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