1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <net/codel.h> 28 #include <net/codel_impl.h> 29 #include <asm/unaligned.h> 30 #include <net/fq_impl.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 44 { 45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 46 47 u64_stats_update_begin(&tstats->syncp); 48 tstats->tx_packets++; 49 tstats->tx_bytes += len; 50 u64_stats_update_end(&tstats->syncp); 51 } 52 53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 54 struct sk_buff *skb, int group_addr, 55 int next_frag_len) 56 { 57 int rate, mrate, erp, dur, i, shift = 0; 58 struct ieee80211_rate *txrate; 59 struct ieee80211_local *local = tx->local; 60 struct ieee80211_supported_band *sband; 61 struct ieee80211_hdr *hdr; 62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 63 struct ieee80211_chanctx_conf *chanctx_conf; 64 u32 rate_flags = 0; 65 66 rcu_read_lock(); 67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 68 if (chanctx_conf) { 69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 71 } 72 rcu_read_unlock(); 73 74 /* assume HW handles this */ 75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 76 return 0; 77 78 /* uh huh? */ 79 if (WARN_ON_ONCE(tx->rate.idx < 0)) 80 return 0; 81 82 sband = local->hw.wiphy->bands[info->band]; 83 txrate = &sband->bitrates[tx->rate.idx]; 84 85 erp = txrate->flags & IEEE80211_RATE_ERP_G; 86 87 /* 88 * data and mgmt (except PS Poll): 89 * - during CFP: 32768 90 * - during contention period: 91 * if addr1 is group address: 0 92 * if more fragments = 0 and addr1 is individual address: time to 93 * transmit one ACK plus SIFS 94 * if more fragments = 1 and addr1 is individual address: time to 95 * transmit next fragment plus 2 x ACK plus 3 x SIFS 96 * 97 * IEEE 802.11, 9.6: 98 * - control response frame (CTS or ACK) shall be transmitted using the 99 * same rate as the immediately previous frame in the frame exchange 100 * sequence, if this rate belongs to the PHY mandatory rates, or else 101 * at the highest possible rate belonging to the PHY rates in the 102 * BSSBasicRateSet 103 */ 104 hdr = (struct ieee80211_hdr *)skb->data; 105 if (ieee80211_is_ctl(hdr->frame_control)) { 106 /* TODO: These control frames are not currently sent by 107 * mac80211, but should they be implemented, this function 108 * needs to be updated to support duration field calculation. 109 * 110 * RTS: time needed to transmit pending data/mgmt frame plus 111 * one CTS frame plus one ACK frame plus 3 x SIFS 112 * CTS: duration of immediately previous RTS minus time 113 * required to transmit CTS and its SIFS 114 * ACK: 0 if immediately previous directed data/mgmt had 115 * more=0, with more=1 duration in ACK frame is duration 116 * from previous frame minus time needed to transmit ACK 117 * and its SIFS 118 * PS Poll: BIT(15) | BIT(14) | aid 119 */ 120 return 0; 121 } 122 123 /* data/mgmt */ 124 if (0 /* FIX: data/mgmt during CFP */) 125 return cpu_to_le16(32768); 126 127 if (group_addr) /* Group address as the destination - no ACK */ 128 return 0; 129 130 /* Individual destination address: 131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 132 * CTS and ACK frames shall be transmitted using the highest rate in 133 * basic rate set that is less than or equal to the rate of the 134 * immediately previous frame and that is using the same modulation 135 * (CCK or OFDM). If no basic rate set matches with these requirements, 136 * the highest mandatory rate of the PHY that is less than or equal to 137 * the rate of the previous frame is used. 138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 139 */ 140 rate = -1; 141 /* use lowest available if everything fails */ 142 mrate = sband->bitrates[0].bitrate; 143 for (i = 0; i < sband->n_bitrates; i++) { 144 struct ieee80211_rate *r = &sband->bitrates[i]; 145 146 if (r->bitrate > txrate->bitrate) 147 break; 148 149 if ((rate_flags & r->flags) != rate_flags) 150 continue; 151 152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 154 155 switch (sband->band) { 156 case NL80211_BAND_2GHZ: { 157 u32 flag; 158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 159 flag = IEEE80211_RATE_MANDATORY_G; 160 else 161 flag = IEEE80211_RATE_MANDATORY_B; 162 if (r->flags & flag) 163 mrate = r->bitrate; 164 break; 165 } 166 case NL80211_BAND_5GHZ: 167 if (r->flags & IEEE80211_RATE_MANDATORY_A) 168 mrate = r->bitrate; 169 break; 170 case NL80211_BAND_60GHZ: 171 /* TODO, for now fall through */ 172 case NUM_NL80211_BANDS: 173 WARN_ON(1); 174 break; 175 } 176 } 177 if (rate == -1) { 178 /* No matching basic rate found; use highest suitable mandatory 179 * PHY rate */ 180 rate = DIV_ROUND_UP(mrate, 1 << shift); 181 } 182 183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 184 if (ieee80211_is_data_qos(hdr->frame_control) && 185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 186 dur = 0; 187 else 188 /* Time needed to transmit ACK 189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 190 * to closest integer */ 191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble, 193 shift); 194 195 if (next_frag_len) { 196 /* Frame is fragmented: duration increases with time needed to 197 * transmit next fragment plus ACK and 2 x SIFS. */ 198 dur *= 2; /* ACK + SIFS */ 199 /* next fragment */ 200 dur += ieee80211_frame_duration(sband->band, next_frag_len, 201 txrate->bitrate, erp, 202 tx->sdata->vif.bss_conf.use_short_preamble, 203 shift); 204 } 205 206 return cpu_to_le16(dur); 207 } 208 209 /* tx handlers */ 210 static ieee80211_tx_result debug_noinline 211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 212 { 213 struct ieee80211_local *local = tx->local; 214 struct ieee80211_if_managed *ifmgd; 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 335 ieee80211_is_data(hdr->frame_control) && 336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 ieee80211_free_txskb(&local->hw, skb); 372 } 373 total += skb_queue_len(&ps->bc_buf); 374 } 375 376 /* 377 * Drop one frame from each station from the lowest-priority 378 * AC that has frames at all. 379 */ 380 list_for_each_entry_rcu(sta, &local->sta_list, list) { 381 int ac; 382 383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 384 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 385 total += skb_queue_len(&sta->ps_tx_buf[ac]); 386 if (skb) { 387 purged++; 388 ieee80211_free_txskb(&local->hw, skb); 389 break; 390 } 391 } 392 } 393 394 local->total_ps_buffered = total; 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 396 } 397 398 static ieee80211_tx_result 399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 400 { 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 403 struct ps_data *ps; 404 405 /* 406 * broadcast/multicast frame 407 * 408 * If any of the associated/peer stations is in power save mode, 409 * the frame is buffered to be sent after DTIM beacon frame. 410 * This is done either by the hardware or us. 411 */ 412 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 416 if (!tx->sdata->bss) 417 return TX_CONTINUE; 418 419 ps = &tx->sdata->bss->ps; 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 421 ps = &tx->sdata->u.mesh.ps; 422 } else { 423 return TX_CONTINUE; 424 } 425 426 427 /* no buffering for ordered frames */ 428 if (ieee80211_has_order(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_is_probe_req(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 435 info->hw_queue = tx->sdata->vif.cab_queue; 436 437 /* no stations in PS mode */ 438 if (!atomic_read(&ps->num_sta_ps)) 439 return TX_CONTINUE; 440 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 442 443 /* device releases frame after DTIM beacon */ 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 445 return TX_CONTINUE; 446 447 /* buffered in mac80211 */ 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 449 purge_old_ps_buffers(tx->local); 450 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 452 ps_dbg(tx->sdata, 453 "BC TX buffer full - dropping the oldest frame\n"); 454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 455 } else 456 tx->local->total_ps_buffered++; 457 458 skb_queue_tail(&ps->bc_buf, tx->skb); 459 460 return TX_QUEUED; 461 } 462 463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 464 struct sk_buff *skb) 465 { 466 if (!ieee80211_is_mgmt(fc)) 467 return 0; 468 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 470 return 0; 471 472 if (!ieee80211_is_robust_mgmt_frame(skb)) 473 return 0; 474 475 return 1; 476 } 477 478 static ieee80211_tx_result 479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 480 { 481 struct sta_info *sta = tx->sta; 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 484 struct ieee80211_local *local = tx->local; 485 486 if (unlikely(!sta)) 487 return TX_CONTINUE; 488 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 493 int ac = skb_get_queue_mapping(tx->skb); 494 495 if (ieee80211_is_mgmt(hdr->frame_control) && 496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 498 return TX_CONTINUE; 499 } 500 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 502 sta->sta.addr, sta->sta.aid, ac); 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 504 purge_old_ps_buffers(tx->local); 505 506 /* sync with ieee80211_sta_ps_deliver_wakeup */ 507 spin_lock(&sta->ps_lock); 508 /* 509 * STA woke up the meantime and all the frames on ps_tx_buf have 510 * been queued to pending queue. No reordering can happen, go 511 * ahead and Tx the packet. 512 */ 513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 516 spin_unlock(&sta->ps_lock); 517 return TX_CONTINUE; 518 } 519 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 522 ps_dbg(tx->sdata, 523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 524 sta->sta.addr, ac); 525 ieee80211_free_txskb(&local->hw, old); 526 } else 527 tx->local->total_ps_buffered++; 528 529 info->control.jiffies = jiffies; 530 info->control.vif = &tx->sdata->vif; 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 534 spin_unlock(&sta->ps_lock); 535 536 if (!timer_pending(&local->sta_cleanup)) 537 mod_timer(&local->sta_cleanup, 538 round_jiffies(jiffies + 539 STA_INFO_CLEANUP_INTERVAL)); 540 541 /* 542 * We queued up some frames, so the TIM bit might 543 * need to be set, recalculate it. 544 */ 545 sta_info_recalc_tim(sta); 546 547 return TX_QUEUED; 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 549 ps_dbg(tx->sdata, 550 "STA %pM in PS mode, but polling/in SP -> send frame\n", 551 sta->sta.addr); 552 } 553 554 return TX_CONTINUE; 555 } 556 557 static ieee80211_tx_result debug_noinline 558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 559 { 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 561 return TX_CONTINUE; 562 563 if (tx->flags & IEEE80211_TX_UNICAST) 564 return ieee80211_tx_h_unicast_ps_buf(tx); 565 else 566 return ieee80211_tx_h_multicast_ps_buf(tx); 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 575 if (tx->sdata->control_port_no_encrypt) 576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 579 } 580 581 return TX_CONTINUE; 582 } 583 584 static ieee80211_tx_result debug_noinline 585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 586 { 587 struct ieee80211_key *key; 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 590 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 592 tx->key = NULL; 593 else if (tx->sta && 594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 595 tx->key = key; 596 else if (ieee80211_is_group_privacy_action(tx->skb) && 597 (key = rcu_dereference(tx->sdata->default_multicast_key))) 598 tx->key = key; 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 603 tx->key = key; 604 else if (is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_multicast_key))) 606 tx->key = key; 607 else if (!is_multicast_ether_addr(hdr->addr1) && 608 (key = rcu_dereference(tx->sdata->default_unicast_key))) 609 tx->key = key; 610 else 611 tx->key = NULL; 612 613 if (tx->key) { 614 bool skip_hw = false; 615 616 /* TODO: add threshold stuff again */ 617 618 switch (tx->key->conf.cipher) { 619 case WLAN_CIPHER_SUITE_WEP40: 620 case WLAN_CIPHER_SUITE_WEP104: 621 case WLAN_CIPHER_SUITE_TKIP: 622 if (!ieee80211_is_data_present(hdr->frame_control)) 623 tx->key = NULL; 624 break; 625 case WLAN_CIPHER_SUITE_CCMP: 626 case WLAN_CIPHER_SUITE_CCMP_256: 627 case WLAN_CIPHER_SUITE_GCMP: 628 case WLAN_CIPHER_SUITE_GCMP_256: 629 if (!ieee80211_is_data_present(hdr->frame_control) && 630 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 631 tx->skb) && 632 !ieee80211_is_group_privacy_action(tx->skb)) 633 tx->key = NULL; 634 else 635 skip_hw = (tx->key->conf.flags & 636 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 637 ieee80211_is_mgmt(hdr->frame_control); 638 break; 639 case WLAN_CIPHER_SUITE_AES_CMAC: 640 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 643 if (!ieee80211_is_mgmt(hdr->frame_control)) 644 tx->key = NULL; 645 break; 646 } 647 648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 649 !ieee80211_is_deauth(hdr->frame_control))) 650 return TX_DROP; 651 652 if (!skip_hw && tx->key && 653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 654 info->control.hw_key = &tx->key->conf; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 686 txrc.max_rate_idx = -1; 687 else 688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 689 690 if (tx->sdata->rc_has_mcs_mask[info->band]) 691 txrc.rate_idx_mcs_mask = 692 tx->sdata->rc_rateidx_mcs_mask[info->band]; 693 694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 697 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 698 699 /* set up RTS protection if desired */ 700 if (len > tx->local->hw.wiphy->rts_threshold) { 701 txrc.rts = true; 702 } 703 704 info->control.use_rts = txrc.rts; 705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 706 707 /* 708 * Use short preamble if the BSS can handle it, but not for 709 * management frames unless we know the receiver can handle 710 * that -- the management frame might be to a station that 711 * just wants a probe response. 712 */ 713 if (tx->sdata->vif.bss_conf.use_short_preamble && 714 (ieee80211_is_data(hdr->frame_control) || 715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 716 txrc.short_preamble = true; 717 718 info->control.short_preamble = txrc.short_preamble; 719 720 /* don't ask rate control when rate already injected via radiotap */ 721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 722 return TX_CONTINUE; 723 724 if (tx->sta) 725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 726 727 /* 728 * Lets not bother rate control if we're associated and cannot 729 * talk to the sta. This should not happen. 730 */ 731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 732 !rate_usable_index_exists(sband, &tx->sta->sta), 733 "%s: Dropped data frame as no usable bitrate found while " 734 "scanning and associated. Target station: " 735 "%pM on %d GHz band\n", 736 tx->sdata->name, hdr->addr1, 737 info->band ? 5 : 2)) 738 return TX_DROP; 739 740 /* 741 * If we're associated with the sta at this point we know we can at 742 * least send the frame at the lowest bit rate. 743 */ 744 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 745 746 if (tx->sta && !info->control.skip_table) 747 ratetbl = rcu_dereference(tx->sta->sta.rates); 748 749 if (unlikely(info->control.rates[0].idx < 0)) { 750 if (ratetbl) { 751 struct ieee80211_tx_rate rate = { 752 .idx = ratetbl->rate[0].idx, 753 .flags = ratetbl->rate[0].flags, 754 .count = ratetbl->rate[0].count 755 }; 756 757 if (ratetbl->rate[0].idx < 0) 758 return TX_DROP; 759 760 tx->rate = rate; 761 } else { 762 return TX_DROP; 763 } 764 } else { 765 tx->rate = info->control.rates[0]; 766 } 767 768 if (txrc.reported_rate.idx < 0) { 769 txrc.reported_rate = tx->rate; 770 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 } else if (tx->sta) 773 tx->sta->tx_stats.last_rate = txrc.reported_rate; 774 775 if (ratetbl) 776 return TX_CONTINUE; 777 778 if (unlikely(!info->control.rates[0].count)) 779 info->control.rates[0].count = 1; 780 781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 782 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 783 info->control.rates[0].count = 1; 784 785 return TX_CONTINUE; 786 } 787 788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 789 { 790 u16 *seq = &sta->tid_seq[tid]; 791 __le16 ret = cpu_to_le16(*seq); 792 793 /* Increase the sequence number. */ 794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 795 796 return ret; 797 } 798 799 static ieee80211_tx_result debug_noinline 800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 801 { 802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 804 u8 *qc; 805 int tid; 806 807 /* 808 * Packet injection may want to control the sequence 809 * number, if we have no matching interface then we 810 * neither assign one ourselves nor ask the driver to. 811 */ 812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 813 return TX_CONTINUE; 814 815 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 816 return TX_CONTINUE; 817 818 if (ieee80211_hdrlen(hdr->frame_control) < 24) 819 return TX_CONTINUE; 820 821 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 822 return TX_CONTINUE; 823 824 /* 825 * Anything but QoS data that has a sequence number field 826 * (is long enough) gets a sequence number from the global 827 * counter. QoS data frames with a multicast destination 828 * also use the global counter (802.11-2012 9.3.2.10). 829 */ 830 if (!ieee80211_is_data_qos(hdr->frame_control) || 831 is_multicast_ether_addr(hdr->addr1)) { 832 /* driver should assign sequence number */ 833 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 834 /* for pure STA mode without beacons, we can do it */ 835 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 836 tx->sdata->sequence_number += 0x10; 837 if (tx->sta) 838 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 839 return TX_CONTINUE; 840 } 841 842 /* 843 * This should be true for injected/management frames only, for 844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 845 * above since they are not QoS-data frames. 846 */ 847 if (!tx->sta) 848 return TX_CONTINUE; 849 850 /* include per-STA, per-TID sequence counter */ 851 852 qc = ieee80211_get_qos_ctl(hdr); 853 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 854 tx->sta->tx_stats.msdu[tid]++; 855 856 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 857 858 return TX_CONTINUE; 859 } 860 861 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 862 struct sk_buff *skb, int hdrlen, 863 int frag_threshold) 864 { 865 struct ieee80211_local *local = tx->local; 866 struct ieee80211_tx_info *info; 867 struct sk_buff *tmp; 868 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 869 int pos = hdrlen + per_fragm; 870 int rem = skb->len - hdrlen - per_fragm; 871 872 if (WARN_ON(rem < 0)) 873 return -EINVAL; 874 875 /* first fragment was already added to queue by caller */ 876 877 while (rem) { 878 int fraglen = per_fragm; 879 880 if (fraglen > rem) 881 fraglen = rem; 882 rem -= fraglen; 883 tmp = dev_alloc_skb(local->tx_headroom + 884 frag_threshold + 885 tx->sdata->encrypt_headroom + 886 IEEE80211_ENCRYPT_TAILROOM); 887 if (!tmp) 888 return -ENOMEM; 889 890 __skb_queue_tail(&tx->skbs, tmp); 891 892 skb_reserve(tmp, 893 local->tx_headroom + tx->sdata->encrypt_headroom); 894 895 /* copy control information */ 896 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 897 898 info = IEEE80211_SKB_CB(tmp); 899 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 900 IEEE80211_TX_CTL_FIRST_FRAGMENT); 901 902 if (rem) 903 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 904 905 skb_copy_queue_mapping(tmp, skb); 906 tmp->priority = skb->priority; 907 tmp->dev = skb->dev; 908 909 /* copy header and data */ 910 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 911 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 912 913 pos += fraglen; 914 } 915 916 /* adjust first fragment's length */ 917 skb_trim(skb, hdrlen + per_fragm); 918 return 0; 919 } 920 921 static ieee80211_tx_result debug_noinline 922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 923 { 924 struct sk_buff *skb = tx->skb; 925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 926 struct ieee80211_hdr *hdr = (void *)skb->data; 927 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 928 int hdrlen; 929 int fragnum; 930 931 /* no matter what happens, tx->skb moves to tx->skbs */ 932 __skb_queue_tail(&tx->skbs, skb); 933 tx->skb = NULL; 934 935 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 936 return TX_CONTINUE; 937 938 if (tx->local->ops->set_frag_threshold) 939 return TX_CONTINUE; 940 941 /* 942 * Warn when submitting a fragmented A-MPDU frame and drop it. 943 * This scenario is handled in ieee80211_tx_prepare but extra 944 * caution taken here as fragmented ampdu may cause Tx stop. 945 */ 946 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 947 return TX_DROP; 948 949 hdrlen = ieee80211_hdrlen(hdr->frame_control); 950 951 /* internal error, why isn't DONTFRAG set? */ 952 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 953 return TX_DROP; 954 955 /* 956 * Now fragment the frame. This will allocate all the fragments and 957 * chain them (using skb as the first fragment) to skb->next. 958 * During transmission, we will remove the successfully transmitted 959 * fragments from this list. When the low-level driver rejects one 960 * of the fragments then we will simply pretend to accept the skb 961 * but store it away as pending. 962 */ 963 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 964 return TX_DROP; 965 966 /* update duration/seq/flags of fragments */ 967 fragnum = 0; 968 969 skb_queue_walk(&tx->skbs, skb) { 970 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 971 972 hdr = (void *)skb->data; 973 info = IEEE80211_SKB_CB(skb); 974 975 if (!skb_queue_is_last(&tx->skbs, skb)) { 976 hdr->frame_control |= morefrags; 977 /* 978 * No multi-rate retries for fragmented frames, that 979 * would completely throw off the NAV at other STAs. 980 */ 981 info->control.rates[1].idx = -1; 982 info->control.rates[2].idx = -1; 983 info->control.rates[3].idx = -1; 984 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 985 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 986 } else { 987 hdr->frame_control &= ~morefrags; 988 } 989 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 990 fragnum++; 991 } 992 993 return TX_CONTINUE; 994 } 995 996 static ieee80211_tx_result debug_noinline 997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 998 { 999 struct sk_buff *skb; 1000 int ac = -1; 1001 1002 if (!tx->sta) 1003 return TX_CONTINUE; 1004 1005 skb_queue_walk(&tx->skbs, skb) { 1006 ac = skb_get_queue_mapping(skb); 1007 tx->sta->tx_stats.bytes[ac] += skb->len; 1008 } 1009 if (ac >= 0) 1010 tx->sta->tx_stats.packets[ac]++; 1011 1012 return TX_CONTINUE; 1013 } 1014 1015 static ieee80211_tx_result debug_noinline 1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1017 { 1018 if (!tx->key) 1019 return TX_CONTINUE; 1020 1021 switch (tx->key->conf.cipher) { 1022 case WLAN_CIPHER_SUITE_WEP40: 1023 case WLAN_CIPHER_SUITE_WEP104: 1024 return ieee80211_crypto_wep_encrypt(tx); 1025 case WLAN_CIPHER_SUITE_TKIP: 1026 return ieee80211_crypto_tkip_encrypt(tx); 1027 case WLAN_CIPHER_SUITE_CCMP: 1028 return ieee80211_crypto_ccmp_encrypt( 1029 tx, IEEE80211_CCMP_MIC_LEN); 1030 case WLAN_CIPHER_SUITE_CCMP_256: 1031 return ieee80211_crypto_ccmp_encrypt( 1032 tx, IEEE80211_CCMP_256_MIC_LEN); 1033 case WLAN_CIPHER_SUITE_AES_CMAC: 1034 return ieee80211_crypto_aes_cmac_encrypt(tx); 1035 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1036 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1038 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1039 return ieee80211_crypto_aes_gmac_encrypt(tx); 1040 case WLAN_CIPHER_SUITE_GCMP: 1041 case WLAN_CIPHER_SUITE_GCMP_256: 1042 return ieee80211_crypto_gcmp_encrypt(tx); 1043 default: 1044 return ieee80211_crypto_hw_encrypt(tx); 1045 } 1046 1047 return TX_DROP; 1048 } 1049 1050 static ieee80211_tx_result debug_noinline 1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1052 { 1053 struct sk_buff *skb; 1054 struct ieee80211_hdr *hdr; 1055 int next_len; 1056 bool group_addr; 1057 1058 skb_queue_walk(&tx->skbs, skb) { 1059 hdr = (void *) skb->data; 1060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1061 break; /* must not overwrite AID */ 1062 if (!skb_queue_is_last(&tx->skbs, skb)) { 1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1064 next_len = next->len; 1065 } else 1066 next_len = 0; 1067 group_addr = is_multicast_ether_addr(hdr->addr1); 1068 1069 hdr->duration_id = 1070 ieee80211_duration(tx, skb, group_addr, next_len); 1071 } 1072 1073 return TX_CONTINUE; 1074 } 1075 1076 /* actual transmit path */ 1077 1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1079 struct sk_buff *skb, 1080 struct ieee80211_tx_info *info, 1081 struct tid_ampdu_tx *tid_tx, 1082 int tid) 1083 { 1084 bool queued = false; 1085 bool reset_agg_timer = false; 1086 struct sk_buff *purge_skb = NULL; 1087 1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1089 info->flags |= IEEE80211_TX_CTL_AMPDU; 1090 reset_agg_timer = true; 1091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1092 /* 1093 * nothing -- this aggregation session is being started 1094 * but that might still fail with the driver 1095 */ 1096 } else if (!tx->sta->sta.txq[tid]) { 1097 spin_lock(&tx->sta->lock); 1098 /* 1099 * Need to re-check now, because we may get here 1100 * 1101 * 1) in the window during which the setup is actually 1102 * already done, but not marked yet because not all 1103 * packets are spliced over to the driver pending 1104 * queue yet -- if this happened we acquire the lock 1105 * either before or after the splice happens, but 1106 * need to recheck which of these cases happened. 1107 * 1108 * 2) during session teardown, if the OPERATIONAL bit 1109 * was cleared due to the teardown but the pointer 1110 * hasn't been assigned NULL yet (or we loaded it 1111 * before it was assigned) -- in this case it may 1112 * now be NULL which means we should just let the 1113 * packet pass through because splicing the frames 1114 * back is already done. 1115 */ 1116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1117 1118 if (!tid_tx) { 1119 /* do nothing, let packet pass through */ 1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1121 info->flags |= IEEE80211_TX_CTL_AMPDU; 1122 reset_agg_timer = true; 1123 } else { 1124 queued = true; 1125 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1126 clear_sta_flag(tx->sta, WLAN_STA_SP); 1127 ps_dbg(tx->sta->sdata, 1128 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1129 tx->sta->sta.addr, tx->sta->sta.aid); 1130 } 1131 info->control.vif = &tx->sdata->vif; 1132 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1133 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1134 __skb_queue_tail(&tid_tx->pending, skb); 1135 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1136 purge_skb = __skb_dequeue(&tid_tx->pending); 1137 } 1138 spin_unlock(&tx->sta->lock); 1139 1140 if (purge_skb) 1141 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1142 } 1143 1144 /* reset session timer */ 1145 if (reset_agg_timer && tid_tx->timeout) 1146 tid_tx->last_tx = jiffies; 1147 1148 return queued; 1149 } 1150 1151 /* 1152 * initialises @tx 1153 * pass %NULL for the station if unknown, a valid pointer if known 1154 * or an ERR_PTR() if the station is known not to exist 1155 */ 1156 static ieee80211_tx_result 1157 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1158 struct ieee80211_tx_data *tx, 1159 struct sta_info *sta, struct sk_buff *skb) 1160 { 1161 struct ieee80211_local *local = sdata->local; 1162 struct ieee80211_hdr *hdr; 1163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1164 int tid; 1165 u8 *qc; 1166 1167 memset(tx, 0, sizeof(*tx)); 1168 tx->skb = skb; 1169 tx->local = local; 1170 tx->sdata = sdata; 1171 __skb_queue_head_init(&tx->skbs); 1172 1173 /* 1174 * If this flag is set to true anywhere, and we get here, 1175 * we are doing the needed processing, so remove the flag 1176 * now. 1177 */ 1178 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1179 1180 hdr = (struct ieee80211_hdr *) skb->data; 1181 1182 if (likely(sta)) { 1183 if (!IS_ERR(sta)) 1184 tx->sta = sta; 1185 } else { 1186 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1187 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1188 if (!tx->sta && sdata->wdev.use_4addr) 1189 return TX_DROP; 1190 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1191 IEEE80211_TX_CTL_INJECTED) || 1192 tx->sdata->control_port_protocol == tx->skb->protocol) { 1193 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1194 } 1195 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1196 tx->sta = sta_info_get(sdata, hdr->addr1); 1197 } 1198 1199 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1200 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1201 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1202 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1203 struct tid_ampdu_tx *tid_tx; 1204 1205 qc = ieee80211_get_qos_ctl(hdr); 1206 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1207 1208 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1209 if (tid_tx) { 1210 bool queued; 1211 1212 queued = ieee80211_tx_prep_agg(tx, skb, info, 1213 tid_tx, tid); 1214 1215 if (unlikely(queued)) 1216 return TX_QUEUED; 1217 } 1218 } 1219 1220 if (is_multicast_ether_addr(hdr->addr1)) { 1221 tx->flags &= ~IEEE80211_TX_UNICAST; 1222 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1223 } else 1224 tx->flags |= IEEE80211_TX_UNICAST; 1225 1226 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1227 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1228 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1229 info->flags & IEEE80211_TX_CTL_AMPDU) 1230 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1231 } 1232 1233 if (!tx->sta) 1234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1235 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1236 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1237 ieee80211_check_fast_xmit(tx->sta); 1238 } 1239 1240 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1241 1242 return TX_CONTINUE; 1243 } 1244 1245 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1246 struct ieee80211_vif *vif, 1247 struct ieee80211_sta *pubsta, 1248 struct sk_buff *skb) 1249 { 1250 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1251 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1252 struct ieee80211_txq *txq = NULL; 1253 1254 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1255 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1256 return NULL; 1257 1258 if (!ieee80211_is_data(hdr->frame_control)) 1259 return NULL; 1260 1261 if (pubsta) { 1262 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1263 1264 txq = pubsta->txq[tid]; 1265 } else if (vif) { 1266 txq = vif->txq; 1267 } 1268 1269 if (!txq) 1270 return NULL; 1271 1272 return to_txq_info(txq); 1273 } 1274 1275 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1276 { 1277 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1278 } 1279 1280 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi) 1281 { 1282 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif; 1283 } 1284 1285 static u32 codel_skb_len_func(const struct sk_buff *skb) 1286 { 1287 return skb->len; 1288 } 1289 1290 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1291 { 1292 const struct ieee80211_tx_info *info; 1293 1294 info = (const struct ieee80211_tx_info *)skb->cb; 1295 return info->control.enqueue_time; 1296 } 1297 1298 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1299 void *ctx) 1300 { 1301 struct ieee80211_local *local; 1302 struct txq_info *txqi; 1303 struct fq *fq; 1304 struct fq_flow *flow; 1305 1306 txqi = ctx; 1307 local = vif_to_sdata(txqi->txq.vif)->local; 1308 fq = &local->fq; 1309 1310 if (cvars == &txqi->def_cvars) 1311 flow = &txqi->def_flow; 1312 else 1313 flow = &fq->flows[cvars - local->cvars]; 1314 1315 return fq_flow_dequeue(fq, flow); 1316 } 1317 1318 static void codel_drop_func(struct sk_buff *skb, 1319 void *ctx) 1320 { 1321 struct ieee80211_local *local; 1322 struct ieee80211_hw *hw; 1323 struct txq_info *txqi; 1324 1325 txqi = ctx; 1326 local = vif_to_sdata(txqi->txq.vif)->local; 1327 hw = &local->hw; 1328 1329 ieee80211_free_txskb(hw, skb); 1330 } 1331 1332 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1333 struct fq_tin *tin, 1334 struct fq_flow *flow) 1335 { 1336 struct ieee80211_local *local; 1337 struct txq_info *txqi; 1338 struct codel_vars *cvars; 1339 struct codel_params *cparams; 1340 struct codel_stats *cstats; 1341 1342 local = container_of(fq, struct ieee80211_local, fq); 1343 txqi = container_of(tin, struct txq_info, tin); 1344 cparams = &local->cparams; 1345 cstats = &txqi->cstats; 1346 1347 if (flow == &txqi->def_flow) 1348 cvars = &txqi->def_cvars; 1349 else 1350 cvars = &local->cvars[flow - fq->flows]; 1351 1352 return codel_dequeue(txqi, 1353 &flow->backlog, 1354 cparams, 1355 cvars, 1356 cstats, 1357 codel_skb_len_func, 1358 codel_skb_time_func, 1359 codel_drop_func, 1360 codel_dequeue_func); 1361 } 1362 1363 static void fq_skb_free_func(struct fq *fq, 1364 struct fq_tin *tin, 1365 struct fq_flow *flow, 1366 struct sk_buff *skb) 1367 { 1368 struct ieee80211_local *local; 1369 1370 local = container_of(fq, struct ieee80211_local, fq); 1371 ieee80211_free_txskb(&local->hw, skb); 1372 } 1373 1374 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1375 struct fq_tin *tin, 1376 int idx, 1377 struct sk_buff *skb) 1378 { 1379 struct txq_info *txqi; 1380 1381 txqi = container_of(tin, struct txq_info, tin); 1382 return &txqi->def_flow; 1383 } 1384 1385 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1386 struct txq_info *txqi, 1387 struct sk_buff *skb) 1388 { 1389 struct fq *fq = &local->fq; 1390 struct fq_tin *tin = &txqi->tin; 1391 1392 ieee80211_set_skb_enqueue_time(skb); 1393 fq_tin_enqueue(fq, tin, skb, 1394 fq_skb_free_func, 1395 fq_flow_get_default_func); 1396 } 1397 1398 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1399 struct sta_info *sta, 1400 struct txq_info *txqi, int tid) 1401 { 1402 fq_tin_init(&txqi->tin); 1403 fq_flow_init(&txqi->def_flow); 1404 codel_vars_init(&txqi->def_cvars); 1405 codel_stats_init(&txqi->cstats); 1406 __skb_queue_head_init(&txqi->frags); 1407 1408 txqi->txq.vif = &sdata->vif; 1409 1410 if (sta) { 1411 txqi->txq.sta = &sta->sta; 1412 sta->sta.txq[tid] = &txqi->txq; 1413 txqi->txq.tid = tid; 1414 txqi->txq.ac = ieee802_1d_to_ac[tid & 7]; 1415 } else { 1416 sdata->vif.txq = &txqi->txq; 1417 txqi->txq.tid = 0; 1418 txqi->txq.ac = IEEE80211_AC_BE; 1419 } 1420 } 1421 1422 void ieee80211_txq_purge(struct ieee80211_local *local, 1423 struct txq_info *txqi) 1424 { 1425 struct fq *fq = &local->fq; 1426 struct fq_tin *tin = &txqi->tin; 1427 1428 fq_tin_reset(fq, tin, fq_skb_free_func); 1429 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1430 } 1431 1432 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1433 { 1434 struct fq *fq = &local->fq; 1435 int ret; 1436 int i; 1437 bool supp_vht = false; 1438 enum nl80211_band band; 1439 1440 if (!local->ops->wake_tx_queue) 1441 return 0; 1442 1443 ret = fq_init(fq, 4096); 1444 if (ret) 1445 return ret; 1446 1447 /* 1448 * If the hardware doesn't support VHT, it is safe to limit the maximum 1449 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1450 */ 1451 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1452 struct ieee80211_supported_band *sband; 1453 1454 sband = local->hw.wiphy->bands[band]; 1455 if (!sband) 1456 continue; 1457 1458 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1459 } 1460 1461 if (!supp_vht) 1462 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1463 1464 codel_params_init(&local->cparams); 1465 local->cparams.interval = MS2TIME(100); 1466 local->cparams.target = MS2TIME(20); 1467 local->cparams.ecn = true; 1468 1469 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1470 GFP_KERNEL); 1471 if (!local->cvars) { 1472 spin_lock_bh(&fq->lock); 1473 fq_reset(fq, fq_skb_free_func); 1474 spin_unlock_bh(&fq->lock); 1475 return -ENOMEM; 1476 } 1477 1478 for (i = 0; i < fq->flows_cnt; i++) 1479 codel_vars_init(&local->cvars[i]); 1480 1481 return 0; 1482 } 1483 1484 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1485 { 1486 struct fq *fq = &local->fq; 1487 1488 if (!local->ops->wake_tx_queue) 1489 return; 1490 1491 kfree(local->cvars); 1492 local->cvars = NULL; 1493 1494 spin_lock_bh(&fq->lock); 1495 fq_reset(fq, fq_skb_free_func); 1496 spin_unlock_bh(&fq->lock); 1497 } 1498 1499 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1500 struct ieee80211_sub_if_data *sdata, 1501 struct sta_info *sta, 1502 struct sk_buff *skb) 1503 { 1504 struct fq *fq = &local->fq; 1505 struct ieee80211_vif *vif; 1506 struct txq_info *txqi; 1507 struct ieee80211_sta *pubsta; 1508 1509 if (!local->ops->wake_tx_queue || 1510 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1511 return false; 1512 1513 if (sta && sta->uploaded) 1514 pubsta = &sta->sta; 1515 else 1516 pubsta = NULL; 1517 1518 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1519 sdata = container_of(sdata->bss, 1520 struct ieee80211_sub_if_data, u.ap); 1521 1522 vif = &sdata->vif; 1523 txqi = ieee80211_get_txq(local, vif, pubsta, skb); 1524 1525 if (!txqi) 1526 return false; 1527 1528 spin_lock_bh(&fq->lock); 1529 ieee80211_txq_enqueue(local, txqi, skb); 1530 spin_unlock_bh(&fq->lock); 1531 1532 drv_wake_tx_queue(local, txqi); 1533 1534 return true; 1535 } 1536 1537 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1538 struct ieee80211_vif *vif, 1539 struct ieee80211_sta *sta, 1540 struct sk_buff_head *skbs, 1541 bool txpending) 1542 { 1543 struct ieee80211_tx_control control = {}; 1544 struct sk_buff *skb, *tmp; 1545 unsigned long flags; 1546 1547 skb_queue_walk_safe(skbs, skb, tmp) { 1548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1549 int q = info->hw_queue; 1550 1551 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1552 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1553 __skb_unlink(skb, skbs); 1554 ieee80211_free_txskb(&local->hw, skb); 1555 continue; 1556 } 1557 #endif 1558 1559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1560 if (local->queue_stop_reasons[q] || 1561 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1562 if (unlikely(info->flags & 1563 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1564 if (local->queue_stop_reasons[q] & 1565 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1566 /* 1567 * Drop off-channel frames if queues 1568 * are stopped for any reason other 1569 * than off-channel operation. Never 1570 * queue them. 1571 */ 1572 spin_unlock_irqrestore( 1573 &local->queue_stop_reason_lock, 1574 flags); 1575 ieee80211_purge_tx_queue(&local->hw, 1576 skbs); 1577 return true; 1578 } 1579 } else { 1580 1581 /* 1582 * Since queue is stopped, queue up frames for 1583 * later transmission from the tx-pending 1584 * tasklet when the queue is woken again. 1585 */ 1586 if (txpending) 1587 skb_queue_splice_init(skbs, 1588 &local->pending[q]); 1589 else 1590 skb_queue_splice_tail_init(skbs, 1591 &local->pending[q]); 1592 1593 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1594 flags); 1595 return false; 1596 } 1597 } 1598 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1599 1600 info->control.vif = vif; 1601 control.sta = sta; 1602 1603 __skb_unlink(skb, skbs); 1604 drv_tx(local, &control, skb); 1605 } 1606 1607 return true; 1608 } 1609 1610 /* 1611 * Returns false if the frame couldn't be transmitted but was queued instead. 1612 */ 1613 static bool __ieee80211_tx(struct ieee80211_local *local, 1614 struct sk_buff_head *skbs, int led_len, 1615 struct sta_info *sta, bool txpending) 1616 { 1617 struct ieee80211_tx_info *info; 1618 struct ieee80211_sub_if_data *sdata; 1619 struct ieee80211_vif *vif; 1620 struct ieee80211_sta *pubsta; 1621 struct sk_buff *skb; 1622 bool result = true; 1623 __le16 fc; 1624 1625 if (WARN_ON(skb_queue_empty(skbs))) 1626 return true; 1627 1628 skb = skb_peek(skbs); 1629 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1630 info = IEEE80211_SKB_CB(skb); 1631 sdata = vif_to_sdata(info->control.vif); 1632 if (sta && !sta->uploaded) 1633 sta = NULL; 1634 1635 if (sta) 1636 pubsta = &sta->sta; 1637 else 1638 pubsta = NULL; 1639 1640 switch (sdata->vif.type) { 1641 case NL80211_IFTYPE_MONITOR: 1642 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1643 vif = &sdata->vif; 1644 break; 1645 } 1646 sdata = rcu_dereference(local->monitor_sdata); 1647 if (sdata) { 1648 vif = &sdata->vif; 1649 info->hw_queue = 1650 vif->hw_queue[skb_get_queue_mapping(skb)]; 1651 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1652 ieee80211_purge_tx_queue(&local->hw, skbs); 1653 return true; 1654 } else 1655 vif = NULL; 1656 break; 1657 case NL80211_IFTYPE_AP_VLAN: 1658 sdata = container_of(sdata->bss, 1659 struct ieee80211_sub_if_data, u.ap); 1660 /* fall through */ 1661 default: 1662 vif = &sdata->vif; 1663 break; 1664 } 1665 1666 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1667 txpending); 1668 1669 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1670 1671 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1672 1673 return result; 1674 } 1675 1676 /* 1677 * Invoke TX handlers, return 0 on success and non-zero if the 1678 * frame was dropped or queued. 1679 * 1680 * The handlers are split into an early and late part. The latter is everything 1681 * that can be sensitive to reordering, and will be deferred to after packets 1682 * are dequeued from the intermediate queues (when they are enabled). 1683 */ 1684 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1685 { 1686 ieee80211_tx_result res = TX_DROP; 1687 1688 #define CALL_TXH(txh) \ 1689 do { \ 1690 res = txh(tx); \ 1691 if (res != TX_CONTINUE) \ 1692 goto txh_done; \ 1693 } while (0) 1694 1695 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1696 CALL_TXH(ieee80211_tx_h_check_assoc); 1697 CALL_TXH(ieee80211_tx_h_ps_buf); 1698 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1699 CALL_TXH(ieee80211_tx_h_select_key); 1700 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1701 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1702 1703 txh_done: 1704 if (unlikely(res == TX_DROP)) { 1705 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1706 if (tx->skb) 1707 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1708 else 1709 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1710 return -1; 1711 } else if (unlikely(res == TX_QUEUED)) { 1712 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1713 return -1; 1714 } 1715 1716 return 0; 1717 } 1718 1719 /* 1720 * Late handlers can be called while the sta lock is held. Handlers that can 1721 * cause packets to be generated will cause deadlock! 1722 */ 1723 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1724 { 1725 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1726 ieee80211_tx_result res = TX_CONTINUE; 1727 1728 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1729 __skb_queue_tail(&tx->skbs, tx->skb); 1730 tx->skb = NULL; 1731 goto txh_done; 1732 } 1733 1734 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1735 CALL_TXH(ieee80211_tx_h_sequence); 1736 CALL_TXH(ieee80211_tx_h_fragment); 1737 /* handlers after fragment must be aware of tx info fragmentation! */ 1738 CALL_TXH(ieee80211_tx_h_stats); 1739 CALL_TXH(ieee80211_tx_h_encrypt); 1740 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1741 CALL_TXH(ieee80211_tx_h_calculate_duration); 1742 #undef CALL_TXH 1743 1744 txh_done: 1745 if (unlikely(res == TX_DROP)) { 1746 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1747 if (tx->skb) 1748 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1749 else 1750 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1751 return -1; 1752 } else if (unlikely(res == TX_QUEUED)) { 1753 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1754 return -1; 1755 } 1756 1757 return 0; 1758 } 1759 1760 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1761 { 1762 int r = invoke_tx_handlers_early(tx); 1763 1764 if (r) 1765 return r; 1766 return invoke_tx_handlers_late(tx); 1767 } 1768 1769 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1770 struct ieee80211_vif *vif, struct sk_buff *skb, 1771 int band, struct ieee80211_sta **sta) 1772 { 1773 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1774 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1775 struct ieee80211_tx_data tx; 1776 struct sk_buff *skb2; 1777 1778 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1779 return false; 1780 1781 info->band = band; 1782 info->control.vif = vif; 1783 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1784 1785 if (invoke_tx_handlers(&tx)) 1786 return false; 1787 1788 if (sta) { 1789 if (tx.sta) 1790 *sta = &tx.sta->sta; 1791 else 1792 *sta = NULL; 1793 } 1794 1795 /* this function isn't suitable for fragmented data frames */ 1796 skb2 = __skb_dequeue(&tx.skbs); 1797 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1798 ieee80211_free_txskb(hw, skb2); 1799 ieee80211_purge_tx_queue(hw, &tx.skbs); 1800 return false; 1801 } 1802 1803 return true; 1804 } 1805 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1806 1807 /* 1808 * Returns false if the frame couldn't be transmitted but was queued instead. 1809 */ 1810 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1811 struct sta_info *sta, struct sk_buff *skb, 1812 bool txpending) 1813 { 1814 struct ieee80211_local *local = sdata->local; 1815 struct ieee80211_tx_data tx; 1816 ieee80211_tx_result res_prepare; 1817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1818 bool result = true; 1819 int led_len; 1820 1821 if (unlikely(skb->len < 10)) { 1822 dev_kfree_skb(skb); 1823 return true; 1824 } 1825 1826 /* initialises tx */ 1827 led_len = skb->len; 1828 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1829 1830 if (unlikely(res_prepare == TX_DROP)) { 1831 ieee80211_free_txskb(&local->hw, skb); 1832 return true; 1833 } else if (unlikely(res_prepare == TX_QUEUED)) { 1834 return true; 1835 } 1836 1837 /* set up hw_queue value early */ 1838 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1839 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1840 info->hw_queue = 1841 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1842 1843 if (invoke_tx_handlers_early(&tx)) 1844 return false; 1845 1846 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1847 return true; 1848 1849 if (!invoke_tx_handlers_late(&tx)) 1850 result = __ieee80211_tx(local, &tx.skbs, led_len, 1851 tx.sta, txpending); 1852 1853 return result; 1854 } 1855 1856 /* device xmit handlers */ 1857 1858 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1859 struct sk_buff *skb, 1860 int head_need, bool may_encrypt) 1861 { 1862 struct ieee80211_local *local = sdata->local; 1863 int tail_need = 0; 1864 1865 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1866 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1867 tail_need -= skb_tailroom(skb); 1868 tail_need = max_t(int, tail_need, 0); 1869 } 1870 1871 if (skb_cloned(skb) && 1872 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1873 !skb_clone_writable(skb, ETH_HLEN) || 1874 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1875 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1876 else if (head_need || tail_need) 1877 I802_DEBUG_INC(local->tx_expand_skb_head); 1878 else 1879 return 0; 1880 1881 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1882 wiphy_debug(local->hw.wiphy, 1883 "failed to reallocate TX buffer\n"); 1884 return -ENOMEM; 1885 } 1886 1887 return 0; 1888 } 1889 1890 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1891 struct sta_info *sta, struct sk_buff *skb) 1892 { 1893 struct ieee80211_local *local = sdata->local; 1894 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1896 int headroom; 1897 bool may_encrypt; 1898 1899 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1900 1901 headroom = local->tx_headroom; 1902 if (may_encrypt) 1903 headroom += sdata->encrypt_headroom; 1904 headroom -= skb_headroom(skb); 1905 headroom = max_t(int, 0, headroom); 1906 1907 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1908 ieee80211_free_txskb(&local->hw, skb); 1909 return; 1910 } 1911 1912 hdr = (struct ieee80211_hdr *) skb->data; 1913 info->control.vif = &sdata->vif; 1914 1915 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1916 if (ieee80211_is_data(hdr->frame_control) && 1917 is_unicast_ether_addr(hdr->addr1)) { 1918 if (mesh_nexthop_resolve(sdata, skb)) 1919 return; /* skb queued: don't free */ 1920 } else { 1921 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1922 } 1923 } 1924 1925 ieee80211_set_qos_hdr(sdata, skb); 1926 ieee80211_tx(sdata, sta, skb, false); 1927 } 1928 1929 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1930 struct sk_buff *skb) 1931 { 1932 struct ieee80211_radiotap_iterator iterator; 1933 struct ieee80211_radiotap_header *rthdr = 1934 (struct ieee80211_radiotap_header *) skb->data; 1935 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1936 struct ieee80211_supported_band *sband = 1937 local->hw.wiphy->bands[info->band]; 1938 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1939 NULL); 1940 u16 txflags; 1941 u16 rate = 0; 1942 bool rate_found = false; 1943 u8 rate_retries = 0; 1944 u16 rate_flags = 0; 1945 u8 mcs_known, mcs_flags, mcs_bw; 1946 u16 vht_known; 1947 u8 vht_mcs = 0, vht_nss = 0; 1948 int i; 1949 1950 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1951 IEEE80211_TX_CTL_DONTFRAG; 1952 1953 /* 1954 * for every radiotap entry that is present 1955 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1956 * entries present, or -EINVAL on error) 1957 */ 1958 1959 while (!ret) { 1960 ret = ieee80211_radiotap_iterator_next(&iterator); 1961 1962 if (ret) 1963 continue; 1964 1965 /* see if this argument is something we can use */ 1966 switch (iterator.this_arg_index) { 1967 /* 1968 * You must take care when dereferencing iterator.this_arg 1969 * for multibyte types... the pointer is not aligned. Use 1970 * get_unaligned((type *)iterator.this_arg) to dereference 1971 * iterator.this_arg for type "type" safely on all arches. 1972 */ 1973 case IEEE80211_RADIOTAP_FLAGS: 1974 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1975 /* 1976 * this indicates that the skb we have been 1977 * handed has the 32-bit FCS CRC at the end... 1978 * we should react to that by snipping it off 1979 * because it will be recomputed and added 1980 * on transmission 1981 */ 1982 if (skb->len < (iterator._max_length + FCS_LEN)) 1983 return false; 1984 1985 skb_trim(skb, skb->len - FCS_LEN); 1986 } 1987 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1988 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1990 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1991 break; 1992 1993 case IEEE80211_RADIOTAP_TX_FLAGS: 1994 txflags = get_unaligned_le16(iterator.this_arg); 1995 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1996 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1997 break; 1998 1999 case IEEE80211_RADIOTAP_RATE: 2000 rate = *iterator.this_arg; 2001 rate_flags = 0; 2002 rate_found = true; 2003 break; 2004 2005 case IEEE80211_RADIOTAP_DATA_RETRIES: 2006 rate_retries = *iterator.this_arg; 2007 break; 2008 2009 case IEEE80211_RADIOTAP_MCS: 2010 mcs_known = iterator.this_arg[0]; 2011 mcs_flags = iterator.this_arg[1]; 2012 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2013 break; 2014 2015 rate_found = true; 2016 rate = iterator.this_arg[2]; 2017 rate_flags = IEEE80211_TX_RC_MCS; 2018 2019 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2020 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2021 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2022 2023 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2024 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2025 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2026 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2027 break; 2028 2029 case IEEE80211_RADIOTAP_VHT: 2030 vht_known = get_unaligned_le16(iterator.this_arg); 2031 rate_found = true; 2032 2033 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2034 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2035 (iterator.this_arg[2] & 2036 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2037 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2038 if (vht_known & 2039 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2040 if (iterator.this_arg[3] == 1) 2041 rate_flags |= 2042 IEEE80211_TX_RC_40_MHZ_WIDTH; 2043 else if (iterator.this_arg[3] == 4) 2044 rate_flags |= 2045 IEEE80211_TX_RC_80_MHZ_WIDTH; 2046 else if (iterator.this_arg[3] == 11) 2047 rate_flags |= 2048 IEEE80211_TX_RC_160_MHZ_WIDTH; 2049 } 2050 2051 vht_mcs = iterator.this_arg[4] >> 4; 2052 vht_nss = iterator.this_arg[4] & 0xF; 2053 break; 2054 2055 /* 2056 * Please update the file 2057 * Documentation/networking/mac80211-injection.txt 2058 * when parsing new fields here. 2059 */ 2060 2061 default: 2062 break; 2063 } 2064 } 2065 2066 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2067 return false; 2068 2069 if (rate_found) { 2070 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2071 2072 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2073 info->control.rates[i].idx = -1; 2074 info->control.rates[i].flags = 0; 2075 info->control.rates[i].count = 0; 2076 } 2077 2078 if (rate_flags & IEEE80211_TX_RC_MCS) { 2079 info->control.rates[0].idx = rate; 2080 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2081 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2082 vht_nss); 2083 } else { 2084 for (i = 0; i < sband->n_bitrates; i++) { 2085 if (rate * 5 != sband->bitrates[i].bitrate) 2086 continue; 2087 2088 info->control.rates[0].idx = i; 2089 break; 2090 } 2091 } 2092 2093 if (info->control.rates[0].idx < 0) 2094 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2095 2096 info->control.rates[0].flags = rate_flags; 2097 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2098 local->hw.max_rate_tries); 2099 } 2100 2101 /* 2102 * remove the radiotap header 2103 * iterator->_max_length was sanity-checked against 2104 * skb->len by iterator init 2105 */ 2106 skb_pull(skb, iterator._max_length); 2107 2108 return true; 2109 } 2110 2111 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2112 struct net_device *dev) 2113 { 2114 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2115 struct ieee80211_chanctx_conf *chanctx_conf; 2116 struct ieee80211_radiotap_header *prthdr = 2117 (struct ieee80211_radiotap_header *)skb->data; 2118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2119 struct ieee80211_hdr *hdr; 2120 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2121 struct cfg80211_chan_def *chandef; 2122 u16 len_rthdr; 2123 int hdrlen; 2124 2125 /* check for not even having the fixed radiotap header part */ 2126 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2127 goto fail; /* too short to be possibly valid */ 2128 2129 /* is it a header version we can trust to find length from? */ 2130 if (unlikely(prthdr->it_version)) 2131 goto fail; /* only version 0 is supported */ 2132 2133 /* then there must be a radiotap header with a length we can use */ 2134 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2135 2136 /* does the skb contain enough to deliver on the alleged length? */ 2137 if (unlikely(skb->len < len_rthdr)) 2138 goto fail; /* skb too short for claimed rt header extent */ 2139 2140 /* 2141 * fix up the pointers accounting for the radiotap 2142 * header still being in there. We are being given 2143 * a precooked IEEE80211 header so no need for 2144 * normal processing 2145 */ 2146 skb_set_mac_header(skb, len_rthdr); 2147 /* 2148 * these are just fixed to the end of the rt area since we 2149 * don't have any better information and at this point, nobody cares 2150 */ 2151 skb_set_network_header(skb, len_rthdr); 2152 skb_set_transport_header(skb, len_rthdr); 2153 2154 if (skb->len < len_rthdr + 2) 2155 goto fail; 2156 2157 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2158 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2159 2160 if (skb->len < len_rthdr + hdrlen) 2161 goto fail; 2162 2163 /* 2164 * Initialize skb->protocol if the injected frame is a data frame 2165 * carrying a rfc1042 header 2166 */ 2167 if (ieee80211_is_data(hdr->frame_control) && 2168 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2169 u8 *payload = (u8 *)hdr + hdrlen; 2170 2171 if (ether_addr_equal(payload, rfc1042_header)) 2172 skb->protocol = cpu_to_be16((payload[6] << 8) | 2173 payload[7]); 2174 } 2175 2176 memset(info, 0, sizeof(*info)); 2177 2178 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2179 IEEE80211_TX_CTL_INJECTED; 2180 2181 rcu_read_lock(); 2182 2183 /* 2184 * We process outgoing injected frames that have a local address 2185 * we handle as though they are non-injected frames. 2186 * This code here isn't entirely correct, the local MAC address 2187 * isn't always enough to find the interface to use; for proper 2188 * VLAN/WDS support we will need a different mechanism (which 2189 * likely isn't going to be monitor interfaces). 2190 */ 2191 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2192 2193 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2194 if (!ieee80211_sdata_running(tmp_sdata)) 2195 continue; 2196 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2197 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2198 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2199 continue; 2200 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2201 sdata = tmp_sdata; 2202 break; 2203 } 2204 } 2205 2206 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2207 if (!chanctx_conf) { 2208 tmp_sdata = rcu_dereference(local->monitor_sdata); 2209 if (tmp_sdata) 2210 chanctx_conf = 2211 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2212 } 2213 2214 if (chanctx_conf) 2215 chandef = &chanctx_conf->def; 2216 else if (!local->use_chanctx) 2217 chandef = &local->_oper_chandef; 2218 else 2219 goto fail_rcu; 2220 2221 /* 2222 * Frame injection is not allowed if beaconing is not allowed 2223 * or if we need radar detection. Beaconing is usually not allowed when 2224 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2225 * Passive scan is also used in world regulatory domains where 2226 * your country is not known and as such it should be treated as 2227 * NO TX unless the channel is explicitly allowed in which case 2228 * your current regulatory domain would not have the passive scan 2229 * flag. 2230 * 2231 * Since AP mode uses monitor interfaces to inject/TX management 2232 * frames we can make AP mode the exception to this rule once it 2233 * supports radar detection as its implementation can deal with 2234 * radar detection by itself. We can do that later by adding a 2235 * monitor flag interfaces used for AP support. 2236 */ 2237 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2238 sdata->vif.type)) 2239 goto fail_rcu; 2240 2241 info->band = chandef->chan->band; 2242 2243 /* process and remove the injection radiotap header */ 2244 if (!ieee80211_parse_tx_radiotap(local, skb)) 2245 goto fail_rcu; 2246 2247 ieee80211_xmit(sdata, NULL, skb); 2248 rcu_read_unlock(); 2249 2250 return NETDEV_TX_OK; 2251 2252 fail_rcu: 2253 rcu_read_unlock(); 2254 fail: 2255 dev_kfree_skb(skb); 2256 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2257 } 2258 2259 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2260 { 2261 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2262 2263 return ethertype == ETH_P_TDLS && 2264 skb->len > 14 && 2265 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2266 } 2267 2268 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2269 struct sk_buff *skb, 2270 struct sta_info **sta_out) 2271 { 2272 struct sta_info *sta; 2273 2274 switch (sdata->vif.type) { 2275 case NL80211_IFTYPE_AP_VLAN: 2276 sta = rcu_dereference(sdata->u.vlan.sta); 2277 if (sta) { 2278 *sta_out = sta; 2279 return 0; 2280 } else if (sdata->wdev.use_4addr) { 2281 return -ENOLINK; 2282 } 2283 /* fall through */ 2284 case NL80211_IFTYPE_AP: 2285 case NL80211_IFTYPE_OCB: 2286 case NL80211_IFTYPE_ADHOC: 2287 if (is_multicast_ether_addr(skb->data)) { 2288 *sta_out = ERR_PTR(-ENOENT); 2289 return 0; 2290 } 2291 sta = sta_info_get_bss(sdata, skb->data); 2292 break; 2293 case NL80211_IFTYPE_WDS: 2294 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2295 break; 2296 #ifdef CONFIG_MAC80211_MESH 2297 case NL80211_IFTYPE_MESH_POINT: 2298 /* determined much later */ 2299 *sta_out = NULL; 2300 return 0; 2301 #endif 2302 case NL80211_IFTYPE_STATION: 2303 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2304 sta = sta_info_get(sdata, skb->data); 2305 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2306 if (test_sta_flag(sta, 2307 WLAN_STA_TDLS_PEER_AUTH)) { 2308 *sta_out = sta; 2309 return 0; 2310 } 2311 2312 /* 2313 * TDLS link during setup - throw out frames to 2314 * peer. Allow TDLS-setup frames to unauthorized 2315 * peers for the special case of a link teardown 2316 * after a TDLS sta is removed due to being 2317 * unreachable. 2318 */ 2319 if (!ieee80211_is_tdls_setup(skb)) 2320 return -EINVAL; 2321 } 2322 2323 } 2324 2325 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2326 if (!sta) 2327 return -ENOLINK; 2328 break; 2329 default: 2330 return -EINVAL; 2331 } 2332 2333 *sta_out = sta ?: ERR_PTR(-ENOENT); 2334 return 0; 2335 } 2336 2337 /** 2338 * ieee80211_build_hdr - build 802.11 header in the given frame 2339 * @sdata: virtual interface to build the header for 2340 * @skb: the skb to build the header in 2341 * @info_flags: skb flags to set 2342 * 2343 * This function takes the skb with 802.3 header and reformats the header to 2344 * the appropriate IEEE 802.11 header based on which interface the packet is 2345 * being transmitted on. 2346 * 2347 * Note that this function also takes care of the TX status request and 2348 * potential unsharing of the SKB - this needs to be interleaved with the 2349 * header building. 2350 * 2351 * The function requires the read-side RCU lock held 2352 * 2353 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2354 */ 2355 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2356 struct sk_buff *skb, u32 info_flags, 2357 struct sta_info *sta) 2358 { 2359 struct ieee80211_local *local = sdata->local; 2360 struct ieee80211_tx_info *info; 2361 int head_need; 2362 u16 ethertype, hdrlen, meshhdrlen = 0; 2363 __le16 fc; 2364 struct ieee80211_hdr hdr; 2365 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2366 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2367 const u8 *encaps_data; 2368 int encaps_len, skip_header_bytes; 2369 bool wme_sta = false, authorized = false; 2370 bool tdls_peer; 2371 bool multicast; 2372 u16 info_id = 0; 2373 struct ieee80211_chanctx_conf *chanctx_conf; 2374 struct ieee80211_sub_if_data *ap_sdata; 2375 enum nl80211_band band; 2376 int ret; 2377 2378 if (IS_ERR(sta)) 2379 sta = NULL; 2380 2381 /* convert Ethernet header to proper 802.11 header (based on 2382 * operation mode) */ 2383 ethertype = (skb->data[12] << 8) | skb->data[13]; 2384 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2385 2386 switch (sdata->vif.type) { 2387 case NL80211_IFTYPE_AP_VLAN: 2388 if (sdata->wdev.use_4addr) { 2389 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2390 /* RA TA DA SA */ 2391 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2392 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2393 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2394 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2395 hdrlen = 30; 2396 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2397 wme_sta = sta->sta.wme; 2398 } 2399 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2400 u.ap); 2401 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2402 if (!chanctx_conf) { 2403 ret = -ENOTCONN; 2404 goto free; 2405 } 2406 band = chanctx_conf->def.chan->band; 2407 if (sdata->wdev.use_4addr) 2408 break; 2409 /* fall through */ 2410 case NL80211_IFTYPE_AP: 2411 if (sdata->vif.type == NL80211_IFTYPE_AP) 2412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2413 if (!chanctx_conf) { 2414 ret = -ENOTCONN; 2415 goto free; 2416 } 2417 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2418 /* DA BSSID SA */ 2419 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2420 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2422 hdrlen = 24; 2423 band = chanctx_conf->def.chan->band; 2424 break; 2425 case NL80211_IFTYPE_WDS: 2426 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2427 /* RA TA DA SA */ 2428 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2429 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2430 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2431 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2432 hdrlen = 30; 2433 /* 2434 * This is the exception! WDS style interfaces are prohibited 2435 * when channel contexts are in used so this must be valid 2436 */ 2437 band = local->hw.conf.chandef.chan->band; 2438 break; 2439 #ifdef CONFIG_MAC80211_MESH 2440 case NL80211_IFTYPE_MESH_POINT: 2441 if (!is_multicast_ether_addr(skb->data)) { 2442 struct sta_info *next_hop; 2443 bool mpp_lookup = true; 2444 2445 mpath = mesh_path_lookup(sdata, skb->data); 2446 if (mpath) { 2447 mpp_lookup = false; 2448 next_hop = rcu_dereference(mpath->next_hop); 2449 if (!next_hop || 2450 !(mpath->flags & (MESH_PATH_ACTIVE | 2451 MESH_PATH_RESOLVING))) 2452 mpp_lookup = true; 2453 } 2454 2455 if (mpp_lookup) { 2456 mppath = mpp_path_lookup(sdata, skb->data); 2457 if (mppath) 2458 mppath->exp_time = jiffies; 2459 } 2460 2461 if (mppath && mpath) 2462 mesh_path_del(sdata, mpath->dst); 2463 } 2464 2465 /* 2466 * Use address extension if it is a packet from 2467 * another interface or if we know the destination 2468 * is being proxied by a portal (i.e. portal address 2469 * differs from proxied address) 2470 */ 2471 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2472 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2473 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2474 skb->data, skb->data + ETH_ALEN); 2475 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2476 NULL, NULL); 2477 } else { 2478 /* DS -> MBSS (802.11-2012 13.11.3.3). 2479 * For unicast with unknown forwarding information, 2480 * destination might be in the MBSS or if that fails 2481 * forwarded to another mesh gate. In either case 2482 * resolution will be handled in ieee80211_xmit(), so 2483 * leave the original DA. This also works for mcast */ 2484 const u8 *mesh_da = skb->data; 2485 2486 if (mppath) 2487 mesh_da = mppath->mpp; 2488 else if (mpath) 2489 mesh_da = mpath->dst; 2490 2491 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2492 mesh_da, sdata->vif.addr); 2493 if (is_multicast_ether_addr(mesh_da)) 2494 /* DA TA mSA AE:SA */ 2495 meshhdrlen = ieee80211_new_mesh_header( 2496 sdata, &mesh_hdr, 2497 skb->data + ETH_ALEN, NULL); 2498 else 2499 /* RA TA mDA mSA AE:DA SA */ 2500 meshhdrlen = ieee80211_new_mesh_header( 2501 sdata, &mesh_hdr, skb->data, 2502 skb->data + ETH_ALEN); 2503 2504 } 2505 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2506 if (!chanctx_conf) { 2507 ret = -ENOTCONN; 2508 goto free; 2509 } 2510 band = chanctx_conf->def.chan->band; 2511 break; 2512 #endif 2513 case NL80211_IFTYPE_STATION: 2514 /* we already did checks when looking up the RA STA */ 2515 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2516 2517 if (tdls_peer) { 2518 /* DA SA BSSID */ 2519 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2520 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2521 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2522 hdrlen = 24; 2523 } else if (sdata->u.mgd.use_4addr && 2524 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2525 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2526 IEEE80211_FCTL_TODS); 2527 /* RA TA DA SA */ 2528 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2529 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2530 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2531 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2532 hdrlen = 30; 2533 } else { 2534 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2535 /* BSSID SA DA */ 2536 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2537 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2538 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2539 hdrlen = 24; 2540 } 2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2542 if (!chanctx_conf) { 2543 ret = -ENOTCONN; 2544 goto free; 2545 } 2546 band = chanctx_conf->def.chan->band; 2547 break; 2548 case NL80211_IFTYPE_OCB: 2549 /* DA SA BSSID */ 2550 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2551 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2552 eth_broadcast_addr(hdr.addr3); 2553 hdrlen = 24; 2554 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2555 if (!chanctx_conf) { 2556 ret = -ENOTCONN; 2557 goto free; 2558 } 2559 band = chanctx_conf->def.chan->band; 2560 break; 2561 case NL80211_IFTYPE_ADHOC: 2562 /* DA SA BSSID */ 2563 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2565 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2566 hdrlen = 24; 2567 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2568 if (!chanctx_conf) { 2569 ret = -ENOTCONN; 2570 goto free; 2571 } 2572 band = chanctx_conf->def.chan->band; 2573 break; 2574 default: 2575 ret = -EINVAL; 2576 goto free; 2577 } 2578 2579 multicast = is_multicast_ether_addr(hdr.addr1); 2580 2581 /* sta is always NULL for mesh */ 2582 if (sta) { 2583 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2584 wme_sta = sta->sta.wme; 2585 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2586 /* For mesh, the use of the QoS header is mandatory */ 2587 wme_sta = true; 2588 } 2589 2590 /* receiver does QoS (which also means we do) use it */ 2591 if (wme_sta) { 2592 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2593 hdrlen += 2; 2594 } 2595 2596 /* 2597 * Drop unicast frames to unauthorised stations unless they are 2598 * EAPOL frames from the local station. 2599 */ 2600 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2601 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2602 !multicast && !authorized && 2603 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2604 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2605 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2606 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2607 sdata->name, hdr.addr1); 2608 #endif 2609 2610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2611 2612 ret = -EPERM; 2613 goto free; 2614 } 2615 2616 if (unlikely(!multicast && skb->sk && 2617 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2618 struct sk_buff *ack_skb = skb_clone_sk(skb); 2619 2620 if (ack_skb) { 2621 unsigned long flags; 2622 int id; 2623 2624 spin_lock_irqsave(&local->ack_status_lock, flags); 2625 id = idr_alloc(&local->ack_status_frames, ack_skb, 2626 1, 0x10000, GFP_ATOMIC); 2627 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2628 2629 if (id >= 0) { 2630 info_id = id; 2631 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2632 } else { 2633 kfree_skb(ack_skb); 2634 } 2635 } 2636 } 2637 2638 /* 2639 * If the skb is shared we need to obtain our own copy. 2640 */ 2641 if (skb_shared(skb)) { 2642 struct sk_buff *tmp_skb = skb; 2643 2644 /* can't happen -- skb is a clone if info_id != 0 */ 2645 WARN_ON(info_id); 2646 2647 skb = skb_clone(skb, GFP_ATOMIC); 2648 kfree_skb(tmp_skb); 2649 2650 if (!skb) { 2651 ret = -ENOMEM; 2652 goto free; 2653 } 2654 } 2655 2656 hdr.frame_control = fc; 2657 hdr.duration_id = 0; 2658 hdr.seq_ctrl = 0; 2659 2660 skip_header_bytes = ETH_HLEN; 2661 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2662 encaps_data = bridge_tunnel_header; 2663 encaps_len = sizeof(bridge_tunnel_header); 2664 skip_header_bytes -= 2; 2665 } else if (ethertype >= ETH_P_802_3_MIN) { 2666 encaps_data = rfc1042_header; 2667 encaps_len = sizeof(rfc1042_header); 2668 skip_header_bytes -= 2; 2669 } else { 2670 encaps_data = NULL; 2671 encaps_len = 0; 2672 } 2673 2674 skb_pull(skb, skip_header_bytes); 2675 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2676 2677 /* 2678 * So we need to modify the skb header and hence need a copy of 2679 * that. The head_need variable above doesn't, so far, include 2680 * the needed header space that we don't need right away. If we 2681 * can, then we don't reallocate right now but only after the 2682 * frame arrives at the master device (if it does...) 2683 * 2684 * If we cannot, however, then we will reallocate to include all 2685 * the ever needed space. Also, if we need to reallocate it anyway, 2686 * make it big enough for everything we may ever need. 2687 */ 2688 2689 if (head_need > 0 || skb_cloned(skb)) { 2690 head_need += sdata->encrypt_headroom; 2691 head_need += local->tx_headroom; 2692 head_need = max_t(int, 0, head_need); 2693 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2694 ieee80211_free_txskb(&local->hw, skb); 2695 skb = NULL; 2696 return ERR_PTR(-ENOMEM); 2697 } 2698 } 2699 2700 if (encaps_data) 2701 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2702 2703 #ifdef CONFIG_MAC80211_MESH 2704 if (meshhdrlen > 0) 2705 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2706 #endif 2707 2708 if (ieee80211_is_data_qos(fc)) { 2709 __le16 *qos_control; 2710 2711 qos_control = (__le16 *) skb_push(skb, 2); 2712 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2713 /* 2714 * Maybe we could actually set some fields here, for now just 2715 * initialise to zero to indicate no special operation. 2716 */ 2717 *qos_control = 0; 2718 } else 2719 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2720 2721 skb_reset_mac_header(skb); 2722 2723 info = IEEE80211_SKB_CB(skb); 2724 memset(info, 0, sizeof(*info)); 2725 2726 info->flags = info_flags; 2727 info->ack_frame_id = info_id; 2728 info->band = band; 2729 2730 return skb; 2731 free: 2732 kfree_skb(skb); 2733 return ERR_PTR(ret); 2734 } 2735 2736 /* 2737 * fast-xmit overview 2738 * 2739 * The core idea of this fast-xmit is to remove per-packet checks by checking 2740 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2741 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2742 * much less work can be done per packet. For example, fragmentation must be 2743 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2744 * in the code here. 2745 * 2746 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2747 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2748 * 2749 * The most difficult part of this is that when any of these assumptions 2750 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2751 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2752 * since the per-packet code no longer checks the conditions. This is reflected 2753 * by the calls to these functions throughout the rest of the code, and must be 2754 * maintained if any of the TX path checks change. 2755 */ 2756 2757 void ieee80211_check_fast_xmit(struct sta_info *sta) 2758 { 2759 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2760 struct ieee80211_local *local = sta->local; 2761 struct ieee80211_sub_if_data *sdata = sta->sdata; 2762 struct ieee80211_hdr *hdr = (void *)build.hdr; 2763 struct ieee80211_chanctx_conf *chanctx_conf; 2764 __le16 fc; 2765 2766 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2767 return; 2768 2769 /* Locking here protects both the pointer itself, and against concurrent 2770 * invocations winning data access races to, e.g., the key pointer that 2771 * is used. 2772 * Without it, the invocation of this function right after the key 2773 * pointer changes wouldn't be sufficient, as another CPU could access 2774 * the pointer, then stall, and then do the cache update after the CPU 2775 * that invalidated the key. 2776 * With the locking, such scenarios cannot happen as the check for the 2777 * key and the fast-tx assignment are done atomically, so the CPU that 2778 * modifies the key will either wait or other one will see the key 2779 * cleared/changed already. 2780 */ 2781 spin_lock_bh(&sta->lock); 2782 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2783 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2784 sdata->vif.type == NL80211_IFTYPE_STATION) 2785 goto out; 2786 2787 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2788 goto out; 2789 2790 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2791 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2792 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2793 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2794 goto out; 2795 2796 if (sdata->noack_map) 2797 goto out; 2798 2799 /* fast-xmit doesn't handle fragmentation at all */ 2800 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2801 !local->ops->set_frag_threshold) 2802 goto out; 2803 2804 rcu_read_lock(); 2805 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2806 if (!chanctx_conf) { 2807 rcu_read_unlock(); 2808 goto out; 2809 } 2810 build.band = chanctx_conf->def.chan->band; 2811 rcu_read_unlock(); 2812 2813 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2814 2815 switch (sdata->vif.type) { 2816 case NL80211_IFTYPE_ADHOC: 2817 /* DA SA BSSID */ 2818 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2819 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2820 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2821 build.hdr_len = 24; 2822 break; 2823 case NL80211_IFTYPE_STATION: 2824 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2825 /* DA SA BSSID */ 2826 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2827 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2828 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2829 build.hdr_len = 24; 2830 break; 2831 } 2832 2833 if (sdata->u.mgd.use_4addr) { 2834 /* non-regular ethertype cannot use the fastpath */ 2835 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2836 IEEE80211_FCTL_TODS); 2837 /* RA TA DA SA */ 2838 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2839 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2840 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2841 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2842 build.hdr_len = 30; 2843 break; 2844 } 2845 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2846 /* BSSID SA DA */ 2847 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2848 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2849 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2850 build.hdr_len = 24; 2851 break; 2852 case NL80211_IFTYPE_AP_VLAN: 2853 if (sdata->wdev.use_4addr) { 2854 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2855 IEEE80211_FCTL_TODS); 2856 /* RA TA DA SA */ 2857 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2858 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2859 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2860 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2861 build.hdr_len = 30; 2862 break; 2863 } 2864 /* fall through */ 2865 case NL80211_IFTYPE_AP: 2866 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2867 /* DA BSSID SA */ 2868 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2869 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2870 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2871 build.hdr_len = 24; 2872 break; 2873 default: 2874 /* not handled on fast-xmit */ 2875 goto out; 2876 } 2877 2878 if (sta->sta.wme) { 2879 build.hdr_len += 2; 2880 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2881 } 2882 2883 /* We store the key here so there's no point in using rcu_dereference() 2884 * but that's fine because the code that changes the pointers will call 2885 * this function after doing so. For a single CPU that would be enough, 2886 * for multiple see the comment above. 2887 */ 2888 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2889 if (!build.key) 2890 build.key = rcu_access_pointer(sdata->default_unicast_key); 2891 if (build.key) { 2892 bool gen_iv, iv_spc, mmic; 2893 2894 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2895 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2896 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2897 2898 /* don't handle software crypto */ 2899 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2900 goto out; 2901 2902 switch (build.key->conf.cipher) { 2903 case WLAN_CIPHER_SUITE_CCMP: 2904 case WLAN_CIPHER_SUITE_CCMP_256: 2905 /* add fixed key ID */ 2906 if (gen_iv) { 2907 (build.hdr + build.hdr_len)[3] = 2908 0x20 | (build.key->conf.keyidx << 6); 2909 build.pn_offs = build.hdr_len; 2910 } 2911 if (gen_iv || iv_spc) 2912 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2913 break; 2914 case WLAN_CIPHER_SUITE_GCMP: 2915 case WLAN_CIPHER_SUITE_GCMP_256: 2916 /* add fixed key ID */ 2917 if (gen_iv) { 2918 (build.hdr + build.hdr_len)[3] = 2919 0x20 | (build.key->conf.keyidx << 6); 2920 build.pn_offs = build.hdr_len; 2921 } 2922 if (gen_iv || iv_spc) 2923 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2924 break; 2925 case WLAN_CIPHER_SUITE_TKIP: 2926 /* cannot handle MMIC or IV generation in xmit-fast */ 2927 if (mmic || gen_iv) 2928 goto out; 2929 if (iv_spc) 2930 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2931 break; 2932 case WLAN_CIPHER_SUITE_WEP40: 2933 case WLAN_CIPHER_SUITE_WEP104: 2934 /* cannot handle IV generation in fast-xmit */ 2935 if (gen_iv) 2936 goto out; 2937 if (iv_spc) 2938 build.hdr_len += IEEE80211_WEP_IV_LEN; 2939 break; 2940 case WLAN_CIPHER_SUITE_AES_CMAC: 2941 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2942 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2943 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2944 WARN(1, 2945 "management cipher suite 0x%x enabled for data\n", 2946 build.key->conf.cipher); 2947 goto out; 2948 default: 2949 /* we don't know how to generate IVs for this at all */ 2950 if (WARN_ON(gen_iv)) 2951 goto out; 2952 /* pure hardware keys are OK, of course */ 2953 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2954 break; 2955 /* cipher scheme might require space allocation */ 2956 if (iv_spc && 2957 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2958 goto out; 2959 if (iv_spc) 2960 build.hdr_len += build.key->conf.iv_len; 2961 } 2962 2963 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2964 } 2965 2966 hdr->frame_control = fc; 2967 2968 memcpy(build.hdr + build.hdr_len, 2969 rfc1042_header, sizeof(rfc1042_header)); 2970 build.hdr_len += sizeof(rfc1042_header); 2971 2972 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2973 /* if the kmemdup fails, continue w/o fast_tx */ 2974 if (!fast_tx) 2975 goto out; 2976 2977 out: 2978 /* we might have raced against another call to this function */ 2979 old = rcu_dereference_protected(sta->fast_tx, 2980 lockdep_is_held(&sta->lock)); 2981 rcu_assign_pointer(sta->fast_tx, fast_tx); 2982 if (old) 2983 kfree_rcu(old, rcu_head); 2984 spin_unlock_bh(&sta->lock); 2985 } 2986 2987 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2988 { 2989 struct sta_info *sta; 2990 2991 rcu_read_lock(); 2992 list_for_each_entry_rcu(sta, &local->sta_list, list) 2993 ieee80211_check_fast_xmit(sta); 2994 rcu_read_unlock(); 2995 } 2996 2997 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2998 { 2999 struct ieee80211_local *local = sdata->local; 3000 struct sta_info *sta; 3001 3002 rcu_read_lock(); 3003 3004 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3005 if (sdata != sta->sdata && 3006 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3007 continue; 3008 ieee80211_check_fast_xmit(sta); 3009 } 3010 3011 rcu_read_unlock(); 3012 } 3013 3014 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3015 { 3016 struct ieee80211_fast_tx *fast_tx; 3017 3018 spin_lock_bh(&sta->lock); 3019 fast_tx = rcu_dereference_protected(sta->fast_tx, 3020 lockdep_is_held(&sta->lock)); 3021 RCU_INIT_POINTER(sta->fast_tx, NULL); 3022 spin_unlock_bh(&sta->lock); 3023 3024 if (fast_tx) 3025 kfree_rcu(fast_tx, rcu_head); 3026 } 3027 3028 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3029 struct sk_buff *skb, int headroom, 3030 int *subframe_len) 3031 { 3032 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3033 int padding = (4 - amsdu_len) & 3; 3034 3035 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3036 I802_DEBUG_INC(local->tx_expand_skb_head); 3037 3038 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3039 wiphy_debug(local->hw.wiphy, 3040 "failed to reallocate TX buffer\n"); 3041 return false; 3042 } 3043 } 3044 3045 if (padding) { 3046 *subframe_len += padding; 3047 memset(skb_put(skb, padding), 0, padding); 3048 } 3049 3050 return true; 3051 } 3052 3053 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3054 struct ieee80211_fast_tx *fast_tx, 3055 struct sk_buff *skb) 3056 { 3057 struct ieee80211_local *local = sdata->local; 3058 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3059 struct ieee80211_hdr *hdr; 3060 struct ethhdr amsdu_hdr; 3061 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3062 int subframe_len = skb->len - hdr_len; 3063 void *data; 3064 u8 *qc; 3065 3066 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3067 return false; 3068 3069 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3070 return true; 3071 3072 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr), 3073 &subframe_len)) 3074 return false; 3075 3076 amsdu_hdr.h_proto = cpu_to_be16(subframe_len); 3077 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN); 3078 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN); 3079 3080 data = skb_push(skb, sizeof(amsdu_hdr)); 3081 memmove(data, data + sizeof(amsdu_hdr), hdr_len); 3082 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr)); 3083 3084 hdr = data; 3085 qc = ieee80211_get_qos_ctl(hdr); 3086 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3087 3088 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3089 3090 return true; 3091 } 3092 3093 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3094 struct sta_info *sta, 3095 struct ieee80211_fast_tx *fast_tx, 3096 struct sk_buff *skb) 3097 { 3098 struct ieee80211_local *local = sdata->local; 3099 struct fq *fq = &local->fq; 3100 struct fq_tin *tin; 3101 struct fq_flow *flow; 3102 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3103 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3104 struct txq_info *txqi; 3105 struct sk_buff **frag_tail, *head; 3106 int subframe_len = skb->len - ETH_ALEN; 3107 u8 max_subframes = sta->sta.max_amsdu_subframes; 3108 int max_frags = local->hw.max_tx_fragments; 3109 int max_amsdu_len = sta->sta.max_amsdu_len; 3110 __be16 len; 3111 void *data; 3112 bool ret = false; 3113 unsigned int orig_len; 3114 int n = 1, nfrags; 3115 3116 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3117 return false; 3118 3119 if (!txq) 3120 return false; 3121 3122 txqi = to_txq_info(txq); 3123 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3124 return false; 3125 3126 if (sta->sta.max_rc_amsdu_len) 3127 max_amsdu_len = min_t(int, max_amsdu_len, 3128 sta->sta.max_rc_amsdu_len); 3129 3130 spin_lock_bh(&fq->lock); 3131 3132 /* TODO: Ideally aggregation should be done on dequeue to remain 3133 * responsive to environment changes. 3134 */ 3135 3136 tin = &txqi->tin; 3137 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3138 head = skb_peek_tail(&flow->queue); 3139 if (!head) 3140 goto out; 3141 3142 orig_len = head->len; 3143 3144 if (skb->len + head->len > max_amsdu_len) 3145 goto out; 3146 3147 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3148 goto out; 3149 3150 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3151 nfrags += 1 + skb_shinfo(head)->nr_frags; 3152 frag_tail = &skb_shinfo(head)->frag_list; 3153 while (*frag_tail) { 3154 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3155 frag_tail = &(*frag_tail)->next; 3156 n++; 3157 } 3158 3159 if (max_subframes && n > max_subframes) 3160 goto out; 3161 3162 if (max_frags && nfrags > max_frags) 3163 goto out; 3164 3165 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3166 &subframe_len)) 3167 goto out; 3168 3169 ret = true; 3170 data = skb_push(skb, ETH_ALEN + 2); 3171 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3172 3173 data += 2 * ETH_ALEN; 3174 len = cpu_to_be16(subframe_len); 3175 memcpy(data, &len, 2); 3176 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3177 3178 head->len += skb->len; 3179 head->data_len += skb->len; 3180 *frag_tail = skb; 3181 3182 flow->backlog += head->len - orig_len; 3183 tin->backlog_bytes += head->len - orig_len; 3184 3185 fq_recalc_backlog(fq, tin, flow); 3186 3187 out: 3188 spin_unlock_bh(&fq->lock); 3189 3190 return ret; 3191 } 3192 3193 /* 3194 * Can be called while the sta lock is held. Anything that can cause packets to 3195 * be generated will cause deadlock! 3196 */ 3197 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3198 struct sta_info *sta, u8 pn_offs, 3199 struct ieee80211_key *key, 3200 struct sk_buff *skb) 3201 { 3202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3203 struct ieee80211_hdr *hdr = (void *)skb->data; 3204 u8 tid = IEEE80211_NUM_TIDS; 3205 3206 if (key) 3207 info->control.hw_key = &key->conf; 3208 3209 ieee80211_tx_stats(skb->dev, skb->len); 3210 3211 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3212 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3213 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3214 } else { 3215 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3216 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3217 sdata->sequence_number += 0x10; 3218 } 3219 3220 if (skb_shinfo(skb)->gso_size) 3221 sta->tx_stats.msdu[tid] += 3222 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3223 else 3224 sta->tx_stats.msdu[tid]++; 3225 3226 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3227 3228 /* statistics normally done by ieee80211_tx_h_stats (but that 3229 * has to consider fragmentation, so is more complex) 3230 */ 3231 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3232 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3233 3234 if (pn_offs) { 3235 u64 pn; 3236 u8 *crypto_hdr = skb->data + pn_offs; 3237 3238 switch (key->conf.cipher) { 3239 case WLAN_CIPHER_SUITE_CCMP: 3240 case WLAN_CIPHER_SUITE_CCMP_256: 3241 case WLAN_CIPHER_SUITE_GCMP: 3242 case WLAN_CIPHER_SUITE_GCMP_256: 3243 pn = atomic64_inc_return(&key->conf.tx_pn); 3244 crypto_hdr[0] = pn; 3245 crypto_hdr[1] = pn >> 8; 3246 crypto_hdr[4] = pn >> 16; 3247 crypto_hdr[5] = pn >> 24; 3248 crypto_hdr[6] = pn >> 32; 3249 crypto_hdr[7] = pn >> 40; 3250 break; 3251 } 3252 } 3253 } 3254 3255 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3256 struct sta_info *sta, 3257 struct ieee80211_fast_tx *fast_tx, 3258 struct sk_buff *skb) 3259 { 3260 struct ieee80211_local *local = sdata->local; 3261 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3262 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3263 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3264 struct ethhdr eth; 3265 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3266 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3267 struct ieee80211_tx_data tx; 3268 ieee80211_tx_result r; 3269 struct tid_ampdu_tx *tid_tx = NULL; 3270 u8 tid = IEEE80211_NUM_TIDS; 3271 3272 /* control port protocol needs a lot of special handling */ 3273 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3274 return false; 3275 3276 /* only RFC 1042 SNAP */ 3277 if (ethertype < ETH_P_802_3_MIN) 3278 return false; 3279 3280 /* don't handle TX status request here either */ 3281 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3282 return false; 3283 3284 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3285 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3286 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3287 if (tid_tx) { 3288 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3289 return false; 3290 if (tid_tx->timeout) 3291 tid_tx->last_tx = jiffies; 3292 } 3293 } 3294 3295 /* after this point (skb is modified) we cannot return false */ 3296 3297 if (skb_shared(skb)) { 3298 struct sk_buff *tmp_skb = skb; 3299 3300 skb = skb_clone(skb, GFP_ATOMIC); 3301 kfree_skb(tmp_skb); 3302 3303 if (!skb) 3304 return true; 3305 } 3306 3307 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3308 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3309 return true; 3310 3311 /* will not be crypto-handled beyond what we do here, so use false 3312 * as the may-encrypt argument for the resize to not account for 3313 * more room than we already have in 'extra_head' 3314 */ 3315 if (unlikely(ieee80211_skb_resize(sdata, skb, 3316 max_t(int, extra_head + hw_headroom - 3317 skb_headroom(skb), 0), 3318 false))) { 3319 kfree_skb(skb); 3320 return true; 3321 } 3322 3323 memcpy(ð, skb->data, ETH_HLEN - 2); 3324 hdr = (void *)skb_push(skb, extra_head); 3325 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3326 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3327 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3328 3329 memset(info, 0, sizeof(*info)); 3330 info->band = fast_tx->band; 3331 info->control.vif = &sdata->vif; 3332 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3333 IEEE80211_TX_CTL_DONTFRAG | 3334 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3335 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3336 3337 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3338 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3339 *ieee80211_get_qos_ctl(hdr) = tid; 3340 } 3341 3342 __skb_queue_head_init(&tx.skbs); 3343 3344 tx.flags = IEEE80211_TX_UNICAST; 3345 tx.local = local; 3346 tx.sdata = sdata; 3347 tx.sta = sta; 3348 tx.key = fast_tx->key; 3349 3350 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3351 tx.skb = skb; 3352 r = ieee80211_tx_h_rate_ctrl(&tx); 3353 skb = tx.skb; 3354 tx.skb = NULL; 3355 3356 if (r != TX_CONTINUE) { 3357 if (r != TX_QUEUED) 3358 kfree_skb(skb); 3359 return true; 3360 } 3361 } 3362 3363 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3364 return true; 3365 3366 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3367 fast_tx->key, skb); 3368 3369 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3370 sdata = container_of(sdata->bss, 3371 struct ieee80211_sub_if_data, u.ap); 3372 3373 __skb_queue_tail(&tx.skbs, skb); 3374 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3375 return true; 3376 } 3377 3378 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3379 struct ieee80211_txq *txq) 3380 { 3381 struct ieee80211_local *local = hw_to_local(hw); 3382 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3383 struct ieee80211_hdr *hdr; 3384 struct sk_buff *skb = NULL; 3385 struct fq *fq = &local->fq; 3386 struct fq_tin *tin = &txqi->tin; 3387 struct ieee80211_tx_info *info; 3388 struct ieee80211_tx_data tx; 3389 ieee80211_tx_result r; 3390 3391 spin_lock_bh(&fq->lock); 3392 3393 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3394 goto out; 3395 3396 /* Make sure fragments stay together. */ 3397 skb = __skb_dequeue(&txqi->frags); 3398 if (skb) 3399 goto out; 3400 3401 begin: 3402 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3403 if (!skb) 3404 goto out; 3405 3406 ieee80211_set_skb_vif(skb, txqi); 3407 3408 hdr = (struct ieee80211_hdr *)skb->data; 3409 info = IEEE80211_SKB_CB(skb); 3410 3411 memset(&tx, 0, sizeof(tx)); 3412 __skb_queue_head_init(&tx.skbs); 3413 tx.local = local; 3414 tx.skb = skb; 3415 tx.sdata = vif_to_sdata(info->control.vif); 3416 3417 if (txq->sta) 3418 tx.sta = container_of(txq->sta, struct sta_info, sta); 3419 3420 /* 3421 * The key can be removed while the packet was queued, so need to call 3422 * this here to get the current key. 3423 */ 3424 r = ieee80211_tx_h_select_key(&tx); 3425 if (r != TX_CONTINUE) { 3426 ieee80211_free_txskb(&local->hw, skb); 3427 goto begin; 3428 } 3429 3430 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3431 info->flags |= IEEE80211_TX_CTL_AMPDU; 3432 else 3433 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3434 3435 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3436 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3437 sta); 3438 u8 pn_offs = 0; 3439 3440 if (tx.key && 3441 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3442 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3443 3444 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3445 tx.key, skb); 3446 } else { 3447 if (invoke_tx_handlers_late(&tx)) 3448 goto begin; 3449 3450 skb = __skb_dequeue(&tx.skbs); 3451 3452 if (!skb_queue_empty(&tx.skbs)) 3453 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3454 } 3455 3456 if (skb && skb_has_frag_list(skb) && 3457 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3458 if (skb_linearize(skb)) { 3459 ieee80211_free_txskb(&local->hw, skb); 3460 goto begin; 3461 } 3462 } 3463 3464 out: 3465 spin_unlock_bh(&fq->lock); 3466 3467 return skb; 3468 } 3469 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3470 3471 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3472 struct net_device *dev, 3473 u32 info_flags) 3474 { 3475 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3476 struct sta_info *sta; 3477 struct sk_buff *next; 3478 3479 if (unlikely(skb->len < ETH_HLEN)) { 3480 kfree_skb(skb); 3481 return; 3482 } 3483 3484 rcu_read_lock(); 3485 3486 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3487 goto out_free; 3488 3489 if (!IS_ERR_OR_NULL(sta)) { 3490 struct ieee80211_fast_tx *fast_tx; 3491 3492 fast_tx = rcu_dereference(sta->fast_tx); 3493 3494 if (fast_tx && 3495 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3496 goto out; 3497 } 3498 3499 if (skb_is_gso(skb)) { 3500 struct sk_buff *segs; 3501 3502 segs = skb_gso_segment(skb, 0); 3503 if (IS_ERR(segs)) { 3504 goto out_free; 3505 } else if (segs) { 3506 consume_skb(skb); 3507 skb = segs; 3508 } 3509 } else { 3510 /* we cannot process non-linear frames on this path */ 3511 if (skb_linearize(skb)) { 3512 kfree_skb(skb); 3513 goto out; 3514 } 3515 3516 /* the frame could be fragmented, software-encrypted, and other 3517 * things so we cannot really handle checksum offload with it - 3518 * fix it up in software before we handle anything else. 3519 */ 3520 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3521 skb_set_transport_header(skb, 3522 skb_checksum_start_offset(skb)); 3523 if (skb_checksum_help(skb)) 3524 goto out_free; 3525 } 3526 } 3527 3528 next = skb; 3529 while (next) { 3530 skb = next; 3531 next = skb->next; 3532 3533 skb->prev = NULL; 3534 skb->next = NULL; 3535 3536 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3537 if (IS_ERR(skb)) 3538 goto out; 3539 3540 ieee80211_tx_stats(dev, skb->len); 3541 3542 ieee80211_xmit(sdata, sta, skb); 3543 } 3544 goto out; 3545 out_free: 3546 kfree_skb(skb); 3547 out: 3548 rcu_read_unlock(); 3549 } 3550 3551 /** 3552 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3553 * @skb: packet to be sent 3554 * @dev: incoming interface 3555 * 3556 * On failure skb will be freed. 3557 */ 3558 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3559 struct net_device *dev) 3560 { 3561 __ieee80211_subif_start_xmit(skb, dev, 0); 3562 return NETDEV_TX_OK; 3563 } 3564 3565 struct sk_buff * 3566 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3567 struct sk_buff *skb, u32 info_flags) 3568 { 3569 struct ieee80211_hdr *hdr; 3570 struct ieee80211_tx_data tx = { 3571 .local = sdata->local, 3572 .sdata = sdata, 3573 }; 3574 struct sta_info *sta; 3575 3576 rcu_read_lock(); 3577 3578 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3579 kfree_skb(skb); 3580 skb = ERR_PTR(-EINVAL); 3581 goto out; 3582 } 3583 3584 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3585 if (IS_ERR(skb)) 3586 goto out; 3587 3588 hdr = (void *)skb->data; 3589 tx.sta = sta_info_get(sdata, hdr->addr1); 3590 tx.skb = skb; 3591 3592 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3593 rcu_read_unlock(); 3594 kfree_skb(skb); 3595 return ERR_PTR(-EINVAL); 3596 } 3597 3598 out: 3599 rcu_read_unlock(); 3600 return skb; 3601 } 3602 3603 /* 3604 * ieee80211_clear_tx_pending may not be called in a context where 3605 * it is possible that it packets could come in again. 3606 */ 3607 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3608 { 3609 struct sk_buff *skb; 3610 int i; 3611 3612 for (i = 0; i < local->hw.queues; i++) { 3613 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3614 ieee80211_free_txskb(&local->hw, skb); 3615 } 3616 } 3617 3618 /* 3619 * Returns false if the frame couldn't be transmitted but was queued instead, 3620 * which in this case means re-queued -- take as an indication to stop sending 3621 * more pending frames. 3622 */ 3623 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3624 struct sk_buff *skb) 3625 { 3626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3627 struct ieee80211_sub_if_data *sdata; 3628 struct sta_info *sta; 3629 struct ieee80211_hdr *hdr; 3630 bool result; 3631 struct ieee80211_chanctx_conf *chanctx_conf; 3632 3633 sdata = vif_to_sdata(info->control.vif); 3634 3635 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3637 if (unlikely(!chanctx_conf)) { 3638 dev_kfree_skb(skb); 3639 return true; 3640 } 3641 info->band = chanctx_conf->def.chan->band; 3642 result = ieee80211_tx(sdata, NULL, skb, true); 3643 } else { 3644 struct sk_buff_head skbs; 3645 3646 __skb_queue_head_init(&skbs); 3647 __skb_queue_tail(&skbs, skb); 3648 3649 hdr = (struct ieee80211_hdr *)skb->data; 3650 sta = sta_info_get(sdata, hdr->addr1); 3651 3652 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3653 } 3654 3655 return result; 3656 } 3657 3658 /* 3659 * Transmit all pending packets. Called from tasklet. 3660 */ 3661 void ieee80211_tx_pending(unsigned long data) 3662 { 3663 struct ieee80211_local *local = (struct ieee80211_local *)data; 3664 unsigned long flags; 3665 int i; 3666 bool txok; 3667 3668 rcu_read_lock(); 3669 3670 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3671 for (i = 0; i < local->hw.queues; i++) { 3672 /* 3673 * If queue is stopped by something other than due to pending 3674 * frames, or we have no pending frames, proceed to next queue. 3675 */ 3676 if (local->queue_stop_reasons[i] || 3677 skb_queue_empty(&local->pending[i])) 3678 continue; 3679 3680 while (!skb_queue_empty(&local->pending[i])) { 3681 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3682 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3683 3684 if (WARN_ON(!info->control.vif)) { 3685 ieee80211_free_txskb(&local->hw, skb); 3686 continue; 3687 } 3688 3689 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3690 flags); 3691 3692 txok = ieee80211_tx_pending_skb(local, skb); 3693 spin_lock_irqsave(&local->queue_stop_reason_lock, 3694 flags); 3695 if (!txok) 3696 break; 3697 } 3698 3699 if (skb_queue_empty(&local->pending[i])) 3700 ieee80211_propagate_queue_wake(local, i); 3701 } 3702 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3703 3704 rcu_read_unlock(); 3705 } 3706 3707 /* functions for drivers to get certain frames */ 3708 3709 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3710 struct ps_data *ps, struct sk_buff *skb, 3711 bool is_template) 3712 { 3713 u8 *pos, *tim; 3714 int aid0 = 0; 3715 int i, have_bits = 0, n1, n2; 3716 3717 /* Generate bitmap for TIM only if there are any STAs in power save 3718 * mode. */ 3719 if (atomic_read(&ps->num_sta_ps) > 0) 3720 /* in the hope that this is faster than 3721 * checking byte-for-byte */ 3722 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3723 IEEE80211_MAX_AID+1); 3724 if (!is_template) { 3725 if (ps->dtim_count == 0) 3726 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3727 else 3728 ps->dtim_count--; 3729 } 3730 3731 tim = pos = (u8 *) skb_put(skb, 6); 3732 *pos++ = WLAN_EID_TIM; 3733 *pos++ = 4; 3734 *pos++ = ps->dtim_count; 3735 *pos++ = sdata->vif.bss_conf.dtim_period; 3736 3737 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3738 aid0 = 1; 3739 3740 ps->dtim_bc_mc = aid0 == 1; 3741 3742 if (have_bits) { 3743 /* Find largest even number N1 so that bits numbered 1 through 3744 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3745 * (N2 + 1) x 8 through 2007 are 0. */ 3746 n1 = 0; 3747 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3748 if (ps->tim[i]) { 3749 n1 = i & 0xfe; 3750 break; 3751 } 3752 } 3753 n2 = n1; 3754 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3755 if (ps->tim[i]) { 3756 n2 = i; 3757 break; 3758 } 3759 } 3760 3761 /* Bitmap control */ 3762 *pos++ = n1 | aid0; 3763 /* Part Virt Bitmap */ 3764 skb_put(skb, n2 - n1); 3765 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3766 3767 tim[1] = n2 - n1 + 4; 3768 } else { 3769 *pos++ = aid0; /* Bitmap control */ 3770 *pos++ = 0; /* Part Virt Bitmap */ 3771 } 3772 } 3773 3774 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3775 struct ps_data *ps, struct sk_buff *skb, 3776 bool is_template) 3777 { 3778 struct ieee80211_local *local = sdata->local; 3779 3780 /* 3781 * Not very nice, but we want to allow the driver to call 3782 * ieee80211_beacon_get() as a response to the set_tim() 3783 * callback. That, however, is already invoked under the 3784 * sta_lock to guarantee consistent and race-free update 3785 * of the tim bitmap in mac80211 and the driver. 3786 */ 3787 if (local->tim_in_locked_section) { 3788 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3789 } else { 3790 spin_lock_bh(&local->tim_lock); 3791 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3792 spin_unlock_bh(&local->tim_lock); 3793 } 3794 3795 return 0; 3796 } 3797 3798 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3799 struct beacon_data *beacon) 3800 { 3801 struct probe_resp *resp; 3802 u8 *beacon_data; 3803 size_t beacon_data_len; 3804 int i; 3805 u8 count = beacon->csa_current_counter; 3806 3807 switch (sdata->vif.type) { 3808 case NL80211_IFTYPE_AP: 3809 beacon_data = beacon->tail; 3810 beacon_data_len = beacon->tail_len; 3811 break; 3812 case NL80211_IFTYPE_ADHOC: 3813 beacon_data = beacon->head; 3814 beacon_data_len = beacon->head_len; 3815 break; 3816 case NL80211_IFTYPE_MESH_POINT: 3817 beacon_data = beacon->head; 3818 beacon_data_len = beacon->head_len; 3819 break; 3820 default: 3821 return; 3822 } 3823 3824 rcu_read_lock(); 3825 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3826 resp = rcu_dereference(sdata->u.ap.probe_resp); 3827 3828 if (beacon->csa_counter_offsets[i]) { 3829 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3830 beacon_data_len)) { 3831 rcu_read_unlock(); 3832 return; 3833 } 3834 3835 beacon_data[beacon->csa_counter_offsets[i]] = count; 3836 } 3837 3838 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3839 resp->data[resp->csa_counter_offsets[i]] = count; 3840 } 3841 rcu_read_unlock(); 3842 } 3843 3844 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3845 { 3846 beacon->csa_current_counter--; 3847 3848 /* the counter should never reach 0 */ 3849 WARN_ON_ONCE(!beacon->csa_current_counter); 3850 3851 return beacon->csa_current_counter; 3852 } 3853 3854 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3855 { 3856 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3857 struct beacon_data *beacon = NULL; 3858 u8 count = 0; 3859 3860 rcu_read_lock(); 3861 3862 if (sdata->vif.type == NL80211_IFTYPE_AP) 3863 beacon = rcu_dereference(sdata->u.ap.beacon); 3864 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3865 beacon = rcu_dereference(sdata->u.ibss.presp); 3866 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3867 beacon = rcu_dereference(sdata->u.mesh.beacon); 3868 3869 if (!beacon) 3870 goto unlock; 3871 3872 count = __ieee80211_csa_update_counter(beacon); 3873 3874 unlock: 3875 rcu_read_unlock(); 3876 return count; 3877 } 3878 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3879 3880 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3881 { 3882 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3883 struct beacon_data *beacon = NULL; 3884 u8 *beacon_data; 3885 size_t beacon_data_len; 3886 int ret = false; 3887 3888 if (!ieee80211_sdata_running(sdata)) 3889 return false; 3890 3891 rcu_read_lock(); 3892 if (vif->type == NL80211_IFTYPE_AP) { 3893 struct ieee80211_if_ap *ap = &sdata->u.ap; 3894 3895 beacon = rcu_dereference(ap->beacon); 3896 if (WARN_ON(!beacon || !beacon->tail)) 3897 goto out; 3898 beacon_data = beacon->tail; 3899 beacon_data_len = beacon->tail_len; 3900 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3901 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3902 3903 beacon = rcu_dereference(ifibss->presp); 3904 if (!beacon) 3905 goto out; 3906 3907 beacon_data = beacon->head; 3908 beacon_data_len = beacon->head_len; 3909 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3910 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3911 3912 beacon = rcu_dereference(ifmsh->beacon); 3913 if (!beacon) 3914 goto out; 3915 3916 beacon_data = beacon->head; 3917 beacon_data_len = beacon->head_len; 3918 } else { 3919 WARN_ON(1); 3920 goto out; 3921 } 3922 3923 if (!beacon->csa_counter_offsets[0]) 3924 goto out; 3925 3926 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3927 goto out; 3928 3929 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3930 ret = true; 3931 out: 3932 rcu_read_unlock(); 3933 3934 return ret; 3935 } 3936 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3937 3938 static struct sk_buff * 3939 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3940 struct ieee80211_vif *vif, 3941 struct ieee80211_mutable_offsets *offs, 3942 bool is_template) 3943 { 3944 struct ieee80211_local *local = hw_to_local(hw); 3945 struct beacon_data *beacon = NULL; 3946 struct sk_buff *skb = NULL; 3947 struct ieee80211_tx_info *info; 3948 struct ieee80211_sub_if_data *sdata = NULL; 3949 enum nl80211_band band; 3950 struct ieee80211_tx_rate_control txrc; 3951 struct ieee80211_chanctx_conf *chanctx_conf; 3952 int csa_off_base = 0; 3953 3954 rcu_read_lock(); 3955 3956 sdata = vif_to_sdata(vif); 3957 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3958 3959 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3960 goto out; 3961 3962 if (offs) 3963 memset(offs, 0, sizeof(*offs)); 3964 3965 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3966 struct ieee80211_if_ap *ap = &sdata->u.ap; 3967 3968 beacon = rcu_dereference(ap->beacon); 3969 if (beacon) { 3970 if (beacon->csa_counter_offsets[0]) { 3971 if (!is_template) 3972 __ieee80211_csa_update_counter(beacon); 3973 3974 ieee80211_set_csa(sdata, beacon); 3975 } 3976 3977 /* 3978 * headroom, head length, 3979 * tail length and maximum TIM length 3980 */ 3981 skb = dev_alloc_skb(local->tx_headroom + 3982 beacon->head_len + 3983 beacon->tail_len + 256 + 3984 local->hw.extra_beacon_tailroom); 3985 if (!skb) 3986 goto out; 3987 3988 skb_reserve(skb, local->tx_headroom); 3989 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3990 beacon->head_len); 3991 3992 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3993 is_template); 3994 3995 if (offs) { 3996 offs->tim_offset = beacon->head_len; 3997 offs->tim_length = skb->len - beacon->head_len; 3998 3999 /* for AP the csa offsets are from tail */ 4000 csa_off_base = skb->len; 4001 } 4002 4003 if (beacon->tail) 4004 memcpy(skb_put(skb, beacon->tail_len), 4005 beacon->tail, beacon->tail_len); 4006 } else 4007 goto out; 4008 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4009 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4010 struct ieee80211_hdr *hdr; 4011 4012 beacon = rcu_dereference(ifibss->presp); 4013 if (!beacon) 4014 goto out; 4015 4016 if (beacon->csa_counter_offsets[0]) { 4017 if (!is_template) 4018 __ieee80211_csa_update_counter(beacon); 4019 4020 ieee80211_set_csa(sdata, beacon); 4021 } 4022 4023 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4024 local->hw.extra_beacon_tailroom); 4025 if (!skb) 4026 goto out; 4027 skb_reserve(skb, local->tx_headroom); 4028 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4029 beacon->head_len); 4030 4031 hdr = (struct ieee80211_hdr *) skb->data; 4032 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4033 IEEE80211_STYPE_BEACON); 4034 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4035 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4036 4037 beacon = rcu_dereference(ifmsh->beacon); 4038 if (!beacon) 4039 goto out; 4040 4041 if (beacon->csa_counter_offsets[0]) { 4042 if (!is_template) 4043 /* TODO: For mesh csa_counter is in TU, so 4044 * decrementing it by one isn't correct, but 4045 * for now we leave it consistent with overall 4046 * mac80211's behavior. 4047 */ 4048 __ieee80211_csa_update_counter(beacon); 4049 4050 ieee80211_set_csa(sdata, beacon); 4051 } 4052 4053 if (ifmsh->sync_ops) 4054 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 4055 4056 skb = dev_alloc_skb(local->tx_headroom + 4057 beacon->head_len + 4058 256 + /* TIM IE */ 4059 beacon->tail_len + 4060 local->hw.extra_beacon_tailroom); 4061 if (!skb) 4062 goto out; 4063 skb_reserve(skb, local->tx_headroom); 4064 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4065 beacon->head_len); 4066 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4067 4068 if (offs) { 4069 offs->tim_offset = beacon->head_len; 4070 offs->tim_length = skb->len - beacon->head_len; 4071 } 4072 4073 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 4074 beacon->tail_len); 4075 } else { 4076 WARN_ON(1); 4077 goto out; 4078 } 4079 4080 /* CSA offsets */ 4081 if (offs && beacon) { 4082 int i; 4083 4084 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4085 u16 csa_off = beacon->csa_counter_offsets[i]; 4086 4087 if (!csa_off) 4088 continue; 4089 4090 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4091 } 4092 } 4093 4094 band = chanctx_conf->def.chan->band; 4095 4096 info = IEEE80211_SKB_CB(skb); 4097 4098 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4099 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4100 info->band = band; 4101 4102 memset(&txrc, 0, sizeof(txrc)); 4103 txrc.hw = hw; 4104 txrc.sband = local->hw.wiphy->bands[band]; 4105 txrc.bss_conf = &sdata->vif.bss_conf; 4106 txrc.skb = skb; 4107 txrc.reported_rate.idx = -1; 4108 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4109 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 4110 txrc.max_rate_idx = -1; 4111 else 4112 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 4113 txrc.bss = true; 4114 rate_control_get_rate(sdata, NULL, &txrc); 4115 4116 info->control.vif = vif; 4117 4118 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4119 IEEE80211_TX_CTL_ASSIGN_SEQ | 4120 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4121 out: 4122 rcu_read_unlock(); 4123 return skb; 4124 4125 } 4126 4127 struct sk_buff * 4128 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4129 struct ieee80211_vif *vif, 4130 struct ieee80211_mutable_offsets *offs) 4131 { 4132 return __ieee80211_beacon_get(hw, vif, offs, true); 4133 } 4134 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4135 4136 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4137 struct ieee80211_vif *vif, 4138 u16 *tim_offset, u16 *tim_length) 4139 { 4140 struct ieee80211_mutable_offsets offs = {}; 4141 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4142 struct sk_buff *copy; 4143 struct ieee80211_supported_band *sband; 4144 int shift; 4145 4146 if (!bcn) 4147 return bcn; 4148 4149 if (tim_offset) 4150 *tim_offset = offs.tim_offset; 4151 4152 if (tim_length) 4153 *tim_length = offs.tim_length; 4154 4155 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4156 !hw_to_local(hw)->monitors) 4157 return bcn; 4158 4159 /* send a copy to monitor interfaces */ 4160 copy = skb_copy(bcn, GFP_ATOMIC); 4161 if (!copy) 4162 return bcn; 4163 4164 shift = ieee80211_vif_get_shift(vif); 4165 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 4166 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4167 4168 return bcn; 4169 } 4170 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4171 4172 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4173 struct ieee80211_vif *vif) 4174 { 4175 struct ieee80211_if_ap *ap = NULL; 4176 struct sk_buff *skb = NULL; 4177 struct probe_resp *presp = NULL; 4178 struct ieee80211_hdr *hdr; 4179 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4180 4181 if (sdata->vif.type != NL80211_IFTYPE_AP) 4182 return NULL; 4183 4184 rcu_read_lock(); 4185 4186 ap = &sdata->u.ap; 4187 presp = rcu_dereference(ap->probe_resp); 4188 if (!presp) 4189 goto out; 4190 4191 skb = dev_alloc_skb(presp->len); 4192 if (!skb) 4193 goto out; 4194 4195 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4196 4197 hdr = (struct ieee80211_hdr *) skb->data; 4198 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4199 4200 out: 4201 rcu_read_unlock(); 4202 return skb; 4203 } 4204 EXPORT_SYMBOL(ieee80211_proberesp_get); 4205 4206 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4207 struct ieee80211_vif *vif) 4208 { 4209 struct ieee80211_sub_if_data *sdata; 4210 struct ieee80211_if_managed *ifmgd; 4211 struct ieee80211_pspoll *pspoll; 4212 struct ieee80211_local *local; 4213 struct sk_buff *skb; 4214 4215 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4216 return NULL; 4217 4218 sdata = vif_to_sdata(vif); 4219 ifmgd = &sdata->u.mgd; 4220 local = sdata->local; 4221 4222 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4223 if (!skb) 4224 return NULL; 4225 4226 skb_reserve(skb, local->hw.extra_tx_headroom); 4227 4228 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4229 memset(pspoll, 0, sizeof(*pspoll)); 4230 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4231 IEEE80211_STYPE_PSPOLL); 4232 pspoll->aid = cpu_to_le16(ifmgd->aid); 4233 4234 /* aid in PS-Poll has its two MSBs each set to 1 */ 4235 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4236 4237 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4238 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4239 4240 return skb; 4241 } 4242 EXPORT_SYMBOL(ieee80211_pspoll_get); 4243 4244 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4245 struct ieee80211_vif *vif) 4246 { 4247 struct ieee80211_hdr_3addr *nullfunc; 4248 struct ieee80211_sub_if_data *sdata; 4249 struct ieee80211_if_managed *ifmgd; 4250 struct ieee80211_local *local; 4251 struct sk_buff *skb; 4252 4253 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4254 return NULL; 4255 4256 sdata = vif_to_sdata(vif); 4257 ifmgd = &sdata->u.mgd; 4258 local = sdata->local; 4259 4260 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4261 if (!skb) 4262 return NULL; 4263 4264 skb_reserve(skb, local->hw.extra_tx_headroom); 4265 4266 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4267 sizeof(*nullfunc)); 4268 memset(nullfunc, 0, sizeof(*nullfunc)); 4269 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4270 IEEE80211_STYPE_NULLFUNC | 4271 IEEE80211_FCTL_TODS); 4272 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4273 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4274 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4275 4276 return skb; 4277 } 4278 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4279 4280 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4281 const u8 *src_addr, 4282 const u8 *ssid, size_t ssid_len, 4283 size_t tailroom) 4284 { 4285 struct ieee80211_local *local = hw_to_local(hw); 4286 struct ieee80211_hdr_3addr *hdr; 4287 struct sk_buff *skb; 4288 size_t ie_ssid_len; 4289 u8 *pos; 4290 4291 ie_ssid_len = 2 + ssid_len; 4292 4293 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4294 ie_ssid_len + tailroom); 4295 if (!skb) 4296 return NULL; 4297 4298 skb_reserve(skb, local->hw.extra_tx_headroom); 4299 4300 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4301 memset(hdr, 0, sizeof(*hdr)); 4302 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4303 IEEE80211_STYPE_PROBE_REQ); 4304 eth_broadcast_addr(hdr->addr1); 4305 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4306 eth_broadcast_addr(hdr->addr3); 4307 4308 pos = skb_put(skb, ie_ssid_len); 4309 *pos++ = WLAN_EID_SSID; 4310 *pos++ = ssid_len; 4311 if (ssid_len) 4312 memcpy(pos, ssid, ssid_len); 4313 pos += ssid_len; 4314 4315 return skb; 4316 } 4317 EXPORT_SYMBOL(ieee80211_probereq_get); 4318 4319 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4320 const void *frame, size_t frame_len, 4321 const struct ieee80211_tx_info *frame_txctl, 4322 struct ieee80211_rts *rts) 4323 { 4324 const struct ieee80211_hdr *hdr = frame; 4325 4326 rts->frame_control = 4327 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4328 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4329 frame_txctl); 4330 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4331 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4332 } 4333 EXPORT_SYMBOL(ieee80211_rts_get); 4334 4335 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4336 const void *frame, size_t frame_len, 4337 const struct ieee80211_tx_info *frame_txctl, 4338 struct ieee80211_cts *cts) 4339 { 4340 const struct ieee80211_hdr *hdr = frame; 4341 4342 cts->frame_control = 4343 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4344 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4345 frame_len, frame_txctl); 4346 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4347 } 4348 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4349 4350 struct sk_buff * 4351 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4352 struct ieee80211_vif *vif) 4353 { 4354 struct ieee80211_local *local = hw_to_local(hw); 4355 struct sk_buff *skb = NULL; 4356 struct ieee80211_tx_data tx; 4357 struct ieee80211_sub_if_data *sdata; 4358 struct ps_data *ps; 4359 struct ieee80211_tx_info *info; 4360 struct ieee80211_chanctx_conf *chanctx_conf; 4361 4362 sdata = vif_to_sdata(vif); 4363 4364 rcu_read_lock(); 4365 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4366 4367 if (!chanctx_conf) 4368 goto out; 4369 4370 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4371 struct beacon_data *beacon = 4372 rcu_dereference(sdata->u.ap.beacon); 4373 4374 if (!beacon || !beacon->head) 4375 goto out; 4376 4377 ps = &sdata->u.ap.ps; 4378 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4379 ps = &sdata->u.mesh.ps; 4380 } else { 4381 goto out; 4382 } 4383 4384 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4385 goto out; /* send buffered bc/mc only after DTIM beacon */ 4386 4387 while (1) { 4388 skb = skb_dequeue(&ps->bc_buf); 4389 if (!skb) 4390 goto out; 4391 local->total_ps_buffered--; 4392 4393 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4394 struct ieee80211_hdr *hdr = 4395 (struct ieee80211_hdr *) skb->data; 4396 /* more buffered multicast/broadcast frames ==> set 4397 * MoreData flag in IEEE 802.11 header to inform PS 4398 * STAs */ 4399 hdr->frame_control |= 4400 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4401 } 4402 4403 if (sdata->vif.type == NL80211_IFTYPE_AP) 4404 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4405 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4406 break; 4407 ieee80211_free_txskb(hw, skb); 4408 } 4409 4410 info = IEEE80211_SKB_CB(skb); 4411 4412 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4413 info->band = chanctx_conf->def.chan->band; 4414 4415 if (invoke_tx_handlers(&tx)) 4416 skb = NULL; 4417 out: 4418 rcu_read_unlock(); 4419 4420 return skb; 4421 } 4422 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4423 4424 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4425 { 4426 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4427 struct ieee80211_sub_if_data *sdata = sta->sdata; 4428 struct ieee80211_local *local = sdata->local; 4429 int ret; 4430 u32 queues; 4431 4432 lockdep_assert_held(&local->sta_mtx); 4433 4434 /* only some cases are supported right now */ 4435 switch (sdata->vif.type) { 4436 case NL80211_IFTYPE_STATION: 4437 case NL80211_IFTYPE_AP: 4438 case NL80211_IFTYPE_AP_VLAN: 4439 break; 4440 default: 4441 WARN_ON(1); 4442 return -EINVAL; 4443 } 4444 4445 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4446 return -EINVAL; 4447 4448 if (sta->reserved_tid == tid) { 4449 ret = 0; 4450 goto out; 4451 } 4452 4453 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4454 sdata_err(sdata, "TID reservation already active\n"); 4455 ret = -EALREADY; 4456 goto out; 4457 } 4458 4459 ieee80211_stop_vif_queues(sdata->local, sdata, 4460 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4461 4462 synchronize_net(); 4463 4464 /* Tear down BA sessions so we stop aggregating on this TID */ 4465 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4466 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4467 __ieee80211_stop_tx_ba_session(sta, tid, 4468 AGG_STOP_LOCAL_REQUEST); 4469 } 4470 4471 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4472 __ieee80211_flush_queues(local, sdata, queues, false); 4473 4474 sta->reserved_tid = tid; 4475 4476 ieee80211_wake_vif_queues(local, sdata, 4477 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4478 4479 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4480 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4481 4482 ret = 0; 4483 out: 4484 return ret; 4485 } 4486 EXPORT_SYMBOL(ieee80211_reserve_tid); 4487 4488 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4489 { 4490 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4491 struct ieee80211_sub_if_data *sdata = sta->sdata; 4492 4493 lockdep_assert_held(&sdata->local->sta_mtx); 4494 4495 /* only some cases are supported right now */ 4496 switch (sdata->vif.type) { 4497 case NL80211_IFTYPE_STATION: 4498 case NL80211_IFTYPE_AP: 4499 case NL80211_IFTYPE_AP_VLAN: 4500 break; 4501 default: 4502 WARN_ON(1); 4503 return; 4504 } 4505 4506 if (tid != sta->reserved_tid) { 4507 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4508 return; 4509 } 4510 4511 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4512 } 4513 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4514 4515 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4516 struct sk_buff *skb, int tid, 4517 enum nl80211_band band) 4518 { 4519 int ac = ieee802_1d_to_ac[tid & 7]; 4520 4521 skb_reset_mac_header(skb); 4522 skb_set_queue_mapping(skb, ac); 4523 skb->priority = tid; 4524 4525 skb->dev = sdata->dev; 4526 4527 /* 4528 * The other path calling ieee80211_xmit is from the tasklet, 4529 * and while we can handle concurrent transmissions locking 4530 * requirements are that we do not come into tx with bhs on. 4531 */ 4532 local_bh_disable(); 4533 IEEE80211_SKB_CB(skb)->band = band; 4534 ieee80211_xmit(sdata, NULL, skb); 4535 local_bh_enable(); 4536 } 4537