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 /* no address resolution for this frame -> set addr 1 immediately */ 40 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); 41 memset(skb_put(skb, 2), 0, 2); /* append QoS control field */ 42 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc); 43 44 return skb; 45 } 46 47 /** 48 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode 49 */ 50 static void mps_qos_null_tx(struct sta_info *sta) 51 { 52 struct sk_buff *skb; 53 54 skb = mps_qos_null_get(sta); 55 if (!skb) 56 return; 57 58 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n", 59 sta->sta.addr); 60 61 /* don't unintentionally start a MPSP */ 62 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { 63 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data); 64 65 qc[0] |= IEEE80211_QOS_CTL_EOSP; 66 } 67 68 ieee80211_tx_skb(sta->sdata, skb); 69 } 70 71 /** 72 * ieee80211_mps_local_status_update - track status of local link-specific PMs 73 * 74 * @sdata: local mesh subif 75 * 76 * sets the non-peer power mode and triggers the driver PS (re-)configuration 77 * Return BSS_CHANGED_BEACON if a beacon update is necessary. 78 */ 79 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata) 80 { 81 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 82 struct sta_info *sta; 83 bool peering = false; 84 int light_sleep_cnt = 0; 85 int deep_sleep_cnt = 0; 86 u32 changed = 0; 87 enum nl80211_mesh_power_mode nonpeer_pm; 88 89 rcu_read_lock(); 90 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 91 if (sdata != sta->sdata) 92 continue; 93 94 switch (sta->plink_state) { 95 case NL80211_PLINK_OPN_SNT: 96 case NL80211_PLINK_OPN_RCVD: 97 case NL80211_PLINK_CNF_RCVD: 98 peering = true; 99 break; 100 case NL80211_PLINK_ESTAB: 101 if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP) 102 light_sleep_cnt++; 103 else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP) 104 deep_sleep_cnt++; 105 break; 106 default: 107 break; 108 } 109 } 110 rcu_read_unlock(); 111 112 /* 113 * Set non-peer mode to active during peering/scanning/authentication 114 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is 115 * deep sleep if the local STA is in light or deep sleep towards at 116 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the 117 * user-configured default value. 118 */ 119 if (peering) { 120 mps_dbg(sdata, "setting non-peer PM to active for peering\n"); 121 nonpeer_pm = NL80211_MESH_POWER_ACTIVE; 122 } else if (light_sleep_cnt || deep_sleep_cnt) { 123 mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); 124 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; 125 } else { 126 mps_dbg(sdata, "setting non-peer PM to user value\n"); 127 nonpeer_pm = ifmsh->mshcfg.power_mode; 128 } 129 130 /* need update if sleep counts move between 0 and non-zero */ 131 if (ifmsh->nonpeer_pm != nonpeer_pm || 132 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt || 133 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt) 134 changed = BSS_CHANGED_BEACON; 135 136 ifmsh->nonpeer_pm = nonpeer_pm; 137 ifmsh->ps_peers_light_sleep = light_sleep_cnt; 138 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; 139 140 return changed; 141 } 142 143 /** 144 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA 145 * 146 * @sta: mesh STA 147 * @pm: the power mode to set 148 * Return BSS_CHANGED_BEACON if a beacon update is in order. 149 */ 150 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 151 enum nl80211_mesh_power_mode pm) 152 { 153 struct ieee80211_sub_if_data *sdata = sta->sdata; 154 155 mps_dbg(sdata, "local STA operates in mode %d with %pM\n", 156 pm, sta->sta.addr); 157 158 sta->local_pm = pm; 159 160 /* 161 * announce peer-specific power mode transition 162 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3) 163 */ 164 if (sta->plink_state == NL80211_PLINK_ESTAB) 165 mps_qos_null_tx(sta); 166 167 return ieee80211_mps_local_status_update(sdata); 168 } 169 170 /** 171 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control) 172 * 173 * @sdata: local mesh subif 174 * @sta: mesh STA 175 * @hdr: 802.11 frame header 176 * 177 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11 178 * 179 * NOTE: sta must be given when an individually-addressed QoS frame header 180 * is handled, for group-addressed and management frames it is not used 181 */ 182 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 183 struct sta_info *sta, 184 struct ieee80211_hdr *hdr) 185 { 186 enum nl80211_mesh_power_mode pm; 187 u8 *qc; 188 189 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) && 190 ieee80211_is_data_qos(hdr->frame_control) && 191 !sta)) 192 return; 193 194 if (is_unicast_ether_addr(hdr->addr1) && 195 ieee80211_is_data_qos(hdr->frame_control) && 196 sta->plink_state == NL80211_PLINK_ESTAB) 197 pm = sta->local_pm; 198 else 199 pm = sdata->u.mesh.nonpeer_pm; 200 201 if (pm == NL80211_MESH_POWER_ACTIVE) 202 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM); 203 else 204 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); 205 206 if (!ieee80211_is_data_qos(hdr->frame_control)) 207 return; 208 209 qc = ieee80211_get_qos_ctl(hdr); 210 211 if ((is_unicast_ether_addr(hdr->addr1) && 212 pm == NL80211_MESH_POWER_DEEP_SLEEP) || 213 (is_multicast_ether_addr(hdr->addr1) && 214 sdata->u.mesh.ps_peers_deep_sleep > 0)) 215 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); 216 else 217 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); 218 } 219 220 /** 221 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA 222 * 223 * @sta: mesh STA 224 * 225 * called after change of peering status or non-peer/peer-specific power mode 226 */ 227 void ieee80211_mps_sta_status_update(struct sta_info *sta) 228 { 229 enum nl80211_mesh_power_mode pm; 230 bool do_buffer; 231 232 /* For non-assoc STA, prevent buffering or frame transmission */ 233 if (sta->sta_state < IEEE80211_STA_ASSOC) 234 return; 235 236 /* 237 * use peer-specific power mode if peering is established and the 238 * peer's power mode is known 239 */ 240 if (sta->plink_state == NL80211_PLINK_ESTAB && 241 sta->peer_pm != NL80211_MESH_POWER_UNKNOWN) 242 pm = sta->peer_pm; 243 else 244 pm = sta->nonpeer_pm; 245 246 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE); 247 248 /* Don't let the same PS state be set twice */ 249 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer) 250 return; 251 252 if (do_buffer) { 253 set_sta_flag(sta, WLAN_STA_PS_STA); 254 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps); 255 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n", 256 sta->sta.addr); 257 } else { 258 ieee80211_sta_ps_deliver_wakeup(sta); 259 } 260 261 /* clear the MPSP flags for non-peers or active STA */ 262 if (sta->plink_state != NL80211_PLINK_ESTAB) { 263 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 264 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 265 } else if (!do_buffer) { 266 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 267 } 268 } 269 270 static void mps_set_sta_peer_pm(struct sta_info *sta, 271 struct ieee80211_hdr *hdr) 272 { 273 enum nl80211_mesh_power_mode pm; 274 u8 *qc = ieee80211_get_qos_ctl(hdr); 275 276 /* 277 * Test Power Management field of frame control (PW) and 278 * mesh power save level subfield of QoS control field (PSL) 279 * 280 * | PM | PSL| Mesh PM | 281 * +----+----+---------+ 282 * | 0 |Rsrv| Active | 283 * | 1 | 0 | Light | 284 * | 1 | 1 | Deep | 285 */ 286 if (ieee80211_has_pm(hdr->frame_control)) { 287 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8)) 288 pm = NL80211_MESH_POWER_DEEP_SLEEP; 289 else 290 pm = NL80211_MESH_POWER_LIGHT_SLEEP; 291 } else { 292 pm = NL80211_MESH_POWER_ACTIVE; 293 } 294 295 if (sta->peer_pm == pm) 296 return; 297 298 mps_dbg(sta->sdata, "STA %pM enters mode %d\n", 299 sta->sta.addr, pm); 300 301 sta->peer_pm = pm; 302 303 ieee80211_mps_sta_status_update(sta); 304 } 305 306 static void mps_set_sta_nonpeer_pm(struct sta_info *sta, 307 struct ieee80211_hdr *hdr) 308 { 309 enum nl80211_mesh_power_mode pm; 310 311 if (ieee80211_has_pm(hdr->frame_control)) 312 pm = NL80211_MESH_POWER_DEEP_SLEEP; 313 else 314 pm = NL80211_MESH_POWER_ACTIVE; 315 316 if (sta->nonpeer_pm == pm) 317 return; 318 319 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n", 320 sta->sta.addr, pm); 321 322 sta->nonpeer_pm = pm; 323 324 ieee80211_mps_sta_status_update(sta); 325 } 326 327 /** 328 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave 329 * 330 * @sta: STA info that transmitted the frame 331 * @hdr: IEEE 802.11 (QoS) Header 332 */ 333 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 334 struct ieee80211_hdr *hdr) 335 { 336 if (is_unicast_ether_addr(hdr->addr1) && 337 ieee80211_is_data_qos(hdr->frame_control)) { 338 /* 339 * individually addressed QoS Data/Null frames contain 340 * peer link-specific PS mode towards the local STA 341 */ 342 mps_set_sta_peer_pm(sta, hdr); 343 344 /* check for mesh Peer Service Period trigger frames */ 345 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr), 346 sta, false, false); 347 } else { 348 /* 349 * can only determine non-peer PS mode 350 * (see IEEE802.11-2012 8.2.4.1.7) 351 */ 352 mps_set_sta_nonpeer_pm(sta, hdr); 353 } 354 } 355 356 357 /* mesh PS frame release */ 358 359 static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp) 360 { 361 struct ieee80211_sub_if_data *sdata = sta->sdata; 362 struct sk_buff *skb; 363 struct ieee80211_hdr *nullfunc; 364 struct ieee80211_tx_info *info; 365 u8 *qc; 366 367 skb = mps_qos_null_get(sta); 368 if (!skb) 369 return; 370 371 nullfunc = (struct ieee80211_hdr *) skb->data; 372 if (!eosp) 373 nullfunc->frame_control |= 374 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 375 /* 376 * | RSPI | EOSP | MPSP triggering | 377 * +------+------+--------------------+ 378 * | 0 | 0 | local STA is owner | 379 * | 0 | 1 | no MPSP (MPSP end) | 380 * | 1 | 0 | both STA are owner | 381 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2 382 */ 383 qc = ieee80211_get_qos_ctl(nullfunc); 384 if (rspi) 385 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8); 386 if (eosp) 387 qc[0] |= IEEE80211_QOS_CTL_EOSP; 388 389 info = IEEE80211_SKB_CB(skb); 390 391 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | 392 IEEE80211_TX_CTL_REQ_TX_STATUS; 393 394 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n", 395 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr); 396 397 ieee80211_tx_skb(sdata, skb); 398 } 399 400 /** 401 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed 402 * 403 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP 404 * flag in the QoS Control field. In case the current tailing frame is not a 405 * QoS Data frame, append a QoS Null to carry the flag. 406 */ 407 static void mpsp_qos_null_append(struct sta_info *sta, 408 struct sk_buff_head *frames) 409 { 410 struct ieee80211_sub_if_data *sdata = sta->sdata; 411 struct sk_buff *new_skb, *skb = skb_peek_tail(frames); 412 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 413 struct ieee80211_tx_info *info; 414 415 if (ieee80211_is_data_qos(hdr->frame_control)) 416 return; 417 418 new_skb = mps_qos_null_get(sta); 419 if (!new_skb) 420 return; 421 422 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n", 423 sta->sta.addr); 424 /* 425 * This frame has to be transmitted last. Assign lowest priority to 426 * make sure it cannot pass other frames when releasing multiple ACs. 427 */ 428 new_skb->priority = 1; 429 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK); 430 ieee80211_set_qos_hdr(sdata, new_skb); 431 432 info = IEEE80211_SKB_CB(new_skb); 433 info->control.vif = &sdata->vif; 434 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 435 436 __skb_queue_tail(frames, new_skb); 437 } 438 439 /** 440 * mps_frame_deliver - transmit frames during mesh powersave 441 * 442 * @sta: STA info to transmit to 443 * @n_frames: number of frames to transmit. -1 for all 444 */ 445 static void mps_frame_deliver(struct sta_info *sta, int n_frames) 446 { 447 struct ieee80211_sub_if_data *sdata = sta->sdata; 448 struct ieee80211_local *local = sdata->local; 449 int ac; 450 struct sk_buff_head frames; 451 struct sk_buff *skb; 452 bool more_data = false; 453 454 skb_queue_head_init(&frames); 455 456 /* collect frame(s) from buffers */ 457 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 458 while (n_frames != 0) { 459 skb = skb_dequeue(&sta->tx_filtered[ac]); 460 if (!skb) { 461 skb = skb_dequeue( 462 &sta->ps_tx_buf[ac]); 463 if (skb) 464 local->total_ps_buffered--; 465 } 466 if (!skb) 467 break; 468 n_frames--; 469 __skb_queue_tail(&frames, skb); 470 } 471 472 if (!skb_queue_empty(&sta->tx_filtered[ac]) || 473 !skb_queue_empty(&sta->ps_tx_buf[ac])) 474 more_data = true; 475 } 476 477 /* nothing to send? -> EOSP */ 478 if (skb_queue_empty(&frames)) { 479 mpsp_trigger_send(sta, false, true); 480 return; 481 } 482 483 /* in a MPSP make sure the last skb is a QoS Data frame */ 484 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 485 mpsp_qos_null_append(sta, &frames); 486 487 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n", 488 skb_queue_len(&frames), sta->sta.addr); 489 490 /* prepare collected frames for transmission */ 491 skb_queue_walk(&frames, skb) { 492 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 493 struct ieee80211_hdr *hdr = (void *) skb->data; 494 495 /* 496 * Tell TX path to send this frame even though the 497 * STA may still remain is PS mode after this frame 498 * exchange. 499 */ 500 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 501 502 if (more_data || !skb_queue_is_last(&frames, skb)) 503 hdr->frame_control |= 504 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 505 else 506 hdr->frame_control &= 507 cpu_to_le16(~IEEE80211_FCTL_MOREDATA); 508 509 if (skb_queue_is_last(&frames, skb) && 510 ieee80211_is_data_qos(hdr->frame_control)) { 511 u8 *qoshdr = ieee80211_get_qos_ctl(hdr); 512 513 /* MPSP trigger frame ends service period */ 514 *qoshdr |= IEEE80211_QOS_CTL_EOSP; 515 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 516 } 517 } 518 519 ieee80211_add_pending_skbs(local, &frames); 520 sta_info_recalc_tim(sta); 521 } 522 523 /** 524 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods 525 * 526 * @qc: QoS Control field 527 * @sta: peer to start a MPSP with 528 * @tx: frame was transmitted by the local STA 529 * @acked: frame has been transmitted successfully 530 * 531 * NOTE: active mode STA may only serve as MPSP owner 532 */ 533 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 534 bool tx, bool acked) 535 { 536 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8); 537 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP; 538 539 if (tx) { 540 if (rspi && acked) 541 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 542 543 if (eosp) 544 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); 545 else if (acked && 546 test_sta_flag(sta, WLAN_STA_PS_STA) && 547 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 548 mps_frame_deliver(sta, -1); 549 } else { 550 if (eosp) 551 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 552 else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE) 553 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); 554 555 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) 556 mps_frame_deliver(sta, -1); 557 } 558 } 559 560 /** 561 * ieee80211_mps_frame_release - release buffered frames in response to beacon 562 * 563 * @sta: mesh STA 564 * @elems: beacon IEs 565 * 566 * For peers if we have individually-addressed frames buffered or the peer 567 * indicates buffered frames, send a corresponding MPSP trigger frame. Since 568 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP 569 * trigger frames. If the neighbour STA is not a peer, only send single frames. 570 */ 571 void ieee80211_mps_frame_release(struct sta_info *sta, 572 struct ieee802_11_elems *elems) 573 { 574 int ac, buffer_local = 0; 575 bool has_buffered = false; 576 577 /* TIM map only for LLID <= IEEE80211_MAX_AID */ 578 if (sta->plink_state == NL80211_PLINK_ESTAB) 579 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len, 580 le16_to_cpu(sta->llid) % IEEE80211_MAX_AID); 581 582 if (has_buffered) 583 mps_dbg(sta->sdata, "%pM indicates buffered frames\n", 584 sta->sta.addr); 585 586 /* only transmit to PS STA with announced, non-zero awake window */ 587 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 588 (!elems->awake_window || !le16_to_cpu(*elems->awake_window))) 589 return; 590 591 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 592 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) + 593 skb_queue_len(&sta->tx_filtered[ac]); 594 595 if (!has_buffered && !buffer_local) 596 return; 597 598 if (sta->plink_state == NL80211_PLINK_ESTAB) 599 mpsp_trigger_send(sta, has_buffered, !buffer_local); 600 else 601 mps_frame_deliver(sta, 1); 602 } 603