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 <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <asm/unaligned.h> 26 27 #include "ieee80211_i.h" 28 #include "ieee80211_led.h" 29 #include "wep.h" 30 #include "wpa.h" 31 #include "wme.h" 32 #include "ieee80211_rate.h" 33 34 #define IEEE80211_TX_OK 0 35 #define IEEE80211_TX_AGAIN 1 36 #define IEEE80211_TX_FRAG_AGAIN 2 37 38 /* misc utils */ 39 40 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata, 41 struct ieee80211_hdr *hdr) 42 { 43 /* Set the sequence number for this frame. */ 44 hdr->seq_ctrl = cpu_to_le16(sdata->sequence); 45 46 /* Increase the sequence number. */ 47 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ; 48 } 49 50 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP 51 static void ieee80211_dump_frame(const char *ifname, const char *title, 52 const struct sk_buff *skb) 53 { 54 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 55 u16 fc; 56 int hdrlen; 57 DECLARE_MAC_BUF(mac); 58 59 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len); 60 if (skb->len < 4) { 61 printk("\n"); 62 return; 63 } 64 65 fc = le16_to_cpu(hdr->frame_control); 66 hdrlen = ieee80211_get_hdrlen(fc); 67 if (hdrlen > skb->len) 68 hdrlen = skb->len; 69 if (hdrlen >= 4) 70 printk(" FC=0x%04x DUR=0x%04x", 71 fc, le16_to_cpu(hdr->duration_id)); 72 if (hdrlen >= 10) 73 printk(" A1=%s", print_mac(mac, hdr->addr1)); 74 if (hdrlen >= 16) 75 printk(" A2=%s", print_mac(mac, hdr->addr2)); 76 if (hdrlen >= 24) 77 printk(" A3=%s", print_mac(mac, hdr->addr3)); 78 if (hdrlen >= 30) 79 printk(" A4=%s", print_mac(mac, hdr->addr4)); 80 printk("\n"); 81 } 82 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ 83 static inline void ieee80211_dump_frame(const char *ifname, const char *title, 84 struct sk_buff *skb) 85 { 86 } 87 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */ 88 89 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr, 90 int next_frag_len) 91 { 92 int rate, mrate, erp, dur, i; 93 struct ieee80211_rate *txrate = tx->u.tx.rate; 94 struct ieee80211_local *local = tx->local; 95 struct ieee80211_hw_mode *mode = tx->u.tx.mode; 96 97 erp = txrate->flags & IEEE80211_RATE_ERP; 98 99 /* 100 * data and mgmt (except PS Poll): 101 * - during CFP: 32768 102 * - during contention period: 103 * if addr1 is group address: 0 104 * if more fragments = 0 and addr1 is individual address: time to 105 * transmit one ACK plus SIFS 106 * if more fragments = 1 and addr1 is individual address: time to 107 * transmit next fragment plus 2 x ACK plus 3 x SIFS 108 * 109 * IEEE 802.11, 9.6: 110 * - control response frame (CTS or ACK) shall be transmitted using the 111 * same rate as the immediately previous frame in the frame exchange 112 * sequence, if this rate belongs to the PHY mandatory rates, or else 113 * at the highest possible rate belonging to the PHY rates in the 114 * BSSBasicRateSet 115 */ 116 117 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) { 118 /* TODO: These control frames are not currently sent by 119 * 80211.o, but should they be implemented, this function 120 * needs to be updated to support duration field calculation. 121 * 122 * RTS: time needed to transmit pending data/mgmt frame plus 123 * one CTS frame plus one ACK frame plus 3 x SIFS 124 * CTS: duration of immediately previous RTS minus time 125 * required to transmit CTS and its SIFS 126 * ACK: 0 if immediately previous directed data/mgmt had 127 * more=0, with more=1 duration in ACK frame is duration 128 * from previous frame minus time needed to transmit ACK 129 * and its SIFS 130 * PS Poll: BIT(15) | BIT(14) | aid 131 */ 132 return 0; 133 } 134 135 /* data/mgmt */ 136 if (0 /* FIX: data/mgmt during CFP */) 137 return 32768; 138 139 if (group_addr) /* Group address as the destination - no ACK */ 140 return 0; 141 142 /* Individual destination address: 143 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 144 * CTS and ACK frames shall be transmitted using the highest rate in 145 * basic rate set that is less than or equal to the rate of the 146 * immediately previous frame and that is using the same modulation 147 * (CCK or OFDM). If no basic rate set matches with these requirements, 148 * the highest mandatory rate of the PHY that is less than or equal to 149 * the rate of the previous frame is used. 150 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 151 */ 152 rate = -1; 153 mrate = 10; /* use 1 Mbps if everything fails */ 154 for (i = 0; i < mode->num_rates; i++) { 155 struct ieee80211_rate *r = &mode->rates[i]; 156 if (r->rate > txrate->rate) 157 break; 158 159 if (IEEE80211_RATE_MODULATION(txrate->flags) != 160 IEEE80211_RATE_MODULATION(r->flags)) 161 continue; 162 163 if (r->flags & IEEE80211_RATE_BASIC) 164 rate = r->rate; 165 else if (r->flags & IEEE80211_RATE_MANDATORY) 166 mrate = r->rate; 167 } 168 if (rate == -1) { 169 /* No matching basic rate found; use highest suitable mandatory 170 * PHY rate */ 171 rate = mrate; 172 } 173 174 /* Time needed to transmit ACK 175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 176 * to closest integer */ 177 178 dur = ieee80211_frame_duration(local, 10, rate, erp, 179 tx->sdata->bss_conf.use_short_preamble); 180 181 if (next_frag_len) { 182 /* Frame is fragmented: duration increases with time needed to 183 * transmit next fragment plus ACK and 2 x SIFS. */ 184 dur *= 2; /* ACK + SIFS */ 185 /* next fragment */ 186 dur += ieee80211_frame_duration(local, next_frag_len, 187 txrate->rate, erp, 188 tx->sdata->bss_conf.use_short_preamble); 189 } 190 191 return dur; 192 } 193 194 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local, 195 int queue) 196 { 197 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]); 198 } 199 200 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local, 201 int queue) 202 { 203 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]); 204 } 205 206 static int inline is_ieee80211_device(struct net_device *dev, 207 struct net_device *master) 208 { 209 return (wdev_priv(dev->ieee80211_ptr) == 210 wdev_priv(master->ieee80211_ptr)); 211 } 212 213 /* tx handlers */ 214 215 static ieee80211_txrx_result 216 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx) 217 { 218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 219 struct sk_buff *skb = tx->skb; 220 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 221 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 222 u32 sta_flags; 223 224 if (unlikely(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) 225 return TXRX_CONTINUE; 226 227 if (unlikely(tx->local->sta_sw_scanning) && 228 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT || 229 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ)) 230 return TXRX_DROP; 231 232 if (tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED) 233 return TXRX_CONTINUE; 234 235 sta_flags = tx->sta ? tx->sta->flags : 0; 236 237 if (likely(tx->flags & IEEE80211_TXRXD_TXUNICAST)) { 238 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) && 239 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS && 240 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) { 241 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 242 DECLARE_MAC_BUF(mac); 243 printk(KERN_DEBUG "%s: dropped data frame to not " 244 "associated station %s\n", 245 tx->dev->name, print_mac(mac, hdr->addr1)); 246 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 247 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 248 return TXRX_DROP; 249 } 250 } else { 251 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && 252 tx->local->num_sta == 0 && 253 tx->sdata->vif.type != IEEE80211_IF_TYPE_IBSS)) { 254 /* 255 * No associated STAs - no need to send multicast 256 * frames. 257 */ 258 return TXRX_DROP; 259 } 260 return TXRX_CONTINUE; 261 } 262 263 return TXRX_CONTINUE; 264 } 265 266 static ieee80211_txrx_result 267 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx) 268 { 269 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 270 271 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24) 272 ieee80211_include_sequence(tx->sdata, hdr); 273 274 return TXRX_CONTINUE; 275 } 276 277 /* This function is called whenever the AP is about to exceed the maximum limit 278 * of buffered frames for power saving STAs. This situation should not really 279 * happen often during normal operation, so dropping the oldest buffered packet 280 * from each queue should be OK to make some room for new frames. */ 281 static void purge_old_ps_buffers(struct ieee80211_local *local) 282 { 283 int total = 0, purged = 0; 284 struct sk_buff *skb; 285 struct ieee80211_sub_if_data *sdata; 286 struct sta_info *sta; 287 288 /* 289 * virtual interfaces are protected by RCU 290 */ 291 rcu_read_lock(); 292 293 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 294 struct ieee80211_if_ap *ap; 295 if (sdata->dev == local->mdev || 296 sdata->vif.type != IEEE80211_IF_TYPE_AP) 297 continue; 298 ap = &sdata->u.ap; 299 skb = skb_dequeue(&ap->ps_bc_buf); 300 if (skb) { 301 purged++; 302 dev_kfree_skb(skb); 303 } 304 total += skb_queue_len(&ap->ps_bc_buf); 305 } 306 rcu_read_unlock(); 307 308 read_lock_bh(&local->sta_lock); 309 list_for_each_entry(sta, &local->sta_list, list) { 310 skb = skb_dequeue(&sta->ps_tx_buf); 311 if (skb) { 312 purged++; 313 dev_kfree_skb(skb); 314 } 315 total += skb_queue_len(&sta->ps_tx_buf); 316 } 317 read_unlock_bh(&local->sta_lock); 318 319 local->total_ps_buffered = total; 320 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n", 321 wiphy_name(local->hw.wiphy), purged); 322 } 323 324 static ieee80211_txrx_result 325 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx) 326 { 327 /* 328 * broadcast/multicast frame 329 * 330 * If any of the associated stations is in power save mode, 331 * the frame is buffered to be sent after DTIM beacon frame. 332 * This is done either by the hardware or us. 333 */ 334 335 /* not AP/IBSS or ordered frame */ 336 if (!tx->sdata->bss || (tx->fc & IEEE80211_FCTL_ORDER)) 337 return TXRX_CONTINUE; 338 339 /* no stations in PS mode */ 340 if (!atomic_read(&tx->sdata->bss->num_sta_ps)) 341 return TXRX_CONTINUE; 342 343 /* buffered in mac80211 */ 344 if (tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) { 345 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 346 purge_old_ps_buffers(tx->local); 347 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= 348 AP_MAX_BC_BUFFER) { 349 if (net_ratelimit()) { 350 printk(KERN_DEBUG "%s: BC TX buffer full - " 351 "dropping the oldest frame\n", 352 tx->dev->name); 353 } 354 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf)); 355 } else 356 tx->local->total_ps_buffered++; 357 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb); 358 return TXRX_QUEUED; 359 } 360 361 /* buffered in hardware */ 362 tx->u.tx.control->flags |= IEEE80211_TXCTL_SEND_AFTER_DTIM; 363 364 return TXRX_CONTINUE; 365 } 366 367 static ieee80211_txrx_result 368 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx) 369 { 370 struct sta_info *sta = tx->sta; 371 DECLARE_MAC_BUF(mac); 372 373 if (unlikely(!sta || 374 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT && 375 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP))) 376 return TXRX_CONTINUE; 377 378 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) { 379 struct ieee80211_tx_packet_data *pkt_data; 380 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 381 printk(KERN_DEBUG "STA %s aid %d: PS buffer (entries " 382 "before %d)\n", 383 print_mac(mac, sta->addr), sta->aid, 384 skb_queue_len(&sta->ps_tx_buf)); 385 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 386 sta->flags |= WLAN_STA_TIM; 387 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 388 purge_old_ps_buffers(tx->local); 389 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) { 390 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf); 391 if (net_ratelimit()) { 392 printk(KERN_DEBUG "%s: STA %s TX " 393 "buffer full - dropping oldest frame\n", 394 tx->dev->name, print_mac(mac, sta->addr)); 395 } 396 dev_kfree_skb(old); 397 } else 398 tx->local->total_ps_buffered++; 399 /* Queue frame to be sent after STA sends an PS Poll frame */ 400 if (skb_queue_empty(&sta->ps_tx_buf)) { 401 if (tx->local->ops->set_tim) 402 tx->local->ops->set_tim(local_to_hw(tx->local), 403 sta->aid, 1); 404 if (tx->sdata->bss) 405 bss_tim_set(tx->local, tx->sdata->bss, sta->aid); 406 } 407 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb; 408 pkt_data->jiffies = jiffies; 409 skb_queue_tail(&sta->ps_tx_buf, tx->skb); 410 return TXRX_QUEUED; 411 } 412 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG 413 else if (unlikely(sta->flags & WLAN_STA_PS)) { 414 printk(KERN_DEBUG "%s: STA %s in PS mode, but pspoll " 415 "set -> send frame\n", tx->dev->name, 416 print_mac(mac, sta->addr)); 417 } 418 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ 419 sta->pspoll = 0; 420 421 return TXRX_CONTINUE; 422 } 423 424 static ieee80211_txrx_result 425 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx) 426 { 427 if (unlikely(tx->flags & IEEE80211_TXRXD_TXPS_BUFFERED)) 428 return TXRX_CONTINUE; 429 430 if (tx->flags & IEEE80211_TXRXD_TXUNICAST) 431 return ieee80211_tx_h_unicast_ps_buf(tx); 432 else 433 return ieee80211_tx_h_multicast_ps_buf(tx); 434 } 435 436 static ieee80211_txrx_result 437 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx) 438 { 439 struct ieee80211_key *key; 440 u16 fc = tx->fc; 441 442 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)) 443 tx->key = NULL; 444 else if (tx->sta && (key = rcu_dereference(tx->sta->key))) 445 tx->key = key; 446 else if ((key = rcu_dereference(tx->sdata->default_key))) 447 tx->key = key; 448 else if (tx->sdata->drop_unencrypted && 449 !(tx->u.tx.control->flags & IEEE80211_TXCTL_EAPOL_FRAME) && 450 !(tx->flags & IEEE80211_TXRXD_TX_INJECTED)) { 451 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 452 return TXRX_DROP; 453 } else 454 tx->key = NULL; 455 456 if (tx->key) { 457 u16 ftype, stype; 458 459 tx->key->tx_rx_count++; 460 /* TODO: add threshold stuff again */ 461 462 switch (tx->key->conf.alg) { 463 case ALG_WEP: 464 ftype = fc & IEEE80211_FCTL_FTYPE; 465 stype = fc & IEEE80211_FCTL_STYPE; 466 467 if (ftype == IEEE80211_FTYPE_MGMT && 468 stype == IEEE80211_STYPE_AUTH) 469 break; 470 case ALG_TKIP: 471 case ALG_CCMP: 472 if (!WLAN_FC_DATA_PRESENT(fc)) 473 tx->key = NULL; 474 break; 475 } 476 } 477 478 if (!tx->key || !(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 479 tx->u.tx.control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; 480 481 return TXRX_CONTINUE; 482 } 483 484 static ieee80211_txrx_result 485 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx) 486 { 487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; 488 size_t hdrlen, per_fragm, num_fragm, payload_len, left; 489 struct sk_buff **frags, *first, *frag; 490 int i; 491 u16 seq; 492 u8 *pos; 493 int frag_threshold = tx->local->fragmentation_threshold; 494 495 if (!(tx->flags & IEEE80211_TXRXD_FRAGMENTED)) 496 return TXRX_CONTINUE; 497 498 first = tx->skb; 499 500 hdrlen = ieee80211_get_hdrlen(tx->fc); 501 payload_len = first->len - hdrlen; 502 per_fragm = frag_threshold - hdrlen - FCS_LEN; 503 num_fragm = DIV_ROUND_UP(payload_len, per_fragm); 504 505 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC); 506 if (!frags) 507 goto fail; 508 509 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 510 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ; 511 pos = first->data + hdrlen + per_fragm; 512 left = payload_len - per_fragm; 513 for (i = 0; i < num_fragm - 1; i++) { 514 struct ieee80211_hdr *fhdr; 515 size_t copylen; 516 517 if (left <= 0) 518 goto fail; 519 520 /* reserve enough extra head and tail room for possible 521 * encryption */ 522 frag = frags[i] = 523 dev_alloc_skb(tx->local->tx_headroom + 524 frag_threshold + 525 IEEE80211_ENCRYPT_HEADROOM + 526 IEEE80211_ENCRYPT_TAILROOM); 527 if (!frag) 528 goto fail; 529 /* Make sure that all fragments use the same priority so 530 * that they end up using the same TX queue */ 531 frag->priority = first->priority; 532 skb_reserve(frag, tx->local->tx_headroom + 533 IEEE80211_ENCRYPT_HEADROOM); 534 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen); 535 memcpy(fhdr, first->data, hdrlen); 536 if (i == num_fragm - 2) 537 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS); 538 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG)); 539 copylen = left > per_fragm ? per_fragm : left; 540 memcpy(skb_put(frag, copylen), pos, copylen); 541 542 pos += copylen; 543 left -= copylen; 544 } 545 skb_trim(first, hdrlen + per_fragm); 546 547 tx->u.tx.num_extra_frag = num_fragm - 1; 548 tx->u.tx.extra_frag = frags; 549 550 return TXRX_CONTINUE; 551 552 fail: 553 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name); 554 if (frags) { 555 for (i = 0; i < num_fragm - 1; i++) 556 if (frags[i]) 557 dev_kfree_skb(frags[i]); 558 kfree(frags); 559 } 560 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment); 561 return TXRX_DROP; 562 } 563 564 static ieee80211_txrx_result 565 ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx) 566 { 567 if (!tx->key) 568 return TXRX_CONTINUE; 569 570 switch (tx->key->conf.alg) { 571 case ALG_WEP: 572 return ieee80211_crypto_wep_encrypt(tx); 573 case ALG_TKIP: 574 return ieee80211_crypto_tkip_encrypt(tx); 575 case ALG_CCMP: 576 return ieee80211_crypto_ccmp_encrypt(tx); 577 } 578 579 /* not reached */ 580 WARN_ON(1); 581 return TXRX_DROP; 582 } 583 584 static ieee80211_txrx_result 585 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx) 586 { 587 struct rate_selection rsel; 588 589 if (likely(!tx->u.tx.rate)) { 590 rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel); 591 tx->u.tx.rate = rsel.rate; 592 if (unlikely(rsel.probe != NULL)) { 593 tx->u.tx.control->flags |= 594 IEEE80211_TXCTL_RATE_CTRL_PROBE; 595 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; 596 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val; 597 tx->u.tx.rate = rsel.probe; 598 } else 599 tx->u.tx.control->alt_retry_rate = -1; 600 601 if (!tx->u.tx.rate) 602 return TXRX_DROP; 603 } else 604 tx->u.tx.control->alt_retry_rate = -1; 605 606 if (tx->u.tx.mode->mode == MODE_IEEE80211G && 607 tx->sdata->bss_conf.use_cts_prot && 608 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) { 609 tx->u.tx.last_frag_rate = tx->u.tx.rate; 610 if (rsel.probe) 611 tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG; 612 else 613 tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; 614 tx->u.tx.rate = rsel.nonerp; 615 tx->u.tx.control->rate = rsel.nonerp; 616 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE; 617 } else { 618 tx->u.tx.last_frag_rate = tx->u.tx.rate; 619 tx->u.tx.control->rate = tx->u.tx.rate; 620 } 621 tx->u.tx.control->tx_rate = tx->u.tx.rate->val; 622 623 return TXRX_CONTINUE; 624 } 625 626 static ieee80211_txrx_result 627 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx) 628 { 629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data; 630 u16 fc = le16_to_cpu(hdr->frame_control); 631 u16 dur; 632 struct ieee80211_tx_control *control = tx->u.tx.control; 633 struct ieee80211_hw_mode *mode = tx->u.tx.mode; 634 635 if (!control->retry_limit) { 636 if (!is_multicast_ether_addr(hdr->addr1)) { 637 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold 638 && tx->local->rts_threshold < 639 IEEE80211_MAX_RTS_THRESHOLD) { 640 control->flags |= 641 IEEE80211_TXCTL_USE_RTS_CTS; 642 control->flags |= 643 IEEE80211_TXCTL_LONG_RETRY_LIMIT; 644 control->retry_limit = 645 tx->local->long_retry_limit; 646 } else { 647 control->retry_limit = 648 tx->local->short_retry_limit; 649 } 650 } else { 651 control->retry_limit = 1; 652 } 653 } 654 655 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) { 656 /* Do not use multiple retry rates when sending fragmented 657 * frames. 658 * TODO: The last fragment could still use multiple retry 659 * rates. */ 660 control->alt_retry_rate = -1; 661 } 662 663 /* Use CTS protection for unicast frames sent using extended rates if 664 * there are associated non-ERP stations and RTS/CTS is not configured 665 * for the frame. */ 666 if (mode->mode == MODE_IEEE80211G && 667 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) && 668 (tx->flags & IEEE80211_TXRXD_TXUNICAST) && 669 tx->sdata->bss_conf.use_cts_prot && 670 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS)) 671 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT; 672 673 /* Transmit data frames using short preambles if the driver supports 674 * short preambles at the selected rate and short preambles are 675 * available on the network at the current point in time. */ 676 if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && 677 (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) && 678 tx->sdata->bss_conf.use_short_preamble && 679 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) { 680 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2; 681 } 682 683 /* Setup duration field for the first fragment of the frame. Duration 684 * for remaining fragments will be updated when they are being sent 685 * to low-level driver in ieee80211_tx(). */ 686 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1), 687 (tx->flags & IEEE80211_TXRXD_FRAGMENTED) ? 688 tx->u.tx.extra_frag[0]->len : 0); 689 hdr->duration_id = cpu_to_le16(dur); 690 691 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) || 692 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) { 693 struct ieee80211_rate *rate; 694 695 /* Do not use multiple retry rates when using RTS/CTS */ 696 control->alt_retry_rate = -1; 697 698 /* Use min(data rate, max base rate) as CTS/RTS rate */ 699 rate = tx->u.tx.rate; 700 while (rate > mode->rates && 701 !(rate->flags & IEEE80211_RATE_BASIC)) 702 rate--; 703 704 control->rts_cts_rate = rate->val; 705 control->rts_rate = rate; 706 } 707 708 if (tx->sta) { 709 tx->sta->tx_packets++; 710 tx->sta->tx_fragments++; 711 tx->sta->tx_bytes += tx->skb->len; 712 if (tx->u.tx.extra_frag) { 713 int i; 714 tx->sta->tx_fragments += tx->u.tx.num_extra_frag; 715 for (i = 0; i < tx->u.tx.num_extra_frag; i++) { 716 tx->sta->tx_bytes += 717 tx->u.tx.extra_frag[i]->len; 718 } 719 } 720 } 721 722 return TXRX_CONTINUE; 723 } 724 725 static ieee80211_txrx_result 726 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx) 727 { 728 struct ieee80211_local *local = tx->local; 729 struct ieee80211_hw_mode *mode = tx->u.tx.mode; 730 struct sk_buff *skb = tx->skb; 731 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 732 u32 load = 0, hdrtime; 733 734 /* TODO: this could be part of tx_status handling, so that the number 735 * of retries would be known; TX rate should in that case be stored 736 * somewhere with the packet */ 737 738 /* Estimate total channel use caused by this frame */ 739 740 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values, 741 * 1 usec = 1/8 * (1080 / 10) = 13.5 */ 742 743 if (mode->mode == MODE_IEEE80211A || 744 (mode->mode == MODE_IEEE80211G && 745 tx->u.tx.rate->flags & IEEE80211_RATE_ERP)) 746 hdrtime = CHAN_UTIL_HDR_SHORT; 747 else 748 hdrtime = CHAN_UTIL_HDR_LONG; 749 750 load = hdrtime; 751 if (!is_multicast_ether_addr(hdr->addr1)) 752 load += hdrtime; 753 754 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS) 755 load += 2 * hdrtime; 756 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) 757 load += hdrtime; 758 759 load += skb->len * tx->u.tx.rate->rate_inv; 760 761 if (tx->u.tx.extra_frag) { 762 int i; 763 for (i = 0; i < tx->u.tx.num_extra_frag; i++) { 764 load += 2 * hdrtime; 765 load += tx->u.tx.extra_frag[i]->len * 766 tx->u.tx.rate->rate; 767 } 768 } 769 770 /* Divide channel_use by 8 to avoid wrapping around the counter */ 771 load >>= CHAN_UTIL_SHIFT; 772 local->channel_use_raw += load; 773 if (tx->sta) 774 tx->sta->channel_use_raw += load; 775 tx->sdata->channel_use_raw += load; 776 777 return TXRX_CONTINUE; 778 } 779 780 /* TODO: implement register/unregister functions for adding TX/RX handlers 781 * into ordered list */ 782 783 ieee80211_tx_handler ieee80211_tx_handlers[] = 784 { 785 ieee80211_tx_h_check_assoc, 786 ieee80211_tx_h_sequence, 787 ieee80211_tx_h_ps_buf, 788 ieee80211_tx_h_select_key, 789 ieee80211_tx_h_michael_mic_add, 790 ieee80211_tx_h_fragment, 791 ieee80211_tx_h_encrypt, 792 ieee80211_tx_h_rate_ctrl, 793 ieee80211_tx_h_misc, 794 ieee80211_tx_h_load_stats, 795 NULL 796 }; 797 798 /* actual transmit path */ 799 800 /* 801 * deal with packet injection down monitor interface 802 * with Radiotap Header -- only called for monitor mode interface 803 */ 804 static ieee80211_txrx_result 805 __ieee80211_parse_tx_radiotap(struct ieee80211_txrx_data *tx, 806 struct sk_buff *skb) 807 { 808 /* 809 * this is the moment to interpret and discard the radiotap header that 810 * must be at the start of the packet injected in Monitor mode 811 * 812 * Need to take some care with endian-ness since radiotap 813 * args are little-endian 814 */ 815 816 struct ieee80211_radiotap_iterator iterator; 817 struct ieee80211_radiotap_header *rthdr = 818 (struct ieee80211_radiotap_header *) skb->data; 819 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode; 820 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len); 821 struct ieee80211_tx_control *control = tx->u.tx.control; 822 823 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; 824 tx->flags |= IEEE80211_TXRXD_TX_INJECTED; 825 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED; 826 827 /* 828 * for every radiotap entry that is present 829 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 830 * entries present, or -EINVAL on error) 831 */ 832 833 while (!ret) { 834 int i, target_rate; 835 836 ret = ieee80211_radiotap_iterator_next(&iterator); 837 838 if (ret) 839 continue; 840 841 /* see if this argument is something we can use */ 842 switch (iterator.this_arg_index) { 843 /* 844 * You must take care when dereferencing iterator.this_arg 845 * for multibyte types... the pointer is not aligned. Use 846 * get_unaligned((type *)iterator.this_arg) to dereference 847 * iterator.this_arg for type "type" safely on all arches. 848 */ 849 case IEEE80211_RADIOTAP_RATE: 850 /* 851 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps 852 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps 853 */ 854 target_rate = (*iterator.this_arg) * 5; 855 for (i = 0; i < mode->num_rates; i++) { 856 struct ieee80211_rate *r = &mode->rates[i]; 857 858 if (r->rate == target_rate) { 859 tx->u.tx.rate = r; 860 break; 861 } 862 } 863 break; 864 865 case IEEE80211_RADIOTAP_ANTENNA: 866 /* 867 * radiotap uses 0 for 1st ant, mac80211 is 1 for 868 * 1st ant 869 */ 870 control->antenna_sel_tx = (*iterator.this_arg) + 1; 871 break; 872 873 case IEEE80211_RADIOTAP_DBM_TX_POWER: 874 control->power_level = *iterator.this_arg; 875 break; 876 877 case IEEE80211_RADIOTAP_FLAGS: 878 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 879 /* 880 * this indicates that the skb we have been 881 * handed has the 32-bit FCS CRC at the end... 882 * we should react to that by snipping it off 883 * because it will be recomputed and added 884 * on transmission 885 */ 886 if (skb->len < (iterator.max_length + FCS_LEN)) 887 return TXRX_DROP; 888 889 skb_trim(skb, skb->len - FCS_LEN); 890 } 891 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 892 control->flags &= 893 ~IEEE80211_TXCTL_DO_NOT_ENCRYPT; 894 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 895 tx->flags |= IEEE80211_TXRXD_FRAGMENTED; 896 break; 897 898 /* 899 * Please update the file 900 * Documentation/networking/mac80211-injection.txt 901 * when parsing new fields here. 902 */ 903 904 default: 905 break; 906 } 907 } 908 909 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 910 return TXRX_DROP; 911 912 /* 913 * remove the radiotap header 914 * iterator->max_length was sanity-checked against 915 * skb->len by iterator init 916 */ 917 skb_pull(skb, iterator.max_length); 918 919 return TXRX_CONTINUE; 920 } 921 922 /* 923 * initialises @tx 924 */ 925 static ieee80211_txrx_result 926 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx, 927 struct sk_buff *skb, 928 struct net_device *dev, 929 struct ieee80211_tx_control *control) 930 { 931 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 932 struct ieee80211_hdr *hdr; 933 struct ieee80211_sub_if_data *sdata; 934 935 int hdrlen; 936 937 memset(tx, 0, sizeof(*tx)); 938 tx->skb = skb; 939 tx->dev = dev; /* use original interface */ 940 tx->local = local; 941 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev); 942 tx->u.tx.control = control; 943 /* 944 * Set this flag (used below to indicate "automatic fragmentation"), 945 * it will be cleared/left by radiotap as desired. 946 */ 947 tx->flags |= IEEE80211_TXRXD_FRAGMENTED; 948 949 /* process and remove the injection radiotap header */ 950 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 951 if (unlikely(sdata->vif.type == IEEE80211_IF_TYPE_MNTR)) { 952 if (__ieee80211_parse_tx_radiotap(tx, skb) == TXRX_DROP) 953 return TXRX_DROP; 954 955 /* 956 * __ieee80211_parse_tx_radiotap has now removed 957 * the radiotap header that was present and pre-filled 958 * 'tx' with tx control information. 959 */ 960 } 961 962 hdr = (struct ieee80211_hdr *) skb->data; 963 964 tx->sta = sta_info_get(local, hdr->addr1); 965 tx->fc = le16_to_cpu(hdr->frame_control); 966 967 if (is_multicast_ether_addr(hdr->addr1)) { 968 tx->flags &= ~IEEE80211_TXRXD_TXUNICAST; 969 control->flags |= IEEE80211_TXCTL_NO_ACK; 970 } else { 971 tx->flags |= IEEE80211_TXRXD_TXUNICAST; 972 control->flags &= ~IEEE80211_TXCTL_NO_ACK; 973 } 974 975 if (tx->flags & IEEE80211_TXRXD_FRAGMENTED) { 976 if ((tx->flags & IEEE80211_TXRXD_TXUNICAST) && 977 skb->len + FCS_LEN > local->fragmentation_threshold && 978 !local->ops->set_frag_threshold) 979 tx->flags |= IEEE80211_TXRXD_FRAGMENTED; 980 else 981 tx->flags &= ~IEEE80211_TXRXD_FRAGMENTED; 982 } 983 984 if (!tx->sta) 985 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; 986 else if (tx->sta->clear_dst_mask) { 987 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; 988 tx->sta->clear_dst_mask = 0; 989 } 990 991 hdrlen = ieee80211_get_hdrlen(tx->fc); 992 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) { 993 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)]; 994 tx->ethertype = (pos[0] << 8) | pos[1]; 995 } 996 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT; 997 998 return TXRX_CONTINUE; 999 } 1000 1001 /* 1002 * NB: @tx is uninitialised when passed in here 1003 */ 1004 static int ieee80211_tx_prepare(struct ieee80211_txrx_data *tx, 1005 struct sk_buff *skb, 1006 struct net_device *mdev, 1007 struct ieee80211_tx_control *control) 1008 { 1009 struct ieee80211_tx_packet_data *pkt_data; 1010 struct net_device *dev; 1011 1012 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; 1013 dev = dev_get_by_index(&init_net, pkt_data->ifindex); 1014 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) { 1015 dev_put(dev); 1016 dev = NULL; 1017 } 1018 if (unlikely(!dev)) 1019 return -ENODEV; 1020 /* initialises tx with control */ 1021 __ieee80211_tx_prepare(tx, skb, dev, control); 1022 dev_put(dev); 1023 return 0; 1024 } 1025 1026 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb, 1027 struct ieee80211_txrx_data *tx) 1028 { 1029 struct ieee80211_tx_control *control = tx->u.tx.control; 1030 int ret, i; 1031 1032 if (!ieee80211_qdisc_installed(local->mdev) && 1033 __ieee80211_queue_stopped(local, 0)) { 1034 netif_stop_queue(local->mdev); 1035 return IEEE80211_TX_AGAIN; 1036 } 1037 if (skb) { 1038 ieee80211_dump_frame(wiphy_name(local->hw.wiphy), 1039 "TX to low-level driver", skb); 1040 ret = local->ops->tx(local_to_hw(local), skb, control); 1041 if (ret) 1042 return IEEE80211_TX_AGAIN; 1043 local->mdev->trans_start = jiffies; 1044 ieee80211_led_tx(local, 1); 1045 } 1046 if (tx->u.tx.extra_frag) { 1047 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS | 1048 IEEE80211_TXCTL_USE_CTS_PROTECT | 1049 IEEE80211_TXCTL_CLEAR_DST_MASK | 1050 IEEE80211_TXCTL_FIRST_FRAGMENT); 1051 for (i = 0; i < tx->u.tx.num_extra_frag; i++) { 1052 if (!tx->u.tx.extra_frag[i]) 1053 continue; 1054 if (__ieee80211_queue_stopped(local, control->queue)) 1055 return IEEE80211_TX_FRAG_AGAIN; 1056 if (i == tx->u.tx.num_extra_frag) { 1057 control->tx_rate = tx->u.tx.last_frag_hwrate; 1058 control->rate = tx->u.tx.last_frag_rate; 1059 if (tx->flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG) 1060 control->flags |= 1061 IEEE80211_TXCTL_RATE_CTRL_PROBE; 1062 else 1063 control->flags &= 1064 ~IEEE80211_TXCTL_RATE_CTRL_PROBE; 1065 } 1066 1067 ieee80211_dump_frame(wiphy_name(local->hw.wiphy), 1068 "TX to low-level driver", 1069 tx->u.tx.extra_frag[i]); 1070 ret = local->ops->tx(local_to_hw(local), 1071 tx->u.tx.extra_frag[i], 1072 control); 1073 if (ret) 1074 return IEEE80211_TX_FRAG_AGAIN; 1075 local->mdev->trans_start = jiffies; 1076 ieee80211_led_tx(local, 1); 1077 tx->u.tx.extra_frag[i] = NULL; 1078 } 1079 kfree(tx->u.tx.extra_frag); 1080 tx->u.tx.extra_frag = NULL; 1081 } 1082 return IEEE80211_TX_OK; 1083 } 1084 1085 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb, 1086 struct ieee80211_tx_control *control) 1087 { 1088 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1089 struct sta_info *sta; 1090 ieee80211_tx_handler *handler; 1091 struct ieee80211_txrx_data tx; 1092 ieee80211_txrx_result res = TXRX_DROP, res_prepare; 1093 int ret, i; 1094 1095 WARN_ON(__ieee80211_queue_pending(local, control->queue)); 1096 1097 if (unlikely(skb->len < 10)) { 1098 dev_kfree_skb(skb); 1099 return 0; 1100 } 1101 1102 /* initialises tx */ 1103 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control); 1104 1105 if (res_prepare == TXRX_DROP) { 1106 dev_kfree_skb(skb); 1107 return 0; 1108 } 1109 1110 /* 1111 * key references are protected using RCU and this requires that 1112 * we are in a read-site RCU section during receive processing 1113 */ 1114 rcu_read_lock(); 1115 1116 sta = tx.sta; 1117 tx.u.tx.mode = local->hw.conf.mode; 1118 1119 for (handler = local->tx_handlers; *handler != NULL; 1120 handler++) { 1121 res = (*handler)(&tx); 1122 if (res != TXRX_CONTINUE) 1123 break; 1124 } 1125 1126 skb = tx.skb; /* handlers are allowed to change skb */ 1127 1128 if (sta) 1129 sta_info_put(sta); 1130 1131 if (unlikely(res == TXRX_DROP)) { 1132 I802_DEBUG_INC(local->tx_handlers_drop); 1133 goto drop; 1134 } 1135 1136 if (unlikely(res == TXRX_QUEUED)) { 1137 I802_DEBUG_INC(local->tx_handlers_queued); 1138 rcu_read_unlock(); 1139 return 0; 1140 } 1141 1142 if (tx.u.tx.extra_frag) { 1143 for (i = 0; i < tx.u.tx.num_extra_frag; i++) { 1144 int next_len, dur; 1145 struct ieee80211_hdr *hdr = 1146 (struct ieee80211_hdr *) 1147 tx.u.tx.extra_frag[i]->data; 1148 1149 if (i + 1 < tx.u.tx.num_extra_frag) { 1150 next_len = tx.u.tx.extra_frag[i + 1]->len; 1151 } else { 1152 next_len = 0; 1153 tx.u.tx.rate = tx.u.tx.last_frag_rate; 1154 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val; 1155 } 1156 dur = ieee80211_duration(&tx, 0, next_len); 1157 hdr->duration_id = cpu_to_le16(dur); 1158 } 1159 } 1160 1161 retry: 1162 ret = __ieee80211_tx(local, skb, &tx); 1163 if (ret) { 1164 struct ieee80211_tx_stored_packet *store = 1165 &local->pending_packet[control->queue]; 1166 1167 if (ret == IEEE80211_TX_FRAG_AGAIN) 1168 skb = NULL; 1169 set_bit(IEEE80211_LINK_STATE_PENDING, 1170 &local->state[control->queue]); 1171 smp_mb(); 1172 /* When the driver gets out of buffers during sending of 1173 * fragments and calls ieee80211_stop_queue, there is 1174 * a small window between IEEE80211_LINK_STATE_XOFF and 1175 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer 1176 * gets available in that window (i.e. driver calls 1177 * ieee80211_wake_queue), we would end up with ieee80211_tx 1178 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by 1179 * continuing transmitting here when that situation is 1180 * possible to have happened. */ 1181 if (!__ieee80211_queue_stopped(local, control->queue)) { 1182 clear_bit(IEEE80211_LINK_STATE_PENDING, 1183 &local->state[control->queue]); 1184 goto retry; 1185 } 1186 memcpy(&store->control, control, 1187 sizeof(struct ieee80211_tx_control)); 1188 store->skb = skb; 1189 store->extra_frag = tx.u.tx.extra_frag; 1190 store->num_extra_frag = tx.u.tx.num_extra_frag; 1191 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate; 1192 store->last_frag_rate = tx.u.tx.last_frag_rate; 1193 store->last_frag_rate_ctrl_probe = 1194 !!(tx.flags & IEEE80211_TXRXD_TXPROBE_LAST_FRAG); 1195 } 1196 rcu_read_unlock(); 1197 return 0; 1198 1199 drop: 1200 if (skb) 1201 dev_kfree_skb(skb); 1202 for (i = 0; i < tx.u.tx.num_extra_frag; i++) 1203 if (tx.u.tx.extra_frag[i]) 1204 dev_kfree_skb(tx.u.tx.extra_frag[i]); 1205 kfree(tx.u.tx.extra_frag); 1206 rcu_read_unlock(); 1207 return 0; 1208 } 1209 1210 /* device xmit handlers */ 1211 1212 int ieee80211_master_start_xmit(struct sk_buff *skb, 1213 struct net_device *dev) 1214 { 1215 struct ieee80211_tx_control control; 1216 struct ieee80211_tx_packet_data *pkt_data; 1217 struct net_device *odev = NULL; 1218 struct ieee80211_sub_if_data *osdata; 1219 int headroom; 1220 int ret; 1221 1222 /* 1223 * copy control out of the skb so other people can use skb->cb 1224 */ 1225 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; 1226 memset(&control, 0, sizeof(struct ieee80211_tx_control)); 1227 1228 if (pkt_data->ifindex) 1229 odev = dev_get_by_index(&init_net, pkt_data->ifindex); 1230 if (unlikely(odev && !is_ieee80211_device(odev, dev))) { 1231 dev_put(odev); 1232 odev = NULL; 1233 } 1234 if (unlikely(!odev)) { 1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1236 printk(KERN_DEBUG "%s: Discarded packet with nonexistent " 1237 "originating device\n", dev->name); 1238 #endif 1239 dev_kfree_skb(skb); 1240 return 0; 1241 } 1242 osdata = IEEE80211_DEV_TO_SUB_IF(odev); 1243 1244 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM; 1245 if (skb_headroom(skb) < headroom) { 1246 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 1247 dev_kfree_skb(skb); 1248 dev_put(odev); 1249 return 0; 1250 } 1251 } 1252 1253 control.vif = &osdata->vif; 1254 control.type = osdata->vif.type; 1255 if (pkt_data->flags & IEEE80211_TXPD_REQ_TX_STATUS) 1256 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS; 1257 if (pkt_data->flags & IEEE80211_TXPD_DO_NOT_ENCRYPT) 1258 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT; 1259 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) 1260 control.flags |= IEEE80211_TXCTL_REQUEUE; 1261 if (pkt_data->flags & IEEE80211_TXPD_EAPOL_FRAME) 1262 control.flags |= IEEE80211_TXCTL_EAPOL_FRAME; 1263 control.queue = pkt_data->queue; 1264 1265 ret = ieee80211_tx(odev, skb, &control); 1266 dev_put(odev); 1267 1268 return ret; 1269 } 1270 1271 int ieee80211_monitor_start_xmit(struct sk_buff *skb, 1272 struct net_device *dev) 1273 { 1274 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1275 struct ieee80211_tx_packet_data *pkt_data; 1276 struct ieee80211_radiotap_header *prthdr = 1277 (struct ieee80211_radiotap_header *)skb->data; 1278 u16 len_rthdr; 1279 1280 /* check for not even having the fixed radiotap header part */ 1281 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1282 goto fail; /* too short to be possibly valid */ 1283 1284 /* is it a header version we can trust to find length from? */ 1285 if (unlikely(prthdr->it_version)) 1286 goto fail; /* only version 0 is supported */ 1287 1288 /* then there must be a radiotap header with a length we can use */ 1289 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1290 1291 /* does the skb contain enough to deliver on the alleged length? */ 1292 if (unlikely(skb->len < len_rthdr)) 1293 goto fail; /* skb too short for claimed rt header extent */ 1294 1295 skb->dev = local->mdev; 1296 1297 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; 1298 memset(pkt_data, 0, sizeof(*pkt_data)); 1299 /* needed because we set skb device to master */ 1300 pkt_data->ifindex = dev->ifindex; 1301 1302 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; 1303 1304 /* 1305 * fix up the pointers accounting for the radiotap 1306 * header still being in there. We are being given 1307 * a precooked IEEE80211 header so no need for 1308 * normal processing 1309 */ 1310 skb_set_mac_header(skb, len_rthdr); 1311 /* 1312 * these are just fixed to the end of the rt area since we 1313 * don't have any better information and at this point, nobody cares 1314 */ 1315 skb_set_network_header(skb, len_rthdr); 1316 skb_set_transport_header(skb, len_rthdr); 1317 1318 /* pass the radiotap header up to the next stage intact */ 1319 dev_queue_xmit(skb); 1320 return NETDEV_TX_OK; 1321 1322 fail: 1323 dev_kfree_skb(skb); 1324 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1325 } 1326 1327 /** 1328 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1329 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1330 * @skb: packet to be sent 1331 * @dev: incoming interface 1332 * 1333 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1334 * not be freed, and caller is responsible for either retrying later or freeing 1335 * skb). 1336 * 1337 * This function takes in an Ethernet header and encapsulates it with suitable 1338 * IEEE 802.11 header based on which interface the packet is coming in. The 1339 * encapsulated packet will then be passed to master interface, wlan#.11, for 1340 * transmission (through low-level driver). 1341 */ 1342 int ieee80211_subif_start_xmit(struct sk_buff *skb, 1343 struct net_device *dev) 1344 { 1345 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1346 struct ieee80211_tx_packet_data *pkt_data; 1347 struct ieee80211_sub_if_data *sdata; 1348 int ret = 1, head_need; 1349 u16 ethertype, hdrlen, fc; 1350 struct ieee80211_hdr hdr; 1351 const u8 *encaps_data; 1352 int encaps_len, skip_header_bytes; 1353 int nh_pos, h_pos; 1354 struct sta_info *sta; 1355 u32 sta_flags = 0; 1356 1357 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1358 if (unlikely(skb->len < ETH_HLEN)) { 1359 printk(KERN_DEBUG "%s: short skb (len=%d)\n", 1360 dev->name, skb->len); 1361 ret = 0; 1362 goto fail; 1363 } 1364 1365 nh_pos = skb_network_header(skb) - skb->data; 1366 h_pos = skb_transport_header(skb) - skb->data; 1367 1368 /* convert Ethernet header to proper 802.11 header (based on 1369 * operation mode) */ 1370 ethertype = (skb->data[12] << 8) | skb->data[13]; 1371 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; 1372 1373 switch (sdata->vif.type) { 1374 case IEEE80211_IF_TYPE_AP: 1375 case IEEE80211_IF_TYPE_VLAN: 1376 fc |= IEEE80211_FCTL_FROMDS; 1377 /* DA BSSID SA */ 1378 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1379 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); 1380 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1381 hdrlen = 24; 1382 break; 1383 case IEEE80211_IF_TYPE_WDS: 1384 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; 1385 /* RA TA DA SA */ 1386 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1387 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN); 1388 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1389 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1390 hdrlen = 30; 1391 break; 1392 case IEEE80211_IF_TYPE_STA: 1393 fc |= IEEE80211_FCTL_TODS; 1394 /* BSSID SA DA */ 1395 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN); 1396 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1397 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1398 hdrlen = 24; 1399 break; 1400 case IEEE80211_IF_TYPE_IBSS: 1401 /* DA SA BSSID */ 1402 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1403 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1404 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN); 1405 hdrlen = 24; 1406 break; 1407 default: 1408 ret = 0; 1409 goto fail; 1410 } 1411 1412 sta = sta_info_get(local, hdr.addr1); 1413 if (sta) { 1414 sta_flags = sta->flags; 1415 sta_info_put(sta); 1416 } 1417 1418 /* receiver is QoS enabled, use a QoS type frame */ 1419 if (sta_flags & WLAN_STA_WME) { 1420 fc |= IEEE80211_STYPE_QOS_DATA; 1421 hdrlen += 2; 1422 } 1423 1424 /* 1425 * If port access control is enabled, drop frames to unauthorised 1426 * stations unless they are EAPOL frames from the local station. 1427 */ 1428 if (unlikely(sdata->ieee802_1x_pac && 1429 !(sta_flags & WLAN_STA_AUTHORIZED) && 1430 !(ethertype == ETH_P_PAE && 1431 compare_ether_addr(dev->dev_addr, 1432 skb->data + ETH_ALEN) == 0))) { 1433 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1434 DECLARE_MAC_BUF(mac); 1435 1436 if (net_ratelimit()) 1437 printk(KERN_DEBUG "%s: dropped frame to %s" 1438 " (unauthorized port)\n", dev->name, 1439 print_mac(mac, hdr.addr1)); 1440 #endif 1441 1442 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 1443 1444 ret = 0; 1445 goto fail; 1446 } 1447 1448 hdr.frame_control = cpu_to_le16(fc); 1449 hdr.duration_id = 0; 1450 hdr.seq_ctrl = 0; 1451 1452 skip_header_bytes = ETH_HLEN; 1453 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 1454 encaps_data = bridge_tunnel_header; 1455 encaps_len = sizeof(bridge_tunnel_header); 1456 skip_header_bytes -= 2; 1457 } else if (ethertype >= 0x600) { 1458 encaps_data = rfc1042_header; 1459 encaps_len = sizeof(rfc1042_header); 1460 skip_header_bytes -= 2; 1461 } else { 1462 encaps_data = NULL; 1463 encaps_len = 0; 1464 } 1465 1466 skb_pull(skb, skip_header_bytes); 1467 nh_pos -= skip_header_bytes; 1468 h_pos -= skip_header_bytes; 1469 1470 /* TODO: implement support for fragments so that there is no need to 1471 * reallocate and copy payload; it might be enough to support one 1472 * extra fragment that would be copied in the beginning of the frame 1473 * data.. anyway, it would be nice to include this into skb structure 1474 * somehow 1475 * 1476 * There are few options for this: 1477 * use skb->cb as an extra space for 802.11 header 1478 * allocate new buffer if not enough headroom 1479 * make sure that there is enough headroom in every skb by increasing 1480 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and 1481 * alloc_skb() (net/core/skbuff.c) 1482 */ 1483 head_need = hdrlen + encaps_len + local->tx_headroom; 1484 head_need -= skb_headroom(skb); 1485 1486 /* We are going to modify skb data, so make a copy of it if happens to 1487 * be cloned. This could happen, e.g., with Linux bridge code passing 1488 * us broadcast frames. */ 1489 1490 if (head_need > 0 || skb_cloned(skb)) { 1491 #if 0 1492 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes " 1493 "of headroom\n", dev->name, head_need); 1494 #endif 1495 1496 if (skb_cloned(skb)) 1497 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1498 else 1499 I802_DEBUG_INC(local->tx_expand_skb_head); 1500 /* Since we have to reallocate the buffer, make sure that there 1501 * is enough room for possible WEP IV/ICV and TKIP (8 bytes 1502 * before payload and 12 after). */ 1503 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8), 1504 12, GFP_ATOMIC)) { 1505 printk(KERN_DEBUG "%s: failed to reallocate TX buffer" 1506 "\n", dev->name); 1507 goto fail; 1508 } 1509 } 1510 1511 if (encaps_data) { 1512 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 1513 nh_pos += encaps_len; 1514 h_pos += encaps_len; 1515 } 1516 1517 if (fc & IEEE80211_STYPE_QOS_DATA) { 1518 __le16 *qos_control; 1519 1520 qos_control = (__le16*) skb_push(skb, 2); 1521 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 1522 /* 1523 * Maybe we could actually set some fields here, for now just 1524 * initialise to zero to indicate no special operation. 1525 */ 1526 *qos_control = 0; 1527 } else 1528 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 1529 1530 nh_pos += hdrlen; 1531 h_pos += hdrlen; 1532 1533 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; 1534 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data)); 1535 pkt_data->ifindex = dev->ifindex; 1536 if (ethertype == ETH_P_PAE) 1537 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME; 1538 1539 skb->dev = local->mdev; 1540 dev->stats.tx_packets++; 1541 dev->stats.tx_bytes += skb->len; 1542 1543 /* Update skb pointers to various headers since this modified frame 1544 * is going to go through Linux networking code that may potentially 1545 * need things like pointer to IP header. */ 1546 skb_set_mac_header(skb, 0); 1547 skb_set_network_header(skb, nh_pos); 1548 skb_set_transport_header(skb, h_pos); 1549 1550 dev->trans_start = jiffies; 1551 dev_queue_xmit(skb); 1552 1553 return 0; 1554 1555 fail: 1556 if (!ret) 1557 dev_kfree_skb(skb); 1558 1559 return ret; 1560 } 1561 1562 /* helper functions for pending packets for when queues are stopped */ 1563 1564 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 1565 { 1566 int i, j; 1567 struct ieee80211_tx_stored_packet *store; 1568 1569 for (i = 0; i < local->hw.queues; i++) { 1570 if (!__ieee80211_queue_pending(local, i)) 1571 continue; 1572 store = &local->pending_packet[i]; 1573 kfree_skb(store->skb); 1574 for (j = 0; j < store->num_extra_frag; j++) 1575 kfree_skb(store->extra_frag[j]); 1576 kfree(store->extra_frag); 1577 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]); 1578 } 1579 } 1580 1581 void ieee80211_tx_pending(unsigned long data) 1582 { 1583 struct ieee80211_local *local = (struct ieee80211_local *)data; 1584 struct net_device *dev = local->mdev; 1585 struct ieee80211_tx_stored_packet *store; 1586 struct ieee80211_txrx_data tx; 1587 int i, ret, reschedule = 0; 1588 1589 netif_tx_lock_bh(dev); 1590 for (i = 0; i < local->hw.queues; i++) { 1591 if (__ieee80211_queue_stopped(local, i)) 1592 continue; 1593 if (!__ieee80211_queue_pending(local, i)) { 1594 reschedule = 1; 1595 continue; 1596 } 1597 store = &local->pending_packet[i]; 1598 tx.u.tx.control = &store->control; 1599 tx.u.tx.extra_frag = store->extra_frag; 1600 tx.u.tx.num_extra_frag = store->num_extra_frag; 1601 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate; 1602 tx.u.tx.last_frag_rate = store->last_frag_rate; 1603 tx.flags = 0; 1604 if (store->last_frag_rate_ctrl_probe) 1605 tx.flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG; 1606 ret = __ieee80211_tx(local, store->skb, &tx); 1607 if (ret) { 1608 if (ret == IEEE80211_TX_FRAG_AGAIN) 1609 store->skb = NULL; 1610 } else { 1611 clear_bit(IEEE80211_LINK_STATE_PENDING, 1612 &local->state[i]); 1613 reschedule = 1; 1614 } 1615 } 1616 netif_tx_unlock_bh(dev); 1617 if (reschedule) { 1618 if (!ieee80211_qdisc_installed(dev)) { 1619 if (!__ieee80211_queue_stopped(local, 0)) 1620 netif_wake_queue(dev); 1621 } else 1622 netif_schedule(dev); 1623 } 1624 } 1625 1626 /* functions for drivers to get certain frames */ 1627 1628 static void ieee80211_beacon_add_tim(struct ieee80211_local *local, 1629 struct ieee80211_if_ap *bss, 1630 struct sk_buff *skb, 1631 struct beacon_data *beacon) 1632 { 1633 u8 *pos, *tim; 1634 int aid0 = 0; 1635 int i, have_bits = 0, n1, n2; 1636 1637 /* Generate bitmap for TIM only if there are any STAs in power save 1638 * mode. */ 1639 read_lock_bh(&local->sta_lock); 1640 if (atomic_read(&bss->num_sta_ps) > 0) 1641 /* in the hope that this is faster than 1642 * checking byte-for-byte */ 1643 have_bits = !bitmap_empty((unsigned long*)bss->tim, 1644 IEEE80211_MAX_AID+1); 1645 1646 if (bss->dtim_count == 0) 1647 bss->dtim_count = beacon->dtim_period - 1; 1648 else 1649 bss->dtim_count--; 1650 1651 tim = pos = (u8 *) skb_put(skb, 6); 1652 *pos++ = WLAN_EID_TIM; 1653 *pos++ = 4; 1654 *pos++ = bss->dtim_count; 1655 *pos++ = beacon->dtim_period; 1656 1657 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) 1658 aid0 = 1; 1659 1660 if (have_bits) { 1661 /* Find largest even number N1 so that bits numbered 1 through 1662 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 1663 * (N2 + 1) x 8 through 2007 are 0. */ 1664 n1 = 0; 1665 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 1666 if (bss->tim[i]) { 1667 n1 = i & 0xfe; 1668 break; 1669 } 1670 } 1671 n2 = n1; 1672 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 1673 if (bss->tim[i]) { 1674 n2 = i; 1675 break; 1676 } 1677 } 1678 1679 /* Bitmap control */ 1680 *pos++ = n1 | aid0; 1681 /* Part Virt Bitmap */ 1682 memcpy(pos, bss->tim + n1, n2 - n1 + 1); 1683 1684 tim[1] = n2 - n1 + 4; 1685 skb_put(skb, n2 - n1); 1686 } else { 1687 *pos++ = aid0; /* Bitmap control */ 1688 *pos++ = 0; /* Part Virt Bitmap */ 1689 } 1690 read_unlock_bh(&local->sta_lock); 1691 } 1692 1693 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, 1694 struct ieee80211_vif *vif, 1695 struct ieee80211_tx_control *control) 1696 { 1697 struct ieee80211_local *local = hw_to_local(hw); 1698 struct sk_buff *skb; 1699 struct net_device *bdev; 1700 struct ieee80211_sub_if_data *sdata = NULL; 1701 struct ieee80211_if_ap *ap = NULL; 1702 struct rate_selection rsel; 1703 struct beacon_data *beacon; 1704 1705 rcu_read_lock(); 1706 1707 sdata = vif_to_sdata(vif); 1708 bdev = sdata->dev; 1709 ap = &sdata->u.ap; 1710 1711 beacon = rcu_dereference(ap->beacon); 1712 1713 if (!ap || sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon) { 1714 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1715 if (net_ratelimit()) 1716 printk(KERN_DEBUG "no beacon data avail for %s\n", 1717 bdev->name); 1718 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ 1719 skb = NULL; 1720 goto out; 1721 } 1722 1723 /* headroom, head length, tail length and maximum TIM length */ 1724 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 1725 beacon->tail_len + 256); 1726 if (!skb) 1727 goto out; 1728 1729 skb_reserve(skb, local->tx_headroom); 1730 memcpy(skb_put(skb, beacon->head_len), beacon->head, 1731 beacon->head_len); 1732 1733 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data); 1734 1735 ieee80211_beacon_add_tim(local, ap, skb, beacon); 1736 1737 if (beacon->tail) 1738 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 1739 beacon->tail_len); 1740 1741 if (control) { 1742 rate_control_get_rate(local->mdev, local->oper_hw_mode, skb, 1743 &rsel); 1744 if (!rsel.rate) { 1745 if (net_ratelimit()) { 1746 printk(KERN_DEBUG "%s: ieee80211_beacon_get: " 1747 "no rate found\n", 1748 wiphy_name(local->hw.wiphy)); 1749 } 1750 dev_kfree_skb(skb); 1751 skb = NULL; 1752 goto out; 1753 } 1754 1755 control->vif = vif; 1756 control->tx_rate = 1757 (sdata->bss_conf.use_short_preamble && 1758 (rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ? 1759 rsel.rate->val2 : rsel.rate->val; 1760 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx; 1761 control->power_level = local->hw.conf.power_level; 1762 control->flags |= IEEE80211_TXCTL_NO_ACK; 1763 control->retry_limit = 1; 1764 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK; 1765 } 1766 1767 ap->num_beacons++; 1768 1769 out: 1770 rcu_read_unlock(); 1771 return skb; 1772 } 1773 EXPORT_SYMBOL(ieee80211_beacon_get); 1774 1775 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 1776 const void *frame, size_t frame_len, 1777 const struct ieee80211_tx_control *frame_txctl, 1778 struct ieee80211_rts *rts) 1779 { 1780 const struct ieee80211_hdr *hdr = frame; 1781 u16 fctl; 1782 1783 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS; 1784 rts->frame_control = cpu_to_le16(fctl); 1785 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 1786 frame_txctl); 1787 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 1788 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 1789 } 1790 EXPORT_SYMBOL(ieee80211_rts_get); 1791 1792 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 1793 const void *frame, size_t frame_len, 1794 const struct ieee80211_tx_control *frame_txctl, 1795 struct ieee80211_cts *cts) 1796 { 1797 const struct ieee80211_hdr *hdr = frame; 1798 u16 fctl; 1799 1800 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS; 1801 cts->frame_control = cpu_to_le16(fctl); 1802 cts->duration = ieee80211_ctstoself_duration(hw, vif, 1803 frame_len, frame_txctl); 1804 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 1805 } 1806 EXPORT_SYMBOL(ieee80211_ctstoself_get); 1807 1808 struct sk_buff * 1809 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 1810 struct ieee80211_vif *vif, 1811 struct ieee80211_tx_control *control) 1812 { 1813 struct ieee80211_local *local = hw_to_local(hw); 1814 struct sk_buff *skb; 1815 struct sta_info *sta; 1816 ieee80211_tx_handler *handler; 1817 struct ieee80211_txrx_data tx; 1818 ieee80211_txrx_result res = TXRX_DROP; 1819 struct net_device *bdev; 1820 struct ieee80211_sub_if_data *sdata; 1821 struct ieee80211_if_ap *bss = NULL; 1822 struct beacon_data *beacon; 1823 1824 sdata = vif_to_sdata(vif); 1825 bdev = sdata->dev; 1826 1827 1828 if (!bss) 1829 return NULL; 1830 1831 rcu_read_lock(); 1832 beacon = rcu_dereference(bss->beacon); 1833 1834 if (sdata->vif.type != IEEE80211_IF_TYPE_AP || !beacon || 1835 !beacon->head) { 1836 rcu_read_unlock(); 1837 return NULL; 1838 } 1839 rcu_read_unlock(); 1840 1841 if (bss->dtim_count != 0) 1842 return NULL; /* send buffered bc/mc only after DTIM beacon */ 1843 memset(control, 0, sizeof(*control)); 1844 while (1) { 1845 skb = skb_dequeue(&bss->ps_bc_buf); 1846 if (!skb) 1847 return NULL; 1848 local->total_ps_buffered--; 1849 1850 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) { 1851 struct ieee80211_hdr *hdr = 1852 (struct ieee80211_hdr *) skb->data; 1853 /* more buffered multicast/broadcast frames ==> set 1854 * MoreData flag in IEEE 802.11 header to inform PS 1855 * STAs */ 1856 hdr->frame_control |= 1857 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 1858 } 1859 1860 if (!ieee80211_tx_prepare(&tx, skb, local->mdev, control)) 1861 break; 1862 dev_kfree_skb_any(skb); 1863 } 1864 sta = tx.sta; 1865 tx.flags |= IEEE80211_TXRXD_TXPS_BUFFERED; 1866 tx.u.tx.mode = local->hw.conf.mode; 1867 1868 for (handler = local->tx_handlers; *handler != NULL; handler++) { 1869 res = (*handler)(&tx); 1870 if (res == TXRX_DROP || res == TXRX_QUEUED) 1871 break; 1872 } 1873 skb = tx.skb; /* handlers are allowed to change skb */ 1874 1875 if (res == TXRX_DROP) { 1876 I802_DEBUG_INC(local->tx_handlers_drop); 1877 dev_kfree_skb(skb); 1878 skb = NULL; 1879 } else if (res == TXRX_QUEUED) { 1880 I802_DEBUG_INC(local->tx_handlers_queued); 1881 skb = NULL; 1882 } 1883 1884 if (sta) 1885 sta_info_put(sta); 1886 1887 return skb; 1888 } 1889 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 1890