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/if_vlan.h> 20 #include <linux/etherdevice.h> 21 #include <linux/bitmap.h> 22 #include <linux/rcupdate.h> 23 #include <linux/export.h> 24 #include <net/net_namespace.h> 25 #include <net/ieee80211_radiotap.h> 26 #include <net/cfg80211.h> 27 #include <net/mac80211.h> 28 #include <net/codel.h> 29 #include <net/codel_impl.h> 30 #include <asm/unaligned.h> 31 #include <net/fq_impl.h> 32 33 #include "ieee80211_i.h" 34 #include "driver-ops.h" 35 #include "led.h" 36 #include "mesh.h" 37 #include "wep.h" 38 #include "wpa.h" 39 #include "wme.h" 40 #include "rate.h" 41 42 /* misc utils */ 43 44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 45 { 46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 47 48 u64_stats_update_begin(&tstats->syncp); 49 tstats->tx_packets++; 50 tstats->tx_bytes += len; 51 u64_stats_update_end(&tstats->syncp); 52 } 53 54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 55 struct sk_buff *skb, int group_addr, 56 int next_frag_len) 57 { 58 int rate, mrate, erp, dur, i, shift = 0; 59 struct ieee80211_rate *txrate; 60 struct ieee80211_local *local = tx->local; 61 struct ieee80211_supported_band *sband; 62 struct ieee80211_hdr *hdr; 63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 64 struct ieee80211_chanctx_conf *chanctx_conf; 65 u32 rate_flags = 0; 66 67 /* assume HW handles this */ 68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 69 return 0; 70 71 rcu_read_lock(); 72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 73 if (chanctx_conf) { 74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 76 } 77 rcu_read_unlock(); 78 79 /* uh huh? */ 80 if (WARN_ON_ONCE(tx->rate.idx < 0)) 81 return 0; 82 83 sband = local->hw.wiphy->bands[info->band]; 84 txrate = &sband->bitrates[tx->rate.idx]; 85 86 erp = txrate->flags & IEEE80211_RATE_ERP_G; 87 88 /* 89 * data and mgmt (except PS Poll): 90 * - during CFP: 32768 91 * - during contention period: 92 * if addr1 is group address: 0 93 * if more fragments = 0 and addr1 is individual address: time to 94 * transmit one ACK plus SIFS 95 * if more fragments = 1 and addr1 is individual address: time to 96 * transmit next fragment plus 2 x ACK plus 3 x SIFS 97 * 98 * IEEE 802.11, 9.6: 99 * - control response frame (CTS or ACK) shall be transmitted using the 100 * same rate as the immediately previous frame in the frame exchange 101 * sequence, if this rate belongs to the PHY mandatory rates, or else 102 * at the highest possible rate belonging to the PHY rates in the 103 * BSSBasicRateSet 104 */ 105 hdr = (struct ieee80211_hdr *)skb->data; 106 if (ieee80211_is_ctl(hdr->frame_control)) { 107 /* TODO: These control frames are not currently sent by 108 * mac80211, but should they be implemented, this function 109 * needs to be updated to support duration field calculation. 110 * 111 * RTS: time needed to transmit pending data/mgmt frame plus 112 * one CTS frame plus one ACK frame plus 3 x SIFS 113 * CTS: duration of immediately previous RTS minus time 114 * required to transmit CTS and its SIFS 115 * ACK: 0 if immediately previous directed data/mgmt had 116 * more=0, with more=1 duration in ACK frame is duration 117 * from previous frame minus time needed to transmit ACK 118 * and its SIFS 119 * PS Poll: BIT(15) | BIT(14) | aid 120 */ 121 return 0; 122 } 123 124 /* data/mgmt */ 125 if (0 /* FIX: data/mgmt during CFP */) 126 return cpu_to_le16(32768); 127 128 if (group_addr) /* Group address as the destination - no ACK */ 129 return 0; 130 131 /* Individual destination address: 132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 133 * CTS and ACK frames shall be transmitted using the highest rate in 134 * basic rate set that is less than or equal to the rate of the 135 * immediately previous frame and that is using the same modulation 136 * (CCK or OFDM). If no basic rate set matches with these requirements, 137 * the highest mandatory rate of the PHY that is less than or equal to 138 * the rate of the previous frame is used. 139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 140 */ 141 rate = -1; 142 /* use lowest available if everything fails */ 143 mrate = sband->bitrates[0].bitrate; 144 for (i = 0; i < sband->n_bitrates; i++) { 145 struct ieee80211_rate *r = &sband->bitrates[i]; 146 147 if (r->bitrate > txrate->bitrate) 148 break; 149 150 if ((rate_flags & r->flags) != rate_flags) 151 continue; 152 153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 155 156 switch (sband->band) { 157 case NL80211_BAND_2GHZ: { 158 u32 flag; 159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 160 flag = IEEE80211_RATE_MANDATORY_G; 161 else 162 flag = IEEE80211_RATE_MANDATORY_B; 163 if (r->flags & flag) 164 mrate = r->bitrate; 165 break; 166 } 167 case NL80211_BAND_5GHZ: 168 if (r->flags & IEEE80211_RATE_MANDATORY_A) 169 mrate = r->bitrate; 170 break; 171 case NL80211_BAND_60GHZ: 172 /* TODO, for now fall through */ 173 case NUM_NL80211_BANDS: 174 WARN_ON(1); 175 break; 176 } 177 } 178 if (rate == -1) { 179 /* No matching basic rate found; use highest suitable mandatory 180 * PHY rate */ 181 rate = DIV_ROUND_UP(mrate, 1 << shift); 182 } 183 184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 185 if (ieee80211_is_data_qos(hdr->frame_control) && 186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 187 dur = 0; 188 else 189 /* Time needed to transmit ACK 190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 191 * to closest integer */ 192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 193 tx->sdata->vif.bss_conf.use_short_preamble, 194 shift); 195 196 if (next_frag_len) { 197 /* Frame is fragmented: duration increases with time needed to 198 * transmit next fragment plus ACK and 2 x SIFS. */ 199 dur *= 2; /* ACK + SIFS */ 200 /* next fragment */ 201 dur += ieee80211_frame_duration(sband->band, next_frag_len, 202 txrate->bitrate, erp, 203 tx->sdata->vif.bss_conf.use_short_preamble, 204 shift); 205 } 206 207 return cpu_to_le16(dur); 208 } 209 210 /* tx handlers */ 211 static ieee80211_tx_result debug_noinline 212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 213 { 214 struct ieee80211_local *local = tx->local; 215 struct ieee80211_if_managed *ifmgd; 216 217 /* driver doesn't support power save */ 218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 219 return TX_CONTINUE; 220 221 /* hardware does dynamic power save */ 222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 223 return TX_CONTINUE; 224 225 /* dynamic power save disabled */ 226 if (local->hw.conf.dynamic_ps_timeout <= 0) 227 return TX_CONTINUE; 228 229 /* we are scanning, don't enable power save */ 230 if (local->scanning) 231 return TX_CONTINUE; 232 233 if (!local->ps_sdata) 234 return TX_CONTINUE; 235 236 /* No point if we're going to suspend */ 237 if (local->quiescing) 238 return TX_CONTINUE; 239 240 /* dynamic ps is supported only in managed mode */ 241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 242 return TX_CONTINUE; 243 244 ifmgd = &tx->sdata->u.mgd; 245 246 /* 247 * Don't wakeup from power save if u-apsd is enabled, voip ac has 248 * u-apsd enabled and the frame is in voip class. This effectively 249 * means that even if all access categories have u-apsd enabled, in 250 * practise u-apsd is only used with the voip ac. This is a 251 * workaround for the case when received voip class packets do not 252 * have correct qos tag for some reason, due the network or the 253 * peer application. 254 * 255 * Note: ifmgd->uapsd_queues access is racy here. If the value is 256 * changed via debugfs, user needs to reassociate manually to have 257 * everything in sync. 258 */ 259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 262 return TX_CONTINUE; 263 264 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 265 ieee80211_stop_queues_by_reason(&local->hw, 266 IEEE80211_MAX_QUEUE_MAP, 267 IEEE80211_QUEUE_STOP_REASON_PS, 268 false); 269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 270 ieee80211_queue_work(&local->hw, 271 &local->dynamic_ps_disable_work); 272 } 273 274 /* Don't restart the timer if we're not disassociated */ 275 if (!ifmgd->associated) 276 return TX_CONTINUE; 277 278 mod_timer(&local->dynamic_ps_timer, jiffies + 279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 280 281 return TX_CONTINUE; 282 } 283 284 static ieee80211_tx_result debug_noinline 285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 286 { 287 288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 290 bool assoc = false; 291 292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 293 return TX_CONTINUE; 294 295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 297 !ieee80211_is_probe_req(hdr->frame_control) && 298 !ieee80211_is_nullfunc(hdr->frame_control)) 299 /* 300 * When software scanning only nullfunc frames (to notify 301 * the sleep state to the AP) and probe requests (for the 302 * active scan) are allowed, all other frames should not be 303 * sent and we should not get here, but if we do 304 * nonetheless, drop them to avoid sending them 305 * off-channel. See the link below and 306 * ieee80211_start_scan() for more. 307 * 308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 309 */ 310 return TX_DROP; 311 312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 313 return TX_CONTINUE; 314 315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 316 return TX_CONTINUE; 317 318 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 319 return TX_CONTINUE; 320 321 if (tx->sta) 322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 323 324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 325 if (unlikely(!assoc && 326 ieee80211_is_data(hdr->frame_control))) { 327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 328 sdata_info(tx->sdata, 329 "dropped data frame to not associated station %pM\n", 330 hdr->addr1); 331 #endif 332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 333 return TX_DROP; 334 } 335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 ieee80211_free_txskb(&local->hw, skb); 372 } 373 total += skb_queue_len(&ps->bc_buf); 374 } 375 376 /* 377 * Drop one frame from each station from the lowest-priority 378 * AC that has frames at all. 379 */ 380 list_for_each_entry_rcu(sta, &local->sta_list, list) { 381 int ac; 382 383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 384 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 385 total += skb_queue_len(&sta->ps_tx_buf[ac]); 386 if (skb) { 387 purged++; 388 ieee80211_free_txskb(&local->hw, skb); 389 break; 390 } 391 } 392 } 393 394 local->total_ps_buffered = total; 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 396 } 397 398 static ieee80211_tx_result 399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 400 { 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 403 struct ps_data *ps; 404 405 /* 406 * broadcast/multicast frame 407 * 408 * If any of the associated/peer stations is in power save mode, 409 * the frame is buffered to be sent after DTIM beacon frame. 410 * This is done either by the hardware or us. 411 */ 412 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 416 if (!tx->sdata->bss) 417 return TX_CONTINUE; 418 419 ps = &tx->sdata->bss->ps; 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 421 ps = &tx->sdata->u.mesh.ps; 422 } else { 423 return TX_CONTINUE; 424 } 425 426 427 /* no buffering for ordered frames */ 428 if (ieee80211_has_order(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_is_probe_req(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 435 info->hw_queue = tx->sdata->vif.cab_queue; 436 437 /* no stations in PS mode */ 438 if (!atomic_read(&ps->num_sta_ps)) 439 return TX_CONTINUE; 440 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 442 443 /* device releases frame after DTIM beacon */ 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 445 return TX_CONTINUE; 446 447 /* buffered in mac80211 */ 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 449 purge_old_ps_buffers(tx->local); 450 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 452 ps_dbg(tx->sdata, 453 "BC TX buffer full - dropping the oldest frame\n"); 454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 455 } else 456 tx->local->total_ps_buffered++; 457 458 skb_queue_tail(&ps->bc_buf, tx->skb); 459 460 return TX_QUEUED; 461 } 462 463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 464 struct sk_buff *skb) 465 { 466 if (!ieee80211_is_mgmt(fc)) 467 return 0; 468 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 470 return 0; 471 472 if (!ieee80211_is_robust_mgmt_frame(skb)) 473 return 0; 474 475 return 1; 476 } 477 478 static ieee80211_tx_result 479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 480 { 481 struct sta_info *sta = tx->sta; 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 484 struct ieee80211_local *local = tx->local; 485 486 if (unlikely(!sta)) 487 return TX_CONTINUE; 488 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 493 int ac = skb_get_queue_mapping(tx->skb); 494 495 if (ieee80211_is_mgmt(hdr->frame_control) && 496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 498 return TX_CONTINUE; 499 } 500 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 502 sta->sta.addr, sta->sta.aid, ac); 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 504 purge_old_ps_buffers(tx->local); 505 506 /* sync with ieee80211_sta_ps_deliver_wakeup */ 507 spin_lock(&sta->ps_lock); 508 /* 509 * STA woke up the meantime and all the frames on ps_tx_buf have 510 * been queued to pending queue. No reordering can happen, go 511 * ahead and Tx the packet. 512 */ 513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 516 spin_unlock(&sta->ps_lock); 517 return TX_CONTINUE; 518 } 519 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 522 ps_dbg(tx->sdata, 523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 524 sta->sta.addr, ac); 525 ieee80211_free_txskb(&local->hw, old); 526 } else 527 tx->local->total_ps_buffered++; 528 529 info->control.jiffies = jiffies; 530 info->control.vif = &tx->sdata->vif; 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 534 spin_unlock(&sta->ps_lock); 535 536 if (!timer_pending(&local->sta_cleanup)) 537 mod_timer(&local->sta_cleanup, 538 round_jiffies(jiffies + 539 STA_INFO_CLEANUP_INTERVAL)); 540 541 /* 542 * We queued up some frames, so the TIM bit might 543 * need to be set, recalculate it. 544 */ 545 sta_info_recalc_tim(sta); 546 547 return TX_QUEUED; 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 549 ps_dbg(tx->sdata, 550 "STA %pM in PS mode, but polling/in SP -> send frame\n", 551 sta->sta.addr); 552 } 553 554 return TX_CONTINUE; 555 } 556 557 static ieee80211_tx_result debug_noinline 558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 559 { 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 561 return TX_CONTINUE; 562 563 if (tx->flags & IEEE80211_TX_UNICAST) 564 return ieee80211_tx_h_unicast_ps_buf(tx); 565 else 566 return ieee80211_tx_h_multicast_ps_buf(tx); 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 575 if (tx->sdata->control_port_no_encrypt) 576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 579 } 580 581 return TX_CONTINUE; 582 } 583 584 static ieee80211_tx_result debug_noinline 585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 586 { 587 struct ieee80211_key *key; 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 590 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 592 tx->key = NULL; 593 else if (tx->sta && 594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 595 tx->key = key; 596 else if (ieee80211_is_group_privacy_action(tx->skb) && 597 (key = rcu_dereference(tx->sdata->default_multicast_key))) 598 tx->key = key; 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 603 tx->key = key; 604 else if (is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_multicast_key))) 606 tx->key = key; 607 else if (!is_multicast_ether_addr(hdr->addr1) && 608 (key = rcu_dereference(tx->sdata->default_unicast_key))) 609 tx->key = key; 610 else 611 tx->key = NULL; 612 613 if (tx->key) { 614 bool skip_hw = false; 615 616 /* TODO: add threshold stuff again */ 617 618 switch (tx->key->conf.cipher) { 619 case WLAN_CIPHER_SUITE_WEP40: 620 case WLAN_CIPHER_SUITE_WEP104: 621 case WLAN_CIPHER_SUITE_TKIP: 622 if (!ieee80211_is_data_present(hdr->frame_control)) 623 tx->key = NULL; 624 break; 625 case WLAN_CIPHER_SUITE_CCMP: 626 case WLAN_CIPHER_SUITE_CCMP_256: 627 case WLAN_CIPHER_SUITE_GCMP: 628 case WLAN_CIPHER_SUITE_GCMP_256: 629 if (!ieee80211_is_data_present(hdr->frame_control) && 630 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 631 tx->skb) && 632 !ieee80211_is_group_privacy_action(tx->skb)) 633 tx->key = NULL; 634 else 635 skip_hw = (tx->key->conf.flags & 636 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 637 ieee80211_is_mgmt(hdr->frame_control); 638 break; 639 case WLAN_CIPHER_SUITE_AES_CMAC: 640 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 643 if (!ieee80211_is_mgmt(hdr->frame_control)) 644 tx->key = NULL; 645 break; 646 } 647 648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 649 !ieee80211_is_deauth(hdr->frame_control))) 650 return TX_DROP; 651 652 if (!skip_hw && tx->key && 653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 654 info->control.hw_key = &tx->key->conf; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 686 if (tx->sdata->rc_has_mcs_mask[info->band]) 687 txrc.rate_idx_mcs_mask = 688 tx->sdata->rc_rateidx_mcs_mask[info->band]; 689 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 693 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 /* don't ask rate control when rate already injected via radiotap */ 717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 718 return TX_CONTINUE; 719 720 if (tx->sta) 721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 722 723 /* 724 * Lets not bother rate control if we're associated and cannot 725 * talk to the sta. This should not happen. 726 */ 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 728 !rate_usable_index_exists(sband, &tx->sta->sta), 729 "%s: Dropped data frame as no usable bitrate found while " 730 "scanning and associated. Target station: " 731 "%pM on %d GHz band\n", 732 tx->sdata->name, hdr->addr1, 733 info->band ? 5 : 2)) 734 return TX_DROP; 735 736 /* 737 * If we're associated with the sta at this point we know we can at 738 * least send the frame at the lowest bit rate. 739 */ 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 741 742 if (tx->sta && !info->control.skip_table) 743 ratetbl = rcu_dereference(tx->sta->sta.rates); 744 745 if (unlikely(info->control.rates[0].idx < 0)) { 746 if (ratetbl) { 747 struct ieee80211_tx_rate rate = { 748 .idx = ratetbl->rate[0].idx, 749 .flags = ratetbl->rate[0].flags, 750 .count = ratetbl->rate[0].count 751 }; 752 753 if (ratetbl->rate[0].idx < 0) 754 return TX_DROP; 755 756 tx->rate = rate; 757 } else { 758 return TX_DROP; 759 } 760 } else { 761 tx->rate = info->control.rates[0]; 762 } 763 764 if (txrc.reported_rate.idx < 0) { 765 txrc.reported_rate = tx->rate; 766 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 767 tx->sta->tx_stats.last_rate = txrc.reported_rate; 768 } else if (tx->sta) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 771 if (ratetbl) 772 return TX_CONTINUE; 773 774 if (unlikely(!info->control.rates[0].count)) 775 info->control.rates[0].count = 1; 776 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 778 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 779 info->control.rates[0].count = 1; 780 781 return TX_CONTINUE; 782 } 783 784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 785 { 786 u16 *seq = &sta->tid_seq[tid]; 787 __le16 ret = cpu_to_le16(*seq); 788 789 /* Increase the sequence number. */ 790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 791 792 return ret; 793 } 794 795 static ieee80211_tx_result debug_noinline 796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 797 { 798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 800 u8 *qc; 801 int tid; 802 803 /* 804 * Packet injection may want to control the sequence 805 * number, if we have no matching interface then we 806 * neither assign one ourselves nor ask the driver to. 807 */ 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 809 return TX_CONTINUE; 810 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 812 return TX_CONTINUE; 813 814 if (ieee80211_hdrlen(hdr->frame_control) < 24) 815 return TX_CONTINUE; 816 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 818 return TX_CONTINUE; 819 820 /* 821 * Anything but QoS data that has a sequence number field 822 * (is long enough) gets a sequence number from the global 823 * counter. QoS data frames with a multicast destination 824 * also use the global counter (802.11-2012 9.3.2.10). 825 */ 826 if (!ieee80211_is_data_qos(hdr->frame_control) || 827 is_multicast_ether_addr(hdr->addr1)) { 828 /* driver should assign sequence number */ 829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 830 /* for pure STA mode without beacons, we can do it */ 831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 832 tx->sdata->sequence_number += 0x10; 833 if (tx->sta) 834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 835 return TX_CONTINUE; 836 } 837 838 /* 839 * This should be true for injected/management frames only, for 840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 841 * above since they are not QoS-data frames. 842 */ 843 if (!tx->sta) 844 return TX_CONTINUE; 845 846 /* include per-STA, per-TID sequence counter */ 847 848 qc = ieee80211_get_qos_ctl(hdr); 849 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer && tid_tx->timeout) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 u8 *qc; 1162 1163 memset(tx, 0, sizeof(*tx)); 1164 tx->skb = skb; 1165 tx->local = local; 1166 tx->sdata = sdata; 1167 __skb_queue_head_init(&tx->skbs); 1168 1169 /* 1170 * If this flag is set to true anywhere, and we get here, 1171 * we are doing the needed processing, so remove the flag 1172 * now. 1173 */ 1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1175 1176 hdr = (struct ieee80211_hdr *) skb->data; 1177 1178 if (likely(sta)) { 1179 if (!IS_ERR(sta)) 1180 tx->sta = sta; 1181 } else { 1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1183 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1184 if (!tx->sta && sdata->wdev.use_4addr) 1185 return TX_DROP; 1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1187 IEEE80211_TX_CTL_INJECTED) || 1188 tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 qc = ieee80211_get_qos_ctl(hdr); 1202 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1203 1204 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1205 if (tid_tx) { 1206 bool queued; 1207 1208 queued = ieee80211_tx_prep_agg(tx, skb, info, 1209 tid_tx, tid); 1210 1211 if (unlikely(queued)) 1212 return TX_QUEUED; 1213 } 1214 } 1215 1216 if (is_multicast_ether_addr(hdr->addr1)) { 1217 tx->flags &= ~IEEE80211_TX_UNICAST; 1218 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1219 } else 1220 tx->flags |= IEEE80211_TX_UNICAST; 1221 1222 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1223 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1224 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1225 info->flags & IEEE80211_TX_CTL_AMPDU) 1226 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1227 } 1228 1229 if (!tx->sta) 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1231 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1233 ieee80211_check_fast_xmit(tx->sta); 1234 } 1235 1236 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1237 1238 return TX_CONTINUE; 1239 } 1240 1241 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1242 struct ieee80211_vif *vif, 1243 struct sta_info *sta, 1244 struct sk_buff *skb) 1245 { 1246 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1247 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1248 struct ieee80211_txq *txq = NULL; 1249 1250 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1251 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1252 return NULL; 1253 1254 if (!ieee80211_is_data(hdr->frame_control)) 1255 return NULL; 1256 1257 if (sta) { 1258 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1259 1260 if (!sta->uploaded) 1261 return NULL; 1262 1263 txq = sta->sta.txq[tid]; 1264 } else if (vif) { 1265 txq = vif->txq; 1266 } 1267 1268 if (!txq) 1269 return NULL; 1270 1271 return to_txq_info(txq); 1272 } 1273 1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1275 { 1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1277 } 1278 1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi) 1280 { 1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif; 1282 } 1283 1284 static u32 codel_skb_len_func(const struct sk_buff *skb) 1285 { 1286 return skb->len; 1287 } 1288 1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1290 { 1291 const struct ieee80211_tx_info *info; 1292 1293 info = (const struct ieee80211_tx_info *)skb->cb; 1294 return info->control.enqueue_time; 1295 } 1296 1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1298 void *ctx) 1299 { 1300 struct ieee80211_local *local; 1301 struct txq_info *txqi; 1302 struct fq *fq; 1303 struct fq_flow *flow; 1304 1305 txqi = ctx; 1306 local = vif_to_sdata(txqi->txq.vif)->local; 1307 fq = &local->fq; 1308 1309 if (cvars == &txqi->def_cvars) 1310 flow = &txqi->def_flow; 1311 else 1312 flow = &fq->flows[cvars - local->cvars]; 1313 1314 return fq_flow_dequeue(fq, flow); 1315 } 1316 1317 static void codel_drop_func(struct sk_buff *skb, 1318 void *ctx) 1319 { 1320 struct ieee80211_local *local; 1321 struct ieee80211_hw *hw; 1322 struct txq_info *txqi; 1323 1324 txqi = ctx; 1325 local = vif_to_sdata(txqi->txq.vif)->local; 1326 hw = &local->hw; 1327 1328 ieee80211_free_txskb(hw, skb); 1329 } 1330 1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1332 struct fq_tin *tin, 1333 struct fq_flow *flow) 1334 { 1335 struct ieee80211_local *local; 1336 struct txq_info *txqi; 1337 struct codel_vars *cvars; 1338 struct codel_params *cparams; 1339 struct codel_stats *cstats; 1340 1341 local = container_of(fq, struct ieee80211_local, fq); 1342 txqi = container_of(tin, struct txq_info, tin); 1343 cstats = &txqi->cstats; 1344 1345 if (txqi->txq.sta) { 1346 struct sta_info *sta = container_of(txqi->txq.sta, 1347 struct sta_info, sta); 1348 cparams = &sta->cparams; 1349 } else { 1350 cparams = &local->cparams; 1351 } 1352 1353 if (flow == &txqi->def_flow) 1354 cvars = &txqi->def_cvars; 1355 else 1356 cvars = &local->cvars[flow - fq->flows]; 1357 1358 return codel_dequeue(txqi, 1359 &flow->backlog, 1360 cparams, 1361 cvars, 1362 cstats, 1363 codel_skb_len_func, 1364 codel_skb_time_func, 1365 codel_drop_func, 1366 codel_dequeue_func); 1367 } 1368 1369 static void fq_skb_free_func(struct fq *fq, 1370 struct fq_tin *tin, 1371 struct fq_flow *flow, 1372 struct sk_buff *skb) 1373 { 1374 struct ieee80211_local *local; 1375 1376 local = container_of(fq, struct ieee80211_local, fq); 1377 ieee80211_free_txskb(&local->hw, skb); 1378 } 1379 1380 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1381 struct fq_tin *tin, 1382 int idx, 1383 struct sk_buff *skb) 1384 { 1385 struct txq_info *txqi; 1386 1387 txqi = container_of(tin, struct txq_info, tin); 1388 return &txqi->def_flow; 1389 } 1390 1391 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1392 struct txq_info *txqi, 1393 struct sk_buff *skb) 1394 { 1395 struct fq *fq = &local->fq; 1396 struct fq_tin *tin = &txqi->tin; 1397 1398 ieee80211_set_skb_enqueue_time(skb); 1399 fq_tin_enqueue(fq, tin, skb, 1400 fq_skb_free_func, 1401 fq_flow_get_default_func); 1402 } 1403 1404 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1405 struct sta_info *sta, 1406 struct txq_info *txqi, int tid) 1407 { 1408 fq_tin_init(&txqi->tin); 1409 fq_flow_init(&txqi->def_flow); 1410 codel_vars_init(&txqi->def_cvars); 1411 codel_stats_init(&txqi->cstats); 1412 __skb_queue_head_init(&txqi->frags); 1413 1414 txqi->txq.vif = &sdata->vif; 1415 1416 if (sta) { 1417 txqi->txq.sta = &sta->sta; 1418 sta->sta.txq[tid] = &txqi->txq; 1419 txqi->txq.tid = tid; 1420 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1421 } else { 1422 sdata->vif.txq = &txqi->txq; 1423 txqi->txq.tid = 0; 1424 txqi->txq.ac = IEEE80211_AC_BE; 1425 } 1426 } 1427 1428 void ieee80211_txq_purge(struct ieee80211_local *local, 1429 struct txq_info *txqi) 1430 { 1431 struct fq *fq = &local->fq; 1432 struct fq_tin *tin = &txqi->tin; 1433 1434 fq_tin_reset(fq, tin, fq_skb_free_func); 1435 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1436 } 1437 1438 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1439 { 1440 struct fq *fq = &local->fq; 1441 int ret; 1442 int i; 1443 bool supp_vht = false; 1444 enum nl80211_band band; 1445 1446 if (!local->ops->wake_tx_queue) 1447 return 0; 1448 1449 ret = fq_init(fq, 4096); 1450 if (ret) 1451 return ret; 1452 1453 /* 1454 * If the hardware doesn't support VHT, it is safe to limit the maximum 1455 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1456 */ 1457 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1458 struct ieee80211_supported_band *sband; 1459 1460 sband = local->hw.wiphy->bands[band]; 1461 if (!sband) 1462 continue; 1463 1464 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1465 } 1466 1467 if (!supp_vht) 1468 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1469 1470 codel_params_init(&local->cparams); 1471 local->cparams.interval = MS2TIME(100); 1472 local->cparams.target = MS2TIME(20); 1473 local->cparams.ecn = true; 1474 1475 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1476 GFP_KERNEL); 1477 if (!local->cvars) { 1478 spin_lock_bh(&fq->lock); 1479 fq_reset(fq, fq_skb_free_func); 1480 spin_unlock_bh(&fq->lock); 1481 return -ENOMEM; 1482 } 1483 1484 for (i = 0; i < fq->flows_cnt; i++) 1485 codel_vars_init(&local->cvars[i]); 1486 1487 return 0; 1488 } 1489 1490 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1491 { 1492 struct fq *fq = &local->fq; 1493 1494 if (!local->ops->wake_tx_queue) 1495 return; 1496 1497 kfree(local->cvars); 1498 local->cvars = NULL; 1499 1500 spin_lock_bh(&fq->lock); 1501 fq_reset(fq, fq_skb_free_func); 1502 spin_unlock_bh(&fq->lock); 1503 } 1504 1505 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1506 struct ieee80211_sub_if_data *sdata, 1507 struct sta_info *sta, 1508 struct sk_buff *skb) 1509 { 1510 struct fq *fq = &local->fq; 1511 struct ieee80211_vif *vif; 1512 struct txq_info *txqi; 1513 1514 if (!local->ops->wake_tx_queue || 1515 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1516 return false; 1517 1518 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1519 sdata = container_of(sdata->bss, 1520 struct ieee80211_sub_if_data, u.ap); 1521 1522 vif = &sdata->vif; 1523 txqi = ieee80211_get_txq(local, vif, sta, skb); 1524 1525 if (!txqi) 1526 return false; 1527 1528 spin_lock_bh(&fq->lock); 1529 ieee80211_txq_enqueue(local, txqi, skb); 1530 spin_unlock_bh(&fq->lock); 1531 1532 drv_wake_tx_queue(local, txqi); 1533 1534 return true; 1535 } 1536 1537 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1538 struct ieee80211_vif *vif, 1539 struct ieee80211_sta *sta, 1540 struct sk_buff_head *skbs, 1541 bool txpending) 1542 { 1543 struct ieee80211_tx_control control = {}; 1544 struct sk_buff *skb, *tmp; 1545 unsigned long flags; 1546 1547 skb_queue_walk_safe(skbs, skb, tmp) { 1548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1549 int q = info->hw_queue; 1550 1551 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1552 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1553 __skb_unlink(skb, skbs); 1554 ieee80211_free_txskb(&local->hw, skb); 1555 continue; 1556 } 1557 #endif 1558 1559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1560 if (local->queue_stop_reasons[q] || 1561 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1562 if (unlikely(info->flags & 1563 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1564 if (local->queue_stop_reasons[q] & 1565 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1566 /* 1567 * Drop off-channel frames if queues 1568 * are stopped for any reason other 1569 * than off-channel operation. Never 1570 * queue them. 1571 */ 1572 spin_unlock_irqrestore( 1573 &local->queue_stop_reason_lock, 1574 flags); 1575 ieee80211_purge_tx_queue(&local->hw, 1576 skbs); 1577 return true; 1578 } 1579 } else { 1580 1581 /* 1582 * Since queue is stopped, queue up frames for 1583 * later transmission from the tx-pending 1584 * tasklet when the queue is woken again. 1585 */ 1586 if (txpending) 1587 skb_queue_splice_init(skbs, 1588 &local->pending[q]); 1589 else 1590 skb_queue_splice_tail_init(skbs, 1591 &local->pending[q]); 1592 1593 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1594 flags); 1595 return false; 1596 } 1597 } 1598 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1599 1600 info->control.vif = vif; 1601 control.sta = sta; 1602 1603 __skb_unlink(skb, skbs); 1604 drv_tx(local, &control, skb); 1605 } 1606 1607 return true; 1608 } 1609 1610 /* 1611 * Returns false if the frame couldn't be transmitted but was queued instead. 1612 */ 1613 static bool __ieee80211_tx(struct ieee80211_local *local, 1614 struct sk_buff_head *skbs, int led_len, 1615 struct sta_info *sta, bool txpending) 1616 { 1617 struct ieee80211_tx_info *info; 1618 struct ieee80211_sub_if_data *sdata; 1619 struct ieee80211_vif *vif; 1620 struct ieee80211_sta *pubsta; 1621 struct sk_buff *skb; 1622 bool result = true; 1623 __le16 fc; 1624 1625 if (WARN_ON(skb_queue_empty(skbs))) 1626 return true; 1627 1628 skb = skb_peek(skbs); 1629 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1630 info = IEEE80211_SKB_CB(skb); 1631 sdata = vif_to_sdata(info->control.vif); 1632 if (sta && !sta->uploaded) 1633 sta = NULL; 1634 1635 if (sta) 1636 pubsta = &sta->sta; 1637 else 1638 pubsta = NULL; 1639 1640 switch (sdata->vif.type) { 1641 case NL80211_IFTYPE_MONITOR: 1642 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1643 vif = &sdata->vif; 1644 break; 1645 } 1646 sdata = rcu_dereference(local->monitor_sdata); 1647 if (sdata) { 1648 vif = &sdata->vif; 1649 info->hw_queue = 1650 vif->hw_queue[skb_get_queue_mapping(skb)]; 1651 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1652 ieee80211_purge_tx_queue(&local->hw, skbs); 1653 return true; 1654 } else 1655 vif = NULL; 1656 break; 1657 case NL80211_IFTYPE_AP_VLAN: 1658 sdata = container_of(sdata->bss, 1659 struct ieee80211_sub_if_data, u.ap); 1660 /* fall through */ 1661 default: 1662 vif = &sdata->vif; 1663 break; 1664 } 1665 1666 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1667 txpending); 1668 1669 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1670 1671 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1672 1673 return result; 1674 } 1675 1676 /* 1677 * Invoke TX handlers, return 0 on success and non-zero if the 1678 * frame was dropped or queued. 1679 * 1680 * The handlers are split into an early and late part. The latter is everything 1681 * that can be sensitive to reordering, and will be deferred to after packets 1682 * are dequeued from the intermediate queues (when they are enabled). 1683 */ 1684 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1685 { 1686 ieee80211_tx_result res = TX_DROP; 1687 1688 #define CALL_TXH(txh) \ 1689 do { \ 1690 res = txh(tx); \ 1691 if (res != TX_CONTINUE) \ 1692 goto txh_done; \ 1693 } while (0) 1694 1695 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1696 CALL_TXH(ieee80211_tx_h_check_assoc); 1697 CALL_TXH(ieee80211_tx_h_ps_buf); 1698 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1699 CALL_TXH(ieee80211_tx_h_select_key); 1700 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1701 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1702 1703 txh_done: 1704 if (unlikely(res == TX_DROP)) { 1705 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1706 if (tx->skb) 1707 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1708 else 1709 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1710 return -1; 1711 } else if (unlikely(res == TX_QUEUED)) { 1712 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1713 return -1; 1714 } 1715 1716 return 0; 1717 } 1718 1719 /* 1720 * Late handlers can be called while the sta lock is held. Handlers that can 1721 * cause packets to be generated will cause deadlock! 1722 */ 1723 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1724 { 1725 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1726 ieee80211_tx_result res = TX_CONTINUE; 1727 1728 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1729 __skb_queue_tail(&tx->skbs, tx->skb); 1730 tx->skb = NULL; 1731 goto txh_done; 1732 } 1733 1734 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1735 CALL_TXH(ieee80211_tx_h_sequence); 1736 CALL_TXH(ieee80211_tx_h_fragment); 1737 /* handlers after fragment must be aware of tx info fragmentation! */ 1738 CALL_TXH(ieee80211_tx_h_stats); 1739 CALL_TXH(ieee80211_tx_h_encrypt); 1740 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1741 CALL_TXH(ieee80211_tx_h_calculate_duration); 1742 #undef CALL_TXH 1743 1744 txh_done: 1745 if (unlikely(res == TX_DROP)) { 1746 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1747 if (tx->skb) 1748 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1749 else 1750 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1751 return -1; 1752 } else if (unlikely(res == TX_QUEUED)) { 1753 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1754 return -1; 1755 } 1756 1757 return 0; 1758 } 1759 1760 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1761 { 1762 int r = invoke_tx_handlers_early(tx); 1763 1764 if (r) 1765 return r; 1766 return invoke_tx_handlers_late(tx); 1767 } 1768 1769 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1770 struct ieee80211_vif *vif, struct sk_buff *skb, 1771 int band, struct ieee80211_sta **sta) 1772 { 1773 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1774 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1775 struct ieee80211_tx_data tx; 1776 struct sk_buff *skb2; 1777 1778 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1779 return false; 1780 1781 info->band = band; 1782 info->control.vif = vif; 1783 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1784 1785 if (invoke_tx_handlers(&tx)) 1786 return false; 1787 1788 if (sta) { 1789 if (tx.sta) 1790 *sta = &tx.sta->sta; 1791 else 1792 *sta = NULL; 1793 } 1794 1795 /* this function isn't suitable for fragmented data frames */ 1796 skb2 = __skb_dequeue(&tx.skbs); 1797 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1798 ieee80211_free_txskb(hw, skb2); 1799 ieee80211_purge_tx_queue(hw, &tx.skbs); 1800 return false; 1801 } 1802 1803 return true; 1804 } 1805 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1806 1807 /* 1808 * Returns false if the frame couldn't be transmitted but was queued instead. 1809 */ 1810 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1811 struct sta_info *sta, struct sk_buff *skb, 1812 bool txpending) 1813 { 1814 struct ieee80211_local *local = sdata->local; 1815 struct ieee80211_tx_data tx; 1816 ieee80211_tx_result res_prepare; 1817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1818 bool result = true; 1819 int led_len; 1820 1821 if (unlikely(skb->len < 10)) { 1822 dev_kfree_skb(skb); 1823 return true; 1824 } 1825 1826 /* initialises tx */ 1827 led_len = skb->len; 1828 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1829 1830 if (unlikely(res_prepare == TX_DROP)) { 1831 ieee80211_free_txskb(&local->hw, skb); 1832 return true; 1833 } else if (unlikely(res_prepare == TX_QUEUED)) { 1834 return true; 1835 } 1836 1837 /* set up hw_queue value early */ 1838 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1839 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1840 info->hw_queue = 1841 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1842 1843 if (invoke_tx_handlers_early(&tx)) 1844 return false; 1845 1846 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1847 return true; 1848 1849 if (!invoke_tx_handlers_late(&tx)) 1850 result = __ieee80211_tx(local, &tx.skbs, led_len, 1851 tx.sta, txpending); 1852 1853 return result; 1854 } 1855 1856 /* device xmit handlers */ 1857 1858 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1859 struct sk_buff *skb, 1860 int head_need, bool may_encrypt) 1861 { 1862 struct ieee80211_local *local = sdata->local; 1863 int tail_need = 0; 1864 1865 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1866 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1867 tail_need -= skb_tailroom(skb); 1868 tail_need = max_t(int, tail_need, 0); 1869 } 1870 1871 if (skb_cloned(skb) && 1872 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1873 !skb_clone_writable(skb, ETH_HLEN) || 1874 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1875 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1876 else if (head_need || tail_need) 1877 I802_DEBUG_INC(local->tx_expand_skb_head); 1878 else 1879 return 0; 1880 1881 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1882 wiphy_debug(local->hw.wiphy, 1883 "failed to reallocate TX buffer\n"); 1884 return -ENOMEM; 1885 } 1886 1887 return 0; 1888 } 1889 1890 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1891 struct sta_info *sta, struct sk_buff *skb) 1892 { 1893 struct ieee80211_local *local = sdata->local; 1894 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1896 int headroom; 1897 bool may_encrypt; 1898 1899 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1900 1901 headroom = local->tx_headroom; 1902 if (may_encrypt) 1903 headroom += sdata->encrypt_headroom; 1904 headroom -= skb_headroom(skb); 1905 headroom = max_t(int, 0, headroom); 1906 1907 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1908 ieee80211_free_txskb(&local->hw, skb); 1909 return; 1910 } 1911 1912 hdr = (struct ieee80211_hdr *) skb->data; 1913 info->control.vif = &sdata->vif; 1914 1915 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1916 if (ieee80211_is_data(hdr->frame_control) && 1917 is_unicast_ether_addr(hdr->addr1)) { 1918 if (mesh_nexthop_resolve(sdata, skb)) 1919 return; /* skb queued: don't free */ 1920 } else { 1921 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1922 } 1923 } 1924 1925 ieee80211_set_qos_hdr(sdata, skb); 1926 ieee80211_tx(sdata, sta, skb, false); 1927 } 1928 1929 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1930 struct sk_buff *skb) 1931 { 1932 struct ieee80211_radiotap_iterator iterator; 1933 struct ieee80211_radiotap_header *rthdr = 1934 (struct ieee80211_radiotap_header *) skb->data; 1935 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1936 struct ieee80211_supported_band *sband = 1937 local->hw.wiphy->bands[info->band]; 1938 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1939 NULL); 1940 u16 txflags; 1941 u16 rate = 0; 1942 bool rate_found = false; 1943 u8 rate_retries = 0; 1944 u16 rate_flags = 0; 1945 u8 mcs_known, mcs_flags, mcs_bw; 1946 u16 vht_known; 1947 u8 vht_mcs = 0, vht_nss = 0; 1948 int i; 1949 1950 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1951 IEEE80211_TX_CTL_DONTFRAG; 1952 1953 /* 1954 * for every radiotap entry that is present 1955 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1956 * entries present, or -EINVAL on error) 1957 */ 1958 1959 while (!ret) { 1960 ret = ieee80211_radiotap_iterator_next(&iterator); 1961 1962 if (ret) 1963 continue; 1964 1965 /* see if this argument is something we can use */ 1966 switch (iterator.this_arg_index) { 1967 /* 1968 * You must take care when dereferencing iterator.this_arg 1969 * for multibyte types... the pointer is not aligned. Use 1970 * get_unaligned((type *)iterator.this_arg) to dereference 1971 * iterator.this_arg for type "type" safely on all arches. 1972 */ 1973 case IEEE80211_RADIOTAP_FLAGS: 1974 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1975 /* 1976 * this indicates that the skb we have been 1977 * handed has the 32-bit FCS CRC at the end... 1978 * we should react to that by snipping it off 1979 * because it will be recomputed and added 1980 * on transmission 1981 */ 1982 if (skb->len < (iterator._max_length + FCS_LEN)) 1983 return false; 1984 1985 skb_trim(skb, skb->len - FCS_LEN); 1986 } 1987 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1988 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1990 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1991 break; 1992 1993 case IEEE80211_RADIOTAP_TX_FLAGS: 1994 txflags = get_unaligned_le16(iterator.this_arg); 1995 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1996 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1997 break; 1998 1999 case IEEE80211_RADIOTAP_RATE: 2000 rate = *iterator.this_arg; 2001 rate_flags = 0; 2002 rate_found = true; 2003 break; 2004 2005 case IEEE80211_RADIOTAP_DATA_RETRIES: 2006 rate_retries = *iterator.this_arg; 2007 break; 2008 2009 case IEEE80211_RADIOTAP_MCS: 2010 mcs_known = iterator.this_arg[0]; 2011 mcs_flags = iterator.this_arg[1]; 2012 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2013 break; 2014 2015 rate_found = true; 2016 rate = iterator.this_arg[2]; 2017 rate_flags = IEEE80211_TX_RC_MCS; 2018 2019 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2020 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2021 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2022 2023 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2024 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2025 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2026 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2027 break; 2028 2029 case IEEE80211_RADIOTAP_VHT: 2030 vht_known = get_unaligned_le16(iterator.this_arg); 2031 rate_found = true; 2032 2033 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2034 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2035 (iterator.this_arg[2] & 2036 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2037 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2038 if (vht_known & 2039 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2040 if (iterator.this_arg[3] == 1) 2041 rate_flags |= 2042 IEEE80211_TX_RC_40_MHZ_WIDTH; 2043 else if (iterator.this_arg[3] == 4) 2044 rate_flags |= 2045 IEEE80211_TX_RC_80_MHZ_WIDTH; 2046 else if (iterator.this_arg[3] == 11) 2047 rate_flags |= 2048 IEEE80211_TX_RC_160_MHZ_WIDTH; 2049 } 2050 2051 vht_mcs = iterator.this_arg[4] >> 4; 2052 vht_nss = iterator.this_arg[4] & 0xF; 2053 break; 2054 2055 /* 2056 * Please update the file 2057 * Documentation/networking/mac80211-injection.txt 2058 * when parsing new fields here. 2059 */ 2060 2061 default: 2062 break; 2063 } 2064 } 2065 2066 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2067 return false; 2068 2069 if (rate_found) { 2070 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2071 2072 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2073 info->control.rates[i].idx = -1; 2074 info->control.rates[i].flags = 0; 2075 info->control.rates[i].count = 0; 2076 } 2077 2078 if (rate_flags & IEEE80211_TX_RC_MCS) { 2079 info->control.rates[0].idx = rate; 2080 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2081 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2082 vht_nss); 2083 } else { 2084 for (i = 0; i < sband->n_bitrates; i++) { 2085 if (rate * 5 != sband->bitrates[i].bitrate) 2086 continue; 2087 2088 info->control.rates[0].idx = i; 2089 break; 2090 } 2091 } 2092 2093 if (info->control.rates[0].idx < 0) 2094 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2095 2096 info->control.rates[0].flags = rate_flags; 2097 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2098 local->hw.max_rate_tries); 2099 } 2100 2101 /* 2102 * remove the radiotap header 2103 * iterator->_max_length was sanity-checked against 2104 * skb->len by iterator init 2105 */ 2106 skb_pull(skb, iterator._max_length); 2107 2108 return true; 2109 } 2110 2111 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2112 struct net_device *dev) 2113 { 2114 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2115 struct ieee80211_chanctx_conf *chanctx_conf; 2116 struct ieee80211_radiotap_header *prthdr = 2117 (struct ieee80211_radiotap_header *)skb->data; 2118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2119 struct ieee80211_hdr *hdr; 2120 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2121 struct cfg80211_chan_def *chandef; 2122 u16 len_rthdr; 2123 int hdrlen; 2124 2125 /* check for not even having the fixed radiotap header part */ 2126 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2127 goto fail; /* too short to be possibly valid */ 2128 2129 /* is it a header version we can trust to find length from? */ 2130 if (unlikely(prthdr->it_version)) 2131 goto fail; /* only version 0 is supported */ 2132 2133 /* then there must be a radiotap header with a length we can use */ 2134 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2135 2136 /* does the skb contain enough to deliver on the alleged length? */ 2137 if (unlikely(skb->len < len_rthdr)) 2138 goto fail; /* skb too short for claimed rt header extent */ 2139 2140 /* 2141 * fix up the pointers accounting for the radiotap 2142 * header still being in there. We are being given 2143 * a precooked IEEE80211 header so no need for 2144 * normal processing 2145 */ 2146 skb_set_mac_header(skb, len_rthdr); 2147 /* 2148 * these are just fixed to the end of the rt area since we 2149 * don't have any better information and at this point, nobody cares 2150 */ 2151 skb_set_network_header(skb, len_rthdr); 2152 skb_set_transport_header(skb, len_rthdr); 2153 2154 if (skb->len < len_rthdr + 2) 2155 goto fail; 2156 2157 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2158 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2159 2160 if (skb->len < len_rthdr + hdrlen) 2161 goto fail; 2162 2163 /* 2164 * Initialize skb->protocol if the injected frame is a data frame 2165 * carrying a rfc1042 header 2166 */ 2167 if (ieee80211_is_data(hdr->frame_control) && 2168 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2169 u8 *payload = (u8 *)hdr + hdrlen; 2170 2171 if (ether_addr_equal(payload, rfc1042_header)) 2172 skb->protocol = cpu_to_be16((payload[6] << 8) | 2173 payload[7]); 2174 } 2175 2176 memset(info, 0, sizeof(*info)); 2177 2178 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2179 IEEE80211_TX_CTL_INJECTED; 2180 2181 rcu_read_lock(); 2182 2183 /* 2184 * We process outgoing injected frames that have a local address 2185 * we handle as though they are non-injected frames. 2186 * This code here isn't entirely correct, the local MAC address 2187 * isn't always enough to find the interface to use; for proper 2188 * VLAN/WDS support we will need a different mechanism (which 2189 * likely isn't going to be monitor interfaces). 2190 */ 2191 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2192 2193 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2194 if (!ieee80211_sdata_running(tmp_sdata)) 2195 continue; 2196 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2197 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2198 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2199 continue; 2200 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2201 sdata = tmp_sdata; 2202 break; 2203 } 2204 } 2205 2206 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2207 if (!chanctx_conf) { 2208 tmp_sdata = rcu_dereference(local->monitor_sdata); 2209 if (tmp_sdata) 2210 chanctx_conf = 2211 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2212 } 2213 2214 if (chanctx_conf) 2215 chandef = &chanctx_conf->def; 2216 else if (!local->use_chanctx) 2217 chandef = &local->_oper_chandef; 2218 else 2219 goto fail_rcu; 2220 2221 /* 2222 * Frame injection is not allowed if beaconing is not allowed 2223 * or if we need radar detection. Beaconing is usually not allowed when 2224 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2225 * Passive scan is also used in world regulatory domains where 2226 * your country is not known and as such it should be treated as 2227 * NO TX unless the channel is explicitly allowed in which case 2228 * your current regulatory domain would not have the passive scan 2229 * flag. 2230 * 2231 * Since AP mode uses monitor interfaces to inject/TX management 2232 * frames we can make AP mode the exception to this rule once it 2233 * supports radar detection as its implementation can deal with 2234 * radar detection by itself. We can do that later by adding a 2235 * monitor flag interfaces used for AP support. 2236 */ 2237 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2238 sdata->vif.type)) 2239 goto fail_rcu; 2240 2241 info->band = chandef->chan->band; 2242 2243 /* process and remove the injection radiotap header */ 2244 if (!ieee80211_parse_tx_radiotap(local, skb)) 2245 goto fail_rcu; 2246 2247 ieee80211_xmit(sdata, NULL, skb); 2248 rcu_read_unlock(); 2249 2250 return NETDEV_TX_OK; 2251 2252 fail_rcu: 2253 rcu_read_unlock(); 2254 fail: 2255 dev_kfree_skb(skb); 2256 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2257 } 2258 2259 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2260 { 2261 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2262 2263 return ethertype == ETH_P_TDLS && 2264 skb->len > 14 && 2265 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2266 } 2267 2268 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2269 struct sk_buff *skb, 2270 struct sta_info **sta_out) 2271 { 2272 struct sta_info *sta; 2273 2274 switch (sdata->vif.type) { 2275 case NL80211_IFTYPE_AP_VLAN: 2276 sta = rcu_dereference(sdata->u.vlan.sta); 2277 if (sta) { 2278 *sta_out = sta; 2279 return 0; 2280 } else if (sdata->wdev.use_4addr) { 2281 return -ENOLINK; 2282 } 2283 /* fall through */ 2284 case NL80211_IFTYPE_AP: 2285 case NL80211_IFTYPE_OCB: 2286 case NL80211_IFTYPE_ADHOC: 2287 if (is_multicast_ether_addr(skb->data)) { 2288 *sta_out = ERR_PTR(-ENOENT); 2289 return 0; 2290 } 2291 sta = sta_info_get_bss(sdata, skb->data); 2292 break; 2293 case NL80211_IFTYPE_WDS: 2294 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2295 break; 2296 #ifdef CONFIG_MAC80211_MESH 2297 case NL80211_IFTYPE_MESH_POINT: 2298 /* determined much later */ 2299 *sta_out = NULL; 2300 return 0; 2301 #endif 2302 case NL80211_IFTYPE_STATION: 2303 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2304 sta = sta_info_get(sdata, skb->data); 2305 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2306 if (test_sta_flag(sta, 2307 WLAN_STA_TDLS_PEER_AUTH)) { 2308 *sta_out = sta; 2309 return 0; 2310 } 2311 2312 /* 2313 * TDLS link during setup - throw out frames to 2314 * peer. Allow TDLS-setup frames to unauthorized 2315 * peers for the special case of a link teardown 2316 * after a TDLS sta is removed due to being 2317 * unreachable. 2318 */ 2319 if (!ieee80211_is_tdls_setup(skb)) 2320 return -EINVAL; 2321 } 2322 2323 } 2324 2325 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2326 if (!sta) 2327 return -ENOLINK; 2328 break; 2329 default: 2330 return -EINVAL; 2331 } 2332 2333 *sta_out = sta ?: ERR_PTR(-ENOENT); 2334 return 0; 2335 } 2336 2337 /** 2338 * ieee80211_build_hdr - build 802.11 header in the given frame 2339 * @sdata: virtual interface to build the header for 2340 * @skb: the skb to build the header in 2341 * @info_flags: skb flags to set 2342 * 2343 * This function takes the skb with 802.3 header and reformats the header to 2344 * the appropriate IEEE 802.11 header based on which interface the packet is 2345 * being transmitted on. 2346 * 2347 * Note that this function also takes care of the TX status request and 2348 * potential unsharing of the SKB - this needs to be interleaved with the 2349 * header building. 2350 * 2351 * The function requires the read-side RCU lock held 2352 * 2353 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2354 */ 2355 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2356 struct sk_buff *skb, u32 info_flags, 2357 struct sta_info *sta) 2358 { 2359 struct ieee80211_local *local = sdata->local; 2360 struct ieee80211_tx_info *info; 2361 int head_need; 2362 u16 ethertype, hdrlen, meshhdrlen = 0; 2363 __le16 fc; 2364 struct ieee80211_hdr hdr; 2365 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2366 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2367 const u8 *encaps_data; 2368 int encaps_len, skip_header_bytes; 2369 bool wme_sta = false, authorized = false; 2370 bool tdls_peer; 2371 bool multicast; 2372 u16 info_id = 0; 2373 struct ieee80211_chanctx_conf *chanctx_conf; 2374 struct ieee80211_sub_if_data *ap_sdata; 2375 enum nl80211_band band; 2376 int ret; 2377 2378 if (IS_ERR(sta)) 2379 sta = NULL; 2380 2381 /* convert Ethernet header to proper 802.11 header (based on 2382 * operation mode) */ 2383 ethertype = (skb->data[12] << 8) | skb->data[13]; 2384 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2385 2386 switch (sdata->vif.type) { 2387 case NL80211_IFTYPE_AP_VLAN: 2388 if (sdata->wdev.use_4addr) { 2389 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2390 /* RA TA DA SA */ 2391 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2392 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2393 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2394 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2395 hdrlen = 30; 2396 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2397 wme_sta = sta->sta.wme; 2398 } 2399 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2400 u.ap); 2401 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2402 if (!chanctx_conf) { 2403 ret = -ENOTCONN; 2404 goto free; 2405 } 2406 band = chanctx_conf->def.chan->band; 2407 if (sdata->wdev.use_4addr) 2408 break; 2409 /* fall through */ 2410 case NL80211_IFTYPE_AP: 2411 if (sdata->vif.type == NL80211_IFTYPE_AP) 2412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2413 if (!chanctx_conf) { 2414 ret = -ENOTCONN; 2415 goto free; 2416 } 2417 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2418 /* DA BSSID SA */ 2419 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2420 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2422 hdrlen = 24; 2423 band = chanctx_conf->def.chan->band; 2424 break; 2425 case NL80211_IFTYPE_WDS: 2426 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2427 /* RA TA DA SA */ 2428 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2429 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2430 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2431 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2432 hdrlen = 30; 2433 /* 2434 * This is the exception! WDS style interfaces are prohibited 2435 * when channel contexts are in used so this must be valid 2436 */ 2437 band = local->hw.conf.chandef.chan->band; 2438 break; 2439 #ifdef CONFIG_MAC80211_MESH 2440 case NL80211_IFTYPE_MESH_POINT: 2441 if (!is_multicast_ether_addr(skb->data)) { 2442 struct sta_info *next_hop; 2443 bool mpp_lookup = true; 2444 2445 mpath = mesh_path_lookup(sdata, skb->data); 2446 if (mpath) { 2447 mpp_lookup = false; 2448 next_hop = rcu_dereference(mpath->next_hop); 2449 if (!next_hop || 2450 !(mpath->flags & (MESH_PATH_ACTIVE | 2451 MESH_PATH_RESOLVING))) 2452 mpp_lookup = true; 2453 } 2454 2455 if (mpp_lookup) { 2456 mppath = mpp_path_lookup(sdata, skb->data); 2457 if (mppath) 2458 mppath->exp_time = jiffies; 2459 } 2460 2461 if (mppath && mpath) 2462 mesh_path_del(sdata, mpath->dst); 2463 } 2464 2465 /* 2466 * Use address extension if it is a packet from 2467 * another interface or if we know the destination 2468 * is being proxied by a portal (i.e. portal address 2469 * differs from proxied address) 2470 */ 2471 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2472 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2473 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2474 skb->data, skb->data + ETH_ALEN); 2475 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2476 NULL, NULL); 2477 } else { 2478 /* DS -> MBSS (802.11-2012 13.11.3.3). 2479 * For unicast with unknown forwarding information, 2480 * destination might be in the MBSS or if that fails 2481 * forwarded to another mesh gate. In either case 2482 * resolution will be handled in ieee80211_xmit(), so 2483 * leave the original DA. This also works for mcast */ 2484 const u8 *mesh_da = skb->data; 2485 2486 if (mppath) 2487 mesh_da = mppath->mpp; 2488 else if (mpath) 2489 mesh_da = mpath->dst; 2490 2491 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2492 mesh_da, sdata->vif.addr); 2493 if (is_multicast_ether_addr(mesh_da)) 2494 /* DA TA mSA AE:SA */ 2495 meshhdrlen = ieee80211_new_mesh_header( 2496 sdata, &mesh_hdr, 2497 skb->data + ETH_ALEN, NULL); 2498 else 2499 /* RA TA mDA mSA AE:DA SA */ 2500 meshhdrlen = ieee80211_new_mesh_header( 2501 sdata, &mesh_hdr, skb->data, 2502 skb->data + ETH_ALEN); 2503 2504 } 2505 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2506 if (!chanctx_conf) { 2507 ret = -ENOTCONN; 2508 goto free; 2509 } 2510 band = chanctx_conf->def.chan->band; 2511 break; 2512 #endif 2513 case NL80211_IFTYPE_STATION: 2514 /* we already did checks when looking up the RA STA */ 2515 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2516 2517 if (tdls_peer) { 2518 /* DA SA BSSID */ 2519 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2520 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2521 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2522 hdrlen = 24; 2523 } else if (sdata->u.mgd.use_4addr && 2524 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2525 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2526 IEEE80211_FCTL_TODS); 2527 /* RA TA DA SA */ 2528 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2529 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2530 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2531 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2532 hdrlen = 30; 2533 } else { 2534 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2535 /* BSSID SA DA */ 2536 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2537 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2538 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2539 hdrlen = 24; 2540 } 2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2542 if (!chanctx_conf) { 2543 ret = -ENOTCONN; 2544 goto free; 2545 } 2546 band = chanctx_conf->def.chan->band; 2547 break; 2548 case NL80211_IFTYPE_OCB: 2549 /* DA SA BSSID */ 2550 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2551 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2552 eth_broadcast_addr(hdr.addr3); 2553 hdrlen = 24; 2554 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2555 if (!chanctx_conf) { 2556 ret = -ENOTCONN; 2557 goto free; 2558 } 2559 band = chanctx_conf->def.chan->band; 2560 break; 2561 case NL80211_IFTYPE_ADHOC: 2562 /* DA SA BSSID */ 2563 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2565 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2566 hdrlen = 24; 2567 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2568 if (!chanctx_conf) { 2569 ret = -ENOTCONN; 2570 goto free; 2571 } 2572 band = chanctx_conf->def.chan->band; 2573 break; 2574 default: 2575 ret = -EINVAL; 2576 goto free; 2577 } 2578 2579 multicast = is_multicast_ether_addr(hdr.addr1); 2580 2581 /* sta is always NULL for mesh */ 2582 if (sta) { 2583 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2584 wme_sta = sta->sta.wme; 2585 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2586 /* For mesh, the use of the QoS header is mandatory */ 2587 wme_sta = true; 2588 } 2589 2590 /* receiver does QoS (which also means we do) use it */ 2591 if (wme_sta) { 2592 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2593 hdrlen += 2; 2594 } 2595 2596 /* 2597 * Drop unicast frames to unauthorised stations unless they are 2598 * EAPOL frames from the local station. 2599 */ 2600 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2601 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2602 !multicast && !authorized && 2603 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2604 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2605 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2606 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2607 sdata->name, hdr.addr1); 2608 #endif 2609 2610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2611 2612 ret = -EPERM; 2613 goto free; 2614 } 2615 2616 if (unlikely(!multicast && skb->sk && 2617 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2618 struct sk_buff *ack_skb = skb_clone_sk(skb); 2619 2620 if (ack_skb) { 2621 unsigned long flags; 2622 int id; 2623 2624 spin_lock_irqsave(&local->ack_status_lock, flags); 2625 id = idr_alloc(&local->ack_status_frames, ack_skb, 2626 1, 0x10000, GFP_ATOMIC); 2627 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2628 2629 if (id >= 0) { 2630 info_id = id; 2631 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2632 } else { 2633 kfree_skb(ack_skb); 2634 } 2635 } 2636 } 2637 2638 /* 2639 * If the skb is shared we need to obtain our own copy. 2640 */ 2641 if (skb_shared(skb)) { 2642 struct sk_buff *tmp_skb = skb; 2643 2644 /* can't happen -- skb is a clone if info_id != 0 */ 2645 WARN_ON(info_id); 2646 2647 skb = skb_clone(skb, GFP_ATOMIC); 2648 kfree_skb(tmp_skb); 2649 2650 if (!skb) { 2651 ret = -ENOMEM; 2652 goto free; 2653 } 2654 } 2655 2656 hdr.frame_control = fc; 2657 hdr.duration_id = 0; 2658 hdr.seq_ctrl = 0; 2659 2660 skip_header_bytes = ETH_HLEN; 2661 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2662 encaps_data = bridge_tunnel_header; 2663 encaps_len = sizeof(bridge_tunnel_header); 2664 skip_header_bytes -= 2; 2665 } else if (ethertype >= ETH_P_802_3_MIN) { 2666 encaps_data = rfc1042_header; 2667 encaps_len = sizeof(rfc1042_header); 2668 skip_header_bytes -= 2; 2669 } else { 2670 encaps_data = NULL; 2671 encaps_len = 0; 2672 } 2673 2674 skb_pull(skb, skip_header_bytes); 2675 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2676 2677 /* 2678 * So we need to modify the skb header and hence need a copy of 2679 * that. The head_need variable above doesn't, so far, include 2680 * the needed header space that we don't need right away. If we 2681 * can, then we don't reallocate right now but only after the 2682 * frame arrives at the master device (if it does...) 2683 * 2684 * If we cannot, however, then we will reallocate to include all 2685 * the ever needed space. Also, if we need to reallocate it anyway, 2686 * make it big enough for everything we may ever need. 2687 */ 2688 2689 if (head_need > 0 || skb_cloned(skb)) { 2690 head_need += sdata->encrypt_headroom; 2691 head_need += local->tx_headroom; 2692 head_need = max_t(int, 0, head_need); 2693 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2694 ieee80211_free_txskb(&local->hw, skb); 2695 skb = NULL; 2696 return ERR_PTR(-ENOMEM); 2697 } 2698 } 2699 2700 if (encaps_data) 2701 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2702 2703 #ifdef CONFIG_MAC80211_MESH 2704 if (meshhdrlen > 0) 2705 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2706 #endif 2707 2708 if (ieee80211_is_data_qos(fc)) { 2709 __le16 *qos_control; 2710 2711 qos_control = skb_push(skb, 2); 2712 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2713 /* 2714 * Maybe we could actually set some fields here, for now just 2715 * initialise to zero to indicate no special operation. 2716 */ 2717 *qos_control = 0; 2718 } else 2719 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2720 2721 skb_reset_mac_header(skb); 2722 2723 info = IEEE80211_SKB_CB(skb); 2724 memset(info, 0, sizeof(*info)); 2725 2726 info->flags = info_flags; 2727 info->ack_frame_id = info_id; 2728 info->band = band; 2729 2730 return skb; 2731 free: 2732 kfree_skb(skb); 2733 return ERR_PTR(ret); 2734 } 2735 2736 /* 2737 * fast-xmit overview 2738 * 2739 * The core idea of this fast-xmit is to remove per-packet checks by checking 2740 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2741 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2742 * much less work can be done per packet. For example, fragmentation must be 2743 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2744 * in the code here. 2745 * 2746 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2747 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2748 * 2749 * The most difficult part of this is that when any of these assumptions 2750 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2751 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2752 * since the per-packet code no longer checks the conditions. This is reflected 2753 * by the calls to these functions throughout the rest of the code, and must be 2754 * maintained if any of the TX path checks change. 2755 */ 2756 2757 void ieee80211_check_fast_xmit(struct sta_info *sta) 2758 { 2759 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2760 struct ieee80211_local *local = sta->local; 2761 struct ieee80211_sub_if_data *sdata = sta->sdata; 2762 struct ieee80211_hdr *hdr = (void *)build.hdr; 2763 struct ieee80211_chanctx_conf *chanctx_conf; 2764 __le16 fc; 2765 2766 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2767 return; 2768 2769 /* Locking here protects both the pointer itself, and against concurrent 2770 * invocations winning data access races to, e.g., the key pointer that 2771 * is used. 2772 * Without it, the invocation of this function right after the key 2773 * pointer changes wouldn't be sufficient, as another CPU could access 2774 * the pointer, then stall, and then do the cache update after the CPU 2775 * that invalidated the key. 2776 * With the locking, such scenarios cannot happen as the check for the 2777 * key and the fast-tx assignment are done atomically, so the CPU that 2778 * modifies the key will either wait or other one will see the key 2779 * cleared/changed already. 2780 */ 2781 spin_lock_bh(&sta->lock); 2782 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2783 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2784 sdata->vif.type == NL80211_IFTYPE_STATION) 2785 goto out; 2786 2787 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2788 goto out; 2789 2790 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2791 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2792 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2793 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2794 goto out; 2795 2796 if (sdata->noack_map) 2797 goto out; 2798 2799 /* fast-xmit doesn't handle fragmentation at all */ 2800 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2801 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2802 goto out; 2803 2804 rcu_read_lock(); 2805 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2806 if (!chanctx_conf) { 2807 rcu_read_unlock(); 2808 goto out; 2809 } 2810 build.band = chanctx_conf->def.chan->band; 2811 rcu_read_unlock(); 2812 2813 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2814 2815 switch (sdata->vif.type) { 2816 case NL80211_IFTYPE_ADHOC: 2817 /* DA SA BSSID */ 2818 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2819 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2820 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2821 build.hdr_len = 24; 2822 break; 2823 case NL80211_IFTYPE_STATION: 2824 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2825 /* DA SA BSSID */ 2826 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2827 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2828 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2829 build.hdr_len = 24; 2830 break; 2831 } 2832 2833 if (sdata->u.mgd.use_4addr) { 2834 /* non-regular ethertype cannot use the fastpath */ 2835 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2836 IEEE80211_FCTL_TODS); 2837 /* RA TA DA SA */ 2838 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2839 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2840 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2841 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2842 build.hdr_len = 30; 2843 break; 2844 } 2845 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2846 /* BSSID SA DA */ 2847 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2848 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2849 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2850 build.hdr_len = 24; 2851 break; 2852 case NL80211_IFTYPE_AP_VLAN: 2853 if (sdata->wdev.use_4addr) { 2854 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2855 IEEE80211_FCTL_TODS); 2856 /* RA TA DA SA */ 2857 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2858 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2859 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2860 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2861 build.hdr_len = 30; 2862 break; 2863 } 2864 /* fall through */ 2865 case NL80211_IFTYPE_AP: 2866 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2867 /* DA BSSID SA */ 2868 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2869 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2870 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2871 build.hdr_len = 24; 2872 break; 2873 default: 2874 /* not handled on fast-xmit */ 2875 goto out; 2876 } 2877 2878 if (sta->sta.wme) { 2879 build.hdr_len += 2; 2880 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2881 } 2882 2883 /* We store the key here so there's no point in using rcu_dereference() 2884 * but that's fine because the code that changes the pointers will call 2885 * this function after doing so. For a single CPU that would be enough, 2886 * for multiple see the comment above. 2887 */ 2888 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2889 if (!build.key) 2890 build.key = rcu_access_pointer(sdata->default_unicast_key); 2891 if (build.key) { 2892 bool gen_iv, iv_spc, mmic; 2893 2894 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2895 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2896 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2897 2898 /* don't handle software crypto */ 2899 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2900 goto out; 2901 2902 switch (build.key->conf.cipher) { 2903 case WLAN_CIPHER_SUITE_CCMP: 2904 case WLAN_CIPHER_SUITE_CCMP_256: 2905 /* add fixed key ID */ 2906 if (gen_iv) { 2907 (build.hdr + build.hdr_len)[3] = 2908 0x20 | (build.key->conf.keyidx << 6); 2909 build.pn_offs = build.hdr_len; 2910 } 2911 if (gen_iv || iv_spc) 2912 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2913 break; 2914 case WLAN_CIPHER_SUITE_GCMP: 2915 case WLAN_CIPHER_SUITE_GCMP_256: 2916 /* add fixed key ID */ 2917 if (gen_iv) { 2918 (build.hdr + build.hdr_len)[3] = 2919 0x20 | (build.key->conf.keyidx << 6); 2920 build.pn_offs = build.hdr_len; 2921 } 2922 if (gen_iv || iv_spc) 2923 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2924 break; 2925 case WLAN_CIPHER_SUITE_TKIP: 2926 /* cannot handle MMIC or IV generation in xmit-fast */ 2927 if (mmic || gen_iv) 2928 goto out; 2929 if (iv_spc) 2930 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2931 break; 2932 case WLAN_CIPHER_SUITE_WEP40: 2933 case WLAN_CIPHER_SUITE_WEP104: 2934 /* cannot handle IV generation in fast-xmit */ 2935 if (gen_iv) 2936 goto out; 2937 if (iv_spc) 2938 build.hdr_len += IEEE80211_WEP_IV_LEN; 2939 break; 2940 case WLAN_CIPHER_SUITE_AES_CMAC: 2941 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2942 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2943 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2944 WARN(1, 2945 "management cipher suite 0x%x enabled for data\n", 2946 build.key->conf.cipher); 2947 goto out; 2948 default: 2949 /* we don't know how to generate IVs for this at all */ 2950 if (WARN_ON(gen_iv)) 2951 goto out; 2952 /* pure hardware keys are OK, of course */ 2953 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2954 break; 2955 /* cipher scheme might require space allocation */ 2956 if (iv_spc && 2957 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2958 goto out; 2959 if (iv_spc) 2960 build.hdr_len += build.key->conf.iv_len; 2961 } 2962 2963 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2964 } 2965 2966 hdr->frame_control = fc; 2967 2968 memcpy(build.hdr + build.hdr_len, 2969 rfc1042_header, sizeof(rfc1042_header)); 2970 build.hdr_len += sizeof(rfc1042_header); 2971 2972 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2973 /* if the kmemdup fails, continue w/o fast_tx */ 2974 if (!fast_tx) 2975 goto out; 2976 2977 out: 2978 /* we might have raced against another call to this function */ 2979 old = rcu_dereference_protected(sta->fast_tx, 2980 lockdep_is_held(&sta->lock)); 2981 rcu_assign_pointer(sta->fast_tx, fast_tx); 2982 if (old) 2983 kfree_rcu(old, rcu_head); 2984 spin_unlock_bh(&sta->lock); 2985 } 2986 2987 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2988 { 2989 struct sta_info *sta; 2990 2991 rcu_read_lock(); 2992 list_for_each_entry_rcu(sta, &local->sta_list, list) 2993 ieee80211_check_fast_xmit(sta); 2994 rcu_read_unlock(); 2995 } 2996 2997 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2998 { 2999 struct ieee80211_local *local = sdata->local; 3000 struct sta_info *sta; 3001 3002 rcu_read_lock(); 3003 3004 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3005 if (sdata != sta->sdata && 3006 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3007 continue; 3008 ieee80211_check_fast_xmit(sta); 3009 } 3010 3011 rcu_read_unlock(); 3012 } 3013 3014 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3015 { 3016 struct ieee80211_fast_tx *fast_tx; 3017 3018 spin_lock_bh(&sta->lock); 3019 fast_tx = rcu_dereference_protected(sta->fast_tx, 3020 lockdep_is_held(&sta->lock)); 3021 RCU_INIT_POINTER(sta->fast_tx, NULL); 3022 spin_unlock_bh(&sta->lock); 3023 3024 if (fast_tx) 3025 kfree_rcu(fast_tx, rcu_head); 3026 } 3027 3028 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3029 struct sk_buff *skb, int headroom, 3030 int *subframe_len) 3031 { 3032 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3033 int padding = (4 - amsdu_len) & 3; 3034 3035 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3036 I802_DEBUG_INC(local->tx_expand_skb_head); 3037 3038 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3039 wiphy_debug(local->hw.wiphy, 3040 "failed to reallocate TX buffer\n"); 3041 return false; 3042 } 3043 } 3044 3045 if (padding) { 3046 *subframe_len += padding; 3047 skb_put_zero(skb, padding); 3048 } 3049 3050 return true; 3051 } 3052 3053 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3054 struct ieee80211_fast_tx *fast_tx, 3055 struct sk_buff *skb) 3056 { 3057 struct ieee80211_local *local = sdata->local; 3058 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3059 struct ieee80211_hdr *hdr; 3060 struct ethhdr *amsdu_hdr; 3061 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3062 int subframe_len = skb->len - hdr_len; 3063 void *data; 3064 u8 *qc, *h_80211_src, *h_80211_dst; 3065 const u8 *bssid; 3066 3067 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3068 return false; 3069 3070 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3071 return true; 3072 3073 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3074 &subframe_len)) 3075 return false; 3076 3077 data = skb_push(skb, sizeof(*amsdu_hdr)); 3078 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3079 hdr = data; 3080 amsdu_hdr = data + hdr_len; 3081 /* h_80211_src/dst is addr* field within hdr */ 3082 h_80211_src = data + fast_tx->sa_offs; 3083 h_80211_dst = data + fast_tx->da_offs; 3084 3085 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3086 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3087 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3088 3089 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3090 * fields needs to be changed to BSSID for A-MSDU frames depending 3091 * on FromDS/ToDS values. 3092 */ 3093 switch (sdata->vif.type) { 3094 case NL80211_IFTYPE_STATION: 3095 bssid = sdata->u.mgd.bssid; 3096 break; 3097 case NL80211_IFTYPE_AP: 3098 case NL80211_IFTYPE_AP_VLAN: 3099 bssid = sdata->vif.addr; 3100 break; 3101 default: 3102 bssid = NULL; 3103 } 3104 3105 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3106 ether_addr_copy(h_80211_src, bssid); 3107 3108 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3109 ether_addr_copy(h_80211_dst, bssid); 3110 3111 qc = ieee80211_get_qos_ctl(hdr); 3112 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3113 3114 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3115 3116 return true; 3117 } 3118 3119 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3120 struct sta_info *sta, 3121 struct ieee80211_fast_tx *fast_tx, 3122 struct sk_buff *skb) 3123 { 3124 struct ieee80211_local *local = sdata->local; 3125 struct fq *fq = &local->fq; 3126 struct fq_tin *tin; 3127 struct fq_flow *flow; 3128 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3129 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3130 struct txq_info *txqi; 3131 struct sk_buff **frag_tail, *head; 3132 int subframe_len = skb->len - ETH_ALEN; 3133 u8 max_subframes = sta->sta.max_amsdu_subframes; 3134 int max_frags = local->hw.max_tx_fragments; 3135 int max_amsdu_len = sta->sta.max_amsdu_len; 3136 __be16 len; 3137 void *data; 3138 bool ret = false; 3139 unsigned int orig_len; 3140 int n = 1, nfrags; 3141 3142 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3143 return false; 3144 3145 if (!txq) 3146 return false; 3147 3148 txqi = to_txq_info(txq); 3149 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3150 return false; 3151 3152 if (sta->sta.max_rc_amsdu_len) 3153 max_amsdu_len = min_t(int, max_amsdu_len, 3154 sta->sta.max_rc_amsdu_len); 3155 3156 spin_lock_bh(&fq->lock); 3157 3158 /* TODO: Ideally aggregation should be done on dequeue to remain 3159 * responsive to environment changes. 3160 */ 3161 3162 tin = &txqi->tin; 3163 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3164 head = skb_peek_tail(&flow->queue); 3165 if (!head) 3166 goto out; 3167 3168 orig_len = head->len; 3169 3170 if (skb->len + head->len > max_amsdu_len) 3171 goto out; 3172 3173 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3174 goto out; 3175 3176 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3177 nfrags += 1 + skb_shinfo(head)->nr_frags; 3178 frag_tail = &skb_shinfo(head)->frag_list; 3179 while (*frag_tail) { 3180 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3181 frag_tail = &(*frag_tail)->next; 3182 n++; 3183 } 3184 3185 if (max_subframes && n > max_subframes) 3186 goto out; 3187 3188 if (max_frags && nfrags > max_frags) 3189 goto out; 3190 3191 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3192 &subframe_len)) 3193 goto out; 3194 3195 ret = true; 3196 data = skb_push(skb, ETH_ALEN + 2); 3197 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3198 3199 data += 2 * ETH_ALEN; 3200 len = cpu_to_be16(subframe_len); 3201 memcpy(data, &len, 2); 3202 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3203 3204 head->len += skb->len; 3205 head->data_len += skb->len; 3206 *frag_tail = skb; 3207 3208 flow->backlog += head->len - orig_len; 3209 tin->backlog_bytes += head->len - orig_len; 3210 3211 fq_recalc_backlog(fq, tin, flow); 3212 3213 out: 3214 spin_unlock_bh(&fq->lock); 3215 3216 return ret; 3217 } 3218 3219 /* 3220 * Can be called while the sta lock is held. Anything that can cause packets to 3221 * be generated will cause deadlock! 3222 */ 3223 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3224 struct sta_info *sta, u8 pn_offs, 3225 struct ieee80211_key *key, 3226 struct sk_buff *skb) 3227 { 3228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3229 struct ieee80211_hdr *hdr = (void *)skb->data; 3230 u8 tid = IEEE80211_NUM_TIDS; 3231 3232 if (key) 3233 info->control.hw_key = &key->conf; 3234 3235 ieee80211_tx_stats(skb->dev, skb->len); 3236 3237 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3238 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3239 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3240 } else { 3241 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3242 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3243 sdata->sequence_number += 0x10; 3244 } 3245 3246 if (skb_shinfo(skb)->gso_size) 3247 sta->tx_stats.msdu[tid] += 3248 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3249 else 3250 sta->tx_stats.msdu[tid]++; 3251 3252 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3253 3254 /* statistics normally done by ieee80211_tx_h_stats (but that 3255 * has to consider fragmentation, so is more complex) 3256 */ 3257 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3258 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3259 3260 if (pn_offs) { 3261 u64 pn; 3262 u8 *crypto_hdr = skb->data + pn_offs; 3263 3264 switch (key->conf.cipher) { 3265 case WLAN_CIPHER_SUITE_CCMP: 3266 case WLAN_CIPHER_SUITE_CCMP_256: 3267 case WLAN_CIPHER_SUITE_GCMP: 3268 case WLAN_CIPHER_SUITE_GCMP_256: 3269 pn = atomic64_inc_return(&key->conf.tx_pn); 3270 crypto_hdr[0] = pn; 3271 crypto_hdr[1] = pn >> 8; 3272 crypto_hdr[4] = pn >> 16; 3273 crypto_hdr[5] = pn >> 24; 3274 crypto_hdr[6] = pn >> 32; 3275 crypto_hdr[7] = pn >> 40; 3276 break; 3277 } 3278 } 3279 } 3280 3281 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3282 struct sta_info *sta, 3283 struct ieee80211_fast_tx *fast_tx, 3284 struct sk_buff *skb) 3285 { 3286 struct ieee80211_local *local = sdata->local; 3287 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3288 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3289 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3290 struct ethhdr eth; 3291 struct ieee80211_tx_info *info; 3292 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3293 struct ieee80211_tx_data tx; 3294 ieee80211_tx_result r; 3295 struct tid_ampdu_tx *tid_tx = NULL; 3296 u8 tid = IEEE80211_NUM_TIDS; 3297 3298 /* control port protocol needs a lot of special handling */ 3299 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3300 return false; 3301 3302 /* only RFC 1042 SNAP */ 3303 if (ethertype < ETH_P_802_3_MIN) 3304 return false; 3305 3306 /* don't handle TX status request here either */ 3307 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3308 return false; 3309 3310 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3311 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3312 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3313 if (tid_tx) { 3314 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3315 return false; 3316 if (tid_tx->timeout) 3317 tid_tx->last_tx = jiffies; 3318 } 3319 } 3320 3321 /* after this point (skb is modified) we cannot return false */ 3322 3323 if (skb_shared(skb)) { 3324 struct sk_buff *tmp_skb = skb; 3325 3326 skb = skb_clone(skb, GFP_ATOMIC); 3327 kfree_skb(tmp_skb); 3328 3329 if (!skb) 3330 return true; 3331 } 3332 3333 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3334 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3335 return true; 3336 3337 /* will not be crypto-handled beyond what we do here, so use false 3338 * as the may-encrypt argument for the resize to not account for 3339 * more room than we already have in 'extra_head' 3340 */ 3341 if (unlikely(ieee80211_skb_resize(sdata, skb, 3342 max_t(int, extra_head + hw_headroom - 3343 skb_headroom(skb), 0), 3344 false))) { 3345 kfree_skb(skb); 3346 return true; 3347 } 3348 3349 memcpy(ð, skb->data, ETH_HLEN - 2); 3350 hdr = skb_push(skb, extra_head); 3351 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3352 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3353 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3354 3355 info = IEEE80211_SKB_CB(skb); 3356 memset(info, 0, sizeof(*info)); 3357 info->band = fast_tx->band; 3358 info->control.vif = &sdata->vif; 3359 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3360 IEEE80211_TX_CTL_DONTFRAG | 3361 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3362 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3363 3364 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3365 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3366 *ieee80211_get_qos_ctl(hdr) = tid; 3367 } 3368 3369 __skb_queue_head_init(&tx.skbs); 3370 3371 tx.flags = IEEE80211_TX_UNICAST; 3372 tx.local = local; 3373 tx.sdata = sdata; 3374 tx.sta = sta; 3375 tx.key = fast_tx->key; 3376 3377 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3378 tx.skb = skb; 3379 r = ieee80211_tx_h_rate_ctrl(&tx); 3380 skb = tx.skb; 3381 tx.skb = NULL; 3382 3383 if (r != TX_CONTINUE) { 3384 if (r != TX_QUEUED) 3385 kfree_skb(skb); 3386 return true; 3387 } 3388 } 3389 3390 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3391 return true; 3392 3393 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3394 fast_tx->key, skb); 3395 3396 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3397 sdata = container_of(sdata->bss, 3398 struct ieee80211_sub_if_data, u.ap); 3399 3400 __skb_queue_tail(&tx.skbs, skb); 3401 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3402 return true; 3403 } 3404 3405 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3406 struct ieee80211_txq *txq) 3407 { 3408 struct ieee80211_local *local = hw_to_local(hw); 3409 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3410 struct ieee80211_hdr *hdr; 3411 struct sk_buff *skb = NULL; 3412 struct fq *fq = &local->fq; 3413 struct fq_tin *tin = &txqi->tin; 3414 struct ieee80211_tx_info *info; 3415 struct ieee80211_tx_data tx; 3416 ieee80211_tx_result r; 3417 3418 spin_lock_bh(&fq->lock); 3419 3420 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3421 goto out; 3422 3423 /* Make sure fragments stay together. */ 3424 skb = __skb_dequeue(&txqi->frags); 3425 if (skb) 3426 goto out; 3427 3428 begin: 3429 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3430 if (!skb) 3431 goto out; 3432 3433 ieee80211_set_skb_vif(skb, txqi); 3434 3435 hdr = (struct ieee80211_hdr *)skb->data; 3436 info = IEEE80211_SKB_CB(skb); 3437 3438 memset(&tx, 0, sizeof(tx)); 3439 __skb_queue_head_init(&tx.skbs); 3440 tx.local = local; 3441 tx.skb = skb; 3442 tx.sdata = vif_to_sdata(info->control.vif); 3443 3444 if (txq->sta) 3445 tx.sta = container_of(txq->sta, struct sta_info, sta); 3446 3447 /* 3448 * The key can be removed while the packet was queued, so need to call 3449 * this here to get the current key. 3450 */ 3451 r = ieee80211_tx_h_select_key(&tx); 3452 if (r != TX_CONTINUE) { 3453 ieee80211_free_txskb(&local->hw, skb); 3454 goto begin; 3455 } 3456 3457 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3458 info->flags |= IEEE80211_TX_CTL_AMPDU; 3459 else 3460 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3461 3462 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3463 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3464 sta); 3465 u8 pn_offs = 0; 3466 3467 if (tx.key && 3468 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3469 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3470 3471 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3472 tx.key, skb); 3473 } else { 3474 if (invoke_tx_handlers_late(&tx)) 3475 goto begin; 3476 3477 skb = __skb_dequeue(&tx.skbs); 3478 3479 if (!skb_queue_empty(&tx.skbs)) 3480 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3481 } 3482 3483 if (skb && skb_has_frag_list(skb) && 3484 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3485 if (skb_linearize(skb)) { 3486 ieee80211_free_txskb(&local->hw, skb); 3487 goto begin; 3488 } 3489 } 3490 3491 out: 3492 spin_unlock_bh(&fq->lock); 3493 3494 return skb; 3495 } 3496 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3497 3498 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3499 struct net_device *dev, 3500 u32 info_flags) 3501 { 3502 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3503 struct sta_info *sta; 3504 struct sk_buff *next; 3505 3506 if (unlikely(skb->len < ETH_HLEN)) { 3507 kfree_skb(skb); 3508 return; 3509 } 3510 3511 rcu_read_lock(); 3512 3513 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3514 goto out_free; 3515 3516 if (!IS_ERR_OR_NULL(sta)) { 3517 struct ieee80211_fast_tx *fast_tx; 3518 3519 fast_tx = rcu_dereference(sta->fast_tx); 3520 3521 if (fast_tx && 3522 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3523 goto out; 3524 } 3525 3526 if (skb_is_gso(skb)) { 3527 struct sk_buff *segs; 3528 3529 segs = skb_gso_segment(skb, 0); 3530 if (IS_ERR(segs)) { 3531 goto out_free; 3532 } else if (segs) { 3533 consume_skb(skb); 3534 skb = segs; 3535 } 3536 } else { 3537 /* we cannot process non-linear frames on this path */ 3538 if (skb_linearize(skb)) { 3539 kfree_skb(skb); 3540 goto out; 3541 } 3542 3543 /* the frame could be fragmented, software-encrypted, and other 3544 * things so we cannot really handle checksum offload with it - 3545 * fix it up in software before we handle anything else. 3546 */ 3547 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3548 skb_set_transport_header(skb, 3549 skb_checksum_start_offset(skb)); 3550 if (skb_checksum_help(skb)) 3551 goto out_free; 3552 } 3553 } 3554 3555 next = skb; 3556 while (next) { 3557 skb = next; 3558 next = skb->next; 3559 3560 skb->prev = NULL; 3561 skb->next = NULL; 3562 3563 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3564 if (IS_ERR(skb)) 3565 goto out; 3566 3567 ieee80211_tx_stats(dev, skb->len); 3568 3569 ieee80211_xmit(sdata, sta, skb); 3570 } 3571 goto out; 3572 out_free: 3573 kfree_skb(skb); 3574 out: 3575 rcu_read_unlock(); 3576 } 3577 3578 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3579 { 3580 struct ethhdr *eth; 3581 int err; 3582 3583 err = skb_ensure_writable(skb, ETH_HLEN); 3584 if (unlikely(err)) 3585 return err; 3586 3587 eth = (void *)skb->data; 3588 ether_addr_copy(eth->h_dest, sta->sta.addr); 3589 3590 return 0; 3591 } 3592 3593 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3594 struct net_device *dev) 3595 { 3596 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3597 const struct ethhdr *eth = (void *)skb->data; 3598 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3599 __be16 ethertype; 3600 3601 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3602 return false; 3603 3604 switch (sdata->vif.type) { 3605 case NL80211_IFTYPE_AP_VLAN: 3606 if (sdata->u.vlan.sta) 3607 return false; 3608 if (sdata->wdev.use_4addr) 3609 return false; 3610 /* fall through */ 3611 case NL80211_IFTYPE_AP: 3612 /* check runtime toggle for this bss */ 3613 if (!sdata->bss->multicast_to_unicast) 3614 return false; 3615 break; 3616 default: 3617 return false; 3618 } 3619 3620 /* multicast to unicast conversion only for some payload */ 3621 ethertype = eth->h_proto; 3622 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3623 ethertype = ethvlan->h_vlan_encapsulated_proto; 3624 switch (ethertype) { 3625 case htons(ETH_P_ARP): 3626 case htons(ETH_P_IP): 3627 case htons(ETH_P_IPV6): 3628 break; 3629 default: 3630 return false; 3631 } 3632 3633 return true; 3634 } 3635 3636 static void 3637 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3638 struct sk_buff_head *queue) 3639 { 3640 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3641 struct ieee80211_local *local = sdata->local; 3642 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3643 struct sta_info *sta, *first = NULL; 3644 struct sk_buff *cloned_skb; 3645 3646 rcu_read_lock(); 3647 3648 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3649 if (sdata != sta->sdata) 3650 /* AP-VLAN mismatch */ 3651 continue; 3652 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3653 /* do not send back to source */ 3654 continue; 3655 if (!first) { 3656 first = sta; 3657 continue; 3658 } 3659 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3660 if (!cloned_skb) 3661 goto multicast; 3662 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3663 dev_kfree_skb(cloned_skb); 3664 goto multicast; 3665 } 3666 __skb_queue_tail(queue, cloned_skb); 3667 } 3668 3669 if (likely(first)) { 3670 if (unlikely(ieee80211_change_da(skb, first))) 3671 goto multicast; 3672 __skb_queue_tail(queue, skb); 3673 } else { 3674 /* no STA connected, drop */ 3675 kfree_skb(skb); 3676 skb = NULL; 3677 } 3678 3679 goto out; 3680 multicast: 3681 __skb_queue_purge(queue); 3682 __skb_queue_tail(queue, skb); 3683 out: 3684 rcu_read_unlock(); 3685 } 3686 3687 /** 3688 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3689 * @skb: packet to be sent 3690 * @dev: incoming interface 3691 * 3692 * On failure skb will be freed. 3693 */ 3694 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3695 struct net_device *dev) 3696 { 3697 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3698 struct sk_buff_head queue; 3699 3700 __skb_queue_head_init(&queue); 3701 ieee80211_convert_to_unicast(skb, dev, &queue); 3702 while ((skb = __skb_dequeue(&queue))) 3703 __ieee80211_subif_start_xmit(skb, dev, 0); 3704 } else { 3705 __ieee80211_subif_start_xmit(skb, dev, 0); 3706 } 3707 3708 return NETDEV_TX_OK; 3709 } 3710 3711 struct sk_buff * 3712 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3713 struct sk_buff *skb, u32 info_flags) 3714 { 3715 struct ieee80211_hdr *hdr; 3716 struct ieee80211_tx_data tx = { 3717 .local = sdata->local, 3718 .sdata = sdata, 3719 }; 3720 struct sta_info *sta; 3721 3722 rcu_read_lock(); 3723 3724 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3725 kfree_skb(skb); 3726 skb = ERR_PTR(-EINVAL); 3727 goto out; 3728 } 3729 3730 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3731 if (IS_ERR(skb)) 3732 goto out; 3733 3734 hdr = (void *)skb->data; 3735 tx.sta = sta_info_get(sdata, hdr->addr1); 3736 tx.skb = skb; 3737 3738 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3739 rcu_read_unlock(); 3740 kfree_skb(skb); 3741 return ERR_PTR(-EINVAL); 3742 } 3743 3744 out: 3745 rcu_read_unlock(); 3746 return skb; 3747 } 3748 3749 /* 3750 * ieee80211_clear_tx_pending may not be called in a context where 3751 * it is possible that it packets could come in again. 3752 */ 3753 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3754 { 3755 struct sk_buff *skb; 3756 int i; 3757 3758 for (i = 0; i < local->hw.queues; i++) { 3759 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3760 ieee80211_free_txskb(&local->hw, skb); 3761 } 3762 } 3763 3764 /* 3765 * Returns false if the frame couldn't be transmitted but was queued instead, 3766 * which in this case means re-queued -- take as an indication to stop sending 3767 * more pending frames. 3768 */ 3769 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3770 struct sk_buff *skb) 3771 { 3772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3773 struct ieee80211_sub_if_data *sdata; 3774 struct sta_info *sta; 3775 struct ieee80211_hdr *hdr; 3776 bool result; 3777 struct ieee80211_chanctx_conf *chanctx_conf; 3778 3779 sdata = vif_to_sdata(info->control.vif); 3780 3781 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3782 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3783 if (unlikely(!chanctx_conf)) { 3784 dev_kfree_skb(skb); 3785 return true; 3786 } 3787 info->band = chanctx_conf->def.chan->band; 3788 result = ieee80211_tx(sdata, NULL, skb, true); 3789 } else { 3790 struct sk_buff_head skbs; 3791 3792 __skb_queue_head_init(&skbs); 3793 __skb_queue_tail(&skbs, skb); 3794 3795 hdr = (struct ieee80211_hdr *)skb->data; 3796 sta = sta_info_get(sdata, hdr->addr1); 3797 3798 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3799 } 3800 3801 return result; 3802 } 3803 3804 /* 3805 * Transmit all pending packets. Called from tasklet. 3806 */ 3807 void ieee80211_tx_pending(unsigned long data) 3808 { 3809 struct ieee80211_local *local = (struct ieee80211_local *)data; 3810 unsigned long flags; 3811 int i; 3812 bool txok; 3813 3814 rcu_read_lock(); 3815 3816 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3817 for (i = 0; i < local->hw.queues; i++) { 3818 /* 3819 * If queue is stopped by something other than due to pending 3820 * frames, or we have no pending frames, proceed to next queue. 3821 */ 3822 if (local->queue_stop_reasons[i] || 3823 skb_queue_empty(&local->pending[i])) 3824 continue; 3825 3826 while (!skb_queue_empty(&local->pending[i])) { 3827 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3829 3830 if (WARN_ON(!info->control.vif)) { 3831 ieee80211_free_txskb(&local->hw, skb); 3832 continue; 3833 } 3834 3835 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3836 flags); 3837 3838 txok = ieee80211_tx_pending_skb(local, skb); 3839 spin_lock_irqsave(&local->queue_stop_reason_lock, 3840 flags); 3841 if (!txok) 3842 break; 3843 } 3844 3845 if (skb_queue_empty(&local->pending[i])) 3846 ieee80211_propagate_queue_wake(local, i); 3847 } 3848 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3849 3850 rcu_read_unlock(); 3851 } 3852 3853 /* functions for drivers to get certain frames */ 3854 3855 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3856 struct ps_data *ps, struct sk_buff *skb, 3857 bool is_template) 3858 { 3859 u8 *pos, *tim; 3860 int aid0 = 0; 3861 int i, have_bits = 0, n1, n2; 3862 3863 /* Generate bitmap for TIM only if there are any STAs in power save 3864 * mode. */ 3865 if (atomic_read(&ps->num_sta_ps) > 0) 3866 /* in the hope that this is faster than 3867 * checking byte-for-byte */ 3868 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3869 IEEE80211_MAX_AID+1); 3870 if (!is_template) { 3871 if (ps->dtim_count == 0) 3872 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3873 else 3874 ps->dtim_count--; 3875 } 3876 3877 tim = pos = skb_put(skb, 6); 3878 *pos++ = WLAN_EID_TIM; 3879 *pos++ = 4; 3880 *pos++ = ps->dtim_count; 3881 *pos++ = sdata->vif.bss_conf.dtim_period; 3882 3883 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3884 aid0 = 1; 3885 3886 ps->dtim_bc_mc = aid0 == 1; 3887 3888 if (have_bits) { 3889 /* Find largest even number N1 so that bits numbered 1 through 3890 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3891 * (N2 + 1) x 8 through 2007 are 0. */ 3892 n1 = 0; 3893 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3894 if (ps->tim[i]) { 3895 n1 = i & 0xfe; 3896 break; 3897 } 3898 } 3899 n2 = n1; 3900 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3901 if (ps->tim[i]) { 3902 n2 = i; 3903 break; 3904 } 3905 } 3906 3907 /* Bitmap control */ 3908 *pos++ = n1 | aid0; 3909 /* Part Virt Bitmap */ 3910 skb_put(skb, n2 - n1); 3911 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3912 3913 tim[1] = n2 - n1 + 4; 3914 } else { 3915 *pos++ = aid0; /* Bitmap control */ 3916 *pos++ = 0; /* Part Virt Bitmap */ 3917 } 3918 } 3919 3920 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3921 struct ps_data *ps, struct sk_buff *skb, 3922 bool is_template) 3923 { 3924 struct ieee80211_local *local = sdata->local; 3925 3926 /* 3927 * Not very nice, but we want to allow the driver to call 3928 * ieee80211_beacon_get() as a response to the set_tim() 3929 * callback. That, however, is already invoked under the 3930 * sta_lock to guarantee consistent and race-free update 3931 * of the tim bitmap in mac80211 and the driver. 3932 */ 3933 if (local->tim_in_locked_section) { 3934 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3935 } else { 3936 spin_lock_bh(&local->tim_lock); 3937 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3938 spin_unlock_bh(&local->tim_lock); 3939 } 3940 3941 return 0; 3942 } 3943 3944 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3945 struct beacon_data *beacon) 3946 { 3947 struct probe_resp *resp; 3948 u8 *beacon_data; 3949 size_t beacon_data_len; 3950 int i; 3951 u8 count = beacon->csa_current_counter; 3952 3953 switch (sdata->vif.type) { 3954 case NL80211_IFTYPE_AP: 3955 beacon_data = beacon->tail; 3956 beacon_data_len = beacon->tail_len; 3957 break; 3958 case NL80211_IFTYPE_ADHOC: 3959 beacon_data = beacon->head; 3960 beacon_data_len = beacon->head_len; 3961 break; 3962 case NL80211_IFTYPE_MESH_POINT: 3963 beacon_data = beacon->head; 3964 beacon_data_len = beacon->head_len; 3965 break; 3966 default: 3967 return; 3968 } 3969 3970 rcu_read_lock(); 3971 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3972 resp = rcu_dereference(sdata->u.ap.probe_resp); 3973 3974 if (beacon->csa_counter_offsets[i]) { 3975 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3976 beacon_data_len)) { 3977 rcu_read_unlock(); 3978 return; 3979 } 3980 3981 beacon_data[beacon->csa_counter_offsets[i]] = count; 3982 } 3983 3984 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3985 resp->data[resp->csa_counter_offsets[i]] = count; 3986 } 3987 rcu_read_unlock(); 3988 } 3989 3990 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3991 { 3992 beacon->csa_current_counter--; 3993 3994 /* the counter should never reach 0 */ 3995 WARN_ON_ONCE(!beacon->csa_current_counter); 3996 3997 return beacon->csa_current_counter; 3998 } 3999 4000 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4001 { 4002 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4003 struct beacon_data *beacon = NULL; 4004 u8 count = 0; 4005 4006 rcu_read_lock(); 4007 4008 if (sdata->vif.type == NL80211_IFTYPE_AP) 4009 beacon = rcu_dereference(sdata->u.ap.beacon); 4010 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4011 beacon = rcu_dereference(sdata->u.ibss.presp); 4012 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4013 beacon = rcu_dereference(sdata->u.mesh.beacon); 4014 4015 if (!beacon) 4016 goto unlock; 4017 4018 count = __ieee80211_csa_update_counter(beacon); 4019 4020 unlock: 4021 rcu_read_unlock(); 4022 return count; 4023 } 4024 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4025 4026 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4027 { 4028 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4029 struct beacon_data *beacon = NULL; 4030 u8 *beacon_data; 4031 size_t beacon_data_len; 4032 int ret = false; 4033 4034 if (!ieee80211_sdata_running(sdata)) 4035 return false; 4036 4037 rcu_read_lock(); 4038 if (vif->type == NL80211_IFTYPE_AP) { 4039 struct ieee80211_if_ap *ap = &sdata->u.ap; 4040 4041 beacon = rcu_dereference(ap->beacon); 4042 if (WARN_ON(!beacon || !beacon->tail)) 4043 goto out; 4044 beacon_data = beacon->tail; 4045 beacon_data_len = beacon->tail_len; 4046 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4047 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4048 4049 beacon = rcu_dereference(ifibss->presp); 4050 if (!beacon) 4051 goto out; 4052 4053 beacon_data = beacon->head; 4054 beacon_data_len = beacon->head_len; 4055 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4056 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4057 4058 beacon = rcu_dereference(ifmsh->beacon); 4059 if (!beacon) 4060 goto out; 4061 4062 beacon_data = beacon->head; 4063 beacon_data_len = beacon->head_len; 4064 } else { 4065 WARN_ON(1); 4066 goto out; 4067 } 4068 4069 if (!beacon->csa_counter_offsets[0]) 4070 goto out; 4071 4072 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4073 goto out; 4074 4075 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4076 ret = true; 4077 out: 4078 rcu_read_unlock(); 4079 4080 return ret; 4081 } 4082 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4083 4084 static struct sk_buff * 4085 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4086 struct ieee80211_vif *vif, 4087 struct ieee80211_mutable_offsets *offs, 4088 bool is_template) 4089 { 4090 struct ieee80211_local *local = hw_to_local(hw); 4091 struct beacon_data *beacon = NULL; 4092 struct sk_buff *skb = NULL; 4093 struct ieee80211_tx_info *info; 4094 struct ieee80211_sub_if_data *sdata = NULL; 4095 enum nl80211_band band; 4096 struct ieee80211_tx_rate_control txrc; 4097 struct ieee80211_chanctx_conf *chanctx_conf; 4098 int csa_off_base = 0; 4099 4100 rcu_read_lock(); 4101 4102 sdata = vif_to_sdata(vif); 4103 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4104 4105 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4106 goto out; 4107 4108 if (offs) 4109 memset(offs, 0, sizeof(*offs)); 4110 4111 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4112 struct ieee80211_if_ap *ap = &sdata->u.ap; 4113 4114 beacon = rcu_dereference(ap->beacon); 4115 if (beacon) { 4116 if (beacon->csa_counter_offsets[0]) { 4117 if (!is_template) 4118 __ieee80211_csa_update_counter(beacon); 4119 4120 ieee80211_set_csa(sdata, beacon); 4121 } 4122 4123 /* 4124 * headroom, head length, 4125 * tail length and maximum TIM length 4126 */ 4127 skb = dev_alloc_skb(local->tx_headroom + 4128 beacon->head_len + 4129 beacon->tail_len + 256 + 4130 local->hw.extra_beacon_tailroom); 4131 if (!skb) 4132 goto out; 4133 4134 skb_reserve(skb, local->tx_headroom); 4135 skb_put_data(skb, beacon->head, beacon->head_len); 4136 4137 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4138 is_template); 4139 4140 if (offs) { 4141 offs->tim_offset = beacon->head_len; 4142 offs->tim_length = skb->len - beacon->head_len; 4143 4144 /* for AP the csa offsets are from tail */ 4145 csa_off_base = skb->len; 4146 } 4147 4148 if (beacon->tail) 4149 skb_put_data(skb, beacon->tail, 4150 beacon->tail_len); 4151 } else 4152 goto out; 4153 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4154 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4155 struct ieee80211_hdr *hdr; 4156 4157 beacon = rcu_dereference(ifibss->presp); 4158 if (!beacon) 4159 goto out; 4160 4161 if (beacon->csa_counter_offsets[0]) { 4162 if (!is_template) 4163 __ieee80211_csa_update_counter(beacon); 4164 4165 ieee80211_set_csa(sdata, beacon); 4166 } 4167 4168 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4169 local->hw.extra_beacon_tailroom); 4170 if (!skb) 4171 goto out; 4172 skb_reserve(skb, local->tx_headroom); 4173 skb_put_data(skb, beacon->head, beacon->head_len); 4174 4175 hdr = (struct ieee80211_hdr *) skb->data; 4176 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4177 IEEE80211_STYPE_BEACON); 4178 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4179 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4180 4181 beacon = rcu_dereference(ifmsh->beacon); 4182 if (!beacon) 4183 goto out; 4184 4185 if (beacon->csa_counter_offsets[0]) { 4186 if (!is_template) 4187 /* TODO: For mesh csa_counter is in TU, so 4188 * decrementing it by one isn't correct, but 4189 * for now we leave it consistent with overall 4190 * mac80211's behavior. 4191 */ 4192 __ieee80211_csa_update_counter(beacon); 4193 4194 ieee80211_set_csa(sdata, beacon); 4195 } 4196 4197 if (ifmsh->sync_ops) 4198 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4199 4200 skb = dev_alloc_skb(local->tx_headroom + 4201 beacon->head_len + 4202 256 + /* TIM IE */ 4203 beacon->tail_len + 4204 local->hw.extra_beacon_tailroom); 4205 if (!skb) 4206 goto out; 4207 skb_reserve(skb, local->tx_headroom); 4208 skb_put_data(skb, beacon->head, beacon->head_len); 4209 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4210 4211 if (offs) { 4212 offs->tim_offset = beacon->head_len; 4213 offs->tim_length = skb->len - beacon->head_len; 4214 } 4215 4216 skb_put_data(skb, beacon->tail, beacon->tail_len); 4217 } else { 4218 WARN_ON(1); 4219 goto out; 4220 } 4221 4222 /* CSA offsets */ 4223 if (offs && beacon) { 4224 int i; 4225 4226 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4227 u16 csa_off = beacon->csa_counter_offsets[i]; 4228 4229 if (!csa_off) 4230 continue; 4231 4232 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4233 } 4234 } 4235 4236 band = chanctx_conf->def.chan->band; 4237 4238 info = IEEE80211_SKB_CB(skb); 4239 4240 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4241 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4242 info->band = band; 4243 4244 memset(&txrc, 0, sizeof(txrc)); 4245 txrc.hw = hw; 4246 txrc.sband = local->hw.wiphy->bands[band]; 4247 txrc.bss_conf = &sdata->vif.bss_conf; 4248 txrc.skb = skb; 4249 txrc.reported_rate.idx = -1; 4250 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4251 txrc.bss = true; 4252 rate_control_get_rate(sdata, NULL, &txrc); 4253 4254 info->control.vif = vif; 4255 4256 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4257 IEEE80211_TX_CTL_ASSIGN_SEQ | 4258 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4259 out: 4260 rcu_read_unlock(); 4261 return skb; 4262 4263 } 4264 4265 struct sk_buff * 4266 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4267 struct ieee80211_vif *vif, 4268 struct ieee80211_mutable_offsets *offs) 4269 { 4270 return __ieee80211_beacon_get(hw, vif, offs, true); 4271 } 4272 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4273 4274 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4275 struct ieee80211_vif *vif, 4276 u16 *tim_offset, u16 *tim_length) 4277 { 4278 struct ieee80211_mutable_offsets offs = {}; 4279 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4280 struct sk_buff *copy; 4281 struct ieee80211_supported_band *sband; 4282 int shift; 4283 4284 if (!bcn) 4285 return bcn; 4286 4287 if (tim_offset) 4288 *tim_offset = offs.tim_offset; 4289 4290 if (tim_length) 4291 *tim_length = offs.tim_length; 4292 4293 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4294 !hw_to_local(hw)->monitors) 4295 return bcn; 4296 4297 /* send a copy to monitor interfaces */ 4298 copy = skb_copy(bcn, GFP_ATOMIC); 4299 if (!copy) 4300 return bcn; 4301 4302 shift = ieee80211_vif_get_shift(vif); 4303 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4304 if (!sband) 4305 return bcn; 4306 4307 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4308 4309 return bcn; 4310 } 4311 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4312 4313 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4314 struct ieee80211_vif *vif) 4315 { 4316 struct ieee80211_if_ap *ap = NULL; 4317 struct sk_buff *skb = NULL; 4318 struct probe_resp *presp = NULL; 4319 struct ieee80211_hdr *hdr; 4320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4321 4322 if (sdata->vif.type != NL80211_IFTYPE_AP) 4323 return NULL; 4324 4325 rcu_read_lock(); 4326 4327 ap = &sdata->u.ap; 4328 presp = rcu_dereference(ap->probe_resp); 4329 if (!presp) 4330 goto out; 4331 4332 skb = dev_alloc_skb(presp->len); 4333 if (!skb) 4334 goto out; 4335 4336 skb_put_data(skb, presp->data, presp->len); 4337 4338 hdr = (struct ieee80211_hdr *) skb->data; 4339 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4340 4341 out: 4342 rcu_read_unlock(); 4343 return skb; 4344 } 4345 EXPORT_SYMBOL(ieee80211_proberesp_get); 4346 4347 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4348 struct ieee80211_vif *vif) 4349 { 4350 struct ieee80211_sub_if_data *sdata; 4351 struct ieee80211_if_managed *ifmgd; 4352 struct ieee80211_pspoll *pspoll; 4353 struct ieee80211_local *local; 4354 struct sk_buff *skb; 4355 4356 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4357 return NULL; 4358 4359 sdata = vif_to_sdata(vif); 4360 ifmgd = &sdata->u.mgd; 4361 local = sdata->local; 4362 4363 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4364 if (!skb) 4365 return NULL; 4366 4367 skb_reserve(skb, local->hw.extra_tx_headroom); 4368 4369 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4370 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4371 IEEE80211_STYPE_PSPOLL); 4372 pspoll->aid = cpu_to_le16(ifmgd->aid); 4373 4374 /* aid in PS-Poll has its two MSBs each set to 1 */ 4375 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4376 4377 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4378 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4379 4380 return skb; 4381 } 4382 EXPORT_SYMBOL(ieee80211_pspoll_get); 4383 4384 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4385 struct ieee80211_vif *vif) 4386 { 4387 struct ieee80211_hdr_3addr *nullfunc; 4388 struct ieee80211_sub_if_data *sdata; 4389 struct ieee80211_if_managed *ifmgd; 4390 struct ieee80211_local *local; 4391 struct sk_buff *skb; 4392 4393 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4394 return NULL; 4395 4396 sdata = vif_to_sdata(vif); 4397 ifmgd = &sdata->u.mgd; 4398 local = sdata->local; 4399 4400 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4401 if (!skb) 4402 return NULL; 4403 4404 skb_reserve(skb, local->hw.extra_tx_headroom); 4405 4406 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4407 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4408 IEEE80211_STYPE_NULLFUNC | 4409 IEEE80211_FCTL_TODS); 4410 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4411 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4412 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4413 4414 return skb; 4415 } 4416 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4417 4418 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4419 const u8 *src_addr, 4420 const u8 *ssid, size_t ssid_len, 4421 size_t tailroom) 4422 { 4423 struct ieee80211_local *local = hw_to_local(hw); 4424 struct ieee80211_hdr_3addr *hdr; 4425 struct sk_buff *skb; 4426 size_t ie_ssid_len; 4427 u8 *pos; 4428 4429 ie_ssid_len = 2 + ssid_len; 4430 4431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4432 ie_ssid_len + tailroom); 4433 if (!skb) 4434 return NULL; 4435 4436 skb_reserve(skb, local->hw.extra_tx_headroom); 4437 4438 hdr = skb_put_zero(skb, sizeof(*hdr)); 4439 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4440 IEEE80211_STYPE_PROBE_REQ); 4441 eth_broadcast_addr(hdr->addr1); 4442 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4443 eth_broadcast_addr(hdr->addr3); 4444 4445 pos = skb_put(skb, ie_ssid_len); 4446 *pos++ = WLAN_EID_SSID; 4447 *pos++ = ssid_len; 4448 if (ssid_len) 4449 memcpy(pos, ssid, ssid_len); 4450 pos += ssid_len; 4451 4452 return skb; 4453 } 4454 EXPORT_SYMBOL(ieee80211_probereq_get); 4455 4456 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4457 const void *frame, size_t frame_len, 4458 const struct ieee80211_tx_info *frame_txctl, 4459 struct ieee80211_rts *rts) 4460 { 4461 const struct ieee80211_hdr *hdr = frame; 4462 4463 rts->frame_control = 4464 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4465 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4466 frame_txctl); 4467 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4468 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4469 } 4470 EXPORT_SYMBOL(ieee80211_rts_get); 4471 4472 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4473 const void *frame, size_t frame_len, 4474 const struct ieee80211_tx_info *frame_txctl, 4475 struct ieee80211_cts *cts) 4476 { 4477 const struct ieee80211_hdr *hdr = frame; 4478 4479 cts->frame_control = 4480 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4481 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4482 frame_len, frame_txctl); 4483 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4484 } 4485 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4486 4487 struct sk_buff * 4488 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4489 struct ieee80211_vif *vif) 4490 { 4491 struct ieee80211_local *local = hw_to_local(hw); 4492 struct sk_buff *skb = NULL; 4493 struct ieee80211_tx_data tx; 4494 struct ieee80211_sub_if_data *sdata; 4495 struct ps_data *ps; 4496 struct ieee80211_tx_info *info; 4497 struct ieee80211_chanctx_conf *chanctx_conf; 4498 4499 sdata = vif_to_sdata(vif); 4500 4501 rcu_read_lock(); 4502 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4503 4504 if (!chanctx_conf) 4505 goto out; 4506 4507 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4508 struct beacon_data *beacon = 4509 rcu_dereference(sdata->u.ap.beacon); 4510 4511 if (!beacon || !beacon->head) 4512 goto out; 4513 4514 ps = &sdata->u.ap.ps; 4515 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4516 ps = &sdata->u.mesh.ps; 4517 } else { 4518 goto out; 4519 } 4520 4521 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4522 goto out; /* send buffered bc/mc only after DTIM beacon */ 4523 4524 while (1) { 4525 skb = skb_dequeue(&ps->bc_buf); 4526 if (!skb) 4527 goto out; 4528 local->total_ps_buffered--; 4529 4530 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4531 struct ieee80211_hdr *hdr = 4532 (struct ieee80211_hdr *) skb->data; 4533 /* more buffered multicast/broadcast frames ==> set 4534 * MoreData flag in IEEE 802.11 header to inform PS 4535 * STAs */ 4536 hdr->frame_control |= 4537 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4538 } 4539 4540 if (sdata->vif.type == NL80211_IFTYPE_AP) 4541 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4542 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4543 break; 4544 ieee80211_free_txskb(hw, skb); 4545 } 4546 4547 info = IEEE80211_SKB_CB(skb); 4548 4549 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4550 info->band = chanctx_conf->def.chan->band; 4551 4552 if (invoke_tx_handlers(&tx)) 4553 skb = NULL; 4554 out: 4555 rcu_read_unlock(); 4556 4557 return skb; 4558 } 4559 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4560 4561 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4562 { 4563 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4564 struct ieee80211_sub_if_data *sdata = sta->sdata; 4565 struct ieee80211_local *local = sdata->local; 4566 int ret; 4567 u32 queues; 4568 4569 lockdep_assert_held(&local->sta_mtx); 4570 4571 /* only some cases are supported right now */ 4572 switch (sdata->vif.type) { 4573 case NL80211_IFTYPE_STATION: 4574 case NL80211_IFTYPE_AP: 4575 case NL80211_IFTYPE_AP_VLAN: 4576 break; 4577 default: 4578 WARN_ON(1); 4579 return -EINVAL; 4580 } 4581 4582 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4583 return -EINVAL; 4584 4585 if (sta->reserved_tid == tid) { 4586 ret = 0; 4587 goto out; 4588 } 4589 4590 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4591 sdata_err(sdata, "TID reservation already active\n"); 4592 ret = -EALREADY; 4593 goto out; 4594 } 4595 4596 ieee80211_stop_vif_queues(sdata->local, sdata, 4597 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4598 4599 synchronize_net(); 4600 4601 /* Tear down BA sessions so we stop aggregating on this TID */ 4602 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4603 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4604 __ieee80211_stop_tx_ba_session(sta, tid, 4605 AGG_STOP_LOCAL_REQUEST); 4606 } 4607 4608 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4609 __ieee80211_flush_queues(local, sdata, queues, false); 4610 4611 sta->reserved_tid = tid; 4612 4613 ieee80211_wake_vif_queues(local, sdata, 4614 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4615 4616 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4617 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4618 4619 ret = 0; 4620 out: 4621 return ret; 4622 } 4623 EXPORT_SYMBOL(ieee80211_reserve_tid); 4624 4625 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4626 { 4627 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4628 struct ieee80211_sub_if_data *sdata = sta->sdata; 4629 4630 lockdep_assert_held(&sdata->local->sta_mtx); 4631 4632 /* only some cases are supported right now */ 4633 switch (sdata->vif.type) { 4634 case NL80211_IFTYPE_STATION: 4635 case NL80211_IFTYPE_AP: 4636 case NL80211_IFTYPE_AP_VLAN: 4637 break; 4638 default: 4639 WARN_ON(1); 4640 return; 4641 } 4642 4643 if (tid != sta->reserved_tid) { 4644 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4645 return; 4646 } 4647 4648 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4649 } 4650 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4651 4652 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4653 struct sk_buff *skb, int tid, 4654 enum nl80211_band band) 4655 { 4656 int ac = ieee80211_ac_from_tid(tid); 4657 4658 skb_reset_mac_header(skb); 4659 skb_set_queue_mapping(skb, ac); 4660 skb->priority = tid; 4661 4662 skb->dev = sdata->dev; 4663 4664 /* 4665 * The other path calling ieee80211_xmit is from the tasklet, 4666 * and while we can handle concurrent transmissions locking 4667 * requirements are that we do not come into tx with bhs on. 4668 */ 4669 local_bh_disable(); 4670 IEEE80211_SKB_CB(skb)->band = band; 4671 ieee80211_xmit(sdata, NULL, skb); 4672 local_bh_enable(); 4673 } 4674