net/batman-adv/packet.h

   1 /* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _NET_BATMAN_ADV_PACKET_H_
  19 #define _NET_BATMAN_ADV_PACKET_H_
  20
  21 #include <asm/byteorder.h>
  22 #include <linux/types.h>
  23
  24 /**
  25  * enum batadv_packettype - types for batman-adv encapsulated packets
  26  * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
  27  * @BATADV_BCAST: broadcast packets carrying broadcast payload
  28  * @BATADV_CODED: network coded packets
  29  *
  30  * @BATADV_UNICAST: unicast packets carrying unicast payload traffic
  31  * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
  32  *     payload packet
  33  * @BATADV_UNICAST_4ADDR: unicast packet including the originator address of
  34  *     the sender
  35  * @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute
  36  * @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers
  37  */
  38 enum batadv_packettype {
  39         /* 0x00 - 0x3f: local packets or special rules for handling */
  40         BATADV_IV_OGM           = 0x00,
  41         BATADV_BCAST            = 0x01,
  42         BATADV_CODED            = 0x02,
  43         /* 0x40 - 0x7f: unicast */
  44 #define BATADV_UNICAST_MIN     0x40
  45         BATADV_UNICAST          = 0x40,
  46         BATADV_UNICAST_FRAG     = 0x41,
  47         BATADV_UNICAST_4ADDR    = 0x42,
  48         BATADV_ICMP             = 0x43,
  49         BATADV_UNICAST_TVLV     = 0x44,
  50 #define BATADV_UNICAST_MAX     0x7f
  51         /* 0x80 - 0xff: reserved */
  52 };
  53
  54 /**
  55  * enum batadv_subtype - packet subtype for unicast4addr
  56  * @BATADV_P_DATA: user payload
  57  * @BATADV_P_DAT_DHT_GET: DHT request message
  58  * @BATADV_P_DAT_DHT_PUT: DHT store message
  59  * @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
  60  */
  61 enum batadv_subtype {
  62         BATADV_P_DATA                   = 0x01,
  63         BATADV_P_DAT_DHT_GET            = 0x02,
  64         BATADV_P_DAT_DHT_PUT            = 0x03,
  65         BATADV_P_DAT_CACHE_REPLY        = 0x04,
  66 };
  67
  68 /* this file is included by batctl which needs these defines */
  69 #define BATADV_COMPAT_VERSION 15
  70
  71 /**
  72  * enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets
  73  * @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was
  74  *     previously received from someone else than the best neighbor.
  75  * @BATADV_PRIMARIES_FIRST_HOP: flag is set when the primary interface address
  76  *     is used, and the packet travels its first hop.
  77  * @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a
  78  *     one hop neighbor on the interface where it was originally received.
  79  */
  80 enum batadv_iv_flags {
  81         BATADV_NOT_BEST_NEXT_HOP   = BIT(0),
  82         BATADV_PRIMARIES_FIRST_HOP = BIT(1),
  83         BATADV_DIRECTLINK          = BIT(2),
  84 };
  85
  86 /* ICMP message types */
  87 enum batadv_icmp_packettype {
  88         BATADV_ECHO_REPLY              = 0,
  89         BATADV_DESTINATION_UNREACHABLE = 3,
  90         BATADV_ECHO_REQUEST            = 8,
  91         BATADV_TTL_EXCEEDED            = 11,
  92         BATADV_PARAMETER_PROBLEM       = 12,
  93 };
  94
  95 /**
  96  * enum batadv_mcast_flags - flags for multicast capabilities and settings
  97  * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
  98  *  224.0.0.0/24 or ff02::1
  99  * @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets
 100  * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
 101  */
 102 enum batadv_mcast_flags {
 103         BATADV_MCAST_WANT_ALL_UNSNOOPABLES      = BIT(0),
 104         BATADV_MCAST_WANT_ALL_IPV4              = BIT(1),
 105         BATADV_MCAST_WANT_ALL_IPV6              = BIT(2),
 106 };
 107
 108 /* tt data subtypes */
 109 #define BATADV_TT_DATA_TYPE_MASK 0x0F
 110
 111 /**
 112  * enum batadv_tt_data_flags - flags for tt data tvlv
 113  * @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
 114  * @BATADV_TT_REQUEST: TT request message
 115  * @BATADV_TT_RESPONSE: TT response message
 116  * @BATADV_TT_FULL_TABLE: contains full table to replace existing table
 117  */
 118 enum batadv_tt_data_flags {
 119         BATADV_TT_OGM_DIFF   = BIT(0),
 120         BATADV_TT_REQUEST    = BIT(1),
 121         BATADV_TT_RESPONSE   = BIT(2),
 122         BATADV_TT_FULL_TABLE = BIT(4),
 123 };
 124
 125 /**
 126  * enum batadv_tt_client_flags - TT client specific flags
 127  * @BATADV_TT_CLIENT_DEL: the client has to be deleted from the table
 128  * @BATADV_TT_CLIENT_ROAM: the client roamed to/from another node and the new
 129  *  update telling its new real location has not been received/sent yet
 130  * @BATADV_TT_CLIENT_WIFI: this client is connected through a wifi interface.
 131  *  This information is used by the "AP Isolation" feature
 132  * @BATADV_TT_CLIENT_ISOLA: this client is considered "isolated". This
 133  *  information is used by the Extended Isolation feature
 134  * @BATADV_TT_CLIENT_NOPURGE: this client should never be removed from the table
 135  * @BATADV_TT_CLIENT_NEW: this client has been added to the local table but has
 136  *  not been announced yet
 137  * @BATADV_TT_CLIENT_PENDING: this client is marked for removal but it is kept
 138  *  in the table for one more originator interval for consistency purposes
 139  * @BATADV_TT_CLIENT_TEMP: this global client has been detected to be part of
 140  *  the network but no nnode has already announced it
 141  *
 142  * Bits from 0 to 7 are called _remote flags_ because they are sent on the wire.
 143  * Bits from 8 to 15 are called _local flags_ because they are used for local
 144  * computations only.
 145  *
 146  * Bits from 4 to 7 - a subset of remote flags - are ensured to be in sync with
 147  * the other nodes in the network. To achieve this goal these flags are included
 148  * in the TT CRC computation.
 149  */
 150 enum batadv_tt_client_flags {
 151         BATADV_TT_CLIENT_DEL     = BIT(0),
 152         BATADV_TT_CLIENT_ROAM    = BIT(1),
 153         BATADV_TT_CLIENT_WIFI    = BIT(4),
 154         BATADV_TT_CLIENT_ISOLA   = BIT(5),
 155         BATADV_TT_CLIENT_NOPURGE = BIT(8),
 156         BATADV_TT_CLIENT_NEW     = BIT(9),
 157         BATADV_TT_CLIENT_PENDING = BIT(10),
 158         BATADV_TT_CLIENT_TEMP    = BIT(11),
 159 };
 160
 161 /**
 162  * batadv_vlan_flags - flags for the four MSB of any vlan ID field
 163  * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
 164  */
 165 enum batadv_vlan_flags {
 166         BATADV_VLAN_HAS_TAG     = BIT(15),
 167 };
 168
 169 /* claim frame types for the bridge loop avoidance */
 170 enum batadv_bla_claimframe {
 171         BATADV_CLAIM_TYPE_CLAIM         = 0x00,
 172         BATADV_CLAIM_TYPE_UNCLAIM       = 0x01,
 173         BATADV_CLAIM_TYPE_ANNOUNCE      = 0x02,
 174         BATADV_CLAIM_TYPE_REQUEST       = 0x03,
 175 };
 176
 177 /**
 178  * enum batadv_tvlv_type - tvlv type definitions
 179  * @BATADV_TVLV_GW: gateway tvlv
 180  * @BATADV_TVLV_DAT: distributed arp table tvlv
 181  * @BATADV_TVLV_NC: network coding tvlv
 182  * @BATADV_TVLV_TT: translation table tvlv
 183  * @BATADV_TVLV_ROAM: roaming advertisement tvlv
 184  * @BATADV_TVLV_MCAST: multicast capability tvlv
 185  */
 186 enum batadv_tvlv_type {
 187         BATADV_TVLV_GW          = 0x01,
 188         BATADV_TVLV_DAT         = 0x02,
 189         BATADV_TVLV_NC          = 0x03,
 190         BATADV_TVLV_TT          = 0x04,
 191         BATADV_TVLV_ROAM        = 0x05,
 192         BATADV_TVLV_MCAST       = 0x06,
 193 };
 194
 195 #pragma pack(2)
 196 /* the destination hardware field in the ARP frame is used to
 197  * transport the claim type and the group id
 198  */
 199 struct batadv_bla_claim_dst {
 200         uint8_t magic[3];       /* FF:43:05 */
 201         uint8_t type;           /* bla_claimframe */
 202         __be16 group;           /* group id */
 203 };
 204
 205 #pragma pack()
 206
 207 /**
 208  * struct batadv_ogm_packet - ogm (routing protocol) packet
 209  * @packet_type: batman-adv packet type, part of the general header
 210  * @version: batman-adv protocol version, part of the genereal header
 211  * @ttl: time to live for this packet, part of the genereal header
 212  * @flags: contains routing relevant flags - see enum batadv_iv_flags
 213  * @tvlv_len: length of tvlv data following the ogm header
 214  */
 215 struct batadv_ogm_packet {
 216         uint8_t  packet_type;
 217         uint8_t  version;
 218         uint8_t  ttl;
 219         uint8_t  flags;
 220         __be32   seqno;
 221         uint8_t  orig[ETH_ALEN];
 222         uint8_t  prev_sender[ETH_ALEN];
 223         uint8_t  reserved;
 224         uint8_t  tq;
 225         __be16   tvlv_len;
 226         /* __packed is not needed as the struct size is divisible by 4,
 227          * and the largest data type in this struct has a size of 4.
 228          */
 229 };
 230
 231 #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
 232
 233 /**
 234  * batadv_icmp_header - common members among all the ICMP packets
 235  * @packet_type: batman-adv packet type, part of the general header
 236  * @version: batman-adv protocol version, part of the genereal header
 237  * @ttl: time to live for this packet, part of the genereal header
 238  * @msg_type: ICMP packet type
 239  * @dst: address of the destination node
 240  * @orig: address of the source node
 241  * @uid: local ICMP socket identifier
 242  * @align: not used - useful for alignment purposes only
 243  *
 244  * This structure is used for ICMP packets parsing only and it is never sent
 245  * over the wire. The alignment field at the end is there to ensure that
 246  * members are padded the same way as they are in real packets.
 247  */
 248 struct batadv_icmp_header {
 249         uint8_t  packet_type;
 250         uint8_t  version;
 251         uint8_t  ttl;
 252         uint8_t  msg_type; /* see ICMP message types above */
 253         uint8_t  dst[ETH_ALEN];
 254         uint8_t  orig[ETH_ALEN];
 255         uint8_t  uid;
 256         uint8_t  align[3];
 257 };
 258
 259 /**
 260  * batadv_icmp_packet - ICMP packet
 261  * @packet_type: batman-adv packet type, part of the general header
 262  * @version: batman-adv protocol version, part of the genereal header
 263  * @ttl: time to live for this packet, part of the genereal header
 264  * @msg_type: ICMP packet type
 265  * @dst: address of the destination node
 266  * @orig: address of the source node
 267  * @uid: local ICMP socket identifier
 268  * @reserved: not used - useful for alignment
 269  * @seqno: ICMP sequence number
 270  */
 271 struct batadv_icmp_packet {
 272         uint8_t  packet_type;
 273         uint8_t  version;
 274         uint8_t  ttl;
 275         uint8_t  msg_type; /* see ICMP message types above */
 276         uint8_t  dst[ETH_ALEN];
 277         uint8_t  orig[ETH_ALEN];
 278         uint8_t  uid;
 279         uint8_t  reserved;
 280         __be16   seqno;
 281 };
 282
 283 #define BATADV_RR_LEN 16
 284
 285 /**
 286  * batadv_icmp_packet_rr - ICMP RouteRecord packet
 287  * @packet_type: batman-adv packet type, part of the general header
 288  * @version: batman-adv protocol version, part of the genereal header
 289  * @ttl: time to live for this packet, part of the genereal header
 290  * @msg_type: ICMP packet type
 291  * @dst: address of the destination node
 292  * @orig: address of the source node
 293  * @uid: local ICMP socket identifier
 294  * @rr_cur: number of entries the rr array
 295  * @seqno: ICMP sequence number
 296  * @rr: route record array
 297  */
 298 struct batadv_icmp_packet_rr {
 299         uint8_t  packet_type;
 300         uint8_t  version;
 301         uint8_t  ttl;
 302         uint8_t  msg_type; /* see ICMP message types above */
 303         uint8_t  dst[ETH_ALEN];
 304         uint8_t  orig[ETH_ALEN];
 305         uint8_t  uid;
 306         uint8_t  rr_cur;
 307         __be16   seqno;
 308         uint8_t  rr[BATADV_RR_LEN][ETH_ALEN];
 309 };
 310
 311 #define BATADV_ICMP_MAX_PACKET_SIZE     sizeof(struct batadv_icmp_packet_rr)
 312
 313 /* All packet headers in front of an ethernet header have to be completely
 314  * divisible by 2 but not by 4 to make the payload after the ethernet
 315  * header again 4 bytes boundary aligned.
 316  *
 317  * A packing of 2 is necessary to avoid extra padding at the end of the struct
 318  * caused by a structure member which is larger than two bytes. Otherwise
 319  * the structure would not fulfill the previously mentioned rule to avoid the
 320  * misalignment of the payload after the ethernet header. It may also lead to
 321  * leakage of information when the padding it not initialized before sending.
 322  */
 323 #pragma pack(2)
 324
 325 /**
 326  * struct batadv_unicast_packet - unicast packet for network payload
 327  * @packet_type: batman-adv packet type, part of the general header
 328  * @version: batman-adv protocol version, part of the genereal header
 329  * @ttl: time to live for this packet, part of the genereal header
 330  * @ttvn: translation table version number
 331  * @dest: originator destination of the unicast packet
 332  */
 333 struct batadv_unicast_packet {
 334         uint8_t  packet_type;
 335         uint8_t  version;
 336         uint8_t  ttl;
 337         uint8_t  ttvn; /* destination translation table version number */
 338         uint8_t  dest[ETH_ALEN];
 339         /* "4 bytes boundary + 2 bytes" long to make the payload after the
 340          * following ethernet header again 4 bytes boundary aligned
 341          */
 342 };
 343
 344 /**
 345  * struct batadv_unicast_4addr_packet - extended unicast packet
 346  * @u: common unicast packet header
 347  * @src: address of the source
 348  * @subtype: packet subtype
 349  */
 350 struct batadv_unicast_4addr_packet {
 351         struct batadv_unicast_packet u;
 352         uint8_t src[ETH_ALEN];
 353         uint8_t subtype;
 354         uint8_t reserved;
 355         /* "4 bytes boundary + 2 bytes" long to make the payload after the
 356          * following ethernet header again 4 bytes boundary aligned
 357          */
 358 };
 359
 360 /**
 361  * struct batadv_frag_packet - fragmented packet
 362  * @packet_type: batman-adv packet type, part of the general header
 363  * @version: batman-adv protocol version, part of the genereal header
 364  * @ttl: time to live for this packet, part of the genereal header
 365  * @dest: final destination used when routing fragments
 366  * @orig: originator of the fragment used when merging the packet
 367  * @no: fragment number within this sequence
 368  * @reserved: reserved byte for alignment
 369  * @seqno: sequence identification
 370  * @total_size: size of the merged packet
 371  */
 372 struct batadv_frag_packet {
 373         uint8_t packet_type;
 374         uint8_t version;  /* batman version field */
 375         uint8_t ttl;
 376 #if defined(__BIG_ENDIAN_BITFIELD)
 377         uint8_t no:4;
 378         uint8_t reserved:4;
 379 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 380         uint8_t reserved:4;
 381         uint8_t no:4;
 382 #else
 383 #error "unknown bitfield endianness"
 384 #endif
 385         uint8_t dest[ETH_ALEN];
 386         uint8_t orig[ETH_ALEN];
 387         __be16  seqno;
 388         __be16  total_size;
 389 };
 390
 391 /**
 392  * struct batadv_bcast_packet - broadcast packet for network payload
 393  * @packet_type: batman-adv packet type, part of the general header
 394  * @version: batman-adv protocol version, part of the genereal header
 395  * @ttl: time to live for this packet, part of the genereal header
 396  * @reserved: reserved byte for alignment
 397  * @seqno: sequence identification
 398  * @orig: originator of the broadcast packet
 399  */
 400 struct batadv_bcast_packet {
 401         uint8_t  packet_type;
 402         uint8_t  version;  /* batman version field */
 403         uint8_t  ttl;
 404         uint8_t  reserved;
 405         __be32   seqno;
 406         uint8_t  orig[ETH_ALEN];
 407         /* "4 bytes boundary + 2 bytes" long to make the payload after the
 408          * following ethernet header again 4 bytes boundary aligned
 409          */
 410 };
 411
 412 /**
 413  * struct batadv_coded_packet - network coded packet
 414  * @packet_type: batman-adv packet type, part of the general header
 415  * @version: batman-adv protocol version, part of the genereal header
 416  * @ttl: time to live for this packet, part of the genereal header
 417  * @reserved: Align following fields to 2-byte boundaries
 418  * @first_source: original source of first included packet
 419  * @first_orig_dest: original destinal of first included packet
 420  * @first_crc: checksum of first included packet
 421  * @first_ttvn: tt-version number of first included packet
 422  * @second_ttl: ttl of second packet
 423  * @second_dest: second receiver of this coded packet
 424  * @second_source: original source of second included packet
 425  * @second_orig_dest: original destination of second included packet
 426  * @second_crc: checksum of second included packet
 427  * @second_ttvn: tt version number of second included packet
 428  * @coded_len: length of network coded part of the payload
 429  */
 430 struct batadv_coded_packet {
 431         uint8_t  packet_type;
 432         uint8_t  version;  /* batman version field */
 433         uint8_t  ttl;
 434         uint8_t  first_ttvn;
 435         /* uint8_t  first_dest[ETH_ALEN]; - saved in mac header destination */
 436         uint8_t  first_source[ETH_ALEN];
 437         uint8_t  first_orig_dest[ETH_ALEN];
 438         __be32   first_crc;
 439         uint8_t  second_ttl;
 440         uint8_t  second_ttvn;
 441         uint8_t  second_dest[ETH_ALEN];
 442         uint8_t  second_source[ETH_ALEN];
 443         uint8_t  second_orig_dest[ETH_ALEN];
 444         __be32   second_crc;
 445         __be16   coded_len;
 446 };
 447
 448 #pragma pack()
 449
 450 /**
 451  * struct batadv_unicast_tvlv - generic unicast packet with tvlv payload
 452  * @packet_type: batman-adv packet type, part of the general header
 453  * @version: batman-adv protocol version, part of the genereal header
 454  * @ttl: time to live for this packet, part of the genereal header
 455  * @reserved: reserved field (for packet alignment)
 456  * @src: address of the source
 457  * @dst: address of the destination
 458  * @tvlv_len: length of tvlv data following the unicast tvlv header
 459  * @align: 2 bytes to align the header to a 4 byte boundary
 460  */
 461 struct batadv_unicast_tvlv_packet {
 462         uint8_t  packet_type;
 463         uint8_t  version;  /* batman version field */
 464         uint8_t  ttl;
 465         uint8_t  reserved;
 466         uint8_t  dst[ETH_ALEN];
 467         uint8_t  src[ETH_ALEN];
 468         __be16   tvlv_len;
 469         uint16_t align;
 470 };
 471
 472 /**
 473  * struct batadv_tvlv_hdr - base tvlv header struct
 474  * @type: tvlv container type (see batadv_tvlv_type)
 475  * @version: tvlv container version
 476  * @len: tvlv container length
 477  */
 478 struct batadv_tvlv_hdr {
 479         uint8_t type;
 480         uint8_t version;
 481         __be16  len;
 482 };
 483
 484 /**
 485  * struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv
 486  *  container
 487  * @bandwidth_down: advertised uplink download bandwidth
 488  * @bandwidth_up: advertised uplink upload bandwidth
 489  */
 490 struct batadv_tvlv_gateway_data {
 491         __be32 bandwidth_down;
 492         __be32 bandwidth_up;
 493 };
 494
 495 /**
 496  * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
 497  * @flags: translation table flags (see batadv_tt_data_flags)
 498  * @ttvn: translation table version number
 499  * @vlan_num: number of announced VLANs. In the TVLV this struct is followed by
 500  *  one batadv_tvlv_tt_vlan_data object per announced vlan
 501  */
 502 struct batadv_tvlv_tt_data {
 503         uint8_t flags;
 504         uint8_t ttvn;
 505         __be16  num_vlan;
 506 };
 507
 508 /**
 509  * struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through
 510  *  the tt tvlv container
 511  * @crc: crc32 checksum of the entries belonging to this vlan
 512  * @vid: vlan identifier
 513  * @reserved: unused, useful for alignment purposes
 514  */
 515 struct batadv_tvlv_tt_vlan_data {
 516         __be32  crc;
 517         __be16  vid;
 518         uint16_t reserved;
 519 };
 520
 521 /**
 522  * struct batadv_tvlv_tt_change - translation table diff data
 523  * @flags: status indicators concerning the non-mesh client (see
 524  *  batadv_tt_client_flags)
 525  * @reserved: reserved field - useful for alignment purposes only
 526  * @addr: mac address of non-mesh client that triggered this tt change
 527  * @vid: VLAN identifier
 528  */
 529 struct batadv_tvlv_tt_change {
 530         uint8_t flags;
 531         uint8_t reserved[3];
 532         uint8_t addr[ETH_ALEN];
 533         __be16 vid;
 534 };
 535
 536 /**
 537  * struct batadv_tvlv_roam_adv - roaming advertisement
 538  * @client: mac address of roaming client
 539  * @vid: VLAN identifier
 540  */
 541 struct batadv_tvlv_roam_adv {
 542         uint8_t  client[ETH_ALEN];
 543         __be16 vid;
 544 };
 545
 546 /**
 547  * struct batadv_tvlv_mcast_data - payload of a multicast tvlv
 548  * @flags: multicast flags announced by the orig node
 549  * @reserved: reserved field
 550  */
 551 struct batadv_tvlv_mcast_data {
 552         uint8_t flags;
 553         uint8_t reserved[3];
 554 };
 555
 556 #endif /* _NET_BATMAN_ADV_PACKET_H_ */