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 <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "led.h" 31 #include "mesh.h" 32 #include "wep.h" 33 #include "wpa.h" 34 #include "wme.h" 35 #include "rate.h" 36 37 /* misc utils */ 38 39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 40 struct sk_buff *skb, int group_addr, 41 int next_frag_len) 42 { 43 int rate, mrate, erp, dur, i, shift = 0; 44 struct ieee80211_rate *txrate; 45 struct ieee80211_local *local = tx->local; 46 struct ieee80211_supported_band *sband; 47 struct ieee80211_hdr *hdr; 48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 49 struct ieee80211_chanctx_conf *chanctx_conf; 50 u32 rate_flags = 0; 51 52 rcu_read_lock(); 53 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 54 if (chanctx_conf) { 55 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 56 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 57 } 58 rcu_read_unlock(); 59 60 /* assume HW handles this */ 61 if (tx->rate.flags & IEEE80211_TX_RC_MCS) 62 return 0; 63 64 /* uh huh? */ 65 if (WARN_ON_ONCE(tx->rate.idx < 0)) 66 return 0; 67 68 sband = local->hw.wiphy->bands[info->band]; 69 txrate = &sband->bitrates[tx->rate.idx]; 70 71 erp = txrate->flags & IEEE80211_RATE_ERP_G; 72 73 /* 74 * data and mgmt (except PS Poll): 75 * - during CFP: 32768 76 * - during contention period: 77 * if addr1 is group address: 0 78 * if more fragments = 0 and addr1 is individual address: time to 79 * transmit one ACK plus SIFS 80 * if more fragments = 1 and addr1 is individual address: time to 81 * transmit next fragment plus 2 x ACK plus 3 x SIFS 82 * 83 * IEEE 802.11, 9.6: 84 * - control response frame (CTS or ACK) shall be transmitted using the 85 * same rate as the immediately previous frame in the frame exchange 86 * sequence, if this rate belongs to the PHY mandatory rates, or else 87 * at the highest possible rate belonging to the PHY rates in the 88 * BSSBasicRateSet 89 */ 90 hdr = (struct ieee80211_hdr *)skb->data; 91 if (ieee80211_is_ctl(hdr->frame_control)) { 92 /* TODO: These control frames are not currently sent by 93 * mac80211, but should they be implemented, this function 94 * needs to be updated to support duration field calculation. 95 * 96 * RTS: time needed to transmit pending data/mgmt frame plus 97 * one CTS frame plus one ACK frame plus 3 x SIFS 98 * CTS: duration of immediately previous RTS minus time 99 * required to transmit CTS and its SIFS 100 * ACK: 0 if immediately previous directed data/mgmt had 101 * more=0, with more=1 duration in ACK frame is duration 102 * from previous frame minus time needed to transmit ACK 103 * and its SIFS 104 * PS Poll: BIT(15) | BIT(14) | aid 105 */ 106 return 0; 107 } 108 109 /* data/mgmt */ 110 if (0 /* FIX: data/mgmt during CFP */) 111 return cpu_to_le16(32768); 112 113 if (group_addr) /* Group address as the destination - no ACK */ 114 return 0; 115 116 /* Individual destination address: 117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 118 * CTS and ACK frames shall be transmitted using the highest rate in 119 * basic rate set that is less than or equal to the rate of the 120 * immediately previous frame and that is using the same modulation 121 * (CCK or OFDM). If no basic rate set matches with these requirements, 122 * the highest mandatory rate of the PHY that is less than or equal to 123 * the rate of the previous frame is used. 124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 125 */ 126 rate = -1; 127 /* use lowest available if everything fails */ 128 mrate = sband->bitrates[0].bitrate; 129 for (i = 0; i < sband->n_bitrates; i++) { 130 struct ieee80211_rate *r = &sband->bitrates[i]; 131 132 if (r->bitrate > txrate->bitrate) 133 break; 134 135 if ((rate_flags & r->flags) != rate_flags) 136 continue; 137 138 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 139 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 140 141 switch (sband->band) { 142 case IEEE80211_BAND_2GHZ: { 143 u32 flag; 144 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 145 flag = IEEE80211_RATE_MANDATORY_G; 146 else 147 flag = IEEE80211_RATE_MANDATORY_B; 148 if (r->flags & flag) 149 mrate = r->bitrate; 150 break; 151 } 152 case IEEE80211_BAND_5GHZ: 153 if (r->flags & IEEE80211_RATE_MANDATORY_A) 154 mrate = r->bitrate; 155 break; 156 case IEEE80211_BAND_60GHZ: 157 /* TODO, for now fall through */ 158 case IEEE80211_NUM_BANDS: 159 WARN_ON(1); 160 break; 161 } 162 } 163 if (rate == -1) { 164 /* No matching basic rate found; use highest suitable mandatory 165 * PHY rate */ 166 rate = DIV_ROUND_UP(mrate, 1 << shift); 167 } 168 169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 170 if (ieee80211_is_data_qos(hdr->frame_control) && 171 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 172 dur = 0; 173 else 174 /* Time needed to transmit ACK 175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 176 * to closest integer */ 177 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 178 tx->sdata->vif.bss_conf.use_short_preamble, 179 shift); 180 181 if (next_frag_len) { 182 /* Frame is fragmented: duration increases with time needed to 183 * transmit next fragment plus ACK and 2 x SIFS. */ 184 dur *= 2; /* ACK + SIFS */ 185 /* next fragment */ 186 dur += ieee80211_frame_duration(sband->band, next_frag_len, 187 txrate->bitrate, erp, 188 tx->sdata->vif.bss_conf.use_short_preamble, 189 shift); 190 } 191 192 return cpu_to_le16(dur); 193 } 194 195 /* tx handlers */ 196 static ieee80211_tx_result debug_noinline 197 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 198 { 199 struct ieee80211_local *local = tx->local; 200 struct ieee80211_if_managed *ifmgd; 201 202 /* driver doesn't support power save */ 203 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 204 return TX_CONTINUE; 205 206 /* hardware does dynamic power save */ 207 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 208 return TX_CONTINUE; 209 210 /* dynamic power save disabled */ 211 if (local->hw.conf.dynamic_ps_timeout <= 0) 212 return TX_CONTINUE; 213 214 /* we are scanning, don't enable power save */ 215 if (local->scanning) 216 return TX_CONTINUE; 217 218 if (!local->ps_sdata) 219 return TX_CONTINUE; 220 221 /* No point if we're going to suspend */ 222 if (local->quiescing) 223 return TX_CONTINUE; 224 225 /* dynamic ps is supported only in managed mode */ 226 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS); 253 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 254 ieee80211_queue_work(&local->hw, 255 &local->dynamic_ps_disable_work); 256 } 257 258 /* Don't restart the timer if we're not disassociated */ 259 if (!ifmgd->associated) 260 return TX_CONTINUE; 261 262 mod_timer(&local->dynamic_ps_timer, jiffies + 263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 264 265 return TX_CONTINUE; 266 } 267 268 static ieee80211_tx_result debug_noinline 269 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 270 { 271 272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 274 bool assoc = false; 275 276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 277 return TX_CONTINUE; 278 279 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 280 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 281 !ieee80211_is_probe_req(hdr->frame_control) && 282 !ieee80211_is_nullfunc(hdr->frame_control)) 283 /* 284 * When software scanning only nullfunc frames (to notify 285 * the sleep state to the AP) and probe requests (for the 286 * active scan) are allowed, all other frames should not be 287 * sent and we should not get here, but if we do 288 * nonetheless, drop them to avoid sending them 289 * off-channel. See the link below and 290 * ieee80211_start_scan() for more. 291 * 292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 293 */ 294 return TX_DROP; 295 296 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 297 return TX_CONTINUE; 298 299 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 300 return TX_CONTINUE; 301 302 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 303 return TX_CONTINUE; 304 305 if (tx->sta) 306 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 307 308 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 309 if (unlikely(!assoc && 310 ieee80211_is_data(hdr->frame_control))) { 311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 312 sdata_info(tx->sdata, 313 "dropped data frame to not associated station %pM\n", 314 hdr->addr1); 315 #endif 316 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 317 return TX_DROP; 318 } 319 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 320 ieee80211_is_data(hdr->frame_control) && 321 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 322 /* 323 * No associated STAs - no need to send multicast 324 * frames. 325 */ 326 return TX_DROP; 327 } 328 329 return TX_CONTINUE; 330 } 331 332 /* This function is called whenever the AP is about to exceed the maximum limit 333 * of buffered frames for power saving STAs. This situation should not really 334 * happen often during normal operation, so dropping the oldest buffered packet 335 * from each queue should be OK to make some room for new frames. */ 336 static void purge_old_ps_buffers(struct ieee80211_local *local) 337 { 338 int total = 0, purged = 0; 339 struct sk_buff *skb; 340 struct ieee80211_sub_if_data *sdata; 341 struct sta_info *sta; 342 343 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 344 struct ps_data *ps; 345 346 if (sdata->vif.type == NL80211_IFTYPE_AP) 347 ps = &sdata->u.ap.ps; 348 else if (ieee80211_vif_is_mesh(&sdata->vif)) 349 ps = &sdata->u.mesh.ps; 350 else 351 continue; 352 353 skb = skb_dequeue(&ps->bc_buf); 354 if (skb) { 355 purged++; 356 dev_kfree_skb(skb); 357 } 358 total += skb_queue_len(&ps->bc_buf); 359 } 360 361 /* 362 * Drop one frame from each station from the lowest-priority 363 * AC that has frames at all. 364 */ 365 list_for_each_entry_rcu(sta, &local->sta_list, list) { 366 int ac; 367 368 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 369 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 370 total += skb_queue_len(&sta->ps_tx_buf[ac]); 371 if (skb) { 372 purged++; 373 ieee80211_free_txskb(&local->hw, skb); 374 break; 375 } 376 } 377 } 378 379 local->total_ps_buffered = total; 380 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 381 } 382 383 static ieee80211_tx_result 384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 385 { 386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 388 struct ps_data *ps; 389 390 /* 391 * broadcast/multicast frame 392 * 393 * If any of the associated/peer stations is in power save mode, 394 * the frame is buffered to be sent after DTIM beacon frame. 395 * This is done either by the hardware or us. 396 */ 397 398 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 399 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 400 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 401 if (!tx->sdata->bss) 402 return TX_CONTINUE; 403 404 ps = &tx->sdata->bss->ps; 405 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 406 ps = &tx->sdata->u.mesh.ps; 407 } else { 408 return TX_CONTINUE; 409 } 410 411 412 /* no buffering for ordered frames */ 413 if (ieee80211_has_order(hdr->frame_control)) 414 return TX_CONTINUE; 415 416 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 417 info->hw_queue = tx->sdata->vif.cab_queue; 418 419 /* no stations in PS mode */ 420 if (!atomic_read(&ps->num_sta_ps)) 421 return TX_CONTINUE; 422 423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 424 425 /* device releases frame after DTIM beacon */ 426 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 427 return TX_CONTINUE; 428 429 /* buffered in mac80211 */ 430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 431 purge_old_ps_buffers(tx->local); 432 433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 434 ps_dbg(tx->sdata, 435 "BC TX buffer full - dropping the oldest frame\n"); 436 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 437 } else 438 tx->local->total_ps_buffered++; 439 440 skb_queue_tail(&ps->bc_buf, tx->skb); 441 442 return TX_QUEUED; 443 } 444 445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 446 struct sk_buff *skb) 447 { 448 if (!ieee80211_is_mgmt(fc)) 449 return 0; 450 451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 452 return 0; 453 454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 455 skb->data)) 456 return 0; 457 458 return 1; 459 } 460 461 static ieee80211_tx_result 462 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 463 { 464 struct sta_info *sta = tx->sta; 465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 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 /* only deauth, disassoc and action are bufferable MMPDUs */ 478 if (ieee80211_is_mgmt(hdr->frame_control) && 479 !ieee80211_is_deauth(hdr->frame_control) && 480 !ieee80211_is_disassoc(hdr->frame_control) && 481 !ieee80211_is_action(hdr->frame_control)) { 482 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 483 return TX_CONTINUE; 484 } 485 486 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 487 sta->sta.addr, sta->sta.aid, ac); 488 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 489 purge_old_ps_buffers(tx->local); 490 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 491 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 492 ps_dbg(tx->sdata, 493 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 494 sta->sta.addr, ac); 495 ieee80211_free_txskb(&local->hw, old); 496 } else 497 tx->local->total_ps_buffered++; 498 499 info->control.jiffies = jiffies; 500 info->control.vif = &tx->sdata->vif; 501 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 502 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 503 504 if (!timer_pending(&local->sta_cleanup)) 505 mod_timer(&local->sta_cleanup, 506 round_jiffies(jiffies + 507 STA_INFO_CLEANUP_INTERVAL)); 508 509 /* 510 * We queued up some frames, so the TIM bit might 511 * need to be set, recalculate it. 512 */ 513 sta_info_recalc_tim(sta); 514 515 return TX_QUEUED; 516 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 517 ps_dbg(tx->sdata, 518 "STA %pM in PS mode, but polling/in SP -> send frame\n", 519 sta->sta.addr); 520 } 521 522 return TX_CONTINUE; 523 } 524 525 static ieee80211_tx_result debug_noinline 526 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 527 { 528 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 529 return TX_CONTINUE; 530 531 if (tx->flags & IEEE80211_TX_UNICAST) 532 return ieee80211_tx_h_unicast_ps_buf(tx); 533 else 534 return ieee80211_tx_h_multicast_ps_buf(tx); 535 } 536 537 static ieee80211_tx_result debug_noinline 538 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 539 { 540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 541 542 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 543 if (tx->sdata->control_port_no_encrypt) 544 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 545 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 546 } 547 548 return TX_CONTINUE; 549 } 550 551 static ieee80211_tx_result debug_noinline 552 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 553 { 554 struct ieee80211_key *key; 555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 557 558 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 559 tx->key = NULL; 560 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 561 tx->key = key; 562 else if (ieee80211_is_mgmt(hdr->frame_control) && 563 is_multicast_ether_addr(hdr->addr1) && 564 ieee80211_is_robust_mgmt_frame(hdr) && 565 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 566 tx->key = key; 567 else if (is_multicast_ether_addr(hdr->addr1) && 568 (key = rcu_dereference(tx->sdata->default_multicast_key))) 569 tx->key = key; 570 else if (!is_multicast_ether_addr(hdr->addr1) && 571 (key = rcu_dereference(tx->sdata->default_unicast_key))) 572 tx->key = key; 573 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 574 tx->key = NULL; 575 else if (!tx->sdata->drop_unencrypted) 576 tx->key = NULL; 577 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 578 tx->key = NULL; 579 else if (ieee80211_is_robust_mgmt_frame(hdr) && 580 !(ieee80211_is_action(hdr->frame_control) && 581 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 582 tx->key = NULL; 583 else if (ieee80211_is_mgmt(hdr->frame_control) && 584 !ieee80211_is_robust_mgmt_frame(hdr)) 585 tx->key = NULL; 586 else { 587 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 588 return TX_DROP; 589 } 590 591 if (tx->key) { 592 bool skip_hw = false; 593 594 tx->key->tx_rx_count++; 595 /* TODO: add threshold stuff again */ 596 597 switch (tx->key->conf.cipher) { 598 case WLAN_CIPHER_SUITE_WEP40: 599 case WLAN_CIPHER_SUITE_WEP104: 600 case WLAN_CIPHER_SUITE_TKIP: 601 if (!ieee80211_is_data_present(hdr->frame_control)) 602 tx->key = NULL; 603 break; 604 case WLAN_CIPHER_SUITE_CCMP: 605 if (!ieee80211_is_data_present(hdr->frame_control) && 606 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 607 tx->skb)) 608 tx->key = NULL; 609 else 610 skip_hw = (tx->key->conf.flags & 611 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 612 ieee80211_is_mgmt(hdr->frame_control); 613 break; 614 case WLAN_CIPHER_SUITE_AES_CMAC: 615 if (!ieee80211_is_mgmt(hdr->frame_control)) 616 tx->key = NULL; 617 break; 618 } 619 620 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 621 !ieee80211_is_deauth(hdr->frame_control))) 622 return TX_DROP; 623 624 if (!skip_hw && tx->key && 625 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 626 info->control.hw_key = &tx->key->conf; 627 } 628 629 return TX_CONTINUE; 630 } 631 632 static ieee80211_tx_result debug_noinline 633 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 634 { 635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 636 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 637 struct ieee80211_supported_band *sband; 638 u32 len; 639 struct ieee80211_tx_rate_control txrc; 640 struct ieee80211_sta_rates *ratetbl = NULL; 641 bool assoc = false; 642 643 memset(&txrc, 0, sizeof(txrc)); 644 645 sband = tx->local->hw.wiphy->bands[info->band]; 646 647 len = min_t(u32, tx->skb->len + FCS_LEN, 648 tx->local->hw.wiphy->frag_threshold); 649 650 /* set up the tx rate control struct we give the RC algo */ 651 txrc.hw = &tx->local->hw; 652 txrc.sband = sband; 653 txrc.bss_conf = &tx->sdata->vif.bss_conf; 654 txrc.skb = tx->skb; 655 txrc.reported_rate.idx = -1; 656 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 657 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 658 txrc.max_rate_idx = -1; 659 else 660 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 661 662 if (tx->sdata->rc_has_mcs_mask[info->band]) 663 txrc.rate_idx_mcs_mask = 664 tx->sdata->rc_rateidx_mcs_mask[info->band]; 665 666 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 667 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 668 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 669 670 /* set up RTS protection if desired */ 671 if (len > tx->local->hw.wiphy->rts_threshold) { 672 txrc.rts = true; 673 } 674 675 info->control.use_rts = txrc.rts; 676 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 677 678 /* 679 * Use short preamble if the BSS can handle it, but not for 680 * management frames unless we know the receiver can handle 681 * that -- the management frame might be to a station that 682 * just wants a probe response. 683 */ 684 if (tx->sdata->vif.bss_conf.use_short_preamble && 685 (ieee80211_is_data(hdr->frame_control) || 686 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 687 txrc.short_preamble = true; 688 689 info->control.short_preamble = txrc.short_preamble; 690 691 if (tx->sta) 692 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 693 694 /* 695 * Lets not bother rate control if we're associated and cannot 696 * talk to the sta. This should not happen. 697 */ 698 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 699 !rate_usable_index_exists(sband, &tx->sta->sta), 700 "%s: Dropped data frame as no usable bitrate found while " 701 "scanning and associated. Target station: " 702 "%pM on %d GHz band\n", 703 tx->sdata->name, hdr->addr1, 704 info->band ? 5 : 2)) 705 return TX_DROP; 706 707 /* 708 * If we're associated with the sta at this point we know we can at 709 * least send the frame at the lowest bit rate. 710 */ 711 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 712 713 if (tx->sta && !info->control.skip_table) 714 ratetbl = rcu_dereference(tx->sta->sta.rates); 715 716 if (unlikely(info->control.rates[0].idx < 0)) { 717 if (ratetbl) { 718 struct ieee80211_tx_rate rate = { 719 .idx = ratetbl->rate[0].idx, 720 .flags = ratetbl->rate[0].flags, 721 .count = ratetbl->rate[0].count 722 }; 723 724 if (ratetbl->rate[0].idx < 0) 725 return TX_DROP; 726 727 tx->rate = rate; 728 } else { 729 return TX_DROP; 730 } 731 } else { 732 tx->rate = info->control.rates[0]; 733 } 734 735 if (txrc.reported_rate.idx < 0) { 736 txrc.reported_rate = tx->rate; 737 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 738 tx->sta->last_tx_rate = txrc.reported_rate; 739 } else if (tx->sta) 740 tx->sta->last_tx_rate = txrc.reported_rate; 741 742 if (ratetbl) 743 return TX_CONTINUE; 744 745 if (unlikely(!info->control.rates[0].count)) 746 info->control.rates[0].count = 1; 747 748 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 749 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 750 info->control.rates[0].count = 1; 751 752 return TX_CONTINUE; 753 } 754 755 static ieee80211_tx_result debug_noinline 756 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 757 { 758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 760 u16 *seq; 761 u8 *qc; 762 int tid; 763 764 /* 765 * Packet injection may want to control the sequence 766 * number, if we have no matching interface then we 767 * neither assign one ourselves nor ask the driver to. 768 */ 769 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 770 return TX_CONTINUE; 771 772 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 773 return TX_CONTINUE; 774 775 if (ieee80211_hdrlen(hdr->frame_control) < 24) 776 return TX_CONTINUE; 777 778 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 779 return TX_CONTINUE; 780 781 /* 782 * Anything but QoS data that has a sequence number field 783 * (is long enough) gets a sequence number from the global 784 * counter. QoS data frames with a multicast destination 785 * also use the global counter (802.11-2012 9.3.2.10). 786 */ 787 if (!ieee80211_is_data_qos(hdr->frame_control) || 788 is_multicast_ether_addr(hdr->addr1)) { 789 /* driver should assign sequence number */ 790 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 791 /* for pure STA mode without beacons, we can do it */ 792 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 793 tx->sdata->sequence_number += 0x10; 794 return TX_CONTINUE; 795 } 796 797 /* 798 * This should be true for injected/management frames only, for 799 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 800 * above since they are not QoS-data frames. 801 */ 802 if (!tx->sta) 803 return TX_CONTINUE; 804 805 /* include per-STA, per-TID sequence counter */ 806 807 qc = ieee80211_get_qos_ctl(hdr); 808 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 809 seq = &tx->sta->tid_seq[tid]; 810 811 hdr->seq_ctrl = cpu_to_le16(*seq); 812 813 /* Increase the sequence number. */ 814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 815 816 return TX_CONTINUE; 817 } 818 819 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 820 struct sk_buff *skb, int hdrlen, 821 int frag_threshold) 822 { 823 struct ieee80211_local *local = tx->local; 824 struct ieee80211_tx_info *info; 825 struct sk_buff *tmp; 826 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 827 int pos = hdrlen + per_fragm; 828 int rem = skb->len - hdrlen - per_fragm; 829 830 if (WARN_ON(rem < 0)) 831 return -EINVAL; 832 833 /* first fragment was already added to queue by caller */ 834 835 while (rem) { 836 int fraglen = per_fragm; 837 838 if (fraglen > rem) 839 fraglen = rem; 840 rem -= fraglen; 841 tmp = dev_alloc_skb(local->tx_headroom + 842 frag_threshold + 843 IEEE80211_ENCRYPT_HEADROOM + 844 IEEE80211_ENCRYPT_TAILROOM); 845 if (!tmp) 846 return -ENOMEM; 847 848 __skb_queue_tail(&tx->skbs, tmp); 849 850 skb_reserve(tmp, local->tx_headroom + 851 IEEE80211_ENCRYPT_HEADROOM); 852 /* copy control information */ 853 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 854 855 info = IEEE80211_SKB_CB(tmp); 856 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 857 IEEE80211_TX_CTL_FIRST_FRAGMENT); 858 859 if (rem) 860 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 861 862 skb_copy_queue_mapping(tmp, skb); 863 tmp->priority = skb->priority; 864 tmp->dev = skb->dev; 865 866 /* copy header and data */ 867 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 868 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 869 870 pos += fraglen; 871 } 872 873 /* adjust first fragment's length */ 874 skb->len = hdrlen + per_fragm; 875 return 0; 876 } 877 878 static ieee80211_tx_result debug_noinline 879 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 880 { 881 struct sk_buff *skb = tx->skb; 882 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 883 struct ieee80211_hdr *hdr = (void *)skb->data; 884 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 885 int hdrlen; 886 int fragnum; 887 888 /* no matter what happens, tx->skb moves to tx->skbs */ 889 __skb_queue_tail(&tx->skbs, skb); 890 tx->skb = NULL; 891 892 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 893 return TX_CONTINUE; 894 895 if (tx->local->ops->set_frag_threshold) 896 return TX_CONTINUE; 897 898 /* 899 * Warn when submitting a fragmented A-MPDU frame and drop it. 900 * This scenario is handled in ieee80211_tx_prepare but extra 901 * caution taken here as fragmented ampdu may cause Tx stop. 902 */ 903 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 904 return TX_DROP; 905 906 hdrlen = ieee80211_hdrlen(hdr->frame_control); 907 908 /* internal error, why isn't DONTFRAG set? */ 909 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 910 return TX_DROP; 911 912 /* 913 * Now fragment the frame. This will allocate all the fragments and 914 * chain them (using skb as the first fragment) to skb->next. 915 * During transmission, we will remove the successfully transmitted 916 * fragments from this list. When the low-level driver rejects one 917 * of the fragments then we will simply pretend to accept the skb 918 * but store it away as pending. 919 */ 920 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 921 return TX_DROP; 922 923 /* update duration/seq/flags of fragments */ 924 fragnum = 0; 925 926 skb_queue_walk(&tx->skbs, skb) { 927 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 928 929 hdr = (void *)skb->data; 930 info = IEEE80211_SKB_CB(skb); 931 932 if (!skb_queue_is_last(&tx->skbs, skb)) { 933 hdr->frame_control |= morefrags; 934 /* 935 * No multi-rate retries for fragmented frames, that 936 * would completely throw off the NAV at other STAs. 937 */ 938 info->control.rates[1].idx = -1; 939 info->control.rates[2].idx = -1; 940 info->control.rates[3].idx = -1; 941 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 942 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 943 } else { 944 hdr->frame_control &= ~morefrags; 945 } 946 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 947 fragnum++; 948 } 949 950 return TX_CONTINUE; 951 } 952 953 static ieee80211_tx_result debug_noinline 954 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 955 { 956 struct sk_buff *skb; 957 int ac = -1; 958 959 if (!tx->sta) 960 return TX_CONTINUE; 961 962 skb_queue_walk(&tx->skbs, skb) { 963 ac = skb_get_queue_mapping(skb); 964 tx->sta->tx_fragments++; 965 tx->sta->tx_bytes[ac] += skb->len; 966 } 967 if (ac >= 0) 968 tx->sta->tx_packets[ac]++; 969 970 return TX_CONTINUE; 971 } 972 973 static ieee80211_tx_result debug_noinline 974 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 975 { 976 if (!tx->key) 977 return TX_CONTINUE; 978 979 switch (tx->key->conf.cipher) { 980 case WLAN_CIPHER_SUITE_WEP40: 981 case WLAN_CIPHER_SUITE_WEP104: 982 return ieee80211_crypto_wep_encrypt(tx); 983 case WLAN_CIPHER_SUITE_TKIP: 984 return ieee80211_crypto_tkip_encrypt(tx); 985 case WLAN_CIPHER_SUITE_CCMP: 986 return ieee80211_crypto_ccmp_encrypt(tx); 987 case WLAN_CIPHER_SUITE_AES_CMAC: 988 return ieee80211_crypto_aes_cmac_encrypt(tx); 989 default: 990 return ieee80211_crypto_hw_encrypt(tx); 991 } 992 993 return TX_DROP; 994 } 995 996 static ieee80211_tx_result debug_noinline 997 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 998 { 999 struct sk_buff *skb; 1000 struct ieee80211_hdr *hdr; 1001 int next_len; 1002 bool group_addr; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 hdr = (void *) skb->data; 1006 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1007 break; /* must not overwrite AID */ 1008 if (!skb_queue_is_last(&tx->skbs, skb)) { 1009 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1010 next_len = next->len; 1011 } else 1012 next_len = 0; 1013 group_addr = is_multicast_ether_addr(hdr->addr1); 1014 1015 hdr->duration_id = 1016 ieee80211_duration(tx, skb, group_addr, next_len); 1017 } 1018 1019 return TX_CONTINUE; 1020 } 1021 1022 /* actual transmit path */ 1023 1024 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1025 struct sk_buff *skb, 1026 struct ieee80211_tx_info *info, 1027 struct tid_ampdu_tx *tid_tx, 1028 int tid) 1029 { 1030 bool queued = false; 1031 bool reset_agg_timer = false; 1032 struct sk_buff *purge_skb = NULL; 1033 1034 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1035 info->flags |= IEEE80211_TX_CTL_AMPDU; 1036 reset_agg_timer = true; 1037 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1038 /* 1039 * nothing -- this aggregation session is being started 1040 * but that might still fail with the driver 1041 */ 1042 } else { 1043 spin_lock(&tx->sta->lock); 1044 /* 1045 * Need to re-check now, because we may get here 1046 * 1047 * 1) in the window during which the setup is actually 1048 * already done, but not marked yet because not all 1049 * packets are spliced over to the driver pending 1050 * queue yet -- if this happened we acquire the lock 1051 * either before or after the splice happens, but 1052 * need to recheck which of these cases happened. 1053 * 1054 * 2) during session teardown, if the OPERATIONAL bit 1055 * was cleared due to the teardown but the pointer 1056 * hasn't been assigned NULL yet (or we loaded it 1057 * before it was assigned) -- in this case it may 1058 * now be NULL which means we should just let the 1059 * packet pass through because splicing the frames 1060 * back is already done. 1061 */ 1062 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1063 1064 if (!tid_tx) { 1065 /* do nothing, let packet pass through */ 1066 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1067 info->flags |= IEEE80211_TX_CTL_AMPDU; 1068 reset_agg_timer = true; 1069 } else { 1070 queued = true; 1071 info->control.vif = &tx->sdata->vif; 1072 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1073 __skb_queue_tail(&tid_tx->pending, skb); 1074 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1075 purge_skb = __skb_dequeue(&tid_tx->pending); 1076 } 1077 spin_unlock(&tx->sta->lock); 1078 1079 if (purge_skb) 1080 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1081 } 1082 1083 /* reset session timer */ 1084 if (reset_agg_timer && tid_tx->timeout) 1085 tid_tx->last_tx = jiffies; 1086 1087 return queued; 1088 } 1089 1090 /* 1091 * initialises @tx 1092 */ 1093 static ieee80211_tx_result 1094 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1095 struct ieee80211_tx_data *tx, 1096 struct sk_buff *skb) 1097 { 1098 struct ieee80211_local *local = sdata->local; 1099 struct ieee80211_hdr *hdr; 1100 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1101 int tid; 1102 u8 *qc; 1103 1104 memset(tx, 0, sizeof(*tx)); 1105 tx->skb = skb; 1106 tx->local = local; 1107 tx->sdata = sdata; 1108 __skb_queue_head_init(&tx->skbs); 1109 1110 /* 1111 * If this flag is set to true anywhere, and we get here, 1112 * we are doing the needed processing, so remove the flag 1113 * now. 1114 */ 1115 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1116 1117 hdr = (struct ieee80211_hdr *) skb->data; 1118 1119 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1120 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1121 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1122 return TX_DROP; 1123 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1124 tx->sdata->control_port_protocol == tx->skb->protocol) { 1125 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1126 } 1127 if (!tx->sta) 1128 tx->sta = sta_info_get(sdata, hdr->addr1); 1129 1130 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1131 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1132 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1133 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1134 struct tid_ampdu_tx *tid_tx; 1135 1136 qc = ieee80211_get_qos_ctl(hdr); 1137 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1138 1139 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1140 if (tid_tx) { 1141 bool queued; 1142 1143 queued = ieee80211_tx_prep_agg(tx, skb, info, 1144 tid_tx, tid); 1145 1146 if (unlikely(queued)) 1147 return TX_QUEUED; 1148 } 1149 } 1150 1151 if (is_multicast_ether_addr(hdr->addr1)) { 1152 tx->flags &= ~IEEE80211_TX_UNICAST; 1153 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1154 } else 1155 tx->flags |= IEEE80211_TX_UNICAST; 1156 1157 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1158 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1159 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1160 info->flags & IEEE80211_TX_CTL_AMPDU) 1161 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1162 } 1163 1164 if (!tx->sta) 1165 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1166 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1167 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1168 1169 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1170 1171 return TX_CONTINUE; 1172 } 1173 1174 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1175 struct ieee80211_vif *vif, 1176 struct ieee80211_sta *sta, 1177 struct sk_buff_head *skbs, 1178 bool txpending) 1179 { 1180 struct ieee80211_tx_control control; 1181 struct sk_buff *skb, *tmp; 1182 unsigned long flags; 1183 1184 skb_queue_walk_safe(skbs, skb, tmp) { 1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1186 int q = info->hw_queue; 1187 1188 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1189 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1190 __skb_unlink(skb, skbs); 1191 ieee80211_free_txskb(&local->hw, skb); 1192 continue; 1193 } 1194 #endif 1195 1196 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1197 if (local->queue_stop_reasons[q] || 1198 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1199 if (unlikely(info->flags & 1200 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1201 if (local->queue_stop_reasons[q] & 1202 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1203 /* 1204 * Drop off-channel frames if queues 1205 * are stopped for any reason other 1206 * than off-channel operation. Never 1207 * queue them. 1208 */ 1209 spin_unlock_irqrestore( 1210 &local->queue_stop_reason_lock, 1211 flags); 1212 ieee80211_purge_tx_queue(&local->hw, 1213 skbs); 1214 return true; 1215 } 1216 } else { 1217 1218 /* 1219 * Since queue is stopped, queue up frames for 1220 * later transmission from the tx-pending 1221 * tasklet when the queue is woken again. 1222 */ 1223 if (txpending) 1224 skb_queue_splice_init(skbs, 1225 &local->pending[q]); 1226 else 1227 skb_queue_splice_tail_init(skbs, 1228 &local->pending[q]); 1229 1230 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1231 flags); 1232 return false; 1233 } 1234 } 1235 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1236 1237 info->control.vif = vif; 1238 control.sta = sta; 1239 1240 __skb_unlink(skb, skbs); 1241 drv_tx(local, &control, skb); 1242 } 1243 1244 return true; 1245 } 1246 1247 /* 1248 * Returns false if the frame couldn't be transmitted but was queued instead. 1249 */ 1250 static bool __ieee80211_tx(struct ieee80211_local *local, 1251 struct sk_buff_head *skbs, int led_len, 1252 struct sta_info *sta, bool txpending) 1253 { 1254 struct ieee80211_tx_info *info; 1255 struct ieee80211_sub_if_data *sdata; 1256 struct ieee80211_vif *vif; 1257 struct ieee80211_sta *pubsta; 1258 struct sk_buff *skb; 1259 bool result = true; 1260 __le16 fc; 1261 1262 if (WARN_ON(skb_queue_empty(skbs))) 1263 return true; 1264 1265 skb = skb_peek(skbs); 1266 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1267 info = IEEE80211_SKB_CB(skb); 1268 sdata = vif_to_sdata(info->control.vif); 1269 if (sta && !sta->uploaded) 1270 sta = NULL; 1271 1272 if (sta) 1273 pubsta = &sta->sta; 1274 else 1275 pubsta = NULL; 1276 1277 switch (sdata->vif.type) { 1278 case NL80211_IFTYPE_MONITOR: 1279 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1280 vif = &sdata->vif; 1281 break; 1282 } 1283 sdata = rcu_dereference(local->monitor_sdata); 1284 if (sdata) { 1285 vif = &sdata->vif; 1286 info->hw_queue = 1287 vif->hw_queue[skb_get_queue_mapping(skb)]; 1288 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1289 dev_kfree_skb(skb); 1290 return true; 1291 } else 1292 vif = NULL; 1293 break; 1294 case NL80211_IFTYPE_AP_VLAN: 1295 sdata = container_of(sdata->bss, 1296 struct ieee80211_sub_if_data, u.ap); 1297 /* fall through */ 1298 default: 1299 vif = &sdata->vif; 1300 break; 1301 } 1302 1303 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1304 txpending); 1305 1306 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1307 1308 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1309 1310 return result; 1311 } 1312 1313 /* 1314 * Invoke TX handlers, return 0 on success and non-zero if the 1315 * frame was dropped or queued. 1316 */ 1317 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1318 { 1319 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1320 ieee80211_tx_result res = TX_DROP; 1321 1322 #define CALL_TXH(txh) \ 1323 do { \ 1324 res = txh(tx); \ 1325 if (res != TX_CONTINUE) \ 1326 goto txh_done; \ 1327 } while (0) 1328 1329 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1330 CALL_TXH(ieee80211_tx_h_check_assoc); 1331 CALL_TXH(ieee80211_tx_h_ps_buf); 1332 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1333 CALL_TXH(ieee80211_tx_h_select_key); 1334 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1335 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1336 1337 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1338 __skb_queue_tail(&tx->skbs, tx->skb); 1339 tx->skb = NULL; 1340 goto txh_done; 1341 } 1342 1343 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1344 CALL_TXH(ieee80211_tx_h_sequence); 1345 CALL_TXH(ieee80211_tx_h_fragment); 1346 /* handlers after fragment must be aware of tx info fragmentation! */ 1347 CALL_TXH(ieee80211_tx_h_stats); 1348 CALL_TXH(ieee80211_tx_h_encrypt); 1349 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1350 CALL_TXH(ieee80211_tx_h_calculate_duration); 1351 #undef CALL_TXH 1352 1353 txh_done: 1354 if (unlikely(res == TX_DROP)) { 1355 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1356 if (tx->skb) 1357 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1358 else 1359 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1360 return -1; 1361 } else if (unlikely(res == TX_QUEUED)) { 1362 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1363 return -1; 1364 } 1365 1366 return 0; 1367 } 1368 1369 /* 1370 * Returns false if the frame couldn't be transmitted but was queued instead. 1371 */ 1372 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1373 struct sk_buff *skb, bool txpending, 1374 enum ieee80211_band band) 1375 { 1376 struct ieee80211_local *local = sdata->local; 1377 struct ieee80211_tx_data tx; 1378 ieee80211_tx_result res_prepare; 1379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1380 bool result = true; 1381 int led_len; 1382 1383 if (unlikely(skb->len < 10)) { 1384 dev_kfree_skb(skb); 1385 return true; 1386 } 1387 1388 /* initialises tx */ 1389 led_len = skb->len; 1390 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1391 1392 if (unlikely(res_prepare == TX_DROP)) { 1393 ieee80211_free_txskb(&local->hw, skb); 1394 return true; 1395 } else if (unlikely(res_prepare == TX_QUEUED)) { 1396 return true; 1397 } 1398 1399 info->band = band; 1400 1401 /* set up hw_queue value early */ 1402 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1403 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1404 info->hw_queue = 1405 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1406 1407 if (!invoke_tx_handlers(&tx)) 1408 result = __ieee80211_tx(local, &tx.skbs, led_len, 1409 tx.sta, txpending); 1410 1411 return result; 1412 } 1413 1414 /* device xmit handlers */ 1415 1416 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1417 struct sk_buff *skb, 1418 int head_need, bool may_encrypt) 1419 { 1420 struct ieee80211_local *local = sdata->local; 1421 int tail_need = 0; 1422 1423 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1424 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1425 tail_need -= skb_tailroom(skb); 1426 tail_need = max_t(int, tail_need, 0); 1427 } 1428 1429 if (skb_cloned(skb)) 1430 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1431 else if (head_need || tail_need) 1432 I802_DEBUG_INC(local->tx_expand_skb_head); 1433 else 1434 return 0; 1435 1436 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1437 wiphy_debug(local->hw.wiphy, 1438 "failed to reallocate TX buffer\n"); 1439 return -ENOMEM; 1440 } 1441 1442 return 0; 1443 } 1444 1445 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1446 enum ieee80211_band band) 1447 { 1448 struct ieee80211_local *local = sdata->local; 1449 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1451 int headroom; 1452 bool may_encrypt; 1453 1454 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1455 1456 headroom = local->tx_headroom; 1457 if (may_encrypt) 1458 headroom += IEEE80211_ENCRYPT_HEADROOM; 1459 headroom -= skb_headroom(skb); 1460 headroom = max_t(int, 0, headroom); 1461 1462 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1463 ieee80211_free_txskb(&local->hw, skb); 1464 return; 1465 } 1466 1467 hdr = (struct ieee80211_hdr *) skb->data; 1468 info->control.vif = &sdata->vif; 1469 1470 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1471 if (ieee80211_is_data(hdr->frame_control) && 1472 is_unicast_ether_addr(hdr->addr1)) { 1473 if (mesh_nexthop_resolve(sdata, skb)) 1474 return; /* skb queued: don't free */ 1475 } else { 1476 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1477 } 1478 } 1479 1480 ieee80211_set_qos_hdr(sdata, skb); 1481 ieee80211_tx(sdata, skb, false, band); 1482 } 1483 1484 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1485 { 1486 struct ieee80211_radiotap_iterator iterator; 1487 struct ieee80211_radiotap_header *rthdr = 1488 (struct ieee80211_radiotap_header *) skb->data; 1489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1490 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1491 NULL); 1492 u16 txflags; 1493 1494 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1495 IEEE80211_TX_CTL_DONTFRAG; 1496 1497 /* 1498 * for every radiotap entry that is present 1499 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1500 * entries present, or -EINVAL on error) 1501 */ 1502 1503 while (!ret) { 1504 ret = ieee80211_radiotap_iterator_next(&iterator); 1505 1506 if (ret) 1507 continue; 1508 1509 /* see if this argument is something we can use */ 1510 switch (iterator.this_arg_index) { 1511 /* 1512 * You must take care when dereferencing iterator.this_arg 1513 * for multibyte types... the pointer is not aligned. Use 1514 * get_unaligned((type *)iterator.this_arg) to dereference 1515 * iterator.this_arg for type "type" safely on all arches. 1516 */ 1517 case IEEE80211_RADIOTAP_FLAGS: 1518 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1519 /* 1520 * this indicates that the skb we have been 1521 * handed has the 32-bit FCS CRC at the end... 1522 * we should react to that by snipping it off 1523 * because it will be recomputed and added 1524 * on transmission 1525 */ 1526 if (skb->len < (iterator._max_length + FCS_LEN)) 1527 return false; 1528 1529 skb_trim(skb, skb->len - FCS_LEN); 1530 } 1531 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1532 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1533 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1534 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1535 break; 1536 1537 case IEEE80211_RADIOTAP_TX_FLAGS: 1538 txflags = get_unaligned_le16(iterator.this_arg); 1539 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1540 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1541 break; 1542 1543 /* 1544 * Please update the file 1545 * Documentation/networking/mac80211-injection.txt 1546 * when parsing new fields here. 1547 */ 1548 1549 default: 1550 break; 1551 } 1552 } 1553 1554 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1555 return false; 1556 1557 /* 1558 * remove the radiotap header 1559 * iterator->_max_length was sanity-checked against 1560 * skb->len by iterator init 1561 */ 1562 skb_pull(skb, iterator._max_length); 1563 1564 return true; 1565 } 1566 1567 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1568 struct net_device *dev) 1569 { 1570 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1571 struct ieee80211_chanctx_conf *chanctx_conf; 1572 struct ieee80211_channel *chan; 1573 struct ieee80211_radiotap_header *prthdr = 1574 (struct ieee80211_radiotap_header *)skb->data; 1575 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1576 struct ieee80211_hdr *hdr; 1577 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1578 u16 len_rthdr; 1579 int hdrlen; 1580 1581 /* check for not even having the fixed radiotap header part */ 1582 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1583 goto fail; /* too short to be possibly valid */ 1584 1585 /* is it a header version we can trust to find length from? */ 1586 if (unlikely(prthdr->it_version)) 1587 goto fail; /* only version 0 is supported */ 1588 1589 /* then there must be a radiotap header with a length we can use */ 1590 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1591 1592 /* does the skb contain enough to deliver on the alleged length? */ 1593 if (unlikely(skb->len < len_rthdr)) 1594 goto fail; /* skb too short for claimed rt header extent */ 1595 1596 /* 1597 * fix up the pointers accounting for the radiotap 1598 * header still being in there. We are being given 1599 * a precooked IEEE80211 header so no need for 1600 * normal processing 1601 */ 1602 skb_set_mac_header(skb, len_rthdr); 1603 /* 1604 * these are just fixed to the end of the rt area since we 1605 * don't have any better information and at this point, nobody cares 1606 */ 1607 skb_set_network_header(skb, len_rthdr); 1608 skb_set_transport_header(skb, len_rthdr); 1609 1610 if (skb->len < len_rthdr + 2) 1611 goto fail; 1612 1613 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1614 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1615 1616 if (skb->len < len_rthdr + hdrlen) 1617 goto fail; 1618 1619 /* 1620 * Initialize skb->protocol if the injected frame is a data frame 1621 * carrying a rfc1042 header 1622 */ 1623 if (ieee80211_is_data(hdr->frame_control) && 1624 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1625 u8 *payload = (u8 *)hdr + hdrlen; 1626 1627 if (ether_addr_equal(payload, rfc1042_header)) 1628 skb->protocol = cpu_to_be16((payload[6] << 8) | 1629 payload[7]); 1630 } 1631 1632 memset(info, 0, sizeof(*info)); 1633 1634 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1635 IEEE80211_TX_CTL_INJECTED; 1636 1637 /* process and remove the injection radiotap header */ 1638 if (!ieee80211_parse_tx_radiotap(skb)) 1639 goto fail; 1640 1641 rcu_read_lock(); 1642 1643 /* 1644 * We process outgoing injected frames that have a local address 1645 * we handle as though they are non-injected frames. 1646 * This code here isn't entirely correct, the local MAC address 1647 * isn't always enough to find the interface to use; for proper 1648 * VLAN/WDS support we will need a different mechanism (which 1649 * likely isn't going to be monitor interfaces). 1650 */ 1651 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1652 1653 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1654 if (!ieee80211_sdata_running(tmp_sdata)) 1655 continue; 1656 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1657 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1658 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1659 continue; 1660 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1661 sdata = tmp_sdata; 1662 break; 1663 } 1664 } 1665 1666 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1667 if (!chanctx_conf) { 1668 tmp_sdata = rcu_dereference(local->monitor_sdata); 1669 if (tmp_sdata) 1670 chanctx_conf = 1671 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1672 } 1673 1674 if (chanctx_conf) 1675 chan = chanctx_conf->def.chan; 1676 else if (!local->use_chanctx) 1677 chan = local->_oper_chandef.chan; 1678 else 1679 goto fail_rcu; 1680 1681 /* 1682 * Frame injection is not allowed if beaconing is not allowed 1683 * or if we need radar detection. Beaconing is usually not allowed when 1684 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1685 * Passive scan is also used in world regulatory domains where 1686 * your country is not known and as such it should be treated as 1687 * NO TX unless the channel is explicitly allowed in which case 1688 * your current regulatory domain would not have the passive scan 1689 * flag. 1690 * 1691 * Since AP mode uses monitor interfaces to inject/TX management 1692 * frames we can make AP mode the exception to this rule once it 1693 * supports radar detection as its implementation can deal with 1694 * radar detection by itself. We can do that later by adding a 1695 * monitor flag interfaces used for AP support. 1696 */ 1697 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1698 IEEE80211_CHAN_PASSIVE_SCAN))) 1699 goto fail_rcu; 1700 1701 ieee80211_xmit(sdata, skb, chan->band); 1702 rcu_read_unlock(); 1703 1704 return NETDEV_TX_OK; 1705 1706 fail_rcu: 1707 rcu_read_unlock(); 1708 fail: 1709 dev_kfree_skb(skb); 1710 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1711 } 1712 1713 /** 1714 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1715 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1716 * @skb: packet to be sent 1717 * @dev: incoming interface 1718 * 1719 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1720 * not be freed, and caller is responsible for either retrying later or freeing 1721 * skb). 1722 * 1723 * This function takes in an Ethernet header and encapsulates it with suitable 1724 * IEEE 802.11 header based on which interface the packet is coming in. The 1725 * encapsulated packet will then be passed to master interface, wlan#.11, for 1726 * transmission (through low-level driver). 1727 */ 1728 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1729 struct net_device *dev) 1730 { 1731 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1732 struct ieee80211_local *local = sdata->local; 1733 struct ieee80211_tx_info *info; 1734 int head_need; 1735 u16 ethertype, hdrlen, meshhdrlen = 0; 1736 __le16 fc; 1737 struct ieee80211_hdr hdr; 1738 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1739 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1740 const u8 *encaps_data; 1741 int encaps_len, skip_header_bytes; 1742 int nh_pos, h_pos; 1743 struct sta_info *sta = NULL; 1744 bool wme_sta = false, authorized = false, tdls_auth = false; 1745 bool tdls_direct = false; 1746 bool multicast; 1747 u32 info_flags = 0; 1748 u16 info_id = 0; 1749 struct ieee80211_chanctx_conf *chanctx_conf; 1750 struct ieee80211_sub_if_data *ap_sdata; 1751 enum ieee80211_band band; 1752 1753 if (unlikely(skb->len < ETH_HLEN)) 1754 goto fail; 1755 1756 /* convert Ethernet header to proper 802.11 header (based on 1757 * operation mode) */ 1758 ethertype = (skb->data[12] << 8) | skb->data[13]; 1759 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1760 1761 rcu_read_lock(); 1762 1763 switch (sdata->vif.type) { 1764 case NL80211_IFTYPE_AP_VLAN: 1765 sta = rcu_dereference(sdata->u.vlan.sta); 1766 if (sta) { 1767 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1768 /* RA TA DA SA */ 1769 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1770 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1771 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1772 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1773 hdrlen = 30; 1774 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1775 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1776 } 1777 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1778 u.ap); 1779 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1780 if (!chanctx_conf) 1781 goto fail_rcu; 1782 band = chanctx_conf->def.chan->band; 1783 if (sta) 1784 break; 1785 /* fall through */ 1786 case NL80211_IFTYPE_AP: 1787 if (sdata->vif.type == NL80211_IFTYPE_AP) 1788 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1789 if (!chanctx_conf) 1790 goto fail_rcu; 1791 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1792 /* DA BSSID SA */ 1793 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1794 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1795 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1796 hdrlen = 24; 1797 band = chanctx_conf->def.chan->band; 1798 break; 1799 case NL80211_IFTYPE_WDS: 1800 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1801 /* RA TA DA SA */ 1802 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1803 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1804 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1805 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1806 hdrlen = 30; 1807 /* 1808 * This is the exception! WDS style interfaces are prohibited 1809 * when channel contexts are in used so this must be valid 1810 */ 1811 band = local->hw.conf.chandef.chan->band; 1812 break; 1813 #ifdef CONFIG_MAC80211_MESH 1814 case NL80211_IFTYPE_MESH_POINT: 1815 if (!is_multicast_ether_addr(skb->data)) { 1816 struct sta_info *next_hop; 1817 bool mpp_lookup = true; 1818 1819 mpath = mesh_path_lookup(sdata, skb->data); 1820 if (mpath) { 1821 mpp_lookup = false; 1822 next_hop = rcu_dereference(mpath->next_hop); 1823 if (!next_hop || 1824 !(mpath->flags & (MESH_PATH_ACTIVE | 1825 MESH_PATH_RESOLVING))) 1826 mpp_lookup = true; 1827 } 1828 1829 if (mpp_lookup) 1830 mppath = mpp_path_lookup(sdata, skb->data); 1831 1832 if (mppath && mpath) 1833 mesh_path_del(mpath->sdata, mpath->dst); 1834 } 1835 1836 /* 1837 * Use address extension if it is a packet from 1838 * another interface or if we know the destination 1839 * is being proxied by a portal (i.e. portal address 1840 * differs from proxied address) 1841 */ 1842 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1843 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1844 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1845 skb->data, skb->data + ETH_ALEN); 1846 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1847 NULL, NULL); 1848 } else { 1849 /* DS -> MBSS (802.11-2012 13.11.3.3). 1850 * For unicast with unknown forwarding information, 1851 * destination might be in the MBSS or if that fails 1852 * forwarded to another mesh gate. In either case 1853 * resolution will be handled in ieee80211_xmit(), so 1854 * leave the original DA. This also works for mcast */ 1855 const u8 *mesh_da = skb->data; 1856 1857 if (mppath) 1858 mesh_da = mppath->mpp; 1859 else if (mpath) 1860 mesh_da = mpath->dst; 1861 1862 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1863 mesh_da, sdata->vif.addr); 1864 if (is_multicast_ether_addr(mesh_da)) 1865 /* DA TA mSA AE:SA */ 1866 meshhdrlen = ieee80211_new_mesh_header( 1867 sdata, &mesh_hdr, 1868 skb->data + ETH_ALEN, NULL); 1869 else 1870 /* RA TA mDA mSA AE:DA SA */ 1871 meshhdrlen = ieee80211_new_mesh_header( 1872 sdata, &mesh_hdr, skb->data, 1873 skb->data + ETH_ALEN); 1874 1875 } 1876 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1877 if (!chanctx_conf) 1878 goto fail_rcu; 1879 band = chanctx_conf->def.chan->band; 1880 break; 1881 #endif 1882 case NL80211_IFTYPE_STATION: 1883 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1884 bool tdls_peer = false; 1885 1886 sta = sta_info_get(sdata, skb->data); 1887 if (sta) { 1888 authorized = test_sta_flag(sta, 1889 WLAN_STA_AUTHORIZED); 1890 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1891 tdls_peer = test_sta_flag(sta, 1892 WLAN_STA_TDLS_PEER); 1893 tdls_auth = test_sta_flag(sta, 1894 WLAN_STA_TDLS_PEER_AUTH); 1895 } 1896 1897 /* 1898 * If the TDLS link is enabled, send everything 1899 * directly. Otherwise, allow TDLS setup frames 1900 * to be transmitted indirectly. 1901 */ 1902 tdls_direct = tdls_peer && (tdls_auth || 1903 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1904 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1905 } 1906 1907 if (tdls_direct) { 1908 /* link during setup - throw out frames to peer */ 1909 if (!tdls_auth) 1910 goto fail_rcu; 1911 1912 /* DA SA BSSID */ 1913 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1914 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1915 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1916 hdrlen = 24; 1917 } else if (sdata->u.mgd.use_4addr && 1918 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1919 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1920 IEEE80211_FCTL_TODS); 1921 /* RA TA DA SA */ 1922 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1923 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1924 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1925 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1926 hdrlen = 30; 1927 } else { 1928 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1929 /* BSSID SA DA */ 1930 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1931 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1932 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1933 hdrlen = 24; 1934 } 1935 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1936 if (!chanctx_conf) 1937 goto fail_rcu; 1938 band = chanctx_conf->def.chan->band; 1939 break; 1940 case NL80211_IFTYPE_ADHOC: 1941 /* DA SA BSSID */ 1942 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1943 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1944 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1945 hdrlen = 24; 1946 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1947 if (!chanctx_conf) 1948 goto fail_rcu; 1949 band = chanctx_conf->def.chan->band; 1950 break; 1951 default: 1952 goto fail_rcu; 1953 } 1954 1955 /* 1956 * There's no need to try to look up the destination 1957 * if it is a multicast address (which can only happen 1958 * in AP mode) 1959 */ 1960 multicast = is_multicast_ether_addr(hdr.addr1); 1961 if (!multicast) { 1962 sta = sta_info_get(sdata, hdr.addr1); 1963 if (sta) { 1964 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1965 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1966 } 1967 } 1968 1969 /* For mesh, the use of the QoS header is mandatory */ 1970 if (ieee80211_vif_is_mesh(&sdata->vif)) 1971 wme_sta = true; 1972 1973 /* receiver and we are QoS enabled, use a QoS type frame */ 1974 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1975 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1976 hdrlen += 2; 1977 } 1978 1979 /* 1980 * Drop unicast frames to unauthorised stations unless they are 1981 * EAPOL frames from the local station. 1982 */ 1983 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1984 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1985 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1986 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1987 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1988 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 1989 dev->name, hdr.addr1); 1990 #endif 1991 1992 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1993 1994 goto fail_rcu; 1995 } 1996 1997 if (unlikely(!multicast && skb->sk && 1998 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1999 struct sk_buff *orig_skb = skb; 2000 2001 skb = skb_clone(skb, GFP_ATOMIC); 2002 if (skb) { 2003 unsigned long flags; 2004 int id; 2005 2006 spin_lock_irqsave(&local->ack_status_lock, flags); 2007 id = idr_alloc(&local->ack_status_frames, orig_skb, 2008 1, 0x10000, GFP_ATOMIC); 2009 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2010 2011 if (id >= 0) { 2012 info_id = id; 2013 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2014 } else if (skb_shared(skb)) { 2015 kfree_skb(orig_skb); 2016 } else { 2017 kfree_skb(skb); 2018 skb = orig_skb; 2019 } 2020 } else { 2021 /* couldn't clone -- lose tx status ... */ 2022 skb = orig_skb; 2023 } 2024 } 2025 2026 /* 2027 * If the skb is shared we need to obtain our own copy. 2028 */ 2029 if (skb_shared(skb)) { 2030 struct sk_buff *tmp_skb = skb; 2031 2032 /* can't happen -- skb is a clone if info_id != 0 */ 2033 WARN_ON(info_id); 2034 2035 skb = skb_clone(skb, GFP_ATOMIC); 2036 kfree_skb(tmp_skb); 2037 2038 if (!skb) 2039 goto fail_rcu; 2040 } 2041 2042 hdr.frame_control = fc; 2043 hdr.duration_id = 0; 2044 hdr.seq_ctrl = 0; 2045 2046 skip_header_bytes = ETH_HLEN; 2047 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2048 encaps_data = bridge_tunnel_header; 2049 encaps_len = sizeof(bridge_tunnel_header); 2050 skip_header_bytes -= 2; 2051 } else if (ethertype >= ETH_P_802_3_MIN) { 2052 encaps_data = rfc1042_header; 2053 encaps_len = sizeof(rfc1042_header); 2054 skip_header_bytes -= 2; 2055 } else { 2056 encaps_data = NULL; 2057 encaps_len = 0; 2058 } 2059 2060 nh_pos = skb_network_header(skb) - skb->data; 2061 h_pos = skb_transport_header(skb) - skb->data; 2062 2063 skb_pull(skb, skip_header_bytes); 2064 nh_pos -= skip_header_bytes; 2065 h_pos -= skip_header_bytes; 2066 2067 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2068 2069 /* 2070 * So we need to modify the skb header and hence need a copy of 2071 * that. The head_need variable above doesn't, so far, include 2072 * the needed header space that we don't need right away. If we 2073 * can, then we don't reallocate right now but only after the 2074 * frame arrives at the master device (if it does...) 2075 * 2076 * If we cannot, however, then we will reallocate to include all 2077 * the ever needed space. Also, if we need to reallocate it anyway, 2078 * make it big enough for everything we may ever need. 2079 */ 2080 2081 if (head_need > 0 || skb_cloned(skb)) { 2082 head_need += IEEE80211_ENCRYPT_HEADROOM; 2083 head_need += local->tx_headroom; 2084 head_need = max_t(int, 0, head_need); 2085 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2086 ieee80211_free_txskb(&local->hw, skb); 2087 skb = NULL; 2088 goto fail_rcu; 2089 } 2090 } 2091 2092 if (encaps_data) { 2093 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2094 nh_pos += encaps_len; 2095 h_pos += encaps_len; 2096 } 2097 2098 #ifdef CONFIG_MAC80211_MESH 2099 if (meshhdrlen > 0) { 2100 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2101 nh_pos += meshhdrlen; 2102 h_pos += meshhdrlen; 2103 } 2104 #endif 2105 2106 if (ieee80211_is_data_qos(fc)) { 2107 __le16 *qos_control; 2108 2109 qos_control = (__le16*) skb_push(skb, 2); 2110 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2111 /* 2112 * Maybe we could actually set some fields here, for now just 2113 * initialise to zero to indicate no special operation. 2114 */ 2115 *qos_control = 0; 2116 } else 2117 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2118 2119 nh_pos += hdrlen; 2120 h_pos += hdrlen; 2121 2122 dev->stats.tx_packets++; 2123 dev->stats.tx_bytes += skb->len; 2124 2125 /* Update skb pointers to various headers since this modified frame 2126 * is going to go through Linux networking code that may potentially 2127 * need things like pointer to IP header. */ 2128 skb_set_mac_header(skb, 0); 2129 skb_set_network_header(skb, nh_pos); 2130 skb_set_transport_header(skb, h_pos); 2131 2132 info = IEEE80211_SKB_CB(skb); 2133 memset(info, 0, sizeof(*info)); 2134 2135 dev->trans_start = jiffies; 2136 2137 info->flags = info_flags; 2138 info->ack_frame_id = info_id; 2139 2140 ieee80211_xmit(sdata, skb, band); 2141 rcu_read_unlock(); 2142 2143 return NETDEV_TX_OK; 2144 2145 fail_rcu: 2146 rcu_read_unlock(); 2147 fail: 2148 dev_kfree_skb(skb); 2149 return NETDEV_TX_OK; 2150 } 2151 2152 2153 /* 2154 * ieee80211_clear_tx_pending may not be called in a context where 2155 * it is possible that it packets could come in again. 2156 */ 2157 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2158 { 2159 struct sk_buff *skb; 2160 int i; 2161 2162 for (i = 0; i < local->hw.queues; i++) { 2163 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2164 ieee80211_free_txskb(&local->hw, skb); 2165 } 2166 } 2167 2168 /* 2169 * Returns false if the frame couldn't be transmitted but was queued instead, 2170 * which in this case means re-queued -- take as an indication to stop sending 2171 * more pending frames. 2172 */ 2173 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2174 struct sk_buff *skb) 2175 { 2176 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2177 struct ieee80211_sub_if_data *sdata; 2178 struct sta_info *sta; 2179 struct ieee80211_hdr *hdr; 2180 bool result; 2181 struct ieee80211_chanctx_conf *chanctx_conf; 2182 2183 sdata = vif_to_sdata(info->control.vif); 2184 2185 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2186 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2187 if (unlikely(!chanctx_conf)) { 2188 dev_kfree_skb(skb); 2189 return true; 2190 } 2191 result = ieee80211_tx(sdata, skb, true, 2192 chanctx_conf->def.chan->band); 2193 } else { 2194 struct sk_buff_head skbs; 2195 2196 __skb_queue_head_init(&skbs); 2197 __skb_queue_tail(&skbs, skb); 2198 2199 hdr = (struct ieee80211_hdr *)skb->data; 2200 sta = sta_info_get(sdata, hdr->addr1); 2201 2202 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2203 } 2204 2205 return result; 2206 } 2207 2208 /* 2209 * Transmit all pending packets. Called from tasklet. 2210 */ 2211 void ieee80211_tx_pending(unsigned long data) 2212 { 2213 struct ieee80211_local *local = (struct ieee80211_local *)data; 2214 unsigned long flags; 2215 int i; 2216 bool txok; 2217 2218 rcu_read_lock(); 2219 2220 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2221 for (i = 0; i < local->hw.queues; i++) { 2222 /* 2223 * If queue is stopped by something other than due to pending 2224 * frames, or we have no pending frames, proceed to next queue. 2225 */ 2226 if (local->queue_stop_reasons[i] || 2227 skb_queue_empty(&local->pending[i])) 2228 continue; 2229 2230 while (!skb_queue_empty(&local->pending[i])) { 2231 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2232 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2233 2234 if (WARN_ON(!info->control.vif)) { 2235 ieee80211_free_txskb(&local->hw, skb); 2236 continue; 2237 } 2238 2239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2240 flags); 2241 2242 txok = ieee80211_tx_pending_skb(local, skb); 2243 spin_lock_irqsave(&local->queue_stop_reason_lock, 2244 flags); 2245 if (!txok) 2246 break; 2247 } 2248 2249 if (skb_queue_empty(&local->pending[i])) 2250 ieee80211_propagate_queue_wake(local, i); 2251 } 2252 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2253 2254 rcu_read_unlock(); 2255 } 2256 2257 /* functions for drivers to get certain frames */ 2258 2259 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2260 struct ps_data *ps, struct sk_buff *skb) 2261 { 2262 u8 *pos, *tim; 2263 int aid0 = 0; 2264 int i, have_bits = 0, n1, n2; 2265 2266 /* Generate bitmap for TIM only if there are any STAs in power save 2267 * mode. */ 2268 if (atomic_read(&ps->num_sta_ps) > 0) 2269 /* in the hope that this is faster than 2270 * checking byte-for-byte */ 2271 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2272 IEEE80211_MAX_AID+1); 2273 2274 if (ps->dtim_count == 0) 2275 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2276 else 2277 ps->dtim_count--; 2278 2279 tim = pos = (u8 *) skb_put(skb, 6); 2280 *pos++ = WLAN_EID_TIM; 2281 *pos++ = 4; 2282 *pos++ = ps->dtim_count; 2283 *pos++ = sdata->vif.bss_conf.dtim_period; 2284 2285 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2286 aid0 = 1; 2287 2288 ps->dtim_bc_mc = aid0 == 1; 2289 2290 if (have_bits) { 2291 /* Find largest even number N1 so that bits numbered 1 through 2292 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2293 * (N2 + 1) x 8 through 2007 are 0. */ 2294 n1 = 0; 2295 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2296 if (ps->tim[i]) { 2297 n1 = i & 0xfe; 2298 break; 2299 } 2300 } 2301 n2 = n1; 2302 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2303 if (ps->tim[i]) { 2304 n2 = i; 2305 break; 2306 } 2307 } 2308 2309 /* Bitmap control */ 2310 *pos++ = n1 | aid0; 2311 /* Part Virt Bitmap */ 2312 skb_put(skb, n2 - n1); 2313 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2314 2315 tim[1] = n2 - n1 + 4; 2316 } else { 2317 *pos++ = aid0; /* Bitmap control */ 2318 *pos++ = 0; /* Part Virt Bitmap */ 2319 } 2320 } 2321 2322 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2323 struct ps_data *ps, struct sk_buff *skb) 2324 { 2325 struct ieee80211_local *local = sdata->local; 2326 2327 /* 2328 * Not very nice, but we want to allow the driver to call 2329 * ieee80211_beacon_get() as a response to the set_tim() 2330 * callback. That, however, is already invoked under the 2331 * sta_lock to guarantee consistent and race-free update 2332 * of the tim bitmap in mac80211 and the driver. 2333 */ 2334 if (local->tim_in_locked_section) { 2335 __ieee80211_beacon_add_tim(sdata, ps, skb); 2336 } else { 2337 spin_lock_bh(&local->tim_lock); 2338 __ieee80211_beacon_add_tim(sdata, ps, skb); 2339 spin_unlock_bh(&local->tim_lock); 2340 } 2341 2342 return 0; 2343 } 2344 2345 void ieee80211_csa_finish(struct ieee80211_vif *vif) 2346 { 2347 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2348 2349 ieee80211_queue_work(&sdata->local->hw, 2350 &sdata->csa_finalize_work); 2351 } 2352 EXPORT_SYMBOL(ieee80211_csa_finish); 2353 2354 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata, 2355 struct beacon_data *beacon) 2356 { 2357 struct probe_resp *resp; 2358 int counter_offset_beacon = sdata->csa_counter_offset_beacon; 2359 int counter_offset_presp = sdata->csa_counter_offset_presp; 2360 2361 /* warn if the driver did not check for/react to csa completeness */ 2362 if (WARN_ON(((u8 *)beacon->tail)[counter_offset_beacon] == 0)) 2363 return; 2364 2365 ((u8 *)beacon->tail)[counter_offset_beacon]--; 2366 2367 if (sdata->vif.type == NL80211_IFTYPE_AP && 2368 counter_offset_presp) { 2369 rcu_read_lock(); 2370 resp = rcu_dereference(sdata->u.ap.probe_resp); 2371 2372 /* if nl80211 accepted the offset, this should not happen. */ 2373 if (WARN_ON(!resp)) { 2374 rcu_read_unlock(); 2375 return; 2376 } 2377 resp->data[counter_offset_presp]--; 2378 rcu_read_unlock(); 2379 } 2380 } 2381 2382 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 2383 { 2384 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2385 struct beacon_data *beacon = NULL; 2386 u8 *beacon_data; 2387 size_t beacon_data_len; 2388 int counter_beacon = sdata->csa_counter_offset_beacon; 2389 int ret = false; 2390 2391 if (!ieee80211_sdata_running(sdata)) 2392 return false; 2393 2394 rcu_read_lock(); 2395 if (vif->type == NL80211_IFTYPE_AP) { 2396 struct ieee80211_if_ap *ap = &sdata->u.ap; 2397 2398 beacon = rcu_dereference(ap->beacon); 2399 if (WARN_ON(!beacon || !beacon->tail)) 2400 goto out; 2401 beacon_data = beacon->tail; 2402 beacon_data_len = beacon->tail_len; 2403 } else { 2404 WARN_ON(1); 2405 goto out; 2406 } 2407 2408 if (WARN_ON(counter_beacon > beacon_data_len)) 2409 goto out; 2410 2411 if (beacon_data[counter_beacon] == 0) 2412 ret = true; 2413 out: 2414 rcu_read_unlock(); 2415 2416 return ret; 2417 } 2418 EXPORT_SYMBOL(ieee80211_csa_is_complete); 2419 2420 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2421 struct ieee80211_vif *vif, 2422 u16 *tim_offset, u16 *tim_length) 2423 { 2424 struct ieee80211_local *local = hw_to_local(hw); 2425 struct sk_buff *skb = NULL; 2426 struct ieee80211_tx_info *info; 2427 struct ieee80211_sub_if_data *sdata = NULL; 2428 enum ieee80211_band band; 2429 struct ieee80211_tx_rate_control txrc; 2430 struct ieee80211_chanctx_conf *chanctx_conf; 2431 2432 rcu_read_lock(); 2433 2434 sdata = vif_to_sdata(vif); 2435 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2436 2437 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2438 goto out; 2439 2440 if (tim_offset) 2441 *tim_offset = 0; 2442 if (tim_length) 2443 *tim_length = 0; 2444 2445 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2446 struct ieee80211_if_ap *ap = &sdata->u.ap; 2447 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2448 2449 if (beacon) { 2450 if (sdata->vif.csa_active) 2451 ieee80211_update_csa(sdata, beacon); 2452 2453 /* 2454 * headroom, head length, 2455 * tail length and maximum TIM length 2456 */ 2457 skb = dev_alloc_skb(local->tx_headroom + 2458 beacon->head_len + 2459 beacon->tail_len + 256); 2460 if (!skb) 2461 goto out; 2462 2463 skb_reserve(skb, local->tx_headroom); 2464 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2465 beacon->head_len); 2466 2467 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2468 2469 if (tim_offset) 2470 *tim_offset = beacon->head_len; 2471 if (tim_length) 2472 *tim_length = skb->len - beacon->head_len; 2473 2474 if (beacon->tail) 2475 memcpy(skb_put(skb, beacon->tail_len), 2476 beacon->tail, beacon->tail_len); 2477 } else 2478 goto out; 2479 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2480 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2481 struct ieee80211_hdr *hdr; 2482 struct beacon_data *presp = rcu_dereference(ifibss->presp); 2483 2484 if (!presp) 2485 goto out; 2486 2487 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 2488 if (!skb) 2489 goto out; 2490 skb_reserve(skb, local->tx_headroom); 2491 memcpy(skb_put(skb, presp->head_len), presp->head, 2492 presp->head_len); 2493 2494 hdr = (struct ieee80211_hdr *) skb->data; 2495 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2496 IEEE80211_STYPE_BEACON); 2497 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2498 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2499 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2500 2501 if (!bcn) 2502 goto out; 2503 2504 if (ifmsh->sync_ops) 2505 ifmsh->sync_ops->adjust_tbtt( 2506 sdata); 2507 2508 skb = dev_alloc_skb(local->tx_headroom + 2509 bcn->head_len + 2510 256 + /* TIM IE */ 2511 bcn->tail_len); 2512 if (!skb) 2513 goto out; 2514 skb_reserve(skb, local->tx_headroom); 2515 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2516 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2517 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2518 } else { 2519 WARN_ON(1); 2520 goto out; 2521 } 2522 2523 band = chanctx_conf->def.chan->band; 2524 2525 info = IEEE80211_SKB_CB(skb); 2526 2527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2528 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2529 info->band = band; 2530 2531 memset(&txrc, 0, sizeof(txrc)); 2532 txrc.hw = hw; 2533 txrc.sband = local->hw.wiphy->bands[band]; 2534 txrc.bss_conf = &sdata->vif.bss_conf; 2535 txrc.skb = skb; 2536 txrc.reported_rate.idx = -1; 2537 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2538 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2539 txrc.max_rate_idx = -1; 2540 else 2541 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2542 txrc.bss = true; 2543 rate_control_get_rate(sdata, NULL, &txrc); 2544 2545 info->control.vif = vif; 2546 2547 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2548 IEEE80211_TX_CTL_ASSIGN_SEQ | 2549 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2550 out: 2551 rcu_read_unlock(); 2552 return skb; 2553 } 2554 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2555 2556 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2557 struct ieee80211_vif *vif) 2558 { 2559 struct ieee80211_if_ap *ap = NULL; 2560 struct sk_buff *skb = NULL; 2561 struct probe_resp *presp = NULL; 2562 struct ieee80211_hdr *hdr; 2563 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2564 2565 if (sdata->vif.type != NL80211_IFTYPE_AP) 2566 return NULL; 2567 2568 rcu_read_lock(); 2569 2570 ap = &sdata->u.ap; 2571 presp = rcu_dereference(ap->probe_resp); 2572 if (!presp) 2573 goto out; 2574 2575 skb = dev_alloc_skb(presp->len); 2576 if (!skb) 2577 goto out; 2578 2579 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2580 2581 hdr = (struct ieee80211_hdr *) skb->data; 2582 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2583 2584 out: 2585 rcu_read_unlock(); 2586 return skb; 2587 } 2588 EXPORT_SYMBOL(ieee80211_proberesp_get); 2589 2590 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2591 struct ieee80211_vif *vif) 2592 { 2593 struct ieee80211_sub_if_data *sdata; 2594 struct ieee80211_if_managed *ifmgd; 2595 struct ieee80211_pspoll *pspoll; 2596 struct ieee80211_local *local; 2597 struct sk_buff *skb; 2598 2599 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2600 return NULL; 2601 2602 sdata = vif_to_sdata(vif); 2603 ifmgd = &sdata->u.mgd; 2604 local = sdata->local; 2605 2606 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2607 if (!skb) 2608 return NULL; 2609 2610 skb_reserve(skb, local->hw.extra_tx_headroom); 2611 2612 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2613 memset(pspoll, 0, sizeof(*pspoll)); 2614 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2615 IEEE80211_STYPE_PSPOLL); 2616 pspoll->aid = cpu_to_le16(ifmgd->aid); 2617 2618 /* aid in PS-Poll has its two MSBs each set to 1 */ 2619 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2620 2621 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2622 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2623 2624 return skb; 2625 } 2626 EXPORT_SYMBOL(ieee80211_pspoll_get); 2627 2628 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2629 struct ieee80211_vif *vif) 2630 { 2631 struct ieee80211_hdr_3addr *nullfunc; 2632 struct ieee80211_sub_if_data *sdata; 2633 struct ieee80211_if_managed *ifmgd; 2634 struct ieee80211_local *local; 2635 struct sk_buff *skb; 2636 2637 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2638 return NULL; 2639 2640 sdata = vif_to_sdata(vif); 2641 ifmgd = &sdata->u.mgd; 2642 local = sdata->local; 2643 2644 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2645 if (!skb) 2646 return NULL; 2647 2648 skb_reserve(skb, local->hw.extra_tx_headroom); 2649 2650 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2651 sizeof(*nullfunc)); 2652 memset(nullfunc, 0, sizeof(*nullfunc)); 2653 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2654 IEEE80211_STYPE_NULLFUNC | 2655 IEEE80211_FCTL_TODS); 2656 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2657 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2658 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2659 2660 return skb; 2661 } 2662 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2663 2664 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2665 struct ieee80211_vif *vif, 2666 const u8 *ssid, size_t ssid_len, 2667 size_t tailroom) 2668 { 2669 struct ieee80211_sub_if_data *sdata; 2670 struct ieee80211_local *local; 2671 struct ieee80211_hdr_3addr *hdr; 2672 struct sk_buff *skb; 2673 size_t ie_ssid_len; 2674 u8 *pos; 2675 2676 sdata = vif_to_sdata(vif); 2677 local = sdata->local; 2678 ie_ssid_len = 2 + ssid_len; 2679 2680 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2681 ie_ssid_len + tailroom); 2682 if (!skb) 2683 return NULL; 2684 2685 skb_reserve(skb, local->hw.extra_tx_headroom); 2686 2687 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2688 memset(hdr, 0, sizeof(*hdr)); 2689 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2690 IEEE80211_STYPE_PROBE_REQ); 2691 eth_broadcast_addr(hdr->addr1); 2692 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2693 eth_broadcast_addr(hdr->addr3); 2694 2695 pos = skb_put(skb, ie_ssid_len); 2696 *pos++ = WLAN_EID_SSID; 2697 *pos++ = ssid_len; 2698 if (ssid_len) 2699 memcpy(pos, ssid, ssid_len); 2700 pos += ssid_len; 2701 2702 return skb; 2703 } 2704 EXPORT_SYMBOL(ieee80211_probereq_get); 2705 2706 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2707 const void *frame, size_t frame_len, 2708 const struct ieee80211_tx_info *frame_txctl, 2709 struct ieee80211_rts *rts) 2710 { 2711 const struct ieee80211_hdr *hdr = frame; 2712 2713 rts->frame_control = 2714 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2715 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2716 frame_txctl); 2717 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2718 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2719 } 2720 EXPORT_SYMBOL(ieee80211_rts_get); 2721 2722 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2723 const void *frame, size_t frame_len, 2724 const struct ieee80211_tx_info *frame_txctl, 2725 struct ieee80211_cts *cts) 2726 { 2727 const struct ieee80211_hdr *hdr = frame; 2728 2729 cts->frame_control = 2730 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2731 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2732 frame_len, frame_txctl); 2733 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2734 } 2735 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2736 2737 struct sk_buff * 2738 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2739 struct ieee80211_vif *vif) 2740 { 2741 struct ieee80211_local *local = hw_to_local(hw); 2742 struct sk_buff *skb = NULL; 2743 struct ieee80211_tx_data tx; 2744 struct ieee80211_sub_if_data *sdata; 2745 struct ps_data *ps; 2746 struct ieee80211_tx_info *info; 2747 struct ieee80211_chanctx_conf *chanctx_conf; 2748 2749 sdata = vif_to_sdata(vif); 2750 2751 rcu_read_lock(); 2752 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2753 2754 if (!chanctx_conf) 2755 goto out; 2756 2757 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2758 struct beacon_data *beacon = 2759 rcu_dereference(sdata->u.ap.beacon); 2760 2761 if (!beacon || !beacon->head) 2762 goto out; 2763 2764 ps = &sdata->u.ap.ps; 2765 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2766 ps = &sdata->u.mesh.ps; 2767 } else { 2768 goto out; 2769 } 2770 2771 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2772 goto out; /* send buffered bc/mc only after DTIM beacon */ 2773 2774 while (1) { 2775 skb = skb_dequeue(&ps->bc_buf); 2776 if (!skb) 2777 goto out; 2778 local->total_ps_buffered--; 2779 2780 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2781 struct ieee80211_hdr *hdr = 2782 (struct ieee80211_hdr *) skb->data; 2783 /* more buffered multicast/broadcast frames ==> set 2784 * MoreData flag in IEEE 802.11 header to inform PS 2785 * STAs */ 2786 hdr->frame_control |= 2787 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2788 } 2789 2790 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2791 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2792 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2793 break; 2794 dev_kfree_skb_any(skb); 2795 } 2796 2797 info = IEEE80211_SKB_CB(skb); 2798 2799 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2800 info->band = chanctx_conf->def.chan->band; 2801 2802 if (invoke_tx_handlers(&tx)) 2803 skb = NULL; 2804 out: 2805 rcu_read_unlock(); 2806 2807 return skb; 2808 } 2809 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2810 2811 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2812 struct sk_buff *skb, int tid, 2813 enum ieee80211_band band) 2814 { 2815 int ac = ieee802_1d_to_ac[tid & 7]; 2816 2817 skb_set_mac_header(skb, 0); 2818 skb_set_network_header(skb, 0); 2819 skb_set_transport_header(skb, 0); 2820 2821 skb_set_queue_mapping(skb, ac); 2822 skb->priority = tid; 2823 2824 skb->dev = sdata->dev; 2825 2826 /* 2827 * The other path calling ieee80211_xmit is from the tasklet, 2828 * and while we can handle concurrent transmissions locking 2829 * requirements are that we do not come into tx with bhs on. 2830 */ 2831 local_bh_disable(); 2832 ieee80211_xmit(sdata, skb, band); 2833 local_bh_enable(); 2834 } 2835