diff options
| -rw-r--r-- | src/sccp_scrc.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/sccp_scrc.c b/src/sccp_scrc.c index b46b4f2..1da3890 100644 --- a/src/sccp_scrc.c +++ b/src/sccp_scrc.c @@ -440,6 +440,26 @@ int sccp_scrc_rx_sclc_msg(struct osmo_sccp_instance *inst, return scrc_local_out_common(inst, xua, &called); } +/* ensure the CallingParty address doesn't just contain SSN, but at least SSN+PC */ +static void ensure_opc_in_calling_ssn(struct osmo_sccp_instance *inst, + struct xua_msg *xua) +{ + struct osmo_sccp_addr calling; + + sua_addr_parse(&calling, xua, SUA_IEI_SRC_ADDR); + + /* if we route on SSN and only have a SSN in the address... */ + if (calling.ri == OSMO_SCCP_RI_SSN_PC && + calling.presence == OSMO_SCCP_ADDR_T_SSN) { + /* add the M3UA OPC to the address to ensure that the recipient + * can actually respond back to the source */ + calling.presence |= OSMO_SCCP_ADDR_T_PC; + calling.pc = xua->mtp.opc; + xua_msg_free_tag(xua, SUA_IEI_SRC_ADDR); + xua_msg_add_sccp_addr(xua, SUA_IEI_SRC_ADDR, &calling); + } +} + /* Figure C.1/Q.714 Sheet 1 of 12, after we converted the * MTP-TRANSFER.ind to SUA. */ int scrc_rx_mtp_xfer_ind_xua(struct osmo_sccp_instance *inst, @@ -461,6 +481,9 @@ int scrc_rx_mtp_xfer_ind_xua(struct osmo_sccp_instance *inst, } /* We only treat connectionless and CR below */ + /* ensure we have at least OPC+SSN and not just SSN in CallingParty (OS#5146) */ + ensure_opc_in_calling_ssn(inst, xua); + sua_addr_parse(&called, xua, SUA_IEI_DEST_ADDR); /* Route on GT? */ |