[PATCH bpf-next v10 11/12] selftests/bpf: Use connect_to_addr in sk_lookup

[Geliang Tang <geliang@xxxxxxxxxx>]

From: Geliang Tang <tanggeliang@xxxxxxxxxx>

Add a new parameter expect_errno for make_client(), and use public network
helpers make_sockaddr() + connect_to_addr() in it instead of using local
defined function make_socket() + connect(). This local function can be
dropped latter.

A new parameter "expect_errno" is added for make_client() too to allow
different "expect_errno" is passed to make_client() and set as
"opts->expect_errno", then passed this opts to connect_to_addr().

connect_to_addr() returns normal "fd" instead of "-1" when connect() fails
but "expect_errno" matched. So "err = -errno" are needed to get the real
error numbers before checking values of "err" in both drop_on_lookup() and
drop_on_reuseport().

Signed-off-by: Geliang Tang <tanggeliang@xxxxxxxxxx>
---
 .../selftests/bpf/prog_tests/sk_lookup.c      | 46 +++++++++----------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index 184b838a9872..5e013e0f8136 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -229,25 +229,27 @@ static int make_server(int sotype, const char *ip, int port,
 	return -1;
 }
 
-static int make_client(int sotype, const char *ip, int port)
+static int make_client(int sotype, const char *ip, int port,
+		       const int expect_errno)
 {
-	struct sockaddr_storage addr = {0};
+	int family = is_ipv6(ip) ? AF_INET6 : AF_INET;
+	struct network_helper_opts opts = {
+		.timeout_ms	= IO_TIMEOUT_SEC,
+		.expect_errno	= expect_errno,
+	};
+	struct sockaddr_storage addr;
+	socklen_t len;
 	int err, fd;
 
-	fd = make_socket(sotype, ip, port, &addr);
-	if (fd < 0)
+	err = make_sockaddr(family, ip, port, &addr, &len);
+	if (!ASSERT_OK(err, "make_sockaddr"))
 		return -1;
 
-	err = connect(fd, (void *)&addr, inetaddr_len(&addr));
-	if (CHECK(err, "make_client", "connect")) {
-		log_err("failed to connect client socket");
-		goto fail;
-	}
+	fd = connect_to_addr(sotype, &addr, len, &opts);
+	if (!ASSERT_GE(fd, 0, "connect_to_addr"))
+		return -1;
 
 	return fd;
-fail:
-	close(fd);
-	return -1;
 }
 
 static __u64 socket_cookie(int fd)
@@ -651,7 +653,7 @@ static void run_lookup_prog(const struct test *t)
 			goto close;
 	}
 
-	client_fd = make_client(t->sotype, t->connect_to.ip, t->connect_to.port);
+	client_fd = make_client(t->sotype, t->connect_to.ip, t->connect_to.port, 0);
 	if (client_fd < 0)
 		goto close;
 
@@ -867,7 +869,6 @@ static void test_redirect_lookup(struct test_sk_lookup *skel)
 
 static void drop_on_lookup(const struct test *t)
 {
-	struct sockaddr_storage dst = {};
 	int client_fd, server_fd, err;
 	struct bpf_link *lookup_link;
 	ssize_t n;
@@ -881,12 +882,12 @@ static void drop_on_lookup(const struct test *t)
 	if (server_fd < 0)
 		goto detach;
 
-	client_fd = make_socket(t->sotype, t->connect_to.ip,
-				t->connect_to.port, &dst);
+	client_fd = make_client(t->sotype, t->connect_to.ip,
+				t->connect_to.port, ECONNREFUSED);
 	if (client_fd < 0)
 		goto close_srv;
 
-	err = connect(client_fd, (void *)&dst, inetaddr_len(&dst));
+	err = -errno;
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client_fd);
 		if (err)
@@ -981,7 +982,6 @@ static void test_drop_on_lookup(struct test_sk_lookup *skel)
 
 static void drop_on_reuseport(const struct test *t)
 {
-	struct sockaddr_storage dst = { 0 };
 	int client, server1, server2, err;
 	struct bpf_link *lookup_link;
 	ssize_t n;
@@ -1005,12 +1005,12 @@ static void drop_on_reuseport(const struct test *t)
 	if (server2 < 0)
 		goto close_srv1;
 
-	client = make_socket(t->sotype, t->connect_to.ip,
-			     t->connect_to.port, &dst);
+	client = make_client(t->sotype, t->connect_to.ip,
+			     t->connect_to.port, ECONNREFUSED);
 	if (client < 0)
 		goto close_srv2;
 
-	err = connect(client, (void *)&dst, inetaddr_len(&dst));
+	err = -errno;
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client);
 		if (err)
@@ -1157,7 +1157,7 @@ static void run_sk_assign_connected(struct test_sk_lookup *skel,
 	if (server_fd < 0)
 		return;
 
-	connected_fd = make_client(sotype, EXT_IP4, EXT_PORT);
+	connected_fd = make_client(sotype, EXT_IP4, EXT_PORT, 0);
 	if (connected_fd < 0)
 		goto out_close_server;
 
@@ -1171,7 +1171,7 @@ static void run_sk_assign_connected(struct test_sk_lookup *skel,
 		goto out_close_connected;
 
 	/* Try to redirect TCP SYN / UDP packet to a connected socket */
-	client_fd = make_client(sotype, EXT_IP4, EXT_PORT);
+	client_fd = make_client(sotype, EXT_IP4, EXT_PORT, 0);
 	if (client_fd < 0)
 		goto out_unlink_prog;
 	if (sotype == SOCK_DGRAM) {
-- 
2.43.0