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->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 332 ieee80211_is_data(hdr->frame_control) && 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 334 /* 335 * No associated STAs - no need to send multicast 336 * frames. 337 */ 338 return TX_DROP; 339 } 340 341 return TX_CONTINUE; 342 } 343 344 /* This function is called whenever the AP is about to exceed the maximum limit 345 * of buffered frames for power saving STAs. This situation should not really 346 * happen often during normal operation, so dropping the oldest buffered packet 347 * from each queue should be OK to make some room for new frames. */ 348 static void purge_old_ps_buffers(struct ieee80211_local *local) 349 { 350 int total = 0, purged = 0; 351 struct sk_buff *skb; 352 struct ieee80211_sub_if_data *sdata; 353 struct sta_info *sta; 354 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 356 struct ps_data *ps; 357 358 if (sdata->vif.type == NL80211_IFTYPE_AP) 359 ps = &sdata->u.ap.ps; 360 else if (ieee80211_vif_is_mesh(&sdata->vif)) 361 ps = &sdata->u.mesh.ps; 362 else 363 continue; 364 365 skb = skb_dequeue(&ps->bc_buf); 366 if (skb) { 367 purged++; 368 dev_kfree_skb(skb); 369 } 370 total += skb_queue_len(&ps->bc_buf); 371 } 372 373 /* 374 * Drop one frame from each station from the lowest-priority 375 * AC that has frames at all. 376 */ 377 list_for_each_entry_rcu(sta, &local->sta_list, list) { 378 int ac; 379 380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 381 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 382 total += skb_queue_len(&sta->ps_tx_buf[ac]); 383 if (skb) { 384 purged++; 385 ieee80211_free_txskb(&local->hw, skb); 386 break; 387 } 388 } 389 } 390 391 local->total_ps_buffered = total; 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 393 } 394 395 static ieee80211_tx_result 396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 397 { 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 400 struct ps_data *ps; 401 402 /* 403 * broadcast/multicast frame 404 * 405 * If any of the associated/peer stations is in power save mode, 406 * the frame is buffered to be sent after DTIM beacon frame. 407 * This is done either by the hardware or us. 408 */ 409 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 413 if (!tx->sdata->bss) 414 return TX_CONTINUE; 415 416 ps = &tx->sdata->bss->ps; 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 418 ps = &tx->sdata->u.mesh.ps; 419 } else { 420 return TX_CONTINUE; 421 } 422 423 424 /* no buffering for ordered frames */ 425 if (ieee80211_has_order(hdr->frame_control)) 426 return TX_CONTINUE; 427 428 if (ieee80211_is_probe_req(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 432 info->hw_queue = tx->sdata->vif.cab_queue; 433 434 /* no stations in PS mode */ 435 if (!atomic_read(&ps->num_sta_ps)) 436 return TX_CONTINUE; 437 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 439 440 /* device releases frame after DTIM beacon */ 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 442 return TX_CONTINUE; 443 444 /* buffered in mac80211 */ 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 446 purge_old_ps_buffers(tx->local); 447 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 449 ps_dbg(tx->sdata, 450 "BC TX buffer full - dropping the oldest frame\n"); 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 452 } else 453 tx->local->total_ps_buffered++; 454 455 skb_queue_tail(&ps->bc_buf, tx->skb); 456 457 return TX_QUEUED; 458 } 459 460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 461 struct sk_buff *skb) 462 { 463 if (!ieee80211_is_mgmt(fc)) 464 return 0; 465 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 467 return 0; 468 469 if (!ieee80211_is_robust_mgmt_frame(skb)) 470 return 0; 471 472 return 1; 473 } 474 475 static ieee80211_tx_result 476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 477 { 478 struct sta_info *sta = tx->sta; 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 481 struct ieee80211_local *local = tx->local; 482 483 if (unlikely(!sta)) 484 return TX_CONTINUE; 485 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 490 int ac = skb_get_queue_mapping(tx->skb); 491 492 if (ieee80211_is_mgmt(hdr->frame_control) && 493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 495 return TX_CONTINUE; 496 } 497 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 499 sta->sta.addr, sta->sta.aid, ac); 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 501 purge_old_ps_buffers(tx->local); 502 503 /* sync with ieee80211_sta_ps_deliver_wakeup */ 504 spin_lock(&sta->ps_lock); 505 /* 506 * STA woke up the meantime and all the frames on ps_tx_buf have 507 * been queued to pending queue. No reordering can happen, go 508 * ahead and Tx the packet. 509 */ 510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 513 spin_unlock(&sta->ps_lock); 514 return TX_CONTINUE; 515 } 516 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 519 ps_dbg(tx->sdata, 520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 521 sta->sta.addr, ac); 522 ieee80211_free_txskb(&local->hw, old); 523 } else 524 tx->local->total_ps_buffered++; 525 526 info->control.jiffies = jiffies; 527 info->control.vif = &tx->sdata->vif; 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 531 spin_unlock(&sta->ps_lock); 532 533 if (!timer_pending(&local->sta_cleanup)) 534 mod_timer(&local->sta_cleanup, 535 round_jiffies(jiffies + 536 STA_INFO_CLEANUP_INTERVAL)); 537 538 /* 539 * We queued up some frames, so the TIM bit might 540 * need to be set, recalculate it. 541 */ 542 sta_info_recalc_tim(sta); 543 544 return TX_QUEUED; 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 546 ps_dbg(tx->sdata, 547 "STA %pM in PS mode, but polling/in SP -> send frame\n", 548 sta->sta.addr); 549 } 550 551 return TX_CONTINUE; 552 } 553 554 static ieee80211_tx_result debug_noinline 555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 556 { 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 558 return TX_CONTINUE; 559 560 if (tx->flags & IEEE80211_TX_UNICAST) 561 return ieee80211_tx_h_unicast_ps_buf(tx); 562 else 563 return ieee80211_tx_h_multicast_ps_buf(tx); 564 } 565 566 static ieee80211_tx_result debug_noinline 567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 568 { 569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 570 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 572 if (tx->sdata->control_port_no_encrypt) 573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 576 } 577 578 return TX_CONTINUE; 579 } 580 581 static ieee80211_tx_result debug_noinline 582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 583 { 584 struct ieee80211_key *key; 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 587 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 589 tx->key = NULL; 590 else if (tx->sta && 591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 592 tx->key = key; 593 else if (ieee80211_is_mgmt(hdr->frame_control) && 594 is_multicast_ether_addr(hdr->addr1) && 595 ieee80211_is_robust_mgmt_frame(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 597 tx->key = key; 598 else if (is_multicast_ether_addr(hdr->addr1) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (!is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_unicast_key))) 603 tx->key = key; 604 else 605 tx->key = NULL; 606 607 if (tx->key) { 608 bool skip_hw = false; 609 610 /* TODO: add threshold stuff again */ 611 612 switch (tx->key->conf.cipher) { 613 case WLAN_CIPHER_SUITE_WEP40: 614 case WLAN_CIPHER_SUITE_WEP104: 615 case WLAN_CIPHER_SUITE_TKIP: 616 if (!ieee80211_is_data_present(hdr->frame_control)) 617 tx->key = NULL; 618 break; 619 case WLAN_CIPHER_SUITE_CCMP: 620 case WLAN_CIPHER_SUITE_CCMP_256: 621 case WLAN_CIPHER_SUITE_GCMP: 622 case WLAN_CIPHER_SUITE_GCMP_256: 623 if (!ieee80211_is_data_present(hdr->frame_control) && 624 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 625 tx->skb)) 626 tx->key = NULL; 627 else 628 skip_hw = (tx->key->conf.flags & 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 630 ieee80211_is_mgmt(hdr->frame_control); 631 break; 632 case WLAN_CIPHER_SUITE_AES_CMAC: 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 635 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 636 if (!ieee80211_is_mgmt(hdr->frame_control)) 637 tx->key = NULL; 638 break; 639 } 640 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 642 !ieee80211_is_deauth(hdr->frame_control))) 643 return TX_DROP; 644 645 if (!skip_hw && tx->key && 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 647 info->control.hw_key = &tx->key->conf; 648 } 649 650 return TX_CONTINUE; 651 } 652 653 static ieee80211_tx_result debug_noinline 654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 655 { 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 658 struct ieee80211_supported_band *sband; 659 u32 len; 660 struct ieee80211_tx_rate_control txrc; 661 struct ieee80211_sta_rates *ratetbl = NULL; 662 bool assoc = false; 663 664 memset(&txrc, 0, sizeof(txrc)); 665 666 sband = tx->local->hw.wiphy->bands[info->band]; 667 668 len = min_t(u32, tx->skb->len + FCS_LEN, 669 tx->local->hw.wiphy->frag_threshold); 670 671 /* set up the tx rate control struct we give the RC algo */ 672 txrc.hw = &tx->local->hw; 673 txrc.sband = sband; 674 txrc.bss_conf = &tx->sdata->vif.bss_conf; 675 txrc.skb = tx->skb; 676 txrc.reported_rate.idx = -1; 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 679 txrc.max_rate_idx = -1; 680 else 681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 682 683 if (tx->sdata->rc_has_mcs_mask[info->band]) 684 txrc.rate_idx_mcs_mask = 685 tx->sdata->rc_rateidx_mcs_mask[info->band]; 686 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 690 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 691 692 /* set up RTS protection if desired */ 693 if (len > tx->local->hw.wiphy->rts_threshold) { 694 txrc.rts = true; 695 } 696 697 info->control.use_rts = txrc.rts; 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 699 700 /* 701 * Use short preamble if the BSS can handle it, but not for 702 * management frames unless we know the receiver can handle 703 * that -- the management frame might be to a station that 704 * just wants a probe response. 705 */ 706 if (tx->sdata->vif.bss_conf.use_short_preamble && 707 (ieee80211_is_data(hdr->frame_control) || 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 709 txrc.short_preamble = true; 710 711 info->control.short_preamble = txrc.short_preamble; 712 713 if (tx->sta) 714 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 715 716 /* 717 * Lets not bother rate control if we're associated and cannot 718 * talk to the sta. This should not happen. 719 */ 720 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 721 !rate_usable_index_exists(sband, &tx->sta->sta), 722 "%s: Dropped data frame as no usable bitrate found while " 723 "scanning and associated. Target station: " 724 "%pM on %d GHz band\n", 725 tx->sdata->name, hdr->addr1, 726 info->band ? 5 : 2)) 727 return TX_DROP; 728 729 /* 730 * If we're associated with the sta at this point we know we can at 731 * least send the frame at the lowest bit rate. 732 */ 733 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 734 735 if (tx->sta && !info->control.skip_table) 736 ratetbl = rcu_dereference(tx->sta->sta.rates); 737 738 if (unlikely(info->control.rates[0].idx < 0)) { 739 if (ratetbl) { 740 struct ieee80211_tx_rate rate = { 741 .idx = ratetbl->rate[0].idx, 742 .flags = ratetbl->rate[0].flags, 743 .count = ratetbl->rate[0].count 744 }; 745 746 if (ratetbl->rate[0].idx < 0) 747 return TX_DROP; 748 749 tx->rate = rate; 750 } else { 751 return TX_DROP; 752 } 753 } else { 754 tx->rate = info->control.rates[0]; 755 } 756 757 if (txrc.reported_rate.idx < 0) { 758 txrc.reported_rate = tx->rate; 759 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 760 tx->sta->last_tx_rate = txrc.reported_rate; 761 } else if (tx->sta) 762 tx->sta->last_tx_rate = txrc.reported_rate; 763 764 if (ratetbl) 765 return TX_CONTINUE; 766 767 if (unlikely(!info->control.rates[0].count)) 768 info->control.rates[0].count = 1; 769 770 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 771 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 772 info->control.rates[0].count = 1; 773 774 return TX_CONTINUE; 775 } 776 777 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 778 { 779 u16 *seq = &sta->tid_seq[tid]; 780 __le16 ret = cpu_to_le16(*seq); 781 782 /* Increase the sequence number. */ 783 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 784 785 return ret; 786 } 787 788 static ieee80211_tx_result debug_noinline 789 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 790 { 791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 793 u8 *qc; 794 int tid; 795 796 /* 797 * Packet injection may want to control the sequence 798 * number, if we have no matching interface then we 799 * neither assign one ourselves nor ask the driver to. 800 */ 801 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 802 return TX_CONTINUE; 803 804 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 805 return TX_CONTINUE; 806 807 if (ieee80211_hdrlen(hdr->frame_control) < 24) 808 return TX_CONTINUE; 809 810 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 811 return TX_CONTINUE; 812 813 /* 814 * Anything but QoS data that has a sequence number field 815 * (is long enough) gets a sequence number from the global 816 * counter. QoS data frames with a multicast destination 817 * also use the global counter (802.11-2012 9.3.2.10). 818 */ 819 if (!ieee80211_is_data_qos(hdr->frame_control) || 820 is_multicast_ether_addr(hdr->addr1)) { 821 /* driver should assign sequence number */ 822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 823 /* for pure STA mode without beacons, we can do it */ 824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 825 tx->sdata->sequence_number += 0x10; 826 if (tx->sta) 827 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++; 828 return TX_CONTINUE; 829 } 830 831 /* 832 * This should be true for injected/management frames only, for 833 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 834 * above since they are not QoS-data frames. 835 */ 836 if (!tx->sta) 837 return TX_CONTINUE; 838 839 /* include per-STA, per-TID sequence counter */ 840 841 qc = ieee80211_get_qos_ctl(hdr); 842 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 843 tx->sta->tx_msdu[tid]++; 844 845 if (!tx->sta->sta.txq[0]) 846 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 847 848 return TX_CONTINUE; 849 } 850 851 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 852 struct sk_buff *skb, int hdrlen, 853 int frag_threshold) 854 { 855 struct ieee80211_local *local = tx->local; 856 struct ieee80211_tx_info *info; 857 struct sk_buff *tmp; 858 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 859 int pos = hdrlen + per_fragm; 860 int rem = skb->len - hdrlen - per_fragm; 861 862 if (WARN_ON(rem < 0)) 863 return -EINVAL; 864 865 /* first fragment was already added to queue by caller */ 866 867 while (rem) { 868 int fraglen = per_fragm; 869 870 if (fraglen > rem) 871 fraglen = rem; 872 rem -= fraglen; 873 tmp = dev_alloc_skb(local->tx_headroom + 874 frag_threshold + 875 tx->sdata->encrypt_headroom + 876 IEEE80211_ENCRYPT_TAILROOM); 877 if (!tmp) 878 return -ENOMEM; 879 880 __skb_queue_tail(&tx->skbs, tmp); 881 882 skb_reserve(tmp, 883 local->tx_headroom + tx->sdata->encrypt_headroom); 884 885 /* copy control information */ 886 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 887 888 info = IEEE80211_SKB_CB(tmp); 889 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 890 IEEE80211_TX_CTL_FIRST_FRAGMENT); 891 892 if (rem) 893 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 894 895 skb_copy_queue_mapping(tmp, skb); 896 tmp->priority = skb->priority; 897 tmp->dev = skb->dev; 898 899 /* copy header and data */ 900 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 901 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 902 903 pos += fraglen; 904 } 905 906 /* adjust first fragment's length */ 907 skb_trim(skb, hdrlen + per_fragm); 908 return 0; 909 } 910 911 static ieee80211_tx_result debug_noinline 912 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 913 { 914 struct sk_buff *skb = tx->skb; 915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 916 struct ieee80211_hdr *hdr = (void *)skb->data; 917 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 918 int hdrlen; 919 int fragnum; 920 921 /* no matter what happens, tx->skb moves to tx->skbs */ 922 __skb_queue_tail(&tx->skbs, skb); 923 tx->skb = NULL; 924 925 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 926 return TX_CONTINUE; 927 928 if (tx->local->ops->set_frag_threshold) 929 return TX_CONTINUE; 930 931 /* 932 * Warn when submitting a fragmented A-MPDU frame and drop it. 933 * This scenario is handled in ieee80211_tx_prepare but extra 934 * caution taken here as fragmented ampdu may cause Tx stop. 935 */ 936 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 937 return TX_DROP; 938 939 hdrlen = ieee80211_hdrlen(hdr->frame_control); 940 941 /* internal error, why isn't DONTFRAG set? */ 942 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 943 return TX_DROP; 944 945 /* 946 * Now fragment the frame. This will allocate all the fragments and 947 * chain them (using skb as the first fragment) to skb->next. 948 * During transmission, we will remove the successfully transmitted 949 * fragments from this list. When the low-level driver rejects one 950 * of the fragments then we will simply pretend to accept the skb 951 * but store it away as pending. 952 */ 953 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 954 return TX_DROP; 955 956 /* update duration/seq/flags of fragments */ 957 fragnum = 0; 958 959 skb_queue_walk(&tx->skbs, skb) { 960 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 961 962 hdr = (void *)skb->data; 963 info = IEEE80211_SKB_CB(skb); 964 965 if (!skb_queue_is_last(&tx->skbs, skb)) { 966 hdr->frame_control |= morefrags; 967 /* 968 * No multi-rate retries for fragmented frames, that 969 * would completely throw off the NAV at other STAs. 970 */ 971 info->control.rates[1].idx = -1; 972 info->control.rates[2].idx = -1; 973 info->control.rates[3].idx = -1; 974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 975 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 976 } else { 977 hdr->frame_control &= ~morefrags; 978 } 979 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 980 fragnum++; 981 } 982 983 return TX_CONTINUE; 984 } 985 986 static ieee80211_tx_result debug_noinline 987 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 988 { 989 struct sk_buff *skb; 990 int ac = -1; 991 992 if (!tx->sta) 993 return TX_CONTINUE; 994 995 skb_queue_walk(&tx->skbs, skb) { 996 ac = skb_get_queue_mapping(skb); 997 tx->sta->tx_bytes[ac] += skb->len; 998 } 999 if (ac >= 0) 1000 tx->sta->tx_packets[ac]++; 1001 1002 return TX_CONTINUE; 1003 } 1004 1005 static ieee80211_tx_result debug_noinline 1006 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1007 { 1008 if (!tx->key) 1009 return TX_CONTINUE; 1010 1011 switch (tx->key->conf.cipher) { 1012 case WLAN_CIPHER_SUITE_WEP40: 1013 case WLAN_CIPHER_SUITE_WEP104: 1014 return ieee80211_crypto_wep_encrypt(tx); 1015 case WLAN_CIPHER_SUITE_TKIP: 1016 return ieee80211_crypto_tkip_encrypt(tx); 1017 case WLAN_CIPHER_SUITE_CCMP: 1018 return ieee80211_crypto_ccmp_encrypt( 1019 tx, IEEE80211_CCMP_MIC_LEN); 1020 case WLAN_CIPHER_SUITE_CCMP_256: 1021 return ieee80211_crypto_ccmp_encrypt( 1022 tx, IEEE80211_CCMP_256_MIC_LEN); 1023 case WLAN_CIPHER_SUITE_AES_CMAC: 1024 return ieee80211_crypto_aes_cmac_encrypt(tx); 1025 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1026 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1027 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1028 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1029 return ieee80211_crypto_aes_gmac_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_GCMP: 1031 case WLAN_CIPHER_SUITE_GCMP_256: 1032 return ieee80211_crypto_gcmp_encrypt(tx); 1033 default: 1034 return ieee80211_crypto_hw_encrypt(tx); 1035 } 1036 1037 return TX_DROP; 1038 } 1039 1040 static ieee80211_tx_result debug_noinline 1041 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1042 { 1043 struct sk_buff *skb; 1044 struct ieee80211_hdr *hdr; 1045 int next_len; 1046 bool group_addr; 1047 1048 skb_queue_walk(&tx->skbs, skb) { 1049 hdr = (void *) skb->data; 1050 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1051 break; /* must not overwrite AID */ 1052 if (!skb_queue_is_last(&tx->skbs, skb)) { 1053 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1054 next_len = next->len; 1055 } else 1056 next_len = 0; 1057 group_addr = is_multicast_ether_addr(hdr->addr1); 1058 1059 hdr->duration_id = 1060 ieee80211_duration(tx, skb, group_addr, next_len); 1061 } 1062 1063 return TX_CONTINUE; 1064 } 1065 1066 /* actual transmit path */ 1067 1068 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1069 struct sk_buff *skb, 1070 struct ieee80211_tx_info *info, 1071 struct tid_ampdu_tx *tid_tx, 1072 int tid) 1073 { 1074 bool queued = false; 1075 bool reset_agg_timer = false; 1076 struct sk_buff *purge_skb = NULL; 1077 1078 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1079 info->flags |= IEEE80211_TX_CTL_AMPDU; 1080 reset_agg_timer = true; 1081 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1082 /* 1083 * nothing -- this aggregation session is being started 1084 * but that might still fail with the driver 1085 */ 1086 } else if (!tx->sta->sta.txq[tid]) { 1087 spin_lock(&tx->sta->lock); 1088 /* 1089 * Need to re-check now, because we may get here 1090 * 1091 * 1) in the window during which the setup is actually 1092 * already done, but not marked yet because not all 1093 * packets are spliced over to the driver pending 1094 * queue yet -- if this happened we acquire the lock 1095 * either before or after the splice happens, but 1096 * need to recheck which of these cases happened. 1097 * 1098 * 2) during session teardown, if the OPERATIONAL bit 1099 * was cleared due to the teardown but the pointer 1100 * hasn't been assigned NULL yet (or we loaded it 1101 * before it was assigned) -- in this case it may 1102 * now be NULL which means we should just let the 1103 * packet pass through because splicing the frames 1104 * back is already done. 1105 */ 1106 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1107 1108 if (!tid_tx) { 1109 /* do nothing, let packet pass through */ 1110 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1111 info->flags |= IEEE80211_TX_CTL_AMPDU; 1112 reset_agg_timer = true; 1113 } else { 1114 queued = true; 1115 info->control.vif = &tx->sdata->vif; 1116 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1117 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS | 1118 IEEE80211_TX_CTL_NO_PS_BUFFER | 1119 IEEE80211_TX_STATUS_EOSP; 1120 __skb_queue_tail(&tid_tx->pending, skb); 1121 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1122 purge_skb = __skb_dequeue(&tid_tx->pending); 1123 } 1124 spin_unlock(&tx->sta->lock); 1125 1126 if (purge_skb) 1127 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1128 } 1129 1130 /* reset session timer */ 1131 if (reset_agg_timer && tid_tx->timeout) 1132 tid_tx->last_tx = jiffies; 1133 1134 return queued; 1135 } 1136 1137 /* 1138 * initialises @tx 1139 * pass %NULL for the station if unknown, a valid pointer if known 1140 * or an ERR_PTR() if the station is known not to exist 1141 */ 1142 static ieee80211_tx_result 1143 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1144 struct ieee80211_tx_data *tx, 1145 struct sta_info *sta, struct sk_buff *skb) 1146 { 1147 struct ieee80211_local *local = sdata->local; 1148 struct ieee80211_hdr *hdr; 1149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1150 int tid; 1151 u8 *qc; 1152 1153 memset(tx, 0, sizeof(*tx)); 1154 tx->skb = skb; 1155 tx->local = local; 1156 tx->sdata = sdata; 1157 __skb_queue_head_init(&tx->skbs); 1158 1159 /* 1160 * If this flag is set to true anywhere, and we get here, 1161 * we are doing the needed processing, so remove the flag 1162 * now. 1163 */ 1164 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1165 1166 hdr = (struct ieee80211_hdr *) skb->data; 1167 1168 if (likely(sta)) { 1169 if (!IS_ERR(sta)) 1170 tx->sta = sta; 1171 } else { 1172 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1173 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1174 if (!tx->sta && sdata->wdev.use_4addr) 1175 return TX_DROP; 1176 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1177 IEEE80211_TX_CTL_INJECTED) || 1178 tx->sdata->control_port_protocol == tx->skb->protocol) { 1179 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1180 } 1181 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1182 tx->sta = sta_info_get(sdata, hdr->addr1); 1183 } 1184 1185 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1186 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1187 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1188 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1189 struct tid_ampdu_tx *tid_tx; 1190 1191 qc = ieee80211_get_qos_ctl(hdr); 1192 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1193 1194 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1195 if (tid_tx) { 1196 bool queued; 1197 1198 queued = ieee80211_tx_prep_agg(tx, skb, info, 1199 tid_tx, tid); 1200 1201 if (unlikely(queued)) 1202 return TX_QUEUED; 1203 } 1204 } 1205 1206 if (is_multicast_ether_addr(hdr->addr1)) { 1207 tx->flags &= ~IEEE80211_TX_UNICAST; 1208 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1209 } else 1210 tx->flags |= IEEE80211_TX_UNICAST; 1211 1212 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1213 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1214 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1215 info->flags & IEEE80211_TX_CTL_AMPDU) 1216 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1217 } 1218 1219 if (!tx->sta) 1220 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1221 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1222 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1223 1224 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1225 1226 return TX_CONTINUE; 1227 } 1228 1229 static void ieee80211_drv_tx(struct ieee80211_local *local, 1230 struct ieee80211_vif *vif, 1231 struct ieee80211_sta *pubsta, 1232 struct sk_buff *skb) 1233 { 1234 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1235 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1236 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1237 struct ieee80211_tx_control control = { 1238 .sta = pubsta, 1239 }; 1240 struct ieee80211_txq *txq = NULL; 1241 struct txq_info *txqi; 1242 u8 ac; 1243 1244 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE) 1245 goto tx_normal; 1246 1247 if (!ieee80211_is_data(hdr->frame_control)) 1248 goto tx_normal; 1249 1250 if (pubsta) { 1251 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1252 1253 txq = pubsta->txq[tid]; 1254 } else if (vif) { 1255 txq = vif->txq; 1256 } 1257 1258 if (!txq) 1259 goto tx_normal; 1260 1261 ac = txq->ac; 1262 txqi = to_txq_info(txq); 1263 atomic_inc(&sdata->txqs_len[ac]); 1264 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending) 1265 netif_stop_subqueue(sdata->dev, ac); 1266 1267 skb_queue_tail(&txqi->queue, skb); 1268 drv_wake_tx_queue(local, txqi); 1269 1270 return; 1271 1272 tx_normal: 1273 drv_tx(local, &control, skb); 1274 } 1275 1276 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1277 struct ieee80211_txq *txq) 1278 { 1279 struct ieee80211_local *local = hw_to_local(hw); 1280 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif); 1281 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1282 struct ieee80211_hdr *hdr; 1283 struct sk_buff *skb = NULL; 1284 u8 ac = txq->ac; 1285 1286 spin_lock_bh(&txqi->queue.lock); 1287 1288 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1289 goto out; 1290 1291 skb = __skb_dequeue(&txqi->queue); 1292 if (!skb) 1293 goto out; 1294 1295 atomic_dec(&sdata->txqs_len[ac]); 1296 if (__netif_subqueue_stopped(sdata->dev, ac)) 1297 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]); 1298 1299 hdr = (struct ieee80211_hdr *)skb->data; 1300 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1301 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1302 sta); 1303 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1304 1305 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1306 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1307 info->flags |= IEEE80211_TX_CTL_AMPDU; 1308 else 1309 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1310 } 1311 1312 out: 1313 spin_unlock_bh(&txqi->queue.lock); 1314 1315 return skb; 1316 } 1317 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1318 1319 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1320 struct ieee80211_vif *vif, 1321 struct ieee80211_sta *sta, 1322 struct sk_buff_head *skbs, 1323 bool txpending) 1324 { 1325 struct sk_buff *skb, *tmp; 1326 unsigned long flags; 1327 1328 skb_queue_walk_safe(skbs, skb, tmp) { 1329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1330 int q = info->hw_queue; 1331 1332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1333 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1334 __skb_unlink(skb, skbs); 1335 ieee80211_free_txskb(&local->hw, skb); 1336 continue; 1337 } 1338 #endif 1339 1340 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1341 if (local->queue_stop_reasons[q] || 1342 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1343 if (unlikely(info->flags & 1344 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1345 if (local->queue_stop_reasons[q] & 1346 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1347 /* 1348 * Drop off-channel frames if queues 1349 * are stopped for any reason other 1350 * than off-channel operation. Never 1351 * queue them. 1352 */ 1353 spin_unlock_irqrestore( 1354 &local->queue_stop_reason_lock, 1355 flags); 1356 ieee80211_purge_tx_queue(&local->hw, 1357 skbs); 1358 return true; 1359 } 1360 } else { 1361 1362 /* 1363 * Since queue is stopped, queue up frames for 1364 * later transmission from the tx-pending 1365 * tasklet when the queue is woken again. 1366 */ 1367 if (txpending) 1368 skb_queue_splice_init(skbs, 1369 &local->pending[q]); 1370 else 1371 skb_queue_splice_tail_init(skbs, 1372 &local->pending[q]); 1373 1374 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1375 flags); 1376 return false; 1377 } 1378 } 1379 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1380 1381 info->control.vif = vif; 1382 1383 __skb_unlink(skb, skbs); 1384 ieee80211_drv_tx(local, vif, sta, skb); 1385 } 1386 1387 return true; 1388 } 1389 1390 /* 1391 * Returns false if the frame couldn't be transmitted but was queued instead. 1392 */ 1393 static bool __ieee80211_tx(struct ieee80211_local *local, 1394 struct sk_buff_head *skbs, int led_len, 1395 struct sta_info *sta, bool txpending) 1396 { 1397 struct ieee80211_tx_info *info; 1398 struct ieee80211_sub_if_data *sdata; 1399 struct ieee80211_vif *vif; 1400 struct ieee80211_sta *pubsta; 1401 struct sk_buff *skb; 1402 bool result = true; 1403 __le16 fc; 1404 1405 if (WARN_ON(skb_queue_empty(skbs))) 1406 return true; 1407 1408 skb = skb_peek(skbs); 1409 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1410 info = IEEE80211_SKB_CB(skb); 1411 sdata = vif_to_sdata(info->control.vif); 1412 if (sta && !sta->uploaded) 1413 sta = NULL; 1414 1415 if (sta) 1416 pubsta = &sta->sta; 1417 else 1418 pubsta = NULL; 1419 1420 switch (sdata->vif.type) { 1421 case NL80211_IFTYPE_MONITOR: 1422 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1423 vif = &sdata->vif; 1424 break; 1425 } 1426 sdata = rcu_dereference(local->monitor_sdata); 1427 if (sdata) { 1428 vif = &sdata->vif; 1429 info->hw_queue = 1430 vif->hw_queue[skb_get_queue_mapping(skb)]; 1431 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1432 dev_kfree_skb(skb); 1433 return true; 1434 } else 1435 vif = NULL; 1436 break; 1437 case NL80211_IFTYPE_AP_VLAN: 1438 sdata = container_of(sdata->bss, 1439 struct ieee80211_sub_if_data, u.ap); 1440 /* fall through */ 1441 default: 1442 vif = &sdata->vif; 1443 break; 1444 } 1445 1446 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1447 txpending); 1448 1449 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1450 1451 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1452 1453 return result; 1454 } 1455 1456 /* 1457 * Invoke TX handlers, return 0 on success and non-zero if the 1458 * frame was dropped or queued. 1459 */ 1460 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1461 { 1462 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1463 ieee80211_tx_result res = TX_DROP; 1464 1465 #define CALL_TXH(txh) \ 1466 do { \ 1467 res = txh(tx); \ 1468 if (res != TX_CONTINUE) \ 1469 goto txh_done; \ 1470 } while (0) 1471 1472 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1473 CALL_TXH(ieee80211_tx_h_check_assoc); 1474 CALL_TXH(ieee80211_tx_h_ps_buf); 1475 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1476 CALL_TXH(ieee80211_tx_h_select_key); 1477 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1478 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1479 1480 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1481 __skb_queue_tail(&tx->skbs, tx->skb); 1482 tx->skb = NULL; 1483 goto txh_done; 1484 } 1485 1486 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1487 CALL_TXH(ieee80211_tx_h_sequence); 1488 CALL_TXH(ieee80211_tx_h_fragment); 1489 /* handlers after fragment must be aware of tx info fragmentation! */ 1490 CALL_TXH(ieee80211_tx_h_stats); 1491 CALL_TXH(ieee80211_tx_h_encrypt); 1492 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1493 CALL_TXH(ieee80211_tx_h_calculate_duration); 1494 #undef CALL_TXH 1495 1496 txh_done: 1497 if (unlikely(res == TX_DROP)) { 1498 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1499 if (tx->skb) 1500 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1501 else 1502 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1503 return -1; 1504 } else if (unlikely(res == TX_QUEUED)) { 1505 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1506 return -1; 1507 } 1508 1509 return 0; 1510 } 1511 1512 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1513 struct ieee80211_vif *vif, struct sk_buff *skb, 1514 int band, struct ieee80211_sta **sta) 1515 { 1516 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1518 struct ieee80211_tx_data tx; 1519 struct sk_buff *skb2; 1520 1521 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1522 return false; 1523 1524 info->band = band; 1525 info->control.vif = vif; 1526 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1527 1528 if (invoke_tx_handlers(&tx)) 1529 return false; 1530 1531 if (sta) { 1532 if (tx.sta) 1533 *sta = &tx.sta->sta; 1534 else 1535 *sta = NULL; 1536 } 1537 1538 /* this function isn't suitable for fragmented data frames */ 1539 skb2 = __skb_dequeue(&tx.skbs); 1540 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1541 ieee80211_free_txskb(hw, skb2); 1542 ieee80211_purge_tx_queue(hw, &tx.skbs); 1543 return false; 1544 } 1545 1546 return true; 1547 } 1548 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1549 1550 /* 1551 * Returns false if the frame couldn't be transmitted but was queued instead. 1552 */ 1553 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1554 struct sta_info *sta, struct sk_buff *skb, 1555 bool txpending) 1556 { 1557 struct ieee80211_local *local = sdata->local; 1558 struct ieee80211_tx_data tx; 1559 ieee80211_tx_result res_prepare; 1560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1561 bool result = true; 1562 int led_len; 1563 1564 if (unlikely(skb->len < 10)) { 1565 dev_kfree_skb(skb); 1566 return true; 1567 } 1568 1569 /* initialises tx */ 1570 led_len = skb->len; 1571 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1572 1573 if (unlikely(res_prepare == TX_DROP)) { 1574 ieee80211_free_txskb(&local->hw, skb); 1575 return true; 1576 } else if (unlikely(res_prepare == TX_QUEUED)) { 1577 return true; 1578 } 1579 1580 /* set up hw_queue value early */ 1581 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1582 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1583 info->hw_queue = 1584 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1585 1586 if (!invoke_tx_handlers(&tx)) 1587 result = __ieee80211_tx(local, &tx.skbs, led_len, 1588 tx.sta, txpending); 1589 1590 return result; 1591 } 1592 1593 /* device xmit handlers */ 1594 1595 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1596 struct sk_buff *skb, 1597 int head_need, bool may_encrypt) 1598 { 1599 struct ieee80211_local *local = sdata->local; 1600 int tail_need = 0; 1601 1602 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1603 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1604 tail_need -= skb_tailroom(skb); 1605 tail_need = max_t(int, tail_need, 0); 1606 } 1607 1608 if (skb_cloned(skb) && 1609 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1610 !skb_clone_writable(skb, ETH_HLEN) || 1611 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1612 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1613 else if (head_need || tail_need) 1614 I802_DEBUG_INC(local->tx_expand_skb_head); 1615 else 1616 return 0; 1617 1618 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1619 wiphy_debug(local->hw.wiphy, 1620 "failed to reallocate TX buffer\n"); 1621 return -ENOMEM; 1622 } 1623 1624 return 0; 1625 } 1626 1627 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1628 struct sta_info *sta, struct sk_buff *skb) 1629 { 1630 struct ieee80211_local *local = sdata->local; 1631 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1633 int headroom; 1634 bool may_encrypt; 1635 1636 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1637 1638 headroom = local->tx_headroom; 1639 if (may_encrypt) 1640 headroom += sdata->encrypt_headroom; 1641 headroom -= skb_headroom(skb); 1642 headroom = max_t(int, 0, headroom); 1643 1644 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1645 ieee80211_free_txskb(&local->hw, skb); 1646 return; 1647 } 1648 1649 hdr = (struct ieee80211_hdr *) skb->data; 1650 info->control.vif = &sdata->vif; 1651 1652 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1653 if (ieee80211_is_data(hdr->frame_control) && 1654 is_unicast_ether_addr(hdr->addr1)) { 1655 if (mesh_nexthop_resolve(sdata, skb)) 1656 return; /* skb queued: don't free */ 1657 } else { 1658 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1659 } 1660 } 1661 1662 ieee80211_set_qos_hdr(sdata, skb); 1663 ieee80211_tx(sdata, sta, skb, false); 1664 } 1665 1666 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1667 { 1668 struct ieee80211_radiotap_iterator iterator; 1669 struct ieee80211_radiotap_header *rthdr = 1670 (struct ieee80211_radiotap_header *) skb->data; 1671 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1672 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1673 NULL); 1674 u16 txflags; 1675 1676 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1677 IEEE80211_TX_CTL_DONTFRAG; 1678 1679 /* 1680 * for every radiotap entry that is present 1681 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1682 * entries present, or -EINVAL on error) 1683 */ 1684 1685 while (!ret) { 1686 ret = ieee80211_radiotap_iterator_next(&iterator); 1687 1688 if (ret) 1689 continue; 1690 1691 /* see if this argument is something we can use */ 1692 switch (iterator.this_arg_index) { 1693 /* 1694 * You must take care when dereferencing iterator.this_arg 1695 * for multibyte types... the pointer is not aligned. Use 1696 * get_unaligned((type *)iterator.this_arg) to dereference 1697 * iterator.this_arg for type "type" safely on all arches. 1698 */ 1699 case IEEE80211_RADIOTAP_FLAGS: 1700 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1701 /* 1702 * this indicates that the skb we have been 1703 * handed has the 32-bit FCS CRC at the end... 1704 * we should react to that by snipping it off 1705 * because it will be recomputed and added 1706 * on transmission 1707 */ 1708 if (skb->len < (iterator._max_length + FCS_LEN)) 1709 return false; 1710 1711 skb_trim(skb, skb->len - FCS_LEN); 1712 } 1713 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1714 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1715 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1716 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1717 break; 1718 1719 case IEEE80211_RADIOTAP_TX_FLAGS: 1720 txflags = get_unaligned_le16(iterator.this_arg); 1721 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1722 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1723 break; 1724 1725 /* 1726 * Please update the file 1727 * Documentation/networking/mac80211-injection.txt 1728 * when parsing new fields here. 1729 */ 1730 1731 default: 1732 break; 1733 } 1734 } 1735 1736 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1737 return false; 1738 1739 /* 1740 * remove the radiotap header 1741 * iterator->_max_length was sanity-checked against 1742 * skb->len by iterator init 1743 */ 1744 skb_pull(skb, iterator._max_length); 1745 1746 return true; 1747 } 1748 1749 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1750 struct net_device *dev) 1751 { 1752 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1753 struct ieee80211_chanctx_conf *chanctx_conf; 1754 struct ieee80211_radiotap_header *prthdr = 1755 (struct ieee80211_radiotap_header *)skb->data; 1756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1757 struct ieee80211_hdr *hdr; 1758 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1759 struct cfg80211_chan_def *chandef; 1760 u16 len_rthdr; 1761 int hdrlen; 1762 1763 /* check for not even having the fixed radiotap header part */ 1764 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1765 goto fail; /* too short to be possibly valid */ 1766 1767 /* is it a header version we can trust to find length from? */ 1768 if (unlikely(prthdr->it_version)) 1769 goto fail; /* only version 0 is supported */ 1770 1771 /* then there must be a radiotap header with a length we can use */ 1772 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1773 1774 /* does the skb contain enough to deliver on the alleged length? */ 1775 if (unlikely(skb->len < len_rthdr)) 1776 goto fail; /* skb too short for claimed rt header extent */ 1777 1778 /* 1779 * fix up the pointers accounting for the radiotap 1780 * header still being in there. We are being given 1781 * a precooked IEEE80211 header so no need for 1782 * normal processing 1783 */ 1784 skb_set_mac_header(skb, len_rthdr); 1785 /* 1786 * these are just fixed to the end of the rt area since we 1787 * don't have any better information and at this point, nobody cares 1788 */ 1789 skb_set_network_header(skb, len_rthdr); 1790 skb_set_transport_header(skb, len_rthdr); 1791 1792 if (skb->len < len_rthdr + 2) 1793 goto fail; 1794 1795 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1796 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1797 1798 if (skb->len < len_rthdr + hdrlen) 1799 goto fail; 1800 1801 /* 1802 * Initialize skb->protocol if the injected frame is a data frame 1803 * carrying a rfc1042 header 1804 */ 1805 if (ieee80211_is_data(hdr->frame_control) && 1806 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1807 u8 *payload = (u8 *)hdr + hdrlen; 1808 1809 if (ether_addr_equal(payload, rfc1042_header)) 1810 skb->protocol = cpu_to_be16((payload[6] << 8) | 1811 payload[7]); 1812 } 1813 1814 memset(info, 0, sizeof(*info)); 1815 1816 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1817 IEEE80211_TX_CTL_INJECTED; 1818 1819 /* process and remove the injection radiotap header */ 1820 if (!ieee80211_parse_tx_radiotap(skb)) 1821 goto fail; 1822 1823 rcu_read_lock(); 1824 1825 /* 1826 * We process outgoing injected frames that have a local address 1827 * we handle as though they are non-injected frames. 1828 * This code here isn't entirely correct, the local MAC address 1829 * isn't always enough to find the interface to use; for proper 1830 * VLAN/WDS support we will need a different mechanism (which 1831 * likely isn't going to be monitor interfaces). 1832 */ 1833 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1834 1835 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1836 if (!ieee80211_sdata_running(tmp_sdata)) 1837 continue; 1838 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1839 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1840 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1841 continue; 1842 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1843 sdata = tmp_sdata; 1844 break; 1845 } 1846 } 1847 1848 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1849 if (!chanctx_conf) { 1850 tmp_sdata = rcu_dereference(local->monitor_sdata); 1851 if (tmp_sdata) 1852 chanctx_conf = 1853 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1854 } 1855 1856 if (chanctx_conf) 1857 chandef = &chanctx_conf->def; 1858 else if (!local->use_chanctx) 1859 chandef = &local->_oper_chandef; 1860 else 1861 goto fail_rcu; 1862 1863 /* 1864 * Frame injection is not allowed if beaconing is not allowed 1865 * or if we need radar detection. Beaconing is usually not allowed when 1866 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1867 * Passive scan is also used in world regulatory domains where 1868 * your country is not known and as such it should be treated as 1869 * NO TX unless the channel is explicitly allowed in which case 1870 * your current regulatory domain would not have the passive scan 1871 * flag. 1872 * 1873 * Since AP mode uses monitor interfaces to inject/TX management 1874 * frames we can make AP mode the exception to this rule once it 1875 * supports radar detection as its implementation can deal with 1876 * radar detection by itself. We can do that later by adding a 1877 * monitor flag interfaces used for AP support. 1878 */ 1879 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1880 sdata->vif.type)) 1881 goto fail_rcu; 1882 1883 info->band = chandef->chan->band; 1884 ieee80211_xmit(sdata, NULL, skb); 1885 rcu_read_unlock(); 1886 1887 return NETDEV_TX_OK; 1888 1889 fail_rcu: 1890 rcu_read_unlock(); 1891 fail: 1892 dev_kfree_skb(skb); 1893 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1894 } 1895 1896 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 1897 { 1898 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 1899 1900 return ethertype == ETH_P_TDLS && 1901 skb->len > 14 && 1902 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1903 } 1904 1905 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 1906 struct sk_buff *skb, 1907 struct sta_info **sta_out) 1908 { 1909 struct sta_info *sta; 1910 1911 switch (sdata->vif.type) { 1912 case NL80211_IFTYPE_AP_VLAN: 1913 sta = rcu_dereference(sdata->u.vlan.sta); 1914 if (sta) { 1915 *sta_out = sta; 1916 return 0; 1917 } else if (sdata->wdev.use_4addr) { 1918 return -ENOLINK; 1919 } 1920 /* fall through */ 1921 case NL80211_IFTYPE_AP: 1922 case NL80211_IFTYPE_OCB: 1923 case NL80211_IFTYPE_ADHOC: 1924 if (is_multicast_ether_addr(skb->data)) { 1925 *sta_out = ERR_PTR(-ENOENT); 1926 return 0; 1927 } 1928 sta = sta_info_get_bss(sdata, skb->data); 1929 break; 1930 case NL80211_IFTYPE_WDS: 1931 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 1932 break; 1933 #ifdef CONFIG_MAC80211_MESH 1934 case NL80211_IFTYPE_MESH_POINT: 1935 /* determined much later */ 1936 *sta_out = NULL; 1937 return 0; 1938 #endif 1939 case NL80211_IFTYPE_STATION: 1940 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1941 sta = sta_info_get(sdata, skb->data); 1942 if (sta) { 1943 bool tdls_peer, tdls_auth; 1944 1945 tdls_peer = test_sta_flag(sta, 1946 WLAN_STA_TDLS_PEER); 1947 tdls_auth = test_sta_flag(sta, 1948 WLAN_STA_TDLS_PEER_AUTH); 1949 1950 if (tdls_peer && tdls_auth) { 1951 *sta_out = sta; 1952 return 0; 1953 } 1954 1955 /* 1956 * TDLS link during setup - throw out frames to 1957 * peer. Allow TDLS-setup frames to unauthorized 1958 * peers for the special case of a link teardown 1959 * after a TDLS sta is removed due to being 1960 * unreachable. 1961 */ 1962 if (tdls_peer && !tdls_auth && 1963 !ieee80211_is_tdls_setup(skb)) 1964 return -EINVAL; 1965 } 1966 1967 } 1968 1969 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 1970 if (!sta) 1971 return -ENOLINK; 1972 break; 1973 default: 1974 return -EINVAL; 1975 } 1976 1977 *sta_out = sta ?: ERR_PTR(-ENOENT); 1978 return 0; 1979 } 1980 1981 /** 1982 * ieee80211_build_hdr - build 802.11 header in the given frame 1983 * @sdata: virtual interface to build the header for 1984 * @skb: the skb to build the header in 1985 * @info_flags: skb flags to set 1986 * 1987 * This function takes the skb with 802.3 header and reformats the header to 1988 * the appropriate IEEE 802.11 header based on which interface the packet is 1989 * being transmitted on. 1990 * 1991 * Note that this function also takes care of the TX status request and 1992 * potential unsharing of the SKB - this needs to be interleaved with the 1993 * header building. 1994 * 1995 * The function requires the read-side RCU lock held 1996 * 1997 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 1998 */ 1999 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2000 struct sk_buff *skb, u32 info_flags, 2001 struct sta_info *sta) 2002 { 2003 struct ieee80211_local *local = sdata->local; 2004 struct ieee80211_tx_info *info; 2005 int head_need; 2006 u16 ethertype, hdrlen, meshhdrlen = 0; 2007 __le16 fc; 2008 struct ieee80211_hdr hdr; 2009 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2010 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2011 const u8 *encaps_data; 2012 int encaps_len, skip_header_bytes; 2013 int nh_pos, h_pos; 2014 bool wme_sta = false, authorized = false; 2015 bool tdls_peer; 2016 bool multicast; 2017 u16 info_id = 0; 2018 struct ieee80211_chanctx_conf *chanctx_conf; 2019 struct ieee80211_sub_if_data *ap_sdata; 2020 enum ieee80211_band band; 2021 int ret; 2022 2023 if (IS_ERR(sta)) 2024 sta = NULL; 2025 2026 /* convert Ethernet header to proper 802.11 header (based on 2027 * operation mode) */ 2028 ethertype = (skb->data[12] << 8) | skb->data[13]; 2029 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2030 2031 switch (sdata->vif.type) { 2032 case NL80211_IFTYPE_AP_VLAN: 2033 if (sdata->wdev.use_4addr) { 2034 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2035 /* RA TA DA SA */ 2036 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2037 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2038 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2039 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2040 hdrlen = 30; 2041 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2042 wme_sta = sta->sta.wme; 2043 } 2044 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2045 u.ap); 2046 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2047 if (!chanctx_conf) { 2048 ret = -ENOTCONN; 2049 goto free; 2050 } 2051 band = chanctx_conf->def.chan->band; 2052 if (sdata->wdev.use_4addr) 2053 break; 2054 /* fall through */ 2055 case NL80211_IFTYPE_AP: 2056 if (sdata->vif.type == NL80211_IFTYPE_AP) 2057 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2058 if (!chanctx_conf) { 2059 ret = -ENOTCONN; 2060 goto free; 2061 } 2062 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2063 /* DA BSSID SA */ 2064 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2065 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2066 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2067 hdrlen = 24; 2068 band = chanctx_conf->def.chan->band; 2069 break; 2070 case NL80211_IFTYPE_WDS: 2071 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2072 /* RA TA DA SA */ 2073 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2074 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2075 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2076 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2077 hdrlen = 30; 2078 /* 2079 * This is the exception! WDS style interfaces are prohibited 2080 * when channel contexts are in used so this must be valid 2081 */ 2082 band = local->hw.conf.chandef.chan->band; 2083 break; 2084 #ifdef CONFIG_MAC80211_MESH 2085 case NL80211_IFTYPE_MESH_POINT: 2086 if (!is_multicast_ether_addr(skb->data)) { 2087 struct sta_info *next_hop; 2088 bool mpp_lookup = true; 2089 2090 mpath = mesh_path_lookup(sdata, skb->data); 2091 if (mpath) { 2092 mpp_lookup = false; 2093 next_hop = rcu_dereference(mpath->next_hop); 2094 if (!next_hop || 2095 !(mpath->flags & (MESH_PATH_ACTIVE | 2096 MESH_PATH_RESOLVING))) 2097 mpp_lookup = true; 2098 } 2099 2100 if (mpp_lookup) 2101 mppath = mpp_path_lookup(sdata, skb->data); 2102 2103 if (mppath && mpath) 2104 mesh_path_del(mpath->sdata, mpath->dst); 2105 } 2106 2107 /* 2108 * Use address extension if it is a packet from 2109 * another interface or if we know the destination 2110 * is being proxied by a portal (i.e. portal address 2111 * differs from proxied address) 2112 */ 2113 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2114 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2115 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2116 skb->data, skb->data + ETH_ALEN); 2117 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2118 NULL, NULL); 2119 } else { 2120 /* DS -> MBSS (802.11-2012 13.11.3.3). 2121 * For unicast with unknown forwarding information, 2122 * destination might be in the MBSS or if that fails 2123 * forwarded to another mesh gate. In either case 2124 * resolution will be handled in ieee80211_xmit(), so 2125 * leave the original DA. This also works for mcast */ 2126 const u8 *mesh_da = skb->data; 2127 2128 if (mppath) 2129 mesh_da = mppath->mpp; 2130 else if (mpath) 2131 mesh_da = mpath->dst; 2132 2133 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2134 mesh_da, sdata->vif.addr); 2135 if (is_multicast_ether_addr(mesh_da)) 2136 /* DA TA mSA AE:SA */ 2137 meshhdrlen = ieee80211_new_mesh_header( 2138 sdata, &mesh_hdr, 2139 skb->data + ETH_ALEN, NULL); 2140 else 2141 /* RA TA mDA mSA AE:DA SA */ 2142 meshhdrlen = ieee80211_new_mesh_header( 2143 sdata, &mesh_hdr, skb->data, 2144 skb->data + ETH_ALEN); 2145 2146 } 2147 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2148 if (!chanctx_conf) { 2149 ret = -ENOTCONN; 2150 goto free; 2151 } 2152 band = chanctx_conf->def.chan->band; 2153 break; 2154 #endif 2155 case NL80211_IFTYPE_STATION: 2156 /* we already did checks when looking up the RA STA */ 2157 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2158 2159 if (tdls_peer) { 2160 /* DA SA BSSID */ 2161 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2162 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2163 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2164 hdrlen = 24; 2165 } else if (sdata->u.mgd.use_4addr && 2166 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2167 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2168 IEEE80211_FCTL_TODS); 2169 /* RA TA DA SA */ 2170 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2171 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2172 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2173 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2174 hdrlen = 30; 2175 } else { 2176 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2177 /* BSSID SA DA */ 2178 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2179 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2180 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2181 hdrlen = 24; 2182 } 2183 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2184 if (!chanctx_conf) { 2185 ret = -ENOTCONN; 2186 goto free; 2187 } 2188 band = chanctx_conf->def.chan->band; 2189 break; 2190 case NL80211_IFTYPE_OCB: 2191 /* DA SA BSSID */ 2192 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2193 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2194 eth_broadcast_addr(hdr.addr3); 2195 hdrlen = 24; 2196 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2197 if (!chanctx_conf) { 2198 ret = -ENOTCONN; 2199 goto free; 2200 } 2201 band = chanctx_conf->def.chan->band; 2202 break; 2203 case NL80211_IFTYPE_ADHOC: 2204 /* DA SA BSSID */ 2205 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2206 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2207 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2208 hdrlen = 24; 2209 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2210 if (!chanctx_conf) { 2211 ret = -ENOTCONN; 2212 goto free; 2213 } 2214 band = chanctx_conf->def.chan->band; 2215 break; 2216 default: 2217 ret = -EINVAL; 2218 goto free; 2219 } 2220 2221 multicast = is_multicast_ether_addr(hdr.addr1); 2222 2223 /* sta is always NULL for mesh */ 2224 if (sta) { 2225 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2226 wme_sta = sta->sta.wme; 2227 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2228 /* For mesh, the use of the QoS header is mandatory */ 2229 wme_sta = true; 2230 } 2231 2232 /* receiver does QoS (which also means we do) use it */ 2233 if (wme_sta) { 2234 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2235 hdrlen += 2; 2236 } 2237 2238 /* 2239 * Drop unicast frames to unauthorised stations unless they are 2240 * EAPOL frames from the local station. 2241 */ 2242 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2243 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2244 !multicast && !authorized && 2245 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2246 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2247 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2248 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2249 sdata->name, hdr.addr1); 2250 #endif 2251 2252 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2253 2254 ret = -EPERM; 2255 goto free; 2256 } 2257 2258 if (unlikely(!multicast && skb->sk && 2259 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2260 struct sk_buff *ack_skb = skb_clone_sk(skb); 2261 2262 if (ack_skb) { 2263 unsigned long flags; 2264 int id; 2265 2266 spin_lock_irqsave(&local->ack_status_lock, flags); 2267 id = idr_alloc(&local->ack_status_frames, ack_skb, 2268 1, 0x10000, GFP_ATOMIC); 2269 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2270 2271 if (id >= 0) { 2272 info_id = id; 2273 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2274 } else { 2275 kfree_skb(ack_skb); 2276 } 2277 } 2278 } 2279 2280 /* 2281 * If the skb is shared we need to obtain our own copy. 2282 */ 2283 if (skb_shared(skb)) { 2284 struct sk_buff *tmp_skb = skb; 2285 2286 /* can't happen -- skb is a clone if info_id != 0 */ 2287 WARN_ON(info_id); 2288 2289 skb = skb_clone(skb, GFP_ATOMIC); 2290 kfree_skb(tmp_skb); 2291 2292 if (!skb) { 2293 ret = -ENOMEM; 2294 goto free; 2295 } 2296 } 2297 2298 hdr.frame_control = fc; 2299 hdr.duration_id = 0; 2300 hdr.seq_ctrl = 0; 2301 2302 skip_header_bytes = ETH_HLEN; 2303 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2304 encaps_data = bridge_tunnel_header; 2305 encaps_len = sizeof(bridge_tunnel_header); 2306 skip_header_bytes -= 2; 2307 } else if (ethertype >= ETH_P_802_3_MIN) { 2308 encaps_data = rfc1042_header; 2309 encaps_len = sizeof(rfc1042_header); 2310 skip_header_bytes -= 2; 2311 } else { 2312 encaps_data = NULL; 2313 encaps_len = 0; 2314 } 2315 2316 nh_pos = skb_network_header(skb) - skb->data; 2317 h_pos = skb_transport_header(skb) - skb->data; 2318 2319 skb_pull(skb, skip_header_bytes); 2320 nh_pos -= skip_header_bytes; 2321 h_pos -= skip_header_bytes; 2322 2323 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2324 2325 /* 2326 * So we need to modify the skb header and hence need a copy of 2327 * that. The head_need variable above doesn't, so far, include 2328 * the needed header space that we don't need right away. If we 2329 * can, then we don't reallocate right now but only after the 2330 * frame arrives at the master device (if it does...) 2331 * 2332 * If we cannot, however, then we will reallocate to include all 2333 * the ever needed space. Also, if we need to reallocate it anyway, 2334 * make it big enough for everything we may ever need. 2335 */ 2336 2337 if (head_need > 0 || skb_cloned(skb)) { 2338 head_need += sdata->encrypt_headroom; 2339 head_need += local->tx_headroom; 2340 head_need = max_t(int, 0, head_need); 2341 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2342 ieee80211_free_txskb(&local->hw, skb); 2343 skb = NULL; 2344 return ERR_PTR(-ENOMEM); 2345 } 2346 } 2347 2348 if (encaps_data) { 2349 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2350 nh_pos += encaps_len; 2351 h_pos += encaps_len; 2352 } 2353 2354 #ifdef CONFIG_MAC80211_MESH 2355 if (meshhdrlen > 0) { 2356 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2357 nh_pos += meshhdrlen; 2358 h_pos += meshhdrlen; 2359 } 2360 #endif 2361 2362 if (ieee80211_is_data_qos(fc)) { 2363 __le16 *qos_control; 2364 2365 qos_control = (__le16 *) skb_push(skb, 2); 2366 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2367 /* 2368 * Maybe we could actually set some fields here, for now just 2369 * initialise to zero to indicate no special operation. 2370 */ 2371 *qos_control = 0; 2372 } else 2373 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2374 2375 nh_pos += hdrlen; 2376 h_pos += hdrlen; 2377 2378 /* Update skb pointers to various headers since this modified frame 2379 * is going to go through Linux networking code that may potentially 2380 * need things like pointer to IP header. */ 2381 skb_set_mac_header(skb, 0); 2382 skb_set_network_header(skb, nh_pos); 2383 skb_set_transport_header(skb, h_pos); 2384 2385 info = IEEE80211_SKB_CB(skb); 2386 memset(info, 0, sizeof(*info)); 2387 2388 info->flags = info_flags; 2389 info->ack_frame_id = info_id; 2390 info->band = band; 2391 2392 return skb; 2393 free: 2394 kfree_skb(skb); 2395 return ERR_PTR(ret); 2396 } 2397 2398 /* 2399 * fast-xmit overview 2400 * 2401 * The core idea of this fast-xmit is to remove per-packet checks by checking 2402 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2403 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2404 * much less work can be done per packet. For example, fragmentation must be 2405 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2406 * in the code here. 2407 * 2408 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2409 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2410 * 2411 * The most difficult part of this is that when any of these assumptions 2412 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2413 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2414 * since the per-packet code no longer checks the conditions. This is reflected 2415 * by the calls to these functions throughout the rest of the code, and must be 2416 * maintained if any of the TX path checks change. 2417 */ 2418 2419 void ieee80211_check_fast_xmit(struct sta_info *sta) 2420 { 2421 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2422 struct ieee80211_local *local = sta->local; 2423 struct ieee80211_sub_if_data *sdata = sta->sdata; 2424 struct ieee80211_hdr *hdr = (void *)build.hdr; 2425 struct ieee80211_chanctx_conf *chanctx_conf; 2426 __le16 fc; 2427 2428 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2429 return; 2430 2431 /* Locking here protects both the pointer itself, and against concurrent 2432 * invocations winning data access races to, e.g., the key pointer that 2433 * is used. 2434 * Without it, the invocation of this function right after the key 2435 * pointer changes wouldn't be sufficient, as another CPU could access 2436 * the pointer, then stall, and then do the cache update after the CPU 2437 * that invalidated the key. 2438 * With the locking, such scenarios cannot happen as the check for the 2439 * key and the fast-tx assignment are done atomically, so the CPU that 2440 * modifies the key will either wait or other one will see the key 2441 * cleared/changed already. 2442 */ 2443 spin_lock_bh(&sta->lock); 2444 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2445 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2446 sdata->vif.type == NL80211_IFTYPE_STATION) 2447 goto out; 2448 2449 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2450 goto out; 2451 2452 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2453 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2454 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) 2455 goto out; 2456 2457 if (sdata->noack_map) 2458 goto out; 2459 2460 /* fast-xmit doesn't handle fragmentation at all */ 2461 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2462 !local->ops->set_frag_threshold) 2463 goto out; 2464 2465 rcu_read_lock(); 2466 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2467 if (!chanctx_conf) { 2468 rcu_read_unlock(); 2469 goto out; 2470 } 2471 build.band = chanctx_conf->def.chan->band; 2472 rcu_read_unlock(); 2473 2474 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2475 2476 switch (sdata->vif.type) { 2477 case NL80211_IFTYPE_ADHOC: 2478 /* DA SA BSSID */ 2479 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2480 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2481 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2482 build.hdr_len = 24; 2483 break; 2484 case NL80211_IFTYPE_STATION: 2485 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2486 /* DA SA BSSID */ 2487 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2488 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2489 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2490 build.hdr_len = 24; 2491 break; 2492 } 2493 2494 if (sdata->u.mgd.use_4addr) { 2495 /* non-regular ethertype cannot use the fastpath */ 2496 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2497 IEEE80211_FCTL_TODS); 2498 /* RA TA DA SA */ 2499 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2500 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2501 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2502 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2503 build.hdr_len = 30; 2504 break; 2505 } 2506 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2507 /* BSSID SA DA */ 2508 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2509 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2510 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2511 build.hdr_len = 24; 2512 break; 2513 case NL80211_IFTYPE_AP_VLAN: 2514 if (sdata->wdev.use_4addr) { 2515 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2516 IEEE80211_FCTL_TODS); 2517 /* RA TA DA SA */ 2518 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2519 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2520 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2521 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2522 build.hdr_len = 30; 2523 break; 2524 } 2525 /* fall through */ 2526 case NL80211_IFTYPE_AP: 2527 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2528 /* DA BSSID SA */ 2529 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2530 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2531 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2532 build.hdr_len = 24; 2533 break; 2534 default: 2535 /* not handled on fast-xmit */ 2536 goto out; 2537 } 2538 2539 if (sta->sta.wme) { 2540 build.hdr_len += 2; 2541 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2542 } 2543 2544 /* We store the key here so there's no point in using rcu_dereference() 2545 * but that's fine because the code that changes the pointers will call 2546 * this function after doing so. For a single CPU that would be enough, 2547 * for multiple see the comment above. 2548 */ 2549 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2550 if (!build.key) 2551 build.key = rcu_access_pointer(sdata->default_unicast_key); 2552 if (build.key) { 2553 bool gen_iv, iv_spc, mmic; 2554 2555 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2556 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2557 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2558 2559 /* don't handle software crypto */ 2560 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2561 goto out; 2562 2563 switch (build.key->conf.cipher) { 2564 case WLAN_CIPHER_SUITE_CCMP: 2565 case WLAN_CIPHER_SUITE_CCMP_256: 2566 /* add fixed key ID */ 2567 if (gen_iv) { 2568 (build.hdr + build.hdr_len)[3] = 2569 0x20 | (build.key->conf.keyidx << 6); 2570 build.pn_offs = build.hdr_len; 2571 } 2572 if (gen_iv || iv_spc) 2573 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2574 break; 2575 case WLAN_CIPHER_SUITE_GCMP: 2576 case WLAN_CIPHER_SUITE_GCMP_256: 2577 /* add fixed key ID */ 2578 if (gen_iv) { 2579 (build.hdr + build.hdr_len)[3] = 2580 0x20 | (build.key->conf.keyidx << 6); 2581 build.pn_offs = build.hdr_len; 2582 } 2583 if (gen_iv || iv_spc) 2584 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2585 break; 2586 case WLAN_CIPHER_SUITE_TKIP: 2587 /* cannot handle MMIC or IV generation in xmit-fast */ 2588 if (mmic || gen_iv) 2589 goto out; 2590 if (iv_spc) 2591 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2592 break; 2593 case WLAN_CIPHER_SUITE_WEP40: 2594 case WLAN_CIPHER_SUITE_WEP104: 2595 /* cannot handle IV generation in fast-xmit */ 2596 if (gen_iv) 2597 goto out; 2598 if (iv_spc) 2599 build.hdr_len += IEEE80211_WEP_IV_LEN; 2600 break; 2601 case WLAN_CIPHER_SUITE_AES_CMAC: 2602 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2603 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2604 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2605 WARN(1, 2606 "management cipher suite 0x%x enabled for data\n", 2607 build.key->conf.cipher); 2608 goto out; 2609 default: 2610 /* we don't know how to generate IVs for this at all */ 2611 if (WARN_ON(gen_iv)) 2612 goto out; 2613 /* pure hardware keys are OK, of course */ 2614 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2615 break; 2616 /* cipher scheme might require space allocation */ 2617 if (iv_spc && 2618 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2619 goto out; 2620 if (iv_spc) 2621 build.hdr_len += build.key->conf.iv_len; 2622 } 2623 2624 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2625 } 2626 2627 hdr->frame_control = fc; 2628 2629 memcpy(build.hdr + build.hdr_len, 2630 rfc1042_header, sizeof(rfc1042_header)); 2631 build.hdr_len += sizeof(rfc1042_header); 2632 2633 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2634 /* if the kmemdup fails, continue w/o fast_tx */ 2635 if (!fast_tx) 2636 goto out; 2637 2638 out: 2639 /* we might have raced against another call to this function */ 2640 old = rcu_dereference_protected(sta->fast_tx, 2641 lockdep_is_held(&sta->lock)); 2642 rcu_assign_pointer(sta->fast_tx, fast_tx); 2643 if (old) 2644 kfree_rcu(old, rcu_head); 2645 spin_unlock_bh(&sta->lock); 2646 } 2647 2648 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2649 { 2650 struct sta_info *sta; 2651 2652 rcu_read_lock(); 2653 list_for_each_entry_rcu(sta, &local->sta_list, list) 2654 ieee80211_check_fast_xmit(sta); 2655 rcu_read_unlock(); 2656 } 2657 2658 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2659 { 2660 struct ieee80211_local *local = sdata->local; 2661 struct sta_info *sta; 2662 2663 rcu_read_lock(); 2664 2665 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2666 if (sdata != sta->sdata && 2667 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2668 continue; 2669 ieee80211_check_fast_xmit(sta); 2670 } 2671 2672 rcu_read_unlock(); 2673 } 2674 2675 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2676 { 2677 struct ieee80211_fast_tx *fast_tx; 2678 2679 spin_lock_bh(&sta->lock); 2680 fast_tx = rcu_dereference_protected(sta->fast_tx, 2681 lockdep_is_held(&sta->lock)); 2682 RCU_INIT_POINTER(sta->fast_tx, NULL); 2683 spin_unlock_bh(&sta->lock); 2684 2685 if (fast_tx) 2686 kfree_rcu(fast_tx, rcu_head); 2687 } 2688 2689 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2690 struct net_device *dev, struct sta_info *sta, 2691 struct ieee80211_fast_tx *fast_tx, 2692 struct sk_buff *skb) 2693 { 2694 struct ieee80211_local *local = sdata->local; 2695 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2696 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2697 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2698 struct ethhdr eth; 2699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2700 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2701 struct ieee80211_tx_data tx; 2702 ieee80211_tx_result r; 2703 struct tid_ampdu_tx *tid_tx = NULL; 2704 u8 tid = IEEE80211_NUM_TIDS; 2705 2706 /* control port protocol needs a lot of special handling */ 2707 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2708 return false; 2709 2710 /* only RFC 1042 SNAP */ 2711 if (ethertype < ETH_P_802_3_MIN) 2712 return false; 2713 2714 /* don't handle TX status request here either */ 2715 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2716 return false; 2717 2718 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2719 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2720 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2721 if (tid_tx) { 2722 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2723 return false; 2724 if (tid_tx->timeout) 2725 tid_tx->last_tx = jiffies; 2726 } 2727 } 2728 2729 /* after this point (skb is modified) we cannot return false */ 2730 2731 if (skb_shared(skb)) { 2732 struct sk_buff *tmp_skb = skb; 2733 2734 skb = skb_clone(skb, GFP_ATOMIC); 2735 kfree_skb(tmp_skb); 2736 2737 if (!skb) 2738 return true; 2739 } 2740 2741 ieee80211_tx_stats(dev, skb->len + extra_head); 2742 2743 /* will not be crypto-handled beyond what we do here, so use false 2744 * as the may-encrypt argument for the resize to not account for 2745 * more room than we already have in 'extra_head' 2746 */ 2747 if (unlikely(ieee80211_skb_resize(sdata, skb, 2748 max_t(int, extra_head + hw_headroom - 2749 skb_headroom(skb), 0), 2750 false))) { 2751 kfree_skb(skb); 2752 return true; 2753 } 2754 2755 memcpy(ð, skb->data, ETH_HLEN - 2); 2756 hdr = (void *)skb_push(skb, extra_head); 2757 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 2758 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 2759 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 2760 2761 memset(info, 0, sizeof(*info)); 2762 info->band = fast_tx->band; 2763 info->control.vif = &sdata->vif; 2764 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 2765 IEEE80211_TX_CTL_DONTFRAG | 2766 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 2767 2768 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2769 *ieee80211_get_qos_ctl(hdr) = tid; 2770 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 2771 } else { 2772 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2773 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 2774 sdata->sequence_number += 0x10; 2775 } 2776 2777 if (skb_shinfo(skb)->gso_size) 2778 sta->tx_msdu[tid] += 2779 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 2780 else 2781 sta->tx_msdu[tid]++; 2782 2783 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2784 2785 __skb_queue_head_init(&tx.skbs); 2786 2787 tx.flags = IEEE80211_TX_UNICAST; 2788 tx.local = local; 2789 tx.sdata = sdata; 2790 tx.sta = sta; 2791 tx.key = fast_tx->key; 2792 2793 if (fast_tx->key) 2794 info->control.hw_key = &fast_tx->key->conf; 2795 2796 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 2797 tx.skb = skb; 2798 r = ieee80211_tx_h_rate_ctrl(&tx); 2799 skb = tx.skb; 2800 tx.skb = NULL; 2801 2802 if (r != TX_CONTINUE) { 2803 if (r != TX_QUEUED) 2804 kfree_skb(skb); 2805 return true; 2806 } 2807 } 2808 2809 /* statistics normally done by ieee80211_tx_h_stats (but that 2810 * has to consider fragmentation, so is more complex) 2811 */ 2812 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len; 2813 sta->tx_packets[skb_get_queue_mapping(skb)]++; 2814 2815 if (fast_tx->pn_offs) { 2816 u64 pn; 2817 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 2818 2819 switch (fast_tx->key->conf.cipher) { 2820 case WLAN_CIPHER_SUITE_CCMP: 2821 case WLAN_CIPHER_SUITE_CCMP_256: 2822 case WLAN_CIPHER_SUITE_GCMP: 2823 case WLAN_CIPHER_SUITE_GCMP_256: 2824 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 2825 crypto_hdr[0] = pn; 2826 crypto_hdr[1] = pn >> 8; 2827 crypto_hdr[4] = pn >> 16; 2828 crypto_hdr[5] = pn >> 24; 2829 crypto_hdr[6] = pn >> 32; 2830 crypto_hdr[7] = pn >> 40; 2831 break; 2832 } 2833 } 2834 2835 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2836 sdata = container_of(sdata->bss, 2837 struct ieee80211_sub_if_data, u.ap); 2838 2839 __skb_queue_tail(&tx.skbs, skb); 2840 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 2841 return true; 2842 } 2843 2844 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 2845 struct net_device *dev, 2846 u32 info_flags) 2847 { 2848 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2849 struct sta_info *sta; 2850 struct sk_buff *next; 2851 2852 if (unlikely(skb->len < ETH_HLEN)) { 2853 kfree_skb(skb); 2854 return; 2855 } 2856 2857 rcu_read_lock(); 2858 2859 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 2860 goto out_free; 2861 2862 if (!IS_ERR_OR_NULL(sta)) { 2863 struct ieee80211_fast_tx *fast_tx; 2864 2865 fast_tx = rcu_dereference(sta->fast_tx); 2866 2867 if (fast_tx && 2868 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 2869 goto out; 2870 } 2871 2872 if (skb_is_gso(skb)) { 2873 struct sk_buff *segs; 2874 2875 segs = skb_gso_segment(skb, 0); 2876 if (IS_ERR(segs)) { 2877 goto out_free; 2878 } else if (segs) { 2879 consume_skb(skb); 2880 skb = segs; 2881 } 2882 } else { 2883 /* we cannot process non-linear frames on this path */ 2884 if (skb_linearize(skb)) { 2885 kfree_skb(skb); 2886 goto out; 2887 } 2888 2889 /* the frame could be fragmented, software-encrypted, and other 2890 * things so we cannot really handle checksum offload with it - 2891 * fix it up in software before we handle anything else. 2892 */ 2893 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2894 skb_set_transport_header(skb, 2895 skb_checksum_start_offset(skb)); 2896 if (skb_checksum_help(skb)) 2897 goto out_free; 2898 } 2899 } 2900 2901 next = skb; 2902 while (next) { 2903 skb = next; 2904 next = skb->next; 2905 2906 skb->prev = NULL; 2907 skb->next = NULL; 2908 2909 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2910 if (IS_ERR(skb)) 2911 goto out; 2912 2913 ieee80211_tx_stats(dev, skb->len); 2914 2915 ieee80211_xmit(sdata, sta, skb); 2916 } 2917 goto out; 2918 out_free: 2919 kfree_skb(skb); 2920 out: 2921 rcu_read_unlock(); 2922 } 2923 2924 /** 2925 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 2926 * @skb: packet to be sent 2927 * @dev: incoming interface 2928 * 2929 * On failure skb will be freed. 2930 */ 2931 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 2932 struct net_device *dev) 2933 { 2934 __ieee80211_subif_start_xmit(skb, dev, 0); 2935 return NETDEV_TX_OK; 2936 } 2937 2938 struct sk_buff * 2939 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 2940 struct sk_buff *skb, u32 info_flags) 2941 { 2942 struct ieee80211_hdr *hdr; 2943 struct ieee80211_tx_data tx = { 2944 .local = sdata->local, 2945 .sdata = sdata, 2946 }; 2947 struct sta_info *sta; 2948 2949 rcu_read_lock(); 2950 2951 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 2952 kfree_skb(skb); 2953 skb = ERR_PTR(-EINVAL); 2954 goto out; 2955 } 2956 2957 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2958 if (IS_ERR(skb)) 2959 goto out; 2960 2961 hdr = (void *)skb->data; 2962 tx.sta = sta_info_get(sdata, hdr->addr1); 2963 tx.skb = skb; 2964 2965 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 2966 rcu_read_unlock(); 2967 kfree_skb(skb); 2968 return ERR_PTR(-EINVAL); 2969 } 2970 2971 out: 2972 rcu_read_unlock(); 2973 return skb; 2974 } 2975 2976 /* 2977 * ieee80211_clear_tx_pending may not be called in a context where 2978 * it is possible that it packets could come in again. 2979 */ 2980 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2981 { 2982 struct sk_buff *skb; 2983 int i; 2984 2985 for (i = 0; i < local->hw.queues; i++) { 2986 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2987 ieee80211_free_txskb(&local->hw, skb); 2988 } 2989 } 2990 2991 /* 2992 * Returns false if the frame couldn't be transmitted but was queued instead, 2993 * which in this case means re-queued -- take as an indication to stop sending 2994 * more pending frames. 2995 */ 2996 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2997 struct sk_buff *skb) 2998 { 2999 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3000 struct ieee80211_sub_if_data *sdata; 3001 struct sta_info *sta; 3002 struct ieee80211_hdr *hdr; 3003 bool result; 3004 struct ieee80211_chanctx_conf *chanctx_conf; 3005 3006 sdata = vif_to_sdata(info->control.vif); 3007 3008 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3009 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3010 if (unlikely(!chanctx_conf)) { 3011 dev_kfree_skb(skb); 3012 return true; 3013 } 3014 info->band = chanctx_conf->def.chan->band; 3015 result = ieee80211_tx(sdata, NULL, skb, true); 3016 } else { 3017 struct sk_buff_head skbs; 3018 3019 __skb_queue_head_init(&skbs); 3020 __skb_queue_tail(&skbs, skb); 3021 3022 hdr = (struct ieee80211_hdr *)skb->data; 3023 sta = sta_info_get(sdata, hdr->addr1); 3024 3025 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3026 } 3027 3028 return result; 3029 } 3030 3031 /* 3032 * Transmit all pending packets. Called from tasklet. 3033 */ 3034 void ieee80211_tx_pending(unsigned long data) 3035 { 3036 struct ieee80211_local *local = (struct ieee80211_local *)data; 3037 unsigned long flags; 3038 int i; 3039 bool txok; 3040 3041 rcu_read_lock(); 3042 3043 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3044 for (i = 0; i < local->hw.queues; i++) { 3045 /* 3046 * If queue is stopped by something other than due to pending 3047 * frames, or we have no pending frames, proceed to next queue. 3048 */ 3049 if (local->queue_stop_reasons[i] || 3050 skb_queue_empty(&local->pending[i])) 3051 continue; 3052 3053 while (!skb_queue_empty(&local->pending[i])) { 3054 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3055 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3056 3057 if (WARN_ON(!info->control.vif)) { 3058 ieee80211_free_txskb(&local->hw, skb); 3059 continue; 3060 } 3061 3062 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3063 flags); 3064 3065 txok = ieee80211_tx_pending_skb(local, skb); 3066 spin_lock_irqsave(&local->queue_stop_reason_lock, 3067 flags); 3068 if (!txok) 3069 break; 3070 } 3071 3072 if (skb_queue_empty(&local->pending[i])) 3073 ieee80211_propagate_queue_wake(local, i); 3074 } 3075 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3076 3077 rcu_read_unlock(); 3078 } 3079 3080 /* functions for drivers to get certain frames */ 3081 3082 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3083 struct ps_data *ps, struct sk_buff *skb, 3084 bool is_template) 3085 { 3086 u8 *pos, *tim; 3087 int aid0 = 0; 3088 int i, have_bits = 0, n1, n2; 3089 3090 /* Generate bitmap for TIM only if there are any STAs in power save 3091 * mode. */ 3092 if (atomic_read(&ps->num_sta_ps) > 0) 3093 /* in the hope that this is faster than 3094 * checking byte-for-byte */ 3095 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3096 IEEE80211_MAX_AID+1); 3097 if (!is_template) { 3098 if (ps->dtim_count == 0) 3099 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3100 else 3101 ps->dtim_count--; 3102 } 3103 3104 tim = pos = (u8 *) skb_put(skb, 6); 3105 *pos++ = WLAN_EID_TIM; 3106 *pos++ = 4; 3107 *pos++ = ps->dtim_count; 3108 *pos++ = sdata->vif.bss_conf.dtim_period; 3109 3110 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3111 aid0 = 1; 3112 3113 ps->dtim_bc_mc = aid0 == 1; 3114 3115 if (have_bits) { 3116 /* Find largest even number N1 so that bits numbered 1 through 3117 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3118 * (N2 + 1) x 8 through 2007 are 0. */ 3119 n1 = 0; 3120 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3121 if (ps->tim[i]) { 3122 n1 = i & 0xfe; 3123 break; 3124 } 3125 } 3126 n2 = n1; 3127 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3128 if (ps->tim[i]) { 3129 n2 = i; 3130 break; 3131 } 3132 } 3133 3134 /* Bitmap control */ 3135 *pos++ = n1 | aid0; 3136 /* Part Virt Bitmap */ 3137 skb_put(skb, n2 - n1); 3138 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3139 3140 tim[1] = n2 - n1 + 4; 3141 } else { 3142 *pos++ = aid0; /* Bitmap control */ 3143 *pos++ = 0; /* Part Virt Bitmap */ 3144 } 3145 } 3146 3147 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3148 struct ps_data *ps, struct sk_buff *skb, 3149 bool is_template) 3150 { 3151 struct ieee80211_local *local = sdata->local; 3152 3153 /* 3154 * Not very nice, but we want to allow the driver to call 3155 * ieee80211_beacon_get() as a response to the set_tim() 3156 * callback. That, however, is already invoked under the 3157 * sta_lock to guarantee consistent and race-free update 3158 * of the tim bitmap in mac80211 and the driver. 3159 */ 3160 if (local->tim_in_locked_section) { 3161 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3162 } else { 3163 spin_lock_bh(&local->tim_lock); 3164 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3165 spin_unlock_bh(&local->tim_lock); 3166 } 3167 3168 return 0; 3169 } 3170 3171 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3172 struct beacon_data *beacon) 3173 { 3174 struct probe_resp *resp; 3175 u8 *beacon_data; 3176 size_t beacon_data_len; 3177 int i; 3178 u8 count = beacon->csa_current_counter; 3179 3180 switch (sdata->vif.type) { 3181 case NL80211_IFTYPE_AP: 3182 beacon_data = beacon->tail; 3183 beacon_data_len = beacon->tail_len; 3184 break; 3185 case NL80211_IFTYPE_ADHOC: 3186 beacon_data = beacon->head; 3187 beacon_data_len = beacon->head_len; 3188 break; 3189 case NL80211_IFTYPE_MESH_POINT: 3190 beacon_data = beacon->head; 3191 beacon_data_len = beacon->head_len; 3192 break; 3193 default: 3194 return; 3195 } 3196 3197 rcu_read_lock(); 3198 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3199 resp = rcu_dereference(sdata->u.ap.probe_resp); 3200 3201 if (beacon->csa_counter_offsets[i]) { 3202 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3203 beacon_data_len)) { 3204 rcu_read_unlock(); 3205 return; 3206 } 3207 3208 beacon_data[beacon->csa_counter_offsets[i]] = count; 3209 } 3210 3211 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3212 resp->data[resp->csa_counter_offsets[i]] = count; 3213 } 3214 rcu_read_unlock(); 3215 } 3216 3217 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3218 { 3219 beacon->csa_current_counter--; 3220 3221 /* the counter should never reach 0 */ 3222 WARN_ON_ONCE(!beacon->csa_current_counter); 3223 3224 return beacon->csa_current_counter; 3225 } 3226 3227 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3228 { 3229 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3230 struct beacon_data *beacon = NULL; 3231 u8 count = 0; 3232 3233 rcu_read_lock(); 3234 3235 if (sdata->vif.type == NL80211_IFTYPE_AP) 3236 beacon = rcu_dereference(sdata->u.ap.beacon); 3237 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3238 beacon = rcu_dereference(sdata->u.ibss.presp); 3239 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3240 beacon = rcu_dereference(sdata->u.mesh.beacon); 3241 3242 if (!beacon) 3243 goto unlock; 3244 3245 count = __ieee80211_csa_update_counter(beacon); 3246 3247 unlock: 3248 rcu_read_unlock(); 3249 return count; 3250 } 3251 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3252 3253 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3254 { 3255 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3256 struct beacon_data *beacon = NULL; 3257 u8 *beacon_data; 3258 size_t beacon_data_len; 3259 int ret = false; 3260 3261 if (!ieee80211_sdata_running(sdata)) 3262 return false; 3263 3264 rcu_read_lock(); 3265 if (vif->type == NL80211_IFTYPE_AP) { 3266 struct ieee80211_if_ap *ap = &sdata->u.ap; 3267 3268 beacon = rcu_dereference(ap->beacon); 3269 if (WARN_ON(!beacon || !beacon->tail)) 3270 goto out; 3271 beacon_data = beacon->tail; 3272 beacon_data_len = beacon->tail_len; 3273 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3274 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3275 3276 beacon = rcu_dereference(ifibss->presp); 3277 if (!beacon) 3278 goto out; 3279 3280 beacon_data = beacon->head; 3281 beacon_data_len = beacon->head_len; 3282 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3283 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3284 3285 beacon = rcu_dereference(ifmsh->beacon); 3286 if (!beacon) 3287 goto out; 3288 3289 beacon_data = beacon->head; 3290 beacon_data_len = beacon->head_len; 3291 } else { 3292 WARN_ON(1); 3293 goto out; 3294 } 3295 3296 if (!beacon->csa_counter_offsets[0]) 3297 goto out; 3298 3299 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3300 goto out; 3301 3302 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3303 ret = true; 3304 out: 3305 rcu_read_unlock(); 3306 3307 return ret; 3308 } 3309 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3310 3311 static struct sk_buff * 3312 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3313 struct ieee80211_vif *vif, 3314 struct ieee80211_mutable_offsets *offs, 3315 bool is_template) 3316 { 3317 struct ieee80211_local *local = hw_to_local(hw); 3318 struct beacon_data *beacon = NULL; 3319 struct sk_buff *skb = NULL; 3320 struct ieee80211_tx_info *info; 3321 struct ieee80211_sub_if_data *sdata = NULL; 3322 enum ieee80211_band band; 3323 struct ieee80211_tx_rate_control txrc; 3324 struct ieee80211_chanctx_conf *chanctx_conf; 3325 int csa_off_base = 0; 3326 3327 rcu_read_lock(); 3328 3329 sdata = vif_to_sdata(vif); 3330 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3331 3332 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3333 goto out; 3334 3335 if (offs) 3336 memset(offs, 0, sizeof(*offs)); 3337 3338 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3339 struct ieee80211_if_ap *ap = &sdata->u.ap; 3340 3341 beacon = rcu_dereference(ap->beacon); 3342 if (beacon) { 3343 if (beacon->csa_counter_offsets[0]) { 3344 if (!is_template) 3345 __ieee80211_csa_update_counter(beacon); 3346 3347 ieee80211_set_csa(sdata, beacon); 3348 } 3349 3350 /* 3351 * headroom, head length, 3352 * tail length and maximum TIM length 3353 */ 3354 skb = dev_alloc_skb(local->tx_headroom + 3355 beacon->head_len + 3356 beacon->tail_len + 256 + 3357 local->hw.extra_beacon_tailroom); 3358 if (!skb) 3359 goto out; 3360 3361 skb_reserve(skb, local->tx_headroom); 3362 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3363 beacon->head_len); 3364 3365 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3366 is_template); 3367 3368 if (offs) { 3369 offs->tim_offset = beacon->head_len; 3370 offs->tim_length = skb->len - beacon->head_len; 3371 3372 /* for AP the csa offsets are from tail */ 3373 csa_off_base = skb->len; 3374 } 3375 3376 if (beacon->tail) 3377 memcpy(skb_put(skb, beacon->tail_len), 3378 beacon->tail, beacon->tail_len); 3379 } else 3380 goto out; 3381 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3382 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3383 struct ieee80211_hdr *hdr; 3384 3385 beacon = rcu_dereference(ifibss->presp); 3386 if (!beacon) 3387 goto out; 3388 3389 if (beacon->csa_counter_offsets[0]) { 3390 if (!is_template) 3391 __ieee80211_csa_update_counter(beacon); 3392 3393 ieee80211_set_csa(sdata, beacon); 3394 } 3395 3396 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3397 local->hw.extra_beacon_tailroom); 3398 if (!skb) 3399 goto out; 3400 skb_reserve(skb, local->tx_headroom); 3401 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3402 beacon->head_len); 3403 3404 hdr = (struct ieee80211_hdr *) skb->data; 3405 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3406 IEEE80211_STYPE_BEACON); 3407 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3408 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3409 3410 beacon = rcu_dereference(ifmsh->beacon); 3411 if (!beacon) 3412 goto out; 3413 3414 if (beacon->csa_counter_offsets[0]) { 3415 if (!is_template) 3416 /* TODO: For mesh csa_counter is in TU, so 3417 * decrementing it by one isn't correct, but 3418 * for now we leave it consistent with overall 3419 * mac80211's behavior. 3420 */ 3421 __ieee80211_csa_update_counter(beacon); 3422 3423 ieee80211_set_csa(sdata, beacon); 3424 } 3425 3426 if (ifmsh->sync_ops) 3427 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3428 3429 skb = dev_alloc_skb(local->tx_headroom + 3430 beacon->head_len + 3431 256 + /* TIM IE */ 3432 beacon->tail_len + 3433 local->hw.extra_beacon_tailroom); 3434 if (!skb) 3435 goto out; 3436 skb_reserve(skb, local->tx_headroom); 3437 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3438 beacon->head_len); 3439 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3440 3441 if (offs) { 3442 offs->tim_offset = beacon->head_len; 3443 offs->tim_length = skb->len - beacon->head_len; 3444 } 3445 3446 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3447 beacon->tail_len); 3448 } else { 3449 WARN_ON(1); 3450 goto out; 3451 } 3452 3453 /* CSA offsets */ 3454 if (offs && beacon) { 3455 int i; 3456 3457 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3458 u16 csa_off = beacon->csa_counter_offsets[i]; 3459 3460 if (!csa_off) 3461 continue; 3462 3463 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3464 } 3465 } 3466 3467 band = chanctx_conf->def.chan->band; 3468 3469 info = IEEE80211_SKB_CB(skb); 3470 3471 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3472 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3473 info->band = band; 3474 3475 memset(&txrc, 0, sizeof(txrc)); 3476 txrc.hw = hw; 3477 txrc.sband = local->hw.wiphy->bands[band]; 3478 txrc.bss_conf = &sdata->vif.bss_conf; 3479 txrc.skb = skb; 3480 txrc.reported_rate.idx = -1; 3481 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3482 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3483 txrc.max_rate_idx = -1; 3484 else 3485 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3486 txrc.bss = true; 3487 rate_control_get_rate(sdata, NULL, &txrc); 3488 3489 info->control.vif = vif; 3490 3491 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3492 IEEE80211_TX_CTL_ASSIGN_SEQ | 3493 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3494 out: 3495 rcu_read_unlock(); 3496 return skb; 3497 3498 } 3499 3500 struct sk_buff * 3501 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3502 struct ieee80211_vif *vif, 3503 struct ieee80211_mutable_offsets *offs) 3504 { 3505 return __ieee80211_beacon_get(hw, vif, offs, true); 3506 } 3507 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3508 3509 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3510 struct ieee80211_vif *vif, 3511 u16 *tim_offset, u16 *tim_length) 3512 { 3513 struct ieee80211_mutable_offsets offs = {}; 3514 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3515 3516 if (tim_offset) 3517 *tim_offset = offs.tim_offset; 3518 3519 if (tim_length) 3520 *tim_length = offs.tim_length; 3521 3522 return bcn; 3523 } 3524 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3525 3526 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3527 struct ieee80211_vif *vif) 3528 { 3529 struct ieee80211_if_ap *ap = NULL; 3530 struct sk_buff *skb = NULL; 3531 struct probe_resp *presp = NULL; 3532 struct ieee80211_hdr *hdr; 3533 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3534 3535 if (sdata->vif.type != NL80211_IFTYPE_AP) 3536 return NULL; 3537 3538 rcu_read_lock(); 3539 3540 ap = &sdata->u.ap; 3541 presp = rcu_dereference(ap->probe_resp); 3542 if (!presp) 3543 goto out; 3544 3545 skb = dev_alloc_skb(presp->len); 3546 if (!skb) 3547 goto out; 3548 3549 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3550 3551 hdr = (struct ieee80211_hdr *) skb->data; 3552 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3553 3554 out: 3555 rcu_read_unlock(); 3556 return skb; 3557 } 3558 EXPORT_SYMBOL(ieee80211_proberesp_get); 3559 3560 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3561 struct ieee80211_vif *vif) 3562 { 3563 struct ieee80211_sub_if_data *sdata; 3564 struct ieee80211_if_managed *ifmgd; 3565 struct ieee80211_pspoll *pspoll; 3566 struct ieee80211_local *local; 3567 struct sk_buff *skb; 3568 3569 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3570 return NULL; 3571 3572 sdata = vif_to_sdata(vif); 3573 ifmgd = &sdata->u.mgd; 3574 local = sdata->local; 3575 3576 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3577 if (!skb) 3578 return NULL; 3579 3580 skb_reserve(skb, local->hw.extra_tx_headroom); 3581 3582 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3583 memset(pspoll, 0, sizeof(*pspoll)); 3584 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3585 IEEE80211_STYPE_PSPOLL); 3586 pspoll->aid = cpu_to_le16(ifmgd->aid); 3587 3588 /* aid in PS-Poll has its two MSBs each set to 1 */ 3589 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3590 3591 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3592 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3593 3594 return skb; 3595 } 3596 EXPORT_SYMBOL(ieee80211_pspoll_get); 3597 3598 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3599 struct ieee80211_vif *vif) 3600 { 3601 struct ieee80211_hdr_3addr *nullfunc; 3602 struct ieee80211_sub_if_data *sdata; 3603 struct ieee80211_if_managed *ifmgd; 3604 struct ieee80211_local *local; 3605 struct sk_buff *skb; 3606 3607 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3608 return NULL; 3609 3610 sdata = vif_to_sdata(vif); 3611 ifmgd = &sdata->u.mgd; 3612 local = sdata->local; 3613 3614 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3615 if (!skb) 3616 return NULL; 3617 3618 skb_reserve(skb, local->hw.extra_tx_headroom); 3619 3620 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3621 sizeof(*nullfunc)); 3622 memset(nullfunc, 0, sizeof(*nullfunc)); 3623 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3624 IEEE80211_STYPE_NULLFUNC | 3625 IEEE80211_FCTL_TODS); 3626 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3627 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3628 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3629 3630 return skb; 3631 } 3632 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3633 3634 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3635 const u8 *src_addr, 3636 const u8 *ssid, size_t ssid_len, 3637 size_t tailroom) 3638 { 3639 struct ieee80211_local *local = hw_to_local(hw); 3640 struct ieee80211_hdr_3addr *hdr; 3641 struct sk_buff *skb; 3642 size_t ie_ssid_len; 3643 u8 *pos; 3644 3645 ie_ssid_len = 2 + ssid_len; 3646 3647 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3648 ie_ssid_len + tailroom); 3649 if (!skb) 3650 return NULL; 3651 3652 skb_reserve(skb, local->hw.extra_tx_headroom); 3653 3654 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3655 memset(hdr, 0, sizeof(*hdr)); 3656 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3657 IEEE80211_STYPE_PROBE_REQ); 3658 eth_broadcast_addr(hdr->addr1); 3659 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3660 eth_broadcast_addr(hdr->addr3); 3661 3662 pos = skb_put(skb, ie_ssid_len); 3663 *pos++ = WLAN_EID_SSID; 3664 *pos++ = ssid_len; 3665 if (ssid_len) 3666 memcpy(pos, ssid, ssid_len); 3667 pos += ssid_len; 3668 3669 return skb; 3670 } 3671 EXPORT_SYMBOL(ieee80211_probereq_get); 3672 3673 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3674 const void *frame, size_t frame_len, 3675 const struct ieee80211_tx_info *frame_txctl, 3676 struct ieee80211_rts *rts) 3677 { 3678 const struct ieee80211_hdr *hdr = frame; 3679 3680 rts->frame_control = 3681 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3682 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3683 frame_txctl); 3684 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3685 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3686 } 3687 EXPORT_SYMBOL(ieee80211_rts_get); 3688 3689 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3690 const void *frame, size_t frame_len, 3691 const struct ieee80211_tx_info *frame_txctl, 3692 struct ieee80211_cts *cts) 3693 { 3694 const struct ieee80211_hdr *hdr = frame; 3695 3696 cts->frame_control = 3697 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3698 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3699 frame_len, frame_txctl); 3700 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3701 } 3702 EXPORT_SYMBOL(ieee80211_ctstoself_get); 3703 3704 struct sk_buff * 3705 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 3706 struct ieee80211_vif *vif) 3707 { 3708 struct ieee80211_local *local = hw_to_local(hw); 3709 struct sk_buff *skb = NULL; 3710 struct ieee80211_tx_data tx; 3711 struct ieee80211_sub_if_data *sdata; 3712 struct ps_data *ps; 3713 struct ieee80211_tx_info *info; 3714 struct ieee80211_chanctx_conf *chanctx_conf; 3715 3716 sdata = vif_to_sdata(vif); 3717 3718 rcu_read_lock(); 3719 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3720 3721 if (!chanctx_conf) 3722 goto out; 3723 3724 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3725 struct beacon_data *beacon = 3726 rcu_dereference(sdata->u.ap.beacon); 3727 3728 if (!beacon || !beacon->head) 3729 goto out; 3730 3731 ps = &sdata->u.ap.ps; 3732 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3733 ps = &sdata->u.mesh.ps; 3734 } else { 3735 goto out; 3736 } 3737 3738 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 3739 goto out; /* send buffered bc/mc only after DTIM beacon */ 3740 3741 while (1) { 3742 skb = skb_dequeue(&ps->bc_buf); 3743 if (!skb) 3744 goto out; 3745 local->total_ps_buffered--; 3746 3747 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 3748 struct ieee80211_hdr *hdr = 3749 (struct ieee80211_hdr *) skb->data; 3750 /* more buffered multicast/broadcast frames ==> set 3751 * MoreData flag in IEEE 802.11 header to inform PS 3752 * STAs */ 3753 hdr->frame_control |= 3754 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3755 } 3756 3757 if (sdata->vif.type == NL80211_IFTYPE_AP) 3758 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3759 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 3760 break; 3761 dev_kfree_skb_any(skb); 3762 } 3763 3764 info = IEEE80211_SKB_CB(skb); 3765 3766 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3767 info->band = chanctx_conf->def.chan->band; 3768 3769 if (invoke_tx_handlers(&tx)) 3770 skb = NULL; 3771 out: 3772 rcu_read_unlock(); 3773 3774 return skb; 3775 } 3776 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3777 3778 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3779 { 3780 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3781 struct ieee80211_sub_if_data *sdata = sta->sdata; 3782 struct ieee80211_local *local = sdata->local; 3783 int ret; 3784 u32 queues; 3785 3786 lockdep_assert_held(&local->sta_mtx); 3787 3788 /* only some cases are supported right now */ 3789 switch (sdata->vif.type) { 3790 case NL80211_IFTYPE_STATION: 3791 case NL80211_IFTYPE_AP: 3792 case NL80211_IFTYPE_AP_VLAN: 3793 break; 3794 default: 3795 WARN_ON(1); 3796 return -EINVAL; 3797 } 3798 3799 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 3800 return -EINVAL; 3801 3802 if (sta->reserved_tid == tid) { 3803 ret = 0; 3804 goto out; 3805 } 3806 3807 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 3808 sdata_err(sdata, "TID reservation already active\n"); 3809 ret = -EALREADY; 3810 goto out; 3811 } 3812 3813 ieee80211_stop_vif_queues(sdata->local, sdata, 3814 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3815 3816 synchronize_net(); 3817 3818 /* Tear down BA sessions so we stop aggregating on this TID */ 3819 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 3820 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 3821 __ieee80211_stop_tx_ba_session(sta, tid, 3822 AGG_STOP_LOCAL_REQUEST); 3823 } 3824 3825 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 3826 __ieee80211_flush_queues(local, sdata, queues, false); 3827 3828 sta->reserved_tid = tid; 3829 3830 ieee80211_wake_vif_queues(local, sdata, 3831 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3832 3833 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 3834 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 3835 3836 ret = 0; 3837 out: 3838 return ret; 3839 } 3840 EXPORT_SYMBOL(ieee80211_reserve_tid); 3841 3842 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3843 { 3844 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3845 struct ieee80211_sub_if_data *sdata = sta->sdata; 3846 3847 lockdep_assert_held(&sdata->local->sta_mtx); 3848 3849 /* only some cases are supported right now */ 3850 switch (sdata->vif.type) { 3851 case NL80211_IFTYPE_STATION: 3852 case NL80211_IFTYPE_AP: 3853 case NL80211_IFTYPE_AP_VLAN: 3854 break; 3855 default: 3856 WARN_ON(1); 3857 return; 3858 } 3859 3860 if (tid != sta->reserved_tid) { 3861 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 3862 return; 3863 } 3864 3865 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 3866 } 3867 EXPORT_SYMBOL(ieee80211_unreserve_tid); 3868 3869 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3870 struct sk_buff *skb, int tid, 3871 enum ieee80211_band band) 3872 { 3873 int ac = ieee802_1d_to_ac[tid & 7]; 3874 3875 skb_set_mac_header(skb, 0); 3876 skb_set_network_header(skb, 0); 3877 skb_set_transport_header(skb, 0); 3878 3879 skb_set_queue_mapping(skb, ac); 3880 skb->priority = tid; 3881 3882 skb->dev = sdata->dev; 3883 3884 /* 3885 * The other path calling ieee80211_xmit is from the tasklet, 3886 * and while we can handle concurrent transmissions locking 3887 * requirements are that we do not come into tx with bhs on. 3888 */ 3889 local_bh_disable(); 3890 IEEE80211_SKB_CB(skb)->band = band; 3891 ieee80211_xmit(sdata, NULL, skb); 3892 local_bh_enable(); 3893 } 3894