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(sband->band, 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(sband->band, next_frag_len, 171 txrate->bitrate, erp, 172 tx->sdata->vif.bss_conf.use_short_preamble); 173 } 174 175 return cpu_to_le16(dur); 176 } 177 178 static inline int is_ieee80211_device(struct ieee80211_local *local, 179 struct net_device *dev) 180 { 181 return local == wdev_priv(dev->ieee80211_ptr); 182 } 183 184 /* tx handlers */ 185 static ieee80211_tx_result debug_noinline 186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 187 { 188 struct ieee80211_local *local = tx->local; 189 struct ieee80211_if_managed *ifmgd; 190 191 /* driver doesn't support power save */ 192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 193 return TX_CONTINUE; 194 195 /* hardware does dynamic power save */ 196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 197 return TX_CONTINUE; 198 199 /* dynamic power save disabled */ 200 if (local->hw.conf.dynamic_ps_timeout <= 0) 201 return TX_CONTINUE; 202 203 /* we are scanning, don't enable power save */ 204 if (local->scanning) 205 return TX_CONTINUE; 206 207 if (!local->ps_sdata) 208 return TX_CONTINUE; 209 210 /* No point if we're going to suspend */ 211 if (local->quiescing) 212 return TX_CONTINUE; 213 214 /* dynamic ps is supported only in managed mode */ 215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 216 return TX_CONTINUE; 217 218 ifmgd = &tx->sdata->u.mgd; 219 220 /* 221 * Don't wakeup from power save if u-apsd is enabled, voip ac has 222 * u-apsd enabled and the frame is in voip class. This effectively 223 * means that even if all access categories have u-apsd enabled, in 224 * practise u-apsd is only used with the voip ac. This is a 225 * workaround for the case when received voip class packets do not 226 * have correct qos tag for some reason, due the network or the 227 * peer application. 228 * 229 * Note: ifmgd->uapsd_queues access is racy here. If the value is 230 * changed via debugfs, user needs to reassociate manually to have 231 * everything in sync. 232 */ 233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 234 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 235 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 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_mcast_sta))) { 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 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 404 info->hw_queue = tx->sdata->vif.cab_queue; 405 406 /* device releases frame after DTIM beacon */ 407 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 408 return TX_CONTINUE; 409 410 /* buffered in mac80211 */ 411 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 412 purge_old_ps_buffers(tx->local); 413 414 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) { 415 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 416 net_dbg_ratelimited("%s: BC TX buffer full - dropping the oldest frame\n", 417 tx->sdata->name); 418 #endif 419 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 420 } else 421 tx->local->total_ps_buffered++; 422 423 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 424 425 return TX_QUEUED; 426 } 427 428 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 429 struct sk_buff *skb) 430 { 431 if (!ieee80211_is_mgmt(fc)) 432 return 0; 433 434 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 435 return 0; 436 437 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 438 skb->data)) 439 return 0; 440 441 return 1; 442 } 443 444 static ieee80211_tx_result 445 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 446 { 447 struct sta_info *sta = tx->sta; 448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 450 struct ieee80211_local *local = tx->local; 451 452 if (unlikely(!sta)) 453 return TX_CONTINUE; 454 455 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 456 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 457 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 458 int ac = skb_get_queue_mapping(tx->skb); 459 460 /* only deauth, disassoc and action are bufferable MMPDUs */ 461 if (ieee80211_is_mgmt(hdr->frame_control) && 462 !ieee80211_is_deauth(hdr->frame_control) && 463 !ieee80211_is_disassoc(hdr->frame_control) && 464 !ieee80211_is_action(hdr->frame_control)) { 465 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 466 return TX_CONTINUE; 467 } 468 469 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 470 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n", 471 sta->sta.addr, sta->sta.aid, ac); 472 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 473 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 474 purge_old_ps_buffers(tx->local); 475 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 476 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 477 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 478 net_dbg_ratelimited("%s: STA %pM TX buffer for AC %d full - dropping oldest frame\n", 479 tx->sdata->name, sta->sta.addr, ac); 480 #endif 481 dev_kfree_skb(old); 482 } else 483 tx->local->total_ps_buffered++; 484 485 info->control.jiffies = jiffies; 486 info->control.vif = &tx->sdata->vif; 487 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 488 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 489 490 if (!timer_pending(&local->sta_cleanup)) 491 mod_timer(&local->sta_cleanup, 492 round_jiffies(jiffies + 493 STA_INFO_CLEANUP_INTERVAL)); 494 495 /* 496 * We queued up some frames, so the TIM bit might 497 * need to be set, recalculate it. 498 */ 499 sta_info_recalc_tim(sta); 500 501 return TX_QUEUED; 502 } 503 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 504 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 505 printk(KERN_DEBUG 506 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n", 507 tx->sdata->name, sta->sta.addr); 508 } 509 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 510 511 return TX_CONTINUE; 512 } 513 514 static ieee80211_tx_result debug_noinline 515 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 516 { 517 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 518 return TX_CONTINUE; 519 520 if (tx->flags & IEEE80211_TX_UNICAST) 521 return ieee80211_tx_h_unicast_ps_buf(tx); 522 else 523 return ieee80211_tx_h_multicast_ps_buf(tx); 524 } 525 526 static ieee80211_tx_result debug_noinline 527 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 528 { 529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 530 531 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 532 tx->sdata->control_port_no_encrypt)) 533 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 534 535 return TX_CONTINUE; 536 } 537 538 static ieee80211_tx_result debug_noinline 539 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 540 { 541 struct ieee80211_key *key = NULL; 542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 544 545 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 546 tx->key = NULL; 547 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 548 tx->key = key; 549 else if (ieee80211_is_mgmt(hdr->frame_control) && 550 is_multicast_ether_addr(hdr->addr1) && 551 ieee80211_is_robust_mgmt_frame(hdr) && 552 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 553 tx->key = key; 554 else if (is_multicast_ether_addr(hdr->addr1) && 555 (key = rcu_dereference(tx->sdata->default_multicast_key))) 556 tx->key = key; 557 else if (!is_multicast_ether_addr(hdr->addr1) && 558 (key = rcu_dereference(tx->sdata->default_unicast_key))) 559 tx->key = key; 560 else if (tx->sdata->drop_unencrypted && 561 (tx->skb->protocol != tx->sdata->control_port_protocol) && 562 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 563 (!ieee80211_is_robust_mgmt_frame(hdr) || 564 (ieee80211_is_action(hdr->frame_control) && 565 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) { 566 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 567 return TX_DROP; 568 } else 569 tx->key = NULL; 570 571 if (tx->key) { 572 bool skip_hw = false; 573 574 tx->key->tx_rx_count++; 575 /* TODO: add threshold stuff again */ 576 577 switch (tx->key->conf.cipher) { 578 case WLAN_CIPHER_SUITE_WEP40: 579 case WLAN_CIPHER_SUITE_WEP104: 580 case WLAN_CIPHER_SUITE_TKIP: 581 if (!ieee80211_is_data_present(hdr->frame_control)) 582 tx->key = NULL; 583 break; 584 case WLAN_CIPHER_SUITE_CCMP: 585 if (!ieee80211_is_data_present(hdr->frame_control) && 586 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 587 tx->skb)) 588 tx->key = NULL; 589 else 590 skip_hw = (tx->key->conf.flags & 591 IEEE80211_KEY_FLAG_SW_MGMT) && 592 ieee80211_is_mgmt(hdr->frame_control); 593 break; 594 case WLAN_CIPHER_SUITE_AES_CMAC: 595 if (!ieee80211_is_mgmt(hdr->frame_control)) 596 tx->key = NULL; 597 break; 598 } 599 600 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 601 return TX_DROP; 602 603 if (!skip_hw && tx->key && 604 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 605 info->control.hw_key = &tx->key->conf; 606 } 607 608 return TX_CONTINUE; 609 } 610 611 static ieee80211_tx_result debug_noinline 612 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 613 { 614 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 615 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 616 struct ieee80211_supported_band *sband; 617 struct ieee80211_rate *rate; 618 int i; 619 u32 len; 620 bool inval = false, rts = false, short_preamble = false; 621 struct ieee80211_tx_rate_control txrc; 622 bool assoc = false; 623 624 memset(&txrc, 0, sizeof(txrc)); 625 626 sband = tx->local->hw.wiphy->bands[tx->channel->band]; 627 628 len = min_t(u32, tx->skb->len + FCS_LEN, 629 tx->local->hw.wiphy->frag_threshold); 630 631 /* set up the tx rate control struct we give the RC algo */ 632 txrc.hw = &tx->local->hw; 633 txrc.sband = sband; 634 txrc.bss_conf = &tx->sdata->vif.bss_conf; 635 txrc.skb = tx->skb; 636 txrc.reported_rate.idx = -1; 637 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band]; 638 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 639 txrc.max_rate_idx = -1; 640 else 641 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 642 memcpy(txrc.rate_idx_mcs_mask, 643 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band], 644 sizeof(txrc.rate_idx_mcs_mask)); 645 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 646 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 647 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 648 649 /* set up RTS protection if desired */ 650 if (len > tx->local->hw.wiphy->rts_threshold) { 651 txrc.rts = rts = true; 652 } 653 654 /* 655 * Use short preamble if the BSS can handle it, but not for 656 * management frames unless we know the receiver can handle 657 * that -- the management frame might be to a station that 658 * just wants a probe response. 659 */ 660 if (tx->sdata->vif.bss_conf.use_short_preamble && 661 (ieee80211_is_data(hdr->frame_control) || 662 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 663 txrc.short_preamble = short_preamble = true; 664 665 if (tx->sta) 666 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 667 668 /* 669 * Lets not bother rate control if we're associated and cannot 670 * talk to the sta. This should not happen. 671 */ 672 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 673 !rate_usable_index_exists(sband, &tx->sta->sta), 674 "%s: Dropped data frame as no usable bitrate found while " 675 "scanning and associated. Target station: " 676 "%pM on %d GHz band\n", 677 tx->sdata->name, hdr->addr1, 678 tx->channel->band ? 5 : 2)) 679 return TX_DROP; 680 681 /* 682 * If we're associated with the sta at this point we know we can at 683 * least send the frame at the lowest bit rate. 684 */ 685 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 686 687 if (unlikely(info->control.rates[0].idx < 0)) 688 return TX_DROP; 689 690 if (txrc.reported_rate.idx < 0) { 691 txrc.reported_rate = info->control.rates[0]; 692 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 693 tx->sta->last_tx_rate = txrc.reported_rate; 694 } else if (tx->sta) 695 tx->sta->last_tx_rate = txrc.reported_rate; 696 697 if (unlikely(!info->control.rates[0].count)) 698 info->control.rates[0].count = 1; 699 700 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 701 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 702 info->control.rates[0].count = 1; 703 704 if (is_multicast_ether_addr(hdr->addr1)) { 705 /* 706 * XXX: verify the rate is in the basic rateset 707 */ 708 return TX_CONTINUE; 709 } 710 711 /* 712 * set up the RTS/CTS rate as the fastest basic rate 713 * that is not faster than the data rate 714 * 715 * XXX: Should this check all retry rates? 716 */ 717 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 718 s8 baserate = 0; 719 720 rate = &sband->bitrates[info->control.rates[0].idx]; 721 722 for (i = 0; i < sband->n_bitrates; i++) { 723 /* must be a basic rate */ 724 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 725 continue; 726 /* must not be faster than the data rate */ 727 if (sband->bitrates[i].bitrate > rate->bitrate) 728 continue; 729 /* maximum */ 730 if (sband->bitrates[baserate].bitrate < 731 sband->bitrates[i].bitrate) 732 baserate = i; 733 } 734 735 info->control.rts_cts_rate_idx = baserate; 736 } 737 738 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 739 /* 740 * make sure there's no valid rate following 741 * an invalid one, just in case drivers don't 742 * take the API seriously to stop at -1. 743 */ 744 if (inval) { 745 info->control.rates[i].idx = -1; 746 continue; 747 } 748 if (info->control.rates[i].idx < 0) { 749 inval = true; 750 continue; 751 } 752 753 /* 754 * For now assume MCS is already set up correctly, this 755 * needs to be fixed. 756 */ 757 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 758 WARN_ON(info->control.rates[i].idx > 76); 759 continue; 760 } 761 762 /* set up RTS protection if desired */ 763 if (rts) 764 info->control.rates[i].flags |= 765 IEEE80211_TX_RC_USE_RTS_CTS; 766 767 /* RC is busted */ 768 if (WARN_ON_ONCE(info->control.rates[i].idx >= 769 sband->n_bitrates)) { 770 info->control.rates[i].idx = -1; 771 continue; 772 } 773 774 rate = &sband->bitrates[info->control.rates[i].idx]; 775 776 /* set up short preamble */ 777 if (short_preamble && 778 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 779 info->control.rates[i].flags |= 780 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 781 782 /* set up G protection */ 783 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 784 rate->flags & IEEE80211_RATE_ERP_G) 785 info->control.rates[i].flags |= 786 IEEE80211_TX_RC_USE_CTS_PROTECT; 787 } 788 789 return TX_CONTINUE; 790 } 791 792 static ieee80211_tx_result debug_noinline 793 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 794 { 795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 797 u16 *seq; 798 u8 *qc; 799 int tid; 800 801 /* 802 * Packet injection may want to control the sequence 803 * number, if we have no matching interface then we 804 * neither assign one ourselves nor ask the driver to. 805 */ 806 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 807 return TX_CONTINUE; 808 809 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 810 return TX_CONTINUE; 811 812 if (ieee80211_hdrlen(hdr->frame_control) < 24) 813 return TX_CONTINUE; 814 815 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 816 return TX_CONTINUE; 817 818 /* 819 * Anything but QoS data that has a sequence number field 820 * (is long enough) gets a sequence number from the global 821 * counter. 822 */ 823 if (!ieee80211_is_data_qos(hdr->frame_control)) { 824 /* driver should assign sequence number */ 825 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 826 /* for pure STA mode without beacons, we can do it */ 827 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 828 tx->sdata->sequence_number += 0x10; 829 return TX_CONTINUE; 830 } 831 832 /* 833 * This should be true for injected/management frames only, for 834 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 835 * above since they are not QoS-data frames. 836 */ 837 if (!tx->sta) 838 return TX_CONTINUE; 839 840 /* include per-STA, per-TID sequence counter */ 841 842 qc = ieee80211_get_qos_ctl(hdr); 843 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 844 seq = &tx->sta->tid_seq[tid]; 845 846 hdr->seq_ctrl = cpu_to_le16(*seq); 847 848 /* Increase the sequence number. */ 849 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 850 851 return TX_CONTINUE; 852 } 853 854 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 855 struct sk_buff *skb, int hdrlen, 856 int frag_threshold) 857 { 858 struct ieee80211_local *local = tx->local; 859 struct ieee80211_tx_info *info; 860 struct sk_buff *tmp; 861 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 862 int pos = hdrlen + per_fragm; 863 int rem = skb->len - hdrlen - per_fragm; 864 865 if (WARN_ON(rem < 0)) 866 return -EINVAL; 867 868 /* first fragment was already added to queue by caller */ 869 870 while (rem) { 871 int fraglen = per_fragm; 872 873 if (fraglen > rem) 874 fraglen = rem; 875 rem -= fraglen; 876 tmp = dev_alloc_skb(local->tx_headroom + 877 frag_threshold + 878 IEEE80211_ENCRYPT_HEADROOM + 879 IEEE80211_ENCRYPT_TAILROOM); 880 if (!tmp) 881 return -ENOMEM; 882 883 __skb_queue_tail(&tx->skbs, tmp); 884 885 skb_reserve(tmp, local->tx_headroom + 886 IEEE80211_ENCRYPT_HEADROOM); 887 /* copy control information */ 888 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 889 890 info = IEEE80211_SKB_CB(tmp); 891 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 892 IEEE80211_TX_CTL_FIRST_FRAGMENT); 893 894 if (rem) 895 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 896 897 skb_copy_queue_mapping(tmp, skb); 898 tmp->priority = skb->priority; 899 tmp->dev = skb->dev; 900 901 /* copy header and data */ 902 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 903 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 904 905 pos += fraglen; 906 } 907 908 /* adjust first fragment's length */ 909 skb->len = hdrlen + per_fragm; 910 return 0; 911 } 912 913 static ieee80211_tx_result debug_noinline 914 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 915 { 916 struct sk_buff *skb = tx->skb; 917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 918 struct ieee80211_hdr *hdr = (void *)skb->data; 919 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 920 int hdrlen; 921 int fragnum; 922 923 /* no matter what happens, tx->skb moves to tx->skbs */ 924 __skb_queue_tail(&tx->skbs, skb); 925 tx->skb = NULL; 926 927 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 928 return TX_CONTINUE; 929 930 if (tx->local->ops->set_frag_threshold) 931 return TX_CONTINUE; 932 933 /* 934 * Warn when submitting a fragmented A-MPDU frame and drop it. 935 * This scenario is handled in ieee80211_tx_prepare but extra 936 * caution taken here as fragmented ampdu may cause Tx stop. 937 */ 938 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 939 return TX_DROP; 940 941 hdrlen = ieee80211_hdrlen(hdr->frame_control); 942 943 /* internal error, why isn't DONTFRAG set? */ 944 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 945 return TX_DROP; 946 947 /* 948 * Now fragment the frame. This will allocate all the fragments and 949 * chain them (using skb as the first fragment) to skb->next. 950 * During transmission, we will remove the successfully transmitted 951 * fragments from this list. When the low-level driver rejects one 952 * of the fragments then we will simply pretend to accept the skb 953 * but store it away as pending. 954 */ 955 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 956 return TX_DROP; 957 958 /* update duration/seq/flags of fragments */ 959 fragnum = 0; 960 961 skb_queue_walk(&tx->skbs, skb) { 962 int next_len; 963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 964 965 hdr = (void *)skb->data; 966 info = IEEE80211_SKB_CB(skb); 967 968 if (!skb_queue_is_last(&tx->skbs, skb)) { 969 hdr->frame_control |= morefrags; 970 /* 971 * No multi-rate retries for fragmented frames, that 972 * would completely throw off the NAV at other STAs. 973 */ 974 info->control.rates[1].idx = -1; 975 info->control.rates[2].idx = -1; 976 info->control.rates[3].idx = -1; 977 info->control.rates[4].idx = -1; 978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5); 979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 980 } else { 981 hdr->frame_control &= ~morefrags; 982 next_len = 0; 983 } 984 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 985 fragnum++; 986 } 987 988 return TX_CONTINUE; 989 } 990 991 static ieee80211_tx_result debug_noinline 992 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 993 { 994 struct sk_buff *skb; 995 996 if (!tx->sta) 997 return TX_CONTINUE; 998 999 tx->sta->tx_packets++; 1000 skb_queue_walk(&tx->skbs, skb) { 1001 tx->sta->tx_fragments++; 1002 tx->sta->tx_bytes += skb->len; 1003 } 1004 1005 return TX_CONTINUE; 1006 } 1007 1008 static ieee80211_tx_result debug_noinline 1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1010 { 1011 if (!tx->key) 1012 return TX_CONTINUE; 1013 1014 switch (tx->key->conf.cipher) { 1015 case WLAN_CIPHER_SUITE_WEP40: 1016 case WLAN_CIPHER_SUITE_WEP104: 1017 return ieee80211_crypto_wep_encrypt(tx); 1018 case WLAN_CIPHER_SUITE_TKIP: 1019 return ieee80211_crypto_tkip_encrypt(tx); 1020 case WLAN_CIPHER_SUITE_CCMP: 1021 return ieee80211_crypto_ccmp_encrypt(tx); 1022 case WLAN_CIPHER_SUITE_AES_CMAC: 1023 return ieee80211_crypto_aes_cmac_encrypt(tx); 1024 default: 1025 return ieee80211_crypto_hw_encrypt(tx); 1026 } 1027 1028 return TX_DROP; 1029 } 1030 1031 static ieee80211_tx_result debug_noinline 1032 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1033 { 1034 struct sk_buff *skb; 1035 struct ieee80211_hdr *hdr; 1036 int next_len; 1037 bool group_addr; 1038 1039 skb_queue_walk(&tx->skbs, skb) { 1040 hdr = (void *) skb->data; 1041 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1042 break; /* must not overwrite AID */ 1043 if (!skb_queue_is_last(&tx->skbs, skb)) { 1044 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1045 next_len = next->len; 1046 } else 1047 next_len = 0; 1048 group_addr = is_multicast_ether_addr(hdr->addr1); 1049 1050 hdr->duration_id = 1051 ieee80211_duration(tx, skb, group_addr, next_len); 1052 } 1053 1054 return TX_CONTINUE; 1055 } 1056 1057 /* actual transmit path */ 1058 1059 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1060 struct sk_buff *skb, 1061 struct ieee80211_tx_info *info, 1062 struct tid_ampdu_tx *tid_tx, 1063 int tid) 1064 { 1065 bool queued = false; 1066 bool reset_agg_timer = false; 1067 struct sk_buff *purge_skb = NULL; 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 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1110 purge_skb = __skb_dequeue(&tid_tx->pending); 1111 } 1112 spin_unlock(&tx->sta->lock); 1113 1114 if (purge_skb) 1115 dev_kfree_skb(purge_skb); 1116 } 1117 1118 /* reset session timer */ 1119 if (reset_agg_timer && tid_tx->timeout) 1120 tid_tx->last_tx = jiffies; 1121 1122 return queued; 1123 } 1124 1125 /* 1126 * initialises @tx 1127 */ 1128 static ieee80211_tx_result 1129 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1130 struct ieee80211_tx_data *tx, 1131 struct sk_buff *skb) 1132 { 1133 struct ieee80211_local *local = sdata->local; 1134 struct ieee80211_hdr *hdr; 1135 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1136 int tid; 1137 u8 *qc; 1138 1139 memset(tx, 0, sizeof(*tx)); 1140 tx->skb = skb; 1141 tx->local = local; 1142 tx->sdata = sdata; 1143 tx->channel = local->hw.conf.channel; 1144 __skb_queue_head_init(&tx->skbs); 1145 1146 /* 1147 * If this flag is set to true anywhere, and we get here, 1148 * we are doing the needed processing, so remove the flag 1149 * now. 1150 */ 1151 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1152 1153 hdr = (struct ieee80211_hdr *) skb->data; 1154 1155 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1156 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1157 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1158 return TX_DROP; 1159 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1160 tx->sdata->control_port_protocol == tx->skb->protocol) { 1161 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1162 } 1163 if (!tx->sta) 1164 tx->sta = sta_info_get(sdata, hdr->addr1); 1165 1166 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1167 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1168 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1169 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1170 struct tid_ampdu_tx *tid_tx; 1171 1172 qc = ieee80211_get_qos_ctl(hdr); 1173 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1174 1175 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1176 if (tid_tx) { 1177 bool queued; 1178 1179 queued = ieee80211_tx_prep_agg(tx, skb, info, 1180 tid_tx, tid); 1181 1182 if (unlikely(queued)) 1183 return TX_QUEUED; 1184 } 1185 } 1186 1187 if (is_multicast_ether_addr(hdr->addr1)) { 1188 tx->flags &= ~IEEE80211_TX_UNICAST; 1189 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1190 } else 1191 tx->flags |= IEEE80211_TX_UNICAST; 1192 1193 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1194 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1195 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1196 info->flags & IEEE80211_TX_CTL_AMPDU) 1197 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1198 } 1199 1200 if (!tx->sta) 1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1202 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1203 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1204 1205 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1206 1207 return TX_CONTINUE; 1208 } 1209 1210 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1211 struct ieee80211_vif *vif, 1212 struct ieee80211_sta *sta, 1213 struct sk_buff_head *skbs, 1214 bool txpending) 1215 { 1216 struct sk_buff *skb, *tmp; 1217 unsigned long flags; 1218 1219 skb_queue_walk_safe(skbs, skb, tmp) { 1220 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1221 int q = info->hw_queue; 1222 1223 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1224 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1225 __skb_unlink(skb, skbs); 1226 dev_kfree_skb(skb); 1227 continue; 1228 } 1229 #endif 1230 1231 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1232 if (local->queue_stop_reasons[q] || 1233 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1234 /* 1235 * Since queue is stopped, queue up frames for later 1236 * transmission from the tx-pending tasklet when the 1237 * queue is woken again. 1238 */ 1239 if (txpending) 1240 skb_queue_splice_init(skbs, &local->pending[q]); 1241 else 1242 skb_queue_splice_tail_init(skbs, 1243 &local->pending[q]); 1244 1245 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1246 flags); 1247 return false; 1248 } 1249 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1250 1251 info->control.vif = vif; 1252 info->control.sta = sta; 1253 1254 __skb_unlink(skb, skbs); 1255 drv_tx(local, skb); 1256 } 1257 1258 return true; 1259 } 1260 1261 /* 1262 * Returns false if the frame couldn't be transmitted but was queued instead. 1263 */ 1264 static bool __ieee80211_tx(struct ieee80211_local *local, 1265 struct sk_buff_head *skbs, int led_len, 1266 struct sta_info *sta, bool txpending) 1267 { 1268 struct ieee80211_tx_info *info; 1269 struct ieee80211_sub_if_data *sdata; 1270 struct ieee80211_vif *vif; 1271 struct ieee80211_sta *pubsta; 1272 struct sk_buff *skb; 1273 bool result = true; 1274 __le16 fc; 1275 1276 if (WARN_ON(skb_queue_empty(skbs))) 1277 return true; 1278 1279 skb = skb_peek(skbs); 1280 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1281 info = IEEE80211_SKB_CB(skb); 1282 sdata = vif_to_sdata(info->control.vif); 1283 if (sta && !sta->uploaded) 1284 sta = NULL; 1285 1286 if (sta) 1287 pubsta = &sta->sta; 1288 else 1289 pubsta = NULL; 1290 1291 switch (sdata->vif.type) { 1292 case NL80211_IFTYPE_MONITOR: 1293 sdata = rcu_dereference(local->monitor_sdata); 1294 if (sdata) { 1295 vif = &sdata->vif; 1296 info->hw_queue = 1297 vif->hw_queue[skb_get_queue_mapping(skb)]; 1298 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1299 dev_kfree_skb(skb); 1300 return true; 1301 } else 1302 vif = NULL; 1303 break; 1304 case NL80211_IFTYPE_AP_VLAN: 1305 sdata = container_of(sdata->bss, 1306 struct ieee80211_sub_if_data, u.ap); 1307 /* fall through */ 1308 default: 1309 vif = &sdata->vif; 1310 break; 1311 } 1312 1313 if (local->ops->tx_frags) 1314 drv_tx_frags(local, vif, pubsta, skbs); 1315 else 1316 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1317 txpending); 1318 1319 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1320 ieee80211_led_tx(local, 1); 1321 1322 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1323 1324 return result; 1325 } 1326 1327 /* 1328 * Invoke TX handlers, return 0 on success and non-zero if the 1329 * frame was dropped or queued. 1330 */ 1331 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1332 { 1333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1334 ieee80211_tx_result res = TX_DROP; 1335 1336 #define CALL_TXH(txh) \ 1337 do { \ 1338 res = txh(tx); \ 1339 if (res != TX_CONTINUE) \ 1340 goto txh_done; \ 1341 } while (0) 1342 1343 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1344 CALL_TXH(ieee80211_tx_h_check_assoc); 1345 CALL_TXH(ieee80211_tx_h_ps_buf); 1346 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1347 CALL_TXH(ieee80211_tx_h_select_key); 1348 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1349 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1350 1351 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1352 __skb_queue_tail(&tx->skbs, tx->skb); 1353 tx->skb = NULL; 1354 goto txh_done; 1355 } 1356 1357 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1358 CALL_TXH(ieee80211_tx_h_sequence); 1359 CALL_TXH(ieee80211_tx_h_fragment); 1360 /* handlers after fragment must be aware of tx info fragmentation! */ 1361 CALL_TXH(ieee80211_tx_h_stats); 1362 CALL_TXH(ieee80211_tx_h_encrypt); 1363 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1364 CALL_TXH(ieee80211_tx_h_calculate_duration); 1365 #undef CALL_TXH 1366 1367 txh_done: 1368 if (unlikely(res == TX_DROP)) { 1369 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1370 if (tx->skb) 1371 dev_kfree_skb(tx->skb); 1372 else 1373 __skb_queue_purge(&tx->skbs); 1374 return -1; 1375 } else if (unlikely(res == TX_QUEUED)) { 1376 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1377 return -1; 1378 } 1379 1380 return 0; 1381 } 1382 1383 /* 1384 * Returns false if the frame couldn't be transmitted but was queued instead. 1385 */ 1386 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1387 struct sk_buff *skb, bool txpending) 1388 { 1389 struct ieee80211_local *local = sdata->local; 1390 struct ieee80211_tx_data tx; 1391 ieee80211_tx_result res_prepare; 1392 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1393 bool result = true; 1394 int led_len; 1395 1396 if (unlikely(skb->len < 10)) { 1397 dev_kfree_skb(skb); 1398 return true; 1399 } 1400 1401 rcu_read_lock(); 1402 1403 /* initialises tx */ 1404 led_len = skb->len; 1405 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1406 1407 if (unlikely(res_prepare == TX_DROP)) { 1408 dev_kfree_skb(skb); 1409 goto out; 1410 } else if (unlikely(res_prepare == TX_QUEUED)) { 1411 goto out; 1412 } 1413 1414 tx.channel = local->hw.conf.channel; 1415 info->band = tx.channel->band; 1416 1417 /* set up hw_queue value early */ 1418 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1419 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1420 info->hw_queue = 1421 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1422 1423 if (!invoke_tx_handlers(&tx)) 1424 result = __ieee80211_tx(local, &tx.skbs, led_len, 1425 tx.sta, txpending); 1426 out: 1427 rcu_read_unlock(); 1428 return result; 1429 } 1430 1431 /* device xmit handlers */ 1432 1433 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1434 struct sk_buff *skb, 1435 int head_need, bool may_encrypt) 1436 { 1437 struct ieee80211_local *local = sdata->local; 1438 int tail_need = 0; 1439 1440 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1441 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1442 tail_need -= skb_tailroom(skb); 1443 tail_need = max_t(int, tail_need, 0); 1444 } 1445 1446 if (skb_cloned(skb)) 1447 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1448 else if (head_need || tail_need) 1449 I802_DEBUG_INC(local->tx_expand_skb_head); 1450 else 1451 return 0; 1452 1453 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1454 wiphy_debug(local->hw.wiphy, 1455 "failed to reallocate TX buffer\n"); 1456 return -ENOMEM; 1457 } 1458 1459 return 0; 1460 } 1461 1462 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 1463 { 1464 struct ieee80211_local *local = sdata->local; 1465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1467 int headroom; 1468 bool may_encrypt; 1469 1470 rcu_read_lock(); 1471 1472 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1473 1474 headroom = local->tx_headroom; 1475 if (may_encrypt) 1476 headroom += IEEE80211_ENCRYPT_HEADROOM; 1477 headroom -= skb_headroom(skb); 1478 headroom = max_t(int, 0, headroom); 1479 1480 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1481 dev_kfree_skb(skb); 1482 rcu_read_unlock(); 1483 return; 1484 } 1485 1486 hdr = (struct ieee80211_hdr *) skb->data; 1487 info->control.vif = &sdata->vif; 1488 1489 if (ieee80211_vif_is_mesh(&sdata->vif) && 1490 ieee80211_is_data(hdr->frame_control) && 1491 !is_multicast_ether_addr(hdr->addr1) && 1492 mesh_nexthop_resolve(skb, sdata)) { 1493 /* skb queued: don't free */ 1494 rcu_read_unlock(); 1495 return; 1496 } 1497 1498 ieee80211_set_qos_hdr(sdata, skb); 1499 ieee80211_tx(sdata, skb, false); 1500 rcu_read_unlock(); 1501 } 1502 1503 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1504 { 1505 struct ieee80211_radiotap_iterator iterator; 1506 struct ieee80211_radiotap_header *rthdr = 1507 (struct ieee80211_radiotap_header *) skb->data; 1508 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1509 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1510 NULL); 1511 u16 txflags; 1512 1513 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1514 IEEE80211_TX_CTL_DONTFRAG; 1515 1516 /* 1517 * for every radiotap entry that is present 1518 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1519 * entries present, or -EINVAL on error) 1520 */ 1521 1522 while (!ret) { 1523 ret = ieee80211_radiotap_iterator_next(&iterator); 1524 1525 if (ret) 1526 continue; 1527 1528 /* see if this argument is something we can use */ 1529 switch (iterator.this_arg_index) { 1530 /* 1531 * You must take care when dereferencing iterator.this_arg 1532 * for multibyte types... the pointer is not aligned. Use 1533 * get_unaligned((type *)iterator.this_arg) to dereference 1534 * iterator.this_arg for type "type" safely on all arches. 1535 */ 1536 case IEEE80211_RADIOTAP_FLAGS: 1537 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1538 /* 1539 * this indicates that the skb we have been 1540 * handed has the 32-bit FCS CRC at the end... 1541 * we should react to that by snipping it off 1542 * because it will be recomputed and added 1543 * on transmission 1544 */ 1545 if (skb->len < (iterator._max_length + FCS_LEN)) 1546 return false; 1547 1548 skb_trim(skb, skb->len - FCS_LEN); 1549 } 1550 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1551 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1552 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1553 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1554 break; 1555 1556 case IEEE80211_RADIOTAP_TX_FLAGS: 1557 txflags = get_unaligned_le16(iterator.this_arg); 1558 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1559 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1560 break; 1561 1562 /* 1563 * Please update the file 1564 * Documentation/networking/mac80211-injection.txt 1565 * when parsing new fields here. 1566 */ 1567 1568 default: 1569 break; 1570 } 1571 } 1572 1573 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1574 return false; 1575 1576 /* 1577 * remove the radiotap header 1578 * iterator->_max_length was sanity-checked against 1579 * skb->len by iterator init 1580 */ 1581 skb_pull(skb, iterator._max_length); 1582 1583 return true; 1584 } 1585 1586 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1587 struct net_device *dev) 1588 { 1589 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1590 struct ieee80211_channel *chan = local->hw.conf.channel; 1591 struct ieee80211_radiotap_header *prthdr = 1592 (struct ieee80211_radiotap_header *)skb->data; 1593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1594 struct ieee80211_hdr *hdr; 1595 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1596 u16 len_rthdr; 1597 int hdrlen; 1598 1599 /* 1600 * Frame injection is not allowed if beaconing is not allowed 1601 * or if we need radar detection. Beaconing is usually not allowed when 1602 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1603 * Passive scan is also used in world regulatory domains where 1604 * your country is not known and as such it should be treated as 1605 * NO TX unless the channel is explicitly allowed in which case 1606 * your current regulatory domain would not have the passive scan 1607 * flag. 1608 * 1609 * Since AP mode uses monitor interfaces to inject/TX management 1610 * frames we can make AP mode the exception to this rule once it 1611 * supports radar detection as its implementation can deal with 1612 * radar detection by itself. We can do that later by adding a 1613 * monitor flag interfaces used for AP support. 1614 */ 1615 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1616 IEEE80211_CHAN_PASSIVE_SCAN))) 1617 goto fail; 1618 1619 /* check for not even having the fixed radiotap header part */ 1620 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1621 goto fail; /* too short to be possibly valid */ 1622 1623 /* is it a header version we can trust to find length from? */ 1624 if (unlikely(prthdr->it_version)) 1625 goto fail; /* only version 0 is supported */ 1626 1627 /* then there must be a radiotap header with a length we can use */ 1628 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1629 1630 /* does the skb contain enough to deliver on the alleged length? */ 1631 if (unlikely(skb->len < len_rthdr)) 1632 goto fail; /* skb too short for claimed rt header extent */ 1633 1634 /* 1635 * fix up the pointers accounting for the radiotap 1636 * header still being in there. We are being given 1637 * a precooked IEEE80211 header so no need for 1638 * normal processing 1639 */ 1640 skb_set_mac_header(skb, len_rthdr); 1641 /* 1642 * these are just fixed to the end of the rt area since we 1643 * don't have any better information and at this point, nobody cares 1644 */ 1645 skb_set_network_header(skb, len_rthdr); 1646 skb_set_transport_header(skb, len_rthdr); 1647 1648 if (skb->len < len_rthdr + 2) 1649 goto fail; 1650 1651 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1652 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1653 1654 if (skb->len < len_rthdr + hdrlen) 1655 goto fail; 1656 1657 /* 1658 * Initialize skb->protocol if the injected frame is a data frame 1659 * carrying a rfc1042 header 1660 */ 1661 if (ieee80211_is_data(hdr->frame_control) && 1662 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1663 u8 *payload = (u8 *)hdr + hdrlen; 1664 1665 if (ether_addr_equal(payload, rfc1042_header)) 1666 skb->protocol = cpu_to_be16((payload[6] << 8) | 1667 payload[7]); 1668 } 1669 1670 memset(info, 0, sizeof(*info)); 1671 1672 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1673 IEEE80211_TX_CTL_INJECTED; 1674 1675 /* process and remove the injection radiotap header */ 1676 if (!ieee80211_parse_tx_radiotap(skb)) 1677 goto fail; 1678 1679 rcu_read_lock(); 1680 1681 /* 1682 * We process outgoing injected frames that have a local address 1683 * we handle as though they are non-injected frames. 1684 * This code here isn't entirely correct, the local MAC address 1685 * isn't always enough to find the interface to use; for proper 1686 * VLAN/WDS support we will need a different mechanism (which 1687 * likely isn't going to be monitor interfaces). 1688 */ 1689 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1690 1691 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1692 if (!ieee80211_sdata_running(tmp_sdata)) 1693 continue; 1694 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1695 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1696 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1697 continue; 1698 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1699 sdata = tmp_sdata; 1700 break; 1701 } 1702 } 1703 1704 ieee80211_xmit(sdata, skb); 1705 rcu_read_unlock(); 1706 1707 return NETDEV_TX_OK; 1708 1709 fail: 1710 dev_kfree_skb(skb); 1711 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1712 } 1713 1714 /** 1715 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1716 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1717 * @skb: packet to be sent 1718 * @dev: incoming interface 1719 * 1720 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1721 * not be freed, and caller is responsible for either retrying later or freeing 1722 * skb). 1723 * 1724 * This function takes in an Ethernet header and encapsulates it with suitable 1725 * IEEE 802.11 header based on which interface the packet is coming in. The 1726 * encapsulated packet will then be passed to master interface, wlan#.11, for 1727 * transmission (through low-level driver). 1728 */ 1729 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1730 struct net_device *dev) 1731 { 1732 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1733 struct ieee80211_local *local = sdata->local; 1734 struct ieee80211_tx_info *info; 1735 int ret = NETDEV_TX_BUSY, head_need; 1736 u16 ethertype, hdrlen, meshhdrlen = 0; 1737 __le16 fc; 1738 struct ieee80211_hdr hdr; 1739 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1740 struct mesh_path __maybe_unused *mppath = NULL; 1741 const u8 *encaps_data; 1742 int encaps_len, skip_header_bytes; 1743 int nh_pos, h_pos; 1744 struct sta_info *sta = NULL; 1745 bool wme_sta = false, authorized = false, tdls_auth = false; 1746 bool tdls_direct = false; 1747 bool multicast; 1748 u32 info_flags = 0; 1749 u16 info_id = 0; 1750 1751 if (unlikely(skb->len < ETH_HLEN)) { 1752 ret = NETDEV_TX_OK; 1753 goto fail; 1754 } 1755 1756 /* convert Ethernet header to proper 802.11 header (based on 1757 * operation mode) */ 1758 ethertype = (skb->data[12] << 8) | skb->data[13]; 1759 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1760 1761 switch (sdata->vif.type) { 1762 case NL80211_IFTYPE_AP_VLAN: 1763 rcu_read_lock(); 1764 sta = rcu_dereference(sdata->u.vlan.sta); 1765 if (sta) { 1766 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1767 /* RA TA DA SA */ 1768 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1769 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1770 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1771 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1772 hdrlen = 30; 1773 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1774 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1775 } 1776 rcu_read_unlock(); 1777 if (sta) 1778 break; 1779 /* fall through */ 1780 case NL80211_IFTYPE_AP: 1781 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1782 /* DA BSSID SA */ 1783 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1784 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1785 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1786 hdrlen = 24; 1787 break; 1788 case NL80211_IFTYPE_WDS: 1789 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1790 /* RA TA DA SA */ 1791 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1792 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1793 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1794 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1795 hdrlen = 30; 1796 break; 1797 #ifdef CONFIG_MAC80211_MESH 1798 case NL80211_IFTYPE_MESH_POINT: 1799 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1800 /* Do not send frames with mesh_ttl == 0 */ 1801 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1802 ret = NETDEV_TX_OK; 1803 goto fail; 1804 } 1805 rcu_read_lock(); 1806 if (!is_multicast_ether_addr(skb->data)) 1807 mppath = mpp_path_lookup(skb->data, sdata); 1808 1809 /* 1810 * Use address extension if it is a packet from 1811 * another interface or if we know the destination 1812 * is being proxied by a portal (i.e. portal address 1813 * differs from proxied address) 1814 */ 1815 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1816 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1817 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1818 skb->data, skb->data + ETH_ALEN); 1819 rcu_read_unlock(); 1820 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1821 sdata, NULL, NULL); 1822 } else { 1823 int is_mesh_mcast = 1; 1824 const u8 *mesh_da; 1825 1826 if (is_multicast_ether_addr(skb->data)) 1827 /* DA TA mSA AE:SA */ 1828 mesh_da = skb->data; 1829 else { 1830 static const u8 bcast[ETH_ALEN] = 1831 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1832 if (mppath) { 1833 /* RA TA mDA mSA AE:DA SA */ 1834 mesh_da = mppath->mpp; 1835 is_mesh_mcast = 0; 1836 } else { 1837 /* DA TA mSA AE:SA */ 1838 mesh_da = bcast; 1839 } 1840 } 1841 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1842 mesh_da, sdata->vif.addr); 1843 rcu_read_unlock(); 1844 if (is_mesh_mcast) 1845 meshhdrlen = 1846 ieee80211_new_mesh_header(&mesh_hdr, 1847 sdata, 1848 skb->data + ETH_ALEN, 1849 NULL); 1850 else 1851 meshhdrlen = 1852 ieee80211_new_mesh_header(&mesh_hdr, 1853 sdata, 1854 skb->data, 1855 skb->data + ETH_ALEN); 1856 1857 } 1858 break; 1859 #endif 1860 case NL80211_IFTYPE_STATION: 1861 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1862 bool tdls_peer = false; 1863 1864 rcu_read_lock(); 1865 sta = sta_info_get(sdata, skb->data); 1866 if (sta) { 1867 authorized = test_sta_flag(sta, 1868 WLAN_STA_AUTHORIZED); 1869 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1870 tdls_peer = test_sta_flag(sta, 1871 WLAN_STA_TDLS_PEER); 1872 tdls_auth = test_sta_flag(sta, 1873 WLAN_STA_TDLS_PEER_AUTH); 1874 } 1875 rcu_read_unlock(); 1876 1877 /* 1878 * If the TDLS link is enabled, send everything 1879 * directly. Otherwise, allow TDLS setup frames 1880 * to be transmitted indirectly. 1881 */ 1882 tdls_direct = tdls_peer && (tdls_auth || 1883 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1884 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1885 } 1886 1887 if (tdls_direct) { 1888 /* link during setup - throw out frames to peer */ 1889 if (!tdls_auth) { 1890 ret = NETDEV_TX_OK; 1891 goto fail; 1892 } 1893 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.mgd.bssid, ETH_ALEN); 1898 hdrlen = 24; 1899 } else if (sdata->u.mgd.use_4addr && 1900 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1901 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1902 IEEE80211_FCTL_TODS); 1903 /* RA TA DA SA */ 1904 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1905 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1906 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1907 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1908 hdrlen = 30; 1909 } else { 1910 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1911 /* BSSID SA DA */ 1912 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1913 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1914 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1915 hdrlen = 24; 1916 } 1917 break; 1918 case NL80211_IFTYPE_ADHOC: 1919 /* DA SA BSSID */ 1920 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1921 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1922 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1923 hdrlen = 24; 1924 break; 1925 default: 1926 ret = NETDEV_TX_OK; 1927 goto fail; 1928 } 1929 1930 /* 1931 * There's no need to try to look up the destination 1932 * if it is a multicast address (which can only happen 1933 * in AP mode) 1934 */ 1935 multicast = is_multicast_ether_addr(hdr.addr1); 1936 if (!multicast) { 1937 rcu_read_lock(); 1938 sta = sta_info_get(sdata, hdr.addr1); 1939 if (sta) { 1940 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1941 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1942 } 1943 rcu_read_unlock(); 1944 } 1945 1946 /* For mesh, the use of the QoS header is mandatory */ 1947 if (ieee80211_vif_is_mesh(&sdata->vif)) 1948 wme_sta = true; 1949 1950 /* receiver and we are QoS enabled, use a QoS type frame */ 1951 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1952 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1953 hdrlen += 2; 1954 } 1955 1956 /* 1957 * Drop unicast frames to unauthorised stations unless they are 1958 * EAPOL frames from the local station. 1959 */ 1960 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1961 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1962 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1963 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1964 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1965 net_dbg_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 1966 dev->name, hdr.addr1); 1967 #endif 1968 1969 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1970 1971 ret = NETDEV_TX_OK; 1972 goto fail; 1973 } 1974 1975 if (unlikely(!multicast && skb->sk && 1976 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1977 struct sk_buff *orig_skb = skb; 1978 1979 skb = skb_clone(skb, GFP_ATOMIC); 1980 if (skb) { 1981 unsigned long flags; 1982 int id, r; 1983 1984 spin_lock_irqsave(&local->ack_status_lock, flags); 1985 r = idr_get_new_above(&local->ack_status_frames, 1986 orig_skb, 1, &id); 1987 if (r == -EAGAIN) { 1988 idr_pre_get(&local->ack_status_frames, 1989 GFP_ATOMIC); 1990 r = idr_get_new_above(&local->ack_status_frames, 1991 orig_skb, 1, &id); 1992 } 1993 if (WARN_ON(!id) || id > 0xffff) { 1994 idr_remove(&local->ack_status_frames, id); 1995 r = -ERANGE; 1996 } 1997 spin_unlock_irqrestore(&local->ack_status_lock, flags); 1998 1999 if (!r) { 2000 info_id = id; 2001 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2002 } else if (skb_shared(skb)) { 2003 kfree_skb(orig_skb); 2004 } else { 2005 kfree_skb(skb); 2006 skb = orig_skb; 2007 } 2008 } else { 2009 /* couldn't clone -- lose tx status ... */ 2010 skb = orig_skb; 2011 } 2012 } 2013 2014 /* 2015 * If the skb is shared we need to obtain our own copy. 2016 */ 2017 if (skb_shared(skb)) { 2018 struct sk_buff *tmp_skb = skb; 2019 2020 /* can't happen -- skb is a clone if info_id != 0 */ 2021 WARN_ON(info_id); 2022 2023 skb = skb_clone(skb, GFP_ATOMIC); 2024 kfree_skb(tmp_skb); 2025 2026 if (!skb) { 2027 ret = NETDEV_TX_OK; 2028 goto fail; 2029 } 2030 } 2031 2032 hdr.frame_control = fc; 2033 hdr.duration_id = 0; 2034 hdr.seq_ctrl = 0; 2035 2036 skip_header_bytes = ETH_HLEN; 2037 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2038 encaps_data = bridge_tunnel_header; 2039 encaps_len = sizeof(bridge_tunnel_header); 2040 skip_header_bytes -= 2; 2041 } else if (ethertype >= 0x600) { 2042 encaps_data = rfc1042_header; 2043 encaps_len = sizeof(rfc1042_header); 2044 skip_header_bytes -= 2; 2045 } else { 2046 encaps_data = NULL; 2047 encaps_len = 0; 2048 } 2049 2050 nh_pos = skb_network_header(skb) - skb->data; 2051 h_pos = skb_transport_header(skb) - skb->data; 2052 2053 skb_pull(skb, skip_header_bytes); 2054 nh_pos -= skip_header_bytes; 2055 h_pos -= skip_header_bytes; 2056 2057 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2058 2059 /* 2060 * So we need to modify the skb header and hence need a copy of 2061 * that. The head_need variable above doesn't, so far, include 2062 * the needed header space that we don't need right away. If we 2063 * can, then we don't reallocate right now but only after the 2064 * frame arrives at the master device (if it does...) 2065 * 2066 * If we cannot, however, then we will reallocate to include all 2067 * the ever needed space. Also, if we need to reallocate it anyway, 2068 * make it big enough for everything we may ever need. 2069 */ 2070 2071 if (head_need > 0 || skb_cloned(skb)) { 2072 head_need += IEEE80211_ENCRYPT_HEADROOM; 2073 head_need += local->tx_headroom; 2074 head_need = max_t(int, 0, head_need); 2075 if (ieee80211_skb_resize(sdata, skb, head_need, true)) 2076 goto fail; 2077 } 2078 2079 if (encaps_data) { 2080 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2081 nh_pos += encaps_len; 2082 h_pos += encaps_len; 2083 } 2084 2085 #ifdef CONFIG_MAC80211_MESH 2086 if (meshhdrlen > 0) { 2087 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2088 nh_pos += meshhdrlen; 2089 h_pos += meshhdrlen; 2090 } 2091 #endif 2092 2093 if (ieee80211_is_data_qos(fc)) { 2094 __le16 *qos_control; 2095 2096 qos_control = (__le16*) skb_push(skb, 2); 2097 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2098 /* 2099 * Maybe we could actually set some fields here, for now just 2100 * initialise to zero to indicate no special operation. 2101 */ 2102 *qos_control = 0; 2103 } else 2104 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2105 2106 nh_pos += hdrlen; 2107 h_pos += hdrlen; 2108 2109 dev->stats.tx_packets++; 2110 dev->stats.tx_bytes += skb->len; 2111 2112 /* Update skb pointers to various headers since this modified frame 2113 * is going to go through Linux networking code that may potentially 2114 * need things like pointer to IP header. */ 2115 skb_set_mac_header(skb, 0); 2116 skb_set_network_header(skb, nh_pos); 2117 skb_set_transport_header(skb, h_pos); 2118 2119 info = IEEE80211_SKB_CB(skb); 2120 memset(info, 0, sizeof(*info)); 2121 2122 dev->trans_start = jiffies; 2123 2124 info->flags = info_flags; 2125 info->ack_frame_id = info_id; 2126 2127 ieee80211_xmit(sdata, skb); 2128 2129 return NETDEV_TX_OK; 2130 2131 fail: 2132 if (ret == NETDEV_TX_OK) 2133 dev_kfree_skb(skb); 2134 2135 return ret; 2136 } 2137 2138 2139 /* 2140 * ieee80211_clear_tx_pending may not be called in a context where 2141 * it is possible that it packets could come in again. 2142 */ 2143 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2144 { 2145 int i; 2146 2147 for (i = 0; i < local->hw.queues; i++) 2148 skb_queue_purge(&local->pending[i]); 2149 } 2150 2151 /* 2152 * Returns false if the frame couldn't be transmitted but was queued instead, 2153 * which in this case means re-queued -- take as an indication to stop sending 2154 * more pending frames. 2155 */ 2156 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2157 struct sk_buff *skb) 2158 { 2159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2160 struct ieee80211_sub_if_data *sdata; 2161 struct sta_info *sta; 2162 struct ieee80211_hdr *hdr; 2163 bool result; 2164 2165 sdata = vif_to_sdata(info->control.vif); 2166 2167 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2168 result = ieee80211_tx(sdata, skb, true); 2169 } else { 2170 struct sk_buff_head skbs; 2171 2172 __skb_queue_head_init(&skbs); 2173 __skb_queue_tail(&skbs, skb); 2174 2175 hdr = (struct ieee80211_hdr *)skb->data; 2176 sta = sta_info_get(sdata, hdr->addr1); 2177 2178 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2179 } 2180 2181 return result; 2182 } 2183 2184 /* 2185 * Transmit all pending packets. Called from tasklet. 2186 */ 2187 void ieee80211_tx_pending(unsigned long data) 2188 { 2189 struct ieee80211_local *local = (struct ieee80211_local *)data; 2190 unsigned long flags; 2191 int i; 2192 bool txok; 2193 2194 rcu_read_lock(); 2195 2196 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2197 for (i = 0; i < local->hw.queues; i++) { 2198 /* 2199 * If queue is stopped by something other than due to pending 2200 * frames, or we have no pending frames, proceed to next queue. 2201 */ 2202 if (local->queue_stop_reasons[i] || 2203 skb_queue_empty(&local->pending[i])) 2204 continue; 2205 2206 while (!skb_queue_empty(&local->pending[i])) { 2207 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2208 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2209 2210 if (WARN_ON(!info->control.vif)) { 2211 kfree_skb(skb); 2212 continue; 2213 } 2214 2215 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2216 flags); 2217 2218 txok = ieee80211_tx_pending_skb(local, skb); 2219 spin_lock_irqsave(&local->queue_stop_reason_lock, 2220 flags); 2221 if (!txok) 2222 break; 2223 } 2224 2225 if (skb_queue_empty(&local->pending[i])) 2226 ieee80211_propagate_queue_wake(local, i); 2227 } 2228 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2229 2230 rcu_read_unlock(); 2231 } 2232 2233 /* functions for drivers to get certain frames */ 2234 2235 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2236 struct ieee80211_if_ap *bss, 2237 struct sk_buff *skb, 2238 struct beacon_data *beacon) 2239 { 2240 u8 *pos, *tim; 2241 int aid0 = 0; 2242 int i, have_bits = 0, n1, n2; 2243 2244 /* Generate bitmap for TIM only if there are any STAs in power save 2245 * mode. */ 2246 if (atomic_read(&bss->num_sta_ps) > 0) 2247 /* in the hope that this is faster than 2248 * checking byte-for-byte */ 2249 have_bits = !bitmap_empty((unsigned long*)bss->tim, 2250 IEEE80211_MAX_AID+1); 2251 2252 if (bss->dtim_count == 0) 2253 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2254 else 2255 bss->dtim_count--; 2256 2257 tim = pos = (u8 *) skb_put(skb, 6); 2258 *pos++ = WLAN_EID_TIM; 2259 *pos++ = 4; 2260 *pos++ = bss->dtim_count; 2261 *pos++ = sdata->vif.bss_conf.dtim_period; 2262 2263 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 2264 aid0 = 1; 2265 2266 bss->dtim_bc_mc = aid0 == 1; 2267 2268 if (have_bits) { 2269 /* Find largest even number N1 so that bits numbered 1 through 2270 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2271 * (N2 + 1) x 8 through 2007 are 0. */ 2272 n1 = 0; 2273 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2274 if (bss->tim[i]) { 2275 n1 = i & 0xfe; 2276 break; 2277 } 2278 } 2279 n2 = n1; 2280 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2281 if (bss->tim[i]) { 2282 n2 = i; 2283 break; 2284 } 2285 } 2286 2287 /* Bitmap control */ 2288 *pos++ = n1 | aid0; 2289 /* Part Virt Bitmap */ 2290 skb_put(skb, n2 - n1); 2291 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 2292 2293 tim[1] = n2 - n1 + 4; 2294 } else { 2295 *pos++ = aid0; /* Bitmap control */ 2296 *pos++ = 0; /* Part Virt Bitmap */ 2297 } 2298 } 2299 2300 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2301 struct ieee80211_vif *vif, 2302 u16 *tim_offset, u16 *tim_length) 2303 { 2304 struct ieee80211_local *local = hw_to_local(hw); 2305 struct sk_buff *skb = NULL; 2306 struct ieee80211_tx_info *info; 2307 struct ieee80211_sub_if_data *sdata = NULL; 2308 struct ieee80211_if_ap *ap = NULL; 2309 struct beacon_data *beacon; 2310 struct ieee80211_supported_band *sband; 2311 enum ieee80211_band band = local->hw.conf.channel->band; 2312 struct ieee80211_tx_rate_control txrc; 2313 2314 sband = local->hw.wiphy->bands[band]; 2315 2316 rcu_read_lock(); 2317 2318 sdata = vif_to_sdata(vif); 2319 2320 if (!ieee80211_sdata_running(sdata)) 2321 goto out; 2322 2323 if (tim_offset) 2324 *tim_offset = 0; 2325 if (tim_length) 2326 *tim_length = 0; 2327 2328 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2329 ap = &sdata->u.ap; 2330 beacon = rcu_dereference(ap->beacon); 2331 if (beacon) { 2332 /* 2333 * headroom, head length, 2334 * tail length and maximum TIM length 2335 */ 2336 skb = dev_alloc_skb(local->tx_headroom + 2337 beacon->head_len + 2338 beacon->tail_len + 256); 2339 if (!skb) 2340 goto out; 2341 2342 skb_reserve(skb, local->tx_headroom); 2343 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2344 beacon->head_len); 2345 2346 /* 2347 * Not very nice, but we want to allow the driver to call 2348 * ieee80211_beacon_get() as a response to the set_tim() 2349 * callback. That, however, is already invoked under the 2350 * sta_lock to guarantee consistent and race-free update 2351 * of the tim bitmap in mac80211 and the driver. 2352 */ 2353 if (local->tim_in_locked_section) { 2354 ieee80211_beacon_add_tim(sdata, ap, skb, 2355 beacon); 2356 } else { 2357 unsigned long flags; 2358 2359 spin_lock_irqsave(&local->tim_lock, flags); 2360 ieee80211_beacon_add_tim(sdata, ap, skb, 2361 beacon); 2362 spin_unlock_irqrestore(&local->tim_lock, flags); 2363 } 2364 2365 if (tim_offset) 2366 *tim_offset = beacon->head_len; 2367 if (tim_length) 2368 *tim_length = skb->len - beacon->head_len; 2369 2370 if (beacon->tail) 2371 memcpy(skb_put(skb, beacon->tail_len), 2372 beacon->tail, beacon->tail_len); 2373 } else 2374 goto out; 2375 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2376 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2377 struct ieee80211_hdr *hdr; 2378 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2379 2380 if (!presp) 2381 goto out; 2382 2383 skb = skb_copy(presp, GFP_ATOMIC); 2384 if (!skb) 2385 goto out; 2386 2387 hdr = (struct ieee80211_hdr *) skb->data; 2388 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2389 IEEE80211_STYPE_BEACON); 2390 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2391 struct ieee80211_mgmt *mgmt; 2392 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2393 u8 *pos; 2394 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2395 sizeof(mgmt->u.beacon); 2396 2397 #ifdef CONFIG_MAC80211_MESH 2398 if (!sdata->u.mesh.mesh_id_len) 2399 goto out; 2400 #endif 2401 2402 if (ifmsh->sync_ops) 2403 ifmsh->sync_ops->adjust_tbtt( 2404 sdata); 2405 2406 skb = dev_alloc_skb(local->tx_headroom + 2407 hdr_len + 2408 2 + /* NULL SSID */ 2409 2 + 8 + /* supported rates */ 2410 2 + 3 + /* DS params */ 2411 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2412 2 + sizeof(struct ieee80211_ht_cap) + 2413 2 + sizeof(struct ieee80211_ht_operation) + 2414 2 + sdata->u.mesh.mesh_id_len + 2415 2 + sizeof(struct ieee80211_meshconf_ie) + 2416 sdata->u.mesh.ie_len); 2417 if (!skb) 2418 goto out; 2419 2420 skb_reserve(skb, local->hw.extra_tx_headroom); 2421 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2422 memset(mgmt, 0, hdr_len); 2423 mgmt->frame_control = 2424 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2425 memset(mgmt->da, 0xff, ETH_ALEN); 2426 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2427 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2428 mgmt->u.beacon.beacon_int = 2429 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2430 mgmt->u.beacon.capab_info |= cpu_to_le16( 2431 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2432 2433 pos = skb_put(skb, 2); 2434 *pos++ = WLAN_EID_SSID; 2435 *pos++ = 0x0; 2436 2437 if (ieee80211_add_srates_ie(&sdata->vif, skb, true) || 2438 mesh_add_ds_params_ie(skb, sdata) || 2439 ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) || 2440 mesh_add_rsn_ie(skb, sdata) || 2441 mesh_add_ht_cap_ie(skb, sdata) || 2442 mesh_add_ht_oper_ie(skb, sdata) || 2443 mesh_add_meshid_ie(skb, sdata) || 2444 mesh_add_meshconf_ie(skb, sdata) || 2445 mesh_add_vendor_ies(skb, sdata)) { 2446 pr_err("o11s: couldn't add ies!\n"); 2447 goto out; 2448 } 2449 } else { 2450 WARN_ON(1); 2451 goto out; 2452 } 2453 2454 info = IEEE80211_SKB_CB(skb); 2455 2456 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2457 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2458 info->band = band; 2459 2460 memset(&txrc, 0, sizeof(txrc)); 2461 txrc.hw = hw; 2462 txrc.sband = sband; 2463 txrc.bss_conf = &sdata->vif.bss_conf; 2464 txrc.skb = skb; 2465 txrc.reported_rate.idx = -1; 2466 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2467 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 2468 txrc.max_rate_idx = -1; 2469 else 2470 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2471 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2472 sizeof(txrc.rate_idx_mcs_mask)); 2473 txrc.bss = true; 2474 rate_control_get_rate(sdata, NULL, &txrc); 2475 2476 info->control.vif = vif; 2477 2478 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2479 IEEE80211_TX_CTL_ASSIGN_SEQ | 2480 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2481 out: 2482 rcu_read_unlock(); 2483 return skb; 2484 } 2485 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2486 2487 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2488 struct ieee80211_vif *vif) 2489 { 2490 struct ieee80211_if_ap *ap = NULL; 2491 struct sk_buff *presp = NULL, *skb = NULL; 2492 struct ieee80211_hdr *hdr; 2493 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2494 2495 if (sdata->vif.type != NL80211_IFTYPE_AP) 2496 return NULL; 2497 2498 rcu_read_lock(); 2499 2500 ap = &sdata->u.ap; 2501 presp = rcu_dereference(ap->probe_resp); 2502 if (!presp) 2503 goto out; 2504 2505 skb = skb_copy(presp, GFP_ATOMIC); 2506 if (!skb) 2507 goto out; 2508 2509 hdr = (struct ieee80211_hdr *) skb->data; 2510 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2511 2512 out: 2513 rcu_read_unlock(); 2514 return skb; 2515 } 2516 EXPORT_SYMBOL(ieee80211_proberesp_get); 2517 2518 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2519 struct ieee80211_vif *vif) 2520 { 2521 struct ieee80211_sub_if_data *sdata; 2522 struct ieee80211_if_managed *ifmgd; 2523 struct ieee80211_pspoll *pspoll; 2524 struct ieee80211_local *local; 2525 struct sk_buff *skb; 2526 2527 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2528 return NULL; 2529 2530 sdata = vif_to_sdata(vif); 2531 ifmgd = &sdata->u.mgd; 2532 local = sdata->local; 2533 2534 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2535 if (!skb) 2536 return NULL; 2537 2538 skb_reserve(skb, local->hw.extra_tx_headroom); 2539 2540 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2541 memset(pspoll, 0, sizeof(*pspoll)); 2542 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2543 IEEE80211_STYPE_PSPOLL); 2544 pspoll->aid = cpu_to_le16(ifmgd->aid); 2545 2546 /* aid in PS-Poll has its two MSBs each set to 1 */ 2547 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2548 2549 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2550 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2551 2552 return skb; 2553 } 2554 EXPORT_SYMBOL(ieee80211_pspoll_get); 2555 2556 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2557 struct ieee80211_vif *vif) 2558 { 2559 struct ieee80211_hdr_3addr *nullfunc; 2560 struct ieee80211_sub_if_data *sdata; 2561 struct ieee80211_if_managed *ifmgd; 2562 struct ieee80211_local *local; 2563 struct sk_buff *skb; 2564 2565 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2566 return NULL; 2567 2568 sdata = vif_to_sdata(vif); 2569 ifmgd = &sdata->u.mgd; 2570 local = sdata->local; 2571 2572 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2573 if (!skb) 2574 return NULL; 2575 2576 skb_reserve(skb, local->hw.extra_tx_headroom); 2577 2578 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2579 sizeof(*nullfunc)); 2580 memset(nullfunc, 0, sizeof(*nullfunc)); 2581 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2582 IEEE80211_STYPE_NULLFUNC | 2583 IEEE80211_FCTL_TODS); 2584 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2585 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2586 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2587 2588 return skb; 2589 } 2590 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2591 2592 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2593 struct ieee80211_vif *vif, 2594 const u8 *ssid, size_t ssid_len, 2595 const u8 *ie, size_t ie_len) 2596 { 2597 struct ieee80211_sub_if_data *sdata; 2598 struct ieee80211_local *local; 2599 struct ieee80211_hdr_3addr *hdr; 2600 struct sk_buff *skb; 2601 size_t ie_ssid_len; 2602 u8 *pos; 2603 2604 sdata = vif_to_sdata(vif); 2605 local = sdata->local; 2606 ie_ssid_len = 2 + ssid_len; 2607 2608 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2609 ie_ssid_len + ie_len); 2610 if (!skb) 2611 return NULL; 2612 2613 skb_reserve(skb, local->hw.extra_tx_headroom); 2614 2615 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2616 memset(hdr, 0, sizeof(*hdr)); 2617 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2618 IEEE80211_STYPE_PROBE_REQ); 2619 memset(hdr->addr1, 0xff, ETH_ALEN); 2620 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2621 memset(hdr->addr3, 0xff, ETH_ALEN); 2622 2623 pos = skb_put(skb, ie_ssid_len); 2624 *pos++ = WLAN_EID_SSID; 2625 *pos++ = ssid_len; 2626 if (ssid_len) 2627 memcpy(pos, ssid, ssid_len); 2628 pos += ssid_len; 2629 2630 if (ie) { 2631 pos = skb_put(skb, ie_len); 2632 memcpy(pos, ie, ie_len); 2633 } 2634 2635 return skb; 2636 } 2637 EXPORT_SYMBOL(ieee80211_probereq_get); 2638 2639 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2640 const void *frame, size_t frame_len, 2641 const struct ieee80211_tx_info *frame_txctl, 2642 struct ieee80211_rts *rts) 2643 { 2644 const struct ieee80211_hdr *hdr = frame; 2645 2646 rts->frame_control = 2647 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2648 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2649 frame_txctl); 2650 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2651 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2652 } 2653 EXPORT_SYMBOL(ieee80211_rts_get); 2654 2655 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2656 const void *frame, size_t frame_len, 2657 const struct ieee80211_tx_info *frame_txctl, 2658 struct ieee80211_cts *cts) 2659 { 2660 const struct ieee80211_hdr *hdr = frame; 2661 2662 cts->frame_control = 2663 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2664 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2665 frame_len, frame_txctl); 2666 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2667 } 2668 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2669 2670 struct sk_buff * 2671 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2672 struct ieee80211_vif *vif) 2673 { 2674 struct ieee80211_local *local = hw_to_local(hw); 2675 struct sk_buff *skb = NULL; 2676 struct ieee80211_tx_data tx; 2677 struct ieee80211_sub_if_data *sdata; 2678 struct ieee80211_if_ap *bss = NULL; 2679 struct beacon_data *beacon; 2680 struct ieee80211_tx_info *info; 2681 2682 sdata = vif_to_sdata(vif); 2683 bss = &sdata->u.ap; 2684 2685 rcu_read_lock(); 2686 beacon = rcu_dereference(bss->beacon); 2687 2688 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) 2689 goto out; 2690 2691 if (bss->dtim_count != 0 || !bss->dtim_bc_mc) 2692 goto out; /* send buffered bc/mc only after DTIM beacon */ 2693 2694 while (1) { 2695 skb = skb_dequeue(&bss->ps_bc_buf); 2696 if (!skb) 2697 goto out; 2698 local->total_ps_buffered--; 2699 2700 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 2701 struct ieee80211_hdr *hdr = 2702 (struct ieee80211_hdr *) skb->data; 2703 /* more buffered multicast/broadcast frames ==> set 2704 * MoreData flag in IEEE 802.11 header to inform PS 2705 * STAs */ 2706 hdr->frame_control |= 2707 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2708 } 2709 2710 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2711 break; 2712 dev_kfree_skb_any(skb); 2713 } 2714 2715 info = IEEE80211_SKB_CB(skb); 2716 2717 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2718 tx.channel = local->hw.conf.channel; 2719 info->band = tx.channel->band; 2720 2721 if (invoke_tx_handlers(&tx)) 2722 skb = NULL; 2723 out: 2724 rcu_read_unlock(); 2725 2726 return skb; 2727 } 2728 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2729 2730 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 2731 struct sk_buff *skb, int tid) 2732 { 2733 int ac = ieee802_1d_to_ac[tid]; 2734 2735 skb_set_mac_header(skb, 0); 2736 skb_set_network_header(skb, 0); 2737 skb_set_transport_header(skb, 0); 2738 2739 skb_set_queue_mapping(skb, ac); 2740 skb->priority = tid; 2741 2742 /* 2743 * The other path calling ieee80211_xmit is from the tasklet, 2744 * and while we can handle concurrent transmissions locking 2745 * requirements are that we do not come into tx with bhs on. 2746 */ 2747 local_bh_disable(); 2748 ieee80211_xmit(sdata, skb); 2749 local_bh_enable(); 2750 } 2751