net/batman-adv/packet.h - kernel/msm-4.19 - Gitiles

 /* Copyright (C) 2007-2016  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, see <http://www.gnu.org/licenses/>.
  */

 #ifndef _NET_BATMAN_ADV_PACKET_H_
 #define _NET_BATMAN_ADV_PACKET_H_

 #include <asm/byteorder.h>
 #include <linux/types.h>

 /**
  * enum batadv_packettype - types for batman-adv encapsulated packets
  * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
  * @BATADV_BCAST: broadcast packets carrying broadcast payload
  * @BATADV_CODED: network coded packets
  * @BATADV_ELP: echo location packets for B.A.T.M.A.N. V
  *
  * @BATADV_UNICAST: unicast packets carrying unicast payload traffic
  * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
  *     payload packet
  * @BATADV_UNICAST_4ADDR: unicast packet including the originator address of
  *     the sender
  * @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute
  * @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers
  */
 enum batadv_packettype {
 	/* 0x00 - 0x3f: local packets or special rules for handling */
 	BATADV_IV_OGM           = 0x00,
 	BATADV_BCAST            = 0x01,
 	BATADV_CODED            = 0x02,
 	BATADV_ELP		= 0x03,
 	/* 0x40 - 0x7f: unicast */
 #define BATADV_UNICAST_MIN     0x40
 	BATADV_UNICAST          = 0x40,
 	BATADV_UNICAST_FRAG     = 0x41,
 	BATADV_UNICAST_4ADDR    = 0x42,
 	BATADV_ICMP             = 0x43,
 	BATADV_UNICAST_TVLV     = 0x44,
 #define BATADV_UNICAST_MAX     0x7f
 	/* 0x80 - 0xff: reserved */
 };

 /**
  * enum batadv_subtype - packet subtype for unicast4addr
  * @BATADV_P_DATA: user payload
  * @BATADV_P_DAT_DHT_GET: DHT request message
  * @BATADV_P_DAT_DHT_PUT: DHT store message
  * @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
  */
 enum batadv_subtype {
 	BATADV_P_DATA			= 0x01,
 	BATADV_P_DAT_DHT_GET		= 0x02,
 	BATADV_P_DAT_DHT_PUT		= 0x03,
 	BATADV_P_DAT_CACHE_REPLY	= 0x04,
 };

 /* this file is included by batctl which needs these defines */
 #define BATADV_COMPAT_VERSION 15

 /**
  * enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets
  * @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was
  *     previously received from someone else than the best neighbor.
  * @BATADV_PRIMARIES_FIRST_HOP: flag unused.
  * @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a
  *     one hop neighbor on the interface where it was originally received.
  */
 enum batadv_iv_flags {
 	BATADV_NOT_BEST_NEXT_HOP   = BIT(0),
 	BATADV_PRIMARIES_FIRST_HOP = BIT(1),
 	BATADV_DIRECTLINK          = BIT(2),
 };

 /* ICMP message types */
 enum batadv_icmp_packettype {
 	BATADV_ECHO_REPLY	       = 0,
 	BATADV_DESTINATION_UNREACHABLE = 3,
 	BATADV_ECHO_REQUEST	       = 8,
 	BATADV_TTL_EXCEEDED	       = 11,
 	BATADV_PARAMETER_PROBLEM       = 12,
 };

 /**
  * enum batadv_mcast_flags - flags for multicast capabilities and settings
  * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
  *  224.0.0.0/24 or ff02::1
  * @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets
  * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
  */
 enum batadv_mcast_flags {
 	BATADV_MCAST_WANT_ALL_UNSNOOPABLES	= BIT(0),
 	BATADV_MCAST_WANT_ALL_IPV4		= BIT(1),
 	BATADV_MCAST_WANT_ALL_IPV6		= BIT(2),
 };

 /* tt data subtypes */
 #define BATADV_TT_DATA_TYPE_MASK 0x0F

 /**
  * enum batadv_tt_data_flags - flags for tt data tvlv
  * @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
  * @BATADV_TT_REQUEST: TT request message
  * @BATADV_TT_RESPONSE: TT response message
  * @BATADV_TT_FULL_TABLE: contains full table to replace existing table
  */
 enum batadv_tt_data_flags {
 	BATADV_TT_OGM_DIFF   = BIT(0),
 	BATADV_TT_REQUEST    = BIT(1),
 	BATADV_TT_RESPONSE   = BIT(2),
 	BATADV_TT_FULL_TABLE = BIT(4),
 };

 /**
  * enum batadv_tt_client_flags - TT client specific flags
  * @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
  * @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
  *  update telling its new real location has not been received/sent yet
  * @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
  *  This information is used by the "AP Isolation" feature
  * @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
  *  information is used by the Extended Isolation feature
  * @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
  * @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
  *  not been announced yet
  * @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
  *  in the table for one more originator interval for consistency purposes
  * @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
  *  the network but no nnode has already announced it
  *
  * Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
  * Bits from 8 to 15 are called _local flags_ because they are used for local
  * computations only.
  *
  * Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
  * the other nodes in the network. To achieve this goal these flags are included
  * in the TT CRC computation.
  */
 enum batadv_tt_client_flags {
 	BATADV_TT_CLIENT_DEL     = BIT(0),
 	BATADV_TT_CLIENT_ROAM    = BIT(1),
 	BATADV_TT_CLIENT_WIFI    = BIT(4),
 	BATADV_TT_CLIENT_ISOLA	 = BIT(5),
 	BATADV_TT_CLIENT_NOPURGE = BIT(8),
 	BATADV_TT_CLIENT_NEW     = BIT(9),
 	BATADV_TT_CLIENT_PENDING = BIT(10),
 	BATADV_TT_CLIENT_TEMP	 = BIT(11),
 };

 /**
  * enum batadv_vlan_flags - flags for the four MSB of any vlan ID field
  * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
  */
 enum batadv_vlan_flags {
 	BATADV_VLAN_HAS_TAG	= BIT(15),
 };

 /* claim frame types for the bridge loop avoidance */
 enum batadv_bla_claimframe {
 	BATADV_CLAIM_TYPE_CLAIM		= 0x00,
 	BATADV_CLAIM_TYPE_UNCLAIM	= 0x01,
 	BATADV_CLAIM_TYPE_ANNOUNCE	= 0x02,
 	BATADV_CLAIM_TYPE_REQUEST	= 0x03,
 };

 /**
  * enum batadv_tvlv_type - tvlv type definitions
  * @BATADV_TVLV_GW: gateway tvlv
  * @BATADV_TVLV_DAT: distributed arp table tvlv
  * @BATADV_TVLV_NC: network coding tvlv
  * @BATADV_TVLV_TT: translation table tvlv
  * @BATADV_TVLV_ROAM: roaming advertisement tvlv
  * @BATADV_TVLV_MCAST: multicast capability tvlv
  */
 enum batadv_tvlv_type {
 	BATADV_TVLV_GW		= 0x01,
 	BATADV_TVLV_DAT		= 0x02,
 	BATADV_TVLV_NC		= 0x03,
 	BATADV_TVLV_TT		= 0x04,
 	BATADV_TVLV_ROAM	= 0x05,
 	BATADV_TVLV_MCAST	= 0x06,
 };

 #pragma pack(2)
 /* the destination hardware field in the ARP frame is used to
  * transport the claim type and the group id
  */
 struct batadv_bla_claim_dst {
 	u8     magic[3];	/* FF:43:05 */
 	u8     type;		/* bla_claimframe */
 	__be16 group;		/* group id */
 };

 #pragma pack()

 /**
  * struct batadv_ogm_packet - ogm (routing protocol) packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @flags: contains routing relevant flags - see enum batadv_iv_flags
  * @seqno: sequence identification
  * @orig: address of the source node
  * @prev_sender: address of the previous sender
  * @reserved: reserved byte for alignment
  * @tq: transmission quality
  * @tvlv_len: length of tvlv data following the ogm header
  */
 struct batadv_ogm_packet {
 	u8     packet_type;
 	u8     version;
 	u8     ttl;
 	u8     flags;
 	__be32 seqno;
 	u8     orig[ETH_ALEN];
 	u8     prev_sender[ETH_ALEN];
 	u8     reserved;
 	u8     tq;
 	__be16 tvlv_len;
 	/* __packed is not needed as the struct size is divisible by 4,
 	 * and the largest data type in this struct has a size of 4.
 	 */
 };

 #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)

 /**
  * struct batadv_elp_packet - elp (neighbor discovery) packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @orig: originator mac address
  * @seqno: sequence number
  * @elp_interval: currently used ELP sending interval in ms
  */
 struct batadv_elp_packet {
 	u8     packet_type;
 	u8     version;
 	u8     orig[ETH_ALEN];
 	__be32 seqno;
 	__be32 elp_interval;
 };

 #define BATADV_ELP_HLEN sizeof(struct batadv_elp_packet)

 /**
  * struct batadv_icmp_header - common members among all the ICMP packets
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @msg_type: ICMP packet type
  * @dst: address of the destination node
  * @orig: address of the source node
  * @uid: local ICMP socket identifier
  * @align: not used - useful for alignment purposes only
  *
  * This structure is used for ICMP packets parsing only and it is never sent
  * over the wire. The alignment field at the end is there to ensure that
  * members are padded the same way as they are in real packets.
  */
 struct batadv_icmp_header {
 	u8 packet_type;
 	u8 version;
 	u8 ttl;
 	u8 msg_type; /* see ICMP message types above */
 	u8 dst[ETH_ALEN];
 	u8 orig[ETH_ALEN];
 	u8 uid;
 	u8 align[3];
 };

 /**
  * struct batadv_icmp_packet - ICMP packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @msg_type: ICMP packet type
  * @dst: address of the destination node
  * @orig: address of the source node
  * @uid: local ICMP socket identifier
  * @reserved: not used - useful for alignment
  * @seqno: ICMP sequence number
  */
 struct batadv_icmp_packet {
 	u8     packet_type;
 	u8     version;
 	u8     ttl;
 	u8     msg_type; /* see ICMP message types above */
 	u8     dst[ETH_ALEN];
 	u8     orig[ETH_ALEN];
 	u8     uid;
 	u8     reserved;
 	__be16 seqno;
 };

 #define BATADV_RR_LEN 16

 /**
  * struct batadv_icmp_packet_rr - ICMP RouteRecord packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @msg_type: ICMP packet type
  * @dst: address of the destination node
  * @orig: address of the source node
  * @uid: local ICMP socket identifier
  * @rr_cur: number of entries the rr array
  * @seqno: ICMP sequence number
  * @rr: route record array
  */
 struct batadv_icmp_packet_rr {
 	u8     packet_type;
 	u8     version;
 	u8     ttl;
 	u8     msg_type; /* see ICMP message types above */
 	u8     dst[ETH_ALEN];
 	u8     orig[ETH_ALEN];
 	u8     uid;
 	u8     rr_cur;
 	__be16 seqno;
 	u8     rr[BATADV_RR_LEN][ETH_ALEN];
 };

 #define BATADV_ICMP_MAX_PACKET_SIZE	sizeof(struct batadv_icmp_packet_rr)

 /* 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.
  */
 #pragma pack(2)

 /**
  * struct batadv_unicast_packet - unicast packet for network payload
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @ttvn: translation table version number
  * @dest: originator destination of the unicast packet
  */
 struct batadv_unicast_packet {
 	u8 packet_type;
 	u8 version;
 	u8 ttl;
 	u8 ttvn; /* destination translation table version number */
 	u8 dest[ETH_ALEN];
 	/* "4 bytes boundary + 2 bytes" long to make the payload after the
 	 * following ethernet header again 4 bytes boundary aligned
 	 */
 };

 /**
  * struct batadv_unicast_4addr_packet - extended unicast packet
  * @u: common unicast packet header
  * @src: address of the source
  * @subtype: packet subtype
  * @reserved: reserved byte for alignment
  */
 struct batadv_unicast_4addr_packet {
 	struct batadv_unicast_packet u;
 	u8 src[ETH_ALEN];
 	u8 subtype;
 	u8 reserved;
 	/* "4 bytes boundary + 2 bytes" long to make the payload after the
 	 * following ethernet header again 4 bytes boundary aligned
 	 */
 };

 /**
  * struct batadv_frag_packet - fragmented packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @dest: final destination used when routing fragments
  * @orig: originator of the fragment used when merging the packet
  * @no: fragment number within this sequence
  * @reserved: reserved byte for alignment
  * @seqno: sequence identification
  * @total_size: size of the merged packet
  */
 struct batadv_frag_packet {
 	u8     packet_type;
 	u8     version;  /* batman version field */
 	u8     ttl;
 #if defined(__BIG_ENDIAN_BITFIELD)
 	u8     no:4;
 	u8     reserved:4;
 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 	u8     reserved:4;
 	u8     no:4;
 #else
 #error "unknown bitfield endianness"
 #endif
 	u8     dest[ETH_ALEN];
 	u8     orig[ETH_ALEN];
 	__be16 seqno;
 	__be16 total_size;
 };

 /**
  * struct batadv_bcast_packet - broadcast packet for network payload
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @reserved: reserved byte for alignment
  * @seqno: sequence identification
  * @orig: originator of the broadcast packet
  */
 struct batadv_bcast_packet {
 	u8     packet_type;
 	u8     version;  /* batman version field */
 	u8     ttl;
 	u8     reserved;
 	__be32 seqno;
 	u8     orig[ETH_ALEN];
 	/* "4 bytes boundary + 2 bytes" long to make the payload after the
 	 * following ethernet header again 4 bytes boundary aligned
 	 */
 };

 /**
  * struct batadv_coded_packet - network coded packet
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @first_source: original source of first included packet
  * @first_orig_dest: original destinal of first included packet
  * @first_crc: checksum of first included packet
  * @first_ttvn: tt-version number of first included packet
  * @second_ttl: ttl of second packet
  * @second_dest: second receiver of this coded packet
  * @second_source: original source of second included packet
  * @second_orig_dest: original destination of second included packet
  * @second_crc: checksum of second included packet
  * @second_ttvn: tt version number of second included packet
  * @coded_len: length of network coded part of the payload
  */
 struct batadv_coded_packet {
 	u8     packet_type;
 	u8     version;  /* batman version field */
 	u8     ttl;
 	u8     first_ttvn;
 	/* u8  first_dest[ETH_ALEN]; - saved in mac header destination */
 	u8     first_source[ETH_ALEN];
 	u8     first_orig_dest[ETH_ALEN];
 	__be32 first_crc;
 	u8     second_ttl;
 	u8     second_ttvn;
 	u8     second_dest[ETH_ALEN];
 	u8     second_source[ETH_ALEN];
 	u8     second_orig_dest[ETH_ALEN];
 	__be32 second_crc;
 	__be16 coded_len;
 };

 #pragma pack()

 /**
  * struct batadv_unicast_tvlv - generic unicast packet with tvlv payload
  * @packet_type: batman-adv packet type, part of the general header
  * @version: batman-adv protocol version, part of the genereal header
  * @ttl: time to live for this packet, part of the genereal header
  * @reserved: reserved field (for packet alignment)
  * @src: address of the source
  * @dst: address of the destination
  * @tvlv_len: length of tvlv data following the unicast tvlv header
  * @align: 2 bytes to align the header to a 4 byte boundary
  */
 struct batadv_unicast_tvlv_packet {
 	u8     packet_type;
 	u8     version;  /* batman version field */
 	u8     ttl;
 	u8     reserved;
 	u8     dst[ETH_ALEN];
 	u8     src[ETH_ALEN];
 	__be16 tvlv_len;
 	u16    align;
 };

 /**
  * struct batadv_tvlv_hdr - base tvlv header struct
  * @type: tvlv container type (see batadv_tvlv_type)
  * @version: tvlv container version
  * @len: tvlv container length
  */
 struct batadv_tvlv_hdr {
 	u8     type;
 	u8     version;
 	__be16 len;
 };

 /**
  * struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv
  *  container
  * @bandwidth_down: advertised uplink download bandwidth
  * @bandwidth_up: advertised uplink upload bandwidth
  */
 struct batadv_tvlv_gateway_data {
 	__be32 bandwidth_down;
 	__be32 bandwidth_up;
 };

 /**
  * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
  * @flags: translation table flags (see batadv_tt_data_flags)
  * @ttvn: translation table version number
  * @num_vlan: number of announced VLANs. In the TVLV this struct is followed by
  *  one batadv_tvlv_tt_vlan_data object per announced vlan
  */
 struct batadv_tvlv_tt_data {
 	u8     flags;
 	u8     ttvn;
 	__be16 num_vlan;
 };

 /**
  * struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through
  *  the tt tvlv container
  * @crc: crc32 checksum of the entries belonging to this vlan
  * @vid: vlan identifier
  * @reserved: unused, useful for alignment purposes
  */
 struct batadv_tvlv_tt_vlan_data {
 	__be32 crc;
 	__be16 vid;
 	u16    reserved;
 };

 /**
  * struct batadv_tvlv_tt_change - translation table diff data
  * @flags: status indicators concerning the non-mesh client (see
  *  batadv_tt_client_flags)
  * @reserved: reserved field - useful for alignment purposes only
  * @addr: mac address of non-mesh client that triggered this tt change
  * @vid: VLAN identifier
  */
 struct batadv_tvlv_tt_change {
 	u8     flags;
 	u8     reserved[3];
 	u8     addr[ETH_ALEN];
 	__be16 vid;
 };

 /**
  * struct batadv_tvlv_roam_adv - roaming advertisement
  * @client: mac address of roaming client
  * @vid: VLAN identifier
  */
 struct batadv_tvlv_roam_adv {
 	u8     client[ETH_ALEN];
 	__be16 vid;
 };

 /**
  * struct batadv_tvlv_mcast_data - payload of a multicast tvlv
  * @flags: multicast flags announced by the orig node
  * @reserved: reserved field
  */
 struct batadv_tvlv_mcast_data {
 	u8 flags;
 	u8 reserved[3];
 };

 #endif /* _NET_BATMAN_ADV_PACKET_H_ */
	/* Copyright (C) 2007-2016 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, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef _NET_BATMAN_ADV_PACKET_H_
	#define _NET_BATMAN_ADV_PACKET_H_

	#include <asm/byteorder.h>
	#include <linux/types.h>

	/**
	* enum batadv_packettype - types for batman-adv encapsulated packets
	* @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
	* @BATADV_BCAST: broadcast packets carrying broadcast payload
	* @BATADV_CODED: network coded packets
	* @BATADV_ELP: echo location packets for B.A.T.M.A.N. V
	*
	* @BATADV_UNICAST: unicast packets carrying unicast payload traffic
	* @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
	* payload packet
	* @BATADV_UNICAST_4ADDR: unicast packet including the originator address of
	* the sender
	* @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute
	* @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers
	*/
	enum batadv_packettype {
	/* 0x00 - 0x3f: local packets or special rules for handling */
	BATADV_IV_OGM = 0x00,
	BATADV_BCAST = 0x01,
	BATADV_CODED = 0x02,
	BATADV_ELP = 0x03,
	/* 0x40 - 0x7f: unicast */
	#define BATADV_UNICAST_MIN 0x40
	BATADV_UNICAST = 0x40,
	BATADV_UNICAST_FRAG = 0x41,
	BATADV_UNICAST_4ADDR = 0x42,
	BATADV_ICMP = 0x43,
	BATADV_UNICAST_TVLV = 0x44,
	#define BATADV_UNICAST_MAX 0x7f
	/* 0x80 - 0xff: reserved */
	};

	/**
	* enum batadv_subtype - packet subtype for unicast4addr
	* @BATADV_P_DATA: user payload
	* @BATADV_P_DAT_DHT_GET: DHT request message
	* @BATADV_P_DAT_DHT_PUT: DHT store message
	* @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
	*/
	enum batadv_subtype {
	BATADV_P_DATA = 0x01,
	BATADV_P_DAT_DHT_GET = 0x02,
	BATADV_P_DAT_DHT_PUT = 0x03,
	BATADV_P_DAT_CACHE_REPLY = 0x04,
	};

	/* this file is included by batctl which needs these defines */
	#define BATADV_COMPAT_VERSION 15

	/**
	* enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets
	* @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was
	* previously received from someone else than the best neighbor.
	* @BATADV_PRIMARIES_FIRST_HOP: flag unused.
	* @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a
	* one hop neighbor on the interface where it was originally received.
	*/
	enum batadv_iv_flags {
	BATADV_NOT_BEST_NEXT_HOP = BIT(0),
	BATADV_PRIMARIES_FIRST_HOP = BIT(1),
	BATADV_DIRECTLINK = BIT(2),
	};

	/* ICMP message types */
	enum batadv_icmp_packettype {
	BATADV_ECHO_REPLY = 0,
	BATADV_DESTINATION_UNREACHABLE = 3,
	BATADV_ECHO_REQUEST = 8,
	BATADV_TTL_EXCEEDED = 11,
	BATADV_PARAMETER_PROBLEM = 12,
	};

	/**
	* enum batadv_mcast_flags - flags for multicast capabilities and settings
	* @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
	* 224.0.0.0/24 or ff02::1
	* @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets
	* @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
	*/
	enum batadv_mcast_flags {
	BATADV_MCAST_WANT_ALL_UNSNOOPABLES = BIT(0),
	BATADV_MCAST_WANT_ALL_IPV4 = BIT(1),
	BATADV_MCAST_WANT_ALL_IPV6 = BIT(2),
	};

	/* tt data subtypes */
	#define BATADV_TT_DATA_TYPE_MASK 0x0F

	/**
	* enum batadv_tt_data_flags - flags for tt data tvlv
	* @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
	* @BATADV_TT_REQUEST: TT request message
	* @BATADV_TT_RESPONSE: TT response message
	* @BATADV_TT_FULL_TABLE: contains full table to replace existing table
	*/
	enum batadv_tt_data_flags {
	BATADV_TT_OGM_DIFF = BIT(0),
	BATADV_TT_REQUEST = BIT(1),
	BATADV_TT_RESPONSE = BIT(2),
	BATADV_TT_FULL_TABLE = BIT(4),
	};

	/**
	* enum batadv_tt_client_flags - TT client specific flags
	* @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
	* @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
	* update telling its new real location has not been received/sent yet
	* @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
	* This information is used by the "AP Isolation" feature
	* @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
	* information is used by the Extended Isolation feature
	* @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
	* @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
	* not been announced yet
	* @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
	* in the table for one more originator interval for consistency purposes
	* @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
	* the network but no nnode has already announced it
	*
	* Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
	* Bits from 8 to 15 are called _local flags_ because they are used for local
	* computations only.
	*
	* Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
	* the other nodes in the network. To achieve this goal these flags are included
	* in the TT CRC computation.
	*/
	enum batadv_tt_client_flags {
	BATADV_TT_CLIENT_DEL = BIT(0),
	BATADV_TT_CLIENT_ROAM = BIT(1),
	BATADV_TT_CLIENT_WIFI = BIT(4),
	BATADV_TT_CLIENT_ISOLA = BIT(5),
	BATADV_TT_CLIENT_NOPURGE = BIT(8),
	BATADV_TT_CLIENT_NEW = BIT(9),
	BATADV_TT_CLIENT_PENDING = BIT(10),
	BATADV_TT_CLIENT_TEMP = BIT(11),
	};

	/**
	* enum batadv_vlan_flags - flags for the four MSB of any vlan ID field
	* @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
	*/
	enum batadv_vlan_flags {
	BATADV_VLAN_HAS_TAG = BIT(15),
	};

	/* claim frame types for the bridge loop avoidance */
	enum batadv_bla_claimframe {
	BATADV_CLAIM_TYPE_CLAIM = 0x00,
	BATADV_CLAIM_TYPE_UNCLAIM = 0x01,
	BATADV_CLAIM_TYPE_ANNOUNCE = 0x02,
	BATADV_CLAIM_TYPE_REQUEST = 0x03,
	};

	/**
	* enum batadv_tvlv_type - tvlv type definitions
	* @BATADV_TVLV_GW: gateway tvlv
	* @BATADV_TVLV_DAT: distributed arp table tvlv
	* @BATADV_TVLV_NC: network coding tvlv
	* @BATADV_TVLV_TT: translation table tvlv
	* @BATADV_TVLV_ROAM: roaming advertisement tvlv
	* @BATADV_TVLV_MCAST: multicast capability tvlv
	*/
	enum batadv_tvlv_type {
	BATADV_TVLV_GW = 0x01,
	BATADV_TVLV_DAT = 0x02,
	BATADV_TVLV_NC = 0x03,
	BATADV_TVLV_TT = 0x04,
	BATADV_TVLV_ROAM = 0x05,
	BATADV_TVLV_MCAST = 0x06,
	};

	#pragma pack(2)
	/* the destination hardware field in the ARP frame is used to
	* transport the claim type and the group id
	*/
	struct batadv_bla_claim_dst {
	u8 magic[3]; /* FF:43:05 */
	u8 type; /* bla_claimframe */
	__be16 group; /* group id */
	};

	#pragma pack()

	/**
	* struct batadv_ogm_packet - ogm (routing protocol) packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @flags: contains routing relevant flags - see enum batadv_iv_flags
	* @seqno: sequence identification
	* @orig: address of the source node
	* @prev_sender: address of the previous sender
	* @reserved: reserved byte for alignment
	* @tq: transmission quality
	* @tvlv_len: length of tvlv data following the ogm header
	*/
	struct batadv_ogm_packet {
	u8 packet_type;
	u8 version;
	u8 ttl;
	u8 flags;
	__be32 seqno;
	u8 orig[ETH_ALEN];
	u8 prev_sender[ETH_ALEN];
	u8 reserved;
	u8 tq;
	__be16 tvlv_len;
	/* __packed is not needed as the struct size is divisible by 4,
	* and the largest data type in this struct has a size of 4.
	*/
	};

	#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)

	/**
	* struct batadv_elp_packet - elp (neighbor discovery) packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @orig: originator mac address
	* @seqno: sequence number
	* @elp_interval: currently used ELP sending interval in ms
	*/
	struct batadv_elp_packet {
	u8 packet_type;
	u8 version;
	u8 orig[ETH_ALEN];
	__be32 seqno;
	__be32 elp_interval;
	};

	#define BATADV_ELP_HLEN sizeof(struct batadv_elp_packet)

	/**
	* struct batadv_icmp_header - common members among all the ICMP packets
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @msg_type: ICMP packet type
	* @dst: address of the destination node
	* @orig: address of the source node
	* @uid: local ICMP socket identifier
	* @align: not used - useful for alignment purposes only
	*
	* This structure is used for ICMP packets parsing only and it is never sent
	* over the wire. The alignment field at the end is there to ensure that
	* members are padded the same way as they are in real packets.
	*/
	struct batadv_icmp_header {
	u8 packet_type;
	u8 version;
	u8 ttl;
	u8 msg_type; /* see ICMP message types above */
	u8 dst[ETH_ALEN];
	u8 orig[ETH_ALEN];
	u8 uid;
	u8 align[3];
	};

	/**
	* struct batadv_icmp_packet - ICMP packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @msg_type: ICMP packet type
	* @dst: address of the destination node
	* @orig: address of the source node
	* @uid: local ICMP socket identifier
	* @reserved: not used - useful for alignment
	* @seqno: ICMP sequence number
	*/
	struct batadv_icmp_packet {
	u8 packet_type;
	u8 version;
	u8 ttl;
	u8 msg_type; /* see ICMP message types above */
	u8 dst[ETH_ALEN];
	u8 orig[ETH_ALEN];
	u8 uid;
	u8 reserved;
	__be16 seqno;
	};

	#define BATADV_RR_LEN 16

	/**
	* struct batadv_icmp_packet_rr - ICMP RouteRecord packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @msg_type: ICMP packet type
	* @dst: address of the destination node
	* @orig: address of the source node
	* @uid: local ICMP socket identifier
	* @rr_cur: number of entries the rr array
	* @seqno: ICMP sequence number
	* @rr: route record array
	*/
	struct batadv_icmp_packet_rr {
	u8 packet_type;
	u8 version;
	u8 ttl;
	u8 msg_type; /* see ICMP message types above */
	u8 dst[ETH_ALEN];
	u8 orig[ETH_ALEN];
	u8 uid;
	u8 rr_cur;
	__be16 seqno;
	u8 rr[BATADV_RR_LEN][ETH_ALEN];
	};

	#define BATADV_ICMP_MAX_PACKET_SIZE sizeof(struct batadv_icmp_packet_rr)

	/* 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.
	*/
	#pragma pack(2)

	/**
	* struct batadv_unicast_packet - unicast packet for network payload
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @ttvn: translation table version number
	* @dest: originator destination of the unicast packet
	*/
	struct batadv_unicast_packet {
	u8 packet_type;
	u8 version;
	u8 ttl;
	u8 ttvn; /* destination translation table version number */
	u8 dest[ETH_ALEN];
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	* following ethernet header again 4 bytes boundary aligned
	*/
	};

	/**
	* struct batadv_unicast_4addr_packet - extended unicast packet
	* @u: common unicast packet header
	* @src: address of the source
	* @subtype: packet subtype
	* @reserved: reserved byte for alignment
	*/
	struct batadv_unicast_4addr_packet {
	struct batadv_unicast_packet u;
	u8 src[ETH_ALEN];
	u8 subtype;
	u8 reserved;
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	* following ethernet header again 4 bytes boundary aligned
	*/
	};

	/**
	* struct batadv_frag_packet - fragmented packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @dest: final destination used when routing fragments
	* @orig: originator of the fragment used when merging the packet
	* @no: fragment number within this sequence
	* @reserved: reserved byte for alignment
	* @seqno: sequence identification
	* @total_size: size of the merged packet
	*/
	struct batadv_frag_packet {
	u8 packet_type;
	u8 version; /* batman version field */
	u8 ttl;
	#if defined(__BIG_ENDIAN_BITFIELD)
	u8 no:4;
	u8 reserved:4;
	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	u8 reserved:4;
	u8 no:4;
	#else
	#error "unknown bitfield endianness"
	#endif
	u8 dest[ETH_ALEN];
	u8 orig[ETH_ALEN];
	__be16 seqno;
	__be16 total_size;
	};

	/**
	* struct batadv_bcast_packet - broadcast packet for network payload
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @reserved: reserved byte for alignment
	* @seqno: sequence identification
	* @orig: originator of the broadcast packet
	*/
	struct batadv_bcast_packet {
	u8 packet_type;
	u8 version; /* batman version field */
	u8 ttl;
	u8 reserved;
	__be32 seqno;
	u8 orig[ETH_ALEN];
	/* "4 bytes boundary + 2 bytes" long to make the payload after the
	* following ethernet header again 4 bytes boundary aligned
	*/
	};

	/**
	* struct batadv_coded_packet - network coded packet
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @first_source: original source of first included packet
	* @first_orig_dest: original destinal of first included packet
	* @first_crc: checksum of first included packet
	* @first_ttvn: tt-version number of first included packet
	* @second_ttl: ttl of second packet
	* @second_dest: second receiver of this coded packet
	* @second_source: original source of second included packet
	* @second_orig_dest: original destination of second included packet
	* @second_crc: checksum of second included packet
	* @second_ttvn: tt version number of second included packet
	* @coded_len: length of network coded part of the payload
	*/
	struct batadv_coded_packet {
	u8 packet_type;
	u8 version; /* batman version field */
	u8 ttl;
	u8 first_ttvn;
	/* u8 first_dest[ETH_ALEN]; - saved in mac header destination */
	u8 first_source[ETH_ALEN];
	u8 first_orig_dest[ETH_ALEN];
	__be32 first_crc;
	u8 second_ttl;
	u8 second_ttvn;
	u8 second_dest[ETH_ALEN];
	u8 second_source[ETH_ALEN];
	u8 second_orig_dest[ETH_ALEN];
	__be32 second_crc;
	__be16 coded_len;
	};

	#pragma pack()

	/**
	* struct batadv_unicast_tvlv - generic unicast packet with tvlv payload
	* @packet_type: batman-adv packet type, part of the general header
	* @version: batman-adv protocol version, part of the genereal header
	* @ttl: time to live for this packet, part of the genereal header
	* @reserved: reserved field (for packet alignment)
	* @src: address of the source
	* @dst: address of the destination
	* @tvlv_len: length of tvlv data following the unicast tvlv header
	* @align: 2 bytes to align the header to a 4 byte boundary
	*/
	struct batadv_unicast_tvlv_packet {
	u8 packet_type;
	u8 version; /* batman version field */
	u8 ttl;
	u8 reserved;
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	__be16 tvlv_len;
	u16 align;
	};

	/**
	* struct batadv_tvlv_hdr - base tvlv header struct
	* @type: tvlv container type (see batadv_tvlv_type)
	* @version: tvlv container version
	* @len: tvlv container length
	*/
	struct batadv_tvlv_hdr {
	u8 type;
	u8 version;
	__be16 len;
	};

	/**
	* struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv
	* container
	* @bandwidth_down: advertised uplink download bandwidth
	* @bandwidth_up: advertised uplink upload bandwidth
	*/
	struct batadv_tvlv_gateway_data {
	__be32 bandwidth_down;
	__be32 bandwidth_up;
	};

	/**
	* struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
	* @flags: translation table flags (see batadv_tt_data_flags)
	* @ttvn: translation table version number
	* @num_vlan: number of announced VLANs. In the TVLV this struct is followed by
	* one batadv_tvlv_tt_vlan_data object per announced vlan
	*/
	struct batadv_tvlv_tt_data {
	u8 flags;
	u8 ttvn;
	__be16 num_vlan;
	};

	/**
	* struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through
	* the tt tvlv container
	* @crc: crc32 checksum of the entries belonging to this vlan
	* @vid: vlan identifier
	* @reserved: unused, useful for alignment purposes
	*/
	struct batadv_tvlv_tt_vlan_data {
	__be32 crc;
	__be16 vid;
	u16 reserved;
	};

	/**
	* struct batadv_tvlv_tt_change - translation table diff data
	* @flags: status indicators concerning the non-mesh client (see
	* batadv_tt_client_flags)
	* @reserved: reserved field - useful for alignment purposes only
	* @addr: mac address of non-mesh client that triggered this tt change
	* @vid: VLAN identifier
	*/
	struct batadv_tvlv_tt_change {
	u8 flags;
	u8 reserved[3];
	u8 addr[ETH_ALEN];
	__be16 vid;
	};

	/**
	* struct batadv_tvlv_roam_adv - roaming advertisement
	* @client: mac address of roaming client
	* @vid: VLAN identifier
	*/
	struct batadv_tvlv_roam_adv {
	u8 client[ETH_ALEN];
	__be16 vid;
	};

	/**
	* struct batadv_tvlv_mcast_data - payload of a multicast tvlv
	* @flags: multicast flags announced by the orig node
	* @reserved: reserved field
	*/
	struct batadv_tvlv_mcast_data {
	u8 flags;
	u8 reserved[3];
	};

	#endif /* _NET_BATMAN_ADV_PACKET_H_ */