mirror of https://gerrit.osmocom.org/osmo-tetra
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
#ifndef TETRA_LLC_PDU_H
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#define TETRA_LLC_PDU_H
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#include <stdbool.h>
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#include <osmocom/core/linuxlist.h>
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/* Table 21.1 */
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enum tetra_llc_pdu_t {
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TLLC_PDUT_BL_ADATA = 0,
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TLLC_PDUT_BL_DATA = 1,
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TLLC_PDUT_BL_UDATA = 2,
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TLLC_PDUT_BL_ACK = 3,
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TLLC_PDUT_BL_ADATA_FCS = 4,
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TLLC_PDUT_BL_DATA_FCS = 5,
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TLLC_PDUT_BL_UDATA_FCS = 6,
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TLLC_PDUT_BL_ACK_FCS = 7,
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TLLC_PDUT_AL_SETUP = 8,
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TLLC_PDUT_AL_DATA_FINAL = 9,
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TLLC_PDUT_AL_UDATA_UFINAL = 10,
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TLLC_PDUT_AL_ACK_RNR = 11,
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TLLC_PDUT_AL_RECONNECT = 12,
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TLLC_PDUT_SUPPL = 13,
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TLLC_PDUT_L2SIG = 14,
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TLLD_PDUT_AL_DISC = 15
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};
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const char *tetra_get_llc_pdut_name(uint8_t pdut);
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/* Table 21.2 */
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enum tetra_llc_l2sig_pdu_t {
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TLLC_PDUT_L2_DATA_PRIO = 0,
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TLLC_PDUT_L2_SCHEDULE_SYNC = 1,
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TLLC_PDUT_L2_LINK_FB_CTRL = 2,
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TLLC_PDUT_L2_LINK_FB_INFO = 3,
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TLLC_PDUT_L2_LINK_FB_INFO_RD_PRIO = 4
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};
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/* Table 21.3 */
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enum tetra_llc_suppl_pdu_t {
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TLLC_PDUT_SUPPL_ALX_DATA_FINAL = 0,
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TLLC_PDUT_SUPPL_ALX_UDATA_UFINAL = 1,
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TLLC_PDUT_SUPPL_ALX_ACK_RNR = 2
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};
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/* Decoded */
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enum tllc_pdut_dec {
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TLLC_PDUT_DEC_UNKNOWN,
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TLLC_PDUT_DEC_BL_ADATA,
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TLLC_PDUT_DEC_BL_DATA,
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TLLC_PDUT_DEC_BL_UDATA,
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TLLC_PDUT_DEC_BL_ACK,
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TLLC_PDUT_DEC_AL_SETUP,
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TLLC_PDUT_DEC_AL_DATA,
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TLLC_PDUT_DEC_AL_FINAL,
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TLLC_PDUT_DEC_AL_UDATA,
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TLLC_PDUT_DEC_AL_UFINAL,
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TLLC_PDUT_DEC_AL_ACK,
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TLLC_PDUT_DEC_AL_RNR,
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TLLC_PDUT_DEC_AL_RECONNECT,
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TLLC_PDUT_DEC_AL_DISC,
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TLLC_PDUT_DEC_ALX_DATA,
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TLLC_PDUT_DEC_ALX_FINAL,
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TLLC_PDUT_DEC_ALX_UDATA,
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TLLC_PDUT_DEC_ALX_UFINAL,
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TLLC_PDUT_DEC_ALX_ACK,
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TLLC_PDUT_DEC_ALX_RNR,
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};
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const char *tetra_get_llc_pdut_dec_name(enum tllc_pdut_dec pdut);
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/* decoded/parsed PDU with easier encoding */
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struct tetra_llc_pdu {
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enum tllc_pdut_dec pdu_type;
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uint8_t nr; /* N(R) PDU number (receive) */
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uint8_t ns; /* N(S) PDU number (sent) */
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uint8_t ss; /* S(S) Segment (sent) */
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bool have_fcs; /* 1 if LLC PDU defines FCS is present */
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uint32_t fcs; /* FCS value extracted from pdu */
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bool fcs_invalid; /* 1 if extracted FCS does not match computed FCS */
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uint8_t *tl_sdu; /* pointer to bitbuf */
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uint32_t tl_sdu_len; /* in bits */
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};
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/* parse a received LLC PDU and parse it into 'lpp' */
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int tetra_llc_pdu_parse(struct tetra_llc_pdu *lpp, uint8_t *buf, int len);
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/* TETRA LLC state */
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struct tllc_state {
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struct llist_head list;
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struct {
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struct llist_head defrag_list;
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} rx;
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};
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/* entry in the defragmentation queue */
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struct tllc_defrag_q_e {
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struct llist_head list;
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unsigned int ns; /* current de-fragmenting */
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unsigned int last_ss; /* last received S(S) */
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struct msgb *tl_sdu;
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};
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#endif /* TETRA_LLC_PDU_H */
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