tests/rlcmac: fix malformed MS RA capability in testRAcap()

Long story short: as it turns out the test vector '12a5146200'O
has been generated by TITAN, and it's malformed. The length
indicator it contains must be at least 29 bits, not 21. This
field is calculated by TITAN automatically, so I guess there
is a bug somewhere in its RAW encoder implementation.

It's funny that Wireshark decodes the old malformed vector without
any problems if it's encapsulated into the BSSGP DL-UNITDATA. The
reason for that is because BSSGP dissector does not actually use
the CSN.1 codec and relies on its own hand-written parser [1],
which does not respect the length constraints.

Furthermore, table 10.5.146/3GPP TS 24.008, describing the format
of MS Radio Access Capability IE, has the following comment:

  < Multislot capability struct > ::=
    { 0 | 1 < HSCSD multislot class : bit (5) > }
    ...
  -- error: struct too short, assume features do not exist

so ideally our CSN.1 decoder should be more tolerant to the old
malformed vector, but unfortunately error handling is not implemented.

[1] See de_gmm_ms_radio_acc_cap() in epan/dissectors/packet-gsm_a_gm.c.

Change-Id: I5f810397b8d09c18e069168023429f6a4d899c86

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/rlcmac/RLCMACTest.err b/tests/rlcmac/RLCMACTest.err
index 2d7de591..52a3cc3a 100644
--- a/tests/rlcmac/RLCMACTest.err
+++ b/tests/rlcmac/RLCMACTest.err
@@ -29,4 +29,5 @@ DCSN1 INFO csnStreamEncoder (type=8): PayloadType = 1 | spare = 0 | R = 0 | MESS
 DCSN1 INFO csnStreamDecoder (type=2): PayloadType = 1 | spare = 0 | R = 0 | MESSAGE_TYPE = 2 | DOWNLINK_TFI = 20 |  : Ack_Nack_Description | FINAL_ACK_INDICATION = 1 | STARTING_SEQUENCE_NUMBER = 1 | RECEIVED_BLOCK_BITMAP[0] = 0 | RECEIVED_BLOCK_BITMAP[1] = 0 | RECEIVED_BLOCK_BITMAP[2] = 0 | RECEIVED_BLOCK_BITMAP[3] = 0 | RECEIVED_BLOCK_BITMAP[4] = 0 | RECEIVED_BLOCK_BITMAP[5] = 0 | RECEIVED_BLOCK_BITMAP[6] = 0 | RECEIVED_BLOCK_BITMAP[7] = 1 | : End Ack_Nack_Description | Exist_Channel_Request_Description = 1 |  : Channel_Request_Description | PEAK_THROUGHPUT_CLASS = 0 | RADIO_PRIORITY = 0 | RLC_MODE = 0 | LLC_PDU_TYPE = 1 | RLC_OCTET_COUNT = 18 | : End Channel_Request_Description |  : Channel_Quality_Report | C_VALUE = 40 | RXQUAL = 1 | SIGN_VAR = 0 | Slot[0].Exist = 0 | Slot[1].Exist = 0 | Slot[2].Exist = 0 | Slot[3].Exist = 0 | Slot[4].Exist = 0 | Slot[5].Exist = 0 | Slot[6].Exist = 0 | Slot[7].Exist = 0 | : End Channel_Quality_Report | Exist_AdditionsR99 = 1 |  : AdditionsR99 | Exist_PFI = 0 | : End AdditionsR99 | Padding = 3|43|43|43|43|43|
 DCSN1 INFO csnStreamEncoder (type=2): PayloadType = 1 | spare = 0 | R = 0 | MESSAGE_TYPE = 2 | DOWNLINK_TFI = 20 |  : Ack_Nack_Description | FINAL_ACK_INDICATION = 1 | STARTING_SEQUENCE_NUMBER = 1 | RECEIVED_BLOCK_BITMAP[0] = 0 | RECEIVED_BLOCK_BITMAP[1] = 0 | RECEIVED_BLOCK_BITMAP[2] = 0 | RECEIVED_BLOCK_BITMAP[3] = 0 | RECEIVED_BLOCK_BITMAP[4] = 0 | RECEIVED_BLOCK_BITMAP[5] = 0 | RECEIVED_BLOCK_BITMAP[6] = 0 | RECEIVED_BLOCK_BITMAP[7] = 1 |  : End Ack_Nack_Description | Exist_Channel_Request_Description = 1 |  : Channel_Request_Description | PEAK_THROUGHPUT_CLASS = 0 | RADIO_PRIORITY = 0 | RLC_MODE = 0 | LLC_PDU_TYPE = 1 | RLC_OCTET_COUNT = 18 |  : End Channel_Request_Description |  : Channel_Quality_Report | C_VALUE = 40 | RXQUAL = 1 | SIGN_VAR = 0 | Slot[0].Exist = 0 | Slot[1].Exist = 0 | Slot[2].Exist = 0 | Slot[3].Exist = 0 | Slot[4].Exist = 0 | Slot[5].Exist = 0 | Slot[6].Exist = 0 | Slot[7].Exist = 0 |  : End Channel_Quality_Report | Exist_AdditionsR99 = 1 |  : AdditionsR99 | Exist_PFI = 0 |  : End AdditionsR99 | Padding = 3|43|43|43|43|43|
 DCSN1 INFO csnStreamDecoder (type=8): PayloadType = 1 | spare = 0 | R = 0 | MESSAGE_TYPE = 8 | DOWNLINK_TFI = 0 | MS_OUT_OF_MEMORY = 0 | Exist_EGPRS_ChannelQualityReport = 1 |  : EGPRS_ChannelQualityReport |  : EGPRS_BEP_LinkQualityMeasurements | Exist_MEAN_CV_BEP_GMSK = 0 | Exist_MEAN_CV_BEP_8PSK = 1 | MEAN_BEP_8PSK = 31 | CV_BEP_8PSK = 7 | : End EGPRS_BEP_LinkQualityMeasurements | C_VALUE = 58 |  : EGPRS_TimeslotLinkQualityMeasurements | Exist_BEP_MEASUREMENTS = 0 | Exist_INTERFERENCE_MEASUREMENTS = 0 | : End EGPRS_TimeslotLinkQualityMeasurements | : End EGPRS_ChannelQualityReport | Exist_ChannelRequestDescription = 1 |  : ChannelRequestDescription | PEAK_THROUGHPUT_CLASS = 6 | RADIO_PRIORITY = 0 | RLC_MODE = 0 | LLC_PDU_TYPE = 1 | RLC_OCTET_COUNT = 62 | : End ChannelRequestDescription | Exist_PFI = 0 | Exist_ExtensionBits = 0 |  : EGPRS_AckNack | Desc = 0 |  : Desc | FINAL_ACK_INDICATION = 0 | BEGINNING_OF_WINDOW = 1 | END_OF_WINDOW = 1 | STARTING_SEQUENCE_NUMBER = 1187 | Exist_CRBB = 0 | URBB = 127 | URBB = 255 | URBB = 255 | URBB = 238 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 | URBB = 0 |  : End Desc | : End EGPRS_AckNack | Padding = 
+DCSN1 INFO csnStreamDecoder (RAcap): MS_RA_capability_value { | Choice MS_RA_capability_value_Choice = 1 | u.Content length = 29 | offset = 4 | RF_Power_Capability = 1 | Exist_A5_bits = 0 | ES_IND = 1 | PS = 0 | VGCS = 0 | VBS = 0 | Exist_Multislot_capability = 1 |  : Multislot_capability | Exist_HSCSD_multislot_class = 0 | Exist_GPRS_multislot_class = 1 | GPRS_multislot_class = 3 | GPRS_Extended_Dynamic_Allocation_Capability = 0 | Exist_SM = 0 | Exist_ECSD_multislot_class = 0 | Exist_EGPRS_multislot_class = 1 | EGPRS_multislot_class = 0 | EGPRS_Extended_Dynamic_Allocation_Capability = 0 | Exist_DTM_GPRS_multislot_class = 0 | : End Multislot_capability | Exist_Eight_PSK_Power_Capability = 0 | COMPACT_Interference_Measurement_Capability = 0 | Revision_Level_Indicator = NULL | UMTS_FDD_Radio_Access_Technology_Capability = NULL | UMTS_384_TDD_Radio_Access_Technology_Capability = NULL | CDMA2000_Radio_Access_Technology_Capability = NULL | UMTS_128_TDD_Radio_Access_Technology_Capability = NULL | GERAN_Feature_Package_1 = NULL | Modulation_based_multislot_class_support = NULL | GMSK_MultislotPowerProfile = NULL | EightPSK_MultislotProfile = NULL | MultipleTBF_Capability = NULL | DownlinkAdvancedReceiverPerformance = NULL | ExtendedRLC_MAC_ControlMessageSegmentionsCapability = NULL | DTM_EnhancementsCapability = NULL | PS_HandoverCapability = NULL | MS_RA_capability_value } | 
 DCSN1 INFO csnStreamDecoder (RAcap): MS_RA_capability_value { | Choice MS_RA_capability_value_Choice = 1 | u.Content length = 21 | offset = 4 | RF_Power_Capability = 1 | Exist_A5_bits = 0 | ES_IND = 1 | PS = 0 | VGCS = 0 | VBS = 0 | Exist_Multislot_capability = 1 |  : Multislot_capability | Exist_HSCSD_multislot_class = 0 | Exist_GPRS_multislot_class = 1 | GPRS_multislot_class = 3 | GPRS_Extended_Dynamic_Allocation_Capability = 0 | Exist_SM = 0 | Exist_ECSD_multislot_class = 0 | Exist_EGPRS_multislot_class = 1 | DCSN1 ERROR csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at EGPRS_multislot_class (idx 31): End Multislot_capability |