selftests/tls: fix selftest with CHACHA20-POLY1305

TLS selftests were broken also because of use of structure that
was not exported to UAPI. Fix by defining the union in tests.

Fixes: 4f336e88 (selftests/tls: add CHACHA20-POLY1305 to tls selftests)
Reported-by: Rong Chen <rong.a.chen@intel.com>
Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Link: https://lore.kernel.org/r/1612384634-5377-1-git-send-email-vfedorenko@novek.ruSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/tls.c

@@ -133,7 +133,10 @@ FIXTURE_VARIANT_ADD(tls, 13_chacha)
 
 FIXTURE_SETUP(tls)
 {
-	union tls_crypto_context tls12;
+	union {
+		struct tls12_crypto_info_aes_gcm_128 aes128;
+		struct tls12_crypto_info_chacha20_poly1305 chacha20;
+	} tls12;
 	struct sockaddr_in addr;
 	socklen_t len;
 	int sfd, ret;
@@ -143,14 +146,16 @@ FIXTURE_SETUP(tls)
 	len = sizeof(addr);
 
 	memset(&tls12, 0, sizeof(tls12));
-	tls12.info.version = variant->tls_version;
-	tls12.info.cipher_type = variant->cipher_type;
 	switch (variant->cipher_type) {
 	case TLS_CIPHER_CHACHA20_POLY1305:
-		tls12_sz = sizeof(tls12_crypto_info_chacha20_poly1305);
+		tls12_sz = sizeof(struct tls12_crypto_info_chacha20_poly1305);
+		tls12.chacha20.info.version = variant->tls_version;
+		tls12.chacha20.info.cipher_type = variant->cipher_type;
 		break;
 	case TLS_CIPHER_AES_GCM_128:
-		tls12_sz = sizeof(tls12_crypto_info_aes_gcm_128);
+		tls12_sz = sizeof(struct tls12_crypto_info_aes_gcm_128);
+		tls12.aes128.info.version = variant->tls_version;
+		tls12.aes128.info.cipher_type = variant->cipher_type;
 		break;
 	default:
 		tls12_sz = 0;