1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "led.h" 32 #include "mesh.h" 33 #include "wep.h" 34 #include "wpa.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 /* misc utils */ 39 40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 41 { 42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 43 44 u64_stats_update_begin(&tstats->syncp); 45 tstats->tx_packets++; 46 tstats->tx_bytes += len; 47 u64_stats_update_end(&tstats->syncp); 48 } 49 50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 51 struct sk_buff *skb, int group_addr, 52 int next_frag_len) 53 { 54 int rate, mrate, erp, dur, i, shift = 0; 55 struct ieee80211_rate *txrate; 56 struct ieee80211_local *local = tx->local; 57 struct ieee80211_supported_band *sband; 58 struct ieee80211_hdr *hdr; 59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 60 struct ieee80211_chanctx_conf *chanctx_conf; 61 u32 rate_flags = 0; 62 63 rcu_read_lock(); 64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 65 if (chanctx_conf) { 66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 68 } 69 rcu_read_unlock(); 70 71 /* assume HW handles this */ 72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 73 return 0; 74 75 /* uh huh? */ 76 if (WARN_ON_ONCE(tx->rate.idx < 0)) 77 return 0; 78 79 sband = local->hw.wiphy->bands[info->band]; 80 txrate = &sband->bitrates[tx->rate.idx]; 81 82 erp = txrate->flags & IEEE80211_RATE_ERP_G; 83 84 /* 85 * data and mgmt (except PS Poll): 86 * - during CFP: 32768 87 * - during contention period: 88 * if addr1 is group address: 0 89 * if more fragments = 0 and addr1 is individual address: time to 90 * transmit one ACK plus SIFS 91 * if more fragments = 1 and addr1 is individual address: time to 92 * transmit next fragment plus 2 x ACK plus 3 x SIFS 93 * 94 * IEEE 802.11, 9.6: 95 * - control response frame (CTS or ACK) shall be transmitted using the 96 * same rate as the immediately previous frame in the frame exchange 97 * sequence, if this rate belongs to the PHY mandatory rates, or else 98 * at the highest possible rate belonging to the PHY rates in the 99 * BSSBasicRateSet 100 */ 101 hdr = (struct ieee80211_hdr *)skb->data; 102 if (ieee80211_is_ctl(hdr->frame_control)) { 103 /* TODO: These control frames are not currently sent by 104 * mac80211, but should they be implemented, this function 105 * needs to be updated to support duration field calculation. 106 * 107 * RTS: time needed to transmit pending data/mgmt frame plus 108 * one CTS frame plus one ACK frame plus 3 x SIFS 109 * CTS: duration of immediately previous RTS minus time 110 * required to transmit CTS and its SIFS 111 * ACK: 0 if immediately previous directed data/mgmt had 112 * more=0, with more=1 duration in ACK frame is duration 113 * from previous frame minus time needed to transmit ACK 114 * and its SIFS 115 * PS Poll: BIT(15) | BIT(14) | aid 116 */ 117 return 0; 118 } 119 120 /* data/mgmt */ 121 if (0 /* FIX: data/mgmt during CFP */) 122 return cpu_to_le16(32768); 123 124 if (group_addr) /* Group address as the destination - no ACK */ 125 return 0; 126 127 /* Individual destination address: 128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 129 * CTS and ACK frames shall be transmitted using the highest rate in 130 * basic rate set that is less than or equal to the rate of the 131 * immediately previous frame and that is using the same modulation 132 * (CCK or OFDM). If no basic rate set matches with these requirements, 133 * the highest mandatory rate of the PHY that is less than or equal to 134 * the rate of the previous frame is used. 135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 136 */ 137 rate = -1; 138 /* use lowest available if everything fails */ 139 mrate = sband->bitrates[0].bitrate; 140 for (i = 0; i < sband->n_bitrates; i++) { 141 struct ieee80211_rate *r = &sband->bitrates[i]; 142 143 if (r->bitrate > txrate->bitrate) 144 break; 145 146 if ((rate_flags & r->flags) != rate_flags) 147 continue; 148 149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 151 152 switch (sband->band) { 153 case IEEE80211_BAND_2GHZ: { 154 u32 flag; 155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 156 flag = IEEE80211_RATE_MANDATORY_G; 157 else 158 flag = IEEE80211_RATE_MANDATORY_B; 159 if (r->flags & flag) 160 mrate = r->bitrate; 161 break; 162 } 163 case IEEE80211_BAND_5GHZ: 164 if (r->flags & IEEE80211_RATE_MANDATORY_A) 165 mrate = r->bitrate; 166 break; 167 case IEEE80211_BAND_60GHZ: 168 /* TODO, for now fall through */ 169 case IEEE80211_NUM_BANDS: 170 WARN_ON(1); 171 break; 172 } 173 } 174 if (rate == -1) { 175 /* No matching basic rate found; use highest suitable mandatory 176 * PHY rate */ 177 rate = DIV_ROUND_UP(mrate, 1 << shift); 178 } 179 180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 181 if (ieee80211_is_data_qos(hdr->frame_control) && 182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 183 dur = 0; 184 else 185 /* Time needed to transmit ACK 186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 187 * to closest integer */ 188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 192 if (next_frag_len) { 193 /* Frame is fragmented: duration increases with time needed to 194 * transmit next fragment plus ACK and 2 x SIFS. */ 195 dur *= 2; /* ACK + SIFS */ 196 /* next fragment */ 197 dur += ieee80211_frame_duration(sband->band, next_frag_len, 198 txrate->bitrate, erp, 199 tx->sdata->vif.bss_conf.use_short_preamble, 200 shift); 201 } 202 203 return cpu_to_le16(dur); 204 } 205 206 /* tx handlers */ 207 static ieee80211_tx_result debug_noinline 208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 209 { 210 struct ieee80211_local *local = tx->local; 211 struct ieee80211_if_managed *ifmgd; 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 ifmgd = &tx->sdata->u.mgd; 241 242 /* 243 * Don't wakeup from power save if u-apsd is enabled, voip ac has 244 * u-apsd enabled and the frame is in voip class. This effectively 245 * means that even if all access categories have u-apsd enabled, in 246 * practise u-apsd is only used with the voip ac. This is a 247 * workaround for the case when received voip class packets do not 248 * have correct qos tag for some reason, due the network or the 249 * peer application. 250 * 251 * Note: ifmgd->uapsd_queues access is racy here. If the value is 252 * changed via debugfs, user needs to reassociate manually to have 253 * everything in sync. 254 */ 255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 258 return TX_CONTINUE; 259 260 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 261 ieee80211_stop_queues_by_reason(&local->hw, 262 IEEE80211_MAX_QUEUE_MAP, 263 IEEE80211_QUEUE_STOP_REASON_PS, 264 false); 265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 266 ieee80211_queue_work(&local->hw, 267 &local->dynamic_ps_disable_work); 268 } 269 270 /* Don't restart the timer if we're not disassociated */ 271 if (!ifmgd->associated) 272 return TX_CONTINUE; 273 274 mod_timer(&local->dynamic_ps_timer, jiffies + 275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 276 277 return TX_CONTINUE; 278 } 279 280 static ieee80211_tx_result debug_noinline 281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 282 { 283 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 286 bool assoc = false; 287 288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 289 return TX_CONTINUE; 290 291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 293 !ieee80211_is_probe_req(hdr->frame_control) && 294 !ieee80211_is_nullfunc(hdr->frame_control)) 295 /* 296 * When software scanning only nullfunc frames (to notify 297 * the sleep state to the AP) and probe requests (for the 298 * active scan) are allowed, all other frames should not be 299 * sent and we should not get here, but if we do 300 * nonetheless, drop them to avoid sending them 301 * off-channel. See the link below and 302 * ieee80211_start_scan() for more. 303 * 304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 305 */ 306 return TX_DROP; 307 308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 309 return TX_CONTINUE; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 332 ieee80211_is_data(hdr->frame_control) && 333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 334 /* 335 * No associated STAs - no need to send multicast 336 * frames. 337 */ 338 return TX_DROP; 339 } 340 341 return TX_CONTINUE; 342 } 343 344 /* This function is called whenever the AP is about to exceed the maximum limit 345 * of buffered frames for power saving STAs. This situation should not really 346 * happen often during normal operation, so dropping the oldest buffered packet 347 * from each queue should be OK to make some room for new frames. */ 348 static void purge_old_ps_buffers(struct ieee80211_local *local) 349 { 350 int total = 0, purged = 0; 351 struct sk_buff *skb; 352 struct ieee80211_sub_if_data *sdata; 353 struct sta_info *sta; 354 355 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 356 struct ps_data *ps; 357 358 if (sdata->vif.type == NL80211_IFTYPE_AP) 359 ps = &sdata->u.ap.ps; 360 else if (ieee80211_vif_is_mesh(&sdata->vif)) 361 ps = &sdata->u.mesh.ps; 362 else 363 continue; 364 365 skb = skb_dequeue(&ps->bc_buf); 366 if (skb) { 367 purged++; 368 dev_kfree_skb(skb); 369 } 370 total += skb_queue_len(&ps->bc_buf); 371 } 372 373 /* 374 * Drop one frame from each station from the lowest-priority 375 * AC that has frames at all. 376 */ 377 list_for_each_entry_rcu(sta, &local->sta_list, list) { 378 int ac; 379 380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 381 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 382 total += skb_queue_len(&sta->ps_tx_buf[ac]); 383 if (skb) { 384 purged++; 385 ieee80211_free_txskb(&local->hw, skb); 386 break; 387 } 388 } 389 } 390 391 local->total_ps_buffered = total; 392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 393 } 394 395 static ieee80211_tx_result 396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 397 { 398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 400 struct ps_data *ps; 401 402 /* 403 * broadcast/multicast frame 404 * 405 * If any of the associated/peer stations is in power save mode, 406 * the frame is buffered to be sent after DTIM beacon frame. 407 * This is done either by the hardware or us. 408 */ 409 410 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 413 if (!tx->sdata->bss) 414 return TX_CONTINUE; 415 416 ps = &tx->sdata->bss->ps; 417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 418 ps = &tx->sdata->u.mesh.ps; 419 } else { 420 return TX_CONTINUE; 421 } 422 423 424 /* no buffering for ordered frames */ 425 if (ieee80211_has_order(hdr->frame_control)) 426 return TX_CONTINUE; 427 428 if (ieee80211_is_probe_req(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 432 info->hw_queue = tx->sdata->vif.cab_queue; 433 434 /* no stations in PS mode */ 435 if (!atomic_read(&ps->num_sta_ps)) 436 return TX_CONTINUE; 437 438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 439 440 /* device releases frame after DTIM beacon */ 441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 442 return TX_CONTINUE; 443 444 /* buffered in mac80211 */ 445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 446 purge_old_ps_buffers(tx->local); 447 448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 449 ps_dbg(tx->sdata, 450 "BC TX buffer full - dropping the oldest frame\n"); 451 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 452 } else 453 tx->local->total_ps_buffered++; 454 455 skb_queue_tail(&ps->bc_buf, tx->skb); 456 457 return TX_QUEUED; 458 } 459 460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 461 struct sk_buff *skb) 462 { 463 if (!ieee80211_is_mgmt(fc)) 464 return 0; 465 466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 467 return 0; 468 469 if (!ieee80211_is_robust_mgmt_frame(skb)) 470 return 0; 471 472 return 1; 473 } 474 475 static ieee80211_tx_result 476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 477 { 478 struct sta_info *sta = tx->sta; 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 481 struct ieee80211_local *local = tx->local; 482 483 if (unlikely(!sta)) 484 return TX_CONTINUE; 485 486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 490 int ac = skb_get_queue_mapping(tx->skb); 491 492 if (ieee80211_is_mgmt(hdr->frame_control) && 493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 495 return TX_CONTINUE; 496 } 497 498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 499 sta->sta.addr, sta->sta.aid, ac); 500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 501 purge_old_ps_buffers(tx->local); 502 503 /* sync with ieee80211_sta_ps_deliver_wakeup */ 504 spin_lock(&sta->ps_lock); 505 /* 506 * STA woke up the meantime and all the frames on ps_tx_buf have 507 * been queued to pending queue. No reordering can happen, go 508 * ahead and Tx the packet. 509 */ 510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 513 spin_unlock(&sta->ps_lock); 514 return TX_CONTINUE; 515 } 516 517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 519 ps_dbg(tx->sdata, 520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 521 sta->sta.addr, ac); 522 ieee80211_free_txskb(&local->hw, old); 523 } else 524 tx->local->total_ps_buffered++; 525 526 info->control.jiffies = jiffies; 527 info->control.vif = &tx->sdata->vif; 528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 531 spin_unlock(&sta->ps_lock); 532 533 if (!timer_pending(&local->sta_cleanup)) 534 mod_timer(&local->sta_cleanup, 535 round_jiffies(jiffies + 536 STA_INFO_CLEANUP_INTERVAL)); 537 538 /* 539 * We queued up some frames, so the TIM bit might 540 * need to be set, recalculate it. 541 */ 542 sta_info_recalc_tim(sta); 543 544 return TX_QUEUED; 545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 546 ps_dbg(tx->sdata, 547 "STA %pM in PS mode, but polling/in SP -> send frame\n", 548 sta->sta.addr); 549 } 550 551 return TX_CONTINUE; 552 } 553 554 static ieee80211_tx_result debug_noinline 555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 556 { 557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 558 return TX_CONTINUE; 559 560 if (tx->flags & IEEE80211_TX_UNICAST) 561 return ieee80211_tx_h_unicast_ps_buf(tx); 562 else 563 return ieee80211_tx_h_multicast_ps_buf(tx); 564 } 565 566 static ieee80211_tx_result debug_noinline 567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 568 { 569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 570 571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 572 if (tx->sdata->control_port_no_encrypt) 573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 576 } 577 578 return TX_CONTINUE; 579 } 580 581 static ieee80211_tx_result debug_noinline 582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 583 { 584 struct ieee80211_key *key; 585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 587 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 589 tx->key = NULL; 590 else if (tx->sta && 591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 592 tx->key = key; 593 else if (ieee80211_is_mgmt(hdr->frame_control) && 594 is_multicast_ether_addr(hdr->addr1) && 595 ieee80211_is_robust_mgmt_frame(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 597 tx->key = key; 598 else if (is_multicast_ether_addr(hdr->addr1) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (!is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_unicast_key))) 603 tx->key = key; 604 else 605 tx->key = NULL; 606 607 if (tx->key) { 608 bool skip_hw = false; 609 610 /* TODO: add threshold stuff again */ 611 612 switch (tx->key->conf.cipher) { 613 case WLAN_CIPHER_SUITE_WEP40: 614 case WLAN_CIPHER_SUITE_WEP104: 615 case WLAN_CIPHER_SUITE_TKIP: 616 if (!ieee80211_is_data_present(hdr->frame_control)) 617 tx->key = NULL; 618 break; 619 case WLAN_CIPHER_SUITE_CCMP: 620 case WLAN_CIPHER_SUITE_CCMP_256: 621 case WLAN_CIPHER_SUITE_GCMP: 622 case WLAN_CIPHER_SUITE_GCMP_256: 623 if (!ieee80211_is_data_present(hdr->frame_control) && 624 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 625 tx->skb)) 626 tx->key = NULL; 627 else 628 skip_hw = (tx->key->conf.flags & 629 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 630 ieee80211_is_mgmt(hdr->frame_control); 631 break; 632 case WLAN_CIPHER_SUITE_AES_CMAC: 633 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 634 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 635 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 636 if (!ieee80211_is_mgmt(hdr->frame_control)) 637 tx->key = NULL; 638 break; 639 } 640 641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 642 !ieee80211_is_deauth(hdr->frame_control))) 643 return TX_DROP; 644 645 if (!skip_hw && tx->key && 646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 647 info->control.hw_key = &tx->key->conf; 648 } 649 650 return TX_CONTINUE; 651 } 652 653 static ieee80211_tx_result debug_noinline 654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 655 { 656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 657 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 658 struct ieee80211_supported_band *sband; 659 u32 len; 660 struct ieee80211_tx_rate_control txrc; 661 struct ieee80211_sta_rates *ratetbl = NULL; 662 bool assoc = false; 663 664 memset(&txrc, 0, sizeof(txrc)); 665 666 sband = tx->local->hw.wiphy->bands[info->band]; 667 668 len = min_t(u32, tx->skb->len + FCS_LEN, 669 tx->local->hw.wiphy->frag_threshold); 670 671 /* set up the tx rate control struct we give the RC algo */ 672 txrc.hw = &tx->local->hw; 673 txrc.sband = sband; 674 txrc.bss_conf = &tx->sdata->vif.bss_conf; 675 txrc.skb = tx->skb; 676 txrc.reported_rate.idx = -1; 677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 679 txrc.max_rate_idx = -1; 680 else 681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 682 683 if (tx->sdata->rc_has_mcs_mask[info->band]) 684 txrc.rate_idx_mcs_mask = 685 tx->sdata->rc_rateidx_mcs_mask[info->band]; 686 687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 690 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 691 692 /* set up RTS protection if desired */ 693 if (len > tx->local->hw.wiphy->rts_threshold) { 694 txrc.rts = true; 695 } 696 697 info->control.use_rts = txrc.rts; 698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 699 700 /* 701 * Use short preamble if the BSS can handle it, but not for 702 * management frames unless we know the receiver can handle 703 * that -- the management frame might be to a station that 704 * just wants a probe response. 705 */ 706 if (tx->sdata->vif.bss_conf.use_short_preamble && 707 (ieee80211_is_data(hdr->frame_control) || 708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 709 txrc.short_preamble = true; 710 711 info->control.short_preamble = txrc.short_preamble; 712 713 /* don't ask rate control when rate already injected via radiotap */ 714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 715 return TX_CONTINUE; 716 717 if (tx->sta) 718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 719 720 /* 721 * Lets not bother rate control if we're associated and cannot 722 * talk to the sta. This should not happen. 723 */ 724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 725 !rate_usable_index_exists(sband, &tx->sta->sta), 726 "%s: Dropped data frame as no usable bitrate found while " 727 "scanning and associated. Target station: " 728 "%pM on %d GHz band\n", 729 tx->sdata->name, hdr->addr1, 730 info->band ? 5 : 2)) 731 return TX_DROP; 732 733 /* 734 * If we're associated with the sta at this point we know we can at 735 * least send the frame at the lowest bit rate. 736 */ 737 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 738 739 if (tx->sta && !info->control.skip_table) 740 ratetbl = rcu_dereference(tx->sta->sta.rates); 741 742 if (unlikely(info->control.rates[0].idx < 0)) { 743 if (ratetbl) { 744 struct ieee80211_tx_rate rate = { 745 .idx = ratetbl->rate[0].idx, 746 .flags = ratetbl->rate[0].flags, 747 .count = ratetbl->rate[0].count 748 }; 749 750 if (ratetbl->rate[0].idx < 0) 751 return TX_DROP; 752 753 tx->rate = rate; 754 } else { 755 return TX_DROP; 756 } 757 } else { 758 tx->rate = info->control.rates[0]; 759 } 760 761 if (txrc.reported_rate.idx < 0) { 762 txrc.reported_rate = tx->rate; 763 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 764 tx->sta->tx_stats.last_rate = txrc.reported_rate; 765 } else if (tx->sta) 766 tx->sta->tx_stats.last_rate = txrc.reported_rate; 767 768 if (ratetbl) 769 return TX_CONTINUE; 770 771 if (unlikely(!info->control.rates[0].count)) 772 info->control.rates[0].count = 1; 773 774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 775 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 776 info->control.rates[0].count = 1; 777 778 return TX_CONTINUE; 779 } 780 781 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 782 { 783 u16 *seq = &sta->tid_seq[tid]; 784 __le16 ret = cpu_to_le16(*seq); 785 786 /* Increase the sequence number. */ 787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 788 789 return ret; 790 } 791 792 static ieee80211_tx_result debug_noinline 793 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 794 { 795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 797 u8 *qc; 798 int tid; 799 800 /* 801 * Packet injection may want to control the sequence 802 * number, if we have no matching interface then we 803 * neither assign one ourselves nor ask the driver to. 804 */ 805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 806 return TX_CONTINUE; 807 808 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 809 return TX_CONTINUE; 810 811 if (ieee80211_hdrlen(hdr->frame_control) < 24) 812 return TX_CONTINUE; 813 814 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 815 return TX_CONTINUE; 816 817 /* 818 * Anything but QoS data that has a sequence number field 819 * (is long enough) gets a sequence number from the global 820 * counter. QoS data frames with a multicast destination 821 * also use the global counter (802.11-2012 9.3.2.10). 822 */ 823 if (!ieee80211_is_data_qos(hdr->frame_control) || 824 is_multicast_ether_addr(hdr->addr1)) { 825 /* driver should assign sequence number */ 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 827 /* for pure STA mode without beacons, we can do it */ 828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 829 tx->sdata->sequence_number += 0x10; 830 if (tx->sta) 831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 832 return TX_CONTINUE; 833 } 834 835 /* 836 * This should be true for injected/management frames only, for 837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 838 * above since they are not QoS-data frames. 839 */ 840 if (!tx->sta) 841 return TX_CONTINUE; 842 843 /* include per-STA, per-TID sequence counter */ 844 845 qc = ieee80211_get_qos_ctl(hdr); 846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 847 tx->sta->tx_stats.msdu[tid]++; 848 849 if (!tx->sta->sta.txq[0]) 850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 851 852 return TX_CONTINUE; 853 } 854 855 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 856 struct sk_buff *skb, int hdrlen, 857 int frag_threshold) 858 { 859 struct ieee80211_local *local = tx->local; 860 struct ieee80211_tx_info *info; 861 struct sk_buff *tmp; 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 863 int pos = hdrlen + per_fragm; 864 int rem = skb->len - hdrlen - per_fragm; 865 866 if (WARN_ON(rem < 0)) 867 return -EINVAL; 868 869 /* first fragment was already added to queue by caller */ 870 871 while (rem) { 872 int fraglen = per_fragm; 873 874 if (fraglen > rem) 875 fraglen = rem; 876 rem -= fraglen; 877 tmp = dev_alloc_skb(local->tx_headroom + 878 frag_threshold + 879 tx->sdata->encrypt_headroom + 880 IEEE80211_ENCRYPT_TAILROOM); 881 if (!tmp) 882 return -ENOMEM; 883 884 __skb_queue_tail(&tx->skbs, tmp); 885 886 skb_reserve(tmp, 887 local->tx_headroom + tx->sdata->encrypt_headroom); 888 889 /* copy control information */ 890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 891 892 info = IEEE80211_SKB_CB(tmp); 893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 894 IEEE80211_TX_CTL_FIRST_FRAGMENT); 895 896 if (rem) 897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 898 899 skb_copy_queue_mapping(tmp, skb); 900 tmp->priority = skb->priority; 901 tmp->dev = skb->dev; 902 903 /* copy header and data */ 904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 906 907 pos += fraglen; 908 } 909 910 /* adjust first fragment's length */ 911 skb_trim(skb, hdrlen + per_fragm); 912 return 0; 913 } 914 915 static ieee80211_tx_result debug_noinline 916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 917 { 918 struct sk_buff *skb = tx->skb; 919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 920 struct ieee80211_hdr *hdr = (void *)skb->data; 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 922 int hdrlen; 923 int fragnum; 924 925 /* no matter what happens, tx->skb moves to tx->skbs */ 926 __skb_queue_tail(&tx->skbs, skb); 927 tx->skb = NULL; 928 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 930 return TX_CONTINUE; 931 932 if (tx->local->ops->set_frag_threshold) 933 return TX_CONTINUE; 934 935 /* 936 * Warn when submitting a fragmented A-MPDU frame and drop it. 937 * This scenario is handled in ieee80211_tx_prepare but extra 938 * caution taken here as fragmented ampdu may cause Tx stop. 939 */ 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 941 return TX_DROP; 942 943 hdrlen = ieee80211_hdrlen(hdr->frame_control); 944 945 /* internal error, why isn't DONTFRAG set? */ 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 947 return TX_DROP; 948 949 /* 950 * Now fragment the frame. This will allocate all the fragments and 951 * chain them (using skb as the first fragment) to skb->next. 952 * During transmission, we will remove the successfully transmitted 953 * fragments from this list. When the low-level driver rejects one 954 * of the fragments then we will simply pretend to accept the skb 955 * but store it away as pending. 956 */ 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 958 return TX_DROP; 959 960 /* update duration/seq/flags of fragments */ 961 fragnum = 0; 962 963 skb_queue_walk(&tx->skbs, skb) { 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 965 966 hdr = (void *)skb->data; 967 info = IEEE80211_SKB_CB(skb); 968 969 if (!skb_queue_is_last(&tx->skbs, skb)) { 970 hdr->frame_control |= morefrags; 971 /* 972 * No multi-rate retries for fragmented frames, that 973 * would completely throw off the NAV at other STAs. 974 */ 975 info->control.rates[1].idx = -1; 976 info->control.rates[2].idx = -1; 977 info->control.rates[3].idx = -1; 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 980 } else { 981 hdr->frame_control &= ~morefrags; 982 } 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 984 fragnum++; 985 } 986 987 return TX_CONTINUE; 988 } 989 990 static ieee80211_tx_result debug_noinline 991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 992 { 993 struct sk_buff *skb; 994 int ac = -1; 995 996 if (!tx->sta) 997 return TX_CONTINUE; 998 999 skb_queue_walk(&tx->skbs, skb) { 1000 ac = skb_get_queue_mapping(skb); 1001 tx->sta->tx_stats.bytes[ac] += skb->len; 1002 } 1003 if (ac >= 0) 1004 tx->sta->tx_stats.packets[ac]++; 1005 1006 return TX_CONTINUE; 1007 } 1008 1009 static ieee80211_tx_result debug_noinline 1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1011 { 1012 if (!tx->key) 1013 return TX_CONTINUE; 1014 1015 switch (tx->key->conf.cipher) { 1016 case WLAN_CIPHER_SUITE_WEP40: 1017 case WLAN_CIPHER_SUITE_WEP104: 1018 return ieee80211_crypto_wep_encrypt(tx); 1019 case WLAN_CIPHER_SUITE_TKIP: 1020 return ieee80211_crypto_tkip_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_CCMP: 1022 return ieee80211_crypto_ccmp_encrypt( 1023 tx, IEEE80211_CCMP_MIC_LEN); 1024 case WLAN_CIPHER_SUITE_CCMP_256: 1025 return ieee80211_crypto_ccmp_encrypt( 1026 tx, IEEE80211_CCMP_256_MIC_LEN); 1027 case WLAN_CIPHER_SUITE_AES_CMAC: 1028 return ieee80211_crypto_aes_cmac_encrypt(tx); 1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1033 return ieee80211_crypto_aes_gmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_GCMP: 1035 case WLAN_CIPHER_SUITE_GCMP_256: 1036 return ieee80211_crypto_gcmp_encrypt(tx); 1037 default: 1038 return ieee80211_crypto_hw_encrypt(tx); 1039 } 1040 1041 return TX_DROP; 1042 } 1043 1044 static ieee80211_tx_result debug_noinline 1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1046 { 1047 struct sk_buff *skb; 1048 struct ieee80211_hdr *hdr; 1049 int next_len; 1050 bool group_addr; 1051 1052 skb_queue_walk(&tx->skbs, skb) { 1053 hdr = (void *) skb->data; 1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1055 break; /* must not overwrite AID */ 1056 if (!skb_queue_is_last(&tx->skbs, skb)) { 1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1058 next_len = next->len; 1059 } else 1060 next_len = 0; 1061 group_addr = is_multicast_ether_addr(hdr->addr1); 1062 1063 hdr->duration_id = 1064 ieee80211_duration(tx, skb, group_addr, next_len); 1065 } 1066 1067 return TX_CONTINUE; 1068 } 1069 1070 /* actual transmit path */ 1071 1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1073 struct sk_buff *skb, 1074 struct ieee80211_tx_info *info, 1075 struct tid_ampdu_tx *tid_tx, 1076 int tid) 1077 { 1078 bool queued = false; 1079 bool reset_agg_timer = false; 1080 struct sk_buff *purge_skb = NULL; 1081 1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1083 info->flags |= IEEE80211_TX_CTL_AMPDU; 1084 reset_agg_timer = true; 1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1086 /* 1087 * nothing -- this aggregation session is being started 1088 * but that might still fail with the driver 1089 */ 1090 } else if (!tx->sta->sta.txq[tid]) { 1091 spin_lock(&tx->sta->lock); 1092 /* 1093 * Need to re-check now, because we may get here 1094 * 1095 * 1) in the window during which the setup is actually 1096 * already done, but not marked yet because not all 1097 * packets are spliced over to the driver pending 1098 * queue yet -- if this happened we acquire the lock 1099 * either before or after the splice happens, but 1100 * need to recheck which of these cases happened. 1101 * 1102 * 2) during session teardown, if the OPERATIONAL bit 1103 * was cleared due to the teardown but the pointer 1104 * hasn't been assigned NULL yet (or we loaded it 1105 * before it was assigned) -- in this case it may 1106 * now be NULL which means we should just let the 1107 * packet pass through because splicing the frames 1108 * back is already done. 1109 */ 1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1111 1112 if (!tid_tx) { 1113 /* do nothing, let packet pass through */ 1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1115 info->flags |= IEEE80211_TX_CTL_AMPDU; 1116 reset_agg_timer = true; 1117 } else { 1118 queued = true; 1119 info->control.vif = &tx->sdata->vif; 1120 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1121 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS | 1122 IEEE80211_TX_CTL_NO_PS_BUFFER | 1123 IEEE80211_TX_STATUS_EOSP; 1124 __skb_queue_tail(&tid_tx->pending, skb); 1125 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1126 purge_skb = __skb_dequeue(&tid_tx->pending); 1127 } 1128 spin_unlock(&tx->sta->lock); 1129 1130 if (purge_skb) 1131 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1132 } 1133 1134 /* reset session timer */ 1135 if (reset_agg_timer && tid_tx->timeout) 1136 tid_tx->last_tx = jiffies; 1137 1138 return queued; 1139 } 1140 1141 /* 1142 * initialises @tx 1143 * pass %NULL for the station if unknown, a valid pointer if known 1144 * or an ERR_PTR() if the station is known not to exist 1145 */ 1146 static ieee80211_tx_result 1147 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1148 struct ieee80211_tx_data *tx, 1149 struct sta_info *sta, struct sk_buff *skb) 1150 { 1151 struct ieee80211_local *local = sdata->local; 1152 struct ieee80211_hdr *hdr; 1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1154 int tid; 1155 u8 *qc; 1156 1157 memset(tx, 0, sizeof(*tx)); 1158 tx->skb = skb; 1159 tx->local = local; 1160 tx->sdata = sdata; 1161 __skb_queue_head_init(&tx->skbs); 1162 1163 /* 1164 * If this flag is set to true anywhere, and we get here, 1165 * we are doing the needed processing, so remove the flag 1166 * now. 1167 */ 1168 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1169 1170 hdr = (struct ieee80211_hdr *) skb->data; 1171 1172 if (likely(sta)) { 1173 if (!IS_ERR(sta)) 1174 tx->sta = sta; 1175 } else { 1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1177 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1178 if (!tx->sta && sdata->wdev.use_4addr) 1179 return TX_DROP; 1180 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1181 IEEE80211_TX_CTL_INJECTED) || 1182 tx->sdata->control_port_protocol == tx->skb->protocol) { 1183 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1184 } 1185 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1186 tx->sta = sta_info_get(sdata, hdr->addr1); 1187 } 1188 1189 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1190 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1191 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1192 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1193 struct tid_ampdu_tx *tid_tx; 1194 1195 qc = ieee80211_get_qos_ctl(hdr); 1196 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1197 1198 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1199 if (tid_tx) { 1200 bool queued; 1201 1202 queued = ieee80211_tx_prep_agg(tx, skb, info, 1203 tid_tx, tid); 1204 1205 if (unlikely(queued)) 1206 return TX_QUEUED; 1207 } 1208 } 1209 1210 if (is_multicast_ether_addr(hdr->addr1)) { 1211 tx->flags &= ~IEEE80211_TX_UNICAST; 1212 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1213 } else 1214 tx->flags |= IEEE80211_TX_UNICAST; 1215 1216 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1217 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1218 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1219 info->flags & IEEE80211_TX_CTL_AMPDU) 1220 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1221 } 1222 1223 if (!tx->sta) 1224 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1225 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1227 ieee80211_check_fast_xmit(tx->sta); 1228 } 1229 1230 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1231 1232 return TX_CONTINUE; 1233 } 1234 1235 static void ieee80211_drv_tx(struct ieee80211_local *local, 1236 struct ieee80211_vif *vif, 1237 struct ieee80211_sta *pubsta, 1238 struct sk_buff *skb) 1239 { 1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1243 struct ieee80211_tx_control control = { 1244 .sta = pubsta, 1245 }; 1246 struct ieee80211_txq *txq = NULL; 1247 struct txq_info *txqi; 1248 u8 ac; 1249 1250 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE) 1251 goto tx_normal; 1252 1253 if (!ieee80211_is_data(hdr->frame_control)) 1254 goto tx_normal; 1255 1256 if (pubsta) { 1257 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1258 1259 txq = pubsta->txq[tid]; 1260 } else if (vif) { 1261 txq = vif->txq; 1262 } 1263 1264 if (!txq) 1265 goto tx_normal; 1266 1267 ac = txq->ac; 1268 txqi = to_txq_info(txq); 1269 atomic_inc(&sdata->txqs_len[ac]); 1270 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending) 1271 netif_stop_subqueue(sdata->dev, ac); 1272 1273 spin_lock_bh(&txqi->queue.lock); 1274 txqi->byte_cnt += skb->len; 1275 __skb_queue_tail(&txqi->queue, skb); 1276 spin_unlock_bh(&txqi->queue.lock); 1277 1278 drv_wake_tx_queue(local, txqi); 1279 1280 return; 1281 1282 tx_normal: 1283 drv_tx(local, &control, skb); 1284 } 1285 1286 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1287 struct ieee80211_txq *txq) 1288 { 1289 struct ieee80211_local *local = hw_to_local(hw); 1290 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif); 1291 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1292 struct ieee80211_hdr *hdr; 1293 struct sk_buff *skb = NULL; 1294 u8 ac = txq->ac; 1295 1296 spin_lock_bh(&txqi->queue.lock); 1297 1298 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1299 goto out; 1300 1301 skb = __skb_dequeue(&txqi->queue); 1302 if (!skb) 1303 goto out; 1304 1305 txqi->byte_cnt -= skb->len; 1306 1307 atomic_dec(&sdata->txqs_len[ac]); 1308 if (__netif_subqueue_stopped(sdata->dev, ac)) 1309 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]); 1310 1311 hdr = (struct ieee80211_hdr *)skb->data; 1312 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1313 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1314 sta); 1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1316 1317 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1318 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1319 info->flags |= IEEE80211_TX_CTL_AMPDU; 1320 else 1321 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1322 } 1323 1324 out: 1325 spin_unlock_bh(&txqi->queue.lock); 1326 1327 return skb; 1328 } 1329 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1330 1331 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1332 struct ieee80211_vif *vif, 1333 struct ieee80211_sta *sta, 1334 struct sk_buff_head *skbs, 1335 bool txpending) 1336 { 1337 struct sk_buff *skb, *tmp; 1338 unsigned long flags; 1339 1340 skb_queue_walk_safe(skbs, skb, tmp) { 1341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1342 int q = info->hw_queue; 1343 1344 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1345 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1346 __skb_unlink(skb, skbs); 1347 ieee80211_free_txskb(&local->hw, skb); 1348 continue; 1349 } 1350 #endif 1351 1352 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1353 if (local->queue_stop_reasons[q] || 1354 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1355 if (unlikely(info->flags & 1356 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1357 if (local->queue_stop_reasons[q] & 1358 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1359 /* 1360 * Drop off-channel frames if queues 1361 * are stopped for any reason other 1362 * than off-channel operation. Never 1363 * queue them. 1364 */ 1365 spin_unlock_irqrestore( 1366 &local->queue_stop_reason_lock, 1367 flags); 1368 ieee80211_purge_tx_queue(&local->hw, 1369 skbs); 1370 return true; 1371 } 1372 } else { 1373 1374 /* 1375 * Since queue is stopped, queue up frames for 1376 * later transmission from the tx-pending 1377 * tasklet when the queue is woken again. 1378 */ 1379 if (txpending) 1380 skb_queue_splice_init(skbs, 1381 &local->pending[q]); 1382 else 1383 skb_queue_splice_tail_init(skbs, 1384 &local->pending[q]); 1385 1386 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1387 flags); 1388 return false; 1389 } 1390 } 1391 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1392 1393 info->control.vif = vif; 1394 1395 __skb_unlink(skb, skbs); 1396 ieee80211_drv_tx(local, vif, sta, skb); 1397 } 1398 1399 return true; 1400 } 1401 1402 /* 1403 * Returns false if the frame couldn't be transmitted but was queued instead. 1404 */ 1405 static bool __ieee80211_tx(struct ieee80211_local *local, 1406 struct sk_buff_head *skbs, int led_len, 1407 struct sta_info *sta, bool txpending) 1408 { 1409 struct ieee80211_tx_info *info; 1410 struct ieee80211_sub_if_data *sdata; 1411 struct ieee80211_vif *vif; 1412 struct ieee80211_sta *pubsta; 1413 struct sk_buff *skb; 1414 bool result = true; 1415 __le16 fc; 1416 1417 if (WARN_ON(skb_queue_empty(skbs))) 1418 return true; 1419 1420 skb = skb_peek(skbs); 1421 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1422 info = IEEE80211_SKB_CB(skb); 1423 sdata = vif_to_sdata(info->control.vif); 1424 if (sta && !sta->uploaded) 1425 sta = NULL; 1426 1427 if (sta) 1428 pubsta = &sta->sta; 1429 else 1430 pubsta = NULL; 1431 1432 switch (sdata->vif.type) { 1433 case NL80211_IFTYPE_MONITOR: 1434 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1435 vif = &sdata->vif; 1436 break; 1437 } 1438 sdata = rcu_dereference(local->monitor_sdata); 1439 if (sdata) { 1440 vif = &sdata->vif; 1441 info->hw_queue = 1442 vif->hw_queue[skb_get_queue_mapping(skb)]; 1443 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1444 ieee80211_purge_tx_queue(&local->hw, skbs); 1445 return true; 1446 } else 1447 vif = NULL; 1448 break; 1449 case NL80211_IFTYPE_AP_VLAN: 1450 sdata = container_of(sdata->bss, 1451 struct ieee80211_sub_if_data, u.ap); 1452 /* fall through */ 1453 default: 1454 vif = &sdata->vif; 1455 break; 1456 } 1457 1458 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1459 txpending); 1460 1461 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1462 1463 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1464 1465 return result; 1466 } 1467 1468 /* 1469 * Invoke TX handlers, return 0 on success and non-zero if the 1470 * frame was dropped or queued. 1471 */ 1472 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1473 { 1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1475 ieee80211_tx_result res = TX_DROP; 1476 1477 #define CALL_TXH(txh) \ 1478 do { \ 1479 res = txh(tx); \ 1480 if (res != TX_CONTINUE) \ 1481 goto txh_done; \ 1482 } while (0) 1483 1484 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1485 CALL_TXH(ieee80211_tx_h_check_assoc); 1486 CALL_TXH(ieee80211_tx_h_ps_buf); 1487 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1488 CALL_TXH(ieee80211_tx_h_select_key); 1489 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1490 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1491 1492 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1493 __skb_queue_tail(&tx->skbs, tx->skb); 1494 tx->skb = NULL; 1495 goto txh_done; 1496 } 1497 1498 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1499 CALL_TXH(ieee80211_tx_h_sequence); 1500 CALL_TXH(ieee80211_tx_h_fragment); 1501 /* handlers after fragment must be aware of tx info fragmentation! */ 1502 CALL_TXH(ieee80211_tx_h_stats); 1503 CALL_TXH(ieee80211_tx_h_encrypt); 1504 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1505 CALL_TXH(ieee80211_tx_h_calculate_duration); 1506 #undef CALL_TXH 1507 1508 txh_done: 1509 if (unlikely(res == TX_DROP)) { 1510 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1511 if (tx->skb) 1512 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1513 else 1514 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1515 return -1; 1516 } else if (unlikely(res == TX_QUEUED)) { 1517 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1518 return -1; 1519 } 1520 1521 return 0; 1522 } 1523 1524 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1525 struct ieee80211_vif *vif, struct sk_buff *skb, 1526 int band, struct ieee80211_sta **sta) 1527 { 1528 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1530 struct ieee80211_tx_data tx; 1531 struct sk_buff *skb2; 1532 1533 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1534 return false; 1535 1536 info->band = band; 1537 info->control.vif = vif; 1538 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1539 1540 if (invoke_tx_handlers(&tx)) 1541 return false; 1542 1543 if (sta) { 1544 if (tx.sta) 1545 *sta = &tx.sta->sta; 1546 else 1547 *sta = NULL; 1548 } 1549 1550 /* this function isn't suitable for fragmented data frames */ 1551 skb2 = __skb_dequeue(&tx.skbs); 1552 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1553 ieee80211_free_txskb(hw, skb2); 1554 ieee80211_purge_tx_queue(hw, &tx.skbs); 1555 return false; 1556 } 1557 1558 return true; 1559 } 1560 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1561 1562 /* 1563 * Returns false if the frame couldn't be transmitted but was queued instead. 1564 */ 1565 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1566 struct sta_info *sta, struct sk_buff *skb, 1567 bool txpending) 1568 { 1569 struct ieee80211_local *local = sdata->local; 1570 struct ieee80211_tx_data tx; 1571 ieee80211_tx_result res_prepare; 1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1573 bool result = true; 1574 int led_len; 1575 1576 if (unlikely(skb->len < 10)) { 1577 dev_kfree_skb(skb); 1578 return true; 1579 } 1580 1581 /* initialises tx */ 1582 led_len = skb->len; 1583 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1584 1585 if (unlikely(res_prepare == TX_DROP)) { 1586 ieee80211_free_txskb(&local->hw, skb); 1587 return true; 1588 } else if (unlikely(res_prepare == TX_QUEUED)) { 1589 return true; 1590 } 1591 1592 /* set up hw_queue value early */ 1593 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1594 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1595 info->hw_queue = 1596 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1597 1598 if (!invoke_tx_handlers(&tx)) 1599 result = __ieee80211_tx(local, &tx.skbs, led_len, 1600 tx.sta, txpending); 1601 1602 return result; 1603 } 1604 1605 /* device xmit handlers */ 1606 1607 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1608 struct sk_buff *skb, 1609 int head_need, bool may_encrypt) 1610 { 1611 struct ieee80211_local *local = sdata->local; 1612 int tail_need = 0; 1613 1614 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1615 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1616 tail_need -= skb_tailroom(skb); 1617 tail_need = max_t(int, tail_need, 0); 1618 } 1619 1620 if (skb_cloned(skb) && 1621 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1622 !skb_clone_writable(skb, ETH_HLEN) || 1623 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1624 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1625 else if (head_need || tail_need) 1626 I802_DEBUG_INC(local->tx_expand_skb_head); 1627 else 1628 return 0; 1629 1630 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1631 wiphy_debug(local->hw.wiphy, 1632 "failed to reallocate TX buffer\n"); 1633 return -ENOMEM; 1634 } 1635 1636 return 0; 1637 } 1638 1639 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1640 struct sta_info *sta, struct sk_buff *skb) 1641 { 1642 struct ieee80211_local *local = sdata->local; 1643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1645 int headroom; 1646 bool may_encrypt; 1647 1648 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1649 1650 headroom = local->tx_headroom; 1651 if (may_encrypt) 1652 headroom += sdata->encrypt_headroom; 1653 headroom -= skb_headroom(skb); 1654 headroom = max_t(int, 0, headroom); 1655 1656 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1657 ieee80211_free_txskb(&local->hw, skb); 1658 return; 1659 } 1660 1661 hdr = (struct ieee80211_hdr *) skb->data; 1662 info->control.vif = &sdata->vif; 1663 1664 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1665 if (ieee80211_is_data(hdr->frame_control) && 1666 is_unicast_ether_addr(hdr->addr1)) { 1667 if (mesh_nexthop_resolve(sdata, skb)) 1668 return; /* skb queued: don't free */ 1669 } else { 1670 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1671 } 1672 } 1673 1674 ieee80211_set_qos_hdr(sdata, skb); 1675 ieee80211_tx(sdata, sta, skb, false); 1676 } 1677 1678 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1679 struct sk_buff *skb) 1680 { 1681 struct ieee80211_radiotap_iterator iterator; 1682 struct ieee80211_radiotap_header *rthdr = 1683 (struct ieee80211_radiotap_header *) skb->data; 1684 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1685 struct ieee80211_supported_band *sband = 1686 local->hw.wiphy->bands[info->band]; 1687 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1688 NULL); 1689 u16 txflags; 1690 u16 rate = 0; 1691 bool rate_found = false; 1692 u8 rate_retries = 0; 1693 u16 rate_flags = 0; 1694 u8 mcs_known, mcs_flags; 1695 int i; 1696 1697 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1698 IEEE80211_TX_CTL_DONTFRAG; 1699 1700 /* 1701 * for every radiotap entry that is present 1702 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1703 * entries present, or -EINVAL on error) 1704 */ 1705 1706 while (!ret) { 1707 ret = ieee80211_radiotap_iterator_next(&iterator); 1708 1709 if (ret) 1710 continue; 1711 1712 /* see if this argument is something we can use */ 1713 switch (iterator.this_arg_index) { 1714 /* 1715 * You must take care when dereferencing iterator.this_arg 1716 * for multibyte types... the pointer is not aligned. Use 1717 * get_unaligned((type *)iterator.this_arg) to dereference 1718 * iterator.this_arg for type "type" safely on all arches. 1719 */ 1720 case IEEE80211_RADIOTAP_FLAGS: 1721 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1722 /* 1723 * this indicates that the skb we have been 1724 * handed has the 32-bit FCS CRC at the end... 1725 * we should react to that by snipping it off 1726 * because it will be recomputed and added 1727 * on transmission 1728 */ 1729 if (skb->len < (iterator._max_length + FCS_LEN)) 1730 return false; 1731 1732 skb_trim(skb, skb->len - FCS_LEN); 1733 } 1734 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1735 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1736 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1737 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1738 break; 1739 1740 case IEEE80211_RADIOTAP_TX_FLAGS: 1741 txflags = get_unaligned_le16(iterator.this_arg); 1742 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1743 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1744 break; 1745 1746 case IEEE80211_RADIOTAP_RATE: 1747 rate = *iterator.this_arg; 1748 rate_flags = 0; 1749 rate_found = true; 1750 break; 1751 1752 case IEEE80211_RADIOTAP_DATA_RETRIES: 1753 rate_retries = *iterator.this_arg; 1754 break; 1755 1756 case IEEE80211_RADIOTAP_MCS: 1757 mcs_known = iterator.this_arg[0]; 1758 mcs_flags = iterator.this_arg[1]; 1759 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 1760 break; 1761 1762 rate_found = true; 1763 rate = iterator.this_arg[2]; 1764 rate_flags = IEEE80211_TX_RC_MCS; 1765 1766 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 1767 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 1768 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1769 1770 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 1771 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40) 1772 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 1773 break; 1774 1775 /* 1776 * Please update the file 1777 * Documentation/networking/mac80211-injection.txt 1778 * when parsing new fields here. 1779 */ 1780 1781 default: 1782 break; 1783 } 1784 } 1785 1786 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1787 return false; 1788 1789 if (rate_found) { 1790 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 1791 1792 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 1793 info->control.rates[i].idx = -1; 1794 info->control.rates[i].flags = 0; 1795 info->control.rates[i].count = 0; 1796 } 1797 1798 if (rate_flags & IEEE80211_TX_RC_MCS) { 1799 info->control.rates[0].idx = rate; 1800 } else { 1801 for (i = 0; i < sband->n_bitrates; i++) { 1802 if (rate * 5 != sband->bitrates[i].bitrate) 1803 continue; 1804 1805 info->control.rates[0].idx = i; 1806 break; 1807 } 1808 } 1809 1810 info->control.rates[0].flags = rate_flags; 1811 info->control.rates[0].count = min_t(u8, rate_retries + 1, 1812 local->hw.max_rate_tries); 1813 } 1814 1815 /* 1816 * remove the radiotap header 1817 * iterator->_max_length was sanity-checked against 1818 * skb->len by iterator init 1819 */ 1820 skb_pull(skb, iterator._max_length); 1821 1822 return true; 1823 } 1824 1825 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1826 struct net_device *dev) 1827 { 1828 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1829 struct ieee80211_chanctx_conf *chanctx_conf; 1830 struct ieee80211_radiotap_header *prthdr = 1831 (struct ieee80211_radiotap_header *)skb->data; 1832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1833 struct ieee80211_hdr *hdr; 1834 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1835 struct cfg80211_chan_def *chandef; 1836 u16 len_rthdr; 1837 int hdrlen; 1838 1839 /* check for not even having the fixed radiotap header part */ 1840 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1841 goto fail; /* too short to be possibly valid */ 1842 1843 /* is it a header version we can trust to find length from? */ 1844 if (unlikely(prthdr->it_version)) 1845 goto fail; /* only version 0 is supported */ 1846 1847 /* then there must be a radiotap header with a length we can use */ 1848 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1849 1850 /* does the skb contain enough to deliver on the alleged length? */ 1851 if (unlikely(skb->len < len_rthdr)) 1852 goto fail; /* skb too short for claimed rt header extent */ 1853 1854 /* 1855 * fix up the pointers accounting for the radiotap 1856 * header still being in there. We are being given 1857 * a precooked IEEE80211 header so no need for 1858 * normal processing 1859 */ 1860 skb_set_mac_header(skb, len_rthdr); 1861 /* 1862 * these are just fixed to the end of the rt area since we 1863 * don't have any better information and at this point, nobody cares 1864 */ 1865 skb_set_network_header(skb, len_rthdr); 1866 skb_set_transport_header(skb, len_rthdr); 1867 1868 if (skb->len < len_rthdr + 2) 1869 goto fail; 1870 1871 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1872 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1873 1874 if (skb->len < len_rthdr + hdrlen) 1875 goto fail; 1876 1877 /* 1878 * Initialize skb->protocol if the injected frame is a data frame 1879 * carrying a rfc1042 header 1880 */ 1881 if (ieee80211_is_data(hdr->frame_control) && 1882 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1883 u8 *payload = (u8 *)hdr + hdrlen; 1884 1885 if (ether_addr_equal(payload, rfc1042_header)) 1886 skb->protocol = cpu_to_be16((payload[6] << 8) | 1887 payload[7]); 1888 } 1889 1890 memset(info, 0, sizeof(*info)); 1891 1892 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1893 IEEE80211_TX_CTL_INJECTED; 1894 1895 rcu_read_lock(); 1896 1897 /* 1898 * We process outgoing injected frames that have a local address 1899 * we handle as though they are non-injected frames. 1900 * This code here isn't entirely correct, the local MAC address 1901 * isn't always enough to find the interface to use; for proper 1902 * VLAN/WDS support we will need a different mechanism (which 1903 * likely isn't going to be monitor interfaces). 1904 */ 1905 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1906 1907 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1908 if (!ieee80211_sdata_running(tmp_sdata)) 1909 continue; 1910 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1911 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1912 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1913 continue; 1914 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1915 sdata = tmp_sdata; 1916 break; 1917 } 1918 } 1919 1920 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1921 if (!chanctx_conf) { 1922 tmp_sdata = rcu_dereference(local->monitor_sdata); 1923 if (tmp_sdata) 1924 chanctx_conf = 1925 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1926 } 1927 1928 if (chanctx_conf) 1929 chandef = &chanctx_conf->def; 1930 else if (!local->use_chanctx) 1931 chandef = &local->_oper_chandef; 1932 else 1933 goto fail_rcu; 1934 1935 /* 1936 * Frame injection is not allowed if beaconing is not allowed 1937 * or if we need radar detection. Beaconing is usually not allowed when 1938 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1939 * Passive scan is also used in world regulatory domains where 1940 * your country is not known and as such it should be treated as 1941 * NO TX unless the channel is explicitly allowed in which case 1942 * your current regulatory domain would not have the passive scan 1943 * flag. 1944 * 1945 * Since AP mode uses monitor interfaces to inject/TX management 1946 * frames we can make AP mode the exception to this rule once it 1947 * supports radar detection as its implementation can deal with 1948 * radar detection by itself. We can do that later by adding a 1949 * monitor flag interfaces used for AP support. 1950 */ 1951 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1952 sdata->vif.type)) 1953 goto fail_rcu; 1954 1955 info->band = chandef->chan->band; 1956 1957 /* process and remove the injection radiotap header */ 1958 if (!ieee80211_parse_tx_radiotap(local, skb)) 1959 goto fail_rcu; 1960 1961 ieee80211_xmit(sdata, NULL, skb); 1962 rcu_read_unlock(); 1963 1964 return NETDEV_TX_OK; 1965 1966 fail_rcu: 1967 rcu_read_unlock(); 1968 fail: 1969 dev_kfree_skb(skb); 1970 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1971 } 1972 1973 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 1974 { 1975 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 1976 1977 return ethertype == ETH_P_TDLS && 1978 skb->len > 14 && 1979 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1980 } 1981 1982 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 1983 struct sk_buff *skb, 1984 struct sta_info **sta_out) 1985 { 1986 struct sta_info *sta; 1987 1988 switch (sdata->vif.type) { 1989 case NL80211_IFTYPE_AP_VLAN: 1990 sta = rcu_dereference(sdata->u.vlan.sta); 1991 if (sta) { 1992 *sta_out = sta; 1993 return 0; 1994 } else if (sdata->wdev.use_4addr) { 1995 return -ENOLINK; 1996 } 1997 /* fall through */ 1998 case NL80211_IFTYPE_AP: 1999 case NL80211_IFTYPE_OCB: 2000 case NL80211_IFTYPE_ADHOC: 2001 if (is_multicast_ether_addr(skb->data)) { 2002 *sta_out = ERR_PTR(-ENOENT); 2003 return 0; 2004 } 2005 sta = sta_info_get_bss(sdata, skb->data); 2006 break; 2007 case NL80211_IFTYPE_WDS: 2008 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2009 break; 2010 #ifdef CONFIG_MAC80211_MESH 2011 case NL80211_IFTYPE_MESH_POINT: 2012 /* determined much later */ 2013 *sta_out = NULL; 2014 return 0; 2015 #endif 2016 case NL80211_IFTYPE_STATION: 2017 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2018 sta = sta_info_get(sdata, skb->data); 2019 if (sta) { 2020 bool tdls_peer, tdls_auth; 2021 2022 tdls_peer = test_sta_flag(sta, 2023 WLAN_STA_TDLS_PEER); 2024 tdls_auth = test_sta_flag(sta, 2025 WLAN_STA_TDLS_PEER_AUTH); 2026 2027 if (tdls_peer && tdls_auth) { 2028 *sta_out = sta; 2029 return 0; 2030 } 2031 2032 /* 2033 * TDLS link during setup - throw out frames to 2034 * peer. Allow TDLS-setup frames to unauthorized 2035 * peers for the special case of a link teardown 2036 * after a TDLS sta is removed due to being 2037 * unreachable. 2038 */ 2039 if (tdls_peer && !tdls_auth && 2040 !ieee80211_is_tdls_setup(skb)) 2041 return -EINVAL; 2042 } 2043 2044 } 2045 2046 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2047 if (!sta) 2048 return -ENOLINK; 2049 break; 2050 default: 2051 return -EINVAL; 2052 } 2053 2054 *sta_out = sta ?: ERR_PTR(-ENOENT); 2055 return 0; 2056 } 2057 2058 /** 2059 * ieee80211_build_hdr - build 802.11 header in the given frame 2060 * @sdata: virtual interface to build the header for 2061 * @skb: the skb to build the header in 2062 * @info_flags: skb flags to set 2063 * 2064 * This function takes the skb with 802.3 header and reformats the header to 2065 * the appropriate IEEE 802.11 header based on which interface the packet is 2066 * being transmitted on. 2067 * 2068 * Note that this function also takes care of the TX status request and 2069 * potential unsharing of the SKB - this needs to be interleaved with the 2070 * header building. 2071 * 2072 * The function requires the read-side RCU lock held 2073 * 2074 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2075 */ 2076 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2077 struct sk_buff *skb, u32 info_flags, 2078 struct sta_info *sta) 2079 { 2080 struct ieee80211_local *local = sdata->local; 2081 struct ieee80211_tx_info *info; 2082 int head_need; 2083 u16 ethertype, hdrlen, meshhdrlen = 0; 2084 __le16 fc; 2085 struct ieee80211_hdr hdr; 2086 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2087 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2088 const u8 *encaps_data; 2089 int encaps_len, skip_header_bytes; 2090 int nh_pos, h_pos; 2091 bool wme_sta = false, authorized = false; 2092 bool tdls_peer; 2093 bool multicast; 2094 u16 info_id = 0; 2095 struct ieee80211_chanctx_conf *chanctx_conf; 2096 struct ieee80211_sub_if_data *ap_sdata; 2097 enum ieee80211_band band; 2098 int ret; 2099 2100 if (IS_ERR(sta)) 2101 sta = NULL; 2102 2103 /* convert Ethernet header to proper 802.11 header (based on 2104 * operation mode) */ 2105 ethertype = (skb->data[12] << 8) | skb->data[13]; 2106 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2107 2108 switch (sdata->vif.type) { 2109 case NL80211_IFTYPE_AP_VLAN: 2110 if (sdata->wdev.use_4addr) { 2111 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2112 /* RA TA DA SA */ 2113 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2114 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2115 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2116 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2117 hdrlen = 30; 2118 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2119 wme_sta = sta->sta.wme; 2120 } 2121 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2122 u.ap); 2123 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2124 if (!chanctx_conf) { 2125 ret = -ENOTCONN; 2126 goto free; 2127 } 2128 band = chanctx_conf->def.chan->band; 2129 if (sdata->wdev.use_4addr) 2130 break; 2131 /* fall through */ 2132 case NL80211_IFTYPE_AP: 2133 if (sdata->vif.type == NL80211_IFTYPE_AP) 2134 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2135 if (!chanctx_conf) { 2136 ret = -ENOTCONN; 2137 goto free; 2138 } 2139 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2140 /* DA BSSID SA */ 2141 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2142 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2143 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2144 hdrlen = 24; 2145 band = chanctx_conf->def.chan->band; 2146 break; 2147 case NL80211_IFTYPE_WDS: 2148 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2149 /* RA TA DA SA */ 2150 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2151 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2152 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2153 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2154 hdrlen = 30; 2155 /* 2156 * This is the exception! WDS style interfaces are prohibited 2157 * when channel contexts are in used so this must be valid 2158 */ 2159 band = local->hw.conf.chandef.chan->band; 2160 break; 2161 #ifdef CONFIG_MAC80211_MESH 2162 case NL80211_IFTYPE_MESH_POINT: 2163 if (!is_multicast_ether_addr(skb->data)) { 2164 struct sta_info *next_hop; 2165 bool mpp_lookup = true; 2166 2167 mpath = mesh_path_lookup(sdata, skb->data); 2168 if (mpath) { 2169 mpp_lookup = false; 2170 next_hop = rcu_dereference(mpath->next_hop); 2171 if (!next_hop || 2172 !(mpath->flags & (MESH_PATH_ACTIVE | 2173 MESH_PATH_RESOLVING))) 2174 mpp_lookup = true; 2175 } 2176 2177 if (mpp_lookup) { 2178 mppath = mpp_path_lookup(sdata, skb->data); 2179 if (mppath) 2180 mppath->exp_time = jiffies; 2181 } 2182 2183 if (mppath && mpath) 2184 mesh_path_del(mpath->sdata, mpath->dst); 2185 } 2186 2187 /* 2188 * Use address extension if it is a packet from 2189 * another interface or if we know the destination 2190 * is being proxied by a portal (i.e. portal address 2191 * differs from proxied address) 2192 */ 2193 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2194 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2195 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2196 skb->data, skb->data + ETH_ALEN); 2197 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2198 NULL, NULL); 2199 } else { 2200 /* DS -> MBSS (802.11-2012 13.11.3.3). 2201 * For unicast with unknown forwarding information, 2202 * destination might be in the MBSS or if that fails 2203 * forwarded to another mesh gate. In either case 2204 * resolution will be handled in ieee80211_xmit(), so 2205 * leave the original DA. This also works for mcast */ 2206 const u8 *mesh_da = skb->data; 2207 2208 if (mppath) 2209 mesh_da = mppath->mpp; 2210 else if (mpath) 2211 mesh_da = mpath->dst; 2212 2213 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2214 mesh_da, sdata->vif.addr); 2215 if (is_multicast_ether_addr(mesh_da)) 2216 /* DA TA mSA AE:SA */ 2217 meshhdrlen = ieee80211_new_mesh_header( 2218 sdata, &mesh_hdr, 2219 skb->data + ETH_ALEN, NULL); 2220 else 2221 /* RA TA mDA mSA AE:DA SA */ 2222 meshhdrlen = ieee80211_new_mesh_header( 2223 sdata, &mesh_hdr, skb->data, 2224 skb->data + ETH_ALEN); 2225 2226 } 2227 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2228 if (!chanctx_conf) { 2229 ret = -ENOTCONN; 2230 goto free; 2231 } 2232 band = chanctx_conf->def.chan->band; 2233 break; 2234 #endif 2235 case NL80211_IFTYPE_STATION: 2236 /* we already did checks when looking up the RA STA */ 2237 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2238 2239 if (tdls_peer) { 2240 /* DA SA BSSID */ 2241 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2242 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2243 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2244 hdrlen = 24; 2245 } else if (sdata->u.mgd.use_4addr && 2246 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2247 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2248 IEEE80211_FCTL_TODS); 2249 /* RA TA DA SA */ 2250 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2251 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2252 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2253 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2254 hdrlen = 30; 2255 } else { 2256 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2257 /* BSSID SA DA */ 2258 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2259 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2260 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2261 hdrlen = 24; 2262 } 2263 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2264 if (!chanctx_conf) { 2265 ret = -ENOTCONN; 2266 goto free; 2267 } 2268 band = chanctx_conf->def.chan->band; 2269 break; 2270 case NL80211_IFTYPE_OCB: 2271 /* DA SA BSSID */ 2272 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2273 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2274 eth_broadcast_addr(hdr.addr3); 2275 hdrlen = 24; 2276 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2277 if (!chanctx_conf) { 2278 ret = -ENOTCONN; 2279 goto free; 2280 } 2281 band = chanctx_conf->def.chan->band; 2282 break; 2283 case NL80211_IFTYPE_ADHOC: 2284 /* DA SA BSSID */ 2285 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2286 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2287 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2288 hdrlen = 24; 2289 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2290 if (!chanctx_conf) { 2291 ret = -ENOTCONN; 2292 goto free; 2293 } 2294 band = chanctx_conf->def.chan->band; 2295 break; 2296 default: 2297 ret = -EINVAL; 2298 goto free; 2299 } 2300 2301 multicast = is_multicast_ether_addr(hdr.addr1); 2302 2303 /* sta is always NULL for mesh */ 2304 if (sta) { 2305 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2306 wme_sta = sta->sta.wme; 2307 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2308 /* For mesh, the use of the QoS header is mandatory */ 2309 wme_sta = true; 2310 } 2311 2312 /* receiver does QoS (which also means we do) use it */ 2313 if (wme_sta) { 2314 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2315 hdrlen += 2; 2316 } 2317 2318 /* 2319 * Drop unicast frames to unauthorised stations unless they are 2320 * EAPOL frames from the local station. 2321 */ 2322 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2323 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2324 !multicast && !authorized && 2325 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2326 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2328 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2329 sdata->name, hdr.addr1); 2330 #endif 2331 2332 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2333 2334 ret = -EPERM; 2335 goto free; 2336 } 2337 2338 if (unlikely(!multicast && skb->sk && 2339 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2340 struct sk_buff *ack_skb = skb_clone_sk(skb); 2341 2342 if (ack_skb) { 2343 unsigned long flags; 2344 int id; 2345 2346 spin_lock_irqsave(&local->ack_status_lock, flags); 2347 id = idr_alloc(&local->ack_status_frames, ack_skb, 2348 1, 0x10000, GFP_ATOMIC); 2349 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2350 2351 if (id >= 0) { 2352 info_id = id; 2353 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2354 } else { 2355 kfree_skb(ack_skb); 2356 } 2357 } 2358 } 2359 2360 /* 2361 * If the skb is shared we need to obtain our own copy. 2362 */ 2363 if (skb_shared(skb)) { 2364 struct sk_buff *tmp_skb = skb; 2365 2366 /* can't happen -- skb is a clone if info_id != 0 */ 2367 WARN_ON(info_id); 2368 2369 skb = skb_clone(skb, GFP_ATOMIC); 2370 kfree_skb(tmp_skb); 2371 2372 if (!skb) { 2373 ret = -ENOMEM; 2374 goto free; 2375 } 2376 } 2377 2378 hdr.frame_control = fc; 2379 hdr.duration_id = 0; 2380 hdr.seq_ctrl = 0; 2381 2382 skip_header_bytes = ETH_HLEN; 2383 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2384 encaps_data = bridge_tunnel_header; 2385 encaps_len = sizeof(bridge_tunnel_header); 2386 skip_header_bytes -= 2; 2387 } else if (ethertype >= ETH_P_802_3_MIN) { 2388 encaps_data = rfc1042_header; 2389 encaps_len = sizeof(rfc1042_header); 2390 skip_header_bytes -= 2; 2391 } else { 2392 encaps_data = NULL; 2393 encaps_len = 0; 2394 } 2395 2396 nh_pos = skb_network_header(skb) - skb->data; 2397 h_pos = skb_transport_header(skb) - skb->data; 2398 2399 skb_pull(skb, skip_header_bytes); 2400 nh_pos -= skip_header_bytes; 2401 h_pos -= skip_header_bytes; 2402 2403 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2404 2405 /* 2406 * So we need to modify the skb header and hence need a copy of 2407 * that. The head_need variable above doesn't, so far, include 2408 * the needed header space that we don't need right away. If we 2409 * can, then we don't reallocate right now but only after the 2410 * frame arrives at the master device (if it does...) 2411 * 2412 * If we cannot, however, then we will reallocate to include all 2413 * the ever needed space. Also, if we need to reallocate it anyway, 2414 * make it big enough for everything we may ever need. 2415 */ 2416 2417 if (head_need > 0 || skb_cloned(skb)) { 2418 head_need += sdata->encrypt_headroom; 2419 head_need += local->tx_headroom; 2420 head_need = max_t(int, 0, head_need); 2421 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2422 ieee80211_free_txskb(&local->hw, skb); 2423 skb = NULL; 2424 return ERR_PTR(-ENOMEM); 2425 } 2426 } 2427 2428 if (encaps_data) { 2429 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2430 nh_pos += encaps_len; 2431 h_pos += encaps_len; 2432 } 2433 2434 #ifdef CONFIG_MAC80211_MESH 2435 if (meshhdrlen > 0) { 2436 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2437 nh_pos += meshhdrlen; 2438 h_pos += meshhdrlen; 2439 } 2440 #endif 2441 2442 if (ieee80211_is_data_qos(fc)) { 2443 __le16 *qos_control; 2444 2445 qos_control = (__le16 *) skb_push(skb, 2); 2446 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2447 /* 2448 * Maybe we could actually set some fields here, for now just 2449 * initialise to zero to indicate no special operation. 2450 */ 2451 *qos_control = 0; 2452 } else 2453 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2454 2455 nh_pos += hdrlen; 2456 h_pos += hdrlen; 2457 2458 /* Update skb pointers to various headers since this modified frame 2459 * is going to go through Linux networking code that may potentially 2460 * need things like pointer to IP header. */ 2461 skb_reset_mac_header(skb); 2462 skb_set_network_header(skb, nh_pos); 2463 skb_set_transport_header(skb, h_pos); 2464 2465 info = IEEE80211_SKB_CB(skb); 2466 memset(info, 0, sizeof(*info)); 2467 2468 info->flags = info_flags; 2469 info->ack_frame_id = info_id; 2470 info->band = band; 2471 2472 return skb; 2473 free: 2474 kfree_skb(skb); 2475 return ERR_PTR(ret); 2476 } 2477 2478 /* 2479 * fast-xmit overview 2480 * 2481 * The core idea of this fast-xmit is to remove per-packet checks by checking 2482 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2483 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2484 * much less work can be done per packet. For example, fragmentation must be 2485 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2486 * in the code here. 2487 * 2488 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2489 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2490 * 2491 * The most difficult part of this is that when any of these assumptions 2492 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2493 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2494 * since the per-packet code no longer checks the conditions. This is reflected 2495 * by the calls to these functions throughout the rest of the code, and must be 2496 * maintained if any of the TX path checks change. 2497 */ 2498 2499 void ieee80211_check_fast_xmit(struct sta_info *sta) 2500 { 2501 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2502 struct ieee80211_local *local = sta->local; 2503 struct ieee80211_sub_if_data *sdata = sta->sdata; 2504 struct ieee80211_hdr *hdr = (void *)build.hdr; 2505 struct ieee80211_chanctx_conf *chanctx_conf; 2506 __le16 fc; 2507 2508 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2509 return; 2510 2511 /* Locking here protects both the pointer itself, and against concurrent 2512 * invocations winning data access races to, e.g., the key pointer that 2513 * is used. 2514 * Without it, the invocation of this function right after the key 2515 * pointer changes wouldn't be sufficient, as another CPU could access 2516 * the pointer, then stall, and then do the cache update after the CPU 2517 * that invalidated the key. 2518 * With the locking, such scenarios cannot happen as the check for the 2519 * key and the fast-tx assignment are done atomically, so the CPU that 2520 * modifies the key will either wait or other one will see the key 2521 * cleared/changed already. 2522 */ 2523 spin_lock_bh(&sta->lock); 2524 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2525 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2526 sdata->vif.type == NL80211_IFTYPE_STATION) 2527 goto out; 2528 2529 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2530 goto out; 2531 2532 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2533 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2534 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2535 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2536 goto out; 2537 2538 if (sdata->noack_map) 2539 goto out; 2540 2541 /* fast-xmit doesn't handle fragmentation at all */ 2542 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2543 !local->ops->set_frag_threshold) 2544 goto out; 2545 2546 rcu_read_lock(); 2547 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2548 if (!chanctx_conf) { 2549 rcu_read_unlock(); 2550 goto out; 2551 } 2552 build.band = chanctx_conf->def.chan->band; 2553 rcu_read_unlock(); 2554 2555 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2556 2557 switch (sdata->vif.type) { 2558 case NL80211_IFTYPE_ADHOC: 2559 /* DA SA BSSID */ 2560 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2561 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2562 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2563 build.hdr_len = 24; 2564 break; 2565 case NL80211_IFTYPE_STATION: 2566 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2567 /* DA SA BSSID */ 2568 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2569 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2570 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2571 build.hdr_len = 24; 2572 break; 2573 } 2574 2575 if (sdata->u.mgd.use_4addr) { 2576 /* non-regular ethertype cannot use the fastpath */ 2577 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2578 IEEE80211_FCTL_TODS); 2579 /* RA TA DA SA */ 2580 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2581 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2582 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2583 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2584 build.hdr_len = 30; 2585 break; 2586 } 2587 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2588 /* BSSID SA DA */ 2589 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2590 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2591 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2592 build.hdr_len = 24; 2593 break; 2594 case NL80211_IFTYPE_AP_VLAN: 2595 if (sdata->wdev.use_4addr) { 2596 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2597 IEEE80211_FCTL_TODS); 2598 /* RA TA DA SA */ 2599 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2600 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2601 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2602 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2603 build.hdr_len = 30; 2604 break; 2605 } 2606 /* fall through */ 2607 case NL80211_IFTYPE_AP: 2608 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2609 /* DA BSSID SA */ 2610 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2611 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2612 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2613 build.hdr_len = 24; 2614 break; 2615 default: 2616 /* not handled on fast-xmit */ 2617 goto out; 2618 } 2619 2620 if (sta->sta.wme) { 2621 build.hdr_len += 2; 2622 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2623 } 2624 2625 /* We store the key here so there's no point in using rcu_dereference() 2626 * but that's fine because the code that changes the pointers will call 2627 * this function after doing so. For a single CPU that would be enough, 2628 * for multiple see the comment above. 2629 */ 2630 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2631 if (!build.key) 2632 build.key = rcu_access_pointer(sdata->default_unicast_key); 2633 if (build.key) { 2634 bool gen_iv, iv_spc, mmic; 2635 2636 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2637 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2638 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2639 2640 /* don't handle software crypto */ 2641 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2642 goto out; 2643 2644 switch (build.key->conf.cipher) { 2645 case WLAN_CIPHER_SUITE_CCMP: 2646 case WLAN_CIPHER_SUITE_CCMP_256: 2647 /* add fixed key ID */ 2648 if (gen_iv) { 2649 (build.hdr + build.hdr_len)[3] = 2650 0x20 | (build.key->conf.keyidx << 6); 2651 build.pn_offs = build.hdr_len; 2652 } 2653 if (gen_iv || iv_spc) 2654 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2655 break; 2656 case WLAN_CIPHER_SUITE_GCMP: 2657 case WLAN_CIPHER_SUITE_GCMP_256: 2658 /* add fixed key ID */ 2659 if (gen_iv) { 2660 (build.hdr + build.hdr_len)[3] = 2661 0x20 | (build.key->conf.keyidx << 6); 2662 build.pn_offs = build.hdr_len; 2663 } 2664 if (gen_iv || iv_spc) 2665 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2666 break; 2667 case WLAN_CIPHER_SUITE_TKIP: 2668 /* cannot handle MMIC or IV generation in xmit-fast */ 2669 if (mmic || gen_iv) 2670 goto out; 2671 if (iv_spc) 2672 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2673 break; 2674 case WLAN_CIPHER_SUITE_WEP40: 2675 case WLAN_CIPHER_SUITE_WEP104: 2676 /* cannot handle IV generation in fast-xmit */ 2677 if (gen_iv) 2678 goto out; 2679 if (iv_spc) 2680 build.hdr_len += IEEE80211_WEP_IV_LEN; 2681 break; 2682 case WLAN_CIPHER_SUITE_AES_CMAC: 2683 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2684 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2685 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2686 WARN(1, 2687 "management cipher suite 0x%x enabled for data\n", 2688 build.key->conf.cipher); 2689 goto out; 2690 default: 2691 /* we don't know how to generate IVs for this at all */ 2692 if (WARN_ON(gen_iv)) 2693 goto out; 2694 /* pure hardware keys are OK, of course */ 2695 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2696 break; 2697 /* cipher scheme might require space allocation */ 2698 if (iv_spc && 2699 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2700 goto out; 2701 if (iv_spc) 2702 build.hdr_len += build.key->conf.iv_len; 2703 } 2704 2705 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2706 } 2707 2708 hdr->frame_control = fc; 2709 2710 memcpy(build.hdr + build.hdr_len, 2711 rfc1042_header, sizeof(rfc1042_header)); 2712 build.hdr_len += sizeof(rfc1042_header); 2713 2714 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2715 /* if the kmemdup fails, continue w/o fast_tx */ 2716 if (!fast_tx) 2717 goto out; 2718 2719 out: 2720 /* we might have raced against another call to this function */ 2721 old = rcu_dereference_protected(sta->fast_tx, 2722 lockdep_is_held(&sta->lock)); 2723 rcu_assign_pointer(sta->fast_tx, fast_tx); 2724 if (old) 2725 kfree_rcu(old, rcu_head); 2726 spin_unlock_bh(&sta->lock); 2727 } 2728 2729 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2730 { 2731 struct sta_info *sta; 2732 2733 rcu_read_lock(); 2734 list_for_each_entry_rcu(sta, &local->sta_list, list) 2735 ieee80211_check_fast_xmit(sta); 2736 rcu_read_unlock(); 2737 } 2738 2739 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2740 { 2741 struct ieee80211_local *local = sdata->local; 2742 struct sta_info *sta; 2743 2744 rcu_read_lock(); 2745 2746 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2747 if (sdata != sta->sdata && 2748 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2749 continue; 2750 ieee80211_check_fast_xmit(sta); 2751 } 2752 2753 rcu_read_unlock(); 2754 } 2755 2756 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2757 { 2758 struct ieee80211_fast_tx *fast_tx; 2759 2760 spin_lock_bh(&sta->lock); 2761 fast_tx = rcu_dereference_protected(sta->fast_tx, 2762 lockdep_is_held(&sta->lock)); 2763 RCU_INIT_POINTER(sta->fast_tx, NULL); 2764 spin_unlock_bh(&sta->lock); 2765 2766 if (fast_tx) 2767 kfree_rcu(fast_tx, rcu_head); 2768 } 2769 2770 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 2771 struct net_device *dev, struct sta_info *sta, 2772 struct ieee80211_fast_tx *fast_tx, 2773 struct sk_buff *skb) 2774 { 2775 struct ieee80211_local *local = sdata->local; 2776 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2777 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 2778 int hw_headroom = sdata->local->hw.extra_tx_headroom; 2779 struct ethhdr eth; 2780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2781 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 2782 struct ieee80211_tx_data tx; 2783 ieee80211_tx_result r; 2784 struct tid_ampdu_tx *tid_tx = NULL; 2785 u8 tid = IEEE80211_NUM_TIDS; 2786 2787 /* control port protocol needs a lot of special handling */ 2788 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 2789 return false; 2790 2791 /* only RFC 1042 SNAP */ 2792 if (ethertype < ETH_P_802_3_MIN) 2793 return false; 2794 2795 /* don't handle TX status request here either */ 2796 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 2797 return false; 2798 2799 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2800 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 2801 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 2802 if (tid_tx) { 2803 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 2804 return false; 2805 if (tid_tx->timeout) 2806 tid_tx->last_tx = jiffies; 2807 } 2808 } 2809 2810 /* after this point (skb is modified) we cannot return false */ 2811 2812 if (skb_shared(skb)) { 2813 struct sk_buff *tmp_skb = skb; 2814 2815 skb = skb_clone(skb, GFP_ATOMIC); 2816 kfree_skb(tmp_skb); 2817 2818 if (!skb) 2819 return true; 2820 } 2821 2822 ieee80211_tx_stats(dev, skb->len + extra_head); 2823 2824 /* will not be crypto-handled beyond what we do here, so use false 2825 * as the may-encrypt argument for the resize to not account for 2826 * more room than we already have in 'extra_head' 2827 */ 2828 if (unlikely(ieee80211_skb_resize(sdata, skb, 2829 max_t(int, extra_head + hw_headroom - 2830 skb_headroom(skb), 0), 2831 false))) { 2832 kfree_skb(skb); 2833 return true; 2834 } 2835 2836 memcpy(ð, skb->data, ETH_HLEN - 2); 2837 hdr = (void *)skb_push(skb, extra_head); 2838 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 2839 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 2840 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 2841 2842 memset(info, 0, sizeof(*info)); 2843 info->band = fast_tx->band; 2844 info->control.vif = &sdata->vif; 2845 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 2846 IEEE80211_TX_CTL_DONTFRAG | 2847 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 2848 2849 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 2850 *ieee80211_get_qos_ctl(hdr) = tid; 2851 if (!sta->sta.txq[0]) 2852 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 2853 } else { 2854 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2855 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 2856 sdata->sequence_number += 0x10; 2857 } 2858 2859 if (skb_shinfo(skb)->gso_size) 2860 sta->tx_stats.msdu[tid] += 2861 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 2862 else 2863 sta->tx_stats.msdu[tid]++; 2864 2865 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2866 2867 __skb_queue_head_init(&tx.skbs); 2868 2869 tx.flags = IEEE80211_TX_UNICAST; 2870 tx.local = local; 2871 tx.sdata = sdata; 2872 tx.sta = sta; 2873 tx.key = fast_tx->key; 2874 2875 if (fast_tx->key) 2876 info->control.hw_key = &fast_tx->key->conf; 2877 2878 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 2879 tx.skb = skb; 2880 r = ieee80211_tx_h_rate_ctrl(&tx); 2881 skb = tx.skb; 2882 tx.skb = NULL; 2883 2884 if (r != TX_CONTINUE) { 2885 if (r != TX_QUEUED) 2886 kfree_skb(skb); 2887 return true; 2888 } 2889 } 2890 2891 /* statistics normally done by ieee80211_tx_h_stats (but that 2892 * has to consider fragmentation, so is more complex) 2893 */ 2894 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 2895 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 2896 2897 if (fast_tx->pn_offs) { 2898 u64 pn; 2899 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 2900 2901 switch (fast_tx->key->conf.cipher) { 2902 case WLAN_CIPHER_SUITE_CCMP: 2903 case WLAN_CIPHER_SUITE_CCMP_256: 2904 case WLAN_CIPHER_SUITE_GCMP: 2905 case WLAN_CIPHER_SUITE_GCMP_256: 2906 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 2907 crypto_hdr[0] = pn; 2908 crypto_hdr[1] = pn >> 8; 2909 crypto_hdr[4] = pn >> 16; 2910 crypto_hdr[5] = pn >> 24; 2911 crypto_hdr[6] = pn >> 32; 2912 crypto_hdr[7] = pn >> 40; 2913 break; 2914 } 2915 } 2916 2917 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2918 sdata = container_of(sdata->bss, 2919 struct ieee80211_sub_if_data, u.ap); 2920 2921 __skb_queue_tail(&tx.skbs, skb); 2922 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 2923 return true; 2924 } 2925 2926 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 2927 struct net_device *dev, 2928 u32 info_flags) 2929 { 2930 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2931 struct sta_info *sta; 2932 struct sk_buff *next; 2933 2934 if (unlikely(skb->len < ETH_HLEN)) { 2935 kfree_skb(skb); 2936 return; 2937 } 2938 2939 rcu_read_lock(); 2940 2941 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 2942 goto out_free; 2943 2944 if (!IS_ERR_OR_NULL(sta)) { 2945 struct ieee80211_fast_tx *fast_tx; 2946 2947 fast_tx = rcu_dereference(sta->fast_tx); 2948 2949 if (fast_tx && 2950 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 2951 goto out; 2952 } 2953 2954 if (skb_is_gso(skb)) { 2955 struct sk_buff *segs; 2956 2957 segs = skb_gso_segment(skb, 0); 2958 if (IS_ERR(segs)) { 2959 goto out_free; 2960 } else if (segs) { 2961 consume_skb(skb); 2962 skb = segs; 2963 } 2964 } else { 2965 /* we cannot process non-linear frames on this path */ 2966 if (skb_linearize(skb)) { 2967 kfree_skb(skb); 2968 goto out; 2969 } 2970 2971 /* the frame could be fragmented, software-encrypted, and other 2972 * things so we cannot really handle checksum offload with it - 2973 * fix it up in software before we handle anything else. 2974 */ 2975 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2976 skb_set_transport_header(skb, 2977 skb_checksum_start_offset(skb)); 2978 if (skb_checksum_help(skb)) 2979 goto out_free; 2980 } 2981 } 2982 2983 next = skb; 2984 while (next) { 2985 skb = next; 2986 next = skb->next; 2987 2988 skb->prev = NULL; 2989 skb->next = NULL; 2990 2991 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 2992 if (IS_ERR(skb)) 2993 goto out; 2994 2995 ieee80211_tx_stats(dev, skb->len); 2996 2997 ieee80211_xmit(sdata, sta, skb); 2998 } 2999 goto out; 3000 out_free: 3001 kfree_skb(skb); 3002 out: 3003 rcu_read_unlock(); 3004 } 3005 3006 /** 3007 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3008 * @skb: packet to be sent 3009 * @dev: incoming interface 3010 * 3011 * On failure skb will be freed. 3012 */ 3013 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3014 struct net_device *dev) 3015 { 3016 __ieee80211_subif_start_xmit(skb, dev, 0); 3017 return NETDEV_TX_OK; 3018 } 3019 3020 struct sk_buff * 3021 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3022 struct sk_buff *skb, u32 info_flags) 3023 { 3024 struct ieee80211_hdr *hdr; 3025 struct ieee80211_tx_data tx = { 3026 .local = sdata->local, 3027 .sdata = sdata, 3028 }; 3029 struct sta_info *sta; 3030 3031 rcu_read_lock(); 3032 3033 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3034 kfree_skb(skb); 3035 skb = ERR_PTR(-EINVAL); 3036 goto out; 3037 } 3038 3039 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3040 if (IS_ERR(skb)) 3041 goto out; 3042 3043 hdr = (void *)skb->data; 3044 tx.sta = sta_info_get(sdata, hdr->addr1); 3045 tx.skb = skb; 3046 3047 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3048 rcu_read_unlock(); 3049 kfree_skb(skb); 3050 return ERR_PTR(-EINVAL); 3051 } 3052 3053 out: 3054 rcu_read_unlock(); 3055 return skb; 3056 } 3057 3058 /* 3059 * ieee80211_clear_tx_pending may not be called in a context where 3060 * it is possible that it packets could come in again. 3061 */ 3062 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3063 { 3064 struct sk_buff *skb; 3065 int i; 3066 3067 for (i = 0; i < local->hw.queues; i++) { 3068 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3069 ieee80211_free_txskb(&local->hw, skb); 3070 } 3071 } 3072 3073 /* 3074 * Returns false if the frame couldn't be transmitted but was queued instead, 3075 * which in this case means re-queued -- take as an indication to stop sending 3076 * more pending frames. 3077 */ 3078 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3079 struct sk_buff *skb) 3080 { 3081 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3082 struct ieee80211_sub_if_data *sdata; 3083 struct sta_info *sta; 3084 struct ieee80211_hdr *hdr; 3085 bool result; 3086 struct ieee80211_chanctx_conf *chanctx_conf; 3087 3088 sdata = vif_to_sdata(info->control.vif); 3089 3090 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3091 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3092 if (unlikely(!chanctx_conf)) { 3093 dev_kfree_skb(skb); 3094 return true; 3095 } 3096 info->band = chanctx_conf->def.chan->band; 3097 result = ieee80211_tx(sdata, NULL, skb, true); 3098 } else { 3099 struct sk_buff_head skbs; 3100 3101 __skb_queue_head_init(&skbs); 3102 __skb_queue_tail(&skbs, skb); 3103 3104 hdr = (struct ieee80211_hdr *)skb->data; 3105 sta = sta_info_get(sdata, hdr->addr1); 3106 3107 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3108 } 3109 3110 return result; 3111 } 3112 3113 /* 3114 * Transmit all pending packets. Called from tasklet. 3115 */ 3116 void ieee80211_tx_pending(unsigned long data) 3117 { 3118 struct ieee80211_local *local = (struct ieee80211_local *)data; 3119 unsigned long flags; 3120 int i; 3121 bool txok; 3122 3123 rcu_read_lock(); 3124 3125 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3126 for (i = 0; i < local->hw.queues; i++) { 3127 /* 3128 * If queue is stopped by something other than due to pending 3129 * frames, or we have no pending frames, proceed to next queue. 3130 */ 3131 if (local->queue_stop_reasons[i] || 3132 skb_queue_empty(&local->pending[i])) 3133 continue; 3134 3135 while (!skb_queue_empty(&local->pending[i])) { 3136 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3137 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3138 3139 if (WARN_ON(!info->control.vif)) { 3140 ieee80211_free_txskb(&local->hw, skb); 3141 continue; 3142 } 3143 3144 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3145 flags); 3146 3147 txok = ieee80211_tx_pending_skb(local, skb); 3148 spin_lock_irqsave(&local->queue_stop_reason_lock, 3149 flags); 3150 if (!txok) 3151 break; 3152 } 3153 3154 if (skb_queue_empty(&local->pending[i])) 3155 ieee80211_propagate_queue_wake(local, i); 3156 } 3157 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3158 3159 rcu_read_unlock(); 3160 } 3161 3162 /* functions for drivers to get certain frames */ 3163 3164 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3165 struct ps_data *ps, struct sk_buff *skb, 3166 bool is_template) 3167 { 3168 u8 *pos, *tim; 3169 int aid0 = 0; 3170 int i, have_bits = 0, n1, n2; 3171 3172 /* Generate bitmap for TIM only if there are any STAs in power save 3173 * mode. */ 3174 if (atomic_read(&ps->num_sta_ps) > 0) 3175 /* in the hope that this is faster than 3176 * checking byte-for-byte */ 3177 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3178 IEEE80211_MAX_AID+1); 3179 if (!is_template) { 3180 if (ps->dtim_count == 0) 3181 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3182 else 3183 ps->dtim_count--; 3184 } 3185 3186 tim = pos = (u8 *) skb_put(skb, 6); 3187 *pos++ = WLAN_EID_TIM; 3188 *pos++ = 4; 3189 *pos++ = ps->dtim_count; 3190 *pos++ = sdata->vif.bss_conf.dtim_period; 3191 3192 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3193 aid0 = 1; 3194 3195 ps->dtim_bc_mc = aid0 == 1; 3196 3197 if (have_bits) { 3198 /* Find largest even number N1 so that bits numbered 1 through 3199 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3200 * (N2 + 1) x 8 through 2007 are 0. */ 3201 n1 = 0; 3202 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3203 if (ps->tim[i]) { 3204 n1 = i & 0xfe; 3205 break; 3206 } 3207 } 3208 n2 = n1; 3209 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3210 if (ps->tim[i]) { 3211 n2 = i; 3212 break; 3213 } 3214 } 3215 3216 /* Bitmap control */ 3217 *pos++ = n1 | aid0; 3218 /* Part Virt Bitmap */ 3219 skb_put(skb, n2 - n1); 3220 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3221 3222 tim[1] = n2 - n1 + 4; 3223 } else { 3224 *pos++ = aid0; /* Bitmap control */ 3225 *pos++ = 0; /* Part Virt Bitmap */ 3226 } 3227 } 3228 3229 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3230 struct ps_data *ps, struct sk_buff *skb, 3231 bool is_template) 3232 { 3233 struct ieee80211_local *local = sdata->local; 3234 3235 /* 3236 * Not very nice, but we want to allow the driver to call 3237 * ieee80211_beacon_get() as a response to the set_tim() 3238 * callback. That, however, is already invoked under the 3239 * sta_lock to guarantee consistent and race-free update 3240 * of the tim bitmap in mac80211 and the driver. 3241 */ 3242 if (local->tim_in_locked_section) { 3243 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3244 } else { 3245 spin_lock_bh(&local->tim_lock); 3246 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3247 spin_unlock_bh(&local->tim_lock); 3248 } 3249 3250 return 0; 3251 } 3252 3253 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3254 struct beacon_data *beacon) 3255 { 3256 struct probe_resp *resp; 3257 u8 *beacon_data; 3258 size_t beacon_data_len; 3259 int i; 3260 u8 count = beacon->csa_current_counter; 3261 3262 switch (sdata->vif.type) { 3263 case NL80211_IFTYPE_AP: 3264 beacon_data = beacon->tail; 3265 beacon_data_len = beacon->tail_len; 3266 break; 3267 case NL80211_IFTYPE_ADHOC: 3268 beacon_data = beacon->head; 3269 beacon_data_len = beacon->head_len; 3270 break; 3271 case NL80211_IFTYPE_MESH_POINT: 3272 beacon_data = beacon->head; 3273 beacon_data_len = beacon->head_len; 3274 break; 3275 default: 3276 return; 3277 } 3278 3279 rcu_read_lock(); 3280 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3281 resp = rcu_dereference(sdata->u.ap.probe_resp); 3282 3283 if (beacon->csa_counter_offsets[i]) { 3284 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3285 beacon_data_len)) { 3286 rcu_read_unlock(); 3287 return; 3288 } 3289 3290 beacon_data[beacon->csa_counter_offsets[i]] = count; 3291 } 3292 3293 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3294 resp->data[resp->csa_counter_offsets[i]] = count; 3295 } 3296 rcu_read_unlock(); 3297 } 3298 3299 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3300 { 3301 beacon->csa_current_counter--; 3302 3303 /* the counter should never reach 0 */ 3304 WARN_ON_ONCE(!beacon->csa_current_counter); 3305 3306 return beacon->csa_current_counter; 3307 } 3308 3309 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3310 { 3311 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3312 struct beacon_data *beacon = NULL; 3313 u8 count = 0; 3314 3315 rcu_read_lock(); 3316 3317 if (sdata->vif.type == NL80211_IFTYPE_AP) 3318 beacon = rcu_dereference(sdata->u.ap.beacon); 3319 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3320 beacon = rcu_dereference(sdata->u.ibss.presp); 3321 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3322 beacon = rcu_dereference(sdata->u.mesh.beacon); 3323 3324 if (!beacon) 3325 goto unlock; 3326 3327 count = __ieee80211_csa_update_counter(beacon); 3328 3329 unlock: 3330 rcu_read_unlock(); 3331 return count; 3332 } 3333 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3334 3335 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3336 { 3337 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3338 struct beacon_data *beacon = NULL; 3339 u8 *beacon_data; 3340 size_t beacon_data_len; 3341 int ret = false; 3342 3343 if (!ieee80211_sdata_running(sdata)) 3344 return false; 3345 3346 rcu_read_lock(); 3347 if (vif->type == NL80211_IFTYPE_AP) { 3348 struct ieee80211_if_ap *ap = &sdata->u.ap; 3349 3350 beacon = rcu_dereference(ap->beacon); 3351 if (WARN_ON(!beacon || !beacon->tail)) 3352 goto out; 3353 beacon_data = beacon->tail; 3354 beacon_data_len = beacon->tail_len; 3355 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3356 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3357 3358 beacon = rcu_dereference(ifibss->presp); 3359 if (!beacon) 3360 goto out; 3361 3362 beacon_data = beacon->head; 3363 beacon_data_len = beacon->head_len; 3364 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3365 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3366 3367 beacon = rcu_dereference(ifmsh->beacon); 3368 if (!beacon) 3369 goto out; 3370 3371 beacon_data = beacon->head; 3372 beacon_data_len = beacon->head_len; 3373 } else { 3374 WARN_ON(1); 3375 goto out; 3376 } 3377 3378 if (!beacon->csa_counter_offsets[0]) 3379 goto out; 3380 3381 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3382 goto out; 3383 3384 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3385 ret = true; 3386 out: 3387 rcu_read_unlock(); 3388 3389 return ret; 3390 } 3391 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3392 3393 static struct sk_buff * 3394 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3395 struct ieee80211_vif *vif, 3396 struct ieee80211_mutable_offsets *offs, 3397 bool is_template) 3398 { 3399 struct ieee80211_local *local = hw_to_local(hw); 3400 struct beacon_data *beacon = NULL; 3401 struct sk_buff *skb = NULL; 3402 struct ieee80211_tx_info *info; 3403 struct ieee80211_sub_if_data *sdata = NULL; 3404 enum ieee80211_band band; 3405 struct ieee80211_tx_rate_control txrc; 3406 struct ieee80211_chanctx_conf *chanctx_conf; 3407 int csa_off_base = 0; 3408 3409 rcu_read_lock(); 3410 3411 sdata = vif_to_sdata(vif); 3412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3413 3414 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3415 goto out; 3416 3417 if (offs) 3418 memset(offs, 0, sizeof(*offs)); 3419 3420 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3421 struct ieee80211_if_ap *ap = &sdata->u.ap; 3422 3423 beacon = rcu_dereference(ap->beacon); 3424 if (beacon) { 3425 if (beacon->csa_counter_offsets[0]) { 3426 if (!is_template) 3427 __ieee80211_csa_update_counter(beacon); 3428 3429 ieee80211_set_csa(sdata, beacon); 3430 } 3431 3432 /* 3433 * headroom, head length, 3434 * tail length and maximum TIM length 3435 */ 3436 skb = dev_alloc_skb(local->tx_headroom + 3437 beacon->head_len + 3438 beacon->tail_len + 256 + 3439 local->hw.extra_beacon_tailroom); 3440 if (!skb) 3441 goto out; 3442 3443 skb_reserve(skb, local->tx_headroom); 3444 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3445 beacon->head_len); 3446 3447 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3448 is_template); 3449 3450 if (offs) { 3451 offs->tim_offset = beacon->head_len; 3452 offs->tim_length = skb->len - beacon->head_len; 3453 3454 /* for AP the csa offsets are from tail */ 3455 csa_off_base = skb->len; 3456 } 3457 3458 if (beacon->tail) 3459 memcpy(skb_put(skb, beacon->tail_len), 3460 beacon->tail, beacon->tail_len); 3461 } else 3462 goto out; 3463 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3464 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3465 struct ieee80211_hdr *hdr; 3466 3467 beacon = rcu_dereference(ifibss->presp); 3468 if (!beacon) 3469 goto out; 3470 3471 if (beacon->csa_counter_offsets[0]) { 3472 if (!is_template) 3473 __ieee80211_csa_update_counter(beacon); 3474 3475 ieee80211_set_csa(sdata, beacon); 3476 } 3477 3478 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3479 local->hw.extra_beacon_tailroom); 3480 if (!skb) 3481 goto out; 3482 skb_reserve(skb, local->tx_headroom); 3483 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3484 beacon->head_len); 3485 3486 hdr = (struct ieee80211_hdr *) skb->data; 3487 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3488 IEEE80211_STYPE_BEACON); 3489 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3490 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3491 3492 beacon = rcu_dereference(ifmsh->beacon); 3493 if (!beacon) 3494 goto out; 3495 3496 if (beacon->csa_counter_offsets[0]) { 3497 if (!is_template) 3498 /* TODO: For mesh csa_counter is in TU, so 3499 * decrementing it by one isn't correct, but 3500 * for now we leave it consistent with overall 3501 * mac80211's behavior. 3502 */ 3503 __ieee80211_csa_update_counter(beacon); 3504 3505 ieee80211_set_csa(sdata, beacon); 3506 } 3507 3508 if (ifmsh->sync_ops) 3509 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3510 3511 skb = dev_alloc_skb(local->tx_headroom + 3512 beacon->head_len + 3513 256 + /* TIM IE */ 3514 beacon->tail_len + 3515 local->hw.extra_beacon_tailroom); 3516 if (!skb) 3517 goto out; 3518 skb_reserve(skb, local->tx_headroom); 3519 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3520 beacon->head_len); 3521 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3522 3523 if (offs) { 3524 offs->tim_offset = beacon->head_len; 3525 offs->tim_length = skb->len - beacon->head_len; 3526 } 3527 3528 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3529 beacon->tail_len); 3530 } else { 3531 WARN_ON(1); 3532 goto out; 3533 } 3534 3535 /* CSA offsets */ 3536 if (offs && beacon) { 3537 int i; 3538 3539 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3540 u16 csa_off = beacon->csa_counter_offsets[i]; 3541 3542 if (!csa_off) 3543 continue; 3544 3545 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3546 } 3547 } 3548 3549 band = chanctx_conf->def.chan->band; 3550 3551 info = IEEE80211_SKB_CB(skb); 3552 3553 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3554 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3555 info->band = band; 3556 3557 memset(&txrc, 0, sizeof(txrc)); 3558 txrc.hw = hw; 3559 txrc.sband = local->hw.wiphy->bands[band]; 3560 txrc.bss_conf = &sdata->vif.bss_conf; 3561 txrc.skb = skb; 3562 txrc.reported_rate.idx = -1; 3563 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3564 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3565 txrc.max_rate_idx = -1; 3566 else 3567 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3568 txrc.bss = true; 3569 rate_control_get_rate(sdata, NULL, &txrc); 3570 3571 info->control.vif = vif; 3572 3573 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3574 IEEE80211_TX_CTL_ASSIGN_SEQ | 3575 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3576 out: 3577 rcu_read_unlock(); 3578 return skb; 3579 3580 } 3581 3582 struct sk_buff * 3583 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3584 struct ieee80211_vif *vif, 3585 struct ieee80211_mutable_offsets *offs) 3586 { 3587 return __ieee80211_beacon_get(hw, vif, offs, true); 3588 } 3589 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3590 3591 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3592 struct ieee80211_vif *vif, 3593 u16 *tim_offset, u16 *tim_length) 3594 { 3595 struct ieee80211_mutable_offsets offs = {}; 3596 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3597 struct sk_buff *copy; 3598 struct ieee80211_supported_band *sband; 3599 int shift; 3600 3601 if (!bcn) 3602 return bcn; 3603 3604 if (tim_offset) 3605 *tim_offset = offs.tim_offset; 3606 3607 if (tim_length) 3608 *tim_length = offs.tim_length; 3609 3610 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 3611 !hw_to_local(hw)->monitors) 3612 return bcn; 3613 3614 /* send a copy to monitor interfaces */ 3615 copy = skb_copy(bcn, GFP_ATOMIC); 3616 if (!copy) 3617 return bcn; 3618 3619 shift = ieee80211_vif_get_shift(vif); 3620 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 3621 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 3622 3623 return bcn; 3624 } 3625 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 3626 3627 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 3628 struct ieee80211_vif *vif) 3629 { 3630 struct ieee80211_if_ap *ap = NULL; 3631 struct sk_buff *skb = NULL; 3632 struct probe_resp *presp = NULL; 3633 struct ieee80211_hdr *hdr; 3634 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3635 3636 if (sdata->vif.type != NL80211_IFTYPE_AP) 3637 return NULL; 3638 3639 rcu_read_lock(); 3640 3641 ap = &sdata->u.ap; 3642 presp = rcu_dereference(ap->probe_resp); 3643 if (!presp) 3644 goto out; 3645 3646 skb = dev_alloc_skb(presp->len); 3647 if (!skb) 3648 goto out; 3649 3650 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 3651 3652 hdr = (struct ieee80211_hdr *) skb->data; 3653 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 3654 3655 out: 3656 rcu_read_unlock(); 3657 return skb; 3658 } 3659 EXPORT_SYMBOL(ieee80211_proberesp_get); 3660 3661 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 3662 struct ieee80211_vif *vif) 3663 { 3664 struct ieee80211_sub_if_data *sdata; 3665 struct ieee80211_if_managed *ifmgd; 3666 struct ieee80211_pspoll *pspoll; 3667 struct ieee80211_local *local; 3668 struct sk_buff *skb; 3669 3670 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3671 return NULL; 3672 3673 sdata = vif_to_sdata(vif); 3674 ifmgd = &sdata->u.mgd; 3675 local = sdata->local; 3676 3677 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 3678 if (!skb) 3679 return NULL; 3680 3681 skb_reserve(skb, local->hw.extra_tx_headroom); 3682 3683 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 3684 memset(pspoll, 0, sizeof(*pspoll)); 3685 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 3686 IEEE80211_STYPE_PSPOLL); 3687 pspoll->aid = cpu_to_le16(ifmgd->aid); 3688 3689 /* aid in PS-Poll has its two MSBs each set to 1 */ 3690 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 3691 3692 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 3693 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 3694 3695 return skb; 3696 } 3697 EXPORT_SYMBOL(ieee80211_pspoll_get); 3698 3699 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 3700 struct ieee80211_vif *vif) 3701 { 3702 struct ieee80211_hdr_3addr *nullfunc; 3703 struct ieee80211_sub_if_data *sdata; 3704 struct ieee80211_if_managed *ifmgd; 3705 struct ieee80211_local *local; 3706 struct sk_buff *skb; 3707 3708 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 3709 return NULL; 3710 3711 sdata = vif_to_sdata(vif); 3712 ifmgd = &sdata->u.mgd; 3713 local = sdata->local; 3714 3715 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 3716 if (!skb) 3717 return NULL; 3718 3719 skb_reserve(skb, local->hw.extra_tx_headroom); 3720 3721 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 3722 sizeof(*nullfunc)); 3723 memset(nullfunc, 0, sizeof(*nullfunc)); 3724 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 3725 IEEE80211_STYPE_NULLFUNC | 3726 IEEE80211_FCTL_TODS); 3727 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 3728 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 3729 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 3730 3731 return skb; 3732 } 3733 EXPORT_SYMBOL(ieee80211_nullfunc_get); 3734 3735 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 3736 const u8 *src_addr, 3737 const u8 *ssid, size_t ssid_len, 3738 size_t tailroom) 3739 { 3740 struct ieee80211_local *local = hw_to_local(hw); 3741 struct ieee80211_hdr_3addr *hdr; 3742 struct sk_buff *skb; 3743 size_t ie_ssid_len; 3744 u8 *pos; 3745 3746 ie_ssid_len = 2 + ssid_len; 3747 3748 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 3749 ie_ssid_len + tailroom); 3750 if (!skb) 3751 return NULL; 3752 3753 skb_reserve(skb, local->hw.extra_tx_headroom); 3754 3755 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 3756 memset(hdr, 0, sizeof(*hdr)); 3757 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3758 IEEE80211_STYPE_PROBE_REQ); 3759 eth_broadcast_addr(hdr->addr1); 3760 memcpy(hdr->addr2, src_addr, ETH_ALEN); 3761 eth_broadcast_addr(hdr->addr3); 3762 3763 pos = skb_put(skb, ie_ssid_len); 3764 *pos++ = WLAN_EID_SSID; 3765 *pos++ = ssid_len; 3766 if (ssid_len) 3767 memcpy(pos, ssid, ssid_len); 3768 pos += ssid_len; 3769 3770 return skb; 3771 } 3772 EXPORT_SYMBOL(ieee80211_probereq_get); 3773 3774 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3775 const void *frame, size_t frame_len, 3776 const struct ieee80211_tx_info *frame_txctl, 3777 struct ieee80211_rts *rts) 3778 { 3779 const struct ieee80211_hdr *hdr = frame; 3780 3781 rts->frame_control = 3782 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 3783 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 3784 frame_txctl); 3785 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 3786 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 3787 } 3788 EXPORT_SYMBOL(ieee80211_rts_get); 3789 3790 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 3791 const void *frame, size_t frame_len, 3792 const struct ieee80211_tx_info *frame_txctl, 3793 struct ieee80211_cts *cts) 3794 { 3795 const struct ieee80211_hdr *hdr = frame; 3796 3797 cts->frame_control = 3798 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 3799 cts->duration = ieee80211_ctstoself_duration(hw, vif, 3800 frame_len, frame_txctl); 3801 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 3802 } 3803 EXPORT_SYMBOL(ieee80211_ctstoself_get); 3804 3805 struct sk_buff * 3806 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 3807 struct ieee80211_vif *vif) 3808 { 3809 struct ieee80211_local *local = hw_to_local(hw); 3810 struct sk_buff *skb = NULL; 3811 struct ieee80211_tx_data tx; 3812 struct ieee80211_sub_if_data *sdata; 3813 struct ps_data *ps; 3814 struct ieee80211_tx_info *info; 3815 struct ieee80211_chanctx_conf *chanctx_conf; 3816 3817 sdata = vif_to_sdata(vif); 3818 3819 rcu_read_lock(); 3820 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3821 3822 if (!chanctx_conf) 3823 goto out; 3824 3825 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3826 struct beacon_data *beacon = 3827 rcu_dereference(sdata->u.ap.beacon); 3828 3829 if (!beacon || !beacon->head) 3830 goto out; 3831 3832 ps = &sdata->u.ap.ps; 3833 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3834 ps = &sdata->u.mesh.ps; 3835 } else { 3836 goto out; 3837 } 3838 3839 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 3840 goto out; /* send buffered bc/mc only after DTIM beacon */ 3841 3842 while (1) { 3843 skb = skb_dequeue(&ps->bc_buf); 3844 if (!skb) 3845 goto out; 3846 local->total_ps_buffered--; 3847 3848 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 3849 struct ieee80211_hdr *hdr = 3850 (struct ieee80211_hdr *) skb->data; 3851 /* more buffered multicast/broadcast frames ==> set 3852 * MoreData flag in IEEE 802.11 header to inform PS 3853 * STAs */ 3854 hdr->frame_control |= 3855 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3856 } 3857 3858 if (sdata->vif.type == NL80211_IFTYPE_AP) 3859 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3860 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 3861 break; 3862 dev_kfree_skb_any(skb); 3863 } 3864 3865 info = IEEE80211_SKB_CB(skb); 3866 3867 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3868 info->band = chanctx_conf->def.chan->band; 3869 3870 if (invoke_tx_handlers(&tx)) 3871 skb = NULL; 3872 out: 3873 rcu_read_unlock(); 3874 3875 return skb; 3876 } 3877 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3878 3879 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3880 { 3881 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3882 struct ieee80211_sub_if_data *sdata = sta->sdata; 3883 struct ieee80211_local *local = sdata->local; 3884 int ret; 3885 u32 queues; 3886 3887 lockdep_assert_held(&local->sta_mtx); 3888 3889 /* only some cases are supported right now */ 3890 switch (sdata->vif.type) { 3891 case NL80211_IFTYPE_STATION: 3892 case NL80211_IFTYPE_AP: 3893 case NL80211_IFTYPE_AP_VLAN: 3894 break; 3895 default: 3896 WARN_ON(1); 3897 return -EINVAL; 3898 } 3899 3900 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 3901 return -EINVAL; 3902 3903 if (sta->reserved_tid == tid) { 3904 ret = 0; 3905 goto out; 3906 } 3907 3908 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 3909 sdata_err(sdata, "TID reservation already active\n"); 3910 ret = -EALREADY; 3911 goto out; 3912 } 3913 3914 ieee80211_stop_vif_queues(sdata->local, sdata, 3915 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3916 3917 synchronize_net(); 3918 3919 /* Tear down BA sessions so we stop aggregating on this TID */ 3920 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 3921 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 3922 __ieee80211_stop_tx_ba_session(sta, tid, 3923 AGG_STOP_LOCAL_REQUEST); 3924 } 3925 3926 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 3927 __ieee80211_flush_queues(local, sdata, queues, false); 3928 3929 sta->reserved_tid = tid; 3930 3931 ieee80211_wake_vif_queues(local, sdata, 3932 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 3933 3934 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 3935 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 3936 3937 ret = 0; 3938 out: 3939 return ret; 3940 } 3941 EXPORT_SYMBOL(ieee80211_reserve_tid); 3942 3943 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 3944 { 3945 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 3946 struct ieee80211_sub_if_data *sdata = sta->sdata; 3947 3948 lockdep_assert_held(&sdata->local->sta_mtx); 3949 3950 /* only some cases are supported right now */ 3951 switch (sdata->vif.type) { 3952 case NL80211_IFTYPE_STATION: 3953 case NL80211_IFTYPE_AP: 3954 case NL80211_IFTYPE_AP_VLAN: 3955 break; 3956 default: 3957 WARN_ON(1); 3958 return; 3959 } 3960 3961 if (tid != sta->reserved_tid) { 3962 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 3963 return; 3964 } 3965 3966 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 3967 } 3968 EXPORT_SYMBOL(ieee80211_unreserve_tid); 3969 3970 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3971 struct sk_buff *skb, int tid, 3972 enum ieee80211_band band) 3973 { 3974 int ac = ieee802_1d_to_ac[tid & 7]; 3975 3976 skb_reset_mac_header(skb); 3977 skb_reset_network_header(skb); 3978 skb_reset_transport_header(skb); 3979 3980 skb_set_queue_mapping(skb, ac); 3981 skb->priority = tid; 3982 3983 skb->dev = sdata->dev; 3984 3985 /* 3986 * The other path calling ieee80211_xmit is from the tasklet, 3987 * and while we can handle concurrent transmissions locking 3988 * requirements are that we do not come into tx with bhs on. 3989 */ 3990 local_bh_disable(); 3991 IEEE80211_SKB_CB(skb)->band = band; 3992 ieee80211_xmit(sdata, NULL, skb); 3993 local_bh_enable(); 3994 } 3995