Change in osmo-ggsn[master]: gtp: Add new API to avoid freeing pdp contexts during DEL CTX REQ

[Pau Espin Pedrol]

Hello Harald Welte, Jenkins Builder, 

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

    https://gerrit.osmocom.org/10006

to look at the new patch set (#2).

Change subject: gtp: Add new API to avoid freeing pdp contexts during DEL CTX REQ
......................................................................

gtp: Add new API to avoid freeing pdp contexts during DEL CTX REQ

With this API, user is expectd to free the PDP ctx when the confirmation
for the release has been received (cb_conf time). This way user can
maintain the pdp ctx alive during all this time. Extra code is added to
gtp_delete_pdp_resp() since it's now possible to match it and push it up
to the user cb_conf.

This way, cb_conf() can be used for locally-initiated DEL CTX REQ, while
delete_context() cb is left for remotely-initiated DEL CTX REQ. In this
later case, when the DEL CTX RESP is sent the ctx is deleted and the
delete_context() is called, where the user can do related actions or
trigger consequence events (in the case of SGSN, it will drop all
related GGSN bits for that PDP ctx and forward the DEACT PDP CTX to the
MS).

Change-Id: I29d366253bb98dcba328c7ce8aa3e4daf8f75e6c
---
M gtp/gtp.c
M gtp/gtp.h
2 files changed, 74 insertions(+), 38 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/06/10006/2
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Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I29d366253bb98dcba328c7ce8aa3e4daf8f75e6c
Gerrit-Change-Number: 10006
Gerrit-PatchSet: 2
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
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