VF_READY,&vcc->flags))
|
return;
|
return;
|
msg->type = as_error;
|
msg->type = as_error;
|
if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
|
if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
|
else {
|
else {
|
/* should lock VCC */
|
/* should lock VCC */
|
msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
|
msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
|
msg->reply);
|
msg->reply);
|
if (!msg->reply) msg->type = as_okay;
|
if (!msg->reply) msg->type = as_okay;
|
}
|
}
|
/*
|
/*
|
* Should probably just turn around the old skb. But the, the buffer
|
* Should probably just turn around the old skb. But the, the buffer
|
* space accounting needs to follow the change too. Maybe later.
|
* space accounting needs to follow the change too. Maybe later.
|
*/
|
*/
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
|
schedule();
|
schedule();
|
*(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
|
*(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
|
sigd_put_skb(skb);
|
sigd_put_skb(skb);
|
}
|
}
|
|
|
|
|
static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
|
static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
|
{
|
{
|
struct atmsvc_msg *msg;
|
struct atmsvc_msg *msg;
|
struct atm_vcc *session_vcc;
|
struct atm_vcc *session_vcc;
|
|
|
msg = (struct atmsvc_msg *) skb->data;
|
msg = (struct atmsvc_msg *) skb->data;
|
atomic_sub(skb->truesize, &vcc->sk->wmem_alloc);
|
atomic_sub(skb->truesize, &vcc->sk->wmem_alloc);
|
DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
|
DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
|
(unsigned long) msg->vcc);
|
(unsigned long) msg->vcc);
|
vcc = *(struct atm_vcc **) &msg->vcc;
|
vcc = *(struct atm_vcc **) &msg->vcc;
|
switch (msg->type) {
|
switch (msg->type) {
|
case as_okay:
|
case as_okay:
|
vcc->reply = msg->reply;
|
vcc->reply = msg->reply;
|
if (!*vcc->local.sas_addr.prv &&
|
if (!*vcc->local.sas_addr.prv &&
|
!*vcc->local.sas_addr.pub) {
|
!*vcc->local.sas_addr.pub) {
|
vcc->local.sas_family = AF_ATMSVC;
|
vcc->local.sas_family = AF_ATMSVC;
|
memcpy(vcc->local.sas_addr.prv,
|
memcpy(vcc->local.sas_addr.prv,
|
msg->local.sas_addr.prv,ATM_ESA_LEN);
|
msg->local.sas_addr.prv,ATM_ESA_LEN);
|
memcpy(vcc->local.sas_addr.pub,
|
memcpy(vcc->local.sas_addr.pub,
|
msg->local.sas_addr.pub,ATM_E164_LEN+1);
|
msg->local.sas_addr.pub,ATM_E164_LEN+1);
|
}
|
}
|
session_vcc = vcc->session ? vcc->session : vcc;
|
session_vcc = vcc->session ? vcc->session : vcc;
|
if (session_vcc->vpi || session_vcc->vci) break;
|
if (session_vcc->vpi || session_vcc->vci) break;
|
session_vcc->itf = msg->pvc.sap_addr.itf;
|
session_vcc->itf = msg->pvc.sap_addr.itf;
|
session_vcc->vpi = msg->pvc.sap_addr.vpi;
|
session_vcc->vpi = msg->pvc.sap_addr.vpi;
|
session_vcc->vci = msg->pvc.sap_addr.vci;
|
session_vcc->vci = msg->pvc.sap_addr.vci;
|
if (session_vcc->vpi || session_vcc->vci)
|
if (session_vcc->vpi || session_vcc->vci)
|
session_vcc->qos = msg->qos;
|
session_vcc->qos = msg->qos;
|
break;
|
break;
|
case as_error:
|
case as_error:
|
clear_bit(ATM_VF_REGIS,&vcc->flags);
|
clear_bit(ATM_VF_REGIS,&vcc->flags);
|
clear_bit(ATM_VF_READY,&vcc->flags);
|
clear_bit(ATM_VF_READY,&vcc->flags);
|
vcc->reply = msg->reply;
|
vcc->reply = msg->reply;
|
vcc->sk->err = -msg->reply;
|
vcc->sk->err = -msg->reply;
|
break;
|
break;
|
case as_indicate:
|
case as_indicate:
|
vcc = *(struct atm_vcc **) &msg->listen_vcc;
|
vcc = *(struct atm_vcc **) &msg->listen_vcc;
|
DPRINTK("as_indicate!!!\n");
|
DPRINTK("as_indicate!!!\n");
|
lock_sock(vcc->sk);
|
lock_sock(vcc->sk);
|
if (vcc->sk->ack_backlog == vcc->sk->max_ack_backlog) {
|
if (vcc->sk->ack_backlog == vcc->sk->max_ack_backlog) {
|
sigd_enq(0,as_reject,vcc,NULL,NULL);
|
sigd_enq(0,as_reject,vcc,NULL,NULL);
|
goto as_indicate_complete;
|
goto as_indicate_complete;
|
}
|
}
|
vcc->sk->ack_backlog++;
|
vcc->sk->ack_backlog++;
|
skb_queue_tail(&vcc->sk->receive_queue,skb);
|
skb_queue_tail(&vcc->sk->receive_queue,skb);
|
if (vcc->callback) {
|
if (vcc->callback) {
|
DPRINTK("waking vcc->sleep 0x%p\n",
|
DPRINTK("waking vcc->sleep 0x%p\n",
|
&vcc->sleep);
|
&vcc->sleep);
|
vcc->callback(vcc);
|
vcc->callback(vcc);
|
}
|
}
|
as_indicate_complete:
|
as_indicate_complete:
|
release_sock(vcc->sk);
|
release_sock(vcc->sk);
|
return 0;
|
return 0;
|
case as_close:
|
case as_close:
|
set_bit(ATM_VF_RELEASED,&vcc->flags);
|
set_bit(ATM_VF_RELEASED,&vcc->flags);
|
clear_bit(ATM_VF_READY,&vcc->flags);
|
clear_bit(ATM_VF_READY,&vcc->flags);
|
vcc->reply = msg->reply;
|
vcc->reply = msg->reply;
|
vcc->sk->err = -msg->reply;
|
vcc->sk->err = -msg->reply;
|
break;
|
break;
|
case as_modify:
|
case as_modify:
|
modify_qos(vcc,msg);
|
modify_qos(vcc,msg);
|
break;
|
break;
|
default:
|
default:
|
printk(KERN_ALERT "sigd_send: bad message type %d\n",
|
printk(KERN_ALERT "sigd_send: bad message type %d\n",
|
(int) msg->type);
|
(int) msg->type);
|
return -EINVAL;
|
return -EINVAL;
|
}
|
}
|
if (vcc->callback) vcc->callback(vcc);
|
if (vcc->callback) vcc->callback(vcc);
|
dev_kfree_skb(skb);
|
dev_kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
|
void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
|
struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
|
struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
|
const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
|
const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
struct atmsvc_msg *msg;
|
struct atmsvc_msg *msg;
|
|
|
DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
|
DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
|
while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
|
schedule();
|
schedule();
|
msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
|
msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
|
memset(msg,0,sizeof(*msg));
|
memset(msg,0,sizeof(*msg));
|
msg->type = type;
|
msg->type = type;
|
*(struct atm_vcc **) &msg->vcc = vcc;
|
*(struct atm_vcc **) &msg->vcc = vcc;
|
*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
|
*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
|
msg->reply = reply;
|
msg->reply = reply;
|
if (qos) msg->qos = *qos;
|
if (qos) msg->qos = *qos;
|
if (vcc) msg->sap = vcc->sap;
|
if (vcc) msg->sap = vcc->sap;
|
if (svc) msg->svc = *svc;
|
if (svc) msg->svc = *svc;
|
if (vcc) msg->local = vcc->local;
|
if (vcc) msg->local = vcc->local;
|
if (pvc) msg->pvc = *pvc;
|
if (pvc) msg->pvc = *pvc;
|
sigd_put_skb(skb);
|
sigd_put_skb(skb);
|
if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
|
if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
|
}
|
}
|
|
|
|
|
void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
|
void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
|
struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
|
struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
|
const struct sockaddr_atmsvc *svc)
|
const struct sockaddr_atmsvc *svc)
|
{
|
{
|
sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
|
sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
|
/* other ISP applications may use "reply" */
|
/* other ISP applications may use "reply" */
|
}
|
}
|
|
|
|
|
static void purge_vcc(struct atm_vcc *vcc)
|
static void purge_vcc(struct atm_vcc *vcc)
|
{
|
{
|
if (vcc->sk->family == PF_ATMSVC &&
|
if (vcc->sk->family == PF_ATMSVC &&
|
!test_bit(ATM_VF_META, &vcc->flags)) {
|
!test_bit(ATM_VF_META, &vcc->flags)) {
|
set_bit(ATM_VF_RELEASED, &vcc->flags);
|
set_bit(ATM_VF_RELEASED, &vcc->flags);
|
vcc->reply = -EUNATCH;
|
vcc->reply = -EUNATCH;
|
vcc->sk->err = EUNATCH;
|
vcc->sk->err = EUNATCH;
|
wake_up(&vcc->sleep);
|
wake_up(&vcc->sleep);
|
}
|
}
|
}
|
}
|
|
|
|
|
static void sigd_close(struct atm_vcc *vcc)
|
static void sigd_close(struct atm_vcc *vcc)
|
{
|
{
|
struct sock *s;
|
struct sock *s;
|
|
|
DPRINTK("sigd_close\n");
|
DPRINTK("sigd_close\n");
|
sigd = NULL;
|
sigd = NULL;
|
if (skb_peek(&vcc->sk->receive_queue))
|
if (skb_peek(&vcc->sk->receive_queue))
|
printk(KERN_ERR "sigd_close: closing with requests pending\n");
|
printk(KERN_ERR "sigd_close: closing with requests pending\n");
|
skb_queue_purge(&vcc->sk->receive_queue);
|
skb_queue_purge(&vcc->sk->receive_queue);
|
|
|
read_lock(&vcc_sklist_lock);
|
read_lock(&vcc_sklist_lock);
|
for(s = vcc_sklist; s; s = s->next) {
|
for(s = vcc_sklist; s; s = s->next) {
|
struct atm_vcc *vcc = s->protinfo.af_atm;
|
struct atm_vcc *vcc = s->protinfo.af_atm;
|
|
|
if (vcc->dev)
|
if (vcc->dev)
|
purge_vcc(vcc);
|
purge_vcc(vcc);
|
}
|
}
|
read_unlock(&vcc_sklist_lock);
|
read_unlock(&vcc_sklist_lock);
|
}
|
}
|
|
|
|
|
static struct atmdev_ops sigd_dev_ops = {
|
static struct atmdev_ops sigd_dev_ops = {
|
.close = sigd_close,
|
.close = sigd_close,
|
.send = sigd_send
|
.send = sigd_send
|
};
|
};
|
|
|
|
|
static struct atm_dev sigd_dev = {
|
static struct atm_dev sigd_dev = {
|
.ops = &sigd_dev_ops,
|
.ops = &sigd_dev_ops,
|
.type = "sig",
|
.type = "sig",
|
.number = 999,
|
.number = 999,
|
.lock = SPIN_LOCK_UNLOCKED
|
.lock = SPIN_LOCK_UNLOCKED
|
};
|
};
|
|
|
|
|
int sigd_attach(struct atm_vcc *vcc)
|
int sigd_attach(struct atm_vcc *vcc)
|
{
|
{
|
if (sigd) return -EADDRINUSE;
|
if (sigd) return -EADDRINUSE;
|
DPRINTK("sigd_attach\n");
|
DPRINTK("sigd_attach\n");
|
sigd = vcc;
|
sigd = vcc;
|
vcc->dev = &sigd_dev;
|
vcc->dev = &sigd_dev;
|
vcc_insert_socket(vcc->sk);
|
vcc_insert_socket(vcc->sk);
|
set_bit(ATM_VF_META,&vcc->flags);
|
set_bit(ATM_VF_META,&vcc->flags);
|
set_bit(ATM_VF_READY,&vcc->flags);
|
set_bit(ATM_VF_READY,&vcc->flags);
|
wake_up(&sigd_sleep);
|
wake_up(&sigd_sleep);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
