selftests: bpf: Don't listen() on UDP sockets

Most tests for TCP sockmap can be adapted to UDP sockmap if the
listen call is skipped. Rename listen_loopback, etc. to socket_loopback
and skip listen() for SOCK_DGRAM.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200309111243.6982-10-lmb@cloudflare.com

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

@@ -230,7 +230,7 @@ static int enable_reuseport(int s, int progfd)
 	return 0;
 }
 
-static int listen_loopback_reuseport(int family, int sotype, int progfd)
+static int socket_loopback_reuseport(int family, int sotype, int progfd)
 {
 	struct sockaddr_storage addr;
 	socklen_t len;
@@ -249,6 +249,9 @@ static int listen_loopback_reuseport(int family, int sotype, int progfd)
 	if (err)
 		goto close;
 
+	if (sotype == SOCK_DGRAM)
+		return s;
+
 	err = xlisten(s, SOMAXCONN);
 	if (err)
 		goto close;
@@ -259,9 +262,9 @@ static int listen_loopback_reuseport(int family, int sotype, int progfd)
 	return -1;
 }
 
-static int listen_loopback(int family, int sotype)
+static int socket_loopback(int family, int sotype)
 {
-	return listen_loopback_reuseport(family, sotype, -1);
+	return socket_loopback_reuseport(family, sotype, -1);
 }
 
 static void test_insert_invalid(int family, int sotype, int mapfd)
@@ -333,7 +336,7 @@ static void test_insert_listening(int family, int sotype, int mapfd)
 	u32 key;
 	int s;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -349,7 +352,7 @@ static void test_delete_after_insert(int family, int sotype, int mapfd)
 	u32 key;
 	int s;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -366,7 +369,7 @@ static void test_delete_after_close(int family, int sotype, int mapfd)
 	u64 value;
 	u32 key;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -390,7 +393,7 @@ static void test_lookup_after_insert(int family, int sotype, int mapfd)
 	u32 key;
 	int s;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -417,7 +420,7 @@ static void test_lookup_after_delete(int family, int sotype, int mapfd)
 	u64 value;
 	u32 key;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -439,7 +442,7 @@ static void test_lookup_32_bit_value(int family, int sotype, int mapfd)
 	u32 key, value32;
 	int err, s;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -470,11 +473,11 @@ static void test_update_listening(int family, int sotype, int mapfd)
 	u64 value;
 	u32 key;
 
-	s1 = listen_loopback(family, sotype);
+	s1 = socket_loopback(family, sotype);
 	if (s1 < 0)
 		return;
 
-	s2 = listen_loopback(family, sotype);
+	s2 = socket_loopback(family, sotype);
 	if (s2 < 0)
 		goto close_s1;
 
@@ -500,7 +503,7 @@ static void test_destroy_orphan_child(int family, int sotype, int mapfd)
 	u64 value;
 	u32 key;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -534,7 +537,7 @@ static void test_clone_after_delete(int family, int sotype, int mapfd)
 	u64 value;
 	u32 key;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s < 0)
 		return;
 
@@ -570,7 +573,7 @@ static void test_accept_after_delete(int family, int sotype, int mapfd)
 	socklen_t len;
 	u64 value;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s == -1)
 		return;
 
@@ -624,7 +627,7 @@ static void test_accept_before_delete(int family, int sotype, int mapfd)
 	socklen_t len;
 	u64 value;
 
-	s = listen_loopback(family, sotype);
+	s = socket_loopback(family, sotype);
 	if (s == -1)
 		return;
 
@@ -735,7 +738,7 @@ static void test_syn_recv_insert_delete(int family, int sotype, int mapfd)
 	int err, s;
 	u64 value;
 
-	s = listen_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
 	if (s < 0)
 		return;
 
@@ -877,7 +880,7 @@ static void redir_to_connected(int family, int sotype, int sock_mapfd,
 
 	zero_verdict_count(verd_mapfd);
 
-	s = listen_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
 	if (s < 0)
 		return;
 
@@ -1009,7 +1012,7 @@ static void redir_to_listening(int family, int sotype, int sock_mapfd,
 
 	zero_verdict_count(verd_mapfd);
 
-	s = listen_loopback(family, sotype | SOCK_NONBLOCK);
+	s = socket_loopback(family, sotype | SOCK_NONBLOCK);
 	if (s < 0)
 		return;
 
@@ -1120,7 +1123,7 @@ static void test_reuseport_select_listening(int family, int sotype,
 
 	zero_verdict_count(verd_map);
 
-	s = listen_loopback_reuseport(family, sotype, reuseport_prog);
+	s = socket_loopback_reuseport(family, sotype, reuseport_prog);
 	if (s < 0)
 		return;
 
@@ -1174,7 +1177,7 @@ static void test_reuseport_select_connected(int family, int sotype,
 
 	zero_verdict_count(verd_map);
 
-	s = listen_loopback_reuseport(family, sotype, reuseport_prog);
+	s = socket_loopback_reuseport(family, sotype, reuseport_prog);
 	if (s < 0)
 		return;
 
@@ -1249,11 +1252,11 @@ static void test_reuseport_mixed_groups(int family, int sotype, int sock_map,
 	zero_verdict_count(verd_map);
 
 	/* Create two listeners, each in its own reuseport group */
-	s1 = listen_loopback_reuseport(family, sotype, reuseport_prog);
+	s1 = socket_loopback_reuseport(family, sotype, reuseport_prog);
 	if (s1 < 0)
 		return;
 
-	s2 = listen_loopback_reuseport(family, sotype, reuseport_prog);
+	s2 = socket_loopback_reuseport(family, sotype, reuseport_prog);
 	if (s2 < 0)
 		goto close_srv1;