gtphub: add test for SGSN behind NAT
diff --git a/openbsc/tests/gtphub/gtphub_test.c b/openbsc/tests/gtphub/gtphub_test.c
index 4281303..bdce99d 100644
--- a/openbsc/tests/gtphub/gtphub_test.c
+++ b/openbsc/tests/gtphub/gtphub_test.c
@@ -1450,6 +1450,106 @@
OSMO_ASSERT(clear_test_hub());
}
+static void test_sgsn_behind_nat(void)
+{
+ LOG("test_user_data");
+
+ OSMO_ASSERT(setup_test_hub());
+ hub->sgsn_use_sender = 1; /* <-- Main difference to test_user_data() */
+ resolve_to_sgsn("192.168.42.23", 423); /* Same as sender */
+
+ OSMO_ASSERT(create_pdp_ctx());
+
+ /* now == 345; now + (6 * 60 * 60) == 21600 + 345 == 21945. */
+ OSMO_ASSERT(tunnels_are(
+ "192.168.42.23 (TEI C 321=1 / U 123=2)"
+ " <-> 192.168.43.34 (TEI C 765=3 / U 567=4)"
+ " @21945\n"));
+
+ LOG("- user data starts");
+ /* Now expect default port numbers for User plane -- except SGSN. */
+ resolve_to_ggsn("192.168.43.34", 2152);
+
+ /* 10 minutes later */
+ now += 600;
+
+ const char *u_from_ggsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr */
+ "ff" /* type 255: G-PDU */
+ "0058" /* length: 88 + 8 octets == 96 */
+ "00000002" /* mapped User TEI for SGSN from create_pdp_ctx() */
+ "0070" /* seq */
+ "0000" /* No extensions */
+ /* User data (ICMP packet), 96 - 12 = 84 octets */
+ "45000054daee40004001f7890a172a010a172a02080060d23f590071e3f8"
+ "4156000000007241010000000000101112131415161718191a1b1c1d1e1f"
+ "202122232425262728292a2b2c2d2e2f3031323334353637"
+ ;
+ const char *u_to_sgsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr */
+ "ff" /* type 255: G-PDU */
+ "0058" /* length: 88 + 8 octets == 96 */
+ "00000123" /* unmapped User TEI */
+ "6d31" /* new mapped seq */
+ "0000"
+ "45000054daee40004001f7890a172a010a172a02080060d23f590071e3f8"
+ "4156000000007241010000000000101112131415161718191a1b1c1d1e1f"
+ "202122232425262728292a2b2c2d2e2f3031323334353637"
+ ;
+
+ /* This depends on create_pdp_ctx() sending resolved_sgsn_addr as GSN
+ * Address IEs in the GGSN's Create PDP Ctx Response. */
+ OSMO_ASSERT(msg_from_ggsn_u(&ggsn_sender,
+ &resolved_sgsn_addr,
+ u_from_ggsn,
+ u_to_sgsn));
+
+ /* Make sure the user plane messages have refreshed the TEI mapping
+ * timeouts: 21945 + 600 == 22545. */
+ OSMO_ASSERT(tunnels_are(
+ "192.168.42.23 (TEI C 321=1 / U 123=2)"
+ " <-> 192.168.43.34 (TEI C 765=3 / U 567=4)"
+ " @22545\n"));
+
+ const char *u_from_sgsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr */
+ "ff" /* type 255: G-PDU */
+ "0058" /* length: 88 + 8 octets == 96 */
+ "00000004" /* mapped User TEI for GGSN from create_pdp_ctx() */
+ "1234" /* unknown seq */
+ "0000" /* No extensions */
+ /* User data (ICMP packet), 96 - 12 = 84 octets */
+ "45000054daee40004001f7890a172a010a172a02080060d23f590071e3f8"
+ "4156000000007241010000000000101112131415161718191a1b1c1d1e1f"
+ "202122232425262728292a2b2c2d2e2f3031323334353637"
+ ;
+ const char *u_to_ggsn =
+ "32" /* 0b001'1 0010: version 1, protocol GTP, with seq nr */
+ "ff" /* type 255: G-PDU */
+ "0058" /* length: 88 + 8 octets == 96 */
+ "00000567" /* unmapped User TEI */
+ "6d31" /* unmapped seq */
+ "0000"
+ "45000054daee40004001f7890a172a010a172a02080060d23f590071e3f8"
+ "4156000000007241010000000000101112131415161718191a1b1c1d1e1f"
+ "202122232425262728292a2b2c2d2e2f3031323334353637"
+ ;
+
+ OSMO_ASSERT(msg_from_sgsn_u(&sgsn_sender,
+ &resolved_ggsn_addr,
+ u_from_sgsn,
+ u_to_ggsn));
+
+ /* Make sure the user plane messages have refreshed the TEI mapping
+ * timeouts: 21945 + 600 == 22545. Both timeouts refreshed: */
+ OSMO_ASSERT(tunnels_are(
+ "192.168.42.23 (TEI C 321=1 / U 123=2)"
+ " <-> 192.168.43.34 (TEI C 765=3 / U 567=4)"
+ " @22545\n"));
+
+ OSMO_ASSERT(clear_test_hub());
+}
+
static struct log_info_cat gtphub_categories[] = {
[DGTPHUB] = {
@@ -1480,6 +1580,7 @@
test_reused_tei();
test_peer_restarted();
test_peer_restarted_reusing_tei();
+ test_sgsn_behind_nat();
printf("Done\n");
talloc_report_full(osmo_gtphub_ctx, stderr);