Change in libosmocore[master]: lapdm: Allow SABM L=0 in Timer Recovery State

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pespin gerrit-no-reply at lists.osmocom.org
Wed Oct 21 11:33:56 UTC 2020


Hello Jenkins Builder, 

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

    https://gerrit.osmocom.org/c/libosmocore/+/20807

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

Change subject: lapdm: Allow SABM L=0 in Timer Recovery State
......................................................................

lapdm: Allow SABM L=0 in Timer Recovery State

3GPP TS 44.006 8.6.3 "Procedures for re-establishment" is quite
explicit:
"""
When the data link layer receives in the multiple frame established state
or !!!timer recovery state!!! a DL-ESTABLISH- REQUEST primitive from layer
3 or an SABM (with L=0), the normal establishment procedure of sub-clause
8.4.1.2 shall be initiated.
"""

If L>0 in that state, send a DM as stated in 8.4.1.2:
"""
If the data link layer entity is unable to enter the multiple-frame-established
state, it shall respond to the SABM command with a DM response with the F bit
set to the same binary value as the P bit in the received SABM command.
"""

Related: OS#4549
Related: OS#4819
Change-Id: I7959dc39f883cd5c56c36a21176a2401838d7b62
---
M src/gsm/lapd_core.c
1 file changed, 17 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/07/20807/2
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Change-Id: I7959dc39f883cd5c56c36a21176a2401838d7b62
Gerrit-Change-Number: 20807
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-CC: laforge <laforge at osmocom.org>
Gerrit-MessageType: newpatchset
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