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: local->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 && (local->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 ieee80211_is_probe_resp(hdr->frame_control) || 453 ieee80211_is_auth(hdr->frame_control) || 454 ieee80211_is_assoc_resp(hdr->frame_control) || 455 ieee80211_is_reassoc_resp(hdr->frame_control))) 456 return TX_CONTINUE; 457 458 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 459 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 460 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) { 461 int ac = skb_get_queue_mapping(tx->skb); 462 463 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 464 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n", 465 sta->sta.addr, sta->sta.aid, ac); 466 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 467 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 468 purge_old_ps_buffers(tx->local); 469 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 470 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 471 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 472 if (net_ratelimit()) 473 printk(KERN_DEBUG "%s: STA %pM TX buffer for " 474 "AC %d full - dropping oldest frame\n", 475 tx->sdata->name, sta->sta.addr, ac); 476 #endif 477 dev_kfree_skb(old); 478 } else 479 tx->local->total_ps_buffered++; 480 481 info->control.jiffies = jiffies; 482 info->control.vif = &tx->sdata->vif; 483 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 484 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 485 486 if (!timer_pending(&local->sta_cleanup)) 487 mod_timer(&local->sta_cleanup, 488 round_jiffies(jiffies + 489 STA_INFO_CLEANUP_INTERVAL)); 490 491 /* 492 * We queued up some frames, so the TIM bit might 493 * need to be set, recalculate it. 494 */ 495 sta_info_recalc_tim(sta); 496 497 return TX_QUEUED; 498 } 499 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 500 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 501 printk(KERN_DEBUG 502 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n", 503 tx->sdata->name, sta->sta.addr); 504 } 505 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 506 507 return TX_CONTINUE; 508 } 509 510 static ieee80211_tx_result debug_noinline 511 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 512 { 513 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 514 return TX_CONTINUE; 515 516 if (tx->flags & IEEE80211_TX_UNICAST) 517 return ieee80211_tx_h_unicast_ps_buf(tx); 518 else 519 return ieee80211_tx_h_multicast_ps_buf(tx); 520 } 521 522 static ieee80211_tx_result debug_noinline 523 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 524 { 525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 526 527 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 528 tx->sdata->control_port_no_encrypt)) 529 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 530 531 return TX_CONTINUE; 532 } 533 534 static ieee80211_tx_result debug_noinline 535 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 536 { 537 struct ieee80211_key *key = NULL; 538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 539 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 540 541 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 542 tx->key = NULL; 543 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 544 tx->key = key; 545 else if (ieee80211_is_mgmt(hdr->frame_control) && 546 is_multicast_ether_addr(hdr->addr1) && 547 ieee80211_is_robust_mgmt_frame(hdr) && 548 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 549 tx->key = key; 550 else if (is_multicast_ether_addr(hdr->addr1) && 551 (key = rcu_dereference(tx->sdata->default_multicast_key))) 552 tx->key = key; 553 else if (!is_multicast_ether_addr(hdr->addr1) && 554 (key = rcu_dereference(tx->sdata->default_unicast_key))) 555 tx->key = key; 556 else if (tx->sdata->drop_unencrypted && 557 (tx->skb->protocol != tx->sdata->control_port_protocol) && 558 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 559 (!ieee80211_is_robust_mgmt_frame(hdr) || 560 (ieee80211_is_action(hdr->frame_control) && 561 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) { 562 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 563 return TX_DROP; 564 } else 565 tx->key = NULL; 566 567 if (tx->key) { 568 bool skip_hw = false; 569 570 tx->key->tx_rx_count++; 571 /* TODO: add threshold stuff again */ 572 573 switch (tx->key->conf.cipher) { 574 case WLAN_CIPHER_SUITE_WEP40: 575 case WLAN_CIPHER_SUITE_WEP104: 576 case WLAN_CIPHER_SUITE_TKIP: 577 if (!ieee80211_is_data_present(hdr->frame_control)) 578 tx->key = NULL; 579 break; 580 case WLAN_CIPHER_SUITE_CCMP: 581 if (!ieee80211_is_data_present(hdr->frame_control) && 582 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 583 tx->skb)) 584 tx->key = NULL; 585 else 586 skip_hw = (tx->key->conf.flags & 587 IEEE80211_KEY_FLAG_SW_MGMT) && 588 ieee80211_is_mgmt(hdr->frame_control); 589 break; 590 case WLAN_CIPHER_SUITE_AES_CMAC: 591 if (!ieee80211_is_mgmt(hdr->frame_control)) 592 tx->key = NULL; 593 break; 594 } 595 596 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 597 return TX_DROP; 598 599 if (!skip_hw && tx->key && 600 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 601 info->control.hw_key = &tx->key->conf; 602 } 603 604 return TX_CONTINUE; 605 } 606 607 static ieee80211_tx_result debug_noinline 608 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 609 { 610 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 611 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 612 struct ieee80211_supported_band *sband; 613 struct ieee80211_rate *rate; 614 int i; 615 u32 len; 616 bool inval = false, rts = false, short_preamble = false; 617 struct ieee80211_tx_rate_control txrc; 618 bool assoc = false; 619 620 memset(&txrc, 0, sizeof(txrc)); 621 622 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 623 624 len = min_t(u32, tx->skb->len + FCS_LEN, 625 tx->local->hw.wiphy->frag_threshold); 626 627 /* set up the tx rate control struct we give the RC algo */ 628 txrc.hw = local_to_hw(tx->local); 629 txrc.sband = sband; 630 txrc.bss_conf = &tx->sdata->vif.bss_conf; 631 txrc.skb = tx->skb; 632 txrc.reported_rate.idx = -1; 633 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 634 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 635 txrc.max_rate_idx = -1; 636 else 637 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 638 memcpy(txrc.rate_idx_mcs_mask, 639 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band], 640 sizeof(txrc.rate_idx_mcs_mask)); 641 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 642 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 643 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 644 645 /* set up RTS protection if desired */ 646 if (len > tx->local->hw.wiphy->rts_threshold) { 647 txrc.rts = rts = true; 648 } 649 650 /* 651 * Use short preamble if the BSS can handle it, but not for 652 * management frames unless we know the receiver can handle 653 * that -- the management frame might be to a station that 654 * just wants a probe response. 655 */ 656 if (tx->sdata->vif.bss_conf.use_short_preamble && 657 (ieee80211_is_data(hdr->frame_control) || 658 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 659 txrc.short_preamble = short_preamble = true; 660 661 if (tx->sta) 662 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 663 664 /* 665 * Lets not bother rate control if we're associated and cannot 666 * talk to the sta. This should not happen. 667 */ 668 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 669 !rate_usable_index_exists(sband, &tx->sta->sta), 670 "%s: Dropped data frame as no usable bitrate found while " 671 "scanning and associated. Target station: " 672 "%pM on %d GHz band\n", 673 tx->sdata->name, hdr->addr1, 674 tx->channel->band ? 5 : 2)) 675 return TX_DROP; 676 677 /* 678 * If we're associated with the sta at this point we know we can at 679 * least send the frame at the lowest bit rate. 680 */ 681 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 682 683 if (unlikely(info->control.rates[0].idx < 0)) 684 return TX_DROP; 685 686 if (txrc.reported_rate.idx < 0) { 687 txrc.reported_rate = info->control.rates[0]; 688 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 689 tx->sta->last_tx_rate = txrc.reported_rate; 690 } else if (tx->sta) 691 tx->sta->last_tx_rate = txrc.reported_rate; 692 693 if (unlikely(!info->control.rates[0].count)) 694 info->control.rates[0].count = 1; 695 696 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 697 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 698 info->control.rates[0].count = 1; 699 700 if (is_multicast_ether_addr(hdr->addr1)) { 701 /* 702 * XXX: verify the rate is in the basic rateset 703 */ 704 return TX_CONTINUE; 705 } 706 707 /* 708 * set up the RTS/CTS rate as the fastest basic rate 709 * that is not faster than the data rate 710 * 711 * XXX: Should this check all retry rates? 712 */ 713 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 714 s8 baserate = 0; 715 716 rate = &sband->bitrates[info->control.rates[0].idx]; 717 718 for (i = 0; i < sband->n_bitrates; i++) { 719 /* must be a basic rate */ 720 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 721 continue; 722 /* must not be faster than the data rate */ 723 if (sband->bitrates[i].bitrate > rate->bitrate) 724 continue; 725 /* maximum */ 726 if (sband->bitrates[baserate].bitrate < 727 sband->bitrates[i].bitrate) 728 baserate = i; 729 } 730 731 info->control.rts_cts_rate_idx = baserate; 732 } 733 734 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 735 /* 736 * make sure there's no valid rate following 737 * an invalid one, just in case drivers don't 738 * take the API seriously to stop at -1. 739 */ 740 if (inval) { 741 info->control.rates[i].idx = -1; 742 continue; 743 } 744 if (info->control.rates[i].idx < 0) { 745 inval = true; 746 continue; 747 } 748 749 /* 750 * For now assume MCS is already set up correctly, this 751 * needs to be fixed. 752 */ 753 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 754 WARN_ON(info->control.rates[i].idx > 76); 755 continue; 756 } 757 758 /* set up RTS protection if desired */ 759 if (rts) 760 info->control.rates[i].flags |= 761 IEEE80211_TX_RC_USE_RTS_CTS; 762 763 /* RC is busted */ 764 if (WARN_ON_ONCE(info->control.rates[i].idx >= 765 sband->n_bitrates)) { 766 info->control.rates[i].idx = -1; 767 continue; 768 } 769 770 rate = &sband->bitrates[info->control.rates[i].idx]; 771 772 /* set up short preamble */ 773 if (short_preamble && 774 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 775 info->control.rates[i].flags |= 776 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 777 778 /* set up G protection */ 779 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 780 rate->flags & IEEE80211_RATE_ERP_G) 781 info->control.rates[i].flags |= 782 IEEE80211_TX_RC_USE_CTS_PROTECT; 783 } 784 785 return TX_CONTINUE; 786 } 787 788 static ieee80211_tx_result debug_noinline 789 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 790 { 791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 793 u16 *seq; 794 u8 *qc; 795 int tid; 796 797 /* 798 * Packet injection may want to control the sequence 799 * number, if we have no matching interface then we 800 * neither assign one ourselves nor ask the driver to. 801 */ 802 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 803 return TX_CONTINUE; 804 805 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 806 return TX_CONTINUE; 807 808 if (ieee80211_hdrlen(hdr->frame_control) < 24) 809 return TX_CONTINUE; 810 811 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 812 return TX_CONTINUE; 813 814 /* 815 * Anything but QoS data that has a sequence number field 816 * (is long enough) gets a sequence number from the global 817 * counter. 818 */ 819 if (!ieee80211_is_data_qos(hdr->frame_control)) { 820 /* driver should assign sequence number */ 821 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 822 /* for pure STA mode without beacons, we can do it */ 823 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 824 tx->sdata->sequence_number += 0x10; 825 return TX_CONTINUE; 826 } 827 828 /* 829 * This should be true for injected/management frames only, for 830 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 831 * above since they are not QoS-data frames. 832 */ 833 if (!tx->sta) 834 return TX_CONTINUE; 835 836 /* include per-STA, per-TID sequence counter */ 837 838 qc = ieee80211_get_qos_ctl(hdr); 839 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 840 seq = &tx->sta->tid_seq[tid]; 841 842 hdr->seq_ctrl = cpu_to_le16(*seq); 843 844 /* Increase the sequence number. */ 845 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 846 847 return TX_CONTINUE; 848 } 849 850 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 851 struct sk_buff *skb, int hdrlen, 852 int frag_threshold) 853 { 854 struct ieee80211_local *local = tx->local; 855 struct ieee80211_tx_info *info; 856 struct sk_buff *tmp; 857 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 858 int pos = hdrlen + per_fragm; 859 int rem = skb->len - hdrlen - per_fragm; 860 861 if (WARN_ON(rem < 0)) 862 return -EINVAL; 863 864 /* first fragment was already added to queue by caller */ 865 866 while (rem) { 867 int fraglen = per_fragm; 868 869 if (fraglen > rem) 870 fraglen = rem; 871 rem -= fraglen; 872 tmp = dev_alloc_skb(local->tx_headroom + 873 frag_threshold + 874 IEEE80211_ENCRYPT_HEADROOM + 875 IEEE80211_ENCRYPT_TAILROOM); 876 if (!tmp) 877 return -ENOMEM; 878 879 __skb_queue_tail(&tx->skbs, tmp); 880 881 skb_reserve(tmp, local->tx_headroom + 882 IEEE80211_ENCRYPT_HEADROOM); 883 /* copy control information */ 884 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 885 886 info = IEEE80211_SKB_CB(tmp); 887 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 888 IEEE80211_TX_CTL_FIRST_FRAGMENT); 889 890 if (rem) 891 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 892 893 skb_copy_queue_mapping(tmp, skb); 894 tmp->priority = skb->priority; 895 tmp->dev = skb->dev; 896 897 /* copy header and data */ 898 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 899 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 900 901 pos += fraglen; 902 } 903 904 /* adjust first fragment's length */ 905 skb->len = hdrlen + per_fragm; 906 return 0; 907 } 908 909 static ieee80211_tx_result debug_noinline 910 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 911 { 912 struct sk_buff *skb = tx->skb; 913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 914 struct ieee80211_hdr *hdr = (void *)skb->data; 915 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 916 int hdrlen; 917 int fragnum; 918 919 /* no matter what happens, tx->skb moves to tx->skbs */ 920 __skb_queue_tail(&tx->skbs, skb); 921 tx->skb = NULL; 922 923 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 924 return TX_CONTINUE; 925 926 if (tx->local->ops->set_frag_threshold) 927 return TX_CONTINUE; 928 929 /* 930 * Warn when submitting a fragmented A-MPDU frame and drop it. 931 * This scenario is handled in ieee80211_tx_prepare but extra 932 * caution taken here as fragmented ampdu may cause Tx stop. 933 */ 934 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 935 return TX_DROP; 936 937 hdrlen = ieee80211_hdrlen(hdr->frame_control); 938 939 /* internal error, why isn't DONTFRAG set? */ 940 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 941 return TX_DROP; 942 943 /* 944 * Now fragment the frame. This will allocate all the fragments and 945 * chain them (using skb as the first fragment) to skb->next. 946 * During transmission, we will remove the successfully transmitted 947 * fragments from this list. When the low-level driver rejects one 948 * of the fragments then we will simply pretend to accept the skb 949 * but store it away as pending. 950 */ 951 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 952 return TX_DROP; 953 954 /* update duration/seq/flags of fragments */ 955 fragnum = 0; 956 957 skb_queue_walk(&tx->skbs, skb) { 958 int next_len; 959 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 960 961 hdr = (void *)skb->data; 962 info = IEEE80211_SKB_CB(skb); 963 964 if (!skb_queue_is_last(&tx->skbs, skb)) { 965 hdr->frame_control |= morefrags; 966 /* 967 * No multi-rate retries for fragmented frames, that 968 * would completely throw off the NAV at other STAs. 969 */ 970 info->control.rates[1].idx = -1; 971 info->control.rates[2].idx = -1; 972 info->control.rates[3].idx = -1; 973 info->control.rates[4].idx = -1; 974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 975 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 976 } else { 977 hdr->frame_control &= ~morefrags; 978 next_len = 0; 979 } 980 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 981 fragnum++; 982 } 983 984 return TX_CONTINUE; 985 } 986 987 static ieee80211_tx_result debug_noinline 988 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 989 { 990 struct sk_buff *skb; 991 992 if (!tx->sta) 993 return TX_CONTINUE; 994 995 tx->sta->tx_packets++; 996 skb_queue_walk(&tx->skbs, skb) { 997 tx->sta->tx_fragments++; 998 tx->sta->tx_bytes += skb->len; 999 } 1000 1001 return TX_CONTINUE; 1002 } 1003 1004 static ieee80211_tx_result debug_noinline 1005 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1006 { 1007 if (!tx->key) 1008 return TX_CONTINUE; 1009 1010 switch (tx->key->conf.cipher) { 1011 case WLAN_CIPHER_SUITE_WEP40: 1012 case WLAN_CIPHER_SUITE_WEP104: 1013 return ieee80211_crypto_wep_encrypt(tx); 1014 case WLAN_CIPHER_SUITE_TKIP: 1015 return ieee80211_crypto_tkip_encrypt(tx); 1016 case WLAN_CIPHER_SUITE_CCMP: 1017 return ieee80211_crypto_ccmp_encrypt(tx); 1018 case WLAN_CIPHER_SUITE_AES_CMAC: 1019 return ieee80211_crypto_aes_cmac_encrypt(tx); 1020 default: 1021 return ieee80211_crypto_hw_encrypt(tx); 1022 } 1023 1024 return TX_DROP; 1025 } 1026 1027 static ieee80211_tx_result debug_noinline 1028 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1029 { 1030 struct sk_buff *skb; 1031 struct ieee80211_hdr *hdr; 1032 int next_len; 1033 bool group_addr; 1034 1035 skb_queue_walk(&tx->skbs, skb) { 1036 hdr = (void *) skb->data; 1037 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1038 break; /* must not overwrite AID */ 1039 if (!skb_queue_is_last(&tx->skbs, skb)) { 1040 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1041 next_len = next->len; 1042 } else 1043 next_len = 0; 1044 group_addr = is_multicast_ether_addr(hdr->addr1); 1045 1046 hdr->duration_id = 1047 ieee80211_duration(tx, skb, group_addr, next_len); 1048 } 1049 1050 return TX_CONTINUE; 1051 } 1052 1053 /* actual transmit path */ 1054 1055 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1056 struct sk_buff *skb, 1057 struct ieee80211_tx_info *info, 1058 struct tid_ampdu_tx *tid_tx, 1059 int tid) 1060 { 1061 bool queued = false; 1062 bool reset_agg_timer = false; 1063 1064 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1065 info->flags |= IEEE80211_TX_CTL_AMPDU; 1066 reset_agg_timer = true; 1067 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1068 /* 1069 * nothing -- this aggregation session is being started 1070 * but that might still fail with the driver 1071 */ 1072 } else { 1073 spin_lock(&tx->sta->lock); 1074 /* 1075 * Need to re-check now, because we may get here 1076 * 1077 * 1) in the window during which the setup is actually 1078 * already done, but not marked yet because not all 1079 * packets are spliced over to the driver pending 1080 * queue yet -- if this happened we acquire the lock 1081 * either before or after the splice happens, but 1082 * need to recheck which of these cases happened. 1083 * 1084 * 2) during session teardown, if the OPERATIONAL bit 1085 * was cleared due to the teardown but the pointer 1086 * hasn't been assigned NULL yet (or we loaded it 1087 * before it was assigned) -- in this case it may 1088 * now be NULL which means we should just let the 1089 * packet pass through because splicing the frames 1090 * back is already done. 1091 */ 1092 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1093 1094 if (!tid_tx) { 1095 /* do nothing, let packet pass through */ 1096 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1097 info->flags |= IEEE80211_TX_CTL_AMPDU; 1098 reset_agg_timer = true; 1099 } else { 1100 queued = true; 1101 info->control.vif = &tx->sdata->vif; 1102 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1103 __skb_queue_tail(&tid_tx->pending, skb); 1104 } 1105 spin_unlock(&tx->sta->lock); 1106 } 1107 1108 /* reset session timer */ 1109 if (reset_agg_timer && tid_tx->timeout) 1110 mod_timer(&tid_tx->session_timer, 1111 TU_TO_EXP_TIME(tid_tx->timeout)); 1112 1113 return queued; 1114 } 1115 1116 /* 1117 * initialises @tx 1118 */ 1119 static ieee80211_tx_result 1120 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1121 struct ieee80211_tx_data *tx, 1122 struct sk_buff *skb) 1123 { 1124 struct ieee80211_local *local = sdata->local; 1125 struct ieee80211_hdr *hdr; 1126 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1127 int tid; 1128 u8 *qc; 1129 1130 memset(tx, 0, sizeof(*tx)); 1131 tx->skb = skb; 1132 tx->local = local; 1133 tx->sdata = sdata; 1134 tx->channel = local->hw.conf.channel; 1135 __skb_queue_head_init(&tx->skbs); 1136 1137 /* 1138 * If this flag is set to true anywhere, and we get here, 1139 * we are doing the needed processing, so remove the flag 1140 * now. 1141 */ 1142 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1143 1144 hdr = (struct ieee80211_hdr *) skb->data; 1145 1146 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1147 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1148 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1149 return TX_DROP; 1150 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1151 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1152 } 1153 if (!tx->sta) 1154 tx->sta = sta_info_get(sdata, hdr->addr1); 1155 1156 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1157 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1158 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1159 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1160 struct tid_ampdu_tx *tid_tx; 1161 1162 qc = ieee80211_get_qos_ctl(hdr); 1163 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1164 1165 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1166 if (tid_tx) { 1167 bool queued; 1168 1169 queued = ieee80211_tx_prep_agg(tx, skb, info, 1170 tid_tx, tid); 1171 1172 if (unlikely(queued)) 1173 return TX_QUEUED; 1174 } 1175 } 1176 1177 if (is_multicast_ether_addr(hdr->addr1)) { 1178 tx->flags &= ~IEEE80211_TX_UNICAST; 1179 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1180 } else 1181 tx->flags |= IEEE80211_TX_UNICAST; 1182 1183 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1184 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1185 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1186 info->flags & IEEE80211_TX_CTL_AMPDU) 1187 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1188 } 1189 1190 if (!tx->sta) 1191 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1192 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1193 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1194 1195 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1196 1197 return TX_CONTINUE; 1198 } 1199 1200 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1201 struct ieee80211_vif *vif, 1202 struct ieee80211_sta *sta, 1203 struct sk_buff_head *skbs, 1204 bool txpending) 1205 { 1206 struct sk_buff *skb, *tmp; 1207 struct ieee80211_tx_info *info; 1208 unsigned long flags; 1209 1210 skb_queue_walk_safe(skbs, skb, tmp) { 1211 int q = skb_get_queue_mapping(skb); 1212 1213 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1214 if (local->queue_stop_reasons[q] || 1215 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1216 /* 1217 * Since queue is stopped, queue up frames for later 1218 * transmission from the tx-pending tasklet when the 1219 * queue is woken again. 1220 */ 1221 if (txpending) 1222 skb_queue_splice_init(skbs, &local->pending[q]); 1223 else 1224 skb_queue_splice_tail_init(skbs, 1225 &local->pending[q]); 1226 1227 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1228 flags); 1229 return false; 1230 } 1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1232 1233 info = IEEE80211_SKB_CB(skb); 1234 info->control.vif = vif; 1235 info->control.sta = sta; 1236 1237 __skb_unlink(skb, skbs); 1238 drv_tx(local, skb); 1239 } 1240 1241 return true; 1242 } 1243 1244 /* 1245 * Returns false if the frame couldn't be transmitted but was queued instead. 1246 */ 1247 static bool __ieee80211_tx(struct ieee80211_local *local, 1248 struct sk_buff_head *skbs, int led_len, 1249 struct sta_info *sta, bool txpending) 1250 { 1251 struct ieee80211_tx_info *info; 1252 struct ieee80211_sub_if_data *sdata; 1253 struct ieee80211_vif *vif; 1254 struct ieee80211_sta *pubsta; 1255 struct sk_buff *skb; 1256 bool result = true; 1257 __le16 fc; 1258 1259 if (WARN_ON(skb_queue_empty(skbs))) 1260 return true; 1261 1262 skb = skb_peek(skbs); 1263 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1264 info = IEEE80211_SKB_CB(skb); 1265 sdata = vif_to_sdata(info->control.vif); 1266 if (sta && !sta->uploaded) 1267 sta = NULL; 1268 1269 if (sta) 1270 pubsta = &sta->sta; 1271 else 1272 pubsta = NULL; 1273 1274 switch (sdata->vif.type) { 1275 case NL80211_IFTYPE_MONITOR: 1276 sdata = NULL; 1277 vif = NULL; 1278 break; 1279 case NL80211_IFTYPE_AP_VLAN: 1280 sdata = container_of(sdata->bss, 1281 struct ieee80211_sub_if_data, u.ap); 1282 /* fall through */ 1283 default: 1284 vif = &sdata->vif; 1285 break; 1286 } 1287 1288 if (local->ops->tx_frags) 1289 drv_tx_frags(local, vif, pubsta, skbs); 1290 else 1291 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1292 txpending); 1293 1294 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1295 ieee80211_led_tx(local, 1); 1296 1297 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1298 1299 return result; 1300 } 1301 1302 /* 1303 * Invoke TX handlers, return 0 on success and non-zero if the 1304 * frame was dropped or queued. 1305 */ 1306 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1307 { 1308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1309 ieee80211_tx_result res = TX_DROP; 1310 1311 #define CALL_TXH(txh) \ 1312 do { \ 1313 res = txh(tx); \ 1314 if (res != TX_CONTINUE) \ 1315 goto txh_done; \ 1316 } while (0) 1317 1318 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1319 CALL_TXH(ieee80211_tx_h_check_assoc); 1320 CALL_TXH(ieee80211_tx_h_ps_buf); 1321 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1322 CALL_TXH(ieee80211_tx_h_select_key); 1323 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1324 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1325 1326 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1327 __skb_queue_tail(&tx->skbs, tx->skb); 1328 tx->skb = NULL; 1329 goto txh_done; 1330 } 1331 1332 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1333 CALL_TXH(ieee80211_tx_h_sequence); 1334 CALL_TXH(ieee80211_tx_h_fragment); 1335 /* handlers after fragment must be aware of tx info fragmentation! */ 1336 CALL_TXH(ieee80211_tx_h_stats); 1337 CALL_TXH(ieee80211_tx_h_encrypt); 1338 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1339 CALL_TXH(ieee80211_tx_h_calculate_duration); 1340 #undef CALL_TXH 1341 1342 txh_done: 1343 if (unlikely(res == TX_DROP)) { 1344 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1345 if (tx->skb) 1346 dev_kfree_skb(tx->skb); 1347 else 1348 __skb_queue_purge(&tx->skbs); 1349 return -1; 1350 } else if (unlikely(res == TX_QUEUED)) { 1351 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1352 return -1; 1353 } 1354 1355 return 0; 1356 } 1357 1358 /* 1359 * Returns false if the frame couldn't be transmitted but was queued instead. 1360 */ 1361 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1362 struct sk_buff *skb, bool txpending) 1363 { 1364 struct ieee80211_local *local = sdata->local; 1365 struct ieee80211_tx_data tx; 1366 ieee80211_tx_result res_prepare; 1367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1368 bool result = true; 1369 int led_len; 1370 1371 if (unlikely(skb->len < 10)) { 1372 dev_kfree_skb(skb); 1373 return true; 1374 } 1375 1376 rcu_read_lock(); 1377 1378 /* initialises tx */ 1379 led_len = skb->len; 1380 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1381 1382 if (unlikely(res_prepare == TX_DROP)) { 1383 dev_kfree_skb(skb); 1384 goto out; 1385 } else if (unlikely(res_prepare == TX_QUEUED)) { 1386 goto out; 1387 } 1388 1389 tx.channel = local->hw.conf.channel; 1390 info->band = tx.channel->band; 1391 1392 if (!invoke_tx_handlers(&tx)) 1393 result = __ieee80211_tx(local, &tx.skbs, led_len, 1394 tx.sta, txpending); 1395 out: 1396 rcu_read_unlock(); 1397 return result; 1398 } 1399 1400 /* device xmit handlers */ 1401 1402 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1403 struct sk_buff *skb, 1404 int head_need, bool may_encrypt) 1405 { 1406 struct ieee80211_local *local = sdata->local; 1407 int tail_need = 0; 1408 1409 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1410 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1411 tail_need -= skb_tailroom(skb); 1412 tail_need = max_t(int, tail_need, 0); 1413 } 1414 1415 if (skb_cloned(skb)) 1416 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1417 else if (head_need || tail_need) 1418 I802_DEBUG_INC(local->tx_expand_skb_head); 1419 else 1420 return 0; 1421 1422 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1423 wiphy_debug(local->hw.wiphy, 1424 "failed to reallocate TX buffer\n"); 1425 return -ENOMEM; 1426 } 1427 1428 return 0; 1429 } 1430 1431 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1432 { 1433 struct ieee80211_local *local = sdata->local; 1434 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1436 int headroom; 1437 bool may_encrypt; 1438 1439 rcu_read_lock(); 1440 1441 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1442 1443 headroom = local->tx_headroom; 1444 if (may_encrypt) 1445 headroom += IEEE80211_ENCRYPT_HEADROOM; 1446 headroom -= skb_headroom(skb); 1447 headroom = max_t(int, 0, headroom); 1448 1449 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1450 dev_kfree_skb(skb); 1451 rcu_read_unlock(); 1452 return; 1453 } 1454 1455 hdr = (struct ieee80211_hdr *) skb->data; 1456 info->control.vif = &sdata->vif; 1457 1458 if (ieee80211_vif_is_mesh(&sdata->vif) && 1459 ieee80211_is_data(hdr->frame_control) && 1460 !is_multicast_ether_addr(hdr->addr1)) 1461 if (mesh_nexthop_resolve(skb, sdata)) { 1462 /* skb queued: don't free */ 1463 rcu_read_unlock(); 1464 return; 1465 } 1466 1467 ieee80211_set_qos_hdr(sdata, skb); 1468 ieee80211_tx(sdata, skb, false); 1469 rcu_read_unlock(); 1470 } 1471 1472 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1473 { 1474 struct ieee80211_radiotap_iterator iterator; 1475 struct ieee80211_radiotap_header *rthdr = 1476 (struct ieee80211_radiotap_header *) skb->data; 1477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1478 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1479 NULL); 1480 u16 txflags; 1481 1482 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1483 IEEE80211_TX_CTL_DONTFRAG; 1484 1485 /* 1486 * for every radiotap entry that is present 1487 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1488 * entries present, or -EINVAL on error) 1489 */ 1490 1491 while (!ret) { 1492 ret = ieee80211_radiotap_iterator_next(&iterator); 1493 1494 if (ret) 1495 continue; 1496 1497 /* see if this argument is something we can use */ 1498 switch (iterator.this_arg_index) { 1499 /* 1500 * You must take care when dereferencing iterator.this_arg 1501 * for multibyte types... the pointer is not aligned. Use 1502 * get_unaligned((type *)iterator.this_arg) to dereference 1503 * iterator.this_arg for type "type" safely on all arches. 1504 */ 1505 case IEEE80211_RADIOTAP_FLAGS: 1506 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1507 /* 1508 * this indicates that the skb we have been 1509 * handed has the 32-bit FCS CRC at the end... 1510 * we should react to that by snipping it off 1511 * because it will be recomputed and added 1512 * on transmission 1513 */ 1514 if (skb->len < (iterator._max_length + FCS_LEN)) 1515 return false; 1516 1517 skb_trim(skb, skb->len - FCS_LEN); 1518 } 1519 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1520 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1521 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1522 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1523 break; 1524 1525 case IEEE80211_RADIOTAP_TX_FLAGS: 1526 txflags = get_unaligned_le16(iterator.this_arg); 1527 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1528 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1529 break; 1530 1531 /* 1532 * Please update the file 1533 * Documentation/networking/mac80211-injection.txt 1534 * when parsing new fields here. 1535 */ 1536 1537 default: 1538 break; 1539 } 1540 } 1541 1542 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1543 return false; 1544 1545 /* 1546 * remove the radiotap header 1547 * iterator->_max_length was sanity-checked against 1548 * skb->len by iterator init 1549 */ 1550 skb_pull(skb, iterator._max_length); 1551 1552 return true; 1553 } 1554 1555 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1556 struct net_device *dev) 1557 { 1558 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1559 struct ieee80211_channel *chan = local->hw.conf.channel; 1560 struct ieee80211_radiotap_header *prthdr = 1561 (struct ieee80211_radiotap_header *)skb->data; 1562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1563 struct ieee80211_hdr *hdr; 1564 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1565 u16 len_rthdr; 1566 int hdrlen; 1567 1568 /* 1569 * Frame injection is not allowed if beaconing is not allowed 1570 * or if we need radar detection. Beaconing is usually not allowed when 1571 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1572 * Passive scan is also used in world regulatory domains where 1573 * your country is not known and as such it should be treated as 1574 * NO TX unless the channel is explicitly allowed in which case 1575 * your current regulatory domain would not have the passive scan 1576 * flag. 1577 * 1578 * Since AP mode uses monitor interfaces to inject/TX management 1579 * frames we can make AP mode the exception to this rule once it 1580 * supports radar detection as its implementation can deal with 1581 * radar detection by itself. We can do that later by adding a 1582 * monitor flag interfaces used for AP support. 1583 */ 1584 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1585 IEEE80211_CHAN_PASSIVE_SCAN))) 1586 goto fail; 1587 1588 /* check for not even having the fixed radiotap header part */ 1589 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1590 goto fail; /* too short to be possibly valid */ 1591 1592 /* is it a header version we can trust to find length from? */ 1593 if (unlikely(prthdr->it_version)) 1594 goto fail; /* only version 0 is supported */ 1595 1596 /* then there must be a radiotap header with a length we can use */ 1597 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1598 1599 /* does the skb contain enough to deliver on the alleged length? */ 1600 if (unlikely(skb->len < len_rthdr)) 1601 goto fail; /* skb too short for claimed rt header extent */ 1602 1603 /* 1604 * fix up the pointers accounting for the radiotap 1605 * header still being in there. We are being given 1606 * a precooked IEEE80211 header so no need for 1607 * normal processing 1608 */ 1609 skb_set_mac_header(skb, len_rthdr); 1610 /* 1611 * these are just fixed to the end of the rt area since we 1612 * don't have any better information and at this point, nobody cares 1613 */ 1614 skb_set_network_header(skb, len_rthdr); 1615 skb_set_transport_header(skb, len_rthdr); 1616 1617 if (skb->len < len_rthdr + 2) 1618 goto fail; 1619 1620 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1621 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1622 1623 if (skb->len < len_rthdr + hdrlen) 1624 goto fail; 1625 1626 /* 1627 * Initialize skb->protocol if the injected frame is a data frame 1628 * carrying a rfc1042 header 1629 */ 1630 if (ieee80211_is_data(hdr->frame_control) && 1631 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1632 u8 *payload = (u8 *)hdr + hdrlen; 1633 1634 if (compare_ether_addr(payload, rfc1042_header) == 0) 1635 skb->protocol = cpu_to_be16((payload[6] << 8) | 1636 payload[7]); 1637 } 1638 1639 memset(info, 0, sizeof(*info)); 1640 1641 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1642 IEEE80211_TX_CTL_INJECTED; 1643 1644 /* process and remove the injection radiotap header */ 1645 if (!ieee80211_parse_tx_radiotap(skb)) 1646 goto fail; 1647 1648 rcu_read_lock(); 1649 1650 /* 1651 * We process outgoing injected frames that have a local address 1652 * we handle as though they are non-injected frames. 1653 * This code here isn't entirely correct, the local MAC address 1654 * isn't always enough to find the interface to use; for proper 1655 * VLAN/WDS support we will need a different mechanism (which 1656 * likely isn't going to be monitor interfaces). 1657 */ 1658 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1659 1660 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1661 if (!ieee80211_sdata_running(tmp_sdata)) 1662 continue; 1663 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1664 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1665 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1666 continue; 1667 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { 1668 sdata = tmp_sdata; 1669 break; 1670 } 1671 } 1672 1673 ieee80211_xmit(sdata, skb); 1674 rcu_read_unlock(); 1675 1676 return NETDEV_TX_OK; 1677 1678 fail: 1679 dev_kfree_skb(skb); 1680 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1681 } 1682 1683 /** 1684 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1685 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1686 * @skb: packet to be sent 1687 * @dev: incoming interface 1688 * 1689 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1690 * not be freed, and caller is responsible for either retrying later or freeing 1691 * skb). 1692 * 1693 * This function takes in an Ethernet header and encapsulates it with suitable 1694 * IEEE 802.11 header based on which interface the packet is coming in. The 1695 * encapsulated packet will then be passed to master interface, wlan#.11, for 1696 * transmission (through low-level driver). 1697 */ 1698 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1699 struct net_device *dev) 1700 { 1701 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1702 struct ieee80211_local *local = sdata->local; 1703 struct ieee80211_tx_info *info; 1704 int ret = NETDEV_TX_BUSY, head_need; 1705 u16 ethertype, hdrlen, meshhdrlen = 0; 1706 __le16 fc; 1707 struct ieee80211_hdr hdr; 1708 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1709 struct mesh_path __maybe_unused *mppath = NULL; 1710 const u8 *encaps_data; 1711 int encaps_len, skip_header_bytes; 1712 int nh_pos, h_pos; 1713 struct sta_info *sta = NULL; 1714 bool wme_sta = false, authorized = false, tdls_auth = false; 1715 bool tdls_direct = false; 1716 bool multicast; 1717 u32 info_flags = 0; 1718 u16 info_id = 0; 1719 1720 if (unlikely(skb->len < ETH_HLEN)) { 1721 ret = NETDEV_TX_OK; 1722 goto fail; 1723 } 1724 1725 /* convert Ethernet header to proper 802.11 header (based on 1726 * operation mode) */ 1727 ethertype = (skb->data[12] << 8) | skb->data[13]; 1728 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1729 1730 switch (sdata->vif.type) { 1731 case NL80211_IFTYPE_AP_VLAN: 1732 rcu_read_lock(); 1733 sta = rcu_dereference(sdata->u.vlan.sta); 1734 if (sta) { 1735 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1736 /* RA TA DA SA */ 1737 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1738 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1739 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1740 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1741 hdrlen = 30; 1742 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1743 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1744 } 1745 rcu_read_unlock(); 1746 if (sta) 1747 break; 1748 /* fall through */ 1749 case NL80211_IFTYPE_AP: 1750 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1751 /* DA BSSID SA */ 1752 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1753 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1754 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1755 hdrlen = 24; 1756 break; 1757 case NL80211_IFTYPE_WDS: 1758 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1759 /* RA TA DA SA */ 1760 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1761 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1762 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1763 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1764 hdrlen = 30; 1765 break; 1766 #ifdef CONFIG_MAC80211_MESH 1767 case NL80211_IFTYPE_MESH_POINT: 1768 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1769 /* Do not send frames with mesh_ttl == 0 */ 1770 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1771 ret = NETDEV_TX_OK; 1772 goto fail; 1773 } 1774 rcu_read_lock(); 1775 if (!is_multicast_ether_addr(skb->data)) 1776 mppath = mpp_path_lookup(skb->data, sdata); 1777 1778 /* 1779 * Use address extension if it is a packet from 1780 * another interface or if we know the destination 1781 * is being proxied by a portal (i.e. portal address 1782 * differs from proxied address) 1783 */ 1784 if (compare_ether_addr(sdata->vif.addr, 1785 skb->data + ETH_ALEN) == 0 && 1786 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { 1787 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1788 skb->data, skb->data + ETH_ALEN); 1789 rcu_read_unlock(); 1790 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1791 sdata, NULL, NULL); 1792 } else { 1793 int is_mesh_mcast = 1; 1794 const u8 *mesh_da; 1795 1796 if (is_multicast_ether_addr(skb->data)) 1797 /* DA TA mSA AE:SA */ 1798 mesh_da = skb->data; 1799 else { 1800 static const u8 bcast[ETH_ALEN] = 1801 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1802 if (mppath) { 1803 /* RA TA mDA mSA AE:DA SA */ 1804 mesh_da = mppath->mpp; 1805 is_mesh_mcast = 0; 1806 } else { 1807 /* DA TA mSA AE:SA */ 1808 mesh_da = bcast; 1809 } 1810 } 1811 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1812 mesh_da, sdata->vif.addr); 1813 rcu_read_unlock(); 1814 if (is_mesh_mcast) 1815 meshhdrlen = 1816 ieee80211_new_mesh_header(&mesh_hdr, 1817 sdata, 1818 skb->data + ETH_ALEN, 1819 NULL); 1820 else 1821 meshhdrlen = 1822 ieee80211_new_mesh_header(&mesh_hdr, 1823 sdata, 1824 skb->data, 1825 skb->data + ETH_ALEN); 1826 1827 } 1828 break; 1829 #endif 1830 case NL80211_IFTYPE_STATION: 1831 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1832 bool tdls_peer = false; 1833 1834 rcu_read_lock(); 1835 sta = sta_info_get(sdata, skb->data); 1836 if (sta) { 1837 authorized = test_sta_flag(sta, 1838 WLAN_STA_AUTHORIZED); 1839 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1840 tdls_peer = test_sta_flag(sta, 1841 WLAN_STA_TDLS_PEER); 1842 tdls_auth = test_sta_flag(sta, 1843 WLAN_STA_TDLS_PEER_AUTH); 1844 } 1845 rcu_read_unlock(); 1846 1847 /* 1848 * If the TDLS link is enabled, send everything 1849 * directly. Otherwise, allow TDLS setup frames 1850 * to be transmitted indirectly. 1851 */ 1852 tdls_direct = tdls_peer && (tdls_auth || 1853 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1854 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1855 } 1856 1857 if (tdls_direct) { 1858 /* link during setup - throw out frames to peer */ 1859 if (!tdls_auth) { 1860 ret = NETDEV_TX_OK; 1861 goto fail; 1862 } 1863 1864 /* DA SA BSSID */ 1865 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1866 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1867 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1868 hdrlen = 24; 1869 } else if (sdata->u.mgd.use_4addr && 1870 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1871 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1872 IEEE80211_FCTL_TODS); 1873 /* RA TA DA SA */ 1874 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1875 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1876 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1877 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1878 hdrlen = 30; 1879 } else { 1880 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1881 /* BSSID SA DA */ 1882 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1883 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1884 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1885 hdrlen = 24; 1886 } 1887 break; 1888 case NL80211_IFTYPE_ADHOC: 1889 /* DA SA BSSID */ 1890 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1891 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1892 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1893 hdrlen = 24; 1894 break; 1895 default: 1896 ret = NETDEV_TX_OK; 1897 goto fail; 1898 } 1899 1900 /* 1901 * There's no need to try to look up the destination 1902 * if it is a multicast address (which can only happen 1903 * in AP mode) 1904 */ 1905 multicast = is_multicast_ether_addr(hdr.addr1); 1906 if (!multicast) { 1907 rcu_read_lock(); 1908 sta = sta_info_get(sdata, hdr.addr1); 1909 if (sta) { 1910 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1911 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1912 } 1913 rcu_read_unlock(); 1914 } 1915 1916 /* For mesh, the use of the QoS header is mandatory */ 1917 if (ieee80211_vif_is_mesh(&sdata->vif)) 1918 wme_sta = true; 1919 1920 /* receiver and we are QoS enabled, use a QoS type frame */ 1921 if (wme_sta && local->hw.queues >= 4) { 1922 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1923 hdrlen += 2; 1924 } 1925 1926 /* 1927 * Drop unicast frames to unauthorised stations unless they are 1928 * EAPOL frames from the local station. 1929 */ 1930 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1931 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1932 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1933 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1934 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1935 if (net_ratelimit()) 1936 printk(KERN_DEBUG "%s: dropped frame to %pM" 1937 " (unauthorized port)\n", dev->name, 1938 hdr.addr1); 1939 #endif 1940 1941 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1942 1943 ret = NETDEV_TX_OK; 1944 goto fail; 1945 } 1946 1947 if (unlikely(!multicast && skb->sk && 1948 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1949 struct sk_buff *orig_skb = skb; 1950 1951 skb = skb_clone(skb, GFP_ATOMIC); 1952 if (skb) { 1953 unsigned long flags; 1954 int id, r; 1955 1956 spin_lock_irqsave(&local->ack_status_lock, flags); 1957 r = idr_get_new_above(&local->ack_status_frames, 1958 orig_skb, 1, &id); 1959 if (r == -EAGAIN) { 1960 idr_pre_get(&local->ack_status_frames, 1961 GFP_ATOMIC); 1962 r = idr_get_new_above(&local->ack_status_frames, 1963 orig_skb, 1, &id); 1964 } 1965 if (WARN_ON(!id) || id > 0xffff) { 1966 idr_remove(&local->ack_status_frames, id); 1967 r = -ERANGE; 1968 } 1969 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1970 1971 if (!r) { 1972 info_id = id; 1973 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1974 } else if (skb_shared(skb)) { 1975 kfree_skb(orig_skb); 1976 } else { 1977 kfree_skb(skb); 1978 skb = orig_skb; 1979 } 1980 } else { 1981 /* couldn't clone -- lose tx status ... */ 1982 skb = orig_skb; 1983 } 1984 } 1985 1986 /* 1987 * If the skb is shared we need to obtain our own copy. 1988 */ 1989 if (skb_shared(skb)) { 1990 struct sk_buff *tmp_skb = skb; 1991 1992 /* can't happen -- skb is a clone if info_id != 0 */ 1993 WARN_ON(info_id); 1994 1995 skb = skb_clone(skb, GFP_ATOMIC); 1996 kfree_skb(tmp_skb); 1997 1998 if (!skb) { 1999 ret = NETDEV_TX_OK; 2000 goto fail; 2001 } 2002 } 2003 2004 hdr.frame_control = fc; 2005 hdr.duration_id = 0; 2006 hdr.seq_ctrl = 0; 2007 2008 skip_header_bytes = ETH_HLEN; 2009 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2010 encaps_data = bridge_tunnel_header; 2011 encaps_len = sizeof(bridge_tunnel_header); 2012 skip_header_bytes -= 2; 2013 } else if (ethertype >= 0x600) { 2014 encaps_data = rfc1042_header; 2015 encaps_len = sizeof(rfc1042_header); 2016 skip_header_bytes -= 2; 2017 } else { 2018 encaps_data = NULL; 2019 encaps_len = 0; 2020 } 2021 2022 nh_pos = skb_network_header(skb) - skb->data; 2023 h_pos = skb_transport_header(skb) - skb->data; 2024 2025 skb_pull(skb, skip_header_bytes); 2026 nh_pos -= skip_header_bytes; 2027 h_pos -= skip_header_bytes; 2028 2029 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2030 2031 /* 2032 * So we need to modify the skb header and hence need a copy of 2033 * that. The head_need variable above doesn't, so far, include 2034 * the needed header space that we don't need right away. If we 2035 * can, then we don't reallocate right now but only after the 2036 * frame arrives at the master device (if it does...) 2037 * 2038 * If we cannot, however, then we will reallocate to include all 2039 * the ever needed space. Also, if we need to reallocate it anyway, 2040 * make it big enough for everything we may ever need. 2041 */ 2042 2043 if (head_need > 0 || skb_cloned(skb)) { 2044 head_need += IEEE80211_ENCRYPT_HEADROOM; 2045 head_need += local->tx_headroom; 2046 head_need = max_t(int, 0, head_need); 2047 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 2048 goto fail; 2049 } 2050 2051 if (encaps_data) { 2052 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2053 nh_pos += encaps_len; 2054 h_pos += encaps_len; 2055 } 2056 2057 #ifdef CONFIG_MAC80211_MESH 2058 if (meshhdrlen > 0) { 2059 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2060 nh_pos += meshhdrlen; 2061 h_pos += meshhdrlen; 2062 } 2063 #endif 2064 2065 if (ieee80211_is_data_qos(fc)) { 2066 __le16 *qos_control; 2067 2068 qos_control = (__le16*) skb_push(skb, 2); 2069 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2070 /* 2071 * Maybe we could actually set some fields here, for now just 2072 * initialise to zero to indicate no special operation. 2073 */ 2074 *qos_control = 0; 2075 } else 2076 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2077 2078 nh_pos += hdrlen; 2079 h_pos += hdrlen; 2080 2081 dev->stats.tx_packets++; 2082 dev->stats.tx_bytes += skb->len; 2083 2084 /* Update skb pointers to various headers since this modified frame 2085 * is going to go through Linux networking code that may potentially 2086 * need things like pointer to IP header. */ 2087 skb_set_mac_header(skb, 0); 2088 skb_set_network_header(skb, nh_pos); 2089 skb_set_transport_header(skb, h_pos); 2090 2091 info = IEEE80211_SKB_CB(skb); 2092 memset(info, 0, sizeof(*info)); 2093 2094 dev->trans_start = jiffies; 2095 2096 info->flags = info_flags; 2097 info->ack_frame_id = info_id; 2098 2099 ieee80211_xmit(sdata, skb); 2100 2101 return NETDEV_TX_OK; 2102 2103 fail: 2104 if (ret == NETDEV_TX_OK) 2105 dev_kfree_skb(skb); 2106 2107 return ret; 2108 } 2109 2110 2111 /* 2112 * ieee80211_clear_tx_pending may not be called in a context where 2113 * it is possible that it packets could come in again. 2114 */ 2115 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2116 { 2117 int i; 2118 2119 for (i = 0; i < local->hw.queues; i++) 2120 skb_queue_purge(&local->pending[i]); 2121 } 2122 2123 /* 2124 * Returns false if the frame couldn't be transmitted but was queued instead, 2125 * which in this case means re-queued -- take as an indication to stop sending 2126 * more pending frames. 2127 */ 2128 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2129 struct sk_buff *skb) 2130 { 2131 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2132 struct ieee80211_sub_if_data *sdata; 2133 struct sta_info *sta; 2134 struct ieee80211_hdr *hdr; 2135 bool result; 2136 2137 sdata = vif_to_sdata(info->control.vif); 2138 2139 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2140 result = ieee80211_tx(sdata, skb, true); 2141 } else { 2142 struct sk_buff_head skbs; 2143 2144 __skb_queue_head_init(&skbs); 2145 __skb_queue_tail(&skbs, skb); 2146 2147 hdr = (struct ieee80211_hdr *)skb->data; 2148 sta = sta_info_get(sdata, hdr->addr1); 2149 2150 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2151 } 2152 2153 return result; 2154 } 2155 2156 /* 2157 * Transmit all pending packets. Called from tasklet. 2158 */ 2159 void ieee80211_tx_pending(unsigned long data) 2160 { 2161 struct ieee80211_local *local = (struct ieee80211_local *)data; 2162 struct ieee80211_sub_if_data *sdata; 2163 unsigned long flags; 2164 int i; 2165 bool txok; 2166 2167 rcu_read_lock(); 2168 2169 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2170 for (i = 0; i < local->hw.queues; i++) { 2171 /* 2172 * If queue is stopped by something other than due to pending 2173 * frames, or we have no pending frames, proceed to next queue. 2174 */ 2175 if (local->queue_stop_reasons[i] || 2176 skb_queue_empty(&local->pending[i])) 2177 continue; 2178 2179 while (!skb_queue_empty(&local->pending[i])) { 2180 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2182 2183 if (WARN_ON(!info->control.vif)) { 2184 kfree_skb(skb); 2185 continue; 2186 } 2187 2188 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2189 flags); 2190 2191 txok = ieee80211_tx_pending_skb(local, skb); 2192 spin_lock_irqsave(&local->queue_stop_reason_lock, 2193 flags); 2194 if (!txok) 2195 break; 2196 } 2197 2198 if (skb_queue_empty(&local->pending[i])) 2199 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2200 netif_wake_subqueue(sdata->dev, i); 2201 } 2202 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2203 2204 rcu_read_unlock(); 2205 } 2206 2207 /* functions for drivers to get certain frames */ 2208 2209 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, 2210 struct sk_buff *skb, 2211 struct beacon_data *beacon) 2212 { 2213 u8 *pos, *tim; 2214 int aid0 = 0; 2215 int i, have_bits = 0, n1, n2; 2216 2217 /* Generate bitmap for TIM only if there are any STAs in power save 2218 * mode. */ 2219 if (atomic_read(&bss->num_sta_ps) > 0) 2220 /* in the hope that this is faster than 2221 * checking byte-for-byte */ 2222 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2223 IEEE80211_MAX_AID+1); 2224 2225 if (bss->dtim_count == 0) 2226 bss->dtim_count = beacon->dtim_period - 1; 2227 else 2228 bss->dtim_count--; 2229 2230 tim = pos = (u8 *) skb_put(skb, 6); 2231 *pos++ = WLAN_EID_TIM; 2232 *pos++ = 4; 2233 *pos++ = bss->dtim_count; 2234 *pos++ = beacon->dtim_period; 2235 2236 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2237 aid0 = 1; 2238 2239 bss->dtim_bc_mc = aid0 == 1; 2240 2241 if (have_bits) { 2242 /* Find largest even number N1 so that bits numbered 1 through 2243 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2244 * (N2 + 1) x 8 through 2007 are 0. */ 2245 n1 = 0; 2246 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2247 if (bss->tim[i]) { 2248 n1 = i & 0xfe; 2249 break; 2250 } 2251 } 2252 n2 = n1; 2253 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2254 if (bss->tim[i]) { 2255 n2 = i; 2256 break; 2257 } 2258 } 2259 2260 /* Bitmap control */ 2261 *pos++ = n1 | aid0; 2262 /* Part Virt Bitmap */ 2263 skb_put(skb, n2 - n1); 2264 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2265 2266 tim[1] = n2 - n1 + 4; 2267 } else { 2268 *pos++ = aid0; /* Bitmap control */ 2269 *pos++ = 0; /* Part Virt Bitmap */ 2270 } 2271 } 2272 2273 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2274 struct ieee80211_vif *vif, 2275 u16 *tim_offset, u16 *tim_length) 2276 { 2277 struct ieee80211_local *local = hw_to_local(hw); 2278 struct sk_buff *skb = NULL; 2279 struct ieee80211_tx_info *info; 2280 struct ieee80211_sub_if_data *sdata = NULL; 2281 struct ieee80211_if_ap *ap = NULL; 2282 struct beacon_data *beacon; 2283 struct ieee80211_supported_band *sband; 2284 enum ieee80211_band band = local->hw.conf.channel->band; 2285 struct ieee80211_tx_rate_control txrc; 2286 2287 sband = local->hw.wiphy->bands[band]; 2288 2289 rcu_read_lock(); 2290 2291 sdata = vif_to_sdata(vif); 2292 2293 if (!ieee80211_sdata_running(sdata)) 2294 goto out; 2295 2296 if (tim_offset) 2297 *tim_offset = 0; 2298 if (tim_length) 2299 *tim_length = 0; 2300 2301 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2302 ap = &sdata->u.ap; 2303 beacon = rcu_dereference(ap->beacon); 2304 if (beacon) { 2305 /* 2306 * headroom, head length, 2307 * tail length and maximum TIM length 2308 */ 2309 skb = dev_alloc_skb(local->tx_headroom + 2310 beacon->head_len + 2311 beacon->tail_len + 256); 2312 if (!skb) 2313 goto out; 2314 2315 skb_reserve(skb, local->tx_headroom); 2316 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2317 beacon->head_len); 2318 2319 /* 2320 * Not very nice, but we want to allow the driver to call 2321 * ieee80211_beacon_get() as a response to the set_tim() 2322 * callback. That, however, is already invoked under the 2323 * sta_lock to guarantee consistent and race-free update 2324 * of the tim bitmap in mac80211 and the driver. 2325 */ 2326 if (local->tim_in_locked_section) { 2327 ieee80211_beacon_add_tim(ap, skb, beacon); 2328 } else { 2329 unsigned long flags; 2330 2331 spin_lock_irqsave(&local->tim_lock, flags); 2332 ieee80211_beacon_add_tim(ap, skb, beacon); 2333 spin_unlock_irqrestore(&local->tim_lock, flags); 2334 } 2335 2336 if (tim_offset) 2337 *tim_offset = beacon->head_len; 2338 if (tim_length) 2339 *tim_length = skb->len - beacon->head_len; 2340 2341 if (beacon->tail) 2342 memcpy(skb_put(skb, beacon->tail_len), 2343 beacon->tail, beacon->tail_len); 2344 } else 2345 goto out; 2346 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2347 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2348 struct ieee80211_hdr *hdr; 2349 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2350 2351 if (!presp) 2352 goto out; 2353 2354 skb = skb_copy(presp, GFP_ATOMIC); 2355 if (!skb) 2356 goto out; 2357 2358 hdr = (struct ieee80211_hdr *) skb->data; 2359 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2360 IEEE80211_STYPE_BEACON); 2361 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2362 struct ieee80211_mgmt *mgmt; 2363 u8 *pos; 2364 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2365 sizeof(mgmt->u.beacon); 2366 2367 #ifdef CONFIG_MAC80211_MESH 2368 if (!sdata->u.mesh.mesh_id_len) 2369 goto out; 2370 #endif 2371 2372 skb = dev_alloc_skb(local->tx_headroom + 2373 hdr_len + 2374 2 + /* NULL SSID */ 2375 2 + 8 + /* supported rates */ 2376 2 + 3 + /* DS params */ 2377 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2378 2 + sizeof(struct ieee80211_ht_cap) + 2379 2 + sizeof(struct ieee80211_ht_info) + 2380 2 + sdata->u.mesh.mesh_id_len + 2381 2 + sizeof(struct ieee80211_meshconf_ie) + 2382 sdata->u.mesh.ie_len); 2383 if (!skb) 2384 goto out; 2385 2386 skb_reserve(skb, local->hw.extra_tx_headroom); 2387 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2388 memset(mgmt, 0, hdr_len); 2389 mgmt->frame_control = 2390 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2391 memset(mgmt->da, 0xff, ETH_ALEN); 2392 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2393 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2394 mgmt->u.beacon.beacon_int = 2395 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2396 mgmt->u.beacon.capab_info |= cpu_to_le16( 2397 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2398 2399 pos = skb_put(skb, 2); 2400 *pos++ = WLAN_EID_SSID; 2401 *pos++ = 0x0; 2402 2403 if (ieee80211_add_srates_ie(&sdata->vif, skb) || 2404 mesh_add_ds_params_ie(skb, sdata) || 2405 ieee80211_add_ext_srates_ie(&sdata->vif, skb) || 2406 mesh_add_rsn_ie(skb, sdata) || 2407 mesh_add_ht_cap_ie(skb, sdata) || 2408 mesh_add_ht_info_ie(skb, sdata) || 2409 mesh_add_meshid_ie(skb, sdata) || 2410 mesh_add_meshconf_ie(skb, sdata) || 2411 mesh_add_vendor_ies(skb, sdata)) { 2412 pr_err("o11s: couldn't add ies!\n"); 2413 goto out; 2414 } 2415 } else { 2416 WARN_ON(1); 2417 goto out; 2418 } 2419 2420 info = IEEE80211_SKB_CB(skb); 2421 2422 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2423 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2424 info->band = band; 2425 2426 memset(&txrc, 0, sizeof(txrc)); 2427 txrc.hw = hw; 2428 txrc.sband = sband; 2429 txrc.bss_conf = &sdata->vif.bss_conf; 2430 txrc.skb = skb; 2431 txrc.reported_rate.idx = -1; 2432 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2433 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2434 txrc.max_rate_idx = -1; 2435 else 2436 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2437 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2438 sizeof(txrc.rate_idx_mcs_mask)); 2439 txrc.bss = true; 2440 rate_control_get_rate(sdata, NULL, &txrc); 2441 2442 info->control.vif = vif; 2443 2444 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2445 IEEE80211_TX_CTL_ASSIGN_SEQ | 2446 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2447 out: 2448 rcu_read_unlock(); 2449 return skb; 2450 } 2451 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2452 2453 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2454 struct ieee80211_vif *vif) 2455 { 2456 struct ieee80211_if_ap *ap = NULL; 2457 struct sk_buff *presp = NULL, *skb = NULL; 2458 struct ieee80211_hdr *hdr; 2459 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2460 2461 if (sdata->vif.type != NL80211_IFTYPE_AP) 2462 return NULL; 2463 2464 rcu_read_lock(); 2465 2466 ap = &sdata->u.ap; 2467 presp = rcu_dereference(ap->probe_resp); 2468 if (!presp) 2469 goto out; 2470 2471 skb = skb_copy(presp, GFP_ATOMIC); 2472 if (!skb) 2473 goto out; 2474 2475 hdr = (struct ieee80211_hdr *) skb->data; 2476 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2477 2478 out: 2479 rcu_read_unlock(); 2480 return skb; 2481 } 2482 EXPORT_SYMBOL(ieee80211_proberesp_get); 2483 2484 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2485 struct ieee80211_vif *vif) 2486 { 2487 struct ieee80211_sub_if_data *sdata; 2488 struct ieee80211_if_managed *ifmgd; 2489 struct ieee80211_pspoll *pspoll; 2490 struct ieee80211_local *local; 2491 struct sk_buff *skb; 2492 2493 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2494 return NULL; 2495 2496 sdata = vif_to_sdata(vif); 2497 ifmgd = &sdata->u.mgd; 2498 local = sdata->local; 2499 2500 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2501 if (!skb) 2502 return NULL; 2503 2504 skb_reserve(skb, local->hw.extra_tx_headroom); 2505 2506 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2507 memset(pspoll, 0, sizeof(*pspoll)); 2508 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2509 IEEE80211_STYPE_PSPOLL); 2510 pspoll->aid = cpu_to_le16(ifmgd->aid); 2511 2512 /* aid in PS-Poll has its two MSBs each set to 1 */ 2513 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2514 2515 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2516 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2517 2518 return skb; 2519 } 2520 EXPORT_SYMBOL(ieee80211_pspoll_get); 2521 2522 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2523 struct ieee80211_vif *vif) 2524 { 2525 struct ieee80211_hdr_3addr *nullfunc; 2526 struct ieee80211_sub_if_data *sdata; 2527 struct ieee80211_if_managed *ifmgd; 2528 struct ieee80211_local *local; 2529 struct sk_buff *skb; 2530 2531 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2532 return NULL; 2533 2534 sdata = vif_to_sdata(vif); 2535 ifmgd = &sdata->u.mgd; 2536 local = sdata->local; 2537 2538 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2539 if (!skb) 2540 return NULL; 2541 2542 skb_reserve(skb, local->hw.extra_tx_headroom); 2543 2544 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2545 sizeof(*nullfunc)); 2546 memset(nullfunc, 0, sizeof(*nullfunc)); 2547 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2548 IEEE80211_STYPE_NULLFUNC | 2549 IEEE80211_FCTL_TODS); 2550 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2551 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2552 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2553 2554 return skb; 2555 } 2556 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2557 2558 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2559 struct ieee80211_vif *vif, 2560 const u8 *ssid, size_t ssid_len, 2561 const u8 *ie, size_t ie_len) 2562 { 2563 struct ieee80211_sub_if_data *sdata; 2564 struct ieee80211_local *local; 2565 struct ieee80211_hdr_3addr *hdr; 2566 struct sk_buff *skb; 2567 size_t ie_ssid_len; 2568 u8 *pos; 2569 2570 sdata = vif_to_sdata(vif); 2571 local = sdata->local; 2572 ie_ssid_len = 2 + ssid_len; 2573 2574 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2575 ie_ssid_len + ie_len); 2576 if (!skb) 2577 return NULL; 2578 2579 skb_reserve(skb, local->hw.extra_tx_headroom); 2580 2581 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2582 memset(hdr, 0, sizeof(*hdr)); 2583 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2584 IEEE80211_STYPE_PROBE_REQ); 2585 memset(hdr->addr1, 0xff, ETH_ALEN); 2586 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2587 memset(hdr->addr3, 0xff, ETH_ALEN); 2588 2589 pos = skb_put(skb, ie_ssid_len); 2590 *pos++ = WLAN_EID_SSID; 2591 *pos++ = ssid_len; 2592 if (ssid) 2593 memcpy(pos, ssid, ssid_len); 2594 pos += ssid_len; 2595 2596 if (ie) { 2597 pos = skb_put(skb, ie_len); 2598 memcpy(pos, ie, ie_len); 2599 } 2600 2601 return skb; 2602 } 2603 EXPORT_SYMBOL(ieee80211_probereq_get); 2604 2605 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2606 const void *frame, size_t frame_len, 2607 const struct ieee80211_tx_info *frame_txctl, 2608 struct ieee80211_rts *rts) 2609 { 2610 const struct ieee80211_hdr *hdr = frame; 2611 2612 rts->frame_control = 2613 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2614 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2615 frame_txctl); 2616 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2617 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2618 } 2619 EXPORT_SYMBOL(ieee80211_rts_get); 2620 2621 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2622 const void *frame, size_t frame_len, 2623 const struct ieee80211_tx_info *frame_txctl, 2624 struct ieee80211_cts *cts) 2625 { 2626 const struct ieee80211_hdr *hdr = frame; 2627 2628 cts->frame_control = 2629 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2630 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2631 frame_len, frame_txctl); 2632 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2633 } 2634 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2635 2636 struct sk_buff * 2637 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2638 struct ieee80211_vif *vif) 2639 { 2640 struct ieee80211_local *local = hw_to_local(hw); 2641 struct sk_buff *skb = NULL; 2642 struct ieee80211_tx_data tx; 2643 struct ieee80211_sub_if_data *sdata; 2644 struct ieee80211_if_ap *bss = NULL; 2645 struct beacon_data *beacon; 2646 struct ieee80211_tx_info *info; 2647 2648 sdata = vif_to_sdata(vif); 2649 bss = &sdata->u.ap; 2650 2651 rcu_read_lock(); 2652 beacon = rcu_dereference(bss->beacon); 2653 2654 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2655 goto out; 2656 2657 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2658 goto out; /* send buffered bc/mc only after DTIM beacon */ 2659 2660 while (1) { 2661 skb = skb_dequeue(&bss->ps_bc_buf); 2662 if (!skb) 2663 goto out; 2664 local->total_ps_buffered--; 2665 2666 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2667 struct ieee80211_hdr *hdr = 2668 (struct ieee80211_hdr *) skb->data; 2669 /* more buffered multicast/broadcast frames ==> set 2670 * MoreData flag in IEEE 802.11 header to inform PS 2671 * STAs */ 2672 hdr->frame_control |= 2673 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2674 } 2675 2676 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2677 break; 2678 dev_kfree_skb_any(skb); 2679 } 2680 2681 info = IEEE80211_SKB_CB(skb); 2682 2683 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2684 tx.channel = local->hw.conf.channel; 2685 info->band = tx.channel->band; 2686 2687 if (invoke_tx_handlers(&tx)) 2688 skb = NULL; 2689 out: 2690 rcu_read_unlock(); 2691 2692 return skb; 2693 } 2694 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2695 2696 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2697 struct sk_buff *skb, int tid) 2698 { 2699 skb_set_mac_header(skb, 0); 2700 skb_set_network_header(skb, 0); 2701 skb_set_transport_header(skb, 0); 2702 2703 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 2704 skb->priority = tid; 2705 2706 /* 2707 * The other path calling ieee80211_xmit is from the tasklet, 2708 * and while we can handle concurrent transmissions locking 2709 * requirements are that we do not come into tx with bhs on. 2710 */ 2711 local_bh_disable(); 2712 ieee80211_xmit(sdata, skb); 2713 local_bh_enable(); 2714 } 2715