Change in libosmo-netif[master]: prim: Add internal CTL SAPI to negotiate SAP versions

[pespin]

Hello Jenkins Builder, laforge, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/libosmo-netif/+/26435

to look at the new patch set (#6).

Change subject: prim: Add internal CTL SAPI to negotiate SAP versions
......................................................................

prim: Add internal CTL SAPI to negotiate SAP versions

This commits adds a generic mechansim for applications to validate
support for SAPs and specific versions of them.

A new special SAPI is introduced to manage inbound control messages for
the protocol.
In that SAPI a new primitive HELLO.ind/.cnf is added to negotiate
support for versions of any given SAP.
The idea is that the client upon connecting submits a HELLO.ind(SAP,
VER) for each SAP it plans to use, including the version of the special
CTL SAPI itself (preferrably to be checked first).
Upon receiving such a message, osmo_prim_srv handles it using a special
path, which ends up calling the user provided rx_sapi_version_cb(SAP,
VER). In there, the user can either:
* Accept the version (return same VER value)
* Reject the requested version but propose another candidate version
  (return some positive VER value other than received VER). In this
  case, the client can decide whether to request another VER or close the
  connection.
* Reject the proposed version and close the connection.

Change-Id: I0c2d92cfdb5433e3caab51d712fd947d51eeef23
---
M include/osmocom/netif/prim.h
M src/prim.c
2 files changed, 122 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmo-netif refs/changes/35/26435/6
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Gerrit-Project: libosmo-netif
Gerrit-Branch: master
Gerrit-Change-Id: I0c2d92cfdb5433e3caab51d712fd947d51eeef23
Gerrit-Change-Number: 26435
Gerrit-PatchSet: 6
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: newpatchset
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