1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved. 4 * 5 * Contact Information: 6 * James P. Ketrenos <ipw2100-admin@linux.intel.com> 7 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 8 * 9 * Few modifications for Realtek's Wi-Fi drivers by 10 * Andrea Merello <andrea.merello@gmail.com> 11 * 12 * A special thanks goes to Realtek for their support ! 13 */ 14 #include <linux/compiler.h> 15 #include <linux/errno.h> 16 #include <linux/if_arp.h> 17 #include <linux/in6.h> 18 #include <linux/in.h> 19 #include <linux/ip.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/netdevice.h> 23 #include <linux/pci.h> 24 #include <linux/proc_fs.h> 25 #include <linux/skbuff.h> 26 #include <linux/slab.h> 27 #include <linux/tcp.h> 28 #include <linux/types.h> 29 #include <linux/wireless.h> 30 #include <linux/etherdevice.h> 31 #include <linux/uaccess.h> 32 #include <linux/if_vlan.h> 33 34 #include "rtllib.h" 35 36 /* 802.11 Data Frame 37 * 38 * 39 * 802.11 frame_control for data frames - 2 bytes 40 * ,--------------------------------------------------------------------. 41 * bits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | a | b | c | d | e | 42 * |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----| 43 * val | 0 | 0 | 0 | 1 | x | 0 | 0 | 0 | 1 | 0 | x | x | x | x | x | 44 * |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----| 45 * desc | ver | type | ^-subtype-^ |to |from|more|retry| pwr |more |wep | 46 * | | | x=0 data |DS | DS |frag| | mgm |data | | 47 * | | | x=1 data+ack | | | | | | | | 48 * '--------------------------------------------------------------------' 49 * /\ 50 * | 51 * 802.11 Data Frame | 52 * ,--------- 'ctrl' expands to >---' 53 * | 54 * ,--'---,-------------------------------------------------------------. 55 * Bytes | 2 | 2 | 6 | 6 | 6 | 2 | 0..2312 | 4 | 56 * |------|------|---------|---------|---------|------|---------|------| 57 * Desc. | ctrl | dura | DA/RA | TA | SA | Sequ | Frame | fcs | 58 * | | tion | (BSSID) | | | ence | data | | 59 * `--------------------------------------------------| |------' 60 * Total: 28 non-data bytes `----.----' 61 * | 62 * .- 'Frame data' expands to <---------------------------' 63 * | 64 * V 65 * ,---------------------------------------------------. 66 * Bytes | 1 | 1 | 1 | 3 | 2 | 0-2304 | 67 * |------|------|---------|----------|------|---------| 68 * Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP | 69 * | DSAP | SSAP | | | | Packet | 70 * | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8| | | 71 * `-----------------------------------------| | 72 * Total: 8 non-data bytes `----.----' 73 * | 74 * .- 'IP Packet' expands, if WEP enabled, to <--' 75 * | 76 * V 77 * ,-----------------------. 78 * Bytes | 4 | 0-2296 | 4 | 79 * |-----|-----------|-----| 80 * Desc. | IV | Encrypted | ICV | 81 * | | IP Packet | | 82 * `-----------------------' 83 * Total: 8 non-data bytes 84 * 85 * 86 * 802.3 Ethernet Data Frame 87 * 88 * ,-----------------------------------------. 89 * Bytes | 6 | 6 | 2 | Variable | 4 | 90 * |-------|-------|------|-----------|------| 91 * Desc. | Dest. | Source| Type | IP Packet | fcs | 92 * | MAC | MAC | | | | 93 * `-----------------------------------------' 94 * Total: 18 non-data bytes 95 * 96 * In the event that fragmentation is required, the incoming payload is split 97 * into N parts of size ieee->fts. The first fragment contains the SNAP header 98 * and the remaining packets are just data. 99 * 100 * If encryption is enabled, each fragment payload size is reduced by enough 101 * space to add the prefix and postfix (IV and ICV totalling 8 bytes in 102 * the case of WEP) So if you have 1500 bytes of payload with ieee->fts set to 103 * 500 without encryption it will take 3 frames. With WEP it will take 4 frames 104 * as the payload of each frame is reduced to 492 bytes. 105 * 106 * SKB visualization 107 * 108 * ,- skb->data 109 * | 110 * | ETHERNET HEADER ,-<-- PAYLOAD 111 * | | 14 bytes from skb->data 112 * | 2 bytes for Type --> ,T. | (sizeof ethhdr) 113 * | | | | 114 * |,-Dest.--. ,--Src.---. | | | 115 * | 6 bytes| | 6 bytes | | | | 116 * v | | | | | | 117 * 0 | v 1 | v | v 2 118 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 119 * ^ | ^ | ^ | 120 * | | | | | | 121 * | | | | `T' <---- 2 bytes for Type 122 * | | | | 123 * | | '---SNAP--' <-------- 6 bytes for SNAP 124 * | | 125 * `-IV--' <-------------------- 4 bytes for IV (WEP) 126 * 127 * SNAP HEADER 128 * 129 */ 130 131 static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 }; 132 static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 }; 133 134 static int rtllib_put_snap(u8 *data, u16 h_proto) 135 { 136 struct rtllib_snap_hdr *snap; 137 u8 *oui; 138 139 snap = (struct rtllib_snap_hdr *)data; 140 snap->dsap = 0xaa; 141 snap->ssap = 0xaa; 142 snap->ctrl = 0x03; 143 144 if (h_proto == 0x8137 || h_proto == 0x80f3) 145 oui = P802_1H_OUI; 146 else 147 oui = RFC1042_OUI; 148 snap->oui[0] = oui[0]; 149 snap->oui[1] = oui[1]; 150 snap->oui[2] = oui[2]; 151 152 *(__be16 *)(data + SNAP_SIZE) = htons(h_proto); 153 154 return SNAP_SIZE + sizeof(u16); 155 } 156 157 int rtllib_encrypt_fragment(struct rtllib_device *ieee, struct sk_buff *frag, 158 int hdr_len) 159 { 160 struct lib80211_crypt_data *crypt = NULL; 161 int res; 162 163 crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx]; 164 165 if (!(crypt && crypt->ops)) { 166 netdev_info(ieee->dev, "=========>%s(), crypt is null\n", 167 __func__); 168 return -1; 169 } 170 /* To encrypt, frame format is: 171 * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) 172 */ 173 174 /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so 175 * call both MSDU and MPDU encryption functions from here. 176 */ 177 atomic_inc(&crypt->refcnt); 178 res = 0; 179 if (crypt->ops->encrypt_msdu) 180 res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv); 181 if (res == 0 && crypt->ops->encrypt_mpdu) 182 res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv); 183 184 atomic_dec(&crypt->refcnt); 185 if (res < 0) { 186 netdev_info(ieee->dev, "%s: Encryption failed: len=%d.\n", 187 ieee->dev->name, frag->len); 188 return -1; 189 } 190 191 return 0; 192 } 193 194 void rtllib_txb_free(struct rtllib_txb *txb) 195 { 196 if (unlikely(!txb)) 197 return; 198 kfree(txb); 199 } 200 201 static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size, 202 gfp_t gfp_mask) 203 { 204 struct rtllib_txb *txb; 205 int i; 206 207 txb = kzalloc(struct_size(txb, fragments, nr_frags), gfp_mask); 208 if (!txb) 209 return NULL; 210 211 txb->nr_frags = nr_frags; 212 txb->frag_size = cpu_to_le16(txb_size); 213 214 for (i = 0; i < nr_frags; i++) { 215 txb->fragments[i] = dev_alloc_skb(txb_size); 216 if (unlikely(!txb->fragments[i])) 217 goto err_free; 218 memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb)); 219 } 220 221 return txb; 222 223 err_free: 224 while (--i >= 0) 225 dev_kfree_skb_any(txb->fragments[i]); 226 kfree(txb); 227 228 return NULL; 229 } 230 231 static int rtllib_classify(struct sk_buff *skb, u8 bIsAmsdu) 232 { 233 struct ethhdr *eth; 234 struct iphdr *ip; 235 236 eth = (struct ethhdr *)skb->data; 237 if (eth->h_proto != htons(ETH_P_IP)) 238 return 0; 239 240 #ifdef VERBOSE_DEBUG 241 print_hex_dump_bytes("%s: ", __func__, DUMP_PREFIX_NONE, skb->data, 242 skb->len); 243 #endif 244 ip = ip_hdr(skb); 245 switch (ip->tos & 0xfc) { 246 case 0x20: 247 return 2; 248 case 0x40: 249 return 1; 250 case 0x60: 251 return 3; 252 case 0x80: 253 return 4; 254 case 0xa0: 255 return 5; 256 case 0xc0: 257 return 6; 258 case 0xe0: 259 return 7; 260 default: 261 return 0; 262 } 263 } 264 265 static void rtllib_tx_query_agg_cap(struct rtllib_device *ieee, 266 struct sk_buff *skb, 267 struct cb_desc *tcb_desc) 268 { 269 struct rt_hi_throughput *ht_info = ieee->ht_info; 270 struct tx_ts_record *pTxTs = NULL; 271 struct rtllib_hdr_1addr *hdr = (struct rtllib_hdr_1addr *)skb->data; 272 273 if (rtllib_act_scanning(ieee, false)) 274 return; 275 276 if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht) 277 return; 278 if (!IsQoSDataFrame(skb->data)) 279 return; 280 if (is_multicast_ether_addr(hdr->addr1)) 281 return; 282 283 if (tcb_desc->bdhcp || ieee->CntAfterLink < 2) 284 return; 285 286 if (ht_info->iot_action & HT_IOT_ACT_TX_NO_AGGREGATION) 287 return; 288 289 if (!ieee->GetNmodeSupportBySecCfg(ieee->dev)) 290 return; 291 if (ht_info->bCurrentAMPDUEnable) { 292 if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1, 293 skb->priority, TX_DIR, true)) { 294 netdev_info(ieee->dev, "%s: can't get TS\n", __func__); 295 return; 296 } 297 if (!pTxTs->TxAdmittedBARecord.b_valid) { 298 if (ieee->wpa_ie_len && (ieee->pairwise_key_type == 299 KEY_TYPE_NA)) { 300 ; 301 } else if (tcb_desc->bdhcp == 1) { 302 ; 303 } else if (!pTxTs->bDisable_AddBa) { 304 TsStartAddBaProcess(ieee, pTxTs); 305 } 306 goto FORCED_AGG_SETTING; 307 } else if (!pTxTs->bUsingBa) { 308 if (SN_LESS(pTxTs->TxAdmittedBARecord.ba_start_seq_ctrl.field.seq_num, 309 (pTxTs->TxCurSeq + 1) % 4096)) 310 pTxTs->bUsingBa = true; 311 else 312 goto FORCED_AGG_SETTING; 313 } 314 if (ieee->iw_mode == IW_MODE_INFRA) { 315 tcb_desc->bAMPDUEnable = true; 316 tcb_desc->ampdu_factor = ht_info->CurrentAMPDUFactor; 317 tcb_desc->ampdu_density = ht_info->current_mpdu_density; 318 } 319 } 320 FORCED_AGG_SETTING: 321 switch (ht_info->ForcedAMPDUMode) { 322 case HT_AGG_AUTO: 323 break; 324 325 case HT_AGG_FORCE_ENABLE: 326 tcb_desc->bAMPDUEnable = true; 327 tcb_desc->ampdu_density = ht_info->forced_mpdu_density; 328 tcb_desc->ampdu_factor = ht_info->forced_ampdu_factor; 329 break; 330 331 case HT_AGG_FORCE_DISABLE: 332 tcb_desc->bAMPDUEnable = false; 333 tcb_desc->ampdu_density = 0; 334 tcb_desc->ampdu_factor = 0; 335 break; 336 } 337 } 338 339 static void rtllib_query_ShortPreambleMode(struct rtllib_device *ieee, 340 struct cb_desc *tcb_desc) 341 { 342 tcb_desc->bUseShortPreamble = false; 343 if (tcb_desc->data_rate == 2) 344 return; 345 else if (ieee->current_network.capability & 346 WLAN_CAPABILITY_SHORT_PREAMBLE) 347 tcb_desc->bUseShortPreamble = true; 348 } 349 350 static void rtllib_query_HTCapShortGI(struct rtllib_device *ieee, 351 struct cb_desc *tcb_desc) 352 { 353 struct rt_hi_throughput *ht_info = ieee->ht_info; 354 355 tcb_desc->bUseShortGI = false; 356 357 if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht) 358 return; 359 360 if (ht_info->forced_short_gi) { 361 tcb_desc->bUseShortGI = true; 362 return; 363 } 364 365 if (ht_info->bCurBW40MHz && ht_info->bCurShortGI40MHz) 366 tcb_desc->bUseShortGI = true; 367 else if (!ht_info->bCurBW40MHz && ht_info->bCurShortGI20MHz) 368 tcb_desc->bUseShortGI = true; 369 } 370 371 static void rtllib_query_BandwidthMode(struct rtllib_device *ieee, 372 struct cb_desc *tcb_desc) 373 { 374 struct rt_hi_throughput *ht_info = ieee->ht_info; 375 376 tcb_desc->bPacketBW = false; 377 378 if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht) 379 return; 380 381 if (tcb_desc->bMulticast || tcb_desc->bBroadcast) 382 return; 383 384 if ((tcb_desc->data_rate & 0x80) == 0) 385 return; 386 if (ht_info->bCurBW40MHz && ht_info->cur_tx_bw40mhz && 387 !ieee->bandwidth_auto_switch.bforced_tx20Mhz) 388 tcb_desc->bPacketBW = true; 389 } 390 391 static void rtllib_query_protectionmode(struct rtllib_device *ieee, 392 struct cb_desc *tcb_desc, 393 struct sk_buff *skb) 394 { 395 struct rt_hi_throughput *ht_info; 396 397 tcb_desc->bRTSSTBC = false; 398 tcb_desc->bRTSUseShortGI = false; 399 tcb_desc->bCTSEnable = false; 400 tcb_desc->RTSSC = 0; 401 tcb_desc->bRTSBW = false; 402 403 if (tcb_desc->bBroadcast || tcb_desc->bMulticast) 404 return; 405 406 if (is_broadcast_ether_addr(skb->data + 16)) 407 return; 408 409 if (ieee->mode < WIRELESS_MODE_N_24G) { 410 if (skb->len > ieee->rts) { 411 tcb_desc->bRTSEnable = true; 412 tcb_desc->rts_rate = MGN_24M; 413 } else if (ieee->current_network.buseprotection) { 414 tcb_desc->bRTSEnable = true; 415 tcb_desc->bCTSEnable = true; 416 tcb_desc->rts_rate = MGN_24M; 417 } 418 return; 419 } 420 421 ht_info = ieee->ht_info; 422 423 while (true) { 424 if (ht_info->iot_action & HT_IOT_ACT_FORCED_CTS2SELF) { 425 tcb_desc->bCTSEnable = true; 426 tcb_desc->rts_rate = MGN_24M; 427 tcb_desc->bRTSEnable = true; 428 break; 429 } else if (ht_info->iot_action & (HT_IOT_ACT_FORCED_RTS | 430 HT_IOT_ACT_PURE_N_MODE)) { 431 tcb_desc->bRTSEnable = true; 432 tcb_desc->rts_rate = MGN_24M; 433 break; 434 } 435 if (ieee->current_network.buseprotection) { 436 tcb_desc->bRTSEnable = true; 437 tcb_desc->bCTSEnable = true; 438 tcb_desc->rts_rate = MGN_24M; 439 break; 440 } 441 if (ht_info->bCurrentHTSupport && ht_info->enable_ht) { 442 u8 HTOpMode = ht_info->current_op_mode; 443 444 if ((ht_info->bCurBW40MHz && (HTOpMode == 2 || 445 HTOpMode == 3)) || 446 (!ht_info->bCurBW40MHz && HTOpMode == 3)) { 447 tcb_desc->rts_rate = MGN_24M; 448 tcb_desc->bRTSEnable = true; 449 break; 450 } 451 } 452 if (skb->len > ieee->rts) { 453 tcb_desc->rts_rate = MGN_24M; 454 tcb_desc->bRTSEnable = true; 455 break; 456 } 457 if (tcb_desc->bAMPDUEnable) { 458 tcb_desc->rts_rate = MGN_24M; 459 tcb_desc->bRTSEnable = false; 460 break; 461 } 462 goto NO_PROTECTION; 463 } 464 if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE) 465 tcb_desc->bUseShortPreamble = true; 466 if (ieee->iw_mode == IW_MODE_MASTER) 467 goto NO_PROTECTION; 468 return; 469 NO_PROTECTION: 470 tcb_desc->bRTSEnable = false; 471 tcb_desc->bCTSEnable = false; 472 tcb_desc->rts_rate = 0; 473 tcb_desc->RTSSC = 0; 474 tcb_desc->bRTSBW = false; 475 } 476 477 static void rtllib_txrate_selectmode(struct rtllib_device *ieee, 478 struct cb_desc *tcb_desc) 479 { 480 if (ieee->tx_dis_rate_fallback) 481 tcb_desc->tx_dis_rate_fallback = true; 482 483 if (ieee->tx_use_drv_assinged_rate) 484 tcb_desc->tx_use_drv_assinged_rate = true; 485 if (!tcb_desc->tx_dis_rate_fallback || 486 !tcb_desc->tx_use_drv_assinged_rate) { 487 if (ieee->iw_mode == IW_MODE_INFRA || 488 ieee->iw_mode == IW_MODE_ADHOC) 489 tcb_desc->ratr_index = 0; 490 } 491 } 492 493 static u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb, 494 u8 *dst) 495 { 496 u16 seqnum = 0; 497 498 if (is_multicast_ether_addr(dst)) 499 return 0; 500 if (IsQoSDataFrame(skb->data)) { 501 struct tx_ts_record *pTS = NULL; 502 503 if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst, 504 skb->priority, TX_DIR, true)) 505 return 0; 506 seqnum = pTS->TxCurSeq; 507 pTS->TxCurSeq = (pTS->TxCurSeq + 1) % 4096; 508 return seqnum; 509 } 510 return 0; 511 } 512 513 static int wme_downgrade_ac(struct sk_buff *skb) 514 { 515 switch (skb->priority) { 516 case 6: 517 case 7: 518 skb->priority = 5; /* VO -> VI */ 519 return 0; 520 case 4: 521 case 5: 522 skb->priority = 3; /* VI -> BE */ 523 return 0; 524 case 0: 525 case 3: 526 skb->priority = 1; /* BE -> BK */ 527 return 0; 528 default: 529 return -1; 530 } 531 } 532 533 static u8 rtllib_current_rate(struct rtllib_device *ieee) 534 { 535 if (ieee->mode & IEEE_MODE_MASK) 536 return ieee->rate; 537 538 if (ieee->HTCurrentOperaRate) 539 return ieee->HTCurrentOperaRate; 540 else 541 return ieee->rate & 0x7F; 542 } 543 544 static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev) 545 { 546 struct rtllib_device *ieee = (struct rtllib_device *) 547 netdev_priv_rsl(dev); 548 struct rtllib_txb *txb = NULL; 549 struct rtllib_hdr_3addrqos *frag_hdr; 550 int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size; 551 unsigned long flags; 552 struct net_device_stats *stats = &ieee->stats; 553 int ether_type = 0, encrypt; 554 int bytes, fc, qos_ctl = 0, hdr_len; 555 struct sk_buff *skb_frag; 556 struct rtllib_hdr_3addrqos header = { /* Ensure zero initialized */ 557 .duration_id = 0, 558 .seq_ctl = 0, 559 .qos_ctl = 0 560 }; 561 int qos_activated = ieee->current_network.qos_data.active; 562 u8 dest[ETH_ALEN]; 563 u8 src[ETH_ALEN]; 564 struct lib80211_crypt_data *crypt = NULL; 565 struct cb_desc *tcb_desc; 566 u8 bIsMulticast = false; 567 u8 IsAmsdu = false; 568 bool bdhcp = false; 569 570 spin_lock_irqsave(&ieee->lock, flags); 571 572 /* If there is no driver handler to take the TXB, don't bother 573 * creating it... 574 */ 575 if (!(ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) || 576 ((!ieee->softmac_data_hard_start_xmit && 577 (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) { 578 netdev_warn(ieee->dev, "No xmit handler.\n"); 579 goto success; 580 } 581 582 if (likely(ieee->raw_tx == 0)) { 583 if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) { 584 netdev_warn(ieee->dev, "skb too small (%d).\n", 585 skb->len); 586 goto success; 587 } 588 /* Save source and destination addresses */ 589 ether_addr_copy(dest, skb->data); 590 ether_addr_copy(src, skb->data + ETH_ALEN); 591 592 memset(skb->cb, 0, sizeof(skb->cb)); 593 ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto); 594 595 if (ieee->iw_mode == IW_MODE_MONITOR) { 596 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC); 597 if (unlikely(!txb)) { 598 netdev_warn(ieee->dev, 599 "Could not allocate TXB\n"); 600 goto failed; 601 } 602 603 txb->encrypted = 0; 604 txb->payload_size = cpu_to_le16(skb->len); 605 skb_put_data(txb->fragments[0], skb->data, skb->len); 606 607 goto success; 608 } 609 610 if (skb->len > 282) { 611 if (ether_type == ETH_P_IP) { 612 const struct iphdr *ip = (struct iphdr *) 613 ((u8 *)skb->data + 14); 614 if (ip->protocol == IPPROTO_UDP) { 615 struct udphdr *udp; 616 617 udp = (struct udphdr *)((u8 *)ip + 618 (ip->ihl << 2)); 619 if (((((u8 *)udp)[1] == 68) && 620 (((u8 *)udp)[3] == 67)) || 621 ((((u8 *)udp)[1] == 67) && 622 (((u8 *)udp)[3] == 68))) { 623 bdhcp = true; 624 ieee->LPSDelayCnt = 200; 625 } 626 } 627 } else if (ether_type == ETH_P_ARP) { 628 netdev_info(ieee->dev, 629 "=================>DHCP Protocol start tx ARP pkt!!\n"); 630 bdhcp = true; 631 ieee->LPSDelayCnt = 632 ieee->current_network.tim.tim_count; 633 } 634 } 635 636 skb->priority = rtllib_classify(skb, IsAmsdu); 637 crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx]; 638 encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) && 639 ieee->host_encrypt && crypt && crypt->ops; 640 if (!encrypt && ieee->ieee802_1x && 641 ieee->drop_unencrypted && ether_type != ETH_P_PAE) { 642 stats->tx_dropped++; 643 goto success; 644 } 645 if (crypt && !encrypt && ether_type == ETH_P_PAE) { 646 struct eapol *eap = (struct eapol *)(skb->data + 647 sizeof(struct ethhdr) - SNAP_SIZE - 648 sizeof(u16)); 649 netdev_dbg(ieee->dev, 650 "TX: IEEE 802.11 EAPOL frame: %s\n", 651 eap_get_type(eap->type)); 652 } 653 654 /* Advance the SKB to the start of the payload */ 655 skb_pull(skb, sizeof(struct ethhdr)); 656 657 /* Determine total amount of storage required for TXB packets */ 658 bytes = skb->len + SNAP_SIZE + sizeof(u16); 659 660 if (encrypt) 661 fc = RTLLIB_FTYPE_DATA | RTLLIB_FCTL_WEP; 662 else 663 fc = RTLLIB_FTYPE_DATA; 664 665 if (qos_activated) 666 fc |= RTLLIB_STYPE_QOS_DATA; 667 else 668 fc |= RTLLIB_STYPE_DATA; 669 670 if (ieee->iw_mode == IW_MODE_INFRA) { 671 fc |= RTLLIB_FCTL_TODS; 672 /* To DS: Addr1 = BSSID, Addr2 = SA, 673 * Addr3 = DA 674 */ 675 ether_addr_copy(header.addr1, 676 ieee->current_network.bssid); 677 ether_addr_copy(header.addr2, src); 678 if (IsAmsdu) 679 ether_addr_copy(header.addr3, 680 ieee->current_network.bssid); 681 else 682 ether_addr_copy(header.addr3, dest); 683 } else if (ieee->iw_mode == IW_MODE_ADHOC) { 684 /* not From/To DS: Addr1 = DA, Addr2 = SA, 685 * Addr3 = BSSID 686 */ 687 ether_addr_copy(header.addr1, dest); 688 ether_addr_copy(header.addr2, src); 689 ether_addr_copy(header.addr3, 690 ieee->current_network.bssid); 691 } 692 693 bIsMulticast = is_multicast_ether_addr(header.addr1); 694 695 header.frame_ctl = cpu_to_le16(fc); 696 697 /* Determine fragmentation size based on destination (multicast 698 * and broadcast are not fragmented) 699 */ 700 if (bIsMulticast) { 701 frag_size = MAX_FRAG_THRESHOLD; 702 qos_ctl |= QOS_CTL_NOTCONTAIN_ACK; 703 } else { 704 frag_size = ieee->fts; 705 qos_ctl = 0; 706 } 707 708 if (qos_activated) { 709 hdr_len = RTLLIB_3ADDR_LEN + 2; 710 711 /* in case we are a client verify acm is not set for this ac */ 712 while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) { 713 netdev_info(ieee->dev, "skb->priority = %x\n", 714 skb->priority); 715 if (wme_downgrade_ac(skb)) 716 break; 717 netdev_info(ieee->dev, "converted skb->priority = %x\n", 718 skb->priority); 719 } 720 721 qos_ctl |= skb->priority; 722 header.qos_ctl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID); 723 724 } else { 725 hdr_len = RTLLIB_3ADDR_LEN; 726 } 727 /* Determine amount of payload per fragment. Regardless of if 728 * this stack is providing the full 802.11 header, one will 729 * eventually be affixed to this fragment -- so we must account 730 * for it when determining the amount of payload space. 731 */ 732 bytes_per_frag = frag_size - hdr_len; 733 if (ieee->config & 734 (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS)) 735 bytes_per_frag -= RTLLIB_FCS_LEN; 736 737 /* Each fragment may need to have room for encrypting 738 * pre/postfix 739 */ 740 if (encrypt) { 741 bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len + 742 crypt->ops->extra_mpdu_postfix_len + 743 crypt->ops->extra_msdu_prefix_len + 744 crypt->ops->extra_msdu_postfix_len; 745 } 746 /* Number of fragments is the total bytes_per_frag / 747 * payload_per_fragment 748 */ 749 nr_frags = bytes / bytes_per_frag; 750 bytes_last_frag = bytes % bytes_per_frag; 751 if (bytes_last_frag) 752 nr_frags++; 753 else 754 bytes_last_frag = bytes_per_frag; 755 756 /* When we allocate the TXB we allocate enough space for the 757 * reserve and full fragment bytes (bytes_per_frag doesn't 758 * include prefix, postfix, header, FCS, etc.) 759 */ 760 txb = rtllib_alloc_txb(nr_frags, frag_size + 761 ieee->tx_headroom, GFP_ATOMIC); 762 if (unlikely(!txb)) { 763 netdev_warn(ieee->dev, "Could not allocate TXB\n"); 764 goto failed; 765 } 766 txb->encrypted = encrypt; 767 txb->payload_size = cpu_to_le16(bytes); 768 769 if (qos_activated) 770 txb->queue_index = UP2AC(skb->priority); 771 else 772 txb->queue_index = WME_AC_BE; 773 774 for (i = 0; i < nr_frags; i++) { 775 skb_frag = txb->fragments[i]; 776 tcb_desc = (struct cb_desc *)(skb_frag->cb + 777 MAX_DEV_ADDR_SIZE); 778 if (qos_activated) { 779 skb_frag->priority = skb->priority; 780 tcb_desc->queue_index = UP2AC(skb->priority); 781 } else { 782 skb_frag->priority = WME_AC_BE; 783 tcb_desc->queue_index = WME_AC_BE; 784 } 785 skb_reserve(skb_frag, ieee->tx_headroom); 786 787 if (encrypt) { 788 if (ieee->hwsec_active) 789 tcb_desc->bHwSec = 1; 790 else 791 tcb_desc->bHwSec = 0; 792 skb_reserve(skb_frag, 793 crypt->ops->extra_mpdu_prefix_len + 794 crypt->ops->extra_msdu_prefix_len); 795 } else { 796 tcb_desc->bHwSec = 0; 797 } 798 frag_hdr = skb_put_data(skb_frag, &header, hdr_len); 799 800 /* If this is not the last fragment, then add the 801 * MOREFRAGS bit to the frame control 802 */ 803 if (i != nr_frags - 1) { 804 frag_hdr->frame_ctl = cpu_to_le16(fc | 805 RTLLIB_FCTL_MOREFRAGS); 806 bytes = bytes_per_frag; 807 808 } else { 809 /* The last fragment has the remaining length */ 810 bytes = bytes_last_frag; 811 } 812 if ((qos_activated) && (!bIsMulticast)) { 813 frag_hdr->seq_ctl = 814 cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag, 815 header.addr1)); 816 frag_hdr->seq_ctl = 817 cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctl) << 4 | i); 818 } else { 819 frag_hdr->seq_ctl = 820 cpu_to_le16(ieee->seq_ctrl[0] << 4 | i); 821 } 822 /* Put a SNAP header on the first fragment */ 823 if (i == 0) { 824 rtllib_put_snap(skb_put(skb_frag, 825 SNAP_SIZE + 826 sizeof(u16)), ether_type); 827 bytes -= SNAP_SIZE + sizeof(u16); 828 } 829 830 skb_put_data(skb_frag, skb->data, bytes); 831 832 /* Advance the SKB... */ 833 skb_pull(skb, bytes); 834 835 /* Encryption routine will move the header forward in 836 * order to insert the IV between the header and the 837 * payload 838 */ 839 if (encrypt) 840 rtllib_encrypt_fragment(ieee, skb_frag, 841 hdr_len); 842 if (ieee->config & 843 (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS)) 844 skb_put(skb_frag, 4); 845 } 846 847 if ((qos_activated) && (!bIsMulticast)) { 848 if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF) 849 ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0; 850 else 851 ieee->seq_ctrl[UP2AC(skb->priority) + 1]++; 852 } else { 853 if (ieee->seq_ctrl[0] == 0xFFF) 854 ieee->seq_ctrl[0] = 0; 855 else 856 ieee->seq_ctrl[0]++; 857 } 858 } else { 859 if (unlikely(skb->len < sizeof(struct rtllib_hdr_3addr))) { 860 netdev_warn(ieee->dev, "skb too small (%d).\n", 861 skb->len); 862 goto success; 863 } 864 865 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC); 866 if (!txb) { 867 netdev_warn(ieee->dev, "Could not allocate TXB\n"); 868 goto failed; 869 } 870 871 txb->encrypted = 0; 872 txb->payload_size = cpu_to_le16(skb->len); 873 skb_put_data(txb->fragments[0], skb->data, skb->len); 874 } 875 876 success: 877 if (txb) { 878 tcb_desc = (struct cb_desc *) 879 (txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE); 880 tcb_desc->bTxEnableFwCalcDur = 1; 881 tcb_desc->priority = skb->priority; 882 883 if (ether_type == ETH_P_PAE) { 884 if (ieee->ht_info->iot_action & 885 HT_IOT_ACT_WA_IOT_Broadcom) { 886 tcb_desc->data_rate = 887 MgntQuery_TxRateExcludeCCKRates(ieee); 888 tcb_desc->tx_dis_rate_fallback = false; 889 } else { 890 tcb_desc->data_rate = ieee->basic_rate; 891 tcb_desc->tx_dis_rate_fallback = 1; 892 } 893 894 tcb_desc->ratr_index = 7; 895 tcb_desc->tx_use_drv_assinged_rate = 1; 896 } else { 897 if (is_multicast_ether_addr(header.addr1)) 898 tcb_desc->bMulticast = 1; 899 if (is_broadcast_ether_addr(header.addr1)) 900 tcb_desc->bBroadcast = 1; 901 rtllib_txrate_selectmode(ieee, tcb_desc); 902 if (tcb_desc->bMulticast || tcb_desc->bBroadcast) 903 tcb_desc->data_rate = ieee->basic_rate; 904 else 905 tcb_desc->data_rate = rtllib_current_rate(ieee); 906 907 if (bdhcp) { 908 if (ieee->ht_info->iot_action & 909 HT_IOT_ACT_WA_IOT_Broadcom) { 910 tcb_desc->data_rate = 911 MgntQuery_TxRateExcludeCCKRates(ieee); 912 tcb_desc->tx_dis_rate_fallback = false; 913 } else { 914 tcb_desc->data_rate = MGN_1M; 915 tcb_desc->tx_dis_rate_fallback = 1; 916 } 917 918 tcb_desc->ratr_index = 7; 919 tcb_desc->tx_use_drv_assinged_rate = 1; 920 tcb_desc->bdhcp = 1; 921 } 922 923 rtllib_query_ShortPreambleMode(ieee, tcb_desc); 924 rtllib_tx_query_agg_cap(ieee, txb->fragments[0], 925 tcb_desc); 926 rtllib_query_HTCapShortGI(ieee, tcb_desc); 927 rtllib_query_BandwidthMode(ieee, tcb_desc); 928 rtllib_query_protectionmode(ieee, tcb_desc, 929 txb->fragments[0]); 930 } 931 } 932 spin_unlock_irqrestore(&ieee->lock, flags); 933 dev_kfree_skb_any(skb); 934 if (txb) { 935 if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) { 936 dev->stats.tx_packets++; 937 dev->stats.tx_bytes += le16_to_cpu(txb->payload_size); 938 rtllib_softmac_xmit(txb, ieee); 939 } else { 940 rtllib_txb_free(txb); 941 } 942 } 943 944 return 0; 945 946 failed: 947 spin_unlock_irqrestore(&ieee->lock, flags); 948 netif_stop_queue(dev); 949 stats->tx_errors++; 950 return 1; 951 } 952 953 netdev_tx_t rtllib_xmit(struct sk_buff *skb, struct net_device *dev) 954 { 955 memset(skb->cb, 0, sizeof(skb->cb)); 956 return rtllib_xmit_inter(skb, dev) ? NETDEV_TX_BUSY : NETDEV_TX_OK; 957 } 958 EXPORT_SYMBOL(rtllib_xmit); 959