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diff --git a/src/peer_group.h b/src/peer_group.h
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+/*
+  Copyright (c) 2012-2015, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+   \file
+
+   Peer groups
+*/
+
+
+#pragma once
+
+#include "fastd.h"
+
+
+/**
+   A group of peers
+
+   Peer groups may be nested and form a tree
+*/
+struct fastd_peer_group {
+	fastd_peer_group_t *next;			/**< The next sibling in the group tree */
+	fastd_peer_group_t *parent;			/**< The group's parent group */
+	fastd_peer_group_t *children;			/**< The group's first child */
+
+	char *name;					/**< The group's name; NULL for the root group */
+	fastd_string_stack_t *peer_dirs;		/**< List of peer directories which belong to this group */
+
+	/* constraints */
+	int max_connections;				/**< The maximum number of connections to allow in this group; -1 for no limit */
+	fastd_string_stack_t *methods;			/**< The list of configured method names */
+};
+
+
+/**
+   Looks up an attribute in the peer group tree
+
+   Returns a pointer to the attribute, going up the group tree to the first group
+   where the attribute is not NULL if such a group exists.
+
+   @param group		the peer group
+   @param attr		the name of the member
+
+   \hideinitializer
+ */
+#define fastd_peer_group_lookup(group, attr) ({				\
+			const fastd_peer_group_t *_grp = (group);	\
+									\
+			while (_grp->parent && !_grp->attr)		\
+				_grp = _grp->parent;			\
+									\
+			&_grp->attr;					\
+		})
+
+/**
+   Looks up an attribute in the peer group tree, for a given peer
+
+   Returns a pointer to the attribute, going up the group tree to the first group
+   where the attribute is not NULL if such a group exists. Uses the default group
+   if no peer is given.
+
+   @param peer		the peer
+   @param attr		the name of the member
+
+   \hideinitializer
+ */
+#define fastd_peer_group_lookup_peer(peer, attr) ({			\
+			const fastd_peer_t *_peer = (peer);		\
+			_peer ? fastd_peer_group_lookup(_peer->group, attr) : &conf.peer_group->attr; \
+		})