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It's a pity that even with this patch we still are fare away from having
the whole API documented. However, at least we have a more solid
foundation. Updates not only extend the documentation, but also make
sure it is rendered properly in the doxygen HTML.
Change-Id: I1344bd1a6869fb00de7c1899a8db93bba9bafce3
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To ensure that the IND index appended to SEQ does not affect the SEQ, the check
should read '>= seq_1', not '>'.
Change-Id: Ib1251159eee02aa07fae1b429ffec2e4604bf6a8
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So far we incremented SQN by 1, which doesn't match the procedures described in
3GPP TS 33.102. An IND (index) denotes a non-significant part of SQN, and the
significant SEQ part needs to be incremented.
In OsmoHLR we furthermore want to use the "exception" suggested in annex C.3.4,
so that each HLR's client has a fixed IND index. In other words, we will not
assign IND cyclically, but keep IND unchanged per auth vector consumer.
Add 'ind_bitlen' and 'ind' to the osmo_sub_auth_data.u.umts structure and
increment SQN accordingly.
Add a comment explaining the details.
Because 'ind_bitlen' is still passed as zero, the milenage_test does not change
its behavior, which is a feature I want to clearly show in this patch. The test
will be expanded for the newly implemented SQN scheme in a subsequent patch.
Adjust osmo-auc-gen.c to still show the right SQN and SQN.MS -- because it is
passing ind_bitlen == 0, osmo-auc-gen can rely on single increments and know
SQN.MS is sqn - 1. Note that osmo-auc-gen_test output remains unchanged.
Related: OS#1968
Change-Id: Ibc97e1736a797ffcbf8c1f7d41c5c4518f4e41bf
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Prepare for the implementation of splitting SQN increments in SEQ and an IND
part; particularly to clearly show where the changes in auth/milenage_test's
expectations originate.
Rationale: the source of UMTS auth vectors, for us usually OsmoHLR, typically
stores the last used SQN, not the next one to be used. Particularly with the
upcoming fix of the SQN scheme, this change is important: the next SQN will
depend on which entity asks for it, because each auth consumer may have a
particular slot in the IND part of SQN. It does not make sense to store the
next SQN, because we will not know which consumer that will be for.
The milenage_test has always calculated a tuple for SQN == 34. To account for
the increment now happening before calculating a tuple, lower the test_aud->sqn
by one to 0x21 == 33, so that it is still calculating for SQN == 34.
Because we are no longer incrementing SQN after the tuple is generated,
milenage_test's expected output after doing an AUTS resync to 31 changes to the
next SQN = 32, the SQN used for the generated tuple.
(BTW, a subsequent patch will illustrate AUTS in detail.)
osmo-auc-gen now needs to pass the user requested SQN less one, because the SQN
will be incremented befor generating the auth vector. Also the SQN remains the
same after generating, so SQN output needs less decrementing. Note that the
expected output for osmo-auc-gen_test remains unchanged, hence the same input
arguments (particularly -s <sqn> and -A <auts>) still produce the same results.
Note: osmo-hlr regression tests will require adjustments when this patch is
merged, because it must now pass desired_sqn - 1 instead of just desired_sqn.
See osmo-hlr change-id I4ec5a578537acb1d9e1ebfe00a72417fc3ca5894 .
Related: OS#1968
Change-Id: Iadf43f21e0605e9e85f7e8026c40985f7ceff1a3
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Use generic functions covered by testsuit for SQN calculations.
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... and add integration into the osmo_auth core.
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