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Current File : /usr/include/linux/batadv_packet.h
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) */
/* Copyright (C) B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 */

#ifndef _LINUX_BATADV_PACKET_H_
#define _LINUX_BATADV_PACKET_H_

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

/**
 * batadv_tp_is_error() - Check throughput meter return code for error
 * @n: throughput meter return code
 *
 * Return: 0 when not error was detected, != 0 otherwise
 */
#define batadv_tp_is_error(n) ((__u8)(n) > 127 ? 1 : 0)

/**
 * 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_OGM2: originator messages 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,
	BATADV_OGM2		= 0x04,
	/* 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 the ogm packet is forwarded and
 *  was previously received from someone other 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   = 1UL << 0,
	BATADV_PRIMARIES_FIRST_HOP = 1UL << 1,
	BATADV_DIRECTLINK          = 1UL << 2,
};

/**
 * enum batadv_icmp_packettype - ICMP message types
 * @BATADV_ECHO_REPLY: success reply to BATADV_ECHO_REQUEST
 * @BATADV_DESTINATION_UNREACHABLE: failure when route to destination not found
 * @BATADV_ECHO_REQUEST: request BATADV_ECHO_REPLY from destination
 * @BATADV_TTL_EXCEEDED: error after BATADV_ECHO_REQUEST traversed too many hops
 * @BATADV_PARAMETER_PROBLEM: return code for malformed messages
 * @BATADV_TP: throughput meter packet
 */
enum batadv_icmp_packettype {
	BATADV_ECHO_REPLY	       = 0,
	BATADV_DESTINATION_UNREACHABLE = 3,
	BATADV_ECHO_REQUEST	       = 8,
	BATADV_TTL_EXCEEDED	       = 11,
	BATADV_PARAMETER_PROBLEM       = 12,
	BATADV_TP		       = 15,
};

/**
 * 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
 *  (both link-local and routable ones)
 * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
 *  (both link-local and routable ones)
 * @BATADV_MCAST_WANT_NO_RTR4: we have no IPv4 multicast router and therefore
 * only need routable IPv4 multicast packets we signed up for explicitly
 * @BATADV_MCAST_WANT_NO_RTR6: we have no IPv6 multicast router and therefore
 * only need routable IPv6 multicast packets we signed up for explicitly
 */
enum batadv_mcast_flags {
	BATADV_MCAST_WANT_ALL_UNSNOOPABLES	= 1UL << 0,
	BATADV_MCAST_WANT_ALL_IPV4		= 1UL << 1,
	BATADV_MCAST_WANT_ALL_IPV6		= 1UL << 2,
	BATADV_MCAST_WANT_NO_RTR4		= 1UL << 3,
	BATADV_MCAST_WANT_NO_RTR6		= 1UL << 4,
};

/* 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   = 1UL << 0,
	BATADV_TT_REQUEST    = 1UL << 1,
	BATADV_TT_RESPONSE   = 1UL << 2,
	BATADV_TT_FULL_TABLE = 1UL << 4,
};

/**
 * 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	= 1UL << 15,
};

/**
 * enum batadv_bla_claimframe - claim frame types for the bridge loop avoidance
 * @BATADV_CLAIM_TYPE_CLAIM: claim of a client mac address
 * @BATADV_CLAIM_TYPE_UNCLAIM: unclaim of a client mac address
 * @BATADV_CLAIM_TYPE_ANNOUNCE: announcement of backbone with current crc
 * @BATADV_CLAIM_TYPE_REQUEST: request of full claim table
 * @BATADV_CLAIM_TYPE_LOOPDETECT: mesh-traversing loop detect packet
 */
enum batadv_bla_claimframe {
	BATADV_CLAIM_TYPE_CLAIM		= 0x00,
	BATADV_CLAIM_TYPE_UNCLAIM	= 0x01,
	BATADV_CLAIM_TYPE_ANNOUNCE	= 0x02,
	BATADV_CLAIM_TYPE_REQUEST	= 0x03,
	BATADV_CLAIM_TYPE_LOOPDETECT	= 0x04,
};

/**
 * 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 */
};

/**
 * 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 general header
 * @ttl: time to live for this packet, part of the general 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;
};

#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)

/**
 * struct batadv_ogm2_packet - ogm2 (routing protocol) packet
 * @packet_type: batman-adv packet type, part of the general header
 * @version: batman-adv protocol version, part of the general header
 * @ttl: time to live for this packet, part of the general header
 * @flags: reserved for routing relevant flags - currently always 0
 * @seqno: sequence number
 * @orig: originator mac address
 * @tvlv_len: length of the appended tvlv buffer (in bytes)
 * @throughput: the currently flooded path throughput
 */
struct batadv_ogm2_packet {
	__u8   packet_type;
	__u8   version;
	__u8   ttl;
	__u8   flags;
	__be32 seqno;
	__u8   orig[ETH_ALEN];
	__be16 tvlv_len;
	__be32 throughput;
};

#define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_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 general 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 general header
 * @ttl: time to live for this packet, part of the general 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 packet 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 general header
 * @ttl: time to live for this packet, part of the general 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;
};

/**
 * struct batadv_icmp_tp_packet - ICMP TP Meter packet
 * @packet_type: batman-adv packet type, part of the general header
 * @version: batman-adv protocol version, part of the general header
 * @ttl: time to live for this packet, part of the general header
 * @msg_type: ICMP packet type
 * @dst: address of the destination node
 * @orig: address of the source node
 * @uid: local ICMP socket identifier
 * @subtype: TP packet subtype (see batadv_icmp_tp_subtype)
 * @session: TP session identifier
 * @seqno: the TP sequence number
 * @timestamp: time when the packet has been sent. This value is filled in a
 *  TP_MSG and echoed back in the next TP_ACK so that the sender can compute the
 *  RTT. Since it is read only by the host which wrote it, there is no need to
 *  store it using network order
 */
struct batadv_icmp_tp_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   subtype;
	__u8   session[2];
	__be32 seqno;
	__be32 timestamp;
};

/**
 * enum batadv_icmp_tp_subtype - ICMP TP Meter packet subtypes
 * @BATADV_TP_MSG: Msg from sender to receiver
 * @BATADV_TP_ACK: acknowledgment from receiver to sender
 */
enum batadv_icmp_tp_subtype {
	BATADV_TP_MSG	= 0,
	BATADV_TP_ACK,
};

#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 general header
 * @ttl: time to live for this packet, part of the general 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.
 */

/**
 * 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 general header
 * @ttl: time to live for this packet, part of the general 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 general header
 * @ttl: time to live for this packet, part of the general header
 * @dest: final destination used when routing fragments
 * @orig: originator of the fragment used when merging the packet
 * @no: fragment number within this sequence
 * @priority: priority of frame, from ToS IP precedence or 802.1p
 * @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   priority:3;
	__u8   reserved:1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
	__u8   reserved:1;
	__u8   priority:3;
	__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 general header
 * @ttl: time to live for this packet, part of the general 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 general header
 * @ttl: time to live for this packet, part of the general header
 * @first_source: original source of first included packet
 * @first_orig_dest: original destination 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;
};

/**
 * struct batadv_unicast_tvlv_packet - 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 general header
 * @ttl: time to live for this packet, part of the general 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];
};

#pragma pack()

#endif /* _LINUX_BATADV_PACKET_H_ */

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