diff options
Diffstat (limited to 'src/libmsc/gsm_04_80.c')
| -rw-r--r-- | src/libmsc/gsm_04_80.c | 79 |
1 files changed, 63 insertions, 16 deletions
diff --git a/src/libmsc/gsm_04_80.c b/src/libmsc/gsm_04_80.c index 8799fcbdc..32e8e23e0 100644 --- a/src/libmsc/gsm_04_80.c +++ b/src/libmsc/gsm_04_80.c @@ -59,10 +59,28 @@ static inline unsigned char *msgb_push_TLV1(struct msgb *msgb, uint8_t tag, return data; } +static inline unsigned char *msgb_push_NULL(struct msgb *msgb) +{ + uint8_t *data = msgb_push(msgb, 2); -/* Send response to a mobile-originated ProcessUnstructuredSS-Request */ + data[0] = ASN1_NULL_TYPE_TAG; + data[1] = 0; + return data; +} + + +/*! Send a MT RELEASE COMPLETE message with USSD-response, + * wrapped into the ReturnResult component (see section 3.6.1). + * + * \param[in] conn Active subscriber connection + * \param[in] transaction_id Transaction ID with TI flag set + * \param[in] invoke_id InvokeID of the request + * \param[in] response_text The response text + * \return result of \ref msc_tx_dtap + */ int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, - const char *response_text, const struct ss_request *req) + uint8_t transaction_id, uint8_t invoke_id, + const char *response_text) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD RSP"); struct gsm48_hdr *gh; @@ -91,7 +109,7 @@ int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, msgb_wrap_with_TL(msg, GSM_0480_SEQUENCE_TAG); /* Pre-pend the invoke ID */ - msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id); + msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, invoke_id); /* Wrap this up as a Return Result component */ msgb_wrap_with_TL(msg, GSM0480_CTYPE_RETURN_RESULT); @@ -101,15 +119,24 @@ int gsm0480_send_ussd_response(struct gsm_subscriber_connection *conn, /* And finally pre-pend the L3 header */ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh)); - gh->proto_discr = GSM48_PDISC_NC_SS | req->transaction_id - | (1<<7); /* TI direction = 1 */ + gh->proto_discr = GSM48_PDISC_NC_SS; + gh->proto_discr |= transaction_id << 4; gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; return msc_tx_dtap(conn, msg); } +/*! Send a MT RELEASE COMPLETE message with ReturnError component + * (see section 3.6.1) and given error code (see section 3.6.6). + * + * \param[in] conn Active subscriber connection + * \param[in] transaction_id Transaction ID with TI flag set + * \param[in] invoke_id InvokeID of the request + * \param[in] error_code Error code (section 4.5) + * \return result of \ref msc_tx_dtap + */ int gsm0480_send_ussd_return_error(struct gsm_subscriber_connection *conn, - const struct ss_request *req, uint8_t error_code) + uint8_t transaction_id, uint8_t invoke_id, uint8_t error_code) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD ERR"); struct gsm48_hdr *gh; @@ -118,7 +145,7 @@ int gsm0480_send_ussd_return_error(struct gsm_subscriber_connection *conn, msgb_push_TLV1(msg, GSM_0480_ERROR_CODE_TAG, error_code); /* Before it insert the invoke ID */ - msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id); + msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, invoke_id); /* Wrap this up as a Reject component */ msgb_wrap_with_TL(msg, GSM0480_CTYPE_RETURN_ERROR); @@ -128,25 +155,45 @@ int gsm0480_send_ussd_return_error(struct gsm_subscriber_connection *conn, /* And finally pre-pend the L3 header */ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh)); - gh->proto_discr = GSM48_PDISC_NC_SS; - gh->proto_discr |= req->transaction_id | (1<<7); /* TI direction = 1 */ + gh->proto_discr = GSM48_PDISC_NC_SS; + gh->proto_discr |= transaction_id << 4; gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; return msc_tx_dtap(conn, msg); } +/*! Send a MT RELEASE COMPLETE message with Reject component + * (see section 3.6.1) and given error code (see section 3.6.7). + * + * \param[in] conn Active subscriber connection + * \param[in] transaction_id Transaction ID with TI flag set + * \param[in] invoke_id InvokeID of the request + * \param[in] problem_tag Problem code tag (table 3.13) + * \param[in] problem_code Problem code (tables 3.14-17) + * \return result of \ref msc_tx_dtap + * + * Note: if InvokeID is not available, e.g. when message parsing + * failed, any incorrect value can be passed (0x00 > x > 0xff), so + * the universal NULL-tag (see table 3.6) will be used instead. + */ int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn, - const struct ss_request *req, - uint8_t error_tag, uint8_t error_code) + uint8_t transaction_id, int invoke_id, + uint8_t problem_tag, uint8_t problem_code) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USSD REJ"); struct gsm48_hdr *gh; /* First insert the problem code */ - msgb_push_TLV1(msg, error_tag, error_code); + msgb_push_TLV1(msg, problem_tag, problem_code); - /* Before it insert the invoke ID */ - msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, req->invoke_id); + /** + * If the Invoke ID is not available, Universal Null + * (table 3.9) with length = 0 shall be used. + */ + if (invoke_id < 0 || invoke_id > 255) + msgb_push_NULL(msg); + else + msgb_push_TLV1(msg, GSM0480_COMPIDTAG_INVOKE_ID, invoke_id); /* Wrap this up as a Reject component */ msgb_wrap_with_TL(msg, GSM0480_CTYPE_REJECT); @@ -156,8 +203,8 @@ int gsm0480_send_ussd_reject(struct gsm_subscriber_connection *conn, /* And finally pre-pend the L3 header */ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh)); - gh->proto_discr = GSM48_PDISC_NC_SS; - gh->proto_discr |= req->transaction_id | (1<<7); /* TI direction = 1 */ + gh->proto_discr = GSM48_PDISC_NC_SS; + gh->proto_discr |= transaction_id << 4; gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE; return msc_tx_dtap(conn, msg); |