mirror of https://gerrit.osmocom.org/libosmocore
573 lines
16 KiB
C
573 lines
16 KiB
C
#pragma once
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#include <stdint.h>
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#include <string.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/bit16gen.h>
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#include <osmocom/core/bit32gen.h>
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/*! \defgroup tlv TLV parser
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* @{
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* \file tlv.h */
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/* Terminology / wording
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tag length value (in bits)
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V - - 8
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LV - 8 N * 8
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TLV 8 8 N * 8
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TL16V 8 16 N * 8
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TLV16 8 8 N * 16
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TvLV 8 8/16 N * 8
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vTvLV 8/16 8/16 N * 8
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T16LV 16 8 N * 8
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*/
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/*! gross length of a LV type field */
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#define LV_GROSS_LEN(x) (x+1)
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/*! gross length of a TLV type field */
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#define TLV_GROSS_LEN(x) (x+2)
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/*! gross length of a TLV16 type field */
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#define TLV16_GROSS_LEN(x) ((2*x)+2)
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/*! gross length of a TL16V type field */
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#define TL16V_GROSS_LEN(x) (x+3)
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/*! gross length of a L16TV type field */
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#define L16TV_GROSS_LEN(x) (x+3)
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/*! gross length of a T16LV type field */
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#define T16LV_GROSS_LEN(x) (x+3)
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/*! maximum length of TLV of one byte length */
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#define TVLV_MAX_ONEBYTE 0x7f
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/*! gross length of a TVLV type field */
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static inline uint16_t TVLV_GROSS_LEN(uint16_t len)
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{
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if (len <= TVLV_MAX_ONEBYTE)
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return TLV_GROSS_LEN(len);
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else
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return TL16V_GROSS_LEN(len);
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}
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/*! gross length of vTvL header (tag+len) */
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static inline uint16_t VTVL_GAN_GROSS_LEN(uint16_t tag, uint16_t len)
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{
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uint16_t ret = 2;
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if (tag > TVLV_MAX_ONEBYTE)
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ret++;
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if (len > TVLV_MAX_ONEBYTE)
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ret++;
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return ret;
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}
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/*! gross length of vTvLV (tag+len+val) */
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static inline uint16_t VTVLV_GAN_GROSS_LEN(uint16_t tag, uint16_t len)
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{
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uint16_t ret;
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if (len <= TVLV_MAX_ONEBYTE)
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ret = TLV_GROSS_LEN(len);
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else
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ret = TL16V_GROSS_LEN(len);
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if (tag > TVLV_MAX_ONEBYTE)
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ret += 1;
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return ret;
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}
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/* TLV generation */
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/*! put (append) a LV field */
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static inline uint8_t *lv_put(uint8_t *buf, uint8_t len,
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const uint8_t *val)
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{
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*buf++ = len;
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memcpy(buf, val, len);
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return buf + len;
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}
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/*! Append a TLV field, a Tag-Length-Value field.
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* \param[out] buf Location in a buffer to append TLV at.
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* \param[in] tag Tag id to write.
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* \param[in] len Length field to write and amount of bytes to append.
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* \param[in] val Pointer to data to append, or NULL to append zero data.
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* Always append tag and length. Append \a len bytes read from \a val. If val is NULL, append \a len zero
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* bytes instead. If \a len is zero, do not append any data apart from tag and length. */
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static inline uint8_t *tlv_put(uint8_t *buf, uint8_t tag, uint8_t len,
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const uint8_t *val)
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{
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*buf++ = tag;
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*buf++ = len;
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if (len) {
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if (val)
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memcpy(buf, val, len);
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else
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memset(buf, 0, len);
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}
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return buf + len;
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}
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/*! put (append) a TLV16 field */
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static inline uint8_t *tlv16_put(uint8_t *buf, uint8_t tag, uint8_t len,
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const uint16_t *val)
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{
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*buf++ = tag;
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*buf++ = len;
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memcpy(buf, val, len*2);
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return buf + len*2;
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}
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/*! put (append) a TL16V field */
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static inline uint8_t *tl16v_put(uint8_t *buf, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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*buf++ = tag;
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*buf++ = len >> 8;
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*buf++ = len & 0xff;
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memcpy(buf, val, len);
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return buf + len*2;
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}
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/*! put (append) a TL16V field */
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static inline uint8_t *t16lv_put(uint8_t *buf, uint16_t tag, uint8_t len,
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const uint8_t *val)
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{
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*buf++ = tag >> 8;
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*buf++ = tag & 0xff;
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*buf++ = len;
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memcpy(buf, val, len);
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return buf + len + 2;
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}
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/*! put (append) a TvLV field */
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static inline uint8_t *tvlv_put(uint8_t *buf, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *ret;
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if (len <= TVLV_MAX_ONEBYTE) {
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ret = tlv_put(buf, tag, len, val);
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buf[1] |= 0x80;
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} else
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ret = tl16v_put(buf, tag, len, val);
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return ret;
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}
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/*! put (append) a variable-length tag or variable-length length * */
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static inline uint8_t *vt_gan_put(uint8_t *buf, uint16_t tag)
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{
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if (tag > TVLV_MAX_ONEBYTE) {
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/* two-byte TAG */
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*buf++ = 0x80 | (tag >> 8);
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*buf++ = (tag & 0xff);
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} else
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*buf++ = tag;
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return buf;
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}
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/* put (append) vTvL (GAN) field (tag + length)*/
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static inline uint8_t *vtvl_gan_put(uint8_t *buf, uint16_t tag, uint16_t len)
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{
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uint8_t *ret;
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ret = vt_gan_put(buf, tag);
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return vt_gan_put(ret, len);
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}
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/* put (append) vTvLV (GAN) field (tag + length + val) */
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static inline uint8_t *vtvlv_gan_put(uint8_t *buf, uint16_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *ret;
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ret = vtvl_gan_put(buf, tag, len );
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memcpy(ret, val, len);
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ret = buf + len;
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return ret;
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}
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/*! put (append) a TLV16 field to \ref msgb */
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static inline uint8_t *msgb_tlv16_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint16_t *val)
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{
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uint8_t *buf = msgb_put(msg, TLV16_GROSS_LEN(len));
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return tlv16_put(buf, tag, len, val);
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}
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/*! put (append) a TL16V field to \ref msgb */
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static inline uint8_t *msgb_tl16v_put(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TL16V_GROSS_LEN(len));
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return tl16v_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_t16lv_put(struct msgb *msg, uint16_t tag, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, T16LV_GROSS_LEN(len));
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return t16lv_put(buf, tag, len, val);
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}
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/*! put (append) a TvLV field to \ref msgb */
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static inline uint8_t *msgb_tvlv_put(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TVLV_GROSS_LEN(len));
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return tvlv_put(buf, tag, len, val);
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}
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/*! put (append) a vTvLV field to \ref msgb */
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static inline uint8_t *msgb_vtvlv_gan_put(struct msgb *msg, uint16_t tag,
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uint16_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, VTVLV_GAN_GROSS_LEN(tag, len));
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return vtvlv_gan_put(buf, tag, len, val);
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}
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/*! put (append) a L16TV field to \ref msgb */
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static inline uint8_t *msgb_l16tv_put(struct msgb *msg, uint16_t len, uint8_t tag,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, L16TV_GROSS_LEN(len));
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*buf++ = len >> 8;
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*buf++ = len & 0xff;
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*buf++ = tag;
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memcpy(buf, val, len);
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return buf + len;
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}
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/*! put (append) a V field */
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static inline uint8_t *v_put(uint8_t *buf, uint8_t val)
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{
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*buf++ = val;
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return buf;
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}
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/*! put (append) a TV field */
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static inline uint8_t *tv_put(uint8_t *buf, uint8_t tag,
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uint8_t val)
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{
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*buf++ = tag;
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*buf++ = val;
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return buf;
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}
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/*! put (append) a TVfixed field */
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static inline uint8_t *tv_fixed_put(uint8_t *buf, uint8_t tag,
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unsigned int len, const uint8_t *val)
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{
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*buf++ = tag;
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memcpy(buf, val, len);
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return buf + len;
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}
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/*! put (append) a TV16 field
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* \param[in,out] buf data buffer
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* \param[in] tag Tag value
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* \param[in] val Value (in host byte order!)
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*/
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static inline uint8_t *tv16_put(uint8_t *buf, uint8_t tag,
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uint16_t val)
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{
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*buf++ = tag;
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*buf++ = val >> 8;
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*buf++ = val & 0xff;
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return buf;
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}
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/*! put (append) a LV field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_lv_put(struct msgb *msg, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, LV_GROSS_LEN(len));
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return lv_put(buf, len, val);
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}
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/*! put (append) a TLV field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_tlv_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TLV_GROSS_LEN(len));
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return tlv_put(buf, tag, len, val);
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}
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/*! put (append) a TV field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_tv_put(struct msgb *msg, uint8_t tag, uint8_t val)
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{
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uint8_t *buf = msgb_put(msg, 2);
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return tv_put(buf, tag, val);
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}
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/*! put (append) a TVfixed field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_tv_fixed_put(struct msgb *msg, uint8_t tag,
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unsigned int len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, 1+len);
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return tv_fixed_put(buf, tag, len, val);
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}
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/*! put (append) a V field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_v_put(struct msgb *msg, uint8_t val)
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{
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uint8_t *buf = msgb_put(msg, 1);
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return v_put(buf, val);
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}
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/*! put (append) a TL fields to a \ref msgb
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* \returns pointer to the length field so it can be updated after adding new information under specified tag */
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static inline uint8_t *msgb_tl_put(struct msgb *msg, uint8_t tag)
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{
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uint8_t *len = msgb_v_put(msg, tag);
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/* reserve space for length, len points to this reserved space already */
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msgb_v_put(msg, 0);
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return len;
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}
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/*! put (append) a TV16 field to a \ref msgb
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* \returns pointer to first byte after newly-put information */
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static inline uint8_t *msgb_tv16_put(struct msgb *msg, uint8_t tag, uint16_t val)
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{
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uint8_t *buf = msgb_put(msg, 3);
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return tv16_put(buf, tag, val);
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}
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/*! push (prepend) a TLV field to a \ref msgb
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* \returns pointer to first byte of newly-pushed information */
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static inline uint8_t *msgb_tlv_push(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_push(msg, TLV_GROSS_LEN(len));
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tlv_put(buf, tag, len, val);
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return buf;
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}
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/*! push 1-byte tagged value */
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static inline uint8_t *msgb_tlv1_push(struct msgb *msg, uint8_t tag, uint8_t val)
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{
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return msgb_tlv_push(msg, tag, 1, &val);
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}
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/*! push (prepend) a TV field to a \ref msgb
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* \returns pointer to first byte of newly-pushed information */
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static inline uint8_t *msgb_tv_push(struct msgb *msg, uint8_t tag, uint8_t val)
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{
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uint8_t *buf = msgb_push(msg, 2);
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tv_put(buf, tag, val);
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return buf;
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}
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/*! push (prepend) a TV16 field to a \ref msgb
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* \returns pointer to first byte of newly-pushed information */
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static inline uint8_t *msgb_tv16_push(struct msgb *msg, uint8_t tag, uint16_t val)
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{
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uint8_t *buf = msgb_push(msg, 3);
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tv16_put(buf, tag, val);
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return buf;
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}
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/*! push (prepend) a TvLV field to a \ref msgb
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* \returns pointer to first byte of newly-pushed information */
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static inline uint8_t *msgb_tvlv_push(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_push(msg, TVLV_GROSS_LEN(len));
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tvlv_put(buf, tag, len, val);
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return buf;
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}
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/* push (prepend) a vTvL header to a \ref msgb
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*/
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static inline uint8_t *msgb_vtvl_gan_push(struct msgb *msg, uint16_t tag,
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uint16_t len)
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{
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uint8_t *buf = msgb_push(msg, VTVL_GAN_GROSS_LEN(tag, len));
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vtvl_gan_put(buf, tag, len);
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return buf;
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}
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static inline uint8_t *msgb_vtvlv_gan_push(struct msgb *msg, uint16_t tag,
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uint16_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_push(msg, VTVLV_GAN_GROSS_LEN(tag, len));
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vtvlv_gan_put(buf, tag, len, val);
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return buf;
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}
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/* TLV parsing */
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/*! Entry in a TLV parser array */
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struct tlv_p_entry {
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uint16_t len; /*!< length */
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const uint8_t *val; /*!< pointer to value */
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};
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/*! TLV type */
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enum tlv_type {
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TLV_TYPE_NONE, /*!< no type */
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TLV_TYPE_FIXED, /*!< fixed-length value-only */
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TLV_TYPE_T, /*!< tag-only */
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TLV_TYPE_TV, /*!< tag-value (8bit) */
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TLV_TYPE_TLV, /*!< tag-length-value */
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TLV_TYPE_TL16V, /*!< tag, 16 bit length, value */
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TLV_TYPE_TvLV, /*!< tag, variable length, value */
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TLV_TYPE_SINGLE_TV, /*!< tag and value (both 4 bit) in 1 byte */
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TLV_TYPE_vTvLV_GAN, /*!< variable-length tag, variable-length length */
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};
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/*! Definition of a single IE (Information Element) */
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struct tlv_def {
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enum tlv_type type; /*!< TLV type */
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uint8_t fixed_len; /*!< length in case of \ref TLV_TYPE_FIXED */
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};
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/*! Definition of All 256 IE / TLV */
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struct tlv_definition {
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struct tlv_def def[256];
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};
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/*! result of the TLV parser */
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struct tlv_parsed {
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struct tlv_p_entry lv[256];
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};
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extern struct tlv_definition tvlv_att_def;
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extern struct tlv_definition vtvlv_gan_att_def;
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int tlv_parse_one(uint8_t *o_tag, uint16_t *o_len, const uint8_t **o_val,
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const struct tlv_definition *def,
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const uint8_t *buf, int buf_len);
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int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def,
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const uint8_t *buf, int buf_len, uint8_t lv_tag, uint8_t lv_tag2);
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int tlv_parse2(struct tlv_parsed *dec, int dec_multiples,
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const struct tlv_definition *def, const uint8_t *buf, int buf_len,
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uint8_t lv_tag, uint8_t lv_tag2);
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/* take a master (src) tlv def and fill up all empty slots in 'dst' */
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void tlv_def_patch(struct tlv_definition *dst, const struct tlv_definition *src);
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#define TLVP_PRESENT(x, y) ((x)->lv[y].val)
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#define TLVP_LEN(x, y) (x)->lv[y].len
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#define TLVP_VAL(x, y) (x)->lv[y].val
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#define TLVP_PRES_LEN(tp, tag, min_len) \
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(TLVP_PRESENT(tp, tag) && TLVP_LEN(tp, tag) >= min_len)
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/*! Return pointer to a TLV element if it is present.
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* Usage:
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* struct tlv_p_entry *e = TVLP_GET(&tp, TAG);
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* if (!e)
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* return -ENOENT;
|
|
* hexdump(e->val, e->len);
|
|
* \param[in] _tp pointer to \ref tlv_parsed.
|
|
* \param[in] tag IE tag to return.
|
|
* \returns struct tlv_p_entry pointer, or NULL if not present.
|
|
*/
|
|
#define TLVP_GET(_tp, tag) (TLVP_PRESENT(_tp, tag)? &(_tp)->lv[tag] : NULL)
|
|
|
|
/*! Like TLVP_GET(), but enforcing a minimum val length.
|
|
* \param[in] _tp pointer to \ref tlv_parsed.
|
|
* \param[in] tag IE tag to return.
|
|
* \param[in] min_len Minimum value length in bytes.
|
|
* \returns struct tlv_p_entry pointer, or NULL if not present or too short.
|
|
*/
|
|
#define TLVP_GET_MINLEN(_tp, tag, min_len) \
|
|
(TLVP_PRES_LEN(_tp, tag, min_len)? &(_tp)->lv[tag] : NULL)
|
|
|
|
/*! Like TLVP_VAL(), but enforcing a minimum val length.
|
|
* \param[in] _tp pointer to \ref tlv_parsed.
|
|
* \param[in] tag IE tag to return.
|
|
* \param[in] min_len Minimum value length in bytes.
|
|
* \returns const uint8_t pointer to value, or NULL if not present or too short.
|
|
*/
|
|
#define TLVP_VAL_MINLEN(_tp, tag, min_len) \
|
|
(TLVP_PRES_LEN(_tp, tag, min_len)? (_tp)->lv[tag].val : NULL)
|
|
|
|
|
|
/*! Obtain 1-byte TLV element.
|
|
* \param[in] tp pointer to \ref tlv_parsed
|
|
* \param[in] tag the Tag to look for
|
|
* \param[in] default_val default value to use if tag not available
|
|
* \returns the 1st byte of value with a given tag or default_val if tag was not found
|
|
*/
|
|
static inline uint8_t tlvp_val8(const struct tlv_parsed *tp, uint8_t tag, uint8_t default_val)
|
|
{
|
|
const uint8_t *res = TLVP_VAL_MINLEN(tp, tag, 1);
|
|
|
|
if (res)
|
|
return res[0];
|
|
|
|
return default_val;
|
|
}
|
|
|
|
/*! Align given TLV element with 16 bit value to an even address
|
|
* \param[in] tp pointer to \ref tlv_parsed
|
|
* \param[in] pos element to return
|
|
* \returns aligned 16 bit value
|
|
*/
|
|
static inline uint16_t tlvp_val16_unal(const struct tlv_parsed *tp, int pos)
|
|
{
|
|
uint16_t res;
|
|
memcpy(&res, TLVP_VAL(tp, pos), sizeof(res));
|
|
return res;
|
|
}
|
|
|
|
/*! Align given TLV element with 32 bit value to an address that is a multiple of 4
|
|
* \param[in] tp pointer to \ref tlv_parsed
|
|
* \param[in] pos element to return
|
|
* \returns aligned 32 bit value
|
|
*/
|
|
static inline uint32_t tlvp_val32_unal(const struct tlv_parsed *tp, int pos)
|
|
{
|
|
uint32_t res;
|
|
memcpy(&res, TLVP_VAL(tp, pos), sizeof(res));
|
|
return res;
|
|
}
|
|
|
|
/*! Retrieve (possibly unaligned) TLV element and convert to host byte order
|
|
* \param[in] tp pointer to \ref tlv_parsed
|
|
* \param[in] pos element to return
|
|
* \returns aligned 16 bit value in host byte order
|
|
*/
|
|
static inline uint16_t tlvp_val16be(const struct tlv_parsed *tp, int pos)
|
|
{
|
|
return osmo_load16be(TLVP_VAL(tp, pos));
|
|
}
|
|
|
|
/*! Retrieve (possibly unaligned) TLV element and convert to host byte order
|
|
* \param[in] tp pointer to \ref tlv_parsed
|
|
* \param[in] pos element to return
|
|
* \returns aligned 32 bit value in host byte order
|
|
*/
|
|
static inline uint32_t tlvp_val32be(const struct tlv_parsed *tp, int pos)
|
|
{
|
|
return osmo_load32be(TLVP_VAL(tp, pos));
|
|
}
|
|
|
|
|
|
struct tlv_parsed *osmo_tlvp_copy(const struct tlv_parsed *tp_orig, void *ctx);
|
|
int osmo_tlvp_merge(struct tlv_parsed *dst, const struct tlv_parsed *src);
|
|
int osmo_shift_v_fixed(uint8_t **data, size_t *data_len,
|
|
size_t len, uint8_t **value);
|
|
int osmo_match_shift_tv_fixed(uint8_t **data, size_t *data_len,
|
|
uint8_t tag, size_t len, uint8_t **value);
|
|
int osmo_shift_tlv(uint8_t **data, size_t *data_len,
|
|
uint8_t *tag, uint8_t **value, size_t *value_len);
|
|
int osmo_match_shift_tlv(uint8_t **data, size_t *data_len,
|
|
uint8_t tag, uint8_t **value, size_t *value_len);
|
|
int osmo_shift_lv(uint8_t **data, size_t *data_len,
|
|
uint8_t **value, size_t *value_len);
|
|
|
|
/*! @} */
|