add documentation

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7848)

doc/man3/BIO_ctrl.pod

@@ -5,7 +5,8 @@
 BIO_ctrl, BIO_callback_ctrl, BIO_ptr_ctrl, BIO_int_ctrl, BIO_reset,
 BIO_seek, BIO_tell, BIO_flush, BIO_eof, BIO_set_close, BIO_get_close,
 BIO_pending, BIO_wpending, BIO_ctrl_pending, BIO_ctrl_wpending,
-BIO_get_info_callback, BIO_set_info_callback, BIO_info_cb, BIO_get_ktls_send
+BIO_get_info_callback, BIO_set_info_callback, BIO_info_cb, BIO_get_ktls_send,
+BIO_get_ktls_recv
 - BIO control operations
 
 =head1 SYNOPSIS
@@ -35,6 +36,7 @@ BIO_get_info_callback, BIO_set_info_callback, BIO_info_cb, BIO_get_ktls_send
  int BIO_set_info_callback(BIO *b, BIO_info_cb *cb);
 
  int BIO_get_ktls_send(BIO *b);
+ int BIO_get_ktls_recv(BIO *b);
 
 =head1 DESCRIPTION
 
@@ -74,8 +76,10 @@ Not all BIOs support these calls. BIO_ctrl_pending() and BIO_ctrl_wpending()
 return a size_t type and are functions, BIO_pending() and BIO_wpending() are
 macros which call BIO_ctrl().
 
-BIO_get_ktls_send() return 1 if the BIO is using the Kernel TLS data-path for
+BIO_get_ktls_send() returns 1 if the BIO is using the Kernel TLS data-path for
 sending. Otherwise, it returns zero.
+BIO_get_ktls_recv() returns 1 if the BIO is using the Kernel TLS data-path for
+receiving. Otherwise, it returns zero.
 
 =head1 RETURN VALUES
 
@@ -97,8 +101,10 @@ BIO_get_close() returns the close flag value: BIO_CLOSE or BIO_NOCLOSE.
 BIO_pending(), BIO_ctrl_pending(), BIO_wpending() and BIO_ctrl_wpending()
 return the amount of pending data.
 
-BIO_get_ktls_send() return 1 if the BIO is using the Kernel TLS data-path for
+BIO_get_ktls_send() returns 1 if the BIO is using the Kernel TLS data-path for
 sending. Otherwise, it returns zero.
+BIO_get_ktls_recv() returns 1 if the BIO is using the Kernel TLS data-path for
+receiving. Otherwise, it returns zero.
 
 =head1 NOTES
 
@@ -134,7 +140,8 @@ the case of BIO_seek() on a file BIO for a successful operation.
 
 =head1 HISTORY
 
-The BIO_get_ktls_send() function was added in OpenSSL 3.0.0.
+The BIO_get_ktls_send() and BIO_get_ktls_recv() functions were added in
+OpenSSL 3.0.0.
 
 =head1 COPYRIGHT
 

util/private.num

@@ -116,6 +116,7 @@ BIO_get_cipher_ctx                      define
 BIO_get_cipher_status                   define
 BIO_get_close                           define
 BIO_get_ktls_send                       define
+BIO_get_ktls_recv                       define
 BIO_get_conn_address                    define
 BIO_get_conn_hostname                   define
 BIO_get_conn_port                       define