From 70aba3ffe2e6dbff4b8bf17c0f1273d8b4387109 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Tue, 13 Mar 2018 03:40:53 +0100 Subject: add support for gsm0808 HANDOVER REQUIRED message Related: OS#2283 (inter-BSC Handover, BSC side, MO) Change-Id: Idb6dc3eab0282158a17091d97ed77c1e2e3eb3c2 --- include/osmocom/gsm/gsm0808.h | 37 +++++++++++++++++ include/osmocom/gsm/protocol/gsm_08_08.h | 22 ++++++++++ src/gsm/gsm0808.c | 70 ++++++++++++++++++++++++++++++++ src/gsm/libosmogsm.map | 1 + 4 files changed, 130 insertions(+) diff --git a/include/osmocom/gsm/gsm0808.h b/include/osmocom/gsm/gsm0808.h index 369d713c..4f239e66 100644 --- a/include/osmocom/gsm/gsm0808.h +++ b/include/osmocom/gsm/gsm0808.h @@ -25,6 +25,7 @@ #include "tlv.h" #include +#include #include struct sockaddr_storage; @@ -80,6 +81,42 @@ struct msgb *gsm0808_create_paging(const char *imsi, const uint32_t *tmsi, const uint8_t *chan_needed) OSMO_DEPRECATED("use gsm0808_create_paging2 instead"); +/*! 3GPP TS 48.008 §3.2.2.5.8 Old BSS to New BSS information */ +struct gsm0808_old_bss_to_new_bss_info { + bool extra_information_present; + struct { + bool prec; + bool lcs; + bool ue_prob; + } extra_information; + + bool current_channel_type_2_present; + struct { + uint8_t mode; + uint8_t field; + } current_channel_type_2; + + /* more items are defined in the spec and may be added later */ +}; + +/*! 3GPP TS 48.008 §3.2.1.9 HANDOVER REQUIRED */ +struct gsm0808_handover_required { + uint16_t cause; + struct gsm0808_cell_id_list2 cil; + + bool current_channel_type_1_present; + uint8_t current_channel_type_1; + + bool speech_version_used_present; + uint8_t speech_version_used; + + bool old_bss_to_new_bss_info_present; + struct gsm0808_old_bss_to_new_bss_info old_bss_to_new_bss_info; + + /* more items are defined in the spec and may be added later */ +}; +struct msgb *gsm0808_create_handover_required(const struct gsm0808_handover_required *params); + struct msgb *gsm0808_create_dtap(struct msgb *msg, uint8_t link_id); void gsm0808_prepend_dtap_header(struct msgb *msg, uint8_t link_id); diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h index b699080c..60b96812 100644 --- a/include/osmocom/gsm/protocol/gsm_08_08.h +++ b/include/osmocom/gsm/protocol/gsm_08_08.h @@ -295,6 +295,28 @@ enum GSM0808_IE_CODING { GSM0808_IE_LAST_USED_EUTRAN_PLMN_ID = 0x95, }; +/* 3GPP TS 48.008 3.2.3 Signalling Field Element Coding */ +enum GSM0808_SIGNALLING_FIELD_ELEMENT_CODING { + GSM0808_FE_IE_EXTRA_INFORMATION = 0x01, /*< 3.2.3.1 */ + GSM0808_FE_IE_CURRENT_CHANNEL_TYPE_2 = 0x02, /*< 3.2.3.2 */ + GSM0808_FE_IE_TARGET_CELL_RADIO_INFORMATION = 0x03, /*< 3.2.3.3 */ + GSM0808_FE_IE_GPRS_SUSPEND_INFORMATION = 0x04, /*< 3.2.3.4 */ + GSM0808_FE_IE_MULTIRATE_CONFIGURATION_INFORMATION = 0x05, /*< 3.2.3.5 */ + GSM0808_FE_IE_DUAL_TRANSFER_MODE_INFORMATION = 0x06, /*< 3.2.3.6 */ + GSM0808_FE_IE_INTER_RAT_HANDOVER_INFO = 0x07, /*< 3.2.3.7 */ + GSM0808_FE_IE_CDMA2000_CAPABILITY_INFORMATION = 0x08, /*< 3.2.3.8 */ + GSM0808_FE_IE_DOWNLINK_CELL_LOAD_INFORMATION = 0x09, /*< 3.2.3.9 */ + GSM0808_FE_IE_UPLINK_CELL_LOAD_INFORMATION = 0x0a, /*< 3.2.3.10 */ + GSM0808_FE_IE_CELL_LOAD_INFORMATION_GROUP = 0x0b, /*< 3.2.3.11 */ + GSM0808_FE_IE_CELL_LOAD_INFORMATION = 0x0c, /*< 3.2.3.12 */ + GSM0808_FE_IE_PS_INDICATION = 0x0d, /*< 3.2.3.13 */ + GSM0808_FE_IE_DTM_HANDOVER_COMMAND_INDICATION = 0x0e, /*< 3.2.3.14 */ + GSM0808_FE_IE_D_RNTI = 0xfe, /*< 3.2.3.15 */ + GSM0808_FE_IE_IRAT_MEASUREMENT_CONFIGURATION = 0x0f, /*< 3.2.3.16 */ + GSM0808_FE_IE_SOURCE_CELL_ID = 0x10, /*< 3.2.3.17 */ + GSM0808_FE_IE_IRAT_MEASUREMENT_CONFIGURATION_EXTENDED_E_ARFCNS = 0x11, /*< 3.2.3.18 */ +}; + /* GSM 08.08 3.2.2.5 Cause */ enum gsm0808_cause { GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE = 0, diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c index 47431756..80f5e6ce 100644 --- a/src/gsm/gsm0808.c +++ b/src/gsm/gsm0808.c @@ -609,6 +609,76 @@ struct msgb *gsm0808_create_paging(const char *imsi, const uint32_t *tmsi, return gsm0808_create_paging2(imsi, tmsi, &cil2, chan_needed); } +static uint8_t put_old_bss_to_new_bss_information(struct msgb *msg, + const struct gsm0808_old_bss_to_new_bss_info *i) +{ + uint8_t *old_tail; + uint8_t *tlv_len; + + msgb_put_u8(msg, GSM0808_IE_OLD_BSS_TO_NEW_BSS_INFORMATION); + tlv_len = msgb_put(msg, 1); + old_tail = msg->tail; + + if (i->extra_information_present) { + uint8_t val = 0; + if (i->extra_information.prec) + val |= 1 << 0; + if (i->extra_information.lcs) + val |= 1 << 1; + if (i->extra_information.ue_prob) + val |= 1 << 2; + msgb_tlv_put(msg, GSM0808_FE_IE_EXTRA_INFORMATION, 1, &val); + } + + if (i->current_channel_type_2_present) { + uint8_t val[2] = { + i->current_channel_type_2.mode, + i->current_channel_type_2.field, + }; + msgb_tlv_put(msg, GSM0808_FE_IE_CURRENT_CHANNEL_TYPE_2, 2, val); + } + + *tlv_len = (uint8_t) (msg->tail - old_tail); + return *tlv_len + 2; +} + +/*! Create BSSMAP HANDOVER REQUIRED message. + * \param[in] params All information to be encoded. + * \returns newly allocated msgb with BSSMAP REQUIRED message. */ +struct msgb *gsm0808_create_handover_required(const struct gsm0808_handover_required *params) +{ + struct msgb *msg; + + msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "BSSMAP-HANDOVER-REQUIRED"); + if (!msg) + return NULL; + + /* Message Type, 3.2.2.1 */ + msgb_v_put(msg, BSS_MAP_MSG_HANDOVER_REQUIRED); + + /* Cause, 3.2.2.5 */ + msgb_tlv_put(msg, GSM0808_IE_CAUSE, params->cause & 0x80? 2 : 1, (const uint8_t*)¶ms->cause); + + /* Cell Identifier List, 3.2.2.27 */ + gsm0808_enc_cell_id_list2(msg, ¶ms->cil); + + /* 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_present) + msgb_tv_fixed_put(msg, GSM0808_IE_SPEECH_VERSION, 1, ¶ms->speech_version_used); + + if (params->old_bss_to_new_bss_info_present) + put_old_bss_to_new_bss_information(msg, ¶ms->old_bss_to_new_bss_info); + + /* pre-pend the header */ + msg->l3h = msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg)); + + return msg; +} + /*! Prepend a DTAP header to given Message Buffer * \param[in] msgb Message Buffer * \param[in] link_id Link Identifier */ diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index 5a574290..58a5bfe5 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -161,6 +161,7 @@ gsm0808_create_layer3_2; gsm0808_create_reset; gsm0808_create_reset_ack; gsm0808_create_sapi_reject; +gsm0808_create_handover_required; gsm0808_prepend_dtap_header; gsm0808_enc_aoip_trasp_addr; gsm0808_dec_aoip_trasp_addr; -- cgit v1.2.3