From f7e9c51bdc61713c39a26f28a469173f225f4711 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Wed, 6 Mar 2019 04:25:38 +0100 Subject: BSSMAP: add messages for inter-BSC and inter-MSC Handover Change-Id: I9dac375331f6bea744769e973725d58e35f87226 --- src/gsm/gsm0808.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 171 insertions(+) (limited to 'src/gsm/gsm0808.c') diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c index 3307a5dd..4406043a 100644 --- a/src/gsm/gsm0808.c +++ b/src/gsm/gsm0808.c @@ -857,6 +857,129 @@ struct msgb *gsm0808_create_handover_required(const struct gsm0808_handover_requ return msg; } +/*! Create BSSMAP HANDOVER REQUIRED REJECT message. + * \returns newly allocated msgb with BSSMAP HANDOVER REQUIRED REJECT message. */ +struct msgb *gsm0808_create_handover_required_reject(const struct gsm0808_handover_required_reject *params) +{ + struct msgb *msg; + + msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "BSSMAP-HANDOVER-REQUIRED-REJECT"); + if (!msg) + return NULL; + + /* Message Type, 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_HANDOVER_REQUIRED_REJECT); + + /* Cause, 3.2.2.5 */ + gsm0808_enc_cause(msg, params->cause); + + /* prepend the header */ + msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + +/*! Create BSSMAP HANDOVER REQUEST message, 3GPP TS 48.008 3.2.1.8. + * Sent from the MSC to the potential new target cell during inter-BSC handover, or to the target MSC during inter-MSC + * handover. + */ +struct msgb *gsm0808_create_handover_request(const struct gsm0808_handover_request *params) +{ + struct msgb *msg; + + msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "BSSMAP-HANDOVER-REQUEST"); + if (!msg) + return NULL; + + /* Message Type, 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_HANDOVER_RQST); + + /* Channel Type 3.2.2.11 */ + gsm0808_enc_channel_type(msg, ¶ms->channel_type); + + /* Encryption Information 3.2.2.10 */ + gsm0808_enc_encrypt_info(msg, ¶ms->encryption_information); + + /* Classmark Information 1 3.2.2.30 or Classmark Information 2 3.2.2.19 (Classmark 2 wins) */ + if (params->classmark_information.classmark2_len) { + msgb_tlv_put(msg, GSM0808_IE_CLASSMARK_INFORMATION_T2, + params->classmark_information.classmark2_len, + (const uint8_t*)¶ms->classmark_information.classmark2); + } else if (params->classmark_information.classmark1_set) { + msgb_tlv_put(msg, GSM0808_IE_CLASSMARK_INFORMATION_TYPE_1, + sizeof(params->classmark_information.classmark1), + (const uint8_t*)¶ms->classmark_information.classmark1); + } + /* (Classmark 3 possibly follows below) */ + + /* Cell Identifier (Serving) , 3.2.2.17 */ + gsm0808_enc_cell_id(msg, ¶ms->cell_identifier_serving); + + /* Cell Identifier (Target) , 3.2.2.17 */ + gsm0808_enc_cell_id(msg, ¶ms->cell_identifier_target); + + /* Cause, 3.2.2.5 */ + gsm0808_enc_cause(msg, params->cause); + + /* Classmark Information 3 3.2.2.20 */ + if (params->classmark_information.classmark3_len) { + msgb_tlv_put(msg, GSM0808_IE_CLASSMARK_INFORMATION_T3, + params->classmark_information.classmark3_len, + (const uint8_t*)¶ms->classmark_information.classmark3); + } + + /* Current Channel type 1 3.2.2.49 */ + if (params->current_channel_type_1_present) + msgb_tv_fixed_put(msg, GSM0808_IE_CURRENT_CHANNEL_TYPE_1, 1, ¶ms->current_channel_type_1); + + /* Speech Version (Used), 3.2.2.51 */ + if (params->speech_version_used) { + msgb_tv_put(msg, GSM0808_IE_SPEECH_VERSION, params->speech_version_used); + } + + /* Chosen Encryption Algorithm (Serving) 3.2.2.44 */ + if (params->chosen_encryption_algorithm_serving) + msgb_tv_put(msg, GSM0808_IE_CHOSEN_ENCR_ALG, params->chosen_encryption_algorithm_serving); + + /* Old BSS to New BSS Information 3.2.2.58 */ + if (params->old_bss_to_new_bss_info_raw && params->old_bss_to_new_bss_info_raw_len) { + msgb_tlv_put(msg, GSM0808_IE_OLD_BSS_TO_NEW_BSS_INFORMATION, + params->old_bss_to_new_bss_info_raw_len, + params->old_bss_to_new_bss_info_raw); + } else if (params->old_bss_to_new_bss_info_present) { + put_old_bss_to_new_bss_information(msg, ¶ms->old_bss_to_new_bss_info); + } + + /* IMSI 3.2.2.6 */ + if (params->imsi) { + uint8_t mid_buf[GSM48_MI_SIZE + 2]; + int mid_len = gsm48_generate_mid_from_imsi(mid_buf, params->imsi); + msgb_tlv_put(msg, GSM0808_IE_IMSI, mid_len - 2, mid_buf + 2); + } + + if (params->aoip_transport_layer) + gsm0808_enc_aoip_trasp_addr(msg, params->aoip_transport_layer); + + if (params->codec_list_msc_preferred) + gsm0808_enc_speech_codec_list(msg, params->codec_list_msc_preferred); + + if (params->call_id_present) { + uint8_t val[4]; + osmo_store32le(params->call_id, val); + msgb_tv_fixed_put(msg, GSM0808_IE_CALL_ID, 4, val); + } + + if (params->global_call_reference && params->global_call_reference_len) { + msgb_tlv_put(msg, GSM0808_IE_GLOBAL_CALL_REF, + params->global_call_reference_len, params->global_call_reference); + } + + /* prepend header with final length */ + msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + /*! Create BSSMAP HANDOVER REQUEST ACKNOWLEDGE message, 3GPP TS 48.008 3.2.1.10. * Sent from the MT BSC back to the MSC when it has allocated an lchan to handover to. * l3_info is the RR Handover Command that the MO BSC sends to the MS to move over. */ @@ -887,6 +1010,35 @@ struct msgb *gsm0808_create_handover_request_ack(const uint8_t *l3_info, uint8_t return msg; } +/*! Create BSSMAP HANDOVER COMMAND message, 3GPP TS 48.008 3.2.1.11. + * Sent from the MSC to the old BSS to transmit the RR Handover Command received from the new BSS. */ +struct msgb *gsm0808_create_handover_command(const struct gsm0808_handover_command *params) +{ + struct msgb *msg; + + msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "BSSMAP-HANDOVER-COMMAND"); + if (!msg) + return NULL; + + /* Message Type, 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_HANDOVER_CMD); + + msgb_tlv_put(msg, GSM0808_IE_LAYER_3_INFORMATION, params->l3_info_len, params->l3_info); + + if (params->cell_identifier.id_discr != CELL_IDENT_NO_CELL) + gsm0808_enc_cell_id(msg, ¶ms->cell_identifier); + + if (params->new_bss_to_old_bss_info_raw + && params->new_bss_to_old_bss_info_raw_len) + msgb_tlv_put(msg, GSM0808_IE_NEW_BSS_TO_OLD_BSS_INFO, params->new_bss_to_old_bss_info_raw_len, + params->new_bss_to_old_bss_info_raw); + + /* prepend header with final length */ + msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + /*! Create BSSMAP HANDOVER DETECT message, 3GPP TS 48.008 3.2.1.40. * Sent from the MT BSC back to the MSC when the MS has sent a handover RACH request and the MT BSC has * received the Handover Detect message. */ @@ -907,6 +1059,25 @@ struct msgb *gsm0808_create_handover_detect() return msg; } +/*! Create BSSMAP HANDOVER SUCCEEDED message, 3GPP TS 48.008 3.2.1.13. + * Sent from the MSC back to the old BSS to notify that the MS has successfully accessed the new BSS. */ +struct msgb *gsm0808_create_handover_succeeded() +{ + struct msgb *msg; + + msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "BSSMAP-HANDOVER-DETECT"); + if (!msg) + return NULL; + + /* Message Type, 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_HANDOVER_SUCCEEDED); + + /* prepend header with final length */ + msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + /*! Create BSSMAP HANDOVER COMPLETE message, 3GPP TS 48.008 3.2.1.12. * Sent from the MT BSC back to the MSC when the MS has fully settled into the new lchan. */ struct msgb *gsm0808_create_handover_complete(const struct gsm0808_handover_complete *params) -- cgit v1.2.3