ieee80211_mesh.h revision 267654
1/*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Rui Paulo under sponsorship from the 6 * FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: releng/9.3/sys/net80211/ieee80211_mesh.h 202178 2010-01-12 22:22:27Z rpaulo $ 30 */ 31#ifndef _NET80211_IEEE80211_MESH_H_ 32#define _NET80211_IEEE80211_MESH_H_ 33 34#define IEEE80211_MESH_DEFAULT_TTL 31 35 36/* 37 * NB: all structures are __packed so sizeof works on arm, et. al. 38 */ 39/* 40 * 802.11s Information Elements. 41*/ 42/* Mesh Configuration */ 43struct ieee80211_meshconf_ie { 44 uint8_t conf_ie; /* IEEE80211_ELEMID_MESHCONF */ 45 uint8_t conf_len; 46 uint8_t conf_pselid; /* Active Path Sel. Proto. ID */ 47 uint8_t conf_pmetid; /* Active Metric Identifier */ 48 uint8_t conf_ccid; /* Congestion Control Mode ID */ 49 uint8_t conf_syncid; /* Sync. Protocol ID */ 50 uint8_t conf_authid; /* Auth. Protocol ID */ 51 uint8_t conf_form; /* Formation Information */ 52 uint16_t conf_cap; 53} __packed; 54 55/* Hybrid Wireless Mesh Protocol */ 56#define IEEE80211_MESHCONF_PATH_HWMP 0x00 57/* Airtime Link Metric */ 58#define IEEE80211_MESHCONF_METRIC_AIRTIME 0x00 59/* Congestion Control */ 60#define IEEE80211_MESHCONF_CC_DISABLED 0x00 61#define IEEE80211_MESHCONF_CC_SIG 0x01 62/* Neighbour Offset */ 63#define IEEE80211_MESHCONF_SYNC_NEIGHOFF 0x00 64#define IEEE80211_MESHCONF_AUTH_DISABLED 0x00 65/* Simultaneous Authenticaction of Equals */ 66#define IEEE80211_MESHCONF_AUTH_SAE 0x01 67#define IEEE80211_MESHCONF_FORM_MP 0x01 /* Connected to Portal */ 68#define IEEE80211_MESHCONF_FORM_NNEIGH_MASK 0x04 /* Number of Neighbours */ 69#define IEEE80211_MESHCONF_CAP_AP 0x01 /* Accepting Peers */ 70#define IEEE80211_MESHCONF_CAP_MCCAS 0x02 /* MCCA supported */ 71#define IEEE80211_MESHCONF_CAP_MCCAE 0x04 /* MCCA enabled */ 72#define IEEE80211_MESHCONF_CAP_FWRD 0x08 /* forwarding enabled */ 73#define IEEE80211_MESHCONF_CAP_BTR 0x10 /* Beacon Timing Report Enab */ 74#define IEEE80211_MESHCONF_CAP_TBTTA 0x20 /* TBTT Adj. Enabled */ 75#define IEEE80211_MESHCONF_CAP_TBTT 0x40 /* TBTT Adjusting */ 76#define IEEE80211_MESHCONF_CAP_PSL 0x80 /* Power Save Level */ 77 78/* Mesh Identifier */ 79struct ieee80211_meshid_ie { 80 uint8_t id_ie; /* IEEE80211_ELEMID_MESHID */ 81 uint8_t id_len; 82} __packed; 83 84/* Link Metric Report */ 85struct ieee80211_meshlmetric_ie { 86 uint8_t lm_ie; /* IEEE80211_ELEMID_MESHLINK */ 87 uint8_t lm_len; 88 uint32_t lm_metric; 89#define IEEE80211_MESHLMETRIC_INITIALVAL 0 90} __packed; 91 92/* Congestion Notification */ 93struct ieee80211_meshcngst_ie { 94 uint8_t cngst_ie; /* IEEE80211_ELEMID_MESHCNGST */ 95 uint8_t cngst_len; 96 uint16_t cngst_timer[4]; /* Expiration Timers: AC_BK, 97 AC_BE, AC_VI, AC_VO */ 98} __packed; 99 100/* Peer Link Management */ 101struct ieee80211_meshpeer_ie { 102 uint8_t peer_ie; /* IEEE80211_ELEMID_MESHPEER */ 103 uint8_t peer_len; 104 uint8_t peer_proto[4]; /* Peer Management Protocol */ 105 uint16_t peer_llinkid; /* Local Link ID */ 106 uint16_t peer_linkid; /* Peer Link ID */ 107 uint16_t peer_rcode; 108} __packed; 109 110enum { 111 IEEE80211_MESH_PEER_LINK_OPEN = 0, 112 IEEE80211_MESH_PEER_LINK_CONFIRM = 1, 113 IEEE80211_MESH_PEER_LINK_CLOSE = 2, 114 /* values 3-255 are reserved */ 115}; 116 117/* Mesh Peering Management Protocol */ 118#define IEEE80211_MESH_PEER_PROTO_OUI 0x00, 0x0f, 0xac 119#define IEEE80211_MESH_PEER_PROTO_VALUE 0x2a 120#define IEEE80211_MESH_PEER_PROTO { IEEE80211_MESH_PEER_PROTO_OUI, \ 121 IEEE80211_MESH_PEER_PROTO_VALUE } 122/* Abbreviated Handshake Protocol */ 123#define IEEE80211_MESH_PEER_PROTO_AH_OUI 0x00, 0x0f, 0xac 124#define IEEE80211_MESH_PEER_PROTO_AH_VALUE 0x2b 125#define IEEE80211_MESH_PEER_PROTO_AH { IEEE80211_MESH_PEER_PROTO_AH_OUI, \ 126 IEEE80211_MESH_PEER_PROTO_AH_VALUE } 127#ifdef notyet 128/* Mesh Channel Switch Annoucement */ 129struct ieee80211_meshcsa_ie { 130 uint8_t csa_ie; /* IEEE80211_ELEMID_MESHCSA */ 131 uint8_t csa_len; 132 uint8_t csa_mode; 133 uint8_t csa_newclass; /* New Regulatory Class */ 134 uint8_t csa_newchan; 135 uint8_t csa_precvalue; /* Precedence Value */ 136 uint8_t csa_count; 137} __packed; 138 139/* Mesh TIM */ 140/* Equal to the non Mesh version */ 141 142/* Mesh Awake Window */ 143struct ieee80211_meshawakew_ie { 144 uint8_t awakew_ie; /* IEEE80211_ELEMID_MESHAWAKEW */ 145 uint8_t awakew_len; 146 uint8_t awakew_windowlen; /* in TUs */ 147} __packed; 148 149/* Mesh Beacon Timing */ 150struct ieee80211_meshbeacont_ie { 151 uint8_t beacont_ie; /* IEEE80211_ELEMID_MESHBEACONT */ 152 uint8_t beacont_len; 153 struct { 154 uint8_t mp_aid; /* Least Octet of AID */ 155 uint16_t mp_btime; /* Beacon Time */ 156 uint16_t mp_bint; /* Beacon Interval */ 157 } __packed mp[1]; /* NB: variable size */ 158} __packed; 159#endif 160 161/* Portal (MP) Annoucement */ 162struct ieee80211_meshpann_ie { 163 uint8_t pann_ie; /* IEEE80211_ELEMID_MESHPANN */ 164 uint8_t pann_len; 165 uint8_t pann_flags; 166 uint8_t pann_hopcount; 167 uint8_t pann_ttl; 168 uint8_t pann_addr[IEEE80211_ADDR_LEN]; 169 uint8_t pann_seq; /* PANN Sequence Number */ 170} __packed; 171 172/* Root (MP) Annoucement */ 173struct ieee80211_meshrann_ie { 174 uint8_t rann_ie; /* IEEE80211_ELEMID_MESHRANN */ 175 uint8_t rann_len; 176 uint8_t rann_flags; 177#define IEEE80211_MESHRANN_FLAGS_PR 0x01 /* Portal Role */ 178 uint8_t rann_hopcount; 179 uint8_t rann_ttl; 180 uint8_t rann_addr[IEEE80211_ADDR_LEN]; 181 uint32_t rann_seq; /* HWMP Sequence Number */ 182 uint32_t rann_metric; 183} __packed; 184 185/* Mesh Path Request */ 186struct ieee80211_meshpreq_ie { 187 uint8_t preq_ie; /* IEEE80211_ELEMID_MESHPREQ */ 188 uint8_t preq_len; 189 uint8_t preq_flags; 190#define IEEE80211_MESHPREQ_FLAGS_PR 0x01 /* Portal Role */ 191#define IEEE80211_MESHPREQ_FLAGS_AM 0x02 /* 0 = ucast / 1 = bcast */ 192#define IEEE80211_MESHPREQ_FLAGS_PP 0x04 /* Proactive PREP */ 193#define IEEE80211_MESHPREQ_FLAGS_AE 0x40 /* Address Extension */ 194 uint8_t preq_hopcount; 195 uint8_t preq_ttl; 196 uint32_t preq_id; 197 uint8_t preq_origaddr[IEEE80211_ADDR_LEN]; 198 uint32_t preq_origseq; /* HWMP Sequence Number */ 199 /* NB: may have Originator Proxied Address */ 200 uint32_t preq_lifetime; 201 uint32_t preq_metric; 202 uint8_t preq_tcount; /* target count */ 203 struct { 204 uint8_t target_flags; 205#define IEEE80211_MESHPREQ_TFLAGS_TO 0x01 /* Target Only */ 206#define IEEE80211_MESHPREQ_TFLAGS_RF 0x02 /* Reply and Forward */ 207#define IEEE80211_MESHPREQ_TFLAGS_USN 0x04 /* Unknown HWMP seq number */ 208 uint8_t target_addr[IEEE80211_ADDR_LEN]; 209 uint32_t target_seq; /* HWMP Sequence Number */ 210 } __packed preq_targets[1]; /* NB: variable size */ 211} __packed; 212 213/* Mesh Path Reply */ 214struct ieee80211_meshprep_ie { 215 uint8_t prep_ie; /* IEEE80211_ELEMID_MESHPREP */ 216 uint8_t prep_len; 217 uint8_t prep_flags; 218 uint8_t prep_hopcount; 219 uint8_t prep_ttl; 220 uint8_t prep_targetaddr[IEEE80211_ADDR_LEN]; 221 uint32_t prep_targetseq; 222 /* NB: May have Target Proxied Address */ 223 uint32_t prep_lifetime; 224 uint32_t prep_metric; 225 uint8_t prep_origaddr[IEEE80211_ADDR_LEN]; 226 uint32_t prep_origseq; /* HWMP Sequence Number */ 227} __packed; 228 229/* Mesh Path Error */ 230struct ieee80211_meshperr_ie { 231 uint8_t perr_ie; /* IEEE80211_ELEMID_MESHPERR */ 232 uint8_t perr_len; 233 uint8_t perr_ttl; 234 uint8_t perr_ndests; /* Number of Destinations */ 235 struct { 236 uint8_t dest_flags; 237#define IEEE80211_MESHPERR_DFLAGS_USN 0x01 238#define IEEE80211_MESHPERR_DFLAGS_RC 0x02 239 uint8_t dest_addr[IEEE80211_ADDR_LEN]; 240 uint32_t dest_seq; /* HWMP Sequence Number */ 241 uint16_t dest_rcode; 242 } __packed perr_dests[1]; /* NB: variable size */ 243} __packed; 244 245#ifdef notyet 246/* Mesh Proxy Update */ 247struct ieee80211_meshpu_ie { 248 uint8_t pu_ie; /* IEEE80211_ELEMID_MESHPU */ 249 uint8_t pu_len; 250 uint8_t pu_flags; 251#define IEEE80211_MESHPU_FLAGS_MASK 0x1 252#define IEEE80211_MESHPU_FLAGS_DEL 0x0 253#define IEEE80211_MESHPU_FLAGS_ADD 0x1 254 uint8_t pu_seq; /* PU Sequence Number */ 255 uint8_t pu_addr[IEEE80211_ADDR_LEN]; 256 uint8_t pu_naddr; /* Number of Proxied Addresses */ 257 /* NB: proxied address follows */ 258} __packed; 259 260/* Mesh Proxy Update Confirmation */ 261struct ieee80211_meshpuc_ie { 262 uint8_t puc_ie; /* IEEE80211_ELEMID_MESHPUC */ 263 uint8_t puc_len; 264 uint8_t puc_flags; 265 uint8_t puc_seq; /* PU Sequence Number */ 266 uint8_t puc_daddr[IEEE80211_ADDR_LEN]; 267} __packed; 268#endif 269 270/* 271 * 802.11s Action Frames 272 */ 273#define IEEE80211_ACTION_CAT_MESHPEERING 30 /* XXX Linux */ 274#define IEEE80211_ACTION_CAT_MESHLMETRIC 13 275#define IEEE80211_ACTION_CAT_MESHPATH 32 /* XXX Linux */ 276#define IEEE80211_ACTION_CAT_INTERWORK 15 277#define IEEE80211_ACTION_CAT_RESOURCE 16 278#define IEEE80211_ACTION_CAT_PROXY 17 279 280/* 281 * Mesh Peering Action codes. 282 */ 283enum { 284 IEEE80211_ACTION_MESHPEERING_OPEN = 0, 285 IEEE80211_ACTION_MESHPEERING_CONFIRM = 1, 286 IEEE80211_ACTION_MESHPEERING_CLOSE = 2, 287 /* 3-255 reserved */ 288}; 289 290/* 291 * Mesh Path Selection Action code. 292 */ 293enum { 294 IEEE80211_ACTION_MESHPATH_SEL = 0, 295 /* 1-255 reserved */ 296}; 297 298/* 299 * Mesh Link Metric Action codes. 300 */ 301enum { 302 IEEE80211_ACTION_MESHLMETRIC_REQ = 0, /* Link Metric Request */ 303 IEEE80211_ACTION_MESHLMETRIC_REP = 1, /* Link Metric Report */ 304 /* 2-255 reserved */ 305}; 306 307/* 308 * Mesh Portal Annoucement Action codes. 309 */ 310enum { 311 IEEE80211_ACTION_MESHPANN = 0, 312 /* 1-255 reserved */ 313}; 314 315/* 316 * Different mesh control structures based on the AE 317 * (Address Extension) bits. 318 */ 319struct ieee80211_meshcntl { 320 uint8_t mc_flags; /* Address Extension 00 */ 321 uint8_t mc_ttl; /* TTL */ 322 uint8_t mc_seq[4]; /* Sequence No. */ 323 /* NB: more addresses may follow */ 324} __packed; 325 326struct ieee80211_meshcntl_ae01 { 327 uint8_t mc_flags; /* Address Extension 01 */ 328 uint8_t mc_ttl; /* TTL */ 329 uint8_t mc_seq[4]; /* Sequence No. */ 330 uint8_t mc_addr4[IEEE80211_ADDR_LEN]; 331} __packed; 332 333struct ieee80211_meshcntl_ae10 { 334 uint8_t mc_flags; /* Address Extension 10 */ 335 uint8_t mc_ttl; /* TTL */ 336 uint8_t mc_seq[4]; /* Sequence No. */ 337 uint8_t mc_addr4[IEEE80211_ADDR_LEN]; 338 uint8_t mc_addr5[IEEE80211_ADDR_LEN]; 339} __packed; 340 341struct ieee80211_meshcntl_ae11 { 342 uint8_t mc_flags; /* Address Extension 11 */ 343 uint8_t mc_ttl; /* TTL */ 344 uint8_t mc_seq[4]; /* Sequence No. */ 345 uint8_t mc_addr4[IEEE80211_ADDR_LEN]; 346 uint8_t mc_addr5[IEEE80211_ADDR_LEN]; 347 uint8_t mc_addr6[IEEE80211_ADDR_LEN]; 348} __packed; 349 350#ifdef _KERNEL 351MALLOC_DECLARE(M_80211_MESH_RT); 352struct ieee80211_mesh_route { 353 TAILQ_ENTRY(ieee80211_mesh_route) rt_next; 354 int rt_crtime; /* creation time */ 355 uint8_t rt_dest[IEEE80211_ADDR_LEN]; 356 uint8_t rt_nexthop[IEEE80211_ADDR_LEN]; 357 uint32_t rt_metric; /* path metric */ 358 uint16_t rt_nhops; /* number of hops */ 359 uint16_t rt_flags; 360#define IEEE80211_MESHRT_FLAGS_VALID 0x01 /* patch discovery complete */ 361#define IEEE80211_MESHRT_FLAGS_PROXY 0x02 /* proxy entry */ 362 uint32_t rt_lifetime; 363 uint32_t rt_lastmseq; /* last seq# seen dest */ 364 void *rt_priv; /* private data */ 365}; 366#define IEEE80211_MESH_ROUTE_PRIV(rt, cast) ((cast *)rt->rt_priv) 367 368#define IEEE80211_MESH_PROTO_DSZ 12 /* description size */ 369/* 370 * Mesh Path Selection Protocol. 371 */ 372enum ieee80211_state; 373struct ieee80211_mesh_proto_path { 374 uint8_t mpp_active; 375 char mpp_descr[IEEE80211_MESH_PROTO_DSZ]; 376 uint8_t mpp_ie; 377 struct ieee80211_node * 378 (*mpp_discover)(struct ieee80211vap *, 379 const uint8_t [IEEE80211_ADDR_LEN], 380 struct mbuf *); 381 void (*mpp_peerdown)(struct ieee80211_node *); 382 void (*mpp_vattach)(struct ieee80211vap *); 383 void (*mpp_vdetach)(struct ieee80211vap *); 384 int (*mpp_newstate)(struct ieee80211vap *, 385 enum ieee80211_state, int); 386 const size_t mpp_privlen; /* size required in the routing table 387 for private data */ 388 int mpp_inact; /* inact. timeout for invalid routes 389 (ticks) */ 390}; 391 392/* 393 * Mesh Link Metric Report Protocol. 394 */ 395struct ieee80211_mesh_proto_metric { 396 uint8_t mpm_active; 397 char mpm_descr[IEEE80211_MESH_PROTO_DSZ]; 398 uint8_t mpm_ie; 399 uint32_t (*mpm_metric)(struct ieee80211_node *); 400}; 401 402#ifdef notyet 403/* 404 * Mesh Authentication Protocol. 405 */ 406struct ieee80211_mesh_proto_auth { 407 uint8_t mpa_ie[4]; 408}; 409 410struct ieee80211_mesh_proto_congestion { 411}; 412 413struct ieee80211_mesh_proto_sync { 414}; 415#endif 416 417typedef uint32_t ieee80211_mesh_seq; 418#define IEEE80211_MESH_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 419#define IEEE80211_MESH_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 420 421struct ieee80211_mesh_state { 422 int ms_idlen; 423 uint8_t ms_id[IEEE80211_MESHID_LEN]; 424 ieee80211_mesh_seq ms_seq; /* seq no for meshcntl */ 425 uint16_t ms_neighbors; 426 uint8_t ms_ttl; /* mesh ttl set in packets */ 427#define IEEE80211_MESHFLAGS_AP 0x01 /* accept peers */ 428#define IEEE80211_MESHFLAGS_PORTAL 0x02 /* mesh portal role */ 429#define IEEE80211_MESHFLAGS_FWD 0x04 /* forward packets */ 430 uint8_t ms_flags; 431 struct mtx ms_rt_lock; 432 struct callout ms_cleantimer; 433 TAILQ_HEAD(, ieee80211_mesh_route) ms_routes; 434 struct ieee80211_mesh_proto_metric *ms_pmetric; 435 struct ieee80211_mesh_proto_path *ms_ppath; 436}; 437void ieee80211_mesh_attach(struct ieee80211com *); 438void ieee80211_mesh_detach(struct ieee80211com *); 439 440struct ieee80211_mesh_route * 441 ieee80211_mesh_rt_find(struct ieee80211vap *, 442 const uint8_t [IEEE80211_ADDR_LEN]); 443struct ieee80211_mesh_route * 444 ieee80211_mesh_rt_add(struct ieee80211vap *, 445 const uint8_t [IEEE80211_ADDR_LEN]); 446void ieee80211_mesh_rt_del(struct ieee80211vap *, 447 const uint8_t [IEEE80211_ADDR_LEN]); 448void ieee80211_mesh_rt_flush(struct ieee80211vap *); 449void ieee80211_mesh_rt_flush_peer(struct ieee80211vap *, 450 const uint8_t [IEEE80211_ADDR_LEN]); 451void ieee80211_mesh_proxy_check(struct ieee80211vap *, 452 const uint8_t [IEEE80211_ADDR_LEN]); 453 454int ieee80211_mesh_register_proto_path(const 455 struct ieee80211_mesh_proto_path *); 456int ieee80211_mesh_register_proto_metric(const 457 struct ieee80211_mesh_proto_metric *); 458 459uint8_t * ieee80211_add_meshid(uint8_t *, struct ieee80211vap *); 460uint8_t * ieee80211_add_meshconf(uint8_t *, struct ieee80211vap *); 461uint8_t * ieee80211_add_meshpeer(uint8_t *, uint8_t, uint16_t, uint16_t, 462 uint16_t); 463uint8_t * ieee80211_add_meshlmetric(uint8_t *, uint32_t); 464 465void ieee80211_mesh_node_init(struct ieee80211vap *, 466 struct ieee80211_node *); 467void ieee80211_mesh_node_cleanup(struct ieee80211_node *); 468void ieee80211_parse_meshid(struct ieee80211_node *, 469 const uint8_t *); 470struct ieee80211_scanparams; 471void ieee80211_mesh_init_neighbor(struct ieee80211_node *, 472 const struct ieee80211_frame *, 473 const struct ieee80211_scanparams *); 474void ieee80211_mesh_update_beacon(struct ieee80211vap *, 475 struct ieee80211_beacon_offsets *); 476 477/* 478 * Return non-zero if proxy operation is enabled. 479 */ 480static __inline int 481ieee80211_mesh_isproxyena(struct ieee80211vap *vap) 482{ 483 struct ieee80211_mesh_state *ms = vap->iv_mesh; 484 return (ms->ms_flags & 485 (IEEE80211_MESHFLAGS_AP | IEEE80211_MESHFLAGS_PORTAL)) != 0; 486} 487 488/* 489 * Process an outbound frame: if a path is known to the 490 * destination then return a reference to the next hop 491 * for immediate transmission. Otherwise initiate path 492 * discovery and, if possible queue the packet to be 493 * sent when path discovery completes. 494 */ 495static __inline struct ieee80211_node * 496ieee80211_mesh_discover(struct ieee80211vap *vap, 497 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m) 498{ 499 struct ieee80211_mesh_state *ms = vap->iv_mesh; 500 return ms->ms_ppath->mpp_discover(vap, dest, m); 501} 502 503#endif /* _KERNEL */ 504#endif /* !_NET80211_IEEE80211_MESH_H_ */ 505