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(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 u32 u16_field_get(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 u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, 106 __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, 107 __le32 lifetime, __le32 metric, __le32 preq_id, 108 struct ieee80211_sub_if_data *sdata) 109 { 110 struct ieee80211_local *local = sdata->local; 111 struct sk_buff *skb; 112 struct ieee80211_mgmt *mgmt; 113 u8 *pos, ie_len; 114 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + 115 sizeof(mgmt->u.action.u.mesh_action); 116 117 skb = dev_alloc_skb(local->tx_headroom + 118 hdr_len + 119 2 + 37); /* max HWMP IE */ 120 if (!skb) 121 return -1; 122 skb_reserve(skb, local->tx_headroom); 123 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 124 memset(mgmt, 0, hdr_len); 125 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 126 IEEE80211_STYPE_ACTION); 127 128 memcpy(mgmt->da, da, ETH_ALEN); 129 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 130 /* BSSID == SA */ 131 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 132 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; 133 mgmt->u.action.u.mesh_action.action_code = 134 WLAN_MESH_ACTION_HWMP_PATH_SELECTION; 135 136 switch (action) { 137 case MPATH_PREQ: 138 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); 139 ie_len = 37; 140 pos = skb_put(skb, 2 + ie_len); 141 *pos++ = WLAN_EID_PREQ; 142 break; 143 case MPATH_PREP: 144 mhwmp_dbg(sdata, "sending PREP to %pM\n", target); 145 ie_len = 31; 146 pos = skb_put(skb, 2 + ie_len); 147 *pos++ = WLAN_EID_PREP; 148 break; 149 case MPATH_RANN: 150 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); 151 ie_len = sizeof(struct ieee80211_rann_ie); 152 pos = skb_put(skb, 2 + ie_len); 153 *pos++ = WLAN_EID_RANN; 154 break; 155 default: 156 kfree_skb(skb); 157 return -ENOTSUPP; 158 break; 159 } 160 *pos++ = ie_len; 161 *pos++ = flags; 162 *pos++ = hop_count; 163 *pos++ = ttl; 164 if (action == MPATH_PREP) { 165 memcpy(pos, target, ETH_ALEN); 166 pos += ETH_ALEN; 167 memcpy(pos, &target_sn, 4); 168 pos += 4; 169 } else { 170 if (action == MPATH_PREQ) { 171 memcpy(pos, &preq_id, 4); 172 pos += 4; 173 } 174 memcpy(pos, orig_addr, ETH_ALEN); 175 pos += ETH_ALEN; 176 memcpy(pos, &orig_sn, 4); 177 pos += 4; 178 } 179 memcpy(pos, &lifetime, 4); /* interval for RANN */ 180 pos += 4; 181 memcpy(pos, &metric, 4); 182 pos += 4; 183 if (action == MPATH_PREQ) { 184 *pos++ = 1; /* destination count */ 185 *pos++ = target_flags; 186 memcpy(pos, target, ETH_ALEN); 187 pos += ETH_ALEN; 188 memcpy(pos, &target_sn, 4); 189 pos += 4; 190 } else if (action == MPATH_PREP) { 191 memcpy(pos, orig_addr, ETH_ALEN); 192 pos += ETH_ALEN; 193 memcpy(pos, &orig_sn, 4); 194 pos += 4; 195 } 196 197 ieee80211_tx_skb(sdata, skb); 198 return 0; 199 } 200 201 202 /* Headroom is not adjusted. Caller should ensure that skb has sufficient 203 * headroom in case the frame is encrypted. */ 204 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, 205 struct sk_buff *skb) 206 { 207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 208 209 skb_set_mac_header(skb, 0); 210 skb_set_network_header(skb, 0); 211 skb_set_transport_header(skb, 0); 212 213 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ 214 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 215 skb->priority = 7; 216 217 info->control.vif = &sdata->vif; 218 ieee80211_set_qos_hdr(sdata, skb); 219 } 220 221 /** 222 * mesh_send_path error - Sends a PERR mesh management frame 223 * 224 * @target: broken destination 225 * @target_sn: SN of the broken destination 226 * @target_rcode: reason code for this PERR 227 * @ra: node this frame is addressed to 228 * 229 * Note: This function may be called with driver locks taken that the driver 230 * also acquires in the TX path. To avoid a deadlock we don't transmit the 231 * frame directly but add it to the pending queue instead. 232 */ 233 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, 234 __le16 target_rcode, const u8 *ra, 235 struct ieee80211_sub_if_data *sdata) 236 { 237 struct ieee80211_local *local = sdata->local; 238 struct sk_buff *skb; 239 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 240 struct ieee80211_mgmt *mgmt; 241 u8 *pos, ie_len; 242 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + 243 sizeof(mgmt->u.action.u.mesh_action); 244 245 if (time_before(jiffies, ifmsh->next_perr)) 246 return -EAGAIN; 247 248 skb = dev_alloc_skb(local->tx_headroom + 249 hdr_len + 250 2 + 15 /* PERR IE */); 251 if (!skb) 252 return -1; 253 skb_reserve(skb, local->tx_headroom); 254 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 255 memset(mgmt, 0, hdr_len); 256 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 257 IEEE80211_STYPE_ACTION); 258 259 memcpy(mgmt->da, ra, ETH_ALEN); 260 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 261 /* BSSID == SA */ 262 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 263 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; 264 mgmt->u.action.u.mesh_action.action_code = 265 WLAN_MESH_ACTION_HWMP_PATH_SELECTION; 266 ie_len = 15; 267 pos = skb_put(skb, 2 + ie_len); 268 *pos++ = WLAN_EID_PERR; 269 *pos++ = ie_len; 270 /* ttl */ 271 *pos++ = ttl; 272 /* number of destinations */ 273 *pos++ = 1; 274 /* 275 * flags bit, bit 1 is unset if we know the sequence number and 276 * bit 2 is set if we have a reason code 277 */ 278 *pos = 0; 279 if (!target_sn) 280 *pos |= MP_F_USN; 281 if (target_rcode) 282 *pos |= MP_F_RCODE; 283 pos++; 284 memcpy(pos, target, ETH_ALEN); 285 pos += ETH_ALEN; 286 memcpy(pos, &target_sn, 4); 287 pos += 4; 288 memcpy(pos, &target_rcode, 2); 289 290 /* see note in function header */ 291 prepare_frame_for_deferred_tx(sdata, skb); 292 ifmsh->next_perr = TU_TO_EXP_TIME( 293 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); 294 ieee80211_add_pending_skb(local, skb); 295 return 0; 296 } 297 298 void ieee80211s_update_metric(struct ieee80211_local *local, 299 struct sta_info *sta, struct sk_buff *skb) 300 { 301 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); 302 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 303 int failed; 304 305 if (!ieee80211_is_data(hdr->frame_control)) 306 return; 307 308 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); 309 310 /* moving average, scaled to 100 */ 311 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); 312 if (sta->fail_avg > 95) 313 mesh_plink_broken(sta); 314 } 315 316 static u32 airtime_link_metric_get(struct ieee80211_local *local, 317 struct sta_info *sta) 318 { 319 struct rate_info rinfo; 320 /* This should be adjusted for each device */ 321 int device_constant = 1 << ARITH_SHIFT; 322 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; 323 int s_unit = 1 << ARITH_SHIFT; 324 int rate, err; 325 u32 tx_time, estimated_retx; 326 u64 result; 327 328 if (sta->fail_avg >= 100) 329 return MAX_METRIC; 330 331 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); 332 rate = cfg80211_calculate_bitrate(&rinfo); 333 if (WARN_ON(!rate)) 334 return MAX_METRIC; 335 336 err = (sta->fail_avg << ARITH_SHIFT) / 100; 337 338 /* bitrate is in units of 100 Kbps, while we need rate in units of 339 * 1Mbps. This will be corrected on tx_time computation. 340 */ 341 tx_time = (device_constant + 10 * test_frame_len / rate); 342 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); 343 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; 344 return (u32)result; 345 } 346 347 /** 348 * hwmp_route_info_get - Update routing info to originator and transmitter 349 * 350 * @sdata: local mesh subif 351 * @mgmt: mesh management frame 352 * @hwmp_ie: hwmp information element (PREP or PREQ) 353 * 354 * This function updates the path routing information to the originator and the 355 * transmitter of a HWMP PREQ or PREP frame. 356 * 357 * Returns: metric to frame originator or 0 if the frame should not be further 358 * processed 359 * 360 * Notes: this function is the only place (besides user-provided info) where 361 * path routing information is updated. 362 */ 363 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, 364 struct ieee80211_mgmt *mgmt, 365 u8 *hwmp_ie, enum mpath_frame_type action) 366 { 367 struct ieee80211_local *local = sdata->local; 368 struct mesh_path *mpath; 369 struct sta_info *sta; 370 bool fresh_info; 371 u8 *orig_addr, *ta; 372 u32 orig_sn, orig_metric; 373 unsigned long orig_lifetime, exp_time; 374 u32 last_hop_metric, new_metric; 375 bool process = true; 376 377 rcu_read_lock(); 378 sta = sta_info_get(sdata, mgmt->sa); 379 if (!sta) { 380 rcu_read_unlock(); 381 return 0; 382 } 383 384 last_hop_metric = airtime_link_metric_get(local, sta); 385 /* Update and check originator routing info */ 386 fresh_info = true; 387 388 switch (action) { 389 case MPATH_PREQ: 390 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); 391 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); 392 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); 393 orig_metric = PREQ_IE_METRIC(hwmp_ie); 394 break; 395 case MPATH_PREP: 396 /* Originator here refers to the MP that was the target in the 397 * Path Request. We divert from the nomenclature in the draft 398 * so that we can easily use a single function to gather path 399 * information from both PREQ and PREP frames. 400 */ 401 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); 402 orig_sn = PREP_IE_TARGET_SN(hwmp_ie); 403 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); 404 orig_metric = PREP_IE_METRIC(hwmp_ie); 405 break; 406 default: 407 rcu_read_unlock(); 408 return 0; 409 } 410 new_metric = orig_metric + last_hop_metric; 411 if (new_metric < orig_metric) 412 new_metric = MAX_METRIC; 413 exp_time = TU_TO_EXP_TIME(orig_lifetime); 414 415 if (ether_addr_equal(orig_addr, sdata->vif.addr)) { 416 /* This MP is the originator, we are not interested in this 417 * frame, except for updating transmitter's path info. 418 */ 419 process = false; 420 fresh_info = false; 421 } else { 422 mpath = mesh_path_lookup(orig_addr, sdata); 423 if (mpath) { 424 spin_lock_bh(&mpath->state_lock); 425 if (mpath->flags & MESH_PATH_FIXED) 426 fresh_info = false; 427 else if ((mpath->flags & MESH_PATH_ACTIVE) && 428 (mpath->flags & MESH_PATH_SN_VALID)) { 429 if (SN_GT(mpath->sn, orig_sn) || 430 (mpath->sn == orig_sn && 431 new_metric >= mpath->metric)) { 432 process = false; 433 fresh_info = false; 434 } 435 } 436 } else { 437 mesh_path_add(orig_addr, sdata); 438 mpath = mesh_path_lookup(orig_addr, sdata); 439 if (!mpath) { 440 rcu_read_unlock(); 441 return 0; 442 } 443 spin_lock_bh(&mpath->state_lock); 444 } 445 446 if (fresh_info) { 447 mesh_path_assign_nexthop(mpath, sta); 448 mpath->flags |= MESH_PATH_SN_VALID; 449 mpath->metric = new_metric; 450 mpath->sn = orig_sn; 451 mpath->exp_time = time_after(mpath->exp_time, exp_time) 452 ? mpath->exp_time : exp_time; 453 mesh_path_activate(mpath); 454 spin_unlock_bh(&mpath->state_lock); 455 mesh_path_tx_pending(mpath); 456 /* draft says preq_id should be saved to, but there does 457 * not seem to be any use for it, skipping by now 458 */ 459 } else 460 spin_unlock_bh(&mpath->state_lock); 461 } 462 463 /* Update and check transmitter routing info */ 464 ta = mgmt->sa; 465 if (ether_addr_equal(orig_addr, ta)) 466 fresh_info = false; 467 else { 468 fresh_info = true; 469 470 mpath = mesh_path_lookup(ta, sdata); 471 if (mpath) { 472 spin_lock_bh(&mpath->state_lock); 473 if ((mpath->flags & MESH_PATH_FIXED) || 474 ((mpath->flags & MESH_PATH_ACTIVE) && 475 (last_hop_metric > mpath->metric))) 476 fresh_info = false; 477 } else { 478 mesh_path_add(ta, sdata); 479 mpath = mesh_path_lookup(ta, sdata); 480 if (!mpath) { 481 rcu_read_unlock(); 482 return 0; 483 } 484 spin_lock_bh(&mpath->state_lock); 485 } 486 487 if (fresh_info) { 488 mesh_path_assign_nexthop(mpath, sta); 489 mpath->metric = last_hop_metric; 490 mpath->exp_time = time_after(mpath->exp_time, exp_time) 491 ? mpath->exp_time : exp_time; 492 mesh_path_activate(mpath); 493 spin_unlock_bh(&mpath->state_lock); 494 mesh_path_tx_pending(mpath); 495 } else 496 spin_unlock_bh(&mpath->state_lock); 497 } 498 499 rcu_read_unlock(); 500 501 return process ? new_metric : 0; 502 } 503 504 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, 505 struct ieee80211_mgmt *mgmt, 506 u8 *preq_elem, u32 metric) 507 { 508 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 509 struct mesh_path *mpath = NULL; 510 u8 *target_addr, *orig_addr; 511 const u8 *da; 512 u8 target_flags, ttl, flags; 513 u32 orig_sn, target_sn, lifetime, orig_metric; 514 bool reply = false; 515 bool forward = true; 516 bool root_is_gate; 517 518 /* Update target SN, if present */ 519 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 520 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); 521 target_sn = PREQ_IE_TARGET_SN(preq_elem); 522 orig_sn = PREQ_IE_ORIG_SN(preq_elem); 523 target_flags = PREQ_IE_TARGET_F(preq_elem); 524 orig_metric = metric; 525 /* Proactive PREQ gate announcements */ 526 flags = PREQ_IE_FLAGS(preq_elem); 527 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 528 529 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); 530 531 if (ether_addr_equal(target_addr, sdata->vif.addr)) { 532 mhwmp_dbg(sdata, "PREQ is for us\n"); 533 forward = false; 534 reply = true; 535 metric = 0; 536 if (time_after(jiffies, ifmsh->last_sn_update + 537 net_traversal_jiffies(sdata)) || 538 time_before(jiffies, ifmsh->last_sn_update)) { 539 target_sn = ++ifmsh->sn; 540 ifmsh->last_sn_update = jiffies; 541 } 542 } else if (is_broadcast_ether_addr(target_addr) && 543 (target_flags & IEEE80211_PREQ_TO_FLAG)) { 544 rcu_read_lock(); 545 mpath = mesh_path_lookup(orig_addr, sdata); 546 if (mpath) { 547 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 548 reply = true; 549 target_addr = sdata->vif.addr; 550 target_sn = ++ifmsh->sn; 551 metric = 0; 552 ifmsh->last_sn_update = jiffies; 553 } 554 if (root_is_gate) 555 mesh_path_add_gate(mpath); 556 } 557 rcu_read_unlock(); 558 } else { 559 rcu_read_lock(); 560 mpath = mesh_path_lookup(target_addr, sdata); 561 if (mpath) { 562 if ((!(mpath->flags & MESH_PATH_SN_VALID)) || 563 SN_LT(mpath->sn, target_sn)) { 564 mpath->sn = target_sn; 565 mpath->flags |= MESH_PATH_SN_VALID; 566 } else if ((!(target_flags & MP_F_DO)) && 567 (mpath->flags & MESH_PATH_ACTIVE)) { 568 reply = true; 569 metric = mpath->metric; 570 target_sn = mpath->sn; 571 if (target_flags & MP_F_RF) 572 target_flags |= MP_F_DO; 573 else 574 forward = false; 575 } 576 } 577 rcu_read_unlock(); 578 } 579 580 if (reply) { 581 lifetime = PREQ_IE_LIFETIME(preq_elem); 582 ttl = ifmsh->mshcfg.element_ttl; 583 if (ttl != 0) { 584 mhwmp_dbg(sdata, "replying to the PREQ\n"); 585 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, 586 cpu_to_le32(orig_sn), 0, target_addr, 587 cpu_to_le32(target_sn), mgmt->sa, 0, ttl, 588 cpu_to_le32(lifetime), cpu_to_le32(metric), 589 0, sdata); 590 } else { 591 ifmsh->mshstats.dropped_frames_ttl++; 592 } 593 } 594 595 if (forward && ifmsh->mshcfg.dot11MeshForwarding) { 596 u32 preq_id; 597 u8 hopcount; 598 599 ttl = PREQ_IE_TTL(preq_elem); 600 lifetime = PREQ_IE_LIFETIME(preq_elem); 601 if (ttl <= 1) { 602 ifmsh->mshstats.dropped_frames_ttl++; 603 return; 604 } 605 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); 606 --ttl; 607 preq_id = PREQ_IE_PREQ_ID(preq_elem); 608 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; 609 da = (mpath && mpath->is_root) ? 610 mpath->rann_snd_addr : broadcast_addr; 611 612 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { 613 target_addr = PREQ_IE_TARGET_ADDR(preq_elem); 614 target_sn = PREQ_IE_TARGET_SN(preq_elem); 615 metric = orig_metric; 616 } 617 618 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, 619 cpu_to_le32(orig_sn), target_flags, target_addr, 620 cpu_to_le32(target_sn), da, 621 hopcount, ttl, cpu_to_le32(lifetime), 622 cpu_to_le32(metric), cpu_to_le32(preq_id), 623 sdata); 624 if (!is_multicast_ether_addr(da)) 625 ifmsh->mshstats.fwded_unicast++; 626 else 627 ifmsh->mshstats.fwded_mcast++; 628 ifmsh->mshstats.fwded_frames++; 629 } 630 } 631 632 633 static inline struct sta_info * 634 next_hop_deref_protected(struct mesh_path *mpath) 635 { 636 return rcu_dereference_protected(mpath->next_hop, 637 lockdep_is_held(&mpath->state_lock)); 638 } 639 640 641 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, 642 struct ieee80211_mgmt *mgmt, 643 u8 *prep_elem, u32 metric) 644 { 645 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 646 struct mesh_path *mpath; 647 u8 *target_addr, *orig_addr; 648 u8 ttl, hopcount, flags; 649 u8 next_hop[ETH_ALEN]; 650 u32 target_sn, orig_sn, lifetime; 651 652 mhwmp_dbg(sdata, "received PREP from %pM\n", 653 PREP_IE_ORIG_ADDR(prep_elem)); 654 655 orig_addr = PREP_IE_ORIG_ADDR(prep_elem); 656 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 657 /* destination, no forwarding required */ 658 return; 659 660 if (!ifmsh->mshcfg.dot11MeshForwarding) 661 return; 662 663 ttl = PREP_IE_TTL(prep_elem); 664 if (ttl <= 1) { 665 sdata->u.mesh.mshstats.dropped_frames_ttl++; 666 return; 667 } 668 669 rcu_read_lock(); 670 mpath = mesh_path_lookup(orig_addr, sdata); 671 if (mpath) 672 spin_lock_bh(&mpath->state_lock); 673 else 674 goto fail; 675 if (!(mpath->flags & MESH_PATH_ACTIVE)) { 676 spin_unlock_bh(&mpath->state_lock); 677 goto fail; 678 } 679 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); 680 spin_unlock_bh(&mpath->state_lock); 681 --ttl; 682 flags = PREP_IE_FLAGS(prep_elem); 683 lifetime = PREP_IE_LIFETIME(prep_elem); 684 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; 685 target_addr = PREP_IE_TARGET_ADDR(prep_elem); 686 target_sn = PREP_IE_TARGET_SN(prep_elem); 687 orig_sn = PREP_IE_ORIG_SN(prep_elem); 688 689 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, 690 cpu_to_le32(orig_sn), 0, target_addr, 691 cpu_to_le32(target_sn), next_hop, hopcount, 692 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), 693 0, sdata); 694 rcu_read_unlock(); 695 696 sdata->u.mesh.mshstats.fwded_unicast++; 697 sdata->u.mesh.mshstats.fwded_frames++; 698 return; 699 700 fail: 701 rcu_read_unlock(); 702 sdata->u.mesh.mshstats.dropped_frames_no_route++; 703 } 704 705 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, 706 struct ieee80211_mgmt *mgmt, u8 *perr_elem) 707 { 708 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 709 struct mesh_path *mpath; 710 u8 ttl; 711 u8 *ta, *target_addr; 712 u32 target_sn; 713 u16 target_rcode; 714 715 ta = mgmt->sa; 716 ttl = PERR_IE_TTL(perr_elem); 717 if (ttl <= 1) { 718 ifmsh->mshstats.dropped_frames_ttl++; 719 return; 720 } 721 ttl--; 722 target_addr = PERR_IE_TARGET_ADDR(perr_elem); 723 target_sn = PERR_IE_TARGET_SN(perr_elem); 724 target_rcode = PERR_IE_TARGET_RCODE(perr_elem); 725 726 rcu_read_lock(); 727 mpath = mesh_path_lookup(target_addr, sdata); 728 if (mpath) { 729 struct sta_info *sta; 730 731 spin_lock_bh(&mpath->state_lock); 732 sta = next_hop_deref_protected(mpath); 733 if (mpath->flags & MESH_PATH_ACTIVE && 734 ether_addr_equal(ta, sta->sta.addr) && 735 (!(mpath->flags & MESH_PATH_SN_VALID) || 736 SN_GT(target_sn, mpath->sn))) { 737 mpath->flags &= ~MESH_PATH_ACTIVE; 738 mpath->sn = target_sn; 739 spin_unlock_bh(&mpath->state_lock); 740 if (!ifmsh->mshcfg.dot11MeshForwarding) 741 goto endperr; 742 mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), 743 cpu_to_le16(target_rcode), 744 broadcast_addr, sdata); 745 } else 746 spin_unlock_bh(&mpath->state_lock); 747 } 748 endperr: 749 rcu_read_unlock(); 750 } 751 752 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, 753 struct ieee80211_mgmt *mgmt, 754 struct ieee80211_rann_ie *rann) 755 { 756 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 757 struct ieee80211_local *local = sdata->local; 758 struct sta_info *sta; 759 struct mesh_path *mpath; 760 u8 ttl, flags, hopcount; 761 u8 *orig_addr; 762 u32 orig_sn, metric, metric_txsta, interval; 763 bool root_is_gate; 764 765 ttl = rann->rann_ttl; 766 flags = rann->rann_flags; 767 root_is_gate = !!(flags & RANN_FLAG_IS_GATE); 768 orig_addr = rann->rann_addr; 769 orig_sn = le32_to_cpu(rann->rann_seq); 770 interval = le32_to_cpu(rann->rann_interval); 771 hopcount = rann->rann_hopcount; 772 hopcount++; 773 metric = le32_to_cpu(rann->rann_metric); 774 775 /* Ignore our own RANNs */ 776 if (ether_addr_equal(orig_addr, sdata->vif.addr)) 777 return; 778 779 mhwmp_dbg(sdata, 780 "received RANN from %pM via neighbour %pM (is_gate=%d)\n", 781 orig_addr, mgmt->sa, root_is_gate); 782 783 rcu_read_lock(); 784 sta = sta_info_get(sdata, mgmt->sa); 785 if (!sta) { 786 rcu_read_unlock(); 787 return; 788 } 789 790 metric_txsta = airtime_link_metric_get(local, sta); 791 792 mpath = mesh_path_lookup(orig_addr, sdata); 793 if (!mpath) { 794 mesh_path_add(orig_addr, sdata); 795 mpath = mesh_path_lookup(orig_addr, sdata); 796 if (!mpath) { 797 rcu_read_unlock(); 798 sdata->u.mesh.mshstats.dropped_frames_no_route++; 799 return; 800 } 801 } 802 803 if (!(SN_LT(mpath->sn, orig_sn)) && 804 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { 805 rcu_read_unlock(); 806 return; 807 } 808 809 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || 810 (time_after(jiffies, mpath->last_preq_to_root + 811 root_path_confirmation_jiffies(sdata)) || 812 time_before(jiffies, mpath->last_preq_to_root))) && 813 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { 814 mhwmp_dbg(sdata, 815 "time to refresh root mpath %pM\n", 816 orig_addr); 817 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); 818 mpath->last_preq_to_root = jiffies; 819 } 820 821 mpath->sn = orig_sn; 822 mpath->rann_metric = metric + metric_txsta; 823 mpath->is_root = true; 824 /* Recording RANNs sender address to send individually 825 * addressed PREQs destined for root mesh STA */ 826 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); 827 828 if (root_is_gate) 829 mesh_path_add_gate(mpath); 830 831 if (ttl <= 1) { 832 ifmsh->mshstats.dropped_frames_ttl++; 833 rcu_read_unlock(); 834 return; 835 } 836 ttl--; 837 838 if (ifmsh->mshcfg.dot11MeshForwarding) { 839 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, 840 cpu_to_le32(orig_sn), 841 0, NULL, 0, broadcast_addr, 842 hopcount, ttl, cpu_to_le32(interval), 843 cpu_to_le32(metric + metric_txsta), 844 0, sdata); 845 } 846 847 rcu_read_unlock(); 848 } 849 850 851 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 852 struct ieee80211_mgmt *mgmt, 853 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, &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(preq_node->dst, sdata); 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, 1044 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, 1045 cpu_to_le32(mpath->sn), da, 0, 1046 ttl, cpu_to_le32(lifetime), 0, 1047 cpu_to_le32(ifmsh->preq_id++), sdata); 1048 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); 1049 1050 enddiscovery: 1051 rcu_read_unlock(); 1052 kfree(preq_node); 1053 } 1054 1055 /** 1056 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery 1057 * 1058 * @skb: 802.11 frame to be sent 1059 * @sdata: network subif the frame will be sent through 1060 * 1061 * Lookup next hop for given skb and start path discovery if no 1062 * forwarding information is found. 1063 * 1064 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. 1065 * skb is freeed here if no mpath could be allocated. 1066 */ 1067 int mesh_nexthop_resolve(struct sk_buff *skb, 1068 struct ieee80211_sub_if_data *sdata) 1069 { 1070 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1072 struct mesh_path *mpath; 1073 struct sk_buff *skb_to_free = NULL; 1074 u8 *target_addr = hdr->addr3; 1075 int err = 0; 1076 1077 rcu_read_lock(); 1078 err = mesh_nexthop_lookup(skb, sdata); 1079 if (!err) 1080 goto endlookup; 1081 1082 /* no nexthop found, start resolving */ 1083 mpath = mesh_path_lookup(target_addr, sdata); 1084 if (!mpath) { 1085 mesh_path_add(target_addr, sdata); 1086 mpath = mesh_path_lookup(target_addr, sdata); 1087 if (!mpath) { 1088 mesh_path_discard_frame(skb, sdata); 1089 err = -ENOSPC; 1090 goto endlookup; 1091 } 1092 } 1093 1094 if (!(mpath->flags & MESH_PATH_RESOLVING)) 1095 mesh_queue_preq(mpath, PREQ_Q_F_START); 1096 1097 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) 1098 skb_to_free = skb_dequeue(&mpath->frame_queue); 1099 1100 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1101 ieee80211_set_qos_hdr(sdata, skb); 1102 skb_queue_tail(&mpath->frame_queue, skb); 1103 err = -ENOENT; 1104 if (skb_to_free) 1105 mesh_path_discard_frame(skb_to_free, sdata); 1106 1107 endlookup: 1108 rcu_read_unlock(); 1109 return err; 1110 } 1111 /** 1112 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling 1113 * this function is considered "using" the associated mpath, so preempt a path 1114 * refresh if this mpath expires soon. 1115 * 1116 * @skb: 802.11 frame to be sent 1117 * @sdata: network subif the frame will be sent through 1118 * 1119 * Returns: 0 if the next hop was found. Nonzero otherwise. 1120 */ 1121 int mesh_nexthop_lookup(struct sk_buff *skb, 1122 struct ieee80211_sub_if_data *sdata) 1123 { 1124 struct mesh_path *mpath; 1125 struct sta_info *next_hop; 1126 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1127 u8 *target_addr = hdr->addr3; 1128 int err = -ENOENT; 1129 1130 rcu_read_lock(); 1131 mpath = mesh_path_lookup(target_addr, sdata); 1132 1133 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) 1134 goto endlookup; 1135 1136 if (time_after(jiffies, 1137 mpath->exp_time - 1138 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && 1139 ether_addr_equal(sdata->vif.addr, hdr->addr4) && 1140 !(mpath->flags & MESH_PATH_RESOLVING) && 1141 !(mpath->flags & MESH_PATH_FIXED)) 1142 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); 1143 1144 next_hop = rcu_dereference(mpath->next_hop); 1145 if (next_hop) { 1146 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); 1147 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 1148 err = 0; 1149 } 1150 1151 endlookup: 1152 rcu_read_unlock(); 1153 return err; 1154 } 1155 1156 void mesh_path_timer(unsigned long data) 1157 { 1158 struct mesh_path *mpath = (void *) data; 1159 struct ieee80211_sub_if_data *sdata = mpath->sdata; 1160 int ret; 1161 1162 if (sdata->local->quiescing) 1163 return; 1164 1165 spin_lock_bh(&mpath->state_lock); 1166 if (mpath->flags & MESH_PATH_RESOLVED || 1167 (!(mpath->flags & MESH_PATH_RESOLVING))) { 1168 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); 1169 spin_unlock_bh(&mpath->state_lock); 1170 } else if (mpath->discovery_retries < max_preq_retries(sdata)) { 1171 ++mpath->discovery_retries; 1172 mpath->discovery_timeout *= 2; 1173 mpath->flags &= ~MESH_PATH_REQ_QUEUED; 1174 spin_unlock_bh(&mpath->state_lock); 1175 mesh_queue_preq(mpath, 0); 1176 } else { 1177 mpath->flags = 0; 1178 mpath->exp_time = jiffies; 1179 spin_unlock_bh(&mpath->state_lock); 1180 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { 1181 ret = mesh_path_send_to_gates(mpath); 1182 if (ret) 1183 mhwmp_dbg(sdata, "no gate was reachable\n"); 1184 } else 1185 mesh_path_flush_pending(mpath); 1186 } 1187 } 1188 1189 void 1190 mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) 1191 { 1192 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 1193 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; 1194 u8 flags, target_flags = 0; 1195 1196 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) 1197 ? RANN_FLAG_IS_GATE : 0; 1198 1199 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { 1200 case IEEE80211_PROACTIVE_RANN: 1201 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, 1202 cpu_to_le32(++ifmsh->sn), 1203 0, NULL, 0, broadcast_addr, 1204 0, ifmsh->mshcfg.element_ttl, 1205 cpu_to_le32(interval), 0, 0, sdata); 1206 break; 1207 case IEEE80211_PROACTIVE_PREQ_WITH_PREP: 1208 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; 1209 case IEEE80211_PROACTIVE_PREQ_NO_PREP: 1210 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; 1211 target_flags |= IEEE80211_PREQ_TO_FLAG | 1212 IEEE80211_PREQ_USN_FLAG; 1213 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, 1214 cpu_to_le32(++ifmsh->sn), target_flags, 1215 (u8 *) broadcast_addr, 0, broadcast_addr, 1216 0, ifmsh->mshcfg.element_ttl, 1217 cpu_to_le32(interval), 1218 0, cpu_to_le32(ifmsh->preq_id++), sdata); 1219 break; 1220 default: 1221 mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); 1222 return; 1223 } 1224 } 1225