Re-introduce support for IPA-encapsulated MGCP
Old osmo-bsc-sccplite already supported this, but in the migration
over to libosmo-sigtran and to real 3GPP AoIP, this functionality
got lost.
We now create a UDP proxy socket. Any MGCP commands received via IPA
from MSC (or rather: bsc_nat) are retransmitted to the MGW via UDP on
this socket. Any responses back from the MGW received on the UDP
socket are retransmitted back to MSC/bsc_nat as MGCP inside the IPA
multiplex.
Closes: OS#2536
Change-Id: I38ad8fa645c08900e0e1f1b4b96136bc6d96b3ab
diff --git a/include/osmocom/bsc/bsc_msc_data.h b/include/osmocom/bsc/bsc_msc_data.h
index 1f9872a..2ad7c68 100644
--- a/include/osmocom/bsc/bsc_msc_data.h
+++ b/include/osmocom/bsc/bsc_msc_data.h
@@ -33,6 +33,7 @@
#include "osmux.h"
#include <osmocom/core/timer.h>
+#include <osmocom/core/select.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
@@ -135,6 +136,16 @@
enum osmux_usage use_osmux;
/* Whether we detected the MSC supports Osmux (during BSSMAP_RESET) */
bool remote_supports_osmux;
+
+ /* Proxy between IPA/SCCPlite encapsulated MGCP and UDP */
+ struct {
+ /* local (BSC) IP address to be used */
+ char *local_addr;
+ /* local (BSC) UDP port to be used to talk with MGW */
+ uint16_t local_port;
+ /* UDP socket for proxying MGCP via SCCPlite/IPA */
+ struct osmo_fd ofd;
+ } mgcp_ipa;
};
/*