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 /* Number of frames buffered per destination for unresolved destinations */ 21 #define MESH_FRAME_QUEUE_LEN 10 22 #define MAX_PREQ_QUEUE_LEN 64 23 24 /* Destination only */ 25 #define MP_F_DO 0x1 26 /* Reply and forward */ 27 #define MP_F_RF 0x2 28 /* Unknown Sequence Number */ 29 #define MP_F_USN 0x01 30 /* Reason code Present */ 31 #define MP_F_RCODE 0x02 32 33 static void mesh_queue_preq(struct mesh_path *, u8); 34 35 static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) 36 { 37 if (ae) 38 offset += 6; 39 return get_unaligned_le32(preq_elem + offset); 40 } 41 42 static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) 43 { 44 if (ae) 45 offset += 6; 46 return get_unaligned_le16(preq_elem + offset); 47 } 48 49 /* HWMP IE processing macros */ 50 #define AE_F (1<<6) 51 #define AE_F_SET(x) (*x & AE_F) 52 #define PREQ_IE_FLAGS(x) (*(x)) 53 #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) 54 #define PREQ_IE_TTL(x) (*(x + 2)) 55 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) 56 #define PREQ_IE_ORIG_ADDR(x) (x + 7) 57 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) 58 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) 59 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) 60 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) 61 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) 62 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) 63 64 65 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) 66 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) 67 #define PREP_IE_TTL(x) PREQ_IE_TTL(x) 68 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) 69 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) 70 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) 71 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) 72 #define PREP_IE_TARGET_ADDR(x) (x + 3) 73 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) 74 75 #define PERR_IE_TTL(x) (*(x)) 76 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) 77 #define PERR_IE_TARGET_ADDR(x) (x + 3) 78 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) 79 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) 80 81 #define MSEC_TO_TU(x) (x*1000/1024) 82 #define SN_GT(x, y) ((s32)(y - x) < 0) 83 #define SN_LT(x, y) ((s32)(x - y) < 0) 84 85 #define net_traversal_jiffies(s) \ 86 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) 87 #define default_lifetime(s) \ 88 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) 89 #define min_preq_int_jiff(s) \ 90 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) 91 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) 92 #define disc_timeout_jiff(s) \ 93 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) 94 #define root_path_confirmation_jiffies(s) \ 95 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) 96 97 enum mpath_frame_type { 98 MPATH_PREQ = 0, 99 MPATH_PREP, 100 MPATH_PERR, 101 MPATH_RANN 102 }; 103 104 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 105 106 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, 107 u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, 108 __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, 109 __le32 lifetime, __le32 metric, __le32 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", target); 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 memcpy(pos, &target_sn, 4); 170 pos += 4; 171 } else { 172 if (action == MPATH_PREQ) { 173 memcpy(pos, &preq_id, 4); 174 pos += 4; 175 } 176 memcpy(pos, orig_addr, ETH_ALEN); 177 pos += ETH_ALEN; 178 memcpy(pos, &orig_sn, 4); 179 pos += 4; 180 } 181 memcpy(pos, &lifetime, 4); /* interval for RANN */ 182 pos += 4; 183 memcpy(pos, &metric, 4); 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 memcpy(pos, &target_sn, 4); 191 pos += 4; 192 } else if (action == MPATH_PREP) { 193 memcpy(pos, orig_addr, ETH_ALEN); 194 pos += ETH_ALEN; 195 memcpy(pos, &orig_sn, 4); 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); 210 211 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 ieee80211_set_qos_hdr(sdata, skb); 221 } 222 223 /** 224 * mesh_send_path error - Sends a PERR mesh management frame 225 * 226 * @target: broken destination 227 * @target_sn: SN of the broken destination 228 * @target_rcode: reason code for this PERR 229 * @ra: node this frame is addressed to 230 * 231 * Note: This function may be called with driver locks taken that the driver 232 * also acquires in the TX path. To avoid a deadlock we don't transmit the 233 * frame directly but add it to the pending queue instead. 234 */ 235 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, 236 __le16 target_rcode, const u8 *ra, 237 struct ieee80211_sub_if_data *sdata) 238 { 239 struct ieee80211_local *local = sdata->local; 240 struct sk_buff *skb; 241 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 242 struct ieee80211_mgmt *mgmt; 243 u8 *pos, ie_len; 244 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + 245 sizeof(mgmt->u.action.u.mesh_action); 246 247 if (time_before(jiffies, ifmsh->next_perr)) 248 return -EAGAIN; 249 250 skb = dev_alloc_skb(local->tx_headroom + 251 hdr_len + 252 2 + 15 /* PERR IE */); 253 if (!skb) 254 return -1; 255 skb_reserve(skb, local->tx_headroom); 256 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 257 memset(mgmt, 0, hdr_len); 258 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 259 IEEE80211_STYPE_ACTION); 260 261 memcpy(mgmt->da, ra, ETH_ALEN); 262 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 263 /* BSSID == SA */ 264 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 265 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; 266 mgmt->u.action.u.mesh_action.action_code = 267 WLAN_MESH_ACTION_HWMP_PATH_SELECTION; 268 ie_len = 15; 269 pos = skb_put(skb, 2 + ie_len); 270 *pos++ = WLAN_EID_PERR; 271 *pos++ = ie_len; 272 /* ttl */ 273 *pos++ = ttl; 274 /* number of destinations */ 275 *pos++ = 1; 276 /* 277 * flags bit, bit 1 is unset if we know the sequence number and 278 * bit 2 is set if we have a reason code 279 */ 280 *pos = 0; 281 if (!target_sn) 282 *pos |= MP_F_USN; 283 if (target_rcode) 284 *pos |= MP_F_RCODE; 285 pos++; 286 memcpy(pos, target, ETH_ALEN); 287 pos += ETH_ALEN; 288 memcpy(pos, &target_sn, 4); 289 pos += 4; 290 memcpy(pos, &target_rcode, 2); 291 292 /* see note in function header */ 293 prepare_frame_for_deferred_tx(sdata, skb); 294 ifmsh->next_perr = TU_TO_EXP_TIME( 295 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); 296 ieee80211_add_pending_skb(local, skb); 297 return 0; 298 } 299 300 void ieee80211s_update_metric(struct ieee80211_local *local, 301 struct sta_info *sta, struct sk_buff *skb) 302 { 303 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); 304 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 305 int failed; 306 307 if (!ieee80211_is_data(hdr->frame_control)) 308 return; 309 310 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); 311 312 /* moving average, scaled to 100 */ 313 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); 314 if (sta->fail_avg > 95) 315 mesh_plink_broken(sta); 316 } 317 318 static u32 airtime_link_metric_get(struct ieee80211_local *local, 319 struct sta_info *sta) 320 { 321 struct rate_info rinfo; 322 /* This should be adjusted for each device */ 323 int device_constant = 1 << ARITH_SHIFT; 324 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; 325 int s_unit = 1 << ARITH_SHIFT; 326 int rate, err; 327 u32 tx_time, estimated_retx; 328 u64 result; 329 330 if (sta->fail_avg >= 100) 331 return MAX_METRIC; 332 333 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); 334 rate = cfg80211_calculate_bitrate(&rinfo); 335 if (WARN_ON(!rate)) 336 return MAX_METRIC; 337 338 err = (sta->fail_avg << ARITH_SHIFT) / 100; 339 340 /* bitrate is in units of 100 Kbps, while we need rate in units of 341 * 1Mbps. This will be corrected on tx_time computation. 342 */ 343 tx_time = (device_constant + 10 * test_frame_len / rate); 344 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); 345 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; 346 return (u32)result; 347 } 348 349 /** 350 * hwmp_route_info_get - Update routing info to originator and transmitter 351 * 352 * @sdata: local mesh subif 353 * @mgmt: mesh management frame 354 * @hwmp_ie: hwmp information element (PREP or PREQ) 355 * 356 * This function updates the path routing information to the originator and the 357 * transmitter of a HWMP PREQ or PREP frame. 358 * 359 * Returns: metric to frame originator or 0 if the frame should not be further 360 * processed 361 * 362 * Notes: this function is the only place (besides user-provided info) where 363 * path routing information is updated. 364 */ 365 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, 366 struct ieee80211_mgmt *mgmt, 367 u8 *hwmp_ie, enum mpath_frame_type action) 368 { 369 struct ieee80211_local *local = sdata->local; 370 struct mesh_path *mpath; 371 struct sta_info *sta; 372 bool fresh_info; 373 u8 *orig_addr, *ta; 374 u32 orig_sn, orig_metric; 375 unsigned long orig_lifetime, exp_time; 376 u32 last_hop_metric, new_metric; 377 bool process = true; 378 379 rcu_read_lock(); 380 sta = sta_info_get(sdata, mgmt->sa); 381 if (!sta) { 382 rcu_read_unlock(); 383 return 0; 384 } 385 386 last_hop_metric = airtime_link_metric_get(local, sta); 387 /* Update and check originator routing info */ 388 fresh_info = true; 389 390 switch (action) { 391 case MPATH_PREQ: 392 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); 393 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); 394 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); 395 orig_metric = PREQ_IE_METRIC(hwmp_ie); 396 break; 397 case MPATH_PREP: 398 /* Originator here refers to the MP that was the target in the 399 * Path Request. We divert from the nomenclature in the draft 400 * so that we can easily use a single function to gather path 401 * information from both PREQ and PREP frames. 402 */ 403 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); 404 orig_sn = PREP_IE_TARGET_SN(hwmp_ie); 405 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); 406 orig_metric = PREP_IE_METRIC(hwmp_ie); 407 break; 408 default: 409 rcu_read_unlock(); 410 return 0; 411 } 412 new_metric = orig_metric + last_hop_metric; 413 if (new_metric < orig_metric) 414 new_metric = MAX_METRIC; 415 exp_time = TU_TO_EXP_TIME(orig_lifetime); 416 417 if (ether_addr_equal(orig_addr, sdata->vif.addr)) { 418 /* This MP is the originator, we are not interested in this 419 * frame, except for updating transmitter's path info. 420 */ 421 process = false; 422 fresh_info = false; 423 } else { 424 mpath = mesh_path_lookup(orig_addr, sdata); 425 if (mpath) { 426 spin_lock_bh(&mpath->state_lock); 427 if (mpath->flags & MESH_PATH_FIXED) 428 fresh_info = false; 429 else if ((mpath->flags & MESH_PATH_ACTIVE) && 430 (mpath->flags & MESH_PATH_SN_VALID)) { 431 if (SN_GT(mpath->sn, orig_sn) || 432 (mpath->sn == orig_sn && 433 new_metric >= mpath->metric)) { 434 process = false; 435 fresh_info = false; 436 } 437 } 438 } else { 439 mesh_path_add(orig_addr, sdata); 440 mpath = mesh_path_lookup(orig_addr, sdata); 441 if (!mpath) { 442 rcu_read_unlock(); 443 return 0; 444 } 445 spin_lock_bh(&mpath->state_lock); 446 } 447 448 if (fresh_info) { 449 mesh_path_assign_nexthop(mpath, sta); 450 mpath->flags |= MESH_PATH_SN_VALID; 451 mpath->metric = new_metric; 452 mpath->sn = orig_sn; 453 mpath->exp_time = time_after(mpath->exp_time, exp_time) 454 ? mpath->exp_time : exp_time; 455 mesh_path_activate(mpath); 456 spin_unlock_bh(&mpath->state_lock); 457 mesh_path_tx_pending(mpath); 458 /* draft says preq_id should be saved to, but there does 459 * not seem to be any use for it, skipping by now 460 */ 461 } else 462 spin_unlock_bh(&mpath->state_lock); 463 } 464 465 /* Update and check transmitter routing info */ 466 ta = mgmt->sa; 467 if (ether_addr_equal(orig_addr, ta)) 468 fresh_info = false; 469 else { 470 fresh_info = true; 471 472 mpath = mesh_path_lookup(ta, sdata); 473 if (mpath) { 474 spin_lock_bh(&mpath->state_lock); 475 if ((mpath->flags & MESH_PATH_FIXED) || 476 ((mpath->flags & MESH_PATH_ACTIVE) && 477 (last_hop_metric > mpath->metric))) 478 fresh_info = false; 479 } else { 480 mesh_path_add(ta, sdata); 481 mpath = mesh_path_lookup(ta, sdata); 482 if (!mpath) { 483 rcu_read_unlock(); 484 return 0; 485 } 486 spin_lock_bh(&mpath->state_lock); 487 } 488 489 if (fresh_info) { 490 mesh_path_assign_nexthop(mpath, sta); 491 mpath->metric = last_hop_metric; 492 mpath->exp_time = time_after(mpath->exp_time, exp_time) 493 ? mpath->exp_time : exp_time; 494 mesh_path_activate(mpath); 495 spin_unlock_bh(&mpath->state_lock); 496 mesh_path_tx_pending(mpath); 497 } else 498 spin_unlock_bh(&mpath->state_lock); 499 } 500 501 rcu_read_unlock(); 502 503 return process ? new_metric : 0; 504 } 505 506 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, 507 struct ieee80211_mgmt *mgmt, 508 u8 *preq_elem, u32 metric) 509 { 510 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 511 struct mesh_path *mpath = NULL; 512 u8 *target_addr, *orig_addr; 513 const u8 *da; 514 u8 target_flags, ttl, flags; 515 u32 orig_sn, target_sn, lifetime, orig_metric; 516 bool reply = false; 517 bool forward = true; 518 bool root_is_gate; 519 520 /* Update target SN, if present */ 521 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 522 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); 523 target_sn = PREQ_IE_TARGET_SN(preq_elem); 524 orig_sn = PREQ_IE_ORIG_SN(preq_elem); 525 target_flags = PREQ_IE_TARGET_F(preq_elem); 526 orig_metric = metric; 527 /* Proactive PREQ gate announcements */ 528 flags = PREQ_IE_FLAGS(preq_elem); 529 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 530 531 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); 532 533 if (ether_addr_equal(target_addr, sdata->vif.addr)) { 534 mhwmp_dbg(sdata, "PREQ is for us\n"); 535 forward = false; 536 reply = true; 537 metric = 0; 538 if (time_after(jiffies, ifmsh->last_sn_update + 539 net_traversal_jiffies(sdata)) || 540 time_before(jiffies, ifmsh->last_sn_update)) { 541 target_sn = ++ifmsh->sn; 542 ifmsh->last_sn_update = jiffies; 543 } 544 } else if (is_broadcast_ether_addr(target_addr) && 545 (target_flags & IEEE80211_PREQ_TO_FLAG)) { 546 rcu_read_lock(); 547 mpath = mesh_path_lookup(orig_addr, sdata); 548 if (mpath) { 549 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 550 reply = true; 551 target_addr = sdata->vif.addr; 552 target_sn = ++ifmsh->sn; 553 metric = 0; 554 ifmsh->last_sn_update = jiffies; 555 } 556 if (root_is_gate) 557 mesh_path_add_gate(mpath); 558 } 559 rcu_read_unlock(); 560 } else { 561 rcu_read_lock(); 562 mpath = mesh_path_lookup(target_addr, sdata); 563 if (mpath) { 564 if ((!(mpath->flags & MESH_PATH_SN_VALID)) || 565 SN_LT(mpath->sn, target_sn)) { 566 mpath->sn = target_sn; 567 mpath->flags |= MESH_PATH_SN_VALID; 568 } else if ((!(target_flags & MP_F_DO)) && 569 (mpath->flags & MESH_PATH_ACTIVE)) { 570 reply = true; 571 metric = mpath->metric; 572 target_sn = mpath->sn; 573 if (target_flags & MP_F_RF) 574 target_flags |= MP_F_DO; 575 else 576 forward = false; 577 } 578 } 579 rcu_read_unlock(); 580 } 581 582 if (reply) { 583 lifetime = PREQ_IE_LIFETIME(preq_elem); 584 ttl = ifmsh->mshcfg.element_ttl; 585 if (ttl != 0) { 586 mhwmp_dbg(sdata, "replying to the PREQ\n"); 587 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, 588 cpu_to_le32(orig_sn), 0, target_addr, 589 cpu_to_le32(target_sn), mgmt->sa, 0, ttl, 590 cpu_to_le32(lifetime), cpu_to_le32(metric), 591 0, sdata); 592 } else { 593 ifmsh->mshstats.dropped_frames_ttl++; 594 } 595 } 596 597 if (forward && ifmsh->mshcfg.dot11MeshForwarding) { 598 u32 preq_id; 599 u8 hopcount; 600 601 ttl = PREQ_IE_TTL(preq_elem); 602 lifetime = PREQ_IE_LIFETIME(preq_elem); 603 if (ttl <= 1) { 604 ifmsh->mshstats.dropped_frames_ttl++; 605 return; 606 } 607 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); 608 --ttl; 609 preq_id = PREQ_IE_PREQ_ID(preq_elem); 610 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; 611 da = (mpath && mpath->is_root) ? 612 mpath->rann_snd_addr : broadcast_addr; 613 614 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 615 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 616 target_sn = PREQ_IE_TARGET_SN(preq_elem); 617 metric = orig_metric; 618 } 619 620 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, 621 cpu_to_le32(orig_sn), target_flags, target_addr, 622 cpu_to_le32(target_sn), da, 623 hopcount, ttl, cpu_to_le32(lifetime), 624 cpu_to_le32(metric), cpu_to_le32(preq_id), 625 sdata); 626 if (!is_multicast_ether_addr(da)) 627 ifmsh->mshstats.fwded_unicast++; 628 else 629 ifmsh->mshstats.fwded_mcast++; 630 ifmsh->mshstats.fwded_frames++; 631 } 632 } 633 634 635 static inline struct sta_info * 636 next_hop_deref_protected(struct mesh_path *mpath) 637 { 638 return rcu_dereference_protected(mpath->next_hop, 639 lockdep_is_held(&mpath->state_lock)); 640 } 641 642 643 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, 644 struct ieee80211_mgmt *mgmt, 645 u8 *prep_elem, u32 metric) 646 { 647 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 648 struct mesh_path *mpath; 649 u8 *target_addr, *orig_addr; 650 u8 ttl, hopcount, flags; 651 u8 next_hop[ETH_ALEN]; 652 u32 target_sn, orig_sn, lifetime; 653 654 mhwmp_dbg(sdata, "received PREP from %pM\n", 655 PREP_IE_ORIG_ADDR(prep_elem)); 656 657 orig_addr = PREP_IE_ORIG_ADDR(prep_elem); 658 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 659 /* destination, no forwarding required */ 660 return; 661 662 if (!ifmsh->mshcfg.dot11MeshForwarding) 663 return; 664 665 ttl = PREP_IE_TTL(prep_elem); 666 if (ttl <= 1) { 667 sdata->u.mesh.mshstats.dropped_frames_ttl++; 668 return; 669 } 670 671 rcu_read_lock(); 672 mpath = mesh_path_lookup(orig_addr, sdata); 673 if (mpath) 674 spin_lock_bh(&mpath->state_lock); 675 else 676 goto fail; 677 if (!(mpath->flags & MESH_PATH_ACTIVE)) { 678 spin_unlock_bh(&mpath->state_lock); 679 goto fail; 680 } 681 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); 682 spin_unlock_bh(&mpath->state_lock); 683 --ttl; 684 flags = PREP_IE_FLAGS(prep_elem); 685 lifetime = PREP_IE_LIFETIME(prep_elem); 686 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; 687 target_addr = PREP_IE_TARGET_ADDR(prep_elem); 688 target_sn = PREP_IE_TARGET_SN(prep_elem); 689 orig_sn = PREP_IE_ORIG_SN(prep_elem); 690 691 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, 692 cpu_to_le32(orig_sn), 0, target_addr, 693 cpu_to_le32(target_sn), next_hop, hopcount, 694 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), 695 0, sdata); 696 rcu_read_unlock(); 697 698 sdata->u.mesh.mshstats.fwded_unicast++; 699 sdata->u.mesh.mshstats.fwded_frames++; 700 return; 701 702 fail: 703 rcu_read_unlock(); 704 sdata->u.mesh.mshstats.dropped_frames_no_route++; 705 } 706 707 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, 708 struct ieee80211_mgmt *mgmt, u8 *perr_elem) 709 { 710 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 711 struct mesh_path *mpath; 712 u8 ttl; 713 u8 *ta, *target_addr; 714 u32 target_sn; 715 u16 target_rcode; 716 717 ta = mgmt->sa; 718 ttl = PERR_IE_TTL(perr_elem); 719 if (ttl <= 1) { 720 ifmsh->mshstats.dropped_frames_ttl++; 721 return; 722 } 723 ttl--; 724 target_addr = PERR_IE_TARGET_ADDR(perr_elem); 725 target_sn = PERR_IE_TARGET_SN(perr_elem); 726 target_rcode = PERR_IE_TARGET_RCODE(perr_elem); 727 728 rcu_read_lock(); 729 mpath = mesh_path_lookup(target_addr, sdata); 730 if (mpath) { 731 struct sta_info *sta; 732 733 spin_lock_bh(&mpath->state_lock); 734 sta = next_hop_deref_protected(mpath); 735 if (mpath->flags & MESH_PATH_ACTIVE && 736 ether_addr_equal(ta, sta->sta.addr) && 737 (!(mpath->flags & MESH_PATH_SN_VALID) || 738 SN_GT(target_sn, mpath->sn))) { 739 mpath->flags &= ~MESH_PATH_ACTIVE; 740 mpath->sn = target_sn; 741 spin_unlock_bh(&mpath->state_lock); 742 if (!ifmsh->mshcfg.dot11MeshForwarding) 743 goto endperr; 744 mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), 745 cpu_to_le16(target_rcode), 746 broadcast_addr, sdata); 747 } else 748 spin_unlock_bh(&mpath->state_lock); 749 } 750 endperr: 751 rcu_read_unlock(); 752 } 753 754 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, 755 struct ieee80211_mgmt *mgmt, 756 struct ieee80211_rann_ie *rann) 757 { 758 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 759 struct ieee80211_local *local = sdata->local; 760 struct sta_info *sta; 761 struct mesh_path *mpath; 762 u8 ttl, flags, hopcount; 763 u8 *orig_addr; 764 u32 orig_sn, metric, metric_txsta, interval; 765 bool root_is_gate; 766 767 ttl = rann->rann_ttl; 768 flags = rann->rann_flags; 769 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 770 orig_addr = rann->rann_addr; 771 orig_sn = le32_to_cpu(rann->rann_seq); 772 interval = le32_to_cpu(rann->rann_interval); 773 hopcount = rann->rann_hopcount; 774 hopcount++; 775 metric = le32_to_cpu(rann->rann_metric); 776 777 /* Ignore our own RANNs */ 778 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 779 return; 780 781 mhwmp_dbg(sdata, 782 "received RANN from %pM via neighbour %pM (is_gate=%d)\n", 783 orig_addr, mgmt->sa, root_is_gate); 784 785 rcu_read_lock(); 786 sta = sta_info_get(sdata, mgmt->sa); 787 if (!sta) { 788 rcu_read_unlock(); 789 return; 790 } 791 792 metric_txsta = airtime_link_metric_get(local, sta); 793 794 mpath = mesh_path_lookup(orig_addr, sdata); 795 if (!mpath) { 796 mesh_path_add(orig_addr, sdata); 797 mpath = mesh_path_lookup(orig_addr, sdata); 798 if (!mpath) { 799 rcu_read_unlock(); 800 sdata->u.mesh.mshstats.dropped_frames_no_route++; 801 return; 802 } 803 } 804 805 if (!(SN_LT(mpath->sn, orig_sn)) && 806 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { 807 rcu_read_unlock(); 808 return; 809 } 810 811 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || 812 (time_after(jiffies, mpath->last_preq_to_root + 813 root_path_confirmation_jiffies(sdata)) || 814 time_before(jiffies, mpath->last_preq_to_root))) && 815 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { 816 mhwmp_dbg(sdata, 817 "time to refresh root mpath %pM\n", 818 orig_addr); 819 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); 820 mpath->last_preq_to_root = jiffies; 821 } 822 823 mpath->sn = orig_sn; 824 mpath->rann_metric = metric + metric_txsta; 825 mpath->is_root = true; 826 /* Recording RANNs sender address to send individually 827 * addressed PREQs destined for root mesh STA */ 828 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); 829 830 if (root_is_gate) 831 mesh_path_add_gate(mpath); 832 833 if (ttl <= 1) { 834 ifmsh->mshstats.dropped_frames_ttl++; 835 rcu_read_unlock(); 836 return; 837 } 838 ttl--; 839 840 if (ifmsh->mshcfg.dot11MeshForwarding) { 841 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, 842 cpu_to_le32(orig_sn), 843 0, NULL, 0, broadcast_addr, 844 hopcount, ttl, cpu_to_le32(interval), 845 cpu_to_le32(metric + metric_txsta), 846 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, 855 size_t len) 856 { 857 struct ieee802_11_elems elems; 858 size_t baselen; 859 u32 last_hop_metric; 860 struct sta_info *sta; 861 862 /* need action_code */ 863 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 864 return; 865 866 rcu_read_lock(); 867 sta = sta_info_get(sdata, mgmt->sa); 868 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { 869 rcu_read_unlock(); 870 return; 871 } 872 rcu_read_unlock(); 873 874 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; 875 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, 876 len - baselen, &elems); 877 878 if (elems.preq) { 879 if (elems.preq_len != 37) 880 /* Right now we support just 1 destination and no AE */ 881 return; 882 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, 883 MPATH_PREQ); 884 if (last_hop_metric) 885 hwmp_preq_frame_process(sdata, mgmt, elems.preq, 886 last_hop_metric); 887 } 888 if (elems.prep) { 889 if (elems.prep_len != 31) 890 /* Right now we support no AE */ 891 return; 892 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, 893 MPATH_PREP); 894 if (last_hop_metric) 895 hwmp_prep_frame_process(sdata, mgmt, elems.prep, 896 last_hop_metric); 897 } 898 if (elems.perr) { 899 if (elems.perr_len != 15) 900 /* Right now we support only one destination per PERR */ 901 return; 902 hwmp_perr_frame_process(sdata, mgmt, elems.perr); 903 } 904 if (elems.rann) 905 hwmp_rann_frame_process(sdata, mgmt, elems.rann); 906 } 907 908 /** 909 * mesh_queue_preq - queue a PREQ to a given destination 910 * 911 * @mpath: mesh path to discover 912 * @flags: special attributes of the PREQ to be sent 913 * 914 * Locking: the function must be called from within a rcu read lock block. 915 * 916 */ 917 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) 918 { 919 struct ieee80211_sub_if_data *sdata = mpath->sdata; 920 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 921 struct mesh_preq_queue *preq_node; 922 923 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); 924 if (!preq_node) { 925 mhwmp_dbg(sdata, "could not allocate PREQ node\n"); 926 return; 927 } 928 929 spin_lock_bh(&ifmsh->mesh_preq_queue_lock); 930 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { 931 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 932 kfree(preq_node); 933 if (printk_ratelimit()) 934 mhwmp_dbg(sdata, "PREQ node queue full\n"); 935 return; 936 } 937 938 spin_lock(&mpath->state_lock); 939 if (mpath->flags & MESH_PATH_REQ_QUEUED) { 940 spin_unlock(&mpath->state_lock); 941 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 942 kfree(preq_node); 943 return; 944 } 945 946 memcpy(preq_node->dst, mpath->dst, ETH_ALEN); 947 preq_node->flags = flags; 948 949 mpath->flags |= MESH_PATH_REQ_QUEUED; 950 spin_unlock(&mpath->state_lock); 951 952 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); 953 ++ifmsh->preq_queue_len; 954 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 955 956 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) 957 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 958 959 else if (time_before(jiffies, ifmsh->last_preq)) { 960 /* avoid long wait if did not send preqs for a long time 961 * and jiffies wrapped around 962 */ 963 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; 964 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 965 } else 966 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + 967 min_preq_int_jiff(sdata)); 968 } 969 970 /** 971 * mesh_path_start_discovery - launch a path discovery from the PREQ queue 972 * 973 * @sdata: local mesh subif 974 */ 975 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) 976 { 977 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 978 struct mesh_preq_queue *preq_node; 979 struct mesh_path *mpath; 980 u8 ttl, target_flags; 981 const u8 *da; 982 u32 lifetime; 983 984 spin_lock_bh(&ifmsh->mesh_preq_queue_lock); 985 if (!ifmsh->preq_queue_len || 986 time_before(jiffies, ifmsh->last_preq + 987 min_preq_int_jiff(sdata))) { 988 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 989 return; 990 } 991 992 preq_node = list_first_entry(&ifmsh->preq_queue.list, 993 struct mesh_preq_queue, list); 994 list_del(&preq_node->list); 995 --ifmsh->preq_queue_len; 996 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); 997 998 rcu_read_lock(); 999 mpath = mesh_path_lookup(preq_node->dst, sdata); 1000 if (!mpath) 1001 goto enddiscovery; 1002 1003 spin_lock_bh(&mpath->state_lock); 1004 mpath->flags &= ~MESH_PATH_REQ_QUEUED; 1005 if (preq_node->flags & PREQ_Q_F_START) { 1006 if (mpath->flags & MESH_PATH_RESOLVING) { 1007 spin_unlock_bh(&mpath->state_lock); 1008 goto enddiscovery; 1009 } else { 1010 mpath->flags &= ~MESH_PATH_RESOLVED; 1011 mpath->flags |= MESH_PATH_RESOLVING; 1012 mpath->discovery_retries = 0; 1013 mpath->discovery_timeout = disc_timeout_jiff(sdata); 1014 } 1015 } else if (!(mpath->flags & MESH_PATH_RESOLVING) || 1016 mpath->flags & MESH_PATH_RESOLVED) { 1017 mpath->flags &= ~MESH_PATH_RESOLVING; 1018 spin_unlock_bh(&mpath->state_lock); 1019 goto enddiscovery; 1020 } 1021 1022 ifmsh->last_preq = jiffies; 1023 1024 if (time_after(jiffies, ifmsh->last_sn_update + 1025 net_traversal_jiffies(sdata)) || 1026 time_before(jiffies, ifmsh->last_sn_update)) { 1027 ++ifmsh->sn; 1028 sdata->u.mesh.last_sn_update = jiffies; 1029 } 1030 lifetime = default_lifetime(sdata); 1031 ttl = sdata->u.mesh.mshcfg.element_ttl; 1032 if (ttl == 0) { 1033 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1034 spin_unlock_bh(&mpath->state_lock); 1035 goto enddiscovery; 1036 } 1037 1038 if (preq_node->flags & PREQ_Q_F_REFRESH) 1039 target_flags = MP_F_DO; 1040 else 1041 target_flags = MP_F_RF; 1042 1043 spin_unlock_bh(&mpath->state_lock); 1044 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; 1045 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, 1046 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, 1047 cpu_to_le32(mpath->sn), da, 0, 1048 ttl, cpu_to_le32(lifetime), 0, 1049 cpu_to_le32(ifmsh->preq_id++), sdata); 1050 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); 1051 1052 enddiscovery: 1053 rcu_read_unlock(); 1054 kfree(preq_node); 1055 } 1056 1057 /** 1058 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery 1059 * 1060 * @skb: 802.11 frame to be sent 1061 * @sdata: network subif the frame will be sent through 1062 * 1063 * Lookup next hop for given skb and start path discovery if no 1064 * forwarding information is found. 1065 * 1066 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. 1067 * skb is freeed here if no mpath could be allocated. 1068 */ 1069 int mesh_nexthop_resolve(struct sk_buff *skb, 1070 struct ieee80211_sub_if_data *sdata) 1071 { 1072 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1073 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1074 struct mesh_path *mpath; 1075 struct sk_buff *skb_to_free = NULL; 1076 u8 *target_addr = hdr->addr3; 1077 int err = 0; 1078 1079 rcu_read_lock(); 1080 err = mesh_nexthop_lookup(skb, sdata); 1081 if (!err) 1082 goto endlookup; 1083 1084 /* no nexthop found, start resolving */ 1085 mpath = mesh_path_lookup(target_addr, sdata); 1086 if (!mpath) { 1087 mesh_path_add(target_addr, sdata); 1088 mpath = mesh_path_lookup(target_addr, sdata); 1089 if (!mpath) { 1090 mesh_path_discard_frame(skb, sdata); 1091 err = -ENOSPC; 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(skb_to_free, sdata); 1108 1109 endlookup: 1110 rcu_read_unlock(); 1111 return err; 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 sk_buff *skb, 1124 struct ieee80211_sub_if_data *sdata) 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(target_addr, sdata); 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 err = 0; 1151 } 1152 1153 endlookup: 1154 rcu_read_unlock(); 1155 return err; 1156 } 1157 1158 void mesh_path_timer(unsigned long data) 1159 { 1160 struct mesh_path *mpath = (void *) data; 1161 struct ieee80211_sub_if_data *sdata = mpath->sdata; 1162 int ret; 1163 1164 if (sdata->local->quiescing) 1165 return; 1166 1167 spin_lock_bh(&mpath->state_lock); 1168 if (mpath->flags & MESH_PATH_RESOLVED || 1169 (!(mpath->flags & MESH_PATH_RESOLVING))) { 1170 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); 1171 spin_unlock_bh(&mpath->state_lock); 1172 } else if (mpath->discovery_retries < max_preq_retries(sdata)) { 1173 ++mpath->discovery_retries; 1174 mpath->discovery_timeout *= 2; 1175 mpath->flags &= ~MESH_PATH_REQ_QUEUED; 1176 spin_unlock_bh(&mpath->state_lock); 1177 mesh_queue_preq(mpath, 0); 1178 } else { 1179 mpath->flags = 0; 1180 mpath->exp_time = jiffies; 1181 spin_unlock_bh(&mpath->state_lock); 1182 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { 1183 ret = mesh_path_send_to_gates(mpath); 1184 if (ret) 1185 mhwmp_dbg(sdata, "no gate was reachable\n"); 1186 } else 1187 mesh_path_flush_pending(mpath); 1188 } 1189 } 1190 1191 void 1192 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 cpu_to_le32(++ifmsh->sn), 1205 0, NULL, 0, broadcast_addr, 1206 0, ifmsh->mshcfg.element_ttl, 1207 cpu_to_le32(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 cpu_to_le32(++ifmsh->sn), target_flags, 1217 (u8 *) broadcast_addr, 0, broadcast_addr, 1218 0, ifmsh->mshcfg.element_ttl, 1219 cpu_to_le32(interval), 1220 0, cpu_to_le32(ifmsh->preq_id++), sdata); 1221 break; 1222 default: 1223 mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); 1224 return; 1225 } 1226 } 1227