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/if_vlan.h> 20 #include <linux/etherdevice.h> 21 #include <linux/bitmap.h> 22 #include <linux/rcupdate.h> 23 #include <linux/export.h> 24 #include <net/net_namespace.h> 25 #include <net/ieee80211_radiotap.h> 26 #include <net/cfg80211.h> 27 #include <net/mac80211.h> 28 #include <net/codel.h> 29 #include <net/codel_impl.h> 30 #include <asm/unaligned.h> 31 #include <net/fq_impl.h> 32 33 #include "ieee80211_i.h" 34 #include "driver-ops.h" 35 #include "led.h" 36 #include "mesh.h" 37 #include "wep.h" 38 #include "wpa.h" 39 #include "wme.h" 40 #include "rate.h" 41 42 /* misc utils */ 43 44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 45 { 46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 47 48 u64_stats_update_begin(&tstats->syncp); 49 tstats->tx_packets++; 50 tstats->tx_bytes += len; 51 u64_stats_update_end(&tstats->syncp); 52 } 53 54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 55 struct sk_buff *skb, int group_addr, 56 int next_frag_len) 57 { 58 int rate, mrate, erp, dur, i, shift = 0; 59 struct ieee80211_rate *txrate; 60 struct ieee80211_local *local = tx->local; 61 struct ieee80211_supported_band *sband; 62 struct ieee80211_hdr *hdr; 63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 64 struct ieee80211_chanctx_conf *chanctx_conf; 65 u32 rate_flags = 0; 66 67 /* assume HW handles this */ 68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 69 return 0; 70 71 rcu_read_lock(); 72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 73 if (chanctx_conf) { 74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 76 } 77 rcu_read_unlock(); 78 79 /* uh huh? */ 80 if (WARN_ON_ONCE(tx->rate.idx < 0)) 81 return 0; 82 83 sband = local->hw.wiphy->bands[info->band]; 84 txrate = &sband->bitrates[tx->rate.idx]; 85 86 erp = txrate->flags & IEEE80211_RATE_ERP_G; 87 88 /* 89 * data and mgmt (except PS Poll): 90 * - during CFP: 32768 91 * - during contention period: 92 * if addr1 is group address: 0 93 * if more fragments = 0 and addr1 is individual address: time to 94 * transmit one ACK plus SIFS 95 * if more fragments = 1 and addr1 is individual address: time to 96 * transmit next fragment plus 2 x ACK plus 3 x SIFS 97 * 98 * IEEE 802.11, 9.6: 99 * - control response frame (CTS or ACK) shall be transmitted using the 100 * same rate as the immediately previous frame in the frame exchange 101 * sequence, if this rate belongs to the PHY mandatory rates, or else 102 * at the highest possible rate belonging to the PHY rates in the 103 * BSSBasicRateSet 104 */ 105 hdr = (struct ieee80211_hdr *)skb->data; 106 if (ieee80211_is_ctl(hdr->frame_control)) { 107 /* TODO: These control frames are not currently sent by 108 * mac80211, but should they be implemented, this function 109 * needs to be updated to support duration field calculation. 110 * 111 * RTS: time needed to transmit pending data/mgmt frame plus 112 * one CTS frame plus one ACK frame plus 3 x SIFS 113 * CTS: duration of immediately previous RTS minus time 114 * required to transmit CTS and its SIFS 115 * ACK: 0 if immediately previous directed data/mgmt had 116 * more=0, with more=1 duration in ACK frame is duration 117 * from previous frame minus time needed to transmit ACK 118 * and its SIFS 119 * PS Poll: BIT(15) | BIT(14) | aid 120 */ 121 return 0; 122 } 123 124 /* data/mgmt */ 125 if (0 /* FIX: data/mgmt during CFP */) 126 return cpu_to_le16(32768); 127 128 if (group_addr) /* Group address as the destination - no ACK */ 129 return 0; 130 131 /* Individual destination address: 132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 133 * CTS and ACK frames shall be transmitted using the highest rate in 134 * basic rate set that is less than or equal to the rate of the 135 * immediately previous frame and that is using the same modulation 136 * (CCK or OFDM). If no basic rate set matches with these requirements, 137 * the highest mandatory rate of the PHY that is less than or equal to 138 * the rate of the previous frame is used. 139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 140 */ 141 rate = -1; 142 /* use lowest available if everything fails */ 143 mrate = sband->bitrates[0].bitrate; 144 for (i = 0; i < sband->n_bitrates; i++) { 145 struct ieee80211_rate *r = &sband->bitrates[i]; 146 147 if (r->bitrate > txrate->bitrate) 148 break; 149 150 if ((rate_flags & r->flags) != rate_flags) 151 continue; 152 153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 155 156 switch (sband->band) { 157 case NL80211_BAND_2GHZ: { 158 u32 flag; 159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 160 flag = IEEE80211_RATE_MANDATORY_G; 161 else 162 flag = IEEE80211_RATE_MANDATORY_B; 163 if (r->flags & flag) 164 mrate = r->bitrate; 165 break; 166 } 167 case NL80211_BAND_5GHZ: 168 if (r->flags & IEEE80211_RATE_MANDATORY_A) 169 mrate = r->bitrate; 170 break; 171 case NL80211_BAND_60GHZ: 172 /* TODO, for now fall through */ 173 case NUM_NL80211_BANDS: 174 WARN_ON(1); 175 break; 176 } 177 } 178 if (rate == -1) { 179 /* No matching basic rate found; use highest suitable mandatory 180 * PHY rate */ 181 rate = DIV_ROUND_UP(mrate, 1 << shift); 182 } 183 184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 185 if (ieee80211_is_data_qos(hdr->frame_control) && 186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 187 dur = 0; 188 else 189 /* Time needed to transmit ACK 190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 191 * to closest integer */ 192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 193 tx->sdata->vif.bss_conf.use_short_preamble, 194 shift); 195 196 if (next_frag_len) { 197 /* Frame is fragmented: duration increases with time needed to 198 * transmit next fragment plus ACK and 2 x SIFS. */ 199 dur *= 2; /* ACK + SIFS */ 200 /* next fragment */ 201 dur += ieee80211_frame_duration(sband->band, next_frag_len, 202 txrate->bitrate, erp, 203 tx->sdata->vif.bss_conf.use_short_preamble, 204 shift); 205 } 206 207 return cpu_to_le16(dur); 208 } 209 210 /* tx handlers */ 211 static ieee80211_tx_result debug_noinline 212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 213 { 214 struct ieee80211_local *local = tx->local; 215 struct ieee80211_if_managed *ifmgd; 216 217 /* driver doesn't support power save */ 218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 219 return TX_CONTINUE; 220 221 /* hardware does dynamic power save */ 222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 223 return TX_CONTINUE; 224 225 /* dynamic power save disabled */ 226 if (local->hw.conf.dynamic_ps_timeout <= 0) 227 return TX_CONTINUE; 228 229 /* we are scanning, don't enable power save */ 230 if (local->scanning) 231 return TX_CONTINUE; 232 233 if (!local->ps_sdata) 234 return TX_CONTINUE; 235 236 /* No point if we're going to suspend */ 237 if (local->quiescing) 238 return TX_CONTINUE; 239 240 /* dynamic ps is supported only in managed mode */ 241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 242 return TX_CONTINUE; 243 244 ifmgd = &tx->sdata->u.mgd; 245 246 /* 247 * Don't wakeup from power save if u-apsd is enabled, voip ac has 248 * u-apsd enabled and the frame is in voip class. This effectively 249 * means that even if all access categories have u-apsd enabled, in 250 * practise u-apsd is only used with the voip ac. This is a 251 * workaround for the case when received voip class packets do not 252 * have correct qos tag for some reason, due the network or the 253 * peer application. 254 * 255 * Note: ifmgd->uapsd_queues access is racy here. If the value is 256 * changed via debugfs, user needs to reassociate manually to have 257 * everything in sync. 258 */ 259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 262 return TX_CONTINUE; 263 264 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 265 ieee80211_stop_queues_by_reason(&local->hw, 266 IEEE80211_MAX_QUEUE_MAP, 267 IEEE80211_QUEUE_STOP_REASON_PS, 268 false); 269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 270 ieee80211_queue_work(&local->hw, 271 &local->dynamic_ps_disable_work); 272 } 273 274 /* Don't restart the timer if we're not disassociated */ 275 if (!ifmgd->associated) 276 return TX_CONTINUE; 277 278 mod_timer(&local->dynamic_ps_timer, jiffies + 279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 280 281 return TX_CONTINUE; 282 } 283 284 static ieee80211_tx_result debug_noinline 285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 286 { 287 288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 290 bool assoc = false; 291 292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 293 return TX_CONTINUE; 294 295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 297 !ieee80211_is_probe_req(hdr->frame_control) && 298 !ieee80211_is_nullfunc(hdr->frame_control)) 299 /* 300 * When software scanning only nullfunc frames (to notify 301 * the sleep state to the AP) and probe requests (for the 302 * active scan) are allowed, all other frames should not be 303 * sent and we should not get here, but if we do 304 * nonetheless, drop them to avoid sending them 305 * off-channel. See the link below and 306 * ieee80211_start_scan() for more. 307 * 308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 309 */ 310 return TX_DROP; 311 312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 313 return TX_CONTINUE; 314 315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 316 return TX_CONTINUE; 317 318 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 319 return TX_CONTINUE; 320 321 if (tx->sta) 322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 323 324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 325 if (unlikely(!assoc && 326 ieee80211_is_data(hdr->frame_control))) { 327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 328 sdata_info(tx->sdata, 329 "dropped data frame to not associated station %pM\n", 330 hdr->addr1); 331 #endif 332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 333 return TX_DROP; 334 } 335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 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]; 685 686 if (tx->sdata->rc_has_mcs_mask[info->band]) 687 txrc.rate_idx_mcs_mask = 688 tx->sdata->rc_rateidx_mcs_mask[info->band]; 689 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 693 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 /* don't ask rate control when rate already injected via radiotap */ 717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 718 return TX_CONTINUE; 719 720 if (tx->sta) 721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 722 723 /* 724 * Lets not bother rate control if we're associated and cannot 725 * talk to the sta. This should not happen. 726 */ 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 728 !rate_usable_index_exists(sband, &tx->sta->sta), 729 "%s: Dropped data frame as no usable bitrate found while " 730 "scanning and associated. Target station: " 731 "%pM on %d GHz band\n", 732 tx->sdata->name, hdr->addr1, 733 info->band ? 5 : 2)) 734 return TX_DROP; 735 736 /* 737 * If we're associated with the sta at this point we know we can at 738 * least send the frame at the lowest bit rate. 739 */ 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 741 742 if (tx->sta && !info->control.skip_table) 743 ratetbl = rcu_dereference(tx->sta->sta.rates); 744 745 if (unlikely(info->control.rates[0].idx < 0)) { 746 if (ratetbl) { 747 struct ieee80211_tx_rate rate = { 748 .idx = ratetbl->rate[0].idx, 749 .flags = ratetbl->rate[0].flags, 750 .count = ratetbl->rate[0].count 751 }; 752 753 if (ratetbl->rate[0].idx < 0) 754 return TX_DROP; 755 756 tx->rate = rate; 757 } else { 758 return TX_DROP; 759 } 760 } else { 761 tx->rate = info->control.rates[0]; 762 } 763 764 if (txrc.reported_rate.idx < 0) { 765 txrc.reported_rate = tx->rate; 766 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 767 tx->sta->tx_stats.last_rate = txrc.reported_rate; 768 } else if (tx->sta) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 771 if (ratetbl) 772 return TX_CONTINUE; 773 774 if (unlikely(!info->control.rates[0].count)) 775 info->control.rates[0].count = 1; 776 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 778 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 779 info->control.rates[0].count = 1; 780 781 return TX_CONTINUE; 782 } 783 784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 785 { 786 u16 *seq = &sta->tid_seq[tid]; 787 __le16 ret = cpu_to_le16(*seq); 788 789 /* Increase the sequence number. */ 790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 791 792 return ret; 793 } 794 795 static ieee80211_tx_result debug_noinline 796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 797 { 798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 800 u8 *qc; 801 int tid; 802 803 /* 804 * Packet injection may want to control the sequence 805 * number, if we have no matching interface then we 806 * neither assign one ourselves nor ask the driver to. 807 */ 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 809 return TX_CONTINUE; 810 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 812 return TX_CONTINUE; 813 814 if (ieee80211_hdrlen(hdr->frame_control) < 24) 815 return TX_CONTINUE; 816 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 818 return TX_CONTINUE; 819 820 /* 821 * Anything but QoS data that has a sequence number field 822 * (is long enough) gets a sequence number from the global 823 * counter. QoS data frames with a multicast destination 824 * also use the global counter (802.11-2012 9.3.2.10). 825 */ 826 if (!ieee80211_is_data_qos(hdr->frame_control) || 827 is_multicast_ether_addr(hdr->addr1)) { 828 /* driver should assign sequence number */ 829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 830 /* for pure STA mode without beacons, we can do it */ 831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 832 tx->sdata->sequence_number += 0x10; 833 if (tx->sta) 834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 835 return TX_CONTINUE; 836 } 837 838 /* 839 * This should be true for injected/management frames only, for 840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 841 * above since they are not QoS-data frames. 842 */ 843 if (!tx->sta) 844 return TX_CONTINUE; 845 846 /* include per-STA, per-TID sequence counter */ 847 848 qc = ieee80211_get_qos_ctl(hdr); 849 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer && tid_tx->timeout) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 u8 *qc; 1162 1163 memset(tx, 0, sizeof(*tx)); 1164 tx->skb = skb; 1165 tx->local = local; 1166 tx->sdata = sdata; 1167 __skb_queue_head_init(&tx->skbs); 1168 1169 /* 1170 * If this flag is set to true anywhere, and we get here, 1171 * we are doing the needed processing, so remove the flag 1172 * now. 1173 */ 1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1175 1176 hdr = (struct ieee80211_hdr *) skb->data; 1177 1178 if (likely(sta)) { 1179 if (!IS_ERR(sta)) 1180 tx->sta = sta; 1181 } else { 1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1183 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1184 if (!tx->sta && sdata->wdev.use_4addr) 1185 return TX_DROP; 1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1187 IEEE80211_TX_CTL_INJECTED) || 1188 tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 qc = ieee80211_get_qos_ctl(hdr); 1202 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1203 1204 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1205 if (tid_tx) { 1206 bool queued; 1207 1208 queued = ieee80211_tx_prep_agg(tx, skb, info, 1209 tid_tx, tid); 1210 1211 if (unlikely(queued)) 1212 return TX_QUEUED; 1213 } 1214 } 1215 1216 if (is_multicast_ether_addr(hdr->addr1)) { 1217 tx->flags &= ~IEEE80211_TX_UNICAST; 1218 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1219 } else 1220 tx->flags |= IEEE80211_TX_UNICAST; 1221 1222 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1223 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1224 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1225 info->flags & IEEE80211_TX_CTL_AMPDU) 1226 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1227 } 1228 1229 if (!tx->sta) 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1231 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1233 ieee80211_check_fast_xmit(tx->sta); 1234 } 1235 1236 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1237 1238 return TX_CONTINUE; 1239 } 1240 1241 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1242 struct ieee80211_vif *vif, 1243 struct sta_info *sta, 1244 struct sk_buff *skb) 1245 { 1246 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1247 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1248 struct ieee80211_txq *txq = NULL; 1249 1250 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1251 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1252 return NULL; 1253 1254 if (!ieee80211_is_data(hdr->frame_control)) 1255 return NULL; 1256 1257 if (sta) { 1258 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1259 1260 if (!sta->uploaded) 1261 return NULL; 1262 1263 txq = sta->sta.txq[tid]; 1264 } else if (vif) { 1265 txq = vif->txq; 1266 } 1267 1268 if (!txq) 1269 return NULL; 1270 1271 return to_txq_info(txq); 1272 } 1273 1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1275 { 1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1277 } 1278 1279 static u32 codel_skb_len_func(const struct sk_buff *skb) 1280 { 1281 return skb->len; 1282 } 1283 1284 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1285 { 1286 const struct ieee80211_tx_info *info; 1287 1288 info = (const struct ieee80211_tx_info *)skb->cb; 1289 return info->control.enqueue_time; 1290 } 1291 1292 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1293 void *ctx) 1294 { 1295 struct ieee80211_local *local; 1296 struct txq_info *txqi; 1297 struct fq *fq; 1298 struct fq_flow *flow; 1299 1300 txqi = ctx; 1301 local = vif_to_sdata(txqi->txq.vif)->local; 1302 fq = &local->fq; 1303 1304 if (cvars == &txqi->def_cvars) 1305 flow = &txqi->def_flow; 1306 else 1307 flow = &fq->flows[cvars - local->cvars]; 1308 1309 return fq_flow_dequeue(fq, flow); 1310 } 1311 1312 static void codel_drop_func(struct sk_buff *skb, 1313 void *ctx) 1314 { 1315 struct ieee80211_local *local; 1316 struct ieee80211_hw *hw; 1317 struct txq_info *txqi; 1318 1319 txqi = ctx; 1320 local = vif_to_sdata(txqi->txq.vif)->local; 1321 hw = &local->hw; 1322 1323 ieee80211_free_txskb(hw, skb); 1324 } 1325 1326 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1327 struct fq_tin *tin, 1328 struct fq_flow *flow) 1329 { 1330 struct ieee80211_local *local; 1331 struct txq_info *txqi; 1332 struct codel_vars *cvars; 1333 struct codel_params *cparams; 1334 struct codel_stats *cstats; 1335 1336 local = container_of(fq, struct ieee80211_local, fq); 1337 txqi = container_of(tin, struct txq_info, tin); 1338 cstats = &txqi->cstats; 1339 1340 if (txqi->txq.sta) { 1341 struct sta_info *sta = container_of(txqi->txq.sta, 1342 struct sta_info, sta); 1343 cparams = &sta->cparams; 1344 } else { 1345 cparams = &local->cparams; 1346 } 1347 1348 if (flow == &txqi->def_flow) 1349 cvars = &txqi->def_cvars; 1350 else 1351 cvars = &local->cvars[flow - fq->flows]; 1352 1353 return codel_dequeue(txqi, 1354 &flow->backlog, 1355 cparams, 1356 cvars, 1357 cstats, 1358 codel_skb_len_func, 1359 codel_skb_time_func, 1360 codel_drop_func, 1361 codel_dequeue_func); 1362 } 1363 1364 static void fq_skb_free_func(struct fq *fq, 1365 struct fq_tin *tin, 1366 struct fq_flow *flow, 1367 struct sk_buff *skb) 1368 { 1369 struct ieee80211_local *local; 1370 1371 local = container_of(fq, struct ieee80211_local, fq); 1372 ieee80211_free_txskb(&local->hw, skb); 1373 } 1374 1375 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1376 struct fq_tin *tin, 1377 int idx, 1378 struct sk_buff *skb) 1379 { 1380 struct txq_info *txqi; 1381 1382 txqi = container_of(tin, struct txq_info, tin); 1383 return &txqi->def_flow; 1384 } 1385 1386 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1387 struct txq_info *txqi, 1388 struct sk_buff *skb) 1389 { 1390 struct fq *fq = &local->fq; 1391 struct fq_tin *tin = &txqi->tin; 1392 1393 ieee80211_set_skb_enqueue_time(skb); 1394 fq_tin_enqueue(fq, tin, skb, 1395 fq_skb_free_func, 1396 fq_flow_get_default_func); 1397 } 1398 1399 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1400 struct fq_flow *flow, struct sk_buff *skb, 1401 void *data) 1402 { 1403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1404 1405 return info->control.vif == data; 1406 } 1407 1408 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1409 struct ieee80211_sub_if_data *sdata) 1410 { 1411 struct fq *fq = &local->fq; 1412 struct txq_info *txqi; 1413 struct fq_tin *tin; 1414 struct ieee80211_sub_if_data *ap; 1415 1416 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1417 return; 1418 1419 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1420 1421 if (!ap->vif.txq) 1422 return; 1423 1424 txqi = to_txq_info(ap->vif.txq); 1425 tin = &txqi->tin; 1426 1427 spin_lock_bh(&fq->lock); 1428 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1429 fq_skb_free_func); 1430 spin_unlock_bh(&fq->lock); 1431 } 1432 1433 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1434 struct sta_info *sta, 1435 struct txq_info *txqi, int tid) 1436 { 1437 fq_tin_init(&txqi->tin); 1438 fq_flow_init(&txqi->def_flow); 1439 codel_vars_init(&txqi->def_cvars); 1440 codel_stats_init(&txqi->cstats); 1441 __skb_queue_head_init(&txqi->frags); 1442 1443 txqi->txq.vif = &sdata->vif; 1444 1445 if (sta) { 1446 txqi->txq.sta = &sta->sta; 1447 sta->sta.txq[tid] = &txqi->txq; 1448 txqi->txq.tid = tid; 1449 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1450 } else { 1451 sdata->vif.txq = &txqi->txq; 1452 txqi->txq.tid = 0; 1453 txqi->txq.ac = IEEE80211_AC_BE; 1454 } 1455 } 1456 1457 void ieee80211_txq_purge(struct ieee80211_local *local, 1458 struct txq_info *txqi) 1459 { 1460 struct fq *fq = &local->fq; 1461 struct fq_tin *tin = &txqi->tin; 1462 1463 fq_tin_reset(fq, tin, fq_skb_free_func); 1464 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1465 } 1466 1467 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1468 { 1469 struct fq *fq = &local->fq; 1470 int ret; 1471 int i; 1472 bool supp_vht = false; 1473 enum nl80211_band band; 1474 1475 if (!local->ops->wake_tx_queue) 1476 return 0; 1477 1478 ret = fq_init(fq, 4096); 1479 if (ret) 1480 return ret; 1481 1482 /* 1483 * If the hardware doesn't support VHT, it is safe to limit the maximum 1484 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1485 */ 1486 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1487 struct ieee80211_supported_band *sband; 1488 1489 sband = local->hw.wiphy->bands[band]; 1490 if (!sband) 1491 continue; 1492 1493 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1494 } 1495 1496 if (!supp_vht) 1497 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1498 1499 codel_params_init(&local->cparams); 1500 local->cparams.interval = MS2TIME(100); 1501 local->cparams.target = MS2TIME(20); 1502 local->cparams.ecn = true; 1503 1504 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1505 GFP_KERNEL); 1506 if (!local->cvars) { 1507 spin_lock_bh(&fq->lock); 1508 fq_reset(fq, fq_skb_free_func); 1509 spin_unlock_bh(&fq->lock); 1510 return -ENOMEM; 1511 } 1512 1513 for (i = 0; i < fq->flows_cnt; i++) 1514 codel_vars_init(&local->cvars[i]); 1515 1516 return 0; 1517 } 1518 1519 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1520 { 1521 struct fq *fq = &local->fq; 1522 1523 if (!local->ops->wake_tx_queue) 1524 return; 1525 1526 kfree(local->cvars); 1527 local->cvars = NULL; 1528 1529 spin_lock_bh(&fq->lock); 1530 fq_reset(fq, fq_skb_free_func); 1531 spin_unlock_bh(&fq->lock); 1532 } 1533 1534 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1535 struct ieee80211_sub_if_data *sdata, 1536 struct sta_info *sta, 1537 struct sk_buff *skb) 1538 { 1539 struct fq *fq = &local->fq; 1540 struct ieee80211_vif *vif; 1541 struct txq_info *txqi; 1542 1543 if (!local->ops->wake_tx_queue || 1544 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1545 return false; 1546 1547 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1548 sdata = container_of(sdata->bss, 1549 struct ieee80211_sub_if_data, u.ap); 1550 1551 vif = &sdata->vif; 1552 txqi = ieee80211_get_txq(local, vif, sta, skb); 1553 1554 if (!txqi) 1555 return false; 1556 1557 spin_lock_bh(&fq->lock); 1558 ieee80211_txq_enqueue(local, txqi, skb); 1559 spin_unlock_bh(&fq->lock); 1560 1561 drv_wake_tx_queue(local, txqi); 1562 1563 return true; 1564 } 1565 1566 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1567 struct ieee80211_vif *vif, 1568 struct ieee80211_sta *sta, 1569 struct sk_buff_head *skbs, 1570 bool txpending) 1571 { 1572 struct ieee80211_tx_control control = {}; 1573 struct sk_buff *skb, *tmp; 1574 unsigned long flags; 1575 1576 skb_queue_walk_safe(skbs, skb, tmp) { 1577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1578 int q = info->hw_queue; 1579 1580 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1581 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1582 __skb_unlink(skb, skbs); 1583 ieee80211_free_txskb(&local->hw, skb); 1584 continue; 1585 } 1586 #endif 1587 1588 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1589 if (local->queue_stop_reasons[q] || 1590 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1591 if (unlikely(info->flags & 1592 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1593 if (local->queue_stop_reasons[q] & 1594 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1595 /* 1596 * Drop off-channel frames if queues 1597 * are stopped for any reason other 1598 * than off-channel operation. Never 1599 * queue them. 1600 */ 1601 spin_unlock_irqrestore( 1602 &local->queue_stop_reason_lock, 1603 flags); 1604 ieee80211_purge_tx_queue(&local->hw, 1605 skbs); 1606 return true; 1607 } 1608 } else { 1609 1610 /* 1611 * Since queue is stopped, queue up frames for 1612 * later transmission from the tx-pending 1613 * tasklet when the queue is woken again. 1614 */ 1615 if (txpending) 1616 skb_queue_splice_init(skbs, 1617 &local->pending[q]); 1618 else 1619 skb_queue_splice_tail_init(skbs, 1620 &local->pending[q]); 1621 1622 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1623 flags); 1624 return false; 1625 } 1626 } 1627 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1628 1629 info->control.vif = vif; 1630 control.sta = sta; 1631 1632 __skb_unlink(skb, skbs); 1633 drv_tx(local, &control, skb); 1634 } 1635 1636 return true; 1637 } 1638 1639 /* 1640 * Returns false if the frame couldn't be transmitted but was queued instead. 1641 */ 1642 static bool __ieee80211_tx(struct ieee80211_local *local, 1643 struct sk_buff_head *skbs, int led_len, 1644 struct sta_info *sta, bool txpending) 1645 { 1646 struct ieee80211_tx_info *info; 1647 struct ieee80211_sub_if_data *sdata; 1648 struct ieee80211_vif *vif; 1649 struct ieee80211_sta *pubsta; 1650 struct sk_buff *skb; 1651 bool result = true; 1652 __le16 fc; 1653 1654 if (WARN_ON(skb_queue_empty(skbs))) 1655 return true; 1656 1657 skb = skb_peek(skbs); 1658 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1659 info = IEEE80211_SKB_CB(skb); 1660 sdata = vif_to_sdata(info->control.vif); 1661 if (sta && !sta->uploaded) 1662 sta = NULL; 1663 1664 if (sta) 1665 pubsta = &sta->sta; 1666 else 1667 pubsta = NULL; 1668 1669 switch (sdata->vif.type) { 1670 case NL80211_IFTYPE_MONITOR: 1671 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1672 vif = &sdata->vif; 1673 break; 1674 } 1675 sdata = rcu_dereference(local->monitor_sdata); 1676 if (sdata) { 1677 vif = &sdata->vif; 1678 info->hw_queue = 1679 vif->hw_queue[skb_get_queue_mapping(skb)]; 1680 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1681 ieee80211_purge_tx_queue(&local->hw, skbs); 1682 return true; 1683 } else 1684 vif = NULL; 1685 break; 1686 case NL80211_IFTYPE_AP_VLAN: 1687 sdata = container_of(sdata->bss, 1688 struct ieee80211_sub_if_data, u.ap); 1689 /* fall through */ 1690 default: 1691 vif = &sdata->vif; 1692 break; 1693 } 1694 1695 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1696 txpending); 1697 1698 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1699 1700 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1701 1702 return result; 1703 } 1704 1705 /* 1706 * Invoke TX handlers, return 0 on success and non-zero if the 1707 * frame was dropped or queued. 1708 * 1709 * The handlers are split into an early and late part. The latter is everything 1710 * that can be sensitive to reordering, and will be deferred to after packets 1711 * are dequeued from the intermediate queues (when they are enabled). 1712 */ 1713 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1714 { 1715 ieee80211_tx_result res = TX_DROP; 1716 1717 #define CALL_TXH(txh) \ 1718 do { \ 1719 res = txh(tx); \ 1720 if (res != TX_CONTINUE) \ 1721 goto txh_done; \ 1722 } while (0) 1723 1724 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1725 CALL_TXH(ieee80211_tx_h_check_assoc); 1726 CALL_TXH(ieee80211_tx_h_ps_buf); 1727 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1728 CALL_TXH(ieee80211_tx_h_select_key); 1729 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1730 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1731 1732 txh_done: 1733 if (unlikely(res == TX_DROP)) { 1734 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1735 if (tx->skb) 1736 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1737 else 1738 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1739 return -1; 1740 } else if (unlikely(res == TX_QUEUED)) { 1741 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1742 return -1; 1743 } 1744 1745 return 0; 1746 } 1747 1748 /* 1749 * Late handlers can be called while the sta lock is held. Handlers that can 1750 * cause packets to be generated will cause deadlock! 1751 */ 1752 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1753 { 1754 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1755 ieee80211_tx_result res = TX_CONTINUE; 1756 1757 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1758 __skb_queue_tail(&tx->skbs, tx->skb); 1759 tx->skb = NULL; 1760 goto txh_done; 1761 } 1762 1763 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1764 CALL_TXH(ieee80211_tx_h_sequence); 1765 CALL_TXH(ieee80211_tx_h_fragment); 1766 /* handlers after fragment must be aware of tx info fragmentation! */ 1767 CALL_TXH(ieee80211_tx_h_stats); 1768 CALL_TXH(ieee80211_tx_h_encrypt); 1769 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1770 CALL_TXH(ieee80211_tx_h_calculate_duration); 1771 #undef CALL_TXH 1772 1773 txh_done: 1774 if (unlikely(res == TX_DROP)) { 1775 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1776 if (tx->skb) 1777 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1778 else 1779 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1780 return -1; 1781 } else if (unlikely(res == TX_QUEUED)) { 1782 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1783 return -1; 1784 } 1785 1786 return 0; 1787 } 1788 1789 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1790 { 1791 int r = invoke_tx_handlers_early(tx); 1792 1793 if (r) 1794 return r; 1795 return invoke_tx_handlers_late(tx); 1796 } 1797 1798 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1799 struct ieee80211_vif *vif, struct sk_buff *skb, 1800 int band, struct ieee80211_sta **sta) 1801 { 1802 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1803 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1804 struct ieee80211_tx_data tx; 1805 struct sk_buff *skb2; 1806 1807 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1808 return false; 1809 1810 info->band = band; 1811 info->control.vif = vif; 1812 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1813 1814 if (invoke_tx_handlers(&tx)) 1815 return false; 1816 1817 if (sta) { 1818 if (tx.sta) 1819 *sta = &tx.sta->sta; 1820 else 1821 *sta = NULL; 1822 } 1823 1824 /* this function isn't suitable for fragmented data frames */ 1825 skb2 = __skb_dequeue(&tx.skbs); 1826 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1827 ieee80211_free_txskb(hw, skb2); 1828 ieee80211_purge_tx_queue(hw, &tx.skbs); 1829 return false; 1830 } 1831 1832 return true; 1833 } 1834 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1835 1836 /* 1837 * Returns false if the frame couldn't be transmitted but was queued instead. 1838 */ 1839 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1840 struct sta_info *sta, struct sk_buff *skb, 1841 bool txpending) 1842 { 1843 struct ieee80211_local *local = sdata->local; 1844 struct ieee80211_tx_data tx; 1845 ieee80211_tx_result res_prepare; 1846 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1847 bool result = true; 1848 int led_len; 1849 1850 if (unlikely(skb->len < 10)) { 1851 dev_kfree_skb(skb); 1852 return true; 1853 } 1854 1855 /* initialises tx */ 1856 led_len = skb->len; 1857 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1858 1859 if (unlikely(res_prepare == TX_DROP)) { 1860 ieee80211_free_txskb(&local->hw, skb); 1861 return true; 1862 } else if (unlikely(res_prepare == TX_QUEUED)) { 1863 return true; 1864 } 1865 1866 /* set up hw_queue value early */ 1867 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1868 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1869 info->hw_queue = 1870 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1871 1872 if (invoke_tx_handlers_early(&tx)) 1873 return false; 1874 1875 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1876 return true; 1877 1878 if (!invoke_tx_handlers_late(&tx)) 1879 result = __ieee80211_tx(local, &tx.skbs, led_len, 1880 tx.sta, txpending); 1881 1882 return result; 1883 } 1884 1885 /* device xmit handlers */ 1886 1887 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1888 struct sk_buff *skb, 1889 int head_need, bool may_encrypt) 1890 { 1891 struct ieee80211_local *local = sdata->local; 1892 int tail_need = 0; 1893 1894 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1895 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1896 tail_need -= skb_tailroom(skb); 1897 tail_need = max_t(int, tail_need, 0); 1898 } 1899 1900 if (skb_cloned(skb) && 1901 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1902 !skb_clone_writable(skb, ETH_HLEN) || 1903 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1904 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1905 else if (head_need || tail_need) 1906 I802_DEBUG_INC(local->tx_expand_skb_head); 1907 else 1908 return 0; 1909 1910 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1911 wiphy_debug(local->hw.wiphy, 1912 "failed to reallocate TX buffer\n"); 1913 return -ENOMEM; 1914 } 1915 1916 return 0; 1917 } 1918 1919 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1920 struct sta_info *sta, struct sk_buff *skb) 1921 { 1922 struct ieee80211_local *local = sdata->local; 1923 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1925 int headroom; 1926 bool may_encrypt; 1927 1928 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1929 1930 headroom = local->tx_headroom; 1931 if (may_encrypt) 1932 headroom += sdata->encrypt_headroom; 1933 headroom -= skb_headroom(skb); 1934 headroom = max_t(int, 0, headroom); 1935 1936 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1937 ieee80211_free_txskb(&local->hw, skb); 1938 return; 1939 } 1940 1941 hdr = (struct ieee80211_hdr *) skb->data; 1942 info->control.vif = &sdata->vif; 1943 1944 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1945 if (ieee80211_is_data(hdr->frame_control) && 1946 is_unicast_ether_addr(hdr->addr1)) { 1947 if (mesh_nexthop_resolve(sdata, skb)) 1948 return; /* skb queued: don't free */ 1949 } else { 1950 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1951 } 1952 } 1953 1954 ieee80211_set_qos_hdr(sdata, skb); 1955 ieee80211_tx(sdata, sta, skb, false); 1956 } 1957 1958 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1959 struct sk_buff *skb) 1960 { 1961 struct ieee80211_radiotap_iterator iterator; 1962 struct ieee80211_radiotap_header *rthdr = 1963 (struct ieee80211_radiotap_header *) skb->data; 1964 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1965 struct ieee80211_supported_band *sband = 1966 local->hw.wiphy->bands[info->band]; 1967 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1968 NULL); 1969 u16 txflags; 1970 u16 rate = 0; 1971 bool rate_found = false; 1972 u8 rate_retries = 0; 1973 u16 rate_flags = 0; 1974 u8 mcs_known, mcs_flags, mcs_bw; 1975 u16 vht_known; 1976 u8 vht_mcs = 0, vht_nss = 0; 1977 int i; 1978 1979 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1980 IEEE80211_TX_CTL_DONTFRAG; 1981 1982 /* 1983 * for every radiotap entry that is present 1984 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1985 * entries present, or -EINVAL on error) 1986 */ 1987 1988 while (!ret) { 1989 ret = ieee80211_radiotap_iterator_next(&iterator); 1990 1991 if (ret) 1992 continue; 1993 1994 /* see if this argument is something we can use */ 1995 switch (iterator.this_arg_index) { 1996 /* 1997 * You must take care when dereferencing iterator.this_arg 1998 * for multibyte types... the pointer is not aligned. Use 1999 * get_unaligned((type *)iterator.this_arg) to dereference 2000 * iterator.this_arg for type "type" safely on all arches. 2001 */ 2002 case IEEE80211_RADIOTAP_FLAGS: 2003 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2004 /* 2005 * this indicates that the skb we have been 2006 * handed has the 32-bit FCS CRC at the end... 2007 * we should react to that by snipping it off 2008 * because it will be recomputed and added 2009 * on transmission 2010 */ 2011 if (skb->len < (iterator._max_length + FCS_LEN)) 2012 return false; 2013 2014 skb_trim(skb, skb->len - FCS_LEN); 2015 } 2016 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2017 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2018 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2019 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2020 break; 2021 2022 case IEEE80211_RADIOTAP_TX_FLAGS: 2023 txflags = get_unaligned_le16(iterator.this_arg); 2024 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2025 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2026 break; 2027 2028 case IEEE80211_RADIOTAP_RATE: 2029 rate = *iterator.this_arg; 2030 rate_flags = 0; 2031 rate_found = true; 2032 break; 2033 2034 case IEEE80211_RADIOTAP_DATA_RETRIES: 2035 rate_retries = *iterator.this_arg; 2036 break; 2037 2038 case IEEE80211_RADIOTAP_MCS: 2039 mcs_known = iterator.this_arg[0]; 2040 mcs_flags = iterator.this_arg[1]; 2041 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2042 break; 2043 2044 rate_found = true; 2045 rate = iterator.this_arg[2]; 2046 rate_flags = IEEE80211_TX_RC_MCS; 2047 2048 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2049 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2050 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2051 2052 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2053 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2054 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2055 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2056 break; 2057 2058 case IEEE80211_RADIOTAP_VHT: 2059 vht_known = get_unaligned_le16(iterator.this_arg); 2060 rate_found = true; 2061 2062 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2063 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2064 (iterator.this_arg[2] & 2065 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2066 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2067 if (vht_known & 2068 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2069 if (iterator.this_arg[3] == 1) 2070 rate_flags |= 2071 IEEE80211_TX_RC_40_MHZ_WIDTH; 2072 else if (iterator.this_arg[3] == 4) 2073 rate_flags |= 2074 IEEE80211_TX_RC_80_MHZ_WIDTH; 2075 else if (iterator.this_arg[3] == 11) 2076 rate_flags |= 2077 IEEE80211_TX_RC_160_MHZ_WIDTH; 2078 } 2079 2080 vht_mcs = iterator.this_arg[4] >> 4; 2081 vht_nss = iterator.this_arg[4] & 0xF; 2082 break; 2083 2084 /* 2085 * Please update the file 2086 * Documentation/networking/mac80211-injection.txt 2087 * when parsing new fields here. 2088 */ 2089 2090 default: 2091 break; 2092 } 2093 } 2094 2095 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2096 return false; 2097 2098 if (rate_found) { 2099 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2100 2101 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2102 info->control.rates[i].idx = -1; 2103 info->control.rates[i].flags = 0; 2104 info->control.rates[i].count = 0; 2105 } 2106 2107 if (rate_flags & IEEE80211_TX_RC_MCS) { 2108 info->control.rates[0].idx = rate; 2109 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2110 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2111 vht_nss); 2112 } else { 2113 for (i = 0; i < sband->n_bitrates; i++) { 2114 if (rate * 5 != sband->bitrates[i].bitrate) 2115 continue; 2116 2117 info->control.rates[0].idx = i; 2118 break; 2119 } 2120 } 2121 2122 if (info->control.rates[0].idx < 0) 2123 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2124 2125 info->control.rates[0].flags = rate_flags; 2126 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2127 local->hw.max_rate_tries); 2128 } 2129 2130 /* 2131 * remove the radiotap header 2132 * iterator->_max_length was sanity-checked against 2133 * skb->len by iterator init 2134 */ 2135 skb_pull(skb, iterator._max_length); 2136 2137 return true; 2138 } 2139 2140 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2141 struct net_device *dev) 2142 { 2143 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2144 struct ieee80211_chanctx_conf *chanctx_conf; 2145 struct ieee80211_radiotap_header *prthdr = 2146 (struct ieee80211_radiotap_header *)skb->data; 2147 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2148 struct ieee80211_hdr *hdr; 2149 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2150 struct cfg80211_chan_def *chandef; 2151 u16 len_rthdr; 2152 int hdrlen; 2153 2154 /* check for not even having the fixed radiotap header part */ 2155 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2156 goto fail; /* too short to be possibly valid */ 2157 2158 /* is it a header version we can trust to find length from? */ 2159 if (unlikely(prthdr->it_version)) 2160 goto fail; /* only version 0 is supported */ 2161 2162 /* then there must be a radiotap header with a length we can use */ 2163 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2164 2165 /* does the skb contain enough to deliver on the alleged length? */ 2166 if (unlikely(skb->len < len_rthdr)) 2167 goto fail; /* skb too short for claimed rt header extent */ 2168 2169 /* 2170 * fix up the pointers accounting for the radiotap 2171 * header still being in there. We are being given 2172 * a precooked IEEE80211 header so no need for 2173 * normal processing 2174 */ 2175 skb_set_mac_header(skb, len_rthdr); 2176 /* 2177 * these are just fixed to the end of the rt area since we 2178 * don't have any better information and at this point, nobody cares 2179 */ 2180 skb_set_network_header(skb, len_rthdr); 2181 skb_set_transport_header(skb, len_rthdr); 2182 2183 if (skb->len < len_rthdr + 2) 2184 goto fail; 2185 2186 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2187 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2188 2189 if (skb->len < len_rthdr + hdrlen) 2190 goto fail; 2191 2192 /* 2193 * Initialize skb->protocol if the injected frame is a data frame 2194 * carrying a rfc1042 header 2195 */ 2196 if (ieee80211_is_data(hdr->frame_control) && 2197 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2198 u8 *payload = (u8 *)hdr + hdrlen; 2199 2200 if (ether_addr_equal(payload, rfc1042_header)) 2201 skb->protocol = cpu_to_be16((payload[6] << 8) | 2202 payload[7]); 2203 } 2204 2205 memset(info, 0, sizeof(*info)); 2206 2207 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2208 IEEE80211_TX_CTL_INJECTED; 2209 2210 rcu_read_lock(); 2211 2212 /* 2213 * We process outgoing injected frames that have a local address 2214 * we handle as though they are non-injected frames. 2215 * This code here isn't entirely correct, the local MAC address 2216 * isn't always enough to find the interface to use; for proper 2217 * VLAN/WDS support we will need a different mechanism (which 2218 * likely isn't going to be monitor interfaces). 2219 */ 2220 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2221 2222 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2223 if (!ieee80211_sdata_running(tmp_sdata)) 2224 continue; 2225 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2226 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2227 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2228 continue; 2229 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2230 sdata = tmp_sdata; 2231 break; 2232 } 2233 } 2234 2235 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2236 if (!chanctx_conf) { 2237 tmp_sdata = rcu_dereference(local->monitor_sdata); 2238 if (tmp_sdata) 2239 chanctx_conf = 2240 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2241 } 2242 2243 if (chanctx_conf) 2244 chandef = &chanctx_conf->def; 2245 else if (!local->use_chanctx) 2246 chandef = &local->_oper_chandef; 2247 else 2248 goto fail_rcu; 2249 2250 /* 2251 * Frame injection is not allowed if beaconing is not allowed 2252 * or if we need radar detection. Beaconing is usually not allowed when 2253 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2254 * Passive scan is also used in world regulatory domains where 2255 * your country is not known and as such it should be treated as 2256 * NO TX unless the channel is explicitly allowed in which case 2257 * your current regulatory domain would not have the passive scan 2258 * flag. 2259 * 2260 * Since AP mode uses monitor interfaces to inject/TX management 2261 * frames we can make AP mode the exception to this rule once it 2262 * supports radar detection as its implementation can deal with 2263 * radar detection by itself. We can do that later by adding a 2264 * monitor flag interfaces used for AP support. 2265 */ 2266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2267 sdata->vif.type)) 2268 goto fail_rcu; 2269 2270 info->band = chandef->chan->band; 2271 2272 /* process and remove the injection radiotap header */ 2273 if (!ieee80211_parse_tx_radiotap(local, skb)) 2274 goto fail_rcu; 2275 2276 ieee80211_xmit(sdata, NULL, skb); 2277 rcu_read_unlock(); 2278 2279 return NETDEV_TX_OK; 2280 2281 fail_rcu: 2282 rcu_read_unlock(); 2283 fail: 2284 dev_kfree_skb(skb); 2285 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2286 } 2287 2288 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2289 { 2290 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2291 2292 return ethertype == ETH_P_TDLS && 2293 skb->len > 14 && 2294 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2295 } 2296 2297 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2298 struct sk_buff *skb, 2299 struct sta_info **sta_out) 2300 { 2301 struct sta_info *sta; 2302 2303 switch (sdata->vif.type) { 2304 case NL80211_IFTYPE_AP_VLAN: 2305 sta = rcu_dereference(sdata->u.vlan.sta); 2306 if (sta) { 2307 *sta_out = sta; 2308 return 0; 2309 } else if (sdata->wdev.use_4addr) { 2310 return -ENOLINK; 2311 } 2312 /* fall through */ 2313 case NL80211_IFTYPE_AP: 2314 case NL80211_IFTYPE_OCB: 2315 case NL80211_IFTYPE_ADHOC: 2316 if (is_multicast_ether_addr(skb->data)) { 2317 *sta_out = ERR_PTR(-ENOENT); 2318 return 0; 2319 } 2320 sta = sta_info_get_bss(sdata, skb->data); 2321 break; 2322 case NL80211_IFTYPE_WDS: 2323 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2324 break; 2325 #ifdef CONFIG_MAC80211_MESH 2326 case NL80211_IFTYPE_MESH_POINT: 2327 /* determined much later */ 2328 *sta_out = NULL; 2329 return 0; 2330 #endif 2331 case NL80211_IFTYPE_STATION: 2332 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2333 sta = sta_info_get(sdata, skb->data); 2334 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2335 if (test_sta_flag(sta, 2336 WLAN_STA_TDLS_PEER_AUTH)) { 2337 *sta_out = sta; 2338 return 0; 2339 } 2340 2341 /* 2342 * TDLS link during setup - throw out frames to 2343 * peer. Allow TDLS-setup frames to unauthorized 2344 * peers for the special case of a link teardown 2345 * after a TDLS sta is removed due to being 2346 * unreachable. 2347 */ 2348 if (!ieee80211_is_tdls_setup(skb)) 2349 return -EINVAL; 2350 } 2351 2352 } 2353 2354 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2355 if (!sta) 2356 return -ENOLINK; 2357 break; 2358 default: 2359 return -EINVAL; 2360 } 2361 2362 *sta_out = sta ?: ERR_PTR(-ENOENT); 2363 return 0; 2364 } 2365 2366 /** 2367 * ieee80211_build_hdr - build 802.11 header in the given frame 2368 * @sdata: virtual interface to build the header for 2369 * @skb: the skb to build the header in 2370 * @info_flags: skb flags to set 2371 * 2372 * This function takes the skb with 802.3 header and reformats the header to 2373 * the appropriate IEEE 802.11 header based on which interface the packet is 2374 * being transmitted on. 2375 * 2376 * Note that this function also takes care of the TX status request and 2377 * potential unsharing of the SKB - this needs to be interleaved with the 2378 * header building. 2379 * 2380 * The function requires the read-side RCU lock held 2381 * 2382 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2383 */ 2384 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2385 struct sk_buff *skb, u32 info_flags, 2386 struct sta_info *sta) 2387 { 2388 struct ieee80211_local *local = sdata->local; 2389 struct ieee80211_tx_info *info; 2390 int head_need; 2391 u16 ethertype, hdrlen, meshhdrlen = 0; 2392 __le16 fc; 2393 struct ieee80211_hdr hdr; 2394 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2395 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2396 const u8 *encaps_data; 2397 int encaps_len, skip_header_bytes; 2398 bool wme_sta = false, authorized = false; 2399 bool tdls_peer; 2400 bool multicast; 2401 u16 info_id = 0; 2402 struct ieee80211_chanctx_conf *chanctx_conf; 2403 struct ieee80211_sub_if_data *ap_sdata; 2404 enum nl80211_band band; 2405 int ret; 2406 2407 if (IS_ERR(sta)) 2408 sta = NULL; 2409 2410 /* convert Ethernet header to proper 802.11 header (based on 2411 * operation mode) */ 2412 ethertype = (skb->data[12] << 8) | skb->data[13]; 2413 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2414 2415 switch (sdata->vif.type) { 2416 case NL80211_IFTYPE_AP_VLAN: 2417 if (sdata->wdev.use_4addr) { 2418 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2419 /* RA TA DA SA */ 2420 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2421 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2422 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2423 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2424 hdrlen = 30; 2425 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2426 wme_sta = sta->sta.wme; 2427 } 2428 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2429 u.ap); 2430 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2431 if (!chanctx_conf) { 2432 ret = -ENOTCONN; 2433 goto free; 2434 } 2435 band = chanctx_conf->def.chan->band; 2436 if (sdata->wdev.use_4addr) 2437 break; 2438 /* fall through */ 2439 case NL80211_IFTYPE_AP: 2440 if (sdata->vif.type == NL80211_IFTYPE_AP) 2441 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2442 if (!chanctx_conf) { 2443 ret = -ENOTCONN; 2444 goto free; 2445 } 2446 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2447 /* DA BSSID SA */ 2448 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2449 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2450 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2451 hdrlen = 24; 2452 band = chanctx_conf->def.chan->band; 2453 break; 2454 case NL80211_IFTYPE_WDS: 2455 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2456 /* RA TA DA SA */ 2457 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2458 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2459 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2460 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2461 hdrlen = 30; 2462 /* 2463 * This is the exception! WDS style interfaces are prohibited 2464 * when channel contexts are in used so this must be valid 2465 */ 2466 band = local->hw.conf.chandef.chan->band; 2467 break; 2468 #ifdef CONFIG_MAC80211_MESH 2469 case NL80211_IFTYPE_MESH_POINT: 2470 if (!is_multicast_ether_addr(skb->data)) { 2471 struct sta_info *next_hop; 2472 bool mpp_lookup = true; 2473 2474 mpath = mesh_path_lookup(sdata, skb->data); 2475 if (mpath) { 2476 mpp_lookup = false; 2477 next_hop = rcu_dereference(mpath->next_hop); 2478 if (!next_hop || 2479 !(mpath->flags & (MESH_PATH_ACTIVE | 2480 MESH_PATH_RESOLVING))) 2481 mpp_lookup = true; 2482 } 2483 2484 if (mpp_lookup) { 2485 mppath = mpp_path_lookup(sdata, skb->data); 2486 if (mppath) 2487 mppath->exp_time = jiffies; 2488 } 2489 2490 if (mppath && mpath) 2491 mesh_path_del(sdata, mpath->dst); 2492 } 2493 2494 /* 2495 * Use address extension if it is a packet from 2496 * another interface or if we know the destination 2497 * is being proxied by a portal (i.e. portal address 2498 * differs from proxied address) 2499 */ 2500 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2501 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2502 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2503 skb->data, skb->data + ETH_ALEN); 2504 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2505 NULL, NULL); 2506 } else { 2507 /* DS -> MBSS (802.11-2012 13.11.3.3). 2508 * For unicast with unknown forwarding information, 2509 * destination might be in the MBSS or if that fails 2510 * forwarded to another mesh gate. In either case 2511 * resolution will be handled in ieee80211_xmit(), so 2512 * leave the original DA. This also works for mcast */ 2513 const u8 *mesh_da = skb->data; 2514 2515 if (mppath) 2516 mesh_da = mppath->mpp; 2517 else if (mpath) 2518 mesh_da = mpath->dst; 2519 2520 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2521 mesh_da, sdata->vif.addr); 2522 if (is_multicast_ether_addr(mesh_da)) 2523 /* DA TA mSA AE:SA */ 2524 meshhdrlen = ieee80211_new_mesh_header( 2525 sdata, &mesh_hdr, 2526 skb->data + ETH_ALEN, NULL); 2527 else 2528 /* RA TA mDA mSA AE:DA SA */ 2529 meshhdrlen = ieee80211_new_mesh_header( 2530 sdata, &mesh_hdr, skb->data, 2531 skb->data + ETH_ALEN); 2532 2533 } 2534 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2535 if (!chanctx_conf) { 2536 ret = -ENOTCONN; 2537 goto free; 2538 } 2539 band = chanctx_conf->def.chan->band; 2540 break; 2541 #endif 2542 case NL80211_IFTYPE_STATION: 2543 /* we already did checks when looking up the RA STA */ 2544 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2545 2546 if (tdls_peer) { 2547 /* DA SA BSSID */ 2548 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2549 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2550 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2551 hdrlen = 24; 2552 } else if (sdata->u.mgd.use_4addr && 2553 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2554 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2555 IEEE80211_FCTL_TODS); 2556 /* RA TA DA SA */ 2557 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2558 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2559 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2560 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2561 hdrlen = 30; 2562 } else { 2563 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2564 /* BSSID SA DA */ 2565 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2566 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2567 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2568 hdrlen = 24; 2569 } 2570 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2571 if (!chanctx_conf) { 2572 ret = -ENOTCONN; 2573 goto free; 2574 } 2575 band = chanctx_conf->def.chan->band; 2576 break; 2577 case NL80211_IFTYPE_OCB: 2578 /* DA SA BSSID */ 2579 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2580 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2581 eth_broadcast_addr(hdr.addr3); 2582 hdrlen = 24; 2583 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2584 if (!chanctx_conf) { 2585 ret = -ENOTCONN; 2586 goto free; 2587 } 2588 band = chanctx_conf->def.chan->band; 2589 break; 2590 case NL80211_IFTYPE_ADHOC: 2591 /* DA SA BSSID */ 2592 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2593 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2594 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2595 hdrlen = 24; 2596 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2597 if (!chanctx_conf) { 2598 ret = -ENOTCONN; 2599 goto free; 2600 } 2601 band = chanctx_conf->def.chan->band; 2602 break; 2603 default: 2604 ret = -EINVAL; 2605 goto free; 2606 } 2607 2608 multicast = is_multicast_ether_addr(hdr.addr1); 2609 2610 /* sta is always NULL for mesh */ 2611 if (sta) { 2612 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2613 wme_sta = sta->sta.wme; 2614 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2615 /* For mesh, the use of the QoS header is mandatory */ 2616 wme_sta = true; 2617 } 2618 2619 /* receiver does QoS (which also means we do) use it */ 2620 if (wme_sta) { 2621 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2622 hdrlen += 2; 2623 } 2624 2625 /* 2626 * Drop unicast frames to unauthorised stations unless they are 2627 * EAPOL frames from the local station. 2628 */ 2629 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2630 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2631 !multicast && !authorized && 2632 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2633 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2634 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2635 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2636 sdata->name, hdr.addr1); 2637 #endif 2638 2639 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2640 2641 ret = -EPERM; 2642 goto free; 2643 } 2644 2645 if (unlikely(!multicast && skb->sk && 2646 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2647 struct sk_buff *ack_skb = skb_clone_sk(skb); 2648 2649 if (ack_skb) { 2650 unsigned long flags; 2651 int id; 2652 2653 spin_lock_irqsave(&local->ack_status_lock, flags); 2654 id = idr_alloc(&local->ack_status_frames, ack_skb, 2655 1, 0x10000, GFP_ATOMIC); 2656 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2657 2658 if (id >= 0) { 2659 info_id = id; 2660 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2661 } else { 2662 kfree_skb(ack_skb); 2663 } 2664 } 2665 } 2666 2667 /* 2668 * If the skb is shared we need to obtain our own copy. 2669 */ 2670 if (skb_shared(skb)) { 2671 struct sk_buff *tmp_skb = skb; 2672 2673 /* can't happen -- skb is a clone if info_id != 0 */ 2674 WARN_ON(info_id); 2675 2676 skb = skb_clone(skb, GFP_ATOMIC); 2677 kfree_skb(tmp_skb); 2678 2679 if (!skb) { 2680 ret = -ENOMEM; 2681 goto free; 2682 } 2683 } 2684 2685 hdr.frame_control = fc; 2686 hdr.duration_id = 0; 2687 hdr.seq_ctrl = 0; 2688 2689 skip_header_bytes = ETH_HLEN; 2690 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2691 encaps_data = bridge_tunnel_header; 2692 encaps_len = sizeof(bridge_tunnel_header); 2693 skip_header_bytes -= 2; 2694 } else if (ethertype >= ETH_P_802_3_MIN) { 2695 encaps_data = rfc1042_header; 2696 encaps_len = sizeof(rfc1042_header); 2697 skip_header_bytes -= 2; 2698 } else { 2699 encaps_data = NULL; 2700 encaps_len = 0; 2701 } 2702 2703 skb_pull(skb, skip_header_bytes); 2704 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2705 2706 /* 2707 * So we need to modify the skb header and hence need a copy of 2708 * that. The head_need variable above doesn't, so far, include 2709 * the needed header space that we don't need right away. If we 2710 * can, then we don't reallocate right now but only after the 2711 * frame arrives at the master device (if it does...) 2712 * 2713 * If we cannot, however, then we will reallocate to include all 2714 * the ever needed space. Also, if we need to reallocate it anyway, 2715 * make it big enough for everything we may ever need. 2716 */ 2717 2718 if (head_need > 0 || skb_cloned(skb)) { 2719 head_need += sdata->encrypt_headroom; 2720 head_need += local->tx_headroom; 2721 head_need = max_t(int, 0, head_need); 2722 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2723 ieee80211_free_txskb(&local->hw, skb); 2724 skb = NULL; 2725 return ERR_PTR(-ENOMEM); 2726 } 2727 } 2728 2729 if (encaps_data) 2730 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2731 2732 #ifdef CONFIG_MAC80211_MESH 2733 if (meshhdrlen > 0) 2734 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2735 #endif 2736 2737 if (ieee80211_is_data_qos(fc)) { 2738 __le16 *qos_control; 2739 2740 qos_control = skb_push(skb, 2); 2741 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2742 /* 2743 * Maybe we could actually set some fields here, for now just 2744 * initialise to zero to indicate no special operation. 2745 */ 2746 *qos_control = 0; 2747 } else 2748 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2749 2750 skb_reset_mac_header(skb); 2751 2752 info = IEEE80211_SKB_CB(skb); 2753 memset(info, 0, sizeof(*info)); 2754 2755 info->flags = info_flags; 2756 info->ack_frame_id = info_id; 2757 info->band = band; 2758 2759 return skb; 2760 free: 2761 kfree_skb(skb); 2762 return ERR_PTR(ret); 2763 } 2764 2765 /* 2766 * fast-xmit overview 2767 * 2768 * The core idea of this fast-xmit is to remove per-packet checks by checking 2769 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2770 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2771 * much less work can be done per packet. For example, fragmentation must be 2772 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2773 * in the code here. 2774 * 2775 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2776 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2777 * 2778 * The most difficult part of this is that when any of these assumptions 2779 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2780 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2781 * since the per-packet code no longer checks the conditions. This is reflected 2782 * by the calls to these functions throughout the rest of the code, and must be 2783 * maintained if any of the TX path checks change. 2784 */ 2785 2786 void ieee80211_check_fast_xmit(struct sta_info *sta) 2787 { 2788 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2789 struct ieee80211_local *local = sta->local; 2790 struct ieee80211_sub_if_data *sdata = sta->sdata; 2791 struct ieee80211_hdr *hdr = (void *)build.hdr; 2792 struct ieee80211_chanctx_conf *chanctx_conf; 2793 __le16 fc; 2794 2795 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2796 return; 2797 2798 /* Locking here protects both the pointer itself, and against concurrent 2799 * invocations winning data access races to, e.g., the key pointer that 2800 * is used. 2801 * Without it, the invocation of this function right after the key 2802 * pointer changes wouldn't be sufficient, as another CPU could access 2803 * the pointer, then stall, and then do the cache update after the CPU 2804 * that invalidated the key. 2805 * With the locking, such scenarios cannot happen as the check for the 2806 * key and the fast-tx assignment are done atomically, so the CPU that 2807 * modifies the key will either wait or other one will see the key 2808 * cleared/changed already. 2809 */ 2810 spin_lock_bh(&sta->lock); 2811 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2812 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2813 sdata->vif.type == NL80211_IFTYPE_STATION) 2814 goto out; 2815 2816 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2817 goto out; 2818 2819 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2820 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2821 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2822 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2823 goto out; 2824 2825 if (sdata->noack_map) 2826 goto out; 2827 2828 /* fast-xmit doesn't handle fragmentation at all */ 2829 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2830 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2831 goto out; 2832 2833 rcu_read_lock(); 2834 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2835 if (!chanctx_conf) { 2836 rcu_read_unlock(); 2837 goto out; 2838 } 2839 build.band = chanctx_conf->def.chan->band; 2840 rcu_read_unlock(); 2841 2842 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2843 2844 switch (sdata->vif.type) { 2845 case NL80211_IFTYPE_ADHOC: 2846 /* DA SA BSSID */ 2847 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2848 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2849 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2850 build.hdr_len = 24; 2851 break; 2852 case NL80211_IFTYPE_STATION: 2853 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2854 /* DA SA BSSID */ 2855 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2856 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2857 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2858 build.hdr_len = 24; 2859 break; 2860 } 2861 2862 if (sdata->u.mgd.use_4addr) { 2863 /* non-regular ethertype cannot use the fastpath */ 2864 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2865 IEEE80211_FCTL_TODS); 2866 /* RA TA DA SA */ 2867 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2868 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2869 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2870 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2871 build.hdr_len = 30; 2872 break; 2873 } 2874 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2875 /* BSSID SA DA */ 2876 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2877 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2878 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2879 build.hdr_len = 24; 2880 break; 2881 case NL80211_IFTYPE_AP_VLAN: 2882 if (sdata->wdev.use_4addr) { 2883 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2884 IEEE80211_FCTL_TODS); 2885 /* RA TA DA SA */ 2886 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2887 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2888 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2889 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2890 build.hdr_len = 30; 2891 break; 2892 } 2893 /* fall through */ 2894 case NL80211_IFTYPE_AP: 2895 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2896 /* DA BSSID SA */ 2897 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2898 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2899 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2900 build.hdr_len = 24; 2901 break; 2902 default: 2903 /* not handled on fast-xmit */ 2904 goto out; 2905 } 2906 2907 if (sta->sta.wme) { 2908 build.hdr_len += 2; 2909 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2910 } 2911 2912 /* We store the key here so there's no point in using rcu_dereference() 2913 * but that's fine because the code that changes the pointers will call 2914 * this function after doing so. For a single CPU that would be enough, 2915 * for multiple see the comment above. 2916 */ 2917 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2918 if (!build.key) 2919 build.key = rcu_access_pointer(sdata->default_unicast_key); 2920 if (build.key) { 2921 bool gen_iv, iv_spc, mmic; 2922 2923 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2924 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2925 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2926 2927 /* don't handle software crypto */ 2928 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2929 goto out; 2930 2931 switch (build.key->conf.cipher) { 2932 case WLAN_CIPHER_SUITE_CCMP: 2933 case WLAN_CIPHER_SUITE_CCMP_256: 2934 /* add fixed key ID */ 2935 if (gen_iv) { 2936 (build.hdr + build.hdr_len)[3] = 2937 0x20 | (build.key->conf.keyidx << 6); 2938 build.pn_offs = build.hdr_len; 2939 } 2940 if (gen_iv || iv_spc) 2941 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2942 break; 2943 case WLAN_CIPHER_SUITE_GCMP: 2944 case WLAN_CIPHER_SUITE_GCMP_256: 2945 /* add fixed key ID */ 2946 if (gen_iv) { 2947 (build.hdr + build.hdr_len)[3] = 2948 0x20 | (build.key->conf.keyidx << 6); 2949 build.pn_offs = build.hdr_len; 2950 } 2951 if (gen_iv || iv_spc) 2952 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2953 break; 2954 case WLAN_CIPHER_SUITE_TKIP: 2955 /* cannot handle MMIC or IV generation in xmit-fast */ 2956 if (mmic || gen_iv) 2957 goto out; 2958 if (iv_spc) 2959 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2960 break; 2961 case WLAN_CIPHER_SUITE_WEP40: 2962 case WLAN_CIPHER_SUITE_WEP104: 2963 /* cannot handle IV generation in fast-xmit */ 2964 if (gen_iv) 2965 goto out; 2966 if (iv_spc) 2967 build.hdr_len += IEEE80211_WEP_IV_LEN; 2968 break; 2969 case WLAN_CIPHER_SUITE_AES_CMAC: 2970 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2971 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2972 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2973 WARN(1, 2974 "management cipher suite 0x%x enabled for data\n", 2975 build.key->conf.cipher); 2976 goto out; 2977 default: 2978 /* we don't know how to generate IVs for this at all */ 2979 if (WARN_ON(gen_iv)) 2980 goto out; 2981 /* pure hardware keys are OK, of course */ 2982 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2983 break; 2984 /* cipher scheme might require space allocation */ 2985 if (iv_spc && 2986 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2987 goto out; 2988 if (iv_spc) 2989 build.hdr_len += build.key->conf.iv_len; 2990 } 2991 2992 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2993 } 2994 2995 hdr->frame_control = fc; 2996 2997 memcpy(build.hdr + build.hdr_len, 2998 rfc1042_header, sizeof(rfc1042_header)); 2999 build.hdr_len += sizeof(rfc1042_header); 3000 3001 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3002 /* if the kmemdup fails, continue w/o fast_tx */ 3003 if (!fast_tx) 3004 goto out; 3005 3006 out: 3007 /* we might have raced against another call to this function */ 3008 old = rcu_dereference_protected(sta->fast_tx, 3009 lockdep_is_held(&sta->lock)); 3010 rcu_assign_pointer(sta->fast_tx, fast_tx); 3011 if (old) 3012 kfree_rcu(old, rcu_head); 3013 spin_unlock_bh(&sta->lock); 3014 } 3015 3016 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3017 { 3018 struct sta_info *sta; 3019 3020 rcu_read_lock(); 3021 list_for_each_entry_rcu(sta, &local->sta_list, list) 3022 ieee80211_check_fast_xmit(sta); 3023 rcu_read_unlock(); 3024 } 3025 3026 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3027 { 3028 struct ieee80211_local *local = sdata->local; 3029 struct sta_info *sta; 3030 3031 rcu_read_lock(); 3032 3033 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3034 if (sdata != sta->sdata && 3035 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3036 continue; 3037 ieee80211_check_fast_xmit(sta); 3038 } 3039 3040 rcu_read_unlock(); 3041 } 3042 3043 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3044 { 3045 struct ieee80211_fast_tx *fast_tx; 3046 3047 spin_lock_bh(&sta->lock); 3048 fast_tx = rcu_dereference_protected(sta->fast_tx, 3049 lockdep_is_held(&sta->lock)); 3050 RCU_INIT_POINTER(sta->fast_tx, NULL); 3051 spin_unlock_bh(&sta->lock); 3052 3053 if (fast_tx) 3054 kfree_rcu(fast_tx, rcu_head); 3055 } 3056 3057 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3058 struct sk_buff *skb, int headroom, 3059 int *subframe_len) 3060 { 3061 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3062 int padding = (4 - amsdu_len) & 3; 3063 3064 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3065 I802_DEBUG_INC(local->tx_expand_skb_head); 3066 3067 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3068 wiphy_debug(local->hw.wiphy, 3069 "failed to reallocate TX buffer\n"); 3070 return false; 3071 } 3072 } 3073 3074 if (padding) { 3075 *subframe_len += padding; 3076 skb_put_zero(skb, padding); 3077 } 3078 3079 return true; 3080 } 3081 3082 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3083 struct ieee80211_fast_tx *fast_tx, 3084 struct sk_buff *skb) 3085 { 3086 struct ieee80211_local *local = sdata->local; 3087 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3088 struct ieee80211_hdr *hdr; 3089 struct ethhdr *amsdu_hdr; 3090 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3091 int subframe_len = skb->len - hdr_len; 3092 void *data; 3093 u8 *qc, *h_80211_src, *h_80211_dst; 3094 const u8 *bssid; 3095 3096 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3097 return false; 3098 3099 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3100 return true; 3101 3102 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3103 &subframe_len)) 3104 return false; 3105 3106 data = skb_push(skb, sizeof(*amsdu_hdr)); 3107 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3108 hdr = data; 3109 amsdu_hdr = data + hdr_len; 3110 /* h_80211_src/dst is addr* field within hdr */ 3111 h_80211_src = data + fast_tx->sa_offs; 3112 h_80211_dst = data + fast_tx->da_offs; 3113 3114 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3115 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3116 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3117 3118 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3119 * fields needs to be changed to BSSID for A-MSDU frames depending 3120 * on FromDS/ToDS values. 3121 */ 3122 switch (sdata->vif.type) { 3123 case NL80211_IFTYPE_STATION: 3124 bssid = sdata->u.mgd.bssid; 3125 break; 3126 case NL80211_IFTYPE_AP: 3127 case NL80211_IFTYPE_AP_VLAN: 3128 bssid = sdata->vif.addr; 3129 break; 3130 default: 3131 bssid = NULL; 3132 } 3133 3134 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3135 ether_addr_copy(h_80211_src, bssid); 3136 3137 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3138 ether_addr_copy(h_80211_dst, bssid); 3139 3140 qc = ieee80211_get_qos_ctl(hdr); 3141 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3142 3143 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3144 3145 return true; 3146 } 3147 3148 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3149 struct sta_info *sta, 3150 struct ieee80211_fast_tx *fast_tx, 3151 struct sk_buff *skb) 3152 { 3153 struct ieee80211_local *local = sdata->local; 3154 struct fq *fq = &local->fq; 3155 struct fq_tin *tin; 3156 struct fq_flow *flow; 3157 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3158 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3159 struct txq_info *txqi; 3160 struct sk_buff **frag_tail, *head; 3161 int subframe_len = skb->len - ETH_ALEN; 3162 u8 max_subframes = sta->sta.max_amsdu_subframes; 3163 int max_frags = local->hw.max_tx_fragments; 3164 int max_amsdu_len = sta->sta.max_amsdu_len; 3165 __be16 len; 3166 void *data; 3167 bool ret = false; 3168 unsigned int orig_len; 3169 int n = 1, nfrags; 3170 3171 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3172 return false; 3173 3174 if (!txq) 3175 return false; 3176 3177 txqi = to_txq_info(txq); 3178 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3179 return false; 3180 3181 if (sta->sta.max_rc_amsdu_len) 3182 max_amsdu_len = min_t(int, max_amsdu_len, 3183 sta->sta.max_rc_amsdu_len); 3184 3185 spin_lock_bh(&fq->lock); 3186 3187 /* TODO: Ideally aggregation should be done on dequeue to remain 3188 * responsive to environment changes. 3189 */ 3190 3191 tin = &txqi->tin; 3192 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3193 head = skb_peek_tail(&flow->queue); 3194 if (!head) 3195 goto out; 3196 3197 orig_len = head->len; 3198 3199 if (skb->len + head->len > max_amsdu_len) 3200 goto out; 3201 3202 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3203 goto out; 3204 3205 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3206 nfrags += 1 + skb_shinfo(head)->nr_frags; 3207 frag_tail = &skb_shinfo(head)->frag_list; 3208 while (*frag_tail) { 3209 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3210 frag_tail = &(*frag_tail)->next; 3211 n++; 3212 } 3213 3214 if (max_subframes && n > max_subframes) 3215 goto out; 3216 3217 if (max_frags && nfrags > max_frags) 3218 goto out; 3219 3220 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3221 &subframe_len)) 3222 goto out; 3223 3224 ret = true; 3225 data = skb_push(skb, ETH_ALEN + 2); 3226 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3227 3228 data += 2 * ETH_ALEN; 3229 len = cpu_to_be16(subframe_len); 3230 memcpy(data, &len, 2); 3231 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3232 3233 head->len += skb->len; 3234 head->data_len += skb->len; 3235 *frag_tail = skb; 3236 3237 flow->backlog += head->len - orig_len; 3238 tin->backlog_bytes += head->len - orig_len; 3239 3240 fq_recalc_backlog(fq, tin, flow); 3241 3242 out: 3243 spin_unlock_bh(&fq->lock); 3244 3245 return ret; 3246 } 3247 3248 /* 3249 * Can be called while the sta lock is held. Anything that can cause packets to 3250 * be generated will cause deadlock! 3251 */ 3252 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3253 struct sta_info *sta, u8 pn_offs, 3254 struct ieee80211_key *key, 3255 struct sk_buff *skb) 3256 { 3257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3258 struct ieee80211_hdr *hdr = (void *)skb->data; 3259 u8 tid = IEEE80211_NUM_TIDS; 3260 3261 if (key) 3262 info->control.hw_key = &key->conf; 3263 3264 ieee80211_tx_stats(skb->dev, skb->len); 3265 3266 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3267 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3268 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3269 } else { 3270 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3271 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3272 sdata->sequence_number += 0x10; 3273 } 3274 3275 if (skb_shinfo(skb)->gso_size) 3276 sta->tx_stats.msdu[tid] += 3277 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3278 else 3279 sta->tx_stats.msdu[tid]++; 3280 3281 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3282 3283 /* statistics normally done by ieee80211_tx_h_stats (but that 3284 * has to consider fragmentation, so is more complex) 3285 */ 3286 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3287 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3288 3289 if (pn_offs) { 3290 u64 pn; 3291 u8 *crypto_hdr = skb->data + pn_offs; 3292 3293 switch (key->conf.cipher) { 3294 case WLAN_CIPHER_SUITE_CCMP: 3295 case WLAN_CIPHER_SUITE_CCMP_256: 3296 case WLAN_CIPHER_SUITE_GCMP: 3297 case WLAN_CIPHER_SUITE_GCMP_256: 3298 pn = atomic64_inc_return(&key->conf.tx_pn); 3299 crypto_hdr[0] = pn; 3300 crypto_hdr[1] = pn >> 8; 3301 crypto_hdr[4] = pn >> 16; 3302 crypto_hdr[5] = pn >> 24; 3303 crypto_hdr[6] = pn >> 32; 3304 crypto_hdr[7] = pn >> 40; 3305 break; 3306 } 3307 } 3308 } 3309 3310 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3311 struct sta_info *sta, 3312 struct ieee80211_fast_tx *fast_tx, 3313 struct sk_buff *skb) 3314 { 3315 struct ieee80211_local *local = sdata->local; 3316 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3317 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3318 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3319 struct ethhdr eth; 3320 struct ieee80211_tx_info *info; 3321 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3322 struct ieee80211_tx_data tx; 3323 ieee80211_tx_result r; 3324 struct tid_ampdu_tx *tid_tx = NULL; 3325 u8 tid = IEEE80211_NUM_TIDS; 3326 3327 /* control port protocol needs a lot of special handling */ 3328 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3329 return false; 3330 3331 /* only RFC 1042 SNAP */ 3332 if (ethertype < ETH_P_802_3_MIN) 3333 return false; 3334 3335 /* don't handle TX status request here either */ 3336 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3337 return false; 3338 3339 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3340 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3341 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3342 if (tid_tx) { 3343 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3344 return false; 3345 if (tid_tx->timeout) 3346 tid_tx->last_tx = jiffies; 3347 } 3348 } 3349 3350 /* after this point (skb is modified) we cannot return false */ 3351 3352 if (skb_shared(skb)) { 3353 struct sk_buff *tmp_skb = skb; 3354 3355 skb = skb_clone(skb, GFP_ATOMIC); 3356 kfree_skb(tmp_skb); 3357 3358 if (!skb) 3359 return true; 3360 } 3361 3362 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3363 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3364 return true; 3365 3366 /* will not be crypto-handled beyond what we do here, so use false 3367 * as the may-encrypt argument for the resize to not account for 3368 * more room than we already have in 'extra_head' 3369 */ 3370 if (unlikely(ieee80211_skb_resize(sdata, skb, 3371 max_t(int, extra_head + hw_headroom - 3372 skb_headroom(skb), 0), 3373 false))) { 3374 kfree_skb(skb); 3375 return true; 3376 } 3377 3378 memcpy(ð, skb->data, ETH_HLEN - 2); 3379 hdr = skb_push(skb, extra_head); 3380 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3381 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3382 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3383 3384 info = IEEE80211_SKB_CB(skb); 3385 memset(info, 0, sizeof(*info)); 3386 info->band = fast_tx->band; 3387 info->control.vif = &sdata->vif; 3388 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3389 IEEE80211_TX_CTL_DONTFRAG | 3390 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3391 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3392 3393 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3394 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3395 *ieee80211_get_qos_ctl(hdr) = tid; 3396 } 3397 3398 __skb_queue_head_init(&tx.skbs); 3399 3400 tx.flags = IEEE80211_TX_UNICAST; 3401 tx.local = local; 3402 tx.sdata = sdata; 3403 tx.sta = sta; 3404 tx.key = fast_tx->key; 3405 3406 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3407 tx.skb = skb; 3408 r = ieee80211_tx_h_rate_ctrl(&tx); 3409 skb = tx.skb; 3410 tx.skb = NULL; 3411 3412 if (r != TX_CONTINUE) { 3413 if (r != TX_QUEUED) 3414 kfree_skb(skb); 3415 return true; 3416 } 3417 } 3418 3419 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3420 return true; 3421 3422 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3423 fast_tx->key, skb); 3424 3425 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3426 sdata = container_of(sdata->bss, 3427 struct ieee80211_sub_if_data, u.ap); 3428 3429 __skb_queue_tail(&tx.skbs, skb); 3430 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3431 return true; 3432 } 3433 3434 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3435 struct ieee80211_txq *txq) 3436 { 3437 struct ieee80211_local *local = hw_to_local(hw); 3438 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3439 struct ieee80211_hdr *hdr; 3440 struct sk_buff *skb = NULL; 3441 struct fq *fq = &local->fq; 3442 struct fq_tin *tin = &txqi->tin; 3443 struct ieee80211_tx_info *info; 3444 struct ieee80211_tx_data tx; 3445 ieee80211_tx_result r; 3446 struct ieee80211_vif *vif; 3447 3448 spin_lock_bh(&fq->lock); 3449 3450 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3451 goto out; 3452 3453 /* Make sure fragments stay together. */ 3454 skb = __skb_dequeue(&txqi->frags); 3455 if (skb) 3456 goto out; 3457 3458 begin: 3459 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3460 if (!skb) 3461 goto out; 3462 3463 hdr = (struct ieee80211_hdr *)skb->data; 3464 info = IEEE80211_SKB_CB(skb); 3465 3466 memset(&tx, 0, sizeof(tx)); 3467 __skb_queue_head_init(&tx.skbs); 3468 tx.local = local; 3469 tx.skb = skb; 3470 tx.sdata = vif_to_sdata(info->control.vif); 3471 3472 if (txq->sta) 3473 tx.sta = container_of(txq->sta, struct sta_info, sta); 3474 3475 /* 3476 * The key can be removed while the packet was queued, so need to call 3477 * this here to get the current key. 3478 */ 3479 r = ieee80211_tx_h_select_key(&tx); 3480 if (r != TX_CONTINUE) { 3481 ieee80211_free_txskb(&local->hw, skb); 3482 goto begin; 3483 } 3484 3485 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3486 info->flags |= IEEE80211_TX_CTL_AMPDU; 3487 else 3488 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3489 3490 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3491 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3492 sta); 3493 u8 pn_offs = 0; 3494 3495 if (tx.key && 3496 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3497 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3498 3499 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3500 tx.key, skb); 3501 } else { 3502 if (invoke_tx_handlers_late(&tx)) 3503 goto begin; 3504 3505 skb = __skb_dequeue(&tx.skbs); 3506 3507 if (!skb_queue_empty(&tx.skbs)) 3508 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3509 } 3510 3511 if (skb && skb_has_frag_list(skb) && 3512 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3513 if (skb_linearize(skb)) { 3514 ieee80211_free_txskb(&local->hw, skb); 3515 goto begin; 3516 } 3517 } 3518 3519 switch (tx.sdata->vif.type) { 3520 case NL80211_IFTYPE_MONITOR: 3521 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3522 vif = &tx.sdata->vif; 3523 break; 3524 } 3525 tx.sdata = rcu_dereference(local->monitor_sdata); 3526 if (tx.sdata) { 3527 vif = &tx.sdata->vif; 3528 info->hw_queue = 3529 vif->hw_queue[skb_get_queue_mapping(skb)]; 3530 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3531 ieee80211_free_txskb(&local->hw, skb); 3532 goto begin; 3533 } else { 3534 vif = NULL; 3535 } 3536 break; 3537 case NL80211_IFTYPE_AP_VLAN: 3538 tx.sdata = container_of(tx.sdata->bss, 3539 struct ieee80211_sub_if_data, u.ap); 3540 /* fall through */ 3541 default: 3542 vif = &tx.sdata->vif; 3543 break; 3544 } 3545 3546 IEEE80211_SKB_CB(skb)->control.vif = vif; 3547 out: 3548 spin_unlock_bh(&fq->lock); 3549 3550 return skb; 3551 } 3552 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3553 3554 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3555 struct net_device *dev, 3556 u32 info_flags) 3557 { 3558 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3559 struct sta_info *sta; 3560 struct sk_buff *next; 3561 3562 if (unlikely(skb->len < ETH_HLEN)) { 3563 kfree_skb(skb); 3564 return; 3565 } 3566 3567 rcu_read_lock(); 3568 3569 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3570 goto out_free; 3571 3572 if (!IS_ERR_OR_NULL(sta)) { 3573 struct ieee80211_fast_tx *fast_tx; 3574 3575 fast_tx = rcu_dereference(sta->fast_tx); 3576 3577 if (fast_tx && 3578 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3579 goto out; 3580 } 3581 3582 if (skb_is_gso(skb)) { 3583 struct sk_buff *segs; 3584 3585 segs = skb_gso_segment(skb, 0); 3586 if (IS_ERR(segs)) { 3587 goto out_free; 3588 } else if (segs) { 3589 consume_skb(skb); 3590 skb = segs; 3591 } 3592 } else { 3593 /* we cannot process non-linear frames on this path */ 3594 if (skb_linearize(skb)) { 3595 kfree_skb(skb); 3596 goto out; 3597 } 3598 3599 /* the frame could be fragmented, software-encrypted, and other 3600 * things so we cannot really handle checksum offload with it - 3601 * fix it up in software before we handle anything else. 3602 */ 3603 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3604 skb_set_transport_header(skb, 3605 skb_checksum_start_offset(skb)); 3606 if (skb_checksum_help(skb)) 3607 goto out_free; 3608 } 3609 } 3610 3611 next = skb; 3612 while (next) { 3613 skb = next; 3614 next = skb->next; 3615 3616 skb->prev = NULL; 3617 skb->next = NULL; 3618 3619 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3620 if (IS_ERR(skb)) 3621 goto out; 3622 3623 ieee80211_tx_stats(dev, skb->len); 3624 3625 ieee80211_xmit(sdata, sta, skb); 3626 } 3627 goto out; 3628 out_free: 3629 kfree_skb(skb); 3630 out: 3631 rcu_read_unlock(); 3632 } 3633 3634 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3635 { 3636 struct ethhdr *eth; 3637 int err; 3638 3639 err = skb_ensure_writable(skb, ETH_HLEN); 3640 if (unlikely(err)) 3641 return err; 3642 3643 eth = (void *)skb->data; 3644 ether_addr_copy(eth->h_dest, sta->sta.addr); 3645 3646 return 0; 3647 } 3648 3649 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3650 struct net_device *dev) 3651 { 3652 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3653 const struct ethhdr *eth = (void *)skb->data; 3654 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3655 __be16 ethertype; 3656 3657 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3658 return false; 3659 3660 switch (sdata->vif.type) { 3661 case NL80211_IFTYPE_AP_VLAN: 3662 if (sdata->u.vlan.sta) 3663 return false; 3664 if (sdata->wdev.use_4addr) 3665 return false; 3666 /* fall through */ 3667 case NL80211_IFTYPE_AP: 3668 /* check runtime toggle for this bss */ 3669 if (!sdata->bss->multicast_to_unicast) 3670 return false; 3671 break; 3672 default: 3673 return false; 3674 } 3675 3676 /* multicast to unicast conversion only for some payload */ 3677 ethertype = eth->h_proto; 3678 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3679 ethertype = ethvlan->h_vlan_encapsulated_proto; 3680 switch (ethertype) { 3681 case htons(ETH_P_ARP): 3682 case htons(ETH_P_IP): 3683 case htons(ETH_P_IPV6): 3684 break; 3685 default: 3686 return false; 3687 } 3688 3689 return true; 3690 } 3691 3692 static void 3693 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3694 struct sk_buff_head *queue) 3695 { 3696 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3697 struct ieee80211_local *local = sdata->local; 3698 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3699 struct sta_info *sta, *first = NULL; 3700 struct sk_buff *cloned_skb; 3701 3702 rcu_read_lock(); 3703 3704 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3705 if (sdata != sta->sdata) 3706 /* AP-VLAN mismatch */ 3707 continue; 3708 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3709 /* do not send back to source */ 3710 continue; 3711 if (!first) { 3712 first = sta; 3713 continue; 3714 } 3715 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3716 if (!cloned_skb) 3717 goto multicast; 3718 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3719 dev_kfree_skb(cloned_skb); 3720 goto multicast; 3721 } 3722 __skb_queue_tail(queue, cloned_skb); 3723 } 3724 3725 if (likely(first)) { 3726 if (unlikely(ieee80211_change_da(skb, first))) 3727 goto multicast; 3728 __skb_queue_tail(queue, skb); 3729 } else { 3730 /* no STA connected, drop */ 3731 kfree_skb(skb); 3732 skb = NULL; 3733 } 3734 3735 goto out; 3736 multicast: 3737 __skb_queue_purge(queue); 3738 __skb_queue_tail(queue, skb); 3739 out: 3740 rcu_read_unlock(); 3741 } 3742 3743 /** 3744 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3745 * @skb: packet to be sent 3746 * @dev: incoming interface 3747 * 3748 * On failure skb will be freed. 3749 */ 3750 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3751 struct net_device *dev) 3752 { 3753 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3754 struct sk_buff_head queue; 3755 3756 __skb_queue_head_init(&queue); 3757 ieee80211_convert_to_unicast(skb, dev, &queue); 3758 while ((skb = __skb_dequeue(&queue))) 3759 __ieee80211_subif_start_xmit(skb, dev, 0); 3760 } else { 3761 __ieee80211_subif_start_xmit(skb, dev, 0); 3762 } 3763 3764 return NETDEV_TX_OK; 3765 } 3766 3767 struct sk_buff * 3768 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3769 struct sk_buff *skb, u32 info_flags) 3770 { 3771 struct ieee80211_hdr *hdr; 3772 struct ieee80211_tx_data tx = { 3773 .local = sdata->local, 3774 .sdata = sdata, 3775 }; 3776 struct sta_info *sta; 3777 3778 rcu_read_lock(); 3779 3780 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3781 kfree_skb(skb); 3782 skb = ERR_PTR(-EINVAL); 3783 goto out; 3784 } 3785 3786 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3787 if (IS_ERR(skb)) 3788 goto out; 3789 3790 hdr = (void *)skb->data; 3791 tx.sta = sta_info_get(sdata, hdr->addr1); 3792 tx.skb = skb; 3793 3794 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3795 rcu_read_unlock(); 3796 kfree_skb(skb); 3797 return ERR_PTR(-EINVAL); 3798 } 3799 3800 out: 3801 rcu_read_unlock(); 3802 return skb; 3803 } 3804 3805 /* 3806 * ieee80211_clear_tx_pending may not be called in a context where 3807 * it is possible that it packets could come in again. 3808 */ 3809 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3810 { 3811 struct sk_buff *skb; 3812 int i; 3813 3814 for (i = 0; i < local->hw.queues; i++) { 3815 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3816 ieee80211_free_txskb(&local->hw, skb); 3817 } 3818 } 3819 3820 /* 3821 * Returns false if the frame couldn't be transmitted but was queued instead, 3822 * which in this case means re-queued -- take as an indication to stop sending 3823 * more pending frames. 3824 */ 3825 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3826 struct sk_buff *skb) 3827 { 3828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3829 struct ieee80211_sub_if_data *sdata; 3830 struct sta_info *sta; 3831 struct ieee80211_hdr *hdr; 3832 bool result; 3833 struct ieee80211_chanctx_conf *chanctx_conf; 3834 3835 sdata = vif_to_sdata(info->control.vif); 3836 3837 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3838 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3839 if (unlikely(!chanctx_conf)) { 3840 dev_kfree_skb(skb); 3841 return true; 3842 } 3843 info->band = chanctx_conf->def.chan->band; 3844 result = ieee80211_tx(sdata, NULL, skb, true); 3845 } else { 3846 struct sk_buff_head skbs; 3847 3848 __skb_queue_head_init(&skbs); 3849 __skb_queue_tail(&skbs, skb); 3850 3851 hdr = (struct ieee80211_hdr *)skb->data; 3852 sta = sta_info_get(sdata, hdr->addr1); 3853 3854 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3855 } 3856 3857 return result; 3858 } 3859 3860 /* 3861 * Transmit all pending packets. Called from tasklet. 3862 */ 3863 void ieee80211_tx_pending(unsigned long data) 3864 { 3865 struct ieee80211_local *local = (struct ieee80211_local *)data; 3866 unsigned long flags; 3867 int i; 3868 bool txok; 3869 3870 rcu_read_lock(); 3871 3872 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3873 for (i = 0; i < local->hw.queues; i++) { 3874 /* 3875 * If queue is stopped by something other than due to pending 3876 * frames, or we have no pending frames, proceed to next queue. 3877 */ 3878 if (local->queue_stop_reasons[i] || 3879 skb_queue_empty(&local->pending[i])) 3880 continue; 3881 3882 while (!skb_queue_empty(&local->pending[i])) { 3883 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3884 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3885 3886 if (WARN_ON(!info->control.vif)) { 3887 ieee80211_free_txskb(&local->hw, skb); 3888 continue; 3889 } 3890 3891 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3892 flags); 3893 3894 txok = ieee80211_tx_pending_skb(local, skb); 3895 spin_lock_irqsave(&local->queue_stop_reason_lock, 3896 flags); 3897 if (!txok) 3898 break; 3899 } 3900 3901 if (skb_queue_empty(&local->pending[i])) 3902 ieee80211_propagate_queue_wake(local, i); 3903 } 3904 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3905 3906 rcu_read_unlock(); 3907 } 3908 3909 /* functions for drivers to get certain frames */ 3910 3911 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3912 struct ps_data *ps, struct sk_buff *skb, 3913 bool is_template) 3914 { 3915 u8 *pos, *tim; 3916 int aid0 = 0; 3917 int i, have_bits = 0, n1, n2; 3918 3919 /* Generate bitmap for TIM only if there are any STAs in power save 3920 * mode. */ 3921 if (atomic_read(&ps->num_sta_ps) > 0) 3922 /* in the hope that this is faster than 3923 * checking byte-for-byte */ 3924 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3925 IEEE80211_MAX_AID+1); 3926 if (!is_template) { 3927 if (ps->dtim_count == 0) 3928 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3929 else 3930 ps->dtim_count--; 3931 } 3932 3933 tim = pos = skb_put(skb, 6); 3934 *pos++ = WLAN_EID_TIM; 3935 *pos++ = 4; 3936 *pos++ = ps->dtim_count; 3937 *pos++ = sdata->vif.bss_conf.dtim_period; 3938 3939 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3940 aid0 = 1; 3941 3942 ps->dtim_bc_mc = aid0 == 1; 3943 3944 if (have_bits) { 3945 /* Find largest even number N1 so that bits numbered 1 through 3946 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3947 * (N2 + 1) x 8 through 2007 are 0. */ 3948 n1 = 0; 3949 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3950 if (ps->tim[i]) { 3951 n1 = i & 0xfe; 3952 break; 3953 } 3954 } 3955 n2 = n1; 3956 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3957 if (ps->tim[i]) { 3958 n2 = i; 3959 break; 3960 } 3961 } 3962 3963 /* Bitmap control */ 3964 *pos++ = n1 | aid0; 3965 /* Part Virt Bitmap */ 3966 skb_put(skb, n2 - n1); 3967 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3968 3969 tim[1] = n2 - n1 + 4; 3970 } else { 3971 *pos++ = aid0; /* Bitmap control */ 3972 *pos++ = 0; /* Part Virt Bitmap */ 3973 } 3974 } 3975 3976 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3977 struct ps_data *ps, struct sk_buff *skb, 3978 bool is_template) 3979 { 3980 struct ieee80211_local *local = sdata->local; 3981 3982 /* 3983 * Not very nice, but we want to allow the driver to call 3984 * ieee80211_beacon_get() as a response to the set_tim() 3985 * callback. That, however, is already invoked under the 3986 * sta_lock to guarantee consistent and race-free update 3987 * of the tim bitmap in mac80211 and the driver. 3988 */ 3989 if (local->tim_in_locked_section) { 3990 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3991 } else { 3992 spin_lock_bh(&local->tim_lock); 3993 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3994 spin_unlock_bh(&local->tim_lock); 3995 } 3996 3997 return 0; 3998 } 3999 4000 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4001 struct beacon_data *beacon) 4002 { 4003 struct probe_resp *resp; 4004 u8 *beacon_data; 4005 size_t beacon_data_len; 4006 int i; 4007 u8 count = beacon->csa_current_counter; 4008 4009 switch (sdata->vif.type) { 4010 case NL80211_IFTYPE_AP: 4011 beacon_data = beacon->tail; 4012 beacon_data_len = beacon->tail_len; 4013 break; 4014 case NL80211_IFTYPE_ADHOC: 4015 beacon_data = beacon->head; 4016 beacon_data_len = beacon->head_len; 4017 break; 4018 case NL80211_IFTYPE_MESH_POINT: 4019 beacon_data = beacon->head; 4020 beacon_data_len = beacon->head_len; 4021 break; 4022 default: 4023 return; 4024 } 4025 4026 rcu_read_lock(); 4027 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4028 resp = rcu_dereference(sdata->u.ap.probe_resp); 4029 4030 if (beacon->csa_counter_offsets[i]) { 4031 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4032 beacon_data_len)) { 4033 rcu_read_unlock(); 4034 return; 4035 } 4036 4037 beacon_data[beacon->csa_counter_offsets[i]] = count; 4038 } 4039 4040 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4041 resp->data[resp->csa_counter_offsets[i]] = count; 4042 } 4043 rcu_read_unlock(); 4044 } 4045 4046 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4047 { 4048 beacon->csa_current_counter--; 4049 4050 /* the counter should never reach 0 */ 4051 WARN_ON_ONCE(!beacon->csa_current_counter); 4052 4053 return beacon->csa_current_counter; 4054 } 4055 4056 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4057 { 4058 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4059 struct beacon_data *beacon = NULL; 4060 u8 count = 0; 4061 4062 rcu_read_lock(); 4063 4064 if (sdata->vif.type == NL80211_IFTYPE_AP) 4065 beacon = rcu_dereference(sdata->u.ap.beacon); 4066 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4067 beacon = rcu_dereference(sdata->u.ibss.presp); 4068 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4069 beacon = rcu_dereference(sdata->u.mesh.beacon); 4070 4071 if (!beacon) 4072 goto unlock; 4073 4074 count = __ieee80211_csa_update_counter(beacon); 4075 4076 unlock: 4077 rcu_read_unlock(); 4078 return count; 4079 } 4080 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4081 4082 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4083 { 4084 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4085 struct beacon_data *beacon = NULL; 4086 u8 *beacon_data; 4087 size_t beacon_data_len; 4088 int ret = false; 4089 4090 if (!ieee80211_sdata_running(sdata)) 4091 return false; 4092 4093 rcu_read_lock(); 4094 if (vif->type == NL80211_IFTYPE_AP) { 4095 struct ieee80211_if_ap *ap = &sdata->u.ap; 4096 4097 beacon = rcu_dereference(ap->beacon); 4098 if (WARN_ON(!beacon || !beacon->tail)) 4099 goto out; 4100 beacon_data = beacon->tail; 4101 beacon_data_len = beacon->tail_len; 4102 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4103 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4104 4105 beacon = rcu_dereference(ifibss->presp); 4106 if (!beacon) 4107 goto out; 4108 4109 beacon_data = beacon->head; 4110 beacon_data_len = beacon->head_len; 4111 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4112 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4113 4114 beacon = rcu_dereference(ifmsh->beacon); 4115 if (!beacon) 4116 goto out; 4117 4118 beacon_data = beacon->head; 4119 beacon_data_len = beacon->head_len; 4120 } else { 4121 WARN_ON(1); 4122 goto out; 4123 } 4124 4125 if (!beacon->csa_counter_offsets[0]) 4126 goto out; 4127 4128 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4129 goto out; 4130 4131 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4132 ret = true; 4133 out: 4134 rcu_read_unlock(); 4135 4136 return ret; 4137 } 4138 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4139 4140 static struct sk_buff * 4141 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4142 struct ieee80211_vif *vif, 4143 struct ieee80211_mutable_offsets *offs, 4144 bool is_template) 4145 { 4146 struct ieee80211_local *local = hw_to_local(hw); 4147 struct beacon_data *beacon = NULL; 4148 struct sk_buff *skb = NULL; 4149 struct ieee80211_tx_info *info; 4150 struct ieee80211_sub_if_data *sdata = NULL; 4151 enum nl80211_band band; 4152 struct ieee80211_tx_rate_control txrc; 4153 struct ieee80211_chanctx_conf *chanctx_conf; 4154 int csa_off_base = 0; 4155 4156 rcu_read_lock(); 4157 4158 sdata = vif_to_sdata(vif); 4159 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4160 4161 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4162 goto out; 4163 4164 if (offs) 4165 memset(offs, 0, sizeof(*offs)); 4166 4167 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4168 struct ieee80211_if_ap *ap = &sdata->u.ap; 4169 4170 beacon = rcu_dereference(ap->beacon); 4171 if (beacon) { 4172 if (beacon->csa_counter_offsets[0]) { 4173 if (!is_template) 4174 __ieee80211_csa_update_counter(beacon); 4175 4176 ieee80211_set_csa(sdata, beacon); 4177 } 4178 4179 /* 4180 * headroom, head length, 4181 * tail length and maximum TIM length 4182 */ 4183 skb = dev_alloc_skb(local->tx_headroom + 4184 beacon->head_len + 4185 beacon->tail_len + 256 + 4186 local->hw.extra_beacon_tailroom); 4187 if (!skb) 4188 goto out; 4189 4190 skb_reserve(skb, local->tx_headroom); 4191 skb_put_data(skb, beacon->head, beacon->head_len); 4192 4193 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4194 is_template); 4195 4196 if (offs) { 4197 offs->tim_offset = beacon->head_len; 4198 offs->tim_length = skb->len - beacon->head_len; 4199 4200 /* for AP the csa offsets are from tail */ 4201 csa_off_base = skb->len; 4202 } 4203 4204 if (beacon->tail) 4205 skb_put_data(skb, beacon->tail, 4206 beacon->tail_len); 4207 } else 4208 goto out; 4209 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4210 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4211 struct ieee80211_hdr *hdr; 4212 4213 beacon = rcu_dereference(ifibss->presp); 4214 if (!beacon) 4215 goto out; 4216 4217 if (beacon->csa_counter_offsets[0]) { 4218 if (!is_template) 4219 __ieee80211_csa_update_counter(beacon); 4220 4221 ieee80211_set_csa(sdata, beacon); 4222 } 4223 4224 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4225 local->hw.extra_beacon_tailroom); 4226 if (!skb) 4227 goto out; 4228 skb_reserve(skb, local->tx_headroom); 4229 skb_put_data(skb, beacon->head, beacon->head_len); 4230 4231 hdr = (struct ieee80211_hdr *) skb->data; 4232 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4233 IEEE80211_STYPE_BEACON); 4234 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4235 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4236 4237 beacon = rcu_dereference(ifmsh->beacon); 4238 if (!beacon) 4239 goto out; 4240 4241 if (beacon->csa_counter_offsets[0]) { 4242 if (!is_template) 4243 /* TODO: For mesh csa_counter is in TU, so 4244 * decrementing it by one isn't correct, but 4245 * for now we leave it consistent with overall 4246 * mac80211's behavior. 4247 */ 4248 __ieee80211_csa_update_counter(beacon); 4249 4250 ieee80211_set_csa(sdata, beacon); 4251 } 4252 4253 if (ifmsh->sync_ops) 4254 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4255 4256 skb = dev_alloc_skb(local->tx_headroom + 4257 beacon->head_len + 4258 256 + /* TIM IE */ 4259 beacon->tail_len + 4260 local->hw.extra_beacon_tailroom); 4261 if (!skb) 4262 goto out; 4263 skb_reserve(skb, local->tx_headroom); 4264 skb_put_data(skb, beacon->head, beacon->head_len); 4265 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4266 4267 if (offs) { 4268 offs->tim_offset = beacon->head_len; 4269 offs->tim_length = skb->len - beacon->head_len; 4270 } 4271 4272 skb_put_data(skb, beacon->tail, beacon->tail_len); 4273 } else { 4274 WARN_ON(1); 4275 goto out; 4276 } 4277 4278 /* CSA offsets */ 4279 if (offs && beacon) { 4280 int i; 4281 4282 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4283 u16 csa_off = beacon->csa_counter_offsets[i]; 4284 4285 if (!csa_off) 4286 continue; 4287 4288 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4289 } 4290 } 4291 4292 band = chanctx_conf->def.chan->band; 4293 4294 info = IEEE80211_SKB_CB(skb); 4295 4296 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4297 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4298 info->band = band; 4299 4300 memset(&txrc, 0, sizeof(txrc)); 4301 txrc.hw = hw; 4302 txrc.sband = local->hw.wiphy->bands[band]; 4303 txrc.bss_conf = &sdata->vif.bss_conf; 4304 txrc.skb = skb; 4305 txrc.reported_rate.idx = -1; 4306 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4307 txrc.bss = true; 4308 rate_control_get_rate(sdata, NULL, &txrc); 4309 4310 info->control.vif = vif; 4311 4312 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4313 IEEE80211_TX_CTL_ASSIGN_SEQ | 4314 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4315 out: 4316 rcu_read_unlock(); 4317 return skb; 4318 4319 } 4320 4321 struct sk_buff * 4322 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4323 struct ieee80211_vif *vif, 4324 struct ieee80211_mutable_offsets *offs) 4325 { 4326 return __ieee80211_beacon_get(hw, vif, offs, true); 4327 } 4328 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4329 4330 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4331 struct ieee80211_vif *vif, 4332 u16 *tim_offset, u16 *tim_length) 4333 { 4334 struct ieee80211_mutable_offsets offs = {}; 4335 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4336 struct sk_buff *copy; 4337 struct ieee80211_supported_band *sband; 4338 int shift; 4339 4340 if (!bcn) 4341 return bcn; 4342 4343 if (tim_offset) 4344 *tim_offset = offs.tim_offset; 4345 4346 if (tim_length) 4347 *tim_length = offs.tim_length; 4348 4349 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4350 !hw_to_local(hw)->monitors) 4351 return bcn; 4352 4353 /* send a copy to monitor interfaces */ 4354 copy = skb_copy(bcn, GFP_ATOMIC); 4355 if (!copy) 4356 return bcn; 4357 4358 shift = ieee80211_vif_get_shift(vif); 4359 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4360 if (!sband) 4361 return bcn; 4362 4363 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4364 4365 return bcn; 4366 } 4367 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4368 4369 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4370 struct ieee80211_vif *vif) 4371 { 4372 struct ieee80211_if_ap *ap = NULL; 4373 struct sk_buff *skb = NULL; 4374 struct probe_resp *presp = NULL; 4375 struct ieee80211_hdr *hdr; 4376 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4377 4378 if (sdata->vif.type != NL80211_IFTYPE_AP) 4379 return NULL; 4380 4381 rcu_read_lock(); 4382 4383 ap = &sdata->u.ap; 4384 presp = rcu_dereference(ap->probe_resp); 4385 if (!presp) 4386 goto out; 4387 4388 skb = dev_alloc_skb(presp->len); 4389 if (!skb) 4390 goto out; 4391 4392 skb_put_data(skb, presp->data, presp->len); 4393 4394 hdr = (struct ieee80211_hdr *) skb->data; 4395 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4396 4397 out: 4398 rcu_read_unlock(); 4399 return skb; 4400 } 4401 EXPORT_SYMBOL(ieee80211_proberesp_get); 4402 4403 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4404 struct ieee80211_vif *vif) 4405 { 4406 struct ieee80211_sub_if_data *sdata; 4407 struct ieee80211_if_managed *ifmgd; 4408 struct ieee80211_pspoll *pspoll; 4409 struct ieee80211_local *local; 4410 struct sk_buff *skb; 4411 4412 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4413 return NULL; 4414 4415 sdata = vif_to_sdata(vif); 4416 ifmgd = &sdata->u.mgd; 4417 local = sdata->local; 4418 4419 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4420 if (!skb) 4421 return NULL; 4422 4423 skb_reserve(skb, local->hw.extra_tx_headroom); 4424 4425 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4426 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4427 IEEE80211_STYPE_PSPOLL); 4428 pspoll->aid = cpu_to_le16(ifmgd->aid); 4429 4430 /* aid in PS-Poll has its two MSBs each set to 1 */ 4431 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4432 4433 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4434 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4435 4436 return skb; 4437 } 4438 EXPORT_SYMBOL(ieee80211_pspoll_get); 4439 4440 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4441 struct ieee80211_vif *vif, 4442 bool qos_ok) 4443 { 4444 struct ieee80211_hdr_3addr *nullfunc; 4445 struct ieee80211_sub_if_data *sdata; 4446 struct ieee80211_if_managed *ifmgd; 4447 struct ieee80211_local *local; 4448 struct sk_buff *skb; 4449 bool qos = false; 4450 4451 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4452 return NULL; 4453 4454 sdata = vif_to_sdata(vif); 4455 ifmgd = &sdata->u.mgd; 4456 local = sdata->local; 4457 4458 if (qos_ok) { 4459 struct sta_info *sta; 4460 4461 rcu_read_lock(); 4462 sta = sta_info_get(sdata, ifmgd->bssid); 4463 qos = sta && sta->sta.wme; 4464 rcu_read_unlock(); 4465 } 4466 4467 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4468 sizeof(*nullfunc) + 2); 4469 if (!skb) 4470 return NULL; 4471 4472 skb_reserve(skb, local->hw.extra_tx_headroom); 4473 4474 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4475 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4476 IEEE80211_STYPE_NULLFUNC | 4477 IEEE80211_FCTL_TODS); 4478 if (qos) { 4479 __le16 qos = cpu_to_le16(7); 4480 4481 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4482 IEEE80211_STYPE_NULLFUNC) != 4483 IEEE80211_STYPE_QOS_NULLFUNC); 4484 nullfunc->frame_control |= 4485 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4486 skb->priority = 7; 4487 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4488 skb_put_data(skb, &qos, sizeof(qos)); 4489 } 4490 4491 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4492 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4493 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4494 4495 return skb; 4496 } 4497 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4498 4499 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4500 const u8 *src_addr, 4501 const u8 *ssid, size_t ssid_len, 4502 size_t tailroom) 4503 { 4504 struct ieee80211_local *local = hw_to_local(hw); 4505 struct ieee80211_hdr_3addr *hdr; 4506 struct sk_buff *skb; 4507 size_t ie_ssid_len; 4508 u8 *pos; 4509 4510 ie_ssid_len = 2 + ssid_len; 4511 4512 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4513 ie_ssid_len + tailroom); 4514 if (!skb) 4515 return NULL; 4516 4517 skb_reserve(skb, local->hw.extra_tx_headroom); 4518 4519 hdr = skb_put_zero(skb, sizeof(*hdr)); 4520 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4521 IEEE80211_STYPE_PROBE_REQ); 4522 eth_broadcast_addr(hdr->addr1); 4523 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4524 eth_broadcast_addr(hdr->addr3); 4525 4526 pos = skb_put(skb, ie_ssid_len); 4527 *pos++ = WLAN_EID_SSID; 4528 *pos++ = ssid_len; 4529 if (ssid_len) 4530 memcpy(pos, ssid, ssid_len); 4531 pos += ssid_len; 4532 4533 return skb; 4534 } 4535 EXPORT_SYMBOL(ieee80211_probereq_get); 4536 4537 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4538 const void *frame, size_t frame_len, 4539 const struct ieee80211_tx_info *frame_txctl, 4540 struct ieee80211_rts *rts) 4541 { 4542 const struct ieee80211_hdr *hdr = frame; 4543 4544 rts->frame_control = 4545 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4546 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4547 frame_txctl); 4548 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4549 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4550 } 4551 EXPORT_SYMBOL(ieee80211_rts_get); 4552 4553 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4554 const void *frame, size_t frame_len, 4555 const struct ieee80211_tx_info *frame_txctl, 4556 struct ieee80211_cts *cts) 4557 { 4558 const struct ieee80211_hdr *hdr = frame; 4559 4560 cts->frame_control = 4561 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4562 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4563 frame_len, frame_txctl); 4564 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4565 } 4566 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4567 4568 struct sk_buff * 4569 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4570 struct ieee80211_vif *vif) 4571 { 4572 struct ieee80211_local *local = hw_to_local(hw); 4573 struct sk_buff *skb = NULL; 4574 struct ieee80211_tx_data tx; 4575 struct ieee80211_sub_if_data *sdata; 4576 struct ps_data *ps; 4577 struct ieee80211_tx_info *info; 4578 struct ieee80211_chanctx_conf *chanctx_conf; 4579 4580 sdata = vif_to_sdata(vif); 4581 4582 rcu_read_lock(); 4583 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4584 4585 if (!chanctx_conf) 4586 goto out; 4587 4588 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4589 struct beacon_data *beacon = 4590 rcu_dereference(sdata->u.ap.beacon); 4591 4592 if (!beacon || !beacon->head) 4593 goto out; 4594 4595 ps = &sdata->u.ap.ps; 4596 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4597 ps = &sdata->u.mesh.ps; 4598 } else { 4599 goto out; 4600 } 4601 4602 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4603 goto out; /* send buffered bc/mc only after DTIM beacon */ 4604 4605 while (1) { 4606 skb = skb_dequeue(&ps->bc_buf); 4607 if (!skb) 4608 goto out; 4609 local->total_ps_buffered--; 4610 4611 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4612 struct ieee80211_hdr *hdr = 4613 (struct ieee80211_hdr *) skb->data; 4614 /* more buffered multicast/broadcast frames ==> set 4615 * MoreData flag in IEEE 802.11 header to inform PS 4616 * STAs */ 4617 hdr->frame_control |= 4618 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4619 } 4620 4621 if (sdata->vif.type == NL80211_IFTYPE_AP) 4622 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4623 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4624 break; 4625 ieee80211_free_txskb(hw, skb); 4626 } 4627 4628 info = IEEE80211_SKB_CB(skb); 4629 4630 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4631 info->band = chanctx_conf->def.chan->band; 4632 4633 if (invoke_tx_handlers(&tx)) 4634 skb = NULL; 4635 out: 4636 rcu_read_unlock(); 4637 4638 return skb; 4639 } 4640 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4641 4642 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4643 { 4644 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4645 struct ieee80211_sub_if_data *sdata = sta->sdata; 4646 struct ieee80211_local *local = sdata->local; 4647 int ret; 4648 u32 queues; 4649 4650 lockdep_assert_held(&local->sta_mtx); 4651 4652 /* only some cases are supported right now */ 4653 switch (sdata->vif.type) { 4654 case NL80211_IFTYPE_STATION: 4655 case NL80211_IFTYPE_AP: 4656 case NL80211_IFTYPE_AP_VLAN: 4657 break; 4658 default: 4659 WARN_ON(1); 4660 return -EINVAL; 4661 } 4662 4663 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4664 return -EINVAL; 4665 4666 if (sta->reserved_tid == tid) { 4667 ret = 0; 4668 goto out; 4669 } 4670 4671 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4672 sdata_err(sdata, "TID reservation already active\n"); 4673 ret = -EALREADY; 4674 goto out; 4675 } 4676 4677 ieee80211_stop_vif_queues(sdata->local, sdata, 4678 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4679 4680 synchronize_net(); 4681 4682 /* Tear down BA sessions so we stop aggregating on this TID */ 4683 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4684 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4685 __ieee80211_stop_tx_ba_session(sta, tid, 4686 AGG_STOP_LOCAL_REQUEST); 4687 } 4688 4689 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4690 __ieee80211_flush_queues(local, sdata, queues, false); 4691 4692 sta->reserved_tid = tid; 4693 4694 ieee80211_wake_vif_queues(local, sdata, 4695 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4696 4697 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4698 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4699 4700 ret = 0; 4701 out: 4702 return ret; 4703 } 4704 EXPORT_SYMBOL(ieee80211_reserve_tid); 4705 4706 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4707 { 4708 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4709 struct ieee80211_sub_if_data *sdata = sta->sdata; 4710 4711 lockdep_assert_held(&sdata->local->sta_mtx); 4712 4713 /* only some cases are supported right now */ 4714 switch (sdata->vif.type) { 4715 case NL80211_IFTYPE_STATION: 4716 case NL80211_IFTYPE_AP: 4717 case NL80211_IFTYPE_AP_VLAN: 4718 break; 4719 default: 4720 WARN_ON(1); 4721 return; 4722 } 4723 4724 if (tid != sta->reserved_tid) { 4725 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4726 return; 4727 } 4728 4729 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4730 } 4731 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4732 4733 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4734 struct sk_buff *skb, int tid, 4735 enum nl80211_band band) 4736 { 4737 int ac = ieee80211_ac_from_tid(tid); 4738 4739 skb_reset_mac_header(skb); 4740 skb_set_queue_mapping(skb, ac); 4741 skb->priority = tid; 4742 4743 skb->dev = sdata->dev; 4744 4745 /* 4746 * The other path calling ieee80211_xmit is from the tasklet, 4747 * and while we can handle concurrent transmissions locking 4748 * requirements are that we do not come into tx with bhs on. 4749 */ 4750 local_bh_disable(); 4751 IEEE80211_SKB_CB(skb)->band = band; 4752 ieee80211_xmit(sdata, NULL, skb); 4753 local_bh_enable(); 4754 } 4755