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_WDS) 277 return TX_CONTINUE; 278 279 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 280 return TX_CONTINUE; 281 282 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 283 return TX_CONTINUE; 284 285 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; 286 287 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 288 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && 289 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 290 ieee80211_is_data(hdr->frame_control))) { 291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 292 printk(KERN_DEBUG "%s: dropped data frame to not " 293 "associated station %pM\n", 294 tx->sdata->name, hdr->addr1); 295 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 296 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 297 return TX_DROP; 298 } 299 } else { 300 if (unlikely(ieee80211_is_data(hdr->frame_control) && 301 tx->local->num_sta == 0 && 302 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { 303 /* 304 * No associated STAs - no need to send multicast 305 * frames. 306 */ 307 return TX_DROP; 308 } 309 return TX_CONTINUE; 310 } 311 312 return TX_CONTINUE; 313 } 314 315 /* This function is called whenever the AP is about to exceed the maximum limit 316 * of buffered frames for power saving STAs. This situation should not really 317 * happen often during normal operation, so dropping the oldest buffered packet 318 * from each queue should be OK to make some room for new frames. */ 319 static void purge_old_ps_buffers(struct ieee80211_local *local) 320 { 321 int total = 0, purged = 0; 322 struct sk_buff *skb; 323 struct ieee80211_sub_if_data *sdata; 324 struct sta_info *sta; 325 326 /* 327 * virtual interfaces are protected by RCU 328 */ 329 rcu_read_lock(); 330 331 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 332 struct ieee80211_if_ap *ap; 333 if (sdata->vif.type != NL80211_IFTYPE_AP) 334 continue; 335 ap = &sdata->u.ap; 336 skb = skb_dequeue(&ap->ps_bc_buf); 337 if (skb) { 338 purged++; 339 dev_kfree_skb(skb); 340 } 341 total += skb_queue_len(&ap->ps_bc_buf); 342 } 343 344 list_for_each_entry_rcu(sta, &local->sta_list, list) { 345 skb = skb_dequeue(&sta->ps_tx_buf); 346 if (skb) { 347 purged++; 348 dev_kfree_skb(skb); 349 } 350 total += skb_queue_len(&sta->ps_tx_buf); 351 } 352 353 rcu_read_unlock(); 354 355 local->total_ps_buffered = total; 356 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 357 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n", 358 purged); 359 #endif 360 } 361 362 static ieee80211_tx_result 363 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 364 { 365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 367 368 /* 369 * broadcast/multicast frame 370 * 371 * If any of the associated stations is in power save mode, 372 * the frame is buffered to be sent after DTIM beacon frame. 373 * This is done either by the hardware or us. 374 */ 375 376 /* powersaving STAs only in AP/VLAN mode */ 377 if (!tx->sdata->bss) 378 return TX_CONTINUE; 379 380 /* no buffering for ordered frames */ 381 if (ieee80211_has_order(hdr->frame_control)) 382 return TX_CONTINUE; 383 384 /* no stations in PS mode */ 385 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 386 return TX_CONTINUE; 387 388 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 389 390 /* device releases frame after DTIM beacon */ 391 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 392 return TX_CONTINUE; 393 394 /* buffered in mac80211 */ 395 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 396 purge_old_ps_buffers(tx->local); 397 398 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 400 if (net_ratelimit()) 401 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", 402 tx->sdata->name); 403 #endif 404 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 405 } else 406 tx->local->total_ps_buffered++; 407 408 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 409 410 return TX_QUEUED; 411 } 412 413 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 414 struct sk_buff *skb) 415 { 416 if (!ieee80211_is_mgmt(fc)) 417 return 0; 418 419 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP)) 420 return 0; 421 422 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 423 skb->data)) 424 return 0; 425 426 return 1; 427 } 428 429 static ieee80211_tx_result 430 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 431 { 432 struct sta_info *sta = tx->sta; 433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 435 struct ieee80211_local *local = tx->local; 436 u32 staflags; 437 438 if (unlikely(!sta || 439 ieee80211_is_probe_resp(hdr->frame_control) || 440 ieee80211_is_auth(hdr->frame_control) || 441 ieee80211_is_assoc_resp(hdr->frame_control) || 442 ieee80211_is_reassoc_resp(hdr->frame_control))) 443 return TX_CONTINUE; 444 445 staflags = get_sta_flags(sta); 446 447 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) && 448 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) { 449 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 450 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries " 451 "before %d)\n", 452 sta->sta.addr, sta->sta.aid, 453 skb_queue_len(&sta->ps_tx_buf)); 454 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 456 purge_old_ps_buffers(tx->local); 457 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { 458 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); 459 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 460 if (net_ratelimit()) { 461 printk(KERN_DEBUG "%s: STA %pM TX " 462 "buffer full - dropping oldest frame\n", 463 tx->sdata->name, sta->sta.addr); 464 } 465 #endif 466 dev_kfree_skb(old); 467 } else 468 tx->local->total_ps_buffered++; 469 470 /* 471 * Queue frame to be sent after STA wakes up/polls, 472 * but don't set the TIM bit if the driver is blocking 473 * wakeup or poll response transmissions anyway. 474 */ 475 if (skb_queue_empty(&sta->ps_tx_buf) && 476 !(staflags & WLAN_STA_PS_DRIVER)) 477 sta_info_set_tim_bit(sta); 478 479 info->control.jiffies = jiffies; 480 info->control.vif = &tx->sdata->vif; 481 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 482 skb_queue_tail(&sta->ps_tx_buf, tx->skb); 483 484 if (!timer_pending(&local->sta_cleanup)) 485 mod_timer(&local->sta_cleanup, 486 round_jiffies(jiffies + 487 STA_INFO_CLEANUP_INTERVAL)); 488 489 return TX_QUEUED; 490 } 491 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 492 else if (unlikely(staflags & WLAN_STA_PS_STA)) { 493 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll " 494 "set -> send frame\n", tx->sdata->name, 495 sta->sta.addr); 496 } 497 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 498 499 return TX_CONTINUE; 500 } 501 502 static ieee80211_tx_result debug_noinline 503 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 504 { 505 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 506 return TX_CONTINUE; 507 508 if (tx->flags & IEEE80211_TX_UNICAST) 509 return ieee80211_tx_h_unicast_ps_buf(tx); 510 else 511 return ieee80211_tx_h_multicast_ps_buf(tx); 512 } 513 514 static ieee80211_tx_result debug_noinline 515 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 516 { 517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 518 519 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 520 tx->sdata->control_port_no_encrypt)) 521 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 522 523 return TX_CONTINUE; 524 } 525 526 static ieee80211_tx_result debug_noinline 527 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 528 { 529 struct ieee80211_key *key = NULL; 530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 531 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 532 533 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 534 tx->key = NULL; 535 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 536 tx->key = key; 537 else if (ieee80211_is_mgmt(hdr->frame_control) && 538 is_multicast_ether_addr(hdr->addr1) && 539 ieee80211_is_robust_mgmt_frame(hdr) && 540 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 541 tx->key = key; 542 else if ((key = rcu_dereference(tx->sdata->default_key))) 543 tx->key = key; 544 else if (tx->sdata->drop_unencrypted && 545 (tx->skb->protocol != tx->sdata->control_port_protocol) && 546 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 547 (!ieee80211_is_robust_mgmt_frame(hdr) || 548 (ieee80211_is_action(hdr->frame_control) && 549 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) { 550 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 551 return TX_DROP; 552 } else 553 tx->key = NULL; 554 555 if (tx->key) { 556 bool skip_hw = false; 557 558 tx->key->tx_rx_count++; 559 /* TODO: add threshold stuff again */ 560 561 switch (tx->key->conf.cipher) { 562 case WLAN_CIPHER_SUITE_WEP40: 563 case WLAN_CIPHER_SUITE_WEP104: 564 if (ieee80211_is_auth(hdr->frame_control)) 565 break; 566 case WLAN_CIPHER_SUITE_TKIP: 567 if (!ieee80211_is_data_present(hdr->frame_control)) 568 tx->key = NULL; 569 break; 570 case WLAN_CIPHER_SUITE_CCMP: 571 if (!ieee80211_is_data_present(hdr->frame_control) && 572 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 573 tx->skb)) 574 tx->key = NULL; 575 else 576 skip_hw = (tx->key->conf.flags & 577 IEEE80211_KEY_FLAG_SW_MGMT) && 578 ieee80211_is_mgmt(hdr->frame_control); 579 break; 580 case WLAN_CIPHER_SUITE_AES_CMAC: 581 if (!ieee80211_is_mgmt(hdr->frame_control)) 582 tx->key = NULL; 583 break; 584 } 585 586 if (!skip_hw && tx->key && 587 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 588 info->control.hw_key = &tx->key->conf; 589 } 590 591 return TX_CONTINUE; 592 } 593 594 static ieee80211_tx_result debug_noinline 595 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 596 { 597 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 598 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 599 struct ieee80211_supported_band *sband; 600 struct ieee80211_rate *rate; 601 int i; 602 u32 len; 603 bool inval = false, rts = false, short_preamble = false; 604 struct ieee80211_tx_rate_control txrc; 605 u32 sta_flags; 606 607 memset(&txrc, 0, sizeof(txrc)); 608 609 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 610 611 len = min_t(u32, tx->skb->len + FCS_LEN, 612 tx->local->hw.wiphy->frag_threshold); 613 614 /* set up the tx rate control struct we give the RC algo */ 615 txrc.hw = local_to_hw(tx->local); 616 txrc.sband = sband; 617 txrc.bss_conf = &tx->sdata->vif.bss_conf; 618 txrc.skb = tx->skb; 619 txrc.reported_rate.idx = -1; 620 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 621 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 622 txrc.max_rate_idx = -1; 623 else 624 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 625 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP; 626 627 /* set up RTS protection if desired */ 628 if (len > tx->local->hw.wiphy->rts_threshold) { 629 txrc.rts = rts = true; 630 } 631 632 /* 633 * Use short preamble if the BSS can handle it, but not for 634 * management frames unless we know the receiver can handle 635 * that -- the management frame might be to a station that 636 * just wants a probe response. 637 */ 638 if (tx->sdata->vif.bss_conf.use_short_preamble && 639 (ieee80211_is_data(hdr->frame_control) || 640 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 641 txrc.short_preamble = short_preamble = true; 642 643 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0; 644 645 /* 646 * Lets not bother rate control if we're associated and cannot 647 * talk to the sta. This should not happen. 648 */ 649 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && 650 (sta_flags & WLAN_STA_ASSOC) && 651 !rate_usable_index_exists(sband, &tx->sta->sta), 652 "%s: Dropped data frame as no usable bitrate found while " 653 "scanning and associated. Target station: " 654 "%pM on %d GHz band\n", 655 tx->sdata->name, hdr->addr1, 656 tx->channel->band ? 5 : 2)) 657 return TX_DROP; 658 659 /* 660 * If we're associated with the sta at this point we know we can at 661 * least send the frame at the lowest bit rate. 662 */ 663 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 664 665 if (unlikely(info->control.rates[0].idx < 0)) 666 return TX_DROP; 667 668 if (txrc.reported_rate.idx < 0) 669 txrc.reported_rate = info->control.rates[0]; 670 671 if (tx->sta) 672 tx->sta->last_tx_rate = txrc.reported_rate; 673 674 if (unlikely(!info->control.rates[0].count)) 675 info->control.rates[0].count = 1; 676 677 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 678 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 679 info->control.rates[0].count = 1; 680 681 if (is_multicast_ether_addr(hdr->addr1)) { 682 /* 683 * XXX: verify the rate is in the basic rateset 684 */ 685 return TX_CONTINUE; 686 } 687 688 /* 689 * set up the RTS/CTS rate as the fastest basic rate 690 * that is not faster than the data rate 691 * 692 * XXX: Should this check all retry rates? 693 */ 694 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 695 s8 baserate = 0; 696 697 rate = &sband->bitrates[info->control.rates[0].idx]; 698 699 for (i = 0; i < sband->n_bitrates; i++) { 700 /* must be a basic rate */ 701 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 702 continue; 703 /* must not be faster than the data rate */ 704 if (sband->bitrates[i].bitrate > rate->bitrate) 705 continue; 706 /* maximum */ 707 if (sband->bitrates[baserate].bitrate < 708 sband->bitrates[i].bitrate) 709 baserate = i; 710 } 711 712 info->control.rts_cts_rate_idx = baserate; 713 } 714 715 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 716 /* 717 * make sure there's no valid rate following 718 * an invalid one, just in case drivers don't 719 * take the API seriously to stop at -1. 720 */ 721 if (inval) { 722 info->control.rates[i].idx = -1; 723 continue; 724 } 725 if (info->control.rates[i].idx < 0) { 726 inval = true; 727 continue; 728 } 729 730 /* 731 * For now assume MCS is already set up correctly, this 732 * needs to be fixed. 733 */ 734 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 735 WARN_ON(info->control.rates[i].idx > 76); 736 continue; 737 } 738 739 /* set up RTS protection if desired */ 740 if (rts) 741 info->control.rates[i].flags |= 742 IEEE80211_TX_RC_USE_RTS_CTS; 743 744 /* RC is busted */ 745 if (WARN_ON_ONCE(info->control.rates[i].idx >= 746 sband->n_bitrates)) { 747 info->control.rates[i].idx = -1; 748 continue; 749 } 750 751 rate = &sband->bitrates[info->control.rates[i].idx]; 752 753 /* set up short preamble */ 754 if (short_preamble && 755 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 756 info->control.rates[i].flags |= 757 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 758 759 /* set up G protection */ 760 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 761 rate->flags & IEEE80211_RATE_ERP_G) 762 info->control.rates[i].flags |= 763 IEEE80211_TX_RC_USE_CTS_PROTECT; 764 } 765 766 return TX_CONTINUE; 767 } 768 769 static ieee80211_tx_result debug_noinline 770 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 771 { 772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 773 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 774 u16 *seq; 775 u8 *qc; 776 int tid; 777 778 /* 779 * Packet injection may want to control the sequence 780 * number, if we have no matching interface then we 781 * neither assign one ourselves nor ask the driver to. 782 */ 783 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 784 return TX_CONTINUE; 785 786 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 787 return TX_CONTINUE; 788 789 if (ieee80211_hdrlen(hdr->frame_control) < 24) 790 return TX_CONTINUE; 791 792 /* 793 * Anything but QoS data that has a sequence number field 794 * (is long enough) gets a sequence number from the global 795 * counter. 796 */ 797 if (!ieee80211_is_data_qos(hdr->frame_control)) { 798 /* driver should assign sequence number */ 799 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 800 /* for pure STA mode without beacons, we can do it */ 801 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 802 tx->sdata->sequence_number += 0x10; 803 return TX_CONTINUE; 804 } 805 806 /* 807 * This should be true for injected/management frames only, for 808 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 809 * above since they are not QoS-data frames. 810 */ 811 if (!tx->sta) 812 return TX_CONTINUE; 813 814 /* include per-STA, per-TID sequence counter */ 815 816 qc = ieee80211_get_qos_ctl(hdr); 817 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 818 seq = &tx->sta->tid_seq[tid]; 819 820 hdr->seq_ctrl = cpu_to_le16(*seq); 821 822 /* Increase the sequence number. */ 823 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 824 825 return TX_CONTINUE; 826 } 827 828 static int ieee80211_fragment(struct ieee80211_local *local, 829 struct sk_buff *skb, int hdrlen, 830 int frag_threshold) 831 { 832 struct sk_buff *tail = skb, *tmp; 833 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 834 int pos = hdrlen + per_fragm; 835 int rem = skb->len - hdrlen - per_fragm; 836 837 if (WARN_ON(rem < 0)) 838 return -EINVAL; 839 840 while (rem) { 841 int fraglen = per_fragm; 842 843 if (fraglen > rem) 844 fraglen = rem; 845 rem -= fraglen; 846 tmp = dev_alloc_skb(local->tx_headroom + 847 frag_threshold + 848 IEEE80211_ENCRYPT_HEADROOM + 849 IEEE80211_ENCRYPT_TAILROOM); 850 if (!tmp) 851 return -ENOMEM; 852 tail->next = tmp; 853 tail = tmp; 854 skb_reserve(tmp, local->tx_headroom + 855 IEEE80211_ENCRYPT_HEADROOM); 856 /* copy control information */ 857 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 858 skb_copy_queue_mapping(tmp, skb); 859 tmp->priority = skb->priority; 860 tmp->dev = skb->dev; 861 862 /* copy header and data */ 863 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 864 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 865 866 pos += fraglen; 867 } 868 869 skb->len = hdrlen + per_fragm; 870 return 0; 871 } 872 873 static ieee80211_tx_result debug_noinline 874 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 875 { 876 struct sk_buff *skb = tx->skb; 877 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 878 struct ieee80211_hdr *hdr = (void *)skb->data; 879 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 880 int hdrlen; 881 int fragnum; 882 883 if (!(tx->flags & IEEE80211_TX_FRAGMENTED)) 884 return TX_CONTINUE; 885 886 /* 887 * Warn when submitting a fragmented A-MPDU frame and drop it. 888 * This scenario is handled in ieee80211_tx_prepare but extra 889 * caution taken here as fragmented ampdu may cause Tx stop. 890 */ 891 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 892 return TX_DROP; 893 894 hdrlen = ieee80211_hdrlen(hdr->frame_control); 895 896 /* internal error, why is TX_FRAGMENTED set? */ 897 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 898 return TX_DROP; 899 900 /* 901 * Now fragment the frame. This will allocate all the fragments and 902 * chain them (using skb as the first fragment) to skb->next. 903 * During transmission, we will remove the successfully transmitted 904 * fragments from this list. When the low-level driver rejects one 905 * of the fragments then we will simply pretend to accept the skb 906 * but store it away as pending. 907 */ 908 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) 909 return TX_DROP; 910 911 /* update duration/seq/flags of fragments */ 912 fragnum = 0; 913 do { 914 int next_len; 915 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 916 917 hdr = (void *)skb->data; 918 info = IEEE80211_SKB_CB(skb); 919 920 if (skb->next) { 921 hdr->frame_control |= morefrags; 922 next_len = skb->next->len; 923 /* 924 * No multi-rate retries for fragmented frames, that 925 * would completely throw off the NAV at other STAs. 926 */ 927 info->control.rates[1].idx = -1; 928 info->control.rates[2].idx = -1; 929 info->control.rates[3].idx = -1; 930 info->control.rates[4].idx = -1; 931 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 932 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 933 } else { 934 hdr->frame_control &= ~morefrags; 935 next_len = 0; 936 } 937 hdr->duration_id = ieee80211_duration(tx, 0, next_len); 938 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 939 fragnum++; 940 } while ((skb = skb->next)); 941 942 return TX_CONTINUE; 943 } 944 945 static ieee80211_tx_result debug_noinline 946 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 947 { 948 struct sk_buff *skb = tx->skb; 949 950 if (!tx->sta) 951 return TX_CONTINUE; 952 953 tx->sta->tx_packets++; 954 do { 955 tx->sta->tx_fragments++; 956 tx->sta->tx_bytes += skb->len; 957 } while ((skb = skb->next)); 958 959 return TX_CONTINUE; 960 } 961 962 static ieee80211_tx_result debug_noinline 963 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 964 { 965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 966 967 if (!tx->key) 968 return TX_CONTINUE; 969 970 switch (tx->key->conf.cipher) { 971 case WLAN_CIPHER_SUITE_WEP40: 972 case WLAN_CIPHER_SUITE_WEP104: 973 return ieee80211_crypto_wep_encrypt(tx); 974 case WLAN_CIPHER_SUITE_TKIP: 975 return ieee80211_crypto_tkip_encrypt(tx); 976 case WLAN_CIPHER_SUITE_CCMP: 977 return ieee80211_crypto_ccmp_encrypt(tx); 978 case WLAN_CIPHER_SUITE_AES_CMAC: 979 return ieee80211_crypto_aes_cmac_encrypt(tx); 980 default: 981 /* handle hw-only algorithm */ 982 if (info->control.hw_key) { 983 ieee80211_tx_set_protected(tx); 984 return TX_CONTINUE; 985 } 986 break; 987 988 } 989 990 return TX_DROP; 991 } 992 993 static ieee80211_tx_result debug_noinline 994 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 995 { 996 struct sk_buff *skb = tx->skb; 997 struct ieee80211_hdr *hdr; 998 int next_len; 999 bool group_addr; 1000 1001 do { 1002 hdr = (void *) skb->data; 1003 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1004 break; /* must not overwrite AID */ 1005 next_len = skb->next ? skb->next->len : 0; 1006 group_addr = is_multicast_ether_addr(hdr->addr1); 1007 1008 hdr->duration_id = 1009 ieee80211_duration(tx, group_addr, next_len); 1010 } while ((skb = skb->next)); 1011 1012 return TX_CONTINUE; 1013 } 1014 1015 /* actual transmit path */ 1016 1017 /* 1018 * deal with packet injection down monitor interface 1019 * with Radiotap Header -- only called for monitor mode interface 1020 */ 1021 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx, 1022 struct sk_buff *skb) 1023 { 1024 /* 1025 * this is the moment to interpret and discard the radiotap header that 1026 * must be at the start of the packet injected in Monitor mode 1027 * 1028 * Need to take some care with endian-ness since radiotap 1029 * args are little-endian 1030 */ 1031 1032 struct ieee80211_radiotap_iterator iterator; 1033 struct ieee80211_radiotap_header *rthdr = 1034 (struct ieee80211_radiotap_header *) skb->data; 1035 struct ieee80211_supported_band *sband; 1036 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1037 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1038 NULL); 1039 1040 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 1041 1042 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1043 tx->flags &= ~IEEE80211_TX_FRAGMENTED; 1044 1045 /* 1046 * for every radiotap entry that is present 1047 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1048 * entries present, or -EINVAL on error) 1049 */ 1050 1051 while (!ret) { 1052 ret = ieee80211_radiotap_iterator_next(&iterator); 1053 1054 if (ret) 1055 continue; 1056 1057 /* see if this argument is something we can use */ 1058 switch (iterator.this_arg_index) { 1059 /* 1060 * You must take care when dereferencing iterator.this_arg 1061 * for multibyte types... the pointer is not aligned. Use 1062 * get_unaligned((type *)iterator.this_arg) to dereference 1063 * iterator.this_arg for type "type" safely on all arches. 1064 */ 1065 case IEEE80211_RADIOTAP_FLAGS: 1066 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1067 /* 1068 * this indicates that the skb we have been 1069 * handed has the 32-bit FCS CRC at the end... 1070 * we should react to that by snipping it off 1071 * because it will be recomputed and added 1072 * on transmission 1073 */ 1074 if (skb->len < (iterator._max_length + FCS_LEN)) 1075 return false; 1076 1077 skb_trim(skb, skb->len - FCS_LEN); 1078 } 1079 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1080 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1081 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1082 tx->flags |= IEEE80211_TX_FRAGMENTED; 1083 break; 1084 1085 /* 1086 * Please update the file 1087 * Documentation/networking/mac80211-injection.txt 1088 * when parsing new fields here. 1089 */ 1090 1091 default: 1092 break; 1093 } 1094 } 1095 1096 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1097 return false; 1098 1099 /* 1100 * remove the radiotap header 1101 * iterator->_max_length was sanity-checked against 1102 * skb->len by iterator init 1103 */ 1104 skb_pull(skb, iterator._max_length); 1105 1106 return true; 1107 } 1108 1109 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1110 struct sk_buff *skb, 1111 struct ieee80211_tx_info *info, 1112 struct tid_ampdu_tx *tid_tx, 1113 int tid) 1114 { 1115 bool queued = false; 1116 1117 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 info->flags |= IEEE80211_TX_CTL_AMPDU; 1119 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1120 /* 1121 * nothing -- this aggregation session is being started 1122 * but that might still fail with the driver 1123 */ 1124 } else { 1125 spin_lock(&tx->sta->lock); 1126 /* 1127 * Need to re-check now, because we may get here 1128 * 1129 * 1) in the window during which the setup is actually 1130 * already done, but not marked yet because not all 1131 * packets are spliced over to the driver pending 1132 * queue yet -- if this happened we acquire the lock 1133 * either before or after the splice happens, but 1134 * need to recheck which of these cases happened. 1135 * 1136 * 2) during session teardown, if the OPERATIONAL bit 1137 * was cleared due to the teardown but the pointer 1138 * hasn't been assigned NULL yet (or we loaded it 1139 * before it was assigned) -- in this case it may 1140 * now be NULL which means we should just let the 1141 * packet pass through because splicing the frames 1142 * back is already done. 1143 */ 1144 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid]; 1145 1146 if (!tid_tx) { 1147 /* do nothing, let packet pass through */ 1148 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1149 info->flags |= IEEE80211_TX_CTL_AMPDU; 1150 } else { 1151 queued = true; 1152 info->control.vif = &tx->sdata->vif; 1153 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1154 __skb_queue_tail(&tid_tx->pending, skb); 1155 } 1156 spin_unlock(&tx->sta->lock); 1157 } 1158 1159 return queued; 1160 } 1161 1162 /* 1163 * initialises @tx 1164 */ 1165 static ieee80211_tx_result 1166 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1167 struct ieee80211_tx_data *tx, 1168 struct sk_buff *skb) 1169 { 1170 struct ieee80211_local *local = sdata->local; 1171 struct ieee80211_hdr *hdr; 1172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1173 int hdrlen, tid; 1174 u8 *qc; 1175 1176 memset(tx, 0, sizeof(*tx)); 1177 tx->skb = skb; 1178 tx->local = local; 1179 tx->sdata = sdata; 1180 tx->channel = local->hw.conf.channel; 1181 /* 1182 * Set this flag (used below to indicate "automatic fragmentation"), 1183 * it will be cleared/left by radiotap as desired. 1184 */ 1185 tx->flags |= IEEE80211_TX_FRAGMENTED; 1186 1187 /* process and remove the injection radiotap header */ 1188 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) { 1189 if (!__ieee80211_parse_tx_radiotap(tx, skb)) 1190 return TX_DROP; 1191 1192 /* 1193 * __ieee80211_parse_tx_radiotap has now removed 1194 * the radiotap header that was present and pre-filled 1195 * 'tx' with tx control information. 1196 */ 1197 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP; 1198 } 1199 1200 /* 1201 * If this flag is set to true anywhere, and we get here, 1202 * we are doing the needed processing, so remove the flag 1203 * now. 1204 */ 1205 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1206 1207 hdr = (struct ieee80211_hdr *) skb->data; 1208 1209 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1210 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1211 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1212 return TX_DROP; 1213 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1214 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1215 } 1216 if (!tx->sta) 1217 tx->sta = sta_info_get(sdata, hdr->addr1); 1218 1219 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1220 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) { 1221 struct tid_ampdu_tx *tid_tx; 1222 1223 qc = ieee80211_get_qos_ctl(hdr); 1224 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1225 1226 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1227 if (tid_tx) { 1228 bool queued; 1229 1230 queued = ieee80211_tx_prep_agg(tx, skb, info, 1231 tid_tx, tid); 1232 1233 if (unlikely(queued)) 1234 return TX_QUEUED; 1235 } 1236 } 1237 1238 if (is_multicast_ether_addr(hdr->addr1)) { 1239 tx->flags &= ~IEEE80211_TX_UNICAST; 1240 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1241 } else { 1242 tx->flags |= IEEE80211_TX_UNICAST; 1243 if (unlikely(local->wifi_wme_noack_test)) 1244 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1245 else 1246 info->flags &= ~IEEE80211_TX_CTL_NO_ACK; 1247 } 1248 1249 if (tx->flags & IEEE80211_TX_FRAGMENTED) { 1250 if ((tx->flags & IEEE80211_TX_UNICAST) && 1251 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold && 1252 !(info->flags & IEEE80211_TX_CTL_AMPDU)) 1253 tx->flags |= IEEE80211_TX_FRAGMENTED; 1254 else 1255 tx->flags &= ~IEEE80211_TX_FRAGMENTED; 1256 } 1257 1258 if (!tx->sta) 1259 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1260 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1261 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1262 1263 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1264 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { 1265 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; 1266 tx->ethertype = (pos[0] << 8) | pos[1]; 1267 } 1268 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1269 1270 return TX_CONTINUE; 1271 } 1272 1273 static int __ieee80211_tx(struct ieee80211_local *local, 1274 struct sk_buff **skbp, 1275 struct sta_info *sta, 1276 bool txpending) 1277 { 1278 struct sk_buff *skb = *skbp, *next; 1279 struct ieee80211_tx_info *info; 1280 struct ieee80211_sub_if_data *sdata; 1281 unsigned long flags; 1282 int ret, len; 1283 bool fragm = false; 1284 1285 while (skb) { 1286 int q = skb_get_queue_mapping(skb); 1287 1288 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1289 ret = IEEE80211_TX_OK; 1290 if (local->queue_stop_reasons[q] || 1291 (!txpending && !skb_queue_empty(&local->pending[q]))) 1292 ret = IEEE80211_TX_PENDING; 1293 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1294 if (ret != IEEE80211_TX_OK) 1295 return ret; 1296 1297 info = IEEE80211_SKB_CB(skb); 1298 1299 if (fragm) 1300 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 1301 IEEE80211_TX_CTL_FIRST_FRAGMENT); 1302 1303 next = skb->next; 1304 len = skb->len; 1305 1306 if (next) 1307 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 1308 1309 sdata = vif_to_sdata(info->control.vif); 1310 1311 switch (sdata->vif.type) { 1312 case NL80211_IFTYPE_MONITOR: 1313 info->control.vif = NULL; 1314 break; 1315 case NL80211_IFTYPE_AP_VLAN: 1316 info->control.vif = &container_of(sdata->bss, 1317 struct ieee80211_sub_if_data, u.ap)->vif; 1318 break; 1319 default: 1320 /* keep */ 1321 break; 1322 } 1323 1324 if (sta && sta->uploaded) 1325 info->control.sta = &sta->sta; 1326 else 1327 info->control.sta = NULL; 1328 1329 ret = drv_tx(local, skb); 1330 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { 1331 dev_kfree_skb(skb); 1332 ret = NETDEV_TX_OK; 1333 } 1334 if (ret != NETDEV_TX_OK) { 1335 info->control.vif = &sdata->vif; 1336 return IEEE80211_TX_AGAIN; 1337 } 1338 1339 *skbp = skb = next; 1340 ieee80211_led_tx(local, 1); 1341 fragm = true; 1342 } 1343 1344 return IEEE80211_TX_OK; 1345 } 1346 1347 /* 1348 * Invoke TX handlers, return 0 on success and non-zero if the 1349 * frame was dropped or queued. 1350 */ 1351 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1352 { 1353 struct sk_buff *skb = tx->skb; 1354 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1355 ieee80211_tx_result res = TX_DROP; 1356 1357 #define CALL_TXH(txh) \ 1358 do { \ 1359 res = txh(tx); \ 1360 if (res != TX_CONTINUE) \ 1361 goto txh_done; \ 1362 } while (0) 1363 1364 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1365 CALL_TXH(ieee80211_tx_h_check_assoc); 1366 CALL_TXH(ieee80211_tx_h_ps_buf); 1367 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1368 CALL_TXH(ieee80211_tx_h_select_key); 1369 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1370 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1371 1372 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) 1373 goto txh_done; 1374 1375 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1376 CALL_TXH(ieee80211_tx_h_sequence); 1377 CALL_TXH(ieee80211_tx_h_fragment); 1378 /* handlers after fragment must be aware of tx info fragmentation! */ 1379 CALL_TXH(ieee80211_tx_h_stats); 1380 CALL_TXH(ieee80211_tx_h_encrypt); 1381 CALL_TXH(ieee80211_tx_h_calculate_duration); 1382 #undef CALL_TXH 1383 1384 txh_done: 1385 if (unlikely(res == TX_DROP)) { 1386 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1387 while (skb) { 1388 struct sk_buff *next; 1389 1390 next = skb->next; 1391 dev_kfree_skb(skb); 1392 skb = next; 1393 } 1394 return -1; 1395 } else if (unlikely(res == TX_QUEUED)) { 1396 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1397 return -1; 1398 } 1399 1400 return 0; 1401 } 1402 1403 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1404 struct sk_buff *skb, bool txpending) 1405 { 1406 struct ieee80211_local *local = sdata->local; 1407 struct ieee80211_tx_data tx; 1408 ieee80211_tx_result res_prepare; 1409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1410 struct sk_buff *next; 1411 unsigned long flags; 1412 int ret, retries; 1413 u16 queue; 1414 1415 queue = skb_get_queue_mapping(skb); 1416 1417 if (unlikely(skb->len < 10)) { 1418 dev_kfree_skb(skb); 1419 return; 1420 } 1421 1422 rcu_read_lock(); 1423 1424 /* initialises tx */ 1425 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1426 1427 if (unlikely(res_prepare == TX_DROP)) { 1428 dev_kfree_skb(skb); 1429 rcu_read_unlock(); 1430 return; 1431 } else if (unlikely(res_prepare == TX_QUEUED)) { 1432 rcu_read_unlock(); 1433 return; 1434 } 1435 1436 tx.channel = local->hw.conf.channel; 1437 info->band = tx.channel->band; 1438 1439 if (invoke_tx_handlers(&tx)) 1440 goto out; 1441 1442 retries = 0; 1443 retry: 1444 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); 1445 switch (ret) { 1446 case IEEE80211_TX_OK: 1447 break; 1448 case IEEE80211_TX_AGAIN: 1449 /* 1450 * Since there are no fragmented frames on A-MPDU 1451 * queues, there's no reason for a driver to reject 1452 * a frame there, warn and drop it. 1453 */ 1454 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 1455 goto drop; 1456 /* fall through */ 1457 case IEEE80211_TX_PENDING: 1458 skb = tx.skb; 1459 1460 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1461 1462 if (local->queue_stop_reasons[queue] || 1463 !skb_queue_empty(&local->pending[queue])) { 1464 /* 1465 * if queue is stopped, queue up frames for later 1466 * transmission from the tasklet 1467 */ 1468 do { 1469 next = skb->next; 1470 skb->next = NULL; 1471 if (unlikely(txpending)) 1472 __skb_queue_head(&local->pending[queue], 1473 skb); 1474 else 1475 __skb_queue_tail(&local->pending[queue], 1476 skb); 1477 } while ((skb = next)); 1478 1479 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1480 flags); 1481 } else { 1482 /* 1483 * otherwise retry, but this is a race condition or 1484 * a driver bug (which we warn about if it persists) 1485 */ 1486 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1487 flags); 1488 1489 retries++; 1490 if (WARN(retries > 10, "tx refused but queue active\n")) 1491 goto drop; 1492 goto retry; 1493 } 1494 } 1495 out: 1496 rcu_read_unlock(); 1497 return; 1498 1499 drop: 1500 rcu_read_unlock(); 1501 1502 skb = tx.skb; 1503 while (skb) { 1504 next = skb->next; 1505 dev_kfree_skb(skb); 1506 skb = next; 1507 } 1508 } 1509 1510 /* device xmit handlers */ 1511 1512 static int ieee80211_skb_resize(struct ieee80211_local *local, 1513 struct sk_buff *skb, 1514 int head_need, bool may_encrypt) 1515 { 1516 int tail_need = 0; 1517 1518 /* 1519 * This could be optimised, devices that do full hardware 1520 * crypto (including TKIP MMIC) need no tailroom... But we 1521 * have no drivers for such devices currently. 1522 */ 1523 if (may_encrypt) { 1524 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1525 tail_need -= skb_tailroom(skb); 1526 tail_need = max_t(int, tail_need, 0); 1527 } 1528 1529 if (head_need || tail_need) { 1530 /* Sorry. Can't account for this any more */ 1531 skb_orphan(skb); 1532 } 1533 1534 if (skb_header_cloned(skb)) 1535 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1536 else 1537 I802_DEBUG_INC(local->tx_expand_skb_head); 1538 1539 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1540 wiphy_debug(local->hw.wiphy, 1541 "failed to reallocate TX buffer\n"); 1542 return -ENOMEM; 1543 } 1544 1545 /* update truesize too */ 1546 skb->truesize += head_need + tail_need; 1547 1548 return 0; 1549 } 1550 1551 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1552 struct sk_buff *skb) 1553 { 1554 struct ieee80211_local *local = sdata->local; 1555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1557 struct ieee80211_sub_if_data *tmp_sdata; 1558 int headroom; 1559 bool may_encrypt; 1560 1561 rcu_read_lock(); 1562 1563 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) { 1564 int hdrlen; 1565 u16 len_rthdr; 1566 1567 info->flags |= IEEE80211_TX_CTL_INJECTED | 1568 IEEE80211_TX_INTFL_HAS_RADIOTAP; 1569 1570 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1571 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1572 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1573 1574 /* check the header is complete in the frame */ 1575 if (likely(skb->len >= len_rthdr + hdrlen)) { 1576 /* 1577 * We process outgoing injected frames that have a 1578 * local address we handle as though they are our 1579 * own frames. 1580 * This code here isn't entirely correct, the local 1581 * MAC address is not necessarily enough to find 1582 * the interface to use; for that proper VLAN/WDS 1583 * support we will need a different mechanism. 1584 */ 1585 1586 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, 1587 list) { 1588 if (!ieee80211_sdata_running(tmp_sdata)) 1589 continue; 1590 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP) 1591 continue; 1592 if (compare_ether_addr(tmp_sdata->vif.addr, 1593 hdr->addr2) == 0) { 1594 sdata = tmp_sdata; 1595 break; 1596 } 1597 } 1598 } 1599 } 1600 1601 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1602 1603 headroom = local->tx_headroom; 1604 if (may_encrypt) 1605 headroom += IEEE80211_ENCRYPT_HEADROOM; 1606 headroom -= skb_headroom(skb); 1607 headroom = max_t(int, 0, headroom); 1608 1609 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) { 1610 dev_kfree_skb(skb); 1611 rcu_read_unlock(); 1612 return; 1613 } 1614 1615 hdr = (struct ieee80211_hdr *) skb->data; 1616 info->control.vif = &sdata->vif; 1617 1618 if (ieee80211_vif_is_mesh(&sdata->vif) && 1619 ieee80211_is_data(hdr->frame_control) && 1620 !is_multicast_ether_addr(hdr->addr1)) 1621 if (mesh_nexthop_lookup(skb, sdata)) { 1622 /* skb queued: don't free */ 1623 rcu_read_unlock(); 1624 return; 1625 } 1626 1627 ieee80211_set_qos_hdr(local, skb); 1628 ieee80211_tx(sdata, skb, false); 1629 rcu_read_unlock(); 1630 } 1631 1632 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1633 struct net_device *dev) 1634 { 1635 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1636 struct ieee80211_channel *chan = local->hw.conf.channel; 1637 struct ieee80211_radiotap_header *prthdr = 1638 (struct ieee80211_radiotap_header *)skb->data; 1639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1640 u16 len_rthdr; 1641 1642 /* 1643 * Frame injection is not allowed if beaconing is not allowed 1644 * or if we need radar detection. Beaconing is usually not allowed when 1645 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1646 * Passive scan is also used in world regulatory domains where 1647 * your country is not known and as such it should be treated as 1648 * NO TX unless the channel is explicitly allowed in which case 1649 * your current regulatory domain would not have the passive scan 1650 * flag. 1651 * 1652 * Since AP mode uses monitor interfaces to inject/TX management 1653 * frames we can make AP mode the exception to this rule once it 1654 * supports radar detection as its implementation can deal with 1655 * radar detection by itself. We can do that later by adding a 1656 * monitor flag interfaces used for AP support. 1657 */ 1658 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1659 IEEE80211_CHAN_PASSIVE_SCAN))) 1660 goto fail; 1661 1662 /* check for not even having the fixed radiotap header part */ 1663 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1664 goto fail; /* too short to be possibly valid */ 1665 1666 /* is it a header version we can trust to find length from? */ 1667 if (unlikely(prthdr->it_version)) 1668 goto fail; /* only version 0 is supported */ 1669 1670 /* then there must be a radiotap header with a length we can use */ 1671 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1672 1673 /* does the skb contain enough to deliver on the alleged length? */ 1674 if (unlikely(skb->len < len_rthdr)) 1675 goto fail; /* skb too short for claimed rt header extent */ 1676 1677 /* 1678 * fix up the pointers accounting for the radiotap 1679 * header still being in there. We are being given 1680 * a precooked IEEE80211 header so no need for 1681 * normal processing 1682 */ 1683 skb_set_mac_header(skb, len_rthdr); 1684 /* 1685 * these are just fixed to the end of the rt area since we 1686 * don't have any better information and at this point, nobody cares 1687 */ 1688 skb_set_network_header(skb, len_rthdr); 1689 skb_set_transport_header(skb, len_rthdr); 1690 1691 memset(info, 0, sizeof(*info)); 1692 1693 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1694 1695 /* pass the radiotap header up to xmit */ 1696 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb); 1697 return NETDEV_TX_OK; 1698 1699 fail: 1700 dev_kfree_skb(skb); 1701 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1702 } 1703 1704 /** 1705 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1706 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1707 * @skb: packet to be sent 1708 * @dev: incoming interface 1709 * 1710 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1711 * not be freed, and caller is responsible for either retrying later or freeing 1712 * skb). 1713 * 1714 * This function takes in an Ethernet header and encapsulates it with suitable 1715 * IEEE 802.11 header based on which interface the packet is coming in. The 1716 * encapsulated packet will then be passed to master interface, wlan#.11, for 1717 * transmission (through low-level driver). 1718 */ 1719 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1720 struct net_device *dev) 1721 { 1722 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1723 struct ieee80211_local *local = sdata->local; 1724 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1725 int ret = NETDEV_TX_BUSY, head_need; 1726 u16 ethertype, hdrlen, meshhdrlen = 0; 1727 __le16 fc; 1728 struct ieee80211_hdr hdr; 1729 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1730 const u8 *encaps_data; 1731 int encaps_len, skip_header_bytes; 1732 int nh_pos, h_pos; 1733 struct sta_info *sta = NULL; 1734 u32 sta_flags = 0; 1735 1736 if (unlikely(skb->len < ETH_HLEN)) { 1737 ret = NETDEV_TX_OK; 1738 goto fail; 1739 } 1740 1741 nh_pos = skb_network_header(skb) - skb->data; 1742 h_pos = skb_transport_header(skb) - skb->data; 1743 1744 /* convert Ethernet header to proper 802.11 header (based on 1745 * operation mode) */ 1746 ethertype = (skb->data[12] << 8) | skb->data[13]; 1747 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1748 1749 switch (sdata->vif.type) { 1750 case NL80211_IFTYPE_AP_VLAN: 1751 rcu_read_lock(); 1752 sta = rcu_dereference(sdata->u.vlan.sta); 1753 if (sta) { 1754 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1755 /* RA TA DA SA */ 1756 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1757 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1758 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1759 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1760 hdrlen = 30; 1761 sta_flags = get_sta_flags(sta); 1762 } 1763 rcu_read_unlock(); 1764 if (sta) 1765 break; 1766 /* fall through */ 1767 case NL80211_IFTYPE_AP: 1768 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1769 /* DA BSSID SA */ 1770 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1771 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1772 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1773 hdrlen = 24; 1774 break; 1775 case NL80211_IFTYPE_WDS: 1776 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1777 /* RA TA DA SA */ 1778 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1779 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1780 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1781 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1782 hdrlen = 30; 1783 break; 1784 #ifdef CONFIG_MAC80211_MESH 1785 case NL80211_IFTYPE_MESH_POINT: 1786 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1787 /* Do not send frames with mesh_ttl == 0 */ 1788 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1789 ret = NETDEV_TX_OK; 1790 goto fail; 1791 } 1792 1793 if (compare_ether_addr(sdata->vif.addr, 1794 skb->data + ETH_ALEN) == 0) { 1795 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1796 skb->data, skb->data + ETH_ALEN); 1797 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1798 sdata, NULL, NULL, NULL); 1799 } else { 1800 /* packet from other interface */ 1801 struct mesh_path *mppath; 1802 int is_mesh_mcast = 1; 1803 const u8 *mesh_da; 1804 1805 rcu_read_lock(); 1806 if (is_multicast_ether_addr(skb->data)) 1807 /* DA TA mSA AE:SA */ 1808 mesh_da = skb->data; 1809 else { 1810 static const u8 bcast[ETH_ALEN] = 1811 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1812 1813 mppath = mpp_path_lookup(skb->data, sdata); 1814 if (mppath) { 1815 /* RA TA mDA mSA AE:DA SA */ 1816 mesh_da = mppath->mpp; 1817 is_mesh_mcast = 0; 1818 } else { 1819 /* DA TA mSA AE:SA */ 1820 mesh_da = bcast; 1821 } 1822 } 1823 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1824 mesh_da, sdata->vif.addr); 1825 rcu_read_unlock(); 1826 if (is_mesh_mcast) 1827 meshhdrlen = 1828 ieee80211_new_mesh_header(&mesh_hdr, 1829 sdata, 1830 skb->data + ETH_ALEN, 1831 NULL, 1832 NULL); 1833 else 1834 meshhdrlen = 1835 ieee80211_new_mesh_header(&mesh_hdr, 1836 sdata, 1837 NULL, 1838 skb->data, 1839 skb->data + ETH_ALEN); 1840 1841 } 1842 break; 1843 #endif 1844 case NL80211_IFTYPE_STATION: 1845 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1846 if (sdata->u.mgd.use_4addr && 1847 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1848 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1849 /* RA TA DA SA */ 1850 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1851 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1852 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1853 hdrlen = 30; 1854 } else { 1855 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1856 /* BSSID SA DA */ 1857 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1858 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1859 hdrlen = 24; 1860 } 1861 break; 1862 case NL80211_IFTYPE_ADHOC: 1863 /* DA SA BSSID */ 1864 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1865 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1866 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1867 hdrlen = 24; 1868 break; 1869 default: 1870 ret = NETDEV_TX_OK; 1871 goto fail; 1872 } 1873 1874 /* 1875 * There's no need to try to look up the destination 1876 * if it is a multicast address (which can only happen 1877 * in AP mode) 1878 */ 1879 if (!is_multicast_ether_addr(hdr.addr1)) { 1880 rcu_read_lock(); 1881 sta = sta_info_get(sdata, hdr.addr1); 1882 if (sta) 1883 sta_flags = get_sta_flags(sta); 1884 rcu_read_unlock(); 1885 } 1886 1887 /* receiver and we are QoS enabled, use a QoS type frame */ 1888 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) { 1889 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1890 hdrlen += 2; 1891 } 1892 1893 /* 1894 * Drop unicast frames to unauthorised stations unless they are 1895 * EAPOL frames from the local station. 1896 */ 1897 if (!ieee80211_vif_is_mesh(&sdata->vif) && 1898 unlikely(!is_multicast_ether_addr(hdr.addr1) && 1899 !(sta_flags & WLAN_STA_AUTHORIZED) && 1900 !(cpu_to_be16(ethertype) == sdata->control_port_protocol && 1901 compare_ether_addr(sdata->vif.addr, 1902 skb->data + ETH_ALEN) == 0))) { 1903 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1904 if (net_ratelimit()) 1905 printk(KERN_DEBUG "%s: dropped frame to %pM" 1906 " (unauthorized port)\n", dev->name, 1907 hdr.addr1); 1908 #endif 1909 1910 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1911 1912 ret = NETDEV_TX_OK; 1913 goto fail; 1914 } 1915 1916 hdr.frame_control = fc; 1917 hdr.duration_id = 0; 1918 hdr.seq_ctrl = 0; 1919 1920 skip_header_bytes = ETH_HLEN; 1921 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 1922 encaps_data = bridge_tunnel_header; 1923 encaps_len = sizeof(bridge_tunnel_header); 1924 skip_header_bytes -= 2; 1925 } else if (ethertype >= 0x600) { 1926 encaps_data = rfc1042_header; 1927 encaps_len = sizeof(rfc1042_header); 1928 skip_header_bytes -= 2; 1929 } else { 1930 encaps_data = NULL; 1931 encaps_len = 0; 1932 } 1933 1934 skb_pull(skb, skip_header_bytes); 1935 nh_pos -= skip_header_bytes; 1936 h_pos -= skip_header_bytes; 1937 1938 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 1939 1940 /* 1941 * So we need to modify the skb header and hence need a copy of 1942 * that. The head_need variable above doesn't, so far, include 1943 * the needed header space that we don't need right away. If we 1944 * can, then we don't reallocate right now but only after the 1945 * frame arrives at the master device (if it does...) 1946 * 1947 * If we cannot, however, then we will reallocate to include all 1948 * the ever needed space. Also, if we need to reallocate it anyway, 1949 * make it big enough for everything we may ever need. 1950 */ 1951 1952 if (head_need > 0 || skb_cloned(skb)) { 1953 head_need += IEEE80211_ENCRYPT_HEADROOM; 1954 head_need += local->tx_headroom; 1955 head_need = max_t(int, 0, head_need); 1956 if (ieee80211_skb_resize(local, skb, head_need, true)) 1957 goto fail; 1958 } 1959 1960 if (encaps_data) { 1961 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 1962 nh_pos += encaps_len; 1963 h_pos += encaps_len; 1964 } 1965 1966 #ifdef CONFIG_MAC80211_MESH 1967 if (meshhdrlen > 0) { 1968 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 1969 nh_pos += meshhdrlen; 1970 h_pos += meshhdrlen; 1971 } 1972 #endif 1973 1974 if (ieee80211_is_data_qos(fc)) { 1975 __le16 *qos_control; 1976 1977 qos_control = (__le16*) skb_push(skb, 2); 1978 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 1979 /* 1980 * Maybe we could actually set some fields here, for now just 1981 * initialise to zero to indicate no special operation. 1982 */ 1983 *qos_control = 0; 1984 } else 1985 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 1986 1987 nh_pos += hdrlen; 1988 h_pos += hdrlen; 1989 1990 dev->stats.tx_packets++; 1991 dev->stats.tx_bytes += skb->len; 1992 1993 /* Update skb pointers to various headers since this modified frame 1994 * is going to go through Linux networking code that may potentially 1995 * need things like pointer to IP header. */ 1996 skb_set_mac_header(skb, 0); 1997 skb_set_network_header(skb, nh_pos); 1998 skb_set_transport_header(skb, h_pos); 1999 2000 memset(info, 0, sizeof(*info)); 2001 2002 dev->trans_start = jiffies; 2003 ieee80211_xmit(sdata, skb); 2004 2005 return NETDEV_TX_OK; 2006 2007 fail: 2008 if (ret == NETDEV_TX_OK) 2009 dev_kfree_skb(skb); 2010 2011 return ret; 2012 } 2013 2014 2015 /* 2016 * ieee80211_clear_tx_pending may not be called in a context where 2017 * it is possible that it packets could come in again. 2018 */ 2019 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2020 { 2021 int i; 2022 2023 for (i = 0; i < local->hw.queues; i++) 2024 skb_queue_purge(&local->pending[i]); 2025 } 2026 2027 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2028 struct sk_buff *skb) 2029 { 2030 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2031 struct ieee80211_sub_if_data *sdata; 2032 struct sta_info *sta; 2033 struct ieee80211_hdr *hdr; 2034 int ret; 2035 bool result = true; 2036 2037 sdata = vif_to_sdata(info->control.vif); 2038 2039 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2040 ieee80211_tx(sdata, skb, true); 2041 } else { 2042 hdr = (struct ieee80211_hdr *)skb->data; 2043 sta = sta_info_get(sdata, hdr->addr1); 2044 2045 ret = __ieee80211_tx(local, &skb, sta, true); 2046 if (ret != IEEE80211_TX_OK) 2047 result = false; 2048 } 2049 2050 return result; 2051 } 2052 2053 /* 2054 * Transmit all pending packets. Called from tasklet. 2055 */ 2056 void ieee80211_tx_pending(unsigned long data) 2057 { 2058 struct ieee80211_local *local = (struct ieee80211_local *)data; 2059 struct ieee80211_sub_if_data *sdata; 2060 unsigned long flags; 2061 int i; 2062 bool txok; 2063 2064 rcu_read_lock(); 2065 2066 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2067 for (i = 0; i < local->hw.queues; i++) { 2068 /* 2069 * If queue is stopped by something other than due to pending 2070 * frames, or we have no pending frames, proceed to next queue. 2071 */ 2072 if (local->queue_stop_reasons[i] || 2073 skb_queue_empty(&local->pending[i])) 2074 continue; 2075 2076 while (!skb_queue_empty(&local->pending[i])) { 2077 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2078 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2079 2080 if (WARN_ON(!info->control.vif)) { 2081 kfree_skb(skb); 2082 continue; 2083 } 2084 2085 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2086 flags); 2087 2088 txok = ieee80211_tx_pending_skb(local, skb); 2089 if (!txok) 2090 __skb_queue_head(&local->pending[i], skb); 2091 spin_lock_irqsave(&local->queue_stop_reason_lock, 2092 flags); 2093 if (!txok) 2094 break; 2095 } 2096 2097 if (skb_queue_empty(&local->pending[i])) 2098 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2099 netif_wake_subqueue(sdata->dev, i); 2100 } 2101 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2102 2103 rcu_read_unlock(); 2104 } 2105 2106 /* functions for drivers to get certain frames */ 2107 2108 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, 2109 struct sk_buff *skb, 2110 struct beacon_data *beacon) 2111 { 2112 u8 *pos, *tim; 2113 int aid0 = 0; 2114 int i, have_bits = 0, n1, n2; 2115 2116 /* Generate bitmap for TIM only if there are any STAs in power save 2117 * mode. */ 2118 if (atomic_read(&bss->num_sta_ps) > 0) 2119 /* in the hope that this is faster than 2120 * checking byte-for-byte */ 2121 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2122 IEEE80211_MAX_AID+1); 2123 2124 if (bss->dtim_count == 0) 2125 bss->dtim_count = beacon->dtim_period - 1; 2126 else 2127 bss->dtim_count--; 2128 2129 tim = pos = (u8 *) skb_put(skb, 6); 2130 *pos++ = WLAN_EID_TIM; 2131 *pos++ = 4; 2132 *pos++ = bss->dtim_count; 2133 *pos++ = beacon->dtim_period; 2134 2135 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2136 aid0 = 1; 2137 2138 if (have_bits) { 2139 /* Find largest even number N1 so that bits numbered 1 through 2140 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2141 * (N2 + 1) x 8 through 2007 are 0. */ 2142 n1 = 0; 2143 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2144 if (bss->tim[i]) { 2145 n1 = i & 0xfe; 2146 break; 2147 } 2148 } 2149 n2 = n1; 2150 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2151 if (bss->tim[i]) { 2152 n2 = i; 2153 break; 2154 } 2155 } 2156 2157 /* Bitmap control */ 2158 *pos++ = n1 | aid0; 2159 /* Part Virt Bitmap */ 2160 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2161 2162 tim[1] = n2 - n1 + 4; 2163 skb_put(skb, n2 - n1); 2164 } else { 2165 *pos++ = aid0; /* Bitmap control */ 2166 *pos++ = 0; /* Part Virt Bitmap */ 2167 } 2168 } 2169 2170 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2171 struct ieee80211_vif *vif, 2172 u16 *tim_offset, u16 *tim_length) 2173 { 2174 struct ieee80211_local *local = hw_to_local(hw); 2175 struct sk_buff *skb = NULL; 2176 struct ieee80211_tx_info *info; 2177 struct ieee80211_sub_if_data *sdata = NULL; 2178 struct ieee80211_if_ap *ap = NULL; 2179 struct beacon_data *beacon; 2180 struct ieee80211_supported_band *sband; 2181 enum ieee80211_band band = local->hw.conf.channel->band; 2182 struct ieee80211_tx_rate_control txrc; 2183 2184 sband = local->hw.wiphy->bands[band]; 2185 2186 rcu_read_lock(); 2187 2188 sdata = vif_to_sdata(vif); 2189 2190 if (tim_offset) 2191 *tim_offset = 0; 2192 if (tim_length) 2193 *tim_length = 0; 2194 2195 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2196 ap = &sdata->u.ap; 2197 beacon = rcu_dereference(ap->beacon); 2198 if (ap && beacon) { 2199 /* 2200 * headroom, head length, 2201 * tail length and maximum TIM length 2202 */ 2203 skb = dev_alloc_skb(local->tx_headroom + 2204 beacon->head_len + 2205 beacon->tail_len + 256); 2206 if (!skb) 2207 goto out; 2208 2209 skb_reserve(skb, local->tx_headroom); 2210 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2211 beacon->head_len); 2212 2213 /* 2214 * Not very nice, but we want to allow the driver to call 2215 * ieee80211_beacon_get() as a response to the set_tim() 2216 * callback. That, however, is already invoked under the 2217 * sta_lock to guarantee consistent and race-free update 2218 * of the tim bitmap in mac80211 and the driver. 2219 */ 2220 if (local->tim_in_locked_section) { 2221 ieee80211_beacon_add_tim(ap, skb, beacon); 2222 } else { 2223 unsigned long flags; 2224 2225 spin_lock_irqsave(&local->sta_lock, flags); 2226 ieee80211_beacon_add_tim(ap, skb, beacon); 2227 spin_unlock_irqrestore(&local->sta_lock, flags); 2228 } 2229 2230 if (tim_offset) 2231 *tim_offset = beacon->head_len; 2232 if (tim_length) 2233 *tim_length = skb->len - beacon->head_len; 2234 2235 if (beacon->tail) 2236 memcpy(skb_put(skb, beacon->tail_len), 2237 beacon->tail, beacon->tail_len); 2238 } else 2239 goto out; 2240 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2241 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2242 struct ieee80211_hdr *hdr; 2243 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2244 2245 if (!presp) 2246 goto out; 2247 2248 skb = skb_copy(presp, GFP_ATOMIC); 2249 if (!skb) 2250 goto out; 2251 2252 hdr = (struct ieee80211_hdr *) skb->data; 2253 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2254 IEEE80211_STYPE_BEACON); 2255 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2256 struct ieee80211_mgmt *mgmt; 2257 u8 *pos; 2258 2259 /* headroom, head length, tail length and maximum TIM length */ 2260 skb = dev_alloc_skb(local->tx_headroom + 400); 2261 if (!skb) 2262 goto out; 2263 2264 skb_reserve(skb, local->hw.extra_tx_headroom); 2265 mgmt = (struct ieee80211_mgmt *) 2266 skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 2267 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 2268 mgmt->frame_control = 2269 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2270 memset(mgmt->da, 0xff, ETH_ALEN); 2271 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2272 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2273 mgmt->u.beacon.beacon_int = 2274 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2275 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */ 2276 2277 pos = skb_put(skb, 2); 2278 *pos++ = WLAN_EID_SSID; 2279 *pos++ = 0x0; 2280 2281 mesh_mgmt_ies_add(skb, sdata); 2282 } else { 2283 WARN_ON(1); 2284 goto out; 2285 } 2286 2287 info = IEEE80211_SKB_CB(skb); 2288 2289 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2290 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2291 info->band = band; 2292 2293 memset(&txrc, 0, sizeof(txrc)); 2294 txrc.hw = hw; 2295 txrc.sband = sband; 2296 txrc.bss_conf = &sdata->vif.bss_conf; 2297 txrc.skb = skb; 2298 txrc.reported_rate.idx = -1; 2299 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2300 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2301 txrc.max_rate_idx = -1; 2302 else 2303 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2304 txrc.ap = true; 2305 rate_control_get_rate(sdata, NULL, &txrc); 2306 2307 info->control.vif = vif; 2308 2309 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2310 IEEE80211_TX_CTL_ASSIGN_SEQ | 2311 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2312 out: 2313 rcu_read_unlock(); 2314 return skb; 2315 } 2316 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2317 2318 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2319 struct ieee80211_vif *vif) 2320 { 2321 struct ieee80211_sub_if_data *sdata; 2322 struct ieee80211_if_managed *ifmgd; 2323 struct ieee80211_pspoll *pspoll; 2324 struct ieee80211_local *local; 2325 struct sk_buff *skb; 2326 2327 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2328 return NULL; 2329 2330 sdata = vif_to_sdata(vif); 2331 ifmgd = &sdata->u.mgd; 2332 local = sdata->local; 2333 2334 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2335 if (!skb) { 2336 printk(KERN_DEBUG "%s: failed to allocate buffer for " 2337 "pspoll template\n", sdata->name); 2338 return NULL; 2339 } 2340 skb_reserve(skb, local->hw.extra_tx_headroom); 2341 2342 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2343 memset(pspoll, 0, sizeof(*pspoll)); 2344 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2345 IEEE80211_STYPE_PSPOLL); 2346 pspoll->aid = cpu_to_le16(ifmgd->aid); 2347 2348 /* aid in PS-Poll has its two MSBs each set to 1 */ 2349 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2350 2351 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2352 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2353 2354 return skb; 2355 } 2356 EXPORT_SYMBOL(ieee80211_pspoll_get); 2357 2358 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2359 struct ieee80211_vif *vif) 2360 { 2361 struct ieee80211_hdr_3addr *nullfunc; 2362 struct ieee80211_sub_if_data *sdata; 2363 struct ieee80211_if_managed *ifmgd; 2364 struct ieee80211_local *local; 2365 struct sk_buff *skb; 2366 2367 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2368 return NULL; 2369 2370 sdata = vif_to_sdata(vif); 2371 ifmgd = &sdata->u.mgd; 2372 local = sdata->local; 2373 2374 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2375 if (!skb) { 2376 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " 2377 "template\n", sdata->name); 2378 return NULL; 2379 } 2380 skb_reserve(skb, local->hw.extra_tx_headroom); 2381 2382 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2383 sizeof(*nullfunc)); 2384 memset(nullfunc, 0, sizeof(*nullfunc)); 2385 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2386 IEEE80211_STYPE_NULLFUNC | 2387 IEEE80211_FCTL_TODS); 2388 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2389 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2390 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2391 2392 return skb; 2393 } 2394 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2395 2396 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2397 struct ieee80211_vif *vif, 2398 const u8 *ssid, size_t ssid_len, 2399 const u8 *ie, size_t ie_len) 2400 { 2401 struct ieee80211_sub_if_data *sdata; 2402 struct ieee80211_local *local; 2403 struct ieee80211_hdr_3addr *hdr; 2404 struct sk_buff *skb; 2405 size_t ie_ssid_len; 2406 u8 *pos; 2407 2408 sdata = vif_to_sdata(vif); 2409 local = sdata->local; 2410 ie_ssid_len = 2 + ssid_len; 2411 2412 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2413 ie_ssid_len + ie_len); 2414 if (!skb) { 2415 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 2416 "request template\n", sdata->name); 2417 return NULL; 2418 } 2419 2420 skb_reserve(skb, local->hw.extra_tx_headroom); 2421 2422 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2423 memset(hdr, 0, sizeof(*hdr)); 2424 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2425 IEEE80211_STYPE_PROBE_REQ); 2426 memset(hdr->addr1, 0xff, ETH_ALEN); 2427 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2428 memset(hdr->addr3, 0xff, ETH_ALEN); 2429 2430 pos = skb_put(skb, ie_ssid_len); 2431 *pos++ = WLAN_EID_SSID; 2432 *pos++ = ssid_len; 2433 if (ssid) 2434 memcpy(pos, ssid, ssid_len); 2435 pos += ssid_len; 2436 2437 if (ie) { 2438 pos = skb_put(skb, ie_len); 2439 memcpy(pos, ie, ie_len); 2440 } 2441 2442 return skb; 2443 } 2444 EXPORT_SYMBOL(ieee80211_probereq_get); 2445 2446 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2447 const void *frame, size_t frame_len, 2448 const struct ieee80211_tx_info *frame_txctl, 2449 struct ieee80211_rts *rts) 2450 { 2451 const struct ieee80211_hdr *hdr = frame; 2452 2453 rts->frame_control = 2454 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2455 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2456 frame_txctl); 2457 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2458 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2459 } 2460 EXPORT_SYMBOL(ieee80211_rts_get); 2461 2462 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2463 const void *frame, size_t frame_len, 2464 const struct ieee80211_tx_info *frame_txctl, 2465 struct ieee80211_cts *cts) 2466 { 2467 const struct ieee80211_hdr *hdr = frame; 2468 2469 cts->frame_control = 2470 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2471 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2472 frame_len, frame_txctl); 2473 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2474 } 2475 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2476 2477 struct sk_buff * 2478 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2479 struct ieee80211_vif *vif) 2480 { 2481 struct ieee80211_local *local = hw_to_local(hw); 2482 struct sk_buff *skb = NULL; 2483 struct sta_info *sta; 2484 struct ieee80211_tx_data tx; 2485 struct ieee80211_sub_if_data *sdata; 2486 struct ieee80211_if_ap *bss = NULL; 2487 struct beacon_data *beacon; 2488 struct ieee80211_tx_info *info; 2489 2490 sdata = vif_to_sdata(vif); 2491 bss = &sdata->u.ap; 2492 2493 rcu_read_lock(); 2494 beacon = rcu_dereference(bss->beacon); 2495 2496 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2497 goto out; 2498 2499 if (bss->dtim_count != 0) 2500 goto out; /* send buffered bc/mc only after DTIM beacon */ 2501 2502 while (1) { 2503 skb = skb_dequeue(&bss->ps_bc_buf); 2504 if (!skb) 2505 goto out; 2506 local->total_ps_buffered--; 2507 2508 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2509 struct ieee80211_hdr *hdr = 2510 (struct ieee80211_hdr *) skb->data; 2511 /* more buffered multicast/broadcast frames ==> set 2512 * MoreData flag in IEEE 802.11 header to inform PS 2513 * STAs */ 2514 hdr->frame_control |= 2515 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2516 } 2517 2518 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2519 break; 2520 dev_kfree_skb_any(skb); 2521 } 2522 2523 info = IEEE80211_SKB_CB(skb); 2524 2525 sta = tx.sta; 2526 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2527 tx.channel = local->hw.conf.channel; 2528 info->band = tx.channel->band; 2529 2530 if (invoke_tx_handlers(&tx)) 2531 skb = NULL; 2532 out: 2533 rcu_read_unlock(); 2534 2535 return skb; 2536 } 2537 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2538 2539 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 2540 { 2541 skb_set_mac_header(skb, 0); 2542 skb_set_network_header(skb, 0); 2543 skb_set_transport_header(skb, 0); 2544 2545 /* send all internal mgmt frames on VO */ 2546 skb_set_queue_mapping(skb, 0); 2547 2548 /* 2549 * The other path calling ieee80211_xmit is from the tasklet, 2550 * and while we can handle concurrent transmissions locking 2551 * requirements are that we do not come into tx with bhs on. 2552 */ 2553 local_bh_disable(); 2554 ieee80211_xmit(sdata, skb); 2555 local_bh_enable(); 2556 } 2557