v4.19.13 snapshot.
diff --git a/net/atm/resources.c b/net/atm/resources.c
new file mode 100644
index 0000000..bada395
--- /dev/null
+++ b/net/atm/resources.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0
+/* net/atm/resources.c - Statically allocated resources */
+
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+
+/* Fixes
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * 2002/01 - don't free the whole struct sock on sk->destruct time,
+ * use the default destruct function initialized by sock_init_data */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/atmdev.h>
+#include <linux/sonet.h>
+#include <linux/kernel.h> /* for barrier */
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/capability.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <net/sock.h> /* for struct sock */
+
+#include "common.h"
+#include "resources.h"
+#include "addr.h"
+
+
+LIST_HEAD(atm_devs);
+DEFINE_MUTEX(atm_dev_mutex);
+
+static struct atm_dev *__alloc_atm_dev(const char *type)
+{
+ struct atm_dev *dev;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+ dev->type = type;
+ dev->signal = ATM_PHY_SIG_UNKNOWN;
+ dev->link_rate = ATM_OC3_PCR;
+ spin_lock_init(&dev->lock);
+ INIT_LIST_HEAD(&dev->local);
+ INIT_LIST_HEAD(&dev->lecs);
+
+ return dev;
+}
+
+static struct atm_dev *__atm_dev_lookup(int number)
+{
+ struct atm_dev *dev;
+ struct list_head *p;
+
+ list_for_each(p, &atm_devs) {
+ dev = list_entry(p, struct atm_dev, dev_list);
+ if (dev->number == number) {
+ atm_dev_hold(dev);
+ return dev;
+ }
+ }
+ return NULL;
+}
+
+struct atm_dev *atm_dev_lookup(int number)
+{
+ struct atm_dev *dev;
+
+ mutex_lock(&atm_dev_mutex);
+ dev = __atm_dev_lookup(number);
+ mutex_unlock(&atm_dev_mutex);
+ return dev;
+}
+EXPORT_SYMBOL(atm_dev_lookup);
+
+struct atm_dev *atm_dev_register(const char *type, struct device *parent,
+ const struct atmdev_ops *ops, int number,
+ unsigned long *flags)
+{
+ struct atm_dev *dev, *inuse;
+
+ dev = __alloc_atm_dev(type);
+ if (!dev) {
+ pr_err("no space for dev %s\n", type);
+ return NULL;
+ }
+ mutex_lock(&atm_dev_mutex);
+ if (number != -1) {
+ inuse = __atm_dev_lookup(number);
+ if (inuse) {
+ atm_dev_put(inuse);
+ mutex_unlock(&atm_dev_mutex);
+ kfree(dev);
+ return NULL;
+ }
+ dev->number = number;
+ } else {
+ dev->number = 0;
+ while ((inuse = __atm_dev_lookup(dev->number))) {
+ atm_dev_put(inuse);
+ dev->number++;
+ }
+ }
+
+ dev->ops = ops;
+ if (flags)
+ dev->flags = *flags;
+ else
+ memset(&dev->flags, 0, sizeof(dev->flags));
+ memset(&dev->stats, 0, sizeof(dev->stats));
+ refcount_set(&dev->refcnt, 1);
+
+ if (atm_proc_dev_register(dev) < 0) {
+ pr_err("atm_proc_dev_register failed for dev %s\n", type);
+ goto out_fail;
+ }
+
+ if (atm_register_sysfs(dev, parent) < 0) {
+ pr_err("atm_register_sysfs failed for dev %s\n", type);
+ atm_proc_dev_deregister(dev);
+ goto out_fail;
+ }
+
+ list_add_tail(&dev->dev_list, &atm_devs);
+
+out:
+ mutex_unlock(&atm_dev_mutex);
+ return dev;
+
+out_fail:
+ kfree(dev);
+ dev = NULL;
+ goto out;
+}
+EXPORT_SYMBOL(atm_dev_register);
+
+void atm_dev_deregister(struct atm_dev *dev)
+{
+ BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
+ set_bit(ATM_DF_REMOVED, &dev->flags);
+
+ /*
+ * if we remove current device from atm_devs list, new device
+ * with same number can appear, such we need deregister proc,
+ * release async all vccs and remove them from vccs list too
+ */
+ mutex_lock(&atm_dev_mutex);
+ list_del(&dev->dev_list);
+ mutex_unlock(&atm_dev_mutex);
+
+ atm_dev_release_vccs(dev);
+ atm_unregister_sysfs(dev);
+ atm_proc_dev_deregister(dev);
+
+ atm_dev_put(dev);
+}
+EXPORT_SYMBOL(atm_dev_deregister);
+
+static void copy_aal_stats(struct k_atm_aal_stats *from,
+ struct atm_aal_stats *to)
+{
+#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
+ __AAL_STAT_ITEMS
+#undef __HANDLE_ITEM
+}
+
+static void subtract_aal_stats(struct k_atm_aal_stats *from,
+ struct atm_aal_stats *to)
+{
+#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
+ __AAL_STAT_ITEMS
+#undef __HANDLE_ITEM
+}
+
+static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
+ int zero)
+{
+ struct atm_dev_stats tmp;
+ int error = 0;
+
+ copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
+ copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
+ copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
+ if (arg)
+ error = copy_to_user(arg, &tmp, sizeof(tmp));
+ if (zero && !error) {
+ subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
+ subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
+ subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
+ }
+ return error ? -EFAULT : 0;
+}
+
+int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
+{
+ void __user *buf;
+ int error, len, number, size = 0;
+ struct atm_dev *dev;
+ struct list_head *p;
+ int *tmp_buf, *tmp_p;
+ int __user *sioc_len;
+ int __user *iobuf_len;
+
+#ifndef CONFIG_COMPAT
+ compat = 0; /* Just so the compiler _knows_ */
+#endif
+
+ switch (cmd) {
+ case ATM_GETNAMES:
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atm_iobuf __user *ciobuf = arg;
+ compat_uptr_t cbuf;
+ iobuf_len = &ciobuf->length;
+ if (get_user(cbuf, &ciobuf->buffer))
+ return -EFAULT;
+ buf = compat_ptr(cbuf);
+#endif
+ } else {
+ struct atm_iobuf __user *iobuf = arg;
+ iobuf_len = &iobuf->length;
+ if (get_user(buf, &iobuf->buffer))
+ return -EFAULT;
+ }
+ if (get_user(len, iobuf_len))
+ return -EFAULT;
+ mutex_lock(&atm_dev_mutex);
+ list_for_each(p, &atm_devs)
+ size += sizeof(int);
+ if (size > len) {
+ mutex_unlock(&atm_dev_mutex);
+ return -E2BIG;
+ }
+ tmp_buf = kmalloc(size, GFP_ATOMIC);
+ if (!tmp_buf) {
+ mutex_unlock(&atm_dev_mutex);
+ return -ENOMEM;
+ }
+ tmp_p = tmp_buf;
+ list_for_each(p, &atm_devs) {
+ dev = list_entry(p, struct atm_dev, dev_list);
+ *tmp_p++ = dev->number;
+ }
+ mutex_unlock(&atm_dev_mutex);
+ error = ((copy_to_user(buf, tmp_buf, size)) ||
+ put_user(size, iobuf_len))
+ ? -EFAULT : 0;
+ kfree(tmp_buf);
+ return error;
+ default:
+ break;
+ }
+
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atmif_sioc __user *csioc = arg;
+ compat_uptr_t carg;
+
+ sioc_len = &csioc->length;
+ if (get_user(carg, &csioc->arg))
+ return -EFAULT;
+ buf = compat_ptr(carg);
+
+ if (get_user(len, &csioc->length))
+ return -EFAULT;
+ if (get_user(number, &csioc->number))
+ return -EFAULT;
+#endif
+ } else {
+ struct atmif_sioc __user *sioc = arg;
+
+ sioc_len = &sioc->length;
+ if (get_user(buf, &sioc->arg))
+ return -EFAULT;
+ if (get_user(len, &sioc->length))
+ return -EFAULT;
+ if (get_user(number, &sioc->number))
+ return -EFAULT;
+ }
+
+ dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
+ number);
+ if (!dev)
+ return -ENODEV;
+
+ switch (cmd) {
+ case ATM_GETTYPE:
+ size = strlen(dev->type) + 1;
+ if (copy_to_user(buf, dev->type, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_GETESI:
+ size = ESI_LEN;
+ if (copy_to_user(buf, dev->esi, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_SETESI:
+ {
+ int i;
+
+ for (i = 0; i < ESI_LEN; i++)
+ if (dev->esi[i]) {
+ error = -EEXIST;
+ goto done;
+ }
+ }
+ /* fall through */
+ case ATM_SETESIF:
+ {
+ unsigned char esi[ESI_LEN];
+
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ if (copy_from_user(esi, buf, ESI_LEN)) {
+ error = -EFAULT;
+ goto done;
+ }
+ memcpy(dev->esi, esi, ESI_LEN);
+ error = ESI_LEN;
+ goto done;
+ }
+ case ATM_GETSTATZ:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ /* fall through */
+ case ATM_GETSTAT:
+ size = sizeof(struct atm_dev_stats);
+ error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
+ if (error)
+ goto done;
+ break;
+ case ATM_GETCIRANGE:
+ size = sizeof(struct atm_cirange);
+ if (copy_to_user(buf, &dev->ci_range, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_GETLINKRATE:
+ size = sizeof(int);
+ if (copy_to_user(buf, &dev->link_rate, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_RSTADDR:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ atm_reset_addr(dev, ATM_ADDR_LOCAL);
+ break;
+ case ATM_ADDADDR:
+ case ATM_DELADDR:
+ case ATM_ADDLECSADDR:
+ case ATM_DELLECSADDR:
+ {
+ struct sockaddr_atmsvc addr;
+
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+
+ if (copy_from_user(&addr, buf, sizeof(addr))) {
+ error = -EFAULT;
+ goto done;
+ }
+ if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
+ error = atm_add_addr(dev, &addr,
+ (cmd == ATM_ADDADDR ?
+ ATM_ADDR_LOCAL : ATM_ADDR_LECS));
+ else
+ error = atm_del_addr(dev, &addr,
+ (cmd == ATM_DELADDR ?
+ ATM_ADDR_LOCAL : ATM_ADDR_LECS));
+ goto done;
+ }
+ case ATM_GETADDR:
+ case ATM_GETLECSADDR:
+ error = atm_get_addr(dev, buf, len,
+ (cmd == ATM_GETADDR ?
+ ATM_ADDR_LOCAL : ATM_ADDR_LECS));
+ if (error < 0)
+ goto done;
+ size = error;
+ /* may return 0, but later on size == 0 means "don't
+ write the length" */
+ error = put_user(size, sioc_len) ? -EFAULT : 0;
+ goto done;
+ case ATM_SETLOOP:
+ if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
+ __ATM_LM_XTLOC((int) (unsigned long) buf) >
+ __ATM_LM_XTRMT((int) (unsigned long) buf)) {
+ error = -EINVAL;
+ goto done;
+ }
+ /* fall through */
+ case ATM_SETCIRANGE:
+ case SONET_GETSTATZ:
+ case SONET_SETDIAG:
+ case SONET_CLRDIAG:
+ case SONET_SETFRAMING:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ /* fall through */
+ default:
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ if (!dev->ops->compat_ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->compat_ioctl(dev, cmd, buf);
+#endif
+ } else {
+ if (!dev->ops->ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->ioctl(dev, cmd, buf);
+ }
+ if (size < 0) {
+ error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
+ goto done;
+ }
+ }
+
+ if (size)
+ error = put_user(size, sioc_len) ? -EFAULT : 0;
+ else
+ error = 0;
+done:
+ atm_dev_put(dev);
+ return error;
+}
+
+void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ mutex_lock(&atm_dev_mutex);
+ return seq_list_start_head(&atm_devs, *pos);
+}
+
+void atm_dev_seq_stop(struct seq_file *seq, void *v)
+{
+ mutex_unlock(&atm_dev_mutex);
+}
+
+void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &atm_devs, pos);
+}