[GPRS] Include IMSI and DRX params in BSSGP DL-UD
When we send a downlink unit-data request via BSSGP, there is a lot
of information that needs to be copied from the mm context, such as
the IMSI, DRX parametes, MS radio access parameters, ...
This is a quite strange layering violation, since we now need to pass
a pointer to the MM ctx from GMM through LLC into BSSGP :(
diff --git a/openbsc/src/gprs/gprs_bssgp.c b/openbsc/src/gprs/gprs_bssgp.c
index f3ce8a9..58ade4d 100644
--- a/openbsc/src/gprs/gprs_bssgp.c
+++ b/openbsc/src/gprs/gprs_bssgp.c
@@ -39,6 +39,7 @@
#include <openbsc/gprs_bssgp.h>
#include <openbsc/gprs_llc.h>
#include <openbsc/gprs_ns.h>
+#include <openbsc/gprs_sgsn.h>
void *bssgp_tall_ctx = NULL;
@@ -685,7 +686,7 @@
/* Entry function from upper level (LLC), asking us to transmit a BSSGP PDU
* to a remote MS (identified by TLLI) at a BTS identified by its BVCI and NSEI */
-int gprs_bssgp_tx_dl_ud(struct msgb *msg)
+int gprs_bssgp_tx_dl_ud(struct msgb *msg, struct sgsn_mm_ctx *mmctx)
{
struct bssgp_bvc_ctx *bctx;
struct bssgp_ud_hdr *budh;
@@ -696,6 +697,7 @@
uint16_t msg_len = msg->len;
uint16_t bvci = msgb_bvci(msg);
uint16_t nsei = msgb_nsei(msg);
+ uint16_t drx_params;
/* Identifiers from UP: TLLI, BVCI, NSEI (all in msgb->cb) */
if (bvci <= BVCI_PTM ) {
@@ -724,7 +726,37 @@
llc_pdu_tlv[1] |= 0x80;
}
- /* FIXME: optional elements */
+ /* FIXME: optional elements: Alignment, UTRAN CCO, LSA, PFI */
+
+ if (mmctx) {
+ /* Old TLLI to help BSS map from old->new */
+#if 0
+ if (mmctx->tlli_old)
+ msgb_tvlv_push(msg, BSSGP_IE_TLLI, 4, htonl(*tlli_old));
+#endif
+
+ /* IMSI */
+ if (strlen(mmctx->imsi)) {
+ uint8_t mi[10];
+ int imsi_len = gsm48_generate_mid_from_imsi(mi, mmctx->imsi);
+ if (imsi_len > 2)
+ msgb_tvlv_push(msg, BSSGP_IE_IMSI,
+ imsi_len-2, mi+2);
+ }
+
+ /* DRX parameters */
+ drx_params = htons(mmctx->drx_parms);
+ msgb_tvlv_push(msg, BSSGP_IE_DRX_PARAMS, 2,
+ (uint8_t *) &drx_params);
+
+ /* FIXME: Priority */
+
+ /* MS Radio Access Capability */
+ if (mmctx->ms_radio_access_capa.len)
+ msgb_tvlv_push(msg, BSSGP_IE_MS_RADIO_ACCESS_CAP,
+ mmctx->ms_radio_access_capa.len,
+ mmctx->ms_radio_access_capa.buf);
+ }
/* prepend the pdu lifetime */
pdu_lifetime = htons(pdu_lifetime);