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_flush_rx_ts_pending_pkts(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         return hdrlen;
 869 }
 870
 871 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
 872                                      struct sk_buff *skb, u8 multicast)
 873 {
 874         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 875         u16 fc, sc;
 876         u8 frag;
 877
 878         fc = le16_to_cpu(hdr->frame_control);
 879         sc = le16_to_cpu(hdr->seq_ctrl);
 880         frag = WLAN_GET_SEQ_FRAG(sc);
 881
 882         if (!ieee->ht_info->cur_rx_reorder_enable ||
 883                 !ieee->current_network.qos_data.active ||
 884                 !IsDataFrame(skb->data) ||
 885                 IsLegacyDataFrame(skb->data)) {
 886                 if (!ieee80211_is_beacon(hdr->frame_control)) {
 887                         if (is_duplicate_packet(ieee, hdr))
 888                                 return -1;
 889                 }
 890         } else {
 891                 struct rx_ts_record *ts = NULL;
 892
 893                 if (rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2,
 894                         (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
 895                         if ((fc & (1 << 11)) && (frag == ts->rx_last_frag_num) &&
 896                             (WLAN_GET_SEQ_SEQ(sc) == ts->rx_last_seq_num))
 897                                 return -1;
 898                         ts->rx_last_frag_num = frag;
 899                         ts->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
 900                 } else {
 901                         netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
 902                                     __func__);
 903                         return -1;
 904                 }
 905         }
 906
 907         return 0;
 908 }
 909
 910 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
 911                                    struct ieee80211_hdr *hdr, u8 *dst,
 912                                    u8 *src, u8 *bssid)
 913 {
 914         u16 fc = le16_to_cpu(hdr->frame_control);
 915
 916         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 917         case IEEE80211_FCTL_FROMDS:
 918                 ether_addr_copy(dst, hdr->addr1);
 919                 ether_addr_copy(src, hdr->addr3);
 920                 ether_addr_copy(bssid, hdr->addr2);
 921                 break;
 922         case IEEE80211_FCTL_TODS:
 923                 ether_addr_copy(dst, hdr->addr3);
 924                 ether_addr_copy(src, hdr->addr2);
 925                 ether_addr_copy(bssid, hdr->addr1);
 926                 break;
 927         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 928                 ether_addr_copy(dst, hdr->addr3);
 929                 ether_addr_copy(src, hdr->addr4);
 930                 ether_addr_copy(bssid, ieee->current_network.bssid);
 931                 break;
 932         default:
 933                 ether_addr_copy(dst, hdr->addr1);
 934                 ether_addr_copy(src, hdr->addr2);
 935                 ether_addr_copy(bssid, hdr->addr3);
 936                 break;
 937         }
 938 }
 939
 940 static int rtllib_rx_data_filter(struct rtllib_device *ieee, struct ieee80211_hdr *hdr,
 941                                  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
 942 {
 943         u16 fc = le16_to_cpu(hdr->frame_control);
 944         u8 type = WLAN_FC_GET_TYPE(fc);
 945         u8 stype = WLAN_FC_GET_STYPE(fc);
 946
 947         /* Filter frames from different BSS */
 948         if (ieee80211_has_a4(hdr->frame_control) &&
 949             !ether_addr_equal(ieee->current_network.bssid, bssid) &&
 950             !is_zero_ether_addr(ieee->current_network.bssid)) {
 951                 return -1;
 952         }
 953
 954         /* Nullfunc frames may have PS-bit set, so they must be passed to
 955          * hostap_handle_sta_rx() before being dropped here.
 956          */
 957         if (stype != IEEE80211_STYPE_DATA &&
 958             stype != IEEE80211_STYPE_DATA_CFACK &&
 959             stype != IEEE80211_STYPE_DATA_CFPOLL &&
 960             stype != IEEE80211_STYPE_DATA_CFACKPOLL &&
 961             stype != IEEE80211_STYPE_QOS_DATA) {
 962                 if (stype != IEEE80211_STYPE_NULLFUNC)
 963                         netdev_dbg(ieee->dev,
 964                                    "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
 965                                    type, stype);
 966                 return -1;
 967         }
 968
 969         /* packets from our adapter are dropped (echo) */
 970         if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
 971                 return -1;
 972
 973         /* {broad,multi}cast packets to our BSS go through */
 974         if (is_multicast_ether_addr(dst)) {
 975                 if (memcmp(bssid, ieee->current_network.bssid,
 976                            ETH_ALEN))
 977                         return -1;
 978         }
 979         return 0;
 980 }
 981
 982 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
 983                         struct lib80211_crypt_data **crypt, size_t hdrlen)
 984 {
 985         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 986         u16 fc = le16_to_cpu(hdr->frame_control);
 987         int idx = 0;
 988
 989         if (skb->len >= hdrlen + 3)
 990                 idx = skb->data[hdrlen + 3] >> 6;
 991
 992         *crypt = ieee->crypt_info.crypt[idx];
 993         /* allow NULL decrypt to indicate an station specific override
 994          * for default encryption
 995          */
 996         if (*crypt && (!(*crypt)->ops || !(*crypt)->ops->decrypt_mpdu))
 997                 *crypt = NULL;
 998
 999         if (!*crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
1000                 /* This seems to be triggered by some (multicast?)
1001                  * frames from other than current BSS, so just drop the
1002                  * frames silently instead of filling system log with
1003                  * these reports.
1004                  */
1005                 netdev_dbg(ieee->dev,
1006                            "Decryption failed (not set) (SA= %pM)\n",
1007                            hdr->addr2);
1008                 return -1;
1009         }
1010
1011         return 0;
1012 }
1013
1014 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1015                       struct rtllib_rx_stats *rx_stats,
1016                       struct lib80211_crypt_data *crypt, size_t hdrlen)
1017 {
1018         struct ieee80211_hdr *hdr;
1019         int keyidx = 0;
1020         u16 fc, sc;
1021         u8 frag;
1022
1023         hdr = (struct ieee80211_hdr *)skb->data;
1024         fc = le16_to_cpu(hdr->frame_control);
1025         sc = le16_to_cpu(hdr->seq_ctrl);
1026         frag = WLAN_GET_SEQ_FRAG(sc);
1027
1028         if ((!rx_stats->Decrypted))
1029                 ieee->need_sw_enc = 1;
1030         else
1031                 ieee->need_sw_enc = 0;
1032
1033         keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1034         if ((fc & IEEE80211_FCTL_PROTECTED) && (keyidx < 0)) {
1035                 netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
1036                 return -1;
1037         }
1038
1039         hdr = (struct ieee80211_hdr *)skb->data;
1040         if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
1041                 int flen;
1042                 struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1043
1044                 netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
1045
1046                 if (!frag_skb) {
1047                         netdev_dbg(ieee->dev,
1048                                    "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
1049                                    (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
1050                                    WLAN_GET_SEQ_SEQ(sc), frag);
1051                         return -1;
1052                 }
1053                 flen = skb->len;
1054                 if (frag != 0)
1055                         flen -= hdrlen;
1056
1057                 if (frag_skb->tail + flen > frag_skb->end) {
1058                         netdev_warn(ieee->dev,
1059                                     "%s: host decrypted and reassembled frame did not fit skb\n",
1060                                     __func__);
1061                         rtllib_frag_cache_invalidate(ieee, hdr);
1062                         return -1;
1063                 }
1064
1065                 if (frag == 0) {
1066                         /* copy first fragment (including full headers) into
1067                          * beginning of the fragment cache skb
1068                          */
1069                         skb_put_data(frag_skb, skb->data, flen);
1070                 } else {
1071                         /* append frame payload to the end of the fragment
1072                          * cache skb
1073                          */
1074                         skb_put_data(frag_skb, skb->data + hdrlen, flen);
1075                 }
1076                 dev_kfree_skb_any(skb);
1077                 skb = NULL;
1078
1079                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
1080                         /* more fragments expected - leave the skb in fragment
1081                          * cache for now; it will be delivered to upper layers
1082                          * after all fragments have been received
1083                          */
1084                         return -2;
1085                 }
1086
1087                 /* this was the last fragment and the frame will be
1088                  * delivered, so remove skb from fragment cache
1089                  */
1090                 skb = frag_skb;
1091                 hdr = (struct ieee80211_hdr *)skb->data;
1092                 rtllib_frag_cache_invalidate(ieee, hdr);
1093         }
1094
1095         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1096          * encrypted/authenticated
1097          */
1098         if ((fc & IEEE80211_FCTL_PROTECTED) &&
1099                 rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1100                 netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
1101                 return -1;
1102         }
1103
1104         hdr = (struct ieee80211_hdr *)skb->data;
1105         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
1106                 if (/*ieee->ieee802_1x &&*/
1107                     rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1108                         /* pass unencrypted EAPOL frames even if encryption is
1109                          * configured
1110                          */
1111                         struct eapol *eap = (struct eapol *)(skb->data +
1112                                 24);
1113                         netdev_dbg(ieee->dev,
1114                                    "RX: IEEE 802.1X EAPOL frame: %s\n",
1115                                    eap_get_type(eap->type));
1116                 } else {
1117                         netdev_dbg(ieee->dev,
1118                                    "encryption configured, but RX frame not encrypted (SA= %pM)\n",
1119                                    hdr->addr2);
1120                         return -1;
1121                 }
1122         }
1123
1124         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) &&
1125             rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1126                 struct eapol *eap = (struct eapol *)(skb->data + 24);
1127
1128                 netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
1129                            eap_get_type(eap->type));
1130         }
1131
1132         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
1133             !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1134                 netdev_dbg(ieee->dev,
1135                            "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
1136                            hdr->addr2);
1137                 return -1;
1138         }
1139
1140         return 0;
1141 }
1142
1143 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
1144                                       u8 nr_subframes)
1145 {
1146         if (unicast) {
1147                 if (ieee->link_state == MAC80211_LINKED) {
1148                         if (((ieee->link_detect_info.num_rx_unicast_ok_in_period +
1149                             ieee->link_detect_info.num_tx_ok_in_period) > 8) ||
1150                             (ieee->link_detect_info.num_rx_unicast_ok_in_period > 2)) {
1151                                 ieee->leisure_ps_leave(ieee->dev);
1152                         }
1153                 }
1154         }
1155         ieee->last_rx_ps_time = jiffies;
1156 }
1157
1158 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1159                 struct rtllib_rx_stats *rx_stats,
1160                 struct rtllib_rxb *rxb,
1161                 u8 *dst,
1162                 u8 *src)
1163 {
1164         struct net_device *dev = ieee->dev;
1165         u16 ethertype;
1166         int i = 0;
1167
1168         if (!rxb) {
1169                 netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
1170                 return;
1171         }
1172
1173         for (i = 0; i < rxb->nr_subframes; i++) {
1174                 struct sk_buff *sub_skb = rxb->subframes[i];
1175
1176                 if (sub_skb) {
1177                         /* convert hdr + possible LLC headers
1178                          * into Ethernet header
1179                          */
1180                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1181                         if (sub_skb->len >= 8 &&
1182                                 ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1183                                 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1184                                 memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1185                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
1186                                  * and replace EtherType
1187                                  */
1188                                 skb_pull(sub_skb, SNAP_SIZE);
1189                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1190                                                 src);
1191                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1192                                                 dst);
1193                         } else {
1194                                 u16 len;
1195                                 /* Leave Ethernet header part of hdr
1196                                  * and full payload
1197                                  */
1198                                 len = sub_skb->len;
1199                                 memcpy(skb_push(sub_skb, 2), &len, 2);
1200                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1201                                                 src);
1202                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1203                                                 dst);
1204                         }
1205
1206                         ieee->stats.rx_packets++;
1207                         ieee->stats.rx_bytes += sub_skb->len;
1208
1209                         if (is_multicast_ether_addr(dst))
1210                                 ieee->stats.multicast++;
1211
1212                         /* Indicate the packets to upper layer */
1213                         memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1214                         sub_skb->protocol = eth_type_trans(sub_skb, dev);
1215                         sub_skb->dev = dev;
1216                         sub_skb->dev->stats.rx_packets++;
1217                         sub_skb->dev->stats.rx_bytes += sub_skb->len;
1218                         /* 802.11 crc not sufficient */
1219                         sub_skb->ip_summed = CHECKSUM_NONE;
1220                         netif_rx(sub_skb);
1221                 }
1222         }
1223         kfree(rxb);
1224 }
1225
1226 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1227                  struct rtllib_rx_stats *rx_stats)
1228 {
1229         struct net_device *dev = ieee->dev;
1230         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1231         struct lib80211_crypt_data *crypt = NULL;
1232         struct rtllib_rxb *rxb = NULL;
1233         struct rx_ts_record *ts = NULL;
1234         u16 fc, sc, SeqNum = 0;
1235         u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1236         u8 dst[ETH_ALEN];
1237         u8 src[ETH_ALEN];
1238         u8 bssid[ETH_ALEN] = {0};
1239
1240         size_t hdrlen = 0;
1241         int ret = 0, i = 0;
1242
1243         fc = le16_to_cpu(hdr->frame_control);
1244         type = WLAN_FC_GET_TYPE(fc);
1245         stype = WLAN_FC_GET_STYPE(fc);
1246         sc = le16_to_cpu(hdr->seq_ctrl);
1247
1248         /*Filter pkt not to me*/
1249         multicast = is_multicast_ether_addr(hdr->addr1);
1250         unicast = !multicast;
1251         if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1))
1252                 goto rx_dropped;
1253
1254         /*Filter pkt has too small length */
1255         hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1256         if (skb->len < hdrlen) {
1257                 netdev_info(dev,
1258                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1259                             __func__);
1260                 goto rx_dropped;
1261         }
1262
1263         /* Filter Duplicate pkt */
1264         ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1265         if (ret < 0)
1266                 goto rx_dropped;
1267
1268         /* Filter CTRL Frame */
1269         if (type == RTLLIB_FTYPE_CTL)
1270                 goto rx_dropped;
1271
1272         /* Filter MGNT Frame */
1273         if (type == RTLLIB_FTYPE_MGMT) {
1274                 if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1275                         goto rx_dropped;
1276                 else
1277                         goto rx_exit;
1278         }
1279
1280         /* Filter WAPI DATA Frame */
1281
1282         /* Update statstics for AP roaming */
1283         ieee->link_detect_info.num_recv_data_in_period++;
1284         ieee->link_detect_info.num_rx_ok_in_period++;
1285
1286         /* Data frame - extract src/dst addresses */
1287         rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1288
1289         /* Filter Data frames */
1290         ret = rtllib_rx_data_filter(ieee, hdr, dst, src, bssid, hdr->addr2);
1291         if (ret < 0)
1292                 goto rx_dropped;
1293
1294         if (skb->len == hdrlen)
1295                 goto rx_dropped;
1296
1297         /* Send pspoll based on moredata */
1298         if ((ieee->iw_mode == IW_MODE_INFRA)  &&
1299             (ieee->sta_sleep == LPS_IS_SLEEP) &&
1300             (ieee->polling)) {
1301                 if (WLAN_FC_MORE_DATA(fc)) {
1302                         /* more data bit is set, let's request a new frame
1303                          * from the AP
1304                          */
1305                         rtllib_sta_ps_send_pspoll_frame(ieee);
1306                 } else {
1307                         ieee->polling =  false;
1308                 }
1309         }
1310
1311         /* Get crypt if encrypted */
1312         ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1313         if (ret == -1)
1314                 goto rx_dropped;
1315
1316         /* Decrypt data frame (including reassemble) */
1317         ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1318         if (ret == -1)
1319                 goto rx_dropped;
1320         else if (ret == -2)
1321                 goto rx_exit;
1322
1323         /* Get TS for Rx Reorder  */
1324         hdr = (struct ieee80211_hdr *)skb->data;
1325         if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1326                 && !is_multicast_ether_addr(hdr->addr1)) {
1327                 TID = Frame_QoSTID(skb->data);
1328                 SeqNum = WLAN_GET_SEQ_SEQ(sc);
1329                 rtllib_get_ts(ieee, (struct ts_common_info **)&ts, hdr->addr2, TID,
1330                       RX_DIR, true);
1331                 if (TID != 0 && TID != 3)
1332                         ieee->bis_any_nonbepkts = true;
1333         }
1334
1335         /* Parse rx data frame (For AMSDU) */
1336         /* skb: hdr + (possible reassembled) full plaintext payload */
1337         rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1338         if (!rxb)
1339                 goto rx_dropped;
1340
1341         /* to parse amsdu packets */
1342         /* qos data packets & reserved bit is 1 */
1343         if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1344                 /* only to free rxb, and not submit the packets
1345                  * to upper layer
1346                  */
1347                 for (i = 0; i < rxb->nr_subframes; i++)
1348                         dev_kfree_skb(rxb->subframes[i]);
1349                 kfree(rxb);
1350                 rxb = NULL;
1351                 goto rx_dropped;
1352         }
1353
1354         /* Update WAPI PN */
1355
1356         /* Check if leave LPS */
1357         if (ieee->is_aggregate_frame)
1358                 nr_subframes = rxb->nr_subframes;
1359         else
1360                 nr_subframes = 1;
1361         if (unicast)
1362                 ieee->link_detect_info.num_rx_unicast_ok_in_period += nr_subframes;
1363         rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1364
1365         /* Indicate packets to upper layer or Rx Reorder */
1366         if (!ieee->ht_info->cur_rx_reorder_enable || !ts)
1367                 rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1368         else
1369                 RxReorderIndicatePacket(ieee, rxb, ts, SeqNum);
1370
1371         dev_kfree_skb(skb);
1372
1373  rx_exit:
1374         return 1;
1375
1376  rx_dropped:
1377         ieee->stats.rx_dropped++;
1378
1379         /* Returning 0 indicates to caller that we have not handled the SKB--
1380          * so it is still allocated and can be used again by underlying
1381          * hardware as a DMA target
1382          */
1383         return 0;
1384 }
1385
1386 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1387                  struct rtllib_rx_stats *rx_stats)
1388 {
1389         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1390         u16 fc = le16_to_cpu(hdr->frame_control);
1391         size_t hdrlen = rtllib_get_hdrlen(fc);
1392
1393         if (skb->len < hdrlen) {
1394                 netdev_info(ieee->dev,
1395                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1396                             __func__);
1397                 return 0;
1398         }
1399
1400         if (ht_c_check(ieee, skb->data)) {
1401                 if (net_ratelimit())
1402                         netdev_info(ieee->dev, "%s: Find HTCControl!\n",
1403                                     __func__);
1404                 hdrlen += 4;
1405         }
1406
1407         ieee->stats.rx_packets++;
1408         ieee->stats.rx_bytes += skb->len;
1409         rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1410
1411         return 1;
1412 }
1413
1414 /* All received frames are sent to this function. @skb contains the frame in
1415  * IEEE 802.11 format, i.e., in the format it was sent over air.
1416  * This function is called only as a tasklet (software IRQ).
1417  */
1418 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1419                  struct rtllib_rx_stats *rx_stats)
1420 {
1421         int ret = 0;
1422
1423         if (!ieee || !skb || !rx_stats) {
1424                 pr_info("%s: Input parameters NULL!\n", __func__);
1425                 goto rx_dropped;
1426         }
1427         if (skb->len < 10) {
1428                 netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
1429                 goto rx_dropped;
1430         }
1431
1432         switch (ieee->iw_mode) {
1433         case IW_MODE_INFRA:
1434                 ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1435                 break;
1436         case IW_MODE_MONITOR:
1437                 ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1438                 break;
1439         default:
1440                 netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
1441                 break;
1442         }
1443
1444         return ret;
1445
1446  rx_dropped:
1447         if (ieee)
1448                 ieee->stats.rx_dropped++;
1449         return 0;
1450 }
1451 EXPORT_SYMBOL(rtllib_rx);
1452
1453 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1454
1455 /* Make ther structure we read from the beacon packet has the right values */
1456 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1457                                      *info_element, int sub_type)
1458 {
1459         if (info_element->elementID != QOS_ELEMENT_ID)
1460                 return -1;
1461         if (info_element->qui_subtype != sub_type)
1462                 return -1;
1463         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1464                 return -1;
1465         if (info_element->qui_type != QOS_OUI_TYPE)
1466                 return -1;
1467         if (info_element->version != QOS_VERSION_1)
1468                 return -1;
1469
1470         return 0;
1471 }
1472
1473 /* Parse a QoS parameter element */
1474 static int rtllib_read_qos_param_element(
1475                         struct rtllib_qos_parameter_info *element_param,
1476                         struct rtllib_info_element *info_element)
1477 {
1478         size_t size = sizeof(*element_param);
1479
1480         if (!element_param || !info_element || info_element->len != size - 2)
1481                 return -1;
1482
1483         memcpy(element_param, info_element, size);
1484         return rtllib_verify_qos_info(&element_param->info_element,
1485                                       QOS_OUI_PARAM_SUB_TYPE);
1486 }
1487
1488 /* Parse a QoS information element */
1489 static int rtllib_read_qos_info_element(
1490                         struct rtllib_qos_information_element *element_info,
1491                         struct rtllib_info_element *info_element)
1492 {
1493         size_t size = sizeof(*element_info);
1494
1495         if (!element_info || !info_element || info_element->len != size - 2)
1496                 return -1;
1497
1498         memcpy(element_info, info_element, size);
1499         return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
1500 }
1501
1502 /* Write QoS parameters from the ac parameters. */
1503 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1504                                                struct rtllib_qos_data *qos_data)
1505 {
1506         struct rtllib_qos_ac_parameter *ac_params;
1507         struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1508         int i;
1509         u8 aci;
1510         u8 acm;
1511
1512         qos_data->wmm_acm = 0;
1513         for (i = 0; i < QOS_QUEUE_NUM; i++) {
1514                 ac_params = &(param_elm->ac_params_record[i]);
1515
1516                 aci = (ac_params->aci_aifsn & 0x60) >> 5;
1517                 acm = (ac_params->aci_aifsn & 0x10) >> 4;
1518
1519                 if (aci >= QOS_QUEUE_NUM)
1520                         continue;
1521                 switch (aci) {
1522                 case 1:
1523                         /* BIT(0) | BIT(3) */
1524                         if (acm)
1525                                 qos_data->wmm_acm |= (0x01 << 0) | (0x01 << 3);
1526                         break;
1527                 case 2:
1528                         /* BIT(4) | BIT(5) */
1529                         if (acm)
1530                                 qos_data->wmm_acm |= (0x01 << 4) | (0x01 << 5);
1531                         break;
1532                 case 3:
1533                         /* BIT(6) | BIT(7) */
1534                         if (acm)
1535                                 qos_data->wmm_acm |= (0x01 << 6) | (0x01 << 7);
1536                         break;
1537                 case 0:
1538                 default:
1539                         /* BIT(1) | BIT(2) */
1540                         if (acm)
1541                                 qos_data->wmm_acm |= (0x01 << 1) | (0x01 << 2);
1542                         break;
1543                 }
1544
1545                 qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1546
1547                 /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1548                 qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
1549
1550                 qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
1551                                                      0x0F);
1552
1553                 qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
1554                                                       0xF0) >> 4);
1555
1556                 qos_param->flag[aci] =
1557                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1558                 qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
1559         }
1560         return 0;
1561 }
1562
1563 /* we have a generic data element which it may contain QoS information or
1564  * parameters element. check the information element length to decide
1565  * which type to read
1566  */
1567 static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
1568                                           struct rtllib_info_element
1569                                              *info_element,
1570                                           struct rtllib_network *network)
1571 {
1572         int rc = 0;
1573         struct rtllib_qos_information_element qos_info_element;
1574
1575         rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1576
1577         if (rc == 0) {
1578                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1579                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1580         } else {
1581                 struct rtllib_qos_parameter_info param_element;
1582
1583                 rc = rtllib_read_qos_param_element(&param_element,
1584                                                       info_element);
1585                 if (rc == 0) {
1586                         rtllib_qos_convert_ac_to_parameters(&param_element,
1587                                                                &(network->qos_data));
1588                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1589                         network->qos_data.param_count =
1590                             param_element.info_element.ac_info & 0x0F;
1591                 }
1592         }
1593
1594         if (rc == 0) {
1595                 netdev_dbg(ieee->dev, "QoS is supported\n");
1596                 network->qos_data.supported = 1;
1597         }
1598         return rc;
1599 }
1600
1601 static const char *get_info_element_string(u16 id)
1602 {
1603         switch (id) {
1604         case MFIE_TYPE_SSID:
1605                 return "SSID";
1606         case MFIE_TYPE_RATES:
1607                 return "RATES";
1608         case MFIE_TYPE_FH_SET:
1609                 return "FH_SET";
1610         case MFIE_TYPE_DS_SET:
1611                 return "DS_SET";
1612         case MFIE_TYPE_CF_SET:
1613                 return "CF_SET";
1614         case MFIE_TYPE_TIM:
1615                 return "TIM";
1616         case MFIE_TYPE_IBSS_SET:
1617                 return "IBSS_SET";
1618         case MFIE_TYPE_COUNTRY:
1619                 return "COUNTRY";
1620         case MFIE_TYPE_HOP_PARAMS:
1621                 return "HOP_PARAMS";
1622         case MFIE_TYPE_HOP_TABLE:
1623                 return "HOP_TABLE";
1624         case MFIE_TYPE_REQUEST:
1625                 return "REQUEST";
1626         case MFIE_TYPE_CHALLENGE:
1627                 return "CHALLENGE";
1628         case MFIE_TYPE_POWER_CONSTRAINT:
1629                 return "POWER_CONSTRAINT";
1630         case MFIE_TYPE_POWER_CAPABILITY:
1631                 return "POWER_CAPABILITY";
1632         case MFIE_TYPE_TPC_REQUEST:
1633                 return "TPC_REQUEST";
1634         case MFIE_TYPE_TPC_REPORT:
1635                 return "TPC_REPORT";
1636         case MFIE_TYPE_SUPP_CHANNELS:
1637                 return "SUPP_CHANNELS";
1638         case MFIE_TYPE_CSA:
1639                 return "CSA";
1640         case MFIE_TYPE_MEASURE_REQUEST:
1641                 return "MEASURE_REQUEST";
1642         case MFIE_TYPE_MEASURE_REPORT:
1643                 return "MEASURE_REPORT";
1644         case MFIE_TYPE_QUIET:
1645                 return "QUIET";
1646         case MFIE_TYPE_IBSS_DFS:
1647                 return "IBSS_DFS";
1648         case MFIE_TYPE_RSN:
1649                 return "RSN";
1650         case MFIE_TYPE_RATES_EX:
1651                 return "RATES_EX";
1652         case MFIE_TYPE_GENERIC:
1653                 return "GENERIC";
1654         case MFIE_TYPE_QOS_PARAMETER:
1655                 return "QOS_PARAMETER";
1656         default:
1657                 return "UNKNOWN";
1658         }
1659 }
1660
1661 static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
1662                                       struct rtllib_info_element *info_element,
1663                                       struct rtllib_network *network,
1664                                       u16 *tmp_htcap_len,
1665                                       u16 *tmp_htinfo_len)
1666 {
1667         u16 ht_realtek_agg_len = 0;
1668         u8  ht_realtek_agg_buf[MAX_IE_LEN];
1669
1670         if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
1671                 return;
1672         if (info_element->len >= 4 &&
1673             info_element->data[0] == 0x00 &&
1674             info_element->data[1] == 0x50 &&
1675             info_element->data[2] == 0xf2 &&
1676             info_element->data[3] == 0x01) {
1677                 network->wpa_ie_len = min(info_element->len + 2,
1678                                           MAX_WPA_IE_LEN);
1679                 memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
1680                 return;
1681         }
1682         if (info_element->len == 7 &&
1683             info_element->data[0] == 0x00 &&
1684             info_element->data[1] == 0xe0 &&
1685             info_element->data[2] == 0x4c &&
1686             info_element->data[3] == 0x01 &&
1687             info_element->data[4] == 0x02)
1688                 network->turbo_enable = 1;
1689
1690         if (*tmp_htcap_len == 0) {
1691                 if (info_element->len >= 4 &&
1692                     info_element->data[0] == 0x00 &&
1693                     info_element->data[1] == 0x90 &&
1694                     info_element->data[2] == 0x4c &&
1695                     info_element->data[3] == 0x033) {
1696                         *tmp_htcap_len = min_t(u8, info_element->len,
1697                                                MAX_IE_LEN);
1698                         if (*tmp_htcap_len != 0) {
1699                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1700                                 network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1701                                                                   sizeof(network->bssht.bd_ht_cap_buf));
1702                                 memcpy(network->bssht.bd_ht_cap_buf,
1703                                        info_element->data,
1704                                        network->bssht.bd_ht_cap_len);
1705                         }
1706                 }
1707                 if (*tmp_htcap_len != 0) {
1708                         network->bssht.bd_support_ht = true;
1709                         network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
1710                 } else {
1711                         network->bssht.bd_support_ht = false;
1712                         network->bssht.bd_ht_1r = false;
1713                 }
1714         }
1715
1716         if (*tmp_htinfo_len == 0) {
1717                 if (info_element->len >= 4 &&
1718                     info_element->data[0] == 0x00 &&
1719                     info_element->data[1] == 0x90 &&
1720                     info_element->data[2] == 0x4c &&
1721                     info_element->data[3] == 0x034) {
1722                         *tmp_htinfo_len = min_t(u8, info_element->len,
1723                                                 MAX_IE_LEN);
1724                         if (*tmp_htinfo_len != 0) {
1725                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1726                                 network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
1727                                                                       sizeof(network->bssht.bd_ht_info_buf));
1728                                 memcpy(network->bssht.bd_ht_info_buf,
1729                                        info_element->data,
1730                                        network->bssht.bd_ht_info_len);
1731                         }
1732                 }
1733         }
1734
1735         if (network->bssht.bd_support_ht) {
1736                 if (info_element->len >= 4 &&
1737                     info_element->data[0] == 0x00 &&
1738                     info_element->data[1] == 0xe0 &&
1739                     info_element->data[2] == 0x4c &&
1740                     info_element->data[3] == 0x02) {
1741                         ht_realtek_agg_len = min_t(u8, info_element->len,
1742                                                    MAX_IE_LEN);
1743                         memcpy(ht_realtek_agg_buf, info_element->data,
1744                                info_element->len);
1745                 }
1746                 if (ht_realtek_agg_len >= 5) {
1747                         network->realtek_cap_exit = true;
1748                         network->bssht.bd_rt2rt_aggregation = true;
1749
1750                         if ((ht_realtek_agg_buf[4] == 1) &&
1751                             (ht_realtek_agg_buf[5] & 0x02))
1752                                 network->bssht.bd_rt2rt_long_slot_time = true;
1753
1754                         if ((ht_realtek_agg_buf[4] == 1) &&
1755                             (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1756                                 network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
1757                 }
1758         }
1759         if (ht_realtek_agg_len >= 5) {
1760                 if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1761                         network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
1762         }
1763
1764         if ((info_element->len >= 3 &&
1765              info_element->data[0] == 0x00 &&
1766              info_element->data[1] == 0x05 &&
1767              info_element->data[2] == 0xb5) ||
1768              (info_element->len >= 3 &&
1769              info_element->data[0] == 0x00 &&
1770              info_element->data[1] == 0x0a &&
1771              info_element->data[2] == 0xf7) ||
1772              (info_element->len >= 3 &&
1773              info_element->data[0] == 0x00 &&
1774              info_element->data[1] == 0x10 &&
1775              info_element->data[2] == 0x18)) {
1776                 network->broadcom_cap_exist = true;
1777         }
1778         if (info_element->len >= 3 &&
1779             info_element->data[0] == 0x00 &&
1780             info_element->data[1] == 0x0c &&
1781             info_element->data[2] == 0x43)
1782                 network->ralink_cap_exist = true;
1783         if ((info_element->len >= 3 &&
1784              info_element->data[0] == 0x00 &&
1785              info_element->data[1] == 0x03 &&
1786              info_element->data[2] == 0x7f) ||
1787              (info_element->len >= 3 &&
1788              info_element->data[0] == 0x00 &&
1789              info_element->data[1] == 0x13 &&
1790              info_element->data[2] == 0x74))
1791                 network->atheros_cap_exist = true;
1792
1793         if ((info_element->len >= 3 &&
1794              info_element->data[0] == 0x00 &&
1795              info_element->data[1] == 0x50 &&
1796              info_element->data[2] == 0x43))
1797                 network->marvell_cap_exist = true;
1798         if (info_element->len >= 3 &&
1799             info_element->data[0] == 0x00 &&
1800             info_element->data[1] == 0x40 &&
1801             info_element->data[2] == 0x96)
1802                 network->cisco_cap_exist = true;
1803
1804         if (info_element->len >= 3 &&
1805             info_element->data[0] == 0x00 &&
1806             info_element->data[1] == 0x0a &&
1807             info_element->data[2] == 0xf5)
1808                 network->airgo_cap_exist = true;
1809
1810         if (info_element->len > 4 &&
1811             info_element->data[0] == 0x00 &&
1812             info_element->data[1] == 0x40 &&
1813             info_element->data[2] == 0x96 &&
1814             info_element->data[3] == 0x01) {
1815                 if (info_element->len == 6) {
1816                         memcpy(network->CcxRmState, &info_element->data[4], 2);
1817                         if (network->CcxRmState[0] != 0)
1818                                 network->ccx_rm_enable = true;
1819                         else
1820                                 network->ccx_rm_enable = false;
1821                         network->MBssidMask = network->CcxRmState[1] & 0x07;
1822                         if (network->MBssidMask != 0) {
1823                                 network->bMBssidValid = true;
1824                                 network->MBssidMask = 0xff <<
1825                                                       (network->MBssidMask);
1826                                 ether_addr_copy(network->MBssid,
1827                                                 network->bssid);
1828                                 network->MBssid[5] &= network->MBssidMask;
1829                         } else {
1830                                 network->bMBssidValid = false;
1831                         }
1832                 } else {
1833                         network->ccx_rm_enable = false;
1834                 }
1835         }
1836         if (info_element->len > 4  &&
1837             info_element->data[0] == 0x00 &&
1838             info_element->data[1] == 0x40 &&
1839             info_element->data[2] == 0x96 &&
1840             info_element->data[3] == 0x03) {
1841                 if (info_element->len == 5) {
1842                         network->bWithCcxVerNum = true;
1843                         network->bss_ccx_ver_number = info_element->data[4];
1844                 } else {
1845                         network->bWithCcxVerNum = false;
1846                         network->bss_ccx_ver_number = 0;
1847                 }
1848         }
1849         if (info_element->len > 4  &&
1850             info_element->data[0] == 0x00 &&
1851             info_element->data[1] == 0x50 &&
1852             info_element->data[2] == 0xf2 &&
1853             info_element->data[3] == 0x04) {
1854                 netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
1855                            info_element->len);
1856                 network->wzc_ie_len = min(info_element->len + 2, MAX_WZC_IE_LEN);
1857                 memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
1858         }
1859 }
1860
1861 static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
1862                                      struct rtllib_network *network,
1863                                      u16 *tmp_htcap_len)
1864 {
1865         struct bss_ht *ht = &network->bssht;
1866
1867         *tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
1868         if (*tmp_htcap_len != 0) {
1869                 ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
1870                 ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1871                                        sizeof(ht->bd_ht_cap_buf));
1872                 memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);
1873
1874                 ht->bd_support_ht = true;
1875                 ht->bd_ht_1r = ((((struct ht_capab_ele *)
1876                                 ht->bd_ht_cap_buf))->MCS[1]) == 0;
1877
1878                 ht->bd_bandwidth = (enum ht_channel_width)
1879                                              (((struct ht_capab_ele *)
1880                                              (ht->bd_ht_cap_buf))->ChlWidth);
1881         } else {
1882                 ht->bd_support_ht = false;
1883                 ht->bd_ht_1r = false;
1884                 ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
1885         }
1886 }
1887
1888 int rtllib_parse_info_param(struct rtllib_device *ieee,
1889                 struct rtllib_info_element *info_element,
1890                 u16 length,
1891                 struct rtllib_network *network,
1892                 struct rtllib_rx_stats *stats)
1893 {
1894         u8 i;
1895         short offset;
1896         u16     tmp_htcap_len = 0;
1897         u16     tmp_htinfo_len = 0;
1898         char rates_str[64];
1899         char *p;
1900
1901         while (length >= sizeof(*info_element)) {
1902                 if (sizeof(*info_element) + info_element->len > length) {
1903                         netdev_dbg(ieee->dev,
1904                                    "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
1905                                    info_element->len + sizeof(*info_element),
1906                                    length, info_element->id);
1907                         /* We stop processing but don't return an error here
1908                          * because some misbehaviour APs break this rule. ie.
1909                          * Orinoco AP1000.
1910                          */
1911                         break;
1912                 }
1913
1914                 switch (info_element->id) {
1915                 case MFIE_TYPE_SSID:
1916                         if (rtllib_is_empty_essid(info_element->data,
1917                                                      info_element->len)) {
1918                                 network->flags |= NETWORK_EMPTY_ESSID;
1919                                 break;
1920                         }
1921
1922                         network->ssid_len = min(info_element->len,
1923                                                 (u8)IW_ESSID_MAX_SIZE);
1924                         memcpy(network->ssid, info_element->data,
1925                                network->ssid_len);
1926                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
1927                                 memset(network->ssid + network->ssid_len, 0,
1928                                        IW_ESSID_MAX_SIZE - network->ssid_len);
1929
1930                         netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
1931                                    network->ssid, network->ssid_len);
1932                         break;
1933
1934                 case MFIE_TYPE_RATES:
1935                         p = rates_str;
1936                         network->rates_len = min(info_element->len,
1937                                                  MAX_RATES_LENGTH);
1938                         for (i = 0; i < network->rates_len; i++) {
1939                                 network->rates[i] = info_element->data[i];
1940                                 p += scnprintf(p, sizeof(rates_str) -
1941                                               (p - rates_str), "%02X ",
1942                                               network->rates[i]);
1943                                 if (rtllib_is_ofdm_rate
1944                                     (info_element->data[i])) {
1945                                         network->flags |= NETWORK_HAS_OFDM;
1946                                         if (info_element->data[i] &
1947                                             RTLLIB_BASIC_RATE_MASK)
1948                                                 network->flags &=
1949                                                     ~NETWORK_HAS_CCK;
1950                                 }
1951
1952                                 if (rtllib_is_cck_rate
1953                                     (info_element->data[i])) {
1954                                         network->flags |= NETWORK_HAS_CCK;
1955                                 }
1956                         }
1957
1958                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
1959                                    rates_str, network->rates_len);
1960                         break;
1961
1962                 case MFIE_TYPE_RATES_EX:
1963                         p = rates_str;
1964                         network->rates_ex_len = min(info_element->len,
1965                                                     MAX_RATES_EX_LENGTH);
1966                         for (i = 0; i < network->rates_ex_len; i++) {
1967                                 network->rates_ex[i] = info_element->data[i];
1968                                 p += scnprintf(p, sizeof(rates_str) -
1969                                               (p - rates_str), "%02X ",
1970                                               network->rates_ex[i]);
1971                                 if (rtllib_is_ofdm_rate
1972                                     (info_element->data[i])) {
1973                                         network->flags |= NETWORK_HAS_OFDM;
1974                                         if (info_element->data[i] &
1975                                             RTLLIB_BASIC_RATE_MASK)
1976                                                 network->flags &=
1977                                                     ~NETWORK_HAS_CCK;
1978                                 }
1979                         }
1980
1981                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1982                                    rates_str, network->rates_ex_len);
1983                         break;
1984
1985                 case MFIE_TYPE_DS_SET:
1986                         netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
1987                                    info_element->data[0]);
1988                         network->channel = info_element->data[0];
1989                         break;
1990
1991                 case MFIE_TYPE_FH_SET:
1992                         netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
1993                         break;
1994
1995                 case MFIE_TYPE_CF_SET:
1996                         netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
1997                         break;
1998
1999                 case MFIE_TYPE_TIM:
2000                         if (info_element->len < 4)
2001                                 break;
2002
2003                         network->tim.tim_count = info_element->data[0];
2004                         network->tim.tim_period = info_element->data[1];
2005
2006                         network->dtim_period = info_element->data[1];
2007                         if (ieee->link_state != MAC80211_LINKED)
2008                                 break;
2009                         network->last_dtim_sta_time = jiffies;
2010
2011                         network->dtim_data = RTLLIB_DTIM_VALID;
2012
2013                         if (info_element->data[2] & 1)
2014                                 network->dtim_data |= RTLLIB_DTIM_MBCAST;
2015
2016                         offset = (info_element->data[2] >> 1) * 2;
2017
2018                         if (ieee->assoc_id < 8 * offset ||
2019                             ieee->assoc_id > 8 * (offset + info_element->len - 3))
2020                                 break;
2021
2022                         offset = (ieee->assoc_id / 8) - offset;
2023                         if (info_element->data[3 + offset] &
2024                            (1 << (ieee->assoc_id % 8)))
2025                                 network->dtim_data |= RTLLIB_DTIM_UCAST;
2026
2027                         network->listen_interval = network->dtim_period;
2028                         break;
2029
2030                 case MFIE_TYPE_ERP:
2031                         network->erp_value = info_element->data[0];
2032                         network->flags |= NETWORK_HAS_ERP_VALUE;
2033                         netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
2034                                    network->erp_value);
2035                         break;
2036                 case MFIE_TYPE_IBSS_SET:
2037                         network->atim_window = info_element->data[0];
2038                         netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
2039                                    network->atim_window);
2040                         break;
2041
2042                 case MFIE_TYPE_CHALLENGE:
2043                         netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
2044                         break;
2045
2046                 case MFIE_TYPE_GENERIC:
2047                         netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
2048                                    info_element->len);
2049
2050                         rtllib_parse_mife_generic(ieee, info_element, network,
2051                                                   &tmp_htcap_len,
2052                                                   &tmp_htinfo_len);
2053                         break;
2054
2055                 case MFIE_TYPE_RSN:
2056                         netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
2057                                    info_element->len);
2058                         network->rsn_ie_len = min(info_element->len + 2,
2059                                                   MAX_WPA_IE_LEN);
2060                         memcpy(network->rsn_ie, info_element,
2061                                network->rsn_ie_len);
2062                         break;
2063
2064                 case MFIE_TYPE_HT_CAP:
2065                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
2066                                    info_element->len);
2067
2068                         rtllib_parse_mfie_ht_cap(info_element, network,
2069                                                  &tmp_htcap_len);
2070                         break;
2071
2072                 case MFIE_TYPE_HT_INFO:
2073                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
2074                                    info_element->len);
2075                         tmp_htinfo_len = min_t(u8, info_element->len,
2076                                                MAX_IE_LEN);
2077                         if (tmp_htinfo_len) {
2078                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
2079                                 network->bssht.bd_ht_info_len = tmp_htinfo_len >
2080                                         sizeof(network->bssht.bd_ht_info_buf) ?
2081                                         sizeof(network->bssht.bd_ht_info_buf) :
2082                                         tmp_htinfo_len;
2083                                 memcpy(network->bssht.bd_ht_info_buf,
2084                                        info_element->data,
2085                                        network->bssht.bd_ht_info_len);
2086                         }
2087                         break;
2088
2089                 case MFIE_TYPE_AIRONET:
2090                         netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
2091                                    info_element->len);
2092                         if (info_element->len > IE_CISCO_FLAG_POSITION) {
2093                                 network->bWithAironetIE = true;
2094
2095                                 if ((info_element->data[IE_CISCO_FLAG_POSITION]
2096                                      & SUPPORT_CKIP_MIC) ||
2097                                      (info_element->data[IE_CISCO_FLAG_POSITION]
2098                                      & SUPPORT_CKIP_PK))
2099                                         network->ckip_supported = true;
2100                                 else
2101                                         network->ckip_supported = false;
2102                         } else {
2103                                 network->bWithAironetIE = false;
2104                                 network->ckip_supported = false;
2105                         }
2106                         break;
2107                 case MFIE_TYPE_QOS_PARAMETER:
2108                         netdev_err(ieee->dev,
2109                                    "QoS Error need to parse QOS_PARAMETER IE\n");
2110                         break;
2111
2112                 case MFIE_TYPE_COUNTRY:
2113                         netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
2114                                    info_element->len);
2115                         break;
2116 /* TODO */
2117                 default:
2118                         netdev_dbg(ieee->dev,
2119                                    "Unsupported info element: %s (%d)\n",
2120                                    get_info_element_string(info_element->id),
2121                                    info_element->id);
2122                         break;
2123                 }
2124
2125                 length -= sizeof(*info_element) + info_element->len;
2126                 info_element =
2127                     (struct rtllib_info_element *)&info_element->data[info_element->len];
2128         }
2129
2130         if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2131             !network->cisco_cap_exist && !network->ralink_cap_exist &&
2132             !network->bssht.bd_rt2rt_aggregation)
2133                 network->unknown_cap_exist = true;
2134         else
2135                 network->unknown_cap_exist = false;
2136         return 0;
2137 }
2138
2139 static long rtllib_translate_todbm(u8 signal_strength_index)
2140 {
2141         long    signal_power;
2142
2143         signal_power = (long)((signal_strength_index + 1) >> 1);
2144         signal_power -= 95;
2145
2146         return signal_power;
2147 }
2148
2149 static inline int rtllib_network_init(
2150         struct rtllib_device *ieee,
2151         struct rtllib_probe_response *beacon,
2152         struct rtllib_network *network,
2153         struct rtllib_rx_stats *stats)
2154 {
2155         memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2156
2157         /* Pull out fixed field data */
2158         ether_addr_copy(network->bssid, beacon->header.addr3);
2159         network->capability = le16_to_cpu(beacon->capability);
2160         network->last_scanned = jiffies;
2161         network->time_stamp[0] = beacon->time_stamp[0];
2162         network->time_stamp[1] = beacon->time_stamp[1];
2163         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
2164         /* Where to pull this? beacon->listen_interval;*/
2165         network->listen_interval = 0x0A;
2166         network->rates_len = network->rates_ex_len = 0;
2167         network->ssid_len = 0;
2168         network->hidden_ssid_len = 0;
2169         memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2170         network->flags = 0;
2171         network->atim_window = 0;
2172         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2173             0x3 : 0x0;
2174         network->berp_info_valid = false;
2175         network->broadcom_cap_exist = false;
2176         network->ralink_cap_exist = false;
2177         network->atheros_cap_exist = false;
2178         network->cisco_cap_exist = false;
2179         network->unknown_cap_exist = false;
2180         network->realtek_cap_exit = false;
2181         network->marvell_cap_exist = false;
2182         network->airgo_cap_exist = false;
2183         network->turbo_enable = 0;
2184         network->SignalStrength = stats->SignalStrength;
2185         network->RSSI = stats->SignalStrength;
2186         network->CountryIeLen = 0;
2187         memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2188         ht_initialize_bss_desc(&network->bssht);
2189         network->flags |= NETWORK_HAS_CCK;
2190
2191         network->wpa_ie_len = 0;
2192         network->rsn_ie_len = 0;
2193         network->wzc_ie_len = 0;
2194
2195         if (rtllib_parse_info_param(ieee,
2196                         beacon->info_element,
2197                         (stats->len - sizeof(*beacon)),
2198                         network,
2199                         stats))
2200                 return 1;
2201
2202         network->mode = 0;
2203
2204         if (network->flags & NETWORK_HAS_OFDM)
2205                 network->mode |= WIRELESS_MODE_G;
2206         if (network->flags & NETWORK_HAS_CCK)
2207                 network->mode |= WIRELESS_MODE_B;
2208
2209         if (network->mode == 0) {
2210                 netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
2211                            escape_essid(network->ssid, network->ssid_len),
2212                            network->bssid);
2213                 return 1;
2214         }
2215
2216         if (network->bssht.bd_support_ht) {
2217                 if (network->mode & (WIRELESS_MODE_G | WIRELESS_MODE_B))
2218                         network->mode = WIRELESS_MODE_N_24G;
2219         }
2220         if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2221                 network->flags |= NETWORK_EMPTY_ESSID;
2222         stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2223         stats->noise = rtllib_translate_todbm((u8)(100 - stats->signal)) - 25;
2224
2225         memcpy(&network->stats, stats, sizeof(network->stats));
2226
2227         return 0;
2228 }
2229
2230 static inline int is_same_network(struct rtllib_network *src,
2231                                   struct rtllib_network *dst, u8 ssidbroad)
2232 {
2233         /* A network is only a duplicate if the channel, BSSID, ESSID
2234          * and the capability field (in particular IBSS and BSS) all match.
2235          * We treat all <hidden> with the same BSSID and channel
2236          * as one network
2237          */
2238         return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2239                 (src->channel == dst->channel) &&
2240                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2241                 (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2242                 (!ssidbroad)) &&
2243                 ((src->capability & WLAN_CAPABILITY_IBSS) ==
2244                 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2245                 ((src->capability & WLAN_CAPABILITY_ESS) ==
2246                 (dst->capability & WLAN_CAPABILITY_ESS)));
2247 }
2248
2249 static inline void update_network(struct rtllib_device *ieee,
2250                                   struct rtllib_network *dst,
2251                                   struct rtllib_network *src)
2252 {
2253         int qos_active;
2254         u8 old_param;
2255
2256         memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2257         dst->capability = src->capability;
2258         memcpy(dst->rates, src->rates, src->rates_len);
2259         dst->rates_len = src->rates_len;
2260         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2261         dst->rates_ex_len = src->rates_ex_len;
2262         if (src->ssid_len > 0) {
2263                 if (dst->ssid_len == 0) {
2264                         memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2265                         dst->hidden_ssid_len = src->ssid_len;
2266                         memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2267                 } else {
2268                         memset(dst->ssid, 0, dst->ssid_len);
2269                         dst->ssid_len = src->ssid_len;
2270                         memcpy(dst->ssid, src->ssid, src->ssid_len);
2271                 }
2272         }
2273         dst->mode = src->mode;
2274         dst->flags = src->flags;
2275         dst->time_stamp[0] = src->time_stamp[0];
2276         dst->time_stamp[1] = src->time_stamp[1];
2277         if (src->flags & NETWORK_HAS_ERP_VALUE) {
2278                 dst->erp_value = src->erp_value;
2279                 dst->berp_info_valid = src->berp_info_valid = true;
2280         }
2281         dst->beacon_interval = src->beacon_interval;
2282         dst->listen_interval = src->listen_interval;
2283         dst->atim_window = src->atim_window;
2284         dst->dtim_period = src->dtim_period;
2285         dst->dtim_data = src->dtim_data;
2286         dst->last_dtim_sta_time = src->last_dtim_sta_time;
2287         memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2288
2289         dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
2290         dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
2291         dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
2292         memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
2293                src->bssht.bd_ht_cap_len);
2294         dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
2295         memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
2296                src->bssht.bd_ht_info_len);
2297         dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
2298         dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
2299         dst->broadcom_cap_exist = src->broadcom_cap_exist;
2300         dst->ralink_cap_exist = src->ralink_cap_exist;
2301         dst->atheros_cap_exist = src->atheros_cap_exist;
2302         dst->realtek_cap_exit = src->realtek_cap_exit;
2303         dst->marvell_cap_exist = src->marvell_cap_exist;
2304         dst->cisco_cap_exist = src->cisco_cap_exist;
2305         dst->airgo_cap_exist = src->airgo_cap_exist;
2306         dst->unknown_cap_exist = src->unknown_cap_exist;
2307         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2308         dst->wpa_ie_len = src->wpa_ie_len;
2309         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2310         dst->rsn_ie_len = src->rsn_ie_len;
2311         memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2312         dst->wzc_ie_len = src->wzc_ie_len;
2313
2314         dst->last_scanned = jiffies;
2315         /* qos related parameters */
2316         qos_active = dst->qos_data.active;
2317         old_param = dst->qos_data.param_count;
2318         dst->qos_data.supported = src->qos_data.supported;
2319         if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2320                 memcpy(&dst->qos_data, &src->qos_data,
2321                        sizeof(struct rtllib_qos_data));
2322         if (dst->qos_data.supported == 1) {
2323                 if (dst->ssid_len)
2324                         netdev_dbg(ieee->dev,
2325                                    "QoS the network %s is QoS supported\n",
2326                                    dst->ssid);
2327                 else
2328                         netdev_dbg(ieee->dev,
2329                                    "QoS the network is QoS supported\n");
2330         }
2331         dst->qos_data.active = qos_active;
2332         dst->qos_data.old_param_count = old_param;
2333
2334         dst->wmm_info = src->wmm_info;
2335         if (src->wmm_param[0].ac_aci_acm_aifsn ||
2336            src->wmm_param[1].ac_aci_acm_aifsn ||
2337            src->wmm_param[2].ac_aci_acm_aifsn ||
2338            src->wmm_param[3].ac_aci_acm_aifsn)
2339                 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2340
2341         dst->SignalStrength = src->SignalStrength;
2342         dst->RSSI = src->RSSI;
2343         dst->turbo_enable = src->turbo_enable;
2344
2345         dst->CountryIeLen = src->CountryIeLen;
2346         memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2347
2348         dst->bWithAironetIE = src->bWithAironetIE;
2349         dst->ckip_supported = src->ckip_supported;
2350         memcpy(dst->CcxRmState, src->CcxRmState, 2);
2351         dst->ccx_rm_enable = src->ccx_rm_enable;
2352         dst->MBssidMask = src->MBssidMask;
2353         dst->bMBssidValid = src->bMBssidValid;
2354         memcpy(dst->MBssid, src->MBssid, 6);
2355         dst->bWithCcxVerNum = src->bWithCcxVerNum;
2356         dst->bss_ccx_ver_number = src->bss_ccx_ver_number;
2357 }
2358
2359 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2360 {
2361         if (channel > MAX_CHANNEL_NUMBER) {
2362                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2363                 return 0;
2364         }
2365
2366         if (rtllib->active_channel_map[channel] == 2)
2367                 return 1;
2368
2369         return 0;
2370 }
2371
2372 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2373 {
2374         if (channel > MAX_CHANNEL_NUMBER) {
2375                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2376                 return 0;
2377         }
2378         if (rtllib->active_channel_map[channel] > 0)
2379                 return 1;
2380
2381         return 0;
2382 }
2383 EXPORT_SYMBOL(rtllib_legal_channel);
2384
2385 static inline void rtllib_process_probe_response(
2386         struct rtllib_device *ieee,
2387         struct rtllib_probe_response *beacon,
2388         struct rtllib_rx_stats *stats)
2389 {
2390         struct rtllib_network *target;
2391         struct rtllib_network *oldest = NULL;
2392         struct rtllib_info_element *info_element = &beacon->info_element[0];
2393         unsigned long flags;
2394         short renew;
2395         struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2396                                                  GFP_ATOMIC);
2397         __le16 frame_ctl = beacon->header.frame_control;
2398
2399         if (!network)
2400                 return;
2401
2402         netdev_dbg(ieee->dev,
2403                    "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2404                    escape_essid(info_element->data, info_element->len),
2405                    beacon->header.addr3,
2406                    (le16_to_cpu(beacon->capability) & (1 << 0xf)) ? '1' : '0',
2407                    (le16_to_cpu(beacon->capability) & (1 << 0xe)) ? '1' : '0',
2408                    (le16_to_cpu(beacon->capability) & (1 << 0xd)) ? '1' : '0',
2409                    (le16_to_cpu(beacon->capability) & (1 << 0xc)) ? '1' : '0',
2410                    (le16_to_cpu(beacon->capability) & (1 << 0xb)) ? '1' : '0',
2411                    (le16_to_cpu(beacon->capability) & (1 << 0xa)) ? '1' : '0',
2412                    (le16_to_cpu(beacon->capability) & (1 << 0x9)) ? '1' : '0',
2413                    (le16_to_cpu(beacon->capability) & (1 << 0x8)) ? '1' : '0',
2414                    (le16_to_cpu(beacon->capability) & (1 << 0x7)) ? '1' : '0',
2415                    (le16_to_cpu(beacon->capability) & (1 << 0x6)) ? '1' : '0',
2416                    (le16_to_cpu(beacon->capability) & (1 << 0x5)) ? '1' : '0',
2417                    (le16_to_cpu(beacon->capability) & (1 << 0x4)) ? '1' : '0',
2418                    (le16_to_cpu(beacon->capability) & (1 << 0x3)) ? '1' : '0',
2419                    (le16_to_cpu(beacon->capability) & (1 << 0x2)) ? '1' : '0',
2420                    (le16_to_cpu(beacon->capability) & (1 << 0x1)) ? '1' : '0',
2421                    (le16_to_cpu(beacon->capability) & (1 << 0x0)) ? '1' : '0');
2422
2423         if (rtllib_network_init(ieee, beacon, network, stats)) {
2424                 netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
2425                            escape_essid(info_element->data, info_element->len),
2426                            beacon->header.addr3,
2427                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2428                 goto free_network;
2429         }
2430
2431         if (!rtllib_legal_channel(ieee, network->channel))
2432                 goto free_network;
2433
2434         if (ieee80211_is_probe_resp(frame_ctl)) {
2435                 if (IsPassiveChannel(ieee, network->channel)) {
2436                         netdev_info(ieee->dev,
2437                                     "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
2438                                     network->channel);
2439                         goto free_network;
2440                 }
2441         }
2442
2443         /* The network parsed correctly -- so now we scan our known networks
2444          * to see if we can find it in our list.
2445          *
2446          * NOTE:  This search is definitely not optimized.  Once its doing
2447          *      the "right thing" we'll optimize it for efficiency if
2448          *      necessary
2449          */
2450
2451         /* Search for this entry in the list and update it if it is
2452          * already there.
2453          */
2454
2455         spin_lock_irqsave(&ieee->lock, flags);
2456         if (is_same_network(&ieee->current_network, network,
2457            (network->ssid_len ? 1 : 0))) {
2458                 update_network(ieee, &ieee->current_network, network);
2459                 if ((ieee->current_network.mode == WIRELESS_MODE_N_24G ||
2460                      ieee->current_network.mode == WIRELESS_MODE_G) &&
2461                     ieee->current_network.berp_info_valid) {
2462                         if (ieee->current_network.erp_value & ERP_UseProtection)
2463                                 ieee->current_network.buseprotection = true;
2464                         else
2465                                 ieee->current_network.buseprotection = false;
2466                 }
2467                 if (ieee80211_is_beacon(frame_ctl)) {
2468                         if (ieee->link_state >= MAC80211_LINKED)
2469                                 ieee->link_detect_info.num_recv_bcn_in_period++;
2470                 }
2471         }
2472         list_for_each_entry(target, &ieee->network_list, list) {
2473                 if (is_same_network(target, network,
2474                    (target->ssid_len ? 1 : 0)))
2475                         break;
2476                 if (!oldest || (target->last_scanned < oldest->last_scanned))
2477                         oldest = target;
2478         }
2479
2480         /* If we didn't find a match, then get a new network slot to initialize
2481          * with this beacon's information
2482          */
2483         if (&target->list == &ieee->network_list) {
2484                 if (list_empty(&ieee->network_free_list)) {
2485                         /* If there are no more slots, expire the oldest */
2486                         list_del(&oldest->list);
2487                         target = oldest;
2488                         netdev_dbg(ieee->dev,
2489                                    "Expired '%s' ( %pM) from network list.\n",
2490                                    escape_essid(target->ssid, target->ssid_len),
2491                                    target->bssid);
2492                 } else {
2493                         /* Otherwise just pull from the free list */
2494                         target = list_entry(ieee->network_free_list.next,
2495                                             struct rtllib_network, list);
2496                         list_del(ieee->network_free_list.next);
2497                 }
2498
2499                 netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
2500                            escape_essid(network->ssid, network->ssid_len),
2501                            network->bssid,
2502                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2503
2504                 memcpy(target, network, sizeof(*target));
2505                 list_add_tail(&target->list, &ieee->network_list);
2506                 if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2507                         rtllib_softmac_new_net(ieee, network);
2508         } else {
2509                 netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
2510                            escape_essid(target->ssid, target->ssid_len),
2511                            target->bssid,
2512                            ieee80211_is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2513
2514                 /* we have an entry and we are going to update it. But this
2515                  *  entry may be already expired. In this case we do the same
2516                  * as we found a new net and call the new_net handler
2517                  */
2518                 renew = !time_after(target->last_scanned + ieee->scan_age,
2519                                     jiffies);
2520                 if ((!target->ssid_len) &&
2521                     (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2522                     || ((ieee->current_network.ssid_len == network->ssid_len) &&
2523                     (strncmp(ieee->current_network.ssid, network->ssid,
2524                     network->ssid_len) == 0) &&
2525                     (ieee->link_state == MAC80211_NOLINK))))
2526                         renew = 1;
2527                 update_network(ieee, target, network);
2528                 if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2529                         rtllib_softmac_new_net(ieee, network);
2530         }
2531
2532         spin_unlock_irqrestore(&ieee->lock, flags);
2533         if (ieee80211_is_beacon(frame_ctl) &&
2534             is_same_network(&ieee->current_network, network,
2535             (network->ssid_len ? 1 : 0)) &&
2536             (ieee->link_state == MAC80211_LINKED)) {
2537                 ieee->handle_beacon(ieee->dev, beacon, &ieee->current_network);
2538         }
2539 free_network:
2540         kfree(network);
2541 }
2542
2543 static void rtllib_rx_mgt(struct rtllib_device *ieee,
2544                           struct sk_buff *skb,
2545                           struct rtllib_rx_stats *stats)
2546 {
2547         struct ieee80211_hdr *header = (struct ieee80211_hdr *)skb->data;
2548
2549         if (!ieee80211_is_probe_resp(header->frame_control) &&
2550             (!ieee80211_is_beacon(header->frame_control)))
2551                 ieee->last_rx_ps_time = jiffies;
2552
2553         if (ieee80211_is_beacon(header->frame_control)) {
2554                 netdev_dbg(ieee->dev, "received BEACON\n");
2555                 rtllib_process_probe_response(
2556                                 ieee, (struct rtllib_probe_response *)header,
2557                                 stats);
2558
2559                 if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2560                     ieee->iw_mode == IW_MODE_INFRA &&
2561                     ieee->link_state == MAC80211_LINKED))
2562                         schedule_work(&ieee->ps_task);
2563         } else if (ieee80211_is_probe_resp(header->frame_control)) {
2564                 netdev_dbg(ieee->dev, "received PROBE RESPONSE\n");
2565                 rtllib_process_probe_response(ieee,
2566                               (struct rtllib_probe_response *)header, stats);
2567         }
2568 }