drivers/staging/rtl8192e/rtllib_rx.c

   1 /*
   2  * Original code based Host AP (software wireless LAN access point) driver
   3  * for Intersil Prism2/2.5/3 - hostap.o module, common routines
   4  *
   5  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   6  * <jkmaline@cc.hut.fi>
   7  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   8  * Copyright (c) 2004, Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation. See README and COPYING for
  13  * more details.
  14  ******************************************************************************
  15
  16   Few modifications for Realtek's Wi-Fi drivers by
  17   Andrea Merello <andrea.merello@gmail.com>
  18
  19   A special thanks goes to Realtek for their support !
  20
  21 ******************************************************************************/
  22
  23
  24 #include <linux/compiler.h>
  25 #include <linux/errno.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/in6.h>
  28 #include <linux/in.h>
  29 #include <linux/ip.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/pci.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/slab.h>
  37 #include <linux/tcp.h>
  38 #include <linux/types.h>
  39 #include <linux/wireless.h>
  40 #include <linux/etherdevice.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/ctype.h>
  43
  44 #include "rtllib.h"
  45 #include "dot11d.h"
  46
  47 static void rtllib_rx_mgt(struct rtllib_device *ieee, struct sk_buff *skb,
  48                           struct rtllib_rx_stats *stats);
  49
  50 static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
  51                                      struct sk_buff *skb,
  52                                      struct rtllib_rx_stats *rx_status,
  53                                      size_t hdr_length)
  54 {
  55         skb->dev = ieee->dev;
  56         skb_reset_mac_header(skb);
  57         skb_pull(skb, hdr_length);
  58         skb->pkt_type = PACKET_OTHERHOST;
  59         skb->protocol = htons(ETH_P_80211_RAW);
  60         memset(skb->cb, 0, sizeof(skb->cb));
  61         netif_rx(skb);
  62 }
  63
  64 /* Called only as a tasklet (software IRQ) */
  65 static struct rtllib_frag_entry *
  66 rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
  67                           unsigned int frag, u8 tid, u8 *src, u8 *dst)
  68 {
  69         struct rtllib_frag_entry *entry;
  70         int i;
  71
  72         for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
  73                 entry = &ieee->frag_cache[tid][i];
  74                 if (entry->skb != NULL &&
  75                     time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
  76                         netdev_dbg(ieee->dev,
  77                                    "expiring fragment cache entry seq=%u last_frag=%u\n",
  78                                    entry->seq, entry->last_frag);
  79                         dev_kfree_skb_any(entry->skb);
  80                         entry->skb = NULL;
  81                 }
  82
  83                 if (entry->skb != NULL && entry->seq == seq &&
  84                     (entry->last_frag + 1 == frag || frag == -1) &&
  85                     memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
  86                     memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
  87                         return entry;
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /* Called only as a tasklet (software IRQ) */
  94 static struct sk_buff *
  95 rtllib_frag_cache_get(struct rtllib_device *ieee,
  96                          struct rtllib_hdr_4addr *hdr)
  97 {
  98         struct sk_buff *skb = NULL;
  99         u16 fc = le16_to_cpu(hdr->frame_ctl);
 100         u16 sc = le16_to_cpu(hdr->seq_ctl);
 101         unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
 102         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
 103         struct rtllib_frag_entry *entry;
 104         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 105         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 106         u8 tid;
 107
 108         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 109             RTLLIB_QOS_HAS_SEQ(fc)) {
 110                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
 111                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 112                 tid = UP2AC(tid);
 113                 tid++;
 114         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 115                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
 116                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 117                 tid = UP2AC(tid);
 118                 tid++;
 119         } else {
 120                 tid = 0;
 121         }
 122
 123         if (frag == 0) {
 124                 /* Reserve enough space to fit maximum frame length */
 125                 skb = dev_alloc_skb(ieee->dev->mtu +
 126                                     sizeof(struct rtllib_hdr_4addr) +
 127                                     8 /* LLC */ +
 128                                     2 /* alignment */ +
 129                                     8 /* WEP */ +
 130                                     ETH_ALEN /* WDS */ +
 131                                     /* QOS Control */
 132                                     (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0));
 133                 if (!skb)
 134                         return NULL;
 135
 136                 entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
 137                 ieee->frag_next_idx[tid]++;
 138                 if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
 139                         ieee->frag_next_idx[tid] = 0;
 140
 141                 if (entry->skb != NULL)
 142                         dev_kfree_skb_any(entry->skb);
 143
 144                 entry->first_frag_time = jiffies;
 145                 entry->seq = seq;
 146                 entry->last_frag = frag;
 147                 entry->skb = skb;
 148                 ether_addr_copy(entry->src_addr, hdr->addr2);
 149                 ether_addr_copy(entry->dst_addr, hdr->addr1);
 150         } else {
 151                 /* received a fragment of a frame for which the head fragment
 152                  * should have already been received
 153                  */
 154                 entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
 155                                                   hdr->addr1);
 156                 if (entry != NULL) {
 157                         entry->last_frag = frag;
 158                         skb = entry->skb;
 159                 }
 160         }
 161
 162         return skb;
 163 }
 164
 165
 166 /* Called only as a tasklet (software IRQ) */
 167 static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
 168                                            struct rtllib_hdr_4addr *hdr)
 169 {
 170         u16 fc = le16_to_cpu(hdr->frame_ctl);
 171         u16 sc = le16_to_cpu(hdr->seq_ctl);
 172         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
 173         struct rtllib_frag_entry *entry;
 174         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 175         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 176         u8 tid;
 177
 178         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 179             RTLLIB_QOS_HAS_SEQ(fc)) {
 180                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
 181                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 182                 tid = UP2AC(tid);
 183                 tid++;
 184         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 185                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
 186                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 187                 tid = UP2AC(tid);
 188                 tid++;
 189         } else {
 190                 tid = 0;
 191         }
 192
 193         entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
 194                                           hdr->addr1);
 195
 196         if (entry == NULL) {
 197                 netdev_dbg(ieee->dev,
 198                            "Couldn't invalidate fragment cache entry (seq=%u)\n",
 199                            seq);
 200                 return -1;
 201         }
 202
 203         entry->skb = NULL;
 204         return 0;
 205 }
 206
 207 /* rtllib_rx_frame_mgtmt
 208  *
 209  * Responsible for handling management control frames
 210  *
 211  * Called by rtllib_rx
 212  */
 213 static inline int
 214 rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
 215                         struct rtllib_rx_stats *rx_stats, u16 type,
 216                         u16 stype)
 217 {
 218         /* On the struct stats definition there is written that
 219          * this is not mandatory.... but seems that the probe
 220          * response parser uses it
 221          */
 222         struct rtllib_hdr_3addr *hdr = (struct rtllib_hdr_3addr *)skb->data;
 223
 224         rx_stats->len = skb->len;
 225         rtllib_rx_mgt(ieee, skb, rx_stats);
 226         if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
 227                 dev_kfree_skb_any(skb);
 228                 return 0;
 229         }
 230         rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
 231
 232         dev_kfree_skb_any(skb);
 233
 234         return 0;
 235 }
 236
 237 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation
 238  * Ethernet-II snap header (RFC1042 for most EtherTypes)
 239  */
 240 static unsigned char rfc1042_header[] = {
 241         0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
 242 };
 243 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 244 static unsigned char bridge_tunnel_header[] = {
 245         0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
 246 };
 247 /* No encapsulation header if EtherType < 0x600 (=length) */
 248
 249 /* Called by rtllib_rx_frame_decrypt */
 250 static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
 251                                     struct sk_buff *skb, size_t hdrlen)
 252 {
 253         struct net_device *dev = ieee->dev;
 254         u16 fc, ethertype;
 255         struct rtllib_hdr_4addr *hdr;
 256         u8 *pos;
 257
 258         if (skb->len < 24)
 259                 return 0;
 260
 261         hdr = (struct rtllib_hdr_4addr *) skb->data;
 262         fc = le16_to_cpu(hdr->frame_ctl);
 263
 264         /* check that the frame is unicast frame to us */
 265         if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 266             RTLLIB_FCTL_TODS &&
 267             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
 268             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
 269                 /* ToDS frame with own addr BSSID and DA */
 270         } else if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 271                    RTLLIB_FCTL_FROMDS &&
 272                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
 273                 /* FromDS frame with own addr as DA */
 274         } else
 275                 return 0;
 276
 277         if (skb->len < 24 + 8)
 278                 return 0;
 279
 280         /* check for port access entity Ethernet type */
 281         pos = skb->data + hdrlen;
 282         ethertype = (pos[6] << 8) | pos[7];
 283         if (ethertype == ETH_P_PAE)
 284                 return 1;
 285
 286         return 0;
 287 }
 288
 289 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 290 static inline int
 291 rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
 292                         struct lib80211_crypt_data *crypt)
 293 {
 294         struct rtllib_hdr_4addr *hdr;
 295         int res, hdrlen;
 296
 297         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 298                 return 0;
 299
 300         if (ieee->hwsec_active) {
 301                 struct cb_desc *tcb_desc = (struct cb_desc *)
 302                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 303
 304                 tcb_desc->bHwSec = 1;
 305
 306                 if (ieee->need_sw_enc)
 307                         tcb_desc->bHwSec = 0;
 308         }
 309
 310         hdr = (struct rtllib_hdr_4addr *) skb->data;
 311         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 312
 313         atomic_inc(&crypt->refcnt);
 314         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 315         atomic_dec(&crypt->refcnt);
 316         if (res < 0) {
 317                 netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
 318                            hdr->addr2, res);
 319                 if (res == -2)
 320                         netdev_dbg(ieee->dev,
 321                                    "Decryption failed ICV mismatch (key %d)\n",
 322                                    skb->data[hdrlen + 3] >> 6);
 323                 return -1;
 324         }
 325
 326         return res;
 327 }
 328
 329
 330 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 331 static inline int
 332 rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
 333                              int keyidx, struct lib80211_crypt_data *crypt)
 334 {
 335         struct rtllib_hdr_4addr *hdr;
 336         int res, hdrlen;
 337
 338         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 339                 return 0;
 340         if (ieee->hwsec_active) {
 341                 struct cb_desc *tcb_desc = (struct cb_desc *)
 342                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 343
 344                 tcb_desc->bHwSec = 1;
 345
 346                 if (ieee->need_sw_enc)
 347                         tcb_desc->bHwSec = 0;
 348         }
 349
 350         hdr = (struct rtllib_hdr_4addr *) skb->data;
 351         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 352
 353         atomic_inc(&crypt->refcnt);
 354         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 355         atomic_dec(&crypt->refcnt);
 356         if (res < 0) {
 357                 netdev_dbg(ieee->dev,
 358                            "MSDU decryption/MIC verification failed (SA= %pM keyidx=%d)\n",
 359                            hdr->addr2, keyidx);
 360                 return -1;
 361         }
 362
 363         return 0;
 364 }
 365
 366
 367 /* this function is stolen from ipw2200 driver*/
 368 #define IEEE_PACKET_RETRY_TIME (5*HZ)
 369 static int is_duplicate_packet(struct rtllib_device *ieee,
 370                                       struct rtllib_hdr_4addr *header)
 371 {
 372         u16 fc = le16_to_cpu(header->frame_ctl);
 373         u16 sc = le16_to_cpu(header->seq_ctl);
 374         u16 seq = WLAN_GET_SEQ_SEQ(sc);
 375         u16 frag = WLAN_GET_SEQ_FRAG(sc);
 376         u16 *last_seq, *last_frag;
 377         unsigned long *last_time;
 378         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 379         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 380         u8 tid;
 381
 382         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 383             RTLLIB_QOS_HAS_SEQ(fc)) {
 384                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)header;
 385                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 386                 tid = UP2AC(tid);
 387                 tid++;
 388         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 389                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)header;
 390                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 391                 tid = UP2AC(tid);
 392                 tid++;
 393         } else {
 394                 tid = 0;
 395         }
 396
 397         switch (ieee->iw_mode) {
 398         case IW_MODE_ADHOC:
 399         {
 400                 struct list_head *p;
 401                 struct ieee_ibss_seq *entry = NULL;
 402                 u8 *mac = header->addr2;
 403                 int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
 404
 405                 list_for_each(p, &ieee->ibss_mac_hash[index]) {
 406                         entry = list_entry(p, struct ieee_ibss_seq, list);
 407                         if (!memcmp(entry->mac, mac, ETH_ALEN))
 408                                 break;
 409                 }
 410                 if (p == &ieee->ibss_mac_hash[index]) {
 411                         entry = kmalloc(sizeof(struct ieee_ibss_seq),
 412                                         GFP_ATOMIC);
 413                         if (!entry)
 414                                 return 0;
 415
 416                         ether_addr_copy(entry->mac, mac);
 417                         entry->seq_num[tid] = seq;
 418                         entry->frag_num[tid] = frag;
 419                         entry->packet_time[tid] = jiffies;
 420                         list_add(&entry->list, &ieee->ibss_mac_hash[index]);
 421                         return 0;
 422                 }
 423                 last_seq = &entry->seq_num[tid];
 424                 last_frag = &entry->frag_num[tid];
 425                 last_time = &entry->packet_time[tid];
 426                 break;
 427         }
 428
 429         case IW_MODE_INFRA:
 430                 last_seq = &ieee->last_rxseq_num[tid];
 431                 last_frag = &ieee->last_rxfrag_num[tid];
 432                 last_time = &ieee->last_packet_time[tid];
 433                 break;
 434         default:
 435                 return 0;
 436         }
 437
 438         if ((*last_seq == seq) &&
 439             time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
 440                 if (*last_frag == frag)
 441                         goto drop;
 442                 if (*last_frag + 1 != frag)
 443                         /* out-of-order fragment */
 444                         goto drop;
 445         } else
 446                 *last_seq = seq;
 447
 448         *last_frag = frag;
 449         *last_time = jiffies;
 450         return 0;
 451
 452 drop:
 453
 454         return 1;
 455 }
 456
 457 static bool AddReorderEntry(struct rx_ts_record *pTS,
 458                             struct rx_reorder_entry *pReorderEntry)
 459 {
 460         struct list_head *pList = &pTS->RxPendingPktList;
 461
 462         while (pList->next != &pTS->RxPendingPktList) {
 463                 if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
 464                     list_entry(pList->next, struct rx_reorder_entry,
 465                     List))->SeqNum))
 466                         pList = pList->next;
 467                 else if (SN_EQUAL(pReorderEntry->SeqNum,
 468                         ((struct rx_reorder_entry *)list_entry(pList->next,
 469                         struct rx_reorder_entry, List))->SeqNum))
 470                         return false;
 471                 else
 472                         break;
 473         }
 474         pReorderEntry->List.next = pList->next;
 475         pReorderEntry->List.next->prev = &pReorderEntry->List;
 476         pReorderEntry->List.prev = pList;
 477         pList->next = &pReorderEntry->List;
 478
 479         return true;
 480 }
 481
 482 void rtllib_indicate_packets(struct rtllib_device *ieee,
 483                              struct rtllib_rxb **prxbIndicateArray, u8 index)
 484 {
 485         struct net_device_stats *stats = &ieee->stats;
 486         u8 i = 0, j = 0;
 487         u16 ethertype;
 488
 489         for (j = 0; j < index; j++) {
 490                 struct rtllib_rxb *prxb = prxbIndicateArray[j];
 491
 492                 for (i = 0; i < prxb->nr_subframes; i++) {
 493                         struct sk_buff *sub_skb = prxb->subframes[i];
 494
 495                 /* convert hdr + possible LLC headers into Ethernet header */
 496                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
 497                         if (sub_skb->len >= 8 &&
 498                             ((memcmp(sub_skb->data, rfc1042_header,
 499                                      SNAP_SIZE) == 0 &&
 500                               ethertype != ETH_P_AARP &&
 501                               ethertype != ETH_P_IPX) ||
 502                             memcmp(sub_skb->data, bridge_tunnel_header,
 503                                    SNAP_SIZE) == 0)) {
 504                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
 505                                  * and replace EtherType
 506                                  */
 507                                 skb_pull(sub_skb, SNAP_SIZE);
 508                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 509                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 510                         } else {
 511                                 u16 len;
 512                         /* Leave Ethernet header part of hdr and full payload */
 513                                 len = sub_skb->len;
 514                                 memcpy(skb_push(sub_skb, 2), &len, 2);
 515                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 516                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 517                         }
 518
 519                         /* Indicate the packets to upper layer */
 520                         if (sub_skb) {
 521                                 stats->rx_packets++;
 522                                 stats->rx_bytes += sub_skb->len;
 523
 524                                 memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
 525                                 sub_skb->protocol = eth_type_trans(sub_skb,
 526                                                                    ieee->dev);
 527                                 sub_skb->dev = ieee->dev;
 528                                 sub_skb->dev->stats.rx_packets++;
 529                                 sub_skb->dev->stats.rx_bytes += sub_skb->len;
 530                                 /* 802.11 crc not sufficient */
 531                                 sub_skb->ip_summed = CHECKSUM_NONE;
 532                                 ieee->last_rx_ps_time = jiffies;
 533                                 netif_rx(sub_skb);
 534                         }
 535                 }
 536                 kfree(prxb);
 537                 prxb = NULL;
 538         }
 539 }
 540
 541 void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee,
 542                                  struct rx_ts_record *pTS)
 543 {
 544         struct rx_reorder_entry *pRxReorderEntry;
 545         u8 RfdCnt = 0;
 546
 547         del_timer_sync(&pTS->RxPktPendingTimer);
 548         while (!list_empty(&pTS->RxPendingPktList)) {
 549                 if (RfdCnt >= REORDER_WIN_SIZE) {
 550                         netdev_info(ieee->dev,
 551                                     "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n",
 552                                     __func__);
 553                         break;
 554                 }
 555
 556                 pRxReorderEntry = (struct rx_reorder_entry *)
 557                                   list_entry(pTS->RxPendingPktList.prev,
 558                                              struct rx_reorder_entry, List);
 559                 netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n", __func__,
 560                            pRxReorderEntry->SeqNum);
 561                 list_del_init(&pRxReorderEntry->List);
 562
 563                 ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
 564
 565                 RfdCnt = RfdCnt + 1;
 566                 list_add_tail(&pRxReorderEntry->List,
 567                               &ieee->RxReorder_Unused_List);
 568         }
 569         rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
 570
 571         pTS->RxIndicateSeq = 0xffff;
 572 }
 573
 574 static void RxReorderIndicatePacket(struct rtllib_device *ieee,
 575                                     struct rtllib_rxb *prxb,
 576                                     struct rx_ts_record *pTS, u16 SeqNum)
 577 {
 578         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 579         struct rx_reorder_entry *pReorderEntry = NULL;
 580         u8 WinSize = pHTInfo->RxReorderWinSize;
 581         u16 WinEnd = 0;
 582         u8 index = 0;
 583         bool bMatchWinStart = false, bPktInBuf = false;
 584         unsigned long flags;
 585
 586         netdev_dbg(ieee->dev,
 587                    "%s(): Seq is %d, pTS->RxIndicateSeq is %d, WinSize is %d\n",
 588                    __func__, SeqNum, pTS->RxIndicateSeq, WinSize);
 589
 590         spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
 591
 592         WinEnd = (pTS->RxIndicateSeq + WinSize - 1) % 4096;
 593         /* Rx Reorder initialize condition.*/
 594         if (pTS->RxIndicateSeq == 0xffff)
 595                 pTS->RxIndicateSeq = SeqNum;
 596
 597         /* Drop out the packet which SeqNum is smaller than WinStart */
 598         if (SN_LESS(SeqNum, pTS->RxIndicateSeq)) {
 599                 netdev_dbg(ieee->dev,
 600                            "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
 601                            pTS->RxIndicateSeq, SeqNum);
 602                 pHTInfo->RxReorderDropCounter++;
 603                 {
 604                         int i;
 605
 606                         for (i = 0; i < prxb->nr_subframes; i++)
 607                                 dev_kfree_skb(prxb->subframes[i]);
 608                         kfree(prxb);
 609                         prxb = NULL;
 610                 }
 611                 spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 612                 return;
 613         }
 614
 615         /* Sliding window manipulation. Conditions includes:
 616          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 617          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 618          */
 619         if (SN_EQUAL(SeqNum, pTS->RxIndicateSeq)) {
 620                 pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) % 4096;
 621                 bMatchWinStart = true;
 622         } else if (SN_LESS(WinEnd, SeqNum)) {
 623                 if (SeqNum >= (WinSize - 1))
 624                         pTS->RxIndicateSeq = SeqNum + 1 - WinSize;
 625                 else
 626                         pTS->RxIndicateSeq = 4095 -
 627                                              (WinSize - (SeqNum + 1)) + 1;
 628                 netdev_dbg(ieee->dev,
 629                            "Window Shift! IndicateSeq: %d, NewSeq: %d\n",
 630                            pTS->RxIndicateSeq, SeqNum);
 631         }
 632
 633         /* Indication process.
 634          * After Packet dropping and Sliding Window shifting as above, we can
 635          * now just indicate the packets with the SeqNum smaller than latest
 636          * WinStart and struct buffer other packets.
 637          *
 638          * For Rx Reorder condition:
 639          * 1. All packets with SeqNum smaller than WinStart => Indicate
 640          * 2. All packets with SeqNum larger than or equal to
 641          *       WinStart => Buffer it.
 642          */
 643         if (bMatchWinStart) {
 644                 /* Current packet is going to be indicated.*/
 645                 netdev_dbg(ieee->dev,
 646                            "Packets indication! IndicateSeq: %d, NewSeq: %d\n",
 647                            pTS->RxIndicateSeq, SeqNum);
 648                 ieee->prxbIndicateArray[0] = prxb;
 649                 index = 1;
 650         } else {
 651                 /* Current packet is going to be inserted into pending list.*/
 652                 if (!list_empty(&ieee->RxReorder_Unused_List)) {
 653                         pReorderEntry = (struct rx_reorder_entry *)
 654                                         list_entry(ieee->RxReorder_Unused_List.next,
 655                                         struct rx_reorder_entry, List);
 656                         list_del_init(&pReorderEntry->List);
 657
 658                         /* Make a reorder entry and insert
 659                          * into a the packet list.
 660                          */
 661                         pReorderEntry->SeqNum = SeqNum;
 662                         pReorderEntry->prxb = prxb;
 663
 664                         if (!AddReorderEntry(pTS, pReorderEntry)) {
 665                                 int i;
 666
 667                                 netdev_dbg(ieee->dev,
 668                                            "%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
 669                                            __func__, pTS->RxIndicateSeq,
 670                                            SeqNum);
 671                                 list_add_tail(&pReorderEntry->List,
 672                                               &ieee->RxReorder_Unused_List);
 673
 674                                 for (i = 0; i < prxb->nr_subframes; i++)
 675                                         dev_kfree_skb(prxb->subframes[i]);
 676                                 kfree(prxb);
 677                                 prxb = NULL;
 678                         } else {
 679                                 netdev_dbg(ieee->dev,
 680                                            "Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
 681                                            pTS->RxIndicateSeq, SeqNum);
 682                         }
 683                 } else {
 684                         /* Packets are dropped if there are not enough reorder
 685                          * entries. This part should be modified!! We can just
 686                          * indicate all the packets in struct buffer and get
 687                          * reorder entries.
 688                          */
 689                         netdev_err(ieee->dev,
 690                                    "%s(): There is no reorder entry! Packet is dropped!\n",
 691                                    __func__);
 692                         {
 693                                 int i;
 694
 695                                 for (i = 0; i < prxb->nr_subframes; i++)
 696                                         dev_kfree_skb(prxb->subframes[i]);
 697                                 kfree(prxb);
 698                                 prxb = NULL;
 699                         }
 700                 }
 701         }
 702
 703         /* Check if there is any packet need indicate.*/
 704         while (!list_empty(&pTS->RxPendingPktList)) {
 705                 netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
 706                            __func__);
 707
 708                 pReorderEntry = (struct rx_reorder_entry *)
 709                                         list_entry(pTS->RxPendingPktList.prev,
 710                                                    struct rx_reorder_entry,
 711                                                    List);
 712                 if (SN_LESS(pReorderEntry->SeqNum, pTS->RxIndicateSeq) ||
 713                     SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq)) {
 714                         /* This protect struct buffer from overflow. */
 715                         if (index >= REORDER_WIN_SIZE) {
 716                                 netdev_err(ieee->dev,
 717                                            "%s(): Buffer overflow!\n",
 718                                            __func__);
 719                                 bPktInBuf = true;
 720                                 break;
 721                         }
 722
 723                         list_del_init(&pReorderEntry->List);
 724
 725                         if (SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq))
 726                                 pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) %
 727                                                      4096;
 728
 729                         ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
 730                         netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n",
 731                                    __func__, pReorderEntry->SeqNum);
 732                         index++;
 733
 734                         list_add_tail(&pReorderEntry->List,
 735                                       &ieee->RxReorder_Unused_List);
 736                 } else {
 737                         bPktInBuf = true;
 738                         break;
 739                 }
 740         }
 741
 742         /* Handling pending timer. Set this timer to prevent from long time
 743          * Rx buffering.
 744          */
 745         if (index > 0) {
 746                 if (timer_pending(&pTS->RxPktPendingTimer))
 747                         del_timer_sync(&pTS->RxPktPendingTimer);
 748                 pTS->RxTimeoutIndicateSeq = 0xffff;
 749
 750                 if (index > REORDER_WIN_SIZE) {
 751                         netdev_err(ieee->dev,
 752                                    "%s(): Rx Reorder struct buffer full!\n",
 753                                    __func__);
 754                         spin_unlock_irqrestore(&(ieee->reorder_spinlock),
 755                                                flags);
 756                         return;
 757                 }
 758                 rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
 759                 bPktInBuf = false;
 760         }
 761
 762         if (bPktInBuf && pTS->RxTimeoutIndicateSeq == 0xffff) {
 763                 netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
 764                 pTS->RxTimeoutIndicateSeq = pTS->RxIndicateSeq;
 765                 mod_timer(&pTS->RxPktPendingTimer, jiffies +
 766                           msecs_to_jiffies(pHTInfo->RxReorderPendingTime));
 767         }
 768         spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 769 }
 770
 771 static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
 772                          struct rtllib_rx_stats *rx_stats,
 773                          struct rtllib_rxb *rxb, u8 *src, u8 *dst)
 774 {
 775         struct rtllib_hdr_3addr  *hdr = (struct rtllib_hdr_3addr *)skb->data;
 776         u16             fc = le16_to_cpu(hdr->frame_ctl);
 777
 778         u16             LLCOffset = sizeof(struct rtllib_hdr_3addr);
 779         u16             ChkLength;
 780         bool            bIsAggregateFrame = false;
 781         u16             nSubframe_Length;
 782         u8              nPadding_Length = 0;
 783         u16             SeqNum = 0;
 784         struct sk_buff *sub_skb;
 785         /* just for debug purpose */
 786         SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctl));
 787         if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
 788            (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
 789                 bIsAggregateFrame = true;
 790
 791         if (RTLLIB_QOS_HAS_SEQ(fc))
 792                 LLCOffset += 2;
 793         if (rx_stats->bContainHTC)
 794                 LLCOffset += sHTCLng;
 795
 796         ChkLength = LLCOffset;
 797
 798         if (skb->len <= ChkLength)
 799                 return 0;
 800
 801         skb_pull(skb, LLCOffset);
 802         ieee->bIsAggregateFrame = bIsAggregateFrame;
 803         if (!bIsAggregateFrame) {
 804                 rxb->nr_subframes = 1;
 805
 806                 /* altered by clark 3/30/2010
 807                  * The struct buffer size of the skb indicated to upper layer
 808                  * must be less than 5000, or the defraged IP datagram
 809                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 810                  * discarded. so there must not use the function
 811                  * "skb_copy" and "skb_clone" for "skb".
 812                  */
 813
 814                 /* Allocate new skb for releasing to upper layer */
 815                 sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
 816                 if (!sub_skb)
 817                         return 0;
 818                 skb_reserve(sub_skb, 12);
 819                 skb_put_data(sub_skb, skb->data, skb->len);
 820                 sub_skb->dev = ieee->dev;
 821
 822                 rxb->subframes[0] = sub_skb;
 823
 824                 memcpy(rxb->src, src, ETH_ALEN);
 825                 memcpy(rxb->dst, dst, ETH_ALEN);
 826                 rxb->subframes[0]->dev = ieee->dev;
 827                 return 1;
 828         }
 829
 830         rxb->nr_subframes = 0;
 831         memcpy(rxb->src, src, ETH_ALEN);
 832         memcpy(rxb->dst, dst, ETH_ALEN);
 833         while (skb->len > ETHERNET_HEADER_SIZE) {
 834                 /* Offset 12 denote 2 mac address */
 835                 nSubframe_Length = *((u16 *)(skb->data + 12));
 836                 nSubframe_Length = (nSubframe_Length >> 8) +
 837                                    (nSubframe_Length << 8);
 838
 839                 if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 840                         netdev_info(ieee->dev,
 841                                     "%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
 842                                     __func__, rxb->nr_subframes);
 843                         netdev_info(ieee->dev,
 844                                     "%s: A-MSDU parse error!! Subframe Length: %d\n",
 845                                     __func__, nSubframe_Length);
 846                         netdev_info(ieee->dev,
 847                                     "nRemain_Length is %d and nSubframe_Length is : %d\n",
 848                                     skb->len, nSubframe_Length);
 849                         netdev_info(ieee->dev,
 850                                     "The Packet SeqNum is %d\n",
 851                                     SeqNum);
 852                         return 0;
 853                 }
 854
 855                 /* move the data point to data content */
 856                 skb_pull(skb, ETHERNET_HEADER_SIZE);
 857
 858                 /* altered by clark 3/30/2010
 859                  * The struct buffer size of the skb indicated to upper layer
 860                  * must be less than 5000, or the defraged IP datagram
 861                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 862                  * discarded. so there must not use the function
 863                  * "skb_copy" and "skb_clone" for "skb".
 864                  */
 865
 866                 /* Allocate new skb for releasing to upper layer */
 867                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 868                 if (!sub_skb)
 869                         return 0;
 870                 skb_reserve(sub_skb, 12);
 871                 skb_put_data(sub_skb, skb->data, nSubframe_Length);
 872
 873                 sub_skb->dev = ieee->dev;
 874                 rxb->subframes[rxb->nr_subframes++] = sub_skb;
 875                 if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
 876                         netdev_dbg(ieee->dev,
 877                                    "ParseSubframe(): Too many Subframes! Packets dropped!\n");
 878                         break;
 879                 }
 880                 skb_pull(skb, nSubframe_Length);
 881
 882                 if (skb->len != 0) {
 883                         nPadding_Length = 4 - ((nSubframe_Length +
 884                                           ETHERNET_HEADER_SIZE) % 4);
 885                         if (nPadding_Length == 4)
 886                                 nPadding_Length = 0;
 887
 888                         if (skb->len < nPadding_Length)
 889                                 return 0;
 890
 891                         skb_pull(skb, nPadding_Length);
 892                 }
 893         }
 894
 895         return rxb->nr_subframes;
 896 }
 897
 898
 899 static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
 900                                    struct sk_buff *skb,
 901                                    struct rtllib_rx_stats *rx_stats)
 902 {
 903         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 904         u16 fc = le16_to_cpu(hdr->frame_ctl);
 905         size_t hdrlen;
 906
 907         hdrlen = rtllib_get_hdrlen(fc);
 908         if (HTCCheck(ieee, skb->data)) {
 909                 if (net_ratelimit())
 910                         netdev_info(ieee->dev, "%s: find HTCControl!\n",
 911                                     __func__);
 912                 hdrlen += 4;
 913                 rx_stats->bContainHTC = true;
 914         }
 915
 916          if (RTLLIB_QOS_HAS_SEQ(fc))
 917                 rx_stats->bIsQosData = true;
 918
 919         return hdrlen;
 920 }
 921
 922 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
 923                                      struct sk_buff *skb, u8 multicast)
 924 {
 925         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 926         u16 fc, sc;
 927         u8 frag, type, stype;
 928
 929         fc = le16_to_cpu(hdr->frame_ctl);
 930         type = WLAN_FC_GET_TYPE(fc);
 931         stype = WLAN_FC_GET_STYPE(fc);
 932         sc = le16_to_cpu(hdr->seq_ctl);
 933         frag = WLAN_GET_SEQ_FRAG(sc);
 934
 935         if ((ieee->pHTInfo->bCurRxReorderEnable == false) ||
 936                 !ieee->current_network.qos_data.active ||
 937                 !IsDataFrame(skb->data) ||
 938                 IsLegacyDataFrame(skb->data)) {
 939                 if (!((type == RTLLIB_FTYPE_MGMT) &&
 940                       (stype == RTLLIB_STYPE_BEACON))) {
 941                         if (is_duplicate_packet(ieee, hdr))
 942                                 return -1;
 943                 }
 944         } else {
 945                 struct rx_ts_record *pRxTS = NULL;
 946
 947                 if (GetTs(ieee, (struct ts_common_info **) &pRxTS, hdr->addr2,
 948                         (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
 949                         if ((fc & (1<<11)) && (frag == pRxTS->RxLastFragNum) &&
 950                             (WLAN_GET_SEQ_SEQ(sc) == pRxTS->RxLastSeqNum))
 951                                 return -1;
 952                         pRxTS->RxLastFragNum = frag;
 953                         pRxTS->RxLastSeqNum = WLAN_GET_SEQ_SEQ(sc);
 954                 } else {
 955                         netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
 956                                     __func__);
 957                         return -1;
 958                 }
 959         }
 960
 961         return 0;
 962 }
 963
 964 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
 965                                    struct rtllib_hdr_4addr *hdr, u8 *dst,
 966                                    u8 *src, u8 *bssid)
 967 {
 968         u16 fc = le16_to_cpu(hdr->frame_ctl);
 969
 970         switch (fc & (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
 971         case RTLLIB_FCTL_FROMDS:
 972                 ether_addr_copy(dst, hdr->addr1);
 973                 ether_addr_copy(src, hdr->addr3);
 974                 ether_addr_copy(bssid, hdr->addr2);
 975                 break;
 976         case RTLLIB_FCTL_TODS:
 977                 ether_addr_copy(dst, hdr->addr3);
 978                 ether_addr_copy(src, hdr->addr2);
 979                 ether_addr_copy(bssid, hdr->addr1);
 980                 break;
 981         case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
 982                 ether_addr_copy(dst, hdr->addr3);
 983                 ether_addr_copy(src, hdr->addr4);
 984                 ether_addr_copy(bssid, ieee->current_network.bssid);
 985                 break;
 986         default:
 987                 ether_addr_copy(dst, hdr->addr1);
 988                 ether_addr_copy(src, hdr->addr2);
 989                 ether_addr_copy(bssid, hdr->addr3);
 990                 break;
 991         }
 992 }
 993
 994 static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
 995                                  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
 996 {
 997         u8 type, stype;
 998
 999         type = WLAN_FC_GET_TYPE(fc);
1000         stype = WLAN_FC_GET_STYPE(fc);
1001
1002         /* Filter frames from different BSS */
1003         if (((fc & RTLLIB_FCTL_DSTODS) != RTLLIB_FCTL_DSTODS) &&
1004             !ether_addr_equal(ieee->current_network.bssid, bssid) &&
1005             !is_zero_ether_addr(ieee->current_network.bssid)) {
1006                 return -1;
1007         }
1008
1009         /* Filter packets sent by an STA that will be forwarded by AP */
1010         if (ieee->IntelPromiscuousModeInfo.bPromiscuousOn  &&
1011                 ieee->IntelPromiscuousModeInfo.bFilterSourceStationFrame) {
1012                 if ((fc & RTLLIB_FCTL_TODS) && !(fc & RTLLIB_FCTL_FROMDS) &&
1013                     !ether_addr_equal(dst, ieee->current_network.bssid) &&
1014                     ether_addr_equal(bssid, ieee->current_network.bssid)) {
1015                         return -1;
1016                 }
1017         }
1018
1019         /* Nullfunc frames may have PS-bit set, so they must be passed to
1020          * hostap_handle_sta_rx() before being dropped here.
1021          */
1022         if (!ieee->IntelPromiscuousModeInfo.bPromiscuousOn) {
1023                 if (stype != RTLLIB_STYPE_DATA &&
1024                     stype != RTLLIB_STYPE_DATA_CFACK &&
1025                     stype != RTLLIB_STYPE_DATA_CFPOLL &&
1026                     stype != RTLLIB_STYPE_DATA_CFACKPOLL &&
1027                     stype != RTLLIB_STYPE_QOS_DATA) {
1028                         if (stype != RTLLIB_STYPE_NULLFUNC)
1029                                 netdev_dbg(ieee->dev,
1030                                            "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
1031                                            type, stype);
1032                         return -1;
1033                 }
1034         }
1035
1036         if (ieee->iw_mode != IW_MODE_MESH) {
1037                 /* packets from our adapter are dropped (echo) */
1038                 if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
1039                         return -1;
1040
1041                 /* {broad,multi}cast packets to our BSS go through */
1042                 if (is_multicast_ether_addr(dst)) {
1043                         if (memcmp(bssid, ieee->current_network.bssid,
1044                                    ETH_ALEN))
1045                                 return -1;
1046                 }
1047         }
1048         return 0;
1049 }
1050
1051 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
1052                         struct lib80211_crypt_data **crypt, size_t hdrlen)
1053 {
1054         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1055         u16 fc = le16_to_cpu(hdr->frame_ctl);
1056         int idx = 0;
1057
1058         if (ieee->host_decrypt) {
1059                 if (skb->len >= hdrlen + 3)
1060                         idx = skb->data[hdrlen + 3] >> 6;
1061
1062                 *crypt = ieee->crypt_info.crypt[idx];
1063                 /* allow NULL decrypt to indicate an station specific override
1064                  * for default encryption
1065                  */
1066                 if (*crypt && ((*crypt)->ops == NULL ||
1067                               (*crypt)->ops->decrypt_mpdu == NULL))
1068                         *crypt = NULL;
1069
1070                 if (!*crypt && (fc & RTLLIB_FCTL_WEP)) {
1071                         /* This seems to be triggered by some (multicast?)
1072                          * frames from other than current BSS, so just drop the
1073                          * frames silently instead of filling system log with
1074                          * these reports.
1075                          */
1076                         netdev_dbg(ieee->dev,
1077                                    "Decryption failed (not set) (SA= %pM)\n",
1078                                    hdr->addr2);
1079                         return -1;
1080                 }
1081         }
1082
1083         return 0;
1084 }
1085
1086 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1087                       struct rtllib_rx_stats *rx_stats,
1088                       struct lib80211_crypt_data *crypt, size_t hdrlen)
1089 {
1090         struct rtllib_hdr_4addr *hdr;
1091         int keyidx = 0;
1092         u16 fc, sc;
1093         u8 frag;
1094
1095         hdr = (struct rtllib_hdr_4addr *)skb->data;
1096         fc = le16_to_cpu(hdr->frame_ctl);
1097         sc = le16_to_cpu(hdr->seq_ctl);
1098         frag = WLAN_GET_SEQ_FRAG(sc);
1099
1100         if ((!rx_stats->Decrypted))
1101                 ieee->need_sw_enc = 1;
1102         else
1103                 ieee->need_sw_enc = 0;
1104
1105         keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1106         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) && (keyidx < 0)) {
1107                 netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
1108                 return -1;
1109         }
1110
1111         hdr = (struct rtllib_hdr_4addr *) skb->data;
1112         if ((frag != 0 || (fc & RTLLIB_FCTL_MOREFRAGS))) {
1113                 int flen;
1114                 struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1115
1116                 netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
1117
1118                 if (!frag_skb) {
1119                         netdev_dbg(ieee->dev,
1120                                    "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
1121                                    (fc & RTLLIB_FCTL_MOREFRAGS) != 0,
1122                                    WLAN_GET_SEQ_SEQ(sc), frag);
1123                         return -1;
1124                 }
1125                 flen = skb->len;
1126                 if (frag != 0)
1127                         flen -= hdrlen;
1128
1129                 if (frag_skb->tail + flen > frag_skb->end) {
1130                         netdev_warn(ieee->dev,
1131                                     "%s: host decrypted and reassembled frame did not fit skb\n",
1132                                     __func__);
1133                         rtllib_frag_cache_invalidate(ieee, hdr);
1134                         return -1;
1135                 }
1136
1137                 if (frag == 0) {
1138                         /* copy first fragment (including full headers) into
1139                          * beginning of the fragment cache skb
1140                          */
1141                         skb_put_data(frag_skb, skb->data, flen);
1142                 } else {
1143                         /* append frame payload to the end of the fragment
1144                          * cache skb
1145                          */
1146                         skb_put_data(frag_skb, skb->data + hdrlen, flen);
1147                 }
1148                 dev_kfree_skb_any(skb);
1149                 skb = NULL;
1150
1151                 if (fc & RTLLIB_FCTL_MOREFRAGS) {
1152                         /* more fragments expected - leave the skb in fragment
1153                          * cache for now; it will be delivered to upper layers
1154                          * after all fragments have been received
1155                          */
1156                         return -2;
1157                 }
1158
1159                 /* this was the last fragment and the frame will be
1160                  * delivered, so remove skb from fragment cache
1161                  */
1162                 skb = frag_skb;
1163                 hdr = (struct rtllib_hdr_4addr *) skb->data;
1164                 rtllib_frag_cache_invalidate(ieee, hdr);
1165         }
1166
1167         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1168          * encrypted/authenticated
1169          */
1170         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) &&
1171                 rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1172                 netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
1173                 return -1;
1174         }
1175
1176         hdr = (struct rtllib_hdr_4addr *) skb->data;
1177         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep) {
1178                 if (/*ieee->ieee802_1x &&*/
1179                     rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1180
1181                         /* pass unencrypted EAPOL frames even if encryption is
1182                          * configured
1183                          */
1184                         struct eapol *eap = (struct eapol *)(skb->data +
1185                                 24);
1186                         netdev_dbg(ieee->dev,
1187                                    "RX: IEEE 802.1X EAPOL frame: %s\n",
1188                                    eap_get_type(eap->type));
1189                 } else {
1190                         netdev_dbg(ieee->dev,
1191                                    "encryption configured, but RX frame not encrypted (SA= %pM)\n",
1192                                    hdr->addr2);
1193                         return -1;
1194                 }
1195         }
1196
1197         if (crypt && !(fc & RTLLIB_FCTL_WEP) &&
1198             rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1199                 struct eapol *eap = (struct eapol *)(skb->data + 24);
1200
1201                 netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
1202                            eap_get_type(eap->type));
1203         }
1204
1205         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep &&
1206             !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1207                 netdev_dbg(ieee->dev,
1208                            "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
1209                            hdr->addr2);
1210                 return -1;
1211         }
1212
1213         return 0;
1214 }
1215
1216 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
1217                                       u8 nr_subframes)
1218 {
1219         if (unicast) {
1220
1221                 if (ieee->state == RTLLIB_LINKED) {
1222                         if (((ieee->LinkDetectInfo.NumRxUnicastOkInPeriod +
1223                             ieee->LinkDetectInfo.NumTxOkInPeriod) > 8) ||
1224                             (ieee->LinkDetectInfo.NumRxUnicastOkInPeriod > 2)) {
1225                                 if (ieee->LeisurePSLeave)
1226                                         ieee->LeisurePSLeave(ieee->dev);
1227                         }
1228                 }
1229         }
1230         ieee->last_rx_ps_time = jiffies;
1231 }
1232
1233 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1234                 struct rtllib_rx_stats *rx_stats,
1235                 struct rtllib_rxb *rxb,
1236                 u8 *dst,
1237                 u8 *src)
1238 {
1239         struct net_device *dev = ieee->dev;
1240         u16 ethertype;
1241         int i = 0;
1242
1243         if (rxb == NULL) {
1244                 netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
1245                 return;
1246         }
1247
1248         for (i = 0; i < rxb->nr_subframes; i++) {
1249                 struct sk_buff *sub_skb = rxb->subframes[i];
1250
1251                 if (sub_skb) {
1252                         /* convert hdr + possible LLC headers
1253                          * into Ethernet header
1254                          */
1255                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1256                         if (sub_skb->len >= 8 &&
1257                                 ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1258                                 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1259                                 memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1260                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
1261                                  * and replace EtherType
1262                                  */
1263                                 skb_pull(sub_skb, SNAP_SIZE);
1264                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1265                                                 src);
1266                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1267                                                 dst);
1268                         } else {
1269                                 u16 len;
1270                                 /* Leave Ethernet header part of hdr
1271                                  * and full payload
1272                                  */
1273                                 len = sub_skb->len;
1274                                 memcpy(skb_push(sub_skb, 2), &len, 2);
1275                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1276                                                 src);
1277                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1278                                                 dst);
1279                         }
1280
1281                         ieee->stats.rx_packets++;
1282                         ieee->stats.rx_bytes += sub_skb->len;
1283
1284                         if (is_multicast_ether_addr(dst))
1285                                 ieee->stats.multicast++;
1286
1287                         /* Indicate the packets to upper layer */
1288                         memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1289                         sub_skb->protocol = eth_type_trans(sub_skb, dev);
1290                         sub_skb->dev = dev;
1291                         sub_skb->dev->stats.rx_packets++;
1292                         sub_skb->dev->stats.rx_bytes += sub_skb->len;
1293                         /* 802.11 crc not sufficient */
1294                         sub_skb->ip_summed = CHECKSUM_NONE;
1295                         netif_rx(sub_skb);
1296                 }
1297         }
1298         kfree(rxb);
1299 }
1300
1301 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1302                  struct rtllib_rx_stats *rx_stats)
1303 {
1304         struct net_device *dev = ieee->dev;
1305         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1306         struct lib80211_crypt_data *crypt = NULL;
1307         struct rtllib_rxb *rxb = NULL;
1308         struct rx_ts_record *pTS = NULL;
1309         u16 fc, sc, SeqNum = 0;
1310         u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1311         u8 *payload;
1312         u8 dst[ETH_ALEN];
1313         u8 src[ETH_ALEN];
1314         u8 bssid[ETH_ALEN] = {0};
1315
1316         size_t hdrlen = 0;
1317         bool bToOtherSTA = false;
1318         int ret = 0, i = 0;
1319
1320         hdr = (struct rtllib_hdr_4addr *)skb->data;
1321         fc = le16_to_cpu(hdr->frame_ctl);
1322         type = WLAN_FC_GET_TYPE(fc);
1323         stype = WLAN_FC_GET_STYPE(fc);
1324         sc = le16_to_cpu(hdr->seq_ctl);
1325
1326         /*Filter pkt not to me*/
1327         multicast = is_multicast_ether_addr(hdr->addr1);
1328         unicast = !multicast;
1329         if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1)) {
1330                 if (ieee->bNetPromiscuousMode)
1331                         bToOtherSTA = true;
1332                 else
1333                         goto rx_dropped;
1334         }
1335
1336         /*Filter pkt has too small length */
1337         hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1338         if (skb->len < hdrlen) {
1339                 netdev_info(dev,
1340                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1341                             __func__);
1342                 goto rx_dropped;
1343         }
1344
1345         /* Filter Duplicate pkt */
1346         ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1347         if (ret < 0)
1348                 goto rx_dropped;
1349
1350         /* Filter CTRL Frame */
1351         if (type == RTLLIB_FTYPE_CTL)
1352                 goto rx_dropped;
1353
1354         /* Filter MGNT Frame */
1355         if (type == RTLLIB_FTYPE_MGMT) {
1356                 if (bToOtherSTA)
1357                         goto rx_dropped;
1358                 if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1359                         goto rx_dropped;
1360                 else
1361                         goto rx_exit;
1362         }
1363
1364         /* Filter WAPI DATA Frame */
1365
1366         /* Update statstics for AP roaming */
1367         if (!bToOtherSTA) {
1368                 ieee->LinkDetectInfo.NumRecvDataInPeriod++;
1369                 ieee->LinkDetectInfo.NumRxOkInPeriod++;
1370         }
1371
1372         /* Data frame - extract src/dst addresses */
1373         rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1374
1375         /* Filter Data frames */
1376         ret = rtllib_rx_data_filter(ieee, fc, dst, src, bssid, hdr->addr2);
1377         if (ret < 0)
1378                 goto rx_dropped;
1379
1380         if (skb->len == hdrlen)
1381                 goto rx_dropped;
1382
1383         /* Send pspoll based on moredata */
1384         if ((ieee->iw_mode == IW_MODE_INFRA)  &&
1385             (ieee->sta_sleep == LPS_IS_SLEEP) &&
1386             (ieee->polling) && (!bToOtherSTA)) {
1387                 if (WLAN_FC_MORE_DATA(fc)) {
1388                         /* more data bit is set, let's request a new frame
1389                          * from the AP
1390                          */
1391                         rtllib_sta_ps_send_pspoll_frame(ieee);
1392                 } else {
1393                         ieee->polling =  false;
1394                 }
1395         }
1396
1397         /* Get crypt if encrypted */
1398         ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1399         if (ret == -1)
1400                 goto rx_dropped;
1401
1402         /* Decrypt data frame (including reassemble) */
1403         ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1404         if (ret == -1)
1405                 goto rx_dropped;
1406         else if (ret == -2)
1407                 goto rx_exit;
1408
1409         /* Get TS for Rx Reorder  */
1410         hdr = (struct rtllib_hdr_4addr *) skb->data;
1411         if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1412                 && !is_multicast_ether_addr(hdr->addr1)
1413                 && (!bToOtherSTA)) {
1414                 TID = Frame_QoSTID(skb->data);
1415                 SeqNum = WLAN_GET_SEQ_SEQ(sc);
1416                 GetTs(ieee, (struct ts_common_info **) &pTS, hdr->addr2, TID,
1417                       RX_DIR, true);
1418                 if (TID != 0 && TID != 3)
1419                         ieee->bis_any_nonbepkts = true;
1420         }
1421
1422         /* Parse rx data frame (For AMSDU) */
1423         /* skb: hdr + (possible reassembled) full plaintext payload */
1424         payload = skb->data + hdrlen;
1425         rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1426         if (!rxb)
1427                 goto rx_dropped;
1428
1429         /* to parse amsdu packets */
1430         /* qos data packets & reserved bit is 1 */
1431         if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1432                 /* only to free rxb, and not submit the packets
1433                  * to upper layer
1434                  */
1435                 for (i = 0; i < rxb->nr_subframes; i++)
1436                         dev_kfree_skb(rxb->subframes[i]);
1437                 kfree(rxb);
1438                 rxb = NULL;
1439                 goto rx_dropped;
1440         }
1441
1442         /* Update WAPI PN */
1443
1444         /* Check if leave LPS */
1445         if (!bToOtherSTA) {
1446                 if (ieee->bIsAggregateFrame)
1447                         nr_subframes = rxb->nr_subframes;
1448                 else
1449                         nr_subframes = 1;
1450                 if (unicast)
1451                         ieee->LinkDetectInfo.NumRxUnicastOkInPeriod += nr_subframes;
1452                 rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1453         }
1454
1455         /* Indicate packets to upper layer or Rx Reorder */
1456         if (ieee->pHTInfo->bCurRxReorderEnable == false || pTS == NULL ||
1457             bToOtherSTA)
1458                 rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1459         else
1460                 RxReorderIndicatePacket(ieee, rxb, pTS, SeqNum);
1461
1462         dev_kfree_skb(skb);
1463
1464  rx_exit:
1465         return 1;
1466
1467  rx_dropped:
1468         ieee->stats.rx_dropped++;
1469
1470         /* Returning 0 indicates to caller that we have not handled the SKB--
1471          * so it is still allocated and can be used again by underlying
1472          * hardware as a DMA target
1473          */
1474         return 0;
1475 }
1476
1477 static int rtllib_rx_Master(struct rtllib_device *ieee, struct sk_buff *skb,
1478                  struct rtllib_rx_stats *rx_stats)
1479 {
1480         return 0;
1481 }
1482
1483 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1484                  struct rtllib_rx_stats *rx_stats)
1485 {
1486         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1487         u16 fc = le16_to_cpu(hdr->frame_ctl);
1488         size_t hdrlen = rtllib_get_hdrlen(fc);
1489
1490         if (skb->len < hdrlen) {
1491                 netdev_info(ieee->dev,
1492                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1493                             __func__);
1494                 return 0;
1495         }
1496
1497         if (HTCCheck(ieee, skb->data)) {
1498                 if (net_ratelimit())
1499                         netdev_info(ieee->dev, "%s: Find HTCControl!\n",
1500                                     __func__);
1501                 hdrlen += 4;
1502         }
1503
1504         rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1505         ieee->stats.rx_packets++;
1506         ieee->stats.rx_bytes += skb->len;
1507
1508         return 1;
1509 }
1510
1511 static int rtllib_rx_Mesh(struct rtllib_device *ieee, struct sk_buff *skb,
1512                  struct rtllib_rx_stats *rx_stats)
1513 {
1514         return 0;
1515 }
1516
1517 /* All received frames are sent to this function. @skb contains the frame in
1518  * IEEE 802.11 format, i.e., in the format it was sent over air.
1519  * This function is called only as a tasklet (software IRQ).
1520  */
1521 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1522                  struct rtllib_rx_stats *rx_stats)
1523 {
1524         int ret = 0;
1525
1526         if (!ieee || !skb || !rx_stats) {
1527                 pr_info("%s: Input parameters NULL!\n", __func__);
1528                 goto rx_dropped;
1529         }
1530         if (skb->len < 10) {
1531                 netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
1532                 goto rx_dropped;
1533         }
1534
1535         switch (ieee->iw_mode) {
1536         case IW_MODE_ADHOC:
1537         case IW_MODE_INFRA:
1538                 ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1539                 break;
1540         case IW_MODE_MASTER:
1541         case IW_MODE_REPEAT:
1542                 ret = rtllib_rx_Master(ieee, skb, rx_stats);
1543                 break;
1544         case IW_MODE_MONITOR:
1545                 ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1546                 break;
1547         case IW_MODE_MESH:
1548                 ret = rtllib_rx_Mesh(ieee, skb, rx_stats);
1549                 break;
1550         default:
1551                 netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
1552                 break;
1553         }
1554
1555         return ret;
1556
1557  rx_dropped:
1558         if (ieee)
1559                 ieee->stats.rx_dropped++;
1560         return 0;
1561 }
1562 EXPORT_SYMBOL(rtllib_rx);
1563
1564 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1565
1566 /* Make ther structure we read from the beacon packet has the right values */
1567 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1568                                      *info_element, int sub_type)
1569 {
1570
1571         if (info_element->qui_subtype != sub_type)
1572                 return -1;
1573         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1574                 return -1;
1575         if (info_element->qui_type != QOS_OUI_TYPE)
1576                 return -1;
1577         if (info_element->version != QOS_VERSION_1)
1578                 return -1;
1579
1580         return 0;
1581 }
1582
1583
1584 /* Parse a QoS parameter element */
1585 static int rtllib_read_qos_param_element(struct rtllib_qos_parameter_info
1586                                                         *element_param,
1587                                          struct rtllib_info_element
1588                                                         *info_element)
1589 {
1590         int ret = 0;
1591         u16 size = sizeof(struct rtllib_qos_parameter_info) - 2;
1592
1593         if ((info_element == NULL) || (element_param == NULL))
1594                 return -1;
1595
1596         if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
1597                 memcpy(element_param->info_element.qui, info_element->data,
1598                        info_element->len);
1599                 element_param->info_element.elementID = info_element->id;
1600                 element_param->info_element.length = info_element->len;
1601         } else
1602                 ret = -1;
1603         if (ret == 0)
1604                 ret = rtllib_verify_qos_info(&element_param->info_element,
1605                                                 QOS_OUI_PARAM_SUB_TYPE);
1606         return ret;
1607 }
1608
1609 /* Parse a QoS information element */
1610 static int rtllib_read_qos_info_element(struct rtllib_qos_information_element
1611                                                         *element_info,
1612                                         struct rtllib_info_element
1613                                                         *info_element)
1614 {
1615         int ret = 0;
1616         u16 size = sizeof(struct rtllib_qos_information_element) - 2;
1617
1618         if (element_info == NULL)
1619                 return -1;
1620         if (info_element == NULL)
1621                 return -1;
1622
1623         if ((info_element->id == QOS_ELEMENT_ID) &&
1624             (info_element->len == size)) {
1625                 memcpy(element_info->qui, info_element->data,
1626                        info_element->len);
1627                 element_info->elementID = info_element->id;
1628                 element_info->length = info_element->len;
1629         } else
1630                 ret = -1;
1631
1632         if (ret == 0)
1633                 ret = rtllib_verify_qos_info(element_info,
1634                                              QOS_OUI_INFO_SUB_TYPE);
1635         return ret;
1636 }
1637
1638
1639 /* Write QoS parameters from the ac parameters. */
1640 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1641                                                struct rtllib_qos_data *qos_data)
1642 {
1643         struct rtllib_qos_ac_parameter *ac_params;
1644         struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1645         int i;
1646         u8 aci;
1647         u8 acm;
1648
1649         qos_data->wmm_acm = 0;
1650         for (i = 0; i < QOS_QUEUE_NUM; i++) {
1651                 ac_params = &(param_elm->ac_params_record[i]);
1652
1653                 aci = (ac_params->aci_aifsn & 0x60) >> 5;
1654                 acm = (ac_params->aci_aifsn & 0x10) >> 4;
1655
1656                 if (aci >= QOS_QUEUE_NUM)
1657                         continue;
1658                 switch (aci) {
1659                 case 1:
1660                         /* BIT(0) | BIT(3) */
1661                         if (acm)
1662                                 qos_data->wmm_acm |= (0x01<<0)|(0x01<<3);
1663                         break;
1664                 case 2:
1665                         /* BIT(4) | BIT(5) */
1666                         if (acm)
1667                                 qos_data->wmm_acm |= (0x01<<4)|(0x01<<5);
1668                         break;
1669                 case 3:
1670                         /* BIT(6) | BIT(7) */
1671                         if (acm)
1672                                 qos_data->wmm_acm |= (0x01<<6)|(0x01<<7);
1673                         break;
1674                 case 0:
1675                 default:
1676                         /* BIT(1) | BIT(2) */
1677                         if (acm)
1678                                 qos_data->wmm_acm |= (0x01<<1)|(0x01<<2);
1679                         break;
1680                 }
1681
1682                 qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1683
1684                 /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1685                 qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
1686
1687                 qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
1688                                                      0x0F);
1689
1690                 qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
1691                                                       0xF0) >> 4);
1692
1693                 qos_param->flag[aci] =
1694                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1695                 qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
1696         }
1697         return 0;
1698 }
1699
1700 /* we have a generic data element which it may contain QoS information or
1701  * parameters element. check the information element length to decide
1702  * which type to read
1703  */
1704 static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
1705                                           struct rtllib_info_element
1706                                              *info_element,
1707                                           struct rtllib_network *network)
1708 {
1709         int rc = 0;
1710         struct rtllib_qos_information_element qos_info_element;
1711
1712         rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1713
1714         if (rc == 0) {
1715                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1716                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1717         } else {
1718                 struct rtllib_qos_parameter_info param_element;
1719
1720                 rc = rtllib_read_qos_param_element(&param_element,
1721                                                       info_element);
1722                 if (rc == 0) {
1723                         rtllib_qos_convert_ac_to_parameters(&param_element,
1724                                                                &(network->qos_data));
1725                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1726                         network->qos_data.param_count =
1727                             param_element.info_element.ac_info & 0x0F;
1728                 }
1729         }
1730
1731         if (rc == 0) {
1732                 netdev_dbg(ieee->dev, "QoS is supported\n");
1733                 network->qos_data.supported = 1;
1734         }
1735         return rc;
1736 }
1737
1738 static const char *get_info_element_string(u16 id)
1739 {
1740         switch (id) {
1741         case MFIE_TYPE_SSID:
1742                 return "SSID";
1743         case MFIE_TYPE_RATES:
1744                 return "RATES";
1745         case MFIE_TYPE_FH_SET:
1746                 return "FH_SET";
1747         case MFIE_TYPE_DS_SET:
1748                 return "DS_SET";
1749         case MFIE_TYPE_CF_SET:
1750                 return "CF_SET";
1751         case MFIE_TYPE_TIM:
1752                 return "TIM";
1753         case MFIE_TYPE_IBSS_SET:
1754                 return "IBSS_SET";
1755         case MFIE_TYPE_COUNTRY:
1756                 return "COUNTRY";
1757         case MFIE_TYPE_HOP_PARAMS:
1758                 return "HOP_PARAMS";
1759         case MFIE_TYPE_HOP_TABLE:
1760                 return "HOP_TABLE";
1761         case MFIE_TYPE_REQUEST:
1762                 return "REQUEST";
1763         case MFIE_TYPE_CHALLENGE:
1764                 return "CHALLENGE";
1765         case MFIE_TYPE_POWER_CONSTRAINT:
1766                 return "POWER_CONSTRAINT";
1767         case MFIE_TYPE_POWER_CAPABILITY:
1768                 return "POWER_CAPABILITY";
1769         case MFIE_TYPE_TPC_REQUEST:
1770                 return "TPC_REQUEST";
1771         case MFIE_TYPE_TPC_REPORT:
1772                 return "TPC_REPORT";
1773         case MFIE_TYPE_SUPP_CHANNELS:
1774                 return "SUPP_CHANNELS";
1775         case MFIE_TYPE_CSA:
1776                 return "CSA";
1777         case MFIE_TYPE_MEASURE_REQUEST:
1778                 return "MEASURE_REQUEST";
1779         case MFIE_TYPE_MEASURE_REPORT:
1780                 return "MEASURE_REPORT";
1781         case MFIE_TYPE_QUIET:
1782                 return "QUIET";
1783         case MFIE_TYPE_IBSS_DFS:
1784                 return "IBSS_DFS";
1785         case MFIE_TYPE_RSN:
1786                 return "RSN";
1787         case MFIE_TYPE_RATES_EX:
1788                 return "RATES_EX";
1789         case MFIE_TYPE_GENERIC:
1790                 return "GENERIC";
1791         case MFIE_TYPE_QOS_PARAMETER:
1792                 return "QOS_PARAMETER";
1793         default:
1794                 return "UNKNOWN";
1795         }
1796 }
1797
1798 static inline void rtllib_extract_country_ie(
1799         struct rtllib_device *ieee,
1800         struct rtllib_info_element *info_element,
1801         struct rtllib_network *network,
1802         u8 *addr2)
1803 {
1804         if (IS_DOT11D_ENABLE(ieee)) {
1805                 if (info_element->len != 0) {
1806                         memcpy(network->CountryIeBuf, info_element->data,
1807                                info_element->len);
1808                         network->CountryIeLen = info_element->len;
1809
1810                         if (!IS_COUNTRY_IE_VALID(ieee)) {
1811                                 if (rtllib_act_scanning(ieee, false) &&
1812                                     ieee->FirstIe_InScan)
1813                                         netdev_info(ieee->dev,
1814                                                     "Received beacon ContryIE, SSID: <%s>\n",
1815                                                     network->ssid);
1816                                 Dot11d_UpdateCountryIe(ieee, addr2,
1817                                                        info_element->len,
1818                                                        info_element->data);
1819                         }
1820                 }
1821
1822                 if (IS_EQUAL_CIE_SRC(ieee, addr2))
1823                         UPDATE_CIE_WATCHDOG(ieee);
1824         }
1825 }
1826
1827 static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
1828                                       struct rtllib_info_element *info_element,
1829                                       struct rtllib_network *network,
1830                                       u16 *tmp_htcap_len,
1831                                       u16 *tmp_htinfo_len)
1832 {
1833         u16 ht_realtek_agg_len = 0;
1834         u8  ht_realtek_agg_buf[MAX_IE_LEN];
1835
1836         if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
1837                 return;
1838         if (info_element->len >= 4 &&
1839             info_element->data[0] == 0x00 &&
1840             info_element->data[1] == 0x50 &&
1841             info_element->data[2] == 0xf2 &&
1842             info_element->data[3] == 0x01) {
1843                 network->wpa_ie_len = min(info_element->len + 2,
1844                                           MAX_WPA_IE_LEN);
1845                 memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
1846                 return;
1847         }
1848         if (info_element->len == 7 &&
1849             info_element->data[0] == 0x00 &&
1850             info_element->data[1] == 0xe0 &&
1851             info_element->data[2] == 0x4c &&
1852             info_element->data[3] == 0x01 &&
1853             info_element->data[4] == 0x02)
1854                 network->Turbo_Enable = 1;
1855
1856         if (*tmp_htcap_len == 0) {
1857                 if (info_element->len >= 4 &&
1858                     info_element->data[0] == 0x00 &&
1859                     info_element->data[1] == 0x90 &&
1860                     info_element->data[2] == 0x4c &&
1861                     info_element->data[3] == 0x033) {
1862                         *tmp_htcap_len = min_t(u8, info_element->len,
1863                                                MAX_IE_LEN);
1864                         if (*tmp_htcap_len != 0) {
1865                                 network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1866                                 network->bssht.bdHTCapLen = min_t(u16, *tmp_htcap_len, sizeof(network->bssht.bdHTCapBuf));
1867                                 memcpy(network->bssht.bdHTCapBuf,
1868                                        info_element->data,
1869                                        network->bssht.bdHTCapLen);
1870                         }
1871                 }
1872                 if (*tmp_htcap_len != 0) {
1873                         network->bssht.bdSupportHT = true;
1874                         network->bssht.bdHT1R = ((((struct ht_capab_ele *)(network->bssht.bdHTCapBuf))->MCS[1]) == 0);
1875                 } else {
1876                         network->bssht.bdSupportHT = false;
1877                         network->bssht.bdHT1R = false;
1878                 }
1879         }
1880
1881
1882         if (*tmp_htinfo_len == 0) {
1883                 if (info_element->len >= 4 &&
1884                     info_element->data[0] == 0x00 &&
1885                     info_element->data[1] == 0x90 &&
1886                     info_element->data[2] == 0x4c &&
1887                     info_element->data[3] == 0x034) {
1888                         *tmp_htinfo_len = min_t(u8, info_element->len,
1889                                                 MAX_IE_LEN);
1890                         if (*tmp_htinfo_len != 0) {
1891                                 network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1892                                 network->bssht.bdHTInfoLen = min_t(u16, *tmp_htinfo_len, sizeof(network->bssht.bdHTInfoBuf));
1893                                 memcpy(network->bssht.bdHTInfoBuf,
1894                                        info_element->data,
1895                                        network->bssht.bdHTInfoLen);
1896                         }
1897                 }
1898         }
1899
1900         if (network->bssht.bdSupportHT) {
1901                 if (info_element->len >= 4 &&
1902                     info_element->data[0] == 0x00 &&
1903                     info_element->data[1] == 0xe0 &&
1904                     info_element->data[2] == 0x4c &&
1905                     info_element->data[3] == 0x02) {
1906                         ht_realtek_agg_len = min_t(u8, info_element->len,
1907                                                    MAX_IE_LEN);
1908                         memcpy(ht_realtek_agg_buf, info_element->data,
1909                                info_element->len);
1910                 }
1911                 if (ht_realtek_agg_len >= 5) {
1912                         network->realtek_cap_exit = true;
1913                         network->bssht.bdRT2RTAggregation = true;
1914
1915                         if ((ht_realtek_agg_buf[4] == 1) &&
1916                             (ht_realtek_agg_buf[5] & 0x02))
1917                                 network->bssht.bdRT2RTLongSlotTime = true;
1918
1919                         if ((ht_realtek_agg_buf[4] == 1) &&
1920                             (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1921                                 network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_92SE;
1922                 }
1923         }
1924         if (ht_realtek_agg_len >= 5) {
1925                 if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1926                         network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_SOFTAP;
1927         }
1928
1929         if ((info_element->len >= 3 &&
1930              info_element->data[0] == 0x00 &&
1931              info_element->data[1] == 0x05 &&
1932              info_element->data[2] == 0xb5) ||
1933              (info_element->len >= 3 &&
1934              info_element->data[0] == 0x00 &&
1935              info_element->data[1] == 0x0a &&
1936              info_element->data[2] == 0xf7) ||
1937              (info_element->len >= 3 &&
1938              info_element->data[0] == 0x00 &&
1939              info_element->data[1] == 0x10 &&
1940              info_element->data[2] == 0x18)) {
1941                 network->broadcom_cap_exist = true;
1942         }
1943         if (info_element->len >= 3 &&
1944             info_element->data[0] == 0x00 &&
1945             info_element->data[1] == 0x0c &&
1946             info_element->data[2] == 0x43)
1947                 network->ralink_cap_exist = true;
1948         if ((info_element->len >= 3 &&
1949              info_element->data[0] == 0x00 &&
1950              info_element->data[1] == 0x03 &&
1951              info_element->data[2] == 0x7f) ||
1952              (info_element->len >= 3 &&
1953              info_element->data[0] == 0x00 &&
1954              info_element->data[1] == 0x13 &&
1955              info_element->data[2] == 0x74))
1956                 network->atheros_cap_exist = true;
1957
1958         if ((info_element->len >= 3 &&
1959              info_element->data[0] == 0x00 &&
1960              info_element->data[1] == 0x50 &&
1961              info_element->data[2] == 0x43))
1962                 network->marvell_cap_exist = true;
1963         if (info_element->len >= 3 &&
1964             info_element->data[0] == 0x00 &&
1965             info_element->data[1] == 0x40 &&
1966             info_element->data[2] == 0x96)
1967                 network->cisco_cap_exist = true;
1968
1969
1970         if (info_element->len >= 3 &&
1971             info_element->data[0] == 0x00 &&
1972             info_element->data[1] == 0x0a &&
1973             info_element->data[2] == 0xf5)
1974                 network->airgo_cap_exist = true;
1975
1976         if (info_element->len > 4 &&
1977             info_element->data[0] == 0x00 &&
1978             info_element->data[1] == 0x40 &&
1979             info_element->data[2] == 0x96 &&
1980             info_element->data[3] == 0x01) {
1981                 if (info_element->len == 6) {
1982                         memcpy(network->CcxRmState, &info_element->data[4], 2);
1983                         if (network->CcxRmState[0] != 0)
1984                                 network->bCcxRmEnable = true;
1985                         else
1986                                 network->bCcxRmEnable = false;
1987                         network->MBssidMask = network->CcxRmState[1] & 0x07;
1988                         if (network->MBssidMask != 0) {
1989                                 network->bMBssidValid = true;
1990                                 network->MBssidMask = 0xff <<
1991                                                       (network->MBssidMask);
1992                                 ether_addr_copy(network->MBssid,
1993                                                 network->bssid);
1994                                 network->MBssid[5] &= network->MBssidMask;
1995                         } else {
1996                                 network->bMBssidValid = false;
1997                         }
1998                 } else {
1999                         network->bCcxRmEnable = false;
2000                 }
2001         }
2002         if (info_element->len > 4  &&
2003             info_element->data[0] == 0x00 &&
2004             info_element->data[1] == 0x40 &&
2005             info_element->data[2] == 0x96 &&
2006             info_element->data[3] == 0x03) {
2007                 if (info_element->len == 5) {
2008                         network->bWithCcxVerNum = true;
2009                         network->BssCcxVerNumber = info_element->data[4];
2010                 } else {
2011                         network->bWithCcxVerNum = false;
2012                         network->BssCcxVerNumber = 0;
2013                 }
2014         }
2015         if (info_element->len > 4  &&
2016             info_element->data[0] == 0x00 &&
2017             info_element->data[1] == 0x50 &&
2018             info_element->data[2] == 0xf2 &&
2019             info_element->data[3] == 0x04) {
2020                 netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
2021                            info_element->len);
2022                 network->wzc_ie_len = min(info_element->len+2, MAX_WZC_IE_LEN);
2023                 memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
2024         }
2025 }
2026
2027 static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
2028                                      struct rtllib_network *network,
2029                                      u16 *tmp_htcap_len)
2030 {
2031         struct bss_ht *ht = &network->bssht;
2032
2033         *tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
2034         if (*tmp_htcap_len != 0) {
2035                 ht->bdHTSpecVer = HT_SPEC_VER_EWC;
2036                 ht->bdHTCapLen = min_t(u16, *tmp_htcap_len,
2037                                        sizeof(ht->bdHTCapBuf));
2038                 memcpy(ht->bdHTCapBuf, info_element->data, ht->bdHTCapLen);
2039
2040                 ht->bdSupportHT = true;
2041                 ht->bdHT1R = ((((struct ht_capab_ele *)
2042                                 ht->bdHTCapBuf))->MCS[1]) == 0;
2043
2044                 ht->bdBandWidth = (enum ht_channel_width)
2045                                              (((struct ht_capab_ele *)
2046                                              (ht->bdHTCapBuf))->ChlWidth);
2047         } else {
2048                 ht->bdSupportHT = false;
2049                 ht->bdHT1R = false;
2050                 ht->bdBandWidth = HT_CHANNEL_WIDTH_20;
2051         }
2052 }
2053
2054 int rtllib_parse_info_param(struct rtllib_device *ieee,
2055                 struct rtllib_info_element *info_element,
2056                 u16 length,
2057                 struct rtllib_network *network,
2058                 struct rtllib_rx_stats *stats)
2059 {
2060         u8 i;
2061         short offset;
2062         u16     tmp_htcap_len = 0;
2063         u16     tmp_htinfo_len = 0;
2064         char rates_str[64];
2065         char *p;
2066
2067         while (length >= sizeof(*info_element)) {
2068                 if (sizeof(*info_element) + info_element->len > length) {
2069                         netdev_dbg(ieee->dev,
2070                                    "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
2071                                    info_element->len + sizeof(*info_element),
2072                                    length, info_element->id);
2073                         /* We stop processing but don't return an error here
2074                          * because some misbehaviour APs break this rule. ie.
2075                          * Orinoco AP1000.
2076                          */
2077                         break;
2078                 }
2079
2080                 switch (info_element->id) {
2081                 case MFIE_TYPE_SSID:
2082                         if (rtllib_is_empty_essid(info_element->data,
2083                                                      info_element->len)) {
2084                                 network->flags |= NETWORK_EMPTY_ESSID;
2085                                 break;
2086                         }
2087
2088                         network->ssid_len = min(info_element->len,
2089                                                 (u8) IW_ESSID_MAX_SIZE);
2090                         memcpy(network->ssid, info_element->data,
2091                                network->ssid_len);
2092                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
2093                                 memset(network->ssid + network->ssid_len, 0,
2094                                        IW_ESSID_MAX_SIZE - network->ssid_len);
2095
2096                         netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
2097                                    network->ssid, network->ssid_len);
2098                         break;
2099
2100                 case MFIE_TYPE_RATES:
2101                         p = rates_str;
2102                         network->rates_len = min(info_element->len,
2103                                                  MAX_RATES_LENGTH);
2104                         for (i = 0; i < network->rates_len; i++) {
2105                                 network->rates[i] = info_element->data[i];
2106                                 p += snprintf(p, sizeof(rates_str) -
2107                                               (p - rates_str), "%02X ",
2108                                               network->rates[i]);
2109                                 if (rtllib_is_ofdm_rate
2110                                     (info_element->data[i])) {
2111                                         network->flags |= NETWORK_HAS_OFDM;
2112                                         if (info_element->data[i] &
2113                                             RTLLIB_BASIC_RATE_MASK)
2114                                                 network->flags &=
2115                                                     ~NETWORK_HAS_CCK;
2116                                 }
2117
2118                                 if (rtllib_is_cck_rate
2119                                     (info_element->data[i])) {
2120                                         network->flags |= NETWORK_HAS_CCK;
2121                                 }
2122                         }
2123
2124                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
2125                                    rates_str, network->rates_len);
2126                         break;
2127
2128                 case MFIE_TYPE_RATES_EX:
2129                         p = rates_str;
2130                         network->rates_ex_len = min(info_element->len,
2131                                                     MAX_RATES_EX_LENGTH);
2132                         for (i = 0; i < network->rates_ex_len; i++) {
2133                                 network->rates_ex[i] = info_element->data[i];
2134                                 p += snprintf(p, sizeof(rates_str) -
2135                                               (p - rates_str), "%02X ",
2136                                               network->rates_ex[i]);
2137                                 if (rtllib_is_ofdm_rate
2138                                     (info_element->data[i])) {
2139                                         network->flags |= NETWORK_HAS_OFDM;
2140                                         if (info_element->data[i] &
2141                                             RTLLIB_BASIC_RATE_MASK)
2142                                                 network->flags &=
2143                                                     ~NETWORK_HAS_CCK;
2144                                 }
2145                         }
2146
2147                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
2148                                    rates_str, network->rates_ex_len);
2149                         break;
2150
2151                 case MFIE_TYPE_DS_SET:
2152                         netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
2153                                    info_element->data[0]);
2154                         network->channel = info_element->data[0];
2155                         break;
2156
2157                 case MFIE_TYPE_FH_SET:
2158                         netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
2159                         break;
2160
2161                 case MFIE_TYPE_CF_SET:
2162                         netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
2163                         break;
2164
2165                 case MFIE_TYPE_TIM:
2166                         if (info_element->len < 4)
2167                                 break;
2168
2169                         network->tim.tim_count = info_element->data[0];
2170                         network->tim.tim_period = info_element->data[1];
2171
2172                         network->dtim_period = info_element->data[1];
2173                         if (ieee->state != RTLLIB_LINKED)
2174                                 break;
2175                         network->last_dtim_sta_time = jiffies;
2176
2177                         network->dtim_data = RTLLIB_DTIM_VALID;
2178
2179
2180                         if (info_element->data[2] & 1)
2181                                 network->dtim_data |= RTLLIB_DTIM_MBCAST;
2182
2183                         offset = (info_element->data[2] >> 1)*2;
2184
2185
2186                         if (ieee->assoc_id < 8*offset ||
2187                             ieee->assoc_id > 8*(offset + info_element->len - 3))
2188                                 break;
2189
2190                         offset = (ieee->assoc_id / 8) - offset;
2191                         if (info_element->data[3 + offset] &
2192                            (1 << (ieee->assoc_id % 8)))
2193                                 network->dtim_data |= RTLLIB_DTIM_UCAST;
2194
2195                         network->listen_interval = network->dtim_period;
2196                         break;
2197
2198                 case MFIE_TYPE_ERP:
2199                         network->erp_value = info_element->data[0];
2200                         network->flags |= NETWORK_HAS_ERP_VALUE;
2201                         netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
2202                                    network->erp_value);
2203                         break;
2204                 case MFIE_TYPE_IBSS_SET:
2205                         network->atim_window = info_element->data[0];
2206                         netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
2207                                    network->atim_window);
2208                         break;
2209
2210                 case MFIE_TYPE_CHALLENGE:
2211                         netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
2212                         break;
2213
2214                 case MFIE_TYPE_GENERIC:
2215                         netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
2216                                    info_element->len);
2217
2218                         rtllib_parse_mife_generic(ieee, info_element, network,
2219                                                   &tmp_htcap_len,
2220                                                   &tmp_htinfo_len);
2221                         break;
2222
2223                 case MFIE_TYPE_RSN:
2224                         netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
2225                                    info_element->len);
2226                         network->rsn_ie_len = min(info_element->len + 2,
2227                                                   MAX_WPA_IE_LEN);
2228                         memcpy(network->rsn_ie, info_element,
2229                                network->rsn_ie_len);
2230                         break;
2231
2232                 case MFIE_TYPE_HT_CAP:
2233                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
2234                                    info_element->len);
2235
2236                         rtllib_parse_mfie_ht_cap(info_element, network,
2237                                                  &tmp_htcap_len);
2238                         break;
2239
2240
2241                 case MFIE_TYPE_HT_INFO:
2242                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
2243                                    info_element->len);
2244                         tmp_htinfo_len = min_t(u8, info_element->len,
2245                                                MAX_IE_LEN);
2246                         if (tmp_htinfo_len) {
2247                                 network->bssht.bdHTSpecVer = HT_SPEC_VER_IEEE;
2248                                 network->bssht.bdHTInfoLen = tmp_htinfo_len >
2249                                         sizeof(network->bssht.bdHTInfoBuf) ?
2250                                         sizeof(network->bssht.bdHTInfoBuf) :
2251                                         tmp_htinfo_len;
2252                                 memcpy(network->bssht.bdHTInfoBuf,
2253                                        info_element->data,
2254                                        network->bssht.bdHTInfoLen);
2255                         }
2256                         break;
2257
2258                 case MFIE_TYPE_AIRONET:
2259                         netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
2260                                    info_element->len);
2261                         if (info_element->len > IE_CISCO_FLAG_POSITION) {
2262                                 network->bWithAironetIE = true;
2263
2264                                 if ((info_element->data[IE_CISCO_FLAG_POSITION]
2265                                      & SUPPORT_CKIP_MIC) ||
2266                                      (info_element->data[IE_CISCO_FLAG_POSITION]
2267                                      & SUPPORT_CKIP_PK))
2268                                         network->bCkipSupported = true;
2269                                 else
2270                                         network->bCkipSupported = false;
2271                         } else {
2272                                 network->bWithAironetIE = false;
2273                                 network->bCkipSupported = false;
2274                         }
2275                         break;
2276                 case MFIE_TYPE_QOS_PARAMETER:
2277                         netdev_err(ieee->dev,
2278                                    "QoS Error need to parse QOS_PARAMETER IE\n");
2279                         break;
2280
2281                 case MFIE_TYPE_COUNTRY:
2282                         netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
2283                                    info_element->len);
2284                         rtllib_extract_country_ie(ieee, info_element, network,
2285                                                   network->bssid);
2286                         break;
2287 /* TODO */
2288                 default:
2289                         netdev_dbg(ieee->dev,
2290                                    "Unsupported info element: %s (%d)\n",
2291                                    get_info_element_string(info_element->id),
2292                                    info_element->id);
2293                         break;
2294                 }
2295
2296                 length -= sizeof(*info_element) + info_element->len;
2297                 info_element =
2298                     (struct rtllib_info_element *)&info_element->
2299                     data[info_element->len];
2300         }
2301
2302         if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2303             !network->cisco_cap_exist && !network->ralink_cap_exist &&
2304             !network->bssht.bdRT2RTAggregation)
2305                 network->unknown_cap_exist = true;
2306         else
2307                 network->unknown_cap_exist = false;
2308         return 0;
2309 }
2310
2311 static long rtllib_translate_todbm(u8 signal_strength_index)
2312 {
2313         long    signal_power;
2314
2315         signal_power = (long)((signal_strength_index + 1) >> 1);
2316         signal_power -= 95;
2317
2318         return signal_power;
2319 }
2320
2321 static inline int rtllib_network_init(
2322         struct rtllib_device *ieee,
2323         struct rtllib_probe_response *beacon,
2324         struct rtllib_network *network,
2325         struct rtllib_rx_stats *stats)
2326 {
2327         memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2328
2329         /* Pull out fixed field data */
2330         ether_addr_copy(network->bssid, beacon->header.addr3);
2331         network->capability = le16_to_cpu(beacon->capability);
2332         network->last_scanned = jiffies;
2333         network->time_stamp[0] = beacon->time_stamp[0];
2334         network->time_stamp[1] = beacon->time_stamp[1];
2335         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
2336         /* Where to pull this? beacon->listen_interval;*/
2337         network->listen_interval = 0x0A;
2338         network->rates_len = network->rates_ex_len = 0;
2339         network->ssid_len = 0;
2340         network->hidden_ssid_len = 0;
2341         memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2342         network->flags = 0;
2343         network->atim_window = 0;
2344         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2345             0x3 : 0x0;
2346         network->berp_info_valid = false;
2347         network->broadcom_cap_exist = false;
2348         network->ralink_cap_exist = false;
2349         network->atheros_cap_exist = false;
2350         network->cisco_cap_exist = false;
2351         network->unknown_cap_exist = false;
2352         network->realtek_cap_exit = false;
2353         network->marvell_cap_exist = false;
2354         network->airgo_cap_exist = false;
2355         network->Turbo_Enable = 0;
2356         network->SignalStrength = stats->SignalStrength;
2357         network->RSSI = stats->SignalStrength;
2358         network->CountryIeLen = 0;
2359         memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2360         HTInitializeBssDesc(&network->bssht);
2361         if (stats->freq == RTLLIB_52GHZ_BAND) {
2362                 /* for A band (No DS info) */
2363                 network->channel = stats->received_channel;
2364         } else
2365                 network->flags |= NETWORK_HAS_CCK;
2366
2367         network->wpa_ie_len = 0;
2368         network->rsn_ie_len = 0;
2369         network->wzc_ie_len = 0;
2370
2371         if (rtllib_parse_info_param(ieee,
2372                         beacon->info_element,
2373                         (stats->len - sizeof(*beacon)),
2374                         network,
2375                         stats))
2376                 return 1;
2377
2378         network->mode = 0;
2379         if (stats->freq == RTLLIB_52GHZ_BAND)
2380                 network->mode = IEEE_A;
2381         else {
2382                 if (network->flags & NETWORK_HAS_OFDM)
2383                         network->mode |= IEEE_G;
2384                 if (network->flags & NETWORK_HAS_CCK)
2385                         network->mode |= IEEE_B;
2386         }
2387
2388         if (network->mode == 0) {
2389                 netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
2390                            escape_essid(network->ssid, network->ssid_len),
2391                            network->bssid);
2392                 return 1;
2393         }
2394
2395         if (network->bssht.bdSupportHT) {
2396                 if (network->mode == IEEE_A)
2397                         network->mode = IEEE_N_5G;
2398                 else if (network->mode & (IEEE_G | IEEE_B))
2399                         network->mode = IEEE_N_24G;
2400         }
2401         if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2402                 network->flags |= NETWORK_EMPTY_ESSID;
2403         stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2404         stats->noise = rtllib_translate_todbm((u8)(100-stats->signal)) - 25;
2405
2406         memcpy(&network->stats, stats, sizeof(network->stats));
2407
2408         return 0;
2409 }
2410
2411 static inline int is_same_network(struct rtllib_network *src,
2412                                   struct rtllib_network *dst, u8 ssidbroad)
2413 {
2414         /* A network is only a duplicate if the channel, BSSID, ESSID
2415          * and the capability field (in particular IBSS and BSS) all match.
2416          * We treat all <hidden> with the same BSSID and channel
2417          * as one network
2418          */
2419         return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2420                 (src->channel == dst->channel) &&
2421                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2422                 (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2423                 (!ssidbroad)) &&
2424                 ((src->capability & WLAN_CAPABILITY_IBSS) ==
2425                 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2426                 ((src->capability & WLAN_CAPABILITY_ESS) ==
2427                 (dst->capability & WLAN_CAPABILITY_ESS)));
2428 }
2429
2430
2431 static inline void update_network(struct rtllib_device *ieee,
2432                                   struct rtllib_network *dst,
2433                                   struct rtllib_network *src)
2434 {
2435         int qos_active;
2436         u8 old_param;
2437
2438         memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2439         dst->capability = src->capability;
2440         memcpy(dst->rates, src->rates, src->rates_len);
2441         dst->rates_len = src->rates_len;
2442         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2443         dst->rates_ex_len = src->rates_ex_len;
2444         if (src->ssid_len > 0) {
2445                 if (dst->ssid_len == 0) {
2446                         memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2447                         dst->hidden_ssid_len = src->ssid_len;
2448                         memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2449                 } else {
2450                         memset(dst->ssid, 0, dst->ssid_len);
2451                         dst->ssid_len = src->ssid_len;
2452                         memcpy(dst->ssid, src->ssid, src->ssid_len);
2453                 }
2454         }
2455         dst->mode = src->mode;
2456         dst->flags = src->flags;
2457         dst->time_stamp[0] = src->time_stamp[0];
2458         dst->time_stamp[1] = src->time_stamp[1];
2459         if (src->flags & NETWORK_HAS_ERP_VALUE) {
2460                 dst->erp_value = src->erp_value;
2461                 dst->berp_info_valid = src->berp_info_valid = true;
2462         }
2463         dst->beacon_interval = src->beacon_interval;
2464         dst->listen_interval = src->listen_interval;
2465         dst->atim_window = src->atim_window;
2466         dst->dtim_period = src->dtim_period;
2467         dst->dtim_data = src->dtim_data;
2468         dst->last_dtim_sta_time = src->last_dtim_sta_time;
2469         memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2470
2471         dst->bssht.bdSupportHT = src->bssht.bdSupportHT;
2472         dst->bssht.bdRT2RTAggregation = src->bssht.bdRT2RTAggregation;
2473         dst->bssht.bdHTCapLen = src->bssht.bdHTCapLen;
2474         memcpy(dst->bssht.bdHTCapBuf, src->bssht.bdHTCapBuf,
2475                src->bssht.bdHTCapLen);
2476         dst->bssht.bdHTInfoLen = src->bssht.bdHTInfoLen;
2477         memcpy(dst->bssht.bdHTInfoBuf, src->bssht.bdHTInfoBuf,
2478                src->bssht.bdHTInfoLen);
2479         dst->bssht.bdHTSpecVer = src->bssht.bdHTSpecVer;
2480         dst->bssht.bdRT2RTLongSlotTime = src->bssht.bdRT2RTLongSlotTime;
2481         dst->broadcom_cap_exist = src->broadcom_cap_exist;
2482         dst->ralink_cap_exist = src->ralink_cap_exist;
2483         dst->atheros_cap_exist = src->atheros_cap_exist;
2484         dst->realtek_cap_exit = src->realtek_cap_exit;
2485         dst->marvell_cap_exist = src->marvell_cap_exist;
2486         dst->cisco_cap_exist = src->cisco_cap_exist;
2487         dst->airgo_cap_exist = src->airgo_cap_exist;
2488         dst->unknown_cap_exist = src->unknown_cap_exist;
2489         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2490         dst->wpa_ie_len = src->wpa_ie_len;
2491         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2492         dst->rsn_ie_len = src->rsn_ie_len;
2493         memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2494         dst->wzc_ie_len = src->wzc_ie_len;
2495
2496         dst->last_scanned = jiffies;
2497         /* qos related parameters */
2498         qos_active = dst->qos_data.active;
2499         old_param = dst->qos_data.param_count;
2500         dst->qos_data.supported = src->qos_data.supported;
2501         if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2502                 memcpy(&dst->qos_data, &src->qos_data,
2503                        sizeof(struct rtllib_qos_data));
2504         if (dst->qos_data.supported == 1) {
2505                 if (dst->ssid_len)
2506                         netdev_dbg(ieee->dev,
2507                                    "QoS the network %s is QoS supported\n",
2508                                    dst->ssid);
2509                 else
2510                         netdev_dbg(ieee->dev,
2511                                    "QoS the network is QoS supported\n");
2512         }
2513         dst->qos_data.active = qos_active;
2514         dst->qos_data.old_param_count = old_param;
2515
2516         dst->wmm_info = src->wmm_info;
2517         if (src->wmm_param[0].ac_aci_acm_aifsn ||
2518            src->wmm_param[1].ac_aci_acm_aifsn ||
2519            src->wmm_param[2].ac_aci_acm_aifsn ||
2520            src->wmm_param[3].ac_aci_acm_aifsn)
2521                 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2522
2523         dst->SignalStrength = src->SignalStrength;
2524         dst->RSSI = src->RSSI;
2525         dst->Turbo_Enable = src->Turbo_Enable;
2526
2527         dst->CountryIeLen = src->CountryIeLen;
2528         memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2529
2530         dst->bWithAironetIE = src->bWithAironetIE;
2531         dst->bCkipSupported = src->bCkipSupported;
2532         memcpy(dst->CcxRmState, src->CcxRmState, 2);
2533         dst->bCcxRmEnable = src->bCcxRmEnable;
2534         dst->MBssidMask = src->MBssidMask;
2535         dst->bMBssidValid = src->bMBssidValid;
2536         memcpy(dst->MBssid, src->MBssid, 6);
2537         dst->bWithCcxVerNum = src->bWithCcxVerNum;
2538         dst->BssCcxVerNumber = src->BssCcxVerNumber;
2539 }
2540
2541 static inline int is_beacon(u16 fc)
2542 {
2543         return (WLAN_FC_GET_STYPE(fc) == RTLLIB_STYPE_BEACON);
2544 }
2545
2546 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2547 {
2548         if (channel > MAX_CHANNEL_NUMBER) {
2549                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2550                 return 0;
2551         }
2552
2553         if (rtllib->active_channel_map[channel] == 2)
2554                 return 1;
2555
2556         return 0;
2557 }
2558
2559 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2560 {
2561         if (channel > MAX_CHANNEL_NUMBER) {
2562                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2563                 return 0;
2564         }
2565         if (rtllib->active_channel_map[channel] > 0)
2566                 return 1;
2567
2568         return 0;
2569 }
2570 EXPORT_SYMBOL(rtllib_legal_channel);
2571
2572 static inline void rtllib_process_probe_response(
2573         struct rtllib_device *ieee,
2574         struct rtllib_probe_response *beacon,
2575         struct rtllib_rx_stats *stats)
2576 {
2577         struct rtllib_network *target;
2578         struct rtllib_network *oldest = NULL;
2579         struct rtllib_info_element *info_element = &beacon->info_element[0];
2580         unsigned long flags;
2581         short renew;
2582         struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2583                                                  GFP_ATOMIC);
2584         u16 frame_ctl = le16_to_cpu(beacon->header.frame_ctl);
2585
2586         if (!network)
2587                 return;
2588
2589         netdev_dbg(ieee->dev,
2590                    "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2591                    escape_essid(info_element->data, info_element->len),
2592                    beacon->header.addr3,
2593                    (le16_to_cpu(beacon->capability) & (1<<0xf)) ? '1' : '0',
2594                    (le16_to_cpu(beacon->capability) & (1<<0xe)) ? '1' : '0',
2595                    (le16_to_cpu(beacon->capability) & (1<<0xd)) ? '1' : '0',
2596                    (le16_to_cpu(beacon->capability) & (1<<0xc)) ? '1' : '0',
2597                    (le16_to_cpu(beacon->capability) & (1<<0xb)) ? '1' : '0',
2598                    (le16_to_cpu(beacon->capability) & (1<<0xa)) ? '1' : '0',
2599                    (le16_to_cpu(beacon->capability) & (1<<0x9)) ? '1' : '0',
2600                    (le16_to_cpu(beacon->capability) & (1<<0x8)) ? '1' : '0',
2601                    (le16_to_cpu(beacon->capability) & (1<<0x7)) ? '1' : '0',
2602                    (le16_to_cpu(beacon->capability) & (1<<0x6)) ? '1' : '0',
2603                    (le16_to_cpu(beacon->capability) & (1<<0x5)) ? '1' : '0',
2604                    (le16_to_cpu(beacon->capability) & (1<<0x4)) ? '1' : '0',
2605                    (le16_to_cpu(beacon->capability) & (1<<0x3)) ? '1' : '0',
2606                    (le16_to_cpu(beacon->capability) & (1<<0x2)) ? '1' : '0',
2607                    (le16_to_cpu(beacon->capability) & (1<<0x1)) ? '1' : '0',
2608                    (le16_to_cpu(beacon->capability) & (1<<0x0)) ? '1' : '0');
2609
2610         if (rtllib_network_init(ieee, beacon, network, stats)) {
2611                 netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
2612                            escape_essid(info_element->data, info_element->len),
2613                            beacon->header.addr3,
2614                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2615                 goto free_network;
2616         }
2617
2618
2619         if (!rtllib_legal_channel(ieee, network->channel))
2620                 goto free_network;
2621
2622         if (WLAN_FC_GET_STYPE(frame_ctl) == RTLLIB_STYPE_PROBE_RESP) {
2623                 if (IsPassiveChannel(ieee, network->channel)) {
2624                         netdev_info(ieee->dev,
2625                                     "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
2626                                     network->channel);
2627                         goto free_network;
2628                 }
2629         }
2630
2631         /* The network parsed correctly -- so now we scan our known networks
2632          * to see if we can find it in our list.
2633          *
2634          * NOTE:  This search is definitely not optimized.  Once its doing
2635          *      the "right thing" we'll optimize it for efficiency if
2636          *      necessary
2637          */
2638
2639         /* Search for this entry in the list and update it if it is
2640          * already there.
2641          */
2642
2643         spin_lock_irqsave(&ieee->lock, flags);
2644         if (is_same_network(&ieee->current_network, network,
2645            (network->ssid_len ? 1 : 0))) {
2646                 update_network(ieee, &ieee->current_network, network);
2647                 if ((ieee->current_network.mode == IEEE_N_24G ||
2648                      ieee->current_network.mode == IEEE_G)
2649                      && ieee->current_network.berp_info_valid) {
2650                         if (ieee->current_network.erp_value & ERP_UseProtection)
2651                                 ieee->current_network.buseprotection = true;
2652                         else
2653                                 ieee->current_network.buseprotection = false;
2654                 }
2655                 if (is_beacon(frame_ctl)) {
2656                         if (ieee->state >= RTLLIB_LINKED)
2657                                 ieee->LinkDetectInfo.NumRecvBcnInPeriod++;
2658                 }
2659         }
2660         list_for_each_entry(target, &ieee->network_list, list) {
2661                 if (is_same_network(target, network,
2662                    (target->ssid_len ? 1 : 0)))
2663                         break;
2664                 if ((oldest == NULL) ||
2665                     (target->last_scanned < oldest->last_scanned))
2666                         oldest = target;
2667         }
2668
2669         /* If we didn't find a match, then get a new network slot to initialize
2670          * with this beacon's information
2671          */
2672         if (&target->list == &ieee->network_list) {
2673                 if (list_empty(&ieee->network_free_list)) {
2674                         /* If there are no more slots, expire the oldest */
2675                         list_del(&oldest->list);
2676                         target = oldest;
2677                         netdev_dbg(ieee->dev,
2678                                    "Expired '%s' ( %pM) from network list.\n",
2679                                    escape_essid(target->ssid, target->ssid_len),
2680                                    target->bssid);
2681                 } else {
2682                         /* Otherwise just pull from the free list */
2683                         target = list_entry(ieee->network_free_list.next,
2684                                             struct rtllib_network, list);
2685                         list_del(ieee->network_free_list.next);
2686                 }
2687
2688                 netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
2689                            escape_essid(network->ssid, network->ssid_len),
2690                            network->bssid,
2691                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2692
2693                 memcpy(target, network, sizeof(*target));
2694                 list_add_tail(&target->list, &ieee->network_list);
2695                 if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2696                         rtllib_softmac_new_net(ieee, network);
2697         } else {
2698                 netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
2699                            escape_essid(target->ssid, target->ssid_len),
2700                            target->bssid,
2701                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2702
2703                 /* we have an entry and we are going to update it. But this
2704                  *  entry may be already expired. In this case we do the same
2705                  * as we found a new net and call the new_net handler
2706                  */
2707                 renew = !time_after(target->last_scanned + ieee->scan_age,
2708                                     jiffies);
2709                 if ((!target->ssid_len) &&
2710                     (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2711                     || ((ieee->current_network.ssid_len == network->ssid_len) &&
2712                     (strncmp(ieee->current_network.ssid, network->ssid,
2713                     network->ssid_len) == 0) &&
2714                     (ieee->state == RTLLIB_NOLINK))))
2715                         renew = 1;
2716                 update_network(ieee, target, network);
2717                 if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2718                         rtllib_softmac_new_net(ieee, network);
2719         }
2720
2721         spin_unlock_irqrestore(&ieee->lock, flags);
2722         if (is_beacon(frame_ctl) &&
2723             is_same_network(&ieee->current_network, network,
2724             (network->ssid_len ? 1 : 0)) &&
2725             (ieee->state == RTLLIB_LINKED)) {
2726                 if (ieee->handle_beacon != NULL)
2727                         ieee->handle_beacon(ieee->dev, beacon,
2728                                             &ieee->current_network);
2729         }
2730 free_network:
2731         kfree(network);
2732 }
2733
2734 static void rtllib_rx_mgt(struct rtllib_device *ieee,
2735                           struct sk_buff *skb,
2736                           struct rtllib_rx_stats *stats)
2737 {
2738         struct rtllib_hdr_4addr *header = (struct rtllib_hdr_4addr *)skb->data;
2739
2740         if ((WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2741             RTLLIB_STYPE_PROBE_RESP) &&
2742             (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2743             RTLLIB_STYPE_BEACON))
2744                 ieee->last_rx_ps_time = jiffies;
2745
2746         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
2747
2748         case RTLLIB_STYPE_BEACON:
2749                 netdev_dbg(ieee->dev, "received BEACON (%d)\n",
2750                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2751                 rtllib_process_probe_response(
2752                                 ieee, (struct rtllib_probe_response *)header,
2753                                 stats);
2754
2755                 if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2756                     ieee->iw_mode == IW_MODE_INFRA &&
2757                     ieee->state == RTLLIB_LINKED))
2758                         tasklet_schedule(&ieee->ps_task);
2759
2760                 break;
2761
2762         case RTLLIB_STYPE_PROBE_RESP:
2763                 netdev_dbg(ieee->dev, "received PROBE RESPONSE (%d)\n",
2764                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2765                 rtllib_process_probe_response(ieee,
2766                               (struct rtllib_probe_response *)header, stats);
2767                 break;
2768         case RTLLIB_STYPE_PROBE_REQ:
2769                 netdev_dbg(ieee->dev, "received PROBE RESQUEST (%d)\n",
2770                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2771                 if ((ieee->softmac_features & IEEE_SOFTMAC_PROBERS) &&
2772                     ((ieee->iw_mode == IW_MODE_ADHOC ||
2773                     ieee->iw_mode == IW_MODE_MASTER) &&
2774                     ieee->state == RTLLIB_LINKED))
2775                         rtllib_rx_probe_rq(ieee, skb);
2776                 break;
2777         }
2778 }