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-rw-r--r--openbsc/include/openbsc/gsm_04_08_gprs.h15
-rw-r--r--openbsc/src/gprs/gprs_gmm.c156
-rw-r--r--openbsc/src/gprs/gsm_04_08_gprs.c10
3 files changed, 181 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/gsm_04_08_gprs.h b/openbsc/include/openbsc/gsm_04_08_gprs.h
index f35d11b60..d122274ed 100644
--- a/openbsc/include/openbsc/gsm_04_08_gprs.h
+++ b/openbsc/include/openbsc/gsm_04_08_gprs.h
@@ -17,6 +17,11 @@
#define GSM48_MT_GMM_RA_UPD_COMPL 0x0a
#define GSM48_MT_GMM_RA_UPD_REJ 0x0b
+/* Table 10.4 in 3GPP TS 24.008 (successor to 04.08) */
+#define GSM48_MT_GMM_SERVICE_REQ 0x0c
+#define GSM48_MT_GMM_SERVICE_ACK 0x0d
+#define GSM48_MT_GMM_SERVICE_REJ 0x0e
+
#define GSM48_MT_GMM_PTMSI_REALL_CMD 0x10
#define GSM48_MT_GMM_PTMSI_REALL_COMPL 0x11
#define GSM48_MT_GMM_AUTH_CIPH_REQ 0x12
@@ -393,5 +398,15 @@ struct gsm48_qos {
uint8_t guar_bitrate_down_ext;
};
+/* 3GPP 24.008 / Chapter 10.5.5.20 / Table 10.5.153a */
+enum gsm48_gmm_service_type {
+ GPRS_SERVICE_T_SIGNALLING = 0x00,
+ GPRS_SERVICE_T_DATA = 0x01,
+ GPRS_SERVICE_T_PAGING_RESP = 0x02,
+ GPRS_SERVICE_T_MBMS_MC_SERV = 0x03,
+ GPRS_SERVICE_T_MBMS_BC_SERV = 0x04,
+};
+
+extern const struct value_string *gprs_service_t_strs;
#endif /* _GSM48_GPRS_H */
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 171b34bbb..e31137ffa 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -1334,6 +1334,159 @@ rejected:
return rc;
}
+/* Chapter 9.4.21: Service accept */
+static int gsm48_tx_gmm_service_ack(struct sgsn_mm_ctx *mm)
+{
+ struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE ACK");
+ struct gsm48_hdr *gh;
+
+ LOGMMCTXP(LOGL_INFO, mm, "<- GPRS SERVICE ACCEPT (P-TMSI=0x%08x)\n", mm->p_tmsi);
+
+ mmctx2msgid(msg, mm);
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_MM_GPRS;
+ gh->msg_type = GSM48_MT_GMM_SERVICE_ACK;
+
+ /* Optional: PDP context status */
+ /* Optional: MBMS context status */
+
+ return gsm48_gmm_sendmsg(msg, 0, mm);
+}
+
+/* Chapter 9.4.22: Service reject */
+static int _tx_gmm_service_rej(struct msgb *msg, uint8_t gmm_cause,
+ const struct sgsn_mm_ctx *mm)
+{
+ struct gsm48_hdr *gh;
+
+ LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS SERVICE REJECT: %s\n",
+ get_value_string(gsm48_gmm_cause_names, gmm_cause));
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_MM_GPRS;
+ gh->msg_type = GSM48_MT_GMM_SERVICE_REJ;
+ gh->data[0] = gmm_cause;
+
+ return gsm48_gmm_sendmsg(msg, 0, NULL);
+}
+static int gsm48_tx_gmm_service_rej_oldmsg(const struct msgb *old_msg,
+ uint8_t gmm_cause)
+{
+ struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ OLD");
+ gmm_copy_id(msg, old_msg);
+ return _tx_gmm_service_rej(msg, gmm_cause, NULL);
+}
+static int gsm48_tx_gmm_service_rej(struct sgsn_mm_ctx *mm,
+ uint8_t gmm_cause)
+{
+ struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ");
+ mmctx2msgid(msg, mm);
+ return _tx_gmm_service_rej(msg, gmm_cause, mm);
+}
+
+/* 3GPP TS 24.008 Section 9.4.20 Service request */
+static int gsm48_rx_gmm_service_req(struct sgsn_mm_ctx *ctx, struct msgb *msg)
+{
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
+ uint8_t *cur = gh->data, *mi;
+ uint8_t ciph_seq_nr, service_type, mi_len, mi_type;
+ uint32_t tmsi;
+ struct tlv_parsed tp;
+ char mi_string[GSM48_MI_SIZE];
+ uint16_t cid = 0;
+ enum gsm48_gmm_cause reject_cause;
+ int rc;
+
+ LOGMMCTXP(LOGL_INFO, ctx, "-> GMM SERVICE REQUEST ");
+
+ /* This message is only valid in Iu mode */
+ if (!msg->dst)
+ return -1;
+
+ /* Skip Ciphering key sequence number 10.5.1.2 */
+ ciph_seq_nr = *cur & 0x07;
+
+ /* Service type 10.5.5.20 */
+ service_type = (*cur++ >> 4) & 0x07;
+
+ /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */
+ mi_len = *cur++;
+ mi = cur;
+ if (mi_len > 8)
+ goto err_inval;
+ mi_type = *mi & GSM_MI_TYPE_MASK;
+ cur += mi_len;
+
+ gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
+
+ DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string,
+ get_value_string(gprs_service_t_strs, service_type));
+
+ LOGPC(DMM, LOGL_INFO, "\n");
+
+ /* Optional: PDP context status, MBMS context status, Uplink data status, Device properties */
+ tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0);
+
+ switch (mi_type) {
+ case GSM_MI_TYPE_IMSI:
+ /* Try to find MM context based on IMSI */
+ if (!ctx)
+ ctx = sgsn_mm_ctx_by_imsi(mi_string);
+ if (!ctx) {
+ /* FIXME: We need to have a context for service request? */
+ reject_cause = GMM_CAUSE_NET_FAIL;
+ goto rejected;
+ }
+ msgid2mmctx(ctx, msg);
+ break;
+ case GSM_MI_TYPE_TMSI:
+ memcpy(&tmsi, mi+1, 4);
+ tmsi = ntohl(tmsi);
+ /* Try to find MM context based on P-TMSI */
+ if (!ctx)
+ ctx = sgsn_mm_ctx_by_ptmsi(tmsi);
+ if (!ctx) {
+ /* FIXME: We need to have a context for service request? */
+ reject_cause = GMM_CAUSE_NET_FAIL;
+ goto rejected;
+ }
+ msgid2mmctx(ctx, msg);
+ break;
+ default:
+ LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting SERVICE REQUEST with "
+ "MI type %s\n", gsm48_mi_type_name(mi_type));
+ reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED;
+ goto rejected;
+ }
+
+ /* Look at PDP Context Status IE and see if MS's view of
+ * activated/deactivated NSAPIs agrees with our view */
+ if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) {
+ const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS);
+ process_ms_ctx_status(ctx, pdp_status);
+ }
+
+
+ ctx->pending_req = GSM48_MT_GMM_SERVICE_REQ;
+ return gsm48_gmm_authorize(ctx);
+
+err_inval:
+ LOGPC(DMM, LOGL_INFO, "\n");
+ reject_cause = GMM_CAUSE_SEM_INCORR_MSG;
+
+rejected:
+ /* Send SERVICE REJECT */
+ LOGMMCTXP(LOGL_NOTICE, ctx,
+ "Rejecting Service Request with cause '%s' (%d)\n",
+ get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause);
+ rc = gsm48_tx_gmm_service_rej_oldmsg(msg, reject_cause);
+
+ return rc;
+
+}
+
+
static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
@@ -1402,6 +1555,9 @@ static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg,
case GSM48_MT_GMM_ATTACH_REQ:
rc = gsm48_rx_gmm_att_req(mmctx, msg, llme);
break;
+ case GSM48_MT_GMM_SERVICE_REQ:
+ rc = gsm48_rx_gmm_service_req(mmctx, msg);
+ break;
default:
break;
}
diff --git a/openbsc/src/gprs/gsm_04_08_gprs.c b/openbsc/src/gprs/gsm_04_08_gprs.c
index 3ae50e26c..ed0172862 100644
--- a/openbsc/src/gprs/gsm_04_08_gprs.c
+++ b/openbsc/src/gprs/gsm_04_08_gprs.c
@@ -139,3 +139,13 @@ const struct value_string gprs_det_t_mt_strs_[] = {
const struct value_string *gprs_det_t_mt_strs = gprs_det_t_mt_strs_;
+const struct value_string gprs_service_t_strs_[] = {
+ { GPRS_SERVICE_T_SIGNALLING, "signalling" },
+ { GPRS_SERVICE_T_DATA, "data" },
+ { GPRS_SERVICE_T_PAGING_RESP, "paging response" },
+ { GPRS_SERVICE_T_MBMS_MC_SERV, "MBMS multicast service" },
+ { GPRS_SERVICE_T_MBMS_BC_SERV, "MBMS broadcast service" },
+ { 0, NULL }
+};
+
+const struct value_string *gprs_service_t_strs = gprs_service_t_strs_;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 09:30:01 +0000