pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/libosmo-sigtran/+/42029?usp=email )
Change subject: m3ua: Allow rx SCON in IPSP role
......................................................................
m3ua: Allow rx SCON in IPSP role
Change-Id: I49838219aab912243a761ab9b5167095e363c72b
---
M src/m3ua.c
1 file changed, 29 insertions(+), 1 deletion(-)
git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran
refs/changes/29/42029/1
diff --git a/src/m3ua.c b/src/m3ua.c
index f2844fa..afe75de 100644
--- a/src/m3ua.c
+++ b/src/m3ua.c
@@ -1107,6 +1107,34 @@
return rc;
}
+/* received SNM message on IPSP side
+ * xua is owned by parent call m3ua_rx_snm() */
+static int m3ua_rx_snm_ipsp(struct osmo_ss7_asp *asp, struct xua_msg *xua)
+{
+ struct osmo_ss7_as *as = NULL;
+ struct xua_msg_part *rctx_ie;
+ int rc = 0;
+
+ switch (xua->hdr.msg_type) {
+ case M3UA_SNM_SCON:
+ /* RFC4666 1.4.6: "The M3UA layer at an ASP or IPSP MAY
indicate local congestion
+ * to an M3UA peer with an SCON message."
+ * An IPSP can only be connected against another IPSP, hence if
an IPSP can send
+ * an SCON, it can be derived that it is expected it can
receive it: */
+ rctx_ie = xua_msg_find_tag(xua, M3UA_IEI_ROUTE_CTX);
+ rc = xua_find_as_for_asp(&as, asp, rctx_ie);
+ if (rc)
+ return rc;
+ xua_snm_rx_scon(asp, as, xua);
+ break;
+ default:
+ /* RFC 4666 Section 1.5.2: there is no MTP3 network management
status information */
+ return M3UA_ERR_UNSUPP_MSG_TYPE;
+ }
+
+ return rc;
+}
+
/* received SNM message
* This function takes ownership of xua msg passed to it. */
static int m3ua_rx_snm(struct osmo_ss7_asp *asp, struct xua_msg *xua)
@@ -1150,7 +1178,7 @@
rc = m3ua_rx_snm_asp(asp, xua);
break;
case OSMO_SS7_ASP_ROLE_IPSP:
- /* RFC 4666 Section 1.5.2: there is no MTP3 network management
status information */
+ rc = m3ua_rx_snm_ipsp(asp, xua);
default:
rc = M3UA_ERR_UNSUPP_MSG_CLASS;
break;
--
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Gerrit-MessageType: newchange
Gerrit-Project: libosmo-sigtran
Gerrit-Branch: master
Gerrit-Change-Id: I49838219aab912243a761ab9b5167095e363c72b
Gerrit-Change-Number: 42029
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <[email protected]>
