gbproxy: Move away from random TLLI
We used to generate a random TLLI for each ConnHldr. Instead, use a deterministic function to generate the P-TMSI (just like we do for the IMSI) and derive a local TLLI from that P-TMSI. Related: OS#4472, SYS#5002 Change-Id: Ic1eaa1d298fe998ca97432769953bfc5a5333ae4
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@ -597,14 +597,15 @@ function f_start_handler(void_fn fn, charstring id, GbInstances pcu, GbInstances
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float t_guard := 30.0)
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runs on test_CT return BSSGP_ConnHdlr {
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var BSSGP_ConnHdlr vc_conn;
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var OCT4 p_tmsi := f_gen_tmsi(imsi_suffix);
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var BSSGP_ConnHdlrPars pars := {
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imei := f_gen_imei(imsi_suffix),
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imsi := f_gen_imsi(imsi_suffix),
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msisdn := f_gen_msisdn(imsi_suffix),
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p_tmsi := omit,
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p_tmsi := p_tmsi,
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p_tmsi_sig := omit,
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tlli := f_gprs_tlli_random(),
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tlli := f_gprs_tlli_from_tmsi(p_tmsi, TLLI_LOCAL),
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tlli_old := omit,
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ra := omit,
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pcu := g_pcu,
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@ -3252,6 +3252,25 @@ octetstring sdu) := {
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}
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}
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/* build a TLLI of specified type from the given (P)TMSI */
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function f_gprs_tlli_from_tmsi(OCT4 tmsi, TlliType tlli_type) return OCT4 {
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var bitstring tmsi_bits := oct2bit(tmsi);
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var bitstring prefix;
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select (tlli_type) {
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case (TLLI_LOCAL) { prefix := '11'B }
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case (TLLI_FOREIGN) { prefix := '01111'B }
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case (TLLI_RANDOM) { prefix := '0110'B }
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case (TLLI_RESERVED) { prefix := '010'B }
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case (TLLI_G_RNTI) { prefix := '0000'B }
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case (TLLI_RAND_G_RNTI) { prefix := '0001'B }
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case else {
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setverdict(fail, "Unknonw TLLI Type ", tlli_type);
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mtc.stop;
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}
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}
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return bit2oct(prefix & substr(tmsi_bits, lengthof(prefix), 32-lengthof(prefix)));
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}
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function f_gprs_tlli_random() return OCT4 {
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var OCT4 tlli := f_rnd_octstring(4);
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return tlli or4b 'c0000000'O;
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