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->sdata->control_port_protocol == tx->skb->protocol) { 1163 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1164 } 1165 if (!tx->sta) 1166 tx->sta = sta_info_get(sdata, hdr->addr1); 1167 1168 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1169 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1170 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1171 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1172 struct tid_ampdu_tx *tid_tx; 1173 1174 qc = ieee80211_get_qos_ctl(hdr); 1175 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1176 1177 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1178 if (tid_tx) { 1179 bool queued; 1180 1181 queued = ieee80211_tx_prep_agg(tx, skb, info, 1182 tid_tx, tid); 1183 1184 if (unlikely(queued)) 1185 return TX_QUEUED; 1186 } 1187 } 1188 1189 if (is_multicast_ether_addr(hdr->addr1)) { 1190 tx->flags &= ~IEEE80211_TX_UNICAST; 1191 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1192 } else 1193 tx->flags |= IEEE80211_TX_UNICAST; 1194 1195 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1196 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1197 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1198 info->flags & IEEE80211_TX_CTL_AMPDU) 1199 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1200 } 1201 1202 if (!tx->sta) 1203 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1204 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1205 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1206 1207 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1208 1209 return TX_CONTINUE; 1210 } 1211 1212 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1213 struct ieee80211_vif *vif, 1214 struct ieee80211_sta *sta, 1215 struct sk_buff_head *skbs, 1216 bool txpending) 1217 { 1218 struct sk_buff *skb, *tmp; 1219 struct ieee80211_tx_info *info; 1220 unsigned long flags; 1221 1222 skb_queue_walk_safe(skbs, skb, tmp) { 1223 int q = skb_get_queue_mapping(skb); 1224 1225 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1226 if (local->queue_stop_reasons[q] || 1227 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1228 /* 1229 * Since queue is stopped, queue up frames for later 1230 * transmission from the tx-pending tasklet when the 1231 * queue is woken again. 1232 */ 1233 if (txpending) 1234 skb_queue_splice_init(skbs, &local->pending[q]); 1235 else 1236 skb_queue_splice_tail_init(skbs, 1237 &local->pending[q]); 1238 1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1240 flags); 1241 return false; 1242 } 1243 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1244 1245 info = IEEE80211_SKB_CB(skb); 1246 info->control.vif = vif; 1247 info->control.sta = sta; 1248 1249 __skb_unlink(skb, skbs); 1250 drv_tx(local, skb); 1251 } 1252 1253 return true; 1254 } 1255 1256 /* 1257 * Returns false if the frame couldn't be transmitted but was queued instead. 1258 */ 1259 static bool __ieee80211_tx(struct ieee80211_local *local, 1260 struct sk_buff_head *skbs, int led_len, 1261 struct sta_info *sta, bool txpending) 1262 { 1263 struct ieee80211_tx_info *info; 1264 struct ieee80211_sub_if_data *sdata; 1265 struct ieee80211_vif *vif; 1266 struct ieee80211_sta *pubsta; 1267 struct sk_buff *skb; 1268 bool result = true; 1269 __le16 fc; 1270 1271 if (WARN_ON(skb_queue_empty(skbs))) 1272 return true; 1273 1274 skb = skb_peek(skbs); 1275 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1276 info = IEEE80211_SKB_CB(skb); 1277 sdata = vif_to_sdata(info->control.vif); 1278 if (sta && !sta->uploaded) 1279 sta = NULL; 1280 1281 if (sta) 1282 pubsta = &sta->sta; 1283 else 1284 pubsta = NULL; 1285 1286 switch (sdata->vif.type) { 1287 case NL80211_IFTYPE_MONITOR: 1288 sdata = NULL; 1289 vif = NULL; 1290 break; 1291 case NL80211_IFTYPE_AP_VLAN: 1292 sdata = container_of(sdata->bss, 1293 struct ieee80211_sub_if_data, u.ap); 1294 /* fall through */ 1295 default: 1296 vif = &sdata->vif; 1297 break; 1298 } 1299 1300 if (local->ops->tx_frags) 1301 drv_tx_frags(local, vif, pubsta, skbs); 1302 else 1303 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1304 txpending); 1305 1306 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1307 ieee80211_led_tx(local, 1); 1308 1309 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1310 1311 return result; 1312 } 1313 1314 /* 1315 * Invoke TX handlers, return 0 on success and non-zero if the 1316 * frame was dropped or queued. 1317 */ 1318 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1319 { 1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1321 ieee80211_tx_result res = TX_DROP; 1322 1323 #define CALL_TXH(txh) \ 1324 do { \ 1325 res = txh(tx); \ 1326 if (res != TX_CONTINUE) \ 1327 goto txh_done; \ 1328 } while (0) 1329 1330 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1331 CALL_TXH(ieee80211_tx_h_check_assoc); 1332 CALL_TXH(ieee80211_tx_h_ps_buf); 1333 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1334 CALL_TXH(ieee80211_tx_h_select_key); 1335 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1336 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1337 1338 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1339 __skb_queue_tail(&tx->skbs, tx->skb); 1340 tx->skb = NULL; 1341 goto txh_done; 1342 } 1343 1344 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1345 CALL_TXH(ieee80211_tx_h_sequence); 1346 CALL_TXH(ieee80211_tx_h_fragment); 1347 /* handlers after fragment must be aware of tx info fragmentation! */ 1348 CALL_TXH(ieee80211_tx_h_stats); 1349 CALL_TXH(ieee80211_tx_h_encrypt); 1350 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1351 CALL_TXH(ieee80211_tx_h_calculate_duration); 1352 #undef CALL_TXH 1353 1354 txh_done: 1355 if (unlikely(res == TX_DROP)) { 1356 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1357 if (tx->skb) 1358 dev_kfree_skb(tx->skb); 1359 else 1360 __skb_queue_purge(&tx->skbs); 1361 return -1; 1362 } else if (unlikely(res == TX_QUEUED)) { 1363 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1364 return -1; 1365 } 1366 1367 return 0; 1368 } 1369 1370 /* 1371 * Returns false if the frame couldn't be transmitted but was queued instead. 1372 */ 1373 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1374 struct sk_buff *skb, bool txpending) 1375 { 1376 struct ieee80211_local *local = sdata->local; 1377 struct ieee80211_tx_data tx; 1378 ieee80211_tx_result res_prepare; 1379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1380 bool result = true; 1381 int led_len; 1382 1383 if (unlikely(skb->len < 10)) { 1384 dev_kfree_skb(skb); 1385 return true; 1386 } 1387 1388 rcu_read_lock(); 1389 1390 /* initialises tx */ 1391 led_len = skb->len; 1392 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1393 1394 if (unlikely(res_prepare == TX_DROP)) { 1395 dev_kfree_skb(skb); 1396 goto out; 1397 } else if (unlikely(res_prepare == TX_QUEUED)) { 1398 goto out; 1399 } 1400 1401 tx.channel = local->hw.conf.channel; 1402 info->band = tx.channel->band; 1403 1404 if (!invoke_tx_handlers(&tx)) 1405 result = __ieee80211_tx(local, &tx.skbs, led_len, 1406 tx.sta, txpending); 1407 out: 1408 rcu_read_unlock(); 1409 return result; 1410 } 1411 1412 /* device xmit handlers */ 1413 1414 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1415 struct sk_buff *skb, 1416 int head_need, bool may_encrypt) 1417 { 1418 struct ieee80211_local *local = sdata->local; 1419 int tail_need = 0; 1420 1421 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1422 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1423 tail_need -= skb_tailroom(skb); 1424 tail_need = max_t(int, tail_need, 0); 1425 } 1426 1427 if (skb_cloned(skb)) 1428 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1429 else if (head_need || tail_need) 1430 I802_DEBUG_INC(local->tx_expand_skb_head); 1431 else 1432 return 0; 1433 1434 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1435 wiphy_debug(local->hw.wiphy, 1436 "failed to reallocate TX buffer\n"); 1437 return -ENOMEM; 1438 } 1439 1440 return 0; 1441 } 1442 1443 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1444 { 1445 struct ieee80211_local *local = sdata->local; 1446 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1447 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1448 int headroom; 1449 bool may_encrypt; 1450 1451 rcu_read_lock(); 1452 1453 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1454 1455 headroom = local->tx_headroom; 1456 if (may_encrypt) 1457 headroom += IEEE80211_ENCRYPT_HEADROOM; 1458 headroom -= skb_headroom(skb); 1459 headroom = max_t(int, 0, headroom); 1460 1461 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1462 dev_kfree_skb(skb); 1463 rcu_read_unlock(); 1464 return; 1465 } 1466 1467 hdr = (struct ieee80211_hdr *) skb->data; 1468 info->control.vif = &sdata->vif; 1469 1470 if (ieee80211_vif_is_mesh(&sdata->vif) && 1471 ieee80211_is_data(hdr->frame_control) && 1472 !is_multicast_ether_addr(hdr->addr1)) 1473 if (mesh_nexthop_resolve(skb, sdata)) { 1474 /* skb queued: don't free */ 1475 rcu_read_unlock(); 1476 return; 1477 } 1478 1479 ieee80211_set_qos_hdr(sdata, skb); 1480 ieee80211_tx(sdata, skb, false); 1481 rcu_read_unlock(); 1482 } 1483 1484 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1485 { 1486 struct ieee80211_radiotap_iterator iterator; 1487 struct ieee80211_radiotap_header *rthdr = 1488 (struct ieee80211_radiotap_header *) skb->data; 1489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1490 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1491 NULL); 1492 u16 txflags; 1493 1494 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1495 IEEE80211_TX_CTL_DONTFRAG; 1496 1497 /* 1498 * for every radiotap entry that is present 1499 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1500 * entries present, or -EINVAL on error) 1501 */ 1502 1503 while (!ret) { 1504 ret = ieee80211_radiotap_iterator_next(&iterator); 1505 1506 if (ret) 1507 continue; 1508 1509 /* see if this argument is something we can use */ 1510 switch (iterator.this_arg_index) { 1511 /* 1512 * You must take care when dereferencing iterator.this_arg 1513 * for multibyte types... the pointer is not aligned. Use 1514 * get_unaligned((type *)iterator.this_arg) to dereference 1515 * iterator.this_arg for type "type" safely on all arches. 1516 */ 1517 case IEEE80211_RADIOTAP_FLAGS: 1518 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1519 /* 1520 * this indicates that the skb we have been 1521 * handed has the 32-bit FCS CRC at the end... 1522 * we should react to that by snipping it off 1523 * because it will be recomputed and added 1524 * on transmission 1525 */ 1526 if (skb->len < (iterator._max_length + FCS_LEN)) 1527 return false; 1528 1529 skb_trim(skb, skb->len - FCS_LEN); 1530 } 1531 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1532 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1533 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1534 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1535 break; 1536 1537 case IEEE80211_RADIOTAP_TX_FLAGS: 1538 txflags = get_unaligned_le16(iterator.this_arg); 1539 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1540 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1541 break; 1542 1543 /* 1544 * Please update the file 1545 * Documentation/networking/mac80211-injection.txt 1546 * when parsing new fields here. 1547 */ 1548 1549 default: 1550 break; 1551 } 1552 } 1553 1554 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1555 return false; 1556 1557 /* 1558 * remove the radiotap header 1559 * iterator->_max_length was sanity-checked against 1560 * skb->len by iterator init 1561 */ 1562 skb_pull(skb, iterator._max_length); 1563 1564 return true; 1565 } 1566 1567 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1568 struct net_device *dev) 1569 { 1570 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1571 struct ieee80211_channel *chan = local->hw.conf.channel; 1572 struct ieee80211_radiotap_header *prthdr = 1573 (struct ieee80211_radiotap_header *)skb->data; 1574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1575 struct ieee80211_hdr *hdr; 1576 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1577 u16 len_rthdr; 1578 int hdrlen; 1579 1580 /* 1581 * Frame injection is not allowed if beaconing is not allowed 1582 * or if we need radar detection. Beaconing is usually not allowed when 1583 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1584 * Passive scan is also used in world regulatory domains where 1585 * your country is not known and as such it should be treated as 1586 * NO TX unless the channel is explicitly allowed in which case 1587 * your current regulatory domain would not have the passive scan 1588 * flag. 1589 * 1590 * Since AP mode uses monitor interfaces to inject/TX management 1591 * frames we can make AP mode the exception to this rule once it 1592 * supports radar detection as its implementation can deal with 1593 * radar detection by itself. We can do that later by adding a 1594 * monitor flag interfaces used for AP support. 1595 */ 1596 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1597 IEEE80211_CHAN_PASSIVE_SCAN))) 1598 goto fail; 1599 1600 /* check for not even having the fixed radiotap header part */ 1601 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1602 goto fail; /* too short to be possibly valid */ 1603 1604 /* is it a header version we can trust to find length from? */ 1605 if (unlikely(prthdr->it_version)) 1606 goto fail; /* only version 0 is supported */ 1607 1608 /* then there must be a radiotap header with a length we can use */ 1609 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1610 1611 /* does the skb contain enough to deliver on the alleged length? */ 1612 if (unlikely(skb->len < len_rthdr)) 1613 goto fail; /* skb too short for claimed rt header extent */ 1614 1615 /* 1616 * fix up the pointers accounting for the radiotap 1617 * header still being in there. We are being given 1618 * a precooked IEEE80211 header so no need for 1619 * normal processing 1620 */ 1621 skb_set_mac_header(skb, len_rthdr); 1622 /* 1623 * these are just fixed to the end of the rt area since we 1624 * don't have any better information and at this point, nobody cares 1625 */ 1626 skb_set_network_header(skb, len_rthdr); 1627 skb_set_transport_header(skb, len_rthdr); 1628 1629 if (skb->len < len_rthdr + 2) 1630 goto fail; 1631 1632 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1633 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1634 1635 if (skb->len < len_rthdr + hdrlen) 1636 goto fail; 1637 1638 /* 1639 * Initialize skb->protocol if the injected frame is a data frame 1640 * carrying a rfc1042 header 1641 */ 1642 if (ieee80211_is_data(hdr->frame_control) && 1643 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1644 u8 *payload = (u8 *)hdr + hdrlen; 1645 1646 if (compare_ether_addr(payload, rfc1042_header) == 0) 1647 skb->protocol = cpu_to_be16((payload[6] << 8) | 1648 payload[7]); 1649 } 1650 1651 memset(info, 0, sizeof(*info)); 1652 1653 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1654 IEEE80211_TX_CTL_INJECTED; 1655 1656 /* process and remove the injection radiotap header */ 1657 if (!ieee80211_parse_tx_radiotap(skb)) 1658 goto fail; 1659 1660 rcu_read_lock(); 1661 1662 /* 1663 * We process outgoing injected frames that have a local address 1664 * we handle as though they are non-injected frames. 1665 * This code here isn't entirely correct, the local MAC address 1666 * isn't always enough to find the interface to use; for proper 1667 * VLAN/WDS support we will need a different mechanism (which 1668 * likely isn't going to be monitor interfaces). 1669 */ 1670 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1671 1672 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1673 if (!ieee80211_sdata_running(tmp_sdata)) 1674 continue; 1675 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1676 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1677 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1678 continue; 1679 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { 1680 sdata = tmp_sdata; 1681 break; 1682 } 1683 } 1684 1685 ieee80211_xmit(sdata, skb); 1686 rcu_read_unlock(); 1687 1688 return NETDEV_TX_OK; 1689 1690 fail: 1691 dev_kfree_skb(skb); 1692 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1693 } 1694 1695 /** 1696 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1697 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1698 * @skb: packet to be sent 1699 * @dev: incoming interface 1700 * 1701 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1702 * not be freed, and caller is responsible for either retrying later or freeing 1703 * skb). 1704 * 1705 * This function takes in an Ethernet header and encapsulates it with suitable 1706 * IEEE 802.11 header based on which interface the packet is coming in. The 1707 * encapsulated packet will then be passed to master interface, wlan#.11, for 1708 * transmission (through low-level driver). 1709 */ 1710 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1711 struct net_device *dev) 1712 { 1713 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1714 struct ieee80211_local *local = sdata->local; 1715 struct ieee80211_tx_info *info; 1716 int ret = NETDEV_TX_BUSY, head_need; 1717 u16 ethertype, hdrlen, meshhdrlen = 0; 1718 __le16 fc; 1719 struct ieee80211_hdr hdr; 1720 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1721 struct mesh_path __maybe_unused *mppath = NULL; 1722 const u8 *encaps_data; 1723 int encaps_len, skip_header_bytes; 1724 int nh_pos, h_pos; 1725 struct sta_info *sta = NULL; 1726 bool wme_sta = false, authorized = false, tdls_auth = false; 1727 bool tdls_direct = false; 1728 bool multicast; 1729 u32 info_flags = 0; 1730 u16 info_id = 0; 1731 1732 if (unlikely(skb->len < ETH_HLEN)) { 1733 ret = NETDEV_TX_OK; 1734 goto fail; 1735 } 1736 1737 /* convert Ethernet header to proper 802.11 header (based on 1738 * operation mode) */ 1739 ethertype = (skb->data[12] << 8) | skb->data[13]; 1740 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1741 1742 switch (sdata->vif.type) { 1743 case NL80211_IFTYPE_AP_VLAN: 1744 rcu_read_lock(); 1745 sta = rcu_dereference(sdata->u.vlan.sta); 1746 if (sta) { 1747 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1748 /* RA TA DA SA */ 1749 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1750 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1751 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1752 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1753 hdrlen = 30; 1754 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1755 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1756 } 1757 rcu_read_unlock(); 1758 if (sta) 1759 break; 1760 /* fall through */ 1761 case NL80211_IFTYPE_AP: 1762 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1763 /* DA BSSID SA */ 1764 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1765 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1766 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1767 hdrlen = 24; 1768 break; 1769 case NL80211_IFTYPE_WDS: 1770 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1771 /* RA TA DA SA */ 1772 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1773 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1774 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1775 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1776 hdrlen = 30; 1777 break; 1778 #ifdef CONFIG_MAC80211_MESH 1779 case NL80211_IFTYPE_MESH_POINT: 1780 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1781 /* Do not send frames with mesh_ttl == 0 */ 1782 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1783 ret = NETDEV_TX_OK; 1784 goto fail; 1785 } 1786 rcu_read_lock(); 1787 if (!is_multicast_ether_addr(skb->data)) 1788 mppath = mpp_path_lookup(skb->data, sdata); 1789 1790 /* 1791 * Use address extension if it is a packet from 1792 * another interface or if we know the destination 1793 * is being proxied by a portal (i.e. portal address 1794 * differs from proxied address) 1795 */ 1796 if (compare_ether_addr(sdata->vif.addr, 1797 skb->data + ETH_ALEN) == 0 && 1798 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { 1799 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1800 skb->data, skb->data + ETH_ALEN); 1801 rcu_read_unlock(); 1802 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1803 sdata, NULL, NULL); 1804 } else { 1805 int is_mesh_mcast = 1; 1806 const u8 *mesh_da; 1807 1808 if (is_multicast_ether_addr(skb->data)) 1809 /* DA TA mSA AE:SA */ 1810 mesh_da = skb->data; 1811 else { 1812 static const u8 bcast[ETH_ALEN] = 1813 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1814 if (mppath) { 1815 /* RA TA mDA mSA AE:DA SA */ 1816 mesh_da = mppath->mpp; 1817 is_mesh_mcast = 0; 1818 } else { 1819 /* DA TA mSA AE:SA */ 1820 mesh_da = bcast; 1821 } 1822 } 1823 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1824 mesh_da, sdata->vif.addr); 1825 rcu_read_unlock(); 1826 if (is_mesh_mcast) 1827 meshhdrlen = 1828 ieee80211_new_mesh_header(&mesh_hdr, 1829 sdata, 1830 skb->data + ETH_ALEN, 1831 NULL); 1832 else 1833 meshhdrlen = 1834 ieee80211_new_mesh_header(&mesh_hdr, 1835 sdata, 1836 skb->data, 1837 skb->data + ETH_ALEN); 1838 1839 } 1840 break; 1841 #endif 1842 case NL80211_IFTYPE_STATION: 1843 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1844 bool tdls_peer = false; 1845 1846 rcu_read_lock(); 1847 sta = sta_info_get(sdata, skb->data); 1848 if (sta) { 1849 authorized = test_sta_flag(sta, 1850 WLAN_STA_AUTHORIZED); 1851 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1852 tdls_peer = test_sta_flag(sta, 1853 WLAN_STA_TDLS_PEER); 1854 tdls_auth = test_sta_flag(sta, 1855 WLAN_STA_TDLS_PEER_AUTH); 1856 } 1857 rcu_read_unlock(); 1858 1859 /* 1860 * If the TDLS link is enabled, send everything 1861 * directly. Otherwise, allow TDLS setup frames 1862 * to be transmitted indirectly. 1863 */ 1864 tdls_direct = tdls_peer && (tdls_auth || 1865 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1866 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1867 } 1868 1869 if (tdls_direct) { 1870 /* link during setup - throw out frames to peer */ 1871 if (!tdls_auth) { 1872 ret = NETDEV_TX_OK; 1873 goto fail; 1874 } 1875 1876 /* DA SA BSSID */ 1877 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1878 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1879 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1880 hdrlen = 24; 1881 } else if (sdata->u.mgd.use_4addr && 1882 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1883 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1884 IEEE80211_FCTL_TODS); 1885 /* RA TA DA SA */ 1886 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1887 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1888 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1889 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1890 hdrlen = 30; 1891 } else { 1892 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1893 /* BSSID SA DA */ 1894 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1895 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1896 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1897 hdrlen = 24; 1898 } 1899 break; 1900 case NL80211_IFTYPE_ADHOC: 1901 /* DA SA BSSID */ 1902 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1903 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1904 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1905 hdrlen = 24; 1906 break; 1907 default: 1908 ret = NETDEV_TX_OK; 1909 goto fail; 1910 } 1911 1912 /* 1913 * There's no need to try to look up the destination 1914 * if it is a multicast address (which can only happen 1915 * in AP mode) 1916 */ 1917 multicast = is_multicast_ether_addr(hdr.addr1); 1918 if (!multicast) { 1919 rcu_read_lock(); 1920 sta = sta_info_get(sdata, hdr.addr1); 1921 if (sta) { 1922 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1923 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1924 } 1925 rcu_read_unlock(); 1926 } 1927 1928 /* For mesh, the use of the QoS header is mandatory */ 1929 if (ieee80211_vif_is_mesh(&sdata->vif)) 1930 wme_sta = true; 1931 1932 /* receiver and we are QoS enabled, use a QoS type frame */ 1933 if (wme_sta && local->hw.queues >= 4) { 1934 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1935 hdrlen += 2; 1936 } 1937 1938 /* 1939 * Drop unicast frames to unauthorised stations unless they are 1940 * EAPOL frames from the local station. 1941 */ 1942 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1943 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1944 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1945 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1946 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1947 if (net_ratelimit()) 1948 printk(KERN_DEBUG "%s: dropped frame to %pM" 1949 " (unauthorized port)\n", dev->name, 1950 hdr.addr1); 1951 #endif 1952 1953 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1954 1955 ret = NETDEV_TX_OK; 1956 goto fail; 1957 } 1958 1959 if (unlikely(!multicast && skb->sk && 1960 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1961 struct sk_buff *orig_skb = skb; 1962 1963 skb = skb_clone(skb, GFP_ATOMIC); 1964 if (skb) { 1965 unsigned long flags; 1966 int id, r; 1967 1968 spin_lock_irqsave(&local->ack_status_lock, flags); 1969 r = idr_get_new_above(&local->ack_status_frames, 1970 orig_skb, 1, &id); 1971 if (r == -EAGAIN) { 1972 idr_pre_get(&local->ack_status_frames, 1973 GFP_ATOMIC); 1974 r = idr_get_new_above(&local->ack_status_frames, 1975 orig_skb, 1, &id); 1976 } 1977 if (WARN_ON(!id) || id > 0xffff) { 1978 idr_remove(&local->ack_status_frames, id); 1979 r = -ERANGE; 1980 } 1981 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1982 1983 if (!r) { 1984 info_id = id; 1985 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1986 } else if (skb_shared(skb)) { 1987 kfree_skb(orig_skb); 1988 } else { 1989 kfree_skb(skb); 1990 skb = orig_skb; 1991 } 1992 } else { 1993 /* couldn't clone -- lose tx status ... */ 1994 skb = orig_skb; 1995 } 1996 } 1997 1998 /* 1999 * If the skb is shared we need to obtain our own copy. 2000 */ 2001 if (skb_shared(skb)) { 2002 struct sk_buff *tmp_skb = skb; 2003 2004 /* can't happen -- skb is a clone if info_id != 0 */ 2005 WARN_ON(info_id); 2006 2007 skb = skb_clone(skb, GFP_ATOMIC); 2008 kfree_skb(tmp_skb); 2009 2010 if (!skb) { 2011 ret = NETDEV_TX_OK; 2012 goto fail; 2013 } 2014 } 2015 2016 hdr.frame_control = fc; 2017 hdr.duration_id = 0; 2018 hdr.seq_ctrl = 0; 2019 2020 skip_header_bytes = ETH_HLEN; 2021 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2022 encaps_data = bridge_tunnel_header; 2023 encaps_len = sizeof(bridge_tunnel_header); 2024 skip_header_bytes -= 2; 2025 } else if (ethertype >= 0x600) { 2026 encaps_data = rfc1042_header; 2027 encaps_len = sizeof(rfc1042_header); 2028 skip_header_bytes -= 2; 2029 } else { 2030 encaps_data = NULL; 2031 encaps_len = 0; 2032 } 2033 2034 nh_pos = skb_network_header(skb) - skb->data; 2035 h_pos = skb_transport_header(skb) - skb->data; 2036 2037 skb_pull(skb, skip_header_bytes); 2038 nh_pos -= skip_header_bytes; 2039 h_pos -= skip_header_bytes; 2040 2041 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2042 2043 /* 2044 * So we need to modify the skb header and hence need a copy of 2045 * that. The head_need variable above doesn't, so far, include 2046 * the needed header space that we don't need right away. If we 2047 * can, then we don't reallocate right now but only after the 2048 * frame arrives at the master device (if it does...) 2049 * 2050 * If we cannot, however, then we will reallocate to include all 2051 * the ever needed space. Also, if we need to reallocate it anyway, 2052 * make it big enough for everything we may ever need. 2053 */ 2054 2055 if (head_need > 0 || skb_cloned(skb)) { 2056 head_need += IEEE80211_ENCRYPT_HEADROOM; 2057 head_need += local->tx_headroom; 2058 head_need = max_t(int, 0, head_need); 2059 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 2060 goto fail; 2061 } 2062 2063 if (encaps_data) { 2064 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2065 nh_pos += encaps_len; 2066 h_pos += encaps_len; 2067 } 2068 2069 #ifdef CONFIG_MAC80211_MESH 2070 if (meshhdrlen > 0) { 2071 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2072 nh_pos += meshhdrlen; 2073 h_pos += meshhdrlen; 2074 } 2075 #endif 2076 2077 if (ieee80211_is_data_qos(fc)) { 2078 __le16 *qos_control; 2079 2080 qos_control = (__le16*) skb_push(skb, 2); 2081 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2082 /* 2083 * Maybe we could actually set some fields here, for now just 2084 * initialise to zero to indicate no special operation. 2085 */ 2086 *qos_control = 0; 2087 } else 2088 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2089 2090 nh_pos += hdrlen; 2091 h_pos += hdrlen; 2092 2093 dev->stats.tx_packets++; 2094 dev->stats.tx_bytes += skb->len; 2095 2096 /* Update skb pointers to various headers since this modified frame 2097 * is going to go through Linux networking code that may potentially 2098 * need things like pointer to IP header. */ 2099 skb_set_mac_header(skb, 0); 2100 skb_set_network_header(skb, nh_pos); 2101 skb_set_transport_header(skb, h_pos); 2102 2103 info = IEEE80211_SKB_CB(skb); 2104 memset(info, 0, sizeof(*info)); 2105 2106 dev->trans_start = jiffies; 2107 2108 info->flags = info_flags; 2109 info->ack_frame_id = info_id; 2110 2111 ieee80211_xmit(sdata, skb); 2112 2113 return NETDEV_TX_OK; 2114 2115 fail: 2116 if (ret == NETDEV_TX_OK) 2117 dev_kfree_skb(skb); 2118 2119 return ret; 2120 } 2121 2122 2123 /* 2124 * ieee80211_clear_tx_pending may not be called in a context where 2125 * it is possible that it packets could come in again. 2126 */ 2127 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2128 { 2129 int i; 2130 2131 for (i = 0; i < local->hw.queues; i++) 2132 skb_queue_purge(&local->pending[i]); 2133 } 2134 2135 /* 2136 * Returns false if the frame couldn't be transmitted but was queued instead, 2137 * which in this case means re-queued -- take as an indication to stop sending 2138 * more pending frames. 2139 */ 2140 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2141 struct sk_buff *skb) 2142 { 2143 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2144 struct ieee80211_sub_if_data *sdata; 2145 struct sta_info *sta; 2146 struct ieee80211_hdr *hdr; 2147 bool result; 2148 2149 sdata = vif_to_sdata(info->control.vif); 2150 2151 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2152 result = ieee80211_tx(sdata, skb, true); 2153 } else { 2154 struct sk_buff_head skbs; 2155 2156 __skb_queue_head_init(&skbs); 2157 __skb_queue_tail(&skbs, skb); 2158 2159 hdr = (struct ieee80211_hdr *)skb->data; 2160 sta = sta_info_get(sdata, hdr->addr1); 2161 2162 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2163 } 2164 2165 return result; 2166 } 2167 2168 /* 2169 * Transmit all pending packets. Called from tasklet. 2170 */ 2171 void ieee80211_tx_pending(unsigned long data) 2172 { 2173 struct ieee80211_local *local = (struct ieee80211_local *)data; 2174 struct ieee80211_sub_if_data *sdata; 2175 unsigned long flags; 2176 int i; 2177 bool txok; 2178 2179 rcu_read_lock(); 2180 2181 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2182 for (i = 0; i < local->hw.queues; i++) { 2183 /* 2184 * If queue is stopped by something other than due to pending 2185 * frames, or we have no pending frames, proceed to next queue. 2186 */ 2187 if (local->queue_stop_reasons[i] || 2188 skb_queue_empty(&local->pending[i])) 2189 continue; 2190 2191 while (!skb_queue_empty(&local->pending[i])) { 2192 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2193 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2194 2195 if (WARN_ON(!info->control.vif)) { 2196 kfree_skb(skb); 2197 continue; 2198 } 2199 2200 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2201 flags); 2202 2203 txok = ieee80211_tx_pending_skb(local, skb); 2204 spin_lock_irqsave(&local->queue_stop_reason_lock, 2205 flags); 2206 if (!txok) 2207 break; 2208 } 2209 2210 if (skb_queue_empty(&local->pending[i])) 2211 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2212 netif_wake_subqueue(sdata->dev, i); 2213 } 2214 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2215 2216 rcu_read_unlock(); 2217 } 2218 2219 /* functions for drivers to get certain frames */ 2220 2221 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2222 struct ieee80211_if_ap *bss, 2223 struct sk_buff *skb, 2224 struct beacon_data *beacon) 2225 { 2226 u8 *pos, *tim; 2227 int aid0 = 0; 2228 int i, have_bits = 0, n1, n2; 2229 2230 /* Generate bitmap for TIM only if there are any STAs in power save 2231 * mode. */ 2232 if (atomic_read(&bss->num_sta_ps) > 0) 2233 /* in the hope that this is faster than 2234 * checking byte-for-byte */ 2235 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2236 IEEE80211_MAX_AID+1); 2237 2238 if (bss->dtim_count == 0) 2239 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2240 else 2241 bss->dtim_count--; 2242 2243 tim = pos = (u8 *) skb_put(skb, 6); 2244 *pos++ = WLAN_EID_TIM; 2245 *pos++ = 4; 2246 *pos++ = bss->dtim_count; 2247 *pos++ = sdata->vif.bss_conf.dtim_period; 2248 2249 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2250 aid0 = 1; 2251 2252 bss->dtim_bc_mc = aid0 == 1; 2253 2254 if (have_bits) { 2255 /* Find largest even number N1 so that bits numbered 1 through 2256 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2257 * (N2 + 1) x 8 through 2007 are 0. */ 2258 n1 = 0; 2259 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2260 if (bss->tim[i]) { 2261 n1 = i & 0xfe; 2262 break; 2263 } 2264 } 2265 n2 = n1; 2266 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2267 if (bss->tim[i]) { 2268 n2 = i; 2269 break; 2270 } 2271 } 2272 2273 /* Bitmap control */ 2274 *pos++ = n1 | aid0; 2275 /* Part Virt Bitmap */ 2276 skb_put(skb, n2 - n1); 2277 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2278 2279 tim[1] = n2 - n1 + 4; 2280 } else { 2281 *pos++ = aid0; /* Bitmap control */ 2282 *pos++ = 0; /* Part Virt Bitmap */ 2283 } 2284 } 2285 2286 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2287 struct ieee80211_vif *vif, 2288 u16 *tim_offset, u16 *tim_length) 2289 { 2290 struct ieee80211_local *local = hw_to_local(hw); 2291 struct sk_buff *skb = NULL; 2292 struct ieee80211_tx_info *info; 2293 struct ieee80211_sub_if_data *sdata = NULL; 2294 struct ieee80211_if_ap *ap = NULL; 2295 struct beacon_data *beacon; 2296 struct ieee80211_supported_band *sband; 2297 enum ieee80211_band band = local->hw.conf.channel->band; 2298 struct ieee80211_tx_rate_control txrc; 2299 2300 sband = local->hw.wiphy->bands[band]; 2301 2302 rcu_read_lock(); 2303 2304 sdata = vif_to_sdata(vif); 2305 2306 if (!ieee80211_sdata_running(sdata)) 2307 goto out; 2308 2309 if (tim_offset) 2310 *tim_offset = 0; 2311 if (tim_length) 2312 *tim_length = 0; 2313 2314 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2315 ap = &sdata->u.ap; 2316 beacon = rcu_dereference(ap->beacon); 2317 if (beacon) { 2318 /* 2319 * headroom, head length, 2320 * tail length and maximum TIM length 2321 */ 2322 skb = dev_alloc_skb(local->tx_headroom + 2323 beacon->head_len + 2324 beacon->tail_len + 256); 2325 if (!skb) 2326 goto out; 2327 2328 skb_reserve(skb, local->tx_headroom); 2329 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2330 beacon->head_len); 2331 2332 /* 2333 * Not very nice, but we want to allow the driver to call 2334 * ieee80211_beacon_get() as a response to the set_tim() 2335 * callback. That, however, is already invoked under the 2336 * sta_lock to guarantee consistent and race-free update 2337 * of the tim bitmap in mac80211 and the driver. 2338 */ 2339 if (local->tim_in_locked_section) { 2340 ieee80211_beacon_add_tim(sdata, ap, skb, 2341 beacon); 2342 } else { 2343 unsigned long flags; 2344 2345 spin_lock_irqsave(&local->tim_lock, flags); 2346 ieee80211_beacon_add_tim(sdata, ap, skb, 2347 beacon); 2348 spin_unlock_irqrestore(&local->tim_lock, flags); 2349 } 2350 2351 if (tim_offset) 2352 *tim_offset = beacon->head_len; 2353 if (tim_length) 2354 *tim_length = skb->len - beacon->head_len; 2355 2356 if (beacon->tail) 2357 memcpy(skb_put(skb, beacon->tail_len), 2358 beacon->tail, beacon->tail_len); 2359 } else 2360 goto out; 2361 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2362 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2363 struct ieee80211_hdr *hdr; 2364 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2365 2366 if (!presp) 2367 goto out; 2368 2369 skb = skb_copy(presp, GFP_ATOMIC); 2370 if (!skb) 2371 goto out; 2372 2373 hdr = (struct ieee80211_hdr *) skb->data; 2374 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2375 IEEE80211_STYPE_BEACON); 2376 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2377 struct ieee80211_mgmt *mgmt; 2378 u8 *pos; 2379 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2380 sizeof(mgmt->u.beacon); 2381 2382 #ifdef CONFIG_MAC80211_MESH 2383 if (!sdata->u.mesh.mesh_id_len) 2384 goto out; 2385 #endif 2386 2387 skb = dev_alloc_skb(local->tx_headroom + 2388 hdr_len + 2389 2 + /* NULL SSID */ 2390 2 + 8 + /* supported rates */ 2391 2 + 3 + /* DS params */ 2392 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2393 2 + sizeof(struct ieee80211_ht_cap) + 2394 2 + sizeof(struct ieee80211_ht_info) + 2395 2 + sdata->u.mesh.mesh_id_len + 2396 2 + sizeof(struct ieee80211_meshconf_ie) + 2397 sdata->u.mesh.ie_len); 2398 if (!skb) 2399 goto out; 2400 2401 skb_reserve(skb, local->hw.extra_tx_headroom); 2402 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2403 memset(mgmt, 0, hdr_len); 2404 mgmt->frame_control = 2405 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2406 memset(mgmt->da, 0xff, ETH_ALEN); 2407 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2408 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2409 mgmt->u.beacon.beacon_int = 2410 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2411 mgmt->u.beacon.capab_info |= cpu_to_le16( 2412 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2413 2414 pos = skb_put(skb, 2); 2415 *pos++ = WLAN_EID_SSID; 2416 *pos++ = 0x0; 2417 2418 if (ieee80211_add_srates_ie(&sdata->vif, skb) || 2419 mesh_add_ds_params_ie(skb, sdata) || 2420 ieee80211_add_ext_srates_ie(&sdata->vif, skb) || 2421 mesh_add_rsn_ie(skb, sdata) || 2422 mesh_add_ht_cap_ie(skb, sdata) || 2423 mesh_add_ht_info_ie(skb, sdata) || 2424 mesh_add_meshid_ie(skb, sdata) || 2425 mesh_add_meshconf_ie(skb, sdata) || 2426 mesh_add_vendor_ies(skb, sdata)) { 2427 pr_err("o11s: couldn't add ies!\n"); 2428 goto out; 2429 } 2430 } else { 2431 WARN_ON(1); 2432 goto out; 2433 } 2434 2435 info = IEEE80211_SKB_CB(skb); 2436 2437 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2438 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2439 info->band = band; 2440 2441 memset(&txrc, 0, sizeof(txrc)); 2442 txrc.hw = hw; 2443 txrc.sband = sband; 2444 txrc.bss_conf = &sdata->vif.bss_conf; 2445 txrc.skb = skb; 2446 txrc.reported_rate.idx = -1; 2447 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2448 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2449 txrc.max_rate_idx = -1; 2450 else 2451 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2452 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2453 sizeof(txrc.rate_idx_mcs_mask)); 2454 txrc.bss = true; 2455 rate_control_get_rate(sdata, NULL, &txrc); 2456 2457 info->control.vif = vif; 2458 2459 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2460 IEEE80211_TX_CTL_ASSIGN_SEQ | 2461 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2462 out: 2463 rcu_read_unlock(); 2464 return skb; 2465 } 2466 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2467 2468 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2469 struct ieee80211_vif *vif) 2470 { 2471 struct ieee80211_if_ap *ap = NULL; 2472 struct sk_buff *presp = NULL, *skb = NULL; 2473 struct ieee80211_hdr *hdr; 2474 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2475 2476 if (sdata->vif.type != NL80211_IFTYPE_AP) 2477 return NULL; 2478 2479 rcu_read_lock(); 2480 2481 ap = &sdata->u.ap; 2482 presp = rcu_dereference(ap->probe_resp); 2483 if (!presp) 2484 goto out; 2485 2486 skb = skb_copy(presp, GFP_ATOMIC); 2487 if (!skb) 2488 goto out; 2489 2490 hdr = (struct ieee80211_hdr *) skb->data; 2491 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2492 2493 out: 2494 rcu_read_unlock(); 2495 return skb; 2496 } 2497 EXPORT_SYMBOL(ieee80211_proberesp_get); 2498 2499 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2500 struct ieee80211_vif *vif) 2501 { 2502 struct ieee80211_sub_if_data *sdata; 2503 struct ieee80211_if_managed *ifmgd; 2504 struct ieee80211_pspoll *pspoll; 2505 struct ieee80211_local *local; 2506 struct sk_buff *skb; 2507 2508 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2509 return NULL; 2510 2511 sdata = vif_to_sdata(vif); 2512 ifmgd = &sdata->u.mgd; 2513 local = sdata->local; 2514 2515 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2516 if (!skb) 2517 return NULL; 2518 2519 skb_reserve(skb, local->hw.extra_tx_headroom); 2520 2521 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2522 memset(pspoll, 0, sizeof(*pspoll)); 2523 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2524 IEEE80211_STYPE_PSPOLL); 2525 pspoll->aid = cpu_to_le16(ifmgd->aid); 2526 2527 /* aid in PS-Poll has its two MSBs each set to 1 */ 2528 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2529 2530 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2531 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2532 2533 return skb; 2534 } 2535 EXPORT_SYMBOL(ieee80211_pspoll_get); 2536 2537 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2538 struct ieee80211_vif *vif) 2539 { 2540 struct ieee80211_hdr_3addr *nullfunc; 2541 struct ieee80211_sub_if_data *sdata; 2542 struct ieee80211_if_managed *ifmgd; 2543 struct ieee80211_local *local; 2544 struct sk_buff *skb; 2545 2546 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2547 return NULL; 2548 2549 sdata = vif_to_sdata(vif); 2550 ifmgd = &sdata->u.mgd; 2551 local = sdata->local; 2552 2553 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2554 if (!skb) 2555 return NULL; 2556 2557 skb_reserve(skb, local->hw.extra_tx_headroom); 2558 2559 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2560 sizeof(*nullfunc)); 2561 memset(nullfunc, 0, sizeof(*nullfunc)); 2562 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2563 IEEE80211_STYPE_NULLFUNC | 2564 IEEE80211_FCTL_TODS); 2565 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2566 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2567 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2568 2569 return skb; 2570 } 2571 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2572 2573 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2574 struct ieee80211_vif *vif, 2575 const u8 *ssid, size_t ssid_len, 2576 const u8 *ie, size_t ie_len) 2577 { 2578 struct ieee80211_sub_if_data *sdata; 2579 struct ieee80211_local *local; 2580 struct ieee80211_hdr_3addr *hdr; 2581 struct sk_buff *skb; 2582 size_t ie_ssid_len; 2583 u8 *pos; 2584 2585 sdata = vif_to_sdata(vif); 2586 local = sdata->local; 2587 ie_ssid_len = 2 + ssid_len; 2588 2589 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2590 ie_ssid_len + ie_len); 2591 if (!skb) 2592 return NULL; 2593 2594 skb_reserve(skb, local->hw.extra_tx_headroom); 2595 2596 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2597 memset(hdr, 0, sizeof(*hdr)); 2598 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2599 IEEE80211_STYPE_PROBE_REQ); 2600 memset(hdr->addr1, 0xff, ETH_ALEN); 2601 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2602 memset(hdr->addr3, 0xff, ETH_ALEN); 2603 2604 pos = skb_put(skb, ie_ssid_len); 2605 *pos++ = WLAN_EID_SSID; 2606 *pos++ = ssid_len; 2607 if (ssid) 2608 memcpy(pos, ssid, ssid_len); 2609 pos += ssid_len; 2610 2611 if (ie) { 2612 pos = skb_put(skb, ie_len); 2613 memcpy(pos, ie, ie_len); 2614 } 2615 2616 return skb; 2617 } 2618 EXPORT_SYMBOL(ieee80211_probereq_get); 2619 2620 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2621 const void *frame, size_t frame_len, 2622 const struct ieee80211_tx_info *frame_txctl, 2623 struct ieee80211_rts *rts) 2624 { 2625 const struct ieee80211_hdr *hdr = frame; 2626 2627 rts->frame_control = 2628 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2629 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2630 frame_txctl); 2631 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2632 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2633 } 2634 EXPORT_SYMBOL(ieee80211_rts_get); 2635 2636 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2637 const void *frame, size_t frame_len, 2638 const struct ieee80211_tx_info *frame_txctl, 2639 struct ieee80211_cts *cts) 2640 { 2641 const struct ieee80211_hdr *hdr = frame; 2642 2643 cts->frame_control = 2644 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2645 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2646 frame_len, frame_txctl); 2647 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2648 } 2649 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2650 2651 struct sk_buff * 2652 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2653 struct ieee80211_vif *vif) 2654 { 2655 struct ieee80211_local *local = hw_to_local(hw); 2656 struct sk_buff *skb = NULL; 2657 struct ieee80211_tx_data tx; 2658 struct ieee80211_sub_if_data *sdata; 2659 struct ieee80211_if_ap *bss = NULL; 2660 struct beacon_data *beacon; 2661 struct ieee80211_tx_info *info; 2662 2663 sdata = vif_to_sdata(vif); 2664 bss = &sdata->u.ap; 2665 2666 rcu_read_lock(); 2667 beacon = rcu_dereference(bss->beacon); 2668 2669 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2670 goto out; 2671 2672 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2673 goto out; /* send buffered bc/mc only after DTIM beacon */ 2674 2675 while (1) { 2676 skb = skb_dequeue(&bss->ps_bc_buf); 2677 if (!skb) 2678 goto out; 2679 local->total_ps_buffered--; 2680 2681 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2682 struct ieee80211_hdr *hdr = 2683 (struct ieee80211_hdr *) skb->data; 2684 /* more buffered multicast/broadcast frames ==> set 2685 * MoreData flag in IEEE 802.11 header to inform PS 2686 * STAs */ 2687 hdr->frame_control |= 2688 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2689 } 2690 2691 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2692 break; 2693 dev_kfree_skb_any(skb); 2694 } 2695 2696 info = IEEE80211_SKB_CB(skb); 2697 2698 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2699 tx.channel = local->hw.conf.channel; 2700 info->band = tx.channel->band; 2701 2702 if (invoke_tx_handlers(&tx)) 2703 skb = NULL; 2704 out: 2705 rcu_read_unlock(); 2706 2707 return skb; 2708 } 2709 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2710 2711 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2712 struct sk_buff *skb, int tid) 2713 { 2714 skb_set_mac_header(skb, 0); 2715 skb_set_network_header(skb, 0); 2716 skb_set_transport_header(skb, 0); 2717 2718 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 2719 skb->priority = tid; 2720 2721 /* 2722 * The other path calling ieee80211_xmit is from the tasklet, 2723 * and while we can handle concurrent transmissions locking 2724 * requirements are that we do not come into tx with bhs on. 2725 */ 2726 local_bh_disable(); 2727 ieee80211_xmit(sdata, skb); 2728 local_bh_enable(); 2729 } 2730