summaryrefslogtreecommitdiffstats
path: root/net/6lowpan/debugfs.c
blob: acbaa3db493b2085915ab0c2576be778c262ce0f (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
/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * 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.
 *
 * Authors:
 * (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
 * Copyright (c)  2015 Nordic Semiconductor. All Rights Reserved.
 */

#include <net/6lowpan.h>

#include "6lowpan_i.h"

#define LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS	8

static struct dentry *lowpan_debugfs;

static int lowpan_ctx_flag_active_set(void *data, u64 val)
{
	struct lowpan_iphc_ctx *ctx = data;

	if (val != 0 && val != 1)
		return -EINVAL;

	if (val)
		set_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
	else
		clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);

	return 0;
}

static int lowpan_ctx_flag_active_get(void *data, u64 *val)
{
	*val = lowpan_iphc_ctx_is_active(data);
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_flag_active_fops,
			lowpan_ctx_flag_active_get,
			lowpan_ctx_flag_active_set, "%llu\n");

static int lowpan_ctx_flag_c_set(void *data, u64 val)
{
	struct lowpan_iphc_ctx *ctx = data;

	if (val != 0 && val != 1)
		return -EINVAL;

	if (val)
		set_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
	else
		clear_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);

	return 0;
}

static int lowpan_ctx_flag_c_get(void *data, u64 *val)
{
	*val = lowpan_iphc_ctx_is_compression(data);
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_flag_c_fops, lowpan_ctx_flag_c_get,
			lowpan_ctx_flag_c_set, "%llu\n");

static int lowpan_ctx_plen_set(void *data, u64 val)
{
	struct lowpan_iphc_ctx *ctx = data;
	struct lowpan_iphc_ctx_table *t =
		container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);

	if (val > 128)
		return -EINVAL;

	spin_lock_bh(&t->lock);
	ctx->plen = val;
	spin_unlock_bh(&t->lock);

	return 0;
}

static int lowpan_ctx_plen_get(void *data, u64 *val)
{
	struct lowpan_iphc_ctx *ctx = data;
	struct lowpan_iphc_ctx_table *t =
		container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);

	spin_lock_bh(&t->lock);
	*val = ctx->plen;
	spin_unlock_bh(&t->lock);
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_plen_fops, lowpan_ctx_plen_get,
			lowpan_ctx_plen_set, "%llu\n");

static int lowpan_ctx_pfx_show(struct seq_file *file, void *offset)
{
	struct lowpan_iphc_ctx *ctx = file->private;
	struct lowpan_iphc_ctx_table *t =
		container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);

	spin_lock_bh(&t->lock);
	seq_printf(file, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
		   be16_to_cpu(ctx->pfx.s6_addr16[0]),
		   be16_to_cpu(ctx->pfx.s6_addr16[1]),
		   be16_to_cpu(ctx->pfx.s6_addr16[2]),
		   be16_to_cpu(ctx->pfx.s6_addr16[3]),
		   be16_to_cpu(ctx->pfx.s6_addr16[4]),
		   be16_to_cpu(ctx->pfx.s6_addr16[5]),
		   be16_to_cpu(ctx->pfx.s6_addr16[6]),
		   be16_to_cpu(ctx->pfx.s6_addr16[7]));
	spin_unlock_bh(&t->lock);

	return 0;
}

static int lowpan_ctx_pfx_open(struct inode *inode, struct file *file)
{
	return single_open(file, lowpan_ctx_pfx_show, inode->i_private);
}

static ssize_t lowpan_ctx_pfx_write(struct file *fp,
				    const char __user *user_buf, size_t count,
				    loff_t *ppos)
{
	char buf[128] = {};
	struct seq_file *file = fp->private_data;
	struct lowpan_iphc_ctx *ctx = file->private;
	struct lowpan_iphc_ctx_table *t =
		container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
	int status = count, n, i;
	unsigned int addr[8];

	if (copy_from_user(&buf, user_buf, min_t(size_t, sizeof(buf) - 1,
						 count))) {
		status = -EFAULT;
		goto out;
	}

	n = sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
		   &addr[0], &addr[1], &addr[2], &addr[3], &addr[4],
		   &addr[5], &addr[6], &addr[7]);
	if (n != LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS) {
		status = -EINVAL;
		goto out;
	}

	spin_lock_bh(&t->lock);
	for (i = 0; i < 8; i++)
		ctx->pfx.s6_addr16[i] = cpu_to_be16(addr[i] & 0xffff);
	spin_unlock_bh(&t->lock);

out:
	return status;
}

static const struct file_operations lowpan_ctx_pfx_fops = {
	.open		= lowpan_ctx_pfx_open,
	.read		= seq_read,
	.write		= lowpan_ctx_pfx_write,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int lowpan_dev_debugfs_ctx_init(struct net_device *dev,
				       struct dentry *ctx, u8 id)
{
	struct lowpan_dev *ldev = lowpan_dev(dev);
	struct dentry *dentry, *root;
	char buf[32];

	WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);

	sprintf(buf, "%d", id);

	root = debugfs_create_dir(buf, ctx);
	if (!root)
		return -EINVAL;

	dentry = debugfs_create_file("active", 0644, root,
				     &ldev->ctx.table[id],
				     &lowpan_ctx_flag_active_fops);
	if (!dentry)
		return -EINVAL;

	dentry = debugfs_create_file("compression", 0644, root,
				     &ldev->ctx.table[id],
				     &lowpan_ctx_flag_c_fops);
	if (!dentry)
		return -EINVAL;

	dentry = debugfs_create_file("prefix", 0644, root,
				     &ldev->ctx.table[id],
				     &lowpan_ctx_pfx_fops);
	if (!dentry)
		return -EINVAL;

	dentry = debugfs_create_file("prefix_len", 0644, root,
				     &ldev->ctx.table[id],
				     &lowpan_ctx_plen_fops);
	if (!dentry)
		return -EINVAL;

	return 0;
}

static int lowpan_context_show(struct seq_file *file, void *offset)
{
	struct lowpan_iphc_ctx_table *t = file->private;
	int i;

	seq_printf(file, "%3s|%-43s|%c\n", "cid", "prefix", 'C');
	seq_puts(file, "-------------------------------------------------\n");

	spin_lock_bh(&t->lock);
	for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
		if (!lowpan_iphc_ctx_is_active(&t->table[i]))
			continue;

		seq_printf(file, "%3d|%39pI6c/%-3d|%d\n", t->table[i].id,
			   &t->table[i].pfx, t->table[i].plen,
			   lowpan_iphc_ctx_is_compression(&t->table[i]));
	}
	spin_unlock_bh(&t->lock);

	return 0;
}

static int lowpan_context_open(struct inode *inode, struct file *file)
{
	return single_open(file, lowpan_context_show, inode->i_private);
}

static const struct file_operations lowpan_context_fops = {
	.open		= lowpan_context_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

int lowpan_dev_debugfs_init(struct net_device *dev)
{
	struct lowpan_dev *ldev = lowpan_dev(dev);
	struct dentry *contexts, *dentry;
	int ret, i;

	/* creating the root */
	ldev->iface_debugfs = debugfs_create_dir(dev->name, lowpan_debugfs);
	if (!ldev->iface_debugfs)
		goto fail;

	contexts = debugfs_create_dir("contexts", ldev->iface_debugfs);
	if (!contexts)
		goto remove_root;

	dentry = debugfs_create_file("show", 0644, contexts,
				     &lowpan_dev(dev)->ctx,
				     &lowpan_context_fops);
	if (!dentry)
		goto remove_root;

	for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
		ret = lowpan_dev_debugfs_ctx_init(dev, contexts, i);
		if (ret < 0)
			goto remove_root;
	}

	return 0;

remove_root:
	lowpan_dev_debugfs_exit(dev);
fail:
	return -EINVAL;
}

void lowpan_dev_debugfs_exit(struct net_device *dev)
{
	debugfs_remove_recursive(lowpan_dev(dev)->iface_debugfs);
}

int __init lowpan_debugfs_init(void)
{
	lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
	if (!lowpan_debugfs)
		return -EINVAL;

	return 0;
}

void lowpan_debugfs_exit(void)
{
	debugfs_remove_recursive(lowpan_debugfs);
}