diff options
| author | Max <msuraev@sysmocom.de> | 2016-07-05 16:06:28 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2016-07-07 12:55:46 +0000 |
| commit | fdca25dfb881871ffb4142bd1bcd808c71e6c4e3 (patch) | |
| tree | 33d0ef8f6f217d71e815c2cea51f842c31d0333b /src/gsm | |
| parent | ae3b78076e580b6060cde2e4612b8bcf459de832 (diff) | |
Add function to check GMM encryptability
Check if particular GMM message can be encrypted according to 3GPP TS
24.008 § 4.7.1.2
Related: OS#1582
Change-Id: I7ad0e03c2c738d174dd6bc3453f332eeb8da1e7d
Diffstat (limited to 'src/gsm')
| -rw-r--r-- | src/gsm/gsm48.c | 25 | ||||
| -rw-r--r-- | src/gsm/libosmogsm.map | 1 |
2 files changed, 26 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 § 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) diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index 19ebb5b3..c68cf2a5 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -124,6 +124,7 @@ gsm48_att_tlvdef; gsm48_cc_msg_name; gsm48_cc_state_name; gsm48_construct_ra; +gsm48_hdr_gmm_cipherable; gsm48_decode_bcd_number; gsm48_decode_bearer_cap; gsm48_decode_called; |