diff options
Diffstat (limited to 'openbsc/src/gprs/gprs_utils.c')
| -rw-r--r-- | openbsc/src/gprs/gprs_utils.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/openbsc/src/gprs/gprs_utils.c b/openbsc/src/gprs/gprs_utils.c index 1a8fa4316..55d4efda1 100644 --- a/openbsc/src/gprs/gprs_utils.c +++ b/openbsc/src/gprs/gprs_utils.c @@ -24,6 +24,8 @@ #include <osmocom/core/msgb.h> #include <osmocom/gprs/gprs_ns.h> +#include <osmocom/gsm/protocol/gsm_04_08.h> + #include <string.h> /* FIXME: this needs to go to libosmocore/msgb.c */ @@ -162,3 +164,40 @@ int gprs_str_to_apn(uint8_t *apn_enc, size_t max_len, const char *str) return len; } +/* GSM 04.08, 10.5.1.4 */ +int gprs_is_mi_tmsi(const uint8_t *value, size_t value_len) +{ + if (value_len != GSM48_TMSI_LEN) + return 0; + + if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_TMSI) + return 0; + + return 1; +} + +/* GSM 04.08, 10.5.1.4 */ +int gprs_is_mi_imsi(const uint8_t *value, size_t value_len) +{ + if (value_len == 0) + return 0; + + if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) + return 0; + + return 1; +} + +int gprs_parse_mi_tmsi(const uint8_t *value, size_t value_len, uint32_t *tmsi) +{ + uint32_t tmsi_be; + + if (!gprs_is_mi_tmsi(value, value_len)) + return 0; + + memcpy(&tmsi_be, value + 1, sizeof(tmsi_be)); + + *tmsi = ntohl(tmsi_be); + return 1; +} + |