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_local *local = tx->local; 467 468 if (unlikely(!sta)) 469 return TX_CONTINUE; 470 471 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 472 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 473 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 474 int ac = skb_get_queue_mapping(tx->skb); 475 476 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 477 sta->sta.addr, sta->sta.aid, ac); 478 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 479 purge_old_ps_buffers(tx->local); 480 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 481 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 482 ps_dbg(tx->sdata, 483 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 484 sta->sta.addr, ac); 485 ieee80211_free_txskb(&local->hw, old); 486 } else 487 tx->local->total_ps_buffered++; 488 489 info->control.jiffies = jiffies; 490 info->control.vif = &tx->sdata->vif; 491 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 492 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 493 494 if (!timer_pending(&local->sta_cleanup)) 495 mod_timer(&local->sta_cleanup, 496 round_jiffies(jiffies + 497 STA_INFO_CLEANUP_INTERVAL)); 498 499 /* 500 * We queued up some frames, so the TIM bit might 501 * need to be set, recalculate it. 502 */ 503 sta_info_recalc_tim(sta); 504 505 return TX_QUEUED; 506 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 507 ps_dbg(tx->sdata, 508 "STA %pM in PS mode, but polling/in SP -> send frame\n", 509 sta->sta.addr); 510 } 511 512 return TX_CONTINUE; 513 } 514 515 static ieee80211_tx_result debug_noinline 516 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 517 { 518 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 519 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 520 521 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 522 return TX_CONTINUE; 523 524 /* only deauth, disassoc and action are bufferable MMPDUs */ 525 if (ieee80211_is_mgmt(hdr->frame_control) && 526 !ieee80211_is_deauth(hdr->frame_control) && 527 !ieee80211_is_disassoc(hdr->frame_control) && 528 !ieee80211_is_action(hdr->frame_control)) { 529 if (tx->flags & IEEE80211_TX_UNICAST) 530 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 531 return TX_CONTINUE; 532 } 533 534 if (tx->flags & IEEE80211_TX_UNICAST) 535 return ieee80211_tx_h_unicast_ps_buf(tx); 536 else 537 return ieee80211_tx_h_multicast_ps_buf(tx); 538 } 539 540 static ieee80211_tx_result debug_noinline 541 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 542 { 543 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 544 545 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 546 if (tx->sdata->control_port_no_encrypt) 547 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 548 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 549 } 550 551 return TX_CONTINUE; 552 } 553 554 static ieee80211_tx_result debug_noinline 555 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 556 { 557 struct ieee80211_key *key; 558 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 559 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 560 561 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 562 tx->key = NULL; 563 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 564 tx->key = key; 565 else if (ieee80211_is_mgmt(hdr->frame_control) && 566 is_multicast_ether_addr(hdr->addr1) && 567 ieee80211_is_robust_mgmt_frame(hdr) && 568 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 569 tx->key = key; 570 else if (is_multicast_ether_addr(hdr->addr1) && 571 (key = rcu_dereference(tx->sdata->default_multicast_key))) 572 tx->key = key; 573 else if (!is_multicast_ether_addr(hdr->addr1) && 574 (key = rcu_dereference(tx->sdata->default_unicast_key))) 575 tx->key = key; 576 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 577 tx->key = NULL; 578 else if (!tx->sdata->drop_unencrypted) 579 tx->key = NULL; 580 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 581 tx->key = NULL; 582 else if (ieee80211_is_robust_mgmt_frame(hdr) && 583 !(ieee80211_is_action(hdr->frame_control) && 584 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 585 tx->key = NULL; 586 else if (ieee80211_is_mgmt(hdr->frame_control) && 587 !ieee80211_is_robust_mgmt_frame(hdr)) 588 tx->key = NULL; 589 else { 590 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 591 return TX_DROP; 592 } 593 594 if (tx->key) { 595 bool skip_hw = false; 596 597 tx->key->tx_rx_count++; 598 /* TODO: add threshold stuff again */ 599 600 switch (tx->key->conf.cipher) { 601 case WLAN_CIPHER_SUITE_WEP40: 602 case WLAN_CIPHER_SUITE_WEP104: 603 case WLAN_CIPHER_SUITE_TKIP: 604 if (!ieee80211_is_data_present(hdr->frame_control)) 605 tx->key = NULL; 606 break; 607 case WLAN_CIPHER_SUITE_CCMP: 608 if (!ieee80211_is_data_present(hdr->frame_control) && 609 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 610 tx->skb)) 611 tx->key = NULL; 612 else 613 skip_hw = (tx->key->conf.flags & 614 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 615 ieee80211_is_mgmt(hdr->frame_control); 616 break; 617 case WLAN_CIPHER_SUITE_AES_CMAC: 618 if (!ieee80211_is_mgmt(hdr->frame_control)) 619 tx->key = NULL; 620 break; 621 } 622 623 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 624 !ieee80211_is_deauth(hdr->frame_control))) 625 return TX_DROP; 626 627 if (!skip_hw && tx->key && 628 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 629 info->control.hw_key = &tx->key->conf; 630 } 631 632 return TX_CONTINUE; 633 } 634 635 static ieee80211_tx_result debug_noinline 636 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 637 { 638 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 639 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 640 struct ieee80211_supported_band *sband; 641 u32 len; 642 struct ieee80211_tx_rate_control txrc; 643 struct ieee80211_sta_rates *ratetbl = NULL; 644 bool assoc = false; 645 646 memset(&txrc, 0, sizeof(txrc)); 647 648 sband = tx->local->hw.wiphy->bands[info->band]; 649 650 len = min_t(u32, tx->skb->len + FCS_LEN, 651 tx->local->hw.wiphy->frag_threshold); 652 653 /* set up the tx rate control struct we give the RC algo */ 654 txrc.hw = &tx->local->hw; 655 txrc.sband = sband; 656 txrc.bss_conf = &tx->sdata->vif.bss_conf; 657 txrc.skb = tx->skb; 658 txrc.reported_rate.idx = -1; 659 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 660 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 661 txrc.max_rate_idx = -1; 662 else 663 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 664 665 if (tx->sdata->rc_has_mcs_mask[info->band]) 666 txrc.rate_idx_mcs_mask = 667 tx->sdata->rc_rateidx_mcs_mask[info->band]; 668 669 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 670 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 671 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 672 673 /* set up RTS protection if desired */ 674 if (len > tx->local->hw.wiphy->rts_threshold) { 675 txrc.rts = true; 676 } 677 678 info->control.use_rts = txrc.rts; 679 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 680 681 /* 682 * Use short preamble if the BSS can handle it, but not for 683 * management frames unless we know the receiver can handle 684 * that -- the management frame might be to a station that 685 * just wants a probe response. 686 */ 687 if (tx->sdata->vif.bss_conf.use_short_preamble && 688 (ieee80211_is_data(hdr->frame_control) || 689 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 690 txrc.short_preamble = true; 691 692 info->control.short_preamble = txrc.short_preamble; 693 694 if (tx->sta) 695 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 696 697 /* 698 * Lets not bother rate control if we're associated and cannot 699 * talk to the sta. This should not happen. 700 */ 701 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 702 !rate_usable_index_exists(sband, &tx->sta->sta), 703 "%s: Dropped data frame as no usable bitrate found while " 704 "scanning and associated. Target station: " 705 "%pM on %d GHz band\n", 706 tx->sdata->name, hdr->addr1, 707 info->band ? 5 : 2)) 708 return TX_DROP; 709 710 /* 711 * If we're associated with the sta at this point we know we can at 712 * least send the frame at the lowest bit rate. 713 */ 714 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 715 716 if (tx->sta && !info->control.skip_table) 717 ratetbl = rcu_dereference(tx->sta->sta.rates); 718 719 if (unlikely(info->control.rates[0].idx < 0)) { 720 if (ratetbl) { 721 struct ieee80211_tx_rate rate = { 722 .idx = ratetbl->rate[0].idx, 723 .flags = ratetbl->rate[0].flags, 724 .count = ratetbl->rate[0].count 725 }; 726 727 if (ratetbl->rate[0].idx < 0) 728 return TX_DROP; 729 730 tx->rate = rate; 731 } else { 732 return TX_DROP; 733 } 734 } else { 735 tx->rate = info->control.rates[0]; 736 } 737 738 if (txrc.reported_rate.idx < 0) { 739 txrc.reported_rate = tx->rate; 740 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 741 tx->sta->last_tx_rate = txrc.reported_rate; 742 } else if (tx->sta) 743 tx->sta->last_tx_rate = txrc.reported_rate; 744 745 if (ratetbl) 746 return TX_CONTINUE; 747 748 if (unlikely(!info->control.rates[0].count)) 749 info->control.rates[0].count = 1; 750 751 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 752 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 753 info->control.rates[0].count = 1; 754 755 return TX_CONTINUE; 756 } 757 758 static ieee80211_tx_result debug_noinline 759 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 760 { 761 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 762 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 763 u16 *seq; 764 u8 *qc; 765 int tid; 766 767 /* 768 * Packet injection may want to control the sequence 769 * number, if we have no matching interface then we 770 * neither assign one ourselves nor ask the driver to. 771 */ 772 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 773 return TX_CONTINUE; 774 775 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 776 return TX_CONTINUE; 777 778 if (ieee80211_hdrlen(hdr->frame_control) < 24) 779 return TX_CONTINUE; 780 781 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 782 return TX_CONTINUE; 783 784 /* 785 * Anything but QoS data that has a sequence number field 786 * (is long enough) gets a sequence number from the global 787 * counter. QoS data frames with a multicast destination 788 * also use the global counter (802.11-2012 9.3.2.10). 789 */ 790 if (!ieee80211_is_data_qos(hdr->frame_control) || 791 is_multicast_ether_addr(hdr->addr1)) { 792 /* driver should assign sequence number */ 793 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 794 /* for pure STA mode without beacons, we can do it */ 795 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 796 tx->sdata->sequence_number += 0x10; 797 return TX_CONTINUE; 798 } 799 800 /* 801 * This should be true for injected/management frames only, for 802 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 803 * above since they are not QoS-data frames. 804 */ 805 if (!tx->sta) 806 return TX_CONTINUE; 807 808 /* include per-STA, per-TID sequence counter */ 809 810 qc = ieee80211_get_qos_ctl(hdr); 811 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 812 seq = &tx->sta->tid_seq[tid]; 813 814 hdr->seq_ctrl = cpu_to_le16(*seq); 815 816 /* Increase the sequence number. */ 817 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 818 819 return TX_CONTINUE; 820 } 821 822 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 823 struct sk_buff *skb, int hdrlen, 824 int frag_threshold) 825 { 826 struct ieee80211_local *local = tx->local; 827 struct ieee80211_tx_info *info; 828 struct sk_buff *tmp; 829 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 830 int pos = hdrlen + per_fragm; 831 int rem = skb->len - hdrlen - per_fragm; 832 833 if (WARN_ON(rem < 0)) 834 return -EINVAL; 835 836 /* first fragment was already added to queue by caller */ 837 838 while (rem) { 839 int fraglen = per_fragm; 840 841 if (fraglen > rem) 842 fraglen = rem; 843 rem -= fraglen; 844 tmp = dev_alloc_skb(local->tx_headroom + 845 frag_threshold + 846 IEEE80211_ENCRYPT_HEADROOM + 847 IEEE80211_ENCRYPT_TAILROOM); 848 if (!tmp) 849 return -ENOMEM; 850 851 __skb_queue_tail(&tx->skbs, tmp); 852 853 skb_reserve(tmp, local->tx_headroom + 854 IEEE80211_ENCRYPT_HEADROOM); 855 /* copy control information */ 856 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 857 858 info = IEEE80211_SKB_CB(tmp); 859 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 860 IEEE80211_TX_CTL_FIRST_FRAGMENT); 861 862 if (rem) 863 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 864 865 skb_copy_queue_mapping(tmp, skb); 866 tmp->priority = skb->priority; 867 tmp->dev = skb->dev; 868 869 /* copy header and data */ 870 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 871 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 872 873 pos += fraglen; 874 } 875 876 /* adjust first fragment's length */ 877 skb->len = hdrlen + per_fragm; 878 return 0; 879 } 880 881 static ieee80211_tx_result debug_noinline 882 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 883 { 884 struct sk_buff *skb = tx->skb; 885 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 886 struct ieee80211_hdr *hdr = (void *)skb->data; 887 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 888 int hdrlen; 889 int fragnum; 890 891 /* no matter what happens, tx->skb moves to tx->skbs */ 892 __skb_queue_tail(&tx->skbs, skb); 893 tx->skb = NULL; 894 895 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 896 return TX_CONTINUE; 897 898 if (tx->local->ops->set_frag_threshold) 899 return TX_CONTINUE; 900 901 /* 902 * Warn when submitting a fragmented A-MPDU frame and drop it. 903 * This scenario is handled in ieee80211_tx_prepare but extra 904 * caution taken here as fragmented ampdu may cause Tx stop. 905 */ 906 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 907 return TX_DROP; 908 909 hdrlen = ieee80211_hdrlen(hdr->frame_control); 910 911 /* internal error, why isn't DONTFRAG set? */ 912 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 913 return TX_DROP; 914 915 /* 916 * Now fragment the frame. This will allocate all the fragments and 917 * chain them (using skb as the first fragment) to skb->next. 918 * During transmission, we will remove the successfully transmitted 919 * fragments from this list. When the low-level driver rejects one 920 * of the fragments then we will simply pretend to accept the skb 921 * but store it away as pending. 922 */ 923 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 924 return TX_DROP; 925 926 /* update duration/seq/flags of fragments */ 927 fragnum = 0; 928 929 skb_queue_walk(&tx->skbs, skb) { 930 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 931 932 hdr = (void *)skb->data; 933 info = IEEE80211_SKB_CB(skb); 934 935 if (!skb_queue_is_last(&tx->skbs, skb)) { 936 hdr->frame_control |= morefrags; 937 /* 938 * No multi-rate retries for fragmented frames, that 939 * would completely throw off the NAV at other STAs. 940 */ 941 info->control.rates[1].idx = -1; 942 info->control.rates[2].idx = -1; 943 info->control.rates[3].idx = -1; 944 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 945 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 946 } else { 947 hdr->frame_control &= ~morefrags; 948 } 949 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 950 fragnum++; 951 } 952 953 return TX_CONTINUE; 954 } 955 956 static ieee80211_tx_result debug_noinline 957 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 958 { 959 struct sk_buff *skb; 960 int ac = -1; 961 962 if (!tx->sta) 963 return TX_CONTINUE; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 ac = skb_get_queue_mapping(skb); 967 tx->sta->tx_fragments++; 968 tx->sta->tx_bytes[ac] += skb->len; 969 } 970 if (ac >= 0) 971 tx->sta->tx_packets[ac]++; 972 973 return TX_CONTINUE; 974 } 975 976 static ieee80211_tx_result debug_noinline 977 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 978 { 979 if (!tx->key) 980 return TX_CONTINUE; 981 982 switch (tx->key->conf.cipher) { 983 case WLAN_CIPHER_SUITE_WEP40: 984 case WLAN_CIPHER_SUITE_WEP104: 985 return ieee80211_crypto_wep_encrypt(tx); 986 case WLAN_CIPHER_SUITE_TKIP: 987 return ieee80211_crypto_tkip_encrypt(tx); 988 case WLAN_CIPHER_SUITE_CCMP: 989 return ieee80211_crypto_ccmp_encrypt(tx); 990 case WLAN_CIPHER_SUITE_AES_CMAC: 991 return ieee80211_crypto_aes_cmac_encrypt(tx); 992 default: 993 return ieee80211_crypto_hw_encrypt(tx); 994 } 995 996 return TX_DROP; 997 } 998 999 static ieee80211_tx_result debug_noinline 1000 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1001 { 1002 struct sk_buff *skb; 1003 struct ieee80211_hdr *hdr; 1004 int next_len; 1005 bool group_addr; 1006 1007 skb_queue_walk(&tx->skbs, skb) { 1008 hdr = (void *) skb->data; 1009 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1010 break; /* must not overwrite AID */ 1011 if (!skb_queue_is_last(&tx->skbs, skb)) { 1012 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1013 next_len = next->len; 1014 } else 1015 next_len = 0; 1016 group_addr = is_multicast_ether_addr(hdr->addr1); 1017 1018 hdr->duration_id = 1019 ieee80211_duration(tx, skb, group_addr, next_len); 1020 } 1021 1022 return TX_CONTINUE; 1023 } 1024 1025 /* actual transmit path */ 1026 1027 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1028 struct sk_buff *skb, 1029 struct ieee80211_tx_info *info, 1030 struct tid_ampdu_tx *tid_tx, 1031 int tid) 1032 { 1033 bool queued = false; 1034 bool reset_agg_timer = false; 1035 struct sk_buff *purge_skb = NULL; 1036 1037 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1038 info->flags |= IEEE80211_TX_CTL_AMPDU; 1039 reset_agg_timer = true; 1040 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1041 /* 1042 * nothing -- this aggregation session is being started 1043 * but that might still fail with the driver 1044 */ 1045 } else { 1046 spin_lock(&tx->sta->lock); 1047 /* 1048 * Need to re-check now, because we may get here 1049 * 1050 * 1) in the window during which the setup is actually 1051 * already done, but not marked yet because not all 1052 * packets are spliced over to the driver pending 1053 * queue yet -- if this happened we acquire the lock 1054 * either before or after the splice happens, but 1055 * need to recheck which of these cases happened. 1056 * 1057 * 2) during session teardown, if the OPERATIONAL bit 1058 * was cleared due to the teardown but the pointer 1059 * hasn't been assigned NULL yet (or we loaded it 1060 * before it was assigned) -- in this case it may 1061 * now be NULL which means we should just let the 1062 * packet pass through because splicing the frames 1063 * back is already done. 1064 */ 1065 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1066 1067 if (!tid_tx) { 1068 /* do nothing, let packet pass through */ 1069 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1070 info->flags |= IEEE80211_TX_CTL_AMPDU; 1071 reset_agg_timer = true; 1072 } else { 1073 queued = true; 1074 info->control.vif = &tx->sdata->vif; 1075 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1076 __skb_queue_tail(&tid_tx->pending, skb); 1077 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1078 purge_skb = __skb_dequeue(&tid_tx->pending); 1079 } 1080 spin_unlock(&tx->sta->lock); 1081 1082 if (purge_skb) 1083 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1084 } 1085 1086 /* reset session timer */ 1087 if (reset_agg_timer && tid_tx->timeout) 1088 tid_tx->last_tx = jiffies; 1089 1090 return queued; 1091 } 1092 1093 /* 1094 * initialises @tx 1095 */ 1096 static ieee80211_tx_result 1097 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1098 struct ieee80211_tx_data *tx, 1099 struct sk_buff *skb) 1100 { 1101 struct ieee80211_local *local = sdata->local; 1102 struct ieee80211_hdr *hdr; 1103 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1104 int tid; 1105 u8 *qc; 1106 1107 memset(tx, 0, sizeof(*tx)); 1108 tx->skb = skb; 1109 tx->local = local; 1110 tx->sdata = sdata; 1111 __skb_queue_head_init(&tx->skbs); 1112 1113 /* 1114 * If this flag is set to true anywhere, and we get here, 1115 * we are doing the needed processing, so remove the flag 1116 * now. 1117 */ 1118 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1119 1120 hdr = (struct ieee80211_hdr *) skb->data; 1121 1122 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1123 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1124 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1125 return TX_DROP; 1126 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED | 1127 IEEE80211_TX_INTFL_NL80211_FRAME_TX) || 1128 tx->sdata->control_port_protocol == tx->skb->protocol) { 1129 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1130 } 1131 if (!tx->sta) 1132 tx->sta = sta_info_get(sdata, hdr->addr1); 1133 1134 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1135 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1136 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1137 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1138 struct tid_ampdu_tx *tid_tx; 1139 1140 qc = ieee80211_get_qos_ctl(hdr); 1141 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1142 1143 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1144 if (tid_tx) { 1145 bool queued; 1146 1147 queued = ieee80211_tx_prep_agg(tx, skb, info, 1148 tid_tx, tid); 1149 1150 if (unlikely(queued)) 1151 return TX_QUEUED; 1152 } 1153 } 1154 1155 if (is_multicast_ether_addr(hdr->addr1)) { 1156 tx->flags &= ~IEEE80211_TX_UNICAST; 1157 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1158 } else 1159 tx->flags |= IEEE80211_TX_UNICAST; 1160 1161 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1162 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1163 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1164 info->flags & IEEE80211_TX_CTL_AMPDU) 1165 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1166 } 1167 1168 if (!tx->sta) 1169 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1170 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1171 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1172 1173 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1174 1175 return TX_CONTINUE; 1176 } 1177 1178 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1179 struct ieee80211_vif *vif, 1180 struct ieee80211_sta *sta, 1181 struct sk_buff_head *skbs, 1182 bool txpending) 1183 { 1184 struct ieee80211_tx_control control; 1185 struct sk_buff *skb, *tmp; 1186 unsigned long flags; 1187 1188 skb_queue_walk_safe(skbs, skb, tmp) { 1189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1190 int q = info->hw_queue; 1191 1192 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1193 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1194 __skb_unlink(skb, skbs); 1195 ieee80211_free_txskb(&local->hw, skb); 1196 continue; 1197 } 1198 #endif 1199 1200 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1201 if (local->queue_stop_reasons[q] || 1202 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1203 if (unlikely(info->flags & 1204 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1205 if (local->queue_stop_reasons[q] & 1206 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1207 /* 1208 * Drop off-channel frames if queues 1209 * are stopped for any reason other 1210 * than off-channel operation. Never 1211 * queue them. 1212 */ 1213 spin_unlock_irqrestore( 1214 &local->queue_stop_reason_lock, 1215 flags); 1216 ieee80211_purge_tx_queue(&local->hw, 1217 skbs); 1218 return true; 1219 } 1220 } else { 1221 1222 /* 1223 * Since queue is stopped, queue up frames for 1224 * later transmission from the tx-pending 1225 * tasklet when the queue is woken again. 1226 */ 1227 if (txpending) 1228 skb_queue_splice_init(skbs, 1229 &local->pending[q]); 1230 else 1231 skb_queue_splice_tail_init(skbs, 1232 &local->pending[q]); 1233 1234 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1235 flags); 1236 return false; 1237 } 1238 } 1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1240 1241 info->control.vif = vif; 1242 control.sta = sta; 1243 1244 __skb_unlink(skb, skbs); 1245 drv_tx(local, &control, skb); 1246 } 1247 1248 return true; 1249 } 1250 1251 /* 1252 * Returns false if the frame couldn't be transmitted but was queued instead. 1253 */ 1254 static bool __ieee80211_tx(struct ieee80211_local *local, 1255 struct sk_buff_head *skbs, int led_len, 1256 struct sta_info *sta, bool txpending) 1257 { 1258 struct ieee80211_tx_info *info; 1259 struct ieee80211_sub_if_data *sdata; 1260 struct ieee80211_vif *vif; 1261 struct ieee80211_sta *pubsta; 1262 struct sk_buff *skb; 1263 bool result = true; 1264 __le16 fc; 1265 1266 if (WARN_ON(skb_queue_empty(skbs))) 1267 return true; 1268 1269 skb = skb_peek(skbs); 1270 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1271 info = IEEE80211_SKB_CB(skb); 1272 sdata = vif_to_sdata(info->control.vif); 1273 if (sta && !sta->uploaded) 1274 sta = NULL; 1275 1276 if (sta) 1277 pubsta = &sta->sta; 1278 else 1279 pubsta = NULL; 1280 1281 switch (sdata->vif.type) { 1282 case NL80211_IFTYPE_MONITOR: 1283 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1284 vif = &sdata->vif; 1285 break; 1286 } 1287 sdata = rcu_dereference(local->monitor_sdata); 1288 if (sdata) { 1289 vif = &sdata->vif; 1290 info->hw_queue = 1291 vif->hw_queue[skb_get_queue_mapping(skb)]; 1292 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1293 dev_kfree_skb(skb); 1294 return true; 1295 } else 1296 vif = NULL; 1297 break; 1298 case NL80211_IFTYPE_AP_VLAN: 1299 sdata = container_of(sdata->bss, 1300 struct ieee80211_sub_if_data, u.ap); 1301 /* fall through */ 1302 default: 1303 vif = &sdata->vif; 1304 break; 1305 } 1306 1307 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1308 txpending); 1309 1310 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1311 1312 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1313 1314 return result; 1315 } 1316 1317 /* 1318 * Invoke TX handlers, return 0 on success and non-zero if the 1319 * frame was dropped or queued. 1320 */ 1321 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1322 { 1323 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1324 ieee80211_tx_result res = TX_DROP; 1325 1326 #define CALL_TXH(txh) \ 1327 do { \ 1328 res = txh(tx); \ 1329 if (res != TX_CONTINUE) \ 1330 goto txh_done; \ 1331 } while (0) 1332 1333 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1334 CALL_TXH(ieee80211_tx_h_check_assoc); 1335 CALL_TXH(ieee80211_tx_h_ps_buf); 1336 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1337 CALL_TXH(ieee80211_tx_h_select_key); 1338 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1339 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1340 1341 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1342 __skb_queue_tail(&tx->skbs, tx->skb); 1343 tx->skb = NULL; 1344 goto txh_done; 1345 } 1346 1347 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1348 CALL_TXH(ieee80211_tx_h_sequence); 1349 CALL_TXH(ieee80211_tx_h_fragment); 1350 /* handlers after fragment must be aware of tx info fragmentation! */ 1351 CALL_TXH(ieee80211_tx_h_stats); 1352 CALL_TXH(ieee80211_tx_h_encrypt); 1353 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1354 CALL_TXH(ieee80211_tx_h_calculate_duration); 1355 #undef CALL_TXH 1356 1357 txh_done: 1358 if (unlikely(res == TX_DROP)) { 1359 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1360 if (tx->skb) 1361 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1362 else 1363 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1364 return -1; 1365 } else if (unlikely(res == TX_QUEUED)) { 1366 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1367 return -1; 1368 } 1369 1370 return 0; 1371 } 1372 1373 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1374 struct ieee80211_vif *vif, struct sk_buff *skb, 1375 int band, struct ieee80211_sta **sta) 1376 { 1377 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1379 struct ieee80211_tx_data tx; 1380 1381 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) 1382 return false; 1383 1384 info->band = band; 1385 info->control.vif = vif; 1386 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1387 1388 if (invoke_tx_handlers(&tx)) 1389 return false; 1390 1391 if (sta) { 1392 if (tx.sta) 1393 *sta = &tx.sta->sta; 1394 else 1395 *sta = NULL; 1396 } 1397 1398 return true; 1399 } 1400 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1401 1402 /* 1403 * Returns false if the frame couldn't be transmitted but was queued instead. 1404 */ 1405 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1406 struct sk_buff *skb, bool txpending, 1407 enum ieee80211_band band) 1408 { 1409 struct ieee80211_local *local = sdata->local; 1410 struct ieee80211_tx_data tx; 1411 ieee80211_tx_result res_prepare; 1412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1413 bool result = true; 1414 int led_len; 1415 1416 if (unlikely(skb->len < 10)) { 1417 dev_kfree_skb(skb); 1418 return true; 1419 } 1420 1421 /* initialises tx */ 1422 led_len = skb->len; 1423 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1424 1425 if (unlikely(res_prepare == TX_DROP)) { 1426 ieee80211_free_txskb(&local->hw, skb); 1427 return true; 1428 } else if (unlikely(res_prepare == TX_QUEUED)) { 1429 return true; 1430 } 1431 1432 info->band = band; 1433 1434 /* set up hw_queue value early */ 1435 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1436 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1437 info->hw_queue = 1438 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1439 1440 if (!invoke_tx_handlers(&tx)) 1441 result = __ieee80211_tx(local, &tx.skbs, led_len, 1442 tx.sta, txpending); 1443 1444 return result; 1445 } 1446 1447 /* device xmit handlers */ 1448 1449 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1450 struct sk_buff *skb, 1451 int head_need, bool may_encrypt) 1452 { 1453 struct ieee80211_local *local = sdata->local; 1454 int tail_need = 0; 1455 1456 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1457 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1458 tail_need -= skb_tailroom(skb); 1459 tail_need = max_t(int, tail_need, 0); 1460 } 1461 1462 if (skb_cloned(skb)) 1463 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1464 else if (head_need || tail_need) 1465 I802_DEBUG_INC(local->tx_expand_skb_head); 1466 else 1467 return 0; 1468 1469 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1470 wiphy_debug(local->hw.wiphy, 1471 "failed to reallocate TX buffer\n"); 1472 return -ENOMEM; 1473 } 1474 1475 return 0; 1476 } 1477 1478 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1479 enum ieee80211_band band) 1480 { 1481 struct ieee80211_local *local = sdata->local; 1482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1484 int headroom; 1485 bool may_encrypt; 1486 1487 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1488 1489 headroom = local->tx_headroom; 1490 if (may_encrypt) 1491 headroom += IEEE80211_ENCRYPT_HEADROOM; 1492 headroom -= skb_headroom(skb); 1493 headroom = max_t(int, 0, headroom); 1494 1495 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1496 ieee80211_free_txskb(&local->hw, skb); 1497 return; 1498 } 1499 1500 hdr = (struct ieee80211_hdr *) skb->data; 1501 info->control.vif = &sdata->vif; 1502 1503 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1504 if (ieee80211_is_data(hdr->frame_control) && 1505 is_unicast_ether_addr(hdr->addr1)) { 1506 if (mesh_nexthop_resolve(sdata, skb)) 1507 return; /* skb queued: don't free */ 1508 } else { 1509 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1510 } 1511 } 1512 1513 ieee80211_set_qos_hdr(sdata, skb); 1514 ieee80211_tx(sdata, skb, false, band); 1515 } 1516 1517 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1518 { 1519 struct ieee80211_radiotap_iterator iterator; 1520 struct ieee80211_radiotap_header *rthdr = 1521 (struct ieee80211_radiotap_header *) skb->data; 1522 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1523 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1524 NULL); 1525 u16 txflags; 1526 1527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1528 IEEE80211_TX_CTL_DONTFRAG; 1529 1530 /* 1531 * for every radiotap entry that is present 1532 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1533 * entries present, or -EINVAL on error) 1534 */ 1535 1536 while (!ret) { 1537 ret = ieee80211_radiotap_iterator_next(&iterator); 1538 1539 if (ret) 1540 continue; 1541 1542 /* see if this argument is something we can use */ 1543 switch (iterator.this_arg_index) { 1544 /* 1545 * You must take care when dereferencing iterator.this_arg 1546 * for multibyte types... the pointer is not aligned. Use 1547 * get_unaligned((type *)iterator.this_arg) to dereference 1548 * iterator.this_arg for type "type" safely on all arches. 1549 */ 1550 case IEEE80211_RADIOTAP_FLAGS: 1551 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1552 /* 1553 * this indicates that the skb we have been 1554 * handed has the 32-bit FCS CRC at the end... 1555 * we should react to that by snipping it off 1556 * because it will be recomputed and added 1557 * on transmission 1558 */ 1559 if (skb->len < (iterator._max_length + FCS_LEN)) 1560 return false; 1561 1562 skb_trim(skb, skb->len - FCS_LEN); 1563 } 1564 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1565 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1566 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1567 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1568 break; 1569 1570 case IEEE80211_RADIOTAP_TX_FLAGS: 1571 txflags = get_unaligned_le16(iterator.this_arg); 1572 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1573 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1574 break; 1575 1576 /* 1577 * Please update the file 1578 * Documentation/networking/mac80211-injection.txt 1579 * when parsing new fields here. 1580 */ 1581 1582 default: 1583 break; 1584 } 1585 } 1586 1587 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1588 return false; 1589 1590 /* 1591 * remove the radiotap header 1592 * iterator->_max_length was sanity-checked against 1593 * skb->len by iterator init 1594 */ 1595 skb_pull(skb, iterator._max_length); 1596 1597 return true; 1598 } 1599 1600 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1601 struct net_device *dev) 1602 { 1603 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1604 struct ieee80211_chanctx_conf *chanctx_conf; 1605 struct ieee80211_channel *chan; 1606 struct ieee80211_radiotap_header *prthdr = 1607 (struct ieee80211_radiotap_header *)skb->data; 1608 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1609 struct ieee80211_hdr *hdr; 1610 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1611 u16 len_rthdr; 1612 int hdrlen; 1613 1614 /* check for not even having the fixed radiotap header part */ 1615 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1616 goto fail; /* too short to be possibly valid */ 1617 1618 /* is it a header version we can trust to find length from? */ 1619 if (unlikely(prthdr->it_version)) 1620 goto fail; /* only version 0 is supported */ 1621 1622 /* then there must be a radiotap header with a length we can use */ 1623 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1624 1625 /* does the skb contain enough to deliver on the alleged length? */ 1626 if (unlikely(skb->len < len_rthdr)) 1627 goto fail; /* skb too short for claimed rt header extent */ 1628 1629 /* 1630 * fix up the pointers accounting for the radiotap 1631 * header still being in there. We are being given 1632 * a precooked IEEE80211 header so no need for 1633 * normal processing 1634 */ 1635 skb_set_mac_header(skb, len_rthdr); 1636 /* 1637 * these are just fixed to the end of the rt area since we 1638 * don't have any better information and at this point, nobody cares 1639 */ 1640 skb_set_network_header(skb, len_rthdr); 1641 skb_set_transport_header(skb, len_rthdr); 1642 1643 if (skb->len < len_rthdr + 2) 1644 goto fail; 1645 1646 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1647 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1648 1649 if (skb->len < len_rthdr + hdrlen) 1650 goto fail; 1651 1652 /* 1653 * Initialize skb->protocol if the injected frame is a data frame 1654 * carrying a rfc1042 header 1655 */ 1656 if (ieee80211_is_data(hdr->frame_control) && 1657 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1658 u8 *payload = (u8 *)hdr + hdrlen; 1659 1660 if (ether_addr_equal(payload, rfc1042_header)) 1661 skb->protocol = cpu_to_be16((payload[6] << 8) | 1662 payload[7]); 1663 } 1664 1665 memset(info, 0, sizeof(*info)); 1666 1667 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1668 IEEE80211_TX_CTL_INJECTED; 1669 1670 /* process and remove the injection radiotap header */ 1671 if (!ieee80211_parse_tx_radiotap(skb)) 1672 goto fail; 1673 1674 rcu_read_lock(); 1675 1676 /* 1677 * We process outgoing injected frames that have a local address 1678 * we handle as though they are non-injected frames. 1679 * This code here isn't entirely correct, the local MAC address 1680 * isn't always enough to find the interface to use; for proper 1681 * VLAN/WDS support we will need a different mechanism (which 1682 * likely isn't going to be monitor interfaces). 1683 */ 1684 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1685 1686 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1687 if (!ieee80211_sdata_running(tmp_sdata)) 1688 continue; 1689 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1690 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1691 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1692 continue; 1693 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1694 sdata = tmp_sdata; 1695 break; 1696 } 1697 } 1698 1699 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1700 if (!chanctx_conf) { 1701 tmp_sdata = rcu_dereference(local->monitor_sdata); 1702 if (tmp_sdata) 1703 chanctx_conf = 1704 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1705 } 1706 1707 if (chanctx_conf) 1708 chan = chanctx_conf->def.chan; 1709 else if (!local->use_chanctx) 1710 chan = local->_oper_chandef.chan; 1711 else 1712 goto fail_rcu; 1713 1714 /* 1715 * Frame injection is not allowed if beaconing is not allowed 1716 * or if we need radar detection. Beaconing is usually not allowed when 1717 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1718 * Passive scan is also used in world regulatory domains where 1719 * your country is not known and as such it should be treated as 1720 * NO TX unless the channel is explicitly allowed in which case 1721 * your current regulatory domain would not have the passive scan 1722 * flag. 1723 * 1724 * Since AP mode uses monitor interfaces to inject/TX management 1725 * frames we can make AP mode the exception to this rule once it 1726 * supports radar detection as its implementation can deal with 1727 * radar detection by itself. We can do that later by adding a 1728 * monitor flag interfaces used for AP support. 1729 */ 1730 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1731 IEEE80211_CHAN_PASSIVE_SCAN))) 1732 goto fail_rcu; 1733 1734 ieee80211_xmit(sdata, skb, chan->band); 1735 rcu_read_unlock(); 1736 1737 return NETDEV_TX_OK; 1738 1739 fail_rcu: 1740 rcu_read_unlock(); 1741 fail: 1742 dev_kfree_skb(skb); 1743 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1744 } 1745 1746 /** 1747 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1748 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1749 * @skb: packet to be sent 1750 * @dev: incoming interface 1751 * 1752 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1753 * not be freed, and caller is responsible for either retrying later or freeing 1754 * skb). 1755 * 1756 * This function takes in an Ethernet header and encapsulates it with suitable 1757 * IEEE 802.11 header based on which interface the packet is coming in. The 1758 * encapsulated packet will then be passed to master interface, wlan#.11, for 1759 * transmission (through low-level driver). 1760 */ 1761 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1762 struct net_device *dev) 1763 { 1764 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1765 struct ieee80211_local *local = sdata->local; 1766 struct ieee80211_tx_info *info; 1767 int head_need; 1768 u16 ethertype, hdrlen, meshhdrlen = 0; 1769 __le16 fc; 1770 struct ieee80211_hdr hdr; 1771 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1772 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1773 const u8 *encaps_data; 1774 int encaps_len, skip_header_bytes; 1775 int nh_pos, h_pos; 1776 struct sta_info *sta = NULL; 1777 bool wme_sta = false, authorized = false, tdls_auth = false; 1778 bool tdls_direct = false; 1779 bool multicast; 1780 u32 info_flags = 0; 1781 u16 info_id = 0; 1782 struct ieee80211_chanctx_conf *chanctx_conf; 1783 struct ieee80211_sub_if_data *ap_sdata; 1784 enum ieee80211_band band; 1785 1786 if (unlikely(skb->len < ETH_HLEN)) 1787 goto fail; 1788 1789 /* convert Ethernet header to proper 802.11 header (based on 1790 * operation mode) */ 1791 ethertype = (skb->data[12] << 8) | skb->data[13]; 1792 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1793 1794 rcu_read_lock(); 1795 1796 switch (sdata->vif.type) { 1797 case NL80211_IFTYPE_AP_VLAN: 1798 sta = rcu_dereference(sdata->u.vlan.sta); 1799 if (sta) { 1800 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1801 /* RA TA DA SA */ 1802 memcpy(hdr.addr1, sta->sta.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 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1808 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1809 } 1810 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1811 u.ap); 1812 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1813 if (!chanctx_conf) 1814 goto fail_rcu; 1815 band = chanctx_conf->def.chan->band; 1816 if (sta) 1817 break; 1818 /* fall through */ 1819 case NL80211_IFTYPE_AP: 1820 if (sdata->vif.type == NL80211_IFTYPE_AP) 1821 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1822 if (!chanctx_conf) 1823 goto fail_rcu; 1824 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1825 /* DA BSSID SA */ 1826 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1827 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1828 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1829 hdrlen = 24; 1830 band = chanctx_conf->def.chan->band; 1831 break; 1832 case NL80211_IFTYPE_WDS: 1833 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1834 /* RA TA DA SA */ 1835 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1836 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1837 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1838 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1839 hdrlen = 30; 1840 /* 1841 * This is the exception! WDS style interfaces are prohibited 1842 * when channel contexts are in used so this must be valid 1843 */ 1844 band = local->hw.conf.chandef.chan->band; 1845 break; 1846 #ifdef CONFIG_MAC80211_MESH 1847 case NL80211_IFTYPE_MESH_POINT: 1848 if (!is_multicast_ether_addr(skb->data)) { 1849 struct sta_info *next_hop; 1850 bool mpp_lookup = true; 1851 1852 mpath = mesh_path_lookup(sdata, skb->data); 1853 if (mpath) { 1854 mpp_lookup = false; 1855 next_hop = rcu_dereference(mpath->next_hop); 1856 if (!next_hop || 1857 !(mpath->flags & (MESH_PATH_ACTIVE | 1858 MESH_PATH_RESOLVING))) 1859 mpp_lookup = true; 1860 } 1861 1862 if (mpp_lookup) 1863 mppath = mpp_path_lookup(sdata, skb->data); 1864 1865 if (mppath && mpath) 1866 mesh_path_del(mpath->sdata, mpath->dst); 1867 } 1868 1869 /* 1870 * Use address extension if it is a packet from 1871 * another interface or if we know the destination 1872 * is being proxied by a portal (i.e. portal address 1873 * differs from proxied address) 1874 */ 1875 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1876 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1877 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1878 skb->data, skb->data + ETH_ALEN); 1879 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1880 NULL, NULL); 1881 } else { 1882 /* DS -> MBSS (802.11-2012 13.11.3.3). 1883 * For unicast with unknown forwarding information, 1884 * destination might be in the MBSS or if that fails 1885 * forwarded to another mesh gate. In either case 1886 * resolution will be handled in ieee80211_xmit(), so 1887 * leave the original DA. This also works for mcast */ 1888 const u8 *mesh_da = skb->data; 1889 1890 if (mppath) 1891 mesh_da = mppath->mpp; 1892 else if (mpath) 1893 mesh_da = mpath->dst; 1894 1895 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1896 mesh_da, sdata->vif.addr); 1897 if (is_multicast_ether_addr(mesh_da)) 1898 /* DA TA mSA AE:SA */ 1899 meshhdrlen = ieee80211_new_mesh_header( 1900 sdata, &mesh_hdr, 1901 skb->data + ETH_ALEN, NULL); 1902 else 1903 /* RA TA mDA mSA AE:DA SA */ 1904 meshhdrlen = ieee80211_new_mesh_header( 1905 sdata, &mesh_hdr, skb->data, 1906 skb->data + ETH_ALEN); 1907 1908 } 1909 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1910 if (!chanctx_conf) 1911 goto fail_rcu; 1912 band = chanctx_conf->def.chan->band; 1913 break; 1914 #endif 1915 case NL80211_IFTYPE_STATION: 1916 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1917 bool tdls_peer = false; 1918 1919 sta = sta_info_get(sdata, skb->data); 1920 if (sta) { 1921 authorized = test_sta_flag(sta, 1922 WLAN_STA_AUTHORIZED); 1923 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1924 tdls_peer = test_sta_flag(sta, 1925 WLAN_STA_TDLS_PEER); 1926 tdls_auth = test_sta_flag(sta, 1927 WLAN_STA_TDLS_PEER_AUTH); 1928 } 1929 1930 /* 1931 * If the TDLS link is enabled, send everything 1932 * directly. Otherwise, allow TDLS setup frames 1933 * to be transmitted indirectly. 1934 */ 1935 tdls_direct = tdls_peer && (tdls_auth || 1936 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1937 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1938 } 1939 1940 if (tdls_direct) { 1941 /* link during setup - throw out frames to peer */ 1942 if (!tdls_auth) 1943 goto fail_rcu; 1944 1945 /* DA SA BSSID */ 1946 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1947 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1948 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1949 hdrlen = 24; 1950 } else if (sdata->u.mgd.use_4addr && 1951 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1952 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1953 IEEE80211_FCTL_TODS); 1954 /* RA TA DA SA */ 1955 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1956 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1957 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1958 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1959 hdrlen = 30; 1960 } else { 1961 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1962 /* BSSID SA DA */ 1963 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1964 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1965 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1966 hdrlen = 24; 1967 } 1968 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1969 if (!chanctx_conf) 1970 goto fail_rcu; 1971 band = chanctx_conf->def.chan->band; 1972 break; 1973 case NL80211_IFTYPE_ADHOC: 1974 /* DA SA BSSID */ 1975 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1976 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1977 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1978 hdrlen = 24; 1979 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1980 if (!chanctx_conf) 1981 goto fail_rcu; 1982 band = chanctx_conf->def.chan->band; 1983 break; 1984 default: 1985 goto fail_rcu; 1986 } 1987 1988 /* 1989 * There's no need to try to look up the destination 1990 * if it is a multicast address (which can only happen 1991 * in AP mode) 1992 */ 1993 multicast = is_multicast_ether_addr(hdr.addr1); 1994 if (!multicast) { 1995 sta = sta_info_get(sdata, hdr.addr1); 1996 if (sta) { 1997 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1998 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1999 } 2000 } 2001 2002 /* For mesh, the use of the QoS header is mandatory */ 2003 if (ieee80211_vif_is_mesh(&sdata->vif)) 2004 wme_sta = true; 2005 2006 /* receiver and we are QoS enabled, use a QoS type frame */ 2007 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 2008 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2009 hdrlen += 2; 2010 } 2011 2012 /* 2013 * Drop unicast frames to unauthorised stations unless they are 2014 * EAPOL frames from the local station. 2015 */ 2016 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2017 !multicast && !authorized && 2018 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2019 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2020 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2021 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2022 dev->name, hdr.addr1); 2023 #endif 2024 2025 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2026 2027 goto fail_rcu; 2028 } 2029 2030 if (unlikely(!multicast && skb->sk && 2031 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2032 struct sk_buff *orig_skb = skb; 2033 2034 skb = skb_clone(skb, GFP_ATOMIC); 2035 if (skb) { 2036 unsigned long flags; 2037 int id; 2038 2039 spin_lock_irqsave(&local->ack_status_lock, flags); 2040 id = idr_alloc(&local->ack_status_frames, orig_skb, 2041 1, 0x10000, GFP_ATOMIC); 2042 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2043 2044 if (id >= 0) { 2045 info_id = id; 2046 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2047 } else if (skb_shared(skb)) { 2048 kfree_skb(orig_skb); 2049 } else { 2050 kfree_skb(skb); 2051 skb = orig_skb; 2052 } 2053 } else { 2054 /* couldn't clone -- lose tx status ... */ 2055 skb = orig_skb; 2056 } 2057 } 2058 2059 /* 2060 * If the skb is shared we need to obtain our own copy. 2061 */ 2062 if (skb_shared(skb)) { 2063 struct sk_buff *tmp_skb = skb; 2064 2065 /* can't happen -- skb is a clone if info_id != 0 */ 2066 WARN_ON(info_id); 2067 2068 skb = skb_clone(skb, GFP_ATOMIC); 2069 kfree_skb(tmp_skb); 2070 2071 if (!skb) 2072 goto fail_rcu; 2073 } 2074 2075 hdr.frame_control = fc; 2076 hdr.duration_id = 0; 2077 hdr.seq_ctrl = 0; 2078 2079 skip_header_bytes = ETH_HLEN; 2080 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2081 encaps_data = bridge_tunnel_header; 2082 encaps_len = sizeof(bridge_tunnel_header); 2083 skip_header_bytes -= 2; 2084 } else if (ethertype >= ETH_P_802_3_MIN) { 2085 encaps_data = rfc1042_header; 2086 encaps_len = sizeof(rfc1042_header); 2087 skip_header_bytes -= 2; 2088 } else { 2089 encaps_data = NULL; 2090 encaps_len = 0; 2091 } 2092 2093 nh_pos = skb_network_header(skb) - skb->data; 2094 h_pos = skb_transport_header(skb) - skb->data; 2095 2096 skb_pull(skb, skip_header_bytes); 2097 nh_pos -= skip_header_bytes; 2098 h_pos -= skip_header_bytes; 2099 2100 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2101 2102 /* 2103 * So we need to modify the skb header and hence need a copy of 2104 * that. The head_need variable above doesn't, so far, include 2105 * the needed header space that we don't need right away. If we 2106 * can, then we don't reallocate right now but only after the 2107 * frame arrives at the master device (if it does...) 2108 * 2109 * If we cannot, however, then we will reallocate to include all 2110 * the ever needed space. Also, if we need to reallocate it anyway, 2111 * make it big enough for everything we may ever need. 2112 */ 2113 2114 if (head_need > 0 || skb_cloned(skb)) { 2115 head_need += IEEE80211_ENCRYPT_HEADROOM; 2116 head_need += local->tx_headroom; 2117 head_need = max_t(int, 0, head_need); 2118 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2119 ieee80211_free_txskb(&local->hw, skb); 2120 skb = NULL; 2121 goto fail_rcu; 2122 } 2123 } 2124 2125 if (encaps_data) { 2126 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2127 nh_pos += encaps_len; 2128 h_pos += encaps_len; 2129 } 2130 2131 #ifdef CONFIG_MAC80211_MESH 2132 if (meshhdrlen > 0) { 2133 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2134 nh_pos += meshhdrlen; 2135 h_pos += meshhdrlen; 2136 } 2137 #endif 2138 2139 if (ieee80211_is_data_qos(fc)) { 2140 __le16 *qos_control; 2141 2142 qos_control = (__le16*) skb_push(skb, 2); 2143 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2144 /* 2145 * Maybe we could actually set some fields here, for now just 2146 * initialise to zero to indicate no special operation. 2147 */ 2148 *qos_control = 0; 2149 } else 2150 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2151 2152 nh_pos += hdrlen; 2153 h_pos += hdrlen; 2154 2155 dev->stats.tx_packets++; 2156 dev->stats.tx_bytes += skb->len; 2157 2158 /* Update skb pointers to various headers since this modified frame 2159 * is going to go through Linux networking code that may potentially 2160 * need things like pointer to IP header. */ 2161 skb_set_mac_header(skb, 0); 2162 skb_set_network_header(skb, nh_pos); 2163 skb_set_transport_header(skb, h_pos); 2164 2165 info = IEEE80211_SKB_CB(skb); 2166 memset(info, 0, sizeof(*info)); 2167 2168 dev->trans_start = jiffies; 2169 2170 info->flags = info_flags; 2171 info->ack_frame_id = info_id; 2172 2173 ieee80211_xmit(sdata, skb, band); 2174 rcu_read_unlock(); 2175 2176 return NETDEV_TX_OK; 2177 2178 fail_rcu: 2179 rcu_read_unlock(); 2180 fail: 2181 dev_kfree_skb(skb); 2182 return NETDEV_TX_OK; 2183 } 2184 2185 2186 /* 2187 * ieee80211_clear_tx_pending may not be called in a context where 2188 * it is possible that it packets could come in again. 2189 */ 2190 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2191 { 2192 struct sk_buff *skb; 2193 int i; 2194 2195 for (i = 0; i < local->hw.queues; i++) { 2196 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2197 ieee80211_free_txskb(&local->hw, skb); 2198 } 2199 } 2200 2201 /* 2202 * Returns false if the frame couldn't be transmitted but was queued instead, 2203 * which in this case means re-queued -- take as an indication to stop sending 2204 * more pending frames. 2205 */ 2206 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2207 struct sk_buff *skb) 2208 { 2209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2210 struct ieee80211_sub_if_data *sdata; 2211 struct sta_info *sta; 2212 struct ieee80211_hdr *hdr; 2213 bool result; 2214 struct ieee80211_chanctx_conf *chanctx_conf; 2215 2216 sdata = vif_to_sdata(info->control.vif); 2217 2218 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2219 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2220 if (unlikely(!chanctx_conf)) { 2221 dev_kfree_skb(skb); 2222 return true; 2223 } 2224 result = ieee80211_tx(sdata, skb, true, 2225 chanctx_conf->def.chan->band); 2226 } else { 2227 struct sk_buff_head skbs; 2228 2229 __skb_queue_head_init(&skbs); 2230 __skb_queue_tail(&skbs, skb); 2231 2232 hdr = (struct ieee80211_hdr *)skb->data; 2233 sta = sta_info_get(sdata, hdr->addr1); 2234 2235 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2236 } 2237 2238 return result; 2239 } 2240 2241 /* 2242 * Transmit all pending packets. Called from tasklet. 2243 */ 2244 void ieee80211_tx_pending(unsigned long data) 2245 { 2246 struct ieee80211_local *local = (struct ieee80211_local *)data; 2247 unsigned long flags; 2248 int i; 2249 bool txok; 2250 2251 rcu_read_lock(); 2252 2253 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2254 for (i = 0; i < local->hw.queues; i++) { 2255 /* 2256 * If queue is stopped by something other than due to pending 2257 * frames, or we have no pending frames, proceed to next queue. 2258 */ 2259 if (local->queue_stop_reasons[i] || 2260 skb_queue_empty(&local->pending[i])) 2261 continue; 2262 2263 while (!skb_queue_empty(&local->pending[i])) { 2264 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2265 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2266 2267 if (WARN_ON(!info->control.vif)) { 2268 ieee80211_free_txskb(&local->hw, skb); 2269 continue; 2270 } 2271 2272 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2273 flags); 2274 2275 txok = ieee80211_tx_pending_skb(local, skb); 2276 spin_lock_irqsave(&local->queue_stop_reason_lock, 2277 flags); 2278 if (!txok) 2279 break; 2280 } 2281 2282 if (skb_queue_empty(&local->pending[i])) 2283 ieee80211_propagate_queue_wake(local, i); 2284 } 2285 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2286 2287 rcu_read_unlock(); 2288 } 2289 2290 /* functions for drivers to get certain frames */ 2291 2292 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2293 struct ps_data *ps, struct sk_buff *skb) 2294 { 2295 u8 *pos, *tim; 2296 int aid0 = 0; 2297 int i, have_bits = 0, n1, n2; 2298 2299 /* Generate bitmap for TIM only if there are any STAs in power save 2300 * mode. */ 2301 if (atomic_read(&ps->num_sta_ps) > 0) 2302 /* in the hope that this is faster than 2303 * checking byte-for-byte */ 2304 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2305 IEEE80211_MAX_AID+1); 2306 2307 if (ps->dtim_count == 0) 2308 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2309 else 2310 ps->dtim_count--; 2311 2312 tim = pos = (u8 *) skb_put(skb, 6); 2313 *pos++ = WLAN_EID_TIM; 2314 *pos++ = 4; 2315 *pos++ = ps->dtim_count; 2316 *pos++ = sdata->vif.bss_conf.dtim_period; 2317 2318 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2319 aid0 = 1; 2320 2321 ps->dtim_bc_mc = aid0 == 1; 2322 2323 if (have_bits) { 2324 /* Find largest even number N1 so that bits numbered 1 through 2325 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2326 * (N2 + 1) x 8 through 2007 are 0. */ 2327 n1 = 0; 2328 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2329 if (ps->tim[i]) { 2330 n1 = i & 0xfe; 2331 break; 2332 } 2333 } 2334 n2 = n1; 2335 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2336 if (ps->tim[i]) { 2337 n2 = i; 2338 break; 2339 } 2340 } 2341 2342 /* Bitmap control */ 2343 *pos++ = n1 | aid0; 2344 /* Part Virt Bitmap */ 2345 skb_put(skb, n2 - n1); 2346 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2347 2348 tim[1] = n2 - n1 + 4; 2349 } else { 2350 *pos++ = aid0; /* Bitmap control */ 2351 *pos++ = 0; /* Part Virt Bitmap */ 2352 } 2353 } 2354 2355 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2356 struct ps_data *ps, struct sk_buff *skb) 2357 { 2358 struct ieee80211_local *local = sdata->local; 2359 2360 /* 2361 * Not very nice, but we want to allow the driver to call 2362 * ieee80211_beacon_get() as a response to the set_tim() 2363 * callback. That, however, is already invoked under the 2364 * sta_lock to guarantee consistent and race-free update 2365 * of the tim bitmap in mac80211 and the driver. 2366 */ 2367 if (local->tim_in_locked_section) { 2368 __ieee80211_beacon_add_tim(sdata, ps, skb); 2369 } else { 2370 spin_lock_bh(&local->tim_lock); 2371 __ieee80211_beacon_add_tim(sdata, ps, skb); 2372 spin_unlock_bh(&local->tim_lock); 2373 } 2374 2375 return 0; 2376 } 2377 2378 void ieee80211_csa_finish(struct ieee80211_vif *vif) 2379 { 2380 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2381 2382 ieee80211_queue_work(&sdata->local->hw, 2383 &sdata->csa_finalize_work); 2384 } 2385 EXPORT_SYMBOL(ieee80211_csa_finish); 2386 2387 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata, 2388 struct beacon_data *beacon) 2389 { 2390 struct probe_resp *resp; 2391 int counter_offset_beacon = sdata->csa_counter_offset_beacon; 2392 int counter_offset_presp = sdata->csa_counter_offset_presp; 2393 u8 *beacon_data; 2394 size_t beacon_data_len; 2395 2396 switch (sdata->vif.type) { 2397 case NL80211_IFTYPE_AP: 2398 beacon_data = beacon->tail; 2399 beacon_data_len = beacon->tail_len; 2400 break; 2401 case NL80211_IFTYPE_ADHOC: 2402 beacon_data = beacon->head; 2403 beacon_data_len = beacon->head_len; 2404 break; 2405 case NL80211_IFTYPE_MESH_POINT: 2406 beacon_data = beacon->head; 2407 beacon_data_len = beacon->head_len; 2408 break; 2409 default: 2410 return; 2411 } 2412 if (WARN_ON(counter_offset_beacon >= beacon_data_len)) 2413 return; 2414 2415 /* warn if the driver did not check for/react to csa completeness */ 2416 if (WARN_ON(beacon_data[counter_offset_beacon] == 0)) 2417 return; 2418 2419 beacon_data[counter_offset_beacon]--; 2420 2421 if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) { 2422 rcu_read_lock(); 2423 resp = rcu_dereference(sdata->u.ap.probe_resp); 2424 2425 /* if nl80211 accepted the offset, this should not happen. */ 2426 if (WARN_ON(!resp)) { 2427 rcu_read_unlock(); 2428 return; 2429 } 2430 resp->data[counter_offset_presp]--; 2431 rcu_read_unlock(); 2432 } 2433 } 2434 2435 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 2436 { 2437 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2438 struct beacon_data *beacon = NULL; 2439 u8 *beacon_data; 2440 size_t beacon_data_len; 2441 int counter_beacon = sdata->csa_counter_offset_beacon; 2442 int ret = false; 2443 2444 if (!ieee80211_sdata_running(sdata)) 2445 return false; 2446 2447 rcu_read_lock(); 2448 if (vif->type == NL80211_IFTYPE_AP) { 2449 struct ieee80211_if_ap *ap = &sdata->u.ap; 2450 2451 beacon = rcu_dereference(ap->beacon); 2452 if (WARN_ON(!beacon || !beacon->tail)) 2453 goto out; 2454 beacon_data = beacon->tail; 2455 beacon_data_len = beacon->tail_len; 2456 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 2457 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2458 2459 beacon = rcu_dereference(ifibss->presp); 2460 if (!beacon) 2461 goto out; 2462 2463 beacon_data = beacon->head; 2464 beacon_data_len = beacon->head_len; 2465 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 2466 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2467 2468 beacon = rcu_dereference(ifmsh->beacon); 2469 if (!beacon) 2470 goto out; 2471 2472 beacon_data = beacon->head; 2473 beacon_data_len = beacon->head_len; 2474 } else { 2475 WARN_ON(1); 2476 goto out; 2477 } 2478 2479 if (WARN_ON(counter_beacon > beacon_data_len)) 2480 goto out; 2481 2482 if (beacon_data[counter_beacon] == 0) 2483 ret = true; 2484 out: 2485 rcu_read_unlock(); 2486 2487 return ret; 2488 } 2489 EXPORT_SYMBOL(ieee80211_csa_is_complete); 2490 2491 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2492 struct ieee80211_vif *vif, 2493 u16 *tim_offset, u16 *tim_length) 2494 { 2495 struct ieee80211_local *local = hw_to_local(hw); 2496 struct sk_buff *skb = NULL; 2497 struct ieee80211_tx_info *info; 2498 struct ieee80211_sub_if_data *sdata = NULL; 2499 enum ieee80211_band band; 2500 struct ieee80211_tx_rate_control txrc; 2501 struct ieee80211_chanctx_conf *chanctx_conf; 2502 2503 rcu_read_lock(); 2504 2505 sdata = vif_to_sdata(vif); 2506 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2507 2508 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2509 goto out; 2510 2511 if (tim_offset) 2512 *tim_offset = 0; 2513 if (tim_length) 2514 *tim_length = 0; 2515 2516 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2517 struct ieee80211_if_ap *ap = &sdata->u.ap; 2518 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2519 2520 if (beacon) { 2521 if (sdata->vif.csa_active) 2522 ieee80211_update_csa(sdata, beacon); 2523 2524 /* 2525 * headroom, head length, 2526 * tail length and maximum TIM length 2527 */ 2528 skb = dev_alloc_skb(local->tx_headroom + 2529 beacon->head_len + 2530 beacon->tail_len + 256); 2531 if (!skb) 2532 goto out; 2533 2534 skb_reserve(skb, local->tx_headroom); 2535 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2536 beacon->head_len); 2537 2538 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2539 2540 if (tim_offset) 2541 *tim_offset = beacon->head_len; 2542 if (tim_length) 2543 *tim_length = skb->len - beacon->head_len; 2544 2545 if (beacon->tail) 2546 memcpy(skb_put(skb, beacon->tail_len), 2547 beacon->tail, beacon->tail_len); 2548 } else 2549 goto out; 2550 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2551 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2552 struct ieee80211_hdr *hdr; 2553 struct beacon_data *presp = rcu_dereference(ifibss->presp); 2554 2555 if (!presp) 2556 goto out; 2557 2558 if (sdata->vif.csa_active) 2559 ieee80211_update_csa(sdata, presp); 2560 2561 2562 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 2563 if (!skb) 2564 goto out; 2565 skb_reserve(skb, local->tx_headroom); 2566 memcpy(skb_put(skb, presp->head_len), presp->head, 2567 presp->head_len); 2568 2569 hdr = (struct ieee80211_hdr *) skb->data; 2570 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2571 IEEE80211_STYPE_BEACON); 2572 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2573 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2574 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2575 2576 if (!bcn) 2577 goto out; 2578 2579 if (sdata->vif.csa_active) 2580 ieee80211_update_csa(sdata, bcn); 2581 2582 if (ifmsh->sync_ops) 2583 ifmsh->sync_ops->adjust_tbtt( 2584 sdata); 2585 2586 skb = dev_alloc_skb(local->tx_headroom + 2587 bcn->head_len + 2588 256 + /* TIM IE */ 2589 bcn->tail_len); 2590 if (!skb) 2591 goto out; 2592 skb_reserve(skb, local->tx_headroom); 2593 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2594 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2595 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2596 } else { 2597 WARN_ON(1); 2598 goto out; 2599 } 2600 2601 band = chanctx_conf->def.chan->band; 2602 2603 info = IEEE80211_SKB_CB(skb); 2604 2605 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2606 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2607 info->band = band; 2608 2609 memset(&txrc, 0, sizeof(txrc)); 2610 txrc.hw = hw; 2611 txrc.sband = local->hw.wiphy->bands[band]; 2612 txrc.bss_conf = &sdata->vif.bss_conf; 2613 txrc.skb = skb; 2614 txrc.reported_rate.idx = -1; 2615 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2616 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2617 txrc.max_rate_idx = -1; 2618 else 2619 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2620 txrc.bss = true; 2621 rate_control_get_rate(sdata, NULL, &txrc); 2622 2623 info->control.vif = vif; 2624 2625 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2626 IEEE80211_TX_CTL_ASSIGN_SEQ | 2627 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2628 out: 2629 rcu_read_unlock(); 2630 return skb; 2631 } 2632 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2633 2634 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2635 struct ieee80211_vif *vif) 2636 { 2637 struct ieee80211_if_ap *ap = NULL; 2638 struct sk_buff *skb = NULL; 2639 struct probe_resp *presp = NULL; 2640 struct ieee80211_hdr *hdr; 2641 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2642 2643 if (sdata->vif.type != NL80211_IFTYPE_AP) 2644 return NULL; 2645 2646 rcu_read_lock(); 2647 2648 ap = &sdata->u.ap; 2649 presp = rcu_dereference(ap->probe_resp); 2650 if (!presp) 2651 goto out; 2652 2653 skb = dev_alloc_skb(presp->len); 2654 if (!skb) 2655 goto out; 2656 2657 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2658 2659 hdr = (struct ieee80211_hdr *) skb->data; 2660 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2661 2662 out: 2663 rcu_read_unlock(); 2664 return skb; 2665 } 2666 EXPORT_SYMBOL(ieee80211_proberesp_get); 2667 2668 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2669 struct ieee80211_vif *vif) 2670 { 2671 struct ieee80211_sub_if_data *sdata; 2672 struct ieee80211_if_managed *ifmgd; 2673 struct ieee80211_pspoll *pspoll; 2674 struct ieee80211_local *local; 2675 struct sk_buff *skb; 2676 2677 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2678 return NULL; 2679 2680 sdata = vif_to_sdata(vif); 2681 ifmgd = &sdata->u.mgd; 2682 local = sdata->local; 2683 2684 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2685 if (!skb) 2686 return NULL; 2687 2688 skb_reserve(skb, local->hw.extra_tx_headroom); 2689 2690 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2691 memset(pspoll, 0, sizeof(*pspoll)); 2692 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2693 IEEE80211_STYPE_PSPOLL); 2694 pspoll->aid = cpu_to_le16(ifmgd->aid); 2695 2696 /* aid in PS-Poll has its two MSBs each set to 1 */ 2697 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2698 2699 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2700 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2701 2702 return skb; 2703 } 2704 EXPORT_SYMBOL(ieee80211_pspoll_get); 2705 2706 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2707 struct ieee80211_vif *vif) 2708 { 2709 struct ieee80211_hdr_3addr *nullfunc; 2710 struct ieee80211_sub_if_data *sdata; 2711 struct ieee80211_if_managed *ifmgd; 2712 struct ieee80211_local *local; 2713 struct sk_buff *skb; 2714 2715 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2716 return NULL; 2717 2718 sdata = vif_to_sdata(vif); 2719 ifmgd = &sdata->u.mgd; 2720 local = sdata->local; 2721 2722 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2723 if (!skb) 2724 return NULL; 2725 2726 skb_reserve(skb, local->hw.extra_tx_headroom); 2727 2728 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2729 sizeof(*nullfunc)); 2730 memset(nullfunc, 0, sizeof(*nullfunc)); 2731 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2732 IEEE80211_STYPE_NULLFUNC | 2733 IEEE80211_FCTL_TODS); 2734 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2735 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2736 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2737 2738 return skb; 2739 } 2740 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2741 2742 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2743 struct ieee80211_vif *vif, 2744 const u8 *ssid, size_t ssid_len, 2745 size_t tailroom) 2746 { 2747 struct ieee80211_sub_if_data *sdata; 2748 struct ieee80211_local *local; 2749 struct ieee80211_hdr_3addr *hdr; 2750 struct sk_buff *skb; 2751 size_t ie_ssid_len; 2752 u8 *pos; 2753 2754 sdata = vif_to_sdata(vif); 2755 local = sdata->local; 2756 ie_ssid_len = 2 + ssid_len; 2757 2758 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2759 ie_ssid_len + tailroom); 2760 if (!skb) 2761 return NULL; 2762 2763 skb_reserve(skb, local->hw.extra_tx_headroom); 2764 2765 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2766 memset(hdr, 0, sizeof(*hdr)); 2767 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2768 IEEE80211_STYPE_PROBE_REQ); 2769 eth_broadcast_addr(hdr->addr1); 2770 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2771 eth_broadcast_addr(hdr->addr3); 2772 2773 pos = skb_put(skb, ie_ssid_len); 2774 *pos++ = WLAN_EID_SSID; 2775 *pos++ = ssid_len; 2776 if (ssid_len) 2777 memcpy(pos, ssid, ssid_len); 2778 pos += ssid_len; 2779 2780 return skb; 2781 } 2782 EXPORT_SYMBOL(ieee80211_probereq_get); 2783 2784 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2785 const void *frame, size_t frame_len, 2786 const struct ieee80211_tx_info *frame_txctl, 2787 struct ieee80211_rts *rts) 2788 { 2789 const struct ieee80211_hdr *hdr = frame; 2790 2791 rts->frame_control = 2792 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2793 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2794 frame_txctl); 2795 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2796 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2797 } 2798 EXPORT_SYMBOL(ieee80211_rts_get); 2799 2800 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2801 const void *frame, size_t frame_len, 2802 const struct ieee80211_tx_info *frame_txctl, 2803 struct ieee80211_cts *cts) 2804 { 2805 const struct ieee80211_hdr *hdr = frame; 2806 2807 cts->frame_control = 2808 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2809 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2810 frame_len, frame_txctl); 2811 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2812 } 2813 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2814 2815 struct sk_buff * 2816 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2817 struct ieee80211_vif *vif) 2818 { 2819 struct ieee80211_local *local = hw_to_local(hw); 2820 struct sk_buff *skb = NULL; 2821 struct ieee80211_tx_data tx; 2822 struct ieee80211_sub_if_data *sdata; 2823 struct ps_data *ps; 2824 struct ieee80211_tx_info *info; 2825 struct ieee80211_chanctx_conf *chanctx_conf; 2826 2827 sdata = vif_to_sdata(vif); 2828 2829 rcu_read_lock(); 2830 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2831 2832 if (!chanctx_conf) 2833 goto out; 2834 2835 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2836 struct beacon_data *beacon = 2837 rcu_dereference(sdata->u.ap.beacon); 2838 2839 if (!beacon || !beacon->head) 2840 goto out; 2841 2842 ps = &sdata->u.ap.ps; 2843 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2844 ps = &sdata->u.mesh.ps; 2845 } else { 2846 goto out; 2847 } 2848 2849 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2850 goto out; /* send buffered bc/mc only after DTIM beacon */ 2851 2852 while (1) { 2853 skb = skb_dequeue(&ps->bc_buf); 2854 if (!skb) 2855 goto out; 2856 local->total_ps_buffered--; 2857 2858 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2859 struct ieee80211_hdr *hdr = 2860 (struct ieee80211_hdr *) skb->data; 2861 /* more buffered multicast/broadcast frames ==> set 2862 * MoreData flag in IEEE 802.11 header to inform PS 2863 * STAs */ 2864 hdr->frame_control |= 2865 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2866 } 2867 2868 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2869 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2870 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2871 break; 2872 dev_kfree_skb_any(skb); 2873 } 2874 2875 info = IEEE80211_SKB_CB(skb); 2876 2877 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2878 info->band = chanctx_conf->def.chan->band; 2879 2880 if (invoke_tx_handlers(&tx)) 2881 skb = NULL; 2882 out: 2883 rcu_read_unlock(); 2884 2885 return skb; 2886 } 2887 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2888 2889 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2890 struct sk_buff *skb, int tid, 2891 enum ieee80211_band band) 2892 { 2893 int ac = ieee802_1d_to_ac[tid & 7]; 2894 2895 skb_set_mac_header(skb, 0); 2896 skb_set_network_header(skb, 0); 2897 skb_set_transport_header(skb, 0); 2898 2899 skb_set_queue_mapping(skb, ac); 2900 skb->priority = tid; 2901 2902 skb->dev = sdata->dev; 2903 2904 /* 2905 * The other path calling ieee80211_xmit is from the tasklet, 2906 * and while we can handle concurrent transmissions locking 2907 * requirements are that we do not come into tx with bhs on. 2908 */ 2909 local_bh_disable(); 2910 ieee80211_xmit(sdata, skb, band); 2911 local_bh_enable(); 2912 } 2913