libmsc: ran_iu_make_security_mode_command(): clarify UIA mask
Change-Id: I7535d5ede5b22c61575a16d15927598e6137392a
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@ -375,6 +375,8 @@ static struct msgb *ran_iu_make_rab_assignment(struct osmo_fsm_inst *caller_fi,
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static struct msgb *ran_iu_make_security_mode_command(struct osmo_fsm_inst *caller_fi,
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const struct ran_cipher_mode_command *cm)
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{
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/* TODO: make the choice of available UIA algorithms configurable */
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const uint8_t uia_mask = (1 << OSMO_UTRAN_UIA1) | (1 << OSMO_UTRAN_UIA2);
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bool use_encryption = cm->utran.uea_encryption_mask > (1 << OSMO_UTRAN_UEA0);
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LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "Tx RANAP SECURITY MODE COMMAND to RNC, IK=%s, CK=%s\n",
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@ -384,7 +386,9 @@ static struct msgb *ran_iu_make_security_mode_command(struct osmo_fsm_inst *call
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* in the case of A5? */
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return ranap_new_msg_sec_mod_cmd2(cm->vec->ik,
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use_encryption ? cm->vec->ck : NULL,
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RANAP_KeyStatus_new, 0x06, cm->utran.uea_encryption_mask);
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RANAP_KeyStatus_new,
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(uia_mask << 1), /* API treats LSB as UIA0 */
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cm->utran.uea_encryption_mask);
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}
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