gsm0808: Add gsm0808_create_common_id()
This function encodes a GSM 08.08 / 48.008 "Common ID" message.
Change-Id: I353adc1aa72377f7d4b3336d2ff47791fb73d62c
Related: OS#2969
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index 9fdf379..e1db175 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -1235,6 +1235,48 @@
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 */
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 742cec3..713ffe3 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -202,6 +202,7 @@
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;