Quelle batadv_packet.h Sprache: C

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

#ifndef _UAPI_LINUX_BATADV_PACKET_H_
#define _UAPI_LINUX_BATADV_PACKET_H_

#include <asm/byteorder.h>
#include <linux/if_ether.h>
#include <linux/stddef.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_MCAST: multicast packet with multiple destination addresses
*
* @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,
BATADV_MCAST            = 0x05,
/* 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
* @BATADV_MCAST_HAVE_MC_PTYPE_CAPA: we can parse, receive and forward
* batman-adv multicast packets with a multicast tracker TVLV. And all our
* hard interfaces have an MTU of at least 1280 bytes.
*/
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,
BATADV_MCAST_HAVE_MC_PTYPE_CAPA  = 1UL << 5,
};

/* 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
* @BATADV_TVLV_MCAST_TRACKER: multicast tracker 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,
BATADV_TVLV_MCAST_TRACKER = 0x07,
};

#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_mcast_packet - multicast 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
* @tvlv_len: length of the appended tvlv buffer (in bytes)
*/
struct batadv_mcast_packet {
__u8 packet_type;
__u8 version;
__u8 ttl;
__u8 reserved;
__be16 tvlv_len;
/* "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_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_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
* @vlan_data: array of batadv_tvlv_tt_vlan_data objects
*/
struct batadv_tvlv_tt_data {
__u8   flags;
__u8   ttvn;
__be16 num_vlan;
struct batadv_tvlv_tt_vlan_data vlan_data[] __counted_by_be(num_vlan);
};

/**
* 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];
};

/**
* struct batadv_tvlv_mcast_tracker - payload of a multicast tracker tvlv
* @num_dests: number of subsequent destination originator MAC addresses
*/
struct batadv_tvlv_mcast_tracker {
__be16 num_dests;
};

#pragma pack()

#endif /* _UAPI_LINUX_BATADV_PACKET_H_ */

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Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.