1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <net/codel.h> 28 #include <net/codel_impl.h> 29 #include <asm/unaligned.h> 30 #include <net/fq_impl.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 44 { 45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 46 47 u64_stats_update_begin(&tstats->syncp); 48 tstats->tx_packets++; 49 tstats->tx_bytes += len; 50 u64_stats_update_end(&tstats->syncp); 51 } 52 53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 54 struct sk_buff *skb, int group_addr, 55 int next_frag_len) 56 { 57 int rate, mrate, erp, dur, i, shift = 0; 58 struct ieee80211_rate *txrate; 59 struct ieee80211_local *local = tx->local; 60 struct ieee80211_supported_band *sband; 61 struct ieee80211_hdr *hdr; 62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 63 struct ieee80211_chanctx_conf *chanctx_conf; 64 u32 rate_flags = 0; 65 66 rcu_read_lock(); 67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 68 if (chanctx_conf) { 69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 71 } 72 rcu_read_unlock(); 73 74 /* assume HW handles this */ 75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 76 return 0; 77 78 /* uh huh? */ 79 if (WARN_ON_ONCE(tx->rate.idx < 0)) 80 return 0; 81 82 sband = local->hw.wiphy->bands[info->band]; 83 txrate = &sband->bitrates[tx->rate.idx]; 84 85 erp = txrate->flags & IEEE80211_RATE_ERP_G; 86 87 /* 88 * data and mgmt (except PS Poll): 89 * - during CFP: 32768 90 * - during contention period: 91 * if addr1 is group address: 0 92 * if more fragments = 0 and addr1 is individual address: time to 93 * transmit one ACK plus SIFS 94 * if more fragments = 1 and addr1 is individual address: time to 95 * transmit next fragment plus 2 x ACK plus 3 x SIFS 96 * 97 * IEEE 802.11, 9.6: 98 * - control response frame (CTS or ACK) shall be transmitted using the 99 * same rate as the immediately previous frame in the frame exchange 100 * sequence, if this rate belongs to the PHY mandatory rates, or else 101 * at the highest possible rate belonging to the PHY rates in the 102 * BSSBasicRateSet 103 */ 104 hdr = (struct ieee80211_hdr *)skb->data; 105 if (ieee80211_is_ctl(hdr->frame_control)) { 106 /* TODO: These control frames are not currently sent by 107 * mac80211, but should they be implemented, this function 108 * needs to be updated to support duration field calculation. 109 * 110 * RTS: time needed to transmit pending data/mgmt frame plus 111 * one CTS frame plus one ACK frame plus 3 x SIFS 112 * CTS: duration of immediately previous RTS minus time 113 * required to transmit CTS and its SIFS 114 * ACK: 0 if immediately previous directed data/mgmt had 115 * more=0, with more=1 duration in ACK frame is duration 116 * from previous frame minus time needed to transmit ACK 117 * and its SIFS 118 * PS Poll: BIT(15) | BIT(14) | aid 119 */ 120 return 0; 121 } 122 123 /* data/mgmt */ 124 if (0 /* FIX: data/mgmt during CFP */) 125 return cpu_to_le16(32768); 126 127 if (group_addr) /* Group address as the destination - no ACK */ 128 return 0; 129 130 /* Individual destination address: 131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 132 * CTS and ACK frames shall be transmitted using the highest rate in 133 * basic rate set that is less than or equal to the rate of the 134 * immediately previous frame and that is using the same modulation 135 * (CCK or OFDM). If no basic rate set matches with these requirements, 136 * the highest mandatory rate of the PHY that is less than or equal to 137 * the rate of the previous frame is used. 138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 139 */ 140 rate = -1; 141 /* use lowest available if everything fails */ 142 mrate = sband->bitrates[0].bitrate; 143 for (i = 0; i < sband->n_bitrates; i++) { 144 struct ieee80211_rate *r = &sband->bitrates[i]; 145 146 if (r->bitrate > txrate->bitrate) 147 break; 148 149 if ((rate_flags & r->flags) != rate_flags) 150 continue; 151 152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 154 155 switch (sband->band) { 156 case NL80211_BAND_2GHZ: { 157 u32 flag; 158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 159 flag = IEEE80211_RATE_MANDATORY_G; 160 else 161 flag = IEEE80211_RATE_MANDATORY_B; 162 if (r->flags & flag) 163 mrate = r->bitrate; 164 break; 165 } 166 case NL80211_BAND_5GHZ: 167 if (r->flags & IEEE80211_RATE_MANDATORY_A) 168 mrate = r->bitrate; 169 break; 170 case NL80211_BAND_60GHZ: 171 /* TODO, for now fall through */ 172 case NUM_NL80211_BANDS: 173 WARN_ON(1); 174 break; 175 } 176 } 177 if (rate == -1) { 178 /* No matching basic rate found; use highest suitable mandatory 179 * PHY rate */ 180 rate = DIV_ROUND_UP(mrate, 1 << shift); 181 } 182 183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 184 if (ieee80211_is_data_qos(hdr->frame_control) && 185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 186 dur = 0; 187 else 188 /* Time needed to transmit ACK 189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 190 * to closest integer */ 191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble, 193 shift); 194 195 if (next_frag_len) { 196 /* Frame is fragmented: duration increases with time needed to 197 * transmit next fragment plus ACK and 2 x SIFS. */ 198 dur *= 2; /* ACK + SIFS */ 199 /* next fragment */ 200 dur += ieee80211_frame_duration(sband->band, next_frag_len, 201 txrate->bitrate, erp, 202 tx->sdata->vif.bss_conf.use_short_preamble, 203 shift); 204 } 205 206 return cpu_to_le16(dur); 207 } 208 209 /* tx handlers */ 210 static ieee80211_tx_result debug_noinline 211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 212 { 213 struct ieee80211_local *local = tx->local; 214 struct ieee80211_if_managed *ifmgd; 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 335 ieee80211_is_data(hdr->frame_control) && 336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 ieee80211_free_txskb(&local->hw, skb); 372 } 373 total += skb_queue_len(&ps->bc_buf); 374 } 375 376 /* 377 * Drop one frame from each station from the lowest-priority 378 * AC that has frames at all. 379 */ 380 list_for_each_entry_rcu(sta, &local->sta_list, list) { 381 int ac; 382 383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 384 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 385 total += skb_queue_len(&sta->ps_tx_buf[ac]); 386 if (skb) { 387 purged++; 388 ieee80211_free_txskb(&local->hw, skb); 389 break; 390 } 391 } 392 } 393 394 local->total_ps_buffered = total; 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 396 } 397 398 static ieee80211_tx_result 399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 400 { 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 403 struct ps_data *ps; 404 405 /* 406 * broadcast/multicast frame 407 * 408 * If any of the associated/peer stations is in power save mode, 409 * the frame is buffered to be sent after DTIM beacon frame. 410 * This is done either by the hardware or us. 411 */ 412 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 416 if (!tx->sdata->bss) 417 return TX_CONTINUE; 418 419 ps = &tx->sdata->bss->ps; 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 421 ps = &tx->sdata->u.mesh.ps; 422 } else { 423 return TX_CONTINUE; 424 } 425 426 427 /* no buffering for ordered frames */ 428 if (ieee80211_has_order(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_is_probe_req(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 435 info->hw_queue = tx->sdata->vif.cab_queue; 436 437 /* no stations in PS mode */ 438 if (!atomic_read(&ps->num_sta_ps)) 439 return TX_CONTINUE; 440 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 442 443 /* device releases frame after DTIM beacon */ 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 445 return TX_CONTINUE; 446 447 /* buffered in mac80211 */ 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 449 purge_old_ps_buffers(tx->local); 450 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 452 ps_dbg(tx->sdata, 453 "BC TX buffer full - dropping the oldest frame\n"); 454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 455 } else 456 tx->local->total_ps_buffered++; 457 458 skb_queue_tail(&ps->bc_buf, tx->skb); 459 460 return TX_QUEUED; 461 } 462 463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 464 struct sk_buff *skb) 465 { 466 if (!ieee80211_is_mgmt(fc)) 467 return 0; 468 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 470 return 0; 471 472 if (!ieee80211_is_robust_mgmt_frame(skb)) 473 return 0; 474 475 return 1; 476 } 477 478 static ieee80211_tx_result 479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 480 { 481 struct sta_info *sta = tx->sta; 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 484 struct ieee80211_local *local = tx->local; 485 486 if (unlikely(!sta)) 487 return TX_CONTINUE; 488 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 493 int ac = skb_get_queue_mapping(tx->skb); 494 495 if (ieee80211_is_mgmt(hdr->frame_control) && 496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 498 return TX_CONTINUE; 499 } 500 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 502 sta->sta.addr, sta->sta.aid, ac); 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 504 purge_old_ps_buffers(tx->local); 505 506 /* sync with ieee80211_sta_ps_deliver_wakeup */ 507 spin_lock(&sta->ps_lock); 508 /* 509 * STA woke up the meantime and all the frames on ps_tx_buf have 510 * been queued to pending queue. No reordering can happen, go 511 * ahead and Tx the packet. 512 */ 513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 516 spin_unlock(&sta->ps_lock); 517 return TX_CONTINUE; 518 } 519 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 522 ps_dbg(tx->sdata, 523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 524 sta->sta.addr, ac); 525 ieee80211_free_txskb(&local->hw, old); 526 } else 527 tx->local->total_ps_buffered++; 528 529 info->control.jiffies = jiffies; 530 info->control.vif = &tx->sdata->vif; 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 534 spin_unlock(&sta->ps_lock); 535 536 if (!timer_pending(&local->sta_cleanup)) 537 mod_timer(&local->sta_cleanup, 538 round_jiffies(jiffies + 539 STA_INFO_CLEANUP_INTERVAL)); 540 541 /* 542 * We queued up some frames, so the TIM bit might 543 * need to be set, recalculate it. 544 */ 545 sta_info_recalc_tim(sta); 546 547 return TX_QUEUED; 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 549 ps_dbg(tx->sdata, 550 "STA %pM in PS mode, but polling/in SP -> send frame\n", 551 sta->sta.addr); 552 } 553 554 return TX_CONTINUE; 555 } 556 557 static ieee80211_tx_result debug_noinline 558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 559 { 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 561 return TX_CONTINUE; 562 563 if (tx->flags & IEEE80211_TX_UNICAST) 564 return ieee80211_tx_h_unicast_ps_buf(tx); 565 else 566 return ieee80211_tx_h_multicast_ps_buf(tx); 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 575 if (tx->sdata->control_port_no_encrypt) 576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 579 } 580 581 return TX_CONTINUE; 582 } 583 584 static ieee80211_tx_result debug_noinline 585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 586 { 587 struct ieee80211_key *key; 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 590 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 592 tx->key = NULL; 593 else if (tx->sta && 594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 595 tx->key = key; 596 else if (ieee80211_is_group_privacy_action(tx->skb) && 597 (key = rcu_dereference(tx->sdata->default_multicast_key))) 598 tx->key = key; 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 603 tx->key = key; 604 else if (is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_multicast_key))) 606 tx->key = key; 607 else if (!is_multicast_ether_addr(hdr->addr1) && 608 (key = rcu_dereference(tx->sdata->default_unicast_key))) 609 tx->key = key; 610 else 611 tx->key = NULL; 612 613 if (tx->key) { 614 bool skip_hw = false; 615 616 /* TODO: add threshold stuff again */ 617 618 switch (tx->key->conf.cipher) { 619 case WLAN_CIPHER_SUITE_WEP40: 620 case WLAN_CIPHER_SUITE_WEP104: 621 case WLAN_CIPHER_SUITE_TKIP: 622 if (!ieee80211_is_data_present(hdr->frame_control)) 623 tx->key = NULL; 624 break; 625 case WLAN_CIPHER_SUITE_CCMP: 626 case WLAN_CIPHER_SUITE_CCMP_256: 627 case WLAN_CIPHER_SUITE_GCMP: 628 case WLAN_CIPHER_SUITE_GCMP_256: 629 if (!ieee80211_is_data_present(hdr->frame_control) && 630 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 631 tx->skb) && 632 !ieee80211_is_group_privacy_action(tx->skb)) 633 tx->key = NULL; 634 else 635 skip_hw = (tx->key->conf.flags & 636 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 637 ieee80211_is_mgmt(hdr->frame_control); 638 break; 639 case WLAN_CIPHER_SUITE_AES_CMAC: 640 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 643 if (!ieee80211_is_mgmt(hdr->frame_control)) 644 tx->key = NULL; 645 break; 646 } 647 648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 649 !ieee80211_is_deauth(hdr->frame_control))) 650 return TX_DROP; 651 652 if (!skip_hw && tx->key && 653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 654 info->control.hw_key = &tx->key->conf; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 686 txrc.max_rate_idx = -1; 687 else 688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 689 690 if (tx->sdata->rc_has_mcs_mask[info->band]) 691 txrc.rate_idx_mcs_mask = 692 tx->sdata->rc_rateidx_mcs_mask[info->band]; 693 694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 697 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 698 699 /* set up RTS protection if desired */ 700 if (len > tx->local->hw.wiphy->rts_threshold) { 701 txrc.rts = true; 702 } 703 704 info->control.use_rts = txrc.rts; 705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 706 707 /* 708 * Use short preamble if the BSS can handle it, but not for 709 * management frames unless we know the receiver can handle 710 * that -- the management frame might be to a station that 711 * just wants a probe response. 712 */ 713 if (tx->sdata->vif.bss_conf.use_short_preamble && 714 (ieee80211_is_data(hdr->frame_control) || 715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 716 txrc.short_preamble = true; 717 718 info->control.short_preamble = txrc.short_preamble; 719 720 /* don't ask rate control when rate already injected via radiotap */ 721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 722 return TX_CONTINUE; 723 724 if (tx->sta) 725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 726 727 /* 728 * Lets not bother rate control if we're associated and cannot 729 * talk to the sta. This should not happen. 730 */ 731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 732 !rate_usable_index_exists(sband, &tx->sta->sta), 733 "%s: Dropped data frame as no usable bitrate found while " 734 "scanning and associated. Target station: " 735 "%pM on %d GHz band\n", 736 tx->sdata->name, hdr->addr1, 737 info->band ? 5 : 2)) 738 return TX_DROP; 739 740 /* 741 * If we're associated with the sta at this point we know we can at 742 * least send the frame at the lowest bit rate. 743 */ 744 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 745 746 if (tx->sta && !info->control.skip_table) 747 ratetbl = rcu_dereference(tx->sta->sta.rates); 748 749 if (unlikely(info->control.rates[0].idx < 0)) { 750 if (ratetbl) { 751 struct ieee80211_tx_rate rate = { 752 .idx = ratetbl->rate[0].idx, 753 .flags = ratetbl->rate[0].flags, 754 .count = ratetbl->rate[0].count 755 }; 756 757 if (ratetbl->rate[0].idx < 0) 758 return TX_DROP; 759 760 tx->rate = rate; 761 } else { 762 return TX_DROP; 763 } 764 } else { 765 tx->rate = info->control.rates[0]; 766 } 767 768 if (txrc.reported_rate.idx < 0) { 769 txrc.reported_rate = tx->rate; 770 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 } else if (tx->sta) 773 tx->sta->tx_stats.last_rate = txrc.reported_rate; 774 775 if (ratetbl) 776 return TX_CONTINUE; 777 778 if (unlikely(!info->control.rates[0].count)) 779 info->control.rates[0].count = 1; 780 781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 782 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 783 info->control.rates[0].count = 1; 784 785 return TX_CONTINUE; 786 } 787 788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 789 { 790 u16 *seq = &sta->tid_seq[tid]; 791 __le16 ret = cpu_to_le16(*seq); 792 793 /* Increase the sequence number. */ 794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 795 796 return ret; 797 } 798 799 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 800 struct ieee80211_vif *vif, 801 struct ieee80211_sta *pubsta, 802 struct sk_buff *skb) 803 { 804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 805 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 806 struct ieee80211_txq *txq = NULL; 807 808 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 809 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 810 return NULL; 811 812 if (!ieee80211_is_data(hdr->frame_control)) 813 return NULL; 814 815 if (pubsta) { 816 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 817 818 txq = pubsta->txq[tid]; 819 } else if (vif) { 820 txq = vif->txq; 821 } 822 823 if (!txq) 824 return NULL; 825 826 return to_txq_info(txq); 827 } 828 829 static ieee80211_tx_result debug_noinline 830 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 831 { 832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 834 u8 *qc; 835 int tid; 836 837 /* 838 * Packet injection may want to control the sequence 839 * number, if we have no matching interface then we 840 * neither assign one ourselves nor ask the driver to. 841 */ 842 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 843 return TX_CONTINUE; 844 845 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 846 return TX_CONTINUE; 847 848 if (ieee80211_hdrlen(hdr->frame_control) < 24) 849 return TX_CONTINUE; 850 851 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 852 return TX_CONTINUE; 853 854 /* 855 * Anything but QoS data that has a sequence number field 856 * (is long enough) gets a sequence number from the global 857 * counter. QoS data frames with a multicast destination 858 * also use the global counter (802.11-2012 9.3.2.10). 859 */ 860 if (!ieee80211_is_data_qos(hdr->frame_control) || 861 is_multicast_ether_addr(hdr->addr1)) { 862 /* driver should assign sequence number */ 863 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 864 /* for pure STA mode without beacons, we can do it */ 865 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 866 tx->sdata->sequence_number += 0x10; 867 if (tx->sta) 868 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 869 return TX_CONTINUE; 870 } 871 872 /* 873 * This should be true for injected/management frames only, for 874 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 875 * above since they are not QoS-data frames. 876 */ 877 if (!tx->sta) 878 return TX_CONTINUE; 879 880 /* include per-STA, per-TID sequence counter */ 881 882 qc = ieee80211_get_qos_ctl(hdr); 883 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 884 tx->sta->tx_stats.msdu[tid]++; 885 886 if (!ieee80211_get_txq(tx->local, info->control.vif, &tx->sta->sta, 887 tx->skb)) 888 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 889 890 return TX_CONTINUE; 891 } 892 893 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 894 struct sk_buff *skb, int hdrlen, 895 int frag_threshold) 896 { 897 struct ieee80211_local *local = tx->local; 898 struct ieee80211_tx_info *info; 899 struct sk_buff *tmp; 900 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 901 int pos = hdrlen + per_fragm; 902 int rem = skb->len - hdrlen - per_fragm; 903 904 if (WARN_ON(rem < 0)) 905 return -EINVAL; 906 907 /* first fragment was already added to queue by caller */ 908 909 while (rem) { 910 int fraglen = per_fragm; 911 912 if (fraglen > rem) 913 fraglen = rem; 914 rem -= fraglen; 915 tmp = dev_alloc_skb(local->tx_headroom + 916 frag_threshold + 917 tx->sdata->encrypt_headroom + 918 IEEE80211_ENCRYPT_TAILROOM); 919 if (!tmp) 920 return -ENOMEM; 921 922 __skb_queue_tail(&tx->skbs, tmp); 923 924 skb_reserve(tmp, 925 local->tx_headroom + tx->sdata->encrypt_headroom); 926 927 /* copy control information */ 928 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 929 930 info = IEEE80211_SKB_CB(tmp); 931 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 932 IEEE80211_TX_CTL_FIRST_FRAGMENT); 933 934 if (rem) 935 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 936 937 skb_copy_queue_mapping(tmp, skb); 938 tmp->priority = skb->priority; 939 tmp->dev = skb->dev; 940 941 /* copy header and data */ 942 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 943 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 944 945 pos += fraglen; 946 } 947 948 /* adjust first fragment's length */ 949 skb_trim(skb, hdrlen + per_fragm); 950 return 0; 951 } 952 953 static ieee80211_tx_result debug_noinline 954 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 955 { 956 struct sk_buff *skb = tx->skb; 957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 958 struct ieee80211_hdr *hdr = (void *)skb->data; 959 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 960 int hdrlen; 961 int fragnum; 962 963 /* no matter what happens, tx->skb moves to tx->skbs */ 964 __skb_queue_tail(&tx->skbs, skb); 965 tx->skb = NULL; 966 967 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 968 return TX_CONTINUE; 969 970 if (tx->local->ops->set_frag_threshold) 971 return TX_CONTINUE; 972 973 /* 974 * Warn when submitting a fragmented A-MPDU frame and drop it. 975 * This scenario is handled in ieee80211_tx_prepare but extra 976 * caution taken here as fragmented ampdu may cause Tx stop. 977 */ 978 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 979 return TX_DROP; 980 981 hdrlen = ieee80211_hdrlen(hdr->frame_control); 982 983 /* internal error, why isn't DONTFRAG set? */ 984 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 985 return TX_DROP; 986 987 /* 988 * Now fragment the frame. This will allocate all the fragments and 989 * chain them (using skb as the first fragment) to skb->next. 990 * During transmission, we will remove the successfully transmitted 991 * fragments from this list. When the low-level driver rejects one 992 * of the fragments then we will simply pretend to accept the skb 993 * but store it away as pending. 994 */ 995 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 996 return TX_DROP; 997 998 /* update duration/seq/flags of fragments */ 999 fragnum = 0; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1003 1004 hdr = (void *)skb->data; 1005 info = IEEE80211_SKB_CB(skb); 1006 1007 if (!skb_queue_is_last(&tx->skbs, skb)) { 1008 hdr->frame_control |= morefrags; 1009 /* 1010 * No multi-rate retries for fragmented frames, that 1011 * would completely throw off the NAV at other STAs. 1012 */ 1013 info->control.rates[1].idx = -1; 1014 info->control.rates[2].idx = -1; 1015 info->control.rates[3].idx = -1; 1016 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1017 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1018 } else { 1019 hdr->frame_control &= ~morefrags; 1020 } 1021 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1022 fragnum++; 1023 } 1024 1025 return TX_CONTINUE; 1026 } 1027 1028 static ieee80211_tx_result debug_noinline 1029 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1030 { 1031 struct sk_buff *skb; 1032 int ac = -1; 1033 1034 if (!tx->sta) 1035 return TX_CONTINUE; 1036 1037 skb_queue_walk(&tx->skbs, skb) { 1038 ac = skb_get_queue_mapping(skb); 1039 tx->sta->tx_stats.bytes[ac] += skb->len; 1040 } 1041 if (ac >= 0) 1042 tx->sta->tx_stats.packets[ac]++; 1043 1044 return TX_CONTINUE; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1049 { 1050 if (!tx->key) 1051 return TX_CONTINUE; 1052 1053 switch (tx->key->conf.cipher) { 1054 case WLAN_CIPHER_SUITE_WEP40: 1055 case WLAN_CIPHER_SUITE_WEP104: 1056 return ieee80211_crypto_wep_encrypt(tx); 1057 case WLAN_CIPHER_SUITE_TKIP: 1058 return ieee80211_crypto_tkip_encrypt(tx); 1059 case WLAN_CIPHER_SUITE_CCMP: 1060 return ieee80211_crypto_ccmp_encrypt( 1061 tx, IEEE80211_CCMP_MIC_LEN); 1062 case WLAN_CIPHER_SUITE_CCMP_256: 1063 return ieee80211_crypto_ccmp_encrypt( 1064 tx, IEEE80211_CCMP_256_MIC_LEN); 1065 case WLAN_CIPHER_SUITE_AES_CMAC: 1066 return ieee80211_crypto_aes_cmac_encrypt(tx); 1067 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1068 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1069 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1070 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1071 return ieee80211_crypto_aes_gmac_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_GCMP: 1073 case WLAN_CIPHER_SUITE_GCMP_256: 1074 return ieee80211_crypto_gcmp_encrypt(tx); 1075 default: 1076 return ieee80211_crypto_hw_encrypt(tx); 1077 } 1078 1079 return TX_DROP; 1080 } 1081 1082 static ieee80211_tx_result debug_noinline 1083 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1084 { 1085 struct sk_buff *skb; 1086 struct ieee80211_hdr *hdr; 1087 int next_len; 1088 bool group_addr; 1089 1090 skb_queue_walk(&tx->skbs, skb) { 1091 hdr = (void *) skb->data; 1092 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1093 break; /* must not overwrite AID */ 1094 if (!skb_queue_is_last(&tx->skbs, skb)) { 1095 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1096 next_len = next->len; 1097 } else 1098 next_len = 0; 1099 group_addr = is_multicast_ether_addr(hdr->addr1); 1100 1101 hdr->duration_id = 1102 ieee80211_duration(tx, skb, group_addr, next_len); 1103 } 1104 1105 return TX_CONTINUE; 1106 } 1107 1108 /* actual transmit path */ 1109 1110 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1111 struct sk_buff *skb, 1112 struct ieee80211_tx_info *info, 1113 struct tid_ampdu_tx *tid_tx, 1114 int tid) 1115 { 1116 bool queued = false; 1117 bool reset_agg_timer = false; 1118 struct sk_buff *purge_skb = NULL; 1119 1120 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1121 info->flags |= IEEE80211_TX_CTL_AMPDU; 1122 reset_agg_timer = true; 1123 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1124 /* 1125 * nothing -- this aggregation session is being started 1126 * but that might still fail with the driver 1127 */ 1128 } else if (!tx->sta->sta.txq[tid]) { 1129 spin_lock(&tx->sta->lock); 1130 /* 1131 * Need to re-check now, because we may get here 1132 * 1133 * 1) in the window during which the setup is actually 1134 * already done, but not marked yet because not all 1135 * packets are spliced over to the driver pending 1136 * queue yet -- if this happened we acquire the lock 1137 * either before or after the splice happens, but 1138 * need to recheck which of these cases happened. 1139 * 1140 * 2) during session teardown, if the OPERATIONAL bit 1141 * was cleared due to the teardown but the pointer 1142 * hasn't been assigned NULL yet (or we loaded it 1143 * before it was assigned) -- in this case it may 1144 * now be NULL which means we should just let the 1145 * packet pass through because splicing the frames 1146 * back is already done. 1147 */ 1148 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1149 1150 if (!tid_tx) { 1151 /* do nothing, let packet pass through */ 1152 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1153 info->flags |= IEEE80211_TX_CTL_AMPDU; 1154 reset_agg_timer = true; 1155 } else { 1156 queued = true; 1157 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1158 clear_sta_flag(tx->sta, WLAN_STA_SP); 1159 ps_dbg(tx->sta->sdata, 1160 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1161 tx->sta->sta.addr, tx->sta->sta.aid); 1162 } 1163 info->control.vif = &tx->sdata->vif; 1164 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1165 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1166 __skb_queue_tail(&tid_tx->pending, skb); 1167 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1168 purge_skb = __skb_dequeue(&tid_tx->pending); 1169 } 1170 spin_unlock(&tx->sta->lock); 1171 1172 if (purge_skb) 1173 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1174 } 1175 1176 /* reset session timer */ 1177 if (reset_agg_timer && tid_tx->timeout) 1178 tid_tx->last_tx = jiffies; 1179 1180 return queued; 1181 } 1182 1183 /* 1184 * initialises @tx 1185 * pass %NULL for the station if unknown, a valid pointer if known 1186 * or an ERR_PTR() if the station is known not to exist 1187 */ 1188 static ieee80211_tx_result 1189 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1190 struct ieee80211_tx_data *tx, 1191 struct sta_info *sta, struct sk_buff *skb) 1192 { 1193 struct ieee80211_local *local = sdata->local; 1194 struct ieee80211_hdr *hdr; 1195 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1196 int tid; 1197 u8 *qc; 1198 1199 memset(tx, 0, sizeof(*tx)); 1200 tx->skb = skb; 1201 tx->local = local; 1202 tx->sdata = sdata; 1203 __skb_queue_head_init(&tx->skbs); 1204 1205 /* 1206 * If this flag is set to true anywhere, and we get here, 1207 * we are doing the needed processing, so remove the flag 1208 * now. 1209 */ 1210 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1211 1212 hdr = (struct ieee80211_hdr *) skb->data; 1213 1214 if (likely(sta)) { 1215 if (!IS_ERR(sta)) 1216 tx->sta = sta; 1217 } else { 1218 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1219 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1220 if (!tx->sta && sdata->wdev.use_4addr) 1221 return TX_DROP; 1222 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1223 IEEE80211_TX_CTL_INJECTED) || 1224 tx->sdata->control_port_protocol == tx->skb->protocol) { 1225 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1226 } 1227 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1228 tx->sta = sta_info_get(sdata, hdr->addr1); 1229 } 1230 1231 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1232 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1233 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1234 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1235 struct tid_ampdu_tx *tid_tx; 1236 1237 qc = ieee80211_get_qos_ctl(hdr); 1238 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1239 1240 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1241 if (tid_tx) { 1242 bool queued; 1243 1244 queued = ieee80211_tx_prep_agg(tx, skb, info, 1245 tid_tx, tid); 1246 1247 if (unlikely(queued)) 1248 return TX_QUEUED; 1249 } 1250 } 1251 1252 if (is_multicast_ether_addr(hdr->addr1)) { 1253 tx->flags &= ~IEEE80211_TX_UNICAST; 1254 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1255 } else 1256 tx->flags |= IEEE80211_TX_UNICAST; 1257 1258 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1259 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1260 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1261 info->flags & IEEE80211_TX_CTL_AMPDU) 1262 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1263 } 1264 1265 if (!tx->sta) 1266 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1267 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1268 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1269 ieee80211_check_fast_xmit(tx->sta); 1270 } 1271 1272 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1273 1274 return TX_CONTINUE; 1275 } 1276 1277 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1278 { 1279 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1280 } 1281 1282 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi) 1283 { 1284 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif; 1285 } 1286 1287 static u32 codel_skb_len_func(const struct sk_buff *skb) 1288 { 1289 return skb->len; 1290 } 1291 1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1293 { 1294 const struct ieee80211_tx_info *info; 1295 1296 info = (const struct ieee80211_tx_info *)skb->cb; 1297 return info->control.enqueue_time; 1298 } 1299 1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1301 void *ctx) 1302 { 1303 struct ieee80211_local *local; 1304 struct txq_info *txqi; 1305 struct fq *fq; 1306 struct fq_flow *flow; 1307 1308 txqi = ctx; 1309 local = vif_to_sdata(txqi->txq.vif)->local; 1310 fq = &local->fq; 1311 1312 if (cvars == &txqi->def_cvars) 1313 flow = &txqi->def_flow; 1314 else 1315 flow = &fq->flows[cvars - local->cvars]; 1316 1317 return fq_flow_dequeue(fq, flow); 1318 } 1319 1320 static void codel_drop_func(struct sk_buff *skb, 1321 void *ctx) 1322 { 1323 struct ieee80211_local *local; 1324 struct ieee80211_hw *hw; 1325 struct txq_info *txqi; 1326 1327 txqi = ctx; 1328 local = vif_to_sdata(txqi->txq.vif)->local; 1329 hw = &local->hw; 1330 1331 ieee80211_free_txskb(hw, skb); 1332 } 1333 1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1335 struct fq_tin *tin, 1336 struct fq_flow *flow) 1337 { 1338 struct ieee80211_local *local; 1339 struct txq_info *txqi; 1340 struct codel_vars *cvars; 1341 struct codel_params *cparams; 1342 struct codel_stats *cstats; 1343 1344 local = container_of(fq, struct ieee80211_local, fq); 1345 txqi = container_of(tin, struct txq_info, tin); 1346 cparams = &local->cparams; 1347 cstats = &local->cstats; 1348 1349 if (flow == &txqi->def_flow) 1350 cvars = &txqi->def_cvars; 1351 else 1352 cvars = &local->cvars[flow - fq->flows]; 1353 1354 return codel_dequeue(txqi, 1355 &flow->backlog, 1356 cparams, 1357 cvars, 1358 cstats, 1359 codel_skb_len_func, 1360 codel_skb_time_func, 1361 codel_drop_func, 1362 codel_dequeue_func); 1363 } 1364 1365 static void fq_skb_free_func(struct fq *fq, 1366 struct fq_tin *tin, 1367 struct fq_flow *flow, 1368 struct sk_buff *skb) 1369 { 1370 struct ieee80211_local *local; 1371 1372 local = container_of(fq, struct ieee80211_local, fq); 1373 ieee80211_free_txskb(&local->hw, skb); 1374 } 1375 1376 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1377 struct fq_tin *tin, 1378 int idx, 1379 struct sk_buff *skb) 1380 { 1381 struct txq_info *txqi; 1382 1383 txqi = container_of(tin, struct txq_info, tin); 1384 return &txqi->def_flow; 1385 } 1386 1387 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1388 struct txq_info *txqi, 1389 struct sk_buff *skb) 1390 { 1391 struct fq *fq = &local->fq; 1392 struct fq_tin *tin = &txqi->tin; 1393 1394 ieee80211_set_skb_enqueue_time(skb); 1395 fq_tin_enqueue(fq, tin, skb, 1396 fq_skb_free_func, 1397 fq_flow_get_default_func); 1398 } 1399 1400 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1401 struct sta_info *sta, 1402 struct txq_info *txqi, int tid) 1403 { 1404 fq_tin_init(&txqi->tin); 1405 fq_flow_init(&txqi->def_flow); 1406 codel_vars_init(&txqi->def_cvars); 1407 1408 txqi->txq.vif = &sdata->vif; 1409 1410 if (sta) { 1411 txqi->txq.sta = &sta->sta; 1412 sta->sta.txq[tid] = &txqi->txq; 1413 txqi->txq.tid = tid; 1414 txqi->txq.ac = ieee802_1d_to_ac[tid & 7]; 1415 } else { 1416 sdata->vif.txq = &txqi->txq; 1417 txqi->txq.tid = 0; 1418 txqi->txq.ac = IEEE80211_AC_BE; 1419 } 1420 } 1421 1422 void ieee80211_txq_purge(struct ieee80211_local *local, 1423 struct txq_info *txqi) 1424 { 1425 struct fq *fq = &local->fq; 1426 struct fq_tin *tin = &txqi->tin; 1427 1428 fq_tin_reset(fq, tin, fq_skb_free_func); 1429 } 1430 1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1432 { 1433 struct fq *fq = &local->fq; 1434 int ret; 1435 int i; 1436 1437 if (!local->ops->wake_tx_queue) 1438 return 0; 1439 1440 ret = fq_init(fq, 4096); 1441 if (ret) 1442 return ret; 1443 1444 codel_params_init(&local->cparams); 1445 codel_stats_init(&local->cstats); 1446 local->cparams.interval = MS2TIME(100); 1447 local->cparams.target = MS2TIME(20); 1448 local->cparams.ecn = true; 1449 1450 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1451 GFP_KERNEL); 1452 if (!local->cvars) { 1453 spin_lock_bh(&fq->lock); 1454 fq_reset(fq, fq_skb_free_func); 1455 spin_unlock_bh(&fq->lock); 1456 return -ENOMEM; 1457 } 1458 1459 for (i = 0; i < fq->flows_cnt; i++) 1460 codel_vars_init(&local->cvars[i]); 1461 1462 return 0; 1463 } 1464 1465 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1466 { 1467 struct fq *fq = &local->fq; 1468 1469 if (!local->ops->wake_tx_queue) 1470 return; 1471 1472 kfree(local->cvars); 1473 local->cvars = NULL; 1474 1475 spin_lock_bh(&fq->lock); 1476 fq_reset(fq, fq_skb_free_func); 1477 spin_unlock_bh(&fq->lock); 1478 } 1479 1480 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1481 struct ieee80211_txq *txq) 1482 { 1483 struct ieee80211_local *local = hw_to_local(hw); 1484 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1485 struct ieee80211_hdr *hdr; 1486 struct sk_buff *skb = NULL; 1487 struct fq *fq = &local->fq; 1488 struct fq_tin *tin = &txqi->tin; 1489 1490 spin_lock_bh(&fq->lock); 1491 1492 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1493 goto out; 1494 1495 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 1496 if (!skb) 1497 goto out; 1498 1499 ieee80211_set_skb_vif(skb, txqi); 1500 1501 hdr = (struct ieee80211_hdr *)skb->data; 1502 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1503 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1504 sta); 1505 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1506 1507 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1508 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1509 info->flags |= IEEE80211_TX_CTL_AMPDU; 1510 else 1511 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1512 } 1513 1514 out: 1515 spin_unlock_bh(&fq->lock); 1516 1517 if (skb && skb_has_frag_list(skb) && 1518 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 1519 if (skb_linearize(skb)) { 1520 ieee80211_free_txskb(&local->hw, skb); 1521 return NULL; 1522 } 1523 } 1524 1525 return skb; 1526 } 1527 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1528 1529 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1530 struct ieee80211_vif *vif, 1531 struct ieee80211_sta *sta, 1532 struct sk_buff_head *skbs, 1533 bool txpending) 1534 { 1535 struct ieee80211_tx_control control = {}; 1536 struct fq *fq = &local->fq; 1537 struct sk_buff *skb, *tmp; 1538 struct txq_info *txqi; 1539 unsigned long flags; 1540 1541 skb_queue_walk_safe(skbs, skb, tmp) { 1542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1543 int q = info->hw_queue; 1544 1545 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1546 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1547 __skb_unlink(skb, skbs); 1548 ieee80211_free_txskb(&local->hw, skb); 1549 continue; 1550 } 1551 #endif 1552 1553 txqi = ieee80211_get_txq(local, vif, sta, skb); 1554 if (txqi) { 1555 info->control.vif = vif; 1556 1557 __skb_unlink(skb, skbs); 1558 1559 spin_lock_bh(&fq->lock); 1560 ieee80211_txq_enqueue(local, txqi, skb); 1561 spin_unlock_bh(&fq->lock); 1562 1563 drv_wake_tx_queue(local, txqi); 1564 1565 continue; 1566 } 1567 1568 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1569 if (local->queue_stop_reasons[q] || 1570 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1571 if (unlikely(info->flags & 1572 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1573 if (local->queue_stop_reasons[q] & 1574 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1575 /* 1576 * Drop off-channel frames if queues 1577 * are stopped for any reason other 1578 * than off-channel operation. Never 1579 * queue them. 1580 */ 1581 spin_unlock_irqrestore( 1582 &local->queue_stop_reason_lock, 1583 flags); 1584 ieee80211_purge_tx_queue(&local->hw, 1585 skbs); 1586 return true; 1587 } 1588 } else { 1589 1590 /* 1591 * Since queue is stopped, queue up frames for 1592 * later transmission from the tx-pending 1593 * tasklet when the queue is woken again. 1594 */ 1595 if (txpending) 1596 skb_queue_splice_init(skbs, 1597 &local->pending[q]); 1598 else 1599 skb_queue_splice_tail_init(skbs, 1600 &local->pending[q]); 1601 1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1603 flags); 1604 return false; 1605 } 1606 } 1607 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1608 1609 info->control.vif = vif; 1610 control.sta = sta; 1611 1612 __skb_unlink(skb, skbs); 1613 drv_tx(local, &control, skb); 1614 } 1615 1616 return true; 1617 } 1618 1619 /* 1620 * Returns false if the frame couldn't be transmitted but was queued instead. 1621 */ 1622 static bool __ieee80211_tx(struct ieee80211_local *local, 1623 struct sk_buff_head *skbs, int led_len, 1624 struct sta_info *sta, bool txpending) 1625 { 1626 struct ieee80211_tx_info *info; 1627 struct ieee80211_sub_if_data *sdata; 1628 struct ieee80211_vif *vif; 1629 struct ieee80211_sta *pubsta; 1630 struct sk_buff *skb; 1631 bool result = true; 1632 __le16 fc; 1633 1634 if (WARN_ON(skb_queue_empty(skbs))) 1635 return true; 1636 1637 skb = skb_peek(skbs); 1638 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1639 info = IEEE80211_SKB_CB(skb); 1640 sdata = vif_to_sdata(info->control.vif); 1641 if (sta && !sta->uploaded) 1642 sta = NULL; 1643 1644 if (sta) 1645 pubsta = &sta->sta; 1646 else 1647 pubsta = NULL; 1648 1649 switch (sdata->vif.type) { 1650 case NL80211_IFTYPE_MONITOR: 1651 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1652 vif = &sdata->vif; 1653 break; 1654 } 1655 sdata = rcu_dereference(local->monitor_sdata); 1656 if (sdata) { 1657 vif = &sdata->vif; 1658 info->hw_queue = 1659 vif->hw_queue[skb_get_queue_mapping(skb)]; 1660 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1661 ieee80211_purge_tx_queue(&local->hw, skbs); 1662 return true; 1663 } else 1664 vif = NULL; 1665 break; 1666 case NL80211_IFTYPE_AP_VLAN: 1667 sdata = container_of(sdata->bss, 1668 struct ieee80211_sub_if_data, u.ap); 1669 /* fall through */ 1670 default: 1671 vif = &sdata->vif; 1672 break; 1673 } 1674 1675 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1676 txpending); 1677 1678 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1679 1680 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1681 1682 return result; 1683 } 1684 1685 /* 1686 * Invoke TX handlers, return 0 on success and non-zero if the 1687 * frame was dropped or queued. 1688 */ 1689 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1690 { 1691 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1692 ieee80211_tx_result res = TX_DROP; 1693 1694 #define CALL_TXH(txh) \ 1695 do { \ 1696 res = txh(tx); \ 1697 if (res != TX_CONTINUE) \ 1698 goto txh_done; \ 1699 } while (0) 1700 1701 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1702 CALL_TXH(ieee80211_tx_h_check_assoc); 1703 CALL_TXH(ieee80211_tx_h_ps_buf); 1704 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1705 CALL_TXH(ieee80211_tx_h_select_key); 1706 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1707 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1708 1709 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1710 __skb_queue_tail(&tx->skbs, tx->skb); 1711 tx->skb = NULL; 1712 goto txh_done; 1713 } 1714 1715 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1716 CALL_TXH(ieee80211_tx_h_sequence); 1717 CALL_TXH(ieee80211_tx_h_fragment); 1718 /* handlers after fragment must be aware of tx info fragmentation! */ 1719 CALL_TXH(ieee80211_tx_h_stats); 1720 CALL_TXH(ieee80211_tx_h_encrypt); 1721 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1722 CALL_TXH(ieee80211_tx_h_calculate_duration); 1723 #undef CALL_TXH 1724 1725 txh_done: 1726 if (unlikely(res == TX_DROP)) { 1727 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1728 if (tx->skb) 1729 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1730 else 1731 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1732 return -1; 1733 } else if (unlikely(res == TX_QUEUED)) { 1734 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1735 return -1; 1736 } 1737 1738 return 0; 1739 } 1740 1741 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1742 struct ieee80211_vif *vif, struct sk_buff *skb, 1743 int band, struct ieee80211_sta **sta) 1744 { 1745 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1746 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1747 struct ieee80211_tx_data tx; 1748 struct sk_buff *skb2; 1749 1750 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1751 return false; 1752 1753 info->band = band; 1754 info->control.vif = vif; 1755 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1756 1757 if (invoke_tx_handlers(&tx)) 1758 return false; 1759 1760 if (sta) { 1761 if (tx.sta) 1762 *sta = &tx.sta->sta; 1763 else 1764 *sta = NULL; 1765 } 1766 1767 /* this function isn't suitable for fragmented data frames */ 1768 skb2 = __skb_dequeue(&tx.skbs); 1769 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1770 ieee80211_free_txskb(hw, skb2); 1771 ieee80211_purge_tx_queue(hw, &tx.skbs); 1772 return false; 1773 } 1774 1775 return true; 1776 } 1777 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1778 1779 /* 1780 * Returns false if the frame couldn't be transmitted but was queued instead. 1781 */ 1782 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1783 struct sta_info *sta, struct sk_buff *skb, 1784 bool txpending) 1785 { 1786 struct ieee80211_local *local = sdata->local; 1787 struct ieee80211_tx_data tx; 1788 ieee80211_tx_result res_prepare; 1789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1790 bool result = true; 1791 int led_len; 1792 1793 if (unlikely(skb->len < 10)) { 1794 dev_kfree_skb(skb); 1795 return true; 1796 } 1797 1798 /* initialises tx */ 1799 led_len = skb->len; 1800 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1801 1802 if (unlikely(res_prepare == TX_DROP)) { 1803 ieee80211_free_txskb(&local->hw, skb); 1804 return true; 1805 } else if (unlikely(res_prepare == TX_QUEUED)) { 1806 return true; 1807 } 1808 1809 /* set up hw_queue value early */ 1810 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1811 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1812 info->hw_queue = 1813 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1814 1815 if (!invoke_tx_handlers(&tx)) 1816 result = __ieee80211_tx(local, &tx.skbs, led_len, 1817 tx.sta, txpending); 1818 1819 return result; 1820 } 1821 1822 /* device xmit handlers */ 1823 1824 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1825 struct sk_buff *skb, 1826 int head_need, bool may_encrypt) 1827 { 1828 struct ieee80211_local *local = sdata->local; 1829 int tail_need = 0; 1830 1831 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1832 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1833 tail_need -= skb_tailroom(skb); 1834 tail_need = max_t(int, tail_need, 0); 1835 } 1836 1837 if (skb_cloned(skb) && 1838 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1839 !skb_clone_writable(skb, ETH_HLEN) || 1840 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1841 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1842 else if (head_need || tail_need) 1843 I802_DEBUG_INC(local->tx_expand_skb_head); 1844 else 1845 return 0; 1846 1847 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1848 wiphy_debug(local->hw.wiphy, 1849 "failed to reallocate TX buffer\n"); 1850 return -ENOMEM; 1851 } 1852 1853 return 0; 1854 } 1855 1856 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1857 struct sta_info *sta, struct sk_buff *skb) 1858 { 1859 struct ieee80211_local *local = sdata->local; 1860 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1861 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1862 int headroom; 1863 bool may_encrypt; 1864 1865 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1866 1867 headroom = local->tx_headroom; 1868 if (may_encrypt) 1869 headroom += sdata->encrypt_headroom; 1870 headroom -= skb_headroom(skb); 1871 headroom = max_t(int, 0, headroom); 1872 1873 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1874 ieee80211_free_txskb(&local->hw, skb); 1875 return; 1876 } 1877 1878 hdr = (struct ieee80211_hdr *) skb->data; 1879 info->control.vif = &sdata->vif; 1880 1881 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1882 if (ieee80211_is_data(hdr->frame_control) && 1883 is_unicast_ether_addr(hdr->addr1)) { 1884 if (mesh_nexthop_resolve(sdata, skb)) 1885 return; /* skb queued: don't free */ 1886 } else { 1887 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1888 } 1889 } 1890 1891 ieee80211_set_qos_hdr(sdata, skb); 1892 ieee80211_tx(sdata, sta, skb, false); 1893 } 1894 1895 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1896 struct sk_buff *skb) 1897 { 1898 struct ieee80211_radiotap_iterator iterator; 1899 struct ieee80211_radiotap_header *rthdr = 1900 (struct ieee80211_radiotap_header *) skb->data; 1901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1902 struct ieee80211_supported_band *sband = 1903 local->hw.wiphy->bands[info->band]; 1904 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1905 NULL); 1906 u16 txflags; 1907 u16 rate = 0; 1908 bool rate_found = false; 1909 u8 rate_retries = 0; 1910 u16 rate_flags = 0; 1911 u8 mcs_known, mcs_flags, mcs_bw; 1912 u16 vht_known; 1913 u8 vht_mcs = 0, vht_nss = 0; 1914 int i; 1915 1916 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1917 IEEE80211_TX_CTL_DONTFRAG; 1918 1919 /* 1920 * for every radiotap entry that is present 1921 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1922 * entries present, or -EINVAL on error) 1923 */ 1924 1925 while (!ret) { 1926 ret = ieee80211_radiotap_iterator_next(&iterator); 1927 1928 if (ret) 1929 continue; 1930 1931 /* see if this argument is something we can use */ 1932 switch (iterator.this_arg_index) { 1933 /* 1934 * You must take care when dereferencing iterator.this_arg 1935 * for multibyte types... the pointer is not aligned. Use 1936 * get_unaligned((type *)iterator.this_arg) to dereference 1937 * iterator.this_arg for type "type" safely on all arches. 1938 */ 1939 case IEEE80211_RADIOTAP_FLAGS: 1940 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1941 /* 1942 * this indicates that the skb we have been 1943 * handed has the 32-bit FCS CRC at the end... 1944 * we should react to that by snipping it off 1945 * because it will be recomputed and added 1946 * on transmission 1947 */ 1948 if (skb->len < (iterator._max_length + FCS_LEN)) 1949 return false; 1950 1951 skb_trim(skb, skb->len - FCS_LEN); 1952 } 1953 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1954 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1955 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1956 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1957 break; 1958 1959 case IEEE80211_RADIOTAP_TX_FLAGS: 1960 txflags = get_unaligned_le16(iterator.this_arg); 1961 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1962 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1963 break; 1964 1965 case IEEE80211_RADIOTAP_RATE: 1966 rate = *iterator.this_arg; 1967 rate_flags = 0; 1968 rate_found = true; 1969 break; 1970 1971 case IEEE80211_RADIOTAP_DATA_RETRIES: 1972 rate_retries = *iterator.this_arg; 1973 break; 1974 1975 case IEEE80211_RADIOTAP_MCS: 1976 mcs_known = iterator.this_arg[0]; 1977 mcs_flags = iterator.this_arg[1]; 1978 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 1979 break; 1980 1981 rate_found = true; 1982 rate = iterator.this_arg[2]; 1983 rate_flags = IEEE80211_TX_RC_MCS; 1984 1985 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 1986 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 1987 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1988 1989 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 1990 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 1991 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 1992 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 1993 break; 1994 1995 case IEEE80211_RADIOTAP_VHT: 1996 vht_known = get_unaligned_le16(iterator.this_arg); 1997 rate_found = true; 1998 1999 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2000 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2001 (iterator.this_arg[2] & 2002 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2003 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2004 if (vht_known & 2005 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2006 if (iterator.this_arg[3] == 1) 2007 rate_flags |= 2008 IEEE80211_TX_RC_40_MHZ_WIDTH; 2009 else if (iterator.this_arg[3] == 4) 2010 rate_flags |= 2011 IEEE80211_TX_RC_80_MHZ_WIDTH; 2012 else if (iterator.this_arg[3] == 11) 2013 rate_flags |= 2014 IEEE80211_TX_RC_160_MHZ_WIDTH; 2015 } 2016 2017 vht_mcs = iterator.this_arg[4] >> 4; 2018 vht_nss = iterator.this_arg[4] & 0xF; 2019 break; 2020 2021 /* 2022 * Please update the file 2023 * Documentation/networking/mac80211-injection.txt 2024 * when parsing new fields here. 2025 */ 2026 2027 default: 2028 break; 2029 } 2030 } 2031 2032 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2033 return false; 2034 2035 if (rate_found) { 2036 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2037 2038 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2039 info->control.rates[i].idx = -1; 2040 info->control.rates[i].flags = 0; 2041 info->control.rates[i].count = 0; 2042 } 2043 2044 if (rate_flags & IEEE80211_TX_RC_MCS) { 2045 info->control.rates[0].idx = rate; 2046 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2047 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2048 vht_nss); 2049 } else { 2050 for (i = 0; i < sband->n_bitrates; i++) { 2051 if (rate * 5 != sband->bitrates[i].bitrate) 2052 continue; 2053 2054 info->control.rates[0].idx = i; 2055 break; 2056 } 2057 } 2058 2059 if (info->control.rates[0].idx < 0) 2060 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2061 2062 info->control.rates[0].flags = rate_flags; 2063 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2064 local->hw.max_rate_tries); 2065 } 2066 2067 /* 2068 * remove the radiotap header 2069 * iterator->_max_length was sanity-checked against 2070 * skb->len by iterator init 2071 */ 2072 skb_pull(skb, iterator._max_length); 2073 2074 return true; 2075 } 2076 2077 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2078 struct net_device *dev) 2079 { 2080 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2081 struct ieee80211_chanctx_conf *chanctx_conf; 2082 struct ieee80211_radiotap_header *prthdr = 2083 (struct ieee80211_radiotap_header *)skb->data; 2084 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2085 struct ieee80211_hdr *hdr; 2086 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2087 struct cfg80211_chan_def *chandef; 2088 u16 len_rthdr; 2089 int hdrlen; 2090 2091 /* check for not even having the fixed radiotap header part */ 2092 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2093 goto fail; /* too short to be possibly valid */ 2094 2095 /* is it a header version we can trust to find length from? */ 2096 if (unlikely(prthdr->it_version)) 2097 goto fail; /* only version 0 is supported */ 2098 2099 /* then there must be a radiotap header with a length we can use */ 2100 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2101 2102 /* does the skb contain enough to deliver on the alleged length? */ 2103 if (unlikely(skb->len < len_rthdr)) 2104 goto fail; /* skb too short for claimed rt header extent */ 2105 2106 /* 2107 * fix up the pointers accounting for the radiotap 2108 * header still being in there. We are being given 2109 * a precooked IEEE80211 header so no need for 2110 * normal processing 2111 */ 2112 skb_set_mac_header(skb, len_rthdr); 2113 /* 2114 * these are just fixed to the end of the rt area since we 2115 * don't have any better information and at this point, nobody cares 2116 */ 2117 skb_set_network_header(skb, len_rthdr); 2118 skb_set_transport_header(skb, len_rthdr); 2119 2120 if (skb->len < len_rthdr + 2) 2121 goto fail; 2122 2123 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2124 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2125 2126 if (skb->len < len_rthdr + hdrlen) 2127 goto fail; 2128 2129 /* 2130 * Initialize skb->protocol if the injected frame is a data frame 2131 * carrying a rfc1042 header 2132 */ 2133 if (ieee80211_is_data(hdr->frame_control) && 2134 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2135 u8 *payload = (u8 *)hdr + hdrlen; 2136 2137 if (ether_addr_equal(payload, rfc1042_header)) 2138 skb->protocol = cpu_to_be16((payload[6] << 8) | 2139 payload[7]); 2140 } 2141 2142 memset(info, 0, sizeof(*info)); 2143 2144 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2145 IEEE80211_TX_CTL_INJECTED; 2146 2147 rcu_read_lock(); 2148 2149 /* 2150 * We process outgoing injected frames that have a local address 2151 * we handle as though they are non-injected frames. 2152 * This code here isn't entirely correct, the local MAC address 2153 * isn't always enough to find the interface to use; for proper 2154 * VLAN/WDS support we will need a different mechanism (which 2155 * likely isn't going to be monitor interfaces). 2156 */ 2157 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2158 2159 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2160 if (!ieee80211_sdata_running(tmp_sdata)) 2161 continue; 2162 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2163 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2164 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2165 continue; 2166 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2167 sdata = tmp_sdata; 2168 break; 2169 } 2170 } 2171 2172 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2173 if (!chanctx_conf) { 2174 tmp_sdata = rcu_dereference(local->monitor_sdata); 2175 if (tmp_sdata) 2176 chanctx_conf = 2177 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2178 } 2179 2180 if (chanctx_conf) 2181 chandef = &chanctx_conf->def; 2182 else if (!local->use_chanctx) 2183 chandef = &local->_oper_chandef; 2184 else 2185 goto fail_rcu; 2186 2187 /* 2188 * Frame injection is not allowed if beaconing is not allowed 2189 * or if we need radar detection. Beaconing is usually not allowed when 2190 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2191 * Passive scan is also used in world regulatory domains where 2192 * your country is not known and as such it should be treated as 2193 * NO TX unless the channel is explicitly allowed in which case 2194 * your current regulatory domain would not have the passive scan 2195 * flag. 2196 * 2197 * Since AP mode uses monitor interfaces to inject/TX management 2198 * frames we can make AP mode the exception to this rule once it 2199 * supports radar detection as its implementation can deal with 2200 * radar detection by itself. We can do that later by adding a 2201 * monitor flag interfaces used for AP support. 2202 */ 2203 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2204 sdata->vif.type)) 2205 goto fail_rcu; 2206 2207 info->band = chandef->chan->band; 2208 2209 /* process and remove the injection radiotap header */ 2210 if (!ieee80211_parse_tx_radiotap(local, skb)) 2211 goto fail_rcu; 2212 2213 ieee80211_xmit(sdata, NULL, skb); 2214 rcu_read_unlock(); 2215 2216 return NETDEV_TX_OK; 2217 2218 fail_rcu: 2219 rcu_read_unlock(); 2220 fail: 2221 dev_kfree_skb(skb); 2222 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2223 } 2224 2225 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2226 { 2227 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2228 2229 return ethertype == ETH_P_TDLS && 2230 skb->len > 14 && 2231 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2232 } 2233 2234 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2235 struct sk_buff *skb, 2236 struct sta_info **sta_out) 2237 { 2238 struct sta_info *sta; 2239 2240 switch (sdata->vif.type) { 2241 case NL80211_IFTYPE_AP_VLAN: 2242 sta = rcu_dereference(sdata->u.vlan.sta); 2243 if (sta) { 2244 *sta_out = sta; 2245 return 0; 2246 } else if (sdata->wdev.use_4addr) { 2247 return -ENOLINK; 2248 } 2249 /* fall through */ 2250 case NL80211_IFTYPE_AP: 2251 case NL80211_IFTYPE_OCB: 2252 case NL80211_IFTYPE_ADHOC: 2253 if (is_multicast_ether_addr(skb->data)) { 2254 *sta_out = ERR_PTR(-ENOENT); 2255 return 0; 2256 } 2257 sta = sta_info_get_bss(sdata, skb->data); 2258 break; 2259 case NL80211_IFTYPE_WDS: 2260 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2261 break; 2262 #ifdef CONFIG_MAC80211_MESH 2263 case NL80211_IFTYPE_MESH_POINT: 2264 /* determined much later */ 2265 *sta_out = NULL; 2266 return 0; 2267 #endif 2268 case NL80211_IFTYPE_STATION: 2269 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2270 sta = sta_info_get(sdata, skb->data); 2271 if (sta) { 2272 bool tdls_peer, tdls_auth; 2273 2274 tdls_peer = test_sta_flag(sta, 2275 WLAN_STA_TDLS_PEER); 2276 tdls_auth = test_sta_flag(sta, 2277 WLAN_STA_TDLS_PEER_AUTH); 2278 2279 if (tdls_peer && tdls_auth) { 2280 *sta_out = sta; 2281 return 0; 2282 } 2283 2284 /* 2285 * TDLS link during setup - throw out frames to 2286 * peer. Allow TDLS-setup frames to unauthorized 2287 * peers for the special case of a link teardown 2288 * after a TDLS sta is removed due to being 2289 * unreachable. 2290 */ 2291 if (tdls_peer && !tdls_auth && 2292 !ieee80211_is_tdls_setup(skb)) 2293 return -EINVAL; 2294 } 2295 2296 } 2297 2298 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2299 if (!sta) 2300 return -ENOLINK; 2301 break; 2302 default: 2303 return -EINVAL; 2304 } 2305 2306 *sta_out = sta ?: ERR_PTR(-ENOENT); 2307 return 0; 2308 } 2309 2310 /** 2311 * ieee80211_build_hdr - build 802.11 header in the given frame 2312 * @sdata: virtual interface to build the header for 2313 * @skb: the skb to build the header in 2314 * @info_flags: skb flags to set 2315 * 2316 * This function takes the skb with 802.3 header and reformats the header to 2317 * the appropriate IEEE 802.11 header based on which interface the packet is 2318 * being transmitted on. 2319 * 2320 * Note that this function also takes care of the TX status request and 2321 * potential unsharing of the SKB - this needs to be interleaved with the 2322 * header building. 2323 * 2324 * The function requires the read-side RCU lock held 2325 * 2326 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2327 */ 2328 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2329 struct sk_buff *skb, u32 info_flags, 2330 struct sta_info *sta) 2331 { 2332 struct ieee80211_local *local = sdata->local; 2333 struct ieee80211_tx_info *info; 2334 int head_need; 2335 u16 ethertype, hdrlen, meshhdrlen = 0; 2336 __le16 fc; 2337 struct ieee80211_hdr hdr; 2338 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2339 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2340 const u8 *encaps_data; 2341 int encaps_len, skip_header_bytes; 2342 int nh_pos, h_pos; 2343 bool wme_sta = false, authorized = false; 2344 bool tdls_peer; 2345 bool multicast; 2346 u16 info_id = 0; 2347 struct ieee80211_chanctx_conf *chanctx_conf; 2348 struct ieee80211_sub_if_data *ap_sdata; 2349 enum nl80211_band band; 2350 int ret; 2351 2352 if (IS_ERR(sta)) 2353 sta = NULL; 2354 2355 /* convert Ethernet header to proper 802.11 header (based on 2356 * operation mode) */ 2357 ethertype = (skb->data[12] << 8) | skb->data[13]; 2358 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2359 2360 switch (sdata->vif.type) { 2361 case NL80211_IFTYPE_AP_VLAN: 2362 if (sdata->wdev.use_4addr) { 2363 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2364 /* RA TA DA SA */ 2365 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2366 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2367 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2368 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2369 hdrlen = 30; 2370 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2371 wme_sta = sta->sta.wme; 2372 } 2373 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2374 u.ap); 2375 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2376 if (!chanctx_conf) { 2377 ret = -ENOTCONN; 2378 goto free; 2379 } 2380 band = chanctx_conf->def.chan->band; 2381 if (sdata->wdev.use_4addr) 2382 break; 2383 /* fall through */ 2384 case NL80211_IFTYPE_AP: 2385 if (sdata->vif.type == NL80211_IFTYPE_AP) 2386 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2387 if (!chanctx_conf) { 2388 ret = -ENOTCONN; 2389 goto free; 2390 } 2391 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2392 /* DA BSSID SA */ 2393 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2394 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2395 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2396 hdrlen = 24; 2397 band = chanctx_conf->def.chan->band; 2398 break; 2399 case NL80211_IFTYPE_WDS: 2400 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2401 /* RA TA DA SA */ 2402 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2403 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2404 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2405 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2406 hdrlen = 30; 2407 /* 2408 * This is the exception! WDS style interfaces are prohibited 2409 * when channel contexts are in used so this must be valid 2410 */ 2411 band = local->hw.conf.chandef.chan->band; 2412 break; 2413 #ifdef CONFIG_MAC80211_MESH 2414 case NL80211_IFTYPE_MESH_POINT: 2415 if (!is_multicast_ether_addr(skb->data)) { 2416 struct sta_info *next_hop; 2417 bool mpp_lookup = true; 2418 2419 mpath = mesh_path_lookup(sdata, skb->data); 2420 if (mpath) { 2421 mpp_lookup = false; 2422 next_hop = rcu_dereference(mpath->next_hop); 2423 if (!next_hop || 2424 !(mpath->flags & (MESH_PATH_ACTIVE | 2425 MESH_PATH_RESOLVING))) 2426 mpp_lookup = true; 2427 } 2428 2429 if (mpp_lookup) { 2430 mppath = mpp_path_lookup(sdata, skb->data); 2431 if (mppath) 2432 mppath->exp_time = jiffies; 2433 } 2434 2435 if (mppath && mpath) 2436 mesh_path_del(sdata, mpath->dst); 2437 } 2438 2439 /* 2440 * Use address extension if it is a packet from 2441 * another interface or if we know the destination 2442 * is being proxied by a portal (i.e. portal address 2443 * differs from proxied address) 2444 */ 2445 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2446 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2447 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2448 skb->data, skb->data + ETH_ALEN); 2449 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2450 NULL, NULL); 2451 } else { 2452 /* DS -> MBSS (802.11-2012 13.11.3.3). 2453 * For unicast with unknown forwarding information, 2454 * destination might be in the MBSS or if that fails 2455 * forwarded to another mesh gate. In either case 2456 * resolution will be handled in ieee80211_xmit(), so 2457 * leave the original DA. This also works for mcast */ 2458 const u8 *mesh_da = skb->data; 2459 2460 if (mppath) 2461 mesh_da = mppath->mpp; 2462 else if (mpath) 2463 mesh_da = mpath->dst; 2464 2465 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2466 mesh_da, sdata->vif.addr); 2467 if (is_multicast_ether_addr(mesh_da)) 2468 /* DA TA mSA AE:SA */ 2469 meshhdrlen = ieee80211_new_mesh_header( 2470 sdata, &mesh_hdr, 2471 skb->data + ETH_ALEN, NULL); 2472 else 2473 /* RA TA mDA mSA AE:DA SA */ 2474 meshhdrlen = ieee80211_new_mesh_header( 2475 sdata, &mesh_hdr, skb->data, 2476 skb->data + ETH_ALEN); 2477 2478 } 2479 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2480 if (!chanctx_conf) { 2481 ret = -ENOTCONN; 2482 goto free; 2483 } 2484 band = chanctx_conf->def.chan->band; 2485 break; 2486 #endif 2487 case NL80211_IFTYPE_STATION: 2488 /* we already did checks when looking up the RA STA */ 2489 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2490 2491 if (tdls_peer) { 2492 /* DA SA BSSID */ 2493 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2494 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2495 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2496 hdrlen = 24; 2497 } else if (sdata->u.mgd.use_4addr && 2498 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2499 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2500 IEEE80211_FCTL_TODS); 2501 /* RA TA DA SA */ 2502 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2503 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2504 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2505 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2506 hdrlen = 30; 2507 } else { 2508 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2509 /* BSSID SA DA */ 2510 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2511 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2512 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2513 hdrlen = 24; 2514 } 2515 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2516 if (!chanctx_conf) { 2517 ret = -ENOTCONN; 2518 goto free; 2519 } 2520 band = chanctx_conf->def.chan->band; 2521 break; 2522 case NL80211_IFTYPE_OCB: 2523 /* DA SA BSSID */ 2524 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2525 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2526 eth_broadcast_addr(hdr.addr3); 2527 hdrlen = 24; 2528 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2529 if (!chanctx_conf) { 2530 ret = -ENOTCONN; 2531 goto free; 2532 } 2533 band = chanctx_conf->def.chan->band; 2534 break; 2535 case NL80211_IFTYPE_ADHOC: 2536 /* DA SA BSSID */ 2537 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2538 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2539 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2540 hdrlen = 24; 2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2542 if (!chanctx_conf) { 2543 ret = -ENOTCONN; 2544 goto free; 2545 } 2546 band = chanctx_conf->def.chan->band; 2547 break; 2548 default: 2549 ret = -EINVAL; 2550 goto free; 2551 } 2552 2553 multicast = is_multicast_ether_addr(hdr.addr1); 2554 2555 /* sta is always NULL for mesh */ 2556 if (sta) { 2557 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2558 wme_sta = sta->sta.wme; 2559 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2560 /* For mesh, the use of the QoS header is mandatory */ 2561 wme_sta = true; 2562 } 2563 2564 /* receiver does QoS (which also means we do) use it */ 2565 if (wme_sta) { 2566 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2567 hdrlen += 2; 2568 } 2569 2570 /* 2571 * Drop unicast frames to unauthorised stations unless they are 2572 * EAPOL frames from the local station. 2573 */ 2574 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2575 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2576 !multicast && !authorized && 2577 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2578 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2579 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2580 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2581 sdata->name, hdr.addr1); 2582 #endif 2583 2584 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2585 2586 ret = -EPERM; 2587 goto free; 2588 } 2589 2590 if (unlikely(!multicast && skb->sk && 2591 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2592 struct sk_buff *ack_skb = skb_clone_sk(skb); 2593 2594 if (ack_skb) { 2595 unsigned long flags; 2596 int id; 2597 2598 spin_lock_irqsave(&local->ack_status_lock, flags); 2599 id = idr_alloc(&local->ack_status_frames, ack_skb, 2600 1, 0x10000, GFP_ATOMIC); 2601 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2602 2603 if (id >= 0) { 2604 info_id = id; 2605 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2606 } else { 2607 kfree_skb(ack_skb); 2608 } 2609 } 2610 } 2611 2612 /* 2613 * If the skb is shared we need to obtain our own copy. 2614 */ 2615 if (skb_shared(skb)) { 2616 struct sk_buff *tmp_skb = skb; 2617 2618 /* can't happen -- skb is a clone if info_id != 0 */ 2619 WARN_ON(info_id); 2620 2621 skb = skb_clone(skb, GFP_ATOMIC); 2622 kfree_skb(tmp_skb); 2623 2624 if (!skb) { 2625 ret = -ENOMEM; 2626 goto free; 2627 } 2628 } 2629 2630 hdr.frame_control = fc; 2631 hdr.duration_id = 0; 2632 hdr.seq_ctrl = 0; 2633 2634 skip_header_bytes = ETH_HLEN; 2635 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2636 encaps_data = bridge_tunnel_header; 2637 encaps_len = sizeof(bridge_tunnel_header); 2638 skip_header_bytes -= 2; 2639 } else if (ethertype >= ETH_P_802_3_MIN) { 2640 encaps_data = rfc1042_header; 2641 encaps_len = sizeof(rfc1042_header); 2642 skip_header_bytes -= 2; 2643 } else { 2644 encaps_data = NULL; 2645 encaps_len = 0; 2646 } 2647 2648 nh_pos = skb_network_header(skb) - skb->data; 2649 h_pos = skb_transport_header(skb) - skb->data; 2650 2651 skb_pull(skb, skip_header_bytes); 2652 nh_pos -= skip_header_bytes; 2653 h_pos -= skip_header_bytes; 2654 2655 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2656 2657 /* 2658 * So we need to modify the skb header and hence need a copy of 2659 * that. The head_need variable above doesn't, so far, include 2660 * the needed header space that we don't need right away. If we 2661 * can, then we don't reallocate right now but only after the 2662 * frame arrives at the master device (if it does...) 2663 * 2664 * If we cannot, however, then we will reallocate to include all 2665 * the ever needed space. Also, if we need to reallocate it anyway, 2666 * make it big enough for everything we may ever need. 2667 */ 2668 2669 if (head_need > 0 || skb_cloned(skb)) { 2670 head_need += sdata->encrypt_headroom; 2671 head_need += local->tx_headroom; 2672 head_need = max_t(int, 0, head_need); 2673 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2674 ieee80211_free_txskb(&local->hw, skb); 2675 skb = NULL; 2676 return ERR_PTR(-ENOMEM); 2677 } 2678 } 2679 2680 if (encaps_data) { 2681 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2682 nh_pos += encaps_len; 2683 h_pos += encaps_len; 2684 } 2685 2686 #ifdef CONFIG_MAC80211_MESH 2687 if (meshhdrlen > 0) { 2688 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2689 nh_pos += meshhdrlen; 2690 h_pos += meshhdrlen; 2691 } 2692 #endif 2693 2694 if (ieee80211_is_data_qos(fc)) { 2695 __le16 *qos_control; 2696 2697 qos_control = (__le16 *) skb_push(skb, 2); 2698 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2699 /* 2700 * Maybe we could actually set some fields here, for now just 2701 * initialise to zero to indicate no special operation. 2702 */ 2703 *qos_control = 0; 2704 } else 2705 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2706 2707 nh_pos += hdrlen; 2708 h_pos += hdrlen; 2709 2710 /* Update skb pointers to various headers since this modified frame 2711 * is going to go through Linux networking code that may potentially 2712 * need things like pointer to IP header. */ 2713 skb_reset_mac_header(skb); 2714 skb_set_network_header(skb, nh_pos); 2715 skb_set_transport_header(skb, h_pos); 2716 2717 info = IEEE80211_SKB_CB(skb); 2718 memset(info, 0, sizeof(*info)); 2719 2720 info->flags = info_flags; 2721 info->ack_frame_id = info_id; 2722 info->band = band; 2723 2724 return skb; 2725 free: 2726 kfree_skb(skb); 2727 return ERR_PTR(ret); 2728 } 2729 2730 /* 2731 * fast-xmit overview 2732 * 2733 * The core idea of this fast-xmit is to remove per-packet checks by checking 2734 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2735 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2736 * much less work can be done per packet. For example, fragmentation must be 2737 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2738 * in the code here. 2739 * 2740 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2741 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2742 * 2743 * The most difficult part of this is that when any of these assumptions 2744 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2745 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2746 * since the per-packet code no longer checks the conditions. This is reflected 2747 * by the calls to these functions throughout the rest of the code, and must be 2748 * maintained if any of the TX path checks change. 2749 */ 2750 2751 void ieee80211_check_fast_xmit(struct sta_info *sta) 2752 { 2753 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2754 struct ieee80211_local *local = sta->local; 2755 struct ieee80211_sub_if_data *sdata = sta->sdata; 2756 struct ieee80211_hdr *hdr = (void *)build.hdr; 2757 struct ieee80211_chanctx_conf *chanctx_conf; 2758 __le16 fc; 2759 2760 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2761 return; 2762 2763 /* Locking here protects both the pointer itself, and against concurrent 2764 * invocations winning data access races to, e.g., the key pointer that 2765 * is used. 2766 * Without it, the invocation of this function right after the key 2767 * pointer changes wouldn't be sufficient, as another CPU could access 2768 * the pointer, then stall, and then do the cache update after the CPU 2769 * that invalidated the key. 2770 * With the locking, such scenarios cannot happen as the check for the 2771 * key and the fast-tx assignment are done atomically, so the CPU that 2772 * modifies the key will either wait or other one will see the key 2773 * cleared/changed already. 2774 */ 2775 spin_lock_bh(&sta->lock); 2776 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2777 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2778 sdata->vif.type == NL80211_IFTYPE_STATION) 2779 goto out; 2780 2781 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2782 goto out; 2783 2784 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2785 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2786 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2787 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2788 goto out; 2789 2790 if (sdata->noack_map) 2791 goto out; 2792 2793 /* fast-xmit doesn't handle fragmentation at all */ 2794 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2795 !local->ops->set_frag_threshold) 2796 goto out; 2797 2798 rcu_read_lock(); 2799 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2800 if (!chanctx_conf) { 2801 rcu_read_unlock(); 2802 goto out; 2803 } 2804 build.band = chanctx_conf->def.chan->band; 2805 rcu_read_unlock(); 2806 2807 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2808 2809 switch (sdata->vif.type) { 2810 case NL80211_IFTYPE_ADHOC: 2811 /* DA SA BSSID */ 2812 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2813 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2814 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2815 build.hdr_len = 24; 2816 break; 2817 case NL80211_IFTYPE_STATION: 2818 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2819 /* DA SA BSSID */ 2820 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2821 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2822 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2823 build.hdr_len = 24; 2824 break; 2825 } 2826 2827 if (sdata->u.mgd.use_4addr) { 2828 /* non-regular ethertype cannot use the fastpath */ 2829 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2830 IEEE80211_FCTL_TODS); 2831 /* RA TA DA SA */ 2832 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2833 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2834 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2835 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2836 build.hdr_len = 30; 2837 break; 2838 } 2839 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2840 /* BSSID SA DA */ 2841 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2842 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2843 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2844 build.hdr_len = 24; 2845 break; 2846 case NL80211_IFTYPE_AP_VLAN: 2847 if (sdata->wdev.use_4addr) { 2848 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2849 IEEE80211_FCTL_TODS); 2850 /* RA TA DA SA */ 2851 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2852 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2853 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2854 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2855 build.hdr_len = 30; 2856 break; 2857 } 2858 /* fall through */ 2859 case NL80211_IFTYPE_AP: 2860 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2861 /* DA BSSID SA */ 2862 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2863 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2864 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2865 build.hdr_len = 24; 2866 break; 2867 default: 2868 /* not handled on fast-xmit */ 2869 goto out; 2870 } 2871 2872 if (sta->sta.wme) { 2873 build.hdr_len += 2; 2874 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2875 } 2876 2877 /* We store the key here so there's no point in using rcu_dereference() 2878 * but that's fine because the code that changes the pointers will call 2879 * this function after doing so. For a single CPU that would be enough, 2880 * for multiple see the comment above. 2881 */ 2882 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2883 if (!build.key) 2884 build.key = rcu_access_pointer(sdata->default_unicast_key); 2885 if (build.key) { 2886 bool gen_iv, iv_spc, mmic; 2887 2888 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2889 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2890 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2891 2892 /* don't handle software crypto */ 2893 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2894 goto out; 2895 2896 switch (build.key->conf.cipher) { 2897 case WLAN_CIPHER_SUITE_CCMP: 2898 case WLAN_CIPHER_SUITE_CCMP_256: 2899 /* add fixed key ID */ 2900 if (gen_iv) { 2901 (build.hdr + build.hdr_len)[3] = 2902 0x20 | (build.key->conf.keyidx << 6); 2903 build.pn_offs = build.hdr_len; 2904 } 2905 if (gen_iv || iv_spc) 2906 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2907 break; 2908 case WLAN_CIPHER_SUITE_GCMP: 2909 case WLAN_CIPHER_SUITE_GCMP_256: 2910 /* add fixed key ID */ 2911 if (gen_iv) { 2912 (build.hdr + build.hdr_len)[3] = 2913 0x20 | (build.key->conf.keyidx << 6); 2914 build.pn_offs = build.hdr_len; 2915 } 2916 if (gen_iv || iv_spc) 2917 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2918 break; 2919 case WLAN_CIPHER_SUITE_TKIP: 2920 /* cannot handle MMIC or IV generation in xmit-fast */ 2921 if (mmic || gen_iv) 2922 goto out; 2923 if (iv_spc) 2924 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2925 break; 2926 case WLAN_CIPHER_SUITE_WEP40: 2927 case WLAN_CIPHER_SUITE_WEP104: 2928 /* cannot handle IV generation in fast-xmit */ 2929 if (gen_iv) 2930 goto out; 2931 if (iv_spc) 2932 build.hdr_len += IEEE80211_WEP_IV_LEN; 2933 break; 2934 case WLAN_CIPHER_SUITE_AES_CMAC: 2935 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2936 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2937 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2938 WARN(1, 2939 "management cipher suite 0x%x enabled for data\n", 2940 build.key->conf.cipher); 2941 goto out; 2942 default: 2943 /* we don't know how to generate IVs for this at all */ 2944 if (WARN_ON(gen_iv)) 2945 goto out; 2946 /* pure hardware keys are OK, of course */ 2947 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2948 break; 2949 /* cipher scheme might require space allocation */ 2950 if (iv_spc && 2951 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2952 goto out; 2953 if (iv_spc) 2954 build.hdr_len += build.key->conf.iv_len; 2955 } 2956 2957 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2958 } 2959 2960 hdr->frame_control = fc; 2961 2962 memcpy(build.hdr + build.hdr_len, 2963 rfc1042_header, sizeof(rfc1042_header)); 2964 build.hdr_len += sizeof(rfc1042_header); 2965 2966 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2967 /* if the kmemdup fails, continue w/o fast_tx */ 2968 if (!fast_tx) 2969 goto out; 2970 2971 out: 2972 /* we might have raced against another call to this function */ 2973 old = rcu_dereference_protected(sta->fast_tx, 2974 lockdep_is_held(&sta->lock)); 2975 rcu_assign_pointer(sta->fast_tx, fast_tx); 2976 if (old) 2977 kfree_rcu(old, rcu_head); 2978 spin_unlock_bh(&sta->lock); 2979 } 2980 2981 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2982 { 2983 struct sta_info *sta; 2984 2985 rcu_read_lock(); 2986 list_for_each_entry_rcu(sta, &local->sta_list, list) 2987 ieee80211_check_fast_xmit(sta); 2988 rcu_read_unlock(); 2989 } 2990 2991 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2992 { 2993 struct ieee80211_local *local = sdata->local; 2994 struct sta_info *sta; 2995 2996 rcu_read_lock(); 2997 2998 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2999 if (sdata != sta->sdata && 3000 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3001 continue; 3002 ieee80211_check_fast_xmit(sta); 3003 } 3004 3005 rcu_read_unlock(); 3006 } 3007 3008 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3009 { 3010 struct ieee80211_fast_tx *fast_tx; 3011 3012 spin_lock_bh(&sta->lock); 3013 fast_tx = rcu_dereference_protected(sta->fast_tx, 3014 lockdep_is_held(&sta->lock)); 3015 RCU_INIT_POINTER(sta->fast_tx, NULL); 3016 spin_unlock_bh(&sta->lock); 3017 3018 if (fast_tx) 3019 kfree_rcu(fast_tx, rcu_head); 3020 } 3021 3022 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3023 struct sk_buff *skb, int headroom, 3024 int *subframe_len) 3025 { 3026 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3027 int padding = (4 - amsdu_len) & 3; 3028 3029 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3030 I802_DEBUG_INC(local->tx_expand_skb_head); 3031 3032 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3033 wiphy_debug(local->hw.wiphy, 3034 "failed to reallocate TX buffer\n"); 3035 return false; 3036 } 3037 } 3038 3039 if (padding) { 3040 *subframe_len += padding; 3041 memset(skb_put(skb, padding), 0, padding); 3042 } 3043 3044 return true; 3045 } 3046 3047 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3048 struct ieee80211_fast_tx *fast_tx, 3049 struct sk_buff *skb) 3050 { 3051 struct ieee80211_local *local = sdata->local; 3052 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3053 struct ieee80211_hdr *hdr; 3054 struct ethhdr amsdu_hdr; 3055 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3056 int subframe_len = skb->len - hdr_len; 3057 void *data; 3058 u8 *qc; 3059 3060 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3061 return false; 3062 3063 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3064 return true; 3065 3066 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr), 3067 &subframe_len)) 3068 return false; 3069 3070 amsdu_hdr.h_proto = cpu_to_be16(subframe_len); 3071 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN); 3072 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN); 3073 3074 data = skb_push(skb, sizeof(amsdu_hdr)); 3075 memmove(data, data + sizeof(amsdu_hdr), hdr_len); 3076 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr)); 3077 3078 hdr = data; 3079 qc = ieee80211_get_qos_ctl(hdr); 3080 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3081 3082 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3083 3084 return true; 3085 } 3086 3087 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3088 struct sta_info *sta, 3089 struct ieee80211_fast_tx *fast_tx, 3090 struct sk_buff *skb) 3091 { 3092 struct ieee80211_local *local = sdata->local; 3093 struct fq *fq = &local->fq; 3094 struct fq_tin *tin; 3095 struct fq_flow *flow; 3096 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3097 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3098 struct txq_info *txqi; 3099 struct sk_buff **frag_tail, *head; 3100 int subframe_len = skb->len - ETH_ALEN; 3101 u8 max_subframes = sta->sta.max_amsdu_subframes; 3102 int max_frags = local->hw.max_tx_fragments; 3103 int max_amsdu_len = sta->sta.max_amsdu_len; 3104 __be16 len; 3105 void *data; 3106 bool ret = false; 3107 unsigned int orig_len; 3108 int n = 1, nfrags; 3109 3110 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3111 return false; 3112 3113 if (!txq) 3114 return false; 3115 3116 txqi = to_txq_info(txq); 3117 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3118 return false; 3119 3120 if (sta->sta.max_rc_amsdu_len) 3121 max_amsdu_len = min_t(int, max_amsdu_len, 3122 sta->sta.max_rc_amsdu_len); 3123 3124 spin_lock_bh(&fq->lock); 3125 3126 /* TODO: Ideally aggregation should be done on dequeue to remain 3127 * responsive to environment changes. 3128 */ 3129 3130 tin = &txqi->tin; 3131 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3132 head = skb_peek_tail(&flow->queue); 3133 if (!head) 3134 goto out; 3135 3136 orig_len = head->len; 3137 3138 if (skb->len + head->len > max_amsdu_len) 3139 goto out; 3140 3141 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3142 goto out; 3143 3144 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3145 nfrags += 1 + skb_shinfo(head)->nr_frags; 3146 frag_tail = &skb_shinfo(head)->frag_list; 3147 while (*frag_tail) { 3148 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3149 frag_tail = &(*frag_tail)->next; 3150 n++; 3151 } 3152 3153 if (max_subframes && n > max_subframes) 3154 goto out; 3155 3156 if (max_frags && nfrags > max_frags) 3157 goto out; 3158 3159 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3160 &subframe_len)) 3161 goto out; 3162 3163 ret = true; 3164 data = skb_push(skb, ETH_ALEN + 2); 3165 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3166 3167 data += 2 * ETH_ALEN; 3168 len = cpu_to_be16(subframe_len); 3169 memcpy(data, &len, 2); 3170 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3171 3172 head->len += skb->len; 3173 head->data_len += skb->len; 3174 *frag_tail = skb; 3175 3176 flow->backlog += head->len - orig_len; 3177 tin->backlog_bytes += head->len - orig_len; 3178 3179 fq_recalc_backlog(fq, tin, flow); 3180 3181 out: 3182 spin_unlock_bh(&fq->lock); 3183 3184 return ret; 3185 } 3186 3187 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3188 struct net_device *dev, struct sta_info *sta, 3189 struct ieee80211_fast_tx *fast_tx, 3190 struct sk_buff *skb) 3191 { 3192 struct ieee80211_local *local = sdata->local; 3193 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3194 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3195 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3196 struct ethhdr eth; 3197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3198 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3199 struct ieee80211_tx_data tx; 3200 ieee80211_tx_result r; 3201 struct tid_ampdu_tx *tid_tx = NULL; 3202 u8 tid = IEEE80211_NUM_TIDS; 3203 3204 /* control port protocol needs a lot of special handling */ 3205 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3206 return false; 3207 3208 /* only RFC 1042 SNAP */ 3209 if (ethertype < ETH_P_802_3_MIN) 3210 return false; 3211 3212 /* don't handle TX status request here either */ 3213 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3214 return false; 3215 3216 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3217 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3218 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3219 if (tid_tx) { 3220 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3221 return false; 3222 if (tid_tx->timeout) 3223 tid_tx->last_tx = jiffies; 3224 } 3225 } 3226 3227 /* after this point (skb is modified) we cannot return false */ 3228 3229 if (skb_shared(skb)) { 3230 struct sk_buff *tmp_skb = skb; 3231 3232 skb = skb_clone(skb, GFP_ATOMIC); 3233 kfree_skb(tmp_skb); 3234 3235 if (!skb) 3236 return true; 3237 } 3238 3239 ieee80211_tx_stats(dev, skb->len + extra_head); 3240 3241 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3242 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3243 return true; 3244 3245 /* will not be crypto-handled beyond what we do here, so use false 3246 * as the may-encrypt argument for the resize to not account for 3247 * more room than we already have in 'extra_head' 3248 */ 3249 if (unlikely(ieee80211_skb_resize(sdata, skb, 3250 max_t(int, extra_head + hw_headroom - 3251 skb_headroom(skb), 0), 3252 false))) { 3253 kfree_skb(skb); 3254 return true; 3255 } 3256 3257 memcpy(ð, skb->data, ETH_HLEN - 2); 3258 hdr = (void *)skb_push(skb, extra_head); 3259 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3260 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3261 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3262 3263 memset(info, 0, sizeof(*info)); 3264 info->band = fast_tx->band; 3265 info->control.vif = &sdata->vif; 3266 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3267 IEEE80211_TX_CTL_DONTFRAG | 3268 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3269 3270 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3271 *ieee80211_get_qos_ctl(hdr) = tid; 3272 if (!ieee80211_get_txq(local, &sdata->vif, &sta->sta, skb)) 3273 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3274 } else { 3275 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3276 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3277 sdata->sequence_number += 0x10; 3278 } 3279 3280 if (skb_shinfo(skb)->gso_size) 3281 sta->tx_stats.msdu[tid] += 3282 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3283 else 3284 sta->tx_stats.msdu[tid]++; 3285 3286 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3287 3288 __skb_queue_head_init(&tx.skbs); 3289 3290 tx.flags = IEEE80211_TX_UNICAST; 3291 tx.local = local; 3292 tx.sdata = sdata; 3293 tx.sta = sta; 3294 tx.key = fast_tx->key; 3295 3296 if (fast_tx->key) 3297 info->control.hw_key = &fast_tx->key->conf; 3298 3299 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3300 tx.skb = skb; 3301 r = ieee80211_tx_h_rate_ctrl(&tx); 3302 skb = tx.skb; 3303 tx.skb = NULL; 3304 3305 if (r != TX_CONTINUE) { 3306 if (r != TX_QUEUED) 3307 kfree_skb(skb); 3308 return true; 3309 } 3310 } 3311 3312 /* statistics normally done by ieee80211_tx_h_stats (but that 3313 * has to consider fragmentation, so is more complex) 3314 */ 3315 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3316 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3317 3318 if (fast_tx->pn_offs) { 3319 u64 pn; 3320 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 3321 3322 switch (fast_tx->key->conf.cipher) { 3323 case WLAN_CIPHER_SUITE_CCMP: 3324 case WLAN_CIPHER_SUITE_CCMP_256: 3325 case WLAN_CIPHER_SUITE_GCMP: 3326 case WLAN_CIPHER_SUITE_GCMP_256: 3327 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 3328 crypto_hdr[0] = pn; 3329 crypto_hdr[1] = pn >> 8; 3330 crypto_hdr[4] = pn >> 16; 3331 crypto_hdr[5] = pn >> 24; 3332 crypto_hdr[6] = pn >> 32; 3333 crypto_hdr[7] = pn >> 40; 3334 break; 3335 } 3336 } 3337 3338 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3339 sdata = container_of(sdata->bss, 3340 struct ieee80211_sub_if_data, u.ap); 3341 3342 __skb_queue_tail(&tx.skbs, skb); 3343 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3344 return true; 3345 } 3346 3347 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3348 struct net_device *dev, 3349 u32 info_flags) 3350 { 3351 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3352 struct sta_info *sta; 3353 struct sk_buff *next; 3354 3355 if (unlikely(skb->len < ETH_HLEN)) { 3356 kfree_skb(skb); 3357 return; 3358 } 3359 3360 rcu_read_lock(); 3361 3362 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3363 goto out_free; 3364 3365 if (!IS_ERR_OR_NULL(sta)) { 3366 struct ieee80211_fast_tx *fast_tx; 3367 3368 fast_tx = rcu_dereference(sta->fast_tx); 3369 3370 if (fast_tx && 3371 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 3372 goto out; 3373 } 3374 3375 if (skb_is_gso(skb)) { 3376 struct sk_buff *segs; 3377 3378 segs = skb_gso_segment(skb, 0); 3379 if (IS_ERR(segs)) { 3380 goto out_free; 3381 } else if (segs) { 3382 consume_skb(skb); 3383 skb = segs; 3384 } 3385 } else { 3386 /* we cannot process non-linear frames on this path */ 3387 if (skb_linearize(skb)) { 3388 kfree_skb(skb); 3389 goto out; 3390 } 3391 3392 /* the frame could be fragmented, software-encrypted, and other 3393 * things so we cannot really handle checksum offload with it - 3394 * fix it up in software before we handle anything else. 3395 */ 3396 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3397 skb_set_transport_header(skb, 3398 skb_checksum_start_offset(skb)); 3399 if (skb_checksum_help(skb)) 3400 goto out_free; 3401 } 3402 } 3403 3404 next = skb; 3405 while (next) { 3406 skb = next; 3407 next = skb->next; 3408 3409 skb->prev = NULL; 3410 skb->next = NULL; 3411 3412 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3413 if (IS_ERR(skb)) 3414 goto out; 3415 3416 ieee80211_tx_stats(dev, skb->len); 3417 3418 ieee80211_xmit(sdata, sta, skb); 3419 } 3420 goto out; 3421 out_free: 3422 kfree_skb(skb); 3423 out: 3424 rcu_read_unlock(); 3425 } 3426 3427 /** 3428 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3429 * @skb: packet to be sent 3430 * @dev: incoming interface 3431 * 3432 * On failure skb will be freed. 3433 */ 3434 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3435 struct net_device *dev) 3436 { 3437 __ieee80211_subif_start_xmit(skb, dev, 0); 3438 return NETDEV_TX_OK; 3439 } 3440 3441 struct sk_buff * 3442 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3443 struct sk_buff *skb, u32 info_flags) 3444 { 3445 struct ieee80211_hdr *hdr; 3446 struct ieee80211_tx_data tx = { 3447 .local = sdata->local, 3448 .sdata = sdata, 3449 }; 3450 struct sta_info *sta; 3451 3452 rcu_read_lock(); 3453 3454 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3455 kfree_skb(skb); 3456 skb = ERR_PTR(-EINVAL); 3457 goto out; 3458 } 3459 3460 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3461 if (IS_ERR(skb)) 3462 goto out; 3463 3464 hdr = (void *)skb->data; 3465 tx.sta = sta_info_get(sdata, hdr->addr1); 3466 tx.skb = skb; 3467 3468 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3469 rcu_read_unlock(); 3470 kfree_skb(skb); 3471 return ERR_PTR(-EINVAL); 3472 } 3473 3474 out: 3475 rcu_read_unlock(); 3476 return skb; 3477 } 3478 3479 /* 3480 * ieee80211_clear_tx_pending may not be called in a context where 3481 * it is possible that it packets could come in again. 3482 */ 3483 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3484 { 3485 struct sk_buff *skb; 3486 int i; 3487 3488 for (i = 0; i < local->hw.queues; i++) { 3489 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3490 ieee80211_free_txskb(&local->hw, skb); 3491 } 3492 } 3493 3494 /* 3495 * Returns false if the frame couldn't be transmitted but was queued instead, 3496 * which in this case means re-queued -- take as an indication to stop sending 3497 * more pending frames. 3498 */ 3499 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3500 struct sk_buff *skb) 3501 { 3502 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3503 struct ieee80211_sub_if_data *sdata; 3504 struct sta_info *sta; 3505 struct ieee80211_hdr *hdr; 3506 bool result; 3507 struct ieee80211_chanctx_conf *chanctx_conf; 3508 3509 sdata = vif_to_sdata(info->control.vif); 3510 3511 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3512 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3513 if (unlikely(!chanctx_conf)) { 3514 dev_kfree_skb(skb); 3515 return true; 3516 } 3517 info->band = chanctx_conf->def.chan->band; 3518 result = ieee80211_tx(sdata, NULL, skb, true); 3519 } else { 3520 struct sk_buff_head skbs; 3521 3522 __skb_queue_head_init(&skbs); 3523 __skb_queue_tail(&skbs, skb); 3524 3525 hdr = (struct ieee80211_hdr *)skb->data; 3526 sta = sta_info_get(sdata, hdr->addr1); 3527 3528 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3529 } 3530 3531 return result; 3532 } 3533 3534 /* 3535 * Transmit all pending packets. Called from tasklet. 3536 */ 3537 void ieee80211_tx_pending(unsigned long data) 3538 { 3539 struct ieee80211_local *local = (struct ieee80211_local *)data; 3540 unsigned long flags; 3541 int i; 3542 bool txok; 3543 3544 rcu_read_lock(); 3545 3546 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3547 for (i = 0; i < local->hw.queues; i++) { 3548 /* 3549 * If queue is stopped by something other than due to pending 3550 * frames, or we have no pending frames, proceed to next queue. 3551 */ 3552 if (local->queue_stop_reasons[i] || 3553 skb_queue_empty(&local->pending[i])) 3554 continue; 3555 3556 while (!skb_queue_empty(&local->pending[i])) { 3557 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3558 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3559 3560 if (WARN_ON(!info->control.vif)) { 3561 ieee80211_free_txskb(&local->hw, skb); 3562 continue; 3563 } 3564 3565 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3566 flags); 3567 3568 txok = ieee80211_tx_pending_skb(local, skb); 3569 spin_lock_irqsave(&local->queue_stop_reason_lock, 3570 flags); 3571 if (!txok) 3572 break; 3573 } 3574 3575 if (skb_queue_empty(&local->pending[i])) 3576 ieee80211_propagate_queue_wake(local, i); 3577 } 3578 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3579 3580 rcu_read_unlock(); 3581 } 3582 3583 /* functions for drivers to get certain frames */ 3584 3585 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3586 struct ps_data *ps, struct sk_buff *skb, 3587 bool is_template) 3588 { 3589 u8 *pos, *tim; 3590 int aid0 = 0; 3591 int i, have_bits = 0, n1, n2; 3592 3593 /* Generate bitmap for TIM only if there are any STAs in power save 3594 * mode. */ 3595 if (atomic_read(&ps->num_sta_ps) > 0) 3596 /* in the hope that this is faster than 3597 * checking byte-for-byte */ 3598 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3599 IEEE80211_MAX_AID+1); 3600 if (!is_template) { 3601 if (ps->dtim_count == 0) 3602 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3603 else 3604 ps->dtim_count--; 3605 } 3606 3607 tim = pos = (u8 *) skb_put(skb, 6); 3608 *pos++ = WLAN_EID_TIM; 3609 *pos++ = 4; 3610 *pos++ = ps->dtim_count; 3611 *pos++ = sdata->vif.bss_conf.dtim_period; 3612 3613 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3614 aid0 = 1; 3615 3616 ps->dtim_bc_mc = aid0 == 1; 3617 3618 if (have_bits) { 3619 /* Find largest even number N1 so that bits numbered 1 through 3620 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3621 * (N2 + 1) x 8 through 2007 are 0. */ 3622 n1 = 0; 3623 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3624 if (ps->tim[i]) { 3625 n1 = i & 0xfe; 3626 break; 3627 } 3628 } 3629 n2 = n1; 3630 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3631 if (ps->tim[i]) { 3632 n2 = i; 3633 break; 3634 } 3635 } 3636 3637 /* Bitmap control */ 3638 *pos++ = n1 | aid0; 3639 /* Part Virt Bitmap */ 3640 skb_put(skb, n2 - n1); 3641 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3642 3643 tim[1] = n2 - n1 + 4; 3644 } else { 3645 *pos++ = aid0; /* Bitmap control */ 3646 *pos++ = 0; /* Part Virt Bitmap */ 3647 } 3648 } 3649 3650 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3651 struct ps_data *ps, struct sk_buff *skb, 3652 bool is_template) 3653 { 3654 struct ieee80211_local *local = sdata->local; 3655 3656 /* 3657 * Not very nice, but we want to allow the driver to call 3658 * ieee80211_beacon_get() as a response to the set_tim() 3659 * callback. That, however, is already invoked under the 3660 * sta_lock to guarantee consistent and race-free update 3661 * of the tim bitmap in mac80211 and the driver. 3662 */ 3663 if (local->tim_in_locked_section) { 3664 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3665 } else { 3666 spin_lock_bh(&local->tim_lock); 3667 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3668 spin_unlock_bh(&local->tim_lock); 3669 } 3670 3671 return 0; 3672 } 3673 3674 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3675 struct beacon_data *beacon) 3676 { 3677 struct probe_resp *resp; 3678 u8 *beacon_data; 3679 size_t beacon_data_len; 3680 int i; 3681 u8 count = beacon->csa_current_counter; 3682 3683 switch (sdata->vif.type) { 3684 case NL80211_IFTYPE_AP: 3685 beacon_data = beacon->tail; 3686 beacon_data_len = beacon->tail_len; 3687 break; 3688 case NL80211_IFTYPE_ADHOC: 3689 beacon_data = beacon->head; 3690 beacon_data_len = beacon->head_len; 3691 break; 3692 case NL80211_IFTYPE_MESH_POINT: 3693 beacon_data = beacon->head; 3694 beacon_data_len = beacon->head_len; 3695 break; 3696 default: 3697 return; 3698 } 3699 3700 rcu_read_lock(); 3701 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3702 resp = rcu_dereference(sdata->u.ap.probe_resp); 3703 3704 if (beacon->csa_counter_offsets[i]) { 3705 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3706 beacon_data_len)) { 3707 rcu_read_unlock(); 3708 return; 3709 } 3710 3711 beacon_data[beacon->csa_counter_offsets[i]] = count; 3712 } 3713 3714 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3715 resp->data[resp->csa_counter_offsets[i]] = count; 3716 } 3717 rcu_read_unlock(); 3718 } 3719 3720 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3721 { 3722 beacon->csa_current_counter--; 3723 3724 /* the counter should never reach 0 */ 3725 WARN_ON_ONCE(!beacon->csa_current_counter); 3726 3727 return beacon->csa_current_counter; 3728 } 3729 3730 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3731 { 3732 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3733 struct beacon_data *beacon = NULL; 3734 u8 count = 0; 3735 3736 rcu_read_lock(); 3737 3738 if (sdata->vif.type == NL80211_IFTYPE_AP) 3739 beacon = rcu_dereference(sdata->u.ap.beacon); 3740 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3741 beacon = rcu_dereference(sdata->u.ibss.presp); 3742 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3743 beacon = rcu_dereference(sdata->u.mesh.beacon); 3744 3745 if (!beacon) 3746 goto unlock; 3747 3748 count = __ieee80211_csa_update_counter(beacon); 3749 3750 unlock: 3751 rcu_read_unlock(); 3752 return count; 3753 } 3754 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3755 3756 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3757 { 3758 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3759 struct beacon_data *beacon = NULL; 3760 u8 *beacon_data; 3761 size_t beacon_data_len; 3762 int ret = false; 3763 3764 if (!ieee80211_sdata_running(sdata)) 3765 return false; 3766 3767 rcu_read_lock(); 3768 if (vif->type == NL80211_IFTYPE_AP) { 3769 struct ieee80211_if_ap *ap = &sdata->u.ap; 3770 3771 beacon = rcu_dereference(ap->beacon); 3772 if (WARN_ON(!beacon || !beacon->tail)) 3773 goto out; 3774 beacon_data = beacon->tail; 3775 beacon_data_len = beacon->tail_len; 3776 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3777 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3778 3779 beacon = rcu_dereference(ifibss->presp); 3780 if (!beacon) 3781 goto out; 3782 3783 beacon_data = beacon->head; 3784 beacon_data_len = beacon->head_len; 3785 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3786 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3787 3788 beacon = rcu_dereference(ifmsh->beacon); 3789 if (!beacon) 3790 goto out; 3791 3792 beacon_data = beacon->head; 3793 beacon_data_len = beacon->head_len; 3794 } else { 3795 WARN_ON(1); 3796 goto out; 3797 } 3798 3799 if (!beacon->csa_counter_offsets[0]) 3800 goto out; 3801 3802 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3803 goto out; 3804 3805 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3806 ret = true; 3807 out: 3808 rcu_read_unlock(); 3809 3810 return ret; 3811 } 3812 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3813 3814 static struct sk_buff * 3815 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3816 struct ieee80211_vif *vif, 3817 struct ieee80211_mutable_offsets *offs, 3818 bool is_template) 3819 { 3820 struct ieee80211_local *local = hw_to_local(hw); 3821 struct beacon_data *beacon = NULL; 3822 struct sk_buff *skb = NULL; 3823 struct ieee80211_tx_info *info; 3824 struct ieee80211_sub_if_data *sdata = NULL; 3825 enum nl80211_band band; 3826 struct ieee80211_tx_rate_control txrc; 3827 struct ieee80211_chanctx_conf *chanctx_conf; 3828 int csa_off_base = 0; 3829 3830 rcu_read_lock(); 3831 3832 sdata = vif_to_sdata(vif); 3833 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3834 3835 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3836 goto out; 3837 3838 if (offs) 3839 memset(offs, 0, sizeof(*offs)); 3840 3841 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3842 struct ieee80211_if_ap *ap = &sdata->u.ap; 3843 3844 beacon = rcu_dereference(ap->beacon); 3845 if (beacon) { 3846 if (beacon->csa_counter_offsets[0]) { 3847 if (!is_template) 3848 __ieee80211_csa_update_counter(beacon); 3849 3850 ieee80211_set_csa(sdata, beacon); 3851 } 3852 3853 /* 3854 * headroom, head length, 3855 * tail length and maximum TIM length 3856 */ 3857 skb = dev_alloc_skb(local->tx_headroom + 3858 beacon->head_len + 3859 beacon->tail_len + 256 + 3860 local->hw.extra_beacon_tailroom); 3861 if (!skb) 3862 goto out; 3863 3864 skb_reserve(skb, local->tx_headroom); 3865 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3866 beacon->head_len); 3867 3868 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3869 is_template); 3870 3871 if (offs) { 3872 offs->tim_offset = beacon->head_len; 3873 offs->tim_length = skb->len - beacon->head_len; 3874 3875 /* for AP the csa offsets are from tail */ 3876 csa_off_base = skb->len; 3877 } 3878 3879 if (beacon->tail) 3880 memcpy(skb_put(skb, beacon->tail_len), 3881 beacon->tail, beacon->tail_len); 3882 } else 3883 goto out; 3884 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3885 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3886 struct ieee80211_hdr *hdr; 3887 3888 beacon = rcu_dereference(ifibss->presp); 3889 if (!beacon) 3890 goto out; 3891 3892 if (beacon->csa_counter_offsets[0]) { 3893 if (!is_template) 3894 __ieee80211_csa_update_counter(beacon); 3895 3896 ieee80211_set_csa(sdata, beacon); 3897 } 3898 3899 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3900 local->hw.extra_beacon_tailroom); 3901 if (!skb) 3902 goto out; 3903 skb_reserve(skb, local->tx_headroom); 3904 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3905 beacon->head_len); 3906 3907 hdr = (struct ieee80211_hdr *) skb->data; 3908 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3909 IEEE80211_STYPE_BEACON); 3910 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3911 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3912 3913 beacon = rcu_dereference(ifmsh->beacon); 3914 if (!beacon) 3915 goto out; 3916 3917 if (beacon->csa_counter_offsets[0]) { 3918 if (!is_template) 3919 /* TODO: For mesh csa_counter is in TU, so 3920 * decrementing it by one isn't correct, but 3921 * for now we leave it consistent with overall 3922 * mac80211's behavior. 3923 */ 3924 __ieee80211_csa_update_counter(beacon); 3925 3926 ieee80211_set_csa(sdata, beacon); 3927 } 3928 3929 if (ifmsh->sync_ops) 3930 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3931 3932 skb = dev_alloc_skb(local->tx_headroom + 3933 beacon->head_len + 3934 256 + /* TIM IE */ 3935 beacon->tail_len + 3936 local->hw.extra_beacon_tailroom); 3937 if (!skb) 3938 goto out; 3939 skb_reserve(skb, local->tx_headroom); 3940 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3941 beacon->head_len); 3942 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3943 3944 if (offs) { 3945 offs->tim_offset = beacon->head_len; 3946 offs->tim_length = skb->len - beacon->head_len; 3947 } 3948 3949 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3950 beacon->tail_len); 3951 } else { 3952 WARN_ON(1); 3953 goto out; 3954 } 3955 3956 /* CSA offsets */ 3957 if (offs && beacon) { 3958 int i; 3959 3960 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3961 u16 csa_off = beacon->csa_counter_offsets[i]; 3962 3963 if (!csa_off) 3964 continue; 3965 3966 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3967 } 3968 } 3969 3970 band = chanctx_conf->def.chan->band; 3971 3972 info = IEEE80211_SKB_CB(skb); 3973 3974 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3975 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3976 info->band = band; 3977 3978 memset(&txrc, 0, sizeof(txrc)); 3979 txrc.hw = hw; 3980 txrc.sband = local->hw.wiphy->bands[band]; 3981 txrc.bss_conf = &sdata->vif.bss_conf; 3982 txrc.skb = skb; 3983 txrc.reported_rate.idx = -1; 3984 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3985 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3986 txrc.max_rate_idx = -1; 3987 else 3988 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3989 txrc.bss = true; 3990 rate_control_get_rate(sdata, NULL, &txrc); 3991 3992 info->control.vif = vif; 3993 3994 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3995 IEEE80211_TX_CTL_ASSIGN_SEQ | 3996 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3997 out: 3998 rcu_read_unlock(); 3999 return skb; 4000 4001 } 4002 4003 struct sk_buff * 4004 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4005 struct ieee80211_vif *vif, 4006 struct ieee80211_mutable_offsets *offs) 4007 { 4008 return __ieee80211_beacon_get(hw, vif, offs, true); 4009 } 4010 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4011 4012 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4013 struct ieee80211_vif *vif, 4014 u16 *tim_offset, u16 *tim_length) 4015 { 4016 struct ieee80211_mutable_offsets offs = {}; 4017 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4018 struct sk_buff *copy; 4019 struct ieee80211_supported_band *sband; 4020 int shift; 4021 4022 if (!bcn) 4023 return bcn; 4024 4025 if (tim_offset) 4026 *tim_offset = offs.tim_offset; 4027 4028 if (tim_length) 4029 *tim_length = offs.tim_length; 4030 4031 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4032 !hw_to_local(hw)->monitors) 4033 return bcn; 4034 4035 /* send a copy to monitor interfaces */ 4036 copy = skb_copy(bcn, GFP_ATOMIC); 4037 if (!copy) 4038 return bcn; 4039 4040 shift = ieee80211_vif_get_shift(vif); 4041 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 4042 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4043 4044 return bcn; 4045 } 4046 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4047 4048 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4049 struct ieee80211_vif *vif) 4050 { 4051 struct ieee80211_if_ap *ap = NULL; 4052 struct sk_buff *skb = NULL; 4053 struct probe_resp *presp = NULL; 4054 struct ieee80211_hdr *hdr; 4055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4056 4057 if (sdata->vif.type != NL80211_IFTYPE_AP) 4058 return NULL; 4059 4060 rcu_read_lock(); 4061 4062 ap = &sdata->u.ap; 4063 presp = rcu_dereference(ap->probe_resp); 4064 if (!presp) 4065 goto out; 4066 4067 skb = dev_alloc_skb(presp->len); 4068 if (!skb) 4069 goto out; 4070 4071 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4072 4073 hdr = (struct ieee80211_hdr *) skb->data; 4074 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4075 4076 out: 4077 rcu_read_unlock(); 4078 return skb; 4079 } 4080 EXPORT_SYMBOL(ieee80211_proberesp_get); 4081 4082 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4083 struct ieee80211_vif *vif) 4084 { 4085 struct ieee80211_sub_if_data *sdata; 4086 struct ieee80211_if_managed *ifmgd; 4087 struct ieee80211_pspoll *pspoll; 4088 struct ieee80211_local *local; 4089 struct sk_buff *skb; 4090 4091 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4092 return NULL; 4093 4094 sdata = vif_to_sdata(vif); 4095 ifmgd = &sdata->u.mgd; 4096 local = sdata->local; 4097 4098 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4099 if (!skb) 4100 return NULL; 4101 4102 skb_reserve(skb, local->hw.extra_tx_headroom); 4103 4104 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4105 memset(pspoll, 0, sizeof(*pspoll)); 4106 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4107 IEEE80211_STYPE_PSPOLL); 4108 pspoll->aid = cpu_to_le16(ifmgd->aid); 4109 4110 /* aid in PS-Poll has its two MSBs each set to 1 */ 4111 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4112 4113 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4114 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4115 4116 return skb; 4117 } 4118 EXPORT_SYMBOL(ieee80211_pspoll_get); 4119 4120 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4121 struct ieee80211_vif *vif) 4122 { 4123 struct ieee80211_hdr_3addr *nullfunc; 4124 struct ieee80211_sub_if_data *sdata; 4125 struct ieee80211_if_managed *ifmgd; 4126 struct ieee80211_local *local; 4127 struct sk_buff *skb; 4128 4129 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4130 return NULL; 4131 4132 sdata = vif_to_sdata(vif); 4133 ifmgd = &sdata->u.mgd; 4134 local = sdata->local; 4135 4136 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4137 if (!skb) 4138 return NULL; 4139 4140 skb_reserve(skb, local->hw.extra_tx_headroom); 4141 4142 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4143 sizeof(*nullfunc)); 4144 memset(nullfunc, 0, sizeof(*nullfunc)); 4145 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4146 IEEE80211_STYPE_NULLFUNC | 4147 IEEE80211_FCTL_TODS); 4148 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4149 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4150 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4151 4152 return skb; 4153 } 4154 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4155 4156 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4157 const u8 *src_addr, 4158 const u8 *ssid, size_t ssid_len, 4159 size_t tailroom) 4160 { 4161 struct ieee80211_local *local = hw_to_local(hw); 4162 struct ieee80211_hdr_3addr *hdr; 4163 struct sk_buff *skb; 4164 size_t ie_ssid_len; 4165 u8 *pos; 4166 4167 ie_ssid_len = 2 + ssid_len; 4168 4169 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4170 ie_ssid_len + tailroom); 4171 if (!skb) 4172 return NULL; 4173 4174 skb_reserve(skb, local->hw.extra_tx_headroom); 4175 4176 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4177 memset(hdr, 0, sizeof(*hdr)); 4178 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4179 IEEE80211_STYPE_PROBE_REQ); 4180 eth_broadcast_addr(hdr->addr1); 4181 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4182 eth_broadcast_addr(hdr->addr3); 4183 4184 pos = skb_put(skb, ie_ssid_len); 4185 *pos++ = WLAN_EID_SSID; 4186 *pos++ = ssid_len; 4187 if (ssid_len) 4188 memcpy(pos, ssid, ssid_len); 4189 pos += ssid_len; 4190 4191 return skb; 4192 } 4193 EXPORT_SYMBOL(ieee80211_probereq_get); 4194 4195 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4196 const void *frame, size_t frame_len, 4197 const struct ieee80211_tx_info *frame_txctl, 4198 struct ieee80211_rts *rts) 4199 { 4200 const struct ieee80211_hdr *hdr = frame; 4201 4202 rts->frame_control = 4203 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4204 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4205 frame_txctl); 4206 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4207 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4208 } 4209 EXPORT_SYMBOL(ieee80211_rts_get); 4210 4211 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4212 const void *frame, size_t frame_len, 4213 const struct ieee80211_tx_info *frame_txctl, 4214 struct ieee80211_cts *cts) 4215 { 4216 const struct ieee80211_hdr *hdr = frame; 4217 4218 cts->frame_control = 4219 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4220 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4221 frame_len, frame_txctl); 4222 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4223 } 4224 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4225 4226 struct sk_buff * 4227 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4228 struct ieee80211_vif *vif) 4229 { 4230 struct ieee80211_local *local = hw_to_local(hw); 4231 struct sk_buff *skb = NULL; 4232 struct ieee80211_tx_data tx; 4233 struct ieee80211_sub_if_data *sdata; 4234 struct ps_data *ps; 4235 struct ieee80211_tx_info *info; 4236 struct ieee80211_chanctx_conf *chanctx_conf; 4237 4238 sdata = vif_to_sdata(vif); 4239 4240 rcu_read_lock(); 4241 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4242 4243 if (!chanctx_conf) 4244 goto out; 4245 4246 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4247 struct beacon_data *beacon = 4248 rcu_dereference(sdata->u.ap.beacon); 4249 4250 if (!beacon || !beacon->head) 4251 goto out; 4252 4253 ps = &sdata->u.ap.ps; 4254 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4255 ps = &sdata->u.mesh.ps; 4256 } else { 4257 goto out; 4258 } 4259 4260 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4261 goto out; /* send buffered bc/mc only after DTIM beacon */ 4262 4263 while (1) { 4264 skb = skb_dequeue(&ps->bc_buf); 4265 if (!skb) 4266 goto out; 4267 local->total_ps_buffered--; 4268 4269 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4270 struct ieee80211_hdr *hdr = 4271 (struct ieee80211_hdr *) skb->data; 4272 /* more buffered multicast/broadcast frames ==> set 4273 * MoreData flag in IEEE 802.11 header to inform PS 4274 * STAs */ 4275 hdr->frame_control |= 4276 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4277 } 4278 4279 if (sdata->vif.type == NL80211_IFTYPE_AP) 4280 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4281 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4282 break; 4283 ieee80211_free_txskb(hw, skb); 4284 } 4285 4286 info = IEEE80211_SKB_CB(skb); 4287 4288 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4289 info->band = chanctx_conf->def.chan->band; 4290 4291 if (invoke_tx_handlers(&tx)) 4292 skb = NULL; 4293 out: 4294 rcu_read_unlock(); 4295 4296 return skb; 4297 } 4298 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4299 4300 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4301 { 4302 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4303 struct ieee80211_sub_if_data *sdata = sta->sdata; 4304 struct ieee80211_local *local = sdata->local; 4305 int ret; 4306 u32 queues; 4307 4308 lockdep_assert_held(&local->sta_mtx); 4309 4310 /* only some cases are supported right now */ 4311 switch (sdata->vif.type) { 4312 case NL80211_IFTYPE_STATION: 4313 case NL80211_IFTYPE_AP: 4314 case NL80211_IFTYPE_AP_VLAN: 4315 break; 4316 default: 4317 WARN_ON(1); 4318 return -EINVAL; 4319 } 4320 4321 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4322 return -EINVAL; 4323 4324 if (sta->reserved_tid == tid) { 4325 ret = 0; 4326 goto out; 4327 } 4328 4329 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4330 sdata_err(sdata, "TID reservation already active\n"); 4331 ret = -EALREADY; 4332 goto out; 4333 } 4334 4335 ieee80211_stop_vif_queues(sdata->local, sdata, 4336 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4337 4338 synchronize_net(); 4339 4340 /* Tear down BA sessions so we stop aggregating on this TID */ 4341 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4342 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4343 __ieee80211_stop_tx_ba_session(sta, tid, 4344 AGG_STOP_LOCAL_REQUEST); 4345 } 4346 4347 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4348 __ieee80211_flush_queues(local, sdata, queues, false); 4349 4350 sta->reserved_tid = tid; 4351 4352 ieee80211_wake_vif_queues(local, sdata, 4353 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4354 4355 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4356 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4357 4358 ret = 0; 4359 out: 4360 return ret; 4361 } 4362 EXPORT_SYMBOL(ieee80211_reserve_tid); 4363 4364 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4365 { 4366 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4367 struct ieee80211_sub_if_data *sdata = sta->sdata; 4368 4369 lockdep_assert_held(&sdata->local->sta_mtx); 4370 4371 /* only some cases are supported right now */ 4372 switch (sdata->vif.type) { 4373 case NL80211_IFTYPE_STATION: 4374 case NL80211_IFTYPE_AP: 4375 case NL80211_IFTYPE_AP_VLAN: 4376 break; 4377 default: 4378 WARN_ON(1); 4379 return; 4380 } 4381 4382 if (tid != sta->reserved_tid) { 4383 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4384 return; 4385 } 4386 4387 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4388 } 4389 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4390 4391 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4392 struct sk_buff *skb, int tid, 4393 enum nl80211_band band) 4394 { 4395 int ac = ieee802_1d_to_ac[tid & 7]; 4396 4397 skb_reset_mac_header(skb); 4398 skb_reset_network_header(skb); 4399 skb_reset_transport_header(skb); 4400 4401 skb_set_queue_mapping(skb, ac); 4402 skb->priority = tid; 4403 4404 skb->dev = sdata->dev; 4405 4406 /* 4407 * The other path calling ieee80211_xmit is from the tasklet, 4408 * and while we can handle concurrent transmissions locking 4409 * requirements are that we do not come into tx with bhs on. 4410 */ 4411 local_bh_disable(); 4412 IEEE80211_SKB_CB(skb)->band = band; 4413 ieee80211_xmit(sdata, NULL, skb); 4414 local_bh_enable(); 4415 } 4416