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(ieee80211_is_data(hdr->frame_control) && 335 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 336 /* 337 * No associated STAs - no need to send multicast 338 * frames. 339 */ 340 return TX_DROP; 341 } 342 343 return TX_CONTINUE; 344 } 345 346 /* This function is called whenever the AP is about to exceed the maximum limit 347 * of buffered frames for power saving STAs. This situation should not really 348 * happen often during normal operation, so dropping the oldest buffered packet 349 * from each queue should be OK to make some room for new frames. */ 350 static void purge_old_ps_buffers(struct ieee80211_local *local) 351 { 352 int total = 0, purged = 0; 353 struct sk_buff *skb; 354 struct ieee80211_sub_if_data *sdata; 355 struct sta_info *sta; 356 357 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 358 struct ps_data *ps; 359 360 if (sdata->vif.type == NL80211_IFTYPE_AP) 361 ps = &sdata->u.ap.ps; 362 else if (ieee80211_vif_is_mesh(&sdata->vif)) 363 ps = &sdata->u.mesh.ps; 364 else 365 continue; 366 367 skb = skb_dequeue(&ps->bc_buf); 368 if (skb) { 369 purged++; 370 ieee80211_free_txskb(&local->hw, skb); 371 } 372 total += skb_queue_len(&ps->bc_buf); 373 } 374 375 /* 376 * Drop one frame from each station from the lowest-priority 377 * AC that has frames at all. 378 */ 379 list_for_each_entry_rcu(sta, &local->sta_list, list) { 380 int ac; 381 382 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 383 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 384 total += skb_queue_len(&sta->ps_tx_buf[ac]); 385 if (skb) { 386 purged++; 387 ieee80211_free_txskb(&local->hw, skb); 388 break; 389 } 390 } 391 } 392 393 local->total_ps_buffered = total; 394 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 395 } 396 397 static ieee80211_tx_result 398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 399 { 400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 402 struct ps_data *ps; 403 404 /* 405 * broadcast/multicast frame 406 * 407 * If any of the associated/peer stations is in power save mode, 408 * the frame is buffered to be sent after DTIM beacon frame. 409 * This is done either by the hardware or us. 410 */ 411 412 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 413 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 414 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 415 if (!tx->sdata->bss) 416 return TX_CONTINUE; 417 418 ps = &tx->sdata->bss->ps; 419 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 420 ps = &tx->sdata->u.mesh.ps; 421 } else { 422 return TX_CONTINUE; 423 } 424 425 426 /* no buffering for ordered frames */ 427 if (ieee80211_has_order(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_is_probe_req(hdr->frame_control)) 431 return TX_CONTINUE; 432 433 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 434 info->hw_queue = tx->sdata->vif.cab_queue; 435 436 /* no stations in PS mode */ 437 if (!atomic_read(&ps->num_sta_ps)) 438 return TX_CONTINUE; 439 440 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 441 442 /* device releases frame after DTIM beacon */ 443 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 444 return TX_CONTINUE; 445 446 /* buffered in mac80211 */ 447 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 448 purge_old_ps_buffers(tx->local); 449 450 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 451 ps_dbg(tx->sdata, 452 "BC TX buffer full - dropping the oldest frame\n"); 453 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 454 } else 455 tx->local->total_ps_buffered++; 456 457 skb_queue_tail(&ps->bc_buf, tx->skb); 458 459 return TX_QUEUED; 460 } 461 462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 463 struct sk_buff *skb) 464 { 465 if (!ieee80211_is_mgmt(fc)) 466 return 0; 467 468 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 469 return 0; 470 471 if (!ieee80211_is_robust_mgmt_frame(skb)) 472 return 0; 473 474 return 1; 475 } 476 477 static ieee80211_tx_result 478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 479 { 480 struct sta_info *sta = tx->sta; 481 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 483 struct ieee80211_local *local = tx->local; 484 485 if (unlikely(!sta)) 486 return TX_CONTINUE; 487 488 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 489 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 490 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 491 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 492 int ac = skb_get_queue_mapping(tx->skb); 493 494 if (ieee80211_is_mgmt(hdr->frame_control) && 495 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 496 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 497 return TX_CONTINUE; 498 } 499 500 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 501 sta->sta.addr, sta->sta.aid, ac); 502 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 503 purge_old_ps_buffers(tx->local); 504 505 /* sync with ieee80211_sta_ps_deliver_wakeup */ 506 spin_lock(&sta->ps_lock); 507 /* 508 * STA woke up the meantime and all the frames on ps_tx_buf have 509 * been queued to pending queue. No reordering can happen, go 510 * ahead and Tx the packet. 511 */ 512 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 513 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 514 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 515 spin_unlock(&sta->ps_lock); 516 return TX_CONTINUE; 517 } 518 519 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 520 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 521 ps_dbg(tx->sdata, 522 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 523 sta->sta.addr, ac); 524 ieee80211_free_txskb(&local->hw, old); 525 } else 526 tx->local->total_ps_buffered++; 527 528 info->control.jiffies = jiffies; 529 info->control.vif = &tx->sdata->vif; 530 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 531 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 532 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 533 spin_unlock(&sta->ps_lock); 534 535 if (!timer_pending(&local->sta_cleanup)) 536 mod_timer(&local->sta_cleanup, 537 round_jiffies(jiffies + 538 STA_INFO_CLEANUP_INTERVAL)); 539 540 /* 541 * We queued up some frames, so the TIM bit might 542 * need to be set, recalculate it. 543 */ 544 sta_info_recalc_tim(sta); 545 546 return TX_QUEUED; 547 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 548 ps_dbg(tx->sdata, 549 "STA %pM in PS mode, but polling/in SP -> send frame\n", 550 sta->sta.addr); 551 } 552 553 return TX_CONTINUE; 554 } 555 556 static ieee80211_tx_result debug_noinline 557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 558 { 559 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 560 return TX_CONTINUE; 561 562 if (tx->flags & IEEE80211_TX_UNICAST) 563 return ieee80211_tx_h_unicast_ps_buf(tx); 564 else 565 return ieee80211_tx_h_multicast_ps_buf(tx); 566 } 567 568 static ieee80211_tx_result debug_noinline 569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 570 { 571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 572 573 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 574 if (tx->sdata->control_port_no_encrypt) 575 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 576 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 577 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 578 } 579 580 return TX_CONTINUE; 581 } 582 583 static ieee80211_tx_result debug_noinline 584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 585 { 586 struct ieee80211_key *key; 587 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 589 590 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 591 tx->key = NULL; 592 else if (tx->sta && 593 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 594 tx->key = key; 595 else if (ieee80211_is_group_privacy_action(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_multicast_key))) 597 tx->key = key; 598 else if (ieee80211_is_mgmt(hdr->frame_control) && 599 is_multicast_ether_addr(hdr->addr1) && 600 ieee80211_is_robust_mgmt_frame(tx->skb) && 601 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 602 tx->key = key; 603 else if (is_multicast_ether_addr(hdr->addr1) && 604 (key = rcu_dereference(tx->sdata->default_multicast_key))) 605 tx->key = key; 606 else if (!is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_unicast_key))) 608 tx->key = key; 609 else 610 tx->key = NULL; 611 612 if (tx->key) { 613 bool skip_hw = false; 614 615 /* TODO: add threshold stuff again */ 616 617 switch (tx->key->conf.cipher) { 618 case WLAN_CIPHER_SUITE_WEP40: 619 case WLAN_CIPHER_SUITE_WEP104: 620 case WLAN_CIPHER_SUITE_TKIP: 621 if (!ieee80211_is_data_present(hdr->frame_control)) 622 tx->key = NULL; 623 break; 624 case WLAN_CIPHER_SUITE_CCMP: 625 case WLAN_CIPHER_SUITE_CCMP_256: 626 case WLAN_CIPHER_SUITE_GCMP: 627 case WLAN_CIPHER_SUITE_GCMP_256: 628 if (!ieee80211_is_data_present(hdr->frame_control) && 629 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 630 tx->skb) && 631 !ieee80211_is_group_privacy_action(tx->skb)) 632 tx->key = NULL; 633 else 634 skip_hw = (tx->key->conf.flags & 635 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 636 ieee80211_is_mgmt(hdr->frame_control); 637 break; 638 case WLAN_CIPHER_SUITE_AES_CMAC: 639 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 642 if (!ieee80211_is_mgmt(hdr->frame_control)) 643 tx->key = NULL; 644 break; 645 } 646 647 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 648 !ieee80211_is_deauth(hdr->frame_control))) 649 return TX_DROP; 650 651 if (!skip_hw && tx->key && 652 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 653 info->control.hw_key = &tx->key->conf; 654 } 655 656 return TX_CONTINUE; 657 } 658 659 static ieee80211_tx_result debug_noinline 660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 661 { 662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 663 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 664 struct ieee80211_supported_band *sband; 665 u32 len; 666 struct ieee80211_tx_rate_control txrc; 667 struct ieee80211_sta_rates *ratetbl = NULL; 668 bool assoc = false; 669 670 memset(&txrc, 0, sizeof(txrc)); 671 672 sband = tx->local->hw.wiphy->bands[info->band]; 673 674 len = min_t(u32, tx->skb->len + FCS_LEN, 675 tx->local->hw.wiphy->frag_threshold); 676 677 /* set up the tx rate control struct we give the RC algo */ 678 txrc.hw = &tx->local->hw; 679 txrc.sband = sband; 680 txrc.bss_conf = &tx->sdata->vif.bss_conf; 681 txrc.skb = tx->skb; 682 txrc.reported_rate.idx = -1; 683 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 684 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 685 txrc.max_rate_idx = -1; 686 else 687 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 688 689 if (tx->sdata->rc_has_mcs_mask[info->band]) 690 txrc.rate_idx_mcs_mask = 691 tx->sdata->rc_rateidx_mcs_mask[info->band]; 692 693 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 694 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 695 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 696 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 697 698 /* set up RTS protection if desired */ 699 if (len > tx->local->hw.wiphy->rts_threshold) { 700 txrc.rts = true; 701 } 702 703 info->control.use_rts = txrc.rts; 704 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 705 706 /* 707 * Use short preamble if the BSS can handle it, but not for 708 * management frames unless we know the receiver can handle 709 * that -- the management frame might be to a station that 710 * just wants a probe response. 711 */ 712 if (tx->sdata->vif.bss_conf.use_short_preamble && 713 (ieee80211_is_data(hdr->frame_control) || 714 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 715 txrc.short_preamble = true; 716 717 info->control.short_preamble = txrc.short_preamble; 718 719 /* don't ask rate control when rate already injected via radiotap */ 720 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 721 return TX_CONTINUE; 722 723 if (tx->sta) 724 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 725 726 /* 727 * Lets not bother rate control if we're associated and cannot 728 * talk to the sta. This should not happen. 729 */ 730 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 731 !rate_usable_index_exists(sband, &tx->sta->sta), 732 "%s: Dropped data frame as no usable bitrate found while " 733 "scanning and associated. Target station: " 734 "%pM on %d GHz band\n", 735 tx->sdata->name, hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline 799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 u8 *qc; 804 int tid; 805 806 /* 807 * Packet injection may want to control the sequence 808 * number, if we have no matching interface then we 809 * neither assign one ourselves nor ask the driver to. 810 */ 811 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 812 return TX_CONTINUE; 813 814 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 815 return TX_CONTINUE; 816 817 if (ieee80211_hdrlen(hdr->frame_control) < 24) 818 return TX_CONTINUE; 819 820 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 821 return TX_CONTINUE; 822 823 /* 824 * Anything but QoS data that has a sequence number field 825 * (is long enough) gets a sequence number from the global 826 * counter. QoS data frames with a multicast destination 827 * also use the global counter (802.11-2012 9.3.2.10). 828 */ 829 if (!ieee80211_is_data_qos(hdr->frame_control) || 830 is_multicast_ether_addr(hdr->addr1)) { 831 /* driver should assign sequence number */ 832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 833 /* for pure STA mode without beacons, we can do it */ 834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 835 tx->sdata->sequence_number += 0x10; 836 if (tx->sta) 837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 838 return TX_CONTINUE; 839 } 840 841 /* 842 * This should be true for injected/management frames only, for 843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 844 * above since they are not QoS-data frames. 845 */ 846 if (!tx->sta) 847 return TX_CONTINUE; 848 849 /* include per-STA, per-TID sequence counter */ 850 851 qc = ieee80211_get_qos_ctl(hdr); 852 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 853 tx->sta->tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 tx->sdata->encrypt_headroom + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + tx->sdata->encrypt_headroom); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 910 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline 921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline 996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline 1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 default: 1043 return ieee80211_crypto_hw_encrypt(tx); 1044 } 1045 1046 return TX_DROP; 1047 } 1048 1049 static ieee80211_tx_result debug_noinline 1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1051 { 1052 struct sk_buff *skb; 1053 struct ieee80211_hdr *hdr; 1054 int next_len; 1055 bool group_addr; 1056 1057 skb_queue_walk(&tx->skbs, skb) { 1058 hdr = (void *) skb->data; 1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1060 break; /* must not overwrite AID */ 1061 if (!skb_queue_is_last(&tx->skbs, skb)) { 1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1063 next_len = next->len; 1064 } else 1065 next_len = 0; 1066 group_addr = is_multicast_ether_addr(hdr->addr1); 1067 1068 hdr->duration_id = 1069 ieee80211_duration(tx, skb, group_addr, next_len); 1070 } 1071 1072 return TX_CONTINUE; 1073 } 1074 1075 /* actual transmit path */ 1076 1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1078 struct sk_buff *skb, 1079 struct ieee80211_tx_info *info, 1080 struct tid_ampdu_tx *tid_tx, 1081 int tid) 1082 { 1083 bool queued = false; 1084 bool reset_agg_timer = false; 1085 struct sk_buff *purge_skb = NULL; 1086 1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1091 /* 1092 * nothing -- this aggregation session is being started 1093 * but that might still fail with the driver 1094 */ 1095 } else if (!tx->sta->sta.txq[tid]) { 1096 spin_lock(&tx->sta->lock); 1097 /* 1098 * Need to re-check now, because we may get here 1099 * 1100 * 1) in the window during which the setup is actually 1101 * already done, but not marked yet because not all 1102 * packets are spliced over to the driver pending 1103 * queue yet -- if this happened we acquire the lock 1104 * either before or after the splice happens, but 1105 * need to recheck which of these cases happened. 1106 * 1107 * 2) during session teardown, if the OPERATIONAL bit 1108 * was cleared due to the teardown but the pointer 1109 * hasn't been assigned NULL yet (or we loaded it 1110 * before it was assigned) -- in this case it may 1111 * now be NULL which means we should just let the 1112 * packet pass through because splicing the frames 1113 * back is already done. 1114 */ 1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1116 1117 if (!tid_tx) { 1118 /* do nothing, let packet pass through */ 1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 info->flags |= IEEE80211_TX_CTL_AMPDU; 1121 reset_agg_timer = true; 1122 } else { 1123 queued = true; 1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1125 clear_sta_flag(tx->sta, WLAN_STA_SP); 1126 ps_dbg(tx->sta->sdata, 1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1128 tx->sta->sta.addr, tx->sta->sta.aid); 1129 } 1130 info->control.vif = &tx->sdata->vif; 1131 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1133 __skb_queue_tail(&tid_tx->pending, skb); 1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1135 purge_skb = __skb_dequeue(&tid_tx->pending); 1136 } 1137 spin_unlock(&tx->sta->lock); 1138 1139 if (purge_skb) 1140 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1141 } 1142 1143 /* reset session timer */ 1144 if (reset_agg_timer && tid_tx->timeout) 1145 tid_tx->last_tx = jiffies; 1146 1147 return queued; 1148 } 1149 1150 /* 1151 * initialises @tx 1152 * pass %NULL for the station if unknown, a valid pointer if known 1153 * or an ERR_PTR() if the station is known not to exist 1154 */ 1155 static ieee80211_tx_result 1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1157 struct ieee80211_tx_data *tx, 1158 struct sta_info *sta, struct sk_buff *skb) 1159 { 1160 struct ieee80211_local *local = sdata->local; 1161 struct ieee80211_hdr *hdr; 1162 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1163 int tid; 1164 u8 *qc; 1165 1166 memset(tx, 0, sizeof(*tx)); 1167 tx->skb = skb; 1168 tx->local = local; 1169 tx->sdata = sdata; 1170 __skb_queue_head_init(&tx->skbs); 1171 1172 /* 1173 * If this flag is set to true anywhere, and we get here, 1174 * we are doing the needed processing, so remove the flag 1175 * now. 1176 */ 1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1178 1179 hdr = (struct ieee80211_hdr *) skb->data; 1180 1181 if (likely(sta)) { 1182 if (!IS_ERR(sta)) 1183 tx->sta = sta; 1184 } else { 1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1186 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1187 if (!tx->sta && sdata->wdev.use_4addr) 1188 return TX_DROP; 1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1190 IEEE80211_TX_CTL_INJECTED) || 1191 tx->sdata->control_port_protocol == tx->skb->protocol) { 1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1193 } 1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1195 tx->sta = sta_info_get(sdata, hdr->addr1); 1196 } 1197 1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1202 struct tid_ampdu_tx *tid_tx; 1203 1204 qc = ieee80211_get_qos_ctl(hdr); 1205 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1206 1207 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1208 if (tid_tx) { 1209 bool queued; 1210 1211 queued = ieee80211_tx_prep_agg(tx, skb, info, 1212 tid_tx, tid); 1213 1214 if (unlikely(queued)) 1215 return TX_QUEUED; 1216 } 1217 } 1218 1219 if (is_multicast_ether_addr(hdr->addr1)) { 1220 tx->flags &= ~IEEE80211_TX_UNICAST; 1221 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1222 } else 1223 tx->flags |= IEEE80211_TX_UNICAST; 1224 1225 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1226 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1227 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1228 info->flags & IEEE80211_TX_CTL_AMPDU) 1229 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1230 } 1231 1232 if (!tx->sta) 1233 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1234 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1236 ieee80211_check_fast_xmit(tx->sta); 1237 } 1238 1239 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1240 1241 return TX_CONTINUE; 1242 } 1243 1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1245 struct ieee80211_vif *vif, 1246 struct sta_info *sta, 1247 struct sk_buff *skb) 1248 { 1249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1251 struct ieee80211_txq *txq = NULL; 1252 1253 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1254 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1255 return NULL; 1256 1257 if (!ieee80211_is_data(hdr->frame_control)) 1258 return NULL; 1259 1260 if (sta) { 1261 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1262 1263 if (!sta->uploaded) 1264 return NULL; 1265 1266 txq = sta->sta.txq[tid]; 1267 } else if (vif) { 1268 txq = vif->txq; 1269 } 1270 1271 if (!txq) 1272 return NULL; 1273 1274 return to_txq_info(txq); 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 = &txqi->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 codel_stats_init(&txqi->cstats); 1408 __skb_queue_head_init(&txqi->frags); 1409 1410 txqi->txq.vif = &sdata->vif; 1411 1412 if (sta) { 1413 txqi->txq.sta = &sta->sta; 1414 sta->sta.txq[tid] = &txqi->txq; 1415 txqi->txq.tid = tid; 1416 txqi->txq.ac = ieee802_1d_to_ac[tid & 7]; 1417 } else { 1418 sdata->vif.txq = &txqi->txq; 1419 txqi->txq.tid = 0; 1420 txqi->txq.ac = IEEE80211_AC_BE; 1421 } 1422 } 1423 1424 void ieee80211_txq_purge(struct ieee80211_local *local, 1425 struct txq_info *txqi) 1426 { 1427 struct fq *fq = &local->fq; 1428 struct fq_tin *tin = &txqi->tin; 1429 1430 fq_tin_reset(fq, tin, fq_skb_free_func); 1431 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1432 } 1433 1434 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1435 { 1436 struct fq *fq = &local->fq; 1437 int ret; 1438 int i; 1439 bool supp_vht = false; 1440 enum nl80211_band band; 1441 1442 if (!local->ops->wake_tx_queue) 1443 return 0; 1444 1445 ret = fq_init(fq, 4096); 1446 if (ret) 1447 return ret; 1448 1449 /* 1450 * If the hardware doesn't support VHT, it is safe to limit the maximum 1451 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1452 */ 1453 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1454 struct ieee80211_supported_band *sband; 1455 1456 sband = local->hw.wiphy->bands[band]; 1457 if (!sband) 1458 continue; 1459 1460 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1461 } 1462 1463 if (!supp_vht) 1464 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1465 1466 codel_params_init(&local->cparams); 1467 local->cparams.interval = MS2TIME(100); 1468 local->cparams.target = MS2TIME(20); 1469 local->cparams.ecn = true; 1470 1471 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1472 GFP_KERNEL); 1473 if (!local->cvars) { 1474 spin_lock_bh(&fq->lock); 1475 fq_reset(fq, fq_skb_free_func); 1476 spin_unlock_bh(&fq->lock); 1477 return -ENOMEM; 1478 } 1479 1480 for (i = 0; i < fq->flows_cnt; i++) 1481 codel_vars_init(&local->cvars[i]); 1482 1483 return 0; 1484 } 1485 1486 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1487 { 1488 struct fq *fq = &local->fq; 1489 1490 if (!local->ops->wake_tx_queue) 1491 return; 1492 1493 kfree(local->cvars); 1494 local->cvars = NULL; 1495 1496 spin_lock_bh(&fq->lock); 1497 fq_reset(fq, fq_skb_free_func); 1498 spin_unlock_bh(&fq->lock); 1499 } 1500 1501 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1502 struct ieee80211_sub_if_data *sdata, 1503 struct sta_info *sta, 1504 struct sk_buff *skb) 1505 { 1506 struct fq *fq = &local->fq; 1507 struct ieee80211_vif *vif; 1508 struct txq_info *txqi; 1509 1510 if (!local->ops->wake_tx_queue || 1511 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1512 return false; 1513 1514 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1515 sdata = container_of(sdata->bss, 1516 struct ieee80211_sub_if_data, u.ap); 1517 1518 vif = &sdata->vif; 1519 txqi = ieee80211_get_txq(local, vif, sta, skb); 1520 1521 if (!txqi) 1522 return false; 1523 1524 spin_lock_bh(&fq->lock); 1525 ieee80211_txq_enqueue(local, txqi, skb); 1526 spin_unlock_bh(&fq->lock); 1527 1528 drv_wake_tx_queue(local, txqi); 1529 1530 return true; 1531 } 1532 1533 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1534 struct ieee80211_vif *vif, 1535 struct ieee80211_sta *sta, 1536 struct sk_buff_head *skbs, 1537 bool txpending) 1538 { 1539 struct ieee80211_tx_control control = {}; 1540 struct sk_buff *skb, *tmp; 1541 unsigned long flags; 1542 1543 skb_queue_walk_safe(skbs, skb, tmp) { 1544 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1545 int q = info->hw_queue; 1546 1547 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1548 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1549 __skb_unlink(skb, skbs); 1550 ieee80211_free_txskb(&local->hw, skb); 1551 continue; 1552 } 1553 #endif 1554 1555 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1556 if (local->queue_stop_reasons[q] || 1557 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1558 if (unlikely(info->flags & 1559 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1560 if (local->queue_stop_reasons[q] & 1561 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1562 /* 1563 * Drop off-channel frames if queues 1564 * are stopped for any reason other 1565 * than off-channel operation. Never 1566 * queue them. 1567 */ 1568 spin_unlock_irqrestore( 1569 &local->queue_stop_reason_lock, 1570 flags); 1571 ieee80211_purge_tx_queue(&local->hw, 1572 skbs); 1573 return true; 1574 } 1575 } else { 1576 1577 /* 1578 * Since queue is stopped, queue up frames for 1579 * later transmission from the tx-pending 1580 * tasklet when the queue is woken again. 1581 */ 1582 if (txpending) 1583 skb_queue_splice_init(skbs, 1584 &local->pending[q]); 1585 else 1586 skb_queue_splice_tail_init(skbs, 1587 &local->pending[q]); 1588 1589 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1590 flags); 1591 return false; 1592 } 1593 } 1594 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1595 1596 info->control.vif = vif; 1597 control.sta = sta; 1598 1599 __skb_unlink(skb, skbs); 1600 drv_tx(local, &control, skb); 1601 } 1602 1603 return true; 1604 } 1605 1606 /* 1607 * Returns false if the frame couldn't be transmitted but was queued instead. 1608 */ 1609 static bool __ieee80211_tx(struct ieee80211_local *local, 1610 struct sk_buff_head *skbs, int led_len, 1611 struct sta_info *sta, bool txpending) 1612 { 1613 struct ieee80211_tx_info *info; 1614 struct ieee80211_sub_if_data *sdata; 1615 struct ieee80211_vif *vif; 1616 struct ieee80211_sta *pubsta; 1617 struct sk_buff *skb; 1618 bool result = true; 1619 __le16 fc; 1620 1621 if (WARN_ON(skb_queue_empty(skbs))) 1622 return true; 1623 1624 skb = skb_peek(skbs); 1625 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1626 info = IEEE80211_SKB_CB(skb); 1627 sdata = vif_to_sdata(info->control.vif); 1628 if (sta && !sta->uploaded) 1629 sta = NULL; 1630 1631 if (sta) 1632 pubsta = &sta->sta; 1633 else 1634 pubsta = NULL; 1635 1636 switch (sdata->vif.type) { 1637 case NL80211_IFTYPE_MONITOR: 1638 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1639 vif = &sdata->vif; 1640 break; 1641 } 1642 sdata = rcu_dereference(local->monitor_sdata); 1643 if (sdata) { 1644 vif = &sdata->vif; 1645 info->hw_queue = 1646 vif->hw_queue[skb_get_queue_mapping(skb)]; 1647 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1648 ieee80211_purge_tx_queue(&local->hw, skbs); 1649 return true; 1650 } else 1651 vif = NULL; 1652 break; 1653 case NL80211_IFTYPE_AP_VLAN: 1654 sdata = container_of(sdata->bss, 1655 struct ieee80211_sub_if_data, u.ap); 1656 /* fall through */ 1657 default: 1658 vif = &sdata->vif; 1659 break; 1660 } 1661 1662 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1663 txpending); 1664 1665 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1666 1667 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1668 1669 return result; 1670 } 1671 1672 /* 1673 * Invoke TX handlers, return 0 on success and non-zero if the 1674 * frame was dropped or queued. 1675 * 1676 * The handlers are split into an early and late part. The latter is everything 1677 * that can be sensitive to reordering, and will be deferred to after packets 1678 * are dequeued from the intermediate queues (when they are enabled). 1679 */ 1680 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1681 { 1682 ieee80211_tx_result res = TX_DROP; 1683 1684 #define CALL_TXH(txh) \ 1685 do { \ 1686 res = txh(tx); \ 1687 if (res != TX_CONTINUE) \ 1688 goto txh_done; \ 1689 } while (0) 1690 1691 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1692 CALL_TXH(ieee80211_tx_h_check_assoc); 1693 CALL_TXH(ieee80211_tx_h_ps_buf); 1694 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1695 CALL_TXH(ieee80211_tx_h_select_key); 1696 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1697 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1698 1699 txh_done: 1700 if (unlikely(res == TX_DROP)) { 1701 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1702 if (tx->skb) 1703 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1704 else 1705 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1706 return -1; 1707 } else if (unlikely(res == TX_QUEUED)) { 1708 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1709 return -1; 1710 } 1711 1712 return 0; 1713 } 1714 1715 /* 1716 * Late handlers can be called while the sta lock is held. Handlers that can 1717 * cause packets to be generated will cause deadlock! 1718 */ 1719 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1720 { 1721 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1722 ieee80211_tx_result res = TX_CONTINUE; 1723 1724 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1725 __skb_queue_tail(&tx->skbs, tx->skb); 1726 tx->skb = NULL; 1727 goto txh_done; 1728 } 1729 1730 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1731 CALL_TXH(ieee80211_tx_h_sequence); 1732 CALL_TXH(ieee80211_tx_h_fragment); 1733 /* handlers after fragment must be aware of tx info fragmentation! */ 1734 CALL_TXH(ieee80211_tx_h_stats); 1735 CALL_TXH(ieee80211_tx_h_encrypt); 1736 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1737 CALL_TXH(ieee80211_tx_h_calculate_duration); 1738 #undef CALL_TXH 1739 1740 txh_done: 1741 if (unlikely(res == TX_DROP)) { 1742 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1743 if (tx->skb) 1744 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1745 else 1746 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1747 return -1; 1748 } else if (unlikely(res == TX_QUEUED)) { 1749 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1750 return -1; 1751 } 1752 1753 return 0; 1754 } 1755 1756 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1757 { 1758 int r = invoke_tx_handlers_early(tx); 1759 1760 if (r) 1761 return r; 1762 return invoke_tx_handlers_late(tx); 1763 } 1764 1765 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1766 struct ieee80211_vif *vif, struct sk_buff *skb, 1767 int band, struct ieee80211_sta **sta) 1768 { 1769 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1771 struct ieee80211_tx_data tx; 1772 struct sk_buff *skb2; 1773 1774 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1775 return false; 1776 1777 info->band = band; 1778 info->control.vif = vif; 1779 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1780 1781 if (invoke_tx_handlers(&tx)) 1782 return false; 1783 1784 if (sta) { 1785 if (tx.sta) 1786 *sta = &tx.sta->sta; 1787 else 1788 *sta = NULL; 1789 } 1790 1791 /* this function isn't suitable for fragmented data frames */ 1792 skb2 = __skb_dequeue(&tx.skbs); 1793 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1794 ieee80211_free_txskb(hw, skb2); 1795 ieee80211_purge_tx_queue(hw, &tx.skbs); 1796 return false; 1797 } 1798 1799 return true; 1800 } 1801 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1802 1803 /* 1804 * Returns false if the frame couldn't be transmitted but was queued instead. 1805 */ 1806 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1807 struct sta_info *sta, struct sk_buff *skb, 1808 bool txpending) 1809 { 1810 struct ieee80211_local *local = sdata->local; 1811 struct ieee80211_tx_data tx; 1812 ieee80211_tx_result res_prepare; 1813 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1814 bool result = true; 1815 int led_len; 1816 1817 if (unlikely(skb->len < 10)) { 1818 dev_kfree_skb(skb); 1819 return true; 1820 } 1821 1822 /* initialises tx */ 1823 led_len = skb->len; 1824 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1825 1826 if (unlikely(res_prepare == TX_DROP)) { 1827 ieee80211_free_txskb(&local->hw, skb); 1828 return true; 1829 } else if (unlikely(res_prepare == TX_QUEUED)) { 1830 return true; 1831 } 1832 1833 /* set up hw_queue value early */ 1834 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1835 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1836 info->hw_queue = 1837 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1838 1839 if (invoke_tx_handlers_early(&tx)) 1840 return false; 1841 1842 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1843 return true; 1844 1845 if (!invoke_tx_handlers_late(&tx)) 1846 result = __ieee80211_tx(local, &tx.skbs, led_len, 1847 tx.sta, txpending); 1848 1849 return result; 1850 } 1851 1852 /* device xmit handlers */ 1853 1854 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1855 struct sk_buff *skb, 1856 int head_need, bool may_encrypt) 1857 { 1858 struct ieee80211_local *local = sdata->local; 1859 int tail_need = 0; 1860 1861 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1862 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1863 tail_need -= skb_tailroom(skb); 1864 tail_need = max_t(int, tail_need, 0); 1865 } 1866 1867 if (skb_cloned(skb) && 1868 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1869 !skb_clone_writable(skb, ETH_HLEN) || 1870 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1871 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1872 else if (head_need || tail_need) 1873 I802_DEBUG_INC(local->tx_expand_skb_head); 1874 else 1875 return 0; 1876 1877 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1878 wiphy_debug(local->hw.wiphy, 1879 "failed to reallocate TX buffer\n"); 1880 return -ENOMEM; 1881 } 1882 1883 return 0; 1884 } 1885 1886 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1887 struct sta_info *sta, struct sk_buff *skb) 1888 { 1889 struct ieee80211_local *local = sdata->local; 1890 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1891 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1892 int headroom; 1893 bool may_encrypt; 1894 1895 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1896 1897 headroom = local->tx_headroom; 1898 if (may_encrypt) 1899 headroom += sdata->encrypt_headroom; 1900 headroom -= skb_headroom(skb); 1901 headroom = max_t(int, 0, headroom); 1902 1903 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1904 ieee80211_free_txskb(&local->hw, skb); 1905 return; 1906 } 1907 1908 hdr = (struct ieee80211_hdr *) skb->data; 1909 info->control.vif = &sdata->vif; 1910 1911 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1912 if (ieee80211_is_data(hdr->frame_control) && 1913 is_unicast_ether_addr(hdr->addr1)) { 1914 if (mesh_nexthop_resolve(sdata, skb)) 1915 return; /* skb queued: don't free */ 1916 } else { 1917 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1918 } 1919 } 1920 1921 ieee80211_set_qos_hdr(sdata, skb); 1922 ieee80211_tx(sdata, sta, skb, false); 1923 } 1924 1925 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1926 struct sk_buff *skb) 1927 { 1928 struct ieee80211_radiotap_iterator iterator; 1929 struct ieee80211_radiotap_header *rthdr = 1930 (struct ieee80211_radiotap_header *) skb->data; 1931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1932 struct ieee80211_supported_band *sband = 1933 local->hw.wiphy->bands[info->band]; 1934 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1935 NULL); 1936 u16 txflags; 1937 u16 rate = 0; 1938 bool rate_found = false; 1939 u8 rate_retries = 0; 1940 u16 rate_flags = 0; 1941 u8 mcs_known, mcs_flags, mcs_bw; 1942 u16 vht_known; 1943 u8 vht_mcs = 0, vht_nss = 0; 1944 int i; 1945 1946 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1947 IEEE80211_TX_CTL_DONTFRAG; 1948 1949 /* 1950 * for every radiotap entry that is present 1951 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1952 * entries present, or -EINVAL on error) 1953 */ 1954 1955 while (!ret) { 1956 ret = ieee80211_radiotap_iterator_next(&iterator); 1957 1958 if (ret) 1959 continue; 1960 1961 /* see if this argument is something we can use */ 1962 switch (iterator.this_arg_index) { 1963 /* 1964 * You must take care when dereferencing iterator.this_arg 1965 * for multibyte types... the pointer is not aligned. Use 1966 * get_unaligned((type *)iterator.this_arg) to dereference 1967 * iterator.this_arg for type "type" safely on all arches. 1968 */ 1969 case IEEE80211_RADIOTAP_FLAGS: 1970 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1971 /* 1972 * this indicates that the skb we have been 1973 * handed has the 32-bit FCS CRC at the end... 1974 * we should react to that by snipping it off 1975 * because it will be recomputed and added 1976 * on transmission 1977 */ 1978 if (skb->len < (iterator._max_length + FCS_LEN)) 1979 return false; 1980 1981 skb_trim(skb, skb->len - FCS_LEN); 1982 } 1983 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1984 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1985 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1986 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1987 break; 1988 1989 case IEEE80211_RADIOTAP_TX_FLAGS: 1990 txflags = get_unaligned_le16(iterator.this_arg); 1991 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1992 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1993 break; 1994 1995 case IEEE80211_RADIOTAP_RATE: 1996 rate = *iterator.this_arg; 1997 rate_flags = 0; 1998 rate_found = true; 1999 break; 2000 2001 case IEEE80211_RADIOTAP_DATA_RETRIES: 2002 rate_retries = *iterator.this_arg; 2003 break; 2004 2005 case IEEE80211_RADIOTAP_MCS: 2006 mcs_known = iterator.this_arg[0]; 2007 mcs_flags = iterator.this_arg[1]; 2008 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2009 break; 2010 2011 rate_found = true; 2012 rate = iterator.this_arg[2]; 2013 rate_flags = IEEE80211_TX_RC_MCS; 2014 2015 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2016 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2017 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2018 2019 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2020 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2021 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2022 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2023 break; 2024 2025 case IEEE80211_RADIOTAP_VHT: 2026 vht_known = get_unaligned_le16(iterator.this_arg); 2027 rate_found = true; 2028 2029 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2030 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2031 (iterator.this_arg[2] & 2032 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2033 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2034 if (vht_known & 2035 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2036 if (iterator.this_arg[3] == 1) 2037 rate_flags |= 2038 IEEE80211_TX_RC_40_MHZ_WIDTH; 2039 else if (iterator.this_arg[3] == 4) 2040 rate_flags |= 2041 IEEE80211_TX_RC_80_MHZ_WIDTH; 2042 else if (iterator.this_arg[3] == 11) 2043 rate_flags |= 2044 IEEE80211_TX_RC_160_MHZ_WIDTH; 2045 } 2046 2047 vht_mcs = iterator.this_arg[4] >> 4; 2048 vht_nss = iterator.this_arg[4] & 0xF; 2049 break; 2050 2051 /* 2052 * Please update the file 2053 * Documentation/networking/mac80211-injection.txt 2054 * when parsing new fields here. 2055 */ 2056 2057 default: 2058 break; 2059 } 2060 } 2061 2062 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2063 return false; 2064 2065 if (rate_found) { 2066 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2067 2068 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2069 info->control.rates[i].idx = -1; 2070 info->control.rates[i].flags = 0; 2071 info->control.rates[i].count = 0; 2072 } 2073 2074 if (rate_flags & IEEE80211_TX_RC_MCS) { 2075 info->control.rates[0].idx = rate; 2076 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2077 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2078 vht_nss); 2079 } else { 2080 for (i = 0; i < sband->n_bitrates; i++) { 2081 if (rate * 5 != sband->bitrates[i].bitrate) 2082 continue; 2083 2084 info->control.rates[0].idx = i; 2085 break; 2086 } 2087 } 2088 2089 if (info->control.rates[0].idx < 0) 2090 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2091 2092 info->control.rates[0].flags = rate_flags; 2093 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2094 local->hw.max_rate_tries); 2095 } 2096 2097 /* 2098 * remove the radiotap header 2099 * iterator->_max_length was sanity-checked against 2100 * skb->len by iterator init 2101 */ 2102 skb_pull(skb, iterator._max_length); 2103 2104 return true; 2105 } 2106 2107 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2108 struct net_device *dev) 2109 { 2110 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2111 struct ieee80211_chanctx_conf *chanctx_conf; 2112 struct ieee80211_radiotap_header *prthdr = 2113 (struct ieee80211_radiotap_header *)skb->data; 2114 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2115 struct ieee80211_hdr *hdr; 2116 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2117 struct cfg80211_chan_def *chandef; 2118 u16 len_rthdr; 2119 int hdrlen; 2120 2121 /* check for not even having the fixed radiotap header part */ 2122 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2123 goto fail; /* too short to be possibly valid */ 2124 2125 /* is it a header version we can trust to find length from? */ 2126 if (unlikely(prthdr->it_version)) 2127 goto fail; /* only version 0 is supported */ 2128 2129 /* then there must be a radiotap header with a length we can use */ 2130 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2131 2132 /* does the skb contain enough to deliver on the alleged length? */ 2133 if (unlikely(skb->len < len_rthdr)) 2134 goto fail; /* skb too short for claimed rt header extent */ 2135 2136 /* 2137 * fix up the pointers accounting for the radiotap 2138 * header still being in there. We are being given 2139 * a precooked IEEE80211 header so no need for 2140 * normal processing 2141 */ 2142 skb_set_mac_header(skb, len_rthdr); 2143 /* 2144 * these are just fixed to the end of the rt area since we 2145 * don't have any better information and at this point, nobody cares 2146 */ 2147 skb_set_network_header(skb, len_rthdr); 2148 skb_set_transport_header(skb, len_rthdr); 2149 2150 if (skb->len < len_rthdr + 2) 2151 goto fail; 2152 2153 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2154 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2155 2156 if (skb->len < len_rthdr + hdrlen) 2157 goto fail; 2158 2159 /* 2160 * Initialize skb->protocol if the injected frame is a data frame 2161 * carrying a rfc1042 header 2162 */ 2163 if (ieee80211_is_data(hdr->frame_control) && 2164 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2165 u8 *payload = (u8 *)hdr + hdrlen; 2166 2167 if (ether_addr_equal(payload, rfc1042_header)) 2168 skb->protocol = cpu_to_be16((payload[6] << 8) | 2169 payload[7]); 2170 } 2171 2172 memset(info, 0, sizeof(*info)); 2173 2174 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2175 IEEE80211_TX_CTL_INJECTED; 2176 2177 rcu_read_lock(); 2178 2179 /* 2180 * We process outgoing injected frames that have a local address 2181 * we handle as though they are non-injected frames. 2182 * This code here isn't entirely correct, the local MAC address 2183 * isn't always enough to find the interface to use; for proper 2184 * VLAN/WDS support we will need a different mechanism (which 2185 * likely isn't going to be monitor interfaces). 2186 */ 2187 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2188 2189 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2190 if (!ieee80211_sdata_running(tmp_sdata)) 2191 continue; 2192 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2193 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2194 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2195 continue; 2196 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2197 sdata = tmp_sdata; 2198 break; 2199 } 2200 } 2201 2202 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2203 if (!chanctx_conf) { 2204 tmp_sdata = rcu_dereference(local->monitor_sdata); 2205 if (tmp_sdata) 2206 chanctx_conf = 2207 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2208 } 2209 2210 if (chanctx_conf) 2211 chandef = &chanctx_conf->def; 2212 else if (!local->use_chanctx) 2213 chandef = &local->_oper_chandef; 2214 else 2215 goto fail_rcu; 2216 2217 /* 2218 * Frame injection is not allowed if beaconing is not allowed 2219 * or if we need radar detection. Beaconing is usually not allowed when 2220 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2221 * Passive scan is also used in world regulatory domains where 2222 * your country is not known and as such it should be treated as 2223 * NO TX unless the channel is explicitly allowed in which case 2224 * your current regulatory domain would not have the passive scan 2225 * flag. 2226 * 2227 * Since AP mode uses monitor interfaces to inject/TX management 2228 * frames we can make AP mode the exception to this rule once it 2229 * supports radar detection as its implementation can deal with 2230 * radar detection by itself. We can do that later by adding a 2231 * monitor flag interfaces used for AP support. 2232 */ 2233 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2234 sdata->vif.type)) 2235 goto fail_rcu; 2236 2237 info->band = chandef->chan->band; 2238 2239 /* process and remove the injection radiotap header */ 2240 if (!ieee80211_parse_tx_radiotap(local, skb)) 2241 goto fail_rcu; 2242 2243 ieee80211_xmit(sdata, NULL, skb); 2244 rcu_read_unlock(); 2245 2246 return NETDEV_TX_OK; 2247 2248 fail_rcu: 2249 rcu_read_unlock(); 2250 fail: 2251 dev_kfree_skb(skb); 2252 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2253 } 2254 2255 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2256 { 2257 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2258 2259 return ethertype == ETH_P_TDLS && 2260 skb->len > 14 && 2261 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2262 } 2263 2264 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2265 struct sk_buff *skb, 2266 struct sta_info **sta_out) 2267 { 2268 struct sta_info *sta; 2269 2270 switch (sdata->vif.type) { 2271 case NL80211_IFTYPE_AP_VLAN: 2272 sta = rcu_dereference(sdata->u.vlan.sta); 2273 if (sta) { 2274 *sta_out = sta; 2275 return 0; 2276 } else if (sdata->wdev.use_4addr) { 2277 return -ENOLINK; 2278 } 2279 /* fall through */ 2280 case NL80211_IFTYPE_AP: 2281 case NL80211_IFTYPE_OCB: 2282 case NL80211_IFTYPE_ADHOC: 2283 if (is_multicast_ether_addr(skb->data)) { 2284 *sta_out = ERR_PTR(-ENOENT); 2285 return 0; 2286 } 2287 sta = sta_info_get_bss(sdata, skb->data); 2288 break; 2289 case NL80211_IFTYPE_WDS: 2290 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2291 break; 2292 #ifdef CONFIG_MAC80211_MESH 2293 case NL80211_IFTYPE_MESH_POINT: 2294 /* determined much later */ 2295 *sta_out = NULL; 2296 return 0; 2297 #endif 2298 case NL80211_IFTYPE_STATION: 2299 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2300 sta = sta_info_get(sdata, skb->data); 2301 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2302 if (test_sta_flag(sta, 2303 WLAN_STA_TDLS_PEER_AUTH)) { 2304 *sta_out = sta; 2305 return 0; 2306 } 2307 2308 /* 2309 * TDLS link during setup - throw out frames to 2310 * peer. Allow TDLS-setup frames to unauthorized 2311 * peers for the special case of a link teardown 2312 * after a TDLS sta is removed due to being 2313 * unreachable. 2314 */ 2315 if (!ieee80211_is_tdls_setup(skb)) 2316 return -EINVAL; 2317 } 2318 2319 } 2320 2321 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2322 if (!sta) 2323 return -ENOLINK; 2324 break; 2325 default: 2326 return -EINVAL; 2327 } 2328 2329 *sta_out = sta ?: ERR_PTR(-ENOENT); 2330 return 0; 2331 } 2332 2333 /** 2334 * ieee80211_build_hdr - build 802.11 header in the given frame 2335 * @sdata: virtual interface to build the header for 2336 * @skb: the skb to build the header in 2337 * @info_flags: skb flags to set 2338 * 2339 * This function takes the skb with 802.3 header and reformats the header to 2340 * the appropriate IEEE 802.11 header based on which interface the packet is 2341 * being transmitted on. 2342 * 2343 * Note that this function also takes care of the TX status request and 2344 * potential unsharing of the SKB - this needs to be interleaved with the 2345 * header building. 2346 * 2347 * The function requires the read-side RCU lock held 2348 * 2349 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2350 */ 2351 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2352 struct sk_buff *skb, u32 info_flags, 2353 struct sta_info *sta) 2354 { 2355 struct ieee80211_local *local = sdata->local; 2356 struct ieee80211_tx_info *info; 2357 int head_need; 2358 u16 ethertype, hdrlen, meshhdrlen = 0; 2359 __le16 fc; 2360 struct ieee80211_hdr hdr; 2361 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2362 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2363 const u8 *encaps_data; 2364 int encaps_len, skip_header_bytes; 2365 bool wme_sta = false, authorized = false; 2366 bool tdls_peer; 2367 bool multicast; 2368 u16 info_id = 0; 2369 struct ieee80211_chanctx_conf *chanctx_conf; 2370 struct ieee80211_sub_if_data *ap_sdata; 2371 enum nl80211_band band; 2372 int ret; 2373 2374 if (IS_ERR(sta)) 2375 sta = NULL; 2376 2377 /* convert Ethernet header to proper 802.11 header (based on 2378 * operation mode) */ 2379 ethertype = (skb->data[12] << 8) | skb->data[13]; 2380 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2381 2382 switch (sdata->vif.type) { 2383 case NL80211_IFTYPE_AP_VLAN: 2384 if (sdata->wdev.use_4addr) { 2385 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2386 /* RA TA DA SA */ 2387 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2388 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2389 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2390 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2391 hdrlen = 30; 2392 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2393 wme_sta = sta->sta.wme; 2394 } 2395 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2396 u.ap); 2397 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2398 if (!chanctx_conf) { 2399 ret = -ENOTCONN; 2400 goto free; 2401 } 2402 band = chanctx_conf->def.chan->band; 2403 if (sdata->wdev.use_4addr) 2404 break; 2405 /* fall through */ 2406 case NL80211_IFTYPE_AP: 2407 if (sdata->vif.type == NL80211_IFTYPE_AP) 2408 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2409 if (!chanctx_conf) { 2410 ret = -ENOTCONN; 2411 goto free; 2412 } 2413 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2414 /* DA BSSID SA */ 2415 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2416 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2417 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2418 hdrlen = 24; 2419 band = chanctx_conf->def.chan->band; 2420 break; 2421 case NL80211_IFTYPE_WDS: 2422 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2423 /* RA TA DA SA */ 2424 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2425 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2426 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2427 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2428 hdrlen = 30; 2429 /* 2430 * This is the exception! WDS style interfaces are prohibited 2431 * when channel contexts are in used so this must be valid 2432 */ 2433 band = local->hw.conf.chandef.chan->band; 2434 break; 2435 #ifdef CONFIG_MAC80211_MESH 2436 case NL80211_IFTYPE_MESH_POINT: 2437 if (!is_multicast_ether_addr(skb->data)) { 2438 struct sta_info *next_hop; 2439 bool mpp_lookup = true; 2440 2441 mpath = mesh_path_lookup(sdata, skb->data); 2442 if (mpath) { 2443 mpp_lookup = false; 2444 next_hop = rcu_dereference(mpath->next_hop); 2445 if (!next_hop || 2446 !(mpath->flags & (MESH_PATH_ACTIVE | 2447 MESH_PATH_RESOLVING))) 2448 mpp_lookup = true; 2449 } 2450 2451 if (mpp_lookup) { 2452 mppath = mpp_path_lookup(sdata, skb->data); 2453 if (mppath) 2454 mppath->exp_time = jiffies; 2455 } 2456 2457 if (mppath && mpath) 2458 mesh_path_del(sdata, mpath->dst); 2459 } 2460 2461 /* 2462 * Use address extension if it is a packet from 2463 * another interface or if we know the destination 2464 * is being proxied by a portal (i.e. portal address 2465 * differs from proxied address) 2466 */ 2467 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2468 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2469 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2470 skb->data, skb->data + ETH_ALEN); 2471 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2472 NULL, NULL); 2473 } else { 2474 /* DS -> MBSS (802.11-2012 13.11.3.3). 2475 * For unicast with unknown forwarding information, 2476 * destination might be in the MBSS or if that fails 2477 * forwarded to another mesh gate. In either case 2478 * resolution will be handled in ieee80211_xmit(), so 2479 * leave the original DA. This also works for mcast */ 2480 const u8 *mesh_da = skb->data; 2481 2482 if (mppath) 2483 mesh_da = mppath->mpp; 2484 else if (mpath) 2485 mesh_da = mpath->dst; 2486 2487 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2488 mesh_da, sdata->vif.addr); 2489 if (is_multicast_ether_addr(mesh_da)) 2490 /* DA TA mSA AE:SA */ 2491 meshhdrlen = ieee80211_new_mesh_header( 2492 sdata, &mesh_hdr, 2493 skb->data + ETH_ALEN, NULL); 2494 else 2495 /* RA TA mDA mSA AE:DA SA */ 2496 meshhdrlen = ieee80211_new_mesh_header( 2497 sdata, &mesh_hdr, skb->data, 2498 skb->data + ETH_ALEN); 2499 2500 } 2501 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2502 if (!chanctx_conf) { 2503 ret = -ENOTCONN; 2504 goto free; 2505 } 2506 band = chanctx_conf->def.chan->band; 2507 break; 2508 #endif 2509 case NL80211_IFTYPE_STATION: 2510 /* we already did checks when looking up the RA STA */ 2511 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2512 2513 if (tdls_peer) { 2514 /* DA SA BSSID */ 2515 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2516 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2517 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2518 hdrlen = 24; 2519 } else if (sdata->u.mgd.use_4addr && 2520 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2521 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2522 IEEE80211_FCTL_TODS); 2523 /* RA TA DA SA */ 2524 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2525 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2526 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2527 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2528 hdrlen = 30; 2529 } else { 2530 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2531 /* BSSID SA DA */ 2532 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2533 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2534 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2535 hdrlen = 24; 2536 } 2537 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2538 if (!chanctx_conf) { 2539 ret = -ENOTCONN; 2540 goto free; 2541 } 2542 band = chanctx_conf->def.chan->band; 2543 break; 2544 case NL80211_IFTYPE_OCB: 2545 /* DA SA BSSID */ 2546 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2547 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2548 eth_broadcast_addr(hdr.addr3); 2549 hdrlen = 24; 2550 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2551 if (!chanctx_conf) { 2552 ret = -ENOTCONN; 2553 goto free; 2554 } 2555 band = chanctx_conf->def.chan->band; 2556 break; 2557 case NL80211_IFTYPE_ADHOC: 2558 /* DA SA BSSID */ 2559 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2560 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2561 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2562 hdrlen = 24; 2563 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2564 if (!chanctx_conf) { 2565 ret = -ENOTCONN; 2566 goto free; 2567 } 2568 band = chanctx_conf->def.chan->band; 2569 break; 2570 default: 2571 ret = -EINVAL; 2572 goto free; 2573 } 2574 2575 multicast = is_multicast_ether_addr(hdr.addr1); 2576 2577 /* sta is always NULL for mesh */ 2578 if (sta) { 2579 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2580 wme_sta = sta->sta.wme; 2581 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2582 /* For mesh, the use of the QoS header is mandatory */ 2583 wme_sta = true; 2584 } 2585 2586 /* receiver does QoS (which also means we do) use it */ 2587 if (wme_sta) { 2588 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2589 hdrlen += 2; 2590 } 2591 2592 /* 2593 * Drop unicast frames to unauthorised stations unless they are 2594 * EAPOL frames from the local station. 2595 */ 2596 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2597 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2598 !multicast && !authorized && 2599 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2600 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2601 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2602 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2603 sdata->name, hdr.addr1); 2604 #endif 2605 2606 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2607 2608 ret = -EPERM; 2609 goto free; 2610 } 2611 2612 if (unlikely(!multicast && skb->sk && 2613 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2614 struct sk_buff *ack_skb = skb_clone_sk(skb); 2615 2616 if (ack_skb) { 2617 unsigned long flags; 2618 int id; 2619 2620 spin_lock_irqsave(&local->ack_status_lock, flags); 2621 id = idr_alloc(&local->ack_status_frames, ack_skb, 2622 1, 0x10000, GFP_ATOMIC); 2623 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2624 2625 if (id >= 0) { 2626 info_id = id; 2627 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2628 } else { 2629 kfree_skb(ack_skb); 2630 } 2631 } 2632 } 2633 2634 /* 2635 * If the skb is shared we need to obtain our own copy. 2636 */ 2637 if (skb_shared(skb)) { 2638 struct sk_buff *tmp_skb = skb; 2639 2640 /* can't happen -- skb is a clone if info_id != 0 */ 2641 WARN_ON(info_id); 2642 2643 skb = skb_clone(skb, GFP_ATOMIC); 2644 kfree_skb(tmp_skb); 2645 2646 if (!skb) { 2647 ret = -ENOMEM; 2648 goto free; 2649 } 2650 } 2651 2652 hdr.frame_control = fc; 2653 hdr.duration_id = 0; 2654 hdr.seq_ctrl = 0; 2655 2656 skip_header_bytes = ETH_HLEN; 2657 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2658 encaps_data = bridge_tunnel_header; 2659 encaps_len = sizeof(bridge_tunnel_header); 2660 skip_header_bytes -= 2; 2661 } else if (ethertype >= ETH_P_802_3_MIN) { 2662 encaps_data = rfc1042_header; 2663 encaps_len = sizeof(rfc1042_header); 2664 skip_header_bytes -= 2; 2665 } else { 2666 encaps_data = NULL; 2667 encaps_len = 0; 2668 } 2669 2670 skb_pull(skb, skip_header_bytes); 2671 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2672 2673 /* 2674 * So we need to modify the skb header and hence need a copy of 2675 * that. The head_need variable above doesn't, so far, include 2676 * the needed header space that we don't need right away. If we 2677 * can, then we don't reallocate right now but only after the 2678 * frame arrives at the master device (if it does...) 2679 * 2680 * If we cannot, however, then we will reallocate to include all 2681 * the ever needed space. Also, if we need to reallocate it anyway, 2682 * make it big enough for everything we may ever need. 2683 */ 2684 2685 if (head_need > 0 || skb_cloned(skb)) { 2686 head_need += sdata->encrypt_headroom; 2687 head_need += local->tx_headroom; 2688 head_need = max_t(int, 0, head_need); 2689 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2690 ieee80211_free_txskb(&local->hw, skb); 2691 skb = NULL; 2692 return ERR_PTR(-ENOMEM); 2693 } 2694 } 2695 2696 if (encaps_data) 2697 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2698 2699 #ifdef CONFIG_MAC80211_MESH 2700 if (meshhdrlen > 0) 2701 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2702 #endif 2703 2704 if (ieee80211_is_data_qos(fc)) { 2705 __le16 *qos_control; 2706 2707 qos_control = (__le16 *) skb_push(skb, 2); 2708 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2709 /* 2710 * Maybe we could actually set some fields here, for now just 2711 * initialise to zero to indicate no special operation. 2712 */ 2713 *qos_control = 0; 2714 } else 2715 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2716 2717 skb_reset_mac_header(skb); 2718 2719 info = IEEE80211_SKB_CB(skb); 2720 memset(info, 0, sizeof(*info)); 2721 2722 info->flags = info_flags; 2723 info->ack_frame_id = info_id; 2724 info->band = band; 2725 2726 return skb; 2727 free: 2728 kfree_skb(skb); 2729 return ERR_PTR(ret); 2730 } 2731 2732 /* 2733 * fast-xmit overview 2734 * 2735 * The core idea of this fast-xmit is to remove per-packet checks by checking 2736 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2737 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2738 * much less work can be done per packet. For example, fragmentation must be 2739 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2740 * in the code here. 2741 * 2742 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2743 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2744 * 2745 * The most difficult part of this is that when any of these assumptions 2746 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2747 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2748 * since the per-packet code no longer checks the conditions. This is reflected 2749 * by the calls to these functions throughout the rest of the code, and must be 2750 * maintained if any of the TX path checks change. 2751 */ 2752 2753 void ieee80211_check_fast_xmit(struct sta_info *sta) 2754 { 2755 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2756 struct ieee80211_local *local = sta->local; 2757 struct ieee80211_sub_if_data *sdata = sta->sdata; 2758 struct ieee80211_hdr *hdr = (void *)build.hdr; 2759 struct ieee80211_chanctx_conf *chanctx_conf; 2760 __le16 fc; 2761 2762 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2763 return; 2764 2765 /* Locking here protects both the pointer itself, and against concurrent 2766 * invocations winning data access races to, e.g., the key pointer that 2767 * is used. 2768 * Without it, the invocation of this function right after the key 2769 * pointer changes wouldn't be sufficient, as another CPU could access 2770 * the pointer, then stall, and then do the cache update after the CPU 2771 * that invalidated the key. 2772 * With the locking, such scenarios cannot happen as the check for the 2773 * key and the fast-tx assignment are done atomically, so the CPU that 2774 * modifies the key will either wait or other one will see the key 2775 * cleared/changed already. 2776 */ 2777 spin_lock_bh(&sta->lock); 2778 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2779 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2780 sdata->vif.type == NL80211_IFTYPE_STATION) 2781 goto out; 2782 2783 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2784 goto out; 2785 2786 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2787 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2788 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2789 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2790 goto out; 2791 2792 if (sdata->noack_map) 2793 goto out; 2794 2795 /* fast-xmit doesn't handle fragmentation at all */ 2796 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2797 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2798 goto out; 2799 2800 rcu_read_lock(); 2801 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2802 if (!chanctx_conf) { 2803 rcu_read_unlock(); 2804 goto out; 2805 } 2806 build.band = chanctx_conf->def.chan->band; 2807 rcu_read_unlock(); 2808 2809 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2810 2811 switch (sdata->vif.type) { 2812 case NL80211_IFTYPE_ADHOC: 2813 /* DA SA BSSID */ 2814 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2815 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2816 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2817 build.hdr_len = 24; 2818 break; 2819 case NL80211_IFTYPE_STATION: 2820 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2821 /* DA SA BSSID */ 2822 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2823 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2824 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2825 build.hdr_len = 24; 2826 break; 2827 } 2828 2829 if (sdata->u.mgd.use_4addr) { 2830 /* non-regular ethertype cannot use the fastpath */ 2831 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2832 IEEE80211_FCTL_TODS); 2833 /* RA TA DA SA */ 2834 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2835 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2836 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2837 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2838 build.hdr_len = 30; 2839 break; 2840 } 2841 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2842 /* BSSID SA DA */ 2843 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2844 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2845 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2846 build.hdr_len = 24; 2847 break; 2848 case NL80211_IFTYPE_AP_VLAN: 2849 if (sdata->wdev.use_4addr) { 2850 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2851 IEEE80211_FCTL_TODS); 2852 /* RA TA DA SA */ 2853 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2854 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2855 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2856 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2857 build.hdr_len = 30; 2858 break; 2859 } 2860 /* fall through */ 2861 case NL80211_IFTYPE_AP: 2862 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2863 /* DA BSSID SA */ 2864 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2865 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2866 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2867 build.hdr_len = 24; 2868 break; 2869 default: 2870 /* not handled on fast-xmit */ 2871 goto out; 2872 } 2873 2874 if (sta->sta.wme) { 2875 build.hdr_len += 2; 2876 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2877 } 2878 2879 /* We store the key here so there's no point in using rcu_dereference() 2880 * but that's fine because the code that changes the pointers will call 2881 * this function after doing so. For a single CPU that would be enough, 2882 * for multiple see the comment above. 2883 */ 2884 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2885 if (!build.key) 2886 build.key = rcu_access_pointer(sdata->default_unicast_key); 2887 if (build.key) { 2888 bool gen_iv, iv_spc, mmic; 2889 2890 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2891 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2892 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2893 2894 /* don't handle software crypto */ 2895 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2896 goto out; 2897 2898 switch (build.key->conf.cipher) { 2899 case WLAN_CIPHER_SUITE_CCMP: 2900 case WLAN_CIPHER_SUITE_CCMP_256: 2901 /* add fixed key ID */ 2902 if (gen_iv) { 2903 (build.hdr + build.hdr_len)[3] = 2904 0x20 | (build.key->conf.keyidx << 6); 2905 build.pn_offs = build.hdr_len; 2906 } 2907 if (gen_iv || iv_spc) 2908 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2909 break; 2910 case WLAN_CIPHER_SUITE_GCMP: 2911 case WLAN_CIPHER_SUITE_GCMP_256: 2912 /* add fixed key ID */ 2913 if (gen_iv) { 2914 (build.hdr + build.hdr_len)[3] = 2915 0x20 | (build.key->conf.keyidx << 6); 2916 build.pn_offs = build.hdr_len; 2917 } 2918 if (gen_iv || iv_spc) 2919 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2920 break; 2921 case WLAN_CIPHER_SUITE_TKIP: 2922 /* cannot handle MMIC or IV generation in xmit-fast */ 2923 if (mmic || gen_iv) 2924 goto out; 2925 if (iv_spc) 2926 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2927 break; 2928 case WLAN_CIPHER_SUITE_WEP40: 2929 case WLAN_CIPHER_SUITE_WEP104: 2930 /* cannot handle IV generation in fast-xmit */ 2931 if (gen_iv) 2932 goto out; 2933 if (iv_spc) 2934 build.hdr_len += IEEE80211_WEP_IV_LEN; 2935 break; 2936 case WLAN_CIPHER_SUITE_AES_CMAC: 2937 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2938 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2939 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2940 WARN(1, 2941 "management cipher suite 0x%x enabled for data\n", 2942 build.key->conf.cipher); 2943 goto out; 2944 default: 2945 /* we don't know how to generate IVs for this at all */ 2946 if (WARN_ON(gen_iv)) 2947 goto out; 2948 /* pure hardware keys are OK, of course */ 2949 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2950 break; 2951 /* cipher scheme might require space allocation */ 2952 if (iv_spc && 2953 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2954 goto out; 2955 if (iv_spc) 2956 build.hdr_len += build.key->conf.iv_len; 2957 } 2958 2959 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2960 } 2961 2962 hdr->frame_control = fc; 2963 2964 memcpy(build.hdr + build.hdr_len, 2965 rfc1042_header, sizeof(rfc1042_header)); 2966 build.hdr_len += sizeof(rfc1042_header); 2967 2968 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2969 /* if the kmemdup fails, continue w/o fast_tx */ 2970 if (!fast_tx) 2971 goto out; 2972 2973 out: 2974 /* we might have raced against another call to this function */ 2975 old = rcu_dereference_protected(sta->fast_tx, 2976 lockdep_is_held(&sta->lock)); 2977 rcu_assign_pointer(sta->fast_tx, fast_tx); 2978 if (old) 2979 kfree_rcu(old, rcu_head); 2980 spin_unlock_bh(&sta->lock); 2981 } 2982 2983 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2984 { 2985 struct sta_info *sta; 2986 2987 rcu_read_lock(); 2988 list_for_each_entry_rcu(sta, &local->sta_list, list) 2989 ieee80211_check_fast_xmit(sta); 2990 rcu_read_unlock(); 2991 } 2992 2993 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2994 { 2995 struct ieee80211_local *local = sdata->local; 2996 struct sta_info *sta; 2997 2998 rcu_read_lock(); 2999 3000 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3001 if (sdata != sta->sdata && 3002 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3003 continue; 3004 ieee80211_check_fast_xmit(sta); 3005 } 3006 3007 rcu_read_unlock(); 3008 } 3009 3010 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3011 { 3012 struct ieee80211_fast_tx *fast_tx; 3013 3014 spin_lock_bh(&sta->lock); 3015 fast_tx = rcu_dereference_protected(sta->fast_tx, 3016 lockdep_is_held(&sta->lock)); 3017 RCU_INIT_POINTER(sta->fast_tx, NULL); 3018 spin_unlock_bh(&sta->lock); 3019 3020 if (fast_tx) 3021 kfree_rcu(fast_tx, rcu_head); 3022 } 3023 3024 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3025 struct sk_buff *skb, int headroom, 3026 int *subframe_len) 3027 { 3028 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3029 int padding = (4 - amsdu_len) & 3; 3030 3031 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3032 I802_DEBUG_INC(local->tx_expand_skb_head); 3033 3034 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3035 wiphy_debug(local->hw.wiphy, 3036 "failed to reallocate TX buffer\n"); 3037 return false; 3038 } 3039 } 3040 3041 if (padding) { 3042 *subframe_len += padding; 3043 memset(skb_put(skb, padding), 0, padding); 3044 } 3045 3046 return true; 3047 } 3048 3049 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3050 struct ieee80211_fast_tx *fast_tx, 3051 struct sk_buff *skb) 3052 { 3053 struct ieee80211_local *local = sdata->local; 3054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3055 struct ieee80211_hdr *hdr; 3056 struct ethhdr *amsdu_hdr; 3057 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3058 int subframe_len = skb->len - hdr_len; 3059 void *data; 3060 u8 *qc, *h_80211_src, *h_80211_dst; 3061 const u8 *bssid; 3062 3063 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3064 return false; 3065 3066 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3067 return true; 3068 3069 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3070 &subframe_len)) 3071 return false; 3072 3073 data = skb_push(skb, sizeof(*amsdu_hdr)); 3074 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3075 hdr = data; 3076 amsdu_hdr = data + hdr_len; 3077 /* h_80211_src/dst is addr* field within hdr */ 3078 h_80211_src = data + fast_tx->sa_offs; 3079 h_80211_dst = data + fast_tx->da_offs; 3080 3081 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3082 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3083 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3084 3085 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3086 * fields needs to be changed to BSSID for A-MSDU frames depending 3087 * on FromDS/ToDS values. 3088 */ 3089 switch (sdata->vif.type) { 3090 case NL80211_IFTYPE_STATION: 3091 bssid = sdata->u.mgd.bssid; 3092 break; 3093 case NL80211_IFTYPE_AP: 3094 case NL80211_IFTYPE_AP_VLAN: 3095 bssid = sdata->vif.addr; 3096 break; 3097 default: 3098 bssid = NULL; 3099 } 3100 3101 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3102 ether_addr_copy(h_80211_src, bssid); 3103 3104 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3105 ether_addr_copy(h_80211_dst, bssid); 3106 3107 qc = ieee80211_get_qos_ctl(hdr); 3108 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3109 3110 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3111 3112 return true; 3113 } 3114 3115 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3116 struct sta_info *sta, 3117 struct ieee80211_fast_tx *fast_tx, 3118 struct sk_buff *skb) 3119 { 3120 struct ieee80211_local *local = sdata->local; 3121 struct fq *fq = &local->fq; 3122 struct fq_tin *tin; 3123 struct fq_flow *flow; 3124 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3125 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3126 struct txq_info *txqi; 3127 struct sk_buff **frag_tail, *head; 3128 int subframe_len = skb->len - ETH_ALEN; 3129 u8 max_subframes = sta->sta.max_amsdu_subframes; 3130 int max_frags = local->hw.max_tx_fragments; 3131 int max_amsdu_len = sta->sta.max_amsdu_len; 3132 __be16 len; 3133 void *data; 3134 bool ret = false; 3135 unsigned int orig_len; 3136 int n = 1, nfrags; 3137 3138 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3139 return false; 3140 3141 if (!txq) 3142 return false; 3143 3144 txqi = to_txq_info(txq); 3145 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3146 return false; 3147 3148 if (sta->sta.max_rc_amsdu_len) 3149 max_amsdu_len = min_t(int, max_amsdu_len, 3150 sta->sta.max_rc_amsdu_len); 3151 3152 spin_lock_bh(&fq->lock); 3153 3154 /* TODO: Ideally aggregation should be done on dequeue to remain 3155 * responsive to environment changes. 3156 */ 3157 3158 tin = &txqi->tin; 3159 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3160 head = skb_peek_tail(&flow->queue); 3161 if (!head) 3162 goto out; 3163 3164 orig_len = head->len; 3165 3166 if (skb->len + head->len > max_amsdu_len) 3167 goto out; 3168 3169 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3170 goto out; 3171 3172 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3173 nfrags += 1 + skb_shinfo(head)->nr_frags; 3174 frag_tail = &skb_shinfo(head)->frag_list; 3175 while (*frag_tail) { 3176 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3177 frag_tail = &(*frag_tail)->next; 3178 n++; 3179 } 3180 3181 if (max_subframes && n > max_subframes) 3182 goto out; 3183 3184 if (max_frags && nfrags > max_frags) 3185 goto out; 3186 3187 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3188 &subframe_len)) 3189 goto out; 3190 3191 ret = true; 3192 data = skb_push(skb, ETH_ALEN + 2); 3193 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3194 3195 data += 2 * ETH_ALEN; 3196 len = cpu_to_be16(subframe_len); 3197 memcpy(data, &len, 2); 3198 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3199 3200 head->len += skb->len; 3201 head->data_len += skb->len; 3202 *frag_tail = skb; 3203 3204 flow->backlog += head->len - orig_len; 3205 tin->backlog_bytes += head->len - orig_len; 3206 3207 fq_recalc_backlog(fq, tin, flow); 3208 3209 out: 3210 spin_unlock_bh(&fq->lock); 3211 3212 return ret; 3213 } 3214 3215 /* 3216 * Can be called while the sta lock is held. Anything that can cause packets to 3217 * be generated will cause deadlock! 3218 */ 3219 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3220 struct sta_info *sta, u8 pn_offs, 3221 struct ieee80211_key *key, 3222 struct sk_buff *skb) 3223 { 3224 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3225 struct ieee80211_hdr *hdr = (void *)skb->data; 3226 u8 tid = IEEE80211_NUM_TIDS; 3227 3228 if (key) 3229 info->control.hw_key = &key->conf; 3230 3231 ieee80211_tx_stats(skb->dev, skb->len); 3232 3233 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3234 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3235 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3236 } else { 3237 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3238 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3239 sdata->sequence_number += 0x10; 3240 } 3241 3242 if (skb_shinfo(skb)->gso_size) 3243 sta->tx_stats.msdu[tid] += 3244 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3245 else 3246 sta->tx_stats.msdu[tid]++; 3247 3248 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3249 3250 /* statistics normally done by ieee80211_tx_h_stats (but that 3251 * has to consider fragmentation, so is more complex) 3252 */ 3253 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3254 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3255 3256 if (pn_offs) { 3257 u64 pn; 3258 u8 *crypto_hdr = skb->data + pn_offs; 3259 3260 switch (key->conf.cipher) { 3261 case WLAN_CIPHER_SUITE_CCMP: 3262 case WLAN_CIPHER_SUITE_CCMP_256: 3263 case WLAN_CIPHER_SUITE_GCMP: 3264 case WLAN_CIPHER_SUITE_GCMP_256: 3265 pn = atomic64_inc_return(&key->conf.tx_pn); 3266 crypto_hdr[0] = pn; 3267 crypto_hdr[1] = pn >> 8; 3268 crypto_hdr[4] = pn >> 16; 3269 crypto_hdr[5] = pn >> 24; 3270 crypto_hdr[6] = pn >> 32; 3271 crypto_hdr[7] = pn >> 40; 3272 break; 3273 } 3274 } 3275 } 3276 3277 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3278 struct sta_info *sta, 3279 struct ieee80211_fast_tx *fast_tx, 3280 struct sk_buff *skb) 3281 { 3282 struct ieee80211_local *local = sdata->local; 3283 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3284 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3285 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3286 struct ethhdr eth; 3287 struct ieee80211_tx_info *info; 3288 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3289 struct ieee80211_tx_data tx; 3290 ieee80211_tx_result r; 3291 struct tid_ampdu_tx *tid_tx = NULL; 3292 u8 tid = IEEE80211_NUM_TIDS; 3293 3294 /* control port protocol needs a lot of special handling */ 3295 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3296 return false; 3297 3298 /* only RFC 1042 SNAP */ 3299 if (ethertype < ETH_P_802_3_MIN) 3300 return false; 3301 3302 /* don't handle TX status request here either */ 3303 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3304 return false; 3305 3306 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3307 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3308 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3309 if (tid_tx) { 3310 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3311 return false; 3312 if (tid_tx->timeout) 3313 tid_tx->last_tx = jiffies; 3314 } 3315 } 3316 3317 /* after this point (skb is modified) we cannot return false */ 3318 3319 if (skb_shared(skb)) { 3320 struct sk_buff *tmp_skb = skb; 3321 3322 skb = skb_clone(skb, GFP_ATOMIC); 3323 kfree_skb(tmp_skb); 3324 3325 if (!skb) 3326 return true; 3327 } 3328 3329 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3330 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3331 return true; 3332 3333 /* will not be crypto-handled beyond what we do here, so use false 3334 * as the may-encrypt argument for the resize to not account for 3335 * more room than we already have in 'extra_head' 3336 */ 3337 if (unlikely(ieee80211_skb_resize(sdata, skb, 3338 max_t(int, extra_head + hw_headroom - 3339 skb_headroom(skb), 0), 3340 false))) { 3341 kfree_skb(skb); 3342 return true; 3343 } 3344 3345 memcpy(ð, skb->data, ETH_HLEN - 2); 3346 hdr = (void *)skb_push(skb, extra_head); 3347 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3348 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3349 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3350 3351 info = IEEE80211_SKB_CB(skb); 3352 memset(info, 0, sizeof(*info)); 3353 info->band = fast_tx->band; 3354 info->control.vif = &sdata->vif; 3355 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3356 IEEE80211_TX_CTL_DONTFRAG | 3357 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3358 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3359 3360 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3361 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3362 *ieee80211_get_qos_ctl(hdr) = tid; 3363 } 3364 3365 __skb_queue_head_init(&tx.skbs); 3366 3367 tx.flags = IEEE80211_TX_UNICAST; 3368 tx.local = local; 3369 tx.sdata = sdata; 3370 tx.sta = sta; 3371 tx.key = fast_tx->key; 3372 3373 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3374 tx.skb = skb; 3375 r = ieee80211_tx_h_rate_ctrl(&tx); 3376 skb = tx.skb; 3377 tx.skb = NULL; 3378 3379 if (r != TX_CONTINUE) { 3380 if (r != TX_QUEUED) 3381 kfree_skb(skb); 3382 return true; 3383 } 3384 } 3385 3386 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3387 return true; 3388 3389 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3390 fast_tx->key, skb); 3391 3392 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3393 sdata = container_of(sdata->bss, 3394 struct ieee80211_sub_if_data, u.ap); 3395 3396 __skb_queue_tail(&tx.skbs, skb); 3397 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3398 return true; 3399 } 3400 3401 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3402 struct ieee80211_txq *txq) 3403 { 3404 struct ieee80211_local *local = hw_to_local(hw); 3405 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3406 struct ieee80211_hdr *hdr; 3407 struct sk_buff *skb = NULL; 3408 struct fq *fq = &local->fq; 3409 struct fq_tin *tin = &txqi->tin; 3410 struct ieee80211_tx_info *info; 3411 struct ieee80211_tx_data tx; 3412 ieee80211_tx_result r; 3413 3414 spin_lock_bh(&fq->lock); 3415 3416 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3417 goto out; 3418 3419 /* Make sure fragments stay together. */ 3420 skb = __skb_dequeue(&txqi->frags); 3421 if (skb) 3422 goto out; 3423 3424 begin: 3425 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3426 if (!skb) 3427 goto out; 3428 3429 ieee80211_set_skb_vif(skb, txqi); 3430 3431 hdr = (struct ieee80211_hdr *)skb->data; 3432 info = IEEE80211_SKB_CB(skb); 3433 3434 memset(&tx, 0, sizeof(tx)); 3435 __skb_queue_head_init(&tx.skbs); 3436 tx.local = local; 3437 tx.skb = skb; 3438 tx.sdata = vif_to_sdata(info->control.vif); 3439 3440 if (txq->sta) 3441 tx.sta = container_of(txq->sta, struct sta_info, sta); 3442 3443 /* 3444 * The key can be removed while the packet was queued, so need to call 3445 * this here to get the current key. 3446 */ 3447 r = ieee80211_tx_h_select_key(&tx); 3448 if (r != TX_CONTINUE) { 3449 ieee80211_free_txskb(&local->hw, skb); 3450 goto begin; 3451 } 3452 3453 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3454 info->flags |= IEEE80211_TX_CTL_AMPDU; 3455 else 3456 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3457 3458 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3459 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3460 sta); 3461 u8 pn_offs = 0; 3462 3463 if (tx.key && 3464 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3465 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3466 3467 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3468 tx.key, skb); 3469 } else { 3470 if (invoke_tx_handlers_late(&tx)) 3471 goto begin; 3472 3473 skb = __skb_dequeue(&tx.skbs); 3474 3475 if (!skb_queue_empty(&tx.skbs)) 3476 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3477 } 3478 3479 if (skb && skb_has_frag_list(skb) && 3480 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3481 if (skb_linearize(skb)) { 3482 ieee80211_free_txskb(&local->hw, skb); 3483 goto begin; 3484 } 3485 } 3486 3487 out: 3488 spin_unlock_bh(&fq->lock); 3489 3490 return skb; 3491 } 3492 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3493 3494 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3495 struct net_device *dev, 3496 u32 info_flags) 3497 { 3498 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3499 struct sta_info *sta; 3500 struct sk_buff *next; 3501 3502 if (unlikely(skb->len < ETH_HLEN)) { 3503 kfree_skb(skb); 3504 return; 3505 } 3506 3507 rcu_read_lock(); 3508 3509 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3510 goto out_free; 3511 3512 if (!IS_ERR_OR_NULL(sta)) { 3513 struct ieee80211_fast_tx *fast_tx; 3514 3515 fast_tx = rcu_dereference(sta->fast_tx); 3516 3517 if (fast_tx && 3518 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3519 goto out; 3520 } 3521 3522 if (skb_is_gso(skb)) { 3523 struct sk_buff *segs; 3524 3525 segs = skb_gso_segment(skb, 0); 3526 if (IS_ERR(segs)) { 3527 goto out_free; 3528 } else if (segs) { 3529 consume_skb(skb); 3530 skb = segs; 3531 } 3532 } else { 3533 /* we cannot process non-linear frames on this path */ 3534 if (skb_linearize(skb)) { 3535 kfree_skb(skb); 3536 goto out; 3537 } 3538 3539 /* the frame could be fragmented, software-encrypted, and other 3540 * things so we cannot really handle checksum offload with it - 3541 * fix it up in software before we handle anything else. 3542 */ 3543 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3544 skb_set_transport_header(skb, 3545 skb_checksum_start_offset(skb)); 3546 if (skb_checksum_help(skb)) 3547 goto out_free; 3548 } 3549 } 3550 3551 next = skb; 3552 while (next) { 3553 skb = next; 3554 next = skb->next; 3555 3556 skb->prev = NULL; 3557 skb->next = NULL; 3558 3559 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3560 if (IS_ERR(skb)) 3561 goto out; 3562 3563 ieee80211_tx_stats(dev, skb->len); 3564 3565 ieee80211_xmit(sdata, sta, skb); 3566 } 3567 goto out; 3568 out_free: 3569 kfree_skb(skb); 3570 out: 3571 rcu_read_unlock(); 3572 } 3573 3574 /** 3575 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3576 * @skb: packet to be sent 3577 * @dev: incoming interface 3578 * 3579 * On failure skb will be freed. 3580 */ 3581 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3582 struct net_device *dev) 3583 { 3584 __ieee80211_subif_start_xmit(skb, dev, 0); 3585 return NETDEV_TX_OK; 3586 } 3587 3588 struct sk_buff * 3589 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3590 struct sk_buff *skb, u32 info_flags) 3591 { 3592 struct ieee80211_hdr *hdr; 3593 struct ieee80211_tx_data tx = { 3594 .local = sdata->local, 3595 .sdata = sdata, 3596 }; 3597 struct sta_info *sta; 3598 3599 rcu_read_lock(); 3600 3601 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3602 kfree_skb(skb); 3603 skb = ERR_PTR(-EINVAL); 3604 goto out; 3605 } 3606 3607 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3608 if (IS_ERR(skb)) 3609 goto out; 3610 3611 hdr = (void *)skb->data; 3612 tx.sta = sta_info_get(sdata, hdr->addr1); 3613 tx.skb = skb; 3614 3615 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3616 rcu_read_unlock(); 3617 kfree_skb(skb); 3618 return ERR_PTR(-EINVAL); 3619 } 3620 3621 out: 3622 rcu_read_unlock(); 3623 return skb; 3624 } 3625 3626 /* 3627 * ieee80211_clear_tx_pending may not be called in a context where 3628 * it is possible that it packets could come in again. 3629 */ 3630 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3631 { 3632 struct sk_buff *skb; 3633 int i; 3634 3635 for (i = 0; i < local->hw.queues; i++) { 3636 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3637 ieee80211_free_txskb(&local->hw, skb); 3638 } 3639 } 3640 3641 /* 3642 * Returns false if the frame couldn't be transmitted but was queued instead, 3643 * which in this case means re-queued -- take as an indication to stop sending 3644 * more pending frames. 3645 */ 3646 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3647 struct sk_buff *skb) 3648 { 3649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3650 struct ieee80211_sub_if_data *sdata; 3651 struct sta_info *sta; 3652 struct ieee80211_hdr *hdr; 3653 bool result; 3654 struct ieee80211_chanctx_conf *chanctx_conf; 3655 3656 sdata = vif_to_sdata(info->control.vif); 3657 3658 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3659 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3660 if (unlikely(!chanctx_conf)) { 3661 dev_kfree_skb(skb); 3662 return true; 3663 } 3664 info->band = chanctx_conf->def.chan->band; 3665 result = ieee80211_tx(sdata, NULL, skb, true); 3666 } else { 3667 struct sk_buff_head skbs; 3668 3669 __skb_queue_head_init(&skbs); 3670 __skb_queue_tail(&skbs, skb); 3671 3672 hdr = (struct ieee80211_hdr *)skb->data; 3673 sta = sta_info_get(sdata, hdr->addr1); 3674 3675 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3676 } 3677 3678 return result; 3679 } 3680 3681 /* 3682 * Transmit all pending packets. Called from tasklet. 3683 */ 3684 void ieee80211_tx_pending(unsigned long data) 3685 { 3686 struct ieee80211_local *local = (struct ieee80211_local *)data; 3687 unsigned long flags; 3688 int i; 3689 bool txok; 3690 3691 rcu_read_lock(); 3692 3693 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3694 for (i = 0; i < local->hw.queues; i++) { 3695 /* 3696 * If queue is stopped by something other than due to pending 3697 * frames, or we have no pending frames, proceed to next queue. 3698 */ 3699 if (local->queue_stop_reasons[i] || 3700 skb_queue_empty(&local->pending[i])) 3701 continue; 3702 3703 while (!skb_queue_empty(&local->pending[i])) { 3704 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3705 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3706 3707 if (WARN_ON(!info->control.vif)) { 3708 ieee80211_free_txskb(&local->hw, skb); 3709 continue; 3710 } 3711 3712 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3713 flags); 3714 3715 txok = ieee80211_tx_pending_skb(local, skb); 3716 spin_lock_irqsave(&local->queue_stop_reason_lock, 3717 flags); 3718 if (!txok) 3719 break; 3720 } 3721 3722 if (skb_queue_empty(&local->pending[i])) 3723 ieee80211_propagate_queue_wake(local, i); 3724 } 3725 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3726 3727 rcu_read_unlock(); 3728 } 3729 3730 /* functions for drivers to get certain frames */ 3731 3732 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3733 struct ps_data *ps, struct sk_buff *skb, 3734 bool is_template) 3735 { 3736 u8 *pos, *tim; 3737 int aid0 = 0; 3738 int i, have_bits = 0, n1, n2; 3739 3740 /* Generate bitmap for TIM only if there are any STAs in power save 3741 * mode. */ 3742 if (atomic_read(&ps->num_sta_ps) > 0) 3743 /* in the hope that this is faster than 3744 * checking byte-for-byte */ 3745 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3746 IEEE80211_MAX_AID+1); 3747 if (!is_template) { 3748 if (ps->dtim_count == 0) 3749 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3750 else 3751 ps->dtim_count--; 3752 } 3753 3754 tim = pos = (u8 *) skb_put(skb, 6); 3755 *pos++ = WLAN_EID_TIM; 3756 *pos++ = 4; 3757 *pos++ = ps->dtim_count; 3758 *pos++ = sdata->vif.bss_conf.dtim_period; 3759 3760 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3761 aid0 = 1; 3762 3763 ps->dtim_bc_mc = aid0 == 1; 3764 3765 if (have_bits) { 3766 /* Find largest even number N1 so that bits numbered 1 through 3767 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3768 * (N2 + 1) x 8 through 2007 are 0. */ 3769 n1 = 0; 3770 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3771 if (ps->tim[i]) { 3772 n1 = i & 0xfe; 3773 break; 3774 } 3775 } 3776 n2 = n1; 3777 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3778 if (ps->tim[i]) { 3779 n2 = i; 3780 break; 3781 } 3782 } 3783 3784 /* Bitmap control */ 3785 *pos++ = n1 | aid0; 3786 /* Part Virt Bitmap */ 3787 skb_put(skb, n2 - n1); 3788 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3789 3790 tim[1] = n2 - n1 + 4; 3791 } else { 3792 *pos++ = aid0; /* Bitmap control */ 3793 *pos++ = 0; /* Part Virt Bitmap */ 3794 } 3795 } 3796 3797 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3798 struct ps_data *ps, struct sk_buff *skb, 3799 bool is_template) 3800 { 3801 struct ieee80211_local *local = sdata->local; 3802 3803 /* 3804 * Not very nice, but we want to allow the driver to call 3805 * ieee80211_beacon_get() as a response to the set_tim() 3806 * callback. That, however, is already invoked under the 3807 * sta_lock to guarantee consistent and race-free update 3808 * of the tim bitmap in mac80211 and the driver. 3809 */ 3810 if (local->tim_in_locked_section) { 3811 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3812 } else { 3813 spin_lock_bh(&local->tim_lock); 3814 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3815 spin_unlock_bh(&local->tim_lock); 3816 } 3817 3818 return 0; 3819 } 3820 3821 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3822 struct beacon_data *beacon) 3823 { 3824 struct probe_resp *resp; 3825 u8 *beacon_data; 3826 size_t beacon_data_len; 3827 int i; 3828 u8 count = beacon->csa_current_counter; 3829 3830 switch (sdata->vif.type) { 3831 case NL80211_IFTYPE_AP: 3832 beacon_data = beacon->tail; 3833 beacon_data_len = beacon->tail_len; 3834 break; 3835 case NL80211_IFTYPE_ADHOC: 3836 beacon_data = beacon->head; 3837 beacon_data_len = beacon->head_len; 3838 break; 3839 case NL80211_IFTYPE_MESH_POINT: 3840 beacon_data = beacon->head; 3841 beacon_data_len = beacon->head_len; 3842 break; 3843 default: 3844 return; 3845 } 3846 3847 rcu_read_lock(); 3848 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3849 resp = rcu_dereference(sdata->u.ap.probe_resp); 3850 3851 if (beacon->csa_counter_offsets[i]) { 3852 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3853 beacon_data_len)) { 3854 rcu_read_unlock(); 3855 return; 3856 } 3857 3858 beacon_data[beacon->csa_counter_offsets[i]] = count; 3859 } 3860 3861 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3862 resp->data[resp->csa_counter_offsets[i]] = count; 3863 } 3864 rcu_read_unlock(); 3865 } 3866 3867 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3868 { 3869 beacon->csa_current_counter--; 3870 3871 /* the counter should never reach 0 */ 3872 WARN_ON_ONCE(!beacon->csa_current_counter); 3873 3874 return beacon->csa_current_counter; 3875 } 3876 3877 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3878 { 3879 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3880 struct beacon_data *beacon = NULL; 3881 u8 count = 0; 3882 3883 rcu_read_lock(); 3884 3885 if (sdata->vif.type == NL80211_IFTYPE_AP) 3886 beacon = rcu_dereference(sdata->u.ap.beacon); 3887 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3888 beacon = rcu_dereference(sdata->u.ibss.presp); 3889 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3890 beacon = rcu_dereference(sdata->u.mesh.beacon); 3891 3892 if (!beacon) 3893 goto unlock; 3894 3895 count = __ieee80211_csa_update_counter(beacon); 3896 3897 unlock: 3898 rcu_read_unlock(); 3899 return count; 3900 } 3901 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3902 3903 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3904 { 3905 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3906 struct beacon_data *beacon = NULL; 3907 u8 *beacon_data; 3908 size_t beacon_data_len; 3909 int ret = false; 3910 3911 if (!ieee80211_sdata_running(sdata)) 3912 return false; 3913 3914 rcu_read_lock(); 3915 if (vif->type == NL80211_IFTYPE_AP) { 3916 struct ieee80211_if_ap *ap = &sdata->u.ap; 3917 3918 beacon = rcu_dereference(ap->beacon); 3919 if (WARN_ON(!beacon || !beacon->tail)) 3920 goto out; 3921 beacon_data = beacon->tail; 3922 beacon_data_len = beacon->tail_len; 3923 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3924 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3925 3926 beacon = rcu_dereference(ifibss->presp); 3927 if (!beacon) 3928 goto out; 3929 3930 beacon_data = beacon->head; 3931 beacon_data_len = beacon->head_len; 3932 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3933 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3934 3935 beacon = rcu_dereference(ifmsh->beacon); 3936 if (!beacon) 3937 goto out; 3938 3939 beacon_data = beacon->head; 3940 beacon_data_len = beacon->head_len; 3941 } else { 3942 WARN_ON(1); 3943 goto out; 3944 } 3945 3946 if (!beacon->csa_counter_offsets[0]) 3947 goto out; 3948 3949 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3950 goto out; 3951 3952 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3953 ret = true; 3954 out: 3955 rcu_read_unlock(); 3956 3957 return ret; 3958 } 3959 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3960 3961 static struct sk_buff * 3962 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3963 struct ieee80211_vif *vif, 3964 struct ieee80211_mutable_offsets *offs, 3965 bool is_template) 3966 { 3967 struct ieee80211_local *local = hw_to_local(hw); 3968 struct beacon_data *beacon = NULL; 3969 struct sk_buff *skb = NULL; 3970 struct ieee80211_tx_info *info; 3971 struct ieee80211_sub_if_data *sdata = NULL; 3972 enum nl80211_band band; 3973 struct ieee80211_tx_rate_control txrc; 3974 struct ieee80211_chanctx_conf *chanctx_conf; 3975 int csa_off_base = 0; 3976 3977 rcu_read_lock(); 3978 3979 sdata = vif_to_sdata(vif); 3980 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3981 3982 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3983 goto out; 3984 3985 if (offs) 3986 memset(offs, 0, sizeof(*offs)); 3987 3988 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3989 struct ieee80211_if_ap *ap = &sdata->u.ap; 3990 3991 beacon = rcu_dereference(ap->beacon); 3992 if (beacon) { 3993 if (beacon->csa_counter_offsets[0]) { 3994 if (!is_template) 3995 __ieee80211_csa_update_counter(beacon); 3996 3997 ieee80211_set_csa(sdata, beacon); 3998 } 3999 4000 /* 4001 * headroom, head length, 4002 * tail length and maximum TIM length 4003 */ 4004 skb = dev_alloc_skb(local->tx_headroom + 4005 beacon->head_len + 4006 beacon->tail_len + 256 + 4007 local->hw.extra_beacon_tailroom); 4008 if (!skb) 4009 goto out; 4010 4011 skb_reserve(skb, local->tx_headroom); 4012 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4013 beacon->head_len); 4014 4015 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4016 is_template); 4017 4018 if (offs) { 4019 offs->tim_offset = beacon->head_len; 4020 offs->tim_length = skb->len - beacon->head_len; 4021 4022 /* for AP the csa offsets are from tail */ 4023 csa_off_base = skb->len; 4024 } 4025 4026 if (beacon->tail) 4027 memcpy(skb_put(skb, beacon->tail_len), 4028 beacon->tail, beacon->tail_len); 4029 } else 4030 goto out; 4031 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4032 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4033 struct ieee80211_hdr *hdr; 4034 4035 beacon = rcu_dereference(ifibss->presp); 4036 if (!beacon) 4037 goto out; 4038 4039 if (beacon->csa_counter_offsets[0]) { 4040 if (!is_template) 4041 __ieee80211_csa_update_counter(beacon); 4042 4043 ieee80211_set_csa(sdata, beacon); 4044 } 4045 4046 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4047 local->hw.extra_beacon_tailroom); 4048 if (!skb) 4049 goto out; 4050 skb_reserve(skb, local->tx_headroom); 4051 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4052 beacon->head_len); 4053 4054 hdr = (struct ieee80211_hdr *) skb->data; 4055 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4056 IEEE80211_STYPE_BEACON); 4057 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4058 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4059 4060 beacon = rcu_dereference(ifmsh->beacon); 4061 if (!beacon) 4062 goto out; 4063 4064 if (beacon->csa_counter_offsets[0]) { 4065 if (!is_template) 4066 /* TODO: For mesh csa_counter is in TU, so 4067 * decrementing it by one isn't correct, but 4068 * for now we leave it consistent with overall 4069 * mac80211's behavior. 4070 */ 4071 __ieee80211_csa_update_counter(beacon); 4072 4073 ieee80211_set_csa(sdata, beacon); 4074 } 4075 4076 if (ifmsh->sync_ops) 4077 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 4078 4079 skb = dev_alloc_skb(local->tx_headroom + 4080 beacon->head_len + 4081 256 + /* TIM IE */ 4082 beacon->tail_len + 4083 local->hw.extra_beacon_tailroom); 4084 if (!skb) 4085 goto out; 4086 skb_reserve(skb, local->tx_headroom); 4087 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4088 beacon->head_len); 4089 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4090 4091 if (offs) { 4092 offs->tim_offset = beacon->head_len; 4093 offs->tim_length = skb->len - beacon->head_len; 4094 } 4095 4096 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 4097 beacon->tail_len); 4098 } else { 4099 WARN_ON(1); 4100 goto out; 4101 } 4102 4103 /* CSA offsets */ 4104 if (offs && beacon) { 4105 int i; 4106 4107 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4108 u16 csa_off = beacon->csa_counter_offsets[i]; 4109 4110 if (!csa_off) 4111 continue; 4112 4113 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4114 } 4115 } 4116 4117 band = chanctx_conf->def.chan->band; 4118 4119 info = IEEE80211_SKB_CB(skb); 4120 4121 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4122 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4123 info->band = band; 4124 4125 memset(&txrc, 0, sizeof(txrc)); 4126 txrc.hw = hw; 4127 txrc.sband = local->hw.wiphy->bands[band]; 4128 txrc.bss_conf = &sdata->vif.bss_conf; 4129 txrc.skb = skb; 4130 txrc.reported_rate.idx = -1; 4131 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4132 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 4133 txrc.max_rate_idx = -1; 4134 else 4135 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 4136 txrc.bss = true; 4137 rate_control_get_rate(sdata, NULL, &txrc); 4138 4139 info->control.vif = vif; 4140 4141 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4142 IEEE80211_TX_CTL_ASSIGN_SEQ | 4143 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4144 out: 4145 rcu_read_unlock(); 4146 return skb; 4147 4148 } 4149 4150 struct sk_buff * 4151 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4152 struct ieee80211_vif *vif, 4153 struct ieee80211_mutable_offsets *offs) 4154 { 4155 return __ieee80211_beacon_get(hw, vif, offs, true); 4156 } 4157 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4158 4159 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4160 struct ieee80211_vif *vif, 4161 u16 *tim_offset, u16 *tim_length) 4162 { 4163 struct ieee80211_mutable_offsets offs = {}; 4164 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4165 struct sk_buff *copy; 4166 struct ieee80211_supported_band *sband; 4167 int shift; 4168 4169 if (!bcn) 4170 return bcn; 4171 4172 if (tim_offset) 4173 *tim_offset = offs.tim_offset; 4174 4175 if (tim_length) 4176 *tim_length = offs.tim_length; 4177 4178 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4179 !hw_to_local(hw)->monitors) 4180 return bcn; 4181 4182 /* send a copy to monitor interfaces */ 4183 copy = skb_copy(bcn, GFP_ATOMIC); 4184 if (!copy) 4185 return bcn; 4186 4187 shift = ieee80211_vif_get_shift(vif); 4188 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 4189 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4190 4191 return bcn; 4192 } 4193 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4194 4195 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4196 struct ieee80211_vif *vif) 4197 { 4198 struct ieee80211_if_ap *ap = NULL; 4199 struct sk_buff *skb = NULL; 4200 struct probe_resp *presp = NULL; 4201 struct ieee80211_hdr *hdr; 4202 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4203 4204 if (sdata->vif.type != NL80211_IFTYPE_AP) 4205 return NULL; 4206 4207 rcu_read_lock(); 4208 4209 ap = &sdata->u.ap; 4210 presp = rcu_dereference(ap->probe_resp); 4211 if (!presp) 4212 goto out; 4213 4214 skb = dev_alloc_skb(presp->len); 4215 if (!skb) 4216 goto out; 4217 4218 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4219 4220 hdr = (struct ieee80211_hdr *) skb->data; 4221 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4222 4223 out: 4224 rcu_read_unlock(); 4225 return skb; 4226 } 4227 EXPORT_SYMBOL(ieee80211_proberesp_get); 4228 4229 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4230 struct ieee80211_vif *vif) 4231 { 4232 struct ieee80211_sub_if_data *sdata; 4233 struct ieee80211_if_managed *ifmgd; 4234 struct ieee80211_pspoll *pspoll; 4235 struct ieee80211_local *local; 4236 struct sk_buff *skb; 4237 4238 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4239 return NULL; 4240 4241 sdata = vif_to_sdata(vif); 4242 ifmgd = &sdata->u.mgd; 4243 local = sdata->local; 4244 4245 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4246 if (!skb) 4247 return NULL; 4248 4249 skb_reserve(skb, local->hw.extra_tx_headroom); 4250 4251 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4252 memset(pspoll, 0, sizeof(*pspoll)); 4253 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4254 IEEE80211_STYPE_PSPOLL); 4255 pspoll->aid = cpu_to_le16(ifmgd->aid); 4256 4257 /* aid in PS-Poll has its two MSBs each set to 1 */ 4258 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4259 4260 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4261 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4262 4263 return skb; 4264 } 4265 EXPORT_SYMBOL(ieee80211_pspoll_get); 4266 4267 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4268 struct ieee80211_vif *vif) 4269 { 4270 struct ieee80211_hdr_3addr *nullfunc; 4271 struct ieee80211_sub_if_data *sdata; 4272 struct ieee80211_if_managed *ifmgd; 4273 struct ieee80211_local *local; 4274 struct sk_buff *skb; 4275 4276 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4277 return NULL; 4278 4279 sdata = vif_to_sdata(vif); 4280 ifmgd = &sdata->u.mgd; 4281 local = sdata->local; 4282 4283 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4284 if (!skb) 4285 return NULL; 4286 4287 skb_reserve(skb, local->hw.extra_tx_headroom); 4288 4289 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4290 sizeof(*nullfunc)); 4291 memset(nullfunc, 0, sizeof(*nullfunc)); 4292 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4293 IEEE80211_STYPE_NULLFUNC | 4294 IEEE80211_FCTL_TODS); 4295 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4296 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4297 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4298 4299 return skb; 4300 } 4301 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4302 4303 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4304 const u8 *src_addr, 4305 const u8 *ssid, size_t ssid_len, 4306 size_t tailroom) 4307 { 4308 struct ieee80211_local *local = hw_to_local(hw); 4309 struct ieee80211_hdr_3addr *hdr; 4310 struct sk_buff *skb; 4311 size_t ie_ssid_len; 4312 u8 *pos; 4313 4314 ie_ssid_len = 2 + ssid_len; 4315 4316 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4317 ie_ssid_len + tailroom); 4318 if (!skb) 4319 return NULL; 4320 4321 skb_reserve(skb, local->hw.extra_tx_headroom); 4322 4323 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4324 memset(hdr, 0, sizeof(*hdr)); 4325 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4326 IEEE80211_STYPE_PROBE_REQ); 4327 eth_broadcast_addr(hdr->addr1); 4328 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4329 eth_broadcast_addr(hdr->addr3); 4330 4331 pos = skb_put(skb, ie_ssid_len); 4332 *pos++ = WLAN_EID_SSID; 4333 *pos++ = ssid_len; 4334 if (ssid_len) 4335 memcpy(pos, ssid, ssid_len); 4336 pos += ssid_len; 4337 4338 return skb; 4339 } 4340 EXPORT_SYMBOL(ieee80211_probereq_get); 4341 4342 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4343 const void *frame, size_t frame_len, 4344 const struct ieee80211_tx_info *frame_txctl, 4345 struct ieee80211_rts *rts) 4346 { 4347 const struct ieee80211_hdr *hdr = frame; 4348 4349 rts->frame_control = 4350 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4351 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4352 frame_txctl); 4353 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4354 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4355 } 4356 EXPORT_SYMBOL(ieee80211_rts_get); 4357 4358 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4359 const void *frame, size_t frame_len, 4360 const struct ieee80211_tx_info *frame_txctl, 4361 struct ieee80211_cts *cts) 4362 { 4363 const struct ieee80211_hdr *hdr = frame; 4364 4365 cts->frame_control = 4366 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4367 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4368 frame_len, frame_txctl); 4369 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4370 } 4371 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4372 4373 struct sk_buff * 4374 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4375 struct ieee80211_vif *vif) 4376 { 4377 struct ieee80211_local *local = hw_to_local(hw); 4378 struct sk_buff *skb = NULL; 4379 struct ieee80211_tx_data tx; 4380 struct ieee80211_sub_if_data *sdata; 4381 struct ps_data *ps; 4382 struct ieee80211_tx_info *info; 4383 struct ieee80211_chanctx_conf *chanctx_conf; 4384 4385 sdata = vif_to_sdata(vif); 4386 4387 rcu_read_lock(); 4388 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4389 4390 if (!chanctx_conf) 4391 goto out; 4392 4393 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4394 struct beacon_data *beacon = 4395 rcu_dereference(sdata->u.ap.beacon); 4396 4397 if (!beacon || !beacon->head) 4398 goto out; 4399 4400 ps = &sdata->u.ap.ps; 4401 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4402 ps = &sdata->u.mesh.ps; 4403 } else { 4404 goto out; 4405 } 4406 4407 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4408 goto out; /* send buffered bc/mc only after DTIM beacon */ 4409 4410 while (1) { 4411 skb = skb_dequeue(&ps->bc_buf); 4412 if (!skb) 4413 goto out; 4414 local->total_ps_buffered--; 4415 4416 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4417 struct ieee80211_hdr *hdr = 4418 (struct ieee80211_hdr *) skb->data; 4419 /* more buffered multicast/broadcast frames ==> set 4420 * MoreData flag in IEEE 802.11 header to inform PS 4421 * STAs */ 4422 hdr->frame_control |= 4423 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4424 } 4425 4426 if (sdata->vif.type == NL80211_IFTYPE_AP) 4427 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4428 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4429 break; 4430 ieee80211_free_txskb(hw, skb); 4431 } 4432 4433 info = IEEE80211_SKB_CB(skb); 4434 4435 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4436 info->band = chanctx_conf->def.chan->band; 4437 4438 if (invoke_tx_handlers(&tx)) 4439 skb = NULL; 4440 out: 4441 rcu_read_unlock(); 4442 4443 return skb; 4444 } 4445 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4446 4447 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4448 { 4449 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4450 struct ieee80211_sub_if_data *sdata = sta->sdata; 4451 struct ieee80211_local *local = sdata->local; 4452 int ret; 4453 u32 queues; 4454 4455 lockdep_assert_held(&local->sta_mtx); 4456 4457 /* only some cases are supported right now */ 4458 switch (sdata->vif.type) { 4459 case NL80211_IFTYPE_STATION: 4460 case NL80211_IFTYPE_AP: 4461 case NL80211_IFTYPE_AP_VLAN: 4462 break; 4463 default: 4464 WARN_ON(1); 4465 return -EINVAL; 4466 } 4467 4468 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4469 return -EINVAL; 4470 4471 if (sta->reserved_tid == tid) { 4472 ret = 0; 4473 goto out; 4474 } 4475 4476 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4477 sdata_err(sdata, "TID reservation already active\n"); 4478 ret = -EALREADY; 4479 goto out; 4480 } 4481 4482 ieee80211_stop_vif_queues(sdata->local, sdata, 4483 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4484 4485 synchronize_net(); 4486 4487 /* Tear down BA sessions so we stop aggregating on this TID */ 4488 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4489 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4490 __ieee80211_stop_tx_ba_session(sta, tid, 4491 AGG_STOP_LOCAL_REQUEST); 4492 } 4493 4494 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4495 __ieee80211_flush_queues(local, sdata, queues, false); 4496 4497 sta->reserved_tid = tid; 4498 4499 ieee80211_wake_vif_queues(local, sdata, 4500 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4501 4502 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4503 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4504 4505 ret = 0; 4506 out: 4507 return ret; 4508 } 4509 EXPORT_SYMBOL(ieee80211_reserve_tid); 4510 4511 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4512 { 4513 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4514 struct ieee80211_sub_if_data *sdata = sta->sdata; 4515 4516 lockdep_assert_held(&sdata->local->sta_mtx); 4517 4518 /* only some cases are supported right now */ 4519 switch (sdata->vif.type) { 4520 case NL80211_IFTYPE_STATION: 4521 case NL80211_IFTYPE_AP: 4522 case NL80211_IFTYPE_AP_VLAN: 4523 break; 4524 default: 4525 WARN_ON(1); 4526 return; 4527 } 4528 4529 if (tid != sta->reserved_tid) { 4530 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4531 return; 4532 } 4533 4534 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4535 } 4536 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4537 4538 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4539 struct sk_buff *skb, int tid, 4540 enum nl80211_band band) 4541 { 4542 int ac = ieee802_1d_to_ac[tid & 7]; 4543 4544 skb_reset_mac_header(skb); 4545 skb_set_queue_mapping(skb, ac); 4546 skb->priority = tid; 4547 4548 skb->dev = sdata->dev; 4549 4550 /* 4551 * The other path calling ieee80211_xmit is from the tasklet, 4552 * and while we can handle concurrent transmissions locking 4553 * requirements are that we do not come into tx with bhs on. 4554 */ 4555 local_bh_disable(); 4556 IEEE80211_SKB_CB(skb)->band = band; 4557 ieee80211_xmit(sdata, NULL, skb); 4558 local_bh_enable(); 4559 } 4560