[GPRS] SNDCP: Check if SN-PDU is too large and reject it
... since we don't do fragmentation yet
diff --git a/openbsc/src/gprs/gprs_sndcp.c b/openbsc/src/gprs/gprs_sndcp.c
index 6008025..72962dc 100644
--- a/openbsc/src/gprs/gprs_sndcp.c
+++ b/openbsc/src/gprs/gprs_sndcp.c
@@ -172,6 +172,7 @@
return 0;
}
+/* Request transmission of a SN-PDU over specified LLC Entity + SAPI */
int sndcp_unitdata_req(struct msgb *msg, struct gprs_llc_lle *lle, uint8_t nsapi,
void *mmcontext)
{
@@ -181,6 +182,13 @@
/* Identifiers from UP: (TLLI, SAPI) + (BVCI, NSEI) */
+ if (msg->len > lle->params.n201_u - (sizeof(*sch) + sizeof(*suh))) {
+ LOGP(DSNDCP, LOGL_ERROR, "Message length %u > N201-U (%u): "
+ "SNDCP Fragmentation not yet implemented\n",
+ msg->len, lle->params.n201_u);
+ return -EIO;
+ }
+
sne = sndcp_entity_by_lle(lle, nsapi);
if (!sne) {
LOGP(DSNDCP, LOGL_ERROR, "Cannot find SNDCP Entity\n");