From 1bd726a2e4eaf7f4bd721dec7602bbe754eed693 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 21 Jun 2020 22:04:52 +0200 Subject: gsm0808: Add gsm0808_create_common_id() This function encodes a GSM 08.08 / 48.008 "Common ID" message. Change-Id: I353adc1aa72377f7d4b3336d2ff47791fb73d62c Related: OS#2969 --- src/gsm/gsm0808.c | 42 ++++++++++++++++++++++++++++++++++++++++++ src/gsm/libosmogsm.map | 1 + 2 files changed, 43 insertions(+) (limited to 'src/gsm') diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c index 9fdf3794..e1db175f 100644 --- a/src/gsm/gsm0808.c +++ b/src/gsm/gsm0808.c @@ -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 */ diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index 742cec38..713ffe3e 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -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; -- cgit v1.2.3