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* NS: Factor out gprs_nsvc_start_test() and use itHarald Welte2019-02-263-15/+21
| | | | | | | | | | | | This function performs sending a NS-ALIVE PDU and starting Tns-Test, let's use it in all places where we used to do that. As part of this, also fix a bug where the sendto() return value (number of bytes sent) would actually propagate up all the way to gprs_ns_rx_reset() return value, which in turn affects the test results on stdout. Change-Id: I4d303117f77fabb74bbb91887b9914a81c2a084a
* gprs_ns: Add code for SNS-SIZE and SNS-CONFIG encodingHarald Welte2019-02-264-3/+207
| | | | | | | | | | | Modern NS specifications contain a SNS (Sub Network Service) for negotiating IP/port/weight parameters of NS-over-IP links dynamically. This patch adds message encoding routines for SNS-CONFIG, SNS-SIZE and their respective acknowledgements. Related: OS#3372 Change-Id: I5c47e1c3c10deb89a7470ee2c03adfc174accc93
* enlarge gsm0808 msgb headroomNeels Hofmeyr2019-02-261-2/+2
| | | | | | | | | | | | | | | | It should be large enough to prepend a struct osmo_scu_prim to pass down an SCCP stack (see libosmo-sccp). 264 should suffice, but pick the next larger power-of-two instead. In osmo-msc, I would like to prepend an osmo_prim to the msgb created by gsm0808 API, but turns out the headroom is too small: msgb(0x61700001b660): Not enough headroom msgb_push (126 < 264) Instead of always copying a msgb that has just that instant been created, it makes more sense to allocate sufficient headroom in the first place. Change-Id: I95729991eb49555f8bba60c5dc916131b03b6cf2
* LCLS: add string dump helpersMax2019-02-266-3/+54
| | | | | | | | | Add functions to dump LCLS (without GCR) and GCR. Dumping entire struct results in inconveniently long string hence the separate functions. Both use talloc functions so they expect caller to take care of providing proper allocation context and freeing memory. Change-Id: Ic3609224c8f3282d667e75f68bc20327e36eb9e6
* GPRS: Doxygen documentation for 'struct libgb_msgb_cb'Harald Welte2019-02-231-4/+4
| | | | Change-Id: I4144506feee74a8219bd3736087c30cc6323ec1d
* NS: Add missing NS Cause stringsHarald Welte2019-02-231-0/+7
| | | | | | | | When I added the definitions for the IP-SNS in commit f030b210e8c13314d361a6b721a0cbcc72935219 back in 2010, I forgot to update the string definitions in ns_cause_str[]. Let's fix that Change-Id: I419ccc482d99b01263a60aede83dacd2d9de56ab
* NS: Don't print information about FR/GRE if not enabled!Harald Welte2019-02-231-3/+4
| | | | Change-Id: I9209ee4ba5ebfc4f96b4c1d42840e1906455bae7
* Add multipatch capability to osmo-config-mergeMax2019-02-221-21/+45
| | | | | | | | | | That's pretty straightforward and convenient extention: handle all extra positional arguments as patch file names. This makes it similar to 'cp' and other coreutils basic tools. For example: osmo-config-merge base.cfg patch1.cfg patch2.cfg patch3.cfg will apply 3 patches to the base config file. Change-Id: I212cbdc3bf6f251c1a3175737ac74242fb004c6d
* select: Call log_reset_context() before calling file descriptor callbacksHarald Welte2019-02-211-0/+6
| | | | | | | | | | Make sure to clear any log context before processing the next incoming message as part of some file descriptor callback. This effectively prevents "context leaking" from processing of one message into processing of the next message as part of one iteration through the list of file descriptors here. Change-Id: I3644c7bc1a9cec5858eb0faf94efc8c3ba7f5d8d Closes: OS#3813
* gprs_ns: Add missing NSVCI IE to NS-BLOCK-ACK messageHarald Welte2019-02-191-1/+29
| | | | | | | | According to Section 9.2.4 of 3GPP TS 48.016, the NS-BLOCK-ACK PDU has a mandatory NSVCI IE which we so far were missing. Change-Id: Ie7205e99d57f1e42d941f1be2460d8c9f46aadfe Closes: OS#3808
* gprs_ns: Declare gprs_ns_tx_alive*() in header fileHarald Welte2019-02-191-0/+2
| | | | | | | The symbols for those functions were always exported, but we somehow didn't declare them in gprs_ns.h Change-Id: Ib073e9c93fcdf408b63000182e90aabce37f687e
* gprs_ns.c: cosmetic whitespace fixesHarald Welte2019-02-191-2/+2
| | | | Change-Id: Ic19f65bdc5527ad5a69d0a92320ce5f672bf4d2b
* gprs_ns: Use gprs_ns_tx_alive() instead of gprs_ns_tx_simple()Harald Welte2019-02-191-2/+2
| | | | | | If we use gprs_ns_tx_alive() we will get logging for free. Change-Id: I53d410d13540d389096c40425e1fa2eb7460b16b
* bssgp_tx_bvc_unblock(): Fix log messageHarald Welte2019-02-191-1/+1
| | | | | | | We're transmitting a BVC-UNBLOCK but the log states the opposite: BVC-BLOCK. Let's fix that. Change-Id: I70fa7336402d193513f89fcf3068b0b21925702d
* rsl: Support PDCH in rsl_chan_nr_strPau Espin Pedrol2019-02-181-0/+2
| | | | | | | | | | | | | | During log review lack of support for PDCH was spotted: scheduler.c:593 Configuring multiframe with PDCH trx=0 ts=4 rsl.c:1159 (bts=0,trx=0,ts=4,ss=0): chan_nr=UNKNOWN on TS4 type=0x00 mode=SIGNALLING rsl.c:741 (bts=0,trx=0,ts=4,pchan=TCH/F_TCH/H_PDCH as PDCH) (ss=0) PDTCH Tx CHAN ACT ACK Wireshark shows: 1100 0... = C-bits: PDCH (24) .... .100 = Time slot number (TN): 4 Change-Id: If6ed96c9eb0431eb24e2135634def61e0ea506ea
* gsm0808: Add unit tests for test_create_clear_command2()Harald Welte2019-02-182-0/+26
| | | | | Change-Id: Ie3f34b78edc91a013152742bebbd839586a787fe Related: OS#3805
* gsm0808: comment about difference of gsm0808_create_clear_command()Harald Welte2019-02-181-1/+4
| | | | | | | | This single function has a quite different behavior than the other gsm0808_ functions in terms of how the resulting msgb l3h pointers are set. Let's document that to avoid more confusion. Change-Id: I0367760a588fc968c5a2dea46001ef1ee7965c8c
* Fix BSSMAP length generated by gsm0808_create_clear_command2()Harald Welte2019-02-181-1/+7
| | | | | | | | | | In Change-Id Id8a75e1da2d5f520064666e4ee413d1c91da6ae3 we recently introduced adding the "CSFB INDICATOR" IE to the CLEAR COMMAND, but we did so with a wrong length value. Change-Id: I4d07d25fb03ca0f89fd7b94226c54309c77a010a Closes: OS#3805 Related: OS#2778
* add OSMO_STRBUF_PRINTF()Neels Hofmeyr2019-02-173-0/+188
| | | | | | | | | | We are using macros like this or different workarounds in libmsc. In the course of implementing inter-MSC handover, I am encountering yet another such situation of appending multiple strings to a limited char buffer. Standardize. Add a unit test to utils_test.c. Change-Id: I2497514e26c5e7a5d88985fc7e58343be1a027b2
* gsm_08_08.h: Add constants for Channel Type in signalling modeSylvain Munaut2019-02-171-0/+14
| | | | | | | | This is from TS 08.08 3.2.2.11 directly. The choices for Data mode and Speech mode were already present, but not for Signalling mode Change-Id: I9e24841ea877a9a78dc4d2bd14cbf60c4bea79a6 Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
* fix osmo_gsm48_classmark* libosmogsm.map entriesNeels Hofmeyr2019-02-151-6/+6
| | | | | | | | When the initial patch was tweaked from osmo_classmark_* to osmo_gsm48_classmark_* naming, the libosmogsm.map entries were forgotten to be changed as well. Change-Id: I53a41b5e965a529d3c146ee85102f7f1725c6014
* get_value_string(): guard against NULLNeels Hofmeyr2019-02-151-0/+3
| | | | | | | | | | | | get_value_string() conveniently prints the value number to a static buffer if it is unknown in a value_string array. Do the same if the value_string array pointer itself is NULL. If a value string array is user supplied and might be NULL, one could add a separate NULL check around it; but by making get_value_string() itself guard against NULL, another static char buffer to print the value number is avoided. Change-Id: Ie640e9258a959da8f4f9089478de993509853997
* Enable remote SIM protocol log levelMax2019-02-142-1/+6
| | | | | | | It's defined in logging.h for quite some time but is not actually enabled alongside with other internal logging categories. Change-Id: I0e7a2add6293a072752900608c8ba34cc3850f31
* gsm/gsm0480: introduce gsm0480_create_release_complete()Vadim Yanitskiy2019-02-083-1/+26
| | | | | | | | | | | | In OsmoMSC, it's required to be able to specify a particular GSM 04.07 transaction ID for GSM 04.80 Release complete message instead of the hard-coded value, that is used gsm0480_create_ussd_release_complete(). Let's finally deprecate gsm0480_create_ussd_release_complete(), and introduce a new function without USSD prefix, as this message is also used in other "structured" supplementary services. Change-Id: Ie3ac85fcef90a5e532334ba3482804d5305c88d7
* protocol/gsm_04_14: Fix the OPEN LOOP message typeSylvain Munaut2019-02-071-1/+1
| | | | | Change-Id: Id4350dee4353ebf9de0450dd5dab6e4f2ee7c3a6 Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
* platform independence fix: tdef range testsNeels Hofmeyr2019-02-068-133/+490
| | | | | | | | | | | | | Run INT_MAX and ULONG_MAX related tests only manually, remove from automatic testing. This will hopefully fix recent build failures on various platforms. Add a 64 bit output example for expected results when invoking `./tdef_test range'. This is not checked automatically and merely serves for manual reference. For vty tests, use 32bit max values instead of INT_MAX and ULONG_MAX. Change-Id: I6242243bde1d7ddebb858512a1f0b07f4ec3e5c2
* gsm0808: Add CSFB indication IE to BSSMAP CLEAR COMMANDPhilipp Maier2019-02-053-0/+18
| | | | | | | | | | | When a call that was established in a CSFB context ends the CLEAR COMMAND that is send from the BSC to the MSC should contain a CSFB indication IE, which consists of just the IE byte itsslef. This additional IE tells the BSC to include other CSFB related IEs into the RR Release message. Change-Id: Id8a75e1da2d5f520064666e4ee413d1c91da6ae3 Related: OS#3778
* bitvec: Add bitvec_tailroom_bits() functionHarald Welte2019-02-052-0/+25
| | | | | | | | | This is similar to msgb_tailroom(): It returns the amount of space left at the end of the bit vector (compared to the current cursor). The function returns the number of bits left in the bitvec. Change-Id: I8980a6b6d1973b67a2d9ad411c878d956fb428d1
* bitvec: Add bitvec_bytes_used() functionHarald Welte2019-02-053-0/+37
| | | | | | | This new bitvec API function returns the number of bytes used in a given bit-vector. Change-Id: Id4bd7f7543f5b0f4f6f876e283bd065039c37646
* gsm_08_08.h: Add IEI definitions from Release 15Harald Welte2019-02-051-0/+5
| | | | Change-Id: If3649606ba7c25121e30ed02939ca08c94665be5
* Extend gsm_04_08.h with CSFB related definitiosn form 44.018 Rel 15Harald Welte2019-02-051-0/+2
| | | | | | These are some IEI definitions that we'll need for CSFB Fast Return Change-Id: I0e101af316438b56d63d43fc2cb16d7caf563d07
* add osmo_tdef API, originally adopted from osmo-bsc T_defNeels Hofmeyr2019-02-0418-2/+2998
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move T_def from osmo-bsc to libosmocore as osmo_tdef. Adjust naming to be more consistent. Upgrade to first class API: - add timer grouping - add generic vty support - add mising API doc - add C test - add VTY transcript tests, also as examples for using the API From osmo_fsm_inst_state_chg() API doc, cross reference to osmo_tdef API. The root reason for moving to libosmocore is that I want to use the mgw_endpoint_fsm in osmo-msc for inter-MSC handover, and hence want to move the FSM to libosmo-mgcp-client. This FSM uses the T_def from osmo-bsc. Though the mgw_endpoint_fsm's use of T_def is minimal, I intend to use the osmo_tdef API in osmo-msc (and probably elsewhere) as well. libosmocore is the most sensible place for this. osmo_tdef provides: - a list of Tnnnn (GSM) timers with description, unit and default value. - vty UI to allow users to configure non-default timeouts. - API to tie T timers to osmo_fsm states and set them on state transitions. - a few standard units (minute, second, millisecond) as well as a custom unit (which relies on the timer's human readable description to indicate the meaning of the value). - conversion for standard units: for example, some GSM timers are defined in minutes, while our FSM definitions need timeouts in seconds. Conversion is for convenience only and can be easily avoided via the custom unit. By keeping separate osmo_tdef arrays, several groups of timers can be kept separately. The VTY tests in tests/tdef/ showcase different schemes: - tests/vty/tdef_vty_test_config_root.c: Keep several timer definitions in separately named groups: showcase the osmo_tdef_vty_groups*() API. Each timer group exists exactly once. - tests/vty/tdef_vty_test_config_subnode.c: Keep a single list of timers without separate grouping. Put this list on a specific subnode below the CONFIG_NODE. There could be several separate subnodes with timers like this, i.e. continuing from this example, sets timers could be separated by placing timers in specific config subnodes instead of using the global group name. - tests/vty/tdef_vty_test_dynamic.c: Dynamically allocate timer definitions per each new created object. Thus there can be an arbitrary number of independent timer definitions, one per allocated object. T_def was introduced during the recent osmo-bsc refactoring for inter-BSC handover, and has proven useful: - without osmo_tdef, each invocation of osmo_fsm_inst_state_chg() needs to be programmed with the right timeout value, for all code paths that invoke this state change. It is a likely source of errors to get one of them wrong. By defining a T timer exactly for an FSM state, the caller can merely invoke the state change and trust on the original state definition to apply the correct timeout. - it is helpful to have a standardized config file UI to provide user configurable timeouts, instead of inventing new VTY commands for each separate application of T timer numbers. Change-Id: Ibd6b1ed7f1bd6e1f2e0fde53352055a4468f23e5
* doxygen: allow manual 'make apidoc' even if --disable-doxygenNeels Hofmeyr2019-02-041-8/+17
| | | | | | | | | | | | Even if ./configure --disable-doxygen was passed and doxygen builds are by default skipped, provide a manual 'make apidoc' target that nevertheless generates the API doc on the premise that a 'doxygen' program is available. Especially since we do a two-pass doxygen build whenever any source file changes, my guess is --disable-doxygen could be a common choice. It is then cumbersome to have to ./configure just to get one doxygen build started. Change-Id: If8d8dfb8365c8f28612b8ce2b8ddf88f74df9a90
* doxygen: add source files as dependenciesNeels Hofmeyr2019-02-041-7/+25
| | | | | | | | | | | | | | | | | So far, when modifying a source file, the doxygen docs were not regenerated automatically. It required a manual 'rm -rf docs/core' or similar. Make it rebuild automatically: Add each library's source files to the list of dependencies for the first-pass doxygen build. Attention, since all libraries depend on the .map files of each other library, and each library depends on its own source files, that means that a single touch on one .c file anywhere will result in rebuilding the entire doxygen docs. It is correct to do so, since any file may introduce \ref targets used anywhere else. If you don't want that, --disable-doxygen. Change-Id: I15ea96be6e7abe91264b91f0b06963a0f2d63b0b
* doxygen: enable cross referencing everywhereNeels Hofmeyr2019-02-048-28/+130
| | | | | | | | | | | | | | | | | | | | | | | | doxygen \ref cross-references to groups or files from other libraries only work when the .map file was present when the HTML was generated, and when that .map file was listed in TAGFILES in the Doxyfile. - Makefile.am: introduce a two-pass build for doxygen API docs. - First build pass makes sure the .tag files are present. - Second build pass picks up all the references, hence generates hyperlinks properly. - Add all libraries to TAGFILES of all other libraries, so we can from now on freely criss-cross reference from everywhere to everywhere. - Add all libraries' tag files as dependencies for all others. Example: in upcoming tdef.h, I would like to cross reference to tdef_vty.h, and vice versa, even though they are in libosmocore and libosmovty, respectively. This is now possible. We may still need to fix some problems with naming collisions, see for example stats.h, which exists twice with identical doxygen handle (different source dirs seems to not suffice for doxygen). Change-Id: Ib03d0b70d536c8f1386def666c89106a840f7363
* vty api: add vty_out_va()Neels Hofmeyr2019-02-042-12/+20
| | | | | | | | | Provide a va_list type vty_out() variant, to be able to pass on variable arguments from other function signatures to vty_out(). This will be used by Ibd6b1ed7f1bd6e1f2e0fde53352055a4468f23e5 for osmo_tdef. Change-Id: Ie6e6f11a6b794f3cb686350c1ed678e4d5bbbb75
* vty telnet: consistently never change nodes upon CTRL-CNeels Hofmeyr2019-02-041-18/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove any special node exiting from the VTY CTRL-C handling. From a curious VTY transcript test glitch, I noticed weird behavior by the VTY telnet shell: usually, when the user hits CTRL-C, that means to cancel the current command line and present a fresh, clean prompt. However, only on the CONFIG_NODE and CFG_LOG_NODE, a CTRL-C also exits the current node and moves up by one level. This behavior is unexplainable and makes zero sense. No other nodes exit on CTRL-C: - on the ENABLE node, a CTRL-C stays on the ENABLE_NODE and doesn't exit to the VIEW_NODE. - any sub-nodes of the CONFIG_NODE stay unchanged, e.g. 'network' or 'bts' / 'trx', etc. There is no apparent special meaning of CTRL-C on CONFIG_NODE nor CFG_LOG_NODE to justify this odd choice. Particularly, the vty transcript tests using osmo_verify_transcript_vty.py rely on sending CTRL-C to clear the command prompt, so that we can properly test sending '?' to the VTY during transcripts. In a live session, a '?' prints available options and then updates the prompt with identical command arguments. In a transcript test, that doesn't make sense, because each time the transcript writes out a new command to run. Consider e.g. a transcript test like: tdef_vty_test(config)# timer ? tea Tea time test Test timers software Typical software development cycle tdef_vty_test(config)# timer tea ? [TNNNN] T-number, optionally preceded by 't' or 'T'. To be able to issue a fresh command after '?', osmo_verify_transcript_vty.py explicitly sends a CTRL-C to clear the command buffer. Hence there we rely on predictable behavior of CTRL-C. More particularly, the upcoming osmo_tdef_vty transcript tests are apparently the first that want to test '?' behavior on the CONFIG_NODE's root level and fall on their face, because of the implicit exit that happens only there. Change-Id: I4f339ba61f1c273fa7da85caf77ba116ae2697b1
* vty: enable tab-completion for optional-multi-choice argsNeels Hofmeyr2019-02-041-1/+10
| | | | | | | | | | | | | | In cmd_complete_command_real(), detect and strip square braces from multi-choice arguments, to enable tab-completion for commands like > list cmd [(alpha|beta)] > cmd <TAB> alpha beta > cmd be<TAB> > cmd beta Change-Id: I8c304300b3633bb6e9b3457fcfa42121c8272ac0
* vty: enable optional-multi-choice syntax: [(one|two)]Neels Hofmeyr2019-02-043-3/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | Since very recently we sensibly handle commands like cmd ([one]|[two]|[three]) as optional multi-choice arguments. In addition, support the more obvious syntax of cmd [(one|two|three)] Internally, the tokens are mangled to [one] [two] and [three], which is how the rest of the code detects optional args, and makes sense in terms of UI: > cmd ? [one] [two] [three] (i.e. optional arguments are always shown in braces in '?' listings) Before this patch, commands defined with a syntax like [(one|two)], would lead to an assertion (shows as "multiple") during program startup. Change-Id: I952b3c00f97e2447f2308b0ec6f5f1714692b5b2
* vty: enable optional-multi-choice syntax: ([one]|[two])Neels Hofmeyr2019-02-042-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add basic optional multi-choice argument support. The VTY detects optional arguments by square braces. > cmd ? [optional-arg] > cmd optional-arg ok > cmd ok However, within multi-choice args, these braces were so far not treated as optional: > list cmd2 ([one]|[two]|[three]) > cmd2 % Command incomplete In preparation for I952b3c00f97e2447f2308b0ec6f5f1714692b5b2 which will enable the more obvious syntax of cmd [(one|two)] for reasons of internal implementation, first support a syntax of cmd ([one]|[two]) The internal vty implementation always needs square braces around each option. There is currently no good way to prevent developers from defining braces inside multi-arguments, so it is easiest to allow and handle them: > list cmd2 ([one]|[two]|[three]) > cmd2 ok The VTY doesn't guard against a mix like cmd (one|[two]) With this patch, a multi-choice command is treated as optional iff the first element is in square brackets. The remaining elements' square brackets have no effect besides confusing the user. This is not explicitly checked against. In general, I would prefer to check all of these details, but the current VTY code with its endless code duplication and obscure string mangling just doesn't provide that luxury. There are numerous worse errors hidden in there. Change-Id: I9a8474bd89ddc2155c58bfca7bd038d586aaa60a
* add generic vty_transcript_test.c, vty_transcript_test.vtyNeels Hofmeyr2019-02-043-2/+301
| | | | | | | | I want to tweak general VTY features and need to cover with a transcript test to show the differences. Start by showing the current situation of optional and multi-choice arguments. Change-Id: I5a79c83fabd02aba6406b6e0d620969c4bd0cc1d
* socket.h: add missing includeMax2019-02-041-2/+7
| | | | | | | | | | socket.h uses INET6_ADDRSTRLEN without including arpa/inet.h where it's defined which might break external users of socket.h Fix this by adding missing include. The error was introduced in 64b51eb68bd272b6b1f2cefa2b33e9dd74024d0c Change-Id: I2883addcb81cec038577e401e356e8f07a947d4c
* GSUP: deprecate osmo_gsup_get_err_msg_type()Oliver Smith2019-02-042-30/+17
| | | | | | | | | | | | | | Replace osmo_gsup_get_err_msg_type() with a wrapper to OSMO_GSUP_TO_MSGT_ERROR(). This macro assumes, that all error messages are (request message | 0x000001). Add a big comment header for osmo_gsup_message_type, describing this already implicitly followed rule and therefore making it explicit. With this change, we don't need to maintain the request -> error message mapping in osmo_gsup_get_err_msg_type() anymore. Related: Iec1b4ce4b7d8eb157406f006e1c4241e8fba2cd6 (osmo-gsm-manuals) Change-Id: I46d9f2327791978710e2f90b4d28a3761d723d8f
* osmo_fsm_inst_state_chg(): clamp timeout_secs to <= ~68 yearsNeels Hofmeyr2019-01-311-1/+13
| | | | | | | | | | | | | | | | | | | | During testing of the upcoming tdef API, it became apparent that passing very large timeout values to osmo_fsm_inst_state_chg() wraps back in the number range, and might actually result in effectively very short timeouts instead. Since time_t's range is not well defined across platforms, use a reasonable maximum value of signed 32 bit integer. Hence this will be safe at least on systems with an int32_t for struct timeval.tv_sec and larger. Clamp the osmo_fsm_inst_state_chg() timeout_secs argument to a maximum of 0x7fffffff, which amounts to just above 68 years: float(0x7fffffff) / (60. * 60 * 24 * 365.25) = 68.04965038532715 (In upcoming patch Ibd6b1ed7f1bd6e1f2e0fde53352055a4468f23e5, this can be verified to work by invoking tdef_test manually with a cmdline argument passed to enable the range check.) Change-Id: I35ec4654467b1d6040c8aa215049766089e5e64a
* osmo_fsm_inst_state_chg(): set T also for zero timeoutNeels Hofmeyr2019-01-294-7/+71
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before this patch, if timeout_secs == 0 was passed to osmo_fsm_inst_state_chg(), the previous T value remained set in the osmo_fsm_inst->T. For example: osmo_fsm_inst_state_chg(fi, ST_X, 23, 42); // timer == 23 seconds; fi->T == 42 osmo_fsm_inst_state_chg(fi, ST_Y, 0, 0); // no timer; fi->T == 42! Instead, always set to the T value passed to osmo_fsm_inst_state_chg(). Adjust osmo_fsm_inst_state_chg() API doc; need to rephrase to accurately describe the otherwise unchanged behaviour independently from T. Verify in fsm_test.c. Rationale: it is confusing to have a T number r