gprs: Fix and check BVCI in BSSGP STATUS messages
Currently the BVCI is not set in all invocations to bssgp_tx_status()
when the cause is UNKNOWN_BVCI.
This patch adds the argument where it is missing.
It also adds a check for compliance (GSM 08.18, 10.4.14.1) to
bssgp_tx_status() to emit errors when the following requirement is
not fulfilled: The BVCI must be included if (and only if) the cause
is either "BVCI blocked" or "BVCI unknown".
Sponsored-by: On-Waves ehf
diff --git a/src/gb/gprs_bssgp_util.c b/src/gb/gprs_bssgp_util.c
index ae4647e..261e0b0 100644
--- a/src/gb/gprs_bssgp_util.c
+++ b/src/gb/gprs_bssgp_util.c
@@ -99,6 +99,20 @@
struct bssgp_normal_hdr *bgph =
(struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph));
+ /* GSM 08.18, 10.4.14.1: The BVCI must be included if (and only if) the
+ cause is either "BVCI blocked" or "BVCI unknown" */
+ if (cause == BSSGP_CAUSE_UNKNOWN_BVCI || cause == BSSGP_CAUSE_BVCI_BLOCKED) {
+ if (bvci == NULL)
+ LOGP(DBSSGP, LOGL_ERROR, "BSSGP Tx STATUS, cause=%s: "
+ "missing conditional BVCI\n",
+ bssgp_cause_str(cause));
+ } else {
+ if (bvci != NULL)
+ LOGP(DBSSGP, LOGL_ERROR, "BSSGP Tx STATUS, cause=%s: "
+ "unexpected conditional BVCI\n",
+ bssgp_cause_str(cause));
+ }
+
LOGP(DBSSGP, LOGL_NOTICE, "BSSGP BVCI=%u Tx STATUS, cause=%s\n",
bvci ? *bvci : 0, bssgp_cause_str(cause));
msgb_nsei(msg) = msgb_nsei(orig_msg);