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This commit adds code to parse the PTMSI in network originated
messages
- Attach Accept,
- Routing Area Update Accept, and
- P-TMSI Reallocation Command (see below)
to keep track of the TLLI identifying the LLC connection.
The P_TMSI Realloc Command specific code is not being tested yet, so
a corresponding notice is logged when such a message will be
received.
NOTE:
The gbproxy will lose the TLLI when the MS doesn't receive/use
the message (normally the SGSN remembers the old TLLI for some time
to avoid this kind of problem). If this happens the MS will
probably restart the procedure and the network will have to answer
again eventually using one of the above messages which will
re-associate the IMSI with the TLLI before the MS can send a
PDP Context Request message.
Ticket: OW#1192
Sponsored-by: On-Waves ehf
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This adds a set of function that parse a single tlv, lv, tv, or v
encoded information element. They are complementary to the *_put
functions defined in libosmocore's tlv.h file. The functions update
the data and data_len fields unless they are a 'match' function and
the tag field doesn't match.
Sponsored-by: On-Waves ehf
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Currently the enabled_tllis_count field isn't always decremented when
an element is removed from the TLLI cache list.
This patch adds the missing update and also adjusts the counter
accordingly.
Sponsored-by: On-Waves ehf
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Add TLLI cache output to gbprox_dump_peers() to include this info
into the test output.
Separate RA Update Req message handling from Attach Request handling.
Note: There is no test case for the P-TMSI Reallocation Command yet.
Sponsored-by: On-Waves ehf
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This commit adds the following counters:
- attach-reqs: Number of Attach Request messages
- attach-rejs: Number of Attach Reject messages
- tlli-cache: Size of the TLLI cache
Sponsored-by: On-Waves ehf
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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
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Currently, all patching state is stored globally in the gbproxy. Thus
the feature cannot be used safely with a concentrating gbproxy (NAT).
This patch moves the state and relevant counters to the gbprox_peer
structure. It adds code to resolve the corresponding peer when
packets are received by looking at BVCI, NSEI, and BSSGP IEs (BVCI,
RAI/LAI/LAC) when the peer is not passed to the
gbprox_patch_bssgp_message() function.
Test cases are also added for the SGSN->BSS case including test cases
with invalid identifiers.
Note that this patch should make it possible to use RAI patching at a
NAT gbproxy as long as the messages are not encrypted.
Ticket: OW#1185
Sponsored-by: On-Waves ehf
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This patch adds a Detach Request (MO) / Detach Accept sequence to the
test, followed by another (here invalid) Act PDP Context Req which
should be APN patched.
Sponsored-by: On-Waves ehf
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Add a DTAP GMM Information message with an IMSI in the BSSGP header
to enable the association between IMSI and TLLI.
The TLLI of the Routing Area Update messages is set to foreign.
Sponsored-by: On-Waves ehf
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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
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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
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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
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This patch makes a few changes to improve readability:
- change the sendto() hexdump to start with NS instead of BSSGP
- use more specific message descriptions instead of 'UNITDATA'
- add a title line per test
Sponsored-by: On-Waves ehf
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Jacob pointed out that "free_endp" refers to the memory of
the endpoint being freed. What we want is actually a way to
release an endpoint (and the resource it allocated) or in
the case of the testcase/testapp initialize the data structure
correctly. Introduce two names for that.
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In case the sender didn't send a couple of frames we will have
a time gap that is bigger than the accepted delta. Add a new
testcase for this and update the next_time.
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Transcoding from GSM to PCMA can lead to the MGCP MGW sending
two PCMA packages with the same sequence number and timestamp.
Once with the encoded audio and once completely empty.
This is because "state->dst_packet_duration" is 0 in most cases
(unless a ptime is forced) and we attempt to encode audio even
if there are not enough samples. The encode_audio return will
return 0 in that case which is not trated as an error by the
mgcp network code.
Handle rc == 0 specially and document the semantic.
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The sequence number was read from the wrong place and then
the wrong byte order conversion routine was used so we ended
up wirting 0x00, 0x00 into the patched sequence number. Add
a testcase for that.
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It took me a long time to figure out that errx just exits and
the test output didn't indicate that the application was exited
early. Use a printf and good old abort in case of a failure.
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Separate the test from the code necessary for the setup. This is
somehow inspired by the PhExample framework of Pharo.
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Enable the generation of more log messages.
Sponsored-by: On-Waves ehf
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An empty log_info is not enough. We need to make sure that at least
DLGLOBAL is present. Instead of doing that make sure that we have
enough entries.
==26163== Conditional jump or move depends on uninitialised value(s)
==26163== at 0x403B289: osmo_vlogp (logging.c:290)
==26163== by 0x403B3DA: logp2 (logging.c:339)
==26163== by 0x804D027: gbprox_relay2bvci (gb_proxy.c:347)
==26163== by 0x804D3CF: gbprox_rx_sig_from_sgsn (gb_proxy.c:589)
==26163== by 0x804DBFC: gbprox_rcvmsg (gb_proxy.c:685)
==26163== by 0x4052CB0: gprs_ns_process_msg (gprs_ns.c:669)
==26163== by 0x4052F70: gprs_ns_rcvmsg (gprs_ns.c:1053)
==26163== by 0x804BB49: gprs_process_message (gbproxy_test.c:488)
==26163== by 0x804BC4C: send_ns_unitdata (gbproxy_test.c:210)
==26163== by 0x804BDE8: send_bssgp_reset_ack (gbproxy_test.c:243)
==26163== by 0x804B54F: main (gbproxy_test.c:863)
==26163==
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When the command was added it was not verified that. Add a very
basic MGCP VTY test and test that the string appears in the config.
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The peers are (talloc) children of the GPRS NS. This means the
peers (and the rate counters) are currently being deleted twice.
==23446== Invalid write of size 4
==23446== at 0x403C243: rate_ctr_group_alloc (linuxlist.h:66)
==23446== by 0x4050974: gprs_nsvc_create (gprs_ns.c:209)
==23446== by 0x405320D: gprs_ns_instantiate (gprs_ns.c:1330)
==23446== by 0x804ABEB: main (gbproxy_test.c:666)
==23446== Address 0x4300694 is 52 bytes inside a block of size 784 free'd
==23446== at 0x4029DA8: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==23446== by 0x4041B9D: _talloc_free (talloc.c:609)
==23446== by 0x4043292: talloc_free (talloc.c:578)
==23446== by 0x40532D3: gprs_ns_destroy (gprs_ns.c:1363)
==23446== by 0x804ABD7: main (gbproxy_test.c:660)
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This adds a test case with several messages to test BSSGP patching.
New messages:
- BSSGP/DTAP Attach Request
- BSSGP/DTAP Attach Accept
- BSSGP/DTAP Routing Area Update Request
- BSSGP/DTAP Routing Area Update Accept
- BSSGP/DTAP Activate PDP Context Request
- BSSGP SUSPEND
- BSSGP SUSPEND ACK
Sponsored-by: On-Waves ehf
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This function abstracts identical code sequences that are used at
multiple places.
Sponsored-by: On-Waves ehf
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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
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Currently the terms 'Routing area code' (RAC) and 'Location area
code' (LAC) are used in several places where 'Routing area
identification' (RAI) or 'Location area identification' (LAI) are
meant in fact.
This patch replaces RAC/LAC by RAI/LAI and 'code' by 'identification'
at these places.
Note that RAI := MCC MNC LAC RAC, and LAI := MCC MNC LAC (see GSM
03.03, sections 4.1 and 4.2).
Sponsored-by: On-Waves ehf
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Currently when ftmp_extra is set, a doubled a=rtpmap line is emitted
instead of the fmtp_extra info.
This patch fixes replaces the formerly copied and pasted but not
modified snprintf parameters by the correct ones.
Fixes: Coverity CID 1220873
Sponsored-by: On-Waves ehf
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Add tests setting the fmtp_extra field to check the response
generation. This triggers a bug found by Coverity.
Addresses: Coverity CID 1220873
Sponsored-by: On-Waves ehf
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Currently, if there is no SDP data in the MGCP message received from
the net, the fields containing audio encoding information are not set
in net_end. So in recvonly mode transcoding would not be set up
correctly.
This patch changes the implementation of the code handling CRCX and
MDCX to use the codec signalled in the MGCP local connection options
(field 'a:') if there isn't any SDP data. This is only halfway
negotiation, because the codec is used blindly and not matched
against the supported ones.
Sponsored-by: On-Waves ehf
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This patch moves the files relevant to transcoding from
src/osmo-bsc_mgcp to src/libmgcp and src/include/openbsc. Makefiles
and include directives are being updated accordingly.
Sponsored-by: On-Waves ehf
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This patch adds test cases for transcoding and repacking.
Sponsored-by: On-Waves ehf
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The code currently uses an encoded sequence of (hex) 10 20 30 40 50
60 as RAI, for which no bijective mapping to the set of
representations MCC-MNC-LAC-RAC exists.
This patch changes the hard-coded RAI to 11 22 33 40 50 60 which maps
to 112-332-16464-96 (and vice-versa).
Sponsored-by: On-Waves ehf
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This addresses an ASAN issue where the request was already deleted
by our callback function.
(gdb) where
#0 0xb69e7810 in __asan_report_error () from /usr/lib/i386-linux-gnu/libasan.so.0
#1 0xb69e0aff in __asan_report_store4 () from /usr/lib/i386-linux-gnu/libasan.so.0
#2 0x0804ea64 in subscr_send_paging_request (subscr=subscr@entry=0xb5103cb0)
at gsm_subscriber.c:212
#3 0x0804edac in subscr_get_channel (subscr=subscr@entry=0xb5103cb0, type=type@entry=2,
cbfn=cbfn@entry=0x804969d <subscr_cb>, param=param@entry=0x2342) at gsm_subscriber.c:246
#4 0x080498f7 in main (argc=1, argv=0xbffff804) at channel_test.c:77
Breakpoint 3, subscr_paging_dispatch (hooknum=hooknum@entry=101, event=event@entry=200,
msg=msg@entry=0x1323, data=<optimized out>, data@entry=0x8063900 <s_conn>,
param=<optimized out>, param@entry=0xb5103cb0) at gsm_subscriber.c:126
126 llist_del(&request->entry);
(gdb) b llist_del
(gdb) bt
#0 subscr_paging_dispatch (hooknum=hooknum@entry=101, event=event@entry=200,
msg=msg@entry=0x1323, data=<optimized out>, data@entry=0x8063900 <s_conn>,
param=<optimized out>, param@entry=0xb5103cb0) at gsm_subscriber.c:126
#1 0x0804e8a9 in subscr_paging_cb (hooknum=101, event=200, msg=0x1323,
data=0x8063900 <s_conn>, param=0xb5103cb0) at gsm_subscriber.c:187
#2 0x080497e9 in paging_request (bts=0xb5b03e70, subscriber=subscriber@entry=0xb5103cb0,
type=2, cbfn=cbfn@entry=0x804e881 <subscr_paging_cb>, data=data@entry=0xb5103cb0)
at channel_test.c:51
#3 0x0804ea39 in subscr_send_paging_request (subscr=subscr@entry=0xb5103cb0)
at gsm_subscriber.c:207
#4 0x0804edac in subscr_get_channel (subscr=subscr@entry=0xb5103cb0, type=type@entry=2,
cbfn=cbfn@entry=0x804969d <subscr_cb>, param=param@entry=0x2342) at gsm_subscriber.c:246
#5 0x080498f7 in main (argc=1, argv=0xbffff804) at channel_test.c:77
(gdb) q
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In ae1997248ccb4fba1394267d3051082dfd85448a the handwritten tokenizer
was replaced with strtok_r. As part of this change the structural
checking of MGCP parameters was stopped. This means that a code like
"line + 3" might access beyond the first NUL and be possibly behind
the msgb. Manually add size checking again. Manually jumping to the
error label is not possible anymore as it has been removed. The result
is that invalid lines will be skipped. This is matching the general
approach by the IETF RFCs to be permissive in data being received.
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This patch adds the voice muxer. You can use this to batch RTP
traffic to reduce bandwidth comsuption. Basically, osmux transforms
RTP flows to a compact batch format, that is later on decompacted
to its original form. Port UDP/1984 is used for the muxer traffic
between osmo-bsc_nat and osmo-bsc_mgcp (in the BSC side). This
feature depends on libosmo-netif, which contains the osmux core
support.
Osmux is requested on-demand via the MGCP CRCX/MDCX messages (using
the vendor-specific extension X-Osmux: on) coming from the BSC-NAT,
so you can selectively enable osmux per BSC from one the bsc-nat.cfg
file, so we have a centralized point to enable/disable osmux.
First thing you need to do is to accept requests to use Osmux,
this can be done from VTY interface of osmo-bsc_nat and
osmo-bsc_mgcp by adding the following line:
mgcp
...
osmux on
osmux batch-factor 4
This just initializes the osmux engine. You still have to specify
what BSC uses osmux from osmo-bsc_nat configuration file:
...
bsc 1
osmux on
bsc 2
...
bsc 3
osmux on
In this case, bsc 1 and 3 should use osmux if possible, bsc 2 does
not have osmux enabled.
Thus, you can selectively enable osmux depending on the BSC, and
we have a centralized point for configuration from the bsc-nat to
enable osmux on demand, as suggested by Holger.
At this moment, this patch contains heavy debug logging for each
RTP packet that can be removed later to save cycles.
The RTP ssrc/seqnum/timestamp is randomly allocated for each MDCX that
is received to configure an endpoint.
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Use the already created subscriber, create a sms and read it
back from the subscriber.
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Verify that '0X' numbers are parsed correctly from the wire
interface.
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Add the control interface with no hierachy right now and implement
the first command to list IMSI + Context Address of active sessions.
sgsn_cmd_handle could share more code with bsc variant.
Fixes: SYS#264, SYS#265
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This is only useful for small networks. List the IMSI and MSISDN
of all active subscribers.
Fixes: SYS#266
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Sadly there is no proper foreign key relationship on the tables
that related to the Subscriber. This means we can't use a DELETE
with Cascade and need to delete everything by hand. To make things
worse maybe the SMS/Paging code is still using the subscriber
making the operation more dangerous. I had added NULL checks for
sender_id/receiver_id at 30C3 so we should not crash in this
situation.
Fixes: SYS#274
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The test has been manually verified. Executing the select for
the subscribers showed:
sqlite> select * from Subscriber;
1|2014-03-23 12:12:46|2014-03-23 12:19:09|2620345||445567|1||0|
This created a subscriber with the right IMSI, MSISDN and has
it authorized.
Fixes: SYS#275
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In case the BTS is connected the new attribute should be set
through OML. This is left as a todo item.
Addresses: SYS#267
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The new definitions are: half rate and AMR
Change of definition name for bad frame, because it applies to all types of
traffic, not only TCH/F.
Increase MNCC interface version to 4. Version 3 is skipped, because it was
used by older version of Linux-Call-Router which is incompatible with the
current version of the MNCC interface.
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