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  * <[email protected]>
   8  * Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
   9  * Copyright (c) 2004, Intel Corporation
  10  *
  11  * Few modifications for Realtek's Wi-Fi drivers by
  12  * Andrea Merello <[email protected]>
  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 #include "dot11d.h"
  38
  39 static void rtllib_rx_mgt(struct rtllib_device *ieee, struct sk_buff *skb,
  40                           struct rtllib_rx_stats *stats);
  41
  42 static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
  43                                      struct sk_buff *skb,
  44                                      struct rtllib_rx_stats *rx_status,
  45                                      size_t hdr_length)
  46 {
  47         skb->dev = ieee->dev;
  48         skb_reset_mac_header(skb);
  49         skb_pull(skb, hdr_length);
  50         skb->pkt_type = PACKET_OTHERHOST;
  51         skb->protocol = htons(ETH_P_80211_RAW);
  52         memset(skb->cb, 0, sizeof(skb->cb));
  53         netif_rx(skb);
  54 }
  55
  56 /* Called only as a tasklet (software IRQ) */
  57 static struct rtllib_frag_entry *
  58 rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
  59                           unsigned int frag, u8 tid, u8 *src, u8 *dst)
  60 {
  61         struct rtllib_frag_entry *entry;
  62         int i;
  63
  64         for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
  65                 entry = &ieee->frag_cache[tid][i];
  66                 if (entry->skb != NULL &&
  67                     time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
  68                         netdev_dbg(ieee->dev,
  69                                    "expiring fragment cache entry seq=%u last_frag=%u\n",
  70                                    entry->seq, entry->last_frag);
  71                         dev_kfree_skb_any(entry->skb);
  72                         entry->skb = NULL;
  73                 }
  74
  75                 if (entry->skb != NULL && entry->seq == seq &&
  76                     (entry->last_frag + 1 == frag || frag == -1) &&
  77                     memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
  78                     memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
  79                         return entry;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 /* Called only as a tasklet (software IRQ) */
  86 static struct sk_buff *
  87 rtllib_frag_cache_get(struct rtllib_device *ieee,
  88                          struct rtllib_hdr_4addr *hdr)
  89 {
  90         struct sk_buff *skb = NULL;
  91         u16 fc = le16_to_cpu(hdr->frame_ctl);
  92         u16 sc = le16_to_cpu(hdr->seq_ctl);
  93         unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
  94         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
  95         struct rtllib_frag_entry *entry;
  96         struct rtllib_hdr_3addrqos *hdr_3addrqos;
  97         struct rtllib_hdr_4addrqos *hdr_4addrqos;
  98         u8 tid;
  99
 100         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 101             RTLLIB_QOS_HAS_SEQ(fc)) {
 102                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
 103                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 104                 tid = UP2AC(tid);
 105                 tid++;
 106         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 107                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
 108                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 109                 tid = UP2AC(tid);
 110                 tid++;
 111         } else {
 112                 tid = 0;
 113         }
 114
 115         if (frag == 0) {
 116                 /* Reserve enough space to fit maximum frame length */
 117                 skb = dev_alloc_skb(ieee->dev->mtu +
 118                                     sizeof(struct rtllib_hdr_4addr) +
 119                                     8 /* LLC */ +
 120                                     2 /* alignment */ +
 121                                     8 /* WEP */ +
 122                                     ETH_ALEN /* WDS */ +
 123                                     /* QOS Control */
 124                                     (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0));
 125                 if (!skb)
 126                         return NULL;
 127
 128                 entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
 129                 ieee->frag_next_idx[tid]++;
 130                 if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
 131                         ieee->frag_next_idx[tid] = 0;
 132
 133                 if (entry->skb != NULL)
 134                         dev_kfree_skb_any(entry->skb);
 135
 136                 entry->first_frag_time = jiffies;
 137                 entry->seq = seq;
 138                 entry->last_frag = frag;
 139                 entry->skb = skb;
 140                 ether_addr_copy(entry->src_addr, hdr->addr2);
 141                 ether_addr_copy(entry->dst_addr, hdr->addr1);
 142         } else {
 143                 /* received a fragment of a frame for which the head fragment
 144                  * should have already been received
 145                  */
 146                 entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
 147                                                   hdr->addr1);
 148                 if (entry != NULL) {
 149                         entry->last_frag = frag;
 150                         skb = entry->skb;
 151                 }
 152         }
 153
 154         return skb;
 155 }
 156
 157 /* Called only as a tasklet (software IRQ) */
 158 static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
 159                                            struct rtllib_hdr_4addr *hdr)
 160 {
 161         u16 fc = le16_to_cpu(hdr->frame_ctl);
 162         u16 sc = le16_to_cpu(hdr->seq_ctl);
 163         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
 164         struct rtllib_frag_entry *entry;
 165         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 166         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 167         u8 tid;
 168
 169         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 170             RTLLIB_QOS_HAS_SEQ(fc)) {
 171                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
 172                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 173                 tid = UP2AC(tid);
 174                 tid++;
 175         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 176                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
 177                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 178                 tid = UP2AC(tid);
 179                 tid++;
 180         } else {
 181                 tid = 0;
 182         }
 183
 184         entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
 185                                           hdr->addr1);
 186
 187         if (entry == NULL) {
 188                 netdev_dbg(ieee->dev,
 189                            "Couldn't invalidate fragment cache entry (seq=%u)\n",
 190                            seq);
 191                 return -1;
 192         }
 193
 194         entry->skb = NULL;
 195         return 0;
 196 }
 197
 198 /* rtllib_rx_frame_mgtmt
 199  *
 200  * Responsible for handling management control frames
 201  *
 202  * Called by rtllib_rx
 203  */
 204 static inline int
 205 rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
 206                         struct rtllib_rx_stats *rx_stats, u16 type,
 207                         u16 stype)
 208 {
 209         /* On the struct stats definition there is written that
 210          * this is not mandatory.... but seems that the probe
 211          * response parser uses it
 212          */
 213         struct rtllib_hdr_3addr *hdr = (struct rtllib_hdr_3addr *)skb->data;
 214
 215         rx_stats->len = skb->len;
 216         rtllib_rx_mgt(ieee, skb, rx_stats);
 217         if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
 218                 dev_kfree_skb_any(skb);
 219                 return 0;
 220         }
 221         rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
 222
 223         dev_kfree_skb_any(skb);
 224
 225         return 0;
 226 }
 227
 228 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation
 229  * Ethernet-II snap header (RFC1042 for most EtherTypes)
 230  */
 231 static unsigned char rfc1042_header[] = {
 232         0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
 233 };
 234
 235 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 236 static unsigned char bridge_tunnel_header[] = {
 237         0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
 238 };
 239
 240 /* No encapsulation header if EtherType < 0x600 (=length) */
 241
 242 /* Called by rtllib_rx_frame_decrypt */
 243 static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
 244                                     struct sk_buff *skb, size_t hdrlen)
 245 {
 246         struct net_device *dev = ieee->dev;
 247         u16 fc, ethertype;
 248         struct rtllib_hdr_4addr *hdr;
 249         u8 *pos;
 250
 251         if (skb->len < 24)
 252                 return 0;
 253
 254         hdr = (struct rtllib_hdr_4addr *)skb->data;
 255         fc = le16_to_cpu(hdr->frame_ctl);
 256
 257         /* check that the frame is unicast frame to us */
 258         if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 259             RTLLIB_FCTL_TODS &&
 260             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
 261             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
 262                 /* ToDS frame with own addr BSSID and DA */
 263         } else if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 264                    RTLLIB_FCTL_FROMDS &&
 265                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
 266                 /* FromDS frame with own addr as DA */
 267         } else
 268                 return 0;
 269
 270         if (skb->len < 24 + 8)
 271                 return 0;
 272
 273         /* check for port access entity Ethernet type */
 274         pos = skb->data + hdrlen;
 275         ethertype = (pos[6] << 8) | pos[7];
 276         if (ethertype == ETH_P_PAE)
 277                 return 1;
 278
 279         return 0;
 280 }
 281
 282 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 283 static inline int
 284 rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
 285                         struct lib80211_crypt_data *crypt)
 286 {
 287         struct rtllib_hdr_4addr *hdr;
 288         int res, hdrlen;
 289
 290         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 291                 return 0;
 292
 293         if (ieee->hwsec_active) {
 294                 struct cb_desc *tcb_desc = (struct cb_desc *)
 295                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 296
 297                 tcb_desc->bHwSec = 1;
 298
 299                 if (ieee->need_sw_enc)
 300                         tcb_desc->bHwSec = 0;
 301         }
 302
 303         hdr = (struct rtllib_hdr_4addr *)skb->data;
 304         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 305
 306         atomic_inc(&crypt->refcnt);
 307         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 308         atomic_dec(&crypt->refcnt);
 309         if (res < 0) {
 310                 netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
 311                            hdr->addr2, res);
 312                 if (res == -2)
 313                         netdev_dbg(ieee->dev,
 314                                    "Decryption failed ICV mismatch (key %d)\n",
 315                                    skb->data[hdrlen + 3] >> 6);
 316                 return -1;
 317         }
 318
 319         return res;
 320 }
 321
 322 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 323 static inline int
 324 rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
 325                              int keyidx, struct lib80211_crypt_data *crypt)
 326 {
 327         struct rtllib_hdr_4addr *hdr;
 328         int res, hdrlen;
 329
 330         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 331                 return 0;
 332         if (ieee->hwsec_active) {
 333                 struct cb_desc *tcb_desc = (struct cb_desc *)
 334                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 335
 336                 tcb_desc->bHwSec = 1;
 337
 338                 if (ieee->need_sw_enc)
 339                         tcb_desc->bHwSec = 0;
 340         }
 341
 342         hdr = (struct rtllib_hdr_4addr *)skb->data;
 343         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 344
 345         atomic_inc(&crypt->refcnt);
 346         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 347         atomic_dec(&crypt->refcnt);
 348         if (res < 0) {
 349                 netdev_dbg(ieee->dev,
 350                            "MSDU decryption/MIC verification failed (SA= %pM keyidx=%d)\n",
 351                            hdr->addr2, keyidx);
 352                 return -1;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /* this function is stolen from ipw2200 driver*/
 359 #define IEEE_PACKET_RETRY_TIME (5 * HZ)
 360 static int is_duplicate_packet(struct rtllib_device *ieee,
 361                                       struct rtllib_hdr_4addr *header)
 362 {
 363         u16 fc = le16_to_cpu(header->frame_ctl);
 364         u16 sc = le16_to_cpu(header->seq_ctl);
 365         u16 seq = WLAN_GET_SEQ_SEQ(sc);
 366         u16 frag = WLAN_GET_SEQ_FRAG(sc);
 367         u16 *last_seq, *last_frag;
 368         unsigned long *last_time;
 369         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 370         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 371         u8 tid;
 372
 373         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 374             RTLLIB_QOS_HAS_SEQ(fc)) {
 375                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)header;
 376                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 377                 tid = UP2AC(tid);
 378                 tid++;
 379         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 380                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)header;
 381                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 382                 tid = UP2AC(tid);
 383                 tid++;
 384         } else {
 385                 tid = 0;
 386         }
 387
 388         switch (ieee->iw_mode) {
 389         case IW_MODE_ADHOC:
 390         {
 391                 struct list_head *p;
 392                 struct ieee_ibss_seq *entry = NULL;
 393                 u8 *mac = header->addr2;
 394                 int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
 395
 396                 list_for_each(p, &ieee->ibss_mac_hash[index]) {
 397                         entry = list_entry(p, struct ieee_ibss_seq, list);
 398                         if (!memcmp(entry->mac, mac, ETH_ALEN))
 399                                 break;
 400                 }
 401                 if (p == &ieee->ibss_mac_hash[index]) {
 402                         entry = kmalloc(sizeof(struct ieee_ibss_seq),
 403                                         GFP_ATOMIC);
 404                         if (!entry)
 405                                 return 0;
 406
 407                         ether_addr_copy(entry->mac, mac);
 408                         entry->seq_num[tid] = seq;
 409                         entry->frag_num[tid] = frag;
 410                         entry->packet_time[tid] = jiffies;
 411                         list_add(&entry->list, &ieee->ibss_mac_hash[index]);
 412                         return 0;
 413                 }
 414                 last_seq = &entry->seq_num[tid];
 415                 last_frag = &entry->frag_num[tid];
 416                 last_time = &entry->packet_time[tid];
 417                 break;
 418         }
 419
 420         case IW_MODE_INFRA:
 421                 last_seq = &ieee->last_rxseq_num[tid];
 422                 last_frag = &ieee->last_rxfrag_num[tid];
 423                 last_time = &ieee->last_packet_time[tid];
 424                 break;
 425         default:
 426                 return 0;
 427         }
 428
 429         if ((*last_seq == seq) &&
 430             time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
 431                 if (*last_frag == frag)
 432                         goto drop;
 433                 if (*last_frag + 1 != frag)
 434                         /* out-of-order fragment */
 435                         goto drop;
 436         } else
 437                 *last_seq = seq;
 438
 439         *last_frag = frag;
 440         *last_time = jiffies;
 441         return 0;
 442
 443 drop:
 444
 445         return 1;
 446 }
 447
 448 static bool AddReorderEntry(struct rx_ts_record *pTS,
 449                             struct rx_reorder_entry *pReorderEntry)
 450 {
 451         struct list_head *pList = &pTS->rx_pending_pkt_list;
 452
 453         while (pList->next != &pTS->rx_pending_pkt_list) {
 454                 if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
 455                     list_entry(pList->next, struct rx_reorder_entry,
 456                     List))->SeqNum))
 457                         pList = pList->next;
 458                 else if (SN_EQUAL(pReorderEntry->SeqNum,
 459                         ((struct rx_reorder_entry *)list_entry(pList->next,
 460                         struct rx_reorder_entry, List))->SeqNum))
 461                         return false;
 462                 else
 463                         break;
 464         }
 465         pReorderEntry->List.next = pList->next;
 466         pReorderEntry->List.next->prev = &pReorderEntry->List;
 467         pReorderEntry->List.prev = pList;
 468         pList->next = &pReorderEntry->List;
 469
 470         return true;
 471 }
 472
 473 void rtllib_indicate_packets(struct rtllib_device *ieee,
 474                              struct rtllib_rxb **prxbIndicateArray, u8 index)
 475 {
 476         struct net_device_stats *stats = &ieee->stats;
 477         u8 i = 0, j = 0;
 478         u16 ethertype;
 479
 480         for (j = 0; j < index; j++) {
 481                 struct rtllib_rxb *prxb = prxbIndicateArray[j];
 482
 483                 for (i = 0; i < prxb->nr_subframes; i++) {
 484                         struct sk_buff *sub_skb = prxb->subframes[i];
 485
 486                 /* convert hdr + possible LLC headers into Ethernet header */
 487                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
 488                         if (sub_skb->len >= 8 &&
 489                             ((memcmp(sub_skb->data, rfc1042_header,
 490                                      SNAP_SIZE) == 0 &&
 491                               ethertype != ETH_P_AARP &&
 492                               ethertype != ETH_P_IPX) ||
 493                             memcmp(sub_skb->data, bridge_tunnel_header,
 494                                    SNAP_SIZE) == 0)) {
 495                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
 496                                  * and replace EtherType
 497                                  */
 498                                 skb_pull(sub_skb, SNAP_SIZE);
 499                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 500                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 501                         } else {
 502                                 u16 len;
 503                         /* Leave Ethernet header part of hdr and full payload */
 504                                 len = sub_skb->len;
 505                                 memcpy(skb_push(sub_skb, 2), &len, 2);
 506                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 507                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 508                         }
 509
 510                         /* Indicate the packets to upper layer */
 511                         if (sub_skb) {
 512                                 stats->rx_packets++;
 513                                 stats->rx_bytes += sub_skb->len;
 514
 515                                 memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
 516                                 sub_skb->protocol = eth_type_trans(sub_skb,
 517                                                                    ieee->dev);
 518                                 sub_skb->dev = ieee->dev;
 519                                 sub_skb->dev->stats.rx_packets++;
 520                                 sub_skb->dev->stats.rx_bytes += sub_skb->len;
 521                                 /* 802.11 crc not sufficient */
 522                                 sub_skb->ip_summed = CHECKSUM_NONE;
 523                                 ieee->last_rx_ps_time = jiffies;
 524                                 netif_rx(sub_skb);
 525                         }
 526                 }
 527                 kfree(prxb);
 528                 prxb = NULL;
 529         }
 530 }
 531
 532 void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee,
 533                                  struct rx_ts_record *pTS)
 534 {
 535         struct rx_reorder_entry *pRxReorderEntry;
 536         u8 RfdCnt = 0;
 537
 538         del_timer_sync(&pTS->rx_pkt_pending_timer);
 539         while (!list_empty(&pTS->rx_pending_pkt_list)) {
 540                 if (RfdCnt >= REORDER_WIN_SIZE) {
 541                         netdev_info(ieee->dev,
 542                                     "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n",
 543                                     __func__);
 544                         break;
 545                 }
 546
 547                 pRxReorderEntry = (struct rx_reorder_entry *)
 548                                   list_entry(pTS->rx_pending_pkt_list.prev,
 549                                              struct rx_reorder_entry, List);
 550                 netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n", __func__,
 551                            pRxReorderEntry->SeqNum);
 552                 list_del_init(&pRxReorderEntry->List);
 553
 554                 ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
 555
 556                 RfdCnt = RfdCnt + 1;
 557                 list_add_tail(&pRxReorderEntry->List,
 558                               &ieee->RxReorder_Unused_List);
 559         }
 560         rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
 561
 562         pTS->rx_indicate_seq = 0xffff;
 563 }
 564
 565 static void RxReorderIndicatePacket(struct rtllib_device *ieee,
 566                                     struct rtllib_rxb *prxb,
 567                                     struct rx_ts_record *pTS, u16 SeqNum)
 568 {
 569         struct rt_hi_throughput *ht_info = ieee->ht_info;
 570         struct rx_reorder_entry *pReorderEntry = NULL;
 571         u8 WinSize = ht_info->rx_reorder_win_size;
 572         u16 WinEnd = 0;
 573         u8 index = 0;
 574         bool bMatchWinStart = false, bPktInBuf = false;
 575         unsigned long flags;
 576
 577         netdev_dbg(ieee->dev,
 578                    "%s(): Seq is %d, pTS->rx_indicate_seq is %d, WinSize is %d\n",
 579                    __func__, SeqNum, pTS->rx_indicate_seq, WinSize);
 580
 581         spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
 582
 583         WinEnd = (pTS->rx_indicate_seq + WinSize - 1) % 4096;
 584         /* Rx Reorder initialize condition.*/
 585         if (pTS->rx_indicate_seq == 0xffff)
 586                 pTS->rx_indicate_seq = SeqNum;
 587
 588         /* Drop out the packet which SeqNum is smaller than WinStart */
 589         if (SN_LESS(SeqNum, pTS->rx_indicate_seq)) {
 590                 netdev_dbg(ieee->dev,
 591                            "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
 592                            pTS->rx_indicate_seq, SeqNum);
 593                 ht_info->rx_reorder_drop_counter++;
 594                 {
 595                         int i;
 596
 597                         for (i = 0; i < prxb->nr_subframes; i++)
 598                                 dev_kfree_skb(prxb->subframes[i]);
 599                         kfree(prxb);
 600                         prxb = NULL;
 601                 }
 602                 spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 603                 return;
 604         }
 605
 606         /* Sliding window manipulation. Conditions includes:
 607          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 608          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 609          */
 610         if (SN_EQUAL(SeqNum, pTS->rx_indicate_seq)) {
 611                 pTS->rx_indicate_seq = (pTS->rx_indicate_seq + 1) % 4096;
 612                 bMatchWinStart = true;
 613         } else if (SN_LESS(WinEnd, SeqNum)) {
 614                 if (SeqNum >= (WinSize - 1))
 615                         pTS->rx_indicate_seq = SeqNum + 1 - WinSize;
 616                 else
 617                         pTS->rx_indicate_seq = 4095 -
 618                                              (WinSize - (SeqNum + 1)) + 1;
 619                 netdev_dbg(ieee->dev,
 620                            "Window Shift! IndicateSeq: %d, NewSeq: %d\n",
 621                            pTS->rx_indicate_seq, SeqNum);
 622         }
 623
 624         /* Indication process.
 625          * After Packet dropping and Sliding Window shifting as above, we can
 626          * now just indicate the packets with the SeqNum smaller than latest
 627          * WinStart and struct buffer other packets.
 628          *
 629          * For Rx Reorder condition:
 630          * 1. All packets with SeqNum smaller than WinStart => Indicate
 631          * 2. All packets with SeqNum larger than or equal to
 632          *       WinStart => Buffer it.
 633          */
 634         if (bMatchWinStart) {
 635                 /* Current packet is going to be indicated.*/
 636                 netdev_dbg(ieee->dev,
 637                            "Packets indication! IndicateSeq: %d, NewSeq: %d\n",
 638                            pTS->rx_indicate_seq, SeqNum);
 639                 ieee->prxbIndicateArray[0] = prxb;
 640                 index = 1;
 641         } else {
 642                 /* Current packet is going to be inserted into pending list.*/
 643                 if (!list_empty(&ieee->RxReorder_Unused_List)) {
 644                         pReorderEntry = (struct rx_reorder_entry *)
 645                                         list_entry(ieee->RxReorder_Unused_List.next,
 646                                         struct rx_reorder_entry, List);
 647                         list_del_init(&pReorderEntry->List);
 648
 649                         /* Make a reorder entry and insert
 650                          * into a the packet list.
 651                          */
 652                         pReorderEntry->SeqNum = SeqNum;
 653                         pReorderEntry->prxb = prxb;
 654
 655                         if (!AddReorderEntry(pTS, pReorderEntry)) {
 656                                 int i;
 657
 658                                 netdev_dbg(ieee->dev,
 659                                            "%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
 660                                            __func__, pTS->rx_indicate_seq,
 661                                            SeqNum);
 662                                 list_add_tail(&pReorderEntry->List,
 663                                               &ieee->RxReorder_Unused_List);
 664
 665                                 for (i = 0; i < prxb->nr_subframes; i++)
 666                                         dev_kfree_skb(prxb->subframes[i]);
 667                                 kfree(prxb);
 668                                 prxb = NULL;
 669                         } else {
 670                                 netdev_dbg(ieee->dev,
 671                                            "Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
 672                                            pTS->rx_indicate_seq, SeqNum);
 673                         }
 674                 } else {
 675                         /* Packets are dropped if there are not enough reorder
 676                          * entries. This part should be modified!! We can just
 677                          * indicate all the packets in struct buffer and get
 678                          * reorder entries.
 679                          */
 680                         netdev_err(ieee->dev,
 681                                    "%s(): There is no reorder entry! Packet is dropped!\n",
 682                                    __func__);
 683                         {
 684                                 int i;
 685
 686                                 for (i = 0; i < prxb->nr_subframes; i++)
 687                                         dev_kfree_skb(prxb->subframes[i]);
 688                                 kfree(prxb);
 689                                 prxb = NULL;
 690                         }
 691                 }
 692         }
 693
 694         /* Check if there is any packet need indicate.*/
 695         while (!list_empty(&pTS->rx_pending_pkt_list)) {
 696                 netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
 697                            __func__);
 698
 699                 pReorderEntry = (struct rx_reorder_entry *)
 700                                         list_entry(pTS->rx_pending_pkt_list.prev,
 701                                                    struct rx_reorder_entry,
 702                                                    List);
 703                 if (SN_LESS(pReorderEntry->SeqNum, pTS->rx_indicate_seq) ||
 704                     SN_EQUAL(pReorderEntry->SeqNum, pTS->rx_indicate_seq)) {
 705                         /* This protect struct buffer from overflow. */
 706                         if (index >= REORDER_WIN_SIZE) {
 707                                 netdev_err(ieee->dev,
 708                                            "%s(): Buffer overflow!\n",
 709                                            __func__);
 710                                 bPktInBuf = true;
 711                                 break;
 712                         }
 713
 714                         list_del_init(&pReorderEntry->List);
 715
 716                         if (SN_EQUAL(pReorderEntry->SeqNum, pTS->rx_indicate_seq))
 717                                 pTS->rx_indicate_seq = (pTS->rx_indicate_seq + 1) %
 718                                                      4096;
 719
 720                         ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
 721                         netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n",
 722                                    __func__, pReorderEntry->SeqNum);
 723                         index++;
 724
 725                         list_add_tail(&pReorderEntry->List,
 726                                       &ieee->RxReorder_Unused_List);
 727                 } else {
 728                         bPktInBuf = true;
 729                         break;
 730                 }
 731         }
 732
 733         /* Handling pending timer. Set this timer to prevent from long time
 734          * Rx buffering.
 735          */
 736         if (index > 0) {
 737                 if (timer_pending(&pTS->rx_pkt_pending_timer))
 738                         del_timer_sync(&pTS->rx_pkt_pending_timer);
 739                 pTS->rx_timeout_indicate_seq = 0xffff;
 740
 741                 if (index > REORDER_WIN_SIZE) {
 742                         netdev_err(ieee->dev,
 743                                    "%s(): Rx Reorder struct buffer full!\n",
 744                                    __func__);
 745                         spin_unlock_irqrestore(&(ieee->reorder_spinlock),
 746                                                flags);
 747                         return;
 748                 }
 749                 rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
 750                 bPktInBuf = false;
 751         }
 752
 753         if (bPktInBuf && pTS->rx_timeout_indicate_seq == 0xffff) {
 754                 netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
 755                 pTS->rx_timeout_indicate_seq = pTS->rx_indicate_seq;
 756                 mod_timer(&pTS->rx_pkt_pending_timer, jiffies +
 757                           msecs_to_jiffies(ht_info->rx_reorder_pending_time));
 758         }
 759         spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 760 }
 761
 762 static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
 763                          struct rtllib_rx_stats *rx_stats,
 764                          struct rtllib_rxb *rxb, u8 *src, u8 *dst)
 765 {
 766         struct rtllib_hdr_3addr  *hdr = (struct rtllib_hdr_3addr *)skb->data;
 767         u16             fc = le16_to_cpu(hdr->frame_ctl);
 768
 769         u16             LLCOffset = sizeof(struct rtllib_hdr_3addr);
 770         u16             ChkLength;
 771         bool            bIsAggregateFrame = false;
 772         u16             nSubframe_Length;
 773         u8              nPadding_Length = 0;
 774         u16             SeqNum = 0;
 775         struct sk_buff *sub_skb;
 776         /* just for debug purpose */
 777         SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctl));
 778         if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
 779            (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
 780                 bIsAggregateFrame = true;
 781
 782         if (RTLLIB_QOS_HAS_SEQ(fc))
 783                 LLCOffset += 2;
 784         if (rx_stats->bContainHTC)
 785                 LLCOffset += sHTCLng;
 786
 787         ChkLength = LLCOffset;
 788
 789         if (skb->len <= ChkLength)
 790                 return 0;
 791
 792         skb_pull(skb, LLCOffset);
 793         ieee->bIsAggregateFrame = bIsAggregateFrame;
 794         if (!bIsAggregateFrame) {
 795                 rxb->nr_subframes = 1;
 796
 797                 /* altered by clark 3/30/2010
 798                  * The struct buffer size of the skb indicated to upper layer
 799                  * must be less than 5000, or the defraged IP datagram
 800                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 801                  * discarded. so there must not use the function
 802                  * "skb_copy" and "skb_clone" for "skb".
 803                  */
 804
 805                 /* Allocate new skb for releasing to upper layer */
 806                 sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
 807                 if (!sub_skb)
 808                         return 0;
 809                 skb_reserve(sub_skb, 12);
 810                 skb_put_data(sub_skb, skb->data, skb->len);
 811                 sub_skb->dev = ieee->dev;
 812
 813                 rxb->subframes[0] = sub_skb;
 814
 815                 memcpy(rxb->src, src, ETH_ALEN);
 816                 memcpy(rxb->dst, dst, ETH_ALEN);
 817                 rxb->subframes[0]->dev = ieee->dev;
 818                 return 1;
 819         }
 820
 821         rxb->nr_subframes = 0;
 822         memcpy(rxb->src, src, ETH_ALEN);
 823         memcpy(rxb->dst, dst, ETH_ALEN);
 824         while (skb->len > ETHERNET_HEADER_SIZE) {
 825                 /* Offset 12 denote 2 mac address */
 826                 nSubframe_Length = *((u16 *)(skb->data + 12));
 827                 nSubframe_Length = (nSubframe_Length >> 8) +
 828                                    (nSubframe_Length << 8);
 829
 830                 if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 831                         netdev_info(ieee->dev,
 832                                     "%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
 833                                     __func__, rxb->nr_subframes);
 834                         netdev_info(ieee->dev,
 835                                     "%s: A-MSDU parse error!! Subframe Length: %d\n",
 836                                     __func__, nSubframe_Length);
 837                         netdev_info(ieee->dev,
 838                                     "nRemain_Length is %d and nSubframe_Length is : %d\n",
 839                                     skb->len, nSubframe_Length);
 840                         netdev_info(ieee->dev,
 841                                     "The Packet SeqNum is %d\n",
 842                                     SeqNum);
 843                         return 0;
 844                 }
 845
 846                 /* move the data point to data content */
 847                 skb_pull(skb, ETHERNET_HEADER_SIZE);
 848
 849                 /* altered by clark 3/30/2010
 850                  * The struct buffer size of the skb indicated to upper layer
 851                  * must be less than 5000, or the defraged IP datagram
 852                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 853                  * discarded. so there must not use the function
 854                  * "skb_copy" and "skb_clone" for "skb".
 855                  */
 856
 857                 /* Allocate new skb for releasing to upper layer */
 858                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 859                 if (!sub_skb)
 860                         return 0;
 861                 skb_reserve(sub_skb, 12);
 862                 skb_put_data(sub_skb, skb->data, nSubframe_Length);
 863
 864                 sub_skb->dev = ieee->dev;
 865                 rxb->subframes[rxb->nr_subframes++] = sub_skb;
 866                 if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
 867                         netdev_dbg(ieee->dev,
 868                                    "ParseSubframe(): Too many Subframes! Packets dropped!\n");
 869                         break;
 870                 }
 871                 skb_pull(skb, nSubframe_Length);
 872
 873                 if (skb->len != 0) {
 874                         nPadding_Length = 4 - ((nSubframe_Length +
 875                                           ETHERNET_HEADER_SIZE) % 4);
 876                         if (nPadding_Length == 4)
 877                                 nPadding_Length = 0;
 878
 879                         if (skb->len < nPadding_Length)
 880                                 return 0;
 881
 882                         skb_pull(skb, nPadding_Length);
 883                 }
 884         }
 885
 886         return rxb->nr_subframes;
 887 }
 888
 889 static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
 890                                    struct sk_buff *skb,
 891                                    struct rtllib_rx_stats *rx_stats)
 892 {
 893         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 894         u16 fc = le16_to_cpu(hdr->frame_ctl);
 895         size_t hdrlen;
 896
 897         hdrlen = rtllib_get_hdrlen(fc);
 898         if (HTCCheck(ieee, skb->data)) {
 899                 if (net_ratelimit())
 900                         netdev_info(ieee->dev, "%s: find HTCControl!\n",
 901                                     __func__);
 902                 hdrlen += 4;
 903                 rx_stats->bContainHTC = true;
 904         }
 905
 906         if (RTLLIB_QOS_HAS_SEQ(fc))
 907                 rx_stats->bIsQosData = true;
 908
 909         return hdrlen;
 910 }
 911
 912 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
 913                                      struct sk_buff *skb, u8 multicast)
 914 {
 915         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 916         u16 fc, sc;
 917         u8 frag, type, stype;
 918
 919         fc = le16_to_cpu(hdr->frame_ctl);
 920         type = WLAN_FC_GET_TYPE(fc);
 921         stype = WLAN_FC_GET_STYPE(fc);
 922         sc = le16_to_cpu(hdr->seq_ctl);
 923         frag = WLAN_GET_SEQ_FRAG(sc);
 924
 925         if (!ieee->ht_info->cur_rx_reorder_enable ||
 926                 !ieee->current_network.qos_data.active ||
 927                 !IsDataFrame(skb->data) ||
 928                 IsLegacyDataFrame(skb->data)) {
 929                 if (!((type == RTLLIB_FTYPE_MGMT) &&
 930                       (stype == RTLLIB_STYPE_BEACON))) {
 931                         if (is_duplicate_packet(ieee, hdr))
 932                                 return -1;
 933                 }
 934         } else {
 935                 struct rx_ts_record *pRxTS = NULL;
 936
 937                 if (GetTs(ieee, (struct ts_common_info **)&pRxTS, hdr->addr2,
 938                         (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
 939                         if ((fc & (1 << 11)) && (frag == pRxTS->rx_last_frag_num) &&
 940                             (WLAN_GET_SEQ_SEQ(sc) == pRxTS->rx_last_seq_num))
 941                                 return -1;
 942                         pRxTS->rx_last_frag_num = frag;
 943                         pRxTS->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
 944                 } else {
 945                         netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
 946                                     __func__);
 947                         return -1;
 948                 }
 949         }
 950
 951         return 0;
 952 }
 953
 954 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
 955                                    struct rtllib_hdr_4addr *hdr, u8 *dst,
 956                                    u8 *src, u8 *bssid)
 957 {
 958         u16 fc = le16_to_cpu(hdr->frame_ctl);
 959
 960         switch (fc & (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
 961         case RTLLIB_FCTL_FROMDS:
 962                 ether_addr_copy(dst, hdr->addr1);
 963                 ether_addr_copy(src, hdr->addr3);
 964                 ether_addr_copy(bssid, hdr->addr2);
 965                 break;
 966         case RTLLIB_FCTL_TODS:
 967                 ether_addr_copy(dst, hdr->addr3);
 968                 ether_addr_copy(src, hdr->addr2);
 969                 ether_addr_copy(bssid, hdr->addr1);
 970                 break;
 971         case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
 972                 ether_addr_copy(dst, hdr->addr3);
 973                 ether_addr_copy(src, hdr->addr4);
 974                 ether_addr_copy(bssid, ieee->current_network.bssid);
 975                 break;
 976         default:
 977                 ether_addr_copy(dst, hdr->addr1);
 978                 ether_addr_copy(src, hdr->addr2);
 979                 ether_addr_copy(bssid, hdr->addr3);
 980                 break;
 981         }
 982 }
 983
 984 static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
 985                                  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
 986 {
 987         u8 type, stype;
 988
 989         type = WLAN_FC_GET_TYPE(fc);
 990         stype = WLAN_FC_GET_STYPE(fc);
 991
 992         /* Filter frames from different BSS */
 993         if (((fc & RTLLIB_FCTL_DSTODS) != RTLLIB_FCTL_DSTODS) &&
 994             !ether_addr_equal(ieee->current_network.bssid, bssid) &&
 995             !is_zero_ether_addr(ieee->current_network.bssid)) {
 996                 return -1;
 997         }
 998
 999         /* Filter packets sent by an STA that will be forwarded by AP */
1000         if (ieee->intel_promiscuous_md_info.promiscuous_on  &&
1001                 ieee->intel_promiscuous_md_info.fltr_src_sta_frame) {
1002                 if ((fc & RTLLIB_FCTL_TODS) && !(fc & RTLLIB_FCTL_FROMDS) &&
1003                     !ether_addr_equal(dst, ieee->current_network.bssid) &&
1004                     ether_addr_equal(bssid, ieee->current_network.bssid)) {
1005                         return -1;
1006                 }
1007         }
1008
1009         /* Nullfunc frames may have PS-bit set, so they must be passed to
1010          * hostap_handle_sta_rx() before being dropped here.
1011          */
1012         if (!ieee->intel_promiscuous_md_info.promiscuous_on) {
1013                 if (stype != RTLLIB_STYPE_DATA &&
1014                     stype != RTLLIB_STYPE_DATA_CFACK &&
1015                     stype != RTLLIB_STYPE_DATA_CFPOLL &&
1016                     stype != RTLLIB_STYPE_DATA_CFACKPOLL &&
1017                     stype != RTLLIB_STYPE_QOS_DATA) {
1018                         if (stype != RTLLIB_STYPE_NULLFUNC)
1019                                 netdev_dbg(ieee->dev,
1020                                            "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
1021                                            type, stype);
1022                         return -1;
1023                 }
1024         }
1025
1026         if (ieee->iw_mode != IW_MODE_MESH) {
1027                 /* packets from our adapter are dropped (echo) */
1028                 if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
1029                         return -1;
1030
1031                 /* {broad,multi}cast packets to our BSS go through */
1032                 if (is_multicast_ether_addr(dst)) {
1033                         if (memcmp(bssid, ieee->current_network.bssid,
1034                                    ETH_ALEN))
1035                                 return -1;
1036                 }
1037         }
1038         return 0;
1039 }
1040
1041 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
1042                         struct lib80211_crypt_data **crypt, size_t hdrlen)
1043 {
1044         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1045         u16 fc = le16_to_cpu(hdr->frame_ctl);
1046         int idx = 0;
1047
1048         if (ieee->host_decrypt) {
1049                 if (skb->len >= hdrlen + 3)
1050                         idx = skb->data[hdrlen + 3] >> 6;
1051
1052                 *crypt = ieee->crypt_info.crypt[idx];
1053                 /* allow NULL decrypt to indicate an station specific override
1054                  * for default encryption
1055                  */
1056                 if (*crypt && ((*crypt)->ops == NULL ||
1057                               (*crypt)->ops->decrypt_mpdu == NULL))
1058                         *crypt = NULL;
1059
1060                 if (!*crypt && (fc & RTLLIB_FCTL_WEP)) {
1061                         /* This seems to be triggered by some (multicast?)
1062                          * frames from other than current BSS, so just drop the
1063                          * frames silently instead of filling system log with
1064                          * these reports.
1065                          */
1066                         netdev_dbg(ieee->dev,
1067                                    "Decryption failed (not set) (SA= %pM)\n",
1068                                    hdr->addr2);
1069                         return -1;
1070                 }
1071         }
1072
1073         return 0;
1074 }
1075
1076 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1077                       struct rtllib_rx_stats *rx_stats,
1078                       struct lib80211_crypt_data *crypt, size_t hdrlen)
1079 {
1080         struct rtllib_hdr_4addr *hdr;
1081         int keyidx = 0;
1082         u16 fc, sc;
1083         u8 frag;
1084
1085         hdr = (struct rtllib_hdr_4addr *)skb->data;
1086         fc = le16_to_cpu(hdr->frame_ctl);
1087         sc = le16_to_cpu(hdr->seq_ctl);
1088         frag = WLAN_GET_SEQ_FRAG(sc);
1089
1090         if ((!rx_stats->Decrypted))
1091                 ieee->need_sw_enc = 1;
1092         else
1093                 ieee->need_sw_enc = 0;
1094
1095         keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1096         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) && (keyidx < 0)) {
1097                 netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
1098                 return -1;
1099         }
1100
1101         hdr = (struct rtllib_hdr_4addr *)skb->data;
1102         if ((frag != 0 || (fc & RTLLIB_FCTL_MOREFRAGS))) {
1103                 int flen;
1104                 struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1105
1106                 netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
1107
1108                 if (!frag_skb) {
1109                         netdev_dbg(ieee->dev,
1110                                    "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
1111                                    (fc & RTLLIB_FCTL_MOREFRAGS) != 0,
1112                                    WLAN_GET_SEQ_SEQ(sc), frag);
1113                         return -1;
1114                 }
1115                 flen = skb->len;
1116                 if (frag != 0)
1117                         flen -= hdrlen;
1118
1119                 if (frag_skb->tail + flen > frag_skb->end) {
1120                         netdev_warn(ieee->dev,
1121                                     "%s: host decrypted and reassembled frame did not fit skb\n",
1122                                     __func__);
1123                         rtllib_frag_cache_invalidate(ieee, hdr);
1124                         return -1;
1125                 }
1126
1127                 if (frag == 0) {
1128                         /* copy first fragment (including full headers) into
1129                          * beginning of the fragment cache skb
1130                          */
1131                         skb_put_data(frag_skb, skb->data, flen);
1132                 } else {
1133                         /* append frame payload to the end of the fragment
1134                          * cache skb
1135                          */
1136                         skb_put_data(frag_skb, skb->data + hdrlen, flen);
1137                 }
1138                 dev_kfree_skb_any(skb);
1139                 skb = NULL;
1140
1141                 if (fc & RTLLIB_FCTL_MOREFRAGS) {
1142                         /* more fragments expected - leave the skb in fragment
1143                          * cache for now; it will be delivered to upper layers
1144                          * after all fragments have been received
1145                          */
1146                         return -2;
1147                 }
1148
1149                 /* this was the last fragment and the frame will be
1150                  * delivered, so remove skb from fragment cache
1151                  */
1152                 skb = frag_skb;
1153                 hdr = (struct rtllib_hdr_4addr *)skb->data;
1154                 rtllib_frag_cache_invalidate(ieee, hdr);
1155         }
1156
1157         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1158          * encrypted/authenticated
1159          */
1160         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) &&
1161                 rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1162                 netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
1163                 return -1;
1164         }
1165
1166         hdr = (struct rtllib_hdr_4addr *)skb->data;
1167         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep) {
1168                 if (/*ieee->ieee802_1x &&*/
1169                     rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1170                         /* pass unencrypted EAPOL frames even if encryption is
1171                          * configured
1172                          */
1173                         struct eapol *eap = (struct eapol *)(skb->data +
1174                                 24);
1175                         netdev_dbg(ieee->dev,
1176                                    "RX: IEEE 802.1X EAPOL frame: %s\n",
1177                                    eap_get_type(eap->type));
1178                 } else {
1179                         netdev_dbg(ieee->dev,
1180                                    "encryption configured, but RX frame not encrypted (SA= %pM)\n",
1181                                    hdr->addr2);
1182                         return -1;
1183                 }
1184         }
1185
1186         if (crypt && !(fc & RTLLIB_FCTL_WEP) &&
1187             rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1188                 struct eapol *eap = (struct eapol *)(skb->data + 24);
1189
1190                 netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
1191                            eap_get_type(eap->type));
1192         }
1193
1194         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep &&
1195             !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1196                 netdev_dbg(ieee->dev,
1197                            "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
1198                            hdr->addr2);
1199                 return -1;
1200         }
1201
1202         return 0;
1203 }
1204
1205 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
1206                                       u8 nr_subframes)
1207 {
1208         if (unicast) {
1209                 if (ieee->state == RTLLIB_LINKED) {
1210                         if (((ieee->link_detect_info.NumRxUnicastOkInPeriod +
1211                             ieee->link_detect_info.NumTxOkInPeriod) > 8) ||
1212                             (ieee->link_detect_info.NumRxUnicastOkInPeriod > 2)) {
1213                                 ieee->LeisurePSLeave(ieee->dev);
1214                         }
1215                 }
1216         }
1217         ieee->last_rx_ps_time = jiffies;
1218 }
1219
1220 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1221                 struct rtllib_rx_stats *rx_stats,
1222                 struct rtllib_rxb *rxb,
1223                 u8 *dst,
1224                 u8 *src)
1225 {
1226         struct net_device *dev = ieee->dev;
1227         u16 ethertype;
1228         int i = 0;
1229
1230         if (rxb == NULL) {
1231                 netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
1232                 return;
1233         }
1234
1235         for (i = 0; i < rxb->nr_subframes; i++) {
1236                 struct sk_buff *sub_skb = rxb->subframes[i];
1237
1238                 if (sub_skb) {
1239                         /* convert hdr + possible LLC headers
1240                          * into Ethernet header
1241                          */
1242                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1243                         if (sub_skb->len >= 8 &&
1244                                 ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1245                                 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1246                                 memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1247                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
1248                                  * and replace EtherType
1249                                  */
1250                                 skb_pull(sub_skb, SNAP_SIZE);
1251                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1252                                                 src);
1253                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1254                                                 dst);
1255                         } else {
1256                                 u16 len;
1257                                 /* Leave Ethernet header part of hdr
1258                                  * and full payload
1259                                  */
1260                                 len = sub_skb->len;
1261                                 memcpy(skb_push(sub_skb, 2), &len, 2);
1262                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1263                                                 src);
1264                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1265                                                 dst);
1266                         }
1267
1268                         ieee->stats.rx_packets++;
1269                         ieee->stats.rx_bytes += sub_skb->len;
1270
1271                         if (is_multicast_ether_addr(dst))
1272                                 ieee->stats.multicast++;
1273
1274                         /* Indicate the packets to upper layer */
1275                         memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1276                         sub_skb->protocol = eth_type_trans(sub_skb, dev);
1277                         sub_skb->dev = dev;
1278                         sub_skb->dev->stats.rx_packets++;
1279                         sub_skb->dev->stats.rx_bytes += sub_skb->len;
1280                         /* 802.11 crc not sufficient */
1281                         sub_skb->ip_summed = CHECKSUM_NONE;
1282                         netif_rx(sub_skb);
1283                 }
1284         }
1285         kfree(rxb);
1286 }
1287
1288 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1289                  struct rtllib_rx_stats *rx_stats)
1290 {
1291         struct net_device *dev = ieee->dev;
1292         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1293         struct lib80211_crypt_data *crypt = NULL;
1294         struct rtllib_rxb *rxb = NULL;
1295         struct rx_ts_record *pTS = NULL;
1296         u16 fc, sc, SeqNum = 0;
1297         u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1298         u8 dst[ETH_ALEN];
1299         u8 src[ETH_ALEN];
1300         u8 bssid[ETH_ALEN] = {0};
1301
1302         size_t hdrlen = 0;
1303         bool bToOtherSTA = false;
1304         int ret = 0, i = 0;
1305
1306         fc = le16_to_cpu(hdr->frame_ctl);
1307         type = WLAN_FC_GET_TYPE(fc);
1308         stype = WLAN_FC_GET_STYPE(fc);
1309         sc = le16_to_cpu(hdr->seq_ctl);
1310
1311         /*Filter pkt not to me*/
1312         multicast = is_multicast_ether_addr(hdr->addr1);
1313         unicast = !multicast;
1314         if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1)) {
1315                 if (ieee->net_promiscuous_md)
1316                         bToOtherSTA = true;
1317                 else
1318                         goto rx_dropped;
1319         }
1320
1321         /*Filter pkt has too small length */
1322         hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1323         if (skb->len < hdrlen) {
1324                 netdev_info(dev,
1325                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1326                             __func__);
1327                 goto rx_dropped;
1328         }
1329
1330         /* Filter Duplicate pkt */
1331         ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1332         if (ret < 0)
1333                 goto rx_dropped;
1334
1335         /* Filter CTRL Frame */
1336         if (type == RTLLIB_FTYPE_CTL)
1337                 goto rx_dropped;
1338
1339         /* Filter MGNT Frame */
1340         if (type == RTLLIB_FTYPE_MGMT) {
1341                 if (bToOtherSTA)
1342                         goto rx_dropped;
1343                 if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1344                         goto rx_dropped;
1345                 else
1346                         goto rx_exit;
1347         }
1348
1349         /* Filter WAPI DATA Frame */
1350
1351         /* Update statstics for AP roaming */
1352         if (!bToOtherSTA) {
1353                 ieee->link_detect_info.NumRecvDataInPeriod++;
1354                 ieee->link_detect_info.NumRxOkInPeriod++;
1355         }
1356
1357         /* Data frame - extract src/dst addresses */
1358         rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1359
1360         /* Filter Data frames */
1361         ret = rtllib_rx_data_filter(ieee, fc, dst, src, bssid, hdr->addr2);
1362         if (ret < 0)
1363                 goto rx_dropped;
1364
1365         if (skb->len == hdrlen)
1366                 goto rx_dropped;
1367
1368         /* Send pspoll based on moredata */
1369         if ((ieee->iw_mode == IW_MODE_INFRA)  &&
1370             (ieee->sta_sleep == LPS_IS_SLEEP) &&
1371             (ieee->polling) && (!bToOtherSTA)) {
1372                 if (WLAN_FC_MORE_DATA(fc)) {
1373                         /* more data bit is set, let's request a new frame
1374                          * from the AP
1375                          */
1376                         rtllib_sta_ps_send_pspoll_frame(ieee);
1377                 } else {
1378                         ieee->polling =  false;
1379                 }
1380         }
1381
1382         /* Get crypt if encrypted */
1383         ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1384         if (ret == -1)
1385                 goto rx_dropped;
1386
1387         /* Decrypt data frame (including reassemble) */
1388         ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1389         if (ret == -1)
1390                 goto rx_dropped;
1391         else if (ret == -2)
1392                 goto rx_exit;
1393
1394         /* Get TS for Rx Reorder  */
1395         hdr = (struct rtllib_hdr_4addr *)skb->data;
1396         if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1397                 && !is_multicast_ether_addr(hdr->addr1)
1398                 && (!bToOtherSTA)) {
1399                 TID = Frame_QoSTID(skb->data);
1400                 SeqNum = WLAN_GET_SEQ_SEQ(sc);
1401                 GetTs(ieee, (struct ts_common_info **)&pTS, hdr->addr2, TID,
1402                       RX_DIR, true);
1403                 if (TID != 0 && TID != 3)
1404                         ieee->bis_any_nonbepkts = true;
1405         }
1406
1407         /* Parse rx data frame (For AMSDU) */
1408         /* skb: hdr + (possible reassembled) full plaintext payload */
1409         rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1410         if (!rxb)
1411                 goto rx_dropped;
1412
1413         /* to parse amsdu packets */
1414         /* qos data packets & reserved bit is 1 */
1415         if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1416                 /* only to free rxb, and not submit the packets
1417                  * to upper layer
1418                  */
1419                 for (i = 0; i < rxb->nr_subframes; i++)
1420                         dev_kfree_skb(rxb->subframes[i]);
1421                 kfree(rxb);
1422                 rxb = NULL;
1423                 goto rx_dropped;
1424         }
1425
1426         /* Update WAPI PN */
1427
1428         /* Check if leave LPS */
1429         if (!bToOtherSTA) {
1430                 if (ieee->bIsAggregateFrame)
1431                         nr_subframes = rxb->nr_subframes;
1432                 else
1433                         nr_subframes = 1;
1434                 if (unicast)
1435                         ieee->link_detect_info.NumRxUnicastOkInPeriod += nr_subframes;
1436                 rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1437         }
1438
1439         /* Indicate packets to upper layer or Rx Reorder */
1440         if (!ieee->ht_info->cur_rx_reorder_enable || pTS == NULL || bToOtherSTA)
1441                 rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1442         else
1443                 RxReorderIndicatePacket(ieee, rxb, pTS, SeqNum);
1444
1445         dev_kfree_skb(skb);
1446
1447  rx_exit:
1448         return 1;
1449
1450  rx_dropped:
1451         ieee->stats.rx_dropped++;
1452
1453         /* Returning 0 indicates to caller that we have not handled the SKB--
1454          * so it is still allocated and can be used again by underlying
1455          * hardware as a DMA target
1456          */
1457         return 0;
1458 }
1459
1460 static int rtllib_rx_Master(struct rtllib_device *ieee, struct sk_buff *skb,
1461                  struct rtllib_rx_stats *rx_stats)
1462 {
1463         return 0;
1464 }
1465
1466 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1467                  struct rtllib_rx_stats *rx_stats)
1468 {
1469         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1470         u16 fc = le16_to_cpu(hdr->frame_ctl);
1471         size_t hdrlen = rtllib_get_hdrlen(fc);
1472
1473         if (skb->len < hdrlen) {
1474                 netdev_info(ieee->dev,
1475                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1476                             __func__);
1477                 return 0;
1478         }
1479
1480         if (HTCCheck(ieee, skb->data)) {
1481                 if (net_ratelimit())
1482                         netdev_info(ieee->dev, "%s: Find HTCControl!\n",
1483                                     __func__);
1484                 hdrlen += 4;
1485         }
1486
1487         ieee->stats.rx_packets++;
1488         ieee->stats.rx_bytes += skb->len;
1489         rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1490
1491         return 1;
1492 }
1493
1494 static int rtllib_rx_Mesh(struct rtllib_device *ieee, struct sk_buff *skb,
1495                  struct rtllib_rx_stats *rx_stats)
1496 {
1497         return 0;
1498 }
1499
1500 /* All received frames are sent to this function. @skb contains the frame in
1501  * IEEE 802.11 format, i.e., in the format it was sent over air.
1502  * This function is called only as a tasklet (software IRQ).
1503  */
1504 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1505                  struct rtllib_rx_stats *rx_stats)
1506 {
1507         int ret = 0;
1508
1509         if (!ieee || !skb || !rx_stats) {
1510                 pr_info("%s: Input parameters NULL!\n", __func__);
1511                 goto rx_dropped;
1512         }
1513         if (skb->len < 10) {
1514                 netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
1515                 goto rx_dropped;
1516         }
1517
1518         switch (ieee->iw_mode) {
1519         case IW_MODE_ADHOC:
1520         case IW_MODE_INFRA:
1521                 ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1522                 break;
1523         case IW_MODE_MASTER:
1524         case IW_MODE_REPEAT:
1525                 ret = rtllib_rx_Master(ieee, skb, rx_stats);
1526                 break;
1527         case IW_MODE_MONITOR:
1528                 ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1529                 break;
1530         case IW_MODE_MESH:
1531                 ret = rtllib_rx_Mesh(ieee, skb, rx_stats);
1532                 break;
1533         default:
1534                 netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
1535                 break;
1536         }
1537
1538         return ret;
1539
1540  rx_dropped:
1541         if (ieee)
1542                 ieee->stats.rx_dropped++;
1543         return 0;
1544 }
1545 EXPORT_SYMBOL(rtllib_rx);
1546
1547 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1548
1549 /* Make ther structure we read from the beacon packet has the right values */
1550 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1551                                      *info_element, int sub_type)
1552 {
1553         if (info_element->elementID != QOS_ELEMENT_ID)
1554                 return -1;
1555         if (info_element->qui_subtype != sub_type)
1556                 return -1;
1557         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1558                 return -1;
1559         if (info_element->qui_type != QOS_OUI_TYPE)
1560                 return -1;
1561         if (info_element->version != QOS_VERSION_1)
1562                 return -1;
1563
1564         return 0;
1565 }
1566
1567 /* Parse a QoS parameter element */
1568 static int rtllib_read_qos_param_element(
1569                         struct rtllib_qos_parameter_info *element_param,
1570                         struct rtllib_info_element *info_element)
1571 {
1572         size_t size = sizeof(*element_param);
1573
1574         if (!element_param || !info_element || info_element->len != size - 2)
1575                 return -1;
1576
1577         memcpy(element_param, info_element, size);
1578         return rtllib_verify_qos_info(&element_param->info_element,
1579                                       QOS_OUI_PARAM_SUB_TYPE);
1580 }
1581
1582 /* Parse a QoS information element */
1583 static int rtllib_read_qos_info_element(
1584                         struct rtllib_qos_information_element *element_info,
1585                         struct rtllib_info_element *info_element)
1586 {
1587         size_t size = sizeof(*element_info);
1588
1589         if (!element_info || !info_element || info_element->len != size - 2)
1590                 return -1;
1591
1592         memcpy(element_info, info_element, size);
1593         return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
1594 }
1595
1596 /* Write QoS parameters from the ac parameters. */
1597 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1598                                                struct rtllib_qos_data *qos_data)
1599 {
1600         struct rtllib_qos_ac_parameter *ac_params;
1601         struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1602         int i;
1603         u8 aci;
1604         u8 acm;
1605
1606         qos_data->wmm_acm = 0;
1607         for (i = 0; i < QOS_QUEUE_NUM; i++) {
1608                 ac_params = &(param_elm->ac_params_record[i]);
1609
1610                 aci = (ac_params->aci_aifsn & 0x60) >> 5;
1611                 acm = (ac_params->aci_aifsn & 0x10) >> 4;
1612
1613                 if (aci >= QOS_QUEUE_NUM)
1614                         continue;
1615                 switch (aci) {
1616                 case 1:
1617                         /* BIT(0) | BIT(3) */
1618                         if (acm)
1619                                 qos_data->wmm_acm |= (0x01 << 0) | (0x01 << 3);
1620                         break;
1621                 case 2:
1622                         /* BIT(4) | BIT(5) */
1623                         if (acm)
1624                                 qos_data->wmm_acm |= (0x01 << 4) | (0x01 << 5);
1625                         break;
1626                 case 3:
1627                         /* BIT(6) | BIT(7) */
1628                         if (acm)
1629                                 qos_data->wmm_acm |= (0x01 << 6) | (0x01 << 7);
1630                         break;
1631                 case 0:
1632                 default:
1633                         /* BIT(1) | BIT(2) */
1634                         if (acm)
1635                                 qos_data->wmm_acm |= (0x01 << 1) | (0x01 << 2);
1636                         break;
1637                 }
1638
1639                 qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1640
1641                 /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1642                 qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
1643
1644                 qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
1645                                                      0x0F);
1646
1647                 qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
1648                                                       0xF0) >> 4);
1649
1650                 qos_param->flag[aci] =
1651                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1652                 qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
1653         }
1654         return 0;
1655 }
1656
1657 /* we have a generic data element which it may contain QoS information or
1658  * parameters element. check the information element length to decide
1659  * which type to read
1660  */
1661 static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
1662                                           struct rtllib_info_element
1663                                              *info_element,
1664                                           struct rtllib_network *network)
1665 {
1666         int rc = 0;
1667         struct rtllib_qos_information_element qos_info_element;
1668
1669         rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1670
1671         if (rc == 0) {
1672                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1673                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1674         } else {
1675                 struct rtllib_qos_parameter_info param_element;
1676
1677                 rc = rtllib_read_qos_param_element(&param_element,
1678                                                       info_element);
1679                 if (rc == 0) {
1680                         rtllib_qos_convert_ac_to_parameters(&param_element,
1681                                                                &(network->qos_data));
1682                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1683                         network->qos_data.param_count =
1684                             param_element.info_element.ac_info & 0x0F;
1685                 }
1686         }
1687
1688         if (rc == 0) {
1689                 netdev_dbg(ieee->dev, "QoS is supported\n");
1690                 network->qos_data.supported = 1;
1691         }
1692         return rc;
1693 }
1694
1695 static const char *get_info_element_string(u16 id)
1696 {
1697         switch (id) {
1698         case MFIE_TYPE_SSID:
1699                 return "SSID";
1700         case MFIE_TYPE_RATES:
1701                 return "RATES";
1702         case MFIE_TYPE_FH_SET:
1703                 return "FH_SET";
1704         case MFIE_TYPE_DS_SET:
1705                 return "DS_SET";
1706         case MFIE_TYPE_CF_SET:
1707                 return "CF_SET";
1708         case MFIE_TYPE_TIM:
1709                 return "TIM";
1710         case MFIE_TYPE_IBSS_SET:
1711                 return "IBSS_SET";
1712         case MFIE_TYPE_COUNTRY:
1713                 return "COUNTRY";
1714         case MFIE_TYPE_HOP_PARAMS:
1715                 return "HOP_PARAMS";
1716         case MFIE_TYPE_HOP_TABLE:
1717                 return "HOP_TABLE";
1718         case MFIE_TYPE_REQUEST:
1719                 return "REQUEST";
1720         case MFIE_TYPE_CHALLENGE:
1721                 return "CHALLENGE";
1722         case MFIE_TYPE_POWER_CONSTRAINT:
1723                 return "POWER_CONSTRAINT";
1724         case MFIE_TYPE_POWER_CAPABILITY:
1725                 return "POWER_CAPABILITY";
1726         case MFIE_TYPE_TPC_REQUEST:
1727                 return "TPC_REQUEST";
1728         case MFIE_TYPE_TPC_REPORT:
1729                 return "TPC_REPORT";
1730         case MFIE_TYPE_SUPP_CHANNELS:
1731                 return "SUPP_CHANNELS";
1732         case MFIE_TYPE_CSA:
1733                 return "CSA";
1734         case MFIE_TYPE_MEASURE_REQUEST:
1735                 return "MEASURE_REQUEST";
1736         case MFIE_TYPE_MEASURE_REPORT:
1737                 return "MEASURE_REPORT";
1738         case MFIE_TYPE_QUIET:
1739                 return "QUIET";
1740         case MFIE_TYPE_IBSS_DFS:
1741                 return "IBSS_DFS";
1742         case MFIE_TYPE_RSN:
1743                 return "RSN";
1744         case MFIE_TYPE_RATES_EX:
1745                 return "RATES_EX";
1746         case MFIE_TYPE_GENERIC:
1747                 return "GENERIC";
1748         case MFIE_TYPE_QOS_PARAMETER:
1749                 return "QOS_PARAMETER";
1750         default:
1751                 return "UNKNOWN";
1752         }
1753 }
1754
1755 static inline void rtllib_extract_country_ie(
1756         struct rtllib_device *ieee,
1757         struct rtllib_info_element *info_element,
1758         struct rtllib_network *network,
1759         u8 *addr2)
1760 {
1761         if (IS_DOT11D_ENABLE(ieee)) {
1762                 if (info_element->len != 0) {
1763                         memcpy(network->CountryIeBuf, info_element->data,
1764                                info_element->len);
1765                         network->CountryIeLen = info_element->len;
1766
1767                         if (!IS_COUNTRY_IE_VALID(ieee)) {
1768                                 if (rtllib_act_scanning(ieee, false) &&
1769                                     ieee->FirstIe_InScan)
1770                                         netdev_info(ieee->dev,
1771                                                     "Received beacon CountryIE, SSID: <%s>\n",
1772                                                     network->ssid);
1773                                 dot11d_update_country(ieee, addr2,
1774                                                        info_element->len,
1775                                                        info_element->data);
1776                         }
1777                 }
1778
1779                 if (IS_EQUAL_CIE_SRC(ieee, addr2))
1780                         UPDATE_CIE_WATCHDOG(ieee);
1781         }
1782 }
1783
1784 static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
1785                                       struct rtllib_info_element *info_element,
1786                                       struct rtllib_network *network,
1787                                       u16 *tmp_htcap_len,
1788                                       u16 *tmp_htinfo_len)
1789 {
1790         u16 ht_realtek_agg_len = 0;
1791         u8  ht_realtek_agg_buf[MAX_IE_LEN];
1792
1793         if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
1794                 return;
1795         if (info_element->len >= 4 &&
1796             info_element->data[0] == 0x00 &&
1797             info_element->data[1] == 0x50 &&
1798             info_element->data[2] == 0xf2 &&
1799             info_element->data[3] == 0x01) {
1800                 network->wpa_ie_len = min(info_element->len + 2,
1801                                           MAX_WPA_IE_LEN);
1802                 memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
1803                 return;
1804         }
1805         if (info_element->len == 7 &&
1806             info_element->data[0] == 0x00 &&
1807             info_element->data[1] == 0xe0 &&
1808             info_element->data[2] == 0x4c &&
1809             info_element->data[3] == 0x01 &&
1810             info_element->data[4] == 0x02)
1811                 network->Turbo_Enable = 1;
1812
1813         if (*tmp_htcap_len == 0) {
1814                 if (info_element->len >= 4 &&
1815                     info_element->data[0] == 0x00 &&
1816                     info_element->data[1] == 0x90 &&
1817                     info_element->data[2] == 0x4c &&
1818                     info_element->data[3] == 0x033) {
1819                         *tmp_htcap_len = min_t(u8, info_element->len,
1820                                                MAX_IE_LEN);
1821                         if (*tmp_htcap_len != 0) {
1822                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1823                                 network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1824                                                                   sizeof(network->bssht.bd_ht_cap_buf));
1825                                 memcpy(network->bssht.bd_ht_cap_buf,
1826                                        info_element->data,
1827                                        network->bssht.bd_ht_cap_len);
1828                         }
1829                 }
1830                 if (*tmp_htcap_len != 0) {
1831                         network->bssht.bd_support_ht = true;
1832                         network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
1833                 } else {
1834                         network->bssht.bd_support_ht = false;
1835                         network->bssht.bd_ht_1r = false;
1836                 }
1837         }
1838
1839         if (*tmp_htinfo_len == 0) {
1840                 if (info_element->len >= 4 &&
1841                     info_element->data[0] == 0x00 &&
1842                     info_element->data[1] == 0x90 &&
1843                     info_element->data[2] == 0x4c &&
1844                     info_element->data[3] == 0x034) {
1845                         *tmp_htinfo_len = min_t(u8, info_element->len,
1846                                                 MAX_IE_LEN);
1847                         if (*tmp_htinfo_len != 0) {
1848                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1849                                 network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
1850                                                                       sizeof(network->bssht.bd_ht_info_buf));
1851                                 memcpy(network->bssht.bd_ht_info_buf,
1852                                        info_element->data,
1853                                        network->bssht.bd_ht_info_len);
1854                         }
1855                 }
1856         }
1857
1858         if (network->bssht.bd_support_ht) {
1859                 if (info_element->len >= 4 &&
1860                     info_element->data[0] == 0x00 &&
1861                     info_element->data[1] == 0xe0 &&
1862                     info_element->data[2] == 0x4c &&
1863                     info_element->data[3] == 0x02) {
1864                         ht_realtek_agg_len = min_t(u8, info_element->len,
1865                                                    MAX_IE_LEN);
1866                         memcpy(ht_realtek_agg_buf, info_element->data,
1867                                info_element->len);
1868                 }
1869                 if (ht_realtek_agg_len >= 5) {
1870                         network->realtek_cap_exit = true;
1871                         network->bssht.bd_rt2rt_aggregation = true;
1872
1873                         if ((ht_realtek_agg_buf[4] == 1) &&
1874                             (ht_realtek_agg_buf[5] & 0x02))
1875                                 network->bssht.bd_rt2rt_long_slot_time = true;
1876
1877                         if ((ht_realtek_agg_buf[4] == 1) &&
1878                             (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1879                                 network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
1880                 }
1881         }
1882         if (ht_realtek_agg_len >= 5) {
1883                 if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1884                         network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
1885         }
1886
1887         if ((info_element->len >= 3 &&
1888              info_element->data[0] == 0x00 &&
1889              info_element->data[1] == 0x05 &&
1890              info_element->data[2] == 0xb5) ||
1891              (info_element->len >= 3 &&
1892              info_element->data[0] == 0x00 &&
1893              info_element->data[1] == 0x0a &&
1894              info_element->data[2] == 0xf7) ||
1895              (info_element->len >= 3 &&
1896              info_element->data[0] == 0x00 &&
1897              info_element->data[1] == 0x10 &&
1898              info_element->data[2] == 0x18)) {
1899                 network->broadcom_cap_exist = true;
1900         }
1901         if (info_element->len >= 3 &&
1902             info_element->data[0] == 0x00 &&
1903             info_element->data[1] == 0x0c &&
1904             info_element->data[2] == 0x43)
1905                 network->ralink_cap_exist = true;
1906         if ((info_element->len >= 3 &&
1907              info_element->data[0] == 0x00 &&
1908              info_element->data[1] == 0x03 &&
1909              info_element->data[2] == 0x7f) ||
1910              (info_element->len >= 3 &&
1911              info_element->data[0] == 0x00 &&
1912              info_element->data[1] == 0x13 &&
1913              info_element->data[2] == 0x74))
1914                 network->atheros_cap_exist = true;
1915
1916         if ((info_element->len >= 3 &&
1917              info_element->data[0] == 0x00 &&
1918              info_element->data[1] == 0x50 &&
1919              info_element->data[2] == 0x43))
1920                 network->marvell_cap_exist = true;
1921         if (info_element->len >= 3 &&
1922             info_element->data[0] == 0x00 &&
1923             info_element->data[1] == 0x40 &&
1924             info_element->data[2] == 0x96)
1925                 network->cisco_cap_exist = true;
1926
1927         if (info_element->len >= 3 &&
1928             info_element->data[0] == 0x00 &&
1929             info_element->data[1] == 0x0a &&
1930             info_element->data[2] == 0xf5)
1931                 network->airgo_cap_exist = true;
1932
1933         if (info_element->len > 4 &&
1934             info_element->data[0] == 0x00 &&
1935             info_element->data[1] == 0x40 &&
1936             info_element->data[2] == 0x96 &&
1937             info_element->data[3] == 0x01) {
1938                 if (info_element->len == 6) {
1939                         memcpy(network->CcxRmState, &info_element->data[4], 2);
1940                         if (network->CcxRmState[0] != 0)
1941                                 network->bCcxRmEnable = true;
1942                         else
1943                                 network->bCcxRmEnable = false;
1944                         network->MBssidMask = network->CcxRmState[1] & 0x07;
1945                         if (network->MBssidMask != 0) {
1946                                 network->bMBssidValid = true;
1947                                 network->MBssidMask = 0xff <<
1948                                                       (network->MBssidMask);
1949                                 ether_addr_copy(network->MBssid,
1950                                                 network->bssid);
1951                                 network->MBssid[5] &= network->MBssidMask;
1952                         } else {
1953                                 network->bMBssidValid = false;
1954                         }
1955                 } else {
1956                         network->bCcxRmEnable = false;
1957                 }
1958         }
1959         if (info_element->len > 4  &&
1960             info_element->data[0] == 0x00 &&
1961             info_element->data[1] == 0x40 &&
1962             info_element->data[2] == 0x96 &&
1963             info_element->data[3] == 0x03) {
1964                 if (info_element->len == 5) {
1965                         network->bWithCcxVerNum = true;
1966                         network->BssCcxVerNumber = info_element->data[4];
1967                 } else {
1968                         network->bWithCcxVerNum = false;
1969                         network->BssCcxVerNumber = 0;
1970                 }
1971         }
1972         if (info_element->len > 4  &&
1973             info_element->data[0] == 0x00 &&
1974             info_element->data[1] == 0x50 &&
1975             info_element->data[2] == 0xf2 &&
1976             info_element->data[3] == 0x04) {
1977                 netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
1978                            info_element->len);
1979                 network->wzc_ie_len = min(info_element->len + 2, MAX_WZC_IE_LEN);
1980                 memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
1981         }
1982 }
1983
1984 static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
1985                                      struct rtllib_network *network,
1986                                      u16 *tmp_htcap_len)
1987 {
1988         struct bss_ht *ht = &network->bssht;
1989
1990         *tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
1991         if (*tmp_htcap_len != 0) {
1992                 ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
1993                 ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1994                                        sizeof(ht->bd_ht_cap_buf));
1995                 memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);
1996
1997                 ht->bd_support_ht = true;
1998                 ht->bd_ht_1r = ((((struct ht_capab_ele *)
1999                                 ht->bd_ht_cap_buf))->MCS[1]) == 0;
2000
2001                 ht->bd_bandwidth = (enum ht_channel_width)
2002                                              (((struct ht_capab_ele *)
2003                                              (ht->bd_ht_cap_buf))->ChlWidth);
2004         } else {
2005                 ht->bd_support_ht = false;
2006                 ht->bd_ht_1r = false;
2007                 ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
2008         }
2009 }
2010
2011 int rtllib_parse_info_param(struct rtllib_device *ieee,
2012                 struct rtllib_info_element *info_element,
2013                 u16 length,
2014                 struct rtllib_network *network,
2015                 struct rtllib_rx_stats *stats)
2016 {
2017         u8 i;
2018         short offset;
2019         u16     tmp_htcap_len = 0;
2020         u16     tmp_htinfo_len = 0;
2021         char rates_str[64];
2022         char *p;
2023
2024         while (length >= sizeof(*info_element)) {
2025                 if (sizeof(*info_element) + info_element->len > length) {
2026                         netdev_dbg(ieee->dev,
2027                                    "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
2028                                    info_element->len + sizeof(*info_element),
2029                                    length, info_element->id);
2030                         /* We stop processing but don't return an error here
2031                          * because some misbehaviour APs break this rule. ie.
2032                          * Orinoco AP1000.
2033                          */
2034                         break;
2035                 }
2036
2037                 switch (info_element->id) {
2038                 case MFIE_TYPE_SSID:
2039                         if (rtllib_is_empty_essid(info_element->data,
2040                                                      info_element->len)) {
2041                                 network->flags |= NETWORK_EMPTY_ESSID;
2042                                 break;
2043                         }
2044
2045                         network->ssid_len = min(info_element->len,
2046                                                 (u8)IW_ESSID_MAX_SIZE);
2047                         memcpy(network->ssid, info_element->data,
2048                                network->ssid_len);
2049                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
2050                                 memset(network->ssid + network->ssid_len, 0,
2051                                        IW_ESSID_MAX_SIZE - network->ssid_len);
2052
2053                         netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
2054                                    network->ssid, network->ssid_len);
2055                         break;
2056
2057                 case MFIE_TYPE_RATES:
2058                         p = rates_str;
2059                         network->rates_len = min(info_element->len,
2060                                                  MAX_RATES_LENGTH);
2061                         for (i = 0; i < network->rates_len; i++) {
2062                                 network->rates[i] = info_element->data[i];
2063                                 p += scnprintf(p, sizeof(rates_str) -
2064                                               (p - rates_str), "%02X ",
2065                                               network->rates[i]);
2066                                 if (rtllib_is_ofdm_rate
2067                                     (info_element->data[i])) {
2068                                         network->flags |= NETWORK_HAS_OFDM;
2069                                         if (info_element->data[i] &
2070                                             RTLLIB_BASIC_RATE_MASK)
2071                                                 network->flags &=
2072                                                     ~NETWORK_HAS_CCK;
2073                                 }
2074
2075                                 if (rtllib_is_cck_rate
2076                                     (info_element->data[i])) {
2077                                         network->flags |= NETWORK_HAS_CCK;
2078                                 }
2079                         }
2080
2081                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
2082                                    rates_str, network->rates_len);
2083                         break;
2084
2085                 case MFIE_TYPE_RATES_EX:
2086                         p = rates_str;
2087                         network->rates_ex_len = min(info_element->len,
2088                                                     MAX_RATES_EX_LENGTH);
2089                         for (i = 0; i < network->rates_ex_len; i++) {
2090                                 network->rates_ex[i] = info_element->data[i];
2091                                 p += scnprintf(p, sizeof(rates_str) -
2092                                               (p - rates_str), "%02X ",
2093                                               network->rates_ex[i]);
2094                                 if (rtllib_is_ofdm_rate
2095                                     (info_element->data[i])) {
2096                                         network->flags |= NETWORK_HAS_OFDM;
2097                                         if (info_element->data[i] &
2098                                             RTLLIB_BASIC_RATE_MASK)
2099                                                 network->flags &=
2100                                                     ~NETWORK_HAS_CCK;
2101                                 }
2102                         }
2103
2104                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
2105                                    rates_str, network->rates_ex_len);
2106                         break;
2107
2108                 case MFIE_TYPE_DS_SET:
2109                         netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
2110                                    info_element->data[0]);
2111                         network->channel = info_element->data[0];
2112                         break;
2113
2114                 case MFIE_TYPE_FH_SET:
2115                         netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
2116                         break;
2117
2118                 case MFIE_TYPE_CF_SET:
2119                         netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
2120                         break;
2121
2122                 case MFIE_TYPE_TIM:
2123                         if (info_element->len < 4)
2124                                 break;
2125
2126                         network->tim.tim_count = info_element->data[0];
2127                         network->tim.tim_period = info_element->data[1];
2128
2129                         network->dtim_period = info_element->data[1];
2130                         if (ieee->state != RTLLIB_LINKED)
2131                                 break;
2132                         network->last_dtim_sta_time = jiffies;
2133
2134                         network->dtim_data = RTLLIB_DTIM_VALID;
2135
2136                         if (info_element->data[2] & 1)
2137                                 network->dtim_data |= RTLLIB_DTIM_MBCAST;
2138
2139                         offset = (info_element->data[2] >> 1) * 2;
2140
2141                         if (ieee->assoc_id < 8 * offset ||
2142                             ieee->assoc_id > 8 * (offset + info_element->len - 3))
2143                                 break;
2144
2145                         offset = (ieee->assoc_id / 8) - offset;
2146                         if (info_element->data[3 + offset] &
2147                            (1 << (ieee->assoc_id % 8)))
2148                                 network->dtim_data |= RTLLIB_DTIM_UCAST;
2149
2150                         network->listen_interval = network->dtim_period;
2151                         break;
2152
2153                 case MFIE_TYPE_ERP:
2154                         network->erp_value = info_element->data[0];
2155                         network->flags |= NETWORK_HAS_ERP_VALUE;
2156                         netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
2157                                    network->erp_value);
2158                         break;
2159                 case MFIE_TYPE_IBSS_SET:
2160                         network->atim_window = info_element->data[0];
2161                         netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
2162                                    network->atim_window);
2163                         break;
2164
2165                 case MFIE_TYPE_CHALLENGE:
2166                         netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
2167                         break;
2168
2169                 case MFIE_TYPE_GENERIC:
2170                         netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
2171                                    info_element->len);
2172
2173                         rtllib_parse_mife_generic(ieee, info_element, network,
2174                                                   &tmp_htcap_len,
2175                                                   &tmp_htinfo_len);
2176                         break;
2177
2178                 case MFIE_TYPE_RSN:
2179                         netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
2180                                    info_element->len);
2181                         network->rsn_ie_len = min(info_element->len + 2,
2182                                                   MAX_WPA_IE_LEN);
2183                         memcpy(network->rsn_ie, info_element,
2184                                network->rsn_ie_len);
2185                         break;
2186
2187                 case MFIE_TYPE_HT_CAP:
2188                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
2189                                    info_element->len);
2190
2191                         rtllib_parse_mfie_ht_cap(info_element, network,
2192                                                  &tmp_htcap_len);
2193                         break;
2194
2195                 case MFIE_TYPE_HT_INFO:
2196                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
2197                                    info_element->len);
2198                         tmp_htinfo_len = min_t(u8, info_element->len,
2199                                                MAX_IE_LEN);
2200                         if (tmp_htinfo_len) {
2201                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
2202                                 network->bssht.bd_ht_info_len = tmp_htinfo_len >
2203                                         sizeof(network->bssht.bd_ht_info_buf) ?
2204                                         sizeof(network->bssht.bd_ht_info_buf) :
2205                                         tmp_htinfo_len;
2206                                 memcpy(network->bssht.bd_ht_info_buf,
2207                                        info_element->data,
2208                                        network->bssht.bd_ht_info_len);
2209                         }
2210                         break;
2211
2212                 case MFIE_TYPE_AIRONET:
2213                         netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
2214                                    info_element->len);
2215                         if (info_element->len > IE_CISCO_FLAG_POSITION) {
2216                                 network->bWithAironetIE = true;
2217
2218                                 if ((info_element->data[IE_CISCO_FLAG_POSITION]
2219                                      & SUPPORT_CKIP_MIC) ||
2220                                      (info_element->data[IE_CISCO_FLAG_POSITION]
2221                                      & SUPPORT_CKIP_PK))
2222                                         network->bCkipSupported = true;
2223                                 else
2224                                         network->bCkipSupported = false;
2225                         } else {
2226                                 network->bWithAironetIE = false;
2227                                 network->bCkipSupported = false;
2228                         }
2229                         break;
2230                 case MFIE_TYPE_QOS_PARAMETER:
2231                         netdev_err(ieee->dev,
2232                                    "QoS Error need to parse QOS_PARAMETER IE\n");
2233                         break;
2234
2235                 case MFIE_TYPE_COUNTRY:
2236                         netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
2237                                    info_element->len);
2238                         rtllib_extract_country_ie(ieee, info_element, network,
2239                                                   network->bssid);
2240                         break;
2241 /* TODO */
2242                 default:
2243                         netdev_dbg(ieee->dev,
2244                                    "Unsupported info element: %s (%d)\n",
2245                                    get_info_element_string(info_element->id),
2246                                    info_element->id);
2247                         break;
2248                 }
2249
2250                 length -= sizeof(*info_element) + info_element->len;
2251                 info_element =
2252                     (struct rtllib_info_element *)&info_element->data[info_element->len];
2253         }
2254
2255         if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2256             !network->cisco_cap_exist && !network->ralink_cap_exist &&
2257             !network->bssht.bd_rt2rt_aggregation)
2258                 network->unknown_cap_exist = true;
2259         else
2260                 network->unknown_cap_exist = false;
2261         return 0;
2262 }
2263
2264 static long rtllib_translate_todbm(u8 signal_strength_index)
2265 {
2266         long    signal_power;
2267
2268         signal_power = (long)((signal_strength_index + 1) >> 1);
2269         signal_power -= 95;
2270
2271         return signal_power;
2272 }
2273
2274 static inline int rtllib_network_init(
2275         struct rtllib_device *ieee,
2276         struct rtllib_probe_response *beacon,
2277         struct rtllib_network *network,
2278         struct rtllib_rx_stats *stats)
2279 {
2280         memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2281
2282         /* Pull out fixed field data */
2283         ether_addr_copy(network->bssid, beacon->header.addr3);
2284         network->capability = le16_to_cpu(beacon->capability);
2285         network->last_scanned = jiffies;
2286         network->time_stamp[0] = beacon->time_stamp[0];
2287         network->time_stamp[1] = beacon->time_stamp[1];
2288         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
2289         /* Where to pull this? beacon->listen_interval;*/
2290         network->listen_interval = 0x0A;
2291         network->rates_len = network->rates_ex_len = 0;
2292         network->ssid_len = 0;
2293         network->hidden_ssid_len = 0;
2294         memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2295         network->flags = 0;
2296         network->atim_window = 0;
2297         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2298             0x3 : 0x0;
2299         network->berp_info_valid = false;
2300         network->broadcom_cap_exist = false;
2301         network->ralink_cap_exist = false;
2302         network->atheros_cap_exist = false;
2303         network->cisco_cap_exist = false;
2304         network->unknown_cap_exist = false;
2305         network->realtek_cap_exit = false;
2306         network->marvell_cap_exist = false;
2307         network->airgo_cap_exist = false;
2308         network->Turbo_Enable = 0;
2309         network->SignalStrength = stats->SignalStrength;
2310         network->RSSI = stats->SignalStrength;
2311         network->CountryIeLen = 0;
2312         memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2313         HTInitializeBssDesc(&network->bssht);
2314         if (stats->freq == RTLLIB_52GHZ_BAND) {
2315                 /* for A band (No DS info) */
2316                 network->channel = stats->received_channel;
2317         } else
2318                 network->flags |= NETWORK_HAS_CCK;
2319
2320         network->wpa_ie_len = 0;
2321         network->rsn_ie_len = 0;
2322         network->wzc_ie_len = 0;
2323
2324         if (rtllib_parse_info_param(ieee,
2325                         beacon->info_element,
2326                         (stats->len - sizeof(*beacon)),
2327                         network,
2328                         stats))
2329                 return 1;
2330
2331         network->mode = 0;
2332         if (stats->freq == RTLLIB_52GHZ_BAND)
2333                 network->mode = IEEE_A;
2334         else {
2335                 if (network->flags & NETWORK_HAS_OFDM)
2336                         network->mode |= IEEE_G;
2337                 if (network->flags & NETWORK_HAS_CCK)
2338                         network->mode |= IEEE_B;
2339         }
2340
2341         if (network->mode == 0) {
2342                 netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
2343                            escape_essid(network->ssid, network->ssid_len),
2344                            network->bssid);
2345                 return 1;
2346         }
2347
2348         if (network->bssht.bd_support_ht) {
2349                 if (network->mode == IEEE_A)
2350                         network->mode = IEEE_N_5G;
2351                 else if (network->mode & (IEEE_G | IEEE_B))
2352                         network->mode = IEEE_N_24G;
2353         }
2354         if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2355                 network->flags |= NETWORK_EMPTY_ESSID;
2356         stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2357         stats->noise = rtllib_translate_todbm((u8)(100 - stats->signal)) - 25;
2358
2359         memcpy(&network->stats, stats, sizeof(network->stats));
2360
2361         return 0;
2362 }
2363
2364 static inline int is_same_network(struct rtllib_network *src,
2365                                   struct rtllib_network *dst, u8 ssidbroad)
2366 {
2367         /* A network is only a duplicate if the channel, BSSID, ESSID
2368          * and the capability field (in particular IBSS and BSS) all match.
2369          * We treat all <hidden> with the same BSSID and channel
2370          * as one network
2371          */
2372         return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2373                 (src->channel == dst->channel) &&
2374                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2375                 (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2376                 (!ssidbroad)) &&
2377                 ((src->capability & WLAN_CAPABILITY_IBSS) ==
2378                 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2379                 ((src->capability & WLAN_CAPABILITY_ESS) ==
2380                 (dst->capability & WLAN_CAPABILITY_ESS)));
2381 }
2382
2383 static inline void update_network(struct rtllib_device *ieee,
2384                                   struct rtllib_network *dst,
2385                                   struct rtllib_network *src)
2386 {
2387         int qos_active;
2388         u8 old_param;
2389
2390         memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2391         dst->capability = src->capability;
2392         memcpy(dst->rates, src->rates, src->rates_len);
2393         dst->rates_len = src->rates_len;
2394         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2395         dst->rates_ex_len = src->rates_ex_len;
2396         if (src->ssid_len > 0) {
2397                 if (dst->ssid_len == 0) {
2398                         memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2399                         dst->hidden_ssid_len = src->ssid_len;
2400                         memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2401                 } else {
2402                         memset(dst->ssid, 0, dst->ssid_len);
2403                         dst->ssid_len = src->ssid_len;
2404                         memcpy(dst->ssid, src->ssid, src->ssid_len);
2405                 }
2406         }
2407         dst->mode = src->mode;
2408         dst->flags = src->flags;
2409         dst->time_stamp[0] = src->time_stamp[0];
2410         dst->time_stamp[1] = src->time_stamp[1];
2411         if (src->flags & NETWORK_HAS_ERP_VALUE) {
2412                 dst->erp_value = src->erp_value;
2413                 dst->berp_info_valid = src->berp_info_valid = true;
2414         }
2415         dst->beacon_interval = src->beacon_interval;
2416         dst->listen_interval = src->listen_interval;
2417         dst->atim_window = src->atim_window;
2418         dst->dtim_period = src->dtim_period;
2419         dst->dtim_data = src->dtim_data;
2420         dst->last_dtim_sta_time = src->last_dtim_sta_time;
2421         memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2422
2423         dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
2424         dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
2425         dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
2426         memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
2427                src->bssht.bd_ht_cap_len);
2428         dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
2429         memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
2430                src->bssht.bd_ht_info_len);
2431         dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
2432         dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
2433         dst->broadcom_cap_exist = src->broadcom_cap_exist;
2434         dst->ralink_cap_exist = src->ralink_cap_exist;
2435         dst->atheros_cap_exist = src->atheros_cap_exist;
2436         dst->realtek_cap_exit = src->realtek_cap_exit;
2437         dst->marvell_cap_exist = src->marvell_cap_exist;
2438         dst->cisco_cap_exist = src->cisco_cap_exist;
2439         dst->airgo_cap_exist = src->airgo_cap_exist;
2440         dst->unknown_cap_exist = src->unknown_cap_exist;
2441         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2442         dst->wpa_ie_len = src->wpa_ie_len;
2443         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2444         dst->rsn_ie_len = src->rsn_ie_len;
2445         memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2446         dst->wzc_ie_len = src->wzc_ie_len;
2447
2448         dst->last_scanned = jiffies;
2449         /* qos related parameters */
2450         qos_active = dst->qos_data.active;
2451         old_param = dst->qos_data.param_count;
2452         dst->qos_data.supported = src->qos_data.supported;
2453         if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2454                 memcpy(&dst->qos_data, &src->qos_data,
2455                        sizeof(struct rtllib_qos_data));
2456         if (dst->qos_data.supported == 1) {
2457                 if (dst->ssid_len)
2458                         netdev_dbg(ieee->dev,
2459                                    "QoS the network %s is QoS supported\n",
2460                                    dst->ssid);
2461                 else
2462                         netdev_dbg(ieee->dev,
2463                                    "QoS the network is QoS supported\n");
2464         }
2465         dst->qos_data.active = qos_active;
2466         dst->qos_data.old_param_count = old_param;
2467
2468         dst->wmm_info = src->wmm_info;
2469         if (src->wmm_param[0].ac_aci_acm_aifsn ||
2470            src->wmm_param[1].ac_aci_acm_aifsn ||
2471            src->wmm_param[2].ac_aci_acm_aifsn ||
2472            src->wmm_param[3].ac_aci_acm_aifsn)
2473                 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2474
2475         dst->SignalStrength = src->SignalStrength;
2476         dst->RSSI = src->RSSI;
2477         dst->Turbo_Enable = src->Turbo_Enable;
2478
2479         dst->CountryIeLen = src->CountryIeLen;
2480         memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2481
2482         dst->bWithAironetIE = src->bWithAironetIE;
2483         dst->bCkipSupported = src->bCkipSupported;
2484         memcpy(dst->CcxRmState, src->CcxRmState, 2);
2485         dst->bCcxRmEnable = src->bCcxRmEnable;
2486         dst->MBssidMask = src->MBssidMask;
2487         dst->bMBssidValid = src->bMBssidValid;
2488         memcpy(dst->MBssid, src->MBssid, 6);
2489         dst->bWithCcxVerNum = src->bWithCcxVerNum;
2490         dst->BssCcxVerNumber = src->BssCcxVerNumber;
2491 }
2492
2493 static inline int is_beacon(u16 fc)
2494 {
2495         return (WLAN_FC_GET_STYPE(fc) == RTLLIB_STYPE_BEACON);
2496 }
2497
2498 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2499 {
2500         if (channel > MAX_CHANNEL_NUMBER) {
2501                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2502                 return 0;
2503         }
2504
2505         if (rtllib->active_channel_map[channel] == 2)
2506                 return 1;
2507
2508         return 0;
2509 }
2510
2511 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2512 {
2513         if (channel > MAX_CHANNEL_NUMBER) {
2514                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2515                 return 0;
2516         }
2517         if (rtllib->active_channel_map[channel] > 0)
2518                 return 1;
2519
2520         return 0;
2521 }
2522 EXPORT_SYMBOL(rtllib_legal_channel);
2523
2524 static inline void rtllib_process_probe_response(
2525         struct rtllib_device *ieee,
2526         struct rtllib_probe_response *beacon,
2527         struct rtllib_rx_stats *stats)
2528 {
2529         struct rtllib_network *target;
2530         struct rtllib_network *oldest = NULL;
2531         struct rtllib_info_element *info_element = &beacon->info_element[0];
2532         unsigned long flags;
2533         short renew;
2534         struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2535                                                  GFP_ATOMIC);
2536         u16 frame_ctl = le16_to_cpu(beacon->header.frame_ctl);
2537
2538         if (!network)
2539                 return;
2540
2541         netdev_dbg(ieee->dev,
2542                    "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2543                    escape_essid(info_element->data, info_element->len),
2544                    beacon->header.addr3,
2545                    (le16_to_cpu(beacon->capability) & (1 << 0xf)) ? '1' : '0',
2546                    (le16_to_cpu(beacon->capability) & (1 << 0xe)) ? '1' : '0',
2547                    (le16_to_cpu(beacon->capability) & (1 << 0xd)) ? '1' : '0',
2548                    (le16_to_cpu(beacon->capability) & (1 << 0xc)) ? '1' : '0',
2549                    (le16_to_cpu(beacon->capability) & (1 << 0xb)) ? '1' : '0',
2550                    (le16_to_cpu(beacon->capability) & (1 << 0xa)) ? '1' : '0',
2551                    (le16_to_cpu(beacon->capability) & (1 << 0x9)) ? '1' : '0',
2552                    (le16_to_cpu(beacon->capability) & (1 << 0x8)) ? '1' : '0',
2553                    (le16_to_cpu(beacon->capability) & (1 << 0x7)) ? '1' : '0',
2554                    (le16_to_cpu(beacon->capability) & (1 << 0x6)) ? '1' : '0',
2555                    (le16_to_cpu(beacon->capability) & (1 << 0x5)) ? '1' : '0',
2556                    (le16_to_cpu(beacon->capability) & (1 << 0x4)) ? '1' : '0',
2557                    (le16_to_cpu(beacon->capability) & (1 << 0x3)) ? '1' : '0',
2558                    (le16_to_cpu(beacon->capability) & (1 << 0x2)) ? '1' : '0',
2559                    (le16_to_cpu(beacon->capability) & (1 << 0x1)) ? '1' : '0',
2560                    (le16_to_cpu(beacon->capability) & (1 << 0x0)) ? '1' : '0');
2561
2562         if (rtllib_network_init(ieee, beacon, network, stats)) {
2563                 netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
2564                            escape_essid(info_element->data, info_element->len),
2565                            beacon->header.addr3,
2566                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2567                 goto free_network;
2568         }
2569
2570         if (!rtllib_legal_channel(ieee, network->channel))
2571                 goto free_network;
2572
2573         if (WLAN_FC_GET_STYPE(frame_ctl) == RTLLIB_STYPE_PROBE_RESP) {
2574                 if (IsPassiveChannel(ieee, network->channel)) {
2575                         netdev_info(ieee->dev,
2576                                     "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
2577                                     network->channel);
2578                         goto free_network;
2579                 }
2580         }
2581
2582         /* The network parsed correctly -- so now we scan our known networks
2583          * to see if we can find it in our list.
2584          *
2585          * NOTE:  This search is definitely not optimized.  Once its doing
2586          *      the "right thing" we'll optimize it for efficiency if
2587          *      necessary
2588          */
2589
2590         /* Search for this entry in the list and update it if it is
2591          * already there.
2592          */
2593
2594         spin_lock_irqsave(&ieee->lock, flags);
2595         if (is_same_network(&ieee->current_network, network,
2596            (network->ssid_len ? 1 : 0))) {
2597                 update_network(ieee, &ieee->current_network, network);
2598                 if ((ieee->current_network.mode == IEEE_N_24G ||
2599                      ieee->current_network.mode == IEEE_G) &&
2600                     ieee->current_network.berp_info_valid) {
2601                         if (ieee->current_network.erp_value & ERP_UseProtection)
2602                                 ieee->current_network.buseprotection = true;
2603                         else
2604                                 ieee->current_network.buseprotection = false;
2605                 }
2606                 if (is_beacon(frame_ctl)) {
2607                         if (ieee->state >= RTLLIB_LINKED)
2608                                 ieee->link_detect_info.NumRecvBcnInPeriod++;
2609                 }
2610         }
2611         list_for_each_entry(target, &ieee->network_list, list) {
2612                 if (is_same_network(target, network,
2613                    (target->ssid_len ? 1 : 0)))
2614                         break;
2615                 if ((oldest == NULL) ||
2616                     (target->last_scanned < oldest->last_scanned))
2617                         oldest = target;
2618         }
2619
2620         /* If we didn't find a match, then get a new network slot to initialize
2621          * with this beacon's information
2622          */
2623         if (&target->list == &ieee->network_list) {
2624                 if (list_empty(&ieee->network_free_list)) {
2625                         /* If there are no more slots, expire the oldest */
2626                         list_del(&oldest->list);
2627                         target = oldest;
2628                         netdev_dbg(ieee->dev,
2629                                    "Expired '%s' ( %pM) from network list.\n",
2630                                    escape_essid(target->ssid, target->ssid_len),
2631                                    target->bssid);
2632                 } else {
2633                         /* Otherwise just pull from the free list */
2634                         target = list_entry(ieee->network_free_list.next,
2635                                             struct rtllib_network, list);
2636                         list_del(ieee->network_free_list.next);
2637                 }
2638
2639                 netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
2640                            escape_essid(network->ssid, network->ssid_len),
2641                            network->bssid,
2642                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2643
2644                 memcpy(target, network, sizeof(*target));
2645                 list_add_tail(&target->list, &ieee->network_list);
2646                 if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2647                         rtllib_softmac_new_net(ieee, network);
2648         } else {
2649                 netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
2650                            escape_essid(target->ssid, target->ssid_len),
2651                            target->bssid,
2652                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2653
2654                 /* we have an entry and we are going to update it. But this
2655                  *  entry may be already expired. In this case we do the same
2656                  * as we found a new net and call the new_net handler
2657                  */
2658                 renew = !time_after(target->last_scanned + ieee->scan_age,
2659                                     jiffies);
2660                 if ((!target->ssid_len) &&
2661                     (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2662                     || ((ieee->current_network.ssid_len == network->ssid_len) &&
2663                     (strncmp(ieee->current_network.ssid, network->ssid,
2664                     network->ssid_len) == 0) &&
2665                     (ieee->state == RTLLIB_NOLINK))))
2666                         renew = 1;
2667                 update_network(ieee, target, network);
2668                 if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2669                         rtllib_softmac_new_net(ieee, network);
2670         }
2671
2672         spin_unlock_irqrestore(&ieee->lock, flags);
2673         if (is_beacon(frame_ctl) &&
2674             is_same_network(&ieee->current_network, network,
2675             (network->ssid_len ? 1 : 0)) &&
2676             (ieee->state == RTLLIB_LINKED)) {
2677                 ieee->handle_beacon(ieee->dev, beacon, &ieee->current_network);
2678         }
2679 free_network:
2680         kfree(network);
2681 }
2682
2683 static void rtllib_rx_mgt(struct rtllib_device *ieee,
2684                           struct sk_buff *skb,
2685                           struct rtllib_rx_stats *stats)
2686 {
2687         struct rtllib_hdr_4addr *header = (struct rtllib_hdr_4addr *)skb->data;
2688
2689         if ((WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2690             RTLLIB_STYPE_PROBE_RESP) &&
2691             (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2692             RTLLIB_STYPE_BEACON))
2693                 ieee->last_rx_ps_time = jiffies;
2694
2695         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
2696         case RTLLIB_STYPE_BEACON:
2697                 netdev_dbg(ieee->dev, "received BEACON (%d)\n",
2698                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2699                 rtllib_process_probe_response(
2700                                 ieee, (struct rtllib_probe_response *)header,
2701                                 stats);
2702
2703                 if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2704                     ieee->iw_mode == IW_MODE_INFRA &&
2705                     ieee->state == RTLLIB_LINKED))
2706                         schedule_work(&ieee->ps_task);
2707
2708                 break;
2709
2710         case RTLLIB_STYPE_PROBE_RESP:
2711                 netdev_dbg(ieee->dev, "received PROBE RESPONSE (%d)\n",
2712                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2713                 rtllib_process_probe_response(ieee,
2714                               (struct rtllib_probe_response *)header, stats);
2715                 break;
2716         case RTLLIB_STYPE_PROBE_REQ:
2717                 netdev_dbg(ieee->dev, "received PROBE REQUEST (%d)\n",
2718                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2719                 if ((ieee->softmac_features & IEEE_SOFTMAC_PROBERS) &&
2720                     ((ieee->iw_mode == IW_MODE_ADHOC ||
2721                     ieee->iw_mode == IW_MODE_MASTER) &&
2722                     ieee->state == RTLLIB_LINKED))
2723                         rtllib_rx_probe_rq(ieee, skb);
2724                 break;
2725         }
2726 }