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batadv_packet.h
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/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) */ /* Copyright (C) 2007-2018 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 _LINUX_BATADV_PACKET_H_ #define _LINUX_BATADV_PACKET_H_ #include <asm/byteorder.h> #include <linux/if_ether.h> #include <linux/types.h> /** * batadv_tp_is_error() - Check throughput meter return code for error * @n: throughput meter return code * * Return: 0 when not error was detected, != 0 otherwise */ #define batadv_tp_is_error(n) ((__u8)(n) > 127 ? 1 : 0) /** * enum batadv_packettype - types for batman-adv encapsulated packets * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV * @BATADV_BCAST: broadcast packets carrying broadcast payload * @BATADV_CODED: network coded packets * @BATADV_ELP: echo location packets for B.A.T.M.A.N. V * @BATADV_OGM2: originator messages for B.A.T.M.A.N. V * * @BATADV_UNICAST: unicast packets carrying unicast payload traffic * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original * payload packet * @BATADV_UNICAST_4ADDR: unicast packet including the originator address of * the sender * @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute * @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers */ enum batadv_packettype { /* 0x00 - 0x3f: local packets or special rules for handling */ BATADV_IV_OGM = 0x00, BATADV_BCAST = 0x01, BATADV_CODED = 0x02, BATADV_ELP = 0x03, BATADV_OGM2 = 0x04, /* 0x40 - 0x7f: unicast */ #define BATADV_UNICAST_MIN 0x40 BATADV_UNICAST = 0x40, BATADV_UNICAST_FRAG = 0x41, BATADV_UNICAST_4ADDR = 0x42, BATADV_ICMP = 0x43, BATADV_UNICAST_TVLV = 0x44, #define BATADV_UNICAST_MAX 0x7f /* 0x80 - 0xff: reserved */ }; /** * enum batadv_subtype - packet subtype for unicast4addr * @BATADV_P_DATA: user payload * @BATADV_P_DAT_DHT_GET: DHT request message * @BATADV_P_DAT_DHT_PUT: DHT store message * @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT */ enum batadv_subtype { BATADV_P_DATA = 0x01, BATADV_P_DAT_DHT_GET = 0x02, BATADV_P_DAT_DHT_PUT = 0x03, BATADV_P_DAT_CACHE_REPLY = 0x04, }; /* this file is included by batctl which needs these defines */ #define BATADV_COMPAT_VERSION 15 /** * enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets * @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was * previously received from someone else 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 * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets */ 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, }; /* tt data subtypes */ #define BATADV_TT_DATA_TYPE_MASK 0x0F /** * enum batadv_tt_data_flags - flags for tt data tvlv * @BATADV_TT_OGM_DIFF: TT diff propagated through OGM * @BATADV_TT_REQUEST: TT request message * @BATADV_TT_RESPONSE: TT response message * @BATADV_TT_FULL_TABLE: contains full table to replace existing table */ enum batadv_tt_data_flags { BATADV_TT_OGM_DIFF = 1UL << 0, BATADV_TT_REQUEST = 1UL << 1, BATADV_TT_RESPONSE = 1UL << 2, BATADV_TT_FULL_TABLE = 1UL << 4, }; /** * enum batadv_vlan_flags - flags for the four MSB of any vlan ID field * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not */ enum batadv_vlan_flags { BATADV_VLAN_HAS_TAG = 1UL << 15, }; /** * enum batadv_bla_claimframe - claim frame types for the bridge loop avoidance * @BATADV_CLAIM_TYPE_CLAIM: claim of a client mac address * @BATADV_CLAIM_TYPE_UNCLAIM: unclaim of a client mac address * @BATADV_CLAIM_TYPE_ANNOUNCE: announcement of backbone with current crc * @BATADV_CLAIM_TYPE_REQUEST: request of full claim table * @BATADV_CLAIM_TYPE_LOOPDETECT: mesh-traversing loop detect packet */ enum batadv_bla_claimframe { BATADV_CLAIM_TYPE_CLAIM = 0x00, BATADV_CLAIM_TYPE_UNCLAIM = 0x01, BATADV_CLAIM_TYPE_ANNOUNCE = 0x02, BATADV_CLAIM_TYPE_REQUEST = 0x03, BATADV_CLAIM_TYPE_LOOPDETECT = 0x04, }; /** * enum batadv_tvlv_type - tvlv type definitions * @BATADV_TVLV_GW: gateway tvlv * @BATADV_TVLV_DAT: distributed arp table tvlv * @BATADV_TVLV_NC: network coding tvlv * @BATADV_TVLV_TT: translation table tvlv * @BATADV_TVLV_ROAM: roaming advertisement tvlv * @BATADV_TVLV_MCAST: multicast capability tvlv */ enum batadv_tvlv_type { BATADV_TVLV_GW = 0x01, BATADV_TVLV_DAT = 0x02, BATADV_TVLV_NC = 0x03, BATADV_TVLV_TT = 0x04, BATADV_TVLV_ROAM = 0x05, BATADV_TVLV_MCAST = 0x06, }; #pragma pack(2) /* the destination hardware field in the ARP frame is used to * transport the claim type and the group id */ struct batadv_bla_claim_dst { __u8 magic[3]; /* FF:43:05 */ __u8 type; /* bla_claimframe */ __be16 group; /* group id */ }; /** * struct batadv_ogm_packet - ogm (routing protocol) packet * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal 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: reseved 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 genereal 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 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 { __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 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 { __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 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 * @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 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 { __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 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 { __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 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 * @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 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 { __u8 packet_type; __u8 version; /* batman version field */ __u8 ttl; __u8 reserved; __be32 seqno; __u8 orig[ETH_ALEN]; /* "4 bytes boundary + 2 bytes" long to make the payload after the * following ethernet header again 4 bytes boundary aligned */ }; /** * struct batadv_coded_packet - network coded packet * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header * @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 { __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 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 { __u8 packet_type; __u8 version; /* batman version field */ __u8 ttl; __u8 reserved; __u8 dst[ETH_ALEN]; __u8 src[ETH_ALEN]; __be16 tvlv_len; __u16 align; }; /** * struct batadv_tvlv_hdr - base tvlv header struct * @type: tvlv container type (see batadv_tvlv_type) * @version: tvlv container version * @len: tvlv container length */ struct batadv_tvlv_hdr { __u8 type; __u8 version; __be16 len; }; /** * struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv * container * @bandwidth_down: advertised uplink download bandwidth * @bandwidth_up: advertised uplink upload bandwidth */ struct batadv_tvlv_gateway_data { __be32 bandwidth_down; __be32 bandwidth_up; }; /** * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container * @flags: translation table flags (see batadv_tt_data_flags) * @ttvn: translation table version number * @num_vlan: number of announced VLANs. In the TVLV this struct is followed by * one batadv_tvlv_tt_vlan_data object per announced vlan */ struct batadv_tvlv_tt_data { __u8 flags; __u8 ttvn; __be16 num_vlan; }; /** * struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through * the tt tvlv container * @crc: crc32 checksum of the entries belonging to this vlan * @vid: vlan identifier * @reserved: unused, useful for alignment purposes */ struct batadv_tvlv_tt_vlan_data { __be32 crc; __be16 vid; __u16 reserved; }; /** * struct batadv_tvlv_tt_change - translation table diff data * @flags: status indicators concerning the non-mesh client (see * batadv_tt_client_flags) * @reserved: reserved field - useful for alignment purposes only * @addr: mac address of non-mesh client that triggered this tt change * @vid: VLAN identifier */ struct batadv_tvlv_tt_change { __u8 flags; __u8 reserved[3]; __u8 addr[ETH_ALEN]; __be16 vid; }; /** * struct batadv_tvlv_roam_adv - roaming advertisement * @client: mac address of roaming client * @vid: VLAN identifier */ struct batadv_tvlv_roam_adv { __u8 client[ETH_ALEN]; __be16 vid; }; /** * struct batadv_tvlv_mcast_data - payload of a multicast tvlv * @flags: multicast flags announced by the orig node * @reserved: reserved field */ struct batadv_tvlv_mcast_data { __u8 flags; __u8 reserved[3]; }; #pragma pack() #endif /* _LINUX_BATADV_PACKET_H_ */