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 /* 328 * virtual interfaces are protected by RCU 329 */ 330 rcu_read_lock(); 331 332 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 333 struct ieee80211_if_ap *ap; 334 if (sdata->vif.type != NL80211_IFTYPE_AP) 335 continue; 336 ap = &sdata->u.ap; 337 skb = skb_dequeue(&ap->ps_bc_buf); 338 if (skb) { 339 purged++; 340 dev_kfree_skb(skb); 341 } 342 total += skb_queue_len(&ap->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 rcu_read_unlock(); 364 365 local->total_ps_buffered = total; 366 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 367 } 368 369 static ieee80211_tx_result 370 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 371 { 372 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 373 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 374 375 /* 376 * broadcast/multicast frame 377 * 378 * If any of the associated 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 only in AP/VLAN mode */ 384 if (!tx->sdata->bss) 385 return TX_CONTINUE; 386 387 /* no buffering for ordered frames */ 388 if (ieee80211_has_order(hdr->frame_control)) 389 return TX_CONTINUE; 390 391 /* no stations in PS mode */ 392 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 393 return TX_CONTINUE; 394 395 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 396 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 397 info->hw_queue = tx->sdata->vif.cab_queue; 398 399 /* device releases frame after DTIM beacon */ 400 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 401 return TX_CONTINUE; 402 403 /* buffered in mac80211 */ 404 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 405 purge_old_ps_buffers(tx->local); 406 407 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 408 ps_dbg(tx->sdata, 409 "BC TX buffer full - dropping the oldest frame\n"); 410 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 411 } else 412 tx->local->total_ps_buffered++; 413 414 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 415 416 return TX_QUEUED; 417 } 418 419 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 420 struct sk_buff *skb) 421 { 422 if (!ieee80211_is_mgmt(fc)) 423 return 0; 424 425 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 426 return 0; 427 428 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 429 skb->data)) 430 return 0; 431 432 return 1; 433 } 434 435 static ieee80211_tx_result 436 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 437 { 438 struct sta_info *sta = tx->sta; 439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 441 struct ieee80211_local *local = tx->local; 442 443 if (unlikely(!sta)) 444 return TX_CONTINUE; 445 446 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 447 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 448 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 449 int ac = skb_get_queue_mapping(tx->skb); 450 451 /* only deauth, disassoc and action are bufferable MMPDUs */ 452 if (ieee80211_is_mgmt(hdr->frame_control) && 453 !ieee80211_is_deauth(hdr->frame_control) && 454 !ieee80211_is_disassoc(hdr->frame_control) && 455 !ieee80211_is_action(hdr->frame_control)) { 456 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 457 return TX_CONTINUE; 458 } 459 460 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 461 sta->sta.addr, sta->sta.aid, ac); 462 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 463 purge_old_ps_buffers(tx->local); 464 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 465 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 466 ps_dbg(tx->sdata, 467 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 468 sta->sta.addr, ac); 469 ieee80211_free_txskb(&local->hw, old); 470 } else 471 tx->local->total_ps_buffered++; 472 473 info->control.jiffies = jiffies; 474 info->control.vif = &tx->sdata->vif; 475 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 476 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 477 478 if (!timer_pending(&local->sta_cleanup)) 479 mod_timer(&local->sta_cleanup, 480 round_jiffies(jiffies + 481 STA_INFO_CLEANUP_INTERVAL)); 482 483 /* 484 * We queued up some frames, so the TIM bit might 485 * need to be set, recalculate it. 486 */ 487 sta_info_recalc_tim(sta); 488 489 return TX_QUEUED; 490 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 491 ps_dbg(tx->sdata, 492 "STA %pM in PS mode, but polling/in SP -> send frame\n", 493 sta->sta.addr); 494 } 495 496 return TX_CONTINUE; 497 } 498 499 static ieee80211_tx_result debug_noinline 500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 501 { 502 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 503 return TX_CONTINUE; 504 505 if (tx->flags & IEEE80211_TX_UNICAST) 506 return ieee80211_tx_h_unicast_ps_buf(tx); 507 else 508 return ieee80211_tx_h_multicast_ps_buf(tx); 509 } 510 511 static ieee80211_tx_result debug_noinline 512 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 513 { 514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 515 516 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 517 tx->sdata->control_port_no_encrypt)) 518 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 519 520 return TX_CONTINUE; 521 } 522 523 static ieee80211_tx_result debug_noinline 524 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 525 { 526 struct ieee80211_key *key; 527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 529 530 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 531 tx->key = NULL; 532 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 533 tx->key = key; 534 else if (ieee80211_is_mgmt(hdr->frame_control) && 535 is_multicast_ether_addr(hdr->addr1) && 536 ieee80211_is_robust_mgmt_frame(hdr) && 537 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 538 tx->key = key; 539 else if (is_multicast_ether_addr(hdr->addr1) && 540 (key = rcu_dereference(tx->sdata->default_multicast_key))) 541 tx->key = key; 542 else if (!is_multicast_ether_addr(hdr->addr1) && 543 (key = rcu_dereference(tx->sdata->default_unicast_key))) 544 tx->key = key; 545 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 546 tx->key = NULL; 547 else if (!tx->sdata->drop_unencrypted) 548 tx->key = NULL; 549 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 550 tx->key = NULL; 551 else if (ieee80211_is_robust_mgmt_frame(hdr) && 552 !(ieee80211_is_action(hdr->frame_control) && 553 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 554 tx->key = NULL; 555 else if (ieee80211_is_mgmt(hdr->frame_control) && 556 !ieee80211_is_robust_mgmt_frame(hdr)) 557 tx->key = NULL; 558 else { 559 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 560 return TX_DROP; 561 } 562 563 if (tx->key) { 564 bool skip_hw = false; 565 566 tx->key->tx_rx_count++; 567 /* TODO: add threshold stuff again */ 568 569 switch (tx->key->conf.cipher) { 570 case WLAN_CIPHER_SUITE_WEP40: 571 case WLAN_CIPHER_SUITE_WEP104: 572 case WLAN_CIPHER_SUITE_TKIP: 573 if (!ieee80211_is_data_present(hdr->frame_control)) 574 tx->key = NULL; 575 break; 576 case WLAN_CIPHER_SUITE_CCMP: 577 if (!ieee80211_is_data_present(hdr->frame_control) && 578 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 579 tx->skb)) 580 tx->key = NULL; 581 else 582 skip_hw = (tx->key->conf.flags & 583 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 584 ieee80211_is_mgmt(hdr->frame_control); 585 break; 586 case WLAN_CIPHER_SUITE_AES_CMAC: 587 if (!ieee80211_is_mgmt(hdr->frame_control)) 588 tx->key = NULL; 589 break; 590 } 591 592 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 593 return TX_DROP; 594 595 if (!skip_hw && tx->key && 596 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 597 info->control.hw_key = &tx->key->conf; 598 } 599 600 return TX_CONTINUE; 601 } 602 603 static ieee80211_tx_result debug_noinline 604 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 605 { 606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 607 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 608 struct ieee80211_supported_band *sband; 609 struct ieee80211_rate *rate; 610 int i; 611 u32 len; 612 bool inval = false, rts = false, short_preamble = false; 613 struct ieee80211_tx_rate_control txrc; 614 bool assoc = false; 615 616 memset(&txrc, 0, sizeof(txrc)); 617 618 sband = tx->local->hw.wiphy->bands[info->band]; 619 620 len = min_t(u32, tx->skb->len + FCS_LEN, 621 tx->local->hw.wiphy->frag_threshold); 622 623 /* set up the tx rate control struct we give the RC algo */ 624 txrc.hw = &tx->local->hw; 625 txrc.sband = sband; 626 txrc.bss_conf = &tx->sdata->vif.bss_conf; 627 txrc.skb = tx->skb; 628 txrc.reported_rate.idx = -1; 629 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 630 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 631 txrc.max_rate_idx = -1; 632 else 633 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 634 memcpy(txrc.rate_idx_mcs_mask, 635 tx->sdata->rc_rateidx_mcs_mask[info->band], 636 sizeof(txrc.rate_idx_mcs_mask)); 637 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 638 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 639 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 640 641 /* set up RTS protection if desired */ 642 if (len > tx->local->hw.wiphy->rts_threshold) { 643 txrc.rts = rts = true; 644 } 645 646 /* 647 * Use short preamble if the BSS can handle it, but not for 648 * management frames unless we know the receiver can handle 649 * that -- the management frame might be to a station that 650 * just wants a probe response. 651 */ 652 if (tx->sdata->vif.bss_conf.use_short_preamble && 653 (ieee80211_is_data(hdr->frame_control) || 654 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 655 txrc.short_preamble = short_preamble = true; 656 657 if (tx->sta) 658 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 659 660 /* 661 * Lets not bother rate control if we're associated and cannot 662 * talk to the sta. This should not happen. 663 */ 664 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 665 !rate_usable_index_exists(sband, &tx->sta->sta), 666 "%s: Dropped data frame as no usable bitrate found while " 667 "scanning and associated. Target station: " 668 "%pM on %d GHz band\n", 669 tx->sdata->name, hdr->addr1, 670 info->band ? 5 : 2)) 671 return TX_DROP; 672 673 /* 674 * If we're associated with the sta at this point we know we can at 675 * least send the frame at the lowest bit rate. 676 */ 677 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 678 679 if (unlikely(info->control.rates[0].idx < 0)) 680 return TX_DROP; 681 682 if (txrc.reported_rate.idx < 0) { 683 txrc.reported_rate = info->control.rates[0]; 684 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 685 tx->sta->last_tx_rate = txrc.reported_rate; 686 } else if (tx->sta) 687 tx->sta->last_tx_rate = txrc.reported_rate; 688 689 if (unlikely(!info->control.rates[0].count)) 690 info->control.rates[0].count = 1; 691 692 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 693 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 694 info->control.rates[0].count = 1; 695 696 if (is_multicast_ether_addr(hdr->addr1)) { 697 /* 698 * XXX: verify the rate is in the basic rateset 699 */ 700 return TX_CONTINUE; 701 } 702 703 /* 704 * set up the RTS/CTS rate as the fastest basic rate 705 * that is not faster than the data rate 706 * 707 * XXX: Should this check all retry rates? 708 */ 709 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 710 s8 baserate = 0; 711 712 rate = &sband->bitrates[info->control.rates[0].idx]; 713 714 for (i = 0; i < sband->n_bitrates; i++) { 715 /* must be a basic rate */ 716 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 717 continue; 718 /* must not be faster than the data rate */ 719 if (sband->bitrates[i].bitrate > rate->bitrate) 720 continue; 721 /* maximum */ 722 if (sband->bitrates[baserate].bitrate < 723 sband->bitrates[i].bitrate) 724 baserate = i; 725 } 726 727 info->control.rts_cts_rate_idx = baserate; 728 } 729 730 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 731 /* 732 * make sure there's no valid rate following 733 * an invalid one, just in case drivers don't 734 * take the API seriously to stop at -1. 735 */ 736 if (inval) { 737 info->control.rates[i].idx = -1; 738 continue; 739 } 740 if (info->control.rates[i].idx < 0) { 741 inval = true; 742 continue; 743 } 744 745 /* 746 * For now assume MCS is already set up correctly, this 747 * needs to be fixed. 748 */ 749 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 750 WARN_ON(info->control.rates[i].idx > 76); 751 continue; 752 } 753 754 /* set up RTS protection if desired */ 755 if (rts) 756 info->control.rates[i].flags |= 757 IEEE80211_TX_RC_USE_RTS_CTS; 758 759 /* RC is busted */ 760 if (WARN_ON_ONCE(info->control.rates[i].idx >= 761 sband->n_bitrates)) { 762 info->control.rates[i].idx = -1; 763 continue; 764 } 765 766 rate = &sband->bitrates[info->control.rates[i].idx]; 767 768 /* set up short preamble */ 769 if (short_preamble && 770 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 771 info->control.rates[i].flags |= 772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 773 774 /* set up G protection */ 775 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 776 rate->flags & IEEE80211_RATE_ERP_G) 777 info->control.rates[i].flags |= 778 IEEE80211_TX_RC_USE_CTS_PROTECT; 779 } 780 781 return TX_CONTINUE; 782 } 783 784 static ieee80211_tx_result debug_noinline 785 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 786 { 787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 788 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 789 u16 *seq; 790 u8 *qc; 791 int tid; 792 793 /* 794 * Packet injection may want to control the sequence 795 * number, if we have no matching interface then we 796 * neither assign one ourselves nor ask the driver to. 797 */ 798 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 799 return TX_CONTINUE; 800 801 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 802 return TX_CONTINUE; 803 804 if (ieee80211_hdrlen(hdr->frame_control) < 24) 805 return TX_CONTINUE; 806 807 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 808 return TX_CONTINUE; 809 810 /* 811 * Anything but QoS data that has a sequence number field 812 * (is long enough) gets a sequence number from the global 813 * counter. 814 */ 815 if (!ieee80211_is_data_qos(hdr->frame_control)) { 816 /* driver should assign sequence number */ 817 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 818 /* for pure STA mode without beacons, we can do it */ 819 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 820 tx->sdata->sequence_number += 0x10; 821 return TX_CONTINUE; 822 } 823 824 /* 825 * This should be true for injected/management frames only, for 826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 827 * above since they are not QoS-data frames. 828 */ 829 if (!tx->sta) 830 return TX_CONTINUE; 831 832 /* include per-STA, per-TID sequence counter */ 833 834 qc = ieee80211_get_qos_ctl(hdr); 835 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 836 seq = &tx->sta->tid_seq[tid]; 837 838 hdr->seq_ctrl = cpu_to_le16(*seq); 839 840 /* Increase the sequence number. */ 841 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 842 843 return TX_CONTINUE; 844 } 845 846 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 847 struct sk_buff *skb, int hdrlen, 848 int frag_threshold) 849 { 850 struct ieee80211_local *local = tx->local; 851 struct ieee80211_tx_info *info; 852 struct sk_buff *tmp; 853 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 854 int pos = hdrlen + per_fragm; 855 int rem = skb->len - hdrlen - per_fragm; 856 857 if (WARN_ON(rem < 0)) 858 return -EINVAL; 859 860 /* first fragment was already added to queue by caller */ 861 862 while (rem) { 863 int fraglen = per_fragm; 864 865 if (fraglen > rem) 866 fraglen = rem; 867 rem -= fraglen; 868 tmp = dev_alloc_skb(local->tx_headroom + 869 frag_threshold + 870 IEEE80211_ENCRYPT_HEADROOM + 871 IEEE80211_ENCRYPT_TAILROOM); 872 if (!tmp) 873 return -ENOMEM; 874 875 __skb_queue_tail(&tx->skbs, tmp); 876 877 skb_reserve(tmp, local->tx_headroom + 878 IEEE80211_ENCRYPT_HEADROOM); 879 /* copy control information */ 880 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 881 882 info = IEEE80211_SKB_CB(tmp); 883 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 884 IEEE80211_TX_CTL_FIRST_FRAGMENT); 885 886 if (rem) 887 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 888 889 skb_copy_queue_mapping(tmp, skb); 890 tmp->priority = skb->priority; 891 tmp->dev = skb->dev; 892 893 /* copy header and data */ 894 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 895 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 896 897 pos += fraglen; 898 } 899 900 /* adjust first fragment's length */ 901 skb->len = hdrlen + per_fragm; 902 return 0; 903 } 904 905 static ieee80211_tx_result debug_noinline 906 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 907 { 908 struct sk_buff *skb = tx->skb; 909 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 910 struct ieee80211_hdr *hdr = (void *)skb->data; 911 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 912 int hdrlen; 913 int fragnum; 914 915 /* no matter what happens, tx->skb moves to tx->skbs */ 916 __skb_queue_tail(&tx->skbs, skb); 917 tx->skb = NULL; 918 919 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 920 return TX_CONTINUE; 921 922 if (tx->local->ops->set_frag_threshold) 923 return TX_CONTINUE; 924 925 /* 926 * Warn when submitting a fragmented A-MPDU frame and drop it. 927 * This scenario is handled in ieee80211_tx_prepare but extra 928 * caution taken here as fragmented ampdu may cause Tx stop. 929 */ 930 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 931 return TX_DROP; 932 933 hdrlen = ieee80211_hdrlen(hdr->frame_control); 934 935 /* internal error, why isn't DONTFRAG set? */ 936 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 937 return TX_DROP; 938 939 /* 940 * Now fragment the frame. This will allocate all the fragments and 941 * chain them (using skb as the first fragment) to skb->next. 942 * During transmission, we will remove the successfully transmitted 943 * fragments from this list. When the low-level driver rejects one 944 * of the fragments then we will simply pretend to accept the skb 945 * but store it away as pending. 946 */ 947 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 948 return TX_DROP; 949 950 /* update duration/seq/flags of fragments */ 951 fragnum = 0; 952 953 skb_queue_walk(&tx->skbs, skb) { 954 int next_len; 955 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 956 957 hdr = (void *)skb->data; 958 info = IEEE80211_SKB_CB(skb); 959 960 if (!skb_queue_is_last(&tx->skbs, skb)) { 961 hdr->frame_control |= morefrags; 962 /* 963 * No multi-rate retries for fragmented frames, that 964 * would completely throw off the NAV at other STAs. 965 */ 966 info->control.rates[1].idx = -1; 967 info->control.rates[2].idx = -1; 968 info->control.rates[3].idx = -1; 969 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 970 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 971 } else { 972 hdr->frame_control &= ~morefrags; 973 next_len = 0; 974 } 975 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 976 fragnum++; 977 } 978 979 return TX_CONTINUE; 980 } 981 982 static ieee80211_tx_result debug_noinline 983 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 984 { 985 struct sk_buff *skb; 986 987 if (!tx->sta) 988 return TX_CONTINUE; 989 990 tx->sta->tx_packets++; 991 skb_queue_walk(&tx->skbs, skb) { 992 tx->sta->tx_fragments++; 993 tx->sta->tx_bytes += skb->len; 994 } 995 996 return TX_CONTINUE; 997 } 998 999 static ieee80211_tx_result debug_noinline 1000 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1001 { 1002 if (!tx->key) 1003 return TX_CONTINUE; 1004 1005 switch (tx->key->conf.cipher) { 1006 case WLAN_CIPHER_SUITE_WEP40: 1007 case WLAN_CIPHER_SUITE_WEP104: 1008 return ieee80211_crypto_wep_encrypt(tx); 1009 case WLAN_CIPHER_SUITE_TKIP: 1010 return ieee80211_crypto_tkip_encrypt(tx); 1011 case WLAN_CIPHER_SUITE_CCMP: 1012 return ieee80211_crypto_ccmp_encrypt(tx); 1013 case WLAN_CIPHER_SUITE_AES_CMAC: 1014 return ieee80211_crypto_aes_cmac_encrypt(tx); 1015 default: 1016 return ieee80211_crypto_hw_encrypt(tx); 1017 } 1018 1019 return TX_DROP; 1020 } 1021 1022 static ieee80211_tx_result debug_noinline 1023 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1024 { 1025 struct sk_buff *skb; 1026 struct ieee80211_hdr *hdr; 1027 int next_len; 1028 bool group_addr; 1029 1030 skb_queue_walk(&tx->skbs, skb) { 1031 hdr = (void *) skb->data; 1032 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1033 break; /* must not overwrite AID */ 1034 if (!skb_queue_is_last(&tx->skbs, skb)) { 1035 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1036 next_len = next->len; 1037 } else 1038 next_len = 0; 1039 group_addr = is_multicast_ether_addr(hdr->addr1); 1040 1041 hdr->duration_id = 1042 ieee80211_duration(tx, skb, group_addr, next_len); 1043 } 1044 1045 return TX_CONTINUE; 1046 } 1047 1048 /* actual transmit path */ 1049 1050 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1051 struct sk_buff *skb, 1052 struct ieee80211_tx_info *info, 1053 struct tid_ampdu_tx *tid_tx, 1054 int tid) 1055 { 1056 bool queued = false; 1057 bool reset_agg_timer = false; 1058 struct sk_buff *purge_skb = NULL; 1059 1060 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1061 info->flags |= IEEE80211_TX_CTL_AMPDU; 1062 reset_agg_timer = true; 1063 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1064 /* 1065 * nothing -- this aggregation session is being started 1066 * but that might still fail with the driver 1067 */ 1068 } else { 1069 spin_lock(&tx->sta->lock); 1070 /* 1071 * Need to re-check now, because we may get here 1072 * 1073 * 1) in the window during which the setup is actually 1074 * already done, but not marked yet because not all 1075 * packets are spliced over to the driver pending 1076 * queue yet -- if this happened we acquire the lock 1077 * either before or after the splice happens, but 1078 * need to recheck which of these cases happened. 1079 * 1080 * 2) during session teardown, if the OPERATIONAL bit 1081 * was cleared due to the teardown but the pointer 1082 * hasn't been assigned NULL yet (or we loaded it 1083 * before it was assigned) -- in this case it may 1084 * now be NULL which means we should just let the 1085 * packet pass through because splicing the frames 1086 * back is already done. 1087 */ 1088 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1089 1090 if (!tid_tx) { 1091 /* do nothing, let packet pass through */ 1092 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1093 info->flags |= IEEE80211_TX_CTL_AMPDU; 1094 reset_agg_timer = true; 1095 } else { 1096 queued = true; 1097 info->control.vif = &tx->sdata->vif; 1098 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1099 __skb_queue_tail(&tid_tx->pending, skb); 1100 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1101 purge_skb = __skb_dequeue(&tid_tx->pending); 1102 } 1103 spin_unlock(&tx->sta->lock); 1104 1105 if (purge_skb) 1106 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1107 } 1108 1109 /* reset session timer */ 1110 if (reset_agg_timer && tid_tx->timeout) 1111 tid_tx->last_tx = jiffies; 1112 1113 return queued; 1114 } 1115 1116 /* 1117 * initialises @tx 1118 */ 1119 static ieee80211_tx_result 1120 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1121 struct ieee80211_tx_data *tx, 1122 struct sk_buff *skb) 1123 { 1124 struct ieee80211_local *local = sdata->local; 1125 struct ieee80211_hdr *hdr; 1126 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1127 int tid; 1128 u8 *qc; 1129 1130 memset(tx, 0, sizeof(*tx)); 1131 tx->skb = skb; 1132 tx->local = local; 1133 tx->sdata = sdata; 1134 __skb_queue_head_init(&tx->skbs); 1135 1136 /* 1137 * If this flag is set to true anywhere, and we get here, 1138 * we are doing the needed processing, so remove the flag 1139 * now. 1140 */ 1141 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1142 1143 hdr = (struct ieee80211_hdr *) skb->data; 1144 1145 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1146 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1147 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1148 return TX_DROP; 1149 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1150 tx->sdata->control_port_protocol == tx->skb->protocol) { 1151 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1152 } 1153 if (!tx->sta) 1154 tx->sta = sta_info_get(sdata, hdr->addr1); 1155 1156 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1157 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1158 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1159 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1160 struct tid_ampdu_tx *tid_tx; 1161 1162 qc = ieee80211_get_qos_ctl(hdr); 1163 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1164 1165 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1166 if (tid_tx) { 1167 bool queued; 1168 1169 queued = ieee80211_tx_prep_agg(tx, skb, info, 1170 tid_tx, tid); 1171 1172 if (unlikely(queued)) 1173 return TX_QUEUED; 1174 } 1175 } 1176 1177 if (is_multicast_ether_addr(hdr->addr1)) { 1178 tx->flags &= ~IEEE80211_TX_UNICAST; 1179 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1180 } else 1181 tx->flags |= IEEE80211_TX_UNICAST; 1182 1183 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1184 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1185 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1186 info->flags & IEEE80211_TX_CTL_AMPDU) 1187 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1188 } 1189 1190 if (!tx->sta) 1191 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1192 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1193 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1194 1195 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1196 1197 return TX_CONTINUE; 1198 } 1199 1200 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1201 struct ieee80211_vif *vif, 1202 struct ieee80211_sta *sta, 1203 struct sk_buff_head *skbs, 1204 bool txpending) 1205 { 1206 struct ieee80211_tx_control control; 1207 struct sk_buff *skb, *tmp; 1208 unsigned long flags; 1209 1210 skb_queue_walk_safe(skbs, skb, tmp) { 1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1212 int q = info->hw_queue; 1213 1214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1215 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1216 __skb_unlink(skb, skbs); 1217 ieee80211_free_txskb(&local->hw, skb); 1218 continue; 1219 } 1220 #endif 1221 1222 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1223 if (local->queue_stop_reasons[q] || 1224 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1225 /* 1226 * Since queue is stopped, queue up frames for later 1227 * transmission from the tx-pending tasklet when the 1228 * queue is woken again. 1229 */ 1230 if (txpending) 1231 skb_queue_splice_init(skbs, &local->pending[q]); 1232 else 1233 skb_queue_splice_tail_init(skbs, 1234 &local->pending[q]); 1235 1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1237 flags); 1238 return false; 1239 } 1240 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1241 1242 info->control.vif = vif; 1243 control.sta = sta; 1244 1245 __skb_unlink(skb, skbs); 1246 drv_tx(local, &control, skb); 1247 } 1248 1249 return true; 1250 } 1251 1252 /* 1253 * Returns false if the frame couldn't be transmitted but was queued instead. 1254 */ 1255 static bool __ieee80211_tx(struct ieee80211_local *local, 1256 struct sk_buff_head *skbs, int led_len, 1257 struct sta_info *sta, bool txpending) 1258 { 1259 struct ieee80211_tx_info *info; 1260 struct ieee80211_sub_if_data *sdata; 1261 struct ieee80211_vif *vif; 1262 struct ieee80211_sta *pubsta; 1263 struct sk_buff *skb; 1264 bool result = true; 1265 __le16 fc; 1266 1267 if (WARN_ON(skb_queue_empty(skbs))) 1268 return true; 1269 1270 skb = skb_peek(skbs); 1271 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1272 info = IEEE80211_SKB_CB(skb); 1273 sdata = vif_to_sdata(info->control.vif); 1274 if (sta && !sta->uploaded) 1275 sta = NULL; 1276 1277 if (sta) 1278 pubsta = &sta->sta; 1279 else 1280 pubsta = NULL; 1281 1282 switch (sdata->vif.type) { 1283 case NL80211_IFTYPE_MONITOR: 1284 sdata = rcu_dereference(local->monitor_sdata); 1285 if (sdata) { 1286 vif = &sdata->vif; 1287 info->hw_queue = 1288 vif->hw_queue[skb_get_queue_mapping(skb)]; 1289 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1290 dev_kfree_skb(skb); 1291 return true; 1292 } else 1293 vif = NULL; 1294 break; 1295 case NL80211_IFTYPE_AP_VLAN: 1296 sdata = container_of(sdata->bss, 1297 struct ieee80211_sub_if_data, u.ap); 1298 /* fall through */ 1299 default: 1300 vif = &sdata->vif; 1301 break; 1302 } 1303 1304 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1305 txpending); 1306 1307 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1308 ieee80211_led_tx(local, 1); 1309 1310 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1311 1312 return result; 1313 } 1314 1315 /* 1316 * Invoke TX handlers, return 0 on success and non-zero if the 1317 * frame was dropped or queued. 1318 */ 1319 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1320 { 1321 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1322 ieee80211_tx_result res = TX_DROP; 1323 1324 #define CALL_TXH(txh) \ 1325 do { \ 1326 res = txh(tx); \ 1327 if (res != TX_CONTINUE) \ 1328 goto txh_done; \ 1329 } while (0) 1330 1331 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1332 CALL_TXH(ieee80211_tx_h_check_assoc); 1333 CALL_TXH(ieee80211_tx_h_ps_buf); 1334 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1335 CALL_TXH(ieee80211_tx_h_select_key); 1336 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1337 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1338 1339 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1340 __skb_queue_tail(&tx->skbs, tx->skb); 1341 tx->skb = NULL; 1342 goto txh_done; 1343 } 1344 1345 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1346 CALL_TXH(ieee80211_tx_h_sequence); 1347 CALL_TXH(ieee80211_tx_h_fragment); 1348 /* handlers after fragment must be aware of tx info fragmentation! */ 1349 CALL_TXH(ieee80211_tx_h_stats); 1350 CALL_TXH(ieee80211_tx_h_encrypt); 1351 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1352 CALL_TXH(ieee80211_tx_h_calculate_duration); 1353 #undef CALL_TXH 1354 1355 txh_done: 1356 if (unlikely(res == TX_DROP)) { 1357 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1358 if (tx->skb) 1359 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1360 else 1361 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1362 return -1; 1363 } else if (unlikely(res == TX_QUEUED)) { 1364 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1365 return -1; 1366 } 1367 1368 return 0; 1369 } 1370 1371 /* 1372 * Returns false if the frame couldn't be transmitted but was queued instead. 1373 */ 1374 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1375 struct sk_buff *skb, bool txpending) 1376 { 1377 struct ieee80211_local *local = sdata->local; 1378 struct ieee80211_tx_data tx; 1379 ieee80211_tx_result res_prepare; 1380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1381 bool result = true; 1382 int led_len; 1383 1384 if (unlikely(skb->len < 10)) { 1385 dev_kfree_skb(skb); 1386 return true; 1387 } 1388 1389 rcu_read_lock(); 1390 1391 /* initialises tx */ 1392 led_len = skb->len; 1393 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1394 1395 if (unlikely(res_prepare == TX_DROP)) { 1396 ieee80211_free_txskb(&local->hw, skb); 1397 goto out; 1398 } else if (unlikely(res_prepare == TX_QUEUED)) { 1399 goto out; 1400 } 1401 1402 info->band = local->hw.conf.channel->band; 1403 1404 /* set up hw_queue value early */ 1405 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1406 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1407 info->hw_queue = 1408 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1409 1410 if (!invoke_tx_handlers(&tx)) 1411 result = __ieee80211_tx(local, &tx.skbs, led_len, 1412 tx.sta, txpending); 1413 out: 1414 rcu_read_unlock(); 1415 return result; 1416 } 1417 1418 /* device xmit handlers */ 1419 1420 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1421 struct sk_buff *skb, 1422 int head_need, bool may_encrypt) 1423 { 1424 struct ieee80211_local *local = sdata->local; 1425 int tail_need = 0; 1426 1427 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1428 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1429 tail_need -= skb_tailroom(skb); 1430 tail_need = max_t(int, tail_need, 0); 1431 } 1432 1433 if (skb_cloned(skb)) 1434 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1435 else if (head_need || tail_need) 1436 I802_DEBUG_INC(local->tx_expand_skb_head); 1437 else 1438 return 0; 1439 1440 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1441 wiphy_debug(local->hw.wiphy, 1442 "failed to reallocate TX buffer\n"); 1443 return -ENOMEM; 1444 } 1445 1446 return 0; 1447 } 1448 1449 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1450 { 1451 struct ieee80211_local *local = sdata->local; 1452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1454 int headroom; 1455 bool may_encrypt; 1456 1457 rcu_read_lock(); 1458 1459 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1460 1461 headroom = local->tx_headroom; 1462 if (may_encrypt) 1463 headroom += IEEE80211_ENCRYPT_HEADROOM; 1464 headroom -= skb_headroom(skb); 1465 headroom = max_t(int, 0, headroom); 1466 1467 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1468 ieee80211_free_txskb(&local->hw, skb); 1469 rcu_read_unlock(); 1470 return; 1471 } 1472 1473 hdr = (struct ieee80211_hdr *) skb->data; 1474 info->control.vif = &sdata->vif; 1475 1476 if (ieee80211_vif_is_mesh(&sdata->vif) && 1477 ieee80211_is_data(hdr->frame_control) && 1478 !is_multicast_ether_addr(hdr->addr1) && 1479 mesh_nexthop_resolve(skb, sdata)) { 1480 /* skb queued: don't free */ 1481 rcu_read_unlock(); 1482 return; 1483 } 1484 1485 ieee80211_set_qos_hdr(sdata, skb); 1486 ieee80211_tx(sdata, skb, false); 1487 rcu_read_unlock(); 1488 } 1489 1490 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1491 { 1492 struct ieee80211_radiotap_iterator iterator; 1493 struct ieee80211_radiotap_header *rthdr = 1494 (struct ieee80211_radiotap_header *) skb->data; 1495 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1496 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1497 NULL); 1498 u16 txflags; 1499 1500 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1501 IEEE80211_TX_CTL_DONTFRAG; 1502 1503 /* 1504 * for every radiotap entry that is present 1505 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1506 * entries present, or -EINVAL on error) 1507 */ 1508 1509 while (!ret) { 1510 ret = ieee80211_radiotap_iterator_next(&iterator); 1511 1512 if (ret) 1513 continue; 1514 1515 /* see if this argument is something we can use */ 1516 switch (iterator.this_arg_index) { 1517 /* 1518 * You must take care when dereferencing iterator.this_arg 1519 * for multibyte types... the pointer is not aligned. Use 1520 * get_unaligned((type *)iterator.this_arg) to dereference 1521 * iterator.this_arg for type "type" safely on all arches. 1522 */ 1523 case IEEE80211_RADIOTAP_FLAGS: 1524 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1525 /* 1526 * this indicates that the skb we have been 1527 * handed has the 32-bit FCS CRC at the end... 1528 * we should react to that by snipping it off 1529 * because it will be recomputed and added 1530 * on transmission 1531 */ 1532 if (skb->len < (iterator._max_length + FCS_LEN)) 1533 return false; 1534 1535 skb_trim(skb, skb->len - FCS_LEN); 1536 } 1537 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1538 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1539 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1540 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1541 break; 1542 1543 case IEEE80211_RADIOTAP_TX_FLAGS: 1544 txflags = get_unaligned_le16(iterator.this_arg); 1545 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1546 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1547 break; 1548 1549 /* 1550 * Please update the file 1551 * Documentation/networking/mac80211-injection.txt 1552 * when parsing new fields here. 1553 */ 1554 1555 default: 1556 break; 1557 } 1558 } 1559 1560 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1561 return false; 1562 1563 /* 1564 * remove the radiotap header 1565 * iterator->_max_length was sanity-checked against 1566 * skb->len by iterator init 1567 */ 1568 skb_pull(skb, iterator._max_length); 1569 1570 return true; 1571 } 1572 1573 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1574 struct net_device *dev) 1575 { 1576 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1577 struct ieee80211_channel *chan = local->hw.conf.channel; 1578 struct ieee80211_radiotap_header *prthdr = 1579 (struct ieee80211_radiotap_header *)skb->data; 1580 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1581 struct ieee80211_hdr *hdr; 1582 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1583 u16 len_rthdr; 1584 int hdrlen; 1585 1586 /* 1587 * Frame injection is not allowed if beaconing is not allowed 1588 * or if we need radar detection. Beaconing is usually not allowed when 1589 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1590 * Passive scan is also used in world regulatory domains where 1591 * your country is not known and as such it should be treated as 1592 * NO TX unless the channel is explicitly allowed in which case 1593 * your current regulatory domain would not have the passive scan 1594 * flag. 1595 * 1596 * Since AP mode uses monitor interfaces to inject/TX management 1597 * frames we can make AP mode the exception to this rule once it 1598 * supports radar detection as its implementation can deal with 1599 * radar detection by itself. We can do that later by adding a 1600 * monitor flag interfaces used for AP support. 1601 */ 1602 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1603 IEEE80211_CHAN_PASSIVE_SCAN))) 1604 goto fail; 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 ieee80211_xmit(sdata, skb); 1692 rcu_read_unlock(); 1693 1694 return NETDEV_TX_OK; 1695 1696 fail: 1697 dev_kfree_skb(skb); 1698 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1699 } 1700 1701 /** 1702 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1703 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1704 * @skb: packet to be sent 1705 * @dev: incoming interface 1706 * 1707 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1708 * not be freed, and caller is responsible for either retrying later or freeing 1709 * skb). 1710 * 1711 * This function takes in an Ethernet header and encapsulates it with suitable 1712 * IEEE 802.11 header based on which interface the packet is coming in. The 1713 * encapsulated packet will then be passed to master interface, wlan#.11, for 1714 * transmission (through low-level driver). 1715 */ 1716 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1717 struct net_device *dev) 1718 { 1719 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1720 struct ieee80211_local *local = sdata->local; 1721 struct ieee80211_tx_info *info; 1722 int head_need; 1723 u16 ethertype, hdrlen, meshhdrlen = 0; 1724 __le16 fc; 1725 struct ieee80211_hdr hdr; 1726 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1727 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1728 const u8 *encaps_data; 1729 int encaps_len, skip_header_bytes; 1730 int nh_pos, h_pos; 1731 struct sta_info *sta = NULL; 1732 bool wme_sta = false, authorized = false, tdls_auth = false; 1733 bool tdls_direct = false; 1734 bool multicast; 1735 u32 info_flags = 0; 1736 u16 info_id = 0; 1737 1738 if (unlikely(skb->len < ETH_HLEN)) 1739 goto fail; 1740 1741 /* convert Ethernet header to proper 802.11 header (based on 1742 * operation mode) */ 1743 ethertype = (skb->data[12] << 8) | skb->data[13]; 1744 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1745 1746 switch (sdata->vif.type) { 1747 case NL80211_IFTYPE_AP_VLAN: 1748 rcu_read_lock(); 1749 sta = rcu_dereference(sdata->u.vlan.sta); 1750 if (sta) { 1751 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1752 /* RA TA DA SA */ 1753 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1754 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1755 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1756 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1757 hdrlen = 30; 1758 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1759 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1760 } 1761 rcu_read_unlock(); 1762 if (sta) 1763 break; 1764 /* fall through */ 1765 case NL80211_IFTYPE_AP: 1766 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1767 /* DA BSSID SA */ 1768 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1769 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1770 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1771 hdrlen = 24; 1772 break; 1773 case NL80211_IFTYPE_WDS: 1774 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1775 /* RA TA DA SA */ 1776 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1777 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1778 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1779 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1780 hdrlen = 30; 1781 break; 1782 #ifdef CONFIG_MAC80211_MESH 1783 case NL80211_IFTYPE_MESH_POINT: 1784 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1785 /* Do not send frames with mesh_ttl == 0 */ 1786 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1787 goto fail; 1788 } 1789 rcu_read_lock(); 1790 if (!is_multicast_ether_addr(skb->data)) { 1791 mpath = mesh_path_lookup(skb->data, sdata); 1792 if (!mpath) 1793 mppath = mpp_path_lookup(skb->data, sdata); 1794 } 1795 1796 /* 1797 * Use address extension if it is a packet from 1798 * another interface or if we know the destination 1799 * is being proxied by a portal (i.e. portal address 1800 * differs from proxied address) 1801 */ 1802 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1803 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1804 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1805 skb->data, skb->data + ETH_ALEN); 1806 rcu_read_unlock(); 1807 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1808 sdata, NULL, NULL); 1809 } else { 1810 /* DS -> MBSS (802.11-2012 13.11.3.3). 1811 * For unicast with unknown forwarding information, 1812 * destination might be in the MBSS or if that fails 1813 * forwarded to another mesh gate. In either case 1814 * resolution will be handled in ieee80211_xmit(), so 1815 * leave the original DA. This also works for mcast */ 1816 const u8 *mesh_da = skb->data; 1817 1818 if (mppath) 1819 mesh_da = mppath->mpp; 1820 else if (mpath) 1821 mesh_da = mpath->dst; 1822 rcu_read_unlock(); 1823 1824 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1825 mesh_da, sdata->vif.addr); 1826 if (is_multicast_ether_addr(mesh_da)) 1827 /* DA TA mSA AE:SA */ 1828 meshhdrlen = 1829 ieee80211_new_mesh_header(&mesh_hdr, 1830 sdata, 1831 skb->data + ETH_ALEN, 1832 NULL); 1833 else 1834 /* RA TA mDA mSA AE:DA SA */ 1835 meshhdrlen = 1836 ieee80211_new_mesh_header(&mesh_hdr, 1837 sdata, 1838 skb->data, 1839 skb->data + ETH_ALEN); 1840 1841 } 1842 break; 1843 #endif 1844 case NL80211_IFTYPE_STATION: 1845 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1846 bool tdls_peer = false; 1847 1848 rcu_read_lock(); 1849 sta = sta_info_get(sdata, skb->data); 1850 if (sta) { 1851 authorized = test_sta_flag(sta, 1852 WLAN_STA_AUTHORIZED); 1853 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1854 tdls_peer = test_sta_flag(sta, 1855 WLAN_STA_TDLS_PEER); 1856 tdls_auth = test_sta_flag(sta, 1857 WLAN_STA_TDLS_PEER_AUTH); 1858 } 1859 rcu_read_unlock(); 1860 1861 /* 1862 * If the TDLS link is enabled, send everything 1863 * directly. Otherwise, allow TDLS setup frames 1864 * to be transmitted indirectly. 1865 */ 1866 tdls_direct = tdls_peer && (tdls_auth || 1867 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1868 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1869 } 1870 1871 if (tdls_direct) { 1872 /* link during setup - throw out frames to peer */ 1873 if (!tdls_auth) 1874 goto fail; 1875 1876 /* DA SA BSSID */ 1877 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1878 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1879 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1880 hdrlen = 24; 1881 } else if (sdata->u.mgd.use_4addr && 1882 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1883 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1884 IEEE80211_FCTL_TODS); 1885 /* RA TA DA SA */ 1886 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1887 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1888 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1889 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1890 hdrlen = 30; 1891 } else { 1892 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1893 /* BSSID SA DA */ 1894 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1895 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1896 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1897 hdrlen = 24; 1898 } 1899 break; 1900 case NL80211_IFTYPE_ADHOC: 1901 /* DA SA BSSID */ 1902 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1903 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1904 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1905 hdrlen = 24; 1906 break; 1907 default: 1908 goto fail; 1909 } 1910 1911 /* 1912 * There's no need to try to look up the destination 1913 * if it is a multicast address (which can only happen 1914 * in AP mode) 1915 */ 1916 multicast = is_multicast_ether_addr(hdr.addr1); 1917 if (!multicast) { 1918 rcu_read_lock(); 1919 sta = sta_info_get(sdata, hdr.addr1); 1920 if (sta) { 1921 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1922 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1923 } 1924 rcu_read_unlock(); 1925 } 1926 1927 /* For mesh, the use of the QoS header is mandatory */ 1928 if (ieee80211_vif_is_mesh(&sdata->vif)) 1929 wme_sta = true; 1930 1931 /* receiver and we are QoS enabled, use a QoS type frame */ 1932 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1933 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1934 hdrlen += 2; 1935 } 1936 1937 /* 1938 * Drop unicast frames to unauthorised stations unless they are 1939 * EAPOL frames from the local station. 1940 */ 1941 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1942 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1943 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1944 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1945 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1946 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 1947 dev->name, hdr.addr1); 1948 #endif 1949 1950 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1951 1952 goto fail; 1953 } 1954 1955 if (unlikely(!multicast && skb->sk && 1956 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1957 struct sk_buff *orig_skb = skb; 1958 1959 skb = skb_clone(skb, GFP_ATOMIC); 1960 if (skb) { 1961 unsigned long flags; 1962 int id, r; 1963 1964 spin_lock_irqsave(&local->ack_status_lock, flags); 1965 r = idr_get_new_above(&local->ack_status_frames, 1966 orig_skb, 1, &id); 1967 if (r == -EAGAIN) { 1968 idr_pre_get(&local->ack_status_frames, 1969 GFP_ATOMIC); 1970 r = idr_get_new_above(&local->ack_status_frames, 1971 orig_skb, 1, &id); 1972 } 1973 if (WARN_ON(!id) || id > 0xffff) { 1974 idr_remove(&local->ack_status_frames, id); 1975 r = -ERANGE; 1976 } 1977 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1978 1979 if (!r) { 1980 info_id = id; 1981 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1982 } else if (skb_shared(skb)) { 1983 kfree_skb(orig_skb); 1984 } else { 1985 kfree_skb(skb); 1986 skb = orig_skb; 1987 } 1988 } else { 1989 /* couldn't clone -- lose tx status ... */ 1990 skb = orig_skb; 1991 } 1992 } 1993 1994 /* 1995 * If the skb is shared we need to obtain our own copy. 1996 */ 1997 if (skb_shared(skb)) { 1998 struct sk_buff *tmp_skb = skb; 1999 2000 /* can't happen -- skb is a clone if info_id != 0 */ 2001 WARN_ON(info_id); 2002 2003 skb = skb_clone(skb, GFP_ATOMIC); 2004 kfree_skb(tmp_skb); 2005 2006 if (!skb) 2007 goto fail; 2008 } 2009 2010 hdr.frame_control = fc; 2011 hdr.duration_id = 0; 2012 hdr.seq_ctrl = 0; 2013 2014 skip_header_bytes = ETH_HLEN; 2015 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2016 encaps_data = bridge_tunnel_header; 2017 encaps_len = sizeof(bridge_tunnel_header); 2018 skip_header_bytes -= 2; 2019 } else if (ethertype >= 0x600) { 2020 encaps_data = rfc1042_header; 2021 encaps_len = sizeof(rfc1042_header); 2022 skip_header_bytes -= 2; 2023 } else { 2024 encaps_data = NULL; 2025 encaps_len = 0; 2026 } 2027 2028 nh_pos = skb_network_header(skb) - skb->data; 2029 h_pos = skb_transport_header(skb) - skb->data; 2030 2031 skb_pull(skb, skip_header_bytes); 2032 nh_pos -= skip_header_bytes; 2033 h_pos -= skip_header_bytes; 2034 2035 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2036 2037 /* 2038 * So we need to modify the skb header and hence need a copy of 2039 * that. The head_need variable above doesn't, so far, include 2040 * the needed header space that we don't need right away. If we 2041 * can, then we don't reallocate right now but only after the 2042 * frame arrives at the master device (if it does...) 2043 * 2044 * If we cannot, however, then we will reallocate to include all 2045 * the ever needed space. Also, if we need to reallocate it anyway, 2046 * make it big enough for everything we may ever need. 2047 */ 2048 2049 if (head_need > 0 || skb_cloned(skb)) { 2050 head_need += IEEE80211_ENCRYPT_HEADROOM; 2051 head_need += local->tx_headroom; 2052 head_need = max_t(int, 0, head_need); 2053 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2054 ieee80211_free_txskb(&local->hw, skb); 2055 return NETDEV_TX_OK; 2056 } 2057 } 2058 2059 if (encaps_data) { 2060 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2061 nh_pos += encaps_len; 2062 h_pos += encaps_len; 2063 } 2064 2065 #ifdef CONFIG_MAC80211_MESH 2066 if (meshhdrlen > 0) { 2067 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2068 nh_pos += meshhdrlen; 2069 h_pos += meshhdrlen; 2070 } 2071 #endif 2072 2073 if (ieee80211_is_data_qos(fc)) { 2074 __le16 *qos_control; 2075 2076 qos_control = (__le16*) skb_push(skb, 2); 2077 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2078 /* 2079 * Maybe we could actually set some fields here, for now just 2080 * initialise to zero to indicate no special operation. 2081 */ 2082 *qos_control = 0; 2083 } else 2084 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2085 2086 nh_pos += hdrlen; 2087 h_pos += hdrlen; 2088 2089 dev->stats.tx_packets++; 2090 dev->stats.tx_bytes += skb->len; 2091 2092 /* Update skb pointers to various headers since this modified frame 2093 * is going to go through Linux networking code that may potentially 2094 * need things like pointer to IP header. */ 2095 skb_set_mac_header(skb, 0); 2096 skb_set_network_header(skb, nh_pos); 2097 skb_set_transport_header(skb, h_pos); 2098 2099 info = IEEE80211_SKB_CB(skb); 2100 memset(info, 0, sizeof(*info)); 2101 2102 dev->trans_start = jiffies; 2103 2104 info->flags = info_flags; 2105 info->ack_frame_id = info_id; 2106 2107 ieee80211_xmit(sdata, skb); 2108 2109 return NETDEV_TX_OK; 2110 2111 fail: 2112 dev_kfree_skb(skb); 2113 return NETDEV_TX_OK; 2114 } 2115 2116 2117 /* 2118 * ieee80211_clear_tx_pending may not be called in a context where 2119 * it is possible that it packets could come in again. 2120 */ 2121 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2122 { 2123 struct sk_buff *skb; 2124 int i; 2125 2126 for (i = 0; i < local->hw.queues; i++) { 2127 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2128 ieee80211_free_txskb(&local->hw, skb); 2129 } 2130 } 2131 2132 /* 2133 * Returns false if the frame couldn't be transmitted but was queued instead, 2134 * which in this case means re-queued -- take as an indication to stop sending 2135 * more pending frames. 2136 */ 2137 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2138 struct sk_buff *skb) 2139 { 2140 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2141 struct ieee80211_sub_if_data *sdata; 2142 struct sta_info *sta; 2143 struct ieee80211_hdr *hdr; 2144 bool result; 2145 2146 sdata = vif_to_sdata(info->control.vif); 2147 2148 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2149 result = ieee80211_tx(sdata, skb, true); 2150 } else { 2151 struct sk_buff_head skbs; 2152 2153 __skb_queue_head_init(&skbs); 2154 __skb_queue_tail(&skbs, skb); 2155 2156 hdr = (struct ieee80211_hdr *)skb->data; 2157 sta = sta_info_get(sdata, hdr->addr1); 2158 2159 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2160 } 2161 2162 return result; 2163 } 2164 2165 /* 2166 * Transmit all pending packets. Called from tasklet. 2167 */ 2168 void ieee80211_tx_pending(unsigned long data) 2169 { 2170 struct ieee80211_local *local = (struct ieee80211_local *)data; 2171 unsigned long flags; 2172 int i; 2173 bool txok; 2174 2175 rcu_read_lock(); 2176 2177 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2178 for (i = 0; i < local->hw.queues; i++) { 2179 /* 2180 * If queue is stopped by something other than due to pending 2181 * frames, or we have no pending frames, proceed to next queue. 2182 */ 2183 if (local->queue_stop_reasons[i] || 2184 skb_queue_empty(&local->pending[i])) 2185 continue; 2186 2187 while (!skb_queue_empty(&local->pending[i])) { 2188 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2189 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2190 2191 if (WARN_ON(!info->control.vif)) { 2192 ieee80211_free_txskb(&local->hw, skb); 2193 continue; 2194 } 2195 2196 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2197 flags); 2198 2199 txok = ieee80211_tx_pending_skb(local, skb); 2200 spin_lock_irqsave(&local->queue_stop_reason_lock, 2201 flags); 2202 if (!txok) 2203 break; 2204 } 2205 2206 if (skb_queue_empty(&local->pending[i])) 2207 ieee80211_propagate_queue_wake(local, i); 2208 } 2209 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2210 2211 rcu_read_unlock(); 2212 } 2213 2214 /* functions for drivers to get certain frames */ 2215 2216 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2217 struct ieee80211_if_ap *bss, 2218 struct sk_buff *skb, 2219 struct beacon_data *beacon) 2220 { 2221 u8 *pos, *tim; 2222 int aid0 = 0; 2223 int i, have_bits = 0, n1, n2; 2224 2225 /* Generate bitmap for TIM only if there are any STAs in power save 2226 * mode. */ 2227 if (atomic_read(&bss->num_sta_ps) > 0) 2228 /* in the hope that this is faster than 2229 * checking byte-for-byte */ 2230 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2231 IEEE80211_MAX_AID+1); 2232 2233 if (bss->dtim_count == 0) 2234 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2235 else 2236 bss->dtim_count--; 2237 2238 tim = pos = (u8 *) skb_put(skb, 6); 2239 *pos++ = WLAN_EID_TIM; 2240 *pos++ = 4; 2241 *pos++ = bss->dtim_count; 2242 *pos++ = sdata->vif.bss_conf.dtim_period; 2243 2244 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2245 aid0 = 1; 2246 2247 bss->dtim_bc_mc = aid0 == 1; 2248 2249 if (have_bits) { 2250 /* Find largest even number N1 so that bits numbered 1 through 2251 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2252 * (N2 + 1) x 8 through 2007 are 0. */ 2253 n1 = 0; 2254 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2255 if (bss->tim[i]) { 2256 n1 = i & 0xfe; 2257 break; 2258 } 2259 } 2260 n2 = n1; 2261 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2262 if (bss->tim[i]) { 2263 n2 = i; 2264 break; 2265 } 2266 } 2267 2268 /* Bitmap control */ 2269 *pos++ = n1 | aid0; 2270 /* Part Virt Bitmap */ 2271 skb_put(skb, n2 - n1); 2272 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2273 2274 tim[1] = n2 - n1 + 4; 2275 } else { 2276 *pos++ = aid0; /* Bitmap control */ 2277 *pos++ = 0; /* Part Virt Bitmap */ 2278 } 2279 } 2280 2281 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2282 struct ieee80211_vif *vif, 2283 u16 *tim_offset, u16 *tim_length) 2284 { 2285 struct ieee80211_local *local = hw_to_local(hw); 2286 struct sk_buff *skb = NULL; 2287 struct ieee80211_tx_info *info; 2288 struct ieee80211_sub_if_data *sdata = NULL; 2289 struct ieee80211_if_ap *ap = NULL; 2290 struct beacon_data *beacon; 2291 enum ieee80211_band band = local->oper_channel->band; 2292 struct ieee80211_tx_rate_control txrc; 2293 2294 rcu_read_lock(); 2295 2296 sdata = vif_to_sdata(vif); 2297 2298 if (!ieee80211_sdata_running(sdata)) 2299 goto out; 2300 2301 if (tim_offset) 2302 *tim_offset = 0; 2303 if (tim_length) 2304 *tim_length = 0; 2305 2306 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2307 ap = &sdata->u.ap; 2308 beacon = rcu_dereference(ap->beacon); 2309 if (beacon) { 2310 /* 2311 * headroom, head length, 2312 * tail length and maximum TIM length 2313 */ 2314 skb = dev_alloc_skb(local->tx_headroom + 2315 beacon->head_len + 2316 beacon->tail_len + 256); 2317 if (!skb) 2318 goto out; 2319 2320 skb_reserve(skb, local->tx_headroom); 2321 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2322 beacon->head_len); 2323 2324 /* 2325 * Not very nice, but we want to allow the driver to call 2326 * ieee80211_beacon_get() as a response to the set_tim() 2327 * callback. That, however, is already invoked under the 2328 * sta_lock to guarantee consistent and race-free update 2329 * of the tim bitmap in mac80211 and the driver. 2330 */ 2331 if (local->tim_in_locked_section) { 2332 ieee80211_beacon_add_tim(sdata, ap, skb, 2333 beacon); 2334 } else { 2335 unsigned long flags; 2336 2337 spin_lock_irqsave(&local->tim_lock, flags); 2338 ieee80211_beacon_add_tim(sdata, ap, skb, 2339 beacon); 2340 spin_unlock_irqrestore(&local->tim_lock, flags); 2341 } 2342 2343 if (tim_offset) 2344 *tim_offset = beacon->head_len; 2345 if (tim_length) 2346 *tim_length = skb->len - beacon->head_len; 2347 2348 if (beacon->tail) 2349 memcpy(skb_put(skb, beacon->tail_len), 2350 beacon->tail, beacon->tail_len); 2351 } else 2352 goto out; 2353 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2354 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2355 struct ieee80211_hdr *hdr; 2356 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2357 2358 if (!presp) 2359 goto out; 2360 2361 skb = skb_copy(presp, GFP_ATOMIC); 2362 if (!skb) 2363 goto out; 2364 2365 hdr = (struct ieee80211_hdr *) skb->data; 2366 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2367 IEEE80211_STYPE_BEACON); 2368 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2369 struct ieee80211_mgmt *mgmt; 2370 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2371 u8 *pos; 2372 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2373 sizeof(mgmt->u.beacon); 2374 2375 #ifdef CONFIG_MAC80211_MESH 2376 if (!sdata->u.mesh.mesh_id_len) 2377 goto out; 2378 #endif 2379 2380 if (ifmsh->sync_ops) 2381 ifmsh->sync_ops->adjust_tbtt( 2382 sdata); 2383 2384 skb = dev_alloc_skb(local->tx_headroom + 2385 hdr_len + 2386 2 + /* NULL SSID */ 2387 2 + 8 + /* supported rates */ 2388 2 + 3 + /* DS params */ 2389 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2390 2 + sizeof(struct ieee80211_ht_cap) + 2391 2 + sizeof(struct ieee80211_ht_operation) + 2392 2 + sdata->u.mesh.mesh_id_len + 2393 2 + sizeof(struct ieee80211_meshconf_ie) + 2394 sdata->u.mesh.ie_len); 2395 if (!skb) 2396 goto out; 2397 2398 skb_reserve(skb, local->hw.extra_tx_headroom); 2399 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2400 memset(mgmt, 0, hdr_len); 2401 mgmt->frame_control = 2402 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2403 eth_broadcast_addr(mgmt->da); 2404 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2405 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2406 mgmt->u.beacon.beacon_int = 2407 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2408 mgmt->u.beacon.capab_info |= cpu_to_le16( 2409 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2410 2411 pos = skb_put(skb, 2); 2412 *pos++ = WLAN_EID_SSID; 2413 *pos++ = 0x0; 2414 2415 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 2416 mesh_add_ds_params_ie(skb, sdata) || 2417 ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 2418 mesh_add_rsn_ie(skb, sdata) || 2419 mesh_add_ht_cap_ie(skb, sdata) || 2420 mesh_add_ht_oper_ie(skb, sdata) || 2421 mesh_add_meshid_ie(skb, sdata) || 2422 mesh_add_meshconf_ie(skb, sdata) || 2423 mesh_add_vendor_ies(skb, sdata)) { 2424 pr_err("o11s: couldn't add ies!\n"); 2425 goto out; 2426 } 2427 } else { 2428 WARN_ON(1); 2429 goto out; 2430 } 2431 2432 info = IEEE80211_SKB_CB(skb); 2433 2434 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2435 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2436 info->band = band; 2437 2438 memset(&txrc, 0, sizeof(txrc)); 2439 txrc.hw = hw; 2440 txrc.sband = local->hw.wiphy->bands[band]; 2441 txrc.bss_conf = &sdata->vif.bss_conf; 2442 txrc.skb = skb; 2443 txrc.reported_rate.idx = -1; 2444 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2445 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2446 txrc.max_rate_idx = -1; 2447 else 2448 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2449 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2450 sizeof(txrc.rate_idx_mcs_mask)); 2451 txrc.bss = true; 2452 rate_control_get_rate(sdata, NULL, &txrc); 2453 2454 info->control.vif = vif; 2455 2456 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2457 IEEE80211_TX_CTL_ASSIGN_SEQ | 2458 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2459 out: 2460 rcu_read_unlock(); 2461 return skb; 2462 } 2463 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2464 2465 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2466 struct ieee80211_vif *vif) 2467 { 2468 struct ieee80211_if_ap *ap = NULL; 2469 struct sk_buff *skb = NULL; 2470 struct probe_resp *presp = NULL; 2471 struct ieee80211_hdr *hdr; 2472 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2473 2474 if (sdata->vif.type != NL80211_IFTYPE_AP) 2475 return NULL; 2476 2477 rcu_read_lock(); 2478 2479 ap = &sdata->u.ap; 2480 presp = rcu_dereference(ap->probe_resp); 2481 if (!presp) 2482 goto out; 2483 2484 skb = dev_alloc_skb(presp->len); 2485 if (!skb) 2486 goto out; 2487 2488 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2489 2490 hdr = (struct ieee80211_hdr *) skb->data; 2491 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2492 2493 out: 2494 rcu_read_unlock(); 2495 return skb; 2496 } 2497 EXPORT_SYMBOL(ieee80211_proberesp_get); 2498 2499 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2500 struct ieee80211_vif *vif) 2501 { 2502 struct ieee80211_sub_if_data *sdata; 2503 struct ieee80211_if_managed *ifmgd; 2504 struct ieee80211_pspoll *pspoll; 2505 struct ieee80211_local *local; 2506 struct sk_buff *skb; 2507 2508 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2509 return NULL; 2510 2511 sdata = vif_to_sdata(vif); 2512 ifmgd = &sdata->u.mgd; 2513 local = sdata->local; 2514 2515 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2516 if (!skb) 2517 return NULL; 2518 2519 skb_reserve(skb, local->hw.extra_tx_headroom); 2520 2521 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2522 memset(pspoll, 0, sizeof(*pspoll)); 2523 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2524 IEEE80211_STYPE_PSPOLL); 2525 pspoll->aid = cpu_to_le16(ifmgd->aid); 2526 2527 /* aid in PS-Poll has its two MSBs each set to 1 */ 2528 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2529 2530 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2531 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2532 2533 return skb; 2534 } 2535 EXPORT_SYMBOL(ieee80211_pspoll_get); 2536 2537 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2538 struct ieee80211_vif *vif) 2539 { 2540 struct ieee80211_hdr_3addr *nullfunc; 2541 struct ieee80211_sub_if_data *sdata; 2542 struct ieee80211_if_managed *ifmgd; 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(*nullfunc)); 2554 if (!skb) 2555 return NULL; 2556 2557 skb_reserve(skb, local->hw.extra_tx_headroom); 2558 2559 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2560 sizeof(*nullfunc)); 2561 memset(nullfunc, 0, sizeof(*nullfunc)); 2562 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2563 IEEE80211_STYPE_NULLFUNC | 2564 IEEE80211_FCTL_TODS); 2565 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2566 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2567 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2568 2569 return skb; 2570 } 2571 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2572 2573 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2574 struct ieee80211_vif *vif, 2575 const u8 *ssid, size_t ssid_len, 2576 const u8 *ie, size_t ie_len) 2577 { 2578 struct ieee80211_sub_if_data *sdata; 2579 struct ieee80211_local *local; 2580 struct ieee80211_hdr_3addr *hdr; 2581 struct sk_buff *skb; 2582 size_t ie_ssid_len; 2583 u8 *pos; 2584 2585 sdata = vif_to_sdata(vif); 2586 local = sdata->local; 2587 ie_ssid_len = 2 + ssid_len; 2588 2589 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2590 ie_ssid_len + ie_len); 2591 if (!skb) 2592 return NULL; 2593 2594 skb_reserve(skb, local->hw.extra_tx_headroom); 2595 2596 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2597 memset(hdr, 0, sizeof(*hdr)); 2598 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2599 IEEE80211_STYPE_PROBE_REQ); 2600 eth_broadcast_addr(hdr->addr1); 2601 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2602 eth_broadcast_addr(hdr->addr3); 2603 2604 pos = skb_put(skb, ie_ssid_len); 2605 *pos++ = WLAN_EID_SSID; 2606 *pos++ = ssid_len; 2607 if (ssid_len) 2608 memcpy(pos, ssid, ssid_len); 2609 pos += ssid_len; 2610 2611 if (ie) { 2612 pos = skb_put(skb, ie_len); 2613 memcpy(pos, ie, ie_len); 2614 } 2615 2616 return skb; 2617 } 2618 EXPORT_SYMBOL(ieee80211_probereq_get); 2619 2620 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2621 const void *frame, size_t frame_len, 2622 const struct ieee80211_tx_info *frame_txctl, 2623 struct ieee80211_rts *rts) 2624 { 2625 const struct ieee80211_hdr *hdr = frame; 2626 2627 rts->frame_control = 2628 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2629 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2630 frame_txctl); 2631 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2632 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2633 } 2634 EXPORT_SYMBOL(ieee80211_rts_get); 2635 2636 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2637 const void *frame, size_t frame_len, 2638 const struct ieee80211_tx_info *frame_txctl, 2639 struct ieee80211_cts *cts) 2640 { 2641 const struct ieee80211_hdr *hdr = frame; 2642 2643 cts->frame_control = 2644 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2645 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2646 frame_len, frame_txctl); 2647 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2648 } 2649 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2650 2651 struct sk_buff * 2652 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2653 struct ieee80211_vif *vif) 2654 { 2655 struct ieee80211_local *local = hw_to_local(hw); 2656 struct sk_buff *skb = NULL; 2657 struct ieee80211_tx_data tx; 2658 struct ieee80211_sub_if_data *sdata; 2659 struct ieee80211_if_ap *bss = NULL; 2660 struct beacon_data *beacon; 2661 struct ieee80211_tx_info *info; 2662 2663 sdata = vif_to_sdata(vif); 2664 bss = &sdata->u.ap; 2665 2666 rcu_read_lock(); 2667 beacon = rcu_dereference(bss->beacon); 2668 2669 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2670 goto out; 2671 2672 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2673 goto out; /* send buffered bc/mc only after DTIM beacon */ 2674 2675 while (1) { 2676 skb = skb_dequeue(&bss->ps_bc_buf); 2677 if (!skb) 2678 goto out; 2679 local->total_ps_buffered--; 2680 2681 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2682 struct ieee80211_hdr *hdr = 2683 (struct ieee80211_hdr *) skb->data; 2684 /* more buffered multicast/broadcast frames ==> set 2685 * MoreData flag in IEEE 802.11 header to inform PS 2686 * STAs */ 2687 hdr->frame_control |= 2688 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2689 } 2690 2691 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2692 break; 2693 dev_kfree_skb_any(skb); 2694 } 2695 2696 info = IEEE80211_SKB_CB(skb); 2697 2698 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2699 info->band = local->oper_channel->band; 2700 2701 if (invoke_tx_handlers(&tx)) 2702 skb = NULL; 2703 out: 2704 rcu_read_unlock(); 2705 2706 return skb; 2707 } 2708 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2709 2710 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2711 struct sk_buff *skb, int tid) 2712 { 2713 int ac = ieee802_1d_to_ac[tid & 7]; 2714 2715 skb_set_mac_header(skb, 0); 2716 skb_set_network_header(skb, 0); 2717 skb_set_transport_header(skb, 0); 2718 2719 skb_set_queue_mapping(skb, ac); 2720 skb->priority = tid; 2721 2722 /* 2723 * The other path calling ieee80211_xmit is from the tasklet, 2724 * and while we can handle concurrent transmissions locking 2725 * requirements are that we do not come into tx with bhs on. 2726 */ 2727 local_bh_disable(); 2728 ieee80211_xmit(sdata, skb); 2729 local_bh_enable(); 2730 } 2731