508 строки
16 KiB
C
508 строки
16 KiB
C
/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _NET_BATMAN_ADV_PACKET_H_
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#define _NET_BATMAN_ADV_PACKET_H_
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/**
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* enum batadv_packettype - types for batman-adv encapsulated packets
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* @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
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* @BATADV_BCAST: broadcast packets carrying broadcast payload
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* @BATADV_CODED: network coded packets
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*
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* @BATADV_UNICAST: unicast packets carrying unicast payload traffic
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* @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
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* payload packet
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* @BATADV_UNICAST_4ADDR: unicast packet including the originator address of
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* the sender
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* @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute
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* @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers
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*/
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enum batadv_packettype {
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/* 0x00 - 0x3f: local packets or special rules for handling */
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BATADV_IV_OGM = 0x00,
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BATADV_BCAST = 0x01,
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BATADV_CODED = 0x02,
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/* 0x40 - 0x7f: unicast */
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#define BATADV_UNICAST_MIN 0x40
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BATADV_UNICAST = 0x40,
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BATADV_UNICAST_FRAG = 0x41,
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BATADV_UNICAST_4ADDR = 0x42,
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BATADV_ICMP = 0x43,
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BATADV_UNICAST_TVLV = 0x44,
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#define BATADV_UNICAST_MAX 0x7f
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/* 0x80 - 0xff: reserved */
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};
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/**
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* enum batadv_subtype - packet subtype for unicast4addr
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* @BATADV_P_DATA: user payload
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* @BATADV_P_DAT_DHT_GET: DHT request message
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* @BATADV_P_DAT_DHT_PUT: DHT store message
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* @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
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*/
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enum batadv_subtype {
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BATADV_P_DATA = 0x01,
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BATADV_P_DAT_DHT_GET = 0x02,
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BATADV_P_DAT_DHT_PUT = 0x03,
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BATADV_P_DAT_CACHE_REPLY = 0x04,
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};
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/* this file is included by batctl which needs these defines */
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#define BATADV_COMPAT_VERSION 15
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/**
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* enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets
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* @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was
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* previously received from someone else than the best neighbor.
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* @BATADV_PRIMARIES_FIRST_HOP: flag is set when the primary interface address
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* is used, and the packet travels its first hop.
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* @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a
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* one hop neighbor on the interface where it was originally received.
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*/
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enum batadv_iv_flags {
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BATADV_NOT_BEST_NEXT_HOP = BIT(0),
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BATADV_PRIMARIES_FIRST_HOP = BIT(1),
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BATADV_DIRECTLINK = BIT(2),
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};
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/* ICMP message types */
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enum batadv_icmp_packettype {
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BATADV_ECHO_REPLY = 0,
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BATADV_DESTINATION_UNREACHABLE = 3,
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BATADV_ECHO_REQUEST = 8,
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BATADV_TTL_EXCEEDED = 11,
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BATADV_PARAMETER_PROBLEM = 12,
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};
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/* tt data subtypes */
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#define BATADV_TT_DATA_TYPE_MASK 0x0F
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/**
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* enum batadv_tt_data_flags - flags for tt data tvlv
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* @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
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* @BATADV_TT_REQUEST: TT request message
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* @BATADV_TT_RESPONSE: TT response message
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* @BATADV_TT_FULL_TABLE: contains full table to replace existing table
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*/
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enum batadv_tt_data_flags {
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BATADV_TT_OGM_DIFF = BIT(0),
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BATADV_TT_REQUEST = BIT(1),
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BATADV_TT_RESPONSE = BIT(2),
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BATADV_TT_FULL_TABLE = BIT(4),
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};
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/* BATADV_TT_CLIENT flags.
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* Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to
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* BIT(15) are used for local computation only.
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* Flags from BIT(4) to BIT(7) are kept in sync with the rest of the network.
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*/
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enum batadv_tt_client_flags {
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BATADV_TT_CLIENT_DEL = BIT(0),
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BATADV_TT_CLIENT_ROAM = BIT(1),
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BATADV_TT_CLIENT_WIFI = BIT(4),
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BATADV_TT_CLIENT_ISOLA = BIT(5),
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BATADV_TT_CLIENT_NOPURGE = BIT(8),
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BATADV_TT_CLIENT_NEW = BIT(9),
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BATADV_TT_CLIENT_PENDING = BIT(10),
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BATADV_TT_CLIENT_TEMP = BIT(11),
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};
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/**
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* batadv_vlan_flags - flags for the four MSB of any vlan ID field
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* @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
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*/
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enum batadv_vlan_flags {
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BATADV_VLAN_HAS_TAG = BIT(15),
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};
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/* claim frame types for the bridge loop avoidance */
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enum batadv_bla_claimframe {
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BATADV_CLAIM_TYPE_CLAIM = 0x00,
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BATADV_CLAIM_TYPE_UNCLAIM = 0x01,
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BATADV_CLAIM_TYPE_ANNOUNCE = 0x02,
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BATADV_CLAIM_TYPE_REQUEST = 0x03,
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};
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/**
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* enum batadv_tvlv_type - tvlv type definitions
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* @BATADV_TVLV_GW: gateway tvlv
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* @BATADV_TVLV_DAT: distributed arp table tvlv
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* @BATADV_TVLV_NC: network coding tvlv
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* @BATADV_TVLV_TT: translation table tvlv
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* @BATADV_TVLV_ROAM: roaming advertisement tvlv
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*/
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enum batadv_tvlv_type {
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BATADV_TVLV_GW = 0x01,
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BATADV_TVLV_DAT = 0x02,
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BATADV_TVLV_NC = 0x03,
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BATADV_TVLV_TT = 0x04,
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BATADV_TVLV_ROAM = 0x05,
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};
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#pragma pack(2)
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/* the destination hardware field in the ARP frame is used to
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* transport the claim type and the group id
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*/
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struct batadv_bla_claim_dst {
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uint8_t magic[3]; /* FF:43:05 */
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uint8_t type; /* bla_claimframe */
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__be16 group; /* group id */
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};
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#pragma pack()
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/**
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* struct batadv_ogm_packet - ogm (routing protocol) packet
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @flags: contains routing relevant flags - see enum batadv_iv_flags
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* @tvlv_len: length of tvlv data following the ogm header
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*/
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struct batadv_ogm_packet {
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uint8_t packet_type;
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uint8_t version;
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uint8_t ttl;
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uint8_t flags;
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__be32 seqno;
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uint8_t orig[ETH_ALEN];
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uint8_t prev_sender[ETH_ALEN];
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uint8_t reserved;
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uint8_t tq;
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__be16 tvlv_len;
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/* __packed is not needed as the struct size is divisible by 4,
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* and the largest data type in this struct has a size of 4.
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*/
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};
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#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
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/**
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* batadv_icmp_header - common members among all the ICMP packets
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @msg_type: ICMP packet type
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* @dst: address of the destination node
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* @orig: address of the source node
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* @uid: local ICMP socket identifier
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* @align: not used - useful for alignment purposes only
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*
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* This structure is used for ICMP packets parsing only and it is never sent
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* over the wire. The alignment field at the end is there to ensure that
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* members are padded the same way as they are in real packets.
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*/
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struct batadv_icmp_header {
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uint8_t packet_type;
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uint8_t version;
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uint8_t ttl;
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uint8_t msg_type; /* see ICMP message types above */
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uint8_t dst[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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uint8_t uid;
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uint8_t align[3];
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};
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/**
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* batadv_icmp_packet - ICMP packet
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @msg_type: ICMP packet type
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* @dst: address of the destination node
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* @orig: address of the source node
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* @uid: local ICMP socket identifier
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* @reserved: not used - useful for alignment
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* @seqno: ICMP sequence number
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*/
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struct batadv_icmp_packet {
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uint8_t packet_type;
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uint8_t version;
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uint8_t ttl;
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uint8_t msg_type; /* see ICMP message types above */
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uint8_t dst[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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uint8_t uid;
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uint8_t reserved;
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__be16 seqno;
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};
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#define BATADV_RR_LEN 16
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/**
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* batadv_icmp_packet_rr - ICMP RouteRecord packet
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @msg_type: ICMP packet type
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* @dst: address of the destination node
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* @orig: address of the source node
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* @uid: local ICMP socket identifier
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* @rr_cur: number of entries the rr array
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* @seqno: ICMP sequence number
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* @rr: route record array
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*/
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struct batadv_icmp_packet_rr {
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uint8_t packet_type;
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uint8_t version;
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uint8_t ttl;
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uint8_t msg_type; /* see ICMP message types above */
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uint8_t dst[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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uint8_t uid;
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uint8_t rr_cur;
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__be16 seqno;
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uint8_t rr[BATADV_RR_LEN][ETH_ALEN];
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};
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#define BATADV_ICMP_MAX_PACKET_SIZE sizeof(struct batadv_icmp_packet_rr)
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/* All packet headers in front of an ethernet header have to be completely
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* divisible by 2 but not by 4 to make the payload after the ethernet
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* header again 4 bytes boundary aligned.
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*
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* A packing of 2 is necessary to avoid extra padding at the end of the struct
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* caused by a structure member which is larger than two bytes. Otherwise
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* the structure would not fulfill the previously mentioned rule to avoid the
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* misalignment of the payload after the ethernet header. It may also lead to
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* leakage of information when the padding it not initialized before sending.
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*/
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#pragma pack(2)
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/**
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* struct batadv_unicast_packet - unicast packet for network payload
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @ttvn: translation table version number
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* @dest: originator destination of the unicast packet
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*/
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struct batadv_unicast_packet {
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uint8_t packet_type;
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uint8_t version;
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uint8_t ttl;
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uint8_t ttvn; /* destination translation table version number */
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uint8_t dest[ETH_ALEN];
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/* "4 bytes boundary + 2 bytes" long to make the payload after the
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* following ethernet header again 4 bytes boundary aligned
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*/
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};
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/**
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* struct batadv_unicast_4addr_packet - extended unicast packet
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* @u: common unicast packet header
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* @src: address of the source
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* @subtype: packet subtype
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*/
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struct batadv_unicast_4addr_packet {
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struct batadv_unicast_packet u;
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uint8_t src[ETH_ALEN];
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uint8_t subtype;
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uint8_t reserved;
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/* "4 bytes boundary + 2 bytes" long to make the payload after the
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* following ethernet header again 4 bytes boundary aligned
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*/
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};
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/**
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* struct batadv_frag_packet - fragmented packet
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @dest: final destination used when routing fragments
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* @orig: originator of the fragment used when merging the packet
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* @no: fragment number within this sequence
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* @reserved: reserved byte for alignment
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* @seqno: sequence identification
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* @total_size: size of the merged packet
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*/
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struct batadv_frag_packet {
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uint8_t packet_type;
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uint8_t version; /* batman version field */
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uint8_t ttl;
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#if defined(__BIG_ENDIAN_BITFIELD)
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uint8_t no:4;
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uint8_t reserved:4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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uint8_t reserved:4;
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uint8_t no:4;
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#else
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#error "unknown bitfield endianess"
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#endif
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uint8_t dest[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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__be16 seqno;
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__be16 total_size;
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};
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/**
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* struct batadv_bcast_packet - broadcast packet for network payload
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @reserved: reserved byte for alignment
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* @seqno: sequence identification
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* @orig: originator of the broadcast packet
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*/
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struct batadv_bcast_packet {
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uint8_t packet_type;
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uint8_t version; /* batman version field */
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uint8_t ttl;
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uint8_t reserved;
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__be32 seqno;
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uint8_t orig[ETH_ALEN];
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/* "4 bytes boundary + 2 bytes" long to make the payload after the
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* following ethernet header again 4 bytes boundary aligned
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*/
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};
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/**
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* struct batadv_coded_packet - network coded packet
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @reserved: Align following fields to 2-byte boundaries
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* @first_source: original source of first included packet
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* @first_orig_dest: original destinal of first included packet
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* @first_crc: checksum of first included packet
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* @first_ttvn: tt-version number of first included packet
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* @second_ttl: ttl of second packet
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* @second_dest: second receiver of this coded packet
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* @second_source: original source of second included packet
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* @second_orig_dest: original destination of second included packet
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* @second_crc: checksum of second included packet
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* @second_ttvn: tt version number of second included packet
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* @coded_len: length of network coded part of the payload
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*/
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struct batadv_coded_packet {
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uint8_t packet_type;
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uint8_t version; /* batman version field */
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uint8_t ttl;
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uint8_t first_ttvn;
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/* uint8_t first_dest[ETH_ALEN]; - saved in mac header destination */
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uint8_t first_source[ETH_ALEN];
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uint8_t first_orig_dest[ETH_ALEN];
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__be32 first_crc;
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uint8_t second_ttl;
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uint8_t second_ttvn;
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uint8_t second_dest[ETH_ALEN];
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uint8_t second_source[ETH_ALEN];
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uint8_t second_orig_dest[ETH_ALEN];
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__be32 second_crc;
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__be16 coded_len;
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};
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#pragma pack()
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/**
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* struct batadv_unicast_tvlv - generic unicast packet with tvlv payload
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* @packet_type: batman-adv packet type, part of the general header
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* @version: batman-adv protocol version, part of the genereal header
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* @ttl: time to live for this packet, part of the genereal header
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* @reserved: reserved field (for packet alignment)
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* @src: address of the source
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* @dst: address of the destination
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* @tvlv_len: length of tvlv data following the unicast tvlv header
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* @align: 2 bytes to align the header to a 4 byte boundry
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*/
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struct batadv_unicast_tvlv_packet {
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uint8_t packet_type;
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uint8_t version; /* batman version field */
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uint8_t ttl;
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uint8_t reserved;
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uint8_t dst[ETH_ALEN];
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uint8_t src[ETH_ALEN];
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__be16 tvlv_len;
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uint16_t align;
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};
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/**
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* struct batadv_tvlv_hdr - base tvlv header struct
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* @type: tvlv container type (see batadv_tvlv_type)
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* @version: tvlv container version
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* @len: tvlv container length
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*/
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struct batadv_tvlv_hdr {
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uint8_t type;
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uint8_t version;
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__be16 len;
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};
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/**
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* struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv
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* container
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* @bandwidth_down: advertised uplink download bandwidth
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* @bandwidth_up: advertised uplink upload bandwidth
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*/
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struct batadv_tvlv_gateway_data {
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__be32 bandwidth_down;
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__be32 bandwidth_up;
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};
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/**
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* struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
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* @flags: translation table flags (see batadv_tt_data_flags)
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* @ttvn: translation table version number
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* @vlan_num: number of announced VLANs. In the TVLV this struct is followed by
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* one batadv_tvlv_tt_vlan_data object per announced vlan
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*/
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struct batadv_tvlv_tt_data {
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uint8_t flags;
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uint8_t ttvn;
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__be16 num_vlan;
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};
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/**
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* struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through
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* the tt tvlv container
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* @crc: crc32 checksum of the entries belonging to this vlan
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* @vid: vlan identifier
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* @reserved: unused, useful for alignment purposes
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*/
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struct batadv_tvlv_tt_vlan_data {
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__be32 crc;
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__be16 vid;
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uint16_t reserved;
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};
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/**
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* struct batadv_tvlv_tt_change - translation table diff data
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* @flags: status indicators concerning the non-mesh client (see
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* batadv_tt_client_flags)
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* @reserved: reserved field - useful for alignment purposes only
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* @addr: mac address of non-mesh client that triggered this tt change
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* @vid: VLAN identifier
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*/
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struct batadv_tvlv_tt_change {
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uint8_t flags;
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uint8_t reserved[3];
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uint8_t addr[ETH_ALEN];
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__be16 vid;
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};
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/**
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* struct batadv_tvlv_roam_adv - roaming advertisement
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* @client: mac address of roaming client
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* @vid: VLAN identifier
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*/
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struct batadv_tvlv_roam_adv {
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uint8_t client[ETH_ALEN];
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__be16 vid;
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};
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#endif /* _NET_BATMAN_ADV_PACKET_H_ */
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