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 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 639 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 640 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 641 642 /* set up RTS protection if desired */ 643 if (len > tx->local->hw.wiphy->rts_threshold) { 644 txrc.rts = rts = true; 645 } 646 647 /* 648 * Use short preamble if the BSS can handle it, but not for 649 * management frames unless we know the receiver can handle 650 * that -- the management frame might be to a station that 651 * just wants a probe response. 652 */ 653 if (tx->sdata->vif.bss_conf.use_short_preamble && 654 (ieee80211_is_data(hdr->frame_control) || 655 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 656 txrc.short_preamble = short_preamble = true; 657 658 if (tx->sta) 659 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 660 661 /* 662 * Lets not bother rate control if we're associated and cannot 663 * talk to the sta. This should not happen. 664 */ 665 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 666 !rate_usable_index_exists(sband, &tx->sta->sta), 667 "%s: Dropped data frame as no usable bitrate found while " 668 "scanning and associated. Target station: " 669 "%pM on %d GHz band\n", 670 tx->sdata->name, hdr->addr1, 671 tx->channel->band ? 5 : 2)) 672 return TX_DROP; 673 674 /* 675 * If we're associated with the sta at this point we know we can at 676 * least send the frame at the lowest bit rate. 677 */ 678 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 679 680 if (unlikely(info->control.rates[0].idx < 0)) 681 return TX_DROP; 682 683 if (txrc.reported_rate.idx < 0) { 684 txrc.reported_rate = info->control.rates[0]; 685 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 686 tx->sta->last_tx_rate = txrc.reported_rate; 687 } else if (tx->sta) 688 tx->sta->last_tx_rate = txrc.reported_rate; 689 690 if (unlikely(!info->control.rates[0].count)) 691 info->control.rates[0].count = 1; 692 693 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 694 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 695 info->control.rates[0].count = 1; 696 697 if (is_multicast_ether_addr(hdr->addr1)) { 698 /* 699 * XXX: verify the rate is in the basic rateset 700 */ 701 return TX_CONTINUE; 702 } 703 704 /* 705 * set up the RTS/CTS rate as the fastest basic rate 706 * that is not faster than the data rate 707 * 708 * XXX: Should this check all retry rates? 709 */ 710 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 711 s8 baserate = 0; 712 713 rate = &sband->bitrates[info->control.rates[0].idx]; 714 715 for (i = 0; i < sband->n_bitrates; i++) { 716 /* must be a basic rate */ 717 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 718 continue; 719 /* must not be faster than the data rate */ 720 if (sband->bitrates[i].bitrate > rate->bitrate) 721 continue; 722 /* maximum */ 723 if (sband->bitrates[baserate].bitrate < 724 sband->bitrates[i].bitrate) 725 baserate = i; 726 } 727 728 info->control.rts_cts_rate_idx = baserate; 729 } 730 731 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 732 /* 733 * make sure there's no valid rate following 734 * an invalid one, just in case drivers don't 735 * take the API seriously to stop at -1. 736 */ 737 if (inval) { 738 info->control.rates[i].idx = -1; 739 continue; 740 } 741 if (info->control.rates[i].idx < 0) { 742 inval = true; 743 continue; 744 } 745 746 /* 747 * For now assume MCS is already set up correctly, this 748 * needs to be fixed. 749 */ 750 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 751 WARN_ON(info->control.rates[i].idx > 76); 752 continue; 753 } 754 755 /* set up RTS protection if desired */ 756 if (rts) 757 info->control.rates[i].flags |= 758 IEEE80211_TX_RC_USE_RTS_CTS; 759 760 /* RC is busted */ 761 if (WARN_ON_ONCE(info->control.rates[i].idx >= 762 sband->n_bitrates)) { 763 info->control.rates[i].idx = -1; 764 continue; 765 } 766 767 rate = &sband->bitrates[info->control.rates[i].idx]; 768 769 /* set up short preamble */ 770 if (short_preamble && 771 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 772 info->control.rates[i].flags |= 773 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 774 775 /* set up G protection */ 776 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 777 rate->flags & IEEE80211_RATE_ERP_G) 778 info->control.rates[i].flags |= 779 IEEE80211_TX_RC_USE_CTS_PROTECT; 780 } 781 782 return TX_CONTINUE; 783 } 784 785 static ieee80211_tx_result debug_noinline 786 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 787 { 788 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 790 u16 *seq; 791 u8 *qc; 792 int tid; 793 794 /* 795 * Packet injection may want to control the sequence 796 * number, if we have no matching interface then we 797 * neither assign one ourselves nor ask the driver to. 798 */ 799 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 800 return TX_CONTINUE; 801 802 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 803 return TX_CONTINUE; 804 805 if (ieee80211_hdrlen(hdr->frame_control) < 24) 806 return TX_CONTINUE; 807 808 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 809 return TX_CONTINUE; 810 811 /* 812 * Anything but QoS data that has a sequence number field 813 * (is long enough) gets a sequence number from the global 814 * counter. 815 */ 816 if (!ieee80211_is_data_qos(hdr->frame_control)) { 817 /* driver should assign sequence number */ 818 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 819 /* for pure STA mode without beacons, we can do it */ 820 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 821 tx->sdata->sequence_number += 0x10; 822 return TX_CONTINUE; 823 } 824 825 /* 826 * This should be true for injected/management frames only, for 827 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 828 * above since they are not QoS-data frames. 829 */ 830 if (!tx->sta) 831 return TX_CONTINUE; 832 833 /* include per-STA, per-TID sequence counter */ 834 835 qc = ieee80211_get_qos_ctl(hdr); 836 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 837 seq = &tx->sta->tid_seq[tid]; 838 839 hdr->seq_ctrl = cpu_to_le16(*seq); 840 841 /* Increase the sequence number. */ 842 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 843 844 return TX_CONTINUE; 845 } 846 847 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 848 struct sk_buff *skb, int hdrlen, 849 int frag_threshold) 850 { 851 struct ieee80211_local *local = tx->local; 852 struct ieee80211_tx_info *info; 853 struct sk_buff *tmp; 854 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 855 int pos = hdrlen + per_fragm; 856 int rem = skb->len - hdrlen - per_fragm; 857 858 if (WARN_ON(rem < 0)) 859 return -EINVAL; 860 861 /* first fragment was already added to queue by caller */ 862 863 while (rem) { 864 int fraglen = per_fragm; 865 866 if (fraglen > rem) 867 fraglen = rem; 868 rem -= fraglen; 869 tmp = dev_alloc_skb(local->tx_headroom + 870 frag_threshold + 871 IEEE80211_ENCRYPT_HEADROOM + 872 IEEE80211_ENCRYPT_TAILROOM); 873 if (!tmp) 874 return -ENOMEM; 875 876 __skb_queue_tail(&tx->skbs, tmp); 877 878 skb_reserve(tmp, local->tx_headroom + 879 IEEE80211_ENCRYPT_HEADROOM); 880 /* copy control information */ 881 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 882 883 info = IEEE80211_SKB_CB(tmp); 884 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 885 IEEE80211_TX_CTL_FIRST_FRAGMENT); 886 887 if (rem) 888 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 889 890 skb_copy_queue_mapping(tmp, skb); 891 tmp->priority = skb->priority; 892 tmp->dev = skb->dev; 893 894 /* copy header and data */ 895 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 896 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 897 898 pos += fraglen; 899 } 900 901 /* adjust first fragment's length */ 902 skb->len = hdrlen + per_fragm; 903 return 0; 904 } 905 906 static ieee80211_tx_result debug_noinline 907 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 908 { 909 struct sk_buff *skb = tx->skb; 910 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 911 struct ieee80211_hdr *hdr = (void *)skb->data; 912 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 913 int hdrlen; 914 int fragnum; 915 916 /* no matter what happens, tx->skb moves to tx->skbs */ 917 __skb_queue_tail(&tx->skbs, skb); 918 tx->skb = NULL; 919 920 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 921 return TX_CONTINUE; 922 923 if (tx->local->ops->set_frag_threshold) 924 return TX_CONTINUE; 925 926 /* 927 * Warn when submitting a fragmented A-MPDU frame and drop it. 928 * This scenario is handled in ieee80211_tx_prepare but extra 929 * caution taken here as fragmented ampdu may cause Tx stop. 930 */ 931 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 932 return TX_DROP; 933 934 hdrlen = ieee80211_hdrlen(hdr->frame_control); 935 936 /* internal error, why isn't DONTFRAG set? */ 937 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 938 return TX_DROP; 939 940 /* 941 * Now fragment the frame. This will allocate all the fragments and 942 * chain them (using skb as the first fragment) to skb->next. 943 * During transmission, we will remove the successfully transmitted 944 * fragments from this list. When the low-level driver rejects one 945 * of the fragments then we will simply pretend to accept the skb 946 * but store it away as pending. 947 */ 948 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 949 return TX_DROP; 950 951 /* update duration/seq/flags of fragments */ 952 fragnum = 0; 953 954 skb_queue_walk(&tx->skbs, skb) { 955 int next_len; 956 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 957 958 hdr = (void *)skb->data; 959 info = IEEE80211_SKB_CB(skb); 960 961 if (!skb_queue_is_last(&tx->skbs, skb)) { 962 hdr->frame_control |= morefrags; 963 /* 964 * No multi-rate retries for fragmented frames, that 965 * would completely throw off the NAV at other STAs. 966 */ 967 info->control.rates[1].idx = -1; 968 info->control.rates[2].idx = -1; 969 info->control.rates[3].idx = -1; 970 info->control.rates[4].idx = -1; 971 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 972 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 973 } else { 974 hdr->frame_control &= ~morefrags; 975 next_len = 0; 976 } 977 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 978 fragnum++; 979 } 980 981 return TX_CONTINUE; 982 } 983 984 static ieee80211_tx_result debug_noinline 985 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 986 { 987 struct sk_buff *skb; 988 989 if (!tx->sta) 990 return TX_CONTINUE; 991 992 tx->sta->tx_packets++; 993 skb_queue_walk(&tx->skbs, skb) { 994 tx->sta->tx_fragments++; 995 tx->sta->tx_bytes += skb->len; 996 } 997 998 return TX_CONTINUE; 999 } 1000 1001 static ieee80211_tx_result debug_noinline 1002 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1003 { 1004 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1005 1006 if (!tx->key) 1007 return TX_CONTINUE; 1008 1009 switch (tx->key->conf.cipher) { 1010 case WLAN_CIPHER_SUITE_WEP40: 1011 case WLAN_CIPHER_SUITE_WEP104: 1012 return ieee80211_crypto_wep_encrypt(tx); 1013 case WLAN_CIPHER_SUITE_TKIP: 1014 return ieee80211_crypto_tkip_encrypt(tx); 1015 case WLAN_CIPHER_SUITE_CCMP: 1016 return ieee80211_crypto_ccmp_encrypt(tx); 1017 case WLAN_CIPHER_SUITE_AES_CMAC: 1018 return ieee80211_crypto_aes_cmac_encrypt(tx); 1019 default: 1020 /* handle hw-only algorithm */ 1021 if (info->control.hw_key) { 1022 ieee80211_tx_set_protected(tx); 1023 return TX_CONTINUE; 1024 } 1025 break; 1026 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 1069 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1070 info->flags |= IEEE80211_TX_CTL_AMPDU; 1071 reset_agg_timer = true; 1072 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1073 /* 1074 * nothing -- this aggregation session is being started 1075 * but that might still fail with the driver 1076 */ 1077 } else { 1078 spin_lock(&tx->sta->lock); 1079 /* 1080 * Need to re-check now, because we may get here 1081 * 1082 * 1) in the window during which the setup is actually 1083 * already done, but not marked yet because not all 1084 * packets are spliced over to the driver pending 1085 * queue yet -- if this happened we acquire the lock 1086 * either before or after the splice happens, but 1087 * need to recheck which of these cases happened. 1088 * 1089 * 2) during session teardown, if the OPERATIONAL bit 1090 * was cleared due to the teardown but the pointer 1091 * hasn't been assigned NULL yet (or we loaded it 1092 * before it was assigned) -- in this case it may 1093 * now be NULL which means we should just let the 1094 * packet pass through because splicing the frames 1095 * back is already done. 1096 */ 1097 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1098 1099 if (!tid_tx) { 1100 /* do nothing, let packet pass through */ 1101 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1102 info->flags |= IEEE80211_TX_CTL_AMPDU; 1103 reset_agg_timer = true; 1104 } else { 1105 queued = true; 1106 info->control.vif = &tx->sdata->vif; 1107 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1108 __skb_queue_tail(&tid_tx->pending, skb); 1109 } 1110 spin_unlock(&tx->sta->lock); 1111 } 1112 1113 /* reset session timer */ 1114 if (reset_agg_timer && tid_tx->timeout) 1115 mod_timer(&tid_tx->session_timer, 1116 TU_TO_EXP_TIME(tid_tx->timeout)); 1117 1118 return queued; 1119 } 1120 1121 /* 1122 * initialises @tx 1123 */ 1124 static ieee80211_tx_result 1125 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1126 struct ieee80211_tx_data *tx, 1127 struct sk_buff *skb) 1128 { 1129 struct ieee80211_local *local = sdata->local; 1130 struct ieee80211_hdr *hdr; 1131 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1132 int tid; 1133 u8 *qc; 1134 1135 memset(tx, 0, sizeof(*tx)); 1136 tx->skb = skb; 1137 tx->local = local; 1138 tx->sdata = sdata; 1139 tx->channel = local->hw.conf.channel; 1140 __skb_queue_head_init(&tx->skbs); 1141 1142 /* 1143 * If this flag is set to true anywhere, and we get here, 1144 * we are doing the needed processing, so remove the flag 1145 * now. 1146 */ 1147 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1148 1149 hdr = (struct ieee80211_hdr *) skb->data; 1150 1151 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1152 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1153 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1154 return TX_DROP; 1155 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) { 1156 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1157 } 1158 if (!tx->sta) 1159 tx->sta = sta_info_get(sdata, hdr->addr1); 1160 1161 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1162 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1163 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1164 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1165 struct tid_ampdu_tx *tid_tx; 1166 1167 qc = ieee80211_get_qos_ctl(hdr); 1168 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1169 1170 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1171 if (tid_tx) { 1172 bool queued; 1173 1174 queued = ieee80211_tx_prep_agg(tx, skb, info, 1175 tid_tx, tid); 1176 1177 if (unlikely(queued)) 1178 return TX_QUEUED; 1179 } 1180 } 1181 1182 if (is_multicast_ether_addr(hdr->addr1)) { 1183 tx->flags &= ~IEEE80211_TX_UNICAST; 1184 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1185 } else 1186 tx->flags |= IEEE80211_TX_UNICAST; 1187 1188 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1189 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1190 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1191 info->flags & IEEE80211_TX_CTL_AMPDU) 1192 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1193 } 1194 1195 if (!tx->sta) 1196 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1197 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1198 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1199 1200 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1201 1202 return TX_CONTINUE; 1203 } 1204 1205 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1206 struct ieee80211_vif *vif, 1207 struct ieee80211_sta *sta, 1208 struct sk_buff_head *skbs, 1209 bool txpending) 1210 { 1211 struct sk_buff *skb, *tmp; 1212 struct ieee80211_tx_info *info; 1213 unsigned long flags; 1214 1215 skb_queue_walk_safe(skbs, skb, tmp) { 1216 int q = skb_get_queue_mapping(skb); 1217 1218 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1219 if (local->queue_stop_reasons[q] || 1220 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1221 /* 1222 * Since queue is stopped, queue up frames for later 1223 * transmission from the tx-pending tasklet when the 1224 * queue is woken again. 1225 */ 1226 if (txpending) 1227 skb_queue_splice_init(skbs, &local->pending[q]); 1228 else 1229 skb_queue_splice_tail_init(skbs, 1230 &local->pending[q]); 1231 1232 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1233 flags); 1234 return false; 1235 } 1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1237 1238 info = IEEE80211_SKB_CB(skb); 1239 info->control.vif = vif; 1240 info->control.sta = sta; 1241 1242 __skb_unlink(skb, skbs); 1243 drv_tx(local, skb); 1244 } 1245 1246 return true; 1247 } 1248 1249 /* 1250 * Returns false if the frame couldn't be transmitted but was queued instead. 1251 */ 1252 static bool __ieee80211_tx(struct ieee80211_local *local, 1253 struct sk_buff_head *skbs, int led_len, 1254 struct sta_info *sta, bool txpending) 1255 { 1256 struct ieee80211_tx_info *info; 1257 struct ieee80211_sub_if_data *sdata; 1258 struct ieee80211_vif *vif; 1259 struct ieee80211_sta *pubsta; 1260 struct sk_buff *skb; 1261 bool result = true; 1262 __le16 fc; 1263 1264 if (WARN_ON(skb_queue_empty(skbs))) 1265 return true; 1266 1267 skb = skb_peek(skbs); 1268 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1269 info = IEEE80211_SKB_CB(skb); 1270 sdata = vif_to_sdata(info->control.vif); 1271 if (sta && !sta->uploaded) 1272 sta = NULL; 1273 1274 if (sta) 1275 pubsta = &sta->sta; 1276 else 1277 pubsta = NULL; 1278 1279 switch (sdata->vif.type) { 1280 case NL80211_IFTYPE_MONITOR: 1281 sdata = NULL; 1282 vif = NULL; 1283 break; 1284 case NL80211_IFTYPE_AP_VLAN: 1285 sdata = container_of(sdata->bss, 1286 struct ieee80211_sub_if_data, u.ap); 1287 /* fall through */ 1288 default: 1289 vif = &sdata->vif; 1290 break; 1291 } 1292 1293 if (local->ops->tx_frags) 1294 drv_tx_frags(local, vif, pubsta, skbs); 1295 else 1296 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1297 txpending); 1298 1299 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1300 ieee80211_led_tx(local, 1); 1301 1302 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1303 1304 return result; 1305 } 1306 1307 /* 1308 * Invoke TX handlers, return 0 on success and non-zero if the 1309 * frame was dropped or queued. 1310 */ 1311 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1312 { 1313 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1314 ieee80211_tx_result res = TX_DROP; 1315 1316 #define CALL_TXH(txh) \ 1317 do { \ 1318 res = txh(tx); \ 1319 if (res != TX_CONTINUE) \ 1320 goto txh_done; \ 1321 } while (0) 1322 1323 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1324 CALL_TXH(ieee80211_tx_h_check_assoc); 1325 CALL_TXH(ieee80211_tx_h_ps_buf); 1326 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1327 CALL_TXH(ieee80211_tx_h_select_key); 1328 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1329 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1330 1331 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1332 __skb_queue_tail(&tx->skbs, tx->skb); 1333 tx->skb = NULL; 1334 goto txh_done; 1335 } 1336 1337 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1338 CALL_TXH(ieee80211_tx_h_sequence); 1339 CALL_TXH(ieee80211_tx_h_fragment); 1340 /* handlers after fragment must be aware of tx info fragmentation! */ 1341 CALL_TXH(ieee80211_tx_h_stats); 1342 CALL_TXH(ieee80211_tx_h_encrypt); 1343 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1344 CALL_TXH(ieee80211_tx_h_calculate_duration); 1345 #undef CALL_TXH 1346 1347 txh_done: 1348 if (unlikely(res == TX_DROP)) { 1349 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1350 if (tx->skb) 1351 dev_kfree_skb(tx->skb); 1352 else 1353 __skb_queue_purge(&tx->skbs); 1354 return -1; 1355 } else if (unlikely(res == TX_QUEUED)) { 1356 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1357 return -1; 1358 } 1359 1360 return 0; 1361 } 1362 1363 /* 1364 * Returns false if the frame couldn't be transmitted but was queued instead. 1365 */ 1366 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1367 struct sk_buff *skb, bool txpending) 1368 { 1369 struct ieee80211_local *local = sdata->local; 1370 struct ieee80211_tx_data tx; 1371 ieee80211_tx_result res_prepare; 1372 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1373 bool result = true; 1374 int led_len; 1375 1376 if (unlikely(skb->len < 10)) { 1377 dev_kfree_skb(skb); 1378 return true; 1379 } 1380 1381 rcu_read_lock(); 1382 1383 /* initialises tx */ 1384 led_len = skb->len; 1385 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1386 1387 if (unlikely(res_prepare == TX_DROP)) { 1388 dev_kfree_skb(skb); 1389 goto out; 1390 } else if (unlikely(res_prepare == TX_QUEUED)) { 1391 goto out; 1392 } 1393 1394 tx.channel = local->hw.conf.channel; 1395 info->band = tx.channel->band; 1396 1397 if (!invoke_tx_handlers(&tx)) 1398 result = __ieee80211_tx(local, &tx.skbs, led_len, 1399 tx.sta, txpending); 1400 out: 1401 rcu_read_unlock(); 1402 return result; 1403 } 1404 1405 /* device xmit handlers */ 1406 1407 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1408 struct sk_buff *skb, 1409 int head_need, bool may_encrypt) 1410 { 1411 struct ieee80211_local *local = sdata->local; 1412 int tail_need = 0; 1413 1414 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1415 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1416 tail_need -= skb_tailroom(skb); 1417 tail_need = max_t(int, tail_need, 0); 1418 } 1419 1420 if (skb_cloned(skb)) 1421 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1422 else if (head_need || tail_need) 1423 I802_DEBUG_INC(local->tx_expand_skb_head); 1424 else 1425 return 0; 1426 1427 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1428 wiphy_debug(local->hw.wiphy, 1429 "failed to reallocate TX buffer\n"); 1430 return -ENOMEM; 1431 } 1432 1433 return 0; 1434 } 1435 1436 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1437 { 1438 struct ieee80211_local *local = sdata->local; 1439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1441 int headroom; 1442 bool may_encrypt; 1443 1444 rcu_read_lock(); 1445 1446 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1447 1448 headroom = local->tx_headroom; 1449 if (may_encrypt) 1450 headroom += IEEE80211_ENCRYPT_HEADROOM; 1451 headroom -= skb_headroom(skb); 1452 headroom = max_t(int, 0, headroom); 1453 1454 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1455 dev_kfree_skb(skb); 1456 rcu_read_unlock(); 1457 return; 1458 } 1459 1460 hdr = (struct ieee80211_hdr *) skb->data; 1461 info->control.vif = &sdata->vif; 1462 1463 if (ieee80211_vif_is_mesh(&sdata->vif) && 1464 ieee80211_is_data(hdr->frame_control) && 1465 !is_multicast_ether_addr(hdr->addr1)) 1466 if (mesh_nexthop_resolve(skb, sdata)) { 1467 /* skb queued: don't free */ 1468 rcu_read_unlock(); 1469 return; 1470 } 1471 1472 ieee80211_set_qos_hdr(sdata, skb); 1473 ieee80211_tx(sdata, skb, false); 1474 rcu_read_unlock(); 1475 } 1476 1477 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1478 { 1479 struct ieee80211_radiotap_iterator iterator; 1480 struct ieee80211_radiotap_header *rthdr = 1481 (struct ieee80211_radiotap_header *) skb->data; 1482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1483 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1484 NULL); 1485 u16 txflags; 1486 1487 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1488 IEEE80211_TX_CTL_DONTFRAG; 1489 1490 /* 1491 * for every radiotap entry that is present 1492 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1493 * entries present, or -EINVAL on error) 1494 */ 1495 1496 while (!ret) { 1497 ret = ieee80211_radiotap_iterator_next(&iterator); 1498 1499 if (ret) 1500 continue; 1501 1502 /* see if this argument is something we can use */ 1503 switch (iterator.this_arg_index) { 1504 /* 1505 * You must take care when dereferencing iterator.this_arg 1506 * for multibyte types... the pointer is not aligned. Use 1507 * get_unaligned((type *)iterator.this_arg) to dereference 1508 * iterator.this_arg for type "type" safely on all arches. 1509 */ 1510 case IEEE80211_RADIOTAP_FLAGS: 1511 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1512 /* 1513 * this indicates that the skb we have been 1514 * handed has the 32-bit FCS CRC at the end... 1515 * we should react to that by snipping it off 1516 * because it will be recomputed and added 1517 * on transmission 1518 */ 1519 if (skb->len < (iterator._max_length + FCS_LEN)) 1520 return false; 1521 1522 skb_trim(skb, skb->len - FCS_LEN); 1523 } 1524 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1525 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1526 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1527 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1528 break; 1529 1530 case IEEE80211_RADIOTAP_TX_FLAGS: 1531 txflags = get_unaligned_le16(iterator.this_arg); 1532 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1533 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1534 break; 1535 1536 /* 1537 * Please update the file 1538 * Documentation/networking/mac80211-injection.txt 1539 * when parsing new fields here. 1540 */ 1541 1542 default: 1543 break; 1544 } 1545 } 1546 1547 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1548 return false; 1549 1550 /* 1551 * remove the radiotap header 1552 * iterator->_max_length was sanity-checked against 1553 * skb->len by iterator init 1554 */ 1555 skb_pull(skb, iterator._max_length); 1556 1557 return true; 1558 } 1559 1560 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1561 struct net_device *dev) 1562 { 1563 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1564 struct ieee80211_channel *chan = local->hw.conf.channel; 1565 struct ieee80211_radiotap_header *prthdr = 1566 (struct ieee80211_radiotap_header *)skb->data; 1567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1568 struct ieee80211_hdr *hdr; 1569 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1570 u16 len_rthdr; 1571 int hdrlen; 1572 1573 /* 1574 * Frame injection is not allowed if beaconing is not allowed 1575 * or if we need radar detection. Beaconing is usually not allowed when 1576 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1577 * Passive scan is also used in world regulatory domains where 1578 * your country is not known and as such it should be treated as 1579 * NO TX unless the channel is explicitly allowed in which case 1580 * your current regulatory domain would not have the passive scan 1581 * flag. 1582 * 1583 * Since AP mode uses monitor interfaces to inject/TX management 1584 * frames we can make AP mode the exception to this rule once it 1585 * supports radar detection as its implementation can deal with 1586 * radar detection by itself. We can do that later by adding a 1587 * monitor flag interfaces used for AP support. 1588 */ 1589 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1590 IEEE80211_CHAN_PASSIVE_SCAN))) 1591 goto fail; 1592 1593 /* check for not even having the fixed radiotap header part */ 1594 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1595 goto fail; /* too short to be possibly valid */ 1596 1597 /* is it a header version we can trust to find length from? */ 1598 if (unlikely(prthdr->it_version)) 1599 goto fail; /* only version 0 is supported */ 1600 1601 /* then there must be a radiotap header with a length we can use */ 1602 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1603 1604 /* does the skb contain enough to deliver on the alleged length? */ 1605 if (unlikely(skb->len < len_rthdr)) 1606 goto fail; /* skb too short for claimed rt header extent */ 1607 1608 /* 1609 * fix up the pointers accounting for the radiotap 1610 * header still being in there. We are being given 1611 * a precooked IEEE80211 header so no need for 1612 * normal processing 1613 */ 1614 skb_set_mac_header(skb, len_rthdr); 1615 /* 1616 * these are just fixed to the end of the rt area since we 1617 * don't have any better information and at this point, nobody cares 1618 */ 1619 skb_set_network_header(skb, len_rthdr); 1620 skb_set_transport_header(skb, len_rthdr); 1621 1622 if (skb->len < len_rthdr + 2) 1623 goto fail; 1624 1625 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1626 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1627 1628 if (skb->len < len_rthdr + hdrlen) 1629 goto fail; 1630 1631 /* 1632 * Initialize skb->protocol if the injected frame is a data frame 1633 * carrying a rfc1042 header 1634 */ 1635 if (ieee80211_is_data(hdr->frame_control) && 1636 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1637 u8 *payload = (u8 *)hdr + hdrlen; 1638 1639 if (compare_ether_addr(payload, rfc1042_header) == 0) 1640 skb->protocol = cpu_to_be16((payload[6] << 8) | 1641 payload[7]); 1642 } 1643 1644 memset(info, 0, sizeof(*info)); 1645 1646 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1647 IEEE80211_TX_CTL_INJECTED; 1648 1649 /* process and remove the injection radiotap header */ 1650 if (!ieee80211_parse_tx_radiotap(skb)) 1651 goto fail; 1652 1653 rcu_read_lock(); 1654 1655 /* 1656 * We process outgoing injected frames that have a local address 1657 * we handle as though they are non-injected frames. 1658 * This code here isn't entirely correct, the local MAC address 1659 * isn't always enough to find the interface to use; for proper 1660 * VLAN/WDS support we will need a different mechanism (which 1661 * likely isn't going to be monitor interfaces). 1662 */ 1663 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1664 1665 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1666 if (!ieee80211_sdata_running(tmp_sdata)) 1667 continue; 1668 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1669 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1670 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1671 continue; 1672 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) { 1673 sdata = tmp_sdata; 1674 break; 1675 } 1676 } 1677 1678 ieee80211_xmit(sdata, skb); 1679 rcu_read_unlock(); 1680 1681 return NETDEV_TX_OK; 1682 1683 fail: 1684 dev_kfree_skb(skb); 1685 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1686 } 1687 1688 /** 1689 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1690 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1691 * @skb: packet to be sent 1692 * @dev: incoming interface 1693 * 1694 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1695 * not be freed, and caller is responsible for either retrying later or freeing 1696 * skb). 1697 * 1698 * This function takes in an Ethernet header and encapsulates it with suitable 1699 * IEEE 802.11 header based on which interface the packet is coming in. The 1700 * encapsulated packet will then be passed to master interface, wlan#.11, for 1701 * transmission (through low-level driver). 1702 */ 1703 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1704 struct net_device *dev) 1705 { 1706 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1707 struct ieee80211_local *local = sdata->local; 1708 struct ieee80211_tx_info *info; 1709 int ret = NETDEV_TX_BUSY, head_need; 1710 u16 ethertype, hdrlen, meshhdrlen = 0; 1711 __le16 fc; 1712 struct ieee80211_hdr hdr; 1713 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1714 struct mesh_path __maybe_unused *mppath = NULL; 1715 const u8 *encaps_data; 1716 int encaps_len, skip_header_bytes; 1717 int nh_pos, h_pos; 1718 struct sta_info *sta = NULL; 1719 bool wme_sta = false, authorized = false, tdls_auth = false; 1720 bool tdls_direct = false; 1721 bool multicast; 1722 u32 info_flags = 0; 1723 u16 info_id = 0; 1724 1725 if (unlikely(skb->len < ETH_HLEN)) { 1726 ret = NETDEV_TX_OK; 1727 goto fail; 1728 } 1729 1730 /* convert Ethernet header to proper 802.11 header (based on 1731 * operation mode) */ 1732 ethertype = (skb->data[12] << 8) | skb->data[13]; 1733 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1734 1735 switch (sdata->vif.type) { 1736 case NL80211_IFTYPE_AP_VLAN: 1737 rcu_read_lock(); 1738 sta = rcu_dereference(sdata->u.vlan.sta); 1739 if (sta) { 1740 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1741 /* RA TA DA SA */ 1742 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1743 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1744 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1745 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1746 hdrlen = 30; 1747 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1748 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1749 } 1750 rcu_read_unlock(); 1751 if (sta) 1752 break; 1753 /* fall through */ 1754 case NL80211_IFTYPE_AP: 1755 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1756 /* DA BSSID SA */ 1757 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1758 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1759 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1760 hdrlen = 24; 1761 break; 1762 case NL80211_IFTYPE_WDS: 1763 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1764 /* RA TA DA SA */ 1765 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1766 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1767 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1768 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1769 hdrlen = 30; 1770 break; 1771 #ifdef CONFIG_MAC80211_MESH 1772 case NL80211_IFTYPE_MESH_POINT: 1773 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1774 /* Do not send frames with mesh_ttl == 0 */ 1775 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1776 ret = NETDEV_TX_OK; 1777 goto fail; 1778 } 1779 rcu_read_lock(); 1780 if (!is_multicast_ether_addr(skb->data)) 1781 mppath = mpp_path_lookup(skb->data, sdata); 1782 1783 /* 1784 * Use address extension if it is a packet from 1785 * another interface or if we know the destination 1786 * is being proxied by a portal (i.e. portal address 1787 * differs from proxied address) 1788 */ 1789 if (compare_ether_addr(sdata->vif.addr, 1790 skb->data + ETH_ALEN) == 0 && 1791 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { 1792 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1793 skb->data, skb->data + ETH_ALEN); 1794 rcu_read_unlock(); 1795 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1796 sdata, NULL, NULL); 1797 } else { 1798 int is_mesh_mcast = 1; 1799 const u8 *mesh_da; 1800 1801 if (is_multicast_ether_addr(skb->data)) 1802 /* DA TA mSA AE:SA */ 1803 mesh_da = skb->data; 1804 else { 1805 static const u8 bcast[ETH_ALEN] = 1806 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1807 if (mppath) { 1808 /* RA TA mDA mSA AE:DA SA */ 1809 mesh_da = mppath->mpp; 1810 is_mesh_mcast = 0; 1811 } else { 1812 /* DA TA mSA AE:SA */ 1813 mesh_da = bcast; 1814 } 1815 } 1816 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1817 mesh_da, sdata->vif.addr); 1818 rcu_read_unlock(); 1819 if (is_mesh_mcast) 1820 meshhdrlen = 1821 ieee80211_new_mesh_header(&mesh_hdr, 1822 sdata, 1823 skb->data + ETH_ALEN, 1824 NULL); 1825 else 1826 meshhdrlen = 1827 ieee80211_new_mesh_header(&mesh_hdr, 1828 sdata, 1829 skb->data, 1830 skb->data + ETH_ALEN); 1831 1832 } 1833 break; 1834 #endif 1835 case NL80211_IFTYPE_STATION: 1836 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1837 bool tdls_peer = false; 1838 1839 rcu_read_lock(); 1840 sta = sta_info_get(sdata, skb->data); 1841 if (sta) { 1842 authorized = test_sta_flag(sta, 1843 WLAN_STA_AUTHORIZED); 1844 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1845 tdls_peer = test_sta_flag(sta, 1846 WLAN_STA_TDLS_PEER); 1847 tdls_auth = test_sta_flag(sta, 1848 WLAN_STA_TDLS_PEER_AUTH); 1849 } 1850 rcu_read_unlock(); 1851 1852 /* 1853 * If the TDLS link is enabled, send everything 1854 * directly. Otherwise, allow TDLS setup frames 1855 * to be transmitted indirectly. 1856 */ 1857 tdls_direct = tdls_peer && (tdls_auth || 1858 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1859 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1860 } 1861 1862 if (tdls_direct) { 1863 /* link during setup - throw out frames to peer */ 1864 if (!tdls_auth) { 1865 ret = NETDEV_TX_OK; 1866 goto fail; 1867 } 1868 1869 /* DA SA BSSID */ 1870 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1871 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1872 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1873 hdrlen = 24; 1874 } else if (sdata->u.mgd.use_4addr && 1875 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1876 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1877 IEEE80211_FCTL_TODS); 1878 /* RA TA DA SA */ 1879 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1880 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1881 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1882 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1883 hdrlen = 30; 1884 } else { 1885 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1886 /* BSSID SA DA */ 1887 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1888 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1889 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1890 hdrlen = 24; 1891 } 1892 break; 1893 case NL80211_IFTYPE_ADHOC: 1894 /* DA SA BSSID */ 1895 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1896 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1897 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1898 hdrlen = 24; 1899 break; 1900 default: 1901 ret = NETDEV_TX_OK; 1902 goto fail; 1903 } 1904 1905 /* 1906 * There's no need to try to look up the destination 1907 * if it is a multicast address (which can only happen 1908 * in AP mode) 1909 */ 1910 multicast = is_multicast_ether_addr(hdr.addr1); 1911 if (!multicast) { 1912 rcu_read_lock(); 1913 sta = sta_info_get(sdata, hdr.addr1); 1914 if (sta) { 1915 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1916 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1917 } 1918 rcu_read_unlock(); 1919 } 1920 1921 /* For mesh, the use of the QoS header is mandatory */ 1922 if (ieee80211_vif_is_mesh(&sdata->vif)) 1923 wme_sta = true; 1924 1925 /* receiver and we are QoS enabled, use a QoS type frame */ 1926 if (wme_sta && local->hw.queues >= 4) { 1927 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1928 hdrlen += 2; 1929 } 1930 1931 /* 1932 * Drop unicast frames to unauthorised stations unless they are 1933 * EAPOL frames from the local station. 1934 */ 1935 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1936 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1937 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1938 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1939 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1940 if (net_ratelimit()) 1941 printk(KERN_DEBUG "%s: dropped frame to %pM" 1942 " (unauthorized port)\n", dev->name, 1943 hdr.addr1); 1944 #endif 1945 1946 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1947 1948 ret = NETDEV_TX_OK; 1949 goto fail; 1950 } 1951 1952 if (unlikely(!multicast && skb->sk && 1953 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1954 struct sk_buff *orig_skb = skb; 1955 1956 skb = skb_clone(skb, GFP_ATOMIC); 1957 if (skb) { 1958 unsigned long flags; 1959 int id, r; 1960 1961 spin_lock_irqsave(&local->ack_status_lock, flags); 1962 r = idr_get_new_above(&local->ack_status_frames, 1963 orig_skb, 1, &id); 1964 if (r == -EAGAIN) { 1965 idr_pre_get(&local->ack_status_frames, 1966 GFP_ATOMIC); 1967 r = idr_get_new_above(&local->ack_status_frames, 1968 orig_skb, 1, &id); 1969 } 1970 if (WARN_ON(!id) || id > 0xffff) { 1971 idr_remove(&local->ack_status_frames, id); 1972 r = -ERANGE; 1973 } 1974 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1975 1976 if (!r) { 1977 info_id = id; 1978 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 1979 } else if (skb_shared(skb)) { 1980 kfree_skb(orig_skb); 1981 } else { 1982 kfree_skb(skb); 1983 skb = orig_skb; 1984 } 1985 } else { 1986 /* couldn't clone -- lose tx status ... */ 1987 skb = orig_skb; 1988 } 1989 } 1990 1991 /* 1992 * If the skb is shared we need to obtain our own copy. 1993 */ 1994 if (skb_shared(skb)) { 1995 struct sk_buff *tmp_skb = skb; 1996 1997 /* can't happen -- skb is a clone if info_id != 0 */ 1998 WARN_ON(info_id); 1999 2000 skb = skb_clone(skb, GFP_ATOMIC); 2001 kfree_skb(tmp_skb); 2002 2003 if (!skb) { 2004 ret = NETDEV_TX_OK; 2005 goto fail; 2006 } 2007 } 2008 2009 hdr.frame_control = fc; 2010 hdr.duration_id = 0; 2011 hdr.seq_ctrl = 0; 2012 2013 skip_header_bytes = ETH_HLEN; 2014 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2015 encaps_data = bridge_tunnel_header; 2016 encaps_len = sizeof(bridge_tunnel_header); 2017 skip_header_bytes -= 2; 2018 } else if (ethertype >= 0x600) { 2019 encaps_data = rfc1042_header; 2020 encaps_len = sizeof(rfc1042_header); 2021 skip_header_bytes -= 2; 2022 } else { 2023 encaps_data = NULL; 2024 encaps_len = 0; 2025 } 2026 2027 nh_pos = skb_network_header(skb) - skb->data; 2028 h_pos = skb_transport_header(skb) - skb->data; 2029 2030 skb_pull(skb, skip_header_bytes); 2031 nh_pos -= skip_header_bytes; 2032 h_pos -= skip_header_bytes; 2033 2034 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2035 2036 /* 2037 * So we need to modify the skb header and hence need a copy of 2038 * that. The head_need variable above doesn't, so far, include 2039 * the needed header space that we don't need right away. If we 2040 * can, then we don't reallocate right now but only after the 2041 * frame arrives at the master device (if it does...) 2042 * 2043 * If we cannot, however, then we will reallocate to include all 2044 * the ever needed space. Also, if we need to reallocate it anyway, 2045 * make it big enough for everything we may ever need. 2046 */ 2047 2048 if (head_need > 0 || skb_cloned(skb)) { 2049 head_need += IEEE80211_ENCRYPT_HEADROOM; 2050 head_need += local->tx_headroom; 2051 head_need = max_t(int, 0, head_need); 2052 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 2053 goto fail; 2054 } 2055 2056 if (encaps_data) { 2057 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2058 nh_pos += encaps_len; 2059 h_pos += encaps_len; 2060 } 2061 2062 #ifdef CONFIG_MAC80211_MESH 2063 if (meshhdrlen > 0) { 2064 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2065 nh_pos += meshhdrlen; 2066 h_pos += meshhdrlen; 2067 } 2068 #endif 2069 2070 if (ieee80211_is_data_qos(fc)) { 2071 __le16 *qos_control; 2072 2073 qos_control = (__le16*) skb_push(skb, 2); 2074 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2075 /* 2076 * Maybe we could actually set some fields here, for now just 2077 * initialise to zero to indicate no special operation. 2078 */ 2079 *qos_control = 0; 2080 } else 2081 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2082 2083 nh_pos += hdrlen; 2084 h_pos += hdrlen; 2085 2086 dev->stats.tx_packets++; 2087 dev->stats.tx_bytes += skb->len; 2088 2089 /* Update skb pointers to various headers since this modified frame 2090 * is going to go through Linux networking code that may potentially 2091 * need things like pointer to IP header. */ 2092 skb_set_mac_header(skb, 0); 2093 skb_set_network_header(skb, nh_pos); 2094 skb_set_transport_header(skb, h_pos); 2095 2096 info = IEEE80211_SKB_CB(skb); 2097 memset(info, 0, sizeof(*info)); 2098 2099 dev->trans_start = jiffies; 2100 2101 info->flags = info_flags; 2102 info->ack_frame_id = info_id; 2103 2104 ieee80211_xmit(sdata, skb); 2105 2106 return NETDEV_TX_OK; 2107 2108 fail: 2109 if (ret == NETDEV_TX_OK) 2110 dev_kfree_skb(skb); 2111 2112 return ret; 2113 } 2114 2115 2116 /* 2117 * ieee80211_clear_tx_pending may not be called in a context where 2118 * it is possible that it packets could come in again. 2119 */ 2120 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2121 { 2122 int i; 2123 2124 for (i = 0; i < local->hw.queues; i++) 2125 skb_queue_purge(&local->pending[i]); 2126 } 2127 2128 /* 2129 * Returns false if the frame couldn't be transmitted but was queued instead, 2130 * which in this case means re-queued -- take as an indication to stop sending 2131 * more pending frames. 2132 */ 2133 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2134 struct sk_buff *skb) 2135 { 2136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2137 struct ieee80211_sub_if_data *sdata; 2138 struct sta_info *sta; 2139 struct ieee80211_hdr *hdr; 2140 bool result; 2141 2142 sdata = vif_to_sdata(info->control.vif); 2143 2144 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2145 result = ieee80211_tx(sdata, skb, true); 2146 } else { 2147 struct sk_buff_head skbs; 2148 2149 __skb_queue_head_init(&skbs); 2150 __skb_queue_tail(&skbs, skb); 2151 2152 hdr = (struct ieee80211_hdr *)skb->data; 2153 sta = sta_info_get(sdata, hdr->addr1); 2154 2155 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2156 } 2157 2158 return result; 2159 } 2160 2161 /* 2162 * Transmit all pending packets. Called from tasklet. 2163 */ 2164 void ieee80211_tx_pending(unsigned long data) 2165 { 2166 struct ieee80211_local *local = (struct ieee80211_local *)data; 2167 struct ieee80211_sub_if_data *sdata; 2168 unsigned long flags; 2169 int i; 2170 bool txok; 2171 2172 rcu_read_lock(); 2173 2174 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2175 for (i = 0; i < local->hw.queues; i++) { 2176 /* 2177 * If queue is stopped by something other than due to pending 2178 * frames, or we have no pending frames, proceed to next queue. 2179 */ 2180 if (local->queue_stop_reasons[i] || 2181 skb_queue_empty(&local->pending[i])) 2182 continue; 2183 2184 while (!skb_queue_empty(&local->pending[i])) { 2185 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2187 2188 if (WARN_ON(!info->control.vif)) { 2189 kfree_skb(skb); 2190 continue; 2191 } 2192 2193 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2194 flags); 2195 2196 txok = ieee80211_tx_pending_skb(local, skb); 2197 spin_lock_irqsave(&local->queue_stop_reason_lock, 2198 flags); 2199 if (!txok) 2200 break; 2201 } 2202 2203 if (skb_queue_empty(&local->pending[i])) 2204 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2205 netif_wake_subqueue(sdata->dev, i); 2206 } 2207 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2208 2209 rcu_read_unlock(); 2210 } 2211 2212 /* functions for drivers to get certain frames */ 2213 2214 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, 2215 struct sk_buff *skb, 2216 struct beacon_data *beacon) 2217 { 2218 u8 *pos, *tim; 2219 int aid0 = 0; 2220 int i, have_bits = 0, n1, n2; 2221 2222 /* Generate bitmap for TIM only if there are any STAs in power save 2223 * mode. */ 2224 if (atomic_read(&bss->num_sta_ps) > 0) 2225 /* in the hope that this is faster than 2226 * checking byte-for-byte */ 2227 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2228 IEEE80211_MAX_AID+1); 2229 2230 if (bss->dtim_count == 0) 2231 bss->dtim_count = beacon->dtim_period - 1; 2232 else 2233 bss->dtim_count--; 2234 2235 tim = pos = (u8 *) skb_put(skb, 6); 2236 *pos++ = WLAN_EID_TIM; 2237 *pos++ = 4; 2238 *pos++ = bss->dtim_count; 2239 *pos++ = beacon->dtim_period; 2240 2241 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2242 aid0 = 1; 2243 2244 bss->dtim_bc_mc = aid0 == 1; 2245 2246 if (have_bits) { 2247 /* Find largest even number N1 so that bits numbered 1 through 2248 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2249 * (N2 + 1) x 8 through 2007 are 0. */ 2250 n1 = 0; 2251 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2252 if (bss->tim[i]) { 2253 n1 = i & 0xfe; 2254 break; 2255 } 2256 } 2257 n2 = n1; 2258 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2259 if (bss->tim[i]) { 2260 n2 = i; 2261 break; 2262 } 2263 } 2264 2265 /* Bitmap control */ 2266 *pos++ = n1 | aid0; 2267 /* Part Virt Bitmap */ 2268 skb_put(skb, n2 - n1); 2269 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2270 2271 tim[1] = n2 - n1 + 4; 2272 } else { 2273 *pos++ = aid0; /* Bitmap control */ 2274 *pos++ = 0; /* Part Virt Bitmap */ 2275 } 2276 } 2277 2278 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2279 struct ieee80211_vif *vif, 2280 u16 *tim_offset, u16 *tim_length) 2281 { 2282 struct ieee80211_local *local = hw_to_local(hw); 2283 struct sk_buff *skb = NULL; 2284 struct ieee80211_tx_info *info; 2285 struct ieee80211_sub_if_data *sdata = NULL; 2286 struct ieee80211_if_ap *ap = NULL; 2287 struct beacon_data *beacon; 2288 struct ieee80211_supported_band *sband; 2289 enum ieee80211_band band = local->hw.conf.channel->band; 2290 struct ieee80211_tx_rate_control txrc; 2291 2292 sband = local->hw.wiphy->bands[band]; 2293 2294 rcu_read_lock(); 2295 2296 sdata = vif_to_sdata(vif); 2297 2298 if (!ieee80211_sdata_running(sdata)) 2299 goto out; 2300 2301 if (tim_offset) 2302 *tim_offset = 0; 2303 if (tim_length) 2304 *tim_length = 0; 2305 2306 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2307 ap = &sdata->u.ap; 2308 beacon = rcu_dereference(ap->beacon); 2309 if (beacon) { 2310 /* 2311 * headroom, head length, 2312 * tail length and maximum TIM length 2313 */ 2314 skb = dev_alloc_skb(local->tx_headroom + 2315 beacon->head_len + 2316 beacon->tail_len + 256); 2317 if (!skb) 2318 goto out; 2319 2320 skb_reserve(skb, local->tx_headroom); 2321 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2322 beacon->head_len); 2323 2324 /* 2325 * Not very nice, but we want to allow the driver to call 2326 * ieee80211_beacon_get() as a response to the set_tim() 2327 * callback. That, however, is already invoked under the 2328 * sta_lock to guarantee consistent and race-free update 2329 * of the tim bitmap in mac80211 and the driver. 2330 */ 2331 if (local->tim_in_locked_section) { 2332 ieee80211_beacon_add_tim(ap, skb, beacon); 2333 } else { 2334 unsigned long flags; 2335 2336 spin_lock_irqsave(&local->tim_lock, flags); 2337 ieee80211_beacon_add_tim(ap, skb, beacon); 2338 spin_unlock_irqrestore(&local->tim_lock, flags); 2339 } 2340 2341 if (tim_offset) 2342 *tim_offset = beacon->head_len; 2343 if (tim_length) 2344 *tim_length = skb->len - beacon->head_len; 2345 2346 if (beacon->tail) 2347 memcpy(skb_put(skb, beacon->tail_len), 2348 beacon->tail, beacon->tail_len); 2349 } else 2350 goto out; 2351 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2352 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2353 struct ieee80211_hdr *hdr; 2354 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2355 2356 if (!presp) 2357 goto out; 2358 2359 skb = skb_copy(presp, GFP_ATOMIC); 2360 if (!skb) 2361 goto out; 2362 2363 hdr = (struct ieee80211_hdr *) skb->data; 2364 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2365 IEEE80211_STYPE_BEACON); 2366 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2367 struct ieee80211_mgmt *mgmt; 2368 u8 *pos; 2369 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2370 sizeof(mgmt->u.beacon); 2371 2372 #ifdef CONFIG_MAC80211_MESH 2373 if (!sdata->u.mesh.mesh_id_len) 2374 goto out; 2375 #endif 2376 2377 skb = dev_alloc_skb(local->tx_headroom + 2378 hdr_len + 2379 2 + /* NULL SSID */ 2380 2 + 8 + /* supported rates */ 2381 2 + 3 + /* DS params */ 2382 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2383 2 + sizeof(struct ieee80211_ht_cap) + 2384 2 + sizeof(struct ieee80211_ht_info) + 2385 2 + sdata->u.mesh.mesh_id_len + 2386 2 + sizeof(struct ieee80211_meshconf_ie) + 2387 sdata->u.mesh.ie_len); 2388 if (!skb) 2389 goto out; 2390 2391 skb_reserve(skb, local->hw.extra_tx_headroom); 2392 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2393 memset(mgmt, 0, hdr_len); 2394 mgmt->frame_control = 2395 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2396 memset(mgmt->da, 0xff, ETH_ALEN); 2397 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2398 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2399 mgmt->u.beacon.beacon_int = 2400 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2401 mgmt->u.beacon.capab_info |= cpu_to_le16( 2402 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2403 2404 pos = skb_put(skb, 2); 2405 *pos++ = WLAN_EID_SSID; 2406 *pos++ = 0x0; 2407 2408 if (ieee80211_add_srates_ie(&sdata->vif, skb) || 2409 mesh_add_ds_params_ie(skb, sdata) || 2410 ieee80211_add_ext_srates_ie(&sdata->vif, skb) || 2411 mesh_add_rsn_ie(skb, sdata) || 2412 mesh_add_ht_cap_ie(skb, sdata) || 2413 mesh_add_ht_info_ie(skb, sdata) || 2414 mesh_add_meshid_ie(skb, sdata) || 2415 mesh_add_meshconf_ie(skb, sdata) || 2416 mesh_add_vendor_ies(skb, sdata)) { 2417 pr_err("o11s: couldn't add ies!\n"); 2418 goto out; 2419 } 2420 } else { 2421 WARN_ON(1); 2422 goto out; 2423 } 2424 2425 info = IEEE80211_SKB_CB(skb); 2426 2427 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2428 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2429 info->band = band; 2430 2431 memset(&txrc, 0, sizeof(txrc)); 2432 txrc.hw = hw; 2433 txrc.sband = sband; 2434 txrc.bss_conf = &sdata->vif.bss_conf; 2435 txrc.skb = skb; 2436 txrc.reported_rate.idx = -1; 2437 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2438 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2439 txrc.max_rate_idx = -1; 2440 else 2441 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2442 txrc.bss = true; 2443 rate_control_get_rate(sdata, NULL, &txrc); 2444 2445 info->control.vif = vif; 2446 2447 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2448 IEEE80211_TX_CTL_ASSIGN_SEQ | 2449 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2450 out: 2451 rcu_read_unlock(); 2452 return skb; 2453 } 2454 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2455 2456 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2457 struct ieee80211_vif *vif) 2458 { 2459 struct ieee80211_if_ap *ap = NULL; 2460 struct sk_buff *presp = NULL, *skb = NULL; 2461 struct ieee80211_hdr *hdr; 2462 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2463 2464 if (sdata->vif.type != NL80211_IFTYPE_AP) 2465 return NULL; 2466 2467 rcu_read_lock(); 2468 2469 ap = &sdata->u.ap; 2470 presp = rcu_dereference(ap->probe_resp); 2471 if (!presp) 2472 goto out; 2473 2474 skb = skb_copy(presp, GFP_ATOMIC); 2475 if (!skb) 2476 goto out; 2477 2478 hdr = (struct ieee80211_hdr *) skb->data; 2479 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2480 2481 out: 2482 rcu_read_unlock(); 2483 return skb; 2484 } 2485 EXPORT_SYMBOL(ieee80211_proberesp_get); 2486 2487 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2488 struct ieee80211_vif *vif) 2489 { 2490 struct ieee80211_sub_if_data *sdata; 2491 struct ieee80211_if_managed *ifmgd; 2492 struct ieee80211_pspoll *pspoll; 2493 struct ieee80211_local *local; 2494 struct sk_buff *skb; 2495 2496 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2497 return NULL; 2498 2499 sdata = vif_to_sdata(vif); 2500 ifmgd = &sdata->u.mgd; 2501 local = sdata->local; 2502 2503 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2504 if (!skb) 2505 return NULL; 2506 2507 skb_reserve(skb, local->hw.extra_tx_headroom); 2508 2509 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2510 memset(pspoll, 0, sizeof(*pspoll)); 2511 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2512 IEEE80211_STYPE_PSPOLL); 2513 pspoll->aid = cpu_to_le16(ifmgd->aid); 2514 2515 /* aid in PS-Poll has its two MSBs each set to 1 */ 2516 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2517 2518 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2519 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2520 2521 return skb; 2522 } 2523 EXPORT_SYMBOL(ieee80211_pspoll_get); 2524 2525 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2526 struct ieee80211_vif *vif) 2527 { 2528 struct ieee80211_hdr_3addr *nullfunc; 2529 struct ieee80211_sub_if_data *sdata; 2530 struct ieee80211_if_managed *ifmgd; 2531 struct ieee80211_local *local; 2532 struct sk_buff *skb; 2533 2534 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2535 return NULL; 2536 2537 sdata = vif_to_sdata(vif); 2538 ifmgd = &sdata->u.mgd; 2539 local = sdata->local; 2540 2541 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2542 if (!skb) 2543 return NULL; 2544 2545 skb_reserve(skb, local->hw.extra_tx_headroom); 2546 2547 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2548 sizeof(*nullfunc)); 2549 memset(nullfunc, 0, sizeof(*nullfunc)); 2550 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2551 IEEE80211_STYPE_NULLFUNC | 2552 IEEE80211_FCTL_TODS); 2553 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2554 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2555 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2556 2557 return skb; 2558 } 2559 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2560 2561 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2562 struct ieee80211_vif *vif, 2563 const u8 *ssid, size_t ssid_len, 2564 const u8 *ie, size_t ie_len) 2565 { 2566 struct ieee80211_sub_if_data *sdata; 2567 struct ieee80211_local *local; 2568 struct ieee80211_hdr_3addr *hdr; 2569 struct sk_buff *skb; 2570 size_t ie_ssid_len; 2571 u8 *pos; 2572 2573 sdata = vif_to_sdata(vif); 2574 local = sdata->local; 2575 ie_ssid_len = 2 + ssid_len; 2576 2577 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2578 ie_ssid_len + ie_len); 2579 if (!skb) 2580 return NULL; 2581 2582 skb_reserve(skb, local->hw.extra_tx_headroom); 2583 2584 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2585 memset(hdr, 0, sizeof(*hdr)); 2586 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2587 IEEE80211_STYPE_PROBE_REQ); 2588 memset(hdr->addr1, 0xff, ETH_ALEN); 2589 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2590 memset(hdr->addr3, 0xff, ETH_ALEN); 2591 2592 pos = skb_put(skb, ie_ssid_len); 2593 *pos++ = WLAN_EID_SSID; 2594 *pos++ = ssid_len; 2595 if (ssid) 2596 memcpy(pos, ssid, ssid_len); 2597 pos += ssid_len; 2598 2599 if (ie) { 2600 pos = skb_put(skb, ie_len); 2601 memcpy(pos, ie, ie_len); 2602 } 2603 2604 return skb; 2605 } 2606 EXPORT_SYMBOL(ieee80211_probereq_get); 2607 2608 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2609 const void *frame, size_t frame_len, 2610 const struct ieee80211_tx_info *frame_txctl, 2611 struct ieee80211_rts *rts) 2612 { 2613 const struct ieee80211_hdr *hdr = frame; 2614 2615 rts->frame_control = 2616 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2617 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2618 frame_txctl); 2619 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2620 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2621 } 2622 EXPORT_SYMBOL(ieee80211_rts_get); 2623 2624 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2625 const void *frame, size_t frame_len, 2626 const struct ieee80211_tx_info *frame_txctl, 2627 struct ieee80211_cts *cts) 2628 { 2629 const struct ieee80211_hdr *hdr = frame; 2630 2631 cts->frame_control = 2632 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2633 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2634 frame_len, frame_txctl); 2635 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2636 } 2637 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2638 2639 struct sk_buff * 2640 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2641 struct ieee80211_vif *vif) 2642 { 2643 struct ieee80211_local *local = hw_to_local(hw); 2644 struct sk_buff *skb = NULL; 2645 struct ieee80211_tx_data tx; 2646 struct ieee80211_sub_if_data *sdata; 2647 struct ieee80211_if_ap *bss = NULL; 2648 struct beacon_data *beacon; 2649 struct ieee80211_tx_info *info; 2650 2651 sdata = vif_to_sdata(vif); 2652 bss = &sdata->u.ap; 2653 2654 rcu_read_lock(); 2655 beacon = rcu_dereference(bss->beacon); 2656 2657 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2658 goto out; 2659 2660 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2661 goto out; /* send buffered bc/mc only after DTIM beacon */ 2662 2663 while (1) { 2664 skb = skb_dequeue(&bss->ps_bc_buf); 2665 if (!skb) 2666 goto out; 2667 local->total_ps_buffered--; 2668 2669 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2670 struct ieee80211_hdr *hdr = 2671 (struct ieee80211_hdr *) skb->data; 2672 /* more buffered multicast/broadcast frames ==> set 2673 * MoreData flag in IEEE 802.11 header to inform PS 2674 * STAs */ 2675 hdr->frame_control |= 2676 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2677 } 2678 2679 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2680 break; 2681 dev_kfree_skb_any(skb); 2682 } 2683 2684 info = IEEE80211_SKB_CB(skb); 2685 2686 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2687 tx.channel = local->hw.conf.channel; 2688 info->band = tx.channel->band; 2689 2690 if (invoke_tx_handlers(&tx)) 2691 skb = NULL; 2692 out: 2693 rcu_read_unlock(); 2694 2695 return skb; 2696 } 2697 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2698 2699 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2700 struct sk_buff *skb, int tid) 2701 { 2702 skb_set_mac_header(skb, 0); 2703 skb_set_network_header(skb, 0); 2704 skb_set_transport_header(skb, 0); 2705 2706 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); 2707 skb->priority = tid; 2708 2709 /* 2710 * The other path calling ieee80211_xmit is from the tasklet, 2711 * and while we can handle concurrent transmissions locking 2712 * requirements are that we do not come into tx with bhs on. 2713 */ 2714 local_bh_disable(); 2715 ieee80211_xmit(sdata, skb); 2716 local_bh_enable(); 2717 } 2718