path: root/include/osmocom
diff options
authorHarald Welte <laforge@gnumonks.org>2018-05-26 22:56:59 +0200
committerlaforge <laforge@gnumonks.org>2019-06-18 18:09:26 +0000
commit1626f909461becfe1bb09707640ab23685b970dd (patch)
tree53813aaf3aef62737bb66bc25d97c14b48fecb56 /include/osmocom
parent062cd20993f6c6c0525c17cfe94b8721db79964d (diff)
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
Diffstat (limited to 'include/osmocom')
2 files changed, 20 insertions, 0 deletions
diff --git a/include/osmocom/bsc/bsc_msc_data.h b/include/osmocom/bsc/bsc_msc_data.h
index 1f9872a41..2ad7c685e 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 @@ struct bsc_msc_data {
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;
diff --git a/include/osmocom/bsc/osmo_bsc_sigtran.h b/include/osmocom/bsc/osmo_bsc_sigtran.h
index bd8b06398..b934d51d3 100644
--- a/include/osmocom/bsc/osmo_bsc_sigtran.h
+++ b/include/osmocom/bsc/osmo_bsc_sigtran.h
@@ -44,3 +44,12 @@ void osmo_bsc_sigtran_tx_reset_ack(const struct bsc_msc_data *msc);
/* receive + process a CTRL command from the piggy-back on the IPA/SCCPlite link */
int bsc_sccplite_rx_ctrl(struct osmo_ss7_asp *asp, struct msgb *msg);
+/* receive + process a MGCP message from the piggy-back on the IPA/SCCPlite link */
+int bsc_sccplite_rx_mgcp(struct osmo_ss7_asp *asp, struct msgb *msg);
+/* send a message via SCCPLite to given MSC */
+int bsc_sccplite_msc_send(struct bsc_msc_data *msc, struct msgb *msg);
+/* we received some data on the UDP proxy socket from the MGW. Pass it to MSC via IPA */
+int bsc_sccplite_mgcp_proxy_cb(struct osmo_fd *ofd, unsigned int what);