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
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
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 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 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
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.
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
Move the global data into the struct and use it. gbprox_reset will
first free data and then re-initialize the structure. This code is
used by the unit test.
Done with Jacob
These commands manage the TLLI list used to decide whether an APN
shall be patched or not. Note that this list is (currently) only
maintained if IMSI matching is used.
VTY commands (enable node):
show gbproxy tllis show all TLLI entries
delete-gbproxy-tlli NSEI stale purge all stale entries
delete-gbproxy-tlli NSEI imsi IMSI purge entry with the IMSI given
delete-gbproxy-tlli NSEI tlli TLLI purge entry with the TLLI given
Sponsored-by: On-Waves ehf
This patch adds IMSI/TLLI connection tracking and uses it to control
APN patching based on the IMSI. TLLI entries can expire based on age
and/or by limiting the TLLI list size.
VTY config-gbproxy:
no core-access-point-name disable APN patching
core-access-point-name none remove APN if present
core-access-point-name APN replace APN if present
core-access-point-name none match-imsi RE remove if IMSI matches
core-access-point-name APN match-imsi RE replace if IMSI matches
tlli-list max-age SECONDS expire after SECONDS
no tlli-list max-age don't expire by age
tlli-list max-length N keep N entries only
no tlli-list max-length don't limit list length
RE is an extended regular expression, e.g. ^12345|^23456
Ticket: OW#1192
Sponsored-by: On-Waves ehf
Patch the APN in every 'Activate PDP Context Request' message to the
value given by the 'core-access-point-name' command. If the command is
given without an APN, the whole APN IE will be removed. If the
command is being prefixed by a 'no', the APN IE remains unmodified.
The patch mode 'llc-gsm' is added to selectively enable the patching
of LLC session management messages. This is enabled implicitely by
the patch mode 'llc'.
Note that the patch mode should not be set to a value not enabling
the patching of LLC GSM messages ('llc-gsm', 'llc', and 'default' are
sufficient to patch 'Activate PDP Context Request' messages).
Ticket: OW#1192
Sponsored-by: On-Waves ehf
This patch extends the BSSGP patch code to also patch LLC information
elements along with MCC/MNC patching support for the following messages:
- Attach Request
- Attach Accept
- Routing Area Update Request
- Routing Area Update Accept
- P-TMSI reallocation command
Note that encrypted packets will not be patched.
Ticket: OW#1185
Sponsored-by: On-Waves ehf
This adds a feature to patch the BSSGP MNC/MCC fields of messages going
to and coming from the SGSN. To enable this feature, the gbproxy's
VTY commands 'core-mobile-country-code' and/or
'core-mobile-network-code' must be used. All packets to the SGSN are
patched to match the configured values. Packets received from the
SGSN are patched to the corresponding values as last seen from the BSS
side.
Note that this will probably not work with a gbproxy used for several
BSS simultaneously.
Note also, that MCC/MNC contained in a LLC IE will not be patched.
Ticket: OW#1185
Sponsored-by: On-Waves ehf
This parameter is not used (the methods are always called with an
argument of 1 in the third position). Thus the parameter is removed
completely.
Sponsored-by: On-Waves ehf
This checks the behavior of the gbproxy when the BSS peer changes the
NSEI and the NSVCI. It also tests BVC_RESET and other UNITDATA
messages after these changes between BSS and SGSN and vice versa (via
the gbproxy).
Ticket: OW#874
Sponsored-by: On-Waves ehf
This adds the option to delete all BVC peers and/or NS_VC with a
given NSEI with a single command. Static (configured) NS-VC are not
affected. In addition, all connections for this NSEI that can be
deleted by this command can be listed without deleting them by
appending 'dry-run' to the command.
Sponsored-by: On-Waves ehf
This adds a test with a UNITDATA SGSN message that is addressed to an
invalid (unknown) BVCI. The test shows, that the message is echoed to
the SGSN.
Sponsored-by: On-Waves ehf
This adds counters that are incremented when errors are detected.
It also modifies the VTY command 'show gbproxy' so that
'show gbproxy stats' shows the counters.
Sponsored-by: On-Waves ehf
Currently in most places in gb_proxy.c a reference to a NS-VC object
is used where the peer is meant instead. The patch changes this by
using the NSEI instead in these cases.
Sponsored-by: On-Waves ehf
This program tests the gbproxy implementation by passing NS messages
to a modified gbproxy that dumps the resulting messages, signals, and
state.
It focusses on testing abnormal situations like port changes.
Ticket: OW#874
Sponsored-by: On-Waves ehf
libosmogsm is a new library that is distributed in the libosmocore.
Now, openbsc depends on it. This patch gets openbsc with this
change.
This patch also rewrites all include path to the new
osmocom/[gsm|core]
Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
Almost all parameters about the SGSNs NS-VC can be specified in the NS
protocol node. All that needs to remain in the gbproxy config node
is "nsip sgsn nsei XXX".
Some BSS that connect to the proxy do not continue to perform the
RESET procedure after a timeout. In order to resurrect them, we
simply start a RESET procedure.
Jacob Erlbeck
Harald Welte