1 files changed, 269 insertions, 0 deletions
diff --git a/net/atm/signaling.c b/net/atm/signaling.c
new file mode 100644
index 00000000..509c8ac0
--- /dev/null
+++ b/net/atm/signaling.c
@@ -0,0 +1,269 @@
+/* net/atm/signaling.c - ATM signaling */
+
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#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 <linux/slab.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. */
+
+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);
+		pr_debug("atmsvc: waiting for signaling daemon...\n");
+		schedule();
+	}
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&sigd_sleep, &wait);
+#else
+	if (!sigd) {
+		pr_debug("atmsvc: no signaling daemon\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);
+	vcc = *(struct atm_vcc **) &msg->vcc;
+	pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)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);
+		pr_debug("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);
+		pr_debug("waking sk_sleep(sk) 0x%p\n", sk_sleep(sk));
+		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:
+		pr_alert("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;
+
+	pr_debug("%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;
+
+	pr_debug("\n");
+	sigd = NULL;
+	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
+		pr_err("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) {
+			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(sigd_dev.lock)
+};
+
+int sigd_attach(struct atm_vcc *vcc)
+{
+	if (sigd)
+		return -EADDRINUSE;
+	pr_debug("\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;
+}