Change in ...osmocom-bb[master]: mobile/gsm480_ss.c: gsm480_tx_release_compl(): fix cause IE encoding

[fixeria]

fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmocom-bb/+/14860


Change subject: mobile/gsm480_ss.c: gsm480_tx_release_compl(): fix cause IE encoding
......................................................................

mobile/gsm480_ss.c: gsm480_tx_release_compl(): fix cause IE encoding

According to GSM TS 04.08, section 10.5.4.11, location and coding
standard are encoded before the cause value, not vice-versa!

Also, coding standards other than "1 1 - Standard defined for the
GSM PLMNs" shall not be used if the cause can be represented with
the GSM standardized coding.

Change-Id: Ic6abcfb9a9589f5b0c9c40def863f15ae04d0bdd
---
M src/host/layer23/src/mobile/gsm480_ss.c
1 file changed, 7 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/60/14860/1

diff --git a/src/host/layer23/src/mobile/gsm480_ss.c b/src/host/layer23/src/mobile/gsm480_ss.c
index b114aa6..e462916 100644
--- a/src/host/layer23/src/mobile/gsm480_ss.c
+++ b/src/host/layer23/src/mobile/gsm480_ss.c
@@ -397,12 +397,17 @@
 	gh->proto_discr = GSM48_PDISC_NC_SS | (trans->transaction_id << 4);
 	gh->msg_type = GSM0480_MTYPE_RELEASE_COMPLETE;
 
+	/* GSM 04.08, section 10.5.4.11 */
 	if (cause) {
 		uint8_t *tlv = msgb_put(msg, 4);
 		tlv[0] = GSM48_IE_CAUSE;
 		tlv[1] = 2;
-		tlv[2] = 0x80 | cause;
-		tlv[3] = 0x80 | GSM48_CAUSE_LOC_USER;
+
+		/* Coding standard defined for the GSM PLMNs,
+		 * location - USER, cause as given by caller,
+		 * no extension, no diagnostics. */
+		cause_ie[2] = (1 << 7) | (0x03 << 5) | (GSM48_CAUSE_LOC_USER & 0x0f);
+		cause_ie[3] = (1 << 7) | cause;
 	}
 	return gsm480_to_mm(msg, trans, GSM48_MMSS_DATA_REQ);
 }

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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-Change-Id: Ic6abcfb9a9589f5b0c9c40def863f15ae04d0bdd
Gerrit-Change-Number: 14860
Gerrit-PatchSet: 1
Gerrit-Owner: fixeria <axilirator at gmail.com>
Gerrit-MessageType: newchange
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