This is a left-over from the initial system where no PDP
was provided by the system. For now if there is a subscr
attached and no PDP context provisioned. He is not allowed
to have a data connection.
Update the testcase to create the pdp list entry more
early with a wildcard and then change it to a specific
match.
Include the hlr-Number of the subscriber in the CDR. This is useful
for debugging and understanding which equipment was used during the
test. In contrast to the MSISDN the '+' is emitted as the number
must be in international format already.
Copy the hlr-Number into the sgsn_data and use it during
the purgeMS. There is no unit test that looks at the data
we send so I manually verified this by looking at the output.
Below is the output of the test that purges the subscriber.
<000f> gprs_subscriber.c:170 SUBSCR(123456789012345) Sending GSUP, will send: 0c 01 08 21 43 65 87 09 21 43 f5 09 07 91 83 61 26 31 23 f3
We have verified/selected the APN. Either based on the subscriber
data, a global APN match. But at least this SGSN has looked at
what the MS has asked for and then selected a matching GGSN.
Clear LAC/RAC with pre-defined value in the RAI.
3GPP 29.060 v7.17.0 section 7.3.1 page 23:
"The SGSN may include the Routeing Area Identity (RAI) of the
SGSN where the MS is registered. The MCC and MNC components shall
be populated with the MCC and MNC, respectively, of the SGSN
where the MS is registered. The LAC and RAC components shall be
populated by the SGSN with the value of 'FFFE' and 'FF',
respectively.”
Most SGSNs pass the IMEI(SV). We currently only enquire about
the IMEI and then pad the 'SV' with 1111b (thanks to the encoding
routine). Sadly it insists on always writing the length which
means we have to memmove the data around by a single octet.
Manually verified using the pcu-emu and looking at the trace
using wireshark.
Give the GGSN another opportunity to determine which tarif
to apply for the SGSN/subscriber. This code assumes tha the
RAN is a GERAN system but the assumption has been made in
other places as well.
For PDP context creation we always want to include the RAI
for the current mmctx. This might help commercial GGSNs to
determine which charging to apply.
The charging_id is provided by the GGSN. Copy it into the CDR
part of the data structure so it will remain present until after
the pdp context has been deleted.
Make it possible to set a filename to use for the CDR. By
default no CDR will be generated. Forbid to set the interval
of 0 seconds as this will cause a lot of work. Add a very
basic VTY test.
This is consuming the new signals and allows to install several
different CDR/observing/event/audit modules in the future. For
getting the bytes in/out the code would have had to undo what the
rate counter is doing and at the same time adding a "total" to
the ratecounter didn't look like a good idea, the same went for
making it a plain counter.
Begin writing the values one by one and open/closing a new FILE
for every log messages. This is not efficient but easily deals
with external truncation/rotation of the file (no fstat for and
checking the links and size). As usual we will wait and see if
this is an issue.
Add some new members to our PDP context structure to see what it
is about.
In case there is a subscr attached to the MM context and there
is an encoded MSISDN we will attempt to decode it and in case
of an international number prepend a '+'. Assume that the array
size of gsm_mmcc_called->number is as big as ctx->msisdn for the
strncpy.
If QoS is only three bytes it does not include the allocation/
retention policy. Otherwise it does. Copy it depending on that.
We should have a macro for the clamping to reduce code duplication.
The insanity does come from the MAP data and this seems to be
the easiest in terms of complexity. It is an array of bytes that
is transported from MAPProxy to the SGSN and then simply forwarded.
The case of more than three bytes is neither unit nor manually
tested so far.
sgsn_create_pdp_ctx should use the subscribed QoS. When selecting
the PDP context we inject the QoS to be used into the TLV structure
and use it during the request. Assume a "qos-Subscribed" structure
only with three bytes and prepend the Allocation/Retention policy
to the request.
The MSISDN should be present for "security" reasons in the first
activation of a PDP context. Take the encoded MSISDN, store it for
future use and then put it into the PDP activation request.
The MM Context contains a field for a decoded MSISDN already. As
we need to forward the data to the GGSN I want to avoid having to
store TON and NPI in another place. Simply store the data in the
encoded form.
When handling an incoming GSUP cancellation request, the cancel_type
if effectively ignored, such that is always handled as
GPRS_GSUP_CANCEL_TYPE_UPDATE and never as WITHDRAW.
This commit fixes the expression used to set the variable
is_update_procedure.
Fixes: Coverity CID 1267739
Sponsored-by: On-Waves ehf
For most configurations we don't address multiple GGSNs but
only want to enforce a list of APNs. In the future we might
add a special global GGSN context but not right now.
Fixes: SYS#593
This reverts commit f81cacc681.
Since the PURGE MS retry mechanism had been removed, this feature
is not used anymore. It just makes the code more complex.
Conflicts:
openbsc/include/openbsc/gprs_sgsn.h
openbsc/src/gprs/gprs_subscriber.c
openbsc/tests/sgsn/sgsn_test.c
Currently the APN IE in the Activate PDP Contex Request and the PDP
data that is stored with the subscriber is ignored completely.
This commit adds the sgsn_mm_ctx_find_ggsn_ctx that checks the APN IE
against the subscriber's PDP data entries if both are present. If
there is no match, the request is rejected.
If an APN IE has not been included but PDP data entries are present,
the function checks all of these entries against the static 'apn'
configuration to find a suitable entry.
If an APN has not been determined so far and any APN is allowed, the
configuration is checked with an empty APN string, to allow for
default configurations based on the IMSI prefix only.
If nothing of this succeeded but the request wasn't rejected either,
and there is no 'apn' configuration at all or if any APN is allowed
but a default configuration ist not present, the GGSN with id 0 is
used (if present).
Otherwise the request is rejected ('missing APN').
Ticket: OW#1334
Sponsored-by: On-Waves ehf
This commit adds the exported functions apn_ctx_find_alloc,
apn_ctx_free, apn_ctx_by_name, and apn_ctx_match to manage and
retrieve APN to GGSN mappings.
The following VTY commands are added to 'config-sgsn':
- apn APN ggsn <0-255>
- apn APN imsi-prefix PREFIX ggsn <0-255>
which maps an APN gateway string to an SGSN id. The SGSN must be
configured in advance. When matching an APN string, entries with a
leading '*' are used for suffix matching, otherwise an exact match is
done. When a prefix is given, it is matched against the IMSI. If
several entries match, a longer matching IMSI prefix has precedence.
If there are several matching entries with the same PREFIX, the entry
with longest matching APN is returned.
Ticket: OW#1334
Sponsored-by: On-Waves ehf
Currently the PDP info that is transmitted via GSUP is just parsed
and then discarded.
This commit adds a new data structure sgsn_subscriber_pdp_data and
maintains a list of those in sgsn_subscriber_data. The PDP data is
copied from an incoming GSUP UpdateLocationResult message. If that
message contains the PDPInfoComplete flag, the list is cleared before
new entries are added. The 'show subscriber cache' output now also
shows the PDP data entries.
Note that the InsertSubscriberData message is still not supported.
[hfreyther: Added talloc_free in gprs_subscr_pdp_data_clear]
Sponsored-by: On-Waves ehf
This commit adds a check after a GSUP message has been decoded
whether it is an error message and does not contain a cause value.
If his is the case, the cause value is set to 'Network failure', so
that this cause if effectively the default value for error messages.
Sponsored-by: On-Waves ehf
Currently gprs_subscr_rx_gsup_message returns immediately after it
detects that an IMSI has not been given in the received GSUP message.
While this is ok for responses (result or error), a request should
always be answered.
This commit adds code to reply with a corresponding error message
("Invalid mandatory information") when it receives a request without
an IMSI.
Note that the generated error message will not contain an IMSI either.
Sponsored-by: On-Waves ehf
The cancellation type that is part of the UpdateCancellation message
is currently ignored.
This patch adds the missing glue between the existing GSUP and GMM
support. If the type is not present or has the value updateProcedure
the subcriber and MM context are siliently removed. Otherwise, a
message with cause 'implicitly detached' is sent to the MS. Since the
real cause is not known (the specification neither added a cause IE
nor defined a static cause value), the MS may get the real cause in
the following AttachRej.
Added VTY commands:
- update-subscriber imsi IMSI cancel update-procedure
- update-subscriber imsi IMSI cancel subscription-withdraw
the old form without the cause is no longer supported.
Sponsored-by: On-Waves ehf
Currently the subscr entry is no longer present, when PURGE MS
ERROR/RESULT arrives. In this case, an unspecific notice is logged
('unknown IMSI'). This clutters up the logfile with notices even in
perfectly normal operation.
This commit changes the code path that is used when a subscr cannot
be found for an incoming GSUP message. A check for PURGE MS RESULT
and ERROR is added and gprs_subscr_handle_gsup_purge_no_subscr is
called for these messages instead of gprs_subscr_handle_unknown_imsi.
Sponsored-by: On-Waves ehf
Currently the keep_in_ram flag is explicitely reset in
gprs_subscr_cleanup to cover the case, that the VTY 'create'
sub-command has been used to create the subscriber entry.
This commit completely removes keep_in_ram handling from
gprs_subscriber.c and adds a VTY 'destroy' sub-command to reset the
flag and remove the entry. So 'create' and 'destroy' can be used to
manager sticky entries that are kept even when a location
cancellation is done.
Added VTY command:
- update-subscriber imsi IMSI destroy
Sponsored-by: On-Waves ehf
Currently the MM context cleanup code is distributed over several
functions. sgsn_mm_ctx_free not only frees data structure but also
eventually stops the timer and does the subscriber clean-up.
mm_ctx_cleanup_free (gprs_gmm.c) cleans up the PDP contexts and
unassign the TLLI.
This commit moves the cleanup code from both functions into a new
unifying function sgsn_mm_ctx_cleanup_free that cares about the
clean-up of all related sub-systems.
Sponsored-by: On-Waves ehf
Currently, sgsn_update_subscriber_data can be called with mmctx ==
NULL and will find and associate the right context (if present) based
on the subscriber's IMSI. This will not happen in regular use
any more, since sgsn_update_subscriber_data will only be called when
subscribers are used (auth mode 'remote') and in this case
gprs_subscr_get_or_create_by_mmctx will already be called by
sgsn_auth_request. Therefore, MM context and subscriber are always
associated except for some test cases and experimental VTY usage.
The current implementation of sgsn_update_subscriber_data also causes
additional complexity for the deletion on MM contexts to avoid a
ipossible double-free MM contexts.
This commit removes the MM context <-> subscriber association code
from sgsn_update_subscriber_data. That function must always be called
with mmctx != NULL, now. To avoid problems with VTY and test usage,
the calling subscriber function now only call
sgsn_update_subscriber_data when mmctx != NULL, since the purpose of
that function is to update that state of an existing MM context after
subscriber data has been changed.
Sponsored-by: On-Waves ehf
The definition of subscr_put in gb_proxy_main.c will break linking if
symbols from libcommon are used. Since subscr_put is in libcommon,
there is no need for this dummy definition anymore.
This patch removes the dummy definition.
Adresses:
../../src/libcommon/libcommon.a(gsm_subscriber_base.o): In function `subscr_put':
/home/jerlbeck/git/build/openbsc/openbsc/src/libcommon/gsm_subscriber_base.c:90: multiple definition of `subscr_put'
gb_proxy_main.o:/home/jerlbeck/git/build/openbsc/openbsc/src/gprs/gb_proxy_main.c:56: first defined here
Sponsored-by: On-Waves ehf
Currently the sgsn_mm_ctx_free contains code to reset the mm->subscr
field that is also present in gprs_subscr_cleanup, which is called
directly afterwards.
This commit modifies the code path, so that the cleanup is done by
the gprs_subscr_cleanup function. The additional reference counter
increment is needed, since mm->subscr->mm->subscr (which is the same
like mm->subscr) will be reset (and unref'd) within
gprs_subscr_cleanup. Because the local variable subscr in
sgsn_mm_ctx_free is an additional pointer to the subscriber object,
it is consequent to adjust the reference counter when the assignment
is done.
Sponsored-by: On-Waves ehf
The old name is somewhat misleading. The function is rather preparing
the subscriber for a subsequent subscr_free, that is possibly invoked
by a subscr_put. It detaches the subscriber from the MM context and
optionally invokes a PURGE_MS procedure. Therefore the _cleanup
suffix is chosen (see mm_ctx_cleanup_free).
Sponsored-by: On-Waves ehf
Currently, the return value of gsup_client_connect is checked whether
it is < 0 and != -EINPROGESS. Since gsup_client_connect will only
return a negative value on a few permanent errors (not including
EINPROGRESS), rc is always != EINPROGRESS.
This patch removes the explicit check againt -EINPROGRESS and just
leaves the check rc < 0.
Sponsored-by: On-Waves ehf
Currently the size argument of strncpy is set to sizeof(mm->imsi) in
some places. If the source IMSI string is too long, the terminating
NUL byte in the static mm->imsi field gets overwritten.
This patch limits the size to sizeof(mm->imsi)-1, so that the last
byte of the buffer (that has been initialized to 0) is not
overwritten.
Fixes: Coverity CID 12065751, 12065754, 1206575
Sponsored-by: On-Waves ehf
Currently gprs_subscr_delete implicitely calls subscr_put, which
makes the code more complex than necessary (additional subscr_get) in
a few places. It also makes it more difficult to see, whether get/put
are balanced within a function. In addition, the functions are not
named consistently (gprs_subscr_delete vs.
gprs_subscr_put_and_cancel).
This commit changes the semantics of gprs_subscr_delete and
indirectly of gprs_subscr_put_and_cancel to not call subscr_put on
their argument, but to leave that for the caller to do it
explicitely.
It renames gprs_subscr_put_and_cancel to gprs_subscr_cancel to
reflect that change in the name, too.
Sponsored-by: On-Waves ehf
The subscriber cache would help in case:
* GPRS DETACH, GPRS ATTACH. In that case we might still
have some cached authentication tuples we avoid another
sendAuthenticationInfo request.
* After a detach the cache expiry would make sure to
eventually send a purgeMS to the HLR (which might be
ignored).
At the same time to make the cache work we will need to
make sure to start and stop timers. In case we don't
start we might accumulate subscribers. I am afraid that
the above two benefits do not outweight the complexity
of this implementation.
Currently old LLMEs and MM contexts that haven't been explicitly
detached or cancelled are not removed until another request with the
same IMSI is made. These stale entries may accumulate over time and
severely compromise the operation of the SGSN.
This patch implements age based LLME expiry, when the maximum age has
been reached, the corresponding MM context is cancelled. If such an MM
context doesn't exist, the LLME is unassigned directly.
The implementation works as follows.
- llme->age_timestamp is reset on each received PTP LLC message
- sgsn_llme_check_cb is invoked periodically (each 30s)
- sgsn_llme_check_cb sets the age_timestamp to the current time if
it has been reset
- sgsn_llme_check_cb computes the age and expires the LLME if
it exceeds gprs_max_time_to_idle()
Ticket: OW#1364
Sponsored-by: On-Waves ehf
[hfreyther: Fix typo in comment LMME -> LLME]
Currently the T3312 timer is directly set as encoded value when
generating the Attach/RAU Accept messages.
This patch adds GSM0408_T3312_SECS and uses it to set the
information element's value.
Sponsored-by: On-Waves ehf
Currently this optional IE is omitted, so that the optional
'Requested READY timer value' of the corresponding Request message
is used by the MS (or the default value if this IE is not used).
This patch extends gsm48_tx_gmm_att_ack and gsm48_tx_gmm_ra_upd_ack
to always include the IE set to the default value of T3312 (44s,
see GSM 04.08, table 11.4a).
Ticket: OW#1364
Sponsored-by: On-Waves ehf
Currently, all GPRS timer values are hard-coded. To make these values
configurable in seconds and to show them, conversion functions from
and to seconds are needed.
This patch adds gprs_tmr_to_secs and gprs_secs_to_tmr_floor. Due to
the limited number of bits used to encode GPRS timer values, only a
few durations can be represented. gprs_secs_to_tmr_floor therefore
always returns the timer value that represents either the exact
number (if an exact representation exists) or the next lower number
for that an exact representation exists.
Sponsored-by: On-Waves ehf
Currently the gsup_client_connect return 0 if the call to
ipa_client_conn_open was successful and -errno otherwise. This makes
it difficult for the caller to determine, whether the the whole
operation has been cancelled (currently on EBADF, ENOTSOCK,
EAFNOSUPPORT, EINVAL) or whether the GSUP client will retry to
connect after a timeout. This will cause gprs_gsup_client_create to
destroy the GSUP client object, even if the error might be temporary.
This patch changes the function to return 0 if (and only if)
ipa_client_conn_open was successful or the retry timer has been
started. Since the return value 0 doesn't guarantee, that a
subsequent call to gprs_gsup_client_send will succeed, this shouldn't
break anything.
Sponsored-by: On-Waves ehf
This patch drops the following commands:
- update-subscriber imsi IMSI insert authorized <0-1>
- update-subscriber imsi IMSI commit
since they are already covered by the 'update-location-result'
sub-command, except that this command doesn't create an new entry if
none is found with the given IMSI.
It adds the following command:
- update-subscriber imsi IMSI create
which can be used to create a new entry.
Sponsored-by: On-Waves ehf
Currently '\n' is used to end lines in the VTY output string
constants instead of inserting VTY_NEWLINE. This leads to incorrect
line starts in error messages.
This patch fixes that accordingly.
Sponsored-by: On-Waves ehf
Currently an error_cause of 0 is being used to indicate normal
operation. Albeit this is not a defined GMM cause, the value is not
explicitly reserved.
This commit adds the macro SGSN_ERROR_CAUSE_NONE and uses it for
initialisation (instead of relying on talloc_zero) and comparisons.
The value is set to -1 to be on the safe side. The VTY code is
updated to set the error_cause when using the
'update-subscriber imsi IMSI update-location-result CAUSE' command.
Sponsored-by: On-Waves ehf
Currently the access to subscr->sgsn_data->error_cause is not
protected against subscr == NULL like it is done in other code paths
of sgsn_auth_update.
This commit adds a conditional to avoid a NULL-dereference.
Fixes: Coverity CID 1264589
Sponsored-by: On-Waves ehf
Currently sgsn_alloc_ptmsi uses rand() to get a new P-TMSI and then
sets to upper 2 MSB. Therefore there is no lower limit of the
distance between 2 identical P-TMSI.
This patch changes the implementation to discard any random value
above 2^30 and to generate a new random number in that case until a
fitting number is found (or a repetition limit is reached). This way,
all number below 2^30 within the PRNG's period are used.
Ticket: OW#1362
Sponsored-by: On-Waves ehf
Currently no GSUP LocationCancellationResult message is sent back to
the peer (HLR), if the procedure succeeded at the SGSN's side.
This patch adds the missing message and put the whole request
handling of this procedure into a separate function.
Ticket: OW#1338
Sponsored-by: On-Waves ehf
Currently gprs_subscr_rx_gsup_message creates a subscriber entry if
such an entry doesn't exist for the IMSI within an
InsertSubscriberData GSUP message. This behaviour is not compliant to
GSM 09.02, 20.3.3.2 (Subscriber data management/SGSN) where it is
defined, that an error ("Unidentified subscriber") shall be returned.
This patch removes the case distinction, so that an existing
subscriber entry is required for all incoming GSUP messages.
Sponsored-by: On-Waves ehf
Currently, an incoming GSUP request message isn't answered at all if
it is not handled due to an error or missing implementation.
This patch adds GSUP error replies for these requests (and only for
requests). It also adds tests for these cases.
Note that several of these tests check for
GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL, which will have to be changed, when
the features are implemented.
Sponsored-by: On-Waves ehf
GSM 09.02, 19.4.1.4 mandates that no other MAP procedures shall be
started until the PURGE_MS procedure has been completed.
This patch implements this by adding corresponding state and checks
to gprs_subscr_purge, gprs_subscr_location_update, and
gprs_subscr_update_auth_info. If an Update Location or a Send Auth
Info Req procedure is not started because of blocking, the retry
mechanism is aborted to shorten the blocking time. The outstanding
Purge MS procedure itself is not aborted.
Sponsored-by: On-Waves ehf
Currently, when the PURGE_MS_REQ to the HLR gets lost (e.g. by a
connection or peer failure), the expired subscriber entry will not get
deleted.
This commit adds a retry mechanism then restarts the procedure after
a timeout (currently 10s). The maximum number of retries is limited
(currently to 3 PURGE_MS messages). If none of these procedures is
completed (either with success or error), the subscriber data is
deleted.
Sponsored-by: On-Waves ehf
When a subscriber entry is going to be deleted by SGSN and when the
subscriber info has been obtained from a remote peer via GSUP, the
peer should be informed before the entry is really deleted. For this
purpose, MAP defines the PURGE MS procedure (see GSM 09.02, 19.1.4).
This patch adds support for the PURGE_MS_REQ/_ERR/_RES messages and
invokes the procedure when the subscriber entry is going to be
removed. This only applies if GSUP is being used, the Update
Location procedure has been completed successfully, and the
subscriber has not been cancelled. The removal of the entry is
delayed until a PURGE_MS_RES or PURGE_MS_ERR message is received.
Note that GSM 09.02, 19.1.4.4 implies that the subscriber data is not
to be removed when the procedure fails which is not the way the
feature has been implemented.
Note that handling 'P-TMSI freezing' is not implemented.
Ticket: OW#1338
Sponsored-by: On-Waves ehf
This commit implements the encoding and decoding of the messages
- Purge MS Request
- Purge MS Error
- Purge MS Result
and adds corresponding tests.
Sponsored-by: On-Waves ehf
Set the expiry delay after the subscriber has been deleted (e.g. by
freeing the MM context). If cancelled, the subscriber will be deleted
immediately and no timeout will be set. If the expiry time is set to
SGSN_TIMEOUT_NEVER, no timer will be started and the subscriber entry
will be kept until it is cancelled.
The following VTY command is added to the sgsn node:
- subscriber-expiry-time <0-999999> set expiry time in seconds
- no subscriber-expiry-time set to SGSN_TIMEOUT_NEVER
The default is an expiry time of 0 seconds, which means that the
subscriber entries are wiped out immediately after an MM context is
destroyed.
Note that unused MM contexts are not expired yet. Therefore the
subscriber will only be expired after a successful MM detach.
Sponsored-by: On-Waves ehf
Currently the error causes MSC_TEMP_NOTREACH, NET_FAIL, and
CONGESTION are silently dropped to force the MS to continue. On the
other hand, GSM 04.08/24.008, 4.7.3.1.4 in combination with 4.7.3.1.5,
require the MS to retry the attachment procedure for cause codes
above 15 instead of disabling GPRS. All of the mentioned GMM causes
have codes above 15, so using a REJECT message including the cause
code is a better choice. This way, the retry algorithm based on T3311
(15s, 5 times) and T3302 (default 12min) could be used.
This patch modifies gprs_subscr_handle_gsup_auth_err and
gprs_subscr_handle_gsup_upd_loc_err to proceed like when the access
has beed denied, except that the corresponding subscriber's
information fields are not cleared.
This has been successfully tested which an iphone which enters a
retry loop as it is being described in the specification.
Sponsored-by: On-Waves ehf
To unify the layout of the logging messages in gprs_subscriber.c,
this patch replaces each LOGP by LOGGSUBSCRP, unless a non-NULL
pointer to a subscr is not available. In those cases, it uses
LOGMMCTXP if a pointer to an MM context is available or LOGP
otherwise.
Sponsored-by: On-Waves ehf
Currently the GSUP message handling function in gprs_subscriber.c and
the functions in gprs_gsup_messages.c are not consistent with respect
to the return codes if an error happens. Albeit all error return
codes are negative, the semantics of the absolute value are not
clearly defined. In addition, some return codes are not passed to the
calling function.
This path changes these functions to always return a negated GMM
cause value in case of errors. Return values of called parser
functions are not longer ignored.
Sponsored-by: On-Waves ehf
Currently always a cause with the meaning of 'access denied' is
assumed. gprs_subscr_handle_gsup_auth_err just clears the auth
triplets and the authorized flag before calling the update function.
gprs_subscr_handle_gsup_upd_loc_err only clears the authorized flag
and calls the update function. This means, that an MS will not retry
to attach even on temporary network errors.
This patch changes these functions to use the GSUP error cause value
to decide, whether to clear the corresponding subscriber fields, to
just continue with the corresponding update function, or to log,
ignore and not pass the cause to the MS in case the error is directly
related to the GSUP protocol. The subscriber's error_cause field is
updated, if the update function is going to be called. The
error_cause fielt is reset on non-error GSUP messages.
Sponsored-by: On-Waves ehf
This patch extends gsm0408_gprs_access_denied and
gsm0408_gprs_access_cancelled to accept GMM cause codes. These are
then passed to the MS, unless gsm0408_gprs_access_cancelled is called
with cause 0 (no error -> updateProcedure).
Since gsm0408_gprs_access_denied uses GMM_CAUSE_GPRS_NOTALLOWED if
the cause is not set, and the subscriber's error_cause is never set
(and thus always 0), the SGSN's behaviour does not change with this
patch.
Sponsored-by: On-Waves ehf
Conflicts:
openbsc/include/openbsc/gprs_sgsn.h
[hfreyther: Conflict due the removal of the unused
authenticate flag]
Currently the mapping between GSM 04.08 (GPRS) protocol specific
numbers and their textual description was put into gprs_gmm.c and not
exported.
This commit moves the mappings to a new file gsm_04_08_gprs.c,
renames some of them, and exports them via gsm_04_08_gprs.h.
The following identifiers are renamed to match the corresponding type
names:
- gmm_cause_names -> gsm48_gmm_cause_names
- gsm_cause_names -> gsm48_gsm_cause_names
Sponsored-by: On-Waves ehf
This commit adds a line to the output of 'show sgsn' if the GSUP
client has been initialized:
- Remote authorization: [not] connected to HOST:PORT via GSUP
Sponsored-by: On-Waves ehf
Currently, the reconnect mechanism relies on gsup_client_updown_cb
which in turn gets called based on the OS' view of connection state.
This patch adds a timer based PING mechanism that regularly sends
PING messages and forces a reconnect if a PONG message won't be
received until the next PING message is scheduled. The current ping
interval is 20s.
Sponsored-by: On-Waves ehf
Conflicts:
openbsc/src/gprs/gprs_gsup_client.c
[hfreyther: Conflicts due the potential memleak fix by me. Removed
another TODO from the code as we stop the ping/pong timer]
Currently the IPA CCM messages are not handled by the GSUP client.
This means, that the client doesn't answer to PING and ID_GET and
logs notices when receiving PONG or ID_ACK. At least the PING
functionality (remotely originated PING) shall be supported.
This patch extends gsup_client_read_cb by a call to
ipaccess_bts_handle_ccm. Only when the return code is 0, the message
is processed further and checked for an OSMO/GSUP message. ID_GET
messages are answered by a dummy description, where only the
unit_name is set to 'SGSN'.
Sponsored-by: On-Waves ehf
The ipa_client_conn_open function does not distinguish between a
connection being already established or waiting for establishment.
In either case, the application gets informed about the connection
state via the updown_cb. The 'up' parameter is only set, if
poll/select consider the socket as writable.
This patch handles both cases equally and fully relies on the
updown_cb to adjust the gsupc obejct state.
Sponsored-by: On-Waves ehf
Currently, messages are added to the tx queue even if the connection
is down for some reason and all of these messages are eventually sent
after a re-connect. The MS has probably sent several Attach Requests
while the connection was down and will continue doing so. Therefore
these stored messages could be dropped.
This patch clears the queue before re-connecting and also extends
gprs_gsup_client_send to return immediately, when the connection is
not established instead of calling ipa_client_conn_send.
Sponsored-by: On-Waves ehf
[hfreyther: Replaced
while (!llist_empty(&gsupc->link->tx_queue))
llist_del(gsupc->link->tx_queue.next);
with new libosmo-abis API]
Currently the GSUP connection to a server is not restarted if the
connection cannot be established or is terminated during operation.
This commit adds a timer based connection mechanism, basically
consisting of a timer callback that calls gsup_client_connect. The
timer is eventually triggered (up == 0) or cleared (up != 0) by
gsup_client_updown_cb. It adds calls to osmo_timer_del() to
gsup_client_connect and gprs_gsup_client_destroy. The latter is now
called instead of talloc_free in gprs_gsup_client_create on error to
be on the safe side.
Sponsored-by: On-Waves ehf
This flag is used to determine, whether the Update Location procedure
shall be invoked. This is currently only set, when the 'remote'
authorization policy is set. When the flag is set, sgsn_auth_update
will not never be called directly by sgsn_auth_request, if an Attach
Request procedure is pending, even if the remote connection fails for
some reason.
Sponsored-by: On-Waves ehf
Currently the flag 'authenticate' is managed per subscriber.
This patch replaces that flag by a global cfg.require_authentication
flag that enables/disables the use of the Auth & Ciph procedure for
every subscriber. The flag is set by the VTY, if and only if the
authorization policy is 'remote'.
The VTY command
- update-subscriber imsi IMSI insert authenticate <0-1>
is removed.
Sponsored-by: On-Waves ehf
This commit adds GSUP client configuration (via VTY), connection set
up, and real message sending.
The following configuration commands are added:
- gsup remote-ip A.B.C.D set server IP address
- gsup remote-port PORT set server TCP port
Ticket: OW#1338
Sponsored-by: On-Waves ehf
This commit adds the client code to get subscriber information from a
remote server. It provides an IPA over TCP connection to transmit and
receive GSUP messages.
Sponsored-by: On-Waves ehf
Currently the message structure is not cleared before the message is
parsed which can cause information leaking between messages if the
same gprs_gsup_message object is used. Especially list elements (auth
tuples and pdp info) are not replaced by an IE, but the IE is
appended.
This patch uses the assignment operator to clear gprs_gsup_message,
gsm_auth_tuple, and gprs_gsup_pdp_info before using them. This also
replaces the use of memcpy of the latter.
Sponsored-by: On-Waves ehf
Currently auth tuples are always appended to the lists when
gprs_gsup_decode is called with a gsup_msg structure. This makes a
test case fail, where the same gsup_msg is used again and again
without clearing it after each use.
Sponsored-by: On-Waves ehf
Currently, the gprs_gsup_decode function doesn't check the return
value of gprs_shift_v_fixed before using the value pointer. The
function fails, if the GSUP message length (not including IPA
headers) is 0. In this case, a segfault can happen, depending on the
value of the uninitialized 'value' pointer. The test case doesn't
trigger a segfault, but valgrind complains about reading
uninitialized data.
This patch adds a check for the return value that would return with
an error code if the shift function failed.
Sponsored-by: On-Waves ehf
This patch extends gprs_subscr_query_auth_info and
gprs_subscr_location_update to create GSUP messages with the help of
a static gprs_subscr_tx_gsup_message function. A corresponding
gprs_subscr_rx_gsup_message is added which takes a messages, gets the
subscr, and updates it accordingly.
Sponsored-by: On-Waves ehf
[hfreyther: Added a msgb_free gprs_subscr_tx_gsup_message]
This patch adds functions to encode and decode GSUP messages. This
does not include the layer 1 framing (IPA). The messages so far
supported are: send_auth_info_*, update_location_*,
location_cancellation_*.
Sponsored-by: On-Waves ehf
Currently the result of the osmo_hexparse function in
update_subscr_insert_auth_triplet is not handled correctly. There is
a misplaced leading exclamation mark in a few conditional
expressions. This effectively disables the error checks, as it is
noticed by Coverity ("Missing parentheses" followed by "Logically
dead code").
This patch removes the exclamation marks.
Fixes: Coverity CID 1260435 and CID 1260434
Sponsored-by: On-Waves ehf
This implements the MAP way of subscriber validation when the MS
tries to perform an Attach Request:
1. perform authentication (optionally invoke the sendAuthInfo
procedure), starts the Auth & Ciph procedure
2. perform update location
3. insert subscriber data
4. finish the update location
5. Attach Accept / Attach Reject
The authentication triplets are used and eventually updated if all of
them have been used.
This is currently accessible via the VTY interface by the following
commands:
- update-subscriber imsi IMSI update-auth-info
- update-subscriber imsi IMSI update-location-result (ok|ERR-CAUSE)
Sponsored-by: On-Waves ehf
This commit add data structures, functions, initialization, and VTY
commands for per subscriber authentication triplets.
The following VTY command is added:
- update-subscriber imsi IMSI \
insert auth-triplet <1-5> sres SRES rand RAND kc KC
Note that the triplets are not really used by the SGSN yet.
Sponsored-by: On-Waves ehf
Currently, when a BSSGP SUSPEND is received and the corresponding MM
context is already in the state GMM_REGISTERED_SUSPENDED, a
SUSPEND_NACK is returned which is not covered by GSM 08.18, 7.4.1.
The same goes for RESUME in the state GMM_REGISTERED_NORMAL.
This commit changes gprs_gmm_rx_suspend and gprs_gmm_rx_resume to not
complain (and thus answer a NACK) when the MM context is either in
GMM_REGISTERED_SUSPENDED or GMM_REGISTERED_NORMAL.
Note that GSM 08.18, 7.4.1 and 7.5.1 only mention to send an NACK if
the MS is not known. Even with this patch, the SGSN returns a NACK if
either the MS is unknown _or_ the MM context ist not in one of the
state GMM_REGISTERED_SUSPENDED and GMM_REGISTERED_NORMAL.
Sponsored-by: On-Waves ehf
Currently the parser functions for single information elements are
defined within gprs_gb_parse.c and not exported explicitely. In
addition they are named like libosmocore's TLV parser functions and
do not have a proper name prefix. Since it is planned to use them for
other protocols, they need to be globally accessible.
This patch moves them to gprs_utils.c and renames them.
The new names are:
lv_shift -> gprs_shift_lv
v_fixed_shift -> gprs_shift_v_fixed
lv_shift -> gprs_shift_lv
v_fixed_shift -> gprs_shift_v_fixed
In the long term, these functions should be moved to libosmocore (and
renamed again).
Sponsored-by: On-Waves ehf
This commit mainly extends sgsn_auth.c to use and support the
auth_state SGSN_AUTH_AUTHENTICATE. It will be activated when IMSI and
IMEI are available, authentication is required
(subscr->sgsn_data->authenticate is set), but the MM context is not
marked as authenticated. If the state has been set to
SGSN_AUTH_AUTHENTICATE and sgsn_auth_update() is called, the GMM
layer will be informed by invoking gsm0408_gprs_authenticate().
Sponsored-by: On-Waves ehf
Currently the Authentication and Ciphering procedure is not yet
invoked by the GMM layer.
This patch starts this procedure from within gsm48_gmm_authorize when
the mm->auth_state has been set to SGSN_AUTH_AUTHENTICATE and a call
to gsm0408_gprs_authenticate has been issued directly or indirectly
by the call to sgsn_auth_request.
Sponsored-by: On-Waves ehf
Currently the gprs_subscr_update function is called when the
'update-subscriber ... insert ...' command is executed. This will
eventually notify the GMM layer which is rather the purpose of the
'commit' command.
This patch removes the call from update_subscr_insert.
Sponsored-by: On-Waves ehf
There will be an increasing number of SGSN related fields per
subscriber. Instead of extending gsm_subscriber accordingly, a single
struct sgsn_subscriber_data object is assigned to it. The talloc
context used to allocated that object is the subscr object itself.
Therefore it will be freed automatically along with the subscr
object.
Sponsored-by: On-Waves ehf
This adds the following commands to the ENABLE node:
- show subscriber cache
- update-subscriber imsi IMSI insert authorized (0|1)
- update-subscriber imsi IMSI cancel
- update-subscriber imsi IMSI commit
These commands are mainly testing tools and maintenance helpers. The
update commands work asynchronously and can be used to complete a
pending update request or to terminate an existing connection. The
'insert' command just update the subscriber records but does not
notify the GMM layer. Invoke the 'commit' command to continue with
pending procedures.
Note that the subscriber cache is not stored persistently and will
always be empty after an SGSN restart.
Sponsored-by: On-Waves ehf
This function is called to delete an established MM context
silently without invoking a detach procedure.
It is called when a subscriber is cancelled by the HLR. This
generally happens, when an MS has moved to another routing area and
has to use another SGSN.
Sponsored-by: On-Waves ehf
This commit adds a new authorization policy 'remote' and uses
the subscriber cache for authorization when this policy is being used.
Note that there is no remote backend implemented yet. After the
IMSI/IMEI have been acquired, a request would be sent to the remote
peer. The attach/auth-ciph procedure continues when authorization
info has been received from the peer. This means, that
gprs_subscr_update() must be called then to tell the GMM layer
that it can proceed. A later commit will add VTY commands to do this
manually.
Sponsored-by: On-Waves ehf
This patch adds GPRS specific functions for gsm_subscriber objects
(allocation, retrieval, deletion) and subscriber data
requests/updates. The sgsn_update_subscriber_data callback is used to
notify the sgsn about updates and is extended by a parameter that
passes a reference to a gsm_subscriber.
Sponsored-by: On-Waves ehf
Currently the SRES value in the Auth & Ciph Response is ignored.
This patch checks the SRES value in response against the value stored
in mm->auth_triplet.sres. If they don't match, an Auth & Ciph Reject
message is sent to the MS. If they match, the mm->is_authenticated
flag is set.
Note that the procedure will not be started yet.
Sponsored-by: On-Waves ehf
Currently mmctx_timer_start is called from within
gsm48_tx_gmm_auth_ciph_req which differs from the way e.g. the
identification procedure is implemented. It also makes it more
difficult to restart the procedure after timeout, which is not
implemented yet. In addition, the timer is not properly stopped when
an AUTH & CIPH response is received.
This patch removes this timer start from gsm48_tx_gmm_auth_ciph_req,
adds the retransmission of Auth & Ciph requests to the timer callback
function, and properly stops the timer in
gsm48_rx_gmm_auth_ciph_resp.
Sponsored-by: On-Waves ehf
Currently gsm48_tx_gmm_auth_ciph_req/_rej are commented out. In
addition, gsm48_tx_gmm_auth_ciph_req uses a wrong encoding (two byte TV instead of two nibbles TV) of the CKSN information element.
This patch fixes the encoding of the CKSN IE and enables the
functions mentioned above.
Sponsored-by: On-Waves ehf
Currently when the MS does a re-attach without doing a proper detach
first, the gbproxy uses the old local TLLI if patching and the keep
mode are enabled. This leads to a failing attachment procedure when
TLLI patching is also enabled.
This patch changes gbproxy_update_link_state_ul to reset all TLLIs
within the link_info if the message contains an unknown TLLI and an
MI. This is generally the case with Attach Request messages.
The gbproxy_get_link_info_ul gets an additional tlli_is_valid
output parameter that is set, when a TLLI was present and found.
This flag is then used instead of checking tlli.current == 0 to
set TLLI/P-TMSI e.g. Attach Requests when a link_info was already
present for the P-TMSI/IMSI used in such a request.
Ticket: OW#1324
Sponsored-by: On-Waves ehf
Currently the function in sgsn_auth.c either have an sgsn_config or
an sgsn_instance parameter. Since then global sgsn variable is
already being used in that file and since other parts of the SGSN
related code also rely on a global sgsn singleton, these parameters
pretend to provide a flexibility that is not really supported.
Therefore this patch removes these parameters except for the ACL
related functions, which do not call code that uses the sgsn
variable.
Sponsored-by: On-Waves ehf
Currently the authorization is done in sgsn_auth_request for ACL
based authorization. This doesn't match the way remote authorization
would work, so that there is a second call to sgsn_auth_state already
present in sgsn_auth_update.
This patch removes the autorization check completely from
sgsn_auth_request which in turn calls sgsn_auth_update directly now.
Sponsored-by: On-Waves ehf
Currently every time an RA Update Req or an Attach Req is processed, a
new P-TMSI is allocated. When an MS issues another of these messages
before it has completed the first procedure, old_ptmsi is replaced by
ptmsi (and thus lost) and ptmsi is replaced by the newly allocated
P-TMSI. This can confuse the gbproxy, which can loose track of the
logical link then. At least a Blackberry emits a double set of RA Upd
Req messages from time to time which may be just 20ms apart.
This patch adds a check whether mm->ptmsi or mm->old_ptmsi are set.
If both are set, the P-TMSI is not re-allocated. This is only the
case, when the Complete message has not been received yet, since that
message will reset old_ptmsi.
Sponsored-by: On-Waves ehf
Currently when a Detach Accept is received for an unknown TLLI (which
is in general the case afer the SGSN has requested the detachment),
an XID reset is sent to the BSS, causing a BSSGP Status message. This
happens in gsm0408_rcv_gmm.
This patch moves the corresponding call to gprs_llgmm_reset downwards
so that it is not being called in that case.
Addresses:
SGSN->BSS TLLI: 0xd75b91d9 SAPI: LLGMM, UI (DTAP) (GMM) Detach Request
BSS->SGSN TLLI: 0xd75b91d9 SAPI: LLGMM, UI (DTAP) (GMM) Detach Accept
SGSN->BSS TLLI: 0xd75b91d9 SAPI: LLGMM, U, XID (Reset, IOV-UI)
BSS->SGSN TLLI: --- BSSGP STATUS (Unknown MS)
Sponsored-by: On-Waves ehf
Currently, the LLME is not cleaned up after sending an RA Update
Reject. This happens after entering a routing area from outside,
since in that case the SGSN sends an RA Update Reject (implicitly
detached) which causes the MS to restart the attach procedure.
The LLME is also not updated if an Attach Request with message errors
(encoding, invalid MI type) is received or if an MM context cannot be
allocated.
This patch changes gsm48_rx_gmm_ra_upd_req and gsm48_rx_gmm_att_req
to unassign the LLME or free the MM context (if available) after a
Reject message has been sent.
Ticket: OW#1324
Sponsored-by: On-Waves ehf
Currently the VTY 'auth-policy' command results in setting or clearing
the acl_enabled flag. This also enables the matching of the MCC/MNC
prefix of the IMSI.
This patch adds an additional policy 'acl-only' which disables the
MCC/MNC matching and relies on the ACL only.
Sponsored-by: On-Waves ehf
Currently the authorization of an IMSI is done by checking ACLs
synchronously which is not feasible when the subscriber data has to
be retrieved from an external source.
This patch changes this by using a callback when the information is
available. This is also done when only ACL are checked, in this case
the callback is invoked from within sgsn_auth_request(). The callback
function sgsn_update_subscriber_data calls sgsn_auth_update which
in turn calls either gsm0408_gprs_access_granted or
gsm0408_gprs_access_denied. gsm48_gmm_authorize is extended by a call
to sgsn_auth_request when IMSI and IMEI are available but the
auth_state is unknown.
The change has been successfully tested with single phones (E71 and
IPhone 5c).
Sponsored-by: On-Waves ehf
Currently the IMSI is only checked immediately when an Attach Request
is received that contains an IMSI IE. If it contains a P-TMSI
instead, access is always granted.
This commit moves the IMSI check to gsm48_gmm_authorize where it is
applied when IMSI and IMEI have been acquired. This fixes the
authorization when the Attach Accept doesn't contain an IMSI.
Sponsored-by: On-Waves ehf
Currently when forceing a reattach by sending a Detach
Request (reattach), the SGSN waits for the Detach Accept until it
frees the MM context (if present) and the LLME. If that message gets
lost or isn't sent by the MS, the LLME is never freed if it isn't
bound to an MM context.
This patch adds code to free the MM context/LLME when forcing a
reattachment.
Sponsored-by: On-Waves ehf
This patch replaces gsm0408_gprs_force_reattach(msg, mmctx) by two
functions
- gsm0408_gprs_force_reattach(mmctx)
- gsm0408_gprs_force_reattach_oldmsg(msg)
The old function basically consists of the code of the two new
functions, where the code path selected depends on mmctx == NULL,
which is harder to maintain, less obvious to use, and not consistent
with many other SGSN functions.
Sponsored-by: On-Waves ehf
Currently the MM context isn't always removed when it is
de-registered (mmctx_timer_cb), mm_state is set to GMM_DEREGISTERED
instead. This can lead to left-over MM contexts which are only
cleaned up if the MS reattaches.
This patch replaces all of these assignments by a call to
mm_ctx_cleanup_free.
Ticket: OW#1324
Sponsored-by: On-Waves ehf
Currently the GMM state is set to GMM-REGISTERED when an Attach
Accept or a RA Update Accept message is sent, even if a new P-TMSI is
included. In this case 04.08 requires (see 4.7.3.1.3 and 4.7.5.1.3),
that the state is set to GMM-COMMON-PROCEDURE-INITIATED when the
Accept is sent. When the Complete is received, the SGSN shall set
the state to GMM-REGISTERED.
This patch modifies the state updates accordingly.
Sponsored-by: On-Waves ehf
Currently the order of the 'if' clauses in gsm48_gmm_authorize
doesn't match the order in which the conditional parts are entered.
This makes it difficult to maintain. In addition the t3350_mode is
not stored in every path, so that this information is lost when the
identification procedure is started. Since the default value
coincidentally is GMM_T3350_MODE_ATT, this doesn't hurt for Attach
Requests which are the only messages that initially trigger the
authentication yet.
This patch changes the order of the 'if' clause to match the
processing order, it removes the t3350_mode parameter entirely and
introduces a mm->pending_req field. The latter must be set when the
request that causes the authorization before calling
gsm48_gmm_authorize. The gprs_t3350_mode enum is extended by
GMM_T3350_MODE_NONE (value 0, which is the default) to make it
possible to detect related initialisation errors or race conditions.
Sponsored-by: On-Waves ehf
Currently gbproxy_make_sgsn_tlli always returns a foreign TLLI when
it uses the (SGSN) P-TMSI to generate one.
This patch changes the implementation to return a SGSN TLLI of the
same type like the BSS TLLI in that case.
Sponsored-by: On-Waves ehf
Currently the LLME is not deleted when a GMM Status message is
received for which a mmctx cannot be found. This can fill the LLME
list with unneeded entries.
This patch adds code to unassign the LLME in that case.
Ticket: OW#1324
Sponsored-by: On-Waves ehf
The following functions are not being used:
- gsm48_tx_gmm_status_oldmsg
- gsm48_tx_sm_status_oldmsg
This patch removes the function definitions.
Sponsored-by: On-Waves ehf
Currently, when a Detach Request is received with an unknown TLLI,
it is answered by another Detach Request (!), even when a power_off
Type is used.
This patch uses gsm48_rx_gmm_det_req to handle the message instead.
So this function is changed to cope with a NULL mmctx. In that case
it doesn't unassign the llme, so this must be done manually
afterwards.
Sponsored-by: On-Waves ehf
Currently, every time the SGSN received a Detach Request from the MS
via an established logical link, it is answered by a Detach Accept.
This violates the specification (GSM 04.08, 4.7.4.1.2 and .3), which
states, that it should only be sent, if "the detach type IE value
indicates that the detach request has not been sent due to switching
off".
This patch adds a conditional to limit the sending of Detach Accept
accordingly.
Sponsored-by: On-Waves ehf
Currently the ACL code is located in sgsn_vty.c.
This commit moves this to a new file sgsn_auth.c as a first step to
make authorization more flexible in order to implement remote
acquisition on subsciber data.
Sponsored-by: On-Waves ehf
Currently each received Ident Resp triggers an Attach Accept/Reject
if IMSI and IMEI are known. This has led to duplicated Attach Accept
messages when used with the gbproxy (IMSI acquisition active) and
with certain mobile equipment (iOS).
This patch modifies gsm48_rx_gmm_id_resp to discard Ident Resp messages
if all required information (IMEI and IMSI) has been gathered.
Ticket: OW#1322
Sponsored-by: On-Waves ehf
Currently the P-TMSI IE in PAGING_PS is not patched.
This commit adds code to patch BSSGP P-TMSI IE in
gbproxy_patch_bssgp independently from the P-TMSI patching at the LLC
layer. It also extends gbproxy_update_link_state_dl to use the IMSI
to find the link_info if the TLLI is not present in the message.
Note that the spec (GSM 08.18, 7.2) requires to use of the P-TMSI
instead of the IMSI to select the MS if that IE is available.
Nevertheless as long as the IMSI is always present in downlink BSSGP
messages and as long as the optional P-TMSI refers to the same MS
(which is the case currently), this is not an issue.
Sponsored-by: On-Waves ehf
Currently, when P-TMSI patching is enabled, a new BSS P-TMSI is
generated for each Attach Accept. So two duplicated, subsequent
Attach Accept messages will be mapped to different BSS side P-TMSI.
Because the last one will replace former ones in the link_info
struct, the MS will fail to access the SGSN if it uses the former
P-TMSI to derive the new TLLI.
This patch checks the SGSN P-TMSI already assigned to the link_info
and only generates a new BSS P-TMSI on mismatch (or if the BSS P-TMSI
hasn't been set yet).
Ticket: OW#1322
Sponsored-by: On-Waves ehf
The osmo-sgsn sends Status messages (or nothing in case of non
GMM/GSM) when the TLLI is unknown. This prevents the MS from
reconnecting.
This patch adds the initiation of an MT detach procedure to force a
re-attach to set up a valid LLE context if an LLE or an MM context
cannot be found. Since this can also be triggered by non-GMM SAPI
messages, a GPRS application callback sgsn_force_reattach_oldmsg is
added which in turn calls the GMM layer to generate the GSM 04.08
specific messages.
Note that the MS can be left in REGISTERED state after initially
wanting to detach itself, since it will receive a Detach Req
(re-attach) when sending a DEACT PDP CTX REQ after the SGSN or
gbproxy (P-TMSI patching enabled) has been restarted. This same
behaviour has been observed with another SGSN.
Sponsored-by: On-Waves ehf
Currently the PDP contexts are hard freed (via sgsn_pdp_ctx_free)
at some places in gprs_gmm.c on the reception of a Detach Req and on
re-use of an IMSI that is already associated with an MM context. This
can lead to segfaults when there is a pending request or a data
indication at libgtp.
This patch add a new function sgsn_pdp_ctx_terminate that de-associates
the PTP context from the MM context, deactivates SNDCP, sets pdp->mm
to NULL and then calls sgsn_delete_pdp_ctx. sgsn_libgtp is updated to
check for pdp->mm being non-NULL before dereferencing it. The
sgsn_pdp_ctx_terminate function will be called for each PDP context of
an MM context before this context is going to be deleted via
sgsn_mm_ctx_free. To ensure, that the ctx->llme (which is accessed
during the deactivation of SNDCP) remains valid, the call to
gprs_llgmm_assign is moved after the call to sgsn_mm_ctx_free. The
handling of re-used IMSIs is changed to mimic the processing of a
Detach Req.
Addresses:
<0002> gprs_gmm.c:654 MM(/f6b31ab0) Deleting old MM Context for same
IMSI p_tmsi_old=0xc6f19134
<000f> gprs_sgsn.c:259 PDP freeing PDP context that still has a
libgtp handle attached to it, this shouldn't happen!
[...]
SEGFAULT
Ticket: OW#1311
Sponsored-by: On-Waves ehf
Currently the timer is not stopped before the MM context is freed
which can lead to failure if sgsn_mm_ctx_free is called while timer
protected procedures are active.
This patch add code to cancel the timer if necessary from within
sgsn_mm_ctx_free.
Ticket: OW#1322
Sponsored-by: On-Waves ehf
Currently the code segfaults when the link shall be deleted by IMSI
when the IMSI has not been set yet.
This patch adds a NULL check to skip the entry before calling
gsm48_mi_to_string,
Adresses:
Program received signal SIGSEGV, Segmentation fault.
0xb693af77 in gsm48_mi_to_string (string=0xbfffe020 "", str_len=200,
mi=0x0, mi_len=0) at gsm48.c:360
360 mi_type = mi[0] & GSM_MI_TYPE_MASK;
str_len=200, mi=0x0, mi_len=0) at gsm48.c:360
self=0x807c9a0 <delete_gb_link_by_id_cmd>, vty=0xb4303c70,
argc=3, argv=0xbfffe1c0) at gb_proxy_vty.c:670
...
Sponsored-by: On-Waves ehf
Currently all PTP messages are in general forwarded to the SGSN even
when the BVCI is not known to the gbproxy. Only if message patching
is active and the peer cannot be determined, a log message is
generated, a STATUS message returned, and the message discarded.
The intention for this was to keep the old gbproxy's behaviour if
patching is disabled. But the code gets much more complex this way.
Another drawback is that when the SGSN returns a corresponding STATUS
message, it cannot be routed to the BSS where the original message
came from.
This patch therefore changes the behaviour to reject BSSGP PTP uplink
messages immediately if the BVCI is not known.
Fixes: Coverity CID 1244240
Ticket: OW#1317
Sponsored-by: On-Waves ehf
This has been re-produced using the "osmo-pcu emulator" code
and a ping to force segmented SNDCP messages. When the NS link
enters the DEAD/BLOCKED state the msgb would be freed twice.
Once inside gprs_ns_sendmsg and once by the caller. Based on the
return one can not see if the parameter has been deleted.
I changed libosmocore/libosmogb to always free the msgb in case
of an error on the way to gprs_ns_sendmsg. Catch up, avoid the
double free and fix some memory leaks. In case the sending fails
assume the entire segmented message is at end and free the
original input data.
This has been tested by posix suspending/resuming the emulator
process to have the GPRS-NS link go to dead/blocked to alive
and unblocked. The ping recovers and "SIGUSR1" to the SGSN does
not show active memory allocations.
The SGSN calls bssgp_tx_dl_ud at the lowest level and has the
following callchains. Most of them allocate the msgb and have
no early return and transfer ownership already:
<- gprs_llc_tx_u
<- gprs_llc_tx_ui
<- gsm48_gmm_sendmsg (all callers sane)
<- _tx_status
<- _tx_detach_req
<- gprs_llc_tx_xid (all callers sane)
<- sndcp_unitdata_req
<- sndcp_send_ud_frag
To get a clue which message caused the error without having to enable
LOGL_DEBUG, information about how far the parser came (message name,
parsed fields) is logged with LOGL_NOTICE along with a full hexdump
of the message.
Ticket: OW#1307
Sponsored-by: On-Waves ehf
Currently, the log level is always LOGL_DEBUG. In case of errors it
would be helpful to use a higher log level.
This patch adds a log_level parameter to gprs_gb_log_parse_context to
let the caller decide about the level.
Ticket: OW#1307
Sponsored-by: On-Waves ehf
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
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
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
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
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
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
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
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
This commit adds/modifies the following VTY commands:
- delete-gbproxy-tlli <NSEI> de-registered : Delete all
de-registered entries
- show gbproxy tllis : Display 'DE-REGISTERED' when appropriate
In addition, the implementation of the delete-gbproxy-tlli command
has been split into two functions (with and without TLLI/IMSI
value).
Sponsored-by: On-Waves ehf
gprs_gb_log_parse_context() uses a sequence of LOGP calls to compose
a single message line. This leads to cluttered log output.
This patch replaces all but the first LOGP applications in this
function by applications of LOGPC.
Sponsored-by: On-Waves ehf
Currently it is possible to create several tlli_info entries with the
same IMSI.
This patch disables this by adding a check before the imsi field
is updated.
Sponsored-by: On-Waves ehf
Currently a tlli_info entry is deleted when the TLLI gets invalidated
by a Detach message.
This patch introduces the possibility to keep tlli_info entries in
the list. Those entries then have cleared TLLI fields, are marked as
de-registered, and can only be retrieved by a message containing an
IMSI or a P-TMSI.
The following VTY configuration commands are added to the gbproxy
node:
- tlli-list keep-mode never : Don't keep the entries (default)
- tlli-list keep-mode re-attach : Only keep them, when a Detach
message with re-attach required has been received
- tlli-list keep-mode identified : Only keep entries which are
associated with an IMSI
- tlli-list keep-mode always : Keep all entries
Note that at least one of max-length or max-age should be set when
this feature is used to limit the number of entries.
Sponsored-by: On-Waves ehf
Currently when patching is basically enabled P-TMSI and TLLI gets
patched even when P-TMSI patching is not enabled. Albeit the result
is correct in this case (the same value is re-written), the counter
shows unexpected results.
This patch adds configuration checks for P-TMSI and TLLI patching. It
also reorders the code of gbproxy_patch_raid to return early if there
is nothing to patch.
Sponsored-by: On-Waves ehf
This function is a remainder of the initial implemenation that was
not meant for TLLI patching and can be used for the BSS side only.
The SGSN side is already using a composition of more flexible
single purpose functions.
This patch changes the implementation to use a similar approach. The
function is moved to gbproxy_test.c and renamed to register_tlli to
keep the tests intact.
Sponsored-by: On-Waves ehf
If IMSI acquisition is enabled and the gbproxy receives a Detach
request from the MS, it cannot pass it to the SGSN since the
acquisition has not yet been completed.
This patch implements the generation of a Detach Accept message and
for this case and updates the TLLI state accordingly.
Sponsored-by: On-Waves ehf
Currently the RAI in the LLC part of the message is not updated if
the message has been taken from the list of stored messages. The
reason is, that old_raid_matches is update in
gbprox_process_bssgp_ul() but not in gbproxy_flush_stored_messages().
This patch moves the check to gprs_gb_parse_bssgp() which is called
at both places and where other fields like parse_ctx->tlli are set,
too.
In addition, old_raid_matches is replaced by old_raid_is_foreign
since this is clearer in the case when there is no old RAI at all.
Several RAI patch counter assertions are also added to
test_gbproxy_ra_patching().
Sponsored-by: On-Waves ehf
Since at all places where mi_data/mi_data_len is used it will always
contain an IMSI. Thus the names of the identifiers have been updated
accordingly for clarity.
Sponsored-by: On-Waves ehf
This commit changes gbproxy_imsi_acquisition as follows:
tlli_info->mi_data_len is used instead of parse_ctx->imsi to check,
whether the IMSI is known already. Since the function is always
called after gbproxy_update_tlli_ul(), the two values are already
synchronized.
Messages are always flushed when the IMSI gets known, if the current
message is IDENT RESP discard it, otherwise continue processing as
usual.
The 'if' clauses are simplified for better readability.
Sponsored-by: On-Waves ehf
gbprox_process_bssgp_ul has grown quite large mainly by the addition
of IMSI acquisition.
This patch moves that code into several smaller functions. In
addition, the peer resolution which is similar to that in
gbprox_process_bssgp_dl is moved into a separate function, too.
Sponsored-by: On-Waves ehf
This patch removes the patch_mode feature including the related VTY
command patch-mode. Where sensible, the other configuration flags are
queried instead.
In addition, this initial checks in gbprox_process_bssgp_dl() and
gbprox_process_bssgp_ul() have been updated.
The patch mode feature has not been used and was increasingly
difficult to maintain.
Sponsored-by: On-Waves ehf
Currently the stored messages are only removed, when IMSI acquisition
has succeeded. In addition, receiving two ATTACH_REQ messages in
sequence (e.g. due to loss of a Identity Req/Resp message) will not
restart the IMSI acquisition procedure.
This patch adds gbproxy_tlli_info_discard_messages() to clean up the
message list and calls it from gbproxy_delete_tlli() fixing a
potential memory leak. It is also called when an Attach Request
message has been received. In that case the imsi_acq_pending flag is
cleared, too. This would (re-)trigger the IMSI acquisition procedure
at each of these messages. If an Ident Response has been lost,
resending the Ident Request with the same N(U) will not work.
Therefore the N(U) gets incremented on each Ident Request generated
by the gbproxy. The first N(U) used is 256 which shouldn't collide
with the V(UT) used by the SGSN given that P-TMSI patching is enabled
(since a new random TLLI is used initially on every new (no
tlli_info) connection and V(U) starts with zero then).
Ticket: OW#1261
Sponsored-by: On-Waves ehf
Currently, a new P-TMSI within an Attach Accept or within an RA
Update Request is applied to the TLLI mapping (gbproxy_reassign_tlli)
_before_ patching is done. This can lead to inconsistent behaviour
when the TLLI validation has not been completed, which is the case
when subsequent RA UDP REQ are received. The new TLLI must not be
applied to the message itself yet, it should only be considered for
following messages.
This patch moves the TLLI reassignment to
gbproxy_update_tlli_state_after() to fix that.
It also separates the implementation of the feature that a new
tlli_info can be created when such a message is received from the
SGSN. This makes sense, when P-TMSI patching is not active and the
tlli_info entry has expired.
Sponsored-by: On-Waves ehf
Currently tlli_info are created for SGSN originated messages when
the SGSN TLLI cannot be found and P-TMSI patching is active. This
doesn't make much sense, since the BSS side TLLI is not known in this
case. Given that the SGSN is working properly, that can only happen
if either the tlli_info has expired or the gbproxy has been
restarted.
This patch disables the creation of a tlli_info in this case.
Note that these messages are passed unmodified to the MS so far.
Sponsored-by: On-Waves ehf
Since the secondary SGSN selection and APN patching can both be
enable/disabled by IMSI matching, this patch introduces a separate
match-imsi command and removes the corresponding variant of the
core-access-point-name command.
P-TMSI patching and IMSI acquisition are enabled/disabled by
match-imsi resp. secondary-sgsn. The patch-ptmsi and acquire-imsi
commands are still available for internal testing but are subject to
being removed.
Sponsored-by: On-Waves ehf
This patch extends the 'show gbproxy tllis' command to display the
number of stored messages per tlli_info if there are any.
Sponsored-by: On-Waves ehf
Currently all STATUS messages coming from the SGSN are just logged
and dropped. This prevents the PCU from recognising that the
(secondary) SGSN doesn't know about a certain BVCI and might require
a reset procedure.
This patch changes gbprox_rx_sig_from_bss() to forward STATUS
messages with cause "Invalid BVCI" containing a BVCI to the BSS.
Note that this will not forward broken "Invalid BVCI"
messages which do not include a BVCI IE.
Sponsored-by: On-Waves ehf
Currently the gbproxy sends STATUS messages that are not compliant to
GSM 08.18, 10.4.14.1: The BVCI must be included if (and only if) the
cause is either "BVCI blocked" or "BVCI unknown".
This patch adds a missing BVCI to UNKNOWN_BVCI and BVCI_BLOCKED
status messages if the BVCI is available. Otherwise, INV_MAND_INF is
used instead.
Sponsored-by: On-Waves ehf
Currently the numeric TLLI or tlli_info's enable_patching flag is
used to decide, whether a APN shall be patched or the secondary SGSN
shall be used. Using the numeric TLLI imposes a problem, when
TLLI/P-TMSI patching is used, since gbproxy_check_tlli uses the BSS
side TLLI namespace when trying to get the tlli_info.
This patch modifies the gbproxy_check_tlli() function to accept a
tlli_info pointer instead of a numeric TLLI. The tlli_info is already
available when the function is called. Since this a similar approach
has been used by accessing the enable_patching flag directly, this
commit unifies checking by always using this function instead of the
flag outside of gb_proxy_tlli.c.
This fixes the APN patching that doesn't work currently when P-TMSI
patching is enabled.
Sponsored-by: On-Waves ehf
Currently the new command acquire-imsi and secondary-sgsn are not
included into the write command's output.
This is fixed by this commit.
Sponsored-by: On-Waves ehf
Some messages that are related to the BVC itself must be forwarded to
the secondary SGSN, too.
This patch implements this for BVC-RESET (BVCI != 0) and FLOW-CONTROL-BVC
messages. The resulting acknowledgement messages from the secondary
SGSN are silently dropped. The idea behind this is that the primary
SGSN is responsible for setting up and maintaining the BVC whereas
the secondary SGSN is rather passive and just has to accept it.
Ticket: OW#1258
Sponsored-by: On-Waves ehf
This patch modifies gbprox_process_bssgp_ul() to send the message to
the secondary SGSN if the IMSI has matched and routing to the
secondary SGSN is enabled. The destination for stored messages is
modified accordingly.
Ticket: OW#1261
Sponsored-by: On-Waves ehf
This patch refactors SGSN NSEI handling to support a secondary SGSN.
It adds the following VTY commands:
- secondary-sgsn nsei <0-65534>
- no secondary-sgsn
Sending messages to the secondary SGSN is not yet implemented, but
received messages from such a SGSN would be forwarded to the BSS
peers.
Sponsored-by: On-Waves ehf
This should have been part of the 'Implement IMSI acquisition'
commit, where a similar change has been made for BSS originated PTP
messages.
Sponsored-by: On-Waves ehf
To modify or route messages based on the IMSI the latter must be known
when the action shall take place.
This patch modifies the gbproxy to optionally retain and enqueue
messages from the MS while initiating an identification procedure.
Further message processing of the LLC PTP link towards the SGSN will
be done, when the identity of the MS has been acquired.
Note that the N(U) of the LLC GMM SAPI are not adjusted, so it is
possible that adjacent messages of a single LLC link arriving either
at the BSS or the SGSN have the same N(U) and might get discarded,
leading to retransmissions and additional delay.
Note also that retransmissions and packet loss are not yet handled
explicitely. If for instance the generated IDENT REQ gets lost, the
gbproxy will not act on its own. In this case, the MS will time out
and eventually resend the Attach Request on which the gbproxy will
act exactly like before (thus having two Attach Req messages in its
queue, which will both be sent after the Ident Resp arrives).
This has been tested successfully with an E71, needing one
retransmission by the SGSN due to an N(U) collision.
Ticket: OW#1261
Sponsored-by: On-Waves ehf
Currently when patching is enabled and an error happens when
receiving a message from the SGSN, the patched message is sent back
with the PDU_IN_ERROR IE.
This patch modifies gbprox_rx_sig_from_sgsn() to copy the message
before it is patched, so that the original message can be used with
the STATUS message. gbprox_rx_ptp_from_sgsn() does all checks before
the message is patched, so copying is not necessary.
Since gbprox_rx_sig_from_sgsn() is not called for BSSGP UNITDATA
messages and the msgb is already been copied in the gbprox_relay2peer
function, the relative performance impact is expected to be low.
Note that the PDU IE of STATUS messages received from an MS and
forwarded to the SGSN will not be patched. STATUS messages from the
SGSN are only logged and not forwarded to the MS.
Sponsored-by: On-Waves ehf
This patch adds gbprox_rx_data_from_sgsn() and
gbprox_rx_ptp_from_bss() which contain the PTP message processing
of gbprox_rcvmsg(). The calls to gbprox_process_bssgp_ul() are moved
from gbprox_relay2sgsn() to gbprox_rx_ptp_from_bss() and
gbprox_rx_sig_from_bss().
The goal is, to do all patching (and calls to gbprox_process_bssgp_*)
from within the gbprox_rx_* functions. Doing the patching from within
gbprox_relay2sgsn has the drawback, that the patching code cannot
call gbprox_relay2sgsn() which is needed if a single message shall
trigger a sequence of messages.
Sponsored-by: On-Waves ehf
gbproxy_patch_bssgp: Move a check for tlli_info in front of the first
conditional that depends on it, and return immediately if it is NULL.
gbproxy_register_tlli: Initialize tlli_already_known to 0.
Fixes: Coverity CID 1232691
Fixes: Coverity CID 1232692
Sponsored-by: On-Waves ehf
The gb_proxy shouldn't start to open the box of pandora by including the
gsm_data_shared.h file, particularly not without defining the BSC role.
In any case, as the reserved TMSI is something that's part of the GSM
specs, and not specific to the OpenBSC implementation, it should be part
of libosmocore.
This patch moves the peer related definitions from gb_proxy.c to
gb_proxy_peer.c and adjusts the prefix of each global symbol to
gbproxy_:
Peer definitions (prefix adjusted to gbproxy_):
peer_ctr_description -> gprs/gb_proxy_peer.c (static)
peer_ctrg_desc -> gprs/gb_proxy_peer.c (static)
*peer_by_* -> gprs/gb_proxy_peer.c
gbproxy_peer_alloc -> gprs/gb_proxy_peer.c
gbproxy_peer_free -> gprs/gb_proxy_peer.c
gbprox_cleanup_peers -> gprs/gb_proxy_peer.c
Sponsored-by: On-Waves ehf
This patch moves several functions and declarations out of gb_proxy.c
to make them reusable by other components and to separate them by
context and task.
Counter enums (prefix is changed to gbproxy_):
enum gbprox_global_ctr -> gprs/gb_proxy.h
enum gbprox_peer_ctr -> gprs/gb_proxy.h
Generic Gb parsing (prefix is changed to gprs_gb_):
struct gbproxy_parse_context -> openbsc/gprs_gb_parse.h
gbprox_parse_dtap() -> gprs/gprs_gb_parse.c
gbprox_parse_llc() -> gprs/gprs_gb_parse.c
gbprox_parse_bssgp() -> gprs/gprs_gb_parse.c
gbprox_log_parse_context() -> gprs/gprs_gb_parse.c
*_shift(), *_match() -> gprs/gprs_gb_parse.c (no prefix)
gbprox_parse_gmm_* -> gprs/gprs_gb_parse.c (static)
gbprox_parse_gsm_* -> gprs/gprs_gb_parse.c (static)
MI testing/parsing (prefix gprs_ added):
is_mi_tmsi() -> gprs/gprs_utils.c
is_mi_imsi() -> gprs/gprs_utils.c
parse_mi_tmsi() -> gprs/gprs_utils.c
TLLI state handling (prefix is changed to gbproxy_):
gbprox_*tlli* -> gprs/gb_proxy_tlli.c
(except gbprox_patch_tlli, gbproxy_make_sgsn_tlli)
Message patching (prefix is changed to gbproxy_):
gbprox_*patch* -> gprs/gb_proxy_patch.c
gbprox_check_imsi -> gprs/gb_proxy_patch.c
Sponsored-by: On-Waves ehf
This patch modifies gbprox_make_bss_ptmsi() to generate a new P-TMSI
when patch_ptmsi is set in the configuration instead of using the
P-TMSI assigned by the SGSN. It modifies gbprox_make_sgsn_tlli() to
either use a foreign TLLI based on the SGSN side P-TMSI or (if there
is none) generate a random TLLI if patch_ptmsi is set. Otherwise, the
TLLI used by the BSS is used.
The seeds for the pseudo-random sequences sre set based on time
initially. Note that these are neither cryptographically safe nor
protected against collisions.
Ticket: OW#1259
Sponsored-by: On-Waves ehf
This patch contains fixes for the TLLI tracking and handling.
It adds and uses gbprox_map_tlli() the map the source TLLI to the
destination TLLI while respecting whether it is current or assigned.
It removes gbprox_register_tlli() from the downlink path. It fixes
TLLI validation and disables the use of the BSSGP TLLI IE.
Sponsored-by: On-Waves ehf
Currently, these messages lead to a parsing error which prevents them
from being processed any further.
This patch sets the return value of gbprox_parse_llc to 1 in these
cases and fixes a segfault which is triggered by any non-04.08
message.
Sponsored-by: On-Waves ehf
Currently gbprox_patch_raid() updates the local MCC/MNC with every
BSS originated message, even if the RAI is an 'old' one.
This patch separates state updating and patching into 2 functions
gbprox_update_current_raid and gbprox_patch_raid. In addition, a
field named old_raid_enc is added to gbproxy_parse_context, which is
used for 'old RAI' IEs in Attach Requests and RA Update Requests.
Only the bssg_raid_enc in BSS originated message is used to update
the BSS side 'local' MCC/MNC.
Sponsored-by: On-Waves ehf
This patch splits the functionality of gbprox_get_detached_tlli_info
into 2 new functions:
- gbprox_tlli_info_alloc to allocate an intialized and detached
tlli_info
- gbprox_detach_tlli_info to detach an already attached tlli_info
Sponsored-by: On-Waves ehf
This VTY command add the following commands to the gbproxy node:
- patch-ptmsi: Enables P-TMSI/TLLI patching
- no patch-ptmsi: Disables P-TMSI/TLLI patching
Note that using these commands interactively can load to undefined
behavior of existing LLC connections.
Sponsored-by: On-Waves ehf
This patch separates BSS side from SGSN side TLLI/PTMSI tracking. When
TLLI/PTMSI patching is not enabled, the corresponding states shall be
identical. The TLLI/PTMSI state has been moved into the struct
gbproxy_tlli_state and is used twice in gbproxy_tlli_info.
Since the state handling for uplink and downlink messages is
diverging, gbprox_update_state() is replaced by two functions
gbprox_update_state_dl/gbprox_update_state_ul and
gbprox_process_bssgp_message() is replaced by
gbprox_process_bssgp_dl/gbprox_process_bssgp_ul.
Sponsored-by: On-Waves ehf
Don't replace the current TLLI immediately, store it in an additional
'assigned_tlli' field and discard the old TLLI when both sides have
used the new one (see GSM 04.08, 4.7.1.5).
Add an Attach Complete message to test and check, whether the related
field of the corresponding tlli_info struct are set as expected
during the local TLLI validation cycle.
Sponsored-by: On-Waves ehf
Currently the enable_patching field in tlli_info is not updated,
when an IMSI is assigned to a TLLI that is already known.
This patch fixes this in gbprox_update_state() after the call to
gbprox_update_tlli_info().
The number of APN increases and the test output file is updated
accordingly.
Sponsored-by: On-Waves ehf
GSM 24.008 also allows a P-TMSI field in Detach request messages.
This patch adds gbprox_parse_gmm_detach_req() to parse Detach Request
messages which sets the ptmsi field if the IE is present.
In addition, when power_off is set to 1 (MO only), the
invalidate_tlli field is set, since Detach Request message is
expected in this case.
The second detach test (see 'RA update') is modified to use
power_off instead of relying on a Detach Accept from the network.
To make this work, the PTMSI of the RA Update Accept is fixed to
match the TLLI of the Detach Request.
Sponsored-by: On-Waves ehf
Add a separate function to clear the IMSI filter to be used instead of
gbprox_set_patch_filter(cfg, NULL, ...). Albeit it fixes a Coverity
issue (Unchecked return value), it is a false positive, since the
return value is always 0 in these cases. Nevertheless it is more
obvious what happens when an explicit clear function is called. Using
NULL as filter argument of gbprox_set_patch_filter still clears the
filter.
Fixes: Coverity CID 1231255
Sponsored-by: On-Waves ehf
Now that the bulk of the control interface node lookup has
no reference to the BSC specific data structures, we are
moving it into libosmocore.
A control interface user now only registers an optional small
node lookup function like bsc_ctrl_node_lookup()
This patch modifies the code to pass a pointer to the tlli_info
around once it has been acquired. To achieve this,
gbprox_register_tlli() and gbprox_update_state() are modified to
return it (if it has been found or created), and gbprox_patch_llc(),
gbprox_patch_bssgp(), and gbprox_update_state_after() are modified to
take it as parameter.
Add a new function gbprox_touch_tlli() to update timestamp and list
ordering for existing tlli_infos.
The motivation behind this patch is to make the tlli_info available to
the patching code and to avoid repeated searches for the same TLLI.
Sponsored-by: On-Waves ehf
The current implementation of this function is O(N), where N is the
number of entries.
The new implementation is O(D), where D is the number of entries that
are going to be deleted.
Sponsored-by: On-Waves ehf
Currently time() is called at several places to control TLLI aging.
Beside calling time() more often than necessary, the decision which
timesource is to be used is coded into the TLLI handling, and testing
complex aging scenarios is cumbersome.
This patch passes the current time as a parameter instead. The call
to time() is moved to gbprox_process_bssgp_message().
Sponsored-by: On-Waves ehf
This patches removes the call to gbprox_remove_stale_tllis()
from gbprox_register_tlli(), so it must be called explicitly now.
The call is now done from within gbprox_update_state_after().
In addition, the TLLI cache size counter is also kept in sync when
gbprox_remove_stale_tllis is called manually. The call to
gbproxy_peer_free() in gbproxy_peer_free() is moved behind the TLLI
to allow for counter updates in gbprox_delete_tlli().
Sponsored-by: On-Waves ehf
This patch refactors that function by separating the actual patch
code into a new function gbproxy_patch_bssgp(), similar to
gbproxy_patch_llc(). The remaining function is renamed to
gbproxy_process_bssgp_message. The existing function
gbproxy_parse_bssgp_message() is renamed to
gbproxy_process_bssgp_message to match gbproxy_parse_llc.
Sponsored-by: On-Waves ehf
This adds a test for gbprox_set_patch_filter() and
gbprox_check_imsi().
It also fixes the masking of the type field when IMSIs are checked by
using GSM_MI_TYPE_MASK (0x07) instead of 0x0f.
Sponsored-by: On-Waves ehf
Currently only TLLIs for which it is known that they may be patched
are put into the TLLI list.
This patch changes this to add TLLIs even when the IMSI is not yet
known. A enable_patching flag is added to the gbproxy_tlli_info
structure to control patching.
Note that this puts every active TLLI into the list where accesses
are O(N) currently.
Sponsored-by: On-Waves ehf
This adds parsing support for the following messages:
- Attach Request: IMSI/PTMSI
- Identity Response: IMSI/PTMSI
- BSSGP: Optional TLLI IE
- BSSGP/PAGING_PS: PTMSI
A new new_ptmsi_enc field is added for newly assigned PTMSI in
SGSN->BSS messages (instead of ptmsi_enc). The ptmsi_enc field is now
used for informational PTMSI IE in messages.
Sponsored-by: On-Waves ehf
This adds a gbprox_parse_bssgp_message() function that contains the
parsing part of the former gbprox_patch_bssgp_message(). This
includes a call to gbprox_parse_llc().
The calls to gbprox_patch_llc(), gbprox_update_state() and
gbprox_update_state_after() have therefore been moved to
gbprox_patch_bssgp_message().
Sponsored-by: On-Waves ehf
This patch unifies the TLLI tracking for all LLC messages. The TLLI
state handling is moved into separate functions.
Only Detach Accept messages are taken into account to release a TLLI,
which is safe but not optimal.
Sponsored-by: On-Waves ehf
Currently, parsing and optionally patching is done in the same
functions (e.g. gbprox_patch_gmm_attach_req()).
This patch moves the patching code out of these functions into
gbprox_patch_llc() and just stores pointers to the relevant data
areas into parse_ctx. Consequently the len_change parameter is
removed and the _patch_ in the function's names is renamed to
_parse_. In addition, the patching_is_enabled checks and counter
increments are moved out of these functions, too.
Sponsored-by: On-Waves ehf
Some broken equipment does not convert the P-TMSI to a Local TLLI.
This leads to the SGSN ignoring the GPRS Attach Complete message
from the phone. Proprietary SGSNs and some documentation we found
state that one should always set the two highest bits of a P-TMSI
to one. This will help broken equipment and will avoid a potential
P-TMSI/TLLI clash. The P-TMSI/Local TLLI mapping is now bijective.
Currently gbprox_register_tlli() is a rather complex function.
This patch splits it into several smaller functions to ease reviewing
and maintaining it.
Sponsored-by: On-Waves ehf
This adds a unit test for gbprox_register_tlli() and
gbprox_remove_stale_tllis().
The dump_peers() function is extended by a cfg parameter to support
a non-global gbproxy_config.
Done with Jacob
This comparison bit-ored the TLLI with 0xc000 instead of 0xc000000.
Since this has never worked properly yet and since normalizing to
local TLLIs doesn't seem sensible here, the comparison is removed
entirely.
Sponsored-by: On-Waves ehf
In these functions we assume that peer is not NULL. Add a compiler
attribute in the hope that either coverity or GCC/Clang will help
us to find a misusage.
Done with Jacob
Global state prevents us from writing simple units tests for
single routines. Go through the code and add pointers to the
gbproxy configuration. Only the vty and the test code remain
using the global gbproxy instance.
Create a testcase for the gprs_str_to_apn and gprs_apn_to_str
routines. While writing the testcase we noticed it is possible to
write more bytes than should have been allowed. This is fixed by
checking that the max_len is at least 1 (needed to write the first
length octet) and to do the size check before writing to the output.
Modify the signature of gprs_str_to_apn to put the length/size next
to the parameter that requires a size.
Done with Jacob
We intend to move some of these routines to libosmocore but to avoid
a feature symbol clash we are prefixing these routines with gprs_.
Done with Jacob
The application is called gbproxy but the structures and functions
were inconsistently named as either gbprox or gbproxy. Rename all
structures to use gbproxy.
Done with Jacob
Holger Hans Peter Freyther
Daniel Willmann
Harald Welte