Add tests for TCP_MD5 getsockopt

Add tests for TCP_MD5 getsockopt for ipv6 and ipv4. These will only run
when the kernel module is loaded, but will be in place if further
regressions are found.

Reviewed by:	rscheff
MFC after:	3 days
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D35532

tests/sys/netinet/Makefile

@@ -10,7 +10,8 @@ TESTS_SUBDIRS+=	libalias
 ATF_TESTS_C=	ip_reass_test \
 		so_reuseport_lb_test \
 		socket_afinet \
-		tcp_connect_port_test
+		tcp_connect_port_test \
+		tcp_md5_getsockopt
 
 ATF_TESTS_SH=	carp fibs fibs_test redirect divert forward output lpm arp
 TEST_METADATA.output+=	required_programs="python"

tests/sys/netinet/tcp_md5_getsockopt.c

@@ -0,0 +1,135 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022, Klara Inc.
+ * Copyright (c) 2022, Claudio Jeker <claudio@openbsd.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/linker.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <err.h>
+
+#include <atf-c.h>
+
+void test_tcp_md5_getsockopt(int);
+
+void
+test_tcp_md5_getsockopt(int v6)
+{
+	if (kldfind("tcpmd5.ko") == -1)
+		atf_tc_skip("Test requires the tcpmd5 kernel module to be loaded");
+
+        struct sockaddr_in *s;
+        struct sockaddr_in6 s6 = { 0 };
+        struct sockaddr_in s4 = { 0 };
+        socklen_t len;
+        int csock, ssock, opt;
+	int pf;
+
+	if (v6) {
+		pf = PF_INET6;
+		len = sizeof(s6);
+
+		s6.sin6_family = pf;
+		s6.sin6_len = sizeof(s6);
+		s6.sin6_addr = in6addr_loopback;
+		s6.sin6_port = 0;
+
+		s = (struct sockaddr_in *)&s6;
+	} else {
+		pf = PF_INET;
+		len = sizeof(s4);
+
+		s4.sin_family = pf;
+		s4.sin_len = sizeof(s4);
+		s4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+		s4.sin_port = 0;
+
+		s = &s4;
+	}
+
+        if ((ssock = socket(pf, SOCK_STREAM, 0)) == -1)
+                atf_tc_fail("creating server socket");
+
+	fcntl(ssock, F_SETFL, O_NONBLOCK);
+
+	if ((bind(ssock, (struct sockaddr *)s, len) == -1))
+		atf_tc_fail("binding to localhost");
+
+	getsockname(ssock, (struct sockaddr *)s, &len);
+
+	listen(ssock, 1);
+
+        if ((csock = socket(pf, SOCK_STREAM, 0)) == -1)
+                atf_tc_fail("creating client socket");
+
+        if (connect(csock, (struct sockaddr *)s, len) == -1)
+                atf_tc_fail("connecting to server instance");
+
+        if (getsockopt(csock, IPPROTO_TCP, TCP_MD5SIG, &opt, &len) == -1)
+                atf_tc_fail("getsockopt");
+
+	close(csock);
+	close(ssock);
+
+	atf_tc_pass();
+}
+
+ATF_TC(tcp_md5_getsockopt_v4);
+ATF_TC_HEAD(tcp_md5_getsockopt_v4, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Test getsockopt for TCP MD5 SIG (IPv4)");
+}
+
+ATF_TC_BODY(tcp_md5_getsockopt_v4, tc)
+{
+	test_tcp_md5_getsockopt(0);
+}
+
+ATF_TC(tcp_md5_getsockopt_v6);
+ATF_TC_HEAD(tcp_md5_getsockopt_v6, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Test getsockopt for TCP MD5 SIG (IPv6)");
+}
+
+ATF_TC_BODY(tcp_md5_getsockopt_v6, tc)
+{
+	test_tcp_md5_getsockopt(1);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, tcp_md5_getsockopt_v4);
+	ATF_TP_ADD_TC(tp, tcp_md5_getsockopt_v6);
+
+	return atf_no_error();
+}