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-rw-r--r--src/gsm/gsm48.c126
1 files changed, 72 insertions, 54 deletions
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index b58e9e2c..c2affaeb 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -30,6 +30,7 @@
#include <string.h>
#include <stdbool.h>
#include <inttypes.h>
+#include <ctype.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/byteswap.h>
@@ -180,6 +181,19 @@ const char *rr_cause_name(uint8_t cause)
return get_value_string(rr_cause_names, cause);
}
+/*! Return MCC-MNC-LAC-RAC as string, in a static buffer.
+ * \param[in] rai RAI to encode.
+ * \returns Static string buffer.
+ */
+const char *osmo_rai_name(const struct gprs_ra_id *rai)
+{
+ static char buf[32];
+ snprintf(buf, sizeof(buf), "%s-%s-%u-%u",
+ osmo_mcc_name(rai->mcc), osmo_mnc_name(rai->mnc, rai->mnc_3_digits), rai->lac,
+ rai->rac);
+ return buf;
+}
+
/* FIXME: convert to value_string */
static const char *cc_state_names[32] = {
"NULL",
@@ -418,15 +432,6 @@ const char *gsm48_mi_type_name(uint8_t mi)
return get_value_string(mi_type_names, mi);
}
-static void to_bcd(uint8_t *bcd, uint16_t val)
-{
- bcd[2] = val % 10;
- val = val / 10;
- bcd[1] = val % 10;
- val = val / 10;
- bcd[0] = val % 10;
-}
-
/*! Checks is particular message is cipherable in A/Gb mode according to
* 3GPP TS 24.008 ยง 4.7.1.2
* \param[in] hdr Message header
@@ -451,64 +456,61 @@ bool gsm48_hdr_gmm_cipherable(const struct gsm48_hdr *hdr)
}
}
-/* Convert MCC + MNC to BCD representation
- * \param[out] bcd_dst caller-allocated memory for output
- * \param[in] mcc Mobile Country Code
- * \param[in] mnc Mobile Network Code
- *
- * Convert given mcc and mnc to BCD and write to *bcd_dst, which must be an
- * allocated buffer of (at least) 3 bytes length. */
+/* Convert MCC + MNC to BCD representation, legacy implementation.
+ * Instead use osmo_plmn_to_bcd(), which is also capable of converting
+ * 3-digit MNC that have leading zeros. For parameters, also see there. */
void gsm48_mcc_mnc_to_bcd(uint8_t *bcd_dst, uint16_t mcc, uint16_t mnc)
{
- uint8_t bcd[3];
-
- to_bcd(bcd, mcc);
- bcd_dst[0] = bcd[0] | (bcd[1] << 4);
- bcd_dst[1] = bcd[2];
-
- to_bcd(bcd, mnc);
- /* FIXME: do we need three-digit MNC? See Table 10.5.3 */
- if (mnc > 99) {
- bcd_dst[1] |= bcd[2] << 4;
- bcd_dst[2] = bcd[0] | (bcd[1] << 4);
- } else {
- bcd_dst[1] |= 0xf << 4;
- bcd_dst[2] = bcd[1] | (bcd[2] << 4);
- }
+ const struct osmo_plmn_id plmn = {
+ .mcc = mcc,
+ .mnc = mnc,
+ .mnc_3_digits = false,
+ };
+ osmo_plmn_to_bcd(bcd_dst, &plmn);
}
-/* Convert given 3-byte BCD buffer to integers and write results to *mcc and
- * *mnc. The first three BCD digits result in the MCC and the remaining ones in
- * the MNC. */
+/* Convert given 3-byte BCD buffer to integers, legacy implementation.
+ * Instead use osmo_plmn_from_bcd(), which is also capable of converting
+ * 3-digit MNC that have leading zeros. For parameters, also see there. */
void gsm48_mcc_mnc_from_bcd(uint8_t *bcd_src, uint16_t *mcc, uint16_t *mnc)
{
- *mcc = (bcd_src[0] & 0x0f) * 100
- + (bcd_src[0] >> 4) * 10
- + (bcd_src[1] & 0x0f);
-
- if ((bcd_src[1] & 0xf0) == 0xf0) {
- *mnc = (bcd_src[2] & 0x0f) * 10
- + (bcd_src[2] >> 4);
- } else {
- *mnc = (bcd_src[2] & 0x0f) * 100
- + (bcd_src[2] >> 4) * 10
- + (bcd_src[1] >> 4);
- }
+ struct osmo_plmn_id plmn;
+ osmo_plmn_from_bcd(bcd_src, &plmn);
+ *mcc = plmn.mcc;
+ *mnc = plmn.mnc;
}
-/*! Encode TS 04.08 Location Area Identifier
- * \param[out] caller-provided memory for output
+/*! Encode TS 04.08 Location Area Identifier, legacy implementation.
+ * Instead use gsm48_generate_lai2(), which is capable of three-digit MNC with leading zeros.
+ * \param[out] lai48 caller-provided memory for output
* \param[in] mcc Mobile Country Code
* \param[in] mnc Mobile Network Code
* \param[in] lac Location Area Code */
void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc,
uint16_t mnc, uint16_t lac)
{
- gsm48_mcc_mnc_to_bcd(&lai48->digits[0], mcc, mnc);
- lai48->lac = osmo_htons(lac);
+ const struct osmo_location_area_id lai = {
+ .plmn = {
+ .mcc = mcc,
+ .mnc = mnc,
+ .mnc_3_digits = false,
+ },
+ .lac = lac,
+ };
+ gsm48_generate_lai2(lai48, &lai);
+}
+
+/*! Encode TS 04.08 Location Area Identifier.
+ * \param[out] lai48 caller-provided memory for output.
+ * \param[in] lai input of MCC-MNC-LAC. */
+void gsm48_generate_lai2(struct gsm48_loc_area_id *lai48, const struct osmo_location_area_id *lai)
+{
+ osmo_plmn_to_bcd(&lai48->digits[0], &lai->plmn);
+ lai48->lac = osmo_htons(lai->lac);
}
-/*! Decode TS 04.08 Location Area Identifier
+/*! Decode TS 04.08 Location Area Identifier, legacy implementation.
+ * Instead use gsm48_decode_lai2(), which is capable of three-digit MNC with leading zeros.
* \param[in] Location Area Identifier (encoded)
* \param[out] mcc Mobile Country Code
* \param[out] mnc Mobile Network Code
@@ -519,11 +521,25 @@ void gsm48_generate_lai(struct gsm48_loc_area_id *lai48, uint16_t mcc,
int gsm48_decode_lai(struct gsm48_loc_area_id *lai, uint16_t *mcc,
uint16_t *mnc, uint16_t *lac)
{
- gsm48_mcc_mnc_from_bcd(&lai->digits[0], mcc, mnc);
- *lac = osmo_ntohs(lai->lac);
+ struct osmo_location_area_id decoded;
+ gsm48_decode_lai2(lai, &decoded);
+ *mcc = decoded.plmn.mcc;
+ *mnc = decoded.plmn.mnc;
+ *lac = decoded.lac;
return 0;
}
+/*! Decode TS 04.08 Location Area Identifier.
+ * \param[in] Location Area Identifier (encoded).
+ * \param[out] decoded Target buffer to write decoded values of MCC-MNC-LAC.
+ *
+ * Attention: this function returns true integers, not hex! */
+void gsm48_decode_lai2(const struct gsm48_loc_area_id *lai, struct osmo_location_area_id *decoded)
+{
+ osmo_plmn_from_bcd(&lai->digits[0], &decoded->plmn);
+ decoded->lac = osmo_ntohs(lai->lac);
+}
+
/*! Set DTX mode in Cell Options IE (3GPP TS 44.018)
* \param[in] op Cell Options structure in which DTX parameters will be set
* \param[in] full Mode for full-rate channels
@@ -682,10 +698,12 @@ void gsm48_parse_ra(struct gprs_ra_id *raid, const uint8_t *buf)
if ((buf[1] >> 4) == 0xf) {
raid->mnc = (buf[2] & 0xf) * 10;
raid->mnc += (buf[2] >> 4) * 1;
+ raid->mnc_3_digits = false;
} else {
raid->mnc = (buf[2] & 0xf) * 100;
raid->mnc += (buf[2] >> 4) * 10;
raid->mnc += (buf[1] >> 4) * 1;
+ raid->mnc_3_digits = true;
}
raid->lac = osmo_load16be(buf + 3);
@@ -704,7 +722,7 @@ void gsm48_encode_ra(struct gsm48_ra_id *out, const struct gprs_ra_id *raid)
out->digits[0] = ((raid->mcc / 100) % 10) | (((raid->mcc / 10) % 10) << 4);
out->digits[1] = raid->mcc % 10;
- if (raid->mnc < 100) {
+ if (raid->mnc < 100 && !raid->mnc_3_digits) {
out->digits[1] |= 0xf0;
out->digits[2] = ((raid->mnc / 10) % 10) | ((raid->mnc % 10) << 4);
} else {
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-03 08:52:43 +0000