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linux/net/batman-adv/packet.h

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/* Copyright (C) 2007-2015 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_
/**
* 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_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,
/* 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 is set when the primary interface address
* is used, and the packet travels its first hop.
* @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),
};
/**
* 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 {
uint8_t magic[3]; /* FF:43:05 */
uint8_t 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
* @tvlv_len: length of tvlv data following the ogm header
*/
struct batadv_ogm_packet {
uint8_t packet_type;
uint8_t version;
uint8_t ttl;
uint8_t flags;
__be32 seqno;
uint8_t orig[ETH_ALEN];
uint8_t prev_sender[ETH_ALEN];
uint8_t reserved;
uint8_t 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)
/**
* 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 {
uint8_t packet_type;
uint8_t version;
uint8_t ttl;
uint8_t msg_type; /* see ICMP message types above */
uint8_t dst[ETH_ALEN];
uint8_t orig[ETH_ALEN];
uint8_t uid;
uint8_t align[3];
};
/**
* 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 {
uint8_t packet_type;
uint8_t version;
uint8_t ttl;
uint8_t msg_type; /* see ICMP message types above */
uint8_t dst[ETH_ALEN];
uint8_t orig[ETH_ALEN];
uint8_t uid;
uint8_t reserved;
__be16 seqno;
};
#define BATADV_RR_LEN 16
/**
* 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 {
uint8_t packet_type;
uint8_t version;
uint8_t ttl;
uint8_t msg_type; /* see ICMP message types above */
uint8_t dst[ETH_ALEN];
uint8_t orig[ETH_ALEN];
uint8_t uid;
uint8_t rr_cur;
__be16 seqno;
uint8_t 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 {
uint8_t packet_type;
uint8_t version;
uint8_t ttl;
uint8_t ttvn; /* destination translation table version number */
uint8_t 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
*/
struct batadv_unicast_4addr_packet {
struct batadv_unicast_packet u;
uint8_t src[ETH_ALEN];
uint8_t subtype;
uint8_t 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 {
uint8_t packet_type;
uint8_t version; /* batman version field */
uint8_t ttl;
#if defined(__BIG_ENDIAN_BITFIELD)
uint8_t no:4;
uint8_t reserved:4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
uint8_t reserved:4;
uint8_t no:4;
#else
#error "unknown bitfield endianness"
#endif
uint8_t dest[ETH_ALEN];
uint8_t 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 {
uint8_t packet_type;
uint8_t version; /* batman version field */
uint8_t ttl;
uint8_t reserved;
__be32 seqno;
uint8_t 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
* @reserved: Align following fields to 2-byte boundaries
* @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 {
uint8_t packet_type;
uint8_t version; /* batman version field */
uint8_t ttl;
uint8_t first_ttvn;
/* uint8_t first_dest[ETH_ALEN]; - saved in mac header destination */
uint8_t first_source[ETH_ALEN];
uint8_t first_orig_dest[ETH_ALEN];
__be32 first_crc;
uint8_t second_ttl;
uint8_t second_ttvn;
uint8_t second_dest[ETH_ALEN];
uint8_t second_source[ETH_ALEN];
uint8_t 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 {
uint8_t packet_type;
uint8_t version; /* batman version field */
uint8_t ttl;
uint8_t reserved;
uint8_t dst[ETH_ALEN];
uint8_t src[ETH_ALEN];
__be16 tvlv_len;
uint16_t 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 {
uint8_t type;
uint8_t 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
* @vlan_num: 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 {
uint8_t flags;
uint8_t 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;
uint16_t 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 {
uint8_t flags;
uint8_t reserved[3];
uint8_t 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 {
uint8_t 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 {
uint8_t flags;
uint8_t reserved[3];
};
#endif /* _NET_BATMAN_ADV_PACKET_H_ */
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