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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 /src
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 'src')
-rw-r--r--src/gsm/gsup.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/gsm/gsup.c b/src/gsm/gsup.c
index b6ac56d9..8663f449 100644
--- a/src/gsm/gsup.c
+++ b/src/gsm/gsup.c
@@ -385,6 +385,14 @@ int osmo_gsup_decode(const uint8_t *const_data, size_t data_len,
gsup_msg->pdp_charg_enc_len = value_len;
break;
+ case OSMO_GSUP_SESSION_ID_IE:
+ gsup_msg->session_id = osmo_decode_big_endian(value, value_len);
+ break;
+
+ case OSMO_GSUP_SESSION_STATE_IE:
+ gsup_msg->session_state = *value;
+ break;
+
default:
LOGP(DLGSUP, LOGL_NOTICE,
"GSUP IE type %d unknown\n", iei);
@@ -564,6 +572,14 @@ int osmo_gsup_encode(struct msgb *msg, const struct osmo_gsup_message *gsup_msg)
gsup_msg->pdp_charg_enc_len, gsup_msg->pdp_charg_enc);
}
+ if ((u8 = gsup_msg->session_state)) {
+ size_t len = sizeof(gsup_msg->session_id);
+ uint8_t *sid = osmo_encode_big_endian(gsup_msg->session_id, len);
+
+ msgb_tlv_put(msg, OSMO_GSUP_SESSION_ID_IE, len, sid);
+ msgb_tlv_put(msg, OSMO_GSUP_SESSION_STATE_IE, sizeof(u8), &u8);
+ }
+
return 0;
}