1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Authors:
5 * (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
6 * Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
7 */
8
9 #include <net/6lowpan.h>
10
11 #include "6lowpan_i.h"
12
13 #define LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS 8
14
15 static struct dentry *lowpan_debugfs;
16
17 static int lowpan_ctx_flag_active_set(void *data, u64 val)
18 {
19 struct lowpan_iphc_ctx *ctx = data;
20
21 if (val != 0 && val != 1)
22 return -EINVAL;
23
24 if (val)
25 set_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
26 else
27 clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
28
29 return 0;
30 }
31
32 static int lowpan_ctx_flag_active_get(void *data, u64 *val)
33 {
34 *val = lowpan_iphc_ctx_is_active(data);
35 return 0;
36 }
37
38 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_flag_active_fops,
39 lowpan_ctx_flag_active_get,
40 lowpan_ctx_flag_active_set, "%llu\n");
41
42 static int lowpan_ctx_flag_c_set(void *data, u64 val)
43 {
44 struct lowpan_iphc_ctx *ctx = data;
45
46 if (val != 0 && val != 1)
47 return -EINVAL;
48
49 if (val)
50 set_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
51 else
52 clear_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
53
54 return 0;
55 }
56
57 static int lowpan_ctx_flag_c_get(void *data, u64 *val)
58 {
59 *val = lowpan_iphc_ctx_is_compression(data);
60 return 0;
61 }
62
63 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_flag_c_fops, lowpan_ctx_flag_c_get,
64 lowpan_ctx_flag_c_set, "%llu\n");
65
66 static int lowpan_ctx_plen_set(void *data, u64 val)
67 {
68 struct lowpan_iphc_ctx *ctx = data;
69 struct lowpan_iphc_ctx_table *t =
70 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
71
72 if (val > 128)
73 return -EINVAL;
74
75 spin_lock_bh(&t->lock);
76 ctx->plen = val;
77 spin_unlock_bh(&t->lock);
78
79 return 0;
80 }
81
82 static int lowpan_ctx_plen_get(void *data, u64 *val)
83 {
84 struct lowpan_iphc_ctx *ctx = data;
85 struct lowpan_iphc_ctx_table *t =
86 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
87
88 spin_lock_bh(&t->lock);
89 *val = ctx->plen;
90 spin_unlock_bh(&t->lock);
91 return 0;
92 }
93
94 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_plen_fops, lowpan_ctx_plen_get,
95 lowpan_ctx_plen_set, "%llu\n");
96
97 static int lowpan_ctx_pfx_show(struct seq_file *file, void *offset)
98 {
99 struct lowpan_iphc_ctx *ctx = file->private;
100 struct lowpan_iphc_ctx_table *t =
101 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
102
103 spin_lock_bh(&t->lock);
104 seq_printf(file, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
105 be16_to_cpu(ctx->pfx.s6_addr16[0]),
106 be16_to_cpu(ctx->pfx.s6_addr16[1]),
107 be16_to_cpu(ctx->pfx.s6_addr16[2]),
108 be16_to_cpu(ctx->pfx.s6_addr16[3]),
109 be16_to_cpu(ctx->pfx.s6_addr16[4]),
110 be16_to_cpu(ctx->pfx.s6_addr16[5]),
111 be16_to_cpu(ctx->pfx.s6_addr16[6]),
112 be16_to_cpu(ctx->pfx.s6_addr16[7]));
113 spin_unlock_bh(&t->lock);
114
115 return 0;
116 }
117
118 static int lowpan_ctx_pfx_open(struct inode *inode, struct file *file)
119 {
120 return single_open(file, lowpan_ctx_pfx_show, inode->i_private);
121 }
122
123 static ssize_t lowpan_ctx_pfx_write(struct file *fp,
124 const char __user *user_buf, size_t count,
125 loff_t *ppos)
126 {
127 char buf[128] = {};
128 struct seq_file *file = fp->private_data;
129 struct lowpan_iphc_ctx *ctx = file->private;
130 struct lowpan_iphc_ctx_table *t =
131 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
132 int status = count, n, i;
133 unsigned int addr[8];
134
135 if (copy_from_user(&buf, user_buf, min_t(size_t, sizeof(buf) - 1,
136 count))) {
137 status = -EFAULT;
138 goto out;
139 }
140
141 n = sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
142 &addr[0], &addr[1], &addr[2], &addr[3], &addr[4],
143 &addr[5], &addr[6], &addr[7]);
144 if (n != LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS) {
145 status = -EINVAL;
146 goto out;
147 }
148
149 spin_lock_bh(&t->lock);
150 for (i = 0; i < 8; i++)
151 ctx->pfx.s6_addr16[i] = cpu_to_be16(addr[i] & 0xffff);
152 spin_unlock_bh(&t->lock);
153
154 out:
155 return status;
156 }
157
158 static const struct file_operations lowpan_ctx_pfx_fops = {
159 .open = lowpan_ctx_pfx_open,
160 .read = seq_read,
161 .write = lowpan_ctx_pfx_write,
162 .llseek = seq_lseek,
163 .release = single_release,
164 };
165
166 static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
167 struct dentry *ctx, u8 id)
168 {
169 struct lowpan_dev *ldev = lowpan_dev(dev);
170 struct dentry *root;
171 char buf[32];
172
173 if (WARN_ON_ONCE(id >= LOWPAN_IPHC_CTX_TABLE_SIZE))
174 return;
175
176 sprintf(buf, "%d", id);
177
178 root = debugfs_create_dir(buf, ctx);
179
180 debugfs_create_file("active", 0644, root, &ldev->ctx.table[id],
181 &lowpan_ctx_flag_active_fops);
182
183 debugfs_create_file("compression", 0644, root, &ldev->ctx.table[id],
184 &lowpan_ctx_flag_c_fops);
185
186 debugfs_create_file("prefix", 0644, root, &ldev->ctx.table[id],
187 &lowpan_ctx_pfx_fops);
188
189 debugfs_create_file("prefix_len", 0644, root, &ldev->ctx.table[id],
190 &lowpan_ctx_plen_fops);
191 }
192
193 static int lowpan_context_show(struct seq_file *file, void *offset)
194 {
195 struct lowpan_iphc_ctx_table *t = file->private;
196 int i;
197
198 seq_printf(file, "%3s|%-43s|%c\n", "cid", "prefix", 'C');
199 seq_puts(file, "-------------------------------------------------\n");
200
201 spin_lock_bh(&t->lock);
202 for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
203 if (!lowpan_iphc_ctx_is_active(&t->table[i]))
204 continue;
205
206 seq_printf(file, "%3d|%39pI6c/%-3d|%d\n", t->table[i].id,
207 &t->table[i].pfx, t->table[i].plen,
208 lowpan_iphc_ctx_is_compression(&t->table[i]));
209 }
210 spin_unlock_bh(&t->lock);
211
212 return 0;
213 }
214 DEFINE_SHOW_ATTRIBUTE(lowpan_context);
215
216 static int lowpan_short_addr_get(void *data, u64 *val)
217 {
218 struct wpan_dev *wdev = data;
219
220 rtnl_lock();
221 *val = le16_to_cpu(wdev->short_addr);
222 rtnl_unlock();
223
224 return 0;
225 }
226
227 DEFINE_DEBUGFS_ATTRIBUTE(lowpan_short_addr_fops, lowpan_short_addr_get, NULL,
228 "0x%04llx\n");
229
230 static void lowpan_dev_debugfs_802154_init(const struct net_device *dev,
231 struct lowpan_dev *ldev)
232 {
233 struct dentry *root;
234
235 if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
236 return;
237
238 root = debugfs_create_dir("ieee802154", ldev->iface_debugfs);
239
240 debugfs_create_file("short_addr", 0444, root,
241 lowpan_802154_dev(dev)->wdev->ieee802154_ptr,
242 &lowpan_short_addr_fops);
243 }
244
245 void lowpan_dev_debugfs_init(struct net_device *dev)
246 {
247 struct lowpan_dev *ldev = lowpan_dev(dev);
248 struct dentry *contexts;
249 int i;
250
251 /* creating the root */
252 ldev->iface_debugfs = debugfs_create_dir(dev->name, lowpan_debugfs);
253
254 contexts = debugfs_create_dir("contexts", ldev->iface_debugfs);
255
256 debugfs_create_file("show", 0644, contexts, &lowpan_dev(dev)->ctx,
257 &lowpan_context_fops);
258
259 for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
260 lowpan_dev_debugfs_ctx_init(dev, contexts, i);
261
262 lowpan_dev_debugfs_802154_init(dev, ldev);
263 }
264
265 void lowpan_dev_debugfs_exit(struct net_device *dev)
266 {
267 debugfs_remove_recursive(lowpan_dev(dev)->iface_debugfs);
268 }
269
270 void __init lowpan_debugfs_init(void)
271 {
272 lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
273 }
274
275 void lowpan_debugfs_exit(void)
276 {
277 debugfs_remove_recursive(lowpan_debugfs);
278 }
279
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