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commit b0a32e58d11f7dd79272a178eef838980b980d41 Author: Philipp pmaier@sysmocom.de Date: Fri Dec 16 16:03:28 2016 +0100
sndcp: Allow empty SNDCP-XID indications
In some rare cases the modem might send a xid indication that does not contain anything except the version number field. The sgsn ignors such SNDCP-XID indications by stripping the entire field from the response. We found a modem in the wild that started to act problematic when the empty SNDCP-XID was missing in the response. This patch changes the XID negotiation behaviour in a way that if a modem should send empty SNDCP-XID indications, the reply will also contain an empty SNDCP-XID indication. Apart from that the SNDCP-XID version number is now parsed and echoed in the response. This ensures that we always reply with the version number that the modem expects. (The version was 0 in all cases we observed so far)
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Summary of changes: openbsc/include/openbsc/gprs_sndcp_xid.h | 14 +++++---- openbsc/src/gprs/gprs_llc.c | 14 ++++----- openbsc/src/gprs/gprs_sndcp.c | 25 +++++++-------- openbsc/src/gprs/gprs_sndcp_xid.c | 54 +++++++++++++++++++++----------- openbsc/tests/sndcp_xid/sndcp_xid_test.c | 10 +++--- 5 files changed, 68 insertions(+), 49 deletions(-)
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