[deliverable/linux.git] / net / atm / signaling.c

/* net/atm/signaling.c - ATM signaling */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#include <linux/errno.h>	/* error codes */
#include <linux/kernel.h>	/* printk */
#include <linux/skbuff.h>
#include <linux/wait.h>
#include <linux/sched.h>	/* jiffies and HZ */
#include <linux/atm.h>		/* ATM stuff */
#include <linux/atmsap.h>
#include <linux/atmsvc.h>
#include <linux/atmdev.h>
#include <linux/bitops.h>

#include "resources.h"
#include "signaling.h"


#undef WAIT_FOR_DEMON		/* #define this if system calls on SVC sockets
				   should block until the demon runs.
				   Danger: may cause nasty hangs if the demon
				   crashes. */

#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif


struct atm_vcc *sigd = NULL;
#ifdef WAIT_FOR_DEMON
static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
#endif


static void sigd_put_skb(struct sk_buff *skb)
{
#ifdef WAIT_FOR_DEMON
	DECLARE_WAITQUEUE(wait,current);

	add_wait_queue(&sigd_sleep,&wait);
	while (!sigd) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		DPRINTK("atmsvc: waiting for signaling demon...\n");
		schedule();
	}
	current->state = TASK_RUNNING;
	remove_wait_queue(&sigd_sleep,&wait);
#else
	if (!sigd) {
		DPRINTK("atmsvc: no signaling demon\n");
		kfree_skb(skb);
		return;
	}
#endif
	atm_force_charge(sigd,skb->truesize);
	skb_queue_tail(&sk_atm(sigd)->sk_receive_queue,skb);
	sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
}


static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
{
	struct sk_buff *skb;

	if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
	    !test_bit(ATM_VF_READY,&vcc->flags))
		return;
	msg->type = as_error;
	if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
	else {
		/* should lock VCC */
		msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
		    msg->reply);
		if (!msg->reply) msg->type = as_okay;
	}
	/*
	 * Should probably just turn around the old skb. But the, the buffer
	 * space accounting needs to follow the change too. Maybe later.
	 */
	while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
		schedule();
	*(struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
	sigd_put_skb(skb);
}


static int sigd_send(struct atm_vcc *vcc,struct sk_buff *skb)
{
	struct atmsvc_msg *msg;
	struct atm_vcc *session_vcc;
	struct sock *sk;

	msg = (struct atmsvc_msg *) skb->data;
	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
	DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
	  (unsigned long) msg->vcc);
	vcc = *(struct atm_vcc **) &msg->vcc;
	sk = sk_atm(vcc);

	switch (msg->type) {
		case as_okay:
			sk->sk_err = -msg->reply;
			clear_bit(ATM_VF_WAITING, &vcc->flags);
			if (!*vcc->local.sas_addr.prv &&
			    !*vcc->local.sas_addr.pub) {
				vcc->local.sas_family = AF_ATMSVC;
				memcpy(vcc->local.sas_addr.prv,
				    msg->local.sas_addr.prv,ATM_ESA_LEN);
				memcpy(vcc->local.sas_addr.pub,
				    msg->local.sas_addr.pub,ATM_E164_LEN+1);
			}
			session_vcc = vcc->session ? vcc->session : vcc;
			if (session_vcc->vpi || session_vcc->vci) break;
			session_vcc->itf = msg->pvc.sap_addr.itf;
			session_vcc->vpi = msg->pvc.sap_addr.vpi;
			session_vcc->vci = msg->pvc.sap_addr.vci;
			if (session_vcc->vpi || session_vcc->vci)
				session_vcc->qos = msg->qos;
			break;
		case as_error:
			clear_bit(ATM_VF_REGIS,&vcc->flags);
			clear_bit(ATM_VF_READY,&vcc->flags);
			sk->sk_err = -msg->reply;
			clear_bit(ATM_VF_WAITING, &vcc->flags);
			break;
		case as_indicate:
			vcc = *(struct atm_vcc **) &msg->listen_vcc;
			sk = sk_atm(vcc);
			DPRINTK("as_indicate!!!\n");
			lock_sock(sk);
			if (sk_acceptq_is_full(sk)) {
				sigd_enq(NULL,as_reject,vcc,NULL,NULL);
				dev_kfree_skb(skb);
				goto as_indicate_complete;
			}
			sk->sk_ack_backlog++;
			skb_queue_tail(&sk->sk_receive_queue, skb);
			DPRINTK("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
			sk->sk_state_change(sk);
as_indicate_complete:
			release_sock(sk);
			return 0;
		case as_close:
			set_bit(ATM_VF_RELEASED,&vcc->flags);
			vcc_release_async(vcc, msg->reply);
			goto out;
		case as_modify:
			modify_qos(vcc,msg);
			break;
		case as_addparty:
		case as_dropparty:
			sk->sk_err_soft = msg->reply;	/* < 0 failure, otherwise ep_ref */
			clear_bit(ATM_VF_WAITING, &vcc->flags);
			break;
		default:
			printk(KERN_ALERT "sigd_send: bad message type %d\n",
			    (int) msg->type);
			return -EINVAL;
	}
	sk->sk_state_change(sk);
out:
	dev_kfree_skb(skb);
	return 0;
}


void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
    struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
    const struct sockaddr_atmsvc *svc,const struct atm_qos *qos,int reply)
{
	struct sk_buff *skb;
	struct atmsvc_msg *msg;
	static unsigned session = 0;

	DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
	while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
		schedule();
	msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
	memset(msg,0,sizeof(*msg));
	msg->type = type;
	*(struct atm_vcc **) &msg->vcc = vcc;
	*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
	msg->reply = reply;
	if (qos) msg->qos = *qos;
	if (vcc) msg->sap = vcc->sap;
	if (svc) msg->svc = *svc;
	if (vcc) msg->local = vcc->local;
	if (pvc) msg->pvc = *pvc;
	if (vcc) {
		if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
			msg->session = ++session;
			/* every new pmp connect gets the next session number */
	}
	sigd_put_skb(skb);
	if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
}


void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
    struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
    const struct sockaddr_atmsvc *svc)
{
	sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
	/* other ISP applications may use "reply" */
}


static void purge_vcc(struct atm_vcc *vcc)
{
	if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
	    !test_bit(ATM_VF_META, &vcc->flags)) {
		set_bit(ATM_VF_RELEASED, &vcc->flags);
		clear_bit(ATM_VF_REGIS, &vcc->flags);
		vcc_release_async(vcc, -EUNATCH);
	}
}


static void sigd_close(struct atm_vcc *vcc)
{
	struct hlist_node *node;
	struct sock *s;
	int i;

	DPRINTK("sigd_close\n");
	sigd = NULL;
	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
		printk(KERN_ERR "sigd_close: closing with requests pending\n");
	skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);

	read_lock(&vcc_sklist_lock);
	for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
		struct hlist_head *head = &vcc_hash[i];

		sk_for_each(s, node, head) {
			struct atm_vcc *vcc = atm_sk(s);

			purge_vcc(vcc);
		}
	}
	read_unlock(&vcc_sklist_lock);
}


static struct atmdev_ops sigd_dev_ops = {
	.close = sigd_close,
	.send =	sigd_send
};


static struct atm_dev sigd_dev = {
	.ops =		&sigd_dev_ops,
	.type =		"sig",
	.number =	999,
	.lock =		SPIN_LOCK_UNLOCKED
};


int sigd_attach(struct atm_vcc *vcc)
{
	if (sigd) return -EADDRINUSE;
	DPRINTK("sigd_attach\n");
	sigd = vcc;
	vcc->dev = &sigd_dev;
	vcc_insert_socket(sk_atm(vcc));
	set_bit(ATM_VF_META,&vcc->flags);
	set_bit(ATM_VF_READY,&vcc->flags);
#ifdef WAIT_FOR_DEMON
	wake_up(&sigd_sleep);
#endif
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/* net/atm/signaling.c - ATM signaling */
	2
	3	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	4
	5
	6	#include <linux/errno.h> /* error codes */
	7	#include <linux/kernel.h> /* printk */
	8	#include <linux/skbuff.h>
	9	#include <linux/wait.h>
	10	#include <linux/sched.h> /* jiffies and HZ */
	11	#include <linux/atm.h> /* ATM stuff */
	12	#include <linux/atmsap.h>
	13	#include <linux/atmsvc.h>
	14	#include <linux/atmdev.h>
	15	#include <linux/bitops.h>
	16
	17	#include "resources.h"
	18	#include "signaling.h"
	19
	20
	21	#undef WAIT_FOR_DEMON /* #define this if system calls on SVC sockets
	22	should block until the demon runs.
	23	Danger: may cause nasty hangs if the demon
	24	crashes. */
	25
	26	#if 0
	27	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	28	#else
	29	#define DPRINTK(format,args...)
	30	#endif
	31
	32
	33	struct atm_vcc *sigd = NULL;
	34	#ifdef WAIT_FOR_DEMON
	35	static DECLARE_WAIT_QUEUE_HEAD(sigd_sleep);
	36	#endif
	37
	38
	39	static void sigd_put_skb(struct sk_buff *skb)
	40	{
	41	#ifdef WAIT_FOR_DEMON
1da177e4 LT	42	DECLARE_WAITQUEUE(wait,current);
	43
	44	add_wait_queue(&sigd_sleep,&wait);
	45	while (!sigd) {
	46	set_current_state(TASK_UNINTERRUPTIBLE);
0f8f325b	47	DPRINTK("atmsvc: waiting for signaling demon...\n");
1da177e4 LT	48	schedule();
	49	}
	50	current->state = TASK_RUNNING;
	51	remove_wait_queue(&sigd_sleep,&wait);
	52	#else
	53	if (!sigd) {
0f8f325b	54	DPRINTK("atmsvc: no signaling demon\n");
1da177e4 LT	55	kfree_skb(skb);
	56	return;
	57	}
	58	#endif
	59	atm_force_charge(sigd,skb->truesize);
	60	skb_queue_tail(&sk_atm(sigd)->sk_receive_queue,skb);
	61	sk_atm(sigd)->sk_data_ready(sk_atm(sigd), skb->len);
	62	}
	63
	64
	65	static void modify_qos(struct atm_vcc vcc,struct atmsvc_msg msg)
	66	{
	67	struct sk_buff *skb;
	68
	69	if (test_bit(ATM_VF_RELEASED,&vcc->flags) \|\|
	70	!test_bit(ATM_VF_READY,&vcc->flags))
	71	return;
	72	msg->type = as_error;
	73	if (!vcc->dev->ops->change_qos) msg->reply = -EOPNOTSUPP;
	74	else {
	75	/* should lock VCC */
	76	msg->reply = vcc->dev->ops->change_qos(vcc,&msg->qos,
	77	msg->reply);
	78	if (!msg->reply) msg->type = as_okay;
	79	}
	80	/*
	81	* Should probably just turn around the old skb. But the, the buffer
	82	* space accounting needs to follow the change too. Maybe later.
	83	*/
	84	while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
	85	schedule();
	86	(struct atmsvc_msg ) skb_put(skb,sizeof(struct atmsvc_msg)) = *msg;
	87	sigd_put_skb(skb);
	88	}
	89
	90
	91	static int sigd_send(struct atm_vcc vcc,struct sk_buff skb)
	92	{
	93	struct atmsvc_msg *msg;
	94	struct atm_vcc *session_vcc;
	95	struct sock *sk;
	96
	97	msg = (struct atmsvc_msg *) skb->data;
	98	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
	99	DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,
	100	(unsigned long) msg->vcc);
	101	vcc = (struct atm_vcc *) &msg->vcc;
	102	sk = sk_atm(vcc);
	103
	104	switch (msg->type) {
	105	case as_okay:
	106	sk->sk_err = -msg->reply;
	107	clear_bit(ATM_VF_WAITING, &vcc->flags);
	108	if (!*vcc->local.sas_addr.prv &&
	109	!*vcc->local.sas_addr.pub) {
	110	vcc->local.sas_family = AF_ATMSVC;
	111	memcpy(vcc->local.sas_addr.prv,
	112	msg->local.sas_addr.prv,ATM_ESA_LEN);
	113	memcpy(vcc->local.sas_addr.pub,
	114	msg->local.sas_addr.pub,ATM_E164_LEN+1);
	115	}
	116	session_vcc = vcc->session ? vcc->session : vcc;
	117	if (session_vcc->vpi \|\| session_vcc->vci) break;
	118	session_vcc->itf = msg->pvc.sap_addr.itf;
119	session_vcc->vpi = msg->pvc.sap_addr.vpi;
120	session_vcc->vci = msg->pvc.sap_addr.vci;
121	if (session_vcc->vpi \|\| session_vcc->vci)
122	session_vcc->qos = msg->qos;
123	break;
124	case as_error:
125	clear_bit(ATM_VF_REGIS,&vcc->flags);
126	clear_bit(ATM_VF_READY,&vcc->flags);
127	sk->sk_err = -msg->reply;
128	clear_bit(ATM_VF_WAITING, &vcc->flags);
129	break;
130	case as_indicate:
131	vcc = (struct atm_vcc *) &msg->listen_vcc;
208a6dfb	132	sk = sk_atm(vcc);
1da177e4 LT	133	DPRINTK("as_indicate!!!\n");
	134	lock_sock(sk);
	135	if (sk_acceptq_is_full(sk)) {
	136	sigd_enq(NULL,as_reject,vcc,NULL,NULL);
	137	dev_kfree_skb(skb);
	138	goto as_indicate_complete;
	139	}
	140	sk->sk_ack_backlog++;
	141	skb_queue_tail(&sk->sk_receive_queue, skb);
	142	DPRINTK("waking sk->sk_sleep 0x%p\n", sk->sk_sleep);
	143	sk->sk_state_change(sk);
	144	as_indicate_complete:
	145	release_sock(sk);
	146	return 0;
	147	case as_close:
	148	set_bit(ATM_VF_RELEASED,&vcc->flags);
	149	vcc_release_async(vcc, msg->reply);
	150	goto out;
	151	case as_modify:
	152	modify_qos(vcc,msg);
	153	break;
	154	case as_addparty:
	155	case as_dropparty:
	156	sk->sk_err_soft = msg->reply; /* < 0 failure, otherwise ep_ref */
	157	clear_bit(ATM_VF_WAITING, &vcc->flags);
	158	break;
	159	default:
	160	printk(KERN_ALERT "sigd_send: bad message type %d\n",
	161	(int) msg->type);
	162	return -EINVAL;
	163	}
	164	sk->sk_state_change(sk);
	165	out:
	166	dev_kfree_skb(skb);
	167	return 0;
	168	}
	169
	170
	171	void sigd_enq2(struct atm_vcc *vcc,enum atmsvc_msg_type type,
	172	struct atm_vcc listen_vcc,const struct sockaddr_atmpvc pvc,
	173	const struct sockaddr_atmsvc svc,const struct atm_qos qos,int reply)
	174	{
	175	struct sk_buff *skb;
	176	struct atmsvc_msg *msg;
	177	static unsigned session = 0;
	178
	179	DPRINTK("sigd_enq %d (0x%p)\n",(int) type,vcc);
	180	while (!(skb = alloc_skb(sizeof(struct atmsvc_msg),GFP_KERNEL)))
	181	schedule();
	182	msg = (struct atmsvc_msg *) skb_put(skb,sizeof(struct atmsvc_msg));
	183	memset(msg,0,sizeof(*msg));
	184	msg->type = type;
	185	(struct atm_vcc *) &msg->vcc = vcc;
	186	(struct atm_vcc *) &msg->listen_vcc = listen_vcc;
	187	msg->reply = reply;
	188	if (qos) msg->qos = *qos;
	189	if (vcc) msg->sap = vcc->sap;
	190	if (svc) msg->svc = *svc;
	191	if (vcc) msg->local = vcc->local;
	192	if (pvc) msg->pvc = *pvc;
	193	if (vcc) {
	194	if (type == as_connect && test_bit(ATM_VF_SESSION, &vcc->flags))
	195	msg->session = ++session;
	196	/* every new pmp connect gets the next session number */
197	}
198	sigd_put_skb(skb);
199	if (vcc) set_bit(ATM_VF_REGIS,&vcc->flags);
200	}
201
202
203	void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
204	struct atm_vcc listen_vcc,const struct sockaddr_atmpvc pvc,
205	const struct sockaddr_atmsvc *svc)
206	{
207	sigd_enq2(vcc,type,listen_vcc,pvc,svc,vcc ? &vcc->qos : NULL,0);
208	/* other ISP applications may use "reply" */
209	}
210
211
212	static void purge_vcc(struct atm_vcc *vcc)
213	{
214	if (sk_atm(vcc)->sk_family == PF_ATMSVC &&
9301e320 CW	215	!test_bit(ATM_VF_META, &vcc->flags)) {
	216	set_bit(ATM_VF_RELEASED, &vcc->flags);
	217	clear_bit(ATM_VF_REGIS, &vcc->flags);
1da177e4 LT	218	vcc_release_async(vcc, -EUNATCH);
	219	}
	220	}
	221
	222
	223	static void sigd_close(struct atm_vcc *vcc)
	224	{
	225	struct hlist_node *node;
	226	struct sock *s;
	227	int i;
	228
	229	DPRINTK("sigd_close\n");
	230	sigd = NULL;
	231	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
	232	printk(KERN_ERR "sigd_close: closing with requests pending\n");
	233	skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
	234
	235	read_lock(&vcc_sklist_lock);
	236	for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
	237	struct hlist_head *head = &vcc_hash[i];
	238
	239	sk_for_each(s, node, head) {
	240	struct atm_vcc *vcc = atm_sk(s);
	241
9301e320	242	purge_vcc(vcc);
1da177e4 LT	243	}
	244	}
	245	read_unlock(&vcc_sklist_lock);
	246	}
	247
	248
	249	static struct atmdev_ops sigd_dev_ops = {
	250	.close = sigd_close,
	251	.send = sigd_send
	252	};
	253
	254
	255	static struct atm_dev sigd_dev = {
	256	.ops = &sigd_dev_ops,
	257	.type = "sig",
	258	.number = 999,
	259	.lock = SPIN_LOCK_UNLOCKED
	260	};
	261
	262
	263	int sigd_attach(struct atm_vcc *vcc)
	264	{
	265	if (sigd) return -EADDRINUSE;
	266	DPRINTK("sigd_attach\n");
	267	sigd = vcc;
	268	vcc->dev = &sigd_dev;
	269	vcc_insert_socket(sk_atm(vcc));
	270	set_bit(ATM_VF_META,&vcc->flags);
	271	set_bit(ATM_VF_READY,&vcc->flags);
	272	#ifdef WAIT_FOR_DEMON
	273	wake_up(&sigd_sleep);
	274	#endif
	275	return 0;
	276	}