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[info->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_BAND_60GHZ: 144 /* TODO, for now fall through */ 145 case IEEE80211_NUM_BANDS: 146 WARN_ON(1); 147 break; 148 } 149 } 150 if (rate == -1) { 151 /* No matching basic rate found; use highest suitable mandatory 152 * PHY rate */ 153 rate = mrate; 154 } 155 156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 157 if (ieee80211_is_data_qos(hdr->frame_control) && 158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 159 dur = 0; 160 else 161 /* Time needed to transmit ACK 162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 163 * to closest integer */ 164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 165 tx->sdata->vif.bss_conf.use_short_preamble); 166 167 if (next_frag_len) { 168 /* Frame is fragmented: duration increases with time needed to 169 * transmit next fragment plus ACK and 2 x SIFS. */ 170 dur *= 2; /* ACK + SIFS */ 171 /* next fragment */ 172 dur += ieee80211_frame_duration(sband->band, next_frag_len, 173 txrate->bitrate, erp, 174 tx->sdata->vif.bss_conf.use_short_preamble); 175 } 176 177 return cpu_to_le16(dur); 178 } 179 180 /* tx handlers */ 181 static ieee80211_tx_result debug_noinline 182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 183 { 184 struct ieee80211_local *local = tx->local; 185 struct ieee80211_if_managed *ifmgd; 186 187 /* driver doesn't support power save */ 188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 189 return TX_CONTINUE; 190 191 /* hardware does dynamic power save */ 192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 193 return TX_CONTINUE; 194 195 /* dynamic power save disabled */ 196 if (local->hw.conf.dynamic_ps_timeout <= 0) 197 return TX_CONTINUE; 198 199 /* we are scanning, don't enable power save */ 200 if (local->scanning) 201 return TX_CONTINUE; 202 203 if (!local->ps_sdata) 204 return TX_CONTINUE; 205 206 /* No point if we're going to suspend */ 207 if (local->quiescing) 208 return TX_CONTINUE; 209 210 /* dynamic ps is supported only in managed mode */ 211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 212 return TX_CONTINUE; 213 214 ifmgd = &tx->sdata->u.mgd; 215 216 /* 217 * Don't wakeup from power save if u-apsd is enabled, voip ac has 218 * u-apsd enabled and the frame is in voip class. This effectively 219 * means that even if all access categories have u-apsd enabled, in 220 * practise u-apsd is only used with the voip ac. This is a 221 * workaround for the case when received voip class packets do not 222 * have correct qos tag for some reason, due the network or the 223 * peer application. 224 * 225 * Note: ifmgd->uapsd_queues access is racy here. If the value is 226 * changed via debugfs, user needs to reassociate manually to have 227 * everything in sync. 228 */ 229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 232 return TX_CONTINUE; 233 234 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 235 ieee80211_stop_queues_by_reason(&local->hw, 236 IEEE80211_QUEUE_STOP_REASON_PS); 237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 238 ieee80211_queue_work(&local->hw, 239 &local->dynamic_ps_disable_work); 240 } 241 242 /* Don't restart the timer if we're not disassociated */ 243 if (!ifmgd->associated) 244 return TX_CONTINUE; 245 246 mod_timer(&local->dynamic_ps_timer, jiffies + 247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 248 249 return TX_CONTINUE; 250 } 251 252 static ieee80211_tx_result debug_noinline 253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 254 { 255 256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 258 bool assoc = false; 259 260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 261 return TX_CONTINUE; 262 263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 265 !ieee80211_is_probe_req(hdr->frame_control) && 266 !ieee80211_is_nullfunc(hdr->frame_control)) 267 /* 268 * When software scanning only nullfunc frames (to notify 269 * the sleep state to the AP) and probe requests (for the 270 * active scan) are allowed, all other frames should not be 271 * sent and we should not get here, but if we do 272 * nonetheless, drop them to avoid sending them 273 * off-channel. See the link below and 274 * ieee80211_start_scan() for more. 275 * 276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 277 */ 278 return TX_DROP; 279 280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 281 return TX_CONTINUE; 282 283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 284 return TX_CONTINUE; 285 286 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 287 return TX_CONTINUE; 288 289 if (tx->sta) 290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 291 292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 293 if (unlikely(!assoc && 294 ieee80211_is_data(hdr->frame_control))) { 295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 296 sdata_info(tx->sdata, 297 "dropped data frame to not associated station %pM\n", 298 hdr->addr1); 299 #endif 300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 301 return TX_DROP; 302 } 303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 304 ieee80211_is_data(hdr->frame_control) && 305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 306 /* 307 * No associated STAs - no need to send multicast 308 * frames. 309 */ 310 return TX_DROP; 311 } 312 313 return TX_CONTINUE; 314 } 315 316 /* This function is called whenever the AP is about to exceed the maximum limit 317 * of buffered frames for power saving STAs. This situation should not really 318 * happen often during normal operation, so dropping the oldest buffered packet 319 * from each queue should be OK to make some room for new frames. */ 320 static void purge_old_ps_buffers(struct ieee80211_local *local) 321 { 322 int total = 0, purged = 0; 323 struct sk_buff *skb; 324 struct ieee80211_sub_if_data *sdata; 325 struct sta_info *sta; 326 327 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 328 struct ps_data *ps; 329 330 if (sdata->vif.type == NL80211_IFTYPE_AP) 331 ps = &sdata->u.ap.ps; 332 else 333 continue; 334 335 skb = skb_dequeue(&ps->bc_buf); 336 if (skb) { 337 purged++; 338 dev_kfree_skb(skb); 339 } 340 total += skb_queue_len(&ps->bc_buf); 341 } 342 343 /* 344 * Drop one frame from each station from the lowest-priority 345 * AC that has frames at all. 346 */ 347 list_for_each_entry_rcu(sta, &local->sta_list, list) { 348 int ac; 349 350 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 351 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 352 total += skb_queue_len(&sta->ps_tx_buf[ac]); 353 if (skb) { 354 purged++; 355 ieee80211_free_txskb(&local->hw, skb); 356 break; 357 } 358 } 359 } 360 361 local->total_ps_buffered = total; 362 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 363 } 364 365 static ieee80211_tx_result 366 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 367 { 368 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 369 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 370 struct ps_data *ps; 371 372 /* 373 * broadcast/multicast frame 374 * 375 * If any of the associated stations is in power save mode, 376 * the frame is buffered to be sent after DTIM beacon frame. 377 * This is done either by the hardware or us. 378 */ 379 380 /* powersaving STAs currently only in AP/VLAN mode */ 381 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 382 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 383 if (!tx->sdata->bss) 384 return TX_CONTINUE; 385 386 ps = &tx->sdata->bss->ps; 387 } else { 388 return TX_CONTINUE; 389 } 390 391 392 /* no buffering for ordered frames */ 393 if (ieee80211_has_order(hdr->frame_control)) 394 return TX_CONTINUE; 395 396 /* no stations in PS mode */ 397 if (!atomic_read(&ps->num_sta_ps)) 398 return TX_CONTINUE; 399 400 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 401 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 402 info->hw_queue = tx->sdata->vif.cab_queue; 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(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 413 ps_dbg(tx->sdata, 414 "BC TX buffer full - dropping the oldest frame\n"); 415 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 416 } else 417 tx->local->total_ps_buffered++; 418 419 skb_queue_tail(&ps->bc_buf, tx->skb); 420 421 return TX_QUEUED; 422 } 423 424 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 425 struct sk_buff *skb) 426 { 427 if (!ieee80211_is_mgmt(fc)) 428 return 0; 429 430 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 431 return 0; 432 433 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) 434 skb->data)) 435 return 0; 436 437 return 1; 438 } 439 440 static ieee80211_tx_result 441 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 442 { 443 struct sta_info *sta = tx->sta; 444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 445 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 446 struct ieee80211_local *local = tx->local; 447 448 if (unlikely(!sta)) 449 return TX_CONTINUE; 450 451 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 452 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && 453 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 454 int ac = skb_get_queue_mapping(tx->skb); 455 456 /* only deauth, disassoc and action are bufferable MMPDUs */ 457 if (ieee80211_is_mgmt(hdr->frame_control) && 458 !ieee80211_is_deauth(hdr->frame_control) && 459 !ieee80211_is_disassoc(hdr->frame_control) && 460 !ieee80211_is_action(hdr->frame_control)) { 461 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 462 return TX_CONTINUE; 463 } 464 465 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 466 sta->sta.addr, sta->sta.aid, ac); 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 ps_dbg(tx->sdata, 472 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 473 sta->sta.addr, ac); 474 ieee80211_free_txskb(&local->hw, old); 475 } else 476 tx->local->total_ps_buffered++; 477 478 info->control.jiffies = jiffies; 479 info->control.vif = &tx->sdata->vif; 480 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 481 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 482 483 if (!timer_pending(&local->sta_cleanup)) 484 mod_timer(&local->sta_cleanup, 485 round_jiffies(jiffies + 486 STA_INFO_CLEANUP_INTERVAL)); 487 488 /* 489 * We queued up some frames, so the TIM bit might 490 * need to be set, recalculate it. 491 */ 492 sta_info_recalc_tim(sta); 493 494 return TX_QUEUED; 495 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 496 ps_dbg(tx->sdata, 497 "STA %pM in PS mode, but polling/in SP -> send frame\n", 498 sta->sta.addr); 499 } 500 501 return TX_CONTINUE; 502 } 503 504 static ieee80211_tx_result debug_noinline 505 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 506 { 507 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 508 return TX_CONTINUE; 509 510 if (tx->flags & IEEE80211_TX_UNICAST) 511 return ieee80211_tx_h_unicast_ps_buf(tx); 512 else 513 return ieee80211_tx_h_multicast_ps_buf(tx); 514 } 515 516 static ieee80211_tx_result debug_noinline 517 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 518 { 519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 520 521 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol && 522 tx->sdata->control_port_no_encrypt)) 523 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 524 525 return TX_CONTINUE; 526 } 527 528 static ieee80211_tx_result debug_noinline 529 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 530 { 531 struct ieee80211_key *key; 532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 534 535 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 536 tx->key = NULL; 537 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) 538 tx->key = key; 539 else if (ieee80211_is_mgmt(hdr->frame_control) && 540 is_multicast_ether_addr(hdr->addr1) && 541 ieee80211_is_robust_mgmt_frame(hdr) && 542 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 543 tx->key = key; 544 else if (is_multicast_ether_addr(hdr->addr1) && 545 (key = rcu_dereference(tx->sdata->default_multicast_key))) 546 tx->key = key; 547 else if (!is_multicast_ether_addr(hdr->addr1) && 548 (key = rcu_dereference(tx->sdata->default_unicast_key))) 549 tx->key = key; 550 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 551 tx->key = NULL; 552 else if (!tx->sdata->drop_unencrypted) 553 tx->key = NULL; 554 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 555 tx->key = NULL; 556 else if (ieee80211_is_robust_mgmt_frame(hdr) && 557 !(ieee80211_is_action(hdr->frame_control) && 558 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 559 tx->key = NULL; 560 else if (ieee80211_is_mgmt(hdr->frame_control) && 561 !ieee80211_is_robust_mgmt_frame(hdr)) 562 tx->key = NULL; 563 else { 564 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 565 return TX_DROP; 566 } 567 568 if (tx->key) { 569 bool skip_hw = false; 570 571 tx->key->tx_rx_count++; 572 /* TODO: add threshold stuff again */ 573 574 switch (tx->key->conf.cipher) { 575 case WLAN_CIPHER_SUITE_WEP40: 576 case WLAN_CIPHER_SUITE_WEP104: 577 case WLAN_CIPHER_SUITE_TKIP: 578 if (!ieee80211_is_data_present(hdr->frame_control)) 579 tx->key = NULL; 580 break; 581 case WLAN_CIPHER_SUITE_CCMP: 582 if (!ieee80211_is_data_present(hdr->frame_control) && 583 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 584 tx->skb)) 585 tx->key = NULL; 586 else 587 skip_hw = (tx->key->conf.flags & 588 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 589 ieee80211_is_mgmt(hdr->frame_control); 590 break; 591 case WLAN_CIPHER_SUITE_AES_CMAC: 592 if (!ieee80211_is_mgmt(hdr->frame_control)) 593 tx->key = NULL; 594 break; 595 } 596 597 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED)) 598 return TX_DROP; 599 600 if (!skip_hw && tx->key && 601 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 602 info->control.hw_key = &tx->key->conf; 603 } 604 605 return TX_CONTINUE; 606 } 607 608 static ieee80211_tx_result debug_noinline 609 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 610 { 611 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 612 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 613 struct ieee80211_supported_band *sband; 614 struct ieee80211_rate *rate; 615 int i; 616 u32 len; 617 bool inval = false, rts = false, short_preamble = false; 618 struct ieee80211_tx_rate_control txrc; 619 bool assoc = false; 620 621 memset(&txrc, 0, sizeof(txrc)); 622 623 sband = tx->local->hw.wiphy->bands[info->band]; 624 625 len = min_t(u32, tx->skb->len + FCS_LEN, 626 tx->local->hw.wiphy->frag_threshold); 627 628 /* set up the tx rate control struct we give the RC algo */ 629 txrc.hw = &tx->local->hw; 630 txrc.sband = sband; 631 txrc.bss_conf = &tx->sdata->vif.bss_conf; 632 txrc.skb = tx->skb; 633 txrc.reported_rate.idx = -1; 634 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 635 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 636 txrc.max_rate_idx = -1; 637 else 638 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 639 memcpy(txrc.rate_idx_mcs_mask, 640 tx->sdata->rc_rateidx_mcs_mask[info->band], 641 sizeof(txrc.rate_idx_mcs_mask)); 642 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 643 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 644 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 645 646 /* set up RTS protection if desired */ 647 if (len > tx->local->hw.wiphy->rts_threshold) { 648 txrc.rts = rts = true; 649 } 650 651 /* 652 * Use short preamble if the BSS can handle it, but not for 653 * management frames unless we know the receiver can handle 654 * that -- the management frame might be to a station that 655 * just wants a probe response. 656 */ 657 if (tx->sdata->vif.bss_conf.use_short_preamble && 658 (ieee80211_is_data(hdr->frame_control) || 659 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 660 txrc.short_preamble = short_preamble = true; 661 662 if (tx->sta) 663 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 664 665 /* 666 * Lets not bother rate control if we're associated and cannot 667 * talk to the sta. This should not happen. 668 */ 669 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 670 !rate_usable_index_exists(sband, &tx->sta->sta), 671 "%s: Dropped data frame as no usable bitrate found while " 672 "scanning and associated. Target station: " 673 "%pM on %d GHz band\n", 674 tx->sdata->name, hdr->addr1, 675 info->band ? 5 : 2)) 676 return TX_DROP; 677 678 /* 679 * If we're associated with the sta at this point we know we can at 680 * least send the frame at the lowest bit rate. 681 */ 682 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 683 684 if (unlikely(info->control.rates[0].idx < 0)) 685 return TX_DROP; 686 687 if (txrc.reported_rate.idx < 0) { 688 txrc.reported_rate = info->control.rates[0]; 689 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 690 tx->sta->last_tx_rate = txrc.reported_rate; 691 } else if (tx->sta) 692 tx->sta->last_tx_rate = txrc.reported_rate; 693 694 if (unlikely(!info->control.rates[0].count)) 695 info->control.rates[0].count = 1; 696 697 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 698 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 699 info->control.rates[0].count = 1; 700 701 if (is_multicast_ether_addr(hdr->addr1)) { 702 /* 703 * XXX: verify the rate is in the basic rateset 704 */ 705 return TX_CONTINUE; 706 } 707 708 /* 709 * set up the RTS/CTS rate as the fastest basic rate 710 * that is not faster than the data rate 711 * 712 * XXX: Should this check all retry rates? 713 */ 714 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) { 715 s8 baserate = 0; 716 717 rate = &sband->bitrates[info->control.rates[0].idx]; 718 719 for (i = 0; i < sband->n_bitrates; i++) { 720 /* must be a basic rate */ 721 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i))) 722 continue; 723 /* must not be faster than the data rate */ 724 if (sband->bitrates[i].bitrate > rate->bitrate) 725 continue; 726 /* maximum */ 727 if (sband->bitrates[baserate].bitrate < 728 sband->bitrates[i].bitrate) 729 baserate = i; 730 } 731 732 info->control.rts_cts_rate_idx = baserate; 733 } 734 735 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 736 /* 737 * make sure there's no valid rate following 738 * an invalid one, just in case drivers don't 739 * take the API seriously to stop at -1. 740 */ 741 if (inval) { 742 info->control.rates[i].idx = -1; 743 continue; 744 } 745 if (info->control.rates[i].idx < 0) { 746 inval = true; 747 continue; 748 } 749 750 /* 751 * For now assume MCS is already set up correctly, this 752 * needs to be fixed. 753 */ 754 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) { 755 WARN_ON(info->control.rates[i].idx > 76); 756 continue; 757 } 758 759 /* set up RTS protection if desired */ 760 if (rts) 761 info->control.rates[i].flags |= 762 IEEE80211_TX_RC_USE_RTS_CTS; 763 764 /* RC is busted */ 765 if (WARN_ON_ONCE(info->control.rates[i].idx >= 766 sband->n_bitrates)) { 767 info->control.rates[i].idx = -1; 768 continue; 769 } 770 771 rate = &sband->bitrates[info->control.rates[i].idx]; 772 773 /* set up short preamble */ 774 if (short_preamble && 775 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 776 info->control.rates[i].flags |= 777 IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 778 779 /* set up G protection */ 780 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot && 781 rate->flags & IEEE80211_RATE_ERP_G) 782 info->control.rates[i].flags |= 783 IEEE80211_TX_RC_USE_CTS_PROTECT; 784 } 785 786 return TX_CONTINUE; 787 } 788 789 static ieee80211_tx_result debug_noinline 790 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 791 { 792 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 794 u16 *seq; 795 u8 *qc; 796 int tid; 797 798 /* 799 * Packet injection may want to control the sequence 800 * number, if we have no matching interface then we 801 * neither assign one ourselves nor ask the driver to. 802 */ 803 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 804 return TX_CONTINUE; 805 806 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 807 return TX_CONTINUE; 808 809 if (ieee80211_hdrlen(hdr->frame_control) < 24) 810 return TX_CONTINUE; 811 812 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 813 return TX_CONTINUE; 814 815 /* 816 * Anything but QoS data that has a sequence number field 817 * (is long enough) gets a sequence number from the global 818 * counter. 819 */ 820 if (!ieee80211_is_data_qos(hdr->frame_control)) { 821 /* driver should assign sequence number */ 822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 823 /* for pure STA mode without beacons, we can do it */ 824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 825 tx->sdata->sequence_number += 0x10; 826 return TX_CONTINUE; 827 } 828 829 /* 830 * This should be true for injected/management frames only, for 831 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 832 * above since they are not QoS-data frames. 833 */ 834 if (!tx->sta) 835 return TX_CONTINUE; 836 837 /* include per-STA, per-TID sequence counter */ 838 839 qc = ieee80211_get_qos_ctl(hdr); 840 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 841 seq = &tx->sta->tid_seq[tid]; 842 843 hdr->seq_ctrl = cpu_to_le16(*seq); 844 845 /* Increase the sequence number. */ 846 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 847 848 return TX_CONTINUE; 849 } 850 851 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 852 struct sk_buff *skb, int hdrlen, 853 int frag_threshold) 854 { 855 struct ieee80211_local *local = tx->local; 856 struct ieee80211_tx_info *info; 857 struct sk_buff *tmp; 858 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 859 int pos = hdrlen + per_fragm; 860 int rem = skb->len - hdrlen - per_fragm; 861 862 if (WARN_ON(rem < 0)) 863 return -EINVAL; 864 865 /* first fragment was already added to queue by caller */ 866 867 while (rem) { 868 int fraglen = per_fragm; 869 870 if (fraglen > rem) 871 fraglen = rem; 872 rem -= fraglen; 873 tmp = dev_alloc_skb(local->tx_headroom + 874 frag_threshold + 875 IEEE80211_ENCRYPT_HEADROOM + 876 IEEE80211_ENCRYPT_TAILROOM); 877 if (!tmp) 878 return -ENOMEM; 879 880 __skb_queue_tail(&tx->skbs, tmp); 881 882 skb_reserve(tmp, local->tx_headroom + 883 IEEE80211_ENCRYPT_HEADROOM); 884 /* copy control information */ 885 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 886 887 info = IEEE80211_SKB_CB(tmp); 888 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 889 IEEE80211_TX_CTL_FIRST_FRAGMENT); 890 891 if (rem) 892 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 893 894 skb_copy_queue_mapping(tmp, skb); 895 tmp->priority = skb->priority; 896 tmp->dev = skb->dev; 897 898 /* copy header and data */ 899 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 900 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 901 902 pos += fraglen; 903 } 904 905 /* adjust first fragment's length */ 906 skb->len = hdrlen + per_fragm; 907 return 0; 908 } 909 910 static ieee80211_tx_result debug_noinline 911 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 912 { 913 struct sk_buff *skb = tx->skb; 914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 915 struct ieee80211_hdr *hdr = (void *)skb->data; 916 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 917 int hdrlen; 918 int fragnum; 919 920 /* no matter what happens, tx->skb moves to tx->skbs */ 921 __skb_queue_tail(&tx->skbs, skb); 922 tx->skb = NULL; 923 924 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 925 return TX_CONTINUE; 926 927 if (tx->local->ops->set_frag_threshold) 928 return TX_CONTINUE; 929 930 /* 931 * Warn when submitting a fragmented A-MPDU frame and drop it. 932 * This scenario is handled in ieee80211_tx_prepare but extra 933 * caution taken here as fragmented ampdu may cause Tx stop. 934 */ 935 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 936 return TX_DROP; 937 938 hdrlen = ieee80211_hdrlen(hdr->frame_control); 939 940 /* internal error, why isn't DONTFRAG set? */ 941 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 942 return TX_DROP; 943 944 /* 945 * Now fragment the frame. This will allocate all the fragments and 946 * chain them (using skb as the first fragment) to skb->next. 947 * During transmission, we will remove the successfully transmitted 948 * fragments from this list. When the low-level driver rejects one 949 * of the fragments then we will simply pretend to accept the skb 950 * but store it away as pending. 951 */ 952 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 953 return TX_DROP; 954 955 /* update duration/seq/flags of fragments */ 956 fragnum = 0; 957 958 skb_queue_walk(&tx->skbs, skb) { 959 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 960 961 hdr = (void *)skb->data; 962 info = IEEE80211_SKB_CB(skb); 963 964 if (!skb_queue_is_last(&tx->skbs, skb)) { 965 hdr->frame_control |= morefrags; 966 /* 967 * No multi-rate retries for fragmented frames, that 968 * would completely throw off the NAV at other STAs. 969 */ 970 info->control.rates[1].idx = -1; 971 info->control.rates[2].idx = -1; 972 info->control.rates[3].idx = -1; 973 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 974 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 975 } else { 976 hdr->frame_control &= ~morefrags; 977 } 978 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 979 fragnum++; 980 } 981 982 return TX_CONTINUE; 983 } 984 985 static ieee80211_tx_result debug_noinline 986 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 987 { 988 struct sk_buff *skb; 989 990 if (!tx->sta) 991 return TX_CONTINUE; 992 993 tx->sta->tx_packets++; 994 skb_queue_walk(&tx->skbs, skb) { 995 tx->sta->tx_fragments++; 996 tx->sta->tx_bytes += skb->len; 997 } 998 999 return TX_CONTINUE; 1000 } 1001 1002 static ieee80211_tx_result debug_noinline 1003 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1004 { 1005 if (!tx->key) 1006 return TX_CONTINUE; 1007 1008 switch (tx->key->conf.cipher) { 1009 case WLAN_CIPHER_SUITE_WEP40: 1010 case WLAN_CIPHER_SUITE_WEP104: 1011 return ieee80211_crypto_wep_encrypt(tx); 1012 case WLAN_CIPHER_SUITE_TKIP: 1013 return ieee80211_crypto_tkip_encrypt(tx); 1014 case WLAN_CIPHER_SUITE_CCMP: 1015 return ieee80211_crypto_ccmp_encrypt(tx); 1016 case WLAN_CIPHER_SUITE_AES_CMAC: 1017 return ieee80211_crypto_aes_cmac_encrypt(tx); 1018 default: 1019 return ieee80211_crypto_hw_encrypt(tx); 1020 } 1021 1022 return TX_DROP; 1023 } 1024 1025 static ieee80211_tx_result debug_noinline 1026 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1027 { 1028 struct sk_buff *skb; 1029 struct ieee80211_hdr *hdr; 1030 int next_len; 1031 bool group_addr; 1032 1033 skb_queue_walk(&tx->skbs, skb) { 1034 hdr = (void *) skb->data; 1035 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1036 break; /* must not overwrite AID */ 1037 if (!skb_queue_is_last(&tx->skbs, skb)) { 1038 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1039 next_len = next->len; 1040 } else 1041 next_len = 0; 1042 group_addr = is_multicast_ether_addr(hdr->addr1); 1043 1044 hdr->duration_id = 1045 ieee80211_duration(tx, skb, group_addr, next_len); 1046 } 1047 1048 return TX_CONTINUE; 1049 } 1050 1051 /* actual transmit path */ 1052 1053 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1054 struct sk_buff *skb, 1055 struct ieee80211_tx_info *info, 1056 struct tid_ampdu_tx *tid_tx, 1057 int tid) 1058 { 1059 bool queued = false; 1060 bool reset_agg_timer = false; 1061 struct sk_buff *purge_skb = NULL; 1062 1063 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1064 info->flags |= IEEE80211_TX_CTL_AMPDU; 1065 reset_agg_timer = true; 1066 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1067 /* 1068 * nothing -- this aggregation session is being started 1069 * but that might still fail with the driver 1070 */ 1071 } else { 1072 spin_lock(&tx->sta->lock); 1073 /* 1074 * Need to re-check now, because we may get here 1075 * 1076 * 1) in the window during which the setup is actually 1077 * already done, but not marked yet because not all 1078 * packets are spliced over to the driver pending 1079 * queue yet -- if this happened we acquire the lock 1080 * either before or after the splice happens, but 1081 * need to recheck which of these cases happened. 1082 * 1083 * 2) during session teardown, if the OPERATIONAL bit 1084 * was cleared due to the teardown but the pointer 1085 * hasn't been assigned NULL yet (or we loaded it 1086 * before it was assigned) -- in this case it may 1087 * now be NULL which means we should just let the 1088 * packet pass through because splicing the frames 1089 * back is already done. 1090 */ 1091 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1092 1093 if (!tid_tx) { 1094 /* do nothing, let packet pass through */ 1095 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1096 info->flags |= IEEE80211_TX_CTL_AMPDU; 1097 reset_agg_timer = true; 1098 } else { 1099 queued = true; 1100 info->control.vif = &tx->sdata->vif; 1101 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1102 __skb_queue_tail(&tid_tx->pending, skb); 1103 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1104 purge_skb = __skb_dequeue(&tid_tx->pending); 1105 } 1106 spin_unlock(&tx->sta->lock); 1107 1108 if (purge_skb) 1109 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1110 } 1111 1112 /* reset session timer */ 1113 if (reset_agg_timer && tid_tx->timeout) 1114 tid_tx->last_tx = jiffies; 1115 1116 return queued; 1117 } 1118 1119 /* 1120 * initialises @tx 1121 */ 1122 static ieee80211_tx_result 1123 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1124 struct ieee80211_tx_data *tx, 1125 struct sk_buff *skb) 1126 { 1127 struct ieee80211_local *local = sdata->local; 1128 struct ieee80211_hdr *hdr; 1129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1130 int tid; 1131 u8 *qc; 1132 1133 memset(tx, 0, sizeof(*tx)); 1134 tx->skb = skb; 1135 tx->local = local; 1136 tx->sdata = sdata; 1137 __skb_queue_head_init(&tx->skbs); 1138 1139 /* 1140 * If this flag is set to true anywhere, and we get here, 1141 * we are doing the needed processing, so remove the flag 1142 * now. 1143 */ 1144 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1145 1146 hdr = (struct ieee80211_hdr *) skb->data; 1147 1148 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1149 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1150 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1151 return TX_DROP; 1152 } else if (info->flags & IEEE80211_TX_CTL_INJECTED || 1153 tx->sdata->control_port_protocol == tx->skb->protocol) { 1154 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1155 } 1156 if (!tx->sta) 1157 tx->sta = sta_info_get(sdata, hdr->addr1); 1158 1159 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1160 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1161 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1162 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1163 struct tid_ampdu_tx *tid_tx; 1164 1165 qc = ieee80211_get_qos_ctl(hdr); 1166 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1167 1168 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1169 if (tid_tx) { 1170 bool queued; 1171 1172 queued = ieee80211_tx_prep_agg(tx, skb, info, 1173 tid_tx, tid); 1174 1175 if (unlikely(queued)) 1176 return TX_QUEUED; 1177 } 1178 } 1179 1180 if (is_multicast_ether_addr(hdr->addr1)) { 1181 tx->flags &= ~IEEE80211_TX_UNICAST; 1182 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1183 } else 1184 tx->flags |= IEEE80211_TX_UNICAST; 1185 1186 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1187 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1188 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1189 info->flags & IEEE80211_TX_CTL_AMPDU) 1190 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1191 } 1192 1193 if (!tx->sta) 1194 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1195 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1196 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1197 1198 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1199 1200 return TX_CONTINUE; 1201 } 1202 1203 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1204 struct ieee80211_vif *vif, 1205 struct ieee80211_sta *sta, 1206 struct sk_buff_head *skbs, 1207 bool txpending) 1208 { 1209 struct ieee80211_tx_control control; 1210 struct sk_buff *skb, *tmp; 1211 unsigned long flags; 1212 1213 skb_queue_walk_safe(skbs, skb, tmp) { 1214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1215 int q = info->hw_queue; 1216 1217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1218 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1219 __skb_unlink(skb, skbs); 1220 ieee80211_free_txskb(&local->hw, skb); 1221 continue; 1222 } 1223 #endif 1224 1225 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1226 if (local->queue_stop_reasons[q] || 1227 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1228 /* 1229 * Since queue is stopped, queue up frames for later 1230 * transmission from the tx-pending tasklet when the 1231 * queue is woken again. 1232 */ 1233 if (txpending) 1234 skb_queue_splice_init(skbs, &local->pending[q]); 1235 else 1236 skb_queue_splice_tail_init(skbs, 1237 &local->pending[q]); 1238 1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1240 flags); 1241 return false; 1242 } 1243 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1244 1245 info->control.vif = vif; 1246 control.sta = sta; 1247 1248 __skb_unlink(skb, skbs); 1249 drv_tx(local, &control, skb); 1250 } 1251 1252 return true; 1253 } 1254 1255 /* 1256 * Returns false if the frame couldn't be transmitted but was queued instead. 1257 */ 1258 static bool __ieee80211_tx(struct ieee80211_local *local, 1259 struct sk_buff_head *skbs, int led_len, 1260 struct sta_info *sta, bool txpending) 1261 { 1262 struct ieee80211_tx_info *info; 1263 struct ieee80211_sub_if_data *sdata; 1264 struct ieee80211_vif *vif; 1265 struct ieee80211_sta *pubsta; 1266 struct sk_buff *skb; 1267 bool result = true; 1268 __le16 fc; 1269 1270 if (WARN_ON(skb_queue_empty(skbs))) 1271 return true; 1272 1273 skb = skb_peek(skbs); 1274 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1275 info = IEEE80211_SKB_CB(skb); 1276 sdata = vif_to_sdata(info->control.vif); 1277 if (sta && !sta->uploaded) 1278 sta = NULL; 1279 1280 if (sta) 1281 pubsta = &sta->sta; 1282 else 1283 pubsta = NULL; 1284 1285 switch (sdata->vif.type) { 1286 case NL80211_IFTYPE_MONITOR: 1287 sdata = rcu_dereference(local->monitor_sdata); 1288 if (sdata) { 1289 vif = &sdata->vif; 1290 info->hw_queue = 1291 vif->hw_queue[skb_get_queue_mapping(skb)]; 1292 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1293 dev_kfree_skb(skb); 1294 return true; 1295 } else 1296 vif = NULL; 1297 break; 1298 case NL80211_IFTYPE_AP_VLAN: 1299 sdata = container_of(sdata->bss, 1300 struct ieee80211_sub_if_data, u.ap); 1301 /* fall through */ 1302 default: 1303 vif = &sdata->vif; 1304 break; 1305 } 1306 1307 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1308 txpending); 1309 1310 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1311 ieee80211_led_tx(local, 1); 1312 1313 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1314 1315 return result; 1316 } 1317 1318 /* 1319 * Invoke TX handlers, return 0 on success and non-zero if the 1320 * frame was dropped or queued. 1321 */ 1322 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1323 { 1324 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1325 ieee80211_tx_result res = TX_DROP; 1326 1327 #define CALL_TXH(txh) \ 1328 do { \ 1329 res = txh(tx); \ 1330 if (res != TX_CONTINUE) \ 1331 goto txh_done; \ 1332 } while (0) 1333 1334 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1335 CALL_TXH(ieee80211_tx_h_check_assoc); 1336 CALL_TXH(ieee80211_tx_h_ps_buf); 1337 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1338 CALL_TXH(ieee80211_tx_h_select_key); 1339 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1340 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1341 1342 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1343 __skb_queue_tail(&tx->skbs, tx->skb); 1344 tx->skb = NULL; 1345 goto txh_done; 1346 } 1347 1348 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1349 CALL_TXH(ieee80211_tx_h_sequence); 1350 CALL_TXH(ieee80211_tx_h_fragment); 1351 /* handlers after fragment must be aware of tx info fragmentation! */ 1352 CALL_TXH(ieee80211_tx_h_stats); 1353 CALL_TXH(ieee80211_tx_h_encrypt); 1354 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1355 CALL_TXH(ieee80211_tx_h_calculate_duration); 1356 #undef CALL_TXH 1357 1358 txh_done: 1359 if (unlikely(res == TX_DROP)) { 1360 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1361 if (tx->skb) 1362 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1363 else 1364 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1365 return -1; 1366 } else if (unlikely(res == TX_QUEUED)) { 1367 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1368 return -1; 1369 } 1370 1371 return 0; 1372 } 1373 1374 /* 1375 * Returns false if the frame couldn't be transmitted but was queued instead. 1376 */ 1377 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1378 struct sk_buff *skb, bool txpending, 1379 enum ieee80211_band band) 1380 { 1381 struct ieee80211_local *local = sdata->local; 1382 struct ieee80211_tx_data tx; 1383 ieee80211_tx_result res_prepare; 1384 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1385 bool result = true; 1386 int led_len; 1387 1388 if (unlikely(skb->len < 10)) { 1389 dev_kfree_skb(skb); 1390 return true; 1391 } 1392 1393 /* initialises tx */ 1394 led_len = skb->len; 1395 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1396 1397 if (unlikely(res_prepare == TX_DROP)) { 1398 ieee80211_free_txskb(&local->hw, skb); 1399 return true; 1400 } else if (unlikely(res_prepare == TX_QUEUED)) { 1401 return true; 1402 } 1403 1404 info->band = band; 1405 1406 /* set up hw_queue value early */ 1407 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1408 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1409 info->hw_queue = 1410 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1411 1412 if (!invoke_tx_handlers(&tx)) 1413 result = __ieee80211_tx(local, &tx.skbs, led_len, 1414 tx.sta, txpending); 1415 1416 return result; 1417 } 1418 1419 /* device xmit handlers */ 1420 1421 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1422 struct sk_buff *skb, 1423 int head_need, bool may_encrypt) 1424 { 1425 struct ieee80211_local *local = sdata->local; 1426 int tail_need = 0; 1427 1428 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1429 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1430 tail_need -= skb_tailroom(skb); 1431 tail_need = max_t(int, tail_need, 0); 1432 } 1433 1434 if (skb_cloned(skb)) 1435 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1436 else if (head_need || tail_need) 1437 I802_DEBUG_INC(local->tx_expand_skb_head); 1438 else 1439 return 0; 1440 1441 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1442 wiphy_debug(local->hw.wiphy, 1443 "failed to reallocate TX buffer\n"); 1444 return -ENOMEM; 1445 } 1446 1447 return 0; 1448 } 1449 1450 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1451 enum ieee80211_band band) 1452 { 1453 struct ieee80211_local *local = sdata->local; 1454 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1455 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1456 int headroom; 1457 bool may_encrypt; 1458 1459 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1460 1461 headroom = local->tx_headroom; 1462 if (may_encrypt) 1463 headroom += IEEE80211_ENCRYPT_HEADROOM; 1464 headroom -= skb_headroom(skb); 1465 headroom = max_t(int, 0, headroom); 1466 1467 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1468 ieee80211_free_txskb(&local->hw, skb); 1469 return; 1470 } 1471 1472 hdr = (struct ieee80211_hdr *) skb->data; 1473 info->control.vif = &sdata->vif; 1474 1475 if (ieee80211_vif_is_mesh(&sdata->vif) && 1476 ieee80211_is_data(hdr->frame_control) && 1477 !is_multicast_ether_addr(hdr->addr1) && 1478 mesh_nexthop_resolve(skb, sdata)) { 1479 /* skb queued: don't free */ 1480 return; 1481 } 1482 1483 ieee80211_set_qos_hdr(sdata, skb); 1484 ieee80211_tx(sdata, skb, false, band); 1485 } 1486 1487 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1488 { 1489 struct ieee80211_radiotap_iterator iterator; 1490 struct ieee80211_radiotap_header *rthdr = 1491 (struct ieee80211_radiotap_header *) skb->data; 1492 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1493 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1494 NULL); 1495 u16 txflags; 1496 1497 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1498 IEEE80211_TX_CTL_DONTFRAG; 1499 1500 /* 1501 * for every radiotap entry that is present 1502 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1503 * entries present, or -EINVAL on error) 1504 */ 1505 1506 while (!ret) { 1507 ret = ieee80211_radiotap_iterator_next(&iterator); 1508 1509 if (ret) 1510 continue; 1511 1512 /* see if this argument is something we can use */ 1513 switch (iterator.this_arg_index) { 1514 /* 1515 * You must take care when dereferencing iterator.this_arg 1516 * for multibyte types... the pointer is not aligned. Use 1517 * get_unaligned((type *)iterator.this_arg) to dereference 1518 * iterator.this_arg for type "type" safely on all arches. 1519 */ 1520 case IEEE80211_RADIOTAP_FLAGS: 1521 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1522 /* 1523 * this indicates that the skb we have been 1524 * handed has the 32-bit FCS CRC at the end... 1525 * we should react to that by snipping it off 1526 * because it will be recomputed and added 1527 * on transmission 1528 */ 1529 if (skb->len < (iterator._max_length + FCS_LEN)) 1530 return false; 1531 1532 skb_trim(skb, skb->len - FCS_LEN); 1533 } 1534 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1535 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1536 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1537 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1538 break; 1539 1540 case IEEE80211_RADIOTAP_TX_FLAGS: 1541 txflags = get_unaligned_le16(iterator.this_arg); 1542 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1543 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1544 break; 1545 1546 /* 1547 * Please update the file 1548 * Documentation/networking/mac80211-injection.txt 1549 * when parsing new fields here. 1550 */ 1551 1552 default: 1553 break; 1554 } 1555 } 1556 1557 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1558 return false; 1559 1560 /* 1561 * remove the radiotap header 1562 * iterator->_max_length was sanity-checked against 1563 * skb->len by iterator init 1564 */ 1565 skb_pull(skb, iterator._max_length); 1566 1567 return true; 1568 } 1569 1570 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1571 struct net_device *dev) 1572 { 1573 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1574 struct ieee80211_chanctx_conf *chanctx_conf; 1575 struct ieee80211_channel *chan; 1576 struct ieee80211_radiotap_header *prthdr = 1577 (struct ieee80211_radiotap_header *)skb->data; 1578 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1579 struct ieee80211_hdr *hdr; 1580 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1581 u16 len_rthdr; 1582 int hdrlen; 1583 1584 /* check for not even having the fixed radiotap header part */ 1585 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1586 goto fail; /* too short to be possibly valid */ 1587 1588 /* is it a header version we can trust to find length from? */ 1589 if (unlikely(prthdr->it_version)) 1590 goto fail; /* only version 0 is supported */ 1591 1592 /* then there must be a radiotap header with a length we can use */ 1593 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1594 1595 /* does the skb contain enough to deliver on the alleged length? */ 1596 if (unlikely(skb->len < len_rthdr)) 1597 goto fail; /* skb too short for claimed rt header extent */ 1598 1599 /* 1600 * fix up the pointers accounting for the radiotap 1601 * header still being in there. We are being given 1602 * a precooked IEEE80211 header so no need for 1603 * normal processing 1604 */ 1605 skb_set_mac_header(skb, len_rthdr); 1606 /* 1607 * these are just fixed to the end of the rt area since we 1608 * don't have any better information and at this point, nobody cares 1609 */ 1610 skb_set_network_header(skb, len_rthdr); 1611 skb_set_transport_header(skb, len_rthdr); 1612 1613 if (skb->len < len_rthdr + 2) 1614 goto fail; 1615 1616 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1617 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1618 1619 if (skb->len < len_rthdr + hdrlen) 1620 goto fail; 1621 1622 /* 1623 * Initialize skb->protocol if the injected frame is a data frame 1624 * carrying a rfc1042 header 1625 */ 1626 if (ieee80211_is_data(hdr->frame_control) && 1627 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1628 u8 *payload = (u8 *)hdr + hdrlen; 1629 1630 if (ether_addr_equal(payload, rfc1042_header)) 1631 skb->protocol = cpu_to_be16((payload[6] << 8) | 1632 payload[7]); 1633 } 1634 1635 memset(info, 0, sizeof(*info)); 1636 1637 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1638 IEEE80211_TX_CTL_INJECTED; 1639 1640 /* process and remove the injection radiotap header */ 1641 if (!ieee80211_parse_tx_radiotap(skb)) 1642 goto fail; 1643 1644 rcu_read_lock(); 1645 1646 /* 1647 * We process outgoing injected frames that have a local address 1648 * we handle as though they are non-injected frames. 1649 * This code here isn't entirely correct, the local MAC address 1650 * isn't always enough to find the interface to use; for proper 1651 * VLAN/WDS support we will need a different mechanism (which 1652 * likely isn't going to be monitor interfaces). 1653 */ 1654 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1655 1656 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1657 if (!ieee80211_sdata_running(tmp_sdata)) 1658 continue; 1659 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1660 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1661 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1662 continue; 1663 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1664 sdata = tmp_sdata; 1665 break; 1666 } 1667 } 1668 1669 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1670 if (!chanctx_conf) { 1671 tmp_sdata = rcu_dereference(local->monitor_sdata); 1672 if (tmp_sdata) 1673 chanctx_conf = 1674 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1675 } 1676 1677 if (chanctx_conf) 1678 chan = chanctx_conf->def.chan; 1679 else if (!local->use_chanctx) 1680 chan = local->_oper_channel; 1681 else 1682 goto fail_rcu; 1683 1684 /* 1685 * Frame injection is not allowed if beaconing is not allowed 1686 * or if we need radar detection. Beaconing is usually not allowed when 1687 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1688 * Passive scan is also used in world regulatory domains where 1689 * your country is not known and as such it should be treated as 1690 * NO TX unless the channel is explicitly allowed in which case 1691 * your current regulatory domain would not have the passive scan 1692 * flag. 1693 * 1694 * Since AP mode uses monitor interfaces to inject/TX management 1695 * frames we can make AP mode the exception to this rule once it 1696 * supports radar detection as its implementation can deal with 1697 * radar detection by itself. We can do that later by adding a 1698 * monitor flag interfaces used for AP support. 1699 */ 1700 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | 1701 IEEE80211_CHAN_PASSIVE_SCAN))) 1702 goto fail_rcu; 1703 1704 ieee80211_xmit(sdata, skb, chan->band); 1705 rcu_read_unlock(); 1706 1707 return NETDEV_TX_OK; 1708 1709 fail_rcu: 1710 rcu_read_unlock(); 1711 fail: 1712 dev_kfree_skb(skb); 1713 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1714 } 1715 1716 /** 1717 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1718 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1719 * @skb: packet to be sent 1720 * @dev: incoming interface 1721 * 1722 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1723 * not be freed, and caller is responsible for either retrying later or freeing 1724 * skb). 1725 * 1726 * This function takes in an Ethernet header and encapsulates it with suitable 1727 * IEEE 802.11 header based on which interface the packet is coming in. The 1728 * encapsulated packet will then be passed to master interface, wlan#.11, for 1729 * transmission (through low-level driver). 1730 */ 1731 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1732 struct net_device *dev) 1733 { 1734 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1735 struct ieee80211_local *local = sdata->local; 1736 struct ieee80211_tx_info *info; 1737 int head_need; 1738 u16 ethertype, hdrlen, meshhdrlen = 0; 1739 __le16 fc; 1740 struct ieee80211_hdr hdr; 1741 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1742 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1743 const u8 *encaps_data; 1744 int encaps_len, skip_header_bytes; 1745 int nh_pos, h_pos; 1746 struct sta_info *sta = NULL; 1747 bool wme_sta = false, authorized = false, tdls_auth = false; 1748 bool tdls_direct = false; 1749 bool multicast; 1750 u32 info_flags = 0; 1751 u16 info_id = 0; 1752 struct ieee80211_chanctx_conf *chanctx_conf; 1753 struct ieee80211_sub_if_data *ap_sdata; 1754 enum ieee80211_band band; 1755 1756 if (unlikely(skb->len < ETH_HLEN)) 1757 goto fail; 1758 1759 /* convert Ethernet header to proper 802.11 header (based on 1760 * operation mode) */ 1761 ethertype = (skb->data[12] << 8) | skb->data[13]; 1762 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1763 1764 rcu_read_lock(); 1765 1766 switch (sdata->vif.type) { 1767 case NL80211_IFTYPE_AP_VLAN: 1768 sta = rcu_dereference(sdata->u.vlan.sta); 1769 if (sta) { 1770 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1771 /* RA TA DA SA */ 1772 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1773 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1774 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1775 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1776 hdrlen = 30; 1777 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1778 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1779 } 1780 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1781 u.ap); 1782 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1783 if (!chanctx_conf) 1784 goto fail_rcu; 1785 band = chanctx_conf->def.chan->band; 1786 if (sta) 1787 break; 1788 /* fall through */ 1789 case NL80211_IFTYPE_AP: 1790 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1791 /* DA BSSID SA */ 1792 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1793 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1794 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1795 hdrlen = 24; 1796 if (sdata->vif.type == NL80211_IFTYPE_AP) 1797 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1798 if (!chanctx_conf) 1799 goto fail_rcu; 1800 band = chanctx_conf->def.chan->band; 1801 break; 1802 case NL80211_IFTYPE_WDS: 1803 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1804 /* RA TA DA SA */ 1805 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1806 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1807 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1808 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1809 hdrlen = 30; 1810 /* 1811 * This is the exception! WDS style interfaces are prohibited 1812 * when channel contexts are in used so this must be valid 1813 */ 1814 band = local->hw.conf.channel->band; 1815 break; 1816 #ifdef CONFIG_MAC80211_MESH 1817 case NL80211_IFTYPE_MESH_POINT: 1818 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) { 1819 /* Do not send frames with mesh_ttl == 0 */ 1820 sdata->u.mesh.mshstats.dropped_frames_ttl++; 1821 goto fail_rcu; 1822 } 1823 1824 if (!is_multicast_ether_addr(skb->data)) { 1825 mpath = mesh_path_lookup(skb->data, sdata); 1826 if (!mpath) 1827 mppath = mpp_path_lookup(skb->data, sdata); 1828 } 1829 1830 /* 1831 * Use address extension if it is a packet from 1832 * another interface or if we know the destination 1833 * is being proxied by a portal (i.e. portal address 1834 * differs from proxied address) 1835 */ 1836 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1837 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1838 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1839 skb->data, skb->data + ETH_ALEN); 1840 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, 1841 sdata, NULL, NULL); 1842 } else { 1843 /* DS -> MBSS (802.11-2012 13.11.3.3). 1844 * For unicast with unknown forwarding information, 1845 * destination might be in the MBSS or if that fails 1846 * forwarded to another mesh gate. In either case 1847 * resolution will be handled in ieee80211_xmit(), so 1848 * leave the original DA. This also works for mcast */ 1849 const u8 *mesh_da = skb->data; 1850 1851 if (mppath) 1852 mesh_da = mppath->mpp; 1853 else if (mpath) 1854 mesh_da = mpath->dst; 1855 1856 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1857 mesh_da, sdata->vif.addr); 1858 if (is_multicast_ether_addr(mesh_da)) 1859 /* DA TA mSA AE:SA */ 1860 meshhdrlen = 1861 ieee80211_new_mesh_header(&mesh_hdr, 1862 sdata, 1863 skb->data + ETH_ALEN, 1864 NULL); 1865 else 1866 /* RA TA mDA mSA AE:DA SA */ 1867 meshhdrlen = 1868 ieee80211_new_mesh_header(&mesh_hdr, 1869 sdata, 1870 skb->data, 1871 skb->data + ETH_ALEN); 1872 1873 } 1874 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1875 if (!chanctx_conf) 1876 goto fail_rcu; 1877 band = chanctx_conf->def.chan->band; 1878 break; 1879 #endif 1880 case NL80211_IFTYPE_STATION: 1881 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1882 bool tdls_peer = false; 1883 1884 sta = sta_info_get(sdata, skb->data); 1885 if (sta) { 1886 authorized = test_sta_flag(sta, 1887 WLAN_STA_AUTHORIZED); 1888 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1889 tdls_peer = test_sta_flag(sta, 1890 WLAN_STA_TDLS_PEER); 1891 tdls_auth = test_sta_flag(sta, 1892 WLAN_STA_TDLS_PEER_AUTH); 1893 } 1894 1895 /* 1896 * If the TDLS link is enabled, send everything 1897 * directly. Otherwise, allow TDLS setup frames 1898 * to be transmitted indirectly. 1899 */ 1900 tdls_direct = tdls_peer && (tdls_auth || 1901 !(ethertype == ETH_P_TDLS && skb->len > 14 && 1902 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); 1903 } 1904 1905 if (tdls_direct) { 1906 /* link during setup - throw out frames to peer */ 1907 if (!tdls_auth) 1908 goto fail_rcu; 1909 1910 /* DA SA BSSID */ 1911 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1912 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1913 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1914 hdrlen = 24; 1915 } else if (sdata->u.mgd.use_4addr && 1916 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1917 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1918 IEEE80211_FCTL_TODS); 1919 /* RA TA DA SA */ 1920 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1921 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1922 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1923 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1924 hdrlen = 30; 1925 } else { 1926 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 1927 /* BSSID SA DA */ 1928 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1929 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1930 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1931 hdrlen = 24; 1932 } 1933 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1934 if (!chanctx_conf) 1935 goto fail_rcu; 1936 band = chanctx_conf->def.chan->band; 1937 break; 1938 case NL80211_IFTYPE_ADHOC: 1939 /* DA SA BSSID */ 1940 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1941 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1942 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 1943 hdrlen = 24; 1944 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1945 if (!chanctx_conf) 1946 goto fail_rcu; 1947 band = chanctx_conf->def.chan->band; 1948 break; 1949 default: 1950 goto fail_rcu; 1951 } 1952 1953 /* 1954 * There's no need to try to look up the destination 1955 * if it is a multicast address (which can only happen 1956 * in AP mode) 1957 */ 1958 multicast = is_multicast_ether_addr(hdr.addr1); 1959 if (!multicast) { 1960 sta = sta_info_get(sdata, hdr.addr1); 1961 if (sta) { 1962 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1963 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1964 } 1965 } 1966 1967 /* For mesh, the use of the QoS header is mandatory */ 1968 if (ieee80211_vif_is_mesh(&sdata->vif)) 1969 wme_sta = true; 1970 1971 /* receiver and we are QoS enabled, use a QoS type frame */ 1972 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 1973 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 1974 hdrlen += 2; 1975 } 1976 1977 /* 1978 * Drop unicast frames to unauthorised stations unless they are 1979 * EAPOL frames from the local station. 1980 */ 1981 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 1982 !is_multicast_ether_addr(hdr.addr1) && !authorized && 1983 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 1984 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 1985 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1986 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 1987 dev->name, hdr.addr1); 1988 #endif 1989 1990 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1991 1992 goto fail_rcu; 1993 } 1994 1995 if (unlikely(!multicast && skb->sk && 1996 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 1997 struct sk_buff *orig_skb = skb; 1998 1999 skb = skb_clone(skb, GFP_ATOMIC); 2000 if (skb) { 2001 unsigned long flags; 2002 int id, r; 2003 2004 spin_lock_irqsave(&local->ack_status_lock, flags); 2005 r = idr_get_new_above(&local->ack_status_frames, 2006 orig_skb, 1, &id); 2007 if (r == -EAGAIN) { 2008 idr_pre_get(&local->ack_status_frames, 2009 GFP_ATOMIC); 2010 r = idr_get_new_above(&local->ack_status_frames, 2011 orig_skb, 1, &id); 2012 } 2013 if (WARN_ON(!id) || id > 0xffff) { 2014 idr_remove(&local->ack_status_frames, id); 2015 r = -ERANGE; 2016 } 2017 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2018 2019 if (!r) { 2020 info_id = id; 2021 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2022 } else if (skb_shared(skb)) { 2023 kfree_skb(orig_skb); 2024 } else { 2025 kfree_skb(skb); 2026 skb = orig_skb; 2027 } 2028 } else { 2029 /* couldn't clone -- lose tx status ... */ 2030 skb = orig_skb; 2031 } 2032 } 2033 2034 /* 2035 * If the skb is shared we need to obtain our own copy. 2036 */ 2037 if (skb_shared(skb)) { 2038 struct sk_buff *tmp_skb = skb; 2039 2040 /* can't happen -- skb is a clone if info_id != 0 */ 2041 WARN_ON(info_id); 2042 2043 skb = skb_clone(skb, GFP_ATOMIC); 2044 kfree_skb(tmp_skb); 2045 2046 if (!skb) 2047 goto fail_rcu; 2048 } 2049 2050 hdr.frame_control = fc; 2051 hdr.duration_id = 0; 2052 hdr.seq_ctrl = 0; 2053 2054 skip_header_bytes = ETH_HLEN; 2055 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2056 encaps_data = bridge_tunnel_header; 2057 encaps_len = sizeof(bridge_tunnel_header); 2058 skip_header_bytes -= 2; 2059 } else if (ethertype >= 0x600) { 2060 encaps_data = rfc1042_header; 2061 encaps_len = sizeof(rfc1042_header); 2062 skip_header_bytes -= 2; 2063 } else { 2064 encaps_data = NULL; 2065 encaps_len = 0; 2066 } 2067 2068 nh_pos = skb_network_header(skb) - skb->data; 2069 h_pos = skb_transport_header(skb) - skb->data; 2070 2071 skb_pull(skb, skip_header_bytes); 2072 nh_pos -= skip_header_bytes; 2073 h_pos -= skip_header_bytes; 2074 2075 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2076 2077 /* 2078 * So we need to modify the skb header and hence need a copy of 2079 * that. The head_need variable above doesn't, so far, include 2080 * the needed header space that we don't need right away. If we 2081 * can, then we don't reallocate right now but only after the 2082 * frame arrives at the master device (if it does...) 2083 * 2084 * If we cannot, however, then we will reallocate to include all 2085 * the ever needed space. Also, if we need to reallocate it anyway, 2086 * make it big enough for everything we may ever need. 2087 */ 2088 2089 if (head_need > 0 || skb_cloned(skb)) { 2090 head_need += IEEE80211_ENCRYPT_HEADROOM; 2091 head_need += local->tx_headroom; 2092 head_need = max_t(int, 0, head_need); 2093 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2094 ieee80211_free_txskb(&local->hw, skb); 2095 skb = NULL; 2096 goto fail_rcu; 2097 } 2098 } 2099 2100 if (encaps_data) { 2101 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2102 nh_pos += encaps_len; 2103 h_pos += encaps_len; 2104 } 2105 2106 #ifdef CONFIG_MAC80211_MESH 2107 if (meshhdrlen > 0) { 2108 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2109 nh_pos += meshhdrlen; 2110 h_pos += meshhdrlen; 2111 } 2112 #endif 2113 2114 if (ieee80211_is_data_qos(fc)) { 2115 __le16 *qos_control; 2116 2117 qos_control = (__le16*) skb_push(skb, 2); 2118 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2119 /* 2120 * Maybe we could actually set some fields here, for now just 2121 * initialise to zero to indicate no special operation. 2122 */ 2123 *qos_control = 0; 2124 } else 2125 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2126 2127 nh_pos += hdrlen; 2128 h_pos += hdrlen; 2129 2130 dev->stats.tx_packets++; 2131 dev->stats.tx_bytes += skb->len; 2132 2133 /* Update skb pointers to various headers since this modified frame 2134 * is going to go through Linux networking code that may potentially 2135 * need things like pointer to IP header. */ 2136 skb_set_mac_header(skb, 0); 2137 skb_set_network_header(skb, nh_pos); 2138 skb_set_transport_header(skb, h_pos); 2139 2140 info = IEEE80211_SKB_CB(skb); 2141 memset(info, 0, sizeof(*info)); 2142 2143 dev->trans_start = jiffies; 2144 2145 info->flags = info_flags; 2146 info->ack_frame_id = info_id; 2147 2148 ieee80211_xmit(sdata, skb, band); 2149 rcu_read_unlock(); 2150 2151 return NETDEV_TX_OK; 2152 2153 fail_rcu: 2154 rcu_read_unlock(); 2155 fail: 2156 dev_kfree_skb(skb); 2157 return NETDEV_TX_OK; 2158 } 2159 2160 2161 /* 2162 * ieee80211_clear_tx_pending may not be called in a context where 2163 * it is possible that it packets could come in again. 2164 */ 2165 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2166 { 2167 struct sk_buff *skb; 2168 int i; 2169 2170 for (i = 0; i < local->hw.queues; i++) { 2171 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2172 ieee80211_free_txskb(&local->hw, skb); 2173 } 2174 } 2175 2176 /* 2177 * Returns false if the frame couldn't be transmitted but was queued instead, 2178 * which in this case means re-queued -- take as an indication to stop sending 2179 * more pending frames. 2180 */ 2181 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2182 struct sk_buff *skb) 2183 { 2184 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2185 struct ieee80211_sub_if_data *sdata; 2186 struct sta_info *sta; 2187 struct ieee80211_hdr *hdr; 2188 bool result; 2189 struct ieee80211_chanctx_conf *chanctx_conf; 2190 2191 sdata = vif_to_sdata(info->control.vif); 2192 2193 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2194 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2195 if (unlikely(!chanctx_conf)) { 2196 dev_kfree_skb(skb); 2197 return true; 2198 } 2199 result = ieee80211_tx(sdata, skb, true, 2200 chanctx_conf->def.chan->band); 2201 } else { 2202 struct sk_buff_head skbs; 2203 2204 __skb_queue_head_init(&skbs); 2205 __skb_queue_tail(&skbs, skb); 2206 2207 hdr = (struct ieee80211_hdr *)skb->data; 2208 sta = sta_info_get(sdata, hdr->addr1); 2209 2210 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2211 } 2212 2213 return result; 2214 } 2215 2216 /* 2217 * Transmit all pending packets. Called from tasklet. 2218 */ 2219 void ieee80211_tx_pending(unsigned long data) 2220 { 2221 struct ieee80211_local *local = (struct ieee80211_local *)data; 2222 unsigned long flags; 2223 int i; 2224 bool txok; 2225 2226 rcu_read_lock(); 2227 2228 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2229 for (i = 0; i < local->hw.queues; i++) { 2230 /* 2231 * If queue is stopped by something other than due to pending 2232 * frames, or we have no pending frames, proceed to next queue. 2233 */ 2234 if (local->queue_stop_reasons[i] || 2235 skb_queue_empty(&local->pending[i])) 2236 continue; 2237 2238 while (!skb_queue_empty(&local->pending[i])) { 2239 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2240 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2241 2242 if (WARN_ON(!info->control.vif)) { 2243 ieee80211_free_txskb(&local->hw, skb); 2244 continue; 2245 } 2246 2247 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2248 flags); 2249 2250 txok = ieee80211_tx_pending_skb(local, skb); 2251 spin_lock_irqsave(&local->queue_stop_reason_lock, 2252 flags); 2253 if (!txok) 2254 break; 2255 } 2256 2257 if (skb_queue_empty(&local->pending[i])) 2258 ieee80211_propagate_queue_wake(local, i); 2259 } 2260 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2261 2262 rcu_read_unlock(); 2263 } 2264 2265 /* functions for drivers to get certain frames */ 2266 2267 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2268 struct ps_data *ps, 2269 struct sk_buff *skb) 2270 { 2271 u8 *pos, *tim; 2272 int aid0 = 0; 2273 int i, have_bits = 0, n1, n2; 2274 2275 /* Generate bitmap for TIM only if there are any STAs in power save 2276 * mode. */ 2277 if (atomic_read(&ps->num_sta_ps) > 0) 2278 /* in the hope that this is faster than 2279 * checking byte-for-byte */ 2280 have_bits = !bitmap_empty((unsigned long*)ps->tim, 2281 IEEE80211_MAX_AID+1); 2282 2283 if (ps->dtim_count == 0) 2284 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2285 else 2286 ps->dtim_count--; 2287 2288 tim = pos = (u8 *) skb_put(skb, 6); 2289 *pos++ = WLAN_EID_TIM; 2290 *pos++ = 4; 2291 *pos++ = ps->dtim_count; 2292 *pos++ = sdata->vif.bss_conf.dtim_period; 2293 2294 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2295 aid0 = 1; 2296 2297 ps->dtim_bc_mc = aid0 == 1; 2298 2299 if (have_bits) { 2300 /* Find largest even number N1 so that bits numbered 1 through 2301 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2302 * (N2 + 1) x 8 through 2007 are 0. */ 2303 n1 = 0; 2304 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2305 if (ps->tim[i]) { 2306 n1 = i & 0xfe; 2307 break; 2308 } 2309 } 2310 n2 = n1; 2311 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2312 if (ps->tim[i]) { 2313 n2 = i; 2314 break; 2315 } 2316 } 2317 2318 /* Bitmap control */ 2319 *pos++ = n1 | aid0; 2320 /* Part Virt Bitmap */ 2321 skb_put(skb, n2 - n1); 2322 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2323 2324 tim[1] = n2 - n1 + 4; 2325 } else { 2326 *pos++ = aid0; /* Bitmap control */ 2327 *pos++ = 0; /* Part Virt Bitmap */ 2328 } 2329 } 2330 2331 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2332 struct ieee80211_vif *vif, 2333 u16 *tim_offset, u16 *tim_length) 2334 { 2335 struct ieee80211_local *local = hw_to_local(hw); 2336 struct sk_buff *skb = NULL; 2337 struct ieee80211_tx_info *info; 2338 struct ieee80211_sub_if_data *sdata = NULL; 2339 enum ieee80211_band band; 2340 struct ieee80211_tx_rate_control txrc; 2341 struct ieee80211_chanctx_conf *chanctx_conf; 2342 2343 rcu_read_lock(); 2344 2345 sdata = vif_to_sdata(vif); 2346 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2347 2348 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2349 goto out; 2350 2351 if (tim_offset) 2352 *tim_offset = 0; 2353 if (tim_length) 2354 *tim_length = 0; 2355 2356 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2357 struct ieee80211_if_ap *ap = &sdata->u.ap; 2358 struct beacon_data *beacon = rcu_dereference(ap->beacon); 2359 2360 if (beacon) { 2361 /* 2362 * headroom, head length, 2363 * tail length and maximum TIM length 2364 */ 2365 skb = dev_alloc_skb(local->tx_headroom + 2366 beacon->head_len + 2367 beacon->tail_len + 256); 2368 if (!skb) 2369 goto out; 2370 2371 skb_reserve(skb, local->tx_headroom); 2372 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2373 beacon->head_len); 2374 2375 /* 2376 * Not very nice, but we want to allow the driver to call 2377 * ieee80211_beacon_get() as a response to the set_tim() 2378 * callback. That, however, is already invoked under the 2379 * sta_lock to guarantee consistent and race-free update 2380 * of the tim bitmap in mac80211 and the driver. 2381 */ 2382 if (local->tim_in_locked_section) { 2383 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2384 } else { 2385 unsigned long flags; 2386 2387 spin_lock_irqsave(&local->tim_lock, flags); 2388 ieee80211_beacon_add_tim(sdata, &ap->ps, skb); 2389 spin_unlock_irqrestore(&local->tim_lock, flags); 2390 } 2391 2392 if (tim_offset) 2393 *tim_offset = beacon->head_len; 2394 if (tim_length) 2395 *tim_length = skb->len - beacon->head_len; 2396 2397 if (beacon->tail) 2398 memcpy(skb_put(skb, beacon->tail_len), 2399 beacon->tail, beacon->tail_len); 2400 } else 2401 goto out; 2402 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2403 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2404 struct ieee80211_hdr *hdr; 2405 struct sk_buff *presp = rcu_dereference(ifibss->presp); 2406 2407 if (!presp) 2408 goto out; 2409 2410 skb = skb_copy(presp, GFP_ATOMIC); 2411 if (!skb) 2412 goto out; 2413 2414 hdr = (struct ieee80211_hdr *) skb->data; 2415 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2416 IEEE80211_STYPE_BEACON); 2417 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2418 struct ieee80211_mgmt *mgmt; 2419 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2420 u8 *pos; 2421 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) + 2422 sizeof(mgmt->u.beacon); 2423 2424 #ifdef CONFIG_MAC80211_MESH 2425 if (!sdata->u.mesh.mesh_id_len) 2426 goto out; 2427 #endif 2428 2429 if (ifmsh->sync_ops) 2430 ifmsh->sync_ops->adjust_tbtt( 2431 sdata); 2432 2433 skb = dev_alloc_skb(local->tx_headroom + 2434 hdr_len + 2435 2 + /* NULL SSID */ 2436 2 + 8 + /* supported rates */ 2437 2 + 3 + /* DS params */ 2438 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2439 2 + sizeof(struct ieee80211_ht_cap) + 2440 2 + sizeof(struct ieee80211_ht_operation) + 2441 2 + sdata->u.mesh.mesh_id_len + 2442 2 + sizeof(struct ieee80211_meshconf_ie) + 2443 sdata->u.mesh.ie_len); 2444 if (!skb) 2445 goto out; 2446 2447 skb_reserve(skb, local->hw.extra_tx_headroom); 2448 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); 2449 memset(mgmt, 0, hdr_len); 2450 mgmt->frame_control = 2451 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); 2452 eth_broadcast_addr(mgmt->da); 2453 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 2454 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 2455 mgmt->u.beacon.beacon_int = 2456 cpu_to_le16(sdata->vif.bss_conf.beacon_int); 2457 mgmt->u.beacon.capab_info |= cpu_to_le16( 2458 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0); 2459 2460 pos = skb_put(skb, 2); 2461 *pos++ = WLAN_EID_SSID; 2462 *pos++ = 0x0; 2463 2464 band = chanctx_conf->def.chan->band; 2465 2466 if (ieee80211_add_srates_ie(sdata, skb, true, band) || 2467 mesh_add_ds_params_ie(skb, sdata) || 2468 ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 2469 mesh_add_rsn_ie(skb, sdata) || 2470 mesh_add_ht_cap_ie(skb, sdata) || 2471 mesh_add_ht_oper_ie(skb, sdata) || 2472 mesh_add_meshid_ie(skb, sdata) || 2473 mesh_add_meshconf_ie(skb, sdata) || 2474 mesh_add_vendor_ies(skb, sdata)) { 2475 pr_err("o11s: couldn't add ies!\n"); 2476 goto out; 2477 } 2478 } else { 2479 WARN_ON(1); 2480 goto out; 2481 } 2482 2483 band = chanctx_conf->def.chan->band; 2484 2485 info = IEEE80211_SKB_CB(skb); 2486 2487 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2488 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2489 info->band = band; 2490 2491 memset(&txrc, 0, sizeof(txrc)); 2492 txrc.hw = hw; 2493 txrc.sband = local->hw.wiphy->bands[band]; 2494 txrc.bss_conf = &sdata->vif.bss_conf; 2495 txrc.skb = skb; 2496 txrc.reported_rate.idx = -1; 2497 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2498 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2499 txrc.max_rate_idx = -1; 2500 else 2501 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2502 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band], 2503 sizeof(txrc.rate_idx_mcs_mask)); 2504 txrc.bss = true; 2505 rate_control_get_rate(sdata, NULL, &txrc); 2506 2507 info->control.vif = vif; 2508 2509 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2510 IEEE80211_TX_CTL_ASSIGN_SEQ | 2511 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2512 out: 2513 rcu_read_unlock(); 2514 return skb; 2515 } 2516 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2517 2518 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2519 struct ieee80211_vif *vif) 2520 { 2521 struct ieee80211_if_ap *ap = NULL; 2522 struct sk_buff *skb = NULL; 2523 struct probe_resp *presp = NULL; 2524 struct ieee80211_hdr *hdr; 2525 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2526 2527 if (sdata->vif.type != NL80211_IFTYPE_AP) 2528 return NULL; 2529 2530 rcu_read_lock(); 2531 2532 ap = &sdata->u.ap; 2533 presp = rcu_dereference(ap->probe_resp); 2534 if (!presp) 2535 goto out; 2536 2537 skb = dev_alloc_skb(presp->len); 2538 if (!skb) 2539 goto out; 2540 2541 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2542 2543 hdr = (struct ieee80211_hdr *) skb->data; 2544 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2545 2546 out: 2547 rcu_read_unlock(); 2548 return skb; 2549 } 2550 EXPORT_SYMBOL(ieee80211_proberesp_get); 2551 2552 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2553 struct ieee80211_vif *vif) 2554 { 2555 struct ieee80211_sub_if_data *sdata; 2556 struct ieee80211_if_managed *ifmgd; 2557 struct ieee80211_pspoll *pspoll; 2558 struct ieee80211_local *local; 2559 struct sk_buff *skb; 2560 2561 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2562 return NULL; 2563 2564 sdata = vif_to_sdata(vif); 2565 ifmgd = &sdata->u.mgd; 2566 local = sdata->local; 2567 2568 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2569 if (!skb) 2570 return NULL; 2571 2572 skb_reserve(skb, local->hw.extra_tx_headroom); 2573 2574 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2575 memset(pspoll, 0, sizeof(*pspoll)); 2576 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2577 IEEE80211_STYPE_PSPOLL); 2578 pspoll->aid = cpu_to_le16(ifmgd->aid); 2579 2580 /* aid in PS-Poll has its two MSBs each set to 1 */ 2581 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2582 2583 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2584 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2585 2586 return skb; 2587 } 2588 EXPORT_SYMBOL(ieee80211_pspoll_get); 2589 2590 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2591 struct ieee80211_vif *vif) 2592 { 2593 struct ieee80211_hdr_3addr *nullfunc; 2594 struct ieee80211_sub_if_data *sdata; 2595 struct ieee80211_if_managed *ifmgd; 2596 struct ieee80211_local *local; 2597 struct sk_buff *skb; 2598 2599 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2600 return NULL; 2601 2602 sdata = vif_to_sdata(vif); 2603 ifmgd = &sdata->u.mgd; 2604 local = sdata->local; 2605 2606 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2607 if (!skb) 2608 return NULL; 2609 2610 skb_reserve(skb, local->hw.extra_tx_headroom); 2611 2612 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2613 sizeof(*nullfunc)); 2614 memset(nullfunc, 0, sizeof(*nullfunc)); 2615 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2616 IEEE80211_STYPE_NULLFUNC | 2617 IEEE80211_FCTL_TODS); 2618 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2619 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2620 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2621 2622 return skb; 2623 } 2624 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2625 2626 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2627 struct ieee80211_vif *vif, 2628 const u8 *ssid, size_t ssid_len, 2629 size_t tailroom) 2630 { 2631 struct ieee80211_sub_if_data *sdata; 2632 struct ieee80211_local *local; 2633 struct ieee80211_hdr_3addr *hdr; 2634 struct sk_buff *skb; 2635 size_t ie_ssid_len; 2636 u8 *pos; 2637 2638 sdata = vif_to_sdata(vif); 2639 local = sdata->local; 2640 ie_ssid_len = 2 + ssid_len; 2641 2642 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2643 ie_ssid_len + tailroom); 2644 if (!skb) 2645 return NULL; 2646 2647 skb_reserve(skb, local->hw.extra_tx_headroom); 2648 2649 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2650 memset(hdr, 0, sizeof(*hdr)); 2651 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2652 IEEE80211_STYPE_PROBE_REQ); 2653 eth_broadcast_addr(hdr->addr1); 2654 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2655 eth_broadcast_addr(hdr->addr3); 2656 2657 pos = skb_put(skb, ie_ssid_len); 2658 *pos++ = WLAN_EID_SSID; 2659 *pos++ = ssid_len; 2660 if (ssid_len) 2661 memcpy(pos, ssid, ssid_len); 2662 pos += ssid_len; 2663 2664 return skb; 2665 } 2666 EXPORT_SYMBOL(ieee80211_probereq_get); 2667 2668 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2669 const void *frame, size_t frame_len, 2670 const struct ieee80211_tx_info *frame_txctl, 2671 struct ieee80211_rts *rts) 2672 { 2673 const struct ieee80211_hdr *hdr = frame; 2674 2675 rts->frame_control = 2676 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2677 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2678 frame_txctl); 2679 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2680 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2681 } 2682 EXPORT_SYMBOL(ieee80211_rts_get); 2683 2684 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2685 const void *frame, size_t frame_len, 2686 const struct ieee80211_tx_info *frame_txctl, 2687 struct ieee80211_cts *cts) 2688 { 2689 const struct ieee80211_hdr *hdr = frame; 2690 2691 cts->frame_control = 2692 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2693 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2694 frame_len, frame_txctl); 2695 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2696 } 2697 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2698 2699 struct sk_buff * 2700 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2701 struct ieee80211_vif *vif) 2702 { 2703 struct ieee80211_local *local = hw_to_local(hw); 2704 struct sk_buff *skb = NULL; 2705 struct ieee80211_tx_data tx; 2706 struct ieee80211_sub_if_data *sdata; 2707 struct ps_data *ps; 2708 struct ieee80211_tx_info *info; 2709 struct ieee80211_chanctx_conf *chanctx_conf; 2710 2711 sdata = vif_to_sdata(vif); 2712 2713 rcu_read_lock(); 2714 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2715 2716 if (!chanctx_conf) 2717 goto out; 2718 2719 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2720 struct beacon_data *beacon = 2721 rcu_dereference(sdata->u.ap.beacon); 2722 2723 if (!beacon || !beacon->head) 2724 goto out; 2725 2726 ps = &sdata->u.ap.ps; 2727 } else { 2728 goto out; 2729 } 2730 2731 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2732 goto out; /* send buffered bc/mc only after DTIM beacon */ 2733 2734 while (1) { 2735 skb = skb_dequeue(&ps->bc_buf); 2736 if (!skb) 2737 goto out; 2738 local->total_ps_buffered--; 2739 2740 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2741 struct ieee80211_hdr *hdr = 2742 (struct ieee80211_hdr *) skb->data; 2743 /* more buffered multicast/broadcast frames ==> set 2744 * MoreData flag in IEEE 802.11 header to inform PS 2745 * STAs */ 2746 hdr->frame_control |= 2747 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 2748 } 2749 2750 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 2751 break; 2752 dev_kfree_skb_any(skb); 2753 } 2754 2755 info = IEEE80211_SKB_CB(skb); 2756 2757 tx.flags |= IEEE80211_TX_PS_BUFFERED; 2758 info->band = chanctx_conf->def.chan->band; 2759 2760 if (invoke_tx_handlers(&tx)) 2761 skb = NULL; 2762 out: 2763 rcu_read_unlock(); 2764 2765 return skb; 2766 } 2767 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 2768 2769 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 2770 struct sk_buff *skb, int tid, 2771 enum ieee80211_band band) 2772 { 2773 int ac = ieee802_1d_to_ac[tid & 7]; 2774 2775 skb_set_mac_header(skb, 0); 2776 skb_set_network_header(skb, 0); 2777 skb_set_transport_header(skb, 0); 2778 2779 skb_set_queue_mapping(skb, ac); 2780 skb->priority = tid; 2781 2782 /* 2783 * The other path calling ieee80211_xmit is from the tasklet, 2784 * and while we can handle concurrent transmissions locking 2785 * requirements are that we do not come into tx with bhs on. 2786 */ 2787 local_bh_disable(); 2788 ieee80211_xmit(sdata, skb, band); 2789 local_bh_enable(); 2790 } 2791