Loading...
1/*
2 * cfg80211 debugfs
3 *
4 * Copyright 2009 Luis R. Rodriguez <lrodriguez@atheros.com>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/slab.h>
13#include "core.h"
14#include "debugfs.h"
15
16#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
17static ssize_t name## _read(struct file *file, char __user *userbuf, \
18 size_t count, loff_t *ppos) \
19{ \
20 struct wiphy *wiphy= file->private_data; \
21 char buf[buflen]; \
22 int res; \
23 \
24 res = scnprintf(buf, buflen, fmt "\n", ##value); \
25 return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
26} \
27 \
28static const struct file_operations name## _ops = { \
29 .read = name## _read, \
30 .open = simple_open, \
31 .llseek = generic_file_llseek, \
32};
33
34DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
35 wiphy->rts_threshold)
36DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
37 wiphy->frag_threshold);
38DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
39 wiphy->retry_short)
40DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
41 wiphy->retry_long);
42
43static int ht_print_chan(struct ieee80211_channel *chan,
44 char *buf, int buf_size, int offset)
45{
46 if (WARN_ON(offset > buf_size))
47 return 0;
48
49 if (chan->flags & IEEE80211_CHAN_DISABLED)
50 return scnprintf(buf + offset,
51 buf_size - offset,
52 "%d Disabled\n",
53 chan->center_freq);
54
55 return scnprintf(buf + offset,
56 buf_size - offset,
57 "%d HT40 %c%c\n",
58 chan->center_freq,
59 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ?
60 ' ' : '-',
61 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ?
62 ' ' : '+');
63}
64
65static ssize_t ht40allow_map_read(struct file *file,
66 char __user *user_buf,
67 size_t count, loff_t *ppos)
68{
69 struct wiphy *wiphy = file->private_data;
70 char *buf;
71 unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
72 enum nl80211_band band;
73 struct ieee80211_supported_band *sband;
74
75 buf = kzalloc(buf_size, GFP_KERNEL);
76 if (!buf)
77 return -ENOMEM;
78
79 rtnl_lock();
80
81 for (band = 0; band < NUM_NL80211_BANDS; band++) {
82 sband = wiphy->bands[band];
83 if (!sband)
84 continue;
85 for (i = 0; i < sband->n_channels; i++)
86 offset += ht_print_chan(&sband->channels[i],
87 buf, buf_size, offset);
88 }
89
90 rtnl_unlock();
91
92 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
93
94 kfree(buf);
95
96 return r;
97}
98
99static const struct file_operations ht40allow_map_ops = {
100 .read = ht40allow_map_read,
101 .open = simple_open,
102 .llseek = default_llseek,
103};
104
105#define DEBUGFS_ADD(name) \
106 debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
107
108void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
109{
110 struct dentry *phyd = rdev->wiphy.debugfsdir;
111
112 DEBUGFS_ADD(rts_threshold);
113 DEBUGFS_ADD(fragmentation_threshold);
114 DEBUGFS_ADD(short_retry_limit);
115 DEBUGFS_ADD(long_retry_limit);
116 DEBUGFS_ADD(ht40allow_map);
117}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cfg80211 debugfs
4 *
5 * Copyright 2009 Luis R. Rodriguez <lrodriguez@atheros.com>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright (C) 2023 Intel Corporation
8 */
9
10#include <linux/slab.h>
11#include "core.h"
12#include "debugfs.h"
13
14#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
15static ssize_t name## _read(struct file *file, char __user *userbuf, \
16 size_t count, loff_t *ppos) \
17{ \
18 struct wiphy *wiphy = file->private_data; \
19 char buf[buflen]; \
20 int res; \
21 \
22 res = scnprintf(buf, buflen, fmt "\n", ##value); \
23 return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
24} \
25 \
26static const struct file_operations name## _ops = { \
27 .read = name## _read, \
28 .open = simple_open, \
29 .llseek = generic_file_llseek, \
30}
31
32DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
33 wiphy->rts_threshold);
34DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
35 wiphy->frag_threshold);
36DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
37 wiphy->retry_short);
38DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
39 wiphy->retry_long);
40
41static int ht_print_chan(struct ieee80211_channel *chan,
42 char *buf, int buf_size, int offset)
43{
44 if (WARN_ON(offset > buf_size))
45 return 0;
46
47 if (chan->flags & IEEE80211_CHAN_DISABLED)
48 return scnprintf(buf + offset,
49 buf_size - offset,
50 "%d Disabled\n",
51 chan->center_freq);
52
53 return scnprintf(buf + offset,
54 buf_size - offset,
55 "%d HT40 %c%c\n",
56 chan->center_freq,
57 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ?
58 ' ' : '-',
59 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ?
60 ' ' : '+');
61}
62
63static ssize_t ht40allow_map_read(struct file *file,
64 char __user *user_buf,
65 size_t count, loff_t *ppos)
66{
67 struct wiphy *wiphy = file->private_data;
68 char *buf;
69 unsigned int offset = 0, buf_size = PAGE_SIZE, i;
70 enum nl80211_band band;
71 struct ieee80211_supported_band *sband;
72 ssize_t r;
73
74 buf = kzalloc(buf_size, GFP_KERNEL);
75 if (!buf)
76 return -ENOMEM;
77
78 for (band = 0; band < NUM_NL80211_BANDS; band++) {
79 sband = wiphy->bands[band];
80 if (!sband)
81 continue;
82 for (i = 0; i < sband->n_channels; i++)
83 offset += ht_print_chan(&sband->channels[i],
84 buf, buf_size, offset);
85 }
86
87 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
88
89 kfree(buf);
90
91 return r;
92}
93
94static const struct file_operations ht40allow_map_ops = {
95 .read = ht40allow_map_read,
96 .open = simple_open,
97 .llseek = default_llseek,
98};
99
100#define DEBUGFS_ADD(name) \
101 debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops)
102
103void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
104{
105 struct dentry *phyd = rdev->wiphy.debugfsdir;
106
107 DEBUGFS_ADD(rts_threshold);
108 DEBUGFS_ADD(fragmentation_threshold);
109 DEBUGFS_ADD(short_retry_limit);
110 DEBUGFS_ADD(long_retry_limit);
111 DEBUGFS_ADD(ht40allow_map);
112}
113
114struct debugfs_read_work {
115 struct wiphy_work work;
116 ssize_t (*handler)(struct wiphy *wiphy,
117 struct file *file,
118 char *buf,
119 size_t count,
120 void *data);
121 struct wiphy *wiphy;
122 struct file *file;
123 char *buf;
124 size_t bufsize;
125 void *data;
126 ssize_t ret;
127 struct completion completion;
128};
129
130static void wiphy_locked_debugfs_read_work(struct wiphy *wiphy,
131 struct wiphy_work *work)
132{
133 struct debugfs_read_work *w = container_of(work, typeof(*w), work);
134
135 w->ret = w->handler(w->wiphy, w->file, w->buf, w->bufsize, w->data);
136 complete(&w->completion);
137}
138
139static void wiphy_locked_debugfs_read_cancel(struct dentry *dentry,
140 void *data)
141{
142 struct debugfs_read_work *w = data;
143
144 wiphy_work_cancel(w->wiphy, &w->work);
145 complete(&w->completion);
146}
147
148ssize_t wiphy_locked_debugfs_read(struct wiphy *wiphy, struct file *file,
149 char *buf, size_t bufsize,
150 char __user *userbuf, size_t count,
151 loff_t *ppos,
152 ssize_t (*handler)(struct wiphy *wiphy,
153 struct file *file,
154 char *buf,
155 size_t bufsize,
156 void *data),
157 void *data)
158{
159 struct debugfs_read_work work = {
160 .handler = handler,
161 .wiphy = wiphy,
162 .file = file,
163 .buf = buf,
164 .bufsize = bufsize,
165 .data = data,
166 .ret = -ENODEV,
167 .completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
168 };
169 struct debugfs_cancellation cancellation = {
170 .cancel = wiphy_locked_debugfs_read_cancel,
171 .cancel_data = &work,
172 };
173
174 /* don't leak stack data or whatever */
175 memset(buf, 0, bufsize);
176
177 wiphy_work_init(&work.work, wiphy_locked_debugfs_read_work);
178 wiphy_work_queue(wiphy, &work.work);
179
180 debugfs_enter_cancellation(file, &cancellation);
181 wait_for_completion(&work.completion);
182 debugfs_leave_cancellation(file, &cancellation);
183
184 if (work.ret < 0)
185 return work.ret;
186
187 if (WARN_ON(work.ret > bufsize))
188 return -EINVAL;
189
190 return simple_read_from_buffer(userbuf, count, ppos, buf, work.ret);
191}
192EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_read);
193
194struct debugfs_write_work {
195 struct wiphy_work work;
196 ssize_t (*handler)(struct wiphy *wiphy,
197 struct file *file,
198 char *buf,
199 size_t count,
200 void *data);
201 struct wiphy *wiphy;
202 struct file *file;
203 char *buf;
204 size_t count;
205 void *data;
206 ssize_t ret;
207 struct completion completion;
208};
209
210static void wiphy_locked_debugfs_write_work(struct wiphy *wiphy,
211 struct wiphy_work *work)
212{
213 struct debugfs_write_work *w = container_of(work, typeof(*w), work);
214
215 w->ret = w->handler(w->wiphy, w->file, w->buf, w->count, w->data);
216 complete(&w->completion);
217}
218
219static void wiphy_locked_debugfs_write_cancel(struct dentry *dentry,
220 void *data)
221{
222 struct debugfs_write_work *w = data;
223
224 wiphy_work_cancel(w->wiphy, &w->work);
225 complete(&w->completion);
226}
227
228ssize_t wiphy_locked_debugfs_write(struct wiphy *wiphy,
229 struct file *file, char *buf, size_t bufsize,
230 const char __user *userbuf, size_t count,
231 ssize_t (*handler)(struct wiphy *wiphy,
232 struct file *file,
233 char *buf,
234 size_t count,
235 void *data),
236 void *data)
237{
238 struct debugfs_write_work work = {
239 .handler = handler,
240 .wiphy = wiphy,
241 .file = file,
242 .buf = buf,
243 .count = count,
244 .data = data,
245 .ret = -ENODEV,
246 .completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
247 };
248 struct debugfs_cancellation cancellation = {
249 .cancel = wiphy_locked_debugfs_write_cancel,
250 .cancel_data = &work,
251 };
252
253 /* mostly used for strings so enforce NUL-termination for safety */
254 if (count >= bufsize)
255 return -EINVAL;
256
257 memset(buf, 0, bufsize);
258
259 if (copy_from_user(buf, userbuf, count))
260 return -EFAULT;
261
262 wiphy_work_init(&work.work, wiphy_locked_debugfs_write_work);
263 wiphy_work_queue(wiphy, &work.work);
264
265 debugfs_enter_cancellation(file, &cancellation);
266 wait_for_completion(&work.completion);
267 debugfs_leave_cancellation(file, &cancellation);
268
269 return work.ret;
270}
271EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_write);