[PATCH] rsl: Implement handling of rsl Delete Ind message

[Ivan Kluchnikov]

If bsc receives Delete_Ind message from bts, bsc should release allocated 
channel, which was specified in dropped imm_assign message.
---
 openbsc/src/libbsc/abis_rsl.c |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/openbsc/src/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index f53ba84..ed6d8cd 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -1539,6 +1539,41 @@ static int rsl_rx_ccch_load(struct msgb *msg)
        return 0;
 }
 
+/* CCCH overloaded, IMM_ASSIGN was dropped */
+static int rsl_rx_delete_ind(struct gsm_bts_trx *trx, struct msgb *msg)
+{
+       struct abis_rsl_dchan_hdr *rqd_hdr = msgb_l2(msg);
+       struct gsm48_imm_ass *ia;
+       struct gsm_lchan *lchan;
+       struct gsm_bts_trx *cur_trx;
+       uint8_t chan_nr;
+       uint16_t arfcn;
+
+       /* bts didn't send IMM_ASSIGN, so we should release allocated channel */
+       if (msgb_l2len(msg) != MACBLOCK_SIZE + 6)
+               return -EIO;
+
+       ia = (struct gsm48_imm_ass *) (rqd_hdr->data + 2);
+
+       if (ia->msg_type == GSM48_MT_RR_IMM_ASS) {
+               chan_nr = ia->chan_desc.chan_nr;
+               arfcn = ia->chan_desc.h0.arfcn_high;
+               arfcn = (arfcn << 8) | ia->chan_desc.h0.arfcn_low;
+               llist_for_each_entry(cur_trx, &trx->bts->trx_list, list) {
+                       if (cur_trx->arfcn == arfcn) {
+                               lchan = lchan_lookup(cur_trx, chan_nr);
+                               if (!lchan)
+                                       return -EINVAL;
+                               if (lchan->state != LCHAN_S_ACTIVE)
+                                       return -EINVAL;
+                               rsl_direct_rf_release(lchan);
+                       }
+               }
+       }
+
+       return 0;
+}
+
 static int abis_rsl_rx_cchan(struct msgb *msg)
 {
        struct e1inp_sign_link *sign_link = msg->dst;
@@ -1558,6 +1593,8 @@ static int abis_rsl_rx_cchan(struct msgb *msg)
                break;
        case RSL_MT_DELETE_IND:
                /* CCCH overloaded, IMM_ASSIGN was dropped */
+               rc = rsl_rx_delete_ind(sign_link->trx, msg);
+               break;
        case RSL_MT_CBCH_LOAD_IND:
                /* current load on the CBCH */
                LOGP(DRSL, LOGL_NOTICE, "Unimplemented Abis RSL TRX message "
-- 
1.7.9.5