drivers/staging/rtl8192e/rtllib_rx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Original code based Host AP (software wireless LAN access point) driver
   4  * for Intersil Prism2/2.5/3 - hostap.o module, common routines
   5  *
   6  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   7  * <jkmaline@cc.hut.fi>
   8  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   9  * Copyright (c) 2004, Intel Corporation
  10  *
  11  * Few modifications for Realtek's Wi-Fi drivers by
  12  * Andrea Merello <andrea.merello@gmail.com>
  13  *
  14  * A special thanks goes to Realtek for their support !
  15  */
  16 #include <linux/compiler.h>
  17 #include <linux/errno.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/in6.h>
  20 #include <linux/in.h>
  21 #include <linux/ip.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/pci.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <linux/tcp.h>
  30 #include <linux/types.h>
  31 #include <linux/wireless.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/ctype.h>
  35
  36 #include "rtllib.h"
  37
  38 static void rtllib_rx_mgt(struct rtllib_device *ieee, struct sk_buff *skb,
  39                           struct rtllib_rx_stats *stats);
  40
  41 static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
  42                                      struct sk_buff *skb,
  43                                      struct rtllib_rx_stats *rx_status,
  44                                      size_t hdr_length)
  45 {
  46         skb->dev = ieee->dev;
  47         skb_reset_mac_header(skb);
  48         skb_pull(skb, hdr_length);
  49         skb->pkt_type = PACKET_OTHERHOST;
  50         skb->protocol = htons(ETH_P_80211_RAW);
  51         memset(skb->cb, 0, sizeof(skb->cb));
  52         netif_rx(skb);
  53 }
  54
  55 /* Called only as a tasklet (software IRQ) */
  56 static struct rtllib_frag_entry *
  57 rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
  58                           unsigned int frag, u8 tid, u8 *src, u8 *dst)
  59 {
  60         struct rtllib_frag_entry *entry;
  61         int i;
  62
  63         for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
  64                 entry = &ieee->frag_cache[tid][i];
  65                 if (entry->skb &&
  66                     time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
  67                         netdev_dbg(ieee->dev,
  68                                    "expiring fragment cache entry seq=%u last_frag=%u\n",
  69                                    entry->seq, entry->last_frag);
  70                         dev_kfree_skb_any(entry->skb);
  71                         entry->skb = NULL;
  72                 }
  73
  74                 if (entry->skb && entry->seq == seq &&
  75                     (entry->last_frag + 1 == frag || frag == -1) &&
  76                     memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
  77                     memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
  78                         return entry;
  79         }
  80
  81         return NULL;
  82 }
  83
  84 /* Called only as a tasklet (software IRQ) */
  85 static struct sk_buff *
  86 rtllib_frag_cache_get(struct rtllib_device *ieee,
  87                          struct ieee80211_hdr *hdr)
  88 {
  89         struct sk_buff *skb = NULL;
  90         u16 fc = le16_to_cpu(hdr->frame_control);
  91         u16 sc = le16_to_cpu(hdr->seq_ctrl);
  92         unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
  93         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
  94         struct rtllib_frag_entry *entry;
  95         struct ieee80211_qos_hdr *hdr_3addrqos;
  96         struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
  97         u8 tid;
  98
  99         if (ieee80211_has_a4(hdr->frame_control) &&
 100             RTLLIB_QOS_HAS_SEQ(fc)) {
 101                 hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
 102                 tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 103                 tid = UP2AC(tid);
 104                 tid++;
 105         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 106                 hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
 107                 tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 108                 tid = UP2AC(tid);
 109                 tid++;
 110         } else {
 111                 tid = 0;
 112         }
 113
 114         if (frag == 0) {
 115                 /* Reserve enough space to fit maximum frame length */
 116                 skb = dev_alloc_skb(ieee->dev->mtu +
 117                                     sizeof(struct ieee80211_hdr) +
 118                                     8 /* LLC */ +
 119                                     2 /* alignment */ +
 120                                     8 /* WEP */ +
 121                                     ETH_ALEN /* WDS */ +
 122                                     /* QOS Control */
 123                                     (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0));
 124                 if (!skb)
 125                         return NULL;
 126
 127                 entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
 128                 ieee->frag_next_idx[tid]++;
 129                 if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
 130                         ieee->frag_next_idx[tid] = 0;
 131
 132                 if (entry->skb)
 133                         dev_kfree_skb_any(entry->skb);
 134
 135                 entry->first_frag_time = jiffies;
 136                 entry->seq = seq;
 137                 entry->last_frag = frag;
 138                 entry->skb = skb;
 139                 ether_addr_copy(entry->src_addr, hdr->addr2);
 140                 ether_addr_copy(entry->dst_addr, hdr->addr1);
 141         } else {
 142                 /* received a fragment of a frame for which the head fragment
 143                  * should have already been received
 144                  */
 145                 entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
 146                                                   hdr->addr1);
 147                 if (entry) {
 148                         entry->last_frag = frag;
 149                         skb = entry->skb;
 150                 }
 151         }
 152
 153         return skb;
 154 }
 155
 156 /* Called only as a tasklet (software IRQ) */
 157 static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
 158                                            struct ieee80211_hdr *hdr)
 159 {
 160         u16 fc = le16_to_cpu(hdr->frame_control);
 161         u16 sc = le16_to_cpu(hdr->seq_ctrl);
 162         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
 163         struct rtllib_frag_entry *entry;
 164         struct ieee80211_qos_hdr *hdr_3addrqos;
 165         struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
 166         u8 tid;
 167
 168         if (ieee80211_has_a4(hdr->frame_control) &&
 169             RTLLIB_QOS_HAS_SEQ(fc)) {
 170                 hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)hdr;
 171                 tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 172                 tid = UP2AC(tid);
 173                 tid++;
 174         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 175                 hdr_3addrqos = (struct ieee80211_qos_hdr *)hdr;
 176                 tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 177                 tid = UP2AC(tid);
 178                 tid++;
 179         } else {
 180                 tid = 0;
 181         }
 182
 183         entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
 184                                           hdr->addr1);
 185
 186         if (!entry) {
 187                 netdev_dbg(ieee->dev,
 188                            "Couldn't invalidate fragment cache entry (seq=%u)\n",
 189                            seq);
 190                 return -1;
 191         }
 192
 193         entry->skb = NULL;
 194         return 0;
 195 }
 196
 197 /* rtllib_rx_frame_mgtmt
 198  *
 199  * Responsible for handling management control frames
 200  *
 201  * Called by rtllib_rx
 202  */
 203 static inline int
 204 rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
 205                         struct rtllib_rx_stats *rx_stats, u16 type,
 206                         u16 stype)
 207 {
 208         /* On the struct stats definition there is written that
 209          * this is not mandatory.... but seems that the probe
 210          * response parser uses it
 211          */
 212         struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)skb->data;
 213
 214         rx_stats->len = skb->len;
 215         rtllib_rx_mgt(ieee, skb, rx_stats);
 216         if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
 217                 dev_kfree_skb_any(skb);
 218                 return 0;
 219         }
 220         rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
 221
 222         dev_kfree_skb_any(skb);
 223
 224         return 0;
 225 }
 226
 227 /* No encapsulation header if EtherType < 0x600 (=length) */
 228
 229 /* Called by rtllib_rx_frame_decrypt */
 230 static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
 231                                     struct sk_buff *skb, size_t hdrlen)
 232 {
 233         struct net_device *dev = ieee->dev;
 234         u16 fc, ethertype;
 235         struct ieee80211_hdr *hdr;
 236         u8 *pos;
 237
 238         if (skb->len < 24)
 239                 return 0;
 240
 241         hdr = (struct ieee80211_hdr *)skb->data;
 242         fc = le16_to_cpu(hdr->frame_control);
 243
 244         /* check that the frame is unicast frame to us */
 245         if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 246             IEEE80211_FCTL_TODS &&
 247             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
 248             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
 249                 /* ToDS frame with own addr BSSID and DA */
 250         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 251                    IEEE80211_FCTL_FROMDS &&
 252                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
 253                 /* FromDS frame with own addr as DA */
 254         } else {
 255                 return 0;
 256         }
 257
 258         if (skb->len < 24 + 8)
 259                 return 0;
 260
 261         /* check for port access entity Ethernet type */
 262         pos = skb->data + hdrlen;
 263         ethertype = (pos[6] << 8) | pos[7];
 264         if (ethertype == ETH_P_PAE)
 265                 return 1;
 266
 267         return 0;
 268 }
 269
 270 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 271 static inline int
 272 rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
 273                         struct lib80211_crypt_data *crypt)
 274 {
 275         struct ieee80211_hdr *hdr;
 276         int res, hdrlen;
 277
 278         if (!crypt || !crypt->ops->decrypt_mpdu)
 279                 return 0;
 280
 281         if (ieee->hwsec_active) {
 282                 struct cb_desc *tcb_desc = (struct cb_desc *)
 283                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 284
 285                 tcb_desc->bHwSec = 1;
 286
 287                 if (ieee->need_sw_enc)
 288                         tcb_desc->bHwSec = 0;
 289         }
 290
 291         hdr = (struct ieee80211_hdr *)skb->data;
 292         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));
 293
 294         atomic_inc(&crypt->refcnt);
 295         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 296         atomic_dec(&crypt->refcnt);
 297         if (res < 0) {
 298                 netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
 299                            hdr->addr2, res);
 300                 if (res == -2)
 301                         netdev_dbg(ieee->dev,
 302                                    "Decryption failed ICV mismatch (key %d)\n",
 303                                    skb->data[hdrlen + 3] >> 6);
 304                 return -1;
 305         }
 306
 307         return res;
 308 }
 309
 310 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 311 static inline int
 312 rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
 313                              int keyidx, struct lib80211_crypt_data *crypt)
 314 {
 315         struct ieee80211_hdr *hdr;
 316         int res, hdrlen;
 317
 318         if (!crypt || !crypt->ops->decrypt_msdu)
 319                 return 0;
 320         if (ieee->hwsec_active) {
 321                 struct cb_desc *tcb_desc = (struct cb_desc *)
 322                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 323
 324                 tcb_desc->bHwSec = 1;
 325
 326                 if (ieee->need_sw_enc)
 327                         tcb_desc->bHwSec = 0;
 328         }
 329
 330         hdr = (struct ieee80211_hdr *)skb->data;
 331         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_control));
 332
 333         atomic_inc(&crypt->refcnt);
 334         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 335         atomic_dec(&crypt->refcnt);
 336         if (res < 0) {
 337                 netdev_dbg(ieee->dev,
 338                            "MSDU decryption/MIC verification failed (SA= %pM keyidx=%d)\n",
 339                            hdr->addr2, keyidx);
 340                 return -1;
 341         }
 342
 343         return 0;
 344 }
 345
 346 /* this function is stolen from ipw2200 driver*/
 347 #define IEEE_PACKET_RETRY_TIME (5 * HZ)
 348 static int is_duplicate_packet(struct rtllib_device *ieee,
 349                                       struct ieee80211_hdr *header)
 350 {
 351         u16 fc = le16_to_cpu(header->frame_control);
 352         u16 sc = le16_to_cpu(header->seq_ctrl);
 353         u16 seq = WLAN_GET_SEQ_SEQ(sc);
 354         u16 frag = WLAN_GET_SEQ_FRAG(sc);
 355         u16 *last_seq, *last_frag;
 356         unsigned long *last_time;
 357         struct ieee80211_qos_hdr *hdr_3addrqos;
 358         struct ieee80211_qos_hdr_4addr *hdr_4addrqos;
 359         u8 tid;
 360
 361         if (ieee80211_has_a4(header->frame_control) &&
 362             RTLLIB_QOS_HAS_SEQ(fc)) {
 363                 hdr_4addrqos = (struct ieee80211_qos_hdr_4addr *)header;
 364                 tid = le16_to_cpu(hdr_4addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 365                 tid = UP2AC(tid);
 366                 tid++;
 367         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 368                 hdr_3addrqos = (struct ieee80211_qos_hdr *)header;
 369                 tid = le16_to_cpu(hdr_3addrqos->qos_ctrl) & RTLLIB_QCTL_TID;
 370                 tid = UP2AC(tid);
 371                 tid++;
 372         } else {
 373                 tid = 0;
 374         }
 375
 376         switch (ieee->iw_mode) {
 377         case IW_MODE_INFRA:
 378                 last_seq = &ieee->last_rxseq_num[tid];
 379                 last_frag = &ieee->last_rxfrag_num[tid];
 380                 last_time = &ieee->last_packet_time[tid];
 381                 break;
 382         default:
 383                 return 0;
 384         }
 385
 386         if ((*last_seq == seq) &&
 387             time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
 388                 if (*last_frag == frag)
 389                         goto drop;
 390                 if (*last_frag + 1 != frag)
 391                         /* out-of-order fragment */
 392                         goto drop;
 393         } else {
 394                 *last_seq = seq;
 395         }
 396
 397         *last_frag = frag;
 398         *last_time = jiffies;
 399         return 0;
 400
 401 drop:
 402
 403         return 1;
 404 }
 405
 406 static bool AddReorderEntry(struct rx_ts_record *ts,
 407                             struct rx_reorder_entry *pReorderEntry)
 408 {
 409         struct list_head *pList = &ts->rx_pending_pkt_list;
 410
 411         while (pList->next != &ts->rx_pending_pkt_list) {
 412                 if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
 413                     list_entry(pList->next, struct rx_reorder_entry,
 414                     list))->SeqNum))
 415                         pList = pList->next;
 416                 else if (SN_EQUAL(pReorderEntry->SeqNum,
 417                         ((struct rx_reorder_entry *)list_entry(pList->next,
 418                         struct rx_reorder_entry, list))->SeqNum))
 419                         return false;
 420                 else
 421                         break;
 422         }
 423         pReorderEntry->list.next = pList->next;
 424         pReorderEntry->list.next->prev = &pReorderEntry->list;
 425         pReorderEntry->list.prev = pList;
 426         pList->next = &pReorderEntry->list;
 427
 428         return true;
 429 }
 430
 431 void rtllib_indicate_packets(struct rtllib_device *ieee,
 432                              struct rtllib_rxb **prxbIndicateArray, u8 index)
 433 {
 434         struct net_device_stats *stats = &ieee->stats;
 435         u8 i = 0, j = 0;
 436         u16 ethertype;
 437
 438         for (j = 0; j < index; j++) {
 439                 struct rtllib_rxb *prxb = prxbIndicateArray[j];
 440
 441                 for (i = 0; i < prxb->nr_subframes; i++) {
 442                         struct sk_buff *sub_skb = prxb->subframes[i];
 443
 444                 /* convert hdr + possible LLC headers into Ethernet header */
 445                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
 446                         if (sub_skb->len >= 8 &&
 447                             ((memcmp(sub_skb->data, rfc1042_header,
 448                                      SNAP_SIZE) == 0 &&
 449                               ethertype != ETH_P_AARP &&
 450                               ethertype != ETH_P_IPX) ||
 451                             memcmp(sub_skb->data, bridge_tunnel_header,
 452                                    SNAP_SIZE) == 0)) {
 453                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
 454                                  * and replace EtherType
 455                                  */
 456                                 skb_pull(sub_skb, SNAP_SIZE);
 457                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 458                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 459                         } else {
 460                                 u16 len;
 461                         /* Leave Ethernet header part of hdr and full payload */
 462                                 len = sub_skb->len;
 463                                 memcpy(skb_push(sub_skb, 2), &len, 2);
 464                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 465                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 466                         }
 467
 468                         /* Indicate the packets to upper layer */
 469                         if (sub_skb) {
 470                                 stats->rx_packets++;
 471                                 stats->rx_bytes += sub_skb->len;
 472
 473                                 memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
 474                                 sub_skb->protocol = eth_type_trans(sub_skb,
 475                                                                    ieee->dev);
 476                                 sub_skb->dev = ieee->dev;
 477                                 sub_skb->dev->stats.rx_packets++;
 478                                 sub_skb->dev->stats.rx_bytes += sub_skb->len;
 479                                 /* 802.11 crc not sufficient */
 480                                 sub_skb->ip_summed = CHECKSUM_NONE;
 481                                 ieee->last_rx_ps_time = jiffies;
 482                                 netif_rx(sub_skb);
 483                         }
 484                 }
 485                 kfree(prxb);
 486                 prxb = NULL;
 487         }
 488 }
 489
 490 void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee,
 491                                  struct rx_ts_record *ts)
 492 {
 493         struct rx_reorder_entry *pRxReorderEntry;
 494         u8 RfdCnt = 0;
 495
 496         del_timer_sync(&ts->rx_pkt_pending_timer);
 497         while (!list_empty(&ts->rx_pending_pkt_list)) {
 498                 if (RfdCnt >= REORDER_WIN_SIZE) {
 499                         netdev_info(ieee->dev,
 500                                     "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n",
 501                                     __func__);
 502                         break;
 503                 }
 504
 505                 pRxReorderEntry = (struct rx_reorder_entry *)
 506                                   list_entry(ts->rx_pending_pkt_list.prev,
 507                                              struct rx_reorder_entry, list);
 508                 netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n", __func__,
 509                            pRxReorderEntry->SeqNum);
 510                 list_del_init(&pRxReorderEntry->list);
 511
 512                 ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
 513
 514                 RfdCnt = RfdCnt + 1;
 515                 list_add_tail(&pRxReorderEntry->list,
 516                               &ieee->RxReorder_Unused_List);
 517         }
 518         rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
 519
 520         ts->rx_indicate_seq = 0xffff;
 521 }
 522
 523 static void RxReorderIndicatePacket(struct rtllib_device *ieee,
 524                                     struct rtllib_rxb *prxb,
 525                                     struct rx_ts_record *ts, u16 SeqNum)
 526 {
 527         struct rt_hi_throughput *ht_info = ieee->ht_info;
 528         struct rx_reorder_entry *pReorderEntry = NULL;
 529         u8 WinSize = ht_info->rx_reorder_win_size;
 530         u16 WinEnd = 0;
 531         u8 index = 0;
 532         bool bMatchWinStart = false, bPktInBuf = false;
 533         unsigned long flags;
 534
 535         netdev_dbg(ieee->dev,
 536                    "%s(): Seq is %d, ts->rx_indicate_seq is %d, WinSize is %d\n",
 537                    __func__, SeqNum, ts->rx_indicate_seq, WinSize);
 538
 539         spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
 540
 541         WinEnd = (ts->rx_indicate_seq + WinSize - 1) % 4096;
 542         /* Rx Reorder initialize condition.*/
 543         if (ts->rx_indicate_seq == 0xffff)
 544                 ts->rx_indicate_seq = SeqNum;
 545
 546         /* Drop out the packet which SeqNum is smaller than WinStart */
 547         if (SN_LESS(SeqNum, ts->rx_indicate_seq)) {
 548                 netdev_dbg(ieee->dev,
 549                            "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
 550                            ts->rx_indicate_seq, SeqNum);
 551                 ht_info->rx_reorder_drop_counter++;
 552                 {
 553                         int i;
 554
 555                         for (i = 0; i < prxb->nr_subframes; i++)
 556                                 dev_kfree_skb(prxb->subframes[i]);
 557                         kfree(prxb);
 558                         prxb = NULL;
 559                 }
 560                 spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 561                 return;
 562         }
 563
 564         /* Sliding window manipulation. Conditions includes:
 565          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 566          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 567          */
 568         if (SN_EQUAL(SeqNum, ts->rx_indicate_seq)) {
 569                 ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) % 4096;
 570                 bMatchWinStart = true;
 571         } else if (SN_LESS(WinEnd, SeqNum)) {
 572                 if (SeqNum >= (WinSize - 1))
 573                         ts->rx_indicate_seq = SeqNum + 1 - WinSize;
 574                 else
 575                         ts->rx_indicate_seq = 4095 -
 576                                              (WinSize - (SeqNum + 1)) + 1;
 577                 netdev_dbg(ieee->dev,
 578                            "Window Shift! IndicateSeq: %d, NewSeq: %d\n",
 579                            ts->rx_indicate_seq, SeqNum);
 580         }
 581
 582         /* Indication process.
 583          * After Packet dropping and Sliding Window shifting as above, we can
 584          * now just indicate the packets with the SeqNum smaller than latest
 585          * WinStart and struct buffer other packets.
 586          *
 587          * For Rx Reorder condition:
 588          * 1. All packets with SeqNum smaller than WinStart => Indicate
 589          * 2. All packets with SeqNum larger than or equal to
 590          *       WinStart => Buffer it.
 591          */
 592         if (bMatchWinStart) {
 593                 /* Current packet is going to be indicated.*/
 594                 netdev_dbg(ieee->dev,
 595                            "Packets indication! IndicateSeq: %d, NewSeq: %d\n",
 596                            ts->rx_indicate_seq, SeqNum);
 597                 ieee->prxbIndicateArray[0] = prxb;
 598                 index = 1;
 599         } else {
 600                 /* Current packet is going to be inserted into pending list.*/
 601                 if (!list_empty(&ieee->RxReorder_Unused_List)) {
 602                         pReorderEntry = (struct rx_reorder_entry *)
 603                                         list_entry(ieee->RxReorder_Unused_List.next,
 604                                         struct rx_reorder_entry, list);
 605                         list_del_init(&pReorderEntry->list);
 606
 607                         /* Make a reorder entry and insert
 608                          * into a the packet list.
 609                          */
 610                         pReorderEntry->SeqNum = SeqNum;
 611                         pReorderEntry->prxb = prxb;
 612
 613                         if (!AddReorderEntry(ts, pReorderEntry)) {
 614                                 int i;
 615
 616                                 netdev_dbg(ieee->dev,
 617                                            "%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
 618                                            __func__, ts->rx_indicate_seq,
 619                                            SeqNum);
 620                                 list_add_tail(&pReorderEntry->list,
 621                                               &ieee->RxReorder_Unused_List);
 622
 623                                 for (i = 0; i < prxb->nr_subframes; i++)
 624                                         dev_kfree_skb(prxb->subframes[i]);
 625                                 kfree(prxb);
 626                                 prxb = NULL;
 627                         } else {
 628                                 netdev_dbg(ieee->dev,
 629                                            "Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
 630                                            ts->rx_indicate_seq, SeqNum);
 631                         }
 632                 } else {
 633                         /* Packets are dropped if there are not enough reorder
 634                          * entries. This part should be modified!! We can just
 635                          * indicate all the packets in struct buffer and get
 636                          * reorder entries.
 637                          */
 638                         netdev_err(ieee->dev,
 639                                    "%s(): There is no reorder entry! Packet is dropped!\n",
 640                                    __func__);
 641                         {
 642                                 int i;
 643
 644                                 for (i = 0; i < prxb->nr_subframes; i++)
 645                                         dev_kfree_skb(prxb->subframes[i]);
 646                                 kfree(prxb);
 647                                 prxb = NULL;
 648                         }
 649                 }
 650         }
 651
 652         /* Check if there is any packet need indicate.*/
 653         while (!list_empty(&ts->rx_pending_pkt_list)) {
 654                 netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
 655                            __func__);
 656
 657                 pReorderEntry = (struct rx_reorder_entry *)
 658                                         list_entry(ts->rx_pending_pkt_list.prev,
 659                                                    struct rx_reorder_entry,
 660                                                    list);
 661                 if (SN_LESS(pReorderEntry->SeqNum, ts->rx_indicate_seq) ||
 662                     SN_EQUAL(pReorderEntry->SeqNum, ts->rx_indicate_seq)) {
 663                         /* This protect struct buffer from overflow. */
 664                         if (index >= REORDER_WIN_SIZE) {
 665                                 netdev_err(ieee->dev,
 666                                            "%s(): Buffer overflow!\n",
 667                                            __func__);
 668                                 bPktInBuf = true;
 669                                 break;
 670                         }
 671
 672                         list_del_init(&pReorderEntry->list);
 673
 674                         if (SN_EQUAL(pReorderEntry->SeqNum, ts->rx_indicate_seq))
 675                                 ts->rx_indicate_seq = (ts->rx_indicate_seq + 1) %
 676                                                      4096;
 677
 678                         ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
 679                         netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n",
 680                                    __func__, pReorderEntry->SeqNum);
 681                         index++;
 682
 683                         list_add_tail(&pReorderEntry->list,
 684                                       &ieee->RxReorder_Unused_List);
 685                 } else {
 686                         bPktInBuf = true;
 687                         break;
 688                 }
 689         }
 690
 691         /* Handling pending timer. Set this timer to prevent from long time
 692          * Rx buffering.
 693          */
 694         if (index > 0) {
 695                 spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
 696                 if (timer_pending(&ts->rx_pkt_pending_timer))
 697                         del_timer_sync(&ts->rx_pkt_pending_timer);
 698                 spin_lock_irqsave(&ieee->reorder_spinlock, flags);
 699                 ts->rx_timeout_indicate_seq = 0xffff;
 700
 701                 if (index > REORDER_WIN_SIZE) {
 702                         netdev_err(ieee->dev,
 703                                    "%s(): Rx Reorder struct buffer full!\n",
 704                                    __func__);
 705                         spin_unlock_irqrestore(&(ieee->reorder_spinlock),
 706                                                flags);
 707                         return;
 708                 }
 709                 rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
 710                 bPktInBuf = false;
 711         }
 712
 713         if (bPktInBuf && ts->rx_timeout_indicate_seq == 0xffff) {
 714                 netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
 715                 ts->rx_timeout_indicate_seq = ts->rx_indicate_seq;
 716                 spin_unlock_irqrestore(&ieee->reorder_spinlock, flags);
 717                 mod_timer(&ts->rx_pkt_pending_timer, jiffies +
 718                           msecs_to_jiffies(ht_info->rx_reorder_pending_time));
 719                 spin_lock_irqsave(&ieee->reorder_spinlock, flags);
 720         }
 721         spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 722 }
 723
 724 static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
 725                          struct rtllib_rx_stats *rx_stats,
 726                          struct rtllib_rxb *rxb, u8 *src, u8 *dst)
 727 {
 728         struct ieee80211_hdr_3addr  *hdr = (struct ieee80211_hdr_3addr *)skb->data;
 729         u16             fc = le16_to_cpu(hdr->frame_control);
 730
 731         u16             LLCOffset = sizeof(struct ieee80211_hdr_3addr);
 732         u16             ChkLength;
 733         bool            is_aggregate_frame = false;
 734         u16             nSubframe_Length;
 735         u8              nPadding_Length = 0;
 736         u16             SeqNum = 0;
 737         struct sk_buff *sub_skb;
 738         /* just for debug purpose */
 739         SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctrl));
 740         if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
 741            (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
 742                 is_aggregate_frame = true;
 743
 744         if (RTLLIB_QOS_HAS_SEQ(fc))
 745                 LLCOffset += 2;
 746         if (rx_stats->bContainHTC)
 747                 LLCOffset += sHTCLng;
 748
 749         ChkLength = LLCOffset;
 750
 751         if (skb->len <= ChkLength)
 752                 return 0;
 753
 754         skb_pull(skb, LLCOffset);
 755         ieee->is_aggregate_frame = is_aggregate_frame;
 756         if (!is_aggregate_frame) {
 757                 rxb->nr_subframes = 1;
 758
 759                 /* altered by clark 3/30/2010
 760                  * The struct buffer size of the skb indicated to upper layer
 761                  * must be less than 5000, or the defraged IP datagram
 762                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 763                  * discarded. so there must not use the function
 764                  * "skb_copy" and "skb_clone" for "skb".
 765                  */
 766
 767                 /* Allocate new skb for releasing to upper layer */
 768                 sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
 769                 if (!sub_skb)
 770                         return 0;
 771                 skb_reserve(sub_skb, 12);
 772                 skb_put_data(sub_skb, skb->data, skb->len);
 773                 sub_skb->dev = ieee->dev;
 774
 775                 rxb->subframes[0] = sub_skb;
 776
 777                 memcpy(rxb->src, src, ETH_ALEN);
 778                 memcpy(rxb->dst, dst, ETH_ALEN);
 779                 rxb->subframes[0]->dev = ieee->dev;
 780                 return 1;
 781         }
 782
 783         rxb->nr_subframes = 0;
 784         memcpy(rxb->src, src, ETH_ALEN);
 785         memcpy(rxb->dst, dst, ETH_ALEN);
 786         while (skb->len > ETHERNET_HEADER_SIZE) {
 787                 /* Offset 12 denote 2 mac address */
 788                 nSubframe_Length = *((u16 *)(skb->data + 12));
 789                 nSubframe_Length = (nSubframe_Length >> 8) +
 790                                    (nSubframe_Length << 8);
 791
 792                 if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 793                         netdev_info(ieee->dev,
 794                                     "%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
 795                                     __func__, rxb->nr_subframes);
 796                         netdev_info(ieee->dev,
 797                                     "%s: A-MSDU parse error!! Subframe Length: %d\n",
 798                                     __func__, nSubframe_Length);
 799                         netdev_info(ieee->dev,
 800                                     "nRemain_Length is %d and nSubframe_Length is : %d\n",
 801                                     skb->len, nSubframe_Length);
 802                         netdev_info(ieee->dev,
 803                                     "The Packet SeqNum is %d\n",
 804                                     SeqNum);
 805                         return 0;
 806                 }
 807
 808                 /* move the data point to data content */
 809                 skb_pull(skb, ETHERNET_HEADER_SIZE);
 810
 811                 /* altered by clark 3/30/2010
 812                  * The struct buffer size of the skb indicated to upper layer
 813                  * must be less than 5000, or the defraged IP datagram
 814                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 815                  * discarded. so there must not use the function
 816                  * "skb_copy" and "skb_clone" for "skb".
 817                  */
 818
 819                 /* Allocate new skb for releasing to upper layer */
 820                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 821                 if (!sub_skb)
 822                         return 0;
 823                 skb_reserve(sub_skb, 12);
 824                 skb_put_data(sub_skb, skb->data, nSubframe_Length);
 825
 826                 sub_skb->dev = ieee->dev;
 827                 rxb->subframes[rxb->nr_subframes++] = sub_skb;
 828                 if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
 829                         netdev_dbg(ieee->dev,
 830                                    "ParseSubframe(): Too many Subframes! Packets dropped!\n");
 831                         break;
 832                 }
 833                 skb_pull(skb, nSubframe_Length);
 834
 835                 if (skb->len != 0) {
 836                         nPadding_Length = 4 - ((nSubframe_Length +
 837                                           ETHERNET_HEADER_SIZE) % 4);
 838                         if (nPadding_Length == 4)
 839                                 nPadding_Length = 0;
 840
 841                         if (skb->len < nPadding_Length)
 842                                 return 0;
 843
 844                         skb_pull(skb, nPadding_Length);
 845                 }
 846         }
 847
 848         return rxb->nr_subframes;
 849 }
 850
 851 static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
 852                                    struct sk_buff *skb,
 853                                    struct rtllib_rx_stats *rx_stats)
 854 {
 855         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 856         u16 fc = le16_to_cpu(hdr->frame_control);
 857         size_t hdrlen;
 858
 859         hdrlen = rtllib_get_hdrlen(fc);
 860         if (ht_c_check(ieee, skb->data)) {
 861                 if (net_ratelimit())
 862                         netdev_info(ieee->dev, "%s: find HTCControl!\n",
 863                                     __func__);
 864                 hdrlen += 4;
 865                 rx_stats->bContainHTC = true;
 866         }
 867
 868         if (RTLLIB_QOS_HAS_SEQ(fc))
 869                 rx_stats->bIsQosData = true;
 870
 871         return hdrlen;
 872 }
 873
 874 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
 875                                      struct sk_buff *skb, u8 multicast)
 876 {
 877         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 878         u16 fc, sc;
 879         u8 frag;
 880
 881         fc = le16_to_cpu(hdr->frame_control);
 882         sc = le16_to_cpu(hdr->seq_ctrl);
 883         frag = WLAN_GET_SEQ_FRAG(sc);
 884
 885         if (!ieee->ht_info->cur_rx_reorder_enable ||
 886                 !ieee->current_network.qos_data.active ||
 887                 !IsDataFrame(skb->data) ||
 888                 IsLegacyDataFrame(skb->data)) {
 889                 if (!ieee80211_is_beacon(hdr->frame_control)) {
 890                         if (is_duplicate_packet(ieee, hdr))
 891                                 return -1;
 892                 }
 893         } else {
 894                 struct rx_ts_record *ts = NULL;
 895
 896                 if (rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2,
 897                         (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
 898                         if ((fc & (1 << 11)) && (frag == ts->rx_last_frag_num) &&
 899                             (WLAN_GET_SEQ_SEQ(sc) == ts->rx_last_seq_num))
 900                                 return -1;
 901                         ts->rx_last_frag_num = frag;
 902                         ts->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
 903                 } else {
 904                         netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
 905                                     __func__);
 906                         return -1;
 907                 }
 908         }
 909
 910         return 0;
 911 }
 912
 913 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
 914                                    struct ieee80211_hdr *hdr, u8 *dst,
 915                                    u8 *src, u8 *bssid)
 916 {
 917         u16 fc = le16_to_cpu(hdr->frame_control);
 918
 919         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 920         case IEEE80211_FCTL_FROMDS:
 921                 ether_addr_copy(dst, hdr->addr1);
 922                 ether_addr_copy(src, hdr->addr3);
 923                 ether_addr_copy(bssid, hdr->addr2);
 924                 break;
 925         case IEEE80211_FCTL_TODS:
 926                 ether_addr_copy(dst, hdr->addr3);
 927                 ether_addr_copy(src, hdr->addr2);
 928                 ether_addr_copy(bssid, hdr->addr1);
 929                 break;
 930         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 931                 ether_addr_copy(dst, hdr->addr3);
 932                 ether_addr_copy(src, hdr->addr4);
 933                 ether_addr_copy(bssid, ieee->current_network.bssid);
 934                 break;
 935         default:
 936                 ether_addr_copy(dst, hdr->addr1);
 937                 ether_addr_copy(src, hdr->addr2);
 938                 ether_addr_copy(bssid, hdr->addr3);
 939                 break;
 940         }
 941 }
 942
 943 static int rtllib_rx_data_filter(struct rtllib_device *ieee, struct ieee80211_hdr *hdr,
 944                                  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
 945 {
 946         u8 type, stype;
 947         u16 fc = le16_to_cpu(hdr->frame_control);
 948         type = WLAN_FC_GET_TYPE(fc);
 949         stype = WLAN_FC_GET_STYPE(fc);
 950
 951         /* Filter frames from different BSS */
 952         if (ieee80211_has_a4(hdr->frame_control) &&
 953             !ether_addr_equal(ieee->current_network.bssid, bssid) &&
 954             !is_zero_ether_addr(ieee->current_network.bssid)) {
 955                 return -1;
 956         }
 957
 958         /* Nullfunc frames may have PS-bit set, so they must be passed to
 959          * hostap_handle_sta_rx() before being dropped here.
 960          */
 961         if (stype != IEEE80211_STYPE_DATA &&
 962             stype != IEEE80211_STYPE_DATA_CFACK &&
 963             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 964             stype != IEEE80211_STYPE_DATA_CFACKPOLL &&
 965             stype != IEEE80211_STYPE_QOS_DATA) {
 966                 if (stype != IEEE80211_STYPE_NULLFUNC)
 967                         netdev_dbg(ieee->dev,
 968                                    "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
 969                                    type, stype);
 970                 return -1;
 971         }
 972
 973         /* packets from our adapter are dropped (echo) */
 974         if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
 975                 return -1;
 976
 977         /* {broad,multi}cast packets to our BSS go through */
 978         if (is_multicast_ether_addr(dst)) {
 979                 if (memcmp(bssid, ieee->current_network.bssid,
 980                            ETH_ALEN))
 981                         return -1;
 982         }
 983         return 0;
 984 }
 985
 986 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
 987                         struct lib80211_crypt_data **crypt, size_t hdrlen)
 988 {
 989         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 990         u16 fc = le16_to_cpu(hdr->frame_control);
 991         int idx = 0;
 992
 993         if (skb->len >= hdrlen + 3)
 994                 idx = skb->data[hdrlen + 3] >> 6;
 995
 996         *crypt = ieee->crypt_info.crypt[idx];
 997         /* allow NULL decrypt to indicate an station specific override
 998          * for default encryption
 999          */
1000         if (*crypt && (!(*crypt)->ops || !(*crypt)->ops->decrypt_mpdu))
1001                 *crypt = NULL;
1002
1003         if (!*crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
1004                 /* This seems to be triggered by some (multicast?)
1005                  * frames from other than current BSS, so just drop the
1006                  * frames silently instead of filling system log with
1007                  * these reports.
1008                  */
1009                 netdev_dbg(ieee->dev,
1010                            "Decryption failed (not set) (SA= %pM)\n",
1011                            hdr->addr2);
1012                 return -1;
1013         }
1014
1015         return 0;
1016 }
1017
1018 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1019                       struct rtllib_rx_stats *rx_stats,
1020                       struct lib80211_crypt_data *crypt, size_t hdrlen)
1021 {
1022         struct ieee80211_hdr *hdr;
1023         int keyidx = 0;
1024         u16 fc, sc;
1025         u8 frag;
1026
1027         hdr = (struct ieee80211_hdr *)skb->data;
1028         fc = le16_to_cpu(hdr->frame_control);
1029         sc = le16_to_cpu(hdr->seq_ctrl);
1030         frag = WLAN_GET_SEQ_FRAG(sc);
1031
1032         if ((!rx_stats->Decrypted))
1033                 ieee->need_sw_enc = 1;
1034         else
1035                 ieee->need_sw_enc = 0;
1036
1037         keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1038         if ((fc & IEEE80211_FCTL_PROTECTED) && (keyidx < 0)) {
1039                 netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
1040                 return -1;
1041         }
1042
1043         hdr = (struct ieee80211_hdr *)skb->data;
1044         if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
1045                 int flen;
1046                 struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1047
1048                 netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
1049
1050                 if (!frag_skb) {
1051                         netdev_dbg(ieee->dev,
1052                                    "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
1053                                    (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
1054                                    WLAN_GET_SEQ_SEQ(sc), frag);
1055                         return -1;
1056                 }
1057                 flen = skb->len;
1058                 if (frag != 0)
1059                         flen -= hdrlen;
1060
1061                 if (frag_skb->tail + flen > frag_skb->end) {
1062                         netdev_warn(ieee->dev,
1063                                     "%s: host decrypted and reassembled frame did not fit skb\n",
1064                                     __func__);
1065                         rtllib_frag_cache_invalidate(ieee, hdr);
1066                         return -1;
1067                 }
1068
1069                 if (frag == 0) {
1070                         /* copy first fragment (including full headers) into
1071                          * beginning of the fragment cache skb
1072                          */
1073                         skb_put_data(frag_skb, skb->data, flen);
1074                 } else {
1075                         /* append frame payload to the end of the fragment
1076                          * cache skb
1077                          */
1078                         skb_put_data(frag_skb, skb->data + hdrlen, flen);
1079                 }
1080                 dev_kfree_skb_any(skb);
1081                 skb = NULL;
1082
1083                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
1084                         /* more fragments expected - leave the skb in fragment
1085                          * cache for now; it will be delivered to upper layers
1086                          * after all fragments have been received
1087                          */
1088                         return -2;
1089                 }
1090
1091                 /* this was the last fragment and the frame will be
1092                  * delivered, so remove skb from fragment cache
1093                  */
1094                 skb = frag_skb;
1095                 hdr = (struct ieee80211_hdr *)skb->data;
1096                 rtllib_frag_cache_invalidate(ieee, hdr);
1097         }
1098
1099         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1100          * encrypted/authenticated
1101          */
1102         if ((fc & IEEE80211_FCTL_PROTECTED) &&
1103                 rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1104                 netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
1105                 return -1;
1106         }
1107
1108         hdr = (struct ieee80211_hdr *)skb->data;
1109         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
1110                 if (/*ieee->ieee802_1x &&*/
1111                     rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1112                         /* pass unencrypted EAPOL frames even if encryption is
1113                          * configured
1114                          */
1115                         struct eapol *eap = (struct eapol *)(skb->data +
1116                                 24);
1117                         netdev_dbg(ieee->dev,
1118                                    "RX: IEEE 802.1X EAPOL frame: %s\n",
1119                                    eap_get_type(eap->type));
1120                 } else {
1121                         netdev_dbg(ieee->dev,
1122                                    "encryption configured, but RX frame not encrypted (SA= %pM)\n",
1123                                    hdr->addr2);
1124                         return -1;
1125                 }
1126         }
1127
1128         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) &&
1129             rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1130                 struct eapol *eap = (struct eapol *)(skb->data + 24);
1131
1132                 netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
1133                            eap_get_type(eap->type));
1134         }
1135
1136         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
1137             !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1138                 netdev_dbg(ieee->dev,
1139                            "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
1140                            hdr->addr2);
1141                 return -1;
1142         }
1143
1144         return 0;
1145 }
1146
1147 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
1148                                       u8 nr_subframes)
1149 {
1150         if (unicast) {
1151                 if (ieee->link_state == MAC80211_LINKED) {
1152                         if (((ieee->link_detect_info.NumRxUnicastOkInPeriod +
1153                             ieee->link_detect_info.num_tx_ok_in_period) > 8) ||
1154                             (ieee->link_detect_info.NumRxUnicastOkInPeriod > 2)) {
1155                                 ieee->leisure_ps_leave(ieee->dev);
1156                         }
1157                 }
1158         }
1159         ieee->last_rx_ps_time = jiffies;
1160 }
1161
1162 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1163                 struct rtllib_rx_stats *rx_stats,
1164                 struct rtllib_rxb *rxb,
1165                 u8 *dst,
1166                 u8 *src)
1167 {
1168         struct net_device *dev = ieee->dev;
1169         u16 ethertype;
1170         int i = 0;
1171
1172         if (!rxb) {
1173                 netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
1174                 return;
1175         }
1176
1177         for (i = 0; i < rxb->nr_subframes; i++) {
1178                 struct sk_buff *sub_skb = rxb->subframes[i];
1179
1180                 if (sub_skb) {
1181                         /* convert hdr + possible LLC headers
1182                          * into Ethernet header
1183                          */
1184                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1185                         if (sub_skb->len >= 8 &&
1186                                 ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1187                                 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1188                                 memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1189                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
1190                                  * and replace EtherType
1191                                  */
1192                                 skb_pull(sub_skb, SNAP_SIZE);
1193                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1194                                                 src);
1195                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1196                                                 dst);
1197                         } else {
1198                                 u16 len;
1199                                 /* Leave Ethernet header part of hdr
1200                                  * and full payload
1201                                  */
1202                                 len = sub_skb->len;
1203                                 memcpy(skb_push(sub_skb, 2), &len, 2);
1204                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1205                                                 src);
1206                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1207                                                 dst);
1208                         }
1209
1210                         ieee->stats.rx_packets++;
1211                         ieee->stats.rx_bytes += sub_skb->len;
1212
1213                         if (is_multicast_ether_addr(dst))
1214                                 ieee->stats.multicast++;
1215
1216                         /* Indicate the packets to upper layer */
1217                         memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1218                         sub_skb->protocol = eth_type_trans(sub_skb, dev);
1219                         sub_skb->dev = dev;
1220                         sub_skb->dev->stats.rx_packets++;
1221                         sub_skb->dev->stats.rx_bytes += sub_skb->len;
1222                         /* 802.11 crc not sufficient */
1223                         sub_skb->ip_summed = CHECKSUM_NONE;
1224                         netif_rx(sub_skb);
1225                 }
1226         }
1227         kfree(rxb);
1228 }
1229
1230 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1231                  struct rtllib_rx_stats *rx_stats)
1232 {
1233         struct net_device *dev = ieee->dev;
1234         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1235         struct lib80211_crypt_data *crypt = NULL;
1236         struct rtllib_rxb *rxb = NULL;
1237         struct rx_ts_record *ts = NULL;
1238         u16 fc, sc, SeqNum = 0;
1239         u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1240         u8 dst[ETH_ALEN];
1241         u8 src[ETH_ALEN];
1242         u8 bssid[ETH_ALEN] = {0};
1243
1244         size_t hdrlen = 0;
1245         int ret = 0, i = 0;
1246
1247         fc = le16_to_cpu(hdr->frame_control);
1248         type = WLAN_FC_GET_TYPE(fc);
1249         stype = WLAN_FC_GET_STYPE(fc);
1250         sc = le16_to_cpu(hdr->seq_ctrl);
1251
1252         /*Filter pkt not to me*/
1253         multicast = is_multicast_ether_addr(hdr->addr1);
1254         unicast = !multicast;
1255         if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1))
1256                 goto rx_dropped;
1257
1258         /*Filter pkt has too small length */
1259         hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1260         if (skb->len < hdrlen) {
1261                 netdev_info(dev,
1262                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1263                             __func__);
1264                 goto rx_dropped;
1265         }
1266
1267         /* Filter Duplicate pkt */
1268         ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1269         if (ret < 0)
1270                 goto rx_dropped;
1271
1272         /* Filter CTRL Frame */
1273         if (type == RTLLIB_FTYPE_CTL)
1274                 goto rx_dropped;
1275
1276         /* Filter MGNT Frame */
1277         if (type == RTLLIB_FTYPE_MGMT) {
1278                 if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1279                         goto rx_dropped;
1280                 else
1281                         goto rx_exit;
1282         }
1283
1284         /* Filter WAPI DATA Frame */
1285
1286         /* Update statstics for AP roaming */
1287         ieee->link_detect_info.NumRecvDataInPeriod++;
1288         ieee->link_detect_info.num_rx_ok_in_period++;
1289
1290         /* Data frame - extract src/dst addresses */
1291         rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1292
1293         /* Filter Data frames */
1294         ret = rtllib_rx_data_filter(ieee, hdr, dst, src, bssid, hdr->addr2);
1295         if (ret < 0)
1296                 goto rx_dropped;
1297
1298         if (skb->len == hdrlen)
1299                 goto rx_dropped;
1300
1301         /* Send pspoll based on moredata */
1302         if ((ieee->iw_mode == IW_MODE_INFRA)  &&
1303             (ieee->sta_sleep == LPS_IS_SLEEP) &&
1304             (ieee->polling)) {
1305                 if (WLAN_FC_MORE_DATA(fc)) {
1306                         /* more data bit is set, let's request a new frame
1307                          * from the AP
1308                          */
1309                         rtllib_sta_ps_send_pspoll_frame(ieee);
1310                 } else {
1311                         ieee->polling =  false;
1312                 }
1313         }
1314
1315         /* Get crypt if encrypted */
1316         ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1317         if (ret == -1)
1318                 goto rx_dropped;
1319
1320         /* Decrypt data frame (including reassemble) */
1321         ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1322         if (ret == -1)
1323                 goto rx_dropped;
1324         else if (ret == -2)
1325                 goto rx_exit;
1326
1327         /* Get TS for Rx Reorder  */
1328         hdr = (struct ieee80211_hdr *)skb->data;
1329         if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1330                 && !is_multicast_ether_addr(hdr->addr1)) {
1331                 TID = Frame_QoSTID(skb->data);
1332                 SeqNum = WLAN_GET_SEQ_SEQ(sc);
1333                 rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2, TID,
1334                       RX_DIR, true);
1335                 if (TID != 0 && TID != 3)
1336                         ieee->bis_any_nonbepkts = true;
1337         }
1338
1339         /* Parse rx data frame (For AMSDU) */
1340         /* skb: hdr + (possible reassembled) full plaintext payload */
1341         rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1342         if (!rxb)
1343                 goto rx_dropped;
1344
1345         /* to parse amsdu packets */
1346         /* qos data packets & reserved bit is 1 */
1347         if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1348                 /* only to free rxb, and not submit the packets
1349                  * to upper layer
1350                  */
1351                 for (i = 0; i < rxb->nr_subframes; i++)
1352                         dev_kfree_skb(rxb->subframes[i]);
1353                 kfree(rxb);
1354                 rxb = NULL;
1355                 goto rx_dropped;
1356         }
1357
1358         /* Update WAPI PN */
1359
1360         /* Check if leave LPS */
1361         if (ieee->is_aggregate_frame)
1362                 nr_subframes = rxb->nr_subframes;
1363         else
1364                 nr_subframes = 1;
1365         if (unicast)
1366                 ieee->link_detect_info.NumRxUnicastOkInPeriod += nr_subframes;
1367         rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1368
1369         /* Indicate packets to upper layer or Rx Reorder */
1370         if (!ieee->ht_info->cur_rx_reorder_enable || !ts)
1371                 rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1372         else
1373                 RxReorderIndicatePacket(ieee, rxb, ts, SeqNum);
1374
1375         dev_kfree_skb(skb);
1376
1377  rx_exit:
1378         return 1;
1379
1380  rx_dropped:
1381         ieee->stats.rx_dropped++;
1382
1383         /* Returning 0 indicates to caller that we have not handled the SKB--
1384          * so it is still allocated and can be used again by underlying
1385          * hardware as a DMA target
1386          */
1387         return 0;
1388 }
1389
1390 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1391                  struct rtllib_rx_stats *rx_stats)
1392 {
1393         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1394         u16 fc = le16_to_cpu(hdr->frame_control);
1395         size_t hdrlen = rtllib_get_hdrlen(fc);
1396
1397         if (skb->len < hdrlen) {
1398                 netdev_info(ieee->dev,
1399                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1400                             __func__);
1401                 return 0;
1402         }
1403
1404         if (ht_c_check(ieee, skb->data)) {
1405                 if (net_ratelimit())
1406                         netdev_info(ieee->dev, "%s: Find HTCControl!\n",
1407                                     __func__);
1408                 hdrlen += 4;
1409         }
1410
1411         ieee->stats.rx_packets++;
1412         ieee->stats.rx_bytes += skb->len;
1413         rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1414
1415         return 1;
1416 }
1417
1418 /* All received frames are sent to this function. @skb contains the frame in
1419  * IEEE 802.11 format, i.e., in the format it was sent over air.
1420  * This function is called only as a tasklet (software IRQ).
1421  */
1422 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1423                  struct rtllib_rx_stats *rx_stats)
1424 {
1425         int ret = 0;
1426
1427         if (!ieee || !skb || !rx_stats) {
1428                 pr_info("%s: Input parameters NULL!\n", __func__);
1429                 goto rx_dropped;
1430         }
1431         if (skb->len < 10) {
1432                 netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
1433                 goto rx_dropped;
1434         }
1435
1436         switch (ieee->iw_mode) {
1437         case IW_MODE_INFRA:
1438                 ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1439                 break;
1440         case IW_MODE_MONITOR:
1441                 ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1442                 break;
1443         default:
1444                 netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
1445                 break;
1446         }
1447
1448         return ret;
1449
1450  rx_dropped:
1451         if (ieee)
1452                 ieee->stats.rx_dropped++;
1453         return 0;
1454 }
1455 EXPORT_SYMBOL(rtllib_rx);
1456
1457 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1458
1459 /* Make ther structure we read from the beacon packet has the right values */
1460 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1461                                      *info_element, int sub_type)
1462 {
1463         if (info_element->elementID != QOS_ELEMENT_ID)
1464                 return -1;
1465         if (info_element->qui_subtype != sub_type)
1466                 return -1;
1467         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1468                 return -1;
1469         if (info_element->qui_type != QOS_OUI_TYPE)
1470                 return -1;
1471         if (info_element->version != QOS_VERSION_1)
1472                 return -1;
1473
1474         return 0;
1475 }
1476
1477 /* Parse a QoS parameter element */
1478 static int rtllib_read_qos_param_element(
1479                         struct rtllib_qos_parameter_info *element_param,
1480                         struct rtllib_info_element *info_element)
1481 {
1482         size_t size = sizeof(*element_param);
1483
1484         if (!element_param || !info_element || info_element->len != size - 2)
1485                 return -1;
1486
1487         memcpy(element_param, info_element, size);
1488         return rtllib_verify_qos_info(&element_param->info_element,
1489                                       QOS_OUI_PARAM_SUB_TYPE);
1490 }
1491
1492 /* Parse a QoS information element */
1493 static int rtllib_read_qos_info_element(
1494                         struct rtllib_qos_information_element *element_info,
1495                         struct rtllib_info_element *info_element)
1496 {
1497         size_t size = sizeof(*element_info);
1498
1499         if (!element_info || !info_element || info_element->len != size - 2)
1500                 return -1;
1501
1502         memcpy(element_info, info_element, size);
1503         return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
1504 }
1505
1506 /* Write QoS parameters from the ac parameters. */
1507 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1508                                                struct rtllib_qos_data *qos_data)
1509 {
1510         struct rtllib_qos_ac_parameter *ac_params;
1511         struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1512         int i;
1513         u8 aci;
1514         u8 acm;
1515
1516         qos_data->wmm_acm = 0;
1517         for (i = 0; i < QOS_QUEUE_NUM; i++) {
1518                 ac_params = &(param_elm->ac_params_record[i]);
1519
1520                 aci = (ac_params->aci_aifsn & 0x60) >> 5;
1521                 acm = (ac_params->aci_aifsn & 0x10) >> 4;
1522
1523                 if (aci >= QOS_QUEUE_NUM)
1524                         continue;
1525                 switch (aci) {
1526                 case 1:
1527                         /* BIT(0) | BIT(3) */
1528                         if (acm)
1529                                 qos_data->wmm_acm |= (0x01 << 0) | (0x01 << 3);
1530                         break;
1531                 case 2:
1532                         /* BIT(4) | BIT(5) */
1533                         if (acm)
1534                                 qos_data->wmm_acm |= (0x01 << 4) | (0x01 << 5);
1535                         break;
1536                 case 3:
1537                         /* BIT(6) | BIT(7) */
1538                         if (acm)
1539                                 qos_data->wmm_acm |= (0x01 << 6) | (0x01 << 7);
1540                         break;
1541                 case 0:
1542                 default:
1543                         /* BIT(1) | BIT(2) */
1544                         if (acm)
1545                                 qos_data->wmm_acm |= (0x01 << 1) | (0x01 << 2);
1546                         break;
1547                 }
1548
1549                 qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1550
1551                 /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1552                 qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
1553
1554                 qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
1555                                                      0x0F);
1556
1557                 qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
1558                                                       0xF0) >> 4);
1559
1560                 qos_param->flag[aci] =
1561                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1562                 qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
1563         }
1564         return 0;
1565 }
1566
1567 /* we have a generic data element which it may contain QoS information or
1568  * parameters element. check the information element length to decide
1569  * which type to read
1570  */
1571 static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
1572                                           struct rtllib_info_element
1573                                              *info_element,
1574                                           struct rtllib_network *network)
1575 {
1576         int rc = 0;
1577         struct rtllib_qos_information_element qos_info_element;
1578
1579         rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1580
1581         if (rc == 0) {
1582                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1583                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1584         } else {
1585                 struct rtllib_qos_parameter_info param_element;
1586
1587                 rc = rtllib_read_qos_param_element(&param_element,
1588                                                       info_element);
1589                 if (rc == 0) {
1590                         rtllib_qos_convert_ac_to_parameters(&param_element,
1591                                                                &(network->qos_data));
1592                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1593                         network->qos_data.param_count =
1594                             param_element.info_element.ac_info & 0x0F;
1595                 }
1596         }
1597
1598         if (rc == 0) {
1599                 netdev_dbg(ieee->dev, "QoS is supported\n");
1600                 network->qos_data.supported = 1;
1601         }
1602         return rc;
1603 }
1604
1605 static const char *get_info_element_string(u16 id)
1606 {
1607         switch (id) {
1608         case MFIE_TYPE_SSID:
1609                 return "SSID";
1610         case MFIE_TYPE_RATES:
1611                 return "RATES";
1612         case MFIE_TYPE_FH_SET:
1613                 return "FH_SET";
1614         case MFIE_TYPE_DS_SET:
1615                 return "DS_SET";
1616         case MFIE_TYPE_CF_SET:
1617                 return "CF_SET";
1618         case MFIE_TYPE_TIM:
1619                 return "TIM";
1620         case MFIE_TYPE_IBSS_SET:
1621                 return "IBSS_SET";
1622         case MFIE_TYPE_COUNTRY:
1623                 return "COUNTRY";
1624         case MFIE_TYPE_HOP_PARAMS:
1625                 return "HOP_PARAMS";
1626         case MFIE_TYPE_HOP_TABLE:
1627                 return "HOP_TABLE";
1628         case MFIE_TYPE_REQUEST:
1629                 return "REQUEST";
1630         case MFIE_TYPE_CHALLENGE:
1631                 return "CHALLENGE";
1632         case MFIE_TYPE_POWER_CONSTRAINT:
1633                 return "POWER_CONSTRAINT";
1634         case MFIE_TYPE_POWER_CAPABILITY:
1635                 return "POWER_CAPABILITY";
1636         case MFIE_TYPE_TPC_REQUEST:
1637                 return "TPC_REQUEST";
1638         case MFIE_TYPE_TPC_REPORT:
1639                 return "TPC_REPORT";
1640         case MFIE_TYPE_SUPP_CHANNELS:
1641                 return "SUPP_CHANNELS";
1642         case MFIE_TYPE_CSA:
1643                 return "CSA";
1644         case MFIE_TYPE_MEASURE_REQUEST:
1645                 return "MEASURE_REQUEST";
1646         case MFIE_TYPE_MEASURE_REPORT:
1647                 return "MEASURE_REPORT";
1648         case MFIE_TYPE_QUIET:
1649                 return "QUIET";
1650         case MFIE_TYPE_IBSS_DFS:
1651                 return "IBSS_DFS";
1652         case MFIE_TYPE_RSN:
1653                 return "RSN";
1654         case MFIE_TYPE_RATES_EX:
1655                 return "RATES_EX";
1656         case MFIE_TYPE_GENERIC:
1657                 return "GENERIC";
1658         case MFIE_TYPE_QOS_PARAMETER:
1659                 return "QOS_PARAMETER";
1660         default:
1661                 return "UNKNOWN";
1662         }
1663 }
1664
1665 static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
1666                                       struct rtllib_info_element *info_element,
1667                                       struct rtllib_network *network,
1668                                       u16 *tmp_htcap_len,
1669                                       u16 *tmp_htinfo_len)
1670 {
1671         u16 ht_realtek_agg_len = 0;
1672         u8  ht_realtek_agg_buf[MAX_IE_LEN];
1673
1674         if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
1675                 return;
1676         if (info_element->len >= 4 &&
1677             info_element->data[0] == 0x00 &&
1678             info_element->data[1] == 0x50 &&
1679             info_element->data[2] == 0xf2 &&
1680             info_element->data[3] == 0x01) {
1681                 network->wpa_ie_len = min(info_element->len + 2,
1682                                           MAX_WPA_IE_LEN);
1683                 memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
1684                 return;
1685         }
1686         if (info_element->len == 7 &&
1687             info_element->data[0] == 0x00 &&
1688             info_element->data[1] == 0xe0 &&
1689             info_element->data[2] == 0x4c &&
1690             info_element->data[3] == 0x01 &&
1691             info_element->data[4] == 0x02)
1692                 network->Turbo_Enable = 1;
1693
1694         if (*tmp_htcap_len == 0) {
1695                 if (info_element->len >= 4 &&
1696                     info_element->data[0] == 0x00 &&
1697                     info_element->data[1] == 0x90 &&
1698                     info_element->data[2] == 0x4c &&
1699                     info_element->data[3] == 0x033) {
1700                         *tmp_htcap_len = min_t(u8, info_element->len,
1701                                                MAX_IE_LEN);
1702                         if (*tmp_htcap_len != 0) {
1703                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1704                                 network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1705                                                                   sizeof(network->bssht.bd_ht_cap_buf));
1706                                 memcpy(network->bssht.bd_ht_cap_buf,
1707                                        info_element->data,
1708                                        network->bssht.bd_ht_cap_len);
1709                         }
1710                 }
1711                 if (*tmp_htcap_len != 0) {
1712                         network->bssht.bd_support_ht = true;
1713                         network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
1714                 } else {
1715                         network->bssht.bd_support_ht = false;
1716                         network->bssht.bd_ht_1r = false;
1717                 }
1718         }
1719
1720         if (*tmp_htinfo_len == 0) {
1721                 if (info_element->len >= 4 &&
1722                     info_element->data[0] == 0x00 &&
1723                     info_element->data[1] == 0x90 &&
1724                     info_element->data[2] == 0x4c &&
1725                     info_element->data[3] == 0x034) {
1726                         *tmp_htinfo_len = min_t(u8, info_element->len,
1727                                                 MAX_IE_LEN);
1728                         if (*tmp_htinfo_len != 0) {
1729                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1730                                 network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
1731                                                                       sizeof(network->bssht.bd_ht_info_buf));
1732                                 memcpy(network->bssht.bd_ht_info_buf,
1733                                        info_element->data,
1734                                        network->bssht.bd_ht_info_len);
1735                         }
1736                 }
1737         }
1738
1739         if (network->bssht.bd_support_ht) {
1740                 if (info_element->len >= 4 &&
1741                     info_element->data[0] == 0x00 &&
1742                     info_element->data[1] == 0xe0 &&
1743                     info_element->data[2] == 0x4c &&
1744                     info_element->data[3] == 0x02) {
1745                         ht_realtek_agg_len = min_t(u8, info_element->len,
1746                                                    MAX_IE_LEN);
1747                         memcpy(ht_realtek_agg_buf, info_element->data,
1748                                info_element->len);
1749                 }
1750                 if (ht_realtek_agg_len >= 5) {
1751                         network->realtek_cap_exit = true;
1752                         network->bssht.bd_rt2rt_aggregation = true;
1753
1754                         if ((ht_realtek_agg_buf[4] == 1) &&
1755                             (ht_realtek_agg_buf[5] & 0x02))
1756                                 network->bssht.bd_rt2rt_long_slot_time = true;
1757
1758                         if ((ht_realtek_agg_buf[4] == 1) &&
1759                             (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1760                                 network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
1761                 }
1762         }
1763         if (ht_realtek_agg_len >= 5) {
1764                 if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1765                         network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
1766         }
1767
1768         if ((info_element->len >= 3 &&
1769              info_element->data[0] == 0x00 &&
1770              info_element->data[1] == 0x05 &&
1771              info_element->data[2] == 0xb5) ||
1772              (info_element->len >= 3 &&
1773              info_element->data[0] == 0x00 &&
1774              info_element->data[1] == 0x0a &&
1775              info_element->data[2] == 0xf7) ||
1776              (info_element->len >= 3 &&
1777              info_element->data[0] == 0x00 &&
1778              info_element->data[1] == 0x10 &&
1779              info_element->data[2] == 0x18)) {
1780                 network->broadcom_cap_exist = true;
1781         }
1782         if (info_element->len >= 3 &&
1783             info_element->data[0] == 0x00 &&
1784             info_element->data[1] == 0x0c &&
1785             info_element->data[2] == 0x43)
1786                 network->ralink_cap_exist = true;
1787         if ((info_element->len >= 3 &&
1788              info_element->data[0] == 0x00 &&
1789              info_element->data[1] == 0x03 &&
1790              info_element->data[2] == 0x7f) ||
1791              (info_element->len >= 3 &&
1792              info_element->data[0] == 0x00 &&
1793              info_element->data[1] == 0x13 &&
1794              info_element->data[2] == 0x74))
1795                 network->atheros_cap_exist = true;
1796
1797         if ((info_element->len >= 3 &&
1798              info_element->data[0] == 0x00 &&
1799              info_element->data[1] == 0x50 &&
1800              info_element->data[2] == 0x43))
1801                 network->marvell_cap_exist = true;
1802         if (info_element->len >= 3 &&
1803             info_element->data[0] == 0x00 &&
1804             info_element->data[1] == 0x40 &&
1805             info_element->data[2] == 0x96)
1806                 network->cisco_cap_exist = true;
1807
1808         if (info_element->len >= 3 &&
1809             info_element->data[0] == 0x00 &&
1810             info_element->data[1] == 0x0a &&
1811             info_element->data[2] == 0xf5)
1812                 network->airgo_cap_exist = true;
1813
1814         if (info_element->len > 4 &&
1815             info_element->data[0] == 0x00 &&
1816             info_element->data[1] == 0x40 &&
1817             info_element->data[2] == 0x96 &&
1818             info_element->data[3] == 0x01) {
1819                 if (info_element->len == 6) {
1820                         memcpy(network->CcxRmState, &info_element->data[4], 2);
1821                         if (network->CcxRmState[0] != 0)
1822                                 network->bCcxRmEnable = true;
1823                         else
1824                                 network->bCcxRmEnable = false;
1825                         network->MBssidMask = network->CcxRmState[1] & 0x07;
1826                         if (network->MBssidMask != 0) {
1827                                 network->bMBssidValid = true;
1828                                 network->MBssidMask = 0xff <<
1829                                                       (network->MBssidMask);
1830                                 ether_addr_copy(network->MBssid,
1831                                                 network->bssid);
1832                                 network->MBssid[5] &= network->MBssidMask;
1833                         } else {
1834                                 network->bMBssidValid = false;
1835                         }
1836                 } else {
1837                         network->bCcxRmEnable = false;
1838                 }
1839         }
1840         if (info_element->len > 4  &&
1841             info_element->data[0] == 0x00 &&
1842             info_element->data[1] == 0x40 &&
1843             info_element->data[2] == 0x96 &&
1844             info_element->data[3] == 0x03) {
1845                 if (info_element->len == 5) {
1846                         network->bWithCcxVerNum = true;
1847                         network->BssCcxVerNumber = info_element->data[4];
1848                 } else {
1849                         network->bWithCcxVerNum = false;
1850                         network->BssCcxVerNumber = 0;
1851                 }
1852         }
1853         if (info_element->len > 4  &&
1854             info_element->data[0] == 0x00 &&
1855             info_element->data[1] == 0x50 &&
1856             info_element->data[2] == 0xf2 &&
1857             info_element->data[3] == 0x04) {
1858                 netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
1859                            info_element->len);
1860                 network->wzc_ie_len = min(info_element->len + 2, MAX_WZC_IE_LEN);
1861                 memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
1862         }
1863 }
1864
1865 static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
1866                                      struct rtllib_network *network,
1867                                      u16 *tmp_htcap_len)
1868 {
1869         struct bss_ht *ht = &network->bssht;
1870
1871         *tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
1872         if (*tmp_htcap_len != 0) {
1873                 ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
1874                 ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1875                                        sizeof(ht->bd_ht_cap_buf));
1876                 memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);
1877
1878                 ht->bd_support_ht = true;
1879                 ht->bd_ht_1r = ((((struct ht_capab_ele *)
1880                                 ht->bd_ht_cap_buf))->MCS[1]) == 0;
1881
1882                 ht->bd_bandwidth = (enum ht_channel_width)
1883                                              (((struct ht_capab_ele *)
1884                                              (ht->bd_ht_cap_buf))->ChlWidth);
1885         } else {
1886                 ht->bd_support_ht = false;
1887                 ht->bd_ht_1r = false;
1888                 ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
1889         }
1890 }
1891
1892 int rtllib_parse_info_param(struct rtllib_device *ieee,
1893                 struct rtllib_info_element *info_element,
1894                 u16 length,
1895                 struct rtllib_network *network,
1896                 struct rtllib_rx_stats *stats)
1897 {
1898         u8 i;
1899         short offset;
1900         u16     tmp_htcap_len = 0;
1901         u16     tmp_htinfo_len = 0;
1902         char rates_str[64];
1903         char *p;
1904
1905         while (length >= sizeof(*info_element)) {
1906                 if (sizeof(*info_element) + info_element->len > length) {
1907                         netdev_dbg(ieee->dev,
1908                                    "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
1909                                    info_element->len + sizeof(*info_element),
1910                                    length, info_element->id);
1911                         /* We stop processing but don't return an error here
1912                          * because some misbehaviour APs break this rule. ie.
1913                          * Orinoco AP1000.
1914                          */
1915                         break;
1916                 }
1917
1918                 switch (info_element->id) {
1919                 case MFIE_TYPE_SSID:
1920                         if (rtllib_is_empty_essid(info_element->data,
1921                                                      info_element->len)) {
1922                                 network->flags |= NETWORK_EMPTY_ESSID;
1923                                 break;
1924                         }
1925
1926                         network->ssid_len = min(info_element->len,
1927                                                 (u8)IW_ESSID_MAX_SIZE);
1928                         memcpy(network->ssid, info_element->data,
1929                                network->ssid_len);
1930                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
1931                                 memset(network->ssid + network->ssid_len, 0,
1932                                        IW_ESSID_MAX_SIZE - network->ssid_len);
1933
1934                         netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
1935                                    network->ssid, network->ssid_len);
1936                         break;
1937
1938                 case MFIE_TYPE_RATES:
1939                         p = rates_str;
1940                         network->rates_len = min(info_element->len,
1941                                                  MAX_RATES_LENGTH);
1942                         for (i = 0; i < network->rates_len; i++) {
1943                                 network->rates[i] = info_element->data[i];
1944                                 p += scnprintf(p, sizeof(rates_str) -
1945                                               (p - rates_str), "%02X ",
1946                                               network->rates[i]);
1947                                 if (rtllib_is_ofdm_rate
1948                                     (info_element->data[i])) {
1949                                         network->flags |= NETWORK_HAS_OFDM;
1950                                         if (info_element->data[i] &
1951                                             RTLLIB_BASIC_RATE_MASK)
1952                                                 network->flags &=
1953                                                     ~NETWORK_HAS_CCK;
1954                                 }
1955
1956                                 if (rtllib_is_cck_rate
1957                                     (info_element->data[i])) {
1958                                         network->flags |= NETWORK_HAS_CCK;
1959                                 }
1960                         }
1961
1962                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
1963                                    rates_str, network->rates_len);
1964                         break;
1965
1966                 case MFIE_TYPE_RATES_EX:
1967                         p = rates_str;
1968                         network->rates_ex_len = min(info_element->len,
1969                                                     MAX_RATES_EX_LENGTH);
1970                         for (i = 0; i < network->rates_ex_len; i++) {
1971                                 network->rates_ex[i] = info_element->data[i];
1972                                 p += scnprintf(p, sizeof(rates_str) -
1973                                               (p - rates_str), "%02X ",
1974                                               network->rates_ex[i]);
1975                                 if (rtllib_is_ofdm_rate
1976                                     (info_element->data[i])) {
1977                                         network->flags |= NETWORK_HAS_OFDM;
1978                                         if (info_element->data[i] &
1979                                             RTLLIB_BASIC_RATE_MASK)
1980                                                 network->flags &=
1981                                                     ~NETWORK_HAS_CCK;
1982                                 }
1983                         }
1984
1985                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1986                                    rates_str, network->rates_ex_len);
1987                         break;
1988
1989                 case MFIE_TYPE_DS_SET:
1990                         netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
1991                                    info_element->data[0]);
1992                         network->channel = info_element->data[0];
1993                         break;
1994
1995                 case MFIE_TYPE_FH_SET:
1996                         netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
1997                         break;
1998
1999                 case MFIE_TYPE_CF_SET:
2000                         netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
2001                         break;
2002
2003                 case MFIE_TYPE_TIM:
2004                         if (info_element->len < 4)
2005                                 break;
2006
2007                         network->tim.tim_count = info_element->data[0];
2008                         network->tim.tim_period = info_element->data[1];
2009
2010                         network->dtim_period = info_element->data[1];
2011                         if (ieee->link_state != MAC80211_LINKED)
2012                                 break;
2013                         network->last_dtim_sta_time = jiffies;
2014
2015                         network->dtim_data = RTLLIB_DTIM_VALID;
2016
2017                         if (info_element->data[2] & 1)
2018                                 network->dtim_data |= RTLLIB_DTIM_MBCAST;
2019
2020                         offset = (info_element->data[2] >> 1) * 2;
2021
2022                         if (ieee->assoc_id < 8 * offset ||
2023                             ieee->assoc_id > 8 * (offset + info_element->len - 3))
2024                                 break;
2025
2026                         offset = (ieee->assoc_id / 8) - offset;
2027                         if (info_element->data[3 + offset] &
2028                            (1 << (ieee->assoc_id % 8)))
2029                                 network->dtim_data |= RTLLIB_DTIM_UCAST;
2030
2031                         network->listen_interval = network->dtim_period;
2032                         break;
2033
2034                 case MFIE_TYPE_ERP:
2035                         network->erp_value = info_element->data[0];
2036                         network->flags |= NETWORK_HAS_ERP_VALUE;
2037                         netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
2038                                    network->erp_value);
2039                         break;
2040                 case MFIE_TYPE_IBSS_SET:
2041                         network->atim_window = info_element->data[0];
2042                         netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
2043                                    network->atim_window);
2044                         break;
2045
2046                 case MFIE_TYPE_CHALLENGE:
2047                         netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
2048                         break;
2049
2050                 case MFIE_TYPE_GENERIC:
2051                         netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
2052                                    info_element->len);
2053
2054                         rtllib_parse_mife_generic(ieee, info_element, network,
2055                                                   &tmp_htcap_len,
2056                                                   &tmp_htinfo_len);
2057                         break;
2058
2059                 case MFIE_TYPE_RSN:
2060                         netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
2061                                    info_element->len);
2062                         network->rsn_ie_len = min(info_element->len + 2,
2063                                                   MAX_WPA_IE_LEN);
2064                         memcpy(network->rsn_ie, info_element,
2065                                network->rsn_ie_len);
2066                         break;
2067
2068                 case MFIE_TYPE_HT_CAP:
2069                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
2070                                    info_element->len);
2071
2072                         rtllib_parse_mfie_ht_cap(info_element, network,
2073                                                  &tmp_htcap_len);
2074                         break;
2075
2076                 case MFIE_TYPE_HT_INFO:
2077                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
2078                                    info_element->len);
2079                         tmp_htinfo_len = min_t(u8, info_element->len,
2080                                                MAX_IE_LEN);
2081                         if (tmp_htinfo_len) {
2082                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
2083                                 network->bssht.bd_ht_info_len = tmp_htinfo_len >
2084                                         sizeof(network->bssht.bd_ht_info_buf) ?
2085                                         sizeof(network->bssht.bd_ht_info_buf) :
2086                                         tmp_htinfo_len;
2087                                 memcpy(network->bssht.bd_ht_info_buf,
2088                                        info_element->data,
2089                                        network->bssht.bd_ht_info_len);
2090                         }
2091                         break;
2092
2093                 case MFIE_TYPE_AIRONET:
2094                         netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
2095                                    info_element->len);
2096                         if (info_element->len > IE_CISCO_FLAG_POSITION) {
2097                                 network->bWithAironetIE = true;
2098
2099                                 if ((info_element->data[IE_CISCO_FLAG_POSITION]
2100                                      & SUPPORT_CKIP_MIC) ||
2101                                      (info_element->data[IE_CISCO_FLAG_POSITION]
2102                                      & SUPPORT_CKIP_PK))
2103                                         network->bCkipSupported = true;
2104                                 else
2105                                         network->bCkipSupported = false;
2106                         } else {
2107                                 network->bWithAironetIE = false;
2108                                 network->bCkipSupported = false;
2109                         }
2110                         break;
2111                 case MFIE_TYPE_QOS_PARAMETER:
2112                         netdev_err(ieee->dev,
2113                                    "QoS Error need to parse QOS_PARAMETER IE\n");
2114                         break;
2115
2116                 case MFIE_TYPE_COUNTRY:
2117                         netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
2118                                    info_element->len);
2119                         break;
2120 /* TODO */
2121                 default:
2122                         netdev_dbg(ieee->dev,
2123                                    "Unsupported info element: %s (%d)\n",
2124                                    get_info_element_string(info_element->id),
2125                                    info_element->id);
2126                         break;
2127                 }
2128
2129                 length -= sizeof(*info_element) + info_element->len;
2130                 info_element =
2131                     (struct rtllib_info_element *)&info_element->data[info_element->len];
2132         }
2133
2134         if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2135             !network->cisco_cap_exist && !network->ralink_cap_exist &&
2136             !network->bssht.bd_rt2rt_aggregation)
2137                 network->unknown_cap_exist = true;
2138         else
2139                 network->unknown_cap_exist = false;
2140         return 0;
2141 }
2142
2143 static long rtllib_translate_todbm(u8 signal_strength_index)
2144 {
2145         long    signal_power;
2146
2147         signal_power = (long)((signal_strength_index + 1) >> 1);
2148         signal_power -= 95;
2149
2150         return signal_power;
2151 }
2152
2153 static inline int rtllib_network_init(
2154         struct rtllib_device *ieee,
2155         struct rtllib_probe_response *beacon,
2156         struct rtllib_network *network,
2157         struct rtllib_rx_stats *stats)
2158 {
2159         memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2160
2161         /* Pull out fixed field data */
2162         ether_addr_copy(network->bssid, beacon->header.addr3);
2163         network->capability = le16_to_cpu(beacon->capability);
2164         network->last_scanned = jiffies;
2165         network->time_stamp[0] = beacon->time_stamp[0];
2166         network->time_stamp[1] = beacon->time_stamp[1];
2167         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
2168         /* Where to pull this? beacon->listen_interval;*/
2169         network->listen_interval = 0x0A;
2170         network->rates_len = network->rates_ex_len = 0;
2171         network->ssid_len = 0;
2172         network->hidden_ssid_len = 0;
2173         memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2174         network->flags = 0;
2175         network->atim_window = 0;
2176         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2177             0x3 : 0x0;
2178         network->berp_info_valid = false;
2179         network->broadcom_cap_exist = false;
2180         network->ralink_cap_exist = false;
2181         network->atheros_cap_exist = false;
2182         network->cisco_cap_exist = false;
2183         network->unknown_cap_exist = false;
2184         network->realtek_cap_exit = false;
2185         network->marvell_cap_exist = false;
2186         network->airgo_cap_exist = false;
2187         network->Turbo_Enable = 0;
2188         network->SignalStrength = stats->SignalStrength;
2189         network->RSSI = stats->SignalStrength;
2190         network->CountryIeLen = 0;
2191         memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2192         ht_initialize_bss_desc(&network->bssht);
2193         network->flags |= NETWORK_HAS_CCK;
2194
2195         network->wpa_ie_len = 0;
2196         network->rsn_ie_len = 0;
2197         network->wzc_ie_len = 0;
2198
2199         if (rtllib_parse_info_param(ieee,
2200                         beacon->info_element,
2201                         (stats->len - sizeof(*beacon)),
2202                         network,
2203                         stats))
2204                 return 1;
2205
2206         network->mode = 0;
2207
2208         if (network->flags & NETWORK_HAS_OFDM)
2209                 network->mode |= WIRELESS_MODE_G;
2210         if (network->flags & NETWORK_HAS_CCK)
2211                 network->mode |= WIRELESS_MODE_B;
2212
2213         if (network->mode == 0) {
2214                 netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
2215                            escape_essid(network->ssid, network->ssid_len),
2216                            network->bssid);
2217                 return 1;
2218         }
2219
2220         if (network->bssht.bd_support_ht) {
2221                 if (network->mode & (WIRELESS_MODE_G | WIRELESS_MODE_B))
2222                         network->mode = WIRELESS_MODE_N_24G;
2223         }
2224         if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2225                 network->flags |= NETWORK_EMPTY_ESSID;
2226         stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2227         stats->noise = rtllib_translate_todbm((u8)(100 - stats->signal)) - 25;
2228
2229         memcpy(&network->stats, stats, sizeof(network->stats));
2230
2231         return 0;
2232 }
2233
2234 static inline int is_same_network(struct rtllib_network *src,
2235                                   struct rtllib_network *dst, u8 ssidbroad)
2236 {
2237         /* A network is only a duplicate if the channel, BSSID, ESSID
2238          * and the capability field (in particular IBSS and BSS) all match.
2239          * We treat all <hidden> with the same BSSID and channel
2240          * as one network
2241          */
2242         return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2243                 (src->channel == dst->channel) &&
2244                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2245                 (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2246                 (!ssidbroad)) &&
2247                 ((src->capability & WLAN_CAPABILITY_IBSS) ==
2248                 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2249                 ((src->capability & WLAN_CAPABILITY_ESS) ==
2250                 (dst->capability & WLAN_CAPABILITY_ESS)));
2251 }
2252
2253 static inline void update_network(struct rtllib_device *ieee,
2254                                   struct rtllib_network *dst,
2255                                   struct rtllib_network *src)
2256 {
2257         int qos_active;
2258         u8 old_param;
2259
2260         memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2261         dst->capability = src->capability;
2262         memcpy(dst->rates, src->rates, src->rates_len);
2263         dst->rates_len = src->rates_len;
2264         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2265         dst->rates_ex_len = src->rates_ex_len;
2266         if (src->ssid_len > 0) {
2267                 if (dst->ssid_len == 0) {
2268                         memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2269                         dst->hidden_ssid_len = src->ssid_len;
2270                         memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2271                 } else {
2272                         memset(dst->ssid, 0, dst->ssid_len);
2273                         dst->ssid_len = src->ssid_len;
2274                         memcpy(dst->ssid, src->ssid, src->ssid_len);
2275                 }
2276         }
2277         dst->mode = src->mode;
2278         dst->flags = src->flags;
2279         dst->time_stamp[0] = src->time_stamp[0];
2280         dst->time_stamp[1] = src->time_stamp[1];
2281         if (src->flags & NETWORK_HAS_ERP_VALUE) {
2282                 dst->erp_value = src->erp_value;
2283                 dst->berp_info_valid = src->berp_info_valid = true;
2284         }
2285         dst->beacon_interval = src->beacon_interval;
2286         dst->listen_interval = src->listen_interval;
2287         dst->atim_window = src->atim_window;
2288         dst->dtim_period = src->dtim_period;
2289         dst->dtim_data = src->dtim_data;
2290         dst->last_dtim_sta_time = src->last_dtim_sta_time;
2291         memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2292
2293         dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
2294         dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
2295         dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
2296         memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
2297                src->bssht.bd_ht_cap_len);
2298         dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
2299         memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
2300                src->bssht.bd_ht_info_len);
2301         dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
2302         dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
2303         dst->broadcom_cap_exist = src->broadcom_cap_exist;
2304         dst->ralink_cap_exist = src->ralink_cap_exist;
2305         dst->atheros_cap_exist = src->atheros_cap_exist;
2306         dst->realtek_cap_exit = src->realtek_cap_exit;
2307         dst->marvell_cap_exist = src->marvell_cap_exist;
2308         dst->cisco_cap_exist = src->cisco_cap_exist;
2309         dst->airgo_cap_exist = src->airgo_cap_exist;
2310         dst->unknown_cap_exist = src->unknown_cap_exist;
2311         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2312         dst->wpa_ie_len = src->wpa_ie_len;
2313         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2314         dst->rsn_ie_len = src->rsn_ie_len;
2315         memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2316         dst->wzc_ie_len = src->wzc_ie_len;
2317
2318         dst->last_scanned = jiffies;
2319         /* qos related parameters */
2320         qos_active = dst->qos_data.active;
2321         old_param = dst->qos_data.param_count;
2322         dst->qos_data.supported = src->qos_data.supported;
2323         if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2324                 memcpy(&dst->qos_data, &src->qos_data,
2325                        sizeof(struct rtllib_qos_data));
2326         if (dst->qos_data.supported == 1) {
2327                 if (dst->ssid_len)
2328                         netdev_dbg(ieee->dev,
2329                                    "QoS the network %s is QoS supported\n",
2330                                    dst->ssid);
2331                 else
2332                         netdev_dbg(ieee->dev,
2333                                    "QoS the network is QoS supported\n");
2334         }
2335         dst->qos_data.active = qos_active;
2336         dst->qos_data.old_param_count = old_param;
2337
2338         dst->wmm_info = src->wmm_info;
2339         if (src->wmm_param[0].ac_aci_acm_aifsn ||
2340            src->wmm_param[1].ac_aci_acm_aifsn ||
2341            src->wmm_param[2].ac_aci_acm_aifsn ||
2342            src->wmm_param[3].ac_aci_acm_aifsn)
2343                 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2344
2345         dst->SignalStrength = src->SignalStrength;
2346         dst->RSSI = src->RSSI;
2347         dst->Turbo_Enable = src->Turbo_Enable;
2348
2349         dst->CountryIeLen = src->CountryIeLen;
2350         memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2351
2352         dst->bWithAironetIE = src->bWithAironetIE;
2353         dst->bCkipSupported = src->bCkipSupported;
2354         memcpy(dst->CcxRmState, src->CcxRmState, 2);
2355         dst->bCcxRmEnable = src->bCcxRmEnable;
2356         dst->MBssidMask = src->MBssidMask;
2357         dst->bMBssidValid = src->bMBssidValid;
2358         memcpy(dst->MBssid, src->MBssid, 6);
2359         dst->bWithCcxVerNum = src->bWithCcxVerNum;
2360         dst->BssCcxVerNumber = src->BssCcxVerNumber;
2361 }
2362
2363 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2364 {
2365         if (channel > MAX_CHANNEL_NUMBER) {
2366                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2367                 return 0;
2368         }
2369
2370         if (rtllib->active_channel_map[channel] == 2)
2371                 return 1;
2372
2373         return 0;
2374 }
2375
2376 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2377 {
2378         if (channel > MAX_CHANNEL_NUMBER) {
2379                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2380                 return 0;
2381         }
2382         if (rtllib->active_channel_map[channel] > 0)
2383                 return 1;
2384
2385         return 0;
2386 }
2387 EXPORT_SYMBOL(rtllib_legal_channel);
2388
2389 static inline void rtllib_process_probe_response(
2390         struct rtllib_device *ieee,
2391         struct rtllib_probe_response *beacon,
2392         struct rtllib_rx_stats *stats)
2393 {
2394         struct rtllib_network *target;
2395         struct rtllib_network *oldest = NULL;
2396         struct rtllib_info_element *info_element = &beacon->info_element[0];
2397         unsigned long flags;
2398         short renew;
2399         struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2400                                                  GFP_ATOMIC);
2401         __le16 frame_ctl = beacon->header.frame_control;
2402
2403         if (!network)
2404                 return;
2405
2406         netdev_dbg(ieee->dev,
2407                    "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2408                    escape_essid(info_element->data, info_element->len),
2409                    beacon->header.addr3,
2410                    (le16_to_cpu(beacon->capability) & (1 << 0xf)) ? '1' : '0',
2411                    (le16_to_cpu(beacon->capability) & (1 << 0xe)) ? '1' : '0',
2412                    (le16_to_cpu(beacon->capability) & (1 << 0xd)) ? '1' : '0',
2413                    (le16_to_cpu(beacon->capability) & (1 << 0xc)) ? '1' : '0',
2414                    (le16_to_cpu(beacon->capability) & (1 << 0xb)) ? '1' : '0',
2415                    (le16_to_cpu(beacon->capability) & (1 << 0xa)) ? '1' : '0',
2416                    (le16_to_cpu(beacon->capability) & (1 << 0x9)) ? '1' : '0',
2417                    (le16_to_cpu(beacon->capability) & (1 << 0x8)) ? '1' : '0',
2418                    (le16_to_cpu(beacon->capability) & (1 << 0x7)) ? '1' : '0',
2419                    (le16_to_cpu(beacon->capability) & (1 << 0x6)) ? '1' : '0',
2420                    (le16_to_cpu(beacon->capability) & (1 << 0x5)) ? '1' : '0',
2421                    (le16_to_cpu(beacon->capability) & (1 << 0x4)) ? '1' : '0',
2422                    (le16_to_cpu(beacon->capability) & (1 << 0x3)) ? '1' : '0',
2423                    (le16_to_cpu(beacon->capability) & (1 << 0x2)) ? '1' : '0',
2424                    (le16_to_cpu(beacon->capability) & (1 << 0x1)) ? '1' : '0',
2425                    (le16_to_cpu(beacon->capability) & (1 << 0x0)) ? '1' : '0');
2426
2427         if (rtllib_network_init(ieee, beacon, network, stats)) {
2428                 netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
2429                            escape_essid(info_element->data, info_element->len),
2430                            beacon->header.addr3,
2431                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2432                 goto free_network;
2433         }
2434
2435         if (!rtllib_legal_channel(ieee, network->channel))
2436                 goto free_network;
2437
2438         if (ieee80211_is_probe_resp(frame_ctl)) {
2439                 if (IsPassiveChannel(ieee, network->channel)) {
2440                         netdev_info(ieee->dev,
2441                                     "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
2442                                     network->channel);
2443                         goto free_network;
2444                 }
2445         }
2446
2447         /* The network parsed correctly -- so now we scan our known networks
2448          * to see if we can find it in our list.
2449          *
2450          * NOTE:  This search is definitely not optimized.  Once its doing
2451          *      the "right thing" we'll optimize it for efficiency if
2452          *      necessary
2453          */
2454
2455         /* Search for this entry in the list and update it if it is
2456          * already there.
2457          */
2458
2459         spin_lock_irqsave(&ieee->lock, flags);
2460         if (is_same_network(&ieee->current_network, network,
2461            (network->ssid_len ? 1 : 0))) {
2462                 update_network(ieee, &ieee->current_network, network);
2463                 if ((ieee->current_network.mode == WIRELESS_MODE_N_24G ||
2464                      ieee->current_network.mode == WIRELESS_MODE_G) &&
2465                     ieee->current_network.berp_info_valid) {
2466                         if (ieee->current_network.erp_value & ERP_UseProtection)
2467                                 ieee->current_network.buseprotection = true;
2468                         else
2469                                 ieee->current_network.buseprotection = false;
2470                 }
2471                 if (ieee80211_is_beacon(frame_ctl)) {
2472                         if (ieee->link_state >= MAC80211_LINKED)
2473                                 ieee->link_detect_info.NumRecvBcnInPeriod++;
2474                 }
2475         }
2476         list_for_each_entry(target, &ieee->network_list, list) {
2477                 if (is_same_network(target, network,
2478                    (target->ssid_len ? 1 : 0)))
2479                         break;
2480                 if (!oldest || (target->last_scanned < oldest->last_scanned))
2481                         oldest = target;
2482         }
2483
2484         /* If we didn't find a match, then get a new network slot to initialize
2485          * with this beacon's information
2486          */
2487         if (&target->list == &ieee->network_list) {
2488                 if (list_empty(&ieee->network_free_list)) {
2489                         /* If there are no more slots, expire the oldest */
2490                         list_del(&oldest->list);
2491                         target = oldest;
2492                         netdev_dbg(ieee->dev,
2493                                    "Expired '%s' ( %pM) from network list.\n",
2494                                    escape_essid(target->ssid, target->ssid_len),
2495                                    target->bssid);
2496                 } else {
2497                         /* Otherwise just pull from the free list */
2498                         target = list_entry(ieee->network_free_list.next,
2499                                             struct rtllib_network, list);
2500                         list_del(ieee->network_free_list.next);
2501                 }
2502
2503                 netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
2504                            escape_essid(network->ssid, network->ssid_len),
2505                            network->bssid,
2506                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2507
2508                 memcpy(target, network, sizeof(*target));
2509                 list_add_tail(&target->list, &ieee->network_list);
2510                 if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2511                         rtllib_softmac_new_net(ieee, network);
2512         } else {
2513                 netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
2514                            escape_essid(target->ssid, target->ssid_len),
2515                            target->bssid,
2516                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2517
2518                 /* we have an entry and we are going to update it. But this
2519                  *  entry may be already expired. In this case we do the same
2520                  * as we found a new net and call the new_net handler
2521                  */
2522                 renew = !time_after(target->last_scanned + ieee->scan_age,
2523                                     jiffies);
2524                 if ((!target->ssid_len) &&
2525                     (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2526                     || ((ieee->current_network.ssid_len == network->ssid_len) &&
2527                     (strncmp(ieee->current_network.ssid, network->ssid,
2528                     network->ssid_len) == 0) &&
2529                     (ieee->link_state == MAC80211_NOLINK))))
2530                         renew = 1;
2531                 update_network(ieee, target, network);
2532                 if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2533                         rtllib_softmac_new_net(ieee, network);
2534         }
2535
2536         spin_unlock_irqrestore(&ieee->lock, flags);
2537         if (ieee80211_is_beacon(frame_ctl) &&
2538             is_same_network(&ieee->current_network, network,
2539             (network->ssid_len ? 1 : 0)) &&
2540             (ieee->link_state == MAC80211_LINKED)) {
2541                 ieee->handle_beacon(ieee->dev, beacon, &ieee->current_network);
2542         }
2543 free_network:
2544         kfree(network);
2545 }
2546
2547 static void rtllib_rx_mgt(struct rtllib_device *ieee,
2548                           struct sk_buff *skb,
2549                           struct rtllib_rx_stats *stats)
2550 {
2551         struct ieee80211_hdr *header = (struct ieee80211_hdr *)skb->data;
2552
2553         if (!ieee80211_is_probe_resp(header->frame_control) &&
2554             (!ieee80211_is_beacon(header->frame_control)))
2555                 ieee->last_rx_ps_time = jiffies;
2556
2557         if (ieee80211_is_beacon(header->frame_control)) {
2558                 netdev_dbg(ieee->dev, "received BEACON\n");
2559                 rtllib_process_probe_response(
2560                                 ieee, (struct rtllib_probe_response *)header,
2561                                 stats);
2562
2563                 if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2564                     ieee->iw_mode == IW_MODE_INFRA &&
2565                     ieee->link_state == MAC80211_LINKED))
2566                         schedule_work(&ieee->ps_task);
2567         } else if (ieee80211_is_probe_resp(header->frame_control)) {
2568                 netdev_dbg(ieee->dev, "received PROBE RESPONSE\n");
2569                 rtllib_process_probe_response(ieee,
2570                               (struct rtllib_probe_response *)header, stats);
2571         }
2572 }