1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * 12 * Transmit and frame generation functions. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/bitmap.h> 20 #include <linux/rcupdate.h> 21 #include <linux/export.h> 22 #include <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "led.h" 31 #include "mesh.h" 32 #include "wep.h" 33 #include "wpa.h" 34 #include "wme.h" 35 #include "rate.h" 36 37 /* misc utils */ 38 39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, 40 int next_frag_len) 41 { 42 int rate, mrate, erp, dur, i; 43 struct ieee80211_rate *txrate; 44 struct ieee80211_local *local = tx->local; 45 struct ieee80211_supported_band *sband; 46 struct ieee80211_hdr *hdr; 47 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 48 49 /* assume HW handles this */ 50 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) 51 return 0; 52 53 /* uh huh? */ 54 if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) 55 return 0; 56 57 sband = local->hw.wiphy->bands[tx->channel->band]; 58 txrate = &sband->bitrates[info->control.rates[0].idx]; 59 60 erp = txrate->flags & IEEE80211_RATE_ERP_G; 61 62 /* 63 * data and mgmt (except PS Poll): 64 * - during CFP: 32768 65 * - during contention period: 66 * if addr1 is group address: 0 67 * if more fragments = 0 and addr1 is individual address: time to 68 * transmit one ACK plus SIFS 69 * if more fragments = 1 and addr1 is individual address: time to 70 * transmit next fragment plus 2 x ACK plus 3 x SIFS 71 * 72 * IEEE 802.11, 9.6: 73 * - control response frame (CTS or ACK) shall be transmitted using the 74 * same rate as the immediately previous frame in the frame exchange 75 * sequence, if this rate belongs to the PHY mandatory rates, or else 76 * at the highest possible rate belonging to the PHY rates in the 77 * BSSBasicRateSet 78 */ 79 hdr = (struct ieee80211_hdr *)tx->skb->data; 80 if (ieee80211_is_ctl(hdr->frame_control)) { 81 /* TODO: These control frames are not currently sent by 82 * mac80211, but should they be implemented, this function 83 * needs to be updated to support duration field calculation. 84 * 85 * RTS: time needed to transmit pending data/mgmt frame plus 86 * one CTS frame plus one ACK frame plus 3 x SIFS 87 * CTS: duration of immediately previous RTS minus time 88 * required to transmit CTS and its SIFS 89 * ACK: 0 if immediately previous directed data/mgmt had 90 * more=0, with more=1 duration in ACK frame is duration 91 * from previous frame minus time needed to transmit ACK 92 * and its SIFS 93 * PS Poll: BIT(15) | BIT(14) | aid 94 */ 95 return 0; 96 } 97 98 /* data/mgmt */ 99 if (0 /* FIX: data/mgmt during CFP */) 100 return cpu_to_le16(32768); 101 102 if (group_addr) /* Group address as the destination - no ACK */ 103 return 0; 104 105 /* Individual destination address: 106 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 107 * CTS and ACK frames shall be transmitted using the highest rate in 108 * basic rate set that is less than or equal to the rate of the 109 * immediately previous frame and that is using the same modulation 110 * (CCK or OFDM). If no basic rate set matches with these requirements, 111 * the highest mandatory rate of the PHY that is less than or equal to 112 * the rate of the previous frame is used. 113 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 114 */ 115 rate = -1; 116 /* use lowest available if everything fails */ 117 mrate = sband->bitrates[0].bitrate; 118 for (i = 0; i < sband->n_bitrates; i++) { 119 struct ieee80211_rate *r = &sband->bitrates[i]; 120 121 if (r->bitrate > txrate->bitrate) 122 break; 123 124 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 125 rate = r->bitrate; 126 127 switch (sband->band) { 128 case IEEE80211_BAND_2GHZ: { 129 u32 flag; 130 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 131 flag = IEEE80211_RATE_MANDATORY_G; 132 else 133 flag = IEEE80211_RATE_MANDATORY_B; 134 if (r->flags & flag) 135 mrate = r->bitrate; 136 break; 137 } 138 case IEEE80211_BAND_5GHZ: 139 if (r->flags & IEEE80211_RATE_MANDATORY_A) 140 mrate = r->bitrate; 141 break; 142 case IEEE80211_NUM_BANDS: 143 WARN_ON(1); 144 break; 145 } 146 } 147 if (rate == -1) { 148 /* No matching basic rate found; use highest suitable mandatory 149 * PHY rate */ 150 rate = mrate; 151 } 152 153 /* Time needed to transmit ACK 154 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 155 * to closest integer */ 156 157 dur = ieee80211_frame_duration(local, 10, rate, erp, 158 tx->sdata->vif.bss_conf.use_short_preamble); 159 160 if (next_frag_len) { 161 /* Frame is fragmented: duration increases with time needed to 162 * transmit next fragment plus ACK and 2 x SIFS. */ 163 dur *= 2; /* ACK + SIFS */ 164 /* next fragment */ 165 dur += ieee80211_frame_duration(local, next_frag_len, 166 txrate->bitrate, erp, 167 tx->sdata->vif.bss_conf.use_short_preamble); 168 } 169 170 return cpu_to_le16(dur); 171 } 172 173 static inline int is_ieee80211_device(struct ieee80211_local *local, 174 struct net_device *dev) 175 { 176 return local == wdev_priv(dev->ieee80211_ptr); 177 } 178 179 /* tx handlers */ 180 static ieee80211_tx_result debug_noinline 181 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 182 { 183 struct ieee80211_local *local = tx->local; 184 struct ieee80211_if_managed *ifmgd; 185 186 /* driver doesn't support power save */ 187 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 188 return TX_CONTINUE; 189 190 /* hardware does dynamic power save */ 191 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 192 return TX_CONTINUE; 193 194 /* dynamic power save disabled */ 195 if (local->hw.conf.dynamic_ps_timeout <= 0) 196 return TX_CONTINUE; 197 198 /* we are scanning, don't enable power save */ 199 if (local->scanning) 200 return TX_CONTINUE; 201 202 if (!local->ps_sdata) 203 return TX_CONTINUE; 204 205 /* No point if we're going to suspend */ 206 if (local->quiescing) 207 return TX_CONTINUE; 208 209 /* dynamic ps is supported only in managed mode */ 210 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 211 return TX_CONTINUE; 212 213 ifmgd = &tx->sdata->u.mgd; 214 215 /* 216 * Don't wakeup from power save if u-apsd is enabled, voip ac has 217 * u-apsd enabled and the frame is in voip class. This effectively 218 * means that even if all access categories have u-apsd enabled, in 219 * practise u-apsd is only used with the voip ac. This is a 220 * workaround for the case when received voip class packets do not 221 * have correct qos tag for some reason, due the network or the 222 * peer application. 223 * 224 * Note: local->uapsd_queues access is racy here. If the value is 225 * changed via debugfs, user needs to reassociate manually to have 226 * everything in sync. 227 */ 228 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 229 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 230 && skb_get_queue_mapping(tx->skb) == 0) 231 return TX_CONTINUE; 232 233 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 234 ieee80211_stop_queues_by_reason(&local->hw, 235 IEEE80211_QUEUE_STOP_REASON_PS); 236 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 237 ieee80211_queue_work(&local->hw, 238 &local->dynamic_ps_disable_work); 239 } 240 241 /* Don't restart the timer if we're not disassociated */ 242 if (!ifmgd->associated) 243 return TX_CONTINUE; 244 245 mod_timer(&local->dynamic_ps_timer, jiffies + 246 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 247 248 return TX_CONTINUE; 249 } 250 251 static ieee80211_tx_result debug_noinline 252 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 253 { 254 255 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 256 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 257 bool assoc = false; 258 259 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 260 return TX_CONTINUE; 261 262 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 263 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 264 !ieee80211_is_probe_req(hdr->frame_control) && 265 !ieee80211_is_nullfunc(hdr->frame_control)) 266 /* 267 * When software scanning only nullfunc frames (to notify 268 * the sleep state to the AP) and probe requests (for the 269 * active scan) are allowed, all other frames should not be 270 * sent and we should not get here, but if we do 271 * nonetheless, drop them to avoid sending them 272 * off-channel. See the link below and 273 * ieee80211_start_scan() for more. 274 * 275 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 276 */ 277 return TX_DROP; 278 279 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 280 return TX_CONTINUE; 281 282 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 283 return TX_CONTINUE; 284 285 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 286 return TX_CONTINUE; 287 288 if (tx->sta) 289 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 290 291 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 292 if (unlikely(!assoc && 293 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC && 294 ieee80211_is_data(hdr->frame_control))) { 295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 296 printk(KERN_DEBUG "%s: dropped data frame to not " 297 "associated station %pM\n", 298 tx->sdata->name, hdr->addr1); 299 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 301 return TX_DROP; 302 } 303 } else { 304 if (unlikely(ieee80211_is_data(hdr->frame_control) && 305 tx->local->num_sta == 0 && 306 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) { 307 /* 308 * No associated STAs - no need to send multicast 309 * frames. 310 */ 311 return TX_DROP; 312 } 313 return TX_CONTINUE; 314 } 315 316 return TX_CONTINUE; 317 } 318 319 /* This function is called whenever the AP is about to exceed the maximum limit 320 * of buffered frames for power saving STAs. This situation should not really 321 * happen often during normal operation, so dropping the oldest buffered packet 322 * from each queue should be OK to make some room for new frames. */ 323 static void purge_old_ps_buffers(struct ieee80211_local *local) 324 { 325 int total = 0, purged = 0; 326 struct sk_buff *skb; 327 struct ieee80211_sub_if_data *sdata; 328 struct sta_info *sta; 329 330 /* 331 * virtual interfaces are protected by RCU 332 */ 333 rcu_read_lock(); 334 335 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 336 struct ieee80211_if_ap *ap; 337 if (sdata->vif.type != NL80211_IFTYPE_AP) 338 continue; 339 ap = &sdata->u.ap; 340 skb = skb_dequeue(&ap->ps_bc_buf); 341 if (skb) { 342 purged++; 343 dev_kfree_skb(skb); 344 } 345 total += skb_queue_len(&ap->ps_bc_buf); 346 } 347 348 /* 349 * Drop one frame from each station from the lowest-priority 350 * AC that has frames at all. 351 */ 352 list_for_each_entry_rcu(sta, &local->sta_list, list) { 353 int ac; 354 355 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 356 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 357 total += skb_queue_len(&sta->ps_tx_buf[ac]); 358 if (skb) { 359 purged++; 360 dev_kfree_skb(skb); 361 break; 362 } 363 } 364 } 365 366 rcu_read_unlock(); 367 368 local->total_ps_buffered = total; 369 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 370 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n", 371 purged); 372 #endif 373 } 374 375 static ieee80211_tx_result 376 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 377 { 378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 380 381 /* 382 * broadcast/multicast frame 383 * 384 * If any of the associated stations is in power save mode, 385 * the frame is buffered to be sent after DTIM beacon frame. 386 * This is done either by the hardware or us. 387 */ 388 389 /* powersaving STAs only in AP/VLAN mode */ 390 if (!tx->sdata->bss) 391 return TX_CONTINUE; 392 393 /* no buffering for ordered frames */ 394 if (ieee80211_has_order(hdr->frame_control)) 395 return TX_CONTINUE; 396 397 /* no stations in PS mode */ 398 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 399 return TX_CONTINUE; 400 401 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 402 403 /* device releases frame after DTIM beacon */ 404 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 405 return TX_CONTINUE; 406 407 /* buffered in mac80211 */ 408 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 409 purge_old_ps_buffers(tx->local); 410 411 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 412 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 413 if (net_ratelimit()) 414 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", 415 tx->sdata->name); 416 #endif 417 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 418 } else 419 tx->local->total_ps_buffered++; 420 421 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 422 423 return TX_QUEUED; 424 } 425 426 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 427 struct sk_buff *skb) 428 { 429 if (!ieee80211_is_mgmt(fc)) 430 return 0; 431 432 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 433 return 0; 434 435 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 436 skb->data)) 437 return 0; 438 439 return 1; 440 } 441 442 static ieee80211_tx_result 443 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 444 { 445 struct sta_info *sta = tx->sta; 446 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 447 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 448 struct ieee80211_local *local = tx->local; 449 450 if (unlikely(!sta || 451 ieee80211_is_probe_resp(hdr->frame_control) || 452 ieee80211_is_auth(hdr->frame_control) || 453 ieee80211_is_assoc_resp(hdr->frame_control) || 454 ieee80211_is_reassoc_resp(hdr->frame_control))) 455 return TX_CONTINUE; 456 457 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 458 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 459 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) { 460 int ac = skb_get_queue_mapping(tx->skb); 461 462 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 463 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n", 464 sta->sta.addr, sta->sta.aid, ac); 465 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 466 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 467 purge_old_ps_buffers(tx->local); 468 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 469 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 470 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 471 if (net_ratelimit()) 472 printk(KERN_DEBUG "%s: STA %pM TX buffer for " 473 "AC %d full - dropping oldest frame\n", 474 tx->sdata->name, sta->sta.addr, ac); 475 #endif 476 dev_kfree_skb(old); 477 } else 478 tx->local->total_ps_buffered++; 479 480 info->control.jiffies = jiffies; 481 info->control.vif = &tx->sdata->vif; 482 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 483 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 484 485 if (!timer_pending(&local->sta_cleanup)) 486 mod_timer(&local->sta_cleanup, 487 round_jiffies(jiffies + 488 STA_INFO_CLEANUP_INTERVAL)); 489 490 /* 491 * We queued up some frames, so the TIM bit might 492 * need to be set, recalculate it. 493 */ 494 sta_info_recalc_tim(sta); 495 496 return TX_QUEUED; 497 } 498 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 499 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 500 printk(KERN_DEBUG 501 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n", 502 tx->sdata->name, sta->sta.addr); 503 } 504 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 505 506 return TX_CONTINUE; 507 } 508 509 static ieee80211_tx_result debug_noinline 510 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 511 { 512 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 513 return TX_CONTINUE; 514 515 if (tx->flags & IEEE80211_TX_UNICAST) 516 return ieee80211_tx_h_unicast_ps_buf(tx); 517 else 518 return ieee80211_tx_h_multicast_ps_buf(tx); 519 } 520 521 static ieee80211_tx_result debug_noinline 522 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 523 { 524 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 525 526 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 527 tx->sdata->control_port_no_encrypt)) 528 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 529 530 return TX_CONTINUE; 531 } 532 533 static ieee80211_tx_result debug_noinline 534 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 535 { 536 struct ieee80211_key *key = NULL; 537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 539 540 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 541 tx->key = NULL; 542 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 543 tx->key = key; 544 else if (ieee80211_is_mgmt(hdr->frame_control) && 545 is_multicast_ether_addr(hdr->addr1) && 546 ieee80211_is_robust_mgmt_frame(hdr) && 547 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 548 tx->key = key; 549 else if (is_multicast_ether_addr(hdr->addr1) && 550 (key = rcu_dereference(tx->sdata->default_multicast_key))) 551 tx->key = key; 552 else if (!is_multicast_ether_addr(hdr->addr1) && 553 (key = rcu_dereference(tx->sdata->default_unicast_key))) 554 tx->key = key; 555 else if (tx->sdata->drop_unencrypted && 556 (tx->skb->protocol != tx->sdata->control_port_protocol) && 557 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 558 (!ieee80211_is_robust_mgmt_frame(hdr) || 559 (ieee80211_is_action(hdr->frame_control) && 560 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) { 561 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 562 return TX_DROP; 563 } else 564 tx->key = NULL; 565 566 if (tx->key) { 567 bool skip_hw = false; 568 569 tx->key->tx_rx_count++; 570 /* TODO: add threshold stuff again */ 571 572 switch (tx->key->conf.cipher) { 573 case WLAN_CIPHER_SUITE_WEP40: 574 case WLAN_CIPHER_SUITE_WEP104: 575 if (ieee80211_is_auth(hdr->frame_control)) 576 break; 577 case WLAN_CIPHER_SUITE_TKIP: 578 if (!ieee80211_is_data_present(hdr->frame_control)) 579 tx->key = NULL; 580 break; 581 case WLAN_CIPHER_SUITE_CCMP: 582 if (!ieee80211_is_data_present(hdr->frame_control) && 583 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 584 tx->skb)) 585 tx->key = NULL; 586 else 587 skip_hw = (tx->key->conf.flags & 588 IEEE80211_KEY_FLAG_SW_MGMT) && 589 ieee80211_is_mgmt(hdr->frame_control); 590 break; 591 case WLAN_CIPHER_SUITE_AES_CMAC: 592 if (!ieee80211_is_mgmt(hdr->frame_control)) 593 tx->key = NULL; 594 break; 595 } 596 597 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 598 return TX_DROP; 599 600 if (!skip_hw && tx->key && 601 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 602 info->control.hw_key = &tx->key->conf; 603 } 604 605 return TX_CONTINUE; 606 } 607 608 static ieee80211_tx_result debug_noinline 609 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 610 { 611 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 612 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 613 struct ieee80211_supported_band *sband; 614 struct ieee80211_rate *rate; 615 int i; 616 u32 len; 617 bool inval = false, rts = false, short_preamble = false; 618 struct ieee80211_tx_rate_control txrc; 619 bool assoc = false; 620 621 memset(&txrc, 0, sizeof(txrc)); 622 623 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 624 625 len = min_t(u32, tx->skb->len + FCS_LEN, 626 tx->local->hw.wiphy->frag_threshold); 627 628 /* set up the tx rate control struct we give the RC algo */ 629 txrc.hw = local_to_hw(tx->local); 630 txrc.sband = sband; 631 txrc.bss_conf = &tx->sdata->vif.bss_conf; 632 txrc.skb = tx->skb; 633 txrc.reported_rate.idx = -1; 634 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 635 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 636 txrc.max_rate_idx = -1; 637 else 638 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 639 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 640 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 641 642 /* set up RTS protection if desired */ 643 if (len > tx->local->hw.wiphy->rts_threshold) { 644 txrc.rts = rts = true; 645 } 646 647 /* 648 * Use short preamble if the BSS can handle it, but not for 649 * management frames unless we know the receiver can handle 650 * that -- the management frame might be to a station that 651 * just wants a probe response. 652 */ 653 if (tx->sdata->vif.bss_conf.use_short_preamble && 654 (ieee80211_is_data(hdr->frame_control) || 655 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 656 txrc.short_preamble = short_preamble = true; 657 658 if (tx->sta) 659 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 660 661 /* 662 * Lets not bother rate control if we're associated and cannot 663 * talk to the sta. This should not happen. 664 */ 665 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 666 !rate_usable_index_exists(sband, &tx->sta->sta), 667 "%s: Dropped data frame as no usable bitrate found while " 668 "scanning and associated. Target station: " 669 "%pM on %d GHz band\n", 670 tx->sdata->name, hdr->addr1, 671 tx->channel->band ? 5 : 2)) 672 return TX_DROP; 673 674 /* 675 * If we're associated with the sta at this point we know we can at 676 * least send the frame at the lowest bit rate. 677 */ 678 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 679 680 if (unlikely(info->control.rates[0].idx < 0)) 681 return TX_DROP; 682 683 if (txrc.reported_rate.idx < 0) { 684 txrc.reported_rate = info->control.rates[0]; 685 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 686 tx->sta->last_tx_rate = txrc.reported_rate; 687 } else if (tx->sta) 688 tx->sta->last_tx_rate = txrc.reported_rate; 689 690 if (unlikely(!info->control.rates[0].count)) 691 info->control.rates[0].count = 1; 692 693 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 694 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 695 info->control.rates[0].count = 1; 696 697 if (is_multicast_ether_addr(hdr->addr1)) { 698 /* 699 * XXX: verify the rate is in the basic rateset 700 */ 701 return TX_CONTINUE; 702 } 703 704 /* 705 * set up the RTS/CTS rate as the fastest basic rate 706 * that is not faster than the data rate 707 * 708 * XXX: Should this check all retry rates? 709 */ 710 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 711 s8 baserate = 0; 712 713 rate = &sband->bitrates[info->control.rates[0].idx]; 714 715 for (i = 0; i < sband->n_bitrates; i++) { 716 /* must be a basic rate */ 717 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 718 continue; 719 /* must not be faster than the data rate */ 720 if (sband->bitrates[i].bitrate > rate->bitrate) 721 continue; 722 /* maximum */ 723 if (sband->bitrates[baserate].bitrate < 724 sband->bitrates[i].bitrate) 725 baserate = i; 726 } 727 728 info->control.rts_cts_rate_idx = baserate; 729 } 730 731 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 732 /* 733 * make sure there's no valid rate following 734 * an invalid one, just in case drivers don't 735 * take the API seriously to stop at -1. 736 */ 737 if (inval) { 738 info->control.rates[i].idx = -1; 739 continue; 740 } 741 if (info->control.rates[i].idx < 0) { 742 inval = true; 743 continue; 744 } 745 746 /* 747 * For now assume MCS is already set up correctly, this 748 * needs to be fixed. 749 */ 750 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 751 WARN_ON(info->control.rates[i].idx > 76); 752 continue; 753 } 754 755 /* set up RTS protection if desired */ 756 if (rts) 757 info->control.rates[i].flags |= 758 IEEE80211_TX_RC_USE_RTS_CTS; 759 760 /* RC is busted */ 761 if (WARN_ON_ONCE(info->control.rates[i].idx >= 762 sband->n_bitrates)) { 763 info->control.rates[i].idx = -1; 764 continue; 765 } 766 767 rate = &sband->bitrates[info->control.rates[i].idx]; 768 769 /* set up short preamble */ 770 if (short_preamble && 771 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 772 info->control.rates[i].flags |= 773 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 774 775 /* set up G protection */ 776 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 777 rate->flags & IEEE80211_RATE_ERP_G) 778 info->control.rates[i].flags |= 779 IEEE80211_TX_RC_USE_CTS_PROTECT; 780 } 781 782 return TX_CONTINUE; 783 } 784 785 static ieee80211_tx_result debug_noinline 786 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 787 { 788 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 790 u16 *seq; 791 u8 *qc; 792 int tid; 793 794 /* 795 * Packet injection may want to control the sequence 796 * number, if we have no matching interface then we 797 * neither assign one ourselves nor ask the driver to. 798 */ 799 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 800 return TX_CONTINUE; 801 802 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 803 return TX_CONTINUE; 804 805 if (ieee80211_hdrlen(hdr->frame_control) < 24) 806 return TX_CONTINUE; 807 808 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 809 return TX_CONTINUE; 810 811 /* 812 * Anything but QoS data that has a sequence number field 813 * (is long enough) gets a sequence number from the global 814 * counter. 815 */ 816 if (!ieee80211_is_data_qos(hdr->frame_control)) { 817 /* driver should assign sequence number */ 818 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 819 /* for pure STA mode without beacons, we can do it */ 820 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 821 tx->sdata->sequence_number += 0x10; 822 return TX_CONTINUE; 823 } 824 825 /* 826 * This should be true for injected/management frames only, for 827 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 828 * above since they are not QoS-data frames. 829 */ 830 if (!tx->sta) 831 return TX_CONTINUE; 832 833 /* include per-STA, per-TID sequence counter */ 834 835 qc = ieee80211_get_qos_ctl(hdr); 836 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 837 seq = &tx->sta->tid_seq[tid]; 838 839 hdr->seq_ctrl = cpu_to_le16(*seq); 840 841 /* Increase the sequence number. */ 842 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 843 844 return TX_CONTINUE; 845 } 846 847 static int ieee80211_fragment(struct ieee80211_local *local, 848 struct sk_buff *skb, int hdrlen, 849 int frag_threshold) 850 { 851 struct sk_buff *tail = skb, *tmp; 852 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 853 int pos = hdrlen + per_fragm; 854 int rem = skb->len - hdrlen - per_fragm; 855 856 if (WARN_ON(rem < 0)) 857 return -EINVAL; 858 859 while (rem) { 860 int fraglen = per_fragm; 861 862 if (fraglen > rem) 863 fraglen = rem; 864 rem -= fraglen; 865 tmp = dev_alloc_skb(local->tx_headroom + 866 frag_threshold + 867 IEEE80211_ENCRYPT_HEADROOM + 868 IEEE80211_ENCRYPT_TAILROOM); 869 if (!tmp) 870 return -ENOMEM; 871 tail->next = tmp; 872 tail = tmp; 873 skb_reserve(tmp, local->tx_headroom + 874 IEEE80211_ENCRYPT_HEADROOM); 875 /* copy control information */ 876 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 877 skb_copy_queue_mapping(tmp, skb); 878 tmp->priority = skb->priority; 879 tmp->dev = skb->dev; 880 881 /* copy header and data */ 882 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 883 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 884 885 pos += fraglen; 886 } 887 888 skb->len = hdrlen + per_fragm; 889 return 0; 890 } 891 892 static ieee80211_tx_result debug_noinline 893 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 894 { 895 struct sk_buff *skb = tx->skb; 896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 897 struct ieee80211_hdr *hdr = (void *)skb->data; 898 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 899 int hdrlen; 900 int fragnum; 901 902 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 903 return TX_CONTINUE; 904 905 if (tx->local->ops->set_frag_threshold) 906 return TX_CONTINUE; 907 908 /* 909 * Warn when submitting a fragmented A-MPDU frame and drop it. 910 * This scenario is handled in ieee80211_tx_prepare but extra 911 * caution taken here as fragmented ampdu may cause Tx stop. 912 */ 913 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 914 return TX_DROP; 915 916 hdrlen = ieee80211_hdrlen(hdr->frame_control); 917 918 /* internal error, why isn't DONTFRAG set? */ 919 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 920 return TX_DROP; 921 922 /* 923 * Now fragment the frame. This will allocate all the fragments and 924 * chain them (using skb as the first fragment) to skb->next. 925 * During transmission, we will remove the successfully transmitted 926 * fragments from this list. When the low-level driver rejects one 927 * of the fragments then we will simply pretend to accept the skb 928 * but store it away as pending. 929 */ 930 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold)) 931 return TX_DROP; 932 933 /* update duration/seq/flags of fragments */ 934 fragnum = 0; 935 do { 936 int next_len; 937 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 938 939 hdr = (void *)skb->data; 940 info = IEEE80211_SKB_CB(skb); 941 942 if (skb->next) { 943 hdr->frame_control |= morefrags; 944 next_len = skb->next->len; 945 /* 946 * No multi-rate retries for fragmented frames, that 947 * would completely throw off the NAV at other STAs. 948 */ 949 info->control.rates[1].idx = -1; 950 info->control.rates[2].idx = -1; 951 info->control.rates[3].idx = -1; 952 info->control.rates[4].idx = -1; 953 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 954 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 955 } else { 956 hdr->frame_control &= ~morefrags; 957 next_len = 0; 958 } 959 hdr->duration_id = ieee80211_duration(tx, 0, next_len); 960 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 961 fragnum++; 962 } while ((skb = skb->next)); 963 964 return TX_CONTINUE; 965 } 966 967 static ieee80211_tx_result debug_noinline 968 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 969 { 970 struct sk_buff *skb = tx->skb; 971 972 if (!tx->sta) 973 return TX_CONTINUE; 974 975 tx->sta->tx_packets++; 976 do { 977 tx->sta->tx_fragments++; 978 tx->sta->tx_bytes += skb->len; 979 } while ((skb = skb->next)); 980 981 return TX_CONTINUE; 982 } 983 984 static ieee80211_tx_result debug_noinline 985 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 986 { 987 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 988 989 if (!tx->key) 990 return TX_CONTINUE; 991 992 switch (tx->key->conf.cipher) { 993 case WLAN_CIPHER_SUITE_WEP40: 994 case WLAN_CIPHER_SUITE_WEP104: 995 return ieee80211_crypto_wep_encrypt(tx); 996 case WLAN_CIPHER_SUITE_TKIP: 997 return ieee80211_crypto_tkip_encrypt(tx); 998 case WLAN_CIPHER_SUITE_CCMP: 999 return ieee80211_crypto_ccmp_encrypt(tx); 1000 case WLAN_CIPHER_SUITE_AES_CMAC: 1001 return ieee80211_crypto_aes_cmac_encrypt(tx); 1002 default: 1003 /* handle hw-only algorithm */ 1004 if (info->control.hw_key) { 1005 ieee80211_tx_set_protected(tx); 1006 return TX_CONTINUE; 1007 } 1008 break; 1009 1010 } 1011 1012 return TX_DROP; 1013 } 1014 1015 static ieee80211_tx_result debug_noinline 1016 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1017 { 1018 struct sk_buff *skb = tx->skb; 1019 struct ieee80211_hdr *hdr; 1020 int next_len; 1021 bool group_addr; 1022 1023 do { 1024 hdr = (void *) skb->data; 1025 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1026 break; /* must not overwrite AID */ 1027 next_len = skb->next ? skb->next->len : 0; 1028 group_addr = is_multicast_ether_addr(hdr->addr1); 1029 1030 hdr->duration_id = 1031 ieee80211_duration(tx, group_addr, next_len); 1032 } while ((skb = skb->next)); 1033 1034 return TX_CONTINUE; 1035 } 1036 1037 /* actual transmit path */ 1038 1039 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1040 struct sk_buff *skb, 1041 struct ieee80211_tx_info *info, 1042 struct tid_ampdu_tx *tid_tx, 1043 int tid) 1044 { 1045 bool queued = false; 1046 1047 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1048 info->flags |= IEEE80211_TX_CTL_AMPDU; 1049 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1050 /* 1051 * nothing -- this aggregation session is being started 1052 * but that might still fail with the driver 1053 */ 1054 } else { 1055 spin_lock(&tx->sta->lock); 1056 /* 1057 * Need to re-check now, because we may get here 1058 * 1059 * 1) in the window during which the setup is actually 1060 * already done, but not marked yet because not all 1061 * packets are spliced over to the driver pending 1062 * queue yet -- if this happened we acquire the lock 1063 * either before or after the splice happens, but 1064 * need to recheck which of these cases happened. 1065 * 1066 * 2) during session teardown, if the OPERATIONAL bit 1067 * was cleared due to the teardown but the pointer 1068 * hasn't been assigned NULL yet (or we loaded it 1069 * before it was assigned) -- in this case it may 1070 * now be NULL which means we should just let the 1071 * packet pass through because splicing the frames 1072 * back is already done. 1073 */ 1074 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1075 1076 if (!tid_tx) { 1077 /* do nothing, let packet pass through */ 1078 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1079 info->flags |= IEEE80211_TX_CTL_AMPDU; 1080 } else { 1081 queued = true; 1082 info->control.vif = &tx->sdata->vif; 1083 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1084 __skb_queue_tail(&tid_tx->pending, skb); 1085 } 1086 spin_unlock(&tx->sta->lock); 1087 } 1088 1089 return queued; 1090 } 1091 1092 /* 1093 * initialises @tx 1094 */ 1095 static ieee80211_tx_result 1096 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1097 struct ieee80211_tx_data *tx, 1098 struct sk_buff *skb) 1099 { 1100 struct ieee80211_local *local = sdata->local; 1101 struct ieee80211_hdr *hdr; 1102 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1103 int tid; 1104 u8 *qc; 1105 1106 memset(tx, 0, sizeof(*tx)); 1107 tx->skb = skb; 1108 tx->local = local; 1109 tx->sdata = sdata; 1110 tx->channel = local->hw.conf.channel; 1111 1112 /* 1113 * If this flag is set to true anywhere, and we get here, 1114 * we are doing the needed processing, so remove the flag 1115 * now. 1116 */ 1117 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1118 1119 hdr = (struct ieee80211_hdr *) skb->data; 1120 1121 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1122 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1123 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1124 return TX_DROP; 1125 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1126 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1127 } 1128 if (!tx->sta) 1129 tx->sta = sta_info_get(sdata, hdr->addr1); 1130 1131 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1132 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1133 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1134 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1135 struct tid_ampdu_tx *tid_tx; 1136 1137 qc = ieee80211_get_qos_ctl(hdr); 1138 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1139 1140 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1141 if (tid_tx) { 1142 bool queued; 1143 1144 queued = ieee80211_tx_prep_agg(tx, skb, info, 1145 tid_tx, tid); 1146 1147 if (unlikely(queued)) 1148 return TX_QUEUED; 1149 } 1150 } 1151 1152 if (is_multicast_ether_addr(hdr->addr1)) { 1153 tx->flags &= ~IEEE80211_TX_UNICAST; 1154 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1155 } else { 1156 tx->flags |= IEEE80211_TX_UNICAST; 1157 if (unlikely(local->wifi_wme_noack_test)) 1158 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1159 /* 1160 * Flags are initialized to 0. Hence, no need to 1161 * explicitly unset IEEE80211_TX_CTL_NO_ACK since 1162 * it might already be set for injected frames. 1163 */ 1164 } 1165 1166 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1167 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1168 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1169 info->flags & IEEE80211_TX_CTL_AMPDU) 1170 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1171 } 1172 1173 if (!tx->sta) 1174 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1175 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1176 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1177 1178 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1179 1180 return TX_CONTINUE; 1181 } 1182 1183 /* 1184 * Returns false if the frame couldn't be transmitted but was queued instead. 1185 */ 1186 static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp, 1187 struct sta_info *sta, bool txpending) 1188 { 1189 struct sk_buff *skb = *skbp, *next; 1190 struct ieee80211_tx_info *info; 1191 struct ieee80211_sub_if_data *sdata; 1192 unsigned long flags; 1193 int len; 1194 bool fragm = false; 1195 1196 while (skb) { 1197 int q = skb_get_queue_mapping(skb); 1198 __le16 fc; 1199 1200 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1201 if (local->queue_stop_reasons[q] || 1202 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1203 /* 1204 * Since queue is stopped, queue up frames for later 1205 * transmission from the tx-pending tasklet when the 1206 * queue is woken again. 1207 */ 1208 1209 do { 1210 next = skb->next; 1211 skb->next = NULL; 1212 /* 1213 * NB: If txpending is true, next must already 1214 * be NULL since we must've gone through this 1215 * loop before already; therefore we can just 1216 * queue the frame to the head without worrying 1217 * about reordering of fragments. 1218 */ 1219 if (unlikely(txpending)) 1220 __skb_queue_head(&local->pending[q], 1221 skb); 1222 else 1223 __skb_queue_tail(&local->pending[q], 1224 skb); 1225 } while ((skb = next)); 1226 1227 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1228 flags); 1229 return false; 1230 } 1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1232 1233 info = IEEE80211_SKB_CB(skb); 1234 1235 if (fragm) 1236 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 1237 IEEE80211_TX_CTL_FIRST_FRAGMENT); 1238 1239 next = skb->next; 1240 len = skb->len; 1241 1242 if (next) 1243 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 1244 1245 sdata = vif_to_sdata(info->control.vif); 1246 1247 switch (sdata->vif.type) { 1248 case NL80211_IFTYPE_MONITOR: 1249 info->control.vif = NULL; 1250 break; 1251 case NL80211_IFTYPE_AP_VLAN: 1252 info->control.vif = &container_of(sdata->bss, 1253 struct ieee80211_sub_if_data, u.ap)->vif; 1254 break; 1255 default: 1256 /* keep */ 1257 break; 1258 } 1259 1260 if (sta && sta->uploaded) 1261 info->control.sta = &sta->sta; 1262 else 1263 info->control.sta = NULL; 1264 1265 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1266 drv_tx(local, skb); 1267 1268 ieee80211_tpt_led_trig_tx(local, fc, len); 1269 *skbp = skb = next; 1270 ieee80211_led_tx(local, 1); 1271 fragm = true; 1272 } 1273 1274 return true; 1275 } 1276 1277 /* 1278 * Invoke TX handlers, return 0 on success and non-zero if the 1279 * frame was dropped or queued. 1280 */ 1281 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1282 { 1283 struct sk_buff *skb = tx->skb; 1284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1285 ieee80211_tx_result res = TX_DROP; 1286 1287 #define CALL_TXH(txh) \ 1288 do { \ 1289 res = txh(tx); \ 1290 if (res != TX_CONTINUE) \ 1291 goto txh_done; \ 1292 } while (0) 1293 1294 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1295 CALL_TXH(ieee80211_tx_h_check_assoc); 1296 CALL_TXH(ieee80211_tx_h_ps_buf); 1297 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1298 CALL_TXH(ieee80211_tx_h_select_key); 1299 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1300 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1301 1302 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) 1303 goto txh_done; 1304 1305 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1306 CALL_TXH(ieee80211_tx_h_sequence); 1307 CALL_TXH(ieee80211_tx_h_fragment); 1308 /* handlers after fragment must be aware of tx info fragmentation! */ 1309 CALL_TXH(ieee80211_tx_h_stats); 1310 CALL_TXH(ieee80211_tx_h_encrypt); 1311 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1312 CALL_TXH(ieee80211_tx_h_calculate_duration); 1313 #undef CALL_TXH 1314 1315 txh_done: 1316 if (unlikely(res == TX_DROP)) { 1317 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1318 while (skb) { 1319 struct sk_buff *next; 1320 1321 next = skb->next; 1322 dev_kfree_skb(skb); 1323 skb = next; 1324 } 1325 return -1; 1326 } else if (unlikely(res == TX_QUEUED)) { 1327 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1328 return -1; 1329 } 1330 1331 return 0; 1332 } 1333 1334 /* 1335 * Returns false if the frame couldn't be transmitted but was queued instead. 1336 */ 1337 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1338 struct sk_buff *skb, bool txpending) 1339 { 1340 struct ieee80211_local *local = sdata->local; 1341 struct ieee80211_tx_data tx; 1342 ieee80211_tx_result res_prepare; 1343 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1344 bool result = true; 1345 1346 if (unlikely(skb->len < 10)) { 1347 dev_kfree_skb(skb); 1348 return true; 1349 } 1350 1351 rcu_read_lock(); 1352 1353 /* initialises tx */ 1354 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1355 1356 if (unlikely(res_prepare == TX_DROP)) { 1357 dev_kfree_skb(skb); 1358 goto out; 1359 } else if (unlikely(res_prepare == TX_QUEUED)) { 1360 goto out; 1361 } 1362 1363 tx.channel = local->hw.conf.channel; 1364 info->band = tx.channel->band; 1365 1366 if (!invoke_tx_handlers(&tx)) 1367 result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); 1368 out: 1369 rcu_read_unlock(); 1370 return result; 1371 } 1372 1373 /* device xmit handlers */ 1374 1375 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1376 struct sk_buff *skb, 1377 int head_need, bool may_encrypt) 1378 { 1379 struct ieee80211_local *local = sdata->local; 1380 int tail_need = 0; 1381 1382 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1383 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1384 tail_need -= skb_tailroom(skb); 1385 tail_need = max_t(int, tail_need, 0); 1386 } 1387 1388 if (skb_cloned(skb)) 1389 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1390 else if (head_need || tail_need) 1391 I802_DEBUG_INC(local->tx_expand_skb_head); 1392 else 1393 return 0; 1394 1395 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1396 wiphy_debug(local->hw.wiphy, 1397 "failed to reallocate TX buffer\n"); 1398 return -ENOMEM; 1399 } 1400 1401 return 0; 1402 } 1403 1404 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1405 { 1406 struct ieee80211_local *local = sdata->local; 1407 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1408 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1409 int headroom; 1410 bool may_encrypt; 1411 1412 rcu_read_lock(); 1413 1414 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1415 1416 headroom = local->tx_headroom; 1417 if (may_encrypt) 1418 headroom += IEEE80211_ENCRYPT_HEADROOM; 1419 headroom -= skb_headroom(skb); 1420 headroom = max_t(int, 0, headroom); 1421 1422 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1423 dev_kfree_skb(skb); 1424 rcu_read_unlock(); 1425 return; 1426 } 1427 1428 hdr = (struct ieee80211_hdr *) skb->data; 1429 info->control.vif = &sdata->vif; 1430 1431 if (ieee80211_vif_is_mesh(&sdata->vif) && 1432 ieee80211_is_data(hdr->frame_control) && 1433 !is_multicast_ether_addr(hdr->addr1)) 1434 if (mesh_nexthop_lookup(skb, sdata)) { 1435 /* skb queued: don't free */ 1436 rcu_read_unlock(); 1437 return; 1438 } 1439 1440 ieee80211_set_qos_hdr(sdata, skb); 1441 ieee80211_tx(sdata, skb, false); 1442 rcu_read_unlock(); 1443 } 1444 1445 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1446 { 1447 struct ieee80211_radiotap_iterator iterator; 1448 struct ieee80211_radiotap_header *rthdr = 1449 (struct ieee80211_radiotap_header *) skb->data; 1450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1451 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1452 NULL); 1453 u16 txflags; 1454 1455 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1456 IEEE80211_TX_CTL_DONTFRAG; 1457 1458 /* 1459 * for every radiotap entry that is present 1460 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1461 * entries present, or -EINVAL on error) 1462 */ 1463 1464 while (!ret) { 1465 ret = ieee80211_radiotap_iterator_next(&iterator); 1466 1467 if (ret) 1468 continue; 1469 1470 /* see if this argument is something we can use */ 1471 switch (iterator.this_arg_index) { 1472 /* 1473 * You must take care when dereferencing iterator.this_arg 1474 * for multibyte types... the pointer is not aligned. Use 1475 * get_unaligned((type *)iterator.this_arg) to dereference 1476 * iterator.this_arg for type "type" safely on all arches. 1477 */ 1478 case IEEE80211_RADIOTAP_FLAGS: 1479 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1480 /* 1481 * this indicates that the skb we have been 1482 * handed has the 32-bit FCS CRC at the end... 1483 * we should react to that by snipping it off 1484 * because it will be recomputed and added 1485 * on transmission 1486 */ 1487 if (skb->len < (iterator._max_length + FCS_LEN)) 1488 return false; 1489 1490 skb_trim(skb, skb->len - FCS_LEN); 1491 } 1492 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1493 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1494 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1495 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1496 break; 1497 1498 case IEEE80211_RADIOTAP_TX_FLAGS: 1499 txflags = get_unaligned_le16(iterator.this_arg); 1500 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1501 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1502 break; 1503 1504 /* 1505 * Please update the file 1506 * Documentation/networking/mac80211-injection.txt 1507 * when parsing new fields here. 1508 */ 1509 1510 default: 1511 break; 1512 } 1513 } 1514 1515 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1516 return false; 1517 1518 /* 1519 * remove the radiotap header 1520 * iterator->_max_length was sanity-checked against 1521 * skb->len by iterator init 1522 */ 1523 skb_pull(skb, iterator._max_length); 1524 1525 return true; 1526 } 1527 1528 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1529 struct net_device *dev) 1530 { 1531 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1532 struct ieee80211_channel *chan = local->hw.conf.channel; 1533 struct ieee80211_radiotap_header *prthdr = 1534 (struct ieee80211_radiotap_header *)skb->data; 1535 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1536 struct ieee80211_hdr *hdr; 1537 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1538 u16 len_rthdr; 1539 int hdrlen; 1540 1541 /* 1542 * Frame injection is not allowed if beaconing is not allowed 1543 * or if we need radar detection. Beaconing is usually not allowed when 1544 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1545 * Passive scan is also used in world regulatory domains where 1546 * your country is not known and as such it should be treated as 1547 * NO TX unless the channel is explicitly allowed in which case 1548 * your current regulatory domain would not have the passive scan 1549 * flag. 1550 * 1551 * Since AP mode uses monitor interfaces to inject/TX management 1552 * frames we can make AP mode the exception to this rule once it 1553 * supports radar detection as its implementation can deal with 1554 * radar detection by itself. We can do that later by adding a 1555 * monitor flag interfaces used for AP support. 1556 */ 1557 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1558 IEEE80211_CHAN_PASSIVE_SCAN))) 1559 goto fail; 1560 1561 /* check for not even having the fixed radiotap header part */ 1562 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1563 goto fail; /* too short to be possibly valid */ 1564 1565 /* is it a header version we can trust to find length from? */ 1566 if (unlikely(prthdr->it_version)) 1567 goto fail; /* only version 0 is supported */ 1568 1569 /* then there must be a radiotap header with a length we can use */ 1570 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1571 1572 /* does the skb contain enough to deliver on the alleged length? */ 1573 if (unlikely(skb->len < len_rthdr)) 1574 goto fail; /* skb too short for claimed rt header extent */ 1575 1576 /* 1577 * fix up the pointers accounting for the radiotap 1578 * header still being in there. We are being given 1579 * a precooked IEEE80211 header so no need for 1580 * normal processing 1581 */ 1582 skb_set_mac_header(skb, len_rthdr); 1583 /* 1584 * these are just fixed to the end of the rt area since we 1585 * don't have any better information and at this point, nobody cares 1586 */ 1587 skb_set_network_header(skb, len_rthdr); 1588 skb_set_transport_header(skb, len_rthdr); 1589 1590 if (skb->len < len_rthdr + 2) 1591 goto fail; 1592 1593 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1594 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1595 1596 if (skb->len < len_rthdr + hdrlen) 1597 goto fail; 1598 1599 /* 1600 * Initialize skb->protocol if the injected frame is a data frame 1601 * carrying a rfc1042 header 1602 */ 1603 if (ieee80211_is_data(hdr->frame_control) && 1604 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1605 u8 *payload = (u8 *)hdr + hdrlen; 1606 1607 if (compare_ether_addr(payload, rfc1042_header) == 0) 1608 skb->protocol = cpu_to_be16((payload[6] << 8) | 1609 payload[7]); 1610 } 1611 1612 memset(info, 0, sizeof(*info)); 1613 1614 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1615 IEEE80211_TX_CTL_INJECTED; 1616 1617 /* process and remove the injection radiotap header */ 1618 if (!ieee80211_parse_tx_radiotap(skb)) 1619 goto fail; 1620 1621 rcu_read_lock(); 1622 1623 /* 1624 * We process outgoing injected frames that have a local address 1625 * we handle as though they are non-injected frames. 1626 * This code here isn't entirely correct, the local MAC address 1627 * isn't always enough to find the interface to use; for proper 1628 * VLAN/WDS support we will need a different mechanism (which 1629 * likely isn't going to be monitor interfaces). 1630 */ 1631 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1632 1633 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1634 if (!ieee80211_sdata_running(tmp_sdata)) 1635 continue; 1636 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1637 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1638 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1639 continue; 1640 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { 1641 sdata = tmp_sdata; 1642 break; 1643 } 1644 } 1645 1646 ieee80211_xmit(sdata, skb); 1647 rcu_read_unlock(); 1648 1649 return NETDEV_TX_OK; 1650 1651 fail: 1652 dev_kfree_skb(skb); 1653 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1654 } 1655 1656 /** 1657 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1658 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1659 * @skb: packet to be sent 1660 * @dev: incoming interface 1661 * 1662 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1663 * not be freed, and caller is responsible for either retrying later or freeing 1664 * skb). 1665 * 1666 * This function takes in an Ethernet header and encapsulates it with suitable 1667 * IEEE 802.11 header based on which interface the packet is coming in. The 1668 * encapsulated packet will then be passed to master interface, wlan#.11, for 1669 * transmission (through low-level driver). 1670 */ 1671 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1672 struct net_device *dev) 1673 { 1674 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1675 struct ieee80211_local *local = sdata->local; 1676 struct ieee80211_tx_info *info; 1677 int ret = NETDEV_TX_BUSY, head_need; 1678 u16 ethertype, hdrlen, meshhdrlen = 0; 1679 __le16 fc; 1680 struct ieee80211_hdr hdr; 1681 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1682 struct mesh_path __maybe_unused *mppath = NULL; 1683 const u8 *encaps_data; 1684 int encaps_len, skip_header_bytes; 1685 int nh_pos, h_pos; 1686 struct sta_info *sta = NULL; 1687 bool wme_sta = false, authorized = false, tdls_auth = false; 1688 struct sk_buff *tmp_skb; 1689 bool tdls_direct = false; 1690 1691 if (unlikely(skb->len < ETH_HLEN)) { 1692 ret = NETDEV_TX_OK; 1693 goto fail; 1694 } 1695 1696 /* convert Ethernet header to proper 802.11 header (based on 1697 * operation mode) */ 1698 ethertype = (skb->data[12] << 8) | skb->data[13]; 1699 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1700 1701 switch (sdata->vif.type) { 1702 case NL80211_IFTYPE_AP_VLAN: 1703 rcu_read_lock(); 1704 sta = rcu_dereference(sdata->u.vlan.sta); 1705 if (sta) { 1706 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1707 /* RA TA DA SA */ 1708 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1709 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1710 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1711 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1712 hdrlen = 30; 1713 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1714 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1715 } 1716 rcu_read_unlock(); 1717 if (sta) 1718 break; 1719 /* fall through */ 1720 case NL80211_IFTYPE_AP: 1721 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1722 /* DA BSSID SA */ 1723 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1724 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1725 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1726 hdrlen = 24; 1727 break; 1728 case NL80211_IFTYPE_WDS: 1729 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1730 /* RA TA DA SA */ 1731 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1732 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1733 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1734 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1735 hdrlen = 30; 1736 break; 1737 #ifdef CONFIG_MAC80211_MESH 1738 case NL80211_IFTYPE_MESH_POINT: 1739 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1740 /* Do not send frames with mesh_ttl == 0 */ 1741 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1742 ret = NETDEV_TX_OK; 1743 goto fail; 1744 } 1745 rcu_read_lock(); 1746 if (!is_multicast_ether_addr(skb->data)) 1747 mppath = mpp_path_lookup(skb->data, sdata); 1748 1749 /* 1750 * Use address extension if it is a packet from 1751 * another interface or if we know the destination 1752 * is being proxied by a portal (i.e. portal address 1753 * differs from proxied address) 1754 */ 1755 if (compare_ether_addr(sdata->vif.addr, 1756 skb->data + ETH_ALEN) == 0 && 1757 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { 1758 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1759 skb->data, skb->data + ETH_ALEN); 1760 rcu_read_unlock(); 1761 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1762 sdata, NULL, NULL); 1763 } else { 1764 int is_mesh_mcast = 1; 1765 const u8 *mesh_da; 1766 1767 if (is_multicast_ether_addr(skb->data)) 1768 /* DA TA mSA AE:SA */ 1769 mesh_da = skb->data; 1770 else { 1771 static const u8 bcast[ETH_ALEN] = 1772 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1773 if (mppath) { 1774 /* RA TA mDA mSA AE:DA SA */ 1775 mesh_da = mppath->mpp; 1776 is_mesh_mcast = 0; 1777 } else { 1778 /* DA TA mSA AE:SA */ 1779 mesh_da = bcast; 1780 } 1781 } 1782 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1783 mesh_da, sdata->vif.addr); 1784 rcu_read_unlock(); 1785 if (is_mesh_mcast) 1786 meshhdrlen = 1787 ieee80211_new_mesh_header(&mesh_hdr, 1788 sdata, 1789 skb->data + ETH_ALEN, 1790 NULL); 1791 else 1792 meshhdrlen = 1793 ieee80211_new_mesh_header(&mesh_hdr, 1794 sdata, 1795 skb->data, 1796 skb->data + ETH_ALEN); 1797 1798 } 1799 break; 1800 #endif 1801 case NL80211_IFTYPE_STATION: 1802 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1803 bool tdls_peer = false; 1804 1805 rcu_read_lock(); 1806 sta = sta_info_get(sdata, skb->data); 1807 if (sta) { 1808 authorized = test_sta_flag(sta, 1809 WLAN_STA_AUTHORIZED); 1810 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1811 tdls_peer = test_sta_flag(sta, 1812 WLAN_STA_TDLS_PEER); 1813 tdls_auth = test_sta_flag(sta, 1814 WLAN_STA_TDLS_PEER_AUTH); 1815 } 1816 rcu_read_unlock(); 1817 1818 /* 1819 * If the TDLS link is enabled, send everything 1820 * directly. Otherwise, allow TDLS setup frames 1821 * to be transmitted indirectly. 1822 */ 1823 tdls_direct = tdls_peer && (tdls_auth || 1824 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1825 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1826 } 1827 1828 if (tdls_direct) { 1829 /* link during setup - throw out frames to peer */ 1830 if (!tdls_auth) { 1831 ret = NETDEV_TX_OK; 1832 goto fail; 1833 } 1834 1835 /* DA SA BSSID */ 1836 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1837 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1838 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1839 hdrlen = 24; 1840 } else if (sdata->u.mgd.use_4addr && 1841 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1842 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1843 IEEE80211_FCTL_TODS); 1844 /* RA TA DA SA */ 1845 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1846 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1847 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1848 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1849 hdrlen = 30; 1850 } else { 1851 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1852 /* BSSID SA DA */ 1853 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1854 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1855 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1856 hdrlen = 24; 1857 } 1858 break; 1859 case NL80211_IFTYPE_ADHOC: 1860 /* DA SA BSSID */ 1861 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1862 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1863 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1864 hdrlen = 24; 1865 break; 1866 default: 1867 ret = NETDEV_TX_OK; 1868 goto fail; 1869 } 1870 1871 /* 1872 * There's no need to try to look up the destination 1873 * if it is a multicast address (which can only happen 1874 * in AP mode) 1875 */ 1876 if (!is_multicast_ether_addr(hdr.addr1)) { 1877 rcu_read_lock(); 1878 sta = sta_info_get(sdata, hdr.addr1); 1879 if (sta) { 1880 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1881 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1882 } 1883 rcu_read_unlock(); 1884 } 1885 1886 /* For mesh, the use of the QoS header is mandatory */ 1887 if (ieee80211_vif_is_mesh(&sdata->vif)) 1888 wme_sta = true; 1889 1890 /* receiver and we are QoS enabled, use a QoS type frame */ 1891 if (wme_sta && local->hw.queues >= 4) { 1892 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1893 hdrlen += 2; 1894 } 1895 1896 /* 1897 * Drop unicast frames to unauthorised stations unless they are 1898 * EAPOL frames from the local station. 1899 */ 1900 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1901 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1902 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1903 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1904 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1905 if (net_ratelimit()) 1906 printk(KERN_DEBUG "%s: dropped frame to %pM" 1907 " (unauthorized port)\n", dev->name, 1908 hdr.addr1); 1909 #endif 1910 1911 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1912 1913 ret = NETDEV_TX_OK; 1914 goto fail; 1915 } 1916 1917 /* 1918 * If the skb is shared we need to obtain our own copy. 1919 */ 1920 if (skb_shared(skb)) { 1921 tmp_skb = skb; 1922 skb = skb_clone(skb, GFP_ATOMIC); 1923 kfree_skb(tmp_skb); 1924 1925 if (!skb) { 1926 ret = NETDEV_TX_OK; 1927 goto fail; 1928 } 1929 } 1930 1931 hdr.frame_control = fc; 1932 hdr.duration_id = 0; 1933 hdr.seq_ctrl = 0; 1934 1935 skip_header_bytes = ETH_HLEN; 1936 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 1937 encaps_data = bridge_tunnel_header; 1938 encaps_len = sizeof(bridge_tunnel_header); 1939 skip_header_bytes -= 2; 1940 } else if (ethertype >= 0x600) { 1941 encaps_data = rfc1042_header; 1942 encaps_len = sizeof(rfc1042_header); 1943 skip_header_bytes -= 2; 1944 } else { 1945 encaps_data = NULL; 1946 encaps_len = 0; 1947 } 1948 1949 nh_pos = skb_network_header(skb) - skb->data; 1950 h_pos = skb_transport_header(skb) - skb->data; 1951 1952 skb_pull(skb, skip_header_bytes); 1953 nh_pos -= skip_header_bytes; 1954 h_pos -= skip_header_bytes; 1955 1956 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 1957 1958 /* 1959 * So we need to modify the skb header and hence need a copy of 1960 * that. The head_need variable above doesn't, so far, include 1961 * the needed header space that we don't need right away. If we 1962 * can, then we don't reallocate right now but only after the 1963 * frame arrives at the master device (if it does...) 1964 * 1965 * If we cannot, however, then we will reallocate to include all 1966 * the ever needed space. Also, if we need to reallocate it anyway, 1967 * make it big enough for everything we may ever need. 1968 */ 1969 1970 if (head_need > 0 || skb_cloned(skb)) { 1971 head_need += IEEE80211_ENCRYPT_HEADROOM; 1972 head_need += local->tx_headroom; 1973 head_need = max_t(int, 0, head_need); 1974 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 1975 goto fail; 1976 } 1977 1978 if (encaps_data) { 1979 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 1980 nh_pos += encaps_len; 1981 h_pos += encaps_len; 1982 } 1983 1984 #ifdef CONFIG_MAC80211_MESH 1985 if (meshhdrlen > 0) { 1986 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 1987 nh_pos += meshhdrlen; 1988 h_pos += meshhdrlen; 1989 } 1990 #endif 1991 1992 if (ieee80211_is_data_qos(fc)) { 1993 __le16 *qos_control; 1994 1995 qos_control = (__le16*) skb_push(skb, 2); 1996 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 1997 /* 1998 * Maybe we could actually set some fields here, for now just 1999 * initialise to zero to indicate no special operation. 2000 */ 2001 *qos_control = 0; 2002 } else 2003 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2004 2005 nh_pos += hdrlen; 2006 h_pos += hdrlen; 2007 2008 dev->stats.tx_packets++; 2009 dev->stats.tx_bytes += skb->len; 2010 2011 /* Update skb pointers to various headers since this modified frame 2012 * is going to go through Linux networking code that may potentially 2013 * need things like pointer to IP header. */ 2014 skb_set_mac_header(skb, 0); 2015 skb_set_network_header(skb, nh_pos); 2016 skb_set_transport_header(skb, h_pos); 2017 2018 info = IEEE80211_SKB_CB(skb); 2019 memset(info, 0, sizeof(*info)); 2020 2021 dev->trans_start = jiffies; 2022 ieee80211_xmit(sdata, skb); 2023 2024 return NETDEV_TX_OK; 2025 2026 fail: 2027 if (ret == NETDEV_TX_OK) 2028 dev_kfree_skb(skb); 2029 2030 return ret; 2031 } 2032 2033 2034 /* 2035 * ieee80211_clear_tx_pending may not be called in a context where 2036 * it is possible that it packets could come in again. 2037 */ 2038 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2039 { 2040 int i; 2041 2042 for (i = 0; i < local->hw.queues; i++) 2043 skb_queue_purge(&local->pending[i]); 2044 } 2045 2046 /* 2047 * Returns false if the frame couldn't be transmitted but was queued instead, 2048 * which in this case means re-queued -- take as an indication to stop sending 2049 * more pending frames. 2050 */ 2051 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2052 struct sk_buff *skb) 2053 { 2054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2055 struct ieee80211_sub_if_data *sdata; 2056 struct sta_info *sta; 2057 struct ieee80211_hdr *hdr; 2058 bool result; 2059 2060 sdata = vif_to_sdata(info->control.vif); 2061 2062 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2063 result = ieee80211_tx(sdata, skb, true); 2064 } else { 2065 hdr = (struct ieee80211_hdr *)skb->data; 2066 sta = sta_info_get(sdata, hdr->addr1); 2067 2068 result = __ieee80211_tx(local, &skb, sta, true); 2069 } 2070 2071 return result; 2072 } 2073 2074 /* 2075 * Transmit all pending packets. Called from tasklet. 2076 */ 2077 void ieee80211_tx_pending(unsigned long data) 2078 { 2079 struct ieee80211_local *local = (struct ieee80211_local *)data; 2080 struct ieee80211_sub_if_data *sdata; 2081 unsigned long flags; 2082 int i; 2083 bool txok; 2084 2085 rcu_read_lock(); 2086 2087 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2088 for (i = 0; i < local->hw.queues; i++) { 2089 /* 2090 * If queue is stopped by something other than due to pending 2091 * frames, or we have no pending frames, proceed to next queue. 2092 */ 2093 if (local->queue_stop_reasons[i] || 2094 skb_queue_empty(&local->pending[i])) 2095 continue; 2096 2097 while (!skb_queue_empty(&local->pending[i])) { 2098 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2099 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2100 2101 if (WARN_ON(!info->control.vif)) { 2102 kfree_skb(skb); 2103 continue; 2104 } 2105 2106 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2107 flags); 2108 2109 txok = ieee80211_tx_pending_skb(local, skb); 2110 spin_lock_irqsave(&local->queue_stop_reason_lock, 2111 flags); 2112 if (!txok) 2113 break; 2114 } 2115 2116 if (skb_queue_empty(&local->pending[i])) 2117 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2118 netif_wake_subqueue(sdata->dev, i); 2119 } 2120 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2121 2122 rcu_read_unlock(); 2123 } 2124 2125 /* functions for drivers to get certain frames */ 2126 2127 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, 2128 struct sk_buff *skb, 2129 struct beacon_data *beacon) 2130 { 2131 u8 *pos, *tim; 2132 int aid0 = 0; 2133 int i, have_bits = 0, n1, n2; 2134 2135 /* Generate bitmap for TIM only if there are any STAs in power save 2136 * mode. */ 2137 if (atomic_read(&bss->num_sta_ps) > 0) 2138 /* in the hope that this is faster than 2139 * checking byte-for-byte */ 2140 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2141 IEEE80211_MAX_AID+1); 2142 2143 if (bss->dtim_count == 0) 2144 bss->dtim_count = beacon->dtim_period - 1; 2145 else 2146 bss->dtim_count--; 2147 2148 tim = pos = (u8 *) skb_put(skb, 6); 2149 *pos++ = WLAN_EID_TIM; 2150 *pos++ = 4; 2151 *pos++ = bss->dtim_count; 2152 *pos++ = beacon->dtim_period; 2153 2154 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2155 aid0 = 1; 2156 2157 bss->dtim_bc_mc = aid0 == 1; 2158 2159 if (have_bits) { 2160 /* Find largest even number N1 so that bits numbered 1 through 2161 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2162 * (N2 + 1) x 8 through 2007 are 0. */ 2163 n1 = 0; 2164 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2165 if (bss->tim[i]) { 2166 n1 = i & 0xfe; 2167 break; 2168 } 2169 } 2170 n2 = n1; 2171 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2172 if (bss->tim[i]) { 2173 n2 = i; 2174 break; 2175 } 2176 } 2177 2178 /* Bitmap control */ 2179 *pos++ = n1 | aid0; 2180 /* Part Virt Bitmap */ 2181 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2182 2183 tim[1] = n2 - n1 + 4; 2184 skb_put(skb, n2 - n1); 2185 } else { 2186 *pos++ = aid0; /* Bitmap control */ 2187 *pos++ = 0; /* Part Virt Bitmap */ 2188 } 2189 } 2190 2191 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2192 struct ieee80211_vif *vif, 2193 u16 *tim_offset, u16 *tim_length) 2194 { 2195 struct ieee80211_local *local = hw_to_local(hw); 2196 struct sk_buff *skb = NULL; 2197 struct ieee80211_tx_info *info; 2198 struct ieee80211_sub_if_data *sdata = NULL; 2199 struct ieee80211_if_ap *ap = NULL; 2200 struct beacon_data *beacon; 2201 struct ieee80211_supported_band *sband; 2202 enum ieee80211_band band = local->hw.conf.channel->band; 2203 struct ieee80211_tx_rate_control txrc; 2204 2205 sband = local->hw.wiphy->bands[band]; 2206 2207 rcu_read_lock(); 2208 2209 sdata = vif_to_sdata(vif); 2210 2211 if (!ieee80211_sdata_running(sdata)) 2212 goto out; 2213 2214 if (tim_offset) 2215 *tim_offset = 0; 2216 if (tim_length) 2217 *tim_length = 0; 2218 2219 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2220 ap = &sdata->u.ap; 2221 beacon = rcu_dereference(ap->beacon); 2222 if (beacon) { 2223 /* 2224 * headroom, head length, 2225 * tail length and maximum TIM length 2226 */ 2227 skb = dev_alloc_skb(local->tx_headroom + 2228 beacon->head_len + 2229 beacon->tail_len + 256); 2230 if (!skb) 2231 goto out; 2232 2233 skb_reserve(skb, local->tx_headroom); 2234 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2235 beacon->head_len); 2236 2237 /* 2238 * Not very nice, but we want to allow the driver to call 2239 * ieee80211_beacon_get() as a response to the set_tim() 2240 * callback. That, however, is already invoked under the 2241 * sta_lock to guarantee consistent and race-free update 2242 * of the tim bitmap in mac80211 and the driver. 2243 */ 2244 if (local->tim_in_locked_section) { 2245 ieee80211_beacon_add_tim(ap, skb, beacon); 2246 } else { 2247 unsigned long flags; 2248 2249 spin_lock_irqsave(&local->sta_lock, flags); 2250 ieee80211_beacon_add_tim(ap, skb, beacon); 2251 spin_unlock_irqrestore(&local->sta_lock, flags); 2252 } 2253 2254 if (tim_offset) 2255 *tim_offset = beacon->head_len; 2256 if (tim_length) 2257 *tim_length = skb->len - beacon->head_len; 2258 2259 if (beacon->tail) 2260 memcpy(skb_put(skb, beacon->tail_len), 2261 beacon->tail, beacon->tail_len); 2262 } else 2263 goto out; 2264 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2265 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2266 struct ieee80211_hdr *hdr; 2267 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2268 2269 if (!presp) 2270 goto out; 2271 2272 skb = skb_copy(presp, GFP_ATOMIC); 2273 if (!skb) 2274 goto out; 2275 2276 hdr = (struct ieee80211_hdr *) skb->data; 2277 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2278 IEEE80211_STYPE_BEACON); 2279 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2280 struct ieee80211_mgmt *mgmt; 2281 u8 *pos; 2282 2283 #ifdef CONFIG_MAC80211_MESH 2284 if (!sdata->u.mesh.mesh_id_len) 2285 goto out; 2286 #endif 2287 2288 /* headroom, head length, tail length and maximum TIM length */ 2289 skb = dev_alloc_skb(local->tx_headroom + 400 + 2290 sdata->u.mesh.ie_len); 2291 if (!skb) 2292 goto out; 2293 2294 skb_reserve(skb, local->hw.extra_tx_headroom); 2295 mgmt = (struct ieee80211_mgmt *) 2296 skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 2297 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 2298 mgmt->frame_control = 2299 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2300 memset(mgmt->da, 0xff, ETH_ALEN); 2301 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2302 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2303 mgmt->u.beacon.beacon_int = 2304 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2305 mgmt->u.beacon.capab_info |= cpu_to_le16( 2306 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2307 2308 pos = skb_put(skb, 2); 2309 *pos++ = WLAN_EID_SSID; 2310 *pos++ = 0x0; 2311 2312 if (ieee80211_add_srates_ie(&sdata->vif, skb) || 2313 mesh_add_ds_params_ie(skb, sdata) || 2314 ieee80211_add_ext_srates_ie(&sdata->vif, skb) || 2315 mesh_add_rsn_ie(skb, sdata) || 2316 mesh_add_meshid_ie(skb, sdata) || 2317 mesh_add_meshconf_ie(skb, sdata) || 2318 mesh_add_vendor_ies(skb, sdata)) { 2319 pr_err("o11s: couldn't add ies!\n"); 2320 goto out; 2321 } 2322 } else { 2323 WARN_ON(1); 2324 goto out; 2325 } 2326 2327 info = IEEE80211_SKB_CB(skb); 2328 2329 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2330 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2331 info->band = band; 2332 2333 memset(&txrc, 0, sizeof(txrc)); 2334 txrc.hw = hw; 2335 txrc.sband = sband; 2336 txrc.bss_conf = &sdata->vif.bss_conf; 2337 txrc.skb = skb; 2338 txrc.reported_rate.idx = -1; 2339 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2340 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2341 txrc.max_rate_idx = -1; 2342 else 2343 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2344 txrc.bss = true; 2345 rate_control_get_rate(sdata, NULL, &txrc); 2346 2347 info->control.vif = vif; 2348 2349 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2350 IEEE80211_TX_CTL_ASSIGN_SEQ | 2351 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2352 out: 2353 rcu_read_unlock(); 2354 return skb; 2355 } 2356 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2357 2358 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2359 struct ieee80211_vif *vif) 2360 { 2361 struct ieee80211_sub_if_data *sdata; 2362 struct ieee80211_if_managed *ifmgd; 2363 struct ieee80211_pspoll *pspoll; 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(*pspoll)); 2375 if (!skb) 2376 return NULL; 2377 2378 skb_reserve(skb, local->hw.extra_tx_headroom); 2379 2380 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2381 memset(pspoll, 0, sizeof(*pspoll)); 2382 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2383 IEEE80211_STYPE_PSPOLL); 2384 pspoll->aid = cpu_to_le16(ifmgd->aid); 2385 2386 /* aid in PS-Poll has its two MSBs each set to 1 */ 2387 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2388 2389 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2390 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2391 2392 return skb; 2393 } 2394 EXPORT_SYMBOL(ieee80211_pspoll_get); 2395 2396 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2397 struct ieee80211_vif *vif) 2398 { 2399 struct ieee80211_hdr_3addr *nullfunc; 2400 struct ieee80211_sub_if_data *sdata; 2401 struct ieee80211_if_managed *ifmgd; 2402 struct ieee80211_local *local; 2403 struct sk_buff *skb; 2404 2405 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2406 return NULL; 2407 2408 sdata = vif_to_sdata(vif); 2409 ifmgd = &sdata->u.mgd; 2410 local = sdata->local; 2411 2412 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2413 if (!skb) 2414 return NULL; 2415 2416 skb_reserve(skb, local->hw.extra_tx_headroom); 2417 2418 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2419 sizeof(*nullfunc)); 2420 memset(nullfunc, 0, sizeof(*nullfunc)); 2421 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2422 IEEE80211_STYPE_NULLFUNC | 2423 IEEE80211_FCTL_TODS); 2424 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2425 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2426 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2427 2428 return skb; 2429 } 2430 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2431 2432 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2433 struct ieee80211_vif *vif, 2434 const u8 *ssid, size_t ssid_len, 2435 const u8 *ie, size_t ie_len) 2436 { 2437 struct ieee80211_sub_if_data *sdata; 2438 struct ieee80211_local *local; 2439 struct ieee80211_hdr_3addr *hdr; 2440 struct sk_buff *skb; 2441 size_t ie_ssid_len; 2442 u8 *pos; 2443 2444 sdata = vif_to_sdata(vif); 2445 local = sdata->local; 2446 ie_ssid_len = 2 + ssid_len; 2447 2448 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2449 ie_ssid_len + ie_len); 2450 if (!skb) 2451 return NULL; 2452 2453 skb_reserve(skb, local->hw.extra_tx_headroom); 2454 2455 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2456 memset(hdr, 0, sizeof(*hdr)); 2457 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2458 IEEE80211_STYPE_PROBE_REQ); 2459 memset(hdr->addr1, 0xff, ETH_ALEN); 2460 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2461 memset(hdr->addr3, 0xff, ETH_ALEN); 2462 2463 pos = skb_put(skb, ie_ssid_len); 2464 *pos++ = WLAN_EID_SSID; 2465 *pos++ = ssid_len; 2466 if (ssid) 2467 memcpy(pos, ssid, ssid_len); 2468 pos += ssid_len; 2469 2470 if (ie) { 2471 pos = skb_put(skb, ie_len); 2472 memcpy(pos, ie, ie_len); 2473 } 2474 2475 return skb; 2476 } 2477 EXPORT_SYMBOL(ieee80211_probereq_get); 2478 2479 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2480 const void *frame, size_t frame_len, 2481 const struct ieee80211_tx_info *frame_txctl, 2482 struct ieee80211_rts *rts) 2483 { 2484 const struct ieee80211_hdr *hdr = frame; 2485 2486 rts->frame_control = 2487 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2488 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2489 frame_txctl); 2490 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2491 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2492 } 2493 EXPORT_SYMBOL(ieee80211_rts_get); 2494 2495 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2496 const void *frame, size_t frame_len, 2497 const struct ieee80211_tx_info *frame_txctl, 2498 struct ieee80211_cts *cts) 2499 { 2500 const struct ieee80211_hdr *hdr = frame; 2501 2502 cts->frame_control = 2503 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2504 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2505 frame_len, frame_txctl); 2506 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2507 } 2508 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2509 2510 struct sk_buff * 2511 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2512 struct ieee80211_vif *vif) 2513 { 2514 struct ieee80211_local *local = hw_to_local(hw); 2515 struct sk_buff *skb = NULL; 2516 struct ieee80211_tx_data tx; 2517 struct ieee80211_sub_if_data *sdata; 2518 struct ieee80211_if_ap *bss = NULL; 2519 struct beacon_data *beacon; 2520 struct ieee80211_tx_info *info; 2521 2522 sdata = vif_to_sdata(vif); 2523 bss = &sdata->u.ap; 2524 2525 rcu_read_lock(); 2526 beacon = rcu_dereference(bss->beacon); 2527 2528 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2529 goto out; 2530 2531 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2532 goto out; /* send buffered bc/mc only after DTIM beacon */ 2533 2534 while (1) { 2535 skb = skb_dequeue(&bss->ps_bc_buf); 2536 if (!skb) 2537 goto out; 2538 local->total_ps_buffered--; 2539 2540 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2541 struct ieee80211_hdr *hdr = 2542 (struct ieee80211_hdr *) skb->data; 2543 /* more buffered multicast/broadcast frames ==> set 2544 * MoreData flag in IEEE 802.11 header to inform PS 2545 * STAs */ 2546 hdr->frame_control |= 2547 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2548 } 2549 2550 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2551 break; 2552 dev_kfree_skb_any(skb); 2553 } 2554 2555 info = IEEE80211_SKB_CB(skb); 2556 2557 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2558 tx.channel = local->hw.conf.channel; 2559 info->band = tx.channel->band; 2560 2561 if (invoke_tx_handlers(&tx)) 2562 skb = NULL; 2563 out: 2564 rcu_read_unlock(); 2565 2566 return skb; 2567 } 2568 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2569 2570 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 2571 { 2572 skb_set_mac_header(skb, 0); 2573 skb_set_network_header(skb, 0); 2574 skb_set_transport_header(skb, 0); 2575 2576 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ 2577 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 2578 skb->priority = 7; 2579 2580 /* 2581 * The other path calling ieee80211_xmit is from the tasklet, 2582 * and while we can handle concurrent transmissions locking 2583 * requirements are that we do not come into tx with bhs on. 2584 */ 2585 local_bh_disable(); 2586 ieee80211_xmit(sdata, skb); 2587 local_bh_enable(); 2588 } 2589