1 /* 2 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de> 3 * Copyright 2012-2013, cozybit Inc. 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 "mesh.h" 11 #include "wme.h" 12 13 14 /* mesh PS management */ 15 16 /** 17 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave 18 */ 19 static struct sk_buff *mps_qos_null_get(struct sta_info *sta) 20 { 21 struct ieee80211_sub_if_data *sdata = sta->sdata; 22 struct ieee80211_local *local = sdata->local; 23 struct ieee80211_hdr *nullfunc; /* use 4addr header */ 24 struct sk_buff *skb; 25 int size = sizeof(*nullfunc); 26 __le16 fc; 27 28 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2); 29 if (!skb) 30 return NULL; 31 skb_reserve(skb, local->hw.extra_tx_headroom); 32 33 nullfunc = (struct ieee80211_hdr *) skb_put(skb, size); 34 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC); 35 ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr, 36 sdata->vif.addr); 37 nullfunc->frame_control = fc; 38 nullfunc->duration_id = 0; 39 nullfunc->seq_ctrl = 0; 40 /* no address resolution for this frame -> set addr 1 immediately */ 41 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 42 memset(skb_put(skb, 2), 0, 2); /* append QoS control field */ 43 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc); 44 45 return skb; 46 } 47 48 /** 49 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode 50 */ 51 static void mps_qos_null_tx(struct sta_info *sta) 52 { 53 struct sk_buff *skb; 54 55 skb = mps_qos_null_get(sta); 56 if (!skb) 57 return; 58 59 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n", 60 sta->sta.addr); 61 62 /* don't unintentionally start a MPSP */ 63 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 64 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data); 65 66 qc[0] |= IEEE80211_QOS_CTL_EOSP; 67 } 68 69 ieee80211_tx_skb(sta->sdata, skb); 70 } 71 72 /** 73 * ieee80211_mps_local_status_update - track status of local link-specific PMs 74 * 75 * @sdata: local mesh subif 76 * 77 * sets the non-peer power mode and triggers the driver PS (re-)configuration 78 * Return BSS_CHANGED_BEACON if a beacon update is necessary. 79 */ 80 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata) 81 { 82 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 83 struct sta_info *sta; 84 bool peering = false; 85 int light_sleep_cnt = 0; 86 int deep_sleep_cnt = 0; 87 u32 changed = 0; 88 enum nl80211_mesh_power_mode nonpeer_pm; 89 90 rcu_read_lock(); 91 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 92 if (sdata != sta->sdata) 93 continue; 94 95 switch (sta->mesh->plink_state) { 96 case NL80211_PLINK_OPN_SNT: 97 case NL80211_PLINK_OPN_RCVD: 98 case NL80211_PLINK_CNF_RCVD: 99 peering = true; 100 break; 101 case NL80211_PLINK_ESTAB: 102 if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP) 103 light_sleep_cnt++; 104 else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP) 105 deep_sleep_cnt++; 106 break; 107 default: 108 break; 109 } 110 } 111 rcu_read_unlock(); 112 113 /* 114 * Set non-peer mode to active during peering/scanning/authentication 115 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is 116 * deep sleep if the local STA is in light or deep sleep towards at 117 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the 118 * user-configured default value. 119 */ 120 if (peering) { 121 mps_dbg(sdata, "setting non-peer PM to active for peering\n"); 122 nonpeer_pm = NL80211_MESH_POWER_ACTIVE; 123 } else if (light_sleep_cnt || deep_sleep_cnt) { 124 mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); 125 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; 126 } else { 127 mps_dbg(sdata, "setting non-peer PM to user value\n"); 128 nonpeer_pm = ifmsh->mshcfg.power_mode; 129 } 130 131 /* need update if sleep counts move between 0 and non-zero */ 132 if (ifmsh->nonpeer_pm != nonpeer_pm || 133 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt || 134 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt) 135 changed = BSS_CHANGED_BEACON; 136 137 ifmsh->nonpeer_pm = nonpeer_pm; 138 ifmsh->ps_peers_light_sleep = light_sleep_cnt; 139 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; 140 141 return changed; 142 } 143 144 /** 145 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA 146 * 147 * @sta: mesh STA 148 * @pm: the power mode to set 149 * Return BSS_CHANGED_BEACON if a beacon update is in order. 150 */ 151 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 152 enum nl80211_mesh_power_mode pm) 153 { 154 struct ieee80211_sub_if_data *sdata = sta->sdata; 155 156 if (sta->mesh->local_pm == pm) 157 return 0; 158 159 mps_dbg(sdata, "local STA operates in mode %d with %pM\n", 160 pm, sta->sta.addr); 161 162 sta->mesh->local_pm = pm; 163 164 /* 165 * announce peer-specific power mode transition 166 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3) 167 */ 168 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) 169 mps_qos_null_tx(sta); 170 171 return ieee80211_mps_local_status_update(sdata); 172 } 173 174 /** 175 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control) 176 * 177 * @sdata: local mesh subif 178 * @sta: mesh STA 179 * @hdr: 802.11 frame header 180 * 181 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11 182 * 183 * NOTE: sta must be given when an individually-addressed QoS frame header 184 * is handled, for group-addressed and management frames it is not used 185 */ 186 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 187 struct sta_info *sta, 188 struct ieee80211_hdr *hdr) 189 { 190 enum nl80211_mesh_power_mode pm; 191 u8 *qc; 192 193 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) && 194 ieee80211_is_data_qos(hdr->frame_control) && 195 !sta)) 196 return; 197 198 if (is_unicast_ether_addr(hdr->addr1) && 199 ieee80211_is_data_qos(hdr->frame_control) && 200 sta->mesh->plink_state == NL80211_PLINK_ESTAB) 201 pm = sta->mesh->local_pm; 202 else 203 pm = sdata->u.mesh.nonpeer_pm; 204 205 if (pm == NL80211_MESH_POWER_ACTIVE) 206 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM); 207 else 208 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 209 210 if (!ieee80211_is_data_qos(hdr->frame_control)) 211 return; 212 213 qc = ieee80211_get_qos_ctl(hdr); 214 215 if ((is_unicast_ether_addr(hdr->addr1) && 216 pm == NL80211_MESH_POWER_DEEP_SLEEP) || 217 (is_multicast_ether_addr(hdr->addr1) && 218 sdata->u.mesh.ps_peers_deep_sleep > 0)) 219 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); 220 else 221 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); 222 } 223 224 /** 225 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA 226 * 227 * @sta: mesh STA 228 * 229 * called after change of peering status or non-peer/peer-specific power mode 230 */ 231 void ieee80211_mps_sta_status_update(struct sta_info *sta) 232 { 233 enum nl80211_mesh_power_mode pm; 234 bool do_buffer; 235 236 /* For non-assoc STA, prevent buffering or frame transmission */ 237 if (sta->sta_state < IEEE80211_STA_ASSOC) 238 return; 239 240 /* 241 * use peer-specific power mode if peering is established and the 242 * peer's power mode is known 243 */ 244 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && 245 sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN) 246 pm = sta->mesh->peer_pm; 247 else 248 pm = sta->mesh->nonpeer_pm; 249 250 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE); 251 252 /* clear the MPSP flags for non-peers or active STA */ 253 if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) { 254 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 255 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 256 } else if (!do_buffer) { 257 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 258 } 259 260 /* Don't let the same PS state be set twice */ 261 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer) 262 return; 263 264 if (do_buffer) { 265 set_sta_flag(sta, WLAN_STA_PS_STA); 266 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps); 267 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n", 268 sta->sta.addr); 269 } else { 270 ieee80211_sta_ps_deliver_wakeup(sta); 271 } 272 } 273 274 static void mps_set_sta_peer_pm(struct sta_info *sta, 275 struct ieee80211_hdr *hdr) 276 { 277 enum nl80211_mesh_power_mode pm; 278 u8 *qc = ieee80211_get_qos_ctl(hdr); 279 280 /* 281 * Test Power Management field of frame control (PW) and 282 * mesh power save level subfield of QoS control field (PSL) 283 * 284 * | PM | PSL| Mesh PM | 285 * +----+----+---------+ 286 * | 0 |Rsrv| Active | 287 * | 1 | 0 | Light | 288 * | 1 | 1 | Deep | 289 */ 290 if (ieee80211_has_pm(hdr->frame_control)) { 291 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8)) 292 pm = NL80211_MESH_POWER_DEEP_SLEEP; 293 else 294 pm = NL80211_MESH_POWER_LIGHT_SLEEP; 295 } else { 296 pm = NL80211_MESH_POWER_ACTIVE; 297 } 298 299 if (sta->mesh->peer_pm == pm) 300 return; 301 302 mps_dbg(sta->sdata, "STA %pM enters mode %d\n", 303 sta->sta.addr, pm); 304 305 sta->mesh->peer_pm = pm; 306 307 ieee80211_mps_sta_status_update(sta); 308 } 309 310 static void mps_set_sta_nonpeer_pm(struct sta_info *sta, 311 struct ieee80211_hdr *hdr) 312 { 313 enum nl80211_mesh_power_mode pm; 314 315 if (ieee80211_has_pm(hdr->frame_control)) 316 pm = NL80211_MESH_POWER_DEEP_SLEEP; 317 else 318 pm = NL80211_MESH_POWER_ACTIVE; 319 320 if (sta->mesh->nonpeer_pm == pm) 321 return; 322 323 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n", 324 sta->sta.addr, pm); 325 326 sta->mesh->nonpeer_pm = pm; 327 328 ieee80211_mps_sta_status_update(sta); 329 } 330 331 /** 332 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave 333 * 334 * @sta: STA info that transmitted the frame 335 * @hdr: IEEE 802.11 (QoS) Header 336 */ 337 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 338 struct ieee80211_hdr *hdr) 339 { 340 if (is_unicast_ether_addr(hdr->addr1) && 341 ieee80211_is_data_qos(hdr->frame_control)) { 342 /* 343 * individually addressed QoS Data/Null frames contain 344 * peer link-specific PS mode towards the local STA 345 */ 346 mps_set_sta_peer_pm(sta, hdr); 347 348 /* check for mesh Peer Service Period trigger frames */ 349 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr), 350 sta, false, false); 351 } else { 352 /* 353 * can only determine non-peer PS mode 354 * (see IEEE802.11-2012 8.2.4.1.7) 355 */ 356 mps_set_sta_nonpeer_pm(sta, hdr); 357 } 358 } 359 360 361 /* mesh PS frame release */ 362 363 static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp) 364 { 365 struct ieee80211_sub_if_data *sdata = sta->sdata; 366 struct sk_buff *skb; 367 struct ieee80211_hdr *nullfunc; 368 struct ieee80211_tx_info *info; 369 u8 *qc; 370 371 skb = mps_qos_null_get(sta); 372 if (!skb) 373 return; 374 375 nullfunc = (struct ieee80211_hdr *) skb->data; 376 if (!eosp) 377 nullfunc->frame_control |= 378 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 379 /* 380 * | RSPI | EOSP | MPSP triggering | 381 * +------+------+--------------------+ 382 * | 0 | 0 | local STA is owner | 383 * | 0 | 1 | no MPSP (MPSP end) | 384 * | 1 | 0 | both STA are owner | 385 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2 386 */ 387 qc = ieee80211_get_qos_ctl(nullfunc); 388 if (rspi) 389 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8); 390 if (eosp) 391 qc[0] |= IEEE80211_QOS_CTL_EOSP; 392 393 info = IEEE80211_SKB_CB(skb); 394 395 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 396 IEEE80211_TX_CTL_REQ_TX_STATUS; 397 398 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n", 399 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr); 400 401 ieee80211_tx_skb(sdata, skb); 402 } 403 404 /** 405 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed 406 * 407 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP 408 * flag in the QoS Control field. In case the current tailing frame is not a 409 * QoS Data frame, append a QoS Null to carry the flag. 410 */ 411 static void mpsp_qos_null_append(struct sta_info *sta, 412 struct sk_buff_head *frames) 413 { 414 struct ieee80211_sub_if_data *sdata = sta->sdata; 415 struct sk_buff *new_skb, *skb = skb_peek_tail(frames); 416 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 417 struct ieee80211_tx_info *info; 418 419 if (ieee80211_is_data_qos(hdr->frame_control)) 420 return; 421 422 new_skb = mps_qos_null_get(sta); 423 if (!new_skb) 424 return; 425 426 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n", 427 sta->sta.addr); 428 /* 429 * This frame has to be transmitted last. Assign lowest priority to 430 * make sure it cannot pass other frames when releasing multiple ACs. 431 */ 432 new_skb->priority = 1; 433 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK); 434 ieee80211_set_qos_hdr(sdata, new_skb); 435 436 info = IEEE80211_SKB_CB(new_skb); 437 info->control.vif = &sdata->vif; 438 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 439 440 __skb_queue_tail(frames, new_skb); 441 } 442 443 /** 444 * mps_frame_deliver - transmit frames during mesh powersave 445 * 446 * @sta: STA info to transmit to 447 * @n_frames: number of frames to transmit. -1 for all 448 */ 449 static void mps_frame_deliver(struct sta_info *sta, int n_frames) 450 { 451 struct ieee80211_local *local = sta->sdata->local; 452 int ac; 453 struct sk_buff_head frames; 454 struct sk_buff *skb; 455 bool more_data = false; 456 457 skb_queue_head_init(&frames); 458 459 /* collect frame(s) from buffers */ 460 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 461 while (n_frames != 0) { 462 skb = skb_dequeue(&sta->tx_filtered[ac]); 463 if (!skb) { 464 skb = skb_dequeue( 465 &sta->ps_tx_buf[ac]); 466 if (skb) 467 local->total_ps_buffered--; 468 } 469 if (!skb) 470 break; 471 n_frames--; 472 __skb_queue_tail(&frames, skb); 473 } 474 475 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 476 !skb_queue_empty(&sta->ps_tx_buf[ac])) 477 more_data = true; 478 } 479 480 /* nothing to send? -> EOSP */ 481 if (skb_queue_empty(&frames)) { 482 mpsp_trigger_send(sta, false, true); 483 return; 484 } 485 486 /* in a MPSP make sure the last skb is a QoS Data frame */ 487 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 488 mpsp_qos_null_append(sta, &frames); 489 490 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n", 491 skb_queue_len(&frames), sta->sta.addr); 492 493 /* prepare collected frames for transmission */ 494 skb_queue_walk(&frames, skb) { 495 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 496 struct ieee80211_hdr *hdr = (void *) skb->data; 497 498 /* 499 * Tell TX path to send this frame even though the 500 * STA may still remain is PS mode after this frame 501 * exchange. 502 */ 503 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 504 505 if (more_data || !skb_queue_is_last(&frames, skb)) 506 hdr->frame_control |= 507 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 508 else 509 hdr->frame_control &= 510 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 511 512 if (skb_queue_is_last(&frames, skb) && 513 ieee80211_is_data_qos(hdr->frame_control)) { 514 u8 *qoshdr = ieee80211_get_qos_ctl(hdr); 515 516 /* MPSP trigger frame ends service period */ 517 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 518 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 519 } 520 } 521 522 ieee80211_add_pending_skbs(local, &frames); 523 sta_info_recalc_tim(sta); 524 } 525 526 /** 527 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods 528 * 529 * @qc: QoS Control field 530 * @sta: peer to start a MPSP with 531 * @tx: frame was transmitted by the local STA 532 * @acked: frame has been transmitted successfully 533 * 534 * NOTE: active mode STA may only serve as MPSP owner 535 */ 536 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 537 bool tx, bool acked) 538 { 539 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8); 540 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP; 541 542 if (tx) { 543 if (rspi && acked) 544 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 545 546 if (eosp) 547 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 548 else if (acked && 549 test_sta_flag(sta, WLAN_STA_PS_STA) && 550 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 551 mps_frame_deliver(sta, -1); 552 } else { 553 if (eosp) 554 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 555 else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE) 556 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 557 558 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 559 mps_frame_deliver(sta, -1); 560 } 561 } 562 563 /** 564 * ieee80211_mps_frame_release - release frames buffered due to mesh power save 565 * 566 * @sta: mesh STA 567 * @elems: IEs of beacon or probe response 568 * 569 * For peers if we have individually-addressed frames buffered or the peer 570 * indicates buffered frames, send a corresponding MPSP trigger frame. Since 571 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP 572 * trigger frames. If the neighbour STA is not a peer, only send single frames. 573 */ 574 void ieee80211_mps_frame_release(struct sta_info *sta, 575 struct ieee802_11_elems *elems) 576 { 577 int ac, buffer_local = 0; 578 bool has_buffered = false; 579 580 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) 581 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len, 582 sta->mesh->aid); 583 584 if (has_buffered) 585 mps_dbg(sta->sdata, "%pM indicates buffered frames\n", 586 sta->sta.addr); 587 588 /* only transmit to PS STA with announced, non-zero awake window */ 589 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 590 (!elems->awake_window || !le16_to_cpu(*elems->awake_window))) 591 return; 592 593 if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 594 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 595 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) + 596 skb_queue_len(&sta->tx_filtered[ac]); 597 598 if (!has_buffered && !buffer_local) 599 return; 600 601 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) 602 mpsp_trigger_send(sta, has_buffered, !buffer_local); 603 else 604 mps_frame_deliver(sta, 1); 605 } 606