1 /* Copyright (C) 2007-2016 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 #define batadv_tp_is_error(n) ((u8)n > 127 ? 1 : 0) 25 26 /** 27 * enum batadv_packettype - types for batman-adv encapsulated packets 28 * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV 29 * @BATADV_BCAST: broadcast packets carrying broadcast payload 30 * @BATADV_CODED: network coded packets 31 * @BATADV_ELP: echo location packets for B.A.T.M.A.N. V 32 * @BATADV_OGM2: originator messages for B.A.T.M.A.N. V 33 * 34 * @BATADV_UNICAST: unicast packets carrying unicast payload traffic 35 * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original 36 * payload packet 37 * @BATADV_UNICAST_4ADDR: unicast packet including the originator address of 38 * the sender 39 * @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute 40 * @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers 41 */ 42 enum batadv_packettype { 43 /* 0x00 - 0x3f: local packets or special rules for handling */ 44 BATADV_IV_OGM = 0x00, 45 BATADV_BCAST = 0x01, 46 BATADV_CODED = 0x02, 47 BATADV_ELP = 0x03, 48 BATADV_OGM2 = 0x04, 49 /* 0x40 - 0x7f: unicast */ 50 #define BATADV_UNICAST_MIN 0x40 51 BATADV_UNICAST = 0x40, 52 BATADV_UNICAST_FRAG = 0x41, 53 BATADV_UNICAST_4ADDR = 0x42, 54 BATADV_ICMP = 0x43, 55 BATADV_UNICAST_TVLV = 0x44, 56 #define BATADV_UNICAST_MAX 0x7f 57 /* 0x80 - 0xff: reserved */ 58 }; 59 60 /** 61 * enum batadv_subtype - packet subtype for unicast4addr 62 * @BATADV_P_DATA: user payload 63 * @BATADV_P_DAT_DHT_GET: DHT request message 64 * @BATADV_P_DAT_DHT_PUT: DHT store message 65 * @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT 66 */ 67 enum batadv_subtype { 68 BATADV_P_DATA = 0x01, 69 BATADV_P_DAT_DHT_GET = 0x02, 70 BATADV_P_DAT_DHT_PUT = 0x03, 71 BATADV_P_DAT_CACHE_REPLY = 0x04, 72 }; 73 74 /* this file is included by batctl which needs these defines */ 75 #define BATADV_COMPAT_VERSION 15 76 77 /** 78 * enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets 79 * @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was 80 * previously received from someone else than the best neighbor. 81 * @BATADV_PRIMARIES_FIRST_HOP: flag unused. 82 * @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a 83 * one hop neighbor on the interface where it was originally received. 84 */ 85 enum batadv_iv_flags { 86 BATADV_NOT_BEST_NEXT_HOP = BIT(0), 87 BATADV_PRIMARIES_FIRST_HOP = BIT(1), 88 BATADV_DIRECTLINK = BIT(2), 89 }; 90 91 /* ICMP message types */ 92 enum batadv_icmp_packettype { 93 BATADV_ECHO_REPLY = 0, 94 BATADV_DESTINATION_UNREACHABLE = 3, 95 BATADV_ECHO_REQUEST = 8, 96 BATADV_TTL_EXCEEDED = 11, 97 BATADV_PARAMETER_PROBLEM = 12, 98 BATADV_TP = 15, 99 }; 100 101 /** 102 * enum batadv_mcast_flags - flags for multicast capabilities and settings 103 * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for 104 * 224.0.0.0/24 or ff02::1 105 * @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets 106 * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets 107 */ 108 enum batadv_mcast_flags { 109 BATADV_MCAST_WANT_ALL_UNSNOOPABLES = BIT(0), 110 BATADV_MCAST_WANT_ALL_IPV4 = BIT(1), 111 BATADV_MCAST_WANT_ALL_IPV6 = BIT(2), 112 }; 113 114 /* tt data subtypes */ 115 #define BATADV_TT_DATA_TYPE_MASK 0x0F 116 117 /** 118 * enum batadv_tt_data_flags - flags for tt data tvlv 119 * @BATADV_TT_OGM_DIFF: TT diff propagated through OGM 120 * @BATADV_TT_REQUEST: TT request message 121 * @BATADV_TT_RESPONSE: TT response message 122 * @BATADV_TT_FULL_TABLE: contains full table to replace existing table 123 */ 124 enum batadv_tt_data_flags { 125 BATADV_TT_OGM_DIFF = BIT(0), 126 BATADV_TT_REQUEST = BIT(1), 127 BATADV_TT_RESPONSE = BIT(2), 128 BATADV_TT_FULL_TABLE = BIT(4), 129 }; 130 131 /** 132 * enum batadv_vlan_flags - flags for the four MSB of any vlan ID field 133 * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not 134 */ 135 enum batadv_vlan_flags { 136 BATADV_VLAN_HAS_TAG = BIT(15), 137 }; 138 139 /* claim frame types for the bridge loop avoidance */ 140 enum batadv_bla_claimframe { 141 BATADV_CLAIM_TYPE_CLAIM = 0x00, 142 BATADV_CLAIM_TYPE_UNCLAIM = 0x01, 143 BATADV_CLAIM_TYPE_ANNOUNCE = 0x02, 144 BATADV_CLAIM_TYPE_REQUEST = 0x03, 145 BATADV_CLAIM_TYPE_LOOPDETECT = 0x04, 146 }; 147 148 /** 149 * enum batadv_tvlv_type - tvlv type definitions 150 * @BATADV_TVLV_GW: gateway tvlv 151 * @BATADV_TVLV_DAT: distributed arp table tvlv 152 * @BATADV_TVLV_NC: network coding tvlv 153 * @BATADV_TVLV_TT: translation table tvlv 154 * @BATADV_TVLV_ROAM: roaming advertisement tvlv 155 * @BATADV_TVLV_MCAST: multicast capability tvlv 156 */ 157 enum batadv_tvlv_type { 158 BATADV_TVLV_GW = 0x01, 159 BATADV_TVLV_DAT = 0x02, 160 BATADV_TVLV_NC = 0x03, 161 BATADV_TVLV_TT = 0x04, 162 BATADV_TVLV_ROAM = 0x05, 163 BATADV_TVLV_MCAST = 0x06, 164 }; 165 166 #pragma pack(2) 167 /* the destination hardware field in the ARP frame is used to 168 * transport the claim type and the group id 169 */ 170 struct batadv_bla_claim_dst { 171 u8 magic[3]; /* FF:43:05 */ 172 u8 type; /* bla_claimframe */ 173 __be16 group; /* group id */ 174 }; 175 176 #pragma pack() 177 178 /** 179 * struct batadv_ogm_packet - ogm (routing protocol) packet 180 * @packet_type: batman-adv packet type, part of the general header 181 * @version: batman-adv protocol version, part of the genereal header 182 * @ttl: time to live for this packet, part of the genereal header 183 * @flags: contains routing relevant flags - see enum batadv_iv_flags 184 * @seqno: sequence identification 185 * @orig: address of the source node 186 * @prev_sender: address of the previous sender 187 * @reserved: reserved byte for alignment 188 * @tq: transmission quality 189 * @tvlv_len: length of tvlv data following the ogm header 190 */ 191 struct batadv_ogm_packet { 192 u8 packet_type; 193 u8 version; 194 u8 ttl; 195 u8 flags; 196 __be32 seqno; 197 u8 orig[ETH_ALEN]; 198 u8 prev_sender[ETH_ALEN]; 199 u8 reserved; 200 u8 tq; 201 __be16 tvlv_len; 202 /* __packed is not needed as the struct size is divisible by 4, 203 * and the largest data type in this struct has a size of 4. 204 */ 205 }; 206 207 #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet) 208 209 /** 210 * struct batadv_ogm2_packet - ogm2 (routing protocol) packet 211 * @packet_type: batman-adv packet type, part of the general header 212 * @version: batman-adv protocol version, part of the general header 213 * @ttl: time to live for this packet, part of the general header 214 * @flags: reseved for routing relevant flags - currently always 0 215 * @seqno: sequence number 216 * @orig: originator mac address 217 * @tvlv_len: length of the appended tvlv buffer (in bytes) 218 * @throughput: the currently flooded path throughput 219 */ 220 struct batadv_ogm2_packet { 221 u8 packet_type; 222 u8 version; 223 u8 ttl; 224 u8 flags; 225 __be32 seqno; 226 u8 orig[ETH_ALEN]; 227 __be16 tvlv_len; 228 __be32 throughput; 229 /* __packed is not needed as the struct size is divisible by 4, 230 * and the largest data type in this struct has a size of 4. 231 */ 232 }; 233 234 #define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_packet) 235 236 /** 237 * struct batadv_elp_packet - elp (neighbor discovery) packet 238 * @packet_type: batman-adv packet type, part of the general header 239 * @version: batman-adv protocol version, part of the genereal header 240 * @orig: originator mac address 241 * @seqno: sequence number 242 * @elp_interval: currently used ELP sending interval in ms 243 */ 244 struct batadv_elp_packet { 245 u8 packet_type; 246 u8 version; 247 u8 orig[ETH_ALEN]; 248 __be32 seqno; 249 __be32 elp_interval; 250 }; 251 252 #define BATADV_ELP_HLEN sizeof(struct batadv_elp_packet) 253 254 /** 255 * enum batadv_icmp_user_cmd_type - types for batman-adv icmp cmd modes 256 * @BATADV_TP_START: start a throughput meter run 257 * @BATADV_TP_STOP: stop a throughput meter run 258 */ 259 enum batadv_icmp_user_cmd_type { 260 BATADV_TP_START = 0, 261 BATADV_TP_STOP = 2, 262 }; 263 264 /** 265 * struct batadv_icmp_header - common members among all the ICMP packets 266 * @packet_type: batman-adv packet type, part of the general header 267 * @version: batman-adv protocol version, part of the genereal header 268 * @ttl: time to live for this packet, part of the genereal header 269 * @msg_type: ICMP packet type 270 * @dst: address of the destination node 271 * @orig: address of the source node 272 * @uid: local ICMP socket identifier 273 * @align: not used - useful for alignment purposes only 274 * 275 * This structure is used for ICMP packets parsing only and it is never sent 276 * over the wire. The alignment field at the end is there to ensure that 277 * members are padded the same way as they are in real packets. 278 */ 279 struct batadv_icmp_header { 280 u8 packet_type; 281 u8 version; 282 u8 ttl; 283 u8 msg_type; /* see ICMP message types above */ 284 u8 dst[ETH_ALEN]; 285 u8 orig[ETH_ALEN]; 286 u8 uid; 287 u8 align[3]; 288 }; 289 290 /** 291 * struct batadv_icmp_packet - ICMP packet 292 * @packet_type: batman-adv packet type, part of the general header 293 * @version: batman-adv protocol version, part of the genereal header 294 * @ttl: time to live for this packet, part of the genereal header 295 * @msg_type: ICMP packet type 296 * @dst: address of the destination node 297 * @orig: address of the source node 298 * @uid: local ICMP socket identifier 299 * @reserved: not used - useful for alignment 300 * @seqno: ICMP sequence number 301 */ 302 struct batadv_icmp_packet { 303 u8 packet_type; 304 u8 version; 305 u8 ttl; 306 u8 msg_type; /* see ICMP message types above */ 307 u8 dst[ETH_ALEN]; 308 u8 orig[ETH_ALEN]; 309 u8 uid; 310 u8 reserved; 311 __be16 seqno; 312 }; 313 314 /** 315 * struct batadv_icmp_tp_packet - ICMP TP Meter packet 316 * @packet_type: batman-adv packet type, part of the general header 317 * @version: batman-adv protocol version, part of the genereal header 318 * @ttl: time to live for this packet, part of the genereal header 319 * @msg_type: ICMP packet type 320 * @dst: address of the destination node 321 * @orig: address of the source node 322 * @uid: local ICMP socket identifier 323 * @subtype: TP packet subtype (see batadv_icmp_tp_subtype) 324 * @session: TP session identifier 325 * @seqno: the TP sequence number 326 * @timestamp: time when the packet has been sent. This value is filled in a 327 * TP_MSG and echoed back in the next TP_ACK so that the sender can compute the 328 * RTT. Since it is read only by the host which wrote it, there is no need to 329 * store it using network order 330 */ 331 struct batadv_icmp_tp_packet { 332 u8 packet_type; 333 u8 version; 334 u8 ttl; 335 u8 msg_type; /* see ICMP message types above */ 336 u8 dst[ETH_ALEN]; 337 u8 orig[ETH_ALEN]; 338 u8 uid; 339 u8 subtype; 340 u8 session[2]; 341 __be32 seqno; 342 __be32 timestamp; 343 }; 344 345 /** 346 * enum batadv_icmp_tp_subtype - ICMP TP Meter packet subtypes 347 * @BATADV_TP_MSG: Msg from sender to receiver 348 * @BATADV_TP_ACK: acknowledgment from receiver to sender 349 */ 350 enum batadv_icmp_tp_subtype { 351 BATADV_TP_MSG = 0, 352 BATADV_TP_ACK, 353 }; 354 355 #define BATADV_RR_LEN 16 356 357 /** 358 * struct batadv_icmp_packet_rr - ICMP RouteRecord packet 359 * @packet_type: batman-adv packet type, part of the general header 360 * @version: batman-adv protocol version, part of the genereal header 361 * @ttl: time to live for this packet, part of the genereal header 362 * @msg_type: ICMP packet type 363 * @dst: address of the destination node 364 * @orig: address of the source node 365 * @uid: local ICMP socket identifier 366 * @rr_cur: number of entries the rr array 367 * @seqno: ICMP sequence number 368 * @rr: route record array 369 */ 370 struct batadv_icmp_packet_rr { 371 u8 packet_type; 372 u8 version; 373 u8 ttl; 374 u8 msg_type; /* see ICMP message types above */ 375 u8 dst[ETH_ALEN]; 376 u8 orig[ETH_ALEN]; 377 u8 uid; 378 u8 rr_cur; 379 __be16 seqno; 380 u8 rr[BATADV_RR_LEN][ETH_ALEN]; 381 }; 382 383 #define BATADV_ICMP_MAX_PACKET_SIZE sizeof(struct batadv_icmp_packet_rr) 384 385 /* All packet headers in front of an ethernet header have to be completely 386 * divisible by 2 but not by 4 to make the payload after the ethernet 387 * header again 4 bytes boundary aligned. 388 * 389 * A packing of 2 is necessary to avoid extra padding at the end of the struct 390 * caused by a structure member which is larger than two bytes. Otherwise 391 * the structure would not fulfill the previously mentioned rule to avoid the 392 * misalignment of the payload after the ethernet header. It may also lead to 393 * leakage of information when the padding it not initialized before sending. 394 */ 395 #pragma pack(2) 396 397 /** 398 * struct batadv_unicast_packet - unicast packet for network payload 399 * @packet_type: batman-adv packet type, part of the general header 400 * @version: batman-adv protocol version, part of the genereal header 401 * @ttl: time to live for this packet, part of the genereal header 402 * @ttvn: translation table version number 403 * @dest: originator destination of the unicast packet 404 */ 405 struct batadv_unicast_packet { 406 u8 packet_type; 407 u8 version; 408 u8 ttl; 409 u8 ttvn; /* destination translation table version number */ 410 u8 dest[ETH_ALEN]; 411 /* "4 bytes boundary + 2 bytes" long to make the payload after the 412 * following ethernet header again 4 bytes boundary aligned 413 */ 414 }; 415 416 /** 417 * struct batadv_unicast_4addr_packet - extended unicast packet 418 * @u: common unicast packet header 419 * @src: address of the source 420 * @subtype: packet subtype 421 * @reserved: reserved byte for alignment 422 */ 423 struct batadv_unicast_4addr_packet { 424 struct batadv_unicast_packet u; 425 u8 src[ETH_ALEN]; 426 u8 subtype; 427 u8 reserved; 428 /* "4 bytes boundary + 2 bytes" long to make the payload after the 429 * following ethernet header again 4 bytes boundary aligned 430 */ 431 }; 432 433 /** 434 * struct batadv_frag_packet - fragmented packet 435 * @packet_type: batman-adv packet type, part of the general header 436 * @version: batman-adv protocol version, part of the genereal header 437 * @ttl: time to live for this packet, part of the genereal header 438 * @dest: final destination used when routing fragments 439 * @orig: originator of the fragment used when merging the packet 440 * @no: fragment number within this sequence 441 * @priority: priority of frame, from ToS IP precedence or 802.1p 442 * @reserved: reserved byte for alignment 443 * @seqno: sequence identification 444 * @total_size: size of the merged packet 445 */ 446 struct batadv_frag_packet { 447 u8 packet_type; 448 u8 version; /* batman version field */ 449 u8 ttl; 450 #if defined(__BIG_ENDIAN_BITFIELD) 451 u8 no:4; 452 u8 priority:3; 453 u8 reserved:1; 454 #elif defined(__LITTLE_ENDIAN_BITFIELD) 455 u8 reserved:1; 456 u8 priority:3; 457 u8 no:4; 458 #else 459 #error "unknown bitfield endianness" 460 #endif 461 u8 dest[ETH_ALEN]; 462 u8 orig[ETH_ALEN]; 463 __be16 seqno; 464 __be16 total_size; 465 }; 466 467 /** 468 * struct batadv_bcast_packet - broadcast packet for network payload 469 * @packet_type: batman-adv packet type, part of the general header 470 * @version: batman-adv protocol version, part of the genereal header 471 * @ttl: time to live for this packet, part of the genereal header 472 * @reserved: reserved byte for alignment 473 * @seqno: sequence identification 474 * @orig: originator of the broadcast packet 475 */ 476 struct batadv_bcast_packet { 477 u8 packet_type; 478 u8 version; /* batman version field */ 479 u8 ttl; 480 u8 reserved; 481 __be32 seqno; 482 u8 orig[ETH_ALEN]; 483 /* "4 bytes boundary + 2 bytes" long to make the payload after the 484 * following ethernet header again 4 bytes boundary aligned 485 */ 486 }; 487 488 /** 489 * struct batadv_coded_packet - network coded packet 490 * @packet_type: batman-adv packet type, part of the general header 491 * @version: batman-adv protocol version, part of the genereal header 492 * @ttl: time to live for this packet, part of the genereal header 493 * @first_source: original source of first included packet 494 * @first_orig_dest: original destinal of first included packet 495 * @first_crc: checksum of first included packet 496 * @first_ttvn: tt-version number of first included packet 497 * @second_ttl: ttl of second packet 498 * @second_dest: second receiver of this coded packet 499 * @second_source: original source of second included packet 500 * @second_orig_dest: original destination of second included packet 501 * @second_crc: checksum of second included packet 502 * @second_ttvn: tt version number of second included packet 503 * @coded_len: length of network coded part of the payload 504 */ 505 struct batadv_coded_packet { 506 u8 packet_type; 507 u8 version; /* batman version field */ 508 u8 ttl; 509 u8 first_ttvn; 510 /* u8 first_dest[ETH_ALEN]; - saved in mac header destination */ 511 u8 first_source[ETH_ALEN]; 512 u8 first_orig_dest[ETH_ALEN]; 513 __be32 first_crc; 514 u8 second_ttl; 515 u8 second_ttvn; 516 u8 second_dest[ETH_ALEN]; 517 u8 second_source[ETH_ALEN]; 518 u8 second_orig_dest[ETH_ALEN]; 519 __be32 second_crc; 520 __be16 coded_len; 521 }; 522 523 #pragma pack() 524 525 /** 526 * struct batadv_unicast_tvlv_packet - generic unicast packet with tvlv payload 527 * @packet_type: batman-adv packet type, part of the general header 528 * @version: batman-adv protocol version, part of the genereal header 529 * @ttl: time to live for this packet, part of the genereal header 530 * @reserved: reserved field (for packet alignment) 531 * @src: address of the source 532 * @dst: address of the destination 533 * @tvlv_len: length of tvlv data following the unicast tvlv header 534 * @align: 2 bytes to align the header to a 4 byte boundary 535 */ 536 struct batadv_unicast_tvlv_packet { 537 u8 packet_type; 538 u8 version; /* batman version field */ 539 u8 ttl; 540 u8 reserved; 541 u8 dst[ETH_ALEN]; 542 u8 src[ETH_ALEN]; 543 __be16 tvlv_len; 544 u16 align; 545 }; 546 547 /** 548 * struct batadv_tvlv_hdr - base tvlv header struct 549 * @type: tvlv container type (see batadv_tvlv_type) 550 * @version: tvlv container version 551 * @len: tvlv container length 552 */ 553 struct batadv_tvlv_hdr { 554 u8 type; 555 u8 version; 556 __be16 len; 557 }; 558 559 /** 560 * struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv 561 * container 562 * @bandwidth_down: advertised uplink download bandwidth 563 * @bandwidth_up: advertised uplink upload bandwidth 564 */ 565 struct batadv_tvlv_gateway_data { 566 __be32 bandwidth_down; 567 __be32 bandwidth_up; 568 }; 569 570 /** 571 * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container 572 * @flags: translation table flags (see batadv_tt_data_flags) 573 * @ttvn: translation table version number 574 * @num_vlan: number of announced VLANs. In the TVLV this struct is followed by 575 * one batadv_tvlv_tt_vlan_data object per announced vlan 576 */ 577 struct batadv_tvlv_tt_data { 578 u8 flags; 579 u8 ttvn; 580 __be16 num_vlan; 581 }; 582 583 /** 584 * struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through 585 * the tt tvlv container 586 * @crc: crc32 checksum of the entries belonging to this vlan 587 * @vid: vlan identifier 588 * @reserved: unused, useful for alignment purposes 589 */ 590 struct batadv_tvlv_tt_vlan_data { 591 __be32 crc; 592 __be16 vid; 593 u16 reserved; 594 }; 595 596 /** 597 * struct batadv_tvlv_tt_change - translation table diff data 598 * @flags: status indicators concerning the non-mesh client (see 599 * batadv_tt_client_flags) 600 * @reserved: reserved field - useful for alignment purposes only 601 * @addr: mac address of non-mesh client that triggered this tt change 602 * @vid: VLAN identifier 603 */ 604 struct batadv_tvlv_tt_change { 605 u8 flags; 606 u8 reserved[3]; 607 u8 addr[ETH_ALEN]; 608 __be16 vid; 609 }; 610 611 /** 612 * struct batadv_tvlv_roam_adv - roaming advertisement 613 * @client: mac address of roaming client 614 * @vid: VLAN identifier 615 */ 616 struct batadv_tvlv_roam_adv { 617 u8 client[ETH_ALEN]; 618 __be16 vid; 619 }; 620 621 /** 622 * struct batadv_tvlv_mcast_data - payload of a multicast tvlv 623 * @flags: multicast flags announced by the orig node 624 * @reserved: reserved field 625 */ 626 struct batadv_tvlv_mcast_data { 627 u8 flags; 628 u8 reserved[3]; 629 }; 630 631 #endif /* _NET_BATMAN_ADV_PACKET_H_ */ 632