cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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debugfs.c (2914B)

      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...)		\
     14static 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									\
     25static const struct file_operations name## _ops = {			\
     26	.read = name## _read,						\
     27	.open = simple_open,						\
     28	.llseek = generic_file_llseek,					\
     29}
     30
     31DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
     32		      wiphy->rts_threshold);
     33DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
     34		      wiphy->frag_threshold);
     35DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
     36		      wiphy->retry_short);
     37DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
     38		      wiphy->retry_long);
     39
     40static 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
     62static 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	for (band = 0; band < NUM_NL80211_BANDS; band++) {
     77		sband = wiphy->bands[band];
     78		if (!sband)
     79			continue;
     80		for (i = 0; i < sband->n_channels; i++)
     81			offset += ht_print_chan(&sband->channels[i],
     82						buf, buf_size, offset);
     83	}
     84
     85	r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
     86
     87	kfree(buf);
     88
     89	return r;
     90}
     91
     92static const struct file_operations ht40allow_map_ops = {
     93	.read = ht40allow_map_read,
     94	.open = simple_open,
     95	.llseek = default_llseek,
     96};
     97
     98#define DEBUGFS_ADD(name)						\
     99	debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops)
    100
    101void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
    102{
    103	struct dentry *phyd = rdev->wiphy.debugfsdir;
    104
    105	DEBUGFS_ADD(rts_threshold);
    106	DEBUGFS_ADD(fragmentation_threshold);
    107	DEBUGFS_ADD(short_retry_limit);
    108	DEBUGFS_ADD(long_retry_limit);
    109	DEBUGFS_ADD(ht40allow_map);
    110}