libosmogsm: (re)introduce gsm48_push_l3hdr()
There was gsm0480_l3hdr_push() declared in a header file, but
not exposed in 'libosmogsm.map'. Furthermore, for some reason
it was a part of GSM 04.80 API, what is not actually correct.
Let's rename this symbol, and properly expose it as a part of
the GSM 04.08 API. Also, let's introduce an auxiliary wrapper
for messages, where the transaction identifier is required
(see GSM 04.07, section 11.2.3.1.2).
Change-Id: I8a045efe8335d83fcbe8d43eb180972e3b1d9dda
diff --git a/include/osmocom/gsm/gsm48.h b/include/osmocom/gsm/gsm48.h
index cfae83d..2b14e6c 100644
--- a/include/osmocom/gsm/gsm48.h
+++ b/include/osmocom/gsm/gsm48.h
@@ -4,6 +4,8 @@
#include <stdbool.h>
+#include <osmocom/core/msgb.h>
+
#include <osmocom/gsm/tlv.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/gsm48_ie.h>
@@ -63,3 +65,9 @@
OSMO_DEPRECATED("Use osmo_plmn_to_bcd() instead, to not lose leading zeros in the MNC");
void gsm48_mcc_mnc_from_bcd(uint8_t *bcd_src, uint16_t *mcc, uint16_t *mnc)
OSMO_DEPRECATED("Use osmo_plmn_from_bcd() instead, to not lose leading zeros in the MNC");
+
+struct gsm48_hdr *gsm48_push_l3hdr(struct msgb *msg,
+ uint8_t pdisc, uint8_t msg_type);
+
+#define gsm48_push_l3hdr_tid(msg, pdisc, tid, msg_type) \
+ gsm48_push_l3hdr(msg, (pdisc & 0x0f) | (tid << 4), msg_type)