1 files changed, 895 insertions, 0 deletions

diff --git a/net/atm/common.c b/net/atm/common.c
new file mode 100644
index 000000000..f7019df41
--- /dev/null
+++ b/net/atm/common.c
@@ -0,0 +1,895 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* 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/signal.h>
+#include <linux/time64.h>	/* 64-bit time for seconds */
+#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 bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
+{
+	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 false;
+	}
+	return true;
+}
+
+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 (refcount_read(&sk->sk_wmem_alloc))
+		printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
+		       __func__, refcount_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 (skwq_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 +
+		refcount_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 (skwq_has_sleeper(wq))
+			wake_up_interruptible(&wq->wait);
+
+		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+	}
+
+	rcu_read_unlock();
+}
+
+static void vcc_release_cb(struct sock *sk)
+{
+	struct atm_vcc *vcc = atm_sk(sk);
+
+	if (vcc->release_cb)
+		vcc->release_cb(vcc);
+}
+
+static struct proto vcc_proto = {
+	.name	  = "VCC",
+	.owner	  = THIS_MODULE,
+	.obj_size = sizeof(struct atm_vcc),
+	.release_cb = vcc_release_cb,
+};
+
+int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
+{
+	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, kern);
+	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 */
+	refcount_set(&sk->sk_wmem_alloc, 1);
+	atomic_set(&sk->sk_rmem_alloc, 0);
+	vcc->push = NULL;
+	vcc->pop = NULL;
+	vcc->owner = NULL;
+	vcc->push_oam = NULL;
+	vcc->release_cb = 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 && vcc->dev->ops->close)
+		vcc->dev->ops->close(vcc);
+	if (vcc->push)
+		vcc->push(vcc, NULL); /* atmarpd has no push */
+	module_put(vcc->owner);
+
+	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+		atm_return(vcc, skb->truesize);
+		kfree_skb(skb);
+	}
+
+	if (vcc->dev && vcc->dev->ops->owner) {
+		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 vcc_process_recv_queue(struct atm_vcc *vcc)
+{
+	struct sk_buff_head queue, *rq;
+	struct sk_buff *skb, *tmp;
+	unsigned long flags;
+
+	__skb_queue_head_init(&queue);
+	rq = &sk_atm(vcc)->sk_receive_queue;
+
+	spin_lock_irqsave(&rq->lock, flags);
+	skb_queue_splice_init(rq, &queue);
+	spin_unlock_irqrestore(&rq->lock, flags);
+
+	skb_queue_walk_safe(&queue, skb, tmp) {
+		__skb_unlink(skb, &queue);
+		vcc->push(vcc, skb);
+	}
+}
+EXPORT_SYMBOL(vcc_process_recv_queue);
+
+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 *tmp;
+		struct sock *s;
+		struct atm_vcc *vcc;
+
+		sk_for_each_safe(s, 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_warn("AAL problems ... (%d)\n", aal);
+		fallthrough;
+	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 sock *s;
+	struct atm_vcc *walk;
+
+	sk_for_each(s, 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;
+		fallthrough;
+	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 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;
+
+	/* only handle MSG_DONTWAIT and MSG_PEEK */
+	if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
+		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, &error);
+	if (!skb)
+		return error;
+
+	copied = skb->len;
+	if (copied > size) {
+		copied = size;
+		msg->msg_flags |= MSG_TRUNC;
+	}
+
+	error = skb_copy_datagram_msg(skb, 0, msg, copied);
+	if (error)
+		return error;
+	sock_recv_cmsgs(msg, sk, skb);
+
+	if (!(flags & MSG_PEEK)) {
+		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 socket *sock, struct msghdr *m, size_t size)
+{
+	struct sock *sk = sock->sk;
+	DEFINE_WAIT(wait);
+	struct atm_vcc *vcc;
+	struct sk_buff *skb;
+	int eff, error;
+
+	lock_sock(sk);
+	if (sock->state != SS_CONNECTED) {
+		error = -ENOTCONN;
+		goto out;
+	}
+	if (m->msg_name) {
+		error = -EISCONN;
+		goto out;
+	}
+	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 > 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 (!vcc_tx_ready(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 = alloc_skb(eff, GFP_KERNEL);
+	if (!skb) {
+		error = -ENOMEM;
+		goto out;
+	}
+	pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
+	atm_account_tx(vcc, skb);
+
+	skb->dev = NULL; /* for paths shared with net_device interfaces */
+	if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
+		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;
+}
+
+__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
+{
+	struct sock *sk = sock->sk;
+	struct atm_vcc *vcc;
+	__poll_t mask;
+
+	sock_poll_wait(file, sock, wait);
+	mask = 0;
+
+	vcc = ATM_SD(sock);
+
+	/* exceptional events */
+	if (sk->sk_err)
+		mask = EPOLLERR;
+
+	if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
+	    test_bit(ATM_VF_CLOSE, &vcc->flags))
+		mask |= EPOLLHUP;
+
+	/* readable? */
+	if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
+		mask |= EPOLLIN | EPOLLRDNORM;
+
+	/* 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 |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
+
+	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,
+		   sockptr_t 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_sockptr(&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 (copy_from_sockptr(&value, optval, sizeof(value)))
+			return -EFAULT;
+		if (value)
+			vcc->atm_options |= ATM_ATMOPT_CLP;
+		else
+			vcc->atm_options &= ~ATM_ATMOPT_CLP;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+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;
+		memset(&pvc, 0, sizeof(pvc));
+		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:
+		return -EINVAL;
+	}
+}
+
+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);