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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305// SPDX-License-Identifier: GPL-2.0-only/* * cfg80211 debugfs * * Copyright 2009 Luis R. Rodriguez <lrodriguez@atheros.com> * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> * 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, \}
#define DEBUGFS_RADIO_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_radio_cfg *radio_cfg = 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);
DEBUGFS_RADIO_READONLY_FILE(radio_rts_threshold, 20, "%d", radio_cfg->rts_threshold);
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)
#define DEBUGFS_RADIO_ADD(name, radio_idx) \ debugfs_create_file(#name, 0444, radiod, \ &rdev->wiphy.radio_cfg[radio_idx], \ &name## _ops)
void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev){ struct dentry *phyd = rdev->wiphy.debugfsdir; struct dentry *radiod; u8 i;
DEBUGFS_ADD(rts_threshold); DEBUGFS_ADD(fragmentation_threshold); DEBUGFS_ADD(short_retry_limit); DEBUGFS_ADD(long_retry_limit); DEBUGFS_ADD(ht40allow_map);
for (i = 0; i < rdev->wiphy.n_radio; i++) { radiod = rdev->wiphy.radio_cfg[i].radio_debugfsdir; DEBUGFS_RADIO_ADD(radio_rts_threshold, i); }}
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);