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Add FSMs:
- timeslot_fsm: handle dynamic timeslots and OML+RSL availability.
- lchan_fsm: handle an individual lchan activation, RTP stream and release,
signal the appropriate calling FSMs on success, failure, release.
- mgw_endpoint_fsm: handle one entire endpoint with several CI.
- assignment_fsm: BSSMAP Assignment Request.
- handover_fsm: all of intra, inter-MO and inter-MT handover.
Above FSMs absorb large parts of the gscon FSM. The gscon FSM was surpassing
the maximum amount events (32), and it is more logical to treat assignment,
handover and MGW procedures in separate FSMs.
- Add logging macros for each FSM type:
- LOG_TS()
- LOG_LCHAN()
- LOG_MGWEP(), LOG_CI()
- LOG_ASSIGNMENT()
- LOG_HO()
These log with the osmo_fsm_inst where present.
New style decision: logging without a final newline char is awkward,
especially for gsmtap logging and when other logs interleave LOGPC() calls;
we have various cases where the final \n goes missing, and also this invokes
the log category checking N times instead of once.
So I decided to make these macros *always* append a newline, but only if
there is no final newline yet. I hope that the compiler optimizes the
strlen() of the constant format strings away. Thus I can log with or without
typing "\n" and always get an \n termination anyway.
General:
- replace osmo_timers, state enums and program-wide osmo_signal_dispatch()
with dedicated FSM timeouts, states and events.
- introduce a common way to handle Tnnn timers: gsm_timers.h/.c: struct T_def.
These can be used (with some macro magic) to define a state's timeout once,
and not make mistakes for each osmo_fsm_inst_state_chg().
Details:
bsc_subscr_conn_fsm.c:
- move most states of this FSM to lchan_fsm, assignment_fsm, handover_fsm and
mgw_endpoint_fsm.
- There is exactly one state for an ongoing Assignment, with all details
handled in conn->assignment.fi. The state relies on the assignment_fsm's
timeout.
- There is one state for an ongoing Handover; except for an incoming Handover
from a remote BSS, the gscon remains in ST_INIT until the new lchan and conn
are both established.
- move bssmap_add_lcls_status() to osmo_bsc_lcls.c
abis_rsl.c:
- move all dynamic timeslot logic away into timeslot_fsm. Only keep plain send/receive functions in
abis_rsl.c
- reduce some rsl functions to merely send a message, rename to "_tx_".
- rsl_ipacc_mdcx(): add '_tx_' in the name; move parts that change the lchan state out into the
lchan_fsm, the lchan->abis_ip.* are now set there prior to invoking this function.
- move all timers and error/release handling away into various FSMs.
- tweak ipa_smod_s_for_lchan() and ipa_rtp_pt_for_lchan() to not require an
lchan passed, but just mode,type that they require. Rename to
ipacc_speech_mode*() and ipacc_payload_type().
- add rsl_forward_layer3_info, used for inter-BSC HO MO, to just send the RR
message received during BSSMAP Handover Command.
- move various logging to LOG_LCHAN() in order to log with the lchan FSM instance.
One drawback is that the lchan FSM is limited to one logging category, i.e. this moves some logging
from DRR to DRSL. It might actually make sense to combine those categories.
- lose LOGP...LOGPC logging cascades: they are bad for gsmtap logging and for performance.
- handle_classmark_chg(): change logging, move cm2 len check out of the cm3 condition (I hope that's
correct).
- gsm48_send_ho_cmd(): split off gsm48_make_ho_cmd() which doesn't send right away, so that during
inter-bsc HO we can make an RR Handover Command to send via the MSC to the remote BSS.
assignment_fsm.c:
- the Chan Mode Modify in case of re-using the same lchan is not implemented
yet, because this was also missing in the previous implementation.
Depends: I03ee7ce840ecfa0b6a33358e7385528aabd4873f
Change-Id: I82e3f918295daa83274a4cf803f046979f284366
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Change-Id: If212fcd042051b6fa53484254223614c5b93a9c6
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It doesn't make sense to spread them all over the place, and introduces odd
dependencies from utility programs or regression test linkages.
This is a cosmetic patch preparing for lchan activation refactoring.
Change-Id: Ie8ee334145bf7bc3a601d395ea7ab9b2009b61c7
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In certain situations like handover or assignment, DTAP must not go out via RSL
directly but is cached to be submitted later. Make sure that all RSL DTAP
sending adheres to this:
gscon_submit_rsl_dtap() is the new "public" API to request an RSL DTAP to be
sent. Depending on the gscon's state, this ends up in the cache or is sent
directly. When caching, there is no way to tell whether sending will succeed or
not, so semantically it does not make sense to even return a result code. Just
return void. Change all "public" callers to gscon_submit_rsl_dtap().
Merge gsm0808_submit_dtap() and submit_dtap() guts to gsm0808_send_rsl_dtap(),
static in bsc_subscr_conn_fsm.c: directly send DTAP, assume a conn->lchan to be
present, or otherwise trigger a BSSMAP Clear Request.
The static submit_dtap() becomes a thin convenience wrapper.
Move ho_dtap_cache* functions to bsc_subscr_conn_fsm.c and rename to
gscon_dtap_cache_* -- they are not only for handover, also for assignment.
Function gsm0808_submit_dtap() m
Introduce function gscon_submit_rsl_dtap()
Change-Id: I6ffd7aa641c8905292c769400048c96aa0949585
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Change-Id: I0153d7069817fba9146ddc11214de2757d7d37bf
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The GSCON FSM does not care about the codec information when performing
interactions with the MGW. Before upgrading the client the codec
information was hardcoded to AMR inside the client. Now the client
offers APIs to set the codec information. Since this feature is new,
osmo-bsc does not set any codec information yet, which causes many of
the TTCN3 tests to fail. So lets add some logic to pick suitable codec
info.
- Hardcode ptime to 20 (is the same for all possible codecs)
- Select a codec according to the flags in userplane
Change-Id: Ibddc3492572b39f166e3a1b8b8120813ce2dadc2
Related: OS#2728
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Move to gsm_04_08_utils.c so that it's possible to use it without
linking/stubbing all of RSL.
Change-Id: I6e90831d7e618ce3c8e7417082a82c97f6681668
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Commit "dyn ts, bts_ipaccess_nanobts.c: init PDCH on Chan OPSTART ACK"
bf7099262adf0f27e71a08387747c5cb0d459360 Icf6e25ff068e8a2600562d52726ead65e864ec02
introduced signal S_NM_OPSTART_ACK and passed the FOM header to identify the BTS
by. But the FOM header's BTS number is zero on each Abis/IP link, and the BTS
and TRX are actually identified by msgb->dst == e1inp_sign_link, member trx. So
the initial implementation associated *all* Channel OPSTART ACKs with BTS 0.
Pass the entire msgb as S_NM_OPSTART_ACK signal argument, implement a
abis_nm_get_ts() to retrieve the proper timeslot and use that during timeslot
init.
Related: OS#3351 OS#3205
Change-Id: I45ce5c24cb62d00f350df1af1be6c11104d74193
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Change-Id: I74e0e40ee6b2ce66d76f151528d9a958683944c7
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Change-Id: I2ce242e97445785c3f1d965d89e3f1b6ca6a37ab
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Change-Id: If5691d8e8bae7166e06382db589850ce94c20a30
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When we receive a RSL CONN FAIL IND, it may be that this happens
before any RLL is established (and hence a lchan->conn exists),
or after the RLLs have been shut down (and hence a lchan->conn doesn't
exist anymore).
So in this function, it is not legal to unconditionally dereference
lchan->conn.
Change-Id: I6380f5d2cd9364560ce3947517c84247cf4af0d4
Closes: OS#3182
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3GPP TS 48.006 section 9.2 states clearly that any SCCP connection
release must be initiated by the MSC.
for bsc_subscr_conn_fsm, this means that even after sending the
BSSMAP CLEAR COMPLETE, we must not terminate the FSM, as this would
cause a N-DISCONNET.req to be sent to the stack for the associated
SCCP connection.
The bsc_subscr_conn_fsm instances will hence stay alive until the MSC
eventually decises to release them.
Change-Id: Iaaca220b598609b77b600fcfc2f9a78b221c1fbb
Closes: OS#3331
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Change-Id: Ia8c8303a87412ce6456c38ae29e3c55de9522ac0
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We use the newly-introduced logging_vty_add_deprecated_subsys() from
libosmovty to make sure old config files will still parse even after
this change.
Change-Id: Ib4f67bb00e1d5460e643717b53f6a4d81278dc5d
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In Change-Id OSI6b7354f3b23a26bb4eab12213ca3d3b614c8154f we introduced
a function called osmo_ss7_asp_rx_unknown() which was supposed ot
override a weak symbol in libosmo-sigtran. However, the related change
in libosmo-sigtran (I8616f914192000df0ec6547ff4ada80e0f9042a2) was
modified later on to use explicit registration of a call-back function
instead of weak symbol override.
Let's adopt the osmo-bsc code to make use of this explict call-back
registration.
Change-Id: Id5880ec90dfa00b29cbb0ffea8c8dd50e24742bd
Related: OS#2012
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In Change-Id I6b7354f3b23a26bb4eab12213ca3d3b614c8154f we removed
the "dest" vty command, but we should simply ignore it and print
a related warning during start.
Change-Id: I531825061031918bbb1380e1b485b711e81bcd75
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Change-Id: I112c0db17d355d57eb08bc67121ccf49fbf53943
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Change-Id: Ief20cb0f46dd93f46dd765dca307724dc2b3487c
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Will be used in upcoming inter-BSC handover.
Change-Id: If9ecccc793426d214019f299b19d6ffa5a186546
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Do not invoke OSMO_STRINGIFY() with arbitrary names, just quote instead.
The idea was that OSMO_STRINGIFY() avoids typos by ensuring well-defined names
are stringified, but this highlights that OSMO_STRINGIFY() is in fact usable
with completely arbitrary arguments and actually lacks the validation part :/
Change-Id: I458cd2cd0d6ddb0e6db3bb8d546a20336ae8c5f1
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Another small step towards being aware of the subscriber identity.
Any connection initiated by paging will subsequently log the subscriber's
identity -- of course not necessarily the IMSI, if paging was done by TMSI.
This is only for Paging, not the Paging Response; for that see, L3 Complete.
Related: OS#2969
Change-Id: I0ab7bedfe693bb4e42a04fb0585b94a730ff2d9b
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This is a tiny step towards being aware of a connection's subscriber identity.
Iff the Layer 3 Complete message contains an IMSI, associate a bsc_subscr with
the conn, so that subsequent logging and possibly meas_feed contains the IMSI.
For any L3 Complete using TMSI, this has no effect whatsoever.
Related: OS#2969
Change-Id: I3b696a0c0932e3abcb682ba231db65755d8c27a6
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Keep the bsc_subscr associated with the conn as long as possible, to benefit
logging, which then contains the subscriber identity (if any).
Change-Id: Ifa528b58842a02509bfe0af6915c64bd67058bcd
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Instead of silently setting the use count to 1, instead increment with an
explicit bsc_subsct_get(), which then logs the event along with the place that
created the subscriber.
Change-Id: Ia72f8010b7b2e1ca44e3b005c0f2c05f3eeae8d5
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Change-Id: I28addc9a16a4c81978290303d368f630a8334228
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The guts of bssap_speech_from_lchan() and lchan_to_chosen_channel() have been
moved to libosmocore; call those instead.
The return value of bssap_speech_from_lchan() used to be -1 on error, now the
error value is 0. The only caller did not handle -1 properly, but fed it
directly to a uint8_t.
On gsm0808_chosen_channel() error, log the error. Proper handling is missing.
Fixing the error handling in send_ass_compl() is a separate issue: currently it
is limited to logging, there is no way to return an error yet, nor any actions
to take on error.
Depends: Icca23940791f97fa64dbc3f2734270b99f9550c1 (libosmocore)
Change-Id: Ib5c940a9dae11c5e26d4b47fa9d95fef889ad2f6
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Change-Id: Ib61125ebc41e55dc4a6595db8c8559c62b3ed2c0
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In each code path within rsl_rx_chan_act_nack(), do separate logging of the
NACK to ensure proper termination of each log line.
When receiving a Chan Act NACK, we possibly mixed a LOGP() within an
unterminated other LOGP() that had not been ended with a LOGPC() yet.
Change-Id: Icd2772b21ef3a2ff5af11b7c92dff0ecb4d87ff0
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When the BTS responds with a Chan Act NACK, i.e. the lchan could not be
activated, immediately signal Assignment Failure to the MSC (in
handle_chan_nack()).
In handle_chan_nack(), adjust log: instead of waiting for timeout, we now
signal Assignment Failure.
Drop misleading logging from bsc_assign_fail(): instead of transmitting the
Assignment Failure message, it actually signals an FSM event. Leave logging of
that to the FSM logging.
Change-Id: Ib204b4a5272f9b7b60ca5f932cd8a4c857316270
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Call one common function to signal Assignment Failure and transition back to
ST_ACTIVE.
Change-Id: I1ce10a3ead286cdb6ad529fc293b6cecd151cc9a
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Change-Id: I64ac2a17634f18322828ee2aa2284b0513130488
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struct bsc_api was used to provide an abstract API for both osmo-bsc and
osmo-msc, between BSC and MSC. That's no longer needed, so get rid of it, to
prevent code turbulences it creates for no reason.
Change-Id: I3fd5888c63a0b4f95520a498320aa105a6d60579
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Move all of libbsc/ into osmo-bsc/, and separate/move some implementations to
allow linking from utils/* and ipaccess/* without pulling in unccessary
dependencies.
Some utilities use gsm_network and gsm_bts structs, which already include data
structures for fairly advanced uses. Move initialization that only osmo-bsc
needs into new bsc_network_init() and bsc_bts_alloc_register() functions, so
that the leaner tools can use the old gsm_* versions without the need to link
everything (e.g. handover and lchan alloc code).
In some instances, there need to be stubs if to cut off linking "just before
the RSL level" and prevent dependencies from creeping in.
- abis_rsl_rcvmsg(): the only program currently interpreting RSL messages is
osmo-bsc, the utils are merely concerned with OML, if at all.
- paging_flush_bts(): ip.access nanobts models call this when the RSL link is
dropped. Only osmo-bsc actually needs to do anything there.
- on_gsm_ts_init(): the mechanism to trigger timeslot initialization is related
to OML, while this action to take on init would pull in RSL dependencies.
utils/ and ipaccess/ each have a stubs.c file to implement these stubs. Tests
implement stubs inline where required.
From src/utils/, src/ipaccess/ and tests/*/, link in .o files from osmo-bsc/.
In order for this to work, the osmo-bsc subdir must be built before the other
source trees. (An alternative would be to include the .c files as sources, but
that would re-compile them in every source tree. Not a large burden really, but
unless linking .o files gives problems, let's have the quicker build.)
Minor obvious cleanups creep in with this patch, I will not bother to name them
individually now unless code review asks me to.
Rationale:
1) libbsc has been separate to use it for osmo-nitb and osmo-bsc in the old
openbsc.git. This is no longer required, and spreading over libbsc and osmo-bsc
is distracting.
2) Recently, ridiculous linking requirements have made adding new functions
cumbersome, because libbsc has started depending on osmo-bsc/*.c
implementations: on gscon FSM and bssap functions. For example, neither
bs11_config nor ipaccess-config nor bts_test need handover_cfg or BSSMAP
message composition. It makes no sense to link the entire osmo-bsc to it, nor
do we want to keep adding stubs to each linking realm.
Change-Id: I36a586726f5818121abe54d25654819fc451d3bf
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Only count paging responses which can be mapped to an active paging.
Unsolicited paging responses which do not correspond to an active paging
would increment the 'paging response' counter. This means the number of
paging attempts could be smaller than the number of paging responses,
which can look confusing in the 'show statistics' VTY command.
Change-Id: I7cfc7c29fb7570d41e3ac23cca17f5b98b303506
Related: OS#66
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If we receive a BSSMAP ASSIGNMENT REQ for a speech channel
containing only a CIC but no AoIP transport layer address, then that's
illegal and must be rejected.
In Change-Id If362a0084de452727cd063063dfb645eca2f9beb we re-introduced
accepting CIC-only ASSIGNMENT REQ, but we failed to verify that this
actually only happens over a SCCPlite A interface.
This fixes the BSC_Tests.TC_assignment_cic_only testcase.
Change-Id: Ia6e3897edca48b9f838ea69939d9b8be7185abf8
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The user might not want to enable LCLS support for administrative
reasons. So let's keep it disabled by default, until somebody
explicitly enables it with "lcls-mode mgw-loop".
In the future, we may want to introduce a "lcls-mode bts-loop" where we
don't loop at the BSC-colocated MGW, but where we instruct the BTSs to
feed the RTP directly to each other. This would require a
falt/transparent IP routing between the BTSs in the RAN.
Change-Id: Ied7985056c8cd182bf16119007a08cc5be14459b
Related: OS#1602
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This code contains the following code:
* receive/parse/interpret LCLS specific BSSMAP IEs and PDUs
* osmo_fsm handling the various states and their transitions
* call leg correlation (finding the other subscr_conn with same GCR)
* communication between the two call-leg LCLS FSMs
* detection of supported / unsupported LCLS configurations
* display of GCR / LCLS information in "show conns"
* switch the media streams locally using MDCX to the MGW
Closes: OS#1602
Change-Id: I614fade62834def5cafc94c4d2578cd747a3f9f7
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We now print information such as
* SCCP connection ID
* MSC number
* handover decision2 fail count
* channel mode (SIGN/SPEECH)
* MGW endpoint
* secondary lchan (if any, e.g. during assignment)
* don't crash if conn->lchan == NULL
Change-Id: I2f8000844afc9da93ca39976399e5f76a45530de
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Change-Id: I7928d78e2ce3e6eca545455d08bc89ca67e01f9f
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Change-Id: I67659275beda1b6a89bdf11eb0231438b0c8b912
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Also change format of related debug message to match similar format than
gsm_ts_and_pchan_name().
Change-Id: Id4f875944c40fd862fc63feec82216c45d2e41c2
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Right now, it's impossible to see any ACC Ramping information unless RSL
category is set to DEBUG. Barring and Allowing Access Control Class is
an important event which should be printed in most cases.
Increase log levels of messages printed during some error conditions to
be handled as errors.
Change-Id: I5404e91fe7c0b3209e8033594e659387bbc924d6
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It's not a good idea to keep extern declarations copied over
half a dozen C files. Let's move it to a header.
Change-Id: I6f643f1393ba0955d9c0cf1cf78d5c604e7b9451
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The bsc_msc_connection dates back to the old pre-libosmo-sigtran
days, and 90% of the field members weren't used at all (even the
new sigtran specific ones!). Let's merge what remains into struct
bsc_msc_data.
As a side effect, the already dysfunctional "dest A.B.C.D" VTY
command has been removed from the MSC node.
There's quite a bit of fall-out in the CTRL interface, which was
the code with strongest ties to bsc_msc_connection. This was
resolved by properly porting CTRL handling over to libosmo-sigtran,
meaning that an IPA/SCCPlite connected MSC can now again send CTRL
GET/SET commands, and can also receive those selective few TRAPs
that old osmo-bsc-sccplite also sent to its MSC[s].
Change-Id: I6b7354f3b23a26bb4eab12213ca3d3b614c8154f
Related: OS#2012
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osmo-bsc_nat is too heavily tied into legacy SCCPlite code, as it
is not using libosmo-sigtran/osmo_ss7 so far. It's also full of
customer-specific code and it's shared use of some libbsc code here
has been complicating osmo-bsc development.
The current plan is to continue to use osmo-bsc_nat from openbsc.git
for those legacy users that need it, and not use osmo-bsc_nat in
new 3GPP AoIP setups. Should we ever get a strong demand for an AoIP
based bsc_nat, we can still revisit this later.
Change-Id: Ia05dc76336a64a7f08962843b9a7cc19f2c83387
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In IPA/SCCPlite, the MSC is handling MGCP to the BSC-MGW directly
and the BSC only takes care of the BTS-side MGCP connection. We
achieve this by transitioning directly from WAIT_MDCX_BTS into ACTIVE
in this case.
Change-Id: I96179b4324b976bded36023a8ccbdc007b6b3e05
Related: OS#2544
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Change-Id: I6ace15f368b5ba6e5c8845ea21d17dd3a7a15be7
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Change-Id: If362a0084de452727cd063063dfb645eca2f9beb
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In IPA/SCCPlite, we have to use the CIC to construct the MGCP
endpoint name instead of the usual dynamic endpoint allocation.
Change-Id: I03e2cdbc8e40169e52df3720c40b66734e880525
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