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-rw-r--r--openssl/ssl/d1_lib.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/openssl/ssl/d1_lib.c b/openssl/ssl/d1_lib.c
index 6bde16fa2..82ca65392 100644
--- a/openssl/ssl/d1_lib.c
+++ b/openssl/ssl/d1_lib.c
@@ -266,6 +266,16 @@ long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
case DTLS_CTRL_LISTEN:
ret = dtls1_listen(s, parg);
break;
+ case SSL_CTRL_CHECK_PROTO_VERSION:
+ /* For library-internal use; checks that the current protocol
+ * is the highest enabled version (according to s->ctx->method,
+ * as version negotiation may have changed s->method). */
+#if DTLS_MAX_VERSION != DTLS1_VERSION
+# error Code needs update for DTLS_method() support beyond DTLS1_VERSION.
+#endif
+ /* Just one protocol version is supported so far;
+ * fail closed if the version is not as expected. */
+ return s->version == DTLS_MAX_VERSION;
default:
ret = ssl3_ctrl(s, cmd, larg, parg);