gsm0808: Add create functions for BSS_MAP_MSG_ASSIGMENT_RQST
gsm0808.h/c lacks functionality to generate BSS_MAP_MSG_ASSIGMENT_RQST messages.
These messages are required if the code is used in an MSC implementation.
This commit adds a gsm0808_create_assignment() function, that generates an
A/AoiP BSS_MAP_MSG_PAGING message.
Change-Id: I4d1d455a1e1cf95407e23ded7b7defbcf2dd6ff0
diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index 2721a1b..be58939 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -238,6 +238,62 @@
return msg;
}
+struct msgb *gsm0808_create_ass(const struct gsm0808_channel_type *ct,
+ const uint16_t *cic,
+ const struct sockaddr_storage *ss,
+ const struct gsm0808_speech_codec_list *scl,
+ const uint32_t *ci)
+{
+ /* See also: 3GPP TS 48.008 3.2.1.1 ASSIGNMENT REQUEST */
+ struct msgb *msg;
+ uint16_t cic_sw;
+ uint32_t ci_sw;
+
+ /* Mandatory emelent! */
+ OSMO_ASSERT(ct);
+
+ msg =
+ msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+ "bssmap: ass req");
+ if (!msg)
+ return NULL;
+
+ /* Message Type 3.2.2.1 */
+ msgb_v_put(msg, BSS_MAP_MSG_ASSIGMENT_RQST);
+
+ /* Channel Type 3.2.2.11 */
+ gsm0808_enc_channel_type(msg, ct);
+
+ /* Circuit Identity Code 3.2.2.2 */
+ if (cic) {
+ cic_sw = htons(*cic);
+ msgb_tv_fixed_put(msg, GSM0808_IE_CIRCUIT_IDENTITY_CODE,
+ sizeof(cic_sw), (uint8_t *) & cic_sw);
+ }
+
+ /* AoIP: AoIP Transport Layer Address (MGW) 3.2.2.102 */
+ if (ss) {
+ gsm0808_enc_aoip_trasp_addr(msg, ss);
+ }
+
+ /* AoIP: Codec List (MSC Preferred) 3.2.2.103 */
+ if (scl)
+ gsm0808_enc_speech_codec_list(msg, scl);
+
+ /* AoIP: Call Identifier 3.2.2.105 */
+ if (ci) {
+ ci_sw = htonl(*ci);
+ msgb_tv_fixed_put(msg, GSM0808_IE_CALL_ID, sizeof(ci_sw),
+ (uint8_t *) & ci_sw);
+ }
+
+ /* push the bssmap header */
+ msg->l3h =
+ msgb_tv_push(msg, BSSAP_MSG_BSS_MANAGEMENT, msgb_length(msg));
+
+ return msg;
+}
+
struct msgb *gsm0808_create_ass_compl(uint8_t rr_cause, uint8_t chosen_channel,
uint8_t encr_alg_id, uint8_t speech_mode,
const struct sockaddr_storage *ss,
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index ec23418..a4e6083 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -124,6 +124,7 @@
gsm0808_att_tlvdef;
gsm0808_bssap_name;
gsm0808_bssmap_name;
+gsm0808_create_ass;
gsm0808_create_assignment_completed;
gsm0808_create_ass_compl;
gsm0808_create_assignment_failure;