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 <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <asm/unaligned.h> 26 27 #include "ieee80211_i.h" 28 #include "driver-ops.h" 29 #include "led.h" 30 #include "mesh.h" 31 #include "wep.h" 32 #include "wpa.h" 33 #include "wme.h" 34 #include "rate.h" 35 36 #define IEEE80211_TX_OK 0 37 #define IEEE80211_TX_AGAIN 1 38 #define IEEE80211_TX_PENDING 2 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 51 52 /* assume HW handles this */ 53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) 54 return 0; 55 56 /* uh huh? */ 57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) 58 return 0; 59 60 sband = local->hw.wiphy->bands[tx->channel->band]; 61 txrate = &sband->bitrates[info->control.rates[0].idx]; 62 63 erp = txrate->flags & IEEE80211_RATE_ERP_G; 64 65 /* 66 * data and mgmt (except PS Poll): 67 * - during CFP: 32768 68 * - during contention period: 69 * if addr1 is group address: 0 70 * if more fragments = 0 and addr1 is individual address: time to 71 * transmit one ACK plus SIFS 72 * if more fragments = 1 and addr1 is individual address: time to 73 * transmit next fragment plus 2 x ACK plus 3 x SIFS 74 * 75 * IEEE 802.11, 9.6: 76 * - control response frame (CTS or ACK) shall be transmitted using the 77 * same rate as the immediately previous frame in the frame exchange 78 * sequence, if this rate belongs to the PHY mandatory rates, or else 79 * at the highest possible rate belonging to the PHY rates in the 80 * BSSBasicRateSet 81 */ 82 hdr = (struct ieee80211_hdr *)tx->skb->data; 83 if (ieee80211_is_ctl(hdr->frame_control)) { 84 /* TODO: These control frames are not currently sent by 85 * mac80211, but should they be implemented, this function 86 * needs to be updated to support duration field calculation. 87 * 88 * RTS: time needed to transmit pending data/mgmt frame plus 89 * one CTS frame plus one ACK frame plus 3 x SIFS 90 * CTS: duration of immediately previous RTS minus time 91 * required to transmit CTS and its SIFS 92 * ACK: 0 if immediately previous directed data/mgmt had 93 * more=0, with more=1 duration in ACK frame is duration 94 * from previous frame minus time needed to transmit ACK 95 * and its SIFS 96 * PS Poll: BIT(15) | BIT(14) | aid 97 */ 98 return 0; 99 } 100 101 /* data/mgmt */ 102 if (0 /* FIX: data/mgmt during CFP */) 103 return cpu_to_le16(32768); 104 105 if (group_addr) /* Group address as the destination - no ACK */ 106 return 0; 107 108 /* Individual destination address: 109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 110 * CTS and ACK frames shall be transmitted using the highest rate in 111 * basic rate set that is less than or equal to the rate of the 112 * immediately previous frame and that is using the same modulation 113 * (CCK or OFDM). If no basic rate set matches with these requirements, 114 * the highest mandatory rate of the PHY that is less than or equal to 115 * the rate of the previous frame is used. 116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 117 */ 118 rate = -1; 119 /* use lowest available if everything fails */ 120 mrate = sband->bitrates[0].bitrate; 121 for (i = 0; i < sband->n_bitrates; i++) { 122 struct ieee80211_rate *r = &sband->bitrates[i]; 123 124 if (r->bitrate > txrate->bitrate) 125 break; 126 127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 128 rate = r->bitrate; 129 130 switch (sband->band) { 131 case IEEE80211_BAND_2GHZ: { 132 u32 flag; 133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 134 flag = IEEE80211_RATE_MANDATORY_G; 135 else 136 flag = IEEE80211_RATE_MANDATORY_B; 137 if (r->flags & flag) 138 mrate = r->bitrate; 139 break; 140 } 141 case IEEE80211_BAND_5GHZ: 142 if (r->flags & IEEE80211_RATE_MANDATORY_A) 143 mrate = r->bitrate; 144 break; 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 /* Time needed to transmit ACK 157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 158 * to closest integer */ 159 160 dur = ieee80211_frame_duration(local, 10, rate, erp, 161 tx->sdata->vif.bss_conf.use_short_preamble); 162 163 if (next_frag_len) { 164 /* Frame is fragmented: duration increases with time needed to 165 * transmit next fragment plus ACK and 2 x SIFS. */ 166 dur *= 2; /* ACK + SIFS */ 167 /* next fragment */ 168 dur += ieee80211_frame_duration(local, next_frag_len, 169 txrate->bitrate, erp, 170 tx->sdata->vif.bss_conf.use_short_preamble); 171 } 172 173 return cpu_to_le16(dur); 174 } 175 176 static int inline is_ieee80211_device(struct ieee80211_local *local, 177 struct net_device *dev) 178 { 179 return local == wdev_priv(dev->ieee80211_ptr); 180 } 181 182 /* tx handlers */ 183 static ieee80211_tx_result debug_noinline 184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 185 { 186 struct ieee80211_local *local = tx->local; 187 struct ieee80211_if_managed *ifmgd; 188 189 /* driver doesn't support power save */ 190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 191 return TX_CONTINUE; 192 193 /* hardware does dynamic power save */ 194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 195 return TX_CONTINUE; 196 197 /* dynamic power save disabled */ 198 if (local->hw.conf.dynamic_ps_timeout <= 0) 199 return TX_CONTINUE; 200 201 /* we are scanning, don't enable power save */ 202 if (local->scanning) 203 return TX_CONTINUE; 204 205 if (!local->ps_sdata) 206 return TX_CONTINUE; 207 208 /* No point if we're going to suspend */ 209 if (local->quiescing) 210 return TX_CONTINUE; 211 212 /* dynamic ps is supported only in managed mode */ 213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 214 return TX_CONTINUE; 215 216 ifmgd = &tx->sdata->u.mgd; 217 218 /* 219 * Don't wakeup from power save if u-apsd is enabled, voip ac has 220 * u-apsd enabled and the frame is in voip class. This effectively 221 * means that even if all access categories have u-apsd enabled, in 222 * practise u-apsd is only used with the voip ac. This is a 223 * workaround for the case when received voip class packets do not 224 * have correct qos tag for some reason, due the network or the 225 * peer application. 226 * 227 * Note: local->uapsd_queues access is racy here. If the value is 228 * changed via debugfs, user needs to reassociate manually to have 229 * everything in sync. 230 */ 231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 233 && skb_get_queue_mapping(tx->skb) == 0) 234 return TX_CONTINUE; 235 236 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 237 ieee80211_stop_queues_by_reason(&local->hw, 238 IEEE80211_QUEUE_STOP_REASON_PS); 239 ieee80211_queue_work(&local->hw, 240 &local->dynamic_ps_disable_work); 241 } 242 243 mod_timer(&local->dynamic_ps_timer, jiffies + 244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 245 246 return TX_CONTINUE; 247 } 248 249 static ieee80211_tx_result debug_noinline 250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 251 { 252 253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 255 u32 sta_flags; 256 257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 258 return TX_CONTINUE; 259 260 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && 261 !ieee80211_is_probe_req(hdr->frame_control) && 262 !ieee80211_is_nullfunc(hdr->frame_control)) 263 /* 264 * When software scanning only nullfunc frames (to notify 265 * the sleep state to the AP) and probe requests (for the 266 * active scan) are allowed, all other frames should not be 267 * sent and we should not get here, but if we do 268 * nonetheless, drop them to avoid sending them 269 * off-channel. See the link below and 270 * ieee80211_start_scan() for more. 271 * 272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 273 */ 274 return TX_DROP; 275 276 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 277 return TX_CONTINUE; 278 279 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 280 return TX_CONTINUE; 281 282 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; 283 284 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 285 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && 286 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 287 ieee80211_is_data(hdr->frame_control))) { 288 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 289 printk(KERN_DEBUG "%s: dropped data frame to not " 290 "associated station %pM\n", 291 tx->sdata->name, hdr->addr1); 292 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 293 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 294 return TX_DROP; 295 } 296 } else { 297 if (unlikely(ieee80211_is_data(hdr->frame_control) && 298 tx->local->num_sta == 0 && 299 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { 300 /* 301 * No associated STAs - no need to send multicast 302 * frames. 303 */ 304 return TX_DROP; 305 } 306 return TX_CONTINUE; 307 } 308 309 return TX_CONTINUE; 310 } 311 312 /* This function is called whenever the AP is about to exceed the maximum limit 313 * of buffered frames for power saving STAs. This situation should not really 314 * happen often during normal operation, so dropping the oldest buffered packet 315 * from each queue should be OK to make some room for new frames. */ 316 static void purge_old_ps_buffers(struct ieee80211_local *local) 317 { 318 int total = 0, purged = 0; 319 struct sk_buff *skb; 320 struct ieee80211_sub_if_data *sdata; 321 struct sta_info *sta; 322 323 /* 324 * virtual interfaces are protected by RCU 325 */ 326 rcu_read_lock(); 327 328 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 329 struct ieee80211_if_ap *ap; 330 if (sdata->vif.type != NL80211_IFTYPE_AP) 331 continue; 332 ap = &sdata->u.ap; 333 skb = skb_dequeue(&ap->ps_bc_buf); 334 if (skb) { 335 purged++; 336 dev_kfree_skb(skb); 337 } 338 total += skb_queue_len(&ap->ps_bc_buf); 339 } 340 341 list_for_each_entry_rcu(sta, &local->sta_list, list) { 342 skb = skb_dequeue(&sta->ps_tx_buf); 343 if (skb) { 344 purged++; 345 dev_kfree_skb(skb); 346 } 347 total += skb_queue_len(&sta->ps_tx_buf); 348 } 349 350 rcu_read_unlock(); 351 352 local->total_ps_buffered = total; 353 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 354 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", 355 wiphy_name(local->hw.wiphy), purged); 356 #endif 357 } 358 359 static ieee80211_tx_result 360 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 361 { 362 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 364 365 /* 366 * broadcast/multicast frame 367 * 368 * If any of the associated stations is in power save mode, 369 * the frame is buffered to be sent after DTIM beacon frame. 370 * This is done either by the hardware or us. 371 */ 372 373 /* powersaving STAs only in AP/VLAN mode */ 374 if (!tx->sdata->bss) 375 return TX_CONTINUE; 376 377 /* no buffering for ordered frames */ 378 if (ieee80211_has_order(hdr->frame_control)) 379 return TX_CONTINUE; 380 381 /* no stations in PS mode */ 382 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 383 return TX_CONTINUE; 384 385 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 386 387 /* device releases frame after DTIM beacon */ 388 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 389 return TX_CONTINUE; 390 391 /* buffered in mac80211 */ 392 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 393 purge_old_ps_buffers(tx->local); 394 395 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 396 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 397 if (net_ratelimit()) 398 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", 399 tx->sdata->name); 400 #endif 401 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 402 } else 403 tx->local->total_ps_buffered++; 404 405 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 406 407 return TX_QUEUED; 408 } 409 410 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 411 struct sk_buff *skb) 412 { 413 if (!ieee80211_is_mgmt(fc)) 414 return 0; 415 416 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) 417 return 0; 418 419 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 420 skb->data)) 421 return 0; 422 423 return 1; 424 } 425 426 static ieee80211_tx_result 427 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 428 { 429 struct sta_info *sta = tx->sta; 430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 431 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 432 u32 staflags; 433 434 if (unlikely(!sta || 435 ieee80211_is_probe_resp(hdr->frame_control) || 436 ieee80211_is_auth(hdr->frame_control) || 437 ieee80211_is_assoc_resp(hdr->frame_control) || 438 ieee80211_is_reassoc_resp(hdr->frame_control))) 439 return TX_CONTINUE; 440 441 staflags = get_sta_flags(sta); 442 443 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) && 444 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { 445 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 446 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " 447 "before %d)\n", 448 sta->sta.addr, sta->sta.aid, 449 skb_queue_len(&sta->ps_tx_buf)); 450 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 451 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 452 purge_old_ps_buffers(tx->local); 453 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { 454 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); 455 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 456 if (net_ratelimit()) { 457 printk(KERN_DEBUG "%s: STA %pM TX " 458 "buffer full - dropping oldest frame\n", 459 tx->sdata->name, sta->sta.addr); 460 } 461 #endif 462 dev_kfree_skb(old); 463 } else 464 tx->local->total_ps_buffered++; 465 466 /* 467 * Queue frame to be sent after STA wakes up/polls, 468 * but don't set the TIM bit if the driver is blocking 469 * wakeup or poll response transmissions anyway. 470 */ 471 if (skb_queue_empty(&sta->ps_tx_buf) && 472 !(staflags & WLAN_STA_PS_DRIVER)) 473 sta_info_set_tim_bit(sta); 474 475 info->control.jiffies = jiffies; 476 info->control.vif = &tx->sdata->vif; 477 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 478 skb_queue_tail(&sta->ps_tx_buf, tx->skb); 479 return TX_QUEUED; 480 } 481 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 482 else if (unlikely(staflags & WLAN_STA_PS_STA)) { 483 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " 484 "set -> send frame\n", tx->sdata->name, 485 sta->sta.addr); 486 } 487 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 488 489 return TX_CONTINUE; 490 } 491 492 static ieee80211_tx_result debug_noinline 493 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 494 { 495 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 496 return TX_CONTINUE; 497 498 if (tx->flags & IEEE80211_TX_UNICAST) 499 return ieee80211_tx_h_unicast_ps_buf(tx); 500 else 501 return ieee80211_tx_h_multicast_ps_buf(tx); 502 } 503 504 static ieee80211_tx_result debug_noinline 505 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 506 { 507 struct ieee80211_key *key = NULL; 508 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 509 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 510 511 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 512 tx->key = NULL; 513 else if (tx->sta && (key = rcu_dereference(tx->sta->key))) 514 tx->key = key; 515 else if (ieee80211_is_mgmt(hdr->frame_control) && 516 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 517 tx->key = key; 518 else if ((key = rcu_dereference(tx->sdata->default_key))) 519 tx->key = key; 520 else if (tx->sdata->drop_unencrypted && 521 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) && 522 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 523 (!ieee80211_is_robust_mgmt_frame(hdr) || 524 (ieee80211_is_action(hdr->frame_control) && 525 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { 526 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 527 return TX_DROP; 528 } else 529 tx->key = NULL; 530 531 if (tx->key) { 532 bool skip_hw = false; 533 534 tx->key->tx_rx_count++; 535 /* TODO: add threshold stuff again */ 536 537 switch (tx->key->conf.alg) { 538 case ALG_WEP: 539 if (ieee80211_is_auth(hdr->frame_control)) 540 break; 541 case ALG_TKIP: 542 if (!ieee80211_is_data_present(hdr->frame_control)) 543 tx->key = NULL; 544 break; 545 case ALG_CCMP: 546 if (!ieee80211_is_data_present(hdr->frame_control) && 547 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 548 tx->skb)) 549 tx->key = NULL; 550 else 551 skip_hw = (tx->key->conf.flags & 552 IEEE80211_KEY_FLAG_SW_MGMT) && 553 ieee80211_is_mgmt(hdr->frame_control); 554 break; 555 case ALG_AES_CMAC: 556 if (!ieee80211_is_mgmt(hdr->frame_control)) 557 tx->key = NULL; 558 break; 559 } 560 561 if (!skip_hw && tx->key && 562 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 563 info->control.hw_key = &tx->key->conf; 564 } 565 566 return TX_CONTINUE; 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_sta(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (tx->sta && tx->sta->uploaded) 575 info->control.sta = &tx->sta->sta; 576 577 return TX_CONTINUE; 578 } 579 580 static ieee80211_tx_result debug_noinline 581 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 582 { 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 585 struct ieee80211_supported_band *sband; 586 struct ieee80211_rate *rate; 587 int i, len; 588 bool inval = false, rts = false, short_preamble = false; 589 struct ieee80211_tx_rate_control txrc; 590 u32 sta_flags; 591 592 memset(&txrc, 0, sizeof(txrc)); 593 594 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 595 596 len = min_t(int, tx->skb->len + FCS_LEN, 597 tx->local->hw.wiphy->frag_threshold); 598 599 /* set up the tx rate control struct we give the RC algo */ 600 txrc.hw = local_to_hw(tx->local); 601 txrc.sband = sband; 602 txrc.bss_conf = &tx->sdata->vif.bss_conf; 603 txrc.skb = tx->skb; 604 txrc.reported_rate.idx = -1; 605 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 606 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 607 txrc.max_rate_idx = -1; 608 else 609 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 610 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP; 611 612 /* set up RTS protection if desired */ 613 if (len > tx->local->hw.wiphy->rts_threshold) { 614 txrc.rts = rts = true; 615 } 616 617 /* 618 * Use short preamble if the BSS can handle it, but not for 619 * management frames unless we know the receiver can handle 620 * that -- the management frame might be to a station that 621 * just wants a probe response. 622 */ 623 if (tx->sdata->vif.bss_conf.use_short_preamble && 624 (ieee80211_is_data(hdr->frame_control) || 625 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 626 txrc.short_preamble = short_preamble = true; 627 628 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; 629 630 /* 631 * Lets not bother rate control if we're associated and cannot 632 * talk to the sta. This should not happen. 633 */ 634 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && 635 (sta_flags & WLAN_STA_ASSOC) && 636 !rate_usable_index_exists(sband, &tx->sta->sta), 637 "%s: Dropped data frame as no usable bitrate found while " 638 "scanning and associated. Target station: " 639 "%pM on %d GHz band\n", 640 tx->sdata->name, hdr->addr1, 641 tx->channel->band ? 5 : 2)) 642 return TX_DROP; 643 644 /* 645 * If we're associated with the sta at this point we know we can at 646 * least send the frame at the lowest bit rate. 647 */ 648 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 649 650 if (unlikely(info->control.rates[0].idx < 0)) 651 return TX_DROP; 652 653 if (txrc.reported_rate.idx < 0) 654 txrc.reported_rate = info->control.rates[0]; 655 656 if (tx->sta) 657 tx->sta->last_tx_rate = txrc.reported_rate; 658 659 if (unlikely(!info->control.rates[0].count)) 660 info->control.rates[0].count = 1; 661 662 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 663 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 664 info->control.rates[0].count = 1; 665 666 if (is_multicast_ether_addr(hdr->addr1)) { 667 /* 668 * XXX: verify the rate is in the basic rateset 669 */ 670 return TX_CONTINUE; 671 } 672 673 /* 674 * set up the RTS/CTS rate as the fastest basic rate 675 * that is not faster than the data rate 676 * 677 * XXX: Should this check all retry rates? 678 */ 679 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 680 s8 baserate = 0; 681 682 rate = &sband->bitrates[info->control.rates[0].idx]; 683 684 for (i = 0; i < sband->n_bitrates; i++) { 685 /* must be a basic rate */ 686 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 687 continue; 688 /* must not be faster than the data rate */ 689 if (sband->bitrates[i].bitrate > rate->bitrate) 690 continue; 691 /* maximum */ 692 if (sband->bitrates[baserate].bitrate < 693 sband->bitrates[i].bitrate) 694 baserate = i; 695 } 696 697 info->control.rts_cts_rate_idx = baserate; 698 } 699 700 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 701 /* 702 * make sure there's no valid rate following 703 * an invalid one, just in case drivers don't 704 * take the API seriously to stop at -1. 705 */ 706 if (inval) { 707 info->control.rates[i].idx = -1; 708 continue; 709 } 710 if (info->control.rates[i].idx < 0) { 711 inval = true; 712 continue; 713 } 714 715 /* 716 * For now assume MCS is already set up correctly, this 717 * needs to be fixed. 718 */ 719 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 720 WARN_ON(info->control.rates[i].idx > 76); 721 continue; 722 } 723 724 /* set up RTS protection if desired */ 725 if (rts) 726 info->control.rates[i].flags |= 727 IEEE80211_TX_RC_USE_RTS_CTS; 728 729 /* RC is busted */ 730 if (WARN_ON_ONCE(info->control.rates[i].idx >= 731 sband->n_bitrates)) { 732 info->control.rates[i].idx = -1; 733 continue; 734 } 735 736 rate = &sband->bitrates[info->control.rates[i].idx]; 737 738 /* set up short preamble */ 739 if (short_preamble && 740 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 741 info->control.rates[i].flags |= 742 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 743 744 /* set up G protection */ 745 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 746 rate->flags & IEEE80211_RATE_ERP_G) 747 info->control.rates[i].flags |= 748 IEEE80211_TX_RC_USE_CTS_PROTECT; 749 } 750 751 return TX_CONTINUE; 752 } 753 754 static ieee80211_tx_result debug_noinline 755 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 756 { 757 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 758 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 759 u16 *seq; 760 u8 *qc; 761 int tid; 762 763 /* 764 * Packet injection may want to control the sequence 765 * number, if we have no matching interface then we 766 * neither assign one ourselves nor ask the driver to. 767 */ 768 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 769 return TX_CONTINUE; 770 771 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 772 return TX_CONTINUE; 773 774 if (ieee80211_hdrlen(hdr->frame_control) < 24) 775 return TX_CONTINUE; 776 777 /* 778 * Anything but QoS data that has a sequence number field 779 * (is long enough) gets a sequence number from the global 780 * counter. 781 */ 782 if (!ieee80211_is_data_qos(hdr->frame_control)) { 783 /* driver should assign sequence number */ 784 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 785 /* for pure STA mode without beacons, we can do it */ 786 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 787 tx->sdata->sequence_number += 0x10; 788 return TX_CONTINUE; 789 } 790 791 /* 792 * This should be true for injected/management frames only, for 793 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 794 * above since they are not QoS-data frames. 795 */ 796 if (!tx->sta) 797 return TX_CONTINUE; 798 799 /* include per-STA, per-TID sequence counter */ 800 801 qc = ieee80211_get_qos_ctl(hdr); 802 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 803 seq = &tx->sta->tid_seq[tid]; 804 805 hdr->seq_ctrl = cpu_to_le16(*seq); 806 807 /* Increase the sequence number. */ 808 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 809 810 return TX_CONTINUE; 811 } 812 813 static int ieee80211_fragment(struct ieee80211_local *local, 814 struct sk_buff *skb, int hdrlen, 815 int frag_threshold) 816 { 817 struct sk_buff *tail = skb, *tmp; 818 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 819 int pos = hdrlen + per_fragm; 820 int rem = skb->len - hdrlen - per_fragm; 821 822 if (WARN_ON(rem < 0)) 823 return -EINVAL; 824 825 while (rem) { 826 int fraglen = per_fragm; 827 828 if (fraglen > rem) 829 fraglen = rem; 830 rem -= fraglen; 831 tmp = dev_alloc_skb(local->tx_headroom + 832 frag_threshold + 833 IEEE80211_ENCRYPT_HEADROOM + 834 IEEE80211_ENCRYPT_TAILROOM); 835 if (!tmp) 836 return -ENOMEM; 837 tail->next = tmp; 838 tail = tmp; 839 skb_reserve(tmp, local->tx_headroom + 840 IEEE80211_ENCRYPT_HEADROOM); 841 /* copy control information */ 842 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 843 skb_copy_queue_mapping(tmp, skb); 844 tmp->priority = skb->priority; 845 tmp->dev = skb->dev; 846 847 /* copy header and data */ 848 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 849 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 850 851 pos += fraglen; 852 } 853 854 skb->len = hdrlen + per_fragm; 855 return 0; 856 } 857 858 static ieee80211_tx_result debug_noinline 859 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 860 { 861 struct sk_buff *skb = tx->skb; 862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 863 struct ieee80211_hdr *hdr = (void *)skb->data; 864 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 865 int hdrlen; 866 int fragnum; 867 868 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) 869 return TX_CONTINUE; 870 871 /* 872 * Warn when submitting a fragmented A-MPDU frame and drop it. 873 * This scenario is handled in ieee80211_tx_prepare but extra 874 * caution taken here as fragmented ampdu may cause Tx stop. 875 */ 876 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 877 return TX_DROP; 878 879 hdrlen = ieee80211_hdrlen(hdr->frame_control); 880 881 /* internal error, why is TX_FRAGMENTED set? */ 882 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 883 return TX_DROP; 884 885 /* 886 * Now fragment the frame. This will allocate all the fragments and 887 * chain them (using skb as the first fragment) to skb->next. 888 * During transmission, we will remove the successfully transmitted 889 * fragments from this list. When the low-level driver rejects one 890 * of the fragments then we will simply pretend to accept the skb 891 * but store it away as pending. 892 */ 893 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) 894 return TX_DROP; 895 896 /* update duration/seq/flags of fragments */ 897 fragnum = 0; 898 do { 899 int next_len; 900 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 901 902 hdr = (void *)skb->data; 903 info = IEEE80211_SKB_CB(skb); 904 905 if (skb->next) { 906 hdr->frame_control |= morefrags; 907 next_len = skb->next->len; 908 /* 909 * No multi-rate retries for fragmented frames, that 910 * would completely throw off the NAV at other STAs. 911 */ 912 info->control.rates[1].idx = -1; 913 info->control.rates[2].idx = -1; 914 info->control.rates[3].idx = -1; 915 info->control.rates[4].idx = -1; 916 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 917 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 918 } else { 919 hdr->frame_control &= ~morefrags; 920 next_len = 0; 921 } 922 hdr->duration_id = ieee80211_duration(tx, 0, next_len); 923 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 924 fragnum++; 925 } while ((skb = skb->next)); 926 927 return TX_CONTINUE; 928 } 929 930 static ieee80211_tx_result debug_noinline 931 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 932 { 933 struct sk_buff *skb = tx->skb; 934 935 if (!tx->sta) 936 return TX_CONTINUE; 937 938 tx->sta->tx_packets++; 939 do { 940 tx->sta->tx_fragments++; 941 tx->sta->tx_bytes += skb->len; 942 } while ((skb = skb->next)); 943 944 return TX_CONTINUE; 945 } 946 947 static ieee80211_tx_result debug_noinline 948 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 949 { 950 if (!tx->key) 951 return TX_CONTINUE; 952 953 switch (tx->key->conf.alg) { 954 case ALG_WEP: 955 return ieee80211_crypto_wep_encrypt(tx); 956 case ALG_TKIP: 957 return ieee80211_crypto_tkip_encrypt(tx); 958 case ALG_CCMP: 959 return ieee80211_crypto_ccmp_encrypt(tx); 960 case ALG_AES_CMAC: 961 return ieee80211_crypto_aes_cmac_encrypt(tx); 962 } 963 964 /* not reached */ 965 WARN_ON(1); 966 return TX_DROP; 967 } 968 969 static ieee80211_tx_result debug_noinline 970 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 971 { 972 struct sk_buff *skb = tx->skb; 973 struct ieee80211_hdr *hdr; 974 int next_len; 975 bool group_addr; 976 977 do { 978 hdr = (void *) skb->data; 979 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 980 break; /* must not overwrite AID */ 981 next_len = skb->next ? skb->next->len : 0; 982 group_addr = is_multicast_ether_addr(hdr->addr1); 983 984 hdr->duration_id = 985 ieee80211_duration(tx, group_addr, next_len); 986 } while ((skb = skb->next)); 987 988 return TX_CONTINUE; 989 } 990 991 /* actual transmit path */ 992 993 /* 994 * deal with packet injection down monitor interface 995 * with Radiotap Header -- only called for monitor mode interface 996 */ 997 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, 998 struct sk_buff *skb) 999 { 1000 /* 1001 * this is the moment to interpret and discard the radiotap header that 1002 * must be at the start of the packet injected in Monitor mode 1003 * 1004 * Need to take some care with endian-ness since radiotap 1005 * args are little-endian 1006 */ 1007 1008 struct ieee80211_radiotap_iterator iterator; 1009 struct ieee80211_radiotap_header *rthdr = 1010 (struct ieee80211_radiotap_header *) skb->data; 1011 struct ieee80211_supported_band *sband; 1012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1013 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1014 NULL); 1015 1016 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 1017 1018 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1019 tx->flags &= ~IEEE80211_TX_FRAGMENTED; 1020 1021 /* 1022 * for every radiotap entry that is present 1023 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1024 * entries present, or -EINVAL on error) 1025 */ 1026 1027 while (!ret) { 1028 ret = ieee80211_radiotap_iterator_next(&iterator); 1029 1030 if (ret) 1031 continue; 1032 1033 /* see if this argument is something we can use */ 1034 switch (iterator.this_arg_index) { 1035 /* 1036 * You must take care when dereferencing iterator.this_arg 1037 * for multibyte types... the pointer is not aligned. Use 1038 * get_unaligned((type *)iterator.this_arg) to dereference 1039 * iterator.this_arg for type "type" safely on all arches. 1040 */ 1041 case IEEE80211_RADIOTAP_FLAGS: 1042 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1043 /* 1044 * this indicates that the skb we have been 1045 * handed has the 32-bit FCS CRC at the end... 1046 * we should react to that by snipping it off 1047 * because it will be recomputed and added 1048 * on transmission 1049 */ 1050 if (skb->len < (iterator._max_length + FCS_LEN)) 1051 return false; 1052 1053 skb_trim(skb, skb->len - FCS_LEN); 1054 } 1055 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1056 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1057 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1058 tx->flags |= IEEE80211_TX_FRAGMENTED; 1059 break; 1060 1061 /* 1062 * Please update the file 1063 * Documentation/networking/mac80211-injection.txt 1064 * when parsing new fields here. 1065 */ 1066 1067 default: 1068 break; 1069 } 1070 } 1071 1072 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1073 return false; 1074 1075 /* 1076 * remove the radiotap header 1077 * iterator->_max_length was sanity-checked against 1078 * skb->len by iterator init 1079 */ 1080 skb_pull(skb, iterator._max_length); 1081 1082 return true; 1083 } 1084 1085 /* 1086 * initialises @tx 1087 */ 1088 static ieee80211_tx_result 1089 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1090 struct ieee80211_tx_data *tx, 1091 struct sk_buff *skb) 1092 { 1093 struct ieee80211_local *local = sdata->local; 1094 struct ieee80211_hdr *hdr; 1095 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1096 int hdrlen, tid; 1097 u8 *qc, *state; 1098 bool queued = false; 1099 1100 memset(tx, 0, sizeof(*tx)); 1101 tx->skb = skb; 1102 tx->local = local; 1103 tx->sdata = sdata; 1104 tx->channel = local->hw.conf.channel; 1105 /* 1106 * Set this flag (used below to indicate "automatic fragmentation"), 1107 * it will be cleared/left by radiotap as desired. 1108 */ 1109 tx->flags |= IEEE80211_TX_FRAGMENTED; 1110 1111 /* process and remove the injection radiotap header */ 1112 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) { 1113 if (!__ieee80211_parse_tx_radiotap(tx, skb)) 1114 return TX_DROP; 1115 1116 /* 1117 * __ieee80211_parse_tx_radiotap has now removed 1118 * the radiotap header that was present and pre-filled 1119 * 'tx' with tx control information. 1120 */ 1121 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP; 1122 } 1123 1124 /* 1125 * If this flag is set to true anywhere, and we get here, 1126 * we are doing the needed processing, so remove the flag 1127 * now. 1128 */ 1129 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1130 1131 hdr = (struct ieee80211_hdr *) skb->data; 1132 1133 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1134 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1135 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1136 return TX_DROP; 1137 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1138 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1139 } 1140 if (!tx->sta) 1141 tx->sta = sta_info_get(sdata, hdr->addr1); 1142 1143 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1144 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { 1145 unsigned long flags; 1146 struct tid_ampdu_tx *tid_tx; 1147 1148 qc = ieee80211_get_qos_ctl(hdr); 1149 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1150 1151 spin_lock_irqsave(&tx->sta->lock, flags); 1152 /* 1153 * XXX: This spinlock could be fairly expensive, but see the 1154 * comment in agg-tx.c:ieee80211_agg_tx_operational(). 1155 * One way to solve this would be to do something RCU-like 1156 * for managing the tid_tx struct and using atomic bitops 1157 * for the actual state -- by introducing an actual 1158 * 'operational' bit that would be possible. It would 1159 * require changing ieee80211_agg_tx_operational() to 1160 * set that bit, and changing the way tid_tx is managed 1161 * everywhere, including races between that bit and 1162 * tid_tx going away (tid_tx being added can be easily 1163 * committed to memory before the 'operational' bit). 1164 */ 1165 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; 1166 state = &tx->sta->ampdu_mlme.tid_state_tx[tid]; 1167 if (*state == HT_AGG_STATE_OPERATIONAL) { 1168 info->flags |= IEEE80211_TX_CTL_AMPDU; 1169 } else if (*state != HT_AGG_STATE_IDLE) { 1170 /* in progress */ 1171 queued = true; 1172 info->control.vif = &sdata->vif; 1173 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1174 __skb_queue_tail(&tid_tx->pending, skb); 1175 } 1176 spin_unlock_irqrestore(&tx->sta->lock, flags); 1177 1178 if (unlikely(queued)) 1179 return TX_QUEUED; 1180 } 1181 1182 if (is_multicast_ether_addr(hdr->addr1)) { 1183 tx->flags &= ~IEEE80211_TX_UNICAST; 1184 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1185 } else { 1186 tx->flags |= IEEE80211_TX_UNICAST; 1187 if (unlikely(local->wifi_wme_noack_test)) 1188 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1189 else 1190 info->flags &= ~IEEE80211_TX_CTL_NO_ACK; 1191 } 1192 1193 if (tx->flags & IEEE80211_TX_FRAGMENTED) { 1194 if ((tx->flags & IEEE80211_TX_UNICAST) && 1195 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && 1196 !(info->flags & IEEE80211_TX_CTL_AMPDU)) 1197 tx->flags |= IEEE80211_TX_FRAGMENTED; 1198 else 1199 tx->flags &= ~IEEE80211_TX_FRAGMENTED; 1200 } 1201 1202 if (!tx->sta) 1203 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1204 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1205 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1206 1207 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1208 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { 1209 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; 1210 tx->ethertype = (pos[0] << 8) | pos[1]; 1211 } 1212 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1213 1214 return TX_CONTINUE; 1215 } 1216 1217 static int __ieee80211_tx(struct ieee80211_local *local, 1218 struct sk_buff **skbp, 1219 struct sta_info *sta, 1220 bool txpending) 1221 { 1222 struct sk_buff *skb = *skbp, *next; 1223 struct ieee80211_tx_info *info; 1224 struct ieee80211_sub_if_data *sdata; 1225 unsigned long flags; 1226 int ret, len; 1227 bool fragm = false; 1228 1229 while (skb) { 1230 int q = skb_get_queue_mapping(skb); 1231 1232 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1233 ret = IEEE80211_TX_OK; 1234 if (local->queue_stop_reasons[q] || 1235 (!txpending && !skb_queue_empty(&local->pending[q]))) 1236 ret = IEEE80211_TX_PENDING; 1237 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1238 if (ret != IEEE80211_TX_OK) 1239 return ret; 1240 1241 info = IEEE80211_SKB_CB(skb); 1242 1243 if (fragm) 1244 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 1245 IEEE80211_TX_CTL_FIRST_FRAGMENT); 1246 1247 next = skb->next; 1248 len = skb->len; 1249 1250 if (next) 1251 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 1252 1253 sdata = vif_to_sdata(info->control.vif); 1254 1255 switch (sdata->vif.type) { 1256 case NL80211_IFTYPE_MONITOR: 1257 info->control.vif = NULL; 1258 break; 1259 case NL80211_IFTYPE_AP_VLAN: 1260 info->control.vif = &container_of(sdata->bss, 1261 struct ieee80211_sub_if_data, u.ap)->vif; 1262 break; 1263 default: 1264 /* keep */ 1265 break; 1266 } 1267 1268 ret = drv_tx(local, skb); 1269 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { 1270 dev_kfree_skb(skb); 1271 ret = NETDEV_TX_OK; 1272 } 1273 if (ret != NETDEV_TX_OK) { 1274 info->control.vif = &sdata->vif; 1275 return IEEE80211_TX_AGAIN; 1276 } 1277 1278 *skbp = skb = next; 1279 ieee80211_led_tx(local, 1); 1280 fragm = true; 1281 } 1282 1283 return IEEE80211_TX_OK; 1284 } 1285 1286 /* 1287 * Invoke TX handlers, return 0 on success and non-zero if the 1288 * frame was dropped or queued. 1289 */ 1290 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1291 { 1292 struct sk_buff *skb = tx->skb; 1293 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1294 ieee80211_tx_result res = TX_DROP; 1295 1296 #define CALL_TXH(txh) \ 1297 do { \ 1298 res = txh(tx); \ 1299 if (res != TX_CONTINUE) \ 1300 goto txh_done; \ 1301 } while (0) 1302 1303 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1304 CALL_TXH(ieee80211_tx_h_check_assoc); 1305 CALL_TXH(ieee80211_tx_h_ps_buf); 1306 CALL_TXH(ieee80211_tx_h_select_key); 1307 CALL_TXH(ieee80211_tx_h_sta); 1308 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1309 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1310 1311 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) 1312 goto txh_done; 1313 1314 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1315 CALL_TXH(ieee80211_tx_h_sequence); 1316 CALL_TXH(ieee80211_tx_h_fragment); 1317 /* handlers after fragment must be aware of tx info fragmentation! */ 1318 CALL_TXH(ieee80211_tx_h_stats); 1319 CALL_TXH(ieee80211_tx_h_encrypt); 1320 CALL_TXH(ieee80211_tx_h_calculate_duration); 1321 #undef CALL_TXH 1322 1323 txh_done: 1324 if (unlikely(res == TX_DROP)) { 1325 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1326 while (skb) { 1327 struct sk_buff *next; 1328 1329 next = skb->next; 1330 dev_kfree_skb(skb); 1331 skb = next; 1332 } 1333 return -1; 1334 } else if (unlikely(res == TX_QUEUED)) { 1335 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1336 return -1; 1337 } 1338 1339 return 0; 1340 } 1341 1342 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1343 struct sk_buff *skb, bool txpending) 1344 { 1345 struct ieee80211_local *local = sdata->local; 1346 struct ieee80211_tx_data tx; 1347 ieee80211_tx_result res_prepare; 1348 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1349 struct sk_buff *next; 1350 unsigned long flags; 1351 int ret, retries; 1352 u16 queue; 1353 1354 queue = skb_get_queue_mapping(skb); 1355 1356 if (unlikely(skb->len < 10)) { 1357 dev_kfree_skb(skb); 1358 return; 1359 } 1360 1361 rcu_read_lock(); 1362 1363 /* initialises tx */ 1364 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1365 1366 if (unlikely(res_prepare == TX_DROP)) { 1367 dev_kfree_skb(skb); 1368 rcu_read_unlock(); 1369 return; 1370 } else if (unlikely(res_prepare == TX_QUEUED)) { 1371 rcu_read_unlock(); 1372 return; 1373 } 1374 1375 tx.channel = local->hw.conf.channel; 1376 info->band = tx.channel->band; 1377 1378 if (invoke_tx_handlers(&tx)) 1379 goto out; 1380 1381 retries = 0; 1382 retry: 1383 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); 1384 switch (ret) { 1385 case IEEE80211_TX_OK: 1386 break; 1387 case IEEE80211_TX_AGAIN: 1388 /* 1389 * Since there are no fragmented frames on A-MPDU 1390 * queues, there's no reason for a driver to reject 1391 * a frame there, warn and drop it. 1392 */ 1393 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 1394 goto drop; 1395 /* fall through */ 1396 case IEEE80211_TX_PENDING: 1397 skb = tx.skb; 1398 1399 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1400 1401 if (local->queue_stop_reasons[queue] || 1402 !skb_queue_empty(&local->pending[queue])) { 1403 /* 1404 * if queue is stopped, queue up frames for later 1405 * transmission from the tasklet 1406 */ 1407 do { 1408 next = skb->next; 1409 skb->next = NULL; 1410 if (unlikely(txpending)) 1411 __skb_queue_head(&local->pending[queue], 1412 skb); 1413 else 1414 __skb_queue_tail(&local->pending[queue], 1415 skb); 1416 } while ((skb = next)); 1417 1418 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1419 flags); 1420 } else { 1421 /* 1422 * otherwise retry, but this is a race condition or 1423 * a driver bug (which we warn about if it persists) 1424 */ 1425 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1426 flags); 1427 1428 retries++; 1429 if (WARN(retries > 10, "tx refused but queue active\n")) 1430 goto drop; 1431 goto retry; 1432 } 1433 } 1434 out: 1435 rcu_read_unlock(); 1436 return; 1437 1438 drop: 1439 rcu_read_unlock(); 1440 1441 skb = tx.skb; 1442 while (skb) { 1443 next = skb->next; 1444 dev_kfree_skb(skb); 1445 skb = next; 1446 } 1447 } 1448 1449 /* device xmit handlers */ 1450 1451 static int ieee80211_skb_resize(struct ieee80211_local *local, 1452 struct sk_buff *skb, 1453 int head_need, bool may_encrypt) 1454 { 1455 int tail_need = 0; 1456 1457 /* 1458 * This could be optimised, devices that do full hardware 1459 * crypto (including TKIP MMIC) need no tailroom... But we 1460 * have no drivers for such devices currently. 1461 */ 1462 if (may_encrypt) { 1463 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1464 tail_need -= skb_tailroom(skb); 1465 tail_need = max_t(int, tail_need, 0); 1466 } 1467 1468 if (head_need || tail_need) { 1469 /* Sorry. Can't account for this any more */ 1470 skb_orphan(skb); 1471 } 1472 1473 if (skb_header_cloned(skb)) 1474 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1475 else 1476 I802_DEBUG_INC(local->tx_expand_skb_head); 1477 1478 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1479 printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n", 1480 wiphy_name(local->hw.wiphy)); 1481 return -ENOMEM; 1482 } 1483 1484 /* update truesize too */ 1485 skb->truesize += head_need + tail_need; 1486 1487 return 0; 1488 } 1489 1490 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1491 struct sk_buff *skb) 1492 { 1493 struct ieee80211_local *local = sdata->local; 1494 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1496 struct ieee80211_sub_if_data *tmp_sdata; 1497 int headroom; 1498 bool may_encrypt; 1499 1500 rcu_read_lock(); 1501 1502 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { 1503 int hdrlen; 1504 u16 len_rthdr; 1505 1506 info->flags |= IEEE80211_TX_CTL_INJECTED | 1507 IEEE80211_TX_INTFL_HAS_RADIOTAP; 1508 1509 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1510 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1511 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1512 1513 /* check the header is complete in the frame */ 1514 if (likely(skb->len >= len_rthdr + hdrlen)) { 1515 /* 1516 * We process outgoing injected frames that have a 1517 * local address we handle as though they are our 1518 * own frames. 1519 * This code here isn't entirely correct, the local 1520 * MAC address is not necessarily enough to find 1521 * the interface to use; for that proper VLAN/WDS 1522 * support we will need a different mechanism. 1523 */ 1524 1525 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, 1526 list) { 1527 if (!ieee80211_sdata_running(tmp_sdata)) 1528 continue; 1529 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP) 1530 continue; 1531 if (compare_ether_addr(tmp_sdata->vif.addr, 1532 hdr->addr2) == 0) { 1533 sdata = tmp_sdata; 1534 break; 1535 } 1536 } 1537 } 1538 } 1539 1540 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1541 1542 headroom = local->tx_headroom; 1543 if (may_encrypt) 1544 headroom += IEEE80211_ENCRYPT_HEADROOM; 1545 headroom -= skb_headroom(skb); 1546 headroom = max_t(int, 0, headroom); 1547 1548 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { 1549 dev_kfree_skb(skb); 1550 rcu_read_unlock(); 1551 return; 1552 } 1553 1554 info->control.vif = &sdata->vif; 1555 1556 if (ieee80211_vif_is_mesh(&sdata->vif) && 1557 ieee80211_is_data(hdr->frame_control) && 1558 !is_multicast_ether_addr(hdr->addr1)) 1559 if (mesh_nexthop_lookup(skb, sdata)) { 1560 /* skb queued: don't free */ 1561 rcu_read_unlock(); 1562 return; 1563 } 1564 1565 ieee80211_set_qos_hdr(local, skb); 1566 ieee80211_tx(sdata, skb, false); 1567 rcu_read_unlock(); 1568 } 1569 1570 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1571 struct net_device *dev) 1572 { 1573 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1574 struct ieee80211_channel *chan = local->hw.conf.channel; 1575 struct ieee80211_radiotap_header *prthdr = 1576 (struct ieee80211_radiotap_header *)skb->data; 1577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1578 u16 len_rthdr; 1579 1580 /* 1581 * Frame injection is not allowed if beaconing is not allowed 1582 * or if we need radar detection. Beaconing is usually not allowed when 1583 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1584 * Passive scan is also used in world regulatory domains where 1585 * your country is not known and as such it should be treated as 1586 * NO TX unless the channel is explicitly allowed in which case 1587 * your current regulatory domain would not have the passive scan 1588 * flag. 1589 * 1590 * Since AP mode uses monitor interfaces to inject/TX management 1591 * frames we can make AP mode the exception to this rule once it 1592 * supports radar detection as its implementation can deal with 1593 * radar detection by itself. We can do that later by adding a 1594 * monitor flag interfaces used for AP support. 1595 */ 1596 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1597 IEEE80211_CHAN_PASSIVE_SCAN))) 1598 goto fail; 1599 1600 /* check for not even having the fixed radiotap header part */ 1601 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1602 goto fail; /* too short to be possibly valid */ 1603 1604 /* is it a header version we can trust to find length from? */ 1605 if (unlikely(prthdr->it_version)) 1606 goto fail; /* only version 0 is supported */ 1607 1608 /* then there must be a radiotap header with a length we can use */ 1609 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1610 1611 /* does the skb contain enough to deliver on the alleged length? */ 1612 if (unlikely(skb->len < len_rthdr)) 1613 goto fail; /* skb too short for claimed rt header extent */ 1614 1615 /* 1616 * fix up the pointers accounting for the radiotap 1617 * header still being in there. We are being given 1618 * a precooked IEEE80211 header so no need for 1619 * normal processing 1620 */ 1621 skb_set_mac_header(skb, len_rthdr); 1622 /* 1623 * these are just fixed to the end of the rt area since we 1624 * don't have any better information and at this point, nobody cares 1625 */ 1626 skb_set_network_header(skb, len_rthdr); 1627 skb_set_transport_header(skb, len_rthdr); 1628 1629 memset(info, 0, sizeof(*info)); 1630 1631 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1632 1633 /* pass the radiotap header up to xmit */ 1634 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1635 return NETDEV_TX_OK; 1636 1637 fail: 1638 dev_kfree_skb(skb); 1639 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1640 } 1641 1642 /** 1643 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1644 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1645 * @skb: packet to be sent 1646 * @dev: incoming interface 1647 * 1648 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1649 * not be freed, and caller is responsible for either retrying later or freeing 1650 * skb). 1651 * 1652 * This function takes in an Ethernet header and encapsulates it with suitable 1653 * IEEE 802.11 header based on which interface the packet is coming in. The 1654 * encapsulated packet will then be passed to master interface, wlan#.11, for 1655 * transmission (through low-level driver). 1656 */ 1657 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1658 struct net_device *dev) 1659 { 1660 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1661 struct ieee80211_local *local = sdata->local; 1662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1663 int ret = NETDEV_TX_BUSY, head_need; 1664 u16 ethertype, hdrlen, meshhdrlen = 0; 1665 __le16 fc; 1666 struct ieee80211_hdr hdr; 1667 struct ieee80211s_hdr mesh_hdr; 1668 const u8 *encaps_data; 1669 int encaps_len, skip_header_bytes; 1670 int nh_pos, h_pos; 1671 struct sta_info *sta = NULL; 1672 u32 sta_flags = 0; 1673 1674 if (unlikely(skb->len < ETH_HLEN)) { 1675 ret = NETDEV_TX_OK; 1676 goto fail; 1677 } 1678 1679 nh_pos = skb_network_header(skb) - skb->data; 1680 h_pos = skb_transport_header(skb) - skb->data; 1681 1682 /* convert Ethernet header to proper 802.11 header (based on 1683 * operation mode) */ 1684 ethertype = (skb->data[12] << 8) | skb->data[13]; 1685 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1686 1687 switch (sdata->vif.type) { 1688 case NL80211_IFTYPE_AP_VLAN: 1689 rcu_read_lock(); 1690 sta = rcu_dereference(sdata->u.vlan.sta); 1691 if (sta) { 1692 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1693 /* RA TA DA SA */ 1694 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1695 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1696 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1697 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1698 hdrlen = 30; 1699 sta_flags = get_sta_flags(sta); 1700 } 1701 rcu_read_unlock(); 1702 if (sta) 1703 break; 1704 /* fall through */ 1705 case NL80211_IFTYPE_AP: 1706 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1707 /* DA BSSID SA */ 1708 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1709 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1710 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1711 hdrlen = 24; 1712 break; 1713 case NL80211_IFTYPE_WDS: 1714 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1715 /* RA TA DA SA */ 1716 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1717 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1718 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1719 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1720 hdrlen = 30; 1721 break; 1722 #ifdef CONFIG_MAC80211_MESH 1723 case NL80211_IFTYPE_MESH_POINT: 1724 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1725 /* Do not send frames with mesh_ttl == 0 */ 1726 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1727 ret = NETDEV_TX_OK; 1728 goto fail; 1729 } 1730 1731 if (compare_ether_addr(sdata->vif.addr, 1732 skb->data + ETH_ALEN) == 0) { 1733 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1734 skb->data, skb->data + ETH_ALEN); 1735 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1736 sdata, NULL, NULL, NULL); 1737 } else { 1738 /* packet from other interface */ 1739 struct mesh_path *mppath; 1740 int is_mesh_mcast = 1; 1741 const u8 *mesh_da; 1742 1743 rcu_read_lock(); 1744 if (is_multicast_ether_addr(skb->data)) 1745 /* DA TA mSA AE:SA */ 1746 mesh_da = skb->data; 1747 else { 1748 static const u8 bcast[ETH_ALEN] = 1749 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1750 1751 mppath = mpp_path_lookup(skb->data, sdata); 1752 if (mppath) { 1753 /* RA TA mDA mSA AE:DA SA */ 1754 mesh_da = mppath->mpp; 1755 is_mesh_mcast = 0; 1756 } else { 1757 /* DA TA mSA AE:SA */ 1758 mesh_da = bcast; 1759 } 1760 } 1761 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1762 mesh_da, sdata->vif.addr); 1763 rcu_read_unlock(); 1764 if (is_mesh_mcast) 1765 meshhdrlen = 1766 ieee80211_new_mesh_header(&mesh_hdr, 1767 sdata, 1768 skb->data + ETH_ALEN, 1769 NULL, 1770 NULL); 1771 else 1772 meshhdrlen = 1773 ieee80211_new_mesh_header(&mesh_hdr, 1774 sdata, 1775 NULL, 1776 skb->data, 1777 skb->data + ETH_ALEN); 1778 1779 } 1780 break; 1781 #endif 1782 case NL80211_IFTYPE_STATION: 1783 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1784 if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) { 1785 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1786 /* RA TA DA SA */ 1787 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1788 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1789 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1790 hdrlen = 30; 1791 } else { 1792 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1793 /* BSSID SA DA */ 1794 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1795 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1796 hdrlen = 24; 1797 } 1798 break; 1799 case NL80211_IFTYPE_ADHOC: 1800 /* DA SA BSSID */ 1801 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1802 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1803 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1804 hdrlen = 24; 1805 break; 1806 default: 1807 ret = NETDEV_TX_OK; 1808 goto fail; 1809 } 1810 1811 /* 1812 * There's no need to try to look up the destination 1813 * if it is a multicast address (which can only happen 1814 * in AP mode) 1815 */ 1816 if (!is_multicast_ether_addr(hdr.addr1)) { 1817 rcu_read_lock(); 1818 sta = sta_info_get(sdata, hdr.addr1); 1819 if (sta) 1820 sta_flags = get_sta_flags(sta); 1821 rcu_read_unlock(); 1822 } 1823 1824 /* receiver and we are QoS enabled, use a QoS type frame */ 1825 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { 1826 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1827 hdrlen += 2; 1828 } 1829 1830 /* 1831 * Drop unicast frames to unauthorised stations unless they are 1832 * EAPOL frames from the local station. 1833 */ 1834 if (!ieee80211_vif_is_mesh(&sdata->vif) && 1835 unlikely(!is_multicast_ether_addr(hdr.addr1) && 1836 !(sta_flags & WLAN_STA_AUTHORIZED) && 1837 !(ethertype == ETH_P_PAE && 1838 compare_ether_addr(sdata->vif.addr, 1839 skb->data + ETH_ALEN) == 0))) { 1840 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1841 if (net_ratelimit()) 1842 printk(KERN_DEBUG "%s: dropped frame to %pM" 1843 " (unauthorized port)\n", dev->name, 1844 hdr.addr1); 1845 #endif 1846 1847 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1848 1849 ret = NETDEV_TX_OK; 1850 goto fail; 1851 } 1852 1853 hdr.frame_control = fc; 1854 hdr.duration_id = 0; 1855 hdr.seq_ctrl = 0; 1856 1857 skip_header_bytes = ETH_HLEN; 1858 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 1859 encaps_data = bridge_tunnel_header; 1860 encaps_len = sizeof(bridge_tunnel_header); 1861 skip_header_bytes -= 2; 1862 } else if (ethertype >= 0x600) { 1863 encaps_data = rfc1042_header; 1864 encaps_len = sizeof(rfc1042_header); 1865 skip_header_bytes -= 2; 1866 } else { 1867 encaps_data = NULL; 1868 encaps_len = 0; 1869 } 1870 1871 skb_pull(skb, skip_header_bytes); 1872 nh_pos -= skip_header_bytes; 1873 h_pos -= skip_header_bytes; 1874 1875 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 1876 1877 /* 1878 * So we need to modify the skb header and hence need a copy of 1879 * that. The head_need variable above doesn't, so far, include 1880 * the needed header space that we don't need right away. If we 1881 * can, then we don't reallocate right now but only after the 1882 * frame arrives at the master device (if it does...) 1883 * 1884 * If we cannot, however, then we will reallocate to include all 1885 * the ever needed space. Also, if we need to reallocate it anyway, 1886 * make it big enough for everything we may ever need. 1887 */ 1888 1889 if (head_need > 0 || skb_cloned(skb)) { 1890 head_need += IEEE80211_ENCRYPT_HEADROOM; 1891 head_need += local->tx_headroom; 1892 head_need = max_t(int, 0, head_need); 1893 if (ieee80211_skb_resize(local, skb, head_need, true)) 1894 goto fail; 1895 } 1896 1897 if (encaps_data) { 1898 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 1899 nh_pos += encaps_len; 1900 h_pos += encaps_len; 1901 } 1902 1903 if (meshhdrlen > 0) { 1904 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 1905 nh_pos += meshhdrlen; 1906 h_pos += meshhdrlen; 1907 } 1908 1909 if (ieee80211_is_data_qos(fc)) { 1910 __le16 *qos_control; 1911 1912 qos_control = (__le16*) skb_push(skb, 2); 1913 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 1914 /* 1915 * Maybe we could actually set some fields here, for now just 1916 * initialise to zero to indicate no special operation. 1917 */ 1918 *qos_control = 0; 1919 } else 1920 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 1921 1922 nh_pos += hdrlen; 1923 h_pos += hdrlen; 1924 1925 dev->stats.tx_packets++; 1926 dev->stats.tx_bytes += skb->len; 1927 1928 /* Update skb pointers to various headers since this modified frame 1929 * is going to go through Linux networking code that may potentially 1930 * need things like pointer to IP header. */ 1931 skb_set_mac_header(skb, 0); 1932 skb_set_network_header(skb, nh_pos); 1933 skb_set_transport_header(skb, h_pos); 1934 1935 memset(info, 0, sizeof(*info)); 1936 1937 dev->trans_start = jiffies; 1938 ieee80211_xmit(sdata, skb); 1939 1940 return NETDEV_TX_OK; 1941 1942 fail: 1943 if (ret == NETDEV_TX_OK) 1944 dev_kfree_skb(skb); 1945 1946 return ret; 1947 } 1948 1949 1950 /* 1951 * ieee80211_clear_tx_pending may not be called in a context where 1952 * it is possible that it packets could come in again. 1953 */ 1954 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 1955 { 1956 int i; 1957 1958 for (i = 0; i < local->hw.queues; i++) 1959 skb_queue_purge(&local->pending[i]); 1960 } 1961 1962 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 1963 struct sk_buff *skb) 1964 { 1965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1966 struct ieee80211_sub_if_data *sdata; 1967 struct sta_info *sta; 1968 struct ieee80211_hdr *hdr; 1969 int ret; 1970 bool result = true; 1971 1972 sdata = vif_to_sdata(info->control.vif); 1973 1974 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 1975 ieee80211_tx(sdata, skb, true); 1976 } else { 1977 hdr = (struct ieee80211_hdr *)skb->data; 1978 sta = sta_info_get(sdata, hdr->addr1); 1979 1980 ret = __ieee80211_tx(local, &skb, sta, true); 1981 if (ret != IEEE80211_TX_OK) 1982 result = false; 1983 } 1984 1985 return result; 1986 } 1987 1988 /* 1989 * Transmit all pending packets. Called from tasklet. 1990 */ 1991 void ieee80211_tx_pending(unsigned long data) 1992 { 1993 struct ieee80211_local *local = (struct ieee80211_local *)data; 1994 unsigned long flags; 1995 int i; 1996 bool txok; 1997 1998 rcu_read_lock(); 1999 2000 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2001 for (i = 0; i < local->hw.queues; i++) { 2002 /* 2003 * If queue is stopped by something other than due to pending 2004 * frames, or we have no pending frames, proceed to next queue. 2005 */ 2006 if (local->queue_stop_reasons[i] || 2007 skb_queue_empty(&local->pending[i])) 2008 continue; 2009 2010 while (!skb_queue_empty(&local->pending[i])) { 2011 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2013 struct ieee80211_sub_if_data *sdata; 2014 2015 if (WARN_ON(!info->control.vif)) { 2016 kfree_skb(skb); 2017 continue; 2018 } 2019 2020 sdata = vif_to_sdata(info->control.vif); 2021 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2022 flags); 2023 2024 txok = ieee80211_tx_pending_skb(local, skb); 2025 if (!txok) 2026 __skb_queue_head(&local->pending[i], skb); 2027 spin_lock_irqsave(&local->queue_stop_reason_lock, 2028 flags); 2029 if (!txok) 2030 break; 2031 } 2032 } 2033 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2034 2035 rcu_read_unlock(); 2036 } 2037 2038 /* functions for drivers to get certain frames */ 2039 2040 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, 2041 struct sk_buff *skb, 2042 struct beacon_data *beacon) 2043 { 2044 u8 *pos, *tim; 2045 int aid0 = 0; 2046 int i, have_bits = 0, n1, n2; 2047 2048 /* Generate bitmap for TIM only if there are any STAs in power save 2049 * mode. */ 2050 if (atomic_read(&bss->num_sta_ps) > 0) 2051 /* in the hope that this is faster than 2052 * checking byte-for-byte */ 2053 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2054 IEEE80211_MAX_AID+1); 2055 2056 if (bss->dtim_count == 0) 2057 bss->dtim_count = beacon->dtim_period - 1; 2058 else 2059 bss->dtim_count--; 2060 2061 tim = pos = (u8 *) skb_put(skb, 6); 2062 *pos++ = WLAN_EID_TIM; 2063 *pos++ = 4; 2064 *pos++ = bss->dtim_count; 2065 *pos++ = beacon->dtim_period; 2066 2067 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2068 aid0 = 1; 2069 2070 if (have_bits) { 2071 /* Find largest even number N1 so that bits numbered 1 through 2072 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2073 * (N2 + 1) x 8 through 2007 are 0. */ 2074 n1 = 0; 2075 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2076 if (bss->tim[i]) { 2077 n1 = i & 0xfe; 2078 break; 2079 } 2080 } 2081 n2 = n1; 2082 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2083 if (bss->tim[i]) { 2084 n2 = i; 2085 break; 2086 } 2087 } 2088 2089 /* Bitmap control */ 2090 *pos++ = n1 | aid0; 2091 /* Part Virt Bitmap */ 2092 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2093 2094 tim[1] = n2 - n1 + 4; 2095 skb_put(skb, n2 - n1); 2096 } else { 2097 *pos++ = aid0; /* Bitmap control */ 2098 *pos++ = 0; /* Part Virt Bitmap */ 2099 } 2100 } 2101 2102 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2103 struct ieee80211_vif *vif, 2104 u16 *tim_offset, u16 *tim_length) 2105 { 2106 struct ieee80211_local *local = hw_to_local(hw); 2107 struct sk_buff *skb = NULL; 2108 struct ieee80211_tx_info *info; 2109 struct ieee80211_sub_if_data *sdata = NULL; 2110 struct ieee80211_if_ap *ap = NULL; 2111 struct beacon_data *beacon; 2112 struct ieee80211_supported_band *sband; 2113 enum ieee80211_band band = local->hw.conf.channel->band; 2114 struct ieee80211_tx_rate_control txrc; 2115 2116 sband = local->hw.wiphy->bands[band]; 2117 2118 rcu_read_lock(); 2119 2120 sdata = vif_to_sdata(vif); 2121 2122 if (tim_offset) 2123 *tim_offset = 0; 2124 if (tim_length) 2125 *tim_length = 0; 2126 2127 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2128 ap = &sdata->u.ap; 2129 beacon = rcu_dereference(ap->beacon); 2130 if (ap && beacon) { 2131 /* 2132 * headroom, head length, 2133 * tail length and maximum TIM length 2134 */ 2135 skb = dev_alloc_skb(local->tx_headroom + 2136 beacon->head_len + 2137 beacon->tail_len + 256); 2138 if (!skb) 2139 goto out; 2140 2141 skb_reserve(skb, local->tx_headroom); 2142 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2143 beacon->head_len); 2144 2145 /* 2146 * Not very nice, but we want to allow the driver to call 2147 * ieee80211_beacon_get() as a response to the set_tim() 2148 * callback. That, however, is already invoked under the 2149 * sta_lock to guarantee consistent and race-free update 2150 * of the tim bitmap in mac80211 and the driver. 2151 */ 2152 if (local->tim_in_locked_section) { 2153 ieee80211_beacon_add_tim(ap, skb, beacon); 2154 } else { 2155 unsigned long flags; 2156 2157 spin_lock_irqsave(&local->sta_lock, flags); 2158 ieee80211_beacon_add_tim(ap, skb, beacon); 2159 spin_unlock_irqrestore(&local->sta_lock, flags); 2160 } 2161 2162 if (tim_offset) 2163 *tim_offset = beacon->head_len; 2164 if (tim_length) 2165 *tim_length = skb->len - beacon->head_len; 2166 2167 if (beacon->tail) 2168 memcpy(skb_put(skb, beacon->tail_len), 2169 beacon->tail, beacon->tail_len); 2170 } else 2171 goto out; 2172 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2173 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2174 struct ieee80211_hdr *hdr; 2175 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2176 2177 if (!presp) 2178 goto out; 2179 2180 skb = skb_copy(presp, GFP_ATOMIC); 2181 if (!skb) 2182 goto out; 2183 2184 hdr = (struct ieee80211_hdr *) skb->data; 2185 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2186 IEEE80211_STYPE_BEACON); 2187 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2188 struct ieee80211_mgmt *mgmt; 2189 u8 *pos; 2190 2191 /* headroom, head length, tail length and maximum TIM length */ 2192 skb = dev_alloc_skb(local->tx_headroom + 400); 2193 if (!skb) 2194 goto out; 2195 2196 skb_reserve(skb, local->hw.extra_tx_headroom); 2197 mgmt = (struct ieee80211_mgmt *) 2198 skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 2199 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 2200 mgmt->frame_control = 2201 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2202 memset(mgmt->da, 0xff, ETH_ALEN); 2203 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2204 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2205 mgmt->u.beacon.beacon_int = 2206 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2207 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ 2208 2209 pos = skb_put(skb, 2); 2210 *pos++ = WLAN_EID_SSID; 2211 *pos++ = 0x0; 2212 2213 mesh_mgmt_ies_add(skb, sdata); 2214 } else { 2215 WARN_ON(1); 2216 goto out; 2217 } 2218 2219 info = IEEE80211_SKB_CB(skb); 2220 2221 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2222 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2223 info->band = band; 2224 2225 memset(&txrc, 0, sizeof(txrc)); 2226 txrc.hw = hw; 2227 txrc.sband = sband; 2228 txrc.bss_conf = &sdata->vif.bss_conf; 2229 txrc.skb = skb; 2230 txrc.reported_rate.idx = -1; 2231 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2232 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2233 txrc.max_rate_idx = -1; 2234 else 2235 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2236 txrc.ap = true; 2237 rate_control_get_rate(sdata, NULL, &txrc); 2238 2239 info->control.vif = vif; 2240 2241 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 2242 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 2243 out: 2244 rcu_read_unlock(); 2245 return skb; 2246 } 2247 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2248 2249 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2250 struct ieee80211_vif *vif) 2251 { 2252 struct ieee80211_sub_if_data *sdata; 2253 struct ieee80211_if_managed *ifmgd; 2254 struct ieee80211_pspoll *pspoll; 2255 struct ieee80211_local *local; 2256 struct sk_buff *skb; 2257 2258 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2259 return NULL; 2260 2261 sdata = vif_to_sdata(vif); 2262 ifmgd = &sdata->u.mgd; 2263 local = sdata->local; 2264 2265 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2266 if (!skb) { 2267 printk(KERN_DEBUG "%s: failed to allocate buffer for " 2268 "pspoll template\n", sdata->name); 2269 return NULL; 2270 } 2271 skb_reserve(skb, local->hw.extra_tx_headroom); 2272 2273 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2274 memset(pspoll, 0, sizeof(*pspoll)); 2275 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2276 IEEE80211_STYPE_PSPOLL); 2277 pspoll->aid = cpu_to_le16(ifmgd->aid); 2278 2279 /* aid in PS-Poll has its two MSBs each set to 1 */ 2280 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2281 2282 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2283 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2284 2285 return skb; 2286 } 2287 EXPORT_SYMBOL(ieee80211_pspoll_get); 2288 2289 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2290 struct ieee80211_vif *vif) 2291 { 2292 struct ieee80211_hdr_3addr *nullfunc; 2293 struct ieee80211_sub_if_data *sdata; 2294 struct ieee80211_if_managed *ifmgd; 2295 struct ieee80211_local *local; 2296 struct sk_buff *skb; 2297 2298 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2299 return NULL; 2300 2301 sdata = vif_to_sdata(vif); 2302 ifmgd = &sdata->u.mgd; 2303 local = sdata->local; 2304 2305 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2306 if (!skb) { 2307 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " 2308 "template\n", sdata->name); 2309 return NULL; 2310 } 2311 skb_reserve(skb, local->hw.extra_tx_headroom); 2312 2313 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2314 sizeof(*nullfunc)); 2315 memset(nullfunc, 0, sizeof(*nullfunc)); 2316 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2317 IEEE80211_STYPE_NULLFUNC | 2318 IEEE80211_FCTL_TODS); 2319 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2320 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2321 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2322 2323 return skb; 2324 } 2325 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2326 2327 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2328 struct ieee80211_vif *vif, 2329 const u8 *ssid, size_t ssid_len, 2330 const u8 *ie, size_t ie_len) 2331 { 2332 struct ieee80211_sub_if_data *sdata; 2333 struct ieee80211_local *local; 2334 struct ieee80211_hdr_3addr *hdr; 2335 struct sk_buff *skb; 2336 size_t ie_ssid_len; 2337 u8 *pos; 2338 2339 sdata = vif_to_sdata(vif); 2340 local = sdata->local; 2341 ie_ssid_len = 2 + ssid_len; 2342 2343 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2344 ie_ssid_len + ie_len); 2345 if (!skb) { 2346 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 2347 "request template\n", sdata->name); 2348 return NULL; 2349 } 2350 2351 skb_reserve(skb, local->hw.extra_tx_headroom); 2352 2353 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2354 memset(hdr, 0, sizeof(*hdr)); 2355 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2356 IEEE80211_STYPE_PROBE_REQ); 2357 memset(hdr->addr1, 0xff, ETH_ALEN); 2358 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2359 memset(hdr->addr3, 0xff, ETH_ALEN); 2360 2361 pos = skb_put(skb, ie_ssid_len); 2362 *pos++ = WLAN_EID_SSID; 2363 *pos++ = ssid_len; 2364 if (ssid) 2365 memcpy(pos, ssid, ssid_len); 2366 pos += ssid_len; 2367 2368 if (ie) { 2369 pos = skb_put(skb, ie_len); 2370 memcpy(pos, ie, ie_len); 2371 } 2372 2373 return skb; 2374 } 2375 EXPORT_SYMBOL(ieee80211_probereq_get); 2376 2377 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2378 const void *frame, size_t frame_len, 2379 const struct ieee80211_tx_info *frame_txctl, 2380 struct ieee80211_rts *rts) 2381 { 2382 const struct ieee80211_hdr *hdr = frame; 2383 2384 rts->frame_control = 2385 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2386 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2387 frame_txctl); 2388 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2389 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2390 } 2391 EXPORT_SYMBOL(ieee80211_rts_get); 2392 2393 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2394 const void *frame, size_t frame_len, 2395 const struct ieee80211_tx_info *frame_txctl, 2396 struct ieee80211_cts *cts) 2397 { 2398 const struct ieee80211_hdr *hdr = frame; 2399 2400 cts->frame_control = 2401 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2402 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2403 frame_len, frame_txctl); 2404 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2405 } 2406 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2407 2408 struct sk_buff * 2409 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2410 struct ieee80211_vif *vif) 2411 { 2412 struct ieee80211_local *local = hw_to_local(hw); 2413 struct sk_buff *skb = NULL; 2414 struct sta_info *sta; 2415 struct ieee80211_tx_data tx; 2416 struct ieee80211_sub_if_data *sdata; 2417 struct ieee80211_if_ap *bss = NULL; 2418 struct beacon_data *beacon; 2419 struct ieee80211_tx_info *info; 2420 2421 sdata = vif_to_sdata(vif); 2422 bss = &sdata->u.ap; 2423 2424 rcu_read_lock(); 2425 beacon = rcu_dereference(bss->beacon); 2426 2427 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2428 goto out; 2429 2430 if (bss->dtim_count != 0) 2431 goto out; /* send buffered bc/mc only after DTIM beacon */ 2432 2433 while (1) { 2434 skb = skb_dequeue(&bss->ps_bc_buf); 2435 if (!skb) 2436 goto out; 2437 local->total_ps_buffered--; 2438 2439 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2440 struct ieee80211_hdr *hdr = 2441 (struct ieee80211_hdr *) skb->data; 2442 /* more buffered multicast/broadcast frames ==> set 2443 * MoreData flag in IEEE 802.11 header to inform PS 2444 * STAs */ 2445 hdr->frame_control |= 2446 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2447 } 2448 2449 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2450 break; 2451 dev_kfree_skb_any(skb); 2452 } 2453 2454 info = IEEE80211_SKB_CB(skb); 2455 2456 sta = tx.sta; 2457 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2458 tx.channel = local->hw.conf.channel; 2459 info->band = tx.channel->band; 2460 2461 if (invoke_tx_handlers(&tx)) 2462 skb = NULL; 2463 out: 2464 rcu_read_unlock(); 2465 2466 return skb; 2467 } 2468 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2469 2470 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 2471 { 2472 skb_set_mac_header(skb, 0); 2473 skb_set_network_header(skb, 0); 2474 skb_set_transport_header(skb, 0); 2475 2476 /* send all internal mgmt frames on VO */ 2477 skb_set_queue_mapping(skb, 0); 2478 2479 /* 2480 * The other path calling ieee80211_xmit is from the tasklet, 2481 * and while we can handle concurrent transmissions locking 2482 * requirements are that we do not come into tx with bhs on. 2483 */ 2484 local_bh_disable(); 2485 ieee80211_xmit(sdata, skb); 2486 local_bh_enable(); 2487 } 2488