Changes

m3ua: fix missing decoding of message priority & network indicator flag

The missing parenthesis always or'ed with a 0x0 into the sio field because
of operator precendence. Left shift is stronger than a binary and.

Related: SYS#8061
Change-Id: I7a07363646f66c5c672a2c0d261ca33356b43031

tcap_as_loadshare: Fix compare ignoring non-TCAP messages and remove assert

The previous check in asp_loadshare_tcap_sccp()  was was never true because it
checked msg class twice instead of class and type.

Also remove the OSMO_ASSERT in send_back_udts() limiting the function to
CL/DT messages.

Related: SYS#5432
Change-Id: I0831b289e4e4e94fd1b719e6c7164c3dd87c9f88

tcap_as_loadshare: Fix newline on log message

Change-Id: Iad85ec2d4e6a64d84a865c23eb00fddcb6d767c9

tcap loadsharing: tcap_as_rx_sccp_asp: Fix memory leak

Change-Id: Id0b21bffcad43d9999f7579d92e5ef2f4a0d9f1a

Add DSCP configuration support for server transport role

Introduce VTY command to configure the Differentiated Services Code
Point (DSCP) values for transport "role" server.

The configured DSCP value is applied to the listener socket. Incoming
socket connections will then automatically inherit these DSCP settings
from the listener socket.

It is not (yet) possible to configure DSCP values for individual active
server connections. The setting applies globally via the listener.
A later patch will allow DSCP configuration of each individual ASP.

Related: SYS#8071
Depends: libosmo-netif.git Change-Id Ic70422ec73c753b61843444582f8665ca42e7a6d
Change-Id: I35eab3672157c318616f51ee3042243aed263d4e

Add DSCP configuration support for each individual ASP

Introduce VTY command to configure the Differentiated Services Code
Point (DSCP) values for each Application Server Process.

If the ASP connection has the role "server", it will inherit the DSCP
settings of the listener, unless it is configured at the ASP connection.

Related: SYS#8071
Change-Id: Ia125a392eec5605553809774162675b5249b8494

tcap loadshare: allow to define the fallback mechanism for unroutable TCAP messages

When a TCAP Continue/End/Abort message is received, but no TCAP session entry can be found
and no valid TCAP range is available for the dtid, the message can be either:

- rejected by returning an error with udts
- routed by round robin to all available ASP of this AS

To define the behaviour, a new vty option is introduced:
```
   tcap-unroutable-sessions (reject-udts | load-share-over-as)
```
Defaults to reject-udts.

Related: SYS#5432
Change-Id: Ic1c876da30b05065a476d3a7c1bbf0680adf55bd

tcap loadshare: move last_asp_idx_sent from cfg to runtime struct

The last_asp_idx_sent is a runtime information and not configurable.
Move it to the other runtime state.

Change-Id: Id52bb0f6c67949b5e03f7ad36996f37a0d25214a

vty-tests: Re-introduce the check on the help

With the support of regex within vty tests,
the help message can be checked again.

Depends-on: Iadcd7a8c3677548a6405e098fe53d0614ef2012c (osmo-python-tests)
Change-Id: I3fad268b7a8925f378f6331fcab073637bd80e08

tcap loadshare: Rework initial selection of a node

The original TCAP loadshare plan was to used the OTID of a TCAP Begin to select
the node.
However this should not be used anymore. Instead the correct one would be to
do a load-sharing across all available ASP and keep this relation ("sticky" sessions).

The counter SS7_AS_CTR_TCAP_ASP_FALLBACK will be re-used by a later patch.

Related: SYS#5432
Change-Id: I151e6acb59e1f3c481487e76d2b01236fcee755f

tcap loadshare: count all ENOKEY as a FAILED

The ASP should count all message which couldn't routed as failed.

Related: SYS#5432
Change-Id: I8bee6db5c75195855a3d378579e30886cd4d6fa8

ss7_as: fix indention

Related: SYS#5432
Change-Id: Id006f4fcbf9ae6b5b50be3d41fb216c7f9bb2dfb

tcap loadshare: Add session miss counter

When a non-starting TCAP message (Continue, End, Abort) is received and
no session can be associated with it, count these as session miss.

Those should not appear under normal operation, except after a restart of osmo-stp.

Related: SYS#5432
Change-Id: I23319294e899e6acb6421d89675ce456048f7475

vty-tests: remove help from expected output

Until the vty tests support regex, remove the help message
as it depends on the compile option TCAP Routing and can't
handle both compile options.

It will be re-introduced later

Change-Id: I0d8141c00525f49c0a9f9f63b73fee531f591e5c

tcap_as_loadshare: improve logging of lookup failures

Change-Id: I80878dfd080c705de28175260cb392186dafed6a

tcap_as_loadshare: improve log lines

Change-Id: Idffe9a02127c587aca4123f12f74b657d6911a80