aboutsummaryrefslogtreecommitdiffstats
path: root/include/osmocore/tlv.h
blob: c733dbc9a5b261f17d0db0d74c396fbe72f5aed9 (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
#ifndef _TLV_H
#define _TLV_H

#include <stdint.h>
#include <string.h>

#include <osmocore/msgb.h>

/* Terminology / wording
		tag	length		value	(in bits)

	    V	-	-		8
	   LV	-	8		N * 8
	  TLV	8	8		N * 8
	TL16V	8	16		N * 8
	TLV16	8	8		N * 16
	 TvLV	8	8/16		N * 8

*/

#define LV_GROSS_LEN(x)		(x+1)
#define TLV_GROSS_LEN(x)	(x+2)
#define TLV16_GROSS_LEN(x)	((2*x)+2)
#define TL16V_GROSS_LEN(x)	(x+3)
#define L16TV_GROSS_LEN(x)	(x+3)

#define TVLV_MAX_ONEBYTE	0x7f

static inline uint16_t TVLV_GROSS_LEN(uint16_t len)
{
	if (len <= TVLV_MAX_ONEBYTE)
		return TLV_GROSS_LEN(len);
	else
		return TL16V_GROSS_LEN(len);
}

/* TLV generation */

static inline uint8_t *lv_put(uint8_t *buf, uint8_t len,
				const uint8_t *val)
{
	*buf++ = len;
	memcpy(buf, val, len);
	return buf + len;
}

static inline uint8_t *tlv_put(uint8_t *buf, uint8_t tag, uint8_t len,
				const uint8_t *val)
{
	*buf++ = tag;
	*buf++ = len;
	memcpy(buf, val, len);
	return buf + len;
}

static inline uint8_t *tlv16_put(uint8_t *buf, uint8_t tag, uint8_t len,
				const uint16_t *val)
{
	*buf++ = tag;
	*buf++ = len;
	memcpy(buf, val, len*2);
	return buf + len*2;
}

static inline uint8_t *tl16v_put(uint8_t *buf, uint8_t tag, uint16_t len,
				const uint8_t *val)
{
	*buf++ = tag;
	*buf++ = len >> 8;
	*buf++ = len & 0xff;
	memcpy(buf, val, len);
	return buf + len*2;
}

static inline uint8_t *tvlv_put(uint8_t *buf, uint8_t tag, uint16_t len,
				 const uint8_t *val)
{
	uint8_t *ret;

	if (len <= TVLV_MAX_ONEBYTE) {
		ret = tlv_put(buf, tag, len, val);
		buf[1] |= 0x80;
	} else
		ret = tl16v_put(buf, tag, len, val);

	return ret;
}

static inline uint8_t *msgb_tlv16_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint16_t *val)
{
	uint8_t *buf = msgb_put(msg, TLV16_GROSS_LEN(len));
	return tlv16_put(buf, tag, len, val);
}

static inline uint8_t *msgb_tl16v_put(struct msgb *msg, uint8_t tag, uint16_t len,
					const uint8_t *val)
{
	uint8_t *buf = msgb_put(msg, TL16V_GROSS_LEN(len));
	return tl16v_put(buf, tag, len, val);
}

static inline uint8_t *msgb_tvlv_put(struct msgb *msg, uint8_t tag, uint16_t len,
				      const uint8_t *val)
{
	uint8_t *buf = msgb_put(msg, TVLV_GROSS_LEN(len));
	return tvlv_put(buf, tag, len, val);
}

static inline uint8_t *msgb_l16tv_put(struct msgb *msg, uint16_t len, uint8_t tag,
                                       const uint8_t *val)
{
	uint8_t *buf = msgb_put(msg, L16TV_GROSS_LEN(len));

	*buf++ = len >> 8;
	*buf++ = len & 0xff;
	*buf++ = tag;
	memcpy(buf, val, len);
	return buf + len;
}

static inline uint8_t *v_put(uint8_t *buf, uint8_t val)
{
	*buf++ = val;
	return buf;
}

static inline uint8_t *tv_put(uint8_t *buf, uint8_t tag, 
				uint8_t val)
{
	*buf++ = tag;
	*buf++ = val;
	return buf;
}

/* 'val' is still in host byte order! */
static inline uint8_t *tv16_put(uint8_t *buf, uint8_t tag, 
				 uint16_t val)
{
	*buf++ = tag;
	*buf++ = val >> 8;
	*buf++ = val & 0xff;
	return buf;
}

static inline uint8_t *msgb_lv_put(struct msgb *msg, uint8_t len, const uint8_t *val)
{
	uint8_t *buf = msgb_put(msg, LV_GROSS_LEN(len));
	return lv_put(buf, len, val);
}

static inline uint8_t *msgb_tlv_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
{
	uint8_t *buf = msgb_put(msg, TLV_GROSS_LEN(len));
	return tlv_put(buf, tag, len, val);
}

static inline uint8_t *msgb_tv_put(struct msgb *msg, uint8_t tag, uint8_t val)
{
	uint8_t *buf = msgb_put(msg, 2);
	return tv_put(buf, tag, val);
}

static inline uint8_t *msgb_v_put(struct msgb *msg, uint8_t val)
{
	uint8_t *buf = msgb_put(msg, 1);
	return v_put(buf, val);
}

static inline uint8_t *msgb_tv16_put(struct msgb *msg, uint8_t tag, uint16_t val)
{
	uint8_t *buf = msgb_put(msg, 3);
	return tv16_put(buf, tag, val);
}

static inline uint8_t *msgb_tlv_push(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
{
	uint8_t *buf = msgb_push(msg, TLV_GROSS_LEN(len));
	return tlv_put(buf, tag, len, val);
}

static inline uint8_t *msgb_tv_push(struct msgb *msg, uint8_t tag, uint8_t val)
{
	uint8_t *buf = msgb_push(msg, 2);
	return tv_put(buf, tag, val);
}

static inline uint8_t *msgb_tv16_push(struct msgb *msg, uint8_t tag, uint16_t val)
{
	uint8_t *buf = msgb_push(msg, 3);
	return tv16_put(buf, tag, val);
}

static inline uint8_t *msgb_tvlv_push(struct msgb *msg, uint8_t tag, uint16_t len,
				      const uint8_t *val)
{
	uint8_t *buf = msgb_push(msg, TVLV_GROSS_LEN(len));
	return tvlv_put(buf, tag, len, val);
}

/* TLV parsing */

struct tlv_p_entry {
	uint16_t len;
	const uint8_t *val;
};

enum tlv_type {
	TLV_TYPE_NONE,
	TLV_TYPE_FIXED,
	TLV_TYPE_T,
	TLV_TYPE_TV,
	TLV_TYPE_TLV,
	TLV_TYPE_TL16V,
	TLV_TYPE_TvLV,
};

struct tlv_def {
	enum tlv_type type;
	uint8_t fixed_len;
};

struct tlv_definition {
	struct tlv_def def[0xff];
};

struct tlv_parsed {
	struct tlv_p_entry lv[0xff];
};

extern struct tlv_definition tvlv_att_def;

int tlv_parse_one(uint8_t *o_tag, uint16_t *o_len, const uint8_t **o_val,
                  const struct tlv_definition *def,
                  const uint8_t *buf, int buf_len);
int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def,
	      const uint8_t *buf, int buf_len, uint8_t lv_tag, uint8_t lv_tag2);
/* take a master (src) tlvdev and fill up all empty slots in 'dst' */
void tlv_def_patch(struct tlv_definition *dst, const struct tlv_definition *src);

#define TLVP_PRESENT(x, y)	((x)->lv[y].val)
#define TLVP_LEN(x, y)		(x)->lv[y].len
#define TLVP_VAL(x, y)		(x)->lv[y].val

#endif /* _TLV_H */