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