net/atm/common.c - android_kernel_htc_msm8960 - Gitiles

 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */

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

 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

 #include <linux/module.h>
 #include <linux/kmod.h>
 #include <linux/net.h>		/* struct socket, struct proto_ops */
 #include <linux/atm.h>		/* ATM stuff */
 #include <linux/atmdev.h>
 #include <linux/socket.h>	/* SOL_SOCKET */
 #include <linux/errno.h>	/* error codes */
 #include <linux/capability.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/time.h>		/* struct timeval */
 #include <linux/skbuff.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <net/sock.h>		/* struct sock */
 #include <linux/uaccess.h>
 #include <linux/poll.h>

 #include <linux/atomic.h>

 #include "resources.h"		/* atm_find_dev */
 #include "common.h"		/* prototypes */
 #include "protocols.h"		/* atm_init_<transport> */
 #include "addr.h"		/* address registry */
 #include "signaling.h"		/* for WAITING and sigd_attach */

 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
 EXPORT_SYMBOL(vcc_hash);

 DEFINE_RWLOCK(vcc_sklist_lock);
 EXPORT_SYMBOL(vcc_sklist_lock);

 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);

 static void __vcc_insert_socket(struct sock *sk)
 {
 	struct atm_vcc *vcc = atm_sk(sk);
 	struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
 	sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
 	sk_add_node(sk, head);
 }

 void vcc_insert_socket(struct sock *sk)
 {
 	write_lock_irq(&vcc_sklist_lock);
 	__vcc_insert_socket(sk);
 	write_unlock_irq(&vcc_sklist_lock);
 }
 EXPORT_SYMBOL(vcc_insert_socket);

 static void vcc_remove_socket(struct sock *sk)
 {
 	write_lock_irq(&vcc_sklist_lock);
 	sk_del_node_init(sk);
 	write_unlock_irq(&vcc_sklist_lock);
 }

 static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size)
 {
 	struct sk_buff *skb;
 	struct sock *sk = sk_atm(vcc);

 	if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
 		pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
 			 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
 		return NULL;
 	}
 	while (!(skb = alloc_skb(size, GFP_KERNEL)))
 		schedule();
 	pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
 	atomic_add(skb->truesize, &sk->sk_wmem_alloc);
 	return skb;
 }

 static void vcc_sock_destruct(struct sock *sk)
 {
 	if (atomic_read(&sk->sk_rmem_alloc))
 		printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
 		       __func__, atomic_read(&sk->sk_rmem_alloc));

 	if (atomic_read(&sk->sk_wmem_alloc))
 		printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
 		       __func__, atomic_read(&sk->sk_wmem_alloc));
 }

 static void vcc_def_wakeup(struct sock *sk)
 {
 	struct socket_wq *wq;

 	rcu_read_lock();
 	wq = rcu_dereference(sk->sk_wq);
 	if (wq_has_sleeper(wq))
 		wake_up(&wq->wait);
 	rcu_read_unlock();
 }

 static inline int vcc_writable(struct sock *sk)
 {
 	struct atm_vcc *vcc = atm_sk(sk);

 	return (vcc->qos.txtp.max_sdu +
 		atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
 }

 static void vcc_write_space(struct sock *sk)
 {
 	struct socket_wq *wq;

 	rcu_read_lock();

 	if (vcc_writable(sk)) {
 		wq = rcu_dereference(sk->sk_wq);
 		if (wq_has_sleeper(wq))
 			wake_up_interruptible(&wq->wait);

 		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 	}

 	rcu_read_unlock();
 }

 static struct proto vcc_proto = {
 	.name	  = "VCC",
 	.owner	  = THIS_MODULE,
 	.obj_size = sizeof(struct atm_vcc),
 };

 int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
 {
 	struct sock *sk;
 	struct atm_vcc *vcc;

 	sock->sk = NULL;
 	if (sock->type == SOCK_STREAM)
 		return -EINVAL;
 	sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
 	if (!sk)
 		return -ENOMEM;
 	sock_init_data(sock, sk);
 	sk->sk_state_change = vcc_def_wakeup;
 	sk->sk_write_space = vcc_write_space;

 	vcc = atm_sk(sk);
 	vcc->dev = NULL;
 	memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
 	memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
 	vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
 	atomic_set(&sk->sk_wmem_alloc, 1);
 	atomic_set(&sk->sk_rmem_alloc, 0);
 	vcc->push = NULL;
 	vcc->pop = NULL;
 	vcc->push_oam = NULL;
 	vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
 	vcc->atm_options = vcc->aal_options = 0;
 	sk->sk_destruct = vcc_sock_destruct;
 	return 0;
 }

 static void vcc_destroy_socket(struct sock *sk)
 {
 	struct atm_vcc *vcc = atm_sk(sk);
 	struct sk_buff *skb;

 	set_bit(ATM_VF_CLOSE, &vcc->flags);
 	clear_bit(ATM_VF_READY, &vcc->flags);
 	if (vcc->dev) {
 		if (vcc->dev->ops->close)
 			vcc->dev->ops->close(vcc);
 		if (vcc->push)
 			vcc->push(vcc, NULL); /* atmarpd has no push */

 		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 			atm_return(vcc, skb->truesize);
 			kfree_skb(skb);
 		}

 		module_put(vcc->dev->ops->owner);
 		atm_dev_put(vcc->dev);
 	}

 	vcc_remove_socket(sk);
 }

 int vcc_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;

 	if (sk) {
 		lock_sock(sk);
 		vcc_destroy_socket(sock->sk);
 		release_sock(sk);
 		sock_put(sk);
 	}

 	return 0;
 }

 void vcc_release_async(struct atm_vcc *vcc, int reply)
 {
 	struct sock *sk = sk_atm(vcc);

 	set_bit(ATM_VF_CLOSE, &vcc->flags);
 	sk->sk_shutdown |= RCV_SHUTDOWN;
 	sk->sk_err = -reply;
 	clear_bit(ATM_VF_WAITING, &vcc->flags);
 	sk->sk_state_change(sk);
 }
 EXPORT_SYMBOL(vcc_release_async);

 void atm_dev_signal_change(struct atm_dev *dev, char signal)
 {
 	pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
 		__func__, signal, dev, dev->number, dev->signal);

 	/* atm driver sending invalid signal */
 	WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);

 	if (dev->signal == signal)
 		return; /* no change */

 	dev->signal = signal;

 	atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
 }
 EXPORT_SYMBOL(atm_dev_signal_change);

 void atm_dev_release_vccs(struct atm_dev *dev)
 {
 	int i;

 	write_lock_irq(&vcc_sklist_lock);
 	for (i = 0; i < VCC_HTABLE_SIZE; i++) {
 		struct hlist_head *head = &vcc_hash[i];
 		struct hlist_node *node, *tmp;
 		struct sock *s;
 		struct atm_vcc *vcc;

 		sk_for_each_safe(s, node, tmp, head) {
 			vcc = atm_sk(s);
 			if (vcc->dev == dev) {
 				vcc_release_async(vcc, -EPIPE);
 				sk_del_node_init(s);
 			}
 		}
 	}
 	write_unlock_irq(&vcc_sklist_lock);
 }
 EXPORT_SYMBOL(atm_dev_release_vccs);

 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
 {
 	int max_sdu;

 	if (!tp->traffic_class)
 		return 0;
 	switch (aal) {
 	case ATM_AAL0:
 		max_sdu = ATM_CELL_SIZE-1;
 		break;
 	case ATM_AAL34:
 		max_sdu = ATM_MAX_AAL34_PDU;
 		break;
 	default:
 		pr_warning("AAL problems ... (%d)\n", aal);
 		/* fall through */
 	case ATM_AAL5:
 		max_sdu = ATM_MAX_AAL5_PDU;
 	}
 	if (!tp->max_sdu)
 		tp->max_sdu = max_sdu;
 	else if (tp->max_sdu > max_sdu)
 		return -EINVAL;
 	if (!tp->max_cdv)
 		tp->max_cdv = ATM_MAX_CDV;
 	return 0;
 }

 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
 {
 	struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
 	struct hlist_node *node;
 	struct sock *s;
 	struct atm_vcc *walk;

 	sk_for_each(s, node, head) {
 		walk = atm_sk(s);
 		if (walk->dev != vcc->dev)
 			continue;
 		if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
 		    walk->vci == vci && ((walk->qos.txtp.traffic_class !=
 		    ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
 		    (walk->qos.rxtp.traffic_class != ATM_NONE &&
 		    vcc->qos.rxtp.traffic_class != ATM_NONE)))
 			return -EADDRINUSE;
 	}

 	/* allow VCCs with same VPI/VCI iff they don't collide on
 	   TX/RX (but we may refuse such sharing for other reasons,
 	   e.g. if protocol requires to have both channels) */

 	return 0;
 }

 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
 {
 	static short p;        /* poor man's per-device cache */
 	static int c;
 	short old_p;
 	int old_c;
 	int err;

 	if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
 		err = check_ci(vcc, *vpi, *vci);
 		return err;
 	}
 	/* last scan may have left values out of bounds for current device */
 	if (*vpi != ATM_VPI_ANY)
 		p = *vpi;
 	else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 		p = 0;
 	if (*vci != ATM_VCI_ANY)
 		c = *vci;
 	else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
 			c = ATM_NOT_RSV_VCI;
 	old_p = p;
 	old_c = c;
 	do {
 		if (!check_ci(vcc, p, c)) {
 			*vpi = p;
 			*vci = c;
 			return 0;
 		}
 		if (*vci == ATM_VCI_ANY) {
 			c++;
 			if (c >= 1 << vcc->dev->ci_range.vci_bits)
 				c = ATM_NOT_RSV_VCI;
 		}
 		if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
 		    *vpi == ATM_VPI_ANY) {
 			p++;
 			if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 				p = 0;
 		}
 	} while (old_p != p || old_c != c);
 	return -EADDRINUSE;
 }

 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
 			 int vci)
 {
 	struct sock *sk = sk_atm(vcc);
 	int error;

 	if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
 	    vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
 	    vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
 		return -EINVAL;
 	if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
 		return -EPERM;
 	error = -ENODEV;
 	if (!try_module_get(dev->ops->owner))
 		return error;
 	vcc->dev = dev;
 	write_lock_irq(&vcc_sklist_lock);
 	if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
 	    (error = find_ci(vcc, &vpi, &vci))) {
 		write_unlock_irq(&vcc_sklist_lock);
 		goto fail_module_put;
 	}
 	vcc->vpi = vpi;
 	vcc->vci = vci;
 	__vcc_insert_socket(sk);
 	write_unlock_irq(&vcc_sklist_lock);
 	switch (vcc->qos.aal) {
 	case ATM_AAL0:
 		error = atm_init_aal0(vcc);
 		vcc->stats = &dev->stats.aal0;
 		break;
 	case ATM_AAL34:
 		error = atm_init_aal34(vcc);
 		vcc->stats = &dev->stats.aal34;
 		break;
 	case ATM_NO_AAL:
 		/* ATM_AAL5 is also used in the "0 for default" case */
 		vcc->qos.aal = ATM_AAL5;
 		/* fall through */
 	case ATM_AAL5:
 		error = atm_init_aal5(vcc);
 		vcc->stats = &dev->stats.aal5;
 		break;
 	default:
 		error = -EPROTOTYPE;
 	}
 	if (!error)
 		error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
 	if (!error)
 		error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
 	if (error)
 		goto fail;
 	pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
 	pr_debug("  TX: %d, PCR %d..%d, SDU %d\n",
 		 vcc->qos.txtp.traffic_class,
 		 vcc->qos.txtp.min_pcr,
 		 vcc->qos.txtp.max_pcr,
 		 vcc->qos.txtp.max_sdu);
 	pr_debug("  RX: %d, PCR %d..%d, SDU %d\n",
 		 vcc->qos.rxtp.traffic_class,
 		 vcc->qos.rxtp.min_pcr,
 		 vcc->qos.rxtp.max_pcr,
 		 vcc->qos.rxtp.max_sdu);

 	if (dev->ops->open) {
 		error = dev->ops->open(vcc);
 		if (error)
 			goto fail;
 	}
 	return 0;

 fail:
 	vcc_remove_socket(sk);
 fail_module_put:
 	module_put(dev->ops->owner);
 	/* ensure we get dev module ref count correct */
 	vcc->dev = NULL;
 	return error;
 }

 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
 {
 	struct atm_dev *dev;
 	struct atm_vcc *vcc = ATM_SD(sock);
 	int error;

 	pr_debug("(vpi %d, vci %d)\n", vpi, vci);
 	if (sock->state == SS_CONNECTED)
 		return -EISCONN;
 	if (sock->state != SS_UNCONNECTED)
 		return -EINVAL;
 	if (!(vpi || vci))
 		return -EINVAL;

 	if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
 		clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 	else
 		if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
 			return -EINVAL;
 	pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
 		 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
 		 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
 		 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
 		 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
 		 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
 		 vcc->qos.aal == ATM_AAL5 ? "" :
 		 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
 		 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
 	if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 		return -EBADFD;
 	if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 	    vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
 		return -EINVAL;
 	if (likely(itf != ATM_ITF_ANY)) {
 		dev = try_then_request_module(atm_dev_lookup(itf),
 					      "atm-device-%d", itf);
 	} else {
 		dev = NULL;
 		mutex_lock(&atm_dev_mutex);
 		if (!list_empty(&atm_devs)) {
 			dev = list_entry(atm_devs.next,
 					 struct atm_dev, dev_list);
 			atm_dev_hold(dev);
 		}
 		mutex_unlock(&atm_dev_mutex);
 	}
 	if (!dev)
 		return -ENODEV;
 	error = __vcc_connect(vcc, dev, vpi, vci);
 	if (error) {
 		atm_dev_put(dev);
 		return error;
 	}
 	if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
 		set_bit(ATM_VF_PARTIAL, &vcc->flags);
 	if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
 		sock->state = SS_CONNECTED;
 	return 0;
 }

 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 		size_t size, int flags)
 {
 	struct sock *sk = sock->sk;
 	struct atm_vcc *vcc;
 	struct sk_buff *skb;
 	int copied, error = -EINVAL;

 	if (sock->state != SS_CONNECTED)
 		return -ENOTCONN;
 	if (flags & ~MSG_DONTWAIT)		/* only handle MSG_DONTWAIT */
 		return -EOPNOTSUPP;
 	vcc = ATM_SD(sock);
 	if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 	    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 	    !test_bit(ATM_VF_READY, &vcc->flags))
 		return 0;

 	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
 	if (!skb)
 		return error;

 	copied = skb->len;
 	if (copied > size) {
 		copied = size;
 		msg->msg_flags |= MSG_TRUNC;
 	}

 	error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 	if (error)
 		return error;
 	sock_recv_ts_and_drops(msg, sk, skb);
 	pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize);
 	atm_return(vcc, skb->truesize);
 	skb_free_datagram(sk, skb);
 	return copied;
 }

 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
 		size_t total_len)
 {
 	struct sock *sk = sock->sk;
 	DEFINE_WAIT(wait);
 	struct atm_vcc *vcc;
 	struct sk_buff *skb;
 	int eff, error;
 	const void __user *buff;
 	int size;

 	lock_sock(sk);
 	if (sock->state != SS_CONNECTED) {
 		error = -ENOTCONN;
 		goto out;
 	}
 	if (m->msg_name) {
 		error = -EISCONN;
 		goto out;
 	}
 	if (m->msg_iovlen != 1) {
 		error = -ENOSYS; /* fix this later @@@ */
 		goto out;
 	}
 	buff = m->msg_iov->iov_base;
 	size = m->msg_iov->iov_len;
 	vcc = ATM_SD(sock);
 	if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 	    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 	    !test_bit(ATM_VF_READY, &vcc->flags)) {
 		error = -EPIPE;
 		send_sig(SIGPIPE, current, 0);
 		goto out;
 	}
 	if (!size) {
 		error = 0;
 		goto out;
 	}
 	if (size < 0 || size > vcc->qos.txtp.max_sdu) {
 		error = -EMSGSIZE;
 		goto out;
 	}

 	eff = (size+3) & ~3; /* align to word boundary */
 	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 	error = 0;
 	while (!(skb = alloc_tx(vcc, eff))) {
 		if (m->msg_flags & MSG_DONTWAIT) {
 			error = -EAGAIN;
 			break;
 		}
 		schedule();
 		if (signal_pending(current)) {
 			error = -ERESTARTSYS;
 			break;
 		}
 		if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 		    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 		    !test_bit(ATM_VF_READY, &vcc->flags)) {
 			error = -EPIPE;
 			send_sig(SIGPIPE, current, 0);
 			break;
 		}
 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 	}
 	finish_wait(sk_sleep(sk), &wait);
 	if (error)
 		goto out;
 	skb->dev = NULL; /* for paths shared with net_device interfaces */
 	ATM_SKB(skb)->atm_options = vcc->atm_options;
 	if (copy_from_user(skb_put(skb, size), buff, size)) {
 		kfree_skb(skb);
 		error = -EFAULT;
 		goto out;
 	}
 	if (eff != size)
 		memset(skb->data + size, 0, eff-size);
 	error = vcc->dev->ops->send(vcc, skb);
 	error = error ? error : size;
 out:
 	release_sock(sk);
 	return error;
 }

 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
 {
 	struct sock *sk = sock->sk;
 	struct atm_vcc *vcc;
 	unsigned int mask;

 	sock_poll_wait(file, sk_sleep(sk), wait);
 	mask = 0;

 	vcc = ATM_SD(sock);

 	/* exceptional events */
 	if (sk->sk_err)
 		mask = POLLERR;

 	if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 	    test_bit(ATM_VF_CLOSE, &vcc->flags))
 		mask |= POLLHUP;

 	/* readable? */
 	if (!skb_queue_empty(&sk->sk_receive_queue))
 		mask |= POLLIN | POLLRDNORM;

 	/* writable? */
 	if (sock->state == SS_CONNECTING &&
 	    test_bit(ATM_VF_WAITING, &vcc->flags))
 		return mask;

 	if (vcc->qos.txtp.traffic_class != ATM_NONE &&
 	    vcc_writable(sk))
 		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;

 	return mask;
 }

 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 {
 	int error;

 	/*
 	 * Don't let the QoS change the already connected AAL type nor the
 	 * traffic class.
 	 */
 	if (qos->aal != vcc->qos.aal ||
 	    qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
 	    qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
 		return -EINVAL;
 	error = adjust_tp(&qos->txtp, qos->aal);
 	if (!error)
 		error = adjust_tp(&qos->rxtp, qos->aal);
 	if (error)
 		return error;
 	if (!vcc->dev->ops->change_qos)
 		return -EOPNOTSUPP;
 	if (sk_atm(vcc)->sk_family == AF_ATMPVC)
 		return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
 	return svc_change_qos(vcc, qos);
 }

 static int check_tp(const struct atm_trafprm *tp)
 {
 	/* @@@ Should be merged with adjust_tp */
 	if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
 		return 0;
 	if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
 	    !tp->max_pcr)
 		return -EINVAL;
 	if (tp->min_pcr == ATM_MAX_PCR)
 		return -EINVAL;
 	if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
 	    tp->min_pcr > tp->max_pcr)
 		return -EINVAL;
 	/*
 	 * We allow pcr to be outside [min_pcr,max_pcr], because later
 	 * adjustment may still push it in the valid range.
 	 */
 	return 0;
 }

 static int check_qos(const struct atm_qos *qos)
 {
 	int error;

 	if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
 		return -EINVAL;
 	if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
 	    qos->txtp.traffic_class && qos->rxtp.traffic_class &&
 	    qos->txtp.traffic_class != ATM_ANYCLASS &&
 	    qos->rxtp.traffic_class != ATM_ANYCLASS)
 		return -EINVAL;
 	error = check_tp(&qos->txtp);
 	if (error)
 		return error;
 	return check_tp(&qos->rxtp);
 }

 int vcc_setsockopt(struct socket *sock, int level, int optname,
 		   char __user *optval, unsigned int optlen)
 {
 	struct atm_vcc *vcc;
 	unsigned long value;
 	int error;

 	if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
 		return -EINVAL;

 	vcc = ATM_SD(sock);
 	switch (optname) {
 	case SO_ATMQOS:
 	{
 		struct atm_qos qos;

 		if (copy_from_user(&qos, optval, sizeof(qos)))
 			return -EFAULT;
 		error = check_qos(&qos);
 		if (error)
 			return error;
 		if (sock->state == SS_CONNECTED)
 			return atm_change_qos(vcc, &qos);
 		if (sock->state != SS_UNCONNECTED)
 			return -EBADFD;
 		vcc->qos = qos;
 		set_bit(ATM_VF_HASQOS, &vcc->flags);
 		return 0;
 	}
 	case SO_SETCLP:
 		if (get_user(value, (unsigned long __user *)optval))
 			return -EFAULT;
 		if (value)
 			vcc->atm_options |= ATM_ATMOPT_CLP;
 		else
 			vcc->atm_options &= ~ATM_ATMOPT_CLP;
 		return 0;
 	default:
 		if (level == SOL_SOCKET)
 			return -EINVAL;
 		break;
 	}
 	if (!vcc->dev || !vcc->dev->ops->setsockopt)
 		return -EINVAL;
 	return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
 }

 int vcc_getsockopt(struct socket *sock, int level, int optname,
 		   char __user *optval, int __user *optlen)
 {
 	struct atm_vcc *vcc;
 	int len;

 	if (get_user(len, optlen))
 		return -EFAULT;
 	if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
 		return -EINVAL;

 	vcc = ATM_SD(sock);
 	switch (optname) {
 	case SO_ATMQOS:
 		if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 			return -EINVAL;
 		return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
 			? -EFAULT : 0;
 	case SO_SETCLP:
 		return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
 				(unsigned long __user *)optval) ? -EFAULT : 0;
 	case SO_ATMPVC:
 	{
 		struct sockaddr_atmpvc pvc;

 		if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
 			return -ENOTCONN;
 		pvc.sap_family = AF_ATMPVC;
 		pvc.sap_addr.itf = vcc->dev->number;
 		pvc.sap_addr.vpi = vcc->vpi;
 		pvc.sap_addr.vci = vcc->vci;
 		return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
 	}
 	default:
 		if (level == SOL_SOCKET)
 			return -EINVAL;
 		break;
 	}
 	if (!vcc->dev || !vcc->dev->ops->getsockopt)
 		return -EINVAL;
 	return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
 }

 int register_atmdevice_notifier(struct notifier_block *nb)
 {
 	return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
 }
 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);

 void unregister_atmdevice_notifier(struct notifier_block *nb)
 {
 	atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
 }
 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);

 static int __init atm_init(void)
 {
 	int error;

 	error = proto_register(&vcc_proto, 0);
 	if (error < 0)
 		goto out;
 	error = atmpvc_init();
 	if (error < 0) {
 		pr_err("atmpvc_init() failed with %d\n", error);
 		goto out_unregister_vcc_proto;
 	}
 	error = atmsvc_init();
 	if (error < 0) {
 		pr_err("atmsvc_init() failed with %d\n", error);
 		goto out_atmpvc_exit;
 	}
 	error = atm_proc_init();
 	if (error < 0) {
 		pr_err("atm_proc_init() failed with %d\n", error);
 		goto out_atmsvc_exit;
 	}
 	error = atm_sysfs_init();
 	if (error < 0) {
 		pr_err("atm_sysfs_init() failed with %d\n", error);
 		goto out_atmproc_exit;
 	}
 out:
 	return error;
 out_atmproc_exit:
 	atm_proc_exit();
 out_atmsvc_exit:
 	atmsvc_exit();
 out_atmpvc_exit:
 	atmsvc_exit();
 out_unregister_vcc_proto:
 	proto_unregister(&vcc_proto);
 	goto out;
 }

 static void __exit atm_exit(void)
 {
 	atm_proc_exit();
 	atm_sysfs_exit();
 	atmsvc_exit();
 	atmpvc_exit();
 	proto_unregister(&vcc_proto);
 }

 subsys_initcall(atm_init);

 module_exit(atm_exit);

 MODULE_LICENSE("GPL");
 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
 MODULE_ALIAS_NETPROTO(PF_ATMSVC);
	/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */

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

	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

	#include <linux/module.h>
	#include <linux/kmod.h>
	#include <linux/net.h> /* struct socket, struct proto_ops */
	#include <linux/atm.h> /* ATM stuff */
	#include <linux/atmdev.h>
	#include <linux/socket.h> /* SOL_SOCKET */
	#include <linux/errno.h> /* error codes */
	#include <linux/capability.h>
	#include <linux/mm.h>
	#include <linux/sched.h>
	#include <linux/time.h> /* struct timeval */
	#include <linux/skbuff.h>
	#include <linux/bitops.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <net/sock.h> /* struct sock */
	#include <linux/uaccess.h>
	#include <linux/poll.h>

	#include <linux/atomic.h>

	#include "resources.h" /* atm_find_dev */
	#include "common.h" /* prototypes */
	#include "protocols.h" /* atm_init_<transport> */
	#include "addr.h" /* address registry */
	#include "signaling.h" /* for WAITING and sigd_attach */

	struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
	EXPORT_SYMBOL(vcc_hash);

	DEFINE_RWLOCK(vcc_sklist_lock);
	EXPORT_SYMBOL(vcc_sklist_lock);

	static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);

	static void __vcc_insert_socket(struct sock *sk)
	{
	struct atm_vcc *vcc = atm_sk(sk);
	struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
	sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
	sk_add_node(sk, head);
	}

	void vcc_insert_socket(struct sock *sk)
	{
	write_lock_irq(&vcc_sklist_lock);
	__vcc_insert_socket(sk);
	write_unlock_irq(&vcc_sklist_lock);
	}
	EXPORT_SYMBOL(vcc_insert_socket);

	static void vcc_remove_socket(struct sock *sk)
	{
	write_lock_irq(&vcc_sklist_lock);
	sk_del_node_init(sk);
	write_unlock_irq(&vcc_sklist_lock);
	}

	static struct sk_buff alloc_tx(struct atm_vcc vcc, unsigned int size)
	{
	struct sk_buff *skb;
	struct sock *sk = sk_atm(vcc);

	if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
	pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
	sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
	return NULL;
	}
	while (!(skb = alloc_skb(size, GFP_KERNEL)))
	schedule();
	pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
	atomic_add(skb->truesize, &sk->sk_wmem_alloc);
	return skb;
	}

	static void vcc_sock_destruct(struct sock *sk)
	{
	if (atomic_read(&sk->sk_rmem_alloc))
	printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
	__func__, atomic_read(&sk->sk_rmem_alloc));

	if (atomic_read(&sk->sk_wmem_alloc))
	printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
	__func__, atomic_read(&sk->sk_wmem_alloc));
	}

	static void vcc_def_wakeup(struct sock *sk)
	{
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
	wake_up(&wq->wait);
	rcu_read_unlock();
	}

	static inline int vcc_writable(struct sock *sk)
	{
	struct atm_vcc *vcc = atm_sk(sk);

	return (vcc->qos.txtp.max_sdu +
	atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
	}

	static void vcc_write_space(struct sock *sk)
	{
	struct socket_wq *wq;

	rcu_read_lock();

	if (vcc_writable(sk)) {
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
	wake_up_interruptible(&wq->wait);

	sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
	}

	rcu_read_unlock();
	}

	static struct proto vcc_proto = {
	.name = "VCC",
	.owner = THIS_MODULE,
	.obj_size = sizeof(struct atm_vcc),
	};

	int vcc_create(struct net net, struct socket sock, int protocol, int family)
	{
	struct sock *sk;
	struct atm_vcc *vcc;

	sock->sk = NULL;
	if (sock->type == SOCK_STREAM)
	return -EINVAL;
	sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
	if (!sk)
	return -ENOMEM;
	sock_init_data(sock, sk);
	sk->sk_state_change = vcc_def_wakeup;
	sk->sk_write_space = vcc_write_space;

	vcc = atm_sk(sk);
	vcc->dev = NULL;
	memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
	memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
	vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
	atomic_set(&sk->sk_wmem_alloc, 1);
	atomic_set(&sk->sk_rmem_alloc, 0);
	vcc->push = NULL;
	vcc->pop = NULL;
	vcc->push_oam = NULL;
	vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
	vcc->atm_options = vcc->aal_options = 0;
	sk->sk_destruct = vcc_sock_destruct;
	return 0;
	}

	static void vcc_destroy_socket(struct sock *sk)
	{
	struct atm_vcc *vcc = atm_sk(sk);
	struct sk_buff *skb;

	set_bit(ATM_VF_CLOSE, &vcc->flags);
	clear_bit(ATM_VF_READY, &vcc->flags);
	if (vcc->dev) {
	if (vcc->dev->ops->close)
	vcc->dev->ops->close(vcc);
	if (vcc->push)
	vcc->push(vcc, NULL); /* atmarpd has no push */

	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
	atm_return(vcc, skb->truesize);
	kfree_skb(skb);
	}

	module_put(vcc->dev->ops->owner);
	atm_dev_put(vcc->dev);
	}

	vcc_remove_socket(sk);
	}

	int vcc_release(struct socket *sock)
	{
	struct sock *sk = sock->sk;

	if (sk) {
	lock_sock(sk);
	vcc_destroy_socket(sock->sk);
	release_sock(sk);
	sock_put(sk);
	}

	return 0;
	}

	void vcc_release_async(struct atm_vcc *vcc, int reply)
	{
	struct sock *sk = sk_atm(vcc);

	set_bit(ATM_VF_CLOSE, &vcc->flags);
	sk->sk_shutdown \|= RCV_SHUTDOWN;
	sk->sk_err = -reply;
	clear_bit(ATM_VF_WAITING, &vcc->flags);
	sk->sk_state_change(sk);
	}
	EXPORT_SYMBOL(vcc_release_async);

	void atm_dev_signal_change(struct atm_dev *dev, char signal)
	{
	pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
	__func__, signal, dev, dev->number, dev->signal);

	/* atm driver sending invalid signal */
	WARN_ON(signal < ATM_PHY_SIG_LOST \|\| signal > ATM_PHY_SIG_FOUND);

	if (dev->signal == signal)
	return; /* no change */

	dev->signal = signal;

	atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
	}
	EXPORT_SYMBOL(atm_dev_signal_change);

	void atm_dev_release_vccs(struct atm_dev *dev)
	{
	int i;

	write_lock_irq(&vcc_sklist_lock);
	for (i = 0; i < VCC_HTABLE_SIZE; i++) {
	struct hlist_head *head = &vcc_hash[i];
	struct hlist_node node, tmp;
	struct sock *s;
	struct atm_vcc *vcc;

	sk_for_each_safe(s, node, tmp, head) {
	vcc = atm_sk(s);
	if (vcc->dev == dev) {
	vcc_release_async(vcc, -EPIPE);
	sk_del_node_init(s);
	}
	}
	}
	write_unlock_irq(&vcc_sklist_lock);
	}
	EXPORT_SYMBOL(atm_dev_release_vccs);

	static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
	{
	int max_sdu;

	if (!tp->traffic_class)
	return 0;
	switch (aal) {
	case ATM_AAL0:
	max_sdu = ATM_CELL_SIZE-1;
	break;
	case ATM_AAL34:
	max_sdu = ATM_MAX_AAL34_PDU;
	break;
	default:
	pr_warning("AAL problems ... (%d)\n", aal);
	/* fall through */
	case ATM_AAL5:
	max_sdu = ATM_MAX_AAL5_PDU;
	}
	if (!tp->max_sdu)
	tp->max_sdu = max_sdu;
	else if (tp->max_sdu > max_sdu)
	return -EINVAL;
	if (!tp->max_cdv)
	tp->max_cdv = ATM_MAX_CDV;
	return 0;
	}

	static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
	{
	struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
	struct hlist_node *node;
	struct sock *s;
	struct atm_vcc *walk;

	sk_for_each(s, node, head) {
	walk = atm_sk(s);
	if (walk->dev != vcc->dev)
	continue;
	if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
	walk->vci == vci && ((walk->qos.txtp.traffic_class !=
	ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) \|\|
	(walk->qos.rxtp.traffic_class != ATM_NONE &&
	vcc->qos.rxtp.traffic_class != ATM_NONE)))
	return -EADDRINUSE;
	}

	/* allow VCCs with same VPI/VCI iff they don't collide on
	TX/RX (but we may refuse such sharing for other reasons,
	e.g. if protocol requires to have both channels) */

	return 0;
	}

	static int find_ci(const struct atm_vcc vcc, short vpi, int *vci)
	{
	static short p; /* poor man's per-device cache */
	static int c;
	short old_p;
	int old_c;
	int err;

	if (vpi != ATM_VPI_ANY && vci != ATM_VCI_ANY) {
	err = check_ci(vcc, vpi, vci);
	return err;
	}
	/* last scan may have left values out of bounds for current device */
	if (*vpi != ATM_VPI_ANY)
	p = *vpi;
	else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
	p = 0;
	if (*vci != ATM_VCI_ANY)
	c = *vci;
	else if (c < ATM_NOT_RSV_VCI \|\| c >= 1 << vcc->dev->ci_range.vci_bits)
	c = ATM_NOT_RSV_VCI;
	old_p = p;
	old_c = c;
	do {
	if (!check_ci(vcc, p, c)) {
	*vpi = p;
	*vci = c;
	return 0;
	}
	if (*vci == ATM_VCI_ANY) {
	c++;
	if (c >= 1 << vcc->dev->ci_range.vci_bits)
	c = ATM_NOT_RSV_VCI;
	}
	if ((c == ATM_NOT_RSV_VCI \|\| *vci != ATM_VCI_ANY) &&
	*vpi == ATM_VPI_ANY) {
	p++;
	if (p >= 1 << vcc->dev->ci_range.vpi_bits)
	p = 0;
	}
	} while (old_p != p \|\| old_c != c);
	return -EADDRINUSE;
	}

	static int __vcc_connect(struct atm_vcc vcc, struct atm_dev dev, short vpi,
	int vci)
	{
	struct sock *sk = sk_atm(vcc);
	int error;

	if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
	vpi >> dev->ci_range.vpi_bits) \|\| (vci != ATM_VCI_UNSPEC &&
	vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
	return -EINVAL;
	if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
	return -EPERM;
	error = -ENODEV;
	if (!try_module_get(dev->ops->owner))
	return error;
	vcc->dev = dev;
	write_lock_irq(&vcc_sklist_lock);
	if (test_bit(ATM_DF_REMOVED, &dev->flags) \|\|
	(error = find_ci(vcc, &vpi, &vci))) {
	write_unlock_irq(&vcc_sklist_lock);
	goto fail_module_put;
	}
	vcc->vpi = vpi;
	vcc->vci = vci;
	__vcc_insert_socket(sk);
	write_unlock_irq(&vcc_sklist_lock);
	switch (vcc->qos.aal) {
	case ATM_AAL0:
	error = atm_init_aal0(vcc);
	vcc->stats = &dev->stats.aal0;
	break;
	case ATM_AAL34:
	error = atm_init_aal34(vcc);
	vcc->stats = &dev->stats.aal34;
	break;
	case ATM_NO_AAL:
	/* ATM_AAL5 is also used in the "0 for default" case */
	vcc->qos.aal = ATM_AAL5;
	/* fall through */
	case ATM_AAL5:
	error = atm_init_aal5(vcc);
	vcc->stats = &dev->stats.aal5;
	break;
	default:
	error = -EPROTOTYPE;
	}
	if (!error)
	error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
	if (!error)
	error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
	if (error)
	goto fail;
	pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
	pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
	vcc->qos.txtp.traffic_class,
	vcc->qos.txtp.min_pcr,
	vcc->qos.txtp.max_pcr,
	vcc->qos.txtp.max_sdu);
	pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
	vcc->qos.rxtp.traffic_class,
	vcc->qos.rxtp.min_pcr,
	vcc->qos.rxtp.max_pcr,
	vcc->qos.rxtp.max_sdu);

	if (dev->ops->open) {
	error = dev->ops->open(vcc);
	if (error)
	goto fail;
	}
	return 0;

	fail:
	vcc_remove_socket(sk);
	fail_module_put:
	module_put(dev->ops->owner);
	/* ensure we get dev module ref count correct */
	vcc->dev = NULL;
	return error;
	}

	int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
	{
	struct atm_dev *dev;
	struct atm_vcc *vcc = ATM_SD(sock);
	int error;

	pr_debug("(vpi %d, vci %d)\n", vpi, vci);
	if (sock->state == SS_CONNECTED)
	return -EISCONN;
	if (sock->state != SS_UNCONNECTED)
	return -EINVAL;
	if (!(vpi \|\| vci))
	return -EINVAL;

	if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
	clear_bit(ATM_VF_PARTIAL, &vcc->flags);
	else
	if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
	return -EINVAL;
	pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
	"RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
	vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
	vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
	vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
	vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
	vcc->qos.aal == ATM_AAL5 ? "" :
	vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
	vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
	if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
	return -EBADFD;
	if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS \|\|
	vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
	return -EINVAL;
	if (likely(itf != ATM_ITF_ANY)) {
	dev = try_then_request_module(atm_dev_lookup(itf),
	"atm-device-%d", itf);
	} else {
	dev = NULL;
	mutex_lock(&atm_dev_mutex);
	if (!list_empty(&atm_devs)) {
	dev = list_entry(atm_devs.next,
	struct atm_dev, dev_list);
	atm_dev_hold(dev);
	}
	mutex_unlock(&atm_dev_mutex);
	}
	if (!dev)
	return -ENODEV;
	error = __vcc_connect(vcc, dev, vpi, vci);
	if (error) {
	atm_dev_put(dev);
	return error;
	}
	if (vpi == ATM_VPI_UNSPEC \|\| vci == ATM_VCI_UNSPEC)
	set_bit(ATM_VF_PARTIAL, &vcc->flags);
	if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
	sock->state = SS_CONNECTED;
	return 0;
	}

	int vcc_recvmsg(struct kiocb iocb, struct socket sock, struct msghdr *msg,
	size_t size, int flags)
	{
	struct sock *sk = sock->sk;
	struct atm_vcc *vcc;
	struct sk_buff *skb;
	int copied, error = -EINVAL;

	if (sock->state != SS_CONNECTED)
	return -ENOTCONN;
	if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
	return -EOPNOTSUPP;
	vcc = ATM_SD(sock);
	if (test_bit(ATM_VF_RELEASED, &vcc->flags) \|\|
	test_bit(ATM_VF_CLOSE, &vcc->flags) \|\|
	!test_bit(ATM_VF_READY, &vcc->flags))
	return 0;

	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
	if (!skb)
	return error;

	copied = skb->len;
	if (copied > size) {
	copied = size;
	msg->msg_flags \|= MSG_TRUNC;
	}

	error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (error)
	return error;
	sock_recv_ts_and_drops(msg, sk, skb);
	pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize);
	atm_return(vcc, skb->truesize);
	skb_free_datagram(sk, skb);
	return copied;
	}

	int vcc_sendmsg(struct kiocb iocb, struct socket sock, struct msghdr *m,
	size_t total_len)
	{
	struct sock *sk = sock->sk;
	DEFINE_WAIT(wait);
	struct atm_vcc *vcc;
	struct sk_buff *skb;
	int eff, error;
	const void __user *buff;
	int size;

	lock_sock(sk);
	if (sock->state != SS_CONNECTED) {
	error = -ENOTCONN;
	goto out;
	}
	if (m->msg_name) {
	error = -EISCONN;
	goto out;
	}
	if (m->msg_iovlen != 1) {
	error = -ENOSYS; /* fix this later @@@ */
	goto out;
	}
	buff = m->msg_iov->iov_base;
	size = m->msg_iov->iov_len;
	vcc = ATM_SD(sock);
	if (test_bit(ATM_VF_RELEASED, &vcc->flags) \|\|
	test_bit(ATM_VF_CLOSE, &vcc->flags) \|\|
	!test_bit(ATM_VF_READY, &vcc->flags)) {
	error = -EPIPE;
	send_sig(SIGPIPE, current, 0);
	goto out;
	}
	if (!size) {
	error = 0;
	goto out;
	}
	if (size < 0 \|\| size > vcc->qos.txtp.max_sdu) {
	error = -EMSGSIZE;
	goto out;
	}

	eff = (size+3) & ~3; /* align to word boundary */
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
	error = 0;
	while (!(skb = alloc_tx(vcc, eff))) {
	if (m->msg_flags & MSG_DONTWAIT) {
	error = -EAGAIN;
	break;
	}
	schedule();
	if (signal_pending(current)) {
	error = -ERESTARTSYS;
	break;
	}
	if (test_bit(ATM_VF_RELEASED, &vcc->flags) \|\|
	test_bit(ATM_VF_CLOSE, &vcc->flags) \|\|
	!test_bit(ATM_VF_READY, &vcc->flags)) {
	error = -EPIPE;
	send_sig(SIGPIPE, current, 0);
	break;
	}
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
	}
	finish_wait(sk_sleep(sk), &wait);
	if (error)
	goto out;
	skb->dev = NULL; /* for paths shared with net_device interfaces */
	ATM_SKB(skb)->atm_options = vcc->atm_options;
	if (copy_from_user(skb_put(skb, size), buff, size)) {
	kfree_skb(skb);
	error = -EFAULT;
	goto out;
	}
	if (eff != size)
	memset(skb->data + size, 0, eff-size);
	error = vcc->dev->ops->send(vcc, skb);
	error = error ? error : size;
	out:
	release_sock(sk);
	return error;
	}

	unsigned int vcc_poll(struct file file, struct socket sock, poll_table *wait)
	{
	struct sock *sk = sock->sk;
	struct atm_vcc *vcc;
	unsigned int mask;

	sock_poll_wait(file, sk_sleep(sk), wait);
	mask = 0;

	vcc = ATM_SD(sock);

	/* exceptional events */
	if (sk->sk_err)
	mask = POLLERR;

	if (test_bit(ATM_VF_RELEASED, &vcc->flags) \|\|
	test_bit(ATM_VF_CLOSE, &vcc->flags))
	mask \|= POLLHUP;

	/* readable? */
	if (!skb_queue_empty(&sk->sk_receive_queue))
	mask \|= POLLIN \| POLLRDNORM;

	/* writable? */
	if (sock->state == SS_CONNECTING &&
	test_bit(ATM_VF_WAITING, &vcc->flags))
	return mask;

	if (vcc->qos.txtp.traffic_class != ATM_NONE &&
	vcc_writable(sk))
	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;

	return mask;
	}

	static int atm_change_qos(struct atm_vcc vcc, struct atm_qos qos)
	{
	int error;

	/*
	* Don't let the QoS change the already connected AAL type nor the
	* traffic class.
	*/
	if (qos->aal != vcc->qos.aal \|\|
	qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class \|\|
	qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
	return -EINVAL;
	error = adjust_tp(&qos->txtp, qos->aal);
	if (!error)
	error = adjust_tp(&qos->rxtp, qos->aal);
	if (error)
	return error;
	if (!vcc->dev->ops->change_qos)
	return -EOPNOTSUPP;
	if (sk_atm(vcc)->sk_family == AF_ATMPVC)
	return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
	return svc_change_qos(vcc, qos);
	}

	static int check_tp(const struct atm_trafprm *tp)
	{
	/* @@@ Should be merged with adjust_tp */
	if (!tp->traffic_class \|\| tp->traffic_class == ATM_ANYCLASS)
	return 0;
	if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
	!tp->max_pcr)
	return -EINVAL;
	if (tp->min_pcr == ATM_MAX_PCR)
	return -EINVAL;
	if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
	tp->min_pcr > tp->max_pcr)
	return -EINVAL;
	/*
	* We allow pcr to be outside [min_pcr,max_pcr], because later
	* adjustment may still push it in the valid range.
	*/
	return 0;
	}

	static int check_qos(const struct atm_qos *qos)
	{
	int error;

	if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
	return -EINVAL;
	if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
	qos->txtp.traffic_class && qos->rxtp.traffic_class &&
	qos->txtp.traffic_class != ATM_ANYCLASS &&
	qos->rxtp.traffic_class != ATM_ANYCLASS)
	return -EINVAL;
	error = check_tp(&qos->txtp);
	if (error)
	return error;
	return check_tp(&qos->rxtp);
	}

	int vcc_setsockopt(struct socket *sock, int level, int optname,
	char __user *optval, unsigned int optlen)
	{
	struct atm_vcc *vcc;
	unsigned long value;
	int error;

	if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
	return -EINVAL;

	vcc = ATM_SD(sock);
	switch (optname) {
	case SO_ATMQOS:
	{
	struct atm_qos qos;

	if (copy_from_user(&qos, optval, sizeof(qos)))
	return -EFAULT;
	error = check_qos(&qos);
	if (error)
	return error;
	if (sock->state == SS_CONNECTED)
	return atm_change_qos(vcc, &qos);
	if (sock->state != SS_UNCONNECTED)
	return -EBADFD;
	vcc->qos = qos;
	set_bit(ATM_VF_HASQOS, &vcc->flags);
	return 0;
	}
	case SO_SETCLP:
	if (get_user(value, (unsigned long __user *)optval))
	return -EFAULT;
	if (value)
	vcc->atm_options \|= ATM_ATMOPT_CLP;
	else
	vcc->atm_options &= ~ATM_ATMOPT_CLP;
	return 0;
	default:
	if (level == SOL_SOCKET)
	return -EINVAL;
	break;
	}
	if (!vcc->dev \|\| !vcc->dev->ops->setsockopt)
	return -EINVAL;
	return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
	}

	int vcc_getsockopt(struct socket *sock, int level, int optname,
	char __user optval, int __user optlen)
	{
	struct atm_vcc *vcc;
	int len;

	if (get_user(len, optlen))
	return -EFAULT;
	if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
	return -EINVAL;

	vcc = ATM_SD(sock);
	switch (optname) {
	case SO_ATMQOS:
	if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
	return -EINVAL;
	return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
	? -EFAULT : 0;
	case SO_SETCLP:
	return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
	(unsigned long __user *)optval) ? -EFAULT : 0;
	case SO_ATMPVC:
	{
	struct sockaddr_atmpvc pvc;

	if (!vcc->dev \|\| !test_bit(ATM_VF_ADDR, &vcc->flags))
	return -ENOTCONN;
	pvc.sap_family = AF_ATMPVC;
	pvc.sap_addr.itf = vcc->dev->number;
	pvc.sap_addr.vpi = vcc->vpi;
	pvc.sap_addr.vci = vcc->vci;
	return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
	}
	default:
	if (level == SOL_SOCKET)
	return -EINVAL;
	break;
	}
	if (!vcc->dev \|\| !vcc->dev->ops->getsockopt)
	return -EINVAL;
	return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
	}

	int register_atmdevice_notifier(struct notifier_block *nb)
	{
	return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
	}
	EXPORT_SYMBOL_GPL(register_atmdevice_notifier);

	void unregister_atmdevice_notifier(struct notifier_block *nb)
	{
	atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
	}
	EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);

	static int __init atm_init(void)
	{
	int error;

	error = proto_register(&vcc_proto, 0);
	if (error < 0)
	goto out;
	error = atmpvc_init();
	if (error < 0) {
	pr_err("atmpvc_init() failed with %d\n", error);
	goto out_unregister_vcc_proto;
	}
	error = atmsvc_init();
	if (error < 0) {
	pr_err("atmsvc_init() failed with %d\n", error);
	goto out_atmpvc_exit;
	}
	error = atm_proc_init();
	if (error < 0) {
	pr_err("atm_proc_init() failed with %d\n", error);
	goto out_atmsvc_exit;
	}
	error = atm_sysfs_init();
	if (error < 0) {
	pr_err("atm_sysfs_init() failed with %d\n", error);
	goto out_atmproc_exit;
	}
	out:
	return error;
	out_atmproc_exit:
	atm_proc_exit();
	out_atmsvc_exit:
	atmsvc_exit();
	out_atmpvc_exit:
	atmsvc_exit();
	out_unregister_vcc_proto:
	proto_unregister(&vcc_proto);
	goto out;
	}

	static void __exit atm_exit(void)
	{
	atm_proc_exit();
	atm_sysfs_exit();
	atmsvc_exit();
	atmpvc_exit();
	proto_unregister(&vcc_proto);
	}

	subsys_initcall(atm_init);

	module_exit(atm_exit);

	MODULE_LICENSE("GPL");
	MODULE_ALIAS_NETPROTO(PF_ATMPVC);
	MODULE_ALIAS_NETPROTO(PF_ATMSVC);