Implement AoIP, port to M3UA SIGTRAN (large addition and refactoring)

This was originally a long series of commits converging to the final result
seen in this patch. It does not make much sense to review the smaller steps'
trial and error, we need to review this entire change as a whole.

Implement AoIP in osmo-msc and osmo-bsc.

Change over to the new libosmo-sigtran API with support for proper
SCCP/M3UA/SCTP stacking, as mandated by 3GPP specifications for the IuCS and
IuPS interfaces.

From here on, a separate osmo-stp process is required for SCCP routing between
OsmoBSC / OsmoHNBGW <-> OsmoMSC / OsmoSGSN

jenkins.sh: build from libosmo-sccp and osmo-iuh master branches now for new
M3UA SIGTRAN.

Patch-by: pmaier, nhofmeyr, laforge
Change-Id: I5ae4e05ee7c57cad341ea5e86af37c1f6b0ffa77

1 files changed, 94 insertions, 0 deletions

diff --git a/src/osmo-bsc/osmo_bsc_vty.c b/src/osmo-bsc/osmo_bsc_vty.c
index 2e2e99bfd..8edcbf390 100644
--- a/src/osmo-bsc/osmo_bsc_vty.c
+++ b/src/osmo-bsc/osmo_bsc_vty.c
@@ -28,6 +28,7 @@
 
 #include <osmocom/core/talloc.h>
 #include <osmocom/vty/logging.h>
+#include <osmocom/sccp/sccp_types.h>
 
 #include <time.h>
 
@@ -184,6 +185,16 @@ static void write_msc(struct vty *vty, struct bsc_msc_data *msc)
 
 	/* write amr options */
 	write_msc_amr_options(vty, msc);
+
+	/* write sccp connection configuration */
+	if (msc->a.bsc_addr_name) {
+		vty_out(vty, " bsc-addr %s%s",
+			msc->a.bsc_addr_name, VTY_NEWLINE);
+	}
+	if (msc->a.msc_addr_name) {
+		vty_out(vty, " msc-addr %s%s",
+			msc->a.msc_addr_name, VTY_NEWLINE);
+	}
 }
 
 static int config_write_msc(struct vty *vty)
@@ -685,6 +696,87 @@ DEFUN(cfg_msc_no_acc_lst_name,
 	return CMD_SUCCESS;
 }
 
+/* Make sure only standard SSN numbers are used. If no ssn number is
+ * configured, silently apply the default SSN */
+static void enforce_standard_ssn(struct vty *vty, struct osmo_sccp_addr *addr)
+{
+	if (addr->presence & OSMO_SCCP_ADDR_T_SSN) {
+		if (addr->ssn != SCCP_SSN_BSSAP)
+			vty_out(vty,
+				"setting an SSN (%u) different from the standard (%u) is not allowd, will use standard SSN for address: %s%s",
+				addr->ssn, SCCP_SSN_BSSAP, osmo_sccp_addr_dump(addr), VTY_NEWLINE);
+	}
+
+	addr->presence |= OSMO_SCCP_ADDR_T_SSN;
+	addr->ssn = SCCP_SSN_BSSAP;
+}
+
+DEFUN(cfg_msc_cs7_bsc_addr,
+      cfg_msc_cs7_bsc_addr_cmd,
+      "bsc-addr NAME",
+      "Calling Address (local address of this BSC)\n" "SCCP address name\n")
+{
+	struct bsc_msc_data *msc = bsc_msc_data(vty);
+	const char *bsc_addr_name = argv[0];
+	struct osmo_ss7_instance *ss7;
+
+	ss7 = osmo_sccp_addr_by_name(&msc->a.bsc_addr, bsc_addr_name);
+	if (!ss7) {
+		vty_out(vty, "No sccp address %s found%s", bsc_addr_name,
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Prevent mixing addresses from different CS7/SS7 instances */
+	if (msc->a.cs7_instance_valid) {
+		if (msc->a.cs7_instance != ss7->cfg.id) {
+			vty_out(vty,
+				"SCCP address %s from different CS7 instance%s",
+				bsc_addr_name, VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
+
+	msc->a.cs7_instance = ss7->cfg.id;
+	msc->a.cs7_instance_valid = true;
+	enforce_standard_ssn(vty, &msc->a.bsc_addr);
+	msc->a.bsc_addr_name = talloc_strdup(msc, bsc_addr_name);
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_msc_cs7_msc_addr,
+      cfg_msc_cs7_msc_addr_cmd,
+      "msc-addr NAME",
+      "Called Address (remote address of the MSC)\n" "SCCP address name\n")
+{
+	struct bsc_msc_data *msc = bsc_msc_data(vty);
+	const char *msc_addr_name = argv[0];
+	struct osmo_ss7_instance *ss7;
+
+	ss7 = osmo_sccp_addr_by_name(&msc->a.msc_addr, msc_addr_name);
+	if (!ss7) {
+		vty_out(vty, "No sccp address %s found%s", msc_addr_name,
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Prevent mixing addresses from different CS7/SS7 instances */
+	if (msc->a.cs7_instance_valid) {
+		if (msc->a.cs7_instance != ss7->cfg.id) {
+			vty_out(vty,
+				"SCCP address %s from different CS7 instance%s",
+				msc_addr_name, VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
+
+	msc->a.cs7_instance = ss7->cfg.id;
+	msc->a.cs7_instance_valid = true;
+	enforce_standard_ssn(vty, &msc->a.msc_addr);
+	msc->a.msc_addr_name = talloc_strdup(msc, msc_addr_name);
+	return CMD_SUCCESS;
+}
+
 DEFUN(cfg_net_bsc_mid_call_text,
       cfg_net_bsc_mid_call_text_cmd,
       "mid-call-text .TEXT",
@@ -931,6 +1023,8 @@ int bsc_vty_init_extra(void)
 	install_element(MSC_NODE, &cfg_net_msc_amr_4_75_cmd);
 	install_element(MSC_NODE, &cfg_msc_acc_lst_name_cmd);
 	install_element(MSC_NODE, &cfg_msc_no_acc_lst_name_cmd);
+	install_element(MSC_NODE, &cfg_msc_cs7_bsc_addr_cmd);
+	install_element(MSC_NODE, &cfg_msc_cs7_msc_addr_cmd);
 
 	install_element_ve(&show_statistics_cmd);
 	install_element_ve(&show_mscs_cmd);