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gsm0808: Add gsm0808_create_common_id() 

This function encodes a GSM 08.08 / 48.008 "Common ID" message.

Change-Id: I353adc1aa72377f7d4b3336d2ff47791fb73d62c
Related: OS#2969
This commit is contained in:
Harald Welte 2020-06-21 22:04:52 +02:00
parent 17933347c5
commit 1bd726a2e4
4 changed files with 47 additions and 0 deletions
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1
TODO-RELEASE
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@ -13,3 +13,4 @@ sim API/ABI change all over the place
gsm new API new osmo_bts_unset_feature()
gb API/ABI change deprecate gprs_nsvc_crate(); export gprs_nsvc_create2()
gsm API/ABI change add new member to lapd_datalink
gsm new API new gsm0808_create_common_id()

3
include/osmocom/gsm/gsm0808.h
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@ -104,6 +104,9 @@ struct msgb *gsm0808_create_lcls_conn_ctrl(enum gsm0808_lcls_config config,
enum gsm0808_lcls_control control);
struct msgb *gsm0808_create_lcls_conn_ctrl_ack(enum gsm0808_lcls_status status);
struct msgb *gsm0808_create_lcls_notification(enum gsm0808_lcls_status status, bool break_req);
struct msgb *gsm0808_create_common_id(const char *imsi,
const struct osmo_plmn_id *selected_plmn_id,
const struct osmo_plmn_id *last_used_eutran_plnm_id);
/*! 3GPP TS 48.008 §3.2.2.5.8 Old BSS to New BSS information */

42
src/gsm/gsm0808.c
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@ -1235,6 +1235,48 @@ struct msgb *gsm0808_create_handover_performed(const struct gsm0808_handover_per
return msg;
}
struct msgb *gsm0808_create_common_id(const char *imsi,
const struct osmo_plmn_id *selected_plmn_id,
const struct osmo_plmn_id *last_used_eutran_plnm_id)
{
struct msgb *msg;
uint8_t mid_buf[GSM48_MI_SIZE + 2];
uint8_t *out;
int mid_len;
msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM, "COMMON-ID");
if (!msg)
return NULL;
/* Message Type, 3.2.2.1 */
msgb_v_put(msg, BSS_MAP_MSG_COMMON_ID);
/* mandatory IMSI 3.2.2.6 */
mid_len = gsm48_generate_mid_from_imsi(mid_buf, imsi);
msgb_tlv_put(msg, GSM0808_IE_IMSI, mid_len - 2, mid_buf + 2);
/* not implemented: SNA Access Information */
/* Selected PLMN ID */
if (selected_plmn_id) {
msgb_v_put(msg, GSM0808_IE_SELECTED_PLMN_ID);
out = msgb_put(msg, 3);
osmo_plmn_to_bcd(out, selected_plmn_id);
}
/* Last used E-UTRAN PLMN ID */
if (last_used_eutran_plnm_id) {
msgb_v_put(msg, GSM0808_IE_LAST_USED_EUTRAN_PLMN_ID);
out = msgb_put(msg, 3);
osmo_plmn_to_bcd(out, last_used_eutran_plnm_id);
}
/* prepend header with final length */
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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@ -202,6 +202,7 @@ gsm0808_create_handover_succeeded;
gsm0808_create_handover_complete;
gsm0808_create_handover_failure;
gsm0808_create_handover_performed;
gsm0808_create_common_id;
gsm0808_prepend_dtap_header;
gsm0808_enc_cause;
gsm0808_enc_aoip_trasp_addr;