net: Add batman-adv meshing protocol

B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing
protocol for multi-hop ad-hoc mesh networks. The networks may be wired or
wireless. See http://www.open-mesh.org/ for more information and user space
tools.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/ABI/testing/sysfs-class-net-batman-adv

+
+What:           /sys/class/net/<iface>/batman-adv/mesh_iface
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                The /sys/class/net/<iface>/batman-adv/mesh_iface file
+                displays the batman mesh interface this <iface>
+                currently is associated with.
+
+What:           /sys/class/net/<iface>/batman-adv/iface_status
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Indicates the status of <iface> as it is seen by batman.

Documentation/ABI/testing/sysfs-class-net-mesh

+
+What:           /sys/class/net/<mesh_iface>/mesh/aggregated_ogms
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Indicates whether the batman protocol messages of the
+                mesh <mesh_iface> shall be aggregated or not.
+
+What:           /sys/class/net/<mesh_iface>/mesh/bonding
+Date:           June 2010
+Contact:        Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
+Description:
+                Indicates whether the data traffic going through the
+                mesh will be sent using multiple interfaces at the
+                same time (if available).
+
+What:           /sys/class/net/<mesh_iface>/mesh/fragmentation
+Date:           October 2010
+Contact:        Andreas Langer <an.langer@gmx.de>
+Description:
+                Indicates whether the data traffic going through the
+                mesh will be fragmented or silently discarded if the
+                packet size exceeds the outgoing interface MTU.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_bandwidth
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the bandwidth which is propagated by this
+                node if gw_mode was set to 'server'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_mode
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the state of the gateway features. Can be
+                either 'off', 'client' or 'server'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/gw_sel_class
+Date:           October 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the selection criteria this node will use
+                to choose a gateway if gw_mode was set to 'client'.
+
+What:           /sys/class/net/<mesh_iface>/mesh/orig_interval
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Defines the interval in milliseconds in which batman
+                sends its protocol messages.
+
+What:           /sys/class/net/<mesh_iface>/mesh/hop_penalty
+Date:           Oct 2010
+Contact:        Linus Lüssing <linus.luessing@web.de>
+Description:
+		Defines the penalty which will be applied to an
+		originator message's tq-field on every hop.
+
+What:           /sys/class/net/<mesh_iface>/mesh/vis_mode
+Date:           May 2010
+Contact:        Marek Lindner <lindner_marek@yahoo.de>
+Description:
+                Each batman node only maintains information about its
+                own local neighborhood, therefore generating graphs
+                showing the topology of the entire mesh is not easily
+                feasible without having a central instance to collect
+                the local topologies from all nodes. This file allows
+                to activate the collecting (server) mode.

Documentation/networking/batman-adv.txt

+[state: 21-11-2010]
+
+BATMAN-ADV
+----------
+
+Batman  advanced  is  a new approach to wireless networking which
+does no longer operate on the IP basis. Unlike the batman daemon,
+which  exchanges  information  using UDP packets and sets routing
+tables, batman-advanced operates on ISO/OSI Layer 2 only and uses
+and  routes  (or  better: bridges) Ethernet Frames. It emulates a
+virtual network switch of all nodes participating.  Therefore all
+nodes  appear  to be link local, thus all higher operating proto-
+cols won't be affected by any changes within the network. You can
+run almost any protocol above batman advanced, prominent examples
+are: IPv4, IPv6, DHCP, IPX.
+
+Batman advanced was implemented as a Linux kernel driver  to  re-
+duce the overhead to a minimum. It does not depend on any (other)
+network driver, and can be used on wifi as well as ethernet  lan,
+vpn,  etc ... (anything with ethernet-style layer 2).
+
+CONFIGURATION
+-------------
+
+Load the batman-adv module into your kernel:
+
+# insmod batman-adv.ko
+
+The  module  is now waiting for activation. You must add some in-
+terfaces on which batman can operate. After  loading  the  module
+batman  advanced  will scan your systems interfaces to search for
+compatible interfaces. Once found, it will create  subfolders  in
+the /sys directories of each supported interface, e.g.
+
+# ls /sys/class/net/eth0/batman_adv/
+# iface_status  mesh_iface
+
+If an interface does not have the "batman_adv" subfolder it prob-
+ably is not supported. Not supported  interfaces  are:  loopback,
+non-ethernet and batman's own interfaces.
+
+Note:  After the module was loaded it will continuously watch for
+new interfaces to verify the compatibility. There is no  need  to
+reload the module if you plug your USB wifi adapter into your ma-
+chine after batman advanced was initially loaded.
+
+To activate a  given  interface  simply  write  "bat0"  into  its
+"mesh_iface" file inside the batman_adv subfolder:
+
+# echo bat0 > /sys/class/net/eth0/batman_adv/mesh_iface
+
+Repeat  this step for all interfaces you wish to add.  Now batman
+starts using/broadcasting on this/these interface(s).
+
+By reading the "iface_status" file you can check its status:
+
+# cat /sys/class/net/eth0/batman_adv/iface_status
+# active
+
+To deactivate an interface you have  to  write  "none"  into  its
+"mesh_iface" file:
+
+# echo none > /sys/class/net/eth0/batman_adv/mesh_iface
+
+
+All  mesh  wide  settings  can be found in batman's own interface
+folder:
+
+#  ls  /sys/class/net/bat0/mesh/
+#  aggregated_ogms  bonding  fragmentation  orig_interval
+#  vis_mode
+
+
+There is a special folder for debugging informations:
+
+#  ls /sys/kernel/debug/batman_adv/bat0/
+#  originators  socket  transtable_global  transtable_local
+#  vis_data
+
+
+Some of the files contain all sort of status information  regard-
+ing  the  mesh  network.  For  example, you can view the table of
+originators (mesh participants) with:
+
+# cat /sys/kernel/debug/batman_adv/bat0/originators
+
+Other files allow to change batman's behaviour to better fit your
+requirements.  For instance, you can check the current originator
+interval (value in milliseconds which determines how often batman
+sends its broadcast packets):
+
+# cat /sys/class/net/bat0/mesh/orig_interval
+# 1000
+
+and also change its value:
+
+# echo 3000 > /sys/class/net/bat0/mesh/orig_interval
+
+In very mobile scenarios, you might want to adjust the originator
+interval to a lower value. This will make the mesh  more  respon-
+sive to topology changes, but will also increase the overhead.
+
+
+USAGE
+-----
+
+To  make use of your newly created mesh, batman advanced provides
+a new interface "bat0" which you should use from this  point  on.
+All  interfaces  added  to  batman  advanced are not relevant any
+longer because batman handles them for you. Basically, one "hands
+over" the data by using the batman interface and batman will make
+sure it reaches its destination.
+
+The "bat0" interface can be used like any  other  regular  inter-
+face.  It needs an IP address which can be either statically con-
+figured or dynamically (by using DHCP or similar services):
+
+# NodeA: ifconfig bat0 192.168.0.1
+# NodeB: ifconfig bat0 192.168.0.2
+# NodeB: ping 192.168.0.1
+
+Note:  In  order to avoid problems remove all IP addresses previ-
+ously assigned to interfaces now used by batman advanced, e.g.
+
+# ifconfig eth0 0.0.0.0
+
+
+VISUALIZATION
+-------------
+
+If you want topology visualization, at least one mesh  node  must
+be configured as VIS-server:
+
+# echo "server" > /sys/class/net/bat0/mesh/vis_mode
+
+Each  node  is  either configured as "server" or as "client" (de-
+fault: "client").  Clients send their topology data to the server
+next to them, and server synchronize with other servers. If there
+is no server configured (default) within the  mesh,  no  topology
+information   will  be  transmitted.  With  these  "synchronizing
+servers", there can be 1 or more vis servers sharing the same (or
+at least very similar) data.
+
+When  configured  as  server,  you can get a topology snapshot of
+your mesh:
+
+# cat /sys/kernel/debug/batman_adv/bat0/vis_data
+
+This raw output is intended to be easily parsable and convertable
+with  other tools. Have a look at the batctl README if you want a
+vis output in dot or json format for instance and how those  out-
+puts could then be visualised in an image.
+
+The raw format consists of comma separated values per entry where
+each entry is giving information about a  certain  source  inter-
+face.  Each  entry can/has to have the following values:
+-> "mac" - mac address of an originator's source interface
+           (each line begins with it)
+-> "TQ mac  value"  -  src mac's link quality towards mac address
+                       of a neighbor originator's interface which
+                       is being used for routing
+-> "HNA mac" - HNA announced by source mac
+-> "PRIMARY" - this  is a primary interface
+-> "SEC mac" - secondary mac address of source
+               (requires preceding PRIMARY)
+
+The TQ value has a range from 4 to 255 with 255 being  the  best.
+The HNA entries are showing which hosts are connected to the mesh
+via bat0 or being bridged into the mesh network.  The PRIMARY/SEC
+values are only applied on primary interfaces
+
+
+LOGGING/DEBUGGING
+-----------------
+
+All error messages, warnings and information messages are sent to
+the kernel log. Depending on your operating  system  distribution
+this  can  be read in one of a number of ways. Try using the com-
+mands: dmesg, logread, or looking in the files  /var/log/kern.log
+or  /var/log/syslog.  All  batman-adv  messages are prefixed with
+"batman-adv:" So to see just these messages try
+
+# dmesg | grep batman-adv
+
+When investigating problems with your mesh network  it  is  some-
+times  necessary  to see more detail debug messages. This must be
+enabled when compiling the batman-adv module. When building  bat-
+man-adv  as  part of kernel, use "make menuconfig" and enable the
+option "B.A.T.M.A.N. debugging".
+
+Those additional  debug messages can be accessed  using a special
+file in debugfs
+
+# cat /sys/kernel/debug/batman_adv/bat0/log
+
+The additional debug output is by default disabled. It can be en-
+abled  during run time. Following log_levels are defined:
+
+0 - All  debug  output  disabled
+1 - Enable messages related to routing / flooding / broadcasting
+2 - Enable route or hna added / changed / deleted
+3 - Enable all messages
+
+The debug output can be changed at runtime  using  the  file
+/sys/class/net/bat0/mesh/log_level. e.g.
+
+# echo 2 > /sys/class/net/bat0/mesh/log_level
+
+will enable debug messages for when routes or HNAs change.
+
+
+BATCTL
+------
+
+As batman advanced operates on layer 2 all hosts participating in
+the  virtual switch are completely transparent for all  protocols
+above layer 2. Therefore the common diagnosis tools do  not  work
+as  expected.  To  overcome these problems batctl was created. At
+the  moment the  batctl contains ping,  traceroute,  tcpdump  and
+interfaces to the kernel module settings.
+
+For more information, please see the manpage (man batctl).
+
+batctl is available on http://www.open-mesh.org/
+
+
+CONTACT
+-------
+
+Please send us comments, experiences, questions, anything :)
+
+IRC:            #batman   on   irc.freenode.org
+Mailing-list:   b.a.t.m.a.n@b.a.t.m.a.n@lists.open-mesh.org
+                (optional   subscription   at
+                 https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n)
+
+You can also contact the Authors:
+
+Marek  Lindner  <lindner_marek@yahoo.de>
+Simon  Wunderlich  <siwu@hrz.tu-chemnitz.de>

MAINTAINERS

@@ -1264,6 +1264,15 @@ S:	Maintained
 F:	drivers/video/backlight/
 F:	include/linux/backlight.h
 
+BATMAN ADVANCED
+M:	Marek Lindner <lindner_marek@yahoo.de>
+M:	Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
+M:	Sven Eckelmann <sven@narfation.org>
+L:	b.a.t.m.a.n@lists.open-mesh.org
+W:	http://www.open-mesh.org/
+S:	Maintained
+F:	net/batman-adv/
+
 BAYCOM/HDLCDRV DRIVERS FOR AX.25
 M:	Thomas Sailer <t.sailer@alumni.ethz.ch>
 L:	linux-hams@vger.kernel.org

net/Kconfig

@@ -214,6 +214,7 @@ source "net/ieee802154/Kconfig"
 source "net/sched/Kconfig"
 source "net/dcb/Kconfig"
 source "net/dns_resolver/Kconfig"
+source "net/batman-adv/Kconfig"
 
 config RPS
 	boolean

net/Makefile

@@ -69,3 +69,4 @@ endif
 obj-$(CONFIG_WIMAX)		+= wimax/
 obj-$(CONFIG_DNS_RESOLVER)	+= dns_resolver/
 obj-$(CONFIG_CEPH_LIB)		+= ceph/
+obj-$(CONFIG_BATMAN_ADV)	+= batman-adv/

net/batman-adv/Kconfig

+#
+# B.A.T.M.A.N meshing protocol
+#
+
+config BATMAN_ADV
+	tristate "B.A.T.M.A.N. Advanced Meshing Protocol"
+	depends on NET
+        default n
+	---help---
+
+        B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is
+        a routing protocol for multi-hop ad-hoc mesh networks. The
+        networks may be wired or wireless. See
+        http://www.open-mesh.org/ for more information and user space
+        tools.
+
+config BATMAN_ADV_DEBUG
+	bool "B.A.T.M.A.N. debugging"
+	depends on BATMAN_ADV != n
+	---help---
+
+	  This is an option for use by developers; most people should
+	  say N here. This enables compilation of support for
+	  outputting debugging information to the kernel log. The
+	  output is controlled via the module parameter debug.

net/batman-adv/Makefile

+#
+# Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+#
+# Marek Lindner, Simon Wunderlich
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of version 2 of the GNU General Public
+# License as published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA
+#
+
+obj-$(CONFIG_BATMAN_ADV) += batman-adv.o
+batman-adv-y += aggregation.o
+batman-adv-y += bat_debugfs.o
+batman-adv-y += bat_sysfs.o
+batman-adv-y += bitarray.o
+batman-adv-y += gateway_client.o
+batman-adv-y += gateway_common.o
+batman-adv-y += hard-interface.o
+batman-adv-y += hash.o
+batman-adv-y += icmp_socket.o
+batman-adv-y += main.o
+batman-adv-y += originator.o
+batman-adv-y += ring_buffer.o
+batman-adv-y += routing.o
+batman-adv-y += send.o
+batman-adv-y += soft-interface.o
+batman-adv-y += translation-table.o
+batman-adv-y += unicast.o
+batman-adv-y += vis.o

net/batman-adv/aggregation.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "aggregation.h"
+#include "send.h"
+#include "routing.h"
+
+/* calculate the size of the hna information for a given packet */
+static int hna_len(struct batman_packet *batman_packet)
+{
+	return batman_packet->num_hna * ETH_ALEN;
+}
+
+/* return true if new_packet can be aggregated with forw_packet */
+static bool can_aggregate_with(struct batman_packet *new_batman_packet,
+			       int packet_len,
+			       unsigned long send_time,
+			       bool directlink,
+			       struct batman_if *if_incoming,
+			       struct forw_packet *forw_packet)
+{
+	struct batman_packet *batman_packet =
+		(struct batman_packet *)forw_packet->skb->data;
+	int aggregated_bytes = forw_packet->packet_len + packet_len;
+
+	/**
+	 * we can aggregate the current packet to this aggregated packet
+	 * if:
+	 *
+	 * - the send time is within our MAX_AGGREGATION_MS time
+	 * - the resulting packet wont be bigger than
+	 *   MAX_AGGREGATION_BYTES
+	 */
+
+	if (time_before(send_time, forw_packet->send_time) &&
+	    time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
+					forw_packet->send_time) &&
+	    (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {
+
+		/**
+		 * check aggregation compatibility
+		 * -> direct link packets are broadcasted on
+		 *    their interface only
+		 * -> aggregate packet if the current packet is
+		 *    a "global" packet as well as the base
+		 *    packet
+		 */
+
+		/* packets without direct link flag and high TTL
+		 * are flooded through the net  */
+		if ((!directlink) &&
+		    (!(batman_packet->flags & DIRECTLINK)) &&
+		    (batman_packet->ttl != 1) &&
+
+		    /* own packets originating non-primary
+		     * interfaces leave only that interface */
+		    ((!forw_packet->own) ||
+		     (forw_packet->if_incoming->if_num == 0)))
+			return true;
+
+		/* if the incoming packet is sent via this one
+		 * interface only - we still can aggregate */
+		if ((directlink) &&
+		    (new_batman_packet->ttl == 1) &&
+		    (forw_packet->if_incoming == if_incoming) &&
+
+		    /* packets from direct neighbors or
+		     * own secondary interface packets
+		     * (= secondary interface packets in general) */
+		    (batman_packet->flags & DIRECTLINK ||
+		     (forw_packet->own &&
+		      forw_packet->if_incoming->if_num != 0)))
+			return true;
+	}
+
+	return false;
+}
+
+#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
+/* create a new aggregated packet and add this packet to it */
+static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
+				  unsigned long send_time, bool direct_link,
+				  struct batman_if *if_incoming,
+				  int own_packet)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct forw_packet *forw_packet_aggr;
+	unsigned char *skb_buff;
+
+	/* own packet should always be scheduled */
+	if (!own_packet) {
+		if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"batman packet queue full\n");
+			return;
+		}
+	}
+
+	forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+	if (!forw_packet_aggr) {
+		if (!own_packet)
+			atomic_inc(&bat_priv->batman_queue_left);
+		return;
+	}
+
+	if ((atomic_read(&bat_priv->aggregated_ogms)) &&
+	    (packet_len < MAX_AGGREGATION_BYTES))
+		forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
+						      sizeof(struct ethhdr));
+	else
+		forw_packet_aggr->skb = dev_alloc_skb(packet_len +
+						      sizeof(struct ethhdr));
+
+	if (!forw_packet_aggr->skb) {
+		if (!own_packet)
+			atomic_inc(&bat_priv->batman_queue_left);
+		kfree(forw_packet_aggr);
+		return;
+	}
+	skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr));
+
+	INIT_HLIST_NODE(&forw_packet_aggr->list);
+
+	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
+	forw_packet_aggr->packet_len = packet_len;
+	memcpy(skb_buff, packet_buff, packet_len);
+
+	forw_packet_aggr->own = own_packet;
+	forw_packet_aggr->if_incoming = if_incoming;
+	forw_packet_aggr->num_packets = 0;
+	forw_packet_aggr->direct_link_flags = 0;
+	forw_packet_aggr->send_time = send_time;
+
+	/* save packet direct link flag status */
+	if (direct_link)
+		forw_packet_aggr->direct_link_flags |= 1;
+
+	/* add new packet to packet list */
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
+	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+	/* start timer for this packet */
+	INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
+			  send_outstanding_bat_packet);
+	queue_delayed_work(bat_event_workqueue,
+			   &forw_packet_aggr->delayed_work,
+			   send_time - jiffies);
+}
+
+/* aggregate a new packet into the existing aggregation */
+static void aggregate(struct forw_packet *forw_packet_aggr,
+		      unsigned char *packet_buff,
+		      int packet_len,
+		      bool direct_link)
+{
+	unsigned char *skb_buff;
+
+	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
+	memcpy(skb_buff, packet_buff, packet_len);
+	forw_packet_aggr->packet_len += packet_len;
+	forw_packet_aggr->num_packets++;
+
+	/* save packet direct link flag status */
+	if (direct_link)
+		forw_packet_aggr->direct_link_flags |=
+			(1 << forw_packet_aggr->num_packets);
+}
+
+void add_bat_packet_to_list(struct bat_priv *bat_priv,
+			    unsigned char *packet_buff, int packet_len,
+			    struct batman_if *if_incoming, char own_packet,
+			    unsigned long send_time)
+{
+	/**
+	 * _aggr -> pointer to the packet we want to aggregate with
+	 * _pos -> pointer to the position in the queue
+	 */
+	struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
+	struct hlist_node *tmp_node;
+	struct batman_packet *batman_packet =
+		(struct batman_packet *)packet_buff;
+	bool direct_link = batman_packet->flags & DIRECTLINK ? 1 : 0;
+
+	/* find position for the packet in the forward queue */
+	spin_lock_bh(&bat_priv->forw_bat_list_lock);
+	/* own packets are not to be aggregated */
+	if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
+		hlist_for_each_entry(forw_packet_pos, tmp_node,
+				     &bat_priv->forw_bat_list, list) {
+			if (can_aggregate_with(batman_packet,
+					       packet_len,
+					       send_time,
+					       direct_link,
+					       if_incoming,
+					       forw_packet_pos)) {
+				forw_packet_aggr = forw_packet_pos;
+				break;
+			}
+		}
+	}
+
+	/* nothing to aggregate with - either aggregation disabled or no
+	 * suitable aggregation packet found */
+	if (!forw_packet_aggr) {
+		/* the following section can run without the lock */
+		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+
+		/**
+		 * if we could not aggregate this packet with one of the others
+		 * we hold it back for a while, so that it might be aggregated
+		 * later on
+		 */
+		if ((!own_packet) &&
+		    (atomic_read(&bat_priv->aggregated_ogms)))
+			send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);
+
+		new_aggregated_packet(packet_buff, packet_len,
+				      send_time, direct_link,
+				      if_incoming, own_packet);
+	} else {
+		aggregate(forw_packet_aggr,
+			  packet_buff, packet_len,
+			  direct_link);
+		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
+	}
+}
+
+/* unpack the aggregated packets and process them one by one */
+void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
+			     int packet_len, struct batman_if *if_incoming)
+{
+	struct batman_packet *batman_packet;
+	int buff_pos = 0;
+	unsigned char *hna_buff;
+
+	batman_packet = (struct batman_packet *)packet_buff;
+
+	do {
+		/* network to host order for our 32bit seqno, and the
+		   orig_interval. */
+		batman_packet->seqno = ntohl(batman_packet->seqno);
+
+		hna_buff = packet_buff + buff_pos + BAT_PACKET_LEN;
+		receive_bat_packet(ethhdr, batman_packet,
+				   hna_buff, hna_len(batman_packet),
+				   if_incoming);
+
+		buff_pos += BAT_PACKET_LEN + hna_len(batman_packet);
+		batman_packet = (struct batman_packet *)
+			(packet_buff + buff_pos);
+	} while (aggregated_packet(buff_pos, packet_len,
+				   batman_packet->num_hna));
+}

net/batman-adv/aggregation.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_AGGREGATION_H_
+#define _NET_BATMAN_ADV_AGGREGATION_H_
+
+#include "main.h"
+
+/* is there another aggregated packet here? */
+static inline int aggregated_packet(int buff_pos, int packet_len, int num_hna)
+{
+	int next_buff_pos = buff_pos + BAT_PACKET_LEN + (num_hna * ETH_ALEN);
+
+	return (next_buff_pos <= packet_len) &&
+		(next_buff_pos <= MAX_AGGREGATION_BYTES);
+}
+
+void add_bat_packet_to_list(struct bat_priv *bat_priv,
+			    unsigned char *packet_buff, int packet_len,
+			    struct batman_if *if_incoming, char own_packet,
+			    unsigned long send_time);
+void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff,
+			     int packet_len, struct batman_if *if_incoming);
+
+#endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */

net/batman-adv/bat_debugfs.c

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+
+#include <linux/debugfs.h>
+
+#include "bat_debugfs.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "soft-interface.h"
+#include "vis.h"
+#include "icmp_socket.h"
+
+static struct dentry *bat_debugfs;
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+#define LOG_BUFF_MASK (log_buff_len-1)
+#define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK])
+
+static int log_buff_len = LOG_BUF_LEN;
+
+static void emit_log_char(struct debug_log *debug_log, char c)
+{
+	LOG_BUFF(debug_log->log_end) = c;
+	debug_log->log_end++;
+
+	if (debug_log->log_end - debug_log->log_start > log_buff_len)
+		debug_log->log_start = debug_log->log_end - log_buff_len;
+}
+
+static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
+{
+	int printed_len;
+	va_list args;
+	static char debug_log_buf[256];
+	char *p;
+
+	if (!debug_log)
+		return 0;
+
+	spin_lock_bh(&debug_log->lock);
+	va_start(args, fmt);
+	printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf),
+				 fmt, args);
+	va_end(args);
+
+	for (p = debug_log_buf; *p != 0; p++)
+		emit_log_char(debug_log, *p);
+
+	spin_unlock_bh(&debug_log->lock);
+
+	wake_up(&debug_log->queue_wait);
+
+	return 0;
+}
+
+int debug_log(struct bat_priv *bat_priv, char *fmt, ...)
+{
+	va_list args;
+	char tmp_log_buf[256];
+
+	va_start(args, fmt);
+	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
+	fdebug_log(bat_priv->debug_log, "[%10u] %s",
+		   (jiffies / HZ), tmp_log_buf);
+	va_end(args);
+
+	return 0;
+}
+
+static int log_open(struct inode *inode, struct file *file)
+{
+	nonseekable_open(inode, file);
+	file->private_data = inode->i_private;
+	inc_module_count();
+	return 0;
+}
+
+static int log_release(struct inode *inode, struct file *file)
+{
+	dec_module_count();
+	return 0;
+}
+
+static ssize_t log_read(struct file *file, char __user *buf,
+			size_t count, loff_t *ppos)
+{
+	struct bat_priv *bat_priv = file->private_data;
+	struct debug_log *debug_log = bat_priv->debug_log;
+	int error, i = 0;
+	char c;
+
+	if ((file->f_flags & O_NONBLOCK) &&
+	    !(debug_log->log_end - debug_log->log_start))
+		return -EAGAIN;
+
+	if ((!buf) || (count < 0))
+		return -EINVAL;
+
+	if (count == 0)
+		return 0;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(debug_log->queue_wait,
+				(debug_log->log_start - debug_log->log_end));
+
+	if (error)
+		return error;
+
+	spin_lock_bh(&debug_log->lock);
+
+	while ((!error) && (i < count) &&
+	       (debug_log->log_start != debug_log->log_end)) {
+		c = LOG_BUFF(debug_log->log_start);
+
+		debug_log->log_start++;
+
+		spin_unlock_bh(&debug_log->lock);
+
+		error = __put_user(c, buf);
+
+		spin_lock_bh(&debug_log->lock);
+
+		buf++;
+		i++;
+
+	}
+
+	spin_unlock_bh(&debug_log->lock);
+
+	if (!error)
+		return i;
+
+	return error;
+}
+
+static unsigned int log_poll(struct file *file, poll_table *wait)
+{
+	struct bat_priv *bat_priv = file->private_data;
+	struct debug_log *debug_log = bat_priv->debug_log;
+
+	poll_wait(file, &debug_log->queue_wait, wait);
+
+	if (debug_log->log_end - debug_log->log_start)
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static const struct file_operations log_fops = {
+	.open           = log_open,
+	.release        = log_release,
+	.read           = log_read,
+	.poll           = log_poll,
+	.llseek         = no_llseek,
+};
+
+static int debug_log_setup(struct bat_priv *bat_priv)
+{
+	struct dentry *d;
+
+	if (!bat_priv->debug_dir)
+		goto err;
+
+	bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
+	if (!bat_priv->debug_log)
+		goto err;
+
+	spin_lock_init(&bat_priv->debug_log->lock);
+	init_waitqueue_head(&bat_priv->debug_log->queue_wait);
+
+	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
+				bat_priv->debug_dir, bat_priv, &log_fops);
+	if (d)
+		goto err;
+
+	return 0;
+
+err:
+	return 1;
+}
+
+static void debug_log_cleanup(struct bat_priv *bat_priv)
+{
+	kfree(bat_priv->debug_log);
+	bat_priv->debug_log = NULL;
+}
+#else /* CONFIG_BATMAN_ADV_DEBUG */
+static int debug_log_setup(struct bat_priv *bat_priv)
+{
+	bat_priv->debug_log = NULL;
+	return 0;
+}
+
+static void debug_log_cleanup(struct bat_priv *bat_priv)
+{
+	return;
+}
+#endif
+
+static int originators_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, orig_seq_print_text, net_dev);
+}
+
+static int gateways_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, gw_client_seq_print_text, net_dev);
+}
+
+static int softif_neigh_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, softif_neigh_seq_print_text, net_dev);
+}
+
+static int transtable_global_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, hna_global_seq_print_text, net_dev);
+}
+
+static int transtable_local_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, hna_local_seq_print_text, net_dev);
+}
+
+static int vis_data_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, vis_seq_print_text, net_dev);
+}
+
+struct bat_debuginfo {
+	struct attribute attr;
+	const struct file_operations fops;
+};
+
+#define BAT_DEBUGINFO(_name, _mode, _open)	\
+struct bat_debuginfo bat_debuginfo_##_name = {	\
+	.attr = { .name = __stringify(_name),	\
+		  .mode = _mode, },		\
+	.fops = { .owner = THIS_MODULE,		\
+		  .open = _open,		\
+		  .read	= seq_read,		\
+		  .llseek = seq_lseek,		\
+		  .release = single_release,	\
+		}				\
+};
+
+static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
+static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
+static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
+static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
+static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
+static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
+
+static struct bat_debuginfo *mesh_debuginfos[] = {
+	&bat_debuginfo_originators,
+	&bat_debuginfo_gateways,
+	&bat_debuginfo_softif_neigh,
+	&bat_debuginfo_transtable_global,
+	&bat_debuginfo_transtable_local,
+	&bat_debuginfo_vis_data,
+	NULL,
+};
+
+void debugfs_init(void)
+{
+	bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
+	if (bat_debugfs == ERR_PTR(-ENODEV))
+		bat_debugfs = NULL;
+}
+
+void debugfs_destroy(void)
+{
+	if (bat_debugfs) {
+		debugfs_remove_recursive(bat_debugfs);
+		bat_debugfs = NULL;
+	}
+}
+
+int debugfs_add_meshif(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+	struct bat_debuginfo **bat_debug;
+	struct dentry *file;
+
+	if (!bat_debugfs)
+		goto out;
+
+	bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
+	if (!bat_priv->debug_dir)
+		goto out;
+
+	bat_socket_setup(bat_priv);
+	debug_log_setup(bat_priv);
+
+	for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
+		file = debugfs_create_file(((*bat_debug)->attr).name,
+					  S_IFREG | ((*bat_debug)->attr).mode,
+					  bat_priv->debug_dir,
+					  dev, &(*bat_debug)->fops);
+		if (!file) {
+			bat_err(dev, "Can't add debugfs file: %s/%s\n",
+				dev->name, ((*bat_debug)->attr).name);
+			goto rem_attr;
+		}
+	}
+
+	return 0;
+rem_attr:
+	debugfs_remove_recursive(bat_priv->debug_dir);
+	bat_priv->debug_dir = NULL;
+out:
+#ifdef CONFIG_DEBUG_FS
+	return -ENOMEM;
+#else
+	return 0;
+#endif /* CONFIG_DEBUG_FS */
+}
+
+void debugfs_del_meshif(struct net_device *dev)
+{
+	struct bat_priv *bat_priv = netdev_priv(dev);
+
+	debug_log_cleanup(bat_priv);
+
+	if (bat_debugfs) {
+		debugfs_remove_recursive(bat_priv->debug_dir);
+		bat_priv->debug_dir = NULL;
+	}
+}

net/batman-adv/bat_debugfs.h

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+
+#ifndef _NET_BATMAN_ADV_DEBUGFS_H_
+#define _NET_BATMAN_ADV_DEBUGFS_H_
+
+#define DEBUGFS_BAT_SUBDIR "batman_adv"
+
+void debugfs_init(void);
+void debugfs_destroy(void);
+int debugfs_add_meshif(struct net_device *dev);
+void debugfs_del_meshif(struct net_device *dev);
+
+#endif /* _NET_BATMAN_ADV_DEBUGFS_H_ */

net/batman-adv/bat_sysfs.h

+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+
+#ifndef _NET_BATMAN_ADV_SYSFS_H_
+#define _NET_BATMAN_ADV_SYSFS_H_
+
+#define SYSFS_IF_MESH_SUBDIR "mesh"
+#define SYSFS_IF_BAT_SUBDIR "batman_adv"
+
+struct bat_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
+			char *buf);
+	ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
+			 char *buf, size_t count);
+};
+
+int sysfs_add_meshif(struct net_device *dev);
+void sysfs_del_meshif(struct net_device *dev);
+int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev);
+void sysfs_del_hardif(struct kobject **hardif_obj);
+
+#endif /* _NET_BATMAN_ADV_SYSFS_H_ */

net/batman-adv/bitarray.c

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bitarray.h"
+
+#include <linux/bitops.h>
+
+/* returns true if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno */
+uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
+		       uint32_t curr_seqno)
+{
+	int32_t diff, word_offset, word_num;
+
+	diff = last_seqno - curr_seqno;
+	if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE) {
+		return 0;
+	} else {
+		/* which word */
+		word_num = (last_seqno - curr_seqno) / WORD_BIT_SIZE;
+		/* which position in the selected word */
+		word_offset = (last_seqno - curr_seqno) % WORD_BIT_SIZE;
+
+		if (test_bit(word_offset, &seq_bits[word_num]))
+			return 1;
+		else
+			return 0;
+	}
+}
+
+/* turn corresponding bit on, so we can remember that we got the packet */
+void bit_mark(unsigned long *seq_bits, int32_t n)
+{
+	int32_t word_offset, word_num;
+
+	/* if too old, just drop it */
+	if (n < 0 || n >= TQ_LOCAL_WINDOW_SIZE)
+		return;
+
+	/* which word */
+	word_num = n / WORD_BIT_SIZE;
+	/* which position in the selected word */
+	word_offset = n % WORD_BIT_SIZE;
+
+	set_bit(word_offset, &seq_bits[word_num]); /* turn the position on */
+}
+
+/* shift the packet array by n places. */
+static void bit_shift(unsigned long *seq_bits, int32_t n)
+{
+	int32_t word_offset, word_num;
+	int32_t i;
+
+	if (n <= 0 || n >= TQ_LOCAL_WINDOW_SIZE)
+		return;
+
+	word_offset = n % WORD_BIT_SIZE;/* shift how much inside each word */
+	word_num = n / WORD_BIT_SIZE;	/* shift over how much (full) words */
+
+	for (i = NUM_WORDS - 1; i > word_num; i--) {
+		/* going from old to new, so we don't overwrite the data we copy
+		 * from.
+		 *
+		 * left is high, right is low: FEDC BA98 7654 3210
+		 *					  ^^ ^^
+		 *			       vvvv
+		 * ^^^^ = from, vvvvv =to, we'd have word_num==1 and
+		 * word_offset==WORD_BIT_SIZE/2 ????? in this example.
+		 * (=24 bits)
+		 *
+		 * our desired output would be: 9876 5432 1000 0000
+		 * */
+
+		seq_bits[i] =
+			(seq_bits[i - word_num] << word_offset) +
+			/* take the lower port from the left half, shift it left
+			 * to its final position */
+			(seq_bits[i - word_num - 1] >>
+			 (WORD_BIT_SIZE-word_offset));
+		/* and the upper part of the right half and shift it left to
+		 * it's position */
+		/* for our example that would be: word[0] = 9800 + 0076 =
+		 * 9876 */
+	}
+	/* now for our last word, i==word_num, we only have the it's "left"
+	 * half. that's the 1000 word in our example.*/
+
+	seq_bits[i] = (seq_bits[i - word_num] << word_offset);
+
+	/* pad the rest with 0, if there is anything */
+	i--;
+
+	for (; i >= 0; i--)
+		seq_bits[i] = 0;
+}
+
+static void bit_reset_window(unsigned long *seq_bits)
+{
+	int i;
+	for (i = 0; i < NUM_WORDS; i++)
+		seq_bits[i] = 0;
+}
+
+
+/* receive and process one packet within the sequence number window.
+ *
+ * returns:
+ *  1 if the window was moved (either new or very old)
+ *  0 if the window was not moved/shifted.
+ */
+char bit_get_packet(void *priv, unsigned long *seq_bits,
+		    int32_t seq_num_diff, int8_t set_mark)
+{
+	struct bat_priv *bat_priv = (struct bat_priv *)priv;
+
+	/* sequence number is slightly older. We already got a sequence number
+	 * higher than this one, so we just mark it. */
+
+	if ((seq_num_diff <= 0) && (seq_num_diff > -TQ_LOCAL_WINDOW_SIZE)) {
+		if (set_mark)
+			bit_mark(seq_bits, -seq_num_diff);
+		return 0;
+	}
+
+	/* sequence number is slightly newer, so we shift the window and
+	 * set the mark if required */
+
+	if ((seq_num_diff > 0) && (seq_num_diff < TQ_LOCAL_WINDOW_SIZE)) {
+		bit_shift(seq_bits, seq_num_diff);
+
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+		return 1;
+	}
+
+	/* sequence number is much newer, probably missed a lot of packets */
+
+	if ((seq_num_diff >= TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff < EXPECTED_SEQNO_RANGE)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"We missed a lot of packets (%i) !\n",
+			seq_num_diff - 1);
+		bit_reset_window(seq_bits);
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+		return 1;
+	}
+
+	/* received a much older packet. The other host either restarted
+	 * or the old packet got delayed somewhere in the network. The
+	 * packet should be dropped without calling this function if the
+	 * seqno window is protected. */
+
+	if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
+
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Other host probably restarted!\n");
+
+		bit_reset_window(seq_bits);
+		if (set_mark)
+			bit_mark(seq_bits, 0);
+
+		return 1;
+	}
+
+	/* never reached */
+	return 0;
+}
+
+/* count the hamming weight, how many good packets did we receive? just count
+ * the 1's.
+ */
+int bit_packet_count(unsigned long *seq_bits)
+{
+	int i, hamming = 0;
+
+	for (i = 0; i < NUM_WORDS; i++)
+		hamming += hweight_long(seq_bits[i]);
+
+	return hamming;
+}

net/batman-adv/bitarray.h

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_BITARRAY_H_
+#define _NET_BATMAN_ADV_BITARRAY_H_
+
+#define WORD_BIT_SIZE (sizeof(unsigned long) * 8)
+
+/* returns true if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno */
+uint8_t get_bit_status(unsigned long *seq_bits, uint32_t last_seqno,
+					   uint32_t curr_seqno);
+
+/* turn corresponding bit on, so we can remember that we got the packet */
+void bit_mark(unsigned long *seq_bits, int32_t n);
+
+
+/* receive and process one packet, returns 1 if received seq_num is considered
+ * new, 0 if old  */
+char bit_get_packet(void *priv, unsigned long *seq_bits,
+		    int32_t seq_num_diff, int8_t set_mark);
+
+/* count the hamming weight, how many good packets did we receive? */
+int  bit_packet_count(unsigned long *seq_bits);
+
+#endif /* _NET_BATMAN_ADV_BITARRAY_H_ */

net/batman-adv/gateway_client.h

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_GATEWAY_CLIENT_H_
+#define _NET_BATMAN_ADV_GATEWAY_CLIENT_H_
+
+void gw_deselect(struct bat_priv *bat_priv);
+void gw_election(struct bat_priv *bat_priv);
+void *gw_get_selected(struct bat_priv *bat_priv);
+void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node);
+void gw_node_update(struct bat_priv *bat_priv,
+		    struct orig_node *orig_node, uint8_t new_gwflags);
+void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node);
+void gw_node_purge(struct bat_priv *bat_priv);
+int gw_client_seq_print_text(struct seq_file *seq, void *offset);
+int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb);
+
+#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */

net/batman-adv/gateway_common.c

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+
+/* calculates the gateway class from kbit */
+static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class)
+{
+	int mdown = 0, tdown, tup, difference;
+	uint8_t sbit, part;
+
+	*gw_srv_class = 0;
+	difference = 0x0FFFFFFF;
+
+	/* test all downspeeds */
+	for (sbit = 0; sbit < 2; sbit++) {
+		for (part = 0; part < 16; part++) {
+			tdown = 32 * (sbit + 2) * (1 << part);
+
+			if (abs(tdown - down) < difference) {
+				*gw_srv_class = (sbit << 7) + (part << 3);
+				difference = abs(tdown - down);
+				mdown = tdown;
+			}
+		}
+	}
+
+	/* test all upspeeds */
+	difference = 0x0FFFFFFF;
+
+	for (part = 0; part < 8; part++) {
+		tup = ((part + 1) * (mdown)) / 8;
+
+		if (abs(tup - up) < difference) {
+			*gw_srv_class = (*gw_srv_class & 0xF8) | part;
+			difference = abs(tup - up);
+		}
+	}
+}
+
+/* returns the up and downspeeds in kbit, calculated from the class */
+void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up)
+{
+	char sbit = (gw_srv_class & 0x80) >> 7;
+	char dpart = (gw_srv_class & 0x78) >> 3;
+	char upart = (gw_srv_class & 0x07);
+
+	if (!gw_srv_class) {
+		*down = 0;
+		*up = 0;
+		return;
+	}
+
+	*down = 32 * (sbit + 2) * (1 << dpart);
+	*up = ((upart + 1) * (*down)) / 8;
+}
+
+static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff,
+			       long *up, long *down)
+{
+	int ret, multi = 1;
+	char *slash_ptr, *tmp_ptr;
+
+	slash_ptr = strchr(buff, '/');
+	if (slash_ptr)
+		*slash_ptr = 0;
+
+	if (strlen(buff) > 4) {
+		tmp_ptr = buff + strlen(buff) - 4;
+
+		if (strnicmp(tmp_ptr, "mbit", 4) == 0)
+			multi = 1024;
+
+		if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
+			(multi > 1))
+			*tmp_ptr = '\0';
+	}
+
+	ret = strict_strtoul(buff, 10, down);
+	if (ret) {
+		bat_err(net_dev,
+			"Download speed of gateway mode invalid: %s\n",
+			buff);
+		return false;
+	}
+
+	*down *= multi;
+
+	/* we also got some upload info */
+	if (slash_ptr) {
+		multi = 1;
+
+		if (strlen(slash_ptr + 1) > 4) {
+			tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
+
+			if (strnicmp(tmp_ptr, "mbit", 4) == 0)
+				multi = 1024;
+
+			if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
+				(multi > 1))
+				*tmp_ptr = '\0';
+		}
+
+		ret = strict_strtoul(slash_ptr + 1, 10, up);
+		if (ret) {
+			bat_err(net_dev,
+				"Upload speed of gateway mode invalid: "
+				"%s\n", slash_ptr + 1);
+			return false;
+		}
+
+		*up *= multi;
+	}
+
+	return true;
+}
+
+ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
+{
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	long gw_bandwidth_tmp = 0, up = 0, down = 0;
+	bool ret;
+
+	ret = parse_gw_bandwidth(net_dev, buff, &up, &down);
+	if (!ret)
+		goto end;
+
+	if ((!down) || (down < 256))
+		down = 2000;
+
+	if (!up)
+		up = down / 5;
+
+	kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp);
+
+	/**
+	 * the gw bandwidth we guessed above might not match the given
+	 * speeds, hence we need to calculate it back to show the number
+	 * that is going to be propagated
+	 **/
+	gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp,
+			     (int *)&down, (int *)&up);
+
+	gw_deselect(bat_priv);
+	bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' "
+		 "(propagating: %ld%s/%ld%s)\n",
+		 atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp,
+		 (down > 2048 ? down / 1024 : down),
+		 (down > 2048 ? "MBit" : "KBit"),
+		 (up > 2048 ? up / 1024 : up),
+		 (up > 2048 ? "MBit" : "KBit"));
+
+	atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp);
+
+end:
+	return count;
+}

net/batman-adv/gateway_common.h

+/*
+ * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_GATEWAY_COMMON_H_
+#define _NET_BATMAN_ADV_GATEWAY_COMMON_H_
+
+enum gw_modes {
+	GW_MODE_OFF,
+	GW_MODE_CLIENT,
+	GW_MODE_SERVER,
+};
+
+#define GW_MODE_OFF_NAME	"off"
+#define GW_MODE_CLIENT_NAME	"client"
+#define GW_MODE_SERVER_NAME	"server"
+
+void gw_bandwidth_to_kbit(uint8_t gw_class, int *down, int *up);
+ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count);
+
+#endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */

net/batman-adv/hard-interface.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_HARD_INTERFACE_H_
+#define _NET_BATMAN_ADV_HARD_INTERFACE_H_
+
+#define IF_NOT_IN_USE 0
+#define IF_TO_BE_REMOVED 1
+#define IF_INACTIVE 2
+#define IF_ACTIVE 3
+#define IF_TO_BE_ACTIVATED 4
+#define IF_I_WANT_YOU 5
+
+extern struct notifier_block hard_if_notifier;
+
+struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev);
+int hardif_enable_interface(struct batman_if *batman_if, char *iface_name);
+void hardif_disable_interface(struct batman_if *batman_if);
+void hardif_remove_interfaces(void);
+int batman_skb_recv(struct sk_buff *skb,
+				struct net_device *dev,
+				struct packet_type *ptype,
+				struct net_device *orig_dev);
+int hardif_min_mtu(struct net_device *soft_iface);
+void update_min_mtu(struct net_device *soft_iface);
+
+static inline void hardif_free_ref(struct kref *refcount)
+{
+	struct batman_if *batman_if;
+
+	batman_if = container_of(refcount, struct batman_if, refcount);
+	kfree(batman_if);
+}
+
+#endif /* _NET_BATMAN_ADV_HARD_INTERFACE_H_ */

net/batman-adv/hash.c

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "hash.h"
+
+/* clears the hash */
+static void hash_init(struct hashtable_t *hash)
+{
+	int i;
+
+	for (i = 0 ; i < hash->size; i++)
+		INIT_HLIST_HEAD(&hash->table[i]);
+}
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash)
+{
+	kfree(hash->table);
+	kfree(hash);
+}
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(int size)
+{
+	struct hashtable_t *hash;
+
+	hash = kmalloc(sizeof(struct hashtable_t) , GFP_ATOMIC);
+
+	if (!hash)
+		return NULL;
+
+	hash->size = size;
+	hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
+
+	if (!hash->table) {
+		kfree(hash);
+		return NULL;
+	}
+
+	hash_init(hash);
+
+	return hash;
+}

net/batman-adv/hash.h

+/*
+ * Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_HASH_H_
+#define _NET_BATMAN_ADV_HASH_H_
+
+#include <linux/list.h>
+
+/* callback to a compare function.  should
+ * compare 2 element datas for their keys,
+ * return 0 if same and not 0 if not
+ * same */
+typedef int (*hashdata_compare_cb)(void *, void *);
+
+/* the hashfunction, should return an index
+ * based on the key in the data of the first
+ * argument and the size the second */
+typedef int (*hashdata_choose_cb)(void *, int);
+typedef void (*hashdata_free_cb)(void *, void *);
+
+struct element_t {
+	void *data;		/* pointer to the data */
+	struct hlist_node hlist;	/* bucket list pointer */
+};
+
+struct hashtable_t {
+	struct hlist_head *table;   /* the hashtable itself, with the buckets */
+	int size;		    /* size of hashtable */
+};
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(int size);
+
+/* remove element if you already found the element you want to delete and don't
+ * need the overhead to find it again with hash_remove().  But usually, you
+ * don't want to use this function, as it fiddles with hash-internals. */
+void *hash_remove_element(struct hashtable_t *hash, struct element_t *elem);
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash);
+
+/* remove the hash structure. if hashdata_free_cb != NULL, this function will be
+ * called to remove the elements inside of the hash.  if you don't remove the
+ * elements, memory might be leaked. */
+static inline void hash_delete(struct hashtable_t *hash,
+			       hashdata_free_cb free_cb, void *arg)
+{
+	struct hlist_head *head;
+	struct hlist_node *walk, *safe;
+	struct element_t *bucket;
+	int i;
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_safe(walk, safe, head) {
+			bucket = hlist_entry(walk, struct element_t, hlist);
+			if (free_cb)
+				free_cb(bucket->data, arg);
+
+			hlist_del(walk);
+			kfree(bucket);
+		}
+	}
+
+	hash_destroy(hash);
+}
+
+/* adds data to the hashtable. returns 0 on success, -1 on error */
+static inline int hash_add(struct hashtable_t *hash,
+			   hashdata_compare_cb compare,
+			   hashdata_choose_cb choose, void *data)
+{
+	int index;
+	struct hlist_head *head;
+	struct hlist_node *walk, *safe;
+	struct element_t *bucket;
+
+	if (!hash)
+		return -1;
+
+	index = choose(data, hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each_safe(walk, safe, head) {
+		bucket = hlist_entry(walk, struct element_t, hlist);
+		if (compare(bucket->data, data))
+			return -1;
+	}
+
+	/* no duplicate found in list, add new element */
+	bucket = kmalloc(sizeof(struct element_t), GFP_ATOMIC);
+
+	if (!bucket)
+		return -1;
+
+	bucket->data = data;
+	hlist_add_head(&bucket->hlist, head);
+
+	return 0;
+}
+
+/* removes data from hash, if found. returns pointer do data on success, so you
+ * can remove the used structure yourself, or NULL on error .  data could be the
+ * structure you use with just the key filled, we just need the key for
+ * comparing. */
+static inline void *hash_remove(struct hashtable_t *hash,
+				hashdata_compare_cb compare,
+				hashdata_choose_cb choose, void *data)
+{
+	size_t index;
+	struct hlist_node *walk;
+	struct element_t *bucket;
+	struct hlist_head *head;
+	void *data_save;
+
+	index = choose(data, hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each_entry(bucket, walk, head, hlist) {
+		if (compare(bucket->data, data)) {
+			data_save = bucket->data;
+			hlist_del(walk);
+			kfree(bucket);
+			return data_save;
+		}
+	}
+
+	return NULL;
+}
+
+/* finds data, based on the key in keydata. returns the found data on success,
+ * or NULL on error */
+static inline void *hash_find(struct hashtable_t *hash,
+			      hashdata_compare_cb compare,
+			      hashdata_choose_cb choose, void *keydata)
+{
+	int index;
+	struct hlist_head *head;
+	struct hlist_node *walk;
+	struct element_t *bucket;
+
+	if (!hash)
+		return NULL;
+
+	index = choose(keydata , hash->size);
+	head = &hash->table[index];
+
+	hlist_for_each(walk, head) {
+		bucket = hlist_entry(walk, struct element_t, hlist);
+		if (compare(bucket->data, keydata))
+			return bucket->data;
+	}
+
+	return NULL;
+}
+
+#endif /* _NET_BATMAN_ADV_HASH_H_ */

net/batman-adv/icmp_socket.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include "icmp_socket.h"
+#include "send.h"
+#include "types.h"
+#include "hash.h"
+#include "originator.h"
+#include "hard-interface.h"
+
+static struct socket_client *socket_client_hash[256];
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+				  struct icmp_packet_rr *icmp_packet,
+				  size_t icmp_len);
+
+void bat_socket_init(void)
+{
+	memset(socket_client_hash, 0, sizeof(socket_client_hash));
+}
+
+static int bat_socket_open(struct inode *inode, struct file *file)
+{
+	unsigned int i;
+	struct socket_client *socket_client;
+
+	nonseekable_open(inode, file);
+
+	socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
+
+	if (!socket_client)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
+		if (!socket_client_hash[i]) {
+			socket_client_hash[i] = socket_client;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(socket_client_hash)) {
+		pr_err("Error - can't add another packet client: "
+		       "maximum number of clients reached\n");
+		kfree(socket_client);
+		return -EXFULL;
+	}
+
+	INIT_LIST_HEAD(&socket_client->queue_list);
+	socket_client->queue_len = 0;
+	socket_client->index = i;
+	socket_client->bat_priv = inode->i_private;
+	spin_lock_init(&socket_client->lock);
+	init_waitqueue_head(&socket_client->queue_wait);
+
+	file->private_data = socket_client;
+
+	inc_module_count();
+	return 0;
+}
+
+static int bat_socket_release(struct inode *inode, struct file *file)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct socket_packet *socket_packet;
+	struct list_head *list_pos, *list_pos_tmp;
+
+	spin_lock_bh(&socket_client->lock);
+
+	/* for all packets in the queue ... */
+	list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
+		socket_packet = list_entry(list_pos,
+					   struct socket_packet, list);
+
+		list_del(list_pos);
+		kfree(socket_packet);
+	}
+
+	socket_client_hash[socket_client->index] = NULL;
+	spin_unlock_bh(&socket_client->lock);
+
+	kfree(socket_client);
+	dec_module_count();
+
+	return 0;
+}
+
+static ssize_t bat_socket_read(struct file *file, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct socket_packet *socket_packet;
+	size_t packet_len;
+	int error;
+
+	if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
+		return -EAGAIN;
+
+	if ((!buf) || (count < sizeof(struct icmp_packet)))
+		return -EINVAL;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(socket_client->queue_wait,
+					 socket_client->queue_len);
+
+	if (error)
+		return error;
+
+	spin_lock_bh(&socket_client->lock);
+
+	socket_packet = list_first_entry(&socket_client->queue_list,
+					 struct socket_packet, list);
+	list_del(&socket_packet->list);
+	socket_client->queue_len--;
+
+	spin_unlock_bh(&socket_client->lock);
+
+	error = __copy_to_user(buf, &socket_packet->icmp_packet,
+			       socket_packet->icmp_len);
+
+	packet_len = socket_packet->icmp_len;
+	kfree(socket_packet);
+
+	if (error)
+		return -EFAULT;
+
+	return packet_len;
+}
+
+static ssize_t bat_socket_write(struct file *file, const char __user *buff,
+				size_t len, loff_t *off)
+{
+	struct socket_client *socket_client = file->private_data;
+	struct bat_priv *bat_priv = socket_client->bat_priv;
+	struct sk_buff *skb;
+	struct icmp_packet_rr *icmp_packet;
+
+	struct orig_node *orig_node;
+	struct batman_if *batman_if;
+	size_t packet_len = sizeof(struct icmp_packet);
+	uint8_t dstaddr[ETH_ALEN];
+
+	if (len < sizeof(struct icmp_packet)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"invalid packet size\n");
+		return -EINVAL;
+	}
+
+	if (!bat_priv->primary_if)
+		return -EFAULT;
+
+	if (len >= sizeof(struct icmp_packet_rr))
+		packet_len = sizeof(struct icmp_packet_rr);
+
+	skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_reserve(skb, sizeof(struct ethhdr));
+	icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
+
+	if (!access_ok(VERIFY_READ, buff, packet_len)) {
+		len = -EFAULT;
+		goto free_skb;
+	}
+
+	if (__copy_from_user(icmp_packet, buff, packet_len)) {
+		len = -EFAULT;
+		goto free_skb;
+	}
+
+	if (icmp_packet->packet_type != BAT_ICMP) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"got bogus packet type (expected: BAT_ICMP)\n");
+		len = -EINVAL;
+		goto free_skb;
+	}
+
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Error - can't send packet from char device: "
+			"got bogus message type (expected: ECHO_REQUEST)\n");
+		len = -EINVAL;
+		goto free_skb;
+	}
+
+	icmp_packet->uid = socket_client->index;
+
+	if (icmp_packet->version != COMPAT_VERSION) {
+		icmp_packet->msg_type = PARAMETER_PROBLEM;
+		icmp_packet->ttl = COMPAT_VERSION;
+		bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+		goto free_skb;
+	}
+
+	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
+		goto dst_unreach;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   icmp_packet->dst));
+
+	if (!orig_node)
+		goto unlock;
+
+	if (!orig_node->router)
+		goto unlock;
+
+	batman_if = orig_node->router->if_incoming;
+	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	if (!batman_if)
+		goto dst_unreach;
+
+	if (batman_if->if_status != IF_ACTIVE)
+		goto dst_unreach;
+
+	memcpy(icmp_packet->orig,
+	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+
+	if (packet_len == sizeof(struct icmp_packet_rr))
+		memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
+
+
+	send_skb_packet(skb, batman_if, dstaddr);
+
+	goto out;
+
+unlock:
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+dst_unreach:
+	icmp_packet->msg_type = DESTINATION_UNREACHABLE;
+	bat_socket_add_packet(socket_client, icmp_packet, packet_len);
+free_skb:
+	kfree_skb(skb);
+out:
+	return len;
+}
+
+static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
+{
+	struct socket_client *socket_client = file->private_data;
+
+	poll_wait(file, &socket_client->queue_wait, wait);
+
+	if (socket_client->queue_len > 0)
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static const struct file_operations fops = {
+	.owner = THIS_MODULE,
+	.open = bat_socket_open,
+	.release = bat_socket_release,
+	.read = bat_socket_read,
+	.write = bat_socket_write,
+	.poll = bat_socket_poll,
+	.llseek = no_llseek,
+};
+
+int bat_socket_setup(struct bat_priv *bat_priv)
+{
+	struct dentry *d;
+
+	if (!bat_priv->debug_dir)
+		goto err;
+
+	d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
+				bat_priv->debug_dir, bat_priv, &fops);
+	if (d)
+		goto err;
+
+	return 0;
+
+err:
+	return 1;
+}
+
+static void bat_socket_add_packet(struct socket_client *socket_client,
+				  struct icmp_packet_rr *icmp_packet,
+				  size_t icmp_len)
+{
+	struct socket_packet *socket_packet;
+
+	socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
+
+	if (!socket_packet)
+		return;
+
+	INIT_LIST_HEAD(&socket_packet->list);
+	memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
+	socket_packet->icmp_len = icmp_len;
+
+	spin_lock_bh(&socket_client->lock);
+
+	/* while waiting for the lock the socket_client could have been
+	 * deleted */
+	if (!socket_client_hash[icmp_packet->uid]) {
+		spin_unlock_bh(&socket_client->lock);
+		kfree(socket_packet);
+		return;
+	}
+
+	list_add_tail(&socket_packet->list, &socket_client->queue_list);
+	socket_client->queue_len++;
+
+	if (socket_client->queue_len > 100) {
+		socket_packet = list_first_entry(&socket_client->queue_list,
+						 struct socket_packet, list);
+
+		list_del(&socket_packet->list);
+		kfree(socket_packet);
+		socket_client->queue_len--;
+	}
+
+	spin_unlock_bh(&socket_client->lock);
+
+	wake_up(&socket_client->queue_wait);
+}
+
+void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
+			       size_t icmp_len)
+{
+	struct socket_client *hash = socket_client_hash[icmp_packet->uid];
+
+	if (hash)
+		bat_socket_add_packet(hash, icmp_packet, icmp_len);
+}

net/batman-adv/icmp_socket.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_ICMP_SOCKET_H_
+#define _NET_BATMAN_ADV_ICMP_SOCKET_H_
+
+#include "types.h"
+
+#define ICMP_SOCKET "socket"
+
+void bat_socket_init(void);
+int bat_socket_setup(struct bat_priv *bat_priv);
+void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
+			       size_t icmp_len);
+
+#endif /* _NET_BATMAN_ADV_ICMP_SOCKET_H_ */

net/batman-adv/main.c

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bat_sysfs.h"
+#include "bat_debugfs.h"
+#include "routing.h"
+#include "send.h"
+#include "originator.h"
+#include "soft-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "hard-interface.h"
+#include "gateway_client.h"
+#include "types.h"
+#include "vis.h"
+#include "hash.h"
+
+struct list_head if_list;
+
+unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
+struct workqueue_struct *bat_event_workqueue;
+
+static int __init batman_init(void)
+{
+	INIT_LIST_HEAD(&if_list);
+
+	/* the name should not be longer than 10 chars - see
+	 * http://lwn.net/Articles/23634/ */
+	bat_event_workqueue = create_singlethread_workqueue("bat_events");
+
+	if (!bat_event_workqueue)
+		return -ENOMEM;
+
+	bat_socket_init();
+	debugfs_init();
+
+	register_netdevice_notifier(&hard_if_notifier);
+
+	pr_info("B.A.T.M.A.N. advanced %s%s (compatibility version %i) "
+		"loaded\n", SOURCE_VERSION, REVISION_VERSION_STR,
+		COMPAT_VERSION);
+
+	return 0;
+}
+
+static void __exit batman_exit(void)
+{
+	debugfs_destroy();
+	unregister_netdevice_notifier(&hard_if_notifier);
+	hardif_remove_interfaces();
+
+	flush_workqueue(bat_event_workqueue);
+	destroy_workqueue(bat_event_workqueue);
+	bat_event_workqueue = NULL;
+
+	rcu_barrier();
+}
+
+int mesh_init(struct net_device *soft_iface)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+	spin_lock_init(&bat_priv->orig_hash_lock);
+	spin_lock_init(&bat_priv->forw_bat_list_lock);
+	spin_lock_init(&bat_priv->forw_bcast_list_lock);
+	spin_lock_init(&bat_priv->hna_lhash_lock);
+	spin_lock_init(&bat_priv->hna_ghash_lock);
+	spin_lock_init(&bat_priv->gw_list_lock);
+	spin_lock_init(&bat_priv->vis_hash_lock);
+	spin_lock_init(&bat_priv->vis_list_lock);
+	spin_lock_init(&bat_priv->softif_neigh_lock);
+
+	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
+	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
+	INIT_HLIST_HEAD(&bat_priv->gw_list);
+	INIT_HLIST_HEAD(&bat_priv->softif_neigh_list);
+
+	if (originator_init(bat_priv) < 1)
+		goto err;
+
+	if (hna_local_init(bat_priv) < 1)
+		goto err;
+
+	if (hna_global_init(bat_priv) < 1)
+		goto err;
+
+	hna_local_add(soft_iface, soft_iface->dev_addr);
+
+	if (vis_init(bat_priv) < 1)
+		goto err;
+
+	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
+	goto end;
+
+err:
+	pr_err("Unable to allocate memory for mesh information structures: "
+	       "out of mem ?\n");
+	mesh_free(soft_iface);
+	return -1;
+
+end:
+	return 0;
+}
+
+void mesh_free(struct net_device *soft_iface)
+{
+	struct bat_priv *bat_priv = netdev_priv(soft_iface);
+
+	atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
+
+	purge_outstanding_packets(bat_priv, NULL);
+
+	vis_quit(bat_priv);
+
+	gw_node_purge(bat_priv);
+	originator_free(bat_priv);
+
+	hna_local_free(bat_priv);
+	hna_global_free(bat_priv);
+
+	softif_neigh_purge(bat_priv);
+
+	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
+}
+
+void inc_module_count(void)
+{
+	try_module_get(THIS_MODULE);
+}
+
+void dec_module_count(void)
+{
+	module_put(THIS_MODULE);
+}
+
+int is_my_mac(uint8_t *addr)
+{
+	struct batman_if *batman_if;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->if_status != IF_ACTIVE)
+			continue;
+
+		if (compare_orig(batman_if->net_dev->dev_addr, addr)) {
+			rcu_read_unlock();
+			return 1;
+		}
+	}
+	rcu_read_unlock();
+	return 0;
+
+}
+
+module_init(batman_init);
+module_exit(batman_exit);
+
+MODULE_LICENSE("GPL");
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
+#ifdef REVISION_VERSION
+MODULE_VERSION(SOURCE_VERSION "-" REVISION_VERSION);
+#else
+MODULE_VERSION(SOURCE_VERSION);
+#endif

net/batman-adv/main.h

+/*
+ * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#ifndef _NET_BATMAN_ADV_MAIN_H_
+#define _NET_BATMAN_ADV_MAIN_H_
+
+/* Kernel Programming */
+#define LINUX
+
+#define DRIVER_AUTHOR "Marek Lindner <lindner_marek@yahoo.de>, " \
+		      "Simon Wunderlich <siwu@hrz.tu-chemnitz.de>"
+#define DRIVER_DESC   "B.A.T.M.A.N. advanced"
+#define DRIVER_DEVICE "batman-adv"
+
+#define SOURCE_VERSION "next"
+
+
+/* B.A.T.M.A.N. parameters */
+
+#define TQ_MAX_VALUE 255
+#define JITTER 20
+#define TTL 50			  /* Time To Live of broadcast messages */
+
+#define PURGE_TIMEOUT 200	/* purge originators after time in seconds if no
+				   * valid packet comes in -> TODO: check
+				   * influence on TQ_LOCAL_WINDOW_SIZE */
+#define LOCAL_HNA_TIMEOUT 3600 /* in seconds */
+
+#define TQ_LOCAL_WINDOW_SIZE 64	  /* sliding packet range of received originator
+				   * messages in squence numbers (should be a
+				   * multiple of our word size) */
+#define TQ_GLOBAL_WINDOW_SIZE 5
+#define TQ_LOCAL_BIDRECT_SEND_MINIMUM 1
+#define TQ_LOCAL_BIDRECT_RECV_MINIMUM 1
+#define TQ_TOTAL_BIDRECT_LIMIT 1
+
+#define NUM_WORDS (TQ_LOCAL_WINDOW_SIZE / WORD_BIT_SIZE)
+
+#define PACKBUFF_SIZE 2000
+#define LOG_BUF_LEN 8192	  /* has to be a power of 2 */
+
+#define VIS_INTERVAL 5000	/* 5 seconds */
+
+/* how much worse secondary interfaces may be to
+ * to be considered as bonding candidates */
+
+#define BONDING_TQ_THRESHOLD	50
+
+#define MAX_AGGREGATION_BYTES 512 /* should not be bigger than 512 bytes or
+				   * change the size of
+				   * forw_packet->direct_link_flags */
+#define MAX_AGGREGATION_MS 100
+
+#define SOFTIF_NEIGH_TIMEOUT 180000 /* 3 minutes */
+
+#define RESET_PROTECTION_MS 30000
+#define EXPECTED_SEQNO_RANGE	65536
+/* don't reset again within 30 seconds */
+
+#define MESH_INACTIVE 0
+#define MESH_ACTIVE 1
+#define MESH_DEACTIVATING 2
+
+#define BCAST_QUEUE_LEN		256
+#define BATMAN_QUEUE_LEN	256
+
+/*
+ * Debug Messages
+ */
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt /* Append 'batman-adv: ' before
+					     * kernel messages */
+
+#define DBG_BATMAN 1	/* all messages related to routing / flooding /
+			 * broadcasting / etc */
+#define DBG_ROUTES 2	/* route or hna added / changed / deleted */
+#define DBG_ALL 3
+
+#define LOG_BUF_LEN 8192          /* has to be a power of 2 */
+
+
+/*
+ *  Vis
+ */
+
+/* #define VIS_SUBCLUSTERS_DISABLED */
+
+/*
+ * Kernel headers
+ */
+
+#include <linux/mutex.h>	/* mutex */
+#include <linux/module.h>	/* needed by all modules */
+#include <linux/netdevice.h>	/* netdevice */
+#include <linux/etherdevice.h>  /* ethernet address classifaction */
+#include <linux/if_ether.h>	/* ethernet header */
+#include <linux/poll.h>		/* poll_table */
+#include <linux/kthread.h>	/* kernel threads */
+#include <linux/pkt_sched.h>	/* schedule types */
+#include <linux/workqueue.h>	/* workqueue */
+#include <linux/slab.h>
+#include <net/sock.h>		/* struct sock */
+#include <linux/jiffies.h>
+#include <linux/seq_file.h>
+#include "types.h"
+
+#ifndef REVISION_VERSION
+#define REVISION_VERSION_STR ""
+#else
+#define REVISION_VERSION_STR " "REVISION_VERSION
+#endif
+
+extern struct list_head if_list;
+
+extern unsigned char broadcast_addr[];
+extern struct workqueue_struct *bat_event_workqueue;
+
+int mesh_init(struct net_device *soft_iface);
+void mesh_free(struct net_device *soft_iface);
+void inc_module_count(void);
+void dec_module_count(void);
+int is_my_mac(uint8_t *addr);
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+int debug_log(struct bat_priv *bat_priv, char *fmt, ...);
+
+#define bat_dbg(type, bat_priv, fmt, arg...)			\
+	do {							\
+		if (atomic_read(&bat_priv->log_level) & type)	\
+			debug_log(bat_priv, fmt, ## arg);	\
+	}							\
+	while (0)
+#else /* !CONFIG_BATMAN_ADV_DEBUG */
+static inline void bat_dbg(char type __attribute__((unused)),
+			   struct bat_priv *bat_priv __attribute__((unused)),
+			   char *fmt __attribute__((unused)), ...)
+{
+}
+#endif
+
+#define bat_warning(net_dev, fmt, arg...)				\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_warning("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+#define bat_info(net_dev, fmt, arg...)					\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_info("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+#define bat_err(net_dev, fmt, arg...)					\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct bat_priv *_batpriv = netdev_priv(_netdev);       \
+		bat_dbg(DBG_ALL, _batpriv, fmt, ## arg);		\
+		pr_err("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+
+#endif /* _NET_BATMAN_ADV_MAIN_H_ */