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 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * 12 * Transmit and frame generation functions. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/bitmap.h> 20 #include <linux/rcupdate.h> 21 #include <linux/export.h> 22 #include <linux/time.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 __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 41 struct sk_buff *skb, int group_addr, 42 int next_frag_len) 43 { 44 int rate, mrate, erp, dur, i, shift = 0; 45 struct ieee80211_rate *txrate; 46 struct ieee80211_local *local = tx->local; 47 struct ieee80211_supported_band *sband; 48 struct ieee80211_hdr *hdr; 49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 50 struct ieee80211_chanctx_conf *chanctx_conf; 51 u32 rate_flags = 0; 52 53 rcu_read_lock(); 54 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 55 if (chanctx_conf) { 56 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 57 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 58 } 59 rcu_read_unlock(); 60 61 /* assume HW handles this */ 62 if (tx->rate.flags & IEEE80211_TX_RC_MCS) 63 return 0; 64 65 /* uh huh? */ 66 if (WARN_ON_ONCE(tx->rate.idx < 0)) 67 return 0; 68 69 sband = local->hw.wiphy->bands[info->band]; 70 txrate = &sband->bitrates[tx->rate.idx]; 71 72 erp = txrate->flags & IEEE80211_RATE_ERP_G; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 133 if (r->bitrate > txrate->bitrate) 134 break; 135 136 if ((rate_flags & r->flags) != rate_flags) 137 continue; 138 139 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 140 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 141 142 switch (sband->band) { 143 case IEEE80211_BAND_2GHZ: { 144 u32 flag; 145 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 146 flag = IEEE80211_RATE_MANDATORY_G; 147 else 148 flag = IEEE80211_RATE_MANDATORY_B; 149 if (r->flags & flag) 150 mrate = r->bitrate; 151 break; 152 } 153 case IEEE80211_BAND_5GHZ: 154 if (r->flags & IEEE80211_RATE_MANDATORY_A) 155 mrate = r->bitrate; 156 break; 157 case IEEE80211_BAND_60GHZ: 158 /* TODO, for now fall through */ 159 case IEEE80211_NUM_BANDS: 160 WARN_ON(1); 161 break; 162 } 163 } 164 if (rate == -1) { 165 /* No matching basic rate found; use highest suitable mandatory 166 * PHY rate */ 167 rate = DIV_ROUND_UP(mrate, 1 << shift); 168 } 169 170 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 171 if (ieee80211_is_data_qos(hdr->frame_control) && 172 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 173 dur = 0; 174 else 175 /* Time needed to transmit ACK 176 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 177 * to closest integer */ 178 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 179 tx->sdata->vif.bss_conf.use_short_preamble, 180 shift); 181 182 if (next_frag_len) { 183 /* Frame is fragmented: duration increases with time needed to 184 * transmit next fragment plus ACK and 2 x SIFS. */ 185 dur *= 2; /* ACK + SIFS */ 186 /* next fragment */ 187 dur += ieee80211_frame_duration(sband->band, next_frag_len, 188 txrate->bitrate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 } 192 193 return cpu_to_le16(dur); 194 } 195 196 /* tx handlers */ 197 static ieee80211_tx_result debug_noinline 198 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 199 { 200 struct ieee80211_local *local = tx->local; 201 struct ieee80211_if_managed *ifmgd; 202 203 /* driver doesn't support power save */ 204 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 205 return TX_CONTINUE; 206 207 /* hardware does dynamic power save */ 208 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 209 return TX_CONTINUE; 210 211 /* dynamic power save disabled */ 212 if (local->hw.conf.dynamic_ps_timeout <= 0) 213 return TX_CONTINUE; 214 215 /* we are scanning, don't enable power save */ 216 if (local->scanning) 217 return TX_CONTINUE; 218 219 if (!local->ps_sdata) 220 return TX_CONTINUE; 221 222 /* No point if we're going to suspend */ 223 if (local->quiescing) 224 return TX_CONTINUE; 225 226 /* dynamic ps is supported only in managed mode */ 227 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 228 return TX_CONTINUE; 229 230 ifmgd = &tx->sdata->u.mgd; 231 232 /* 233 * Don't wakeup from power save if u-apsd is enabled, voip ac has 234 * u-apsd enabled and the frame is in voip class. This effectively 235 * means that even if all access categories have u-apsd enabled, in 236 * practise u-apsd is only used with the voip ac. This is a 237 * workaround for the case when received voip class packets do not 238 * have correct qos tag for some reason, due the network or the 239 * peer application. 240 * 241 * Note: ifmgd->uapsd_queues access is racy here. If the value is 242 * changed via debugfs, user needs to reassociate manually to have 243 * everything in sync. 244 */ 245 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 246 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 247 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 248 return TX_CONTINUE; 249 250 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 251 ieee80211_stop_queues_by_reason(&local->hw, 252 IEEE80211_MAX_QUEUE_MAP, 253 IEEE80211_QUEUE_STOP_REASON_PS); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 ieee80211_queue_work(&local->hw, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 275 bool assoc = false; 276 277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 278 return TX_CONTINUE; 279 280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 282 !ieee80211_is_probe_req(hdr->frame_control) && 283 !ieee80211_is_nullfunc(hdr->frame_control)) 284 /* 285 * When software scanning only nullfunc frames (to notify 286 * the sleep state to the AP) and probe requests (for the 287 * active scan) are allowed, all other frames should not be 288 * sent and we should not get here, but if we do 289 * nonetheless, drop them to avoid sending them 290 * off-channel. See the link below and 291 * ieee80211_start_scan() for more. 292 * 293 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 294 */ 295 return TX_DROP; 296 297 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 298 return TX_CONTINUE; 299 300 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 301 return TX_CONTINUE; 302 303 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 304 return TX_CONTINUE; 305 306 if (tx->sta) 307 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 308 309 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 310 if (unlikely(!assoc && 311 ieee80211_is_data(hdr->frame_control))) { 312 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 313 sdata_info(tx->sdata, 314 "dropped data frame to not associated station %pM\n", 315 hdr->addr1); 316 #endif 317 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 318 return TX_DROP; 319 } 320 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 321 ieee80211_is_data(hdr->frame_control) && 322 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 323 /* 324 * No associated STAs - no need to send multicast 325 * frames. 326 */ 327 return TX_DROP; 328 } 329 330 return TX_CONTINUE; 331 } 332 333 /* This function is called whenever the AP is about to exceed the maximum limit 334 * of buffered frames for power saving STAs. This situation should not really 335 * happen often during normal operation, so dropping the oldest buffered packet 336 * from each queue should be OK to make some room for new frames. */ 337 static void purge_old_ps_buffers(struct ieee80211_local *local) 338 { 339 int total = 0, purged = 0; 340 struct sk_buff *skb; 341 struct ieee80211_sub_if_data *sdata; 342 struct sta_info *sta; 343 344 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 345 struct ps_data *ps; 346 347 if (sdata->vif.type == NL80211_IFTYPE_AP) 348 ps = &sdata->u.ap.ps; 349 else if (ieee80211_vif_is_mesh(&sdata->vif)) 350 ps = &sdata->u.mesh.ps; 351 else 352 continue; 353 354 skb = skb_dequeue(&ps->bc_buf); 355 if (skb) { 356 purged++; 357 dev_kfree_skb(skb); 358 } 359 total += skb_queue_len(&ps->bc_buf); 360 } 361 362 /* 363 * Drop one frame from each station from the lowest-priority 364 * AC that has frames at all. 365 */ 366 list_for_each_entry_rcu(sta, &local->sta_list, list) { 367 int ac; 368 369 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 370 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 371 total += skb_queue_len(&sta->ps_tx_buf[ac]); 372 if (skb) { 373 purged++; 374 ieee80211_free_txskb(&local->hw, skb); 375 break; 376 } 377 } 378 } 379 380 local->total_ps_buffered = total; 381 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 382 } 383 384 static ieee80211_tx_result 385 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 386 { 387 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 388 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 389 struct ps_data *ps; 390 391 /* 392 * broadcast/multicast frame 393 * 394 * If any of the associated/peer stations is in power save mode, 395 * the frame is buffered to be sent after DTIM beacon frame. 396 * This is done either by the hardware or us. 397 */ 398 399 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 400 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 401 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 402 if (!tx->sdata->bss) 403 return TX_CONTINUE; 404 405 ps = &tx->sdata->bss->ps; 406 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 407 ps = &tx->sdata->u.mesh.ps; 408 } else { 409 return TX_CONTINUE; 410 } 411 412 413 /* no buffering for ordered frames */ 414 if (ieee80211_has_order(hdr->frame_control)) 415 return TX_CONTINUE; 416 417 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 418 info->hw_queue = tx->sdata->vif.cab_queue; 419 420 /* no stations in PS mode */ 421 if (!atomic_read(&ps->num_sta_ps)) 422 return TX_CONTINUE; 423 424 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 425 426 /* device releases frame after DTIM beacon */ 427 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 428 return TX_CONTINUE; 429 430 /* buffered in mac80211 */ 431 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 432 purge_old_ps_buffers(tx->local); 433 434 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 435 ps_dbg(tx->sdata, 436 "BC TX buffer full - dropping the oldest frame\n"); 437 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 438 } else 439 tx->local->total_ps_buffered++; 440 441 skb_queue_tail(&ps->bc_buf, tx->skb); 442 443 return TX_QUEUED; 444 } 445 446 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 447 struct sk_buff *skb) 448 { 449 if (!ieee80211_is_mgmt(fc)) 450 return 0; 451 452 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 453 return 0; 454 455 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 456 skb->data)) 457 return 0; 458 459 return 1; 460 } 461 462 static ieee80211_tx_result 463 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 464 { 465 struct sta_info *sta = tx->sta; 466 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 467 struct ieee80211_local *local = tx->local; 468 469 if (unlikely(!sta)) 470 return TX_CONTINUE; 471 472 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 473 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 475 int ac = skb_get_queue_mapping(tx->skb); 476 477 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 478 sta->sta.addr, sta->sta.aid, ac); 479 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 480 purge_old_ps_buffers(tx->local); 481 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 482 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 483 ps_dbg(tx->sdata, 484 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 485 sta->sta.addr, ac); 486 ieee80211_free_txskb(&local->hw, old); 487 } else 488 tx->local->total_ps_buffered++; 489 490 info->control.jiffies = jiffies; 491 info->control.vif = &tx->sdata->vif; 492 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 493 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 494 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 495 496 if (!timer_pending(&local->sta_cleanup)) 497 mod_timer(&local->sta_cleanup, 498 round_jiffies(jiffies + 499 STA_INFO_CLEANUP_INTERVAL)); 500 501 /* 502 * We queued up some frames, so the TIM bit might 503 * need to be set, recalculate it. 504 */ 505 sta_info_recalc_tim(sta); 506 507 return TX_QUEUED; 508 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 509 ps_dbg(tx->sdata, 510 "STA %pM in PS mode, but polling/in SP -> send frame\n", 511 sta->sta.addr); 512 } 513 514 return TX_CONTINUE; 515 } 516 517 static ieee80211_tx_result debug_noinline 518 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 519 { 520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 521 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 522 523 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 524 return TX_CONTINUE; 525 526 /* only deauth, disassoc and action are bufferable MMPDUs */ 527 if (ieee80211_is_mgmt(hdr->frame_control) && 528 !ieee80211_is_deauth(hdr->frame_control) && 529 !ieee80211_is_disassoc(hdr->frame_control) && 530 !ieee80211_is_action(hdr->frame_control)) { 531 if (tx->flags & IEEE80211_TX_UNICAST) 532 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 533 return TX_CONTINUE; 534 } 535 536 if (tx->flags & IEEE80211_TX_UNICAST) 537 return ieee80211_tx_h_unicast_ps_buf(tx); 538 else 539 return ieee80211_tx_h_multicast_ps_buf(tx); 540 } 541 542 static ieee80211_tx_result debug_noinline 543 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 544 { 545 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 546 547 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 548 if (tx->sdata->control_port_no_encrypt) 549 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 550 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 551 } 552 553 return TX_CONTINUE; 554 } 555 556 static ieee80211_tx_result debug_noinline 557 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 558 { 559 struct ieee80211_key *key; 560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 561 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 562 563 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 564 tx->key = NULL; 565 else if (tx->sta && 566 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 567 tx->key = key; 568 else if (ieee80211_is_mgmt(hdr->frame_control) && 569 is_multicast_ether_addr(hdr->addr1) && 570 ieee80211_is_robust_mgmt_frame(hdr) && 571 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 572 tx->key = key; 573 else if (is_multicast_ether_addr(hdr->addr1) && 574 (key = rcu_dereference(tx->sdata->default_multicast_key))) 575 tx->key = key; 576 else if (!is_multicast_ether_addr(hdr->addr1) && 577 (key = rcu_dereference(tx->sdata->default_unicast_key))) 578 tx->key = key; 579 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 580 tx->key = NULL; 581 else if (!tx->sdata->drop_unencrypted) 582 tx->key = NULL; 583 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 584 tx->key = NULL; 585 else if (ieee80211_is_robust_mgmt_frame(hdr) && 586 !(ieee80211_is_action(hdr->frame_control) && 587 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 588 tx->key = NULL; 589 else if (ieee80211_is_mgmt(hdr->frame_control) && 590 !ieee80211_is_robust_mgmt_frame(hdr)) 591 tx->key = NULL; 592 else { 593 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 594 return TX_DROP; 595 } 596 597 if (tx->key) { 598 bool skip_hw = false; 599 600 tx->key->tx_rx_count++; 601 /* TODO: add threshold stuff again */ 602 603 switch (tx->key->conf.cipher) { 604 case WLAN_CIPHER_SUITE_WEP40: 605 case WLAN_CIPHER_SUITE_WEP104: 606 case WLAN_CIPHER_SUITE_TKIP: 607 if (!ieee80211_is_data_present(hdr->frame_control)) 608 tx->key = NULL; 609 break; 610 case WLAN_CIPHER_SUITE_CCMP: 611 if (!ieee80211_is_data_present(hdr->frame_control) && 612 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 613 tx->skb)) 614 tx->key = NULL; 615 else 616 skip_hw = (tx->key->conf.flags & 617 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 618 ieee80211_is_mgmt(hdr->frame_control); 619 break; 620 case WLAN_CIPHER_SUITE_AES_CMAC: 621 if (!ieee80211_is_mgmt(hdr->frame_control)) 622 tx->key = NULL; 623 break; 624 } 625 626 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 627 !ieee80211_is_deauth(hdr->frame_control))) 628 return TX_DROP; 629 630 if (!skip_hw && tx->key && 631 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 632 info->control.hw_key = &tx->key->conf; 633 } 634 635 return TX_CONTINUE; 636 } 637 638 static ieee80211_tx_result debug_noinline 639 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 640 { 641 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 642 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 643 struct ieee80211_supported_band *sband; 644 u32 len; 645 struct ieee80211_tx_rate_control txrc; 646 struct ieee80211_sta_rates *ratetbl = NULL; 647 bool assoc = false; 648 649 memset(&txrc, 0, sizeof(txrc)); 650 651 sband = tx->local->hw.wiphy->bands[info->band]; 652 653 len = min_t(u32, tx->skb->len + FCS_LEN, 654 tx->local->hw.wiphy->frag_threshold); 655 656 /* set up the tx rate control struct we give the RC algo */ 657 txrc.hw = &tx->local->hw; 658 txrc.sband = sband; 659 txrc.bss_conf = &tx->sdata->vif.bss_conf; 660 txrc.skb = tx->skb; 661 txrc.reported_rate.idx = -1; 662 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 663 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 664 txrc.max_rate_idx = -1; 665 else 666 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 667 668 if (tx->sdata->rc_has_mcs_mask[info->band]) 669 txrc.rate_idx_mcs_mask = 670 tx->sdata->rc_rateidx_mcs_mask[info->band]; 671 672 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 673 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 674 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 675 676 /* set up RTS protection if desired */ 677 if (len > tx->local->hw.wiphy->rts_threshold) { 678 txrc.rts = true; 679 } 680 681 info->control.use_rts = txrc.rts; 682 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 683 684 /* 685 * Use short preamble if the BSS can handle it, but not for 686 * management frames unless we know the receiver can handle 687 * that -- the management frame might be to a station that 688 * just wants a probe response. 689 */ 690 if (tx->sdata->vif.bss_conf.use_short_preamble && 691 (ieee80211_is_data(hdr->frame_control) || 692 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 693 txrc.short_preamble = true; 694 695 info->control.short_preamble = txrc.short_preamble; 696 697 if (tx->sta) 698 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 699 700 /* 701 * Lets not bother rate control if we're associated and cannot 702 * talk to the sta. This should not happen. 703 */ 704 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 705 !rate_usable_index_exists(sband, &tx->sta->sta), 706 "%s: Dropped data frame as no usable bitrate found while " 707 "scanning and associated. Target station: " 708 "%pM on %d GHz band\n", 709 tx->sdata->name, hdr->addr1, 710 info->band ? 5 : 2)) 711 return TX_DROP; 712 713 /* 714 * If we're associated with the sta at this point we know we can at 715 * least send the frame at the lowest bit rate. 716 */ 717 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 718 719 if (tx->sta && !info->control.skip_table) 720 ratetbl = rcu_dereference(tx->sta->sta.rates); 721 722 if (unlikely(info->control.rates[0].idx < 0)) { 723 if (ratetbl) { 724 struct ieee80211_tx_rate rate = { 725 .idx = ratetbl->rate[0].idx, 726 .flags = ratetbl->rate[0].flags, 727 .count = ratetbl->rate[0].count 728 }; 729 730 if (ratetbl->rate[0].idx < 0) 731 return TX_DROP; 732 733 tx->rate = rate; 734 } else { 735 return TX_DROP; 736 } 737 } else { 738 tx->rate = info->control.rates[0]; 739 } 740 741 if (txrc.reported_rate.idx < 0) { 742 txrc.reported_rate = tx->rate; 743 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 744 tx->sta->last_tx_rate = txrc.reported_rate; 745 } else if (tx->sta) 746 tx->sta->last_tx_rate = txrc.reported_rate; 747 748 if (ratetbl) 749 return TX_CONTINUE; 750 751 if (unlikely(!info->control.rates[0].count)) 752 info->control.rates[0].count = 1; 753 754 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 755 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 756 info->control.rates[0].count = 1; 757 758 return TX_CONTINUE; 759 } 760 761 static ieee80211_tx_result debug_noinline 762 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 763 { 764 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 765 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 766 u16 *seq; 767 u8 *qc; 768 int tid; 769 770 /* 771 * Packet injection may want to control the sequence 772 * number, if we have no matching interface then we 773 * neither assign one ourselves nor ask the driver to. 774 */ 775 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 776 return TX_CONTINUE; 777 778 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 779 return TX_CONTINUE; 780 781 if (ieee80211_hdrlen(hdr->frame_control) < 24) 782 return TX_CONTINUE; 783 784 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 785 return TX_CONTINUE; 786 787 /* 788 * Anything but QoS data that has a sequence number field 789 * (is long enough) gets a sequence number from the global 790 * counter. QoS data frames with a multicast destination 791 * also use the global counter (802.11-2012 9.3.2.10). 792 */ 793 if (!ieee80211_is_data_qos(hdr->frame_control) || 794 is_multicast_ether_addr(hdr->addr1)) { 795 /* driver should assign sequence number */ 796 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 797 /* for pure STA mode without beacons, we can do it */ 798 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 799 tx->sdata->sequence_number += 0x10; 800 return TX_CONTINUE; 801 } 802 803 /* 804 * This should be true for injected/management frames only, for 805 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 806 * above since they are not QoS-data frames. 807 */ 808 if (!tx->sta) 809 return TX_CONTINUE; 810 811 /* include per-STA, per-TID sequence counter */ 812 813 qc = ieee80211_get_qos_ctl(hdr); 814 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 815 seq = &tx->sta->tid_seq[tid]; 816 817 hdr->seq_ctrl = cpu_to_le16(*seq); 818 819 /* Increase the sequence number. */ 820 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 821 822 return TX_CONTINUE; 823 } 824 825 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 826 struct sk_buff *skb, int hdrlen, 827 int frag_threshold) 828 { 829 struct ieee80211_local *local = tx->local; 830 struct ieee80211_tx_info *info; 831 struct sk_buff *tmp; 832 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 833 int pos = hdrlen + per_fragm; 834 int rem = skb->len - hdrlen - per_fragm; 835 836 if (WARN_ON(rem < 0)) 837 return -EINVAL; 838 839 /* first fragment was already added to queue by caller */ 840 841 while (rem) { 842 int fraglen = per_fragm; 843 844 if (fraglen > rem) 845 fraglen = rem; 846 rem -= fraglen; 847 tmp = dev_alloc_skb(local->tx_headroom + 848 frag_threshold + 849 tx->sdata->encrypt_headroom + 850 IEEE80211_ENCRYPT_TAILROOM); 851 if (!tmp) 852 return -ENOMEM; 853 854 __skb_queue_tail(&tx->skbs, tmp); 855 856 skb_reserve(tmp, 857 local->tx_headroom + tx->sdata->encrypt_headroom); 858 859 /* copy control information */ 860 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 861 862 info = IEEE80211_SKB_CB(tmp); 863 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 864 IEEE80211_TX_CTL_FIRST_FRAGMENT); 865 866 if (rem) 867 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 868 869 skb_copy_queue_mapping(tmp, skb); 870 tmp->priority = skb->priority; 871 tmp->dev = skb->dev; 872 873 /* copy header and data */ 874 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 875 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 876 877 pos += fraglen; 878 } 879 880 /* adjust first fragment's length */ 881 skb_trim(skb, hdrlen + per_fragm); 882 return 0; 883 } 884 885 static ieee80211_tx_result debug_noinline 886 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 887 { 888 struct sk_buff *skb = tx->skb; 889 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 890 struct ieee80211_hdr *hdr = (void *)skb->data; 891 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 892 int hdrlen; 893 int fragnum; 894 895 /* no matter what happens, tx->skb moves to tx->skbs */ 896 __skb_queue_tail(&tx->skbs, skb); 897 tx->skb = NULL; 898 899 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 900 return TX_CONTINUE; 901 902 if (tx->local->ops->set_frag_threshold) 903 return TX_CONTINUE; 904 905 /* 906 * Warn when submitting a fragmented A-MPDU frame and drop it. 907 * This scenario is handled in ieee80211_tx_prepare but extra 908 * caution taken here as fragmented ampdu may cause Tx stop. 909 */ 910 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 911 return TX_DROP; 912 913 hdrlen = ieee80211_hdrlen(hdr->frame_control); 914 915 /* internal error, why isn't DONTFRAG set? */ 916 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 917 return TX_DROP; 918 919 /* 920 * Now fragment the frame. This will allocate all the fragments and 921 * chain them (using skb as the first fragment) to skb->next. 922 * During transmission, we will remove the successfully transmitted 923 * fragments from this list. When the low-level driver rejects one 924 * of the fragments then we will simply pretend to accept the skb 925 * but store it away as pending. 926 */ 927 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 928 return TX_DROP; 929 930 /* update duration/seq/flags of fragments */ 931 fragnum = 0; 932 933 skb_queue_walk(&tx->skbs, skb) { 934 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 935 936 hdr = (void *)skb->data; 937 info = IEEE80211_SKB_CB(skb); 938 939 if (!skb_queue_is_last(&tx->skbs, skb)) { 940 hdr->frame_control |= morefrags; 941 /* 942 * No multi-rate retries for fragmented frames, that 943 * would completely throw off the NAV at other STAs. 944 */ 945 info->control.rates[1].idx = -1; 946 info->control.rates[2].idx = -1; 947 info->control.rates[3].idx = -1; 948 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 949 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 950 } else { 951 hdr->frame_control &= ~morefrags; 952 } 953 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 954 fragnum++; 955 } 956 957 return TX_CONTINUE; 958 } 959 960 static ieee80211_tx_result debug_noinline 961 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 962 { 963 struct sk_buff *skb; 964 int ac = -1; 965 966 if (!tx->sta) 967 return TX_CONTINUE; 968 969 skb_queue_walk(&tx->skbs, skb) { 970 ac = skb_get_queue_mapping(skb); 971 tx->sta->tx_fragments++; 972 tx->sta->tx_bytes[ac] += skb->len; 973 } 974 if (ac >= 0) 975 tx->sta->tx_packets[ac]++; 976 977 return TX_CONTINUE; 978 } 979 980 static ieee80211_tx_result debug_noinline 981 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 982 { 983 if (!tx->key) 984 return TX_CONTINUE; 985 986 switch (tx->key->conf.cipher) { 987 case WLAN_CIPHER_SUITE_WEP40: 988 case WLAN_CIPHER_SUITE_WEP104: 989 return ieee80211_crypto_wep_encrypt(tx); 990 case WLAN_CIPHER_SUITE_TKIP: 991 return ieee80211_crypto_tkip_encrypt(tx); 992 case WLAN_CIPHER_SUITE_CCMP: 993 return ieee80211_crypto_ccmp_encrypt(tx); 994 case WLAN_CIPHER_SUITE_AES_CMAC: 995 return ieee80211_crypto_aes_cmac_encrypt(tx); 996 default: 997 return ieee80211_crypto_hw_encrypt(tx); 998 } 999 1000 return TX_DROP; 1001 } 1002 1003 static ieee80211_tx_result debug_noinline 1004 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1005 { 1006 struct sk_buff *skb; 1007 struct ieee80211_hdr *hdr; 1008 int next_len; 1009 bool group_addr; 1010 1011 skb_queue_walk(&tx->skbs, skb) { 1012 hdr = (void *) skb->data; 1013 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1014 break; /* must not overwrite AID */ 1015 if (!skb_queue_is_last(&tx->skbs, skb)) { 1016 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1017 next_len = next->len; 1018 } else 1019 next_len = 0; 1020 group_addr = is_multicast_ether_addr(hdr->addr1); 1021 1022 hdr->duration_id = 1023 ieee80211_duration(tx, skb, group_addr, next_len); 1024 } 1025 1026 return TX_CONTINUE; 1027 } 1028 1029 /* actual transmit path */ 1030 1031 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1032 struct sk_buff *skb, 1033 struct ieee80211_tx_info *info, 1034 struct tid_ampdu_tx *tid_tx, 1035 int tid) 1036 { 1037 bool queued = false; 1038 bool reset_agg_timer = false; 1039 struct sk_buff *purge_skb = NULL; 1040 1041 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1042 info->flags |= IEEE80211_TX_CTL_AMPDU; 1043 reset_agg_timer = true; 1044 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1045 /* 1046 * nothing -- this aggregation session is being started 1047 * but that might still fail with the driver 1048 */ 1049 } else { 1050 spin_lock(&tx->sta->lock); 1051 /* 1052 * Need to re-check now, because we may get here 1053 * 1054 * 1) in the window during which the setup is actually 1055 * already done, but not marked yet because not all 1056 * packets are spliced over to the driver pending 1057 * queue yet -- if this happened we acquire the lock 1058 * either before or after the splice happens, but 1059 * need to recheck which of these cases happened. 1060 * 1061 * 2) during session teardown, if the OPERATIONAL bit 1062 * was cleared due to the teardown but the pointer 1063 * hasn't been assigned NULL yet (or we loaded it 1064 * before it was assigned) -- in this case it may 1065 * now be NULL which means we should just let the 1066 * packet pass through because splicing the frames 1067 * back is already done. 1068 */ 1069 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1070 1071 if (!tid_tx) { 1072 /* do nothing, let packet pass through */ 1073 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1074 info->flags |= IEEE80211_TX_CTL_AMPDU; 1075 reset_agg_timer = true; 1076 } else { 1077 queued = true; 1078 info->control.vif = &tx->sdata->vif; 1079 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1080 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1081 __skb_queue_tail(&tid_tx->pending, skb); 1082 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1083 purge_skb = __skb_dequeue(&tid_tx->pending); 1084 } 1085 spin_unlock(&tx->sta->lock); 1086 1087 if (purge_skb) 1088 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1089 } 1090 1091 /* reset session timer */ 1092 if (reset_agg_timer && tid_tx->timeout) 1093 tid_tx->last_tx = jiffies; 1094 1095 return queued; 1096 } 1097 1098 /* 1099 * initialises @tx 1100 */ 1101 static ieee80211_tx_result 1102 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1103 struct ieee80211_tx_data *tx, 1104 struct sk_buff *skb) 1105 { 1106 struct ieee80211_local *local = sdata->local; 1107 struct ieee80211_hdr *hdr; 1108 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1109 int tid; 1110 u8 *qc; 1111 1112 memset(tx, 0, sizeof(*tx)); 1113 tx->skb = skb; 1114 tx->local = local; 1115 tx->sdata = sdata; 1116 __skb_queue_head_init(&tx->skbs); 1117 1118 /* 1119 * If this flag is set to true anywhere, and we get here, 1120 * we are doing the needed processing, so remove the flag 1121 * now. 1122 */ 1123 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1124 1125 hdr = (struct ieee80211_hdr *) skb->data; 1126 1127 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1128 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1129 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1130 return TX_DROP; 1131 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED | 1132 IEEE80211_TX_INTFL_NL80211_FRAME_TX) || 1133 tx->sdata->control_port_protocol == tx->skb->protocol) { 1134 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1135 } 1136 if (!tx->sta) 1137 tx->sta = sta_info_get(sdata, hdr->addr1); 1138 1139 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1140 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1141 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1142 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1143 struct tid_ampdu_tx *tid_tx; 1144 1145 qc = ieee80211_get_qos_ctl(hdr); 1146 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1147 1148 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1149 if (tid_tx) { 1150 bool queued; 1151 1152 queued = ieee80211_tx_prep_agg(tx, skb, info, 1153 tid_tx, tid); 1154 1155 if (unlikely(queued)) 1156 return TX_QUEUED; 1157 } 1158 } 1159 1160 if (is_multicast_ether_addr(hdr->addr1)) { 1161 tx->flags &= ~IEEE80211_TX_UNICAST; 1162 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1163 } else 1164 tx->flags |= IEEE80211_TX_UNICAST; 1165 1166 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1167 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1168 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1169 info->flags & IEEE80211_TX_CTL_AMPDU) 1170 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1171 } 1172 1173 if (!tx->sta) 1174 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1175 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1176 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1177 1178 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1179 1180 return TX_CONTINUE; 1181 } 1182 1183 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1184 struct ieee80211_vif *vif, 1185 struct ieee80211_sta *sta, 1186 struct sk_buff_head *skbs, 1187 bool txpending) 1188 { 1189 struct ieee80211_tx_control control; 1190 struct sk_buff *skb, *tmp; 1191 unsigned long flags; 1192 1193 skb_queue_walk_safe(skbs, skb, tmp) { 1194 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1195 int q = info->hw_queue; 1196 1197 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1198 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1199 __skb_unlink(skb, skbs); 1200 ieee80211_free_txskb(&local->hw, skb); 1201 continue; 1202 } 1203 #endif 1204 1205 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1206 if (local->queue_stop_reasons[q] || 1207 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1208 if (unlikely(info->flags & 1209 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1210 if (local->queue_stop_reasons[q] & 1211 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1212 /* 1213 * Drop off-channel frames if queues 1214 * are stopped for any reason other 1215 * than off-channel operation. Never 1216 * queue them. 1217 */ 1218 spin_unlock_irqrestore( 1219 &local->queue_stop_reason_lock, 1220 flags); 1221 ieee80211_purge_tx_queue(&local->hw, 1222 skbs); 1223 return true; 1224 } 1225 } else { 1226 1227 /* 1228 * Since queue is stopped, queue up frames for 1229 * later transmission from the tx-pending 1230 * tasklet when the queue is woken again. 1231 */ 1232 if (txpending) 1233 skb_queue_splice_init(skbs, 1234 &local->pending[q]); 1235 else 1236 skb_queue_splice_tail_init(skbs, 1237 &local->pending[q]); 1238 1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1240 flags); 1241 return false; 1242 } 1243 } 1244 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1245 1246 info->control.vif = vif; 1247 control.sta = sta; 1248 1249 __skb_unlink(skb, skbs); 1250 drv_tx(local, &control, skb); 1251 } 1252 1253 return true; 1254 } 1255 1256 /* 1257 * Returns false if the frame couldn't be transmitted but was queued instead. 1258 */ 1259 static bool __ieee80211_tx(struct ieee80211_local *local, 1260 struct sk_buff_head *skbs, int led_len, 1261 struct sta_info *sta, bool txpending) 1262 { 1263 struct ieee80211_tx_info *info; 1264 struct ieee80211_sub_if_data *sdata; 1265 struct ieee80211_vif *vif; 1266 struct ieee80211_sta *pubsta; 1267 struct sk_buff *skb; 1268 bool result = true; 1269 __le16 fc; 1270 1271 if (WARN_ON(skb_queue_empty(skbs))) 1272 return true; 1273 1274 skb = skb_peek(skbs); 1275 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1276 info = IEEE80211_SKB_CB(skb); 1277 sdata = vif_to_sdata(info->control.vif); 1278 if (sta && !sta->uploaded) 1279 sta = NULL; 1280 1281 if (sta) 1282 pubsta = &sta->sta; 1283 else 1284 pubsta = NULL; 1285 1286 switch (sdata->vif.type) { 1287 case NL80211_IFTYPE_MONITOR: 1288 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1289 vif = &sdata->vif; 1290 break; 1291 } 1292 sdata = rcu_dereference(local->monitor_sdata); 1293 if (sdata) { 1294 vif = &sdata->vif; 1295 info->hw_queue = 1296 vif->hw_queue[skb_get_queue_mapping(skb)]; 1297 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1298 dev_kfree_skb(skb); 1299 return true; 1300 } else 1301 vif = NULL; 1302 break; 1303 case NL80211_IFTYPE_AP_VLAN: 1304 sdata = container_of(sdata->bss, 1305 struct ieee80211_sub_if_data, u.ap); 1306 /* fall through */ 1307 default: 1308 vif = &sdata->vif; 1309 break; 1310 } 1311 1312 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1313 txpending); 1314 1315 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1316 1317 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1318 1319 return result; 1320 } 1321 1322 /* 1323 * Invoke TX handlers, return 0 on success and non-zero if the 1324 * frame was dropped or queued. 1325 */ 1326 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1327 { 1328 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1329 ieee80211_tx_result res = TX_DROP; 1330 1331 #define CALL_TXH(txh) \ 1332 do { \ 1333 res = txh(tx); \ 1334 if (res != TX_CONTINUE) \ 1335 goto txh_done; \ 1336 } while (0) 1337 1338 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1339 CALL_TXH(ieee80211_tx_h_check_assoc); 1340 CALL_TXH(ieee80211_tx_h_ps_buf); 1341 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1342 CALL_TXH(ieee80211_tx_h_select_key); 1343 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1344 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1345 1346 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1347 __skb_queue_tail(&tx->skbs, tx->skb); 1348 tx->skb = NULL; 1349 goto txh_done; 1350 } 1351 1352 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1353 CALL_TXH(ieee80211_tx_h_sequence); 1354 CALL_TXH(ieee80211_tx_h_fragment); 1355 /* handlers after fragment must be aware of tx info fragmentation! */ 1356 CALL_TXH(ieee80211_tx_h_stats); 1357 CALL_TXH(ieee80211_tx_h_encrypt); 1358 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1359 CALL_TXH(ieee80211_tx_h_calculate_duration); 1360 #undef CALL_TXH 1361 1362 txh_done: 1363 if (unlikely(res == TX_DROP)) { 1364 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1365 if (tx->skb) 1366 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1367 else 1368 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1369 return -1; 1370 } else if (unlikely(res == TX_QUEUED)) { 1371 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1372 return -1; 1373 } 1374 1375 return 0; 1376 } 1377 1378 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1379 struct ieee80211_vif *vif, struct sk_buff *skb, 1380 int band, struct ieee80211_sta **sta) 1381 { 1382 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1384 struct ieee80211_tx_data tx; 1385 1386 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) 1387 return false; 1388 1389 info->band = band; 1390 info->control.vif = vif; 1391 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1392 1393 if (invoke_tx_handlers(&tx)) 1394 return false; 1395 1396 if (sta) { 1397 if (tx.sta) 1398 *sta = &tx.sta->sta; 1399 else 1400 *sta = NULL; 1401 } 1402 1403 return true; 1404 } 1405 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1406 1407 /* 1408 * Returns false if the frame couldn't be transmitted but was queued instead. 1409 */ 1410 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1411 struct sk_buff *skb, bool txpending, 1412 enum ieee80211_band band) 1413 { 1414 struct ieee80211_local *local = sdata->local; 1415 struct ieee80211_tx_data tx; 1416 ieee80211_tx_result res_prepare; 1417 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1418 bool result = true; 1419 int led_len; 1420 1421 if (unlikely(skb->len < 10)) { 1422 dev_kfree_skb(skb); 1423 return true; 1424 } 1425 1426 /* initialises tx */ 1427 led_len = skb->len; 1428 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1429 1430 if (unlikely(res_prepare == TX_DROP)) { 1431 ieee80211_free_txskb(&local->hw, skb); 1432 return true; 1433 } else if (unlikely(res_prepare == TX_QUEUED)) { 1434 return true; 1435 } 1436 1437 info->band = band; 1438 1439 /* set up hw_queue value early */ 1440 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1441 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1442 info->hw_queue = 1443 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1444 1445 if (!invoke_tx_handlers(&tx)) 1446 result = __ieee80211_tx(local, &tx.skbs, led_len, 1447 tx.sta, txpending); 1448 1449 return result; 1450 } 1451 1452 /* device xmit handlers */ 1453 1454 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1455 struct sk_buff *skb, 1456 int head_need, bool may_encrypt) 1457 { 1458 struct ieee80211_local *local = sdata->local; 1459 int tail_need = 0; 1460 1461 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1462 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1463 tail_need -= skb_tailroom(skb); 1464 tail_need = max_t(int, tail_need, 0); 1465 } 1466 1467 if (skb_cloned(skb)) 1468 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1469 else if (head_need || tail_need) 1470 I802_DEBUG_INC(local->tx_expand_skb_head); 1471 else 1472 return 0; 1473 1474 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1475 wiphy_debug(local->hw.wiphy, 1476 "failed to reallocate TX buffer\n"); 1477 return -ENOMEM; 1478 } 1479 1480 return 0; 1481 } 1482 1483 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1484 enum ieee80211_band band) 1485 { 1486 struct ieee80211_local *local = sdata->local; 1487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1489 int headroom; 1490 bool may_encrypt; 1491 1492 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1493 1494 headroom = local->tx_headroom; 1495 if (may_encrypt) 1496 headroom += sdata->encrypt_headroom; 1497 headroom -= skb_headroom(skb); 1498 headroom = max_t(int, 0, headroom); 1499 1500 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1501 ieee80211_free_txskb(&local->hw, skb); 1502 return; 1503 } 1504 1505 hdr = (struct ieee80211_hdr *) skb->data; 1506 info->control.vif = &sdata->vif; 1507 1508 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1509 if (ieee80211_is_data(hdr->frame_control) && 1510 is_unicast_ether_addr(hdr->addr1)) { 1511 if (mesh_nexthop_resolve(sdata, skb)) 1512 return; /* skb queued: don't free */ 1513 } else { 1514 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1515 } 1516 } 1517 1518 ieee80211_set_qos_hdr(sdata, skb); 1519 ieee80211_tx(sdata, skb, false, band); 1520 } 1521 1522 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1523 { 1524 struct ieee80211_radiotap_iterator iterator; 1525 struct ieee80211_radiotap_header *rthdr = 1526 (struct ieee80211_radiotap_header *) skb->data; 1527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1528 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1529 NULL); 1530 u16 txflags; 1531 1532 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1533 IEEE80211_TX_CTL_DONTFRAG; 1534 1535 /* 1536 * for every radiotap entry that is present 1537 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1538 * entries present, or -EINVAL on error) 1539 */ 1540 1541 while (!ret) { 1542 ret = ieee80211_radiotap_iterator_next(&iterator); 1543 1544 if (ret) 1545 continue; 1546 1547 /* see if this argument is something we can use */ 1548 switch (iterator.this_arg_index) { 1549 /* 1550 * You must take care when dereferencing iterator.this_arg 1551 * for multibyte types... the pointer is not aligned. Use 1552 * get_unaligned((type *)iterator.this_arg) to dereference 1553 * iterator.this_arg for type "type" safely on all arches. 1554 */ 1555 case IEEE80211_RADIOTAP_FLAGS: 1556 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1557 /* 1558 * this indicates that the skb we have been 1559 * handed has the 32-bit FCS CRC at the end... 1560 * we should react to that by snipping it off 1561 * because it will be recomputed and added 1562 * on transmission 1563 */ 1564 if (skb->len < (iterator._max_length + FCS_LEN)) 1565 return false; 1566 1567 skb_trim(skb, skb->len - FCS_LEN); 1568 } 1569 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1570 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1571 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1572 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1573 break; 1574 1575 case IEEE80211_RADIOTAP_TX_FLAGS: 1576 txflags = get_unaligned_le16(iterator.this_arg); 1577 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1578 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1579 break; 1580 1581 /* 1582 * Please update the file 1583 * Documentation/networking/mac80211-injection.txt 1584 * when parsing new fields here. 1585 */ 1586 1587 default: 1588 break; 1589 } 1590 } 1591 1592 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1593 return false; 1594 1595 /* 1596 * remove the radiotap header 1597 * iterator->_max_length was sanity-checked against 1598 * skb->len by iterator init 1599 */ 1600 skb_pull(skb, iterator._max_length); 1601 1602 return true; 1603 } 1604 1605 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1606 struct net_device *dev) 1607 { 1608 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1609 struct ieee80211_chanctx_conf *chanctx_conf; 1610 struct ieee80211_channel *chan; 1611 struct ieee80211_radiotap_header *prthdr = 1612 (struct ieee80211_radiotap_header *)skb->data; 1613 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1614 struct ieee80211_hdr *hdr; 1615 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1616 u16 len_rthdr; 1617 int hdrlen; 1618 1619 /* check for not even having the fixed radiotap header part */ 1620 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1621 goto fail; /* too short to be possibly valid */ 1622 1623 /* is it a header version we can trust to find length from? */ 1624 if (unlikely(prthdr->it_version)) 1625 goto fail; /* only version 0 is supported */ 1626 1627 /* then there must be a radiotap header with a length we can use */ 1628 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1629 1630 /* does the skb contain enough to deliver on the alleged length? */ 1631 if (unlikely(skb->len < len_rthdr)) 1632 goto fail; /* skb too short for claimed rt header extent */ 1633 1634 /* 1635 * fix up the pointers accounting for the radiotap 1636 * header still being in there. We are being given 1637 * a precooked IEEE80211 header so no need for 1638 * normal processing 1639 */ 1640 skb_set_mac_header(skb, len_rthdr); 1641 /* 1642 * these are just fixed to the end of the rt area since we 1643 * don't have any better information and at this point, nobody cares 1644 */ 1645 skb_set_network_header(skb, len_rthdr); 1646 skb_set_transport_header(skb, len_rthdr); 1647 1648 if (skb->len < len_rthdr + 2) 1649 goto fail; 1650 1651 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1652 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1653 1654 if (skb->len < len_rthdr + hdrlen) 1655 goto fail; 1656 1657 /* 1658 * Initialize skb->protocol if the injected frame is a data frame 1659 * carrying a rfc1042 header 1660 */ 1661 if (ieee80211_is_data(hdr->frame_control) && 1662 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1663 u8 *payload = (u8 *)hdr + hdrlen; 1664 1665 if (ether_addr_equal(payload, rfc1042_header)) 1666 skb->protocol = cpu_to_be16((payload[6] << 8) | 1667 payload[7]); 1668 } 1669 1670 memset(info, 0, sizeof(*info)); 1671 1672 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1673 IEEE80211_TX_CTL_INJECTED; 1674 1675 /* process and remove the injection radiotap header */ 1676 if (!ieee80211_parse_tx_radiotap(skb)) 1677 goto fail; 1678 1679 rcu_read_lock(); 1680 1681 /* 1682 * We process outgoing injected frames that have a local address 1683 * we handle as though they are non-injected frames. 1684 * This code here isn't entirely correct, the local MAC address 1685 * isn't always enough to find the interface to use; for proper 1686 * VLAN/WDS support we will need a different mechanism (which 1687 * likely isn't going to be monitor interfaces). 1688 */ 1689 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1690 1691 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1692 if (!ieee80211_sdata_running(tmp_sdata)) 1693 continue; 1694 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1695 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1696 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1697 continue; 1698 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1699 sdata = tmp_sdata; 1700 break; 1701 } 1702 } 1703 1704 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1705 if (!chanctx_conf) { 1706 tmp_sdata = rcu_dereference(local->monitor_sdata); 1707 if (tmp_sdata) 1708 chanctx_conf = 1709 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1710 } 1711 1712 if (chanctx_conf) 1713 chan = chanctx_conf->def.chan; 1714 else if (!local->use_chanctx) 1715 chan = local->_oper_chandef.chan; 1716 else 1717 goto fail_rcu; 1718 1719 /* 1720 * Frame injection is not allowed if beaconing is not allowed 1721 * or if we need radar detection. Beaconing is usually not allowed when 1722 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1723 * Passive scan is also used in world regulatory domains where 1724 * your country is not known and as such it should be treated as 1725 * NO TX unless the channel is explicitly allowed in which case 1726 * your current regulatory domain would not have the passive scan 1727 * flag. 1728 * 1729 * Since AP mode uses monitor interfaces to inject/TX management 1730 * frames we can make AP mode the exception to this rule once it 1731 * supports radar detection as its implementation can deal with 1732 * radar detection by itself. We can do that later by adding a 1733 * monitor flag interfaces used for AP support. 1734 */ 1735 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))) 1736 goto fail_rcu; 1737 1738 ieee80211_xmit(sdata, skb, chan->band); 1739 rcu_read_unlock(); 1740 1741 return NETDEV_TX_OK; 1742 1743 fail_rcu: 1744 rcu_read_unlock(); 1745 fail: 1746 dev_kfree_skb(skb); 1747 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1748 } 1749 1750 /* 1751 * Measure Tx frame arrival time for Tx latency statistics calculation 1752 * A single Tx frame latency should be measured from when it is entering the 1753 * Kernel until we receive Tx complete confirmation indication and the skb is 1754 * freed. 1755 */ 1756 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local, 1757 struct sk_buff *skb) 1758 { 1759 struct timespec skb_arv; 1760 struct ieee80211_tx_latency_bin_ranges *tx_latency; 1761 1762 tx_latency = rcu_dereference(local->tx_latency); 1763 if (!tx_latency) 1764 return; 1765 1766 ktime_get_ts(&skb_arv); 1767 skb->tstamp = ktime_set(skb_arv.tv_sec, skb_arv.tv_nsec); 1768 } 1769 1770 /** 1771 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1772 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1773 * @skb: packet to be sent 1774 * @dev: incoming interface 1775 * 1776 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1777 * not be freed, and caller is responsible for either retrying later or freeing 1778 * skb). 1779 * 1780 * This function takes in an Ethernet header and encapsulates it with suitable 1781 * IEEE 802.11 header based on which interface the packet is coming in. The 1782 * encapsulated packet will then be passed to master interface, wlan#.11, for 1783 * transmission (through low-level driver). 1784 */ 1785 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1786 struct net_device *dev) 1787 { 1788 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1789 struct ieee80211_local *local = sdata->local; 1790 struct ieee80211_tx_info *info; 1791 int head_need; 1792 u16 ethertype, hdrlen, meshhdrlen = 0; 1793 __le16 fc; 1794 struct ieee80211_hdr hdr; 1795 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1796 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1797 const u8 *encaps_data; 1798 int encaps_len, skip_header_bytes; 1799 int nh_pos, h_pos; 1800 struct sta_info *sta = NULL; 1801 bool wme_sta = false, authorized = false, tdls_auth = false; 1802 bool tdls_direct = false; 1803 bool multicast; 1804 u32 info_flags = 0; 1805 u16 info_id = 0; 1806 struct ieee80211_chanctx_conf *chanctx_conf; 1807 struct ieee80211_sub_if_data *ap_sdata; 1808 enum ieee80211_band band; 1809 1810 if (unlikely(skb->len < ETH_HLEN)) 1811 goto fail; 1812 1813 /* convert Ethernet header to proper 802.11 header (based on 1814 * operation mode) */ 1815 ethertype = (skb->data[12] << 8) | skb->data[13]; 1816 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1817 1818 rcu_read_lock(); 1819 1820 /* Measure frame arrival for Tx latency statistics calculation */ 1821 ieee80211_tx_latency_start_msrmnt(local, skb); 1822 1823 switch (sdata->vif.type) { 1824 case NL80211_IFTYPE_AP_VLAN: 1825 sta = rcu_dereference(sdata->u.vlan.sta); 1826 if (sta) { 1827 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1828 /* RA TA DA SA */ 1829 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1830 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1831 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1832 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1833 hdrlen = 30; 1834 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1835 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1836 } 1837 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1838 u.ap); 1839 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1840 if (!chanctx_conf) 1841 goto fail_rcu; 1842 band = chanctx_conf->def.chan->band; 1843 if (sta) 1844 break; 1845 /* fall through */ 1846 case NL80211_IFTYPE_AP: 1847 if (sdata->vif.type == NL80211_IFTYPE_AP) 1848 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1849 if (!chanctx_conf) 1850 goto fail_rcu; 1851 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1852 /* DA BSSID SA */ 1853 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1854 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1855 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1856 hdrlen = 24; 1857 band = chanctx_conf->def.chan->band; 1858 break; 1859 case NL80211_IFTYPE_WDS: 1860 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1861 /* RA TA DA SA */ 1862 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1863 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1864 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1865 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1866 hdrlen = 30; 1867 /* 1868 * This is the exception! WDS style interfaces are prohibited 1869 * when channel contexts are in used so this must be valid 1870 */ 1871 band = local->hw.conf.chandef.chan->band; 1872 break; 1873 #ifdef CONFIG_MAC80211_MESH 1874 case NL80211_IFTYPE_MESH_POINT: 1875 if (!is_multicast_ether_addr(skb->data)) { 1876 struct sta_info *next_hop; 1877 bool mpp_lookup = true; 1878 1879 mpath = mesh_path_lookup(sdata, skb->data); 1880 if (mpath) { 1881 mpp_lookup = false; 1882 next_hop = rcu_dereference(mpath->next_hop); 1883 if (!next_hop || 1884 !(mpath->flags & (MESH_PATH_ACTIVE | 1885 MESH_PATH_RESOLVING))) 1886 mpp_lookup = true; 1887 } 1888 1889 if (mpp_lookup) 1890 mppath = mpp_path_lookup(sdata, skb->data); 1891 1892 if (mppath && mpath) 1893 mesh_path_del(mpath->sdata, mpath->dst); 1894 } 1895 1896 /* 1897 * Use address extension if it is a packet from 1898 * another interface or if we know the destination 1899 * is being proxied by a portal (i.e. portal address 1900 * differs from proxied address) 1901 */ 1902 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1903 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1904 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1905 skb->data, skb->data + ETH_ALEN); 1906 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1907 NULL, NULL); 1908 } else { 1909 /* DS -> MBSS (802.11-2012 13.11.3.3). 1910 * For unicast with unknown forwarding information, 1911 * destination might be in the MBSS or if that fails 1912 * forwarded to another mesh gate. In either case 1913 * resolution will be handled in ieee80211_xmit(), so 1914 * leave the original DA. This also works for mcast */ 1915 const u8 *mesh_da = skb->data; 1916 1917 if (mppath) 1918 mesh_da = mppath->mpp; 1919 else if (mpath) 1920 mesh_da = mpath->dst; 1921 1922 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1923 mesh_da, sdata->vif.addr); 1924 if (is_multicast_ether_addr(mesh_da)) 1925 /* DA TA mSA AE:SA */ 1926 meshhdrlen = ieee80211_new_mesh_header( 1927 sdata, &mesh_hdr, 1928 skb->data + ETH_ALEN, NULL); 1929 else 1930 /* RA TA mDA mSA AE:DA SA */ 1931 meshhdrlen = ieee80211_new_mesh_header( 1932 sdata, &mesh_hdr, skb->data, 1933 skb->data + ETH_ALEN); 1934 1935 } 1936 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1937 if (!chanctx_conf) 1938 goto fail_rcu; 1939 band = chanctx_conf->def.chan->band; 1940 break; 1941 #endif 1942 case NL80211_IFTYPE_STATION: 1943 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1944 bool tdls_peer = false; 1945 1946 sta = sta_info_get(sdata, skb->data); 1947 if (sta) { 1948 authorized = test_sta_flag(sta, 1949 WLAN_STA_AUTHORIZED); 1950 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1951 tdls_peer = test_sta_flag(sta, 1952 WLAN_STA_TDLS_PEER); 1953 tdls_auth = test_sta_flag(sta, 1954 WLAN_STA_TDLS_PEER_AUTH); 1955 } 1956 1957 /* 1958 * If the TDLS link is enabled, send everything 1959 * directly. Otherwise, allow TDLS setup frames 1960 * to be transmitted indirectly. 1961 */ 1962 tdls_direct = tdls_peer && (tdls_auth || 1963 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1964 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1965 } 1966 1967 if (tdls_direct) { 1968 /* link during setup - throw out frames to peer */ 1969 if (!tdls_auth) 1970 goto fail_rcu; 1971 1972 /* DA SA BSSID */ 1973 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1974 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1975 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1976 hdrlen = 24; 1977 } else if (sdata->u.mgd.use_4addr && 1978 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1979 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1980 IEEE80211_FCTL_TODS); 1981 /* RA TA DA SA */ 1982 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1983 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1984 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1985 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1986 hdrlen = 30; 1987 } else { 1988 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1989 /* BSSID SA DA */ 1990 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1991 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1992 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1993 hdrlen = 24; 1994 } 1995 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1996 if (!chanctx_conf) 1997 goto fail_rcu; 1998 band = chanctx_conf->def.chan->band; 1999 break; 2000 case NL80211_IFTYPE_ADHOC: 2001 /* DA SA BSSID */ 2002 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2003 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2004 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2005 hdrlen = 24; 2006 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2007 if (!chanctx_conf) 2008 goto fail_rcu; 2009 band = chanctx_conf->def.chan->band; 2010 break; 2011 default: 2012 goto fail_rcu; 2013 } 2014 2015 /* 2016 * There's no need to try to look up the destination 2017 * if it is a multicast address (which can only happen 2018 * in AP mode) 2019 */ 2020 multicast = is_multicast_ether_addr(hdr.addr1); 2021 if (!multicast) { 2022 sta = sta_info_get(sdata, hdr.addr1); 2023 if (sta) { 2024 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2025 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 2026 } 2027 } 2028 2029 /* For mesh, the use of the QoS header is mandatory */ 2030 if (ieee80211_vif_is_mesh(&sdata->vif)) 2031 wme_sta = true; 2032 2033 /* receiver and we are QoS enabled, use a QoS type frame */ 2034 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 2035 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2036 hdrlen += 2; 2037 } 2038 2039 /* 2040 * Drop unicast frames to unauthorised stations unless they are 2041 * EAPOL frames from the local station. 2042 */ 2043 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2044 !multicast && !authorized && 2045 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2046 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2047 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2048 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2049 dev->name, hdr.addr1); 2050 #endif 2051 2052 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2053 2054 goto fail_rcu; 2055 } 2056 2057 if (unlikely(!multicast && skb->sk && 2058 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2059 struct sk_buff *orig_skb = skb; 2060 2061 skb = skb_clone(skb, GFP_ATOMIC); 2062 if (skb) { 2063 unsigned long flags; 2064 int id; 2065 2066 spin_lock_irqsave(&local->ack_status_lock, flags); 2067 id = idr_alloc(&local->ack_status_frames, orig_skb, 2068 1, 0x10000, GFP_ATOMIC); 2069 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2070 2071 if (id >= 0) { 2072 info_id = id; 2073 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2074 } else if (skb_shared(skb)) { 2075 kfree_skb(orig_skb); 2076 } else { 2077 kfree_skb(skb); 2078 skb = orig_skb; 2079 } 2080 } else { 2081 /* couldn't clone -- lose tx status ... */ 2082 skb = orig_skb; 2083 } 2084 } 2085 2086 /* 2087 * If the skb is shared we need to obtain our own copy. 2088 */ 2089 if (skb_shared(skb)) { 2090 struct sk_buff *tmp_skb = skb; 2091 2092 /* can't happen -- skb is a clone if info_id != 0 */ 2093 WARN_ON(info_id); 2094 2095 skb = skb_clone(skb, GFP_ATOMIC); 2096 kfree_skb(tmp_skb); 2097 2098 if (!skb) 2099 goto fail_rcu; 2100 } 2101 2102 hdr.frame_control = fc; 2103 hdr.duration_id = 0; 2104 hdr.seq_ctrl = 0; 2105 2106 skip_header_bytes = ETH_HLEN; 2107 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2108 encaps_data = bridge_tunnel_header; 2109 encaps_len = sizeof(bridge_tunnel_header); 2110 skip_header_bytes -= 2; 2111 } else if (ethertype >= ETH_P_802_3_MIN) { 2112 encaps_data = rfc1042_header; 2113 encaps_len = sizeof(rfc1042_header); 2114 skip_header_bytes -= 2; 2115 } else { 2116 encaps_data = NULL; 2117 encaps_len = 0; 2118 } 2119 2120 nh_pos = skb_network_header(skb) - skb->data; 2121 h_pos = skb_transport_header(skb) - skb->data; 2122 2123 skb_pull(skb, skip_header_bytes); 2124 nh_pos -= skip_header_bytes; 2125 h_pos -= skip_header_bytes; 2126 2127 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2128 2129 /* 2130 * So we need to modify the skb header and hence need a copy of 2131 * that. The head_need variable above doesn't, so far, include 2132 * the needed header space that we don't need right away. If we 2133 * can, then we don't reallocate right now but only after the 2134 * frame arrives at the master device (if it does...) 2135 * 2136 * If we cannot, however, then we will reallocate to include all 2137 * the ever needed space. Also, if we need to reallocate it anyway, 2138 * make it big enough for everything we may ever need. 2139 */ 2140 2141 if (head_need > 0 || skb_cloned(skb)) { 2142 head_need += sdata->encrypt_headroom; 2143 head_need += local->tx_headroom; 2144 head_need = max_t(int, 0, head_need); 2145 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2146 ieee80211_free_txskb(&local->hw, skb); 2147 skb = NULL; 2148 goto fail_rcu; 2149 } 2150 } 2151 2152 if (encaps_data) { 2153 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2154 nh_pos += encaps_len; 2155 h_pos += encaps_len; 2156 } 2157 2158 #ifdef CONFIG_MAC80211_MESH 2159 if (meshhdrlen > 0) { 2160 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2161 nh_pos += meshhdrlen; 2162 h_pos += meshhdrlen; 2163 } 2164 #endif 2165 2166 if (ieee80211_is_data_qos(fc)) { 2167 __le16 *qos_control; 2168 2169 qos_control = (__le16 *) skb_push(skb, 2); 2170 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2171 /* 2172 * Maybe we could actually set some fields here, for now just 2173 * initialise to zero to indicate no special operation. 2174 */ 2175 *qos_control = 0; 2176 } else 2177 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2178 2179 nh_pos += hdrlen; 2180 h_pos += hdrlen; 2181 2182 dev->stats.tx_packets++; 2183 dev->stats.tx_bytes += skb->len; 2184 2185 /* Update skb pointers to various headers since this modified frame 2186 * is going to go through Linux networking code that may potentially 2187 * need things like pointer to IP header. */ 2188 skb_set_mac_header(skb, 0); 2189 skb_set_network_header(skb, nh_pos); 2190 skb_set_transport_header(skb, h_pos); 2191 2192 info = IEEE80211_SKB_CB(skb); 2193 memset(info, 0, sizeof(*info)); 2194 2195 dev->trans_start = jiffies; 2196 2197 info->flags = info_flags; 2198 info->ack_frame_id = info_id; 2199 2200 ieee80211_xmit(sdata, skb, band); 2201 rcu_read_unlock(); 2202 2203 return NETDEV_TX_OK; 2204 2205 fail_rcu: 2206 rcu_read_unlock(); 2207 fail: 2208 dev_kfree_skb(skb); 2209 return NETDEV_TX_OK; 2210 } 2211 2212 2213 /* 2214 * ieee80211_clear_tx_pending may not be called in a context where 2215 * it is possible that it packets could come in again. 2216 */ 2217 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2218 { 2219 struct sk_buff *skb; 2220 int i; 2221 2222 for (i = 0; i < local->hw.queues; i++) { 2223 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2224 ieee80211_free_txskb(&local->hw, skb); 2225 } 2226 } 2227 2228 /* 2229 * Returns false if the frame couldn't be transmitted but was queued instead, 2230 * which in this case means re-queued -- take as an indication to stop sending 2231 * more pending frames. 2232 */ 2233 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2234 struct sk_buff *skb) 2235 { 2236 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2237 struct ieee80211_sub_if_data *sdata; 2238 struct sta_info *sta; 2239 struct ieee80211_hdr *hdr; 2240 bool result; 2241 struct ieee80211_chanctx_conf *chanctx_conf; 2242 2243 sdata = vif_to_sdata(info->control.vif); 2244 2245 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2246 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2247 if (unlikely(!chanctx_conf)) { 2248 dev_kfree_skb(skb); 2249 return true; 2250 } 2251 result = ieee80211_tx(sdata, skb, true, 2252 chanctx_conf->def.chan->band); 2253 } else { 2254 struct sk_buff_head skbs; 2255 2256 __skb_queue_head_init(&skbs); 2257 __skb_queue_tail(&skbs, skb); 2258 2259 hdr = (struct ieee80211_hdr *)skb->data; 2260 sta = sta_info_get(sdata, hdr->addr1); 2261 2262 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2263 } 2264 2265 return result; 2266 } 2267 2268 /* 2269 * Transmit all pending packets. Called from tasklet. 2270 */ 2271 void ieee80211_tx_pending(unsigned long data) 2272 { 2273 struct ieee80211_local *local = (struct ieee80211_local *)data; 2274 unsigned long flags; 2275 int i; 2276 bool txok; 2277 2278 rcu_read_lock(); 2279 2280 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2281 for (i = 0; i < local->hw.queues; i++) { 2282 /* 2283 * If queue is stopped by something other than due to pending 2284 * frames, or we have no pending frames, proceed to next queue. 2285 */ 2286 if (local->queue_stop_reasons[i] || 2287 skb_queue_empty(&local->pending[i])) 2288 continue; 2289 2290 while (!skb_queue_empty(&local->pending[i])) { 2291 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2292 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2293 2294 if (WARN_ON(!info->control.vif)) { 2295 ieee80211_free_txskb(&local->hw, skb); 2296 continue; 2297 } 2298 2299 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2300 flags); 2301 2302 txok = ieee80211_tx_pending_skb(local, skb); 2303 spin_lock_irqsave(&local->queue_stop_reason_lock, 2304 flags); 2305 if (!txok) 2306 break; 2307 } 2308 2309 if (skb_queue_empty(&local->pending[i])) 2310 ieee80211_propagate_queue_wake(local, i); 2311 } 2312 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2313 2314 rcu_read_unlock(); 2315 } 2316 2317 /* functions for drivers to get certain frames */ 2318 2319 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2320 struct ps_data *ps, struct sk_buff *skb) 2321 { 2322 u8 *pos, *tim; 2323 int aid0 = 0; 2324 int i, have_bits = 0, n1, n2; 2325 2326 /* Generate bitmap for TIM only if there are any STAs in power save 2327 * mode. */ 2328 if (atomic_read(&ps->num_sta_ps) > 0) 2329 /* in the hope that this is faster than 2330 * checking byte-for-byte */ 2331 have_bits = !bitmap_empty((unsigned long *)ps->tim, 2332 IEEE80211_MAX_AID+1); 2333 2334 if (ps->dtim_count == 0) 2335 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2336 else 2337 ps->dtim_count--; 2338 2339 tim = pos = (u8 *) skb_put(skb, 6); 2340 *pos++ = WLAN_EID_TIM; 2341 *pos++ = 4; 2342 *pos++ = ps->dtim_count; 2343 *pos++ = sdata->vif.bss_conf.dtim_period; 2344 2345 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2346 aid0 = 1; 2347 2348 ps->dtim_bc_mc = aid0 == 1; 2349 2350 if (have_bits) { 2351 /* Find largest even number N1 so that bits numbered 1 through 2352 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2353 * (N2 + 1) x 8 through 2007 are 0. */ 2354 n1 = 0; 2355 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2356 if (ps->tim[i]) { 2357 n1 = i & 0xfe; 2358 break; 2359 } 2360 } 2361 n2 = n1; 2362 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2363 if (ps->tim[i]) { 2364 n2 = i; 2365 break; 2366 } 2367 } 2368 2369 /* Bitmap control */ 2370 *pos++ = n1 | aid0; 2371 /* Part Virt Bitmap */ 2372 skb_put(skb, n2 - n1); 2373 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2374 2375 tim[1] = n2 - n1 + 4; 2376 } else { 2377 *pos++ = aid0; /* Bitmap control */ 2378 *pos++ = 0; /* Part Virt Bitmap */ 2379 } 2380 } 2381 2382 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2383 struct ps_data *ps, struct sk_buff *skb) 2384 { 2385 struct ieee80211_local *local = sdata->local; 2386 2387 /* 2388 * Not very nice, but we want to allow the driver to call 2389 * ieee80211_beacon_get() as a response to the set_tim() 2390 * callback. That, however, is already invoked under the 2391 * sta_lock to guarantee consistent and race-free update 2392 * of the tim bitmap in mac80211 and the driver. 2393 */ 2394 if (local->tim_in_locked_section) { 2395 __ieee80211_beacon_add_tim(sdata, ps, skb); 2396 } else { 2397 spin_lock_bh(&local->tim_lock); 2398 __ieee80211_beacon_add_tim(sdata, ps, skb); 2399 spin_unlock_bh(&local->tim_lock); 2400 } 2401 2402 return 0; 2403 } 2404 2405 void ieee80211_csa_finish(struct ieee80211_vif *vif) 2406 { 2407 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2408 2409 ieee80211_queue_work(&sdata->local->hw, 2410 &sdata->csa_finalize_work); 2411 } 2412 EXPORT_SYMBOL(ieee80211_csa_finish); 2413 2414 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata, 2415 struct beacon_data *beacon) 2416 { 2417 struct probe_resp *resp; 2418 int counter_offset_beacon = sdata->csa_counter_offset_beacon; 2419 int counter_offset_presp = sdata->csa_counter_offset_presp; 2420 u8 *beacon_data; 2421 size_t beacon_data_len; 2422 2423 switch (sdata->vif.type) { 2424 case NL80211_IFTYPE_AP: 2425 beacon_data = beacon->tail; 2426 beacon_data_len = beacon->tail_len; 2427 break; 2428 case NL80211_IFTYPE_ADHOC: 2429 beacon_data = beacon->head; 2430 beacon_data_len = beacon->head_len; 2431 break; 2432 case NL80211_IFTYPE_MESH_POINT: 2433 beacon_data = beacon->head; 2434 beacon_data_len = beacon->head_len; 2435 break; 2436 default: 2437 return; 2438 } 2439 if (WARN_ON(counter_offset_beacon >= beacon_data_len)) 2440 return; 2441 2442 /* warn if the driver did not check for/react to csa completeness */ 2443 if (WARN_ON(beacon_data[counter_offset_beacon] == 0)) 2444 return; 2445 2446 beacon_data[counter_offset_beacon]--; 2447 2448 if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) { 2449 rcu_read_lock(); 2450 resp = rcu_dereference(sdata->u.ap.probe_resp); 2451 2452 /* if nl80211 accepted the offset, this should not happen. */ 2453 if (WARN_ON(!resp)) { 2454 rcu_read_unlock(); 2455 return; 2456 } 2457 resp->data[counter_offset_presp]--; 2458 rcu_read_unlock(); 2459 } 2460 } 2461 2462 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 2463 { 2464 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2465 struct beacon_data *beacon = NULL; 2466 u8 *beacon_data; 2467 size_t beacon_data_len; 2468 int counter_beacon = sdata->csa_counter_offset_beacon; 2469 int ret = false; 2470 2471 if (!ieee80211_sdata_running(sdata)) 2472 return false; 2473 2474 rcu_read_lock(); 2475 if (vif->type == NL80211_IFTYPE_AP) { 2476 struct ieee80211_if_ap *ap = &sdata->u.ap; 2477 2478 beacon = rcu_dereference(ap->beacon); 2479 if (WARN_ON(!beacon || !beacon->tail)) 2480 goto out; 2481 beacon_data = beacon->tail; 2482 beacon_data_len = beacon->tail_len; 2483 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 2484 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2485 2486 beacon = rcu_dereference(ifibss->presp); 2487 if (!beacon) 2488 goto out; 2489 2490 beacon_data = beacon->head; 2491 beacon_data_len = beacon->head_len; 2492 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 2493 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2494 2495 beacon = rcu_dereference(ifmsh->beacon); 2496 if (!beacon) 2497 goto out; 2498 2499 beacon_data = beacon->head; 2500 beacon_data_len = beacon->head_len; 2501 } else { 2502 WARN_ON(1); 2503 goto out; 2504 } 2505 2506 if (WARN_ON(counter_beacon > beacon_data_len)) 2507 goto out; 2508 2509 if (beacon_data[counter_beacon] == 0) 2510 ret = true; 2511 out: 2512 rcu_read_unlock(); 2513 2514 return ret; 2515 } 2516 EXPORT_SYMBOL(ieee80211_csa_is_complete); 2517 2518 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2519 struct ieee80211_vif *vif, 2520 u16 *tim_offset, u16 *tim_length) 2521 { 2522 struct ieee80211_local *local = hw_to_local(hw); 2523 struct sk_buff *skb = NULL; 2524 struct ieee80211_tx_info *info; 2525 struct ieee80211_sub_if_data *sdata = NULL; 2526 enum ieee80211_band band; 2527 struct ieee80211_tx_rate_control txrc; 2528 struct ieee80211_chanctx_conf *chanctx_conf; 2529 2530 rcu_read_lock(); 2531 2532 sdata = vif_to_sdata(vif); 2533 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2534 2535 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2536 goto out; 2537 2538 if (tim_offset) 2539 *tim_offset = 0; 2540 if (tim_length) 2541 *tim_length = 0; 2542 2543 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2544 struct ieee80211_if_ap *ap = &sdata->u.ap; 2545 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2546 2547 if (beacon) { 2548 if (sdata->vif.csa_active) 2549 ieee80211_update_csa(sdata, beacon); 2550 2551 /* 2552 * headroom, head length, 2553 * tail length and maximum TIM length 2554 */ 2555 skb = dev_alloc_skb(local->tx_headroom + 2556 beacon->head_len + 2557 beacon->tail_len + 256 + 2558 local->hw.extra_beacon_tailroom); 2559 if (!skb) 2560 goto out; 2561 2562 skb_reserve(skb, local->tx_headroom); 2563 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2564 beacon->head_len); 2565 2566 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2567 2568 if (tim_offset) 2569 *tim_offset = beacon->head_len; 2570 if (tim_length) 2571 *tim_length = skb->len - beacon->head_len; 2572 2573 if (beacon->tail) 2574 memcpy(skb_put(skb, beacon->tail_len), 2575 beacon->tail, beacon->tail_len); 2576 } else 2577 goto out; 2578 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2579 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2580 struct ieee80211_hdr *hdr; 2581 struct beacon_data *presp = rcu_dereference(ifibss->presp); 2582 2583 if (!presp) 2584 goto out; 2585 2586 if (sdata->vif.csa_active) 2587 ieee80211_update_csa(sdata, presp); 2588 2589 2590 skb = dev_alloc_skb(local->tx_headroom + presp->head_len + 2591 local->hw.extra_beacon_tailroom); 2592 if (!skb) 2593 goto out; 2594 skb_reserve(skb, local->tx_headroom); 2595 memcpy(skb_put(skb, presp->head_len), presp->head, 2596 presp->head_len); 2597 2598 hdr = (struct ieee80211_hdr *) skb->data; 2599 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2600 IEEE80211_STYPE_BEACON); 2601 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2602 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2603 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2604 2605 if (!bcn) 2606 goto out; 2607 2608 if (sdata->vif.csa_active) 2609 ieee80211_update_csa(sdata, bcn); 2610 2611 if (ifmsh->sync_ops) 2612 ifmsh->sync_ops->adjust_tbtt(sdata, bcn); 2613 2614 skb = dev_alloc_skb(local->tx_headroom + 2615 bcn->head_len + 2616 256 + /* TIM IE */ 2617 bcn->tail_len + 2618 local->hw.extra_beacon_tailroom); 2619 if (!skb) 2620 goto out; 2621 skb_reserve(skb, local->tx_headroom); 2622 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2623 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2624 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2625 } else { 2626 WARN_ON(1); 2627 goto out; 2628 } 2629 2630 band = chanctx_conf->def.chan->band; 2631 2632 info = IEEE80211_SKB_CB(skb); 2633 2634 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2635 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2636 info->band = band; 2637 2638 memset(&txrc, 0, sizeof(txrc)); 2639 txrc.hw = hw; 2640 txrc.sband = local->hw.wiphy->bands[band]; 2641 txrc.bss_conf = &sdata->vif.bss_conf; 2642 txrc.skb = skb; 2643 txrc.reported_rate.idx = -1; 2644 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2645 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2646 txrc.max_rate_idx = -1; 2647 else 2648 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2649 txrc.bss = true; 2650 rate_control_get_rate(sdata, NULL, &txrc); 2651 2652 info->control.vif = vif; 2653 2654 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2655 IEEE80211_TX_CTL_ASSIGN_SEQ | 2656 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2657 out: 2658 rcu_read_unlock(); 2659 return skb; 2660 } 2661 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2662 2663 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2664 struct ieee80211_vif *vif) 2665 { 2666 struct ieee80211_if_ap *ap = NULL; 2667 struct sk_buff *skb = NULL; 2668 struct probe_resp *presp = NULL; 2669 struct ieee80211_hdr *hdr; 2670 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2671 2672 if (sdata->vif.type != NL80211_IFTYPE_AP) 2673 return NULL; 2674 2675 rcu_read_lock(); 2676 2677 ap = &sdata->u.ap; 2678 presp = rcu_dereference(ap->probe_resp); 2679 if (!presp) 2680 goto out; 2681 2682 skb = dev_alloc_skb(presp->len); 2683 if (!skb) 2684 goto out; 2685 2686 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2687 2688 hdr = (struct ieee80211_hdr *) skb->data; 2689 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2690 2691 out: 2692 rcu_read_unlock(); 2693 return skb; 2694 } 2695 EXPORT_SYMBOL(ieee80211_proberesp_get); 2696 2697 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2698 struct ieee80211_vif *vif) 2699 { 2700 struct ieee80211_sub_if_data *sdata; 2701 struct ieee80211_if_managed *ifmgd; 2702 struct ieee80211_pspoll *pspoll; 2703 struct ieee80211_local *local; 2704 struct sk_buff *skb; 2705 2706 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2707 return NULL; 2708 2709 sdata = vif_to_sdata(vif); 2710 ifmgd = &sdata->u.mgd; 2711 local = sdata->local; 2712 2713 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2714 if (!skb) 2715 return NULL; 2716 2717 skb_reserve(skb, local->hw.extra_tx_headroom); 2718 2719 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2720 memset(pspoll, 0, sizeof(*pspoll)); 2721 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2722 IEEE80211_STYPE_PSPOLL); 2723 pspoll->aid = cpu_to_le16(ifmgd->aid); 2724 2725 /* aid in PS-Poll has its two MSBs each set to 1 */ 2726 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2727 2728 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2729 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2730 2731 return skb; 2732 } 2733 EXPORT_SYMBOL(ieee80211_pspoll_get); 2734 2735 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2736 struct ieee80211_vif *vif) 2737 { 2738 struct ieee80211_hdr_3addr *nullfunc; 2739 struct ieee80211_sub_if_data *sdata; 2740 struct ieee80211_if_managed *ifmgd; 2741 struct ieee80211_local *local; 2742 struct sk_buff *skb; 2743 2744 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2745 return NULL; 2746 2747 sdata = vif_to_sdata(vif); 2748 ifmgd = &sdata->u.mgd; 2749 local = sdata->local; 2750 2751 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2752 if (!skb) 2753 return NULL; 2754 2755 skb_reserve(skb, local->hw.extra_tx_headroom); 2756 2757 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2758 sizeof(*nullfunc)); 2759 memset(nullfunc, 0, sizeof(*nullfunc)); 2760 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2761 IEEE80211_STYPE_NULLFUNC | 2762 IEEE80211_FCTL_TODS); 2763 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2764 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2765 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2766 2767 return skb; 2768 } 2769 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2770 2771 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2772 struct ieee80211_vif *vif, 2773 const u8 *ssid, size_t ssid_len, 2774 size_t tailroom) 2775 { 2776 struct ieee80211_sub_if_data *sdata; 2777 struct ieee80211_local *local; 2778 struct ieee80211_hdr_3addr *hdr; 2779 struct sk_buff *skb; 2780 size_t ie_ssid_len; 2781 u8 *pos; 2782 2783 sdata = vif_to_sdata(vif); 2784 local = sdata->local; 2785 ie_ssid_len = 2 + ssid_len; 2786 2787 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2788 ie_ssid_len + tailroom); 2789 if (!skb) 2790 return NULL; 2791 2792 skb_reserve(skb, local->hw.extra_tx_headroom); 2793 2794 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2795 memset(hdr, 0, sizeof(*hdr)); 2796 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2797 IEEE80211_STYPE_PROBE_REQ); 2798 eth_broadcast_addr(hdr->addr1); 2799 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2800 eth_broadcast_addr(hdr->addr3); 2801 2802 pos = skb_put(skb, ie_ssid_len); 2803 *pos++ = WLAN_EID_SSID; 2804 *pos++ = ssid_len; 2805 if (ssid_len) 2806 memcpy(pos, ssid, ssid_len); 2807 pos += ssid_len; 2808 2809 return skb; 2810 } 2811 EXPORT_SYMBOL(ieee80211_probereq_get); 2812 2813 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2814 const void *frame, size_t frame_len, 2815 const struct ieee80211_tx_info *frame_txctl, 2816 struct ieee80211_rts *rts) 2817 { 2818 const struct ieee80211_hdr *hdr = frame; 2819 2820 rts->frame_control = 2821 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2822 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2823 frame_txctl); 2824 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2825 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2826 } 2827 EXPORT_SYMBOL(ieee80211_rts_get); 2828 2829 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2830 const void *frame, size_t frame_len, 2831 const struct ieee80211_tx_info *frame_txctl, 2832 struct ieee80211_cts *cts) 2833 { 2834 const struct ieee80211_hdr *hdr = frame; 2835 2836 cts->frame_control = 2837 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2838 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2839 frame_len, frame_txctl); 2840 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2841 } 2842 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2843 2844 struct sk_buff * 2845 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2846 struct ieee80211_vif *vif) 2847 { 2848 struct ieee80211_local *local = hw_to_local(hw); 2849 struct sk_buff *skb = NULL; 2850 struct ieee80211_tx_data tx; 2851 struct ieee80211_sub_if_data *sdata; 2852 struct ps_data *ps; 2853 struct ieee80211_tx_info *info; 2854 struct ieee80211_chanctx_conf *chanctx_conf; 2855 2856 sdata = vif_to_sdata(vif); 2857 2858 rcu_read_lock(); 2859 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2860 2861 if (!chanctx_conf) 2862 goto out; 2863 2864 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2865 struct beacon_data *beacon = 2866 rcu_dereference(sdata->u.ap.beacon); 2867 2868 if (!beacon || !beacon->head) 2869 goto out; 2870 2871 ps = &sdata->u.ap.ps; 2872 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2873 ps = &sdata->u.mesh.ps; 2874 } else { 2875 goto out; 2876 } 2877 2878 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2879 goto out; /* send buffered bc/mc only after DTIM beacon */ 2880 2881 while (1) { 2882 skb = skb_dequeue(&ps->bc_buf); 2883 if (!skb) 2884 goto out; 2885 local->total_ps_buffered--; 2886 2887 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2888 struct ieee80211_hdr *hdr = 2889 (struct ieee80211_hdr *) skb->data; 2890 /* more buffered multicast/broadcast frames ==> set 2891 * MoreData flag in IEEE 802.11 header to inform PS 2892 * STAs */ 2893 hdr->frame_control |= 2894 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2895 } 2896 2897 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2898 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2899 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2900 break; 2901 dev_kfree_skb_any(skb); 2902 } 2903 2904 info = IEEE80211_SKB_CB(skb); 2905 2906 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2907 info->band = chanctx_conf->def.chan->band; 2908 2909 if (invoke_tx_handlers(&tx)) 2910 skb = NULL; 2911 out: 2912 rcu_read_unlock(); 2913 2914 return skb; 2915 } 2916 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2917 2918 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2919 struct sk_buff *skb, int tid, 2920 enum ieee80211_band band) 2921 { 2922 int ac = ieee802_1d_to_ac[tid & 7]; 2923 2924 skb_set_mac_header(skb, 0); 2925 skb_set_network_header(skb, 0); 2926 skb_set_transport_header(skb, 0); 2927 2928 skb_set_queue_mapping(skb, ac); 2929 skb->priority = tid; 2930 2931 skb->dev = sdata->dev; 2932 2933 /* 2934 * The other path calling ieee80211_xmit is from the tasklet, 2935 * and while we can handle concurrent transmissions locking 2936 * requirements are that we do not come into tx with bhs on. 2937 */ 2938 local_bh_disable(); 2939 ieee80211_xmit(sdata, skb, band); 2940 local_bh_enable(); 2941 } 2942