nat: Handle CRCX/MDCX/DLCX at the nat
* Forward a rewritten msg to the BSS. We change the IP and port
to point to the NAT instead of the core network. We also keep
track of the BSC and the transacition id.
* Handle the case where we have not found a SCCP connection and
need to send a response ourselves.
diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index f1bb4b5..7effe48 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -26,6 +26,7 @@
#include <openbsc/gsm_data.h>
#include <openbsc/bssap.h>
#include <openbsc/debug.h>
+#include <openbsc/ipaccess.h>
#include <osmocore/linuxlist.h>
#include <osmocore/talloc.h>
@@ -122,4 +123,40 @@
}
return NULL;
-}
\ No newline at end of file
+}
+
+int bsc_write_mgcp(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length)
+{
+ struct msgb *msg;
+
+ if (length > 4096 - 128) {
+ LOGP(DINP, LOGL_ERROR, "Can not send message of that size.\n");
+ return -1;
+ }
+
+ msg = msgb_alloc_headroom(4096, 128, "to-bsc");
+ if (!msg) {
+ LOGP(DINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n");
+ return -1;
+ }
+
+ /* copy the data */
+ msg->l3h = msgb_put(msg, length);
+ memcpy(msg->l3h, data, length);
+
+ return bsc_write_mgcp_msg(bsc, msg);
+}
+
+int bsc_write_mgcp_msg(struct bsc_connection *bsc, struct msgb *msg)
+{
+ /* prepend the header */
+ ipaccess_prepend_header(msg, NAT_IPAC_PROTO_MGCP);
+
+ if (write_queue_enqueue(&bsc->write_queue, msg) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n");
+ msgb_free(msg);
+ return -1;
+ }
+
+ return 0;
+}