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libmsc/gsm_04_80.c: add msc_send_ussd_release_complete_cause() 

According to GSM 04.80, section 2.5.1, Release complete message
may have an optional Cause IE. Let's add a new function, that
allows to specify cause location and value.

This function will be used by the upcoming changes.

Change-Id: I3b9e8e4f473d113d5b9e9e5d33f7914202077203
Depends Change-Id: (libosmocore) Ie3ac85fcef90a5e532334ba3482804d5305c88d7
This commit is contained in:
Vadim Yanitskiy 2019-02-06 17:54:21 +07:00
parent f20c6b7bd5
commit 3acfe68b8b
2 changed files with 31 additions and 0 deletions
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3
include/osmocom/msc/gsm_04_80.h
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@ -12,3 +12,6 @@ int msc_send_ussd_notify(struct ran_conn *conn, int level,
const char *text);
int msc_send_ussd_release_complete(struct ran_conn *conn,
uint8_t transaction_id);
int msc_send_ussd_release_complete_cause(struct ran_conn *conn,
uint8_t transaction_id,
uint8_t cause_loc, uint8_t cause_val);

28
src/libmsc/gsm_04_80.c
View File

@ -86,3 +86,31 @@ int msc_send_ussd_release_complete(struct ran_conn *conn,
return -1;
return msc_tx_dtap(conn, msg);
}
int msc_send_ussd_release_complete_cause(struct ran_conn *conn,
uint8_t transaction_id,
uint8_t cause_loc, uint8_t cause_val)
{
struct msgb *msg;
uint8_t *cause_ie;
msg = gsm0480_create_release_complete(transaction_id);
if (!msg)
return -1;
/* Encode cause IE (see GSM 04.08, section 10.5.4.11)
* with fixed length (2 bytes of TL, 2 bytes of payload).
* NOTE: we don't use gsm48_encode_cause() API because
* it wants gsm_mncc_cause struct from us. */
cause_ie = msgb_put(msg, 2 + 2);
cause_ie[0] = GSM48_IE_CAUSE;
cause_ie[1] = 2;
/* Coding standard defined for the GSM PLMNs,
* location and cause: as given by caller,
* no extension, no diagnostics. */
cause_ie[2] = (1 << 7) | (0x03 << 5) | (cause_loc & 0x0f);
cause_ie[3] = (1 << 7) | cause_val;
return msc_tx_dtap(conn, msg);
}