summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/bat_debugfs.c
blob: 0e9d43509935cfb71e3253a2189be6b1a6f916d4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 * Copyright (C) 2010-2011 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 *
 */

#include "main.h"

#include <linux/debugfs.h>

#include "bat_debugfs.h"
#include "translation-table.h"
#include "originator.h"
#include "hard-interface.h"
#include "gateway_common.h"
#include "gateway_client.h"
#include "soft-interface.h"
#include "vis.h"
#include "icmp_socket.h"

static struct dentry *bat_debugfs;

#ifdef CONFIG_BATMAN_ADV_DEBUG
#define LOG_BUFF_MASK (log_buff_len-1)
#define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK])

static int log_buff_len = LOG_BUF_LEN;

static void emit_log_char(struct debug_log *debug_log, char c)
{
	LOG_BUFF(debug_log->log_end) = c;
	debug_log->log_end++;

	if (debug_log->log_end - debug_log->log_start > log_buff_len)
		debug_log->log_start = debug_log->log_end - log_buff_len;
}

static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
{
	va_list args;
	static char debug_log_buf[256];
	char *p;

	if (!debug_log)
		return 0;

	spin_lock_bh(&debug_log->lock);
	va_start(args, fmt);
	vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
	va_end(args);

	for (p = debug_log_buf; *p != 0; p++)
		emit_log_char(debug_log, *p);

	spin_unlock_bh(&debug_log->lock);

	wake_up(&debug_log->queue_wait);

	return 0;
}

int debug_log(struct bat_priv *bat_priv, char *fmt, ...)
{
	va_list args;
	char tmp_log_buf[256];

	va_start(args, fmt);
	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
	fdebug_log(bat_priv->debug_log, "[%10u] %s",
		   (jiffies / HZ), tmp_log_buf);
	va_end(args);

	return 0;
}

static int log_open(struct inode *inode, struct file *file)
{
	nonseekable_open(inode, file);
	file->private_data = inode->i_private;
	inc_module_count();
	return 0;
}

static int log_release(struct inode *inode, struct file *file)
{
	dec_module_count();
	return 0;
}

static ssize_t log_read(struct file *file, char __user *buf,
			size_t count, loff_t *ppos)
{
	struct bat_priv *bat_priv = file->private_data;
	struct debug_log *debug_log = bat_priv->debug_log;
	int error, i = 0;
	char c;

	if ((file->f_flags & O_NONBLOCK) &&
	    !(debug_log->log_end - debug_log->log_start))
		return -EAGAIN;

	if ((!buf) || (count < 0))
		return -EINVAL;

	if (count == 0)
		return 0;

	if (!access_ok(VERIFY_WRITE, buf, count))
		return -EFAULT;

	error = wait_event_interruptible(debug_log->queue_wait,
				(debug_log->log_start - debug_log->log_end));

	if (error)
		return error;

	spin_lock_bh(&debug_log->lock);

	while ((!error) && (i < count) &&
	       (debug_log->log_start != debug_log->log_end)) {
		c = LOG_BUFF(debug_log->log_start);

		debug_log->log_start++;

		spin_unlock_bh(&debug_log->lock);

		error = __put_user(c, buf);

		spin_lock_bh(&debug_log->lock);

		buf++;
		i++;

	}

	spin_unlock_bh(&debug_log->lock);

	if (!error)
		return i;

	return error;
}

static unsigned int log_poll(struct file *file, poll_table *wait)
{
	struct bat_priv *bat_priv = file->private_data;
	struct debug_log *debug_log = bat_priv->debug_log;

	poll_wait(file, &debug_log->queue_wait, wait);

	if (debug_log->log_end - debug_log->log_start)
		return POLLIN | POLLRDNORM;

	return 0;
}

static const struct file_operations log_fops = {
	.open           = log_open,
	.release        = log_release,
	.read           = log_read,
	.poll           = log_poll,
	.llseek         = no_llseek,
};

static int debug_log_setup(struct bat_priv *bat_priv)
{
	struct dentry *d;

	if (!bat_priv->debug_dir)
		goto err;

	bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
	if (!bat_priv->debug_log)
		goto err;

	spin_lock_init(&bat_priv->debug_log->lock);
	init_waitqueue_head(&bat_priv->debug_log->queue_wait);

	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
				bat_priv->debug_dir, bat_priv, &log_fops);
	if (d)
		goto err;

	return 0;

err:
	return 1;
}

static void debug_log_cleanup(struct bat_priv *bat_priv)
{
	kfree(bat_priv->debug_log);
	bat_priv->debug_log = NULL;
}
#else /* CONFIG_BATMAN_ADV_DEBUG */
static int debug_log_setup(struct bat_priv *bat_priv)
{
	bat_priv->debug_log = NULL;
	return 0;
}

static void debug_log_cleanup(struct bat_priv *bat_priv)
{
	return;
}
#endif

static int originators_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, orig_seq_print_text, net_dev);
}

static int gateways_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, gw_client_seq_print_text, net_dev);
}

static int softif_neigh_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, softif_neigh_seq_print_text, net_dev);
}

static int transtable_global_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, hna_global_seq_print_text, net_dev);
}

static int transtable_local_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, hna_local_seq_print_text, net_dev);
}

static int vis_data_open(struct inode *inode, struct file *file)
{
	struct net_device *net_dev = (struct net_device *)inode->i_private;
	return single_open(file, vis_seq_print_text, net_dev);
}

struct bat_debuginfo {
	struct attribute attr;
	const struct file_operations fops;
};

#define BAT_DEBUGINFO(_name, _mode, _open)	\
struct bat_debuginfo bat_debuginfo_##_name = {	\
	.attr = { .name = __stringify(_name),	\
		  .mode = _mode, },		\
	.fops = { .owner = THIS_MODULE,		\
		  .open = _open,		\
		  .read	= seq_read,		\
		  .llseek = seq_lseek,		\
		  .release = single_release,	\
		}				\
};

static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);

static struct bat_debuginfo *mesh_debuginfos[] = {
	&bat_debuginfo_originators,
	&bat_debuginfo_gateways,
	&bat_debuginfo_softif_neigh,
	&bat_debuginfo_transtable_global,
	&bat_debuginfo_transtable_local,
	&bat_debuginfo_vis_data,
	NULL,
};

void debugfs_init(void)
{
	bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
	if (bat_debugfs == ERR_PTR(-ENODEV))
		bat_debugfs = NULL;
}

void debugfs_destroy(void)
{
	if (bat_debugfs) {
		debugfs_remove_recursive(bat_debugfs);
		bat_debugfs = NULL;
	}
}

int debugfs_add_meshif(struct net_device *dev)
{
	struct bat_priv *bat_priv = netdev_priv(dev);
	struct bat_debuginfo **bat_debug;
	struct dentry *file;

	if (!bat_debugfs)
		goto out;

	bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
	if (!bat_priv->debug_dir)
		goto out;

	bat_socket_setup(bat_priv);
	debug_log_setup(bat_priv);

	for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
		file = debugfs_create_file(((*bat_debug)->attr).name,
					  S_IFREG | ((*bat_debug)->attr).mode,
					  bat_priv->debug_dir,
					  dev, &(*bat_debug)->fops);
		if (!file) {
			bat_err(dev, "Can't add debugfs file: %s/%s\n",
				dev->name, ((*bat_debug)->attr).name);
			goto rem_attr;
		}
	}

	return 0;
rem_attr:
	debugfs_remove_recursive(bat_priv->debug_dir);
	bat_priv->debug_dir = NULL;
out:
#ifdef CONFIG_DEBUG_FS
	return -ENOMEM;
#else
	return 0;
#endif /* CONFIG_DEBUG_FS */
}

void debugfs_del_meshif(struct net_device *dev)
{
	struct bat_priv *bat_priv = netdev_priv(dev);

	debug_log_cleanup(bat_priv);

	if (bat_debugfs) {
		debugfs_remove_recursive(bat_priv->debug_dir);
		bat_priv->debug_dir = NULL;
	}
}