diff options
Diffstat (limited to 'src/gsm/gsm48.c')
| -rw-r--r-- | src/gsm/gsm48.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c index 8a46f769..b4740cf0 100644 --- a/src/gsm/gsm48.c +++ b/src/gsm/gsm48.c @@ -35,6 +35,7 @@ #include <osmocom/gsm/gsm_utils.h> #include <osmocom/gsm/protocol/gsm_04_08.h> #include <osmocom/gsm/protocol/gsm_08_58.h> +#include <osmocom/gsm/protocol/gsm_04_08_gprs.h> const struct tlv_definition gsm48_att_tlvdef = { .def = { @@ -302,6 +303,30 @@ static void to_bcd(uint8_t *bcd, uint16_t val) val = val / 10; } +/*! \brief 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 + * \return true if message can be encrypted, false otherwise + */ +bool gsm48_hdr_gmm_cipherable(const struct gsm48_hdr *hdr) +{ + switch(hdr->msg_type) { + case GSM48_MT_GMM_ATTACH_REQ: + case GSM48_MT_GMM_ATTACH_REJ: + case GSM48_MT_GMM_AUTH_CIPH_REQ: + case GSM48_MT_GMM_AUTH_CIPH_RESP: + case GSM48_MT_GMM_AUTH_CIPH_REJ: + case GSM48_MT_GMM_AUTH_CIPH_FAIL: + case GSM48_MT_GMM_ID_REQ: + case GSM48_MT_GMM_ID_RESP: + case GSM48_MT_GMM_RA_UPD_REQ: + case GSM48_MT_GMM_RA_UPD_REJ: + return false; + default: + return true; + } +} + /* Convert given mcc and mnc to BCD and write to *bcd_dst, which must be an * allocated buffer of (at least) 3 bytes length. */ void gsm48_mcc_mnc_to_bcd(uint8_t *bcd_dst, uint16_t mcc, uint16_t mnc) |