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 (tx->rate.flags & IEEE80211_TX_RC_MCS) 52 return 0; 53 54 /* uh huh? */ 55 if (WARN_ON_ONCE(tx->rate.idx < 0)) 56 return 0; 57 58 sband = local->hw.wiphy->bands[info->band]; 59 txrate = &sband->bitrates[tx->rate.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_MAX_QUEUE_MAP, 237 IEEE80211_QUEUE_STOP_REASON_PS); 238 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 239 ieee80211_queue_work(&local->hw, 240 &local->dynamic_ps_disable_work); 241 } 242 243 /* Don't restart the timer if we're not disassociated */ 244 if (!ifmgd->associated) 245 return TX_CONTINUE; 246 247 mod_timer(&local->dynamic_ps_timer, jiffies + 248 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 249 250 return TX_CONTINUE; 251 } 252 253 static ieee80211_tx_result debug_noinline 254 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 255 { 256 257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 259 bool assoc = false; 260 261 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 262 return TX_CONTINUE; 263 264 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 265 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 266 !ieee80211_is_probe_req(hdr->frame_control) && 267 !ieee80211_is_nullfunc(hdr->frame_control)) 268 /* 269 * When software scanning only nullfunc frames (to notify 270 * the sleep state to the AP) and probe requests (for the 271 * active scan) are allowed, all other frames should not be 272 * sent and we should not get here, but if we do 273 * nonetheless, drop them to avoid sending them 274 * off-channel. See the link below and 275 * ieee80211_start_scan() for more. 276 * 277 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 278 */ 279 return TX_DROP; 280 281 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 282 return TX_CONTINUE; 283 284 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 285 return TX_CONTINUE; 286 287 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 288 return TX_CONTINUE; 289 290 if (tx->sta) 291 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 292 293 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 294 if (unlikely(!assoc && 295 ieee80211_is_data(hdr->frame_control))) { 296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 297 sdata_info(tx->sdata, 298 "dropped data frame to not associated station %pM\n", 299 hdr->addr1); 300 #endif 301 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 302 return TX_DROP; 303 } 304 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 305 ieee80211_is_data(hdr->frame_control) && 306 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 307 /* 308 * No associated STAs - no need to send multicast 309 * frames. 310 */ 311 return TX_DROP; 312 } 313 314 return TX_CONTINUE; 315 } 316 317 /* This function is called whenever the AP is about to exceed the maximum limit 318 * of buffered frames for power saving STAs. This situation should not really 319 * happen often during normal operation, so dropping the oldest buffered packet 320 * from each queue should be OK to make some room for new frames. */ 321 static void purge_old_ps_buffers(struct ieee80211_local *local) 322 { 323 int total = 0, purged = 0; 324 struct sk_buff *skb; 325 struct ieee80211_sub_if_data *sdata; 326 struct sta_info *sta; 327 328 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 329 struct ps_data *ps; 330 331 if (sdata->vif.type == NL80211_IFTYPE_AP) 332 ps = &sdata->u.ap.ps; 333 else if (ieee80211_vif_is_mesh(&sdata->vif)) 334 ps = &sdata->u.mesh.ps; 335 else 336 continue; 337 338 skb = skb_dequeue(&ps->bc_buf); 339 if (skb) { 340 purged++; 341 dev_kfree_skb(skb); 342 } 343 total += skb_queue_len(&ps->bc_buf); 344 } 345 346 /* 347 * Drop one frame from each station from the lowest-priority 348 * AC that has frames at all. 349 */ 350 list_for_each_entry_rcu(sta, &local->sta_list, list) { 351 int ac; 352 353 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 354 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 355 total += skb_queue_len(&sta->ps_tx_buf[ac]); 356 if (skb) { 357 purged++; 358 ieee80211_free_txskb(&local->hw, skb); 359 break; 360 } 361 } 362 } 363 364 local->total_ps_buffered = total; 365 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 366 } 367 368 static ieee80211_tx_result 369 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 370 { 371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 372 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 373 struct ps_data *ps; 374 375 /* 376 * broadcast/multicast frame 377 * 378 * If any of the associated/peer stations is in power save mode, 379 * the frame is buffered to be sent after DTIM beacon frame. 380 * This is done either by the hardware or us. 381 */ 382 383 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 384 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 385 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 386 if (!tx->sdata->bss) 387 return TX_CONTINUE; 388 389 ps = &tx->sdata->bss->ps; 390 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 391 ps = &tx->sdata->u.mesh.ps; 392 } else { 393 return TX_CONTINUE; 394 } 395 396 397 /* no buffering for ordered frames */ 398 if (ieee80211_has_order(hdr->frame_control)) 399 return TX_CONTINUE; 400 401 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 402 info->hw_queue = tx->sdata->vif.cab_queue; 403 404 /* no stations in PS mode */ 405 if (!atomic_read(&ps->num_sta_ps)) 406 return TX_CONTINUE; 407 408 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 409 410 /* device releases frame after DTIM beacon */ 411 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 412 return TX_CONTINUE; 413 414 /* buffered in mac80211 */ 415 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 416 purge_old_ps_buffers(tx->local); 417 418 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 419 ps_dbg(tx->sdata, 420 "BC TX buffer full - dropping the oldest frame\n"); 421 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 422 } else 423 tx->local->total_ps_buffered++; 424 425 skb_queue_tail(&ps->bc_buf, tx->skb); 426 427 return TX_QUEUED; 428 } 429 430 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 431 struct sk_buff *skb) 432 { 433 if (!ieee80211_is_mgmt(fc)) 434 return 0; 435 436 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 437 return 0; 438 439 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 440 skb->data)) 441 return 0; 442 443 return 1; 444 } 445 446 static ieee80211_tx_result 447 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 448 { 449 struct sta_info *sta = tx->sta; 450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 452 struct ieee80211_local *local = tx->local; 453 454 if (unlikely(!sta)) 455 return TX_CONTINUE; 456 457 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 458 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 459 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 460 int ac = skb_get_queue_mapping(tx->skb); 461 462 /* only deauth, disassoc and action are bufferable MMPDUs */ 463 if (ieee80211_is_mgmt(hdr->frame_control) && 464 !ieee80211_is_deauth(hdr->frame_control) && 465 !ieee80211_is_disassoc(hdr->frame_control) && 466 !ieee80211_is_action(hdr->frame_control)) { 467 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 468 return TX_CONTINUE; 469 } 470 471 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 472 sta->sta.addr, sta->sta.aid, ac); 473 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 474 purge_old_ps_buffers(tx->local); 475 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 476 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 477 ps_dbg(tx->sdata, 478 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 479 sta->sta.addr, ac); 480 ieee80211_free_txskb(&local->hw, old); 481 } else 482 tx->local->total_ps_buffered++; 483 484 info->control.jiffies = jiffies; 485 info->control.vif = &tx->sdata->vif; 486 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 487 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 488 489 if (!timer_pending(&local->sta_cleanup)) 490 mod_timer(&local->sta_cleanup, 491 round_jiffies(jiffies + 492 STA_INFO_CLEANUP_INTERVAL)); 493 494 /* 495 * We queued up some frames, so the TIM bit might 496 * need to be set, recalculate it. 497 */ 498 sta_info_recalc_tim(sta); 499 500 return TX_QUEUED; 501 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 502 ps_dbg(tx->sdata, 503 "STA %pM in PS mode, but polling/in SP -> send frame\n", 504 sta->sta.addr); 505 } 506 507 return TX_CONTINUE; 508 } 509 510 static ieee80211_tx_result debug_noinline 511 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 512 { 513 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 514 return TX_CONTINUE; 515 516 if (tx->flags & IEEE80211_TX_UNICAST) 517 return ieee80211_tx_h_unicast_ps_buf(tx); 518 else 519 return ieee80211_tx_h_multicast_ps_buf(tx); 520 } 521 522 static ieee80211_tx_result debug_noinline 523 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 524 { 525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 526 527 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 528 tx->sdata->control_port_no_encrypt)) 529 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 530 531 return TX_CONTINUE; 532 } 533 534 static ieee80211_tx_result debug_noinline 535 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 536 { 537 struct ieee80211_key *key; 538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 540 541 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 542 tx->key = NULL; 543 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 544 tx->key = key; 545 else if (ieee80211_is_mgmt(hdr->frame_control) && 546 is_multicast_ether_addr(hdr->addr1) && 547 ieee80211_is_robust_mgmt_frame(hdr) && 548 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 549 tx->key = key; 550 else if (is_multicast_ether_addr(hdr->addr1) && 551 (key = rcu_dereference(tx->sdata->default_multicast_key))) 552 tx->key = key; 553 else if (!is_multicast_ether_addr(hdr->addr1) && 554 (key = rcu_dereference(tx->sdata->default_unicast_key))) 555 tx->key = key; 556 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 557 tx->key = NULL; 558 else if (!tx->sdata->drop_unencrypted) 559 tx->key = NULL; 560 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 561 tx->key = NULL; 562 else if (ieee80211_is_robust_mgmt_frame(hdr) && 563 !(ieee80211_is_action(hdr->frame_control) && 564 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 565 tx->key = NULL; 566 else if (ieee80211_is_mgmt(hdr->frame_control) && 567 !ieee80211_is_robust_mgmt_frame(hdr)) 568 tx->key = NULL; 569 else { 570 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 571 return TX_DROP; 572 } 573 574 if (tx->key) { 575 bool skip_hw = false; 576 577 tx->key->tx_rx_count++; 578 /* TODO: add threshold stuff again */ 579 580 switch (tx->key->conf.cipher) { 581 case WLAN_CIPHER_SUITE_WEP40: 582 case WLAN_CIPHER_SUITE_WEP104: 583 case WLAN_CIPHER_SUITE_TKIP: 584 if (!ieee80211_is_data_present(hdr->frame_control)) 585 tx->key = NULL; 586 break; 587 case WLAN_CIPHER_SUITE_CCMP: 588 if (!ieee80211_is_data_present(hdr->frame_control) && 589 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 590 tx->skb)) 591 tx->key = NULL; 592 else 593 skip_hw = (tx->key->conf.flags & 594 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 595 ieee80211_is_mgmt(hdr->frame_control); 596 break; 597 case WLAN_CIPHER_SUITE_AES_CMAC: 598 if (!ieee80211_is_mgmt(hdr->frame_control)) 599 tx->key = NULL; 600 break; 601 } 602 603 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 604 !ieee80211_is_deauth(hdr->frame_control))) 605 return TX_DROP; 606 607 if (!skip_hw && tx->key && 608 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 609 info->control.hw_key = &tx->key->conf; 610 } 611 612 return TX_CONTINUE; 613 } 614 615 static ieee80211_tx_result debug_noinline 616 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 617 { 618 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 619 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 620 struct ieee80211_supported_band *sband; 621 u32 len; 622 struct ieee80211_tx_rate_control txrc; 623 struct ieee80211_sta_rates *ratetbl = NULL; 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; 644 645 if (tx->sdata->rc_has_mcs_mask[info->band]) 646 txrc.rate_idx_mcs_mask = 647 tx->sdata->rc_rateidx_mcs_mask[info->band]; 648 649 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 650 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 651 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 652 653 /* set up RTS protection if desired */ 654 if (len > tx->local->hw.wiphy->rts_threshold) { 655 txrc.rts = true; 656 } 657 658 info->control.use_rts = txrc.rts; 659 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 660 661 /* 662 * Use short preamble if the BSS can handle it, but not for 663 * management frames unless we know the receiver can handle 664 * that -- the management frame might be to a station that 665 * just wants a probe response. 666 */ 667 if (tx->sdata->vif.bss_conf.use_short_preamble && 668 (ieee80211_is_data(hdr->frame_control) || 669 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 670 txrc.short_preamble = true; 671 672 info->control.short_preamble = txrc.short_preamble; 673 674 if (tx->sta) 675 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 676 677 /* 678 * Lets not bother rate control if we're associated and cannot 679 * talk to the sta. This should not happen. 680 */ 681 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 682 !rate_usable_index_exists(sband, &tx->sta->sta), 683 "%s: Dropped data frame as no usable bitrate found while " 684 "scanning and associated. Target station: " 685 "%pM on %d GHz band\n", 686 tx->sdata->name, hdr->addr1, 687 info->band ? 5 : 2)) 688 return TX_DROP; 689 690 /* 691 * If we're associated with the sta at this point we know we can at 692 * least send the frame at the lowest bit rate. 693 */ 694 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 695 696 if (tx->sta && !info->control.skip_table) 697 ratetbl = rcu_dereference(tx->sta->sta.rates); 698 699 if (unlikely(info->control.rates[0].idx < 0)) { 700 if (ratetbl) { 701 struct ieee80211_tx_rate rate = { 702 .idx = ratetbl->rate[0].idx, 703 .flags = ratetbl->rate[0].flags, 704 .count = ratetbl->rate[0].count 705 }; 706 707 if (ratetbl->rate[0].idx < 0) 708 return TX_DROP; 709 710 tx->rate = rate; 711 } else { 712 return TX_DROP; 713 } 714 } else { 715 tx->rate = info->control.rates[0]; 716 } 717 718 if (txrc.reported_rate.idx < 0) { 719 txrc.reported_rate = tx->rate; 720 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 721 tx->sta->last_tx_rate = txrc.reported_rate; 722 } else if (tx->sta) 723 tx->sta->last_tx_rate = txrc.reported_rate; 724 725 if (ratetbl) 726 return TX_CONTINUE; 727 728 if (unlikely(!info->control.rates[0].count)) 729 info->control.rates[0].count = 1; 730 731 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 732 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 733 info->control.rates[0].count = 1; 734 735 return TX_CONTINUE; 736 } 737 738 static ieee80211_tx_result debug_noinline 739 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 740 { 741 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 742 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 743 u16 *seq; 744 u8 *qc; 745 int tid; 746 747 /* 748 * Packet injection may want to control the sequence 749 * number, if we have no matching interface then we 750 * neither assign one ourselves nor ask the driver to. 751 */ 752 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 753 return TX_CONTINUE; 754 755 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 756 return TX_CONTINUE; 757 758 if (ieee80211_hdrlen(hdr->frame_control) < 24) 759 return TX_CONTINUE; 760 761 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 762 return TX_CONTINUE; 763 764 /* 765 * Anything but QoS data that has a sequence number field 766 * (is long enough) gets a sequence number from the global 767 * counter. 768 */ 769 if (!ieee80211_is_data_qos(hdr->frame_control)) { 770 /* driver should assign sequence number */ 771 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 772 /* for pure STA mode without beacons, we can do it */ 773 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 774 tx->sdata->sequence_number += 0x10; 775 return TX_CONTINUE; 776 } 777 778 /* 779 * This should be true for injected/management frames only, for 780 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 781 * above since they are not QoS-data frames. 782 */ 783 if (!tx->sta) 784 return TX_CONTINUE; 785 786 /* include per-STA, per-TID sequence counter */ 787 788 qc = ieee80211_get_qos_ctl(hdr); 789 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 790 seq = &tx->sta->tid_seq[tid]; 791 792 hdr->seq_ctrl = cpu_to_le16(*seq); 793 794 /* Increase the sequence number. */ 795 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 796 797 return TX_CONTINUE; 798 } 799 800 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 801 struct sk_buff *skb, int hdrlen, 802 int frag_threshold) 803 { 804 struct ieee80211_local *local = tx->local; 805 struct ieee80211_tx_info *info; 806 struct sk_buff *tmp; 807 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 808 int pos = hdrlen + per_fragm; 809 int rem = skb->len - hdrlen - per_fragm; 810 811 if (WARN_ON(rem < 0)) 812 return -EINVAL; 813 814 /* first fragment was already added to queue by caller */ 815 816 while (rem) { 817 int fraglen = per_fragm; 818 819 if (fraglen > rem) 820 fraglen = rem; 821 rem -= fraglen; 822 tmp = dev_alloc_skb(local->tx_headroom + 823 frag_threshold + 824 IEEE80211_ENCRYPT_HEADROOM + 825 IEEE80211_ENCRYPT_TAILROOM); 826 if (!tmp) 827 return -ENOMEM; 828 829 __skb_queue_tail(&tx->skbs, tmp); 830 831 skb_reserve(tmp, local->tx_headroom + 832 IEEE80211_ENCRYPT_HEADROOM); 833 /* copy control information */ 834 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 835 836 info = IEEE80211_SKB_CB(tmp); 837 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 838 IEEE80211_TX_CTL_FIRST_FRAGMENT); 839 840 if (rem) 841 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 842 843 skb_copy_queue_mapping(tmp, skb); 844 tmp->priority = skb->priority; 845 tmp->dev = skb->dev; 846 847 /* copy header and data */ 848 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 849 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 850 851 pos += fraglen; 852 } 853 854 /* adjust first fragment's length */ 855 skb->len = hdrlen + per_fragm; 856 return 0; 857 } 858 859 static ieee80211_tx_result debug_noinline 860 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 861 { 862 struct sk_buff *skb = tx->skb; 863 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 864 struct ieee80211_hdr *hdr = (void *)skb->data; 865 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 866 int hdrlen; 867 int fragnum; 868 869 /* no matter what happens, tx->skb moves to tx->skbs */ 870 __skb_queue_tail(&tx->skbs, skb); 871 tx->skb = NULL; 872 873 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 874 return TX_CONTINUE; 875 876 if (tx->local->ops->set_frag_threshold) 877 return TX_CONTINUE; 878 879 /* 880 * Warn when submitting a fragmented A-MPDU frame and drop it. 881 * This scenario is handled in ieee80211_tx_prepare but extra 882 * caution taken here as fragmented ampdu may cause Tx stop. 883 */ 884 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 885 return TX_DROP; 886 887 hdrlen = ieee80211_hdrlen(hdr->frame_control); 888 889 /* internal error, why isn't DONTFRAG set? */ 890 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 891 return TX_DROP; 892 893 /* 894 * Now fragment the frame. This will allocate all the fragments and 895 * chain them (using skb as the first fragment) to skb->next. 896 * During transmission, we will remove the successfully transmitted 897 * fragments from this list. When the low-level driver rejects one 898 * of the fragments then we will simply pretend to accept the skb 899 * but store it away as pending. 900 */ 901 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 902 return TX_DROP; 903 904 /* update duration/seq/flags of fragments */ 905 fragnum = 0; 906 907 skb_queue_walk(&tx->skbs, skb) { 908 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 909 910 hdr = (void *)skb->data; 911 info = IEEE80211_SKB_CB(skb); 912 913 if (!skb_queue_is_last(&tx->skbs, skb)) { 914 hdr->frame_control |= morefrags; 915 /* 916 * No multi-rate retries for fragmented frames, that 917 * would completely throw off the NAV at other STAs. 918 */ 919 info->control.rates[1].idx = -1; 920 info->control.rates[2].idx = -1; 921 info->control.rates[3].idx = -1; 922 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 923 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 924 } else { 925 hdr->frame_control &= ~morefrags; 926 } 927 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 928 fragnum++; 929 } 930 931 return TX_CONTINUE; 932 } 933 934 static ieee80211_tx_result debug_noinline 935 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 936 { 937 struct sk_buff *skb; 938 int ac = -1; 939 940 if (!tx->sta) 941 return TX_CONTINUE; 942 943 skb_queue_walk(&tx->skbs, skb) { 944 ac = skb_get_queue_mapping(skb); 945 tx->sta->tx_fragments++; 946 tx->sta->tx_bytes[ac] += skb->len; 947 } 948 if (ac >= 0) 949 tx->sta->tx_packets[ac]++; 950 951 return TX_CONTINUE; 952 } 953 954 static ieee80211_tx_result debug_noinline 955 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 956 { 957 if (!tx->key) 958 return TX_CONTINUE; 959 960 switch (tx->key->conf.cipher) { 961 case WLAN_CIPHER_SUITE_WEP40: 962 case WLAN_CIPHER_SUITE_WEP104: 963 return ieee80211_crypto_wep_encrypt(tx); 964 case WLAN_CIPHER_SUITE_TKIP: 965 return ieee80211_crypto_tkip_encrypt(tx); 966 case WLAN_CIPHER_SUITE_CCMP: 967 return ieee80211_crypto_ccmp_encrypt(tx); 968 case WLAN_CIPHER_SUITE_AES_CMAC: 969 return ieee80211_crypto_aes_cmac_encrypt(tx); 970 default: 971 return ieee80211_crypto_hw_encrypt(tx); 972 } 973 974 return TX_DROP; 975 } 976 977 static ieee80211_tx_result debug_noinline 978 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 979 { 980 struct sk_buff *skb; 981 struct ieee80211_hdr *hdr; 982 int next_len; 983 bool group_addr; 984 985 skb_queue_walk(&tx->skbs, skb) { 986 hdr = (void *) skb->data; 987 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 988 break; /* must not overwrite AID */ 989 if (!skb_queue_is_last(&tx->skbs, skb)) { 990 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 991 next_len = next->len; 992 } else 993 next_len = 0; 994 group_addr = is_multicast_ether_addr(hdr->addr1); 995 996 hdr->duration_id = 997 ieee80211_duration(tx, skb, group_addr, next_len); 998 } 999 1000 return TX_CONTINUE; 1001 } 1002 1003 /* actual transmit path */ 1004 1005 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1006 struct sk_buff *skb, 1007 struct ieee80211_tx_info *info, 1008 struct tid_ampdu_tx *tid_tx, 1009 int tid) 1010 { 1011 bool queued = false; 1012 bool reset_agg_timer = false; 1013 struct sk_buff *purge_skb = NULL; 1014 1015 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1016 info->flags |= IEEE80211_TX_CTL_AMPDU; 1017 reset_agg_timer = true; 1018 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1019 /* 1020 * nothing -- this aggregation session is being started 1021 * but that might still fail with the driver 1022 */ 1023 } else { 1024 spin_lock(&tx->sta->lock); 1025 /* 1026 * Need to re-check now, because we may get here 1027 * 1028 * 1) in the window during which the setup is actually 1029 * already done, but not marked yet because not all 1030 * packets are spliced over to the driver pending 1031 * queue yet -- if this happened we acquire the lock 1032 * either before or after the splice happens, but 1033 * need to recheck which of these cases happened. 1034 * 1035 * 2) during session teardown, if the OPERATIONAL bit 1036 * was cleared due to the teardown but the pointer 1037 * hasn't been assigned NULL yet (or we loaded it 1038 * before it was assigned) -- in this case it may 1039 * now be NULL which means we should just let the 1040 * packet pass through because splicing the frames 1041 * back is already done. 1042 */ 1043 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1044 1045 if (!tid_tx) { 1046 /* do nothing, let packet pass through */ 1047 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1048 info->flags |= IEEE80211_TX_CTL_AMPDU; 1049 reset_agg_timer = true; 1050 } else { 1051 queued = true; 1052 info->control.vif = &tx->sdata->vif; 1053 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1054 __skb_queue_tail(&tid_tx->pending, skb); 1055 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1056 purge_skb = __skb_dequeue(&tid_tx->pending); 1057 } 1058 spin_unlock(&tx->sta->lock); 1059 1060 if (purge_skb) 1061 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1062 } 1063 1064 /* reset session timer */ 1065 if (reset_agg_timer && tid_tx->timeout) 1066 tid_tx->last_tx = jiffies; 1067 1068 return queued; 1069 } 1070 1071 /* 1072 * initialises @tx 1073 */ 1074 static ieee80211_tx_result 1075 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1076 struct ieee80211_tx_data *tx, 1077 struct sk_buff *skb) 1078 { 1079 struct ieee80211_local *local = sdata->local; 1080 struct ieee80211_hdr *hdr; 1081 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1082 int tid; 1083 u8 *qc; 1084 1085 memset(tx, 0, sizeof(*tx)); 1086 tx->skb = skb; 1087 tx->local = local; 1088 tx->sdata = sdata; 1089 __skb_queue_head_init(&tx->skbs); 1090 1091 /* 1092 * If this flag is set to true anywhere, and we get here, 1093 * we are doing the needed processing, so remove the flag 1094 * now. 1095 */ 1096 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1097 1098 hdr = (struct ieee80211_hdr *) skb->data; 1099 1100 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1101 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1102 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1103 return TX_DROP; 1104 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1105 tx->sdata->control_port_protocol == tx->skb->protocol) { 1106 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1107 } 1108 if (!tx->sta) 1109 tx->sta = sta_info_get(sdata, hdr->addr1); 1110 1111 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1112 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1113 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1114 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1115 struct tid_ampdu_tx *tid_tx; 1116 1117 qc = ieee80211_get_qos_ctl(hdr); 1118 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1119 1120 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1121 if (tid_tx) { 1122 bool queued; 1123 1124 queued = ieee80211_tx_prep_agg(tx, skb, info, 1125 tid_tx, tid); 1126 1127 if (unlikely(queued)) 1128 return TX_QUEUED; 1129 } 1130 } 1131 1132 if (is_multicast_ether_addr(hdr->addr1)) { 1133 tx->flags &= ~IEEE80211_TX_UNICAST; 1134 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1135 } else 1136 tx->flags |= IEEE80211_TX_UNICAST; 1137 1138 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1139 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1140 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1141 info->flags & IEEE80211_TX_CTL_AMPDU) 1142 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1143 } 1144 1145 if (!tx->sta) 1146 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1147 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1148 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1149 1150 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1151 1152 return TX_CONTINUE; 1153 } 1154 1155 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1156 struct ieee80211_vif *vif, 1157 struct ieee80211_sta *sta, 1158 struct sk_buff_head *skbs, 1159 bool txpending) 1160 { 1161 struct ieee80211_tx_control control; 1162 struct sk_buff *skb, *tmp; 1163 unsigned long flags; 1164 1165 skb_queue_walk_safe(skbs, skb, tmp) { 1166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1167 int q = info->hw_queue; 1168 1169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1170 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1171 __skb_unlink(skb, skbs); 1172 ieee80211_free_txskb(&local->hw, skb); 1173 continue; 1174 } 1175 #endif 1176 1177 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1178 if (local->queue_stop_reasons[q] || 1179 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1180 if (unlikely(info->flags & 1181 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1182 if (local->queue_stop_reasons[q] & 1183 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1184 /* 1185 * Drop off-channel frames if queues 1186 * are stopped for any reason other 1187 * than off-channel operation. Never 1188 * queue them. 1189 */ 1190 spin_unlock_irqrestore( 1191 &local->queue_stop_reason_lock, 1192 flags); 1193 ieee80211_purge_tx_queue(&local->hw, 1194 skbs); 1195 return true; 1196 } 1197 } else { 1198 1199 /* 1200 * Since queue is stopped, queue up frames for 1201 * later transmission from the tx-pending 1202 * tasklet when the queue is woken again. 1203 */ 1204 if (txpending) 1205 skb_queue_splice_init(skbs, 1206 &local->pending[q]); 1207 else 1208 skb_queue_splice_tail_init(skbs, 1209 &local->pending[q]); 1210 1211 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1212 flags); 1213 return false; 1214 } 1215 } 1216 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1217 1218 info->control.vif = vif; 1219 control.sta = sta; 1220 1221 __skb_unlink(skb, skbs); 1222 drv_tx(local, &control, skb); 1223 } 1224 1225 return true; 1226 } 1227 1228 /* 1229 * Returns false if the frame couldn't be transmitted but was queued instead. 1230 */ 1231 static bool __ieee80211_tx(struct ieee80211_local *local, 1232 struct sk_buff_head *skbs, int led_len, 1233 struct sta_info *sta, bool txpending) 1234 { 1235 struct ieee80211_tx_info *info; 1236 struct ieee80211_sub_if_data *sdata; 1237 struct ieee80211_vif *vif; 1238 struct ieee80211_sta *pubsta; 1239 struct sk_buff *skb; 1240 bool result = true; 1241 __le16 fc; 1242 1243 if (WARN_ON(skb_queue_empty(skbs))) 1244 return true; 1245 1246 skb = skb_peek(skbs); 1247 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1248 info = IEEE80211_SKB_CB(skb); 1249 sdata = vif_to_sdata(info->control.vif); 1250 if (sta && !sta->uploaded) 1251 sta = NULL; 1252 1253 if (sta) 1254 pubsta = &sta->sta; 1255 else 1256 pubsta = NULL; 1257 1258 switch (sdata->vif.type) { 1259 case NL80211_IFTYPE_MONITOR: 1260 sdata = rcu_dereference(local->monitor_sdata); 1261 if (sdata) { 1262 vif = &sdata->vif; 1263 info->hw_queue = 1264 vif->hw_queue[skb_get_queue_mapping(skb)]; 1265 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1266 dev_kfree_skb(skb); 1267 return true; 1268 } else 1269 vif = NULL; 1270 break; 1271 case NL80211_IFTYPE_AP_VLAN: 1272 sdata = container_of(sdata->bss, 1273 struct ieee80211_sub_if_data, u.ap); 1274 /* fall through */ 1275 default: 1276 vif = &sdata->vif; 1277 break; 1278 } 1279 1280 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1281 txpending); 1282 1283 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1284 ieee80211_led_tx(local, 1); 1285 1286 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1287 1288 return result; 1289 } 1290 1291 /* 1292 * Invoke TX handlers, return 0 on success and non-zero if the 1293 * frame was dropped or queued. 1294 */ 1295 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1296 { 1297 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1298 ieee80211_tx_result res = TX_DROP; 1299 1300 #define CALL_TXH(txh) \ 1301 do { \ 1302 res = txh(tx); \ 1303 if (res != TX_CONTINUE) \ 1304 goto txh_done; \ 1305 } while (0) 1306 1307 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1308 CALL_TXH(ieee80211_tx_h_check_assoc); 1309 CALL_TXH(ieee80211_tx_h_ps_buf); 1310 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1311 CALL_TXH(ieee80211_tx_h_select_key); 1312 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1313 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1314 1315 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1316 __skb_queue_tail(&tx->skbs, tx->skb); 1317 tx->skb = NULL; 1318 goto txh_done; 1319 } 1320 1321 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1322 CALL_TXH(ieee80211_tx_h_sequence); 1323 CALL_TXH(ieee80211_tx_h_fragment); 1324 /* handlers after fragment must be aware of tx info fragmentation! */ 1325 CALL_TXH(ieee80211_tx_h_stats); 1326 CALL_TXH(ieee80211_tx_h_encrypt); 1327 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1328 CALL_TXH(ieee80211_tx_h_calculate_duration); 1329 #undef CALL_TXH 1330 1331 txh_done: 1332 if (unlikely(res == TX_DROP)) { 1333 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1334 if (tx->skb) 1335 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1336 else 1337 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1338 return -1; 1339 } else if (unlikely(res == TX_QUEUED)) { 1340 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1341 return -1; 1342 } 1343 1344 return 0; 1345 } 1346 1347 /* 1348 * Returns false if the frame couldn't be transmitted but was queued instead. 1349 */ 1350 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1351 struct sk_buff *skb, bool txpending, 1352 enum ieee80211_band band) 1353 { 1354 struct ieee80211_local *local = sdata->local; 1355 struct ieee80211_tx_data tx; 1356 ieee80211_tx_result res_prepare; 1357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1358 bool result = true; 1359 int led_len; 1360 1361 if (unlikely(skb->len < 10)) { 1362 dev_kfree_skb(skb); 1363 return true; 1364 } 1365 1366 /* initialises tx */ 1367 led_len = skb->len; 1368 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1369 1370 if (unlikely(res_prepare == TX_DROP)) { 1371 ieee80211_free_txskb(&local->hw, skb); 1372 return true; 1373 } else if (unlikely(res_prepare == TX_QUEUED)) { 1374 return true; 1375 } 1376 1377 info->band = band; 1378 1379 /* set up hw_queue value early */ 1380 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1381 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1382 info->hw_queue = 1383 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1384 1385 if (!invoke_tx_handlers(&tx)) 1386 result = __ieee80211_tx(local, &tx.skbs, led_len, 1387 tx.sta, txpending); 1388 1389 return result; 1390 } 1391 1392 /* device xmit handlers */ 1393 1394 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1395 struct sk_buff *skb, 1396 int head_need, bool may_encrypt) 1397 { 1398 struct ieee80211_local *local = sdata->local; 1399 int tail_need = 0; 1400 1401 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1402 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1403 tail_need -= skb_tailroom(skb); 1404 tail_need = max_t(int, tail_need, 0); 1405 } 1406 1407 if (skb_cloned(skb)) 1408 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1409 else if (head_need || tail_need) 1410 I802_DEBUG_INC(local->tx_expand_skb_head); 1411 else 1412 return 0; 1413 1414 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1415 wiphy_debug(local->hw.wiphy, 1416 "failed to reallocate TX buffer\n"); 1417 return -ENOMEM; 1418 } 1419 1420 return 0; 1421 } 1422 1423 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1424 enum ieee80211_band band) 1425 { 1426 struct ieee80211_local *local = sdata->local; 1427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1428 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1429 int headroom; 1430 bool may_encrypt; 1431 1432 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1433 1434 headroom = local->tx_headroom; 1435 if (may_encrypt) 1436 headroom += IEEE80211_ENCRYPT_HEADROOM; 1437 headroom -= skb_headroom(skb); 1438 headroom = max_t(int, 0, headroom); 1439 1440 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1441 ieee80211_free_txskb(&local->hw, skb); 1442 return; 1443 } 1444 1445 hdr = (struct ieee80211_hdr *) skb->data; 1446 info->control.vif = &sdata->vif; 1447 1448 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1449 if (ieee80211_is_data(hdr->frame_control) && 1450 is_unicast_ether_addr(hdr->addr1)) { 1451 if (mesh_nexthop_resolve(sdata, skb)) 1452 return; /* skb queued: don't free */ 1453 } else { 1454 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1455 } 1456 } 1457 1458 ieee80211_set_qos_hdr(sdata, skb); 1459 ieee80211_tx(sdata, skb, false, band); 1460 } 1461 1462 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1463 { 1464 struct ieee80211_radiotap_iterator iterator; 1465 struct ieee80211_radiotap_header *rthdr = 1466 (struct ieee80211_radiotap_header *) skb->data; 1467 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1468 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1469 NULL); 1470 u16 txflags; 1471 1472 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1473 IEEE80211_TX_CTL_DONTFRAG; 1474 1475 /* 1476 * for every radiotap entry that is present 1477 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1478 * entries present, or -EINVAL on error) 1479 */ 1480 1481 while (!ret) { 1482 ret = ieee80211_radiotap_iterator_next(&iterator); 1483 1484 if (ret) 1485 continue; 1486 1487 /* see if this argument is something we can use */ 1488 switch (iterator.this_arg_index) { 1489 /* 1490 * You must take care when dereferencing iterator.this_arg 1491 * for multibyte types... the pointer is not aligned. Use 1492 * get_unaligned((type *)iterator.this_arg) to dereference 1493 * iterator.this_arg for type "type" safely on all arches. 1494 */ 1495 case IEEE80211_RADIOTAP_FLAGS: 1496 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1497 /* 1498 * this indicates that the skb we have been 1499 * handed has the 32-bit FCS CRC at the end... 1500 * we should react to that by snipping it off 1501 * because it will be recomputed and added 1502 * on transmission 1503 */ 1504 if (skb->len < (iterator._max_length + FCS_LEN)) 1505 return false; 1506 1507 skb_trim(skb, skb->len - FCS_LEN); 1508 } 1509 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1510 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1511 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1512 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1513 break; 1514 1515 case IEEE80211_RADIOTAP_TX_FLAGS: 1516 txflags = get_unaligned_le16(iterator.this_arg); 1517 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1518 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1519 break; 1520 1521 /* 1522 * Please update the file 1523 * Documentation/networking/mac80211-injection.txt 1524 * when parsing new fields here. 1525 */ 1526 1527 default: 1528 break; 1529 } 1530 } 1531 1532 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1533 return false; 1534 1535 /* 1536 * remove the radiotap header 1537 * iterator->_max_length was sanity-checked against 1538 * skb->len by iterator init 1539 */ 1540 skb_pull(skb, iterator._max_length); 1541 1542 return true; 1543 } 1544 1545 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1546 struct net_device *dev) 1547 { 1548 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1549 struct ieee80211_chanctx_conf *chanctx_conf; 1550 struct ieee80211_channel *chan; 1551 struct ieee80211_radiotap_header *prthdr = 1552 (struct ieee80211_radiotap_header *)skb->data; 1553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1554 struct ieee80211_hdr *hdr; 1555 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1556 u16 len_rthdr; 1557 int hdrlen; 1558 1559 /* check for not even having the fixed radiotap header part */ 1560 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1561 goto fail; /* too short to be possibly valid */ 1562 1563 /* is it a header version we can trust to find length from? */ 1564 if (unlikely(prthdr->it_version)) 1565 goto fail; /* only version 0 is supported */ 1566 1567 /* then there must be a radiotap header with a length we can use */ 1568 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1569 1570 /* does the skb contain enough to deliver on the alleged length? */ 1571 if (unlikely(skb->len < len_rthdr)) 1572 goto fail; /* skb too short for claimed rt header extent */ 1573 1574 /* 1575 * fix up the pointers accounting for the radiotap 1576 * header still being in there. We are being given 1577 * a precooked IEEE80211 header so no need for 1578 * normal processing 1579 */ 1580 skb_set_mac_header(skb, len_rthdr); 1581 /* 1582 * these are just fixed to the end of the rt area since we 1583 * don't have any better information and at this point, nobody cares 1584 */ 1585 skb_set_network_header(skb, len_rthdr); 1586 skb_set_transport_header(skb, len_rthdr); 1587 1588 if (skb->len < len_rthdr + 2) 1589 goto fail; 1590 1591 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1592 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1593 1594 if (skb->len < len_rthdr + hdrlen) 1595 goto fail; 1596 1597 /* 1598 * Initialize skb->protocol if the injected frame is a data frame 1599 * carrying a rfc1042 header 1600 */ 1601 if (ieee80211_is_data(hdr->frame_control) && 1602 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1603 u8 *payload = (u8 *)hdr + hdrlen; 1604 1605 if (ether_addr_equal(payload, rfc1042_header)) 1606 skb->protocol = cpu_to_be16((payload[6] << 8) | 1607 payload[7]); 1608 } 1609 1610 memset(info, 0, sizeof(*info)); 1611 1612 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1613 IEEE80211_TX_CTL_INJECTED; 1614 1615 /* process and remove the injection radiotap header */ 1616 if (!ieee80211_parse_tx_radiotap(skb)) 1617 goto fail; 1618 1619 rcu_read_lock(); 1620 1621 /* 1622 * We process outgoing injected frames that have a local address 1623 * we handle as though they are non-injected frames. 1624 * This code here isn't entirely correct, the local MAC address 1625 * isn't always enough to find the interface to use; for proper 1626 * VLAN/WDS support we will need a different mechanism (which 1627 * likely isn't going to be monitor interfaces). 1628 */ 1629 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1630 1631 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1632 if (!ieee80211_sdata_running(tmp_sdata)) 1633 continue; 1634 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1635 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1636 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1637 continue; 1638 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1639 sdata = tmp_sdata; 1640 break; 1641 } 1642 } 1643 1644 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1645 if (!chanctx_conf) { 1646 tmp_sdata = rcu_dereference(local->monitor_sdata); 1647 if (tmp_sdata) 1648 chanctx_conf = 1649 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1650 } 1651 1652 if (chanctx_conf) 1653 chan = chanctx_conf->def.chan; 1654 else if (!local->use_chanctx) 1655 chan = local->_oper_chandef.chan; 1656 else 1657 goto fail_rcu; 1658 1659 /* 1660 * Frame injection is not allowed if beaconing is not allowed 1661 * or if we need radar detection. Beaconing is usually not allowed when 1662 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1663 * Passive scan is also used in world regulatory domains where 1664 * your country is not known and as such it should be treated as 1665 * NO TX unless the channel is explicitly allowed in which case 1666 * your current regulatory domain would not have the passive scan 1667 * flag. 1668 * 1669 * Since AP mode uses monitor interfaces to inject/TX management 1670 * frames we can make AP mode the exception to this rule once it 1671 * supports radar detection as its implementation can deal with 1672 * radar detection by itself. We can do that later by adding a 1673 * monitor flag interfaces used for AP support. 1674 */ 1675 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1676 IEEE80211_CHAN_PASSIVE_SCAN))) 1677 goto fail_rcu; 1678 1679 ieee80211_xmit(sdata, skb, chan->band); 1680 rcu_read_unlock(); 1681 1682 return NETDEV_TX_OK; 1683 1684 fail_rcu: 1685 rcu_read_unlock(); 1686 fail: 1687 dev_kfree_skb(skb); 1688 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1689 } 1690 1691 /** 1692 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1693 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1694 * @skb: packet to be sent 1695 * @dev: incoming interface 1696 * 1697 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1698 * not be freed, and caller is responsible for either retrying later or freeing 1699 * skb). 1700 * 1701 * This function takes in an Ethernet header and encapsulates it with suitable 1702 * IEEE 802.11 header based on which interface the packet is coming in. The 1703 * encapsulated packet will then be passed to master interface, wlan#.11, for 1704 * transmission (through low-level driver). 1705 */ 1706 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1707 struct net_device *dev) 1708 { 1709 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1710 struct ieee80211_local *local = sdata->local; 1711 struct ieee80211_tx_info *info; 1712 int head_need; 1713 u16 ethertype, hdrlen, meshhdrlen = 0; 1714 __le16 fc; 1715 struct ieee80211_hdr hdr; 1716 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1717 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1718 const u8 *encaps_data; 1719 int encaps_len, skip_header_bytes; 1720 int nh_pos, h_pos; 1721 struct sta_info *sta = NULL; 1722 bool wme_sta = false, authorized = false, tdls_auth = false; 1723 bool tdls_direct = false; 1724 bool multicast; 1725 u32 info_flags = 0; 1726 u16 info_id = 0; 1727 struct ieee80211_chanctx_conf *chanctx_conf; 1728 struct ieee80211_sub_if_data *ap_sdata; 1729 enum ieee80211_band band; 1730 1731 if (unlikely(skb->len < ETH_HLEN)) 1732 goto fail; 1733 1734 /* convert Ethernet header to proper 802.11 header (based on 1735 * operation mode) */ 1736 ethertype = (skb->data[12] << 8) | skb->data[13]; 1737 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1738 1739 rcu_read_lock(); 1740 1741 switch (sdata->vif.type) { 1742 case NL80211_IFTYPE_AP_VLAN: 1743 sta = rcu_dereference(sdata->u.vlan.sta); 1744 if (sta) { 1745 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1746 /* RA TA DA SA */ 1747 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1748 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1749 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1750 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1751 hdrlen = 30; 1752 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1753 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1754 } 1755 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1756 u.ap); 1757 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1758 if (!chanctx_conf) 1759 goto fail_rcu; 1760 band = chanctx_conf->def.chan->band; 1761 if (sta) 1762 break; 1763 /* fall through */ 1764 case NL80211_IFTYPE_AP: 1765 if (sdata->vif.type == NL80211_IFTYPE_AP) 1766 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1767 if (!chanctx_conf) 1768 goto fail_rcu; 1769 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1770 /* DA BSSID SA */ 1771 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1772 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1773 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1774 hdrlen = 24; 1775 band = chanctx_conf->def.chan->band; 1776 break; 1777 case NL80211_IFTYPE_WDS: 1778 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1779 /* RA TA DA SA */ 1780 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1781 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1782 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1783 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1784 hdrlen = 30; 1785 /* 1786 * This is the exception! WDS style interfaces are prohibited 1787 * when channel contexts are in used so this must be valid 1788 */ 1789 band = local->hw.conf.chandef.chan->band; 1790 break; 1791 #ifdef CONFIG_MAC80211_MESH 1792 case NL80211_IFTYPE_MESH_POINT: 1793 if (!is_multicast_ether_addr(skb->data)) { 1794 struct sta_info *next_hop; 1795 bool mpp_lookup = true; 1796 1797 mpath = mesh_path_lookup(sdata, skb->data); 1798 if (mpath) { 1799 mpp_lookup = false; 1800 next_hop = rcu_dereference(mpath->next_hop); 1801 if (!next_hop || 1802 !(mpath->flags & (MESH_PATH_ACTIVE | 1803 MESH_PATH_RESOLVING))) 1804 mpp_lookup = true; 1805 } 1806 1807 if (mpp_lookup) 1808 mppath = mpp_path_lookup(sdata, skb->data); 1809 1810 if (mppath && mpath) 1811 mesh_path_del(mpath->sdata, mpath->dst); 1812 } 1813 1814 /* 1815 * Use address extension if it is a packet from 1816 * another interface or if we know the destination 1817 * is being proxied by a portal (i.e. portal address 1818 * differs from proxied address) 1819 */ 1820 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1821 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1822 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1823 skb->data, skb->data + ETH_ALEN); 1824 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1825 NULL, NULL); 1826 } else { 1827 /* DS -> MBSS (802.11-2012 13.11.3.3). 1828 * For unicast with unknown forwarding information, 1829 * destination might be in the MBSS or if that fails 1830 * forwarded to another mesh gate. In either case 1831 * resolution will be handled in ieee80211_xmit(), so 1832 * leave the original DA. This also works for mcast */ 1833 const u8 *mesh_da = skb->data; 1834 1835 if (mppath) 1836 mesh_da = mppath->mpp; 1837 else if (mpath) 1838 mesh_da = mpath->dst; 1839 1840 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1841 mesh_da, sdata->vif.addr); 1842 if (is_multicast_ether_addr(mesh_da)) 1843 /* DA TA mSA AE:SA */ 1844 meshhdrlen = ieee80211_new_mesh_header( 1845 sdata, &mesh_hdr, 1846 skb->data + ETH_ALEN, NULL); 1847 else 1848 /* RA TA mDA mSA AE:DA SA */ 1849 meshhdrlen = ieee80211_new_mesh_header( 1850 sdata, &mesh_hdr, skb->data, 1851 skb->data + ETH_ALEN); 1852 1853 } 1854 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1855 if (!chanctx_conf) 1856 goto fail_rcu; 1857 band = chanctx_conf->def.chan->band; 1858 break; 1859 #endif 1860 case NL80211_IFTYPE_STATION: 1861 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1862 bool tdls_peer = false; 1863 1864 sta = sta_info_get(sdata, skb->data); 1865 if (sta) { 1866 authorized = test_sta_flag(sta, 1867 WLAN_STA_AUTHORIZED); 1868 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1869 tdls_peer = test_sta_flag(sta, 1870 WLAN_STA_TDLS_PEER); 1871 tdls_auth = test_sta_flag(sta, 1872 WLAN_STA_TDLS_PEER_AUTH); 1873 } 1874 1875 /* 1876 * If the TDLS link is enabled, send everything 1877 * directly. Otherwise, allow TDLS setup frames 1878 * to be transmitted indirectly. 1879 */ 1880 tdls_direct = tdls_peer && (tdls_auth || 1881 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1882 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1883 } 1884 1885 if (tdls_direct) { 1886 /* link during setup - throw out frames to peer */ 1887 if (!tdls_auth) 1888 goto fail_rcu; 1889 1890 /* DA SA BSSID */ 1891 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1892 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1893 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1894 hdrlen = 24; 1895 } else if (sdata->u.mgd.use_4addr && 1896 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1897 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1898 IEEE80211_FCTL_TODS); 1899 /* RA TA DA SA */ 1900 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1901 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1902 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1903 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1904 hdrlen = 30; 1905 } else { 1906 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1907 /* BSSID SA DA */ 1908 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1909 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1910 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1911 hdrlen = 24; 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 case NL80211_IFTYPE_ADHOC: 1919 /* DA SA BSSID */ 1920 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1921 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1922 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1923 hdrlen = 24; 1924 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1925 if (!chanctx_conf) 1926 goto fail_rcu; 1927 band = chanctx_conf->def.chan->band; 1928 break; 1929 default: 1930 goto fail_rcu; 1931 } 1932 1933 /* 1934 * There's no need to try to look up the destination 1935 * if it is a multicast address (which can only happen 1936 * in AP mode) 1937 */ 1938 multicast = is_multicast_ether_addr(hdr.addr1); 1939 if (!multicast) { 1940 sta = sta_info_get(sdata, hdr.addr1); 1941 if (sta) { 1942 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1943 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1944 } 1945 } 1946 1947 /* For mesh, the use of the QoS header is mandatory */ 1948 if (ieee80211_vif_is_mesh(&sdata->vif)) 1949 wme_sta = true; 1950 1951 /* receiver and we are QoS enabled, use a QoS type frame */ 1952 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1953 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1954 hdrlen += 2; 1955 } 1956 1957 /* 1958 * Drop unicast frames to unauthorised stations unless they are 1959 * EAPOL frames from the local station. 1960 */ 1961 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1962 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1963 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1964 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1966 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 1967 dev->name, hdr.addr1); 1968 #endif 1969 1970 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1971 1972 goto fail_rcu; 1973 } 1974 1975 if (unlikely(!multicast && skb->sk && 1976 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1977 struct sk_buff *orig_skb = skb; 1978 1979 skb = skb_clone(skb, GFP_ATOMIC); 1980 if (skb) { 1981 unsigned long flags; 1982 int id; 1983 1984 spin_lock_irqsave(&local->ack_status_lock, flags); 1985 id = idr_alloc(&local->ack_status_frames, orig_skb, 1986 1, 0x10000, GFP_ATOMIC); 1987 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1988 1989 if (id >= 0) { 1990 info_id = id; 1991 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1992 } else if (skb_shared(skb)) { 1993 kfree_skb(orig_skb); 1994 } else { 1995 kfree_skb(skb); 1996 skb = orig_skb; 1997 } 1998 } else { 1999 /* couldn't clone -- lose tx status ... */ 2000 skb = orig_skb; 2001 } 2002 } 2003 2004 /* 2005 * If the skb is shared we need to obtain our own copy. 2006 */ 2007 if (skb_shared(skb)) { 2008 struct sk_buff *tmp_skb = skb; 2009 2010 /* can't happen -- skb is a clone if info_id != 0 */ 2011 WARN_ON(info_id); 2012 2013 skb = skb_clone(skb, GFP_ATOMIC); 2014 kfree_skb(tmp_skb); 2015 2016 if (!skb) 2017 goto fail_rcu; 2018 } 2019 2020 hdr.frame_control = fc; 2021 hdr.duration_id = 0; 2022 hdr.seq_ctrl = 0; 2023 2024 skip_header_bytes = ETH_HLEN; 2025 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2026 encaps_data = bridge_tunnel_header; 2027 encaps_len = sizeof(bridge_tunnel_header); 2028 skip_header_bytes -= 2; 2029 } else if (ethertype >= ETH_P_802_3_MIN) { 2030 encaps_data = rfc1042_header; 2031 encaps_len = sizeof(rfc1042_header); 2032 skip_header_bytes -= 2; 2033 } else { 2034 encaps_data = NULL; 2035 encaps_len = 0; 2036 } 2037 2038 nh_pos = skb_network_header(skb) - skb->data; 2039 h_pos = skb_transport_header(skb) - skb->data; 2040 2041 skb_pull(skb, skip_header_bytes); 2042 nh_pos -= skip_header_bytes; 2043 h_pos -= skip_header_bytes; 2044 2045 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2046 2047 /* 2048 * So we need to modify the skb header and hence need a copy of 2049 * that. The head_need variable above doesn't, so far, include 2050 * the needed header space that we don't need right away. If we 2051 * can, then we don't reallocate right now but only after the 2052 * frame arrives at the master device (if it does...) 2053 * 2054 * If we cannot, however, then we will reallocate to include all 2055 * the ever needed space. Also, if we need to reallocate it anyway, 2056 * make it big enough for everything we may ever need. 2057 */ 2058 2059 if (head_need > 0 || skb_cloned(skb)) { 2060 head_need += IEEE80211_ENCRYPT_HEADROOM; 2061 head_need += local->tx_headroom; 2062 head_need = max_t(int, 0, head_need); 2063 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2064 ieee80211_free_txskb(&local->hw, skb); 2065 skb = NULL; 2066 goto fail_rcu; 2067 } 2068 } 2069 2070 if (encaps_data) { 2071 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2072 nh_pos += encaps_len; 2073 h_pos += encaps_len; 2074 } 2075 2076 #ifdef CONFIG_MAC80211_MESH 2077 if (meshhdrlen > 0) { 2078 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2079 nh_pos += meshhdrlen; 2080 h_pos += meshhdrlen; 2081 } 2082 #endif 2083 2084 if (ieee80211_is_data_qos(fc)) { 2085 __le16 *qos_control; 2086 2087 qos_control = (__le16*) skb_push(skb, 2); 2088 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2089 /* 2090 * Maybe we could actually set some fields here, for now just 2091 * initialise to zero to indicate no special operation. 2092 */ 2093 *qos_control = 0; 2094 } else 2095 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2096 2097 nh_pos += hdrlen; 2098 h_pos += hdrlen; 2099 2100 dev->stats.tx_packets++; 2101 dev->stats.tx_bytes += skb->len; 2102 2103 /* Update skb pointers to various headers since this modified frame 2104 * is going to go through Linux networking code that may potentially 2105 * need things like pointer to IP header. */ 2106 skb_set_mac_header(skb, 0); 2107 skb_set_network_header(skb, nh_pos); 2108 skb_set_transport_header(skb, h_pos); 2109 2110 info = IEEE80211_SKB_CB(skb); 2111 memset(info, 0, sizeof(*info)); 2112 2113 dev->trans_start = jiffies; 2114 2115 info->flags = info_flags; 2116 info->ack_frame_id = info_id; 2117 2118 ieee80211_xmit(sdata, skb, band); 2119 rcu_read_unlock(); 2120 2121 return NETDEV_TX_OK; 2122 2123 fail_rcu: 2124 rcu_read_unlock(); 2125 fail: 2126 dev_kfree_skb(skb); 2127 return NETDEV_TX_OK; 2128 } 2129 2130 2131 /* 2132 * ieee80211_clear_tx_pending may not be called in a context where 2133 * it is possible that it packets could come in again. 2134 */ 2135 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2136 { 2137 struct sk_buff *skb; 2138 int i; 2139 2140 for (i = 0; i < local->hw.queues; i++) { 2141 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2142 ieee80211_free_txskb(&local->hw, skb); 2143 } 2144 } 2145 2146 /* 2147 * Returns false if the frame couldn't be transmitted but was queued instead, 2148 * which in this case means re-queued -- take as an indication to stop sending 2149 * more pending frames. 2150 */ 2151 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2152 struct sk_buff *skb) 2153 { 2154 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2155 struct ieee80211_sub_if_data *sdata; 2156 struct sta_info *sta; 2157 struct ieee80211_hdr *hdr; 2158 bool result; 2159 struct ieee80211_chanctx_conf *chanctx_conf; 2160 2161 sdata = vif_to_sdata(info->control.vif); 2162 2163 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2164 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2165 if (unlikely(!chanctx_conf)) { 2166 dev_kfree_skb(skb); 2167 return true; 2168 } 2169 result = ieee80211_tx(sdata, skb, true, 2170 chanctx_conf->def.chan->band); 2171 } else { 2172 struct sk_buff_head skbs; 2173 2174 __skb_queue_head_init(&skbs); 2175 __skb_queue_tail(&skbs, skb); 2176 2177 hdr = (struct ieee80211_hdr *)skb->data; 2178 sta = sta_info_get(sdata, hdr->addr1); 2179 2180 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2181 } 2182 2183 return result; 2184 } 2185 2186 /* 2187 * Transmit all pending packets. Called from tasklet. 2188 */ 2189 void ieee80211_tx_pending(unsigned long data) 2190 { 2191 struct ieee80211_local *local = (struct ieee80211_local *)data; 2192 unsigned long flags; 2193 int i; 2194 bool txok; 2195 2196 rcu_read_lock(); 2197 2198 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2199 for (i = 0; i < local->hw.queues; i++) { 2200 /* 2201 * If queue is stopped by something other than due to pending 2202 * frames, or we have no pending frames, proceed to next queue. 2203 */ 2204 if (local->queue_stop_reasons[i] || 2205 skb_queue_empty(&local->pending[i])) 2206 continue; 2207 2208 while (!skb_queue_empty(&local->pending[i])) { 2209 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2211 2212 if (WARN_ON(!info->control.vif)) { 2213 ieee80211_free_txskb(&local->hw, skb); 2214 continue; 2215 } 2216 2217 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2218 flags); 2219 2220 txok = ieee80211_tx_pending_skb(local, skb); 2221 spin_lock_irqsave(&local->queue_stop_reason_lock, 2222 flags); 2223 if (!txok) 2224 break; 2225 } 2226 2227 if (skb_queue_empty(&local->pending[i])) 2228 ieee80211_propagate_queue_wake(local, i); 2229 } 2230 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2231 2232 rcu_read_unlock(); 2233 } 2234 2235 /* functions for drivers to get certain frames */ 2236 2237 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2238 struct ps_data *ps, struct sk_buff *skb) 2239 { 2240 u8 *pos, *tim; 2241 int aid0 = 0; 2242 int i, have_bits = 0, n1, n2; 2243 2244 /* Generate bitmap for TIM only if there are any STAs in power save 2245 * mode. */ 2246 if (atomic_read(&ps->num_sta_ps) > 0) 2247 /* in the hope that this is faster than 2248 * checking byte-for-byte */ 2249 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2250 IEEE80211_MAX_AID+1); 2251 2252 if (ps->dtim_count == 0) 2253 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2254 else 2255 ps->dtim_count--; 2256 2257 tim = pos = (u8 *) skb_put(skb, 6); 2258 *pos++ = WLAN_EID_TIM; 2259 *pos++ = 4; 2260 *pos++ = ps->dtim_count; 2261 *pos++ = sdata->vif.bss_conf.dtim_period; 2262 2263 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2264 aid0 = 1; 2265 2266 ps->dtim_bc_mc = aid0 == 1; 2267 2268 if (have_bits) { 2269 /* Find largest even number N1 so that bits numbered 1 through 2270 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2271 * (N2 + 1) x 8 through 2007 are 0. */ 2272 n1 = 0; 2273 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2274 if (ps->tim[i]) { 2275 n1 = i & 0xfe; 2276 break; 2277 } 2278 } 2279 n2 = n1; 2280 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2281 if (ps->tim[i]) { 2282 n2 = i; 2283 break; 2284 } 2285 } 2286 2287 /* Bitmap control */ 2288 *pos++ = n1 | aid0; 2289 /* Part Virt Bitmap */ 2290 skb_put(skb, n2 - n1); 2291 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2292 2293 tim[1] = n2 - n1 + 4; 2294 } else { 2295 *pos++ = aid0; /* Bitmap control */ 2296 *pos++ = 0; /* Part Virt Bitmap */ 2297 } 2298 } 2299 2300 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2301 struct ps_data *ps, struct sk_buff *skb) 2302 { 2303 struct ieee80211_local *local = sdata->local; 2304 2305 /* 2306 * Not very nice, but we want to allow the driver to call 2307 * ieee80211_beacon_get() as a response to the set_tim() 2308 * callback. That, however, is already invoked under the 2309 * sta_lock to guarantee consistent and race-free update 2310 * of the tim bitmap in mac80211 and the driver. 2311 */ 2312 if (local->tim_in_locked_section) { 2313 __ieee80211_beacon_add_tim(sdata, ps, skb); 2314 } else { 2315 spin_lock_bh(&local->tim_lock); 2316 __ieee80211_beacon_add_tim(sdata, ps, skb); 2317 spin_unlock_bh(&local->tim_lock); 2318 } 2319 2320 return 0; 2321 } 2322 2323 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2324 struct ieee80211_vif *vif, 2325 u16 *tim_offset, u16 *tim_length) 2326 { 2327 struct ieee80211_local *local = hw_to_local(hw); 2328 struct sk_buff *skb = NULL; 2329 struct ieee80211_tx_info *info; 2330 struct ieee80211_sub_if_data *sdata = NULL; 2331 enum ieee80211_band band; 2332 struct ieee80211_tx_rate_control txrc; 2333 struct ieee80211_chanctx_conf *chanctx_conf; 2334 2335 rcu_read_lock(); 2336 2337 sdata = vif_to_sdata(vif); 2338 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2339 2340 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2341 goto out; 2342 2343 if (tim_offset) 2344 *tim_offset = 0; 2345 if (tim_length) 2346 *tim_length = 0; 2347 2348 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2349 struct ieee80211_if_ap *ap = &sdata->u.ap; 2350 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2351 2352 if (beacon) { 2353 /* 2354 * headroom, head length, 2355 * tail length and maximum TIM length 2356 */ 2357 skb = dev_alloc_skb(local->tx_headroom + 2358 beacon->head_len + 2359 beacon->tail_len + 256); 2360 if (!skb) 2361 goto out; 2362 2363 skb_reserve(skb, local->tx_headroom); 2364 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2365 beacon->head_len); 2366 2367 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2368 2369 if (tim_offset) 2370 *tim_offset = beacon->head_len; 2371 if (tim_length) 2372 *tim_length = skb->len - beacon->head_len; 2373 2374 if (beacon->tail) 2375 memcpy(skb_put(skb, beacon->tail_len), 2376 beacon->tail, beacon->tail_len); 2377 } else 2378 goto out; 2379 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2380 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2381 struct ieee80211_hdr *hdr; 2382 struct beacon_data *presp = rcu_dereference(ifibss->presp); 2383 2384 if (!presp) 2385 goto out; 2386 2387 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 2388 if (!skb) 2389 goto out; 2390 skb_reserve(skb, local->tx_headroom); 2391 memcpy(skb_put(skb, presp->head_len), presp->head, 2392 presp->head_len); 2393 2394 hdr = (struct ieee80211_hdr *) skb->data; 2395 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2396 IEEE80211_STYPE_BEACON); 2397 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2398 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2399 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2400 2401 if (!bcn) 2402 goto out; 2403 2404 if (ifmsh->sync_ops) 2405 ifmsh->sync_ops->adjust_tbtt( 2406 sdata); 2407 2408 skb = dev_alloc_skb(local->tx_headroom + 2409 bcn->head_len + 2410 256 + /* TIM IE */ 2411 bcn->tail_len); 2412 if (!skb) 2413 goto out; 2414 skb_reserve(skb, local->tx_headroom); 2415 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2416 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2417 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2418 } else { 2419 WARN_ON(1); 2420 goto out; 2421 } 2422 2423 band = chanctx_conf->def.chan->band; 2424 2425 info = IEEE80211_SKB_CB(skb); 2426 2427 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2428 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2429 info->band = band; 2430 2431 memset(&txrc, 0, sizeof(txrc)); 2432 txrc.hw = hw; 2433 txrc.sband = local->hw.wiphy->bands[band]; 2434 txrc.bss_conf = &sdata->vif.bss_conf; 2435 txrc.skb = skb; 2436 txrc.reported_rate.idx = -1; 2437 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2438 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2439 txrc.max_rate_idx = -1; 2440 else 2441 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2442 txrc.bss = true; 2443 rate_control_get_rate(sdata, NULL, &txrc); 2444 2445 info->control.vif = vif; 2446 2447 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2448 IEEE80211_TX_CTL_ASSIGN_SEQ | 2449 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2450 out: 2451 rcu_read_unlock(); 2452 return skb; 2453 } 2454 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2455 2456 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2457 struct ieee80211_vif *vif) 2458 { 2459 struct ieee80211_if_ap *ap = NULL; 2460 struct sk_buff *skb = NULL; 2461 struct probe_resp *presp = NULL; 2462 struct ieee80211_hdr *hdr; 2463 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2464 2465 if (sdata->vif.type != NL80211_IFTYPE_AP) 2466 return NULL; 2467 2468 rcu_read_lock(); 2469 2470 ap = &sdata->u.ap; 2471 presp = rcu_dereference(ap->probe_resp); 2472 if (!presp) 2473 goto out; 2474 2475 skb = dev_alloc_skb(presp->len); 2476 if (!skb) 2477 goto out; 2478 2479 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2480 2481 hdr = (struct ieee80211_hdr *) skb->data; 2482 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2483 2484 out: 2485 rcu_read_unlock(); 2486 return skb; 2487 } 2488 EXPORT_SYMBOL(ieee80211_proberesp_get); 2489 2490 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2491 struct ieee80211_vif *vif) 2492 { 2493 struct ieee80211_sub_if_data *sdata; 2494 struct ieee80211_if_managed *ifmgd; 2495 struct ieee80211_pspoll *pspoll; 2496 struct ieee80211_local *local; 2497 struct sk_buff *skb; 2498 2499 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2500 return NULL; 2501 2502 sdata = vif_to_sdata(vif); 2503 ifmgd = &sdata->u.mgd; 2504 local = sdata->local; 2505 2506 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2507 if (!skb) 2508 return NULL; 2509 2510 skb_reserve(skb, local->hw.extra_tx_headroom); 2511 2512 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2513 memset(pspoll, 0, sizeof(*pspoll)); 2514 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2515 IEEE80211_STYPE_PSPOLL); 2516 pspoll->aid = cpu_to_le16(ifmgd->aid); 2517 2518 /* aid in PS-Poll has its two MSBs each set to 1 */ 2519 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2520 2521 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2522 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2523 2524 return skb; 2525 } 2526 EXPORT_SYMBOL(ieee80211_pspoll_get); 2527 2528 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2529 struct ieee80211_vif *vif) 2530 { 2531 struct ieee80211_hdr_3addr *nullfunc; 2532 struct ieee80211_sub_if_data *sdata; 2533 struct ieee80211_if_managed *ifmgd; 2534 struct ieee80211_local *local; 2535 struct sk_buff *skb; 2536 2537 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2538 return NULL; 2539 2540 sdata = vif_to_sdata(vif); 2541 ifmgd = &sdata->u.mgd; 2542 local = sdata->local; 2543 2544 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2545 if (!skb) 2546 return NULL; 2547 2548 skb_reserve(skb, local->hw.extra_tx_headroom); 2549 2550 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2551 sizeof(*nullfunc)); 2552 memset(nullfunc, 0, sizeof(*nullfunc)); 2553 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2554 IEEE80211_STYPE_NULLFUNC | 2555 IEEE80211_FCTL_TODS); 2556 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2557 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2558 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2559 2560 return skb; 2561 } 2562 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2563 2564 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2565 struct ieee80211_vif *vif, 2566 const u8 *ssid, size_t ssid_len, 2567 size_t tailroom) 2568 { 2569 struct ieee80211_sub_if_data *sdata; 2570 struct ieee80211_local *local; 2571 struct ieee80211_hdr_3addr *hdr; 2572 struct sk_buff *skb; 2573 size_t ie_ssid_len; 2574 u8 *pos; 2575 2576 sdata = vif_to_sdata(vif); 2577 local = sdata->local; 2578 ie_ssid_len = 2 + ssid_len; 2579 2580 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2581 ie_ssid_len + tailroom); 2582 if (!skb) 2583 return NULL; 2584 2585 skb_reserve(skb, local->hw.extra_tx_headroom); 2586 2587 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2588 memset(hdr, 0, sizeof(*hdr)); 2589 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2590 IEEE80211_STYPE_PROBE_REQ); 2591 eth_broadcast_addr(hdr->addr1); 2592 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2593 eth_broadcast_addr(hdr->addr3); 2594 2595 pos = skb_put(skb, ie_ssid_len); 2596 *pos++ = WLAN_EID_SSID; 2597 *pos++ = ssid_len; 2598 if (ssid_len) 2599 memcpy(pos, ssid, ssid_len); 2600 pos += ssid_len; 2601 2602 return skb; 2603 } 2604 EXPORT_SYMBOL(ieee80211_probereq_get); 2605 2606 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2607 const void *frame, size_t frame_len, 2608 const struct ieee80211_tx_info *frame_txctl, 2609 struct ieee80211_rts *rts) 2610 { 2611 const struct ieee80211_hdr *hdr = frame; 2612 2613 rts->frame_control = 2614 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2615 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2616 frame_txctl); 2617 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2618 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2619 } 2620 EXPORT_SYMBOL(ieee80211_rts_get); 2621 2622 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2623 const void *frame, size_t frame_len, 2624 const struct ieee80211_tx_info *frame_txctl, 2625 struct ieee80211_cts *cts) 2626 { 2627 const struct ieee80211_hdr *hdr = frame; 2628 2629 cts->frame_control = 2630 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2631 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2632 frame_len, frame_txctl); 2633 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2634 } 2635 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2636 2637 struct sk_buff * 2638 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2639 struct ieee80211_vif *vif) 2640 { 2641 struct ieee80211_local *local = hw_to_local(hw); 2642 struct sk_buff *skb = NULL; 2643 struct ieee80211_tx_data tx; 2644 struct ieee80211_sub_if_data *sdata; 2645 struct ps_data *ps; 2646 struct ieee80211_tx_info *info; 2647 struct ieee80211_chanctx_conf *chanctx_conf; 2648 2649 sdata = vif_to_sdata(vif); 2650 2651 rcu_read_lock(); 2652 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2653 2654 if (!chanctx_conf) 2655 goto out; 2656 2657 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2658 struct beacon_data *beacon = 2659 rcu_dereference(sdata->u.ap.beacon); 2660 2661 if (!beacon || !beacon->head) 2662 goto out; 2663 2664 ps = &sdata->u.ap.ps; 2665 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2666 ps = &sdata->u.mesh.ps; 2667 } else { 2668 goto out; 2669 } 2670 2671 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2672 goto out; /* send buffered bc/mc only after DTIM beacon */ 2673 2674 while (1) { 2675 skb = skb_dequeue(&ps->bc_buf); 2676 if (!skb) 2677 goto out; 2678 local->total_ps_buffered--; 2679 2680 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2681 struct ieee80211_hdr *hdr = 2682 (struct ieee80211_hdr *) skb->data; 2683 /* more buffered multicast/broadcast frames ==> set 2684 * MoreData flag in IEEE 802.11 header to inform PS 2685 * STAs */ 2686 hdr->frame_control |= 2687 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2688 } 2689 2690 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2691 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2692 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2693 break; 2694 dev_kfree_skb_any(skb); 2695 } 2696 2697 info = IEEE80211_SKB_CB(skb); 2698 2699 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2700 info->band = chanctx_conf->def.chan->band; 2701 2702 if (invoke_tx_handlers(&tx)) 2703 skb = NULL; 2704 out: 2705 rcu_read_unlock(); 2706 2707 return skb; 2708 } 2709 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2710 2711 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2712 struct sk_buff *skb, int tid, 2713 enum ieee80211_band band) 2714 { 2715 int ac = ieee802_1d_to_ac[tid & 7]; 2716 2717 skb_set_mac_header(skb, 0); 2718 skb_set_network_header(skb, 0); 2719 skb_set_transport_header(skb, 0); 2720 2721 skb_set_queue_mapping(skb, ac); 2722 skb->priority = tid; 2723 2724 skb->dev = sdata->dev; 2725 2726 /* 2727 * The other path calling ieee80211_xmit is from the tasklet, 2728 * and while we can handle concurrent transmissions locking 2729 * requirements are that we do not come into tx with bhs on. 2730 */ 2731 local_bh_disable(); 2732 ieee80211_xmit(sdata, skb, band); 2733 local_bh_enable(); 2734 } 2735