1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <net/codel.h> 28 #include <net/codel_impl.h> 29 #include <asm/unaligned.h> 30 #include <net/fq_impl.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 44 { 45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 46 47 u64_stats_update_begin(&tstats->syncp); 48 tstats->tx_packets++; 49 tstats->tx_bytes += len; 50 u64_stats_update_end(&tstats->syncp); 51 } 52 53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 54 struct sk_buff *skb, int group_addr, 55 int next_frag_len) 56 { 57 int rate, mrate, erp, dur, i, shift = 0; 58 struct ieee80211_rate *txrate; 59 struct ieee80211_local *local = tx->local; 60 struct ieee80211_supported_band *sband; 61 struct ieee80211_hdr *hdr; 62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 63 struct ieee80211_chanctx_conf *chanctx_conf; 64 u32 rate_flags = 0; 65 66 rcu_read_lock(); 67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 68 if (chanctx_conf) { 69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 71 } 72 rcu_read_unlock(); 73 74 /* assume HW handles this */ 75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 76 return 0; 77 78 /* uh huh? */ 79 if (WARN_ON_ONCE(tx->rate.idx < 0)) 80 return 0; 81 82 sband = local->hw.wiphy->bands[info->band]; 83 txrate = &sband->bitrates[tx->rate.idx]; 84 85 erp = txrate->flags & IEEE80211_RATE_ERP_G; 86 87 /* 88 * data and mgmt (except PS Poll): 89 * - during CFP: 32768 90 * - during contention period: 91 * if addr1 is group address: 0 92 * if more fragments = 0 and addr1 is individual address: time to 93 * transmit one ACK plus SIFS 94 * if more fragments = 1 and addr1 is individual address: time to 95 * transmit next fragment plus 2 x ACK plus 3 x SIFS 96 * 97 * IEEE 802.11, 9.6: 98 * - control response frame (CTS or ACK) shall be transmitted using the 99 * same rate as the immediately previous frame in the frame exchange 100 * sequence, if this rate belongs to the PHY mandatory rates, or else 101 * at the highest possible rate belonging to the PHY rates in the 102 * BSSBasicRateSet 103 */ 104 hdr = (struct ieee80211_hdr *)skb->data; 105 if (ieee80211_is_ctl(hdr->frame_control)) { 106 /* TODO: These control frames are not currently sent by 107 * mac80211, but should they be implemented, this function 108 * needs to be updated to support duration field calculation. 109 * 110 * RTS: time needed to transmit pending data/mgmt frame plus 111 * one CTS frame plus one ACK frame plus 3 x SIFS 112 * CTS: duration of immediately previous RTS minus time 113 * required to transmit CTS and its SIFS 114 * ACK: 0 if immediately previous directed data/mgmt had 115 * more=0, with more=1 duration in ACK frame is duration 116 * from previous frame minus time needed to transmit ACK 117 * and its SIFS 118 * PS Poll: BIT(15) | BIT(14) | aid 119 */ 120 return 0; 121 } 122 123 /* data/mgmt */ 124 if (0 /* FIX: data/mgmt during CFP */) 125 return cpu_to_le16(32768); 126 127 if (group_addr) /* Group address as the destination - no ACK */ 128 return 0; 129 130 /* Individual destination address: 131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 132 * CTS and ACK frames shall be transmitted using the highest rate in 133 * basic rate set that is less than or equal to the rate of the 134 * immediately previous frame and that is using the same modulation 135 * (CCK or OFDM). If no basic rate set matches with these requirements, 136 * the highest mandatory rate of the PHY that is less than or equal to 137 * the rate of the previous frame is used. 138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 139 */ 140 rate = -1; 141 /* use lowest available if everything fails */ 142 mrate = sband->bitrates[0].bitrate; 143 for (i = 0; i < sband->n_bitrates; i++) { 144 struct ieee80211_rate *r = &sband->bitrates[i]; 145 146 if (r->bitrate > txrate->bitrate) 147 break; 148 149 if ((rate_flags & r->flags) != rate_flags) 150 continue; 151 152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 154 155 switch (sband->band) { 156 case NL80211_BAND_2GHZ: { 157 u32 flag; 158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 159 flag = IEEE80211_RATE_MANDATORY_G; 160 else 161 flag = IEEE80211_RATE_MANDATORY_B; 162 if (r->flags & flag) 163 mrate = r->bitrate; 164 break; 165 } 166 case NL80211_BAND_5GHZ: 167 if (r->flags & IEEE80211_RATE_MANDATORY_A) 168 mrate = r->bitrate; 169 break; 170 case NL80211_BAND_60GHZ: 171 /* TODO, for now fall through */ 172 case NUM_NL80211_BANDS: 173 WARN_ON(1); 174 break; 175 } 176 } 177 if (rate == -1) { 178 /* No matching basic rate found; use highest suitable mandatory 179 * PHY rate */ 180 rate = DIV_ROUND_UP(mrate, 1 << shift); 181 } 182 183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 184 if (ieee80211_is_data_qos(hdr->frame_control) && 185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 186 dur = 0; 187 else 188 /* Time needed to transmit ACK 189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 190 * to closest integer */ 191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble, 193 shift); 194 195 if (next_frag_len) { 196 /* Frame is fragmented: duration increases with time needed to 197 * transmit next fragment plus ACK and 2 x SIFS. */ 198 dur *= 2; /* ACK + SIFS */ 199 /* next fragment */ 200 dur += ieee80211_frame_duration(sband->band, next_frag_len, 201 txrate->bitrate, erp, 202 tx->sdata->vif.bss_conf.use_short_preamble, 203 shift); 204 } 205 206 return cpu_to_le16(dur); 207 } 208 209 /* tx handlers */ 210 static ieee80211_tx_result debug_noinline 211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 212 { 213 struct ieee80211_local *local = tx->local; 214 struct ieee80211_if_managed *ifmgd; 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 335 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 336 /* 337 * No associated STAs - no need to send multicast 338 * frames. 339 */ 340 return TX_DROP; 341 } 342 343 return TX_CONTINUE; 344 } 345 346 /* This function is called whenever the AP is about to exceed the maximum limit 347 * of buffered frames for power saving STAs. This situation should not really 348 * happen often during normal operation, so dropping the oldest buffered packet 349 * from each queue should be OK to make some room for new frames. */ 350 static void purge_old_ps_buffers(struct ieee80211_local *local) 351 { 352 int total = 0, purged = 0; 353 struct sk_buff *skb; 354 struct ieee80211_sub_if_data *sdata; 355 struct sta_info *sta; 356 357 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 358 struct ps_data *ps; 359 360 if (sdata->vif.type == NL80211_IFTYPE_AP) 361 ps = &sdata->u.ap.ps; 362 else if (ieee80211_vif_is_mesh(&sdata->vif)) 363 ps = &sdata->u.mesh.ps; 364 else 365 continue; 366 367 skb = skb_dequeue(&ps->bc_buf); 368 if (skb) { 369 purged++; 370 ieee80211_free_txskb(&local->hw, skb); 371 } 372 total += skb_queue_len(&ps->bc_buf); 373 } 374 375 /* 376 * Drop one frame from each station from the lowest-priority 377 * AC that has frames at all. 378 */ 379 list_for_each_entry_rcu(sta, &local->sta_list, list) { 380 int ac; 381 382 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 383 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 384 total += skb_queue_len(&sta->ps_tx_buf[ac]); 385 if (skb) { 386 purged++; 387 ieee80211_free_txskb(&local->hw, skb); 388 break; 389 } 390 } 391 } 392 393 local->total_ps_buffered = total; 394 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 395 } 396 397 static ieee80211_tx_result 398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 399 { 400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 402 struct ps_data *ps; 403 404 /* 405 * broadcast/multicast frame 406 * 407 * If any of the associated/peer stations is in power save mode, 408 * the frame is buffered to be sent after DTIM beacon frame. 409 * This is done either by the hardware or us. 410 */ 411 412 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 413 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 414 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 415 if (!tx->sdata->bss) 416 return TX_CONTINUE; 417 418 ps = &tx->sdata->bss->ps; 419 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 420 ps = &tx->sdata->u.mesh.ps; 421 } else { 422 return TX_CONTINUE; 423 } 424 425 426 /* no buffering for ordered frames */ 427 if (ieee80211_has_order(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_is_probe_req(hdr->frame_control)) 431 return TX_CONTINUE; 432 433 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 434 info->hw_queue = tx->sdata->vif.cab_queue; 435 436 /* no stations in PS mode */ 437 if (!atomic_read(&ps->num_sta_ps)) 438 return TX_CONTINUE; 439 440 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 441 442 /* device releases frame after DTIM beacon */ 443 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 444 return TX_CONTINUE; 445 446 /* buffered in mac80211 */ 447 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 448 purge_old_ps_buffers(tx->local); 449 450 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 451 ps_dbg(tx->sdata, 452 "BC TX buffer full - dropping the oldest frame\n"); 453 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 454 } else 455 tx->local->total_ps_buffered++; 456 457 skb_queue_tail(&ps->bc_buf, tx->skb); 458 459 return TX_QUEUED; 460 } 461 462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 463 struct sk_buff *skb) 464 { 465 if (!ieee80211_is_mgmt(fc)) 466 return 0; 467 468 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 469 return 0; 470 471 if (!ieee80211_is_robust_mgmt_frame(skb)) 472 return 0; 473 474 return 1; 475 } 476 477 static ieee80211_tx_result 478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 479 { 480 struct sta_info *sta = tx->sta; 481 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 483 struct ieee80211_local *local = tx->local; 484 485 if (unlikely(!sta)) 486 return TX_CONTINUE; 487 488 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 489 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 490 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 491 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 492 int ac = skb_get_queue_mapping(tx->skb); 493 494 if (ieee80211_is_mgmt(hdr->frame_control) && 495 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 496 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 497 return TX_CONTINUE; 498 } 499 500 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 501 sta->sta.addr, sta->sta.aid, ac); 502 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 503 purge_old_ps_buffers(tx->local); 504 505 /* sync with ieee80211_sta_ps_deliver_wakeup */ 506 spin_lock(&sta->ps_lock); 507 /* 508 * STA woke up the meantime and all the frames on ps_tx_buf have 509 * been queued to pending queue. No reordering can happen, go 510 * ahead and Tx the packet. 511 */ 512 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 513 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 514 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 515 spin_unlock(&sta->ps_lock); 516 return TX_CONTINUE; 517 } 518 519 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 520 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 521 ps_dbg(tx->sdata, 522 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 523 sta->sta.addr, ac); 524 ieee80211_free_txskb(&local->hw, old); 525 } else 526 tx->local->total_ps_buffered++; 527 528 info->control.jiffies = jiffies; 529 info->control.vif = &tx->sdata->vif; 530 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 531 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 532 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 533 spin_unlock(&sta->ps_lock); 534 535 if (!timer_pending(&local->sta_cleanup)) 536 mod_timer(&local->sta_cleanup, 537 round_jiffies(jiffies + 538 STA_INFO_CLEANUP_INTERVAL)); 539 540 /* 541 * We queued up some frames, so the TIM bit might 542 * need to be set, recalculate it. 543 */ 544 sta_info_recalc_tim(sta); 545 546 return TX_QUEUED; 547 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 548 ps_dbg(tx->sdata, 549 "STA %pM in PS mode, but polling/in SP -> send frame\n", 550 sta->sta.addr); 551 } 552 553 return TX_CONTINUE; 554 } 555 556 static ieee80211_tx_result debug_noinline 557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 558 { 559 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 560 return TX_CONTINUE; 561 562 if (tx->flags & IEEE80211_TX_UNICAST) 563 return ieee80211_tx_h_unicast_ps_buf(tx); 564 else 565 return ieee80211_tx_h_multicast_ps_buf(tx); 566 } 567 568 static ieee80211_tx_result debug_noinline 569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 570 { 571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 572 573 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 574 if (tx->sdata->control_port_no_encrypt) 575 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 576 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 577 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 578 } 579 580 return TX_CONTINUE; 581 } 582 583 static ieee80211_tx_result debug_noinline 584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 585 { 586 struct ieee80211_key *key; 587 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 589 590 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 591 tx->key = NULL; 592 else if (tx->sta && 593 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 594 tx->key = key; 595 else if (ieee80211_is_group_privacy_action(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_multicast_key))) 597 tx->key = key; 598 else if (ieee80211_is_mgmt(hdr->frame_control) && 599 is_multicast_ether_addr(hdr->addr1) && 600 ieee80211_is_robust_mgmt_frame(tx->skb) && 601 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 602 tx->key = key; 603 else if (is_multicast_ether_addr(hdr->addr1) && 604 (key = rcu_dereference(tx->sdata->default_multicast_key))) 605 tx->key = key; 606 else if (!is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_unicast_key))) 608 tx->key = key; 609 else 610 tx->key = NULL; 611 612 if (tx->key) { 613 bool skip_hw = false; 614 615 /* TODO: add threshold stuff again */ 616 617 switch (tx->key->conf.cipher) { 618 case WLAN_CIPHER_SUITE_WEP40: 619 case WLAN_CIPHER_SUITE_WEP104: 620 case WLAN_CIPHER_SUITE_TKIP: 621 if (!ieee80211_is_data_present(hdr->frame_control)) 622 tx->key = NULL; 623 break; 624 case WLAN_CIPHER_SUITE_CCMP: 625 case WLAN_CIPHER_SUITE_CCMP_256: 626 case WLAN_CIPHER_SUITE_GCMP: 627 case WLAN_CIPHER_SUITE_GCMP_256: 628 if (!ieee80211_is_data_present(hdr->frame_control) && 629 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 630 tx->skb) && 631 !ieee80211_is_group_privacy_action(tx->skb)) 632 tx->key = NULL; 633 else 634 skip_hw = (tx->key->conf.flags & 635 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 636 ieee80211_is_mgmt(hdr->frame_control); 637 break; 638 case WLAN_CIPHER_SUITE_AES_CMAC: 639 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 642 if (!ieee80211_is_mgmt(hdr->frame_control)) 643 tx->key = NULL; 644 break; 645 } 646 647 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 648 !ieee80211_is_deauth(hdr->frame_control))) 649 return TX_DROP; 650 651 if (!skip_hw && tx->key && 652 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 653 info->control.hw_key = &tx->key->conf; 654 } 655 656 return TX_CONTINUE; 657 } 658 659 static ieee80211_tx_result debug_noinline 660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 661 { 662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 663 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 664 struct ieee80211_supported_band *sband; 665 u32 len; 666 struct ieee80211_tx_rate_control txrc; 667 struct ieee80211_sta_rates *ratetbl = NULL; 668 bool assoc = false; 669 670 memset(&txrc, 0, sizeof(txrc)); 671 672 sband = tx->local->hw.wiphy->bands[info->band]; 673 674 len = min_t(u32, tx->skb->len + FCS_LEN, 675 tx->local->hw.wiphy->frag_threshold); 676 677 /* set up the tx rate control struct we give the RC algo */ 678 txrc.hw = &tx->local->hw; 679 txrc.sband = sband; 680 txrc.bss_conf = &tx->sdata->vif.bss_conf; 681 txrc.skb = tx->skb; 682 txrc.reported_rate.idx = -1; 683 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 684 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 685 txrc.max_rate_idx = -1; 686 else 687 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 688 689 if (tx->sdata->rc_has_mcs_mask[info->band]) 690 txrc.rate_idx_mcs_mask = 691 tx->sdata->rc_rateidx_mcs_mask[info->band]; 692 693 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 694 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 695 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 696 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 697 698 /* set up RTS protection if desired */ 699 if (len > tx->local->hw.wiphy->rts_threshold) { 700 txrc.rts = true; 701 } 702 703 info->control.use_rts = txrc.rts; 704 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 705 706 /* 707 * Use short preamble if the BSS can handle it, but not for 708 * management frames unless we know the receiver can handle 709 * that -- the management frame might be to a station that 710 * just wants a probe response. 711 */ 712 if (tx->sdata->vif.bss_conf.use_short_preamble && 713 (ieee80211_is_data(hdr->frame_control) || 714 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 715 txrc.short_preamble = true; 716 717 info->control.short_preamble = txrc.short_preamble; 718 719 /* don't ask rate control when rate already injected via radiotap */ 720 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 721 return TX_CONTINUE; 722 723 if (tx->sta) 724 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 725 726 /* 727 * Lets not bother rate control if we're associated and cannot 728 * talk to the sta. This should not happen. 729 */ 730 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 731 !rate_usable_index_exists(sband, &tx->sta->sta), 732 "%s: Dropped data frame as no usable bitrate found while " 733 "scanning and associated. Target station: " 734 "%pM on %d GHz band\n", 735 tx->sdata->name, hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline 799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 u8 *qc; 804 int tid; 805 806 /* 807 * Packet injection may want to control the sequence 808 * number, if we have no matching interface then we 809 * neither assign one ourselves nor ask the driver to. 810 */ 811 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 812 return TX_CONTINUE; 813 814 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 815 return TX_CONTINUE; 816 817 if (ieee80211_hdrlen(hdr->frame_control) < 24) 818 return TX_CONTINUE; 819 820 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 821 return TX_CONTINUE; 822 823 /* 824 * Anything but QoS data that has a sequence number field 825 * (is long enough) gets a sequence number from the global 826 * counter. QoS data frames with a multicast destination 827 * also use the global counter (802.11-2012 9.3.2.10). 828 */ 829 if (!ieee80211_is_data_qos(hdr->frame_control) || 830 is_multicast_ether_addr(hdr->addr1)) { 831 /* driver should assign sequence number */ 832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 833 /* for pure STA mode without beacons, we can do it */ 834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 835 tx->sdata->sequence_number += 0x10; 836 if (tx->sta) 837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 838 return TX_CONTINUE; 839 } 840 841 /* 842 * This should be true for injected/management frames only, for 843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 844 * above since they are not QoS-data frames. 845 */ 846 if (!tx->sta) 847 return TX_CONTINUE; 848 849 /* include per-STA, per-TID sequence counter */ 850 851 qc = ieee80211_get_qos_ctl(hdr); 852 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 853 tx->sta->tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 tx->sdata->encrypt_headroom + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + tx->sdata->encrypt_headroom); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 910 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline 921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline 996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline 1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 default: 1043 return ieee80211_crypto_hw_encrypt(tx); 1044 } 1045 1046 return TX_DROP; 1047 } 1048 1049 static ieee80211_tx_result debug_noinline 1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1051 { 1052 struct sk_buff *skb; 1053 struct ieee80211_hdr *hdr; 1054 int next_len; 1055 bool group_addr; 1056 1057 skb_queue_walk(&tx->skbs, skb) { 1058 hdr = (void *) skb->data; 1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1060 break; /* must not overwrite AID */ 1061 if (!skb_queue_is_last(&tx->skbs, skb)) { 1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1063 next_len = next->len; 1064 } else 1065 next_len = 0; 1066 group_addr = is_multicast_ether_addr(hdr->addr1); 1067 1068 hdr->duration_id = 1069 ieee80211_duration(tx, skb, group_addr, next_len); 1070 } 1071 1072 return TX_CONTINUE; 1073 } 1074 1075 /* actual transmit path */ 1076 1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1078 struct sk_buff *skb, 1079 struct ieee80211_tx_info *info, 1080 struct tid_ampdu_tx *tid_tx, 1081 int tid) 1082 { 1083 bool queued = false; 1084 bool reset_agg_timer = false; 1085 struct sk_buff *purge_skb = NULL; 1086 1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1091 /* 1092 * nothing -- this aggregation session is being started 1093 * but that might still fail with the driver 1094 */ 1095 } else if (!tx->sta->sta.txq[tid]) { 1096 spin_lock(&tx->sta->lock); 1097 /* 1098 * Need to re-check now, because we may get here 1099 * 1100 * 1) in the window during which the setup is actually 1101 * already done, but not marked yet because not all 1102 * packets are spliced over to the driver pending 1103 * queue yet -- if this happened we acquire the lock 1104 * either before or after the splice happens, but 1105 * need to recheck which of these cases happened. 1106 * 1107 * 2) during session teardown, if the OPERATIONAL bit 1108 * was cleared due to the teardown but the pointer 1109 * hasn't been assigned NULL yet (or we loaded it 1110 * before it was assigned) -- in this case it may 1111 * now be NULL which means we should just let the 1112 * packet pass through because splicing the frames 1113 * back is already done. 1114 */ 1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1116 1117 if (!tid_tx) { 1118 /* do nothing, let packet pass through */ 1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 info->flags |= IEEE80211_TX_CTL_AMPDU; 1121 reset_agg_timer = true; 1122 } else { 1123 queued = true; 1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1125 clear_sta_flag(tx->sta, WLAN_STA_SP); 1126 ps_dbg(tx->sta->sdata, 1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1128 tx->sta->sta.addr, tx->sta->sta.aid); 1129 } 1130 info->control.vif = &tx->sdata->vif; 1131 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1133 __skb_queue_tail(&tid_tx->pending, skb); 1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1135 purge_skb = __skb_dequeue(&tid_tx->pending); 1136 } 1137 spin_unlock(&tx->sta->lock); 1138 1139 if (purge_skb) 1140 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1141 } 1142 1143 /* reset session timer */ 1144 if (reset_agg_timer && tid_tx->timeout) 1145 tid_tx->last_tx = jiffies; 1146 1147 return queued; 1148 } 1149 1150 /* 1151 * initialises @tx 1152 * pass %NULL for the station if unknown, a valid pointer if known 1153 * or an ERR_PTR() if the station is known not to exist 1154 */ 1155 static ieee80211_tx_result 1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1157 struct ieee80211_tx_data *tx, 1158 struct sta_info *sta, struct sk_buff *skb) 1159 { 1160 struct ieee80211_local *local = sdata->local; 1161 struct ieee80211_hdr *hdr; 1162 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1163 int tid; 1164 u8 *qc; 1165 1166 memset(tx, 0, sizeof(*tx)); 1167 tx->skb = skb; 1168 tx->local = local; 1169 tx->sdata = sdata; 1170 __skb_queue_head_init(&tx->skbs); 1171 1172 /* 1173 * If this flag is set to true anywhere, and we get here, 1174 * we are doing the needed processing, so remove the flag 1175 * now. 1176 */ 1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1178 1179 hdr = (struct ieee80211_hdr *) skb->data; 1180 1181 if (likely(sta)) { 1182 if (!IS_ERR(sta)) 1183 tx->sta = sta; 1184 } else { 1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1186 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1187 if (!tx->sta && sdata->wdev.use_4addr) 1188 return TX_DROP; 1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1190 IEEE80211_TX_CTL_INJECTED) || 1191 tx->sdata->control_port_protocol == tx->skb->protocol) { 1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1193 } 1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1195 tx->sta = sta_info_get(sdata, hdr->addr1); 1196 } 1197 1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1202 struct tid_ampdu_tx *tid_tx; 1203 1204 qc = ieee80211_get_qos_ctl(hdr); 1205 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1206 1207 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1208 if (tid_tx) { 1209 bool queued; 1210 1211 queued = ieee80211_tx_prep_agg(tx, skb, info, 1212 tid_tx, tid); 1213 1214 if (unlikely(queued)) 1215 return TX_QUEUED; 1216 } 1217 } 1218 1219 if (is_multicast_ether_addr(hdr->addr1)) { 1220 tx->flags &= ~IEEE80211_TX_UNICAST; 1221 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1222 } else 1223 tx->flags |= IEEE80211_TX_UNICAST; 1224 1225 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1226 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1227 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1228 info->flags & IEEE80211_TX_CTL_AMPDU) 1229 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1230 } 1231 1232 if (!tx->sta) 1233 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1234 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1236 ieee80211_check_fast_xmit(tx->sta); 1237 } 1238 1239 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1240 1241 return TX_CONTINUE; 1242 } 1243 1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1245 struct ieee80211_vif *vif, 1246 struct ieee80211_sta *pubsta, 1247 struct sk_buff *skb) 1248 { 1249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1251 struct ieee80211_txq *txq = NULL; 1252 1253 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1254 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1255 return NULL; 1256 1257 if (!ieee80211_is_data(hdr->frame_control)) 1258 return NULL; 1259 1260 if (pubsta) { 1261 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1262 1263 txq = pubsta->txq[tid]; 1264 } else if (vif) { 1265 txq = vif->txq; 1266 } 1267 1268 if (!txq) 1269 return NULL; 1270 1271 return to_txq_info(txq); 1272 } 1273 1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1275 { 1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1277 } 1278 1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi) 1280 { 1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif; 1282 } 1283 1284 static u32 codel_skb_len_func(const struct sk_buff *skb) 1285 { 1286 return skb->len; 1287 } 1288 1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1290 { 1291 const struct ieee80211_tx_info *info; 1292 1293 info = (const struct ieee80211_tx_info *)skb->cb; 1294 return info->control.enqueue_time; 1295 } 1296 1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1298 void *ctx) 1299 { 1300 struct ieee80211_local *local; 1301 struct txq_info *txqi; 1302 struct fq *fq; 1303 struct fq_flow *flow; 1304 1305 txqi = ctx; 1306 local = vif_to_sdata(txqi->txq.vif)->local; 1307 fq = &local->fq; 1308 1309 if (cvars == &txqi->def_cvars) 1310 flow = &txqi->def_flow; 1311 else 1312 flow = &fq->flows[cvars - local->cvars]; 1313 1314 return fq_flow_dequeue(fq, flow); 1315 } 1316 1317 static void codel_drop_func(struct sk_buff *skb, 1318 void *ctx) 1319 { 1320 struct ieee80211_local *local; 1321 struct ieee80211_hw *hw; 1322 struct txq_info *txqi; 1323 1324 txqi = ctx; 1325 local = vif_to_sdata(txqi->txq.vif)->local; 1326 hw = &local->hw; 1327 1328 ieee80211_free_txskb(hw, skb); 1329 } 1330 1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1332 struct fq_tin *tin, 1333 struct fq_flow *flow) 1334 { 1335 struct ieee80211_local *local; 1336 struct txq_info *txqi; 1337 struct codel_vars *cvars; 1338 struct codel_params *cparams; 1339 struct codel_stats *cstats; 1340 1341 local = container_of(fq, struct ieee80211_local, fq); 1342 txqi = container_of(tin, struct txq_info, tin); 1343 cparams = &local->cparams; 1344 cstats = &txqi->cstats; 1345 1346 if (flow == &txqi->def_flow) 1347 cvars = &txqi->def_cvars; 1348 else 1349 cvars = &local->cvars[flow - fq->flows]; 1350 1351 return codel_dequeue(txqi, 1352 &flow->backlog, 1353 cparams, 1354 cvars, 1355 cstats, 1356 codel_skb_len_func, 1357 codel_skb_time_func, 1358 codel_drop_func, 1359 codel_dequeue_func); 1360 } 1361 1362 static void fq_skb_free_func(struct fq *fq, 1363 struct fq_tin *tin, 1364 struct fq_flow *flow, 1365 struct sk_buff *skb) 1366 { 1367 struct ieee80211_local *local; 1368 1369 local = container_of(fq, struct ieee80211_local, fq); 1370 ieee80211_free_txskb(&local->hw, skb); 1371 } 1372 1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1374 struct fq_tin *tin, 1375 int idx, 1376 struct sk_buff *skb) 1377 { 1378 struct txq_info *txqi; 1379 1380 txqi = container_of(tin, struct txq_info, tin); 1381 return &txqi->def_flow; 1382 } 1383 1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1385 struct txq_info *txqi, 1386 struct sk_buff *skb) 1387 { 1388 struct fq *fq = &local->fq; 1389 struct fq_tin *tin = &txqi->tin; 1390 1391 ieee80211_set_skb_enqueue_time(skb); 1392 fq_tin_enqueue(fq, tin, skb, 1393 fq_skb_free_func, 1394 fq_flow_get_default_func); 1395 } 1396 1397 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1398 struct sta_info *sta, 1399 struct txq_info *txqi, int tid) 1400 { 1401 fq_tin_init(&txqi->tin); 1402 fq_flow_init(&txqi->def_flow); 1403 codel_vars_init(&txqi->def_cvars); 1404 codel_stats_init(&txqi->cstats); 1405 __skb_queue_head_init(&txqi->frags); 1406 1407 txqi->txq.vif = &sdata->vif; 1408 1409 if (sta) { 1410 txqi->txq.sta = &sta->sta; 1411 sta->sta.txq[tid] = &txqi->txq; 1412 txqi->txq.tid = tid; 1413 txqi->txq.ac = ieee802_1d_to_ac[tid & 7]; 1414 } else { 1415 sdata->vif.txq = &txqi->txq; 1416 txqi->txq.tid = 0; 1417 txqi->txq.ac = IEEE80211_AC_BE; 1418 } 1419 } 1420 1421 void ieee80211_txq_purge(struct ieee80211_local *local, 1422 struct txq_info *txqi) 1423 { 1424 struct fq *fq = &local->fq; 1425 struct fq_tin *tin = &txqi->tin; 1426 1427 fq_tin_reset(fq, tin, fq_skb_free_func); 1428 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1429 } 1430 1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1432 { 1433 struct fq *fq = &local->fq; 1434 int ret; 1435 int i; 1436 bool supp_vht = false; 1437 enum nl80211_band band; 1438 1439 if (!local->ops->wake_tx_queue) 1440 return 0; 1441 1442 ret = fq_init(fq, 4096); 1443 if (ret) 1444 return ret; 1445 1446 /* 1447 * If the hardware doesn't support VHT, it is safe to limit the maximum 1448 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1449 */ 1450 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1451 struct ieee80211_supported_band *sband; 1452 1453 sband = local->hw.wiphy->bands[band]; 1454 if (!sband) 1455 continue; 1456 1457 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1458 } 1459 1460 if (!supp_vht) 1461 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1462 1463 codel_params_init(&local->cparams); 1464 local->cparams.interval = MS2TIME(100); 1465 local->cparams.target = MS2TIME(20); 1466 local->cparams.ecn = true; 1467 1468 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1469 GFP_KERNEL); 1470 if (!local->cvars) { 1471 spin_lock_bh(&fq->lock); 1472 fq_reset(fq, fq_skb_free_func); 1473 spin_unlock_bh(&fq->lock); 1474 return -ENOMEM; 1475 } 1476 1477 for (i = 0; i < fq->flows_cnt; i++) 1478 codel_vars_init(&local->cvars[i]); 1479 1480 return 0; 1481 } 1482 1483 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1484 { 1485 struct fq *fq = &local->fq; 1486 1487 if (!local->ops->wake_tx_queue) 1488 return; 1489 1490 kfree(local->cvars); 1491 local->cvars = NULL; 1492 1493 spin_lock_bh(&fq->lock); 1494 fq_reset(fq, fq_skb_free_func); 1495 spin_unlock_bh(&fq->lock); 1496 } 1497 1498 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1499 struct ieee80211_sub_if_data *sdata, 1500 struct sta_info *sta, 1501 struct sk_buff *skb) 1502 { 1503 struct fq *fq = &local->fq; 1504 struct ieee80211_vif *vif; 1505 struct txq_info *txqi; 1506 struct ieee80211_sta *pubsta; 1507 1508 if (!local->ops->wake_tx_queue || 1509 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1510 return false; 1511 1512 if (sta && sta->uploaded) 1513 pubsta = &sta->sta; 1514 else 1515 pubsta = NULL; 1516 1517 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1518 sdata = container_of(sdata->bss, 1519 struct ieee80211_sub_if_data, u.ap); 1520 1521 vif = &sdata->vif; 1522 txqi = ieee80211_get_txq(local, vif, pubsta, skb); 1523 1524 if (!txqi) 1525 return false; 1526 1527 spin_lock_bh(&fq->lock); 1528 ieee80211_txq_enqueue(local, txqi, skb); 1529 spin_unlock_bh(&fq->lock); 1530 1531 drv_wake_tx_queue(local, txqi); 1532 1533 return true; 1534 } 1535 1536 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1537 struct ieee80211_vif *vif, 1538 struct ieee80211_sta *sta, 1539 struct sk_buff_head *skbs, 1540 bool txpending) 1541 { 1542 struct ieee80211_tx_control control = {}; 1543 struct sk_buff *skb, *tmp; 1544 unsigned long flags; 1545 1546 skb_queue_walk_safe(skbs, skb, tmp) { 1547 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1548 int q = info->hw_queue; 1549 1550 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1551 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1552 __skb_unlink(skb, skbs); 1553 ieee80211_free_txskb(&local->hw, skb); 1554 continue; 1555 } 1556 #endif 1557 1558 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1559 if (local->queue_stop_reasons[q] || 1560 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1561 if (unlikely(info->flags & 1562 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1563 if (local->queue_stop_reasons[q] & 1564 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1565 /* 1566 * Drop off-channel frames if queues 1567 * are stopped for any reason other 1568 * than off-channel operation. Never 1569 * queue them. 1570 */ 1571 spin_unlock_irqrestore( 1572 &local->queue_stop_reason_lock, 1573 flags); 1574 ieee80211_purge_tx_queue(&local->hw, 1575 skbs); 1576 return true; 1577 } 1578 } else { 1579 1580 /* 1581 * Since queue is stopped, queue up frames for 1582 * later transmission from the tx-pending 1583 * tasklet when the queue is woken again. 1584 */ 1585 if (txpending) 1586 skb_queue_splice_init(skbs, 1587 &local->pending[q]); 1588 else 1589 skb_queue_splice_tail_init(skbs, 1590 &local->pending[q]); 1591 1592 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1593 flags); 1594 return false; 1595 } 1596 } 1597 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1598 1599 info->control.vif = vif; 1600 control.sta = sta; 1601 1602 __skb_unlink(skb, skbs); 1603 drv_tx(local, &control, skb); 1604 } 1605 1606 return true; 1607 } 1608 1609 /* 1610 * Returns false if the frame couldn't be transmitted but was queued instead. 1611 */ 1612 static bool __ieee80211_tx(struct ieee80211_local *local, 1613 struct sk_buff_head *skbs, int led_len, 1614 struct sta_info *sta, bool txpending) 1615 { 1616 struct ieee80211_tx_info *info; 1617 struct ieee80211_sub_if_data *sdata; 1618 struct ieee80211_vif *vif; 1619 struct ieee80211_sta *pubsta; 1620 struct sk_buff *skb; 1621 bool result = true; 1622 __le16 fc; 1623 1624 if (WARN_ON(skb_queue_empty(skbs))) 1625 return true; 1626 1627 skb = skb_peek(skbs); 1628 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1629 info = IEEE80211_SKB_CB(skb); 1630 sdata = vif_to_sdata(info->control.vif); 1631 if (sta && !sta->uploaded) 1632 sta = NULL; 1633 1634 if (sta) 1635 pubsta = &sta->sta; 1636 else 1637 pubsta = NULL; 1638 1639 switch (sdata->vif.type) { 1640 case NL80211_IFTYPE_MONITOR: 1641 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1642 vif = &sdata->vif; 1643 break; 1644 } 1645 sdata = rcu_dereference(local->monitor_sdata); 1646 if (sdata) { 1647 vif = &sdata->vif; 1648 info->hw_queue = 1649 vif->hw_queue[skb_get_queue_mapping(skb)]; 1650 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1651 ieee80211_purge_tx_queue(&local->hw, skbs); 1652 return true; 1653 } else 1654 vif = NULL; 1655 break; 1656 case NL80211_IFTYPE_AP_VLAN: 1657 sdata = container_of(sdata->bss, 1658 struct ieee80211_sub_if_data, u.ap); 1659 /* fall through */ 1660 default: 1661 vif = &sdata->vif; 1662 break; 1663 } 1664 1665 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1666 txpending); 1667 1668 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1669 1670 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1671 1672 return result; 1673 } 1674 1675 /* 1676 * Invoke TX handlers, return 0 on success and non-zero if the 1677 * frame was dropped or queued. 1678 * 1679 * The handlers are split into an early and late part. The latter is everything 1680 * that can be sensitive to reordering, and will be deferred to after packets 1681 * are dequeued from the intermediate queues (when they are enabled). 1682 */ 1683 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1684 { 1685 ieee80211_tx_result res = TX_DROP; 1686 1687 #define CALL_TXH(txh) \ 1688 do { \ 1689 res = txh(tx); \ 1690 if (res != TX_CONTINUE) \ 1691 goto txh_done; \ 1692 } while (0) 1693 1694 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1695 CALL_TXH(ieee80211_tx_h_check_assoc); 1696 CALL_TXH(ieee80211_tx_h_ps_buf); 1697 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1698 CALL_TXH(ieee80211_tx_h_select_key); 1699 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1700 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1701 1702 txh_done: 1703 if (unlikely(res == TX_DROP)) { 1704 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1705 if (tx->skb) 1706 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1707 else 1708 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1709 return -1; 1710 } else if (unlikely(res == TX_QUEUED)) { 1711 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1712 return -1; 1713 } 1714 1715 return 0; 1716 } 1717 1718 /* 1719 * Late handlers can be called while the sta lock is held. Handlers that can 1720 * cause packets to be generated will cause deadlock! 1721 */ 1722 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1723 { 1724 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1725 ieee80211_tx_result res = TX_CONTINUE; 1726 1727 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1728 __skb_queue_tail(&tx->skbs, tx->skb); 1729 tx->skb = NULL; 1730 goto txh_done; 1731 } 1732 1733 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1734 CALL_TXH(ieee80211_tx_h_sequence); 1735 CALL_TXH(ieee80211_tx_h_fragment); 1736 /* handlers after fragment must be aware of tx info fragmentation! */ 1737 CALL_TXH(ieee80211_tx_h_stats); 1738 CALL_TXH(ieee80211_tx_h_encrypt); 1739 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1740 CALL_TXH(ieee80211_tx_h_calculate_duration); 1741 #undef CALL_TXH 1742 1743 txh_done: 1744 if (unlikely(res == TX_DROP)) { 1745 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1746 if (tx->skb) 1747 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1748 else 1749 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1750 return -1; 1751 } else if (unlikely(res == TX_QUEUED)) { 1752 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1753 return -1; 1754 } 1755 1756 return 0; 1757 } 1758 1759 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1760 { 1761 int r = invoke_tx_handlers_early(tx); 1762 1763 if (r) 1764 return r; 1765 return invoke_tx_handlers_late(tx); 1766 } 1767 1768 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1769 struct ieee80211_vif *vif, struct sk_buff *skb, 1770 int band, struct ieee80211_sta **sta) 1771 { 1772 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1773 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1774 struct ieee80211_tx_data tx; 1775 struct sk_buff *skb2; 1776 1777 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1778 return false; 1779 1780 info->band = band; 1781 info->control.vif = vif; 1782 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1783 1784 if (invoke_tx_handlers(&tx)) 1785 return false; 1786 1787 if (sta) { 1788 if (tx.sta) 1789 *sta = &tx.sta->sta; 1790 else 1791 *sta = NULL; 1792 } 1793 1794 /* this function isn't suitable for fragmented data frames */ 1795 skb2 = __skb_dequeue(&tx.skbs); 1796 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1797 ieee80211_free_txskb(hw, skb2); 1798 ieee80211_purge_tx_queue(hw, &tx.skbs); 1799 return false; 1800 } 1801 1802 return true; 1803 } 1804 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1805 1806 /* 1807 * Returns false if the frame couldn't be transmitted but was queued instead. 1808 */ 1809 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1810 struct sta_info *sta, struct sk_buff *skb, 1811 bool txpending) 1812 { 1813 struct ieee80211_local *local = sdata->local; 1814 struct ieee80211_tx_data tx; 1815 ieee80211_tx_result res_prepare; 1816 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1817 bool result = true; 1818 int led_len; 1819 1820 if (unlikely(skb->len < 10)) { 1821 dev_kfree_skb(skb); 1822 return true; 1823 } 1824 1825 /* initialises tx */ 1826 led_len = skb->len; 1827 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1828 1829 if (unlikely(res_prepare == TX_DROP)) { 1830 ieee80211_free_txskb(&local->hw, skb); 1831 return true; 1832 } else if (unlikely(res_prepare == TX_QUEUED)) { 1833 return true; 1834 } 1835 1836 /* set up hw_queue value early */ 1837 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1838 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1839 info->hw_queue = 1840 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1841 1842 if (invoke_tx_handlers_early(&tx)) 1843 return false; 1844 1845 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1846 return true; 1847 1848 if (!invoke_tx_handlers_late(&tx)) 1849 result = __ieee80211_tx(local, &tx.skbs, led_len, 1850 tx.sta, txpending); 1851 1852 return result; 1853 } 1854 1855 /* device xmit handlers */ 1856 1857 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1858 struct sk_buff *skb, 1859 int head_need, bool may_encrypt) 1860 { 1861 struct ieee80211_local *local = sdata->local; 1862 int tail_need = 0; 1863 1864 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1865 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1866 tail_need -= skb_tailroom(skb); 1867 tail_need = max_t(int, tail_need, 0); 1868 } 1869 1870 if (skb_cloned(skb) && 1871 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1872 !skb_clone_writable(skb, ETH_HLEN) || 1873 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1874 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1875 else if (head_need || tail_need) 1876 I802_DEBUG_INC(local->tx_expand_skb_head); 1877 else 1878 return 0; 1879 1880 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1881 wiphy_debug(local->hw.wiphy, 1882 "failed to reallocate TX buffer\n"); 1883 return -ENOMEM; 1884 } 1885 1886 return 0; 1887 } 1888 1889 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1890 struct sta_info *sta, struct sk_buff *skb) 1891 { 1892 struct ieee80211_local *local = sdata->local; 1893 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1894 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1895 int headroom; 1896 bool may_encrypt; 1897 1898 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1899 1900 headroom = local->tx_headroom; 1901 if (may_encrypt) 1902 headroom += sdata->encrypt_headroom; 1903 headroom -= skb_headroom(skb); 1904 headroom = max_t(int, 0, headroom); 1905 1906 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1907 ieee80211_free_txskb(&local->hw, skb); 1908 return; 1909 } 1910 1911 hdr = (struct ieee80211_hdr *) skb->data; 1912 info->control.vif = &sdata->vif; 1913 1914 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1915 if (ieee80211_is_data(hdr->frame_control) && 1916 is_unicast_ether_addr(hdr->addr1)) { 1917 if (mesh_nexthop_resolve(sdata, skb)) 1918 return; /* skb queued: don't free */ 1919 } else { 1920 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1921 } 1922 } 1923 1924 ieee80211_set_qos_hdr(sdata, skb); 1925 ieee80211_tx(sdata, sta, skb, false); 1926 } 1927 1928 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1929 struct sk_buff *skb) 1930 { 1931 struct ieee80211_radiotap_iterator iterator; 1932 struct ieee80211_radiotap_header *rthdr = 1933 (struct ieee80211_radiotap_header *) skb->data; 1934 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1935 struct ieee80211_supported_band *sband = 1936 local->hw.wiphy->bands[info->band]; 1937 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1938 NULL); 1939 u16 txflags; 1940 u16 rate = 0; 1941 bool rate_found = false; 1942 u8 rate_retries = 0; 1943 u16 rate_flags = 0; 1944 u8 mcs_known, mcs_flags, mcs_bw; 1945 u16 vht_known; 1946 u8 vht_mcs = 0, vht_nss = 0; 1947 int i; 1948 1949 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1950 IEEE80211_TX_CTL_DONTFRAG; 1951 1952 /* 1953 * for every radiotap entry that is present 1954 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1955 * entries present, or -EINVAL on error) 1956 */ 1957 1958 while (!ret) { 1959 ret = ieee80211_radiotap_iterator_next(&iterator); 1960 1961 if (ret) 1962 continue; 1963 1964 /* see if this argument is something we can use */ 1965 switch (iterator.this_arg_index) { 1966 /* 1967 * You must take care when dereferencing iterator.this_arg 1968 * for multibyte types... the pointer is not aligned. Use 1969 * get_unaligned((type *)iterator.this_arg) to dereference 1970 * iterator.this_arg for type "type" safely on all arches. 1971 */ 1972 case IEEE80211_RADIOTAP_FLAGS: 1973 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1974 /* 1975 * this indicates that the skb we have been 1976 * handed has the 32-bit FCS CRC at the end... 1977 * we should react to that by snipping it off 1978 * because it will be recomputed and added 1979 * on transmission 1980 */ 1981 if (skb->len < (iterator._max_length + FCS_LEN)) 1982 return false; 1983 1984 skb_trim(skb, skb->len - FCS_LEN); 1985 } 1986 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1987 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1988 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1989 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1990 break; 1991 1992 case IEEE80211_RADIOTAP_TX_FLAGS: 1993 txflags = get_unaligned_le16(iterator.this_arg); 1994 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1995 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1996 break; 1997 1998 case IEEE80211_RADIOTAP_RATE: 1999 rate = *iterator.this_arg; 2000 rate_flags = 0; 2001 rate_found = true; 2002 break; 2003 2004 case IEEE80211_RADIOTAP_DATA_RETRIES: 2005 rate_retries = *iterator.this_arg; 2006 break; 2007 2008 case IEEE80211_RADIOTAP_MCS: 2009 mcs_known = iterator.this_arg[0]; 2010 mcs_flags = iterator.this_arg[1]; 2011 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2012 break; 2013 2014 rate_found = true; 2015 rate = iterator.this_arg[2]; 2016 rate_flags = IEEE80211_TX_RC_MCS; 2017 2018 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2019 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2020 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2021 2022 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2023 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2024 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2025 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2026 break; 2027 2028 case IEEE80211_RADIOTAP_VHT: 2029 vht_known = get_unaligned_le16(iterator.this_arg); 2030 rate_found = true; 2031 2032 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2033 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2034 (iterator.this_arg[2] & 2035 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2036 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2037 if (vht_known & 2038 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2039 if (iterator.this_arg[3] == 1) 2040 rate_flags |= 2041 IEEE80211_TX_RC_40_MHZ_WIDTH; 2042 else if (iterator.this_arg[3] == 4) 2043 rate_flags |= 2044 IEEE80211_TX_RC_80_MHZ_WIDTH; 2045 else if (iterator.this_arg[3] == 11) 2046 rate_flags |= 2047 IEEE80211_TX_RC_160_MHZ_WIDTH; 2048 } 2049 2050 vht_mcs = iterator.this_arg[4] >> 4; 2051 vht_nss = iterator.this_arg[4] & 0xF; 2052 break; 2053 2054 /* 2055 * Please update the file 2056 * Documentation/networking/mac80211-injection.txt 2057 * when parsing new fields here. 2058 */ 2059 2060 default: 2061 break; 2062 } 2063 } 2064 2065 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2066 return false; 2067 2068 if (rate_found) { 2069 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2070 2071 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2072 info->control.rates[i].idx = -1; 2073 info->control.rates[i].flags = 0; 2074 info->control.rates[i].count = 0; 2075 } 2076 2077 if (rate_flags & IEEE80211_TX_RC_MCS) { 2078 info->control.rates[0].idx = rate; 2079 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2080 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2081 vht_nss); 2082 } else { 2083 for (i = 0; i < sband->n_bitrates; i++) { 2084 if (rate * 5 != sband->bitrates[i].bitrate) 2085 continue; 2086 2087 info->control.rates[0].idx = i; 2088 break; 2089 } 2090 } 2091 2092 if (info->control.rates[0].idx < 0) 2093 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2094 2095 info->control.rates[0].flags = rate_flags; 2096 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2097 local->hw.max_rate_tries); 2098 } 2099 2100 /* 2101 * remove the radiotap header 2102 * iterator->_max_length was sanity-checked against 2103 * skb->len by iterator init 2104 */ 2105 skb_pull(skb, iterator._max_length); 2106 2107 return true; 2108 } 2109 2110 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2111 struct net_device *dev) 2112 { 2113 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2114 struct ieee80211_chanctx_conf *chanctx_conf; 2115 struct ieee80211_radiotap_header *prthdr = 2116 (struct ieee80211_radiotap_header *)skb->data; 2117 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2118 struct ieee80211_hdr *hdr; 2119 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2120 struct cfg80211_chan_def *chandef; 2121 u16 len_rthdr; 2122 int hdrlen; 2123 2124 /* check for not even having the fixed radiotap header part */ 2125 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2126 goto fail; /* too short to be possibly valid */ 2127 2128 /* is it a header version we can trust to find length from? */ 2129 if (unlikely(prthdr->it_version)) 2130 goto fail; /* only version 0 is supported */ 2131 2132 /* then there must be a radiotap header with a length we can use */ 2133 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2134 2135 /* does the skb contain enough to deliver on the alleged length? */ 2136 if (unlikely(skb->len < len_rthdr)) 2137 goto fail; /* skb too short for claimed rt header extent */ 2138 2139 /* 2140 * fix up the pointers accounting for the radiotap 2141 * header still being in there. We are being given 2142 * a precooked IEEE80211 header so no need for 2143 * normal processing 2144 */ 2145 skb_set_mac_header(skb, len_rthdr); 2146 /* 2147 * these are just fixed to the end of the rt area since we 2148 * don't have any better information and at this point, nobody cares 2149 */ 2150 skb_set_network_header(skb, len_rthdr); 2151 skb_set_transport_header(skb, len_rthdr); 2152 2153 if (skb->len < len_rthdr + 2) 2154 goto fail; 2155 2156 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2157 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2158 2159 if (skb->len < len_rthdr + hdrlen) 2160 goto fail; 2161 2162 /* 2163 * Initialize skb->protocol if the injected frame is a data frame 2164 * carrying a rfc1042 header 2165 */ 2166 if (ieee80211_is_data(hdr->frame_control) && 2167 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2168 u8 *payload = (u8 *)hdr + hdrlen; 2169 2170 if (ether_addr_equal(payload, rfc1042_header)) 2171 skb->protocol = cpu_to_be16((payload[6] << 8) | 2172 payload[7]); 2173 } 2174 2175 memset(info, 0, sizeof(*info)); 2176 2177 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2178 IEEE80211_TX_CTL_INJECTED; 2179 2180 rcu_read_lock(); 2181 2182 /* 2183 * We process outgoing injected frames that have a local address 2184 * we handle as though they are non-injected frames. 2185 * This code here isn't entirely correct, the local MAC address 2186 * isn't always enough to find the interface to use; for proper 2187 * VLAN/WDS support we will need a different mechanism (which 2188 * likely isn't going to be monitor interfaces). 2189 */ 2190 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2191 2192 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2193 if (!ieee80211_sdata_running(tmp_sdata)) 2194 continue; 2195 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2196 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2197 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2198 continue; 2199 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2200 sdata = tmp_sdata; 2201 break; 2202 } 2203 } 2204 2205 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2206 if (!chanctx_conf) { 2207 tmp_sdata = rcu_dereference(local->monitor_sdata); 2208 if (tmp_sdata) 2209 chanctx_conf = 2210 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2211 } 2212 2213 if (chanctx_conf) 2214 chandef = &chanctx_conf->def; 2215 else if (!local->use_chanctx) 2216 chandef = &local->_oper_chandef; 2217 else 2218 goto fail_rcu; 2219 2220 /* 2221 * Frame injection is not allowed if beaconing is not allowed 2222 * or if we need radar detection. Beaconing is usually not allowed when 2223 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2224 * Passive scan is also used in world regulatory domains where 2225 * your country is not known and as such it should be treated as 2226 * NO TX unless the channel is explicitly allowed in which case 2227 * your current regulatory domain would not have the passive scan 2228 * flag. 2229 * 2230 * Since AP mode uses monitor interfaces to inject/TX management 2231 * frames we can make AP mode the exception to this rule once it 2232 * supports radar detection as its implementation can deal with 2233 * radar detection by itself. We can do that later by adding a 2234 * monitor flag interfaces used for AP support. 2235 */ 2236 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2237 sdata->vif.type)) 2238 goto fail_rcu; 2239 2240 info->band = chandef->chan->band; 2241 2242 /* process and remove the injection radiotap header */ 2243 if (!ieee80211_parse_tx_radiotap(local, skb)) 2244 goto fail_rcu; 2245 2246 ieee80211_xmit(sdata, NULL, skb); 2247 rcu_read_unlock(); 2248 2249 return NETDEV_TX_OK; 2250 2251 fail_rcu: 2252 rcu_read_unlock(); 2253 fail: 2254 dev_kfree_skb(skb); 2255 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2256 } 2257 2258 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2259 { 2260 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2261 2262 return ethertype == ETH_P_TDLS && 2263 skb->len > 14 && 2264 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2265 } 2266 2267 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2268 struct sk_buff *skb, 2269 struct sta_info **sta_out) 2270 { 2271 struct sta_info *sta; 2272 2273 switch (sdata->vif.type) { 2274 case NL80211_IFTYPE_AP_VLAN: 2275 sta = rcu_dereference(sdata->u.vlan.sta); 2276 if (sta) { 2277 *sta_out = sta; 2278 return 0; 2279 } else if (sdata->wdev.use_4addr) { 2280 return -ENOLINK; 2281 } 2282 /* fall through */ 2283 case NL80211_IFTYPE_AP: 2284 case NL80211_IFTYPE_OCB: 2285 case NL80211_IFTYPE_ADHOC: 2286 if (is_multicast_ether_addr(skb->data)) { 2287 *sta_out = ERR_PTR(-ENOENT); 2288 return 0; 2289 } 2290 sta = sta_info_get_bss(sdata, skb->data); 2291 break; 2292 case NL80211_IFTYPE_WDS: 2293 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2294 break; 2295 #ifdef CONFIG_MAC80211_MESH 2296 case NL80211_IFTYPE_MESH_POINT: 2297 /* determined much later */ 2298 *sta_out = NULL; 2299 return 0; 2300 #endif 2301 case NL80211_IFTYPE_STATION: 2302 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2303 sta = sta_info_get(sdata, skb->data); 2304 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2305 if (test_sta_flag(sta, 2306 WLAN_STA_TDLS_PEER_AUTH)) { 2307 *sta_out = sta; 2308 return 0; 2309 } 2310 2311 /* 2312 * TDLS link during setup - throw out frames to 2313 * peer. Allow TDLS-setup frames to unauthorized 2314 * peers for the special case of a link teardown 2315 * after a TDLS sta is removed due to being 2316 * unreachable. 2317 */ 2318 if (!ieee80211_is_tdls_setup(skb)) 2319 return -EINVAL; 2320 } 2321 2322 } 2323 2324 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2325 if (!sta) 2326 return -ENOLINK; 2327 break; 2328 default: 2329 return -EINVAL; 2330 } 2331 2332 *sta_out = sta ?: ERR_PTR(-ENOENT); 2333 return 0; 2334 } 2335 2336 /** 2337 * ieee80211_build_hdr - build 802.11 header in the given frame 2338 * @sdata: virtual interface to build the header for 2339 * @skb: the skb to build the header in 2340 * @info_flags: skb flags to set 2341 * 2342 * This function takes the skb with 802.3 header and reformats the header to 2343 * the appropriate IEEE 802.11 header based on which interface the packet is 2344 * being transmitted on. 2345 * 2346 * Note that this function also takes care of the TX status request and 2347 * potential unsharing of the SKB - this needs to be interleaved with the 2348 * header building. 2349 * 2350 * The function requires the read-side RCU lock held 2351 * 2352 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2353 */ 2354 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2355 struct sk_buff *skb, u32 info_flags, 2356 struct sta_info *sta) 2357 { 2358 struct ieee80211_local *local = sdata->local; 2359 struct ieee80211_tx_info *info; 2360 int head_need; 2361 u16 ethertype, hdrlen, meshhdrlen = 0; 2362 __le16 fc; 2363 struct ieee80211_hdr hdr; 2364 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2365 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2366 const u8 *encaps_data; 2367 int encaps_len, skip_header_bytes; 2368 bool wme_sta = false, authorized = false; 2369 bool tdls_peer; 2370 bool multicast; 2371 u16 info_id = 0; 2372 struct ieee80211_chanctx_conf *chanctx_conf; 2373 struct ieee80211_sub_if_data *ap_sdata; 2374 enum nl80211_band band; 2375 int ret; 2376 2377 if (IS_ERR(sta)) 2378 sta = NULL; 2379 2380 /* convert Ethernet header to proper 802.11 header (based on 2381 * operation mode) */ 2382 ethertype = (skb->data[12] << 8) | skb->data[13]; 2383 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2384 2385 switch (sdata->vif.type) { 2386 case NL80211_IFTYPE_AP_VLAN: 2387 if (sdata->wdev.use_4addr) { 2388 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2389 /* RA TA DA SA */ 2390 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2391 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2392 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2393 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2394 hdrlen = 30; 2395 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2396 wme_sta = sta->sta.wme; 2397 } 2398 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2399 u.ap); 2400 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2401 if (!chanctx_conf) { 2402 ret = -ENOTCONN; 2403 goto free; 2404 } 2405 band = chanctx_conf->def.chan->band; 2406 if (sdata->wdev.use_4addr) 2407 break; 2408 /* fall through */ 2409 case NL80211_IFTYPE_AP: 2410 if (sdata->vif.type == NL80211_IFTYPE_AP) 2411 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2412 if (!chanctx_conf) { 2413 ret = -ENOTCONN; 2414 goto free; 2415 } 2416 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2417 /* DA BSSID SA */ 2418 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2419 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2420 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2421 hdrlen = 24; 2422 band = chanctx_conf->def.chan->band; 2423 break; 2424 case NL80211_IFTYPE_WDS: 2425 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2426 /* RA TA DA SA */ 2427 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2428 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2429 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2430 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2431 hdrlen = 30; 2432 /* 2433 * This is the exception! WDS style interfaces are prohibited 2434 * when channel contexts are in used so this must be valid 2435 */ 2436 band = local->hw.conf.chandef.chan->band; 2437 break; 2438 #ifdef CONFIG_MAC80211_MESH 2439 case NL80211_IFTYPE_MESH_POINT: 2440 if (!is_multicast_ether_addr(skb->data)) { 2441 struct sta_info *next_hop; 2442 bool mpp_lookup = true; 2443 2444 mpath = mesh_path_lookup(sdata, skb->data); 2445 if (mpath) { 2446 mpp_lookup = false; 2447 next_hop = rcu_dereference(mpath->next_hop); 2448 if (!next_hop || 2449 !(mpath->flags & (MESH_PATH_ACTIVE | 2450 MESH_PATH_RESOLVING))) 2451 mpp_lookup = true; 2452 } 2453 2454 if (mpp_lookup) { 2455 mppath = mpp_path_lookup(sdata, skb->data); 2456 if (mppath) 2457 mppath->exp_time = jiffies; 2458 } 2459 2460 if (mppath && mpath) 2461 mesh_path_del(sdata, mpath->dst); 2462 } 2463 2464 /* 2465 * Use address extension if it is a packet from 2466 * another interface or if we know the destination 2467 * is being proxied by a portal (i.e. portal address 2468 * differs from proxied address) 2469 */ 2470 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2471 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2472 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2473 skb->data, skb->data + ETH_ALEN); 2474 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2475 NULL, NULL); 2476 } else { 2477 /* DS -> MBSS (802.11-2012 13.11.3.3). 2478 * For unicast with unknown forwarding information, 2479 * destination might be in the MBSS or if that fails 2480 * forwarded to another mesh gate. In either case 2481 * resolution will be handled in ieee80211_xmit(), so 2482 * leave the original DA. This also works for mcast */ 2483 const u8 *mesh_da = skb->data; 2484 2485 if (mppath) 2486 mesh_da = mppath->mpp; 2487 else if (mpath) 2488 mesh_da = mpath->dst; 2489 2490 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2491 mesh_da, sdata->vif.addr); 2492 if (is_multicast_ether_addr(mesh_da)) 2493 /* DA TA mSA AE:SA */ 2494 meshhdrlen = ieee80211_new_mesh_header( 2495 sdata, &mesh_hdr, 2496 skb->data + ETH_ALEN, NULL); 2497 else 2498 /* RA TA mDA mSA AE:DA SA */ 2499 meshhdrlen = ieee80211_new_mesh_header( 2500 sdata, &mesh_hdr, skb->data, 2501 skb->data + ETH_ALEN); 2502 2503 } 2504 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2505 if (!chanctx_conf) { 2506 ret = -ENOTCONN; 2507 goto free; 2508 } 2509 band = chanctx_conf->def.chan->band; 2510 break; 2511 #endif 2512 case NL80211_IFTYPE_STATION: 2513 /* we already did checks when looking up the RA STA */ 2514 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2515 2516 if (tdls_peer) { 2517 /* DA SA BSSID */ 2518 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2519 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2520 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2521 hdrlen = 24; 2522 } else if (sdata->u.mgd.use_4addr && 2523 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2524 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2525 IEEE80211_FCTL_TODS); 2526 /* RA TA DA SA */ 2527 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2528 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2529 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2530 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2531 hdrlen = 30; 2532 } else { 2533 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2534 /* BSSID SA DA */ 2535 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2536 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2537 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2538 hdrlen = 24; 2539 } 2540 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2541 if (!chanctx_conf) { 2542 ret = -ENOTCONN; 2543 goto free; 2544 } 2545 band = chanctx_conf->def.chan->band; 2546 break; 2547 case NL80211_IFTYPE_OCB: 2548 /* DA SA BSSID */ 2549 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2550 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2551 eth_broadcast_addr(hdr.addr3); 2552 hdrlen = 24; 2553 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2554 if (!chanctx_conf) { 2555 ret = -ENOTCONN; 2556 goto free; 2557 } 2558 band = chanctx_conf->def.chan->band; 2559 break; 2560 case NL80211_IFTYPE_ADHOC: 2561 /* DA SA BSSID */ 2562 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2563 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2564 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2565 hdrlen = 24; 2566 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2567 if (!chanctx_conf) { 2568 ret = -ENOTCONN; 2569 goto free; 2570 } 2571 band = chanctx_conf->def.chan->band; 2572 break; 2573 default: 2574 ret = -EINVAL; 2575 goto free; 2576 } 2577 2578 multicast = is_multicast_ether_addr(hdr.addr1); 2579 2580 /* sta is always NULL for mesh */ 2581 if (sta) { 2582 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2583 wme_sta = sta->sta.wme; 2584 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2585 /* For mesh, the use of the QoS header is mandatory */ 2586 wme_sta = true; 2587 } 2588 2589 /* receiver does QoS (which also means we do) use it */ 2590 if (wme_sta) { 2591 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2592 hdrlen += 2; 2593 } 2594 2595 /* 2596 * Drop unicast frames to unauthorised stations unless they are 2597 * EAPOL frames from the local station. 2598 */ 2599 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2600 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2601 !multicast && !authorized && 2602 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2603 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2604 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2605 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2606 sdata->name, hdr.addr1); 2607 #endif 2608 2609 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2610 2611 ret = -EPERM; 2612 goto free; 2613 } 2614 2615 if (unlikely(!multicast && skb->sk && 2616 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2617 struct sk_buff *ack_skb = skb_clone_sk(skb); 2618 2619 if (ack_skb) { 2620 unsigned long flags; 2621 int id; 2622 2623 spin_lock_irqsave(&local->ack_status_lock, flags); 2624 id = idr_alloc(&local->ack_status_frames, ack_skb, 2625 1, 0x10000, GFP_ATOMIC); 2626 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2627 2628 if (id >= 0) { 2629 info_id = id; 2630 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2631 } else { 2632 kfree_skb(ack_skb); 2633 } 2634 } 2635 } 2636 2637 /* 2638 * If the skb is shared we need to obtain our own copy. 2639 */ 2640 if (skb_shared(skb)) { 2641 struct sk_buff *tmp_skb = skb; 2642 2643 /* can't happen -- skb is a clone if info_id != 0 */ 2644 WARN_ON(info_id); 2645 2646 skb = skb_clone(skb, GFP_ATOMIC); 2647 kfree_skb(tmp_skb); 2648 2649 if (!skb) { 2650 ret = -ENOMEM; 2651 goto free; 2652 } 2653 } 2654 2655 hdr.frame_control = fc; 2656 hdr.duration_id = 0; 2657 hdr.seq_ctrl = 0; 2658 2659 skip_header_bytes = ETH_HLEN; 2660 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2661 encaps_data = bridge_tunnel_header; 2662 encaps_len = sizeof(bridge_tunnel_header); 2663 skip_header_bytes -= 2; 2664 } else if (ethertype >= ETH_P_802_3_MIN) { 2665 encaps_data = rfc1042_header; 2666 encaps_len = sizeof(rfc1042_header); 2667 skip_header_bytes -= 2; 2668 } else { 2669 encaps_data = NULL; 2670 encaps_len = 0; 2671 } 2672 2673 skb_pull(skb, skip_header_bytes); 2674 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2675 2676 /* 2677 * So we need to modify the skb header and hence need a copy of 2678 * that. The head_need variable above doesn't, so far, include 2679 * the needed header space that we don't need right away. If we 2680 * can, then we don't reallocate right now but only after the 2681 * frame arrives at the master device (if it does...) 2682 * 2683 * If we cannot, however, then we will reallocate to include all 2684 * the ever needed space. Also, if we need to reallocate it anyway, 2685 * make it big enough for everything we may ever need. 2686 */ 2687 2688 if (head_need > 0 || skb_cloned(skb)) { 2689 head_need += sdata->encrypt_headroom; 2690 head_need += local->tx_headroom; 2691 head_need = max_t(int, 0, head_need); 2692 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2693 ieee80211_free_txskb(&local->hw, skb); 2694 skb = NULL; 2695 return ERR_PTR(-ENOMEM); 2696 } 2697 } 2698 2699 if (encaps_data) 2700 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2701 2702 #ifdef CONFIG_MAC80211_MESH 2703 if (meshhdrlen > 0) 2704 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2705 #endif 2706 2707 if (ieee80211_is_data_qos(fc)) { 2708 __le16 *qos_control; 2709 2710 qos_control = (__le16 *) skb_push(skb, 2); 2711 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2712 /* 2713 * Maybe we could actually set some fields here, for now just 2714 * initialise to zero to indicate no special operation. 2715 */ 2716 *qos_control = 0; 2717 } else 2718 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2719 2720 skb_reset_mac_header(skb); 2721 2722 info = IEEE80211_SKB_CB(skb); 2723 memset(info, 0, sizeof(*info)); 2724 2725 info->flags = info_flags; 2726 info->ack_frame_id = info_id; 2727 info->band = band; 2728 2729 return skb; 2730 free: 2731 kfree_skb(skb); 2732 return ERR_PTR(ret); 2733 } 2734 2735 /* 2736 * fast-xmit overview 2737 * 2738 * The core idea of this fast-xmit is to remove per-packet checks by checking 2739 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2740 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2741 * much less work can be done per packet. For example, fragmentation must be 2742 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2743 * in the code here. 2744 * 2745 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2746 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2747 * 2748 * The most difficult part of this is that when any of these assumptions 2749 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2750 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2751 * since the per-packet code no longer checks the conditions. This is reflected 2752 * by the calls to these functions throughout the rest of the code, and must be 2753 * maintained if any of the TX path checks change. 2754 */ 2755 2756 void ieee80211_check_fast_xmit(struct sta_info *sta) 2757 { 2758 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2759 struct ieee80211_local *local = sta->local; 2760 struct ieee80211_sub_if_data *sdata = sta->sdata; 2761 struct ieee80211_hdr *hdr = (void *)build.hdr; 2762 struct ieee80211_chanctx_conf *chanctx_conf; 2763 __le16 fc; 2764 2765 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2766 return; 2767 2768 /* Locking here protects both the pointer itself, and against concurrent 2769 * invocations winning data access races to, e.g., the key pointer that 2770 * is used. 2771 * Without it, the invocation of this function right after the key 2772 * pointer changes wouldn't be sufficient, as another CPU could access 2773 * the pointer, then stall, and then do the cache update after the CPU 2774 * that invalidated the key. 2775 * With the locking, such scenarios cannot happen as the check for the 2776 * key and the fast-tx assignment are done atomically, so the CPU that 2777 * modifies the key will either wait or other one will see the key 2778 * cleared/changed already. 2779 */ 2780 spin_lock_bh(&sta->lock); 2781 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2782 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2783 sdata->vif.type == NL80211_IFTYPE_STATION) 2784 goto out; 2785 2786 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2787 goto out; 2788 2789 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2790 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2791 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2792 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2793 goto out; 2794 2795 if (sdata->noack_map) 2796 goto out; 2797 2798 /* fast-xmit doesn't handle fragmentation at all */ 2799 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2800 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2801 goto out; 2802 2803 rcu_read_lock(); 2804 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2805 if (!chanctx_conf) { 2806 rcu_read_unlock(); 2807 goto out; 2808 } 2809 build.band = chanctx_conf->def.chan->band; 2810 rcu_read_unlock(); 2811 2812 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2813 2814 switch (sdata->vif.type) { 2815 case NL80211_IFTYPE_ADHOC: 2816 /* DA SA BSSID */ 2817 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2818 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2819 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2820 build.hdr_len = 24; 2821 break; 2822 case NL80211_IFTYPE_STATION: 2823 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2824 /* DA SA BSSID */ 2825 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2826 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2827 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2828 build.hdr_len = 24; 2829 break; 2830 } 2831 2832 if (sdata->u.mgd.use_4addr) { 2833 /* non-regular ethertype cannot use the fastpath */ 2834 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2835 IEEE80211_FCTL_TODS); 2836 /* RA TA DA SA */ 2837 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2838 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2839 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2840 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2841 build.hdr_len = 30; 2842 break; 2843 } 2844 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2845 /* BSSID SA DA */ 2846 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2847 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2848 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2849 build.hdr_len = 24; 2850 break; 2851 case NL80211_IFTYPE_AP_VLAN: 2852 if (sdata->wdev.use_4addr) { 2853 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2854 IEEE80211_FCTL_TODS); 2855 /* RA TA DA SA */ 2856 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2857 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2858 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2859 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2860 build.hdr_len = 30; 2861 break; 2862 } 2863 /* fall through */ 2864 case NL80211_IFTYPE_AP: 2865 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2866 /* DA BSSID SA */ 2867 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2868 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2869 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2870 build.hdr_len = 24; 2871 break; 2872 default: 2873 /* not handled on fast-xmit */ 2874 goto out; 2875 } 2876 2877 if (sta->sta.wme) { 2878 build.hdr_len += 2; 2879 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2880 } 2881 2882 /* We store the key here so there's no point in using rcu_dereference() 2883 * but that's fine because the code that changes the pointers will call 2884 * this function after doing so. For a single CPU that would be enough, 2885 * for multiple see the comment above. 2886 */ 2887 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2888 if (!build.key) 2889 build.key = rcu_access_pointer(sdata->default_unicast_key); 2890 if (build.key) { 2891 bool gen_iv, iv_spc, mmic; 2892 2893 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2894 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2895 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2896 2897 /* don't handle software crypto */ 2898 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2899 goto out; 2900 2901 switch (build.key->conf.cipher) { 2902 case WLAN_CIPHER_SUITE_CCMP: 2903 case WLAN_CIPHER_SUITE_CCMP_256: 2904 /* add fixed key ID */ 2905 if (gen_iv) { 2906 (build.hdr + build.hdr_len)[3] = 2907 0x20 | (build.key->conf.keyidx << 6); 2908 build.pn_offs = build.hdr_len; 2909 } 2910 if (gen_iv || iv_spc) 2911 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2912 break; 2913 case WLAN_CIPHER_SUITE_GCMP: 2914 case WLAN_CIPHER_SUITE_GCMP_256: 2915 /* add fixed key ID */ 2916 if (gen_iv) { 2917 (build.hdr + build.hdr_len)[3] = 2918 0x20 | (build.key->conf.keyidx << 6); 2919 build.pn_offs = build.hdr_len; 2920 } 2921 if (gen_iv || iv_spc) 2922 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2923 break; 2924 case WLAN_CIPHER_SUITE_TKIP: 2925 /* cannot handle MMIC or IV generation in xmit-fast */ 2926 if (mmic || gen_iv) 2927 goto out; 2928 if (iv_spc) 2929 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2930 break; 2931 case WLAN_CIPHER_SUITE_WEP40: 2932 case WLAN_CIPHER_SUITE_WEP104: 2933 /* cannot handle IV generation in fast-xmit */ 2934 if (gen_iv) 2935 goto out; 2936 if (iv_spc) 2937 build.hdr_len += IEEE80211_WEP_IV_LEN; 2938 break; 2939 case WLAN_CIPHER_SUITE_AES_CMAC: 2940 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2941 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2942 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2943 WARN(1, 2944 "management cipher suite 0x%x enabled for data\n", 2945 build.key->conf.cipher); 2946 goto out; 2947 default: 2948 /* we don't know how to generate IVs for this at all */ 2949 if (WARN_ON(gen_iv)) 2950 goto out; 2951 /* pure hardware keys are OK, of course */ 2952 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2953 break; 2954 /* cipher scheme might require space allocation */ 2955 if (iv_spc && 2956 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2957 goto out; 2958 if (iv_spc) 2959 build.hdr_len += build.key->conf.iv_len; 2960 } 2961 2962 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2963 } 2964 2965 hdr->frame_control = fc; 2966 2967 memcpy(build.hdr + build.hdr_len, 2968 rfc1042_header, sizeof(rfc1042_header)); 2969 build.hdr_len += sizeof(rfc1042_header); 2970 2971 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2972 /* if the kmemdup fails, continue w/o fast_tx */ 2973 if (!fast_tx) 2974 goto out; 2975 2976 out: 2977 /* we might have raced against another call to this function */ 2978 old = rcu_dereference_protected(sta->fast_tx, 2979 lockdep_is_held(&sta->lock)); 2980 rcu_assign_pointer(sta->fast_tx, fast_tx); 2981 if (old) 2982 kfree_rcu(old, rcu_head); 2983 spin_unlock_bh(&sta->lock); 2984 } 2985 2986 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2987 { 2988 struct sta_info *sta; 2989 2990 rcu_read_lock(); 2991 list_for_each_entry_rcu(sta, &local->sta_list, list) 2992 ieee80211_check_fast_xmit(sta); 2993 rcu_read_unlock(); 2994 } 2995 2996 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2997 { 2998 struct ieee80211_local *local = sdata->local; 2999 struct sta_info *sta; 3000 3001 rcu_read_lock(); 3002 3003 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3004 if (sdata != sta->sdata && 3005 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3006 continue; 3007 ieee80211_check_fast_xmit(sta); 3008 } 3009 3010 rcu_read_unlock(); 3011 } 3012 3013 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3014 { 3015 struct ieee80211_fast_tx *fast_tx; 3016 3017 spin_lock_bh(&sta->lock); 3018 fast_tx = rcu_dereference_protected(sta->fast_tx, 3019 lockdep_is_held(&sta->lock)); 3020 RCU_INIT_POINTER(sta->fast_tx, NULL); 3021 spin_unlock_bh(&sta->lock); 3022 3023 if (fast_tx) 3024 kfree_rcu(fast_tx, rcu_head); 3025 } 3026 3027 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3028 struct sk_buff *skb, int headroom, 3029 int *subframe_len) 3030 { 3031 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3032 int padding = (4 - amsdu_len) & 3; 3033 3034 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3035 I802_DEBUG_INC(local->tx_expand_skb_head); 3036 3037 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3038 wiphy_debug(local->hw.wiphy, 3039 "failed to reallocate TX buffer\n"); 3040 return false; 3041 } 3042 } 3043 3044 if (padding) { 3045 *subframe_len += padding; 3046 memset(skb_put(skb, padding), 0, padding); 3047 } 3048 3049 return true; 3050 } 3051 3052 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3053 struct ieee80211_fast_tx *fast_tx, 3054 struct sk_buff *skb) 3055 { 3056 struct ieee80211_local *local = sdata->local; 3057 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3058 struct ieee80211_hdr *hdr; 3059 struct ethhdr *amsdu_hdr; 3060 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3061 int subframe_len = skb->len - hdr_len; 3062 void *data; 3063 u8 *qc, *h_80211_src, *h_80211_dst; 3064 const u8 *bssid; 3065 3066 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3067 return false; 3068 3069 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3070 return true; 3071 3072 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3073 &subframe_len)) 3074 return false; 3075 3076 data = skb_push(skb, sizeof(*amsdu_hdr)); 3077 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3078 hdr = data; 3079 amsdu_hdr = data + hdr_len; 3080 /* h_80211_src/dst is addr* field within hdr */ 3081 h_80211_src = data + fast_tx->sa_offs; 3082 h_80211_dst = data + fast_tx->da_offs; 3083 3084 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3085 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3086 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3087 3088 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3089 * fields needs to be changed to BSSID for A-MSDU frames depending 3090 * on FromDS/ToDS values. 3091 */ 3092 switch (sdata->vif.type) { 3093 case NL80211_IFTYPE_STATION: 3094 bssid = sdata->u.mgd.bssid; 3095 break; 3096 case NL80211_IFTYPE_AP: 3097 case NL80211_IFTYPE_AP_VLAN: 3098 bssid = sdata->vif.addr; 3099 break; 3100 default: 3101 bssid = NULL; 3102 } 3103 3104 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3105 ether_addr_copy(h_80211_src, bssid); 3106 3107 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3108 ether_addr_copy(h_80211_dst, bssid); 3109 3110 qc = ieee80211_get_qos_ctl(hdr); 3111 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3112 3113 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3114 3115 return true; 3116 } 3117 3118 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3119 struct sta_info *sta, 3120 struct ieee80211_fast_tx *fast_tx, 3121 struct sk_buff *skb) 3122 { 3123 struct ieee80211_local *local = sdata->local; 3124 struct fq *fq = &local->fq; 3125 struct fq_tin *tin; 3126 struct fq_flow *flow; 3127 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3128 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3129 struct txq_info *txqi; 3130 struct sk_buff **frag_tail, *head; 3131 int subframe_len = skb->len - ETH_ALEN; 3132 u8 max_subframes = sta->sta.max_amsdu_subframes; 3133 int max_frags = local->hw.max_tx_fragments; 3134 int max_amsdu_len = sta->sta.max_amsdu_len; 3135 __be16 len; 3136 void *data; 3137 bool ret = false; 3138 unsigned int orig_len; 3139 int n = 1, nfrags; 3140 3141 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3142 return false; 3143 3144 if (!txq) 3145 return false; 3146 3147 txqi = to_txq_info(txq); 3148 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3149 return false; 3150 3151 if (sta->sta.max_rc_amsdu_len) 3152 max_amsdu_len = min_t(int, max_amsdu_len, 3153 sta->sta.max_rc_amsdu_len); 3154 3155 spin_lock_bh(&fq->lock); 3156 3157 /* TODO: Ideally aggregation should be done on dequeue to remain 3158 * responsive to environment changes. 3159 */ 3160 3161 tin = &txqi->tin; 3162 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3163 head = skb_peek_tail(&flow->queue); 3164 if (!head) 3165 goto out; 3166 3167 orig_len = head->len; 3168 3169 if (skb->len + head->len > max_amsdu_len) 3170 goto out; 3171 3172 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3173 goto out; 3174 3175 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3176 nfrags += 1 + skb_shinfo(head)->nr_frags; 3177 frag_tail = &skb_shinfo(head)->frag_list; 3178 while (*frag_tail) { 3179 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3180 frag_tail = &(*frag_tail)->next; 3181 n++; 3182 } 3183 3184 if (max_subframes && n > max_subframes) 3185 goto out; 3186 3187 if (max_frags && nfrags > max_frags) 3188 goto out; 3189 3190 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3191 &subframe_len)) 3192 goto out; 3193 3194 ret = true; 3195 data = skb_push(skb, ETH_ALEN + 2); 3196 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3197 3198 data += 2 * ETH_ALEN; 3199 len = cpu_to_be16(subframe_len); 3200 memcpy(data, &len, 2); 3201 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3202 3203 head->len += skb->len; 3204 head->data_len += skb->len; 3205 *frag_tail = skb; 3206 3207 flow->backlog += head->len - orig_len; 3208 tin->backlog_bytes += head->len - orig_len; 3209 3210 fq_recalc_backlog(fq, tin, flow); 3211 3212 out: 3213 spin_unlock_bh(&fq->lock); 3214 3215 return ret; 3216 } 3217 3218 /* 3219 * Can be called while the sta lock is held. Anything that can cause packets to 3220 * be generated will cause deadlock! 3221 */ 3222 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3223 struct sta_info *sta, u8 pn_offs, 3224 struct ieee80211_key *key, 3225 struct sk_buff *skb) 3226 { 3227 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3228 struct ieee80211_hdr *hdr = (void *)skb->data; 3229 u8 tid = IEEE80211_NUM_TIDS; 3230 3231 if (key) 3232 info->control.hw_key = &key->conf; 3233 3234 ieee80211_tx_stats(skb->dev, skb->len); 3235 3236 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3237 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3238 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3239 } else { 3240 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3241 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3242 sdata->sequence_number += 0x10; 3243 } 3244 3245 if (skb_shinfo(skb)->gso_size) 3246 sta->tx_stats.msdu[tid] += 3247 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3248 else 3249 sta->tx_stats.msdu[tid]++; 3250 3251 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3252 3253 /* statistics normally done by ieee80211_tx_h_stats (but that 3254 * has to consider fragmentation, so is more complex) 3255 */ 3256 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3257 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3258 3259 if (pn_offs) { 3260 u64 pn; 3261 u8 *crypto_hdr = skb->data + pn_offs; 3262 3263 switch (key->conf.cipher) { 3264 case WLAN_CIPHER_SUITE_CCMP: 3265 case WLAN_CIPHER_SUITE_CCMP_256: 3266 case WLAN_CIPHER_SUITE_GCMP: 3267 case WLAN_CIPHER_SUITE_GCMP_256: 3268 pn = atomic64_inc_return(&key->conf.tx_pn); 3269 crypto_hdr[0] = pn; 3270 crypto_hdr[1] = pn >> 8; 3271 crypto_hdr[4] = pn >> 16; 3272 crypto_hdr[5] = pn >> 24; 3273 crypto_hdr[6] = pn >> 32; 3274 crypto_hdr[7] = pn >> 40; 3275 break; 3276 } 3277 } 3278 } 3279 3280 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3281 struct sta_info *sta, 3282 struct ieee80211_fast_tx *fast_tx, 3283 struct sk_buff *skb) 3284 { 3285 struct ieee80211_local *local = sdata->local; 3286 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3287 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3288 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3289 struct ethhdr eth; 3290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3291 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3292 struct ieee80211_tx_data tx; 3293 ieee80211_tx_result r; 3294 struct tid_ampdu_tx *tid_tx = NULL; 3295 u8 tid = IEEE80211_NUM_TIDS; 3296 3297 /* control port protocol needs a lot of special handling */ 3298 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3299 return false; 3300 3301 /* only RFC 1042 SNAP */ 3302 if (ethertype < ETH_P_802_3_MIN) 3303 return false; 3304 3305 /* don't handle TX status request here either */ 3306 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3307 return false; 3308 3309 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3310 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3311 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3312 if (tid_tx) { 3313 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3314 return false; 3315 if (tid_tx->timeout) 3316 tid_tx->last_tx = jiffies; 3317 } 3318 } 3319 3320 /* after this point (skb is modified) we cannot return false */ 3321 3322 if (skb_shared(skb)) { 3323 struct sk_buff *tmp_skb = skb; 3324 3325 skb = skb_clone(skb, GFP_ATOMIC); 3326 kfree_skb(tmp_skb); 3327 3328 if (!skb) 3329 return true; 3330 } 3331 3332 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3333 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3334 return true; 3335 3336 /* will not be crypto-handled beyond what we do here, so use false 3337 * as the may-encrypt argument for the resize to not account for 3338 * more room than we already have in 'extra_head' 3339 */ 3340 if (unlikely(ieee80211_skb_resize(sdata, skb, 3341 max_t(int, extra_head + hw_headroom - 3342 skb_headroom(skb), 0), 3343 false))) { 3344 kfree_skb(skb); 3345 return true; 3346 } 3347 3348 memcpy(ð, skb->data, ETH_HLEN - 2); 3349 hdr = (void *)skb_push(skb, extra_head); 3350 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3351 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3352 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3353 3354 memset(info, 0, sizeof(*info)); 3355 info->band = fast_tx->band; 3356 info->control.vif = &sdata->vif; 3357 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3358 IEEE80211_TX_CTL_DONTFRAG | 3359 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3360 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3361 3362 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3363 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3364 *ieee80211_get_qos_ctl(hdr) = tid; 3365 } 3366 3367 __skb_queue_head_init(&tx.skbs); 3368 3369 tx.flags = IEEE80211_TX_UNICAST; 3370 tx.local = local; 3371 tx.sdata = sdata; 3372 tx.sta = sta; 3373 tx.key = fast_tx->key; 3374 3375 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3376 tx.skb = skb; 3377 r = ieee80211_tx_h_rate_ctrl(&tx); 3378 skb = tx.skb; 3379 tx.skb = NULL; 3380 3381 if (r != TX_CONTINUE) { 3382 if (r != TX_QUEUED) 3383 kfree_skb(skb); 3384 return true; 3385 } 3386 } 3387 3388 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3389 return true; 3390 3391 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3392 fast_tx->key, skb); 3393 3394 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3395 sdata = container_of(sdata->bss, 3396 struct ieee80211_sub_if_data, u.ap); 3397 3398 __skb_queue_tail(&tx.skbs, skb); 3399 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3400 return true; 3401 } 3402 3403 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3404 struct ieee80211_txq *txq) 3405 { 3406 struct ieee80211_local *local = hw_to_local(hw); 3407 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3408 struct ieee80211_hdr *hdr; 3409 struct sk_buff *skb = NULL; 3410 struct fq *fq = &local->fq; 3411 struct fq_tin *tin = &txqi->tin; 3412 struct ieee80211_tx_info *info; 3413 struct ieee80211_tx_data tx; 3414 ieee80211_tx_result r; 3415 3416 spin_lock_bh(&fq->lock); 3417 3418 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3419 goto out; 3420 3421 /* Make sure fragments stay together. */ 3422 skb = __skb_dequeue(&txqi->frags); 3423 if (skb) 3424 goto out; 3425 3426 begin: 3427 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3428 if (!skb) 3429 goto out; 3430 3431 ieee80211_set_skb_vif(skb, txqi); 3432 3433 hdr = (struct ieee80211_hdr *)skb->data; 3434 info = IEEE80211_SKB_CB(skb); 3435 3436 memset(&tx, 0, sizeof(tx)); 3437 __skb_queue_head_init(&tx.skbs); 3438 tx.local = local; 3439 tx.skb = skb; 3440 tx.sdata = vif_to_sdata(info->control.vif); 3441 3442 if (txq->sta) 3443 tx.sta = container_of(txq->sta, struct sta_info, sta); 3444 3445 /* 3446 * The key can be removed while the packet was queued, so need to call 3447 * this here to get the current key. 3448 */ 3449 r = ieee80211_tx_h_select_key(&tx); 3450 if (r != TX_CONTINUE) { 3451 ieee80211_free_txskb(&local->hw, skb); 3452 goto begin; 3453 } 3454 3455 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3456 info->flags |= IEEE80211_TX_CTL_AMPDU; 3457 else 3458 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3459 3460 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3461 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3462 sta); 3463 u8 pn_offs = 0; 3464 3465 if (tx.key && 3466 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3467 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3468 3469 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3470 tx.key, skb); 3471 } else { 3472 if (invoke_tx_handlers_late(&tx)) 3473 goto begin; 3474 3475 skb = __skb_dequeue(&tx.skbs); 3476 3477 if (!skb_queue_empty(&tx.skbs)) 3478 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3479 } 3480 3481 if (skb && skb_has_frag_list(skb) && 3482 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3483 if (skb_linearize(skb)) { 3484 ieee80211_free_txskb(&local->hw, skb); 3485 goto begin; 3486 } 3487 } 3488 3489 out: 3490 spin_unlock_bh(&fq->lock); 3491 3492 return skb; 3493 } 3494 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3495 3496 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3497 struct net_device *dev, 3498 u32 info_flags) 3499 { 3500 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3501 struct sta_info *sta; 3502 struct sk_buff *next; 3503 3504 if (unlikely(skb->len < ETH_HLEN)) { 3505 kfree_skb(skb); 3506 return; 3507 } 3508 3509 rcu_read_lock(); 3510 3511 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3512 goto out_free; 3513 3514 if (!IS_ERR_OR_NULL(sta)) { 3515 struct ieee80211_fast_tx *fast_tx; 3516 3517 fast_tx = rcu_dereference(sta->fast_tx); 3518 3519 if (fast_tx && 3520 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3521 goto out; 3522 } 3523 3524 if (skb_is_gso(skb)) { 3525 struct sk_buff *segs; 3526 3527 segs = skb_gso_segment(skb, 0); 3528 if (IS_ERR(segs)) { 3529 goto out_free; 3530 } else if (segs) { 3531 consume_skb(skb); 3532 skb = segs; 3533 } 3534 } else { 3535 /* we cannot process non-linear frames on this path */ 3536 if (skb_linearize(skb)) { 3537 kfree_skb(skb); 3538 goto out; 3539 } 3540 3541 /* the frame could be fragmented, software-encrypted, and other 3542 * things so we cannot really handle checksum offload with it - 3543 * fix it up in software before we handle anything else. 3544 */ 3545 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3546 skb_set_transport_header(skb, 3547 skb_checksum_start_offset(skb)); 3548 if (skb_checksum_help(skb)) 3549 goto out_free; 3550 } 3551 } 3552 3553 next = skb; 3554 while (next) { 3555 skb = next; 3556 next = skb->next; 3557 3558 skb->prev = NULL; 3559 skb->next = NULL; 3560 3561 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3562 if (IS_ERR(skb)) 3563 goto out; 3564 3565 ieee80211_tx_stats(dev, skb->len); 3566 3567 ieee80211_xmit(sdata, sta, skb); 3568 } 3569 goto out; 3570 out_free: 3571 kfree_skb(skb); 3572 out: 3573 rcu_read_unlock(); 3574 } 3575 3576 /** 3577 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3578 * @skb: packet to be sent 3579 * @dev: incoming interface 3580 * 3581 * On failure skb will be freed. 3582 */ 3583 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3584 struct net_device *dev) 3585 { 3586 __ieee80211_subif_start_xmit(skb, dev, 0); 3587 return NETDEV_TX_OK; 3588 } 3589 3590 struct sk_buff * 3591 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3592 struct sk_buff *skb, u32 info_flags) 3593 { 3594 struct ieee80211_hdr *hdr; 3595 struct ieee80211_tx_data tx = { 3596 .local = sdata->local, 3597 .sdata = sdata, 3598 }; 3599 struct sta_info *sta; 3600 3601 rcu_read_lock(); 3602 3603 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3604 kfree_skb(skb); 3605 skb = ERR_PTR(-EINVAL); 3606 goto out; 3607 } 3608 3609 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3610 if (IS_ERR(skb)) 3611 goto out; 3612 3613 hdr = (void *)skb->data; 3614 tx.sta = sta_info_get(sdata, hdr->addr1); 3615 tx.skb = skb; 3616 3617 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3618 rcu_read_unlock(); 3619 kfree_skb(skb); 3620 return ERR_PTR(-EINVAL); 3621 } 3622 3623 out: 3624 rcu_read_unlock(); 3625 return skb; 3626 } 3627 3628 /* 3629 * ieee80211_clear_tx_pending may not be called in a context where 3630 * it is possible that it packets could come in again. 3631 */ 3632 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3633 { 3634 struct sk_buff *skb; 3635 int i; 3636 3637 for (i = 0; i < local->hw.queues; i++) { 3638 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3639 ieee80211_free_txskb(&local->hw, skb); 3640 } 3641 } 3642 3643 /* 3644 * Returns false if the frame couldn't be transmitted but was queued instead, 3645 * which in this case means re-queued -- take as an indication to stop sending 3646 * more pending frames. 3647 */ 3648 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3649 struct sk_buff *skb) 3650 { 3651 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3652 struct ieee80211_sub_if_data *sdata; 3653 struct sta_info *sta; 3654 struct ieee80211_hdr *hdr; 3655 bool result; 3656 struct ieee80211_chanctx_conf *chanctx_conf; 3657 3658 sdata = vif_to_sdata(info->control.vif); 3659 3660 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3661 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3662 if (unlikely(!chanctx_conf)) { 3663 dev_kfree_skb(skb); 3664 return true; 3665 } 3666 info->band = chanctx_conf->def.chan->band; 3667 result = ieee80211_tx(sdata, NULL, skb, true); 3668 } else { 3669 struct sk_buff_head skbs; 3670 3671 __skb_queue_head_init(&skbs); 3672 __skb_queue_tail(&skbs, skb); 3673 3674 hdr = (struct ieee80211_hdr *)skb->data; 3675 sta = sta_info_get(sdata, hdr->addr1); 3676 3677 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3678 } 3679 3680 return result; 3681 } 3682 3683 /* 3684 * Transmit all pending packets. Called from tasklet. 3685 */ 3686 void ieee80211_tx_pending(unsigned long data) 3687 { 3688 struct ieee80211_local *local = (struct ieee80211_local *)data; 3689 unsigned long flags; 3690 int i; 3691 bool txok; 3692 3693 rcu_read_lock(); 3694 3695 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3696 for (i = 0; i < local->hw.queues; i++) { 3697 /* 3698 * If queue is stopped by something other than due to pending 3699 * frames, or we have no pending frames, proceed to next queue. 3700 */ 3701 if (local->queue_stop_reasons[i] || 3702 skb_queue_empty(&local->pending[i])) 3703 continue; 3704 3705 while (!skb_queue_empty(&local->pending[i])) { 3706 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3707 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3708 3709 if (WARN_ON(!info->control.vif)) { 3710 ieee80211_free_txskb(&local->hw, skb); 3711 continue; 3712 } 3713 3714 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3715 flags); 3716 3717 txok = ieee80211_tx_pending_skb(local, skb); 3718 spin_lock_irqsave(&local->queue_stop_reason_lock, 3719 flags); 3720 if (!txok) 3721 break; 3722 } 3723 3724 if (skb_queue_empty(&local->pending[i])) 3725 ieee80211_propagate_queue_wake(local, i); 3726 } 3727 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3728 3729 rcu_read_unlock(); 3730 } 3731 3732 /* functions for drivers to get certain frames */ 3733 3734 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3735 struct ps_data *ps, struct sk_buff *skb, 3736 bool is_template) 3737 { 3738 u8 *pos, *tim; 3739 int aid0 = 0; 3740 int i, have_bits = 0, n1, n2; 3741 3742 /* Generate bitmap for TIM only if there are any STAs in power save 3743 * mode. */ 3744 if (atomic_read(&ps->num_sta_ps) > 0) 3745 /* in the hope that this is faster than 3746 * checking byte-for-byte */ 3747 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3748 IEEE80211_MAX_AID+1); 3749 if (!is_template) { 3750 if (ps->dtim_count == 0) 3751 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3752 else 3753 ps->dtim_count--; 3754 } 3755 3756 tim = pos = (u8 *) skb_put(skb, 6); 3757 *pos++ = WLAN_EID_TIM; 3758 *pos++ = 4; 3759 *pos++ = ps->dtim_count; 3760 *pos++ = sdata->vif.bss_conf.dtim_period; 3761 3762 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3763 aid0 = 1; 3764 3765 ps->dtim_bc_mc = aid0 == 1; 3766 3767 if (have_bits) { 3768 /* Find largest even number N1 so that bits numbered 1 through 3769 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3770 * (N2 + 1) x 8 through 2007 are 0. */ 3771 n1 = 0; 3772 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3773 if (ps->tim[i]) { 3774 n1 = i & 0xfe; 3775 break; 3776 } 3777 } 3778 n2 = n1; 3779 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3780 if (ps->tim[i]) { 3781 n2 = i; 3782 break; 3783 } 3784 } 3785 3786 /* Bitmap control */ 3787 *pos++ = n1 | aid0; 3788 /* Part Virt Bitmap */ 3789 skb_put(skb, n2 - n1); 3790 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3791 3792 tim[1] = n2 - n1 + 4; 3793 } else { 3794 *pos++ = aid0; /* Bitmap control */ 3795 *pos++ = 0; /* Part Virt Bitmap */ 3796 } 3797 } 3798 3799 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3800 struct ps_data *ps, struct sk_buff *skb, 3801 bool is_template) 3802 { 3803 struct ieee80211_local *local = sdata->local; 3804 3805 /* 3806 * Not very nice, but we want to allow the driver to call 3807 * ieee80211_beacon_get() as a response to the set_tim() 3808 * callback. That, however, is already invoked under the 3809 * sta_lock to guarantee consistent and race-free update 3810 * of the tim bitmap in mac80211 and the driver. 3811 */ 3812 if (local->tim_in_locked_section) { 3813 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3814 } else { 3815 spin_lock_bh(&local->tim_lock); 3816 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3817 spin_unlock_bh(&local->tim_lock); 3818 } 3819 3820 return 0; 3821 } 3822 3823 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3824 struct beacon_data *beacon) 3825 { 3826 struct probe_resp *resp; 3827 u8 *beacon_data; 3828 size_t beacon_data_len; 3829 int i; 3830 u8 count = beacon->csa_current_counter; 3831 3832 switch (sdata->vif.type) { 3833 case NL80211_IFTYPE_AP: 3834 beacon_data = beacon->tail; 3835 beacon_data_len = beacon->tail_len; 3836 break; 3837 case NL80211_IFTYPE_ADHOC: 3838 beacon_data = beacon->head; 3839 beacon_data_len = beacon->head_len; 3840 break; 3841 case NL80211_IFTYPE_MESH_POINT: 3842 beacon_data = beacon->head; 3843 beacon_data_len = beacon->head_len; 3844 break; 3845 default: 3846 return; 3847 } 3848 3849 rcu_read_lock(); 3850 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3851 resp = rcu_dereference(sdata->u.ap.probe_resp); 3852 3853 if (beacon->csa_counter_offsets[i]) { 3854 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3855 beacon_data_len)) { 3856 rcu_read_unlock(); 3857 return; 3858 } 3859 3860 beacon_data[beacon->csa_counter_offsets[i]] = count; 3861 } 3862 3863 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3864 resp->data[resp->csa_counter_offsets[i]] = count; 3865 } 3866 rcu_read_unlock(); 3867 } 3868 3869 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3870 { 3871 beacon->csa_current_counter--; 3872 3873 /* the counter should never reach 0 */ 3874 WARN_ON_ONCE(!beacon->csa_current_counter); 3875 3876 return beacon->csa_current_counter; 3877 } 3878 3879 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3880 { 3881 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3882 struct beacon_data *beacon = NULL; 3883 u8 count = 0; 3884 3885 rcu_read_lock(); 3886 3887 if (sdata->vif.type == NL80211_IFTYPE_AP) 3888 beacon = rcu_dereference(sdata->u.ap.beacon); 3889 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3890 beacon = rcu_dereference(sdata->u.ibss.presp); 3891 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3892 beacon = rcu_dereference(sdata->u.mesh.beacon); 3893 3894 if (!beacon) 3895 goto unlock; 3896 3897 count = __ieee80211_csa_update_counter(beacon); 3898 3899 unlock: 3900 rcu_read_unlock(); 3901 return count; 3902 } 3903 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3904 3905 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3906 { 3907 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3908 struct beacon_data *beacon = NULL; 3909 u8 *beacon_data; 3910 size_t beacon_data_len; 3911 int ret = false; 3912 3913 if (!ieee80211_sdata_running(sdata)) 3914 return false; 3915 3916 rcu_read_lock(); 3917 if (vif->type == NL80211_IFTYPE_AP) { 3918 struct ieee80211_if_ap *ap = &sdata->u.ap; 3919 3920 beacon = rcu_dereference(ap->beacon); 3921 if (WARN_ON(!beacon || !beacon->tail)) 3922 goto out; 3923 beacon_data = beacon->tail; 3924 beacon_data_len = beacon->tail_len; 3925 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3926 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3927 3928 beacon = rcu_dereference(ifibss->presp); 3929 if (!beacon) 3930 goto out; 3931 3932 beacon_data = beacon->head; 3933 beacon_data_len = beacon->head_len; 3934 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3935 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3936 3937 beacon = rcu_dereference(ifmsh->beacon); 3938 if (!beacon) 3939 goto out; 3940 3941 beacon_data = beacon->head; 3942 beacon_data_len = beacon->head_len; 3943 } else { 3944 WARN_ON(1); 3945 goto out; 3946 } 3947 3948 if (!beacon->csa_counter_offsets[0]) 3949 goto out; 3950 3951 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3952 goto out; 3953 3954 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3955 ret = true; 3956 out: 3957 rcu_read_unlock(); 3958 3959 return ret; 3960 } 3961 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3962 3963 static struct sk_buff * 3964 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3965 struct ieee80211_vif *vif, 3966 struct ieee80211_mutable_offsets *offs, 3967 bool is_template) 3968 { 3969 struct ieee80211_local *local = hw_to_local(hw); 3970 struct beacon_data *beacon = NULL; 3971 struct sk_buff *skb = NULL; 3972 struct ieee80211_tx_info *info; 3973 struct ieee80211_sub_if_data *sdata = NULL; 3974 enum nl80211_band band; 3975 struct ieee80211_tx_rate_control txrc; 3976 struct ieee80211_chanctx_conf *chanctx_conf; 3977 int csa_off_base = 0; 3978 3979 rcu_read_lock(); 3980 3981 sdata = vif_to_sdata(vif); 3982 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3983 3984 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3985 goto out; 3986 3987 if (offs) 3988 memset(offs, 0, sizeof(*offs)); 3989 3990 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3991 struct ieee80211_if_ap *ap = &sdata->u.ap; 3992 3993 beacon = rcu_dereference(ap->beacon); 3994 if (beacon) { 3995 if (beacon->csa_counter_offsets[0]) { 3996 if (!is_template) 3997 __ieee80211_csa_update_counter(beacon); 3998 3999 ieee80211_set_csa(sdata, beacon); 4000 } 4001 4002 /* 4003 * headroom, head length, 4004 * tail length and maximum TIM length 4005 */ 4006 skb = dev_alloc_skb(local->tx_headroom + 4007 beacon->head_len + 4008 beacon->tail_len + 256 + 4009 local->hw.extra_beacon_tailroom); 4010 if (!skb) 4011 goto out; 4012 4013 skb_reserve(skb, local->tx_headroom); 4014 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4015 beacon->head_len); 4016 4017 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4018 is_template); 4019 4020 if (offs) { 4021 offs->tim_offset = beacon->head_len; 4022 offs->tim_length = skb->len - beacon->head_len; 4023 4024 /* for AP the csa offsets are from tail */ 4025 csa_off_base = skb->len; 4026 } 4027 4028 if (beacon->tail) 4029 memcpy(skb_put(skb, beacon->tail_len), 4030 beacon->tail, beacon->tail_len); 4031 } else 4032 goto out; 4033 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4034 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4035 struct ieee80211_hdr *hdr; 4036 4037 beacon = rcu_dereference(ifibss->presp); 4038 if (!beacon) 4039 goto out; 4040 4041 if (beacon->csa_counter_offsets[0]) { 4042 if (!is_template) 4043 __ieee80211_csa_update_counter(beacon); 4044 4045 ieee80211_set_csa(sdata, beacon); 4046 } 4047 4048 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4049 local->hw.extra_beacon_tailroom); 4050 if (!skb) 4051 goto out; 4052 skb_reserve(skb, local->tx_headroom); 4053 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4054 beacon->head_len); 4055 4056 hdr = (struct ieee80211_hdr *) skb->data; 4057 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4058 IEEE80211_STYPE_BEACON); 4059 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4060 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4061 4062 beacon = rcu_dereference(ifmsh->beacon); 4063 if (!beacon) 4064 goto out; 4065 4066 if (beacon->csa_counter_offsets[0]) { 4067 if (!is_template) 4068 /* TODO: For mesh csa_counter is in TU, so 4069 * decrementing it by one isn't correct, but 4070 * for now we leave it consistent with overall 4071 * mac80211's behavior. 4072 */ 4073 __ieee80211_csa_update_counter(beacon); 4074 4075 ieee80211_set_csa(sdata, beacon); 4076 } 4077 4078 if (ifmsh->sync_ops) 4079 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 4080 4081 skb = dev_alloc_skb(local->tx_headroom + 4082 beacon->head_len + 4083 256 + /* TIM IE */ 4084 beacon->tail_len + 4085 local->hw.extra_beacon_tailroom); 4086 if (!skb) 4087 goto out; 4088 skb_reserve(skb, local->tx_headroom); 4089 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4090 beacon->head_len); 4091 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4092 4093 if (offs) { 4094 offs->tim_offset = beacon->head_len; 4095 offs->tim_length = skb->len - beacon->head_len; 4096 } 4097 4098 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 4099 beacon->tail_len); 4100 } else { 4101 WARN_ON(1); 4102 goto out; 4103 } 4104 4105 /* CSA offsets */ 4106 if (offs && beacon) { 4107 int i; 4108 4109 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4110 u16 csa_off = beacon->csa_counter_offsets[i]; 4111 4112 if (!csa_off) 4113 continue; 4114 4115 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4116 } 4117 } 4118 4119 band = chanctx_conf->def.chan->band; 4120 4121 info = IEEE80211_SKB_CB(skb); 4122 4123 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4124 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4125 info->band = band; 4126 4127 memset(&txrc, 0, sizeof(txrc)); 4128 txrc.hw = hw; 4129 txrc.sband = local->hw.wiphy->bands[band]; 4130 txrc.bss_conf = &sdata->vif.bss_conf; 4131 txrc.skb = skb; 4132 txrc.reported_rate.idx = -1; 4133 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4134 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 4135 txrc.max_rate_idx = -1; 4136 else 4137 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 4138 txrc.bss = true; 4139 rate_control_get_rate(sdata, NULL, &txrc); 4140 4141 info->control.vif = vif; 4142 4143 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4144 IEEE80211_TX_CTL_ASSIGN_SEQ | 4145 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4146 out: 4147 rcu_read_unlock(); 4148 return skb; 4149 4150 } 4151 4152 struct sk_buff * 4153 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4154 struct ieee80211_vif *vif, 4155 struct ieee80211_mutable_offsets *offs) 4156 { 4157 return __ieee80211_beacon_get(hw, vif, offs, true); 4158 } 4159 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4160 4161 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4162 struct ieee80211_vif *vif, 4163 u16 *tim_offset, u16 *tim_length) 4164 { 4165 struct ieee80211_mutable_offsets offs = {}; 4166 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4167 struct sk_buff *copy; 4168 struct ieee80211_supported_band *sband; 4169 int shift; 4170 4171 if (!bcn) 4172 return bcn; 4173 4174 if (tim_offset) 4175 *tim_offset = offs.tim_offset; 4176 4177 if (tim_length) 4178 *tim_length = offs.tim_length; 4179 4180 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4181 !hw_to_local(hw)->monitors) 4182 return bcn; 4183 4184 /* send a copy to monitor interfaces */ 4185 copy = skb_copy(bcn, GFP_ATOMIC); 4186 if (!copy) 4187 return bcn; 4188 4189 shift = ieee80211_vif_get_shift(vif); 4190 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 4191 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4192 4193 return bcn; 4194 } 4195 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4196 4197 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4198 struct ieee80211_vif *vif) 4199 { 4200 struct ieee80211_if_ap *ap = NULL; 4201 struct sk_buff *skb = NULL; 4202 struct probe_resp *presp = NULL; 4203 struct ieee80211_hdr *hdr; 4204 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4205 4206 if (sdata->vif.type != NL80211_IFTYPE_AP) 4207 return NULL; 4208 4209 rcu_read_lock(); 4210 4211 ap = &sdata->u.ap; 4212 presp = rcu_dereference(ap->probe_resp); 4213 if (!presp) 4214 goto out; 4215 4216 skb = dev_alloc_skb(presp->len); 4217 if (!skb) 4218 goto out; 4219 4220 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4221 4222 hdr = (struct ieee80211_hdr *) skb->data; 4223 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4224 4225 out: 4226 rcu_read_unlock(); 4227 return skb; 4228 } 4229 EXPORT_SYMBOL(ieee80211_proberesp_get); 4230 4231 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4232 struct ieee80211_vif *vif) 4233 { 4234 struct ieee80211_sub_if_data *sdata; 4235 struct ieee80211_if_managed *ifmgd; 4236 struct ieee80211_pspoll *pspoll; 4237 struct ieee80211_local *local; 4238 struct sk_buff *skb; 4239 4240 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4241 return NULL; 4242 4243 sdata = vif_to_sdata(vif); 4244 ifmgd = &sdata->u.mgd; 4245 local = sdata->local; 4246 4247 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4248 if (!skb) 4249 return NULL; 4250 4251 skb_reserve(skb, local->hw.extra_tx_headroom); 4252 4253 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4254 memset(pspoll, 0, sizeof(*pspoll)); 4255 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4256 IEEE80211_STYPE_PSPOLL); 4257 pspoll->aid = cpu_to_le16(ifmgd->aid); 4258 4259 /* aid in PS-Poll has its two MSBs each set to 1 */ 4260 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4261 4262 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4263 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4264 4265 return skb; 4266 } 4267 EXPORT_SYMBOL(ieee80211_pspoll_get); 4268 4269 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4270 struct ieee80211_vif *vif) 4271 { 4272 struct ieee80211_hdr_3addr *nullfunc; 4273 struct ieee80211_sub_if_data *sdata; 4274 struct ieee80211_if_managed *ifmgd; 4275 struct ieee80211_local *local; 4276 struct sk_buff *skb; 4277 4278 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4279 return NULL; 4280 4281 sdata = vif_to_sdata(vif); 4282 ifmgd = &sdata->u.mgd; 4283 local = sdata->local; 4284 4285 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4286 if (!skb) 4287 return NULL; 4288 4289 skb_reserve(skb, local->hw.extra_tx_headroom); 4290 4291 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4292 sizeof(*nullfunc)); 4293 memset(nullfunc, 0, sizeof(*nullfunc)); 4294 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4295 IEEE80211_STYPE_NULLFUNC | 4296 IEEE80211_FCTL_TODS); 4297 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4298 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4299 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4300 4301 return skb; 4302 } 4303 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4304 4305 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4306 const u8 *src_addr, 4307 const u8 *ssid, size_t ssid_len, 4308 size_t tailroom) 4309 { 4310 struct ieee80211_local *local = hw_to_local(hw); 4311 struct ieee80211_hdr_3addr *hdr; 4312 struct sk_buff *skb; 4313 size_t ie_ssid_len; 4314 u8 *pos; 4315 4316 ie_ssid_len = 2 + ssid_len; 4317 4318 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4319 ie_ssid_len + tailroom); 4320 if (!skb) 4321 return NULL; 4322 4323 skb_reserve(skb, local->hw.extra_tx_headroom); 4324 4325 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4326 memset(hdr, 0, sizeof(*hdr)); 4327 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4328 IEEE80211_STYPE_PROBE_REQ); 4329 eth_broadcast_addr(hdr->addr1); 4330 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4331 eth_broadcast_addr(hdr->addr3); 4332 4333 pos = skb_put(skb, ie_ssid_len); 4334 *pos++ = WLAN_EID_SSID; 4335 *pos++ = ssid_len; 4336 if (ssid_len) 4337 memcpy(pos, ssid, ssid_len); 4338 pos += ssid_len; 4339 4340 return skb; 4341 } 4342 EXPORT_SYMBOL(ieee80211_probereq_get); 4343 4344 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4345 const void *frame, size_t frame_len, 4346 const struct ieee80211_tx_info *frame_txctl, 4347 struct ieee80211_rts *rts) 4348 { 4349 const struct ieee80211_hdr *hdr = frame; 4350 4351 rts->frame_control = 4352 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4353 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4354 frame_txctl); 4355 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4356 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4357 } 4358 EXPORT_SYMBOL(ieee80211_rts_get); 4359 4360 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4361 const void *frame, size_t frame_len, 4362 const struct ieee80211_tx_info *frame_txctl, 4363 struct ieee80211_cts *cts) 4364 { 4365 const struct ieee80211_hdr *hdr = frame; 4366 4367 cts->frame_control = 4368 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4369 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4370 frame_len, frame_txctl); 4371 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4372 } 4373 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4374 4375 struct sk_buff * 4376 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4377 struct ieee80211_vif *vif) 4378 { 4379 struct ieee80211_local *local = hw_to_local(hw); 4380 struct sk_buff *skb = NULL; 4381 struct ieee80211_tx_data tx; 4382 struct ieee80211_sub_if_data *sdata; 4383 struct ps_data *ps; 4384 struct ieee80211_tx_info *info; 4385 struct ieee80211_chanctx_conf *chanctx_conf; 4386 4387 sdata = vif_to_sdata(vif); 4388 4389 rcu_read_lock(); 4390 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4391 4392 if (!chanctx_conf) 4393 goto out; 4394 4395 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4396 struct beacon_data *beacon = 4397 rcu_dereference(sdata->u.ap.beacon); 4398 4399 if (!beacon || !beacon->head) 4400 goto out; 4401 4402 ps = &sdata->u.ap.ps; 4403 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4404 ps = &sdata->u.mesh.ps; 4405 } else { 4406 goto out; 4407 } 4408 4409 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4410 goto out; /* send buffered bc/mc only after DTIM beacon */ 4411 4412 while (1) { 4413 skb = skb_dequeue(&ps->bc_buf); 4414 if (!skb) 4415 goto out; 4416 local->total_ps_buffered--; 4417 4418 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4419 struct ieee80211_hdr *hdr = 4420 (struct ieee80211_hdr *) skb->data; 4421 /* more buffered multicast/broadcast frames ==> set 4422 * MoreData flag in IEEE 802.11 header to inform PS 4423 * STAs */ 4424 hdr->frame_control |= 4425 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4426 } 4427 4428 if (sdata->vif.type == NL80211_IFTYPE_AP) 4429 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4430 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4431 break; 4432 ieee80211_free_txskb(hw, skb); 4433 } 4434 4435 info = IEEE80211_SKB_CB(skb); 4436 4437 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4438 info->band = chanctx_conf->def.chan->band; 4439 4440 if (invoke_tx_handlers(&tx)) 4441 skb = NULL; 4442 out: 4443 rcu_read_unlock(); 4444 4445 return skb; 4446 } 4447 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4448 4449 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4450 { 4451 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4452 struct ieee80211_sub_if_data *sdata = sta->sdata; 4453 struct ieee80211_local *local = sdata->local; 4454 int ret; 4455 u32 queues; 4456 4457 lockdep_assert_held(&local->sta_mtx); 4458 4459 /* only some cases are supported right now */ 4460 switch (sdata->vif.type) { 4461 case NL80211_IFTYPE_STATION: 4462 case NL80211_IFTYPE_AP: 4463 case NL80211_IFTYPE_AP_VLAN: 4464 break; 4465 default: 4466 WARN_ON(1); 4467 return -EINVAL; 4468 } 4469 4470 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4471 return -EINVAL; 4472 4473 if (sta->reserved_tid == tid) { 4474 ret = 0; 4475 goto out; 4476 } 4477 4478 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4479 sdata_err(sdata, "TID reservation already active\n"); 4480 ret = -EALREADY; 4481 goto out; 4482 } 4483 4484 ieee80211_stop_vif_queues(sdata->local, sdata, 4485 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4486 4487 synchronize_net(); 4488 4489 /* Tear down BA sessions so we stop aggregating on this TID */ 4490 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4491 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4492 __ieee80211_stop_tx_ba_session(sta, tid, 4493 AGG_STOP_LOCAL_REQUEST); 4494 } 4495 4496 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4497 __ieee80211_flush_queues(local, sdata, queues, false); 4498 4499 sta->reserved_tid = tid; 4500 4501 ieee80211_wake_vif_queues(local, sdata, 4502 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4503 4504 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4505 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4506 4507 ret = 0; 4508 out: 4509 return ret; 4510 } 4511 EXPORT_SYMBOL(ieee80211_reserve_tid); 4512 4513 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4514 { 4515 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4516 struct ieee80211_sub_if_data *sdata = sta->sdata; 4517 4518 lockdep_assert_held(&sdata->local->sta_mtx); 4519 4520 /* only some cases are supported right now */ 4521 switch (sdata->vif.type) { 4522 case NL80211_IFTYPE_STATION: 4523 case NL80211_IFTYPE_AP: 4524 case NL80211_IFTYPE_AP_VLAN: 4525 break; 4526 default: 4527 WARN_ON(1); 4528 return; 4529 } 4530 4531 if (tid != sta->reserved_tid) { 4532 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4533 return; 4534 } 4535 4536 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4537 } 4538 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4539 4540 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4541 struct sk_buff *skb, int tid, 4542 enum nl80211_band band) 4543 { 4544 int ac = ieee802_1d_to_ac[tid & 7]; 4545 4546 skb_reset_mac_header(skb); 4547 skb_set_queue_mapping(skb, ac); 4548 skb->priority = tid; 4549 4550 skb->dev = sdata->dev; 4551 4552 /* 4553 * The other path calling ieee80211_xmit is from the tasklet, 4554 * and while we can handle concurrent transmissions locking 4555 * requirements are that we do not come into tx with bhs on. 4556 */ 4557 local_bh_disable(); 4558 IEEE80211_SKB_CB(skb)->band = band; 4559 ieee80211_xmit(sdata, NULL, skb); 4560 local_bh_enable(); 4561 } 4562