diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 7f3af1d786c0268224a92df423230ea9dcabe44a..77f69188e6725232afc9a1624f4b2fb9516f0dd3 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -18,6 +18,11 @@ mod ossl110;
 #[cfg(ossl110)]
 pub use ossl110::*;
 
+#[cfg(ossl111)]
+mod ossl111;
+#[cfg(ossl111)]
+pub use ossl111::*;
+
 #[cfg(libressl)]
 mod libressl;
 #[cfg(libressl)]
@@ -1430,6 +1435,8 @@ pub const GEN_URI: c_int = 6;
 pub const GEN_IPADD: c_int = 7;
 pub const GEN_RID: c_int = 8;
 
+pub const DTLS1_COOKIE_LENGTH: c_uint = 256;
+
 // macros
 pub unsafe fn BIO_get_mem_data(b: *mut BIO, pp: *mut *mut c_char) -> c_long {
     BIO_ctrl(b, BIO_CTRL_INFO, 0, pp as *mut c_void)
@@ -2762,4 +2769,33 @@ extern "C" {
     pub fn FIPS_mode_set(onoff: c_int) -> c_int;
     #[cfg(not(libressl))]
     pub fn FIPS_mode() -> c_int;
+
+    pub fn SSL_CTX_set_cookie_generate_cb(
+        s: *mut SSL_CTX,
+        cb: Option<extern "C" fn(
+            ssl: *mut SSL,
+            cookie: *mut c_uchar,
+            cookie_len: *mut c_uint
+        ) -> c_int>
+    );
+
+    #[cfg(ossl110)]
+    pub fn SSL_CTX_set_cookie_verify_cb(
+        s: *mut SSL_CTX,
+        cb: Option<extern "C" fn(
+            ssl: *mut SSL,
+            cookie: *const c_uchar,
+            cookie_len: c_uint
+        ) -> c_int>
+    );
+
+    #[cfg(not(ossl110))]
+    pub fn SSL_CTX_set_cookie_verify_cb(
+        s: *mut SSL_CTX,
+        cb: Option<extern "C" fn(
+            ssl: *mut SSL,
+            cookie: *mut c_uchar,
+            cookie_len: c_uint
+        ) -> c_int>
+    );
 }
diff --git a/openssl-sys/src/ossl111.rs b/openssl-sys/src/ossl111.rs
new file mode 100644
index 0000000000000000000000000000000000000000..c22d506c3415c96e77ca92ae5c849b8e8e141294
--- /dev/null
+++ b/openssl-sys/src/ossl111.rs
@@ -0,0 +1,11 @@
+use libc::{c_int, c_ulong};
+
+use ossl110::*;
+
+pub const SSL_COOKIE_LENGTH: c_int = 255;
+
+pub const SSL_OP_ENABLE_MIDDLEBOX_COMPAT: c_ulong = 0x00100000;
+
+extern "C" {
+    pub fn SSL_stateless(s: *mut SSL) -> c_int;
+}