1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * 12 * Transmit and frame generation functions. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/bitmap.h> 20 #include <linux/rcupdate.h> 21 #include <linux/export.h> 22 #include <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <asm/unaligned.h> 27 28 #include "ieee80211_i.h" 29 #include "driver-ops.h" 30 #include "led.h" 31 #include "mesh.h" 32 #include "wep.h" 33 #include "wpa.h" 34 #include "wme.h" 35 #include "rate.h" 36 37 /* misc utils */ 38 39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 40 struct sk_buff *skb, int group_addr, 41 int next_frag_len) 42 { 43 int rate, mrate, erp, dur, i; 44 struct ieee80211_rate *txrate; 45 struct ieee80211_local *local = tx->local; 46 struct ieee80211_supported_band *sband; 47 struct ieee80211_hdr *hdr; 48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 49 50 /* assume HW handles this */ 51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS) 52 return 0; 53 54 /* uh huh? */ 55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0)) 56 return 0; 57 58 sband = local->hw.wiphy->bands[tx->channel->band]; 59 txrate = &sband->bitrates[info->control.rates[0].idx]; 60 61 erp = txrate->flags & IEEE80211_RATE_ERP_G; 62 63 /* 64 * data and mgmt (except PS Poll): 65 * - during CFP: 32768 66 * - during contention period: 67 * if addr1 is group address: 0 68 * if more fragments = 0 and addr1 is individual address: time to 69 * transmit one ACK plus SIFS 70 * if more fragments = 1 and addr1 is individual address: time to 71 * transmit next fragment plus 2 x ACK plus 3 x SIFS 72 * 73 * IEEE 802.11, 9.6: 74 * - control response frame (CTS or ACK) shall be transmitted using the 75 * same rate as the immediately previous frame in the frame exchange 76 * sequence, if this rate belongs to the PHY mandatory rates, or else 77 * at the highest possible rate belonging to the PHY rates in the 78 * BSSBasicRateSet 79 */ 80 hdr = (struct ieee80211_hdr *)skb->data; 81 if (ieee80211_is_ctl(hdr->frame_control)) { 82 /* TODO: These control frames are not currently sent by 83 * mac80211, but should they be implemented, this function 84 * needs to be updated to support duration field calculation. 85 * 86 * RTS: time needed to transmit pending data/mgmt frame plus 87 * one CTS frame plus one ACK frame plus 3 x SIFS 88 * CTS: duration of immediately previous RTS minus time 89 * required to transmit CTS and its SIFS 90 * ACK: 0 if immediately previous directed data/mgmt had 91 * more=0, with more=1 duration in ACK frame is duration 92 * from previous frame minus time needed to transmit ACK 93 * and its SIFS 94 * PS Poll: BIT(15) | BIT(14) | aid 95 */ 96 return 0; 97 } 98 99 /* data/mgmt */ 100 if (0 /* FIX: data/mgmt during CFP */) 101 return cpu_to_le16(32768); 102 103 if (group_addr) /* Group address as the destination - no ACK */ 104 return 0; 105 106 /* Individual destination address: 107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 108 * CTS and ACK frames shall be transmitted using the highest rate in 109 * basic rate set that is less than or equal to the rate of the 110 * immediately previous frame and that is using the same modulation 111 * (CCK or OFDM). If no basic rate set matches with these requirements, 112 * the highest mandatory rate of the PHY that is less than or equal to 113 * the rate of the previous frame is used. 114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 115 */ 116 rate = -1; 117 /* use lowest available if everything fails */ 118 mrate = sband->bitrates[0].bitrate; 119 for (i = 0; i < sband->n_bitrates; i++) { 120 struct ieee80211_rate *r = &sband->bitrates[i]; 121 122 if (r->bitrate > txrate->bitrate) 123 break; 124 125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 126 rate = r->bitrate; 127 128 switch (sband->band) { 129 case IEEE80211_BAND_2GHZ: { 130 u32 flag; 131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 132 flag = IEEE80211_RATE_MANDATORY_G; 133 else 134 flag = IEEE80211_RATE_MANDATORY_B; 135 if (r->flags & flag) 136 mrate = r->bitrate; 137 break; 138 } 139 case IEEE80211_BAND_5GHZ: 140 if (r->flags & IEEE80211_RATE_MANDATORY_A) 141 mrate = r->bitrate; 142 break; 143 case IEEE80211_NUM_BANDS: 144 WARN_ON(1); 145 break; 146 } 147 } 148 if (rate == -1) { 149 /* No matching basic rate found; use highest suitable mandatory 150 * PHY rate */ 151 rate = mrate; 152 } 153 154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 155 if (ieee80211_is_data_qos(hdr->frame_control) && 156 *(ieee80211_get_qos_ctl(hdr)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 157 dur = 0; 158 else 159 /* Time needed to transmit ACK 160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 161 * to closest integer */ 162 dur = ieee80211_frame_duration(local, 10, rate, erp, 163 tx->sdata->vif.bss_conf.use_short_preamble); 164 165 if (next_frag_len) { 166 /* Frame is fragmented: duration increases with time needed to 167 * transmit next fragment plus ACK and 2 x SIFS. */ 168 dur *= 2; /* ACK + SIFS */ 169 /* next fragment */ 170 dur += ieee80211_frame_duration(local, next_frag_len, 171 txrate->bitrate, erp, 172 tx->sdata->vif.bss_conf.use_short_preamble); 173 } 174 175 return cpu_to_le16(dur); 176 } 177 178 static inline int is_ieee80211_device(struct ieee80211_local *local, 179 struct net_device *dev) 180 { 181 return local == wdev_priv(dev->ieee80211_ptr); 182 } 183 184 /* tx handlers */ 185 static ieee80211_tx_result debug_noinline 186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 187 { 188 struct ieee80211_local *local = tx->local; 189 struct ieee80211_if_managed *ifmgd; 190 191 /* driver doesn't support power save */ 192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 193 return TX_CONTINUE; 194 195 /* hardware does dynamic power save */ 196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 197 return TX_CONTINUE; 198 199 /* dynamic power save disabled */ 200 if (local->hw.conf.dynamic_ps_timeout <= 0) 201 return TX_CONTINUE; 202 203 /* we are scanning, don't enable power save */ 204 if (local->scanning) 205 return TX_CONTINUE; 206 207 if (!local->ps_sdata) 208 return TX_CONTINUE; 209 210 /* No point if we're going to suspend */ 211 if (local->quiescing) 212 return TX_CONTINUE; 213 214 /* dynamic ps is supported only in managed mode */ 215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 216 return TX_CONTINUE; 217 218 ifmgd = &tx->sdata->u.mgd; 219 220 /* 221 * Don't wakeup from power save if u-apsd is enabled, voip ac has 222 * u-apsd enabled and the frame is in voip class. This effectively 223 * means that even if all access categories have u-apsd enabled, in 224 * practise u-apsd is only used with the voip ac. This is a 225 * workaround for the case when received voip class packets do not 226 * have correct qos tag for some reason, due the network or the 227 * peer application. 228 * 229 * Note: ifmgd->uapsd_queues access is racy here. If the value is 230 * changed via debugfs, user needs to reassociate manually to have 231 * everything in sync. 232 */ 233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) 234 && (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) 235 && skb_get_queue_mapping(tx->skb) == 0) 236 return TX_CONTINUE; 237 238 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 239 ieee80211_stop_queues_by_reason(&local->hw, 240 IEEE80211_QUEUE_STOP_REASON_PS); 241 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 242 ieee80211_queue_work(&local->hw, 243 &local->dynamic_ps_disable_work); 244 } 245 246 /* Don't restart the timer if we're not disassociated */ 247 if (!ifmgd->associated) 248 return TX_CONTINUE; 249 250 mod_timer(&local->dynamic_ps_timer, jiffies + 251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 252 253 return TX_CONTINUE; 254 } 255 256 static ieee80211_tx_result debug_noinline 257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 258 { 259 260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 262 bool assoc = false; 263 264 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 265 return TX_CONTINUE; 266 267 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 268 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 269 !ieee80211_is_probe_req(hdr->frame_control) && 270 !ieee80211_is_nullfunc(hdr->frame_control)) 271 /* 272 * When software scanning only nullfunc frames (to notify 273 * the sleep state to the AP) and probe requests (for the 274 * active scan) are allowed, all other frames should not be 275 * sent and we should not get here, but if we do 276 * nonetheless, drop them to avoid sending them 277 * off-channel. See the link below and 278 * ieee80211_start_scan() for more. 279 * 280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 281 */ 282 return TX_DROP; 283 284 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 285 return TX_CONTINUE; 286 287 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 288 return TX_CONTINUE; 289 290 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 291 return TX_CONTINUE; 292 293 if (tx->sta) 294 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 295 296 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 297 if (unlikely(!assoc && 298 ieee80211_is_data(hdr->frame_control))) { 299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 300 printk(KERN_DEBUG "%s: dropped data frame to not " 301 "associated station %pM\n", 302 tx->sdata->name, hdr->addr1); 303 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 304 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 305 return TX_DROP; 306 } 307 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 308 ieee80211_is_data(hdr->frame_control) && 309 !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) { 310 /* 311 * No associated STAs - no need to send multicast 312 * frames. 313 */ 314 return TX_DROP; 315 } 316 317 return TX_CONTINUE; 318 } 319 320 /* This function is called whenever the AP is about to exceed the maximum limit 321 * of buffered frames for power saving STAs. This situation should not really 322 * happen often during normal operation, so dropping the oldest buffered packet 323 * from each queue should be OK to make some room for new frames. */ 324 static void purge_old_ps_buffers(struct ieee80211_local *local) 325 { 326 int total = 0, purged = 0; 327 struct sk_buff *skb; 328 struct ieee80211_sub_if_data *sdata; 329 struct sta_info *sta; 330 331 /* 332 * virtual interfaces are protected by RCU 333 */ 334 rcu_read_lock(); 335 336 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 337 struct ieee80211_if_ap *ap; 338 if (sdata->vif.type != NL80211_IFTYPE_AP) 339 continue; 340 ap = &sdata->u.ap; 341 skb = skb_dequeue(&ap->ps_bc_buf); 342 if (skb) { 343 purged++; 344 dev_kfree_skb(skb); 345 } 346 total += skb_queue_len(&ap->ps_bc_buf); 347 } 348 349 /* 350 * Drop one frame from each station from the lowest-priority 351 * AC that has frames at all. 352 */ 353 list_for_each_entry_rcu(sta, &local->sta_list, list) { 354 int ac; 355 356 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 357 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 358 total += skb_queue_len(&sta->ps_tx_buf[ac]); 359 if (skb) { 360 purged++; 361 dev_kfree_skb(skb); 362 break; 363 } 364 } 365 } 366 367 rcu_read_unlock(); 368 369 local->total_ps_buffered = total; 370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 371 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n", 372 purged); 373 #endif 374 } 375 376 static ieee80211_tx_result 377 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 378 { 379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 381 382 /* 383 * broadcast/multicast frame 384 * 385 * If any of the associated stations is in power save mode, 386 * the frame is buffered to be sent after DTIM beacon frame. 387 * This is done either by the hardware or us. 388 */ 389 390 /* powersaving STAs only in AP/VLAN mode */ 391 if (!tx->sdata->bss) 392 return TX_CONTINUE; 393 394 /* no buffering for ordered frames */ 395 if (ieee80211_has_order(hdr->frame_control)) 396 return TX_CONTINUE; 397 398 /* no stations in PS mode */ 399 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 400 return TX_CONTINUE; 401 402 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 403 404 /* device releases frame after DTIM beacon */ 405 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 406 return TX_CONTINUE; 407 408 /* buffered in mac80211 */ 409 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 410 purge_old_ps_buffers(tx->local); 411 412 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 413 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 414 if (net_ratelimit()) 415 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n", 416 tx->sdata->name); 417 #endif 418 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 419 } else 420 tx->local->total_ps_buffered++; 421 422 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 423 424 return TX_QUEUED; 425 } 426 427 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 428 struct sk_buff *skb) 429 { 430 if (!ieee80211_is_mgmt(fc)) 431 return 0; 432 433 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 434 return 0; 435 436 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 437 skb->data)) 438 return 0; 439 440 return 1; 441 } 442 443 static ieee80211_tx_result 444 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 445 { 446 struct sta_info *sta = tx->sta; 447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 449 struct ieee80211_local *local = tx->local; 450 451 if (unlikely(!sta)) 452 return TX_CONTINUE; 453 454 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 455 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 456 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 457 int ac = skb_get_queue_mapping(tx->skb); 458 459 /* only deauth, disassoc and action are bufferable MMPDUs */ 460 if (ieee80211_is_mgmt(hdr->frame_control) && 461 !ieee80211_is_deauth(hdr->frame_control) && 462 !ieee80211_is_disassoc(hdr->frame_control) && 463 !ieee80211_is_action(hdr->frame_control)) { 464 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 465 return TX_CONTINUE; 466 } 467 468 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 469 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n", 470 sta->sta.addr, sta->sta.aid, ac); 471 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 473 purge_old_ps_buffers(tx->local); 474 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 475 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 476 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 477 if (net_ratelimit()) 478 printk(KERN_DEBUG "%s: STA %pM TX buffer for " 479 "AC %d full - dropping oldest frame\n", 480 tx->sdata->name, sta->sta.addr, ac); 481 #endif 482 dev_kfree_skb(old); 483 } else 484 tx->local->total_ps_buffered++; 485 486 info->control.jiffies = jiffies; 487 info->control.vif = &tx->sdata->vif; 488 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 489 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 490 491 if (!timer_pending(&local->sta_cleanup)) 492 mod_timer(&local->sta_cleanup, 493 round_jiffies(jiffies + 494 STA_INFO_CLEANUP_INTERVAL)); 495 496 /* 497 * We queued up some frames, so the TIM bit might 498 * need to be set, recalculate it. 499 */ 500 sta_info_recalc_tim(sta); 501 502 return TX_QUEUED; 503 } 504 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 505 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 506 printk(KERN_DEBUG 507 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n", 508 tx->sdata->name, sta->sta.addr); 509 } 510 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 511 512 return TX_CONTINUE; 513 } 514 515 static ieee80211_tx_result debug_noinline 516 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 517 { 518 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 519 return TX_CONTINUE; 520 521 if (tx->flags & IEEE80211_TX_UNICAST) 522 return ieee80211_tx_h_unicast_ps_buf(tx); 523 else 524 return ieee80211_tx_h_multicast_ps_buf(tx); 525 } 526 527 static ieee80211_tx_result debug_noinline 528 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 529 { 530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 531 532 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 533 tx->sdata->control_port_no_encrypt)) 534 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 535 536 return TX_CONTINUE; 537 } 538 539 static ieee80211_tx_result debug_noinline 540 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 541 { 542 struct ieee80211_key *key = NULL; 543 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 544 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 545 546 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 547 tx->key = NULL; 548 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 549 tx->key = key; 550 else if (ieee80211_is_mgmt(hdr->frame_control) && 551 is_multicast_ether_addr(hdr->addr1) && 552 ieee80211_is_robust_mgmt_frame(hdr) && 553 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 554 tx->key = key; 555 else if (is_multicast_ether_addr(hdr->addr1) && 556 (key = rcu_dereference(tx->sdata->default_multicast_key))) 557 tx->key = key; 558 else if (!is_multicast_ether_addr(hdr->addr1) && 559 (key = rcu_dereference(tx->sdata->default_unicast_key))) 560 tx->key = key; 561 else if (tx->sdata->drop_unencrypted && 562 (tx->skb->protocol != tx->sdata->control_port_protocol) && 563 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 564 (!ieee80211_is_robust_mgmt_frame(hdr) || 565 (ieee80211_is_action(hdr->frame_control) && 566 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) { 567 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 568 return TX_DROP; 569 } else 570 tx->key = NULL; 571 572 if (tx->key) { 573 bool skip_hw = false; 574 575 tx->key->tx_rx_count++; 576 /* TODO: add threshold stuff again */ 577 578 switch (tx->key->conf.cipher) { 579 case WLAN_CIPHER_SUITE_WEP40: 580 case WLAN_CIPHER_SUITE_WEP104: 581 case WLAN_CIPHER_SUITE_TKIP: 582 if (!ieee80211_is_data_present(hdr->frame_control)) 583 tx->key = NULL; 584 break; 585 case WLAN_CIPHER_SUITE_CCMP: 586 if (!ieee80211_is_data_present(hdr->frame_control) && 587 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 588 tx->skb)) 589 tx->key = NULL; 590 else 591 skip_hw = (tx->key->conf.flags & 592 IEEE80211_KEY_FLAG_SW_MGMT) && 593 ieee80211_is_mgmt(hdr->frame_control); 594 break; 595 case WLAN_CIPHER_SUITE_AES_CMAC: 596 if (!ieee80211_is_mgmt(hdr->frame_control)) 597 tx->key = NULL; 598 break; 599 } 600 601 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 602 return TX_DROP; 603 604 if (!skip_hw && tx->key && 605 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 606 info->control.hw_key = &tx->key->conf; 607 } 608 609 return TX_CONTINUE; 610 } 611 612 static ieee80211_tx_result debug_noinline 613 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 614 { 615 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 616 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 617 struct ieee80211_supported_band *sband; 618 struct ieee80211_rate *rate; 619 int i; 620 u32 len; 621 bool inval = false, rts = false, short_preamble = false; 622 struct ieee80211_tx_rate_control txrc; 623 bool assoc = false; 624 625 memset(&txrc, 0, sizeof(txrc)); 626 627 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 628 629 len = min_t(u32, tx->skb->len + FCS_LEN, 630 tx->local->hw.wiphy->frag_threshold); 631 632 /* set up the tx rate control struct we give the RC algo */ 633 txrc.hw = &tx->local->hw; 634 txrc.sband = sband; 635 txrc.bss_conf = &tx->sdata->vif.bss_conf; 636 txrc.skb = tx->skb; 637 txrc.reported_rate.idx = -1; 638 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 639 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 640 txrc.max_rate_idx = -1; 641 else 642 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 643 memcpy(txrc.rate_idx_mcs_mask, 644 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band], 645 sizeof(txrc.rate_idx_mcs_mask)); 646 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 647 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 648 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 649 650 /* set up RTS protection if desired */ 651 if (len > tx->local->hw.wiphy->rts_threshold) { 652 txrc.rts = rts = true; 653 } 654 655 /* 656 * Use short preamble if the BSS can handle it, but not for 657 * management frames unless we know the receiver can handle 658 * that -- the management frame might be to a station that 659 * just wants a probe response. 660 */ 661 if (tx->sdata->vif.bss_conf.use_short_preamble && 662 (ieee80211_is_data(hdr->frame_control) || 663 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 664 txrc.short_preamble = short_preamble = true; 665 666 if (tx->sta) 667 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 668 669 /* 670 * Lets not bother rate control if we're associated and cannot 671 * talk to the sta. This should not happen. 672 */ 673 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 674 !rate_usable_index_exists(sband, &tx->sta->sta), 675 "%s: Dropped data frame as no usable bitrate found while " 676 "scanning and associated. Target station: " 677 "%pM on %d GHz band\n", 678 tx->sdata->name, hdr->addr1, 679 tx->channel->band ? 5 : 2)) 680 return TX_DROP; 681 682 /* 683 * If we're associated with the sta at this point we know we can at 684 * least send the frame at the lowest bit rate. 685 */ 686 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 687 688 if (unlikely(info->control.rates[0].idx < 0)) 689 return TX_DROP; 690 691 if (txrc.reported_rate.idx < 0) { 692 txrc.reported_rate = info->control.rates[0]; 693 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 694 tx->sta->last_tx_rate = txrc.reported_rate; 695 } else if (tx->sta) 696 tx->sta->last_tx_rate = txrc.reported_rate; 697 698 if (unlikely(!info->control.rates[0].count)) 699 info->control.rates[0].count = 1; 700 701 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 702 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 703 info->control.rates[0].count = 1; 704 705 if (is_multicast_ether_addr(hdr->addr1)) { 706 /* 707 * XXX: verify the rate is in the basic rateset 708 */ 709 return TX_CONTINUE; 710 } 711 712 /* 713 * set up the RTS/CTS rate as the fastest basic rate 714 * that is not faster than the data rate 715 * 716 * XXX: Should this check all retry rates? 717 */ 718 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 719 s8 baserate = 0; 720 721 rate = &sband->bitrates[info->control.rates[0].idx]; 722 723 for (i = 0; i < sband->n_bitrates; i++) { 724 /* must be a basic rate */ 725 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 726 continue; 727 /* must not be faster than the data rate */ 728 if (sband->bitrates[i].bitrate > rate->bitrate) 729 continue; 730 /* maximum */ 731 if (sband->bitrates[baserate].bitrate < 732 sband->bitrates[i].bitrate) 733 baserate = i; 734 } 735 736 info->control.rts_cts_rate_idx = baserate; 737 } 738 739 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 740 /* 741 * make sure there's no valid rate following 742 * an invalid one, just in case drivers don't 743 * take the API seriously to stop at -1. 744 */ 745 if (inval) { 746 info->control.rates[i].idx = -1; 747 continue; 748 } 749 if (info->control.rates[i].idx < 0) { 750 inval = true; 751 continue; 752 } 753 754 /* 755 * For now assume MCS is already set up correctly, this 756 * needs to be fixed. 757 */ 758 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 759 WARN_ON(info->control.rates[i].idx > 76); 760 continue; 761 } 762 763 /* set up RTS protection if desired */ 764 if (rts) 765 info->control.rates[i].flags |= 766 IEEE80211_TX_RC_USE_RTS_CTS; 767 768 /* RC is busted */ 769 if (WARN_ON_ONCE(info->control.rates[i].idx >= 770 sband->n_bitrates)) { 771 info->control.rates[i].idx = -1; 772 continue; 773 } 774 775 rate = &sband->bitrates[info->control.rates[i].idx]; 776 777 /* set up short preamble */ 778 if (short_preamble && 779 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 780 info->control.rates[i].flags |= 781 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 782 783 /* set up G protection */ 784 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 785 rate->flags & IEEE80211_RATE_ERP_G) 786 info->control.rates[i].flags |= 787 IEEE80211_TX_RC_USE_CTS_PROTECT; 788 } 789 790 return TX_CONTINUE; 791 } 792 793 static ieee80211_tx_result debug_noinline 794 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 795 { 796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 797 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 798 u16 *seq; 799 u8 *qc; 800 int tid; 801 802 /* 803 * Packet injection may want to control the sequence 804 * number, if we have no matching interface then we 805 * neither assign one ourselves nor ask the driver to. 806 */ 807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 808 return TX_CONTINUE; 809 810 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 811 return TX_CONTINUE; 812 813 if (ieee80211_hdrlen(hdr->frame_control) < 24) 814 return TX_CONTINUE; 815 816 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 817 return TX_CONTINUE; 818 819 /* 820 * Anything but QoS data that has a sequence number field 821 * (is long enough) gets a sequence number from the global 822 * counter. 823 */ 824 if (!ieee80211_is_data_qos(hdr->frame_control)) { 825 /* driver should assign sequence number */ 826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 827 /* for pure STA mode without beacons, we can do it */ 828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 829 tx->sdata->sequence_number += 0x10; 830 return TX_CONTINUE; 831 } 832 833 /* 834 * This should be true for injected/management frames only, for 835 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 836 * above since they are not QoS-data frames. 837 */ 838 if (!tx->sta) 839 return TX_CONTINUE; 840 841 /* include per-STA, per-TID sequence counter */ 842 843 qc = ieee80211_get_qos_ctl(hdr); 844 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 845 seq = &tx->sta->tid_seq[tid]; 846 847 hdr->seq_ctrl = cpu_to_le16(*seq); 848 849 /* Increase the sequence number. */ 850 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 851 852 return TX_CONTINUE; 853 } 854 855 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 856 struct sk_buff *skb, int hdrlen, 857 int frag_threshold) 858 { 859 struct ieee80211_local *local = tx->local; 860 struct ieee80211_tx_info *info; 861 struct sk_buff *tmp; 862 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 863 int pos = hdrlen + per_fragm; 864 int rem = skb->len - hdrlen - per_fragm; 865 866 if (WARN_ON(rem < 0)) 867 return -EINVAL; 868 869 /* first fragment was already added to queue by caller */ 870 871 while (rem) { 872 int fraglen = per_fragm; 873 874 if (fraglen > rem) 875 fraglen = rem; 876 rem -= fraglen; 877 tmp = dev_alloc_skb(local->tx_headroom + 878 frag_threshold + 879 IEEE80211_ENCRYPT_HEADROOM + 880 IEEE80211_ENCRYPT_TAILROOM); 881 if (!tmp) 882 return -ENOMEM; 883 884 __skb_queue_tail(&tx->skbs, tmp); 885 886 skb_reserve(tmp, local->tx_headroom + 887 IEEE80211_ENCRYPT_HEADROOM); 888 /* copy control information */ 889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 890 891 info = IEEE80211_SKB_CB(tmp); 892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 893 IEEE80211_TX_CTL_FIRST_FRAGMENT); 894 895 if (rem) 896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 897 898 skb_copy_queue_mapping(tmp, skb); 899 tmp->priority = skb->priority; 900 tmp->dev = skb->dev; 901 902 /* copy header and data */ 903 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 904 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 905 906 pos += fraglen; 907 } 908 909 /* adjust first fragment's length */ 910 skb->len = hdrlen + per_fragm; 911 return 0; 912 } 913 914 static ieee80211_tx_result debug_noinline 915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 916 { 917 struct sk_buff *skb = tx->skb; 918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 919 struct ieee80211_hdr *hdr = (void *)skb->data; 920 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 921 int hdrlen; 922 int fragnum; 923 924 /* no matter what happens, tx->skb moves to tx->skbs */ 925 __skb_queue_tail(&tx->skbs, skb); 926 tx->skb = NULL; 927 928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 929 return TX_CONTINUE; 930 931 if (tx->local->ops->set_frag_threshold) 932 return TX_CONTINUE; 933 934 /* 935 * Warn when submitting a fragmented A-MPDU frame and drop it. 936 * This scenario is handled in ieee80211_tx_prepare but extra 937 * caution taken here as fragmented ampdu may cause Tx stop. 938 */ 939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 940 return TX_DROP; 941 942 hdrlen = ieee80211_hdrlen(hdr->frame_control); 943 944 /* internal error, why isn't DONTFRAG set? */ 945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 946 return TX_DROP; 947 948 /* 949 * Now fragment the frame. This will allocate all the fragments and 950 * chain them (using skb as the first fragment) to skb->next. 951 * During transmission, we will remove the successfully transmitted 952 * fragments from this list. When the low-level driver rejects one 953 * of the fragments then we will simply pretend to accept the skb 954 * but store it away as pending. 955 */ 956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 957 return TX_DROP; 958 959 /* update duration/seq/flags of fragments */ 960 fragnum = 0; 961 962 skb_queue_walk(&tx->skbs, skb) { 963 int next_len; 964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 965 966 hdr = (void *)skb->data; 967 info = IEEE80211_SKB_CB(skb); 968 969 if (!skb_queue_is_last(&tx->skbs, skb)) { 970 hdr->frame_control |= morefrags; 971 /* 972 * No multi-rate retries for fragmented frames, that 973 * would completely throw off the NAV at other STAs. 974 */ 975 info->control.rates[1].idx = -1; 976 info->control.rates[2].idx = -1; 977 info->control.rates[3].idx = -1; 978 info->control.rates[4].idx = -1; 979 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 980 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 981 } else { 982 hdr->frame_control &= ~morefrags; 983 next_len = 0; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 997 if (!tx->sta) 998 return TX_CONTINUE; 999 1000 tx->sta->tx_packets++; 1001 skb_queue_walk(&tx->skbs, skb) { 1002 tx->sta->tx_fragments++; 1003 tx->sta->tx_bytes += skb->len; 1004 } 1005 1006 return TX_CONTINUE; 1007 } 1008 1009 static ieee80211_tx_result debug_noinline 1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1011 { 1012 if (!tx->key) 1013 return TX_CONTINUE; 1014 1015 switch (tx->key->conf.cipher) { 1016 case WLAN_CIPHER_SUITE_WEP40: 1017 case WLAN_CIPHER_SUITE_WEP104: 1018 return ieee80211_crypto_wep_encrypt(tx); 1019 case WLAN_CIPHER_SUITE_TKIP: 1020 return ieee80211_crypto_tkip_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_CCMP: 1022 return ieee80211_crypto_ccmp_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_AES_CMAC: 1024 return ieee80211_crypto_aes_cmac_encrypt(tx); 1025 default: 1026 return ieee80211_crypto_hw_encrypt(tx); 1027 } 1028 1029 return TX_DROP; 1030 } 1031 1032 static ieee80211_tx_result debug_noinline 1033 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1034 { 1035 struct sk_buff *skb; 1036 struct ieee80211_hdr *hdr; 1037 int next_len; 1038 bool group_addr; 1039 1040 skb_queue_walk(&tx->skbs, skb) { 1041 hdr = (void *) skb->data; 1042 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1043 break; /* must not overwrite AID */ 1044 if (!skb_queue_is_last(&tx->skbs, skb)) { 1045 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1046 next_len = next->len; 1047 } else 1048 next_len = 0; 1049 group_addr = is_multicast_ether_addr(hdr->addr1); 1050 1051 hdr->duration_id = 1052 ieee80211_duration(tx, skb, group_addr, next_len); 1053 } 1054 1055 return TX_CONTINUE; 1056 } 1057 1058 /* actual transmit path */ 1059 1060 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1061 struct sk_buff *skb, 1062 struct ieee80211_tx_info *info, 1063 struct tid_ampdu_tx *tid_tx, 1064 int tid) 1065 { 1066 bool queued = false; 1067 bool reset_agg_timer = false; 1068 struct sk_buff *purge_skb = NULL; 1069 1070 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1071 info->flags |= IEEE80211_TX_CTL_AMPDU; 1072 reset_agg_timer = true; 1073 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1074 /* 1075 * nothing -- this aggregation session is being started 1076 * but that might still fail with the driver 1077 */ 1078 } else { 1079 spin_lock(&tx->sta->lock); 1080 /* 1081 * Need to re-check now, because we may get here 1082 * 1083 * 1) in the window during which the setup is actually 1084 * already done, but not marked yet because not all 1085 * packets are spliced over to the driver pending 1086 * queue yet -- if this happened we acquire the lock 1087 * either before or after the splice happens, but 1088 * need to recheck which of these cases happened. 1089 * 1090 * 2) during session teardown, if the OPERATIONAL bit 1091 * was cleared due to the teardown but the pointer 1092 * hasn't been assigned NULL yet (or we loaded it 1093 * before it was assigned) -- in this case it may 1094 * now be NULL which means we should just let the 1095 * packet pass through because splicing the frames 1096 * back is already done. 1097 */ 1098 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1099 1100 if (!tid_tx) { 1101 /* do nothing, let packet pass through */ 1102 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1103 info->flags |= IEEE80211_TX_CTL_AMPDU; 1104 reset_agg_timer = true; 1105 } else { 1106 queued = true; 1107 info->control.vif = &tx->sdata->vif; 1108 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1109 __skb_queue_tail(&tid_tx->pending, skb); 1110 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1111 purge_skb = __skb_dequeue(&tid_tx->pending); 1112 } 1113 spin_unlock(&tx->sta->lock); 1114 1115 if (purge_skb) 1116 dev_kfree_skb(purge_skb); 1117 } 1118 1119 /* reset session timer */ 1120 if (reset_agg_timer && tid_tx->timeout) 1121 mod_timer(&tid_tx->session_timer, 1122 TU_TO_EXP_TIME(tid_tx->timeout)); 1123 1124 return queued; 1125 } 1126 1127 /* 1128 * initialises @tx 1129 */ 1130 static ieee80211_tx_result 1131 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1132 struct ieee80211_tx_data *tx, 1133 struct sk_buff *skb) 1134 { 1135 struct ieee80211_local *local = sdata->local; 1136 struct ieee80211_hdr *hdr; 1137 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1138 int tid; 1139 u8 *qc; 1140 1141 memset(tx, 0, sizeof(*tx)); 1142 tx->skb = skb; 1143 tx->local = local; 1144 tx->sdata = sdata; 1145 tx->channel = local->hw.conf.channel; 1146 __skb_queue_head_init(&tx->skbs); 1147 1148 /* 1149 * If this flag is set to true anywhere, and we get here, 1150 * we are doing the needed processing, so remove the flag 1151 * now. 1152 */ 1153 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1154 1155 hdr = (struct ieee80211_hdr *) skb->data; 1156 1157 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1158 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1159 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1160 return TX_DROP; 1161 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1162 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1163 } 1164 if (!tx->sta) 1165 tx->sta = sta_info_get(sdata, hdr->addr1); 1166 1167 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1168 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1169 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1170 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1171 struct tid_ampdu_tx *tid_tx; 1172 1173 qc = ieee80211_get_qos_ctl(hdr); 1174 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1175 1176 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1177 if (tid_tx) { 1178 bool queued; 1179 1180 queued = ieee80211_tx_prep_agg(tx, skb, info, 1181 tid_tx, tid); 1182 1183 if (unlikely(queued)) 1184 return TX_QUEUED; 1185 } 1186 } 1187 1188 if (is_multicast_ether_addr(hdr->addr1)) { 1189 tx->flags &= ~IEEE80211_TX_UNICAST; 1190 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1191 } else 1192 tx->flags |= IEEE80211_TX_UNICAST; 1193 1194 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1195 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1196 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1197 info->flags & IEEE80211_TX_CTL_AMPDU) 1198 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1199 } 1200 1201 if (!tx->sta) 1202 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1203 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1204 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1205 1206 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1207 1208 return TX_CONTINUE; 1209 } 1210 1211 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1212 struct ieee80211_vif *vif, 1213 struct ieee80211_sta *sta, 1214 struct sk_buff_head *skbs, 1215 bool txpending) 1216 { 1217 struct sk_buff *skb, *tmp; 1218 struct ieee80211_tx_info *info; 1219 unsigned long flags; 1220 1221 skb_queue_walk_safe(skbs, skb, tmp) { 1222 int q = skb_get_queue_mapping(skb); 1223 1224 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1225 if (local->queue_stop_reasons[q] || 1226 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1227 /* 1228 * Since queue is stopped, queue up frames for later 1229 * transmission from the tx-pending tasklet when the 1230 * queue is woken again. 1231 */ 1232 if (txpending) 1233 skb_queue_splice_init(skbs, &local->pending[q]); 1234 else 1235 skb_queue_splice_tail_init(skbs, 1236 &local->pending[q]); 1237 1238 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1239 flags); 1240 return false; 1241 } 1242 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1243 1244 info = IEEE80211_SKB_CB(skb); 1245 info->control.vif = vif; 1246 info->control.sta = sta; 1247 1248 __skb_unlink(skb, skbs); 1249 drv_tx(local, skb); 1250 } 1251 1252 return true; 1253 } 1254 1255 /* 1256 * Returns false if the frame couldn't be transmitted but was queued instead. 1257 */ 1258 static bool __ieee80211_tx(struct ieee80211_local *local, 1259 struct sk_buff_head *skbs, int led_len, 1260 struct sta_info *sta, bool txpending) 1261 { 1262 struct ieee80211_tx_info *info; 1263 struct ieee80211_sub_if_data *sdata; 1264 struct ieee80211_vif *vif; 1265 struct ieee80211_sta *pubsta; 1266 struct sk_buff *skb; 1267 bool result = true; 1268 __le16 fc; 1269 1270 if (WARN_ON(skb_queue_empty(skbs))) 1271 return true; 1272 1273 skb = skb_peek(skbs); 1274 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1275 info = IEEE80211_SKB_CB(skb); 1276 sdata = vif_to_sdata(info->control.vif); 1277 if (sta && !sta->uploaded) 1278 sta = NULL; 1279 1280 if (sta) 1281 pubsta = &sta->sta; 1282 else 1283 pubsta = NULL; 1284 1285 switch (sdata->vif.type) { 1286 case NL80211_IFTYPE_MONITOR: 1287 sdata = NULL; 1288 vif = NULL; 1289 break; 1290 case NL80211_IFTYPE_AP_VLAN: 1291 sdata = container_of(sdata->bss, 1292 struct ieee80211_sub_if_data, u.ap); 1293 /* fall through */ 1294 default: 1295 vif = &sdata->vif; 1296 break; 1297 } 1298 1299 if (local->ops->tx_frags) 1300 drv_tx_frags(local, vif, pubsta, skbs); 1301 else 1302 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1303 txpending); 1304 1305 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1306 ieee80211_led_tx(local, 1); 1307 1308 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1309 1310 return result; 1311 } 1312 1313 /* 1314 * Invoke TX handlers, return 0 on success and non-zero if the 1315 * frame was dropped or queued. 1316 */ 1317 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1318 { 1319 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1320 ieee80211_tx_result res = TX_DROP; 1321 1322 #define CALL_TXH(txh) \ 1323 do { \ 1324 res = txh(tx); \ 1325 if (res != TX_CONTINUE) \ 1326 goto txh_done; \ 1327 } while (0) 1328 1329 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1330 CALL_TXH(ieee80211_tx_h_check_assoc); 1331 CALL_TXH(ieee80211_tx_h_ps_buf); 1332 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1333 CALL_TXH(ieee80211_tx_h_select_key); 1334 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1335 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1336 1337 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1338 __skb_queue_tail(&tx->skbs, tx->skb); 1339 tx->skb = NULL; 1340 goto txh_done; 1341 } 1342 1343 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1344 CALL_TXH(ieee80211_tx_h_sequence); 1345 CALL_TXH(ieee80211_tx_h_fragment); 1346 /* handlers after fragment must be aware of tx info fragmentation! */ 1347 CALL_TXH(ieee80211_tx_h_stats); 1348 CALL_TXH(ieee80211_tx_h_encrypt); 1349 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1350 CALL_TXH(ieee80211_tx_h_calculate_duration); 1351 #undef CALL_TXH 1352 1353 txh_done: 1354 if (unlikely(res == TX_DROP)) { 1355 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1356 if (tx->skb) 1357 dev_kfree_skb(tx->skb); 1358 else 1359 __skb_queue_purge(&tx->skbs); 1360 return -1; 1361 } else if (unlikely(res == TX_QUEUED)) { 1362 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1363 return -1; 1364 } 1365 1366 return 0; 1367 } 1368 1369 /* 1370 * Returns false if the frame couldn't be transmitted but was queued instead. 1371 */ 1372 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1373 struct sk_buff *skb, bool txpending) 1374 { 1375 struct ieee80211_local *local = sdata->local; 1376 struct ieee80211_tx_data tx; 1377 ieee80211_tx_result res_prepare; 1378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1379 bool result = true; 1380 int led_len; 1381 1382 if (unlikely(skb->len < 10)) { 1383 dev_kfree_skb(skb); 1384 return true; 1385 } 1386 1387 rcu_read_lock(); 1388 1389 /* initialises tx */ 1390 led_len = skb->len; 1391 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1392 1393 if (unlikely(res_prepare == TX_DROP)) { 1394 dev_kfree_skb(skb); 1395 goto out; 1396 } else if (unlikely(res_prepare == TX_QUEUED)) { 1397 goto out; 1398 } 1399 1400 tx.channel = local->hw.conf.channel; 1401 info->band = tx.channel->band; 1402 1403 if (!invoke_tx_handlers(&tx)) 1404 result = __ieee80211_tx(local, &tx.skbs, led_len, 1405 tx.sta, txpending); 1406 out: 1407 rcu_read_unlock(); 1408 return result; 1409 } 1410 1411 /* device xmit handlers */ 1412 1413 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1414 struct sk_buff *skb, 1415 int head_need, bool may_encrypt) 1416 { 1417 struct ieee80211_local *local = sdata->local; 1418 int tail_need = 0; 1419 1420 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1421 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1422 tail_need -= skb_tailroom(skb); 1423 tail_need = max_t(int, tail_need, 0); 1424 } 1425 1426 if (skb_cloned(skb)) 1427 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1428 else if (head_need || tail_need) 1429 I802_DEBUG_INC(local->tx_expand_skb_head); 1430 else 1431 return 0; 1432 1433 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1434 wiphy_debug(local->hw.wiphy, 1435 "failed to reallocate TX buffer\n"); 1436 return -ENOMEM; 1437 } 1438 1439 return 0; 1440 } 1441 1442 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1443 { 1444 struct ieee80211_local *local = sdata->local; 1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1447 int headroom; 1448 bool may_encrypt; 1449 1450 rcu_read_lock(); 1451 1452 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1453 1454 headroom = local->tx_headroom; 1455 if (may_encrypt) 1456 headroom += IEEE80211_ENCRYPT_HEADROOM; 1457 headroom -= skb_headroom(skb); 1458 headroom = max_t(int, 0, headroom); 1459 1460 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1461 dev_kfree_skb(skb); 1462 rcu_read_unlock(); 1463 return; 1464 } 1465 1466 hdr = (struct ieee80211_hdr *) skb->data; 1467 info->control.vif = &sdata->vif; 1468 1469 if (ieee80211_vif_is_mesh(&sdata->vif) && 1470 ieee80211_is_data(hdr->frame_control) && 1471 !is_multicast_ether_addr(hdr->addr1)) 1472 if (mesh_nexthop_resolve(skb, sdata)) { 1473 /* skb queued: don't free */ 1474 rcu_read_unlock(); 1475 return; 1476 } 1477 1478 ieee80211_set_qos_hdr(sdata, skb); 1479 ieee80211_tx(sdata, skb, false); 1480 rcu_read_unlock(); 1481 } 1482 1483 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1484 { 1485 struct ieee80211_radiotap_iterator iterator; 1486 struct ieee80211_radiotap_header *rthdr = 1487 (struct ieee80211_radiotap_header *) skb->data; 1488 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1489 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1490 NULL); 1491 u16 txflags; 1492 1493 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1494 IEEE80211_TX_CTL_DONTFRAG; 1495 1496 /* 1497 * for every radiotap entry that is present 1498 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1499 * entries present, or -EINVAL on error) 1500 */ 1501 1502 while (!ret) { 1503 ret = ieee80211_radiotap_iterator_next(&iterator); 1504 1505 if (ret) 1506 continue; 1507 1508 /* see if this argument is something we can use */ 1509 switch (iterator.this_arg_index) { 1510 /* 1511 * You must take care when dereferencing iterator.this_arg 1512 * for multibyte types... the pointer is not aligned. Use 1513 * get_unaligned((type *)iterator.this_arg) to dereference 1514 * iterator.this_arg for type "type" safely on all arches. 1515 */ 1516 case IEEE80211_RADIOTAP_FLAGS: 1517 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1518 /* 1519 * this indicates that the skb we have been 1520 * handed has the 32-bit FCS CRC at the end... 1521 * we should react to that by snipping it off 1522 * because it will be recomputed and added 1523 * on transmission 1524 */ 1525 if (skb->len < (iterator._max_length + FCS_LEN)) 1526 return false; 1527 1528 skb_trim(skb, skb->len - FCS_LEN); 1529 } 1530 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1531 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1532 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1533 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1534 break; 1535 1536 case IEEE80211_RADIOTAP_TX_FLAGS: 1537 txflags = get_unaligned_le16(iterator.this_arg); 1538 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1539 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1540 break; 1541 1542 /* 1543 * Please update the file 1544 * Documentation/networking/mac80211-injection.txt 1545 * when parsing new fields here. 1546 */ 1547 1548 default: 1549 break; 1550 } 1551 } 1552 1553 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1554 return false; 1555 1556 /* 1557 * remove the radiotap header 1558 * iterator->_max_length was sanity-checked against 1559 * skb->len by iterator init 1560 */ 1561 skb_pull(skb, iterator._max_length); 1562 1563 return true; 1564 } 1565 1566 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1567 struct net_device *dev) 1568 { 1569 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1570 struct ieee80211_channel *chan = local->hw.conf.channel; 1571 struct ieee80211_radiotap_header *prthdr = 1572 (struct ieee80211_radiotap_header *)skb->data; 1573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1574 struct ieee80211_hdr *hdr; 1575 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1576 u16 len_rthdr; 1577 int hdrlen; 1578 1579 /* 1580 * Frame injection is not allowed if beaconing is not allowed 1581 * or if we need radar detection. Beaconing is usually not allowed when 1582 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1583 * Passive scan is also used in world regulatory domains where 1584 * your country is not known and as such it should be treated as 1585 * NO TX unless the channel is explicitly allowed in which case 1586 * your current regulatory domain would not have the passive scan 1587 * flag. 1588 * 1589 * Since AP mode uses monitor interfaces to inject/TX management 1590 * frames we can make AP mode the exception to this rule once it 1591 * supports radar detection as its implementation can deal with 1592 * radar detection by itself. We can do that later by adding a 1593 * monitor flag interfaces used for AP support. 1594 */ 1595 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1596 IEEE80211_CHAN_PASSIVE_SCAN))) 1597 goto fail; 1598 1599 /* check for not even having the fixed radiotap header part */ 1600 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1601 goto fail; /* too short to be possibly valid */ 1602 1603 /* is it a header version we can trust to find length from? */ 1604 if (unlikely(prthdr->it_version)) 1605 goto fail; /* only version 0 is supported */ 1606 1607 /* then there must be a radiotap header with a length we can use */ 1608 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1609 1610 /* does the skb contain enough to deliver on the alleged length? */ 1611 if (unlikely(skb->len < len_rthdr)) 1612 goto fail; /* skb too short for claimed rt header extent */ 1613 1614 /* 1615 * fix up the pointers accounting for the radiotap 1616 * header still being in there. We are being given 1617 * a precooked IEEE80211 header so no need for 1618 * normal processing 1619 */ 1620 skb_set_mac_header(skb, len_rthdr); 1621 /* 1622 * these are just fixed to the end of the rt area since we 1623 * don't have any better information and at this point, nobody cares 1624 */ 1625 skb_set_network_header(skb, len_rthdr); 1626 skb_set_transport_header(skb, len_rthdr); 1627 1628 if (skb->len < len_rthdr + 2) 1629 goto fail; 1630 1631 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1632 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1633 1634 if (skb->len < len_rthdr + hdrlen) 1635 goto fail; 1636 1637 /* 1638 * Initialize skb->protocol if the injected frame is a data frame 1639 * carrying a rfc1042 header 1640 */ 1641 if (ieee80211_is_data(hdr->frame_control) && 1642 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1643 u8 *payload = (u8 *)hdr + hdrlen; 1644 1645 if (compare_ether_addr(payload, rfc1042_header) == 0) 1646 skb->protocol = cpu_to_be16((payload[6] << 8) | 1647 payload[7]); 1648 } 1649 1650 memset(info, 0, sizeof(*info)); 1651 1652 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1653 IEEE80211_TX_CTL_INJECTED; 1654 1655 /* process and remove the injection radiotap header */ 1656 if (!ieee80211_parse_tx_radiotap(skb)) 1657 goto fail; 1658 1659 rcu_read_lock(); 1660 1661 /* 1662 * We process outgoing injected frames that have a local address 1663 * we handle as though they are non-injected frames. 1664 * This code here isn't entirely correct, the local MAC address 1665 * isn't always enough to find the interface to use; for proper 1666 * VLAN/WDS support we will need a different mechanism (which 1667 * likely isn't going to be monitor interfaces). 1668 */ 1669 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1670 1671 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1672 if (!ieee80211_sdata_running(tmp_sdata)) 1673 continue; 1674 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1675 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1676 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1677 continue; 1678 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { 1679 sdata = tmp_sdata; 1680 break; 1681 } 1682 } 1683 1684 ieee80211_xmit(sdata, skb); 1685 rcu_read_unlock(); 1686 1687 return NETDEV_TX_OK; 1688 1689 fail: 1690 dev_kfree_skb(skb); 1691 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1692 } 1693 1694 /** 1695 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1696 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1697 * @skb: packet to be sent 1698 * @dev: incoming interface 1699 * 1700 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1701 * not be freed, and caller is responsible for either retrying later or freeing 1702 * skb). 1703 * 1704 * This function takes in an Ethernet header and encapsulates it with suitable 1705 * IEEE 802.11 header based on which interface the packet is coming in. The 1706 * encapsulated packet will then be passed to master interface, wlan#.11, for 1707 * transmission (through low-level driver). 1708 */ 1709 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1710 struct net_device *dev) 1711 { 1712 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1713 struct ieee80211_local *local = sdata->local; 1714 struct ieee80211_tx_info *info; 1715 int ret = NETDEV_TX_BUSY, head_need; 1716 u16 ethertype, hdrlen, meshhdrlen = 0; 1717 __le16 fc; 1718 struct ieee80211_hdr hdr; 1719 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1720 struct mesh_path __maybe_unused *mppath = NULL; 1721 const u8 *encaps_data; 1722 int encaps_len, skip_header_bytes; 1723 int nh_pos, h_pos; 1724 struct sta_info *sta = NULL; 1725 bool wme_sta = false, authorized = false, tdls_auth = false; 1726 bool tdls_direct = false; 1727 bool multicast; 1728 u32 info_flags = 0; 1729 u16 info_id = 0; 1730 1731 if (unlikely(skb->len < ETH_HLEN)) { 1732 ret = NETDEV_TX_OK; 1733 goto fail; 1734 } 1735 1736 /* convert Ethernet header to proper 802.11 header (based on 1737 * operation mode) */ 1738 ethertype = (skb->data[12] << 8) | skb->data[13]; 1739 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1740 1741 switch (sdata->vif.type) { 1742 case NL80211_IFTYPE_AP_VLAN: 1743 rcu_read_lock(); 1744 sta = rcu_dereference(sdata->u.vlan.sta); 1745 if (sta) { 1746 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1747 /* RA TA DA SA */ 1748 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1749 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1750 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1751 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1752 hdrlen = 30; 1753 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1754 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1755 } 1756 rcu_read_unlock(); 1757 if (sta) 1758 break; 1759 /* fall through */ 1760 case NL80211_IFTYPE_AP: 1761 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1762 /* DA BSSID SA */ 1763 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1764 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1765 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1766 hdrlen = 24; 1767 break; 1768 case NL80211_IFTYPE_WDS: 1769 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1770 /* RA TA DA SA */ 1771 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1772 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1773 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1774 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1775 hdrlen = 30; 1776 break; 1777 #ifdef CONFIG_MAC80211_MESH 1778 case NL80211_IFTYPE_MESH_POINT: 1779 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1780 /* Do not send frames with mesh_ttl == 0 */ 1781 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1782 ret = NETDEV_TX_OK; 1783 goto fail; 1784 } 1785 rcu_read_lock(); 1786 if (!is_multicast_ether_addr(skb->data)) 1787 mppath = mpp_path_lookup(skb->data, sdata); 1788 1789 /* 1790 * Use address extension if it is a packet from 1791 * another interface or if we know the destination 1792 * is being proxied by a portal (i.e. portal address 1793 * differs from proxied address) 1794 */ 1795 if (compare_ether_addr(sdata->vif.addr, 1796 skb->data + ETH_ALEN) == 0 && 1797 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { 1798 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1799 skb->data, skb->data + ETH_ALEN); 1800 rcu_read_unlock(); 1801 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1802 sdata, NULL, NULL); 1803 } else { 1804 int is_mesh_mcast = 1; 1805 const u8 *mesh_da; 1806 1807 if (is_multicast_ether_addr(skb->data)) 1808 /* DA TA mSA AE:SA */ 1809 mesh_da = skb->data; 1810 else { 1811 static const u8 bcast[ETH_ALEN] = 1812 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1813 if (mppath) { 1814 /* RA TA mDA mSA AE:DA SA */ 1815 mesh_da = mppath->mpp; 1816 is_mesh_mcast = 0; 1817 } else { 1818 /* DA TA mSA AE:SA */ 1819 mesh_da = bcast; 1820 } 1821 } 1822 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1823 mesh_da, sdata->vif.addr); 1824 rcu_read_unlock(); 1825 if (is_mesh_mcast) 1826 meshhdrlen = 1827 ieee80211_new_mesh_header(&mesh_hdr, 1828 sdata, 1829 skb->data + ETH_ALEN, 1830 NULL); 1831 else 1832 meshhdrlen = 1833 ieee80211_new_mesh_header(&mesh_hdr, 1834 sdata, 1835 skb->data, 1836 skb->data + ETH_ALEN); 1837 1838 } 1839 break; 1840 #endif 1841 case NL80211_IFTYPE_STATION: 1842 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1843 bool tdls_peer = false; 1844 1845 rcu_read_lock(); 1846 sta = sta_info_get(sdata, skb->data); 1847 if (sta) { 1848 authorized = test_sta_flag(sta, 1849 WLAN_STA_AUTHORIZED); 1850 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1851 tdls_peer = test_sta_flag(sta, 1852 WLAN_STA_TDLS_PEER); 1853 tdls_auth = test_sta_flag(sta, 1854 WLAN_STA_TDLS_PEER_AUTH); 1855 } 1856 rcu_read_unlock(); 1857 1858 /* 1859 * If the TDLS link is enabled, send everything 1860 * directly. Otherwise, allow TDLS setup frames 1861 * to be transmitted indirectly. 1862 */ 1863 tdls_direct = tdls_peer && (tdls_auth || 1864 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1865 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1866 } 1867 1868 if (tdls_direct) { 1869 /* link during setup - throw out frames to peer */ 1870 if (!tdls_auth) { 1871 ret = NETDEV_TX_OK; 1872 goto fail; 1873 } 1874 1875 /* DA SA BSSID */ 1876 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1877 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1878 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1879 hdrlen = 24; 1880 } else if (sdata->u.mgd.use_4addr && 1881 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1882 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1883 IEEE80211_FCTL_TODS); 1884 /* RA TA DA SA */ 1885 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1886 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1887 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1888 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1889 hdrlen = 30; 1890 } else { 1891 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1892 /* BSSID SA DA */ 1893 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1894 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1895 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1896 hdrlen = 24; 1897 } 1898 break; 1899 case NL80211_IFTYPE_ADHOC: 1900 /* DA SA BSSID */ 1901 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1902 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1903 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1904 hdrlen = 24; 1905 break; 1906 default: 1907 ret = NETDEV_TX_OK; 1908 goto fail; 1909 } 1910 1911 /* 1912 * There's no need to try to look up the destination 1913 * if it is a multicast address (which can only happen 1914 * in AP mode) 1915 */ 1916 multicast = is_multicast_ether_addr(hdr.addr1); 1917 if (!multicast) { 1918 rcu_read_lock(); 1919 sta = sta_info_get(sdata, hdr.addr1); 1920 if (sta) { 1921 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1922 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1923 } 1924 rcu_read_unlock(); 1925 } 1926 1927 /* For mesh, the use of the QoS header is mandatory */ 1928 if (ieee80211_vif_is_mesh(&sdata->vif)) 1929 wme_sta = true; 1930 1931 /* receiver and we are QoS enabled, use a QoS type frame */ 1932 if (wme_sta && local->hw.queues >= 4) { 1933 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1934 hdrlen += 2; 1935 } 1936 1937 /* 1938 * Drop unicast frames to unauthorised stations unless they are 1939 * EAPOL frames from the local station. 1940 */ 1941 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1942 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1943 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1944 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1945 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1946 if (net_ratelimit()) 1947 printk(KERN_DEBUG "%s: dropped frame to %pM" 1948 " (unauthorized port)\n", dev->name, 1949 hdr.addr1); 1950 #endif 1951 1952 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1953 1954 ret = NETDEV_TX_OK; 1955 goto fail; 1956 } 1957 1958 if (unlikely(!multicast && skb->sk && 1959 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1960 struct sk_buff *orig_skb = skb; 1961 1962 skb = skb_clone(skb, GFP_ATOMIC); 1963 if (skb) { 1964 unsigned long flags; 1965 int id, r; 1966 1967 spin_lock_irqsave(&local->ack_status_lock, flags); 1968 r = idr_get_new_above(&local->ack_status_frames, 1969 orig_skb, 1, &id); 1970 if (r == -EAGAIN) { 1971 idr_pre_get(&local->ack_status_frames, 1972 GFP_ATOMIC); 1973 r = idr_get_new_above(&local->ack_status_frames, 1974 orig_skb, 1, &id); 1975 } 1976 if (WARN_ON(!id) || id > 0xffff) { 1977 idr_remove(&local->ack_status_frames, id); 1978 r = -ERANGE; 1979 } 1980 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1981 1982 if (!r) { 1983 info_id = id; 1984 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1985 } else if (skb_shared(skb)) { 1986 kfree_skb(orig_skb); 1987 } else { 1988 kfree_skb(skb); 1989 skb = orig_skb; 1990 } 1991 } else { 1992 /* couldn't clone -- lose tx status ... */ 1993 skb = orig_skb; 1994 } 1995 } 1996 1997 /* 1998 * If the skb is shared we need to obtain our own copy. 1999 */ 2000 if (skb_shared(skb)) { 2001 struct sk_buff *tmp_skb = skb; 2002 2003 /* can't happen -- skb is a clone if info_id != 0 */ 2004 WARN_ON(info_id); 2005 2006 skb = skb_clone(skb, GFP_ATOMIC); 2007 kfree_skb(tmp_skb); 2008 2009 if (!skb) { 2010 ret = NETDEV_TX_OK; 2011 goto fail; 2012 } 2013 } 2014 2015 hdr.frame_control = fc; 2016 hdr.duration_id = 0; 2017 hdr.seq_ctrl = 0; 2018 2019 skip_header_bytes = ETH_HLEN; 2020 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2021 encaps_data = bridge_tunnel_header; 2022 encaps_len = sizeof(bridge_tunnel_header); 2023 skip_header_bytes -= 2; 2024 } else if (ethertype >= 0x600) { 2025 encaps_data = rfc1042_header; 2026 encaps_len = sizeof(rfc1042_header); 2027 skip_header_bytes -= 2; 2028 } else { 2029 encaps_data = NULL; 2030 encaps_len = 0; 2031 } 2032 2033 nh_pos = skb_network_header(skb) - skb->data; 2034 h_pos = skb_transport_header(skb) - skb->data; 2035 2036 skb_pull(skb, skip_header_bytes); 2037 nh_pos -= skip_header_bytes; 2038 h_pos -= skip_header_bytes; 2039 2040 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2041 2042 /* 2043 * So we need to modify the skb header and hence need a copy of 2044 * that. The head_need variable above doesn't, so far, include 2045 * the needed header space that we don't need right away. If we 2046 * can, then we don't reallocate right now but only after the 2047 * frame arrives at the master device (if it does...) 2048 * 2049 * If we cannot, however, then we will reallocate to include all 2050 * the ever needed space. Also, if we need to reallocate it anyway, 2051 * make it big enough for everything we may ever need. 2052 */ 2053 2054 if (head_need > 0 || skb_cloned(skb)) { 2055 head_need += IEEE80211_ENCRYPT_HEADROOM; 2056 head_need += local->tx_headroom; 2057 head_need = max_t(int, 0, head_need); 2058 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 2059 goto fail; 2060 } 2061 2062 if (encaps_data) { 2063 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2064 nh_pos += encaps_len; 2065 h_pos += encaps_len; 2066 } 2067 2068 #ifdef CONFIG_MAC80211_MESH 2069 if (meshhdrlen > 0) { 2070 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2071 nh_pos += meshhdrlen; 2072 h_pos += meshhdrlen; 2073 } 2074 #endif 2075 2076 if (ieee80211_is_data_qos(fc)) { 2077 __le16 *qos_control; 2078 2079 qos_control = (__le16*) skb_push(skb, 2); 2080 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2081 /* 2082 * Maybe we could actually set some fields here, for now just 2083 * initialise to zero to indicate no special operation. 2084 */ 2085 *qos_control = 0; 2086 } else 2087 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2088 2089 nh_pos += hdrlen; 2090 h_pos += hdrlen; 2091 2092 dev->stats.tx_packets++; 2093 dev->stats.tx_bytes += skb->len; 2094 2095 /* Update skb pointers to various headers since this modified frame 2096 * is going to go through Linux networking code that may potentially 2097 * need things like pointer to IP header. */ 2098 skb_set_mac_header(skb, 0); 2099 skb_set_network_header(skb, nh_pos); 2100 skb_set_transport_header(skb, h_pos); 2101 2102 info = IEEE80211_SKB_CB(skb); 2103 memset(info, 0, sizeof(*info)); 2104 2105 dev->trans_start = jiffies; 2106 2107 info->flags = info_flags; 2108 info->ack_frame_id = info_id; 2109 2110 ieee80211_xmit(sdata, skb); 2111 2112 return NETDEV_TX_OK; 2113 2114 fail: 2115 if (ret == NETDEV_TX_OK) 2116 dev_kfree_skb(skb); 2117 2118 return ret; 2119 } 2120 2121 2122 /* 2123 * ieee80211_clear_tx_pending may not be called in a context where 2124 * it is possible that it packets could come in again. 2125 */ 2126 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2127 { 2128 int i; 2129 2130 for (i = 0; i < local->hw.queues; i++) 2131 skb_queue_purge(&local->pending[i]); 2132 } 2133 2134 /* 2135 * Returns false if the frame couldn't be transmitted but was queued instead, 2136 * which in this case means re-queued -- take as an indication to stop sending 2137 * more pending frames. 2138 */ 2139 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2140 struct sk_buff *skb) 2141 { 2142 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2143 struct ieee80211_sub_if_data *sdata; 2144 struct sta_info *sta; 2145 struct ieee80211_hdr *hdr; 2146 bool result; 2147 2148 sdata = vif_to_sdata(info->control.vif); 2149 2150 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2151 result = ieee80211_tx(sdata, skb, true); 2152 } else { 2153 struct sk_buff_head skbs; 2154 2155 __skb_queue_head_init(&skbs); 2156 __skb_queue_tail(&skbs, skb); 2157 2158 hdr = (struct ieee80211_hdr *)skb->data; 2159 sta = sta_info_get(sdata, hdr->addr1); 2160 2161 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2162 } 2163 2164 return result; 2165 } 2166 2167 /* 2168 * Transmit all pending packets. Called from tasklet. 2169 */ 2170 void ieee80211_tx_pending(unsigned long data) 2171 { 2172 struct ieee80211_local *local = (struct ieee80211_local *)data; 2173 struct ieee80211_sub_if_data *sdata; 2174 unsigned long flags; 2175 int i; 2176 bool txok; 2177 2178 rcu_read_lock(); 2179 2180 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2181 for (i = 0; i < local->hw.queues; i++) { 2182 /* 2183 * If queue is stopped by something other than due to pending 2184 * frames, or we have no pending frames, proceed to next queue. 2185 */ 2186 if (local->queue_stop_reasons[i] || 2187 skb_queue_empty(&local->pending[i])) 2188 continue; 2189 2190 while (!skb_queue_empty(&local->pending[i])) { 2191 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2192 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2193 2194 if (WARN_ON(!info->control.vif)) { 2195 kfree_skb(skb); 2196 continue; 2197 } 2198 2199 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2200 flags); 2201 2202 txok = ieee80211_tx_pending_skb(local, skb); 2203 spin_lock_irqsave(&local->queue_stop_reason_lock, 2204 flags); 2205 if (!txok) 2206 break; 2207 } 2208 2209 if (skb_queue_empty(&local->pending[i])) 2210 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2211 netif_wake_subqueue(sdata->dev, i); 2212 } 2213 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2214 2215 rcu_read_unlock(); 2216 } 2217 2218 /* functions for drivers to get certain frames */ 2219 2220 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2221 struct ieee80211_if_ap *bss, 2222 struct sk_buff *skb, 2223 struct beacon_data *beacon) 2224 { 2225 u8 *pos, *tim; 2226 int aid0 = 0; 2227 int i, have_bits = 0, n1, n2; 2228 2229 /* Generate bitmap for TIM only if there are any STAs in power save 2230 * mode. */ 2231 if (atomic_read(&bss->num_sta_ps) > 0) 2232 /* in the hope that this is faster than 2233 * checking byte-for-byte */ 2234 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2235 IEEE80211_MAX_AID+1); 2236 2237 if (bss->dtim_count == 0) 2238 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2239 else 2240 bss->dtim_count--; 2241 2242 tim = pos = (u8 *) skb_put(skb, 6); 2243 *pos++ = WLAN_EID_TIM; 2244 *pos++ = 4; 2245 *pos++ = bss->dtim_count; 2246 *pos++ = sdata->vif.bss_conf.dtim_period; 2247 2248 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2249 aid0 = 1; 2250 2251 bss->dtim_bc_mc = aid0 == 1; 2252 2253 if (have_bits) { 2254 /* Find largest even number N1 so that bits numbered 1 through 2255 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2256 * (N2 + 1) x 8 through 2007 are 0. */ 2257 n1 = 0; 2258 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2259 if (bss->tim[i]) { 2260 n1 = i & 0xfe; 2261 break; 2262 } 2263 } 2264 n2 = n1; 2265 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2266 if (bss->tim[i]) { 2267 n2 = i; 2268 break; 2269 } 2270 } 2271 2272 /* Bitmap control */ 2273 *pos++ = n1 | aid0; 2274 /* Part Virt Bitmap */ 2275 skb_put(skb, n2 - n1); 2276 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2277 2278 tim[1] = n2 - n1 + 4; 2279 } else { 2280 *pos++ = aid0; /* Bitmap control */ 2281 *pos++ = 0; /* Part Virt Bitmap */ 2282 } 2283 } 2284 2285 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2286 struct ieee80211_vif *vif, 2287 u16 *tim_offset, u16 *tim_length) 2288 { 2289 struct ieee80211_local *local = hw_to_local(hw); 2290 struct sk_buff *skb = NULL; 2291 struct ieee80211_tx_info *info; 2292 struct ieee80211_sub_if_data *sdata = NULL; 2293 struct ieee80211_if_ap *ap = NULL; 2294 struct beacon_data *beacon; 2295 struct ieee80211_supported_band *sband; 2296 enum ieee80211_band band = local->hw.conf.channel->band; 2297 struct ieee80211_tx_rate_control txrc; 2298 2299 sband = local->hw.wiphy->bands[band]; 2300 2301 rcu_read_lock(); 2302 2303 sdata = vif_to_sdata(vif); 2304 2305 if (!ieee80211_sdata_running(sdata)) 2306 goto out; 2307 2308 if (tim_offset) 2309 *tim_offset = 0; 2310 if (tim_length) 2311 *tim_length = 0; 2312 2313 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2314 ap = &sdata->u.ap; 2315 beacon = rcu_dereference(ap->beacon); 2316 if (beacon) { 2317 /* 2318 * headroom, head length, 2319 * tail length and maximum TIM length 2320 */ 2321 skb = dev_alloc_skb(local->tx_headroom + 2322 beacon->head_len + 2323 beacon->tail_len + 256); 2324 if (!skb) 2325 goto out; 2326 2327 skb_reserve(skb, local->tx_headroom); 2328 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2329 beacon->head_len); 2330 2331 /* 2332 * Not very nice, but we want to allow the driver to call 2333 * ieee80211_beacon_get() as a response to the set_tim() 2334 * callback. That, however, is already invoked under the 2335 * sta_lock to guarantee consistent and race-free update 2336 * of the tim bitmap in mac80211 and the driver. 2337 */ 2338 if (local->tim_in_locked_section) { 2339 ieee80211_beacon_add_tim(sdata, ap, skb, 2340 beacon); 2341 } else { 2342 unsigned long flags; 2343 2344 spin_lock_irqsave(&local->tim_lock, flags); 2345 ieee80211_beacon_add_tim(sdata, ap, skb, 2346 beacon); 2347 spin_unlock_irqrestore(&local->tim_lock, flags); 2348 } 2349 2350 if (tim_offset) 2351 *tim_offset = beacon->head_len; 2352 if (tim_length) 2353 *tim_length = skb->len - beacon->head_len; 2354 2355 if (beacon->tail) 2356 memcpy(skb_put(skb, beacon->tail_len), 2357 beacon->tail, beacon->tail_len); 2358 } else 2359 goto out; 2360 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2361 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2362 struct ieee80211_hdr *hdr; 2363 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2364 2365 if (!presp) 2366 goto out; 2367 2368 skb = skb_copy(presp, GFP_ATOMIC); 2369 if (!skb) 2370 goto out; 2371 2372 hdr = (struct ieee80211_hdr *) skb->data; 2373 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2374 IEEE80211_STYPE_BEACON); 2375 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2376 struct ieee80211_mgmt *mgmt; 2377 u8 *pos; 2378 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2379 sizeof(mgmt->u.beacon); 2380 2381 #ifdef CONFIG_MAC80211_MESH 2382 if (!sdata->u.mesh.mesh_id_len) 2383 goto out; 2384 #endif 2385 2386 skb = dev_alloc_skb(local->tx_headroom + 2387 hdr_len + 2388 2 + /* NULL SSID */ 2389 2 + 8 + /* supported rates */ 2390 2 + 3 + /* DS params */ 2391 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2392 2 + sizeof(struct ieee80211_ht_cap) + 2393 2 + sizeof(struct ieee80211_ht_info) + 2394 2 + sdata->u.mesh.mesh_id_len + 2395 2 + sizeof(struct ieee80211_meshconf_ie) + 2396 sdata->u.mesh.ie_len); 2397 if (!skb) 2398 goto out; 2399 2400 skb_reserve(skb, local->hw.extra_tx_headroom); 2401 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2402 memset(mgmt, 0, hdr_len); 2403 mgmt->frame_control = 2404 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2405 memset(mgmt->da, 0xff, ETH_ALEN); 2406 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2407 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2408 mgmt->u.beacon.beacon_int = 2409 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2410 mgmt->u.beacon.capab_info |= cpu_to_le16( 2411 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2412 2413 pos = skb_put(skb, 2); 2414 *pos++ = WLAN_EID_SSID; 2415 *pos++ = 0x0; 2416 2417 if (ieee80211_add_srates_ie(&sdata->vif, skb) || 2418 mesh_add_ds_params_ie(skb, sdata) || 2419 ieee80211_add_ext_srates_ie(&sdata->vif, skb) || 2420 mesh_add_rsn_ie(skb, sdata) || 2421 mesh_add_ht_cap_ie(skb, sdata) || 2422 mesh_add_ht_info_ie(skb, sdata) || 2423 mesh_add_meshid_ie(skb, sdata) || 2424 mesh_add_meshconf_ie(skb, sdata) || 2425 mesh_add_vendor_ies(skb, sdata)) { 2426 pr_err("o11s: couldn't add ies!\n"); 2427 goto out; 2428 } 2429 } else { 2430 WARN_ON(1); 2431 goto out; 2432 } 2433 2434 info = IEEE80211_SKB_CB(skb); 2435 2436 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2437 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2438 info->band = band; 2439 2440 memset(&txrc, 0, sizeof(txrc)); 2441 txrc.hw = hw; 2442 txrc.sband = sband; 2443 txrc.bss_conf = &sdata->vif.bss_conf; 2444 txrc.skb = skb; 2445 txrc.reported_rate.idx = -1; 2446 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2447 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2448 txrc.max_rate_idx = -1; 2449 else 2450 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2451 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2452 sizeof(txrc.rate_idx_mcs_mask)); 2453 txrc.bss = true; 2454 rate_control_get_rate(sdata, NULL, &txrc); 2455 2456 info->control.vif = vif; 2457 2458 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2459 IEEE80211_TX_CTL_ASSIGN_SEQ | 2460 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2461 out: 2462 rcu_read_unlock(); 2463 return skb; 2464 } 2465 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2466 2467 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2468 struct ieee80211_vif *vif) 2469 { 2470 struct ieee80211_if_ap *ap = NULL; 2471 struct sk_buff *presp = NULL, *skb = NULL; 2472 struct ieee80211_hdr *hdr; 2473 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2474 2475 if (sdata->vif.type != NL80211_IFTYPE_AP) 2476 return NULL; 2477 2478 rcu_read_lock(); 2479 2480 ap = &sdata->u.ap; 2481 presp = rcu_dereference(ap->probe_resp); 2482 if (!presp) 2483 goto out; 2484 2485 skb = skb_copy(presp, GFP_ATOMIC); 2486 if (!skb) 2487 goto out; 2488 2489 hdr = (struct ieee80211_hdr *) skb->data; 2490 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2491 2492 out: 2493 rcu_read_unlock(); 2494 return skb; 2495 } 2496 EXPORT_SYMBOL(ieee80211_proberesp_get); 2497 2498 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2499 struct ieee80211_vif *vif) 2500 { 2501 struct ieee80211_sub_if_data *sdata; 2502 struct ieee80211_if_managed *ifmgd; 2503 struct ieee80211_pspoll *pspoll; 2504 struct ieee80211_local *local; 2505 struct sk_buff *skb; 2506 2507 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2508 return NULL; 2509 2510 sdata = vif_to_sdata(vif); 2511 ifmgd = &sdata->u.mgd; 2512 local = sdata->local; 2513 2514 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2515 if (!skb) 2516 return NULL; 2517 2518 skb_reserve(skb, local->hw.extra_tx_headroom); 2519 2520 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2521 memset(pspoll, 0, sizeof(*pspoll)); 2522 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2523 IEEE80211_STYPE_PSPOLL); 2524 pspoll->aid = cpu_to_le16(ifmgd->aid); 2525 2526 /* aid in PS-Poll has its two MSBs each set to 1 */ 2527 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2528 2529 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2530 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2531 2532 return skb; 2533 } 2534 EXPORT_SYMBOL(ieee80211_pspoll_get); 2535 2536 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2537 struct ieee80211_vif *vif) 2538 { 2539 struct ieee80211_hdr_3addr *nullfunc; 2540 struct ieee80211_sub_if_data *sdata; 2541 struct ieee80211_if_managed *ifmgd; 2542 struct ieee80211_local *local; 2543 struct sk_buff *skb; 2544 2545 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2546 return NULL; 2547 2548 sdata = vif_to_sdata(vif); 2549 ifmgd = &sdata->u.mgd; 2550 local = sdata->local; 2551 2552 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2553 if (!skb) 2554 return NULL; 2555 2556 skb_reserve(skb, local->hw.extra_tx_headroom); 2557 2558 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2559 sizeof(*nullfunc)); 2560 memset(nullfunc, 0, sizeof(*nullfunc)); 2561 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2562 IEEE80211_STYPE_NULLFUNC | 2563 IEEE80211_FCTL_TODS); 2564 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2565 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2566 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2567 2568 return skb; 2569 } 2570 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2571 2572 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2573 struct ieee80211_vif *vif, 2574 const u8 *ssid, size_t ssid_len, 2575 const u8 *ie, size_t ie_len) 2576 { 2577 struct ieee80211_sub_if_data *sdata; 2578 struct ieee80211_local *local; 2579 struct ieee80211_hdr_3addr *hdr; 2580 struct sk_buff *skb; 2581 size_t ie_ssid_len; 2582 u8 *pos; 2583 2584 sdata = vif_to_sdata(vif); 2585 local = sdata->local; 2586 ie_ssid_len = 2 + ssid_len; 2587 2588 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2589 ie_ssid_len + ie_len); 2590 if (!skb) 2591 return NULL; 2592 2593 skb_reserve(skb, local->hw.extra_tx_headroom); 2594 2595 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2596 memset(hdr, 0, sizeof(*hdr)); 2597 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2598 IEEE80211_STYPE_PROBE_REQ); 2599 memset(hdr->addr1, 0xff, ETH_ALEN); 2600 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2601 memset(hdr->addr3, 0xff, ETH_ALEN); 2602 2603 pos = skb_put(skb, ie_ssid_len); 2604 *pos++ = WLAN_EID_SSID; 2605 *pos++ = ssid_len; 2606 if (ssid) 2607 memcpy(pos, ssid, ssid_len); 2608 pos += ssid_len; 2609 2610 if (ie) { 2611 pos = skb_put(skb, ie_len); 2612 memcpy(pos, ie, ie_len); 2613 } 2614 2615 return skb; 2616 } 2617 EXPORT_SYMBOL(ieee80211_probereq_get); 2618 2619 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2620 const void *frame, size_t frame_len, 2621 const struct ieee80211_tx_info *frame_txctl, 2622 struct ieee80211_rts *rts) 2623 { 2624 const struct ieee80211_hdr *hdr = frame; 2625 2626 rts->frame_control = 2627 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2628 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2629 frame_txctl); 2630 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2631 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2632 } 2633 EXPORT_SYMBOL(ieee80211_rts_get); 2634 2635 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2636 const void *frame, size_t frame_len, 2637 const struct ieee80211_tx_info *frame_txctl, 2638 struct ieee80211_cts *cts) 2639 { 2640 const struct ieee80211_hdr *hdr = frame; 2641 2642 cts->frame_control = 2643 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2644 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2645 frame_len, frame_txctl); 2646 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2647 } 2648 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2649 2650 struct sk_buff * 2651 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2652 struct ieee80211_vif *vif) 2653 { 2654 struct ieee80211_local *local = hw_to_local(hw); 2655 struct sk_buff *skb = NULL; 2656 struct ieee80211_tx_data tx; 2657 struct ieee80211_sub_if_data *sdata; 2658 struct ieee80211_if_ap *bss = NULL; 2659 struct beacon_data *beacon; 2660 struct ieee80211_tx_info *info; 2661 2662 sdata = vif_to_sdata(vif); 2663 bss = &sdata->u.ap; 2664 2665 rcu_read_lock(); 2666 beacon = rcu_dereference(bss->beacon); 2667 2668 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2669 goto out; 2670 2671 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2672 goto out; /* send buffered bc/mc only after DTIM beacon */ 2673 2674 while (1) { 2675 skb = skb_dequeue(&bss->ps_bc_buf); 2676 if (!skb) 2677 goto out; 2678 local->total_ps_buffered--; 2679 2680 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2681 struct ieee80211_hdr *hdr = 2682 (struct ieee80211_hdr *) skb->data; 2683 /* more buffered multicast/broadcast frames ==> set 2684 * MoreData flag in IEEE 802.11 header to inform PS 2685 * STAs */ 2686 hdr->frame_control |= 2687 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2688 } 2689 2690 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2691 break; 2692 dev_kfree_skb_any(skb); 2693 } 2694 2695 info = IEEE80211_SKB_CB(skb); 2696 2697 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2698 tx.channel = local->hw.conf.channel; 2699 info->band = tx.channel->band; 2700 2701 if (invoke_tx_handlers(&tx)) 2702 skb = NULL; 2703 out: 2704 rcu_read_unlock(); 2705 2706 return skb; 2707 } 2708 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2709 2710 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2711 struct sk_buff *skb, int tid) 2712 { 2713 skb_set_mac_header(skb, 0); 2714 skb_set_network_header(skb, 0); 2715 skb_set_transport_header(skb, 0); 2716 2717 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 2718 skb->priority = tid; 2719 2720 /* 2721 * The other path calling ieee80211_xmit is from the tasklet, 2722 * and while we can handle concurrent transmissions locking 2723 * requirements are that we do not come into tx with bhs on. 2724 */ 2725 local_bh_disable(); 2726 ieee80211_xmit(sdata, skb); 2727 local_bh_enable(); 2728 } 2729