This function tries to get an accurate name for the message even if
the parsing has been aborted due to message errors.
The patch also moves the settings of the BSSGP related fields in
parse_ctx from behind to the front of bssgp_tlv_parse, to get more
information in the case of failure. This is now consistent with the
handling of the llc and g48_hdr fields.
Id addition, gprs_gb_log_parse_context now uses the new function to
derive a more accurate message name.
Ticket: OW#1307
Sponsored-by: On-Waves ehf
Currently it is possible to set the secondary SGSN NSEI to the same
value like the (primary) SGSN NSEI. This leads to undefined behaviour
and is hard to recognize.
This patch adds checks to either NSEI configuration command to refuse
conflicting values.
Ticket: OW#1306
Sponsored-by: On-Waves ehf
Currently, ptmsi_enc and new_ptmsi_enc point to the beginning of the
mobile identity. Since all P-TMSI in 04.08 (MM) are encoded this way (1
byte header + 4 byte P-TMSI value). This is different to the P-TMSI
encoding in 08.18 (BSSGP), where the P-TMSI is encoded into 4 byte
without MI header.
This patch changes the code to use pointers to the P-TMSI value,
which is encoded in the same way in both specifications.
Sponsored-by: On-Waves ehf
Currently BSSGP PTP messages are silently dropped when the BVCI is
not known and patching is enabled. The nanoBTS will not recognize
this and continue to send messages on the BVCI. If it receives a
STATUS(BVCI unknown) instead, it will start a BVC reset procedure
instead.
This patch modifies gbprox_rx_ptp_from_bss() to return a
STATUS(BVCI unknown) to the BSS instead of dropping the message.
Sponsored-by: On-Waves ehf
Currently the parse expects a 'MS network capability' IE with
2 <= length <= 3 which is compliant to GSM 04.08, 9.4.1 but not to
GSM 24.008, 9.4.1 which specifies 3 <= length <= 9. Thus the parser
rejects messages with a length >= 4 (including length field).
This patch relaxes the length check to accept either range by
requiring 2 <= length <= 9.
Ticket: OW#1258
Sponsored-by: On-Waves ehf
Currently one regexp ('patching') is used for all matching.
This patch adds a second category 'routing' which is exclusively used
for SGSN selection. It also adds a corresponding VTY command:
- match-imsi patching RE : MS related patching (currently APN)
- match-imsi routing RE : Select secondary SGSN on match only
- no match-imsi : Clear all filter expressions
Ticket: OW#1258
Sponsored-by: On-Waves ehf
This patch modifies the match-imsi command to allow for different
match categories (currently only 'patching' is provided).
- match-imsi patching RE : Filter APN patching and routing
- no match-imsi : Clear all filter expressions
Sponsored-by: On-Waves ehf
Currently, patch filter configurations are leaking between tests.
This adds a call to gbproxy_clear_patch_filter() to the end of each
test that calls gbproxy_set_patch_filter().
Sponsored-by: On-Waves ehf
The current implementation makes it difficult to add further match
expressions.
This patch adds a new struct gbproxy_match that contains the fields
needed for each match expression. The matches (config) and the
results (link_info) are stored in arrays. All related functions are
updated to use them. The old fields in the config structure are
removed.
Sponsored-by: On-Waves ehf
This patch adds assertions to check the LLC/GMM message received from
the gbproxy by the test framework within the function
test_gbproxy_ra_patching.
Sponsored-by: On-Waves ehf
Currently the only way to check, whether the right message have been
generated is to look into the generated text output. This is
error-prone if there are many messages.
This patch adds a way to optionally store all received messages into
a FIFO. They can then be checked by calling expect_msg() which
removes the first message from the FIFO and returns a pointer to it
or NULL if there is none. The pointer is only valid until the next
call to this function.
A few convenience functions are added to check for common message
types:
- expect_gmm_msg checks for certain GSM 04.08 messages in LLC/GMM
- expect_llc_msg checks for arbitrary LLC messages in BSSGP/UD
- expect_bssgp_msg checks for arbitrary BSSG messages
Each of their arguments can be set by MATCH_ANY to ignore it while
matching. On success, they return a pointer to a statically
allocated struct containing the pointer to the msg and the full parse
context.
Recording is enabled by setting the global variable received_messages
to a pointer to a struct llist_head. It can be disabled again by
setting it to NULL.
Sponsored-by: On-Waves ehf
Currently the pointers are computed by adding an offset to the new
message's _data pointer even when the original pointer is NULL.
This leads to invalid pointers in the copied msgb.
This patch adds a NULL check to each computation such that NULL
pointers are not adjusted.
Sponsored-by: On-Waves ehf
This patch adds und uses the function gbproxy_gsm48_to_peer() which
takes a GSM 04.08 message, encapsulates it in BSSGP and LLC, and
sends it to the BSS peer. This function increments vu_gen_tx_bss
which is now used instead of imsi_acq_retries to set the N(U) of the
outgoing message.
Since imsi_acq_retries isn't currently incremented before a Detach
Accept is generated, this patch also fixes the N(U) of such messages.
Sponsored-by: On-Waves ehf
Currently then link_info is not cleaned up completely, when
gbproxy_unregister_link_info is called.
This patch adds a function gbproxy_reset_link that must be defined
externally. This is done in gb_proxy.c, where it resets the IMSI
acquisition.
Sponsored-by: On-Waves ehf
That message is currently ignored but should invalidate the TLLI and
de-register the logical link instead.
This patch extends the parser to recognize such messages and to set
the invalidate_tlli flag.
Sponsored-by: On-Waves ehf
The TLLI should also be invalidated:
- when an Attach Reject info is received from the SGSN
- when an Attach Req is immediately followed by a Detach Req
- when an Attach Req is immediately followed by an MT detach
procedure
To verify that, this patch adds corresponding message sequences to
the test.
Sponsored-by: On-Waves ehf
This fixes the IMSI length assertion, which currently uses a
greater-or-equal than zero comparison which always yields true. It is
replaced by a greater than zero check.
Fixes: Coverity CID 1239442
Sponsored-by: On-Waves ehf
A single test case still uses time() to obtain the reference time.
This commit fixes this by using the 'now' variable instead, that
contains a fixed time value and does therefore not depend on when the
test is executed.
Sponsored-by: On-Waves ehf
Currently time() is used for age calculations. This time source
may jump either forwards or backwards in time (NTP update, leap
seconds).
This patch replaces the use of time() by using
clock_gettime(CLOCK_MONOTONIC) instead.
Sponsored-by: On-Waves ehf
Don't return a link_info if TLLI is 0 resp. P-TMSI is 0xffff. These
values are used for uninitialised or cleared fields and can possibly
match several entries.
Sponsored-by: On-Waves ehf
Since the (former) TLLI list has developed into a logical link list,
related commands are renamed accordingly.
- tlli-list * -> link-list *
- delete-gbproxy-tlli * -> delete-gbproxy-link *
- show gbproxy tllis -> show gbproxy links
Sponsored-by: On-Waves ehf
This field in struct gbproxy_patch_state has involved and holds a
list of all tracked logical links now. Thus the name is modified
accordingly.
Sponsored-by: On-Waves ehf
Currently in many places where 'tlli' (Temporary Logical Link
Identifier) within identifiers is used, the logical link itself is
meant instead. For instance, the tlli_info contain information about
an LLC logical link including up to four individual TLLI.
To avoid confusion between these concepts, this patch replaces all
'tlli_info' by 'link_info' and a few 'tlli' by 'link'.
Sponsored-by: On-Waves ehf
This patch replaces 'tlli' by 'tlli_info' within the following
function identifiers:
- gbproxy_delete_tlli
- gbproxy_delete_tllis
- gbproxy_remove_stale_tllis
- gbproxy_touch_tlli
- gbproxy_unregister_tlli
- gbproxy_remove_matching_tllis
- gbproxy_find_tlli -> gbproxy_tlli_info_by_tlli
- gbproxy_find_tlli_by_* -> gbproxy_tlli_info_by_*
These functions refer to the whole logical link info rather than to a
certain TLLI. So they are renamed to be named consistently with
gbproxy_attach_tlli_info and others.
Sponsored-by: On-Waves ehf
The function gbproxy_imsi_acquisition() has a parameter sgsn_nsei
that is alyways equal to tlli_info->sgsn_nsei (if tlli_info is not
NULL).
This patch removes this parameter from gbproxy_imsi_acquisition() and
gbproxy_flush_stored_messages() and accesses tlli_info->sgsn_nsei
instead within these functions.
Sponsored-by: On-Waves ehf
This patch renames gbproxy_check_tlli() to
gbproxy_imsi_matches() and struct tlli_info's
enable_patching to imsi_matches.
It's meant to be more obvious and consistent this way.
Sponsored-by: On-Waves ehf
Currently the number of iterations when creating a P-TMSI/TLLI is not
limited. It is nevertheless very unlikely that the loop will not
terminate. On the other hand, the number of iterations of every loop
should have an upper bound (loop variant) which wouldn't be the case
here if an arbitrary random generator was used.
This patch limits the number of iterations to 23 and logs an error if
the creation of the indentifier was aborted due to this limit.
Sponsored-by: On-Waves ehf
Currently the IMSI acquisition is not restarted when a RA Update
Request is received. This leads to repeated N(U) in the generated
Ident Request message, which in turn causes the MS to drop the
second of these message. This is bad, when the first Ident Response
has been lost between MS and gbproxy.
This patch changes gbproxy_imsi_acquisition() to handle RA Update
Request messages like Attach Requests.
Sponsored-by: On-Waves ehf
When a MS is state GMM_REGISTERED enters a new RA, it sends a RA
Update Request which is then handled by a gbproxy that possibly
doesn't have a matching tlli_info. In this case, depending on the
configuration an identification procedure to acquire the IMSI must be
started.
This adds tests to test_gbproxy_imsi_acquisition():
- IMSI acquisition triggered by a RA Update Request message
- Reaction to repeated RA Update Request messages, like it could be
caused by packet loss between PCU and gbproxy.
Sponsored-by: On-Waves ehf
On a Detach/Re-attach cycle the Address Sanitizer detected a
use-after-free kind of problem. That is because we tried to
destroy the LLME twice. The first time it is destroyed as part
of the Detach handling ans the second time it is destroyed as
part of destroying the old MM context.
In case the GPRS GMM detach message is lost the SGSN needs
to reply besides not having a MM entry.
The alternative would have been to add NULL checks for all
usages of ctx->llme which would not have helped with the
readability.
Sponsored-by: On-Waves ehf
For jitter, transit and packet loss we should count the data
that arrived and not the data we send towards the remote. This
is changing the jitter timings to what they were before the
re-factoring.
For forced timing we might willingly add jumps in the sequence
number but for jitter and packet loss we are more interested
in the data that traveled through the wire/air.
The Annex A code has a probation period but we don't have it. When
starting with seq_no==0 do not assume that the sequence numbers
have wrapped. Do it by moving the entire checking code into the
else.
mgcp_patch_and_count has grown due supporting linearizing timestamps,
ssrc and other things for equipment like the ip.access nanoBTS. Fight
back and move the Annex A code into a dedicated method.
The result is updated as we now count after all the patching and for
the Annex A code no change in SSRC can be detected.
Before the old code allowed to specify "timeout-ping bla" which
would be parsed as '0' which would trigger a flood of pings. Use
the VTY code to parse it as a number.
Currently when gprs_llgmm_reset() is invoked an XID reset is sent but
the local LLC parameters (e.g. V(U)) are not cleared (see GSM 04.64,
8.5.3.1). This can lead to discarded messages on the SGSN side.
This patch modifies gprs_llgmm_reset to clear vu_send, vu_recv,
oc_ui_send, oc_ui_recv.
Sponsored-by: On-Waves ehf
Currently the SGSN side message's TLLI are searched without checking
the originating SGSN. This leads to collisions if both SGSN use the
same P-TMSI for different MS.
With this patch, the SGSN NSEI is stored within the tlli_info and is
used in comparisons to separate the namespaces.
Note that this type of collision cannot happen with BSS numbers,
since the tlli_info are already separated and stored per (BSS) peer.
Sponsored-by: On-Waves ehf
This patch extends test_gbproxy_secondary_sgsn() by the establishment
of a third MS connection using a P-TMSI that has been assigned by the
other SGSN already. It is expected that the entries do not
interfere and are properly retrieved.
Note that these collisions are not handled properly yet.
Sponsored-by: On-Waves ehf
Currently it is possible to create serveral entries referring to the
same P-TMSI/TLLI by using P-TMSI assigment via Attach Accept or
RA Update Accept messages. This can lead to the use of the wrong
tlli_info.
This patch adds gbproxy_remove_matching_tllis() that removes all
conflicting entries. This function is called after the P-TMSIs and
the resulting TLLIs has been set up.
Sponsored-by: On-Waves ehf
This tests P-TMSI assignment when P-TMSI patching is disabled. A test
with colliding P-TMSI in Attach Accept messages is included.
Note that P-TMSI collisions are not handled properly yet.
Sponsored-by: On-Waves ehf
Since this message puts the MS into DEREGISTERED state (like a detach
procedure), this message is parsed and the invalidate_tlli field is
set accordingly.
Sponsored-by: On-Waves ehf
Jacob Erlbeck
Daniel Willmann