1/*
2 * Copyright 2003-2005	Devicescape Software, Inc.
3 * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
4 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014  Intel Mobile Communications GmbH
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/debugfs.h>
13#include <linux/ieee80211.h>
14#include "ieee80211_i.h"
15#include "debugfs.h"
16#include "debugfs_sta.h"
17#include "sta_info.h"
18#include "driver-ops.h"
19
20/* sta attributtes */
21
22#define STA_READ(name, field, format_string)				\
23static ssize_t sta_ ##name## _read(struct file *file,			\
24				   char __user *userbuf,		\
25				   size_t count, loff_t *ppos)		\
26{									\
27	struct sta_info *sta = file->private_data;			\
28	return mac80211_format_buffer(userbuf, count, ppos, 		\
29				      format_string, sta->field);	\
30}
31#define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
32
33#define STA_OPS(name)							\
34static const struct file_operations sta_ ##name## _ops = {		\
35	.read = sta_##name##_read,					\
36	.open = simple_open,						\
37	.llseek = generic_file_llseek,					\
38}
39
40#define STA_OPS_RW(name)						\
41static const struct file_operations sta_ ##name## _ops = {		\
42	.read = sta_##name##_read,					\
43	.write = sta_##name##_write,					\
44	.open = simple_open,						\
45	.llseek = generic_file_llseek,					\
46}
47
48#define STA_FILE(name, field, format)					\
49		STA_READ_##format(name, field)				\
50		STA_OPS(name)
51
52STA_FILE(aid, sta.aid, D);
53
54static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
55			      size_t count, loff_t *ppos)
56{
57	char buf[121];
58	struct sta_info *sta = file->private_data;
59
60#define TEST(flg) \
61	test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""
62
63	int res = scnprintf(buf, sizeof(buf),
64			    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
65			    TEST(AUTH), TEST(ASSOC), TEST(PS_STA),
66			    TEST(PS_DRIVER), TEST(AUTHORIZED),
67			    TEST(SHORT_PREAMBLE),
68			    sta->sta.wme ? "WME\n" : "",
69			    TEST(WDS), TEST(CLEAR_PS_FILT),
70			    TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),
71			    TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),
72			    TEST(TDLS_PEER_AUTH), TEST(TDLS_INITIATOR),
73			    TEST(TDLS_CHAN_SWITCH), TEST(TDLS_OFF_CHANNEL),
74			    TEST(4ADDR_EVENT), TEST(INSERTED),
75			    TEST(RATE_CONTROL), TEST(TOFFSET_KNOWN),
76			    TEST(MPSP_OWNER), TEST(MPSP_RECIPIENT));
77#undef TEST
78	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
79}
80STA_OPS(flags);
81
82static ssize_t sta_num_ps_buf_frames_read(struct file *file,
83					  char __user *userbuf,
84					  size_t count, loff_t *ppos)
85{
86	struct sta_info *sta = file->private_data;
87	char buf[17*IEEE80211_NUM_ACS], *p = buf;
88	int ac;
89
90	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
91		p += scnprintf(p, sizeof(buf)+buf-p, "AC%d: %d\n", ac,
92			       skb_queue_len(&sta->ps_tx_buf[ac]) +
93			       skb_queue_len(&sta->tx_filtered[ac]));
94	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
95}
96STA_OPS(num_ps_buf_frames);
97
98static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
99				      size_t count, loff_t *ppos)
100{
101	char buf[15*IEEE80211_NUM_TIDS], *p = buf;
102	int i;
103	struct sta_info *sta = file->private_data;
104	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
105		p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
106			       le16_to_cpu(sta->last_seq_ctrl[i]));
107	p += scnprintf(p, sizeof(buf)+buf-p, "\n");
108	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
109}
110STA_OPS(last_seq_ctrl);
111
112static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
113					size_t count, loff_t *ppos)
114{
115	char buf[71 + IEEE80211_NUM_TIDS * 40], *p = buf;
116	int i;
117	struct sta_info *sta = file->private_data;
118	struct tid_ampdu_rx *tid_rx;
119	struct tid_ampdu_tx *tid_tx;
120
121	rcu_read_lock();
122
123	p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
124			sta->ampdu_mlme.dialog_token_allocator + 1);
125	p += scnprintf(p, sizeof(buf) + buf - p,
126		       "TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");
127
128	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
129		tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[i]);
130		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[i]);
131
132		p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
133		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_rx);
134		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
135				tid_rx ? tid_rx->dialog_token : 0);
136		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
137				tid_rx ? tid_rx->ssn : 0);
138
139		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_tx);
140		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
141				tid_tx ? tid_tx->dialog_token : 0);
142		p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
143				tid_tx ? skb_queue_len(&tid_tx->pending) : 0);
144		p += scnprintf(p, sizeof(buf) + buf - p, "\n");
145	}
146	rcu_read_unlock();
147
148	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
149}
150
151static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
152				    size_t count, loff_t *ppos)
153{
154	char _buf[12] = {}, *buf = _buf;
155	struct sta_info *sta = file->private_data;
156	bool start, tx;
157	unsigned long tid;
158	int ret;
159
160	if (count > sizeof(_buf))
161		return -EINVAL;
162
163	if (copy_from_user(buf, userbuf, count))
164		return -EFAULT;
165
166	buf[sizeof(_buf) - 1] = '\0';
167
168	if (strncmp(buf, "tx ", 3) == 0) {
169		buf += 3;
170		tx = true;
171	} else if (strncmp(buf, "rx ", 3) == 0) {
172		buf += 3;
173		tx = false;
174	} else
175		return -EINVAL;
176
177	if (strncmp(buf, "start ", 6) == 0) {
178		buf += 6;
179		start = true;
180		if (!tx)
181			return -EINVAL;
182	} else if (strncmp(buf, "stop ", 5) == 0) {
183		buf += 5;
184		start = false;
185	} else
186		return -EINVAL;
187
188	ret = kstrtoul(buf, 0, &tid);
189	if (ret)
190		return ret;
191
192	if (tid >= IEEE80211_NUM_TIDS)
193		return -EINVAL;
194
195	if (tx) {
196		if (start)
197			ret = ieee80211_start_tx_ba_session(&sta->sta, tid, 5000);
198		else
199			ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
200	} else {
201		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
202					       3, true);
203		ret = 0;
204	}
205
206	return ret ?: count;
207}
208STA_OPS_RW(agg_status);
209
210static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
211				size_t count, loff_t *ppos)
212{
213#define PRINT_HT_CAP(_cond, _str) \
214	do { \
215	if (_cond) \
216			p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
217	} while (0)
218	char buf[512], *p = buf;
219	int i;
220	struct sta_info *sta = file->private_data;
221	struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
222
223	p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
224			htc->ht_supported ? "" : "not ");
225	if (htc->ht_supported) {
226		p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
227
228		PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
229		PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
230		PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
231
232		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
233		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
234		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
235
236		PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
237		PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
238		PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
239		PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
240
241		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
242		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
243		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
244		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
245
246		PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
247
248		PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
249			     "3839 bytes");
250		PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
251			     "7935 bytes");
252
253		/*
254		 * For beacons and probe response this would mean the BSS
255		 * does or does not allow the usage of DSSS/CCK HT40.
256		 * Otherwise it means the STA does or does not use
257		 * DSSS/CCK HT40.
258		 */
259		PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
260		PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
261
262		/* BIT(13) is reserved */
263
264		PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
265
266		PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
267
268		p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
269				htc->ampdu_factor, htc->ampdu_density);
270		p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
271
272		for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
273			p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
274					htc->mcs.rx_mask[i]);
275		p += scnprintf(p, sizeof(buf)+buf-p, "\n");
276
277		/* If not set this is meaningless */
278		if (le16_to_cpu(htc->mcs.rx_highest)) {
279			p += scnprintf(p, sizeof(buf)+buf-p,
280				       "MCS rx highest: %d Mbps\n",
281				       le16_to_cpu(htc->mcs.rx_highest));
282		}
283
284		p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
285				htc->mcs.tx_params);
286	}
287
288	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
289}
290STA_OPS(ht_capa);
291
292static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
293				 size_t count, loff_t *ppos)
294{
295	char buf[128], *p = buf;
296	struct sta_info *sta = file->private_data;
297	struct ieee80211_sta_vht_cap *vhtc = &sta->sta.vht_cap;
298
299	p += scnprintf(p, sizeof(buf) + buf - p, "VHT %ssupported\n",
300			vhtc->vht_supported ? "" : "not ");
301	if (vhtc->vht_supported) {
302		p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.8x\n", vhtc->cap);
303
304		p += scnprintf(p, sizeof(buf)+buf-p, "RX MCS: %.4x\n",
305			       le16_to_cpu(vhtc->vht_mcs.rx_mcs_map));
306		if (vhtc->vht_mcs.rx_highest)
307			p += scnprintf(p, sizeof(buf)+buf-p,
308				       "MCS RX highest: %d Mbps\n",
309				       le16_to_cpu(vhtc->vht_mcs.rx_highest));
310		p += scnprintf(p, sizeof(buf)+buf-p, "TX MCS: %.4x\n",
311			       le16_to_cpu(vhtc->vht_mcs.tx_mcs_map));
312		if (vhtc->vht_mcs.tx_highest)
313			p += scnprintf(p, sizeof(buf)+buf-p,
314				       "MCS TX highest: %d Mbps\n",
315				       le16_to_cpu(vhtc->vht_mcs.tx_highest));
316	}
317
318	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
319}
320STA_OPS(vht_capa);
321
322
323#define DEBUGFS_ADD(name) \
324	debugfs_create_file(#name, 0400, \
325		sta->debugfs.dir, sta, &sta_ ##name## _ops);
326
327#define DEBUGFS_ADD_COUNTER(name, field)				\
328	if (sizeof(sta->field) == sizeof(u32))				\
329		debugfs_create_u32(#name, 0400, sta->debugfs.dir,	\
330			(u32 *) &sta->field);				\
331	else								\
332		debugfs_create_u64(#name, 0400, sta->debugfs.dir,	\
333			(u64 *) &sta->field);
334
335void ieee80211_sta_debugfs_add(struct sta_info *sta)
336{
337	struct ieee80211_local *local = sta->local;
338	struct ieee80211_sub_if_data *sdata = sta->sdata;
339	struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
340	u8 mac[3*ETH_ALEN];
341
342	sta->debugfs.add_has_run = true;
343
344	if (!stations_dir)
345		return;
346
347	snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
348
349	/*
350	 * This might fail due to a race condition:
351	 * When mac80211 unlinks a station, the debugfs entries
352	 * remain, but it is already possible to link a new
353	 * station with the same address which triggers adding
354	 * it to debugfs; therefore, if the old station isn't
355	 * destroyed quickly enough the old station's debugfs
356	 * dir might still be around.
357	 */
358	sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
359	if (!sta->debugfs.dir)
360		return;
361
362	DEBUGFS_ADD(flags);
363	DEBUGFS_ADD(num_ps_buf_frames);
364	DEBUGFS_ADD(last_seq_ctrl);
365	DEBUGFS_ADD(agg_status);
366	DEBUGFS_ADD(ht_capa);
367	DEBUGFS_ADD(vht_capa);
368
369	DEBUGFS_ADD_COUNTER(rx_duplicates, rx_stats.num_duplicates);
370	DEBUGFS_ADD_COUNTER(rx_fragments, rx_stats.fragments);
371	DEBUGFS_ADD_COUNTER(tx_filtered, status_stats.filtered);
372
373	if (sizeof(sta->driver_buffered_tids) == sizeof(u32))
374		debugfs_create_x32("driver_buffered_tids", 0400,
375				   sta->debugfs.dir,
376				   (u32 *)&sta->driver_buffered_tids);
377	else
378		debugfs_create_x64("driver_buffered_tids", 0400,
379				   sta->debugfs.dir,
380				   (u64 *)&sta->driver_buffered_tids);
381
382	drv_sta_add_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
383}
384
385void ieee80211_sta_debugfs_remove(struct sta_info *sta)
386{
387	struct ieee80211_local *local = sta->local;
388	struct ieee80211_sub_if_data *sdata = sta->sdata;
389
390	drv_sta_remove_debugfs(local, sdata, &sta->sta, sta->debugfs.dir);
391	debugfs_remove_recursive(sta->debugfs.dir);
392	sta->debugfs.dir = NULL;
393}
394