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add support for gsm0808 HANDOVER REQUIRED message 

Related: OS#2283 (inter-BSC Handover, BSC side, MO)
Change-Id: Idb6dc3eab0282158a17091d97ed77c1e2e3eb3c2
This commit is contained in:
Neels Hofmeyr 2018-03-13 03:40:53 +01:00
parent 38e58416b1
commit 70aba3ffe2
4 changed files with 130 additions and 0 deletions
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37
include/osmocom/gsm/gsm0808.h
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@ -25,6 +25,7 @@
#include "tlv.h"
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <osmocom/gsm/gsm0808_utils.h>
#include <osmocom/gsm/gsm23003.h>
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);

22
include/osmocom/gsm/protocol/gsm_08_08.h
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@ -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,

70
src/gsm/gsm0808.c
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@ -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*)&params->cause);
/* Cell Identifier List, 3.2.2.27 */
gsm0808_enc_cell_id_list2(msg, &params->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, &params->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, &params->speech_version_used);
if (params->old_bss_to_new_bss_info_present)
put_old_bss_to_new_bss_information(msg, &params->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 */

1
src/gsm/libosmogsm.map
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@ -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;