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-rw-r--r--include/osmocom/gsm/protocol/gsm_04_08_gprs.h5
-rw-r--r--src/gsm/gsm_04_08_gprs.c31
-rw-r--r--src/gsm/libosmogsm.map1
3 files changed, 36 insertions, 1 deletions
diff --git a/include/osmocom/gsm/protocol/gsm_04_08_gprs.h b/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
index e0e887fa..ed9a596a 100644
--- a/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
+++ b/include/osmocom/gsm/protocol/gsm_04_08_gprs.h
@@ -2,7 +2,9 @@
#define _GSM48_GPRS_H
#include <stdint.h>
+#include <stdbool.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/crypt/gprs_cipher.h>
/* Table 10.4 / 10.4a, GPRS Mobility Management (GMM) */
#define GSM48_MT_GMM_ATTACH_REQ 0x01
@@ -362,6 +364,9 @@ enum gsm48_qos_sdu_err {
GSM48_QOS_SERR_1e_1 = 0x07,
};
+bool gprs_ms_net_cap_gea_supported(const uint8_t *ms_net_cap, uint8_t cap_len,
+ enum gprs_ciph_algo gea);
+
/* Figure 10.5.138/24.008 / Chapter 10.5.6.5 */
struct gsm48_qos {
/* octet 3 */
diff --git a/src/gsm/gsm_04_08_gprs.c b/src/gsm/gsm_04_08_gprs.c
index 5c00ea00..7018777b 100644
--- a/src/gsm/gsm_04_08_gprs.c
+++ b/src/gsm/gsm_04_08_gprs.c
@@ -21,9 +21,11 @@
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
-
+#include <osmocom/crypt/gprs_cipher.h>
#include <osmocom/core/utils.h>
+#include <stdbool.h>
+
/* Protocol related stuff, should go into libosmocore */
/* 10.5.5.14 GPRS MM Cause / Table 10.5.147 */
@@ -108,6 +110,33 @@ const struct value_string gsm48_gsm_cause_names_[] = {
const struct value_string *gsm48_gsm_cause_names = gsm48_gsm_cause_names_;
+/*! \brief Check if MS supports particular version of GEA by inspecting
+ * MS network capability IE specified in 3GPP TS 24.008
+ * \param[in] ms_net_cap Buffer with raw MS network capability IE value,
+ * 3 - 10 bytes
+ * \param[in] cap_len Length of ms_net_cap, in bytes
+ * \param[in] gea Version of GEA to check
+ * \returns true if given version is supported by MS, false otherwise
+ */
+bool gprs_ms_net_cap_gea_supported(const uint8_t *ms_net_cap, uint8_t cap_len,
+ enum gprs_ciph_algo gea)
+{
+ switch (gea) {
+ case GPRS_ALGO_GEA0:
+ return true;
+ case GPRS_ALGO_GEA1: /* 1st bit is GEA1: */
+ return 0x80 & ms_net_cap[0];
+ case GPRS_ALGO_GEA2: /* extended GEA bits start from 2nd bit */
+ return 0x40 & ms_net_cap[1]; /* of the next byte */
+ case GPRS_ALGO_GEA3:
+ return 0x20 & ms_net_cap[1];
+ case GPRS_ALGO_GEA4:
+ return 0x10 & ms_net_cap[1];
+ default:
+ return false;
+ }
+}
+
/* 10.5.5.2 */
const struct value_string gprs_att_t_strs_[] = {
{ GPRS_ATT_T_ATTACH, "GPRS attach" },
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index ebeabcdc..96f615e3 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -44,6 +44,7 @@ gprs_cipher_supported;
gprs_cipher_key_length;
gprs_tlli_type;
gprs_tmsi2tlli;
+gprs_ms_net_cap_gea_supported;
gsm48_gmm_cause_names;
gsm48_gsm_cause_names;