sk-tcp: Add test cases for TCP_CORK and TCP_NODELAY socket options

Currently there are no socket option test cases for TCP_CORK and
TCP_NODELAY, this commit adds related test cases.

The socket option test cases for TCP_KEEPCNT, TCP_KEEPIDLE, and
TCP_KEEPINTVL already exist in socket-tcp_keepalive.c, so they are
not included in this test case.

Signed-off-by: Juntong Deng <juntong.deng@outlook.com>

test/zdtm/static/Makefile

@@ -127,6 +127,8 @@ TST_NOFILE	:=				\
 		sock_opts02			\
 		sock_ip_opts00			\
 		sock_ip_opts01			\
+		sock_tcp_opts00			\
+		sock_tcp_opts01			\
 		sk-unix-unconn			\
 		sk-unix-unconn-seqpacket	\
 		ipc_namespace			\
@@ -609,6 +611,7 @@ socket-tcp6-closed:	CFLAGS += -D ZDTM_IPV4V6
 socket-tcp-closed-last-ack:	CFLAGS += -D ZDTM_TCP_LAST_ACK
 socket-tcp-skip-in-flight:	CFLAGS += -D ZDTM_IPV4V6
 sock_ip_opts01:		CFLAGS += -DZDTM_VAL_ZERO
+sock_tcp_opts01:	CFLAGS += -DZDTM_VAL_ZERO
 tun_ns:			CFLAGS += -DTUN_NS
 mnt_ext_manual:		CFLAGS += -D ZDTM_EXTMAP_MANUAL
 mntns_pivot_root_ro:	CFLAGS += -DMNTNS_PIVOT_ROOT_RO

test/zdtm/static/sock_tcp_opts00.c

@@ -0,0 +1,96 @@
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Check that different tcp socket options are restored";
+const char *test_author = "Juntong Deng <juntong.deng@outlook.com>";
+
+#ifdef ZDTM_VAL_ZERO
+#define TCP_OPT_VAL 0
+#else
+#define TCP_OPT_VAL 1
+#endif
+
+#ifndef SOL_TCP
+#define SOL_TCP 6
+#endif
+
+struct sk_opt {
+	int level;
+	int opt;
+	int val;
+};
+
+struct sk_opt tcp_sk_opts[] = {
+	{ SOL_TCP, TCP_CORK, TCP_OPT_VAL },
+	{ SOL_TCP, TCP_NODELAY, TCP_OPT_VAL },
+};
+
+struct sk_conf {
+	int domain;
+	int type;
+	int protocol;
+	int sk;
+} sk_confs[] = {
+	{ AF_INET, SOCK_STREAM, IPPROTO_TCP },
+	{ AF_INET6, SOCK_STREAM, IPPROTO_TCP },
+};
+
+int main(int argc, char **argv)
+{
+	struct sk_opt *opts = tcp_sk_opts;
+	int n_opts = ARRAY_SIZE(tcp_sk_opts);
+	int exit_code = 1;
+	int i, j, val;
+	socklen_t len;
+
+	test_init(argc, argv);
+
+	for (i = 0; i < ARRAY_SIZE(sk_confs); i++) {
+		sk_confs[i].sk = socket(sk_confs[i].domain, sk_confs[i].type, sk_confs[i].protocol);
+		if (sk_confs[i].sk == -1) {
+			pr_perror("socket(%d,%d,%d) failed", sk_confs[i].domain, sk_confs[i].type,
+				  sk_confs[i].protocol);
+			goto close;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(sk_confs); i++) {
+		for (j = 0; j < n_opts; j++) {
+			val = opts[j].val;
+			if (setsockopt(sk_confs[i].sk, opts[j].level, opts[j].opt, &val, sizeof(int)) == -1) {
+				pr_perror("setsockopt(%d, %d) failed", opts[j].level, opts[j].opt);
+				goto close;
+			}
+		}
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	for (i = 0; i < ARRAY_SIZE(sk_confs); i++) {
+		for (j = 0; j < n_opts; j++) {
+			len = sizeof(int);
+			if (getsockopt(sk_confs[i].sk, opts[j].level, opts[j].opt, &val, &len) == -1) {
+				pr_perror("getsockopt(%d, %d) failed", opts[j].level, opts[j].opt);
+				goto close;
+			}
+
+			if (val != opts[j].val) {
+				fail("Unexpected value socket(%d,%d,%d) opts(%d,%d)", sk_confs[i].domain,
+				     sk_confs[i].type, sk_confs[i].protocol, opts[j].level, opts[j].opt);
+				goto close;
+			}
+		}
+	}
+
+	pass();
+	exit_code = 0;
+close:
+	for (i = 0; i < ARRAY_SIZE(sk_confs); i++)
+		close(sk_confs[i].sk);
+	return exit_code;
+}

test/zdtm/static/sock_tcp_opts00.desc

@@ -0,0 +1 @@
+{'flags': 'suid'}

test/zdtm/static/sock_tcp_opts01.c

@@ -0,0 +1 @@
+./sock_tcp_opts00.c

test/zdtm/static/sock_tcp_opts01.desc

@@ -0,0 +1 @@
+./sock_tcp_opts00.desc