v4.19.13 snapshot.
diff --git a/net/atm/common.c b/net/atm/common.c
new file mode 100644
index 0000000..a38c174
--- /dev/null
+++ b/net/atm/common.c
@@ -0,0 +1,904 @@
+/* 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) {
+ if (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);
+ }
+
+ 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);
+ /* 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 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;
+ /* 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 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, 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_msg(skb, 0, msg, copied);
+ if (error)
+ return error;
+ sock_recv_ts_and_drops(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(&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,
+ 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;
+ 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:
+ 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);