selftests/bpf: Drop type from network_helper_opts

The opts.{type, noconnect} is at least a bit non intuitive or unnecessary.
The only use case now is in test_bpf_ip_check_defrag_ok which ends up
bypassing most (or at least some) of the connect_to_fd_opts() logic. It's
much better that test should have its own connect_to_fd_opts() instead.

This patch adds a new "type" parameter for connect_to_fd_opts(), then
opts->type and getsockopt(SO_TYPE) can be replaced by "type" parameter in
it.

In connect_to_fd(), use getsockopt(SO_TYPE) to get "type" value and pass
it to connect_to_fd_opts().

In bpf_tcp_ca.c and cgroup_v1v2.c, "SOCK_STREAM" types are passed to
connect_to_fd_opts(), and in ip_check_defrag.c, different types "SOCK_RAW"
and "SOCK_DGRAM" are passed to it.

With these changes, the strcut member "type" of network_helper_opts can be
dropped now.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Link: https://lore.kernel.org/r/cfd20b5ad4085c1d1af5e79df3b09013a407199f.1718932493.git.tanggeliang@kylinos.cnSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/network_helpers.c

@@ -303,36 +303,16 @@ int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t add
 	return -1;
 }
 
-int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
+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, optlen;
-	int fd, type, protocol;
+	socklen_t addrlen;
+	int fd;
 
 	if (!opts)
 		opts = &default_opts;
 
-	optlen = sizeof(type);
-
-	if (opts->type) {
-		type = opts->type;
-	} else {
-		if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
-			log_err("getsockopt(SOL_TYPE)");
-			return -1;
-		}
-	}
-
-	if (opts->proto) {
-		protocol = opts->proto;
-	} else {
-		if (getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen)) {
-			log_err("getsockopt(SOL_PROTOCOL)");
-			return -1;
-		}
-	}
-
 	addrlen = sizeof(addr);
 	if (getsockname(server_fd, (struct sockaddr *)&addr, &addrlen)) {
 		log_err("Failed to get server addr");
@@ -340,7 +320,7 @@ int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
 	}
 
 	addr_in = (struct sockaddr_in *)&addr;
-	fd = socket(addr_in->sin_family, type, protocol);
+	fd = socket(addr_in->sin_family, type, opts->proto);
 	if (fd < 0) {
 		log_err("Failed to create client socket");
 		return -1;
@@ -369,8 +349,23 @@ int connect_to_fd(int server_fd, int timeout_ms)
 	struct network_helper_opts opts = {
 		.timeout_ms = timeout_ms,
 	};
+	int type, protocol;
+	socklen_t optlen;
+
+	optlen = sizeof(type);
+	if (getsockopt(server_fd, SOL_SOCKET, SO_TYPE, &type, &optlen)) {
+		log_err("getsockopt(SOL_TYPE)");
+		return -1;
+	}
+
+	optlen = sizeof(protocol);
+	if (getsockopt(server_fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &optlen)) {
+		log_err("getsockopt(SOL_PROTOCOL)");
+		return -1;
+	}
+	opts.proto = protocol;
 
-	return connect_to_fd_opts(server_fd, &opts);
+	return connect_to_fd_opts(server_fd, type, &opts);
 }
 
 int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)

tools/testing/selftests/bpf/network_helpers.h

@@ -25,7 +25,6 @@ struct network_helper_opts {
 	int timeout_ms;
 	bool must_fail;
 	bool noconnect;
-	int type;
 	int proto;
 	int (*post_socket_cb)(int fd, void *opts);
 	void *cb_opts;
@@ -61,7 +60,7 @@ void free_fds(int *fds, unsigned int nr_close_fds);
 int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t len,
 		    const struct network_helper_opts *opts);
 int connect_to_fd(int server_fd, int timeout_ms);
-int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
+int connect_to_fd_opts(int server_fd, int type, const struct network_helper_opts *opts);
 int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
 int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
 		     int timeout_ms);

tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c

@@ -49,7 +49,7 @@ static bool start_test(char *addr_str,
 		goto err;
 
 	/* connect to server */
-	*cli_fd = connect_to_fd_opts(*srv_fd, cli_opts);
+	*cli_fd = connect_to_fd_opts(*srv_fd, SOCK_STREAM, cli_opts);
 	if (!ASSERT_NEQ(*cli_fd, -1, "connect_to_fd_opts"))
 		goto err;
 

tools/testing/selftests/bpf/prog_tests/cgroup_v1v2.c

@@ -32,7 +32,7 @@ static int run_test(int cgroup_fd, int server_fd, bool classid)
 		goto out;
 	}
 
-	fd = connect_to_fd_opts(server_fd, &opts);
+	fd = connect_to_fd_opts(server_fd, SOCK_STREAM, &opts);
 	if (fd < 0)
 		err = -1;
 	else
@@ -52,7 +52,7 @@ void test_cgroup_v1v2(void)
 	server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
 	if (!ASSERT_GE(server_fd, 0, "server_fd"))
 		return;
-	client_fd = connect_to_fd_opts(server_fd, &opts);
+	client_fd = connect_to_fd_opts(server_fd, SOCK_STREAM, &opts);
 	if (!ASSERT_GE(client_fd, 0, "client_fd")) {
 		close(server_fd);
 		return;

tools/testing/selftests/bpf/prog_tests/ip_check_defrag.c

@@ -164,7 +164,6 @@ void test_bpf_ip_check_defrag_ok(bool ipv6)
 	};
 	struct network_helper_opts tx_ops = {
 		.timeout_ms = 1000,
-		.type = SOCK_RAW,
 		.proto = IPPROTO_RAW,
 		.noconnect = true,
 	};
@@ -201,7 +200,7 @@ void test_bpf_ip_check_defrag_ok(bool ipv6)
 	nstoken = open_netns(NS0);
 	if (!ASSERT_OK_PTR(nstoken, "setns ns0"))
 		goto out;
-	client_tx_fd = connect_to_fd_opts(srv_fd, &tx_ops);
+	client_tx_fd = connect_to_fd_opts(srv_fd, SOCK_RAW, &tx_ops);
 	close_netns(nstoken);
 	if (!ASSERT_GE(client_tx_fd, 0, "connect_to_fd_opts"))
 		goto out;
@@ -210,7 +209,7 @@ void test_bpf_ip_check_defrag_ok(bool ipv6)
 	nstoken = open_netns(NS0);
 	if (!ASSERT_OK_PTR(nstoken, "setns ns0"))
 		goto out;
-	client_rx_fd = connect_to_fd_opts(srv_fd, &rx_opts);
+	client_rx_fd = connect_to_fd_opts(srv_fd, SOCK_DGRAM, &rx_opts);
 	close_netns(nstoken);
 	if (!ASSERT_GE(client_rx_fd, 0, "connect_to_fd_opts"))
 		goto out;