Planning new connection-oriented RUA and SCCP FSMs to
- conquer confusion about hnbgw_context_map release behavior, and
- eradicate SCCP connection leaks.
Related: SYS#6297
Change-Id: I661bf65d79972a732c52732934095e8bfcd99694
Change the order in the struct definition so that the items for RUA and
for SCCP are grouped together. Tweak comments.
Change-Id: I84424617996d8e1a6814aa122e63454c0666b724
Instead of osmo_scu_prim_type, use RUA_ProcedureCode to tell
rua_to_scu() the RUA message type being handled.
Cosmetically prepare for upcoming patch that completely moves
osmo_scu_prim composition from rua_to_scu() to a new context map SCCP
FSM.
Related: I6ff7e36532ff57c6f2d3e7e419dd22ef27dafd19
Change-Id: I28735945844f732e7bd7f09db1f453c608415b84
From rua_to_scu(), drop dead code for connection-less messages. In fact,
rua_to_scu() is only used for connection-oriented messages. Clarify
that.
Change-Id: Id03c412cde066a6b2bbc26cb6b87053aa2408cba
Rename context_map_deactivate() to context_map_hnb_released().
This function is called only when the HNB is released / lost.
Change-Id: I6dcb26c94558fff28faf8f823e490967a9baf2ec
The SCCP CR payload length limit is now implemented in libosmo-sigtran
v1.7.0. The limit no longer needs to be enforced in osmo-hnbgw.
This reverts commit 2c91bd66a1,
except for keeping the cfg option, marked deprecated, and not doing
anything.
Fixes: OS#5906
Related: SYS#5968
Related: OS#5579
Depends: I174b2ce06a31daa5a129c8a39099fe8962092df8 (osmo-ttcn3-hacks)
Change-Id: I18dece84b33bbefce8617fbb0b2d79a7e5adb263
User reports show leaked UE contexts over time, in a scenario where HNB
regularly disconnect and reconnect.
So far, when we receive a HNB REGISTER REQ, we log as "duplicated" and
continue to use the hnb_context unchanged. But it seems obvious that a
HNB that registers does not expect any UE state to remain. It will
obviously not tear down UE contexts (HNBAP or RUA) that have been
established before the HNB REGISTER REQUEST. These hence remain in
osmo-hnbgw indefinitely.
When receiving a HNB REGISTER REQUEST, release all its previous UE
state. Allow the HNB to register with a clean slate.
The aim is to alleviate the observed build-up of apparently orphaned UE
contexts, in order to avoid gradual memory exhaustion.
Related: SYS#6297
Change-Id: I7fa8a04cc3b2dfba263bda5b410961c77fbed332
'map' is already guaranteed to be not NULL for that message type by the
preceding switch().
Related: CID#307434
Change-Id: Id30f459616391187aa2f8ad400c316e2144154c6
Clean up SCCP connections when a HNB disconnects.
When a HNB disconnects, we clean up all RUA <-> SCCP connection state
for that HNB. In that cleanup, discarding the SCCP connection is so far
missing.
Add a flag indicating true between SCCP CC and DISCONNECT. Hence we can
tell during context_map_deactivate() whether the cleanup is graceful
(DISCONNECT already sent) or non-graceful (need to DISCONNECT).
Change-Id: Icc2db9f6c0b2d0a814ff1110ffbe5e8f7f629222
Deallocate a recently allocated UE context if the UE REGISTER procedure
fails internally, in two places.
The UE REGISTER error is rather unlikely to happen in practice: it only
occurs when encoding the HNBAP response fails, which only gets checked
input and thus is unlikely to fail.
The same code paths also possibly leak asn1c allocations -- leave those
for another patch.
Related: SYS#6297
Change-Id: Icf4b82f9a904d56332c567f7ccfb24231ee66270
Fix leaked msgb introduced by the MGW support recently added, and from
there copied to the UPF support added after that.
Fixes leaked "RANAP Tx" msgb, one per RAB Assignment that involves an
MGW or UPF proxying of user data.
Related: SYS#6297
Change-Id: Ie30e880301346ffca72f98f8c467e56d622fb03f
bisect shows that the segfault was introduced by using the MGCP client
pool:
e62af4d46a is the first bad commit
Author: Pau Espin Pedrol <pespin@sysmocom.de>
Introduce support for libosmo-mgcp-client MGW pooling
Change-Id I371dc773b58788ee21037dc25d77f556c89c6b61
The segfault:
20230117224550365 DLMGCP DEBUG MGCP_CONN(to-HNB)[0x612000003ca0]{ST_CRCX_RESP}: Timeout of T1 (fsm.c:317)
[...]
20230117224550366 DLMGCP DEBUG mgw-endp(mgw-fsm-14429752-0)[0x612000003b20]{WAIT_MGW_RESPONSE}: Deallocated (fsm.c:568)
20230117224550366 DMGW DEBUG mgw(mgw-fsm-14429752-0)[0x612000003820]{MGW_ST_CRCX_HNB}: Received Event MGW_EV_MGCP_TERM (mgcp_client_endpoint_fsm.c:869)
=================================================================
==255699==ERROR: AddressSanitizer: heap-use-after-free on address 0x62b000000260 at pc 0x7f282a6ee143 bp 0x7fff0d9bcae0 sp 0x7fff0d9bcad8
READ of size 8 at 0x62b000000260 thread T0
#0 0x7f282a6ee142 in osmo_mgcpc_ep_client ../../../../src/osmo-mgw/src/libosmo-mgcp-client/mgcp_client_endpoint_fsm.c:223
#1 0x55e2a84f1889 in mgw_fsm_allstate_action ../../../../src/osmo-hnbgw/src/osmo-hnbgw/mgw_fsm.c:504
#2 0x7f2829d50c56 in _osmo_fsm_inst_dispatch ../../../src/libosmocore/src/fsm.c:863
#3 0x7f2829d55a08 in _osmo_fsm_inst_term ../../../src/libosmocore/src/fsm.c:962
#4 0x7f282a72679a in osmo_mgcpc_ep_fsm_check_state_chg_after_response ../../../../src/osmo-mgw/src/libosmo-mgcp-client/mgcp_client_endpoint_fsm.c:869
#5 0x7f282a6f1869 in on_failure ../../../../src/osmo-mgw/src/libosmo-mgcp-client/mgcp_client_endpoint_fsm.c:414
#6 0x7f282a727ac6 in osmo_mgcpc_ep_fsm_handle_ci_events ../../../../src/osmo-mgw/src/libosmo-mgcp-client/mgcp_client_endpoint_fsm.c:935
[...]
When a CRCX times out, MGCP_CONN fsm terminates (libosmo-mgcp-client).
In turn the parent mgw-endp fsm terminates (libosmo-mgcp-client).
This generates an MGW_EV_MGCP_TERM event to the mgw_fsm (osmo-ttcn3-hacks).
This attempts to retrieve a pointer from mgw_fsm state:
mgw_fsm_priv->mgcpc_ep->mgcp_client
where the middle one, mgcpc_ep, is the 'mgw-endp' that already deallocated above.
To fix, add to /osmo-hnbgw/mgw_fsm.c a separate pointer to the
mgcp_client, to call mgcp_client_pool_put() on it. Do not use mgcpc_ep
to get the mgcp_client, because mgcpc_ep deallocates independently.
Related: OS#5862
Change-Id: I460d7249f4fc7edcfd94f6084fc8f933b491520c
Looking at a customer's log, these error logs got my attention. There
seems to be no point in logging this at all.
Change-Id: I89dd4fb6913bfb84b6667b159e09968734e2102a
This fixes bug in use of M3UA/SCCP after 2**24 connection IDs have been
allocated.
Related: SYS#6211
Change-Id: I03bad960f65fbff6e467def5bba60fefb328f962
This way we document the recently gained support for MGW pooling.
Related: SYS#5987
Depends: osmo-gsm-manuals.git Change-Id Ieda0d4bfe6fc90da6e19c791d8ec2da89427ba3b
Change-Id: I3dc8a4b50f13ad50390ba82e64fe4ebe0b97d4e5
Large RAN installations may benefit from distributing the RTP voice
stream load over multiple media gateways.
libosmo-mgcp-client supports MGW pooling since version 1.8.0 (more than
one year ago). OsmoBSC has already been making use of it since then (see
osmo-bsc.git 8d22e6870637ed6d392a8a77aeaebc51b23a8a50); lets use this
feature in osmo-hngw too.
This commit is also part of a series of patches cleaning up
libosmo-mgcp-client and slowly getting rid of the old non-mgw-pooled VTY
configuration, in order to keep only 1 way to configure
libosmo-mgcp-client through VTY.
Related: SYS#5091
Related: SYS#5987
Change-Id: I371dc773b58788ee21037dc25d77f556c89c6b61
Otherwise the libosmo-netif stream API may continue accessing the conn
after returning if the socket has the WRITE flag active in the same main
loop iteration.
Change-Id: I628c59a88d94d299f432f405b37fbe602381d47e
It was seen on a real pcap trace (sctp & gsmtap_log) that the kernel
stack may decide to kill the connection (sending an ABORT) if it fails
to transmit some data after a while:
ABORT Cause code: "Protocol violation (0x000d)",
Cause Information: "Association exceeded its max_retrans count".
When this occurs, the kernel sends the
MSG_NOTIFICATION,SCTP_ASSOC_CHANGE,SCTP_COMM_LOST notification when
reading from the socket with sctp_recvmsg(). This basically signals that
the socket conn is dead, and subsequent writes to it will result in
send() failures (and receive SCTP_SEND_FAILED notification upon follow
up reads).
It's important to notice that after those events, there's no other sort
of different event like SHUTDOWN coming in, so that's the time at which
we must tell the user to close the socket.
Hence, let's signal the caller that the socket is dead by returning 0,
to comply with usual recv() API.
Related: SYS#6113
Change-Id: If35efd404405f926a4a6cc45862eeadd1b04e08c
SCTP_SHUTDOWN_EVENT is a first class event, and not a subtype of
SCTP_ASSOC_CHANGE (such as SCTP_SHUTDOWN_COMP).
Related: SYS#6113
Change-Id: I7fa648142c07f63c55091d2a15b9d7312bcd4cec
Under some circumstancies not yet fully known, which seems to
involve bad link quality and high latencies and some specific hNodeB
which reuse its local IP addr+port, it is seen that a 2nd SCTP
connection is created from the same HNB while locally we still keep the
old SCTP connection and its related hnb_context. Hence, when the hNodeB
tries to register again with this new conn, it is rejected all the time
by the HNBGW.
Related: SYS#6113
Change-Id: I33ae901cc37646eca90bf06953e44fcc25f4d6c6
As per what's indicated in 3GPP TS 25.469 8.2.4 Abnormal Conditions:
"""
If the HNB-GW receives a duplicate HNB REGISTER REQUEST (i.e. for an already registered HNB identified by the
unique HNB identity), then the new HNB REGISTER REQUEST shall override the existing registration and the
handling of the new HNB REGISTER REQUEST is according to section 8.2.
"""
Related: SYS#6113
Change-Id: I0250350a14a87498a2c68cd0c726ee2f1e72419d
Before handling of OSMO_STREAM_SCTP_MSG_FLAGS_NOTIFICATION in recent
commit (see Fixes: below), osmo_stream_srv_recv() and
internal _sctp_recvmsg_wrapper() in libosmo-netif would return either
-EAGAIN or 0 when an sctp notification was received from the kernel.
After adding handling of OSMO_STREAM_SCTP_MSG_FLAGS_NOTIFICATION, the
code paths for "rc == -EAGAIN" and "rc == 0" would not be executed
anymore since the first branch takes preference in the if-else
tree. For "rc == -EAGAIN" it's fine because the new branch superseeds
what's done on the "rc == -EAGAIN" branch. However, for the "rc == 0",
we forgot to actually destroy the connection. The "rc == 0" branch was
basically reached when SCTP_SHUTDOWN_EVENT was received because
osmo_stream_srv_recv() tried to resemble the interface of regular
recv(); let's hence check for that explicitly and destroy the conn
object (and the related hnb context in the process) when we receive
that event.
Fixes: 1de2091515
Related: SYS#6113
Change-Id: I11b6af51a58dc250975a696b98d0c0c9ff3df9e0
Sometimes an hNodeB may reconnect (SCTP INIT) using same SCTP tuple without
closing the previous conn. This is handled by the SCTP stack by means of
pushing a RESET notification up the stack to the sctp_recvmsg() user.
Let's handle this by marking the HNB as unregistered, since most
probably a HNB Register Req comes next as the upper layer state is
considered lost.
Depends: libosmo-netif.git Change-Id I0ee94846a15a23950b9d70eaaef1251267296bdd
Related: SYS#6113
Change-Id: Ib22881b1a34b1c3dd350912b3de8904917cf34ef
Otherwise, some paths calling hnb_context_release() (like failing to
transmit HNB-REGISTER-REJECT) would end up with a conn object alive with
no assigned hnb_context, which is something not wanted.
This way an alive conn object always has an associated hnb_context, and
they are only disassociated during synchronous release path.
Related: OS#5676
Change-Id: I44fea7ec74f14e0458861c92da4acf685ff695c1
Don't release the HNB context as there's plenty of code that
assumes there's always a HNB context associated with a SCTP connection.
Instead, simply unset the hnb_registered flag in the context when
processing a HNB_DE-REGISTER.
Related: OS#5676
Change-Id: Id5c4f5c900ea049f54afbf58edb84b4dc00b1dcb
It was observed that under some circumstances (after HNBAP
HNB-De-Register) we end up crashing because a connection has no HNB
assigned to it. Let's explicitly assert if that happens, in order
clarify and avoid same sort of thing happening without clear view on
what's going on.
The issue will be fixed in a follow-up patch.
Closes: OS#5676
Change-Id: I1eedab6f3ac974e942b02eaae41556f87dd8b6ba
By default systemd will execute service with root directory (or home directory for user instance) which might result in
attempts to create files in unexpected place. Let's set it to 'osmocom' subdir of state directory (/var/lib for system instance) instead.
Related: OS#4821
Change-Id: I3133dc7a687550901841755461db6020ee96d6b1
Tested in ttcn3, by test cases not ready for submission (would require
enabling/disabling PFCP while osmo-hnbgw is running).
ttcn3 tests in I511e758807e0512c18f3f9e0a8c4699b9a3f5992
Related: SYS#6093
Change-Id: I39b9632f8524a9f3455c1a2d7611bfe8ba07c2fd
Neels Hofmeyr
Pau Espin
arehbein
Harald Welte