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 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 907 memcpy(skb_put(tmp, fraglen), 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 cparams = &local->cparams; 1344 cstats = &txqi->cstats; 1345 1346 if (flow == &txqi->def_flow) 1347 cvars = &txqi->def_cvars; 1348 else 1349 cvars = &local->cvars[flow - fq->flows]; 1350 1351 return codel_dequeue(txqi, 1352 &flow->backlog, 1353 cparams, 1354 cvars, 1355 cstats, 1356 codel_skb_len_func, 1357 codel_skb_time_func, 1358 codel_drop_func, 1359 codel_dequeue_func); 1360 } 1361 1362 static void fq_skb_free_func(struct fq *fq, 1363 struct fq_tin *tin, 1364 struct fq_flow *flow, 1365 struct sk_buff *skb) 1366 { 1367 struct ieee80211_local *local; 1368 1369 local = container_of(fq, struct ieee80211_local, fq); 1370 ieee80211_free_txskb(&local->hw, skb); 1371 } 1372 1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1374 struct fq_tin *tin, 1375 int idx, 1376 struct sk_buff *skb) 1377 { 1378 struct txq_info *txqi; 1379 1380 txqi = container_of(tin, struct txq_info, tin); 1381 return &txqi->def_flow; 1382 } 1383 1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1385 struct txq_info *txqi, 1386 struct sk_buff *skb) 1387 { 1388 struct fq *fq = &local->fq; 1389 struct fq_tin *tin = &txqi->tin; 1390 1391 ieee80211_set_skb_enqueue_time(skb); 1392 fq_tin_enqueue(fq, tin, skb, 1393 fq_skb_free_func, 1394 fq_flow_get_default_func); 1395 } 1396 1397 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1398 struct sta_info *sta, 1399 struct txq_info *txqi, int tid) 1400 { 1401 fq_tin_init(&txqi->tin); 1402 fq_flow_init(&txqi->def_flow); 1403 codel_vars_init(&txqi->def_cvars); 1404 codel_stats_init(&txqi->cstats); 1405 __skb_queue_head_init(&txqi->frags); 1406 1407 txqi->txq.vif = &sdata->vif; 1408 1409 if (sta) { 1410 txqi->txq.sta = &sta->sta; 1411 sta->sta.txq[tid] = &txqi->txq; 1412 txqi->txq.tid = tid; 1413 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1414 } else { 1415 sdata->vif.txq = &txqi->txq; 1416 txqi->txq.tid = 0; 1417 txqi->txq.ac = IEEE80211_AC_BE; 1418 } 1419 } 1420 1421 void ieee80211_txq_purge(struct ieee80211_local *local, 1422 struct txq_info *txqi) 1423 { 1424 struct fq *fq = &local->fq; 1425 struct fq_tin *tin = &txqi->tin; 1426 1427 fq_tin_reset(fq, tin, fq_skb_free_func); 1428 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1429 } 1430 1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1432 { 1433 struct fq *fq = &local->fq; 1434 int ret; 1435 int i; 1436 bool supp_vht = false; 1437 enum nl80211_band band; 1438 1439 if (!local->ops->wake_tx_queue) 1440 return 0; 1441 1442 ret = fq_init(fq, 4096); 1443 if (ret) 1444 return ret; 1445 1446 /* 1447 * If the hardware doesn't support VHT, it is safe to limit the maximum 1448 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1449 */ 1450 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1451 struct ieee80211_supported_band *sband; 1452 1453 sband = local->hw.wiphy->bands[band]; 1454 if (!sband) 1455 continue; 1456 1457 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1458 } 1459 1460 if (!supp_vht) 1461 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1462 1463 codel_params_init(&local->cparams); 1464 local->cparams.interval = MS2TIME(100); 1465 local->cparams.target = MS2TIME(20); 1466 local->cparams.ecn = true; 1467 1468 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1469 GFP_KERNEL); 1470 if (!local->cvars) { 1471 spin_lock_bh(&fq->lock); 1472 fq_reset(fq, fq_skb_free_func); 1473 spin_unlock_bh(&fq->lock); 1474 return -ENOMEM; 1475 } 1476 1477 for (i = 0; i < fq->flows_cnt; i++) 1478 codel_vars_init(&local->cvars[i]); 1479 1480 return 0; 1481 } 1482 1483 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1484 { 1485 struct fq *fq = &local->fq; 1486 1487 if (!local->ops->wake_tx_queue) 1488 return; 1489 1490 kfree(local->cvars); 1491 local->cvars = NULL; 1492 1493 spin_lock_bh(&fq->lock); 1494 fq_reset(fq, fq_skb_free_func); 1495 spin_unlock_bh(&fq->lock); 1496 } 1497 1498 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1499 struct ieee80211_sub_if_data *sdata, 1500 struct sta_info *sta, 1501 struct sk_buff *skb) 1502 { 1503 struct fq *fq = &local->fq; 1504 struct ieee80211_vif *vif; 1505 struct txq_info *txqi; 1506 1507 if (!local->ops->wake_tx_queue || 1508 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1509 return false; 1510 1511 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1512 sdata = container_of(sdata->bss, 1513 struct ieee80211_sub_if_data, u.ap); 1514 1515 vif = &sdata->vif; 1516 txqi = ieee80211_get_txq(local, vif, sta, skb); 1517 1518 if (!txqi) 1519 return false; 1520 1521 spin_lock_bh(&fq->lock); 1522 ieee80211_txq_enqueue(local, txqi, skb); 1523 spin_unlock_bh(&fq->lock); 1524 1525 drv_wake_tx_queue(local, txqi); 1526 1527 return true; 1528 } 1529 1530 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1531 struct ieee80211_vif *vif, 1532 struct ieee80211_sta *sta, 1533 struct sk_buff_head *skbs, 1534 bool txpending) 1535 { 1536 struct ieee80211_tx_control control = {}; 1537 struct sk_buff *skb, *tmp; 1538 unsigned long flags; 1539 1540 skb_queue_walk_safe(skbs, skb, tmp) { 1541 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1542 int q = info->hw_queue; 1543 1544 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1545 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1546 __skb_unlink(skb, skbs); 1547 ieee80211_free_txskb(&local->hw, skb); 1548 continue; 1549 } 1550 #endif 1551 1552 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1553 if (local->queue_stop_reasons[q] || 1554 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1555 if (unlikely(info->flags & 1556 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1557 if (local->queue_stop_reasons[q] & 1558 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1559 /* 1560 * Drop off-channel frames if queues 1561 * are stopped for any reason other 1562 * than off-channel operation. Never 1563 * queue them. 1564 */ 1565 spin_unlock_irqrestore( 1566 &local->queue_stop_reason_lock, 1567 flags); 1568 ieee80211_purge_tx_queue(&local->hw, 1569 skbs); 1570 return true; 1571 } 1572 } else { 1573 1574 /* 1575 * Since queue is stopped, queue up frames for 1576 * later transmission from the tx-pending 1577 * tasklet when the queue is woken again. 1578 */ 1579 if (txpending) 1580 skb_queue_splice_init(skbs, 1581 &local->pending[q]); 1582 else 1583 skb_queue_splice_tail_init(skbs, 1584 &local->pending[q]); 1585 1586 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1587 flags); 1588 return false; 1589 } 1590 } 1591 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1592 1593 info->control.vif = vif; 1594 control.sta = sta; 1595 1596 __skb_unlink(skb, skbs); 1597 drv_tx(local, &control, skb); 1598 } 1599 1600 return true; 1601 } 1602 1603 /* 1604 * Returns false if the frame couldn't be transmitted but was queued instead. 1605 */ 1606 static bool __ieee80211_tx(struct ieee80211_local *local, 1607 struct sk_buff_head *skbs, int led_len, 1608 struct sta_info *sta, bool txpending) 1609 { 1610 struct ieee80211_tx_info *info; 1611 struct ieee80211_sub_if_data *sdata; 1612 struct ieee80211_vif *vif; 1613 struct ieee80211_sta *pubsta; 1614 struct sk_buff *skb; 1615 bool result = true; 1616 __le16 fc; 1617 1618 if (WARN_ON(skb_queue_empty(skbs))) 1619 return true; 1620 1621 skb = skb_peek(skbs); 1622 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1623 info = IEEE80211_SKB_CB(skb); 1624 sdata = vif_to_sdata(info->control.vif); 1625 if (sta && !sta->uploaded) 1626 sta = NULL; 1627 1628 if (sta) 1629 pubsta = &sta->sta; 1630 else 1631 pubsta = NULL; 1632 1633 switch (sdata->vif.type) { 1634 case NL80211_IFTYPE_MONITOR: 1635 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1636 vif = &sdata->vif; 1637 break; 1638 } 1639 sdata = rcu_dereference(local->monitor_sdata); 1640 if (sdata) { 1641 vif = &sdata->vif; 1642 info->hw_queue = 1643 vif->hw_queue[skb_get_queue_mapping(skb)]; 1644 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1645 ieee80211_purge_tx_queue(&local->hw, skbs); 1646 return true; 1647 } else 1648 vif = NULL; 1649 break; 1650 case NL80211_IFTYPE_AP_VLAN: 1651 sdata = container_of(sdata->bss, 1652 struct ieee80211_sub_if_data, u.ap); 1653 /* fall through */ 1654 default: 1655 vif = &sdata->vif; 1656 break; 1657 } 1658 1659 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1660 txpending); 1661 1662 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1663 1664 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1665 1666 return result; 1667 } 1668 1669 /* 1670 * Invoke TX handlers, return 0 on success and non-zero if the 1671 * frame was dropped or queued. 1672 * 1673 * The handlers are split into an early and late part. The latter is everything 1674 * that can be sensitive to reordering, and will be deferred to after packets 1675 * are dequeued from the intermediate queues (when they are enabled). 1676 */ 1677 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1678 { 1679 ieee80211_tx_result res = TX_DROP; 1680 1681 #define CALL_TXH(txh) \ 1682 do { \ 1683 res = txh(tx); \ 1684 if (res != TX_CONTINUE) \ 1685 goto txh_done; \ 1686 } while (0) 1687 1688 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1689 CALL_TXH(ieee80211_tx_h_check_assoc); 1690 CALL_TXH(ieee80211_tx_h_ps_buf); 1691 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1692 CALL_TXH(ieee80211_tx_h_select_key); 1693 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1694 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1695 1696 txh_done: 1697 if (unlikely(res == TX_DROP)) { 1698 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1699 if (tx->skb) 1700 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1701 else 1702 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1703 return -1; 1704 } else if (unlikely(res == TX_QUEUED)) { 1705 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1706 return -1; 1707 } 1708 1709 return 0; 1710 } 1711 1712 /* 1713 * Late handlers can be called while the sta lock is held. Handlers that can 1714 * cause packets to be generated will cause deadlock! 1715 */ 1716 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1717 { 1718 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1719 ieee80211_tx_result res = TX_CONTINUE; 1720 1721 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1722 __skb_queue_tail(&tx->skbs, tx->skb); 1723 tx->skb = NULL; 1724 goto txh_done; 1725 } 1726 1727 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1728 CALL_TXH(ieee80211_tx_h_sequence); 1729 CALL_TXH(ieee80211_tx_h_fragment); 1730 /* handlers after fragment must be aware of tx info fragmentation! */ 1731 CALL_TXH(ieee80211_tx_h_stats); 1732 CALL_TXH(ieee80211_tx_h_encrypt); 1733 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1734 CALL_TXH(ieee80211_tx_h_calculate_duration); 1735 #undef CALL_TXH 1736 1737 txh_done: 1738 if (unlikely(res == TX_DROP)) { 1739 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1740 if (tx->skb) 1741 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1742 else 1743 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1744 return -1; 1745 } else if (unlikely(res == TX_QUEUED)) { 1746 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1747 return -1; 1748 } 1749 1750 return 0; 1751 } 1752 1753 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1754 { 1755 int r = invoke_tx_handlers_early(tx); 1756 1757 if (r) 1758 return r; 1759 return invoke_tx_handlers_late(tx); 1760 } 1761 1762 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1763 struct ieee80211_vif *vif, struct sk_buff *skb, 1764 int band, struct ieee80211_sta **sta) 1765 { 1766 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1767 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1768 struct ieee80211_tx_data tx; 1769 struct sk_buff *skb2; 1770 1771 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1772 return false; 1773 1774 info->band = band; 1775 info->control.vif = vif; 1776 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1777 1778 if (invoke_tx_handlers(&tx)) 1779 return false; 1780 1781 if (sta) { 1782 if (tx.sta) 1783 *sta = &tx.sta->sta; 1784 else 1785 *sta = NULL; 1786 } 1787 1788 /* this function isn't suitable for fragmented data frames */ 1789 skb2 = __skb_dequeue(&tx.skbs); 1790 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1791 ieee80211_free_txskb(hw, skb2); 1792 ieee80211_purge_tx_queue(hw, &tx.skbs); 1793 return false; 1794 } 1795 1796 return true; 1797 } 1798 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1799 1800 /* 1801 * Returns false if the frame couldn't be transmitted but was queued instead. 1802 */ 1803 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1804 struct sta_info *sta, struct sk_buff *skb, 1805 bool txpending) 1806 { 1807 struct ieee80211_local *local = sdata->local; 1808 struct ieee80211_tx_data tx; 1809 ieee80211_tx_result res_prepare; 1810 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1811 bool result = true; 1812 int led_len; 1813 1814 if (unlikely(skb->len < 10)) { 1815 dev_kfree_skb(skb); 1816 return true; 1817 } 1818 1819 /* initialises tx */ 1820 led_len = skb->len; 1821 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1822 1823 if (unlikely(res_prepare == TX_DROP)) { 1824 ieee80211_free_txskb(&local->hw, skb); 1825 return true; 1826 } else if (unlikely(res_prepare == TX_QUEUED)) { 1827 return true; 1828 } 1829 1830 /* set up hw_queue value early */ 1831 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1832 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1833 info->hw_queue = 1834 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1835 1836 if (invoke_tx_handlers_early(&tx)) 1837 return false; 1838 1839 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1840 return true; 1841 1842 if (!invoke_tx_handlers_late(&tx)) 1843 result = __ieee80211_tx(local, &tx.skbs, led_len, 1844 tx.sta, txpending); 1845 1846 return result; 1847 } 1848 1849 /* device xmit handlers */ 1850 1851 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1852 struct sk_buff *skb, 1853 int head_need, bool may_encrypt) 1854 { 1855 struct ieee80211_local *local = sdata->local; 1856 int tail_need = 0; 1857 1858 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1859 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1860 tail_need -= skb_tailroom(skb); 1861 tail_need = max_t(int, tail_need, 0); 1862 } 1863 1864 if (skb_cloned(skb) && 1865 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1866 !skb_clone_writable(skb, ETH_HLEN) || 1867 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1868 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1869 else if (head_need || tail_need) 1870 I802_DEBUG_INC(local->tx_expand_skb_head); 1871 else 1872 return 0; 1873 1874 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1875 wiphy_debug(local->hw.wiphy, 1876 "failed to reallocate TX buffer\n"); 1877 return -ENOMEM; 1878 } 1879 1880 return 0; 1881 } 1882 1883 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1884 struct sta_info *sta, struct sk_buff *skb) 1885 { 1886 struct ieee80211_local *local = sdata->local; 1887 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1888 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1889 int headroom; 1890 bool may_encrypt; 1891 1892 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1893 1894 headroom = local->tx_headroom; 1895 if (may_encrypt) 1896 headroom += sdata->encrypt_headroom; 1897 headroom -= skb_headroom(skb); 1898 headroom = max_t(int, 0, headroom); 1899 1900 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1901 ieee80211_free_txskb(&local->hw, skb); 1902 return; 1903 } 1904 1905 hdr = (struct ieee80211_hdr *) skb->data; 1906 info->control.vif = &sdata->vif; 1907 1908 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1909 if (ieee80211_is_data(hdr->frame_control) && 1910 is_unicast_ether_addr(hdr->addr1)) { 1911 if (mesh_nexthop_resolve(sdata, skb)) 1912 return; /* skb queued: don't free */ 1913 } else { 1914 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1915 } 1916 } 1917 1918 ieee80211_set_qos_hdr(sdata, skb); 1919 ieee80211_tx(sdata, sta, skb, false); 1920 } 1921 1922 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1923 struct sk_buff *skb) 1924 { 1925 struct ieee80211_radiotap_iterator iterator; 1926 struct ieee80211_radiotap_header *rthdr = 1927 (struct ieee80211_radiotap_header *) skb->data; 1928 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1929 struct ieee80211_supported_band *sband = 1930 local->hw.wiphy->bands[info->band]; 1931 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1932 NULL); 1933 u16 txflags; 1934 u16 rate = 0; 1935 bool rate_found = false; 1936 u8 rate_retries = 0; 1937 u16 rate_flags = 0; 1938 u8 mcs_known, mcs_flags, mcs_bw; 1939 u16 vht_known; 1940 u8 vht_mcs = 0, vht_nss = 0; 1941 int i; 1942 1943 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1944 IEEE80211_TX_CTL_DONTFRAG; 1945 1946 /* 1947 * for every radiotap entry that is present 1948 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1949 * entries present, or -EINVAL on error) 1950 */ 1951 1952 while (!ret) { 1953 ret = ieee80211_radiotap_iterator_next(&iterator); 1954 1955 if (ret) 1956 continue; 1957 1958 /* see if this argument is something we can use */ 1959 switch (iterator.this_arg_index) { 1960 /* 1961 * You must take care when dereferencing iterator.this_arg 1962 * for multibyte types... the pointer is not aligned. Use 1963 * get_unaligned((type *)iterator.this_arg) to dereference 1964 * iterator.this_arg for type "type" safely on all arches. 1965 */ 1966 case IEEE80211_RADIOTAP_FLAGS: 1967 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1968 /* 1969 * this indicates that the skb we have been 1970 * handed has the 32-bit FCS CRC at the end... 1971 * we should react to that by snipping it off 1972 * because it will be recomputed and added 1973 * on transmission 1974 */ 1975 if (skb->len < (iterator._max_length + FCS_LEN)) 1976 return false; 1977 1978 skb_trim(skb, skb->len - FCS_LEN); 1979 } 1980 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1981 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1982 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1983 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1984 break; 1985 1986 case IEEE80211_RADIOTAP_TX_FLAGS: 1987 txflags = get_unaligned_le16(iterator.this_arg); 1988 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1989 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1990 break; 1991 1992 case IEEE80211_RADIOTAP_RATE: 1993 rate = *iterator.this_arg; 1994 rate_flags = 0; 1995 rate_found = true; 1996 break; 1997 1998 case IEEE80211_RADIOTAP_DATA_RETRIES: 1999 rate_retries = *iterator.this_arg; 2000 break; 2001 2002 case IEEE80211_RADIOTAP_MCS: 2003 mcs_known = iterator.this_arg[0]; 2004 mcs_flags = iterator.this_arg[1]; 2005 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2006 break; 2007 2008 rate_found = true; 2009 rate = iterator.this_arg[2]; 2010 rate_flags = IEEE80211_TX_RC_MCS; 2011 2012 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2013 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2014 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2015 2016 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2017 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2018 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2019 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2020 break; 2021 2022 case IEEE80211_RADIOTAP_VHT: 2023 vht_known = get_unaligned_le16(iterator.this_arg); 2024 rate_found = true; 2025 2026 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2027 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2028 (iterator.this_arg[2] & 2029 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2030 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2031 if (vht_known & 2032 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2033 if (iterator.this_arg[3] == 1) 2034 rate_flags |= 2035 IEEE80211_TX_RC_40_MHZ_WIDTH; 2036 else if (iterator.this_arg[3] == 4) 2037 rate_flags |= 2038 IEEE80211_TX_RC_80_MHZ_WIDTH; 2039 else if (iterator.this_arg[3] == 11) 2040 rate_flags |= 2041 IEEE80211_TX_RC_160_MHZ_WIDTH; 2042 } 2043 2044 vht_mcs = iterator.this_arg[4] >> 4; 2045 vht_nss = iterator.this_arg[4] & 0xF; 2046 break; 2047 2048 /* 2049 * Please update the file 2050 * Documentation/networking/mac80211-injection.txt 2051 * when parsing new fields here. 2052 */ 2053 2054 default: 2055 break; 2056 } 2057 } 2058 2059 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2060 return false; 2061 2062 if (rate_found) { 2063 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2064 2065 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2066 info->control.rates[i].idx = -1; 2067 info->control.rates[i].flags = 0; 2068 info->control.rates[i].count = 0; 2069 } 2070 2071 if (rate_flags & IEEE80211_TX_RC_MCS) { 2072 info->control.rates[0].idx = rate; 2073 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2074 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2075 vht_nss); 2076 } else { 2077 for (i = 0; i < sband->n_bitrates; i++) { 2078 if (rate * 5 != sband->bitrates[i].bitrate) 2079 continue; 2080 2081 info->control.rates[0].idx = i; 2082 break; 2083 } 2084 } 2085 2086 if (info->control.rates[0].idx < 0) 2087 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2088 2089 info->control.rates[0].flags = rate_flags; 2090 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2091 local->hw.max_rate_tries); 2092 } 2093 2094 /* 2095 * remove the radiotap header 2096 * iterator->_max_length was sanity-checked against 2097 * skb->len by iterator init 2098 */ 2099 skb_pull(skb, iterator._max_length); 2100 2101 return true; 2102 } 2103 2104 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2105 struct net_device *dev) 2106 { 2107 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2108 struct ieee80211_chanctx_conf *chanctx_conf; 2109 struct ieee80211_radiotap_header *prthdr = 2110 (struct ieee80211_radiotap_header *)skb->data; 2111 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2112 struct ieee80211_hdr *hdr; 2113 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2114 struct cfg80211_chan_def *chandef; 2115 u16 len_rthdr; 2116 int hdrlen; 2117 2118 /* check for not even having the fixed radiotap header part */ 2119 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2120 goto fail; /* too short to be possibly valid */ 2121 2122 /* is it a header version we can trust to find length from? */ 2123 if (unlikely(prthdr->it_version)) 2124 goto fail; /* only version 0 is supported */ 2125 2126 /* then there must be a radiotap header with a length we can use */ 2127 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2128 2129 /* does the skb contain enough to deliver on the alleged length? */ 2130 if (unlikely(skb->len < len_rthdr)) 2131 goto fail; /* skb too short for claimed rt header extent */ 2132 2133 /* 2134 * fix up the pointers accounting for the radiotap 2135 * header still being in there. We are being given 2136 * a precooked IEEE80211 header so no need for 2137 * normal processing 2138 */ 2139 skb_set_mac_header(skb, len_rthdr); 2140 /* 2141 * these are just fixed to the end of the rt area since we 2142 * don't have any better information and at this point, nobody cares 2143 */ 2144 skb_set_network_header(skb, len_rthdr); 2145 skb_set_transport_header(skb, len_rthdr); 2146 2147 if (skb->len < len_rthdr + 2) 2148 goto fail; 2149 2150 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2151 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2152 2153 if (skb->len < len_rthdr + hdrlen) 2154 goto fail; 2155 2156 /* 2157 * Initialize skb->protocol if the injected frame is a data frame 2158 * carrying a rfc1042 header 2159 */ 2160 if (ieee80211_is_data(hdr->frame_control) && 2161 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2162 u8 *payload = (u8 *)hdr + hdrlen; 2163 2164 if (ether_addr_equal(payload, rfc1042_header)) 2165 skb->protocol = cpu_to_be16((payload[6] << 8) | 2166 payload[7]); 2167 } 2168 2169 memset(info, 0, sizeof(*info)); 2170 2171 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2172 IEEE80211_TX_CTL_INJECTED; 2173 2174 rcu_read_lock(); 2175 2176 /* 2177 * We process outgoing injected frames that have a local address 2178 * we handle as though they are non-injected frames. 2179 * This code here isn't entirely correct, the local MAC address 2180 * isn't always enough to find the interface to use; for proper 2181 * VLAN/WDS support we will need a different mechanism (which 2182 * likely isn't going to be monitor interfaces). 2183 */ 2184 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2185 2186 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2187 if (!ieee80211_sdata_running(tmp_sdata)) 2188 continue; 2189 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2190 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2191 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2192 continue; 2193 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2194 sdata = tmp_sdata; 2195 break; 2196 } 2197 } 2198 2199 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2200 if (!chanctx_conf) { 2201 tmp_sdata = rcu_dereference(local->monitor_sdata); 2202 if (tmp_sdata) 2203 chanctx_conf = 2204 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2205 } 2206 2207 if (chanctx_conf) 2208 chandef = &chanctx_conf->def; 2209 else if (!local->use_chanctx) 2210 chandef = &local->_oper_chandef; 2211 else 2212 goto fail_rcu; 2213 2214 /* 2215 * Frame injection is not allowed if beaconing is not allowed 2216 * or if we need radar detection. Beaconing is usually not allowed when 2217 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2218 * Passive scan is also used in world regulatory domains where 2219 * your country is not known and as such it should be treated as 2220 * NO TX unless the channel is explicitly allowed in which case 2221 * your current regulatory domain would not have the passive scan 2222 * flag. 2223 * 2224 * Since AP mode uses monitor interfaces to inject/TX management 2225 * frames we can make AP mode the exception to this rule once it 2226 * supports radar detection as its implementation can deal with 2227 * radar detection by itself. We can do that later by adding a 2228 * monitor flag interfaces used for AP support. 2229 */ 2230 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2231 sdata->vif.type)) 2232 goto fail_rcu; 2233 2234 info->band = chandef->chan->band; 2235 2236 /* process and remove the injection radiotap header */ 2237 if (!ieee80211_parse_tx_radiotap(local, skb)) 2238 goto fail_rcu; 2239 2240 ieee80211_xmit(sdata, NULL, skb); 2241 rcu_read_unlock(); 2242 2243 return NETDEV_TX_OK; 2244 2245 fail_rcu: 2246 rcu_read_unlock(); 2247 fail: 2248 dev_kfree_skb(skb); 2249 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2250 } 2251 2252 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2253 { 2254 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2255 2256 return ethertype == ETH_P_TDLS && 2257 skb->len > 14 && 2258 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2259 } 2260 2261 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2262 struct sk_buff *skb, 2263 struct sta_info **sta_out) 2264 { 2265 struct sta_info *sta; 2266 2267 switch (sdata->vif.type) { 2268 case NL80211_IFTYPE_AP_VLAN: 2269 sta = rcu_dereference(sdata->u.vlan.sta); 2270 if (sta) { 2271 *sta_out = sta; 2272 return 0; 2273 } else if (sdata->wdev.use_4addr) { 2274 return -ENOLINK; 2275 } 2276 /* fall through */ 2277 case NL80211_IFTYPE_AP: 2278 case NL80211_IFTYPE_OCB: 2279 case NL80211_IFTYPE_ADHOC: 2280 if (is_multicast_ether_addr(skb->data)) { 2281 *sta_out = ERR_PTR(-ENOENT); 2282 return 0; 2283 } 2284 sta = sta_info_get_bss(sdata, skb->data); 2285 break; 2286 case NL80211_IFTYPE_WDS: 2287 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2288 break; 2289 #ifdef CONFIG_MAC80211_MESH 2290 case NL80211_IFTYPE_MESH_POINT: 2291 /* determined much later */ 2292 *sta_out = NULL; 2293 return 0; 2294 #endif 2295 case NL80211_IFTYPE_STATION: 2296 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2297 sta = sta_info_get(sdata, skb->data); 2298 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2299 if (test_sta_flag(sta, 2300 WLAN_STA_TDLS_PEER_AUTH)) { 2301 *sta_out = sta; 2302 return 0; 2303 } 2304 2305 /* 2306 * TDLS link during setup - throw out frames to 2307 * peer. Allow TDLS-setup frames to unauthorized 2308 * peers for the special case of a link teardown 2309 * after a TDLS sta is removed due to being 2310 * unreachable. 2311 */ 2312 if (!ieee80211_is_tdls_setup(skb)) 2313 return -EINVAL; 2314 } 2315 2316 } 2317 2318 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2319 if (!sta) 2320 return -ENOLINK; 2321 break; 2322 default: 2323 return -EINVAL; 2324 } 2325 2326 *sta_out = sta ?: ERR_PTR(-ENOENT); 2327 return 0; 2328 } 2329 2330 /** 2331 * ieee80211_build_hdr - build 802.11 header in the given frame 2332 * @sdata: virtual interface to build the header for 2333 * @skb: the skb to build the header in 2334 * @info_flags: skb flags to set 2335 * 2336 * This function takes the skb with 802.3 header and reformats the header to 2337 * the appropriate IEEE 802.11 header based on which interface the packet is 2338 * being transmitted on. 2339 * 2340 * Note that this function also takes care of the TX status request and 2341 * potential unsharing of the SKB - this needs to be interleaved with the 2342 * header building. 2343 * 2344 * The function requires the read-side RCU lock held 2345 * 2346 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2347 */ 2348 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2349 struct sk_buff *skb, u32 info_flags, 2350 struct sta_info *sta) 2351 { 2352 struct ieee80211_local *local = sdata->local; 2353 struct ieee80211_tx_info *info; 2354 int head_need; 2355 u16 ethertype, hdrlen, meshhdrlen = 0; 2356 __le16 fc; 2357 struct ieee80211_hdr hdr; 2358 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2359 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2360 const u8 *encaps_data; 2361 int encaps_len, skip_header_bytes; 2362 bool wme_sta = false, authorized = false; 2363 bool tdls_peer; 2364 bool multicast; 2365 u16 info_id = 0; 2366 struct ieee80211_chanctx_conf *chanctx_conf; 2367 struct ieee80211_sub_if_data *ap_sdata; 2368 enum nl80211_band band; 2369 int ret; 2370 2371 if (IS_ERR(sta)) 2372 sta = NULL; 2373 2374 /* convert Ethernet header to proper 802.11 header (based on 2375 * operation mode) */ 2376 ethertype = (skb->data[12] << 8) | skb->data[13]; 2377 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2378 2379 switch (sdata->vif.type) { 2380 case NL80211_IFTYPE_AP_VLAN: 2381 if (sdata->wdev.use_4addr) { 2382 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2383 /* RA TA DA SA */ 2384 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2385 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2386 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2387 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2388 hdrlen = 30; 2389 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2390 wme_sta = sta->sta.wme; 2391 } 2392 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2393 u.ap); 2394 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2395 if (!chanctx_conf) { 2396 ret = -ENOTCONN; 2397 goto free; 2398 } 2399 band = chanctx_conf->def.chan->band; 2400 if (sdata->wdev.use_4addr) 2401 break; 2402 /* fall through */ 2403 case NL80211_IFTYPE_AP: 2404 if (sdata->vif.type == NL80211_IFTYPE_AP) 2405 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2406 if (!chanctx_conf) { 2407 ret = -ENOTCONN; 2408 goto free; 2409 } 2410 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2411 /* DA BSSID SA */ 2412 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2413 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2414 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2415 hdrlen = 24; 2416 band = chanctx_conf->def.chan->band; 2417 break; 2418 case NL80211_IFTYPE_WDS: 2419 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2420 /* RA TA DA SA */ 2421 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2422 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2423 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2424 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2425 hdrlen = 30; 2426 /* 2427 * This is the exception! WDS style interfaces are prohibited 2428 * when channel contexts are in used so this must be valid 2429 */ 2430 band = local->hw.conf.chandef.chan->band; 2431 break; 2432 #ifdef CONFIG_MAC80211_MESH 2433 case NL80211_IFTYPE_MESH_POINT: 2434 if (!is_multicast_ether_addr(skb->data)) { 2435 struct sta_info *next_hop; 2436 bool mpp_lookup = true; 2437 2438 mpath = mesh_path_lookup(sdata, skb->data); 2439 if (mpath) { 2440 mpp_lookup = false; 2441 next_hop = rcu_dereference(mpath->next_hop); 2442 if (!next_hop || 2443 !(mpath->flags & (MESH_PATH_ACTIVE | 2444 MESH_PATH_RESOLVING))) 2445 mpp_lookup = true; 2446 } 2447 2448 if (mpp_lookup) { 2449 mppath = mpp_path_lookup(sdata, skb->data); 2450 if (mppath) 2451 mppath->exp_time = jiffies; 2452 } 2453 2454 if (mppath && mpath) 2455 mesh_path_del(sdata, mpath->dst); 2456 } 2457 2458 /* 2459 * Use address extension if it is a packet from 2460 * another interface or if we know the destination 2461 * is being proxied by a portal (i.e. portal address 2462 * differs from proxied address) 2463 */ 2464 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2465 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2466 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2467 skb->data, skb->data + ETH_ALEN); 2468 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2469 NULL, NULL); 2470 } else { 2471 /* DS -> MBSS (802.11-2012 13.11.3.3). 2472 * For unicast with unknown forwarding information, 2473 * destination might be in the MBSS or if that fails 2474 * forwarded to another mesh gate. In either case 2475 * resolution will be handled in ieee80211_xmit(), so 2476 * leave the original DA. This also works for mcast */ 2477 const u8 *mesh_da = skb->data; 2478 2479 if (mppath) 2480 mesh_da = mppath->mpp; 2481 else if (mpath) 2482 mesh_da = mpath->dst; 2483 2484 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2485 mesh_da, sdata->vif.addr); 2486 if (is_multicast_ether_addr(mesh_da)) 2487 /* DA TA mSA AE:SA */ 2488 meshhdrlen = ieee80211_new_mesh_header( 2489 sdata, &mesh_hdr, 2490 skb->data + ETH_ALEN, NULL); 2491 else 2492 /* RA TA mDA mSA AE:DA SA */ 2493 meshhdrlen = ieee80211_new_mesh_header( 2494 sdata, &mesh_hdr, skb->data, 2495 skb->data + ETH_ALEN); 2496 2497 } 2498 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2499 if (!chanctx_conf) { 2500 ret = -ENOTCONN; 2501 goto free; 2502 } 2503 band = chanctx_conf->def.chan->band; 2504 break; 2505 #endif 2506 case NL80211_IFTYPE_STATION: 2507 /* we already did checks when looking up the RA STA */ 2508 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2509 2510 if (tdls_peer) { 2511 /* DA SA BSSID */ 2512 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2513 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2514 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2515 hdrlen = 24; 2516 } else if (sdata->u.mgd.use_4addr && 2517 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2519 IEEE80211_FCTL_TODS); 2520 /* RA TA DA SA */ 2521 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2522 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2523 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2524 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2525 hdrlen = 30; 2526 } else { 2527 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2528 /* BSSID SA DA */ 2529 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2530 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2531 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2532 hdrlen = 24; 2533 } 2534 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2535 if (!chanctx_conf) { 2536 ret = -ENOTCONN; 2537 goto free; 2538 } 2539 band = chanctx_conf->def.chan->band; 2540 break; 2541 case NL80211_IFTYPE_OCB: 2542 /* DA SA BSSID */ 2543 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2544 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2545 eth_broadcast_addr(hdr.addr3); 2546 hdrlen = 24; 2547 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2548 if (!chanctx_conf) { 2549 ret = -ENOTCONN; 2550 goto free; 2551 } 2552 band = chanctx_conf->def.chan->band; 2553 break; 2554 case NL80211_IFTYPE_ADHOC: 2555 /* DA SA BSSID */ 2556 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2557 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2558 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2559 hdrlen = 24; 2560 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2561 if (!chanctx_conf) { 2562 ret = -ENOTCONN; 2563 goto free; 2564 } 2565 band = chanctx_conf->def.chan->band; 2566 break; 2567 default: 2568 ret = -EINVAL; 2569 goto free; 2570 } 2571 2572 multicast = is_multicast_ether_addr(hdr.addr1); 2573 2574 /* sta is always NULL for mesh */ 2575 if (sta) { 2576 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2577 wme_sta = sta->sta.wme; 2578 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2579 /* For mesh, the use of the QoS header is mandatory */ 2580 wme_sta = true; 2581 } 2582 2583 /* receiver does QoS (which also means we do) use it */ 2584 if (wme_sta) { 2585 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2586 hdrlen += 2; 2587 } 2588 2589 /* 2590 * Drop unicast frames to unauthorised stations unless they are 2591 * EAPOL frames from the local station. 2592 */ 2593 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2594 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2595 !multicast && !authorized && 2596 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2597 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2598 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2599 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2600 sdata->name, hdr.addr1); 2601 #endif 2602 2603 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2604 2605 ret = -EPERM; 2606 goto free; 2607 } 2608 2609 if (unlikely(!multicast && skb->sk && 2610 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2611 struct sk_buff *ack_skb = skb_clone_sk(skb); 2612 2613 if (ack_skb) { 2614 unsigned long flags; 2615 int id; 2616 2617 spin_lock_irqsave(&local->ack_status_lock, flags); 2618 id = idr_alloc(&local->ack_status_frames, ack_skb, 2619 1, 0x10000, GFP_ATOMIC); 2620 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2621 2622 if (id >= 0) { 2623 info_id = id; 2624 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2625 } else { 2626 kfree_skb(ack_skb); 2627 } 2628 } 2629 } 2630 2631 /* 2632 * If the skb is shared we need to obtain our own copy. 2633 */ 2634 if (skb_shared(skb)) { 2635 struct sk_buff *tmp_skb = skb; 2636 2637 /* can't happen -- skb is a clone if info_id != 0 */ 2638 WARN_ON(info_id); 2639 2640 skb = skb_clone(skb, GFP_ATOMIC); 2641 kfree_skb(tmp_skb); 2642 2643 if (!skb) { 2644 ret = -ENOMEM; 2645 goto free; 2646 } 2647 } 2648 2649 hdr.frame_control = fc; 2650 hdr.duration_id = 0; 2651 hdr.seq_ctrl = 0; 2652 2653 skip_header_bytes = ETH_HLEN; 2654 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2655 encaps_data = bridge_tunnel_header; 2656 encaps_len = sizeof(bridge_tunnel_header); 2657 skip_header_bytes -= 2; 2658 } else if (ethertype >= ETH_P_802_3_MIN) { 2659 encaps_data = rfc1042_header; 2660 encaps_len = sizeof(rfc1042_header); 2661 skip_header_bytes -= 2; 2662 } else { 2663 encaps_data = NULL; 2664 encaps_len = 0; 2665 } 2666 2667 skb_pull(skb, skip_header_bytes); 2668 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2669 2670 /* 2671 * So we need to modify the skb header and hence need a copy of 2672 * that. The head_need variable above doesn't, so far, include 2673 * the needed header space that we don't need right away. If we 2674 * can, then we don't reallocate right now but only after the 2675 * frame arrives at the master device (if it does...) 2676 * 2677 * If we cannot, however, then we will reallocate to include all 2678 * the ever needed space. Also, if we need to reallocate it anyway, 2679 * make it big enough for everything we may ever need. 2680 */ 2681 2682 if (head_need > 0 || skb_cloned(skb)) { 2683 head_need += sdata->encrypt_headroom; 2684 head_need += local->tx_headroom; 2685 head_need = max_t(int, 0, head_need); 2686 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2687 ieee80211_free_txskb(&local->hw, skb); 2688 skb = NULL; 2689 return ERR_PTR(-ENOMEM); 2690 } 2691 } 2692 2693 if (encaps_data) 2694 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2695 2696 #ifdef CONFIG_MAC80211_MESH 2697 if (meshhdrlen > 0) 2698 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2699 #endif 2700 2701 if (ieee80211_is_data_qos(fc)) { 2702 __le16 *qos_control; 2703 2704 qos_control = (__le16 *) skb_push(skb, 2); 2705 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2706 /* 2707 * Maybe we could actually set some fields here, for now just 2708 * initialise to zero to indicate no special operation. 2709 */ 2710 *qos_control = 0; 2711 } else 2712 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2713 2714 skb_reset_mac_header(skb); 2715 2716 info = IEEE80211_SKB_CB(skb); 2717 memset(info, 0, sizeof(*info)); 2718 2719 info->flags = info_flags; 2720 info->ack_frame_id = info_id; 2721 info->band = band; 2722 2723 return skb; 2724 free: 2725 kfree_skb(skb); 2726 return ERR_PTR(ret); 2727 } 2728 2729 /* 2730 * fast-xmit overview 2731 * 2732 * The core idea of this fast-xmit is to remove per-packet checks by checking 2733 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2734 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2735 * much less work can be done per packet. For example, fragmentation must be 2736 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2737 * in the code here. 2738 * 2739 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2740 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2741 * 2742 * The most difficult part of this is that when any of these assumptions 2743 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2744 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2745 * since the per-packet code no longer checks the conditions. This is reflected 2746 * by the calls to these functions throughout the rest of the code, and must be 2747 * maintained if any of the TX path checks change. 2748 */ 2749 2750 void ieee80211_check_fast_xmit(struct sta_info *sta) 2751 { 2752 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2753 struct ieee80211_local *local = sta->local; 2754 struct ieee80211_sub_if_data *sdata = sta->sdata; 2755 struct ieee80211_hdr *hdr = (void *)build.hdr; 2756 struct ieee80211_chanctx_conf *chanctx_conf; 2757 __le16 fc; 2758 2759 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2760 return; 2761 2762 /* Locking here protects both the pointer itself, and against concurrent 2763 * invocations winning data access races to, e.g., the key pointer that 2764 * is used. 2765 * Without it, the invocation of this function right after the key 2766 * pointer changes wouldn't be sufficient, as another CPU could access 2767 * the pointer, then stall, and then do the cache update after the CPU 2768 * that invalidated the key. 2769 * With the locking, such scenarios cannot happen as the check for the 2770 * key and the fast-tx assignment are done atomically, so the CPU that 2771 * modifies the key will either wait or other one will see the key 2772 * cleared/changed already. 2773 */ 2774 spin_lock_bh(&sta->lock); 2775 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2776 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2777 sdata->vif.type == NL80211_IFTYPE_STATION) 2778 goto out; 2779 2780 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2781 goto out; 2782 2783 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2784 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2785 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2786 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2787 goto out; 2788 2789 if (sdata->noack_map) 2790 goto out; 2791 2792 /* fast-xmit doesn't handle fragmentation at all */ 2793 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2794 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2795 goto out; 2796 2797 rcu_read_lock(); 2798 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2799 if (!chanctx_conf) { 2800 rcu_read_unlock(); 2801 goto out; 2802 } 2803 build.band = chanctx_conf->def.chan->band; 2804 rcu_read_unlock(); 2805 2806 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2807 2808 switch (sdata->vif.type) { 2809 case NL80211_IFTYPE_ADHOC: 2810 /* DA SA BSSID */ 2811 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2812 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2813 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2814 build.hdr_len = 24; 2815 break; 2816 case NL80211_IFTYPE_STATION: 2817 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2818 /* DA SA BSSID */ 2819 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2820 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2821 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2822 build.hdr_len = 24; 2823 break; 2824 } 2825 2826 if (sdata->u.mgd.use_4addr) { 2827 /* non-regular ethertype cannot use the fastpath */ 2828 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2829 IEEE80211_FCTL_TODS); 2830 /* RA TA DA SA */ 2831 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2832 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2833 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2834 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2835 build.hdr_len = 30; 2836 break; 2837 } 2838 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2839 /* BSSID SA DA */ 2840 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2841 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2842 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2843 build.hdr_len = 24; 2844 break; 2845 case NL80211_IFTYPE_AP_VLAN: 2846 if (sdata->wdev.use_4addr) { 2847 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2848 IEEE80211_FCTL_TODS); 2849 /* RA TA DA SA */ 2850 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2851 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2852 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2853 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2854 build.hdr_len = 30; 2855 break; 2856 } 2857 /* fall through */ 2858 case NL80211_IFTYPE_AP: 2859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2860 /* DA BSSID SA */ 2861 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2862 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2863 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2864 build.hdr_len = 24; 2865 break; 2866 default: 2867 /* not handled on fast-xmit */ 2868 goto out; 2869 } 2870 2871 if (sta->sta.wme) { 2872 build.hdr_len += 2; 2873 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2874 } 2875 2876 /* We store the key here so there's no point in using rcu_dereference() 2877 * but that's fine because the code that changes the pointers will call 2878 * this function after doing so. For a single CPU that would be enough, 2879 * for multiple see the comment above. 2880 */ 2881 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2882 if (!build.key) 2883 build.key = rcu_access_pointer(sdata->default_unicast_key); 2884 if (build.key) { 2885 bool gen_iv, iv_spc, mmic; 2886 2887 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2888 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2889 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2890 2891 /* don't handle software crypto */ 2892 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2893 goto out; 2894 2895 switch (build.key->conf.cipher) { 2896 case WLAN_CIPHER_SUITE_CCMP: 2897 case WLAN_CIPHER_SUITE_CCMP_256: 2898 /* add fixed key ID */ 2899 if (gen_iv) { 2900 (build.hdr + build.hdr_len)[3] = 2901 0x20 | (build.key->conf.keyidx << 6); 2902 build.pn_offs = build.hdr_len; 2903 } 2904 if (gen_iv || iv_spc) 2905 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2906 break; 2907 case WLAN_CIPHER_SUITE_GCMP: 2908 case WLAN_CIPHER_SUITE_GCMP_256: 2909 /* add fixed key ID */ 2910 if (gen_iv) { 2911 (build.hdr + build.hdr_len)[3] = 2912 0x20 | (build.key->conf.keyidx << 6); 2913 build.pn_offs = build.hdr_len; 2914 } 2915 if (gen_iv || iv_spc) 2916 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2917 break; 2918 case WLAN_CIPHER_SUITE_TKIP: 2919 /* cannot handle MMIC or IV generation in xmit-fast */ 2920 if (mmic || gen_iv) 2921 goto out; 2922 if (iv_spc) 2923 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2924 break; 2925 case WLAN_CIPHER_SUITE_WEP40: 2926 case WLAN_CIPHER_SUITE_WEP104: 2927 /* cannot handle IV generation in fast-xmit */ 2928 if (gen_iv) 2929 goto out; 2930 if (iv_spc) 2931 build.hdr_len += IEEE80211_WEP_IV_LEN; 2932 break; 2933 case WLAN_CIPHER_SUITE_AES_CMAC: 2934 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2935 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2936 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2937 WARN(1, 2938 "management cipher suite 0x%x enabled for data\n", 2939 build.key->conf.cipher); 2940 goto out; 2941 default: 2942 /* we don't know how to generate IVs for this at all */ 2943 if (WARN_ON(gen_iv)) 2944 goto out; 2945 /* pure hardware keys are OK, of course */ 2946 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2947 break; 2948 /* cipher scheme might require space allocation */ 2949 if (iv_spc && 2950 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2951 goto out; 2952 if (iv_spc) 2953 build.hdr_len += build.key->conf.iv_len; 2954 } 2955 2956 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2957 } 2958 2959 hdr->frame_control = fc; 2960 2961 memcpy(build.hdr + build.hdr_len, 2962 rfc1042_header, sizeof(rfc1042_header)); 2963 build.hdr_len += sizeof(rfc1042_header); 2964 2965 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2966 /* if the kmemdup fails, continue w/o fast_tx */ 2967 if (!fast_tx) 2968 goto out; 2969 2970 out: 2971 /* we might have raced against another call to this function */ 2972 old = rcu_dereference_protected(sta->fast_tx, 2973 lockdep_is_held(&sta->lock)); 2974 rcu_assign_pointer(sta->fast_tx, fast_tx); 2975 if (old) 2976 kfree_rcu(old, rcu_head); 2977 spin_unlock_bh(&sta->lock); 2978 } 2979 2980 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2981 { 2982 struct sta_info *sta; 2983 2984 rcu_read_lock(); 2985 list_for_each_entry_rcu(sta, &local->sta_list, list) 2986 ieee80211_check_fast_xmit(sta); 2987 rcu_read_unlock(); 2988 } 2989 2990 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2991 { 2992 struct ieee80211_local *local = sdata->local; 2993 struct sta_info *sta; 2994 2995 rcu_read_lock(); 2996 2997 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2998 if (sdata != sta->sdata && 2999 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3000 continue; 3001 ieee80211_check_fast_xmit(sta); 3002 } 3003 3004 rcu_read_unlock(); 3005 } 3006 3007 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3008 { 3009 struct ieee80211_fast_tx *fast_tx; 3010 3011 spin_lock_bh(&sta->lock); 3012 fast_tx = rcu_dereference_protected(sta->fast_tx, 3013 lockdep_is_held(&sta->lock)); 3014 RCU_INIT_POINTER(sta->fast_tx, NULL); 3015 spin_unlock_bh(&sta->lock); 3016 3017 if (fast_tx) 3018 kfree_rcu(fast_tx, rcu_head); 3019 } 3020 3021 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3022 struct sk_buff *skb, int headroom, 3023 int *subframe_len) 3024 { 3025 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3026 int padding = (4 - amsdu_len) & 3; 3027 3028 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3029 I802_DEBUG_INC(local->tx_expand_skb_head); 3030 3031 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3032 wiphy_debug(local->hw.wiphy, 3033 "failed to reallocate TX buffer\n"); 3034 return false; 3035 } 3036 } 3037 3038 if (padding) { 3039 *subframe_len += padding; 3040 memset(skb_put(skb, padding), 0, padding); 3041 } 3042 3043 return true; 3044 } 3045 3046 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3047 struct ieee80211_fast_tx *fast_tx, 3048 struct sk_buff *skb) 3049 { 3050 struct ieee80211_local *local = sdata->local; 3051 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3052 struct ieee80211_hdr *hdr; 3053 struct ethhdr *amsdu_hdr; 3054 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3055 int subframe_len = skb->len - hdr_len; 3056 void *data; 3057 u8 *qc, *h_80211_src, *h_80211_dst; 3058 const u8 *bssid; 3059 3060 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3061 return false; 3062 3063 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3064 return true; 3065 3066 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3067 &subframe_len)) 3068 return false; 3069 3070 data = skb_push(skb, sizeof(*amsdu_hdr)); 3071 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3072 hdr = data; 3073 amsdu_hdr = data + hdr_len; 3074 /* h_80211_src/dst is addr* field within hdr */ 3075 h_80211_src = data + fast_tx->sa_offs; 3076 h_80211_dst = data + fast_tx->da_offs; 3077 3078 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3079 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3080 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3081 3082 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3083 * fields needs to be changed to BSSID for A-MSDU frames depending 3084 * on FromDS/ToDS values. 3085 */ 3086 switch (sdata->vif.type) { 3087 case NL80211_IFTYPE_STATION: 3088 bssid = sdata->u.mgd.bssid; 3089 break; 3090 case NL80211_IFTYPE_AP: 3091 case NL80211_IFTYPE_AP_VLAN: 3092 bssid = sdata->vif.addr; 3093 break; 3094 default: 3095 bssid = NULL; 3096 } 3097 3098 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3099 ether_addr_copy(h_80211_src, bssid); 3100 3101 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3102 ether_addr_copy(h_80211_dst, bssid); 3103 3104 qc = ieee80211_get_qos_ctl(hdr); 3105 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3106 3107 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3108 3109 return true; 3110 } 3111 3112 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3113 struct sta_info *sta, 3114 struct ieee80211_fast_tx *fast_tx, 3115 struct sk_buff *skb) 3116 { 3117 struct ieee80211_local *local = sdata->local; 3118 struct fq *fq = &local->fq; 3119 struct fq_tin *tin; 3120 struct fq_flow *flow; 3121 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3122 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3123 struct txq_info *txqi; 3124 struct sk_buff **frag_tail, *head; 3125 int subframe_len = skb->len - ETH_ALEN; 3126 u8 max_subframes = sta->sta.max_amsdu_subframes; 3127 int max_frags = local->hw.max_tx_fragments; 3128 int max_amsdu_len = sta->sta.max_amsdu_len; 3129 __be16 len; 3130 void *data; 3131 bool ret = false; 3132 unsigned int orig_len; 3133 int n = 1, nfrags; 3134 3135 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3136 return false; 3137 3138 if (!txq) 3139 return false; 3140 3141 txqi = to_txq_info(txq); 3142 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3143 return false; 3144 3145 if (sta->sta.max_rc_amsdu_len) 3146 max_amsdu_len = min_t(int, max_amsdu_len, 3147 sta->sta.max_rc_amsdu_len); 3148 3149 spin_lock_bh(&fq->lock); 3150 3151 /* TODO: Ideally aggregation should be done on dequeue to remain 3152 * responsive to environment changes. 3153 */ 3154 3155 tin = &txqi->tin; 3156 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3157 head = skb_peek_tail(&flow->queue); 3158 if (!head) 3159 goto out; 3160 3161 orig_len = head->len; 3162 3163 if (skb->len + head->len > max_amsdu_len) 3164 goto out; 3165 3166 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3167 goto out; 3168 3169 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3170 nfrags += 1 + skb_shinfo(head)->nr_frags; 3171 frag_tail = &skb_shinfo(head)->frag_list; 3172 while (*frag_tail) { 3173 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3174 frag_tail = &(*frag_tail)->next; 3175 n++; 3176 } 3177 3178 if (max_subframes && n > max_subframes) 3179 goto out; 3180 3181 if (max_frags && nfrags > max_frags) 3182 goto out; 3183 3184 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3185 &subframe_len)) 3186 goto out; 3187 3188 ret = true; 3189 data = skb_push(skb, ETH_ALEN + 2); 3190 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3191 3192 data += 2 * ETH_ALEN; 3193 len = cpu_to_be16(subframe_len); 3194 memcpy(data, &len, 2); 3195 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3196 3197 head->len += skb->len; 3198 head->data_len += skb->len; 3199 *frag_tail = skb; 3200 3201 flow->backlog += head->len - orig_len; 3202 tin->backlog_bytes += head->len - orig_len; 3203 3204 fq_recalc_backlog(fq, tin, flow); 3205 3206 out: 3207 spin_unlock_bh(&fq->lock); 3208 3209 return ret; 3210 } 3211 3212 /* 3213 * Can be called while the sta lock is held. Anything that can cause packets to 3214 * be generated will cause deadlock! 3215 */ 3216 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3217 struct sta_info *sta, u8 pn_offs, 3218 struct ieee80211_key *key, 3219 struct sk_buff *skb) 3220 { 3221 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3222 struct ieee80211_hdr *hdr = (void *)skb->data; 3223 u8 tid = IEEE80211_NUM_TIDS; 3224 3225 if (key) 3226 info->control.hw_key = &key->conf; 3227 3228 ieee80211_tx_stats(skb->dev, skb->len); 3229 3230 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3231 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3232 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3233 } else { 3234 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3235 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3236 sdata->sequence_number += 0x10; 3237 } 3238 3239 if (skb_shinfo(skb)->gso_size) 3240 sta->tx_stats.msdu[tid] += 3241 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3242 else 3243 sta->tx_stats.msdu[tid]++; 3244 3245 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3246 3247 /* statistics normally done by ieee80211_tx_h_stats (but that 3248 * has to consider fragmentation, so is more complex) 3249 */ 3250 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3251 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3252 3253 if (pn_offs) { 3254 u64 pn; 3255 u8 *crypto_hdr = skb->data + pn_offs; 3256 3257 switch (key->conf.cipher) { 3258 case WLAN_CIPHER_SUITE_CCMP: 3259 case WLAN_CIPHER_SUITE_CCMP_256: 3260 case WLAN_CIPHER_SUITE_GCMP: 3261 case WLAN_CIPHER_SUITE_GCMP_256: 3262 pn = atomic64_inc_return(&key->conf.tx_pn); 3263 crypto_hdr[0] = pn; 3264 crypto_hdr[1] = pn >> 8; 3265 crypto_hdr[4] = pn >> 16; 3266 crypto_hdr[5] = pn >> 24; 3267 crypto_hdr[6] = pn >> 32; 3268 crypto_hdr[7] = pn >> 40; 3269 break; 3270 } 3271 } 3272 } 3273 3274 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3275 struct sta_info *sta, 3276 struct ieee80211_fast_tx *fast_tx, 3277 struct sk_buff *skb) 3278 { 3279 struct ieee80211_local *local = sdata->local; 3280 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3281 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3282 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3283 struct ethhdr eth; 3284 struct ieee80211_tx_info *info; 3285 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3286 struct ieee80211_tx_data tx; 3287 ieee80211_tx_result r; 3288 struct tid_ampdu_tx *tid_tx = NULL; 3289 u8 tid = IEEE80211_NUM_TIDS; 3290 3291 /* control port protocol needs a lot of special handling */ 3292 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3293 return false; 3294 3295 /* only RFC 1042 SNAP */ 3296 if (ethertype < ETH_P_802_3_MIN) 3297 return false; 3298 3299 /* don't handle TX status request here either */ 3300 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3301 return false; 3302 3303 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3304 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3305 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3306 if (tid_tx) { 3307 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3308 return false; 3309 if (tid_tx->timeout) 3310 tid_tx->last_tx = jiffies; 3311 } 3312 } 3313 3314 /* after this point (skb is modified) we cannot return false */ 3315 3316 if (skb_shared(skb)) { 3317 struct sk_buff *tmp_skb = skb; 3318 3319 skb = skb_clone(skb, GFP_ATOMIC); 3320 kfree_skb(tmp_skb); 3321 3322 if (!skb) 3323 return true; 3324 } 3325 3326 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3327 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3328 return true; 3329 3330 /* will not be crypto-handled beyond what we do here, so use false 3331 * as the may-encrypt argument for the resize to not account for 3332 * more room than we already have in 'extra_head' 3333 */ 3334 if (unlikely(ieee80211_skb_resize(sdata, skb, 3335 max_t(int, extra_head + hw_headroom - 3336 skb_headroom(skb), 0), 3337 false))) { 3338 kfree_skb(skb); 3339 return true; 3340 } 3341 3342 memcpy(ð, skb->data, ETH_HLEN - 2); 3343 hdr = (void *)skb_push(skb, extra_head); 3344 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3345 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3346 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3347 3348 info = IEEE80211_SKB_CB(skb); 3349 memset(info, 0, sizeof(*info)); 3350 info->band = fast_tx->band; 3351 info->control.vif = &sdata->vif; 3352 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3353 IEEE80211_TX_CTL_DONTFRAG | 3354 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3355 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3356 3357 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3358 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3359 *ieee80211_get_qos_ctl(hdr) = tid; 3360 } 3361 3362 __skb_queue_head_init(&tx.skbs); 3363 3364 tx.flags = IEEE80211_TX_UNICAST; 3365 tx.local = local; 3366 tx.sdata = sdata; 3367 tx.sta = sta; 3368 tx.key = fast_tx->key; 3369 3370 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3371 tx.skb = skb; 3372 r = ieee80211_tx_h_rate_ctrl(&tx); 3373 skb = tx.skb; 3374 tx.skb = NULL; 3375 3376 if (r != TX_CONTINUE) { 3377 if (r != TX_QUEUED) 3378 kfree_skb(skb); 3379 return true; 3380 } 3381 } 3382 3383 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3384 return true; 3385 3386 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3387 fast_tx->key, skb); 3388 3389 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3390 sdata = container_of(sdata->bss, 3391 struct ieee80211_sub_if_data, u.ap); 3392 3393 __skb_queue_tail(&tx.skbs, skb); 3394 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3395 return true; 3396 } 3397 3398 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3399 struct ieee80211_txq *txq) 3400 { 3401 struct ieee80211_local *local = hw_to_local(hw); 3402 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3403 struct ieee80211_hdr *hdr; 3404 struct sk_buff *skb = NULL; 3405 struct fq *fq = &local->fq; 3406 struct fq_tin *tin = &txqi->tin; 3407 struct ieee80211_tx_info *info; 3408 struct ieee80211_tx_data tx; 3409 ieee80211_tx_result r; 3410 3411 spin_lock_bh(&fq->lock); 3412 3413 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3414 goto out; 3415 3416 /* Make sure fragments stay together. */ 3417 skb = __skb_dequeue(&txqi->frags); 3418 if (skb) 3419 goto out; 3420 3421 begin: 3422 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3423 if (!skb) 3424 goto out; 3425 3426 ieee80211_set_skb_vif(skb, txqi); 3427 3428 hdr = (struct ieee80211_hdr *)skb->data; 3429 info = IEEE80211_SKB_CB(skb); 3430 3431 memset(&tx, 0, sizeof(tx)); 3432 __skb_queue_head_init(&tx.skbs); 3433 tx.local = local; 3434 tx.skb = skb; 3435 tx.sdata = vif_to_sdata(info->control.vif); 3436 3437 if (txq->sta) 3438 tx.sta = container_of(txq->sta, struct sta_info, sta); 3439 3440 /* 3441 * The key can be removed while the packet was queued, so need to call 3442 * this here to get the current key. 3443 */ 3444 r = ieee80211_tx_h_select_key(&tx); 3445 if (r != TX_CONTINUE) { 3446 ieee80211_free_txskb(&local->hw, skb); 3447 goto begin; 3448 } 3449 3450 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3451 info->flags |= IEEE80211_TX_CTL_AMPDU; 3452 else 3453 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3454 3455 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3456 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3457 sta); 3458 u8 pn_offs = 0; 3459 3460 if (tx.key && 3461 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3462 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3463 3464 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3465 tx.key, skb); 3466 } else { 3467 if (invoke_tx_handlers_late(&tx)) 3468 goto begin; 3469 3470 skb = __skb_dequeue(&tx.skbs); 3471 3472 if (!skb_queue_empty(&tx.skbs)) 3473 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3474 } 3475 3476 if (skb && skb_has_frag_list(skb) && 3477 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3478 if (skb_linearize(skb)) { 3479 ieee80211_free_txskb(&local->hw, skb); 3480 goto begin; 3481 } 3482 } 3483 3484 out: 3485 spin_unlock_bh(&fq->lock); 3486 3487 return skb; 3488 } 3489 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3490 3491 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3492 struct net_device *dev, 3493 u32 info_flags) 3494 { 3495 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3496 struct sta_info *sta; 3497 struct sk_buff *next; 3498 3499 if (unlikely(skb->len < ETH_HLEN)) { 3500 kfree_skb(skb); 3501 return; 3502 } 3503 3504 rcu_read_lock(); 3505 3506 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3507 goto out_free; 3508 3509 if (!IS_ERR_OR_NULL(sta)) { 3510 struct ieee80211_fast_tx *fast_tx; 3511 3512 fast_tx = rcu_dereference(sta->fast_tx); 3513 3514 if (fast_tx && 3515 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3516 goto out; 3517 } 3518 3519 if (skb_is_gso(skb)) { 3520 struct sk_buff *segs; 3521 3522 segs = skb_gso_segment(skb, 0); 3523 if (IS_ERR(segs)) { 3524 goto out_free; 3525 } else if (segs) { 3526 consume_skb(skb); 3527 skb = segs; 3528 } 3529 } else { 3530 /* we cannot process non-linear frames on this path */ 3531 if (skb_linearize(skb)) { 3532 kfree_skb(skb); 3533 goto out; 3534 } 3535 3536 /* the frame could be fragmented, software-encrypted, and other 3537 * things so we cannot really handle checksum offload with it - 3538 * fix it up in software before we handle anything else. 3539 */ 3540 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3541 skb_set_transport_header(skb, 3542 skb_checksum_start_offset(skb)); 3543 if (skb_checksum_help(skb)) 3544 goto out_free; 3545 } 3546 } 3547 3548 next = skb; 3549 while (next) { 3550 skb = next; 3551 next = skb->next; 3552 3553 skb->prev = NULL; 3554 skb->next = NULL; 3555 3556 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3557 if (IS_ERR(skb)) 3558 goto out; 3559 3560 ieee80211_tx_stats(dev, skb->len); 3561 3562 ieee80211_xmit(sdata, sta, skb); 3563 } 3564 goto out; 3565 out_free: 3566 kfree_skb(skb); 3567 out: 3568 rcu_read_unlock(); 3569 } 3570 3571 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3572 { 3573 struct ethhdr *eth; 3574 int err; 3575 3576 err = skb_ensure_writable(skb, ETH_HLEN); 3577 if (unlikely(err)) 3578 return err; 3579 3580 eth = (void *)skb->data; 3581 ether_addr_copy(eth->h_dest, sta->sta.addr); 3582 3583 return 0; 3584 } 3585 3586 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3587 struct net_device *dev) 3588 { 3589 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3590 const struct ethhdr *eth = (void *)skb->data; 3591 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3592 __be16 ethertype; 3593 3594 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3595 return false; 3596 3597 switch (sdata->vif.type) { 3598 case NL80211_IFTYPE_AP_VLAN: 3599 if (sdata->u.vlan.sta) 3600 return false; 3601 if (sdata->wdev.use_4addr) 3602 return false; 3603 /* fall through */ 3604 case NL80211_IFTYPE_AP: 3605 /* check runtime toggle for this bss */ 3606 if (!sdata->bss->multicast_to_unicast) 3607 return false; 3608 break; 3609 default: 3610 return false; 3611 } 3612 3613 /* multicast to unicast conversion only for some payload */ 3614 ethertype = eth->h_proto; 3615 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3616 ethertype = ethvlan->h_vlan_encapsulated_proto; 3617 switch (ethertype) { 3618 case htons(ETH_P_ARP): 3619 case htons(ETH_P_IP): 3620 case htons(ETH_P_IPV6): 3621 break; 3622 default: 3623 return false; 3624 } 3625 3626 return true; 3627 } 3628 3629 static void 3630 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3631 struct sk_buff_head *queue) 3632 { 3633 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3634 struct ieee80211_local *local = sdata->local; 3635 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3636 struct sta_info *sta, *first = NULL; 3637 struct sk_buff *cloned_skb; 3638 3639 rcu_read_lock(); 3640 3641 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3642 if (sdata != sta->sdata) 3643 /* AP-VLAN mismatch */ 3644 continue; 3645 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3646 /* do not send back to source */ 3647 continue; 3648 if (!first) { 3649 first = sta; 3650 continue; 3651 } 3652 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3653 if (!cloned_skb) 3654 goto multicast; 3655 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3656 dev_kfree_skb(cloned_skb); 3657 goto multicast; 3658 } 3659 __skb_queue_tail(queue, cloned_skb); 3660 } 3661 3662 if (likely(first)) { 3663 if (unlikely(ieee80211_change_da(skb, first))) 3664 goto multicast; 3665 __skb_queue_tail(queue, skb); 3666 } else { 3667 /* no STA connected, drop */ 3668 kfree_skb(skb); 3669 skb = NULL; 3670 } 3671 3672 goto out; 3673 multicast: 3674 __skb_queue_purge(queue); 3675 __skb_queue_tail(queue, skb); 3676 out: 3677 rcu_read_unlock(); 3678 } 3679 3680 /** 3681 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3682 * @skb: packet to be sent 3683 * @dev: incoming interface 3684 * 3685 * On failure skb will be freed. 3686 */ 3687 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3688 struct net_device *dev) 3689 { 3690 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3691 struct sk_buff_head queue; 3692 3693 __skb_queue_head_init(&queue); 3694 ieee80211_convert_to_unicast(skb, dev, &queue); 3695 while ((skb = __skb_dequeue(&queue))) 3696 __ieee80211_subif_start_xmit(skb, dev, 0); 3697 } else { 3698 __ieee80211_subif_start_xmit(skb, dev, 0); 3699 } 3700 3701 return NETDEV_TX_OK; 3702 } 3703 3704 struct sk_buff * 3705 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3706 struct sk_buff *skb, u32 info_flags) 3707 { 3708 struct ieee80211_hdr *hdr; 3709 struct ieee80211_tx_data tx = { 3710 .local = sdata->local, 3711 .sdata = sdata, 3712 }; 3713 struct sta_info *sta; 3714 3715 rcu_read_lock(); 3716 3717 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3718 kfree_skb(skb); 3719 skb = ERR_PTR(-EINVAL); 3720 goto out; 3721 } 3722 3723 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3724 if (IS_ERR(skb)) 3725 goto out; 3726 3727 hdr = (void *)skb->data; 3728 tx.sta = sta_info_get(sdata, hdr->addr1); 3729 tx.skb = skb; 3730 3731 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3732 rcu_read_unlock(); 3733 kfree_skb(skb); 3734 return ERR_PTR(-EINVAL); 3735 } 3736 3737 out: 3738 rcu_read_unlock(); 3739 return skb; 3740 } 3741 3742 /* 3743 * ieee80211_clear_tx_pending may not be called in a context where 3744 * it is possible that it packets could come in again. 3745 */ 3746 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3747 { 3748 struct sk_buff *skb; 3749 int i; 3750 3751 for (i = 0; i < local->hw.queues; i++) { 3752 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3753 ieee80211_free_txskb(&local->hw, skb); 3754 } 3755 } 3756 3757 /* 3758 * Returns false if the frame couldn't be transmitted but was queued instead, 3759 * which in this case means re-queued -- take as an indication to stop sending 3760 * more pending frames. 3761 */ 3762 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3763 struct sk_buff *skb) 3764 { 3765 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3766 struct ieee80211_sub_if_data *sdata; 3767 struct sta_info *sta; 3768 struct ieee80211_hdr *hdr; 3769 bool result; 3770 struct ieee80211_chanctx_conf *chanctx_conf; 3771 3772 sdata = vif_to_sdata(info->control.vif); 3773 3774 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3775 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3776 if (unlikely(!chanctx_conf)) { 3777 dev_kfree_skb(skb); 3778 return true; 3779 } 3780 info->band = chanctx_conf->def.chan->band; 3781 result = ieee80211_tx(sdata, NULL, skb, true); 3782 } else { 3783 struct sk_buff_head skbs; 3784 3785 __skb_queue_head_init(&skbs); 3786 __skb_queue_tail(&skbs, skb); 3787 3788 hdr = (struct ieee80211_hdr *)skb->data; 3789 sta = sta_info_get(sdata, hdr->addr1); 3790 3791 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3792 } 3793 3794 return result; 3795 } 3796 3797 /* 3798 * Transmit all pending packets. Called from tasklet. 3799 */ 3800 void ieee80211_tx_pending(unsigned long data) 3801 { 3802 struct ieee80211_local *local = (struct ieee80211_local *)data; 3803 unsigned long flags; 3804 int i; 3805 bool txok; 3806 3807 rcu_read_lock(); 3808 3809 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3810 for (i = 0; i < local->hw.queues; i++) { 3811 /* 3812 * If queue is stopped by something other than due to pending 3813 * frames, or we have no pending frames, proceed to next queue. 3814 */ 3815 if (local->queue_stop_reasons[i] || 3816 skb_queue_empty(&local->pending[i])) 3817 continue; 3818 3819 while (!skb_queue_empty(&local->pending[i])) { 3820 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3822 3823 if (WARN_ON(!info->control.vif)) { 3824 ieee80211_free_txskb(&local->hw, skb); 3825 continue; 3826 } 3827 3828 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3829 flags); 3830 3831 txok = ieee80211_tx_pending_skb(local, skb); 3832 spin_lock_irqsave(&local->queue_stop_reason_lock, 3833 flags); 3834 if (!txok) 3835 break; 3836 } 3837 3838 if (skb_queue_empty(&local->pending[i])) 3839 ieee80211_propagate_queue_wake(local, i); 3840 } 3841 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3842 3843 rcu_read_unlock(); 3844 } 3845 3846 /* functions for drivers to get certain frames */ 3847 3848 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3849 struct ps_data *ps, struct sk_buff *skb, 3850 bool is_template) 3851 { 3852 u8 *pos, *tim; 3853 int aid0 = 0; 3854 int i, have_bits = 0, n1, n2; 3855 3856 /* Generate bitmap for TIM only if there are any STAs in power save 3857 * mode. */ 3858 if (atomic_read(&ps->num_sta_ps) > 0) 3859 /* in the hope that this is faster than 3860 * checking byte-for-byte */ 3861 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3862 IEEE80211_MAX_AID+1); 3863 if (!is_template) { 3864 if (ps->dtim_count == 0) 3865 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3866 else 3867 ps->dtim_count--; 3868 } 3869 3870 tim = pos = (u8 *) skb_put(skb, 6); 3871 *pos++ = WLAN_EID_TIM; 3872 *pos++ = 4; 3873 *pos++ = ps->dtim_count; 3874 *pos++ = sdata->vif.bss_conf.dtim_period; 3875 3876 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3877 aid0 = 1; 3878 3879 ps->dtim_bc_mc = aid0 == 1; 3880 3881 if (have_bits) { 3882 /* Find largest even number N1 so that bits numbered 1 through 3883 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3884 * (N2 + 1) x 8 through 2007 are 0. */ 3885 n1 = 0; 3886 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3887 if (ps->tim[i]) { 3888 n1 = i & 0xfe; 3889 break; 3890 } 3891 } 3892 n2 = n1; 3893 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3894 if (ps->tim[i]) { 3895 n2 = i; 3896 break; 3897 } 3898 } 3899 3900 /* Bitmap control */ 3901 *pos++ = n1 | aid0; 3902 /* Part Virt Bitmap */ 3903 skb_put(skb, n2 - n1); 3904 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3905 3906 tim[1] = n2 - n1 + 4; 3907 } else { 3908 *pos++ = aid0; /* Bitmap control */ 3909 *pos++ = 0; /* Part Virt Bitmap */ 3910 } 3911 } 3912 3913 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3914 struct ps_data *ps, struct sk_buff *skb, 3915 bool is_template) 3916 { 3917 struct ieee80211_local *local = sdata->local; 3918 3919 /* 3920 * Not very nice, but we want to allow the driver to call 3921 * ieee80211_beacon_get() as a response to the set_tim() 3922 * callback. That, however, is already invoked under the 3923 * sta_lock to guarantee consistent and race-free update 3924 * of the tim bitmap in mac80211 and the driver. 3925 */ 3926 if (local->tim_in_locked_section) { 3927 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3928 } else { 3929 spin_lock_bh(&local->tim_lock); 3930 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3931 spin_unlock_bh(&local->tim_lock); 3932 } 3933 3934 return 0; 3935 } 3936 3937 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3938 struct beacon_data *beacon) 3939 { 3940 struct probe_resp *resp; 3941 u8 *beacon_data; 3942 size_t beacon_data_len; 3943 int i; 3944 u8 count = beacon->csa_current_counter; 3945 3946 switch (sdata->vif.type) { 3947 case NL80211_IFTYPE_AP: 3948 beacon_data = beacon->tail; 3949 beacon_data_len = beacon->tail_len; 3950 break; 3951 case NL80211_IFTYPE_ADHOC: 3952 beacon_data = beacon->head; 3953 beacon_data_len = beacon->head_len; 3954 break; 3955 case NL80211_IFTYPE_MESH_POINT: 3956 beacon_data = beacon->head; 3957 beacon_data_len = beacon->head_len; 3958 break; 3959 default: 3960 return; 3961 } 3962 3963 rcu_read_lock(); 3964 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3965 resp = rcu_dereference(sdata->u.ap.probe_resp); 3966 3967 if (beacon->csa_counter_offsets[i]) { 3968 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3969 beacon_data_len)) { 3970 rcu_read_unlock(); 3971 return; 3972 } 3973 3974 beacon_data[beacon->csa_counter_offsets[i]] = count; 3975 } 3976 3977 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3978 resp->data[resp->csa_counter_offsets[i]] = count; 3979 } 3980 rcu_read_unlock(); 3981 } 3982 3983 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3984 { 3985 beacon->csa_current_counter--; 3986 3987 /* the counter should never reach 0 */ 3988 WARN_ON_ONCE(!beacon->csa_current_counter); 3989 3990 return beacon->csa_current_counter; 3991 } 3992 3993 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3994 { 3995 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3996 struct beacon_data *beacon = NULL; 3997 u8 count = 0; 3998 3999 rcu_read_lock(); 4000 4001 if (sdata->vif.type == NL80211_IFTYPE_AP) 4002 beacon = rcu_dereference(sdata->u.ap.beacon); 4003 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4004 beacon = rcu_dereference(sdata->u.ibss.presp); 4005 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4006 beacon = rcu_dereference(sdata->u.mesh.beacon); 4007 4008 if (!beacon) 4009 goto unlock; 4010 4011 count = __ieee80211_csa_update_counter(beacon); 4012 4013 unlock: 4014 rcu_read_unlock(); 4015 return count; 4016 } 4017 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4018 4019 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4020 { 4021 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4022 struct beacon_data *beacon = NULL; 4023 u8 *beacon_data; 4024 size_t beacon_data_len; 4025 int ret = false; 4026 4027 if (!ieee80211_sdata_running(sdata)) 4028 return false; 4029 4030 rcu_read_lock(); 4031 if (vif->type == NL80211_IFTYPE_AP) { 4032 struct ieee80211_if_ap *ap = &sdata->u.ap; 4033 4034 beacon = rcu_dereference(ap->beacon); 4035 if (WARN_ON(!beacon || !beacon->tail)) 4036 goto out; 4037 beacon_data = beacon->tail; 4038 beacon_data_len = beacon->tail_len; 4039 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4040 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4041 4042 beacon = rcu_dereference(ifibss->presp); 4043 if (!beacon) 4044 goto out; 4045 4046 beacon_data = beacon->head; 4047 beacon_data_len = beacon->head_len; 4048 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4049 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4050 4051 beacon = rcu_dereference(ifmsh->beacon); 4052 if (!beacon) 4053 goto out; 4054 4055 beacon_data = beacon->head; 4056 beacon_data_len = beacon->head_len; 4057 } else { 4058 WARN_ON(1); 4059 goto out; 4060 } 4061 4062 if (!beacon->csa_counter_offsets[0]) 4063 goto out; 4064 4065 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4066 goto out; 4067 4068 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4069 ret = true; 4070 out: 4071 rcu_read_unlock(); 4072 4073 return ret; 4074 } 4075 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4076 4077 static struct sk_buff * 4078 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4079 struct ieee80211_vif *vif, 4080 struct ieee80211_mutable_offsets *offs, 4081 bool is_template) 4082 { 4083 struct ieee80211_local *local = hw_to_local(hw); 4084 struct beacon_data *beacon = NULL; 4085 struct sk_buff *skb = NULL; 4086 struct ieee80211_tx_info *info; 4087 struct ieee80211_sub_if_data *sdata = NULL; 4088 enum nl80211_band band; 4089 struct ieee80211_tx_rate_control txrc; 4090 struct ieee80211_chanctx_conf *chanctx_conf; 4091 int csa_off_base = 0; 4092 4093 rcu_read_lock(); 4094 4095 sdata = vif_to_sdata(vif); 4096 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4097 4098 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4099 goto out; 4100 4101 if (offs) 4102 memset(offs, 0, sizeof(*offs)); 4103 4104 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4105 struct ieee80211_if_ap *ap = &sdata->u.ap; 4106 4107 beacon = rcu_dereference(ap->beacon); 4108 if (beacon) { 4109 if (beacon->csa_counter_offsets[0]) { 4110 if (!is_template) 4111 __ieee80211_csa_update_counter(beacon); 4112 4113 ieee80211_set_csa(sdata, beacon); 4114 } 4115 4116 /* 4117 * headroom, head length, 4118 * tail length and maximum TIM length 4119 */ 4120 skb = dev_alloc_skb(local->tx_headroom + 4121 beacon->head_len + 4122 beacon->tail_len + 256 + 4123 local->hw.extra_beacon_tailroom); 4124 if (!skb) 4125 goto out; 4126 4127 skb_reserve(skb, local->tx_headroom); 4128 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4129 beacon->head_len); 4130 4131 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4132 is_template); 4133 4134 if (offs) { 4135 offs->tim_offset = beacon->head_len; 4136 offs->tim_length = skb->len - beacon->head_len; 4137 4138 /* for AP the csa offsets are from tail */ 4139 csa_off_base = skb->len; 4140 } 4141 4142 if (beacon->tail) 4143 memcpy(skb_put(skb, beacon->tail_len), 4144 beacon->tail, beacon->tail_len); 4145 } else 4146 goto out; 4147 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4148 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4149 struct ieee80211_hdr *hdr; 4150 4151 beacon = rcu_dereference(ifibss->presp); 4152 if (!beacon) 4153 goto out; 4154 4155 if (beacon->csa_counter_offsets[0]) { 4156 if (!is_template) 4157 __ieee80211_csa_update_counter(beacon); 4158 4159 ieee80211_set_csa(sdata, beacon); 4160 } 4161 4162 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4163 local->hw.extra_beacon_tailroom); 4164 if (!skb) 4165 goto out; 4166 skb_reserve(skb, local->tx_headroom); 4167 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4168 beacon->head_len); 4169 4170 hdr = (struct ieee80211_hdr *) skb->data; 4171 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4172 IEEE80211_STYPE_BEACON); 4173 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4174 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4175 4176 beacon = rcu_dereference(ifmsh->beacon); 4177 if (!beacon) 4178 goto out; 4179 4180 if (beacon->csa_counter_offsets[0]) { 4181 if (!is_template) 4182 /* TODO: For mesh csa_counter is in TU, so 4183 * decrementing it by one isn't correct, but 4184 * for now we leave it consistent with overall 4185 * mac80211's behavior. 4186 */ 4187 __ieee80211_csa_update_counter(beacon); 4188 4189 ieee80211_set_csa(sdata, beacon); 4190 } 4191 4192 if (ifmsh->sync_ops) 4193 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4194 4195 skb = dev_alloc_skb(local->tx_headroom + 4196 beacon->head_len + 4197 256 + /* TIM IE */ 4198 beacon->tail_len + 4199 local->hw.extra_beacon_tailroom); 4200 if (!skb) 4201 goto out; 4202 skb_reserve(skb, local->tx_headroom); 4203 memcpy(skb_put(skb, beacon->head_len), beacon->head, 4204 beacon->head_len); 4205 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4206 4207 if (offs) { 4208 offs->tim_offset = beacon->head_len; 4209 offs->tim_length = skb->len - beacon->head_len; 4210 } 4211 4212 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 4213 beacon->tail_len); 4214 } else { 4215 WARN_ON(1); 4216 goto out; 4217 } 4218 4219 /* CSA offsets */ 4220 if (offs && beacon) { 4221 int i; 4222 4223 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4224 u16 csa_off = beacon->csa_counter_offsets[i]; 4225 4226 if (!csa_off) 4227 continue; 4228 4229 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4230 } 4231 } 4232 4233 band = chanctx_conf->def.chan->band; 4234 4235 info = IEEE80211_SKB_CB(skb); 4236 4237 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4238 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4239 info->band = band; 4240 4241 memset(&txrc, 0, sizeof(txrc)); 4242 txrc.hw = hw; 4243 txrc.sband = local->hw.wiphy->bands[band]; 4244 txrc.bss_conf = &sdata->vif.bss_conf; 4245 txrc.skb = skb; 4246 txrc.reported_rate.idx = -1; 4247 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4248 txrc.bss = true; 4249 rate_control_get_rate(sdata, NULL, &txrc); 4250 4251 info->control.vif = vif; 4252 4253 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4254 IEEE80211_TX_CTL_ASSIGN_SEQ | 4255 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4256 out: 4257 rcu_read_unlock(); 4258 return skb; 4259 4260 } 4261 4262 struct sk_buff * 4263 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4264 struct ieee80211_vif *vif, 4265 struct ieee80211_mutable_offsets *offs) 4266 { 4267 return __ieee80211_beacon_get(hw, vif, offs, true); 4268 } 4269 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4270 4271 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4272 struct ieee80211_vif *vif, 4273 u16 *tim_offset, u16 *tim_length) 4274 { 4275 struct ieee80211_mutable_offsets offs = {}; 4276 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4277 struct sk_buff *copy; 4278 struct ieee80211_supported_band *sband; 4279 int shift; 4280 4281 if (!bcn) 4282 return bcn; 4283 4284 if (tim_offset) 4285 *tim_offset = offs.tim_offset; 4286 4287 if (tim_length) 4288 *tim_length = offs.tim_length; 4289 4290 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4291 !hw_to_local(hw)->monitors) 4292 return bcn; 4293 4294 /* send a copy to monitor interfaces */ 4295 copy = skb_copy(bcn, GFP_ATOMIC); 4296 if (!copy) 4297 return bcn; 4298 4299 shift = ieee80211_vif_get_shift(vif); 4300 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4301 if (!sband) 4302 return bcn; 4303 4304 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4305 4306 return bcn; 4307 } 4308 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4309 4310 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4311 struct ieee80211_vif *vif) 4312 { 4313 struct ieee80211_if_ap *ap = NULL; 4314 struct sk_buff *skb = NULL; 4315 struct probe_resp *presp = NULL; 4316 struct ieee80211_hdr *hdr; 4317 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4318 4319 if (sdata->vif.type != NL80211_IFTYPE_AP) 4320 return NULL; 4321 4322 rcu_read_lock(); 4323 4324 ap = &sdata->u.ap; 4325 presp = rcu_dereference(ap->probe_resp); 4326 if (!presp) 4327 goto out; 4328 4329 skb = dev_alloc_skb(presp->len); 4330 if (!skb) 4331 goto out; 4332 4333 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4334 4335 hdr = (struct ieee80211_hdr *) skb->data; 4336 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4337 4338 out: 4339 rcu_read_unlock(); 4340 return skb; 4341 } 4342 EXPORT_SYMBOL(ieee80211_proberesp_get); 4343 4344 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4345 struct ieee80211_vif *vif) 4346 { 4347 struct ieee80211_sub_if_data *sdata; 4348 struct ieee80211_if_managed *ifmgd; 4349 struct ieee80211_pspoll *pspoll; 4350 struct ieee80211_local *local; 4351 struct sk_buff *skb; 4352 4353 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4354 return NULL; 4355 4356 sdata = vif_to_sdata(vif); 4357 ifmgd = &sdata->u.mgd; 4358 local = sdata->local; 4359 4360 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4361 if (!skb) 4362 return NULL; 4363 4364 skb_reserve(skb, local->hw.extra_tx_headroom); 4365 4366 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4367 memset(pspoll, 0, sizeof(*pspoll)); 4368 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4369 IEEE80211_STYPE_PSPOLL); 4370 pspoll->aid = cpu_to_le16(ifmgd->aid); 4371 4372 /* aid in PS-Poll has its two MSBs each set to 1 */ 4373 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4374 4375 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4376 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4377 4378 return skb; 4379 } 4380 EXPORT_SYMBOL(ieee80211_pspoll_get); 4381 4382 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4383 struct ieee80211_vif *vif) 4384 { 4385 struct ieee80211_hdr_3addr *nullfunc; 4386 struct ieee80211_sub_if_data *sdata; 4387 struct ieee80211_if_managed *ifmgd; 4388 struct ieee80211_local *local; 4389 struct sk_buff *skb; 4390 4391 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4392 return NULL; 4393 4394 sdata = vif_to_sdata(vif); 4395 ifmgd = &sdata->u.mgd; 4396 local = sdata->local; 4397 4398 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4399 if (!skb) 4400 return NULL; 4401 4402 skb_reserve(skb, local->hw.extra_tx_headroom); 4403 4404 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4405 sizeof(*nullfunc)); 4406 memset(nullfunc, 0, 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 = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4439 memset(hdr, 0, sizeof(*hdr)); 4440 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4441 IEEE80211_STYPE_PROBE_REQ); 4442 eth_broadcast_addr(hdr->addr1); 4443 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4444 eth_broadcast_addr(hdr->addr3); 4445 4446 pos = skb_put(skb, ie_ssid_len); 4447 *pos++ = WLAN_EID_SSID; 4448 *pos++ = ssid_len; 4449 if (ssid_len) 4450 memcpy(pos, ssid, ssid_len); 4451 pos += ssid_len; 4452 4453 return skb; 4454 } 4455 EXPORT_SYMBOL(ieee80211_probereq_get); 4456 4457 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4458 const void *frame, size_t frame_len, 4459 const struct ieee80211_tx_info *frame_txctl, 4460 struct ieee80211_rts *rts) 4461 { 4462 const struct ieee80211_hdr *hdr = frame; 4463 4464 rts->frame_control = 4465 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4466 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4467 frame_txctl); 4468 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4469 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4470 } 4471 EXPORT_SYMBOL(ieee80211_rts_get); 4472 4473 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4474 const void *frame, size_t frame_len, 4475 const struct ieee80211_tx_info *frame_txctl, 4476 struct ieee80211_cts *cts) 4477 { 4478 const struct ieee80211_hdr *hdr = frame; 4479 4480 cts->frame_control = 4481 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4482 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4483 frame_len, frame_txctl); 4484 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4485 } 4486 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4487 4488 struct sk_buff * 4489 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4490 struct ieee80211_vif *vif) 4491 { 4492 struct ieee80211_local *local = hw_to_local(hw); 4493 struct sk_buff *skb = NULL; 4494 struct ieee80211_tx_data tx; 4495 struct ieee80211_sub_if_data *sdata; 4496 struct ps_data *ps; 4497 struct ieee80211_tx_info *info; 4498 struct ieee80211_chanctx_conf *chanctx_conf; 4499 4500 sdata = vif_to_sdata(vif); 4501 4502 rcu_read_lock(); 4503 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4504 4505 if (!chanctx_conf) 4506 goto out; 4507 4508 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4509 struct beacon_data *beacon = 4510 rcu_dereference(sdata->u.ap.beacon); 4511 4512 if (!beacon || !beacon->head) 4513 goto out; 4514 4515 ps = &sdata->u.ap.ps; 4516 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4517 ps = &sdata->u.mesh.ps; 4518 } else { 4519 goto out; 4520 } 4521 4522 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4523 goto out; /* send buffered bc/mc only after DTIM beacon */ 4524 4525 while (1) { 4526 skb = skb_dequeue(&ps->bc_buf); 4527 if (!skb) 4528 goto out; 4529 local->total_ps_buffered--; 4530 4531 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4532 struct ieee80211_hdr *hdr = 4533 (struct ieee80211_hdr *) skb->data; 4534 /* more buffered multicast/broadcast frames ==> set 4535 * MoreData flag in IEEE 802.11 header to inform PS 4536 * STAs */ 4537 hdr->frame_control |= 4538 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4539 } 4540 4541 if (sdata->vif.type == NL80211_IFTYPE_AP) 4542 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4543 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4544 break; 4545 ieee80211_free_txskb(hw, skb); 4546 } 4547 4548 info = IEEE80211_SKB_CB(skb); 4549 4550 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4551 info->band = chanctx_conf->def.chan->band; 4552 4553 if (invoke_tx_handlers(&tx)) 4554 skb = NULL; 4555 out: 4556 rcu_read_unlock(); 4557 4558 return skb; 4559 } 4560 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4561 4562 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4563 { 4564 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4565 struct ieee80211_sub_if_data *sdata = sta->sdata; 4566 struct ieee80211_local *local = sdata->local; 4567 int ret; 4568 u32 queues; 4569 4570 lockdep_assert_held(&local->sta_mtx); 4571 4572 /* only some cases are supported right now */ 4573 switch (sdata->vif.type) { 4574 case NL80211_IFTYPE_STATION: 4575 case NL80211_IFTYPE_AP: 4576 case NL80211_IFTYPE_AP_VLAN: 4577 break; 4578 default: 4579 WARN_ON(1); 4580 return -EINVAL; 4581 } 4582 4583 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4584 return -EINVAL; 4585 4586 if (sta->reserved_tid == tid) { 4587 ret = 0; 4588 goto out; 4589 } 4590 4591 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4592 sdata_err(sdata, "TID reservation already active\n"); 4593 ret = -EALREADY; 4594 goto out; 4595 } 4596 4597 ieee80211_stop_vif_queues(sdata->local, sdata, 4598 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4599 4600 synchronize_net(); 4601 4602 /* Tear down BA sessions so we stop aggregating on this TID */ 4603 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4604 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4605 __ieee80211_stop_tx_ba_session(sta, tid, 4606 AGG_STOP_LOCAL_REQUEST); 4607 } 4608 4609 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4610 __ieee80211_flush_queues(local, sdata, queues, false); 4611 4612 sta->reserved_tid = tid; 4613 4614 ieee80211_wake_vif_queues(local, sdata, 4615 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4616 4617 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4618 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4619 4620 ret = 0; 4621 out: 4622 return ret; 4623 } 4624 EXPORT_SYMBOL(ieee80211_reserve_tid); 4625 4626 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4627 { 4628 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4629 struct ieee80211_sub_if_data *sdata = sta->sdata; 4630 4631 lockdep_assert_held(&sdata->local->sta_mtx); 4632 4633 /* only some cases are supported right now */ 4634 switch (sdata->vif.type) { 4635 case NL80211_IFTYPE_STATION: 4636 case NL80211_IFTYPE_AP: 4637 case NL80211_IFTYPE_AP_VLAN: 4638 break; 4639 default: 4640 WARN_ON(1); 4641 return; 4642 } 4643 4644 if (tid != sta->reserved_tid) { 4645 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4646 return; 4647 } 4648 4649 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4650 } 4651 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4652 4653 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4654 struct sk_buff *skb, int tid, 4655 enum nl80211_band band) 4656 { 4657 int ac = ieee80211_ac_from_tid(tid); 4658 4659 skb_reset_mac_header(skb); 4660 skb_set_queue_mapping(skb, ac); 4661 skb->priority = tid; 4662 4663 skb->dev = sdata->dev; 4664 4665 /* 4666 * The other path calling ieee80211_xmit is from the tasklet, 4667 * and while we can handle concurrent transmissions locking 4668 * requirements are that we do not come into tx with bhs on. 4669 */ 4670 local_bh_disable(); 4671 IEEE80211_SKB_CB(skb)->band = band; 4672 ieee80211_xmit(sdata, NULL, skb); 4673 local_bh_enable(); 4674 } 4675