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 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 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, r; 69 enum nl80211_band band; 70 struct ieee80211_supported_band *sband; 71 72 buf = kzalloc(buf_size, GFP_KERNEL); 73 if (!buf) 74 return -ENOMEM; 75 76 rtnl_lock(); 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 rtnl_unlock(); 88 89 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset); 90 91 kfree(buf); 92 93 return r; 94 } 95 96 static const struct file_operations ht40allow_map_ops = { 97 .read = ht40allow_map_read, 98 .open = simple_open, 99 .llseek = default_llseek, 100 }; 101 102 #define DEBUGFS_ADD(name) \ 103 debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops) 104 105 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev) 106 { 107 struct dentry *phyd = rdev->wiphy.debugfsdir; 108 109 DEBUGFS_ADD(rts_threshold); 110 DEBUGFS_ADD(fragmentation_threshold); 111 DEBUGFS_ADD(short_retry_limit); 112 DEBUGFS_ADD(long_retry_limit); 113 DEBUGFS_ADD(ht40allow_map); 114 } 115