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 IEEE80211_TX_INTFL_NL80211_FRAME_TX) || 1125 tx->sdata->control_port_protocol == tx->skb->protocol) { 1126 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1127 } 1128 if (!tx->sta) 1129 tx->sta = sta_info_get(sdata, hdr->addr1); 1130 1131 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1132 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1133 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1134 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1135 struct tid_ampdu_tx *tid_tx; 1136 1137 qc = ieee80211_get_qos_ctl(hdr); 1138 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1139 1140 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1141 if (tid_tx) { 1142 bool queued; 1143 1144 queued = ieee80211_tx_prep_agg(tx, skb, info, 1145 tid_tx, tid); 1146 1147 if (unlikely(queued)) 1148 return TX_QUEUED; 1149 } 1150 } 1151 1152 if (is_multicast_ether_addr(hdr->addr1)) { 1153 tx->flags &= ~IEEE80211_TX_UNICAST; 1154 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1155 } else 1156 tx->flags |= IEEE80211_TX_UNICAST; 1157 1158 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1159 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1160 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1161 info->flags & IEEE80211_TX_CTL_AMPDU) 1162 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1163 } 1164 1165 if (!tx->sta) 1166 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1167 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1168 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1169 1170 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1171 1172 return TX_CONTINUE; 1173 } 1174 1175 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1176 struct ieee80211_vif *vif, 1177 struct ieee80211_sta *sta, 1178 struct sk_buff_head *skbs, 1179 bool txpending) 1180 { 1181 struct ieee80211_tx_control control; 1182 struct sk_buff *skb, *tmp; 1183 unsigned long flags; 1184 1185 skb_queue_walk_safe(skbs, skb, tmp) { 1186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1187 int q = info->hw_queue; 1188 1189 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1190 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1191 __skb_unlink(skb, skbs); 1192 ieee80211_free_txskb(&local->hw, skb); 1193 continue; 1194 } 1195 #endif 1196 1197 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1198 if (local->queue_stop_reasons[q] || 1199 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1200 if (unlikely(info->flags & 1201 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1202 if (local->queue_stop_reasons[q] & 1203 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1204 /* 1205 * Drop off-channel frames if queues 1206 * are stopped for any reason other 1207 * than off-channel operation. Never 1208 * queue them. 1209 */ 1210 spin_unlock_irqrestore( 1211 &local->queue_stop_reason_lock, 1212 flags); 1213 ieee80211_purge_tx_queue(&local->hw, 1214 skbs); 1215 return true; 1216 } 1217 } else { 1218 1219 /* 1220 * Since queue is stopped, queue up frames for 1221 * later transmission from the tx-pending 1222 * tasklet when the queue is woken again. 1223 */ 1224 if (txpending) 1225 skb_queue_splice_init(skbs, 1226 &local->pending[q]); 1227 else 1228 skb_queue_splice_tail_init(skbs, 1229 &local->pending[q]); 1230 1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1232 flags); 1233 return false; 1234 } 1235 } 1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1237 1238 info->control.vif = vif; 1239 control.sta = sta; 1240 1241 __skb_unlink(skb, skbs); 1242 drv_tx(local, &control, skb); 1243 } 1244 1245 return true; 1246 } 1247 1248 /* 1249 * Returns false if the frame couldn't be transmitted but was queued instead. 1250 */ 1251 static bool __ieee80211_tx(struct ieee80211_local *local, 1252 struct sk_buff_head *skbs, int led_len, 1253 struct sta_info *sta, bool txpending) 1254 { 1255 struct ieee80211_tx_info *info; 1256 struct ieee80211_sub_if_data *sdata; 1257 struct ieee80211_vif *vif; 1258 struct ieee80211_sta *pubsta; 1259 struct sk_buff *skb; 1260 bool result = true; 1261 __le16 fc; 1262 1263 if (WARN_ON(skb_queue_empty(skbs))) 1264 return true; 1265 1266 skb = skb_peek(skbs); 1267 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1268 info = IEEE80211_SKB_CB(skb); 1269 sdata = vif_to_sdata(info->control.vif); 1270 if (sta && !sta->uploaded) 1271 sta = NULL; 1272 1273 if (sta) 1274 pubsta = &sta->sta; 1275 else 1276 pubsta = NULL; 1277 1278 switch (sdata->vif.type) { 1279 case NL80211_IFTYPE_MONITOR: 1280 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1281 vif = &sdata->vif; 1282 break; 1283 } 1284 sdata = rcu_dereference(local->monitor_sdata); 1285 if (sdata) { 1286 vif = &sdata->vif; 1287 info->hw_queue = 1288 vif->hw_queue[skb_get_queue_mapping(skb)]; 1289 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1290 dev_kfree_skb(skb); 1291 return true; 1292 } else 1293 vif = NULL; 1294 break; 1295 case NL80211_IFTYPE_AP_VLAN: 1296 sdata = container_of(sdata->bss, 1297 struct ieee80211_sub_if_data, u.ap); 1298 /* fall through */ 1299 default: 1300 vif = &sdata->vif; 1301 break; 1302 } 1303 1304 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1305 txpending); 1306 1307 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1308 1309 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1310 1311 return result; 1312 } 1313 1314 /* 1315 * Invoke TX handlers, return 0 on success and non-zero if the 1316 * frame was dropped or queued. 1317 */ 1318 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1319 { 1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1321 ieee80211_tx_result res = TX_DROP; 1322 1323 #define CALL_TXH(txh) \ 1324 do { \ 1325 res = txh(tx); \ 1326 if (res != TX_CONTINUE) \ 1327 goto txh_done; \ 1328 } while (0) 1329 1330 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1331 CALL_TXH(ieee80211_tx_h_check_assoc); 1332 CALL_TXH(ieee80211_tx_h_ps_buf); 1333 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1334 CALL_TXH(ieee80211_tx_h_select_key); 1335 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1336 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1337 1338 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1339 __skb_queue_tail(&tx->skbs, tx->skb); 1340 tx->skb = NULL; 1341 goto txh_done; 1342 } 1343 1344 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1345 CALL_TXH(ieee80211_tx_h_sequence); 1346 CALL_TXH(ieee80211_tx_h_fragment); 1347 /* handlers after fragment must be aware of tx info fragmentation! */ 1348 CALL_TXH(ieee80211_tx_h_stats); 1349 CALL_TXH(ieee80211_tx_h_encrypt); 1350 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1351 CALL_TXH(ieee80211_tx_h_calculate_duration); 1352 #undef CALL_TXH 1353 1354 txh_done: 1355 if (unlikely(res == TX_DROP)) { 1356 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1357 if (tx->skb) 1358 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1359 else 1360 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1361 return -1; 1362 } else if (unlikely(res == TX_QUEUED)) { 1363 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1364 return -1; 1365 } 1366 1367 return 0; 1368 } 1369 1370 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1371 struct ieee80211_vif *vif, struct sk_buff *skb, 1372 int band, struct ieee80211_sta **sta) 1373 { 1374 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1375 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1376 struct ieee80211_tx_data tx; 1377 1378 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) 1379 return false; 1380 1381 info->band = band; 1382 info->control.vif = vif; 1383 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1384 1385 if (invoke_tx_handlers(&tx)) 1386 return false; 1387 1388 if (sta) { 1389 if (tx.sta) 1390 *sta = &tx.sta->sta; 1391 else 1392 *sta = NULL; 1393 } 1394 1395 return true; 1396 } 1397 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1398 1399 /* 1400 * Returns false if the frame couldn't be transmitted but was queued instead. 1401 */ 1402 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1403 struct sk_buff *skb, bool txpending, 1404 enum ieee80211_band band) 1405 { 1406 struct ieee80211_local *local = sdata->local; 1407 struct ieee80211_tx_data tx; 1408 ieee80211_tx_result res_prepare; 1409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1410 bool result = true; 1411 int led_len; 1412 1413 if (unlikely(skb->len < 10)) { 1414 dev_kfree_skb(skb); 1415 return true; 1416 } 1417 1418 /* initialises tx */ 1419 led_len = skb->len; 1420 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1421 1422 if (unlikely(res_prepare == TX_DROP)) { 1423 ieee80211_free_txskb(&local->hw, skb); 1424 return true; 1425 } else if (unlikely(res_prepare == TX_QUEUED)) { 1426 return true; 1427 } 1428 1429 info->band = band; 1430 1431 /* set up hw_queue value early */ 1432 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1433 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1434 info->hw_queue = 1435 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1436 1437 if (!invoke_tx_handlers(&tx)) 1438 result = __ieee80211_tx(local, &tx.skbs, led_len, 1439 tx.sta, txpending); 1440 1441 return result; 1442 } 1443 1444 /* device xmit handlers */ 1445 1446 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1447 struct sk_buff *skb, 1448 int head_need, bool may_encrypt) 1449 { 1450 struct ieee80211_local *local = sdata->local; 1451 int tail_need = 0; 1452 1453 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1454 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1455 tail_need -= skb_tailroom(skb); 1456 tail_need = max_t(int, tail_need, 0); 1457 } 1458 1459 if (skb_cloned(skb)) 1460 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1461 else if (head_need || tail_need) 1462 I802_DEBUG_INC(local->tx_expand_skb_head); 1463 else 1464 return 0; 1465 1466 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1467 wiphy_debug(local->hw.wiphy, 1468 "failed to reallocate TX buffer\n"); 1469 return -ENOMEM; 1470 } 1471 1472 return 0; 1473 } 1474 1475 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1476 enum ieee80211_band band) 1477 { 1478 struct ieee80211_local *local = sdata->local; 1479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1481 int headroom; 1482 bool may_encrypt; 1483 1484 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1485 1486 headroom = local->tx_headroom; 1487 if (may_encrypt) 1488 headroom += IEEE80211_ENCRYPT_HEADROOM; 1489 headroom -= skb_headroom(skb); 1490 headroom = max_t(int, 0, headroom); 1491 1492 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1493 ieee80211_free_txskb(&local->hw, skb); 1494 return; 1495 } 1496 1497 hdr = (struct ieee80211_hdr *) skb->data; 1498 info->control.vif = &sdata->vif; 1499 1500 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1501 if (ieee80211_is_data(hdr->frame_control) && 1502 is_unicast_ether_addr(hdr->addr1)) { 1503 if (mesh_nexthop_resolve(sdata, skb)) 1504 return; /* skb queued: don't free */ 1505 } else { 1506 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1507 } 1508 } 1509 1510 ieee80211_set_qos_hdr(sdata, skb); 1511 ieee80211_tx(sdata, skb, false, band); 1512 } 1513 1514 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1515 { 1516 struct ieee80211_radiotap_iterator iterator; 1517 struct ieee80211_radiotap_header *rthdr = 1518 (struct ieee80211_radiotap_header *) skb->data; 1519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1520 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1521 NULL); 1522 u16 txflags; 1523 1524 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1525 IEEE80211_TX_CTL_DONTFRAG; 1526 1527 /* 1528 * for every radiotap entry that is present 1529 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1530 * entries present, or -EINVAL on error) 1531 */ 1532 1533 while (!ret) { 1534 ret = ieee80211_radiotap_iterator_next(&iterator); 1535 1536 if (ret) 1537 continue; 1538 1539 /* see if this argument is something we can use */ 1540 switch (iterator.this_arg_index) { 1541 /* 1542 * You must take care when dereferencing iterator.this_arg 1543 * for multibyte types... the pointer is not aligned. Use 1544 * get_unaligned((type *)iterator.this_arg) to dereference 1545 * iterator.this_arg for type "type" safely on all arches. 1546 */ 1547 case IEEE80211_RADIOTAP_FLAGS: 1548 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1549 /* 1550 * this indicates that the skb we have been 1551 * handed has the 32-bit FCS CRC at the end... 1552 * we should react to that by snipping it off 1553 * because it will be recomputed and added 1554 * on transmission 1555 */ 1556 if (skb->len < (iterator._max_length + FCS_LEN)) 1557 return false; 1558 1559 skb_trim(skb, skb->len - FCS_LEN); 1560 } 1561 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1562 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1563 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1564 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1565 break; 1566 1567 case IEEE80211_RADIOTAP_TX_FLAGS: 1568 txflags = get_unaligned_le16(iterator.this_arg); 1569 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1570 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1571 break; 1572 1573 /* 1574 * Please update the file 1575 * Documentation/networking/mac80211-injection.txt 1576 * when parsing new fields here. 1577 */ 1578 1579 default: 1580 break; 1581 } 1582 } 1583 1584 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1585 return false; 1586 1587 /* 1588 * remove the radiotap header 1589 * iterator->_max_length was sanity-checked against 1590 * skb->len by iterator init 1591 */ 1592 skb_pull(skb, iterator._max_length); 1593 1594 return true; 1595 } 1596 1597 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1598 struct net_device *dev) 1599 { 1600 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1601 struct ieee80211_chanctx_conf *chanctx_conf; 1602 struct ieee80211_channel *chan; 1603 struct ieee80211_radiotap_header *prthdr = 1604 (struct ieee80211_radiotap_header *)skb->data; 1605 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1606 struct ieee80211_hdr *hdr; 1607 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1608 u16 len_rthdr; 1609 int hdrlen; 1610 1611 /* check for not even having the fixed radiotap header part */ 1612 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1613 goto fail; /* too short to be possibly valid */ 1614 1615 /* is it a header version we can trust to find length from? */ 1616 if (unlikely(prthdr->it_version)) 1617 goto fail; /* only version 0 is supported */ 1618 1619 /* then there must be a radiotap header with a length we can use */ 1620 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1621 1622 /* does the skb contain enough to deliver on the alleged length? */ 1623 if (unlikely(skb->len < len_rthdr)) 1624 goto fail; /* skb too short for claimed rt header extent */ 1625 1626 /* 1627 * fix up the pointers accounting for the radiotap 1628 * header still being in there. We are being given 1629 * a precooked IEEE80211 header so no need for 1630 * normal processing 1631 */ 1632 skb_set_mac_header(skb, len_rthdr); 1633 /* 1634 * these are just fixed to the end of the rt area since we 1635 * don't have any better information and at this point, nobody cares 1636 */ 1637 skb_set_network_header(skb, len_rthdr); 1638 skb_set_transport_header(skb, len_rthdr); 1639 1640 if (skb->len < len_rthdr + 2) 1641 goto fail; 1642 1643 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1644 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1645 1646 if (skb->len < len_rthdr + hdrlen) 1647 goto fail; 1648 1649 /* 1650 * Initialize skb->protocol if the injected frame is a data frame 1651 * carrying a rfc1042 header 1652 */ 1653 if (ieee80211_is_data(hdr->frame_control) && 1654 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1655 u8 *payload = (u8 *)hdr + hdrlen; 1656 1657 if (ether_addr_equal(payload, rfc1042_header)) 1658 skb->protocol = cpu_to_be16((payload[6] << 8) | 1659 payload[7]); 1660 } 1661 1662 memset(info, 0, sizeof(*info)); 1663 1664 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1665 IEEE80211_TX_CTL_INJECTED; 1666 1667 /* process and remove the injection radiotap header */ 1668 if (!ieee80211_parse_tx_radiotap(skb)) 1669 goto fail; 1670 1671 rcu_read_lock(); 1672 1673 /* 1674 * We process outgoing injected frames that have a local address 1675 * we handle as though they are non-injected frames. 1676 * This code here isn't entirely correct, the local MAC address 1677 * isn't always enough to find the interface to use; for proper 1678 * VLAN/WDS support we will need a different mechanism (which 1679 * likely isn't going to be monitor interfaces). 1680 */ 1681 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1682 1683 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1684 if (!ieee80211_sdata_running(tmp_sdata)) 1685 continue; 1686 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1687 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1688 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1689 continue; 1690 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1691 sdata = tmp_sdata; 1692 break; 1693 } 1694 } 1695 1696 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1697 if (!chanctx_conf) { 1698 tmp_sdata = rcu_dereference(local->monitor_sdata); 1699 if (tmp_sdata) 1700 chanctx_conf = 1701 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1702 } 1703 1704 if (chanctx_conf) 1705 chan = chanctx_conf->def.chan; 1706 else if (!local->use_chanctx) 1707 chan = local->_oper_chandef.chan; 1708 else 1709 goto fail_rcu; 1710 1711 /* 1712 * Frame injection is not allowed if beaconing is not allowed 1713 * or if we need radar detection. Beaconing is usually not allowed when 1714 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1715 * Passive scan is also used in world regulatory domains where 1716 * your country is not known and as such it should be treated as 1717 * NO TX unless the channel is explicitly allowed in which case 1718 * your current regulatory domain would not have the passive scan 1719 * flag. 1720 * 1721 * Since AP mode uses monitor interfaces to inject/TX management 1722 * frames we can make AP mode the exception to this rule once it 1723 * supports radar detection as its implementation can deal with 1724 * radar detection by itself. We can do that later by adding a 1725 * monitor flag interfaces used for AP support. 1726 */ 1727 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1728 IEEE80211_CHAN_PASSIVE_SCAN))) 1729 goto fail_rcu; 1730 1731 ieee80211_xmit(sdata, skb, chan->band); 1732 rcu_read_unlock(); 1733 1734 return NETDEV_TX_OK; 1735 1736 fail_rcu: 1737 rcu_read_unlock(); 1738 fail: 1739 dev_kfree_skb(skb); 1740 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1741 } 1742 1743 /** 1744 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1745 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1746 * @skb: packet to be sent 1747 * @dev: incoming interface 1748 * 1749 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1750 * not be freed, and caller is responsible for either retrying later or freeing 1751 * skb). 1752 * 1753 * This function takes in an Ethernet header and encapsulates it with suitable 1754 * IEEE 802.11 header based on which interface the packet is coming in. The 1755 * encapsulated packet will then be passed to master interface, wlan#.11, for 1756 * transmission (through low-level driver). 1757 */ 1758 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1759 struct net_device *dev) 1760 { 1761 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1762 struct ieee80211_local *local = sdata->local; 1763 struct ieee80211_tx_info *info; 1764 int head_need; 1765 u16 ethertype, hdrlen, meshhdrlen = 0; 1766 __le16 fc; 1767 struct ieee80211_hdr hdr; 1768 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1769 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1770 const u8 *encaps_data; 1771 int encaps_len, skip_header_bytes; 1772 int nh_pos, h_pos; 1773 struct sta_info *sta = NULL; 1774 bool wme_sta = false, authorized = false, tdls_auth = false; 1775 bool tdls_direct = false; 1776 bool multicast; 1777 u32 info_flags = 0; 1778 u16 info_id = 0; 1779 struct ieee80211_chanctx_conf *chanctx_conf; 1780 struct ieee80211_sub_if_data *ap_sdata; 1781 enum ieee80211_band band; 1782 1783 if (unlikely(skb->len < ETH_HLEN)) 1784 goto fail; 1785 1786 /* convert Ethernet header to proper 802.11 header (based on 1787 * operation mode) */ 1788 ethertype = (skb->data[12] << 8) | skb->data[13]; 1789 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1790 1791 rcu_read_lock(); 1792 1793 switch (sdata->vif.type) { 1794 case NL80211_IFTYPE_AP_VLAN: 1795 sta = rcu_dereference(sdata->u.vlan.sta); 1796 if (sta) { 1797 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1798 /* RA TA DA SA */ 1799 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1800 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1801 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1802 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1803 hdrlen = 30; 1804 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1805 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1806 } 1807 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1808 u.ap); 1809 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1810 if (!chanctx_conf) 1811 goto fail_rcu; 1812 band = chanctx_conf->def.chan->band; 1813 if (sta) 1814 break; 1815 /* fall through */ 1816 case NL80211_IFTYPE_AP: 1817 if (sdata->vif.type == NL80211_IFTYPE_AP) 1818 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1819 if (!chanctx_conf) 1820 goto fail_rcu; 1821 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1822 /* DA BSSID SA */ 1823 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1824 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1825 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1826 hdrlen = 24; 1827 band = chanctx_conf->def.chan->band; 1828 break; 1829 case NL80211_IFTYPE_WDS: 1830 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1831 /* RA TA DA SA */ 1832 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1833 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1834 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1835 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1836 hdrlen = 30; 1837 /* 1838 * This is the exception! WDS style interfaces are prohibited 1839 * when channel contexts are in used so this must be valid 1840 */ 1841 band = local->hw.conf.chandef.chan->band; 1842 break; 1843 #ifdef CONFIG_MAC80211_MESH 1844 case NL80211_IFTYPE_MESH_POINT: 1845 if (!is_multicast_ether_addr(skb->data)) { 1846 struct sta_info *next_hop; 1847 bool mpp_lookup = true; 1848 1849 mpath = mesh_path_lookup(sdata, skb->data); 1850 if (mpath) { 1851 mpp_lookup = false; 1852 next_hop = rcu_dereference(mpath->next_hop); 1853 if (!next_hop || 1854 !(mpath->flags & (MESH_PATH_ACTIVE | 1855 MESH_PATH_RESOLVING))) 1856 mpp_lookup = true; 1857 } 1858 1859 if (mpp_lookup) 1860 mppath = mpp_path_lookup(sdata, skb->data); 1861 1862 if (mppath && mpath) 1863 mesh_path_del(mpath->sdata, mpath->dst); 1864 } 1865 1866 /* 1867 * Use address extension if it is a packet from 1868 * another interface or if we know the destination 1869 * is being proxied by a portal (i.e. portal address 1870 * differs from proxied address) 1871 */ 1872 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1873 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1874 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1875 skb->data, skb->data + ETH_ALEN); 1876 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1877 NULL, NULL); 1878 } else { 1879 /* DS -> MBSS (802.11-2012 13.11.3.3). 1880 * For unicast with unknown forwarding information, 1881 * destination might be in the MBSS or if that fails 1882 * forwarded to another mesh gate. In either case 1883 * resolution will be handled in ieee80211_xmit(), so 1884 * leave the original DA. This also works for mcast */ 1885 const u8 *mesh_da = skb->data; 1886 1887 if (mppath) 1888 mesh_da = mppath->mpp; 1889 else if (mpath) 1890 mesh_da = mpath->dst; 1891 1892 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1893 mesh_da, sdata->vif.addr); 1894 if (is_multicast_ether_addr(mesh_da)) 1895 /* DA TA mSA AE:SA */ 1896 meshhdrlen = ieee80211_new_mesh_header( 1897 sdata, &mesh_hdr, 1898 skb->data + ETH_ALEN, NULL); 1899 else 1900 /* RA TA mDA mSA AE:DA SA */ 1901 meshhdrlen = ieee80211_new_mesh_header( 1902 sdata, &mesh_hdr, skb->data, 1903 skb->data + ETH_ALEN); 1904 1905 } 1906 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1907 if (!chanctx_conf) 1908 goto fail_rcu; 1909 band = chanctx_conf->def.chan->band; 1910 break; 1911 #endif 1912 case NL80211_IFTYPE_STATION: 1913 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1914 bool tdls_peer = false; 1915 1916 sta = sta_info_get(sdata, skb->data); 1917 if (sta) { 1918 authorized = test_sta_flag(sta, 1919 WLAN_STA_AUTHORIZED); 1920 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1921 tdls_peer = test_sta_flag(sta, 1922 WLAN_STA_TDLS_PEER); 1923 tdls_auth = test_sta_flag(sta, 1924 WLAN_STA_TDLS_PEER_AUTH); 1925 } 1926 1927 /* 1928 * If the TDLS link is enabled, send everything 1929 * directly. Otherwise, allow TDLS setup frames 1930 * to be transmitted indirectly. 1931 */ 1932 tdls_direct = tdls_peer && (tdls_auth || 1933 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1934 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1935 } 1936 1937 if (tdls_direct) { 1938 /* link during setup - throw out frames to peer */ 1939 if (!tdls_auth) 1940 goto fail_rcu; 1941 1942 /* DA SA BSSID */ 1943 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1944 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1945 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1946 hdrlen = 24; 1947 } else if (sdata->u.mgd.use_4addr && 1948 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1949 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1950 IEEE80211_FCTL_TODS); 1951 /* RA TA DA SA */ 1952 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1953 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1954 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1955 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1956 hdrlen = 30; 1957 } else { 1958 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1959 /* BSSID SA DA */ 1960 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1961 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1962 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1963 hdrlen = 24; 1964 } 1965 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1966 if (!chanctx_conf) 1967 goto fail_rcu; 1968 band = chanctx_conf->def.chan->band; 1969 break; 1970 case NL80211_IFTYPE_ADHOC: 1971 /* DA SA BSSID */ 1972 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1973 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1974 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1975 hdrlen = 24; 1976 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1977 if (!chanctx_conf) 1978 goto fail_rcu; 1979 band = chanctx_conf->def.chan->band; 1980 break; 1981 default: 1982 goto fail_rcu; 1983 } 1984 1985 /* 1986 * There's no need to try to look up the destination 1987 * if it is a multicast address (which can only happen 1988 * in AP mode) 1989 */ 1990 multicast = is_multicast_ether_addr(hdr.addr1); 1991 if (!multicast) { 1992 sta = sta_info_get(sdata, hdr.addr1); 1993 if (sta) { 1994 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1995 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1996 } 1997 } 1998 1999 /* For mesh, the use of the QoS header is mandatory */ 2000 if (ieee80211_vif_is_mesh(&sdata->vif)) 2001 wme_sta = true; 2002 2003 /* receiver and we are QoS enabled, use a QoS type frame */ 2004 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 2005 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2006 hdrlen += 2; 2007 } 2008 2009 /* 2010 * Drop unicast frames to unauthorised stations unless they are 2011 * EAPOL frames from the local station. 2012 */ 2013 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2014 !multicast && !authorized && 2015 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2016 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2017 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2018 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2019 dev->name, hdr.addr1); 2020 #endif 2021 2022 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2023 2024 goto fail_rcu; 2025 } 2026 2027 if (unlikely(!multicast && skb->sk && 2028 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2029 struct sk_buff *orig_skb = skb; 2030 2031 skb = skb_clone(skb, GFP_ATOMIC); 2032 if (skb) { 2033 unsigned long flags; 2034 int id; 2035 2036 spin_lock_irqsave(&local->ack_status_lock, flags); 2037 id = idr_alloc(&local->ack_status_frames, orig_skb, 2038 1, 0x10000, GFP_ATOMIC); 2039 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2040 2041 if (id >= 0) { 2042 info_id = id; 2043 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2044 } else if (skb_shared(skb)) { 2045 kfree_skb(orig_skb); 2046 } else { 2047 kfree_skb(skb); 2048 skb = orig_skb; 2049 } 2050 } else { 2051 /* couldn't clone -- lose tx status ... */ 2052 skb = orig_skb; 2053 } 2054 } 2055 2056 /* 2057 * If the skb is shared we need to obtain our own copy. 2058 */ 2059 if (skb_shared(skb)) { 2060 struct sk_buff *tmp_skb = skb; 2061 2062 /* can't happen -- skb is a clone if info_id != 0 */ 2063 WARN_ON(info_id); 2064 2065 skb = skb_clone(skb, GFP_ATOMIC); 2066 kfree_skb(tmp_skb); 2067 2068 if (!skb) 2069 goto fail_rcu; 2070 } 2071 2072 hdr.frame_control = fc; 2073 hdr.duration_id = 0; 2074 hdr.seq_ctrl = 0; 2075 2076 skip_header_bytes = ETH_HLEN; 2077 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2078 encaps_data = bridge_tunnel_header; 2079 encaps_len = sizeof(bridge_tunnel_header); 2080 skip_header_bytes -= 2; 2081 } else if (ethertype >= ETH_P_802_3_MIN) { 2082 encaps_data = rfc1042_header; 2083 encaps_len = sizeof(rfc1042_header); 2084 skip_header_bytes -= 2; 2085 } else { 2086 encaps_data = NULL; 2087 encaps_len = 0; 2088 } 2089 2090 nh_pos = skb_network_header(skb) - skb->data; 2091 h_pos = skb_transport_header(skb) - skb->data; 2092 2093 skb_pull(skb, skip_header_bytes); 2094 nh_pos -= skip_header_bytes; 2095 h_pos -= skip_header_bytes; 2096 2097 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2098 2099 /* 2100 * So we need to modify the skb header and hence need a copy of 2101 * that. The head_need variable above doesn't, so far, include 2102 * the needed header space that we don't need right away. If we 2103 * can, then we don't reallocate right now but only after the 2104 * frame arrives at the master device (if it does...) 2105 * 2106 * If we cannot, however, then we will reallocate to include all 2107 * the ever needed space. Also, if we need to reallocate it anyway, 2108 * make it big enough for everything we may ever need. 2109 */ 2110 2111 if (head_need > 0 || skb_cloned(skb)) { 2112 head_need += IEEE80211_ENCRYPT_HEADROOM; 2113 head_need += local->tx_headroom; 2114 head_need = max_t(int, 0, head_need); 2115 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2116 ieee80211_free_txskb(&local->hw, skb); 2117 skb = NULL; 2118 goto fail_rcu; 2119 } 2120 } 2121 2122 if (encaps_data) { 2123 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2124 nh_pos += encaps_len; 2125 h_pos += encaps_len; 2126 } 2127 2128 #ifdef CONFIG_MAC80211_MESH 2129 if (meshhdrlen > 0) { 2130 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2131 nh_pos += meshhdrlen; 2132 h_pos += meshhdrlen; 2133 } 2134 #endif 2135 2136 if (ieee80211_is_data_qos(fc)) { 2137 __le16 *qos_control; 2138 2139 qos_control = (__le16*) skb_push(skb, 2); 2140 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2141 /* 2142 * Maybe we could actually set some fields here, for now just 2143 * initialise to zero to indicate no special operation. 2144 */ 2145 *qos_control = 0; 2146 } else 2147 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2148 2149 nh_pos += hdrlen; 2150 h_pos += hdrlen; 2151 2152 dev->stats.tx_packets++; 2153 dev->stats.tx_bytes += skb->len; 2154 2155 /* Update skb pointers to various headers since this modified frame 2156 * is going to go through Linux networking code that may potentially 2157 * need things like pointer to IP header. */ 2158 skb_set_mac_header(skb, 0); 2159 skb_set_network_header(skb, nh_pos); 2160 skb_set_transport_header(skb, h_pos); 2161 2162 info = IEEE80211_SKB_CB(skb); 2163 memset(info, 0, sizeof(*info)); 2164 2165 dev->trans_start = jiffies; 2166 2167 info->flags = info_flags; 2168 info->ack_frame_id = info_id; 2169 2170 ieee80211_xmit(sdata, skb, band); 2171 rcu_read_unlock(); 2172 2173 return NETDEV_TX_OK; 2174 2175 fail_rcu: 2176 rcu_read_unlock(); 2177 fail: 2178 dev_kfree_skb(skb); 2179 return NETDEV_TX_OK; 2180 } 2181 2182 2183 /* 2184 * ieee80211_clear_tx_pending may not be called in a context where 2185 * it is possible that it packets could come in again. 2186 */ 2187 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2188 { 2189 struct sk_buff *skb; 2190 int i; 2191 2192 for (i = 0; i < local->hw.queues; i++) { 2193 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2194 ieee80211_free_txskb(&local->hw, skb); 2195 } 2196 } 2197 2198 /* 2199 * Returns false if the frame couldn't be transmitted but was queued instead, 2200 * which in this case means re-queued -- take as an indication to stop sending 2201 * more pending frames. 2202 */ 2203 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2204 struct sk_buff *skb) 2205 { 2206 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2207 struct ieee80211_sub_if_data *sdata; 2208 struct sta_info *sta; 2209 struct ieee80211_hdr *hdr; 2210 bool result; 2211 struct ieee80211_chanctx_conf *chanctx_conf; 2212 2213 sdata = vif_to_sdata(info->control.vif); 2214 2215 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2216 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2217 if (unlikely(!chanctx_conf)) { 2218 dev_kfree_skb(skb); 2219 return true; 2220 } 2221 result = ieee80211_tx(sdata, skb, true, 2222 chanctx_conf->def.chan->band); 2223 } else { 2224 struct sk_buff_head skbs; 2225 2226 __skb_queue_head_init(&skbs); 2227 __skb_queue_tail(&skbs, skb); 2228 2229 hdr = (struct ieee80211_hdr *)skb->data; 2230 sta = sta_info_get(sdata, hdr->addr1); 2231 2232 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2233 } 2234 2235 return result; 2236 } 2237 2238 /* 2239 * Transmit all pending packets. Called from tasklet. 2240 */ 2241 void ieee80211_tx_pending(unsigned long data) 2242 { 2243 struct ieee80211_local *local = (struct ieee80211_local *)data; 2244 unsigned long flags; 2245 int i; 2246 bool txok; 2247 2248 rcu_read_lock(); 2249 2250 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2251 for (i = 0; i < local->hw.queues; i++) { 2252 /* 2253 * If queue is stopped by something other than due to pending 2254 * frames, or we have no pending frames, proceed to next queue. 2255 */ 2256 if (local->queue_stop_reasons[i] || 2257 skb_queue_empty(&local->pending[i])) 2258 continue; 2259 2260 while (!skb_queue_empty(&local->pending[i])) { 2261 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2263 2264 if (WARN_ON(!info->control.vif)) { 2265 ieee80211_free_txskb(&local->hw, skb); 2266 continue; 2267 } 2268 2269 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2270 flags); 2271 2272 txok = ieee80211_tx_pending_skb(local, skb); 2273 spin_lock_irqsave(&local->queue_stop_reason_lock, 2274 flags); 2275 if (!txok) 2276 break; 2277 } 2278 2279 if (skb_queue_empty(&local->pending[i])) 2280 ieee80211_propagate_queue_wake(local, i); 2281 } 2282 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2283 2284 rcu_read_unlock(); 2285 } 2286 2287 /* functions for drivers to get certain frames */ 2288 2289 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2290 struct ps_data *ps, struct sk_buff *skb) 2291 { 2292 u8 *pos, *tim; 2293 int aid0 = 0; 2294 int i, have_bits = 0, n1, n2; 2295 2296 /* Generate bitmap for TIM only if there are any STAs in power save 2297 * mode. */ 2298 if (atomic_read(&ps->num_sta_ps) > 0) 2299 /* in the hope that this is faster than 2300 * checking byte-for-byte */ 2301 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2302 IEEE80211_MAX_AID+1); 2303 2304 if (ps->dtim_count == 0) 2305 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2306 else 2307 ps->dtim_count--; 2308 2309 tim = pos = (u8 *) skb_put(skb, 6); 2310 *pos++ = WLAN_EID_TIM; 2311 *pos++ = 4; 2312 *pos++ = ps->dtim_count; 2313 *pos++ = sdata->vif.bss_conf.dtim_period; 2314 2315 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2316 aid0 = 1; 2317 2318 ps->dtim_bc_mc = aid0 == 1; 2319 2320 if (have_bits) { 2321 /* Find largest even number N1 so that bits numbered 1 through 2322 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2323 * (N2 + 1) x 8 through 2007 are 0. */ 2324 n1 = 0; 2325 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2326 if (ps->tim[i]) { 2327 n1 = i & 0xfe; 2328 break; 2329 } 2330 } 2331 n2 = n1; 2332 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2333 if (ps->tim[i]) { 2334 n2 = i; 2335 break; 2336 } 2337 } 2338 2339 /* Bitmap control */ 2340 *pos++ = n1 | aid0; 2341 /* Part Virt Bitmap */ 2342 skb_put(skb, n2 - n1); 2343 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2344 2345 tim[1] = n2 - n1 + 4; 2346 } else { 2347 *pos++ = aid0; /* Bitmap control */ 2348 *pos++ = 0; /* Part Virt Bitmap */ 2349 } 2350 } 2351 2352 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2353 struct ps_data *ps, struct sk_buff *skb) 2354 { 2355 struct ieee80211_local *local = sdata->local; 2356 2357 /* 2358 * Not very nice, but we want to allow the driver to call 2359 * ieee80211_beacon_get() as a response to the set_tim() 2360 * callback. That, however, is already invoked under the 2361 * sta_lock to guarantee consistent and race-free update 2362 * of the tim bitmap in mac80211 and the driver. 2363 */ 2364 if (local->tim_in_locked_section) { 2365 __ieee80211_beacon_add_tim(sdata, ps, skb); 2366 } else { 2367 spin_lock_bh(&local->tim_lock); 2368 __ieee80211_beacon_add_tim(sdata, ps, skb); 2369 spin_unlock_bh(&local->tim_lock); 2370 } 2371 2372 return 0; 2373 } 2374 2375 void ieee80211_csa_finish(struct ieee80211_vif *vif) 2376 { 2377 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2378 2379 ieee80211_queue_work(&sdata->local->hw, 2380 &sdata->csa_finalize_work); 2381 } 2382 EXPORT_SYMBOL(ieee80211_csa_finish); 2383 2384 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata, 2385 struct beacon_data *beacon) 2386 { 2387 struct probe_resp *resp; 2388 int counter_offset_beacon = sdata->csa_counter_offset_beacon; 2389 int counter_offset_presp = sdata->csa_counter_offset_presp; 2390 u8 *beacon_data; 2391 size_t beacon_data_len; 2392 2393 switch (sdata->vif.type) { 2394 case NL80211_IFTYPE_AP: 2395 beacon_data = beacon->tail; 2396 beacon_data_len = beacon->tail_len; 2397 break; 2398 case NL80211_IFTYPE_ADHOC: 2399 beacon_data = beacon->head; 2400 beacon_data_len = beacon->head_len; 2401 break; 2402 case NL80211_IFTYPE_MESH_POINT: 2403 beacon_data = beacon->head; 2404 beacon_data_len = beacon->head_len; 2405 break; 2406 default: 2407 return; 2408 } 2409 if (WARN_ON(counter_offset_beacon >= beacon_data_len)) 2410 return; 2411 2412 /* warn if the driver did not check for/react to csa completeness */ 2413 if (WARN_ON(beacon_data[counter_offset_beacon] == 0)) 2414 return; 2415 2416 beacon_data[counter_offset_beacon]--; 2417 2418 if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) { 2419 rcu_read_lock(); 2420 resp = rcu_dereference(sdata->u.ap.probe_resp); 2421 2422 /* if nl80211 accepted the offset, this should not happen. */ 2423 if (WARN_ON(!resp)) { 2424 rcu_read_unlock(); 2425 return; 2426 } 2427 resp->data[counter_offset_presp]--; 2428 rcu_read_unlock(); 2429 } 2430 } 2431 2432 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 2433 { 2434 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2435 struct beacon_data *beacon = NULL; 2436 u8 *beacon_data; 2437 size_t beacon_data_len; 2438 int counter_beacon = sdata->csa_counter_offset_beacon; 2439 int ret = false; 2440 2441 if (!ieee80211_sdata_running(sdata)) 2442 return false; 2443 2444 rcu_read_lock(); 2445 if (vif->type == NL80211_IFTYPE_AP) { 2446 struct ieee80211_if_ap *ap = &sdata->u.ap; 2447 2448 beacon = rcu_dereference(ap->beacon); 2449 if (WARN_ON(!beacon || !beacon->tail)) 2450 goto out; 2451 beacon_data = beacon->tail; 2452 beacon_data_len = beacon->tail_len; 2453 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 2454 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2455 2456 beacon = rcu_dereference(ifibss->presp); 2457 if (!beacon) 2458 goto out; 2459 2460 beacon_data = beacon->head; 2461 beacon_data_len = beacon->head_len; 2462 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 2463 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2464 2465 beacon = rcu_dereference(ifmsh->beacon); 2466 if (!beacon) 2467 goto out; 2468 2469 beacon_data = beacon->head; 2470 beacon_data_len = beacon->head_len; 2471 } else { 2472 WARN_ON(1); 2473 goto out; 2474 } 2475 2476 if (WARN_ON(counter_beacon > beacon_data_len)) 2477 goto out; 2478 2479 if (beacon_data[counter_beacon] == 0) 2480 ret = true; 2481 out: 2482 rcu_read_unlock(); 2483 2484 return ret; 2485 } 2486 EXPORT_SYMBOL(ieee80211_csa_is_complete); 2487 2488 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2489 struct ieee80211_vif *vif, 2490 u16 *tim_offset, u16 *tim_length) 2491 { 2492 struct ieee80211_local *local = hw_to_local(hw); 2493 struct sk_buff *skb = NULL; 2494 struct ieee80211_tx_info *info; 2495 struct ieee80211_sub_if_data *sdata = NULL; 2496 enum ieee80211_band band; 2497 struct ieee80211_tx_rate_control txrc; 2498 struct ieee80211_chanctx_conf *chanctx_conf; 2499 2500 rcu_read_lock(); 2501 2502 sdata = vif_to_sdata(vif); 2503 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2504 2505 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2506 goto out; 2507 2508 if (tim_offset) 2509 *tim_offset = 0; 2510 if (tim_length) 2511 *tim_length = 0; 2512 2513 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2514 struct ieee80211_if_ap *ap = &sdata->u.ap; 2515 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2516 2517 if (beacon) { 2518 if (sdata->vif.csa_active) 2519 ieee80211_update_csa(sdata, beacon); 2520 2521 /* 2522 * headroom, head length, 2523 * tail length and maximum TIM length 2524 */ 2525 skb = dev_alloc_skb(local->tx_headroom + 2526 beacon->head_len + 2527 beacon->tail_len + 256); 2528 if (!skb) 2529 goto out; 2530 2531 skb_reserve(skb, local->tx_headroom); 2532 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2533 beacon->head_len); 2534 2535 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2536 2537 if (tim_offset) 2538 *tim_offset = beacon->head_len; 2539 if (tim_length) 2540 *tim_length = skb->len - beacon->head_len; 2541 2542 if (beacon->tail) 2543 memcpy(skb_put(skb, beacon->tail_len), 2544 beacon->tail, beacon->tail_len); 2545 } else 2546 goto out; 2547 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2548 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2549 struct ieee80211_hdr *hdr; 2550 struct beacon_data *presp = rcu_dereference(ifibss->presp); 2551 2552 if (!presp) 2553 goto out; 2554 2555 if (sdata->vif.csa_active) 2556 ieee80211_update_csa(sdata, presp); 2557 2558 2559 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 2560 if (!skb) 2561 goto out; 2562 skb_reserve(skb, local->tx_headroom); 2563 memcpy(skb_put(skb, presp->head_len), presp->head, 2564 presp->head_len); 2565 2566 hdr = (struct ieee80211_hdr *) skb->data; 2567 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2568 IEEE80211_STYPE_BEACON); 2569 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2570 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2571 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2572 2573 if (!bcn) 2574 goto out; 2575 2576 if (sdata->vif.csa_active) 2577 ieee80211_update_csa(sdata, bcn); 2578 2579 if (ifmsh->sync_ops) 2580 ifmsh->sync_ops->adjust_tbtt( 2581 sdata); 2582 2583 skb = dev_alloc_skb(local->tx_headroom + 2584 bcn->head_len + 2585 256 + /* TIM IE */ 2586 bcn->tail_len); 2587 if (!skb) 2588 goto out; 2589 skb_reserve(skb, local->tx_headroom); 2590 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2591 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2592 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2593 } else { 2594 WARN_ON(1); 2595 goto out; 2596 } 2597 2598 band = chanctx_conf->def.chan->band; 2599 2600 info = IEEE80211_SKB_CB(skb); 2601 2602 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2603 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2604 info->band = band; 2605 2606 memset(&txrc, 0, sizeof(txrc)); 2607 txrc.hw = hw; 2608 txrc.sband = local->hw.wiphy->bands[band]; 2609 txrc.bss_conf = &sdata->vif.bss_conf; 2610 txrc.skb = skb; 2611 txrc.reported_rate.idx = -1; 2612 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2613 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2614 txrc.max_rate_idx = -1; 2615 else 2616 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2617 txrc.bss = true; 2618 rate_control_get_rate(sdata, NULL, &txrc); 2619 2620 info->control.vif = vif; 2621 2622 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2623 IEEE80211_TX_CTL_ASSIGN_SEQ | 2624 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2625 out: 2626 rcu_read_unlock(); 2627 return skb; 2628 } 2629 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2630 2631 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2632 struct ieee80211_vif *vif) 2633 { 2634 struct ieee80211_if_ap *ap = NULL; 2635 struct sk_buff *skb = NULL; 2636 struct probe_resp *presp = NULL; 2637 struct ieee80211_hdr *hdr; 2638 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2639 2640 if (sdata->vif.type != NL80211_IFTYPE_AP) 2641 return NULL; 2642 2643 rcu_read_lock(); 2644 2645 ap = &sdata->u.ap; 2646 presp = rcu_dereference(ap->probe_resp); 2647 if (!presp) 2648 goto out; 2649 2650 skb = dev_alloc_skb(presp->len); 2651 if (!skb) 2652 goto out; 2653 2654 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2655 2656 hdr = (struct ieee80211_hdr *) skb->data; 2657 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2658 2659 out: 2660 rcu_read_unlock(); 2661 return skb; 2662 } 2663 EXPORT_SYMBOL(ieee80211_proberesp_get); 2664 2665 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2666 struct ieee80211_vif *vif) 2667 { 2668 struct ieee80211_sub_if_data *sdata; 2669 struct ieee80211_if_managed *ifmgd; 2670 struct ieee80211_pspoll *pspoll; 2671 struct ieee80211_local *local; 2672 struct sk_buff *skb; 2673 2674 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2675 return NULL; 2676 2677 sdata = vif_to_sdata(vif); 2678 ifmgd = &sdata->u.mgd; 2679 local = sdata->local; 2680 2681 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2682 if (!skb) 2683 return NULL; 2684 2685 skb_reserve(skb, local->hw.extra_tx_headroom); 2686 2687 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2688 memset(pspoll, 0, sizeof(*pspoll)); 2689 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2690 IEEE80211_STYPE_PSPOLL); 2691 pspoll->aid = cpu_to_le16(ifmgd->aid); 2692 2693 /* aid in PS-Poll has its two MSBs each set to 1 */ 2694 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2695 2696 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2697 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2698 2699 return skb; 2700 } 2701 EXPORT_SYMBOL(ieee80211_pspoll_get); 2702 2703 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2704 struct ieee80211_vif *vif) 2705 { 2706 struct ieee80211_hdr_3addr *nullfunc; 2707 struct ieee80211_sub_if_data *sdata; 2708 struct ieee80211_if_managed *ifmgd; 2709 struct ieee80211_local *local; 2710 struct sk_buff *skb; 2711 2712 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2713 return NULL; 2714 2715 sdata = vif_to_sdata(vif); 2716 ifmgd = &sdata->u.mgd; 2717 local = sdata->local; 2718 2719 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2720 if (!skb) 2721 return NULL; 2722 2723 skb_reserve(skb, local->hw.extra_tx_headroom); 2724 2725 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2726 sizeof(*nullfunc)); 2727 memset(nullfunc, 0, sizeof(*nullfunc)); 2728 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2729 IEEE80211_STYPE_NULLFUNC | 2730 IEEE80211_FCTL_TODS); 2731 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2732 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2733 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2734 2735 return skb; 2736 } 2737 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2738 2739 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2740 struct ieee80211_vif *vif, 2741 const u8 *ssid, size_t ssid_len, 2742 size_t tailroom) 2743 { 2744 struct ieee80211_sub_if_data *sdata; 2745 struct ieee80211_local *local; 2746 struct ieee80211_hdr_3addr *hdr; 2747 struct sk_buff *skb; 2748 size_t ie_ssid_len; 2749 u8 *pos; 2750 2751 sdata = vif_to_sdata(vif); 2752 local = sdata->local; 2753 ie_ssid_len = 2 + ssid_len; 2754 2755 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2756 ie_ssid_len + tailroom); 2757 if (!skb) 2758 return NULL; 2759 2760 skb_reserve(skb, local->hw.extra_tx_headroom); 2761 2762 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2763 memset(hdr, 0, sizeof(*hdr)); 2764 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2765 IEEE80211_STYPE_PROBE_REQ); 2766 eth_broadcast_addr(hdr->addr1); 2767 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2768 eth_broadcast_addr(hdr->addr3); 2769 2770 pos = skb_put(skb, ie_ssid_len); 2771 *pos++ = WLAN_EID_SSID; 2772 *pos++ = ssid_len; 2773 if (ssid_len) 2774 memcpy(pos, ssid, ssid_len); 2775 pos += ssid_len; 2776 2777 return skb; 2778 } 2779 EXPORT_SYMBOL(ieee80211_probereq_get); 2780 2781 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2782 const void *frame, size_t frame_len, 2783 const struct ieee80211_tx_info *frame_txctl, 2784 struct ieee80211_rts *rts) 2785 { 2786 const struct ieee80211_hdr *hdr = frame; 2787 2788 rts->frame_control = 2789 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2790 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2791 frame_txctl); 2792 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2793 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2794 } 2795 EXPORT_SYMBOL(ieee80211_rts_get); 2796 2797 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2798 const void *frame, size_t frame_len, 2799 const struct ieee80211_tx_info *frame_txctl, 2800 struct ieee80211_cts *cts) 2801 { 2802 const struct ieee80211_hdr *hdr = frame; 2803 2804 cts->frame_control = 2805 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2806 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2807 frame_len, frame_txctl); 2808 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2809 } 2810 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2811 2812 struct sk_buff * 2813 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2814 struct ieee80211_vif *vif) 2815 { 2816 struct ieee80211_local *local = hw_to_local(hw); 2817 struct sk_buff *skb = NULL; 2818 struct ieee80211_tx_data tx; 2819 struct ieee80211_sub_if_data *sdata; 2820 struct ps_data *ps; 2821 struct ieee80211_tx_info *info; 2822 struct ieee80211_chanctx_conf *chanctx_conf; 2823 2824 sdata = vif_to_sdata(vif); 2825 2826 rcu_read_lock(); 2827 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2828 2829 if (!chanctx_conf) 2830 goto out; 2831 2832 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2833 struct beacon_data *beacon = 2834 rcu_dereference(sdata->u.ap.beacon); 2835 2836 if (!beacon || !beacon->head) 2837 goto out; 2838 2839 ps = &sdata->u.ap.ps; 2840 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2841 ps = &sdata->u.mesh.ps; 2842 } else { 2843 goto out; 2844 } 2845 2846 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2847 goto out; /* send buffered bc/mc only after DTIM beacon */ 2848 2849 while (1) { 2850 skb = skb_dequeue(&ps->bc_buf); 2851 if (!skb) 2852 goto out; 2853 local->total_ps_buffered--; 2854 2855 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2856 struct ieee80211_hdr *hdr = 2857 (struct ieee80211_hdr *) skb->data; 2858 /* more buffered multicast/broadcast frames ==> set 2859 * MoreData flag in IEEE 802.11 header to inform PS 2860 * STAs */ 2861 hdr->frame_control |= 2862 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2863 } 2864 2865 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2866 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2867 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2868 break; 2869 dev_kfree_skb_any(skb); 2870 } 2871 2872 info = IEEE80211_SKB_CB(skb); 2873 2874 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2875 info->band = chanctx_conf->def.chan->band; 2876 2877 if (invoke_tx_handlers(&tx)) 2878 skb = NULL; 2879 out: 2880 rcu_read_unlock(); 2881 2882 return skb; 2883 } 2884 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2885 2886 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2887 struct sk_buff *skb, int tid, 2888 enum ieee80211_band band) 2889 { 2890 int ac = ieee802_1d_to_ac[tid & 7]; 2891 2892 skb_set_mac_header(skb, 0); 2893 skb_set_network_header(skb, 0); 2894 skb_set_transport_header(skb, 0); 2895 2896 skb_set_queue_mapping(skb, ac); 2897 skb->priority = tid; 2898 2899 skb->dev = sdata->dev; 2900 2901 /* 2902 * The other path calling ieee80211_xmit is from the tasklet, 2903 * and while we can handle concurrent transmissions locking 2904 * requirements are that we do not come into tx with bhs on. 2905 */ 2906 local_bh_disable(); 2907 ieee80211_xmit(sdata, skb, band); 2908 local_bh_enable(); 2909 } 2910