osmo-sgsn - OsmoSGSN: Osmocom's Serving GPRS Support Node for 2G and 3G packet-switched mobile networks

Age	Commit message (Collapse)	Author	Files	Lines
2016-12-23	sndcp: Allow empty SNDCP-XID indications	Philipp	1	-18/+36
	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) Change-Id: I097a770cb4907418f53e620a051ebb8cd110c5f2 Related: OS#1794
2016-10-28	sndcp: Fixups for sndcp layer based on coverity-scan suggestions	Philipp	1	-12/+13
	- missing break in gprs_sndcp_pcomp.c, line 143 - string overflow in slhc_test.c, line 211 - sizeof mismatch in gprs_sndcp_xid.c, line 1369 and 1378 - mismatching signedness in gprs_sndcp_xid.c, line 1377 - needless < 0 comparison in gprs_sndcp_xid.c, line 477 - needless < 0 comparison in gprs_sndcp_xid.c, line 209 - missing returncode check in v42bis_test.c, line 320 - wrong pointer dereferentialization in gprs_sndcp_comp.c, line 73 Change-Id: I4f9adf251f5119e67ffe76baad6f1f996ac8dbad
2016-09-24	SNDCP: add SNDCP-XID encoder/decoder and unit test	Philipp	1	-0/+1803
	The SNDCP-XID (or layer-3 xid) is used to exchange layer-3 parameters such as compression. The encoder encodes a bytestream that is then sent as regular XID field from LLC. We will need the SNDCP-XID to negotiate the parameters for our upcomming GPRS data and header compression features Change-Id: If2d63fe2550864cafef3156b1dc0629037c49c1e