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Introduce LLC layer that has been completely missign so far

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All our MM/CMCE/SNDCP 'decodes' were broken previously, as they
assumed that the MM/CMCE/SNDCP message follows immediately after the
MAC header.  However, there's the LLC layer in between.

This is just simple LLC decoding and does not do re-assembly yet.
This commit is contained in:
Harald Welte 2011-04-24 11:10:52 +02:00
parent 2c6eab8f48
commit b5d6edbb82
4 changed files with 264 additions and 4 deletions
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80
src/tetra_llc_pdu.h Normal file
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#ifndef TETRA_LLC_PDU_H
#define TETRA_LLC_PDU_H
/* Table 21.1 */
enum tetra_llc_pdu_t {
TLLC_PDUT_BL_ADATA = 0,
TLLC_PDUT_BL_DATA = 1,
TLLC_PDUT_BL_UDATA = 2,
TLLC_PDUT_BL_ACK = 3,
TLLC_PDUT_BL_ADATA_FCS = 4,
TLLC_PDUT_BL_DATA_FCS = 5,
TLLC_PDUT_BL_UDATA_FCS = 6,
TLLC_PDUT_BL_ACK_FCS = 7,
TLLC_PDUT_AL_SETUP = 8,
TLLC_PDUT_AL_DATA_FINAL = 9,
TLLC_PDUT_AL_UDATA_UFINAL = 10,
TLLC_PDUT_AL_ACK_RNR = 11,
TLLC_PDUT_AL_RECONNECT = 12,
TLLC_PDUT_SUPPL = 13,
TLLC_PDUT_L2SIG = 14,
TLLD_PDUT_AL_DISC = 15
};
const char *tetra_get_llc_pdut_name(uint8_t pdut);
/* Table 21.2 */
enum tetra_llc_l2sig_pdu_t {
TLLC_PDUT_L2_DATA_PRIO = 0,
TLLC_PDUT_L2_SCHEDULE_SYNC = 1,
TLLC_PDUT_L2_LINK_FB_CTRL = 2,
TLLC_PDUT_L2_LINK_FB_INFO = 3,
TLLC_PDUT_L2_LINK_FB_INFO_RD_PRIO = 4
};
/* Table 21.3 */
enum tetra_llc_suppl_pdu_t {
TLLC_PDUT_SUPPL_ALX_DATA_FINAL = 0,
TLLC_PDUT_SUPPL_ALX_UDATA_UFINAL = 1,
TLLC_PDUT_SUPPL_ALX_ACK_RNR = 2
};
/* Decoded */
enum tllc_pdut_dec {
TLLC_PDUT_DEC_UNKNOWN,
TLLC_PDUT_DEC_BL_ADATA,
TLLC_PDUT_DEC_BL_DATA,
TLLC_PDUT_DEC_BL_UDATA,
TLLC_PDUT_DEC_BL_ACK,
TLLC_PDUT_DEC_AL_SETUP,
TLLC_PDUT_DEC_AL_DATA,
TLLC_PDUT_DEC_AL_FINAL,
TLLC_PDUT_DEC_AL_UDATA,
TLLC_PDUT_DEC_AL_UFINAL,
TLLC_PDUT_DEC_AL_ACK,
TLLC_PDUT_DEC_AL_RNR,
TLLC_PDUT_DEC_AL_RECONNECT,
TLLC_PDUT_DEC_AL_DISC,
TLLC_PDUT_DEC_ALX_DATA,
TLLC_PDUT_DEC_ALX_FINAL,
TLLC_PDUT_DEC_ALX_UDATA,
TLLC_PDUT_DEC_ALX_UFINAL,
TLLC_PDUT_DEC_ALX_ACK,
TLLC_PDUT_DEC_ALX_RNR,
};
const char *tetra_get_llc_pdut_dec_name(enum tllc_pdut_dec pdut);
struct tetra_llc_pdu {
enum tllc_pdut_dec pdu_type;
uint8_t nr;
uint8_t ns;
uint8_t ss;
uint32_t _fcs;
uint32_t *fcs;
uint8_t *tl_sdu; /* pointer to bitbuf */
uint8_t tl_sdu_len; /* in bits */
};
int tetra_llc_pdu_parse(struct tetra_llc_pdu *lpp, uint8_t *buf, int len);
#endif /* TETRA_LLC_PDU_H */