osmo-ns-dummy: Add "mirror-mode" to mirror back any received packets
Change-Id: If57bfdeb390d88d1ea058f7a9ce0403e64a5beda
diff --git a/utils/osmo-ns-dummy.c b/utils/osmo-ns-dummy.c
index 4b93788..ee7f591 100644
--- a/utils/osmo-ns-dummy.c
+++ b/utils/osmo-ns-dummy.c
@@ -28,6 +28,7 @@
static bool daemonize = false;
static int vty_port = 0;
static char *config_file = NULL;
+struct gprs_ns2_inst *g_nsi;
static const char vty_copyright[] =
"Copyright (C) 2020 by by sysmocom - s.f.m.c. GmbH\r\n"
@@ -185,9 +186,27 @@
}
}
+extern int g_mirror_mode;
+
/* called by the ns layer */
int gprs_ns_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
{
+ struct osmo_gprs_ns2_prim *nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph);
+
+ switch (oph->primitive) {
+ case GPRS_NS2_PRIM_UNIT_DATA:
+ if (g_mirror_mode) {
+ /* simply switch indication->request and resubmit */
+ oph->operation = PRIM_OP_REQUEST;
+ msgb_pull_to_l3(oph->msg);
+ nsp->u.unitdata.link_selector = rand(); /* ensure random distribution */
+ return gprs_ns2_recv_prim(g_nsi, oph);
+ }
+ break;
+ default:
+ break;
+ }
+
if (oph->msg)
msgb_free(oph->msg);
@@ -199,12 +218,11 @@
return 0;
}
-extern int nsdummy_vty_init(struct gprs_ns2_inst *nsi);
+extern int nsdummy_vty_init(void);
int main (int argc, char *argv[])
{
void *ctx = tall_nsdummy_ctx = talloc_named_const(NULL, 0, "osmo-ns-dummy");
- struct gprs_ns2_inst *nsi;
int rc = 0;
osmo_init_logging2(ctx, &log_info);
@@ -224,14 +242,14 @@
handle_options(argc, argv);
- nsi = gprs_ns2_instantiate(ctx, gprs_ns_prim_cb, NULL);
- if (!nsi) {
+ g_nsi = gprs_ns2_instantiate(ctx, gprs_ns_prim_cb, NULL);
+ if (!g_nsi) {
LOGP(DLNS, LOGL_ERROR, "Failed to create NS instance\n");
exit(1);
}
- gprs_ns2_vty_init(nsi);
- nsdummy_vty_init(nsi);
+ gprs_ns2_vty_init(g_nsi);
+ nsdummy_vty_init();
rc = vty_read_config_file(config_file, NULL);
if (rc < 0 && config_given) {
fprintf(stderr, "Failed to parse the config file: '%s'\n",
@@ -270,7 +288,7 @@
}
telnet_exit();
- gprs_ns2_free(nsi);
+ gprs_ns2_free(g_nsi);
talloc_report_full(tall_nsdummy_ctx, stderr);
talloc_free(tall_nsdummy_ctx);