1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "led.h" 32 #include "mesh.h" 33 #include "wep.h" 34 #include "wpa.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 /* misc utils */ 39 40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 41 { 42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 43 44 u64_stats_update_begin(&tstats->syncp); 45 tstats->tx_packets++; 46 tstats->tx_bytes += len; 47 u64_stats_update_end(&tstats->syncp); 48 } 49 50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 51 struct sk_buff *skb, int group_addr, 52 int next_frag_len) 53 { 54 int rate, mrate, erp, dur, i, shift = 0; 55 struct ieee80211_rate *txrate; 56 struct ieee80211_local *local = tx->local; 57 struct ieee80211_supported_band *sband; 58 struct ieee80211_hdr *hdr; 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 60 struct ieee80211_chanctx_conf *chanctx_conf; 61 u32 rate_flags = 0; 62 63 rcu_read_lock(); 64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 65 if (chanctx_conf) { 66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 68 } 69 rcu_read_unlock(); 70 71 /* assume HW handles this */ 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 73 return 0; 74 75 /* uh huh? */ 76 if (WARN_ON_ONCE(tx->rate.idx < 0)) 77 return 0; 78 79 sband = local->hw.wiphy->bands[info->band]; 80 txrate = &sband->bitrates[tx->rate.idx]; 81 82 erp = txrate->flags & IEEE80211_RATE_ERP_G; 83 84 /* 85 * data and mgmt (except PS Poll): 86 * - during CFP: 32768 87 * - during contention period: 88 * if addr1 is group address: 0 89 * if more fragments = 0 and addr1 is individual address: time to 90 * transmit one ACK plus SIFS 91 * if more fragments = 1 and addr1 is individual address: time to 92 * transmit next fragment plus 2 x ACK plus 3 x SIFS 93 * 94 * IEEE 802.11, 9.6: 95 * - control response frame (CTS or ACK) shall be transmitted using the 96 * same rate as the immediately previous frame in the frame exchange 97 * sequence, if this rate belongs to the PHY mandatory rates, or else 98 * at the highest possible rate belonging to the PHY rates in the 99 * BSSBasicRateSet 100 */ 101 hdr = (struct ieee80211_hdr *)skb->data; 102 if (ieee80211_is_ctl(hdr->frame_control)) { 103 /* TODO: These control frames are not currently sent by 104 * mac80211, but should they be implemented, this function 105 * needs to be updated to support duration field calculation. 106 * 107 * RTS: time needed to transmit pending data/mgmt frame plus 108 * one CTS frame plus one ACK frame plus 3 x SIFS 109 * CTS: duration of immediately previous RTS minus time 110 * required to transmit CTS and its SIFS 111 * ACK: 0 if immediately previous directed data/mgmt had 112 * more=0, with more=1 duration in ACK frame is duration 113 * from previous frame minus time needed to transmit ACK 114 * and its SIFS 115 * PS Poll: BIT(15) | BIT(14) | aid 116 */ 117 return 0; 118 } 119 120 /* data/mgmt */ 121 if (0 /* FIX: data/mgmt during CFP */) 122 return cpu_to_le16(32768); 123 124 if (group_addr) /* Group address as the destination - no ACK */ 125 return 0; 126 127 /* Individual destination address: 128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 129 * CTS and ACK frames shall be transmitted using the highest rate in 130 * basic rate set that is less than or equal to the rate of the 131 * immediately previous frame and that is using the same modulation 132 * (CCK or OFDM). If no basic rate set matches with these requirements, 133 * the highest mandatory rate of the PHY that is less than or equal to 134 * the rate of the previous frame is used. 135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 136 */ 137 rate = -1; 138 /* use lowest available if everything fails */ 139 mrate = sband->bitrates[0].bitrate; 140 for (i = 0; i < sband->n_bitrates; i++) { 141 struct ieee80211_rate *r = &sband->bitrates[i]; 142 143 if (r->bitrate > txrate->bitrate) 144 break; 145 146 if ((rate_flags & r->flags) != rate_flags) 147 continue; 148 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 151 152 switch (sband->band) { 153 case IEEE80211_BAND_2GHZ: { 154 u32 flag; 155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 156 flag = IEEE80211_RATE_MANDATORY_G; 157 else 158 flag = IEEE80211_RATE_MANDATORY_B; 159 if (r->flags & flag) 160 mrate = r->bitrate; 161 break; 162 } 163 case IEEE80211_BAND_5GHZ: 164 if (r->flags & IEEE80211_RATE_MANDATORY_A) 165 mrate = r->bitrate; 166 break; 167 case IEEE80211_BAND_60GHZ: 168 /* TODO, for now fall through */ 169 case IEEE80211_NUM_BANDS: 170 WARN_ON(1); 171 break; 172 } 173 } 174 if (rate == -1) { 175 /* No matching basic rate found; use highest suitable mandatory 176 * PHY rate */ 177 rate = DIV_ROUND_UP(mrate, 1 << shift); 178 } 179 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 181 if (ieee80211_is_data_qos(hdr->frame_control) && 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 183 dur = 0; 184 else 185 /* Time needed to transmit ACK 186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 187 * to closest integer */ 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 192 if (next_frag_len) { 193 /* Frame is fragmented: duration increases with time needed to 194 * transmit next fragment plus ACK and 2 x SIFS. */ 195 dur *= 2; /* ACK + SIFS */ 196 /* next fragment */ 197 dur += ieee80211_frame_duration(sband->band, next_frag_len, 198 txrate->bitrate, erp, 199 tx->sdata->vif.bss_conf.use_short_preamble, 200 shift); 201 } 202 203 return cpu_to_le16(dur); 204 } 205 206 /* tx handlers */ 207 static ieee80211_tx_result debug_noinline 208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 209 { 210 struct ieee80211_local *local = tx->local; 211 struct ieee80211_if_managed *ifmgd; 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 ifmgd = &tx->sdata->u.mgd; 241 242 /* 243 * Don't wakeup from power save if u-apsd is enabled, voip ac has 244 * u-apsd enabled and the frame is in voip class. This effectively 245 * means that even if all access categories have u-apsd enabled, in 246 * practise u-apsd is only used with the voip ac. This is a 247 * workaround for the case when received voip class packets do not 248 * have correct qos tag for some reason, due the network or the 249 * peer application. 250 * 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is 252 * changed via debugfs, user needs to reassociate manually to have 253 * everything in sync. 254 */ 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 258 return TX_CONTINUE; 259 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 261 ieee80211_stop_queues_by_reason(&local->hw, 262 IEEE80211_MAX_QUEUE_MAP, 263 IEEE80211_QUEUE_STOP_REASON_PS, 264 false); 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 266 ieee80211_queue_work(&local->hw, 267 &local->dynamic_ps_disable_work); 268 } 269 270 /* Don't restart the timer if we're not disassociated */ 271 if (!ifmgd->associated) 272 return TX_CONTINUE; 273 274 mod_timer(&local->dynamic_ps_timer, jiffies + 275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 276 277 return TX_CONTINUE; 278 } 279 280 static ieee80211_tx_result debug_noinline 281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 282 { 283 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 286 bool assoc = false; 287 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 289 return TX_CONTINUE; 290 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 293 !ieee80211_is_probe_req(hdr->frame_control) && 294 !ieee80211_is_nullfunc(hdr->frame_control)) 295 /* 296 * When software scanning only nullfunc frames (to notify 297 * the sleep state to the AP) and probe requests (for the 298 * active scan) are allowed, all other frames should not be 299 * sent and we should not get here, but if we do 300 * nonetheless, drop them to avoid sending them 301 * off-channel. See the link below and 302 * ieee80211_start_scan() for more. 303 * 304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 305 */ 306 return TX_DROP; 307 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 309 return TX_CONTINUE; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 335 ieee80211_is_data(hdr->frame_control) && 336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 dev_kfree_skb(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 dev_kfree_skb(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_mgmt(hdr->frame_control) && 597 is_multicast_ether_addr(hdr->addr1) && 598 ieee80211_is_robust_mgmt_frame(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 600 tx->key = key; 601 else if (is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (!is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_unicast_key))) 606 tx->key = key; 607 else 608 tx->key = NULL; 609 610 if (tx->key) { 611 bool skip_hw = false; 612 613 tx->key->tx_rx_count++; 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb)) 630 tx->key = NULL; 631 else 632 skip_hw = (tx->key->conf.flags & 633 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 634 ieee80211_is_mgmt(hdr->frame_control); 635 break; 636 case WLAN_CIPHER_SUITE_AES_CMAC: 637 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 638 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 640 if (!ieee80211_is_mgmt(hdr->frame_control)) 641 tx->key = NULL; 642 break; 643 } 644 645 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 646 !ieee80211_is_deauth(hdr->frame_control))) 647 return TX_DROP; 648 649 if (!skip_hw && tx->key && 650 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 651 info->control.hw_key = &tx->key->conf; 652 } 653 654 return TX_CONTINUE; 655 } 656 657 static ieee80211_tx_result debug_noinline 658 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 659 { 660 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 661 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 662 struct ieee80211_supported_band *sband; 663 u32 len; 664 struct ieee80211_tx_rate_control txrc; 665 struct ieee80211_sta_rates *ratetbl = NULL; 666 bool assoc = false; 667 668 memset(&txrc, 0, sizeof(txrc)); 669 670 sband = tx->local->hw.wiphy->bands[info->band]; 671 672 len = min_t(u32, tx->skb->len + FCS_LEN, 673 tx->local->hw.wiphy->frag_threshold); 674 675 /* set up the tx rate control struct we give the RC algo */ 676 txrc.hw = &tx->local->hw; 677 txrc.sband = sband; 678 txrc.bss_conf = &tx->sdata->vif.bss_conf; 679 txrc.skb = tx->skb; 680 txrc.reported_rate.idx = -1; 681 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 682 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 683 txrc.max_rate_idx = -1; 684 else 685 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 686 687 if (tx->sdata->rc_has_mcs_mask[info->band]) 688 txrc.rate_idx_mcs_mask = 689 tx->sdata->rc_rateidx_mcs_mask[info->band]; 690 691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 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 if (tx->sta) 717 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 718 719 /* 720 * Lets not bother rate control if we're associated and cannot 721 * talk to the sta. This should not happen. 722 */ 723 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 724 !rate_usable_index_exists(sband, &tx->sta->sta), 725 "%s: Dropped data frame as no usable bitrate found while " 726 "scanning and associated. Target station: " 727 "%pM on %d GHz band\n", 728 tx->sdata->name, hdr->addr1, 729 info->band ? 5 : 2)) 730 return TX_DROP; 731 732 /* 733 * If we're associated with the sta at this point we know we can at 734 * least send the frame at the lowest bit rate. 735 */ 736 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 737 738 if (tx->sta && !info->control.skip_table) 739 ratetbl = rcu_dereference(tx->sta->sta.rates); 740 741 if (unlikely(info->control.rates[0].idx < 0)) { 742 if (ratetbl) { 743 struct ieee80211_tx_rate rate = { 744 .idx = ratetbl->rate[0].idx, 745 .flags = ratetbl->rate[0].flags, 746 .count = ratetbl->rate[0].count 747 }; 748 749 if (ratetbl->rate[0].idx < 0) 750 return TX_DROP; 751 752 tx->rate = rate; 753 } else { 754 return TX_DROP; 755 } 756 } else { 757 tx->rate = info->control.rates[0]; 758 } 759 760 if (txrc.reported_rate.idx < 0) { 761 txrc.reported_rate = tx->rate; 762 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 763 tx->sta->last_tx_rate = txrc.reported_rate; 764 } else if (tx->sta) 765 tx->sta->last_tx_rate = txrc.reported_rate; 766 767 if (ratetbl) 768 return TX_CONTINUE; 769 770 if (unlikely(!info->control.rates[0].count)) 771 info->control.rates[0].count = 1; 772 773 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 774 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 775 info->control.rates[0].count = 1; 776 777 return TX_CONTINUE; 778 } 779 780 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 781 { 782 u16 *seq = &sta->tid_seq[tid]; 783 __le16 ret = cpu_to_le16(*seq); 784 785 /* Increase the sequence number. */ 786 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 787 788 return ret; 789 } 790 791 static ieee80211_tx_result debug_noinline 792 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 793 { 794 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 795 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 796 u8 *qc; 797 int tid; 798 799 /* 800 * Packet injection may want to control the sequence 801 * number, if we have no matching interface then we 802 * neither assign one ourselves nor ask the driver to. 803 */ 804 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 805 return TX_CONTINUE; 806 807 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 808 return TX_CONTINUE; 809 810 if (ieee80211_hdrlen(hdr->frame_control) < 24) 811 return TX_CONTINUE; 812 813 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 814 return TX_CONTINUE; 815 816 /* 817 * Anything but QoS data that has a sequence number field 818 * (is long enough) gets a sequence number from the global 819 * counter. QoS data frames with a multicast destination 820 * also use the global counter (802.11-2012 9.3.2.10). 821 */ 822 if (!ieee80211_is_data_qos(hdr->frame_control) || 823 is_multicast_ether_addr(hdr->addr1)) { 824 /* driver should assign sequence number */ 825 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 826 /* for pure STA mode without beacons, we can do it */ 827 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 828 tx->sdata->sequence_number += 0x10; 829 if (tx->sta) 830 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++; 831 return TX_CONTINUE; 832 } 833 834 /* 835 * This should be true for injected/management frames only, for 836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 837 * above since they are not QoS-data frames. 838 */ 839 if (!tx->sta) 840 return TX_CONTINUE; 841 842 /* include per-STA, per-TID sequence counter */ 843 844 qc = ieee80211_get_qos_ctl(hdr); 845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 846 tx->sta->tx_msdu[tid]++; 847 848 if (!tx->sta->sta.txq[0]) 849 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 850 851 return TX_CONTINUE; 852 } 853 854 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 855 struct sk_buff *skb, int hdrlen, 856 int frag_threshold) 857 { 858 struct ieee80211_local *local = tx->local; 859 struct ieee80211_tx_info *info; 860 struct sk_buff *tmp; 861 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 862 int pos = hdrlen + per_fragm; 863 int rem = skb->len - hdrlen - per_fragm; 864 865 if (WARN_ON(rem < 0)) 866 return -EINVAL; 867 868 /* first fragment was already added to queue by caller */ 869 870 while (rem) { 871 int fraglen = per_fragm; 872 873 if (fraglen > rem) 874 fraglen = rem; 875 rem -= fraglen; 876 tmp = dev_alloc_skb(local->tx_headroom + 877 frag_threshold + 878 tx->sdata->encrypt_headroom + 879 IEEE80211_ENCRYPT_TAILROOM); 880 if (!tmp) 881 return -ENOMEM; 882 883 __skb_queue_tail(&tx->skbs, tmp); 884 885 skb_reserve(tmp, 886 local->tx_headroom + tx->sdata->encrypt_headroom); 887 888 /* copy control information */ 889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 890 891 info = IEEE80211_SKB_CB(tmp); 892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 893 IEEE80211_TX_CTL_FIRST_FRAGMENT); 894 895 if (rem) 896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 897 898 skb_copy_queue_mapping(tmp, skb); 899 tmp->priority = skb->priority; 900 tmp->dev = skb->dev; 901 902 /* copy header and data */ 903 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 904 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 905 906 pos += fraglen; 907 } 908 909 /* adjust first fragment's length */ 910 skb_trim(skb, hdrlen + per_fragm); 911 return 0; 912 } 913 914 static ieee80211_tx_result debug_noinline 915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 916 { 917 struct sk_buff *skb = tx->skb; 918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 919 struct ieee80211_hdr *hdr = (void *)skb->data; 920 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 921 int hdrlen; 922 int fragnum; 923 924 /* no matter what happens, tx->skb moves to tx->skbs */ 925 __skb_queue_tail(&tx->skbs, skb); 926 tx->skb = NULL; 927 928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 929 return TX_CONTINUE; 930 931 if (tx->local->ops->set_frag_threshold) 932 return TX_CONTINUE; 933 934 /* 935 * Warn when submitting a fragmented A-MPDU frame and drop it. 936 * This scenario is handled in ieee80211_tx_prepare but extra 937 * caution taken here as fragmented ampdu may cause Tx stop. 938 */ 939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 940 return TX_DROP; 941 942 hdrlen = ieee80211_hdrlen(hdr->frame_control); 943 944 /* internal error, why isn't DONTFRAG set? */ 945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 946 return TX_DROP; 947 948 /* 949 * Now fragment the frame. This will allocate all the fragments and 950 * chain them (using skb as the first fragment) to skb->next. 951 * During transmission, we will remove the successfully transmitted 952 * fragments from this list. When the low-level driver rejects one 953 * of the fragments then we will simply pretend to accept the skb 954 * but store it away as pending. 955 */ 956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 957 return TX_DROP; 958 959 /* update duration/seq/flags of fragments */ 960 fragnum = 0; 961 962 skb_queue_walk(&tx->skbs, skb) { 963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 964 965 hdr = (void *)skb->data; 966 info = IEEE80211_SKB_CB(skb); 967 968 if (!skb_queue_is_last(&tx->skbs, skb)) { 969 hdr->frame_control |= morefrags; 970 /* 971 * No multi-rate retries for fragmented frames, that 972 * would completely throw off the NAV at other STAs. 973 */ 974 info->control.rates[1].idx = -1; 975 info->control.rates[2].idx = -1; 976 info->control.rates[3].idx = -1; 977 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 978 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 979 } else { 980 hdr->frame_control &= ~morefrags; 981 } 982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 983 fragnum++; 984 } 985 986 return TX_CONTINUE; 987 } 988 989 static ieee80211_tx_result debug_noinline 990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 991 { 992 struct sk_buff *skb; 993 int ac = -1; 994 995 if (!tx->sta) 996 return TX_CONTINUE; 997 998 skb_queue_walk(&tx->skbs, skb) { 999 ac = skb_get_queue_mapping(skb); 1000 tx->sta->tx_bytes[ac] += skb->len; 1001 } 1002 if (ac >= 0) 1003 tx->sta->tx_packets[ac]++; 1004 1005 return TX_CONTINUE; 1006 } 1007 1008 static ieee80211_tx_result debug_noinline 1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1010 { 1011 if (!tx->key) 1012 return TX_CONTINUE; 1013 1014 switch (tx->key->conf.cipher) { 1015 case WLAN_CIPHER_SUITE_WEP40: 1016 case WLAN_CIPHER_SUITE_WEP104: 1017 return ieee80211_crypto_wep_encrypt(tx); 1018 case WLAN_CIPHER_SUITE_TKIP: 1019 return ieee80211_crypto_tkip_encrypt(tx); 1020 case WLAN_CIPHER_SUITE_CCMP: 1021 return ieee80211_crypto_ccmp_encrypt( 1022 tx, IEEE80211_CCMP_MIC_LEN); 1023 case WLAN_CIPHER_SUITE_CCMP_256: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_256_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_AES_CMAC: 1027 return ieee80211_crypto_aes_cmac_encrypt(tx); 1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1032 return ieee80211_crypto_aes_gmac_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_GCMP: 1034 case WLAN_CIPHER_SUITE_GCMP_256: 1035 return ieee80211_crypto_gcmp_encrypt(tx); 1036 default: 1037 return ieee80211_crypto_hw_encrypt(tx); 1038 } 1039 1040 return TX_DROP; 1041 } 1042 1043 static ieee80211_tx_result debug_noinline 1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1045 { 1046 struct sk_buff *skb; 1047 struct ieee80211_hdr *hdr; 1048 int next_len; 1049 bool group_addr; 1050 1051 skb_queue_walk(&tx->skbs, skb) { 1052 hdr = (void *) skb->data; 1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1054 break; /* must not overwrite AID */ 1055 if (!skb_queue_is_last(&tx->skbs, skb)) { 1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1057 next_len = next->len; 1058 } else 1059 next_len = 0; 1060 group_addr = is_multicast_ether_addr(hdr->addr1); 1061 1062 hdr->duration_id = 1063 ieee80211_duration(tx, skb, group_addr, next_len); 1064 } 1065 1066 return TX_CONTINUE; 1067 } 1068 1069 /* actual transmit path */ 1070 1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1072 struct sk_buff *skb, 1073 struct ieee80211_tx_info *info, 1074 struct tid_ampdu_tx *tid_tx, 1075 int tid) 1076 { 1077 bool queued = false; 1078 bool reset_agg_timer = false; 1079 struct sk_buff *purge_skb = NULL; 1080 1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1082 info->flags |= IEEE80211_TX_CTL_AMPDU; 1083 reset_agg_timer = true; 1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1085 /* 1086 * nothing -- this aggregation session is being started 1087 * but that might still fail with the driver 1088 */ 1089 } else if (!tx->sta->sta.txq[tid]) { 1090 spin_lock(&tx->sta->lock); 1091 /* 1092 * Need to re-check now, because we may get here 1093 * 1094 * 1) in the window during which the setup is actually 1095 * already done, but not marked yet because not all 1096 * packets are spliced over to the driver pending 1097 * queue yet -- if this happened we acquire the lock 1098 * either before or after the splice happens, but 1099 * need to recheck which of these cases happened. 1100 * 1101 * 2) during session teardown, if the OPERATIONAL bit 1102 * was cleared due to the teardown but the pointer 1103 * hasn't been assigned NULL yet (or we loaded it 1104 * before it was assigned) -- in this case it may 1105 * now be NULL which means we should just let the 1106 * packet pass through because splicing the frames 1107 * back is already done. 1108 */ 1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1110 1111 if (!tid_tx) { 1112 /* do nothing, let packet pass through */ 1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1114 info->flags |= IEEE80211_TX_CTL_AMPDU; 1115 reset_agg_timer = true; 1116 } else { 1117 queued = true; 1118 info->control.vif = &tx->sdata->vif; 1119 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1120 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1121 __skb_queue_tail(&tid_tx->pending, skb); 1122 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1123 purge_skb = __skb_dequeue(&tid_tx->pending); 1124 } 1125 spin_unlock(&tx->sta->lock); 1126 1127 if (purge_skb) 1128 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1129 } 1130 1131 /* reset session timer */ 1132 if (reset_agg_timer && tid_tx->timeout) 1133 tid_tx->last_tx = jiffies; 1134 1135 return queued; 1136 } 1137 1138 /* 1139 * initialises @tx 1140 * pass %NULL for the station if unknown, a valid pointer if known 1141 * or an ERR_PTR() if the station is known not to exist 1142 */ 1143 static ieee80211_tx_result 1144 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1145 struct ieee80211_tx_data *tx, 1146 struct sta_info *sta, struct sk_buff *skb) 1147 { 1148 struct ieee80211_local *local = sdata->local; 1149 struct ieee80211_hdr *hdr; 1150 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1151 int tid; 1152 u8 *qc; 1153 1154 memset(tx, 0, sizeof(*tx)); 1155 tx->skb = skb; 1156 tx->local = local; 1157 tx->sdata = sdata; 1158 __skb_queue_head_init(&tx->skbs); 1159 1160 /* 1161 * If this flag is set to true anywhere, and we get here, 1162 * we are doing the needed processing, so remove the flag 1163 * now. 1164 */ 1165 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1166 1167 hdr = (struct ieee80211_hdr *) skb->data; 1168 1169 if (likely(sta)) { 1170 if (!IS_ERR(sta)) 1171 tx->sta = sta; 1172 } else { 1173 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1174 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1175 if (!tx->sta && sdata->wdev.use_4addr) 1176 return TX_DROP; 1177 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1178 IEEE80211_TX_CTL_INJECTED) || 1179 tx->sdata->control_port_protocol == tx->skb->protocol) { 1180 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1181 } 1182 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1183 tx->sta = sta_info_get(sdata, hdr->addr1); 1184 } 1185 1186 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1187 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1188 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1189 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1190 struct tid_ampdu_tx *tid_tx; 1191 1192 qc = ieee80211_get_qos_ctl(hdr); 1193 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1194 1195 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1196 if (tid_tx) { 1197 bool queued; 1198 1199 queued = ieee80211_tx_prep_agg(tx, skb, info, 1200 tid_tx, tid); 1201 1202 if (unlikely(queued)) 1203 return TX_QUEUED; 1204 } 1205 } 1206 1207 if (is_multicast_ether_addr(hdr->addr1)) { 1208 tx->flags &= ~IEEE80211_TX_UNICAST; 1209 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1210 } else 1211 tx->flags |= IEEE80211_TX_UNICAST; 1212 1213 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1214 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1215 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1216 info->flags & IEEE80211_TX_CTL_AMPDU) 1217 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1218 } 1219 1220 if (!tx->sta) 1221 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1222 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1223 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1224 1225 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1226 1227 return TX_CONTINUE; 1228 } 1229 1230 static void ieee80211_drv_tx(struct ieee80211_local *local, 1231 struct ieee80211_vif *vif, 1232 struct ieee80211_sta *pubsta, 1233 struct sk_buff *skb) 1234 { 1235 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1236 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1237 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1238 struct ieee80211_tx_control control = { 1239 .sta = pubsta, 1240 }; 1241 struct ieee80211_txq *txq = NULL; 1242 struct txq_info *txqi; 1243 u8 ac; 1244 1245 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE) 1246 goto tx_normal; 1247 1248 if (!ieee80211_is_data(hdr->frame_control)) 1249 goto tx_normal; 1250 1251 if (pubsta) { 1252 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1253 1254 txq = pubsta->txq[tid]; 1255 } else if (vif) { 1256 txq = vif->txq; 1257 } 1258 1259 if (!txq) 1260 goto tx_normal; 1261 1262 ac = txq->ac; 1263 txqi = to_txq_info(txq); 1264 atomic_inc(&sdata->txqs_len[ac]); 1265 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending) 1266 netif_stop_subqueue(sdata->dev, ac); 1267 1268 skb_queue_tail(&txqi->queue, skb); 1269 drv_wake_tx_queue(local, txqi); 1270 1271 return; 1272 1273 tx_normal: 1274 drv_tx(local, &control, skb); 1275 } 1276 1277 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1278 struct ieee80211_txq *txq) 1279 { 1280 struct ieee80211_local *local = hw_to_local(hw); 1281 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif); 1282 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1283 struct ieee80211_hdr *hdr; 1284 struct sk_buff *skb = NULL; 1285 u8 ac = txq->ac; 1286 1287 spin_lock_bh(&txqi->queue.lock); 1288 1289 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1290 goto out; 1291 1292 skb = __skb_dequeue(&txqi->queue); 1293 if (!skb) 1294 goto out; 1295 1296 atomic_dec(&sdata->txqs_len[ac]); 1297 if (__netif_subqueue_stopped(sdata->dev, ac)) 1298 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]); 1299 1300 hdr = (struct ieee80211_hdr *)skb->data; 1301 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1302 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1303 sta); 1304 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1305 1306 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1307 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1308 info->flags |= IEEE80211_TX_CTL_AMPDU; 1309 else 1310 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1311 } 1312 1313 out: 1314 spin_unlock_bh(&txqi->queue.lock); 1315 1316 return skb; 1317 } 1318 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1319 1320 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1321 struct ieee80211_vif *vif, 1322 struct ieee80211_sta *sta, 1323 struct sk_buff_head *skbs, 1324 bool txpending) 1325 { 1326 struct sk_buff *skb, *tmp; 1327 unsigned long flags; 1328 1329 skb_queue_walk_safe(skbs, skb, tmp) { 1330 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1331 int q = info->hw_queue; 1332 1333 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1334 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1335 __skb_unlink(skb, skbs); 1336 ieee80211_free_txskb(&local->hw, skb); 1337 continue; 1338 } 1339 #endif 1340 1341 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1342 if (local->queue_stop_reasons[q] || 1343 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1344 if (unlikely(info->flags & 1345 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1346 if (local->queue_stop_reasons[q] & 1347 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1348 /* 1349 * Drop off-channel frames if queues 1350 * are stopped for any reason other 1351 * than off-channel operation. Never 1352 * queue them. 1353 */ 1354 spin_unlock_irqrestore( 1355 &local->queue_stop_reason_lock, 1356 flags); 1357 ieee80211_purge_tx_queue(&local->hw, 1358 skbs); 1359 return true; 1360 } 1361 } else { 1362 1363 /* 1364 * Since queue is stopped, queue up frames for 1365 * later transmission from the tx-pending 1366 * tasklet when the queue is woken again. 1367 */ 1368 if (txpending) 1369 skb_queue_splice_init(skbs, 1370 &local->pending[q]); 1371 else 1372 skb_queue_splice_tail_init(skbs, 1373 &local->pending[q]); 1374 1375 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1376 flags); 1377 return false; 1378 } 1379 } 1380 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1381 1382 info->control.vif = vif; 1383 1384 __skb_unlink(skb, skbs); 1385 ieee80211_drv_tx(local, vif, sta, skb); 1386 } 1387 1388 return true; 1389 } 1390 1391 /* 1392 * Returns false if the frame couldn't be transmitted but was queued instead. 1393 */ 1394 static bool __ieee80211_tx(struct ieee80211_local *local, 1395 struct sk_buff_head *skbs, int led_len, 1396 struct sta_info *sta, bool txpending) 1397 { 1398 struct ieee80211_tx_info *info; 1399 struct ieee80211_sub_if_data *sdata; 1400 struct ieee80211_vif *vif; 1401 struct ieee80211_sta *pubsta; 1402 struct sk_buff *skb; 1403 bool result = true; 1404 __le16 fc; 1405 1406 if (WARN_ON(skb_queue_empty(skbs))) 1407 return true; 1408 1409 skb = skb_peek(skbs); 1410 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1411 info = IEEE80211_SKB_CB(skb); 1412 sdata = vif_to_sdata(info->control.vif); 1413 if (sta && !sta->uploaded) 1414 sta = NULL; 1415 1416 if (sta) 1417 pubsta = &sta->sta; 1418 else 1419 pubsta = NULL; 1420 1421 switch (sdata->vif.type) { 1422 case NL80211_IFTYPE_MONITOR: 1423 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1424 vif = &sdata->vif; 1425 break; 1426 } 1427 sdata = rcu_dereference(local->monitor_sdata); 1428 if (sdata) { 1429 vif = &sdata->vif; 1430 info->hw_queue = 1431 vif->hw_queue[skb_get_queue_mapping(skb)]; 1432 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1433 dev_kfree_skb(skb); 1434 return true; 1435 } else 1436 vif = NULL; 1437 break; 1438 case NL80211_IFTYPE_AP_VLAN: 1439 sdata = container_of(sdata->bss, 1440 struct ieee80211_sub_if_data, u.ap); 1441 /* fall through */ 1442 default: 1443 vif = &sdata->vif; 1444 break; 1445 } 1446 1447 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1448 txpending); 1449 1450 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1451 1452 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1453 1454 return result; 1455 } 1456 1457 /* 1458 * Invoke TX handlers, return 0 on success and non-zero if the 1459 * frame was dropped or queued. 1460 */ 1461 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1462 { 1463 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1464 ieee80211_tx_result res = TX_DROP; 1465 1466 #define CALL_TXH(txh) \ 1467 do { \ 1468 res = txh(tx); \ 1469 if (res != TX_CONTINUE) \ 1470 goto txh_done; \ 1471 } while (0) 1472 1473 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1474 CALL_TXH(ieee80211_tx_h_check_assoc); 1475 CALL_TXH(ieee80211_tx_h_ps_buf); 1476 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1477 CALL_TXH(ieee80211_tx_h_select_key); 1478 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1479 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1480 1481 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1482 __skb_queue_tail(&tx->skbs, tx->skb); 1483 tx->skb = NULL; 1484 goto txh_done; 1485 } 1486 1487 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1488 CALL_TXH(ieee80211_tx_h_sequence); 1489 CALL_TXH(ieee80211_tx_h_fragment); 1490 /* handlers after fragment must be aware of tx info fragmentation! */ 1491 CALL_TXH(ieee80211_tx_h_stats); 1492 CALL_TXH(ieee80211_tx_h_encrypt); 1493 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1494 CALL_TXH(ieee80211_tx_h_calculate_duration); 1495 #undef CALL_TXH 1496 1497 txh_done: 1498 if (unlikely(res == TX_DROP)) { 1499 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1500 if (tx->skb) 1501 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1502 else 1503 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1504 return -1; 1505 } else if (unlikely(res == TX_QUEUED)) { 1506 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1507 return -1; 1508 } 1509 1510 return 0; 1511 } 1512 1513 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1514 struct ieee80211_vif *vif, struct sk_buff *skb, 1515 int band, struct ieee80211_sta **sta) 1516 { 1517 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1518 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1519 struct ieee80211_tx_data tx; 1520 struct sk_buff *skb2; 1521 1522 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1523 return false; 1524 1525 info->band = band; 1526 info->control.vif = vif; 1527 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1528 1529 if (invoke_tx_handlers(&tx)) 1530 return false; 1531 1532 if (sta) { 1533 if (tx.sta) 1534 *sta = &tx.sta->sta; 1535 else 1536 *sta = NULL; 1537 } 1538 1539 /* this function isn't suitable for fragmented data frames */ 1540 skb2 = __skb_dequeue(&tx.skbs); 1541 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1542 ieee80211_free_txskb(hw, skb2); 1543 ieee80211_purge_tx_queue(hw, &tx.skbs); 1544 return false; 1545 } 1546 1547 return true; 1548 } 1549 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1550 1551 /* 1552 * Returns false if the frame couldn't be transmitted but was queued instead. 1553 */ 1554 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1555 struct sta_info *sta, struct sk_buff *skb, 1556 bool txpending) 1557 { 1558 struct ieee80211_local *local = sdata->local; 1559 struct ieee80211_tx_data tx; 1560 ieee80211_tx_result res_prepare; 1561 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1562 bool result = true; 1563 int led_len; 1564 1565 if (unlikely(skb->len < 10)) { 1566 dev_kfree_skb(skb); 1567 return true; 1568 } 1569 1570 /* initialises tx */ 1571 led_len = skb->len; 1572 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1573 1574 if (unlikely(res_prepare == TX_DROP)) { 1575 ieee80211_free_txskb(&local->hw, skb); 1576 return true; 1577 } else if (unlikely(res_prepare == TX_QUEUED)) { 1578 return true; 1579 } 1580 1581 /* set up hw_queue value early */ 1582 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1583 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1584 info->hw_queue = 1585 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1586 1587 if (!invoke_tx_handlers(&tx)) 1588 result = __ieee80211_tx(local, &tx.skbs, led_len, 1589 tx.sta, txpending); 1590 1591 return result; 1592 } 1593 1594 /* device xmit handlers */ 1595 1596 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1597 struct sk_buff *skb, 1598 int head_need, bool may_encrypt) 1599 { 1600 struct ieee80211_local *local = sdata->local; 1601 int tail_need = 0; 1602 1603 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1604 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1605 tail_need -= skb_tailroom(skb); 1606 tail_need = max_t(int, tail_need, 0); 1607 } 1608 1609 if (skb_cloned(skb) && 1610 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1611 !skb_clone_writable(skb, ETH_HLEN) || 1612 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1613 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1614 else if (head_need || tail_need) 1615 I802_DEBUG_INC(local->tx_expand_skb_head); 1616 else 1617 return 0; 1618 1619 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1620 wiphy_debug(local->hw.wiphy, 1621 "failed to reallocate TX buffer\n"); 1622 return -ENOMEM; 1623 } 1624 1625 return 0; 1626 } 1627 1628 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1629 struct sta_info *sta, struct sk_buff *skb) 1630 { 1631 struct ieee80211_local *local = sdata->local; 1632 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1633 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1634 int headroom; 1635 bool may_encrypt; 1636 1637 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1638 1639 headroom = local->tx_headroom; 1640 if (may_encrypt) 1641 headroom += sdata->encrypt_headroom; 1642 headroom -= skb_headroom(skb); 1643 headroom = max_t(int, 0, headroom); 1644 1645 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1646 ieee80211_free_txskb(&local->hw, skb); 1647 return; 1648 } 1649 1650 hdr = (struct ieee80211_hdr *) skb->data; 1651 info->control.vif = &sdata->vif; 1652 1653 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1654 if (ieee80211_is_data(hdr->frame_control) && 1655 is_unicast_ether_addr(hdr->addr1)) { 1656 if (mesh_nexthop_resolve(sdata, skb)) 1657 return; /* skb queued: don't free */ 1658 } else { 1659 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1660 } 1661 } 1662 1663 ieee80211_set_qos_hdr(sdata, skb); 1664 ieee80211_tx(sdata, sta, skb, false); 1665 } 1666 1667 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1668 { 1669 struct ieee80211_radiotap_iterator iterator; 1670 struct ieee80211_radiotap_header *rthdr = 1671 (struct ieee80211_radiotap_header *) skb->data; 1672 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1673 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1674 NULL); 1675 u16 txflags; 1676 1677 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1678 IEEE80211_TX_CTL_DONTFRAG; 1679 1680 /* 1681 * for every radiotap entry that is present 1682 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1683 * entries present, or -EINVAL on error) 1684 */ 1685 1686 while (!ret) { 1687 ret = ieee80211_radiotap_iterator_next(&iterator); 1688 1689 if (ret) 1690 continue; 1691 1692 /* see if this argument is something we can use */ 1693 switch (iterator.this_arg_index) { 1694 /* 1695 * You must take care when dereferencing iterator.this_arg 1696 * for multibyte types... the pointer is not aligned. Use 1697 * get_unaligned((type *)iterator.this_arg) to dereference 1698 * iterator.this_arg for type "type" safely on all arches. 1699 */ 1700 case IEEE80211_RADIOTAP_FLAGS: 1701 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1702 /* 1703 * this indicates that the skb we have been 1704 * handed has the 32-bit FCS CRC at the end... 1705 * we should react to that by snipping it off 1706 * because it will be recomputed and added 1707 * on transmission 1708 */ 1709 if (skb->len < (iterator._max_length + FCS_LEN)) 1710 return false; 1711 1712 skb_trim(skb, skb->len - FCS_LEN); 1713 } 1714 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1715 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1716 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1717 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1718 break; 1719 1720 case IEEE80211_RADIOTAP_TX_FLAGS: 1721 txflags = get_unaligned_le16(iterator.this_arg); 1722 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1723 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1724 break; 1725 1726 /* 1727 * Please update the file 1728 * Documentation/networking/mac80211-injection.txt 1729 * when parsing new fields here. 1730 */ 1731 1732 default: 1733 break; 1734 } 1735 } 1736 1737 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1738 return false; 1739 1740 /* 1741 * remove the radiotap header 1742 * iterator->_max_length was sanity-checked against 1743 * skb->len by iterator init 1744 */ 1745 skb_pull(skb, iterator._max_length); 1746 1747 return true; 1748 } 1749 1750 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1751 struct net_device *dev) 1752 { 1753 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1754 struct ieee80211_chanctx_conf *chanctx_conf; 1755 struct ieee80211_radiotap_header *prthdr = 1756 (struct ieee80211_radiotap_header *)skb->data; 1757 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1758 struct ieee80211_hdr *hdr; 1759 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1760 struct cfg80211_chan_def *chandef; 1761 u16 len_rthdr; 1762 int hdrlen; 1763 1764 /* check for not even having the fixed radiotap header part */ 1765 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1766 goto fail; /* too short to be possibly valid */ 1767 1768 /* is it a header version we can trust to find length from? */ 1769 if (unlikely(prthdr->it_version)) 1770 goto fail; /* only version 0 is supported */ 1771 1772 /* then there must be a radiotap header with a length we can use */ 1773 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1774 1775 /* does the skb contain enough to deliver on the alleged length? */ 1776 if (unlikely(skb->len < len_rthdr)) 1777 goto fail; /* skb too short for claimed rt header extent */ 1778 1779 /* 1780 * fix up the pointers accounting for the radiotap 1781 * header still being in there. We are being given 1782 * a precooked IEEE80211 header so no need for 1783 * normal processing 1784 */ 1785 skb_set_mac_header(skb, len_rthdr); 1786 /* 1787 * these are just fixed to the end of the rt area since we 1788 * don't have any better information and at this point, nobody cares 1789 */ 1790 skb_set_network_header(skb, len_rthdr); 1791 skb_set_transport_header(skb, len_rthdr); 1792 1793 if (skb->len < len_rthdr + 2) 1794 goto fail; 1795 1796 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1797 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1798 1799 if (skb->len < len_rthdr + hdrlen) 1800 goto fail; 1801 1802 /* 1803 * Initialize skb->protocol if the injected frame is a data frame 1804 * carrying a rfc1042 header 1805 */ 1806 if (ieee80211_is_data(hdr->frame_control) && 1807 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1808 u8 *payload = (u8 *)hdr + hdrlen; 1809 1810 if (ether_addr_equal(payload, rfc1042_header)) 1811 skb->protocol = cpu_to_be16((payload[6] << 8) | 1812 payload[7]); 1813 } 1814 1815 memset(info, 0, sizeof(*info)); 1816 1817 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1818 IEEE80211_TX_CTL_INJECTED; 1819 1820 /* process and remove the injection radiotap header */ 1821 if (!ieee80211_parse_tx_radiotap(skb)) 1822 goto fail; 1823 1824 rcu_read_lock(); 1825 1826 /* 1827 * We process outgoing injected frames that have a local address 1828 * we handle as though they are non-injected frames. 1829 * This code here isn't entirely correct, the local MAC address 1830 * isn't always enough to find the interface to use; for proper 1831 * VLAN/WDS support we will need a different mechanism (which 1832 * likely isn't going to be monitor interfaces). 1833 */ 1834 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1835 1836 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1837 if (!ieee80211_sdata_running(tmp_sdata)) 1838 continue; 1839 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1840 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1841 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1842 continue; 1843 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1844 sdata = tmp_sdata; 1845 break; 1846 } 1847 } 1848 1849 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1850 if (!chanctx_conf) { 1851 tmp_sdata = rcu_dereference(local->monitor_sdata); 1852 if (tmp_sdata) 1853 chanctx_conf = 1854 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1855 } 1856 1857 if (chanctx_conf) 1858 chandef = &chanctx_conf->def; 1859 else if (!local->use_chanctx) 1860 chandef = &local->_oper_chandef; 1861 else 1862 goto fail_rcu; 1863 1864 /* 1865 * Frame injection is not allowed if beaconing is not allowed 1866 * or if we need radar detection. Beaconing is usually not allowed when 1867 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1868 * Passive scan is also used in world regulatory domains where 1869 * your country is not known and as such it should be treated as 1870 * NO TX unless the channel is explicitly allowed in which case 1871 * your current regulatory domain would not have the passive scan 1872 * flag. 1873 * 1874 * Since AP mode uses monitor interfaces to inject/TX management 1875 * frames we can make AP mode the exception to this rule once it 1876 * supports radar detection as its implementation can deal with 1877 * radar detection by itself. We can do that later by adding a 1878 * monitor flag interfaces used for AP support. 1879 */ 1880 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1881 sdata->vif.type)) 1882 goto fail_rcu; 1883 1884 info->band = chandef->chan->band; 1885 ieee80211_xmit(sdata, NULL, skb); 1886 rcu_read_unlock(); 1887 1888 return NETDEV_TX_OK; 1889 1890 fail_rcu: 1891 rcu_read_unlock(); 1892 fail: 1893 dev_kfree_skb(skb); 1894 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1895 } 1896 1897 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 1898 { 1899 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 1900 1901 return ethertype == ETH_P_TDLS && 1902 skb->len > 14 && 1903 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1904 } 1905 1906 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 1907 struct sk_buff *skb, 1908 struct sta_info **sta_out) 1909 { 1910 struct sta_info *sta; 1911 1912 switch (sdata->vif.type) { 1913 case NL80211_IFTYPE_AP_VLAN: 1914 sta = rcu_dereference(sdata->u.vlan.sta); 1915 if (sta) { 1916 *sta_out = sta; 1917 return 0; 1918 } else if (sdata->wdev.use_4addr) { 1919 return -ENOLINK; 1920 } 1921 /* fall through */ 1922 case NL80211_IFTYPE_AP: 1923 case NL80211_IFTYPE_OCB: 1924 case NL80211_IFTYPE_ADHOC: 1925 if (is_multicast_ether_addr(skb->data)) { 1926 *sta_out = ERR_PTR(-ENOENT); 1927 return 0; 1928 } 1929 sta = sta_info_get_bss(sdata, skb->data); 1930 break; 1931 case NL80211_IFTYPE_WDS: 1932 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 1933 break; 1934 #ifdef CONFIG_MAC80211_MESH 1935 case NL80211_IFTYPE_MESH_POINT: 1936 /* determined much later */ 1937 *sta_out = NULL; 1938 return 0; 1939 #endif 1940 case NL80211_IFTYPE_STATION: 1941 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1942 sta = sta_info_get(sdata, skb->data); 1943 if (sta) { 1944 bool tdls_peer, tdls_auth; 1945 1946 tdls_peer = test_sta_flag(sta, 1947 WLAN_STA_TDLS_PEER); 1948 tdls_auth = test_sta_flag(sta, 1949 WLAN_STA_TDLS_PEER_AUTH); 1950 1951 if (tdls_peer && tdls_auth) { 1952 *sta_out = sta; 1953 return 0; 1954 } 1955 1956 /* 1957 * TDLS link during setup - throw out frames to 1958 * peer. Allow TDLS-setup frames to unauthorized 1959 * peers for the special case of a link teardown 1960 * after a TDLS sta is removed due to being 1961 * unreachable. 1962 */ 1963 if (tdls_peer && !tdls_auth && 1964 !ieee80211_is_tdls_setup(skb)) 1965 return -EINVAL; 1966 } 1967 1968 } 1969 1970 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 1971 if (!sta) 1972 return -ENOLINK; 1973 break; 1974 default: 1975 return -EINVAL; 1976 } 1977 1978 *sta_out = sta ?: ERR_PTR(-ENOENT); 1979 return 0; 1980 } 1981 1982 /** 1983 * ieee80211_build_hdr - build 802.11 header in the given frame 1984 * @sdata: virtual interface to build the header for 1985 * @skb: the skb to build the header in 1986 * @info_flags: skb flags to set 1987 * 1988 * This function takes the skb with 802.3 header and reformats the header to 1989 * the appropriate IEEE 802.11 header based on which interface the packet is 1990 * being transmitted on. 1991 * 1992 * Note that this function also takes care of the TX status request and 1993 * potential unsharing of the SKB - this needs to be interleaved with the 1994 * header building. 1995 * 1996 * The function requires the read-side RCU lock held 1997 * 1998 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 1999 */ 2000 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2001 struct sk_buff *skb, u32 info_flags, 2002 struct sta_info *sta) 2003 { 2004 struct ieee80211_local *local = sdata->local; 2005 struct ieee80211_tx_info *info; 2006 int head_need; 2007 u16 ethertype, hdrlen, meshhdrlen = 0; 2008 __le16 fc; 2009 struct ieee80211_hdr hdr; 2010 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2011 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2012 const u8 *encaps_data; 2013 int encaps_len, skip_header_bytes; 2014 int nh_pos, h_pos; 2015 bool wme_sta = false, authorized = false; 2016 bool tdls_peer; 2017 bool multicast; 2018 u16 info_id = 0; 2019 struct ieee80211_chanctx_conf *chanctx_conf; 2020 struct ieee80211_sub_if_data *ap_sdata; 2021 enum ieee80211_band band; 2022 int ret; 2023 2024 if (IS_ERR(sta)) 2025 sta = NULL; 2026 2027 /* convert Ethernet header to proper 802.11 header (based on 2028 * operation mode) */ 2029 ethertype = (skb->data[12] << 8) | skb->data[13]; 2030 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2031 2032 switch (sdata->vif.type) { 2033 case NL80211_IFTYPE_AP_VLAN: 2034 if (sdata->wdev.use_4addr) { 2035 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2036 /* RA TA DA SA */ 2037 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2038 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2039 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2040 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2041 hdrlen = 30; 2042 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2043 wme_sta = sta->sta.wme; 2044 } 2045 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2046 u.ap); 2047 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2048 if (!chanctx_conf) { 2049 ret = -ENOTCONN; 2050 goto free; 2051 } 2052 band = chanctx_conf->def.chan->band; 2053 if (sdata->wdev.use_4addr) 2054 break; 2055 /* fall through */ 2056 case NL80211_IFTYPE_AP: 2057 if (sdata->vif.type == NL80211_IFTYPE_AP) 2058 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2059 if (!chanctx_conf) { 2060 ret = -ENOTCONN; 2061 goto free; 2062 } 2063 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2064 /* DA BSSID SA */ 2065 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2066 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2067 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2068 hdrlen = 24; 2069 band = chanctx_conf->def.chan->band; 2070 break; 2071 case NL80211_IFTYPE_WDS: 2072 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2073 /* RA TA DA SA */ 2074 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2075 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2076 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2077 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2078 hdrlen = 30; 2079 /* 2080 * This is the exception! WDS style interfaces are prohibited 2081 * when channel contexts are in used so this must be valid 2082 */ 2083 band = local->hw.conf.chandef.chan->band; 2084 break; 2085 #ifdef CONFIG_MAC80211_MESH 2086 case NL80211_IFTYPE_MESH_POINT: 2087 if (!is_multicast_ether_addr(skb->data)) { 2088 struct sta_info *next_hop; 2089 bool mpp_lookup = true; 2090 2091 mpath = mesh_path_lookup(sdata, skb->data); 2092 if (mpath) { 2093 mpp_lookup = false; 2094 next_hop = rcu_dereference(mpath->next_hop); 2095 if (!next_hop || 2096 !(mpath->flags & (MESH_PATH_ACTIVE | 2097 MESH_PATH_RESOLVING))) 2098 mpp_lookup = true; 2099 } 2100 2101 if (mpp_lookup) 2102 mppath = mpp_path_lookup(sdata, skb->data); 2103 2104 if (mppath && mpath) 2105 mesh_path_del(mpath->sdata, mpath->dst); 2106 } 2107 2108 /* 2109 * Use address extension if it is a packet from 2110 * another interface or if we know the destination 2111 * is being proxied by a portal (i.e. portal address 2112 * differs from proxied address) 2113 */ 2114 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2115 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2116 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2117 skb->data, skb->data + ETH_ALEN); 2118 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2119 NULL, NULL); 2120 } else { 2121 /* DS -> MBSS (802.11-2012 13.11.3.3). 2122 * For unicast with unknown forwarding information, 2123 * destination might be in the MBSS or if that fails 2124 * forwarded to another mesh gate. In either case 2125 * resolution will be handled in ieee80211_xmit(), so 2126 * leave the original DA. This also works for mcast */ 2127 const u8 *mesh_da = skb->data; 2128 2129 if (mppath) 2130 mesh_da = mppath->mpp; 2131 else if (mpath) 2132 mesh_da = mpath->dst; 2133 2134 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2135 mesh_da, sdata->vif.addr); 2136 if (is_multicast_ether_addr(mesh_da)) 2137 /* DA TA mSA AE:SA */ 2138 meshhdrlen = ieee80211_new_mesh_header( 2139 sdata, &mesh_hdr, 2140 skb->data + ETH_ALEN, NULL); 2141 else 2142 /* RA TA mDA mSA AE:DA SA */ 2143 meshhdrlen = ieee80211_new_mesh_header( 2144 sdata, &mesh_hdr, skb->data, 2145 skb->data + ETH_ALEN); 2146 2147 } 2148 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2149 if (!chanctx_conf) { 2150 ret = -ENOTCONN; 2151 goto free; 2152 } 2153 band = chanctx_conf->def.chan->band; 2154 break; 2155 #endif 2156 case NL80211_IFTYPE_STATION: 2157 /* we already did checks when looking up the RA STA */ 2158 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2159 2160 if (tdls_peer) { 2161 /* DA SA BSSID */ 2162 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2163 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2164 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2165 hdrlen = 24; 2166 } else if (sdata->u.mgd.use_4addr && 2167 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2168 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2169 IEEE80211_FCTL_TODS); 2170 /* RA TA DA SA */ 2171 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2172 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2173 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2174 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2175 hdrlen = 30; 2176 } else { 2177 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2178 /* BSSID SA DA */ 2179 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2180 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2181 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2182 hdrlen = 24; 2183 } 2184 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2185 if (!chanctx_conf) { 2186 ret = -ENOTCONN; 2187 goto free; 2188 } 2189 band = chanctx_conf->def.chan->band; 2190 break; 2191 case NL80211_IFTYPE_OCB: 2192 /* DA SA BSSID */ 2193 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2194 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2195 eth_broadcast_addr(hdr.addr3); 2196 hdrlen = 24; 2197 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2198 if (!chanctx_conf) { 2199 ret = -ENOTCONN; 2200 goto free; 2201 } 2202 band = chanctx_conf->def.chan->band; 2203 break; 2204 case NL80211_IFTYPE_ADHOC: 2205 /* DA SA BSSID */ 2206 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2207 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2208 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2209 hdrlen = 24; 2210 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2211 if (!chanctx_conf) { 2212 ret = -ENOTCONN; 2213 goto free; 2214 } 2215 band = chanctx_conf->def.chan->band; 2216 break; 2217 default: 2218 ret = -EINVAL; 2219 goto free; 2220 } 2221 2222 multicast = is_multicast_ether_addr(hdr.addr1); 2223 2224 /* sta is always NULL for mesh */ 2225 if (sta) { 2226 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2227 wme_sta = sta->sta.wme; 2228 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2229 /* For mesh, the use of the QoS header is mandatory */ 2230 wme_sta = true; 2231 } 2232 2233 /* receiver does QoS (which also means we do) use it */ 2234 if (wme_sta) { 2235 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2236 hdrlen += 2; 2237 } 2238 2239 /* 2240 * Drop unicast frames to unauthorised stations unless they are 2241 * EAPOL frames from the local station. 2242 */ 2243 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2244 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2245 !multicast && !authorized && 2246 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2247 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2248 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2249 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2250 sdata->name, hdr.addr1); 2251 #endif 2252 2253 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2254 2255 ret = -EPERM; 2256 goto free; 2257 } 2258 2259 if (unlikely(!multicast && skb->sk && 2260 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2261 struct sk_buff *ack_skb = skb_clone_sk(skb); 2262 2263 if (ack_skb) { 2264 unsigned long flags; 2265 int id; 2266 2267 spin_lock_irqsave(&local->ack_status_lock, flags); 2268 id = idr_alloc(&local->ack_status_frames, ack_skb, 2269 1, 0x10000, GFP_ATOMIC); 2270 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2271 2272 if (id >= 0) { 2273 info_id = id; 2274 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2275 } else { 2276 kfree_skb(ack_skb); 2277 } 2278 } 2279 } 2280 2281 /* 2282 * If the skb is shared we need to obtain our own copy. 2283 */ 2284 if (skb_shared(skb)) { 2285 struct sk_buff *tmp_skb = skb; 2286 2287 /* can't happen -- skb is a clone if info_id != 0 */ 2288 WARN_ON(info_id); 2289 2290 skb = skb_clone(skb, GFP_ATOMIC); 2291 kfree_skb(tmp_skb); 2292 2293 if (!skb) { 2294 ret = -ENOMEM; 2295 goto free; 2296 } 2297 } 2298 2299 hdr.frame_control = fc; 2300 hdr.duration_id = 0; 2301 hdr.seq_ctrl = 0; 2302 2303 skip_header_bytes = ETH_HLEN; 2304 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2305 encaps_data = bridge_tunnel_header; 2306 encaps_len = sizeof(bridge_tunnel_header); 2307 skip_header_bytes -= 2; 2308 } else if (ethertype >= ETH_P_802_3_MIN) { 2309 encaps_data = rfc1042_header; 2310 encaps_len = sizeof(rfc1042_header); 2311 skip_header_bytes -= 2; 2312 } else { 2313 encaps_data = NULL; 2314 encaps_len = 0; 2315 } 2316 2317 nh_pos = skb_network_header(skb) - skb->data; 2318 h_pos = skb_transport_header(skb) - skb->data; 2319 2320 skb_pull(skb, skip_header_bytes); 2321 nh_pos -= skip_header_bytes; 2322 h_pos -= skip_header_bytes; 2323 2324 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2325 2326 /* 2327 * So we need to modify the skb header and hence need a copy of 2328 * that. The head_need variable above doesn't, so far, include 2329 * the needed header space that we don't need right away. If we 2330 * can, then we don't reallocate right now but only after the 2331 * frame arrives at the master device (if it does...) 2332 * 2333 * If we cannot, however, then we will reallocate to include all 2334 * the ever needed space. Also, if we need to reallocate it anyway, 2335 * make it big enough for everything we may ever need. 2336 */ 2337 2338 if (head_need > 0 || skb_cloned(skb)) { 2339 head_need += sdata->encrypt_headroom; 2340 head_need += local->tx_headroom; 2341 head_need = max_t(int, 0, head_need); 2342 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2343 ieee80211_free_txskb(&local->hw, skb); 2344 skb = NULL; 2345 return ERR_PTR(-ENOMEM); 2346 } 2347 } 2348 2349 if (encaps_data) { 2350 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2351 nh_pos += encaps_len; 2352 h_pos += encaps_len; 2353 } 2354 2355 #ifdef CONFIG_MAC80211_MESH 2356 if (meshhdrlen > 0) { 2357 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2358 nh_pos += meshhdrlen; 2359 h_pos += meshhdrlen; 2360 } 2361 #endif 2362 2363 if (ieee80211_is_data_qos(fc)) { 2364 __le16 *qos_control; 2365 2366 qos_control = (__le16 *) skb_push(skb, 2); 2367 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2368 /* 2369 * Maybe we could actually set some fields here, for now just 2370 * initialise to zero to indicate no special operation. 2371 */ 2372 *qos_control = 0; 2373 } else 2374 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2375 2376 nh_pos += hdrlen; 2377 h_pos += hdrlen; 2378 2379 /* Update skb pointers to various headers since this modified frame 2380 * is going to go through Linux networking code that may potentially 2381 * need things like pointer to IP header. */ 2382 skb_set_mac_header(skb, 0); 2383 skb_set_network_header(skb, nh_pos); 2384 skb_set_transport_header(skb, h_pos); 2385 2386 info = IEEE80211_SKB_CB(skb); 2387 memset(info, 0, sizeof(*info)); 2388 2389 info->flags = info_flags; 2390 info->ack_frame_id = info_id; 2391 info->band = band; 2392 2393 return skb; 2394 free: 2395 kfree_skb(skb); 2396 return ERR_PTR(ret); 2397 } 2398 2399 /* 2400 * fast-xmit overview 2401 * 2402 * The core idea of this fast-xmit is to remove per-packet checks by checking 2403 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2404 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2405 * much less work can be done per packet. For example, fragmentation must be 2406 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2407 * in the code here. 2408 * 2409 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2410 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2411 * 2412 * The most difficult part of this is that when any of these assumptions 2413 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2414 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2415 * since the per-packet code no longer checks the conditions. This is reflected 2416 * by the calls to these functions throughout the rest of the code, and must be 2417 * maintained if any of the TX path checks change. 2418 */ 2419 2420 void ieee80211_check_fast_xmit(struct sta_info *sta) 2421 { 2422 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2423 struct ieee80211_local *local = sta->local; 2424 struct ieee80211_sub_if_data *sdata = sta->sdata; 2425 struct ieee80211_hdr *hdr = (void *)build.hdr; 2426 struct ieee80211_chanctx_conf *chanctx_conf; 2427 __le16 fc; 2428 2429 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2430 return; 2431 2432 /* Locking here protects both the pointer itself, and against concurrent 2433 * invocations winning data access races to, e.g., the key pointer that 2434 * is used. 2435 * Without it, the invocation of this function right after the key 2436 * pointer changes wouldn't be sufficient, as another CPU could access 2437 * the pointer, then stall, and then do the cache update after the CPU 2438 * that invalidated the key. 2439 * With the locking, such scenarios cannot happen as the check for the 2440 * key and the fast-tx assignment are done atomically, so the CPU that 2441 * modifies the key will either wait or other one will see the key 2442 * cleared/changed already. 2443 */ 2444 spin_lock_bh(&sta->lock); 2445 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2446 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2447 sdata->vif.type == NL80211_IFTYPE_STATION) 2448 goto out; 2449 2450 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2451 goto out; 2452 2453 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2454 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2455 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) 2456 goto out; 2457 2458 if (sdata->noack_map) 2459 goto out; 2460 2461 /* fast-xmit doesn't handle fragmentation at all */ 2462 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2463 !local->ops->set_frag_threshold) 2464 goto out; 2465 2466 rcu_read_lock(); 2467 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2468 if (!chanctx_conf) { 2469 rcu_read_unlock(); 2470 goto out; 2471 } 2472 build.band = chanctx_conf->def.chan->band; 2473 rcu_read_unlock(); 2474 2475 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2476 2477 switch (sdata->vif.type) { 2478 case NL80211_IFTYPE_ADHOC: 2479 /* DA SA BSSID */ 2480 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2481 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2482 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2483 build.hdr_len = 24; 2484 break; 2485 case NL80211_IFTYPE_STATION: 2486 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2487 /* DA SA BSSID */ 2488 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2489 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2490 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2491 build.hdr_len = 24; 2492 break; 2493 } 2494 2495 if (sdata->u.mgd.use_4addr) { 2496 /* non-regular ethertype cannot use the fastpath */ 2497 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2498 IEEE80211_FCTL_TODS); 2499 /* RA TA DA SA */ 2500 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2501 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2502 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2503 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2504 build.hdr_len = 30; 2505 break; 2506 } 2507 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2508 /* BSSID SA DA */ 2509 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2510 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2511 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2512 build.hdr_len = 24; 2513 break; 2514 case NL80211_IFTYPE_AP_VLAN: 2515 if (sdata->wdev.use_4addr) { 2516 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2517 IEEE80211_FCTL_TODS); 2518 /* RA TA DA SA */ 2519 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2520 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2521 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2522 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2523 build.hdr_len = 30; 2524 break; 2525 } 2526 /* fall through */ 2527 case NL80211_IFTYPE_AP: 2528 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2529 /* DA BSSID SA */ 2530 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2531 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2532 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2533 build.hdr_len = 24; 2534 break; 2535 default: 2536 /* not handled on fast-xmit */ 2537 goto out; 2538 } 2539 2540 if (sta->sta.wme) { 2541 build.hdr_len += 2; 2542 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2543 } 2544 2545 /* We store the key here so there's no point in using rcu_dereference() 2546 * but that's fine because the code that changes the pointers will call 2547 * this function after doing so. For a single CPU that would be enough, 2548 * for multiple see the comment above. 2549 */ 2550 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2551 if (!build.key) 2552 build.key = rcu_access_pointer(sdata->default_unicast_key); 2553 if (build.key) { 2554 bool gen_iv, iv_spc, mmic; 2555 2556 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2557 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2558 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2559 2560 /* don't handle software crypto */ 2561 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2562 goto out; 2563 2564 switch (build.key->conf.cipher) { 2565 case WLAN_CIPHER_SUITE_CCMP: 2566 case WLAN_CIPHER_SUITE_CCMP_256: 2567 /* add fixed key ID */ 2568 if (gen_iv) { 2569 (build.hdr + build.hdr_len)[3] = 2570 0x20 | (build.key->conf.keyidx << 6); 2571 build.pn_offs = build.hdr_len; 2572 } 2573 if (gen_iv || iv_spc) 2574 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2575 break; 2576 case WLAN_CIPHER_SUITE_GCMP: 2577 case WLAN_CIPHER_SUITE_GCMP_256: 2578 /* add fixed key ID */ 2579 if (gen_iv) { 2580 (build.hdr + build.hdr_len)[3] = 2581 0x20 | (build.key->conf.keyidx << 6); 2582 build.pn_offs = build.hdr_len; 2583 } 2584 if (gen_iv || iv_spc) 2585 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2586 break; 2587 case WLAN_CIPHER_SUITE_TKIP: 2588 /* cannot handle MMIC or IV generation in xmit-fast */ 2589 if (mmic || gen_iv) 2590 goto out; 2591 if (iv_spc) 2592 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2593 break; 2594 case WLAN_CIPHER_SUITE_WEP40: 2595 case WLAN_CIPHER_SUITE_WEP104: 2596 /* cannot handle IV generation in fast-xmit */ 2597 if (gen_iv) 2598 goto out; 2599 if (iv_spc) 2600 build.hdr_len += IEEE80211_WEP_IV_LEN; 2601 break; 2602 case WLAN_CIPHER_SUITE_AES_CMAC: 2603 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2604 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2605 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2606 WARN(1, 2607 "management cipher suite 0x%x enabled for data\n", 2608 build.key->conf.cipher); 2609 goto out; 2610 default: 2611 /* we don't know how to generate IVs for this at all */ 2612 if (WARN_ON(gen_iv)) 2613 goto out; 2614 /* pure hardware keys are OK, of course */ 2615 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2616 break; 2617 /* cipher scheme might require space allocation */ 2618 if (iv_spc && 2619 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2620 goto out; 2621 if (iv_spc) 2622 build.hdr_len += build.key->conf.iv_len; 2623 } 2624 2625 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2626 } 2627 2628 hdr->frame_control = fc; 2629 2630 memcpy(build.hdr + build.hdr_len, 2631 rfc1042_header, sizeof(rfc1042_header)); 2632 build.hdr_len += sizeof(rfc1042_header); 2633 2634 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2635 /* if the kmemdup fails, continue w/o fast_tx */ 2636 if (!fast_tx) 2637 goto out; 2638 2639 out: 2640 /* we might have raced against another call to this function */ 2641 old = rcu_dereference_protected(sta->fast_tx, 2642 lockdep_is_held(&sta->lock)); 2643 rcu_assign_pointer(sta->fast_tx, fast_tx); 2644 if (old) 2645 kfree_rcu(old, rcu_head); 2646 spin_unlock_bh(&sta->lock); 2647 } 2648 2649 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2650 { 2651 struct sta_info *sta; 2652 2653 rcu_read_lock(); 2654 list_for_each_entry_rcu(sta, &local->sta_list, list) 2655 ieee80211_check_fast_xmit(sta); 2656 rcu_read_unlock(); 2657 } 2658 2659 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2660 { 2661 struct ieee80211_local *local = sdata->local; 2662 struct sta_info *sta; 2663 2664 rcu_read_lock(); 2665 2666 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2667 if (sdata != sta->sdata && 2668 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2669 continue; 2670 ieee80211_check_fast_xmit(sta); 2671 } 2672 2673 rcu_read_unlock(); 2674 } 2675 2676 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2677 { 2678 struct ieee80211_fast_tx *fast_tx; 2679 2680 spin_lock_bh(&sta->lock); 2681 fast_tx = rcu_dereference_protected(sta->fast_tx, 2682 lockdep_is_held(&sta->lock)); 2683 RCU_INIT_POINTER(sta->fast_tx, NULL); 2684 spin_unlock_bh(&sta->lock); 2685 2686 if (fast_tx) 2687 kfree_rcu(fast_tx, rcu_head); 2688 } 2689 2690 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2691 struct net_device *dev, struct sta_info *sta, 2692 struct ieee80211_fast_tx *fast_tx, 2693 struct sk_buff *skb) 2694 { 2695 struct ieee80211_local *local = sdata->local; 2696 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2697 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2698 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2699 struct ethhdr eth; 2700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2701 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2702 struct ieee80211_tx_data tx; 2703 ieee80211_tx_result r; 2704 struct tid_ampdu_tx *tid_tx = NULL; 2705 u8 tid = IEEE80211_NUM_TIDS; 2706 2707 /* control port protocol needs a lot of special handling */ 2708 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2709 return false; 2710 2711 /* only RFC 1042 SNAP */ 2712 if (ethertype < ETH_P_802_3_MIN) 2713 return false; 2714 2715 /* don't handle TX status request here either */ 2716 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2717 return false; 2718 2719 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2720 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2721 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2722 if (tid_tx) { 2723 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2724 return false; 2725 if (tid_tx->timeout) 2726 tid_tx->last_tx = jiffies; 2727 } 2728 } 2729 2730 /* after this point (skb is modified) we cannot return false */ 2731 2732 if (skb_shared(skb)) { 2733 struct sk_buff *tmp_skb = skb; 2734 2735 skb = skb_clone(skb, GFP_ATOMIC); 2736 kfree_skb(tmp_skb); 2737 2738 if (!skb) 2739 return true; 2740 } 2741 2742 ieee80211_tx_stats(dev, skb->len + extra_head); 2743 2744 /* will not be crypto-handled beyond what we do here, so use false 2745 * as the may-encrypt argument for the resize to not account for 2746 * more room than we already have in 'extra_head' 2747 */ 2748 if (unlikely(ieee80211_skb_resize(sdata, skb, 2749 max_t(int, extra_head + hw_headroom - 2750 skb_headroom(skb), 0), 2751 false))) { 2752 kfree_skb(skb); 2753 return true; 2754 } 2755 2756 memcpy(ð, skb->data, ETH_HLEN - 2); 2757 hdr = (void *)skb_push(skb, extra_head); 2758 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 2759 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 2760 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 2761 2762 memset(info, 0, sizeof(*info)); 2763 info->band = fast_tx->band; 2764 info->control.vif = &sdata->vif; 2765 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 2766 IEEE80211_TX_CTL_DONTFRAG | 2767 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 2768 2769 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2770 *ieee80211_get_qos_ctl(hdr) = tid; 2771 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 2772 } else { 2773 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2774 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 2775 sdata->sequence_number += 0x10; 2776 } 2777 2778 sta->tx_msdu[tid]++; 2779 2780 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2781 2782 __skb_queue_head_init(&tx.skbs); 2783 2784 tx.flags = IEEE80211_TX_UNICAST; 2785 tx.local = local; 2786 tx.sdata = sdata; 2787 tx.sta = sta; 2788 tx.key = fast_tx->key; 2789 2790 if (fast_tx->key) 2791 info->control.hw_key = &fast_tx->key->conf; 2792 2793 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 2794 tx.skb = skb; 2795 r = ieee80211_tx_h_rate_ctrl(&tx); 2796 skb = tx.skb; 2797 tx.skb = NULL; 2798 2799 if (r != TX_CONTINUE) { 2800 if (r != TX_QUEUED) 2801 kfree_skb(skb); 2802 return true; 2803 } 2804 } 2805 2806 /* statistics normally done by ieee80211_tx_h_stats (but that 2807 * has to consider fragmentation, so is more complex) 2808 */ 2809 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len; 2810 sta->tx_packets[skb_get_queue_mapping(skb)]++; 2811 2812 if (fast_tx->pn_offs) { 2813 u64 pn; 2814 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 2815 2816 switch (fast_tx->key->conf.cipher) { 2817 case WLAN_CIPHER_SUITE_CCMP: 2818 case WLAN_CIPHER_SUITE_CCMP_256: 2819 case WLAN_CIPHER_SUITE_GCMP: 2820 case WLAN_CIPHER_SUITE_GCMP_256: 2821 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 2822 crypto_hdr[0] = pn; 2823 crypto_hdr[1] = pn >> 8; 2824 crypto_hdr[4] = pn >> 16; 2825 crypto_hdr[5] = pn >> 24; 2826 crypto_hdr[6] = pn >> 32; 2827 crypto_hdr[7] = pn >> 40; 2828 break; 2829 } 2830 } 2831 2832 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2833 sdata = container_of(sdata->bss, 2834 struct ieee80211_sub_if_data, u.ap); 2835 2836 __skb_queue_tail(&tx.skbs, skb); 2837 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 2838 return true; 2839 } 2840 2841 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 2842 struct net_device *dev, 2843 u32 info_flags) 2844 { 2845 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2846 struct sta_info *sta; 2847 struct sk_buff *next; 2848 2849 if (unlikely(skb->len < ETH_HLEN)) { 2850 kfree_skb(skb); 2851 return; 2852 } 2853 2854 rcu_read_lock(); 2855 2856 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 2857 goto out_free; 2858 2859 if (!IS_ERR_OR_NULL(sta)) { 2860 struct ieee80211_fast_tx *fast_tx; 2861 2862 fast_tx = rcu_dereference(sta->fast_tx); 2863 2864 if (fast_tx && 2865 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 2866 goto out; 2867 } 2868 2869 if (skb_is_gso(skb)) { 2870 struct sk_buff *segs; 2871 2872 segs = skb_gso_segment(skb, 0); 2873 if (IS_ERR(segs)) { 2874 goto out_free; 2875 } else if (segs) { 2876 consume_skb(skb); 2877 skb = segs; 2878 } 2879 } else { 2880 /* we cannot process non-linear frames on this path */ 2881 if (skb_linearize(skb)) { 2882 kfree_skb(skb); 2883 goto out; 2884 } 2885 2886 /* the frame could be fragmented, software-encrypted, and other 2887 * things so we cannot really handle checksum offload with it - 2888 * fix it up in software before we handle anything else. 2889 */ 2890 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2891 skb_set_transport_header(skb, 2892 skb_checksum_start_offset(skb)); 2893 if (skb_checksum_help(skb)) 2894 goto out_free; 2895 } 2896 } 2897 2898 next = skb; 2899 while (next) { 2900 skb = next; 2901 next = skb->next; 2902 2903 skb->prev = NULL; 2904 skb->next = NULL; 2905 2906 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2907 if (IS_ERR(skb)) 2908 goto out; 2909 2910 ieee80211_tx_stats(dev, skb->len); 2911 2912 ieee80211_xmit(sdata, sta, skb); 2913 } 2914 goto out; 2915 out_free: 2916 kfree_skb(skb); 2917 out: 2918 rcu_read_unlock(); 2919 } 2920 2921 /** 2922 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 2923 * @skb: packet to be sent 2924 * @dev: incoming interface 2925 * 2926 * On failure skb will be freed. 2927 */ 2928 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 2929 struct net_device *dev) 2930 { 2931 __ieee80211_subif_start_xmit(skb, dev, 0); 2932 return NETDEV_TX_OK; 2933 } 2934 2935 struct sk_buff * 2936 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 2937 struct sk_buff *skb, u32 info_flags) 2938 { 2939 struct ieee80211_hdr *hdr; 2940 struct ieee80211_tx_data tx = { 2941 .local = sdata->local, 2942 .sdata = sdata, 2943 }; 2944 struct sta_info *sta; 2945 2946 rcu_read_lock(); 2947 2948 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 2949 kfree_skb(skb); 2950 skb = ERR_PTR(-EINVAL); 2951 goto out; 2952 } 2953 2954 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2955 if (IS_ERR(skb)) 2956 goto out; 2957 2958 hdr = (void *)skb->data; 2959 tx.sta = sta_info_get(sdata, hdr->addr1); 2960 tx.skb = skb; 2961 2962 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 2963 rcu_read_unlock(); 2964 kfree_skb(skb); 2965 return ERR_PTR(-EINVAL); 2966 } 2967 2968 out: 2969 rcu_read_unlock(); 2970 return skb; 2971 } 2972 2973 /* 2974 * ieee80211_clear_tx_pending may not be called in a context where 2975 * it is possible that it packets could come in again. 2976 */ 2977 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2978 { 2979 struct sk_buff *skb; 2980 int i; 2981 2982 for (i = 0; i < local->hw.queues; i++) { 2983 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2984 ieee80211_free_txskb(&local->hw, skb); 2985 } 2986 } 2987 2988 /* 2989 * Returns false if the frame couldn't be transmitted but was queued instead, 2990 * which in this case means re-queued -- take as an indication to stop sending 2991 * more pending frames. 2992 */ 2993 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2994 struct sk_buff *skb) 2995 { 2996 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2997 struct ieee80211_sub_if_data *sdata; 2998 struct sta_info *sta; 2999 struct ieee80211_hdr *hdr; 3000 bool result; 3001 struct ieee80211_chanctx_conf *chanctx_conf; 3002 3003 sdata = vif_to_sdata(info->control.vif); 3004 3005 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3006 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3007 if (unlikely(!chanctx_conf)) { 3008 dev_kfree_skb(skb); 3009 return true; 3010 } 3011 info->band = chanctx_conf->def.chan->band; 3012 result = ieee80211_tx(sdata, NULL, skb, true); 3013 } else { 3014 struct sk_buff_head skbs; 3015 3016 __skb_queue_head_init(&skbs); 3017 __skb_queue_tail(&skbs, skb); 3018 3019 hdr = (struct ieee80211_hdr *)skb->data; 3020 sta = sta_info_get(sdata, hdr->addr1); 3021 3022 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3023 } 3024 3025 return result; 3026 } 3027 3028 /* 3029 * Transmit all pending packets. Called from tasklet. 3030 */ 3031 void ieee80211_tx_pending(unsigned long data) 3032 { 3033 struct ieee80211_local *local = (struct ieee80211_local *)data; 3034 unsigned long flags; 3035 int i; 3036 bool txok; 3037 3038 rcu_read_lock(); 3039 3040 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3041 for (i = 0; i < local->hw.queues; i++) { 3042 /* 3043 * If queue is stopped by something other than due to pending 3044 * frames, or we have no pending frames, proceed to next queue. 3045 */ 3046 if (local->queue_stop_reasons[i] || 3047 skb_queue_empty(&local->pending[i])) 3048 continue; 3049 3050 while (!skb_queue_empty(&local->pending[i])) { 3051 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3052 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3053 3054 if (WARN_ON(!info->control.vif)) { 3055 ieee80211_free_txskb(&local->hw, skb); 3056 continue; 3057 } 3058 3059 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3060 flags); 3061 3062 txok = ieee80211_tx_pending_skb(local, skb); 3063 spin_lock_irqsave(&local->queue_stop_reason_lock, 3064 flags); 3065 if (!txok) 3066 break; 3067 } 3068 3069 if (skb_queue_empty(&local->pending[i])) 3070 ieee80211_propagate_queue_wake(local, i); 3071 } 3072 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3073 3074 rcu_read_unlock(); 3075 } 3076 3077 /* functions for drivers to get certain frames */ 3078 3079 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3080 struct ps_data *ps, struct sk_buff *skb, 3081 bool is_template) 3082 { 3083 u8 *pos, *tim; 3084 int aid0 = 0; 3085 int i, have_bits = 0, n1, n2; 3086 3087 /* Generate bitmap for TIM only if there are any STAs in power save 3088 * mode. */ 3089 if (atomic_read(&ps->num_sta_ps) > 0) 3090 /* in the hope that this is faster than 3091 * checking byte-for-byte */ 3092 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3093 IEEE80211_MAX_AID+1); 3094 if (!is_template) { 3095 if (ps->dtim_count == 0) 3096 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3097 else 3098 ps->dtim_count--; 3099 } 3100 3101 tim = pos = (u8 *) skb_put(skb, 6); 3102 *pos++ = WLAN_EID_TIM; 3103 *pos++ = 4; 3104 *pos++ = ps->dtim_count; 3105 *pos++ = sdata->vif.bss_conf.dtim_period; 3106 3107 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3108 aid0 = 1; 3109 3110 ps->dtim_bc_mc = aid0 == 1; 3111 3112 if (have_bits) { 3113 /* Find largest even number N1 so that bits numbered 1 through 3114 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3115 * (N2 + 1) x 8 through 2007 are 0. */ 3116 n1 = 0; 3117 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3118 if (ps->tim[i]) { 3119 n1 = i & 0xfe; 3120 break; 3121 } 3122 } 3123 n2 = n1; 3124 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3125 if (ps->tim[i]) { 3126 n2 = i; 3127 break; 3128 } 3129 } 3130 3131 /* Bitmap control */ 3132 *pos++ = n1 | aid0; 3133 /* Part Virt Bitmap */ 3134 skb_put(skb, n2 - n1); 3135 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3136 3137 tim[1] = n2 - n1 + 4; 3138 } else { 3139 *pos++ = aid0; /* Bitmap control */ 3140 *pos++ = 0; /* Part Virt Bitmap */ 3141 } 3142 } 3143 3144 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3145 struct ps_data *ps, struct sk_buff *skb, 3146 bool is_template) 3147 { 3148 struct ieee80211_local *local = sdata->local; 3149 3150 /* 3151 * Not very nice, but we want to allow the driver to call 3152 * ieee80211_beacon_get() as a response to the set_tim() 3153 * callback. That, however, is already invoked under the 3154 * sta_lock to guarantee consistent and race-free update 3155 * of the tim bitmap in mac80211 and the driver. 3156 */ 3157 if (local->tim_in_locked_section) { 3158 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3159 } else { 3160 spin_lock_bh(&local->tim_lock); 3161 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3162 spin_unlock_bh(&local->tim_lock); 3163 } 3164 3165 return 0; 3166 } 3167 3168 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3169 struct beacon_data *beacon) 3170 { 3171 struct probe_resp *resp; 3172 u8 *beacon_data; 3173 size_t beacon_data_len; 3174 int i; 3175 u8 count = beacon->csa_current_counter; 3176 3177 switch (sdata->vif.type) { 3178 case NL80211_IFTYPE_AP: 3179 beacon_data = beacon->tail; 3180 beacon_data_len = beacon->tail_len; 3181 break; 3182 case NL80211_IFTYPE_ADHOC: 3183 beacon_data = beacon->head; 3184 beacon_data_len = beacon->head_len; 3185 break; 3186 case NL80211_IFTYPE_MESH_POINT: 3187 beacon_data = beacon->head; 3188 beacon_data_len = beacon->head_len; 3189 break; 3190 default: 3191 return; 3192 } 3193 3194 rcu_read_lock(); 3195 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3196 resp = rcu_dereference(sdata->u.ap.probe_resp); 3197 3198 if (beacon->csa_counter_offsets[i]) { 3199 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3200 beacon_data_len)) { 3201 rcu_read_unlock(); 3202 return; 3203 } 3204 3205 beacon_data[beacon->csa_counter_offsets[i]] = count; 3206 } 3207 3208 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3209 resp->data[resp->csa_counter_offsets[i]] = count; 3210 } 3211 rcu_read_unlock(); 3212 } 3213 3214 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3215 { 3216 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3217 struct beacon_data *beacon = NULL; 3218 u8 count = 0; 3219 3220 rcu_read_lock(); 3221 3222 if (sdata->vif.type == NL80211_IFTYPE_AP) 3223 beacon = rcu_dereference(sdata->u.ap.beacon); 3224 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3225 beacon = rcu_dereference(sdata->u.ibss.presp); 3226 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3227 beacon = rcu_dereference(sdata->u.mesh.beacon); 3228 3229 if (!beacon) 3230 goto unlock; 3231 3232 beacon->csa_current_counter--; 3233 3234 /* the counter should never reach 0 */ 3235 WARN_ON_ONCE(!beacon->csa_current_counter); 3236 count = beacon->csa_current_counter; 3237 3238 unlock: 3239 rcu_read_unlock(); 3240 return count; 3241 } 3242 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3243 3244 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3245 { 3246 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3247 struct beacon_data *beacon = NULL; 3248 u8 *beacon_data; 3249 size_t beacon_data_len; 3250 int ret = false; 3251 3252 if (!ieee80211_sdata_running(sdata)) 3253 return false; 3254 3255 rcu_read_lock(); 3256 if (vif->type == NL80211_IFTYPE_AP) { 3257 struct ieee80211_if_ap *ap = &sdata->u.ap; 3258 3259 beacon = rcu_dereference(ap->beacon); 3260 if (WARN_ON(!beacon || !beacon->tail)) 3261 goto out; 3262 beacon_data = beacon->tail; 3263 beacon_data_len = beacon->tail_len; 3264 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3265 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3266 3267 beacon = rcu_dereference(ifibss->presp); 3268 if (!beacon) 3269 goto out; 3270 3271 beacon_data = beacon->head; 3272 beacon_data_len = beacon->head_len; 3273 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3274 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3275 3276 beacon = rcu_dereference(ifmsh->beacon); 3277 if (!beacon) 3278 goto out; 3279 3280 beacon_data = beacon->head; 3281 beacon_data_len = beacon->head_len; 3282 } else { 3283 WARN_ON(1); 3284 goto out; 3285 } 3286 3287 if (!beacon->csa_counter_offsets[0]) 3288 goto out; 3289 3290 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3291 goto out; 3292 3293 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3294 ret = true; 3295 out: 3296 rcu_read_unlock(); 3297 3298 return ret; 3299 } 3300 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3301 3302 static struct sk_buff * 3303 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3304 struct ieee80211_vif *vif, 3305 struct ieee80211_mutable_offsets *offs, 3306 bool is_template) 3307 { 3308 struct ieee80211_local *local = hw_to_local(hw); 3309 struct beacon_data *beacon = NULL; 3310 struct sk_buff *skb = NULL; 3311 struct ieee80211_tx_info *info; 3312 struct ieee80211_sub_if_data *sdata = NULL; 3313 enum ieee80211_band band; 3314 struct ieee80211_tx_rate_control txrc; 3315 struct ieee80211_chanctx_conf *chanctx_conf; 3316 int csa_off_base = 0; 3317 3318 rcu_read_lock(); 3319 3320 sdata = vif_to_sdata(vif); 3321 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3322 3323 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3324 goto out; 3325 3326 if (offs) 3327 memset(offs, 0, sizeof(*offs)); 3328 3329 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3330 struct ieee80211_if_ap *ap = &sdata->u.ap; 3331 3332 beacon = rcu_dereference(ap->beacon); 3333 if (beacon) { 3334 if (beacon->csa_counter_offsets[0]) { 3335 if (!is_template) 3336 ieee80211_csa_update_counter(vif); 3337 3338 ieee80211_set_csa(sdata, beacon); 3339 } 3340 3341 /* 3342 * headroom, head length, 3343 * tail length and maximum TIM length 3344 */ 3345 skb = dev_alloc_skb(local->tx_headroom + 3346 beacon->head_len + 3347 beacon->tail_len + 256 + 3348 local->hw.extra_beacon_tailroom); 3349 if (!skb) 3350 goto out; 3351 3352 skb_reserve(skb, local->tx_headroom); 3353 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3354 beacon->head_len); 3355 3356 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3357 is_template); 3358 3359 if (offs) { 3360 offs->tim_offset = beacon->head_len; 3361 offs->tim_length = skb->len - beacon->head_len; 3362 3363 /* for AP the csa offsets are from tail */ 3364 csa_off_base = skb->len; 3365 } 3366 3367 if (beacon->tail) 3368 memcpy(skb_put(skb, beacon->tail_len), 3369 beacon->tail, beacon->tail_len); 3370 } else 3371 goto out; 3372 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3373 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3374 struct ieee80211_hdr *hdr; 3375 3376 beacon = rcu_dereference(ifibss->presp); 3377 if (!beacon) 3378 goto out; 3379 3380 if (beacon->csa_counter_offsets[0]) { 3381 if (!is_template) 3382 ieee80211_csa_update_counter(vif); 3383 3384 ieee80211_set_csa(sdata, beacon); 3385 } 3386 3387 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3388 local->hw.extra_beacon_tailroom); 3389 if (!skb) 3390 goto out; 3391 skb_reserve(skb, local->tx_headroom); 3392 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3393 beacon->head_len); 3394 3395 hdr = (struct ieee80211_hdr *) skb->data; 3396 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3397 IEEE80211_STYPE_BEACON); 3398 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3399 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3400 3401 beacon = rcu_dereference(ifmsh->beacon); 3402 if (!beacon) 3403 goto out; 3404 3405 if (beacon->csa_counter_offsets[0]) { 3406 if (!is_template) 3407 /* TODO: For mesh csa_counter is in TU, so 3408 * decrementing it by one isn't correct, but 3409 * for now we leave it consistent with overall 3410 * mac80211's behavior. 3411 */ 3412 ieee80211_csa_update_counter(vif); 3413 3414 ieee80211_set_csa(sdata, beacon); 3415 } 3416 3417 if (ifmsh->sync_ops) 3418 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3419 3420 skb = dev_alloc_skb(local->tx_headroom + 3421 beacon->head_len + 3422 256 + /* TIM IE */ 3423 beacon->tail_len + 3424 local->hw.extra_beacon_tailroom); 3425 if (!skb) 3426 goto out; 3427 skb_reserve(skb, local->tx_headroom); 3428 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3429 beacon->head_len); 3430 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3431 3432 if (offs) { 3433 offs->tim_offset = beacon->head_len; 3434 offs->tim_length = skb->len - beacon->head_len; 3435 } 3436 3437 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3438 beacon->tail_len); 3439 } else { 3440 WARN_ON(1); 3441 goto out; 3442 } 3443 3444 /* CSA offsets */ 3445 if (offs && beacon) { 3446 int i; 3447 3448 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3449 u16 csa_off = beacon->csa_counter_offsets[i]; 3450 3451 if (!csa_off) 3452 continue; 3453 3454 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3455 } 3456 } 3457 3458 band = chanctx_conf->def.chan->band; 3459 3460 info = IEEE80211_SKB_CB(skb); 3461 3462 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3463 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3464 info->band = band; 3465 3466 memset(&txrc, 0, sizeof(txrc)); 3467 txrc.hw = hw; 3468 txrc.sband = local->hw.wiphy->bands[band]; 3469 txrc.bss_conf = &sdata->vif.bss_conf; 3470 txrc.skb = skb; 3471 txrc.reported_rate.idx = -1; 3472 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3473 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3474 txrc.max_rate_idx = -1; 3475 else 3476 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3477 txrc.bss = true; 3478 rate_control_get_rate(sdata, NULL, &txrc); 3479 3480 info->control.vif = vif; 3481 3482 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3483 IEEE80211_TX_CTL_ASSIGN_SEQ | 3484 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3485 out: 3486 rcu_read_unlock(); 3487 return skb; 3488 3489 } 3490 3491 struct sk_buff * 3492 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3493 struct ieee80211_vif *vif, 3494 struct ieee80211_mutable_offsets *offs) 3495 { 3496 return __ieee80211_beacon_get(hw, vif, offs, true); 3497 } 3498 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3499 3500 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3501 struct ieee80211_vif *vif, 3502 u16 *tim_offset, u16 *tim_length) 3503 { 3504 struct ieee80211_mutable_offsets offs = {}; 3505 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3506 3507 if (tim_offset) 3508 *tim_offset = offs.tim_offset; 3509 3510 if (tim_length) 3511 *tim_length = offs.tim_length; 3512 3513 return bcn; 3514 } 3515 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3516 3517 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3518 struct ieee80211_vif *vif) 3519 { 3520 struct ieee80211_if_ap *ap = NULL; 3521 struct sk_buff *skb = NULL; 3522 struct probe_resp *presp = NULL; 3523 struct ieee80211_hdr *hdr; 3524 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3525 3526 if (sdata->vif.type != NL80211_IFTYPE_AP) 3527 return NULL; 3528 3529 rcu_read_lock(); 3530 3531 ap = &sdata->u.ap; 3532 presp = rcu_dereference(ap->probe_resp); 3533 if (!presp) 3534 goto out; 3535 3536 skb = dev_alloc_skb(presp->len); 3537 if (!skb) 3538 goto out; 3539 3540 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3541 3542 hdr = (struct ieee80211_hdr *) skb->data; 3543 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3544 3545 out: 3546 rcu_read_unlock(); 3547 return skb; 3548 } 3549 EXPORT_SYMBOL(ieee80211_proberesp_get); 3550 3551 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3552 struct ieee80211_vif *vif) 3553 { 3554 struct ieee80211_sub_if_data *sdata; 3555 struct ieee80211_if_managed *ifmgd; 3556 struct ieee80211_pspoll *pspoll; 3557 struct ieee80211_local *local; 3558 struct sk_buff *skb; 3559 3560 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3561 return NULL; 3562 3563 sdata = vif_to_sdata(vif); 3564 ifmgd = &sdata->u.mgd; 3565 local = sdata->local; 3566 3567 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3568 if (!skb) 3569 return NULL; 3570 3571 skb_reserve(skb, local->hw.extra_tx_headroom); 3572 3573 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3574 memset(pspoll, 0, sizeof(*pspoll)); 3575 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3576 IEEE80211_STYPE_PSPOLL); 3577 pspoll->aid = cpu_to_le16(ifmgd->aid); 3578 3579 /* aid in PS-Poll has its two MSBs each set to 1 */ 3580 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3581 3582 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3583 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3584 3585 return skb; 3586 } 3587 EXPORT_SYMBOL(ieee80211_pspoll_get); 3588 3589 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3590 struct ieee80211_vif *vif) 3591 { 3592 struct ieee80211_hdr_3addr *nullfunc; 3593 struct ieee80211_sub_if_data *sdata; 3594 struct ieee80211_if_managed *ifmgd; 3595 struct ieee80211_local *local; 3596 struct sk_buff *skb; 3597 3598 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3599 return NULL; 3600 3601 sdata = vif_to_sdata(vif); 3602 ifmgd = &sdata->u.mgd; 3603 local = sdata->local; 3604 3605 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3606 if (!skb) 3607 return NULL; 3608 3609 skb_reserve(skb, local->hw.extra_tx_headroom); 3610 3611 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3612 sizeof(*nullfunc)); 3613 memset(nullfunc, 0, sizeof(*nullfunc)); 3614 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3615 IEEE80211_STYPE_NULLFUNC | 3616 IEEE80211_FCTL_TODS); 3617 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3618 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3619 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3620 3621 return skb; 3622 } 3623 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3624 3625 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3626 const u8 *src_addr, 3627 const u8 *ssid, size_t ssid_len, 3628 size_t tailroom) 3629 { 3630 struct ieee80211_local *local = hw_to_local(hw); 3631 struct ieee80211_hdr_3addr *hdr; 3632 struct sk_buff *skb; 3633 size_t ie_ssid_len; 3634 u8 *pos; 3635 3636 ie_ssid_len = 2 + ssid_len; 3637 3638 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3639 ie_ssid_len + tailroom); 3640 if (!skb) 3641 return NULL; 3642 3643 skb_reserve(skb, local->hw.extra_tx_headroom); 3644 3645 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3646 memset(hdr, 0, sizeof(*hdr)); 3647 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3648 IEEE80211_STYPE_PROBE_REQ); 3649 eth_broadcast_addr(hdr->addr1); 3650 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3651 eth_broadcast_addr(hdr->addr3); 3652 3653 pos = skb_put(skb, ie_ssid_len); 3654 *pos++ = WLAN_EID_SSID; 3655 *pos++ = ssid_len; 3656 if (ssid_len) 3657 memcpy(pos, ssid, ssid_len); 3658 pos += ssid_len; 3659 3660 return skb; 3661 } 3662 EXPORT_SYMBOL(ieee80211_probereq_get); 3663 3664 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3665 const void *frame, size_t frame_len, 3666 const struct ieee80211_tx_info *frame_txctl, 3667 struct ieee80211_rts *rts) 3668 { 3669 const struct ieee80211_hdr *hdr = frame; 3670 3671 rts->frame_control = 3672 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3673 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3674 frame_txctl); 3675 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3676 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3677 } 3678 EXPORT_SYMBOL(ieee80211_rts_get); 3679 3680 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3681 const void *frame, size_t frame_len, 3682 const struct ieee80211_tx_info *frame_txctl, 3683 struct ieee80211_cts *cts) 3684 { 3685 const struct ieee80211_hdr *hdr = frame; 3686 3687 cts->frame_control = 3688 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3689 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3690 frame_len, frame_txctl); 3691 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3692 } 3693 EXPORT_SYMBOL(ieee80211_ctstoself_get); 3694 3695 struct sk_buff * 3696 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 3697 struct ieee80211_vif *vif) 3698 { 3699 struct ieee80211_local *local = hw_to_local(hw); 3700 struct sk_buff *skb = NULL; 3701 struct ieee80211_tx_data tx; 3702 struct ieee80211_sub_if_data *sdata; 3703 struct ps_data *ps; 3704 struct ieee80211_tx_info *info; 3705 struct ieee80211_chanctx_conf *chanctx_conf; 3706 3707 sdata = vif_to_sdata(vif); 3708 3709 rcu_read_lock(); 3710 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3711 3712 if (!chanctx_conf) 3713 goto out; 3714 3715 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3716 struct beacon_data *beacon = 3717 rcu_dereference(sdata->u.ap.beacon); 3718 3719 if (!beacon || !beacon->head) 3720 goto out; 3721 3722 ps = &sdata->u.ap.ps; 3723 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3724 ps = &sdata->u.mesh.ps; 3725 } else { 3726 goto out; 3727 } 3728 3729 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 3730 goto out; /* send buffered bc/mc only after DTIM beacon */ 3731 3732 while (1) { 3733 skb = skb_dequeue(&ps->bc_buf); 3734 if (!skb) 3735 goto out; 3736 local->total_ps_buffered--; 3737 3738 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 3739 struct ieee80211_hdr *hdr = 3740 (struct ieee80211_hdr *) skb->data; 3741 /* more buffered multicast/broadcast frames ==> set 3742 * MoreData flag in IEEE 802.11 header to inform PS 3743 * STAs */ 3744 hdr->frame_control |= 3745 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3746 } 3747 3748 if (sdata->vif.type == NL80211_IFTYPE_AP) 3749 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3750 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 3751 break; 3752 dev_kfree_skb_any(skb); 3753 } 3754 3755 info = IEEE80211_SKB_CB(skb); 3756 3757 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3758 info->band = chanctx_conf->def.chan->band; 3759 3760 if (invoke_tx_handlers(&tx)) 3761 skb = NULL; 3762 out: 3763 rcu_read_unlock(); 3764 3765 return skb; 3766 } 3767 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3768 3769 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3770 { 3771 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3772 struct ieee80211_sub_if_data *sdata = sta->sdata; 3773 struct ieee80211_local *local = sdata->local; 3774 int ret; 3775 u32 queues; 3776 3777 lockdep_assert_held(&local->sta_mtx); 3778 3779 /* only some cases are supported right now */ 3780 switch (sdata->vif.type) { 3781 case NL80211_IFTYPE_STATION: 3782 case NL80211_IFTYPE_AP: 3783 case NL80211_IFTYPE_AP_VLAN: 3784 break; 3785 default: 3786 WARN_ON(1); 3787 return -EINVAL; 3788 } 3789 3790 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 3791 return -EINVAL; 3792 3793 if (sta->reserved_tid == tid) { 3794 ret = 0; 3795 goto out; 3796 } 3797 3798 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 3799 sdata_err(sdata, "TID reservation already active\n"); 3800 ret = -EALREADY; 3801 goto out; 3802 } 3803 3804 ieee80211_stop_vif_queues(sdata->local, sdata, 3805 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3806 3807 synchronize_net(); 3808 3809 /* Tear down BA sessions so we stop aggregating on this TID */ 3810 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 3811 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 3812 __ieee80211_stop_tx_ba_session(sta, tid, 3813 AGG_STOP_LOCAL_REQUEST); 3814 } 3815 3816 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 3817 __ieee80211_flush_queues(local, sdata, queues, false); 3818 3819 sta->reserved_tid = tid; 3820 3821 ieee80211_wake_vif_queues(local, sdata, 3822 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3823 3824 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 3825 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 3826 3827 ret = 0; 3828 out: 3829 return ret; 3830 } 3831 EXPORT_SYMBOL(ieee80211_reserve_tid); 3832 3833 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3834 { 3835 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3836 struct ieee80211_sub_if_data *sdata = sta->sdata; 3837 3838 lockdep_assert_held(&sdata->local->sta_mtx); 3839 3840 /* only some cases are supported right now */ 3841 switch (sdata->vif.type) { 3842 case NL80211_IFTYPE_STATION: 3843 case NL80211_IFTYPE_AP: 3844 case NL80211_IFTYPE_AP_VLAN: 3845 break; 3846 default: 3847 WARN_ON(1); 3848 return; 3849 } 3850 3851 if (tid != sta->reserved_tid) { 3852 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 3853 return; 3854 } 3855 3856 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 3857 } 3858 EXPORT_SYMBOL(ieee80211_unreserve_tid); 3859 3860 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3861 struct sk_buff *skb, int tid, 3862 enum ieee80211_band band) 3863 { 3864 int ac = ieee802_1d_to_ac[tid & 7]; 3865 3866 skb_set_mac_header(skb, 0); 3867 skb_set_network_header(skb, 0); 3868 skb_set_transport_header(skb, 0); 3869 3870 skb_set_queue_mapping(skb, ac); 3871 skb->priority = tid; 3872 3873 skb->dev = sdata->dev; 3874 3875 /* 3876 * The other path calling ieee80211_xmit is from the tasklet, 3877 * and while we can handle concurrent transmissions locking 3878 * requirements are that we do not come into tx with bhs on. 3879 */ 3880 local_bh_disable(); 3881 IEEE80211_SKB_CB(skb)->band = band; 3882 ieee80211_xmit(sdata, NULL, skb); 3883 local_bh_enable(); 3884 } 3885