1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "led.h" 32 #include "mesh.h" 33 #include "wep.h" 34 #include "wpa.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 /* misc utils */ 39 40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 41 { 42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 43 44 u64_stats_update_begin(&tstats->syncp); 45 tstats->tx_packets++; 46 tstats->tx_bytes += len; 47 u64_stats_update_end(&tstats->syncp); 48 } 49 50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 51 struct sk_buff *skb, int group_addr, 52 int next_frag_len) 53 { 54 int rate, mrate, erp, dur, i, shift = 0; 55 struct ieee80211_rate *txrate; 56 struct ieee80211_local *local = tx->local; 57 struct ieee80211_supported_band *sband; 58 struct ieee80211_hdr *hdr; 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 60 struct ieee80211_chanctx_conf *chanctx_conf; 61 u32 rate_flags = 0; 62 63 rcu_read_lock(); 64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 65 if (chanctx_conf) { 66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 68 } 69 rcu_read_unlock(); 70 71 /* assume HW handles this */ 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 73 return 0; 74 75 /* uh huh? */ 76 if (WARN_ON_ONCE(tx->rate.idx < 0)) 77 return 0; 78 79 sband = local->hw.wiphy->bands[info->band]; 80 txrate = &sband->bitrates[tx->rate.idx]; 81 82 erp = txrate->flags & IEEE80211_RATE_ERP_G; 83 84 /* 85 * data and mgmt (except PS Poll): 86 * - during CFP: 32768 87 * - during contention period: 88 * if addr1 is group address: 0 89 * if more fragments = 0 and addr1 is individual address: time to 90 * transmit one ACK plus SIFS 91 * if more fragments = 1 and addr1 is individual address: time to 92 * transmit next fragment plus 2 x ACK plus 3 x SIFS 93 * 94 * IEEE 802.11, 9.6: 95 * - control response frame (CTS or ACK) shall be transmitted using the 96 * same rate as the immediately previous frame in the frame exchange 97 * sequence, if this rate belongs to the PHY mandatory rates, or else 98 * at the highest possible rate belonging to the PHY rates in the 99 * BSSBasicRateSet 100 */ 101 hdr = (struct ieee80211_hdr *)skb->data; 102 if (ieee80211_is_ctl(hdr->frame_control)) { 103 /* TODO: These control frames are not currently sent by 104 * mac80211, but should they be implemented, this function 105 * needs to be updated to support duration field calculation. 106 * 107 * RTS: time needed to transmit pending data/mgmt frame plus 108 * one CTS frame plus one ACK frame plus 3 x SIFS 109 * CTS: duration of immediately previous RTS minus time 110 * required to transmit CTS and its SIFS 111 * ACK: 0 if immediately previous directed data/mgmt had 112 * more=0, with more=1 duration in ACK frame is duration 113 * from previous frame minus time needed to transmit ACK 114 * and its SIFS 115 * PS Poll: BIT(15) | BIT(14) | aid 116 */ 117 return 0; 118 } 119 120 /* data/mgmt */ 121 if (0 /* FIX: data/mgmt during CFP */) 122 return cpu_to_le16(32768); 123 124 if (group_addr) /* Group address as the destination - no ACK */ 125 return 0; 126 127 /* Individual destination address: 128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 129 * CTS and ACK frames shall be transmitted using the highest rate in 130 * basic rate set that is less than or equal to the rate of the 131 * immediately previous frame and that is using the same modulation 132 * (CCK or OFDM). If no basic rate set matches with these requirements, 133 * the highest mandatory rate of the PHY that is less than or equal to 134 * the rate of the previous frame is used. 135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 136 */ 137 rate = -1; 138 /* use lowest available if everything fails */ 139 mrate = sband->bitrates[0].bitrate; 140 for (i = 0; i < sband->n_bitrates; i++) { 141 struct ieee80211_rate *r = &sband->bitrates[i]; 142 143 if (r->bitrate > txrate->bitrate) 144 break; 145 146 if ((rate_flags & r->flags) != rate_flags) 147 continue; 148 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 151 152 switch (sband->band) { 153 case IEEE80211_BAND_2GHZ: { 154 u32 flag; 155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 156 flag = IEEE80211_RATE_MANDATORY_G; 157 else 158 flag = IEEE80211_RATE_MANDATORY_B; 159 if (r->flags & flag) 160 mrate = r->bitrate; 161 break; 162 } 163 case IEEE80211_BAND_5GHZ: 164 if (r->flags & IEEE80211_RATE_MANDATORY_A) 165 mrate = r->bitrate; 166 break; 167 case IEEE80211_BAND_60GHZ: 168 /* TODO, for now fall through */ 169 case IEEE80211_NUM_BANDS: 170 WARN_ON(1); 171 break; 172 } 173 } 174 if (rate == -1) { 175 /* No matching basic rate found; use highest suitable mandatory 176 * PHY rate */ 177 rate = DIV_ROUND_UP(mrate, 1 << shift); 178 } 179 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 181 if (ieee80211_is_data_qos(hdr->frame_control) && 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 183 dur = 0; 184 else 185 /* Time needed to transmit ACK 186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 187 * to closest integer */ 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 192 if (next_frag_len) { 193 /* Frame is fragmented: duration increases with time needed to 194 * transmit next fragment plus ACK and 2 x SIFS. */ 195 dur *= 2; /* ACK + SIFS */ 196 /* next fragment */ 197 dur += ieee80211_frame_duration(sband->band, next_frag_len, 198 txrate->bitrate, erp, 199 tx->sdata->vif.bss_conf.use_short_preamble, 200 shift); 201 } 202 203 return cpu_to_le16(dur); 204 } 205 206 /* tx handlers */ 207 static ieee80211_tx_result debug_noinline 208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 209 { 210 struct ieee80211_local *local = tx->local; 211 struct ieee80211_if_managed *ifmgd; 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 ifmgd = &tx->sdata->u.mgd; 241 242 /* 243 * Don't wakeup from power save if u-apsd is enabled, voip ac has 244 * u-apsd enabled and the frame is in voip class. This effectively 245 * means that even if all access categories have u-apsd enabled, in 246 * practise u-apsd is only used with the voip ac. This is a 247 * workaround for the case when received voip class packets do not 248 * have correct qos tag for some reason, due the network or the 249 * peer application. 250 * 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is 252 * changed via debugfs, user needs to reassociate manually to have 253 * everything in sync. 254 */ 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 258 return TX_CONTINUE; 259 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 261 ieee80211_stop_queues_by_reason(&local->hw, 262 IEEE80211_MAX_QUEUE_MAP, 263 IEEE80211_QUEUE_STOP_REASON_PS, 264 false); 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 266 ieee80211_queue_work(&local->hw, 267 &local->dynamic_ps_disable_work); 268 } 269 270 /* Don't restart the timer if we're not disassociated */ 271 if (!ifmgd->associated) 272 return TX_CONTINUE; 273 274 mod_timer(&local->dynamic_ps_timer, jiffies + 275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 276 277 return TX_CONTINUE; 278 } 279 280 static ieee80211_tx_result debug_noinline 281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 282 { 283 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 286 bool assoc = false; 287 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 289 return TX_CONTINUE; 290 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 293 !ieee80211_is_probe_req(hdr->frame_control) && 294 !ieee80211_is_nullfunc(hdr->frame_control)) 295 /* 296 * When software scanning only nullfunc frames (to notify 297 * the sleep state to the AP) and probe requests (for the 298 * active scan) are allowed, all other frames should not be 299 * sent and we should not get here, but if we do 300 * nonetheless, drop them to avoid sending them 301 * off-channel. See the link below and 302 * ieee80211_start_scan() for more. 303 * 304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 305 */ 306 return TX_DROP; 307 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 309 return TX_CONTINUE; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 332 ieee80211_is_data(hdr->frame_control) && 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 334 /* 335 * No associated STAs - no need to send multicast 336 * frames. 337 */ 338 return TX_DROP; 339 } 340 341 return TX_CONTINUE; 342 } 343 344 /* This function is called whenever the AP is about to exceed the maximum limit 345 * of buffered frames for power saving STAs. This situation should not really 346 * happen often during normal operation, so dropping the oldest buffered packet 347 * from each queue should be OK to make some room for new frames. */ 348 static void purge_old_ps_buffers(struct ieee80211_local *local) 349 { 350 int total = 0, purged = 0; 351 struct sk_buff *skb; 352 struct ieee80211_sub_if_data *sdata; 353 struct sta_info *sta; 354 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 356 struct ps_data *ps; 357 358 if (sdata->vif.type == NL80211_IFTYPE_AP) 359 ps = &sdata->u.ap.ps; 360 else if (ieee80211_vif_is_mesh(&sdata->vif)) 361 ps = &sdata->u.mesh.ps; 362 else 363 continue; 364 365 skb = skb_dequeue(&ps->bc_buf); 366 if (skb) { 367 purged++; 368 dev_kfree_skb(skb); 369 } 370 total += skb_queue_len(&ps->bc_buf); 371 } 372 373 /* 374 * Drop one frame from each station from the lowest-priority 375 * AC that has frames at all. 376 */ 377 list_for_each_entry_rcu(sta, &local->sta_list, list) { 378 int ac; 379 380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 381 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 382 total += skb_queue_len(&sta->ps_tx_buf[ac]); 383 if (skb) { 384 purged++; 385 ieee80211_free_txskb(&local->hw, skb); 386 break; 387 } 388 } 389 } 390 391 local->total_ps_buffered = total; 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 393 } 394 395 static ieee80211_tx_result 396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 397 { 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 400 struct ps_data *ps; 401 402 /* 403 * broadcast/multicast frame 404 * 405 * If any of the associated/peer stations is in power save mode, 406 * the frame is buffered to be sent after DTIM beacon frame. 407 * This is done either by the hardware or us. 408 */ 409 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 413 if (!tx->sdata->bss) 414 return TX_CONTINUE; 415 416 ps = &tx->sdata->bss->ps; 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 418 ps = &tx->sdata->u.mesh.ps; 419 } else { 420 return TX_CONTINUE; 421 } 422 423 424 /* no buffering for ordered frames */ 425 if (ieee80211_has_order(hdr->frame_control)) 426 return TX_CONTINUE; 427 428 if (ieee80211_is_probe_req(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 432 info->hw_queue = tx->sdata->vif.cab_queue; 433 434 /* no stations in PS mode */ 435 if (!atomic_read(&ps->num_sta_ps)) 436 return TX_CONTINUE; 437 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 439 440 /* device releases frame after DTIM beacon */ 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 442 return TX_CONTINUE; 443 444 /* buffered in mac80211 */ 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 446 purge_old_ps_buffers(tx->local); 447 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 449 ps_dbg(tx->sdata, 450 "BC TX buffer full - dropping the oldest frame\n"); 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 452 } else 453 tx->local->total_ps_buffered++; 454 455 skb_queue_tail(&ps->bc_buf, tx->skb); 456 457 return TX_QUEUED; 458 } 459 460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 461 struct sk_buff *skb) 462 { 463 if (!ieee80211_is_mgmt(fc)) 464 return 0; 465 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 467 return 0; 468 469 if (!ieee80211_is_robust_mgmt_frame(skb)) 470 return 0; 471 472 return 1; 473 } 474 475 static ieee80211_tx_result 476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 477 { 478 struct sta_info *sta = tx->sta; 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 481 struct ieee80211_local *local = tx->local; 482 483 if (unlikely(!sta)) 484 return TX_CONTINUE; 485 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 490 int ac = skb_get_queue_mapping(tx->skb); 491 492 if (ieee80211_is_mgmt(hdr->frame_control) && 493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 495 return TX_CONTINUE; 496 } 497 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 499 sta->sta.addr, sta->sta.aid, ac); 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 501 purge_old_ps_buffers(tx->local); 502 503 /* sync with ieee80211_sta_ps_deliver_wakeup */ 504 spin_lock(&sta->ps_lock); 505 /* 506 * STA woke up the meantime and all the frames on ps_tx_buf have 507 * been queued to pending queue. No reordering can happen, go 508 * ahead and Tx the packet. 509 */ 510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 513 spin_unlock(&sta->ps_lock); 514 return TX_CONTINUE; 515 } 516 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 519 ps_dbg(tx->sdata, 520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 521 sta->sta.addr, ac); 522 ieee80211_free_txskb(&local->hw, old); 523 } else 524 tx->local->total_ps_buffered++; 525 526 info->control.jiffies = jiffies; 527 info->control.vif = &tx->sdata->vif; 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 531 spin_unlock(&sta->ps_lock); 532 533 if (!timer_pending(&local->sta_cleanup)) 534 mod_timer(&local->sta_cleanup, 535 round_jiffies(jiffies + 536 STA_INFO_CLEANUP_INTERVAL)); 537 538 /* 539 * We queued up some frames, so the TIM bit might 540 * need to be set, recalculate it. 541 */ 542 sta_info_recalc_tim(sta); 543 544 return TX_QUEUED; 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 546 ps_dbg(tx->sdata, 547 "STA %pM in PS mode, but polling/in SP -> send frame\n", 548 sta->sta.addr); 549 } 550 551 return TX_CONTINUE; 552 } 553 554 static ieee80211_tx_result debug_noinline 555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 556 { 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 558 return TX_CONTINUE; 559 560 if (tx->flags & IEEE80211_TX_UNICAST) 561 return ieee80211_tx_h_unicast_ps_buf(tx); 562 else 563 return ieee80211_tx_h_multicast_ps_buf(tx); 564 } 565 566 static ieee80211_tx_result debug_noinline 567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 568 { 569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 570 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 572 if (tx->sdata->control_port_no_encrypt) 573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 576 } 577 578 return TX_CONTINUE; 579 } 580 581 static ieee80211_tx_result debug_noinline 582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 583 { 584 struct ieee80211_key *key; 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 587 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 589 tx->key = NULL; 590 else if (tx->sta && 591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 592 tx->key = key; 593 else if (ieee80211_is_mgmt(hdr->frame_control) && 594 is_multicast_ether_addr(hdr->addr1) && 595 ieee80211_is_robust_mgmt_frame(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 597 tx->key = key; 598 else if (is_multicast_ether_addr(hdr->addr1) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (!is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_unicast_key))) 603 tx->key = key; 604 else 605 tx->key = NULL; 606 607 if (tx->key) { 608 bool skip_hw = false; 609 610 /* TODO: add threshold stuff again */ 611 612 switch (tx->key->conf.cipher) { 613 case WLAN_CIPHER_SUITE_WEP40: 614 case WLAN_CIPHER_SUITE_WEP104: 615 case WLAN_CIPHER_SUITE_TKIP: 616 if (!ieee80211_is_data_present(hdr->frame_control)) 617 tx->key = NULL; 618 break; 619 case WLAN_CIPHER_SUITE_CCMP: 620 case WLAN_CIPHER_SUITE_CCMP_256: 621 case WLAN_CIPHER_SUITE_GCMP: 622 case WLAN_CIPHER_SUITE_GCMP_256: 623 if (!ieee80211_is_data_present(hdr->frame_control) && 624 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 625 tx->skb)) 626 tx->key = NULL; 627 else 628 skip_hw = (tx->key->conf.flags & 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 630 ieee80211_is_mgmt(hdr->frame_control); 631 break; 632 case WLAN_CIPHER_SUITE_AES_CMAC: 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 635 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 636 if (!ieee80211_is_mgmt(hdr->frame_control)) 637 tx->key = NULL; 638 break; 639 } 640 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 642 !ieee80211_is_deauth(hdr->frame_control))) 643 return TX_DROP; 644 645 if (!skip_hw && tx->key && 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 647 info->control.hw_key = &tx->key->conf; 648 } 649 650 return TX_CONTINUE; 651 } 652 653 static ieee80211_tx_result debug_noinline 654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 655 { 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 658 struct ieee80211_supported_band *sband; 659 u32 len; 660 struct ieee80211_tx_rate_control txrc; 661 struct ieee80211_sta_rates *ratetbl = NULL; 662 bool assoc = false; 663 664 memset(&txrc, 0, sizeof(txrc)); 665 666 sband = tx->local->hw.wiphy->bands[info->band]; 667 668 len = min_t(u32, tx->skb->len + FCS_LEN, 669 tx->local->hw.wiphy->frag_threshold); 670 671 /* set up the tx rate control struct we give the RC algo */ 672 txrc.hw = &tx->local->hw; 673 txrc.sband = sband; 674 txrc.bss_conf = &tx->sdata->vif.bss_conf; 675 txrc.skb = tx->skb; 676 txrc.reported_rate.idx = -1; 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 679 txrc.max_rate_idx = -1; 680 else 681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 682 683 if (tx->sdata->rc_has_mcs_mask[info->band]) 684 txrc.rate_idx_mcs_mask = 685 tx->sdata->rc_rateidx_mcs_mask[info->band]; 686 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 690 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 691 692 /* set up RTS protection if desired */ 693 if (len > tx->local->hw.wiphy->rts_threshold) { 694 txrc.rts = true; 695 } 696 697 info->control.use_rts = txrc.rts; 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 699 700 /* 701 * Use short preamble if the BSS can handle it, but not for 702 * management frames unless we know the receiver can handle 703 * that -- the management frame might be to a station that 704 * just wants a probe response. 705 */ 706 if (tx->sdata->vif.bss_conf.use_short_preamble && 707 (ieee80211_is_data(hdr->frame_control) || 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 709 txrc.short_preamble = true; 710 711 info->control.short_preamble = txrc.short_preamble; 712 713 /* don't ask rate control when rate already injected via radiotap */ 714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 715 return TX_CONTINUE; 716 717 if (tx->sta) 718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 719 720 /* 721 * Lets not bother rate control if we're associated and cannot 722 * talk to the sta. This should not happen. 723 */ 724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 725 !rate_usable_index_exists(sband, &tx->sta->sta), 726 "%s: Dropped data frame as no usable bitrate found while " 727 "scanning and associated. Target station: " 728 "%pM on %d GHz band\n", 729 tx->sdata->name, hdr->addr1, 730 info->band ? 5 : 2)) 731 return TX_DROP; 732 733 /* 734 * If we're associated with the sta at this point we know we can at 735 * least send the frame at the lowest bit rate. 736 */ 737 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 738 739 if (tx->sta && !info->control.skip_table) 740 ratetbl = rcu_dereference(tx->sta->sta.rates); 741 742 if (unlikely(info->control.rates[0].idx < 0)) { 743 if (ratetbl) { 744 struct ieee80211_tx_rate rate = { 745 .idx = ratetbl->rate[0].idx, 746 .flags = ratetbl->rate[0].flags, 747 .count = ratetbl->rate[0].count 748 }; 749 750 if (ratetbl->rate[0].idx < 0) 751 return TX_DROP; 752 753 tx->rate = rate; 754 } else { 755 return TX_DROP; 756 } 757 } else { 758 tx->rate = info->control.rates[0]; 759 } 760 761 if (txrc.reported_rate.idx < 0) { 762 txrc.reported_rate = tx->rate; 763 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 764 tx->sta->tx_stats.last_rate = txrc.reported_rate; 765 } else if (tx->sta) 766 tx->sta->tx_stats.last_rate = txrc.reported_rate; 767 768 if (ratetbl) 769 return TX_CONTINUE; 770 771 if (unlikely(!info->control.rates[0].count)) 772 info->control.rates[0].count = 1; 773 774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 775 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 776 info->control.rates[0].count = 1; 777 778 return TX_CONTINUE; 779 } 780 781 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 782 { 783 u16 *seq = &sta->tid_seq[tid]; 784 __le16 ret = cpu_to_le16(*seq); 785 786 /* Increase the sequence number. */ 787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 788 789 return ret; 790 } 791 792 static ieee80211_tx_result debug_noinline 793 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 794 { 795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 797 u8 *qc; 798 int tid; 799 800 /* 801 * Packet injection may want to control the sequence 802 * number, if we have no matching interface then we 803 * neither assign one ourselves nor ask the driver to. 804 */ 805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 806 return TX_CONTINUE; 807 808 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 809 return TX_CONTINUE; 810 811 if (ieee80211_hdrlen(hdr->frame_control) < 24) 812 return TX_CONTINUE; 813 814 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 815 return TX_CONTINUE; 816 817 /* 818 * Anything but QoS data that has a sequence number field 819 * (is long enough) gets a sequence number from the global 820 * counter. QoS data frames with a multicast destination 821 * also use the global counter (802.11-2012 9.3.2.10). 822 */ 823 if (!ieee80211_is_data_qos(hdr->frame_control) || 824 is_multicast_ether_addr(hdr->addr1)) { 825 /* driver should assign sequence number */ 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 827 /* for pure STA mode without beacons, we can do it */ 828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 829 tx->sdata->sequence_number += 0x10; 830 if (tx->sta) 831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 832 return TX_CONTINUE; 833 } 834 835 /* 836 * This should be true for injected/management frames only, for 837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 838 * above since they are not QoS-data frames. 839 */ 840 if (!tx->sta) 841 return TX_CONTINUE; 842 843 /* include per-STA, per-TID sequence counter */ 844 845 qc = ieee80211_get_qos_ctl(hdr); 846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 847 tx->sta->tx_stats.msdu[tid]++; 848 849 if (!tx->sta->sta.txq[0]) 850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 851 852 return TX_CONTINUE; 853 } 854 855 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 856 struct sk_buff *skb, int hdrlen, 857 int frag_threshold) 858 { 859 struct ieee80211_local *local = tx->local; 860 struct ieee80211_tx_info *info; 861 struct sk_buff *tmp; 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 863 int pos = hdrlen + per_fragm; 864 int rem = skb->len - hdrlen - per_fragm; 865 866 if (WARN_ON(rem < 0)) 867 return -EINVAL; 868 869 /* first fragment was already added to queue by caller */ 870 871 while (rem) { 872 int fraglen = per_fragm; 873 874 if (fraglen > rem) 875 fraglen = rem; 876 rem -= fraglen; 877 tmp = dev_alloc_skb(local->tx_headroom + 878 frag_threshold + 879 tx->sdata->encrypt_headroom + 880 IEEE80211_ENCRYPT_TAILROOM); 881 if (!tmp) 882 return -ENOMEM; 883 884 __skb_queue_tail(&tx->skbs, tmp); 885 886 skb_reserve(tmp, 887 local->tx_headroom + tx->sdata->encrypt_headroom); 888 889 /* copy control information */ 890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 891 892 info = IEEE80211_SKB_CB(tmp); 893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 894 IEEE80211_TX_CTL_FIRST_FRAGMENT); 895 896 if (rem) 897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 898 899 skb_copy_queue_mapping(tmp, skb); 900 tmp->priority = skb->priority; 901 tmp->dev = skb->dev; 902 903 /* copy header and data */ 904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 906 907 pos += fraglen; 908 } 909 910 /* adjust first fragment's length */ 911 skb_trim(skb, hdrlen + per_fragm); 912 return 0; 913 } 914 915 static ieee80211_tx_result debug_noinline 916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 917 { 918 struct sk_buff *skb = tx->skb; 919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 920 struct ieee80211_hdr *hdr = (void *)skb->data; 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 922 int hdrlen; 923 int fragnum; 924 925 /* no matter what happens, tx->skb moves to tx->skbs */ 926 __skb_queue_tail(&tx->skbs, skb); 927 tx->skb = NULL; 928 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 930 return TX_CONTINUE; 931 932 if (tx->local->ops->set_frag_threshold) 933 return TX_CONTINUE; 934 935 /* 936 * Warn when submitting a fragmented A-MPDU frame and drop it. 937 * This scenario is handled in ieee80211_tx_prepare but extra 938 * caution taken here as fragmented ampdu may cause Tx stop. 939 */ 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 941 return TX_DROP; 942 943 hdrlen = ieee80211_hdrlen(hdr->frame_control); 944 945 /* internal error, why isn't DONTFRAG set? */ 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 947 return TX_DROP; 948 949 /* 950 * Now fragment the frame. This will allocate all the fragments and 951 * chain them (using skb as the first fragment) to skb->next. 952 * During transmission, we will remove the successfully transmitted 953 * fragments from this list. When the low-level driver rejects one 954 * of the fragments then we will simply pretend to accept the skb 955 * but store it away as pending. 956 */ 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 958 return TX_DROP; 959 960 /* update duration/seq/flags of fragments */ 961 fragnum = 0; 962 963 skb_queue_walk(&tx->skbs, skb) { 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 965 966 hdr = (void *)skb->data; 967 info = IEEE80211_SKB_CB(skb); 968 969 if (!skb_queue_is_last(&tx->skbs, skb)) { 970 hdr->frame_control |= morefrags; 971 /* 972 * No multi-rate retries for fragmented frames, that 973 * would completely throw off the NAV at other STAs. 974 */ 975 info->control.rates[1].idx = -1; 976 info->control.rates[2].idx = -1; 977 info->control.rates[3].idx = -1; 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 980 } else { 981 hdr->frame_control &= ~morefrags; 982 } 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 984 fragnum++; 985 } 986 987 return TX_CONTINUE; 988 } 989 990 static ieee80211_tx_result debug_noinline 991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 992 { 993 struct sk_buff *skb; 994 int ac = -1; 995 996 if (!tx->sta) 997 return TX_CONTINUE; 998 999 skb_queue_walk(&tx->skbs, skb) { 1000 ac = skb_get_queue_mapping(skb); 1001 tx->sta->tx_stats.bytes[ac] += skb->len; 1002 } 1003 if (ac >= 0) 1004 tx->sta->tx_stats.packets[ac]++; 1005 1006 return TX_CONTINUE; 1007 } 1008 1009 static ieee80211_tx_result debug_noinline 1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1011 { 1012 if (!tx->key) 1013 return TX_CONTINUE; 1014 1015 switch (tx->key->conf.cipher) { 1016 case WLAN_CIPHER_SUITE_WEP40: 1017 case WLAN_CIPHER_SUITE_WEP104: 1018 return ieee80211_crypto_wep_encrypt(tx); 1019 case WLAN_CIPHER_SUITE_TKIP: 1020 return ieee80211_crypto_tkip_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_CCMP: 1022 return ieee80211_crypto_ccmp_encrypt( 1023 tx, IEEE80211_CCMP_MIC_LEN); 1024 case WLAN_CIPHER_SUITE_CCMP_256: 1025 return ieee80211_crypto_ccmp_encrypt( 1026 tx, IEEE80211_CCMP_256_MIC_LEN); 1027 case WLAN_CIPHER_SUITE_AES_CMAC: 1028 return ieee80211_crypto_aes_cmac_encrypt(tx); 1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1033 return ieee80211_crypto_aes_gmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_GCMP: 1035 case WLAN_CIPHER_SUITE_GCMP_256: 1036 return ieee80211_crypto_gcmp_encrypt(tx); 1037 default: 1038 return ieee80211_crypto_hw_encrypt(tx); 1039 } 1040 1041 return TX_DROP; 1042 } 1043 1044 static ieee80211_tx_result debug_noinline 1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1046 { 1047 struct sk_buff *skb; 1048 struct ieee80211_hdr *hdr; 1049 int next_len; 1050 bool group_addr; 1051 1052 skb_queue_walk(&tx->skbs, skb) { 1053 hdr = (void *) skb->data; 1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1055 break; /* must not overwrite AID */ 1056 if (!skb_queue_is_last(&tx->skbs, skb)) { 1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1058 next_len = next->len; 1059 } else 1060 next_len = 0; 1061 group_addr = is_multicast_ether_addr(hdr->addr1); 1062 1063 hdr->duration_id = 1064 ieee80211_duration(tx, skb, group_addr, next_len); 1065 } 1066 1067 return TX_CONTINUE; 1068 } 1069 1070 /* actual transmit path */ 1071 1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1073 struct sk_buff *skb, 1074 struct ieee80211_tx_info *info, 1075 struct tid_ampdu_tx *tid_tx, 1076 int tid) 1077 { 1078 bool queued = false; 1079 bool reset_agg_timer = false; 1080 struct sk_buff *purge_skb = NULL; 1081 1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1083 info->flags |= IEEE80211_TX_CTL_AMPDU; 1084 reset_agg_timer = true; 1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1086 /* 1087 * nothing -- this aggregation session is being started 1088 * but that might still fail with the driver 1089 */ 1090 } else if (!tx->sta->sta.txq[tid]) { 1091 spin_lock(&tx->sta->lock); 1092 /* 1093 * Need to re-check now, because we may get here 1094 * 1095 * 1) in the window during which the setup is actually 1096 * already done, but not marked yet because not all 1097 * packets are spliced over to the driver pending 1098 * queue yet -- if this happened we acquire the lock 1099 * either before or after the splice happens, but 1100 * need to recheck which of these cases happened. 1101 * 1102 * 2) during session teardown, if the OPERATIONAL bit 1103 * was cleared due to the teardown but the pointer 1104 * hasn't been assigned NULL yet (or we loaded it 1105 * before it was assigned) -- in this case it may 1106 * now be NULL which means we should just let the 1107 * packet pass through because splicing the frames 1108 * back is already done. 1109 */ 1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1111 1112 if (!tid_tx) { 1113 /* do nothing, let packet pass through */ 1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1115 info->flags |= IEEE80211_TX_CTL_AMPDU; 1116 reset_agg_timer = true; 1117 } else { 1118 queued = true; 1119 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1120 clear_sta_flag(tx->sta, WLAN_STA_SP); 1121 ps_dbg(tx->sta->sdata, 1122 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1123 tx->sta->sta.addr, tx->sta->sta.aid); 1124 } 1125 info->control.vif = &tx->sdata->vif; 1126 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1127 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1128 __skb_queue_tail(&tid_tx->pending, skb); 1129 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1130 purge_skb = __skb_dequeue(&tid_tx->pending); 1131 } 1132 spin_unlock(&tx->sta->lock); 1133 1134 if (purge_skb) 1135 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1136 } 1137 1138 /* reset session timer */ 1139 if (reset_agg_timer && tid_tx->timeout) 1140 tid_tx->last_tx = jiffies; 1141 1142 return queued; 1143 } 1144 1145 /* 1146 * initialises @tx 1147 * pass %NULL for the station if unknown, a valid pointer if known 1148 * or an ERR_PTR() if the station is known not to exist 1149 */ 1150 static ieee80211_tx_result 1151 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1152 struct ieee80211_tx_data *tx, 1153 struct sta_info *sta, struct sk_buff *skb) 1154 { 1155 struct ieee80211_local *local = sdata->local; 1156 struct ieee80211_hdr *hdr; 1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1158 int tid; 1159 u8 *qc; 1160 1161 memset(tx, 0, sizeof(*tx)); 1162 tx->skb = skb; 1163 tx->local = local; 1164 tx->sdata = sdata; 1165 __skb_queue_head_init(&tx->skbs); 1166 1167 /* 1168 * If this flag is set to true anywhere, and we get here, 1169 * we are doing the needed processing, so remove the flag 1170 * now. 1171 */ 1172 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1173 1174 hdr = (struct ieee80211_hdr *) skb->data; 1175 1176 if (likely(sta)) { 1177 if (!IS_ERR(sta)) 1178 tx->sta = sta; 1179 } else { 1180 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1181 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1182 if (!tx->sta && sdata->wdev.use_4addr) 1183 return TX_DROP; 1184 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1185 IEEE80211_TX_CTL_INJECTED) || 1186 tx->sdata->control_port_protocol == tx->skb->protocol) { 1187 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1188 } 1189 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1190 tx->sta = sta_info_get(sdata, hdr->addr1); 1191 } 1192 1193 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1194 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1195 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1196 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1197 struct tid_ampdu_tx *tid_tx; 1198 1199 qc = ieee80211_get_qos_ctl(hdr); 1200 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1201 1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1203 if (tid_tx) { 1204 bool queued; 1205 1206 queued = ieee80211_tx_prep_agg(tx, skb, info, 1207 tid_tx, tid); 1208 1209 if (unlikely(queued)) 1210 return TX_QUEUED; 1211 } 1212 } 1213 1214 if (is_multicast_ether_addr(hdr->addr1)) { 1215 tx->flags &= ~IEEE80211_TX_UNICAST; 1216 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1217 } else 1218 tx->flags |= IEEE80211_TX_UNICAST; 1219 1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1221 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1223 info->flags & IEEE80211_TX_CTL_AMPDU) 1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1225 } 1226 1227 if (!tx->sta) 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1231 ieee80211_check_fast_xmit(tx->sta); 1232 } 1233 1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1235 1236 return TX_CONTINUE; 1237 } 1238 1239 static void ieee80211_drv_tx(struct ieee80211_local *local, 1240 struct ieee80211_vif *vif, 1241 struct ieee80211_sta *pubsta, 1242 struct sk_buff *skb) 1243 { 1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1245 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1247 struct ieee80211_tx_control control = { 1248 .sta = pubsta, 1249 }; 1250 struct ieee80211_txq *txq = NULL; 1251 struct txq_info *txqi; 1252 u8 ac; 1253 1254 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1255 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1256 goto tx_normal; 1257 1258 if (!ieee80211_is_data(hdr->frame_control)) 1259 goto tx_normal; 1260 1261 if (pubsta) { 1262 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1263 1264 txq = pubsta->txq[tid]; 1265 } else if (vif) { 1266 txq = vif->txq; 1267 } 1268 1269 if (!txq) 1270 goto tx_normal; 1271 1272 ac = txq->ac; 1273 txqi = to_txq_info(txq); 1274 atomic_inc(&sdata->txqs_len[ac]); 1275 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending) 1276 netif_stop_subqueue(sdata->dev, ac); 1277 1278 spin_lock_bh(&txqi->queue.lock); 1279 txqi->byte_cnt += skb->len; 1280 __skb_queue_tail(&txqi->queue, skb); 1281 spin_unlock_bh(&txqi->queue.lock); 1282 1283 drv_wake_tx_queue(local, txqi); 1284 1285 return; 1286 1287 tx_normal: 1288 drv_tx(local, &control, skb); 1289 } 1290 1291 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1292 struct ieee80211_txq *txq) 1293 { 1294 struct ieee80211_local *local = hw_to_local(hw); 1295 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif); 1296 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1297 struct ieee80211_hdr *hdr; 1298 struct sk_buff *skb = NULL; 1299 u8 ac = txq->ac; 1300 1301 spin_lock_bh(&txqi->queue.lock); 1302 1303 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1304 goto out; 1305 1306 skb = __skb_dequeue(&txqi->queue); 1307 if (!skb) 1308 goto out; 1309 1310 txqi->byte_cnt -= skb->len; 1311 1312 atomic_dec(&sdata->txqs_len[ac]); 1313 if (__netif_subqueue_stopped(sdata->dev, ac)) 1314 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]); 1315 1316 hdr = (struct ieee80211_hdr *)skb->data; 1317 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1318 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1319 sta); 1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1321 1322 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1323 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1324 info->flags |= IEEE80211_TX_CTL_AMPDU; 1325 else 1326 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1327 } 1328 1329 out: 1330 spin_unlock_bh(&txqi->queue.lock); 1331 1332 return skb; 1333 } 1334 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1335 1336 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1337 struct ieee80211_vif *vif, 1338 struct ieee80211_sta *sta, 1339 struct sk_buff_head *skbs, 1340 bool txpending) 1341 { 1342 struct sk_buff *skb, *tmp; 1343 unsigned long flags; 1344 1345 skb_queue_walk_safe(skbs, skb, tmp) { 1346 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1347 int q = info->hw_queue; 1348 1349 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1350 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1351 __skb_unlink(skb, skbs); 1352 ieee80211_free_txskb(&local->hw, skb); 1353 continue; 1354 } 1355 #endif 1356 1357 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1358 if (local->queue_stop_reasons[q] || 1359 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1360 if (unlikely(info->flags & 1361 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1362 if (local->queue_stop_reasons[q] & 1363 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1364 /* 1365 * Drop off-channel frames if queues 1366 * are stopped for any reason other 1367 * than off-channel operation. Never 1368 * queue them. 1369 */ 1370 spin_unlock_irqrestore( 1371 &local->queue_stop_reason_lock, 1372 flags); 1373 ieee80211_purge_tx_queue(&local->hw, 1374 skbs); 1375 return true; 1376 } 1377 } else { 1378 1379 /* 1380 * Since queue is stopped, queue up frames for 1381 * later transmission from the tx-pending 1382 * tasklet when the queue is woken again. 1383 */ 1384 if (txpending) 1385 skb_queue_splice_init(skbs, 1386 &local->pending[q]); 1387 else 1388 skb_queue_splice_tail_init(skbs, 1389 &local->pending[q]); 1390 1391 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1392 flags); 1393 return false; 1394 } 1395 } 1396 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1397 1398 info->control.vif = vif; 1399 1400 __skb_unlink(skb, skbs); 1401 ieee80211_drv_tx(local, vif, sta, skb); 1402 } 1403 1404 return true; 1405 } 1406 1407 /* 1408 * Returns false if the frame couldn't be transmitted but was queued instead. 1409 */ 1410 static bool __ieee80211_tx(struct ieee80211_local *local, 1411 struct sk_buff_head *skbs, int led_len, 1412 struct sta_info *sta, bool txpending) 1413 { 1414 struct ieee80211_tx_info *info; 1415 struct ieee80211_sub_if_data *sdata; 1416 struct ieee80211_vif *vif; 1417 struct ieee80211_sta *pubsta; 1418 struct sk_buff *skb; 1419 bool result = true; 1420 __le16 fc; 1421 1422 if (WARN_ON(skb_queue_empty(skbs))) 1423 return true; 1424 1425 skb = skb_peek(skbs); 1426 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1427 info = IEEE80211_SKB_CB(skb); 1428 sdata = vif_to_sdata(info->control.vif); 1429 if (sta && !sta->uploaded) 1430 sta = NULL; 1431 1432 if (sta) 1433 pubsta = &sta->sta; 1434 else 1435 pubsta = NULL; 1436 1437 switch (sdata->vif.type) { 1438 case NL80211_IFTYPE_MONITOR: 1439 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1440 vif = &sdata->vif; 1441 break; 1442 } 1443 sdata = rcu_dereference(local->monitor_sdata); 1444 if (sdata) { 1445 vif = &sdata->vif; 1446 info->hw_queue = 1447 vif->hw_queue[skb_get_queue_mapping(skb)]; 1448 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1449 ieee80211_purge_tx_queue(&local->hw, skbs); 1450 return true; 1451 } else 1452 vif = NULL; 1453 break; 1454 case NL80211_IFTYPE_AP_VLAN: 1455 sdata = container_of(sdata->bss, 1456 struct ieee80211_sub_if_data, u.ap); 1457 /* fall through */ 1458 default: 1459 vif = &sdata->vif; 1460 break; 1461 } 1462 1463 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1464 txpending); 1465 1466 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1467 1468 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1469 1470 return result; 1471 } 1472 1473 /* 1474 * Invoke TX handlers, return 0 on success and non-zero if the 1475 * frame was dropped or queued. 1476 */ 1477 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1478 { 1479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1480 ieee80211_tx_result res = TX_DROP; 1481 1482 #define CALL_TXH(txh) \ 1483 do { \ 1484 res = txh(tx); \ 1485 if (res != TX_CONTINUE) \ 1486 goto txh_done; \ 1487 } while (0) 1488 1489 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1490 CALL_TXH(ieee80211_tx_h_check_assoc); 1491 CALL_TXH(ieee80211_tx_h_ps_buf); 1492 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1493 CALL_TXH(ieee80211_tx_h_select_key); 1494 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1495 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1496 1497 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1498 __skb_queue_tail(&tx->skbs, tx->skb); 1499 tx->skb = NULL; 1500 goto txh_done; 1501 } 1502 1503 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1504 CALL_TXH(ieee80211_tx_h_sequence); 1505 CALL_TXH(ieee80211_tx_h_fragment); 1506 /* handlers after fragment must be aware of tx info fragmentation! */ 1507 CALL_TXH(ieee80211_tx_h_stats); 1508 CALL_TXH(ieee80211_tx_h_encrypt); 1509 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1510 CALL_TXH(ieee80211_tx_h_calculate_duration); 1511 #undef CALL_TXH 1512 1513 txh_done: 1514 if (unlikely(res == TX_DROP)) { 1515 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1516 if (tx->skb) 1517 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1518 else 1519 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1520 return -1; 1521 } else if (unlikely(res == TX_QUEUED)) { 1522 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1523 return -1; 1524 } 1525 1526 return 0; 1527 } 1528 1529 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1530 struct ieee80211_vif *vif, struct sk_buff *skb, 1531 int band, struct ieee80211_sta **sta) 1532 { 1533 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1534 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1535 struct ieee80211_tx_data tx; 1536 struct sk_buff *skb2; 1537 1538 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1539 return false; 1540 1541 info->band = band; 1542 info->control.vif = vif; 1543 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1544 1545 if (invoke_tx_handlers(&tx)) 1546 return false; 1547 1548 if (sta) { 1549 if (tx.sta) 1550 *sta = &tx.sta->sta; 1551 else 1552 *sta = NULL; 1553 } 1554 1555 /* this function isn't suitable for fragmented data frames */ 1556 skb2 = __skb_dequeue(&tx.skbs); 1557 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1558 ieee80211_free_txskb(hw, skb2); 1559 ieee80211_purge_tx_queue(hw, &tx.skbs); 1560 return false; 1561 } 1562 1563 return true; 1564 } 1565 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1566 1567 /* 1568 * Returns false if the frame couldn't be transmitted but was queued instead. 1569 */ 1570 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1571 struct sta_info *sta, struct sk_buff *skb, 1572 bool txpending) 1573 { 1574 struct ieee80211_local *local = sdata->local; 1575 struct ieee80211_tx_data tx; 1576 ieee80211_tx_result res_prepare; 1577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1578 bool result = true; 1579 int led_len; 1580 1581 if (unlikely(skb->len < 10)) { 1582 dev_kfree_skb(skb); 1583 return true; 1584 } 1585 1586 /* initialises tx */ 1587 led_len = skb->len; 1588 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1589 1590 if (unlikely(res_prepare == TX_DROP)) { 1591 ieee80211_free_txskb(&local->hw, skb); 1592 return true; 1593 } else if (unlikely(res_prepare == TX_QUEUED)) { 1594 return true; 1595 } 1596 1597 /* set up hw_queue value early */ 1598 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1599 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1600 info->hw_queue = 1601 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1602 1603 if (!invoke_tx_handlers(&tx)) 1604 result = __ieee80211_tx(local, &tx.skbs, led_len, 1605 tx.sta, txpending); 1606 1607 return result; 1608 } 1609 1610 /* device xmit handlers */ 1611 1612 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1613 struct sk_buff *skb, 1614 int head_need, bool may_encrypt) 1615 { 1616 struct ieee80211_local *local = sdata->local; 1617 int tail_need = 0; 1618 1619 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1620 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1621 tail_need -= skb_tailroom(skb); 1622 tail_need = max_t(int, tail_need, 0); 1623 } 1624 1625 if (skb_cloned(skb) && 1626 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1627 !skb_clone_writable(skb, ETH_HLEN) || 1628 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1629 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1630 else if (head_need || tail_need) 1631 I802_DEBUG_INC(local->tx_expand_skb_head); 1632 else 1633 return 0; 1634 1635 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1636 wiphy_debug(local->hw.wiphy, 1637 "failed to reallocate TX buffer\n"); 1638 return -ENOMEM; 1639 } 1640 1641 return 0; 1642 } 1643 1644 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1645 struct sta_info *sta, struct sk_buff *skb) 1646 { 1647 struct ieee80211_local *local = sdata->local; 1648 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1649 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1650 int headroom; 1651 bool may_encrypt; 1652 1653 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1654 1655 headroom = local->tx_headroom; 1656 if (may_encrypt) 1657 headroom += sdata->encrypt_headroom; 1658 headroom -= skb_headroom(skb); 1659 headroom = max_t(int, 0, headroom); 1660 1661 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1662 ieee80211_free_txskb(&local->hw, skb); 1663 return; 1664 } 1665 1666 hdr = (struct ieee80211_hdr *) skb->data; 1667 info->control.vif = &sdata->vif; 1668 1669 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1670 if (ieee80211_is_data(hdr->frame_control) && 1671 is_unicast_ether_addr(hdr->addr1)) { 1672 if (mesh_nexthop_resolve(sdata, skb)) 1673 return; /* skb queued: don't free */ 1674 } else { 1675 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1676 } 1677 } 1678 1679 ieee80211_set_qos_hdr(sdata, skb); 1680 ieee80211_tx(sdata, sta, skb, false); 1681 } 1682 1683 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1684 struct sk_buff *skb) 1685 { 1686 struct ieee80211_radiotap_iterator iterator; 1687 struct ieee80211_radiotap_header *rthdr = 1688 (struct ieee80211_radiotap_header *) skb->data; 1689 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1690 struct ieee80211_supported_band *sband = 1691 local->hw.wiphy->bands[info->band]; 1692 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1693 NULL); 1694 u16 txflags; 1695 u16 rate = 0; 1696 bool rate_found = false; 1697 u8 rate_retries = 0; 1698 u16 rate_flags = 0; 1699 u8 mcs_known, mcs_flags; 1700 int i; 1701 1702 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1703 IEEE80211_TX_CTL_DONTFRAG; 1704 1705 /* 1706 * for every radiotap entry that is present 1707 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1708 * entries present, or -EINVAL on error) 1709 */ 1710 1711 while (!ret) { 1712 ret = ieee80211_radiotap_iterator_next(&iterator); 1713 1714 if (ret) 1715 continue; 1716 1717 /* see if this argument is something we can use */ 1718 switch (iterator.this_arg_index) { 1719 /* 1720 * You must take care when dereferencing iterator.this_arg 1721 * for multibyte types... the pointer is not aligned. Use 1722 * get_unaligned((type *)iterator.this_arg) to dereference 1723 * iterator.this_arg for type "type" safely on all arches. 1724 */ 1725 case IEEE80211_RADIOTAP_FLAGS: 1726 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1727 /* 1728 * this indicates that the skb we have been 1729 * handed has the 32-bit FCS CRC at the end... 1730 * we should react to that by snipping it off 1731 * because it will be recomputed and added 1732 * on transmission 1733 */ 1734 if (skb->len < (iterator._max_length + FCS_LEN)) 1735 return false; 1736 1737 skb_trim(skb, skb->len - FCS_LEN); 1738 } 1739 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1740 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1741 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1742 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1743 break; 1744 1745 case IEEE80211_RADIOTAP_TX_FLAGS: 1746 txflags = get_unaligned_le16(iterator.this_arg); 1747 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1748 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1749 break; 1750 1751 case IEEE80211_RADIOTAP_RATE: 1752 rate = *iterator.this_arg; 1753 rate_flags = 0; 1754 rate_found = true; 1755 break; 1756 1757 case IEEE80211_RADIOTAP_DATA_RETRIES: 1758 rate_retries = *iterator.this_arg; 1759 break; 1760 1761 case IEEE80211_RADIOTAP_MCS: 1762 mcs_known = iterator.this_arg[0]; 1763 mcs_flags = iterator.this_arg[1]; 1764 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 1765 break; 1766 1767 rate_found = true; 1768 rate = iterator.this_arg[2]; 1769 rate_flags = IEEE80211_TX_RC_MCS; 1770 1771 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 1772 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 1773 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1774 1775 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 1776 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40) 1777 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 1778 break; 1779 1780 /* 1781 * Please update the file 1782 * Documentation/networking/mac80211-injection.txt 1783 * when parsing new fields here. 1784 */ 1785 1786 default: 1787 break; 1788 } 1789 } 1790 1791 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1792 return false; 1793 1794 if (rate_found) { 1795 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 1796 1797 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 1798 info->control.rates[i].idx = -1; 1799 info->control.rates[i].flags = 0; 1800 info->control.rates[i].count = 0; 1801 } 1802 1803 if (rate_flags & IEEE80211_TX_RC_MCS) { 1804 info->control.rates[0].idx = rate; 1805 } else { 1806 for (i = 0; i < sband->n_bitrates; i++) { 1807 if (rate * 5 != sband->bitrates[i].bitrate) 1808 continue; 1809 1810 info->control.rates[0].idx = i; 1811 break; 1812 } 1813 } 1814 1815 info->control.rates[0].flags = rate_flags; 1816 info->control.rates[0].count = min_t(u8, rate_retries + 1, 1817 local->hw.max_rate_tries); 1818 } 1819 1820 /* 1821 * remove the radiotap header 1822 * iterator->_max_length was sanity-checked against 1823 * skb->len by iterator init 1824 */ 1825 skb_pull(skb, iterator._max_length); 1826 1827 return true; 1828 } 1829 1830 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1831 struct net_device *dev) 1832 { 1833 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1834 struct ieee80211_chanctx_conf *chanctx_conf; 1835 struct ieee80211_radiotap_header *prthdr = 1836 (struct ieee80211_radiotap_header *)skb->data; 1837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1838 struct ieee80211_hdr *hdr; 1839 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1840 struct cfg80211_chan_def *chandef; 1841 u16 len_rthdr; 1842 int hdrlen; 1843 1844 /* check for not even having the fixed radiotap header part */ 1845 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1846 goto fail; /* too short to be possibly valid */ 1847 1848 /* is it a header version we can trust to find length from? */ 1849 if (unlikely(prthdr->it_version)) 1850 goto fail; /* only version 0 is supported */ 1851 1852 /* then there must be a radiotap header with a length we can use */ 1853 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1854 1855 /* does the skb contain enough to deliver on the alleged length? */ 1856 if (unlikely(skb->len < len_rthdr)) 1857 goto fail; /* skb too short for claimed rt header extent */ 1858 1859 /* 1860 * fix up the pointers accounting for the radiotap 1861 * header still being in there. We are being given 1862 * a precooked IEEE80211 header so no need for 1863 * normal processing 1864 */ 1865 skb_set_mac_header(skb, len_rthdr); 1866 /* 1867 * these are just fixed to the end of the rt area since we 1868 * don't have any better information and at this point, nobody cares 1869 */ 1870 skb_set_network_header(skb, len_rthdr); 1871 skb_set_transport_header(skb, len_rthdr); 1872 1873 if (skb->len < len_rthdr + 2) 1874 goto fail; 1875 1876 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1877 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1878 1879 if (skb->len < len_rthdr + hdrlen) 1880 goto fail; 1881 1882 /* 1883 * Initialize skb->protocol if the injected frame is a data frame 1884 * carrying a rfc1042 header 1885 */ 1886 if (ieee80211_is_data(hdr->frame_control) && 1887 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1888 u8 *payload = (u8 *)hdr + hdrlen; 1889 1890 if (ether_addr_equal(payload, rfc1042_header)) 1891 skb->protocol = cpu_to_be16((payload[6] << 8) | 1892 payload[7]); 1893 } 1894 1895 memset(info, 0, sizeof(*info)); 1896 1897 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1898 IEEE80211_TX_CTL_INJECTED; 1899 1900 rcu_read_lock(); 1901 1902 /* 1903 * We process outgoing injected frames that have a local address 1904 * we handle as though they are non-injected frames. 1905 * This code here isn't entirely correct, the local MAC address 1906 * isn't always enough to find the interface to use; for proper 1907 * VLAN/WDS support we will need a different mechanism (which 1908 * likely isn't going to be monitor interfaces). 1909 */ 1910 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1911 1912 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1913 if (!ieee80211_sdata_running(tmp_sdata)) 1914 continue; 1915 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1916 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1917 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1918 continue; 1919 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1920 sdata = tmp_sdata; 1921 break; 1922 } 1923 } 1924 1925 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1926 if (!chanctx_conf) { 1927 tmp_sdata = rcu_dereference(local->monitor_sdata); 1928 if (tmp_sdata) 1929 chanctx_conf = 1930 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1931 } 1932 1933 if (chanctx_conf) 1934 chandef = &chanctx_conf->def; 1935 else if (!local->use_chanctx) 1936 chandef = &local->_oper_chandef; 1937 else 1938 goto fail_rcu; 1939 1940 /* 1941 * Frame injection is not allowed if beaconing is not allowed 1942 * or if we need radar detection. Beaconing is usually not allowed when 1943 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1944 * Passive scan is also used in world regulatory domains where 1945 * your country is not known and as such it should be treated as 1946 * NO TX unless the channel is explicitly allowed in which case 1947 * your current regulatory domain would not have the passive scan 1948 * flag. 1949 * 1950 * Since AP mode uses monitor interfaces to inject/TX management 1951 * frames we can make AP mode the exception to this rule once it 1952 * supports radar detection as its implementation can deal with 1953 * radar detection by itself. We can do that later by adding a 1954 * monitor flag interfaces used for AP support. 1955 */ 1956 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1957 sdata->vif.type)) 1958 goto fail_rcu; 1959 1960 info->band = chandef->chan->band; 1961 1962 /* process and remove the injection radiotap header */ 1963 if (!ieee80211_parse_tx_radiotap(local, skb)) 1964 goto fail_rcu; 1965 1966 ieee80211_xmit(sdata, NULL, skb); 1967 rcu_read_unlock(); 1968 1969 return NETDEV_TX_OK; 1970 1971 fail_rcu: 1972 rcu_read_unlock(); 1973 fail: 1974 dev_kfree_skb(skb); 1975 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1976 } 1977 1978 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 1979 { 1980 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 1981 1982 return ethertype == ETH_P_TDLS && 1983 skb->len > 14 && 1984 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1985 } 1986 1987 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 1988 struct sk_buff *skb, 1989 struct sta_info **sta_out) 1990 { 1991 struct sta_info *sta; 1992 1993 switch (sdata->vif.type) { 1994 case NL80211_IFTYPE_AP_VLAN: 1995 sta = rcu_dereference(sdata->u.vlan.sta); 1996 if (sta) { 1997 *sta_out = sta; 1998 return 0; 1999 } else if (sdata->wdev.use_4addr) { 2000 return -ENOLINK; 2001 } 2002 /* fall through */ 2003 case NL80211_IFTYPE_AP: 2004 case NL80211_IFTYPE_OCB: 2005 case NL80211_IFTYPE_ADHOC: 2006 if (is_multicast_ether_addr(skb->data)) { 2007 *sta_out = ERR_PTR(-ENOENT); 2008 return 0; 2009 } 2010 sta = sta_info_get_bss(sdata, skb->data); 2011 break; 2012 case NL80211_IFTYPE_WDS: 2013 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2014 break; 2015 #ifdef CONFIG_MAC80211_MESH 2016 case NL80211_IFTYPE_MESH_POINT: 2017 /* determined much later */ 2018 *sta_out = NULL; 2019 return 0; 2020 #endif 2021 case NL80211_IFTYPE_STATION: 2022 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2023 sta = sta_info_get(sdata, skb->data); 2024 if (sta) { 2025 bool tdls_peer, tdls_auth; 2026 2027 tdls_peer = test_sta_flag(sta, 2028 WLAN_STA_TDLS_PEER); 2029 tdls_auth = test_sta_flag(sta, 2030 WLAN_STA_TDLS_PEER_AUTH); 2031 2032 if (tdls_peer && tdls_auth) { 2033 *sta_out = sta; 2034 return 0; 2035 } 2036 2037 /* 2038 * TDLS link during setup - throw out frames to 2039 * peer. Allow TDLS-setup frames to unauthorized 2040 * peers for the special case of a link teardown 2041 * after a TDLS sta is removed due to being 2042 * unreachable. 2043 */ 2044 if (tdls_peer && !tdls_auth && 2045 !ieee80211_is_tdls_setup(skb)) 2046 return -EINVAL; 2047 } 2048 2049 } 2050 2051 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2052 if (!sta) 2053 return -ENOLINK; 2054 break; 2055 default: 2056 return -EINVAL; 2057 } 2058 2059 *sta_out = sta ?: ERR_PTR(-ENOENT); 2060 return 0; 2061 } 2062 2063 /** 2064 * ieee80211_build_hdr - build 802.11 header in the given frame 2065 * @sdata: virtual interface to build the header for 2066 * @skb: the skb to build the header in 2067 * @info_flags: skb flags to set 2068 * 2069 * This function takes the skb with 802.3 header and reformats the header to 2070 * the appropriate IEEE 802.11 header based on which interface the packet is 2071 * being transmitted on. 2072 * 2073 * Note that this function also takes care of the TX status request and 2074 * potential unsharing of the SKB - this needs to be interleaved with the 2075 * header building. 2076 * 2077 * The function requires the read-side RCU lock held 2078 * 2079 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2080 */ 2081 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2082 struct sk_buff *skb, u32 info_flags, 2083 struct sta_info *sta) 2084 { 2085 struct ieee80211_local *local = sdata->local; 2086 struct ieee80211_tx_info *info; 2087 int head_need; 2088 u16 ethertype, hdrlen, meshhdrlen = 0; 2089 __le16 fc; 2090 struct ieee80211_hdr hdr; 2091 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2092 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2093 const u8 *encaps_data; 2094 int encaps_len, skip_header_bytes; 2095 int nh_pos, h_pos; 2096 bool wme_sta = false, authorized = false; 2097 bool tdls_peer; 2098 bool multicast; 2099 u16 info_id = 0; 2100 struct ieee80211_chanctx_conf *chanctx_conf; 2101 struct ieee80211_sub_if_data *ap_sdata; 2102 enum ieee80211_band band; 2103 int ret; 2104 2105 if (IS_ERR(sta)) 2106 sta = NULL; 2107 2108 /* convert Ethernet header to proper 802.11 header (based on 2109 * operation mode) */ 2110 ethertype = (skb->data[12] << 8) | skb->data[13]; 2111 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2112 2113 switch (sdata->vif.type) { 2114 case NL80211_IFTYPE_AP_VLAN: 2115 if (sdata->wdev.use_4addr) { 2116 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2117 /* RA TA DA SA */ 2118 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2119 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2120 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2121 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2122 hdrlen = 30; 2123 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2124 wme_sta = sta->sta.wme; 2125 } 2126 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2127 u.ap); 2128 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2129 if (!chanctx_conf) { 2130 ret = -ENOTCONN; 2131 goto free; 2132 } 2133 band = chanctx_conf->def.chan->band; 2134 if (sdata->wdev.use_4addr) 2135 break; 2136 /* fall through */ 2137 case NL80211_IFTYPE_AP: 2138 if (sdata->vif.type == NL80211_IFTYPE_AP) 2139 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2140 if (!chanctx_conf) { 2141 ret = -ENOTCONN; 2142 goto free; 2143 } 2144 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2145 /* DA BSSID SA */ 2146 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2147 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2148 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2149 hdrlen = 24; 2150 band = chanctx_conf->def.chan->band; 2151 break; 2152 case NL80211_IFTYPE_WDS: 2153 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2154 /* RA TA DA SA */ 2155 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2156 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2157 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2158 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2159 hdrlen = 30; 2160 /* 2161 * This is the exception! WDS style interfaces are prohibited 2162 * when channel contexts are in used so this must be valid 2163 */ 2164 band = local->hw.conf.chandef.chan->band; 2165 break; 2166 #ifdef CONFIG_MAC80211_MESH 2167 case NL80211_IFTYPE_MESH_POINT: 2168 if (!is_multicast_ether_addr(skb->data)) { 2169 struct sta_info *next_hop; 2170 bool mpp_lookup = true; 2171 2172 mpath = mesh_path_lookup(sdata, skb->data); 2173 if (mpath) { 2174 mpp_lookup = false; 2175 next_hop = rcu_dereference(mpath->next_hop); 2176 if (!next_hop || 2177 !(mpath->flags & (MESH_PATH_ACTIVE | 2178 MESH_PATH_RESOLVING))) 2179 mpp_lookup = true; 2180 } 2181 2182 if (mpp_lookup) { 2183 mppath = mpp_path_lookup(sdata, skb->data); 2184 if (mppath) 2185 mppath->exp_time = jiffies; 2186 } 2187 2188 if (mppath && mpath) 2189 mesh_path_del(mpath->sdata, mpath->dst); 2190 } 2191 2192 /* 2193 * Use address extension if it is a packet from 2194 * another interface or if we know the destination 2195 * is being proxied by a portal (i.e. portal address 2196 * differs from proxied address) 2197 */ 2198 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2199 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2200 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2201 skb->data, skb->data + ETH_ALEN); 2202 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2203 NULL, NULL); 2204 } else { 2205 /* DS -> MBSS (802.11-2012 13.11.3.3). 2206 * For unicast with unknown forwarding information, 2207 * destination might be in the MBSS or if that fails 2208 * forwarded to another mesh gate. In either case 2209 * resolution will be handled in ieee80211_xmit(), so 2210 * leave the original DA. This also works for mcast */ 2211 const u8 *mesh_da = skb->data; 2212 2213 if (mppath) 2214 mesh_da = mppath->mpp; 2215 else if (mpath) 2216 mesh_da = mpath->dst; 2217 2218 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2219 mesh_da, sdata->vif.addr); 2220 if (is_multicast_ether_addr(mesh_da)) 2221 /* DA TA mSA AE:SA */ 2222 meshhdrlen = ieee80211_new_mesh_header( 2223 sdata, &mesh_hdr, 2224 skb->data + ETH_ALEN, NULL); 2225 else 2226 /* RA TA mDA mSA AE:DA SA */ 2227 meshhdrlen = ieee80211_new_mesh_header( 2228 sdata, &mesh_hdr, skb->data, 2229 skb->data + ETH_ALEN); 2230 2231 } 2232 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2233 if (!chanctx_conf) { 2234 ret = -ENOTCONN; 2235 goto free; 2236 } 2237 band = chanctx_conf->def.chan->band; 2238 break; 2239 #endif 2240 case NL80211_IFTYPE_STATION: 2241 /* we already did checks when looking up the RA STA */ 2242 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2243 2244 if (tdls_peer) { 2245 /* DA SA BSSID */ 2246 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2247 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2248 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2249 hdrlen = 24; 2250 } else if (sdata->u.mgd.use_4addr && 2251 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2252 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2253 IEEE80211_FCTL_TODS); 2254 /* RA TA DA SA */ 2255 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2256 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2257 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2258 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2259 hdrlen = 30; 2260 } else { 2261 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2262 /* BSSID SA DA */ 2263 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2264 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2265 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2266 hdrlen = 24; 2267 } 2268 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2269 if (!chanctx_conf) { 2270 ret = -ENOTCONN; 2271 goto free; 2272 } 2273 band = chanctx_conf->def.chan->band; 2274 break; 2275 case NL80211_IFTYPE_OCB: 2276 /* DA SA BSSID */ 2277 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2278 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2279 eth_broadcast_addr(hdr.addr3); 2280 hdrlen = 24; 2281 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2282 if (!chanctx_conf) { 2283 ret = -ENOTCONN; 2284 goto free; 2285 } 2286 band = chanctx_conf->def.chan->band; 2287 break; 2288 case NL80211_IFTYPE_ADHOC: 2289 /* DA SA BSSID */ 2290 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2291 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2292 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2293 hdrlen = 24; 2294 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2295 if (!chanctx_conf) { 2296 ret = -ENOTCONN; 2297 goto free; 2298 } 2299 band = chanctx_conf->def.chan->band; 2300 break; 2301 default: 2302 ret = -EINVAL; 2303 goto free; 2304 } 2305 2306 multicast = is_multicast_ether_addr(hdr.addr1); 2307 2308 /* sta is always NULL for mesh */ 2309 if (sta) { 2310 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2311 wme_sta = sta->sta.wme; 2312 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2313 /* For mesh, the use of the QoS header is mandatory */ 2314 wme_sta = true; 2315 } 2316 2317 /* receiver does QoS (which also means we do) use it */ 2318 if (wme_sta) { 2319 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2320 hdrlen += 2; 2321 } 2322 2323 /* 2324 * Drop unicast frames to unauthorised stations unless they are 2325 * EAPOL frames from the local station. 2326 */ 2327 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2328 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2329 !multicast && !authorized && 2330 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2331 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2333 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2334 sdata->name, hdr.addr1); 2335 #endif 2336 2337 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2338 2339 ret = -EPERM; 2340 goto free; 2341 } 2342 2343 if (unlikely(!multicast && skb->sk && 2344 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2345 struct sk_buff *ack_skb = skb_clone_sk(skb); 2346 2347 if (ack_skb) { 2348 unsigned long flags; 2349 int id; 2350 2351 spin_lock_irqsave(&local->ack_status_lock, flags); 2352 id = idr_alloc(&local->ack_status_frames, ack_skb, 2353 1, 0x10000, GFP_ATOMIC); 2354 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2355 2356 if (id >= 0) { 2357 info_id = id; 2358 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2359 } else { 2360 kfree_skb(ack_skb); 2361 } 2362 } 2363 } 2364 2365 /* 2366 * If the skb is shared we need to obtain our own copy. 2367 */ 2368 if (skb_shared(skb)) { 2369 struct sk_buff *tmp_skb = skb; 2370 2371 /* can't happen -- skb is a clone if info_id != 0 */ 2372 WARN_ON(info_id); 2373 2374 skb = skb_clone(skb, GFP_ATOMIC); 2375 kfree_skb(tmp_skb); 2376 2377 if (!skb) { 2378 ret = -ENOMEM; 2379 goto free; 2380 } 2381 } 2382 2383 hdr.frame_control = fc; 2384 hdr.duration_id = 0; 2385 hdr.seq_ctrl = 0; 2386 2387 skip_header_bytes = ETH_HLEN; 2388 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2389 encaps_data = bridge_tunnel_header; 2390 encaps_len = sizeof(bridge_tunnel_header); 2391 skip_header_bytes -= 2; 2392 } else if (ethertype >= ETH_P_802_3_MIN) { 2393 encaps_data = rfc1042_header; 2394 encaps_len = sizeof(rfc1042_header); 2395 skip_header_bytes -= 2; 2396 } else { 2397 encaps_data = NULL; 2398 encaps_len = 0; 2399 } 2400 2401 nh_pos = skb_network_header(skb) - skb->data; 2402 h_pos = skb_transport_header(skb) - skb->data; 2403 2404 skb_pull(skb, skip_header_bytes); 2405 nh_pos -= skip_header_bytes; 2406 h_pos -= skip_header_bytes; 2407 2408 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2409 2410 /* 2411 * So we need to modify the skb header and hence need a copy of 2412 * that. The head_need variable above doesn't, so far, include 2413 * the needed header space that we don't need right away. If we 2414 * can, then we don't reallocate right now but only after the 2415 * frame arrives at the master device (if it does...) 2416 * 2417 * If we cannot, however, then we will reallocate to include all 2418 * the ever needed space. Also, if we need to reallocate it anyway, 2419 * make it big enough for everything we may ever need. 2420 */ 2421 2422 if (head_need > 0 || skb_cloned(skb)) { 2423 head_need += sdata->encrypt_headroom; 2424 head_need += local->tx_headroom; 2425 head_need = max_t(int, 0, head_need); 2426 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2427 ieee80211_free_txskb(&local->hw, skb); 2428 skb = NULL; 2429 return ERR_PTR(-ENOMEM); 2430 } 2431 } 2432 2433 if (encaps_data) { 2434 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2435 nh_pos += encaps_len; 2436 h_pos += encaps_len; 2437 } 2438 2439 #ifdef CONFIG_MAC80211_MESH 2440 if (meshhdrlen > 0) { 2441 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2442 nh_pos += meshhdrlen; 2443 h_pos += meshhdrlen; 2444 } 2445 #endif 2446 2447 if (ieee80211_is_data_qos(fc)) { 2448 __le16 *qos_control; 2449 2450 qos_control = (__le16 *) skb_push(skb, 2); 2451 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2452 /* 2453 * Maybe we could actually set some fields here, for now just 2454 * initialise to zero to indicate no special operation. 2455 */ 2456 *qos_control = 0; 2457 } else 2458 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2459 2460 nh_pos += hdrlen; 2461 h_pos += hdrlen; 2462 2463 /* Update skb pointers to various headers since this modified frame 2464 * is going to go through Linux networking code that may potentially 2465 * need things like pointer to IP header. */ 2466 skb_reset_mac_header(skb); 2467 skb_set_network_header(skb, nh_pos); 2468 skb_set_transport_header(skb, h_pos); 2469 2470 info = IEEE80211_SKB_CB(skb); 2471 memset(info, 0, sizeof(*info)); 2472 2473 info->flags = info_flags; 2474 info->ack_frame_id = info_id; 2475 info->band = band; 2476 2477 return skb; 2478 free: 2479 kfree_skb(skb); 2480 return ERR_PTR(ret); 2481 } 2482 2483 /* 2484 * fast-xmit overview 2485 * 2486 * The core idea of this fast-xmit is to remove per-packet checks by checking 2487 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2488 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2489 * much less work can be done per packet. For example, fragmentation must be 2490 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2491 * in the code here. 2492 * 2493 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2494 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2495 * 2496 * The most difficult part of this is that when any of these assumptions 2497 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2498 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2499 * since the per-packet code no longer checks the conditions. This is reflected 2500 * by the calls to these functions throughout the rest of the code, and must be 2501 * maintained if any of the TX path checks change. 2502 */ 2503 2504 void ieee80211_check_fast_xmit(struct sta_info *sta) 2505 { 2506 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2507 struct ieee80211_local *local = sta->local; 2508 struct ieee80211_sub_if_data *sdata = sta->sdata; 2509 struct ieee80211_hdr *hdr = (void *)build.hdr; 2510 struct ieee80211_chanctx_conf *chanctx_conf; 2511 __le16 fc; 2512 2513 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2514 return; 2515 2516 /* Locking here protects both the pointer itself, and against concurrent 2517 * invocations winning data access races to, e.g., the key pointer that 2518 * is used. 2519 * Without it, the invocation of this function right after the key 2520 * pointer changes wouldn't be sufficient, as another CPU could access 2521 * the pointer, then stall, and then do the cache update after the CPU 2522 * that invalidated the key. 2523 * With the locking, such scenarios cannot happen as the check for the 2524 * key and the fast-tx assignment are done atomically, so the CPU that 2525 * modifies the key will either wait or other one will see the key 2526 * cleared/changed already. 2527 */ 2528 spin_lock_bh(&sta->lock); 2529 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2530 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2531 sdata->vif.type == NL80211_IFTYPE_STATION) 2532 goto out; 2533 2534 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2535 goto out; 2536 2537 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2538 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2539 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2540 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2541 goto out; 2542 2543 if (sdata->noack_map) 2544 goto out; 2545 2546 /* fast-xmit doesn't handle fragmentation at all */ 2547 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2548 !local->ops->set_frag_threshold) 2549 goto out; 2550 2551 rcu_read_lock(); 2552 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2553 if (!chanctx_conf) { 2554 rcu_read_unlock(); 2555 goto out; 2556 } 2557 build.band = chanctx_conf->def.chan->band; 2558 rcu_read_unlock(); 2559 2560 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2561 2562 switch (sdata->vif.type) { 2563 case NL80211_IFTYPE_ADHOC: 2564 /* DA SA BSSID */ 2565 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2566 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2567 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2568 build.hdr_len = 24; 2569 break; 2570 case NL80211_IFTYPE_STATION: 2571 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2572 /* DA SA BSSID */ 2573 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2574 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2575 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2576 build.hdr_len = 24; 2577 break; 2578 } 2579 2580 if (sdata->u.mgd.use_4addr) { 2581 /* non-regular ethertype cannot use the fastpath */ 2582 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2583 IEEE80211_FCTL_TODS); 2584 /* RA TA DA SA */ 2585 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2586 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2587 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2588 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2589 build.hdr_len = 30; 2590 break; 2591 } 2592 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2593 /* BSSID SA DA */ 2594 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2595 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2596 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2597 build.hdr_len = 24; 2598 break; 2599 case NL80211_IFTYPE_AP_VLAN: 2600 if (sdata->wdev.use_4addr) { 2601 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2602 IEEE80211_FCTL_TODS); 2603 /* RA TA DA SA */ 2604 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2605 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2606 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2607 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2608 build.hdr_len = 30; 2609 break; 2610 } 2611 /* fall through */ 2612 case NL80211_IFTYPE_AP: 2613 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2614 /* DA BSSID SA */ 2615 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2616 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2617 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2618 build.hdr_len = 24; 2619 break; 2620 default: 2621 /* not handled on fast-xmit */ 2622 goto out; 2623 } 2624 2625 if (sta->sta.wme) { 2626 build.hdr_len += 2; 2627 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2628 } 2629 2630 /* We store the key here so there's no point in using rcu_dereference() 2631 * but that's fine because the code that changes the pointers will call 2632 * this function after doing so. For a single CPU that would be enough, 2633 * for multiple see the comment above. 2634 */ 2635 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2636 if (!build.key) 2637 build.key = rcu_access_pointer(sdata->default_unicast_key); 2638 if (build.key) { 2639 bool gen_iv, iv_spc, mmic; 2640 2641 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2642 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2643 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2644 2645 /* don't handle software crypto */ 2646 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2647 goto out; 2648 2649 switch (build.key->conf.cipher) { 2650 case WLAN_CIPHER_SUITE_CCMP: 2651 case WLAN_CIPHER_SUITE_CCMP_256: 2652 /* add fixed key ID */ 2653 if (gen_iv) { 2654 (build.hdr + build.hdr_len)[3] = 2655 0x20 | (build.key->conf.keyidx << 6); 2656 build.pn_offs = build.hdr_len; 2657 } 2658 if (gen_iv || iv_spc) 2659 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2660 break; 2661 case WLAN_CIPHER_SUITE_GCMP: 2662 case WLAN_CIPHER_SUITE_GCMP_256: 2663 /* add fixed key ID */ 2664 if (gen_iv) { 2665 (build.hdr + build.hdr_len)[3] = 2666 0x20 | (build.key->conf.keyidx << 6); 2667 build.pn_offs = build.hdr_len; 2668 } 2669 if (gen_iv || iv_spc) 2670 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2671 break; 2672 case WLAN_CIPHER_SUITE_TKIP: 2673 /* cannot handle MMIC or IV generation in xmit-fast */ 2674 if (mmic || gen_iv) 2675 goto out; 2676 if (iv_spc) 2677 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2678 break; 2679 case WLAN_CIPHER_SUITE_WEP40: 2680 case WLAN_CIPHER_SUITE_WEP104: 2681 /* cannot handle IV generation in fast-xmit */ 2682 if (gen_iv) 2683 goto out; 2684 if (iv_spc) 2685 build.hdr_len += IEEE80211_WEP_IV_LEN; 2686 break; 2687 case WLAN_CIPHER_SUITE_AES_CMAC: 2688 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2689 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2690 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2691 WARN(1, 2692 "management cipher suite 0x%x enabled for data\n", 2693 build.key->conf.cipher); 2694 goto out; 2695 default: 2696 /* we don't know how to generate IVs for this at all */ 2697 if (WARN_ON(gen_iv)) 2698 goto out; 2699 /* pure hardware keys are OK, of course */ 2700 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2701 break; 2702 /* cipher scheme might require space allocation */ 2703 if (iv_spc && 2704 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2705 goto out; 2706 if (iv_spc) 2707 build.hdr_len += build.key->conf.iv_len; 2708 } 2709 2710 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2711 } 2712 2713 hdr->frame_control = fc; 2714 2715 memcpy(build.hdr + build.hdr_len, 2716 rfc1042_header, sizeof(rfc1042_header)); 2717 build.hdr_len += sizeof(rfc1042_header); 2718 2719 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2720 /* if the kmemdup fails, continue w/o fast_tx */ 2721 if (!fast_tx) 2722 goto out; 2723 2724 out: 2725 /* we might have raced against another call to this function */ 2726 old = rcu_dereference_protected(sta->fast_tx, 2727 lockdep_is_held(&sta->lock)); 2728 rcu_assign_pointer(sta->fast_tx, fast_tx); 2729 if (old) 2730 kfree_rcu(old, rcu_head); 2731 spin_unlock_bh(&sta->lock); 2732 } 2733 2734 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2735 { 2736 struct sta_info *sta; 2737 2738 rcu_read_lock(); 2739 list_for_each_entry_rcu(sta, &local->sta_list, list) 2740 ieee80211_check_fast_xmit(sta); 2741 rcu_read_unlock(); 2742 } 2743 2744 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2745 { 2746 struct ieee80211_local *local = sdata->local; 2747 struct sta_info *sta; 2748 2749 rcu_read_lock(); 2750 2751 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2752 if (sdata != sta->sdata && 2753 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2754 continue; 2755 ieee80211_check_fast_xmit(sta); 2756 } 2757 2758 rcu_read_unlock(); 2759 } 2760 2761 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2762 { 2763 struct ieee80211_fast_tx *fast_tx; 2764 2765 spin_lock_bh(&sta->lock); 2766 fast_tx = rcu_dereference_protected(sta->fast_tx, 2767 lockdep_is_held(&sta->lock)); 2768 RCU_INIT_POINTER(sta->fast_tx, NULL); 2769 spin_unlock_bh(&sta->lock); 2770 2771 if (fast_tx) 2772 kfree_rcu(fast_tx, rcu_head); 2773 } 2774 2775 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2776 struct net_device *dev, struct sta_info *sta, 2777 struct ieee80211_fast_tx *fast_tx, 2778 struct sk_buff *skb) 2779 { 2780 struct ieee80211_local *local = sdata->local; 2781 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2782 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2783 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2784 struct ethhdr eth; 2785 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2786 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2787 struct ieee80211_tx_data tx; 2788 ieee80211_tx_result r; 2789 struct tid_ampdu_tx *tid_tx = NULL; 2790 u8 tid = IEEE80211_NUM_TIDS; 2791 2792 /* control port protocol needs a lot of special handling */ 2793 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2794 return false; 2795 2796 /* only RFC 1042 SNAP */ 2797 if (ethertype < ETH_P_802_3_MIN) 2798 return false; 2799 2800 /* don't handle TX status request here either */ 2801 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2802 return false; 2803 2804 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2805 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2806 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2807 if (tid_tx) { 2808 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2809 return false; 2810 if (tid_tx->timeout) 2811 tid_tx->last_tx = jiffies; 2812 } 2813 } 2814 2815 /* after this point (skb is modified) we cannot return false */ 2816 2817 if (skb_shared(skb)) { 2818 struct sk_buff *tmp_skb = skb; 2819 2820 skb = skb_clone(skb, GFP_ATOMIC); 2821 kfree_skb(tmp_skb); 2822 2823 if (!skb) 2824 return true; 2825 } 2826 2827 ieee80211_tx_stats(dev, skb->len + extra_head); 2828 2829 /* will not be crypto-handled beyond what we do here, so use false 2830 * as the may-encrypt argument for the resize to not account for 2831 * more room than we already have in 'extra_head' 2832 */ 2833 if (unlikely(ieee80211_skb_resize(sdata, skb, 2834 max_t(int, extra_head + hw_headroom - 2835 skb_headroom(skb), 0), 2836 false))) { 2837 kfree_skb(skb); 2838 return true; 2839 } 2840 2841 memcpy(ð, skb->data, ETH_HLEN - 2); 2842 hdr = (void *)skb_push(skb, extra_head); 2843 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 2844 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 2845 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 2846 2847 memset(info, 0, sizeof(*info)); 2848 info->band = fast_tx->band; 2849 info->control.vif = &sdata->vif; 2850 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 2851 IEEE80211_TX_CTL_DONTFRAG | 2852 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 2853 2854 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2855 *ieee80211_get_qos_ctl(hdr) = tid; 2856 if (!sta->sta.txq[0]) 2857 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 2858 } else { 2859 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2860 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 2861 sdata->sequence_number += 0x10; 2862 } 2863 2864 if (skb_shinfo(skb)->gso_size) 2865 sta->tx_stats.msdu[tid] += 2866 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 2867 else 2868 sta->tx_stats.msdu[tid]++; 2869 2870 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2871 2872 __skb_queue_head_init(&tx.skbs); 2873 2874 tx.flags = IEEE80211_TX_UNICAST; 2875 tx.local = local; 2876 tx.sdata = sdata; 2877 tx.sta = sta; 2878 tx.key = fast_tx->key; 2879 2880 if (fast_tx->key) 2881 info->control.hw_key = &fast_tx->key->conf; 2882 2883 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 2884 tx.skb = skb; 2885 r = ieee80211_tx_h_rate_ctrl(&tx); 2886 skb = tx.skb; 2887 tx.skb = NULL; 2888 2889 if (r != TX_CONTINUE) { 2890 if (r != TX_QUEUED) 2891 kfree_skb(skb); 2892 return true; 2893 } 2894 } 2895 2896 /* statistics normally done by ieee80211_tx_h_stats (but that 2897 * has to consider fragmentation, so is more complex) 2898 */ 2899 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 2900 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 2901 2902 if (fast_tx->pn_offs) { 2903 u64 pn; 2904 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 2905 2906 switch (fast_tx->key->conf.cipher) { 2907 case WLAN_CIPHER_SUITE_CCMP: 2908 case WLAN_CIPHER_SUITE_CCMP_256: 2909 case WLAN_CIPHER_SUITE_GCMP: 2910 case WLAN_CIPHER_SUITE_GCMP_256: 2911 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 2912 crypto_hdr[0] = pn; 2913 crypto_hdr[1] = pn >> 8; 2914 crypto_hdr[4] = pn >> 16; 2915 crypto_hdr[5] = pn >> 24; 2916 crypto_hdr[6] = pn >> 32; 2917 crypto_hdr[7] = pn >> 40; 2918 break; 2919 } 2920 } 2921 2922 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2923 sdata = container_of(sdata->bss, 2924 struct ieee80211_sub_if_data, u.ap); 2925 2926 __skb_queue_tail(&tx.skbs, skb); 2927 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 2928 return true; 2929 } 2930 2931 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 2932 struct net_device *dev, 2933 u32 info_flags) 2934 { 2935 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2936 struct sta_info *sta; 2937 struct sk_buff *next; 2938 2939 if (unlikely(skb->len < ETH_HLEN)) { 2940 kfree_skb(skb); 2941 return; 2942 } 2943 2944 rcu_read_lock(); 2945 2946 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 2947 goto out_free; 2948 2949 if (!IS_ERR_OR_NULL(sta)) { 2950 struct ieee80211_fast_tx *fast_tx; 2951 2952 fast_tx = rcu_dereference(sta->fast_tx); 2953 2954 if (fast_tx && 2955 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 2956 goto out; 2957 } 2958 2959 if (skb_is_gso(skb)) { 2960 struct sk_buff *segs; 2961 2962 segs = skb_gso_segment(skb, 0); 2963 if (IS_ERR(segs)) { 2964 goto out_free; 2965 } else if (segs) { 2966 consume_skb(skb); 2967 skb = segs; 2968 } 2969 } else { 2970 /* we cannot process non-linear frames on this path */ 2971 if (skb_linearize(skb)) { 2972 kfree_skb(skb); 2973 goto out; 2974 } 2975 2976 /* the frame could be fragmented, software-encrypted, and other 2977 * things so we cannot really handle checksum offload with it - 2978 * fix it up in software before we handle anything else. 2979 */ 2980 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2981 skb_set_transport_header(skb, 2982 skb_checksum_start_offset(skb)); 2983 if (skb_checksum_help(skb)) 2984 goto out_free; 2985 } 2986 } 2987 2988 next = skb; 2989 while (next) { 2990 skb = next; 2991 next = skb->next; 2992 2993 skb->prev = NULL; 2994 skb->next = NULL; 2995 2996 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2997 if (IS_ERR(skb)) 2998 goto out; 2999 3000 ieee80211_tx_stats(dev, skb->len); 3001 3002 ieee80211_xmit(sdata, sta, skb); 3003 } 3004 goto out; 3005 out_free: 3006 kfree_skb(skb); 3007 out: 3008 rcu_read_unlock(); 3009 } 3010 3011 /** 3012 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3013 * @skb: packet to be sent 3014 * @dev: incoming interface 3015 * 3016 * On failure skb will be freed. 3017 */ 3018 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3019 struct net_device *dev) 3020 { 3021 __ieee80211_subif_start_xmit(skb, dev, 0); 3022 return NETDEV_TX_OK; 3023 } 3024 3025 struct sk_buff * 3026 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3027 struct sk_buff *skb, u32 info_flags) 3028 { 3029 struct ieee80211_hdr *hdr; 3030 struct ieee80211_tx_data tx = { 3031 .local = sdata->local, 3032 .sdata = sdata, 3033 }; 3034 struct sta_info *sta; 3035 3036 rcu_read_lock(); 3037 3038 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3039 kfree_skb(skb); 3040 skb = ERR_PTR(-EINVAL); 3041 goto out; 3042 } 3043 3044 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3045 if (IS_ERR(skb)) 3046 goto out; 3047 3048 hdr = (void *)skb->data; 3049 tx.sta = sta_info_get(sdata, hdr->addr1); 3050 tx.skb = skb; 3051 3052 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3053 rcu_read_unlock(); 3054 kfree_skb(skb); 3055 return ERR_PTR(-EINVAL); 3056 } 3057 3058 out: 3059 rcu_read_unlock(); 3060 return skb; 3061 } 3062 3063 /* 3064 * ieee80211_clear_tx_pending may not be called in a context where 3065 * it is possible that it packets could come in again. 3066 */ 3067 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3068 { 3069 struct sk_buff *skb; 3070 int i; 3071 3072 for (i = 0; i < local->hw.queues; i++) { 3073 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3074 ieee80211_free_txskb(&local->hw, skb); 3075 } 3076 } 3077 3078 /* 3079 * Returns false if the frame couldn't be transmitted but was queued instead, 3080 * which in this case means re-queued -- take as an indication to stop sending 3081 * more pending frames. 3082 */ 3083 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3084 struct sk_buff *skb) 3085 { 3086 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3087 struct ieee80211_sub_if_data *sdata; 3088 struct sta_info *sta; 3089 struct ieee80211_hdr *hdr; 3090 bool result; 3091 struct ieee80211_chanctx_conf *chanctx_conf; 3092 3093 sdata = vif_to_sdata(info->control.vif); 3094 3095 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3096 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3097 if (unlikely(!chanctx_conf)) { 3098 dev_kfree_skb(skb); 3099 return true; 3100 } 3101 info->band = chanctx_conf->def.chan->band; 3102 result = ieee80211_tx(sdata, NULL, skb, true); 3103 } else { 3104 struct sk_buff_head skbs; 3105 3106 __skb_queue_head_init(&skbs); 3107 __skb_queue_tail(&skbs, skb); 3108 3109 hdr = (struct ieee80211_hdr *)skb->data; 3110 sta = sta_info_get(sdata, hdr->addr1); 3111 3112 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3113 } 3114 3115 return result; 3116 } 3117 3118 /* 3119 * Transmit all pending packets. Called from tasklet. 3120 */ 3121 void ieee80211_tx_pending(unsigned long data) 3122 { 3123 struct ieee80211_local *local = (struct ieee80211_local *)data; 3124 unsigned long flags; 3125 int i; 3126 bool txok; 3127 3128 rcu_read_lock(); 3129 3130 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3131 for (i = 0; i < local->hw.queues; i++) { 3132 /* 3133 * If queue is stopped by something other than due to pending 3134 * frames, or we have no pending frames, proceed to next queue. 3135 */ 3136 if (local->queue_stop_reasons[i] || 3137 skb_queue_empty(&local->pending[i])) 3138 continue; 3139 3140 while (!skb_queue_empty(&local->pending[i])) { 3141 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3142 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3143 3144 if (WARN_ON(!info->control.vif)) { 3145 ieee80211_free_txskb(&local->hw, skb); 3146 continue; 3147 } 3148 3149 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3150 flags); 3151 3152 txok = ieee80211_tx_pending_skb(local, skb); 3153 spin_lock_irqsave(&local->queue_stop_reason_lock, 3154 flags); 3155 if (!txok) 3156 break; 3157 } 3158 3159 if (skb_queue_empty(&local->pending[i])) 3160 ieee80211_propagate_queue_wake(local, i); 3161 } 3162 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3163 3164 rcu_read_unlock(); 3165 } 3166 3167 /* functions for drivers to get certain frames */ 3168 3169 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3170 struct ps_data *ps, struct sk_buff *skb, 3171 bool is_template) 3172 { 3173 u8 *pos, *tim; 3174 int aid0 = 0; 3175 int i, have_bits = 0, n1, n2; 3176 3177 /* Generate bitmap for TIM only if there are any STAs in power save 3178 * mode. */ 3179 if (atomic_read(&ps->num_sta_ps) > 0) 3180 /* in the hope that this is faster than 3181 * checking byte-for-byte */ 3182 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3183 IEEE80211_MAX_AID+1); 3184 if (!is_template) { 3185 if (ps->dtim_count == 0) 3186 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3187 else 3188 ps->dtim_count--; 3189 } 3190 3191 tim = pos = (u8 *) skb_put(skb, 6); 3192 *pos++ = WLAN_EID_TIM; 3193 *pos++ = 4; 3194 *pos++ = ps->dtim_count; 3195 *pos++ = sdata->vif.bss_conf.dtim_period; 3196 3197 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3198 aid0 = 1; 3199 3200 ps->dtim_bc_mc = aid0 == 1; 3201 3202 if (have_bits) { 3203 /* Find largest even number N1 so that bits numbered 1 through 3204 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3205 * (N2 + 1) x 8 through 2007 are 0. */ 3206 n1 = 0; 3207 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3208 if (ps->tim[i]) { 3209 n1 = i & 0xfe; 3210 break; 3211 } 3212 } 3213 n2 = n1; 3214 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3215 if (ps->tim[i]) { 3216 n2 = i; 3217 break; 3218 } 3219 } 3220 3221 /* Bitmap control */ 3222 *pos++ = n1 | aid0; 3223 /* Part Virt Bitmap */ 3224 skb_put(skb, n2 - n1); 3225 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3226 3227 tim[1] = n2 - n1 + 4; 3228 } else { 3229 *pos++ = aid0; /* Bitmap control */ 3230 *pos++ = 0; /* Part Virt Bitmap */ 3231 } 3232 } 3233 3234 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3235 struct ps_data *ps, struct sk_buff *skb, 3236 bool is_template) 3237 { 3238 struct ieee80211_local *local = sdata->local; 3239 3240 /* 3241 * Not very nice, but we want to allow the driver to call 3242 * ieee80211_beacon_get() as a response to the set_tim() 3243 * callback. That, however, is already invoked under the 3244 * sta_lock to guarantee consistent and race-free update 3245 * of the tim bitmap in mac80211 and the driver. 3246 */ 3247 if (local->tim_in_locked_section) { 3248 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3249 } else { 3250 spin_lock_bh(&local->tim_lock); 3251 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3252 spin_unlock_bh(&local->tim_lock); 3253 } 3254 3255 return 0; 3256 } 3257 3258 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3259 struct beacon_data *beacon) 3260 { 3261 struct probe_resp *resp; 3262 u8 *beacon_data; 3263 size_t beacon_data_len; 3264 int i; 3265 u8 count = beacon->csa_current_counter; 3266 3267 switch (sdata->vif.type) { 3268 case NL80211_IFTYPE_AP: 3269 beacon_data = beacon->tail; 3270 beacon_data_len = beacon->tail_len; 3271 break; 3272 case NL80211_IFTYPE_ADHOC: 3273 beacon_data = beacon->head; 3274 beacon_data_len = beacon->head_len; 3275 break; 3276 case NL80211_IFTYPE_MESH_POINT: 3277 beacon_data = beacon->head; 3278 beacon_data_len = beacon->head_len; 3279 break; 3280 default: 3281 return; 3282 } 3283 3284 rcu_read_lock(); 3285 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3286 resp = rcu_dereference(sdata->u.ap.probe_resp); 3287 3288 if (beacon->csa_counter_offsets[i]) { 3289 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3290 beacon_data_len)) { 3291 rcu_read_unlock(); 3292 return; 3293 } 3294 3295 beacon_data[beacon->csa_counter_offsets[i]] = count; 3296 } 3297 3298 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3299 resp->data[resp->csa_counter_offsets[i]] = count; 3300 } 3301 rcu_read_unlock(); 3302 } 3303 3304 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3305 { 3306 beacon->csa_current_counter--; 3307 3308 /* the counter should never reach 0 */ 3309 WARN_ON_ONCE(!beacon->csa_current_counter); 3310 3311 return beacon->csa_current_counter; 3312 } 3313 3314 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3315 { 3316 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3317 struct beacon_data *beacon = NULL; 3318 u8 count = 0; 3319 3320 rcu_read_lock(); 3321 3322 if (sdata->vif.type == NL80211_IFTYPE_AP) 3323 beacon = rcu_dereference(sdata->u.ap.beacon); 3324 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3325 beacon = rcu_dereference(sdata->u.ibss.presp); 3326 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3327 beacon = rcu_dereference(sdata->u.mesh.beacon); 3328 3329 if (!beacon) 3330 goto unlock; 3331 3332 count = __ieee80211_csa_update_counter(beacon); 3333 3334 unlock: 3335 rcu_read_unlock(); 3336 return count; 3337 } 3338 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3339 3340 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3341 { 3342 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3343 struct beacon_data *beacon = NULL; 3344 u8 *beacon_data; 3345 size_t beacon_data_len; 3346 int ret = false; 3347 3348 if (!ieee80211_sdata_running(sdata)) 3349 return false; 3350 3351 rcu_read_lock(); 3352 if (vif->type == NL80211_IFTYPE_AP) { 3353 struct ieee80211_if_ap *ap = &sdata->u.ap; 3354 3355 beacon = rcu_dereference(ap->beacon); 3356 if (WARN_ON(!beacon || !beacon->tail)) 3357 goto out; 3358 beacon_data = beacon->tail; 3359 beacon_data_len = beacon->tail_len; 3360 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3361 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3362 3363 beacon = rcu_dereference(ifibss->presp); 3364 if (!beacon) 3365 goto out; 3366 3367 beacon_data = beacon->head; 3368 beacon_data_len = beacon->head_len; 3369 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3370 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3371 3372 beacon = rcu_dereference(ifmsh->beacon); 3373 if (!beacon) 3374 goto out; 3375 3376 beacon_data = beacon->head; 3377 beacon_data_len = beacon->head_len; 3378 } else { 3379 WARN_ON(1); 3380 goto out; 3381 } 3382 3383 if (!beacon->csa_counter_offsets[0]) 3384 goto out; 3385 3386 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3387 goto out; 3388 3389 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3390 ret = true; 3391 out: 3392 rcu_read_unlock(); 3393 3394 return ret; 3395 } 3396 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3397 3398 static struct sk_buff * 3399 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3400 struct ieee80211_vif *vif, 3401 struct ieee80211_mutable_offsets *offs, 3402 bool is_template) 3403 { 3404 struct ieee80211_local *local = hw_to_local(hw); 3405 struct beacon_data *beacon = NULL; 3406 struct sk_buff *skb = NULL; 3407 struct ieee80211_tx_info *info; 3408 struct ieee80211_sub_if_data *sdata = NULL; 3409 enum ieee80211_band band; 3410 struct ieee80211_tx_rate_control txrc; 3411 struct ieee80211_chanctx_conf *chanctx_conf; 3412 int csa_off_base = 0; 3413 3414 rcu_read_lock(); 3415 3416 sdata = vif_to_sdata(vif); 3417 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3418 3419 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3420 goto out; 3421 3422 if (offs) 3423 memset(offs, 0, sizeof(*offs)); 3424 3425 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3426 struct ieee80211_if_ap *ap = &sdata->u.ap; 3427 3428 beacon = rcu_dereference(ap->beacon); 3429 if (beacon) { 3430 if (beacon->csa_counter_offsets[0]) { 3431 if (!is_template) 3432 __ieee80211_csa_update_counter(beacon); 3433 3434 ieee80211_set_csa(sdata, beacon); 3435 } 3436 3437 /* 3438 * headroom, head length, 3439 * tail length and maximum TIM length 3440 */ 3441 skb = dev_alloc_skb(local->tx_headroom + 3442 beacon->head_len + 3443 beacon->tail_len + 256 + 3444 local->hw.extra_beacon_tailroom); 3445 if (!skb) 3446 goto out; 3447 3448 skb_reserve(skb, local->tx_headroom); 3449 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3450 beacon->head_len); 3451 3452 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3453 is_template); 3454 3455 if (offs) { 3456 offs->tim_offset = beacon->head_len; 3457 offs->tim_length = skb->len - beacon->head_len; 3458 3459 /* for AP the csa offsets are from tail */ 3460 csa_off_base = skb->len; 3461 } 3462 3463 if (beacon->tail) 3464 memcpy(skb_put(skb, beacon->tail_len), 3465 beacon->tail, beacon->tail_len); 3466 } else 3467 goto out; 3468 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3469 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3470 struct ieee80211_hdr *hdr; 3471 3472 beacon = rcu_dereference(ifibss->presp); 3473 if (!beacon) 3474 goto out; 3475 3476 if (beacon->csa_counter_offsets[0]) { 3477 if (!is_template) 3478 __ieee80211_csa_update_counter(beacon); 3479 3480 ieee80211_set_csa(sdata, beacon); 3481 } 3482 3483 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3484 local->hw.extra_beacon_tailroom); 3485 if (!skb) 3486 goto out; 3487 skb_reserve(skb, local->tx_headroom); 3488 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3489 beacon->head_len); 3490 3491 hdr = (struct ieee80211_hdr *) skb->data; 3492 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3493 IEEE80211_STYPE_BEACON); 3494 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3495 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3496 3497 beacon = rcu_dereference(ifmsh->beacon); 3498 if (!beacon) 3499 goto out; 3500 3501 if (beacon->csa_counter_offsets[0]) { 3502 if (!is_template) 3503 /* TODO: For mesh csa_counter is in TU, so 3504 * decrementing it by one isn't correct, but 3505 * for now we leave it consistent with overall 3506 * mac80211's behavior. 3507 */ 3508 __ieee80211_csa_update_counter(beacon); 3509 3510 ieee80211_set_csa(sdata, beacon); 3511 } 3512 3513 if (ifmsh->sync_ops) 3514 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3515 3516 skb = dev_alloc_skb(local->tx_headroom + 3517 beacon->head_len + 3518 256 + /* TIM IE */ 3519 beacon->tail_len + 3520 local->hw.extra_beacon_tailroom); 3521 if (!skb) 3522 goto out; 3523 skb_reserve(skb, local->tx_headroom); 3524 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3525 beacon->head_len); 3526 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3527 3528 if (offs) { 3529 offs->tim_offset = beacon->head_len; 3530 offs->tim_length = skb->len - beacon->head_len; 3531 } 3532 3533 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3534 beacon->tail_len); 3535 } else { 3536 WARN_ON(1); 3537 goto out; 3538 } 3539 3540 /* CSA offsets */ 3541 if (offs && beacon) { 3542 int i; 3543 3544 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3545 u16 csa_off = beacon->csa_counter_offsets[i]; 3546 3547 if (!csa_off) 3548 continue; 3549 3550 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3551 } 3552 } 3553 3554 band = chanctx_conf->def.chan->band; 3555 3556 info = IEEE80211_SKB_CB(skb); 3557 3558 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3559 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3560 info->band = band; 3561 3562 memset(&txrc, 0, sizeof(txrc)); 3563 txrc.hw = hw; 3564 txrc.sband = local->hw.wiphy->bands[band]; 3565 txrc.bss_conf = &sdata->vif.bss_conf; 3566 txrc.skb = skb; 3567 txrc.reported_rate.idx = -1; 3568 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3569 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3570 txrc.max_rate_idx = -1; 3571 else 3572 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3573 txrc.bss = true; 3574 rate_control_get_rate(sdata, NULL, &txrc); 3575 3576 info->control.vif = vif; 3577 3578 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3579 IEEE80211_TX_CTL_ASSIGN_SEQ | 3580 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3581 out: 3582 rcu_read_unlock(); 3583 return skb; 3584 3585 } 3586 3587 struct sk_buff * 3588 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3589 struct ieee80211_vif *vif, 3590 struct ieee80211_mutable_offsets *offs) 3591 { 3592 return __ieee80211_beacon_get(hw, vif, offs, true); 3593 } 3594 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3595 3596 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3597 struct ieee80211_vif *vif, 3598 u16 *tim_offset, u16 *tim_length) 3599 { 3600 struct ieee80211_mutable_offsets offs = {}; 3601 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3602 struct sk_buff *copy; 3603 struct ieee80211_supported_band *sband; 3604 int shift; 3605 3606 if (!bcn) 3607 return bcn; 3608 3609 if (tim_offset) 3610 *tim_offset = offs.tim_offset; 3611 3612 if (tim_length) 3613 *tim_length = offs.tim_length; 3614 3615 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 3616 !hw_to_local(hw)->monitors) 3617 return bcn; 3618 3619 /* send a copy to monitor interfaces */ 3620 copy = skb_copy(bcn, GFP_ATOMIC); 3621 if (!copy) 3622 return bcn; 3623 3624 shift = ieee80211_vif_get_shift(vif); 3625 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 3626 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 3627 3628 return bcn; 3629 } 3630 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3631 3632 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3633 struct ieee80211_vif *vif) 3634 { 3635 struct ieee80211_if_ap *ap = NULL; 3636 struct sk_buff *skb = NULL; 3637 struct probe_resp *presp = NULL; 3638 struct ieee80211_hdr *hdr; 3639 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3640 3641 if (sdata->vif.type != NL80211_IFTYPE_AP) 3642 return NULL; 3643 3644 rcu_read_lock(); 3645 3646 ap = &sdata->u.ap; 3647 presp = rcu_dereference(ap->probe_resp); 3648 if (!presp) 3649 goto out; 3650 3651 skb = dev_alloc_skb(presp->len); 3652 if (!skb) 3653 goto out; 3654 3655 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3656 3657 hdr = (struct ieee80211_hdr *) skb->data; 3658 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3659 3660 out: 3661 rcu_read_unlock(); 3662 return skb; 3663 } 3664 EXPORT_SYMBOL(ieee80211_proberesp_get); 3665 3666 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3667 struct ieee80211_vif *vif) 3668 { 3669 struct ieee80211_sub_if_data *sdata; 3670 struct ieee80211_if_managed *ifmgd; 3671 struct ieee80211_pspoll *pspoll; 3672 struct ieee80211_local *local; 3673 struct sk_buff *skb; 3674 3675 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3676 return NULL; 3677 3678 sdata = vif_to_sdata(vif); 3679 ifmgd = &sdata->u.mgd; 3680 local = sdata->local; 3681 3682 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3683 if (!skb) 3684 return NULL; 3685 3686 skb_reserve(skb, local->hw.extra_tx_headroom); 3687 3688 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3689 memset(pspoll, 0, sizeof(*pspoll)); 3690 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3691 IEEE80211_STYPE_PSPOLL); 3692 pspoll->aid = cpu_to_le16(ifmgd->aid); 3693 3694 /* aid in PS-Poll has its two MSBs each set to 1 */ 3695 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3696 3697 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3698 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3699 3700 return skb; 3701 } 3702 EXPORT_SYMBOL(ieee80211_pspoll_get); 3703 3704 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3705 struct ieee80211_vif *vif) 3706 { 3707 struct ieee80211_hdr_3addr *nullfunc; 3708 struct ieee80211_sub_if_data *sdata; 3709 struct ieee80211_if_managed *ifmgd; 3710 struct ieee80211_local *local; 3711 struct sk_buff *skb; 3712 3713 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3714 return NULL; 3715 3716 sdata = vif_to_sdata(vif); 3717 ifmgd = &sdata->u.mgd; 3718 local = sdata->local; 3719 3720 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3721 if (!skb) 3722 return NULL; 3723 3724 skb_reserve(skb, local->hw.extra_tx_headroom); 3725 3726 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3727 sizeof(*nullfunc)); 3728 memset(nullfunc, 0, sizeof(*nullfunc)); 3729 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3730 IEEE80211_STYPE_NULLFUNC | 3731 IEEE80211_FCTL_TODS); 3732 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3733 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3734 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3735 3736 return skb; 3737 } 3738 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3739 3740 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3741 const u8 *src_addr, 3742 const u8 *ssid, size_t ssid_len, 3743 size_t tailroom) 3744 { 3745 struct ieee80211_local *local = hw_to_local(hw); 3746 struct ieee80211_hdr_3addr *hdr; 3747 struct sk_buff *skb; 3748 size_t ie_ssid_len; 3749 u8 *pos; 3750 3751 ie_ssid_len = 2 + ssid_len; 3752 3753 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3754 ie_ssid_len + tailroom); 3755 if (!skb) 3756 return NULL; 3757 3758 skb_reserve(skb, local->hw.extra_tx_headroom); 3759 3760 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3761 memset(hdr, 0, sizeof(*hdr)); 3762 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3763 IEEE80211_STYPE_PROBE_REQ); 3764 eth_broadcast_addr(hdr->addr1); 3765 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3766 eth_broadcast_addr(hdr->addr3); 3767 3768 pos = skb_put(skb, ie_ssid_len); 3769 *pos++ = WLAN_EID_SSID; 3770 *pos++ = ssid_len; 3771 if (ssid_len) 3772 memcpy(pos, ssid, ssid_len); 3773 pos += ssid_len; 3774 3775 return skb; 3776 } 3777 EXPORT_SYMBOL(ieee80211_probereq_get); 3778 3779 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3780 const void *frame, size_t frame_len, 3781 const struct ieee80211_tx_info *frame_txctl, 3782 struct ieee80211_rts *rts) 3783 { 3784 const struct ieee80211_hdr *hdr = frame; 3785 3786 rts->frame_control = 3787 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3788 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3789 frame_txctl); 3790 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3791 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3792 } 3793 EXPORT_SYMBOL(ieee80211_rts_get); 3794 3795 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3796 const void *frame, size_t frame_len, 3797 const struct ieee80211_tx_info *frame_txctl, 3798 struct ieee80211_cts *cts) 3799 { 3800 const struct ieee80211_hdr *hdr = frame; 3801 3802 cts->frame_control = 3803 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3804 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3805 frame_len, frame_txctl); 3806 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3807 } 3808 EXPORT_SYMBOL(ieee80211_ctstoself_get); 3809 3810 struct sk_buff * 3811 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 3812 struct ieee80211_vif *vif) 3813 { 3814 struct ieee80211_local *local = hw_to_local(hw); 3815 struct sk_buff *skb = NULL; 3816 struct ieee80211_tx_data tx; 3817 struct ieee80211_sub_if_data *sdata; 3818 struct ps_data *ps; 3819 struct ieee80211_tx_info *info; 3820 struct ieee80211_chanctx_conf *chanctx_conf; 3821 3822 sdata = vif_to_sdata(vif); 3823 3824 rcu_read_lock(); 3825 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3826 3827 if (!chanctx_conf) 3828 goto out; 3829 3830 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3831 struct beacon_data *beacon = 3832 rcu_dereference(sdata->u.ap.beacon); 3833 3834 if (!beacon || !beacon->head) 3835 goto out; 3836 3837 ps = &sdata->u.ap.ps; 3838 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3839 ps = &sdata->u.mesh.ps; 3840 } else { 3841 goto out; 3842 } 3843 3844 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 3845 goto out; /* send buffered bc/mc only after DTIM beacon */ 3846 3847 while (1) { 3848 skb = skb_dequeue(&ps->bc_buf); 3849 if (!skb) 3850 goto out; 3851 local->total_ps_buffered--; 3852 3853 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 3854 struct ieee80211_hdr *hdr = 3855 (struct ieee80211_hdr *) skb->data; 3856 /* more buffered multicast/broadcast frames ==> set 3857 * MoreData flag in IEEE 802.11 header to inform PS 3858 * STAs */ 3859 hdr->frame_control |= 3860 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3861 } 3862 3863 if (sdata->vif.type == NL80211_IFTYPE_AP) 3864 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3865 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 3866 break; 3867 dev_kfree_skb_any(skb); 3868 } 3869 3870 info = IEEE80211_SKB_CB(skb); 3871 3872 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3873 info->band = chanctx_conf->def.chan->band; 3874 3875 if (invoke_tx_handlers(&tx)) 3876 skb = NULL; 3877 out: 3878 rcu_read_unlock(); 3879 3880 return skb; 3881 } 3882 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3883 3884 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3885 { 3886 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3887 struct ieee80211_sub_if_data *sdata = sta->sdata; 3888 struct ieee80211_local *local = sdata->local; 3889 int ret; 3890 u32 queues; 3891 3892 lockdep_assert_held(&local->sta_mtx); 3893 3894 /* only some cases are supported right now */ 3895 switch (sdata->vif.type) { 3896 case NL80211_IFTYPE_STATION: 3897 case NL80211_IFTYPE_AP: 3898 case NL80211_IFTYPE_AP_VLAN: 3899 break; 3900 default: 3901 WARN_ON(1); 3902 return -EINVAL; 3903 } 3904 3905 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 3906 return -EINVAL; 3907 3908 if (sta->reserved_tid == tid) { 3909 ret = 0; 3910 goto out; 3911 } 3912 3913 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 3914 sdata_err(sdata, "TID reservation already active\n"); 3915 ret = -EALREADY; 3916 goto out; 3917 } 3918 3919 ieee80211_stop_vif_queues(sdata->local, sdata, 3920 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3921 3922 synchronize_net(); 3923 3924 /* Tear down BA sessions so we stop aggregating on this TID */ 3925 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 3926 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 3927 __ieee80211_stop_tx_ba_session(sta, tid, 3928 AGG_STOP_LOCAL_REQUEST); 3929 } 3930 3931 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 3932 __ieee80211_flush_queues(local, sdata, queues, false); 3933 3934 sta->reserved_tid = tid; 3935 3936 ieee80211_wake_vif_queues(local, sdata, 3937 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3938 3939 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 3940 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 3941 3942 ret = 0; 3943 out: 3944 return ret; 3945 } 3946 EXPORT_SYMBOL(ieee80211_reserve_tid); 3947 3948 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3949 { 3950 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3951 struct ieee80211_sub_if_data *sdata = sta->sdata; 3952 3953 lockdep_assert_held(&sdata->local->sta_mtx); 3954 3955 /* only some cases are supported right now */ 3956 switch (sdata->vif.type) { 3957 case NL80211_IFTYPE_STATION: 3958 case NL80211_IFTYPE_AP: 3959 case NL80211_IFTYPE_AP_VLAN: 3960 break; 3961 default: 3962 WARN_ON(1); 3963 return; 3964 } 3965 3966 if (tid != sta->reserved_tid) { 3967 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 3968 return; 3969 } 3970 3971 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 3972 } 3973 EXPORT_SYMBOL(ieee80211_unreserve_tid); 3974 3975 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3976 struct sk_buff *skb, int tid, 3977 enum ieee80211_band band) 3978 { 3979 int ac = ieee802_1d_to_ac[tid & 7]; 3980 3981 skb_reset_mac_header(skb); 3982 skb_reset_network_header(skb); 3983 skb_reset_transport_header(skb); 3984 3985 skb_set_queue_mapping(skb, ac); 3986 skb->priority = tid; 3987 3988 skb->dev = sdata->dev; 3989 3990 /* 3991 * The other path calling ieee80211_xmit is from the tasklet, 3992 * and while we can handle concurrent transmissions locking 3993 * requirements are that we do not come into tx with bhs on. 3994 */ 3995 local_bh_disable(); 3996 IEEE80211_SKB_CB(skb)->band = band; 3997 ieee80211_xmit(sdata, NULL, skb); 3998 local_bh_enable(); 3999 } 4000