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* batman-adv: generalize batman-adv icmp packet handlingSimon Wunderlich2013-10-231-0/+2
| | | | | | | | | | | | | | | | Instead of handling icmp packets only up to length of icmp_packet_rr, the code should handle any icmp length size. Therefore the length truncating is moved to when the packet is actually sent to userspace (this does not support lengths longer than icmp_packet_rr yet). Longer packets are forwarded without truncating. This patch also cleans up some parts where the icmp header struct could be used instead of other icmp_packet(_rr) structs to make the code more readable. Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: include the sync-flags when compute the global/local table CRCAntonio Quartulli2013-10-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | Flags covered by TT_SYNC_MASK are kept in sync among the nodes in the network and therefore they have to be considered while computing the global/local table CRC. In this way a generic originator is able to understand if its table contains the correct flags or not. Bits from 4 to 7 in the TT flags fields are now reserved for "synchronized" flags only. This allows future developers to add more flags of this type without breaking compatibility. It's important to note that not all the remote TT flags are synchronised. This comes from the fact that some flags are used to inject an information once only. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
* batman-adv: make the TT CRC logic VLAN specificAntonio Quartulli2013-10-191-3/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | This change allows nodes to handle the TT table on a per-VLAN basis. This is needed because nodes may have to store only some of the global entries advertised by another node. In this scenario such nodes would re-create only a partial global table and would not be able to compute a correct CRC anymore. This patch splits the logic and introduces one CRC per VLAN. In this way a node fetching only some entries belonging to some VLANs is still able to compute the needed CRCs and still check the table correctness. With this patch the shape of the TVLV-TT is changed too because now a node needs to advertise all the CRCs of all the VLANs that it is wired to. The debug output of the local Translation Table now shows the CRC along with each entry since there is not a common value for the entire table anymore. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: add the VLAN ID attribute to the TT entryAntonio Quartulli2013-10-191-2/+12
| | | | | | | | | To make the translation table code VLAN-aware, each entry must carry the VLAN ID which it belongs to. This patch adds such attribute to the related TT structures. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: create common header for ICMP packetsAntonio Quartulli2013-10-121-10/+28
| | | | | | | | | | | | | | | | | | | | the icmp and the icmp_rr packets share the same initial fields since they use the same code to be processed and forwarded. Extract the common fields and put them into a separate struct so that future ICMP packets can be easily added without bloating the packet definition. However, keep the seqno field outside of the newly created common header because future ICMP types may require a bigger sequence number space. This change breaks compatibility due to fields reordering in the ICMP headers. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: Receive fragmented packets and mergeMartin Hundebøll2013-10-121-0/+27
| | | | | | | | | | | | | Fragments arriving at their destination are buffered for later merge. Merged packets are passed to the main receive function as had they never been fragmented. Fragments are forwarded without merging if the MTU of the outgoing interface is smaller than the size of the merged packet. Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: Remove old fragmentation codeMartin Hundebøll2013-10-121-16/+0
| | | | | | | | | | | | | | | | | | Remove the existing fragmentation code before adding the new version and delete unicast.{h,c}. batadv_unicast_send_skb() is moved to send.c and renamed to batadv_send_skb_unicast(). fragmentation entry in sysfs (bat_priv->fragmentation) is kept for use in the new fragmentation code. BATADV_UNICAST_FRAG packet type is renamed to BATADV_FRAG for use in the new fragmentation code. Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: reorder batadv_iv_flagsSimon Wunderlich2013-10-091-4/+14
| | | | | | | | | The vis flag is not needed anymore, and since we do a compat bump we can start with the first bit again Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: remove packed from batadv_ogm_packetSimon Wunderlich2013-10-091-1/+4
| | | | | | | | | As we decreased the struct size from 26 to 24 byte, we can remove __packed as the compiler will not add any more padding. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: reorder packet typesSimon Wunderlich2013-10-091-8/+23
| | | | | | | | | | | | Reordering the packet type numbers allows us to handle unicast packets in a general way - even if we don't know the specific packet type, we can still forward it. There was already code handling this for a couple of unicast packets, and this is the more generalized version to do that. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: remove vis functionalitySimon Wunderlich2013-10-091-20/+1
| | | | | | | | | This is replaced by a userspace program, we don't need this functionality to bloat the kernel. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: move BATADV_TT_CLIENT_TEMP to higher bitAntonio Quartulli2013-10-091-1/+1
| | | | | | | | | | Client flags from bit 0 to 7 are sent over the wire. BATADV_TT_CLIENT_TEMP is a local flag and is not supposed to be sent to the network. Therefore it has occupy a higher bit. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: use CRC32C instead of CRC16 in TT codeAntonio Quartulli2013-10-091-2/+4
| | | | | | | | | | | CRC32C has to be preferred to CRC16 because of its possible HW native support and because of the reduced collision probability. With this change the Translation Table component now uses CRC32C to compute the local and global table checksum. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: tvlv - convert roaming adv packet to use tvlv unicast packetsMarek Lindner2013-10-091-9/+12
| | | | | | | | Instead of generating roaming specific packets the TVLV unicast API is used to send roaming information. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - convert tt query packet to use tvlv unicast packetsMarek Lindner2013-10-091-33/+0
| | | | | | | | Instead of generating TT specific packets the TVLV unicast API is used to send translation table data. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - convert tt data sent within OGMsMarek Lindner2013-10-091-10/+41
| | | | | | | | | The translation table meta data (version number, crc checksum, etc) as well as the translation table diff propgated within OGMs now uses the newly introduced tvlv infrastructure. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - add network coding containerMarek Lindner2013-10-091-0/+2
| | | | | | | | Create network coding container to announce network coding capabilities (if enabled). Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - add distributed arp table containerMarek Lindner2013-10-091-0/+2
| | | | | | | Create DAT container to announce DAT capabilities (if enabled). Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - gateway download/upload bandwidth containerMarek Lindner2013-10-091-1/+20
| | | | | | | | | | | | | Prior to this patch batman-adv read the advertised uplink bandwidth from userspace and compressed this information into a single byte called "gateway class". Now the download & upload bandwidth information is sent as-is. No userspace change is necessary since the sysfs API always allowed to specify a bandwidth. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: tvlv - basic infrastructureMarek Lindner2013-10-091-0/+41
| | | | | | | | | | | | | | | | | | | | | | | The goal is to provide the infrastructure for sending, receiving and parsing information 'containers' while preserving backward compatibility. TVLV (based on the commonly known Type Length Value technique) was chosen as the format for those containers. Even if a node does not know the tvlv type of a certain container it can simply skip the current container and proceed with the next. Past experience has shown features evolve over time, so a 'version' field was added right from the start to allow differentiating between feature variants - hence the name: T(ype) V(ersion) L(ength) V(alue). This patch introduces the basic TVLV infrastructure: * register / unregister tvlv containers to be sent with each OGM (on primary interfaces only) * register / unregister callback handlers to be called upon finding the corresponding tvlv type in a tvlv buffer * unicast tvlv send / receive API calls Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
* batman-adv: switch to a new packet compatibility versionAntonio Quartulli2013-10-091-1/+1
| | | | | | | | | | With this change batman-adv is breaking compatibility with older versions and it is moving to compat-version 15. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: Fix endianness errors for network codingMartin Hundebøll2013-03-271-1/+1
| | | | | | | | | | | | | | | | | | Add a htonl() in network_coding.c when reading the sequence number from received ogm_packet, to avoid wrong byte ordering when comparing with a host value. This bug was introduced in 3ed7ada3f0bbcd058567bc0a8f9729a73eba7db6 ("batman-adv: network coding - detect coding nodes and remove these after timeout"). Change the type of coded_packet->coded_len from uint16 to __be16 to avoid wrong assumptions about endianness in later uses. Introduced in c3289f3650d34b60296000a629c99f2488f7c3dd ("batman-adv: network coding - code and transmit packets if possible"). Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: network coding - code and transmit packets if possibleMartin Hundebøll2013-03-131-0/+33
| | | | | | | | | | | | | | | | | Before adding forward-skbs to the coding buffer, the buffer is searched for a potential coding opportunity. If one is found, the two packets are network coded and transmitted right away. If not, the forward-skb is added to the buffer. Network coded packets are transmitted with information about the two receivers and the two coded packets. The first receiver is given by the MAC header, while the second is given in the payload/bat-header. The second receiver uses promiscuous mode to receive the packet and check the second destination. Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: update copyright yearsAntonio Quartulli2013-01-191-1/+1
| | | | | Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: use ETH_P_BATMANAntonio Quartulli2012-11-301-2/+0
| | | | | | | | The ETH_P_BATMAN ethertype is now defined kernel-wide. Use it instead of the private BATADV_ETH_P_BATMAN define. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: Use packing of 2 for all headers before an ethernet headerSven Eckelmann2012-11-211-1/+15
| | | | | | | | | | | | | | | | All packet headers in front of an ethernet header have to be completely divisible by 2 but not by 4 to make the payload after the ethernet header again 4 bytes boundary aligned. A packing of 2 is necessary to avoid extra padding at the end of the struct caused by a structure member which is larger than two bytes. Otherwise the structure would not fulfill the previously mentioned rule to avoid the misalignment of the payload after the ethernet header. It may also lead to leakage of information when the padding it not initialized before sending. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: Distributed ARP Table - add ARP parsing functionsAntonio Quartulli2012-11-071-1/+7
| | | | | | | ARP messages are now parsed to make it possible to trigger special actions depending on their types (snooping). Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: add UNICAST_4ADDR packet typeAntonio Quartulli2012-11-071-8/+33
| | | | | | | | | | | | The current unicast packet type does not contain the orig source address. This patches add a new unicast packet (called UNICAST_4ADDR) which provides two new fields: the originator source address and the subtype (the type of the data contained in the packet payload). The former is useful to identify the node which injected the packet into the network and the latter is useful to avoid creating new unicast packet types in the future: a macro defining a new subtype will be enough. Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: Mark correctly aligned headers not as __packedSven Eckelmann2012-11-071-6/+15
| | | | | | | | | | | | Headers which are already perfectly aligned and create a 4 byte boundary non-ethernet header payload can have the __packed attribute removed. The __packed attribute doesn't change the appeareance of the packet for these headers because no extra padding is necessary to align the data members. The compiler will also create slightly faster code for loads of multi-byte members. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: detect not yet announced clientsAntonio Quartulli2012-08-231-0/+1
| | | | | | | | | | | | | | | | | | | | With the current TT mechanism a new client joining the network is not immediately able to communicate with other hosts because its MAC address has not been announced yet. This situation holds until the first OGM containing its joining event will be spread over the mesh network. This behaviour can be acceptable in networks where the originator interval is a small value (e.g. 1sec) but if that value is set to an higher time (e.g. 5secs) the client could suffer from several malfunctions like DHCP client timeouts, etc. This patch adds an early detection mechanism that makes nodes in the network able to recognise "not yet announced clients" by means of the broadcast packets they emitted on connection (e.g. ARP or DHCP request). The added client will then be confirmed upon receiving the OGM claiming it or purged if such OGM is not received within a fixed amount of time. Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: Use BIT(x) macro to calculate bit positionsSven Eckelmann2012-08-231-15/+15
| | | | | Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: rename bridge loop avoidance claim typesSimon Wunderlich2012-08-231-2/+2
| | | | | | | | for consistency reasons within the code and with the documentation, we should always call it "claim" and "unclaim". Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: Prefix packet structs with batadv_Sven Eckelmann2012-07-011-22/+22
| | | | | Reported-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: Prefix packet enum with BATADV_Sven Eckelmann2012-07-011-44/+44
| | | | | Reported-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: Prefix packet defines with BATADV_Sven Eckelmann2012-06-281-6/+6
| | | | | Reported-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: Reformat multiline comments to consistent styleSven Eckelmann2012-06-201-9/+12
| | | | | | | | batman-adv doesn't follow the style for multiline comments that David S. Miller prefers. All comments should be reformatted to follow this consistent style to make the code slightly more readable. Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: don't bother flipping ->tt_crcAl Viro2012-06-181-1/+1
| | | | | | | Keep it net-endian Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: don't bother flipping ->tt_dataAl Viro2012-06-181-1/+1
| | | | | | | | | just keep it net-endian all along Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> [lindner_marek@yahoo.de: fix checkpatch warnings] Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: keep batman_ogm_packet ->seqno net-endian all alongAl Viro2012-06-181-1/+1
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: trivial endianness annotationsAl Viro2012-06-181-6/+6
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: avoid temporary routing loops by being strict on forwarded OGMsMarek Lindner2012-05-111-0/+1
| | | | | | | | | | | | | | | | | batman-adv would forward OGMs from non-besthops while replacing the the TQ and TTL values with the values from the best hop. In certain corner cases this leads to a temporary routing loop. This patch changes this behavior: Only packets from best next hops are forwarded - TQ and TTL values won't be replaced anymore. However, the protocol needs to rebroadcast OGMs from single hop neighbors regardless of whether or not they are the best hop. To handle this case a new flag is introduced to alert neighboring nodes about the forwarded OGM that is not from my best next hop. It is to be discarded by all nodes except for the one originating the OGM. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Acked-by: Daniele Furlan <daniele.furlan@gmail.com> Tested-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
* batman-adv: mark existing ogm variables as batman ivMarek Lindner2012-04-181-2/+2
| | | | | | | | The coming protocol changes also will have a part called "OGM". That makes it necessary to introduce a distinction in the code base. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: rename BATMAN_OGM_LEN to BATMAN_OGM_HLENMarek Lindner2012-04-181-1/+1
| | | | | | | | | Using BATMAN_OGM_LEN leaves one with the impression that this is the full packet size which is not the case. Therefore the variable is renamed. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: add basic bridge loop avoidance codeSimon Wunderlich2012-04-111-0/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | This second version of the bridge loop avoidance for batman-adv avoids loops between the mesh and a backbone (usually a LAN). By connecting multiple batman-adv mesh nodes to the same ethernet segment a loop can be created when the soft-interface is bridged into that ethernet segment. A simple visualization of the loop involving the most common case - a LAN as ethernet segment: node1 <-- LAN --> node2 | | wifi <-- mesh --> wifi Packets from the LAN (e.g. ARP broadcasts) will circle forever from node1 or node2 over the mesh back into the LAN. With this patch, batman recognizes backbone gateways, nodes which are part of the mesh and backbone/LAN at the same time. Each backbone gateway "claims" clients from within the mesh to handle them exclusively. By restricting that only responsible backbone gateways may handle their claimed clients traffic, loops are effectively avoided. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
* batman-adv: use ETH_ALEN instead of hardcoded numeric constantsAntonio Quartulli2012-04-111-13/+13
| | | | | | | | In packet.h the numeric constant 6 is used instead of the more portable ETH_ALEN define. This patch substitute any hardcoded value with such define. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Acked-by: Sven Eckelmann <sven@narfation.org>
* batman-adv: Update copyright yearsSven Eckelmann2012-02-171-1/+1
| | | | | Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: Explicitly mark the common header structureSven Eckelmann2012-02-171-25/+13
| | | | | | | | | | | | | | All batman-adv packets have a common 3 byte header. It can be used to share some code between different code paths, but it was never explicit stated that this header has to be always the same for all packets. Therefore, new code changes always have the problem that they may accidently introduce regressions by moving some elements around. A new structure is introduced that contains the common header and makes it easier visible that these 3 bytes have to be the same for all on-wire packets. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: rename all instances of batman_packet to batman_ogm_packetMarek Lindner2011-09-081-9/+9
| | | | | | | The follow-up routing code changes are going to introduce additional routing packet types which make this distinction necessary. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: detect clients connected through a 802.11 deviceAntonio Quartulli2011-08-221-0/+1
| | | | | | | | | Clients connected through a 802.11 device are now marked with the TT_CLIENT_WIFI flag. This flag is also advertised with the tt announcement. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
* batman-adv: keep local table consistency for further TT_RESPONSEAntonio Quartulli2011-07-071-1/+3
| | | | | | | | | | | | | To keep transtable consistency among all the nodes, an originator must not send not yet announced clients within a full table TT_RESPONSE. Instead, deleted client have to be kept in the table in order to be sent within an immediate TT_RESPONSE. In this way all the nodes in the network will always provide the same response for the same request. All the modification are committed at the next ttvn increment event. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
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