// SPDX-License-Identifier: GPL-2.0-only
/*
* cfg80211 debugfs
*
* Copyright 2009 Luis R. Rodriguez <[email protected]>
* Copyright 2007 Johannes Berg <[email protected]>
* Copyright (C) 2023 Intel Corporation
*/
#include <linux/slab.h>
#include "core.h"
#include "debugfs.h"
#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
static ssize_t name## _read(struct file *file, char __user *userbuf, \
size_t count, loff_t *ppos) \
{ \
struct wiphy *wiphy = file->private_data; \
char buf[buflen]; \
int res; \
\
res = scnprintf(buf, buflen, fmt "\n", ##value); \
return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
} \
\
static const struct file_operations name## _ops = { \
.read = name## _read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
}
DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
wiphy->rts_threshold);
DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
wiphy->frag_threshold);
DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
wiphy->retry_short);
DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
wiphy->retry_long);
static int ht_print_chan(struct ieee80211_channel *chan,
char *buf, int buf_size, int offset)
{
if (WARN_ON(offset > buf_size))
return 0;
if (chan->flags & IEEE80211_CHAN_DISABLED)
return scnprintf(buf + offset,
buf_size - offset,
"%d Disabled\n",
chan->center_freq);
return scnprintf(buf + offset,
buf_size - offset,
"%d HT40 %c%c\n",
chan->center_freq,
(chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ?
' ' : '-',
(chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ?
' ' : '+');
}
static ssize_t ht40allow_map_read(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct wiphy *wiphy = file->private_data;
char *buf;
unsigned int offset = 0, buf_size = PAGE_SIZE, i;
enum nl80211_band band;
struct ieee80211_supported_band *sband;
ssize_t r;
buf = kzalloc(buf_size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
for (band = 0; band < NUM_NL80211_BANDS; band++) {
sband = wiphy->bands[band];
if (!sband)
continue;
for (i = 0; i < sband->n_channels; i++)
offset += ht_print_chan(&sband->channels[i],
buf, buf_size, offset);
}
r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
kfree(buf);
return r;
}
static const struct file_operations ht40allow_map_ops = {
.read = ht40allow_map_read,
.open = simple_open,
.llseek = default_llseek,
};
#define DEBUGFS_ADD(name) \
debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops)
void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
{
struct dentry *phyd = rdev->wiphy.debugfsdir;
DEBUGFS_ADD(rts_threshold);
DEBUGFS_ADD(fragmentation_threshold);
DEBUGFS_ADD(short_retry_limit);
DEBUGFS_ADD(long_retry_limit);
DEBUGFS_ADD(ht40allow_map);
}
struct debugfs_read_work {
struct wiphy_work work;
ssize_t (*handler)(struct wiphy *wiphy,
struct file *file,
char *buf,
size_t count,
void *data);
struct wiphy *wiphy;
struct file *file;
char *buf;
size_t bufsize;
void *data;
ssize_t ret;
struct completion completion;
};
static void wiphy_locked_debugfs_read_work(struct wiphy *wiphy,
struct wiphy_work *work)
{
struct debugfs_read_work *w = container_of(work, typeof(*w), work);
w->ret = w->handler(w->wiphy, w->file, w->buf, w->bufsize, w->data);
complete(&w->completion);
}
static void wiphy_locked_debugfs_read_cancel(struct dentry *dentry,
void *data)
{
struct debugfs_read_work *w = data;
wiphy_work_cancel(w->wiphy, &w->work);
complete(&w->completion);
}
ssize_t wiphy_locked_debugfs_read(struct wiphy *wiphy, struct file *file,
char *buf, size_t bufsize,
char __user *userbuf, size_t count,
loff_t *ppos,
ssize_t (*handler)(struct wiphy *wiphy,
struct file *file,
char *buf,
size_t bufsize,
void *data),
void *data)
{
struct debugfs_read_work work = {
.handler = handler,
.wiphy = wiphy,
.file = file,
.buf = buf,
.bufsize = bufsize,
.data = data,
.ret = -ENODEV,
.completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
};
struct debugfs_cancellation cancellation = {
.cancel = wiphy_locked_debugfs_read_cancel,
.cancel_data = &work,
};
/* don't leak stack data or whatever */
memset(buf, 0, bufsize);
wiphy_work_init(&work.work, wiphy_locked_debugfs_read_work);
wiphy_work_queue(wiphy, &work.work);
debugfs_enter_cancellation(file, &cancellation);
wait_for_completion(&work.completion);
debugfs_leave_cancellation(file, &cancellation);
if (work.ret < 0)
return work.ret;
if (WARN_ON(work.ret > bufsize))
return -EINVAL;
return simple_read_from_buffer(userbuf, count, ppos, buf, work.ret);
}
EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_read);
struct debugfs_write_work {
struct wiphy_work work;
ssize_t (*handler)(struct wiphy *wiphy,
struct file *file,
char *buf,
size_t count,
void *data);
struct wiphy *wiphy;
struct file *file;
char *buf;
size_t count;
void *data;
ssize_t ret;
struct completion completion;
};
static void wiphy_locked_debugfs_write_work(struct wiphy *wiphy,
struct wiphy_work *work)
{
struct debugfs_write_work *w = container_of(work, typeof(*w), work);
w->ret = w->handler(w->wiphy, w->file, w->buf, w->count, w->data);
complete(&w->completion);
}
static void wiphy_locked_debugfs_write_cancel(struct dentry *dentry,
void *data)
{
struct debugfs_write_work *w = data;
wiphy_work_cancel(w->wiphy, &w->work);
complete(&w->completion);
}
ssize_t wiphy_locked_debugfs_write(struct wiphy *wiphy,
struct file *file, char *buf, size_t bufsize,
const char __user *userbuf, size_t count,
ssize_t (*handler)(struct wiphy *wiphy,
struct file *file,
char *buf,
size_t count,
void *data),
void *data)
{
struct debugfs_write_work work = {
.handler = handler,
.wiphy = wiphy,
.file = file,
.buf = buf,
.count = count,
.data = data,
.ret = -ENODEV,
.completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
};
struct debugfs_cancellation cancellation = {
.cancel = wiphy_locked_debugfs_write_cancel,
.cancel_data = &work,
};
/* mostly used for strings so enforce NUL-termination for safety */
if (count >= bufsize)
return -EINVAL;
memset(buf, 0, bufsize);
if (copy_from_user(buf, userbuf, count))
return -EFAULT;
wiphy_work_init(&work.work, wiphy_locked_debugfs_write_work);
wiphy_work_queue(wiphy, &work.work);
debugfs_enter_cancellation(file, &cancellation);
wait_for_completion(&work.completion);
debugfs_leave_cancellation(file, &cancellation);
return work.ret;
}
EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_write);
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