With the introduction of X2AP into develop, the UEs now have to regularly
send measurement reports.

In the logs of the eNB, we see:

[OSA]   Mismatch found in integrity for algorithm 2,
        got e0.a0.c2.66, expecting a5.9c.cb.57
[PDCP]   [OSA][RB 1] eNB failed to validate MAC-I of incoming PDU

This is a bug in the PDCP layer that uses wrong parameters to compute the
integrity.

This commit fixes this bug.

The function pdcp_is_rx_seq_number_valid was removed. Its processing
has been directly integrated into the function pdcp_data_ind.

The function pdcp_mark_current_pdu_as_received is not called anymore.
Its processing was not used later on, so as of today, not calling it does
not introduce any functional change.

The function pdcp_validate_security takes now as parameters both
SN and HFN. Same for the function pdcp_get_next_count_rx.

Useless constants PDCP_SN_5BIT, PDCP_SN_7BIT and PDCP_SN_12BIT have been
removed.

The compilation option ENABLE_SECURITY has been removed. It's now always
on. (This may impact some use cases.)

The PDCP for DRB using RLC AM is not correct. It was not correct before
this commit (apart from the integrity bug). We should deal with a list
of PDUs and transmit packets to upper layers as detailed in the specs.
Today we transmit the PDU as soon as we get it. We don't care about
duplicates, in-order delivery, timeouts.

Also, we don't deal with "PDCP re-establishment". Not sure how that impacts
the software.

And, last but not least, there is still no ROHC.

For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

S1AP PATH SWITCH REQUEST/REQUEST ACK/FAILURE
RRC MEASUREMENT REPORT
MINOR CHANGES IN MAC LAYER

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

adds a mac_MainConfig information element to RRCConnectionSetup. This is to configure PHR reporting during the first part of the Attach procedure.

rework of configuration for eMTC/Sidelink. Removal of warnings introduced by eMTC code. Validation of configuration component for eMTC and regular LTE. Sidelink is still not configured.

abort execution when an unknown option is passed via the command line: add config_check_cmdlineopt API to config module, create lte-softmodem-common.c source to remove duplicate code in lte-softmodem.c and lte-uesoftmodem.c, fix segfaults in exec_function of lte-uesoftmodem

1. Modify all expressions using original LTE-RRC data types for new generated ones
2. Does not change any program logic

Fix the assertion:
Assertion ((instance_p->mnc_digit_length[ue_desc_p->selected_plmn_identity] == 3) || (instance_p->mnc_digit_length[ue_desc_p->selected_plmn_identity] == 2)) failed!
In s1ap_eNB_handle_nas_first_req() /home/ubuntu/tmp/openair3/S1AP/s1ap_eNB_nas_procedures.c:243

With this hotfix the UE selects the first PLMN sent by the eNodeB.

The UE has to select the correct PLMN from those received in SIB1. This
will be done with a later merge request.

Use common log mechanism in layer 3, mapping specific macros to common ones and extending common log utilities to support specific layer3 requirements

remove compilation warnings, especially when disabling T_TRACER. enhance LOG_M macro implementation, introduce LOG_DEBUG_XXX macro to replace #ifdef DEBUG_XXX

log.c simplification, fix usefull functionality which never worked, move all log code from openair2 to common

1. It's no need to modify LTE-RRC's ASN.1 file for enabling option group
   feature in generate_asn1.
2. It's no need to patch the C header files generated from
   LTE-RRC/S1AP/X2AP's ASN.1 in fix_asn1.
3. It's no need to pre-process S1AP/X2AP's ASN.1 for enabling information
   object class feature by asn1tostruct.py.

This commit requires an un-official version of asn1c which are
collaboration of asn1c community members and `build_helper` is modified
in this commit accordingly :

  https://github.com/brchiu/asn1c/tree/velichkov_s1ap_plus_option_group

This asn1c can also convert ASN.1 of 5G NR RRC (38.331, v15.1.0) and
generate C files with -findirect-choice command line option without
tweaking ASN.1 file.

Examples for how to use this asn1c for S1AP are in S1AP files, e.g.
s1ap_eNB_nas_procedures.c and s1ap_eNB_handler.c.

There is an modified openair-cn (based on tag 0.5.0) with this new asn1c at :

  https://github.com/brchiu/openair-cn/tree/new-asn1c

Basic S1AP interaction and data transfer operation between OAI eNB and
this modified openair-cn has been tested.

Note: Community version of asn1c is keeping evolved to provide better usage.

To minimize migration effort, we follow the logic of legacy macro Rel10 and Rel14 used
for conditional compilation of current code.

In the future, they might be changed to accommodate finer software configuration, e.g.
MAKE_VERSION(12,2,0) or MAKE_VERSION(13,1,0) .... etc.

The new 'basic simulator' is now functional.
A proper solution is needed to deal with SIB18/19/21
for the D2D functionality.

UE directory splits, creation of UE-specific files, common UE/eNB files and extraction of UE/common components from eNodeB files. renaming of files to minimize common names across directories (i.e. defs.h, vars.h, extern.h)

The unused bits are the lower bits, so we need to shift.

Not sure that the value 1 is what we want though.

merge the implemention of Paging, RRCConnectionRelease, RRCConnectionReestablishment, E-RAB Modify, E-RAB Release