315 lines
8.9 KiB
C
315 lines
8.9 KiB
C
/* Copyright (C) 2007-2013 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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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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enum batadv_packettype {
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BATADV_IV_OGM = 0x01,
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BATADV_ICMP = 0x02,
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BATADV_UNICAST = 0x03,
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BATADV_BCAST = 0x04,
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BATADV_VIS = 0x05,
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BATADV_UNICAST_FRAG = 0x06,
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BATADV_TT_QUERY = 0x07,
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BATADV_ROAM_ADV = 0x08,
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BATADV_UNICAST_4ADDR = 0x09,
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BATADV_CODED = 0x0a,
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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 14
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enum batadv_iv_flags {
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BATADV_NOT_BEST_NEXT_HOP = BIT(3),
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BATADV_PRIMARIES_FIRST_HOP = BIT(4),
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BATADV_VIS_SERVER = BIT(5),
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BATADV_DIRECTLINK = BIT(6),
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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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/* vis defines */
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enum batadv_vis_packettype {
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BATADV_VIS_TYPE_SERVER_SYNC = 0,
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BATADV_VIS_TYPE_CLIENT_UPDATE = 1,
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};
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/* fragmentation defines */
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enum batadv_unicast_frag_flags {
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BATADV_UNI_FRAG_HEAD = BIT(0),
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BATADV_UNI_FRAG_LARGETAIL = BIT(1),
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};
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/* TT_QUERY subtypes */
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#define BATADV_TT_QUERY_TYPE_MASK 0x3
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enum batadv_tt_query_packettype {
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BATADV_TT_REQUEST = 0,
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BATADV_TT_RESPONSE = 1,
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};
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/* TT_QUERY flags */
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enum batadv_tt_query_flags {
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BATADV_TT_FULL_TABLE = BIT(2),
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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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*/
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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(2),
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BATADV_TT_CLIENT_TEMP = BIT(3),
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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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};
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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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/* 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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struct batadv_header {
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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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/* the parent struct has to add a byte after the header to make
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* everything 4 bytes aligned again
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*/
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};
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struct batadv_ogm_packet {
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struct batadv_header header;
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uint8_t flags; /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
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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 gw_flags; /* flags related to gateway class */
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uint8_t tq;
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uint8_t tt_num_changes;
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uint8_t ttvn; /* translation table version number */
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__be16 tt_crc;
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} __packed;
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#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
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struct batadv_icmp_packet {
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struct batadv_header header;
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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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__be16 seqno;
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uint8_t uid;
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uint8_t reserved;
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};
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#define BATADV_RR_LEN 16
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/* icmp_packet_rr must start with all fields from imcp_packet
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* as this is assumed by code that handles ICMP packets
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*/
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struct batadv_icmp_packet_rr {
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struct batadv_header header;
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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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__be16 seqno;
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uint8_t uid;
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uint8_t rr_cur;
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uint8_t rr[BATADV_RR_LEN][ETH_ALEN];
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};
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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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struct batadv_unicast_packet {
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struct batadv_header header;
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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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struct batadv_unicast_frag_packet {
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struct batadv_header header;
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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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uint8_t flags;
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uint8_t align;
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uint8_t orig[ETH_ALEN];
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__be16 seqno;
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} __packed;
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struct batadv_bcast_packet {
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struct batadv_header header;
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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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#pragma pack()
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struct batadv_vis_packet {
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struct batadv_header header;
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uint8_t vis_type; /* which type of vis-participant sent this? */
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__be32 seqno; /* sequence number */
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uint8_t entries; /* number of entries behind this struct */
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uint8_t reserved;
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uint8_t vis_orig[ETH_ALEN]; /* originator reporting its neighbors */
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uint8_t target_orig[ETH_ALEN]; /* who should receive this packet */
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uint8_t sender_orig[ETH_ALEN]; /* who sent or forwarded this packet */
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};
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struct batadv_tt_query_packet {
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struct batadv_header header;
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/* the flag field is a combination of:
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* - TT_REQUEST or TT_RESPONSE
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* - TT_FULL_TABLE
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*/
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uint8_t flags;
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uint8_t dst[ETH_ALEN];
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uint8_t src[ETH_ALEN];
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/* the ttvn field is:
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* if TT_REQUEST: ttvn that triggered the
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* request
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* if TT_RESPONSE: new ttvn for the src
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* orig_node
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*/
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uint8_t ttvn;
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/* tt_data field is:
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* if TT_REQUEST: crc associated with the
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* ttvn
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* if TT_RESPONSE: table_size
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*/
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__be16 tt_data;
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} __packed;
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struct batadv_roam_adv_packet {
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struct batadv_header header;
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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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uint8_t client[ETH_ALEN];
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} __packed;
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struct batadv_tt_change {
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uint8_t flags;
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uint8_t addr[ETH_ALEN];
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} __packed;
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/**
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* struct batadv_coded_packet - network coded packet
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* @header: common batman packet header and ttl of first included packet
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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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struct batadv_header header;
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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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#endif /* _NET_BATMAN_ADV_PACKET_H_ */
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