| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| /* IuUP protocol handling, minimal implementation */ |
| |
| #pragma once |
| |
| #include <osmocom/core/endian.h> |
| #include <osmocom/core/msgb.h> |
| |
| #define OSMO_IUUP_HEADROOM 32 |
| |
| enum osmo_iuup_pdu_type { |
| OSMO_IUUP_PDU_DATA_WITH_CRC = 0, |
| OSMO_IUUP_PDU_CONTROL_PROCEDURE = 14, |
| }; |
| |
| enum osmo_iuup_acknack { |
| OSMO_IUUP_ACKNACK_PROCEDURE = 0, |
| OSMO_IUUP_ACKNACK_ACK = 1, |
| OSMO_IUUP_ACKNACK_NACK = 2, |
| }; |
| |
| enum osmo_iuup_procedure { |
| OSMO_IUUP_PROC_INITIALIZATION = 0, |
| OSMO_IUUP_PROC_RATE_CONTROL = 1, |
| OSMO_IUUP_PROC_TIME_ALIGNMENT = 2, |
| OSMO_IUUP_PROC_ERROR_EVENT = 3, |
| }; |
| |
| enum osmo_iuup_frame_good { |
| OSMO_IUUP_FRAME_GOOD = 0, |
| OSMO_IUUP_FRAME_BAD = 1, |
| OSMO_IUUP_FRAME_BAD_DUE_TO_RADIO = 2, |
| }; |
| |
| struct osmo_iuup_hdr_ctrl { |
| #if OSMO_IS_BIG_ENDIAN |
| uint8_t pdu_type:4, |
| ack_nack:2, |
| frame_nr:2; |
| uint8_t mode_version:4, |
| procedure:4; |
| uint8_t header_crc:6, |
| payload_crc_hi:2; |
| uint8_t payload_crc_lo; |
| uint8_t payload[0]; |
| #elif OSMO_IS_LITTLE_ENDIAN |
| uint8_t frame_nr:2, |
| ack_nack:2, |
| pdu_type:4; |
| uint8_t procedure:4, |
| mode_version:4; |
| uint8_t payload_crc_hi:2, |
| header_crc:6; |
| uint8_t payload_crc_lo; |
| uint8_t payload[0]; |
| #endif |
| } __attribute__((packed)); |
| |
| union osmo_iuup_hdr_ctrl_payload { |
| struct { |
| #if OSMO_IS_BIG_ENDIAN |
| uint8_t spare:3, |
| iptis_present:1, |
| subflows:3, |
| chain:1; |
| #elif OSMO_IS_LITTLE_ENDIAN |
| uint8_t spare:3, |
| iptis_present:1, |
| subflows:3, |
| chain:1; |
| #endif |
| } initialization; |
| |
| struct { |
| #if OSMO_IS_BIG_ENDIAN |
| uint8_t error_distance:2, |
| error_cause:6; |
| #elif OSMO_IS_LITTLE_ENDIAN |
| uint8_t error_cause:6, |
| error_distance:2; |
| #endif |
| } error_event; |
| }; |
| |
| extern const struct value_string osmo_iuup_error_cause_names[]; |
| static inline const char *osmo_iuup_error_cause_name(uint8_t val) |
| { return get_value_string(osmo_iuup_error_cause_names, val); } |
| |
| struct osmo_iuup_hdr_data { |
| #if OSMO_IS_BIG_ENDIAN |
| uint8_t pdu_type:4, |
| frame_nr:4; |
| uint8_t frame_good:2, |
| rfci:6; |
| uint8_t header_crc:6, |
| payload_crc_hi:2; |
| uint8_t payload_crc_lo; |
| #elif OSMO_IS_LITTLE_ENDIAN |
| uint8_t frame_nr:4, |
| pdu_type:4; |
| uint8_t rfci:6, |
| frame_good:2; |
| uint8_t payload_crc_hi:2, |
| header_crc:6; |
| uint8_t payload_crc_lo; |
| #endif |
| uint8_t payload[0]; |
| } __attribute__((packed)); |
| |
| int osmo_iuup_classify(bool log_errors, |
| const char *log_label, |
| struct msgb *pdu, |
| struct osmo_iuup_hdr_ctrl **is_ctrl, |
| struct osmo_iuup_hdr_data **is_data); |
| bool osmo_iuup_is_init(struct msgb *pdu); |
| void osmo_iuup_make_init_ack(struct msgb *ack); |
| void osmo_iuup_set_checksums(uint8_t *iuup_header_and_payload, unsigned int header_and_payload_len); |