patch-2.3.15 linux/net/atm/signaling.c

• Lines: 259
• Date: Mon Aug 23 09:56:32 1999
• Orig file: v2.3.14/linux/net/atm/signaling.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.14/linux/net/atm/signaling.c linux/net/atm/signaling.c
@@ -0,0 +1,258 @@
+/* net/atm/signaling.c - ATM signaling */
+
+/* Written 1995-1999 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 "tunable.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;
+static wait_queue_head_t sigd_sleep;
+
+
+static void sigd_put_skb(struct sk_buff *skb)
+{
+#ifdef WAIT_FOR_DEMON
+	static unsigned long silence = 0;
+#endif
+
+	while (!sigd) {
+#ifdef WAIT_FOR_DEMON
+		if (time_after(jiffies, silence) || silence == 0) {
+			printk(KERN_INFO "atmsvc: waiting for signaling demon "
+			    "...\n");
+			silence = (jiffies+30*HZ)|1;
+		}
+		sleep_on(&sigd_sleep);
+#else
+		printk(KERN_WARNING "atmsvc: no signaling demon\n");
+		kfree_skb(skb);
+		return;
+#endif
+	}
+	atm_force_charge(sigd,skb->truesize);
+	skb_queue_tail(&sigd->recvq,skb);
+	wake_up(&sigd->sleep);
+}
+
+
+static void modify_qos(struct atm_vcc *vcc,struct atmsvc_msg *msg)
+{
+	struct sk_buff *skb;
+
+	if ((vcc->flags & ATM_VF_RELEASED) || !(vcc->flags & ATM_VF_READY))
+		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;
+
+	msg = (struct atmsvc_msg *) skb->data;
+	atomic_sub(skb->truesize+ATM_PDU_OVHD,&vcc->tx_inuse);
+	DPRINTK("sigd_send %d (0x%lx)\n",(int) msg->type,msg->vcc);
+	vcc = (struct atm_vcc *) msg->vcc;
+	switch (msg->type) {
+		case as_okay:
+			vcc->reply = msg->reply;
+			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:
+			vcc->flags &= ~(ATM_VF_REGIS | ATM_VF_READY);
+			vcc->reply = msg->reply;
+			break;
+		case as_indicate:
+			vcc = (struct atm_vcc *) msg->listen_vcc;
+			DPRINTK("as_indicate!!!\n");
+			if (!vcc->backlog_quota) {
+				sigd_enq(0,as_reject,vcc,NULL,NULL);
+				return 0;
+			}
+			vcc->backlog_quota--;
+			skb_queue_tail(&vcc->listenq,skb);
+			if (vcc->callback) {
+				DPRINTK("waking vcc->sleep 0x%p\n",
+				    &vcc->sleep);
+				vcc->callback(vcc);
+			}
+			return 0;
+		case as_close:
+			vcc->flags |= ATM_VF_RELEASED;
+			vcc->flags &= ~ATM_VF_READY;
+			vcc->reply = msg->reply;
+			break;
+		case as_modify:
+			modify_qos(vcc,msg);
+			break;
+		default:
+			printk(KERN_ALERT "sigd_send: bad message type %d\n",
+			    (int) msg->type);
+			return -EINVAL;
+	}
+	if (vcc->callback) vcc->callback(vcc);
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+
+void sigd_enq(struct atm_vcc *vcc,enum atmsvc_msg_type type,
+    const struct atm_vcc *listen_vcc,const struct sockaddr_atmpvc *pvc,
+    const struct sockaddr_atmsvc *svc)
+{
+	struct sk_buff *skb;
+	struct atmsvc_msg *msg;
+
+	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));
+	msg->type = type;
+	msg->vcc = (unsigned long) vcc;
+	msg->listen_vcc = (unsigned long) listen_vcc;
+	msg->reply = 0; /* other ISP applications may use this field */
+	if (vcc) {
+		msg->qos = vcc->qos;
+		msg->sap = vcc->sap;
+	}
+	if (!svc) msg->svc.sas_family = 0;
+	else msg->svc = *svc;
+	if (vcc) msg->local = vcc->local;
+	if (!pvc) memset(&msg->pvc,0,sizeof(msg->pvc));
+	else msg->pvc = *pvc;
+	sigd_put_skb(skb);
+	if (vcc) vcc->flags |= ATM_VF_REGIS;
+}
+
+
+static void purge_vccs(struct atm_vcc *vcc)
+{
+	while (vcc) {
+		if (vcc->family == PF_ATMSVC &&
+		    !(vcc->flags & ATM_VF_META)) {
+			vcc->flags |= ATM_VF_RELEASED;
+			vcc->reply = -EUNATCH;
+			wake_up(&vcc->sleep);
+		}
+		vcc = vcc->next;
+	}
+}
+
+
+static void sigd_close(struct atm_vcc *vcc)
+{
+	struct sk_buff *skb;
+	struct atm_dev *dev;
+
+	DPRINTK("sigd_close\n");
+	sigd = NULL;
+	if (skb_peek(&vcc->recvq))
+		printk(KERN_ERR "sigd_close: closing with requests pending\n");
+	while ((skb = skb_dequeue(&vcc->recvq))) kfree_skb(skb);
+	purge_vccs(nodev_vccs);
+	for (dev = atm_devs; dev; dev = dev->next) purge_vccs(dev->vccs);
+}
+
+
+static struct atmdev_ops sigd_dev_ops = {
+	NULL,		/* no dev_close */
+	NULL,		/* no open */
+	sigd_close,	/* close */
+	NULL,		/* no ioctl */
+	NULL,		/* no getsockopt */
+	NULL,		/* no setsockopt */
+	sigd_send,	/* send */
+	NULL,		/* no sg_send */
+	NULL,		/* no send_oam */
+	NULL,		/* no phy_put */
+	NULL,		/* no phy_get */
+	NULL,		/* no feedback */
+	NULL,		/* no change_qos */
+	NULL		/* no free_rx_skb */
+};
+
+
+static struct atm_dev sigd_dev = {
+	&sigd_dev_ops,
+	NULL,		/* no PHY */
+    	"sig",		/* type */
+	999,		/* dummy device number */
+	NULL,NULL,	/* pretend not to have any VCCs */
+	NULL,NULL,	/* no data */
+	0,		/* no flags */
+	NULL,		/* no local address */
+	{ 0 }		/* no ESI, no statistics */
+};
+
+
+int sigd_attach(struct atm_vcc *vcc)
+{
+	if (sigd) return -EADDRINUSE;
+	DPRINTK("sigd_attach\n");
+	sigd = vcc;
+	bind_vcc(vcc,&sigd_dev);
+	vcc->flags |= ATM_VF_READY | ATM_VF_META;
+	wake_up(&sigd_sleep);
+	return 0;
+}
+
+
+void signaling_init(void)
+{
+	init_waitqueue_head(&sigd_sleep);
+}