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 */
8
9 #include <linux/slab.h>
10 #include "core.h"
11 #include "debugfs.h"
12
13 #define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
14 static ssize_t name## _read(struct file *file, char __user *userbuf, \
15 size_t count, loff_t *ppos) \
16 { \
17 struct wiphy *wiphy = file->private_data; \
18 char buf[buflen]; \
19 int res; \
20 \
21 res = scnprintf(buf, buflen, fmt "\n", ##value); \
22 return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
23 } \
24 \
25 static const struct file_operations name## _ops = { \
26 .read = name## _read, \
27 .open = simple_open, \
28 .llseek = generic_file_llseek, \
29 }
30
31 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
32 wiphy->rts_threshold);
33 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
34 wiphy->frag_threshold);
35 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
36 wiphy->retry_short);
37 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
38 wiphy->retry_long);
39
ht_print_chan(struct ieee80211_channel * chan,char * buf,int buf_size,int offset)40 static int ht_print_chan(struct ieee80211_channel *chan,
41 char *buf, int buf_size, int offset)
42 {
43 if (WARN_ON(offset > buf_size))
44 return 0;
45
46 if (chan->flags & IEEE80211_CHAN_DISABLED)
47 return scnprintf(buf + offset,
48 buf_size - offset,
49 "%d Disabled\n",
50 chan->center_freq);
51
52 return scnprintf(buf + offset,
53 buf_size - offset,
54 "%d HT40 %c%c\n",
55 chan->center_freq,
56 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ?
57 ' ' : '-',
58 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ?
59 ' ' : '+');
60 }
61
ht40allow_map_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)62 static ssize_t ht40allow_map_read(struct file *file,
63 char __user *user_buf,
64 size_t count, loff_t *ppos)
65 {
66 struct wiphy *wiphy = file->private_data;
67 char *buf;
68 unsigned int offset = 0, buf_size = PAGE_SIZE, i;
69 enum nl80211_band band;
70 struct ieee80211_supported_band *sband;
71 ssize_t r;
72
73 buf = kzalloc(buf_size, GFP_KERNEL);
74 if (!buf)
75 return -ENOMEM;
76
77 rtnl_lock();
78
79 for (band = 0; band < NUM_NL80211_BANDS; band++) {
80 sband = wiphy->bands[band];
81 if (!sband)
82 continue;
83 for (i = 0; i < sband->n_channels; i++)
84 offset += ht_print_chan(&sband->channels[i],
85 buf, buf_size, offset);
86 }
87
88 rtnl_unlock();
89
90 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
91
92 kfree(buf);
93
94 return r;
95 }
96
97 static const struct file_operations ht40allow_map_ops = {
98 .read = ht40allow_map_read,
99 .open = simple_open,
100 .llseek = default_llseek,
101 };
102
103 #define DEBUGFS_ADD(name) \
104 debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops)
105
cfg80211_debugfs_rdev_add(struct cfg80211_registered_device * rdev)106 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
107 {
108 struct dentry *phyd = rdev->wiphy.debugfsdir;
109
110 DEBUGFS_ADD(rts_threshold);
111 DEBUGFS_ADD(fragmentation_threshold);
112 DEBUGFS_ADD(short_retry_limit);
113 DEBUGFS_ADD(long_retry_limit);
114 DEBUGFS_ADD(ht40allow_map);
115 }
116