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#ifndef _TLV_H
#define _TLV_H
#include <stdint.h>
#include <string.h>
#include <osmocom/core/msgb.h>
/*! \defgroup tlv GSM L3 compatible TLV parser
* @{
*/
/*! \file tlv.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
*/
/*! \brief gross length of a LV type field */
#define LV_GROSS_LEN(x) (x+1)
/*! \brief gross length of a TLV type field */
#define TLV_GROSS_LEN(x) (x+2)
/*! \brief gross length of a TLV16 type field */
#define TLV16_GROSS_LEN(x) ((2*x)+2)
/*! \brief gross length of a TL16V type field */
#define TL16V_GROSS_LEN(x) (x+3)
/*! \brief gross length of a L16TV type field */
#define L16TV_GROSS_LEN(x) (x+3)
/*! \brief maximum length of TLV of one byte length */
#define TVLV_MAX_ONEBYTE 0x7f
/*! \brief gross length of a TVLV type field */
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 */
/*! \brief put (append) a LV field */
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;
}
/*! \brief put (append) a TLV field */
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;
}
/*! \brief put (append) a TLV16 field */
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;
}
/*! \brief put (append) a TL16V field */
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;
}
/*! \brief put (append) a TvLV field */
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;
}
/*! \brief put (append) a TLV16 field to \ref msgb */
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);
}
/*! \brief put (append) a TL16V field to \ref msgb */
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);
}
/*! \brief put (append) a TvLV field to \ref msgb */
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);
}
/*! \brief put (append) a L16TV field to \ref msgb */
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;
}
/*! \brief put (append) a V field */
static inline uint8_t *v_put(uint8_t *buf, uint8_t val)
{
*buf++ = val;
return buf;
}
/*! \brief put (append) a TV field */
static inline uint8_t *tv_put(uint8_t *buf, uint8_t tag,
uint8_t val)
{
*buf++ = tag;
*buf++ = val;
return buf;
}
/*! \brief put (append) a TVfixed field */
static inline uint8_t *tv_fixed_put(uint8_t *buf, uint8_t tag,
unsigned int len, const uint8_t *val)
{
*buf++ = tag;
memcpy(buf, val, len);
return buf + len;
}
/*! \brief put (append) a TV16 field
* \param[in,out] buf data buffer
* \param[in] tag Tag value
* \param[in] val Value (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;
}
/*! \brief put (append) a LV field to a \ref msgb */
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);
}
/*! \brief put (append) a TLV field to a \ref msgb */
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);
}
/*! \brief put (append) a TV field to a \ref msgb */
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);
}
/*! \brief put (append) a TVfixed field to a \ref msgb */
static inline uint8_t *msgb_tv_fixed_put(struct msgb *msg, uint8_t tag,
unsigned int len, const uint8_t *val)
{
uint8_t *buf = msgb_put(msg, 1+len);
return tv_fixed_put(buf, tag, len, val);
}
/*! \brief put (append) a V field to a \ref msgb */
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);
}
/*! \brief put (append) a TV16 field to a \ref msgb */
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);
}
/*! \brief push (prepend) a TLV field to a \ref msgb */
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);
}
/*! \brief push (prepend) a TV field to a \ref msgb */
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);
}
/*! \brief push (prepend) a TV16 field to a \ref msgb */
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);
}
/*! \brief push (prepend) a TvLV field to a \ref msgb */
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 */
/*! \brief Entry in a TLV parser array */
struct tlv_p_entry {
uint16_t len; /*!< \brief length */
const uint8_t *val; /*!< \brief pointer to value */
};
/*! \brief TLV type */
enum tlv_type {
TLV_TYPE_NONE, /*!< \brief no type */
TLV_TYPE_FIXED, /*!< \brief fixed-length value-only */
TLV_TYPE_T, /*!< \brief tag-only */
TLV_TYPE_TV, /*!< \brief tag-value (8bit) */
TLV_TYPE_TLV, /*!< \brief tag-length-value */
TLV_TYPE_TL16V, /*!< \brief tag, 16 bit length, value */
TLV_TYPE_TvLV, /*!< \brief tag, variable length, value */
TLV_TYPE_SINGLE_TV /*!< \brief tag and value (both 4 bit) in 1 byte */
};
/*! \brief Definition of a single IE (Information Element) */
struct tlv_def {
enum tlv_type type; /*!< \brief TLV type */
uint8_t fixed_len; /*!< \brief length in case of \ref TLV_TYPE_FIXED */
};
/*! \brief Definition of All 256 IE / TLV */
struct tlv_definition {
struct tlv_def def[256];
};
/*! \brief result of the TLV parser */
struct tlv_parsed {
struct tlv_p_entry lv[256];
};
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 */
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