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; 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 50 /* assume HW handles this */ 51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) 52 return 0; 53 54 /* uh huh? */ 55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) 56 return 0; 57 58 sband = local->hw.wiphy->bands[info->band]; 59 txrate = &sband->bitrates[info->control.rates[0].idx]; 60 61 erp = txrate->flags & IEEE80211_RATE_ERP_G; 62 63 /* 64 * data and mgmt (except PS Poll): 65 * - during CFP: 32768 66 * - during contention period: 67 * if addr1 is group address: 0 68 * if more fragments = 0 and addr1 is individual address: time to 69 * transmit one ACK plus SIFS 70 * if more fragments = 1 and addr1 is individual address: time to 71 * transmit next fragment plus 2 x ACK plus 3 x SIFS 72 * 73 * IEEE 802.11, 9.6: 74 * - control response frame (CTS or ACK) shall be transmitted using the 75 * same rate as the immediately previous frame in the frame exchange 76 * sequence, if this rate belongs to the PHY mandatory rates, or else 77 * at the highest possible rate belonging to the PHY rates in the 78 * BSSBasicRateSet 79 */ 80 hdr = (struct ieee80211_hdr *)skb->data; 81 if (ieee80211_is_ctl(hdr->frame_control)) { 82 /* TODO: These control frames are not currently sent by 83 * mac80211, but should they be implemented, this function 84 * needs to be updated to support duration field calculation. 85 * 86 * RTS: time needed to transmit pending data/mgmt frame plus 87 * one CTS frame plus one ACK frame plus 3 x SIFS 88 * CTS: duration of immediately previous RTS minus time 89 * required to transmit CTS and its SIFS 90 * ACK: 0 if immediately previous directed data/mgmt had 91 * more=0, with more=1 duration in ACK frame is duration 92 * from previous frame minus time needed to transmit ACK 93 * and its SIFS 94 * PS Poll: BIT(15) | BIT(14) | aid 95 */ 96 return 0; 97 } 98 99 /* data/mgmt */ 100 if (0 /* FIX: data/mgmt during CFP */) 101 return cpu_to_le16(32768); 102 103 if (group_addr) /* Group address as the destination - no ACK */ 104 return 0; 105 106 /* Individual destination address: 107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 108 * CTS and ACK frames shall be transmitted using the highest rate in 109 * basic rate set that is less than or equal to the rate of the 110 * immediately previous frame and that is using the same modulation 111 * (CCK or OFDM). If no basic rate set matches with these requirements, 112 * the highest mandatory rate of the PHY that is less than or equal to 113 * the rate of the previous frame is used. 114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 115 */ 116 rate = -1; 117 /* use lowest available if everything fails */ 118 mrate = sband->bitrates[0].bitrate; 119 for (i = 0; i < sband->n_bitrates; i++) { 120 struct ieee80211_rate *r = &sband->bitrates[i]; 121 122 if (r->bitrate > txrate->bitrate) 123 break; 124 125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 126 rate = r->bitrate; 127 128 switch (sband->band) { 129 case IEEE80211_BAND_2GHZ: { 130 u32 flag; 131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 132 flag = IEEE80211_RATE_MANDATORY_G; 133 else 134 flag = IEEE80211_RATE_MANDATORY_B; 135 if (r->flags & flag) 136 mrate = r->bitrate; 137 break; 138 } 139 case IEEE80211_BAND_5GHZ: 140 if (r->flags & IEEE80211_RATE_MANDATORY_A) 141 mrate = r->bitrate; 142 break; 143 case IEEE80211_BAND_60GHZ: 144 /* TODO, for now fall through */ 145 case IEEE80211_NUM_BANDS: 146 WARN_ON(1); 147 break; 148 } 149 } 150 if (rate == -1) { 151 /* No matching basic rate found; use highest suitable mandatory 152 * PHY rate */ 153 rate = mrate; 154 } 155 156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 157 if (ieee80211_is_data_qos(hdr->frame_control) && 158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 159 dur = 0; 160 else 161 /* Time needed to transmit ACK 162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 163 * to closest integer */ 164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 165 tx->sdata->vif.bss_conf.use_short_preamble); 166 167 if (next_frag_len) { 168 /* Frame is fragmented: duration increases with time needed to 169 * transmit next fragment plus ACK and 2 x SIFS. */ 170 dur *= 2; /* ACK + SIFS */ 171 /* next fragment */ 172 dur += ieee80211_frame_duration(sband->band, next_frag_len, 173 txrate->bitrate, erp, 174 tx->sdata->vif.bss_conf.use_short_preamble); 175 } 176 177 return cpu_to_le16(dur); 178 } 179 180 /* tx handlers */ 181 static ieee80211_tx_result debug_noinline 182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 183 { 184 struct ieee80211_local *local = tx->local; 185 struct ieee80211_if_managed *ifmgd; 186 187 /* driver doesn't support power save */ 188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 189 return TX_CONTINUE; 190 191 /* hardware does dynamic power save */ 192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 193 return TX_CONTINUE; 194 195 /* dynamic power save disabled */ 196 if (local->hw.conf.dynamic_ps_timeout <= 0) 197 return TX_CONTINUE; 198 199 /* we are scanning, don't enable power save */ 200 if (local->scanning) 201 return TX_CONTINUE; 202 203 if (!local->ps_sdata) 204 return TX_CONTINUE; 205 206 /* No point if we're going to suspend */ 207 if (local->quiescing) 208 return TX_CONTINUE; 209 210 /* dynamic ps is supported only in managed mode */ 211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 212 return TX_CONTINUE; 213 214 ifmgd = &tx->sdata->u.mgd; 215 216 /* 217 * Don't wakeup from power save if u-apsd is enabled, voip ac has 218 * u-apsd enabled and the frame is in voip class. This effectively 219 * means that even if all access categories have u-apsd enabled, in 220 * practise u-apsd is only used with the voip ac. This is a 221 * workaround for the case when received voip class packets do not 222 * have correct qos tag for some reason, due the network or the 223 * peer application. 224 * 225 * Note: ifmgd->uapsd_queues access is racy here. If the value is 226 * changed via debugfs, user needs to reassociate manually to have 227 * everything in sync. 228 */ 229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 232 return TX_CONTINUE; 233 234 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 235 ieee80211_stop_queues_by_reason(&local->hw, 236 IEEE80211_QUEUE_STOP_REASON_PS); 237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 238 ieee80211_queue_work(&local->hw, 239 &local->dynamic_ps_disable_work); 240 } 241 242 /* Don't restart the timer if we're not disassociated */ 243 if (!ifmgd->associated) 244 return TX_CONTINUE; 245 246 mod_timer(&local->dynamic_ps_timer, jiffies + 247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 248 249 return TX_CONTINUE; 250 } 251 252 static ieee80211_tx_result debug_noinline 253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 254 { 255 256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 258 bool assoc = false; 259 260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 261 return TX_CONTINUE; 262 263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 265 !ieee80211_is_probe_req(hdr->frame_control) && 266 !ieee80211_is_nullfunc(hdr->frame_control)) 267 /* 268 * When software scanning only nullfunc frames (to notify 269 * the sleep state to the AP) and probe requests (for the 270 * active scan) are allowed, all other frames should not be 271 * sent and we should not get here, but if we do 272 * nonetheless, drop them to avoid sending them 273 * off-channel. See the link below and 274 * ieee80211_start_scan() for more. 275 * 276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 277 */ 278 return TX_DROP; 279 280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 281 return TX_CONTINUE; 282 283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 284 return TX_CONTINUE; 285 286 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 287 return TX_CONTINUE; 288 289 if (tx->sta) 290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 291 292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 293 if (unlikely(!assoc && 294 ieee80211_is_data(hdr->frame_control))) { 295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 296 sdata_info(tx->sdata, 297 "dropped data frame to not associated station %pM\n", 298 hdr->addr1); 299 #endif 300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 301 return TX_DROP; 302 } 303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 304 ieee80211_is_data(hdr->frame_control) && 305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 306 /* 307 * No associated STAs - no need to send multicast 308 * frames. 309 */ 310 return TX_DROP; 311 } 312 313 return TX_CONTINUE; 314 } 315 316 /* This function is called whenever the AP is about to exceed the maximum limit 317 * of buffered frames for power saving STAs. This situation should not really 318 * happen often during normal operation, so dropping the oldest buffered packet 319 * from each queue should be OK to make some room for new frames. */ 320 static void purge_old_ps_buffers(struct ieee80211_local *local) 321 { 322 int total = 0, purged = 0; 323 struct sk_buff *skb; 324 struct ieee80211_sub_if_data *sdata; 325 struct sta_info *sta; 326 327 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 328 struct ps_data *ps; 329 330 if (sdata->vif.type == NL80211_IFTYPE_AP) 331 ps = &sdata->u.ap.ps; 332 else if (ieee80211_vif_is_mesh(&sdata->vif)) 333 ps = &sdata->u.mesh.ps; 334 else 335 continue; 336 337 skb = skb_dequeue(&ps->bc_buf); 338 if (skb) { 339 purged++; 340 dev_kfree_skb(skb); 341 } 342 total += skb_queue_len(&ps->bc_buf); 343 } 344 345 /* 346 * Drop one frame from each station from the lowest-priority 347 * AC that has frames at all. 348 */ 349 list_for_each_entry_rcu(sta, &local->sta_list, list) { 350 int ac; 351 352 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 353 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 354 total += skb_queue_len(&sta->ps_tx_buf[ac]); 355 if (skb) { 356 purged++; 357 ieee80211_free_txskb(&local->hw, skb); 358 break; 359 } 360 } 361 } 362 363 local->total_ps_buffered = total; 364 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 365 } 366 367 static ieee80211_tx_result 368 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 369 { 370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 372 struct ps_data *ps; 373 374 /* 375 * broadcast/multicast frame 376 * 377 * If any of the associated/peer stations is in power save mode, 378 * the frame is buffered to be sent after DTIM beacon frame. 379 * This is done either by the hardware or us. 380 */ 381 382 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 383 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 384 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 385 if (!tx->sdata->bss) 386 return TX_CONTINUE; 387 388 ps = &tx->sdata->bss->ps; 389 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 390 ps = &tx->sdata->u.mesh.ps; 391 } else { 392 return TX_CONTINUE; 393 } 394 395 396 /* no buffering for ordered frames */ 397 if (ieee80211_has_order(hdr->frame_control)) 398 return TX_CONTINUE; 399 400 /* no stations in PS mode */ 401 if (!atomic_read(&ps->num_sta_ps)) 402 return TX_CONTINUE; 403 404 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 405 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 406 info->hw_queue = tx->sdata->vif.cab_queue; 407 408 /* device releases frame after DTIM beacon */ 409 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 410 return TX_CONTINUE; 411 412 /* buffered in mac80211 */ 413 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 414 purge_old_ps_buffers(tx->local); 415 416 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 417 ps_dbg(tx->sdata, 418 "BC TX buffer full - dropping the oldest frame\n"); 419 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 420 } else 421 tx->local->total_ps_buffered++; 422 423 skb_queue_tail(&ps->bc_buf, tx->skb); 424 425 return TX_QUEUED; 426 } 427 428 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 429 struct sk_buff *skb) 430 { 431 if (!ieee80211_is_mgmt(fc)) 432 return 0; 433 434 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 435 return 0; 436 437 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 438 skb->data)) 439 return 0; 440 441 return 1; 442 } 443 444 static ieee80211_tx_result 445 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 446 { 447 struct sta_info *sta = tx->sta; 448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 450 struct ieee80211_local *local = tx->local; 451 452 if (unlikely(!sta)) 453 return TX_CONTINUE; 454 455 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 456 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 457 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 458 int ac = skb_get_queue_mapping(tx->skb); 459 460 /* only deauth, disassoc and action are bufferable MMPDUs */ 461 if (ieee80211_is_mgmt(hdr->frame_control) && 462 !ieee80211_is_deauth(hdr->frame_control) && 463 !ieee80211_is_disassoc(hdr->frame_control) && 464 !ieee80211_is_action(hdr->frame_control)) { 465 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 466 return TX_CONTINUE; 467 } 468 469 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 470 sta->sta.addr, sta->sta.aid, ac); 471 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 472 purge_old_ps_buffers(tx->local); 473 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 474 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 475 ps_dbg(tx->sdata, 476 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 477 sta->sta.addr, ac); 478 ieee80211_free_txskb(&local->hw, old); 479 } else 480 tx->local->total_ps_buffered++; 481 482 info->control.jiffies = jiffies; 483 info->control.vif = &tx->sdata->vif; 484 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 485 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 486 487 if (!timer_pending(&local->sta_cleanup)) 488 mod_timer(&local->sta_cleanup, 489 round_jiffies(jiffies + 490 STA_INFO_CLEANUP_INTERVAL)); 491 492 /* 493 * We queued up some frames, so the TIM bit might 494 * need to be set, recalculate it. 495 */ 496 sta_info_recalc_tim(sta); 497 498 return TX_QUEUED; 499 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 500 ps_dbg(tx->sdata, 501 "STA %pM in PS mode, but polling/in SP -> send frame\n", 502 sta->sta.addr); 503 } 504 505 return TX_CONTINUE; 506 } 507 508 static ieee80211_tx_result debug_noinline 509 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 510 { 511 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 512 return TX_CONTINUE; 513 514 if (tx->flags & IEEE80211_TX_UNICAST) 515 return ieee80211_tx_h_unicast_ps_buf(tx); 516 else 517 return ieee80211_tx_h_multicast_ps_buf(tx); 518 } 519 520 static ieee80211_tx_result debug_noinline 521 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 522 { 523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 524 525 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 526 tx->sdata->control_port_no_encrypt)) 527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 528 529 return TX_CONTINUE; 530 } 531 532 static ieee80211_tx_result debug_noinline 533 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 534 { 535 struct ieee80211_key *key; 536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 538 539 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 540 tx->key = NULL; 541 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 542 tx->key = key; 543 else if (ieee80211_is_mgmt(hdr->frame_control) && 544 is_multicast_ether_addr(hdr->addr1) && 545 ieee80211_is_robust_mgmt_frame(hdr) && 546 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 547 tx->key = key; 548 else if (is_multicast_ether_addr(hdr->addr1) && 549 (key = rcu_dereference(tx->sdata->default_multicast_key))) 550 tx->key = key; 551 else if (!is_multicast_ether_addr(hdr->addr1) && 552 (key = rcu_dereference(tx->sdata->default_unicast_key))) 553 tx->key = key; 554 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 555 tx->key = NULL; 556 else if (!tx->sdata->drop_unencrypted) 557 tx->key = NULL; 558 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 559 tx->key = NULL; 560 else if (ieee80211_is_robust_mgmt_frame(hdr) && 561 !(ieee80211_is_action(hdr->frame_control) && 562 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 563 tx->key = NULL; 564 else if (ieee80211_is_mgmt(hdr->frame_control) && 565 !ieee80211_is_robust_mgmt_frame(hdr)) 566 tx->key = NULL; 567 else { 568 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 569 return TX_DROP; 570 } 571 572 if (tx->key) { 573 bool skip_hw = false; 574 575 tx->key->tx_rx_count++; 576 /* TODO: add threshold stuff again */ 577 578 switch (tx->key->conf.cipher) { 579 case WLAN_CIPHER_SUITE_WEP40: 580 case WLAN_CIPHER_SUITE_WEP104: 581 case WLAN_CIPHER_SUITE_TKIP: 582 if (!ieee80211_is_data_present(hdr->frame_control)) 583 tx->key = NULL; 584 break; 585 case WLAN_CIPHER_SUITE_CCMP: 586 if (!ieee80211_is_data_present(hdr->frame_control) && 587 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 588 tx->skb)) 589 tx->key = NULL; 590 else 591 skip_hw = (tx->key->conf.flags & 592 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 593 ieee80211_is_mgmt(hdr->frame_control); 594 break; 595 case WLAN_CIPHER_SUITE_AES_CMAC: 596 if (!ieee80211_is_mgmt(hdr->frame_control)) 597 tx->key = NULL; 598 break; 599 } 600 601 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 602 !ieee80211_is_deauth(hdr->frame_control))) 603 return TX_DROP; 604 605 if (!skip_hw && tx->key && 606 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 607 info->control.hw_key = &tx->key->conf; 608 } 609 610 return TX_CONTINUE; 611 } 612 613 static ieee80211_tx_result debug_noinline 614 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 615 { 616 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 617 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 618 struct ieee80211_supported_band *sband; 619 struct ieee80211_rate *rate; 620 int i; 621 u32 len; 622 bool inval = false, rts = false, short_preamble = false; 623 struct ieee80211_tx_rate_control txrc; 624 bool assoc = false; 625 626 memset(&txrc, 0, sizeof(txrc)); 627 628 sband = tx->local->hw.wiphy->bands[info->band]; 629 630 len = min_t(u32, tx->skb->len + FCS_LEN, 631 tx->local->hw.wiphy->frag_threshold); 632 633 /* set up the tx rate control struct we give the RC algo */ 634 txrc.hw = &tx->local->hw; 635 txrc.sband = sband; 636 txrc.bss_conf = &tx->sdata->vif.bss_conf; 637 txrc.skb = tx->skb; 638 txrc.reported_rate.idx = -1; 639 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 640 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 641 txrc.max_rate_idx = -1; 642 else 643 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 644 memcpy(txrc.rate_idx_mcs_mask, 645 tx->sdata->rc_rateidx_mcs_mask[info->band], 646 sizeof(txrc.rate_idx_mcs_mask)); 647 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 648 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 649 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 650 651 /* set up RTS protection if desired */ 652 if (len > tx->local->hw.wiphy->rts_threshold) { 653 txrc.rts = rts = true; 654 } 655 656 /* 657 * Use short preamble if the BSS can handle it, but not for 658 * management frames unless we know the receiver can handle 659 * that -- the management frame might be to a station that 660 * just wants a probe response. 661 */ 662 if (tx->sdata->vif.bss_conf.use_short_preamble && 663 (ieee80211_is_data(hdr->frame_control) || 664 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 665 txrc.short_preamble = short_preamble = true; 666 667 if (tx->sta) 668 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 669 670 /* 671 * Lets not bother rate control if we're associated and cannot 672 * talk to the sta. This should not happen. 673 */ 674 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 675 !rate_usable_index_exists(sband, &tx->sta->sta), 676 "%s: Dropped data frame as no usable bitrate found while " 677 "scanning and associated. Target station: " 678 "%pM on %d GHz band\n", 679 tx->sdata->name, hdr->addr1, 680 info->band ? 5 : 2)) 681 return TX_DROP; 682 683 /* 684 * If we're associated with the sta at this point we know we can at 685 * least send the frame at the lowest bit rate. 686 */ 687 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 688 689 if (unlikely(info->control.rates[0].idx < 0)) 690 return TX_DROP; 691 692 if (txrc.reported_rate.idx < 0) { 693 txrc.reported_rate = info->control.rates[0]; 694 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 695 tx->sta->last_tx_rate = txrc.reported_rate; 696 } else if (tx->sta) 697 tx->sta->last_tx_rate = txrc.reported_rate; 698 699 if (unlikely(!info->control.rates[0].count)) 700 info->control.rates[0].count = 1; 701 702 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 703 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 704 info->control.rates[0].count = 1; 705 706 if (is_multicast_ether_addr(hdr->addr1)) { 707 /* 708 * XXX: verify the rate is in the basic rateset 709 */ 710 return TX_CONTINUE; 711 } 712 713 /* 714 * set up the RTS/CTS rate as the fastest basic rate 715 * that is not faster than the data rate 716 * 717 * XXX: Should this check all retry rates? 718 */ 719 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 720 s8 baserate = 0; 721 722 rate = &sband->bitrates[info->control.rates[0].idx]; 723 724 for (i = 0; i < sband->n_bitrates; i++) { 725 /* must be a basic rate */ 726 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 727 continue; 728 /* must not be faster than the data rate */ 729 if (sband->bitrates[i].bitrate > rate->bitrate) 730 continue; 731 /* maximum */ 732 if (sband->bitrates[baserate].bitrate < 733 sband->bitrates[i].bitrate) 734 baserate = i; 735 } 736 737 info->control.rts_cts_rate_idx = baserate; 738 } 739 740 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 741 /* 742 * make sure there's no valid rate following 743 * an invalid one, just in case drivers don't 744 * take the API seriously to stop at -1. 745 */ 746 if (inval) { 747 info->control.rates[i].idx = -1; 748 continue; 749 } 750 if (info->control.rates[i].idx < 0) { 751 inval = true; 752 continue; 753 } 754 755 /* 756 * For now assume MCS is already set up correctly, this 757 * needs to be fixed. 758 */ 759 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 760 WARN_ON(info->control.rates[i].idx > 76); 761 continue; 762 } 763 764 /* set up RTS protection if desired */ 765 if (rts) 766 info->control.rates[i].flags |= 767 IEEE80211_TX_RC_USE_RTS_CTS; 768 769 /* RC is busted */ 770 if (WARN_ON_ONCE(info->control.rates[i].idx >= 771 sband->n_bitrates)) { 772 info->control.rates[i].idx = -1; 773 continue; 774 } 775 776 rate = &sband->bitrates[info->control.rates[i].idx]; 777 778 /* set up short preamble */ 779 if (short_preamble && 780 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 781 info->control.rates[i].flags |= 782 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 783 784 /* set up G protection */ 785 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 786 rate->flags & IEEE80211_RATE_ERP_G) 787 info->control.rates[i].flags |= 788 IEEE80211_TX_RC_USE_CTS_PROTECT; 789 } 790 791 return TX_CONTINUE; 792 } 793 794 static ieee80211_tx_result debug_noinline 795 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 796 { 797 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 798 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 799 u16 *seq; 800 u8 *qc; 801 int tid; 802 803 /* 804 * Packet injection may want to control the sequence 805 * number, if we have no matching interface then we 806 * neither assign one ourselves nor ask the driver to. 807 */ 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 809 return TX_CONTINUE; 810 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 812 return TX_CONTINUE; 813 814 if (ieee80211_hdrlen(hdr->frame_control) < 24) 815 return TX_CONTINUE; 816 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 818 return TX_CONTINUE; 819 820 /* 821 * Anything but QoS data that has a sequence number field 822 * (is long enough) gets a sequence number from the global 823 * counter. 824 */ 825 if (!ieee80211_is_data_qos(hdr->frame_control)) { 826 /* driver should assign sequence number */ 827 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 828 /* for pure STA mode without beacons, we can do it */ 829 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 830 tx->sdata->sequence_number += 0x10; 831 return TX_CONTINUE; 832 } 833 834 /* 835 * This should be true for injected/management frames only, for 836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 837 * above since they are not QoS-data frames. 838 */ 839 if (!tx->sta) 840 return TX_CONTINUE; 841 842 /* include per-STA, per-TID sequence counter */ 843 844 qc = ieee80211_get_qos_ctl(hdr); 845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 846 seq = &tx->sta->tid_seq[tid]; 847 848 hdr->seq_ctrl = cpu_to_le16(*seq); 849 850 /* Increase the sequence number. */ 851 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 852 853 return TX_CONTINUE; 854 } 855 856 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 857 struct sk_buff *skb, int hdrlen, 858 int frag_threshold) 859 { 860 struct ieee80211_local *local = tx->local; 861 struct ieee80211_tx_info *info; 862 struct sk_buff *tmp; 863 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 864 int pos = hdrlen + per_fragm; 865 int rem = skb->len - hdrlen - per_fragm; 866 867 if (WARN_ON(rem < 0)) 868 return -EINVAL; 869 870 /* first fragment was already added to queue by caller */ 871 872 while (rem) { 873 int fraglen = per_fragm; 874 875 if (fraglen > rem) 876 fraglen = rem; 877 rem -= fraglen; 878 tmp = dev_alloc_skb(local->tx_headroom + 879 frag_threshold + 880 IEEE80211_ENCRYPT_HEADROOM + 881 IEEE80211_ENCRYPT_TAILROOM); 882 if (!tmp) 883 return -ENOMEM; 884 885 __skb_queue_tail(&tx->skbs, tmp); 886 887 skb_reserve(tmp, local->tx_headroom + 888 IEEE80211_ENCRYPT_HEADROOM); 889 /* copy control information */ 890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 891 892 info = IEEE80211_SKB_CB(tmp); 893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 894 IEEE80211_TX_CTL_FIRST_FRAGMENT); 895 896 if (rem) 897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 898 899 skb_copy_queue_mapping(tmp, skb); 900 tmp->priority = skb->priority; 901 tmp->dev = skb->dev; 902 903 /* copy header and data */ 904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 906 907 pos += fraglen; 908 } 909 910 /* adjust first fragment's length */ 911 skb->len = hdrlen + per_fragm; 912 return 0; 913 } 914 915 static ieee80211_tx_result debug_noinline 916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 917 { 918 struct sk_buff *skb = tx->skb; 919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 920 struct ieee80211_hdr *hdr = (void *)skb->data; 921 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 922 int hdrlen; 923 int fragnum; 924 925 /* no matter what happens, tx->skb moves to tx->skbs */ 926 __skb_queue_tail(&tx->skbs, skb); 927 tx->skb = NULL; 928 929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 930 return TX_CONTINUE; 931 932 if (tx->local->ops->set_frag_threshold) 933 return TX_CONTINUE; 934 935 /* 936 * Warn when submitting a fragmented A-MPDU frame and drop it. 937 * This scenario is handled in ieee80211_tx_prepare but extra 938 * caution taken here as fragmented ampdu may cause Tx stop. 939 */ 940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 941 return TX_DROP; 942 943 hdrlen = ieee80211_hdrlen(hdr->frame_control); 944 945 /* internal error, why isn't DONTFRAG set? */ 946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 947 return TX_DROP; 948 949 /* 950 * Now fragment the frame. This will allocate all the fragments and 951 * chain them (using skb as the first fragment) to skb->next. 952 * During transmission, we will remove the successfully transmitted 953 * fragments from this list. When the low-level driver rejects one 954 * of the fragments then we will simply pretend to accept the skb 955 * but store it away as pending. 956 */ 957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 958 return TX_DROP; 959 960 /* update duration/seq/flags of fragments */ 961 fragnum = 0; 962 963 skb_queue_walk(&tx->skbs, skb) { 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 965 966 hdr = (void *)skb->data; 967 info = IEEE80211_SKB_CB(skb); 968 969 if (!skb_queue_is_last(&tx->skbs, skb)) { 970 hdr->frame_control |= morefrags; 971 /* 972 * No multi-rate retries for fragmented frames, that 973 * would completely throw off the NAV at other STAs. 974 */ 975 info->control.rates[1].idx = -1; 976 info->control.rates[2].idx = -1; 977 info->control.rates[3].idx = -1; 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 980 } else { 981 hdr->frame_control &= ~morefrags; 982 } 983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 984 fragnum++; 985 } 986 987 return TX_CONTINUE; 988 } 989 990 static ieee80211_tx_result debug_noinline 991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 992 { 993 struct sk_buff *skb; 994 995 if (!tx->sta) 996 return TX_CONTINUE; 997 998 tx->sta->tx_packets++; 999 skb_queue_walk(&tx->skbs, skb) { 1000 tx->sta->tx_fragments++; 1001 tx->sta->tx_bytes += skb->len; 1002 } 1003 1004 return TX_CONTINUE; 1005 } 1006 1007 static ieee80211_tx_result debug_noinline 1008 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1009 { 1010 if (!tx->key) 1011 return TX_CONTINUE; 1012 1013 switch (tx->key->conf.cipher) { 1014 case WLAN_CIPHER_SUITE_WEP40: 1015 case WLAN_CIPHER_SUITE_WEP104: 1016 return ieee80211_crypto_wep_encrypt(tx); 1017 case WLAN_CIPHER_SUITE_TKIP: 1018 return ieee80211_crypto_tkip_encrypt(tx); 1019 case WLAN_CIPHER_SUITE_CCMP: 1020 return ieee80211_crypto_ccmp_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_AES_CMAC: 1022 return ieee80211_crypto_aes_cmac_encrypt(tx); 1023 default: 1024 return ieee80211_crypto_hw_encrypt(tx); 1025 } 1026 1027 return TX_DROP; 1028 } 1029 1030 static ieee80211_tx_result debug_noinline 1031 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1032 { 1033 struct sk_buff *skb; 1034 struct ieee80211_hdr *hdr; 1035 int next_len; 1036 bool group_addr; 1037 1038 skb_queue_walk(&tx->skbs, skb) { 1039 hdr = (void *) skb->data; 1040 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1041 break; /* must not overwrite AID */ 1042 if (!skb_queue_is_last(&tx->skbs, skb)) { 1043 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1044 next_len = next->len; 1045 } else 1046 next_len = 0; 1047 group_addr = is_multicast_ether_addr(hdr->addr1); 1048 1049 hdr->duration_id = 1050 ieee80211_duration(tx, skb, group_addr, next_len); 1051 } 1052 1053 return TX_CONTINUE; 1054 } 1055 1056 /* actual transmit path */ 1057 1058 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1059 struct sk_buff *skb, 1060 struct ieee80211_tx_info *info, 1061 struct tid_ampdu_tx *tid_tx, 1062 int tid) 1063 { 1064 bool queued = false; 1065 bool reset_agg_timer = false; 1066 struct sk_buff *purge_skb = NULL; 1067 1068 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1069 info->flags |= IEEE80211_TX_CTL_AMPDU; 1070 reset_agg_timer = true; 1071 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1072 /* 1073 * nothing -- this aggregation session is being started 1074 * but that might still fail with the driver 1075 */ 1076 } else { 1077 spin_lock(&tx->sta->lock); 1078 /* 1079 * Need to re-check now, because we may get here 1080 * 1081 * 1) in the window during which the setup is actually 1082 * already done, but not marked yet because not all 1083 * packets are spliced over to the driver pending 1084 * queue yet -- if this happened we acquire the lock 1085 * either before or after the splice happens, but 1086 * need to recheck which of these cases happened. 1087 * 1088 * 2) during session teardown, if the OPERATIONAL bit 1089 * was cleared due to the teardown but the pointer 1090 * hasn't been assigned NULL yet (or we loaded it 1091 * before it was assigned) -- in this case it may 1092 * now be NULL which means we should just let the 1093 * packet pass through because splicing the frames 1094 * back is already done. 1095 */ 1096 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1097 1098 if (!tid_tx) { 1099 /* do nothing, let packet pass through */ 1100 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1101 info->flags |= IEEE80211_TX_CTL_AMPDU; 1102 reset_agg_timer = true; 1103 } else { 1104 queued = true; 1105 info->control.vif = &tx->sdata->vif; 1106 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1107 __skb_queue_tail(&tid_tx->pending, skb); 1108 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1109 purge_skb = __skb_dequeue(&tid_tx->pending); 1110 } 1111 spin_unlock(&tx->sta->lock); 1112 1113 if (purge_skb) 1114 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1115 } 1116 1117 /* reset session timer */ 1118 if (reset_agg_timer && tid_tx->timeout) 1119 tid_tx->last_tx = jiffies; 1120 1121 return queued; 1122 } 1123 1124 /* 1125 * initialises @tx 1126 */ 1127 static ieee80211_tx_result 1128 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1129 struct ieee80211_tx_data *tx, 1130 struct sk_buff *skb) 1131 { 1132 struct ieee80211_local *local = sdata->local; 1133 struct ieee80211_hdr *hdr; 1134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1135 int tid; 1136 u8 *qc; 1137 1138 memset(tx, 0, sizeof(*tx)); 1139 tx->skb = skb; 1140 tx->local = local; 1141 tx->sdata = sdata; 1142 __skb_queue_head_init(&tx->skbs); 1143 1144 /* 1145 * If this flag is set to true anywhere, and we get here, 1146 * we are doing the needed processing, so remove the flag 1147 * now. 1148 */ 1149 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1150 1151 hdr = (struct ieee80211_hdr *) skb->data; 1152 1153 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1154 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1155 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1156 return TX_DROP; 1157 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1158 tx->sdata->control_port_protocol == tx->skb->protocol) { 1159 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1160 } 1161 if (!tx->sta) 1162 tx->sta = sta_info_get(sdata, hdr->addr1); 1163 1164 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1165 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1166 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1167 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1168 struct tid_ampdu_tx *tid_tx; 1169 1170 qc = ieee80211_get_qos_ctl(hdr); 1171 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1172 1173 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1174 if (tid_tx) { 1175 bool queued; 1176 1177 queued = ieee80211_tx_prep_agg(tx, skb, info, 1178 tid_tx, tid); 1179 1180 if (unlikely(queued)) 1181 return TX_QUEUED; 1182 } 1183 } 1184 1185 if (is_multicast_ether_addr(hdr->addr1)) { 1186 tx->flags &= ~IEEE80211_TX_UNICAST; 1187 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1188 } else 1189 tx->flags |= IEEE80211_TX_UNICAST; 1190 1191 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1192 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1193 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1194 info->flags & IEEE80211_TX_CTL_AMPDU) 1195 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1196 } 1197 1198 if (!tx->sta) 1199 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1200 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1202 1203 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1204 1205 return TX_CONTINUE; 1206 } 1207 1208 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1209 struct ieee80211_vif *vif, 1210 struct ieee80211_sta *sta, 1211 struct sk_buff_head *skbs, 1212 bool txpending) 1213 { 1214 struct ieee80211_tx_control control; 1215 struct sk_buff *skb, *tmp; 1216 unsigned long flags; 1217 1218 skb_queue_walk_safe(skbs, skb, tmp) { 1219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1220 int q = info->hw_queue; 1221 1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1223 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1224 __skb_unlink(skb, skbs); 1225 ieee80211_free_txskb(&local->hw, skb); 1226 continue; 1227 } 1228 #endif 1229 1230 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1231 if (local->queue_stop_reasons[q] || 1232 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1233 if (unlikely(info->flags & 1234 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1235 if (local->queue_stop_reasons[q] & 1236 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1237 /* 1238 * Drop off-channel frames if queues 1239 * are stopped for any reason other 1240 * than off-channel operation. Never 1241 * queue them. 1242 */ 1243 spin_unlock_irqrestore( 1244 &local->queue_stop_reason_lock, 1245 flags); 1246 ieee80211_purge_tx_queue(&local->hw, 1247 skbs); 1248 return true; 1249 } 1250 } else { 1251 1252 /* 1253 * Since queue is stopped, queue up frames for 1254 * later transmission from the tx-pending 1255 * tasklet when the queue is woken again. 1256 */ 1257 if (txpending) 1258 skb_queue_splice_init(skbs, 1259 &local->pending[q]); 1260 else 1261 skb_queue_splice_tail_init(skbs, 1262 &local->pending[q]); 1263 1264 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1265 flags); 1266 return false; 1267 } 1268 } 1269 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1270 1271 info->control.vif = vif; 1272 control.sta = sta; 1273 1274 __skb_unlink(skb, skbs); 1275 drv_tx(local, &control, skb); 1276 } 1277 1278 return true; 1279 } 1280 1281 /* 1282 * Returns false if the frame couldn't be transmitted but was queued instead. 1283 */ 1284 static bool __ieee80211_tx(struct ieee80211_local *local, 1285 struct sk_buff_head *skbs, int led_len, 1286 struct sta_info *sta, bool txpending) 1287 { 1288 struct ieee80211_tx_info *info; 1289 struct ieee80211_sub_if_data *sdata; 1290 struct ieee80211_vif *vif; 1291 struct ieee80211_sta *pubsta; 1292 struct sk_buff *skb; 1293 bool result = true; 1294 __le16 fc; 1295 1296 if (WARN_ON(skb_queue_empty(skbs))) 1297 return true; 1298 1299 skb = skb_peek(skbs); 1300 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1301 info = IEEE80211_SKB_CB(skb); 1302 sdata = vif_to_sdata(info->control.vif); 1303 if (sta && !sta->uploaded) 1304 sta = NULL; 1305 1306 if (sta) 1307 pubsta = &sta->sta; 1308 else 1309 pubsta = NULL; 1310 1311 switch (sdata->vif.type) { 1312 case NL80211_IFTYPE_MONITOR: 1313 sdata = rcu_dereference(local->monitor_sdata); 1314 if (sdata) { 1315 vif = &sdata->vif; 1316 info->hw_queue = 1317 vif->hw_queue[skb_get_queue_mapping(skb)]; 1318 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1319 dev_kfree_skb(skb); 1320 return true; 1321 } else 1322 vif = NULL; 1323 break; 1324 case NL80211_IFTYPE_AP_VLAN: 1325 sdata = container_of(sdata->bss, 1326 struct ieee80211_sub_if_data, u.ap); 1327 /* fall through */ 1328 default: 1329 vif = &sdata->vif; 1330 break; 1331 } 1332 1333 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1334 txpending); 1335 1336 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1337 ieee80211_led_tx(local, 1); 1338 1339 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1340 1341 return result; 1342 } 1343 1344 /* 1345 * Invoke TX handlers, return 0 on success and non-zero if the 1346 * frame was dropped or queued. 1347 */ 1348 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1349 { 1350 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1351 ieee80211_tx_result res = TX_DROP; 1352 1353 #define CALL_TXH(txh) \ 1354 do { \ 1355 res = txh(tx); \ 1356 if (res != TX_CONTINUE) \ 1357 goto txh_done; \ 1358 } while (0) 1359 1360 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1361 CALL_TXH(ieee80211_tx_h_check_assoc); 1362 CALL_TXH(ieee80211_tx_h_ps_buf); 1363 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1364 CALL_TXH(ieee80211_tx_h_select_key); 1365 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1366 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1367 1368 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1369 __skb_queue_tail(&tx->skbs, tx->skb); 1370 tx->skb = NULL; 1371 goto txh_done; 1372 } 1373 1374 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1375 CALL_TXH(ieee80211_tx_h_sequence); 1376 CALL_TXH(ieee80211_tx_h_fragment); 1377 /* handlers after fragment must be aware of tx info fragmentation! */ 1378 CALL_TXH(ieee80211_tx_h_stats); 1379 CALL_TXH(ieee80211_tx_h_encrypt); 1380 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1381 CALL_TXH(ieee80211_tx_h_calculate_duration); 1382 #undef CALL_TXH 1383 1384 txh_done: 1385 if (unlikely(res == TX_DROP)) { 1386 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1387 if (tx->skb) 1388 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1389 else 1390 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1391 return -1; 1392 } else if (unlikely(res == TX_QUEUED)) { 1393 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1394 return -1; 1395 } 1396 1397 return 0; 1398 } 1399 1400 /* 1401 * Returns false if the frame couldn't be transmitted but was queued instead. 1402 */ 1403 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1404 struct sk_buff *skb, bool txpending, 1405 enum ieee80211_band band) 1406 { 1407 struct ieee80211_local *local = sdata->local; 1408 struct ieee80211_tx_data tx; 1409 ieee80211_tx_result res_prepare; 1410 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1411 bool result = true; 1412 int led_len; 1413 1414 if (unlikely(skb->len < 10)) { 1415 dev_kfree_skb(skb); 1416 return true; 1417 } 1418 1419 /* initialises tx */ 1420 led_len = skb->len; 1421 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1422 1423 if (unlikely(res_prepare == TX_DROP)) { 1424 ieee80211_free_txskb(&local->hw, skb); 1425 return true; 1426 } else if (unlikely(res_prepare == TX_QUEUED)) { 1427 return true; 1428 } 1429 1430 info->band = band; 1431 1432 /* set up hw_queue value early */ 1433 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1434 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1435 info->hw_queue = 1436 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1437 1438 if (!invoke_tx_handlers(&tx)) 1439 result = __ieee80211_tx(local, &tx.skbs, led_len, 1440 tx.sta, txpending); 1441 1442 return result; 1443 } 1444 1445 /* device xmit handlers */ 1446 1447 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1448 struct sk_buff *skb, 1449 int head_need, bool may_encrypt) 1450 { 1451 struct ieee80211_local *local = sdata->local; 1452 int tail_need = 0; 1453 1454 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1455 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1456 tail_need -= skb_tailroom(skb); 1457 tail_need = max_t(int, tail_need, 0); 1458 } 1459 1460 if (skb_cloned(skb)) 1461 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1462 else if (head_need || tail_need) 1463 I802_DEBUG_INC(local->tx_expand_skb_head); 1464 else 1465 return 0; 1466 1467 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1468 wiphy_debug(local->hw.wiphy, 1469 "failed to reallocate TX buffer\n"); 1470 return -ENOMEM; 1471 } 1472 1473 return 0; 1474 } 1475 1476 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1477 enum ieee80211_band band) 1478 { 1479 struct ieee80211_local *local = sdata->local; 1480 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1481 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1482 int headroom; 1483 bool may_encrypt; 1484 1485 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1486 1487 headroom = local->tx_headroom; 1488 if (may_encrypt) 1489 headroom += IEEE80211_ENCRYPT_HEADROOM; 1490 headroom -= skb_headroom(skb); 1491 headroom = max_t(int, 0, headroom); 1492 1493 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1494 ieee80211_free_txskb(&local->hw, skb); 1495 return; 1496 } 1497 1498 hdr = (struct ieee80211_hdr *) skb->data; 1499 info->control.vif = &sdata->vif; 1500 1501 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1502 if (ieee80211_is_data(hdr->frame_control) && 1503 is_unicast_ether_addr(hdr->addr1)) { 1504 if (mesh_nexthop_resolve(sdata, skb)) 1505 return; /* skb queued: don't free */ 1506 } else { 1507 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1508 } 1509 } 1510 1511 ieee80211_set_qos_hdr(sdata, skb); 1512 ieee80211_tx(sdata, skb, false, band); 1513 } 1514 1515 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1516 { 1517 struct ieee80211_radiotap_iterator iterator; 1518 struct ieee80211_radiotap_header *rthdr = 1519 (struct ieee80211_radiotap_header *) skb->data; 1520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1521 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1522 NULL); 1523 u16 txflags; 1524 1525 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1526 IEEE80211_TX_CTL_DONTFRAG; 1527 1528 /* 1529 * for every radiotap entry that is present 1530 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1531 * entries present, or -EINVAL on error) 1532 */ 1533 1534 while (!ret) { 1535 ret = ieee80211_radiotap_iterator_next(&iterator); 1536 1537 if (ret) 1538 continue; 1539 1540 /* see if this argument is something we can use */ 1541 switch (iterator.this_arg_index) { 1542 /* 1543 * You must take care when dereferencing iterator.this_arg 1544 * for multibyte types... the pointer is not aligned. Use 1545 * get_unaligned((type *)iterator.this_arg) to dereference 1546 * iterator.this_arg for type "type" safely on all arches. 1547 */ 1548 case IEEE80211_RADIOTAP_FLAGS: 1549 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1550 /* 1551 * this indicates that the skb we have been 1552 * handed has the 32-bit FCS CRC at the end... 1553 * we should react to that by snipping it off 1554 * because it will be recomputed and added 1555 * on transmission 1556 */ 1557 if (skb->len < (iterator._max_length + FCS_LEN)) 1558 return false; 1559 1560 skb_trim(skb, skb->len - FCS_LEN); 1561 } 1562 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1563 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1564 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1565 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1566 break; 1567 1568 case IEEE80211_RADIOTAP_TX_FLAGS: 1569 txflags = get_unaligned_le16(iterator.this_arg); 1570 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1571 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1572 break; 1573 1574 /* 1575 * Please update the file 1576 * Documentation/networking/mac80211-injection.txt 1577 * when parsing new fields here. 1578 */ 1579 1580 default: 1581 break; 1582 } 1583 } 1584 1585 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1586 return false; 1587 1588 /* 1589 * remove the radiotap header 1590 * iterator->_max_length was sanity-checked against 1591 * skb->len by iterator init 1592 */ 1593 skb_pull(skb, iterator._max_length); 1594 1595 return true; 1596 } 1597 1598 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1599 struct net_device *dev) 1600 { 1601 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1602 struct ieee80211_chanctx_conf *chanctx_conf; 1603 struct ieee80211_channel *chan; 1604 struct ieee80211_radiotap_header *prthdr = 1605 (struct ieee80211_radiotap_header *)skb->data; 1606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1607 struct ieee80211_hdr *hdr; 1608 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1609 u16 len_rthdr; 1610 int hdrlen; 1611 1612 /* check for not even having the fixed radiotap header part */ 1613 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1614 goto fail; /* too short to be possibly valid */ 1615 1616 /* is it a header version we can trust to find length from? */ 1617 if (unlikely(prthdr->it_version)) 1618 goto fail; /* only version 0 is supported */ 1619 1620 /* then there must be a radiotap header with a length we can use */ 1621 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1622 1623 /* does the skb contain enough to deliver on the alleged length? */ 1624 if (unlikely(skb->len < len_rthdr)) 1625 goto fail; /* skb too short for claimed rt header extent */ 1626 1627 /* 1628 * fix up the pointers accounting for the radiotap 1629 * header still being in there. We are being given 1630 * a precooked IEEE80211 header so no need for 1631 * normal processing 1632 */ 1633 skb_set_mac_header(skb, len_rthdr); 1634 /* 1635 * these are just fixed to the end of the rt area since we 1636 * don't have any better information and at this point, nobody cares 1637 */ 1638 skb_set_network_header(skb, len_rthdr); 1639 skb_set_transport_header(skb, len_rthdr); 1640 1641 if (skb->len < len_rthdr + 2) 1642 goto fail; 1643 1644 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1645 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1646 1647 if (skb->len < len_rthdr + hdrlen) 1648 goto fail; 1649 1650 /* 1651 * Initialize skb->protocol if the injected frame is a data frame 1652 * carrying a rfc1042 header 1653 */ 1654 if (ieee80211_is_data(hdr->frame_control) && 1655 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1656 u8 *payload = (u8 *)hdr + hdrlen; 1657 1658 if (ether_addr_equal(payload, rfc1042_header)) 1659 skb->protocol = cpu_to_be16((payload[6] << 8) | 1660 payload[7]); 1661 } 1662 1663 memset(info, 0, sizeof(*info)); 1664 1665 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1666 IEEE80211_TX_CTL_INJECTED; 1667 1668 /* process and remove the injection radiotap header */ 1669 if (!ieee80211_parse_tx_radiotap(skb)) 1670 goto fail; 1671 1672 rcu_read_lock(); 1673 1674 /* 1675 * We process outgoing injected frames that have a local address 1676 * we handle as though they are non-injected frames. 1677 * This code here isn't entirely correct, the local MAC address 1678 * isn't always enough to find the interface to use; for proper 1679 * VLAN/WDS support we will need a different mechanism (which 1680 * likely isn't going to be monitor interfaces). 1681 */ 1682 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1683 1684 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1685 if (!ieee80211_sdata_running(tmp_sdata)) 1686 continue; 1687 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1688 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1689 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1690 continue; 1691 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1692 sdata = tmp_sdata; 1693 break; 1694 } 1695 } 1696 1697 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1698 if (!chanctx_conf) { 1699 tmp_sdata = rcu_dereference(local->monitor_sdata); 1700 if (tmp_sdata) 1701 chanctx_conf = 1702 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1703 } 1704 1705 if (chanctx_conf) 1706 chan = chanctx_conf->def.chan; 1707 else if (!local->use_chanctx) 1708 chan = local->_oper_channel; 1709 else 1710 goto fail_rcu; 1711 1712 /* 1713 * Frame injection is not allowed if beaconing is not allowed 1714 * or if we need radar detection. Beaconing is usually not allowed when 1715 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1716 * Passive scan is also used in world regulatory domains where 1717 * your country is not known and as such it should be treated as 1718 * NO TX unless the channel is explicitly allowed in which case 1719 * your current regulatory domain would not have the passive scan 1720 * flag. 1721 * 1722 * Since AP mode uses monitor interfaces to inject/TX management 1723 * frames we can make AP mode the exception to this rule once it 1724 * supports radar detection as its implementation can deal with 1725 * radar detection by itself. We can do that later by adding a 1726 * monitor flag interfaces used for AP support. 1727 */ 1728 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1729 IEEE80211_CHAN_PASSIVE_SCAN))) 1730 goto fail_rcu; 1731 1732 ieee80211_xmit(sdata, skb, chan->band); 1733 rcu_read_unlock(); 1734 1735 return NETDEV_TX_OK; 1736 1737 fail_rcu: 1738 rcu_read_unlock(); 1739 fail: 1740 dev_kfree_skb(skb); 1741 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1742 } 1743 1744 /** 1745 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1746 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1747 * @skb: packet to be sent 1748 * @dev: incoming interface 1749 * 1750 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1751 * not be freed, and caller is responsible for either retrying later or freeing 1752 * skb). 1753 * 1754 * This function takes in an Ethernet header and encapsulates it with suitable 1755 * IEEE 802.11 header based on which interface the packet is coming in. The 1756 * encapsulated packet will then be passed to master interface, wlan#.11, for 1757 * transmission (through low-level driver). 1758 */ 1759 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1760 struct net_device *dev) 1761 { 1762 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1763 struct ieee80211_local *local = sdata->local; 1764 struct ieee80211_tx_info *info; 1765 int head_need; 1766 u16 ethertype, hdrlen, meshhdrlen = 0; 1767 __le16 fc; 1768 struct ieee80211_hdr hdr; 1769 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1770 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1771 const u8 *encaps_data; 1772 int encaps_len, skip_header_bytes; 1773 int nh_pos, h_pos; 1774 struct sta_info *sta = NULL; 1775 bool wme_sta = false, authorized = false, tdls_auth = false; 1776 bool tdls_direct = false; 1777 bool multicast; 1778 u32 info_flags = 0; 1779 u16 info_id = 0; 1780 struct ieee80211_chanctx_conf *chanctx_conf; 1781 struct ieee80211_sub_if_data *ap_sdata; 1782 enum ieee80211_band band; 1783 1784 if (unlikely(skb->len < ETH_HLEN)) 1785 goto fail; 1786 1787 /* convert Ethernet header to proper 802.11 header (based on 1788 * operation mode) */ 1789 ethertype = (skb->data[12] << 8) | skb->data[13]; 1790 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1791 1792 rcu_read_lock(); 1793 1794 switch (sdata->vif.type) { 1795 case NL80211_IFTYPE_AP_VLAN: 1796 sta = rcu_dereference(sdata->u.vlan.sta); 1797 if (sta) { 1798 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1799 /* RA TA DA SA */ 1800 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1801 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1802 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1803 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1804 hdrlen = 30; 1805 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1806 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1807 } 1808 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1809 u.ap); 1810 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1811 if (!chanctx_conf) 1812 goto fail_rcu; 1813 band = chanctx_conf->def.chan->band; 1814 if (sta) 1815 break; 1816 /* fall through */ 1817 case NL80211_IFTYPE_AP: 1818 if (sdata->vif.type == NL80211_IFTYPE_AP) 1819 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1820 if (!chanctx_conf) 1821 goto fail_rcu; 1822 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1823 /* DA BSSID SA */ 1824 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1825 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1826 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1827 hdrlen = 24; 1828 band = chanctx_conf->def.chan->band; 1829 break; 1830 case NL80211_IFTYPE_WDS: 1831 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1832 /* RA TA DA SA */ 1833 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1834 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1835 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1836 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1837 hdrlen = 30; 1838 /* 1839 * This is the exception! WDS style interfaces are prohibited 1840 * when channel contexts are in used so this must be valid 1841 */ 1842 band = local->hw.conf.channel->band; 1843 break; 1844 #ifdef CONFIG_MAC80211_MESH 1845 case NL80211_IFTYPE_MESH_POINT: 1846 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1847 /* Do not send frames with mesh_ttl == 0 */ 1848 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1849 goto fail_rcu; 1850 } 1851 1852 if (!is_multicast_ether_addr(skb->data)) { 1853 struct sta_info *next_hop; 1854 bool mpp_lookup = true; 1855 1856 mpath = mesh_path_lookup(sdata, skb->data); 1857 if (mpath) { 1858 mpp_lookup = false; 1859 next_hop = rcu_dereference(mpath->next_hop); 1860 if (!next_hop || 1861 !(mpath->flags & (MESH_PATH_ACTIVE | 1862 MESH_PATH_RESOLVING))) 1863 mpp_lookup = true; 1864 } 1865 1866 if (mpp_lookup) 1867 mppath = mpp_path_lookup(sdata, skb->data); 1868 1869 if (mppath && mpath) 1870 mesh_path_del(mpath->sdata, mpath->dst); 1871 } 1872 1873 /* 1874 * Use address extension if it is a packet from 1875 * another interface or if we know the destination 1876 * is being proxied by a portal (i.e. portal address 1877 * differs from proxied address) 1878 */ 1879 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1880 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1881 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1882 skb->data, skb->data + ETH_ALEN); 1883 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1884 NULL, NULL); 1885 } else { 1886 /* DS -> MBSS (802.11-2012 13.11.3.3). 1887 * For unicast with unknown forwarding information, 1888 * destination might be in the MBSS or if that fails 1889 * forwarded to another mesh gate. In either case 1890 * resolution will be handled in ieee80211_xmit(), so 1891 * leave the original DA. This also works for mcast */ 1892 const u8 *mesh_da = skb->data; 1893 1894 if (mppath) 1895 mesh_da = mppath->mpp; 1896 else if (mpath) 1897 mesh_da = mpath->dst; 1898 1899 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1900 mesh_da, sdata->vif.addr); 1901 if (is_multicast_ether_addr(mesh_da)) 1902 /* DA TA mSA AE:SA */ 1903 meshhdrlen = ieee80211_new_mesh_header( 1904 sdata, &mesh_hdr, 1905 skb->data + ETH_ALEN, NULL); 1906 else 1907 /* RA TA mDA mSA AE:DA SA */ 1908 meshhdrlen = ieee80211_new_mesh_header( 1909 sdata, &mesh_hdr, skb->data, 1910 skb->data + ETH_ALEN); 1911 1912 } 1913 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1914 if (!chanctx_conf) 1915 goto fail_rcu; 1916 band = chanctx_conf->def.chan->band; 1917 break; 1918 #endif 1919 case NL80211_IFTYPE_STATION: 1920 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1921 bool tdls_peer = false; 1922 1923 sta = sta_info_get(sdata, skb->data); 1924 if (sta) { 1925 authorized = test_sta_flag(sta, 1926 WLAN_STA_AUTHORIZED); 1927 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1928 tdls_peer = test_sta_flag(sta, 1929 WLAN_STA_TDLS_PEER); 1930 tdls_auth = test_sta_flag(sta, 1931 WLAN_STA_TDLS_PEER_AUTH); 1932 } 1933 1934 /* 1935 * If the TDLS link is enabled, send everything 1936 * directly. Otherwise, allow TDLS setup frames 1937 * to be transmitted indirectly. 1938 */ 1939 tdls_direct = tdls_peer && (tdls_auth || 1940 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1941 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1942 } 1943 1944 if (tdls_direct) { 1945 /* link during setup - throw out frames to peer */ 1946 if (!tdls_auth) 1947 goto fail_rcu; 1948 1949 /* DA SA BSSID */ 1950 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1951 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1952 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1953 hdrlen = 24; 1954 } else if (sdata->u.mgd.use_4addr && 1955 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1956 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1957 IEEE80211_FCTL_TODS); 1958 /* RA TA DA SA */ 1959 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1960 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1961 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1962 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1963 hdrlen = 30; 1964 } else { 1965 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1966 /* BSSID SA DA */ 1967 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1968 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1969 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1970 hdrlen = 24; 1971 } 1972 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1973 if (!chanctx_conf) 1974 goto fail_rcu; 1975 band = chanctx_conf->def.chan->band; 1976 break; 1977 case NL80211_IFTYPE_ADHOC: 1978 /* DA SA BSSID */ 1979 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1980 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1981 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1982 hdrlen = 24; 1983 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1984 if (!chanctx_conf) 1985 goto fail_rcu; 1986 band = chanctx_conf->def.chan->band; 1987 break; 1988 default: 1989 goto fail_rcu; 1990 } 1991 1992 /* 1993 * There's no need to try to look up the destination 1994 * if it is a multicast address (which can only happen 1995 * in AP mode) 1996 */ 1997 multicast = is_multicast_ether_addr(hdr.addr1); 1998 if (!multicast) { 1999 sta = sta_info_get(sdata, hdr.addr1); 2000 if (sta) { 2001 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2002 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 2003 } 2004 } 2005 2006 /* For mesh, the use of the QoS header is mandatory */ 2007 if (ieee80211_vif_is_mesh(&sdata->vif)) 2008 wme_sta = true; 2009 2010 /* receiver and we are QoS enabled, use a QoS type frame */ 2011 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 2012 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2013 hdrlen += 2; 2014 } 2015 2016 /* 2017 * Drop unicast frames to unauthorised stations unless they are 2018 * EAPOL frames from the local station. 2019 */ 2020 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2021 !is_multicast_ether_addr(hdr.addr1) && !authorized && 2022 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2023 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2024 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2025 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2026 dev->name, hdr.addr1); 2027 #endif 2028 2029 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2030 2031 goto fail_rcu; 2032 } 2033 2034 if (unlikely(!multicast && skb->sk && 2035 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2036 struct sk_buff *orig_skb = skb; 2037 2038 skb = skb_clone(skb, GFP_ATOMIC); 2039 if (skb) { 2040 unsigned long flags; 2041 int id; 2042 2043 spin_lock_irqsave(&local->ack_status_lock, flags); 2044 id = idr_alloc(&local->ack_status_frames, orig_skb, 2045 1, 0x10000, GFP_ATOMIC); 2046 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2047 2048 if (id >= 0) { 2049 info_id = id; 2050 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2051 } else if (skb_shared(skb)) { 2052 kfree_skb(orig_skb); 2053 } else { 2054 kfree_skb(skb); 2055 skb = orig_skb; 2056 } 2057 } else { 2058 /* couldn't clone -- lose tx status ... */ 2059 skb = orig_skb; 2060 } 2061 } 2062 2063 /* 2064 * If the skb is shared we need to obtain our own copy. 2065 */ 2066 if (skb_shared(skb)) { 2067 struct sk_buff *tmp_skb = skb; 2068 2069 /* can't happen -- skb is a clone if info_id != 0 */ 2070 WARN_ON(info_id); 2071 2072 skb = skb_clone(skb, GFP_ATOMIC); 2073 kfree_skb(tmp_skb); 2074 2075 if (!skb) 2076 goto fail_rcu; 2077 } 2078 2079 hdr.frame_control = fc; 2080 hdr.duration_id = 0; 2081 hdr.seq_ctrl = 0; 2082 2083 skip_header_bytes = ETH_HLEN; 2084 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2085 encaps_data = bridge_tunnel_header; 2086 encaps_len = sizeof(bridge_tunnel_header); 2087 skip_header_bytes -= 2; 2088 } else if (ethertype >= 0x600) { 2089 encaps_data = rfc1042_header; 2090 encaps_len = sizeof(rfc1042_header); 2091 skip_header_bytes -= 2; 2092 } else { 2093 encaps_data = NULL; 2094 encaps_len = 0; 2095 } 2096 2097 nh_pos = skb_network_header(skb) - skb->data; 2098 h_pos = skb_transport_header(skb) - skb->data; 2099 2100 skb_pull(skb, skip_header_bytes); 2101 nh_pos -= skip_header_bytes; 2102 h_pos -= skip_header_bytes; 2103 2104 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2105 2106 /* 2107 * So we need to modify the skb header and hence need a copy of 2108 * that. The head_need variable above doesn't, so far, include 2109 * the needed header space that we don't need right away. If we 2110 * can, then we don't reallocate right now but only after the 2111 * frame arrives at the master device (if it does...) 2112 * 2113 * If we cannot, however, then we will reallocate to include all 2114 * the ever needed space. Also, if we need to reallocate it anyway, 2115 * make it big enough for everything we may ever need. 2116 */ 2117 2118 if (head_need > 0 || skb_cloned(skb)) { 2119 head_need += IEEE80211_ENCRYPT_HEADROOM; 2120 head_need += local->tx_headroom; 2121 head_need = max_t(int, 0, head_need); 2122 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2123 ieee80211_free_txskb(&local->hw, skb); 2124 skb = NULL; 2125 goto fail_rcu; 2126 } 2127 } 2128 2129 if (encaps_data) { 2130 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2131 nh_pos += encaps_len; 2132 h_pos += encaps_len; 2133 } 2134 2135 #ifdef CONFIG_MAC80211_MESH 2136 if (meshhdrlen > 0) { 2137 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2138 nh_pos += meshhdrlen; 2139 h_pos += meshhdrlen; 2140 } 2141 #endif 2142 2143 if (ieee80211_is_data_qos(fc)) { 2144 __le16 *qos_control; 2145 2146 qos_control = (__le16*) skb_push(skb, 2); 2147 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2148 /* 2149 * Maybe we could actually set some fields here, for now just 2150 * initialise to zero to indicate no special operation. 2151 */ 2152 *qos_control = 0; 2153 } else 2154 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2155 2156 nh_pos += hdrlen; 2157 h_pos += hdrlen; 2158 2159 dev->stats.tx_packets++; 2160 dev->stats.tx_bytes += skb->len; 2161 2162 /* Update skb pointers to various headers since this modified frame 2163 * is going to go through Linux networking code that may potentially 2164 * need things like pointer to IP header. */ 2165 skb_set_mac_header(skb, 0); 2166 skb_set_network_header(skb, nh_pos); 2167 skb_set_transport_header(skb, h_pos); 2168 2169 info = IEEE80211_SKB_CB(skb); 2170 memset(info, 0, sizeof(*info)); 2171 2172 dev->trans_start = jiffies; 2173 2174 info->flags = info_flags; 2175 info->ack_frame_id = info_id; 2176 2177 ieee80211_xmit(sdata, skb, band); 2178 rcu_read_unlock(); 2179 2180 return NETDEV_TX_OK; 2181 2182 fail_rcu: 2183 rcu_read_unlock(); 2184 fail: 2185 dev_kfree_skb(skb); 2186 return NETDEV_TX_OK; 2187 } 2188 2189 2190 /* 2191 * ieee80211_clear_tx_pending may not be called in a context where 2192 * it is possible that it packets could come in again. 2193 */ 2194 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2195 { 2196 struct sk_buff *skb; 2197 int i; 2198 2199 for (i = 0; i < local->hw.queues; i++) { 2200 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2201 ieee80211_free_txskb(&local->hw, skb); 2202 } 2203 } 2204 2205 /* 2206 * Returns false if the frame couldn't be transmitted but was queued instead, 2207 * which in this case means re-queued -- take as an indication to stop sending 2208 * more pending frames. 2209 */ 2210 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2211 struct sk_buff *skb) 2212 { 2213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2214 struct ieee80211_sub_if_data *sdata; 2215 struct sta_info *sta; 2216 struct ieee80211_hdr *hdr; 2217 bool result; 2218 struct ieee80211_chanctx_conf *chanctx_conf; 2219 2220 sdata = vif_to_sdata(info->control.vif); 2221 2222 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2223 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2224 if (unlikely(!chanctx_conf)) { 2225 dev_kfree_skb(skb); 2226 return true; 2227 } 2228 result = ieee80211_tx(sdata, skb, true, 2229 chanctx_conf->def.chan->band); 2230 } else { 2231 struct sk_buff_head skbs; 2232 2233 __skb_queue_head_init(&skbs); 2234 __skb_queue_tail(&skbs, skb); 2235 2236 hdr = (struct ieee80211_hdr *)skb->data; 2237 sta = sta_info_get(sdata, hdr->addr1); 2238 2239 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2240 } 2241 2242 return result; 2243 } 2244 2245 /* 2246 * Transmit all pending packets. Called from tasklet. 2247 */ 2248 void ieee80211_tx_pending(unsigned long data) 2249 { 2250 struct ieee80211_local *local = (struct ieee80211_local *)data; 2251 unsigned long flags; 2252 int i; 2253 bool txok; 2254 2255 rcu_read_lock(); 2256 2257 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2258 for (i = 0; i < local->hw.queues; i++) { 2259 /* 2260 * If queue is stopped by something other than due to pending 2261 * frames, or we have no pending frames, proceed to next queue. 2262 */ 2263 if (local->queue_stop_reasons[i] || 2264 skb_queue_empty(&local->pending[i])) 2265 continue; 2266 2267 while (!skb_queue_empty(&local->pending[i])) { 2268 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2269 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2270 2271 if (WARN_ON(!info->control.vif)) { 2272 ieee80211_free_txskb(&local->hw, skb); 2273 continue; 2274 } 2275 2276 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2277 flags); 2278 2279 txok = ieee80211_tx_pending_skb(local, skb); 2280 spin_lock_irqsave(&local->queue_stop_reason_lock, 2281 flags); 2282 if (!txok) 2283 break; 2284 } 2285 2286 if (skb_queue_empty(&local->pending[i])) 2287 ieee80211_propagate_queue_wake(local, i); 2288 } 2289 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2290 2291 rcu_read_unlock(); 2292 } 2293 2294 /* functions for drivers to get certain frames */ 2295 2296 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2297 struct ps_data *ps, struct sk_buff *skb) 2298 { 2299 u8 *pos, *tim; 2300 int aid0 = 0; 2301 int i, have_bits = 0, n1, n2; 2302 2303 /* Generate bitmap for TIM only if there are any STAs in power save 2304 * mode. */ 2305 if (atomic_read(&ps->num_sta_ps) > 0) 2306 /* in the hope that this is faster than 2307 * checking byte-for-byte */ 2308 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2309 IEEE80211_MAX_AID+1); 2310 2311 if (ps->dtim_count == 0) 2312 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2313 else 2314 ps->dtim_count--; 2315 2316 tim = pos = (u8 *) skb_put(skb, 6); 2317 *pos++ = WLAN_EID_TIM; 2318 *pos++ = 4; 2319 *pos++ = ps->dtim_count; 2320 *pos++ = sdata->vif.bss_conf.dtim_period; 2321 2322 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2323 aid0 = 1; 2324 2325 ps->dtim_bc_mc = aid0 == 1; 2326 2327 if (have_bits) { 2328 /* Find largest even number N1 so that bits numbered 1 through 2329 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2330 * (N2 + 1) x 8 through 2007 are 0. */ 2331 n1 = 0; 2332 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2333 if (ps->tim[i]) { 2334 n1 = i & 0xfe; 2335 break; 2336 } 2337 } 2338 n2 = n1; 2339 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2340 if (ps->tim[i]) { 2341 n2 = i; 2342 break; 2343 } 2344 } 2345 2346 /* Bitmap control */ 2347 *pos++ = n1 | aid0; 2348 /* Part Virt Bitmap */ 2349 skb_put(skb, n2 - n1); 2350 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2351 2352 tim[1] = n2 - n1 + 4; 2353 } else { 2354 *pos++ = aid0; /* Bitmap control */ 2355 *pos++ = 0; /* Part Virt Bitmap */ 2356 } 2357 } 2358 2359 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2360 struct ps_data *ps, struct sk_buff *skb) 2361 { 2362 struct ieee80211_local *local = sdata->local; 2363 2364 /* 2365 * Not very nice, but we want to allow the driver to call 2366 * ieee80211_beacon_get() as a response to the set_tim() 2367 * callback. That, however, is already invoked under the 2368 * sta_lock to guarantee consistent and race-free update 2369 * of the tim bitmap in mac80211 and the driver. 2370 */ 2371 if (local->tim_in_locked_section) { 2372 __ieee80211_beacon_add_tim(sdata, ps, skb); 2373 } else { 2374 spin_lock_bh(&local->tim_lock); 2375 __ieee80211_beacon_add_tim(sdata, ps, skb); 2376 spin_unlock_bh(&local->tim_lock); 2377 } 2378 2379 return 0; 2380 } 2381 2382 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2383 struct ieee80211_vif *vif, 2384 u16 *tim_offset, u16 *tim_length) 2385 { 2386 struct ieee80211_local *local = hw_to_local(hw); 2387 struct sk_buff *skb = NULL; 2388 struct ieee80211_tx_info *info; 2389 struct ieee80211_sub_if_data *sdata = NULL; 2390 enum ieee80211_band band; 2391 struct ieee80211_tx_rate_control txrc; 2392 struct ieee80211_chanctx_conf *chanctx_conf; 2393 2394 rcu_read_lock(); 2395 2396 sdata = vif_to_sdata(vif); 2397 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2398 2399 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2400 goto out; 2401 2402 if (tim_offset) 2403 *tim_offset = 0; 2404 if (tim_length) 2405 *tim_length = 0; 2406 2407 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2408 struct ieee80211_if_ap *ap = &sdata->u.ap; 2409 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2410 2411 if (beacon) { 2412 /* 2413 * headroom, head length, 2414 * tail length and maximum TIM length 2415 */ 2416 skb = dev_alloc_skb(local->tx_headroom + 2417 beacon->head_len + 2418 beacon->tail_len + 256); 2419 if (!skb) 2420 goto out; 2421 2422 skb_reserve(skb, local->tx_headroom); 2423 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2424 beacon->head_len); 2425 2426 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2427 2428 if (tim_offset) 2429 *tim_offset = beacon->head_len; 2430 if (tim_length) 2431 *tim_length = skb->len - beacon->head_len; 2432 2433 if (beacon->tail) 2434 memcpy(skb_put(skb, beacon->tail_len), 2435 beacon->tail, beacon->tail_len); 2436 } else 2437 goto out; 2438 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2439 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2440 struct ieee80211_hdr *hdr; 2441 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2442 2443 if (!presp) 2444 goto out; 2445 2446 skb = skb_copy(presp, GFP_ATOMIC); 2447 if (!skb) 2448 goto out; 2449 2450 hdr = (struct ieee80211_hdr *) skb->data; 2451 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2452 IEEE80211_STYPE_BEACON); 2453 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2454 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2455 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2456 2457 if (!bcn) 2458 goto out; 2459 2460 if (ifmsh->sync_ops) 2461 ifmsh->sync_ops->adjust_tbtt( 2462 sdata); 2463 2464 skb = dev_alloc_skb(local->tx_headroom + 2465 bcn->head_len + 2466 256 + /* TIM IE */ 2467 bcn->tail_len); 2468 if (!skb) 2469 goto out; 2470 skb_reserve(skb, local->tx_headroom); 2471 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2472 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2473 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2474 } else { 2475 WARN_ON(1); 2476 goto out; 2477 } 2478 2479 band = chanctx_conf->def.chan->band; 2480 2481 info = IEEE80211_SKB_CB(skb); 2482 2483 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2484 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2485 info->band = band; 2486 2487 memset(&txrc, 0, sizeof(txrc)); 2488 txrc.hw = hw; 2489 txrc.sband = local->hw.wiphy->bands[band]; 2490 txrc.bss_conf = &sdata->vif.bss_conf; 2491 txrc.skb = skb; 2492 txrc.reported_rate.idx = -1; 2493 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2494 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2495 txrc.max_rate_idx = -1; 2496 else 2497 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2498 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2499 sizeof(txrc.rate_idx_mcs_mask)); 2500 txrc.bss = true; 2501 rate_control_get_rate(sdata, NULL, &txrc); 2502 2503 info->control.vif = vif; 2504 2505 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2506 IEEE80211_TX_CTL_ASSIGN_SEQ | 2507 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2508 out: 2509 rcu_read_unlock(); 2510 return skb; 2511 } 2512 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2513 2514 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2515 struct ieee80211_vif *vif) 2516 { 2517 struct ieee80211_if_ap *ap = NULL; 2518 struct sk_buff *skb = NULL; 2519 struct probe_resp *presp = NULL; 2520 struct ieee80211_hdr *hdr; 2521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2522 2523 if (sdata->vif.type != NL80211_IFTYPE_AP) 2524 return NULL; 2525 2526 rcu_read_lock(); 2527 2528 ap = &sdata->u.ap; 2529 presp = rcu_dereference(ap->probe_resp); 2530 if (!presp) 2531 goto out; 2532 2533 skb = dev_alloc_skb(presp->len); 2534 if (!skb) 2535 goto out; 2536 2537 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2538 2539 hdr = (struct ieee80211_hdr *) skb->data; 2540 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2541 2542 out: 2543 rcu_read_unlock(); 2544 return skb; 2545 } 2546 EXPORT_SYMBOL(ieee80211_proberesp_get); 2547 2548 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2549 struct ieee80211_vif *vif) 2550 { 2551 struct ieee80211_sub_if_data *sdata; 2552 struct ieee80211_if_managed *ifmgd; 2553 struct ieee80211_pspoll *pspoll; 2554 struct ieee80211_local *local; 2555 struct sk_buff *skb; 2556 2557 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2558 return NULL; 2559 2560 sdata = vif_to_sdata(vif); 2561 ifmgd = &sdata->u.mgd; 2562 local = sdata->local; 2563 2564 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2565 if (!skb) 2566 return NULL; 2567 2568 skb_reserve(skb, local->hw.extra_tx_headroom); 2569 2570 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2571 memset(pspoll, 0, sizeof(*pspoll)); 2572 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2573 IEEE80211_STYPE_PSPOLL); 2574 pspoll->aid = cpu_to_le16(ifmgd->aid); 2575 2576 /* aid in PS-Poll has its two MSBs each set to 1 */ 2577 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2578 2579 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2580 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2581 2582 return skb; 2583 } 2584 EXPORT_SYMBOL(ieee80211_pspoll_get); 2585 2586 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2587 struct ieee80211_vif *vif) 2588 { 2589 struct ieee80211_hdr_3addr *nullfunc; 2590 struct ieee80211_sub_if_data *sdata; 2591 struct ieee80211_if_managed *ifmgd; 2592 struct ieee80211_local *local; 2593 struct sk_buff *skb; 2594 2595 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2596 return NULL; 2597 2598 sdata = vif_to_sdata(vif); 2599 ifmgd = &sdata->u.mgd; 2600 local = sdata->local; 2601 2602 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2603 if (!skb) 2604 return NULL; 2605 2606 skb_reserve(skb, local->hw.extra_tx_headroom); 2607 2608 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2609 sizeof(*nullfunc)); 2610 memset(nullfunc, 0, sizeof(*nullfunc)); 2611 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2612 IEEE80211_STYPE_NULLFUNC | 2613 IEEE80211_FCTL_TODS); 2614 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2615 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2616 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2617 2618 return skb; 2619 } 2620 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2621 2622 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2623 struct ieee80211_vif *vif, 2624 const u8 *ssid, size_t ssid_len, 2625 size_t tailroom) 2626 { 2627 struct ieee80211_sub_if_data *sdata; 2628 struct ieee80211_local *local; 2629 struct ieee80211_hdr_3addr *hdr; 2630 struct sk_buff *skb; 2631 size_t ie_ssid_len; 2632 u8 *pos; 2633 2634 sdata = vif_to_sdata(vif); 2635 local = sdata->local; 2636 ie_ssid_len = 2 + ssid_len; 2637 2638 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2639 ie_ssid_len + tailroom); 2640 if (!skb) 2641 return NULL; 2642 2643 skb_reserve(skb, local->hw.extra_tx_headroom); 2644 2645 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2646 memset(hdr, 0, sizeof(*hdr)); 2647 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2648 IEEE80211_STYPE_PROBE_REQ); 2649 eth_broadcast_addr(hdr->addr1); 2650 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2651 eth_broadcast_addr(hdr->addr3); 2652 2653 pos = skb_put(skb, ie_ssid_len); 2654 *pos++ = WLAN_EID_SSID; 2655 *pos++ = ssid_len; 2656 if (ssid_len) 2657 memcpy(pos, ssid, ssid_len); 2658 pos += ssid_len; 2659 2660 return skb; 2661 } 2662 EXPORT_SYMBOL(ieee80211_probereq_get); 2663 2664 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2665 const void *frame, size_t frame_len, 2666 const struct ieee80211_tx_info *frame_txctl, 2667 struct ieee80211_rts *rts) 2668 { 2669 const struct ieee80211_hdr *hdr = frame; 2670 2671 rts->frame_control = 2672 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2673 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2674 frame_txctl); 2675 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2676 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2677 } 2678 EXPORT_SYMBOL(ieee80211_rts_get); 2679 2680 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2681 const void *frame, size_t frame_len, 2682 const struct ieee80211_tx_info *frame_txctl, 2683 struct ieee80211_cts *cts) 2684 { 2685 const struct ieee80211_hdr *hdr = frame; 2686 2687 cts->frame_control = 2688 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2689 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2690 frame_len, frame_txctl); 2691 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2692 } 2693 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2694 2695 struct sk_buff * 2696 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2697 struct ieee80211_vif *vif) 2698 { 2699 struct ieee80211_local *local = hw_to_local(hw); 2700 struct sk_buff *skb = NULL; 2701 struct ieee80211_tx_data tx; 2702 struct ieee80211_sub_if_data *sdata; 2703 struct ps_data *ps; 2704 struct ieee80211_tx_info *info; 2705 struct ieee80211_chanctx_conf *chanctx_conf; 2706 2707 sdata = vif_to_sdata(vif); 2708 2709 rcu_read_lock(); 2710 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2711 2712 if (!chanctx_conf) 2713 goto out; 2714 2715 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2716 struct beacon_data *beacon = 2717 rcu_dereference(sdata->u.ap.beacon); 2718 2719 if (!beacon || !beacon->head) 2720 goto out; 2721 2722 ps = &sdata->u.ap.ps; 2723 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2724 ps = &sdata->u.mesh.ps; 2725 } else { 2726 goto out; 2727 } 2728 2729 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2730 goto out; /* send buffered bc/mc only after DTIM beacon */ 2731 2732 while (1) { 2733 skb = skb_dequeue(&ps->bc_buf); 2734 if (!skb) 2735 goto out; 2736 local->total_ps_buffered--; 2737 2738 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2739 struct ieee80211_hdr *hdr = 2740 (struct ieee80211_hdr *) skb->data; 2741 /* more buffered multicast/broadcast frames ==> set 2742 * MoreData flag in IEEE 802.11 header to inform PS 2743 * STAs */ 2744 hdr->frame_control |= 2745 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2746 } 2747 2748 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2749 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2750 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2751 break; 2752 dev_kfree_skb_any(skb); 2753 } 2754 2755 info = IEEE80211_SKB_CB(skb); 2756 2757 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2758 info->band = chanctx_conf->def.chan->band; 2759 2760 if (invoke_tx_handlers(&tx)) 2761 skb = NULL; 2762 out: 2763 rcu_read_unlock(); 2764 2765 return skb; 2766 } 2767 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2768 2769 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2770 struct sk_buff *skb, int tid, 2771 enum ieee80211_band band) 2772 { 2773 int ac = ieee802_1d_to_ac[tid & 7]; 2774 2775 skb_set_mac_header(skb, 0); 2776 skb_set_network_header(skb, 0); 2777 skb_set_transport_header(skb, 0); 2778 2779 skb_set_queue_mapping(skb, ac); 2780 skb->priority = tid; 2781 2782 skb->dev = sdata->dev; 2783 2784 /* 2785 * The other path calling ieee80211_xmit is from the tasklet, 2786 * and while we can handle concurrent transmissions locking 2787 * requirements are that we do not come into tx with bhs on. 2788 */ 2789 local_bh_disable(); 2790 ieee80211_xmit(sdata, skb, band); 2791 local_bh_enable(); 2792 } 2793