| Neels Hofmeyr | 3243c7c | 2018-09-30 05:01:20 +0200 | [diff] [blame^] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | /* IuUP protocol handling, minimal implementation */ |
| 3 | |
| 4 | #pragma once |
| 5 | |
| 6 | #include <osmocom/core/endian.h> |
| 7 | #include <osmocom/core/msgb.h> |
| 8 | |
| 9 | #define OSMO_IUUP_HEADROOM 32 |
| 10 | |
| 11 | enum osmo_iuup_pdu_type { |
| 12 | OSMO_IUUP_PDU_DATA_WITH_CRC = 0, |
| 13 | OSMO_IUUP_PDU_CONTROL_PROCEDURE = 14, |
| 14 | }; |
| 15 | |
| 16 | enum osmo_iuup_acknack { |
| 17 | OSMO_IUUP_ACKNACK_PROCEDURE = 0, |
| 18 | OSMO_IUUP_ACKNACK_ACK = 1, |
| 19 | OSMO_IUUP_ACKNACK_NACK = 2, |
| 20 | }; |
| 21 | |
| 22 | enum osmo_iuup_procedure { |
| 23 | OSMO_IUUP_PROC_INITIALIZATION = 0, |
| 24 | }; |
| 25 | |
| 26 | enum osmo_iuup_frame_good { |
| 27 | OSMO_IUUP_FRAME_GOOD = 0, |
| 28 | OSMO_IUUP_FRAME_BAD = 1, |
| 29 | OSMO_IUUP_FRAME_BAD_DUE_TO_RADIO = 2, |
| 30 | }; |
| 31 | |
| 32 | struct osmo_iuup_hdr_ctrl { |
| 33 | #if OSMO_IS_BIG_ENDIAN |
| 34 | uint8_t pdu_type:4, |
| 35 | ack_nack:2, |
| 36 | frame_nr:2; |
| 37 | uint8_t mode_version:4, |
| 38 | procedure:4; |
| 39 | uint8_t header_crc:6, |
| 40 | payload_crc_hi:2; |
| 41 | uint8_t payload_crc_lo; |
| 42 | uint8_t payload[0]; |
| 43 | uint8_t spare:3, |
| 44 | iptis_present:1, |
| 45 | subflows:3, |
| 46 | chain:1; |
| 47 | #elif OSMO_IS_LITTLE_ENDIAN |
| 48 | uint8_t frame_nr:2, |
| 49 | ack_nack:2, |
| 50 | pdu_type:4; |
| 51 | uint8_t procedure:4, |
| 52 | mode_version:4; |
| 53 | uint8_t payload_crc_hi:2, |
| 54 | header_crc:6; |
| 55 | uint8_t payload_crc_lo; |
| 56 | uint8_t payload[0]; |
| 57 | uint8_t spare:3, |
| 58 | iptis_present:1, |
| 59 | subflows:3, |
| 60 | chain:1; |
| 61 | #endif |
| 62 | } __attribute__((packed)); |
| 63 | |
| 64 | struct osmo_iuup_hdr_data { |
| 65 | #if OSMO_IS_BIG_ENDIAN |
| 66 | uint8_t pdu_type:4, |
| 67 | frame_nr:4; |
| 68 | uint8_t frame_good:2, |
| 69 | rfci:6; |
| 70 | uint8_t header_crc:6, |
| 71 | payload_crc_hi:2; |
| 72 | uint8_t payload_crc_lo; |
| 73 | #elif OSMO_IS_LITTLE_ENDIAN |
| 74 | uint8_t frame_nr:4, |
| 75 | pdu_type:4; |
| 76 | uint8_t rfci:6, |
| 77 | frame_good:2; |
| 78 | uint8_t payload_crc_hi:2, |
| 79 | header_crc:6; |
| 80 | uint8_t payload_crc_lo; |
| 81 | #endif |
| 82 | uint8_t payload[0]; |
| 83 | } __attribute__((packed)); |
| 84 | |
| 85 | int osmo_iuup_classify(bool log_errors, |
| 86 | const char *log_label, |
| 87 | struct msgb *pdu, |
| 88 | struct osmo_iuup_hdr_ctrl **is_ctrl, |
| 89 | struct osmo_iuup_hdr_data **is_data); |
| 90 | bool osmo_iuup_is_init(struct msgb *pdu); |
| 91 | void osmo_iuup_make_init_ack(struct msgb *ack); |
| 92 | void osmo_iuup_set_checksums(uint8_t *iuup_header_and_payload, unsigned int header_and_payload_len); |