[gprs] pass BSSGP UL-UNITDATA Cell ID up into GMM layer
BSSGP stores a pointer to the Cell Identifier IE in msgb->cb, which
is later used by the GMM layer to identify the cell that has sent a
given message.
This now also means that the gsm_04_08_gprs.c code is free of any
legacy references to msg->trx or struct gsm_bts.
diff --git a/openbsc/include/openbsc/gprs_bssgp.h b/openbsc/include/openbsc/gprs_bssgp.h
index c70868a..c1094b3 100644
--- a/openbsc/include/openbsc/gprs_bssgp.h
+++ b/openbsc/include/openbsc/gprs_bssgp.h
@@ -140,6 +140,7 @@
#include <osmocore/tlv.h>
extern int gprs_bssgp_rcvmsg(struct msgb *msg);
+uint16_t bssgp_parse_cell_id(struct gprs_ra_id *raid, const uint8_t *buf);
/* Wrapper around TLV parser to parse BSSGP IEs */
static inline int bssgp_tlv_parse(struct tlv_parsed *tp, uint8_t *buf, int len)