1 /* 2 * Copyright (c) 2008, 2009 open80211s Ltd. 3 * Author: Luis Carlos Cobo <luisca@cozybit.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/etherdevice.h> 12 #include <asm/unaligned.h> 13 #include "wme.h" 14 #include "mesh.h" 15 16 #define TEST_FRAME_LEN 8192 17 #define MAX_METRIC 0xffffffff 18 #define ARITH_SHIFT 8 19 20 #define MAX_PREQ_QUEUE_LEN 64 21 22 /* Destination only */ 23 #define MP_F_DO 0x1 24 /* Reply and forward */ 25 #define MP_F_RF 0x2 26 /* Unknown Sequence Number */ 27 #define MP_F_USN 0x01 28 /* Reason code Present */ 29 #define MP_F_RCODE 0x02 30 31 static void mesh_queue_preq(struct mesh_path *, u8); 32 33 static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) 34 { 35 if (ae) 36 offset += 6; 37 return get_unaligned_le32(preq_elem + offset); 38 } 39 40 static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) 41 { 42 if (ae) 43 offset += 6; 44 return get_unaligned_le16(preq_elem + offset); 45 } 46 47 /* HWMP IE processing macros */ 48 #define AE_F (1<<6) 49 #define AE_F_SET(x) (*x & AE_F) 50 #define PREQ_IE_FLAGS(x) (*(x)) 51 #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) 52 #define PREQ_IE_TTL(x) (*(x + 2)) 53 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) 54 #define PREQ_IE_ORIG_ADDR(x) (x + 7) 55 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) 56 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) 57 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) 58 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) 59 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) 60 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) 61 62 63 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) 64 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) 65 #define PREP_IE_TTL(x) PREQ_IE_TTL(x) 66 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) 67 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) 68 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) 69 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) 70 #define PREP_IE_TARGET_ADDR(x) (x + 3) 71 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) 72 73 #define PERR_IE_TTL(x) (*(x)) 74 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) 75 #define PERR_IE_TARGET_ADDR(x) (x + 3) 76 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) 77 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) 78 79 #define MSEC_TO_TU(x) (x*1000/1024) 80 #define SN_GT(x, y) ((s32)(y - x) < 0) 81 #define SN_LT(x, y) ((s32)(x - y) < 0) 82 83 #define net_traversal_jiffies(s) \ 84 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) 85 #define default_lifetime(s) \ 86 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) 87 #define min_preq_int_jiff(s) \ 88 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) 89 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) 90 #define disc_timeout_jiff(s) \ 91 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) 92 #define root_path_confirmation_jiffies(s) \ 93 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) 94 95 enum mpath_frame_type { 96 MPATH_PREQ = 0, 97 MPATH_PREP, 98 MPATH_PERR, 99 MPATH_RANN 100 }; 101 102 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 103 104 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, 105 const u8 *orig_addr, u32 orig_sn, 106 u8 target_flags, const u8 *target, 107 u32 target_sn, const u8 *da, 108 u8 hop_count, u8 ttl, 109 u32 lifetime, u32 metric, u32 preq_id, 110 struct ieee80211_sub_if_data *sdata) 111 { 112 struct ieee80211_local *local = sdata->local; 113 struct sk_buff *skb; 114 struct ieee80211_mgmt *mgmt; 115 u8 *pos, ie_len; 116 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + 117 sizeof(mgmt->u.action.u.mesh_action); 118 119 skb = dev_alloc_skb(local->tx_headroom + 120 hdr_len + 121 2 + 37); /* max HWMP IE */ 122 if (!skb) 123 return -1; 124 skb_reserve(skb, local->tx_headroom); 125 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 126 memset(mgmt, 0, hdr_len); 127 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 128 IEEE80211_STYPE_ACTION); 129 130 memcpy(mgmt->da, da, ETH_ALEN); 131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 132 /* BSSID == SA */ 133 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 134 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; 135 mgmt->u.action.u.mesh_action.action_code = 136 WLAN_MESH_ACTION_HWMP_PATH_SELECTION; 137 138 switch (action) { 139 case MPATH_PREQ: 140 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); 141 ie_len = 37; 142 pos = skb_put(skb, 2 + ie_len); 143 *pos++ = WLAN_EID_PREQ; 144 break; 145 case MPATH_PREP: 146 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); 147 ie_len = 31; 148 pos = skb_put(skb, 2 + ie_len); 149 *pos++ = WLAN_EID_PREP; 150 break; 151 case MPATH_RANN: 152 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); 153 ie_len = sizeof(struct ieee80211_rann_ie); 154 pos = skb_put(skb, 2 + ie_len); 155 *pos++ = WLAN_EID_RANN; 156 break; 157 default: 158 kfree_skb(skb); 159 return -ENOTSUPP; 160 break; 161 } 162 *pos++ = ie_len; 163 *pos++ = flags; 164 *pos++ = hop_count; 165 *pos++ = ttl; 166 if (action == MPATH_PREP) { 167 memcpy(pos, target, ETH_ALEN); 168 pos += ETH_ALEN; 169 put_unaligned_le32(target_sn, pos); 170 pos += 4; 171 } else { 172 if (action == MPATH_PREQ) { 173 put_unaligned_le32(preq_id, pos); 174 pos += 4; 175 } 176 memcpy(pos, orig_addr, ETH_ALEN); 177 pos += ETH_ALEN; 178 put_unaligned_le32(orig_sn, pos); 179 pos += 4; 180 } 181 put_unaligned_le32(lifetime, pos); /* interval for RANN */ 182 pos += 4; 183 put_unaligned_le32(metric, pos); 184 pos += 4; 185 if (action == MPATH_PREQ) { 186 *pos++ = 1; /* destination count */ 187 *pos++ = target_flags; 188 memcpy(pos, target, ETH_ALEN); 189 pos += ETH_ALEN; 190 put_unaligned_le32(target_sn, pos); 191 pos += 4; 192 } else if (action == MPATH_PREP) { 193 memcpy(pos, orig_addr, ETH_ALEN); 194 pos += ETH_ALEN; 195 put_unaligned_le32(orig_sn, pos); 196 pos += 4; 197 } 198 199 ieee80211_tx_skb(sdata, skb); 200 return 0; 201 } 202 203 204 /* Headroom is not adjusted. Caller should ensure that skb has sufficient 205 * headroom in case the frame is encrypted. */ 206 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, 207 struct sk_buff *skb) 208 { 209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 210 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 211 212 skb_set_mac_header(skb, 0); 213 skb_set_network_header(skb, 0); 214 skb_set_transport_header(skb, 0); 215 216 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ 217 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 218 skb->priority = 7; 219 220 info->control.vif = &sdata->vif; 221 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 222 ieee80211_set_qos_hdr(sdata, skb); 223 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 224 } 225 226 /** 227 * mesh_path_error_tx - Sends a PERR mesh management frame 228 * 229 * @ttl: allowed remaining hops 230 * @target: broken destination 231 * @target_sn: SN of the broken destination 232 * @target_rcode: reason code for this PERR 233 * @ra: node this frame is addressed to 234 * @sdata: local mesh subif 235 * 236 * Note: This function may be called with driver locks taken that the driver 237 * also acquires in the TX path. To avoid a deadlock we don't transmit the 238 * frame directly but add it to the pending queue instead. 239 */ 240 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 241 u8 ttl, const u8 *target, u32 target_sn, 242 u16 target_rcode, const u8 *ra) 243 { 244 struct ieee80211_local *local = sdata->local; 245 struct sk_buff *skb; 246 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 247 struct ieee80211_mgmt *mgmt; 248 u8 *pos, ie_len; 249 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + 250 sizeof(mgmt->u.action.u.mesh_action); 251 252 if (time_before(jiffies, ifmsh->next_perr)) 253 return -EAGAIN; 254 255 skb = dev_alloc_skb(local->tx_headroom + 256 sdata->encrypt_headroom + 257 IEEE80211_ENCRYPT_TAILROOM + 258 hdr_len + 259 2 + 15 /* PERR IE */); 260 if (!skb) 261 return -1; 262 skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); 263 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 264 memset(mgmt, 0, hdr_len); 265 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 266 IEEE80211_STYPE_ACTION); 267 268 memcpy(mgmt->da, ra, ETH_ALEN); 269 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 270 /* BSSID == SA */ 271 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 272 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; 273 mgmt->u.action.u.mesh_action.action_code = 274 WLAN_MESH_ACTION_HWMP_PATH_SELECTION; 275 ie_len = 15; 276 pos = skb_put(skb, 2 + ie_len); 277 *pos++ = WLAN_EID_PERR; 278 *pos++ = ie_len; 279 /* ttl */ 280 *pos++ = ttl; 281 /* number of destinations */ 282 *pos++ = 1; 283 /* 284 * flags bit, bit 1 is unset if we know the sequence number and 285 * bit 2 is set if we have a reason code 286 */ 287 *pos = 0; 288 if (!target_sn) 289 *pos |= MP_F_USN; 290 if (target_rcode) 291 *pos |= MP_F_RCODE; 292 pos++; 293 memcpy(pos, target, ETH_ALEN); 294 pos += ETH_ALEN; 295 put_unaligned_le32(target_sn, pos); 296 pos += 4; 297 put_unaligned_le16(target_rcode, pos); 298 299 /* see note in function header */ 300 prepare_frame_for_deferred_tx(sdata, skb); 301 ifmsh->next_perr = TU_TO_EXP_TIME( 302 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); 303 ieee80211_add_pending_skb(local, skb); 304 return 0; 305 } 306 307 void ieee80211s_update_metric(struct ieee80211_local *local, 308 struct sta_info *sta, struct sk_buff *skb) 309 { 310 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); 311 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 312 int failed; 313 314 if (!ieee80211_is_data(hdr->frame_control)) 315 return; 316 317 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); 318 319 /* moving average, scaled to 100 */ 320 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); 321 if (sta->fail_avg > 95) 322 mesh_plink_broken(sta); 323 } 324 325 static u32 airtime_link_metric_get(struct ieee80211_local *local, 326 struct sta_info *sta) 327 { 328 struct rate_info rinfo; 329 /* This should be adjusted for each device */ 330 int device_constant = 1 << ARITH_SHIFT; 331 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; 332 int s_unit = 1 << ARITH_SHIFT; 333 int rate, err; 334 u32 tx_time, estimated_retx; 335 u64 result; 336 337 if (sta->fail_avg >= 100) 338 return MAX_METRIC; 339 340 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); 341 rate = cfg80211_calculate_bitrate(&rinfo); 342 if (WARN_ON(!rate)) 343 return MAX_METRIC; 344 345 err = (sta->fail_avg << ARITH_SHIFT) / 100; 346 347 /* bitrate is in units of 100 Kbps, while we need rate in units of 348 * 1Mbps. This will be corrected on tx_time computation. 349 */ 350 tx_time = (device_constant + 10 * test_frame_len / rate); 351 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); 352 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; 353 return (u32)result; 354 } 355 356 /** 357 * hwmp_route_info_get - Update routing info to originator and transmitter 358 * 359 * @sdata: local mesh subif 360 * @mgmt: mesh management frame 361 * @hwmp_ie: hwmp information element (PREP or PREQ) 362 * @action: type of hwmp ie 363 * 364 * This function updates the path routing information to the originator and the 365 * transmitter of a HWMP PREQ or PREP frame. 366 * 367 * Returns: metric to frame originator or 0 if the frame should not be further 368 * processed 369 * 370 * Notes: this function is the only place (besides user-provided info) where 371 * path routing information is updated. 372 */ 373 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, 374 struct ieee80211_mgmt *mgmt, 375 const u8 *hwmp_ie, enum mpath_frame_type action) 376 { 377 struct ieee80211_local *local = sdata->local; 378 struct mesh_path *mpath; 379 struct sta_info *sta; 380 bool fresh_info; 381 const u8 *orig_addr, *ta; 382 u32 orig_sn, orig_metric; 383 unsigned long orig_lifetime, exp_time; 384 u32 last_hop_metric, new_metric; 385 bool process = true; 386 387 rcu_read_lock(); 388 sta = sta_info_get(sdata, mgmt->sa); 389 if (!sta) { 390 rcu_read_unlock(); 391 return 0; 392 } 393 394 last_hop_metric = airtime_link_metric_get(local, sta); 395 /* Update and check originator routing info */ 396 fresh_info = true; 397 398 switch (action) { 399 case MPATH_PREQ: 400 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); 401 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); 402 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); 403 orig_metric = PREQ_IE_METRIC(hwmp_ie); 404 break; 405 case MPATH_PREP: 406 /* Originator here refers to the MP that was the target in the 407 * Path Request. We divert from the nomenclature in the draft 408 * so that we can easily use a single function to gather path 409 * information from both PREQ and PREP frames. 410 */ 411 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); 412 orig_sn = PREP_IE_TARGET_SN(hwmp_ie); 413 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); 414 orig_metric = PREP_IE_METRIC(hwmp_ie); 415 break; 416 default: 417 rcu_read_unlock(); 418 return 0; 419 } 420 new_metric = orig_metric + last_hop_metric; 421 if (new_metric < orig_metric) 422 new_metric = MAX_METRIC; 423 exp_time = TU_TO_EXP_TIME(orig_lifetime); 424 425 if (ether_addr_equal(orig_addr, sdata->vif.addr)) { 426 /* This MP is the originator, we are not interested in this 427 * frame, except for updating transmitter's path info. 428 */ 429 process = false; 430 fresh_info = false; 431 } else { 432 mpath = mesh_path_lookup(sdata, orig_addr); 433 if (mpath) { 434 spin_lock_bh(&mpath->state_lock); 435 if (mpath->flags & MESH_PATH_FIXED) 436 fresh_info = false; 437 else if ((mpath->flags & MESH_PATH_ACTIVE) && 438 (mpath->flags & MESH_PATH_SN_VALID)) { 439 if (SN_GT(mpath->sn, orig_sn) || 440 (mpath->sn == orig_sn && 441 new_metric >= mpath->metric)) { 442 process = false; 443 fresh_info = false; 444 } 445 } 446 } else { 447 mpath = mesh_path_add(sdata, orig_addr); 448 if (IS_ERR(mpath)) { 449 rcu_read_unlock(); 450 return 0; 451 } 452 spin_lock_bh(&mpath->state_lock); 453 } 454 455 if (fresh_info) { 456 mesh_path_assign_nexthop(mpath, sta); 457 mpath->flags |= MESH_PATH_SN_VALID; 458 mpath->metric = new_metric; 459 mpath->sn = orig_sn; 460 mpath->exp_time = time_after(mpath->exp_time, exp_time) 461 ? mpath->exp_time : exp_time; 462 mesh_path_activate(mpath); 463 spin_unlock_bh(&mpath->state_lock); 464 mesh_path_tx_pending(mpath); 465 /* draft says preq_id should be saved to, but there does 466 * not seem to be any use for it, skipping by now 467 */ 468 } else 469 spin_unlock_bh(&mpath->state_lock); 470 } 471 472 /* Update and check transmitter routing info */ 473 ta = mgmt->sa; 474 if (ether_addr_equal(orig_addr, ta)) 475 fresh_info = false; 476 else { 477 fresh_info = true; 478 479 mpath = mesh_path_lookup(sdata, ta); 480 if (mpath) { 481 spin_lock_bh(&mpath->state_lock); 482 if ((mpath->flags & MESH_PATH_FIXED) || 483 ((mpath->flags & MESH_PATH_ACTIVE) && 484 (last_hop_metric > mpath->metric))) 485 fresh_info = false; 486 } else { 487 mpath = mesh_path_add(sdata, ta); 488 if (IS_ERR(mpath)) { 489 rcu_read_unlock(); 490 return 0; 491 } 492 spin_lock_bh(&mpath->state_lock); 493 } 494 495 if (fresh_info) { 496 mesh_path_assign_nexthop(mpath, sta); 497 mpath->metric = last_hop_metric; 498 mpath->exp_time = time_after(mpath->exp_time, exp_time) 499 ? mpath->exp_time : exp_time; 500 mesh_path_activate(mpath); 501 spin_unlock_bh(&mpath->state_lock); 502 mesh_path_tx_pending(mpath); 503 } else 504 spin_unlock_bh(&mpath->state_lock); 505 } 506 507 rcu_read_unlock(); 508 509 return process ? new_metric : 0; 510 } 511 512 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, 513 struct ieee80211_mgmt *mgmt, 514 const u8 *preq_elem, u32 metric) 515 { 516 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 517 struct mesh_path *mpath = NULL; 518 const u8 *target_addr, *orig_addr; 519 const u8 *da; 520 u8 target_flags, ttl, flags; 521 u32 orig_sn, target_sn, lifetime, orig_metric; 522 bool reply = false; 523 bool forward = true; 524 bool root_is_gate; 525 526 /* Update target SN, if present */ 527 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 528 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); 529 target_sn = PREQ_IE_TARGET_SN(preq_elem); 530 orig_sn = PREQ_IE_ORIG_SN(preq_elem); 531 target_flags = PREQ_IE_TARGET_F(preq_elem); 532 orig_metric = metric; 533 /* Proactive PREQ gate announcements */ 534 flags = PREQ_IE_FLAGS(preq_elem); 535 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 536 537 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); 538 539 if (ether_addr_equal(target_addr, sdata->vif.addr)) { 540 mhwmp_dbg(sdata, "PREQ is for us\n"); 541 forward = false; 542 reply = true; 543 metric = 0; 544 if (time_after(jiffies, ifmsh->last_sn_update + 545 net_traversal_jiffies(sdata)) || 546 time_before(jiffies, ifmsh->last_sn_update)) { 547 ++ifmsh->sn; 548 ifmsh->last_sn_update = jiffies; 549 } 550 target_sn = ifmsh->sn; 551 } else if (is_broadcast_ether_addr(target_addr) && 552 (target_flags & IEEE80211_PREQ_TO_FLAG)) { 553 rcu_read_lock(); 554 mpath = mesh_path_lookup(sdata, orig_addr); 555 if (mpath) { 556 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 557 reply = true; 558 target_addr = sdata->vif.addr; 559 target_sn = ++ifmsh->sn; 560 metric = 0; 561 ifmsh->last_sn_update = jiffies; 562 } 563 if (root_is_gate) 564 mesh_path_add_gate(mpath); 565 } 566 rcu_read_unlock(); 567 } else { 568 rcu_read_lock(); 569 mpath = mesh_path_lookup(sdata, target_addr); 570 if (mpath) { 571 if ((!(mpath->flags & MESH_PATH_SN_VALID)) || 572 SN_LT(mpath->sn, target_sn)) { 573 mpath->sn = target_sn; 574 mpath->flags |= MESH_PATH_SN_VALID; 575 } else if ((!(target_flags & MP_F_DO)) && 576 (mpath->flags & MESH_PATH_ACTIVE)) { 577 reply = true; 578 metric = mpath->metric; 579 target_sn = mpath->sn; 580 if (target_flags & MP_F_RF) 581 target_flags |= MP_F_DO; 582 else 583 forward = false; 584 } 585 } 586 rcu_read_unlock(); 587 } 588 589 if (reply) { 590 lifetime = PREQ_IE_LIFETIME(preq_elem); 591 ttl = ifmsh->mshcfg.element_ttl; 592 if (ttl != 0) { 593 mhwmp_dbg(sdata, "replying to the PREQ\n"); 594 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, 595 orig_sn, 0, target_addr, 596 target_sn, mgmt->sa, 0, ttl, 597 lifetime, metric, 0, sdata); 598 } else { 599 ifmsh->mshstats.dropped_frames_ttl++; 600 } 601 } 602 603 if (forward && ifmsh->mshcfg.dot11MeshForwarding) { 604 u32 preq_id; 605 u8 hopcount; 606 607 ttl = PREQ_IE_TTL(preq_elem); 608 lifetime = PREQ_IE_LIFETIME(preq_elem); 609 if (ttl <= 1) { 610 ifmsh->mshstats.dropped_frames_ttl++; 611 return; 612 } 613 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); 614 --ttl; 615 preq_id = PREQ_IE_PREQ_ID(preq_elem); 616 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; 617 da = (mpath && mpath->is_root) ? 618 mpath->rann_snd_addr : broadcast_addr; 619 620 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 621 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 622 target_sn = PREQ_IE_TARGET_SN(preq_elem); 623 metric = orig_metric; 624 } 625 626 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, 627 orig_sn, target_flags, target_addr, 628 target_sn, da, hopcount, ttl, lifetime, 629 metric, preq_id, sdata); 630 if (!is_multicast_ether_addr(da)) 631 ifmsh->mshstats.fwded_unicast++; 632 else 633 ifmsh->mshstats.fwded_mcast++; 634 ifmsh->mshstats.fwded_frames++; 635 } 636 } 637 638 639 static inline struct sta_info * 640 next_hop_deref_protected(struct mesh_path *mpath) 641 { 642 return rcu_dereference_protected(mpath->next_hop, 643 lockdep_is_held(&mpath->state_lock)); 644 } 645 646 647 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, 648 struct ieee80211_mgmt *mgmt, 649 const u8 *prep_elem, u32 metric) 650 { 651 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 652 struct mesh_path *mpath; 653 const u8 *target_addr, *orig_addr; 654 u8 ttl, hopcount, flags; 655 u8 next_hop[ETH_ALEN]; 656 u32 target_sn, orig_sn, lifetime; 657 658 mhwmp_dbg(sdata, "received PREP from %pM\n", 659 PREP_IE_TARGET_ADDR(prep_elem)); 660 661 orig_addr = PREP_IE_ORIG_ADDR(prep_elem); 662 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 663 /* destination, no forwarding required */ 664 return; 665 666 if (!ifmsh->mshcfg.dot11MeshForwarding) 667 return; 668 669 ttl = PREP_IE_TTL(prep_elem); 670 if (ttl <= 1) { 671 sdata->u.mesh.mshstats.dropped_frames_ttl++; 672 return; 673 } 674 675 rcu_read_lock(); 676 mpath = mesh_path_lookup(sdata, orig_addr); 677 if (mpath) 678 spin_lock_bh(&mpath->state_lock); 679 else 680 goto fail; 681 if (!(mpath->flags & MESH_PATH_ACTIVE)) { 682 spin_unlock_bh(&mpath->state_lock); 683 goto fail; 684 } 685 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); 686 spin_unlock_bh(&mpath->state_lock); 687 --ttl; 688 flags = PREP_IE_FLAGS(prep_elem); 689 lifetime = PREP_IE_LIFETIME(prep_elem); 690 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; 691 target_addr = PREP_IE_TARGET_ADDR(prep_elem); 692 target_sn = PREP_IE_TARGET_SN(prep_elem); 693 orig_sn = PREP_IE_ORIG_SN(prep_elem); 694 695 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, 696 target_addr, target_sn, next_hop, hopcount, 697 ttl, lifetime, metric, 0, sdata); 698 rcu_read_unlock(); 699 700 sdata->u.mesh.mshstats.fwded_unicast++; 701 sdata->u.mesh.mshstats.fwded_frames++; 702 return; 703 704 fail: 705 rcu_read_unlock(); 706 sdata->u.mesh.mshstats.dropped_frames_no_route++; 707 } 708 709 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, 710 struct ieee80211_mgmt *mgmt, 711 const u8 *perr_elem) 712 { 713 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 714 struct mesh_path *mpath; 715 u8 ttl; 716 const u8 *ta, *target_addr; 717 u32 target_sn; 718 u16 target_rcode; 719 720 ta = mgmt->sa; 721 ttl = PERR_IE_TTL(perr_elem); 722 if (ttl <= 1) { 723 ifmsh->mshstats.dropped_frames_ttl++; 724 return; 725 } 726 ttl--; 727 target_addr = PERR_IE_TARGET_ADDR(perr_elem); 728 target_sn = PERR_IE_TARGET_SN(perr_elem); 729 target_rcode = PERR_IE_TARGET_RCODE(perr_elem); 730 731 rcu_read_lock(); 732 mpath = mesh_path_lookup(sdata, target_addr); 733 if (mpath) { 734 struct sta_info *sta; 735 736 spin_lock_bh(&mpath->state_lock); 737 sta = next_hop_deref_protected(mpath); 738 if (mpath->flags & MESH_PATH_ACTIVE && 739 ether_addr_equal(ta, sta->sta.addr) && 740 (!(mpath->flags & MESH_PATH_SN_VALID) || 741 SN_GT(target_sn, mpath->sn))) { 742 mpath->flags &= ~MESH_PATH_ACTIVE; 743 mpath->sn = target_sn; 744 spin_unlock_bh(&mpath->state_lock); 745 if (!ifmsh->mshcfg.dot11MeshForwarding) 746 goto endperr; 747 mesh_path_error_tx(sdata, ttl, target_addr, 748 target_sn, target_rcode, 749 broadcast_addr); 750 } else 751 spin_unlock_bh(&mpath->state_lock); 752 } 753 endperr: 754 rcu_read_unlock(); 755 } 756 757 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, 758 struct ieee80211_mgmt *mgmt, 759 const struct ieee80211_rann_ie *rann) 760 { 761 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 762 struct ieee80211_local *local = sdata->local; 763 struct sta_info *sta; 764 struct mesh_path *mpath; 765 u8 ttl, flags, hopcount; 766 const u8 *orig_addr; 767 u32 orig_sn, metric, metric_txsta, interval; 768 bool root_is_gate; 769 770 ttl = rann->rann_ttl; 771 flags = rann->rann_flags; 772 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 773 orig_addr = rann->rann_addr; 774 orig_sn = le32_to_cpu(rann->rann_seq); 775 interval = le32_to_cpu(rann->rann_interval); 776 hopcount = rann->rann_hopcount; 777 hopcount++; 778 metric = le32_to_cpu(rann->rann_metric); 779 780 /* Ignore our own RANNs */ 781 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 782 return; 783 784 mhwmp_dbg(sdata, 785 "received RANN from %pM via neighbour %pM (is_gate=%d)\n", 786 orig_addr, mgmt->sa, root_is_gate); 787 788 rcu_read_lock(); 789 sta = sta_info_get(sdata, mgmt->sa); 790 if (!sta) { 791 rcu_read_unlock(); 792 return; 793 } 794 795 metric_txsta = airtime_link_metric_get(local, sta); 796 797 mpath = mesh_path_lookup(sdata, orig_addr); 798 if (!mpath) { 799 mpath = mesh_path_add(sdata, orig_addr); 800 if (IS_ERR(mpath)) { 801 rcu_read_unlock(); 802 sdata->u.mesh.mshstats.dropped_frames_no_route++; 803 return; 804 } 805 } 806 807 if (!(SN_LT(mpath->sn, orig_sn)) && 808 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { 809 rcu_read_unlock(); 810 return; 811 } 812 813 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || 814 (time_after(jiffies, mpath->last_preq_to_root + 815 root_path_confirmation_jiffies(sdata)) || 816 time_before(jiffies, mpath->last_preq_to_root))) && 817 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { 818 mhwmp_dbg(sdata, 819 "time to refresh root mpath %pM\n", 820 orig_addr); 821 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); 822 mpath->last_preq_to_root = jiffies; 823 } 824 825 mpath->sn = orig_sn; 826 mpath->rann_metric = metric + metric_txsta; 827 mpath->is_root = true; 828 /* Recording RANNs sender address to send individually 829 * addressed PREQs destined for root mesh STA */ 830 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); 831 832 if (root_is_gate) 833 mesh_path_add_gate(mpath); 834 835 if (ttl <= 1) { 836 ifmsh->mshstats.dropped_frames_ttl++; 837 rcu_read_unlock(); 838 return; 839 } 840 ttl--; 841 842 if (ifmsh->mshcfg.dot11MeshForwarding) { 843 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, 844 orig_sn, 0, NULL, 0, broadcast_addr, 845 hopcount, ttl, interval, 846 metric + metric_txsta, 0, sdata); 847 } 848 849 rcu_read_unlock(); 850 } 851 852 853 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 854 struct ieee80211_mgmt *mgmt, size_t len) 855 { 856 struct ieee802_11_elems elems; 857 size_t baselen; 858 u32 last_hop_metric; 859 struct sta_info *sta; 860 861 /* need action_code */ 862 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 863 return; 864 865 rcu_read_lock(); 866 sta = sta_info_get(sdata, mgmt->sa); 867 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { 868 rcu_read_unlock(); 869 return; 870 } 871 rcu_read_unlock(); 872 873 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; 874 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, 875 len - baselen, false, &elems); 876 877 if (elems.preq) { 878 if (elems.preq_len != 37) 879 /* Right now we support just 1 destination and no AE */ 880 return; 881 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, 882 MPATH_PREQ); 883 if (last_hop_metric) 884 hwmp_preq_frame_process(sdata, mgmt, elems.preq, 885 last_hop_metric); 886 } 887 if (elems.prep) { 888 if (elems.prep_len != 31) 889 /* Right now we support no AE */ 890 return; 891 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, 892 MPATH_PREP); 893 if (last_hop_metric) 894 hwmp_prep_frame_process(sdata, mgmt, elems.prep, 895 last_hop_metric); 896 } 897 if (elems.perr) { 898 if (elems.perr_len != 15) 899 /* Right now we support only one destination per PERR */ 900 return; 901 hwmp_perr_frame_process(sdata, mgmt, elems.perr); 902 } 903 if (elems.rann) 904 hwmp_rann_frame_process(sdata, mgmt, elems.rann); 905 } 906 907 /** 908 * mesh_queue_preq - queue a PREQ to a given destination 909 * 910 * @mpath: mesh path to discover 911 * @flags: special attributes of the PREQ to be sent 912 * 913 * Locking: the function must be called from within a rcu read lock block. 914 * 915 */ 916 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) 917 { 918 struct ieee80211_sub_if_data *sdata = mpath->sdata; 919 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 920 struct mesh_preq_queue *preq_node; 921 922 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); 923 if (!preq_node) { 924 mhwmp_dbg(sdata, "could not allocate PREQ node\n"); 925 return; 926 } 927 928 spin_lock_bh(&ifmsh->mesh_preq_queue_lock); 929 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { 930 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 931 kfree(preq_node); 932 if (printk_ratelimit()) 933 mhwmp_dbg(sdata, "PREQ node queue full\n"); 934 return; 935 } 936 937 spin_lock(&mpath->state_lock); 938 if (mpath->flags & MESH_PATH_REQ_QUEUED) { 939 spin_unlock(&mpath->state_lock); 940 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 941 kfree(preq_node); 942 return; 943 } 944 945 memcpy(preq_node->dst, mpath->dst, ETH_ALEN); 946 preq_node->flags = flags; 947 948 mpath->flags |= MESH_PATH_REQ_QUEUED; 949 spin_unlock(&mpath->state_lock); 950 951 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); 952 ++ifmsh->preq_queue_len; 953 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 954 955 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) 956 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 957 958 else if (time_before(jiffies, ifmsh->last_preq)) { 959 /* avoid long wait if did not send preqs for a long time 960 * and jiffies wrapped around 961 */ 962 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; 963 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 964 } else 965 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + 966 min_preq_int_jiff(sdata)); 967 } 968 969 /** 970 * mesh_path_start_discovery - launch a path discovery from the PREQ queue 971 * 972 * @sdata: local mesh subif 973 */ 974 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) 975 { 976 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 977 struct mesh_preq_queue *preq_node; 978 struct mesh_path *mpath; 979 u8 ttl, target_flags; 980 const u8 *da; 981 u32 lifetime; 982 983 spin_lock_bh(&ifmsh->mesh_preq_queue_lock); 984 if (!ifmsh->preq_queue_len || 985 time_before(jiffies, ifmsh->last_preq + 986 min_preq_int_jiff(sdata))) { 987 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 988 return; 989 } 990 991 preq_node = list_first_entry(&ifmsh->preq_queue.list, 992 struct mesh_preq_queue, list); 993 list_del(&preq_node->list); 994 --ifmsh->preq_queue_len; 995 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 996 997 rcu_read_lock(); 998 mpath = mesh_path_lookup(sdata, preq_node->dst); 999 if (!mpath) 1000 goto enddiscovery; 1001 1002 spin_lock_bh(&mpath->state_lock); 1003 mpath->flags &= ~MESH_PATH_REQ_QUEUED; 1004 if (preq_node->flags & PREQ_Q_F_START) { 1005 if (mpath->flags & MESH_PATH_RESOLVING) { 1006 spin_unlock_bh(&mpath->state_lock); 1007 goto enddiscovery; 1008 } else { 1009 mpath->flags &= ~MESH_PATH_RESOLVED; 1010 mpath->flags |= MESH_PATH_RESOLVING; 1011 mpath->discovery_retries = 0; 1012 mpath->discovery_timeout = disc_timeout_jiff(sdata); 1013 } 1014 } else if (!(mpath->flags & MESH_PATH_RESOLVING) || 1015 mpath->flags & MESH_PATH_RESOLVED) { 1016 mpath->flags &= ~MESH_PATH_RESOLVING; 1017 spin_unlock_bh(&mpath->state_lock); 1018 goto enddiscovery; 1019 } 1020 1021 ifmsh->last_preq = jiffies; 1022 1023 if (time_after(jiffies, ifmsh->last_sn_update + 1024 net_traversal_jiffies(sdata)) || 1025 time_before(jiffies, ifmsh->last_sn_update)) { 1026 ++ifmsh->sn; 1027 sdata->u.mesh.last_sn_update = jiffies; 1028 } 1029 lifetime = default_lifetime(sdata); 1030 ttl = sdata->u.mesh.mshcfg.element_ttl; 1031 if (ttl == 0) { 1032 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1033 spin_unlock_bh(&mpath->state_lock); 1034 goto enddiscovery; 1035 } 1036 1037 if (preq_node->flags & PREQ_Q_F_REFRESH) 1038 target_flags = MP_F_DO; 1039 else 1040 target_flags = MP_F_RF; 1041 1042 spin_unlock_bh(&mpath->state_lock); 1043 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; 1044 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, 1045 target_flags, mpath->dst, mpath->sn, da, 0, 1046 ttl, lifetime, 0, ifmsh->preq_id++, sdata); 1047 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); 1048 1049 enddiscovery: 1050 rcu_read_unlock(); 1051 kfree(preq_node); 1052 } 1053 1054 /** 1055 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery 1056 * 1057 * @skb: 802.11 frame to be sent 1058 * @sdata: network subif the frame will be sent through 1059 * 1060 * Lookup next hop for given skb and start path discovery if no 1061 * forwarding information is found. 1062 * 1063 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. 1064 * skb is freeed here if no mpath could be allocated. 1065 */ 1066 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, 1067 struct sk_buff *skb) 1068 { 1069 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1070 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1071 struct mesh_path *mpath; 1072 struct sk_buff *skb_to_free = NULL; 1073 u8 *target_addr = hdr->addr3; 1074 int err = 0; 1075 1076 /* Nulls are only sent to peers for PS and should be pre-addressed */ 1077 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 1078 return 0; 1079 1080 rcu_read_lock(); 1081 err = mesh_nexthop_lookup(sdata, skb); 1082 if (!err) 1083 goto endlookup; 1084 1085 /* no nexthop found, start resolving */ 1086 mpath = mesh_path_lookup(sdata, target_addr); 1087 if (!mpath) { 1088 mpath = mesh_path_add(sdata, target_addr); 1089 if (IS_ERR(mpath)) { 1090 mesh_path_discard_frame(sdata, skb); 1091 err = PTR_ERR(mpath); 1092 goto endlookup; 1093 } 1094 } 1095 1096 if (!(mpath->flags & MESH_PATH_RESOLVING)) 1097 mesh_queue_preq(mpath, PREQ_Q_F_START); 1098 1099 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) 1100 skb_to_free = skb_dequeue(&mpath->frame_queue); 1101 1102 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1103 ieee80211_set_qos_hdr(sdata, skb); 1104 skb_queue_tail(&mpath->frame_queue, skb); 1105 err = -ENOENT; 1106 if (skb_to_free) 1107 mesh_path_discard_frame(sdata, skb_to_free); 1108 1109 endlookup: 1110 rcu_read_unlock(); 1111 return err; 1112 } 1113 1114 /** 1115 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling 1116 * this function is considered "using" the associated mpath, so preempt a path 1117 * refresh if this mpath expires soon. 1118 * 1119 * @skb: 802.11 frame to be sent 1120 * @sdata: network subif the frame will be sent through 1121 * 1122 * Returns: 0 if the next hop was found. Nonzero otherwise. 1123 */ 1124 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, 1125 struct sk_buff *skb) 1126 { 1127 struct mesh_path *mpath; 1128 struct sta_info *next_hop; 1129 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1130 u8 *target_addr = hdr->addr3; 1131 int err = -ENOENT; 1132 1133 rcu_read_lock(); 1134 mpath = mesh_path_lookup(sdata, target_addr); 1135 1136 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) 1137 goto endlookup; 1138 1139 if (time_after(jiffies, 1140 mpath->exp_time - 1141 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && 1142 ether_addr_equal(sdata->vif.addr, hdr->addr4) && 1143 !(mpath->flags & MESH_PATH_RESOLVING) && 1144 !(mpath->flags & MESH_PATH_FIXED)) 1145 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); 1146 1147 next_hop = rcu_dereference(mpath->next_hop); 1148 if (next_hop) { 1149 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); 1150 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 1151 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); 1152 err = 0; 1153 } 1154 1155 endlookup: 1156 rcu_read_unlock(); 1157 return err; 1158 } 1159 1160 void mesh_path_timer(unsigned long data) 1161 { 1162 struct mesh_path *mpath = (void *) data; 1163 struct ieee80211_sub_if_data *sdata = mpath->sdata; 1164 int ret; 1165 1166 if (sdata->local->quiescing) 1167 return; 1168 1169 spin_lock_bh(&mpath->state_lock); 1170 if (mpath->flags & MESH_PATH_RESOLVED || 1171 (!(mpath->flags & MESH_PATH_RESOLVING))) { 1172 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); 1173 spin_unlock_bh(&mpath->state_lock); 1174 } else if (mpath->discovery_retries < max_preq_retries(sdata)) { 1175 ++mpath->discovery_retries; 1176 mpath->discovery_timeout *= 2; 1177 mpath->flags &= ~MESH_PATH_REQ_QUEUED; 1178 spin_unlock_bh(&mpath->state_lock); 1179 mesh_queue_preq(mpath, 0); 1180 } else { 1181 mpath->flags = 0; 1182 mpath->exp_time = jiffies; 1183 spin_unlock_bh(&mpath->state_lock); 1184 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { 1185 ret = mesh_path_send_to_gates(mpath); 1186 if (ret) 1187 mhwmp_dbg(sdata, "no gate was reachable\n"); 1188 } else 1189 mesh_path_flush_pending(mpath); 1190 } 1191 } 1192 1193 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) 1194 { 1195 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1196 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 1197 u8 flags, target_flags = 0; 1198 1199 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) 1200 ? RANN_FLAG_IS_GATE : 0; 1201 1202 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { 1203 case IEEE80211_PROACTIVE_RANN: 1204 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, 1205 ++ifmsh->sn, 0, NULL, 0, broadcast_addr, 1206 0, ifmsh->mshcfg.element_ttl, 1207 interval, 0, 0, sdata); 1208 break; 1209 case IEEE80211_PROACTIVE_PREQ_WITH_PREP: 1210 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; 1211 case IEEE80211_PROACTIVE_PREQ_NO_PREP: 1212 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; 1213 target_flags |= IEEE80211_PREQ_TO_FLAG | 1214 IEEE80211_PREQ_USN_FLAG; 1215 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, 1216 ++ifmsh->sn, target_flags, 1217 (u8 *) broadcast_addr, 0, broadcast_addr, 1218 0, ifmsh->mshcfg.element_ttl, interval, 1219 0, ifmsh->preq_id++, sdata); 1220 break; 1221 default: 1222 mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); 1223 return; 1224 } 1225 } 1226