bssgp_rim: move bssgp_parse_rim_ri and bssgp_create_rim_ri to gprs_bssgp_rim
The function bssgp_parse_rim_ri() and bssgp_create_rim_ri() are located
in gprs_bssgp.c, since there is now a gprs_bssgp_rim.c module it makes
more sense to put them there. Also adjust the code a bit so that its
more intuitive to read.
Change-Id: Icd667f41d5735de56cd9fb257670337c679dd258
Related: SYS#5103
diff --git a/src/gb/gprs_bssgp_rim.c b/src/gb/gprs_bssgp_rim.c
index 3ac405e..0dc6d21 100644
--- a/src/gb/gprs_bssgp_rim.c
+++ b/src/gb/gprs_bssgp_rim.c
@@ -41,6 +41,97 @@
* (3GPP TS 48.018, sub-clause 11.3.9) but without IE and length octets. */
#define REP_CELL_ID_LEN 8
+/*! Parse a RIM Routing information IE (3GPP TS 48.018, chapter 11.3.70).
+ * \param[out] ri user provided memory to store the parsed results.
+ * \param[in] buf input buffer of the value part of the IE.
+ * \returns length of parsed octets, -EINVAL on error. */
+int bssgp_parse_rim_ri(struct bssgp_rim_routing_info *ri, const uint8_t *buf,
+ unsigned int len)
+{
+ struct gprs_ra_id raid_temp;
+
+ memset(ri, 0, sizeof(*ri));
+ if (len < 2)
+ return -EINVAL;
+
+ ri->discr = buf[0] & 0x0f;
+ buf++;
+
+ switch (ri->discr) {
+ case BSSGP_RIM_ROUTING_INFO_GERAN:
+ if (len < 9)
+ return -EINVAL;
+ ri->geran.cid = bssgp_parse_cell_id(&ri->geran.raid, buf);
+ return 9;
+ case BSSGP_RIM_ROUTING_INFO_UTRAN:
+ if (len < 9)
+ return -EINVAL;
+ gsm48_parse_ra(&ri->utran.raid, buf);
+ ri->utran.rncid = osmo_load16be(buf + 6);
+ return 9;
+ case BSSGP_RIM_ROUTING_INFO_EUTRAN:
+ if (len < 7 || len > 14)
+ return -EINVAL;
+ /* Note: 3GPP TS 24.301 Figure 9.9.3.32.1 and 3GPP TS 24.008
+ * Figure 10.5.130 specify MCC/MNC encoding in the same way,
+ * so we can re-use gsm48_parse_ra() for that. */
+ gsm48_parse_ra(&raid_temp, buf);
+ ri->eutran.tai.mcc = raid_temp.mcc;
+ ri->eutran.tai.mnc = raid_temp.mnc;
+ ri->eutran.tai.mnc_3_digits = raid_temp.mnc_3_digits;
+ ri->eutran.tai.tac = osmo_load16be(buf + 3);
+ memcpy(ri->eutran.global_enb_id, buf + 5, len - 6);
+ ri->eutran.global_enb_id_len = len - 6;
+ return len;
+ default:
+ return -EINVAL;
+ }
+}
+
+/*! Encode a RIM Routing information IE (3GPP TS 48.018, chapter 11.3.70).
+ * \param[out] buf user provided memory (at least 14 byte) for the generated value part of the IE.
+ * \param[in] ri user provided input data struct.
+ * \returns length of encoded octets, -EINVAL on error. */
+int bssgp_create_rim_ri(uint8_t *buf, const struct bssgp_rim_routing_info *ri)
+{
+ int rc;
+ struct gprs_ra_id raid_temp;
+
+ buf[0] = ri->discr & 0x0f;
+ buf++;
+
+ switch (ri->discr) {
+ case BSSGP_RIM_ROUTING_INFO_GERAN:
+ rc = bssgp_create_cell_id(buf, &ri->geran.raid, ri->geran.cid);
+ if (rc < 0)
+ return -EINVAL;
+ return rc + 1;
+ case BSSGP_RIM_ROUTING_INFO_UTRAN:
+ gsm48_encode_ra((struct gsm48_ra_id *)buf, &ri->utran.raid);
+ osmo_store16be(ri->utran.rncid, buf + 6);
+ return 9;
+ case BSSGP_RIM_ROUTING_INFO_EUTRAN:
+ /* Note: 3GPP TS 24.301 Figure 9.9.3.32.1 and 3GPP TS 24.008
+ * Figure 10.5.130 specify MCC/MNC encoding in the same way,
+ * so we can re-use gsm48_encode_ra() for that. */
+ raid_temp = (struct gprs_ra_id) {
+ .mcc = ri->eutran.tai.mcc,
+ .mnc = ri->eutran.tai.mnc,
+ .mnc_3_digits = ri->eutran.tai.mnc_3_digits,
+ };
+
+ gsm48_encode_ra((struct gsm48_ra_id *)buf, &raid_temp);
+ osmo_store16be(ri->eutran.tai.tac, buf + 3);
+ OSMO_ASSERT(ri->eutran.global_enb_id_len <=
+ sizeof(ri->eutran.global_enb_id));
+ memcpy(buf + 5, ri->eutran.global_enb_id,
+ ri->eutran.global_enb_id_len);
+ return ri->eutran.global_enb_id_len + 6;
+ default:
+ return -EINVAL;
+ }
+}
+
/*! Decode a RAN Information Request Application Container for NACC (3GPP TS 48.018, section 11.3.63.1.1).
* \param[out] user provided memory for decoded data struct.
* \param[in] buf user provided memory with the encoded value data of the IE.