diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index d0a3c5e..52c8f7f 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -281,6 +281,10 @@
    in the Unix header files are defined; for a few symbols, default values are
    provided.
 
+   .. versionchanged:: 3.6
+      ``SO_DOMAIN``, ``SO_PROTOCOL``, ``SO_PEERSEC``, ``SO_PASSSEC``
+      were added.
+
 .. data:: AF_CAN
           PF_CAN
           SOL_CAN_*
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index 28f9d9f..8b85b22 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -406,6 +406,10 @@
 control code.
 (Contributed by Daniel Stokes in :issue:`26536`.)
 
+The :meth:`~socket.socket.getsockopt` constants ``SO_DOMAIN``,
+``SO_PROTOCOL``, ``SO_PEERSEC``, and ``SO_PASSSEC`` are now supported.
+(Contributed by Christian Heimes in :issue:`26907`.)
+
 
 socketserver
 ------------
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index d21509e..d896cc0 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -6582,6 +6582,12 @@
 #ifdef  LOCAL_PEERCRED
     PyModule_AddIntMacro(m, LOCAL_PEERCRED);
 #endif
+#ifdef  SO_PASSSEC
+    PyModule_AddIntMacro(m, SO_PASSSEC);
+#endif
+#ifdef  SO_PEERSEC
+    PyModule_AddIntMacro(m, SO_PEERSEC);
+#endif
 #ifdef  SO_BINDTODEVICE
     PyModule_AddIntMacro(m, SO_BINDTODEVICE);
 #endif
@@ -6591,6 +6597,12 @@
 #ifdef  SO_MARK
     PyModule_AddIntMacro(m, SO_MARK);
 #endif
+#ifdef SO_DOMAIN
+    PyModule_AddIntMacro(m, SO_DOMAIN);
+#endif
+#ifdef SO_PROTOCOL
+    PyModule_AddIntMacro(m, SO_PROTOCOL);
+#endif
 
     /* Maximum number of connections for "listen" */
 #ifdef  SOMAXCONN