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