Add external dependency libnftables.
When an hNodeB registers, set up nftables rules to count GTP-U packets
(UDP port 2152) to and from that hNodeB's address -- we are assuming
that it is the same address that Iuh is connecting from.
This is a "workaround" to get performance indicators per hNodeB, without
needing a UPF that supports URR.
This patch reads counters from the nftables response using "manual"
string parsing. See also Id4e7fa017c31945388a010d8581715d71482116b which
modifies this to full JSON parsing.
Related: SYS#6773
Depends: libosmocore I0df84b4bb8cb5d8434b735fa3a38e7f95be43e91
Change-Id: I35b7e97fd039e36633dfde1317170527c82f9f68
I'm not sure why so many files (particularly written by Philipp)
did contain a GPLv2+ header, instead of the AGPLv3+ which is the
actual overall project license. I consider it a mistake.
In any case, any copyrightable contribution to those files was done by
sysmocom employees, so I as managing directory can legally make a
license change, whther or not it was a mistake early on or not.
Change-Id: I42ea544ae4e5c4d3bedad12ddb55cf3c26a30919
The actual scope is larger than just a stale release. Every RUA and SCCP
context map FSM state that has a timeout uses X31. (Seems I intended to
add more timers but forgot to follow up when I wrote it.)
Related: SYS#6602
Change-Id: I75a25f9065bc651e7ba8feda6db03c49a3b75c5e
It was spotted that in some deploys with satellite links and heavy load,
the roundtrip times for CR and CC can go slightly over 12 seconds, so
better increase the default value to 15 seconds to be on a safer place
and avoid operation problems with default configuration.
Related: SYS#6602, SYS#6616
Change-Id: I24225cfc0addf326c239ec658a27b93b83a3e751
Implement Paging record, remembering which CN link paged for which
mobile identity, for a set time period roundabout 15 seconds.
When receiving a Paging Response from a UE, connect it to the CN link
that sent the Paging.
Related: SYS#6412
Change-Id: I907dbcaeb442ca5630146f8cad40601c448fc40e
Implement cnlink FSM. This is a copy of osmo-bsc/bssmap_reset.c, except
for the connection success/failure counting.
The reason to exclude the CONN_CFM_FAILURE/_SUCCESS: it is a rather
experimental feature and should probably rather be covered by PCSTATE
notifications and protocol layer timeout tuning (e.g. SCCP ia timers).
Related: SYS#6412
Change-Id: Id3eefdea889a736fd5957b80280fa45b9547b792
Makes no sense to have groups with one member each.
Soon I will add a new timer that matches neither 'cmap' nor 'ps', and I
would have to open a third group with a single member.
Add a shim that redirects 'ps' to 'hnbgw'.
The group 'cmap' has not yet been released, so just drop that one
without a shim.
Change-Id: Ica6063fae4588b51897e5574d975b3185fa9ae80
Refactor the entire RUA <-> SCCP connection-oriented message forwarding:
- conquer confusion about hnbgw_context_map release behavior, and
- eradicate SCCP connection leaks.
Finer points:
== Context map state ==
So far, we had a single context map state and some flags to keep track
of both the RUA and the SCCP connections. It was easy to miss connection
cleanup steps, especially on the SCCP side.
Instead, the two FSMs clearly define the RUA and SCCP conn states
separately, and each side takes care of its own release needs for all
possible scenarios.
- When both RUA and SCCP are released, the context map is discarded.
- A context map can stay around to wait for proper SCCP release, even if
the RUA side has lost the HNB connection.
- Completely drop the async "context mapper garbage collection", because
the FSMs clarify the release and free steps, synchronously.
- We still keep a (simplified) enum for global context map state, but
this is only used so that VTY reporting remains mostly unchanged.
== Context map cleanup confusion ==
The function context_map_hnb_released() was the general cleanup function
for a context map. Instead, add separate context_map_free().
== Free context maps separately from HNB ==
When a HNB releases, talloc_steal() the context maps out of the HNB
specific hnb_ctx, so that they are not freed along with the HNB state,
possibly leaving SCCP connections afloat.
(It is still nice to normally keep context maps as talloc children of
their respective hnb_ctx, so talloc reports show which belongs to
which.)
So far, context map handling found the global hnb_gw pointer via
map->hnb_ctx->gw. But in fact, a HNB may disappear at any point in time.
Instead, use a separate hnb_gw pointer in map->gw.
== RUA procedure codes vs. SCCP prims ==
So far, the RUA rx side composed SCCP prims to pass on:
RUA rx ---SCCP-prim--> RANAP handling ---SCCP-prim--> SCCP tx
That is a source of confusion: a RUA procedure code should not translate
1:1 to SCCP prims, especially for RUA id-Disconnect (see release charts
below).
Instead, move SCCP prim composition over to the SCCP side, using FSM
events to forward:
RUA rx --event--> RUA FSM --event--> SCCP FSM --SCCP-prim--> SCCP tx
+RANAP +RANAP +RANAP
RUA tx <--RUA---- RUA FSM <--event-- SCCP FSM <--event-- SCCP rx
+RANAP +RANAP +RANAP
Hence choose the correct prim according to the SCCP FSM state.
- in hnbgw_rua.c, use RUA procedure codes, not prim types.
- via the new FSM events' data args, pass msgb containing RANAP PDUs.
== Fix SCCP Release behavior ==
So far, the normal conn release behavior was
HNB HNBGW CN
| --id-Disconnect--> | ---SCCP-Released--> | Iu-ReleaseComplete
| | <--SCCP-RLC-------- | (no data)
Instead, the SCCP release is now in accordance with 3GPP TS 48.006 9.2
'Connection release':
The MSC sends a SCCP released message. This message shall not contain
any user data field.
i.e.:
HNB HNBGW CN
| --id-Disconnect--> | ---Data-Form-1(!)--> | Iu-ReleaseComplete
| | <--SCCP-Released---- | (no data)
| | ---SCCP-RLC--------> | (no data)
(Side note, the final SCCP Release Confirm step is taken care of
implicitly by libosmo-sigtran's sccp_scoc.c FSM.)
If the CN fails to respond with SCCP-Released, on new X31 timeout,
osmo-hnbgw will send an SCCP Released to the CN as fallback.
== Memory model for message dispatch ==
So far, an osmo_scu_prim aka "oph" was passed between RUA and SCCP
handling code, and the final dispatch freed it. Every error path had to
take care not to leak any oph.
Instead, use a much easier and much more leakage proof memory model,
inspired by fixeria:
- on rx, dispatch RANAP msgb that live in OTC_SELECT.
- no code path needs to msgb_free() -- the msgb is discarded via
OTC_SELECT when handling is done, error or no error.
- any code path may also choose to store the msgb for async dispatch,
using talloc_steal(). The user plane mapping via MGW and UPF do that.
- if any code path does msgb_free(), that would be no problem either
(but none do so now, for simplicity).
== Layer separation ==
Dispatch *all* connection-oriented RUA tx via the RUA FSM and SCCP tx
via the SCCP FSM, do not call rua_tx_dt() or osmo_sccp_user_sap_down()
directly.
== Memory model for decoded ranap_message IEs ==
Use a talloc destructor to make sure that the ranap_message IEs are
always implicitly freed upon talloc_free(), so that no code path can
possibly forget to do so.
== Implicit cleanup by talloc ==
Use talloc scoping to remove a bunch of explicit cleanup code. For
example, make a chached message a talloc child of its handler:
talloc_steal(mgw_fsm_priv, message);
mgw_fsm_priv->ranap_rab_ass_req_message = message;
and later implicitly free 'message' by only freeing the handler:
talloc_free(mgw_fsm_priv)
Related: SYS#6297
Change-Id: I6ff7e36532ff57c6f2d3e7e419dd22ef27dafd19
For the tdefs used by libosmo-mgcp-client, passed via
osmo_mgcpc_ep_alloc(), do not use the separate mgw_tdefs. Instead, move
X2427 to mgw_fsm_T_defs. This makes X2427 VTY configurable.
Related: SYS#5895
Change-Id: I2aa67121c20dc3da5fd937a02b6747468622f317
osmo-hnbgw lacks support for an co-located media gateway. This makes it
virtually impossible to isolate the HNB from the core network properly.
Lets add MGCP support to osmo-hnbgw so that it can control a co-located
media gateway to relay the RTP streams between HNB and core network.
Change-Id: Ib9b62e0145184b91c56ce5d8870760bfa49cc5a4
Related: OS#5152
Neels Hofmeyr
Harald Welte
Pau Espin
Neels Hofmeyr
Philipp Maier