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authorVadim Yanitskiy <axilirator@gmail.com>2018-04-07 02:34:55 +0700
committerVadim Yanitskiy <axilirator@gmail.com>2018-05-31 16:11:14 +0000
commit72696040dfac41512c672f71f2b3712656641a7f (patch)
treef3624970fb112e54df0a528233420b4fb3c6c736 /include
parent64e807c4bc81624651b970290db1c6a0b03d8eef (diff)
GSUP: implement TCAP-like session management
Unlike TCAP/MAP, GSUP is just a transport layer without the dialogue/context. This prevents us from having session based communication, required e.g. for USSD. But we can emulate TCAP dialogue by adding additional IEs, which would allow to relate each message to a particular session. This change introduces the following IEs: - OSMO_GSUP_SESSION_ID_IE, - OSMO_GSUP_SESSION_STATE_IE, which optionally can be used to indicate that the message is related to a session with given ID, and to manage session state, i.e. initiate, continue, and finish. Change-Id: I1cee271fed0284a134ffed103c0d4bebbcfde2a8 Related: OS#1597
Diffstat (limited to 'include')
-rw-r--r--include/osmocom/gsm/gsup.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/osmocom/gsm/gsup.h b/include/osmocom/gsm/gsup.h
index a7fa8208..5f456991 100644
--- a/include/osmocom/gsm/gsup.h
+++ b/include/osmocom/gsm/gsup.h
@@ -82,6 +82,9 @@ enum osmo_gsup_iei {
OSMO_GSUP_AUTS_IE = 0x26,
OSMO_GSUP_RES_IE = 0x27,
OSMO_GSUP_CN_DOMAIN_IE = 0x28,
+
+ OSMO_GSUP_SESSION_ID_IE = 0x30,
+ OSMO_GSUP_SESSION_STATE_IE = 0x31,
};
/*! GSUP message type */
@@ -132,6 +135,18 @@ enum osmo_gsup_cn_domain {
OSMO_GSUP_CN_DOMAIN_CS = 2,
};
+/*! TCAP-like session state */
+enum osmo_gsup_session_state {
+ /*! Undefined session state */
+ OSMO_GSUP_SESSION_STATE_NONE = 0x00,
+ /*! Initiation of a new session */
+ OSMO_GSUP_SESSION_STATE_BEGIN = 0x01,
+ /*! Communication of an existing session */
+ OSMO_GSUP_SESSION_STATE_CONTINUE = 0x02,
+ /*! Indication of the session end */
+ OSMO_GSUP_SESSION_STATE_END = 0x03,
+};
+
/*! parsed/decoded PDP context information */
struct osmo_gsup_pdp_info {
unsigned int context_id;
@@ -176,6 +191,12 @@ struct osmo_gsup_message {
enum osmo_gsup_cn_domain cn_domain;
const uint8_t *pdp_charg_enc;
size_t pdp_charg_enc_len;
+
+ /*! Session state \ref osmo_gsup_session_state */
+ enum osmo_gsup_session_state session_state;
+ /*! Unique session identifier and origination flag.
+ * Encoded only when \ref session_state != 0x00 */
+ uint32_t session_id;
};
int osmo_gsup_decode(const uint8_t *data, size_t data_len,