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diff --git a/tests/sys/netinet/Makefile b/tests/sys/netinet/Makefile
--- a/tests/sys/netinet/Makefile
+++ b/tests/sys/netinet/Makefile
@@ -5,7 +5,8 @@
TESTS_SUBDIRS+= libalias
-ATF_TESTS_C= fibs_multibind_test \
+ATF_TESTS_C= broadcast \
+ fibs_multibind_test \
ip_reass_test \
ip6_v4mapped_test \
so_reuseport_lb_test \
diff --git a/tests/sys/netinet/broadcast.c b/tests/sys/netinet/broadcast.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/netinet/broadcast.c
@@ -0,0 +1,192 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Gleb Smirnoff <glebius@FreeBSD.org>
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/param.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <ifaddrs.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+static const char buf[] = "Hello";
+
+/* Create a UDP socket with SO_BROADCAST set. */
+static int
+bcastsock(void)
+{
+ int s;
+
+ ATF_REQUIRE((s = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
+ ATF_REQUIRE(setsockopt(s, SOL_SOCKET, SO_BROADCAST, &(int){1},
+ sizeof(int)) == 0);
+ return (s);
+}
+
+/* Send on socket 's' with address 'to', confirm receive on 'r'. */
+static void
+bcastecho(int s, struct sockaddr_in *to, int r)
+{
+ char rbuf[sizeof(buf)];
+
+ printf("Sending to %s\n", inet_ntoa(to->sin_addr));
+ ATF_REQUIRE_MSG(sendto(s, buf, sizeof(buf), 0, (struct sockaddr *)to,
+ sizeof(*to)) == sizeof(buf), "sending of broadcast failed: %d",
+ errno);
+ ATF_REQUIRE(recv(r, rbuf, sizeof(rbuf), 0) == sizeof(rbuf));
+ ATF_REQUIRE_MSG(memcmp(buf, rbuf, sizeof(buf)) == 0,
+ "failed to receive own broadcast");
+}
+
+/* Find a first broadcast capable interface and copy its broadcast address. */
+static void
+firstbcast(struct in_addr *out)
+{
+ struct ifaddrs *ifa0, *ifa;
+ struct sockaddr_in sin;
+
+ ATF_REQUIRE(getifaddrs(&ifa0) == 0);
+ for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next)
+ if (ifa->ifa_addr->sa_family == AF_INET &&
+ (ifa->ifa_flags & IFF_BROADCAST))
+ break;
+ if (ifa == NULL) {
+ freeifaddrs(ifa0);
+ atf_tc_skip("No broadcast address found");
+ }
+ memcpy(&sin, ifa->ifa_broadaddr, sizeof(struct sockaddr_in));
+ *out = sin.sin_addr;
+ freeifaddrs(ifa0);
+}
+
+/* Application sends to INADDR_BROADCAST, and this goes on the wire. */
+ATF_TC_WITHOUT_HEAD(INADDR_BROADCAST);
+ATF_TC_BODY(INADDR_BROADCAST, tc)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_len = sizeof(struct sockaddr_in),
+ };
+ socklen_t slen = sizeof(sin);
+ int l, s;
+
+ l = bcastsock();
+ ATF_REQUIRE(bind(l, (struct sockaddr *)&sin, sizeof(sin)) == 0);
+ ATF_REQUIRE(getsockname(l, (struct sockaddr *)&sin, &slen) == 0);
+ sin.sin_addr.s_addr = htonl(INADDR_BROADCAST);
+
+ s = bcastsock();
+ bcastecho(s, &sin, l);
+
+ close(s);
+ close(l);
+}
+
+/*
+ * Application sends on broadcast address of an interface, INADDR_BROADCAST
+ * goes on the wire of the selected interface.
+ */
+ATF_TC_WITHOUT_HEAD(IP_ONESBCAST);
+ATF_TC_BODY(IP_ONESBCAST, tc)
+{
+ struct ifaddrs *ifa0, *ifa;
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_len = sizeof(struct sockaddr_in),
+ };
+ socklen_t slen = sizeof(sin);
+ int s, l;
+ in_port_t port;
+ bool skip = true;
+
+ s = bcastsock();
+ ATF_REQUIRE(setsockopt(s, IPPROTO_IP, IP_ONESBCAST, &(int){1},
+ sizeof(int)) == 0);
+
+ l = bcastsock();
+ ATF_REQUIRE(bind(l, (struct sockaddr *)&sin, sizeof(sin)) == 0);
+ ATF_REQUIRE(getsockname(l, (struct sockaddr *)&sin, &slen) == 0);
+ port = sin.sin_port;
+
+ ATF_REQUIRE(getifaddrs(&ifa0) == 0);
+ for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ continue;
+ if (!(ifa->ifa_flags & IFF_BROADCAST))
+ continue;
+ skip = false;
+ memcpy(&sin, ifa->ifa_broadaddr, sizeof(struct sockaddr_in));
+ sin.sin_port = port;
+ bcastecho(s, &sin, l);
+ }
+ freeifaddrs(ifa0);
+ close(s);
+ close(l);
+ if (skip)
+ atf_tc_skip("No broadcast address found");
+}
+
+/*
+ * Application sends on broadcast address of an interface, and this is what
+ * goes out the wire.
+ */
+ATF_TC_WITHOUT_HEAD(local_broadcast);
+ATF_TC_BODY(local_broadcast, tc)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_len = sizeof(struct sockaddr_in),
+ };
+ socklen_t slen = sizeof(sin);
+ int s, l;
+
+ s = bcastsock();
+ l = bcastsock();
+ ATF_REQUIRE(bind(l, (struct sockaddr *)&sin, sizeof(sin)) == 0);
+ ATF_REQUIRE(getsockname(l, (struct sockaddr *)&sin, &slen) == 0);
+ firstbcast(&sin.sin_addr);
+
+ bcastecho(s, &sin, l);
+
+ close(s);
+ close(l);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, INADDR_BROADCAST);
+ ATF_TP_ADD_TC(tp, IP_ONESBCAST);
+ ATF_TP_ADD_TC(tp, local_broadcast);
+
+ return (atf_no_error());
+}

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