diff --git a/src/network/ssl/qsslsocket_openssl11_symbols_p.h b/src/network/ssl/qsslsocket_openssl11_symbols_p.h
index 2980b3d23e..60134726fe 100644
--- a/src/network/ssl/qsslsocket_openssl11_symbols_p.h
+++ b/src/network/ssl/qsslsocket_openssl11_symbols_p.h
@@ -128,5 +128,44 @@ long q_OpenSSL_version_num();
 const char *q_OpenSSL_version(int type);
 
 unsigned long q_SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *session);
+unsigned long q_SSL_set_options(SSL *s, unsigned long op);
+
+// Functions and types required for DTLS support:
+extern "C"
+{
+
+typedef int (*CookieVerifyCallback)(SSL *, const unsigned char *, unsigned);
+typedef int (*DgramWriteCallback) (BIO *, const char *, int);
+typedef int (*DgramReadCallback) (BIO *, char *, int);
+typedef int (*DgramPutsCallback) (BIO *, const char *);
+typedef long (*DgramCtrlCallback) (BIO *, int, long, void *);
+typedef int (*DgramCreateCallback) (BIO *);
+typedef int (*DgramDestroyCallback) (BIO *);
+
+}
+
+int q_DTLSv1_listen(SSL *s, BIO_ADDR *client);
+BIO_ADDR *q_BIO_ADDR_new();
+void q_BIO_ADDR_free(BIO_ADDR *ap);
+int q_BIO_ADDR_family(const BIO_ADDR *ap);
+unsigned short q_BIO_ADDR_rawport(const BIO_ADDR *ap);
+int q_BIO_ADDR_rawaddress(const BIO_ADDR *ap, void *p, size_t *l);
+int q_BIO_ADDR_rawmake(BIO_ADDR *ap, int family, const void *where, size_t wherelen,
+                       unsigned short port);
+
+// API we need for a custom dgram BIO:
+BIO_METHOD *q_BIO_meth_new(int type, const char *name);
+void q_BIO_meth_free(BIO_METHOD *biom);
+int q_BIO_meth_set_write(BIO_METHOD *biom, DgramWriteCallback);
+int q_BIO_meth_set_read(BIO_METHOD *biom, DgramReadCallback);
+int q_BIO_meth_set_puts(BIO_METHOD *biom, DgramPutsCallback);
+int q_BIO_meth_set_ctrl(BIO_METHOD *biom, DgramCtrlCallback);
+int q_BIO_meth_set_create(BIO_METHOD *biom, DgramCreateCallback);
+int q_BIO_meth_set_destroy(BIO_METHOD *biom, DgramDestroyCallback);
+void q_BIO_set_data(BIO *a, void *ptr);
+void *q_BIO_get_data(BIO *a);
+void q_BIO_set_init(BIO *a, int init);
+int q_BIO_get_shutdown(BIO *a);
+void q_BIO_set_shutdown(BIO *a, int shut);
 
 #endif
diff --git a/src/network/ssl/qsslsocket_openssl_symbols.cpp b/src/network/ssl/qsslsocket_openssl_symbols.cpp
index 9bb67771fd..2361697f10 100644
--- a/src/network/ssl/qsslsocket_openssl_symbols.cpp
+++ b/src/network/ssl/qsslsocket_openssl_symbols.cpp
@@ -162,6 +162,7 @@ DEFINEFUNC2(unsigned long, SSL_CTX_set_options, SSL_CTX *ctx, ctx, unsigned long
 DEFINEFUNC3(size_t, SSL_get_client_random, SSL *a, a, unsigned char *out, out, size_t outlen, outlen, return 0, return)
 DEFINEFUNC3(size_t, SSL_SESSION_get_master_key, const SSL_SESSION *ses, ses, unsigned char *out, out, size_t outlen, outlen, return 0, return)
 DEFINEFUNC6(int, CRYPTO_get_ex_new_index, int class_index, class_index, long argl, argl, void *argp, argp, CRYPTO_EX_new *new_func, new_func, CRYPTO_EX_dup *dup_func, dup_func, CRYPTO_EX_free *free_func, free_func, return -1, return)
+DEFINEFUNC2(unsigned long, SSL_set_options, SSL *ssl, ssl, unsigned long op, op, return 0, return)
 
 DEFINEFUNC(const SSL_METHOD *, TLS_method, DUMMYARG, DUMMYARG, return 0, return)
 DEFINEFUNC(const SSL_METHOD *, TLS_client_method, DUMMYARG, DUMMYARG, return 0, return)
@@ -178,6 +179,26 @@ DEFINEFUNC(const char *, OpenSSL_version, int a, a, return 0, return)
 DEFINEFUNC(unsigned long, SSL_SESSION_get_ticket_lifetime_hint, const SSL_SESSION *session, session, return 0, return)
 DEFINEFUNC4(void, DH_get0_pqg, const DH *dh, dh, const BIGNUM **p, p, const BIGNUM **q, q, const BIGNUM **g, g, return, DUMMYARG)
 DEFINEFUNC(int, DH_bits, DH *dh, dh, return 0, return)
+DEFINEFUNC2(int, DTLSv1_listen, SSL *s, s, BIO_ADDR *c, c, return -1, return)
+DEFINEFUNC(BIO_ADDR *, BIO_ADDR_new, DUMMYARG, DUMMYARG, return nullptr, return)
+DEFINEFUNC(void, BIO_ADDR_free, BIO_ADDR *ap, ap, return, DUMMYARG)
+DEFINEFUNC(int, BIO_ADDR_family, const BIO_ADDR *ap, ap, return 0, return)
+DEFINEFUNC(unsigned short, BIO_ADDR_rawport, const BIO_ADDR *ap, ap, return 0, return)
+DEFINEFUNC3(int, BIO_ADDR_rawaddress, const BIO_ADDR *ap, ap, void *p, p, size_t *l, l, return 0, return)
+DEFINEFUNC5(int, BIO_ADDR_rawmake, BIO_ADDR *ap, ap, int family, family, const void *where, where, size_t len, len, unsigned short port, port, return 0, return)
+DEFINEFUNC2(BIO_METHOD *, BIO_meth_new, int type, type, const char *name, name, return nullptr, return)
+DEFINEFUNC(void, BIO_meth_free, BIO_METHOD *biom, biom, return, DUMMYARG)
+DEFINEFUNC2(int, BIO_meth_set_write, BIO_METHOD *biom, biom, DgramWriteCallback write, write, return 0, return)
+DEFINEFUNC2(int, BIO_meth_set_read, BIO_METHOD *biom, biom, DgramReadCallback read, read, return 0, return)
+DEFINEFUNC2(int, BIO_meth_set_puts, BIO_METHOD *biom, biom, DgramPutsCallback puts, puts, return 0, return)
+DEFINEFUNC2(int, BIO_meth_set_ctrl, BIO_METHOD *biom, biom, DgramCtrlCallback ctrl, ctrl, return 0, return)
+DEFINEFUNC2(int, BIO_meth_set_create, BIO_METHOD *biom, biom, DgramCreateCallback crt, crt, return 0, return)
+DEFINEFUNC2(int, BIO_meth_set_destroy, BIO_METHOD *biom, biom, DgramDestroyCallback dtr, dtr, return 0, return)
+DEFINEFUNC2(void, BIO_set_data, BIO *a, a, void *ptr, ptr, return, DUMMYARG)
+DEFINEFUNC(void *, BIO_get_data, BIO *a, a, return nullptr, return)
+DEFINEFUNC2(void, BIO_set_init, BIO *a, a, int init, init, return, DUMMYARG)
+DEFINEFUNC(int, BIO_get_shutdown, BIO *a, a, return -1, return)
+DEFINEFUNC2(void, BIO_set_shutdown, BIO *a, a, int shut, shut, return, DUMMYARG)
 
 #else // QT_CONFIG(opensslv11)
 
@@ -313,6 +334,7 @@ DEFINEFUNC(DSA *, DSA_new, DUMMYARG, DUMMYARG, return 0, return)
 DEFINEFUNC(void, DSA_free, DSA *a, a, return, DUMMYARG)
 DEFINEFUNC3(X509 *, d2i_X509, X509 **a, a, const unsigned char **b, b, long c, c, return 0, return)
 DEFINEFUNC2(char *, ERR_error_string, unsigned long a, a, char *b, b, return 0, return)
+DEFINEFUNC3(void, ERR_error_string_n, unsigned long e, e, char *b, b, size_t len, len, return, DUMMYARG)
 DEFINEFUNC(unsigned long, ERR_get_error, DUMMYARG, DUMMYARG, return 0, return)
 DEFINEFUNC(EVP_CIPHER_CTX *, EVP_CIPHER_CTX_new, void, DUMMYARG, return 0, return)
 DEFINEFUNC(void, EVP_CIPHER_CTX_free, EVP_CIPHER_CTX *a, a, return, DUMMYARG)
@@ -377,12 +399,14 @@ DEFINEFUNC2(int, PEM_write_bio_EC_PUBKEY, BIO *a, a, EC_KEY *b, b, return 0, ret
 #endif
 DEFINEFUNC2(void, RAND_seed, const void *a, a, int b, b, return, DUMMYARG)
 DEFINEFUNC(int, RAND_status, void, DUMMYARG, return -1, return)
+DEFINEFUNC2(int, RAND_bytes, unsigned char *b, b, int n, n, return 0, return)
 DEFINEFUNC(RSA *, RSA_new, DUMMYARG, DUMMYARG, return 0, return)
 DEFINEFUNC(void, RSA_free, RSA *a, a, return, DUMMYARG)
 DEFINEFUNC(int, SSL_accept, SSL *a, a, return -1, return)
 DEFINEFUNC(int, SSL_clear, SSL *a, a, return -1, return)
 DEFINEFUNC3(char *, SSL_CIPHER_description, const SSL_CIPHER *a, a, char *b, b, int c, c, return 0, return)
 DEFINEFUNC2(int, SSL_CIPHER_get_bits, const SSL_CIPHER *a, a, int *b, b, return 0, return)
+DEFINEFUNC(BIO *, SSL_get_rbio, const SSL *s, s, return nullptr, return)
 DEFINEFUNC(int, SSL_connect, SSL *a, a, return -1, return)
 DEFINEFUNC(int, SSL_CTX_check_private_key, const SSL_CTX *a, a, return -1, return)
 DEFINEFUNC4(long, SSL_CTX_ctrl, SSL_CTX *a, a, int b, b, long c, c, void *d, d, return -1, return)
@@ -434,6 +458,7 @@ DEFINEFUNC3(void, SSL_set_bio, SSL *a, a, BIO *b, b, BIO *c, c, return, DUMMYARG
 DEFINEFUNC(void, SSL_set_accept_state, SSL *a, a, return, DUMMYARG)
 DEFINEFUNC(void, SSL_set_connect_state, SSL *a, a, return, DUMMYARG)
 DEFINEFUNC(int, SSL_shutdown, SSL *a, a, return -1, return)
+DEFINEFUNC(int, SSL_get_shutdown, const SSL *ssl, ssl, return 0, return)
 DEFINEFUNC2(int, SSL_set_session, SSL* to, to, SSL_SESSION *session, session, return -1, return)
 DEFINEFUNC(void, SSL_SESSION_free, SSL_SESSION *ses, ses, return, DUMMYARG)
 DEFINEFUNC(SSL_SESSION*, SSL_get1_session, SSL *ssl, ssl, return 0, return)
@@ -490,6 +515,8 @@ DEFINEFUNC(int, X509_STORE_CTX_get_error, X509_STORE_CTX *a, a, return -1, retur
 DEFINEFUNC(int, X509_STORE_CTX_get_error_depth, X509_STORE_CTX *a, a, return -1, return)
 DEFINEFUNC(X509 *, X509_STORE_CTX_get_current_cert, X509_STORE_CTX *a, a, return 0, return)
 DEFINEFUNC(X509_STORE_CTX *, X509_STORE_CTX_new, DUMMYARG, DUMMYARG, return 0, return)
+DEFINEFUNC2(void *, X509_STORE_CTX_get_ex_data, X509_STORE_CTX *ctx, ctx, int idx, idx, return nullptr, return)
+DEFINEFUNC(int, SSL_get_ex_data_X509_STORE_CTX_idx, DUMMYARG, DUMMYARG, return -1, return)
 DEFINEFUNC3(int, SSL_CTX_load_verify_locations, SSL_CTX *ctx, ctx, const char *CAfile, CAfile, const char *CApath, CApath, return 0, return)
 DEFINEFUNC2(int, i2d_SSL_SESSION, SSL_SESSION *in, in, unsigned char **pp, pp, return 0, return)
 DEFINEFUNC3(SSL_SESSION *, d2i_SSL_SESSION, SSL_SESSION **a, a, const unsigned char **pp, pp, long length, length, return 0, return)
@@ -519,6 +546,18 @@ DEFINEFUNC3(void, SSL_get0_alpn_selected, const SSL *s, s, const unsigned char *
             unsigned *len, len, return, DUMMYARG)
 #endif // OPENSSL_VERSION_NUMBER >= 0x10002000L ...
 #endif // OPENSSL_VERSION_NUMBER >= 0x1000100fL ...
+
+// DTLS:
+DEFINEFUNC2(void, SSL_CTX_set_cookie_generate_cb, SSL_CTX *ctx, ctx, CookieGenerateCallback cb, cb, return, DUMMYARG)
+DEFINEFUNC2(void, SSL_CTX_set_cookie_verify_cb, SSL_CTX *ctx, ctx, CookieVerifyCallback cb, cb, return, DUMMYARG)
+DEFINEFUNC2(BIO *, BIO_new_dgram, int fd, fd, int flag, flag, return nullptr, return)
+DEFINEFUNC(const SSL_METHOD *, DTLS_server_method, DUMMYARG, DUMMYARG, return nullptr, return)
+DEFINEFUNC(const SSL_METHOD *, DTLS_client_method, DUMMYARG, DUMMYARG, return nullptr, return)
+DEFINEFUNC2(void, BIO_set_flags, BIO *b, b, int flags, flags, return, DUMMYARG)
+DEFINEFUNC2(void, BIO_clear_flags, BIO *b, b, int flags, flags, return, DUMMYARG)
+DEFINEFUNC2(void *, BIO_get_ex_data, BIO *b, b, int idx, idx, return nullptr, return)
+DEFINEFUNC3(int, BIO_set_ex_data, BIO *b, b, int idx, idx, void *data, data, return -1, return)
+
 DEFINEFUNC(DH *, DH_new, DUMMYARG, DUMMYARG, return 0, return)
 DEFINEFUNC(void, DH_free, DH *dh, dh, return, DUMMYARG)
 DEFINEFUNC3(DH *, d2i_DHparams, DH**a, a, const unsigned char **pp, pp, long length, length, return 0, return)
@@ -892,6 +931,7 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_SESSION_get_master_key)
     RESOLVEFUNC(SSL_session_reused)
     RESOLVEFUNC(SSL_get_session)
+    RESOLVEFUNC(SSL_set_options)
     RESOLVEFUNC(CRYPTO_get_ex_new_index)
     RESOLVEFUNC(TLS_method)
     RESOLVEFUNC(TLS_client_method)
@@ -917,7 +957,26 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_SESSION_get_ticket_lifetime_hint)
     RESOLVEFUNC(DH_bits)
     RESOLVEFUNC(DSA_bits)
-
+    RESOLVEFUNC(DTLSv1_listen)
+    RESOLVEFUNC(BIO_ADDR_new)
+    RESOLVEFUNC(BIO_ADDR_free)
+    RESOLVEFUNC(BIO_ADDR_family)
+    RESOLVEFUNC(BIO_ADDR_rawport)
+    RESOLVEFUNC(BIO_ADDR_rawaddress)
+    RESOLVEFUNC(BIO_ADDR_rawmake)
+    RESOLVEFUNC(BIO_meth_new)
+    RESOLVEFUNC(BIO_meth_free)
+    RESOLVEFUNC(BIO_meth_set_write)
+    RESOLVEFUNC(BIO_meth_set_read)
+    RESOLVEFUNC(BIO_meth_set_puts)
+    RESOLVEFUNC(BIO_meth_set_ctrl)
+    RESOLVEFUNC(BIO_meth_set_create)
+    RESOLVEFUNC(BIO_meth_set_destroy)
+    RESOLVEFUNC(BIO_set_data)
+    RESOLVEFUNC(BIO_get_data)
+    RESOLVEFUNC(BIO_set_init)
+    RESOLVEFUNC(BIO_get_shutdown)
+    RESOLVEFUNC(BIO_set_shutdown)
 #else // !opensslv11
 
     RESOLVEFUNC(ASN1_STRING_data)
@@ -1017,9 +1076,15 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(BIO_free)
     RESOLVEFUNC(BIO_new)
     RESOLVEFUNC(BIO_new_mem_buf)
+    RESOLVEFUNC(BIO_new_dgram)
     RESOLVEFUNC(BIO_read)
     RESOLVEFUNC(BIO_s_mem)
     RESOLVEFUNC(BIO_write)
+    RESOLVEFUNC(BIO_set_flags)
+    RESOLVEFUNC(BIO_clear_flags)
+    RESOLVEFUNC(BIO_set_ex_data)
+    RESOLVEFUNC(BIO_get_ex_data)
+
 #ifndef OPENSSL_NO_EC
     RESOLVEFUNC(EC_KEY_get0_group)
     RESOLVEFUNC(EC_GROUP_get_degree)
@@ -1032,6 +1097,7 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(DSA_new)
     RESOLVEFUNC(DSA_free)
     RESOLVEFUNC(ERR_error_string)
+    RESOLVEFUNC(ERR_error_string_n)
     RESOLVEFUNC(ERR_get_error)
     RESOLVEFUNC(EVP_CIPHER_CTX_new)
     RESOLVEFUNC(EVP_CIPHER_CTX_free)
@@ -1095,10 +1161,12 @@ bool q_resolveOpenSslSymbols()
 #endif
     RESOLVEFUNC(RAND_seed)
     RESOLVEFUNC(RAND_status)
+    RESOLVEFUNC(RAND_bytes)
     RESOLVEFUNC(RSA_new)
     RESOLVEFUNC(RSA_free)
     RESOLVEFUNC(SSL_CIPHER_description)
     RESOLVEFUNC(SSL_CIPHER_get_bits)
+    RESOLVEFUNC(SSL_get_rbio)
     RESOLVEFUNC(SSL_CTX_check_private_key)
     RESOLVEFUNC(SSL_CTX_ctrl)
     RESOLVEFUNC(SSL_CTX_free)
@@ -1139,6 +1207,7 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_set_bio)
     RESOLVEFUNC(SSL_set_connect_state)
     RESOLVEFUNC(SSL_shutdown)
+    RESOLVEFUNC(SSL_get_shutdown)
     RESOLVEFUNC(SSL_set_session)
     RESOLVEFUNC(SSL_SESSION_free)
     RESOLVEFUNC(SSL_get1_session)
@@ -1146,6 +1215,7 @@ bool q_resolveOpenSslSymbols()
 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
     RESOLVEFUNC(SSL_set_ex_data)
     RESOLVEFUNC(SSL_get_ex_data)
+    RESOLVEFUNC(SSL_get_ex_data_X509_STORE_CTX_idx)
 #endif
 #if OPENSSL_VERSION_NUMBER >= 0x10001000L && !defined(OPENSSL_NO_PSK)
     RESOLVEFUNC(SSL_set_psk_client_callback)
@@ -1169,6 +1239,8 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(X509_STORE_CTX_get_error_depth)
     RESOLVEFUNC(X509_STORE_CTX_get_current_cert)
     RESOLVEFUNC(X509_cmp)
+    RESOLVEFUNC(X509_STORE_CTX_get_ex_data)
+
 #ifndef SSLEAY_MACROS
     RESOLVEFUNC(X509_dup)
 #endif
@@ -1206,6 +1278,10 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_CTX_set_alpn_select_cb)
     RESOLVEFUNC(SSL_get0_alpn_selected)
 #endif // OPENSSL_VERSION_NUMBER >= 0x10002000L ...
+    RESOLVEFUNC(SSL_CTX_set_cookie_generate_cb)
+    RESOLVEFUNC(SSL_CTX_set_cookie_verify_cb)
+    RESOLVEFUNC(DTLS_server_method)
+    RESOLVEFUNC(DTLS_client_method)
     RESOLVEFUNC(DH_new)
     RESOLVEFUNC(DH_free)
     RESOLVEFUNC(d2i_DHparams)
diff --git a/src/network/ssl/qsslsocket_openssl_symbols_p.h b/src/network/ssl/qsslsocket_openssl_symbols_p.h
index be67f38b64..afac989de3 100644
--- a/src/network/ssl/qsslsocket_openssl_symbols_p.h
+++ b/src/network/ssl/qsslsocket_openssl_symbols_p.h
@@ -257,6 +257,7 @@ DSA *q_DSA_new();
 void q_DSA_free(DSA *a);
 X509 *q_d2i_X509(X509 **a, const unsigned char **b, long c);
 char *q_ERR_error_string(unsigned long a, char *b);
+void q_ERR_error_string_n(unsigned long e, char *buf, size_t len);
 unsigned long q_ERR_get_error();
 EVP_CIPHER_CTX *q_EVP_CIPHER_CTX_new();
 void q_EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *a);
@@ -327,12 +328,14 @@ int q_PEM_write_bio_EC_PUBKEY(BIO *a, EC_KEY *b);
 #endif
 void q_RAND_seed(const void *a, int b);
 int q_RAND_status();
+int q_RAND_bytes(unsigned char *b, int n);
 RSA *q_RSA_new();
 void q_RSA_free(RSA *a);
 int q_SSL_accept(SSL *a);
 int q_SSL_clear(SSL *a);
 char *q_SSL_CIPHER_description(const SSL_CIPHER *a, char *b, int c);
 int q_SSL_CIPHER_get_bits(const SSL_CIPHER *a, int *b);
+BIO *q_SSL_get_rbio(const SSL *s);
 int q_SSL_connect(SSL *a);
 int q_SSL_CTX_check_private_key(const SSL_CTX *a);
 long q_SSL_CTX_ctrl(SSL_CTX *a, int b, long c, void *d);
@@ -379,6 +382,7 @@ void q_SSL_set_bio(SSL *a, BIO *b, BIO *c);
 void q_SSL_set_accept_state(SSL *a);
 void q_SSL_set_connect_state(SSL *a);
 int q_SSL_shutdown(SSL *a);
+int q_SSL_get_shutdown(const SSL *ssl);
 int q_SSL_set_session(SSL *to, SSL_SESSION *session);
 void q_SSL_SESSION_free(SSL_SESSION *ses);
 SSL_SESSION *q_SSL_get1_session(SSL *ssl);
@@ -477,6 +481,7 @@ void q_PKCS12_free(PKCS12 *pkcs12);
 
 #define q_BIO_get_mem_data(b, pp) (int)q_BIO_ctrl(b,BIO_CTRL_INFO,0,(char *)pp)
 #define q_BIO_pending(b) (int)q_BIO_ctrl(b,BIO_CTRL_PENDING,0,NULL)
+#define q_BIO_dgram_get_peer(b, peer) (int)q_BIO_ctrl(b, BIO_CTRL_DGRAM_GET_PEER, 0, (char *)peer)
 #define q_SSL_CTX_set_mode(ctx,op) q_SSL_CTX_ctrl((ctx),SSL_CTRL_MODE,(op),NULL)
 #define q_sk_GENERAL_NAME_num(st) q_SKM_sk_num(GENERAL_NAME, (st))
 #define q_sk_GENERAL_NAME_value(st, i) q_SKM_sk_value(GENERAL_NAME, (st), (i))
@@ -522,6 +527,36 @@ void q_SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
 #endif
 #endif // OPENSSL_VERSION_NUMBER >= 0x1000100fL ...
 
+extern "C"
+{
+typedef int (*CookieGenerateCallback)(SSL *, unsigned char *, unsigned *);
+}
+
+void q_SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, CookieGenerateCallback cb);
+void q_SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, CookieVerifyCallback cb);
+BIO *q_BIO_new_dgram(int fd, int close_flag);
+const SSL_METHOD *q_DTLS_server_method();
+const SSL_METHOD *q_DTLS_client_method();
+
+void *q_X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx);
+int q_SSL_get_ex_data_X509_STORE_CTX_idx();
+
+#define q_DTLS_get_link_min_mtu(ssl) q_SSL_ctrl((ssl), DTLS_CTRL_GET_LINK_MIN_MTU, 0, nullptr)
+#define q_DTLS_set_link_mtu(ssl, mtu) q_SSL_ctrl((ssl), DTLS_CTRL_SET_LINK_MTU, (mtu), nullptr)
+#define q_DTLSv1_get_timeout(ssl, arg) q_SSL_ctrl(ssl, DTLS_CTRL_GET_TIMEOUT, 0, arg)
+#define q_DTLSv1_handle_timeout(ssl) q_SSL_ctrl(ssl, DTLS_CTRL_HANDLE_TIMEOUT, 0, nullptr)
+
+void q_BIO_set_flags(BIO *b, int flags);
+void q_BIO_clear_flags(BIO *b, int flags);
+void *q_BIO_get_ex_data(BIO *b, int idx);
+int q_BIO_set_ex_data(BIO *b, int idx, void *data);
+
+#define q_BIO_set_retry_read(b) q_BIO_set_flags(b, (BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY))
+#define q_BIO_set_retry_write(b) q_BIO_set_flags(b, (BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY))
+#define q_BIO_clear_retry_flags(b) q_BIO_clear_flags(b, (BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))
+#define q_BIO_set_app_data(s,arg) q_BIO_set_ex_data(s,0,arg)
+#define q_BIO_get_app_data(s) q_BIO_get_ex_data(s,0)
+
 // Helper function
 class QDateTime;
 QDateTime q_getTimeFromASN1(const ASN1_TIME *aTime);
diff --git a/src/network/ssl/qsslsocket_opensslpre11_symbols_p.h b/src/network/ssl/qsslsocket_opensslpre11_symbols_p.h
index 9686d22b98..6676f768a7 100644
--- a/src/network/ssl/qsslsocket_opensslpre11_symbols_p.h
+++ b/src/network/ssl/qsslsocket_opensslpre11_symbols_p.h
@@ -204,6 +204,7 @@ DSA *q_d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
 #endif // SSLEAY_MACROS
 
 #define q_SSL_CTX_set_options(ctx,op) q_SSL_CTX_ctrl((ctx),SSL_CTRL_OPTIONS,(op),NULL)
+#define q_SSL_set_options(ssl,op) q_SSL_ctrl((ssl),SSL_CTRL_OPTIONS,(op),nullptr)
 #define q_SKM_sk_num(type, st) ((int (*)(const STACK_OF(type) *))q_sk_num)(st)
 #define q_SKM_sk_value(type, st,i) ((type * (*)(const STACK_OF(type) *, int))q_sk_value)(st, i)
 #define q_X509_getm_notAfter(x) X509_get_notAfter(x)
@@ -226,5 +227,11 @@ void q_OPENSSL_add_all_algorithms_conf();
 long q_SSLeay();
 const char *q_SSLeay_version(int type);
 
+// DTLS:
+extern "C"
+{
+typedef int (*CookieVerifyCallback)(SSL *, unsigned char *, unsigned);
+}
+#define q_DTLSv1_listen(ssl, peer) q_SSL_ctrl(ssl, DTLS_CTRL_LISTEN, 0, (void *)peer)
 
 #endif // QSSLSOCKET_OPENSSL_PRE11_SYMBOLS_P_H