Add check of lifetime of LLC frame
If lifetime expires of queued LLC frames, they are discarded. The number
of discarded frames and the sum of their octets are reported to SGSN
via LLC-DISCARDED message.
The lifetime can be overridden via VTY. The value can be centi-seconds
or "infinite".
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp
index 945addc..217acdb 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -111,6 +111,21 @@
bitvec_read_field(block, rp, 4); // SMS Value
}
}
+ /* get lifetime */
+ uint16_t delay_csec = 0xffff;
+ if (TLVP_PRESENT(tp, BSSGP_IE_PDU_LIFETIME))
+ {
+ uint8_t lt_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME);
+ uint16_t *lt = (uint16_t *) TLVP_VAL(tp, BSSGP_IE_PDU_LIFETIME);
+ if (lt_len == 2)
+ delay_csec = ntohs(*lt);
+ else
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of "
+ "PDU_LIFETIME IE\n");
+ } else
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP missing mandatory "
+ "PDU_LIFETIME IE\n");
+
LOGP(DBSSGP, LOGL_INFO, "LLC [SGSN -> PCU] = TLLI: 0x%08x IMSI: %s len: %d\n", tlli, imsi, len);
/* check for existing TBF */
@@ -128,10 +143,28 @@
tbf_update(tbf);
gprs_rlcmac_trigger_downlink_assignment(tbf, 1, NULL);
} else {
- /* the TBF exists, so we must write it in the queue */
- struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue");
+ /* the TBF exists, so we must write it in the queue
+ * we prepend lifetime in front of PDU */
+ struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
+ struct timeval *tv;
+ struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv),
+ "llc_pdu_queue");
if (!llc_msg)
return -ENOMEM;
+ tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv));
+ if (bts->force_llc_lifetime)
+ delay_csec = bts->force_llc_lifetime;
+ /* keep timestap at 0 for infinite delay */
+ if (delay_csec != 0xffff) {
+ /* calculate timestamp of timeout */
+ gettimeofday(tv, NULL);
+ tv->tv_usec += (delay_csec % 100) * 10000;
+ tv->tv_sec += delay_csec / 100;
+ if (tv->tv_usec > 999999) {
+ tv->tv_usec -= 1000000;
+ tv->tv_sec++;
+ }
+ }
memcpy(msgb_put(llc_msg, len), data, len);
msgb_enqueue(&tbf->llc_queue, llc_msg);
/* set ms class for updating TBF */