Use 04.08 IMM ASS REJECT in case we run out of channels
If the user has a non-zero 'timer t3122' in the config file, we will
send an IMM ASS REJECT in case we run out of resources.
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index c076985..c27fff1 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -1152,6 +1152,45 @@
#define GSM48_LEN2PLEN(a) (((a) << 2) | 1)
+/* Format an IMM ASS REJ according to 04.08 Chapter 9.1.20 */
+static int rsl_send_imm_ass_rej(struct gsm_bts *bts,
+ unsigned int num_req_refs,
+ struct gsm48_req_ref *rqd_refs,
+ uint8_t wait_ind)
+{
+ uint8_t buf[GSM_MACBLOCK_LEN];
+ struct gsm48_imm_ass_rej *iar = (struct gsm48_imm_ass_rej *)buf;
+
+ /* create IMMEDIATE ASSIGN REJECT 04.08 message */
+ memset(iar, 0, sizeof(*iar));
+ iar->proto_discr = GSM48_PDISC_RR;
+ iar->msg_type = GSM48_MT_RR_IMM_ASS;
+ iar->page_mode = GSM48_PM_SAME;
+
+ memcpy(&iar->req_ref1, &rqd_refs[0], sizeof(iar->req_ref1));
+ iar->wait_ind1 = wait_ind;
+
+ if (num_req_refs >= 2)
+ memcpy(&iar->req_ref2, &rqd_refs[1], sizeof(iar->req_ref2));
+ else
+ memcpy(&iar->req_ref2, &rqd_refs[0], sizeof(iar->req_ref2));
+ iar->wait_ind2 = wait_ind;
+
+ if (num_req_refs >= 3)
+ memcpy(&iar->req_ref3, &rqd_refs[2], sizeof(iar->req_ref3));
+ else
+ memcpy(&iar->req_ref3, &rqd_refs[0], sizeof(iar->req_ref3));
+ iar->wait_ind3 = wait_ind;
+
+ if (num_req_refs >= 4)
+ memcpy(&iar->req_ref4, &rqd_refs[3], sizeof(iar->req_ref4));
+ else
+ memcpy(&iar->req_ref4, &rqd_refs[0], sizeof(iar->req_ref4));
+ iar->wait_ind4 = wait_ind;
+
+ return rsl_imm_assign_cmd(bts, sizeof(iar), (uint8_t *) iar);
+}
+
/* MS has requested a channel on the RACH */
static int rsl_rx_chan_rqd(struct msgb *msg)
{
@@ -1197,7 +1236,9 @@
LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s 0x%x\n",
msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), rqd_ref->ra);
counter_inc(bts->network->stats.chreq.no_channel);
- /* FIXME: send some kind of reject ?!? */
+ /* FIXME gather multiple CHAN RQD and reject up to 4 at the same time */
+ if (bts->network->T3122)
+ rsl_send_imm_ass_rej(bts, 1, rqd_ref, bts->network->T3122 & 0xff);
return -ENOMEM;
}