selftests/bpf: Use connect_to_addr in connect_to_fd_opt

This patch moves "post_socket_cb" and "noconnect" into connect_to_addr(),
then connect_to_fd_opts() can be implemented by getsockname() and
connect_to_addr(). This change makes connect_to_* interfaces more unified.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Link: https://lore.kernel.org/r/4569c30533e14c22fae6c05070aad809720551c1.1718932493.git.tanggeliang@kylinos.cnSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/network_helpers.c

@@ -293,9 +293,14 @@ int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t add
 	if (settimeo(fd, opts->timeout_ms))
 		goto error_close;
 
-	if (connect_fd_to_addr(fd, addr, addrlen, opts->must_fail))
+	if (opts->post_socket_cb &&
+	    opts->post_socket_cb(fd, opts->cb_opts))
 		goto error_close;
 
+	if (!opts->noconnect)
+		if (connect_fd_to_addr(fd, addr, addrlen, opts->must_fail))
+			goto error_close;
+
 	return fd;
 
 error_close:
@@ -306,9 +311,7 @@ int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t add
 int connect_to_fd_opts(int server_fd, int type, const struct network_helper_opts *opts)
 {
 	struct sockaddr_storage addr;
-	struct sockaddr_in *addr_in;
 	socklen_t addrlen;
-	int fd;
 
 	if (!opts)
 		opts = &default_opts;
@@ -319,29 +322,7 @@ int connect_to_fd_opts(int server_fd, int type, const struct network_helper_opts
 		return -1;
 	}
 
-	addr_in = (struct sockaddr_in *)&addr;
-	fd = socket(addr_in->sin_family, type, opts->proto);
-	if (fd < 0) {
-		log_err("Failed to create client socket");
-		return -1;
-	}
-
-	if (settimeo(fd, opts->timeout_ms))
-		goto error_close;
-
-	if (opts->post_socket_cb &&
-	    opts->post_socket_cb(fd, opts->cb_opts))
-		goto error_close;
-
-	if (!opts->noconnect)
-		if (connect_fd_to_addr(fd, &addr, addrlen, opts->must_fail))
-			goto error_close;
-
-	return fd;
-
-error_close:
-	save_errno_close(fd);
-	return -1;
+	return connect_to_addr(type, &addr, addrlen, opts);
 }
 
 int connect_to_fd(int server_fd, int timeout_ms)