SMS over GSUP: implement forwarding of MO SMS
MO-forwardSM.req messages are now forwarded to a connected SMSC based on the SMSC address (SM-RP-DA) in the MO SM and the vty-defined mapping from SMSC numeric addresses to IPA names. Related: OS#6135 Depends: Iea5c29909c5be80f81dbbc2873656ff5cf590a5d (libosmocore) Change-Id: Iaad4531922c41583d261c79f42561a1bdbe03521
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@ -7,3 +7,4 @@
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# If any interfaces have been added since the last public release: c:r:a + 1.
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# If any interfaces have been removed or changed since the last public release: c:r:0.
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#library what description / commit summary line
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libosmogsm >1.9.0 <osmocom/gsm/protocol/gsm_04_11.h> additions
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@ -27,3 +27,5 @@ struct hlr_smsc_route *smsc_route_find(struct hlr *hlr, const char *num_addr);
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struct hlr_smsc_route *smsc_route_alloc(struct hlr *hlr, const char *num_addr,
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struct hlr_smsc *smsc);
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void smsc_route_free(struct hlr_smsc_route *rt);
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void forward_mo_sms(struct osmo_gsup_req *req);
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@ -49,6 +49,7 @@
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#include <osmocom/hlr/rand.h>
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#include <osmocom/hlr/hlr_vty.h>
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#include <osmocom/hlr/hlr_ussd.h>
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#include <osmocom/hlr/hlr_sms.h>
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#include <osmocom/hlr/dgsm.h>
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#include <osmocom/hlr/proxy.h>
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#include <osmocom/hlr/lu_fsm.h>
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@ -556,6 +557,9 @@ static int read_cb(struct osmo_gsup_conn *conn, struct msgb *msg)
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case OSMO_GSUP_MSGT_CHECK_IMEI_REQUEST:
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rx_check_imei_req(req);
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break;
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case OSMO_GSUP_MSGT_MO_FORWARD_SM_REQUEST:
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forward_mo_sms(req);
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break;
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default:
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LOGP(DMAIN, LOGL_DEBUG, "Unhandled GSUP message type %s\n",
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osmo_gsup_message_type_name(req->gsup.message_type));
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@ -26,6 +26,8 @@
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#include <osmocom/core/talloc.h>
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#include <osmocom/gsm/gsup.h>
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#include <osmocom/gsm/gsm48_ie.h>
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#include <osmocom/gsm/protocol/gsm_04_11.h>
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#include <osmocom/hlr/hlr.h>
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#include <osmocom/hlr/hlr_sms.h>
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@ -101,3 +103,90 @@ void smsc_route_free(struct hlr_smsc_route *rt)
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llist_del(&rt->list);
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talloc_free(rt);
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}
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/***********************************************************************
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* forwarding of MO SMS to SMSCs based on SM-RP-DA
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***********************************************************************/
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static const struct hlr_smsc *find_smsc_route(const char *smsc_addr)
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{
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const struct hlr_smsc_route *rt;
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rt = smsc_route_find(g_hlr, smsc_addr);
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if (rt)
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return rt->smsc;
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return g_hlr->smsc_default;
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}
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static void respond_with_sm_rp_cause(struct osmo_gsup_req *req,
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uint8_t sm_rp_cause)
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{
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struct osmo_gsup_message rsp_msg = { };
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rsp_msg.sm_rp_cause = &sm_rp_cause;
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osmo_gsup_req_respond(req, &rsp_msg, true, true);
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}
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/* Short Message from MSC/VLR towards SMSC */
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void forward_mo_sms(struct osmo_gsup_req *req)
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{
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uint8_t gsm48_decode_buffer[GSM411_SMSC_ADDR_MAX_OCTETS];
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char smsc_addr[GSM411_SMSC_ADDR_MAX_DIGITS+1];
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const struct hlr_smsc *smsc;
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struct osmo_cni_peer_id dest_peer;
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/* Make sure SM-RP-DA (SMSC address) is present */
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if (req->gsup.sm_rp_da == NULL || !req->gsup.sm_rp_da_len) {
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osmo_gsup_req_respond_err(req, GMM_CAUSE_INV_MAND_INFO,
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"missing SM-RP-DA");
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return;
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}
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if (req->gsup.sm_rp_da_type != OSMO_GSUP_SMS_SM_RP_ODA_SMSC_ADDR) {
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osmo_gsup_req_respond_err(req, GMM_CAUSE_INV_MAND_INFO,
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"SM-RP-DA type is not SMSC");
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return;
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}
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/* Enforce the length constrainst on SM-RP-DA, as specified in
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* GSM 04.11 section 8.2.5.2. Also enforce absence of ToN/NPI
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* extension octets at the same time. */
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if (req->gsup.sm_rp_da_len < GSM411_SMSC_ADDR_MIN_OCTETS ||
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req->gsup.sm_rp_da_len > GSM411_SMSC_ADDR_MAX_OCTETS ||
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!(req->gsup.sm_rp_da[0] & 0x80)) {
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/* This form of bogosity originates from the MS,
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* not from OsmoMSC or any other Osmocom network elements! */
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LOGP(DLSMS, LOGL_NOTICE,
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"Rx '%s' (IMSI-%s) contains invalid SM-RP-DA from MS\n",
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osmo_gsup_message_type_name(req->gsup.message_type),
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req->gsup.imsi);
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respond_with_sm_rp_cause(req, GSM411_RP_CAUSE_SEMANT_INC_MSG);
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return;
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}
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/* Decode SMSC address from SM-RP-DA */
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gsm48_decode_buffer[0] = req->gsup.sm_rp_da_len - 1;
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memcpy(gsm48_decode_buffer + 1, req->gsup.sm_rp_da + 1,
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req->gsup.sm_rp_da_len - 1);
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gsm48_decode_bcd_number2(smsc_addr, sizeof(smsc_addr),
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gsm48_decode_buffer,
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req->gsup.sm_rp_da_len, 0);
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/* Look for a route to this SMSC */
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smsc = find_smsc_route(smsc_addr);
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if (smsc == NULL) {
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LOGP(DLSMS, LOGL_NOTICE,
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"Failed to find a route for '%s' (IMSI-%s, SMSC-Addr-%s)\n",
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osmo_gsup_message_type_name(req->gsup.message_type),
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req->gsup.imsi, smsc_addr);
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respond_with_sm_rp_cause(req,
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GSM411_RP_CAUSE_MO_NUM_UNASSIGNED);
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return;
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}
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/* We got the IPA name of our SMSC - forward the message */
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osmo_cni_peer_id_set(&dest_peer, OSMO_CNI_PEER_ID_IPA_NAME,
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(const uint8_t *) smsc->name,
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strlen(smsc->name) + 1);
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osmo_gsup_forward_to_local_peer(req->cb_data, &dest_peer, req, NULL);
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}
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