1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "led.h" 32 #include "mesh.h" 33 #include "wep.h" 34 #include "wpa.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 /* misc utils */ 39 40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 41 { 42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 43 44 u64_stats_update_begin(&tstats->syncp); 45 tstats->tx_packets++; 46 tstats->tx_bytes += len; 47 u64_stats_update_end(&tstats->syncp); 48 } 49 50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 51 struct sk_buff *skb, int group_addr, 52 int next_frag_len) 53 { 54 int rate, mrate, erp, dur, i, shift = 0; 55 struct ieee80211_rate *txrate; 56 struct ieee80211_local *local = tx->local; 57 struct ieee80211_supported_band *sband; 58 struct ieee80211_hdr *hdr; 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 60 struct ieee80211_chanctx_conf *chanctx_conf; 61 u32 rate_flags = 0; 62 63 rcu_read_lock(); 64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 65 if (chanctx_conf) { 66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 68 } 69 rcu_read_unlock(); 70 71 /* assume HW handles this */ 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 73 return 0; 74 75 /* uh huh? */ 76 if (WARN_ON_ONCE(tx->rate.idx < 0)) 77 return 0; 78 79 sband = local->hw.wiphy->bands[info->band]; 80 txrate = &sband->bitrates[tx->rate.idx]; 81 82 erp = txrate->flags & IEEE80211_RATE_ERP_G; 83 84 /* 85 * data and mgmt (except PS Poll): 86 * - during CFP: 32768 87 * - during contention period: 88 * if addr1 is group address: 0 89 * if more fragments = 0 and addr1 is individual address: time to 90 * transmit one ACK plus SIFS 91 * if more fragments = 1 and addr1 is individual address: time to 92 * transmit next fragment plus 2 x ACK plus 3 x SIFS 93 * 94 * IEEE 802.11, 9.6: 95 * - control response frame (CTS or ACK) shall be transmitted using the 96 * same rate as the immediately previous frame in the frame exchange 97 * sequence, if this rate belongs to the PHY mandatory rates, or else 98 * at the highest possible rate belonging to the PHY rates in the 99 * BSSBasicRateSet 100 */ 101 hdr = (struct ieee80211_hdr *)skb->data; 102 if (ieee80211_is_ctl(hdr->frame_control)) { 103 /* TODO: These control frames are not currently sent by 104 * mac80211, but should they be implemented, this function 105 * needs to be updated to support duration field calculation. 106 * 107 * RTS: time needed to transmit pending data/mgmt frame plus 108 * one CTS frame plus one ACK frame plus 3 x SIFS 109 * CTS: duration of immediately previous RTS minus time 110 * required to transmit CTS and its SIFS 111 * ACK: 0 if immediately previous directed data/mgmt had 112 * more=0, with more=1 duration in ACK frame is duration 113 * from previous frame minus time needed to transmit ACK 114 * and its SIFS 115 * PS Poll: BIT(15) | BIT(14) | aid 116 */ 117 return 0; 118 } 119 120 /* data/mgmt */ 121 if (0 /* FIX: data/mgmt during CFP */) 122 return cpu_to_le16(32768); 123 124 if (group_addr) /* Group address as the destination - no ACK */ 125 return 0; 126 127 /* Individual destination address: 128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 129 * CTS and ACK frames shall be transmitted using the highest rate in 130 * basic rate set that is less than or equal to the rate of the 131 * immediately previous frame and that is using the same modulation 132 * (CCK or OFDM). If no basic rate set matches with these requirements, 133 * the highest mandatory rate of the PHY that is less than or equal to 134 * the rate of the previous frame is used. 135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 136 */ 137 rate = -1; 138 /* use lowest available if everything fails */ 139 mrate = sband->bitrates[0].bitrate; 140 for (i = 0; i < sband->n_bitrates; i++) { 141 struct ieee80211_rate *r = &sband->bitrates[i]; 142 143 if (r->bitrate > txrate->bitrate) 144 break; 145 146 if ((rate_flags & r->flags) != rate_flags) 147 continue; 148 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 151 152 switch (sband->band) { 153 case IEEE80211_BAND_2GHZ: { 154 u32 flag; 155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 156 flag = IEEE80211_RATE_MANDATORY_G; 157 else 158 flag = IEEE80211_RATE_MANDATORY_B; 159 if (r->flags & flag) 160 mrate = r->bitrate; 161 break; 162 } 163 case IEEE80211_BAND_5GHZ: 164 if (r->flags & IEEE80211_RATE_MANDATORY_A) 165 mrate = r->bitrate; 166 break; 167 case IEEE80211_BAND_60GHZ: 168 /* TODO, for now fall through */ 169 case IEEE80211_NUM_BANDS: 170 WARN_ON(1); 171 break; 172 } 173 } 174 if (rate == -1) { 175 /* No matching basic rate found; use highest suitable mandatory 176 * PHY rate */ 177 rate = DIV_ROUND_UP(mrate, 1 << shift); 178 } 179 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 181 if (ieee80211_is_data_qos(hdr->frame_control) && 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 183 dur = 0; 184 else 185 /* Time needed to transmit ACK 186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 187 * to closest integer */ 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 192 if (next_frag_len) { 193 /* Frame is fragmented: duration increases with time needed to 194 * transmit next fragment plus ACK and 2 x SIFS. */ 195 dur *= 2; /* ACK + SIFS */ 196 /* next fragment */ 197 dur += ieee80211_frame_duration(sband->band, next_frag_len, 198 txrate->bitrate, erp, 199 tx->sdata->vif.bss_conf.use_short_preamble, 200 shift); 201 } 202 203 return cpu_to_le16(dur); 204 } 205 206 /* tx handlers */ 207 static ieee80211_tx_result debug_noinline 208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 209 { 210 struct ieee80211_local *local = tx->local; 211 struct ieee80211_if_managed *ifmgd; 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 ifmgd = &tx->sdata->u.mgd; 241 242 /* 243 * Don't wakeup from power save if u-apsd is enabled, voip ac has 244 * u-apsd enabled and the frame is in voip class. This effectively 245 * means that even if all access categories have u-apsd enabled, in 246 * practise u-apsd is only used with the voip ac. This is a 247 * workaround for the case when received voip class packets do not 248 * have correct qos tag for some reason, due the network or the 249 * peer application. 250 * 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is 252 * changed via debugfs, user needs to reassociate manually to have 253 * everything in sync. 254 */ 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 258 return TX_CONTINUE; 259 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 261 ieee80211_stop_queues_by_reason(&local->hw, 262 IEEE80211_MAX_QUEUE_MAP, 263 IEEE80211_QUEUE_STOP_REASON_PS, 264 false); 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 266 ieee80211_queue_work(&local->hw, 267 &local->dynamic_ps_disable_work); 268 } 269 270 /* Don't restart the timer if we're not disassociated */ 271 if (!ifmgd->associated) 272 return TX_CONTINUE; 273 274 mod_timer(&local->dynamic_ps_timer, jiffies + 275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 276 277 return TX_CONTINUE; 278 } 279 280 static ieee80211_tx_result debug_noinline 281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 282 { 283 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 286 bool assoc = false; 287 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 289 return TX_CONTINUE; 290 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 293 !ieee80211_is_probe_req(hdr->frame_control) && 294 !ieee80211_is_nullfunc(hdr->frame_control)) 295 /* 296 * When software scanning only nullfunc frames (to notify 297 * the sleep state to the AP) and probe requests (for the 298 * active scan) are allowed, all other frames should not be 299 * sent and we should not get here, but if we do 300 * nonetheless, drop them to avoid sending them 301 * off-channel. See the link below and 302 * ieee80211_start_scan() for more. 303 * 304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 305 */ 306 return TX_DROP; 307 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 309 return TX_CONTINUE; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 335 ieee80211_is_data(hdr->frame_control) && 336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 dev_kfree_skb(skb); 372 } 373 total += skb_queue_len(&ps->bc_buf); 374 } 375 376 /* 377 * Drop one frame from each station from the lowest-priority 378 * AC that has frames at all. 379 */ 380 list_for_each_entry_rcu(sta, &local->sta_list, list) { 381 int ac; 382 383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 384 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 385 total += skb_queue_len(&sta->ps_tx_buf[ac]); 386 if (skb) { 387 purged++; 388 ieee80211_free_txskb(&local->hw, skb); 389 break; 390 } 391 } 392 } 393 394 local->total_ps_buffered = total; 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 396 } 397 398 static ieee80211_tx_result 399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 400 { 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 403 struct ps_data *ps; 404 405 /* 406 * broadcast/multicast frame 407 * 408 * If any of the associated/peer stations is in power save mode, 409 * the frame is buffered to be sent after DTIM beacon frame. 410 * This is done either by the hardware or us. 411 */ 412 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 416 if (!tx->sdata->bss) 417 return TX_CONTINUE; 418 419 ps = &tx->sdata->bss->ps; 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 421 ps = &tx->sdata->u.mesh.ps; 422 } else { 423 return TX_CONTINUE; 424 } 425 426 427 /* no buffering for ordered frames */ 428 if (ieee80211_has_order(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_is_probe_req(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 435 info->hw_queue = tx->sdata->vif.cab_queue; 436 437 /* no stations in PS mode */ 438 if (!atomic_read(&ps->num_sta_ps)) 439 return TX_CONTINUE; 440 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 442 443 /* device releases frame after DTIM beacon */ 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 445 return TX_CONTINUE; 446 447 /* buffered in mac80211 */ 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 449 purge_old_ps_buffers(tx->local); 450 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 452 ps_dbg(tx->sdata, 453 "BC TX buffer full - dropping the oldest frame\n"); 454 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 455 } else 456 tx->local->total_ps_buffered++; 457 458 skb_queue_tail(&ps->bc_buf, tx->skb); 459 460 return TX_QUEUED; 461 } 462 463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 464 struct sk_buff *skb) 465 { 466 if (!ieee80211_is_mgmt(fc)) 467 return 0; 468 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 470 return 0; 471 472 if (!ieee80211_is_robust_mgmt_frame(skb)) 473 return 0; 474 475 return 1; 476 } 477 478 static ieee80211_tx_result 479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 480 { 481 struct sta_info *sta = tx->sta; 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 484 struct ieee80211_local *local = tx->local; 485 486 if (unlikely(!sta)) 487 return TX_CONTINUE; 488 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 493 int ac = skb_get_queue_mapping(tx->skb); 494 495 if (ieee80211_is_mgmt(hdr->frame_control) && 496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 498 return TX_CONTINUE; 499 } 500 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 502 sta->sta.addr, sta->sta.aid, ac); 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 504 purge_old_ps_buffers(tx->local); 505 506 /* sync with ieee80211_sta_ps_deliver_wakeup */ 507 spin_lock(&sta->ps_lock); 508 /* 509 * STA woke up the meantime and all the frames on ps_tx_buf have 510 * been queued to pending queue. No reordering can happen, go 511 * ahead and Tx the packet. 512 */ 513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 516 spin_unlock(&sta->ps_lock); 517 return TX_CONTINUE; 518 } 519 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 522 ps_dbg(tx->sdata, 523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 524 sta->sta.addr, ac); 525 ieee80211_free_txskb(&local->hw, old); 526 } else 527 tx->local->total_ps_buffered++; 528 529 info->control.jiffies = jiffies; 530 info->control.vif = &tx->sdata->vif; 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 534 spin_unlock(&sta->ps_lock); 535 536 if (!timer_pending(&local->sta_cleanup)) 537 mod_timer(&local->sta_cleanup, 538 round_jiffies(jiffies + 539 STA_INFO_CLEANUP_INTERVAL)); 540 541 /* 542 * We queued up some frames, so the TIM bit might 543 * need to be set, recalculate it. 544 */ 545 sta_info_recalc_tim(sta); 546 547 return TX_QUEUED; 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 549 ps_dbg(tx->sdata, 550 "STA %pM in PS mode, but polling/in SP -> send frame\n", 551 sta->sta.addr); 552 } 553 554 return TX_CONTINUE; 555 } 556 557 static ieee80211_tx_result debug_noinline 558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 559 { 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 561 return TX_CONTINUE; 562 563 if (tx->flags & IEEE80211_TX_UNICAST) 564 return ieee80211_tx_h_unicast_ps_buf(tx); 565 else 566 return ieee80211_tx_h_multicast_ps_buf(tx); 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 575 if (tx->sdata->control_port_no_encrypt) 576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 579 } 580 581 return TX_CONTINUE; 582 } 583 584 static ieee80211_tx_result debug_noinline 585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 586 { 587 struct ieee80211_key *key; 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 590 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 592 tx->key = NULL; 593 else if (tx->sta && 594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 595 tx->key = key; 596 else if (ieee80211_is_mgmt(hdr->frame_control) && 597 is_multicast_ether_addr(hdr->addr1) && 598 ieee80211_is_robust_mgmt_frame(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 600 tx->key = key; 601 else if (is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (!is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_unicast_key))) 606 tx->key = key; 607 else 608 tx->key = NULL; 609 610 if (tx->key) { 611 bool skip_hw = false; 612 613 tx->key->tx_rx_count++; 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb)) 630 tx->key = NULL; 631 else 632 skip_hw = (tx->key->conf.flags & 633 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 634 ieee80211_is_mgmt(hdr->frame_control); 635 break; 636 case WLAN_CIPHER_SUITE_AES_CMAC: 637 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 638 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 640 if (!ieee80211_is_mgmt(hdr->frame_control)) 641 tx->key = NULL; 642 break; 643 } 644 645 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 646 !ieee80211_is_deauth(hdr->frame_control))) 647 return TX_DROP; 648 649 if (!skip_hw && tx->key && 650 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 651 info->control.hw_key = &tx->key->conf; 652 } 653 654 return TX_CONTINUE; 655 } 656 657 static ieee80211_tx_result debug_noinline 658 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 659 { 660 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 661 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 662 struct ieee80211_supported_band *sband; 663 u32 len; 664 struct ieee80211_tx_rate_control txrc; 665 struct ieee80211_sta_rates *ratetbl = NULL; 666 bool assoc = false; 667 668 memset(&txrc, 0, sizeof(txrc)); 669 670 sband = tx->local->hw.wiphy->bands[info->band]; 671 672 len = min_t(u32, tx->skb->len + FCS_LEN, 673 tx->local->hw.wiphy->frag_threshold); 674 675 /* set up the tx rate control struct we give the RC algo */ 676 txrc.hw = &tx->local->hw; 677 txrc.sband = sband; 678 txrc.bss_conf = &tx->sdata->vif.bss_conf; 679 txrc.skb = tx->skb; 680 txrc.reported_rate.idx = -1; 681 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 682 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 683 txrc.max_rate_idx = -1; 684 else 685 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 686 687 if (tx->sdata->rc_has_mcs_mask[info->band]) 688 txrc.rate_idx_mcs_mask = 689 tx->sdata->rc_rateidx_mcs_mask[info->band]; 690 691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 if (tx->sta) 717 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 718 719 /* 720 * Lets not bother rate control if we're associated and cannot 721 * talk to the sta. This should not happen. 722 */ 723 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 724 !rate_usable_index_exists(sband, &tx->sta->sta), 725 "%s: Dropped data frame as no usable bitrate found while " 726 "scanning and associated. Target station: " 727 "%pM on %d GHz band\n", 728 tx->sdata->name, hdr->addr1, 729 info->band ? 5 : 2)) 730 return TX_DROP; 731 732 /* 733 * If we're associated with the sta at this point we know we can at 734 * least send the frame at the lowest bit rate. 735 */ 736 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 737 738 if (tx->sta && !info->control.skip_table) 739 ratetbl = rcu_dereference(tx->sta->sta.rates); 740 741 if (unlikely(info->control.rates[0].idx < 0)) { 742 if (ratetbl) { 743 struct ieee80211_tx_rate rate = { 744 .idx = ratetbl->rate[0].idx, 745 .flags = ratetbl->rate[0].flags, 746 .count = ratetbl->rate[0].count 747 }; 748 749 if (ratetbl->rate[0].idx < 0) 750 return TX_DROP; 751 752 tx->rate = rate; 753 } else { 754 return TX_DROP; 755 } 756 } else { 757 tx->rate = info->control.rates[0]; 758 } 759 760 if (txrc.reported_rate.idx < 0) { 761 txrc.reported_rate = tx->rate; 762 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 763 tx->sta->last_tx_rate = txrc.reported_rate; 764 } else if (tx->sta) 765 tx->sta->last_tx_rate = txrc.reported_rate; 766 767 if (ratetbl) 768 return TX_CONTINUE; 769 770 if (unlikely(!info->control.rates[0].count)) 771 info->control.rates[0].count = 1; 772 773 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 774 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 775 info->control.rates[0].count = 1; 776 777 return TX_CONTINUE; 778 } 779 780 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 781 { 782 u16 *seq = &sta->tid_seq[tid]; 783 __le16 ret = cpu_to_le16(*seq); 784 785 /* Increase the sequence number. */ 786 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 787 788 return ret; 789 } 790 791 static ieee80211_tx_result debug_noinline 792 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 793 { 794 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 795 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 796 u8 *qc; 797 int tid; 798 799 /* 800 * Packet injection may want to control the sequence 801 * number, if we have no matching interface then we 802 * neither assign one ourselves nor ask the driver to. 803 */ 804 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 805 return TX_CONTINUE; 806 807 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 808 return TX_CONTINUE; 809 810 if (ieee80211_hdrlen(hdr->frame_control) < 24) 811 return TX_CONTINUE; 812 813 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 814 return TX_CONTINUE; 815 816 /* 817 * Anything but QoS data that has a sequence number field 818 * (is long enough) gets a sequence number from the global 819 * counter. QoS data frames with a multicast destination 820 * also use the global counter (802.11-2012 9.3.2.10). 821 */ 822 if (!ieee80211_is_data_qos(hdr->frame_control) || 823 is_multicast_ether_addr(hdr->addr1)) { 824 /* driver should assign sequence number */ 825 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 826 /* for pure STA mode without beacons, we can do it */ 827 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 828 tx->sdata->sequence_number += 0x10; 829 if (tx->sta) 830 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++; 831 return TX_CONTINUE; 832 } 833 834 /* 835 * This should be true for injected/management frames only, for 836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 837 * above since they are not QoS-data frames. 838 */ 839 if (!tx->sta) 840 return TX_CONTINUE; 841 842 /* include per-STA, per-TID sequence counter */ 843 844 qc = ieee80211_get_qos_ctl(hdr); 845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 846 tx->sta->tx_msdu[tid]++; 847 848 if (!tx->sta->sta.txq[0]) 849 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 850 851 return TX_CONTINUE; 852 } 853 854 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 855 struct sk_buff *skb, int hdrlen, 856 int frag_threshold) 857 { 858 struct ieee80211_local *local = tx->local; 859 struct ieee80211_tx_info *info; 860 struct sk_buff *tmp; 861 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 862 int pos = hdrlen + per_fragm; 863 int rem = skb->len - hdrlen - per_fragm; 864 865 if (WARN_ON(rem < 0)) 866 return -EINVAL; 867 868 /* first fragment was already added to queue by caller */ 869 870 while (rem) { 871 int fraglen = per_fragm; 872 873 if (fraglen > rem) 874 fraglen = rem; 875 rem -= fraglen; 876 tmp = dev_alloc_skb(local->tx_headroom + 877 frag_threshold + 878 tx->sdata->encrypt_headroom + 879 IEEE80211_ENCRYPT_TAILROOM); 880 if (!tmp) 881 return -ENOMEM; 882 883 __skb_queue_tail(&tx->skbs, tmp); 884 885 skb_reserve(tmp, 886 local->tx_headroom + tx->sdata->encrypt_headroom); 887 888 /* copy control information */ 889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 890 891 info = IEEE80211_SKB_CB(tmp); 892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 893 IEEE80211_TX_CTL_FIRST_FRAGMENT); 894 895 if (rem) 896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 897 898 skb_copy_queue_mapping(tmp, skb); 899 tmp->priority = skb->priority; 900 tmp->dev = skb->dev; 901 902 /* copy header and data */ 903 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 904 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 905 906 pos += fraglen; 907 } 908 909 /* adjust first fragment's length */ 910 skb_trim(skb, hdrlen + per_fragm); 911 return 0; 912 } 913 914 static ieee80211_tx_result debug_noinline 915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 916 { 917 struct sk_buff *skb = tx->skb; 918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 919 struct ieee80211_hdr *hdr = (void *)skb->data; 920 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 921 int hdrlen; 922 int fragnum; 923 924 /* no matter what happens, tx->skb moves to tx->skbs */ 925 __skb_queue_tail(&tx->skbs, skb); 926 tx->skb = NULL; 927 928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 929 return TX_CONTINUE; 930 931 if (tx->local->ops->set_frag_threshold) 932 return TX_CONTINUE; 933 934 /* 935 * Warn when submitting a fragmented A-MPDU frame and drop it. 936 * This scenario is handled in ieee80211_tx_prepare but extra 937 * caution taken here as fragmented ampdu may cause Tx stop. 938 */ 939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 940 return TX_DROP; 941 942 hdrlen = ieee80211_hdrlen(hdr->frame_control); 943 944 /* internal error, why isn't DONTFRAG set? */ 945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 946 return TX_DROP; 947 948 /* 949 * Now fragment the frame. This will allocate all the fragments and 950 * chain them (using skb as the first fragment) to skb->next. 951 * During transmission, we will remove the successfully transmitted 952 * fragments from this list. When the low-level driver rejects one 953 * of the fragments then we will simply pretend to accept the skb 954 * but store it away as pending. 955 */ 956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 957 return TX_DROP; 958 959 /* update duration/seq/flags of fragments */ 960 fragnum = 0; 961 962 skb_queue_walk(&tx->skbs, skb) { 963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 964 965 hdr = (void *)skb->data; 966 info = IEEE80211_SKB_CB(skb); 967 968 if (!skb_queue_is_last(&tx->skbs, skb)) { 969 hdr->frame_control |= morefrags; 970 /* 971 * No multi-rate retries for fragmented frames, that 972 * would completely throw off the NAV at other STAs. 973 */ 974 info->control.rates[1].idx = -1; 975 info->control.rates[2].idx = -1; 976 info->control.rates[3].idx = -1; 977 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 978 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 979 } else { 980 hdr->frame_control &= ~morefrags; 981 } 982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 983 fragnum++; 984 } 985 986 return TX_CONTINUE; 987 } 988 989 static ieee80211_tx_result debug_noinline 990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 991 { 992 struct sk_buff *skb; 993 int ac = -1; 994 995 if (!tx->sta) 996 return TX_CONTINUE; 997 998 skb_queue_walk(&tx->skbs, skb) { 999 ac = skb_get_queue_mapping(skb); 1000 tx->sta->tx_bytes[ac] += skb->len; 1001 } 1002 if (ac >= 0) 1003 tx->sta->tx_packets[ac]++; 1004 1005 return TX_CONTINUE; 1006 } 1007 1008 static ieee80211_tx_result debug_noinline 1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1010 { 1011 if (!tx->key) 1012 return TX_CONTINUE; 1013 1014 switch (tx->key->conf.cipher) { 1015 case WLAN_CIPHER_SUITE_WEP40: 1016 case WLAN_CIPHER_SUITE_WEP104: 1017 return ieee80211_crypto_wep_encrypt(tx); 1018 case WLAN_CIPHER_SUITE_TKIP: 1019 return ieee80211_crypto_tkip_encrypt(tx); 1020 case WLAN_CIPHER_SUITE_CCMP: 1021 return ieee80211_crypto_ccmp_encrypt( 1022 tx, IEEE80211_CCMP_MIC_LEN); 1023 case WLAN_CIPHER_SUITE_CCMP_256: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_256_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_AES_CMAC: 1027 return ieee80211_crypto_aes_cmac_encrypt(tx); 1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1032 return ieee80211_crypto_aes_gmac_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_GCMP: 1034 case WLAN_CIPHER_SUITE_GCMP_256: 1035 return ieee80211_crypto_gcmp_encrypt(tx); 1036 default: 1037 return ieee80211_crypto_hw_encrypt(tx); 1038 } 1039 1040 return TX_DROP; 1041 } 1042 1043 static ieee80211_tx_result debug_noinline 1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1045 { 1046 struct sk_buff *skb; 1047 struct ieee80211_hdr *hdr; 1048 int next_len; 1049 bool group_addr; 1050 1051 skb_queue_walk(&tx->skbs, skb) { 1052 hdr = (void *) skb->data; 1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1054 break; /* must not overwrite AID */ 1055 if (!skb_queue_is_last(&tx->skbs, skb)) { 1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1057 next_len = next->len; 1058 } else 1059 next_len = 0; 1060 group_addr = is_multicast_ether_addr(hdr->addr1); 1061 1062 hdr->duration_id = 1063 ieee80211_duration(tx, skb, group_addr, next_len); 1064 } 1065 1066 return TX_CONTINUE; 1067 } 1068 1069 /* actual transmit path */ 1070 1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1072 struct sk_buff *skb, 1073 struct ieee80211_tx_info *info, 1074 struct tid_ampdu_tx *tid_tx, 1075 int tid) 1076 { 1077 bool queued = false; 1078 bool reset_agg_timer = false; 1079 struct sk_buff *purge_skb = NULL; 1080 1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1082 info->flags |= IEEE80211_TX_CTL_AMPDU; 1083 reset_agg_timer = true; 1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1085 /* 1086 * nothing -- this aggregation session is being started 1087 * but that might still fail with the driver 1088 */ 1089 } else if (!tx->sta->sta.txq[tid]) { 1090 spin_lock(&tx->sta->lock); 1091 /* 1092 * Need to re-check now, because we may get here 1093 * 1094 * 1) in the window during which the setup is actually 1095 * already done, but not marked yet because not all 1096 * packets are spliced over to the driver pending 1097 * queue yet -- if this happened we acquire the lock 1098 * either before or after the splice happens, but 1099 * need to recheck which of these cases happened. 1100 * 1101 * 2) during session teardown, if the OPERATIONAL bit 1102 * was cleared due to the teardown but the pointer 1103 * hasn't been assigned NULL yet (or we loaded it 1104 * before it was assigned) -- in this case it may 1105 * now be NULL which means we should just let the 1106 * packet pass through because splicing the frames 1107 * back is already done. 1108 */ 1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1110 1111 if (!tid_tx) { 1112 /* do nothing, let packet pass through */ 1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1114 info->flags |= IEEE80211_TX_CTL_AMPDU; 1115 reset_agg_timer = true; 1116 } else { 1117 queued = true; 1118 info->control.vif = &tx->sdata->vif; 1119 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1120 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS | 1121 IEEE80211_TX_CTL_NO_PS_BUFFER | 1122 IEEE80211_TX_STATUS_EOSP; 1123 __skb_queue_tail(&tid_tx->pending, skb); 1124 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1125 purge_skb = __skb_dequeue(&tid_tx->pending); 1126 } 1127 spin_unlock(&tx->sta->lock); 1128 1129 if (purge_skb) 1130 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1131 } 1132 1133 /* reset session timer */ 1134 if (reset_agg_timer && tid_tx->timeout) 1135 tid_tx->last_tx = jiffies; 1136 1137 return queued; 1138 } 1139 1140 /* 1141 * initialises @tx 1142 * pass %NULL for the station if unknown, a valid pointer if known 1143 * or an ERR_PTR() if the station is known not to exist 1144 */ 1145 static ieee80211_tx_result 1146 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1147 struct ieee80211_tx_data *tx, 1148 struct sta_info *sta, struct sk_buff *skb) 1149 { 1150 struct ieee80211_local *local = sdata->local; 1151 struct ieee80211_hdr *hdr; 1152 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1153 int tid; 1154 u8 *qc; 1155 1156 memset(tx, 0, sizeof(*tx)); 1157 tx->skb = skb; 1158 tx->local = local; 1159 tx->sdata = sdata; 1160 __skb_queue_head_init(&tx->skbs); 1161 1162 /* 1163 * If this flag is set to true anywhere, and we get here, 1164 * we are doing the needed processing, so remove the flag 1165 * now. 1166 */ 1167 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1168 1169 hdr = (struct ieee80211_hdr *) skb->data; 1170 1171 if (likely(sta)) { 1172 if (!IS_ERR(sta)) 1173 tx->sta = sta; 1174 } else { 1175 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1176 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1177 if (!tx->sta && sdata->wdev.use_4addr) 1178 return TX_DROP; 1179 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1180 IEEE80211_TX_CTL_INJECTED) || 1181 tx->sdata->control_port_protocol == tx->skb->protocol) { 1182 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1183 } 1184 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1185 tx->sta = sta_info_get(sdata, hdr->addr1); 1186 } 1187 1188 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1189 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1190 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1191 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1192 struct tid_ampdu_tx *tid_tx; 1193 1194 qc = ieee80211_get_qos_ctl(hdr); 1195 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1196 1197 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1198 if (tid_tx) { 1199 bool queued; 1200 1201 queued = ieee80211_tx_prep_agg(tx, skb, info, 1202 tid_tx, tid); 1203 1204 if (unlikely(queued)) 1205 return TX_QUEUED; 1206 } 1207 } 1208 1209 if (is_multicast_ether_addr(hdr->addr1)) { 1210 tx->flags &= ~IEEE80211_TX_UNICAST; 1211 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1212 } else 1213 tx->flags |= IEEE80211_TX_UNICAST; 1214 1215 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1216 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1217 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1218 info->flags & IEEE80211_TX_CTL_AMPDU) 1219 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1220 } 1221 1222 if (!tx->sta) 1223 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1224 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1225 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1226 1227 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1228 1229 return TX_CONTINUE; 1230 } 1231 1232 static void ieee80211_drv_tx(struct ieee80211_local *local, 1233 struct ieee80211_vif *vif, 1234 struct ieee80211_sta *pubsta, 1235 struct sk_buff *skb) 1236 { 1237 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1238 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1239 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1240 struct ieee80211_tx_control control = { 1241 .sta = pubsta, 1242 }; 1243 struct ieee80211_txq *txq = NULL; 1244 struct txq_info *txqi; 1245 u8 ac; 1246 1247 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE) 1248 goto tx_normal; 1249 1250 if (!ieee80211_is_data(hdr->frame_control)) 1251 goto tx_normal; 1252 1253 if (pubsta) { 1254 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1255 1256 txq = pubsta->txq[tid]; 1257 } else if (vif) { 1258 txq = vif->txq; 1259 } 1260 1261 if (!txq) 1262 goto tx_normal; 1263 1264 ac = txq->ac; 1265 txqi = to_txq_info(txq); 1266 atomic_inc(&sdata->txqs_len[ac]); 1267 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending) 1268 netif_stop_subqueue(sdata->dev, ac); 1269 1270 skb_queue_tail(&txqi->queue, skb); 1271 drv_wake_tx_queue(local, txqi); 1272 1273 return; 1274 1275 tx_normal: 1276 drv_tx(local, &control, skb); 1277 } 1278 1279 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1280 struct ieee80211_txq *txq) 1281 { 1282 struct ieee80211_local *local = hw_to_local(hw); 1283 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif); 1284 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1285 struct ieee80211_hdr *hdr; 1286 struct sk_buff *skb = NULL; 1287 u8 ac = txq->ac; 1288 1289 spin_lock_bh(&txqi->queue.lock); 1290 1291 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1292 goto out; 1293 1294 skb = __skb_dequeue(&txqi->queue); 1295 if (!skb) 1296 goto out; 1297 1298 atomic_dec(&sdata->txqs_len[ac]); 1299 if (__netif_subqueue_stopped(sdata->dev, ac)) 1300 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]); 1301 1302 hdr = (struct ieee80211_hdr *)skb->data; 1303 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1304 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1305 sta); 1306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1307 1308 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1309 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1310 info->flags |= IEEE80211_TX_CTL_AMPDU; 1311 else 1312 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1313 } 1314 1315 out: 1316 spin_unlock_bh(&txqi->queue.lock); 1317 1318 return skb; 1319 } 1320 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1321 1322 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1323 struct ieee80211_vif *vif, 1324 struct ieee80211_sta *sta, 1325 struct sk_buff_head *skbs, 1326 bool txpending) 1327 { 1328 struct sk_buff *skb, *tmp; 1329 unsigned long flags; 1330 1331 skb_queue_walk_safe(skbs, skb, tmp) { 1332 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1333 int q = info->hw_queue; 1334 1335 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1336 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1337 __skb_unlink(skb, skbs); 1338 ieee80211_free_txskb(&local->hw, skb); 1339 continue; 1340 } 1341 #endif 1342 1343 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1344 if (local->queue_stop_reasons[q] || 1345 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1346 if (unlikely(info->flags & 1347 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1348 if (local->queue_stop_reasons[q] & 1349 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1350 /* 1351 * Drop off-channel frames if queues 1352 * are stopped for any reason other 1353 * than off-channel operation. Never 1354 * queue them. 1355 */ 1356 spin_unlock_irqrestore( 1357 &local->queue_stop_reason_lock, 1358 flags); 1359 ieee80211_purge_tx_queue(&local->hw, 1360 skbs); 1361 return true; 1362 } 1363 } else { 1364 1365 /* 1366 * Since queue is stopped, queue up frames for 1367 * later transmission from the tx-pending 1368 * tasklet when the queue is woken again. 1369 */ 1370 if (txpending) 1371 skb_queue_splice_init(skbs, 1372 &local->pending[q]); 1373 else 1374 skb_queue_splice_tail_init(skbs, 1375 &local->pending[q]); 1376 1377 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1378 flags); 1379 return false; 1380 } 1381 } 1382 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1383 1384 info->control.vif = vif; 1385 1386 __skb_unlink(skb, skbs); 1387 ieee80211_drv_tx(local, vif, sta, skb); 1388 } 1389 1390 return true; 1391 } 1392 1393 /* 1394 * Returns false if the frame couldn't be transmitted but was queued instead. 1395 */ 1396 static bool __ieee80211_tx(struct ieee80211_local *local, 1397 struct sk_buff_head *skbs, int led_len, 1398 struct sta_info *sta, bool txpending) 1399 { 1400 struct ieee80211_tx_info *info; 1401 struct ieee80211_sub_if_data *sdata; 1402 struct ieee80211_vif *vif; 1403 struct ieee80211_sta *pubsta; 1404 struct sk_buff *skb; 1405 bool result = true; 1406 __le16 fc; 1407 1408 if (WARN_ON(skb_queue_empty(skbs))) 1409 return true; 1410 1411 skb = skb_peek(skbs); 1412 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1413 info = IEEE80211_SKB_CB(skb); 1414 sdata = vif_to_sdata(info->control.vif); 1415 if (sta && !sta->uploaded) 1416 sta = NULL; 1417 1418 if (sta) 1419 pubsta = &sta->sta; 1420 else 1421 pubsta = NULL; 1422 1423 switch (sdata->vif.type) { 1424 case NL80211_IFTYPE_MONITOR: 1425 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1426 vif = &sdata->vif; 1427 break; 1428 } 1429 sdata = rcu_dereference(local->monitor_sdata); 1430 if (sdata) { 1431 vif = &sdata->vif; 1432 info->hw_queue = 1433 vif->hw_queue[skb_get_queue_mapping(skb)]; 1434 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1435 dev_kfree_skb(skb); 1436 return true; 1437 } else 1438 vif = NULL; 1439 break; 1440 case NL80211_IFTYPE_AP_VLAN: 1441 sdata = container_of(sdata->bss, 1442 struct ieee80211_sub_if_data, u.ap); 1443 /* fall through */ 1444 default: 1445 vif = &sdata->vif; 1446 break; 1447 } 1448 1449 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1450 txpending); 1451 1452 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1453 1454 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1455 1456 return result; 1457 } 1458 1459 /* 1460 * Invoke TX handlers, return 0 on success and non-zero if the 1461 * frame was dropped or queued. 1462 */ 1463 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1464 { 1465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1466 ieee80211_tx_result res = TX_DROP; 1467 1468 #define CALL_TXH(txh) \ 1469 do { \ 1470 res = txh(tx); \ 1471 if (res != TX_CONTINUE) \ 1472 goto txh_done; \ 1473 } while (0) 1474 1475 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1476 CALL_TXH(ieee80211_tx_h_check_assoc); 1477 CALL_TXH(ieee80211_tx_h_ps_buf); 1478 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1479 CALL_TXH(ieee80211_tx_h_select_key); 1480 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1481 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1482 1483 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1484 __skb_queue_tail(&tx->skbs, tx->skb); 1485 tx->skb = NULL; 1486 goto txh_done; 1487 } 1488 1489 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1490 CALL_TXH(ieee80211_tx_h_sequence); 1491 CALL_TXH(ieee80211_tx_h_fragment); 1492 /* handlers after fragment must be aware of tx info fragmentation! */ 1493 CALL_TXH(ieee80211_tx_h_stats); 1494 CALL_TXH(ieee80211_tx_h_encrypt); 1495 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1496 CALL_TXH(ieee80211_tx_h_calculate_duration); 1497 #undef CALL_TXH 1498 1499 txh_done: 1500 if (unlikely(res == TX_DROP)) { 1501 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1502 if (tx->skb) 1503 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1504 else 1505 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1506 return -1; 1507 } else if (unlikely(res == TX_QUEUED)) { 1508 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1509 return -1; 1510 } 1511 1512 return 0; 1513 } 1514 1515 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1516 struct ieee80211_vif *vif, struct sk_buff *skb, 1517 int band, struct ieee80211_sta **sta) 1518 { 1519 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1521 struct ieee80211_tx_data tx; 1522 struct sk_buff *skb2; 1523 1524 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1525 return false; 1526 1527 info->band = band; 1528 info->control.vif = vif; 1529 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1530 1531 if (invoke_tx_handlers(&tx)) 1532 return false; 1533 1534 if (sta) { 1535 if (tx.sta) 1536 *sta = &tx.sta->sta; 1537 else 1538 *sta = NULL; 1539 } 1540 1541 /* this function isn't suitable for fragmented data frames */ 1542 skb2 = __skb_dequeue(&tx.skbs); 1543 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1544 ieee80211_free_txskb(hw, skb2); 1545 ieee80211_purge_tx_queue(hw, &tx.skbs); 1546 return false; 1547 } 1548 1549 return true; 1550 } 1551 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1552 1553 /* 1554 * Returns false if the frame couldn't be transmitted but was queued instead. 1555 */ 1556 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1557 struct sta_info *sta, struct sk_buff *skb, 1558 bool txpending) 1559 { 1560 struct ieee80211_local *local = sdata->local; 1561 struct ieee80211_tx_data tx; 1562 ieee80211_tx_result res_prepare; 1563 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1564 bool result = true; 1565 int led_len; 1566 1567 if (unlikely(skb->len < 10)) { 1568 dev_kfree_skb(skb); 1569 return true; 1570 } 1571 1572 /* initialises tx */ 1573 led_len = skb->len; 1574 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1575 1576 if (unlikely(res_prepare == TX_DROP)) { 1577 ieee80211_free_txskb(&local->hw, skb); 1578 return true; 1579 } else if (unlikely(res_prepare == TX_QUEUED)) { 1580 return true; 1581 } 1582 1583 /* set up hw_queue value early */ 1584 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1585 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1586 info->hw_queue = 1587 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1588 1589 if (!invoke_tx_handlers(&tx)) 1590 result = __ieee80211_tx(local, &tx.skbs, led_len, 1591 tx.sta, txpending); 1592 1593 return result; 1594 } 1595 1596 /* device xmit handlers */ 1597 1598 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1599 struct sk_buff *skb, 1600 int head_need, bool may_encrypt) 1601 { 1602 struct ieee80211_local *local = sdata->local; 1603 int tail_need = 0; 1604 1605 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1606 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1607 tail_need -= skb_tailroom(skb); 1608 tail_need = max_t(int, tail_need, 0); 1609 } 1610 1611 if (skb_cloned(skb) && 1612 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1613 !skb_clone_writable(skb, ETH_HLEN) || 1614 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1615 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1616 else if (head_need || tail_need) 1617 I802_DEBUG_INC(local->tx_expand_skb_head); 1618 else 1619 return 0; 1620 1621 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1622 wiphy_debug(local->hw.wiphy, 1623 "failed to reallocate TX buffer\n"); 1624 return -ENOMEM; 1625 } 1626 1627 return 0; 1628 } 1629 1630 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1631 struct sta_info *sta, struct sk_buff *skb) 1632 { 1633 struct ieee80211_local *local = sdata->local; 1634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1635 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1636 int headroom; 1637 bool may_encrypt; 1638 1639 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1640 1641 headroom = local->tx_headroom; 1642 if (may_encrypt) 1643 headroom += sdata->encrypt_headroom; 1644 headroom -= skb_headroom(skb); 1645 headroom = max_t(int, 0, headroom); 1646 1647 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1648 ieee80211_free_txskb(&local->hw, skb); 1649 return; 1650 } 1651 1652 hdr = (struct ieee80211_hdr *) skb->data; 1653 info->control.vif = &sdata->vif; 1654 1655 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1656 if (ieee80211_is_data(hdr->frame_control) && 1657 is_unicast_ether_addr(hdr->addr1)) { 1658 if (mesh_nexthop_resolve(sdata, skb)) 1659 return; /* skb queued: don't free */ 1660 } else { 1661 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1662 } 1663 } 1664 1665 ieee80211_set_qos_hdr(sdata, skb); 1666 ieee80211_tx(sdata, sta, skb, false); 1667 } 1668 1669 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1670 { 1671 struct ieee80211_radiotap_iterator iterator; 1672 struct ieee80211_radiotap_header *rthdr = 1673 (struct ieee80211_radiotap_header *) skb->data; 1674 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1675 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1676 NULL); 1677 u16 txflags; 1678 1679 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1680 IEEE80211_TX_CTL_DONTFRAG; 1681 1682 /* 1683 * for every radiotap entry that is present 1684 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1685 * entries present, or -EINVAL on error) 1686 */ 1687 1688 while (!ret) { 1689 ret = ieee80211_radiotap_iterator_next(&iterator); 1690 1691 if (ret) 1692 continue; 1693 1694 /* see if this argument is something we can use */ 1695 switch (iterator.this_arg_index) { 1696 /* 1697 * You must take care when dereferencing iterator.this_arg 1698 * for multibyte types... the pointer is not aligned. Use 1699 * get_unaligned((type *)iterator.this_arg) to dereference 1700 * iterator.this_arg for type "type" safely on all arches. 1701 */ 1702 case IEEE80211_RADIOTAP_FLAGS: 1703 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1704 /* 1705 * this indicates that the skb we have been 1706 * handed has the 32-bit FCS CRC at the end... 1707 * we should react to that by snipping it off 1708 * because it will be recomputed and added 1709 * on transmission 1710 */ 1711 if (skb->len < (iterator._max_length + FCS_LEN)) 1712 return false; 1713 1714 skb_trim(skb, skb->len - FCS_LEN); 1715 } 1716 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1717 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1718 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1719 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1720 break; 1721 1722 case IEEE80211_RADIOTAP_TX_FLAGS: 1723 txflags = get_unaligned_le16(iterator.this_arg); 1724 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1725 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1726 break; 1727 1728 /* 1729 * Please update the file 1730 * Documentation/networking/mac80211-injection.txt 1731 * when parsing new fields here. 1732 */ 1733 1734 default: 1735 break; 1736 } 1737 } 1738 1739 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1740 return false; 1741 1742 /* 1743 * remove the radiotap header 1744 * iterator->_max_length was sanity-checked against 1745 * skb->len by iterator init 1746 */ 1747 skb_pull(skb, iterator._max_length); 1748 1749 return true; 1750 } 1751 1752 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1753 struct net_device *dev) 1754 { 1755 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1756 struct ieee80211_chanctx_conf *chanctx_conf; 1757 struct ieee80211_radiotap_header *prthdr = 1758 (struct ieee80211_radiotap_header *)skb->data; 1759 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1760 struct ieee80211_hdr *hdr; 1761 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1762 struct cfg80211_chan_def *chandef; 1763 u16 len_rthdr; 1764 int hdrlen; 1765 1766 /* check for not even having the fixed radiotap header part */ 1767 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1768 goto fail; /* too short to be possibly valid */ 1769 1770 /* is it a header version we can trust to find length from? */ 1771 if (unlikely(prthdr->it_version)) 1772 goto fail; /* only version 0 is supported */ 1773 1774 /* then there must be a radiotap header with a length we can use */ 1775 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1776 1777 /* does the skb contain enough to deliver on the alleged length? */ 1778 if (unlikely(skb->len < len_rthdr)) 1779 goto fail; /* skb too short for claimed rt header extent */ 1780 1781 /* 1782 * fix up the pointers accounting for the radiotap 1783 * header still being in there. We are being given 1784 * a precooked IEEE80211 header so no need for 1785 * normal processing 1786 */ 1787 skb_set_mac_header(skb, len_rthdr); 1788 /* 1789 * these are just fixed to the end of the rt area since we 1790 * don't have any better information and at this point, nobody cares 1791 */ 1792 skb_set_network_header(skb, len_rthdr); 1793 skb_set_transport_header(skb, len_rthdr); 1794 1795 if (skb->len < len_rthdr + 2) 1796 goto fail; 1797 1798 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1799 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1800 1801 if (skb->len < len_rthdr + hdrlen) 1802 goto fail; 1803 1804 /* 1805 * Initialize skb->protocol if the injected frame is a data frame 1806 * carrying a rfc1042 header 1807 */ 1808 if (ieee80211_is_data(hdr->frame_control) && 1809 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1810 u8 *payload = (u8 *)hdr + hdrlen; 1811 1812 if (ether_addr_equal(payload, rfc1042_header)) 1813 skb->protocol = cpu_to_be16((payload[6] << 8) | 1814 payload[7]); 1815 } 1816 1817 memset(info, 0, sizeof(*info)); 1818 1819 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1820 IEEE80211_TX_CTL_INJECTED; 1821 1822 /* process and remove the injection radiotap header */ 1823 if (!ieee80211_parse_tx_radiotap(skb)) 1824 goto fail; 1825 1826 rcu_read_lock(); 1827 1828 /* 1829 * We process outgoing injected frames that have a local address 1830 * we handle as though they are non-injected frames. 1831 * This code here isn't entirely correct, the local MAC address 1832 * isn't always enough to find the interface to use; for proper 1833 * VLAN/WDS support we will need a different mechanism (which 1834 * likely isn't going to be monitor interfaces). 1835 */ 1836 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1837 1838 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1839 if (!ieee80211_sdata_running(tmp_sdata)) 1840 continue; 1841 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1842 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1843 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1844 continue; 1845 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1846 sdata = tmp_sdata; 1847 break; 1848 } 1849 } 1850 1851 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1852 if (!chanctx_conf) { 1853 tmp_sdata = rcu_dereference(local->monitor_sdata); 1854 if (tmp_sdata) 1855 chanctx_conf = 1856 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1857 } 1858 1859 if (chanctx_conf) 1860 chandef = &chanctx_conf->def; 1861 else if (!local->use_chanctx) 1862 chandef = &local->_oper_chandef; 1863 else 1864 goto fail_rcu; 1865 1866 /* 1867 * Frame injection is not allowed if beaconing is not allowed 1868 * or if we need radar detection. Beaconing is usually not allowed when 1869 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1870 * Passive scan is also used in world regulatory domains where 1871 * your country is not known and as such it should be treated as 1872 * NO TX unless the channel is explicitly allowed in which case 1873 * your current regulatory domain would not have the passive scan 1874 * flag. 1875 * 1876 * Since AP mode uses monitor interfaces to inject/TX management 1877 * frames we can make AP mode the exception to this rule once it 1878 * supports radar detection as its implementation can deal with 1879 * radar detection by itself. We can do that later by adding a 1880 * monitor flag interfaces used for AP support. 1881 */ 1882 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1883 sdata->vif.type)) 1884 goto fail_rcu; 1885 1886 info->band = chandef->chan->band; 1887 ieee80211_xmit(sdata, NULL, skb); 1888 rcu_read_unlock(); 1889 1890 return NETDEV_TX_OK; 1891 1892 fail_rcu: 1893 rcu_read_unlock(); 1894 fail: 1895 dev_kfree_skb(skb); 1896 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1897 } 1898 1899 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 1900 { 1901 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 1902 1903 return ethertype == ETH_P_TDLS && 1904 skb->len > 14 && 1905 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1906 } 1907 1908 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 1909 struct sk_buff *skb, 1910 struct sta_info **sta_out) 1911 { 1912 struct sta_info *sta; 1913 1914 switch (sdata->vif.type) { 1915 case NL80211_IFTYPE_AP_VLAN: 1916 sta = rcu_dereference(sdata->u.vlan.sta); 1917 if (sta) { 1918 *sta_out = sta; 1919 return 0; 1920 } else if (sdata->wdev.use_4addr) { 1921 return -ENOLINK; 1922 } 1923 /* fall through */ 1924 case NL80211_IFTYPE_AP: 1925 case NL80211_IFTYPE_OCB: 1926 case NL80211_IFTYPE_ADHOC: 1927 if (is_multicast_ether_addr(skb->data)) { 1928 *sta_out = ERR_PTR(-ENOENT); 1929 return 0; 1930 } 1931 sta = sta_info_get_bss(sdata, skb->data); 1932 break; 1933 case NL80211_IFTYPE_WDS: 1934 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 1935 break; 1936 #ifdef CONFIG_MAC80211_MESH 1937 case NL80211_IFTYPE_MESH_POINT: 1938 /* determined much later */ 1939 *sta_out = NULL; 1940 return 0; 1941 #endif 1942 case NL80211_IFTYPE_STATION: 1943 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1944 sta = sta_info_get(sdata, skb->data); 1945 if (sta) { 1946 bool tdls_peer, tdls_auth; 1947 1948 tdls_peer = test_sta_flag(sta, 1949 WLAN_STA_TDLS_PEER); 1950 tdls_auth = test_sta_flag(sta, 1951 WLAN_STA_TDLS_PEER_AUTH); 1952 1953 if (tdls_peer && tdls_auth) { 1954 *sta_out = sta; 1955 return 0; 1956 } 1957 1958 /* 1959 * TDLS link during setup - throw out frames to 1960 * peer. Allow TDLS-setup frames to unauthorized 1961 * peers for the special case of a link teardown 1962 * after a TDLS sta is removed due to being 1963 * unreachable. 1964 */ 1965 if (tdls_peer && !tdls_auth && 1966 !ieee80211_is_tdls_setup(skb)) 1967 return -EINVAL; 1968 } 1969 1970 } 1971 1972 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 1973 if (!sta) 1974 return -ENOLINK; 1975 break; 1976 default: 1977 return -EINVAL; 1978 } 1979 1980 *sta_out = sta ?: ERR_PTR(-ENOENT); 1981 return 0; 1982 } 1983 1984 /** 1985 * ieee80211_build_hdr - build 802.11 header in the given frame 1986 * @sdata: virtual interface to build the header for 1987 * @skb: the skb to build the header in 1988 * @info_flags: skb flags to set 1989 * 1990 * This function takes the skb with 802.3 header and reformats the header to 1991 * the appropriate IEEE 802.11 header based on which interface the packet is 1992 * being transmitted on. 1993 * 1994 * Note that this function also takes care of the TX status request and 1995 * potential unsharing of the SKB - this needs to be interleaved with the 1996 * header building. 1997 * 1998 * The function requires the read-side RCU lock held 1999 * 2000 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2001 */ 2002 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2003 struct sk_buff *skb, u32 info_flags, 2004 struct sta_info *sta) 2005 { 2006 struct ieee80211_local *local = sdata->local; 2007 struct ieee80211_tx_info *info; 2008 int head_need; 2009 u16 ethertype, hdrlen, meshhdrlen = 0; 2010 __le16 fc; 2011 struct ieee80211_hdr hdr; 2012 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2013 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2014 const u8 *encaps_data; 2015 int encaps_len, skip_header_bytes; 2016 int nh_pos, h_pos; 2017 bool wme_sta = false, authorized = false; 2018 bool tdls_peer; 2019 bool multicast; 2020 u16 info_id = 0; 2021 struct ieee80211_chanctx_conf *chanctx_conf; 2022 struct ieee80211_sub_if_data *ap_sdata; 2023 enum ieee80211_band band; 2024 int ret; 2025 2026 if (IS_ERR(sta)) 2027 sta = NULL; 2028 2029 /* convert Ethernet header to proper 802.11 header (based on 2030 * operation mode) */ 2031 ethertype = (skb->data[12] << 8) | skb->data[13]; 2032 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2033 2034 switch (sdata->vif.type) { 2035 case NL80211_IFTYPE_AP_VLAN: 2036 if (sdata->wdev.use_4addr) { 2037 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2038 /* RA TA DA SA */ 2039 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2040 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2041 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2042 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2043 hdrlen = 30; 2044 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2045 wme_sta = sta->sta.wme; 2046 } 2047 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2048 u.ap); 2049 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2050 if (!chanctx_conf) { 2051 ret = -ENOTCONN; 2052 goto free; 2053 } 2054 band = chanctx_conf->def.chan->band; 2055 if (sdata->wdev.use_4addr) 2056 break; 2057 /* fall through */ 2058 case NL80211_IFTYPE_AP: 2059 if (sdata->vif.type == NL80211_IFTYPE_AP) 2060 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2061 if (!chanctx_conf) { 2062 ret = -ENOTCONN; 2063 goto free; 2064 } 2065 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2066 /* DA BSSID SA */ 2067 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2068 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2069 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2070 hdrlen = 24; 2071 band = chanctx_conf->def.chan->band; 2072 break; 2073 case NL80211_IFTYPE_WDS: 2074 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2075 /* RA TA DA SA */ 2076 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2077 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2078 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2079 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2080 hdrlen = 30; 2081 /* 2082 * This is the exception! WDS style interfaces are prohibited 2083 * when channel contexts are in used so this must be valid 2084 */ 2085 band = local->hw.conf.chandef.chan->band; 2086 break; 2087 #ifdef CONFIG_MAC80211_MESH 2088 case NL80211_IFTYPE_MESH_POINT: 2089 if (!is_multicast_ether_addr(skb->data)) { 2090 struct sta_info *next_hop; 2091 bool mpp_lookup = true; 2092 2093 mpath = mesh_path_lookup(sdata, skb->data); 2094 if (mpath) { 2095 mpp_lookup = false; 2096 next_hop = rcu_dereference(mpath->next_hop); 2097 if (!next_hop || 2098 !(mpath->flags & (MESH_PATH_ACTIVE | 2099 MESH_PATH_RESOLVING))) 2100 mpp_lookup = true; 2101 } 2102 2103 if (mpp_lookup) 2104 mppath = mpp_path_lookup(sdata, skb->data); 2105 2106 if (mppath && mpath) 2107 mesh_path_del(mpath->sdata, mpath->dst); 2108 } 2109 2110 /* 2111 * Use address extension if it is a packet from 2112 * another interface or if we know the destination 2113 * is being proxied by a portal (i.e. portal address 2114 * differs from proxied address) 2115 */ 2116 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2117 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2118 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2119 skb->data, skb->data + ETH_ALEN); 2120 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2121 NULL, NULL); 2122 } else { 2123 /* DS -> MBSS (802.11-2012 13.11.3.3). 2124 * For unicast with unknown forwarding information, 2125 * destination might be in the MBSS or if that fails 2126 * forwarded to another mesh gate. In either case 2127 * resolution will be handled in ieee80211_xmit(), so 2128 * leave the original DA. This also works for mcast */ 2129 const u8 *mesh_da = skb->data; 2130 2131 if (mppath) 2132 mesh_da = mppath->mpp; 2133 else if (mpath) 2134 mesh_da = mpath->dst; 2135 2136 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2137 mesh_da, sdata->vif.addr); 2138 if (is_multicast_ether_addr(mesh_da)) 2139 /* DA TA mSA AE:SA */ 2140 meshhdrlen = ieee80211_new_mesh_header( 2141 sdata, &mesh_hdr, 2142 skb->data + ETH_ALEN, NULL); 2143 else 2144 /* RA TA mDA mSA AE:DA SA */ 2145 meshhdrlen = ieee80211_new_mesh_header( 2146 sdata, &mesh_hdr, skb->data, 2147 skb->data + ETH_ALEN); 2148 2149 } 2150 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2151 if (!chanctx_conf) { 2152 ret = -ENOTCONN; 2153 goto free; 2154 } 2155 band = chanctx_conf->def.chan->band; 2156 break; 2157 #endif 2158 case NL80211_IFTYPE_STATION: 2159 /* we already did checks when looking up the RA STA */ 2160 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2161 2162 if (tdls_peer) { 2163 /* DA SA BSSID */ 2164 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2165 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2166 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2167 hdrlen = 24; 2168 } else if (sdata->u.mgd.use_4addr && 2169 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2170 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2171 IEEE80211_FCTL_TODS); 2172 /* RA TA DA SA */ 2173 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2174 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2175 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2176 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2177 hdrlen = 30; 2178 } else { 2179 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2180 /* BSSID SA DA */ 2181 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2182 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2183 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2184 hdrlen = 24; 2185 } 2186 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2187 if (!chanctx_conf) { 2188 ret = -ENOTCONN; 2189 goto free; 2190 } 2191 band = chanctx_conf->def.chan->band; 2192 break; 2193 case NL80211_IFTYPE_OCB: 2194 /* DA SA BSSID */ 2195 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2196 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2197 eth_broadcast_addr(hdr.addr3); 2198 hdrlen = 24; 2199 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2200 if (!chanctx_conf) { 2201 ret = -ENOTCONN; 2202 goto free; 2203 } 2204 band = chanctx_conf->def.chan->band; 2205 break; 2206 case NL80211_IFTYPE_ADHOC: 2207 /* DA SA BSSID */ 2208 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2209 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2210 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2211 hdrlen = 24; 2212 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2213 if (!chanctx_conf) { 2214 ret = -ENOTCONN; 2215 goto free; 2216 } 2217 band = chanctx_conf->def.chan->band; 2218 break; 2219 default: 2220 ret = -EINVAL; 2221 goto free; 2222 } 2223 2224 multicast = is_multicast_ether_addr(hdr.addr1); 2225 2226 /* sta is always NULL for mesh */ 2227 if (sta) { 2228 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2229 wme_sta = sta->sta.wme; 2230 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2231 /* For mesh, the use of the QoS header is mandatory */ 2232 wme_sta = true; 2233 } 2234 2235 /* receiver does QoS (which also means we do) use it */ 2236 if (wme_sta) { 2237 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2238 hdrlen += 2; 2239 } 2240 2241 /* 2242 * Drop unicast frames to unauthorised stations unless they are 2243 * EAPOL frames from the local station. 2244 */ 2245 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2246 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2247 !multicast && !authorized && 2248 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2249 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2251 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2252 sdata->name, hdr.addr1); 2253 #endif 2254 2255 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2256 2257 ret = -EPERM; 2258 goto free; 2259 } 2260 2261 if (unlikely(!multicast && skb->sk && 2262 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2263 struct sk_buff *ack_skb = skb_clone_sk(skb); 2264 2265 if (ack_skb) { 2266 unsigned long flags; 2267 int id; 2268 2269 spin_lock_irqsave(&local->ack_status_lock, flags); 2270 id = idr_alloc(&local->ack_status_frames, ack_skb, 2271 1, 0x10000, GFP_ATOMIC); 2272 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2273 2274 if (id >= 0) { 2275 info_id = id; 2276 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2277 } else { 2278 kfree_skb(ack_skb); 2279 } 2280 } 2281 } 2282 2283 /* 2284 * If the skb is shared we need to obtain our own copy. 2285 */ 2286 if (skb_shared(skb)) { 2287 struct sk_buff *tmp_skb = skb; 2288 2289 /* can't happen -- skb is a clone if info_id != 0 */ 2290 WARN_ON(info_id); 2291 2292 skb = skb_clone(skb, GFP_ATOMIC); 2293 kfree_skb(tmp_skb); 2294 2295 if (!skb) { 2296 ret = -ENOMEM; 2297 goto free; 2298 } 2299 } 2300 2301 hdr.frame_control = fc; 2302 hdr.duration_id = 0; 2303 hdr.seq_ctrl = 0; 2304 2305 skip_header_bytes = ETH_HLEN; 2306 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2307 encaps_data = bridge_tunnel_header; 2308 encaps_len = sizeof(bridge_tunnel_header); 2309 skip_header_bytes -= 2; 2310 } else if (ethertype >= ETH_P_802_3_MIN) { 2311 encaps_data = rfc1042_header; 2312 encaps_len = sizeof(rfc1042_header); 2313 skip_header_bytes -= 2; 2314 } else { 2315 encaps_data = NULL; 2316 encaps_len = 0; 2317 } 2318 2319 nh_pos = skb_network_header(skb) - skb->data; 2320 h_pos = skb_transport_header(skb) - skb->data; 2321 2322 skb_pull(skb, skip_header_bytes); 2323 nh_pos -= skip_header_bytes; 2324 h_pos -= skip_header_bytes; 2325 2326 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2327 2328 /* 2329 * So we need to modify the skb header and hence need a copy of 2330 * that. The head_need variable above doesn't, so far, include 2331 * the needed header space that we don't need right away. If we 2332 * can, then we don't reallocate right now but only after the 2333 * frame arrives at the master device (if it does...) 2334 * 2335 * If we cannot, however, then we will reallocate to include all 2336 * the ever needed space. Also, if we need to reallocate it anyway, 2337 * make it big enough for everything we may ever need. 2338 */ 2339 2340 if (head_need > 0 || skb_cloned(skb)) { 2341 head_need += sdata->encrypt_headroom; 2342 head_need += local->tx_headroom; 2343 head_need = max_t(int, 0, head_need); 2344 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2345 ieee80211_free_txskb(&local->hw, skb); 2346 skb = NULL; 2347 return ERR_PTR(-ENOMEM); 2348 } 2349 } 2350 2351 if (encaps_data) { 2352 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2353 nh_pos += encaps_len; 2354 h_pos += encaps_len; 2355 } 2356 2357 #ifdef CONFIG_MAC80211_MESH 2358 if (meshhdrlen > 0) { 2359 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2360 nh_pos += meshhdrlen; 2361 h_pos += meshhdrlen; 2362 } 2363 #endif 2364 2365 if (ieee80211_is_data_qos(fc)) { 2366 __le16 *qos_control; 2367 2368 qos_control = (__le16 *) skb_push(skb, 2); 2369 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2370 /* 2371 * Maybe we could actually set some fields here, for now just 2372 * initialise to zero to indicate no special operation. 2373 */ 2374 *qos_control = 0; 2375 } else 2376 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2377 2378 nh_pos += hdrlen; 2379 h_pos += hdrlen; 2380 2381 /* Update skb pointers to various headers since this modified frame 2382 * is going to go through Linux networking code that may potentially 2383 * need things like pointer to IP header. */ 2384 skb_set_mac_header(skb, 0); 2385 skb_set_network_header(skb, nh_pos); 2386 skb_set_transport_header(skb, h_pos); 2387 2388 info = IEEE80211_SKB_CB(skb); 2389 memset(info, 0, sizeof(*info)); 2390 2391 info->flags = info_flags; 2392 info->ack_frame_id = info_id; 2393 info->band = band; 2394 2395 return skb; 2396 free: 2397 kfree_skb(skb); 2398 return ERR_PTR(ret); 2399 } 2400 2401 /* 2402 * fast-xmit overview 2403 * 2404 * The core idea of this fast-xmit is to remove per-packet checks by checking 2405 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2406 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2407 * much less work can be done per packet. For example, fragmentation must be 2408 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2409 * in the code here. 2410 * 2411 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2412 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2413 * 2414 * The most difficult part of this is that when any of these assumptions 2415 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2416 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2417 * since the per-packet code no longer checks the conditions. This is reflected 2418 * by the calls to these functions throughout the rest of the code, and must be 2419 * maintained if any of the TX path checks change. 2420 */ 2421 2422 void ieee80211_check_fast_xmit(struct sta_info *sta) 2423 { 2424 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2425 struct ieee80211_local *local = sta->local; 2426 struct ieee80211_sub_if_data *sdata = sta->sdata; 2427 struct ieee80211_hdr *hdr = (void *)build.hdr; 2428 struct ieee80211_chanctx_conf *chanctx_conf; 2429 __le16 fc; 2430 2431 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2432 return; 2433 2434 /* Locking here protects both the pointer itself, and against concurrent 2435 * invocations winning data access races to, e.g., the key pointer that 2436 * is used. 2437 * Without it, the invocation of this function right after the key 2438 * pointer changes wouldn't be sufficient, as another CPU could access 2439 * the pointer, then stall, and then do the cache update after the CPU 2440 * that invalidated the key. 2441 * With the locking, such scenarios cannot happen as the check for the 2442 * key and the fast-tx assignment are done atomically, so the CPU that 2443 * modifies the key will either wait or other one will see the key 2444 * cleared/changed already. 2445 */ 2446 spin_lock_bh(&sta->lock); 2447 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2448 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2449 sdata->vif.type == NL80211_IFTYPE_STATION) 2450 goto out; 2451 2452 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2453 goto out; 2454 2455 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2456 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2457 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) 2458 goto out; 2459 2460 if (sdata->noack_map) 2461 goto out; 2462 2463 /* fast-xmit doesn't handle fragmentation at all */ 2464 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2465 !local->ops->set_frag_threshold) 2466 goto out; 2467 2468 rcu_read_lock(); 2469 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2470 if (!chanctx_conf) { 2471 rcu_read_unlock(); 2472 goto out; 2473 } 2474 build.band = chanctx_conf->def.chan->band; 2475 rcu_read_unlock(); 2476 2477 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2478 2479 switch (sdata->vif.type) { 2480 case NL80211_IFTYPE_ADHOC: 2481 /* DA SA BSSID */ 2482 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2483 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2484 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2485 build.hdr_len = 24; 2486 break; 2487 case NL80211_IFTYPE_STATION: 2488 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2489 /* DA SA BSSID */ 2490 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2491 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2492 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2493 build.hdr_len = 24; 2494 break; 2495 } 2496 2497 if (sdata->u.mgd.use_4addr) { 2498 /* non-regular ethertype cannot use the fastpath */ 2499 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2500 IEEE80211_FCTL_TODS); 2501 /* RA TA DA SA */ 2502 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2503 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2504 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2505 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2506 build.hdr_len = 30; 2507 break; 2508 } 2509 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2510 /* BSSID SA DA */ 2511 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2512 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2513 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2514 build.hdr_len = 24; 2515 break; 2516 case NL80211_IFTYPE_AP_VLAN: 2517 if (sdata->wdev.use_4addr) { 2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2519 IEEE80211_FCTL_TODS); 2520 /* RA TA DA SA */ 2521 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2522 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2523 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2524 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2525 build.hdr_len = 30; 2526 break; 2527 } 2528 /* fall through */ 2529 case NL80211_IFTYPE_AP: 2530 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2531 /* DA BSSID SA */ 2532 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2533 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2534 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2535 build.hdr_len = 24; 2536 break; 2537 default: 2538 /* not handled on fast-xmit */ 2539 goto out; 2540 } 2541 2542 if (sta->sta.wme) { 2543 build.hdr_len += 2; 2544 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2545 } 2546 2547 /* We store the key here so there's no point in using rcu_dereference() 2548 * but that's fine because the code that changes the pointers will call 2549 * this function after doing so. For a single CPU that would be enough, 2550 * for multiple see the comment above. 2551 */ 2552 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2553 if (!build.key) 2554 build.key = rcu_access_pointer(sdata->default_unicast_key); 2555 if (build.key) { 2556 bool gen_iv, iv_spc, mmic; 2557 2558 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2559 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2560 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2561 2562 /* don't handle software crypto */ 2563 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2564 goto out; 2565 2566 switch (build.key->conf.cipher) { 2567 case WLAN_CIPHER_SUITE_CCMP: 2568 case WLAN_CIPHER_SUITE_CCMP_256: 2569 /* add fixed key ID */ 2570 if (gen_iv) { 2571 (build.hdr + build.hdr_len)[3] = 2572 0x20 | (build.key->conf.keyidx << 6); 2573 build.pn_offs = build.hdr_len; 2574 } 2575 if (gen_iv || iv_spc) 2576 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2577 break; 2578 case WLAN_CIPHER_SUITE_GCMP: 2579 case WLAN_CIPHER_SUITE_GCMP_256: 2580 /* add fixed key ID */ 2581 if (gen_iv) { 2582 (build.hdr + build.hdr_len)[3] = 2583 0x20 | (build.key->conf.keyidx << 6); 2584 build.pn_offs = build.hdr_len; 2585 } 2586 if (gen_iv || iv_spc) 2587 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2588 break; 2589 case WLAN_CIPHER_SUITE_TKIP: 2590 /* cannot handle MMIC or IV generation in xmit-fast */ 2591 if (mmic || gen_iv) 2592 goto out; 2593 if (iv_spc) 2594 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2595 break; 2596 case WLAN_CIPHER_SUITE_WEP40: 2597 case WLAN_CIPHER_SUITE_WEP104: 2598 /* cannot handle IV generation in fast-xmit */ 2599 if (gen_iv) 2600 goto out; 2601 if (iv_spc) 2602 build.hdr_len += IEEE80211_WEP_IV_LEN; 2603 break; 2604 case WLAN_CIPHER_SUITE_AES_CMAC: 2605 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2606 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2607 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2608 WARN(1, 2609 "management cipher suite 0x%x enabled for data\n", 2610 build.key->conf.cipher); 2611 goto out; 2612 default: 2613 /* we don't know how to generate IVs for this at all */ 2614 if (WARN_ON(gen_iv)) 2615 goto out; 2616 /* pure hardware keys are OK, of course */ 2617 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2618 break; 2619 /* cipher scheme might require space allocation */ 2620 if (iv_spc && 2621 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2622 goto out; 2623 if (iv_spc) 2624 build.hdr_len += build.key->conf.iv_len; 2625 } 2626 2627 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2628 } 2629 2630 hdr->frame_control = fc; 2631 2632 memcpy(build.hdr + build.hdr_len, 2633 rfc1042_header, sizeof(rfc1042_header)); 2634 build.hdr_len += sizeof(rfc1042_header); 2635 2636 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2637 /* if the kmemdup fails, continue w/o fast_tx */ 2638 if (!fast_tx) 2639 goto out; 2640 2641 out: 2642 /* we might have raced against another call to this function */ 2643 old = rcu_dereference_protected(sta->fast_tx, 2644 lockdep_is_held(&sta->lock)); 2645 rcu_assign_pointer(sta->fast_tx, fast_tx); 2646 if (old) 2647 kfree_rcu(old, rcu_head); 2648 spin_unlock_bh(&sta->lock); 2649 } 2650 2651 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2652 { 2653 struct sta_info *sta; 2654 2655 rcu_read_lock(); 2656 list_for_each_entry_rcu(sta, &local->sta_list, list) 2657 ieee80211_check_fast_xmit(sta); 2658 rcu_read_unlock(); 2659 } 2660 2661 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2662 { 2663 struct ieee80211_local *local = sdata->local; 2664 struct sta_info *sta; 2665 2666 rcu_read_lock(); 2667 2668 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2669 if (sdata != sta->sdata && 2670 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2671 continue; 2672 ieee80211_check_fast_xmit(sta); 2673 } 2674 2675 rcu_read_unlock(); 2676 } 2677 2678 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2679 { 2680 struct ieee80211_fast_tx *fast_tx; 2681 2682 spin_lock_bh(&sta->lock); 2683 fast_tx = rcu_dereference_protected(sta->fast_tx, 2684 lockdep_is_held(&sta->lock)); 2685 RCU_INIT_POINTER(sta->fast_tx, NULL); 2686 spin_unlock_bh(&sta->lock); 2687 2688 if (fast_tx) 2689 kfree_rcu(fast_tx, rcu_head); 2690 } 2691 2692 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2693 struct net_device *dev, struct sta_info *sta, 2694 struct ieee80211_fast_tx *fast_tx, 2695 struct sk_buff *skb) 2696 { 2697 struct ieee80211_local *local = sdata->local; 2698 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2699 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2700 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2701 struct ethhdr eth; 2702 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2703 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2704 struct ieee80211_tx_data tx; 2705 ieee80211_tx_result r; 2706 struct tid_ampdu_tx *tid_tx = NULL; 2707 u8 tid = IEEE80211_NUM_TIDS; 2708 2709 /* control port protocol needs a lot of special handling */ 2710 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2711 return false; 2712 2713 /* only RFC 1042 SNAP */ 2714 if (ethertype < ETH_P_802_3_MIN) 2715 return false; 2716 2717 /* don't handle TX status request here either */ 2718 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2719 return false; 2720 2721 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2722 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2723 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2724 if (tid_tx) { 2725 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2726 return false; 2727 if (tid_tx->timeout) 2728 tid_tx->last_tx = jiffies; 2729 } 2730 } 2731 2732 /* after this point (skb is modified) we cannot return false */ 2733 2734 if (skb_shared(skb)) { 2735 struct sk_buff *tmp_skb = skb; 2736 2737 skb = skb_clone(skb, GFP_ATOMIC); 2738 kfree_skb(tmp_skb); 2739 2740 if (!skb) 2741 return true; 2742 } 2743 2744 ieee80211_tx_stats(dev, skb->len + extra_head); 2745 2746 /* will not be crypto-handled beyond what we do here, so use false 2747 * as the may-encrypt argument for the resize to not account for 2748 * more room than we already have in 'extra_head' 2749 */ 2750 if (unlikely(ieee80211_skb_resize(sdata, skb, 2751 max_t(int, extra_head + hw_headroom - 2752 skb_headroom(skb), 0), 2753 false))) { 2754 kfree_skb(skb); 2755 return true; 2756 } 2757 2758 memcpy(ð, skb->data, ETH_HLEN - 2); 2759 hdr = (void *)skb_push(skb, extra_head); 2760 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 2761 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 2762 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 2763 2764 memset(info, 0, sizeof(*info)); 2765 info->band = fast_tx->band; 2766 info->control.vif = &sdata->vif; 2767 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 2768 IEEE80211_TX_CTL_DONTFRAG | 2769 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 2770 2771 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2772 *ieee80211_get_qos_ctl(hdr) = tid; 2773 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 2774 } else { 2775 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2776 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 2777 sdata->sequence_number += 0x10; 2778 } 2779 2780 sta->tx_msdu[tid]++; 2781 2782 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2783 2784 __skb_queue_head_init(&tx.skbs); 2785 2786 tx.flags = IEEE80211_TX_UNICAST; 2787 tx.local = local; 2788 tx.sdata = sdata; 2789 tx.sta = sta; 2790 tx.key = fast_tx->key; 2791 2792 if (fast_tx->key) 2793 info->control.hw_key = &fast_tx->key->conf; 2794 2795 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 2796 tx.skb = skb; 2797 r = ieee80211_tx_h_rate_ctrl(&tx); 2798 skb = tx.skb; 2799 tx.skb = NULL; 2800 2801 if (r != TX_CONTINUE) { 2802 if (r != TX_QUEUED) 2803 kfree_skb(skb); 2804 return true; 2805 } 2806 } 2807 2808 /* statistics normally done by ieee80211_tx_h_stats (but that 2809 * has to consider fragmentation, so is more complex) 2810 */ 2811 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len; 2812 sta->tx_packets[skb_get_queue_mapping(skb)]++; 2813 2814 if (fast_tx->pn_offs) { 2815 u64 pn; 2816 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 2817 2818 switch (fast_tx->key->conf.cipher) { 2819 case WLAN_CIPHER_SUITE_CCMP: 2820 case WLAN_CIPHER_SUITE_CCMP_256: 2821 case WLAN_CIPHER_SUITE_GCMP: 2822 case WLAN_CIPHER_SUITE_GCMP_256: 2823 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 2824 crypto_hdr[0] = pn; 2825 crypto_hdr[1] = pn >> 8; 2826 crypto_hdr[4] = pn >> 16; 2827 crypto_hdr[5] = pn >> 24; 2828 crypto_hdr[6] = pn >> 32; 2829 crypto_hdr[7] = pn >> 40; 2830 break; 2831 } 2832 } 2833 2834 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2835 sdata = container_of(sdata->bss, 2836 struct ieee80211_sub_if_data, u.ap); 2837 2838 __skb_queue_tail(&tx.skbs, skb); 2839 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 2840 return true; 2841 } 2842 2843 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 2844 struct net_device *dev, 2845 u32 info_flags) 2846 { 2847 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2848 struct sta_info *sta; 2849 struct sk_buff *next; 2850 2851 if (unlikely(skb->len < ETH_HLEN)) { 2852 kfree_skb(skb); 2853 return; 2854 } 2855 2856 rcu_read_lock(); 2857 2858 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 2859 goto out_free; 2860 2861 if (!IS_ERR_OR_NULL(sta)) { 2862 struct ieee80211_fast_tx *fast_tx; 2863 2864 fast_tx = rcu_dereference(sta->fast_tx); 2865 2866 if (fast_tx && 2867 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 2868 goto out; 2869 } 2870 2871 if (skb_is_gso(skb)) { 2872 struct sk_buff *segs; 2873 2874 segs = skb_gso_segment(skb, 0); 2875 if (IS_ERR(segs)) { 2876 goto out_free; 2877 } else if (segs) { 2878 consume_skb(skb); 2879 skb = segs; 2880 } 2881 } else { 2882 /* we cannot process non-linear frames on this path */ 2883 if (skb_linearize(skb)) { 2884 kfree_skb(skb); 2885 goto out; 2886 } 2887 2888 /* the frame could be fragmented, software-encrypted, and other 2889 * things so we cannot really handle checksum offload with it - 2890 * fix it up in software before we handle anything else. 2891 */ 2892 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2893 skb_set_transport_header(skb, 2894 skb_checksum_start_offset(skb)); 2895 if (skb_checksum_help(skb)) 2896 goto out_free; 2897 } 2898 } 2899 2900 next = skb; 2901 while (next) { 2902 skb = next; 2903 next = skb->next; 2904 2905 skb->prev = NULL; 2906 skb->next = NULL; 2907 2908 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2909 if (IS_ERR(skb)) 2910 goto out; 2911 2912 ieee80211_tx_stats(dev, skb->len); 2913 2914 ieee80211_xmit(sdata, sta, skb); 2915 } 2916 goto out; 2917 out_free: 2918 kfree_skb(skb); 2919 out: 2920 rcu_read_unlock(); 2921 } 2922 2923 /** 2924 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 2925 * @skb: packet to be sent 2926 * @dev: incoming interface 2927 * 2928 * On failure skb will be freed. 2929 */ 2930 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 2931 struct net_device *dev) 2932 { 2933 __ieee80211_subif_start_xmit(skb, dev, 0); 2934 return NETDEV_TX_OK; 2935 } 2936 2937 struct sk_buff * 2938 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 2939 struct sk_buff *skb, u32 info_flags) 2940 { 2941 struct ieee80211_hdr *hdr; 2942 struct ieee80211_tx_data tx = { 2943 .local = sdata->local, 2944 .sdata = sdata, 2945 }; 2946 struct sta_info *sta; 2947 2948 rcu_read_lock(); 2949 2950 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 2951 kfree_skb(skb); 2952 skb = ERR_PTR(-EINVAL); 2953 goto out; 2954 } 2955 2956 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2957 if (IS_ERR(skb)) 2958 goto out; 2959 2960 hdr = (void *)skb->data; 2961 tx.sta = sta_info_get(sdata, hdr->addr1); 2962 tx.skb = skb; 2963 2964 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 2965 rcu_read_unlock(); 2966 kfree_skb(skb); 2967 return ERR_PTR(-EINVAL); 2968 } 2969 2970 out: 2971 rcu_read_unlock(); 2972 return skb; 2973 } 2974 2975 /* 2976 * ieee80211_clear_tx_pending may not be called in a context where 2977 * it is possible that it packets could come in again. 2978 */ 2979 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2980 { 2981 struct sk_buff *skb; 2982 int i; 2983 2984 for (i = 0; i < local->hw.queues; i++) { 2985 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2986 ieee80211_free_txskb(&local->hw, skb); 2987 } 2988 } 2989 2990 /* 2991 * Returns false if the frame couldn't be transmitted but was queued instead, 2992 * which in this case means re-queued -- take as an indication to stop sending 2993 * more pending frames. 2994 */ 2995 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2996 struct sk_buff *skb) 2997 { 2998 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2999 struct ieee80211_sub_if_data *sdata; 3000 struct sta_info *sta; 3001 struct ieee80211_hdr *hdr; 3002 bool result; 3003 struct ieee80211_chanctx_conf *chanctx_conf; 3004 3005 sdata = vif_to_sdata(info->control.vif); 3006 3007 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3008 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3009 if (unlikely(!chanctx_conf)) { 3010 dev_kfree_skb(skb); 3011 return true; 3012 } 3013 info->band = chanctx_conf->def.chan->band; 3014 result = ieee80211_tx(sdata, NULL, skb, true); 3015 } else { 3016 struct sk_buff_head skbs; 3017 3018 __skb_queue_head_init(&skbs); 3019 __skb_queue_tail(&skbs, skb); 3020 3021 hdr = (struct ieee80211_hdr *)skb->data; 3022 sta = sta_info_get(sdata, hdr->addr1); 3023 3024 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3025 } 3026 3027 return result; 3028 } 3029 3030 /* 3031 * Transmit all pending packets. Called from tasklet. 3032 */ 3033 void ieee80211_tx_pending(unsigned long data) 3034 { 3035 struct ieee80211_local *local = (struct ieee80211_local *)data; 3036 unsigned long flags; 3037 int i; 3038 bool txok; 3039 3040 rcu_read_lock(); 3041 3042 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3043 for (i = 0; i < local->hw.queues; i++) { 3044 /* 3045 * If queue is stopped by something other than due to pending 3046 * frames, or we have no pending frames, proceed to next queue. 3047 */ 3048 if (local->queue_stop_reasons[i] || 3049 skb_queue_empty(&local->pending[i])) 3050 continue; 3051 3052 while (!skb_queue_empty(&local->pending[i])) { 3053 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3055 3056 if (WARN_ON(!info->control.vif)) { 3057 ieee80211_free_txskb(&local->hw, skb); 3058 continue; 3059 } 3060 3061 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3062 flags); 3063 3064 txok = ieee80211_tx_pending_skb(local, skb); 3065 spin_lock_irqsave(&local->queue_stop_reason_lock, 3066 flags); 3067 if (!txok) 3068 break; 3069 } 3070 3071 if (skb_queue_empty(&local->pending[i])) 3072 ieee80211_propagate_queue_wake(local, i); 3073 } 3074 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3075 3076 rcu_read_unlock(); 3077 } 3078 3079 /* functions for drivers to get certain frames */ 3080 3081 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3082 struct ps_data *ps, struct sk_buff *skb, 3083 bool is_template) 3084 { 3085 u8 *pos, *tim; 3086 int aid0 = 0; 3087 int i, have_bits = 0, n1, n2; 3088 3089 /* Generate bitmap for TIM only if there are any STAs in power save 3090 * mode. */ 3091 if (atomic_read(&ps->num_sta_ps) > 0) 3092 /* in the hope that this is faster than 3093 * checking byte-for-byte */ 3094 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3095 IEEE80211_MAX_AID+1); 3096 if (!is_template) { 3097 if (ps->dtim_count == 0) 3098 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3099 else 3100 ps->dtim_count--; 3101 } 3102 3103 tim = pos = (u8 *) skb_put(skb, 6); 3104 *pos++ = WLAN_EID_TIM; 3105 *pos++ = 4; 3106 *pos++ = ps->dtim_count; 3107 *pos++ = sdata->vif.bss_conf.dtim_period; 3108 3109 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3110 aid0 = 1; 3111 3112 ps->dtim_bc_mc = aid0 == 1; 3113 3114 if (have_bits) { 3115 /* Find largest even number N1 so that bits numbered 1 through 3116 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3117 * (N2 + 1) x 8 through 2007 are 0. */ 3118 n1 = 0; 3119 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3120 if (ps->tim[i]) { 3121 n1 = i & 0xfe; 3122 break; 3123 } 3124 } 3125 n2 = n1; 3126 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3127 if (ps->tim[i]) { 3128 n2 = i; 3129 break; 3130 } 3131 } 3132 3133 /* Bitmap control */ 3134 *pos++ = n1 | aid0; 3135 /* Part Virt Bitmap */ 3136 skb_put(skb, n2 - n1); 3137 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3138 3139 tim[1] = n2 - n1 + 4; 3140 } else { 3141 *pos++ = aid0; /* Bitmap control */ 3142 *pos++ = 0; /* Part Virt Bitmap */ 3143 } 3144 } 3145 3146 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3147 struct ps_data *ps, struct sk_buff *skb, 3148 bool is_template) 3149 { 3150 struct ieee80211_local *local = sdata->local; 3151 3152 /* 3153 * Not very nice, but we want to allow the driver to call 3154 * ieee80211_beacon_get() as a response to the set_tim() 3155 * callback. That, however, is already invoked under the 3156 * sta_lock to guarantee consistent and race-free update 3157 * of the tim bitmap in mac80211 and the driver. 3158 */ 3159 if (local->tim_in_locked_section) { 3160 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3161 } else { 3162 spin_lock_bh(&local->tim_lock); 3163 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3164 spin_unlock_bh(&local->tim_lock); 3165 } 3166 3167 return 0; 3168 } 3169 3170 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3171 struct beacon_data *beacon) 3172 { 3173 struct probe_resp *resp; 3174 u8 *beacon_data; 3175 size_t beacon_data_len; 3176 int i; 3177 u8 count = beacon->csa_current_counter; 3178 3179 switch (sdata->vif.type) { 3180 case NL80211_IFTYPE_AP: 3181 beacon_data = beacon->tail; 3182 beacon_data_len = beacon->tail_len; 3183 break; 3184 case NL80211_IFTYPE_ADHOC: 3185 beacon_data = beacon->head; 3186 beacon_data_len = beacon->head_len; 3187 break; 3188 case NL80211_IFTYPE_MESH_POINT: 3189 beacon_data = beacon->head; 3190 beacon_data_len = beacon->head_len; 3191 break; 3192 default: 3193 return; 3194 } 3195 3196 rcu_read_lock(); 3197 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3198 resp = rcu_dereference(sdata->u.ap.probe_resp); 3199 3200 if (beacon->csa_counter_offsets[i]) { 3201 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3202 beacon_data_len)) { 3203 rcu_read_unlock(); 3204 return; 3205 } 3206 3207 beacon_data[beacon->csa_counter_offsets[i]] = count; 3208 } 3209 3210 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3211 resp->data[resp->csa_counter_offsets[i]] = count; 3212 } 3213 rcu_read_unlock(); 3214 } 3215 3216 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3217 { 3218 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3219 struct beacon_data *beacon = NULL; 3220 u8 count = 0; 3221 3222 rcu_read_lock(); 3223 3224 if (sdata->vif.type == NL80211_IFTYPE_AP) 3225 beacon = rcu_dereference(sdata->u.ap.beacon); 3226 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3227 beacon = rcu_dereference(sdata->u.ibss.presp); 3228 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3229 beacon = rcu_dereference(sdata->u.mesh.beacon); 3230 3231 if (!beacon) 3232 goto unlock; 3233 3234 beacon->csa_current_counter--; 3235 3236 /* the counter should never reach 0 */ 3237 WARN_ON_ONCE(!beacon->csa_current_counter); 3238 count = beacon->csa_current_counter; 3239 3240 unlock: 3241 rcu_read_unlock(); 3242 return count; 3243 } 3244 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3245 3246 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3247 { 3248 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3249 struct beacon_data *beacon = NULL; 3250 u8 *beacon_data; 3251 size_t beacon_data_len; 3252 int ret = false; 3253 3254 if (!ieee80211_sdata_running(sdata)) 3255 return false; 3256 3257 rcu_read_lock(); 3258 if (vif->type == NL80211_IFTYPE_AP) { 3259 struct ieee80211_if_ap *ap = &sdata->u.ap; 3260 3261 beacon = rcu_dereference(ap->beacon); 3262 if (WARN_ON(!beacon || !beacon->tail)) 3263 goto out; 3264 beacon_data = beacon->tail; 3265 beacon_data_len = beacon->tail_len; 3266 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3268 3269 beacon = rcu_dereference(ifibss->presp); 3270 if (!beacon) 3271 goto out; 3272 3273 beacon_data = beacon->head; 3274 beacon_data_len = beacon->head_len; 3275 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3277 3278 beacon = rcu_dereference(ifmsh->beacon); 3279 if (!beacon) 3280 goto out; 3281 3282 beacon_data = beacon->head; 3283 beacon_data_len = beacon->head_len; 3284 } else { 3285 WARN_ON(1); 3286 goto out; 3287 } 3288 3289 if (!beacon->csa_counter_offsets[0]) 3290 goto out; 3291 3292 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3293 goto out; 3294 3295 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3296 ret = true; 3297 out: 3298 rcu_read_unlock(); 3299 3300 return ret; 3301 } 3302 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3303 3304 static struct sk_buff * 3305 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3306 struct ieee80211_vif *vif, 3307 struct ieee80211_mutable_offsets *offs, 3308 bool is_template) 3309 { 3310 struct ieee80211_local *local = hw_to_local(hw); 3311 struct beacon_data *beacon = NULL; 3312 struct sk_buff *skb = NULL; 3313 struct ieee80211_tx_info *info; 3314 struct ieee80211_sub_if_data *sdata = NULL; 3315 enum ieee80211_band band; 3316 struct ieee80211_tx_rate_control txrc; 3317 struct ieee80211_chanctx_conf *chanctx_conf; 3318 int csa_off_base = 0; 3319 3320 rcu_read_lock(); 3321 3322 sdata = vif_to_sdata(vif); 3323 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3324 3325 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3326 goto out; 3327 3328 if (offs) 3329 memset(offs, 0, sizeof(*offs)); 3330 3331 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3332 struct ieee80211_if_ap *ap = &sdata->u.ap; 3333 3334 beacon = rcu_dereference(ap->beacon); 3335 if (beacon) { 3336 if (beacon->csa_counter_offsets[0]) { 3337 if (!is_template) 3338 ieee80211_csa_update_counter(vif); 3339 3340 ieee80211_set_csa(sdata, beacon); 3341 } 3342 3343 /* 3344 * headroom, head length, 3345 * tail length and maximum TIM length 3346 */ 3347 skb = dev_alloc_skb(local->tx_headroom + 3348 beacon->head_len + 3349 beacon->tail_len + 256 + 3350 local->hw.extra_beacon_tailroom); 3351 if (!skb) 3352 goto out; 3353 3354 skb_reserve(skb, local->tx_headroom); 3355 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3356 beacon->head_len); 3357 3358 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3359 is_template); 3360 3361 if (offs) { 3362 offs->tim_offset = beacon->head_len; 3363 offs->tim_length = skb->len - beacon->head_len; 3364 3365 /* for AP the csa offsets are from tail */ 3366 csa_off_base = skb->len; 3367 } 3368 3369 if (beacon->tail) 3370 memcpy(skb_put(skb, beacon->tail_len), 3371 beacon->tail, beacon->tail_len); 3372 } else 3373 goto out; 3374 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3375 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3376 struct ieee80211_hdr *hdr; 3377 3378 beacon = rcu_dereference(ifibss->presp); 3379 if (!beacon) 3380 goto out; 3381 3382 if (beacon->csa_counter_offsets[0]) { 3383 if (!is_template) 3384 ieee80211_csa_update_counter(vif); 3385 3386 ieee80211_set_csa(sdata, beacon); 3387 } 3388 3389 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3390 local->hw.extra_beacon_tailroom); 3391 if (!skb) 3392 goto out; 3393 skb_reserve(skb, local->tx_headroom); 3394 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3395 beacon->head_len); 3396 3397 hdr = (struct ieee80211_hdr *) skb->data; 3398 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3399 IEEE80211_STYPE_BEACON); 3400 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3401 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3402 3403 beacon = rcu_dereference(ifmsh->beacon); 3404 if (!beacon) 3405 goto out; 3406 3407 if (beacon->csa_counter_offsets[0]) { 3408 if (!is_template) 3409 /* TODO: For mesh csa_counter is in TU, so 3410 * decrementing it by one isn't correct, but 3411 * for now we leave it consistent with overall 3412 * mac80211's behavior. 3413 */ 3414 ieee80211_csa_update_counter(vif); 3415 3416 ieee80211_set_csa(sdata, beacon); 3417 } 3418 3419 if (ifmsh->sync_ops) 3420 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3421 3422 skb = dev_alloc_skb(local->tx_headroom + 3423 beacon->head_len + 3424 256 + /* TIM IE */ 3425 beacon->tail_len + 3426 local->hw.extra_beacon_tailroom); 3427 if (!skb) 3428 goto out; 3429 skb_reserve(skb, local->tx_headroom); 3430 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3431 beacon->head_len); 3432 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3433 3434 if (offs) { 3435 offs->tim_offset = beacon->head_len; 3436 offs->tim_length = skb->len - beacon->head_len; 3437 } 3438 3439 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3440 beacon->tail_len); 3441 } else { 3442 WARN_ON(1); 3443 goto out; 3444 } 3445 3446 /* CSA offsets */ 3447 if (offs && beacon) { 3448 int i; 3449 3450 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3451 u16 csa_off = beacon->csa_counter_offsets[i]; 3452 3453 if (!csa_off) 3454 continue; 3455 3456 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3457 } 3458 } 3459 3460 band = chanctx_conf->def.chan->band; 3461 3462 info = IEEE80211_SKB_CB(skb); 3463 3464 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3465 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3466 info->band = band; 3467 3468 memset(&txrc, 0, sizeof(txrc)); 3469 txrc.hw = hw; 3470 txrc.sband = local->hw.wiphy->bands[band]; 3471 txrc.bss_conf = &sdata->vif.bss_conf; 3472 txrc.skb = skb; 3473 txrc.reported_rate.idx = -1; 3474 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3475 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3476 txrc.max_rate_idx = -1; 3477 else 3478 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3479 txrc.bss = true; 3480 rate_control_get_rate(sdata, NULL, &txrc); 3481 3482 info->control.vif = vif; 3483 3484 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3485 IEEE80211_TX_CTL_ASSIGN_SEQ | 3486 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3487 out: 3488 rcu_read_unlock(); 3489 return skb; 3490 3491 } 3492 3493 struct sk_buff * 3494 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3495 struct ieee80211_vif *vif, 3496 struct ieee80211_mutable_offsets *offs) 3497 { 3498 return __ieee80211_beacon_get(hw, vif, offs, true); 3499 } 3500 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3501 3502 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3503 struct ieee80211_vif *vif, 3504 u16 *tim_offset, u16 *tim_length) 3505 { 3506 struct ieee80211_mutable_offsets offs = {}; 3507 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3508 3509 if (tim_offset) 3510 *tim_offset = offs.tim_offset; 3511 3512 if (tim_length) 3513 *tim_length = offs.tim_length; 3514 3515 return bcn; 3516 } 3517 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3518 3519 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3520 struct ieee80211_vif *vif) 3521 { 3522 struct ieee80211_if_ap *ap = NULL; 3523 struct sk_buff *skb = NULL; 3524 struct probe_resp *presp = NULL; 3525 struct ieee80211_hdr *hdr; 3526 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3527 3528 if (sdata->vif.type != NL80211_IFTYPE_AP) 3529 return NULL; 3530 3531 rcu_read_lock(); 3532 3533 ap = &sdata->u.ap; 3534 presp = rcu_dereference(ap->probe_resp); 3535 if (!presp) 3536 goto out; 3537 3538 skb = dev_alloc_skb(presp->len); 3539 if (!skb) 3540 goto out; 3541 3542 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3543 3544 hdr = (struct ieee80211_hdr *) skb->data; 3545 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3546 3547 out: 3548 rcu_read_unlock(); 3549 return skb; 3550 } 3551 EXPORT_SYMBOL(ieee80211_proberesp_get); 3552 3553 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3554 struct ieee80211_vif *vif) 3555 { 3556 struct ieee80211_sub_if_data *sdata; 3557 struct ieee80211_if_managed *ifmgd; 3558 struct ieee80211_pspoll *pspoll; 3559 struct ieee80211_local *local; 3560 struct sk_buff *skb; 3561 3562 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3563 return NULL; 3564 3565 sdata = vif_to_sdata(vif); 3566 ifmgd = &sdata->u.mgd; 3567 local = sdata->local; 3568 3569 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3570 if (!skb) 3571 return NULL; 3572 3573 skb_reserve(skb, local->hw.extra_tx_headroom); 3574 3575 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3576 memset(pspoll, 0, sizeof(*pspoll)); 3577 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3578 IEEE80211_STYPE_PSPOLL); 3579 pspoll->aid = cpu_to_le16(ifmgd->aid); 3580 3581 /* aid in PS-Poll has its two MSBs each set to 1 */ 3582 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3583 3584 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3585 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3586 3587 return skb; 3588 } 3589 EXPORT_SYMBOL(ieee80211_pspoll_get); 3590 3591 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3592 struct ieee80211_vif *vif) 3593 { 3594 struct ieee80211_hdr_3addr *nullfunc; 3595 struct ieee80211_sub_if_data *sdata; 3596 struct ieee80211_if_managed *ifmgd; 3597 struct ieee80211_local *local; 3598 struct sk_buff *skb; 3599 3600 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3601 return NULL; 3602 3603 sdata = vif_to_sdata(vif); 3604 ifmgd = &sdata->u.mgd; 3605 local = sdata->local; 3606 3607 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3608 if (!skb) 3609 return NULL; 3610 3611 skb_reserve(skb, local->hw.extra_tx_headroom); 3612 3613 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3614 sizeof(*nullfunc)); 3615 memset(nullfunc, 0, sizeof(*nullfunc)); 3616 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3617 IEEE80211_STYPE_NULLFUNC | 3618 IEEE80211_FCTL_TODS); 3619 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3620 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3621 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3622 3623 return skb; 3624 } 3625 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3626 3627 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3628 const u8 *src_addr, 3629 const u8 *ssid, size_t ssid_len, 3630 size_t tailroom) 3631 { 3632 struct ieee80211_local *local = hw_to_local(hw); 3633 struct ieee80211_hdr_3addr *hdr; 3634 struct sk_buff *skb; 3635 size_t ie_ssid_len; 3636 u8 *pos; 3637 3638 ie_ssid_len = 2 + ssid_len; 3639 3640 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3641 ie_ssid_len + tailroom); 3642 if (!skb) 3643 return NULL; 3644 3645 skb_reserve(skb, local->hw.extra_tx_headroom); 3646 3647 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3648 memset(hdr, 0, sizeof(*hdr)); 3649 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3650 IEEE80211_STYPE_PROBE_REQ); 3651 eth_broadcast_addr(hdr->addr1); 3652 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3653 eth_broadcast_addr(hdr->addr3); 3654 3655 pos = skb_put(skb, ie_ssid_len); 3656 *pos++ = WLAN_EID_SSID; 3657 *pos++ = ssid_len; 3658 if (ssid_len) 3659 memcpy(pos, ssid, ssid_len); 3660 pos += ssid_len; 3661 3662 return skb; 3663 } 3664 EXPORT_SYMBOL(ieee80211_probereq_get); 3665 3666 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3667 const void *frame, size_t frame_len, 3668 const struct ieee80211_tx_info *frame_txctl, 3669 struct ieee80211_rts *rts) 3670 { 3671 const struct ieee80211_hdr *hdr = frame; 3672 3673 rts->frame_control = 3674 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3675 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3676 frame_txctl); 3677 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3678 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3679 } 3680 EXPORT_SYMBOL(ieee80211_rts_get); 3681 3682 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3683 const void *frame, size_t frame_len, 3684 const struct ieee80211_tx_info *frame_txctl, 3685 struct ieee80211_cts *cts) 3686 { 3687 const struct ieee80211_hdr *hdr = frame; 3688 3689 cts->frame_control = 3690 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3691 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3692 frame_len, frame_txctl); 3693 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3694 } 3695 EXPORT_SYMBOL(ieee80211_ctstoself_get); 3696 3697 struct sk_buff * 3698 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 3699 struct ieee80211_vif *vif) 3700 { 3701 struct ieee80211_local *local = hw_to_local(hw); 3702 struct sk_buff *skb = NULL; 3703 struct ieee80211_tx_data tx; 3704 struct ieee80211_sub_if_data *sdata; 3705 struct ps_data *ps; 3706 struct ieee80211_tx_info *info; 3707 struct ieee80211_chanctx_conf *chanctx_conf; 3708 3709 sdata = vif_to_sdata(vif); 3710 3711 rcu_read_lock(); 3712 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3713 3714 if (!chanctx_conf) 3715 goto out; 3716 3717 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3718 struct beacon_data *beacon = 3719 rcu_dereference(sdata->u.ap.beacon); 3720 3721 if (!beacon || !beacon->head) 3722 goto out; 3723 3724 ps = &sdata->u.ap.ps; 3725 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3726 ps = &sdata->u.mesh.ps; 3727 } else { 3728 goto out; 3729 } 3730 3731 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 3732 goto out; /* send buffered bc/mc only after DTIM beacon */ 3733 3734 while (1) { 3735 skb = skb_dequeue(&ps->bc_buf); 3736 if (!skb) 3737 goto out; 3738 local->total_ps_buffered--; 3739 3740 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 3741 struct ieee80211_hdr *hdr = 3742 (struct ieee80211_hdr *) skb->data; 3743 /* more buffered multicast/broadcast frames ==> set 3744 * MoreData flag in IEEE 802.11 header to inform PS 3745 * STAs */ 3746 hdr->frame_control |= 3747 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3748 } 3749 3750 if (sdata->vif.type == NL80211_IFTYPE_AP) 3751 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3752 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 3753 break; 3754 dev_kfree_skb_any(skb); 3755 } 3756 3757 info = IEEE80211_SKB_CB(skb); 3758 3759 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3760 info->band = chanctx_conf->def.chan->band; 3761 3762 if (invoke_tx_handlers(&tx)) 3763 skb = NULL; 3764 out: 3765 rcu_read_unlock(); 3766 3767 return skb; 3768 } 3769 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3770 3771 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3772 { 3773 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3774 struct ieee80211_sub_if_data *sdata = sta->sdata; 3775 struct ieee80211_local *local = sdata->local; 3776 int ret; 3777 u32 queues; 3778 3779 lockdep_assert_held(&local->sta_mtx); 3780 3781 /* only some cases are supported right now */ 3782 switch (sdata->vif.type) { 3783 case NL80211_IFTYPE_STATION: 3784 case NL80211_IFTYPE_AP: 3785 case NL80211_IFTYPE_AP_VLAN: 3786 break; 3787 default: 3788 WARN_ON(1); 3789 return -EINVAL; 3790 } 3791 3792 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 3793 return -EINVAL; 3794 3795 if (sta->reserved_tid == tid) { 3796 ret = 0; 3797 goto out; 3798 } 3799 3800 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 3801 sdata_err(sdata, "TID reservation already active\n"); 3802 ret = -EALREADY; 3803 goto out; 3804 } 3805 3806 ieee80211_stop_vif_queues(sdata->local, sdata, 3807 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3808 3809 synchronize_net(); 3810 3811 /* Tear down BA sessions so we stop aggregating on this TID */ 3812 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 3813 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 3814 __ieee80211_stop_tx_ba_session(sta, tid, 3815 AGG_STOP_LOCAL_REQUEST); 3816 } 3817 3818 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 3819 __ieee80211_flush_queues(local, sdata, queues, false); 3820 3821 sta->reserved_tid = tid; 3822 3823 ieee80211_wake_vif_queues(local, sdata, 3824 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3825 3826 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 3827 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 3828 3829 ret = 0; 3830 out: 3831 return ret; 3832 } 3833 EXPORT_SYMBOL(ieee80211_reserve_tid); 3834 3835 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3836 { 3837 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3838 struct ieee80211_sub_if_data *sdata = sta->sdata; 3839 3840 lockdep_assert_held(&sdata->local->sta_mtx); 3841 3842 /* only some cases are supported right now */ 3843 switch (sdata->vif.type) { 3844 case NL80211_IFTYPE_STATION: 3845 case NL80211_IFTYPE_AP: 3846 case NL80211_IFTYPE_AP_VLAN: 3847 break; 3848 default: 3849 WARN_ON(1); 3850 return; 3851 } 3852 3853 if (tid != sta->reserved_tid) { 3854 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 3855 return; 3856 } 3857 3858 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 3859 } 3860 EXPORT_SYMBOL(ieee80211_unreserve_tid); 3861 3862 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3863 struct sk_buff *skb, int tid, 3864 enum ieee80211_band band) 3865 { 3866 int ac = ieee802_1d_to_ac[tid & 7]; 3867 3868 skb_set_mac_header(skb, 0); 3869 skb_set_network_header(skb, 0); 3870 skb_set_transport_header(skb, 0); 3871 3872 skb_set_queue_mapping(skb, ac); 3873 skb->priority = tid; 3874 3875 skb->dev = sdata->dev; 3876 3877 /* 3878 * The other path calling ieee80211_xmit is from the tasklet, 3879 * and while we can handle concurrent transmissions locking 3880 * requirements are that we do not come into tx with bhs on. 3881 */ 3882 local_bh_disable(); 3883 IEEE80211_SKB_CB(skb)->band = band; 3884 ieee80211_xmit(sdata, NULL, skb); 3885 local_bh_enable(); 3886 } 3887