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debb0e3868
Upon authentication response, initiate integrity protection for Iu by sending a Security Mode Command (IK), with hardcoded auth tuple so far. Implement RANAP event handling to receive Security Mode Complete message, adding stubs for the other events; in new files osmo-cscn/iucs_ranap.[hc] to keep RANAP dependencies separate, and particularly out of libmsc. Upon receiving Security Mode Complete, call the security operation callback (conn->sec_operation->cb) to complete the Location Update. Introduce enum integrity_protection_state constants to indicate integrity protection, record in gsm_subscriber_conn.iu.integrity_protection. Make subscr_conn_lookup_iu() non-static and declare in iu_cs.h to be able to call from iucs_ranap.c's Security Mode Complete event. Implement dummy iu_tx_sec_mode_cmd() to allow tests to build without RANAP dependencies. In cscn_main.c, call iucs_rx_ranap_event(), to populate the struct gsm_network struct with cscn_network explicitly (don't share cscn_network across compilation scopes because it's ugly).