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 local->queue_stop_reasons[q] & 1236 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL))) { 1237 /* 1238 * Drop off-channel frames if queues are stopped 1239 * for any reason other than off-channel 1240 * operation. Never queue them. 1241 */ 1242 spin_unlock_irqrestore( 1243 &local->queue_stop_reason_lock, flags); 1244 ieee80211_purge_tx_queue(&local->hw, skbs); 1245 return true; 1246 } 1247 1248 /* 1249 * Since queue is stopped, queue up frames for later 1250 * transmission from the tx-pending tasklet when the 1251 * queue is woken again. 1252 */ 1253 if (txpending) 1254 skb_queue_splice_init(skbs, &local->pending[q]); 1255 else 1256 skb_queue_splice_tail_init(skbs, 1257 &local->pending[q]); 1258 1259 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1260 flags); 1261 return false; 1262 } 1263 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1264 1265 info->control.vif = vif; 1266 control.sta = sta; 1267 1268 __skb_unlink(skb, skbs); 1269 drv_tx(local, &control, skb); 1270 } 1271 1272 return true; 1273 } 1274 1275 /* 1276 * Returns false if the frame couldn't be transmitted but was queued instead. 1277 */ 1278 static bool __ieee80211_tx(struct ieee80211_local *local, 1279 struct sk_buff_head *skbs, int led_len, 1280 struct sta_info *sta, bool txpending) 1281 { 1282 struct ieee80211_tx_info *info; 1283 struct ieee80211_sub_if_data *sdata; 1284 struct ieee80211_vif *vif; 1285 struct ieee80211_sta *pubsta; 1286 struct sk_buff *skb; 1287 bool result = true; 1288 __le16 fc; 1289 1290 if (WARN_ON(skb_queue_empty(skbs))) 1291 return true; 1292 1293 skb = skb_peek(skbs); 1294 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1295 info = IEEE80211_SKB_CB(skb); 1296 sdata = vif_to_sdata(info->control.vif); 1297 if (sta && !sta->uploaded) 1298 sta = NULL; 1299 1300 if (sta) 1301 pubsta = &sta->sta; 1302 else 1303 pubsta = NULL; 1304 1305 switch (sdata->vif.type) { 1306 case NL80211_IFTYPE_MONITOR: 1307 sdata = rcu_dereference(local->monitor_sdata); 1308 if (sdata) { 1309 vif = &sdata->vif; 1310 info->hw_queue = 1311 vif->hw_queue[skb_get_queue_mapping(skb)]; 1312 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1313 dev_kfree_skb(skb); 1314 return true; 1315 } else 1316 vif = NULL; 1317 break; 1318 case NL80211_IFTYPE_AP_VLAN: 1319 sdata = container_of(sdata->bss, 1320 struct ieee80211_sub_if_data, u.ap); 1321 /* fall through */ 1322 default: 1323 vif = &sdata->vif; 1324 break; 1325 } 1326 1327 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1328 txpending); 1329 1330 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1331 ieee80211_led_tx(local, 1); 1332 1333 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1334 1335 return result; 1336 } 1337 1338 /* 1339 * Invoke TX handlers, return 0 on success and non-zero if the 1340 * frame was dropped or queued. 1341 */ 1342 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1343 { 1344 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1345 ieee80211_tx_result res = TX_DROP; 1346 1347 #define CALL_TXH(txh) \ 1348 do { \ 1349 res = txh(tx); \ 1350 if (res != TX_CONTINUE) \ 1351 goto txh_done; \ 1352 } while (0) 1353 1354 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1355 CALL_TXH(ieee80211_tx_h_check_assoc); 1356 CALL_TXH(ieee80211_tx_h_ps_buf); 1357 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1358 CALL_TXH(ieee80211_tx_h_select_key); 1359 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1360 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1361 1362 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1363 __skb_queue_tail(&tx->skbs, tx->skb); 1364 tx->skb = NULL; 1365 goto txh_done; 1366 } 1367 1368 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1369 CALL_TXH(ieee80211_tx_h_sequence); 1370 CALL_TXH(ieee80211_tx_h_fragment); 1371 /* handlers after fragment must be aware of tx info fragmentation! */ 1372 CALL_TXH(ieee80211_tx_h_stats); 1373 CALL_TXH(ieee80211_tx_h_encrypt); 1374 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1375 CALL_TXH(ieee80211_tx_h_calculate_duration); 1376 #undef CALL_TXH 1377 1378 txh_done: 1379 if (unlikely(res == TX_DROP)) { 1380 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1381 if (tx->skb) 1382 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1383 else 1384 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1385 return -1; 1386 } else if (unlikely(res == TX_QUEUED)) { 1387 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1388 return -1; 1389 } 1390 1391 return 0; 1392 } 1393 1394 /* 1395 * Returns false if the frame couldn't be transmitted but was queued instead. 1396 */ 1397 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1398 struct sk_buff *skb, bool txpending, 1399 enum ieee80211_band band) 1400 { 1401 struct ieee80211_local *local = sdata->local; 1402 struct ieee80211_tx_data tx; 1403 ieee80211_tx_result res_prepare; 1404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1405 bool result = true; 1406 int led_len; 1407 1408 if (unlikely(skb->len < 10)) { 1409 dev_kfree_skb(skb); 1410 return true; 1411 } 1412 1413 /* initialises tx */ 1414 led_len = skb->len; 1415 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1416 1417 if (unlikely(res_prepare == TX_DROP)) { 1418 ieee80211_free_txskb(&local->hw, skb); 1419 return true; 1420 } else if (unlikely(res_prepare == TX_QUEUED)) { 1421 return true; 1422 } 1423 1424 info->band = band; 1425 1426 /* set up hw_queue value early */ 1427 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1428 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1429 info->hw_queue = 1430 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1431 1432 if (!invoke_tx_handlers(&tx)) 1433 result = __ieee80211_tx(local, &tx.skbs, led_len, 1434 tx.sta, txpending); 1435 1436 return result; 1437 } 1438 1439 /* device xmit handlers */ 1440 1441 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1442 struct sk_buff *skb, 1443 int head_need, bool may_encrypt) 1444 { 1445 struct ieee80211_local *local = sdata->local; 1446 int tail_need = 0; 1447 1448 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1449 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1450 tail_need -= skb_tailroom(skb); 1451 tail_need = max_t(int, tail_need, 0); 1452 } 1453 1454 if (skb_cloned(skb)) 1455 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1456 else if (head_need || tail_need) 1457 I802_DEBUG_INC(local->tx_expand_skb_head); 1458 else 1459 return 0; 1460 1461 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1462 wiphy_debug(local->hw.wiphy, 1463 "failed to reallocate TX buffer\n"); 1464 return -ENOMEM; 1465 } 1466 1467 return 0; 1468 } 1469 1470 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1471 enum ieee80211_band band) 1472 { 1473 struct ieee80211_local *local = sdata->local; 1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1476 int headroom; 1477 bool may_encrypt; 1478 1479 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1480 1481 headroom = local->tx_headroom; 1482 if (may_encrypt) 1483 headroom += IEEE80211_ENCRYPT_HEADROOM; 1484 headroom -= skb_headroom(skb); 1485 headroom = max_t(int, 0, headroom); 1486 1487 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1488 ieee80211_free_txskb(&local->hw, skb); 1489 return; 1490 } 1491 1492 hdr = (struct ieee80211_hdr *) skb->data; 1493 info->control.vif = &sdata->vif; 1494 1495 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1496 if (ieee80211_is_data(hdr->frame_control) && 1497 is_unicast_ether_addr(hdr->addr1)) { 1498 if (mesh_nexthop_resolve(sdata, skb)) 1499 return; /* skb queued: don't free */ 1500 } else { 1501 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1502 } 1503 } 1504 1505 ieee80211_set_qos_hdr(sdata, skb); 1506 ieee80211_tx(sdata, skb, false, band); 1507 } 1508 1509 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1510 { 1511 struct ieee80211_radiotap_iterator iterator; 1512 struct ieee80211_radiotap_header *rthdr = 1513 (struct ieee80211_radiotap_header *) skb->data; 1514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1515 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1516 NULL); 1517 u16 txflags; 1518 1519 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1520 IEEE80211_TX_CTL_DONTFRAG; 1521 1522 /* 1523 * for every radiotap entry that is present 1524 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1525 * entries present, or -EINVAL on error) 1526 */ 1527 1528 while (!ret) { 1529 ret = ieee80211_radiotap_iterator_next(&iterator); 1530 1531 if (ret) 1532 continue; 1533 1534 /* see if this argument is something we can use */ 1535 switch (iterator.this_arg_index) { 1536 /* 1537 * You must take care when dereferencing iterator.this_arg 1538 * for multibyte types... the pointer is not aligned. Use 1539 * get_unaligned((type *)iterator.this_arg) to dereference 1540 * iterator.this_arg for type "type" safely on all arches. 1541 */ 1542 case IEEE80211_RADIOTAP_FLAGS: 1543 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1544 /* 1545 * this indicates that the skb we have been 1546 * handed has the 32-bit FCS CRC at the end... 1547 * we should react to that by snipping it off 1548 * because it will be recomputed and added 1549 * on transmission 1550 */ 1551 if (skb->len < (iterator._max_length + FCS_LEN)) 1552 return false; 1553 1554 skb_trim(skb, skb->len - FCS_LEN); 1555 } 1556 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1557 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1558 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1559 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1560 break; 1561 1562 case IEEE80211_RADIOTAP_TX_FLAGS: 1563 txflags = get_unaligned_le16(iterator.this_arg); 1564 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1565 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1566 break; 1567 1568 /* 1569 * Please update the file 1570 * Documentation/networking/mac80211-injection.txt 1571 * when parsing new fields here. 1572 */ 1573 1574 default: 1575 break; 1576 } 1577 } 1578 1579 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1580 return false; 1581 1582 /* 1583 * remove the radiotap header 1584 * iterator->_max_length was sanity-checked against 1585 * skb->len by iterator init 1586 */ 1587 skb_pull(skb, iterator._max_length); 1588 1589 return true; 1590 } 1591 1592 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1593 struct net_device *dev) 1594 { 1595 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1596 struct ieee80211_chanctx_conf *chanctx_conf; 1597 struct ieee80211_channel *chan; 1598 struct ieee80211_radiotap_header *prthdr = 1599 (struct ieee80211_radiotap_header *)skb->data; 1600 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1601 struct ieee80211_hdr *hdr; 1602 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1603 u16 len_rthdr; 1604 int hdrlen; 1605 1606 /* check for not even having the fixed radiotap header part */ 1607 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1608 goto fail; /* too short to be possibly valid */ 1609 1610 /* is it a header version we can trust to find length from? */ 1611 if (unlikely(prthdr->it_version)) 1612 goto fail; /* only version 0 is supported */ 1613 1614 /* then there must be a radiotap header with a length we can use */ 1615 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1616 1617 /* does the skb contain enough to deliver on the alleged length? */ 1618 if (unlikely(skb->len < len_rthdr)) 1619 goto fail; /* skb too short for claimed rt header extent */ 1620 1621 /* 1622 * fix up the pointers accounting for the radiotap 1623 * header still being in there. We are being given 1624 * a precooked IEEE80211 header so no need for 1625 * normal processing 1626 */ 1627 skb_set_mac_header(skb, len_rthdr); 1628 /* 1629 * these are just fixed to the end of the rt area since we 1630 * don't have any better information and at this point, nobody cares 1631 */ 1632 skb_set_network_header(skb, len_rthdr); 1633 skb_set_transport_header(skb, len_rthdr); 1634 1635 if (skb->len < len_rthdr + 2) 1636 goto fail; 1637 1638 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1639 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1640 1641 if (skb->len < len_rthdr + hdrlen) 1642 goto fail; 1643 1644 /* 1645 * Initialize skb->protocol if the injected frame is a data frame 1646 * carrying a rfc1042 header 1647 */ 1648 if (ieee80211_is_data(hdr->frame_control) && 1649 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1650 u8 *payload = (u8 *)hdr + hdrlen; 1651 1652 if (ether_addr_equal(payload, rfc1042_header)) 1653 skb->protocol = cpu_to_be16((payload[6] << 8) | 1654 payload[7]); 1655 } 1656 1657 memset(info, 0, sizeof(*info)); 1658 1659 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1660 IEEE80211_TX_CTL_INJECTED; 1661 1662 /* process and remove the injection radiotap header */ 1663 if (!ieee80211_parse_tx_radiotap(skb)) 1664 goto fail; 1665 1666 rcu_read_lock(); 1667 1668 /* 1669 * We process outgoing injected frames that have a local address 1670 * we handle as though they are non-injected frames. 1671 * This code here isn't entirely correct, the local MAC address 1672 * isn't always enough to find the interface to use; for proper 1673 * VLAN/WDS support we will need a different mechanism (which 1674 * likely isn't going to be monitor interfaces). 1675 */ 1676 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1677 1678 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1679 if (!ieee80211_sdata_running(tmp_sdata)) 1680 continue; 1681 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1682 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1683 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1684 continue; 1685 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1686 sdata = tmp_sdata; 1687 break; 1688 } 1689 } 1690 1691 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1692 if (!chanctx_conf) { 1693 tmp_sdata = rcu_dereference(local->monitor_sdata); 1694 if (tmp_sdata) 1695 chanctx_conf = 1696 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1697 } 1698 1699 if (chanctx_conf) 1700 chan = chanctx_conf->def.chan; 1701 else if (!local->use_chanctx) 1702 chan = local->_oper_channel; 1703 else 1704 goto fail_rcu; 1705 1706 /* 1707 * Frame injection is not allowed if beaconing is not allowed 1708 * or if we need radar detection. Beaconing is usually not allowed when 1709 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1710 * Passive scan is also used in world regulatory domains where 1711 * your country is not known and as such it should be treated as 1712 * NO TX unless the channel is explicitly allowed in which case 1713 * your current regulatory domain would not have the passive scan 1714 * flag. 1715 * 1716 * Since AP mode uses monitor interfaces to inject/TX management 1717 * frames we can make AP mode the exception to this rule once it 1718 * supports radar detection as its implementation can deal with 1719 * radar detection by itself. We can do that later by adding a 1720 * monitor flag interfaces used for AP support. 1721 */ 1722 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1723 IEEE80211_CHAN_PASSIVE_SCAN))) 1724 goto fail_rcu; 1725 1726 ieee80211_xmit(sdata, skb, chan->band); 1727 rcu_read_unlock(); 1728 1729 return NETDEV_TX_OK; 1730 1731 fail_rcu: 1732 rcu_read_unlock(); 1733 fail: 1734 dev_kfree_skb(skb); 1735 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1736 } 1737 1738 /** 1739 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1740 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1741 * @skb: packet to be sent 1742 * @dev: incoming interface 1743 * 1744 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1745 * not be freed, and caller is responsible for either retrying later or freeing 1746 * skb). 1747 * 1748 * This function takes in an Ethernet header and encapsulates it with suitable 1749 * IEEE 802.11 header based on which interface the packet is coming in. The 1750 * encapsulated packet will then be passed to master interface, wlan#.11, for 1751 * transmission (through low-level driver). 1752 */ 1753 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1754 struct net_device *dev) 1755 { 1756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1757 struct ieee80211_local *local = sdata->local; 1758 struct ieee80211_tx_info *info; 1759 int head_need; 1760 u16 ethertype, hdrlen, meshhdrlen = 0; 1761 __le16 fc; 1762 struct ieee80211_hdr hdr; 1763 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1764 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1765 const u8 *encaps_data; 1766 int encaps_len, skip_header_bytes; 1767 int nh_pos, h_pos; 1768 struct sta_info *sta = NULL; 1769 bool wme_sta = false, authorized = false, tdls_auth = false; 1770 bool tdls_direct = false; 1771 bool multicast; 1772 u32 info_flags = 0; 1773 u16 info_id = 0; 1774 struct ieee80211_chanctx_conf *chanctx_conf; 1775 struct ieee80211_sub_if_data *ap_sdata; 1776 enum ieee80211_band band; 1777 1778 if (unlikely(skb->len < ETH_HLEN)) 1779 goto fail; 1780 1781 /* convert Ethernet header to proper 802.11 header (based on 1782 * operation mode) */ 1783 ethertype = (skb->data[12] << 8) | skb->data[13]; 1784 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1785 1786 rcu_read_lock(); 1787 1788 switch (sdata->vif.type) { 1789 case NL80211_IFTYPE_AP_VLAN: 1790 sta = rcu_dereference(sdata->u.vlan.sta); 1791 if (sta) { 1792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1793 /* RA TA DA SA */ 1794 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1795 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1796 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1797 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1798 hdrlen = 30; 1799 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1800 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1801 } 1802 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1803 u.ap); 1804 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1805 if (!chanctx_conf) 1806 goto fail_rcu; 1807 band = chanctx_conf->def.chan->band; 1808 if (sta) 1809 break; 1810 /* fall through */ 1811 case NL80211_IFTYPE_AP: 1812 if (sdata->vif.type == NL80211_IFTYPE_AP) 1813 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1814 if (!chanctx_conf) 1815 goto fail_rcu; 1816 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1817 /* DA BSSID SA */ 1818 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1819 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1820 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1821 hdrlen = 24; 1822 band = chanctx_conf->def.chan->band; 1823 break; 1824 case NL80211_IFTYPE_WDS: 1825 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1826 /* RA TA DA SA */ 1827 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1828 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1829 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1830 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1831 hdrlen = 30; 1832 /* 1833 * This is the exception! WDS style interfaces are prohibited 1834 * when channel contexts are in used so this must be valid 1835 */ 1836 band = local->hw.conf.channel->band; 1837 break; 1838 #ifdef CONFIG_MAC80211_MESH 1839 case NL80211_IFTYPE_MESH_POINT: 1840 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1841 /* Do not send frames with mesh_ttl == 0 */ 1842 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1843 goto fail_rcu; 1844 } 1845 1846 if (!is_multicast_ether_addr(skb->data)) { 1847 mpath = mesh_path_lookup(sdata, skb->data); 1848 if (!mpath) 1849 mppath = mpp_path_lookup(sdata, skb->data); 1850 } 1851 1852 /* 1853 * Use address extension if it is a packet from 1854 * another interface or if we know the destination 1855 * is being proxied by a portal (i.e. portal address 1856 * differs from proxied address) 1857 */ 1858 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1859 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1860 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1861 skb->data, skb->data + ETH_ALEN); 1862 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1863 NULL, NULL); 1864 } else { 1865 /* DS -> MBSS (802.11-2012 13.11.3.3). 1866 * For unicast with unknown forwarding information, 1867 * destination might be in the MBSS or if that fails 1868 * forwarded to another mesh gate. In either case 1869 * resolution will be handled in ieee80211_xmit(), so 1870 * leave the original DA. This also works for mcast */ 1871 const u8 *mesh_da = skb->data; 1872 1873 if (mppath) 1874 mesh_da = mppath->mpp; 1875 else if (mpath) 1876 mesh_da = mpath->dst; 1877 1878 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1879 mesh_da, sdata->vif.addr); 1880 if (is_multicast_ether_addr(mesh_da)) 1881 /* DA TA mSA AE:SA */ 1882 meshhdrlen = ieee80211_new_mesh_header( 1883 sdata, &mesh_hdr, 1884 skb->data + ETH_ALEN, NULL); 1885 else 1886 /* RA TA mDA mSA AE:DA SA */ 1887 meshhdrlen = ieee80211_new_mesh_header( 1888 sdata, &mesh_hdr, skb->data, 1889 skb->data + ETH_ALEN); 1890 1891 } 1892 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1893 if (!chanctx_conf) 1894 goto fail_rcu; 1895 band = chanctx_conf->def.chan->band; 1896 break; 1897 #endif 1898 case NL80211_IFTYPE_STATION: 1899 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1900 bool tdls_peer = false; 1901 1902 sta = sta_info_get(sdata, skb->data); 1903 if (sta) { 1904 authorized = test_sta_flag(sta, 1905 WLAN_STA_AUTHORIZED); 1906 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1907 tdls_peer = test_sta_flag(sta, 1908 WLAN_STA_TDLS_PEER); 1909 tdls_auth = test_sta_flag(sta, 1910 WLAN_STA_TDLS_PEER_AUTH); 1911 } 1912 1913 /* 1914 * If the TDLS link is enabled, send everything 1915 * directly. Otherwise, allow TDLS setup frames 1916 * to be transmitted indirectly. 1917 */ 1918 tdls_direct = tdls_peer && (tdls_auth || 1919 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1920 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1921 } 1922 1923 if (tdls_direct) { 1924 /* link during setup - throw out frames to peer */ 1925 if (!tdls_auth) 1926 goto fail_rcu; 1927 1928 /* DA SA BSSID */ 1929 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1930 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1931 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1932 hdrlen = 24; 1933 } else if (sdata->u.mgd.use_4addr && 1934 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1935 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1936 IEEE80211_FCTL_TODS); 1937 /* RA TA DA SA */ 1938 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1939 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1940 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1941 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1942 hdrlen = 30; 1943 } else { 1944 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1945 /* BSSID SA DA */ 1946 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1947 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1948 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1949 hdrlen = 24; 1950 } 1951 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1952 if (!chanctx_conf) 1953 goto fail_rcu; 1954 band = chanctx_conf->def.chan->band; 1955 break; 1956 case NL80211_IFTYPE_ADHOC: 1957 /* DA SA BSSID */ 1958 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1959 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1960 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1961 hdrlen = 24; 1962 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1963 if (!chanctx_conf) 1964 goto fail_rcu; 1965 band = chanctx_conf->def.chan->band; 1966 break; 1967 default: 1968 goto fail_rcu; 1969 } 1970 1971 /* 1972 * There's no need to try to look up the destination 1973 * if it is a multicast address (which can only happen 1974 * in AP mode) 1975 */ 1976 multicast = is_multicast_ether_addr(hdr.addr1); 1977 if (!multicast) { 1978 sta = sta_info_get(sdata, hdr.addr1); 1979 if (sta) { 1980 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1981 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1982 } 1983 } 1984 1985 /* For mesh, the use of the QoS header is mandatory */ 1986 if (ieee80211_vif_is_mesh(&sdata->vif)) 1987 wme_sta = true; 1988 1989 /* receiver and we are QoS enabled, use a QoS type frame */ 1990 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1991 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1992 hdrlen += 2; 1993 } 1994 1995 /* 1996 * Drop unicast frames to unauthorised stations unless they are 1997 * EAPOL frames from the local station. 1998 */ 1999 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2000 !is_multicast_ether_addr(hdr.addr1) && !authorized && 2001 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2002 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2003 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2004 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2005 dev->name, hdr.addr1); 2006 #endif 2007 2008 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2009 2010 goto fail_rcu; 2011 } 2012 2013 if (unlikely(!multicast && skb->sk && 2014 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2015 struct sk_buff *orig_skb = skb; 2016 2017 skb = skb_clone(skb, GFP_ATOMIC); 2018 if (skb) { 2019 unsigned long flags; 2020 int id, r; 2021 2022 spin_lock_irqsave(&local->ack_status_lock, flags); 2023 r = idr_get_new_above(&local->ack_status_frames, 2024 orig_skb, 1, &id); 2025 if (r == -EAGAIN) { 2026 idr_pre_get(&local->ack_status_frames, 2027 GFP_ATOMIC); 2028 r = idr_get_new_above(&local->ack_status_frames, 2029 orig_skb, 1, &id); 2030 } 2031 if (WARN_ON(!id) || id > 0xffff) { 2032 idr_remove(&local->ack_status_frames, id); 2033 r = -ERANGE; 2034 } 2035 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2036 2037 if (!r) { 2038 info_id = id; 2039 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2040 } else if (skb_shared(skb)) { 2041 kfree_skb(orig_skb); 2042 } else { 2043 kfree_skb(skb); 2044 skb = orig_skb; 2045 } 2046 } else { 2047 /* couldn't clone -- lose tx status ... */ 2048 skb = orig_skb; 2049 } 2050 } 2051 2052 /* 2053 * If the skb is shared we need to obtain our own copy. 2054 */ 2055 if (skb_shared(skb)) { 2056 struct sk_buff *tmp_skb = skb; 2057 2058 /* can't happen -- skb is a clone if info_id != 0 */ 2059 WARN_ON(info_id); 2060 2061 skb = skb_clone(skb, GFP_ATOMIC); 2062 kfree_skb(tmp_skb); 2063 2064 if (!skb) 2065 goto fail_rcu; 2066 } 2067 2068 hdr.frame_control = fc; 2069 hdr.duration_id = 0; 2070 hdr.seq_ctrl = 0; 2071 2072 skip_header_bytes = ETH_HLEN; 2073 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2074 encaps_data = bridge_tunnel_header; 2075 encaps_len = sizeof(bridge_tunnel_header); 2076 skip_header_bytes -= 2; 2077 } else if (ethertype >= 0x600) { 2078 encaps_data = rfc1042_header; 2079 encaps_len = sizeof(rfc1042_header); 2080 skip_header_bytes -= 2; 2081 } else { 2082 encaps_data = NULL; 2083 encaps_len = 0; 2084 } 2085 2086 nh_pos = skb_network_header(skb) - skb->data; 2087 h_pos = skb_transport_header(skb) - skb->data; 2088 2089 skb_pull(skb, skip_header_bytes); 2090 nh_pos -= skip_header_bytes; 2091 h_pos -= skip_header_bytes; 2092 2093 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2094 2095 /* 2096 * So we need to modify the skb header and hence need a copy of 2097 * that. The head_need variable above doesn't, so far, include 2098 * the needed header space that we don't need right away. If we 2099 * can, then we don't reallocate right now but only after the 2100 * frame arrives at the master device (if it does...) 2101 * 2102 * If we cannot, however, then we will reallocate to include all 2103 * the ever needed space. Also, if we need to reallocate it anyway, 2104 * make it big enough for everything we may ever need. 2105 */ 2106 2107 if (head_need > 0 || skb_cloned(skb)) { 2108 head_need += IEEE80211_ENCRYPT_HEADROOM; 2109 head_need += local->tx_headroom; 2110 head_need = max_t(int, 0, head_need); 2111 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2112 ieee80211_free_txskb(&local->hw, skb); 2113 skb = NULL; 2114 goto fail_rcu; 2115 } 2116 } 2117 2118 if (encaps_data) { 2119 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2120 nh_pos += encaps_len; 2121 h_pos += encaps_len; 2122 } 2123 2124 #ifdef CONFIG_MAC80211_MESH 2125 if (meshhdrlen > 0) { 2126 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2127 nh_pos += meshhdrlen; 2128 h_pos += meshhdrlen; 2129 } 2130 #endif 2131 2132 if (ieee80211_is_data_qos(fc)) { 2133 __le16 *qos_control; 2134 2135 qos_control = (__le16*) skb_push(skb, 2); 2136 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2137 /* 2138 * Maybe we could actually set some fields here, for now just 2139 * initialise to zero to indicate no special operation. 2140 */ 2141 *qos_control = 0; 2142 } else 2143 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2144 2145 nh_pos += hdrlen; 2146 h_pos += hdrlen; 2147 2148 dev->stats.tx_packets++; 2149 dev->stats.tx_bytes += skb->len; 2150 2151 /* Update skb pointers to various headers since this modified frame 2152 * is going to go through Linux networking code that may potentially 2153 * need things like pointer to IP header. */ 2154 skb_set_mac_header(skb, 0); 2155 skb_set_network_header(skb, nh_pos); 2156 skb_set_transport_header(skb, h_pos); 2157 2158 info = IEEE80211_SKB_CB(skb); 2159 memset(info, 0, sizeof(*info)); 2160 2161 dev->trans_start = jiffies; 2162 2163 info->flags = info_flags; 2164 info->ack_frame_id = info_id; 2165 2166 ieee80211_xmit(sdata, skb, band); 2167 rcu_read_unlock(); 2168 2169 return NETDEV_TX_OK; 2170 2171 fail_rcu: 2172 rcu_read_unlock(); 2173 fail: 2174 dev_kfree_skb(skb); 2175 return NETDEV_TX_OK; 2176 } 2177 2178 2179 /* 2180 * ieee80211_clear_tx_pending may not be called in a context where 2181 * it is possible that it packets could come in again. 2182 */ 2183 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2184 { 2185 struct sk_buff *skb; 2186 int i; 2187 2188 for (i = 0; i < local->hw.queues; i++) { 2189 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2190 ieee80211_free_txskb(&local->hw, skb); 2191 } 2192 } 2193 2194 /* 2195 * Returns false if the frame couldn't be transmitted but was queued instead, 2196 * which in this case means re-queued -- take as an indication to stop sending 2197 * more pending frames. 2198 */ 2199 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2200 struct sk_buff *skb) 2201 { 2202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2203 struct ieee80211_sub_if_data *sdata; 2204 struct sta_info *sta; 2205 struct ieee80211_hdr *hdr; 2206 bool result; 2207 struct ieee80211_chanctx_conf *chanctx_conf; 2208 2209 sdata = vif_to_sdata(info->control.vif); 2210 2211 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2212 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2213 if (unlikely(!chanctx_conf)) { 2214 dev_kfree_skb(skb); 2215 return true; 2216 } 2217 result = ieee80211_tx(sdata, skb, true, 2218 chanctx_conf->def.chan->band); 2219 } else { 2220 struct sk_buff_head skbs; 2221 2222 __skb_queue_head_init(&skbs); 2223 __skb_queue_tail(&skbs, skb); 2224 2225 hdr = (struct ieee80211_hdr *)skb->data; 2226 sta = sta_info_get(sdata, hdr->addr1); 2227 2228 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2229 } 2230 2231 return result; 2232 } 2233 2234 /* 2235 * Transmit all pending packets. Called from tasklet. 2236 */ 2237 void ieee80211_tx_pending(unsigned long data) 2238 { 2239 struct ieee80211_local *local = (struct ieee80211_local *)data; 2240 unsigned long flags; 2241 int i; 2242 bool txok; 2243 2244 rcu_read_lock(); 2245 2246 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2247 for (i = 0; i < local->hw.queues; i++) { 2248 /* 2249 * If queue is stopped by something other than due to pending 2250 * frames, or we have no pending frames, proceed to next queue. 2251 */ 2252 if (local->queue_stop_reasons[i] || 2253 skb_queue_empty(&local->pending[i])) 2254 continue; 2255 2256 while (!skb_queue_empty(&local->pending[i])) { 2257 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2259 2260 if (WARN_ON(!info->control.vif)) { 2261 ieee80211_free_txskb(&local->hw, skb); 2262 continue; 2263 } 2264 2265 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2266 flags); 2267 2268 txok = ieee80211_tx_pending_skb(local, skb); 2269 spin_lock_irqsave(&local->queue_stop_reason_lock, 2270 flags); 2271 if (!txok) 2272 break; 2273 } 2274 2275 if (skb_queue_empty(&local->pending[i])) 2276 ieee80211_propagate_queue_wake(local, i); 2277 } 2278 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2279 2280 rcu_read_unlock(); 2281 } 2282 2283 /* functions for drivers to get certain frames */ 2284 2285 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2286 struct ps_data *ps, struct sk_buff *skb) 2287 { 2288 u8 *pos, *tim; 2289 int aid0 = 0; 2290 int i, have_bits = 0, n1, n2; 2291 2292 /* Generate bitmap for TIM only if there are any STAs in power save 2293 * mode. */ 2294 if (atomic_read(&ps->num_sta_ps) > 0) 2295 /* in the hope that this is faster than 2296 * checking byte-for-byte */ 2297 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2298 IEEE80211_MAX_AID+1); 2299 2300 if (ps->dtim_count == 0) 2301 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2302 else 2303 ps->dtim_count--; 2304 2305 tim = pos = (u8 *) skb_put(skb, 6); 2306 *pos++ = WLAN_EID_TIM; 2307 *pos++ = 4; 2308 *pos++ = ps->dtim_count; 2309 *pos++ = sdata->vif.bss_conf.dtim_period; 2310 2311 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2312 aid0 = 1; 2313 2314 ps->dtim_bc_mc = aid0 == 1; 2315 2316 if (have_bits) { 2317 /* Find largest even number N1 so that bits numbered 1 through 2318 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2319 * (N2 + 1) x 8 through 2007 are 0. */ 2320 n1 = 0; 2321 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2322 if (ps->tim[i]) { 2323 n1 = i & 0xfe; 2324 break; 2325 } 2326 } 2327 n2 = n1; 2328 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2329 if (ps->tim[i]) { 2330 n2 = i; 2331 break; 2332 } 2333 } 2334 2335 /* Bitmap control */ 2336 *pos++ = n1 | aid0; 2337 /* Part Virt Bitmap */ 2338 skb_put(skb, n2 - n1); 2339 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2340 2341 tim[1] = n2 - n1 + 4; 2342 } else { 2343 *pos++ = aid0; /* Bitmap control */ 2344 *pos++ = 0; /* Part Virt Bitmap */ 2345 } 2346 } 2347 2348 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2349 struct ps_data *ps, struct sk_buff *skb) 2350 { 2351 struct ieee80211_local *local = sdata->local; 2352 2353 /* 2354 * Not very nice, but we want to allow the driver to call 2355 * ieee80211_beacon_get() as a response to the set_tim() 2356 * callback. That, however, is already invoked under the 2357 * sta_lock to guarantee consistent and race-free update 2358 * of the tim bitmap in mac80211 and the driver. 2359 */ 2360 if (local->tim_in_locked_section) { 2361 __ieee80211_beacon_add_tim(sdata, ps, skb); 2362 } else { 2363 spin_lock(&local->tim_lock); 2364 __ieee80211_beacon_add_tim(sdata, ps, skb); 2365 spin_unlock(&local->tim_lock); 2366 } 2367 2368 return 0; 2369 } 2370 2371 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2372 struct ieee80211_vif *vif, 2373 u16 *tim_offset, u16 *tim_length) 2374 { 2375 struct ieee80211_local *local = hw_to_local(hw); 2376 struct sk_buff *skb = NULL; 2377 struct ieee80211_tx_info *info; 2378 struct ieee80211_sub_if_data *sdata = NULL; 2379 enum ieee80211_band band; 2380 struct ieee80211_tx_rate_control txrc; 2381 struct ieee80211_chanctx_conf *chanctx_conf; 2382 2383 rcu_read_lock(); 2384 2385 sdata = vif_to_sdata(vif); 2386 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2387 2388 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2389 goto out; 2390 2391 if (tim_offset) 2392 *tim_offset = 0; 2393 if (tim_length) 2394 *tim_length = 0; 2395 2396 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2397 struct ieee80211_if_ap *ap = &sdata->u.ap; 2398 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2399 2400 if (beacon) { 2401 /* 2402 * headroom, head length, 2403 * tail length and maximum TIM length 2404 */ 2405 skb = dev_alloc_skb(local->tx_headroom + 2406 beacon->head_len + 2407 beacon->tail_len + 256); 2408 if (!skb) 2409 goto out; 2410 2411 skb_reserve(skb, local->tx_headroom); 2412 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2413 beacon->head_len); 2414 2415 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2416 2417 if (tim_offset) 2418 *tim_offset = beacon->head_len; 2419 if (tim_length) 2420 *tim_length = skb->len - beacon->head_len; 2421 2422 if (beacon->tail) 2423 memcpy(skb_put(skb, beacon->tail_len), 2424 beacon->tail, beacon->tail_len); 2425 } else 2426 goto out; 2427 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2429 struct ieee80211_hdr *hdr; 2430 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2431 2432 if (!presp) 2433 goto out; 2434 2435 skb = skb_copy(presp, GFP_ATOMIC); 2436 if (!skb) 2437 goto out; 2438 2439 hdr = (struct ieee80211_hdr *) skb->data; 2440 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2441 IEEE80211_STYPE_BEACON); 2442 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2443 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2444 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); 2445 2446 if (!bcn) 2447 goto out; 2448 2449 if (ifmsh->sync_ops) 2450 ifmsh->sync_ops->adjust_tbtt( 2451 sdata); 2452 2453 skb = dev_alloc_skb(local->tx_headroom + 2454 bcn->head_len + 2455 256 + /* TIM IE */ 2456 bcn->tail_len); 2457 if (!skb) 2458 goto out; 2459 skb_reserve(skb, local->tx_headroom); 2460 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); 2461 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); 2462 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); 2463 } else { 2464 WARN_ON(1); 2465 goto out; 2466 } 2467 2468 band = chanctx_conf->def.chan->band; 2469 2470 info = IEEE80211_SKB_CB(skb); 2471 2472 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2473 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2474 info->band = band; 2475 2476 memset(&txrc, 0, sizeof(txrc)); 2477 txrc.hw = hw; 2478 txrc.sband = local->hw.wiphy->bands[band]; 2479 txrc.bss_conf = &sdata->vif.bss_conf; 2480 txrc.skb = skb; 2481 txrc.reported_rate.idx = -1; 2482 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2483 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2484 txrc.max_rate_idx = -1; 2485 else 2486 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2487 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2488 sizeof(txrc.rate_idx_mcs_mask)); 2489 txrc.bss = true; 2490 rate_control_get_rate(sdata, NULL, &txrc); 2491 2492 info->control.vif = vif; 2493 2494 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2495 IEEE80211_TX_CTL_ASSIGN_SEQ | 2496 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2497 out: 2498 rcu_read_unlock(); 2499 return skb; 2500 } 2501 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2502 2503 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2504 struct ieee80211_vif *vif) 2505 { 2506 struct ieee80211_if_ap *ap = NULL; 2507 struct sk_buff *skb = NULL; 2508 struct probe_resp *presp = NULL; 2509 struct ieee80211_hdr *hdr; 2510 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2511 2512 if (sdata->vif.type != NL80211_IFTYPE_AP) 2513 return NULL; 2514 2515 rcu_read_lock(); 2516 2517 ap = &sdata->u.ap; 2518 presp = rcu_dereference(ap->probe_resp); 2519 if (!presp) 2520 goto out; 2521 2522 skb = dev_alloc_skb(presp->len); 2523 if (!skb) 2524 goto out; 2525 2526 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2527 2528 hdr = (struct ieee80211_hdr *) skb->data; 2529 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2530 2531 out: 2532 rcu_read_unlock(); 2533 return skb; 2534 } 2535 EXPORT_SYMBOL(ieee80211_proberesp_get); 2536 2537 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2538 struct ieee80211_vif *vif) 2539 { 2540 struct ieee80211_sub_if_data *sdata; 2541 struct ieee80211_if_managed *ifmgd; 2542 struct ieee80211_pspoll *pspoll; 2543 struct ieee80211_local *local; 2544 struct sk_buff *skb; 2545 2546 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2547 return NULL; 2548 2549 sdata = vif_to_sdata(vif); 2550 ifmgd = &sdata->u.mgd; 2551 local = sdata->local; 2552 2553 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2554 if (!skb) 2555 return NULL; 2556 2557 skb_reserve(skb, local->hw.extra_tx_headroom); 2558 2559 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2560 memset(pspoll, 0, sizeof(*pspoll)); 2561 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2562 IEEE80211_STYPE_PSPOLL); 2563 pspoll->aid = cpu_to_le16(ifmgd->aid); 2564 2565 /* aid in PS-Poll has its two MSBs each set to 1 */ 2566 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2567 2568 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2569 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2570 2571 return skb; 2572 } 2573 EXPORT_SYMBOL(ieee80211_pspoll_get); 2574 2575 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2576 struct ieee80211_vif *vif) 2577 { 2578 struct ieee80211_hdr_3addr *nullfunc; 2579 struct ieee80211_sub_if_data *sdata; 2580 struct ieee80211_if_managed *ifmgd; 2581 struct ieee80211_local *local; 2582 struct sk_buff *skb; 2583 2584 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2585 return NULL; 2586 2587 sdata = vif_to_sdata(vif); 2588 ifmgd = &sdata->u.mgd; 2589 local = sdata->local; 2590 2591 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2592 if (!skb) 2593 return NULL; 2594 2595 skb_reserve(skb, local->hw.extra_tx_headroom); 2596 2597 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2598 sizeof(*nullfunc)); 2599 memset(nullfunc, 0, sizeof(*nullfunc)); 2600 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2601 IEEE80211_STYPE_NULLFUNC | 2602 IEEE80211_FCTL_TODS); 2603 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2604 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2605 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2606 2607 return skb; 2608 } 2609 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2610 2611 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2612 struct ieee80211_vif *vif, 2613 const u8 *ssid, size_t ssid_len, 2614 size_t tailroom) 2615 { 2616 struct ieee80211_sub_if_data *sdata; 2617 struct ieee80211_local *local; 2618 struct ieee80211_hdr_3addr *hdr; 2619 struct sk_buff *skb; 2620 size_t ie_ssid_len; 2621 u8 *pos; 2622 2623 sdata = vif_to_sdata(vif); 2624 local = sdata->local; 2625 ie_ssid_len = 2 + ssid_len; 2626 2627 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2628 ie_ssid_len + tailroom); 2629 if (!skb) 2630 return NULL; 2631 2632 skb_reserve(skb, local->hw.extra_tx_headroom); 2633 2634 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2635 memset(hdr, 0, sizeof(*hdr)); 2636 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2637 IEEE80211_STYPE_PROBE_REQ); 2638 eth_broadcast_addr(hdr->addr1); 2639 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2640 eth_broadcast_addr(hdr->addr3); 2641 2642 pos = skb_put(skb, ie_ssid_len); 2643 *pos++ = WLAN_EID_SSID; 2644 *pos++ = ssid_len; 2645 if (ssid_len) 2646 memcpy(pos, ssid, ssid_len); 2647 pos += ssid_len; 2648 2649 return skb; 2650 } 2651 EXPORT_SYMBOL(ieee80211_probereq_get); 2652 2653 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2654 const void *frame, size_t frame_len, 2655 const struct ieee80211_tx_info *frame_txctl, 2656 struct ieee80211_rts *rts) 2657 { 2658 const struct ieee80211_hdr *hdr = frame; 2659 2660 rts->frame_control = 2661 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2662 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2663 frame_txctl); 2664 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2665 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2666 } 2667 EXPORT_SYMBOL(ieee80211_rts_get); 2668 2669 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2670 const void *frame, size_t frame_len, 2671 const struct ieee80211_tx_info *frame_txctl, 2672 struct ieee80211_cts *cts) 2673 { 2674 const struct ieee80211_hdr *hdr = frame; 2675 2676 cts->frame_control = 2677 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2678 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2679 frame_len, frame_txctl); 2680 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2681 } 2682 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2683 2684 struct sk_buff * 2685 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2686 struct ieee80211_vif *vif) 2687 { 2688 struct ieee80211_local *local = hw_to_local(hw); 2689 struct sk_buff *skb = NULL; 2690 struct ieee80211_tx_data tx; 2691 struct ieee80211_sub_if_data *sdata; 2692 struct ps_data *ps; 2693 struct ieee80211_tx_info *info; 2694 struct ieee80211_chanctx_conf *chanctx_conf; 2695 2696 sdata = vif_to_sdata(vif); 2697 2698 rcu_read_lock(); 2699 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2700 2701 if (!chanctx_conf) 2702 goto out; 2703 2704 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2705 struct beacon_data *beacon = 2706 rcu_dereference(sdata->u.ap.beacon); 2707 2708 if (!beacon || !beacon->head) 2709 goto out; 2710 2711 ps = &sdata->u.ap.ps; 2712 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2713 ps = &sdata->u.mesh.ps; 2714 } else { 2715 goto out; 2716 } 2717 2718 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2719 goto out; /* send buffered bc/mc only after DTIM beacon */ 2720 2721 while (1) { 2722 skb = skb_dequeue(&ps->bc_buf); 2723 if (!skb) 2724 goto out; 2725 local->total_ps_buffered--; 2726 2727 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2728 struct ieee80211_hdr *hdr = 2729 (struct ieee80211_hdr *) skb->data; 2730 /* more buffered multicast/broadcast frames ==> set 2731 * MoreData flag in IEEE 802.11 header to inform PS 2732 * STAs */ 2733 hdr->frame_control |= 2734 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2735 } 2736 2737 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 2738 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2739 break; 2740 dev_kfree_skb_any(skb); 2741 } 2742 2743 info = IEEE80211_SKB_CB(skb); 2744 2745 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2746 info->band = chanctx_conf->def.chan->band; 2747 2748 if (invoke_tx_handlers(&tx)) 2749 skb = NULL; 2750 out: 2751 rcu_read_unlock(); 2752 2753 return skb; 2754 } 2755 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2756 2757 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2758 struct sk_buff *skb, int tid, 2759 enum ieee80211_band band) 2760 { 2761 int ac = ieee802_1d_to_ac[tid & 7]; 2762 2763 skb_set_mac_header(skb, 0); 2764 skb_set_network_header(skb, 0); 2765 skb_set_transport_header(skb, 0); 2766 2767 skb_set_queue_mapping(skb, ac); 2768 skb->priority = tid; 2769 2770 skb->dev = sdata->dev; 2771 2772 /* 2773 * The other path calling ieee80211_xmit is from the tasklet, 2774 * and while we can handle concurrent transmissions locking 2775 * requirements are that we do not come into tx with bhs on. 2776 */ 2777 local_bh_disable(); 2778 ieee80211_xmit(sdata, skb, band); 2779 local_bh_enable(); 2780 } 2781