gprs: Don't discard SUSPEND/RESUME in bssgp_rcvmsg
Currently sending SUSPEND/RESUME messages to this function (like it
is done in the osmo-sgsn) results in STATUS messages complaining
about an unknown BVCI. The reason is, that these messages rely on a
TLLI/RAI pair to identify the context and do not contain an explicit
BVCI.
This patch modifies bssgp_rcvmsg() to only complain about and unknown
BVCI if one is given but a matching context is not found (except for
RESET messages). The ctx argument is removed from the functions
handling SUSPEND and RESUME since it will always be NULL then.
Sponsored-by: On-Waves ehf
diff --git a/src/gb/gprs_bssgp.c b/src/gb/gprs_bssgp.c
index 7a5d628..506efdf 100644
--- a/src/gb/gprs_bssgp.c
+++ b/src/gb/gprs_bssgp.c
@@ -398,32 +398,32 @@
return bssgp_prim_cb(&gbp.oph, NULL);
}
-static int bssgp_rx_suspend(struct msgb *msg, struct tlv_parsed *tp,
- struct bssgp_bvc_ctx *ctx)
+static int bssgp_rx_suspend(struct msgb *msg, struct tlv_parsed *tp)
{
struct osmo_bssgp_prim gbp;
struct gprs_ra_id raid;
uint32_t tlli;
+ uint16_t ns_bvci = msgb_bvci(msg);
int rc;
if (!TLVP_PRESENT(tp, BSSGP_IE_TLLI) ||
!TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) {
LOGP(DBSSGP, LOGL_ERROR, "BSSGP BVCI=%u Rx SUSPEND "
- "missing mandatory IE\n", ctx->bvci);
+ "missing mandatory IE\n", ns_bvci);
return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
}
tlli = ntohl(*(uint32_t *)TLVP_VAL(tp, BSSGP_IE_TLLI));
DEBUGP(DBSSGP, "BSSGP BVCI=%u TLLI=0x%08x Rx SUSPEND\n",
- ctx->bvci, tlli);
+ ns_bvci, tlli);
gsm48_parse_ra(&raid, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA));
/* Inform GMM about the SUSPEND request */
memset(&gbp, 0, sizeof(gbp));
gbp.nsei = msgb_nsei(msg);
- gbp.bvci = ctx->bvci;
+ gbp.bvci = ns_bvci;
gbp.tlli = tlli;
gbp.ra_id = &raid;
osmo_prim_init(&gbp.oph, SAP_BSSGP_GMM, PRIM_BSSGP_GMM_SUSPEND,
@@ -438,34 +438,34 @@
return 0;
}
-static int bssgp_rx_resume(struct msgb *msg, struct tlv_parsed *tp,
- struct bssgp_bvc_ctx *ctx)
+static int bssgp_rx_resume(struct msgb *msg, struct tlv_parsed *tp)
{
struct osmo_bssgp_prim gbp;
struct gprs_ra_id raid;
uint32_t tlli;
uint8_t suspend_ref;
+ uint16_t ns_bvci = msgb_bvci(msg);
int rc;
if (!TLVP_PRESENT(tp, BSSGP_IE_TLLI) ||
!TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA) ||
!TLVP_PRESENT(tp, BSSGP_IE_SUSPEND_REF_NR)) {
LOGP(DBSSGP, LOGL_ERROR, "BSSGP BVCI=%u Rx RESUME "
- "missing mandatory IE\n", ctx->bvci);
+ "missing mandatory IE\n", ns_bvci);
return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
}
tlli = ntohl(*(uint32_t *)TLVP_VAL(tp, BSSGP_IE_TLLI));
suspend_ref = *TLVP_VAL(tp, BSSGP_IE_SUSPEND_REF_NR);
- DEBUGP(DBSSGP, "BSSGP BVCI=%u TLLI=0x%08x Rx RESUME\n", ctx->bvci, tlli);
+ DEBUGP(DBSSGP, "BSSGP BVCI=%u TLLI=0x%08x Rx RESUME\n", ns_bvci, tlli);
gsm48_parse_ra(&raid, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA));
/* Inform GMM about the RESUME request */
memset(&gbp, 0, sizeof(gbp));
gbp.nsei = msgb_nsei(msg);
- gbp.bvci = ctx->bvci;
+ gbp.bvci = ns_bvci;
gbp.tlli = tlli;
gbp.ra_id = &raid;
gbp.u.resume.suspend_ref = suspend_ref;
@@ -886,23 +886,29 @@
uint8_t pdu_type = bgph->pdu_type;
int rc = 0;
uint16_t ns_bvci = msgb_bvci(msg);
+ uint16_t bvci = bctx ? bctx->bvci : ns_bvci;
switch (bgph->pdu_type) {
case BSSGP_PDUT_SUSPEND:
/* MS wants to suspend */
- rc = bssgp_rx_suspend(msg, tp, bctx);
+ rc = bssgp_rx_suspend(msg, tp);
break;
case BSSGP_PDUT_RESUME:
/* MS wants to resume */
- rc = bssgp_rx_resume(msg, tp, bctx);
+ rc = bssgp_rx_resume(msg, tp);
break;
case BSSGP_PDUT_FLUSH_LL_ACK:
/* BSS informs us it has performed LL FLUSH */
- DEBUGP(DBSSGP, "BSSGP Rx BVCI=%u FLUSH LL ACK\n", bctx->bvci);
+ DEBUGP(DBSSGP, "BSSGP Rx BVCI=%u FLUSH LL ACK\n", bvci);
/* FIXME: send NM_FLUSH_LL.res to NM */
break;
case BSSGP_PDUT_LLC_DISCARD:
/* BSS informs that some LLC PDU's have been discarded */
+ if (!bctx) {
+ LOGP(DBSSGP, LOGL_ERROR,
+ "BSSGP Rx LLC-DISCARD missing mandatory BVCI\n");
+ goto err_mand_ie;
+ }
rc = bssgp_rx_llc_disc(msg, tp, bctx);
break;
case BSSGP_PDUT_BVC_BLOCK:
@@ -936,7 +942,7 @@
break;
case BSSGP_PDUT_STATUS:
/* Some exception has occurred */
- DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx BVC STATUS\n", bctx->bvci);
+ DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx BVC STATUS\n", bvci);
/* FIXME: send NM_STATUS.ind to NM */
break;
/* those only exist in the SGSN -> BSS direction */
@@ -951,13 +957,13 @@
case BSSGP_PDUT_BVC_UNBLOCK_ACK:
case BSSGP_PDUT_SGSN_INVOKE_TRACE:
DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x only exists "
- "in DL\n", bctx->bvci, pdu_type);
+ "in DL\n", bvci, pdu_type);
bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
rc = -EINVAL;
break;
default:
DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n",
- bctx->bvci, pdu_type);
+ bvci, pdu_type);
rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
break;
}
@@ -998,8 +1004,10 @@
/* look-up or create the BTS context for this BVC */
bctx = btsctx_by_bvci_nsei(bvci, msgb_nsei(msg));
- /* Only a RESET PDU can create a new BVC context */
- if (!bctx && pdu_type != BSSGP_PDUT_BVC_RESET) {
+ /* Only a RESET PDU can create a new BVC context,
+ * otherwise it must be registered if a BVCI is given */
+ if (!bctx && bvci != BVCI_SIGNALLING &&
+ pdu_type != BSSGP_PDUT_BVC_RESET) {
LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU "
"type %u for unknown BVCI\n", msgb_nsei(msg), bvci,
pdu_type);