services: wireguard: Add more configuration fields.

* gnu/services/vpn.scm (<wireguard-configuration>)[pre-up, post-up, pre-down,
post-down, table]: New fields.
(wireguard-configuration-file): Take them into account.
* doc/guix.texi (Wireguard): Update it.

doc/guix.texi

@@ -31442,6 +31442,24 @@ the file does not exist.
 The authorized peers on this interface.  This is a list of
 @var{wireguard-peer} records.
 
+@item @code{pre-up} (default: @code{'()})
+The script commands to be run before setting up the interface.
+
+@item @code{post-up} (default: @code{'()})
+The script commands to be run after setting up the interface.
+
+@item @code{pre-down} (default: @code{'()})
+The script commands to be run before tearing down the interface.
+
+@item @code{post-down} (default: @code{'()})
+The script commands to be run after tearing down the interface.
+
+@item @code{table} (default: @code{"auto"})
+The routing table to which routes are added, as a string.  There are two
+special values: @code{"off"} that disables the creation of routes
+altogether, and @code{"auto"} (the default) that adds routes to the
+default table and enables special handling of default routes.
+
 @end table
 @end deftp
 

gnu/services/vpn.scm

@@ -72,6 +72,11 @@ (define-module (gnu services vpn)
             wireguard-configuration-dns
             wireguard-configuration-private-key
             wireguard-configuration-peers
+            wireguard-configuration-pre-up
+            wireguard-configuration-post-up
+            wireguard-configuration-pre-down
+            wireguard-configuration-post-down
+            wireguard-configuration-table
 
             wireguard-service-type))
 
@@ -724,7 +729,17 @@ (define-record-type* <wireguard-configuration>
   (peers              wireguard-configuration-peers ;list of <wiregard-peer>
                       (default '()))
   (dns                wireguard-configuration-dns ;list of strings
-                      (default #f)))
+                      (default #f))
+  (pre-up             wireguard-configuration-pre-up ;list of strings
+                      (default '()))
+  (post-up            wireguard-configuration-post-up ;list of strings
+                      (default '()))
+  (pre-down           wireguard-configuration-pre-down ;list of strings
+                      (default '()))
+  (post-down          wireguard-configuration-post-down ;list of strings
+                      (default '()))
+  (table              wireguard-configuration-table ;string
+                      (default "auto")))
 
 (define (wireguard-configuration-file config)
   (define (peer->config peer)
@@ -748,7 +763,8 @@ (define (peer->config peer)
                   "\n"))))
 
   (match-record config <wireguard-configuration>
-    (wireguard interface addresses port private-key peers dns)
+    (wireguard interface addresses port private-key peers dns
+               pre-up post-up pre-down post-down table)
     (let* ((config-file (string-append interface ".conf"))
            (peers (map peer->config peers))
            (config
@@ -762,13 +778,49 @@ (define (peer->config peer)
                      (let ((format (@ (ice-9 format) format)))
                        (format port "[Interface]
 Address = ~a
+~a
+~a
 PostUp = ~a set %i private-key ~a
 ~a
 ~a
+~a
+~a
+~a
 ~{~a~^~%~}"
                                #$(string-join addresses ",")
+                               #$(if table
+                                     (format #f "Table = ~a" table)
+                                     "")
+                               #$(if (null? pre-up)
+                                     ""
+                                     (string-join
+                                      (map (lambda (command)
+                                             (format #f "PreUp = ~a" command))
+                                           pre-up)
+                                      "\n"))
                                #$(file-append wireguard "/bin/wg")
                                #$private-key
+                               #$(if (null? post-up)
+                                     ""
+                                     (string-join
+                                      (map (lambda (command)
+                                             (format #f "PostUp = ~a" command))
+                                           post-up)
+                                      "\n"))
+                               #$(if (null? pre-down)
+                                     ""
+                                     (string-join
+                                      (map (lambda (command)
+                                             (format #f "PreDown = ~a" command))
+                                           pre-down)
+                                      "\n"))
+                               #$(if (null? post-down)
+                                     ""
+                                     (string-join
+                                      (map (lambda (command)
+                                             (format #f "PostDown = ~a" command))
+                                           post-down)
+                                      "\n"))
                                #$(if port
                                      (format #f "ListenPort = ~a" port)
                                      "")