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diff --git a/tests/sys/netgraph/Makefile b/tests/sys/netgraph/Makefile
--- a/tests/sys/netgraph/Makefile
+++ b/tests/sys/netgraph/Makefile
@@ -12,9 +12,11 @@
ATF_TESTS_C+= basic \
bridge \
+ hub \
SRCS.basic= basic.c util.c
SRCS.bridge= bridge.c util.c
+SRCS.hub= hub.c util.c
LIBADD+= netgraph
diff --git a/tests/sys/netgraph/hub.c b/tests/sys/netgraph/hub.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/netgraph/hub.c
@@ -0,0 +1,231 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright 2021 Lutz Donnerhacke
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <atf-c.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "util.h"
+
+ATF_TC(basic);
+ATF_TC_HEAD(basic, conf)
+{
+ atf_tc_set_md_var(conf, "require.user", "root");
+}
+
+ATF_TC_BODY(basic, dummy)
+{
+ char msg[] = "test";
+ ng_counter_t r;
+
+ ng_errors(PASS);
+ ng_shutdown("hub:");
+ ng_errors(FAIL);
+
+ ng_init();
+ ng_mkpeer(".", "a", "hub", "a");
+ ng_name("a", "hub");
+ ng_connect(".", "b", "hub:", "b");
+ ng_connect(".", "c", "hub:", "c");
+
+ /* do not bounce back */
+ ng_register_data("a", get_data0);
+ ng_counter_clear(r);
+ ng_send_data("a", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 0);
+
+ /* send to others */
+ ng_register_data("b", get_data0);
+ ng_register_data("c", get_data0);
+ ng_counter_clear(r);
+ ng_send_data("a", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 2);
+
+ ng_counter_clear(r);
+ ng_send_data("b", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 2);
+
+ ng_counter_clear(r);
+ ng_send_data("c", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 2);
+
+ /* remove a link */
+ ng_rmhook(".", "b");
+ ng_counter_clear(r);
+ ng_send_data("a", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 1);
+
+ ng_shutdown("hub:");
+}
+
+ATF_TC(persistence);
+ATF_TC_HEAD(persistence, conf)
+{
+ atf_tc_set_md_var(conf, "require.user", "root");
+}
+
+ATF_TC_BODY(persistence, dummy)
+{
+ ng_errors(PASS);
+ ng_shutdown("hub:");
+ ng_errors(FAIL);
+
+ ng_init();
+ ng_mkpeer(".", "a", "hub", "a");
+ ng_name("a", "hub");
+
+ ng_send_msg("hub:", "setpersistent");
+ ng_rmhook(".", "a");
+
+ ng_shutdown("hub:");
+}
+
+ATF_TC(loop);
+ATF_TC_HEAD(loop, conf)
+{
+ atf_tc_set_md_var(conf, "require.user", "root");
+}
+
+ATF_TC_BODY(loop, dummy)
+{
+ ng_counter_t r;
+ int i;
+ char msg[] = "LOOP Alert!";
+
+ ng_errors(PASS);
+ ng_shutdown("hub1:");
+ ng_shutdown("hub2:");
+ ng_errors(FAIL);
+
+ ng_init();
+ ng_mkpeer(".", "a", "hub", "a");
+ ng_name("a", "hub1");
+ ng_mkpeer(".", "b", "hub", "b");
+ ng_name("b", "hub2");
+
+ ng_register_data("a", get_data0);
+ ng_register_data("b", get_data0);
+
+ /*-
+ * Open loop
+ *
+ * /-- hub1
+ * . < |
+ * \-- hub2
+ */
+ ng_connect("hub1:", "xc1", "hub2:", "xc1");
+
+ ng_counter_clear(r);
+ ng_send_data("a", msg, sizeof(msg));
+ ng_handle_events(50, r);
+ ATF_CHECK(r[0] == 1);
+
+ /*-
+ * Closed loop, DANGEROUS!
+ *
+ * /-- hub1 -\
+ * . < | |
+ * \-- hub2 -/
+ */
+ ng_connect("hub1:", "xc2", "hub2:", "xc2");
+
+ ng_counter_clear(r);
+ ng_send_data("a", msg, sizeof(msg));
+ for (i = 0; i < 10; i++) /* don't run forever */
+ if (!ng_handle_event(50, r))
+ break;
+ ATF_CHECK(r[0] > 7);
+
+ ng_shutdown("hub1:");
+ ng_shutdown("hub2:");
+}
+
+ATF_TC(many_hooks);
+ATF_TC_HEAD(many_hooks, conf)
+{
+ atf_tc_set_md_var(conf, "require.user", "root");
+}
+
+ATF_TC_BODY(many_hooks, dummy)
+{
+ ng_counter_t r;
+ int i;
+ char msg[] = "test";
+ const int HOOKS = 1000;
+
+ ng_errors(PASS);
+ ng_shutdown("hub:");
+ ng_errors(FAIL);
+
+ ng_init();
+ ng_mkpeer(".", "a", "hub", "a");
+ ng_name("a", "hub");
+
+ ng_register_data("a", get_data0);
+ ng_counter_clear(r);
+ for (i = 0; i < HOOKS; i++)
+ {
+ char hook[20];
+
+ snprintf(hook, sizeof(hook), "hook%d", i);
+ ng_connect(".", hook, "hub:", hook);
+ ng_errors(PASS);
+ ng_send_data(hook, msg, sizeof(msg));
+ ng_errors(FAIL);
+ if (errno != 0)
+ break;
+ ng_handle_events(50, r);
+ }
+ ATF_CHECK(r[0] > 100);
+ atf_tc_expect_fail("Implementation limitation (%d)", i);
+ ATF_CHECK(r[0] == HOOKS);
+ atf_tc_expect_pass();
+
+ ng_shutdown("hub:");
+}
+
+
+ATF_TP_ADD_TCS(hub)
+{
+ ATF_TP_ADD_TC(hub, basic);
+ ATF_TP_ADD_TC(hub, loop);
+ ATF_TP_ADD_TC(hub, persistence);
+ ATF_TP_ADD_TC(hub, many_hooks);
+
+ return atf_no_error();
+}

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