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https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw.git
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f2a65b8bbb
This should really be using the FSM in libosmocore/laforge/iu_up: take the best of both sides and integate in the libosmocore FSM implementation, then use it here. - in libosmocore, the FSM definition is nicer. - here, we have correct header checksums. This patch here also adds RTP header stripping/adding functionality, after introducing using msgb to pass data around. Change-Id: Ibc70e0aa00476926dd1f4ea8139c34f31f9cdfa3
118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/* IuUP protocol handling, minimal implementation */
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#pragma once
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#include <osmocom/core/endian.h>
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#include <osmocom/core/msgb.h>
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#define OSMO_IUUP_HEADROOM 32
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enum osmo_iuup_pdu_type {
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OSMO_IUUP_PDU_DATA_WITH_CRC = 0,
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OSMO_IUUP_PDU_CONTROL_PROCEDURE = 14,
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};
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enum osmo_iuup_acknack {
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OSMO_IUUP_ACKNACK_PROCEDURE = 0,
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OSMO_IUUP_ACKNACK_ACK = 1,
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OSMO_IUUP_ACKNACK_NACK = 2,
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};
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enum osmo_iuup_procedure {
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OSMO_IUUP_PROC_INITIALIZATION = 0,
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OSMO_IUUP_PROC_RATE_CONTROL = 1,
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OSMO_IUUP_PROC_TIME_ALIGNMENT = 2,
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OSMO_IUUP_PROC_ERROR_EVENT = 3,
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};
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enum osmo_iuup_frame_good {
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OSMO_IUUP_FRAME_GOOD = 0,
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OSMO_IUUP_FRAME_BAD = 1,
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OSMO_IUUP_FRAME_BAD_DUE_TO_RADIO = 2,
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};
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struct osmo_iuup_hdr_ctrl {
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#if OSMO_IS_BIG_ENDIAN
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uint8_t pdu_type:4,
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ack_nack:2,
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frame_nr:2;
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uint8_t mode_version:4,
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procedure:4;
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uint8_t header_crc:6,
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payload_crc_hi:2;
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uint8_t payload_crc_lo;
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uint8_t payload[0];
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#elif OSMO_IS_LITTLE_ENDIAN
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uint8_t frame_nr:2,
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ack_nack:2,
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pdu_type:4;
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uint8_t procedure:4,
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mode_version:4;
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uint8_t payload_crc_hi:2,
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header_crc:6;
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uint8_t payload_crc_lo;
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uint8_t payload[0];
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#endif
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} __attribute__((packed));
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union osmo_iuup_hdr_ctrl_payload {
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struct {
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#if OSMO_IS_BIG_ENDIAN
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uint8_t spare:3,
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iptis_present:1,
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subflows:3,
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chain:1;
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#elif OSMO_IS_LITTLE_ENDIAN
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uint8_t spare:3,
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iptis_present:1,
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subflows:3,
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chain:1;
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#endif
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} initialization;
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struct {
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#if OSMO_IS_BIG_ENDIAN
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uint8_t error_distance:2,
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error_cause:6;
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#elif OSMO_IS_LITTLE_ENDIAN
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uint8_t error_cause:6,
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error_distance:2;
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#endif
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} error_event;
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};
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extern const struct value_string osmo_iuup_error_cause_names[];
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static inline const char *osmo_iuup_error_cause_name(uint8_t val)
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{ return get_value_string(osmo_iuup_error_cause_names, val); }
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struct osmo_iuup_hdr_data {
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#if OSMO_IS_BIG_ENDIAN
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uint8_t pdu_type:4,
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frame_nr:4;
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uint8_t frame_good:2,
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rfci:6;
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uint8_t header_crc:6,
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payload_crc_hi:2;
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uint8_t payload_crc_lo;
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#elif OSMO_IS_LITTLE_ENDIAN
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uint8_t frame_nr:4,
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pdu_type:4;
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uint8_t rfci:6,
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frame_good:2;
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uint8_t payload_crc_hi:2,
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header_crc:6;
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uint8_t payload_crc_lo;
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#endif
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uint8_t payload[0];
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} __attribute__((packed));
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int osmo_iuup_classify(bool log_errors,
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const char *log_label,
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struct msgb *pdu,
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struct osmo_iuup_hdr_ctrl **is_ctrl,
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struct osmo_iuup_hdr_data **is_data);
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bool osmo_iuup_is_init(struct msgb *pdu);
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void osmo_iuup_make_init_ack(struct msgb *ack);
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void osmo_iuup_set_checksums(uint8_t *iuup_header_and_payload, unsigned int header_and_payload_len);
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