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 NL80211_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 NL80211_BAND_5GHZ: 164 if (r->flags & IEEE80211_RATE_MANDATORY_A) 165 mrate = r->bitrate; 166 break; 167 case NL80211_BAND_60GHZ: 168 /* TODO, for now fall through */ 169 case NUM_NL80211_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 if (skb && skb_has_frag_list(skb) && 1333 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) 1334 skb_linearize(skb); 1335 1336 return skb; 1337 } 1338 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1339 1340 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1341 struct ieee80211_vif *vif, 1342 struct ieee80211_sta *sta, 1343 struct sk_buff_head *skbs, 1344 bool txpending) 1345 { 1346 struct sk_buff *skb, *tmp; 1347 unsigned long flags; 1348 1349 skb_queue_walk_safe(skbs, skb, tmp) { 1350 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1351 int q = info->hw_queue; 1352 1353 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1354 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1355 __skb_unlink(skb, skbs); 1356 ieee80211_free_txskb(&local->hw, skb); 1357 continue; 1358 } 1359 #endif 1360 1361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1362 if (local->queue_stop_reasons[q] || 1363 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1364 if (unlikely(info->flags & 1365 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1366 if (local->queue_stop_reasons[q] & 1367 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1368 /* 1369 * Drop off-channel frames if queues 1370 * are stopped for any reason other 1371 * than off-channel operation. Never 1372 * queue them. 1373 */ 1374 spin_unlock_irqrestore( 1375 &local->queue_stop_reason_lock, 1376 flags); 1377 ieee80211_purge_tx_queue(&local->hw, 1378 skbs); 1379 return true; 1380 } 1381 } else { 1382 1383 /* 1384 * Since queue is stopped, queue up frames for 1385 * later transmission from the tx-pending 1386 * tasklet when the queue is woken again. 1387 */ 1388 if (txpending) 1389 skb_queue_splice_init(skbs, 1390 &local->pending[q]); 1391 else 1392 skb_queue_splice_tail_init(skbs, 1393 &local->pending[q]); 1394 1395 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1396 flags); 1397 return false; 1398 } 1399 } 1400 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1401 1402 info->control.vif = vif; 1403 1404 __skb_unlink(skb, skbs); 1405 ieee80211_drv_tx(local, vif, sta, skb); 1406 } 1407 1408 return true; 1409 } 1410 1411 /* 1412 * Returns false if the frame couldn't be transmitted but was queued instead. 1413 */ 1414 static bool __ieee80211_tx(struct ieee80211_local *local, 1415 struct sk_buff_head *skbs, int led_len, 1416 struct sta_info *sta, bool txpending) 1417 { 1418 struct ieee80211_tx_info *info; 1419 struct ieee80211_sub_if_data *sdata; 1420 struct ieee80211_vif *vif; 1421 struct ieee80211_sta *pubsta; 1422 struct sk_buff *skb; 1423 bool result = true; 1424 __le16 fc; 1425 1426 if (WARN_ON(skb_queue_empty(skbs))) 1427 return true; 1428 1429 skb = skb_peek(skbs); 1430 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1431 info = IEEE80211_SKB_CB(skb); 1432 sdata = vif_to_sdata(info->control.vif); 1433 if (sta && !sta->uploaded) 1434 sta = NULL; 1435 1436 if (sta) 1437 pubsta = &sta->sta; 1438 else 1439 pubsta = NULL; 1440 1441 switch (sdata->vif.type) { 1442 case NL80211_IFTYPE_MONITOR: 1443 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1444 vif = &sdata->vif; 1445 break; 1446 } 1447 sdata = rcu_dereference(local->monitor_sdata); 1448 if (sdata) { 1449 vif = &sdata->vif; 1450 info->hw_queue = 1451 vif->hw_queue[skb_get_queue_mapping(skb)]; 1452 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1453 ieee80211_purge_tx_queue(&local->hw, skbs); 1454 return true; 1455 } else 1456 vif = NULL; 1457 break; 1458 case NL80211_IFTYPE_AP_VLAN: 1459 sdata = container_of(sdata->bss, 1460 struct ieee80211_sub_if_data, u.ap); 1461 /* fall through */ 1462 default: 1463 vif = &sdata->vif; 1464 break; 1465 } 1466 1467 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1468 txpending); 1469 1470 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1471 1472 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1473 1474 return result; 1475 } 1476 1477 /* 1478 * Invoke TX handlers, return 0 on success and non-zero if the 1479 * frame was dropped or queued. 1480 */ 1481 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1482 { 1483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1484 ieee80211_tx_result res = TX_DROP; 1485 1486 #define CALL_TXH(txh) \ 1487 do { \ 1488 res = txh(tx); \ 1489 if (res != TX_CONTINUE) \ 1490 goto txh_done; \ 1491 } while (0) 1492 1493 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1494 CALL_TXH(ieee80211_tx_h_check_assoc); 1495 CALL_TXH(ieee80211_tx_h_ps_buf); 1496 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1497 CALL_TXH(ieee80211_tx_h_select_key); 1498 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1499 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1500 1501 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1502 __skb_queue_tail(&tx->skbs, tx->skb); 1503 tx->skb = NULL; 1504 goto txh_done; 1505 } 1506 1507 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1508 CALL_TXH(ieee80211_tx_h_sequence); 1509 CALL_TXH(ieee80211_tx_h_fragment); 1510 /* handlers after fragment must be aware of tx info fragmentation! */ 1511 CALL_TXH(ieee80211_tx_h_stats); 1512 CALL_TXH(ieee80211_tx_h_encrypt); 1513 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1514 CALL_TXH(ieee80211_tx_h_calculate_duration); 1515 #undef CALL_TXH 1516 1517 txh_done: 1518 if (unlikely(res == TX_DROP)) { 1519 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1520 if (tx->skb) 1521 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1522 else 1523 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1524 return -1; 1525 } else if (unlikely(res == TX_QUEUED)) { 1526 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1527 return -1; 1528 } 1529 1530 return 0; 1531 } 1532 1533 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1534 struct ieee80211_vif *vif, struct sk_buff *skb, 1535 int band, struct ieee80211_sta **sta) 1536 { 1537 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1539 struct ieee80211_tx_data tx; 1540 struct sk_buff *skb2; 1541 1542 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1543 return false; 1544 1545 info->band = band; 1546 info->control.vif = vif; 1547 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1548 1549 if (invoke_tx_handlers(&tx)) 1550 return false; 1551 1552 if (sta) { 1553 if (tx.sta) 1554 *sta = &tx.sta->sta; 1555 else 1556 *sta = NULL; 1557 } 1558 1559 /* this function isn't suitable for fragmented data frames */ 1560 skb2 = __skb_dequeue(&tx.skbs); 1561 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1562 ieee80211_free_txskb(hw, skb2); 1563 ieee80211_purge_tx_queue(hw, &tx.skbs); 1564 return false; 1565 } 1566 1567 return true; 1568 } 1569 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1570 1571 /* 1572 * Returns false if the frame couldn't be transmitted but was queued instead. 1573 */ 1574 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1575 struct sta_info *sta, struct sk_buff *skb, 1576 bool txpending) 1577 { 1578 struct ieee80211_local *local = sdata->local; 1579 struct ieee80211_tx_data tx; 1580 ieee80211_tx_result res_prepare; 1581 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1582 bool result = true; 1583 int led_len; 1584 1585 if (unlikely(skb->len < 10)) { 1586 dev_kfree_skb(skb); 1587 return true; 1588 } 1589 1590 /* initialises tx */ 1591 led_len = skb->len; 1592 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1593 1594 if (unlikely(res_prepare == TX_DROP)) { 1595 ieee80211_free_txskb(&local->hw, skb); 1596 return true; 1597 } else if (unlikely(res_prepare == TX_QUEUED)) { 1598 return true; 1599 } 1600 1601 /* set up hw_queue value early */ 1602 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1603 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1604 info->hw_queue = 1605 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1606 1607 if (!invoke_tx_handlers(&tx)) 1608 result = __ieee80211_tx(local, &tx.skbs, led_len, 1609 tx.sta, txpending); 1610 1611 return result; 1612 } 1613 1614 /* device xmit handlers */ 1615 1616 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1617 struct sk_buff *skb, 1618 int head_need, bool may_encrypt) 1619 { 1620 struct ieee80211_local *local = sdata->local; 1621 int tail_need = 0; 1622 1623 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1624 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1625 tail_need -= skb_tailroom(skb); 1626 tail_need = max_t(int, tail_need, 0); 1627 } 1628 1629 if (skb_cloned(skb) && 1630 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1631 !skb_clone_writable(skb, ETH_HLEN) || 1632 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1633 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1634 else if (head_need || tail_need) 1635 I802_DEBUG_INC(local->tx_expand_skb_head); 1636 else 1637 return 0; 1638 1639 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1640 wiphy_debug(local->hw.wiphy, 1641 "failed to reallocate TX buffer\n"); 1642 return -ENOMEM; 1643 } 1644 1645 return 0; 1646 } 1647 1648 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1649 struct sta_info *sta, struct sk_buff *skb) 1650 { 1651 struct ieee80211_local *local = sdata->local; 1652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1653 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1654 int headroom; 1655 bool may_encrypt; 1656 1657 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1658 1659 headroom = local->tx_headroom; 1660 if (may_encrypt) 1661 headroom += sdata->encrypt_headroom; 1662 headroom -= skb_headroom(skb); 1663 headroom = max_t(int, 0, headroom); 1664 1665 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1666 ieee80211_free_txskb(&local->hw, skb); 1667 return; 1668 } 1669 1670 hdr = (struct ieee80211_hdr *) skb->data; 1671 info->control.vif = &sdata->vif; 1672 1673 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1674 if (ieee80211_is_data(hdr->frame_control) && 1675 is_unicast_ether_addr(hdr->addr1)) { 1676 if (mesh_nexthop_resolve(sdata, skb)) 1677 return; /* skb queued: don't free */ 1678 } else { 1679 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1680 } 1681 } 1682 1683 ieee80211_set_qos_hdr(sdata, skb); 1684 ieee80211_tx(sdata, sta, skb, false); 1685 } 1686 1687 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1688 struct sk_buff *skb) 1689 { 1690 struct ieee80211_radiotap_iterator iterator; 1691 struct ieee80211_radiotap_header *rthdr = 1692 (struct ieee80211_radiotap_header *) skb->data; 1693 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1694 struct ieee80211_supported_band *sband = 1695 local->hw.wiphy->bands[info->band]; 1696 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1697 NULL); 1698 u16 txflags; 1699 u16 rate = 0; 1700 bool rate_found = false; 1701 u8 rate_retries = 0; 1702 u16 rate_flags = 0; 1703 u8 mcs_known, mcs_flags, mcs_bw; 1704 u16 vht_known; 1705 u8 vht_mcs = 0, vht_nss = 0; 1706 int i; 1707 1708 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1709 IEEE80211_TX_CTL_DONTFRAG; 1710 1711 /* 1712 * for every radiotap entry that is present 1713 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1714 * entries present, or -EINVAL on error) 1715 */ 1716 1717 while (!ret) { 1718 ret = ieee80211_radiotap_iterator_next(&iterator); 1719 1720 if (ret) 1721 continue; 1722 1723 /* see if this argument is something we can use */ 1724 switch (iterator.this_arg_index) { 1725 /* 1726 * You must take care when dereferencing iterator.this_arg 1727 * for multibyte types... the pointer is not aligned. Use 1728 * get_unaligned((type *)iterator.this_arg) to dereference 1729 * iterator.this_arg for type "type" safely on all arches. 1730 */ 1731 case IEEE80211_RADIOTAP_FLAGS: 1732 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1733 /* 1734 * this indicates that the skb we have been 1735 * handed has the 32-bit FCS CRC at the end... 1736 * we should react to that by snipping it off 1737 * because it will be recomputed and added 1738 * on transmission 1739 */ 1740 if (skb->len < (iterator._max_length + FCS_LEN)) 1741 return false; 1742 1743 skb_trim(skb, skb->len - FCS_LEN); 1744 } 1745 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1746 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1747 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1748 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1749 break; 1750 1751 case IEEE80211_RADIOTAP_TX_FLAGS: 1752 txflags = get_unaligned_le16(iterator.this_arg); 1753 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1754 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1755 break; 1756 1757 case IEEE80211_RADIOTAP_RATE: 1758 rate = *iterator.this_arg; 1759 rate_flags = 0; 1760 rate_found = true; 1761 break; 1762 1763 case IEEE80211_RADIOTAP_DATA_RETRIES: 1764 rate_retries = *iterator.this_arg; 1765 break; 1766 1767 case IEEE80211_RADIOTAP_MCS: 1768 mcs_known = iterator.this_arg[0]; 1769 mcs_flags = iterator.this_arg[1]; 1770 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 1771 break; 1772 1773 rate_found = true; 1774 rate = iterator.this_arg[2]; 1775 rate_flags = IEEE80211_TX_RC_MCS; 1776 1777 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 1778 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 1779 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1780 1781 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 1782 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 1783 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 1784 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 1785 break; 1786 1787 case IEEE80211_RADIOTAP_VHT: 1788 vht_known = get_unaligned_le16(iterator.this_arg); 1789 rate_found = true; 1790 1791 rate_flags = IEEE80211_TX_RC_VHT_MCS; 1792 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 1793 (iterator.this_arg[2] & 1794 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 1795 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1796 if (vht_known & 1797 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 1798 if (iterator.this_arg[3] == 1) 1799 rate_flags |= 1800 IEEE80211_TX_RC_40_MHZ_WIDTH; 1801 else if (iterator.this_arg[3] == 4) 1802 rate_flags |= 1803 IEEE80211_TX_RC_80_MHZ_WIDTH; 1804 else if (iterator.this_arg[3] == 11) 1805 rate_flags |= 1806 IEEE80211_TX_RC_160_MHZ_WIDTH; 1807 } 1808 1809 vht_mcs = iterator.this_arg[4] >> 4; 1810 vht_nss = iterator.this_arg[4] & 0xF; 1811 break; 1812 1813 /* 1814 * Please update the file 1815 * Documentation/networking/mac80211-injection.txt 1816 * when parsing new fields here. 1817 */ 1818 1819 default: 1820 break; 1821 } 1822 } 1823 1824 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1825 return false; 1826 1827 if (rate_found) { 1828 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 1829 1830 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 1831 info->control.rates[i].idx = -1; 1832 info->control.rates[i].flags = 0; 1833 info->control.rates[i].count = 0; 1834 } 1835 1836 if (rate_flags & IEEE80211_TX_RC_MCS) { 1837 info->control.rates[0].idx = rate; 1838 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 1839 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 1840 vht_nss); 1841 } else { 1842 for (i = 0; i < sband->n_bitrates; i++) { 1843 if (rate * 5 != sband->bitrates[i].bitrate) 1844 continue; 1845 1846 info->control.rates[0].idx = i; 1847 break; 1848 } 1849 } 1850 1851 if (info->control.rates[0].idx < 0) 1852 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 1853 1854 info->control.rates[0].flags = rate_flags; 1855 info->control.rates[0].count = min_t(u8, rate_retries + 1, 1856 local->hw.max_rate_tries); 1857 } 1858 1859 /* 1860 * remove the radiotap header 1861 * iterator->_max_length was sanity-checked against 1862 * skb->len by iterator init 1863 */ 1864 skb_pull(skb, iterator._max_length); 1865 1866 return true; 1867 } 1868 1869 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1870 struct net_device *dev) 1871 { 1872 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1873 struct ieee80211_chanctx_conf *chanctx_conf; 1874 struct ieee80211_radiotap_header *prthdr = 1875 (struct ieee80211_radiotap_header *)skb->data; 1876 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1877 struct ieee80211_hdr *hdr; 1878 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1879 struct cfg80211_chan_def *chandef; 1880 u16 len_rthdr; 1881 int hdrlen; 1882 1883 /* check for not even having the fixed radiotap header part */ 1884 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1885 goto fail; /* too short to be possibly valid */ 1886 1887 /* is it a header version we can trust to find length from? */ 1888 if (unlikely(prthdr->it_version)) 1889 goto fail; /* only version 0 is supported */ 1890 1891 /* then there must be a radiotap header with a length we can use */ 1892 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1893 1894 /* does the skb contain enough to deliver on the alleged length? */ 1895 if (unlikely(skb->len < len_rthdr)) 1896 goto fail; /* skb too short for claimed rt header extent */ 1897 1898 /* 1899 * fix up the pointers accounting for the radiotap 1900 * header still being in there. We are being given 1901 * a precooked IEEE80211 header so no need for 1902 * normal processing 1903 */ 1904 skb_set_mac_header(skb, len_rthdr); 1905 /* 1906 * these are just fixed to the end of the rt area since we 1907 * don't have any better information and at this point, nobody cares 1908 */ 1909 skb_set_network_header(skb, len_rthdr); 1910 skb_set_transport_header(skb, len_rthdr); 1911 1912 if (skb->len < len_rthdr + 2) 1913 goto fail; 1914 1915 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1916 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1917 1918 if (skb->len < len_rthdr + hdrlen) 1919 goto fail; 1920 1921 /* 1922 * Initialize skb->protocol if the injected frame is a data frame 1923 * carrying a rfc1042 header 1924 */ 1925 if (ieee80211_is_data(hdr->frame_control) && 1926 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1927 u8 *payload = (u8 *)hdr + hdrlen; 1928 1929 if (ether_addr_equal(payload, rfc1042_header)) 1930 skb->protocol = cpu_to_be16((payload[6] << 8) | 1931 payload[7]); 1932 } 1933 1934 memset(info, 0, sizeof(*info)); 1935 1936 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1937 IEEE80211_TX_CTL_INJECTED; 1938 1939 rcu_read_lock(); 1940 1941 /* 1942 * We process outgoing injected frames that have a local address 1943 * we handle as though they are non-injected frames. 1944 * This code here isn't entirely correct, the local MAC address 1945 * isn't always enough to find the interface to use; for proper 1946 * VLAN/WDS support we will need a different mechanism (which 1947 * likely isn't going to be monitor interfaces). 1948 */ 1949 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1950 1951 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1952 if (!ieee80211_sdata_running(tmp_sdata)) 1953 continue; 1954 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1955 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1956 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1957 continue; 1958 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1959 sdata = tmp_sdata; 1960 break; 1961 } 1962 } 1963 1964 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1965 if (!chanctx_conf) { 1966 tmp_sdata = rcu_dereference(local->monitor_sdata); 1967 if (tmp_sdata) 1968 chanctx_conf = 1969 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1970 } 1971 1972 if (chanctx_conf) 1973 chandef = &chanctx_conf->def; 1974 else if (!local->use_chanctx) 1975 chandef = &local->_oper_chandef; 1976 else 1977 goto fail_rcu; 1978 1979 /* 1980 * Frame injection is not allowed if beaconing is not allowed 1981 * or if we need radar detection. Beaconing is usually not allowed when 1982 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1983 * Passive scan is also used in world regulatory domains where 1984 * your country is not known and as such it should be treated as 1985 * NO TX unless the channel is explicitly allowed in which case 1986 * your current regulatory domain would not have the passive scan 1987 * flag. 1988 * 1989 * Since AP mode uses monitor interfaces to inject/TX management 1990 * frames we can make AP mode the exception to this rule once it 1991 * supports radar detection as its implementation can deal with 1992 * radar detection by itself. We can do that later by adding a 1993 * monitor flag interfaces used for AP support. 1994 */ 1995 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1996 sdata->vif.type)) 1997 goto fail_rcu; 1998 1999 info->band = chandef->chan->band; 2000 2001 /* process and remove the injection radiotap header */ 2002 if (!ieee80211_parse_tx_radiotap(local, skb)) 2003 goto fail_rcu; 2004 2005 ieee80211_xmit(sdata, NULL, skb); 2006 rcu_read_unlock(); 2007 2008 return NETDEV_TX_OK; 2009 2010 fail_rcu: 2011 rcu_read_unlock(); 2012 fail: 2013 dev_kfree_skb(skb); 2014 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2015 } 2016 2017 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2018 { 2019 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2020 2021 return ethertype == ETH_P_TDLS && 2022 skb->len > 14 && 2023 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2024 } 2025 2026 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2027 struct sk_buff *skb, 2028 struct sta_info **sta_out) 2029 { 2030 struct sta_info *sta; 2031 2032 switch (sdata->vif.type) { 2033 case NL80211_IFTYPE_AP_VLAN: 2034 sta = rcu_dereference(sdata->u.vlan.sta); 2035 if (sta) { 2036 *sta_out = sta; 2037 return 0; 2038 } else if (sdata->wdev.use_4addr) { 2039 return -ENOLINK; 2040 } 2041 /* fall through */ 2042 case NL80211_IFTYPE_AP: 2043 case NL80211_IFTYPE_OCB: 2044 case NL80211_IFTYPE_ADHOC: 2045 if (is_multicast_ether_addr(skb->data)) { 2046 *sta_out = ERR_PTR(-ENOENT); 2047 return 0; 2048 } 2049 sta = sta_info_get_bss(sdata, skb->data); 2050 break; 2051 case NL80211_IFTYPE_WDS: 2052 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2053 break; 2054 #ifdef CONFIG_MAC80211_MESH 2055 case NL80211_IFTYPE_MESH_POINT: 2056 /* determined much later */ 2057 *sta_out = NULL; 2058 return 0; 2059 #endif 2060 case NL80211_IFTYPE_STATION: 2061 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2062 sta = sta_info_get(sdata, skb->data); 2063 if (sta) { 2064 bool tdls_peer, tdls_auth; 2065 2066 tdls_peer = test_sta_flag(sta, 2067 WLAN_STA_TDLS_PEER); 2068 tdls_auth = test_sta_flag(sta, 2069 WLAN_STA_TDLS_PEER_AUTH); 2070 2071 if (tdls_peer && tdls_auth) { 2072 *sta_out = sta; 2073 return 0; 2074 } 2075 2076 /* 2077 * TDLS link during setup - throw out frames to 2078 * peer. Allow TDLS-setup frames to unauthorized 2079 * peers for the special case of a link teardown 2080 * after a TDLS sta is removed due to being 2081 * unreachable. 2082 */ 2083 if (tdls_peer && !tdls_auth && 2084 !ieee80211_is_tdls_setup(skb)) 2085 return -EINVAL; 2086 } 2087 2088 } 2089 2090 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2091 if (!sta) 2092 return -ENOLINK; 2093 break; 2094 default: 2095 return -EINVAL; 2096 } 2097 2098 *sta_out = sta ?: ERR_PTR(-ENOENT); 2099 return 0; 2100 } 2101 2102 /** 2103 * ieee80211_build_hdr - build 802.11 header in the given frame 2104 * @sdata: virtual interface to build the header for 2105 * @skb: the skb to build the header in 2106 * @info_flags: skb flags to set 2107 * 2108 * This function takes the skb with 802.3 header and reformats the header to 2109 * the appropriate IEEE 802.11 header based on which interface the packet is 2110 * being transmitted on. 2111 * 2112 * Note that this function also takes care of the TX status request and 2113 * potential unsharing of the SKB - this needs to be interleaved with the 2114 * header building. 2115 * 2116 * The function requires the read-side RCU lock held 2117 * 2118 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2119 */ 2120 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2121 struct sk_buff *skb, u32 info_flags, 2122 struct sta_info *sta) 2123 { 2124 struct ieee80211_local *local = sdata->local; 2125 struct ieee80211_tx_info *info; 2126 int head_need; 2127 u16 ethertype, hdrlen, meshhdrlen = 0; 2128 __le16 fc; 2129 struct ieee80211_hdr hdr; 2130 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2131 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2132 const u8 *encaps_data; 2133 int encaps_len, skip_header_bytes; 2134 int nh_pos, h_pos; 2135 bool wme_sta = false, authorized = false; 2136 bool tdls_peer; 2137 bool multicast; 2138 u16 info_id = 0; 2139 struct ieee80211_chanctx_conf *chanctx_conf; 2140 struct ieee80211_sub_if_data *ap_sdata; 2141 enum nl80211_band band; 2142 int ret; 2143 2144 if (IS_ERR(sta)) 2145 sta = NULL; 2146 2147 /* convert Ethernet header to proper 802.11 header (based on 2148 * operation mode) */ 2149 ethertype = (skb->data[12] << 8) | skb->data[13]; 2150 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2151 2152 switch (sdata->vif.type) { 2153 case NL80211_IFTYPE_AP_VLAN: 2154 if (sdata->wdev.use_4addr) { 2155 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2156 /* RA TA DA SA */ 2157 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2158 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2159 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2160 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2161 hdrlen = 30; 2162 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2163 wme_sta = sta->sta.wme; 2164 } 2165 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2166 u.ap); 2167 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2168 if (!chanctx_conf) { 2169 ret = -ENOTCONN; 2170 goto free; 2171 } 2172 band = chanctx_conf->def.chan->band; 2173 if (sdata->wdev.use_4addr) 2174 break; 2175 /* fall through */ 2176 case NL80211_IFTYPE_AP: 2177 if (sdata->vif.type == NL80211_IFTYPE_AP) 2178 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2179 if (!chanctx_conf) { 2180 ret = -ENOTCONN; 2181 goto free; 2182 } 2183 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2184 /* DA BSSID SA */ 2185 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2186 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2187 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2188 hdrlen = 24; 2189 band = chanctx_conf->def.chan->band; 2190 break; 2191 case NL80211_IFTYPE_WDS: 2192 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2193 /* RA TA DA SA */ 2194 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2195 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2196 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2197 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2198 hdrlen = 30; 2199 /* 2200 * This is the exception! WDS style interfaces are prohibited 2201 * when channel contexts are in used so this must be valid 2202 */ 2203 band = local->hw.conf.chandef.chan->band; 2204 break; 2205 #ifdef CONFIG_MAC80211_MESH 2206 case NL80211_IFTYPE_MESH_POINT: 2207 if (!is_multicast_ether_addr(skb->data)) { 2208 struct sta_info *next_hop; 2209 bool mpp_lookup = true; 2210 2211 mpath = mesh_path_lookup(sdata, skb->data); 2212 if (mpath) { 2213 mpp_lookup = false; 2214 next_hop = rcu_dereference(mpath->next_hop); 2215 if (!next_hop || 2216 !(mpath->flags & (MESH_PATH_ACTIVE | 2217 MESH_PATH_RESOLVING))) 2218 mpp_lookup = true; 2219 } 2220 2221 if (mpp_lookup) { 2222 mppath = mpp_path_lookup(sdata, skb->data); 2223 if (mppath) 2224 mppath->exp_time = jiffies; 2225 } 2226 2227 if (mppath && mpath) 2228 mesh_path_del(sdata, mpath->dst); 2229 } 2230 2231 /* 2232 * Use address extension if it is a packet from 2233 * another interface or if we know the destination 2234 * is being proxied by a portal (i.e. portal address 2235 * differs from proxied address) 2236 */ 2237 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2238 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2239 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2240 skb->data, skb->data + ETH_ALEN); 2241 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2242 NULL, NULL); 2243 } else { 2244 /* DS -> MBSS (802.11-2012 13.11.3.3). 2245 * For unicast with unknown forwarding information, 2246 * destination might be in the MBSS or if that fails 2247 * forwarded to another mesh gate. In either case 2248 * resolution will be handled in ieee80211_xmit(), so 2249 * leave the original DA. This also works for mcast */ 2250 const u8 *mesh_da = skb->data; 2251 2252 if (mppath) 2253 mesh_da = mppath->mpp; 2254 else if (mpath) 2255 mesh_da = mpath->dst; 2256 2257 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2258 mesh_da, sdata->vif.addr); 2259 if (is_multicast_ether_addr(mesh_da)) 2260 /* DA TA mSA AE:SA */ 2261 meshhdrlen = ieee80211_new_mesh_header( 2262 sdata, &mesh_hdr, 2263 skb->data + ETH_ALEN, NULL); 2264 else 2265 /* RA TA mDA mSA AE:DA SA */ 2266 meshhdrlen = ieee80211_new_mesh_header( 2267 sdata, &mesh_hdr, skb->data, 2268 skb->data + ETH_ALEN); 2269 2270 } 2271 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2272 if (!chanctx_conf) { 2273 ret = -ENOTCONN; 2274 goto free; 2275 } 2276 band = chanctx_conf->def.chan->band; 2277 break; 2278 #endif 2279 case NL80211_IFTYPE_STATION: 2280 /* we already did checks when looking up the RA STA */ 2281 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2282 2283 if (tdls_peer) { 2284 /* DA SA BSSID */ 2285 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2286 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2287 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2288 hdrlen = 24; 2289 } else if (sdata->u.mgd.use_4addr && 2290 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2291 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2292 IEEE80211_FCTL_TODS); 2293 /* RA TA DA SA */ 2294 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2295 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2296 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2297 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2298 hdrlen = 30; 2299 } else { 2300 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2301 /* BSSID SA DA */ 2302 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2303 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2304 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2305 hdrlen = 24; 2306 } 2307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2308 if (!chanctx_conf) { 2309 ret = -ENOTCONN; 2310 goto free; 2311 } 2312 band = chanctx_conf->def.chan->band; 2313 break; 2314 case NL80211_IFTYPE_OCB: 2315 /* DA SA BSSID */ 2316 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2317 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2318 eth_broadcast_addr(hdr.addr3); 2319 hdrlen = 24; 2320 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2321 if (!chanctx_conf) { 2322 ret = -ENOTCONN; 2323 goto free; 2324 } 2325 band = chanctx_conf->def.chan->band; 2326 break; 2327 case NL80211_IFTYPE_ADHOC: 2328 /* DA SA BSSID */ 2329 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2330 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2331 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2332 hdrlen = 24; 2333 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2334 if (!chanctx_conf) { 2335 ret = -ENOTCONN; 2336 goto free; 2337 } 2338 band = chanctx_conf->def.chan->band; 2339 break; 2340 default: 2341 ret = -EINVAL; 2342 goto free; 2343 } 2344 2345 multicast = is_multicast_ether_addr(hdr.addr1); 2346 2347 /* sta is always NULL for mesh */ 2348 if (sta) { 2349 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2350 wme_sta = sta->sta.wme; 2351 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2352 /* For mesh, the use of the QoS header is mandatory */ 2353 wme_sta = true; 2354 } 2355 2356 /* receiver does QoS (which also means we do) use it */ 2357 if (wme_sta) { 2358 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2359 hdrlen += 2; 2360 } 2361 2362 /* 2363 * Drop unicast frames to unauthorised stations unless they are 2364 * EAPOL frames from the local station. 2365 */ 2366 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2367 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2368 !multicast && !authorized && 2369 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2370 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2371 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2372 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2373 sdata->name, hdr.addr1); 2374 #endif 2375 2376 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2377 2378 ret = -EPERM; 2379 goto free; 2380 } 2381 2382 if (unlikely(!multicast && skb->sk && 2383 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2384 struct sk_buff *ack_skb = skb_clone_sk(skb); 2385 2386 if (ack_skb) { 2387 unsigned long flags; 2388 int id; 2389 2390 spin_lock_irqsave(&local->ack_status_lock, flags); 2391 id = idr_alloc(&local->ack_status_frames, ack_skb, 2392 1, 0x10000, GFP_ATOMIC); 2393 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2394 2395 if (id >= 0) { 2396 info_id = id; 2397 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2398 } else { 2399 kfree_skb(ack_skb); 2400 } 2401 } 2402 } 2403 2404 /* 2405 * If the skb is shared we need to obtain our own copy. 2406 */ 2407 if (skb_shared(skb)) { 2408 struct sk_buff *tmp_skb = skb; 2409 2410 /* can't happen -- skb is a clone if info_id != 0 */ 2411 WARN_ON(info_id); 2412 2413 skb = skb_clone(skb, GFP_ATOMIC); 2414 kfree_skb(tmp_skb); 2415 2416 if (!skb) { 2417 ret = -ENOMEM; 2418 goto free; 2419 } 2420 } 2421 2422 hdr.frame_control = fc; 2423 hdr.duration_id = 0; 2424 hdr.seq_ctrl = 0; 2425 2426 skip_header_bytes = ETH_HLEN; 2427 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2428 encaps_data = bridge_tunnel_header; 2429 encaps_len = sizeof(bridge_tunnel_header); 2430 skip_header_bytes -= 2; 2431 } else if (ethertype >= ETH_P_802_3_MIN) { 2432 encaps_data = rfc1042_header; 2433 encaps_len = sizeof(rfc1042_header); 2434 skip_header_bytes -= 2; 2435 } else { 2436 encaps_data = NULL; 2437 encaps_len = 0; 2438 } 2439 2440 nh_pos = skb_network_header(skb) - skb->data; 2441 h_pos = skb_transport_header(skb) - skb->data; 2442 2443 skb_pull(skb, skip_header_bytes); 2444 nh_pos -= skip_header_bytes; 2445 h_pos -= skip_header_bytes; 2446 2447 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2448 2449 /* 2450 * So we need to modify the skb header and hence need a copy of 2451 * that. The head_need variable above doesn't, so far, include 2452 * the needed header space that we don't need right away. If we 2453 * can, then we don't reallocate right now but only after the 2454 * frame arrives at the master device (if it does...) 2455 * 2456 * If we cannot, however, then we will reallocate to include all 2457 * the ever needed space. Also, if we need to reallocate it anyway, 2458 * make it big enough for everything we may ever need. 2459 */ 2460 2461 if (head_need > 0 || skb_cloned(skb)) { 2462 head_need += sdata->encrypt_headroom; 2463 head_need += local->tx_headroom; 2464 head_need = max_t(int, 0, head_need); 2465 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2466 ieee80211_free_txskb(&local->hw, skb); 2467 skb = NULL; 2468 return ERR_PTR(-ENOMEM); 2469 } 2470 } 2471 2472 if (encaps_data) { 2473 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2474 nh_pos += encaps_len; 2475 h_pos += encaps_len; 2476 } 2477 2478 #ifdef CONFIG_MAC80211_MESH 2479 if (meshhdrlen > 0) { 2480 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2481 nh_pos += meshhdrlen; 2482 h_pos += meshhdrlen; 2483 } 2484 #endif 2485 2486 if (ieee80211_is_data_qos(fc)) { 2487 __le16 *qos_control; 2488 2489 qos_control = (__le16 *) skb_push(skb, 2); 2490 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2491 /* 2492 * Maybe we could actually set some fields here, for now just 2493 * initialise to zero to indicate no special operation. 2494 */ 2495 *qos_control = 0; 2496 } else 2497 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2498 2499 nh_pos += hdrlen; 2500 h_pos += hdrlen; 2501 2502 /* Update skb pointers to various headers since this modified frame 2503 * is going to go through Linux networking code that may potentially 2504 * need things like pointer to IP header. */ 2505 skb_reset_mac_header(skb); 2506 skb_set_network_header(skb, nh_pos); 2507 skb_set_transport_header(skb, h_pos); 2508 2509 info = IEEE80211_SKB_CB(skb); 2510 memset(info, 0, sizeof(*info)); 2511 2512 info->flags = info_flags; 2513 info->ack_frame_id = info_id; 2514 info->band = band; 2515 2516 return skb; 2517 free: 2518 kfree_skb(skb); 2519 return ERR_PTR(ret); 2520 } 2521 2522 /* 2523 * fast-xmit overview 2524 * 2525 * The core idea of this fast-xmit is to remove per-packet checks by checking 2526 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2527 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2528 * much less work can be done per packet. For example, fragmentation must be 2529 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2530 * in the code here. 2531 * 2532 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2533 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2534 * 2535 * The most difficult part of this is that when any of these assumptions 2536 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2537 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2538 * since the per-packet code no longer checks the conditions. This is reflected 2539 * by the calls to these functions throughout the rest of the code, and must be 2540 * maintained if any of the TX path checks change. 2541 */ 2542 2543 void ieee80211_check_fast_xmit(struct sta_info *sta) 2544 { 2545 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2546 struct ieee80211_local *local = sta->local; 2547 struct ieee80211_sub_if_data *sdata = sta->sdata; 2548 struct ieee80211_hdr *hdr = (void *)build.hdr; 2549 struct ieee80211_chanctx_conf *chanctx_conf; 2550 __le16 fc; 2551 2552 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2553 return; 2554 2555 /* Locking here protects both the pointer itself, and against concurrent 2556 * invocations winning data access races to, e.g., the key pointer that 2557 * is used. 2558 * Without it, the invocation of this function right after the key 2559 * pointer changes wouldn't be sufficient, as another CPU could access 2560 * the pointer, then stall, and then do the cache update after the CPU 2561 * that invalidated the key. 2562 * With the locking, such scenarios cannot happen as the check for the 2563 * key and the fast-tx assignment are done atomically, so the CPU that 2564 * modifies the key will either wait or other one will see the key 2565 * cleared/changed already. 2566 */ 2567 spin_lock_bh(&sta->lock); 2568 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2569 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2570 sdata->vif.type == NL80211_IFTYPE_STATION) 2571 goto out; 2572 2573 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2574 goto out; 2575 2576 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2577 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2578 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2579 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2580 goto out; 2581 2582 if (sdata->noack_map) 2583 goto out; 2584 2585 /* fast-xmit doesn't handle fragmentation at all */ 2586 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2587 !local->ops->set_frag_threshold) 2588 goto out; 2589 2590 rcu_read_lock(); 2591 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2592 if (!chanctx_conf) { 2593 rcu_read_unlock(); 2594 goto out; 2595 } 2596 build.band = chanctx_conf->def.chan->band; 2597 rcu_read_unlock(); 2598 2599 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2600 2601 switch (sdata->vif.type) { 2602 case NL80211_IFTYPE_ADHOC: 2603 /* DA SA BSSID */ 2604 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2605 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2606 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2607 build.hdr_len = 24; 2608 break; 2609 case NL80211_IFTYPE_STATION: 2610 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2611 /* DA SA BSSID */ 2612 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2613 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2614 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2615 build.hdr_len = 24; 2616 break; 2617 } 2618 2619 if (sdata->u.mgd.use_4addr) { 2620 /* non-regular ethertype cannot use the fastpath */ 2621 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2622 IEEE80211_FCTL_TODS); 2623 /* RA TA DA SA */ 2624 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2625 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2626 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2627 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2628 build.hdr_len = 30; 2629 break; 2630 } 2631 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2632 /* BSSID SA DA */ 2633 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2634 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2635 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2636 build.hdr_len = 24; 2637 break; 2638 case NL80211_IFTYPE_AP_VLAN: 2639 if (sdata->wdev.use_4addr) { 2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2641 IEEE80211_FCTL_TODS); 2642 /* RA TA DA SA */ 2643 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2644 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2645 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2646 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2647 build.hdr_len = 30; 2648 break; 2649 } 2650 /* fall through */ 2651 case NL80211_IFTYPE_AP: 2652 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2653 /* DA BSSID SA */ 2654 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2655 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2656 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2657 build.hdr_len = 24; 2658 break; 2659 default: 2660 /* not handled on fast-xmit */ 2661 goto out; 2662 } 2663 2664 if (sta->sta.wme) { 2665 build.hdr_len += 2; 2666 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2667 } 2668 2669 /* We store the key here so there's no point in using rcu_dereference() 2670 * but that's fine because the code that changes the pointers will call 2671 * this function after doing so. For a single CPU that would be enough, 2672 * for multiple see the comment above. 2673 */ 2674 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2675 if (!build.key) 2676 build.key = rcu_access_pointer(sdata->default_unicast_key); 2677 if (build.key) { 2678 bool gen_iv, iv_spc, mmic; 2679 2680 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2681 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2682 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2683 2684 /* don't handle software crypto */ 2685 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2686 goto out; 2687 2688 switch (build.key->conf.cipher) { 2689 case WLAN_CIPHER_SUITE_CCMP: 2690 case WLAN_CIPHER_SUITE_CCMP_256: 2691 /* add fixed key ID */ 2692 if (gen_iv) { 2693 (build.hdr + build.hdr_len)[3] = 2694 0x20 | (build.key->conf.keyidx << 6); 2695 build.pn_offs = build.hdr_len; 2696 } 2697 if (gen_iv || iv_spc) 2698 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2699 break; 2700 case WLAN_CIPHER_SUITE_GCMP: 2701 case WLAN_CIPHER_SUITE_GCMP_256: 2702 /* add fixed key ID */ 2703 if (gen_iv) { 2704 (build.hdr + build.hdr_len)[3] = 2705 0x20 | (build.key->conf.keyidx << 6); 2706 build.pn_offs = build.hdr_len; 2707 } 2708 if (gen_iv || iv_spc) 2709 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2710 break; 2711 case WLAN_CIPHER_SUITE_TKIP: 2712 /* cannot handle MMIC or IV generation in xmit-fast */ 2713 if (mmic || gen_iv) 2714 goto out; 2715 if (iv_spc) 2716 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2717 break; 2718 case WLAN_CIPHER_SUITE_WEP40: 2719 case WLAN_CIPHER_SUITE_WEP104: 2720 /* cannot handle IV generation in fast-xmit */ 2721 if (gen_iv) 2722 goto out; 2723 if (iv_spc) 2724 build.hdr_len += IEEE80211_WEP_IV_LEN; 2725 break; 2726 case WLAN_CIPHER_SUITE_AES_CMAC: 2727 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2728 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2729 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2730 WARN(1, 2731 "management cipher suite 0x%x enabled for data\n", 2732 build.key->conf.cipher); 2733 goto out; 2734 default: 2735 /* we don't know how to generate IVs for this at all */ 2736 if (WARN_ON(gen_iv)) 2737 goto out; 2738 /* pure hardware keys are OK, of course */ 2739 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2740 break; 2741 /* cipher scheme might require space allocation */ 2742 if (iv_spc && 2743 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2744 goto out; 2745 if (iv_spc) 2746 build.hdr_len += build.key->conf.iv_len; 2747 } 2748 2749 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2750 } 2751 2752 hdr->frame_control = fc; 2753 2754 memcpy(build.hdr + build.hdr_len, 2755 rfc1042_header, sizeof(rfc1042_header)); 2756 build.hdr_len += sizeof(rfc1042_header); 2757 2758 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2759 /* if the kmemdup fails, continue w/o fast_tx */ 2760 if (!fast_tx) 2761 goto out; 2762 2763 out: 2764 /* we might have raced against another call to this function */ 2765 old = rcu_dereference_protected(sta->fast_tx, 2766 lockdep_is_held(&sta->lock)); 2767 rcu_assign_pointer(sta->fast_tx, fast_tx); 2768 if (old) 2769 kfree_rcu(old, rcu_head); 2770 spin_unlock_bh(&sta->lock); 2771 } 2772 2773 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2774 { 2775 struct sta_info *sta; 2776 2777 rcu_read_lock(); 2778 list_for_each_entry_rcu(sta, &local->sta_list, list) 2779 ieee80211_check_fast_xmit(sta); 2780 rcu_read_unlock(); 2781 } 2782 2783 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2784 { 2785 struct ieee80211_local *local = sdata->local; 2786 struct sta_info *sta; 2787 2788 rcu_read_lock(); 2789 2790 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2791 if (sdata != sta->sdata && 2792 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2793 continue; 2794 ieee80211_check_fast_xmit(sta); 2795 } 2796 2797 rcu_read_unlock(); 2798 } 2799 2800 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2801 { 2802 struct ieee80211_fast_tx *fast_tx; 2803 2804 spin_lock_bh(&sta->lock); 2805 fast_tx = rcu_dereference_protected(sta->fast_tx, 2806 lockdep_is_held(&sta->lock)); 2807 RCU_INIT_POINTER(sta->fast_tx, NULL); 2808 spin_unlock_bh(&sta->lock); 2809 2810 if (fast_tx) 2811 kfree_rcu(fast_tx, rcu_head); 2812 } 2813 2814 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 2815 struct sk_buff *skb, int headroom, 2816 int *subframe_len) 2817 { 2818 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 2819 int padding = (4 - amsdu_len) & 3; 2820 2821 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 2822 I802_DEBUG_INC(local->tx_expand_skb_head); 2823 2824 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 2825 wiphy_debug(local->hw.wiphy, 2826 "failed to reallocate TX buffer\n"); 2827 return false; 2828 } 2829 } 2830 2831 if (padding) { 2832 *subframe_len += padding; 2833 memset(skb_put(skb, padding), 0, padding); 2834 } 2835 2836 return true; 2837 } 2838 2839 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 2840 struct ieee80211_fast_tx *fast_tx, 2841 struct sk_buff *skb) 2842 { 2843 struct ieee80211_local *local = sdata->local; 2844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2845 struct ieee80211_hdr *hdr; 2846 struct ethhdr amsdu_hdr; 2847 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 2848 int subframe_len = skb->len - hdr_len; 2849 void *data; 2850 u8 *qc; 2851 2852 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 2853 return false; 2854 2855 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 2856 return true; 2857 2858 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr), 2859 &subframe_len)) 2860 return false; 2861 2862 amsdu_hdr.h_proto = cpu_to_be16(subframe_len); 2863 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN); 2864 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN); 2865 2866 data = skb_push(skb, sizeof(amsdu_hdr)); 2867 memmove(data, data + sizeof(amsdu_hdr), hdr_len); 2868 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr)); 2869 2870 hdr = data; 2871 qc = ieee80211_get_qos_ctl(hdr); 2872 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 2873 2874 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 2875 2876 return true; 2877 } 2878 2879 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 2880 struct sta_info *sta, 2881 struct ieee80211_fast_tx *fast_tx, 2882 struct sk_buff *skb) 2883 { 2884 struct ieee80211_local *local = sdata->local; 2885 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2886 struct ieee80211_txq *txq = sta->sta.txq[tid]; 2887 struct txq_info *txqi; 2888 struct sk_buff **frag_tail, *head; 2889 int subframe_len = skb->len - ETH_ALEN; 2890 u8 max_subframes = sta->sta.max_amsdu_subframes; 2891 int max_frags = local->hw.max_tx_fragments; 2892 int max_amsdu_len = sta->sta.max_amsdu_len; 2893 __be16 len; 2894 void *data; 2895 bool ret = false; 2896 int n = 1, nfrags; 2897 2898 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 2899 return false; 2900 2901 if (!txq) 2902 return false; 2903 2904 txqi = to_txq_info(txq); 2905 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 2906 return false; 2907 2908 if (sta->sta.max_rc_amsdu_len) 2909 max_amsdu_len = min_t(int, max_amsdu_len, 2910 sta->sta.max_rc_amsdu_len); 2911 2912 spin_lock_bh(&txqi->queue.lock); 2913 2914 head = skb_peek_tail(&txqi->queue); 2915 if (!head) 2916 goto out; 2917 2918 if (skb->len + head->len > max_amsdu_len) 2919 goto out; 2920 2921 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 2922 goto out; 2923 2924 nfrags = 1 + skb_shinfo(skb)->nr_frags; 2925 nfrags += 1 + skb_shinfo(head)->nr_frags; 2926 frag_tail = &skb_shinfo(head)->frag_list; 2927 while (*frag_tail) { 2928 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 2929 frag_tail = &(*frag_tail)->next; 2930 n++; 2931 } 2932 2933 if (max_subframes && n > max_subframes) 2934 goto out; 2935 2936 if (max_frags && nfrags > max_frags) 2937 goto out; 2938 2939 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 2940 &subframe_len)) 2941 goto out; 2942 2943 ret = true; 2944 data = skb_push(skb, ETH_ALEN + 2); 2945 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 2946 2947 data += 2 * ETH_ALEN; 2948 len = cpu_to_be16(subframe_len); 2949 memcpy(data, &len, 2); 2950 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 2951 2952 head->len += skb->len; 2953 head->data_len += skb->len; 2954 *frag_tail = skb; 2955 2956 out: 2957 spin_unlock_bh(&txqi->queue.lock); 2958 2959 return ret; 2960 } 2961 2962 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2963 struct net_device *dev, struct sta_info *sta, 2964 struct ieee80211_fast_tx *fast_tx, 2965 struct sk_buff *skb) 2966 { 2967 struct ieee80211_local *local = sdata->local; 2968 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2969 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2970 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2971 struct ethhdr eth; 2972 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2973 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2974 struct ieee80211_tx_data tx; 2975 ieee80211_tx_result r; 2976 struct tid_ampdu_tx *tid_tx = NULL; 2977 u8 tid = IEEE80211_NUM_TIDS; 2978 2979 /* control port protocol needs a lot of special handling */ 2980 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2981 return false; 2982 2983 /* only RFC 1042 SNAP */ 2984 if (ethertype < ETH_P_802_3_MIN) 2985 return false; 2986 2987 /* don't handle TX status request here either */ 2988 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2989 return false; 2990 2991 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2992 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2993 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2994 if (tid_tx) { 2995 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2996 return false; 2997 if (tid_tx->timeout) 2998 tid_tx->last_tx = jiffies; 2999 } 3000 } 3001 3002 /* after this point (skb is modified) we cannot return false */ 3003 3004 if (skb_shared(skb)) { 3005 struct sk_buff *tmp_skb = skb; 3006 3007 skb = skb_clone(skb, GFP_ATOMIC); 3008 kfree_skb(tmp_skb); 3009 3010 if (!skb) 3011 return true; 3012 } 3013 3014 ieee80211_tx_stats(dev, skb->len + extra_head); 3015 3016 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3017 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3018 return true; 3019 3020 /* will not be crypto-handled beyond what we do here, so use false 3021 * as the may-encrypt argument for the resize to not account for 3022 * more room than we already have in 'extra_head' 3023 */ 3024 if (unlikely(ieee80211_skb_resize(sdata, skb, 3025 max_t(int, extra_head + hw_headroom - 3026 skb_headroom(skb), 0), 3027 false))) { 3028 kfree_skb(skb); 3029 return true; 3030 } 3031 3032 memcpy(ð, skb->data, ETH_HLEN - 2); 3033 hdr = (void *)skb_push(skb, extra_head); 3034 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3035 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3036 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3037 3038 memset(info, 0, sizeof(*info)); 3039 info->band = fast_tx->band; 3040 info->control.vif = &sdata->vif; 3041 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3042 IEEE80211_TX_CTL_DONTFRAG | 3043 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3044 3045 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3046 *ieee80211_get_qos_ctl(hdr) = tid; 3047 if (!sta->sta.txq[0]) 3048 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3049 } else { 3050 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3051 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3052 sdata->sequence_number += 0x10; 3053 } 3054 3055 if (skb_shinfo(skb)->gso_size) 3056 sta->tx_stats.msdu[tid] += 3057 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3058 else 3059 sta->tx_stats.msdu[tid]++; 3060 3061 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3062 3063 __skb_queue_head_init(&tx.skbs); 3064 3065 tx.flags = IEEE80211_TX_UNICAST; 3066 tx.local = local; 3067 tx.sdata = sdata; 3068 tx.sta = sta; 3069 tx.key = fast_tx->key; 3070 3071 if (fast_tx->key) 3072 info->control.hw_key = &fast_tx->key->conf; 3073 3074 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3075 tx.skb = skb; 3076 r = ieee80211_tx_h_rate_ctrl(&tx); 3077 skb = tx.skb; 3078 tx.skb = NULL; 3079 3080 if (r != TX_CONTINUE) { 3081 if (r != TX_QUEUED) 3082 kfree_skb(skb); 3083 return true; 3084 } 3085 } 3086 3087 /* statistics normally done by ieee80211_tx_h_stats (but that 3088 * has to consider fragmentation, so is more complex) 3089 */ 3090 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3091 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3092 3093 if (fast_tx->pn_offs) { 3094 u64 pn; 3095 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 3096 3097 switch (fast_tx->key->conf.cipher) { 3098 case WLAN_CIPHER_SUITE_CCMP: 3099 case WLAN_CIPHER_SUITE_CCMP_256: 3100 case WLAN_CIPHER_SUITE_GCMP: 3101 case WLAN_CIPHER_SUITE_GCMP_256: 3102 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 3103 crypto_hdr[0] = pn; 3104 crypto_hdr[1] = pn >> 8; 3105 crypto_hdr[4] = pn >> 16; 3106 crypto_hdr[5] = pn >> 24; 3107 crypto_hdr[6] = pn >> 32; 3108 crypto_hdr[7] = pn >> 40; 3109 break; 3110 } 3111 } 3112 3113 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3114 sdata = container_of(sdata->bss, 3115 struct ieee80211_sub_if_data, u.ap); 3116 3117 __skb_queue_tail(&tx.skbs, skb); 3118 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3119 return true; 3120 } 3121 3122 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3123 struct net_device *dev, 3124 u32 info_flags) 3125 { 3126 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3127 struct sta_info *sta; 3128 struct sk_buff *next; 3129 3130 if (unlikely(skb->len < ETH_HLEN)) { 3131 kfree_skb(skb); 3132 return; 3133 } 3134 3135 rcu_read_lock(); 3136 3137 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3138 goto out_free; 3139 3140 if (!IS_ERR_OR_NULL(sta)) { 3141 struct ieee80211_fast_tx *fast_tx; 3142 3143 fast_tx = rcu_dereference(sta->fast_tx); 3144 3145 if (fast_tx && 3146 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 3147 goto out; 3148 } 3149 3150 if (skb_is_gso(skb)) { 3151 struct sk_buff *segs; 3152 3153 segs = skb_gso_segment(skb, 0); 3154 if (IS_ERR(segs)) { 3155 goto out_free; 3156 } else if (segs) { 3157 consume_skb(skb); 3158 skb = segs; 3159 } 3160 } else { 3161 /* we cannot process non-linear frames on this path */ 3162 if (skb_linearize(skb)) { 3163 kfree_skb(skb); 3164 goto out; 3165 } 3166 3167 /* the frame could be fragmented, software-encrypted, and other 3168 * things so we cannot really handle checksum offload with it - 3169 * fix it up in software before we handle anything else. 3170 */ 3171 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3172 skb_set_transport_header(skb, 3173 skb_checksum_start_offset(skb)); 3174 if (skb_checksum_help(skb)) 3175 goto out_free; 3176 } 3177 } 3178 3179 next = skb; 3180 while (next) { 3181 skb = next; 3182 next = skb->next; 3183 3184 skb->prev = NULL; 3185 skb->next = NULL; 3186 3187 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3188 if (IS_ERR(skb)) 3189 goto out; 3190 3191 ieee80211_tx_stats(dev, skb->len); 3192 3193 ieee80211_xmit(sdata, sta, skb); 3194 } 3195 goto out; 3196 out_free: 3197 kfree_skb(skb); 3198 out: 3199 rcu_read_unlock(); 3200 } 3201 3202 /** 3203 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3204 * @skb: packet to be sent 3205 * @dev: incoming interface 3206 * 3207 * On failure skb will be freed. 3208 */ 3209 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3210 struct net_device *dev) 3211 { 3212 __ieee80211_subif_start_xmit(skb, dev, 0); 3213 return NETDEV_TX_OK; 3214 } 3215 3216 struct sk_buff * 3217 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3218 struct sk_buff *skb, u32 info_flags) 3219 { 3220 struct ieee80211_hdr *hdr; 3221 struct ieee80211_tx_data tx = { 3222 .local = sdata->local, 3223 .sdata = sdata, 3224 }; 3225 struct sta_info *sta; 3226 3227 rcu_read_lock(); 3228 3229 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3230 kfree_skb(skb); 3231 skb = ERR_PTR(-EINVAL); 3232 goto out; 3233 } 3234 3235 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3236 if (IS_ERR(skb)) 3237 goto out; 3238 3239 hdr = (void *)skb->data; 3240 tx.sta = sta_info_get(sdata, hdr->addr1); 3241 tx.skb = skb; 3242 3243 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3244 rcu_read_unlock(); 3245 kfree_skb(skb); 3246 return ERR_PTR(-EINVAL); 3247 } 3248 3249 out: 3250 rcu_read_unlock(); 3251 return skb; 3252 } 3253 3254 /* 3255 * ieee80211_clear_tx_pending may not be called in a context where 3256 * it is possible that it packets could come in again. 3257 */ 3258 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3259 { 3260 struct sk_buff *skb; 3261 int i; 3262 3263 for (i = 0; i < local->hw.queues; i++) { 3264 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3265 ieee80211_free_txskb(&local->hw, skb); 3266 } 3267 } 3268 3269 /* 3270 * Returns false if the frame couldn't be transmitted but was queued instead, 3271 * which in this case means re-queued -- take as an indication to stop sending 3272 * more pending frames. 3273 */ 3274 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3275 struct sk_buff *skb) 3276 { 3277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3278 struct ieee80211_sub_if_data *sdata; 3279 struct sta_info *sta; 3280 struct ieee80211_hdr *hdr; 3281 bool result; 3282 struct ieee80211_chanctx_conf *chanctx_conf; 3283 3284 sdata = vif_to_sdata(info->control.vif); 3285 3286 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3287 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3288 if (unlikely(!chanctx_conf)) { 3289 dev_kfree_skb(skb); 3290 return true; 3291 } 3292 info->band = chanctx_conf->def.chan->band; 3293 result = ieee80211_tx(sdata, NULL, skb, true); 3294 } else { 3295 struct sk_buff_head skbs; 3296 3297 __skb_queue_head_init(&skbs); 3298 __skb_queue_tail(&skbs, skb); 3299 3300 hdr = (struct ieee80211_hdr *)skb->data; 3301 sta = sta_info_get(sdata, hdr->addr1); 3302 3303 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3304 } 3305 3306 return result; 3307 } 3308 3309 /* 3310 * Transmit all pending packets. Called from tasklet. 3311 */ 3312 void ieee80211_tx_pending(unsigned long data) 3313 { 3314 struct ieee80211_local *local = (struct ieee80211_local *)data; 3315 unsigned long flags; 3316 int i; 3317 bool txok; 3318 3319 rcu_read_lock(); 3320 3321 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3322 for (i = 0; i < local->hw.queues; i++) { 3323 /* 3324 * If queue is stopped by something other than due to pending 3325 * frames, or we have no pending frames, proceed to next queue. 3326 */ 3327 if (local->queue_stop_reasons[i] || 3328 skb_queue_empty(&local->pending[i])) 3329 continue; 3330 3331 while (!skb_queue_empty(&local->pending[i])) { 3332 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3334 3335 if (WARN_ON(!info->control.vif)) { 3336 ieee80211_free_txskb(&local->hw, skb); 3337 continue; 3338 } 3339 3340 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3341 flags); 3342 3343 txok = ieee80211_tx_pending_skb(local, skb); 3344 spin_lock_irqsave(&local->queue_stop_reason_lock, 3345 flags); 3346 if (!txok) 3347 break; 3348 } 3349 3350 if (skb_queue_empty(&local->pending[i])) 3351 ieee80211_propagate_queue_wake(local, i); 3352 } 3353 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3354 3355 rcu_read_unlock(); 3356 } 3357 3358 /* functions for drivers to get certain frames */ 3359 3360 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3361 struct ps_data *ps, struct sk_buff *skb, 3362 bool is_template) 3363 { 3364 u8 *pos, *tim; 3365 int aid0 = 0; 3366 int i, have_bits = 0, n1, n2; 3367 3368 /* Generate bitmap for TIM only if there are any STAs in power save 3369 * mode. */ 3370 if (atomic_read(&ps->num_sta_ps) > 0) 3371 /* in the hope that this is faster than 3372 * checking byte-for-byte */ 3373 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3374 IEEE80211_MAX_AID+1); 3375 if (!is_template) { 3376 if (ps->dtim_count == 0) 3377 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3378 else 3379 ps->dtim_count--; 3380 } 3381 3382 tim = pos = (u8 *) skb_put(skb, 6); 3383 *pos++ = WLAN_EID_TIM; 3384 *pos++ = 4; 3385 *pos++ = ps->dtim_count; 3386 *pos++ = sdata->vif.bss_conf.dtim_period; 3387 3388 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3389 aid0 = 1; 3390 3391 ps->dtim_bc_mc = aid0 == 1; 3392 3393 if (have_bits) { 3394 /* Find largest even number N1 so that bits numbered 1 through 3395 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3396 * (N2 + 1) x 8 through 2007 are 0. */ 3397 n1 = 0; 3398 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3399 if (ps->tim[i]) { 3400 n1 = i & 0xfe; 3401 break; 3402 } 3403 } 3404 n2 = n1; 3405 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3406 if (ps->tim[i]) { 3407 n2 = i; 3408 break; 3409 } 3410 } 3411 3412 /* Bitmap control */ 3413 *pos++ = n1 | aid0; 3414 /* Part Virt Bitmap */ 3415 skb_put(skb, n2 - n1); 3416 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3417 3418 tim[1] = n2 - n1 + 4; 3419 } else { 3420 *pos++ = aid0; /* Bitmap control */ 3421 *pos++ = 0; /* Part Virt Bitmap */ 3422 } 3423 } 3424 3425 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3426 struct ps_data *ps, struct sk_buff *skb, 3427 bool is_template) 3428 { 3429 struct ieee80211_local *local = sdata->local; 3430 3431 /* 3432 * Not very nice, but we want to allow the driver to call 3433 * ieee80211_beacon_get() as a response to the set_tim() 3434 * callback. That, however, is already invoked under the 3435 * sta_lock to guarantee consistent and race-free update 3436 * of the tim bitmap in mac80211 and the driver. 3437 */ 3438 if (local->tim_in_locked_section) { 3439 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3440 } else { 3441 spin_lock_bh(&local->tim_lock); 3442 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3443 spin_unlock_bh(&local->tim_lock); 3444 } 3445 3446 return 0; 3447 } 3448 3449 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3450 struct beacon_data *beacon) 3451 { 3452 struct probe_resp *resp; 3453 u8 *beacon_data; 3454 size_t beacon_data_len; 3455 int i; 3456 u8 count = beacon->csa_current_counter; 3457 3458 switch (sdata->vif.type) { 3459 case NL80211_IFTYPE_AP: 3460 beacon_data = beacon->tail; 3461 beacon_data_len = beacon->tail_len; 3462 break; 3463 case NL80211_IFTYPE_ADHOC: 3464 beacon_data = beacon->head; 3465 beacon_data_len = beacon->head_len; 3466 break; 3467 case NL80211_IFTYPE_MESH_POINT: 3468 beacon_data = beacon->head; 3469 beacon_data_len = beacon->head_len; 3470 break; 3471 default: 3472 return; 3473 } 3474 3475 rcu_read_lock(); 3476 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3477 resp = rcu_dereference(sdata->u.ap.probe_resp); 3478 3479 if (beacon->csa_counter_offsets[i]) { 3480 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3481 beacon_data_len)) { 3482 rcu_read_unlock(); 3483 return; 3484 } 3485 3486 beacon_data[beacon->csa_counter_offsets[i]] = count; 3487 } 3488 3489 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3490 resp->data[resp->csa_counter_offsets[i]] = count; 3491 } 3492 rcu_read_unlock(); 3493 } 3494 3495 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3496 { 3497 beacon->csa_current_counter--; 3498 3499 /* the counter should never reach 0 */ 3500 WARN_ON_ONCE(!beacon->csa_current_counter); 3501 3502 return beacon->csa_current_counter; 3503 } 3504 3505 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3506 { 3507 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3508 struct beacon_data *beacon = NULL; 3509 u8 count = 0; 3510 3511 rcu_read_lock(); 3512 3513 if (sdata->vif.type == NL80211_IFTYPE_AP) 3514 beacon = rcu_dereference(sdata->u.ap.beacon); 3515 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3516 beacon = rcu_dereference(sdata->u.ibss.presp); 3517 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3518 beacon = rcu_dereference(sdata->u.mesh.beacon); 3519 3520 if (!beacon) 3521 goto unlock; 3522 3523 count = __ieee80211_csa_update_counter(beacon); 3524 3525 unlock: 3526 rcu_read_unlock(); 3527 return count; 3528 } 3529 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3530 3531 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3532 { 3533 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3534 struct beacon_data *beacon = NULL; 3535 u8 *beacon_data; 3536 size_t beacon_data_len; 3537 int ret = false; 3538 3539 if (!ieee80211_sdata_running(sdata)) 3540 return false; 3541 3542 rcu_read_lock(); 3543 if (vif->type == NL80211_IFTYPE_AP) { 3544 struct ieee80211_if_ap *ap = &sdata->u.ap; 3545 3546 beacon = rcu_dereference(ap->beacon); 3547 if (WARN_ON(!beacon || !beacon->tail)) 3548 goto out; 3549 beacon_data = beacon->tail; 3550 beacon_data_len = beacon->tail_len; 3551 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3552 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3553 3554 beacon = rcu_dereference(ifibss->presp); 3555 if (!beacon) 3556 goto out; 3557 3558 beacon_data = beacon->head; 3559 beacon_data_len = beacon->head_len; 3560 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3561 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3562 3563 beacon = rcu_dereference(ifmsh->beacon); 3564 if (!beacon) 3565 goto out; 3566 3567 beacon_data = beacon->head; 3568 beacon_data_len = beacon->head_len; 3569 } else { 3570 WARN_ON(1); 3571 goto out; 3572 } 3573 3574 if (!beacon->csa_counter_offsets[0]) 3575 goto out; 3576 3577 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3578 goto out; 3579 3580 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3581 ret = true; 3582 out: 3583 rcu_read_unlock(); 3584 3585 return ret; 3586 } 3587 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3588 3589 static struct sk_buff * 3590 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3591 struct ieee80211_vif *vif, 3592 struct ieee80211_mutable_offsets *offs, 3593 bool is_template) 3594 { 3595 struct ieee80211_local *local = hw_to_local(hw); 3596 struct beacon_data *beacon = NULL; 3597 struct sk_buff *skb = NULL; 3598 struct ieee80211_tx_info *info; 3599 struct ieee80211_sub_if_data *sdata = NULL; 3600 enum nl80211_band band; 3601 struct ieee80211_tx_rate_control txrc; 3602 struct ieee80211_chanctx_conf *chanctx_conf; 3603 int csa_off_base = 0; 3604 3605 rcu_read_lock(); 3606 3607 sdata = vif_to_sdata(vif); 3608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3609 3610 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3611 goto out; 3612 3613 if (offs) 3614 memset(offs, 0, sizeof(*offs)); 3615 3616 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3617 struct ieee80211_if_ap *ap = &sdata->u.ap; 3618 3619 beacon = rcu_dereference(ap->beacon); 3620 if (beacon) { 3621 if (beacon->csa_counter_offsets[0]) { 3622 if (!is_template) 3623 __ieee80211_csa_update_counter(beacon); 3624 3625 ieee80211_set_csa(sdata, beacon); 3626 } 3627 3628 /* 3629 * headroom, head length, 3630 * tail length and maximum TIM length 3631 */ 3632 skb = dev_alloc_skb(local->tx_headroom + 3633 beacon->head_len + 3634 beacon->tail_len + 256 + 3635 local->hw.extra_beacon_tailroom); 3636 if (!skb) 3637 goto out; 3638 3639 skb_reserve(skb, local->tx_headroom); 3640 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3641 beacon->head_len); 3642 3643 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3644 is_template); 3645 3646 if (offs) { 3647 offs->tim_offset = beacon->head_len; 3648 offs->tim_length = skb->len - beacon->head_len; 3649 3650 /* for AP the csa offsets are from tail */ 3651 csa_off_base = skb->len; 3652 } 3653 3654 if (beacon->tail) 3655 memcpy(skb_put(skb, beacon->tail_len), 3656 beacon->tail, beacon->tail_len); 3657 } else 3658 goto out; 3659 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3660 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3661 struct ieee80211_hdr *hdr; 3662 3663 beacon = rcu_dereference(ifibss->presp); 3664 if (!beacon) 3665 goto out; 3666 3667 if (beacon->csa_counter_offsets[0]) { 3668 if (!is_template) 3669 __ieee80211_csa_update_counter(beacon); 3670 3671 ieee80211_set_csa(sdata, beacon); 3672 } 3673 3674 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3675 local->hw.extra_beacon_tailroom); 3676 if (!skb) 3677 goto out; 3678 skb_reserve(skb, local->tx_headroom); 3679 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3680 beacon->head_len); 3681 3682 hdr = (struct ieee80211_hdr *) skb->data; 3683 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3684 IEEE80211_STYPE_BEACON); 3685 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3686 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3687 3688 beacon = rcu_dereference(ifmsh->beacon); 3689 if (!beacon) 3690 goto out; 3691 3692 if (beacon->csa_counter_offsets[0]) { 3693 if (!is_template) 3694 /* TODO: For mesh csa_counter is in TU, so 3695 * decrementing it by one isn't correct, but 3696 * for now we leave it consistent with overall 3697 * mac80211's behavior. 3698 */ 3699 __ieee80211_csa_update_counter(beacon); 3700 3701 ieee80211_set_csa(sdata, beacon); 3702 } 3703 3704 if (ifmsh->sync_ops) 3705 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3706 3707 skb = dev_alloc_skb(local->tx_headroom + 3708 beacon->head_len + 3709 256 + /* TIM IE */ 3710 beacon->tail_len + 3711 local->hw.extra_beacon_tailroom); 3712 if (!skb) 3713 goto out; 3714 skb_reserve(skb, local->tx_headroom); 3715 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3716 beacon->head_len); 3717 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3718 3719 if (offs) { 3720 offs->tim_offset = beacon->head_len; 3721 offs->tim_length = skb->len - beacon->head_len; 3722 } 3723 3724 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3725 beacon->tail_len); 3726 } else { 3727 WARN_ON(1); 3728 goto out; 3729 } 3730 3731 /* CSA offsets */ 3732 if (offs && beacon) { 3733 int i; 3734 3735 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3736 u16 csa_off = beacon->csa_counter_offsets[i]; 3737 3738 if (!csa_off) 3739 continue; 3740 3741 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3742 } 3743 } 3744 3745 band = chanctx_conf->def.chan->band; 3746 3747 info = IEEE80211_SKB_CB(skb); 3748 3749 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3750 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3751 info->band = band; 3752 3753 memset(&txrc, 0, sizeof(txrc)); 3754 txrc.hw = hw; 3755 txrc.sband = local->hw.wiphy->bands[band]; 3756 txrc.bss_conf = &sdata->vif.bss_conf; 3757 txrc.skb = skb; 3758 txrc.reported_rate.idx = -1; 3759 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3760 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3761 txrc.max_rate_idx = -1; 3762 else 3763 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3764 txrc.bss = true; 3765 rate_control_get_rate(sdata, NULL, &txrc); 3766 3767 info->control.vif = vif; 3768 3769 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3770 IEEE80211_TX_CTL_ASSIGN_SEQ | 3771 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3772 out: 3773 rcu_read_unlock(); 3774 return skb; 3775 3776 } 3777 3778 struct sk_buff * 3779 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3780 struct ieee80211_vif *vif, 3781 struct ieee80211_mutable_offsets *offs) 3782 { 3783 return __ieee80211_beacon_get(hw, vif, offs, true); 3784 } 3785 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3786 3787 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3788 struct ieee80211_vif *vif, 3789 u16 *tim_offset, u16 *tim_length) 3790 { 3791 struct ieee80211_mutable_offsets offs = {}; 3792 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3793 struct sk_buff *copy; 3794 struct ieee80211_supported_band *sband; 3795 int shift; 3796 3797 if (!bcn) 3798 return bcn; 3799 3800 if (tim_offset) 3801 *tim_offset = offs.tim_offset; 3802 3803 if (tim_length) 3804 *tim_length = offs.tim_length; 3805 3806 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 3807 !hw_to_local(hw)->monitors) 3808 return bcn; 3809 3810 /* send a copy to monitor interfaces */ 3811 copy = skb_copy(bcn, GFP_ATOMIC); 3812 if (!copy) 3813 return bcn; 3814 3815 shift = ieee80211_vif_get_shift(vif); 3816 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 3817 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 3818 3819 return bcn; 3820 } 3821 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3822 3823 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3824 struct ieee80211_vif *vif) 3825 { 3826 struct ieee80211_if_ap *ap = NULL; 3827 struct sk_buff *skb = NULL; 3828 struct probe_resp *presp = NULL; 3829 struct ieee80211_hdr *hdr; 3830 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3831 3832 if (sdata->vif.type != NL80211_IFTYPE_AP) 3833 return NULL; 3834 3835 rcu_read_lock(); 3836 3837 ap = &sdata->u.ap; 3838 presp = rcu_dereference(ap->probe_resp); 3839 if (!presp) 3840 goto out; 3841 3842 skb = dev_alloc_skb(presp->len); 3843 if (!skb) 3844 goto out; 3845 3846 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3847 3848 hdr = (struct ieee80211_hdr *) skb->data; 3849 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3850 3851 out: 3852 rcu_read_unlock(); 3853 return skb; 3854 } 3855 EXPORT_SYMBOL(ieee80211_proberesp_get); 3856 3857 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3858 struct ieee80211_vif *vif) 3859 { 3860 struct ieee80211_sub_if_data *sdata; 3861 struct ieee80211_if_managed *ifmgd; 3862 struct ieee80211_pspoll *pspoll; 3863 struct ieee80211_local *local; 3864 struct sk_buff *skb; 3865 3866 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3867 return NULL; 3868 3869 sdata = vif_to_sdata(vif); 3870 ifmgd = &sdata->u.mgd; 3871 local = sdata->local; 3872 3873 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3874 if (!skb) 3875 return NULL; 3876 3877 skb_reserve(skb, local->hw.extra_tx_headroom); 3878 3879 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3880 memset(pspoll, 0, sizeof(*pspoll)); 3881 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3882 IEEE80211_STYPE_PSPOLL); 3883 pspoll->aid = cpu_to_le16(ifmgd->aid); 3884 3885 /* aid in PS-Poll has its two MSBs each set to 1 */ 3886 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3887 3888 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3889 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3890 3891 return skb; 3892 } 3893 EXPORT_SYMBOL(ieee80211_pspoll_get); 3894 3895 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3896 struct ieee80211_vif *vif) 3897 { 3898 struct ieee80211_hdr_3addr *nullfunc; 3899 struct ieee80211_sub_if_data *sdata; 3900 struct ieee80211_if_managed *ifmgd; 3901 struct ieee80211_local *local; 3902 struct sk_buff *skb; 3903 3904 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3905 return NULL; 3906 3907 sdata = vif_to_sdata(vif); 3908 ifmgd = &sdata->u.mgd; 3909 local = sdata->local; 3910 3911 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3912 if (!skb) 3913 return NULL; 3914 3915 skb_reserve(skb, local->hw.extra_tx_headroom); 3916 3917 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3918 sizeof(*nullfunc)); 3919 memset(nullfunc, 0, sizeof(*nullfunc)); 3920 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3921 IEEE80211_STYPE_NULLFUNC | 3922 IEEE80211_FCTL_TODS); 3923 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3924 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3925 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3926 3927 return skb; 3928 } 3929 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3930 3931 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3932 const u8 *src_addr, 3933 const u8 *ssid, size_t ssid_len, 3934 size_t tailroom) 3935 { 3936 struct ieee80211_local *local = hw_to_local(hw); 3937 struct ieee80211_hdr_3addr *hdr; 3938 struct sk_buff *skb; 3939 size_t ie_ssid_len; 3940 u8 *pos; 3941 3942 ie_ssid_len = 2 + ssid_len; 3943 3944 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3945 ie_ssid_len + tailroom); 3946 if (!skb) 3947 return NULL; 3948 3949 skb_reserve(skb, local->hw.extra_tx_headroom); 3950 3951 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3952 memset(hdr, 0, sizeof(*hdr)); 3953 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3954 IEEE80211_STYPE_PROBE_REQ); 3955 eth_broadcast_addr(hdr->addr1); 3956 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3957 eth_broadcast_addr(hdr->addr3); 3958 3959 pos = skb_put(skb, ie_ssid_len); 3960 *pos++ = WLAN_EID_SSID; 3961 *pos++ = ssid_len; 3962 if (ssid_len) 3963 memcpy(pos, ssid, ssid_len); 3964 pos += ssid_len; 3965 3966 return skb; 3967 } 3968 EXPORT_SYMBOL(ieee80211_probereq_get); 3969 3970 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3971 const void *frame, size_t frame_len, 3972 const struct ieee80211_tx_info *frame_txctl, 3973 struct ieee80211_rts *rts) 3974 { 3975 const struct ieee80211_hdr *hdr = frame; 3976 3977 rts->frame_control = 3978 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3979 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3980 frame_txctl); 3981 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3982 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3983 } 3984 EXPORT_SYMBOL(ieee80211_rts_get); 3985 3986 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3987 const void *frame, size_t frame_len, 3988 const struct ieee80211_tx_info *frame_txctl, 3989 struct ieee80211_cts *cts) 3990 { 3991 const struct ieee80211_hdr *hdr = frame; 3992 3993 cts->frame_control = 3994 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3995 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3996 frame_len, frame_txctl); 3997 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3998 } 3999 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4000 4001 struct sk_buff * 4002 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4003 struct ieee80211_vif *vif) 4004 { 4005 struct ieee80211_local *local = hw_to_local(hw); 4006 struct sk_buff *skb = NULL; 4007 struct ieee80211_tx_data tx; 4008 struct ieee80211_sub_if_data *sdata; 4009 struct ps_data *ps; 4010 struct ieee80211_tx_info *info; 4011 struct ieee80211_chanctx_conf *chanctx_conf; 4012 4013 sdata = vif_to_sdata(vif); 4014 4015 rcu_read_lock(); 4016 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4017 4018 if (!chanctx_conf) 4019 goto out; 4020 4021 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4022 struct beacon_data *beacon = 4023 rcu_dereference(sdata->u.ap.beacon); 4024 4025 if (!beacon || !beacon->head) 4026 goto out; 4027 4028 ps = &sdata->u.ap.ps; 4029 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4030 ps = &sdata->u.mesh.ps; 4031 } else { 4032 goto out; 4033 } 4034 4035 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4036 goto out; /* send buffered bc/mc only after DTIM beacon */ 4037 4038 while (1) { 4039 skb = skb_dequeue(&ps->bc_buf); 4040 if (!skb) 4041 goto out; 4042 local->total_ps_buffered--; 4043 4044 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4045 struct ieee80211_hdr *hdr = 4046 (struct ieee80211_hdr *) skb->data; 4047 /* more buffered multicast/broadcast frames ==> set 4048 * MoreData flag in IEEE 802.11 header to inform PS 4049 * STAs */ 4050 hdr->frame_control |= 4051 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4052 } 4053 4054 if (sdata->vif.type == NL80211_IFTYPE_AP) 4055 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4056 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4057 break; 4058 dev_kfree_skb_any(skb); 4059 } 4060 4061 info = IEEE80211_SKB_CB(skb); 4062 4063 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4064 info->band = chanctx_conf->def.chan->band; 4065 4066 if (invoke_tx_handlers(&tx)) 4067 skb = NULL; 4068 out: 4069 rcu_read_unlock(); 4070 4071 return skb; 4072 } 4073 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4074 4075 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4076 { 4077 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4078 struct ieee80211_sub_if_data *sdata = sta->sdata; 4079 struct ieee80211_local *local = sdata->local; 4080 int ret; 4081 u32 queues; 4082 4083 lockdep_assert_held(&local->sta_mtx); 4084 4085 /* only some cases are supported right now */ 4086 switch (sdata->vif.type) { 4087 case NL80211_IFTYPE_STATION: 4088 case NL80211_IFTYPE_AP: 4089 case NL80211_IFTYPE_AP_VLAN: 4090 break; 4091 default: 4092 WARN_ON(1); 4093 return -EINVAL; 4094 } 4095 4096 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4097 return -EINVAL; 4098 4099 if (sta->reserved_tid == tid) { 4100 ret = 0; 4101 goto out; 4102 } 4103 4104 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4105 sdata_err(sdata, "TID reservation already active\n"); 4106 ret = -EALREADY; 4107 goto out; 4108 } 4109 4110 ieee80211_stop_vif_queues(sdata->local, sdata, 4111 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4112 4113 synchronize_net(); 4114 4115 /* Tear down BA sessions so we stop aggregating on this TID */ 4116 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4117 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4118 __ieee80211_stop_tx_ba_session(sta, tid, 4119 AGG_STOP_LOCAL_REQUEST); 4120 } 4121 4122 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4123 __ieee80211_flush_queues(local, sdata, queues, false); 4124 4125 sta->reserved_tid = tid; 4126 4127 ieee80211_wake_vif_queues(local, sdata, 4128 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4129 4130 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4131 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4132 4133 ret = 0; 4134 out: 4135 return ret; 4136 } 4137 EXPORT_SYMBOL(ieee80211_reserve_tid); 4138 4139 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4140 { 4141 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4142 struct ieee80211_sub_if_data *sdata = sta->sdata; 4143 4144 lockdep_assert_held(&sdata->local->sta_mtx); 4145 4146 /* only some cases are supported right now */ 4147 switch (sdata->vif.type) { 4148 case NL80211_IFTYPE_STATION: 4149 case NL80211_IFTYPE_AP: 4150 case NL80211_IFTYPE_AP_VLAN: 4151 break; 4152 default: 4153 WARN_ON(1); 4154 return; 4155 } 4156 4157 if (tid != sta->reserved_tid) { 4158 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4159 return; 4160 } 4161 4162 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4163 } 4164 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4165 4166 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4167 struct sk_buff *skb, int tid, 4168 enum nl80211_band band) 4169 { 4170 int ac = ieee802_1d_to_ac[tid & 7]; 4171 4172 skb_reset_mac_header(skb); 4173 skb_reset_network_header(skb); 4174 skb_reset_transport_header(skb); 4175 4176 skb_set_queue_mapping(skb, ac); 4177 skb->priority = tid; 4178 4179 skb->dev = sdata->dev; 4180 4181 /* 4182 * The other path calling ieee80211_xmit is from the tasklet, 4183 * and while we can handle concurrent transmissions locking 4184 * requirements are that we do not come into tx with bhs on. 4185 */ 4186 local_bh_disable(); 4187 IEEE80211_SKB_CB(skb)->band = band; 4188 ieee80211_xmit(sdata, NULL, skb); 4189 local_bh_enable(); 4190 } 4191