libmsc: ran_iu_make_security_mode_command(): clarify UIA mask

Change-Id: I7535d5ede5b22c61575a16d15927598e6137392a
changes/10/26410/3
Vadim Yanitskiy 1 year ago
parent 35db146e88
commit d405bad32d
  1. 6
      src/libmsc/ran_msg_iu.c

@ -375,6 +375,8 @@ static struct msgb *ran_iu_make_rab_assignment(struct osmo_fsm_inst *caller_fi,
static struct msgb *ran_iu_make_security_mode_command(struct osmo_fsm_inst *caller_fi,
const struct ran_cipher_mode_command *cm)
{
/* TODO: make the choice of available UIA algorithms configurable */
const uint8_t uia_mask = (1 << OSMO_UTRAN_UIA1) | (1 << OSMO_UTRAN_UIA2);
bool use_encryption = cm->utran.uea_encryption_mask > (1 << OSMO_UTRAN_UEA0);
LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "Tx RANAP SECURITY MODE COMMAND to RNC, IK=%s, CK=%s\n",
@ -384,7 +386,9 @@ static struct msgb *ran_iu_make_security_mode_command(struct osmo_fsm_inst *call
* in the case of A5? */
return ranap_new_msg_sec_mod_cmd2(cm->vec->ik,
use_encryption ? cm->vec->ck : NULL,
RANAP_KeyStatus_new, 0x06, cm->utran.uea_encryption_mask);
RANAP_KeyStatus_new,
(uia_mask << 1), /* API treats LSB as UIA0 */
cm->utran.uea_encryption_mask);
}

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